WO2018024136A1 - Procédé et terminal d'accès aléatoire - Google Patents

Procédé et terminal d'accès aléatoire Download PDF

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Publication number
WO2018024136A1
WO2018024136A1 PCT/CN2017/094358 CN2017094358W WO2018024136A1 WO 2018024136 A1 WO2018024136 A1 WO 2018024136A1 CN 2017094358 W CN2017094358 W CN 2017094358W WO 2018024136 A1 WO2018024136 A1 WO 2018024136A1
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Prior art keywords
random access
network
terminal
access
resource
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Chinese (zh)
Inventor
许芳丽
陈瑞卡
潘学明
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0875—Non-scheduled access, e.g. ALOHA using a dedicated channel for access with assigned priorities based access

Definitions

  • the present disclosure relates to the field of communications technologies, and in particular, to a random access method and a terminal.
  • the current LTE system does not have different service delay requirements in the random access process, and therefore cannot guarantee different delay guarantees for the access process of services with different delay requirements.
  • the resources of the initial transmission and the retransmission of the random access procedure are basically the same, in this case, the initial transmission failure due to the conflict cannot be improved well at the time of retransmission.
  • the technical problem to be solved by the present disclosure is to provide a random access method and a terminal, which can improve the access success rate of the random access sequence retransmission, thereby shortening the delay of the entire random access.
  • an embodiment of the present disclosure provides a random access method, including:
  • the terminal After the access failure of the terminal in the random access network process, the terminal accesses the network again according to the replaced access configuration adopted by the random access network.
  • the steps of performing the re-random access to the network according to the access configuration after the replacement of the random access network include:
  • the terminal accesses the re-random access network according to the replaced access configuration adopted by the random access network again after the N access failures occur;
  • N the maximum number of accesses in the entire random access procedure.
  • the access failure in the process of the terminal accessing the network includes: the random access sequence sent by the terminal fails to be sent or the conflict resolution process in the random access network fails.
  • the replaced access configuration adopted by the re-random access network includes: a random access resource configuration or a fallback parameter in a random access procedure.
  • the replacement access configuration used by the re-random access network includes: when other random access resources are configured under the same network access point, the acquisition terminal randomly accesses the network after the random access network process.
  • the steps of the replaced access configuration used include:
  • the first random access configuration resource is different from the second random access configuration resource.
  • the steps of obtaining the second random access configuration resource used by the random access network include:
  • the steps of performing the re-random access to the network according to the access configuration after the replacement of the random access network include:
  • the random access process After the access failure of the terminal in the random access network process, the random access process is stopped, and the random access process is re-initiated according to the second random access configuration resource used by the random access network; or
  • the first random access configuration resource is replaced with the second random access configuration resource, and the second random access configuration resource used by the re-random access network is configured. Re-initiate the random access procedure.
  • the second random access configuration resource is discarded, and the configuration of the first random access configuration resource is restored.
  • the acquiring terminal uses the random access network after the random access network process.
  • the steps of the replaced access configuration include:
  • the terminal uses the first frequency to perform a random access network in the high and low frequency overlapping coverage area of the network, and acquires the second frequency used by the random access network again after the access failure in the random access network process;
  • the first frequency is a frequency within a frequency range employed by the high frequency region
  • the second frequency is a frequency within a frequency range employed by the low frequency region
  • the first frequency is a frequency within a frequency range employed by the low frequency region
  • the second frequency is a frequency within a frequency range employed by the high frequency region.
  • the acquiring terminal randomly accesses the network after the random access network process.
  • the steps of the replaced access configuration used include:
  • the terminal resides in a network in which a single frequency point is composed of multiple network access points, and performs a random access network process in the first cell in the network, and after the access fails, triggers the cell reselection process to obtain a new The selected second cell in the network or directly acquires a second cell whose signal strength is different from the signal strength of the first cell; wherein one network access point is a cell.
  • the acquiring terminal randomly accesses the network after the random access network process.
  • the steps of the replaced access configuration used include:
  • the terminal resides in a network in which a single frequency point is composed of multiple network access points, and at least one of the multiple network access points forms a cell, and the network access point residing from the terminal
  • the first random access configuration resource corresponding to the network access point accessed by the terminal and the second random access configuration resource corresponding to the cell are obtained in the sent system message block.
  • the step of performing the re-random access to the network according to the replaced access configuration adopted by the re-random access network includes:
  • the terminal After the access failure occurs in the random access process according to the first random access configuration resource, the terminal performs the re-random access network according to the second random access configuration resource;
  • the terminal After the access failure occurs in the cell in which the terminal is located according to the second random access configuration resource, the terminal performs the re-random access network according to the first random access configuration resource.
  • the acquisition terminal randomly accesses the network after the random access network process.
  • the steps of the replaced access configuration used include:
  • the backoff time parameter used by the random access network is obtained;
  • the signal strength is monitored on the preset channel, and when the signal strength is higher than the preset signal strength value, the backoff time parameter used by the random access network is obtained.
  • the acquisition terminal randomly accesses the network after the random access network process.
  • the steps of the replaced access configuration used include:
  • the replacement access configuration adopted by the re-random access network includes: when the back-off parameter in the random access process is acquired, the replacement used by the terminal after randomly accessing the network after the random access network process
  • the steps of the subsequent access configuration include:
  • the backoff time is obtained according to the backoff time parameter indication.
