Sub-Band Full-Duplex PRACH Mapping for Accurate SSB Beam Selection
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Solution Overview
Problem
Ambiguity in mapping synchronization signal blocks (SSBs) to random access channel (RACH) occasions (ROs) occurs due to different mapping configurations for sub-band full-duplex (SBFD) and non-SBFD UEs, leading to incorrect determination of the selected SSB and beam by the network node.
Innovation Solution
Implementing separate RACH configurations for uplink symbols and SBFD symbols to define distinct mappings of SSBs to ROs, preventing ambiguity and ensuring accurate determination of the selected SSB and beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate RACH configurations are implemented for uplink symbols and SBFD symbols, then mapping accuracy between SSBs and ROs is improved, but device complexity increases
Solution Approach 1:
The patent divides the RACH configuration into separate configurations for uplink symbols and SBFD symbols. Each configuration contains specific parameters (such as timeFrequencyResources, ssbToRachMapping) that define the mapping relationship between SSBs and ROs for the respective symbol type. This segmentation allows the network to provide dedicated mapping information for each symbol type, eliminating ambiguity in SSB-to-RO mapping and improving measurement precision.
2Reliability
If separate RACH configurations are implemented for uplink symbols and SBFD symbols, then PRACH transmission clarity is improved, but protocol complexity increases
Solution Approach 1:
The patent applies local quality by providing configuration parameters specific to each symbol type (uplink or SBFD). Each configuration includes localized parameters such as timeFrequencyResources and ssb_to_rachMapping that are tailored to the characteristics of that specific symbol type. This ensures that the PRACH transmission clarity is optimized for each symbol type while maintaining overall protocol functionality.
3Device complexity
If unified RACH configuration is used for all symbol types, then device complexity is reduced, but mapping ambiguity occurs
Solution Approach 1:
The patent segments the RACH configuration into separate configurations for uplink symbols and SBFD symbols. Each configuration contains specific parameters (such as timeFrequencyResources, ssb_toRachMapping) that define the mapping relationship between SSBs and ROs for the respective symbol type. This segmentation allows the network to provide dedicated mapping information for each symbol type, eliminating ambiguity in SSB-to-RO mapping and improving measurement precision.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information indicating a random access channel (RACH) configuration applicable to sub-band full-duplex (SBFD) symbols. The UE may transmit a physical random access channel (PRACH) transmission in a RACH occasion (RO) of one or more ROs determined in accordance with the RACH configuration. Numerous other aspects are described.