Sidelink SCI Mapping With DMRS Overlap for Lower Terminal Power
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Solution Overview
Problem
The power consumption of pedestrian terminals (P-terminals) in sidelink communication systems is high due to the mapping of second-stage SCI from the symbol subsequent to the end symbol of first-stage SCI, which increases battery drain.
Innovation Solution
The proposed method involves configuring sidelink subchannels with a size equal to or greater than a threshold value, multiplexing PSCCH and PSSCH DMRS in the frequency domain, and mapping second-stage SCI to the symbol where the first PSSCH DMRS is located, or mapping first-stage SCI to one or more symbols and second-stage SCI to a preceding symbol in the time domain, to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If second-stage SCI is mapped from the symbol subsequent to the end symbol of first-stage SCI, then complete SCI transmission is achieved, but power consumption of receiving terminals increases
Solution Approach 1:
The patent applies dimensionality change by mapping second-stage SCI to the time domain resource (symbol) overlapping with the first PSSCH DMRS symbol, rather than placing it sequentially in time. This spatial-temporal rearrangement allows the receiving terminal to receive both SCI stages within a shorter time window, reducing the active reception duration and thus lowering power consumption while maintaining complete SCI transmission.
Solution Approach 2:
The patent implements preliminary action by having the receiving terminal perform blind detection for first-stage SCI in advance, before the second-stage SCI is fully transmitted. The terminal uses the blind detection result to determine whether to continue receiving second-stage SCI, thereby avoiding unnecessary power consumption when the first-stage SCI indicates no second-stage SCI is needed.
2Measurement precision
If receiving terminal performs blind detection for first-stage SCI, then correct SCI reception is ensured, but power consumption increases due to multiple detection operations
Solution Approach 1:
The patent applies feedback by using the blind detection result of first-stage SCI as feedback information to determine whether to proceed with receiving second-stage SCI. The receiving terminal feeds back the blind detection outcome to control its subsequent reception behavior, thereby avoiding unnecessary power consumption when second-stage SCI is not required, while ensuring accurate SCI reception when needed.
Solution Approach 2:
The patent implements partial action by performing blind detection only for the necessary first-stage SCI reception rather than attempting to receive all possible SCI stages unconditionally. The terminal uses partial blind detection to determine the actual reception requirements, avoiding excessive power consumption while maintaining sufficient accuracy for proper SCI decoding.
3Productivity
If PSCCH and PSSCH DMRS are multiplexed in frequency domain, then resource utilization is improved, but mapping complexity increases
Solution Approach 1:
The patent applies universality by designing a mapping method that can handle multiple scenarios (different SL subchannel sizes, PSCCH sizes, and mapping types) through a unified approach. The system uses universal mapping rules that work across different configurations, reducing the need for separate complex handling of each case while maintaining efficient resource utilization through frequency-domain multiplexing.
Data Source
AI summary
A method and an apparatus for transmitting SCI in sidelink communication may include the steps of: receiving, from a base station, configuration information of the size of an SL subchannel set to a threshold value or higher for power saving of a receiving terminal; multiplexing a PSCCH and a first PSSCH DMRS in a frequency domain when the size of the SL subchannel is equal to or greater than the threshold value; and mapping second stage SCI to a symbol in which the first PSSCH DMRS is located.