WO2017193842A1 - Procédé, dispositif et système de commutation de cellule, et support de stockage informatique - Google Patents

Procédé, dispositif et système de commutation de cellule, et support de stockage informatique Download PDF

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Publication number
WO2017193842A1
WO2017193842A1 PCT/CN2017/082782 CN2017082782W WO2017193842A1 WO 2017193842 A1 WO2017193842 A1 WO 2017193842A1 CN 2017082782 W CN2017082782 W CN 2017082782W WO 2017193842 A1 WO2017193842 A1 WO 2017193842A1
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WIPO (PCT)
Prior art keywords
time information
terminal
subframe
cell
target cell
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PCT/CN2017/082782
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English (en)
Chinese (zh)
Inventor
陈中明
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ZTE Corp
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ZTE Corp
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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
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • 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
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the embodiments of the present invention relate to the field of communications, and in particular, to a cell handover method, apparatus, system, and computer storage medium.
  • the UE in order to ensure the quality of the service and give the user a good service experience, after the UE establishes a connection with the network in a certain cell, the UE still needs to measure the signal quality of the serving cell and the neighboring cell, and select an appropriate cell. Switch to meet mobility requirements.
  • the embodiment of the invention provides a cell handover method, device, system and computer storage medium, so as to at least solve the problem that the handover efficiency is low due to a long service interruption time in the cell handover process.
  • An embodiment of the present invention provides a cell handover method, including: receiving, for indicating, a terminal from a source Switching a handover command to the target cell by the cell; controlling the terminal to perform communication in the source cell according to the first time information, and controlling the terminal to perform communication in the target cell according to the second time information; After the communication completes the access of the terminal to the target cell, it is determined that the terminal handover is successful.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the cell switching method according to the embodiment of the present invention.
  • the embodiment of the present invention further provides a cell handover method, including: transmitting, to a terminal, a handover command for instructing the terminal to switch from a source cell to a target cell; and in the source cell and the terminal according to the first time information. And performing communication; when the access of the terminal to the target cell is completed by communication in the target cell, disconnecting from the terminal is performed.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the cell switching method according to the embodiment of the present invention.
  • the embodiment of the present invention further provides a cell switching apparatus, including: a receiving unit, configured to receive a handover command for instructing a terminal to switch from a source cell to a target cell; and a control unit configured to control the terminal according to the first time information
  • the source cell performs communication, and controls the terminal to perform communication in the target cell according to the second time information.
  • the switching unit is configured to complete the access of the terminal to the target cell by using the communication in the target cell. And determining that the terminal is successfully switched.
  • An embodiment of the present invention further provides a cell switching apparatus, including: a sending unit, configured to send, to a terminal, a handover command for instructing the terminal to switch from a source cell to a target cell; and a communication unit, where the first time information is The source cell communicates with the terminal; the switching unit is configured to disconnect the terminal after completing the access of the terminal to the target cell by communication in the target cell.
  • a sending unit configured to send, to a terminal, a handover command for instructing the terminal to switch from a source cell to a target cell
  • a communication unit where the first time information is The source cell communicates with the terminal
  • the switching unit is configured to disconnect the terminal after completing the access of the terminal to the target cell by communication in the target cell.
  • the embodiment of the present invention further provides a cell handover system, including a base station and a terminal corresponding to the source cell, where the base station corresponding to the source cell sends a handover command for instructing the terminal to switch from the source cell to the target cell to the terminal;
  • the terminal performs communication in the source cell according to the first time information, and performs communication on the target cell according to the second time information; the terminal completes the connection of the terminal to the target cell according to the communication in the target cell. After entering, it is determined that the above terminal handover is successful.
  • the cell handover method, device, system, and computer storage medium interact with the source cell and the target cell respectively by using time division multiplexing in the process of the terminal switching from the source cell to the target cell, that is, Performing communication in the source cell according to the first time information in the handover command, and performing communication on the target cell according to the second time information in the handover command, so that before the terminal successfully switches to the target cell, the connection with the source cell can be maintained and executed.
  • the random access process to the target cell is used to ensure that the terminal service is not interrupted, and the terminal service that interrupts the current execution needs to be interrupted when the cell is switched to the terminal of the normal terminal or the terminal with low connection capability.
  • the problem of low handover efficiency caused by a long time further achieves an effect of improving cell handover efficiency.
  • 1 is a schematic diagram of a protocol stack between a user equipment and a base station in the related art
  • FIG. 3 is a schematic flowchart 1 of an implementation process of a cell handover method according to an embodiment of the present invention
  • FIG. 4 is an interaction flowchart 1 of a cell handover method according to an application example of the present invention.
  • FIG. 5 is a schematic structural diagram of a structure of a radio frame according to an embodiment of the present invention.
  • FIG. 6 is a second flowchart of a cell handover method according to an application example of the present invention.
  • FIG. 7 is a second schematic diagram of an implementation process of a cell handover method according to an embodiment of the present invention.
  • FIG. 8 is a first schematic structural diagram of a cell switching apparatus according to an embodiment of the present invention.
  • FIG. 9 is a second schematic structural diagram of a cell switching apparatus according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a structure of a cell switching system according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a protocol stack between a user equipment or a user equipment (UE) and a base station (eNodeB, eNB) according to the related art.
  • a UE in a Long Term Evolution (LTE) system and The protocol stack of the inter-eNB interface is divided into the following protocol layers from the bottom to the top: physical layer (PHY), media access control layer (MAC), and radio link control layer (Radio Link Control, RLC), Packet Data Convergence Protocol (PDCP), Radio Resource Control (RRC).
