SBFD Random Access Using TDD and SBFD RACH Occasion Mapping
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Solution Overview
Problem
In wireless communication systems, subband non-overlapping full duplex (SBFD) terminals and legacy terminals have different valid random access channel (RACH) occasions due to differing SSB connections, leading to ambiguity for base stations in determining downlink beamforming information for PRACH transmission.
Innovation Solution
A method for determining valid RACH occasions in SBFD and TDD resource configurations, using index determination for both SBFD and TDD resource configurations to clarify SSB connections and improve PRACH transmission accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SBFD terminals use different SSB connections than legacy terminals, then SBFD terminals can utilize more RACH occasions, but base stations experience ambiguity in determining downlink beamforming information
Solution Approach 1:
The patent segments RACH occasions into two distinct types: first RACH occasions associated with TDD resource configuration and second RACH occasions associated with SBFD resource configuration. This segmentation allows SBFD terminals to access additional second RACH occasions while maintaining clear association with specific SSBs, thereby resolving the ambiguity issue while increasing overall RACH availability
Solution Approach 2:
The patent applies local quality by configuring different resource characteristics for different RACH occasion types. First RACH occasions use TDD resource configuration with specific beamforming properties, while second RACH occasions use SBFD resource configuration with different beamforming properties. This localized differentiation enables terminals to select appropriate RACH occasions based on their capabilities and the base station to determine beamforming information unambiguously
2Productivity
If base stations configure both TDD and SBFD resource configurations, then SBFD UEs can access additional RACH occasions, but the device complexity for managing multiple configurations increases
Solution Approach 1:
The patent implements dynamic configuration management where the base station activates specific resource configurations (TDD or SBFD) based on terminal capability indications. The terminal dynamically selects which configuration type to use based on its capabilities, and the base station dynamically determines which configuration to apply for beamforming information retrieval. This dynamic approach reduces the effective complexity by avoiding simultaneous management of all configurations for all terminals
Data Source
AI summary
The present disclosure relates to a communication technique and system for combining an IoT technology with a 5G communication system for supporting a higher data transfer rate than a 4G system. According to an embodiment of the present invention, a method of a terminal supporting subband non-overlapping full duplex (SBFD) in a wireless communication system may comprise the steps of: receiving time duplex division (TDD) resource configuration information and SBFD resource configuration information from a base station; determining respective indexes of first random access channel (RACH) occasions that are commonly valid in the TDD resource configuration information and the SBFD resource configuration information; and determining respective indexes of second RACH occasions that are invalid in the TDD resource configuration information and are valid in the SBFD resource configuration information.