PRACH Configurations for SBFD Symbols to Reduce Access Collisions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing random access channels (PRACH) in subband full duplex (SBFD) operations due to undefined or inadequate PRACH configurations for SBFD-aware user equipment (UEs), leading to degraded performance in beam failure recovery and limited utilization of random access channel occasions (ROs) in SBFD symbols.
Innovation Solution
Define separate PRACH configurations for SBFD-aware UEs, based on TDD frequency range 1/2 (FR1/2) tables, allowing ROs in additional subframes and enabling distinct synchronization signal block (SSB)-to-RO mappings for SBFD slots, thereby improving UE performance in random access latency and reducing collision probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If separate PRACH configurations are defined for SBFD-aware UEs, then random access latency is improved and collision probability is reduced, but device complexity and configuration complexity increase
Solution Approach 1:
The patent segments PRACH configurations into separate legacy PRACH configuration and SBFD PRACH configuration, allowing SBFD-aware UEs to use optimized configurations specifically designed for subband full duplex operations. This segmentation enables reduced random access latency through dedicated SBFD parameters while maintaining backward compatibility with legacy configurations for other UEs.
Solution Approach 2:
The patent introduces dynamic configuration selection where UEs can adaptively choose between legacy and SBFD PRACH configurations based on their capabilities and network conditions. The network can dynamically indicate which configuration type to use through signaling, allowing flexible optimization of random access performance without requiring all UEs to support complex SBFD configurations.
2Productivity
If PRACH configurations are optimized for SBFD symbols, then utilization of random access channel occasions is improved, but compatibility with legacy configurations becomes problematic
Solution Approach 1:
The patent creates a universal PRACH configuration framework that supports both legacy and SBFD-specific configurations. The network can selectively apply different configuration types based on UE capabilities and operational requirements, allowing the system to maintain broad compatibility while enabling optimized SBFD performance where supported. This multi-functionality approach ensures that PRACH resources can be effectively utilized across different duplexing modes.
3Reliability
If distinct SSB-to-RO mappings are enabled for SBFD slots, then random access performance is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by implementing distinct SSB-to-RO mapping rules specifically for SBFD slots while maintaining standard mapping for legacy slots. This localized optimization allows SBFD-aware UEs to benefit from improved random access performance through dedicated mapping configurations tailored to SBFD characteristics, without requiring complex reconfiguration of the entire system. The differentiated approach targets complexity only where SBFD optimization is applicable.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a physical random access channel (PRACH) configuration for a random access procedure in subband full duplex (SBFD) symbols. The UE may transmit signaling in accordance with the random access procedure based at least in part on the PRACH configuration. Numerous other aspects are described.