Sidelink PRS Scheduling Using Two-Stage SCI Signaling
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G and 6G, face challenges in efficiently scheduling and transmitting sidelink positioning reference signals (SL PRS) for precise device location and connectivity, especially in scenarios involving high mobility and diverse network architectures.
Innovation Solution
The method involves transmitting first and second sidelink control information (SCI) through physical sidelink control and shared channels to schedule sidelink positioning reference signals (SL PRS), including details on the number of symbols, comb size, starting symbol, and comb offset, facilitated by devices with transceivers, processors, and memory systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sidelink positioning reference signals are transmitted using existing scheduling methods, then basic connectivity is maintained, but positioning accuracy and resource allocation efficiency deteriorate
Solution Approach 1:
The control information is segmented into two stages: first SCI on PSCCH provides basic scheduling information, and second SCI on PSSCH provides detailed SL PRS parameters. This segmentation allows precise positioning information to be transmitted efficiently without blocking other data transmissions, thereby improving both positioning accuracy and resource allocation efficiency.
Solution Approach 2:
The patent introduces a new dimension for control information transmission by using the PSSCH ( originally designed for data transmission) to carry the second SCI. This dimensional change allows positioning-specific parameters to be transmitted alongside data, improving resource utilization while maintaining positioning accuracy.
2Measurement precision
If detailed SL PRS parameters are transmitted in first SCI, then positioning control precision is improved, but channel capacity for data transmission is reduced
Solution Approach 1:
By dividing control information into two stages transmitted on different channels, the patent ensures that detailed positioning parameters do not consume PSCCH capacity, preserving data transmission capacity while maintaining precise positioning control through the second SCI on PSSCH.
Solution Approach 2:
The PSSCH is given multi-functionality by carrying both data traffic and the second SCI for SL PRS scheduling. This universal usage maximizes channel capacity utilization, allowing the same physical resource to serve multiple purposes without reducing overall system throughput.
3Reliability
If SL PRS scheduling information is transmitted through dedicated control channels, then positioning reliability is improved, but system complexity increases
Solution Approach 1:
The patent uses existing physical channels (PSCCH and PSSCH) for dual purposes: PSCCH for initial scheduling and PSSCH for both data transmission and carrying detailed SL PRS parameters. This approach achieves reliable positioning without introducing dedicated new channels, thereby avoiding increased system complexity.
Solution Approach 2:
The PSSCH serves itself by simultaneously carrying data payloads and control information for SL PRS. This self-service mechanism eliminates the need for separate dedicated control channels, maintaining system simplicity while ensuring reliable positioning through comprehensive parameter transmission.
Data Source
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AI summary
Provided are a method by which a first device performs wireless communication, and a device for supporting same. The method may comprise the steps of: transmitting, through a physical sidelink control channel (PSCCH), second sidelink control information (SCI) and first SCI for scheduling physical sidelink shared channel (PSSCH); and transmitting the second SCI through the PSSCH.