  • the steps for obtaining the backoff time parameter indication include:
  • the backoff time parameter indication is obtained by the MSG2 message or by the system message block or by the intercepted air interface message or by the backoff time parameter indication of the initial transmission.
  • the steps of obtaining the backoff time include:
  • the backoff time corresponding to the current service is obtained according to the corresponding relationship between the service and the service with different delay requirement attributes.
  • An embodiment of the present disclosure further provides a terminal, including:
  • the obtaining module is configured to obtain a replacement access configuration that is adopted when the terminal randomly accesses the network after the random access network process;
  • the access module is configured to perform a random access network again according to the replaced access configuration adopted by the re-random access network after the access failure in the random access network process.
  • the access module performs a re-random access network according to the replaced access configuration adopted by the re-random access network after the N access fails in the random access network process;
  • N the maximum number of accesses in the entire random access procedure.
  • the access failure in the process of the terminal accessing the network includes: the random access sequence sent by the terminal fails to be sent or the conflict resolution process in the random access network fails.
  • the replaced access configuration used by the re-random access network includes: a random access resource configuration or a fallback parameter in a random access procedure.
  • the acquiring module of the re-random access network includes: when the other random access resources are configured under the same network access point, the acquiring module includes:
  • a first acquiring unit configured to acquire a first random access configuration resource used by a terminal that is sent by a network access point by using a broadcast message in a random access network process, and a second random access that is used by the random access network again Configure resources;
  • a second acquiring unit configured to acquire, by the network access point, the first random access carried by the system message block After the resource is configured to perform the random access network process according to the first random access configuration resource, acquiring the second random access configuration resource used by the random access network again;
  • the first random access configuration resource is different from the second random access configuration resource.
  • the second obtaining unit acquires a second random access configuration resource that is sent by the network access point by using an MSG2 message or L1/L2 signaling.
  • the access module is specifically configured to:
  • the random access process is stopped, and the random access process is re-initiated according to the second random access configuration resource used by the random access network;
  • the first random access configuration resource is replaced with the second random access configuration resource, and the resource is re-configured according to the second random access configuration resource used by the re-random access network. Initiate a random access procedure.
  • the access module is further configured to: after the random access to the network is successful, discard the second random access configuration resource, and restore the configuration of the first random access configuration resource.
  • the acquiring module is specifically configured to: when the random access resource configured by the re-random access network is configured to be a frequency of the replacement,
  • the terminal uses the first frequency to perform a random access network in the high and low frequency overlapping coverage area of the network, and acquires the second frequency used by the random access network again after the access failure in the random access network process;
  • the first frequency is a frequency within a frequency range employed by the high frequency region
  • the second frequency is a frequency within a frequency range employed by the low frequency region
  • the first frequency is a frequency within a frequency range employed by the low frequency region
  • the second frequency is a frequency within a frequency range employed by the high frequency region.
  • the acquiring module is specifically configured to: when the random access resource used in the re-random access network is configured as a network access point after the replacement,
  • the terminal resides in a network in which a single frequency point is composed of multiple network access points, and performs a random access network process in the first cell in the network, and after the access fails, triggers the cell reselection process to obtain a new The selected second cell in the network or directly acquires a second cell whose signal strength is different from the signal strength of the first cell; wherein one network access point is a cell.
  • the acquiring module is specifically configured to: when the random access resource used in the re-random access network is configured as a network access point after the replacement,
  • the terminal resides in a network in which a single frequency point is composed of multiple network access points, and the multiple networks At least one network access point of the access point forms a cell, and the first random access configuration resource corresponding to the network access point accessed by the terminal is obtained from a system message block sent by the network access point where the terminal resides a second random access configuration resource corresponding to the cell.
  • the access module is specifically configured to: after the access failure of the terminal in the random access procedure according to the first random access configuration resource, the access module is configured according to the second random access configuration Resources to conduct random access to the network again;
  • the terminal After the access failure occurs in the cell in which the terminal is located according to the second random access configuration resource, the terminal performs the re-random access network according to the first random access configuration resource.
  • the acquiring module is specifically configured to: the terminal randomly accesses the network process, when the random access resource configured by the re-random access network is configured as the access configuration in the interception mechanism. After the failure, if the number of MSG1 detected within the predetermined length of time is greater than the preset value, the backoff time parameter used by the random access network is obtained again; or
  • the signal strength is monitored on the preset channel, and when the signal strength is higher than the preset signal strength value, the backoff time parameter used by the random access network is obtained.
  • the acquiring module is specifically configured to: when the random access resource configured by the re-random access network is configured as the access configuration in the interception mechanism,
  • the acquiring module of the re-random access network includes: when the back-off parameter is in the random access process, the acquiring module is specifically configured to: acquire the first random that is carried by the network through the system message block Accessing the configuration resource; after the initial random access procedure fails according to the first random access configuration resource, obtaining a backoff time parameter indication; and obtaining a backoff time according to the backoff time parameter indication.
  • the obtaining the back-off time parameter indicates that the back-off time parameter indication is obtained by using the MSG2 message or by the system message block or by the intercepted air interface message or by the back-off time parameter indication of the initial transmission.
