WO2020098730A1 - Procédé de migration d'équipement utilisateur, unité centralisée, unité de distribution et système - Google Patents

Procédé de migration d'équipement utilisateur, unité centralisée, unité de distribution et système Download PDF

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Publication number
WO2020098730A1
WO2020098730A1 PCT/CN2019/118325 CN2019118325W WO2020098730A1 WO 2020098730 A1 WO2020098730 A1 WO 2020098730A1 CN 2019118325 W CN2019118325 W CN 2019118325W WO 2020098730 A1 WO2020098730 A1 WO 2020098730A1
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Prior art keywords
cell
load
migration
list
migrated
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PCT/CN2019/118325
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English (en)
Chinese (zh)
Inventor
田路晓
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/087—Reselecting an access point between radio units of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • 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

Definitions

  • This application relates to the communication field, for example, to a user equipment migration method, centralized unit, distributed unit, and system.
  • the 5rd Generation mobile communication system (the 5rd Generation mobile communication system, 5G) has come into people's eyes.
  • 5G Radio Access Network (RAN) architecture the 3rd Generation Partnership Project (3GPP) passed the Central Unit / Distributed Unit (CU / DU) architecture solution .
  • CU mainly deals with non-real-time wireless high-level protocol stack functions
  • DU mainly deals with physical layer functions and layer 2 functions required for real-time performance.
  • CU and DU complete signaling and data transmission through the F1 interface.
  • CU and DU are separated, the realization of some conventional business functions becomes complicated.
  • load balancing function Take the load balancing function as an example.
  • UE User Equipment
  • PRB physical resource block
  • Modulation modulation coding order
  • MCS Coding Scheme
  • UE air separation information are generally important reference indicators.
  • the DU because of functional division, only the DU knows the PRB, MCS, and space division information of each UE. Only the CU knows the load of the neighboring cell, and the UE's migration process is also controlled by the CU.
  • the DU needs to report the PRB occupancy, MCS, and space division information of each UE to the CU through the F1 interface. Because there are a large number of DUs under the CU, there are multiple cells under each DU, and there are thousands of users under each cell. If the DU reports this information to the CU, the amount of messages is large. In particular, the number of PRBs occupied by users, MCS, and air separation status will change from time to time, so it is possible that the DU may report this information to the CU multiple times. Because the amount of reported information is too large, it puts extra pressure on the F1 interface, which may affect normal services.
  • Embodiments of the present application provide a user equipment migration method, centralized unit, distribution unit, and system, so as to at least solve the problem of UE migration in the related art.
  • An embodiment of the present application provides a user equipment migration method, which includes: a CU receives a migrated UE list sent by a DU; and the CU performs neighbor cell migration on a UE in the migrated UE list.
  • the CU receiving the migrated UE list sent by the DU includes: the CU receives the migrated UE list indication message sent by the DU, wherein the migrated UE list indication message carries the migrated UE list and the migration reason value.
  • the CU performing neighbor cell migration on the UE in the migrated UE list includes: the CU acquiring the low-load neighbor cell or high priority of the first cell to which the UE in the migrated UE list belongs Neighboring cell, wherein the low-load neighboring cell is a neighboring cell with a load lower than a preset threshold or a neighboring cell with a load ratio lower than a preset threshold, and the high-priority neighboring cell has a priority higher than a preset priority Neighboring cell; the CU migrates the UE in the migrated UE list to the low-load neighboring cell or the high-priority neighboring cell according to the configured migration switching strategy.
  • the CU migrates the UEs in the migrated UE list to the low-load neighbor cell or the high-priority neighbor cell according to the configured migration handover strategy, including one of the following:
  • the migration handover strategy is In the case of blind handover, the CU issues a handover instruction to a UE in the migrated UE list to switch the UE to the low-load neighbor cell or the high-priority neighbor cell, where the handover command Carries low-load neighbor information or high-priority neighbor information; when the migration switching strategy is redirection, the CU issues a redirection instruction to the UE in the migrated UE list to reset the UE Directed to the low-load neighboring zone or the high-priority neighboring zone, wherein the redirection instruction carries the frequency information of the low-load neighboring zone or the high-priority neighboring zone; In the case of measurement-based handover, the CU issues a measurement instruction for neighboring cells to the UE in the migrated UE list, and switches the
  • the method before the CU receives the migrated UE list sent by the DU, the method further includes: the CU collects the load of all neighboring cells of the first cell, and according to the load of all neighboring cells, A low-load neighbor cell of the first cell is selected from the cell; wherein, the first cell is a cell to be migrated by the UE notified by the DU, and the low-load neighbor cell is a neighbor whose load is lower than a preset threshold The CU notifies the DU of the frequency information of the low-load neighboring cell.
