WO2017201743A1 - 传输方法、基站和终端 - Google Patents
传输方法、基站和终端 Download PDFInfo
- Publication number
- WO2017201743A1 WO2017201743A1 PCT/CN2016/083704 CN2016083704W WO2017201743A1 WO 2017201743 A1 WO2017201743 A1 WO 2017201743A1 CN 2016083704 W CN2016083704 W CN 2016083704W WO 2017201743 A1 WO2017201743 A1 WO 2017201743A1
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- WIPO (PCT)
- Prior art keywords
- base station
- terminal
- source base
- status report
- sequence number
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/249—Reselection being triggered by specific parameters according to timing information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/08—Upper layer protocols
Definitions
- Embodiments of the present invention relate to the field of communications, and, more particularly, to a transmission method, a base station, and a terminal.
- the user equipment remains connected to the base station, thereby enabling communication between the various user equipments.
- LTE Long Term Evolution
- LTE-A Enhanced Long Term Evolution
- UE User Equipment
- the communication is maintained with an evolved base station (Evolutional Node B, simply "eNB or e-NodeB").
- the handover procedure may be triggered when the UE will move out of the coverage of the evolved base station, or the evolved base station cannot ensure that the service or quality of service is reduced to the UE.
- the evolved base station before handover may be referred to as a source base station, and the base station after handover may be referred to as a target base station.
- the first mode is that when the source base station decides to perform the handover, the transmission of the uplink and downlink user data with the UE is stopped. Until the handover is completed, the target base station starts to transmit user data with the UE. Therefore, during the handover process, the transmission of the user data is interrupted between the UE and the base station, and the transmission of the user data is resumed until the target base station is accessed.
- the method reduces the user experience of the delay-sensitive service, thereby limiting the application of the delay-sensitive service on the LTE system.
- the second way is that during the handover process, the UE still maintains the transmission of user data with the source base station. After the UE successfully switches to the target base station, the UE disconnects from the source base station to reduce or avoid interruption of user data transmission caused by the handover process.
- the prior art lacks a specific mechanism, which can improve the effectiveness of user data transmission between the UE and the base station in the handover process, thereby improving the user experience.
- the handover process of the embodiment of the present invention can be applied to a single carrier scenario, a cell aggregation scenario in a base station, and a dual connectivity scenario.
- a single carrier scenario as an example, when a handover occurs, the terminal and a service The cell remains connected.
- taking a dual connectivity scenario as an example when a handover occurs, the terminal is connected to at least two base stations.
- the cell aggregation scenario in the base station as an example, when the handover occurs, the terminal is connected to at least two cells under the same base station.
- the embodiment of the invention relates to a transmission method for handover between base stations, and is also applicable to a transmission method for handover within a base station.
- the difference is that the transmission method of intra-base station handover does not involve the source base station and the target base station, but the handover between different cells under the same base station.
- the transmission method of intra-base station handover may further omit the signaling interaction between the source base station and the target base station, and thus the system overhead is further saved.
- the source base station can maintain transmission of user data with the terminal.
- the user data transmission may be, for example, transmission of uplink user data sent by the terminal to the source base station (hereinafter referred to as uplink transmission), and/or transmission of downlink user data transmitted by the source base station to the terminal (hereinafter referred to as downlink transmission).
- uplink transmission transmission of uplink user data sent by the terminal to the source base station
- downlink transmission transmission of downlink user data transmitted by the source base station to the terminal
- the above-mentioned transmission of maintaining user data can be understood as that during the handover, the source base station and the terminal have user data transmission for a period of time, and after the time period, the base station and the terminal stop transmission of user data.
- the source base station when the transmission of the user data between the source base station and the terminal is changed from being maintained to being stopped, the source base station sends a first status report to the terminal, where the first status report is used to indicate to the terminal that the source base station uplinks to the terminal. The status of data reception.
- the terminal when the terminal disconnects or is about to disconnect the source base station, the terminal sends a second status report to the source base station, where the second status report is used to indicate to the source base station, the downlink data receiving status of the terminal.
- the embodiment of the invention provides a transmission method, a base station and a terminal, which can effectively improve the transmission efficiency of user data.
- the first aspect provides a transmission method, the method comprising:
- the source base station sends a handover command to the terminal, which is used to trigger a handover process of the terminal from the source base station to the target base station, and the source base station maintains transmission of user data with the terminal;
- the source base station when the transmission of the user data between the source base station and the terminal is changed from being maintained to being stopped, the source base station sends a first status report to the terminal, where the first status report is used to indicate to the terminal that the source base station uplink data to the terminal. Receiving status.
- the method further includes:
- the source base station receives the access indication sent by the target base station, and is used to indicate that the terminal successfully accesses the target base station;
- the source base station when the source base station stops the transmission of the user data with the terminal, the source base station sends the first status report to the terminal, which specifically includes:
- the source base station when the source base station receives the access indication sent by the target base station, the source base station sends a first status report to the terminal.
- the method further includes:
- the source base station receives the handover indication sent by the terminal, and is used to indicate that the terminal disconnects or is about to disconnect from the source base station;
- the source base station sends a first status report to the terminal, which specifically includes:
- the source base station when the source base station receives the handover indication sent by the terminal, the source base station sends a first status report to the terminal.
- the source base station sends a first status report to the terminal in time, and the terminal can know which uplink data has been learned earlier according to the received first status report.
- the source base station successfully receives, so the terminal does not send the same uplink data to the target base station, which improves the transmission efficiency of the uplink data.
- the method further includes:
- the source base station receives the second status report sent by the terminal, and the second status report is used to indicate to the source base station, the receiving status of the downlink data of the terminal.
- the method further includes:
- the source base station sends the sequence number status transmission information to the target base station, and is used to indicate to the target base station, the status of obtaining the uplink data of the terminal by the source base station;
- the source base station forwards the uplink data of the acquired terminal to the target base station.
- the second status report sent by the source base station receiving terminal, the serial number status transmission information is further used to indicate to the target base station, The transmission status of the downlink data of the terminal by the source base station.
- the source base station may more accurately indicate the transmission status of the downlink data of the terminal by the source base station to the target base station. Thereafter, the downlink data forwarded by the target base station to the terminal does not include the downlink data of the source base station that the terminal has successfully received, thereby The transmission efficiency of downlink data can be further improved.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the RLC status report indicates: a sequence number of the next unreceived uplink data of the source base station and all the previous numbers before the sequence number The serial number of the received uplink data; or,
- the PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the foregoing transmission method can effectively improve the transmission efficiency of user data, reduce the processing load of the base station, and reduce the signaling overhead of the system.
- the second aspect provides a transmission method, the method comprising:
- the terminal triggers a handover process from the source base station to the target base station based on the handover command, and the source base station maintains transmission of user data with the terminal;
- the terminal receives the first status report sent by the source base station, and the first status report is used to indicate to the terminal that the source base station uplinks to the terminal. The status of data reception.
- the terminal when the source base station stops the transmission of the user data with the terminal, the terminal receives the first status report sent by the source base station, specifically including :
- the terminal receives the first status report sent by the source base station;
- the access indication is used to indicate to the source base station that the terminal successfully accesses the target base station.
- the method further includes:
- the terminal sends a handover indication to the source base station to indicate that the terminal disconnects or is about to disconnect from the source base station;
- the terminal receives the first status report sent by the source base station, which specifically includes:
- the terminal receives the first status report sent by the source base station based on the handover indication sent by the terminal.
- the method further includes:
- the terminal sends a second status report to the source base station, where the second status report is used to indicate to the source base station, the receiving status of the downlink data of the terminal.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the RLC status report indicates:
- the PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the source base station sends a first status report to the terminal in time, and the terminal can know which uplink data has been sourced earlier according to the received first status report.
- the base station successfully receives, so the terminal no longer sends the target base station Sending the same uplink data improves the transmission efficiency of the uplink data.
- the source base station can more accurately indicate the transmission status of the downlink data of the source base station to the target base station to the target base station.
- the downlink data forwarded by the target base station to the terminal does not include the downlink data of the source base station that the terminal has successfully received, so that the transmission efficiency of the downlink data can be further improved.
- the foregoing transmission method can effectively improve the transmission efficiency of user data, reduce the processing load of the base station, and reduce the signaling overhead of the system.
- the third aspect provides a base station, where the base station includes:
- a sending unit configured to send a handover command to the terminal, to trigger a handover process of the terminal from the base station to the target base station;
- a processing unit configured to maintain transmission of user data between the base station and the terminal
- the sending unit is further configured to: when the transmission of the user data between the base station and the terminal is changed from being maintained to being stopped, in the switching process, sending a first status report to the terminal, where the first status report is used to indicate to the terminal, the base station is to the terminal The receiving status of the uplink data.
- the base station further includes:
- a receiving unit configured to receive an access indication sent by the target base station, to indicate that the terminal successfully accesses the target base station;
- the sending unit specifically includes:
- the receiving unit when the receiving unit receives the access indication sent by the target base station, the first status report is sent to the terminal.
- the base station further includes:
- a receiving unit configured to receive, by the terminal, a handover indication sent by the terminal, to indicate that the terminal disconnects or is about to disconnect from the base station;
- the sending unit specifically includes:
- the receiving unit receives the handover indication sent by the terminal, the first status report is sent to the terminal.
- the receiving unit after the receiving unit receives the handover indication sent by the terminal, the receiving unit is further configured to:
- the sending unit after the sending unit sends the first status report to the terminal, the sending unit is further configured to:
- the receiving, by the receiving unit, the second status report sent by the terminal, the serial number status transmission information is further used to indicate to the target base station, The transmission status of the downlink data of the terminal by the base station.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the RLC status report indicates:
- the PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the transmission efficiency of the user data can be effectively improved, the processing load of the base station is reduced, and the signaling overhead of the system is reduced.
- the fourth aspect provides a terminal, where the terminal includes:
- a receiving unit configured to receive a handover command sent by the source base station
- a processing unit configured to trigger a handover process from the source base station to the target base station based on the handover command, and maintain transmission of user data with the source base station;
- the receiving unit is further configured to: when the transmission of the user data between the source base station and the terminal is changed from being maintained to being stopped, in the handover process, receiving a first status report sent by the source base station, where the first status report is used to indicate to the terminal, the source The receiving status of the uplink data of the terminal by the base station.
- the receiving unit when the transmission of the user data between the source base station and the terminal is changed from being maintained to being stopped, the receiving unit is specifically configured to:
- the source base station receives the access indication sent by the target base station, receiving the first status report sent by the source base station;
- the access indication is used to indicate to the source base station that the terminal successfully accesses the target base station.
- the method further includes: a sending unit, configured to send, to the source base station, a handover indication, to indicate that the terminal is disconnected or The connection to the source base station will be disconnected;
- the terminal receives the first status report sent by the source base station, and the receiving unit is specifically configured to:
- the first status report sent by the source base station based on the handover indication is received.
- the sending unit after the sending unit sends the switching indication to the source base station, the sending unit is further configured to:
- the source base station sends a second status report, where the second status report is used to indicate to the source base station, the receiving status of the downlink data of the terminal.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the RLC status report indicates:
- the PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the transmission efficiency of the user data can be effectively improved, the processing load of the base station is reduced, and the signaling overhead of the system is reduced.
- a fifth aspect provides a transmission method, the method comprising:
- the source base station sends a handover command to the terminal, and is used to trigger a handover process of the terminal from the source base station to the target base station;
- the source base station Based on the foregoing handover command, the source base station sends sequence number state transmission information to the target base station, indicating a start number of downlink data to be allocated for the target base station.
- the target base station sends the downlink data acquired from the serving gateway to the terminal according to the foregoing sequence number state transmission information.
- the source base station forwards downlink data to the target base station, where the target base station sends the data to the terminal.
- the above downlink data after the terminal successfully accesses the target base station, the source base station forwards downlink data to the target base station, where the target base station sends the data to the terminal.
- the source base station after the source base station sends the foregoing handover command to the terminal, the source base station immediately sends the sequence number state transmission information to the target base station; Or, before the terminal triggers random access to the target base station, the source base station sends the serial number status transmission information to the target base station.
- the foregoing serial number state transmission information may be at least one of the following manners:
- the target base station may select, according to the number of the last downlink data, the number of the downlink data that the target base station sends to the terminal for the first time.
- the source base station after the terminal successfully accesses the target base station, the source base station sends, to the target base station, the last one that the source base station actually sends to the terminal. The number of the downlink data.
- the terminal can receive the downlink data sent by the serving gateway through the source base station and the target base station, thereby improving the transmission performance during handover, and further improving the user experience.
- a sixth aspect provides a base station, where the base station includes:
- a sending unit configured to send a handover command to the terminal, to trigger a handover process of the terminal from the source base station to the target base station;
- a processing unit configured to generate serial number status transmission information
- the sending unit is further configured to send, according to the foregoing handover command, sequence number status transmission information to the target base station, and indicate a start number of downlink data to be allocated by the target base station.
- the sending unit 701 is further configured to: after the terminal successfully accesses the target base station, forward the downlink data to the target base station, where the target base station sends the downlink to the terminal data.
- the sending unit is further configured to: after the terminal successfully accesses the target base station, forward the downlink data to the target base station, where the target base station is used. Sending the above downlink data to the terminal.
- the sending unit is further configured to: after the terminal successfully accesses the target base station, forward the downlink data to the target base station, where the target base station is used. Sending the above downlink data to the terminal.
- the sending unit may be further configured to: after the terminal successfully accesses the target base station, send the source base station to the target base station. The number of the last downstream data sent to the terminal.
- the terminal can receive the downlink data sent by the serving gateway through the source base station and the target base station, thereby improving the transmission performance during handover, and further improving the user experience.
- a seventh aspect provides a base station, the base station including a processor and a memory.
- the memory is used to store instructions for executing instructions stored in the memory.
- the processor :
- the first status report is sent to the terminal, and the first status report is used to indicate to the terminal, the uplink data of the base station to the terminal. Receiving status.
- the foregoing base station further includes a receiver and a transmitter.
- the processor executes instructions stored in the memory to control the receiver to receive the letter No. and control the transmitter to send a signal. The actions performed by the receiver and/or transmitter described above are triggered by the processor.
- the transmitter is configured to send a handover command to the terminal, for triggering a handover process of the terminal from the base station to the target base station, where the base station maintains transmission of user data with the terminal;
- the transmitter is further configured to: when the transmission of user data between the base station and the terminal is changed from being maintained to being stopped in the handover process, the base station sends a first status report to the terminal, where the first status report is used to indicate to the terminal, the base station The reception status of the uplink data of the terminal.
- the receiver is configured to receive an access indication sent by the target base station during the handover process, to indicate that the terminal successfully connects Into the target base station;
- the transmitter specifically includes:
- the receiver receives the access indication sent by the target base station, the first status report is sent to the terminal.