  • PHY physical layer
  • MAC media access control layer
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • RRC Radio Resource Control
  • the PHY layer mainly transmits information to the MAC or higher layer through the transport channel; the MAC layer mainly provides data transmission and is responsible for radio resource allocation through the logical channel, and completes hybrid automatic repeat request (Hybrid ARQ, HARQ), scheduling (Scheduling, SCH) , priority processing and multiplexing demultiplexing (MUX) and other functions; RLC layer mainly provides segmentation and retransmission services for user and control data; PDCP layer mainly performs user data transmission to RRC or user plane; RRC The layer mainly completes broadcasting, paging, radio resource control connection management, radio bearer control, mobility function, terminal measurement report and control. Before the UE sends data to the base station, it needs to obtain uplink synchronization with the base station, that is, acquire the time advance (TA), and the UE passes the random access process. To achieve this goal, this process is implemented at the MAC layer.
  • TA time advance
  • FIG. 2 is a flowchart of a handover according to the related art, as shown in FIG. 2, steps S202-S210.
  • the UE 202 receives a command on the network side and needs to perform handover (point A in FIG. 2), the user plane is reset.
  • the algorithm performs random access in the target cell 206. After the random access is completed, the UE can communicate with the target cell 206 (point B in FIG. 2), and the UE 202 sends a handover complete command to the target cell 206. When the UE 202 performs a random access procedure in the target cell 206, it needs to disconnect the data communication with the source cell 204.
  • the interruption time is the time occupied by the random access procedure, that is, the random access starts. And the time between completion.
  • the embodiment of the present invention interacts with the source cell and the target cell by using a time division multiplexing manner, that is, performs communication in the source cell according to the first time information in the handover command, and performs communication in the target cell according to the second time information in the handover command. Therefore, before the terminal successfully switches to the target cell, the connection with the source cell can be maintained, and a random access procedure to the target cell is performed to ensure that the terminal service is not interrupted, thereby overcoming the prior art to the ordinary terminal.
  • the terminal that supports the lower connection capability performs the cell handover, the terminal service that is currently executed needs to be interrupted, and the handover efficiency caused by the long service interruption time is low, and the effect of improving the cell handover efficiency is further achieved.
  • FIG. 3 is a schematic flowchart 1 of an implementation process of a cell handover method according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • S301 Receive a handover command for instructing a terminal to switch from a source cell to a target cell.
  • the control terminal performs communication in the source cell according to the first time information, and the control terminal performs communication in the target cell according to the second time information.
  • the cell handover method may be, but is not limited to, applied to a terminal of a cell handover system.
  • the terminal receives a handover command for instructing the terminal to switch from the source cell to the target cell, where the handover command carries first time information used to indicate that the terminal is used by the source cell, and is used to indicate that the terminal is in the The second time information used by the target cell; the terminal performs communication in the source cell according to the first time information, and performs communication in the target cell according to the second time information; after completing the terminal access to the target cell by communication in the target cell , to determine that the terminal is successfully switched.
  • the terminal receives a handover command for instructing the terminal to switch from the source cell to the target cell, where the handover command carries the first time information used to indicate the terminal used by the source cell, or is used to indicate the terminal.
  • Second time information used by the target cell the terminal performs communication in the source cell according to the first time information, and performs communication in the target cell according to the second time information; completes terminal access to the target cell by communication in the target cell After that, it is determined that the terminal is successfully switched.
  • the source cell and the target cell are respectively interacted by using a time division multiplexing manner, that is, according to the first in the handover command.
  • the time information is communicated in the source cell, and the second time information in the handover command is used to communicate in the target cell, so that before the terminal successfully switches to the target cell, the connection with the source cell can be maintained, and the target cell also communicates.
  • the second time information when the handover command carries the first time information used to indicate the terminal used by the source cell, the second time information may be determined according to a predetermined algorithm according to the first time information.
  • the method further includes: acquiring, according to the handover command, the subframe indicated by the first time information in each radio frame, and The subframe indicated by the second time information in the radio frames.
  • the first time information in the foregoing handover command may be, but is not limited to, a subframe that is used between the base stations corresponding to the source cell in each radio frame, and the foregoing switching is performed.
  • the second time information in the command may be, but is not limited to, a subframe that is usable between base stations corresponding to the target cell in each radio frame.
  • the manner of configuring the subframe in each radio frame may include, but is not limited to, at least one of the following:
  • the subframe allocation manner is used to indicate a subframe indicated by the first time information in each radio frame, and a second subframe in each radio frame The subframe indicated by the time information.
  • the subframe allocation manner indicated by the predetermined bit may be a pre-configured manner, such as bit 00 identification mode 1, 01 identification mode 2, and 10 identification mode.
  • the pre-configured manner may include, but is not limited to, a predetermined configuration mode, a default configuration mode, and a random configuration mode.
  • configuring the subframe according to the foregoing predetermined configuration manner may include but is not limited to At least one of the following:
  • the subframe indicated by the first time information includes: an even-numbered subframe in each radio frame, and the subframe indicated by the second time information includes: an odd-numbered subframe in each radio frame; or, the first time The subframe indicated by the information includes: an odd-numbered subframe in each radio frame; and the subframe indicated by the second time information includes: an even-numbered subframe in each radio frame;
  • each radio frame is repeated, the source cell adopts an even-numbered subframe of each radio frame, the target cell uses an odd-numbered subframe of each radio frame, or vice versa, the source cell uses an odd-numbered subframe of each radio frame, The target cell uses the even numbered subframe of each radio frame.
