Candidate Uplink Grants for Wireless Channel Access
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Solution Overview
Problem
In wireless communications, user equipment (UE) in shared radio frequency spectrum bands face delays and increased signaling overhead due to the need to perform additional listen before talk (LBT) procedures when resource blocks indicated in uplink grants are unavailable, even if other available resource block sets exist.
Innovation Solution
The UE receives control signaling indicating multiple candidate uplink grants, each associated with one or more resource block sets, and selects a grant based on availability, using an order rule to determine the best resource block sets for uplink transmission, thereby reducing the need for unnecessary LBT procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs additional LBT procedures when resource blocks indicated in uplink grants are unavailable, then channel access reliability is improved, but latency increases and signaling overhead increases
Solution Approach 1:
The base station provides multiple candidate uplink grants in advance, each associated with different resource block sets. The UE performs LBT procedures on these candidate grants beforehand and selects an available one, avoiding the need to wait for additional grants when the initial grant is unavailable, thus reducing latency while maintaining reliability
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station provides candidate uplink grant configurations that act as intermediaries between the initial grant and the actual transmission. These candidate grants contain pre-configured resource block sets that the UE can evaluate and select from, reducing the need for additional LBT procedures and signaling
2Reliability
If the UE performs additional LBT procedures when resource blocks indicated in uplink grants are unavailable, then channel access reliability is improved, but signaling overhead increases
Solution Approach 1:
The base station provides multiple candidate uplink grants in advance with pre-configured resource block sets. The UE evaluates these candidates and selects an available one, eliminating the need for additional signaling requests when the initial grant is unavailable, thus reducing signaling overhead while maintaining reliability
Solution Approach 2:
The candidate uplink grant configurations serve as intermediaries that contain pre-negotiated resource block sets. The UE can directly select from these candidates without requiring additional uplink grants or signaling exchanges with the base station, reducing the signaling overhead associated with requesting and receiving additional grants
3Device complexity
If the UE uses a single uplink grant with fixed resource blocks, then device complexity is reduced, but resource utilization decreases
Solution Approach 1:
The patent segments the uplink grant into multiple candidate grants, each associated with different resource block sets. The UE selects from these segmented options based on availability, improving resource utilization without significantly increasing device complexity since the selection process follows simple evaluation rules
Solution Approach 2:
The patent introduces dynamics by allowing the UE to select different resource block sets from candidate grants based on real-time availability. This dynamic selection capability improves resource utilization while maintaining relatively simple device complexity through straightforward evaluation and selection mechanisms
4Productivity
If the UE selects from multiple candidate uplink grants, then resource utilization improves, but device complexity increases
Solution Approach 1:
The uplink grant is segmented into multiple candidate grants with different resource block sets. The UE evaluates these segmented options and selects the most suitable one, improving resource utilization while keeping device complexity manageable through structured evaluation procedures
Solution Approach 2:
The UE autonomously evaluates the candidate uplink grants and selects an available one without requiring additional signaling or intervention from the base station. This self-service capability improves resource utilization while minimizing the increase in device complexity by using straightforward evaluation and selection logic
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit control signaling including a candidate uplink grant configuration to a user equipment (UE). The candidate uplink grant configuration may include an indication of multiple candidate uplink grants for an uplink grant, each candidate uplink grant indicating one or more resource block sets configured for a channel access procedure. The UE may select a candidate uplink grant for transmitting the uplink transmission based on an availability of one or more resource block sets of the selected candidate uplink grant. For example, the UE may perform a channel access procedure for the resource block sets indicated by the candidate uplink grants to determine the availability of each candidate uplink grant. The UE may transmit an uplink transmission to the base station using the one or more resource block sets indicated by the selected candidate uplink grant.