  • the CU collects the load of all neighboring cells of the first cell, including at least one of the following: the CU sends a resource collection request to the neighboring cell of the first cell, and receives the cell load reported by the neighboring cell Report; the CU sends a resource collection request to the DU and receives the cell load report reported by the DU; the CU sends a resource collection request to other CUs and receives the cell load report reported by the other CU.
  • the resource collection request includes at least one of the following: the identifier of the neighboring area where the load needs to be collected, the type of load that needs to be collected, the load reporting method, and the load reporting period.
  • An embodiment of the present application further provides a user equipment migration method, including: a DU monitoring the status of a UE in a first cell, and adding a UE in the first cell that meets the migration policy to the list of migrated UEs; The CU sends the migrated UE list.
  • the eviction strategy includes at least one of the following: UEs whose physical resource block PRB occupancy rate exceeds a set threshold; UEs whose packet error rate exceeds a set threshold; UEs that do not include a specified service; resources cannot satisfy the service UE with required quality of service QoS; UE with lower priority than the set priority.
  • the method before the DU monitors the status of the UE in the first cell and adds the UE in the first cell that meets the migration policy to the list of migrated UEs, the method further includes: the DU monitoring the DU The load situation of multiple cells notifies the CU of the first cell to be migrated by the UE, where the first cell is a cell whose load is higher than a first preset threshold.
  • notifying the CU of the first cell to be migrated by the UE includes: when the DU satisfies the trigger condition, the DU sends a load indication message to the CU to migrate the pending UE
  • the first cell notifies the CU, wherein the trigger condition includes at least one of the following: a newly added high-load cell is found, and a load change that has been reported to the high-load cell has reached a second preset threshold.
  • the load indication message includes at least one of the following: a cell identification ID, a cell load status, a cell uplink residual load, and a cell downlink residual load.
  • adding the UE that conforms to the migration policy in the first cell to the migrated UE list includes the DU adding the migration that conforms to the migration policy in the first cell and supporting migration to a low-load neighbor cell
  • the UE of at least one frequency point is added to the list of migrated UEs, wherein the low-load neighbor cell is a neighbor cell of all the neighbor cells of the first cell indicated by the CU whose load is lower than a third preset threshold .
  • An embodiment of the present application further provides a centralized unit CU, including: a receiving module configured to receive a migration UE list sent by a distribution unit DU; a migration module configured to perform neighbor cell migration on the UEs in the migrated UE list.
  • the receiving module is configured to receive a migration UE list indication message sent by a DU, where the migration UE list indication message carries a migration UE list and a migration reason value.
  • the migration module includes: an acquisition unit configured to acquire a low-load neighbor cell or a high-priority neighbor cell of the first cell to which the UE in the migrated UE list belongs, wherein the low-load neighbor cell Is a neighboring cell with a load lower than a preset threshold or a neighboring cell with a load ratio lower than a preset threshold, the high-priority neighboring cell is a neighboring cell with a priority higher than the preset priority; the migration unit is set to The migration switching strategy migrates the UEs in the migrated UE list to the low-load neighbor cell or the high priority neighbor cell.
  • the migration unit is configured to migrate UEs in the migrated UE list to the low-load neighboring zone or high-priority neighboring zone according to the configured migration switching strategy in one of the following ways: during migration switching When the strategy is blind handover, a handover instruction is issued to the UE in the migrated UE list to switch the UE to the low-load neighbor cell or the high-priority neighbor cell, wherein, in the handover command Carries low-load neighbor information or high-priority neighbor information; when the migration switching strategy is redirection, a redirection instruction is issued to the UE in the migrated UE list to redirect the UE to the A low-load neighboring cell or the high-priority neighboring cell, wherein the redirection instruction carries the frequency information of the low-load neighboring cell or the high-priority neighboring cell; the migration switching strategy is based on measurement In the case of handover, a measurement instruction for a neighbor cell is issued to the UE in the migrated UE list, and according to the
  • the migration module further includes: a collection unit configured to collect the loads of all neighboring cells of the first cell, and filter out the first neighboring cells according to the loads of all neighboring cells A low-load neighboring cell of a cell, notifying the DU of frequency information of the low-load neighboring cell, wherein the first cell is a cell to be relocated by the UE notified by the DU, and the low-load neighboring cell It is the neighboring area where the load is lower than the preset threshold.
