RACH-less Handover via Pre-allocated UL Grant and TCI List
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in efficiently managing uplink grants and beam selection for user equipment (UE) during handovers and secondary node additions, particularly in asynchronous networks.
Innovation Solution
The proposed method involves a UE receiving a pre-allocated uplink (UL) grant from a first base station (BS), which includes a secondary node (SN) transmission configuration indicator (TCI) list and a type 1 configured grant (CG). The UE then transmits an initial physical uplink shared channel (PUSCH) transmission to a second BS based on a selected TCI from the list, facilitating seamless handovers and secondary node additions without the need for a random access channel (RACH) procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a RACH procedure is used for handover and secondary node addition, then the protocol ensures reliable connection establishment, but it consumes network resources, time, and processing power
Solution Approach 1:
The target base station performs preliminary actions by pre-configuring the UE with a pre-allocated uplink grant containing TCI list and type 1 configured grant information before the actual handover occurs. This preliminary preparation eliminates the need for RACH procedure during handover, reducing handover time while maintaining connection reliability through pre-established transmission parameters.
2Reliability
If a RACH procedure is used for handover and secondary node addition, then the protocol ensures reliable connection establishment, but it consumes network resources and processing power
Solution Approach 1:
The target base station performs preliminary actions by pre-configuring the UE with a pre-allocated uplink grant containing TCI list and type 1 configured grant information before the actual handover occurs. This preliminary preparation eliminates the need for RACH procedure during handover, reducing handover time while maintaining connection reliability through pre-established transmission parameters.
3Reliability
If a RACH procedure is used for handover and secondary node addition, then the protocol ensures reliable connection establishment, but it increases processing complexity
Solution Approach 1:
The target base station performs preliminary actions by pre-configuring the UE with a pre-allocated uplink grant containing TCI list and type 1 configured grant information before the actual handover occurs. This preliminary preparation eliminates the need for RACH procedure during handover, reducing handover time while maintaining connection reliability through pre-established transmission parameters.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may determine to transmit a pre-allocated uplink (UL) grant to a user equipment (UE), wherein the pre-allocated UL grant includes: a secondary node (SN) transmission configuration indicator (TCI) list, and a type 1 configured grant (CG). The base station may transmit, to the UE, the pre-allocated UL grant based at least in part on determining to transmit the pre-allocated UL grant. Numerous other aspects are provided.