SBFD RACH and Uplink Occasion Mapping for Lower Access Latency
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Solution Overview
Problem
UEs not configured for sub-band full duplex (SBFD) techniques cannot perform preamble or payload transmissions if scheduled within uplink sub-bands of downlink SBFD slots, leading to increased latency for those capable of SBFD.
Innovation Solution
UEs are configured to interpret and perform transmissions during uplink sub-bands of downlink SBFD slots for ROs and POs, with techniques for mapping preambles to POs maintaining consistency across all UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UEs are configured to perform transmissions during uplink sub-bands of downlink SBFD slots, then latency is reduced for SBFD-capable UEs, but UEs not configured for SBFD cannot perform transmissions and experience increased latency
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands within downlink slots, designating specific uplink sub-bands for SBFD operations. This allows the system to divide resources such that SBFD-capable UEs can utilize designated uplink sub-bands for random access and data transmissions, while non-SBFD UEs operate in traditional uplink slots, thereby reducing latency for SBFD UEs without compromising compatibility with legacy devices
Solution Approach 2:
The patent applies local quality by enabling different transmission capabilities in different frequency regions. Specifically, certain sub-bands within downlink slots are configured with uplink properties for SBFD operations, while other portions maintain traditional downlink characteristics. This localized differentiation allows SBFD-capable UEs to perform transmissions in designated sub-bands while non-SBFD UEs continue to function normally in other areas
2Productivity
If ROs and POs are scheduled in downlink SBFD slots, then resource utilization is improved, but interference management becomes more complex
Solution Approach 1:
The patent segments downlink slots into multiple sub-bands with different directional properties. Uplink sub-bands are specifically designated for random access channel (RACH) and physical uplink shared channel (PUSCH) transmissions, while downlink sub-bands maintain traditional downlink functionality. This segmentation enables efficient resource utilization by allowing simultaneous uplink and downlink operations in different frequency regions, while the structured sub-band organization simplifies interference management through predictable spatial and frequency separation
Solution Approach 2:
The patent introduces sub-band configuration as an intermediary layer between traditional TDD and full-duplex operations. By configuring specific sub-bands as uplink sub-bands within downlink slots, the system creates a controlled intermediate state that enables dual-directional communication while maintaining manageable interference levels through frequency-domain isolation and coordinated resource allocation
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A UE may be configured to interpret random access channel occasions (ROs), physical uplink shared channel occasions (POs), or both, scheduled during an uplink sub-band of a downlink sub-band full duplex (SBFD) slot to be valid for preamble transmissions or payload transmissions. For example, one or more POs may be scheduled during an uplink sub-band of an SBFD slot for payload transmissions by UEs operating using SBFD techniques. Additionally, or alternatively, one or more ROs may be scheduled during an uplink sub-band of an SBFD slot for preamble transmissions by UEs operating using SBFD techniques. For example, some ROs, POs, or both, may be valid for all UEs, while other ROs, POs, or both, scheduled during uplink sub-bands of SBFD slots may be valid for UEs operating using the SBFD techniques, and preamble mappings may be performed accordingly.