  • a collection unit configured to collect the loads of all neighboring cells of the first cell, and filter out the first neighboring cells according to the loads of all neighboring cells A low-load neighboring cell of a cell, notifying the DU of frequency information of the low-load neighboring cell, wherein the first cell is a cell to be relocated by the UE notified by the DU, and the low-load neighboring cell It is the neighboring area where the load is lower than the preset threshold.
  • An embodiment of the present application further provides a distribution unit DU, including: a monitoring module configured to monitor the status of the UE in the first cell, and add the UE in the first cell that meets the migration policy to the list of migrated UEs; send The module is configured to send the migrated UE list to the centralized unit CU.
  • a monitoring module configured to monitor the status of the UE in the first cell, and add the UE in the first cell that meets the migration policy to the list of migrated UEs; send The module is configured to send the migrated UE list to the centralized unit CU.
  • the eviction strategy includes at least one of the following: UEs with PRB occupancy rate exceeding the set threshold; UEs with packet error rate exceeding the set threshold; UEs without specified service; resources that cannot meet the QoS requirements of the service UE; the priority is lower than the set priority UE.
  • the monitoring module is further configured to monitor the load of multiple cells under the DU and notify the CU of the first cell to be migrated by the UE, where the first cell is the load Cells above the first preset threshold.
  • the monitoring module is configured to notify the CU of the first cell to be migrated by the UE in the following manner: when a trigger condition is met, a load indication message is sent to the CU to notify The first cell notifies the CU, wherein the trigger condition includes at least one of the following: a newly added high-load cell is found, and a load change that has been reported to the high-load cell has reached a second preset threshold.
  • the load indication message includes at least one of the following: cell ID, cell load status, cell uplink residual load, and cell downlink residual load.
  • the monitoring module is configured to add UEs in the first cell that comply with the migration policy to the list of migrated UEs by adding the UEs in the first cell that conform to the migration policy and supporting migration to low A UE with at least one frequency point of a load neighboring cell is added to the list of migrated UEs, wherein the low load neighboring cell is the load indicated by the CU in all neighboring cells of the first cell that is lower than a third preset threshold Neighborhood.
  • a user equipment migration system including a centralized unit CU and a distributed unit DU in any embodiment of the present application.
  • FIG. 1 is a schematic diagram of a CU / DU architecture of a 5G base station provided by an embodiment of the present application;
  • FIG. 2 is a flowchart of a user equipment migration method provided by an embodiment of the present application.
  • FIG. 3 is a flowchart of a DU-triggered UE migration method provided by an embodiment of the present application.
  • FIG. 4 is a flowchart of a UE migration method for CU indicating low-load frequency information provided by an embodiment of the present application
  • FIG. 5 is a flowchart of another UE migration method provided by an embodiment of the present application.
  • FIG. 6 is a flowchart of another UE migration method provided by an embodiment of the present application.
  • FIG. 7 is a flowchart of another UE migration method provided by an embodiment of the present application.
  • FIG. 8 is a flowchart of another UE migration method provided by an embodiment of the present application.
  • FIG. 9 is a flowchart of a cell load collection method provided by an embodiment of the present application.
  • FIG. 10 is a structural block diagram of a centralized unit CU provided by an embodiment of the present application.
  • FIG. 11 is a structural block diagram of a distribution unit DU provided by an embodiment of the present application.
  • FIG. 1 is a schematic diagram of the CU / DU architecture of a 5G base station.
  • the 5G base station may include one or more CUs (only CU1 and CU2 are shown in FIG. 1), and the CUs are connected through an Xn interface.
  • Each CU is connected to one or more DUs (for example, DU1 to DUn) to which it belongs through an F1 interface.
  • the structure shown in FIG. 1 is only an illustration, which does not limit the CU / DU architecture of the 5G base station described above.