  • the method is specifically configured to: obtain a backoff corresponding to the current number of transmissions according to the correspondence between the backoff time parameter indication and the number of transmission times
  • the time of the rollback time is obtained according to the backoff time parameter indication, the number of transmission times, and the superposition coefficient; or the corresponding relationship between the service with different delay requirement attributes is indicated according to the backoff time parameter, and the back time corresponding to the current service is obtained.
  • Embodiments of the present disclosure also provide a terminal, including a processor, a transceiver, and a memory;
  • the processor is configured to read a program in the memory and perform the following process:
  • the re-random access network is performed according to the replaced access configuration adopted by the random access network again;
  • the transceiver is configured to receive and transmit data
  • the memory is used to store data used by the processor to perform operations.
  • the embodiment of the present disclosure obtains the replaced access configuration adopted when the terminal accesses the network again after the random access network process; after the terminal fails to access in the random access network process, the terminal randomly connects again according to the random access network.
  • the replaced access configuration adopted by the network is used to perform random access to the network again. Therefore, the success rate and real-time performance of the retransmission when the terminal randomly accesses the network are improved, thereby ensuring the random access transmission delay requirement of the specific service and the delay requirement of the overall random access.
  • FIG. 1 is a flow chart of a random access method according to some implementations of the present disclosure
  • FIG. 3 is a specific signaling flowchart of the embodiment shown in FIG. 2;
  • FIG. 4 is a specific signaling flowchart of the embodiment shown in FIG. 2;
  • FIG. 5 is a flowchart of a random access method according to some embodiments of the present disclosure.
  • FIG. 6 is a scenario diagram of a communication system deployment
  • Figure 7 is a high and low frequency heterogeneous scene graph
  • FIG. 8 is a flowchart of a random access method according to some embodiments of the present disclosure.
  • FIG. 9 is a deployment scenario in which the same frequency layer has multiple TRPs, and each TRP is one cell;
  • FIG. 10 is a flowchart of a random access method according to some embodiments of the present disclosure.
  • FIG. 11 shows that the UE resides in a network composed of multiple TRPs at a single frequency point, and multiple TRPs form one. a scenario in which the cells are uniformly managed by the NB (Node B);
  • FIG. 12 is a specific implementation flowchart of the embodiment shown in FIG. 10;
  • FIG. 13 is a flowchart of a random access method according to some embodiments of the present disclosure.
  • Figure 16 is a flowchart showing a specific implementation of the embodiment shown in Figure 15;
  • 17 is a structural block diagram of a terminal of some embodiments of the present disclosure.
  • Embodiments of the present disclosure provide a processing method after random access failure.
  • the core idea is to initiate a subsequent random access procedure by using a new access method after the initial random access fails.
  • a random access method provided by some embodiments of the present disclosure includes:
  • Step 11 Obtain a replacement access configuration that is adopted when the terminal randomly accesses the network after the random access network process
  • the resources of the initial transmission and the retransmission of the random access procedure are basically the same.
  • the initial transmission failure due to the conflict cannot be improved well during the retransmission;
  • the replacement access configuration is adopted to improve the success rate and real-time performance of the retransmission when the terminal randomly accesses the network;
  • Step 12 After the access failure of the terminal in the random access network process, the terminal performs the re-random access network according to the replaced access configuration adopted by the random access network again;
  • the access failure in the terminal access network process includes: the random access sequence sent by the terminal fails to be sent or the conflict resolution process in the random access network fails.
  • the terminal performs the re-random access network according to the replaced access configuration adopted by the re-random access network;
  • N the maximum number of accesses in the entire random access procedure.
  • the random access network is initiated by using the replaced access configuration, including:
  • the first N access failures (N> 1), the Msg1 retransmission is performed in a new manner; or
  • the embodiment of the present disclosure obtains the replaced access configuration adopted when the terminal accesses the network again after the random access network process; after the terminal fails to access in the random access network process, the terminal randomly connects again according to the random access network.
  • the replaced access configuration adopted by the network is used to perform random access to the network again. Therefore, the success rate and real-time performance of the retransmission when the terminal randomly accesses the network are improved, thereby ensuring the random access transmission delay requirement of the specific service and the delay requirement of the overall random access.
  • the random access method includes:
  • the replaced access configuration adopted by the re-random access network includes: when other random access resources are configured under the same network access point,
  • Step 21 Acquire a first random access configuration resource used by a terminal that is sent by the network access point by using a broadcast message in a random access network process, and a second random access configuration resource that is used by the random access network again; or Obtaining, by the network access point, the first random access configuration resource carried in the system message block, after performing the random access network process according to the first random access configuration resource, acquiring the second random used by the random access network again Access configuration resources;
  • the second random access configuration resource that is sent by the network access point by using the MSG2 message or the L1/L2 signaling, where the first random access configuration resource is different from the second random access configuration resource;
  • Step 22 After the access failure in the process of the random access network, the terminal stops the random access process, and re-initiates the random access process according to the second random access configuration resource used by the random access network again; or the terminal is After the access fails in the process of the random access network, the first random access configuration resource is replaced with the second random access configuration resource, and is re-initiated according to the second random access configuration resource used by the re-random access network. Random access process.
