Sidelink Synchronization Resource Allocation for NR-V2X

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Solution Overview

Problem

In NR-V2X communication systems, multiple terminals sending synchronization signals on shared sidelink resources lead to reliability and performance issues due to limited synchronization slot resources, causing degradation in synchronization performance and data transmission.

Innovation Solution

Configuring synchronization resources with additional redundant synchronization slots, allowing terminal devices to occupy part or all of the slots based on channel access results, enabling multiple terminals to send synchronization signals effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple terminals send synchronization signals on shared synchronization resources, then the coverage and robustness of synchronization signal transmission is improved, but the reliability of synchronization signal transmission deteriorates due to channel conflicts and interference

Engineering Contradiction:

Improvecoverage and robustness of synchronization signal transmissionVSAvoidreliability of synchronization signal transmission

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The synchronization resource is divided into multiple synchronization slots (N slots) within a single synchronization resource block. Terminals can select different slots to transmit synchronization signals, segmenting the transmission opportunity in time domain. This reduces collision probability while maintaining multiple transmission opportunities, thus improving reliability without sacrificing coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic channel access mechanisms where terminals perform channel sensing and select synchronization slots based on current channel conditions. The terminal device determines channel occupancy and selects available slots dynamically, adapting to changing interference conditions. This dynamic approach maintains high reliability by avoiding occupied slots while preserving coverage through multiple available options.

Inventive Principle:

Principle #15Dynamics

2Reliability

If terminals perform channel access procedures before transmitting synchronization signals, then the reliability of transmission is improved, but the time delay and complexity of the synchronization process increases

Engineering Contradiction:

Improvereliability of synchronization signal transmissionVSAvoidtime delay in synchronization process

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Terminals perform channel sensing and determine channel occupancy in advance before selecting synchronization slots. The channel access procedure is completed prior to synchronization signal transmission, ensuring that the selected slots are free from interference. This preliminary action guarantees reliable transmission without requiring time-consuming retransmissions or adjustments during the synchronization process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of requiring channel access procedures for every single synchronization slot, the patent allows terminals to perform channel sensing once and then select multiple available slots from the N synchronized slots. This partial action approach reduces the frequency of channel access procedures while still ensuring reliable transmission by selecting from pre-identified available slots, thus reducing time delay.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If the number of synchronization slots is increased to support multiple terminals, then the capacity of the system is improved, but the complexity of resource management increases

Engineering Contradiction:

Improvecapacity of synchronization resourceVSAvoidcomplexity of synchronization resource management

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent enables autonomous terminal devices to independently perform channel sensing, determine channel occupancy, and select appropriate synchronization slots without centralized coordination. Each terminal self-manages its synchronization signal transmission by autonomously identifying available slots from the N synchronized slots. This self-service mechanism increases system capacity to support multiple terminals while avoiding the complexity of centralized resource management and coordination protocols.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20240267859A1Wireless communication method, terminal device, and network device

Publication Date: 2024.08.08 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

There is provided a wireless communication, a terminal device and a network device. A terminal device determines a synchronization resource of a sidelink, where the synchronization resource includes N synchronization slots, and N is a positive integer. The terminal device sends, according to a result of performing channel access on the synchronization resource, a synchronization signal by occupying at least part of synchronization slots among the N synchronization slots.