  • FIG. 2 is a flowchart of a user equipment migration method according to an embodiment of the present application. As shown in FIG. 2, the process includes the following steps:
  • step S202 the CU receives the migrated UE list sent by the DU.
  • Step S204 the CU performs neighbor cell migration on the UE in the migrated UE list.
  • the DU may set the UE migration policy, and the migration policy may be set according to actual needs.
  • the migration policy may include but not limited to the following strategies and combinations of strategies:
  • the DU receives a message from the CU that the selected UE should support migration to at least one frequency specified by the CU.
  • the DU is responsible for selecting the migrated UE list according to the strategy, and the CU is responsible for migrating the UE selected by the DU to a suitable neighboring cell.
  • the DU can independently select the UE to migrate according to the scheduling strategy, which can satisfy multiple scheduling strategies Reason for UE migration.
  • the number of migrated UEs selected by the DU is relatively small.
  • the DU only reports these UEs that meet the conditions to the CU, and the CU controls the migration process. Avoiding the DU reporting a large amount of UE scheduling related information to the CU can greatly reduce the amount of information exchanged through F1, greatly reduce the load on the F1 port, and achieve load balancing without increasing the pressure on the F1 interface.
  • An embodiment of the present application also provides a DU-triggered UE migration method. As shown in FIG. 3, the method includes the following steps:
  • step S3010 after learning the migration policy or principle, the DU monitors the status of all UEs in the cell in real time, and identifies UEs that meet the migration policy as a UE list.
  • step S3020 the DU sends the UE list composed of UEs to be migrated to the CU through the F1 message "DU migration UE list indication" message, and the message includes the migrated UE list.
  • step S3030 after receiving the message, the CU will process according to the pre-set strategy according to the migrated UE list in the message, including but not limited to blind handover, measurement-based handover, and redirection.
  • the operation of each UE in the UE migration list carried in the "DU migration UE list indication" message is as follows:
  • the configured strategy is blind handover, a handover command is directly issued to the UE (the handover command has low-load neighbor information or high-priority neighbor information). If the configured strategy is redirection, a redirection instruction is directly issued to the UE (the instruction has information such as the frequency of a low-load neighbor or the frequency of a high-priority neighbor). If the configured strategy is based on measurement handover, then for each UE's measurement instruction for the neighboring cell, when the UE reports the measurement report, indicating that the signal of the neighboring cell is strong enough, the UE may be sent to the neighboring cell indicated by the measurement report instruction.
  • the CU migrates the UE in the migrated UE list indicated by the "DU migrated UE list indication" message to a low-load neighbor cell or a high priority neighbor cell according to the configured strategy.
  • the migration is completed through the redirection or switching process specified in the standard agreement.
  • An embodiment of the present application also provides a UE migration method in which the CU indicates low-load frequency information.
  • UE migration in a specific scenario of load balancing is used as an example.
  • the CU in order to ensure that the UE selected by the DU can migrate to a suitable neighbor cell as much as possible, the CU can notify the DU of the frequency information of the neighbor cell through the F1 interface.
  • the frequency information of the neighbor cell is used as a reference for the DU to select the UE to migrate to One of the factors is to ensure that the selected UE list supports migration to these frequencies.
  • the CU may not always collect neighbor load information. When the DU needs to actively migrate services, it can notify the CU to collect neighbor load through the F1 interface in advance.
  • the UE migration method provided in this implementation includes the following steps:
  • Step S4010 the DU sends a "DU load indication" message to the CU. If the message is initiated by the DU, it indicates to the CU that the load status of the cell under the DU has changed (for example, the load changes from low to high or the load changes from high to low) to facilitate the CU to trigger Reasonable load balancing behavior. For example, when the load changes from low to high, the CU can collect the neighbor cell load of the cell, find the low load neighbor cell, and migrate some of the services under the high load cell to the low load neighbor cell; if the load changes from high to low, the CU can stop Collect the load of the neighboring area.
  • the message is initiated by the DU, it indicates to the CU that the load status of the cell under the DU has changed (for example, the load changes from low to high or the load changes from high to low) to facilitate the CU to trigger Reasonable load balancing behavior. For example, when the load changes from low to high, the CU can collect the neighbor cell load of the cell, find the low
  • the content of the message may include a cell identifier (ID), cell load status (high, medium, and low), cell uplink residual load, cell downlink residual load, and so on.
