Valid RACH Occasions in Sub-Band Full Duplex
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, especially in sub-band full duplex (SBFD) resources, the validity of random access channel (RACH) occasions (ROs) is unclear due to the presence of both uplink and downlink resources, leading to potential conflicts with other communications and decreased RACH efficiency.
Innovation Solution
A method where a user equipment (UE) receives a sub-band configuration indicating the inclusion of an uplink sub-band and at least one of a downlink sub-band or a flexible sub-band, and transmits a RACH message on a RACH occasion (RO) that is associated with a valid status, specifically configured within the uplink sub-band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RACH occasions are configured in sub-band full duplex resources including both uplink and downlink sub-bands, then resource utilization is improved, but conflict with other communications increases and reliability deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into distinct uplink sub-bands and downlink sub-bands within the sub-band full duplex resource. By configuring RACH occasions only in uplink sub-bands and excluding downlink sub-bands, the system creates clear separation between uplink random access transmissions and downlink communications, preventing conflicts while maintaining high resource utilization.
2Productivity
If RACH occasions are configured in sub-band full duplex resources, then resource utilization is improved, but conflict with other communications increases
Solution Approach 1:
The patent divides the frequency resource into uplink sub-bands and downlink sub-bands, configuring RACH occasions exclusively in uplink sub-bands. This segmentation prevents harmful interference and conflicts between RACH transmissions and downlink communications by ensuring they occur in separate frequency regions.
Solution Approach 2:
The patent applies different quality characteristics to different sub-bands: uplink sub-bands are configured with RACH occasions to enable random access, while downlink sub-bands are configured without RACH occasions to ensure clean downlink communication. This local differentiation optimizes each sub-band for its specific purpose.
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 sub-band configuration indicating that a time resource is configured to include an uplink sub-band and at least one of a downlink sub-band or a flexible sub-band. The UE may transmit a random access channel (RACH) message on a RACH occasion (RO), wherein the RO is associated with a valid status in association with whether the RO is configured in the uplink sub-band. Numerous other aspects are described.