Sidelink Beam Acquisition Using Spatial Filter Assistance
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently establishing initial beams for sidelink communication, particularly in high-frequency bands like 28 GHz or 60 GHz, due to hardware constraints and increased propagation loss, which affect data transmission and reception efficiency.
Innovation Solution
The implementation of multiple spatial domain transmission filters for transmitting and receiving first physical sidelink control and shared channels, along with assistance information exchange between user equipment (UEs) to determine optimal spatial domain transmission filters, enabling improved beam acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple spatial domain transmission filters are used for transmitting physical sidelink control and shared channels, then beam acquisition capability and coverage are improved, but device complexity and processing overhead increase
Solution Approach 1:
The transmitting UE sends assistance information containing spatial domain transmission filter indications before the actual data transmission. This preliminary action allows the receiving UE to prepare the appropriate spatial domain reception filter in advance, improving beam acquisition efficiency without increasing the complexity of the data transmission process itself
Solution Approach 2:
Assistance information acts as an intermediary message that carries spatial domain transmission filter indications from the transmitting UE to the receiving UE. This intermediary enables the receiving UE to determine the correct spatial domain reception filter without requiring complex real-time beam searching or trial-and-error approaches
2Measurement precision
If assistance information containing spatial domain transmission filter indications is transmitted, then beam alignment accuracy is improved, but information overhead and transmission resources increase
Solution Approach 1:
The assistance information contains indications of spatial domain transmission filters selected from a predefined codebook. By changing the parameter representation from full filter descriptions to compact codebook indices, the patent achieves high beam alignment accuracy while minimizing information overhead and transmission resource consumption
Solution Approach 2:
The assistance information is transmitted only when needed for sidelink initial beam acquisition or beam refinement, not continuously for all transmissions. This localized application of the assistance information mechanism reduces overall information overhead while maintaining high beam alignment accuracy when it is most needed
Data Source
AI summary
Method and apparatus for sidelink (SL) initial beam acquisition in a wireless communication system. A method for operating a user equipment (UE) includes transmitting, to a second UE, first physical sidelink control channels (PSCCHs) and corresponding first physical sidelink shared channels (PSSCHs) using multiple spatial domain transmission filters, respectively. The first PSCCHs and the corresponding first PSSCHs includes a first link establishment message. The method further includes receiving, from the second UE, assistance information associated with a spatial domain transmission filter. The method further includes determining, based on the assistance information, the spatial domain transmission filter. The method further includes transmitting, based on the spatial domain transmission filter, a second PSCCH and a corresponding second PSSCH to the second UE.