  • Step 1 The network notifies the UE of the random access procedure in the cell to the UE by using the broadcast, where the initial transmission configuration is Cfg-1, and the retransmission configuration is Cfg-2.
  • the network side can configure each retransmission number for the UE.
  • the random access configuration can also be set to use Cfg-1 for the initial X transmissions, Cfg-2 for the subsequent Y transmissions, and Cfg-3... for the subsequent Z times.
  • Step 2 The UE initiates random access by using a Cfg-1 configuration.
  • Step 3 After the random access fails, the subsequent retransmission uses the Cfg-2 configuration to initiate random access.
  • Step 1 The UE acquires a RACH (Random Access Channel) configuration cfg-1 through system information, and stores it;
  • RACH Random Access Channel
  • Step 2 The UE initiates a random access procedure by using a Cfg-1 configuration.
  • Step 3 The network side directly reports that the RACH used for retransmission is Cfg-2 through L1/L2 signaling; wherein the information may also be directly carried by the Msg2 message, or may be a new L1/L2 signaling independent of the Msg2 message. Carrying; the UE initiates subsequent retransmission according to the Cfg-2 configuration indicated by the signaling;
  • Step 4 When the RA process fails, the random access sequence is retransmitted by using the configuration of Cfg-2, where the previous RA process may be stopped to re-initiate a new random access procedure, or the current random access procedure may not be interrupted. Directly apply the updated configuration for retransmission;
  • Step 5 After the random access succeeds, the UE discards the random access configuration Cfg-2 and restores the original Cfg-1 configuration. That is, the second random access configuration resource is discarded, and the configuration of the first random access configuration resource is restored.
  • the embodiment of the present disclosure obtains the access configuration of the same network access point, and enables the terminal to adopt the replaced access configuration when the network is randomly accessed again after the random access network process; the terminal is in random access. After the access failure in the network process, the network is re-randomly accessed according to the replaced access configuration adopted by the random access network again. Therefore, the success rate and real-time performance of the retransmission when the terminal randomly accesses the network are improved, thereby ensuring the random access transmission delay requirement of the specific service and the delay requirement of the overall random access.
  • some embodiments of the present disclosure provide a random access method, including:
  • Step 51 The terminal uses the first frequency to perform a random access network in the high and low frequency overlapping coverage area of the network, and obtains the second frequency used by the random access network again after the access failure in the random access network process;
  • Step 52 After the access failure of the terminal in the random access network process, the terminal performs the re-random access network according to the second frequency after the replacement of the random access network.
  • the first frequency is a frequency in a frequency range adopted by the high frequency region
  • the second frequency is a frequency in a frequency range adopted by the low frequency region; or the first frequency is within a frequency range adopted by the low frequency region Frequency, the second frequency being a frequency within a frequency range employed by the high frequency region.
  • ultra-dense networking is a trend in the future development of mobile communication systems.
  • the distributed processing node is also called a TRP (Transmission Reception Point)
  • the centralized processing node also becomes a CU (Central Unit, Central Processing Node) or NR eNB. (New RAT eNB, new access technology base station).
  • TRP Transmission Reception Point
  • CU Central Unit, Central Processing Node
  • NR eNB New RAT eNB, new access technology base station
  • the deployment scenario high-low frequency heterogeneous scenarios, in the same coverage area, that is, there is a high-frequency point TRP (HF), and there is a low-frequency point TRP (LF), if the terminal resides in the coverage In the range, the low-frequency point TRP can be accessed, or the high-frequency point TRP can be accessed.
  • HF high-frequency point
  • LF low-frequency point
  • the terminal uses the low-frequency access low-frequency point TRP in the high-low frequency overlapping coverage area of the network, after the access fails, The high frequency access high frequency point TRP can be used for random access again; of course, after the high frequency access high frequency point TRP fails, the low frequency access low frequency point TRP is used for random access again.
  • Embodiments of the present disclosure acquire a second frequency used by a re-random access network by using a first frequency to perform a random access network in a high-low frequency overlapping coverage area of the network, and access failure in a random access network process.
  • the second random access network is used according to the second frequency that is replaced by the random access network, so that after the low frequency point fails to be accessed, the high frequency may be adopted.
  • Point random access of course, it can also be low frequency point random access after high frequency point access failure. Therefore, the success rate and real-time performance of the retransmission when the terminal randomly accesses the network are improved, thereby ensuring the random access transmission delay requirement of the specific service and the delay requirement of the overall random access.
  • some embodiments of the present disclosure provide a random access method, including:
  • Step 81 The terminal resides in a network in which a single frequency point is composed of multiple network access points, and performs a random access network process in the first cell in the network, and triggers cell reselection after the access fails. Obtaining, by the process, the second cell in the network that is reselected or directly acquiring a second cell whose signal strength is different from the signal strength of the first cell; wherein, one network access point is one cell;
  • Step 82 After the access failure of the terminal in the random access network process, the terminal performs the re-random access network according to the replaced second cell used by the random access network again.
  • the same frequency layer has multiple TRPs, and each TRP is a cell.
