Unified DCI Control Channel Design for Dynamic Full Duplex
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Solution Overview
Problem
Current wireless communication systems face challenges in reliably indicating full duplex operations, leading to increased system latency and decreased user experience due to incorrect parameter selection by user equipment (UE) when decoding downlink control information (DCI) messages, resulting in failed transmissions and retransmissions.
Innovation Solution
The implementation of dynamic control channel designs that include a base station transmitting a single DCI with no more than one downlink and one uplink grant, using dedicated and shared fields for condensed signaling, and configuring periodic or semi-periodic resources to indicate full duplex operations, allowing the UE to accurately decode and prepare for overlapping uplink and downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a base station transmits separate DCI messages for uplink and downlink grants, then the UE can receive scheduling information, but the system latency increases and transmission reliability decreases due to parameter selection errors
Solution Approach 1:
The patent combines separate uplink and downlink grant DCI messages into a single unified DCI message that schedules both transmissions simultaneously. This merging eliminates the need for the UE to process multiple separate messages and makes the full duplex operation explicit, thereby reducing system latency and improving transmission reliability by preventing parameter selection errors.
Solution Approach 2:
The unified DCI message serves multiple functions: it provides both uplink and downlink scheduling information, indicates full duplex operation status, and supplies all necessary transmission parameters in a single message. This multi-functionality reduces the overall signaling overhead and eliminates timing gaps between separate grant messages.
2Loss of information
If the DCI message size is large with detailed grant information, then complete scheduling information is provided, but the decoding complexity and error probability increase
Solution Approach 1:
The patent segments the DCI message into distinct fields: a first field indicating full duplex operation status, a second field containing uplink grant information, and a third field containing downlink grant information. This structured segmentation organizes the complete scheduling information in a way that reduces decoding complexity and minimizes error probability while maintaining information completeness.
3Adaptability or versatility
If the base station configures flexible dynamic scheduling, then the system adapts to varying traffic conditions, but the UE may incorrectly interpret parameters leading to failed transmissions
Solution Approach 1:
The patent implements dynamic scheduling through a unified DCI message that can adapt to varying traffic conditions while maintaining clear parameter definitions. The message includes explicit fields for full duplex indication, uplink grants, and downlink grants, allowing flexible resource allocation while preventing UE misinterpretation through well-defined parameter structures.
Solution Approach 2:
The unified DCI message provides explicit feedback to the UE about the full duplex operation status through a dedicated indication field. This clear signaling prevents the UE from incorrectly interpreting parameters by explicitly stating whether simultaneous uplink and downlink transmissions are scheduled, thereby improving parameter interpretation accuracy.
4Productivity
If separate DCI messages are used for uplink and downlink, then scheduling flexibility is maintained, but the signaling overhead increases and efficiency decreases
Solution Approach 1:
The patent merges separate uplink and downlink grant DCI messages into a single unified message, reducing the total number of DCI transmissions required. This consolidation decreases signaling overhead and improves system efficiency by eliminating redundant message structures and reducing the processing burden on the UE.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a base station may dynamically and reliably indicate that pending transmissions are part of a full duplex operation via downlink control information (DCI) designs described herein. For example, a base station may transmit, to a user equipment (UE) a DCI including no more than one downlink grant and no more than one uplink grant for a full duplex operation. In some examples, the base station may transmit a first-stage DCI including partial information, and second-stage DCIs including full uplink and downlink grants for a full duplex operation. In some examples, the base station may configure periodic or semi-periodic uplink and downlink resources that may overlap in time, and may dynamically indicate, to the UE, whether the overlapping uplink and downlink resources are scheduled for a full duplex operation.