SBFD Symbol Priority Rules for Multi-Collision Half-Duplex UEs
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Solution Overview
Problem
Wireless communications systems face challenges in resolving multiple collisions in sub-band full-duplex (SBFD) symbols due to overlapping uplink and downlink transmissions, leading to uncertainties in collision resolution order and handling of multiplexed messages.
Innovation Solution
A method and apparatus for a half-duplex UE to resolve multiple SBFD collisions by prioritizing collision types and applying specific collision rules based on transmission directions and message overlaps, enabling effective communication of scheduled messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-band full-duplex symbols are used to enable simultaneous uplink and downlink transmissions, then spectral efficiency is improved, but multiple collisions occur between uplink and downlink messages leading to uncertainty in collision resolution order
Solution Approach 1:
The patent segments the SBFD symbol into distinct uplink sub-bands and downlink sub-bands with guard bands between them. This segmentation allows independent handling of uplink and downlink transmissions in different frequency portions, reducing the complexity of resolving collisions by treating them as separate manageable units rather than a monolithic complex problem.
Solution Approach 2:
The patent establishes predetermined collision resolution rules and priority orders before collisions occur. The network entity configures the UE with specific collision handling procedures in advance, so when collisions happen, the UE can automatically apply the pre-defined rules without real-time complex decision-making, thus reducing resolution complexity while maintaining high spectral efficiency.
2Productivity
If multiple messages are multiplexed during an SBFD symbol, then message throughput is improved, but handling of multiplexed messages becomes uncertain due to overlapping transmissions
Solution Approach 1:
The patent applies different collision handling strategies to different types of messages based on their priority and characteristics. High-priority messages like PUCCH and SRS are handled with specific rules that ensure their reliable transmission, while other messages follow different resolution paths. This localized quality approach ensures that critical messages maintain high reliability even when multiple messages are multiplexed together.
Solution Approach 2:
The patent introduces guard bands as intermediary frequency regions between uplink and downlink sub-bands. These guard bands act as buffers that prevent direct interference between opposing transmission directions, allowing multiplexed messages to coexist more reliably by providing frequency separation that reduces collision severity and improves message handling predictability.
3Ease of operation
If collision resolution rules are established for different SBFD collision types, then collision handling becomes more systematic, but the number of collision types and resolution rules increases complexity
Solution Approach 1:
The patent creates a universal collision resolution framework that handles multiple collision types through a unified priority-based mechanism. Instead of creating entirely separate resolution procedures for each collision type (frequency domain, time domain, same direction, different direction), the patent uses a single systematic approach where all collisions are evaluated against a common priority order of message types, simplifying the overall system while maintaining comprehensive coverage.
Solution Approach 2:
The patent resolves the complexity of multiple collision types by introducing a priority dimension rather than treating each collision type separately. Instead of creating complex resolution logic for each of the four collision types, the patent adds a priority ordering dimension that cuts across all collision types, allowing systematic handling through a single hierarchical evaluation layer that works universally for all SBFD collision scenarios.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a half-duplex user equipment (UE) may receive a configuration message indicating one or more sub-band full-duplex (SBFD) symbols for a network entity. Additionally, the UE may receive one or more control messages scheduling, during an SBFD symbol, multiple messages including one or more uplink messages, one or more downlink messages, or both, where the multiple messages result in multiple SBFD collisions within the SBFD symbol and where the multiple SBFD collisions are associated with one or more SBFD collision types. Thus, the UE may communicate, via the SBFD symbol, at least a subset of the multiple messages based on resolving the set of multiple SBFD collisions in accordance with an SBFD collision type priority order, one or more SBFD collision rules, or both.