Uplink Signal Transmission in Unlicensed Bands via Interlace Puncturing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving uplink signals in unlicensed bands, particularly in terms of resource allocation and channel access procedures, which affect the reliability and latency of communications.
Innovation Solution
The method involves configuring subcarrier spacing through higher-layer signaling and using a channel access procedure (CAP) to puncture symbols in uplink signals, allowing for flexible interlace resource allocation and transmission across multiple symbols, enabling efficient use of interlace resources in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel access procedure (CAP) is performed in unlicensed band, then channel access reliability is improved, but transmission latency increases due to symbol puncturing
Solution Approach 1:
The base station performs channel access procedure (CAP) and determines punctured symbols in advance before uplink signal transmission. By preliminarily identifying which symbols will be punctured due to LBT failure, the UE can prepare appropriate retransmission resources and timing, reducing the overall latency impact while maintaining channel access reliability.
Solution Approach 2:
The system dynamically adjusts resource allocation based on CAP results. When symbols are punctured due to LBT, the base station dynamically assigns alternative resources for retransmission, allowing the system to adapt to changing channel conditions and minimize latency while ensuring reliable channel access.
2Adaptability or versatility
If interlace resource allocation is made flexible to accommodate CAP, then adaptability is improved, but system complexity increases
Solution Approach 1:
Uplink resources are divided into multiple interlaces, where each interlace consists of alternating resource blocks. This segmentation allows the system to flexibly allocate resources by selecting specific interlaces for transmission, enabling adaptability to CAP puncturing patterns without requiring complete reconfiguration of the resource grid, thus managing complexity.
Solution Approach 2:
The system changes resource allocation parameters dynamically based on CAP outcomes. By adjusting which interlaces are activated and how resources are mapped within those interlaces, the system achieves flexibility in accommodating punctured symbols while maintaining a relatively simple underlying resource structure that limits complexity growth.
Data Source
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AI summary
Disclosed are a method for transmitting and receiving an uplink signal between a terminal and a base station in a wireless communication system for supporting an unlicensed band, and an apparatus for supporting same. More particularly, the present invention includes a structure of interlace(s) scheduled for transmitting and receiving an uplink signal in an unlicensed band, and one embodiment in which the uplink signal is transmitted and received in the unlicensed band on the basis of same.