  • ID cell identifier
  • cell load status high, medium, and low
  • cell uplink residual load cell downlink residual load
  • the DU monitors the load of multiple cells under its own name in real time, and determines whether it is a high-load cell in time according to a preset threshold obtained from the background.
  • the DU finds that there are one or more high-load cells, it notifies the CU through the "DU Load Indication" message.
  • This message is only triggered (including but not limited to): Discover new high-load cells (according to the preset threshold) Judgment); the high-load cell that has been reported becomes a low-load cell (judgment according to a preset threshold); the high-load cell that has been reported becomes a higher-load cell (judgment according to a preset threshold).
  • Step S4020 after receiving the "DU load indication" message, the CU will perform load balancing preparation work, including: 1) recording the high-load cells reported by the DU; 2) for each high-load cell, the CU obtains the load of all its neighboring cells , And can filter out low-load neighbors according to the preset threshold.
  • step S4030 the CU sends the acquired information such as the frequency point of the low-load neighboring cell of the high-load cell to the corresponding DU through the "CU low-load neighboring cell frequency information indication" message to assist the DU in choosing to migrate the UE.
  • Step S4040 after acquiring the "CU low-load neighbor frequency information indication" message, the DU selects to migrate the UE according to the set strategy and low-load frequency information.
  • step S4050 the DU sends the UE list to be migrated to the CU through the F1 message "DU migration UE list indication" message, and the message includes the migrated UE list.
  • This step may be the same as step S302 in the embodiment of FIG. 3, and details are not described here.
  • step S4060 after receiving the message, the CU will migrate the UEs in the migrated UE list using a preset strategy according to the migrated UE list in the message, including but not limited to blind handover, measurement-based handover, and redirection.
  • This step may be the same as step S303 in the embodiment of FIG. 3, and details are not described here.
  • Embodiment 1 of the present application provides a UE migration method.
  • CU1-> DU1-> Cell_1 represents the Cell_1 cell of DU1 under CU1, and the relationship between other cells and DUs and CUs can be deduced by analogy, which is not enumerated here.
  • the following conditions are preset:
  • the cell Cell_1 is configured with a high load threshold such that the PRB occupancy rate reaches 80% of the available resources of the cell.
  • the cell Cell_1 configures a UE migration out selection strategy to select a UE whose PRB occupancy rate exceeds 5%.
  • the cell Cell_1 has two neighboring cells, which are:
  • the UE migration method in this embodiment includes the following steps:
  • step S5010 DU1 detects that the PRB occupancy rate of the cell Cell_1 exceeds 80%.
  • Step S5020 DU1 starts to screen UEs to be migrated in the cell Cell_1.
  • the set condition 2) only UE0 and UE1 meet the migration conditions, so DU1 selects UE0 and UE1 to send to CU1, and requests CU1 to migrate UE0 and UE1. High load.
  • Step S5030 after receiving the relocation request, CU1 finds that the reason for the relocation is high cell load, and the cell Cell_1 has a low-load neighbor Cell_M, then CU1 initiates a migration process to the neighbor cell Cell_M for UE0 and UE1 respectively. Direct switching, measurement switching, redirection, etc.
  • Step S5040 after receiving the relocation instruction, UE0 and UE1 relocate to the cell CU1-> DUn-> Cell_M indicated by the relocation instruction.
  • the DU triggers the migration of the UE.
  • the following conditions are preset:
  • CU1-> DU1-> Cell_1 configures a scheduling strategy to migrate UEs: within 1000 transmission time intervals (Transmission Time Interval, TTI), the number of UE scheduling exceeds 100, and the number of scheduling failures exceeds 80. If such a UE exists, it moves out.
  • TTI Transmission Time Interval
  • CU1-> Cell_1 configures the UE migration strategy. If the migration reason is R, the UE is switched to the neighboring cell.
  • CU1-> DU1-> Cell_1 has neighboring cells CU1-> DUn-> Cell_M.
  • the UE migration method in this embodiment includes the following steps:
  • Step 6010 During the CU1-> DU1-> Cell_1 scheduling process, it is detected that UE0 satisfies assumption 1), then UE0 is selected as the migrated UE, and the migration reason value is R.