- the receiving unit is configured to: when the handover process is performed, receive a handover indication sent by the terminal, to indicate that the terminal is disconnected or about to Disconnect the base station;
- the transmitter is specifically used to:
- the receiver receives the handover indication sent by the terminal, the first status report is sent to the terminal.
- the receiver after the receiver receives the handover indication sent by the terminal, the receiver is further configured to:
- the transmitter after the transmitter sends the first status report to the terminal, the transmitter is further configured to:
- the second status report sent by the receiver receiving terminal, the serial number status transmission information is further used to indicate to the target base station, The transmission status of the downlink data of the terminal by the base station.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the RLC status report indicates:
- the PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the transmission efficiency of the user data can be effectively improved, the processing load of the base station is reduced, and the signaling overhead of the system is reduced.
- An eighth aspect provides a terminal, the terminal comprising a processor and a memory.
- the memory is used to store instructions for executing instructions stored in the memory.
- the processor :
- the first status report sent by the source base station is received, and the first status report is used to indicate to the terminal, the source base station is to the terminal.
- the receiving status of the uplink data is also used in the handover process.
- the foregoing terminal further includes a receiver and a transmitter.
- the processor executes instructions stored in the memory to control the receiver to receive signals and to control the transmitter to transmit signals. The actions performed by the receiver and/or transmitter described above are triggered by the processor.
- the receiver is configured to receive a handover command sent by the source base station.
- the processor is configured to trigger a handover process from the source base station to the target base station based on the handover command, where the source base station maintains transmission of user data with the terminal;
- the receiver is further configured to receive, by the source base station, a first status report sent by the source base station when the transmission of the user data between the source base station and the terminal is changed from being maintained to being stopped, and the first status report is used to indicate to the terminal, The receiving status of the uplink data of the terminal by the source base station.
- the receiver in the handover process, when the source base station stops the transmission of user data with the terminal, the receiver is specifically configured to:
- the source base station receives the access indication sent by the target base station, receiving the first status report sent by the source base station;
- the access indication is used to indicate to the source base station that the terminal successfully accesses the target base station.
- the sending device is configured to send a handover indication to the source base station during the handover process, to indicate that the terminal is disconnected or about to be Disconnecting from the source base station;
- the terminal receives the first status report sent by the source base station, and the receiver is specifically configured to:
- the first status report sent by the source base station is received based on the handover indication sent by the terminal.
- the transmitter after the transmitter sends the handover indication to the source base station, the transmitter is further configured to:
- the source base station sends a second status report, where the second status report is used to indicate to the source base station, the receiving status of the downlink data of the terminal.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the RLC status report indicates:
- the PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the transmission efficiency of the user data can be effectively improved, the processing load of the base station is reduced, and the signaling overhead of the system is reduced.
- the transmission method provided by the embodiment of the present invention reasonably adjusts the transmission mode of user data in the handover process. Therefore, the method provided by the embodiment of the present invention can ensure effective transmission of user data, improve transmission efficiency, and improve user experience to a certain extent relative to the prior art.
- FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention.
- FIG. 2 shows a schematic flow chart of a handover procedure according to an embodiment of the present invention.
- FIG. 3 shows a schematic flowchart of a transmission method according to an embodiment of the present invention.
- FIG. 3A is another schematic flowchart of a transmission method according to an embodiment of the present invention.
- FIG. 4 shows still another schematic flowchart of a transmission method according to an embodiment of the present invention.
- FIG. 5 shows a schematic block diagram of a base station according to an embodiment of the present invention.
- FIG. 6 shows another schematic block diagram of a user equipment according to an embodiment of the present invention.
- FIG. 7 shows still another schematic block diagram of a base station according to an embodiment of the present invention.
- FIG. 8 shows a schematic block diagram of a network device according to an embodiment of the present invention.
- a user equipment may also be referred to as a terminal, a mobile station (Mobile Station, simply referred to as "MS"), a mobile terminal (Mobile Terminal), and the like.
- the user equipment may communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment may be a mobile phone (or "cellular" phone), having
- RAN Radio Access Network
- the user equipment may be a mobile phone (or "cellular" phone), having
- the computer or the like of the mobile terminal for example, the user device may also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges language and/or data with the wireless access network.
- the embodiments of the present invention are not limited thereto, but for convenience of description, the following embodiments will be described by taking a terminal as an example.
- the base station may be a base station (Base Transceiver Station, abbreviated as "BTS”) in GSM, or may be a base station (NodeB, referred to as "NB") in WCDMA, or may be an evolution in LTE.
- BTS Base Transceiver Station
- NodeB NodeB
- WCDMA Wideband Code Division Multiple Access
- eNB or e-NodeB Evolved Node B
- Carrier Aggregation (CAR) Technology is introduced as a new technology into the LTE-Advanced (LTE-A) standard.
- a user equipment User Equipment, referred to as "UE"
- UE User Equipment
- the carrier aggregation of the Long Term Evolution (LTE) system can be divided into intra-base station cell aggregation, inter-base station cell aggregation, and the like.
- the cell aggregation in the base station means that for one UE, the aggregated serving cells belong to the same base station. Since the aggregated serving cell is controlled by only one base station, the cell aggregation in the base station is relatively simple.
- the 12th version (Release-12) being developed introduces inter-base station cell aggregation, also called Dual Connectivity ("DC").
- the DC supports multiple cells in two base stations for carrier aggregation, thus providing a better user experience for the user.
- one of the base stations is a primary base station (Master eNB, abbreviated as "MeNB"), and the other base stations are secondary base stations (Secondary eNBs). Referred to as "SeNB", the primary base station assumes more control functions, generally a macro base station, and the secondary base station is generally a small base station.
- the handover process of the embodiment of the present invention can be applied to a single carrier scenario, a cell aggregation scenario in a base station, and a dual connectivity scenario.
- the terminal based on a single carrier scenario, the terminal remains connected to a serving cell when a handover occurs.
- the terminal is connected to at least two base stations.
- the terminal taking the cell aggregation scenario in the base station as an example, when the handover occurs, the terminal is connected to at least two cells under the same base station.
- the embodiment of the present invention is not limited thereto, that is, the embodiment of the present invention is also applicable to handover in a base station and handover between base stations. However, for convenience of description, the following embodiments will be described by taking an example of switching between base stations.
- FIG. 1 shows a schematic diagram of an embodiment of the present invention applied to an LTE system.
- the base station 11 and the base station 12 are responsible for radio resource management, connection control, cell management, scheduling, and the like of the radio interface, and the base station 11 and the base station 12 can perform communication connection through the X2 interface, and can separately
- the S1 interface is connected to a Mobility Management Entity (MME)/Serving GateWay (SGW) 14; in addition, the base station 11 and the base station 12 can also respectively pass the Uu interface. It is communicatively connected to the terminal 13.
- MME Mobility Management Entity
- SGW Serving GateWay
- the embodiment of the present invention is only described by taking an LTE system as an example, but the present invention is not limited thereto, and the technical solution according to the embodiment of the present invention may also be applied to other communication systems, for example, an LTE-A system and the like.
- LTE-A system and the like.
- the LTE system shown in FIG. 1 is described by taking one terminal and two base stations as an example, but the LTE system may further include a larger number of terminals and base stations.
- FIG. 2 shows the basic flow of a handover procedure, in this example, including a terminal, a source base station, and a target base station.
- the steps of the switching process are as follows:
- the source base station sends a handover request to the target base station (English is a handover request, referred to as HO request).
- the foregoing handover request may request the target base station to accept the handover of the terminal.
- the target base station sends a handover request acknowledgement (English as a handover request acknowledge, referred to as HO request ACK) to the source base station.
- a handover request acknowledgement (English as a handover request acknowledge, referred to as HO request ACK)
- the source base station sends a handover command to the terminal (in English, a handover command, referred to as HO command).
- the above handover command can be used to trigger handover of the terminal to the target base station.
- the terminal sends handover completion information to the target base station.
- the terminal can acquire the uplink resource by using a random access procedure, and send the foregoing handover completion information to the target base station.
- the foregoing switching process may further include:
- the terminal triggers random access to the target base station (English is random access).
- the foregoing random access may implement the terminal to finally access the target base station in a contention or non-contention manner.
- the terminal sends a random access preamble to the target base station (English random access preamble). Based on the random access preamble, the target base station returns a random access response (English random access response) to the terminal, which includes an uplink grant (English uplink grant) and timing synchronization information (in English, timing alignment information) ).
- the timing synchronization information is used to implement uplink synchronization between the terminal and the target base station.
- the terminal can acquire the uplink resource by using the uplink grant in the random access response, and send the foregoing handover completion information to the target base station.
- the uplink resource may also be obtained by using any one of the following methods:
- the target base station periodically allocates uplink resources to the terminal;
- the source base station carries the uplink resource in the handover command and sends the uplink resource to the terminal.
- a terminal sends uplink data to a network, which may be understood to include at least a source base station, and/or a target base station.
- the above line data may further include:
- the source base station forwards the uplink data sent by the terminal to the target base station.
- the source base station may forward, to the target base station, the downlink data that the source base station cannot confirm whether the terminal receives.
- the terminal and the source base station can maintain communication, that is, the uplink and downlink user data can be mutually transmitted between the terminal and the source base station.
- the target base station can obtain the terminal on the following two ways: Line data:
- the source base station obtains the uplink data of the terminal, and the uplink data may be the uplink data obtained by the source base station from the terminal before or during the handover.
- the target base station directly transmits the uplink data to the target base station, for example, the target base station indicates that the terminal sends the uplink data to the target base station, and the uplink data may be sent by the terminal to the source base station before or during the handover.
- the uplink data of the source base station feedback confirmation (English is acknowledged) has not been received yet.
- the terminal after the terminal sends the uplink data to the base station, if the base station receives the data correctly, the base station notifies the terminal to the terminal by using an acknowledge mode (English is an acknowledge mode).
- an acknowledge mode English is an acknowledge mode.
- the terminal receives the acknowledgment message sent by the eNB (the acknowledgment in English, ACK for short)
- the terminal will continue to perform the new uplink transmission;
- the terminal receives the unacknowledged information sent by the base station (non-acknowledge in English, abbreviated as NACK)
- the terminal performs the Uplink retransmission.
- the base station as the receiver will occasionally send a status report to the terminal to indicate which data is received by the terminal and which data has not been received. Because the status report is sent irregularly, the uplink and downlink user data transmitted between the source base station and the terminal cannot be notified in real time through the status report. Therefore, for the handover process, even if the terminal and the source base station maintain communication of user data, they cannot know in real time whether the peer end correctly receives.
- the terminal 2 directly transmits the uplink data to the target base station, but the uplink data that has been received by the source base station but has not been fed back to the terminal, and the uplink data can be transmitted to the target through the source base station.
- Base station forwarding It can be seen that, based on the above two methods, the terminal and the source base station repeatedly transmit the uplink data of the terminal to the target base station, which causes the target base station to acquire the redundancy of the uplink data of the terminal, thereby affecting the uplink data transmission efficiency.
- the embodiment of the present invention provides a transmission method, which can effectively improve the transmission efficiency of user data, reduce the processing load of the base station, and reduce the signaling overhead of the system.
- FIG. 3 illustrates a transmission method 300 according to an embodiment of the present invention. Specifically, the method 300 is performed by a source base station, and the method 300 includes:
- the source base station sends a handover command to the terminal, and is used to trigger a handover process of the terminal from the source base station to the target base station.
- the source base station sends a first status report to the terminal, where the first status report is used to indicate to the terminal, the status of receiving the uplink data of the terminal by the source base station.
- the step/action sent by the source base station to the terminal may be understood as the step/action sent by the terminal receiving source base station.
- the above 301 and 302 can be interpreted from the perspective of the terminal as:
- the terminal receives a handover command sent by the source base station.
- the terminal based on the handover command, the terminal triggers a handover procedure from the source base station to the target base station.
- the terminal in the handover process, when the transmission of user data between the source base station and the terminal is changed from being maintained to being stopped, the terminal receives a first status report sent by the source base station, where the first status report is used to The terminal indicates the receiving status of the uplink data of the terminal by the source base station.
- the signaling and data transmission between the terminal and the base station may be separately understood from the sender or the receiver, and details are not described herein.
- the sender is the base station, and the receiver is the terminal; in the above behavior example, the sender is the terminal, and the receiver is the base station.
- the handover process may be understood as starting from a source base station sending a handover command to the terminal until the source base station forwards the user data to the target base station. It can be understood that, in the foregoing handover process, the source base station can maintain transmission of user data with the terminal for a period of time, and then the transmission of the user data can be stopped between the source base station and the terminal.
- the source base station may send the handover command to the terminal, that is, the source base station has sent the handover request to the target base station, and receives the handover response of the target base station.
- the foregoing handover command may include mobility control information (English is mobility control information) carried by a radio resource control (RRC) message.
- RRC radio resource control
- the source base station and the terminal are changed from maintaining transmission of user data to stopping transmission of user data, which may be understood as: during the handover process, the source base station maintains communication of uplink and downlink user data with the terminal in a certain period of time. . However, starting from a later point in time, the source base station stops uplink and downlink user data transmission with the terminal. Alternatively, the source base station presets a timer, and when the timer expires, the source base station considers that the terminal is about to disconnect from the source base station.
- the specific setting manner of maintaining and ending the user data communication between the source base station and the terminal is not limited in the embodiment of the present invention.
- the first status report may indicate uplink data received by the source base station from the terminal, and/or uplink data that the source base station fails to receive from the terminal.
- the first status report may indicate the number of uplinks of the next unreceived terminal of the source base station. According to; or, indicating the first lost uplink data of the source base station.
- the first status report may indicate the last terminal uplink data received by the source base station; or indicate the last uplink data of the source base station that is not lost.
- the uplink data indicated in the foregoing first status report can be represented as a sequence number (sequence numbe, SN for short) or a value (count is English) corresponding to the uplink data.
- the first status report is a radio link control (RLC) status report
- the RLC status report indicates the sequence number of the next unreceived uplink data of the source base station and before the sequence number.
- the first status report is a packet data convergence protocol (PDCP) status report
- PDCP status report indicates that the sequence number of the first lost uplink data of the source base station starts from the sequence number.
- the serial number of the unreceived upstream data is a packet data convergence protocol (PDCP) status report.
- the source base station sends an RLC status report
- the terminal can learn, according to the received RLC status report, the correspondence between the RLC sequence number and the PDCP sequence number, which uplink data (for example, a PDCP data packet) has been successfully received by the source base station.
- the terminal can directly learn, according to the first status report, which uplink data (for example, a PDCP data packet) has been successfully received by the source base station.
- the serial number corresponding to the user data is more commonly used.
