Sidelink Synchronization Sequence for PSBCH-Free Sensing UEs
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Solution Overview
Problem
Sensing devices with only simple radar sensing modules cannot generate or decode PSBCH, leading to synchronization failures in scenarios like home sensing and industrial applications due to the absence of channel coding/decoding and modulation/demodulation modules.
Innovation Solution
Implementing a first sidelink synchronization signal with a sequence that carries frame synchronization information, allowing sensing devices to synchronize without identifying PSBCH, and optionally including a CRC for increased transmission success and using different fields for configuring synchronization resources based on device type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple radar sensing module is configured for a sensing UE to limit costs, then device complexity is reduced, but synchronization capability is lost because the sensing UE cannot generate or decode PSBCH
Solution Approach 1:
The patent introduces a network side device as an intermediary that generates the PSBCH and transmits it to sensing UEs. This mediator enables sensing UEs with simple radar modules to achieve synchronization without requiring them to have channel coding/decoding capabilities, thus resolving the contradiction between device simplicity and synchronization capability.
Solution Approach 2:
The patent enables sensing UEs to copy the PSBCH transmission function from network side devices. By receiving and utilizing the PSBCH transmitted by network side devices, sensing UEs can achieve synchronization without independently generating or decoding the signal, thereby maintaining simplicity while achieving the synchronization function.
2Device complexity
If functional modules such as channel coding/decoding and modulation/demodulation are not configured for sensing UEs, then device complexity is reduced, but the sensing UE fails to generate PSBCH and perform channel decoding, resulting in synchronization failure
Solution Approach 1:
The network side device serves as a mediator that performs the complex channel coding and generates the PSBCH, then transmits it to sensing UEs. This eliminates the need for sensing UEs to perform these complex operations while still enabling them to complete the synchronization operation, thus resolving the contradiction between device simplicity and operational capability.
Solution Approach 2:
The patent enables sensing UEs to self-synchronize by simply receiving and utilizing the PSBCH transmitted by network side devices. The sensing UEs do not need to independently generate or decode the PSBCH, but can achieve synchronization through a simplified self-service process, thereby maintaining ease of operation without requiring complex functional modules.
3Measurement precision
If PSBCH is used for frame synchronization information transmission, then synchronization accuracy is improved, but sensing devices without channel decoding capability cannot identify and utilize the synchronization information
Solution Approach 1:
The patent makes the PSBCH transmission universal by having network side devices transmit the synchronization signal to both communication UEs and sensing UEs. The PSBCH serves multiple functions: it provides frame synchronization for communication UEs and enables sensing UEs with simple radar modules to achieve synchronization as well, thus improving adaptability while maintaining synchronization accuracy.
Solution Approach 2:
The network side device acts as an intermediary that ensures frame synchronization accuracy by generating and transmitting the PSBCH, while also making this synchronization information available to sensing UEs. This mediator approach allows sensing devices without channel decoding capability to still access and utilize the synchronization information, thus resolving the contradiction between accuracy and adaptability.
Data Source
AI summary
This application relates to a communication method and apparatus. The method includes: A first terminal device sends a first sidelink synchronization signal, where the first sidelink synchronization signal includes a first sequence, the first sequence is used for carrying frame synchronization information, and the frame synchronization information is used by another terminal device to synchronize with the first terminal device. In embodiments of this application, a sequence carries frame synchronization information, so that a sensing device can implement synchronization without identifying a physical sidelink shared channel (PSBCH).