CN-122002371-A - Source base station and transmission method

Abstract

A source base station and a transmission method. A source base station transmits a radio resource control reconfiguration message to a user equipment. The radio resource control reconfiguration message includes an indication message and a list of candidate base stations, and the list of candidate base stations is used for indicating a plurality of candidate base stations. The source base station determines a non-target base station of the plurality of candidate base stations based on a prediction report received from the user equipment. The source base station transmits a handover cancel request to the non-target base station of the plurality of candidate base stations to cause the non-target base station to release a reserved resource corresponding to the user equipment. The transmission technology provided by the invention can improve the resource utilization efficiency of the mobile communication system.

Inventors

• XU XIANCONG
• SHAO YUAN
• ZHANG WENYAO

Assignees

• 财团法人资讯工业策进会

Dates

Publication Date

20260508

Application Date

20241121

Priority Date

20241106

Claims (20)

1. 1. A source base station, comprising: a transceiver interface communicatively coupled to a user equipment and a plurality of candidate base stations, and A processor, electrically connected to the transceiver interface, for performing the following operations: transmitting a radio resource control reconfiguration message to the ue, wherein the radio resource control reconfiguration message includes an indication message and a list of candidate base stations, and the list of candidate base stations is used for indicating the plurality of candidate base stations; determining a non-target base station of the plurality of candidate base stations based on a prediction report received from the user equipment, wherein the prediction report is generated based on the indication message, and Transmitting a handover cancel request to the non-target base station of the plurality of candidate base stations, so that the non-target base station releases a reserved resource corresponding to the user equipment.
2. 2. The source base station of claim 1 wherein the indication message comprises a decision indication and determining the non-target base station further comprises: judging whether the indication message corresponds to a user equipment decision indication or not, and And determining the non-target base station of the plurality of candidate base stations based on a first predicted base station indicated in the prediction report in response to the indication message corresponding to the user equipment decision indication.
3. 3. The source base station of claim 2 wherein the prediction report includes a predicted signal change and the first predicted base station for each of the plurality of candidate base stations, and determining the non-target base station further comprises: Generating a predicted confidence value corresponding to the first predicted base station based on the predicted signal change for each of the plurality of candidate base stations in response to the indication message corresponding to the user equipment decision indication, and And determining that the first predicted base station is the non-target base station in response to the predicted confidence value being less than a threshold value.
4. 4. The source base station of claim 2 wherein the prediction report includes a predicted signal change and the first predicted base station for each of the plurality of candidate base stations, and determining the non-target base station further comprises: receiving a base station status information from each of the plurality of candidate base stations; Generating a predicted confidence value corresponding to the first predicted base station based on the predicted signal changes corresponding to each of the plurality of candidate base stations and the base station status information for each of the plurality of candidate base stations, and And determining that the first predicted base station is the non-target base station in response to the predicted confidence value being less than a threshold value.
5. 5. The source base station of claim 1 wherein the prediction report includes a predicted signal change for each of the plurality of candidate base stations, and determining the non-target base station further comprises: Selecting a second predicted base station from the plurality of candidate base stations based on the predicted signal changes corresponding to each of the plurality of candidate base stations, and And taking the second predicted base station as the non-target base station.
6. 6. The source base station of claim 5 wherein the processor further performs the following operations: receiving a base station status information from each of the plurality of candidate base stations; Selecting the second predicted base station from the plurality of candidate base stations based on the predicted signal changes corresponding to each of the plurality of candidate base stations and the base station status information for each of the plurality of candidate base stations, and And taking the second predicted base station as the non-target base station.
7. 7. The source base station of claim 6 wherein the base station status information comprises a load status and a current location.
8. 8. The source base station of claim 1, wherein the prediction report is generated by the user equipment by: Measuring a trace message of the user equipment, and The prediction report is generated based on a historical signal sequence value for each of the plurality of candidate base stations and the trajectory message for the user equipment.
9. 9. The source base station of claim 8 wherein the trajectory message comprises a spatial location, a direction of movement, and a speed of movement of the user device.
10. 10. The source base station of claim 1, wherein the processor further performs the following operations: receiving a handover success message from a target base station, and In response to receiving the handover success message from the target base station, a state transfer message is transmitted to the target base station, wherein the state transfer message includes a sequence number.
11. 11. The source base station of claim 1 wherein the plurality of candidate base stations in the list of candidate base stations are generated by the source base station performing a conditional handoff decision operation, and the processor further performs the operations of: Receiving a handover request acknowledge message from each of the plurality of candidate base stations, and The radio resource control reconfiguration message is generated based on the plurality of handover request confirm messages.
12. 12. The source base station of claim 1 wherein the indication message comprises a decision indication, a prediction parameter indication, and an output type indication.
13. 13. A transmission method adapted for use with a source base station, wherein the source base station is communicatively coupled to a user equipment and a plurality of candidate base stations, the transmission method comprising the steps of: transmitting a radio resource control reconfiguration message to the ue, wherein the radio resource control reconfiguration message includes an indication message and a list of candidate base stations, and the list of candidate base stations is used for indicating the plurality of candidate base stations; determining a non-target base station of the plurality of candidate base stations based on a prediction report received from the user equipment, wherein the prediction report is generated based on the indication message, and Transmitting a handover cancel request to the non-target base station of the plurality of candidate base stations, so that the non-target base station releases a reserved resource corresponding to the user equipment.
14. 14. The transmission method of claim 13, wherein the indication message includes a decision indication, and deciding the non-target base station further comprises the steps of: judging whether the indication message corresponds to a user equipment decision indication or not, and And determining the non-target base station of the plurality of candidate base stations based on a first predicted base station indicated in the prediction report in response to the indication message corresponding to the user equipment decision indication.
15. 15. The transmission method of claim 14 wherein the prediction report includes a predicted signal change and the first predicted base station for each of the plurality of candidate base stations, and determining the non-target base station further comprises the steps of: Generating a predicted confidence value corresponding to the first predicted base station based on the predicted signal change for each of the plurality of candidate base stations in response to the indication message corresponding to the user equipment decision indication, and And determining that the first predicted base station is the non-target base station in response to the predicted confidence value being less than a threshold value.
16. 16. The transmission method of claim 14 wherein the prediction report includes a predicted signal change and the first predicted base station for each of the plurality of candidate base stations, and determining the non-target base station further comprises the steps of: receiving a base station status information from each of the plurality of candidate base stations; Generating a predicted confidence value corresponding to the first predicted base station based on the predicted signal changes corresponding to each of the plurality of candidate base stations and the base station status information for each of the plurality of candidate base stations, and And determining that the first predicted base station is the non-target base station in response to the predicted confidence value being less than a threshold value.
17. 17. The transmission method of claim 13 wherein the prediction report includes a predicted signal change for each of the plurality of candidate base stations, and determining the non-target base station further comprises the steps of: Selecting a second predicted base station from the plurality of candidate base stations based on the predicted signal changes corresponding to each of the plurality of candidate base stations, and And taking the second predicted base station as the non-target base station.
18. 18. The transmission method according to claim 17, wherein the transmission method further comprises the steps of: receiving a base station status information from each of the plurality of candidate base stations; Selecting the second predicted base station from the plurality of candidate base stations based on the predicted signal changes corresponding to each of the plurality of candidate base stations and the base station status information for each of the plurality of candidate base stations, and And taking the second predicted base station as the non-target base station.
19. 19. The transmission method of claim 13, wherein the predictive report is generated by the user equipment performing the steps of: Measuring a trace message of the user equipment, and The prediction report is generated based on a historical signal sequence value for each of the plurality of candidate base stations and the trajectory message for the user equipment.
20. 20. The transmission method of claim 19, wherein the trajectory message includes a spatial location, a direction of movement, and a speed of movement of the user device.