  • Step 6020 DU1 informs CU1 through the "DU Migration UE List Indication" message that UE0 under CU1-> DU1-> Cell_1 needs to be migrated due to the occurrence cause value being R.
  • Step 6030 CU1 receives the "DU migration UE list indication" message from DU1 and finds that the reason for migration is R, and initiates the process of switching UE0 to CU1-> DUn-> Cell_M.
  • Step 6040 UE0 receives the handover instruction and switches to CU1-> DUn-> Cell_M cell.
  • Embodiment 3 of the present application also provides a UE migration method.
  • the difference between this embodiment and the foregoing embodiments 1 and 2 is that, in this embodiment, the CU sends a low-load neighbor cell indication to assist the DU in choosing to migrate the UE.
  • the following conditions may be preset:
  • CU1-> DU1-> Cell_1 configures a high load threshold so that the PRB occupancy rate reaches 80% of the available resources of the cell.
  • CU1-> DU1-> Cell_1 configures the UE migration out selection strategy to select UEs whose PRB occupancy rate exceeds 5%.
  • the cell Cell_1 has two neighboring cells, which are:
  • UE0 supports migration to the neighbor cell Cell_M
  • UE1 does not support migration to the neighbor cell Cell_M.
  • this embodiment 4 may include the following steps:
  • step S7010 CU1 finds that the load of the two neighboring cells Cell_M and Cell_T of the cell Cell_1 is 20% and 70%, respectively. According to the set low-load judgment criterion, it is considered that the neighboring cell Cell_M is a low-load neighboring cell.
  • Step S7020 CU1 notifies DU1 of the low-load neighbor cell_M frequency and other information through the F1 interface "CU low-load neighbor cell frequency information indication" message.
  • step S7030 DU1 receives the low load frequency indication information, and after a period of time, it is found that the PRB occupancy rate of the cell Cell_1 exceeds 80%.
  • Step S7040 DU1 starts to screen the UE for migration.
  • the setting condition 2 only UE0 and UE1 satisfy the condition; according to the setting condition 5), since UE1 does not support the migration to the neighboring cell Cell_M, UE1 is excluded, and only UE0 satisfies the migration condition. Therefore, DU1 selects UE0 to send to CU1, and requests CU1 to migrate to UE0. The reason for the migration is high load.
  • step S7050 after receiving the relocation request, CU1 finds that the cause of the relocation is the high load of the cell, and the cell Cell_1 has a low-load neighbor Cell_M, then CU1 initiates a migration process to the neighbor cell Cell_M for UE0. Measurement switching, redirection, etc.
  • Step S7060 after receiving the relocation instruction, UE0 relocates to the CU1-> DUn-> Cell_M cell indicated by the relocation instruction.
  • CU1 does not actively collect the load of the neighboring cell of the cell Cell_1, but the DU first indicates the load change to the CU, and then the CU takes reasonable load balancing measures.
  • the threshold for sending the high load indication message configured by the cell Cell_1 is that the PRB occupancy rate exceeds 75%.
  • the high load threshold of the cell Cell_1 is configured so that the PRB occupancy rate reaches 80% of the available resources of the cell.
  • the cell Cell_1 configures the UE migration out selection strategy to select the UE whose PRB occupancy rate exceeds 5%.
  • UE0 supports migration to the neighbor cell Cell_M
  • UE1 does not support migration to the neighbor cell Cell_M.
  • this embodiment may include the following steps:
  • Step S8010 it is detected that the PRB occupancy rate of the cell Cell_1 exceeds 75% but does not exceed 80%, then the DU1 sends a "DU load indication" message to the CU1.
  • Cell_1 load status (medium or high), CU1-> DU1-> Cell_1 uplink and downlink remaining capacity (indicating remaining service acceptance capacity).
  • Step S8020 after receiving the load instruction, CU1 finds that the load of Cell_1 is too high, and CU1 starts the load collection process of the neighboring cell of Cell_1.
  • This embodiment describes load collection in the neighboring area.
  • the neighbor cell of the 5G RAN system cell is configured on the CU side. Therefore, the CU is responsible for load collection in the neighbor cell.
  • Neighbor cells may be deployed across DUs or across CUs (there may also be neighboring cells of different systems, such as Long Term Evolution (LTE) neighbor cells), as shown in Figures 1 and 9:
  • LTE Long Term Evolution
  • CU and LTE are connected via X2 interface.
