Random Access Occasions for Connected Mode and Initial Access
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing random access occasions for connected and initial access modes, leading to increased latency and wasted network resources due to errors or interference during initial access procedures.
Innovation Solution
The system supports different sets of random access occasions for connected mode operation, including subband full-duplex (SBFD) symbols and uplink symbols, allowing user equipment (UE) to transmit random access messages based on its operating mode, and uses these occasions for both connected and initial access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate random access occasions are configured for connected mode and initial access mode, then resource utilization improves and latency reduces, but system complexity increases
Solution Approach 1:
The patent segments random access occasions into distinct sets for connected mode operations and initial access operations. The network entity configures separate random access occasion sets, allowing UEs to use appropriate occasions based on their operational state, thereby improving resource utilization while managing complexity through structured separation.
Solution Approach 2:
The patent implements dynamic selection of random access occasions based on UE operational mode. UEs dynamically determine which random access occasion set to use based on whether they are in connected mode or initial access mode, enabling flexible and efficient resource allocation that adapts to changing system conditions.
2Productivity
If random access messages are transmitted during SBFD symbols, then spectral efficiency improves, but interference increases
Solution Approach 1:
The patent applies local quality by allowing random access messages to be transmitted during specific subbands within SBFD symbols where uplink transmission is permitted. The network entity configures random access occasions that are localized to appropriate subbands, enabling spectral efficiency gains from SBFD operation while minimizing interference by avoiding subbands designated for downlink transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an indication of random access occasions for connected mode operation. The random access occasions may span subband full-duplex (SBFD) symbols (including uplink subbands and downlink or flexible subbands) and uplink symbols. In some cases, the random access occasions may include a first subset of random access occasions for the SBFD symbols and a second subset of random access occasions for the uplink symbols, the second subset also for initial access operation. The UE may transmit a random access message via the random access occasions based on being in a connected operating mode. If a downlink message is also scheduled via the random access occasions, the UE may use a prioritization rule to determine whether to use the set of random access occasions for downlink message reception or random access message transmission.