  • the specific implementation process 1 of the method includes:
  • the UE resides in a network composed of multiple TRPs at a single frequency point, and each TRP is a cell;
  • Step 1 The UE first camps on the cell 1 and initiates random access through the cell 1;
  • Step 2 If the random access fails N times before, or the access of the entire random access procedure fails, the UE triggers a cell selection reselection process and selects to the cell 2;
  • Step 3 The UE directly initiates a subsequent random access procedure to the cell 2 (corresponding to the first N times of failures), or re-initiates the random access procedure (corresponding to the entire random access procedure access failure).
  • the specific implementation process 2 of the method includes:
  • the UE resides in a network composed of multiple TRPs at a single frequency point, and each TRP is a cell;
  • Step 1 The UE first camps on the cell 1 and initiates random access through the cell 1;
  • Step 2 If the random access fails N times before, or the random access fails, the UE directly cuts the signal strength to the second strongest cell 2;
  • Step 3 The UE initiates a subsequent random access procedure directly in the cell 2 (corresponding to the first N times of failures), or re-initiates the random access procedure (corresponding to the entire random access procedure access failure).
  • the embodiment of the present disclosure can improve the success rate and real-time performance of the retransmission when the terminal randomly accesses the network by replacing another network access point, thereby ensuring the random access transmission delay requirement of the specific service, and the overall random connection. Delay requirements.
  • some embodiments of the present disclosure provide a random access method, including:
  • Step 101 The terminal resides in a network in which a single frequency point is composed of multiple network access points, and at least one of the multiple network access points forms a cell, and the network that resides from the terminal Obtaining, by the system message block sent by the access point, a first random access configuration resource corresponding to the network access point accessed by the terminal, and a second random access configuration resource corresponding to the cell;
  • Step 102 After the access failure occurs in the random access process according to the first random access configuration resource, the terminal performs a re-random access network according to the second random access configuration resource after the network access point that the terminal camps on according to the first random access configuration resource. Or, after the terminal fails in the random access process according to the second random access configuration resource, the terminal performs the re-random access network according to the first random access configuration resource.
  • the UE resides in a network consisting of multiple TRPs.
  • the multiple TRPs form a cell and are managed by the NB (Node B).
  • the specific implementation process of the method includes:
  • Step 1 The network allocates two levels of RACH (random access channel) resources to the UE through the SIB (system information block);
  • Step 2 The UE first camps on the TRP and initiates random access through the TRP level RACH resource;
  • the random access procedure is used for transmission and reception through TRP related reference signals;
  • Step 3 After the random access failure of the TRP level, the random access procedure is initiated by the RACH resource at the cell level; the random access procedure is used for transmission and reception by using the cell level reference signal.
  • the UE may also be switched to use the TRP-level RACH resource to initiate random access.
  • the embodiment of the present disclosure implements random access at the TRP level in a scenario in which a plurality of TRPs form a cell in a network in which a single frequency point is composed of multiple TRPs, and is managed by the NB (Node B).
  • the random access procedure is initiated by the RACH resource at the cell level; the random access procedure may be initiated by using the RACH resource at the cell level, and after the access failure, the random access may be initiated by using the RACH resource of the TRP level; Therefore, the success rate and real-time performance of the retransmission when the terminal randomly accesses the network can be improved, thereby ensuring the random access transmission delay requirement of the specific service and the delay requirement of the overall random access.
  • some embodiments of the present disclosure provide a random access method, including:
  • Step 131 After the access failure of the terminal accessing the network process fails, when the number of the detected MSG1 is greater than the preset value, the backoff time parameter used by the random access network is obtained; or the terminal randomly accesses After the network process fails to access, the signal strength is monitored on the preset channel, and when the signal strength is higher than the preset signal strength value, the backoff time parameter used by the random access network is obtained;
  • Step 132 After the terminal retreats for a period of time, the terminal initiates a random access procedure.
  • the specific implementation process of the method includes: after the initial random access fails,
  • the UE monitors the signal strength or the Msg1 sent by other users on the Msg1 or the special channel before initiating the random access procedure;
  • the random access procedure is directly initiated, otherwise, the random access process is initiated, or the random access process is initiated, or Continue LBT monitoring to initiate a random access procedure.
  • some implementations of the present disclosure provide a random access method, including:
  • Step 141 Monitor a load indication sent by the network, and obtain a backoff time parameter used by the random access network again when the load indication indicates that the network load exceeds a preset load value.
  • Step 142 After the terminal retreats for a period of time, the terminal initiates a random access procedure.
  • the specific implementation process of the method includes: after the initial random access fails,
  • the network displays a load indication to the UE.
  • the UE determines whether to initiate random access according to the indication, and reads the load information again if the T time is not returned.
  • the terminal passes the interception mechanism, so that after the access fails, the terminal retreats for a period of time, and then performs random access, thereby improving the success rate and real-time performance of the retransmission when the terminal randomly accesses the network, thereby ensuring specific The random access transmission delay requirement of the service and the delay requirement of the overall random access.
  • some embodiments of the present disclosure provide a method for random access, including:
  • Step 151 Acquire a first random access configuration resource that is carried by the network through the system message block.
  • Step 152 After the initial random access procedure fails according to the first random access configuration resource, obtain a backoff time parameter indication.
  • the backoff time parameter indication may be obtained by using the MSG2 message or by using the system message block or by listening to the air interface message or by using the backoff time parameter indication of the initial transmission;
  • Step 153 Obtain a backoff time according to the backoff time parameter indication.
