RACH Occasion Sharing by Slot Type for Lower Access Latency
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing random access channel occasion (RO) sharing between different slot types, such as half-duplex (HD) and subband full-duplex (SBFD) slots, leading to suboptimal RO use and increased latency in random access procedures.
Innovation Solution
Implementing a method and apparatus for indicating a specific RO sharing behavior for different slot types, allowing for differentiated RO usage between 2-step and 4-step RACH messages in SBFD slots, thereby optimizing RO utilization and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RO sharing behavior is not differentiated between slot types, then configuration simplicity is maintained, but RO utilization efficiency deteriorates
Solution Approach 1:
The patent segments the RO sharing behavior configuration by slot type, introducing separate indication fields for first slot types (e.g., HD slots) and second slot types (e.g., SBFD slots). This segmentation allows optimized RO utilization for each slot type while maintaining overall configuration manageability through structured parameter separation.
Solution Approach 2:
The patent implements dynamic configuration of RO sharing behavior based on slot type characteristics. The network device can independently adjust RO sharing parameters for different slot types, enabling adaptive optimization of random access procedures according to specific slot requirements without freezing the entire configuration.
2Loss of time
If RO sharing behavior is not differentiated between slot types, then configuration management is simplified, but random access latency increases
Solution Approach 1:
The patent divides the RO sharing configuration into slot-type-specific parameters, allowing independent optimization of random access procedures for different slot types. This enables reduced latency for time-sensitive slot types while maintaining appropriate configurations for other slot types, achieving overall latency reduction without excessive complexity.
Solution Approach 2:
The patent changes the RO sharing behavior parameters based on slot type characteristics. By introducing slot-type-dependent configuration parameters, the system can optimize random access latency for specific slot types (e.g., allowing RO sharing in SBFD slots) while maintaining appropriate configurations for other slot types.
3Productivity
If differentiated RO sharing behavior is implemented for different slot types, then RO utilization efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the configuration signaling into slot-type-specific fields, allowing precise indication of RO sharing behavior for each slot type. This segmented approach reduces signaling overhead compared to separate configurations for each parameter, as it enables compact representation of differentiated behaviors through structured parameter groups.
Solution Approach 2:
The patent creates a universal configuration framework that handles multiple slot types through a unified parameter structure. The RO sharing behavior indication mechanism serves multiple slot types simultaneously, reducing overall signaling overhead compared to completely separate configurations for each slot type.
4Reliability
If differentiated RO sharing behavior is implemented for different slot types, then random access performance is enhanced, but system complexity increases
Solution Approach 1:
The patent segments the random access configuration by slot type, enabling optimized performance for each slot type through targeted parameter adjustment. This segmentation improves random access performance by allowing specific optimizations for SBFD slots and HD slots independently, while maintaining manageable system complexity through structured parameter organization.
Solution Approach 2:
The patent implements parameter changes in the RO sharing behavior configuration based on slot type. By introducing slot-type-dependent parameters, the system enhances random access performance for specific slot types while maintaining appropriate configurations for other slot types, achieving performance improvement without excessive system complexity.
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 2-step random access channel (RACH) configuration that indicates a RACH occasion (RO) sharing behavior that is a first behavior for a first slot type and a second behavior for a second slot type. The UE may transmit a RACH message in an RO based at least in part on the RO sharing behavior. Numerous other aspects are described.