Sidelink Cyclic Prefix Extension for UL-SL Timing Gaps
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Solution Overview
Problem
Existing sidelink communication protocols in wireless networks face challenges in efficiently managing cyclic prefix extension (CPE) for simultaneous uplink (UL) and sidelink (SL) transmissions, leading to interference and resource allocation inefficiencies.
Innovation Solution
Implementing a mechanism for cyclic prefix extension (CPE) in sidelink operations to optimize resource allocation and minimize interference between UL and SL transmissions, allowing for simultaneous and efficient use of wireless resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cyclic prefix extension is applied to support simultaneous UL and SL transmissions, then resource utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the cyclic prefix extension duration based on the time gap between UL and SL transmissions. The CPE duration is set to match the time gap when greater than a threshold, or zero otherwise, optimizing resource utilization while managing complexity through parameter adaptation rather than fixed complex configurations
Solution Approach 2:
The system implements dynamic CPE configuration where the extension duration is determined based on real-time transmission timing conditions. The mechanism automatically adapts the CPE parameter according to whether the time gap exceeds the threshold, enabling flexible resource management without requiring complex static configurations
2Reliability
If CPE is extended to accommodate timing gaps between UL and SL transmissions, then transmission reliability is improved, but time consumption increases
Solution Approach 1:
The patent uses parameter changes to optimize the balance between reliability and time consumption. The CPE duration is dynamically adjusted based on the time gap parameter - extending only when necessary (when time gap exceeds threshold) and setting to zero otherwise, thereby maintaining reliability without unnecessary time consumption
Solution Approach 2:
The system applies partial action by implementing CPE only when the time gap between transmissions exceeds a specific threshold. This selective application ensures sufficient protection for reliability when needed, while avoiding excessive CPE duration when the time gap is small, thus optimizing the trade-off between reliability and time consumption
3Adaptability or versatility
If dynamic CPE configuration is implemented, then adaptability is improved, but processing complexity increases
Solution Approach 1:
The patent implements adaptability through simple parameter changes rather than complex configuration processing. The CPE duration parameter is adjusted based on a single comparison (time gap vs. threshold), providing high adaptability to different transmission scenarios while keeping the processing complexity low through straightforward parameter modification
Data Source
AI summary
A wireless device receives one or more configuration parameters indicating cyclic prefix extension (CPE) starting positions for physical sidelink shared channel (PSSCH) transmissions and a plurality of priorities for the PSSCH transmissions. The CPE starting positions are configured for each priority. A plurality of CPE durations are based on the CPE starting positions. The wireless device receives a physical downlink control channel (PDCCH) indicating a starting symbol of a PSSCH transmission. The wireless device determines a first symbol based on a first CPE duration. The first symbol is before the first CPE duration from the starting symbol. The first CPE duration is based on a first CPE starting position that is pre-defined. The first symbol is after a processing time from the last symbol of the PDCCH. The wireless device transmits the PSSCH transmission and a CPE with a second CPE duration.