  • the backoff time corresponding to the current number of transmissions may be obtained according to the correspondence between the backoff time parameter indication and the number of transmissions; or the backoff time may be obtained according to the backoff time parameter indication, the number of transmission times, and the superposition coefficient; or according to the backoff
  • the time parameter indicates a correspondence relationship with a service of a different delay requirement attribute, and obtains a back time corresponding to the current service;
  • Step 154 After the terminal retreats for a period of time, the terminal enters the random access network again.
  • the specific random access procedure includes:
  • Step 1 The UE acquires RACH (Random Access Channel) configuration Cfg-1 through system information;
  • Step 2 The UE initiates a random access procedure by using a Cfg-1 configuration.
  • Step 3 If the UE can pass the system information or the information of the air interface in advance, or the BI parameter of the initial transmission, the BI parameter is used to perform the back-off processing and then initiate the random access process;
  • Step 4 the UE receives Msg2, which carries BI;
  • Step 5 According to the current number of transmissions, the UE searches for the actual value corresponding to the BI according to the number of times, and performs a backoff rollback.
  • the search process may be performed according to a corresponding table with different transmission times, or may be based on a backoff time parameter indication.
  • the number of transmissions and the superposition coefficient are calculated by superimposing, or the corresponding relationship between the service with different delay requirement attributes according to the backoff time parameter indication, and the actual value corresponding to the BI is obtained;
  • Step 6 After the certain time is returned, the UE re-initiates the random access process; wherein, the number of different transmissions
  • the corresponding table or coefficient can be configured to the UE by signaling.
  • the different transmission times correspond to different backoff time lengths, that is, if one transmission fails, the length of one back-off time is A, the two transmissions fail, and the length of one back-off time is B.
  • the three transmissions fail, and the length of one rollback time is C, where A, B, and C are different from each other.
  • the terminal passes the fallback mechanism, so that after the access fails, the terminal retreats for a period of time, and then performs random access, thereby improving the success rate and real-time performance of the retransmission when the terminal randomly accesses the network.
  • the terminal passes the fallback mechanism, so that after the access fails, the terminal retreats for a period of time, and then performs random access, thereby improving the success rate and real-time performance of the retransmission when the terminal randomly accesses the network.
  • the access configuration resource when the changed access configuration is configured to access the configuration resource, the access configuration resource may include a time-frequency resource of the random access channel, a home network transmission point, an uplink synchronization code, or a preamble preamble sequence.
  • the coded resource can be carried in the Msg2 message, and the random access resource required for the retransmission carried by the Msg2 can be carried in any Msg2 message.
  • different backoff parameters (controlling the time when the UE performs preamble retransmission) are used to perform rollback, and then random access is initiated; the eNodeB informs the UE of a backoff value by using a random access response, and the UE needs For preamble retransmission, a value is randomly selected between 0 and the backoff value as the backoff time, and the preamble retransmission is performed after the backoff time is over.
  • the different fallback parameters may be: 1) different backoff parameters to different services; 2) different transmission times to different backoff parameters; Backoff parameters may be displayed to specific values, or may be the same BI, different services or different transmission times are mapped to different values;
  • the backoff value of the initial access needs to be known when the UE is initially accessed, and the value may be notified to the UE by using L1/L2/L3 signaling;
  • the overload control requirement of the RACH is looser than that of the previous mobile communication system, because in LTE, the random access occupies a separate time-frequency resource and does not interfere with other uplink channels.
  • the collision probability of the RACH is at a relatively low level, but also because the UE accessing on one PRACH is too large, causing the UE to have a leading collision and the access fails.
  • a fallback mechanism is introduced in LTE to control the time when the UE performs preamble retransmission.
  • the eNodeB informs the UE of a backoff value by using a random access response. If the UE needs to perform preamble retransmission, the UE randomly selects a value between 0 and the backoff value as the backoff time, and after the backoff time ends. Perform a pre-retransmission.
  • the replaced random access configuration may be adopted or the access may be re-opened after a period of time. Therefore, the success rate and real-time performance of the retransmission when the terminal randomly accesses the network are improved, the random transmission delay requirement of the specific service is ensured, and the delay requirement of the overall random access is required.
  • Some embodiments of the present disclosure also provide a terminal, including:
  • the obtaining module is configured to obtain a replacement access configuration that is adopted when the terminal randomly accesses the network after the random access network process;
  • the access module is configured to perform a random access network again according to the replaced access configuration adopted by the re-random access network after the access failure in the random access network process.
  • the access module performs a re-random access network according to the replaced access configuration adopted by the re-random access network after the N access fails in the random access network process;
  • N the maximum number of accesses in the entire random access procedure.
  • the access failure in the process of the terminal accessing the network includes: the random access sequence sent by the terminal fails to be sent or the conflict resolution process in the random access network fails.
  • the replaced access configuration used by the re-random access network includes: a random access resource configuration or a fallback parameter in a random access procedure.
  • the acquiring module of the re-random access network includes: when the other random access resources are configured under the same network access point, the acquiring module includes:
  • a first acquiring unit configured to acquire a first random access configuration resource used by a terminal that is sent by a network access point by using a broadcast message in a random access network process, and a second random access that is used by the random access network again Configure resources;
  • a second acquiring unit configured to acquire a first random access configuration resource that is carried by the network access point by using the system message block, and perform a random access network process according to the first random access configuration resource, and obtain a random access again.