- the X2 port transmission for example, communication between the source base station and the target base station, the value corresponding to the user data is more commonly used.
- the specific indication and identifier of the uplink data in the first status report are not limited.
- the method may further include: in the handover process, the source base station receives an access indication sent by the target base station, and is used to indicate that the terminal successfully accesses the target base station.
- the terminal After the terminal sends a random access preamble to the target base station to trigger the contention/non-contention random access, the terminal acquires the uplink resource that can send the handover complete message and implements the uplink synchronization with the target through the random access response sent by the target base station. Timing synchronization information.
- the terminal sends a handover complete message to the target base station.
- the target base station may send an access indication that the terminal successfully accesses to the source base station, indicating that the terminal completes the handover from the source base station to the target base station.
- the method may further include: in the handover process, the source base station receives the handover indication sent by the terminal, and is used to indicate that the terminal disconnects or is about to disconnect from the source base station.
- the timing at which the terminal sends the handover indication to the source base station is generally before the terminal initiates the random access procedure.
- the terminal may disconnect the source base station and perform random access with the target base station. Specifically, when the terminal sends the handover indication, on the one hand, The terminal does not send the uplink data to the source base station again. On the other hand, the terminal notifies the source base station that the downlink data sent by the source base station is no longer received, and the source base station stops sending downlink data to the terminal.
- condition that the source base station sends the first status report to the terminal may be any one of the following:
- the source base station when the source base station receives the handover indication sent by the terminal, the source base station sends a first status report to the terminal.
- Condition c When the timer of the source base station times out, the source base station sends a first status report to the terminal.
- the source base station may start a timer after transmitting the handover command. After the timer expires, the source base station considers that the terminal is about to disconnect from the source base station, and the source base station sends a first status report to the terminal. Optionally, the source base station periodically sends the first status report to the terminal.
- the duration of the above periodic timer can be determined by the base station. For example, the source base station estimates the length of time that the terminal disconnects from the source base station, and uses the duration as the duration of the timer. For example, the duration of the period timer may be 10 milliseconds. When the period exceeds 10 milliseconds, the source base station is triggered to send a first status report to the terminal.
- the method may further include:
- the source base station sends, to the target base station, sequence number transfer (Sequence Status Transfer, SN status transfer) information, for indicating to the target base station, the source base station receiving status of the uplink data of the terminal;
- sequence number transfer Sequence Status Transfer, SN status transfer
- the source base station forwards the acquired uplink data of the terminal to the target base station.
- the sequence number status transmission information may indicate uplink data received by the source base station from the terminal, and/or uplink data that the source base station fails to receive from the terminal.
- the sequence number status transmission information may indicate the next unreceived terminal uplink data of the source base station; or indicate the first lost uplink data of the source base station.
- the first status report may indicate the last terminal uplink data received by the source base station; or indicate the last uplink data of the source base station that is not lost.
- sequence number status transmission information may include a sequence number of the first lost uplink data of the source base station and a sequence number of the unreceived uplink data starting from the sequence number.
- the role of the serial number status transmission information is that the source base station informs the target base station of the uplink data acquired by the source base station from the terminal. Then, through uplink data forwarding, the source base station to the target base station The uplink data that has been acquired from the terminal is transmitted. The uplink data may have been sent to the source base station, but the terminal has not received the acknowledgement from the source base station. During the period, the target base station directly schedules the uplink data of the terminal, and triggers the terminal to resend the uplink data to the target base station. In the prior art, the source base station and the terminal repeatedly send the same uplink data to the target base station.
- the source base station sends a first status report to the terminal in time, and the terminal can know which uplink data has been obtained earlier according to the received first status report.
- the source base station successfully receives, so the terminal does not send the same uplink data to the target base station, which improves the transmission efficiency of the uplink data.
- the method further includes:
- the source base station receives a second status report sent by the terminal, where the second status report is used to indicate to the source base station, the receiving status of the downlink data of the terminal.
- the terminal when the terminal is about to disconnect from the source base station, the terminal sends a second status report to the source base station.
- the source base station receives a second status report sent by the terminal, where the second status report is used to indicate to the source base station, the receiving status of the downlink data of the terminal.
- the second status report may be an RLC status report or a PDCP status report.
- the second status report can include any of the following:
- the second status report is an RLC status report
- the sequence number of the next unreceived downlink data of the terminal and the sequence number of all unreceived downlink data before the sequence number
- the sequence number of the first lost downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the sequence number status transmission information that is sent by the source base station to the target base station is further used to indicate to the target base station, the status of the downlink data transmission by the source base station to the terminal.
- the source base station may more accurately indicate the transmission status of the downlink data of the terminal by the source base station to the target base station. After that, the downlink data forwarded by the target base station to the terminal does not include the downlink data of the source base station that the terminal has successfully received, so that the transmission efficiency of the downlink data can be further improved.
- the embodiment of the present invention describes a transmission method involving an inter-base station handover procedure, the same is applicable to a transmission method of a handover procedure in a base station.
- the transmission method of intra-base station handover does not involve the source base station and the target base station, but the handover between different cells under the same base station. Therefore, Based on the handover process, the transmission method in the intra-base station handover method can further omit the signaling interaction between the source base station and the target base station, thereby saving system overhead.
- a further embodiment of the present invention focuses on a scenario in which a network sends downlink data to a terminal, the network including at least a source base station, and/or a target base station.
- the terminal and the source base station can maintain user data communication in any period of time from 201 to 204, 201 to 206, or 201 to 208.
- the target base station After the target base station starts 208, it starts to send downlink data to the terminal. Therefore, in the downlink, in the handover process, the terminal can only obtain downlink data from the source base station separately, but cannot obtain downlink data from the target base station, thereby reducing the throughput of the terminal and affecting the downlink data transmission efficiency during the handover process.
- the embodiment of the present invention provides a method for transmitting downlink data, which can effectively improve the transmission efficiency of downlink data during the handover process.
- FIG. 4 illustrates a method 400 for transmitting downlink data according to another embodiment of the present invention.
- the method 400 can be performed by a source base station, and the method 400 includes:
- the source base station sends a handover command to the terminal, and is used to trigger a handover process of the terminal from the source base station to the target base station.
- the source base station sends, according to the foregoing handover command, the sequence number status transmission information to the target base station, indicating a start number of downlink data to be allocated by the target base station.
- the foregoing method further includes:
- the target base station transmits the downlink data acquired from the serving gateway to the terminal.
- the terminal can obtain downlink data sent by the serving gateway from the source base station and the target base station, respectively, and improve downlink transmission efficiency.
- the foregoing method may further include:
- the source base station forwards the downlink data to the target base station, where the target base station sends the downlink data to the terminal.
- the downlink data that is forwarded may be downlink data that the source base station has not sent to the terminal.
- the terminal Delaying the downlink user data of the source base station to the target base station, further avoiding the target base During the handover process, the terminal repeatedly transmits to the terminal, and the terminal has successfully obtained the downlink data from the source base station, thereby further improving the transmission efficiency of the downlink data.
- the source base station sends the sequence number state transmission information to the target base station according to the handover command, which may specifically meet any of the following conditions:
- the source base station After the source base station sends the foregoing handover command to the terminal, the source base station immediately sends the serial number status transmission information to the target base station; or
- Condition 2 Before the terminal triggers random access to the target base station, the source base station sends the serial number status transmission information to the target base station.
- serial number status transmission information may be represented by at least one of the following methods:
- the value is used to indicate the next unassigned number of the source base station.
- the offset is used to indicate the number reserved by the source base station for transmitting downlink data by itself. Therefore, the target base station may select, according to the value and the offset, the number of the downlink data that the target base station sends to the terminal for the first time. Specifically, due to the need to indicate to the target base station in the sequence number state transmission information, the starting value of the downlink data to be transmitted by the target base station to the terminal.
- the starting value may be that the target base station assigns a number starting from a specific value.
- the source base station Because the source base station needs to continue to allocate the number of the downlink data to the terminal during the handover process, the source base station also reserves a certain number (assuming the value is offset), that is, the source base station will use a number to use it. Therefore, in the SN status transfer sent by the source base station to the target base station, the number of numbers reserved by the source base station and the number to be assigned by the source base station may be carried.
- the target base station allocates a number to the downlink data, for example, starting from the sum of the next number to be allocated by the source base station and the number of numbers reserved by the source base station, for the target base station to be next. The number corresponding to the downstream data to be transmitted.
- the last number assigned by the source base station is 5, and the next unassigned number of the source base station is 6.
- the sequence number status transmission information sent by the source base station to the target base station includes count 6 and an offset of 10.
- Manner 2 The number of the last downlink data reserved by the source base station. Therefore, the target base station may select, according to the number of the last downlink data, the number of the downlink data that the target base station sends to the terminal for the first time.
- the SN status transfer message sent by the source base station to the target base station directly carries the next number to be assigned by the target base station, where the number is the next number and source to be allocated by the source base station. The sum of the number of numbers reserved by the base station. Therefore, the target base station can start transmitting downlink data from the next number to be allocated by the target base station.
- the above number may be represented as a PDCP serial number.
- the foregoing method may further include:
- the source base station After the terminal successfully accesses the target base station, the source base station sends the number of the last downlink data that the source base station actually sends to the terminal to the target base station.
- the source base station is not enough. For example, after the source base station sends the SN status transfer, the number of downlink data received from the serving gateway needs to be greater than the offset. Thus, for downlink data after offset, the source base station has no number to assign.
- the source base station After receiving the access indication sent by the target base station, the source base station sends the usage status of the reserved number of the source base station to the target base station. For example, the number of reserved numbers has been assigned; or the number of remaining unassigned numbers; or, the last assigned value; or, unused numeric ranges, and so on.
- the target base station can forward the above to the terminal, so that the terminal can skip this unused value interval when it is delivered in order.
- the downlink data of the unassigned number cannot be sent by the source base station, and the source base station forwards the downlink data of the unassigned number to the target base station, and sends the data to the terminal through the target base station.
- the target base station can send the downlink data received from the serving gateway to the terminal during the handover process, thereby improving the transmission performance during handover, and further improving the user experience.
- the embodiment of the present invention describes a transmission method involving an inter-base station handover procedure, the same is applicable to a transmission method of a handover procedure in a base station.
- the difference is that the transmission method of intra-base station handover does not involve the source base station and the target base station, but the same base station. Therefore, based on the handover process, the transmission method in the base station can further omit the signaling interaction between the source base station and the target base station, and thus the system overhead is saved.
- FIG. 5 shows a schematic block diagram of a base station 500, which may be a source base station, and the base station 500 includes:
- the sending unit 501 is configured to send a handover command to the terminal, where used to trigger a handover process of the terminal from the base station to the target base station;
- the processing unit 502 is configured to maintain transmission of user data between the base station and the terminal;
- the sending unit 501 is further configured to: when the transmission of the user data between the base station and the terminal is changed from being maintained to being stopped, the first status report is sent to the terminal, where the first status report is used to indicate to the terminal, The receiving status of the uplink data of the terminal by the base station.
- the foregoing base station 500 may further include:
- the receiving unit 503 is configured to receive, according to the handover process, an access indication sent by the target base station, to indicate that the terminal successfully accesses the target base station;
- the sending unit 501 specifically includes:
- the receiving unit when the receiving unit receives the access indication sent by the target base station, the first status report is sent to the terminal.
- the receiving unit 503 may be configured to: when the handover process is performed, receive a handover indication sent by the terminal, to indicate that the terminal disconnects or is about to disconnect from the base station;
- the sending unit 501 specifically includes:
- the receiving unit receives the handover indication sent by the terminal, the first status report is sent to the terminal.
- the source base station sends a first status report to the terminal in time, and the terminal can know which uplink data has been obtained earlier according to the received first status report.
- the source base station successfully receives, so the terminal does not send the same uplink data to the target base station, which improves the transmission efficiency of the uplink data.
- the receiving unit 503 is further configured to:
- the sending unit 501 is further configured to:
- sequence number status transmission information may include a sequence number of the first lost uplink data of the source base station and a sequence number of the unreceived uplink data starting from the sequence number.
- the receiving unit 503 receives the second status report sent by the terminal, and the sequence number status transmission information is further used to indicate to the target base station, the status of the downlink data transmission by the base station to the terminal.
- the source base station may more accurately indicate the transmission status of the downlink data of the terminal by the source base station to the target base station. After that, the downlink data forwarded by the target base station to the terminal does not include the downlink data of the source base station that the terminal has successfully received, so that the transmission efficiency of the downlink data can be further improved.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the foregoing RLC status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of all unreceived downlink data before the sequence number.
- the foregoing PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the embodiment of the present invention can effectively improve the transmission efficiency of user data, reduce the processing load of the base station, and reduce the signaling overhead of the system.
- the base station 500 may correspond to the source base station of the transmission method of the embodiment of the present invention, and the above and other operations and/or functions of the respective modules in the base station 500 are respectively implemented in order to implement FIG. 1 to FIG. The corresponding processes of each method in the following are not repeated here for brevity.
- FIG. 6 shows a schematic block diagram of a terminal 600 according to an embodiment of the present invention, the terminal 600 comprising:
- the receiving unit 601 is configured to receive a handover command sent by the source base station;
- the processing unit 603 is configured to trigger a handover process from the source base station to the target base station based on the handover command, and maintain transmission of user data with the source base station;
- the receiving unit 601 is further configured to: during the handover process, user data between the source base station and the terminal When the transmission is changed from the maintenance to the stop, the first status report sent by the source base station is used, and the first status report is used to indicate to the terminal, the status of the uplink data received by the source base station to the terminal.
- the receiving unit 601 is specifically configured to:
- the source base station receives the access indication sent by the target base station, receiving the first status report sent by the source base station;
- the access indication is used to indicate to the source base station that the terminal successfully accesses the target base station.
- the terminal 600 further includes a sending unit 605, configured to:
- the terminal receives the first status report sent by the source base station, and the receiving unit 601 is specifically configured to:
- the source base station sends a first status report to the terminal in time, and the terminal can know which uplink data has been obtained earlier according to the received first status report.
- the source base station successfully receives, so the terminal does not send the same uplink data to the target base station, which improves the transmission efficiency of the uplink data.
- the sending unit 605 is further configured to:
- the source base station may more accurately indicate the transmission status of the downlink data of the terminal by the source base station to the target base station. After that, the downlink data forwarded by the target base station to the terminal does not include the downlink data of the source base station that the terminal has successfully received, so that the transmission efficiency of the downlink data can be further improved.
- the first status report or the second status report is any one of the following:
- Radio Link Control (RLC) status report
- PDCP Packet Data Convergence Protocol
- the RLC status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of all unreceived downlink data before the sequence number.
- the PDCP status report indicates:
- sequence number of the next unreceived downlink data of the terminal and the sequence number of the unreceived downlink data starting from the sequence number.
