Random Access Occasion Switching for Subband Full Duplex UEs
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing random access occasions for subband full duplex devices, leading to collisions, increased latency, and inefficient resource use due to uncoordinated UE selection of random access occasion types, resulting in inconsistent and inefficient random access procedures.
Innovation Solution
Implementing timing constraints and rules for switching between subband full duplex and half duplex random access occasions, including association periods, SSB to RO mapping cycles, and time thresholds, to manage UE selection and reduce collisions and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs independently select random access occasion types without coordination, then device autonomy and flexibility are improved, but collisions and resource conflicts increase
Solution Approach 1:
The system dynamically switches between two operational modes: uncoordinated random access (URAO) mode where UEs independently select random access occasions, and coordinated random access (CRAO) mode where the network coordinates UE selections. This dynamic adaptation allows the system to balance UE flexibility with collision reduction based on current network conditions and traffic patterns
Solution Approach 2:
The network periodically switches between URAO and CRAO modes according to configured time patterns and association periods. This periodic switching enables the system to alternate between high-freedom periods (URAO) and low-collision periods (CRAO), optimizing the balance between adaptability and reliability over time
2Adaptability or versatility
If switching between random access occasion types is allowed without time constraints, then adaptability is improved, but switching complexity and timing conflicts increase
Solution Approach 1:
The network pre-configures time thresholds, association periods, and switching rules before random access operations begin. UEs are provided with advance information about when mode switching will occur and what time constraints apply, eliminating the need for complex real-time negotiation and reducing switching coordination complexity
Solution Approach 2:
The system changes operational parameters such as time thresholds, association periods, and random access occasion configurations to control switching behavior. By adjusting these parameters, the network manages the balance between adaptability and complexity without requiring complex switching logic
3Productivity
If multiple random access occasion types are supported simultaneously, then resource utilization is improved, but collision probability increases
Solution Approach 1:
The random access resource pool is segmented into different types of random access occasions (URAO and CRAO) with distinct time, frequency, and spatial characteristics. This segmentation allows simultaneous support for multiple access types while reducing collisions through resource separation and dedicated allocation strategies for each type
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may support switching to another type of random access occasion (RO) to another type of RO based on a boundary of an association period. In some examples, the UE may support switching between the two types of ROs based on the boundary of an association pattern period. In some examples, the UE may support switching between the two types of ROs based on a synchronization signal block (SSB) to RO mapping cycle. In some examples, the UE may support switching between the types of ROs based on a time threshold from a latest transmission.