Sidelink Synchronization Reference Determination via Direct Path Detection
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Solution Overview
Problem
In relay-supporting sidelink communications, messages not received directly from the network can lead to incorrect configuration of synchronization references, causing synchronization issues and potential communication failures due to lack of direct linkage between remote nodes and the network.
Innovation Solution
A method for determining a synchronization reference in wireless communications that considers whether a message is transmitted via a direct path, allowing for appropriate synchronization signal transmission timing adjustments to prevent invalid node configuration, ensuring reliable sidelink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If messages are received via relay forwarding instead of direct path, then remote nodes can access the network, but synchronization reference determination becomes incorrect
Solution Approach 1:
The patent introduces a relay node as an intermediary between the remote UE and the network. The relay node forwards messages between the remote UE and the network, enabling network access for remote nodes while preventing direct path assumptions. The remote UE identifies messages as relayed through the intermediary's forwarding action, maintaining correct synchronization reference determination.
Solution Approach 2:
The patent changes the path identification parameter by introducing explicit indicators (such as directPathIndicator) that distinguish between direct and relayed message paths. This parameter change allows the remote UE to correctly identify whether a message came directly from the network or was forwarded by a relay, thereby maintaining accurate synchronization reference determination while enabling relay-based network access.
2Area of stationary object
If relay nodes are introduced to extend network coverage, then remote UEs can connect to the network, but message path identification becomes ambiguous
Solution Approach 1:
The relay node acts as an intermediary that preserves and forwards path information. When the relay node forwards messages from the network to the remote UE, it maintains indicators that reveal the original source and path of the message, preventing loss of path information despite the extended communication path through the intermediary.
Solution Approach 2:
The patent introduces explicit path identification parameters (such as directPathIndicator) that are maintained throughout the relay forwarding process. These parameters change state to indicate whether a message traveled via direct or relayed path, preserving critical path information even as the message traverses through the relay node to extend network coverage.
Data Source
AI summary
The present application discloses a method and a device for wireless communications, including: receiving a first signal, the first signal comprising a first message; and determining a synchronization reference according to at least whether the first message is transmitted via a direct path; the first message indicating a first sidelink frequency list, the first sidelink frequency list comprising a first frequency, which is used for sidelink communication; and receiving a first synchronization signal from the synchronization reference determined; and transmitting a second synchronization signal; a reception timing for the first synchronization signal being used to determine a transmission timing of the second synchronization signal. By receiving the first message and first synchronization signal, the present application can determine the synchronization reference correctly.