Description

Source base station and transmission method Technical Field The present disclosure relates to a source base station and a transmission method. More particularly, the present disclosure relates to a source base station and a transmission method capable of improving the utilization efficiency of mobile communication network resources. Background In existing legacy Handover (HO) operations, the Handover is triggered when the signal strength reaches a threshold, still depending on the measurement report of the user equipment and the decision of the source base station (source gNB). However, this method is very stringent in threshold setting, and a slight error is liable to cause a handover to be made too early or too late, and is liable to cause a handover failure and interrupt service. In the prior art, conditional handover (Conditional Handover; CHO) operations have been proposed, whereby a measurement report of a user equipment is evaluated by a source base station, reservation resources are requested to potential handover candidate base stations in advance, and handover conditions of the user equipment are informed of the respective candidate base stations. The user equipment can perform the handover by itself under the condition that any candidate base station satisfies the handover condition. The conditional handover operation can effectively reduce the probability of handover failure and improve the handover smoothness of the ue. However, according to the current conditional handover specifications, the source base station may require resources reserved by a plurality of candidate base stations in advance, so as to ensure continuous connection and quality of service of the ue while moving. In this case, the reserved resources need to be kept in an occupied state before the ue actually switches, and the ue can select to perform the handover operation when it measures that the candidate base station satisfies the handover condition. In other words, all potential candidate base stations reserve resources for handover of the ue, and only after the ue is successfully handed over, the source base station is notified of the release of resources. In the trend of 5G/6G network densification (Network Densification), frequent handover of ue will be caused, and the current conditional handover operation will affect the overall system performance, such as the connection capability (connection capacity), for the specification of the release of reserved resources of the candidate base station. In view of the foregoing, it is an urgent need to provide a source base station and a transmission method that can improve the utilization efficiency of mobile communication network resources. Disclosure of Invention An object of the present invention is to provide a source base station. The source base station includes a transceiver interface and a processor. The transceiver interface is configured to be communicatively coupled to a user equipment and a plurality of candidate base stations. The processor is electrically connected to the transceiver interface. The processor transmits a radio resource control reconfiguration message to the ue, wherein the radio resource control reconfiguration message includes an indication message and a list of candidate base stations, and the list of candidate base stations is used to indicate the plurality of candidate base stations. The processor determines a non-target base station of the plurality of candidate base stations based on a prediction report received from the user equipment, wherein the prediction report is generated based on the indication message. The processor transmits a handover cancel request to the non-target base station of the plurality of candidate base stations to cause the non-target base station to release reserved resources corresponding to the user equipment. In one embodiment of the present invention, wherein the indication message includes a decision indication and determining the non-target base station further includes determining whether the indication message corresponds to a user equipment decision indication, and determining the non-target base station of the plurality of candidate base stations based on a first predicted base station indicated in the prediction report in response to the indication message corresponding to the user equipment decision indication. In one embodiment of the present invention, wherein the prediction report includes a predicted signal change and the first predicted base station corresponding to each of the plurality of candidate base stations, and determining the non-target base station further includes generating a predicted confidence value corresponding to the first predicted base station based on the predicted signal change of each of the plurality of candidate base stations in response to the indication message corresponding to the user equipment decision indication, and determining the first predicted base station to be the