Abstract
A method for performing handover of a user equipment (UE) from a source base to a target base station is disclosed. The method includes providing, by the UE, a measurement report to the source base station, the measurement report including beam-related measurements of the target base station, providing, by the source base station, a Handover Request message to the target base station, the Handover Request message including the measurement report from the UE, providing, by the target base station, a Handover Request Acknowledgement message to the source base station, the Handover Request Acknowledgement message having a Handover Command, and providing, by the source base station, mobility control information to the UE based on the Handover Command from the target base station.
Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A method for performing handover of a user equipment (UE) from a source base station to a target base station, the method comprising:
providing, by the UE, a measurement report to the source base station, the measurement report including beam-related measurements of the target base station; providing, by the source base station, a Handover Request message to the target base station, the Handover Request message including the measurement report from the UE; providing, by the target base station, a Handover Request Acknowledgement message to the source base station, the Handover Request Acknowledgement message having a Handover Command; providing, by the source base station, mobility control information to the UE based on the Handover Command from the target base station.
2. The method of claim 1, wherein the measurement report is contained in an information element of the Handover Request message.
3. The method of claim 1, wherein the measurement report includes at least one of a synchronization signal (SS) block index or a channel state information-reference signal (CSI-RS) resource index (CRI).
4. The method of claim 1, wherein the target base station configures at least one preamble index and at least one physical random access channel (PRACH) resource corresponding to the measurement report, and sends resource allocation information of the at least one preamble index and the at least one PRACH resource to the source base station through the Handover Request Acknowledgement message.
5. The method of claim 1, wherein the Handover Request message further includes a data requirement report of the UE.
6. The method of claim 5, further comprising:
determining, by the target base station, whether to perform beam refinement during the handover based on the data requirement report.
7. The method of claim 6, wherein, when the target base station determines to perform beam refinement, the target base station configures a preamble index and a PRACH resource corresponding to at least one fine beam for the UE, and sends resource allocation information of the preamble index and the PRACH resource to the source base station through the Handover Request Acknowledgement message.
8. The method of claim 6, wherein, when the target base station determines not to perform beam refinement, the target base station configures a preamble index and a PRACH resource corresponding to at least one coarse beam for the UE, and sends resource allocation information of the preamble index and the PRACH resource to the source base station through the Handover Request Acknowledgement message.
9. The method of claim 1, wherein the Handover Request message is provided by the source base station to the target base station through an access and mobility management function (AMF).
10. The method of claim 7, further comprising:
selecting, by the UE, the preamble index and the PRACH resource; transmitting, by the UE, a random access preamble to the target base station in the selected PRACH resource.
11. The method of claim 10, wherein the target base detects the random access preamble from the UE in the selected PRACH resource.
12. The method of claim 10, wherein at least one of the PRACH resource or the preamble index is selected by the UE based on measurements of at least one of CSI-RS reference signal received power (CSI-RS-RSRP) or SS block reference signal received power (SSB-RSRP).
13. The method of claim 12, wherein the target base station monitors the PRACH resource using a spatial domain filter that is used for transmitting at least one of an SS block index or a CRI indicated to the UE in the Handover Command.
14. The method of claim 13,
wherein the target base station transmits a Physical Downlink Shared Channel (PDSCH) for a random access response to the UE; wherein antenna ports of a demodulation reference signal (DM-RS) for the random access response from the target base station to the UE are quasi co-located with an SS block or a CSI-RS resource selected by the UE for RACH transmission and association with at least one of the PRACH resource or the preamble index with respect to one or more large scale channel properties or spatial receive (RX) parameters.
15. The method of claim 14, wherein, when receiving the PDSCH for the random access response, the UE assumes that the DM-RS ports of the PDSCH is quasi co-located with the SS block or the CSI-RS resource selected by the UE for the RACH transmission and association with at least one of the PRACH resource or the preamble index with respect to the one or more large scale channel properties or spatial RX parameters.
16. A user equipment (UE) comprising:
one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:
provide a measurement report to a target base station through a source base station, the measurement report including beam-related measurements of the target base station based on a measurement configuration provided by the target base station;
communicate with the target base station based on the beam-related measurements, when the source base station decides to handover the UE to the target base station.
17. The UE of claim 16, wherein the measurement report includes at least one of a synchronization signal (SS) block index or a channel state information-resource index (CSI-RS) resource index (CRI).
18. The UE of claim 16, wherein the at least one processor is further configured to execute the computer-executable instructions to:
select a preamble index and a PRACH resource; transmit a random access preamble to the target base station in the selected PRACH resource.
19. The UE of claim 18, wherein at least one of the PRACH resource or the preamble index is selected by the UE based on measurements of at least one of channel state information-resource index reference signal received power (CSI-RS-RSRP) or synchronization signal (SS) block reference signal received power (SSB-RSRP).
20. The UE of claim 19, wherein the target base station monitors the PRACH resource using a spatial domain filter that is used for transmitting at least one of an SS block index or a CRI indicated to the UE in a Handover Command.
21. The UE of claim 16, wherein the at least one processor is further configured to execute the computer-executable instructions to receive a random access response from the target base station through a downlink transmission beam.
22. The UE of claim 21,
wherein the target base station transmits a Physical Downlink Shared Channel (PDSCH) for the random access response to the UE; wherein antenna ports of a demodulation reference signal (DM-RS) for the random access response from the target base station to the UE are quasi co-located with an SS block or a CSI-RS resource selected by the UE for RACH transmission and association with at least one of the PRACH resource or the preamble index with respect to one or more large scale channel properties or spatial receive (RX) parameters.
23. The UE of claim 22, wherein, when receiving the PDSCH for the random access response, the UE assumes that the DM-RS ports of the PDSCH is quasi co-located with the SS block or the CSI-RS resource selected by the UE for the RACH transmission and association with at least one of the PRACH resource or the preamble index with respect to the one or more large scale channel properties or spatial RX parameters.
Associated Portfolios
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Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.