UE Wake-up Signal Gap and Slot Offset Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in managing wake-up signals and bandwidth parts efficiently, leading to power savings and latency issues due to inadequate warm-up time for user equipment (UE) to switch between bandwidth parts before intended downlink transmissions.
Innovation Solution
The method involves configuring a minimum slot offset based on the UE's wake-up signal gap capability, allowing the UE to monitor the physical downlink control channel occasion for a downlink grant, ensuring sufficient warm-up time without excessive latency, by managing the minimum slot offset and wake-up signal gap size jointly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE is configured to monitor PDCCH occasions with short slot offsets to reduce latency, then the downlink transmission latency is reduced, but the UE may not have sufficient warm-up time to switch between bandwidth parts, leading to failure in receiving PDSCH
Solution Approach 1:
The patent makes the slot offset dynamic by configuring different minimum slot offsets for different bandwidth parts. The UE can adaptively use appropriate slot offsets based on the active bandwidth part, allowing short offsets for BWPs that don't require switching and longer offsets for BWPs that do require switching, thus resolving the contradiction between low latency and reliable PDSCH reception
Solution Approach 2:
The patent changes the parameter of slot offset based on bandwidth part configuration and UE capability. By determining the minimum WUS gap capability and configuring minimum slot offsets accordingly, the system adjusts timing parameters to ensure sufficient warm-up time while minimizing latency, achieving both reliability and efficiency
2Reliability
If the UE is given sufficient warm-up time to switch between bandwidth parts, then the PDSCH reception reliability is improved, but the downlink transmission latency increases
Solution Approach 1:
The patent applies different minimum slot offset configurations to different bandwidth parts based on their specific characteristics. Each BWP can have a customized minimum slot offset value that matches its switching requirements, ensuring that warm-up time is provided only where necessary while maintaining low latency elsewhere in the system
3Loss of time
If the UE monitors PDCCH occasions frequently to reduce latency, then the downlink transmission latency is reduced, but the UE power consumption increases
Solution Approach 1:
The patent implements periodic monitoring of PDCCH occasions based on configured slot offsets and bandwidth part configurations. The UE monitors PDCCH periodically at appropriate intervals rather than continuously, reducing power consumption while maintaining low latency by strategically positioning monitoring occasions to catch downlink grants
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a configuration of a minimum slot offset based at least in part on a determination of a minimum wake-up signal (WUS) gap capability associated with the UE, wherein the minimum WUS gap capability corresponds to a capability of the UE to support a WUS gap having a minimum gap size, wherein the minimum slot offset indicates a minimum time period between a physical downlink control channel (PDCCH) occasion and a physical downlink shared channel (PDSCH) occasion scheduled by the PDCCH; and monitor the PDCCH occasion for a downlink grant based at least in part on the configuration. Numerous other aspects are provided.