Unified DCI Scheduling for Sub-Band Full-Duplex MCS Offset
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in scheduling simultaneous downlink and uplink transmissions in unpaired spectrum, particularly in sub-band full-duplex operations, due to separate control information messages for downlink and uplink, which increase signaling overhead and latency.
Innovation Solution
A method where a single downlink control information (DCI) message schedules simultaneous downlink and uplink transmissions in an unpaired band, with the DCI message including a modulation and coding scheme (MCS) field that indicates a first MCS for downlink transmission, and a second MCS for uplink transmission is determined based on an offset from the first MCS, reducing signaling overhead and ensuring correlated transmission parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate control information messages are used for downlink and uplink scheduling, then each transmission can be independently controlled, but signaling overhead and latency increase
Solution Approach 1:
The patent combines separate downlink and uplink control information messages into a single unified DCI message that schedules both transmissions simultaneously. This merging approach reduces signaling overhead by eliminating redundant control signaling while enabling coordinated resource allocation for both downlink and uplink transmissions in the same time slot.
Solution Approach 2:
The single DCI message serves multiple functions by simultaneously scheduling both downlink and uplink transmissions. The message includes separate MCS fields for downlink and uplink, allowing it to control both transmission directions with a single control signal, thereby reducing the number of control messages needed.
2Loss of time
If a single DCI message schedules both downlink and uplink transmissions, then signaling overhead is reduced, but the complexity of the control message increases
Solution Approach 1:
The control message is segmented into distinct fields for downlink and uplink scheduling information. Each field contains specific parameters (such as separate MCS fields) for the respective transmission direction, allowing the complex message to be organized into manageable segments that can be processed independently.
Solution Approach 2:
The patent uses parameter changes in the MCS fields to indicate different transmission parameters for downlink and uplink. By varying the MCS values in the control message, the system can efficiently encode different modulation and coding schemes for each direction without requiring separate control messages.
3Productivity
If simultaneous downlink and uplink transmissions are enabled, then spectral efficiency improves, but self-interference occurs
Solution Approach 1:
The patent applies different quality parameters (MCS values) locally to downlink and uplink transmissions within the same time slot. By independently controlling the modulation and coding schemes for each direction through separate MCS fields in the DCI message, the system optimizes each transmission's performance while managing self-interference effects.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a single downlink control information (DCI) message scheduling a simultaneous downlink transmission and uplink transmission in an unpaired band. In some aspects, the single DCI message may include a modulation and coding scheme (MCS) field having one or more bits that indicate a first MCS for the downlink transmission. The UE may determine a second MCS for the uplink transmission based at least in part on an offset from the first MCS for the downlink transmission. Numerous other aspects are provided.