SBFD Sub-Band Restrictions for Dynamic TDD Interference Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in mitigating cross-link interference (CLI) between user equipment (UEs) and network entities due to unpredictable slot configurations in sub-band full-duplex (SBFD) and dynamic time division duplex (TDD) operations, making it difficult to coordinate and reduce interference effectively.
Innovation Solution
Implementing resource restrictions by configuring UEs with slot-specific sub-band availability or duplexing settings, where control signaling modifies the availability or duplexing settings for specific sub-bands, allowing UEs to communicate via a subset of sub-bands in accordance with these restrictions, thereby reducing CLI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-band full-duplex and dynamic TDD operations are implemented to improve communication flexibility and resource utilization, then communication efficiency is improved, but cross-link interference between UEs and network entities increases due to unpredictable slot configurations
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands and applies different duplexing settings to different sub-bands within the same slot. This allows the network to restrict certain sub-bands for uplink-only or downlink-only operation while allowing full-duplex operation in other sub-bands, thereby reducing cross-link interference in specific frequency regions while maintaining overall communication efficiency.
Solution Approach 2:
The patent implements dynamic slot configuration where the duplexing setting (uplink, downlink, or full-duplex) can change from slot to slot and from sub-band to sub-band within a slot. This dynamic adaptability allows the system to optimize resource allocation while managing interference patterns, improving communication efficiency without being constrained by fixed slot structures.
2Adaptability or versatility
If slot configurations are made unpredictable to improve system adaptability, then system flexibility is improved, but coordination between UEs and network entities becomes difficult, increasing interference
Solution Approach 1:
The network entity performs preliminary configuration by providing control signaling to UEs that indicates the duplexing setting for each slot and each sub-band before communication occurs. This advance notification allows UEs to prepare their transmit/receive operations accordingly, maintaining system flexibility while ensuring proper coordination and reducing interference through predictable, pre-announced slot configurations.
Solution Approach 2:
The system implements feedback mechanisms where UEs report channel conditions and interference levels to the network entity, which then adjusts the slot configuration and sub-band restrictions accordingly. This closed-loop control enables the system to adapt to changing conditions while maintaining coordination between network entities and UEs, balancing flexibility with ease of operation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support resource restrictions for sub-band full duplex (SBFD) and dynamic time division duplex (TDD) operations. For example, a user equipment (UE) may receive, from a network entity, control signaling indicating a restriction to one or more slots associated with communications between the UE and the network entity. Each of the one or more slots may be associated with one or more sub-bands and the restriction may modify an availability of a duplexing setting for at least a portion of the one or more sub-bands. Additionally, the UE may communicate with the network entity via at least a subset of the one or more sub-bands of the one or more slots in accordance with the restriction.