  • a second random access configuration resource used by the network
  • the first random access configuration resource is different from the second random access configuration resource.
  • the second obtaining unit acquires a second random access configuration resource that is sent by the network access point by using an MSG2 message or L1/L2 signaling.
  • the access module is specifically configured to:
  • the random access process is stopped, and the random access process is re-initiated according to the second random access configuration resource used by the random access network;
  • the first random access configuration resource is replaced with the second random access configuration resource, and the resource is re-configured according to the second random access configuration resource used by the re-random access network. Initiate a random access procedure.
  • the access module is further configured to: after the random access to the network is successful, discard the second random access configuration resource, and restore the configuration of the first random access configuration resource.
  • the acquiring module is specifically configured to: when the random access resource configured by the re-random access network is configured to be a frequency of the replacement,
  • the terminal uses the first frequency to perform a random access network in the high and low frequency overlapping coverage area of the network, and acquires the second frequency used by the random access network again after the access failure in the random access network process;
  • the first frequency is a frequency within a frequency range employed by the high frequency region
  • the second frequency is a frequency within a frequency range employed by the low frequency region
  • the first frequency is a frequency within a frequency range employed by the low frequency region
  • the second frequency is a frequency within a frequency range employed by the high frequency region.
  • the acquiring module is specifically configured to: when the random access resource used in the re-random access network is configured as a network access point after the replacement,
  • the terminal resides in a network in which a single frequency point is composed of multiple network access points, and performs a random access network process in the first cell in the network, and after the access fails, triggers the cell reselection process to obtain a new The selected second cell in the network or directly acquires a second cell whose signal strength is different from the signal strength of the first cell; wherein one network access point is a cell.
  • the acquiring module is specifically configured to: when the random access resource used in the re-random access network is configured as a network access point after the replacement,
  • the terminal resides in a network in which a single frequency point is composed of multiple network access points, and at least one of the multiple network access points forms a cell, and the network access point residing from the terminal
  • the first random access configuration resource corresponding to the network access point accessed by the terminal and the second random access configuration resource corresponding to the cell are obtained in the sent system message block.
  • the access module is specifically configured to:
  • the terminal randomly accesses the network access point where it resides according to the first random access configuration resource. After the access failure in the process, the second random access configuration resource is used to perform the random access network again;
  • the terminal After the access failure occurs in the cell in which the terminal is located according to the second random access configuration resource, the terminal performs the re-random access network according to the first random access configuration resource.
  • the acquiring module is specifically configured to: when the random access resource configured by the re-random access network is configured as the access configuration in the interception mechanism,
  • the backoff time parameter used by the random access network is obtained;
  • the signal strength is monitored on the preset channel, and when the signal strength is higher than the preset signal strength value, the backoff time parameter used by the random access network is obtained.
  • the acquiring module is specifically configured to: when the random access resource configured by the re-random access network is configured as the access configuration in the interception mechanism,
  • the acquiring module of the re-random access network includes: when the back-off parameter is in the random access process, the acquiring module is specifically configured to:
  • the backoff time is obtained according to the backoff time parameter indication.
  • the obtaining the back-off time parameter indicates that the back-off time parameter indication is obtained by using the MSG2 message or by the system message block or by the intercepted air interface message or by the back-off time parameter indication of the initial transmission.
  • the obtaining module is specifically configured to: when the backoff time is obtained according to the backoff time parameter indication:
  • the embodiment of the terminal is a device corresponding to the above method, and all implementations of the foregoing method embodiments are applicable to the embodiment of the device, and the same technical effects can be achieved.
  • a terminal including:
  • the transceiver is configured to acquire a replacement access configuration that is adopted when the terminal randomly accesses the network after the random access network process;
  • the processor is configured to perform a random access network again according to the replaced access configuration adopted by the re-random access network after the access failure in the random access network process.
  • the processor is connected to the memory; the memory is configured to store the program and data used by the processor when performing the operation; and the acquisition terminal randomly accesses the network after the random access network process The replaced access configuration adopted; when the processor invokes and executes the program and data stored in the memory, after the access failure in the random access network process, according to the replacement used by the random access network again The access configuration is performed to access the network again.
  • the bus architecture can include any number of interconnected buses and bridges that can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art. Therefore, it will not be further described in this article.
  • the transceiver can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the processor is responsible for managing the bus architecture and the usual processing, and the memory can store the data that the processor uses when performing operations.
  • the processor After the N access fails, the processor performs a re-random access network according to the replaced access configuration adopted by the re-random access network after the N access fails.
  • N the maximum number of accesses in the entire random access procedure.
  • the access failure in the process of the terminal accessing the network includes: the random access sequence sent by the terminal fails to be sent or the conflict resolution process in the random access network fails.
  • the replaced access configuration used by the re-random access network includes: a random access resource configuration or a fallback parameter in a random access procedure.
