Sidelink Unlicensed-Band SCI Mapping for Reliable PSSCH Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing data channel transmission and reception in the sidelink unlicensed band (SL-U), particularly in determining the number of coded symbols for sidelink control information (SCI) and aligning resources for optimal transmission.
Innovation Solution
A method and apparatus for determining the number of orthogonal frequency division multiplexing (OFDM) symbols available for physical sidelink shared channel (PSSCH) transmission, calculating the number of coded symbols for 2nd SCI based on available OFDM symbols, and mapping SCI to radio resources considering parameters like starting OFDM symbol location and PSFCH presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of coded symbols for SCI is determined without considering LBT success timing, then resource allocation is simplified, but transmission reliability deteriorates due to misalignment with actual available resources
Solution Approach 1:
The patent applies preliminary action by determining the number of coded symbols for SCI based on the LBT success point in time before actual transmission occurs. The transmitting UE calculates the available OFDM symbols by considering the LBT success timing, and this information is included in the SCI message itself, allowing the receiving UE to correctly interpret the resource allocation without requiring complex real-time coordination.
2Productivity
If gap symbols are excluded from resource allocation calculations, then resource utilization efficiency improves, but transmission speed decreases due to reduced available symbols
Solution Approach 1:
The patent applies local quality by making the resource allocation parameters variable depending on the specific LBT success timing and gap symbol configuration. Instead of using fixed resource allocation, the number of coded symbols for SCI is dynamically determined based on the actual available OFDM symbols after excluding gap symbols, optimizing resource utilization for each specific transmission scenario.
3Device complexity
If rate matching is performed without considering PSFCH presence, then processing complexity is reduced, but resource allocation accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by determining the number of coded symbols for SCI based on the presence or absence of PSFCH before transmission occurs. The transmitting UE calculates the available OFDM symbols by considering whether PSFCH is present in the slot, and this information is encoded in the SCI message, allowing the receiving UE to perform accurate rate matching without requiring complex real-time detection of PSFCH presence.
Data Source
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AI summary
A wireless UE that operates in a sidelink unlicensed band in a wireless communication system may include at least one antenna configured to transmit and receive one or more wireless signals, at least one processor, and a memory configured to store instructions for the wireless UE when executed by the at least one processor, and the operation of the wireless UE may include determining the number of OFDM symbols available for PSSCH transmission; determining the number of coded symbols of 2nd SCI based on the number of OFDM symbols available for PSSCH transmission; determining the number of resource elements of 2nd SCI based on the number of coded symbols of 2nd SCI; and mapping the 2nd SCI to radio resources based on a parameter related to a starting OFDM symbol location and a parameter related to the number of OFDM symbols and transmitting the same to another wireless UE.