  • the subframe indicated by the first time information includes: the first five subframes in each radio frame, and the subframe indicated by the second time information includes: the last five subframes in each radio frame; or, the first The subframe indicated by the time information includes: the last five subframes in each radio frame, and the subframe indicated by the second time information includes: the first five subframes in each radio frame.
  • each radio frame is repeated, the source cell adopts the first five subframes of each radio frame, the target cell uses the last five subframes of each radio frame, or vice versa, the source cell uses the last five subframes of each radio frame, The target cell uses the first five subframes of each radio frame.
  • the subframe indicated by the first time information and the subframe indicated by the second time information are alternately arranged according to a predetermined subframe width.
  • alternate configurations are repeated in a predetermined subframe width in each radio frame, or in every two or every three or four subframes of a radio frame.
  • the predetermined subframe width includes at least one of the following: two subframes and four subframes.
  • the alternate configuration in every two radio frames may include, but is not limited to, at least one of: starting from an odd-numbered frame of every two radio frames, a subframe indicated by the first time information, and a second
  • the subframes indicated by the time information are alternately arranged according to a predetermined subframe width, or, from the even-numbered frames of every two radio frames, the subframe indicated by the first time information and the subframe indicated by the second time information are scheduled.
  • the sub-frame widths are alternately configured.
  • every two radio frames are repeated, the first two subframes of the even-numbered frame are used by the source cell, the next two subframes are used by the target cell, and so on; or the first two subframes of the even-numbered frame are used by the target cell, The next two subframes are used by the source cell, and so on; or, the first two subframes of the odd-numbered frame are used by the source cell, the next two subframes are used by the target cell, and so on; or the first two subframes of the odd-numbered frame
  • the frame is used by the target cell, the next two subframes are used by the source cell, and so on.
  • every two radio frames are repeated, the first four subframes of the even-numbered frame are used by the source cell, the next four subframes are used by the target cell, and so on; or the first four subframes of the even-numbered frame are used by the target cell.
  • the next four subframes are used by the source cell, and so on; or, the first four subframes of the odd-numbered frame are used by the source cell, the next four subframes are used by the target cell, and so on; or the first four of the odd-numbered frames
  • the subframes are used by the target cell, the next four subframes are used by the source cell, and so on.
  • the method after receiving the handover command for instructing the terminal to switch from the source cell to the target cell, the method further includes: adjusting the conversion parameter of the terminal in the predetermined subframe.
  • the conversion parameter of the terminal is adjusted in the predetermined subframe, but is not limited to: determining whether the handover condition is met according to the handover command, where the handover condition includes at least one of the following: the source cell and the target cell are in the same frequency.
  • the cell has the same bandwidth as the source cell and the target cell; when the handover condition is not met, the conversion parameters of the terminal are adjusted in a predetermined subframe.
  • adjusting the conversion parameters of the terminal in the predetermined subframe includes:
  • the conversion parameter when switching from the source cell to the target cell, the conversion parameter needs to be adjusted, so that the terminal can perform the corresponding service normally;
  • the conversion parameters need to be adjusted so that the terminal can perform the corresponding service normally.
  • the base station of the cell corresponding to the indicated subframe is interacted according to the time division multiplexing mode, corresponding parameter conversion is required.
  • corresponding frequency conversion is required.
  • corresponding bandwidth conversion is required.
  • the terminal 402 performs normal data communication with the base station corresponding to the source cell 404.
  • the terminal 402 receives the handover command sent by the network side (the base station corresponding to the source cell 404) (as shown in point A in FIG. 4), and the terminal 402 obtains the subframe or time information that the terminal can use in the source cell 404 by using the handover command.
  • step S406 the terminal 402 performs a handover process.
  • step S406-1 the terminal 402 performs normal data transmission and reception in the source cell 404 through a usable subframe or time.
  • step S406-2 the terminal 402 passes the usable sub-component in the target cell 406. Perform a random access procedure at frame or time;
  • the terminal 402 can perform data communication with the target cell 406 (as shown in point B in FIG. 4);
  • the terminal 402 sends a handover complete command to the target cell 406, and performs user plane reset (including MAC layer reset and PDCP, RLC layer reconstruction), disconnects the source cell, and applies the configuration of the target cell, so that all the target cells are located. Subframes or time can be used normally.
  • user plane reset including MAC layer reset and PDCP, RLC layer reconstruction
  • the subframe allocated in the source cell and the target cell may include at least one of the following conditions as shown in FIG. 5:
  • the above method can be expressed by an indication bit, such as bit 00 identification mode 1, 01 identification mode 2, 10 identification mode three, 11 identification mode four, and so on.
  • each radio frame is repeated, or every two or three or four waiting radio frame repetitions, and each time unit, such as each sub-frame, is assigned an indication identifier bit, and the identifier is 0 or 1 to the source cell. If used, the identifier is 1 or 0, which is used for the target cell. This can achieve random allocation.
  • the terminal interacts with the source cell and the target cell by using a time division multiplexing manner, that is, according to the first time in the handover command, in the process of the terminal switching from the source cell to the target cell.
  • Information is communicated in the source cell, according to the handover command
  • the second time information is communicated in the target cell, so that before the terminal successfully switches to the target cell, the connection with the source cell can be maintained, and the target cell is also communicated to ensure that the terminal service is not interrupted, thereby overcoming the present situation.