  • the load collection is also divided into the following three types.
  • the first type load interaction between CU and LTE cell
  • This load interaction can be carried out through the existing X2 standard protocol messages, mainly involving the following three messages:
  • Resource status request (RESOURCE STATUS REQUEST): Specify the load of the resource that needs to be collected and the period of the load report.
  • the second kind load interaction between CU and DU
  • This load interaction can be modeled on the X2 load interaction mode, and three messages need to be added on the F1 interface:
  • CU RESOURCE STATUS REQUEST (the message name is only for display, not limited to this): CU sends it to DU, requesting DU to report the load of the designated cell.
  • Message content cell identification, resource type to be collected, load reporting method and period, etc.
  • CU RESOURCE STATUS RESPONSE (message name is not limited to this): DU is sent to CU, DU cell responds to CU request for resource collection.
  • DU RESOURCE STATUS UPDATE (the message name is not limited to this): DU reports the cell load according to the CU RESOURCE STATUS REQUEST request method.
  • the content of the message may include cell identification, hardware, transmission load status (high, medium, low), remaining resources (indicating service acceptance capability), etc.
  • the third kind load interaction between CU and CU
  • This load interaction can be modeled on the X2 load interaction mode, and three messages need to be added to the Xn interface:
  • XN RESOURCE STATUS REQUEST A cell of CU1 requests the load of some cells under CU2, and then CU1 sends it to CU2 through the Xn port.
  • the content of the message may include the identity of the neighboring cell that needs to collect the load, the type of load that needs to be collected (hardware load, transmission load, physical resource load, etc.), load reporting method and period, etc.
  • CU2 responds to the cell load requested by CU1 as requested by CU1.
  • the content of the message may include CU2 load, for example, hardware load or transmission load status, etc., and the cell ID under CU2 that needs to report load, hardware, transmission load status (high, medium, low), remaining resources (indicating service acceptance capability), etc.
  • the load interaction between the CU and CU may be forwarded by the CU to the DU for processing. And call the interface of CU and DU load interaction.
  • CU1-> DU1-> Cell_1 has two neighboring cells, one inter-DU neighboring cell CU1-> DUn-> Cell_M, and one cross-CU The neighboring cell CU2-> DU2-> Cell_CU2_T.
  • the load collection of this implementation includes the following steps:
  • Step S9010 CU1 receives the "DU load indication" of CU1-> DU1-> Cell_1 and finds that CU1-> DU1-> Cell_1 is highly loaded, or CU1's own strategy (such as CU1 hardware load reaching the set threshold, CU1's self Optimization function) and other reasons, start to collect the load of CU1-> DU1-> Cell_1 neighboring area.
  • Step S9020 CU1 sends a load collection request CU RESOURCE STATUS REQUEST to CU1-> DUn-> Cell_M through the F1 interface.
  • the main content of the message is: CU1-> DUn-> Cell_M cell identification, collected load type (including but not limited to transmission load , Physical resource load, hardware load, etc.), load reporting cycle.
  • Step S9030 CU1 sends a load collection request XN RESOURCE STATUS REQUEST to CU2 through the Xn interface, the main content of the message: the cell ID of CU2-> DU2-> Cell_CU2_T, the type of load collected (including but not limited to transmission load, physical resource load, hardware Load, etc.), load reporting period.
  • Step S9040 CU1-> DUn-> Cell_M receives the load collection request CURESRESCESTATUSREQUEST of CU1, and sends CURESRESCESTATUSRESPONSE to CU1 as a response, indicating that CU1-> DUn-> Cell_M has accepted the request and will report according to the request load.
  • Step S9050 CU2 receives the load collection request XN RESOURCE STATUS REQUEST of CU1 and finds that it needs to collect the load of CU2-> DU2-> Cell_CU2_T, then CU2 sends CU RESOURCE STATUS REQUEST to DU2 through the F1 interface, the main content of the message: CU2-> DU2 -> Cell_CU2_T's cell ID, collected load type (including but not limited to transmission load, physical resource load, hardware load, etc.), load reporting period.
  • CU2-> DU2 -> Cell_CU2_T's cell ID, collected load type including but not limited to transmission load, physical resource load, hardware load, etc.
