Uplink BWP Switching for Low-Latency RA and SR Requests
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Solution Overview
Problem
The challenge in wireless communication systems is to efficiently manage uplink resources with bandwidth part (BWP) switching to address latency and delay issues, particularly in applications sensitive to performance degradation due to these factors.
Innovation Solution
A method and apparatus for performing a random access (RA) procedure by selecting a second UL BWP when an ongoing scheduling request (SR) is on a first UL BWP, configuring SR and PRACH resources on the second UL BWP, and transmitting a RA preamble and SR on this BWP, with a corresponding downlink (DL) BWP having the same identifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a scheduling request (SR) procedure is ongoing on a first uplink bandwidth part (BWP), then the SR resource is allocated on the first UL BWP, but switching to a second UL BWP for random access requires additional BWP configuration and switching overhead
Solution Approach 1:
The patent configures SR resources and PRACH resources on the second UL BWP in advance, before the random access procedure is triggered. This preliminary configuration allows the UE to quickly switch to the second BWP and transmit both the RA preamble and SR simultaneously without requiring additional switching actions during the random access procedure, thus resolving the contradiction between request efficiency and switching complexity
2Loss of time
If random access and scheduling request are transmitted separately on different BWPs, then resource allocation is straightforward, but transmission latency increases due to sequential processing
Solution Approach 1:
The patent merges the random access procedure and scheduling request procedure by configuring both PRACH resources and SR resources on the same second UL BWP. This allows the UE to transmit the RA preamble and SR simultaneously on the same BWP, reducing transmission latency while maintaining clear resource allocation through unified BWP configuration for both access types
Data Source
AI summary
The present invention relates to a method of performing a random access (RA) procedure by a user equipment (UE) in a wireless communication system. In particular, the method includes the steps of: triggering the RA procedure, wherein, when there is an ongoing scheduling request (SR) procedure on a first uplink (UL) bandwidth part (BWP), a second UL BWP is selected, wherein both an SR resource and PRACH resources are configured in the second ULBWP; and transmitting a RA preamble and a SR of the ongoing SR procedure on the second ULBWP.