  • the method further includes:
  • the manner of configuring the subframe in each radio frame may include, but is not limited to, at least one of the following:
  • each of the subframes in the radio frame is configured with a corresponding identifier to indicate an available cell.
  • the corresponding command is obtained by acquiring the handover command.
  • the identifier of the second time information and the second time information in the radio frame are respectively obtained.
  • the subframe allocation manner is used to indicate a subframe indicated by the first time information in each radio frame, and a second subframe in each radio frame The subframe indicated by the time information.
  • the radio frame is indicated as a subframe configured for the source cell and the target cell according to the mode shown in FIG. 5; when the predetermined bit indication is 01, the radio frame is indicated to be According to the mode 2 shown in FIG. 5, the subframe configured for the source cell and the target cell; when the predetermined bit indicates 10, the wireless frame is indicated as the source cell and the target cell according to the mode 3 shown in FIG. Subframe; when the predetermined bit is indicated as 11, it indicates that the radio frame is pressed In the manner shown in FIG. 5, the subframes configured for the source cell and the target cell are four. It should be noted that, as the mode pattern is increased, the number of bits of the predetermined bit may be increased. For example, a predetermined bit of 3 bits is used to indicate eight configuration modes. The specific process is as described above, and details are not described herein again.
  • the subframes configured as the source cell and the target cell are respectively obtained according to the handover command, so that the terminal respectively performs time division multiplexing on the corresponding different subframes, and the service is not interrupted. Switching from the source cell to the target cell, thereby ensuring the efficiency of cell handover.
  • the subframe indicated by the first time information includes: an even-numbered subframe in each radio frame or an odd-numbered subframe in each radio frame; and the subframe indicated by the second time information includes : odd-numbered subframes in each radio frame or even-numbered subframes in each radio frame.
  • the subframe indicated by the first time information and the subframe indicated by the second time information are alternately configured according to a predetermined subframe width.
  • alternate configurations are repeated in a predetermined subframe width in each radio frame, or in every two or every three or four subframes of a radio frame.
  • the predetermined subframe width includes at least one of the following: two subframes and four subframes.
  • the subframe indicated by the first time information and the subframe indicated by the second time information are alternately configured according to a predetermined subframe width, or
  • the even-numbered frames of the two radio frames start, and the subframe indicated by the first time information and the subframe indicated by the second time information are alternately arranged according to a predetermined subframe width.
  • the corresponding subframe is configured for the source cell and the target cell in different manners to ensure that the service is not interrupted during the process of the terminal switching from the source cell to the target cell, thereby reducing the time for service interruption.
  • control terminal performs communication in the source cell according to the first time information, and controls the terminal to perform communication in the target cell according to the second time information, including:
  • the control terminal performs communication in the source cell on the subframe indicated by the first time information.
  • the control terminal performs a random access procedure to the target cell on the subframe indicated by the second time information.
  • the controlling the terminal to perform the random access process to the target cell on the subframe indicated by the second time information includes:
  • the random access preamble information is sent to the target cell in the target subframe that is found on the subframe indicated by the second time information, where the random access preamble information carries the predetermined identifier that is configured by the target cell to the terminal.
  • the subframe in which the target cell performs the random access procedure is a predetermined target subframe, and not all the subframes may perform a random access procedure. Therefore, in the embodiment of the present invention, the terminal is in the second time information.
  • the method may include, but is not limited to, searching for the target subframe for performing random access on the subframe indicated by the second time information to the target cell.
  • the random access preamble information is sent, where the random access preamble information carries a predetermined identifier that is configured by the target cell to the terminal. Therefore, the subframes that the terminal accesses the target cell are further searched from the selected candidate subframes, so that the random access procedure to the target cell is completed on the subframe.
  • the method further includes:
  • adjusting the conversion parameters of the terminal in the predetermined subframe includes:
  • the source cell and the target cell are different frequency cells (the working frequency points are different) or the cells with different working bandwidths (the working frequency points are the same),
  • it is not limited to performing corresponding adjustments on the conversion parameters on a predetermined subframe, for example, converting the operating frequency, or adjusting the operating bandwidth and the like.
  • At least one of the following is also included:
  • the deletion of the corresponding content in the handover command is automatically performed, thereby avoiding performing the deletion operation by multiple signaling interactions, thereby further ensuring the handover efficiency.
  • the interaction overhead of the handover process is greatly reduced.
  • the cell 1 (source cell) is a cell of LTE, and the center carrier frequency is f1.
  • the cell 2 (target cell) is a cell of LTE, which is a neighboring cell of cell 1, and the center carrier frequency is f2. That is, the source cell and the target cell are inter-frequency cells.
  • Step 1 The current UE is in the connected state in the cell 1.
  • the network side sends a measurement task (Measurement Control) that the neighboring area signal quality is better than the serving cell's trigger event (A3), and the measurement object carrier frequency is f2.
  • Step 2 The UE performs the measurement, and finds that the cell 2 on the f2 meets the trigger condition of the event A3, and reports the measurement report to the network side.
  • Step 3 The network side decides to let the UE handover (Handover) to the cell 2, and send the handover standard. Handover request is given to cell 2.
  • Step 4 After receiving the handover preparation command, the cell 2 allocates a preamble, which is sent to the cell 1 in a handover command (Handover Request ack), where the handover command further includes the temporary allocation of the terminal allocated by the cell 2 in the cell 2 Identification (Cell-Radio Network Temp Identity, C-RNTI for short), information of cell 2 (for example, related information including f2 and f2, and other information of cell 2), and cell 1 forwards the handover command to the UE (RRC reconfiguration) (Handover)).
