SBFD Random Access Mapping with Separate SSB and Preamble Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing increased communication traffic and latency in next-generation 5G systems, particularly in scenarios requiring ultra-reliability and low latency, such as vehicle-to-everything (V2X) and factory automation, due to limitations in random access channel (RACH) resource allocation in subband full-duplex (SBFD) communication.
Innovation Solution
A method and apparatus for a terminal to receive and acquire RACH resource information for SBFD and non-SBFD symbols, mapping synchronization signal blocks (SSBs) and preambles, allowing efficient determination of RACH occasions, with configurations that can be independent or inclusive of each other, to optimize PRACH resource utilization in SBFD and non-SBFD areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RACH resource allocation is optimized for SBFD symbols, then PRACH resource efficiency is improved, but mapping complexity between SSBs and RACH occasions increases
Solution Approach 1:
The patent changes the mapping parameters by introducing separate mapping information for SBFD and non-SBFD symbols. It configures different numbers of SSBs per RACH occasion and different numbers of preambles per SSB for SBFD versus non-SBFD symbols, allowing optimized resource allocation for each symbol type while maintaining manageable complexity through structured parameter separation.
Solution Approach 2:
The patent segments the RACH resource allocation into separate configurations for SBFD symbols and non-SBFD symbols. By dividing the mapping into distinct parameters (first mapping information for SBFD, second mapping information for non-SBFD), it optimizes each segment independently while reducing overall system complexity through modular configuration.
2Reliability
If separate RACH resource configurations are used for SBFD and non-SBFD symbols, then communication performance is improved, but configuration complexity increases
Solution Approach 1:
The patent applies local quality by configuring RACH resources differently for SBFD and non-SBFD symbols based on their specific characteristics. Each symbol type receives tailored mapping information optimized for its properties, improving communication performance for each local context while maintaining overall system functionality through differentiated configuration.
3Loss of time
If RACH delay is reduced through optimized resource allocation, then latency performance is improved, but resource management complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring separate mapping information for SBFD and non-SBFD symbols before random access procedures begin. This advance configuration enables terminals to quickly determine appropriate RACH occasions without complex real-time decisions, reducing RACH delay while managing resource management complexity through pre-established rules.
Data Source
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AI summary
Provided are a method and apparatus for performing random access in subband full duplex (SBFD) communication. The method of the terminal may include receiving first random access channel (RACH) resource information for a SBFD symbol and second RACH resource information for a non-SBFD symbol, and acquiring i) first mapping information regarding a number of synchronization signal blocks (SSBs) mapped per SBFD symbol-based RACH occasion, and ii) second mapping information regarding a number of preambles allocated per SSB for the SBFD symbol-based RACH occasion.