SBFD Random Access Resource Mapping for PRACH Delay Reduction
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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 subband full-duplex communication, where PRACH resources are not optimally allocated, leading to RACH delays and inefficiencies.
Innovation Solution
A method and apparatus for a terminal to receive and utilize separate RACH resource information for SBFD and non-SBFD symbols, acquiring mapping information about synchronization signal blocks and preambles, allowing efficient determination of RACH occasions and preamble transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate RACH resource information is allocated for SBFD and non-SBFD symbols, then PRACH resource utilization is improved, but device complexity increases
Solution Approach 1:
The patent segments RACH resources by symbol type (SBFD vs. non-SBFD), creating separate RACH resource information configurations for each. This segmentation allows the terminal to select appropriate RACH occasions based on the current symbol type, improving resource utilization by preventing conflicts in SBFD symbols while maintaining backward compatibility with non-SBFD operations.
Solution Approach 2:
The patent introduces dynamic selection capability where the terminal can adaptively choose between SBFD-based and non-SBFD-based RACH resources depending on the current symbol configuration. This dynamic approach enables the system to flexibly respond to varying SBFD patterns without requiring fixed resource allocation, thereby improving overall resource efficiency.
2Productivity
If RACH resources are optimized for SBFD communication, then random access efficiency is improved, but RACH delay increases due to separate mapping information acquisition
Solution Approach 1:
The patent applies preliminary action by pre-configuring both SBFD-based and non-SBFD-based RACH resource information in advance. The terminal receives and stores mapping information for both types of RACH occasions beforehand, enabling it to immediately select the appropriate resource without requiring real-time determination or additional signaling delays during the random access procedure.
3Measurement precision
If mapping information for SSBs and preambles is acquired separately, then mapping precision is improved, but information processing complexity increases
Solution Approach 1:
The patent segments mapping information into two distinct components: (i) mapping information between SSBs and RACH occasions, and (ii) mapping information between preambles and SSBs. This segmentation allows each mapping relationship to be independently configured and optimized, ensuring precise mapping while enabling the terminal to process only the relevant mapping information needed for its specific random access scenario.
Data Source
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.