- the embodiment of the present invention can effectively improve the transmission efficiency of user data, reduce the processing load of the base station, and reduce the signaling overhead of the system.
- terminal 600 may correspond to the terminal of the transmission method of the embodiment of the present invention, and the foregoing and other operations and/or functions of the respective modules in the terminal 600 are respectively implemented in FIG. 1 to FIG. The corresponding processes of the various methods are not repeated here for the sake of brevity.
- FIG. 7 is a schematic block diagram of a base station 700, which may be a source base station, and the base station 700 includes:
- the sending unit 701 is configured to send a handover command to the terminal, to trigger a handover process of the terminal from the source base station to the target base station;
- the processing unit 703 is configured to generate sequence number state transmission information, and indicate a starting number of downlink data to be allocated by the target base station;
- the sending unit 701 is further configured to send sequence number state transmission information to the target base station based on the handover command.
- the terminal may obtain downlink data sent by the serving gateway from the source base station and the target base station, respectively, and improve downlink transmission efficiency.
- the sending unit 701 is further configured to: after the terminal successfully accesses the target base station, forward the downlink data to the target base station, where the target base station sends the downlink data to the terminal.
- the downlink user data of the source base station is forwarded to the target base station, which further prevents the target base station from repeatedly transmitting to the terminal during the handover process, and the downlink data successfully acquired by the terminal from the source base station further improves the transmission efficiency of the downlink data.
- the source base station sends the sequence number state transmission information to the target base station according to the handover command, which may specifically meet any of the following conditions:
- Condition 2 Before the terminal triggers random access to the target base station, the source base station sends the serial number status transmission information to the target base station.
- serial number status transmission information may be represented by at least one of the following methods:
- the value is used to indicate the next unassigned number of the source base station.
- the offset is used to indicate the number reserved by the source base station for transmitting downlink data by itself. Therefore, the target base station may select, according to the value and the offset, the number of the downlink data that the target base station sends to the terminal for the first time. Specifically, due to the need to indicate to the target base station in the sequence number state transmission information, the starting value of the downlink data to be transmitted by the target base station to the terminal.
- the starting value may be that the target base station assigns a number starting from a specific value.
- the source base station Because the source base station needs to continue to allocate the number of the downlink data to the terminal during the handover process, the source base station also reserves a certain number (assuming the value is offset), that is, the source base station will use a number to use it. Therefore, in the SN status transfer sent by the source base station to the target base station, the number of numbers reserved by the source base station and the number to be assigned by the source base station may be carried.
- the target base station allocates a number to the downlink data, for example, starting from the sum of the next number to be allocated by the source base station and the number of numbers reserved by the source base station, for the target base station to be next. The number corresponding to the downstream data to be transmitted.
- the last number assigned by the source base station is 5, and the next unassigned number of the source base station is 6.
- the sequence number status transmission information sent by the source base station to the target base station includes count 6 and an offset of 10.
- Manner 2 The number of the last downlink data reserved by the source base station. Therefore, the target base station may select, according to the number of the last downlink data, the number of the downlink data that the target base station sends to the terminal for the first time.
- the SN status transfer message sent by the source base station to the target base station directly carries the next number to be assigned by the target base station, where the number is the sum of the number to be allocated by the source base station and the number of numbers reserved by the source base station. Therefore, the target base station can start transmitting downlink data from the next number to be allocated by the target base station.
- the above number may be represented as a PDCP serial number.
- the foregoing method may further include:
- the source base station After the terminal successfully accesses the target base station, the source base station sends the actual base station to the target base station. The number of the last downlink data sent by the terminal.
- the sending unit 701 is further configured to: after the terminal successfully accesses the target base station, send, to the target base station, a number of the last downlink data that the source base station actually sends to the terminal.
- the terminal can receive the downlink data sent by the serving gateway by using the source base station and the target base station, respectively, to improve the transmission performance during handover, and further improve the user experience.
- the base station 700 may correspond to the source base station of the transmission method of the embodiment of the present invention, and the foregoing and other operations and/or functions of the respective modules in the foregoing base station 700 are respectively implemented in order to implement FIG. 1 to FIG. The corresponding processes of each method in the following are not repeated here for brevity.
- the terminal and/or the base station in the above device embodiments may further comprise a memory or a bus system, respectively.
- the processor, the memory, the receiver and the transmitter are connected by a bus system for storing instructions for executing instructions stored in the memory to control the receiver to receive signals and to control the transmitter to transmit signals.
- the action of the receiving unit in the above embodiment may be performed by a receiver
- the action of the transmitting unit may be performed by a transmitter
- the action of the processing unit may be performed by the processor.
- the network device 800 can be the base station or terminal in the foregoing embodiment, including the processor 801, the receiver 802, the memory 803, the transmitter 804, and the bus 805.
- the processor may be a central processing unit (“CPU"), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and dedicated processors. Integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc.
- the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
- the memory can include read only memory and random access memory and provides instructions and data to the processor.
- a portion of the memory may also include a non-volatile random access memory.
- the memory can also store information of the device type.
- the bus system may include a power bus, a control bus, and a status signal bus in addition to the data bus.
- various buses are referred to as bus systems.
- each step of the above method can pass the integration logic of the hardware in the processor. Instructions in the form of circuits or software are completed.
- the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
- the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
- the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.
- the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
- the implementation process constitutes any limitation.
- the disclosed systems, devices, and methods may be implemented in other manners.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