  • a handover command further includes the temporary allocation of the terminal allocated by the cell 2 in the cell 2 Identification (Cell-Radio Network Temp Identity, C-RNTI for short), information of cell 2 (for example, related information including f2 and f2, and other information of cell 2)
  • cell 1 forwards the handover command to the UE (RRC reconfiguration) (Handover)).
  • Step 5 After receiving the handover command, the UE learns that the subframe or time information of the active cell, that is, the cell 1 is, for example, the first five subframes of each radio frame, and the subframe or time information of the target cell, that is, the cell 2 is, for example, each The last five subframes of the radio frame, that is, mode four, know that it is necessary to perform seamless handover of time division multiplexing.
  • the terminal performs frequency conversion on the first subframe allocated to a certain cell, that is, at each In the first subframe of the first five subframes of the radio frame (time information allocated to the source cell), the terminal converts the working frequency point to the source cell (the subsequent four subframes can work in the source cell), in each radio frame The first subframe of the next five subframes (time information allocated to the target cell), the terminal converts the working frequency point to the target cell (the next four subframes can work in the target cell), and then starts normal data scheduling.
  • the terminal performs frequency conversion on the last subframe allocated to a certain cell, that is, the last subframe of the first five subframes of each radio frame (time information allocated to the source cell),
  • the terminal converts the working frequency point to the target cell (subsequent subframes are allocated to the target cell and therefore are to be converted), and the last subframe of the last five subframes of each radio frame (time information allocated to the target cell), the terminal
  • the working frequency is converted to the source cell (subsequent subframes are allocated to the source cell and therefore need to be converted), and then normal data scheduling begins.
  • the configuration of the related physical layer performs a random access procedure in a subframe that can be used by the cell 2 (the last five subframes of each radio frame), that is, the terminal sends a random access preamble (Message1) to the cell 2, and the message1 includes
  • the dedicated preamble provided by the cell 2 is a dedicated resource allocated by the cell 2 to the terminal.
  • the terminal performs normal data communication on the cell 1 using the subframes that the cell 1 can use (the first five subframes of each radio frame).
  • Step 6 After receiving the Message1, the cell 2 reserves resources for the UE, and responds to the UE with the message 2, including the authorization information (UL grant) transmitted by the TA and/or the UE on the uplink.
  • the authorization information UL grant
  • Step 7 After the UE receives the Message2, the collision-free random access procedure performed in the cell 2 ends, the UE obtains the downlink synchronization and the TA with the cell 2, and considers that the handover is successful, and the terminal completes the reset process of the user plane protocol by itself, and resets.
  • the subframes can be used normally, and the message 3 (HO complete) for indicating the completion of the handover is sent to the cell 2, the cell 2 notifies the core network to perform the path switch (Path Switch), and the cell 1 is indicated, and the UE has accessed the cell 2, The terminal disconnects communication with the cell 1 at the time. After receiving the indication, the cell 1 knows that the information of the subframe configured according to the time division multiplexing mode has expired.
  • the time allocation can be performed according to the configuration of the target cell random access.
  • the cell 1 (source cell) is a cell of LTE, and the center carrier frequency is f1.
  • the cell 2 (target cell) is a cell of LTE, which is a neighbor cell of cell 1, and the center carrier frequency is f1. That is, the source cell and the target cell are co-frequency cells.
  • Step 1 The current UE is in the connected state in the cell 1.
  • the network side sends a measurement task (Measurement Control) that the neighboring area signal quality is better than the serving cell's trigger event (A3), and the measurement object carrier frequency is f1.
  • Step 2 The UE performs the measurement, and finds that the cell 2 on the f1 meets the trigger condition of the event A3, and reports the measurement report to the network side.
  • Step 3 The network side decides to let the UE hand over to the cell 2, and sends a handover request (Handover request) to the cell 2.
  • a handover request (Handover request)
  • Step 4 After receiving the handover preparation command, the cell 2 allocates a preamble, which is sent to the cell 1 in a handover command (Handover Request ack), where the handover command further includes the temporary allocation of the terminal allocated by the cell 2 in the cell 2 Identification (Cell-Radio Network Temp Identity, C-RNTI for short), information of cell 2 (for example, related information including f2 and f2, and other information of cell 2), and cell 1 forwards the handover command to the UE (RRC reconfiguration) (Handover)).
  • a handover command further includes the temporary allocation of the terminal allocated by the cell 2 in the cell 2 Identification (Cell-Radio Network Temp Identity, C-RNTI for short), information of cell 2 (for example, related information including f2 and f2, and other information of cell 2)
  • cell 1 forwards the handover command to the UE (RRC reconfiguration) (Handover)).
  • Step 5 After receiving the handover command, the UE learns that the subframe or time information of the active cell, that is, the cell 1 is, for example, an even-numbered subframe of each radio frame, and the subframe or time information of the target cell, that is, the cell 2 is, for example, each The odd-numbered subframe of the radio frame, that is, mode one, knows that it is necessary to perform seamless switching of time division multiplexing,
  • the terminal sends a random access preamble (Message1) to the cell 2, and the Message1 includes a dedicated preamble provided by the cell 2, which is a dedicated resource allocated by the cell 2 to the terminal.
  • Message1 includes a dedicated preamble provided by the cell 2, which is a dedicated resource allocated by the cell 2 to the terminal.
  • the terminal performs normal data communication on the cell 1 using the subframes (the even-numbered subframes of each radio frame) that the cell 1 can use.
