Sidelink Beam Pairing via PSCCH and PSFCH for Delay Reduction
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Solution Overview
Problem
In high-frequency band sidelink communication, the need for beam pairing between transmitting and receiving user equipment introduces inefficiencies due to delays in data transmission and reception, especially when synchronization has already been established from another source.
Innovation Solution
A method and apparatus for beam pairing in sidelink communication involving the transmission of a physical sidelink control channel with beam identification information and feedback channel resource information, followed by beam pairing based on received feedback, enabling efficient data transmission without prior beam pairing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam pairing is performed before data transmission in sidelink communication, then reliable data transmission is ensured, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by performing beam pairing in advance during the synchronization signal transmission phase. The transmitting UE transmits synchronization signals using different beams, and the receiving UE measures these signals to determine the best beam pair before actual data transmission begins. This preliminary beam pairing ensures that when data transmission starts, the optimal beam configuration is already established, thus ensuring reliability while minimizing transmission delay.
Solution Approach 2:
The patent implements dynamics by making the beam pairing process adaptive and configurable. The system allows dynamic adjustment of beam pairing parameters such as the number of beams to sweep, periodicity of beam sweeping, and resource allocation for synchronization signals. This dynamic configuration enables the system to optimize between reliability and delay based on actual communication conditions, transforming the static beam pairing process into a flexible, condition-dependent mechanism.
2Speed
If beam pairing is skipped to reduce delay, then transmission speed increases, but communication reliability deteriorates
Solution Approach 1:
The patent applies partial action by implementing a simplified beam pairing procedure that uses a limited number of beams rather than exhaustive beam sweeping. The system configures a specific number of beams for synchronization signal transmission, which is sufficient to establish reliable communication without performing complete beam pairing. This partial beam pairing approach maintains adequate communication reliability while significantly reducing the time required, thus increasing transmission speed.
3Reliability
If synchronization is acquired from multiple sources, then synchronization reliability improves, but beam pairing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the beam pairing process into distinct phases: synchronization signal transmission phase and data transmission phase. During the synchronization phase, the receiving UE can acquire synchronization from multiple transmitting UEs using different beams, establishing multiple potential beam pairs. The system then segments these options and selects the optimal beam pair for data transmission based on measurement results. This segmentation allows the system to benefit from multiple synchronization sources while managing beam pairing complexity through structured phase separation.
Data Source
AI summary
A method for a first user equipment (UE), according to the present disclosure, comprises the steps of: beam sweeping a first physical sidelink control channel (PSCCH) including beam identification information and physical sidelink feedback channel (PSFCH) resource information, and transmitting same to a second UE; receiving the PSFCH from the second UE on the basis of the PSFCH resource information; pairing beams by determining, on the basis of transmission beam indication information included in the received PSFCH and a beam by which the PSFCH is received, a transmission beam and a reception beam to be used for sidelink communication; and sidelink-communicating with the second UE through the paired beams.