- the units described as separate components may or may not be physically separate.
- the components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
- the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
- the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
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Abstract
本发明实施例提供一种传输方法、基站和终端,该方法包括:源基站向终端发送切换命令,用于触发终端从源基站向目标基站的切换过程,源基站维持与所述终端间的用户数据的传输;在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,源基站向终端发送第一状态报告,第一状态报告用于向终端指示,源基站对所述终端的上行数据的接收状况。从而,能够有效提高用户数据的传输效率。
Description
本发明实施例涉及通信领域,并且更具体地,涉及一种传输方法、基站和终端。
在通信系统中,用户设备与基站保持连接,从而实现各个用户设备之间的通信。
以长期演进(Long Term Evolution,简称为“LTE”)/增强型长期演进(Long Term Evolution-Advanced,简称为“LTE-A”)系统为例,用户设备(User Equipment,简称为“UE”)与演进型基站(Evolutional Node B,简称为“eNB或e-NodeB”)保持通信。当UE将移动出该演进型基站的覆盖范围时,或该演进型基站无法确保向UE提供服务或服务质量降低时,可以触发切换流程。此时,切换前的演进型基站可以称为源基站,切换后的基站可以称为目标基站。
现有技术中,一般采用如下两种切换方式:
第一种方式为,当源基站决定执行切换时,会停止与UE上下行用户数据的传输。直到切换完成后,目标基站才开始与UE进行用户数据的传输。因此,在切换过程中,UE与基站间中断了用户数据的传输,直到接入目标基站才恢复上述用户数据的传输。该方法降低了时延敏感业务的用户体验,进而限制了时延敏感业务在LTE系统上的应用。
第二种方式为,在切换过程中,UE仍旧保持与源基站的用户数据的传输。当UE成功切换至目标基站后,UE才断开与源基站的连接,以减少或避免因切换过程而引起的用户数据传输中断。
但是,现有技术缺乏一种具体的机制,可以实现在切换过程中,提升UE与基站间用户数据传输的有效性,从而可以提升用户体验。
发明内容
本发明实施例的切换过程,可以应用于单载波场景、基站内小区聚合场景、双连接场景。如,以单载波场景为例,在切换发生时,终端与一个服务
小区保持连接。又如,以双连接场景为例,在切换发生时,终端与至少两个基站连接。又如,以基站内小区聚合场景为例,在切换发生时,终端与同一个基站下的至少两个小区连接。
本发明实施例涉及基站间切换的传输方法,同样适用于基站内切换的传输方法。区别在于,基站内切换的传输方法,不涉及源基站和目标基站,而是同一个基站下不同小区间的切换。基于切换过程,基站内切换的传输方法比基站间切换的传输方法可以进一步省略源基站和目标基站间的信令交互,因而更为节省系统开销。
本发明实施例所述涉及的切换过程中,源基站可以维持与终端间的用户数据的传输。该用户数据传输例如可以为终端向源基站发送的上行用户数据的传输(以下简称上行传输),和/或,源基站向终端发送的下行用户数据的传输(以下简称下行传输)。上述维持用户数据的传输,可以理解为在切换过程中,在一段时间内源基站与终端有用户数据的传输,在该时间段后基站与终端停止用户数据的传输。
本发明实施例中,当源基站与终端之间用户数据的传输由维持转变成停止时,源基站向终端发送第一状态报告,第一状态报告用于向终端指示,源基站对终端的上行数据的接收状况。
本发明实施例中,当终端断开或即将断开源基站的连接时,终端向源基站发送第二状态报告,该第二状态报告用于向源基站指示,终端的下行数据的接收状况。
本发明实施例提供一种传输方法、基站和终端,能够有效提高用户数据的传输效率。
第一方面提供一种传输方法,该方法包括:
源基站向终端发送切换命令,用于触发终端从源基站向目标基站的切换过程,源基站维持与终端间的用户数据的传输;
在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,源基站向终端发送第一状态报告,第一状态报告用于向终端指示,源基站对终端的上行数据的接收状况。
结合第一方面,在第一方面的一种可能的实现方式中,该方法还包括:
在切换过程中,源基站接收目标基站发送的接入指示,用于指示终端成功接入目标基站;
在切换过程中,当源基站停止与终端间的用户数据的传输时,源基站向终端发送第一状态报告,具体包括:
在切换过程中,当源基站接收到目标基站发送的接入指示时,源基站向终端发送第一状态报告。
结合第一方面及上述可能的实现方式,在第一方面的一种可能的实现方式中,该方法还包括:
在切换过程中,源基站接收终端发送的切换指示,用于指示终端断开或即将断开与源基站的连接;
在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,源基站向终端发送第一状态报告,具体包括:
在切换过程中,当源基站接收终端发送的切换指示时,源基站向终端发送第一状态报告。
因而,上述传输方法,一旦源基站与终端在切换过程中的用户数据传输终止,源基站会及时向终端发送第一状态报告,终端能根据接收到的第一状态报告更早获知哪些上行数据已经被源基站成功接收,因而终端不再向目标基站发送同样的上行数据,提高了上行数据的传输效率。
结合第一方面及上述可能的实现方式,在第一方面的一种可能的实现方式中,在源基站接收终端发送的切换指示后,该方法还包括:
源基站接收终端发送的第二状态报告,第二状态报告用于向源基站指示,终端的下行数据的接收状况。
结合第一方面及上述可能的实现方式,在第一方面的一种可能的实现方式中,在源基站向终端发送第一状态报告之后,该方法还包括:
源基站向目标基站发送序列号状态传输信息,用于向目标基站指示,源基站对终端的上行数据的获取状况;
源基站向目标基站转发获取的终端的上行数据。
结合第一方面及上述可能的实现方式,在第一方面的一种可能的实现方式中,基于源基站接收终端发送的第二状态报告,序列号状态传输信息,还用于向目标基站指示,源基站对终端的下行数据的发送状况。
在本发明实施例中,基于上述第二状态报告,源基站向目标基站可以更为准确地指示源基站对终端的下行数据的发送状况。此后,目标基站向终端转发的下行数据中,不包括终端已经成功接收到的源基站的下行数据,从而
可以进一步提高下行数据的传输效率。
结合第一方面及上述可能的实现方式,在第一方面的一种可能的实现方式中,第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
结合第一方面及上述可能的实现方式,在第一方面的一种可能的实现方式中,RLC状态报告指示:源基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号;
PDCP状态报告指示:
源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
因而,上述传输方法,能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
第二方面提供一种传输方法,该方法包括:
终端接收源基站发送的切换命令;
基于切换命令,终端触发从源基站向目标基站的切换过程,源基站维持与终端间的用户数据的传输;
在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,终端接收源基站发送的第一状态报告,第一状态报告用于向终端指示,源基站对终端的上行数据的接收状况。
结合第二方面,在第二方面的一种可能的实现方式中,在切换过程中,当源基站停止与终端间的用户数据的传输时,终端接收源基站发送的第一状态报告,具体包括:
在切换过程中,当源基站接收到目标基站发送的接入指示时,终端接收源基站发送的第一状态报告;
其中,接入指示,用于向源基站指示终端成功接入目标基站。
结合第二方面及上述可能的实现方式,在第二方面的一种可能的实现方式中,还包括:
在切换过程中,终端向源基站发送切换指示,用于指示终端断开或即将断开与源基站的连接;
在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,终端接收源基站发送的第一状态报告,具体包括:
在切换过程中,基于终端发送的切换指示,终端接收源基站发送的第一状态报告。
结合第二方面及上述可能的实现方式,在第二方面的一种可能的实现方式中,该方法还包括:
终端向源基站发送第二状态报告,第二状态报告用于向源基站指示,终端的下行数据的接收状况。
结合第二方面及上述可能的实现方式,在第二方面的一种可能的实现方式中,第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
结合第二方面及上述可能的实现方式,在第二方面的一种可能的实现方式中,
RLC状态报告指示:
源基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号;
PDCP状态报告指示:
源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
上述传输方法,一旦源基站与终端在切换过程中的用户数据传输终止,源基站会及时向终端发送第一状态报告,终端能根据接收到的第一状态报告更早获知哪些上行数据已经被源基站成功接收,因而终端不再向目标基站发
送同样的上行数据,提高了上行数据的传输效率。
并且,基于上述第二状态报告,源基站向目标基站可以更为准确地指示源基站对终端的下行数据的发送状况。此后,目标基站向终端转发的下行数据中,不包括终端已经成功接收到的源基站的下行数据,从而可以进一步提高下行数据的传输效率。
因而,上述传输方法,能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
第三方面提供一种基站,该基站包括:
发送单元,用于向终端发送切换命令,用于触发终端从基站向目标基站的切换过程;
处理单元,用于维持基站与终端间的用户数据的传输;
发送单元,还用于在所切换过程中,当基站与终端之间用户数据的传输由维持转变成停止时,向终端发送第一状态报告,第一状态报告用于向终端指示,基站对终端的上行数据的接收状况。
结合第三方面,在第三方面的一种可能的实现方式中,该基站还包括:
接收单元,用于在切换过程中,接收目标基站发送的接入指示,用于指示终端成功接入目标基站;
发送单元,具体包括:
在切换过程中,当接收单元接收到目标基站发送的接入指示时,向终端发送第一状态报告。
结合第三方面及上述可能的实现方式,在第三方面的一种可能的实现方式中,该基站还包括:
接收单元,用于在切换过程中,接收终端发送的切换指示,用于指示终端断开或即将断开与基站的连接;
发送单元,具体包括:
在切换过程中,当接收单元接收终端发送的切换指示时,向终端发送第一状态报告。
结合第三方面及上述可能的实现方式,在第三方面的一种可能的实现方式中,在接收单元接收终端发送的切换指示后,接收单元还用于:
接收终端发送的第二状态报告,第二状态报告用于向基站指示,终端的
下行数据的接收状况。
结合第三方面及上述可能的实现方式,在第三方面的一种可能的实现方式中,在发送单元向终端发送第一状态报告之后,发送单元还用于:
向目标基站发送序列号状态传输信息,用于向目标基站指示,基站对终端的上行数据的获取状况;
向目标基站转发获取的终端的上行数据。
结合第三方面及上述可能的实现方式,在第三方面的一种可能的实现方式中,基于接收单元接收终端发送的第二状态报告,序列号状态传输信息,还用于向目标基站指示,基站对终端的下行数据的发送状况。
结合第三方面及上述可能的实现方式,在第三方面的一种可能的实现方式中,第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
结合第三方面及上述可能的实现方式,在第三方面的一种可能的实现方式中,RLC状态报告指示:
基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号;
PDCP状态报告指示:
基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
因而,能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
第四方面提供一种终端,该终端包括:
接收单元,用于接收源基站发送的切换命令;
处理单元,用于基于切换命令,触发从源基站向目标基站的切换过程,并维持与源基站间的用户数据的传输;
接收单元,还用于在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,接收源基站发送的第一状态报告,第一状态报告用于向终端指示,源基站对终端的上行数据的接收状况。
结合第四方面,在第四方面的一种可能的实现方式中,在切换过程中,当源基站与终端之间的用户数据的传输由维持变成停止时,接收单元具体用于:
在切换过程中,当源基站接收到目标基站发送的接入指示时,接收源基站发送的第一状态报告;
其中,接入指示,用于向源基站指示终端成功接入目标基站。
结合第四方面及上述可能的实现方式,在第四方面的一种可能的实现方式中,还包括发送单元,用于在切换过程中,向源基站发送切换指示,用于指示终端断开或即将断开与源基站的连接;
在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,终端接收源基站发送的第一状态报告,接收单元,具体用于:
在切换过程中,接收源基站发送的基于该切换指示的第一状态报告。
结合第四方面及上述可能的实现方式,在第四方面的一种可能的实现方式中,在发送单元向源基站发送切换指示后,发送单元还用于:
源基站发送第二状态报告,第二状态报告用于向源基站指示,终端的下行数据的接收状况。
结合第四方面及上述可能的实现方式,在第四方面的一种可能的实现方式中,第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
结合第四方面及上述可能的实现方式,在第四方面的一种可能的实现方式中,RLC状态报告指示:
源基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号;
PDCP状态报告指示:
源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到
的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
因而,能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
第五方面提供一种传输方法,该方法包括:
源基站向终端发送切换命令,用于触发终端从该源基站向目标基站的切换过程;
基于上述切换命令,该源基站向该目标基站发送序列号状态传输信息,指示用于该目标基站待分配的下行数据的起始编号。
结合第五方面,在第五方面的一种可能的实现方式中,根据上述序列号状态传输信息,目标基站向终端发送从服务网关获取的下行数据。
结合第五方面及上述可能的实现方式,在第五方面的一种可能的实现方式中,当终端成功接入目标基站后,该源基站向目标基站转发下行数据,用于目标基站向终端发送上述下行数据。
结合第五方面及上述可能的实现方式,在第五方面的一种可能的实现方式中,当源基站向终端发送上述切换命令后,该源基站即刻向目标基站发送上述序列号状态传输信息;或,在终端触发向目标基站的随机接入之前,该源基站向目标基站发送上述序列号状态传输信息。
结合第五方面及上述可能的实现方式,在第五方面的一种可能的实现方式中,上述序列号状态传输信息,至少可以表现为以下任意一种方式:
数值(英文为count)和偏移量(英文为offset);或,
源基站预留的最后一个下行数据的编号。故,目标基站可以根据该最后一个下行数据的编号,选择目标基站向终端首次发送下行数据的编号。
结合第五方面及上述可能的实现方式,在第五方面的一种可能的实现方式中,当终端成功接入目标基站后,该源基站向目标基站发送该源基站实际向终端发送的最后一个下行数据的编号。
因此,在切换过程中,终端可以分别经由源基站和目标基站,接收服务网关发送的下行数据,从而提高切换时的传输性能,进一步提高了用户体验。
第六方面提供一种基站,该基站包括:
发送单元,用于向终端发送切换命令,用于触发终端从该源基站向目标基站的切换过程;
处理单元,用于生成序列号状态传输信息;
该发送单元,还用于基于上述切换命令,向该目标基站发送序列号状态传输信息,指示用于该目标基站待分配的下行数据的起始编号。
结合第六方面,在第六方面的一种可能的实现方式中,该发送单元701还用于当终端成功接入目标基站后,向目标基站转发下行数据,用于目标基站向终端发送上述下行数据。
结合第六方面及上述可能的实现方式,在第六方面的一种可能的实现方式中,该发送单元还用于当终端成功接入目标基站后,向目标基站转发下行数据,用于目标基站向终端发送上述下行数据。
结合第六方面及上述可能的实现方式,在第六方面的一种可能的实现方式中,该发送单元还用于当终端成功接入目标基站后,向目标基站转发下行数据,用于目标基站向终端发送上述下行数据。
结合第六方面及上述可能的实现方式,在第六方面的一种可能的实现方式中,该发送单元,还可以用于:当终端成功接入目标基站后,向目标基站发送该源基站实际向终端发送的最后一个下行数据的编号。
因此,在切换过程中,终端可以分别经由源基站和目标基站,接收服务网关发送的下行数据,从而提高切换时的传输性能,进一步提高了用户体验。
第七方面提供一种基站,该基站包括处理器、存储器。其中,该存储器用于存储指令,该处理器用于执行该存储器存储的指令。
其中,该处理器:
用于向终端发送切换命令,用于触发终端从基站向目标基站的切换过程,该基站维持与终端间的用户数据的传输;
还用于在所切换过程中,当基站与终端之间用户数据的传输由维持转变成停止时,向终端发送第一状态报告,第一状态报告用于向终端指示,基站对终端的上行数据的接收状况。
结合第七方面,在第七方面的一种可能的实现方式中,上述基站还包括接收机和发射机。上述处理器执行存储器存储的指令,以控制接收机接收信
号,并控制发射机发送信号。上述接收机和/或发射机所执行的动作,由处理器触发执行。
其中,该发射机,用于向终端发送切换命令,用于触发终端从基站向目标基站的切换过程,该基站维持与终端间的用户数据的传输;
该发射机,还用于在所切换过程中,当基站与终端之间用户数据的传输由维持转变成停止时,基站向终端发送第一状态报告,第一状态报告用于向终端指示,基站对终端的上行数据的接收状况。
结合第七方面及上述可能的实现方式,在第七方面的一种可能的实现方式中,该接收机,用于在切换过程中,接收目标基站发送的接入指示,用于指示终端成功接入目标基站;
该发射机,具体包括:
在切换过程中,当接收机接收到目标基站发送的接入指示时,向终端发送第一状态报告。
结合第七方面及上述可能的实现方式,在第七方面的一种可能的实现方式中,该接收单元,用于在切换过程中,接收终端发送的切换指示,用于指示终端断开或即将断开与基站的连接;
该发射机具体用于:
在切换过程中,当接收机接收终端发送的切换指示时,向终端发送第一状态报告。