  • Step 6 After receiving the Message1, the cell 2 reserves resources for the UE, and responds to the UE with the message 2, including the authorization information (UL grant) transmitted by the TA and/or the UE on the uplink.
  • the authorization information UL grant
  • Step 7 After the UE receives the Message2, the collision-free random access procedure performed in the cell 2 ends, and the UE obtains the downlink synchronization and the TA with the cell 2, and the handover is considered successful.
  • the line completes the reset process of the user plane protocol, and the reset includes the MAC layer reset, the PDCP and the RLC layer reconstruction, and starts to communicate with the cell 2. All the subframes of the cell 2 can be used normally, and the Message3 (HO) for indicating the completion of the handover is sent. Complete) For cell 2, cell 2 notifies the core network to perform path switching (Path Switch), and indicates cell 1, the UE has accessed cell 2, and the terminal disconnects communication with cell 1 at this time. After receiving the indication, the cell 1 knows that the information of the subframe configured according to the time division multiplexing mode has expired.
  • the foregoing step 5 may be, but is not limited to, obtaining, after receiving the handover command, the subframe or time information of the active cell, that is, the cell 1 or the subframe or time information of the target cell, that is, the cell 2, such as each even-numbered radio frame.
  • the first two subframes are configured for cell 1
  • the next two subframes are configured for cell 2, and so on, that is, mode 2, knowing that seamless switching of time division multiplexing needs to be performed.
  • the UE learns the subframe or time information of the active cell, that is, the cell 1 or the subframe or time information of the target cell, that is, the cell 2, for example, the first four sub-frames of each even-numbered frame.
  • the frame is configured for cell 1, the next four subframes are configured for cell 2, and so on, that is, mode three.
  • the UE learns the subframe or time information of the active cell, that is, the cell 1 or the subframe or time information of the target cell, that is, the cell 2, for example, each radio frame is set to 0.
  • the bit indication is configured for use by the cell 1.
  • the bit indication set to 1 is configured for use by the cell 2.
  • the configuration is 00011111100, that is, for each radio frame, the subframes 0, 1, and 2 are configured for the cell 1; 3, 4, 5, 6.
  • Subframe No. 7 is configured for cell 2; subframes 8 and 9 are configured for cell 1.
  • the terminal since the source cell and the target cell are of the same frequency, the terminal does not need to perform frequency conversion, and therefore no time or subframe designation for frequency conversion is required. If the terminal needs to do other preparatory work, such as adjusting the working bandwidth, etc., the time of execution or the designation of the subframe, refer to the above example.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform.
  • hardware can also be used, but in many cases the former is a better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • FIG. 7 is a schematic flowchart 2 of the implementation process of the cell handover method according to the embodiment of the present invention. As shown in FIG. 7, the process includes the following steps:
  • the foregoing cell handover method may be, but is not limited to, being applied to a base station corresponding to a source cell of a cell handover system.
  • the base station corresponding to the source cell sends a handover command to the terminal to instruct the terminal to switch from the source cell to the target cell, where the handover command carries the first time information used to indicate the terminal used by the source cell, and And indicating, by the terminal, the second time information used by the terminal in the target cell; the base station corresponding to the source cell performs communication with the terminal in the source cell according to the first time information; and after the terminal completes the access to the target cell by the communication in the target cell, disconnects Connection to the terminal.
  • the base station corresponding to the source cell sends a handover command to the terminal for instructing the terminal to switch from the source cell to the target cell, where the handover command carries the first time information used to indicate that the terminal is used by the source cell, or And indicating, by the terminal, the second time information used by the terminal in the target cell; the base station corresponding to the source cell performs communication with the terminal in the source cell according to the first time information; and after completing the access of the terminal to the target cell by completing communication in the target cell, Open the connection to the terminal.
  • the source cell and the target cell are respectively interacted by using a time division multiplexing manner, that is, according to the first in the handover command.
  • the time information is communicated in the source cell, and the second time information in the handover command is used to communicate in the target cell, so that before the terminal successfully switches to the target cell, the connection with the source cell can be maintained, and the target cell also communicates.
  • the terminal switching service is interrupted when the terminal is switched to the normal terminal or the terminal with low connection capability. The low problem further realizes the effect of improving the cell switching efficiency.
  • the method before transmitting, to the terminal, a handover command for instructing the terminal to switch from the source cell to the target cell, the method further includes: configuring, in the handover command, the subframe indicated by the first time information in each radio frame And a subframe indicated by the second time information in each radio frame; generating a handover command according to the subframe indicated by the first time information and the subframe indicated by the second time information.
  • the method before transmitting, to the terminal, a handover command for instructing the terminal to switch from the source cell to the target cell, the method further includes: configuring, in the handover command, the subframe indicated by the first time information in each radio frame Or a subframe indicated by the second time information in each radio frame; generating a handover command according to the subframe indicated by the first time information or the subframe indicated by the second time information.
  • the manner of configuring the subframe in each radio frame may include, but is not limited to, at least one of the following:
  • the manner of configuring the subframe may include, but is not limited to, at least one of the following:
  • each radio frame is repeated, the source cell adopts an even-numbered subframe of each radio frame, the target cell uses an odd-numbered subframe of each radio frame, or vice versa, the source cell uses an odd-numbered subframe of each radio frame, The target cell uses the even numbered subframe of each radio frame.
  • each radio frame is repeated, the source cell adopts the first five subframes of each radio frame, the target cell uses the last five subframes of each radio frame, or vice versa, the source cell uses the last five subframes of each radio frame, The target cell uses the first five subframes of each radio frame.