  • Step S9060 CU2-> DU2-> Cell_CU2_T receives the CU2 load collection request CU RESOURCE STATUS REQUEST and sends CU RESOURCE STATUS RESPONSE to CU2 as a response, indicating that CU2-> DU2-> Cell_CU2_T has accepted the request and will report it as requested load.
  • Step S9070 After CU2 receives the resource collection response CU2-> DU2-> Cell_CU2_T CU RESOURCE STATUS RESPONSE, it responds to CU1 through the Xn interface to XN RESOURCE STATUS RESPONSE, indicating that DU2 has accepted the request and will report the load as requested.
  • Step S9080 CU1-> DUn-> Cell_M collects the load and sends DURESOURCESTATUSUPDATE to report the load to the CU1 through the F1 interface, the message content: CU1-> DUn-> Cell_M cell identification, hardware, transmission load status (high, medium, Low), remaining resources (indicating business acceptance capacity), etc.
  • Step S9090 CU2-> DU2-> Cell_CU2_T collects load, sends DURESOURCESTATUSUPDATE to report load through F1 interface, message content: CU2-> DU2-> Cell_CU2_T cell ID, hardware, transmission load status (high, medium, Low), remaining resources (indicating business acceptance capacity), etc.
  • Step S9100 CU2 sends the received CU2-> DU2-> Cell_CU2_T load to CU1 through the Xn interface message XN RESOURCE STATUS UPDATE, the message content: CU2-> DU2-> Cell_CU2_T cell ID, hardware, transmission load status (high, Medium and low), remaining resources (indicating business acceptance capacity), etc.
  • CU1 parses the received DU RESOURCE STATUS UPDATE to obtain the load across the DU neighborhood CU1-> DUn-> Cell_M, and CU1 parses the received XN RESOURCE STATUS UPDATE to obtain the cross-CU neighbor CU2-> DU2- > Load of Cell_CU2_T.
  • module and “unit” may implement a combination of software and / or hardware that performs a predetermined function.
  • the devices described in the following embodiments are implemented in software, implementation of hardware or a combination of software and hardware is also possible and conceived.
  • FIG. 10 is a structural block diagram of a centralized unit CU according to an embodiment of the present application.
  • the centralized unit 100 includes a receiving module 110 and a migration module 120.
  • the receiving module 110 is configured to receive the migrated UE list sent by the distribution unit DU.
  • the migration module 120 is configured to perform neighbor cell migration on the UE in the migrated UE list.
  • FIG. 11 is a structural block diagram of a distribution unit according to an embodiment of the present application. As shown in FIG. 11, the distribution unit 200 includes a monitoring module 210 and a sending module 220.
  • the monitoring module 210 is configured to monitor the status of the UE in the first cell, and add the UE in the first cell that conforms to the migration policy to the list of migrated UEs.
  • the sending module 220 is configured to send the migrated UE list to the centralized unit CU, so that the CU performs neighbor cell migration on the UEs in the migrated UE list.
  • the above-mentioned multiple modules can be implemented by software or hardware. For the latter, they can be implemented by the following methods, but not limited to this: the above-mentioned modules are all located in the same processor; or, the above-mentioned multiple modules are respectively combined in any combination Located in different processors.
  • the above-mentioned multiple modules or multiple steps of the present application may be implemented by a general-purpose computing device, and they may be concentrated on a single computing device or distributed on a network composed of multiple computing devices.
  • they can be implemented with program code executable by the computing device, so that they can be stored in the storage device to be executed by the computing device, and in some cases, the programs can be executed in an order different from here
  • the steps shown or described are implemented by making them into multiple integrated circuit modules, respectively, or by making multiple modules or steps among them into a single integrated circuit module. In this way, this application is not limited to any specific combination of hardware and software.

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

Abstract

L'invention concerne un procédé de migration d'équipement utilisateur (UE), une unité centralisée (CU), une unité de distribution (DU) et un système, le procédé comprenant les étapes suivantes : une CU reçoit une liste de migration d'UE envoyée par une DU ; et la CU réalise une migration de cellule adjacente pour des UE dans la liste de migration d'UE.
PCT/CN2019/118325 2018-11-15 2019-11-14 Procédé de migration d'équipement utilisateur, unité centralisée, unité de distribution et système WO2020098730A1 (fr)

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