结合第七方面及上述可能的实现方式,在第七方面的一种可能的实现方式中,在接收机接收终端发送的切换指示后,接收机还用于:
接收终端发送的第二状态报告,第二状态报告用于向基站指示,终端的下行数据的接收状况。
结合第七方面及上述可能的实现方式,在第七方面的一种可能的实现方式中,在发射机向终端发送第一状态报告之后,该发射机还用于:
向目标基站发送序列号状态传输信息,用于向目标基站指示,基站对终端的上行数据的获取状况;
向目标基站转发获取的终端的上行数据。
结合第七方面及上述可能的实现方式,在第七方面的一种可能的实现方式中,基于接收机接收终端发送的第二状态报告,序列号状态传输信息,还用于向目标基站指示,基站对终端的下行数据的发送状况。
结合第七方面及上述可能的实现方式,在第七方面的一种可能的实现方式中,第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
结合第七方面及上述可能的实现方式,在第七方面的一种可能的实现方式中,RLC状态报告指示:
基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号;
PDCP状态报告指示:
基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
因而,能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
第八方面提供一种终端,该终端包括处理器、存储器。其中,该存储器用于存储指令,该处理器用于执行该存储器存储的指令。
其中,该处理器:
用于接收源基站发送的切换命令;
用于基于切换命令,触发从源基站向目标基站的切换过程,源基站维持与终端间的用户数据的传输;
还用于在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,接收源基站发送的第一状态报告,第一状态报告用于向终端指示,源基站对终端的上行数据的接收状况。
结合第八方面,在第八方面的一种可能的实现方式中,上述终端还包括接收机和发射机。上述处理器执行存储器存储的指令,以控制接收机接收信号,并控制发射机发送信号。上述接收机和/或发射机所执行的动作,由处理器触发执行。
其中,该接收机,用于接收源基站发送的切换命令;
该处理器,用于基于切换命令,触发从源基站向目标基站的切换过程,源基站维持与终端间的用户数据的传输;
该接收机,还用于在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,接收源基站发送的第一状态报告,第一状态报告用于向终端指示,源基站对终端的上行数据的接收状况。
结合第八方面及上述可能的实现方式,在第八方面的一种可能的实现方式中,在切换过程中,当源基站停止与终端间的用户数据的传输时,接收机具体用于:
在切换过程中,当源基站接收到目标基站发送的接入指示时,接收源基站发送的第一状态报告;
其中,接入指示,用于向源基站指示终端成功接入目标基站。
结合第八方面及上述可能的实现方式,在第八方面的一种可能的实现方式中,该发送机,用于在切换过程中,向源基站发送切换指示,用于指示终端断开或即将断开与源基站的连接;
在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,终端接收源基站发送的第一状态报告,该接收机,具体用于:
在切换过程中,基于终端发送的切换指示,接收源基站发送的第一状态报告。
结合第八方面及上述可能的实现方式,在第八方面的一种可能的实现方式中,在发射机向源基站发送切换指示后,发射机还用于:
源基站发送第二状态报告,第二状态报告用于向源基站指示,终端的下行数据的接收状况。
结合第八方面及上述可能的实现方式,在第八方面的一种可能的实现方式中,第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
结合第八方面及上述可能的实现方式,在第八方面的一种可能的实现方式中,RLC状态报告指示:
源基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号;
PDCP状态报告指示:
源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
因而,能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
基于上述技术方案,本发明实施例提供的传输方法,合理调整了切换过程中用户数据的传输方式。因此,本发明实施例提供的方法,相对于现有技术,一定程度上能够保证用户数据的有效传输,提高传输效率,提升用户体验。
为了更清楚地说明本发明实施例的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。
图1示出本发明实施例的应用场景的示意图。
图2示出了根据本发明实施例的切换过程的示意性流程图。
图3示出了根据本发明实施例提供的传输方法的示意性流程图。
图3A示出了根据本发明实施例提供的传输方法的另一示意性流程图。
图4示出了根据本发明实施例提供的传输方法的再一示意性流程图。
图5示出了根据本发明实施例提供的基站的示意性框图。
图6示出了根据本发明实施例提供的用户设备的另一示意性框图。
图7示出了根据本发明实施例提供的基站的再一示意性框图。
图8示出了根据本发明实施例提供的网络设备的示意性框图。
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
还应理解,在本发明实施例中,用户设备(User Equipment,简称为“UE”)也可称之为终端、移动台(Mobile Station,简称为“MS”)、移动终端(Mobile Terminal)等,该用户设备可以经无线接入网(Radio Access Network,简称为“RAN”)与一个或多个核心网进行通信,例如,用户设备可以是移动电话(或称为“蜂窝”电话)、具有移动终端的计算机等,例如,用户设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置,它们与无线接入网交换语言和/或数据。本发明实施例对此并不限定,但为描述方便,下述实施例将以终端为例进行说明。
在本发明实施例中,基站可以是GSM中的基站(Base Transceiver Station,简称为“BTS”),也可以是WCDMA中的基站(NodeB,简称为“NB”),还可以是LTE中的演进型基站(Evolved Node B,简称为“eNB或e-NodeB”),本发明实施例并不限定,但为描述方便,下述实施例将以基站为例进行说明。
随着移动通信系统的快速发展,移动通信系统能够提供的服务质量越来越高。为保持第三代合作伙伴计划(the 3rd Generation Partner Project,简称为“3GPP”)的长期竞争优势,进一步提高移动通信系统的频谱效率和用户吞吐量,载波聚合(Carrier Aggregation,简称为“CA”)技术作为一种新技术被引入到长期演进升级版(LTE-Advanced,简称为“LTE-A”)标准中。在载波聚合技术中,用户设备(User Equipment,简称为“UE”)可以同时使用多个小区进行上下行通信,从而支持高速数据传输。长期演进(Long Term Evolution,简称为“LTE”)系统的载波聚合可以分为基站内小区聚合、基站间小区聚合等。其中,基站内小区聚合是指对于一个UE而言,聚合的服务小区都属于同一个基站。由于聚合的服务小区只受一个基站控制,因此,相对而言基站内小区聚合比较简单。正在制订的第12版本(Release-12)引入了基站间小区聚合,也称之为双连接(Dual Connectivity,简称为“DC”)。DC支持两个基站下的多个小区进行载波聚合,因而能够给用户带来更好的用户体验。在基站间小区聚合技术中,对一个终端而言,其中一个基站为主基站(Master eNB,简称为“MeNB”),其它的基站为辅基站(Secondary eNB,
简称为“SeNB”),主基站承担更多的控制功能,一般是宏基站,而辅基站一般是小基站。
本发明实施例的切换过程,可以应用于单载波场景、基站内小区聚合场景、双连接场景。如,基于单载波场景,在切换发生时,终端与一个服务小区保持连接。又如,以双连接场景为例,在切换发生时,终端与至少两个基站连接。又如,以基站内小区聚合场景为例,在切换发生时,终端与同一个基站下的至少两个小区连接。
本发明实施例对此并不限定,即本发明实施例同样适用于基站内的切换和基站间的切换。但为描述方便,下述实施例将以基站间的切换为例进行说明。
为了便于理解和描述本发明实施例提供的上行数据的传输方法和用户设备,下面首先介绍一下本发明实施例的应用场景。
图1示出了本发明实施例应用于LTE系统的示意图。如图1所示,在该LTE系统中,基站11和基站12负责无线接口的无线资源管理、连接控制、小区管理和调度等,基站11和基站12可以通过X2接口进行通信连接,并可以分别通过S1接口与移动性管理实体(Mobility Management Entity,简称为“MME”)/服务网关(Serving GateWay,简称为“SGW”)14进行通信连接;此外,基站11和基站12还可以分别通过Uu接口与终端13进行通信连接。
应理解,本发明实施例仅以LTE系统为例进行说明,但本发明并不限于此,根据本发明实施例的技术方案还可以应用于其它通信系统,例如,LTE-A系统等。还应理解,图1所示的LTE系统以一个终端和两个基站为例进行说明,但该LTE系统还可以包括更多数量的终端和基站。
图2示出了切换过程的基本流程,在该示例中,包括终端、源基站和目标基站。该切换过程的步骤如下:
201、源基站向目标基站发送切换请求(英文为handover request,简称为HO request)。
可理解,上述切换请求可以请求目标基站接纳该终端的切换。
可选的,基于上述切换请求,目标基站向源基站发送切换请求确认(英文为handover request acknowledge,简称为HO request ACK)。
202、源基站向终端发送切换命令(英文为handover command,简称为
HO command)。
可理解,上述切换命令可用于触发终端向目标基站的切换。
206、终端向目标基站发送切换完成信息。
可理解,终端可以通过随机接入过程获取上行资源,向目标基站发送上述切换完成信息。
例如,上述切换过程,还可以包括:
204、终端触发向目标基站的随机接入(英文为random access)。
可理解,上述随机接入用于终端成功接入目标基站,实现向目标基站的切换。
在本发明实施例中,上述随机接入可以通过竞争或非竞争方式实现终端最终接入目标基站。
以竞争的随机接入为例,终端向目标基站发送随机接入前导(英文为random access preamble)。目标基站基于该随机接入前导,向该终端回传随机接入响应(英文为random access response),其包含向终端分配的上行授权(英文为uplink grant)和定时同步信息(英文为timing alignment information)。该定时同步信息用于实现终端与目标基站的上行同步。
可理解,终端可以通过随机接入响应中的上行授权获取上行资源,向目标基站发送上述切换完成信息。
在本发明实施例中,还可以通过以下任意一种方式,获取上行资源:
目标基站周期性地向终端分配上行资源;或
源基站将上行资源携带在切换命令中,发送给终端。
以下先描述终端向网络发送上行数据的场景,该网络可以理解为至少包括源基站,和/或,目标基站。
以上行数据为例,上述切换过程还可以包括:
208、源基站向目标基站转发终端发送的上行数据。
可理解,在下行数据传输过程中,源基站可以向目标基站转发源基站无法确认终端是否接收到的下行数据。
在本发明实施例中,在上述201至204,201至206、或201至208前的任意时间段中,终端和源基站可以保持通信,即终端和源基站间可以互传上下行用户数据。从208开始,目标基站可以通过下述两种方式获取终端的上
行数据:
方式一、源基站的转发,目标基站获取终端的上行数据,该上行数据可以为在切换前或切换期间,源基站从终端获取的上行数据。
方式二、目标基站通过直接调度终端,例如目标基站指示终端向其发送上行数据,终端可以自行确定并向目标基站发送,该上行数据可以为在切换前或切换期间,终端向源基站发送的但尚未收到源基站反馈确认(英文为acknowledge)的上行数据。
具体而言,在一般通信流程中,以上行为例,当终端向基站发送了上行数据后,基站若正确接收,则基站会向终端通过确认模式(英文为acknowledge mode)通知终端。当终端接收基站发送的确认信息(英文为acknowledge,简称ACK),终端会继续进行上行新传;当终端接收基站发送的未确认信息(英文为non-acknowledge,简称为NACK)时,终端会进行上行重传。
但是,由于ACK/NACK传输不可靠,故无法作为数据传输是否成功的最终判断。因此,以上行为例,在传输过程中,基站作为接收方会不定期发送状态报告给终端,来指示终端哪些数据收到了,哪些数据还未收到。由于状态报告是不定期发送的,源基站和终端间互传的上下行用户数据,无法通过上述状态报告实时通知对端是否正确接收。因而,针对切换过程,终端和源基站即便保持着用户数据的通信,但均无法实时获悉对端是否正确接收。
此时,存在一种可能性,通过方式二终端直接向目标基站传输的可以是源基站已经收到但尚未向终端反馈确认的上行数据,而该上行数据又可以通过方式一经由源基站向目标基站转发。可知,基于上述两种方式,存在终端和源基站向目标基站重复传输终端的上行数据的情况,造成了目标基站获取终端的上行数据的冗余,从而影响了上行数据传输效率。
针对上述技术问题,本发明实施例提供一种传输方法,能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
图3示出了根据本发明实施例提供的一种传输方法300,具体地,该方法300由源基站执行,该方法300包括:
301、源基站向终端发送切换命令,用于触发该终端从该源基站向目标基站的切换过程。
302、在该切换过程中,当该源基站与该终端间用户数据的传输由维持
转变成停止时,该源基站向该终端发送第一状态报告,该第一状态报告用于向该终端指示,该源基站对该终端的上行数据的接收状况。
在本发明实施例中,源基站向终端发送的步骤/动作,可以理解为终端接收源基站发送的步骤/动作。如图3A所示,上述301和302从终端的角度可以诠释为:
301’、终端接收源基站发送的切换命令。
302’、基于该切换命令,终端触发从源基站向目标基站的切换过程。
303’、在该切换过程中,当该源基站与该终端间用户数据的传输由维持转变成停止时,该终端接收该源基站发送的第一状态报告,该第一状态报告用于向该终端指示,该源基站对该终端的上行数据的接收状况。
在本发明实施例中,涉及终端和基站间信令、数据的传输,均可分别从发送方或接收方理解,以下不再赘述。以下行为例,发送方为基站,接收方为终端;以上行为例,发送方为终端,接收方为基站。
可选的,切换过程可以理解为从源基站向终端发送切换命令开始,直至源基站向目标基站转发用户数据为止。可理解,在上述切换过程中,源基站在一段时间内可以维持与终端间的用户数据的传输,其后源基站与终端之间可以停止用户数据的传输。
在本发明实施例中,源基站向终端发送切换命令的前提可以是,源基站已经向目标基站发送了切换请求,并接收到目标基站的切换响应。
可理解,上述切换命令可以包括由无线资源控制(英文为radio resource control,简称为RRC)消息携带的移动控制信息(英文为mobility control information)。
在本发明实施例中,上述源基站与终端由维持用户数据的传输转变成停止用户数据的传输,可以理解为在切换过程中,源基站在某时候段内与终端保持上下行用户数据的通信。然而,从之后的某时间点开始,源基站停止与该终端的上下行用户数据传输。或者,源基站预设一个定时器,在该定时器超期时,源基站认为终端即将断开与源基站的连接。本发明实施例对源基站与终端间的用户数据通信维持至终止的具体设定方式不作限定。
在本发明实施例中,上述第一状态报告可以指示源基站从终端接收到的上行数据,和/或,源基站未能从终端接收到的上行数据。
例如,该第一状态报告可以指示源基站下一个未接收到的终端的上行数
据;或,指示源基站第一个丢失的上行数据。又如,该第一状态报告可以指示源基站接收到的最后一个终端上行数据;或,指示源基站最后一个未丢失的上行数据。
可理解,上述第一状态报告中指示的上行数据可表示为该上行数据对应的序列号(英文为sequence numbe,简称SN)或数值(英文为count)。当该第一状态报告为无线链路控制(英文为radio link control,简称RLC)状态报告时,该RLC状态报告指示,源基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号。当该第一状态报告为分组数据汇聚协议(英文为packet data convergence protocol,简称PDCP)状态报告时,该PDCP状态报告指示,源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号。例如,源基站发送的是RLC状态报告,终端可以根据接收到的RLC状态报告、RLC序号与PDCP序号的对应关系,获悉哪些上行数据(例如PDCP数据包)已经由源基站成功接收。又如,源基站发送的是PDPC状态报告,则终端可以直接根据该第一状态报告获知哪些上行数据(例如PDCP数据包)已经由源基站成功接收。
可理解,在空口传输,例如终端和基站间的通信,对应用户数据的序列号较为常用。在X2口传输,例如源基站和目标基站间的通信,对应用户数据的数值更为常用。本发明对上行数据在第一状态报告中的具体指示、标识不作限定。
在本发明实施例中,上述方法还可以包括在切换过程中,源基站接收目标基站发送的接入指示,用于指示终端成功接入目标基站。
例如,当基于终端向目标基站发送随机接入前导,触发竞争/非竞争随机接入后,终端通过目标基站发送的随机接入响应,获取可以发送切换完成消息的上行资源和实现与目标上行同步的定时同步信息。终端向目标基站发送切换完成消息。此时,目标基站可以向源基站发送终端成功接入的接入指示,标志着终端完成从源基站向目标基站的切换。
在本发明实施例中,上述方法还可以包括在切换过程中,源基站接收终端发送的切换指示,用于指示该终端断开或即将断开与源基站的连接。
可理解,终端向源基站发送该切换指示的时机一般在终端发起随机接入过程之前。当终端向源基站发送该切换指示后,终端可以断开与源基站的连接,与目标基站进行随机接入。具体的,当终端发送切换指示后,一方面,
终端不会再向源基站发送上行数据;另一方面,终端会通知源基站不再接收源基站发送的下行数据,用于源基站停止向终端发送下行数据。
可理解,上述源基站向终端发送第一状态报告的条件可以为以下任意一种:
条件a、在上述切换过程中,当源基站接收到目标基站发送的接入指示时,源基站向终端发送第一状态报告;或,
条件b、在上述切换过程中,当源基站接收终端发送的切换指示时,该源基站向终端发送第一状态报告。
条件c、当源基站的定时器超时时,源基站向终端发送第一状态报告。
基于条件c,源基站可以在发送切换命令后,启动定时器,。在该定时器超时后,源基站认为终端即将断开与源基站的连接,源基站向终端发送第一状态报告。可选地,源基站向终端周期性发送第一状态报告。上述周期定时器的时长可以由基站自行决定。比如,源基站预估终端将断开与源基站的连接的时长,将该时长作为上述定时器的时长。例如,该周期定时器的时长可以为10毫秒,当超出10毫秒后,就触发源基站向终端发送第一状态报告。
在本发明实施例中,在源基站向终端发送第一状态报告之后,上述方法还可以包括:
该源基站向该目标基站发送序列号状态传输(英文为sequence status transfer,简称SN status transfer)信息,用于向该目标基站指示,该源基站对该终端的上行数据的接收状况;
该源基站向该目标基站转发获取的该终端的上行数据。
本发明实施例中,上述序列号状态传输信息可以指示源基站从终端接收到的上行数据,和/或,源基站未能从终端接收到的上行数据。
例如,该序列号状态传输信息可以指示源基站下一个未接收到的终端上行数据;或,指示源基站第一个丢失的上行数据。又如,该第一状态报告可以指示源基站接收到的最后一个终端上行数据;或,指示源基站最后一个未丢失的上行数据。
可理解,上述序列号状态传输信息可以包括源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号。
可理解,序列号状态传输信息的作用是源基站告诉目标基站,源基站从终端获取的上行数据的情况。随后,通过上行数据转发,源基站向目标基站
发送已经从终端获取的上行数据,这些上行数据可能终端已经发送给源基站了,但是终端尚未收到源基站的确认。期间,目标基站会直接调度终端的上行数据,触发终端向目标基站再次发送上述上行数据。在现有技术中,会造成源基站和终端向目标基站重复发送相同的上行数据。
本发明实施例中,一旦源基站与终端在切换过程中的用户数据传输终止,源基站会及时向终端发送第一状态报告,终端能根据接收到的第一状态报告更早获知哪些上行数据已经被源基站成功接收,因而终端不再向目标基站发送同样的上行数据,提高了上行数据的传输效率。
可选的,在源基站接收终端发送的切换指示后,上述方法还包括:
源基站接收终端发送的第二状态报告,该第二状态报告用于向源基站指示,该终端的下行数据的接收状况。
可选地,在终端即将断开与源基站的连接时,终端向源基站发送第二状态报告。源基站接收该终端发送的第二状态报告,该第二状态报告用于向源基站指示,该终端的下行数据的接收状况。
可选地,该第二状态报告可以是RLC状态报告或PDCP状态报告。
可理解,通过上述第二状态报告,源基站可以获悉终端是否成功接收到该源基站发送的下行数据。该第二状态报告可以包括以下任意一种:
当该第二状态报告为RLC状态报告时,该终端下一个未接收到的下行数据的序列号和该序列号之前的所有的未接收到的下行数据的序列号;或,
当该第二状态报告为PDCP状态报告时,该终端第一丢失的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
可选的,基于上述第二状态报告,源基站向目标基站发送的上述序列号状态传输信息,还用于向目标基站指示,源基站对终端的下行数据的发送状况。
在本发明实施例中,基于上述第二状态报告,源基站向目标基站可以更为准确地指示源基站对终端的下行数据的发送状况。此后,目标基站向终端转发的下行数据中,不包括终端已经成功接收到的源基站的下行数据,从而可以进一步提高下行数据的传输效率。
可理解,虽然本发明实施例描述的是涉及基站间切换过程的传输方法,但同样适用于基站内切换过程的传输方法。区别在于,基站内切换的传输方法,不涉及源基站和目标基站,而是同一个基站下不同小区间的切换。故,
基于切换过程,基站内切换的传输方法比基站间的传输方法可以进一步省略源基站和目标基站间的信令交互,因而更为节省系统开销。
本发明的又一实施例重点描述网络向终端发送下行数据的场景,该网络至少可以包括源基站,和/或,目标基站。
在该实施例中,结合图2的描述,在201至204、201至206、或201至208前的任意时间段中,终端和源基站可以保持用户数据通信。
现有技术中,目标基站在208之后,开始向终端发送下行数据。因而,就下行而言,在切换过程中,终端只能单独从源基站获取下行数据,而无法从目标基站获取下行数据,从而降低了终端的吞吐量,影响了切换过程中下行数据传输效率。
针对上述技术问题,本发明实施例提供了一种下行数据的传输方法,能够有效提升在切换过程中,下行数据的传输效率。
图4示出了根据本发明另一实施例提供的一种下行数据的传输方法400,例如,该传输方法400可以由源基站执行,该方法400包括:
401、源基站向终端发送切换命令,用于触发终端从该源基站向目标基站的切换过程。
403、基于上述切换命令,该源基站向该目标基站发送序列号状态传输信息,指示用于该目标基站待分配的下行数据的起始编号。
可理解,上述401可参看图3相关实施例的描述,在此不再赘述。
在本发明实施例中,上述方法还包括:
在切换过程中,根据上述序列号状态传输信息,目标基站向终端发送从服务网关获取的下行数据。
因此,在切换过程中,终端可以分别从源基站和目标基站获取服务网关发送的下行数据,提升了下行传输效率。
在本发明实施例中,上述方法还可以包括:
当终端成功接入目标基站后,该源基站向目标基站转发下行数据,用于目标基站向终端发送上述下行数据。
具体的,上述转发的下行数据可以为,源基站尚未向终端发送的下行数据。
将源基站向目标基站的下行用户数据延后转发,可以进一步避免目标基
站在切换过程中,向终端重复发送,终端已经从源基站成功获取的下行数据,进一步提升下行数据的传输效率。
在本发明实施例中,源基站基于切换命令,向目标基站发送序列号状态传输信息,具体可以为满足以下任一条件:
条件一、当源基站向终端发送上述切换命令后,该源基站即刻向目标基站发送上述序列号状态传输信息;或,
条件二、在终端触发向目标基站的随机接入之前,该源基站向目标基站发送上述序列号状态传输信息。
具体的,上述序列号状态传输信息,至少可以表现为以下任意一种方式:
方式一、数值(英文为count)和偏移量(英文为offset)。
可理解,该数值用于指示源基站下一个未分配的编号。该偏移量用于指示源基站预留的用于自身发送下行数据的编号。故,目标基站可以根据该数值和偏移量,选择目标基站向终端首次发送下行数据的编号。具体的,由于在序列号状态传输信息中需要向目标基站指示,目标基站待向终端传输的下行数据的起始数值。该起始数值可以为目标基站从特定的数值开始分配编号。因为在切换过程中,源基站还需要继续分配向终端发送下行数据的编号,因而源基站还会保留一定数量(假设取值为offset)的编号,即源基站会空出一段编号自行使用。所以,在源基站发送给目标基站的SN status transfer中,可以携带源基站保留的编号个数以及源基站下一个要分配的编号。当目标基站需要向终端发送下行数据时,目标基站会向该下行数据分配编号,例如从源基站下一个要分配的编号及源基站保留的编号个数之和开始分配,用于目标基站下一个要传输的下行数据所对应的编号。
例如,源基站已经分配的最后一个编号为5,源基站下一个未分配的编号即为6。此时,源基站向目标基站发送的序列号状态传输信息包括count为6,偏移量为10。此时,目标基站根据获取的序列号状态传输信息,从10+6=16,即编号16开始分配给对应的下行数据。
方式二、源基站预留的最后一个下行数据的编号。故,目标基站可以根据该最后一个下行数据的编号,选择目标基站向终端首次发送下行数据的编号。
具体的,在源基站发送给目标基站的SN status transfer消息中,直接携带目标基站下一个要分配的编号,该编号是源基站下一个要分配的编号及源
基站保留的编号个数之和。故,目标基站可以从该目标基站下一个要分配的编号开始发送下行数据。
本发明实施例中,上述编号可以表示为PDCP序列号。
在本发明实施例中,上述方法还可以包括:
当终端成功接入目标基站后,该源基站向目标基站发送该源基站实际向终端发送的最后一个下行数据的编号。
具体的,对于源基站保留的offset,存在以下两种情况:
情况一、源基站没有使用完上述offset;或,
情况二、对于上述offset,源基站并不够用。例如,源基站发送SN status transfer后,从服务网关收到的下行数据所需要的编号大于offset。因而,对于offset之后的下行数据,源基站没有编号可分配。
对于情况一,源基站在收到目标基站发送的接入指示后,向目标基站发送源基站的保留编号的使用情况。例如,保留编号已被分配的个数;或,剩下的未被分配的编号个数;或,最后一个分配的数值;或,未使用的数值区间,等。目标基站可以将上述情况转发给终端,故而终端可以据此在按序递送时,跳过这个未使用的数值区间。
对于情况二,未被分配编号的下行数据不能通过源基站发送,源基站将这些未分配编号的下行数据转发data forwarding给目标基站,通过目标基站发送给终端。
本发明实施例中,目标基站能在切换过程中,向终端发送从服务网关接收到的下行数据,从而提高切换时的传输性能,进一步提高了用户体验。
可理解,虽然本发明实施例描述的是涉及基站间切换过程的传输方法,但同样适用于基站内切换过程的传输方法。区别在于,基站内切换的传输方法,不涉及源基站和目标基站,而是同一个基站。故,基于切换过程,基站内的传输方式比基站间的传输方法可以进一步省略源基站和目标基站间的信令交互,因而更为节省系统开销。
上文中结合图1至图4,详细描述了根据本发明实施例的传输方法,下面将结合图5至图7,描述根据本发明实施例的终端和基站。
图5示出了根据本发明实施例的基站500的示意性框图,该基站可以为源基站,该基站500包括:
发送单元501,用于向终端发送切换命令,用于触发终端从基站向目标基站的切换过程;
处理单元502,用于维持该基站与终端间的用户数据的传输;
发送单元501,还用于在该切换过程中,当基站与终端之间用户数据的传输由维持转变成停止时,向终端发送第一状态报告,该第一状态报告用于向终端指示,该基站对终端的上行数据的接收状况。
可选的,上述基站500还可以包括:
接收单元503,用于在切换过程中,接收目标基站发送的接入指示,用于指示终端成功接入目标基站;
上述发送单元501,具体包括:
在切换过程中,当接收单元接收到目标基站发送的接入指示时,向终端发送第一状态报告。
可选的,上述接收单元503,可以用于在切换过程中,接收终端发送的切换指示,用于指示终端断开或即将断开与基站的连接;
上述发送单元501,具体包括:
在切换过程中,当接收单元接收终端发送的切换指示时,向终端发送第一状态报告。
本发明实施例中,一旦源基站与终端在切换过程中的用户数据传输终止,源基站会及时向终端发送第一状态报告,终端能根据接收到的第一状态报告更早获知哪些上行数据已经被源基站成功接收,因而终端不再向目标基站发送同样的上行数据,提高了上行数据的传输效率。
可选的,在接收单元503接收终端发送的切换指示后,该接收单元503还用于:
接收终端发送的第二状态报告,第二状态报告用于向基站指示,终端的下行数据的接收状况。
可选的,上述发送单元501还用于:
向目标基站发送序列号状态传输信息,用于向目标基站指示,基站对终端的上行数据的获取状况;
向目标基站转发获取的终端的上行数据。
可理解,上述序列号状态传输信息可以包括源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号。
可选的,基于接收单元503接收该终端发送的第二状态报告,序列号状态传输信息,还用于向目标基站指示,基站对终端的下行数据的发送状况。
在本发明实施例中,基于上述第二状态报告,源基站向目标基站可以更为准确地指示源基站对终端的下行数据的发送状况。此后,目标基站向终端转发的下行数据中,不包括终端已经成功接收到的源基站的下行数据,从而可以进一步提高下行数据的传输效率。
可选的,第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
可选的,上述RLC状态报告指示:
基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号。
可选的,上述PDCP状态报告指示:
基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
因而,本发明实施例能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
应理解,根据本发明实施例的基站500可对应于本发明实施例的传输方法的源基站,并且上述基站500中的各个模块的上述和其它操作和/或功能分别为了实现图1至图4中的各个方法的相应流程,为了简洁,在此不再赘述。
图6示出了根据本发明实施例的终端600的示意性框图,该终端600包括:
接收单元601,用于接收源基站发送的切换命令;
处理单元603,用于基于切换命令,触发从源基站向目标基站的切换过程,并维持与源基站间的用户数据的传输;
该接收单元601,还用于在切换过程中,当源基站与终端之间用户数据
的传输由维持转变成停止时,接收源基站发送的第一状态报告,第一状态报告用于向终端指示,源基站对终端的上行数据的接收状况。
可选的,在切换过程中,当源基站停止与终端间的用户数据的传输时,该接收单元601具体用于:
在切换过程中,当源基站接收到目标基站发送的接入指示时,接收源基站发送的第一状态报告;
其中,该接入指示用于向源基站指示终端成功接入目标基站。
可选的,该终端600还包括发送单元605,用于:
在切换过程中,向源基站发送切换指示,用于指示终端断开或即将断开与源基站的连接;
在切换过程中,当源基站与终端之间用户数据的传输由维持转变成停止时,终端接收源基站发送的第一状态报告,该接收单元601,具体用于:
在切换过程中,接收源基站基于该切换指示发送的第一状态报告。
本发明实施例中,一旦源基站与终端在切换过程中的用户数据传输终止,源基站会及时向终端发送第一状态报告,终端能根据接收到的第一状态报告更早获知哪些上行数据已经被源基站成功接收,因而终端不再向目标基站发送同样的上行数据,提高了上行数据的传输效率。
可选的,在发送单元605向源基站发送切换指示后,该发送单元605还用于:
向源基站发送第二状态报告,第二状态报告用于向源基站指示,终端的下行数据的接收状况。
在本发明实施例中,基于上述第二状态报告,源基站向目标基站可以更为准确地指示源基站对终端的下行数据的发送状况。此后,目标基站向终端转发的下行数据中,不包括终端已经成功接收到的源基站的下行数据,从而可以进一步提高下行数据的传输效率。
可选的,该第一状态报告或第二状态报告为以下任一种:
无线链路控制(RLC)状态报告;或
分组数据汇聚协议(PDCP)状态报告。
可选的,该RLC状态报告指示:
该源基站下一个未接收到的上行数据的序列号和该序列号之前的所有未接收到的上行数据的序列号;或,
该终端下一个未接收到的下行数据的序列号和该序列号之前的所有未接收到的下行数据的序列号。
可选的,该PDCP状态报告指示:
源基站第一个丢失的上行数据的序列号和从该序列号开始的未接收到的上行数据的序列号;或,
终端下一个未接收到的下行数据的序列号和从该序列号开始的未接收到的下行数据的序列号。
因而,本发明实施例能够有效提升用户数据的传输效率,降低基站的处理负荷,并减少系统的信令开销。
应理解,根据本发明实施例的终端600可对应于本发明实施例的传输方法的终端,并且上述终端600中的各个模块的上述和其它操作和/或功能分别为了实现图1至图4中的各个方法的相应流程,为了简洁,在此不再赘述。
图7示出了根据本发明实施例的基站700的示意性框图,该基站可以为源基站,该基站700包括:
发送单元701,用于向终端发送切换命令,用于触发终端从该源基站向目标基站的切换过程;
处理单元703,用于生成序列号状态传输信息,指示用于该目标基站待分配的下行数据的起始编号;
该发送单元701,还用于基于上述切换命令,向该目标基站发送序列号状态传输信息。
因此,在本发明实施例的切换过程中,终端可以分别从源基站和目标基站获取服务网关发送的下行数据,提升了下行传输效率。
可选的,该发送单元701还用于当终端成功接入目标基站后,向目标基站转发下行数据,用于目标基站向终端发送上述下行数据。
将源基站向目标基站的下行用户数据延后转发,可以进一步避免目标基站在切换过程中,向终端重复发送,终端已经从源基站成功获取的下行数据,进一步提升下行数据的传输效率。
在本发明实施例中,源基站基于切换命令,向目标基站发送序列号状态传输信息,具体可以为满足以下任一条件:
条件一、当源基站向终端发送上述切换命令后,该源基站即刻向目标基
站发送上述序列号状态传输信息;或,
条件二、在终端触发向目标基站的随机接入之前,该源基站向目标基站发送上述序列号状态传输信息。
具体的,上述序列号状态传输信息,至少可以表现为以下任意一种方式:
方式一、数值(英文为count)和偏移量(英文为offset)。
可理解,该数值用于指示源基站下一个未分配的编号。该偏移量用于指示源基站预留的用于自身发送下行数据的编号。故,目标基站可以根据该数值和偏移量,选择目标基站向终端首次发送下行数据的编号。具体的,由于在序列号状态传输信息中需要向目标基站指示,目标基站待向终端传输的下行数据的起始数值。该起始数值可以为目标基站从特定的数值开始分配编号。因为在切换过程中,源基站还需要继续分配向终端发送下行数据的编号,因而源基站还会保留一定数量(假设取值为offset)的编号,即源基站会空出一段编号自行使用。所以,在源基站发送给目标基站的SN status transfer中,可以携带源基站保留的编号个数以及源基站下一个要分配的编号。当目标基站需要向终端发送下行数据时,目标基站会向该下行数据分配编号,例如从源基站下一个要分配的编号及源基站保留的编号个数之和开始分配,用于目标基站下一个要传输的下行数据所对应的编号。
例如,源基站已经分配的最后一个编号为5,源基站下一个未分配的编号即为6。此时,源基站向目标基站发送的序列号状态传输信息包括count为6,偏移量为10。此时,目标基站根据获取的序列号状态传输信息,从10+6=16,即编号16开始分配给对应的下行数据。
方式二、源基站预留的最后一个下行数据的编号。故,目标基站可以根据该最后一个下行数据的编号,选择目标基站向终端首次发送下行数据的编号。
具体的,在源基站发送给目标基站的SN status transfer消息中,直接携带目标基站下一个要分配的编号,该编号是源基站下一个要分配的编号及源基站保留的编号个数之和。故,目标基站可以从该目标基站下一个要分配的编号开始发送下行数据。
本发明实施例中,上述编号可以表示为PDCP序列号。
在本发明实施例中,上述方法还可以包括:
当终端成功接入目标基站后,该源基站向目标基站发送该源基站实际向
终端发送的最后一个下行数据的编号。
可选的,上述发送单元701,还可以用于:当终端成功接入目标基站后,向目标基站发送该源基站实际向终端发送的最后一个下行数据的编号。
本发明实施例中,实现在切换过程中,终端可以分别经由源基站和目标基站,接收服务网关发送的下行数据,从而提高切换时的传输性能,进一步提高了用户体验。
应理解,根据本发明实施例的基站700可对应于本发明实施例的传输方法的源基站,并且上述基站700中的各个模块的上述和其它操作和/或功能分别为了实现图1至图4中的各个方法的相应流程,为了简洁,在此不再赘述。
上述装置实施例中的终端和/或基站还可以分别进一步包括存储器或总线系统。其中,处理器、存储器、接收机和发射机通过总线系统相连,该存储器用于存储指令,该处理器用于执行该存储器存储的指令,以控制接收机接收信号,并控制发射机发送信号。例如,上述实施例中的接收单元的动作可以由接收机执行,发送单元的动作可以由发射机执行,处理单元的动作可以由处理器执行。
如图8所示,以网络设备800为例,该网络设备800可以为上述实施例中的基站或终端,包括处理器801,接收机802,存储器803、发射机804和总线805。
应理解,在本发明实施例中,该处理器可以是中央处理单元(Central Processing Unit,简称为“CPU”),该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器可以包括只读存储器和随机存取存储器,并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如,存储器还可以存储设备类型的信息。