  • alternate configurations are repeated in a predetermined subframe width in each radio frame, or in every two or every three or four subframes of a radio frame.
  • the predetermined subframe width includes at least one of the following: two subframes and four subframes.
  • the subframes indicated by the first time information and the subframes indicated by the second time information are alternately configured according to the predetermined subframe width, including:
  • every two radio frames are repeated, the first two subframes of the even-numbered frame are used by the source cell, the next two subframes are used by the target cell, and so on; or the first two subframes of the even-numbered frame are used by the target cell, The next two subframes are used by the source cell, and so on; or, the first two subframes of the odd-numbered frame are used by the source cell, the next two subframes are used by the target cell, and so on; or the first two subframes of the odd-numbered frame
  • the frame is used by the target cell, the next two subframes are used by the source cell, and so on.
  • every two radio frames are repeated, the first four subframes of the even-numbered frame are used by the source cell, the next four subframes are used by the target cell, and so on; or the first four subframes of the even-numbered frame are used by the target cell.
  • the next four subframes are used by the source cell, and so on; or, the first four subframes of the odd-numbered frame are used by the source cell, the next four subframes are used by the target cell, and so on; or the first four of the odd-numbered frames
  • the subframes are used by the target cell, the next four subframes are used by the source cell, and so on.
  • the method before transmitting, to the terminal, a handover command for instructing the terminal to switch from the source cell to the target cell, the method further includes: configuring, in the handover command, a predetermined subframe for adjusting the conversion parameter, where the conversion parameter includes At least one of the following: frequency, bandwidth.
  • the handover command indicates that the source cell and the target cell are different frequency cells or cells with different working bandwidths
  • the corresponding adjustments are performed on the conversion parameters during the handover process. For example, switching frequencies, or adjusting bandwidth, etc.
  • the foregoing predetermined subframe may include but is not limited to:
  • the conversion parameter when switching from the source cell to the target cell, the conversion parameter needs to be adjusted, so that the terminal can perform the corresponding service normally; when switching from the target cell to the source cell, Adjust the conversion parameters so that the terminal can perform the corresponding operations normally.
  • the base station of the cell corresponding to the indicated subframe is interacted according to the time division multiplexing mode, corresponding parameter conversion is required.
  • corresponding frequency conversion is required.
  • corresponding bandwidth conversion is required.
  • the method before the handover command is sent to the terminal to indicate that the terminal switches from the source cell to the target cell, the method further includes:
  • the manner of configuring the subframe in each radio frame may include, but is not limited to, at least one of the following:
  • each of the subframes in the radio frame is configured with a corresponding identifier to indicate an available cell.
  • the corresponding command is obtained by acquiring the handover command.
  • the identifier of the second time information and the second time information in the radio frame are respectively obtained.
  • configuring a subframe indicated by the first time information in each radio frame in the handover command, and a subframe indicated by the second time information in each radio frame includes:
  • the radio frame is indicated as a subframe configured for the source cell and the target cell according to the mode shown in FIG. 5; when the predetermined bit indication is 01, the radio frame is indicated to be According to the mode 2 shown in FIG. 5, the subframe configured for the source cell and the target cell; when the predetermined bit indicates 10, the wireless frame is indicated as the source cell and the target cell according to the mode 3 shown in FIG. If the predetermined bit is indicated as 11, the radio frame is indicated as a subframe configured for the source cell and the target cell in the manner shown in FIG.
  • the number of bits of the predetermined bit may be increased.
  • a predetermined bit of 3 bits is used to indicate eight configuration modes. The specific process is as described above, and details are not described herein again.
  • the method before the handover command is sent to the terminal to indicate that the terminal switches from the source cell to the target cell, the method further includes:
  • a predetermined subframe for adjusting a conversion parameter is configured in the handover command, where the conversion parameter includes at least one of the following: frequency, bandwidth.
  • the source cell and the target cell are different frequency cells (the working frequency points are different) or the cells with different working bandwidths (the working frequency points are the same),
  • it is not limited to performing corresponding adjustments on the conversion parameters on a predetermined subframe, for example, converting the operating frequency, or adjusting the operating bandwidth and the like.
  • a cell switching device is further provided, which is used to implement the foregoing embodiments and various extended embodiments thereof, and has not been described again.
  • the term "unit" may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware Implementation is also possible and conceived.
  • FIG. 8 is a structural block diagram 1 of a cell switching apparatus according to an embodiment of the present invention. As shown in FIG. 8, the apparatus includes:
  • the receiving unit 801 is configured to receive a handover command for instructing the terminal to switch from the source cell to the target cell;
  • the control unit 802 is configured to control the terminal to communicate in the source cell according to the first time information, and the control terminal performs communication in the target cell according to the second time information.
  • the switching unit 803 is configured to determine that the terminal handover succeeds after completing the access of the terminal to the target cell by the communication in the target cell.
  • the device further includes:
  • the obtaining unit 804 is configured to: after receiving the handover command for instructing the terminal to switch from the source cell to the target cell, acquiring, according to the handover command, the subframe indicated by the first time information in each radio frame, And a subframe indicated by the second time information in each radio frame.
  • the cell switching device may be, but is not limited to, a terminal applied to a cell switching system.
  • the specific implementation process of the functions performed by the units in the embodiments of the present invention is similar to the foregoing method embodiment 1, and details are not described herein again.
