Sidelink Uplink Slot Synchronization via PSBCH State Indexing
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Solution Overview
Problem
Existing wireless communication systems face challenges in synchronizing uplink slot numbers for sidelink communication, particularly in scenarios like vehicular networks, which require high efficiency and reliability, due to direct UE-to-UE communication without relay by wireless access network nodes.
Innovation Solution
A method involving user equipment (UE) determining and transmitting uplink slot numbers through a physical sidelink broadcast channel (PSBCH) message, using Z bits to specify the number of uplink slots, and a second UE determining these slots based on state indices and other parameters to ensure synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct UE-to-UE sidelink communication is used without relay by wireless access network nodes, then communication efficiency and speed are improved, but synchronization of uplink slot numbers becomes difficult to maintain
Solution Approach 1:
The first UE autonomously determines the number of uplink slots and encodes this information in PSBCH messages without requiring network node intervention. This self-service mechanism enables direct UE-to-UE synchronization, maintaining communication efficiency while solving the synchronization problem through peer-to-peer information exchange.
Solution Approach 2:
PSBCH messages serve as an intermediary carrier to transmit uplink slot number information between UEs. The Z bits in PSBCH act as a structured medium that enables reliable synchronization by formally encoding and transmitting slot configuration data, transforming the synchronization challenge into a controlled information exchange process.
2Measurement precision
If Z bits are used in PSBCH to indicate state index for uplink slot synchronization, then synchronization precision is improved, but message complexity increases
Solution Approach 1:
The uplink slot configuration information is segmented into Z discrete bits within the PSBCH message, where each bit position represents a specific parameter. This segmentation allows precise indication of uplink slot numbers while maintaining a structured, parseable format that balances precision with processing efficiency.
Solution Approach 2:
The state index encoded in Z bits represents different uplink slot configurations. By changing the value of Z and the corresponding state index, the system can precisely indicate different slot numbers and patterns. This parameter-based approach enables flexible synchronization precision while keeping the message structure manageable through standardized encoding.
Data Source
AI summary
The present disclosure describes methods, system, and devices for synchronizing at least one number of uplink slots for a user equipment (UE) for a sidelink communication. The method includes determining, by a first UE, at least one number of uplink slots for the sidelink communication between the first UE and a second UE; and transmitting, by the first UE to the second UE, a physical sidelink broadcast channel (PSBCH) message comprising Z bits indicating a state index, Z being a positive integer. The Z bits in the PSBCH message are configured to specify to the second UE the at least one number of uplink slots for the sidelink communication.