  • the replacement access configuration used by the re-random access network includes: when other random access resources are configured under the same network access point, the transceiver is specifically configured to: obtain a network access point to broadcast The first random access configuration adopted by the terminal for message transmission in the process of random access network And the second random access configuration resource used by the network to access the network again; or the first random access configuration resource carried by the network access point through the system message block, according to the first random access configuration resource After the random access network process fails, the second random access configuration resource used by the random access network is obtained. The first random access configuration resource is different from the second random access configuration resource.
  • the transceiver acquires a second random access configuration resource that is sent by the network access point by using an MSG2 message or L1/L2 signaling.
  • the processor is specifically configured to: after the access failure in the random access network process, stop the random access process, and re-initiate the random connection according to the second random access configuration resource used by the random access network again. After the access fails in the random access network process, the first random access configuration resource is replaced with the second random access configuration resource, and the second random connection is adopted according to the re-random access network. The configuration resource re-initiates the random access procedure.
  • the processor is further configured to: after the random access to the network is successful, discard the second random access configuration resource, and restore the configuration of the first random access configuration resource.
  • the transceiver is specifically configured to: the terminal is in the high and low frequency overlapping coverage area of the network, when the random access resource used in the re-random access network configuration is configured as the frequency of the replacement. After the random access network is performed by using the first frequency, and the access fails in the random access network process, acquiring the second frequency used by the random access network again;
  • the first frequency is a frequency in a frequency range adopted by the high frequency region
  • the second frequency is a frequency in a frequency range adopted by the low frequency region; or the first frequency is within a frequency range adopted by the low frequency region Frequency, the second frequency being a frequency within a frequency range employed by the high frequency region.
  • the transceiver is specifically configured to: the terminal resides in a single frequency, when the random access resource used in the re-random access network is configured as a network access point after the replacement. Pointing in a network consisting of multiple network access points, and performing a random access network process in the first cell in the network, and after failing to access, triggering a cell reselection process to obtain a reselected network in the network.
  • the transceiver is specifically configured to: the terminal resides in a single frequency, when the random access resource used in the re-random access network is configured as a network access point after the replacement. Pointing into a network consisting of multiple network access points, and at least one of the plurality of network access points The access point forms a cell, and the first random access configuration resource corresponding to the network access point accessed by the terminal and the second corresponding to the cell are obtained from the system message block sent by the network access point where the terminal resides. Random access configuration resources.
  • the processor is specifically configured to: after the access failure occurs in the random access process according to the first random access configuration resource, the processor is configured to allocate resources according to the second random access Re-randomly accessing the network again; or the terminal in the cell in which it resides, after performing the access failure in the random access process according to the second random access configuration resource, performing randomization again according to the first random access configuration resource Access to the network.
  • the transceiver is specifically configured to: the terminal randomly accesses the network process when the random access resource used in the re-random access network configuration is configured as the access configuration in the interception mechanism. After the failure, if the number of MSG1 detected in the predetermined length of time is greater than the preset value, the backoff time parameter used by the random access network is obtained again; or after the terminal randomly fails to access the network, the preset is preset.
  • the signal strength is monitored on the channel, and when the signal strength is higher than the preset signal strength value, the backoff time parameter used by the random access network is obtained.
  • the transceiver is specifically configured to: monitor a load indication sent by the network, when the random access resource configured by the re-random access network is configured as an access configuration in a listening mechanism; When the load indication indicates that the network load exceeds a preset load value, acquiring a backoff time parameter used by the random access network again.
  • the replacement access configuration adopted by the re-random access network includes: when the back-off parameter is in the random access process, the transceiver is specifically configured to: acquire the first random that is carried by the network through the system message block. Accessing the configuration resource; after the initial random access procedure fails according to the first random access configuration resource, obtaining a backoff time parameter indication; and obtaining a backoff time according to the backoff time parameter indication.
  • the obtaining the back-off time parameter indicates that the back-off time parameter indication is obtained by using the MSG2 message or by the system message block or by the intercepted air interface message or by the back-off time parameter indication of the initial transmission.
  • the transceiver When the transceiver obtains the backoff time according to the backoff time parameter, the transceiver is specifically configured to obtain a backoff time corresponding to the current number of transmissions according to the correspondence between the backoff time parameter indication and the number of transmissions; or
  • the new access mode is used to perform the random access network again, and the replaced random access configuration may be adopted or the access may be re-opened for a period of time, thereby performing the access again.
  • the success rate and real-time performance of retransmission when the terminal randomly accesses the network ensure the random transmission delay requirement of a specific service, and the delay requirement of the overall random access.
  • the disclosed method and apparatus 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.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the above software functional unit is stored in a storage medium and includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the transceiving method of the various embodiments of the present disclosure.
  • 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, and the program code can be stored. Medium.
  • 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 relève du domaine technique des communications. L'invention concerne un procédé et un terminal d'accès aléatoire. Le procédé consiste à : obtenir une configuration d'accès modifiée utilisée après que le terminal accède de nouveau et aléatoirement à un réseau après un processus d'accès aléatoire au réseau; et après que le terminal présente un échec d'accès dans le processus d'accès aléatoire au réseau, le terminal accède de nouveau aléatoirement au réseau selon la configuration d'accès modifiée utilisée après que le terminal a accédé de nouveau aléatoirement au réseau.
PCT/CN2017/094358 2016-08-05 2017-07-25 Procédé et terminal d'accès aléatoire Ceased WO2018024136A1 (fr)

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