  • each unit in the cell switching device may be configured by a Central Processing Unit (CPU), a Micro Processor Unit (MPU), and a digital signal processor located at the terminal ( Digital Signal Processor (DSP), or Field Programmable Gate Array (FPGA) implementation.
  • CPU Central Processing Unit
  • MPU Micro Processor Unit
  • DSP Digital Signal Processor
  • FPGA Field Programmable Gate Array
  • a cell switching device is further provided, which is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein.
  • the term "unit" may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also implemented. Possible and conceived.
  • FIG. 9 is a second structural block diagram of a cell switching apparatus according to an embodiment of the present invention. As shown in FIG. 9, the apparatus includes:
  • the sending unit 901 is configured to send, to the terminal, a handover command for instructing the terminal to switch from the source cell to the target cell;
  • the communication unit 902 is configured to perform communication with the terminal in the source cell according to the first time information
  • the switching unit 903 is configured to disconnect the terminal after completing the access of the terminal to the target cell by communication in the target cell.
  • the apparatus further includes:
  • the configuration unit 904 is configured to: before the switching command for instructing the terminal to switch from the source cell to the target cell, to configure the first time information in each radio frame in the handover command The indicated subframe, or the subframe indicated by the second time information in each radio frame;
  • the generating unit 905 is configured to generate the switching command according to the subframe indicated by the first time information or the subframe indicated by the second time information.
  • the cell handover apparatus may be, but is not limited to, a base station corresponding to a source cell of the cell handover system.
  • the specific implementation process of the functions performed by the units in the embodiments of the present invention is similar to the foregoing method embodiment 2, and details are not described herein again.
  • each unit in the cell switching apparatus may be implemented by a CPU, an MPU, a DSP, or an FPGA located at a base station.
  • the source cell and the target cell are respectively interacted by using a time division multiplexing manner, that is, according to the first in the handover command.
  • the time information is communicated in the source cell, and the second time information in the handover command is used to communicate in the target cell, so that before the terminal successfully switches to the target cell, the connection with the source cell can be maintained, and the target cell also communicates.
  • a cell handover system including a base station and a terminal corresponding to the source cell, where
  • the base station corresponding to the source cell sends a handover command for instructing the terminal to switch from the source cell to the target cell, where the handover command carries the first time information used to indicate the terminal used by the source cell, and/or And indicating second time information used by the terminal in the target cell;
  • the terminal performs communication in the source cell according to the first time information, and performs communication in the target cell according to the second time information.
  • the system further includes a base station corresponding to the target cell.
  • the cell handover system includes a base station 1001 corresponding to the source cell, a terminal 1002, and a base station 1003 corresponding to the target cell.
  • the terminal 1002 after receiving the handover command from the base station 1001 corresponding to the source cell, the terminal 1002 performs communication in the source cell according to the first time information in the handover command according to the time division multiplexing manner, according to the second time information in the handover command.
  • the target cell performs communication (such as performing a random access procedure to the target cell).
  • the connection between the base station 1001 corresponding to the source cell can be maintained, and the base station 1003 corresponding to the target cell also performs communication to ensure that the terminal service is not interrupted, thereby overcoming
  • the terminal service that is currently executed needs to be interrupted, and the handover efficiency is low due to a long service interruption time, thereby further improving the cell handover efficiency. effect.
  • Embodiments of the present invention also provide a storage medium.
  • the above storage medium may be arranged to store program code for performing the following steps:
  • the control terminal performs communication in the source cell according to the first time information, and controls the terminal to perform communication in the target cell according to the second time information.
  • the storage medium is further configured to store program code for performing the following steps:
  • the storage medium is further configured to store program code for performing the following steps:
  • the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, a magnetic disk, or an optical disk.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • mobile hard disk a magnetic disk
  • magnetic disk a magnetic disk
  • optical disk a variety of media that can store program code.
  • An embodiment of the present invention provides a terminal, where the terminal includes: a memory configured to store a cell handover executable instruction, and a processor configured to perform the cell handover executable instruction, where the receiving is used to instruct the terminal to switch from the source cell to the target a handover command of the cell; controlling, by the terminal, communication in the source cell according to the first time information, controlling the terminal to communicate in the target cell according to the second time information; and completing the communication by using the communication in the target cell After the terminal accesses the target cell, it is determined that the terminal is successfully switched.
  • An embodiment of the present invention provides a base station, where the base station includes: a memory configured to store a cell handover executable instruction, and a processor configured to execute the cell handover executable instruction, and send the terminal to indicate that the terminal is from a source a handover command of the cell to the target cell; communicating with the terminal in the source cell according to the first time information; and completing the access of the terminal to the target cell by communication in the target cell, Open a connection with the terminal.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé, un dispositif et un système de commutation de cellule et un support de stockage informatique. Le procédé consiste : à recevoir une instruction de commutation pour donner l'instruction à un terminal d'être commuté d'une cellule source à une cellule cible ; à commander la communication du terminal dans la cellule source selon des premières informations temporelles, et à commander la communication du terminal dans la cellule cible selon des secondes informations temporelles ; et après que le terminal a complètement accédé à la cellule cible en fonction de sa communication dans la cellule cible, à déterminer que la commutation du terminal a réussi.
PCT/CN2017/082782 2016-05-11 2017-05-02 Procédé, dispositif et système de commutation de cellule, et support de stockage informatique Ceased WO2017193842A1 (fr)

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CN112312492B (zh) * 2019-08-02 2022-06-10 华为技术有限公司 切换方法、用于切换的系统和终端设备
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