Dynamic Resource Management After Symbol Allocation Cancellation
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Solution Overview
Problem
Wireless communications systems experience interference due to communication direction mismatches between multiple slot format indications, leading to increased cross-link interference and inefficiencies in resource allocation.
Innovation Solution
A base station identifies communication direction mismatches and transmits cancelation or overwriting indications to adjust resource allocation for UEs, allowing them to communicate based on the first slot format indication and the cancelation indication to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple slot format indications are used to support dynamic resource allocation, then resource allocation flexibility is improved, but cross-link interference increases due to communication direction mismatches
Solution Approach 1:
The patent implements dynamic slot format indication where the communication direction (uplink/downlink/flexible) for each symbol can be dynamically changed through SFI messages. The base station can transmit multiple SFIs to different UEs, allowing each UE to adapt its resource allocation and communication direction dynamically, thus achieving flexible resource allocation while managing interference through dynamic adjustment rather than static configuration
Solution Approach 2:
The patent employs feedback mechanisms where UEs report their communication direction mismatches and interference conditions to the base station. The base station receives this feedback and adjusts the SFI assignments accordingly, creating a closed-loop system that continuously optimizes resource allocation while minimizing cross-link interference based on actual network conditions
2Object-affected harmful factors
If resource allocation is adjusted to reduce cross-link interference, then interference mitigation is improved, but communication efficiency decreases due to resource underutilization
Solution Approach 1:
The patent applies local quality by allowing different SFIs to be assigned to different UEs or different resource blocks within the same time slot. Instead of uniformly reducing resource allocation across the entire system, the base station can selectively adjust communication directions and resource allocations for specific UEs experiencing interference, thus mitigating cross-link interference locally while maintaining high communication efficiency for other UEs without interference
Solution Approach 2:
The patent changes the communication direction parameter (uplink/downlink/flexible) for specific symbols and UEs based on interference conditions. By dynamically modifying this parameter through SFI adjustments, the system can switch affected UEs to flexible or guard symbols to avoid interference, while other UEs continue to utilize resources at full capacity, thus achieving interference mitigation without system-wide efficiency loss
3Object-affected harmful factors
If cancelation indications are transmitted to adjust resource allocation, then interference is reduced, but system complexity increases due to additional signaling
Solution Approach 1:
The patent uses the existing SFI messaging infrastructure for multiple purposes: initial resource allocation, communication direction indication, and interference mitigation through cancelation indications. By making the SFI mechanism multi-functional, the system avoids introducing separate dedicated signaling protocols for interference management, thus reducing overall system complexity while still achieving effective interference reduction through the same signaling pathway
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A first device (e.g., a user equipment (UE)) may receive a first indication associated with the first device, where the first indication indicates a communication direction for each of a plurality of time periods for a time interval. The first device may receive a second indication for a set of time periods, where the second indication indicates a cancelation of communications at the first device during the set of time periods, and where the second indication is based on a communication direction mismatch between the first indication and a third indication. The first device may communicate with a base station during the time interval based on the first indication and the second indication.