Unlicensed BWP Resource Allocation with Prioritized CORESETs
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Solution Overview
Problem
5G NR base stations face challenges in transmitting downlink control information (DCI) to user devices due to the listen-before-talk (LBT) procedure, which can prevent the use of available channels, leading to wasted transmission opportunities and failure in scheduling downlink or uplink transmissions.
Innovation Solution
Configuring user devices with multiple non-overlapping or overlapping CORESETs and performing LBT procedures on multiple frequency sub-bands within a bandwidth part (BWP) to identify idle channels for DCI transmission, using wake-up signals (WUS) to notify devices and assigning priorities to CORESETs for blind decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station performs LBT procedure on the entire BWP, then the channel access is safe, but the transmission opportunity is wasted when only part of the BWP is actually occupied
Solution Approach 1:
The patent divides the BWP into multiple frequency sub-bands and performs LBT procedure on each sub-band independently. This segmentation allows the base station to identify specific occupied sub-bands and avoid transmitting in those areas while still having opportunities to transmit in idle sub-bands, thus resolving the contradiction between safe channel access and transmission opportunity utilization.
2Ease of operation
If the base station transmits DCI on a specific frequency sub-band, then the transmission is targeted, but the user device may fail to receive it due to LBT blocking
Solution Approach 1:
The patent segments the BWP into multiple frequency sub-bands with associated CORESETs, allowing the base station to attempt DCI transmission on multiple sub-bands independently. This increases the probability that at least one transmission succeeds while maintaining targeted delivery to the user device.
Solution Approach 2:
The patent introduces priority levels for different CORESETs associated with different frequency sub-bands. The base station can prioritize certain sub-bands for DCI transmission based on channel conditions and LBT results, dynamically adjusting transmission parameters to improve reliability while maintaining targeting effectiveness.
3Reliability
If multiple CORESETs are configured for the user device, then the blind decoding complexity increases, but the DCI reception reliability improves
Solution Approach 1:
The patent assigns different priorities to different CORESETs based on their associated frequency sub-bands and channel conditions. The user device can focus blind decoding efforts on high-priority CORESETs first, reducing the effective search space and complexity while maintaining high reception reliability through prioritized decoding of the most likely successful transmissions.
Data Source
AI summary
A user equipment (UE) obtains resources in an unlicensed spectrum. To this end, the UE obtains a configuration that specifies a plurality of time-frequency resources and respective priorities, each of the time-frequency resources including a respective frequency sub-band within a bandwidth part allocated in an unlicensed spectrum; performs blind decoding in the bandwidth part in accordance with the configuration to detect downlink control information (DCI); and communites with a base station in accordance with the detected DCI.