该总线系统除包括数据总线之外,还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见,在本发明实施例中,将各种总线都称为总线系统。
在实现过程中,上述方法的各步骤可以通过处理器中的硬件的集成逻辑
电路或者软件形式的指令完成。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成,或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器,闪存、只读存储器,可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器,处理器读取存储器中的信息,结合其硬件完成上述方法的步骤。为避免重复,这里不再详细描述。
还应理解,本文中涉及的第一、第二等各种数字编号仅为描述方便进行的区分,并不用来限制本发明实施例的范围。
应理解,本文中术语“和/或”,仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况。另外,本文中字符“/”,一般表示前后关联对象是一种“或”的关系。
应理解,在本发明的各种实施例中,上述各过程的序号的大小并不意味着执行顺序的先后,各过程的执行顺序应以其功能和内在逻辑确定,而不应对本发明实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,上述描述的系统、装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。
在本申请所提供的几个实施例中,应该理解到,所揭露的系统、装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作
为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,在本发明各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(ROM,Read-Only Memory)、随机存取存储器(RAM,Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以所述权利要求的保护范围为准。
Claims (28)
- 一种传输方法,其特征在于,包括:源基站向终端发送切换命令,用于触发所述终端从所述源基站向目标基站的切换过程,所述源基站维持与所述终端间的用户数据的传输;在所述切换过程中,当所述源基站与所述终端之间用户数据的传输由维持转变成停止时,所述源基站向所述终端发送第一状态报告,所述第一状态报告用于向所述终端指示,所述源基站对所述终端的上行数据的接收状况。
- 如权利要求1所述的方法,其特征在于,还包括:在所述切换过程中,所述源基站接收所述目标基站发送的接入指示,用于指示所述终端成功接入所述目标基站;在所述切换过程中,当所述源基站与所述终端之间的用户数据的传输由维持变成停止时,所述源基站向所述终端发送第一状态报告,具体包括:在所述切换过程中,当所述源基站接收到所述目标基站发送的所述接入指示时,所述源基站向所述终端发送所述第一状态报告。
- 如权利要求1所述的方法,其特征在于,还包括:在所述切换过程中,所述源基站接收所述终端发送的切换指示,用于指示所述终端断开或即将断开与所述源基站的连接;在所述切换过程中,当所述源基站与所述终端之间用户数据的传输由维持转变成停止时,所述源基站向所述终端发送第一状态报告,具体包括:在所述切换过程中,当所述源基站接收所述终端发送的所述切换指示时,所述源基站向所述终端发送所述第一状态报告。
- 如权利要求3所述的方法,其特征在于,在所述源基站接收所述终端发送的切换指示后,还包括:所述源基站接收所述终端发送的第二状态报告,所述第二状态报告用于向所述源基站指示,所述终端的下行数据的接收状况。
- 如权利要求1至3任一项所述的方法,其特征在于,在所述源基站向所述终端发送所述第一状态报告之后,还包括:所述源基站向所述目标基站发送序列号状态传输信息,用于向所述目标基站指示,所述源基站对所述终端的上行数据的获取状况;所述源基站向所述目标基站转发获取的所述终端的上行数据。
- 如权利要求5所述的方法,其特征在于:基于所述源基站接收所述终端发送的所述第二状态报告,所述序列号状态传输信息,还用于向所述目标基站指示,所述源基站对所述终端的下行数据的发送状况。
- 如权利要求4至6任一项所述的方法,其特征在于:所述第一状态报告或第二状态报告为以下任一种:无线链路控制(RLC)状态报告;或分组数据汇聚协议(PDCP)状态报告。
- 如权利要求7所述的方法,其特征在于:所述RLC状态报告指示:所述源基站下一个未接收到的上行数据的序列号和所述序列号之前的所有未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和所述序列号之前的所有未接收到的下行数据的序列号;所述PDCP状态报告指示:所述源基站第一个丢失的上行数据的序列号和从所述序列号开始的未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和从所述序列号开始的未接收到的下行数据的序列号。
- 一种传输方法,其特征在于,包括:终端接收源基站发送的切换命令;基于所述切换命令,所述终端触发从所述源基站向目标基站的切换过程,并维持与所述源基站间的用户数据的传输;在所述切换过程中,当所述源基站与所述终端之间用户数据的传输由维持转变成停止时,所述终端接收所述源基站发送的第一状态报告,所述第一状态报告用于向所述终端指示,所述源基站对所述终端的上行数据的接收状况。
- 如权利要求9所述的方法,其特征在于,在所述切换过程中,当所述源基站与所述终端之间的用户数据的传输由维持变成停止时,所述终端接收所述源基站发送的第一状态报告,具体包括:在所述切换过程中,当所述源基站接收到所述目标基站发送的所述接入指示时,所述终端接收所述源基站发送的所述第一状态报告;其中,所述接入指示,用于向所述源基站指示所述终端成功接入所述目 标基站。
- 如权利要求9所述的方法,其特征在于,还包括:在所述切换过程中,所述终端向所述源基站发送切换指示,用于指示所述终端断开或即将断开与所述源基站的连接;在所述切换过程中,当所述源基站与所述终端之间用户数据的传输由维持转变成停止时,所述终端接收所述源基站发送的第一状态报告,具体包括:在所述切换过程中,所述终端接收所述源基站基于所述切换指示发送的所述第一状态报告。
- 如权利要求11所述的方法,其特征在于,在所述终端向所述源基站发送切换指示后,还包括:所述终端向所述源基站发送第二状态报告,所述第二状态报告用于向所述源基站指示,所述终端的下行数据的接收状况。
- 如权利要求12所述的方法,其特征在于:所述第一状态报告或第二状态报告为以下任一种:无线链路控制(RLC)状态报告;或分组数据汇聚协议(PDCP)状态报告。
- 如权利要求13所述的方法,其特征在于:所述RLC状态报告指示:所述源基站下一个未接收到的上行数据的序列号和所述序列号之前的所有未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和所述序列号之前的所有未接收到的下行数据的序列号;所述PDCP状态报告指示:所述源基站第一个丢失的上行数据的序列号和从所述序列号开始的未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和从所述序列号开始的未接收到的下行数据的序列号。
- 一种基站,其特征在于,包括:发送单元,用于向终端发送切换命令,用于触发所述终端从所述基站向目标基站的切换过程;处理单元,用于维持所述基站与所述终端间的用户数据的传输;所述发送单元,还用于在所述切换过程中,当所述基站与所述终端之间 用户数据的传输由维持转变成停止时,向所述终端发送第一状态报告,所述第一状态报告用于向所述终端指示,所述基站对所述终端的上行数据的接收状况。
- 如权利要求15所述的基站,其特征在于,还包括:接收单元,用于在所述切换过程中,接收所述目标基站发送的接入指示,用于指示所述终端成功接入所述目标基站;所述发送单元,具体用于:在所述切换过程中,当所述接收单元接收到所述目标基站发送的所述接入指示时,向所述终端发送所述第一状态报告。
- 如权利要求15所述的基站,其特征在于,还包括:接收单元,用于在所述切换过程中,接收所述终端发送的切换指示,用于指示所述终端断开或即将断开与所述基站的连接;所述发送单元,具体包括:在所述切换过程中,当所述接收单元接收所述终端发送的所述切换指示时,向所述终端发送所述第一状态报告。
- 如权利要求17所述的基站,其特征在于,在所述接收单元接收所述终端发送的切换指示后,所述接收单元还用于:接收所述终端发送的第二状态报告,所述第二状态报告用于向所述基站指示,所述终端的下行数据的接收状况。
- 如权利要求15至17任一项所述的基站,其特征在于,在所述发送单元向所述终端发送所述第一状态报告之后,所述发送单元还用于:向所述目标基站发送序列号状态传输信息,用于向所述目标基站指示,所述基站对所述终端的上行数据的获取状况;向所述目标基站转发获取的所述终端的上行数据。
- 如权利要求19所述的基站,其特征在于:基于所述接收单元接收所述终端发送的所述第二状态报告,所述序列号状态传输信息,还用于向所述目标基站指示,所述基站对所述终端的下行数据的发送状况。
- 如权利要求18至20任一项所述的基站,其特征在于:所述第一状态报告或第二状态报告为以下任一种:无线链路控制(RLC)状态报告;或分组数据汇聚协议(PDCP)状态报告。
- 如权利要求21所述的基站,其特征在于:所述RLC状态报告指示:所述基站下一个未接收到的上行数据的序列号和所述序列号之前的所有未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和所述序列号之前的所有未接收到的下行数据的序列号;所述PDCP状态报告指示:所述基站第一个丢失的上行数据的序列号和从所述序列号开始的未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和从所述序列号开始的未接收到的下行数据的序列号。
- 一种终端,其特征在于,包括:接收单元,用于接收源基站发送的切换命令;处理单元,用于基于所述切换命令,触发从所述源基站向目标基站的切换过程,并维持与所述源基站间的用户数据的传输;所述接收单元,还用于在所述切换过程中,当所述源基站与所述终端之间用户数据的传输由维持转变成停止时,接收所述源基站发送的第一状态报告,所述第一状态报告用于向所述终端指示,所述源基站对所述终端的上行数据的接收状况。
- 如权利要求23所述的终端,其特征在于,在所述切换过程中,当所述源基站与所述终端之间的用户数据的传输由维持变成停止时,所述接收单元具体用于:在所述切换过程中,当所述源基站接收到所述目标基站发送的所述接入指示时,接收所述源基站发送的所述第一状态报告;其中,所述接入指示,用于向所述源基站指示所述终端成功接入所述目标基站。
- 如权利要求23所述的终端,其特征在于:还包括发送单元,用于在所述切换过程中,向所述源基站发送切换指示,用于指示所述终端断开或即将断开与所述源基站的连接;在所述切换过程中,当所述源基站与所述终端之间用户数据的传输由维持转变成停止时,所述终端接收所述源基站发送的第一状态报告,所述接收 单元,具体用于:在所述切换过程中,接收所述源基站基于所述切换指示发送的所述第一状态报告。
- 如权利要求25所述的终端,其特征在于,在所述发送单元向所述源基站发送切换指示后,所述发送单元还用于:向所述源基站发送第二状态报告,所述第二状态报告用于向所述源基站指示,所述终端的下行数据的接收状况。
- 如权利要求26所述的终端,其特征在于:所述第一状态报告或第二状态报告为以下任一种:无线链路控制(RLC)状态报告;或分组数据汇聚协议(PDCP)状态报告。
- 如权利要求27所述的终端,其特征在于:所述RLC状态报告指示:所述源基站下一个未接收到的上行数据的序列号和所述序列号之前的所有未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和所述序列号之前的所有未接收到的下行数据的序列号;所述PDCP状态报告指示:所述源基站第一个丢失的上行数据的序列号和从所述序列号开始的未接收到的上行数据的序列号;或,所述终端下一个未接收到的下行数据的序列号和从所述序列号开始的未接收到的下行数据的序列号。
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| PCT/CN2016/083704 Ceased WO2017201743A1 (zh) | 2016-05-27 | 2016-05-27 | 传输方法、基站和终端 |
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| US (1) | US20190098539A1 (zh) |
| EP (1) | EP3454604B1 (zh) |
| CN (1) | CN109155951B (zh) |
| WO (1) | WO2017201743A1 (zh) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10812220B1 (en) * | 2018-09-26 | 2020-10-20 | Parallels International Gmbh | Method and system for transmitting data over multiple paths |
| US10667192B1 (en) | 2018-11-12 | 2020-05-26 | Qualcomm Incorporated | Handover techniques in wireless communications |
| US11006342B2 (en) * | 2018-11-12 | 2021-05-11 | Qualcomm Incorporated | Handover techniques in wireless communications |
| WO2021008522A1 (en) * | 2019-07-16 | 2021-01-21 | FG Innovation Company Limited | Method of handover procedure and related device |
| CN111800831B (zh) * | 2019-08-01 | 2021-09-07 | 维沃移动通信有限公司 | 路径变换方法、设备、通信系统及计算机可读存储介质 |
| CN112533256A (zh) * | 2019-09-17 | 2021-03-19 | 维沃移动通信有限公司 | 数据传输方法、终端及网络节点 |
| US12483961B2 (en) | 2020-10-28 | 2025-11-25 | Nokia Technologies Oy | Handover of a communication session |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1903820A1 (en) * | 2006-09-20 | 2008-03-26 | Samsung Electronics Co.,Ltd. | Handover method and apparatus in a mobile communication system |
| CN101296485A (zh) * | 2007-04-28 | 2008-10-29 | 中兴通讯股份有限公司 | 状态查询方法和切换方法 |
| WO2010127493A1 (zh) * | 2009-05-07 | 2010-11-11 | 华为技术有限公司 | 切换处理方法、基站及中继节点 |
| CN101933253A (zh) * | 2008-02-04 | 2010-12-29 | Lg电子株式会社 | 用于在无线设备和网络之间传送数据单元序列的无线通信方法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008076073A1 (en) * | 2006-12-19 | 2008-06-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Transfer of buffered data from a source base station to a target base station |
| CN101296483A (zh) * | 2007-04-28 | 2008-10-29 | 中兴通讯股份有限公司 | 移动通讯系统切换过程中的状态通知方法 |
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2016
- 2016-05-27 CN CN201680086145.5A patent/CN109155951B/zh active Active
- 2016-05-27 EP EP16902732.3A patent/EP3454604B1/en active Active
- 2016-05-27 WO PCT/CN2016/083704 patent/WO2017201743A1/zh not_active Ceased
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2018
- 2018-11-26 US US16/199,956 patent/US20190098539A1/en not_active Abandoned
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1903820A1 (en) * | 2006-09-20 | 2008-03-26 | Samsung Electronics Co.,Ltd. | Handover method and apparatus in a mobile communication system |
| CN101296485A (zh) * | 2007-04-28 | 2008-10-29 | 中兴通讯股份有限公司 | 状态查询方法和切换方法 |
| CN101933253A (zh) * | 2008-02-04 | 2010-12-29 | Lg电子株式会社 | 用于在无线设备和网络之间传送数据单元序列的无线通信方法 |
| WO2010127493A1 (zh) * | 2009-05-07 | 2010-11-11 | 华为技术有限公司 | 切换处理方法、基站及中继节点 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3454604B1 (en) | 2020-04-15 |
| EP3454604A1 (en) | 2019-03-13 |
| CN109155951A (zh) | 2019-01-04 |
| EP3454604A4 (en) | 2019-03-13 |
| CN109155951B (zh) | 2021-01-29 |
| US20190098539A1 (en) | 2019-03-28 |
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