Frequency Domain Slot Format Indication in Downlink Control Information
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Solution Overview
Problem
Current wireless communication systems lack a mechanism to effectively indicate frequency domain slot format configurations for full duplex (FD) slots in downlink control information (DCI), leading to inefficiencies in FD operation.
Innovation Solution
The method involves transmitting DCI from a base station to user equipment (UE) that includes a plurality of frequency domain slot format indications (SFIs), allowing the UE to determine the appropriate frequency domain SFI for FD slots, thereby enabling accurate configuration of FD frequency domain configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DCI mechanisms are used without frequency domain SFI indication, then the system maintains simplicity in control signaling, but full duplex slot operations cannot be properly configured in the frequency domain
Solution Approach 1:
The patent segments the slot format indication by introducing a frequency domain SFI field that divides the bandwidth into multiple subbands, each with its own slot format configuration. This allows different frequency regions to have different slot formats (uplink, downlink, or flexible), enabling precise FD slot configuration without requiring complete redesign of the DCI structure.
Solution Approach 2:
The patent adds a frequency domain dimension to the traditional time-domain slot format indication. By introducing frequency domain SFI that operates alongside time domain slot formats, the system can specify different slot formats for different frequency subbands within the same time slot, enabling full duplex operations where uplink and downlink transmissions occur simultaneously in different frequency regions.
2Reliability
If multiple frequency domain SFIs are transmitted in DCI, then accurate FD slot configuration is achieved, but the size and processing complexity of DCI increases
Solution Approach 1:
The patent applies local quality by allowing different slot format configurations for different frequency subbands rather than applying a uniform configuration across the entire bandwidth. Each subband can be independently configured with appropriate slot formats based on local traffic requirements, enabling precise control where needed while avoiding unnecessary signaling overhead in other regions.
Solution Approach 2:
The patent changes the parameters of DCI by introducing new fields for frequency domain SFI indication, including subband configuration parameters and slot format indicators specific to each frequency region. These parameter additions enable accurate FD slot configuration while the system can dynamically adjust the granularity of subband division to balance between configuration accuracy and signaling overhead.
Data Source
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Figure 3A~3C
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive, from a base station, downlink control information that includes a plurality of frequency domain slot format indications (SFIs), and communicate with the base station based at least in part on a frequency domain SFI of the plurality of frequency domain SFIs. Numerous other aspects are provided.