Dynamic RE Adjustment for Uplink Control in NR-U
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Solution Overview
Problem
In the NR-U system, the dynamic changes in available time-frequency resources due to Listen Before Talk (LBT) pose challenges in ensuring reliable uplink transmission while avoiding resource waste, particularly for uplink control information.
Innovation Solution
A method where user equipment dynamically adjusts the number of Resource Elements (REs) occupied by uplink control information in each sub-band based on the number of available sub-bands, ensuring reliable transmission and preventing resource waste by correlating the number of REs with the size of the sub-bands determined by LBT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of REs for uplink control information is fixed regardless of available sub-bands, then the transmission reliability is simplified to guarantee, but resource waste occurs when LBT results in fewer available sub-bands
Solution Approach 1:
The patent applies dynamics by making the number of REs for uplink control information dynamically adjustable based on the number of available sub-bands determined by LBT. Instead of a fixed allocation, the system adapts the RE count to match actual channel conditions, thereby avoiding resource waste when fewer sub-bands are available while ensuring sufficient resources when more sub-bands are available for reliable transmission.
Solution Approach 2:
The patent changes the parameter of RE count for uplink control information based on the LBT outcome. The base station configures multiple RE count values corresponding to different numbers of available sub-bands, and the UE adjusts its transmission accordingly. This parameter adaptation resolves the contradiction by matching resource allocation to actual channel availability.
2Reliability
If the number of REs for uplink control information is increased to ensure reliable transmission, then transmission reliability improves, but resource efficiency deteriorates due to potential waste when fewer sub-bands are available
Solution Approach 1:
The system dynamically adjusts the RE count based on the actual number of available sub-bands determined by LBT. When more sub-bands are available, more REs are allocated to ensure reliable transmission; when fewer sub-bands are available, fewer REs are used to maintain resource efficiency. This dynamic adjustment resolves the contradiction between reliability and resource efficiency.
Solution Approach 2:
The patent implements parameter changes by configuring multiple RE count values that correspond to different LBT outcomes. The base station provides configuration information indicating different RE counts for different numbers of available sub-bands, allowing the system to optimize the balance between transmission reliability and resource efficiency based on actual channel conditions.
3Productivity
If the number of REs is dynamically adjusted based on available sub-bands, then resource efficiency improves, but the complexity of determining and coordinating RE counts increases
Solution Approach 1:
The base station performs preliminary action by pre-configuring multiple RE count values and their corresponding relationships with the number of available sub-bands before actual transmission. This configuration information is provided to the UE in advance, so that when LBT is performed, both the base station and UE can independently determine the appropriate RE count without complex real-time coordination, thus reducing system complexity while maintaining resource efficiency.
Solution Approach 2:
The system uses feedback mechanisms where the base station configures RE count values based on expected LBT outcomes, and the UE applies these configurations based on actual LBT results. This feedback-based configuration approach allows dynamic resource efficiency improvement while keeping the coordination complexity manageable through pre-established rules.
Data Source
AI summary
The disclosure discloses a method and device in a user equipment and a base station for wireless communication. The UE performs K channel listening in K sub-bands, respectively; determines that a first radio signal can only be transmitted in K1 sub-band(s) out the K sub-bands; and transmits the first radio signal in the K1 sub-band(s), wherein the K channel listening is used to determine the K1 sub-band(s) from the K sub-bands; the first radio signal comprises K1 first sub-signal(s) transmitted in the K1 sub-band(s), respectively; each of the K1 first sub-signal(s) carries a first bit block, the first bit block comprises a positive integer number of bits, and a number of REs occupied by any one of the K1 first sub-signal(s) in a time-frequency domain is correlated with the K1. The method not only ensures the reliability of uplink transmission but also avoids waste of resources in an NR-U system.