PRACH Occasion Selection in Sub-Band Full-Duplex RACH
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Solution Overview
Problem
Existing wireless communication systems lack efficient mechanisms for UEs and network nodes to select between sub-band full-duplex (SBFD) and non-SBFD random access channel (RACH) occasions, leading to potential collisions and suboptimal resource utilization.
Innovation Solution
Implementing configuration information with selection indicators for UEs and network nodes to choose between SBFD and non-SBFD RACH occasions, using extended mask index fields and subset of synchronization signal blocks (SSBs) to optimize RO selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SBFD RACH occasions are configured for PRACH communication, then system capacity and spectrum efficiency are enhanced, but collision risk increases due to lack of selection mechanism
Solution Approach 1:
The patent introduces dynamic selection indicators that enable UEs to adaptively choose between SBFD and non-SBFD RACH occasions based on real-time network conditions and traffic characteristics. This dynamic adaptation allows the system to optimize between capacity utilization and collision avoidance on a per-communication basis.
Solution Approach 2:
The patent modifies the RACH configuration parameters by introducing selection indicators and extended mask index fields that change the operational parameters of RACH occasions. These parameter changes enable differentiated treatment of SBFD and non-SBFD occasions, allowing optimal resource selection while managing collision risk through configurable selection criteria.
2Productivity
If selection indicators are introduced for RO selection, then resource utilization is optimized, but configuration complexity increases
Solution Approach 1:
The patent designs the selection indicator mechanism to serve multiple functions: it enables SBFD/non-SBFD occasion differentiation, provides UE-autonomous selection capability, and maintains backward compatibility with existing RACH configurations. This multi-functionality approach optimizes resource utilization across diverse scenarios without proportionally increasing complexity.
Solution Approach 2:
The patent segments the RACH configuration into distinct SBFD and non-SBFD occasion types with separate selection indicators. This segmentation allows independent optimization of each occasion type while using a unified selection framework, reducing the complexity burden by organizing configuration parameters in a modular fashion.
3Loss of time
If UEs autonomously select RACH occasions based on configuration, then latency is reduced, but collision probability increases without coordination
Solution Approach 1:
The patent implements feedback mechanisms where network nodes provide configuration information including selection indicators that reflect network conditions. UEs use this feedback to make informed selection decisions, balancing rapid access with collision avoidance. The feedback loop enables adaptive behavior that reduces latency while managing collision risk through network-aware selection.
Solution Approach 2:
The patent applies preliminary action by pre-configuring selection indicators and mask index fields before the RACH selection process. This preliminary configuration provides UEs with advance information about available occasions and selection criteria, enabling faster autonomous decisions without increasing collision probability, as the configuration is established in advance rather than dynamically negotiated during access.
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 identifying a selection indicator for a physical random access channel (PRACH) communication in a sub-band full-duplex (SBFD) random access channel (RACH) occasion (RO) configured for the PRACH communication or in a non-SBFD RO configured for the PRACH communication. The UE may transmit the PRACH communication in the SBFD RO or the non-SBFD RO in accordance with the selection indicator. Numerous other aspects are described.