Joint DCI and Data Encoding on PDSCH for URLLC
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Solution Overview
Problem
Current wireless communication systems face limitations in transmitting downlink control information (DCI) due to restricted search spaces in PDCCH, leading to blocking probabilities and reduced flexibility in resource allocation, especially in ultra-reliable low latency communication (URLLC) contexts, where reliability and latency are critical.
Innovation Solution
Transmitting DCI on a physical downlink shared channel (PDSCH) instead of or in addition to PDCCH, allowing for joint encoding with downlink data and reducing the need for blind decoding, thereby enhancing reliability and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI is transmitted on PDCCH with restricted search spaces, then control information can be delivered using existing infrastructure, but blocking probabilities increase and resource allocation flexibility is reduced
Solution Approach 1:
The patent merges DCI transmission with PDSCH by jointly encoding DCI and downlink data into a single codeword transmitted on PDSCH. This integration eliminates the separate PDCCH transmission path, thereby increasing resource allocation flexibility while maintaining transmission reliability through the combined channel structure.
Solution Approach 2:
The PDSCH channel is given multi-functionality by enabling it to carry both downlink data and DCI simultaneously through joint encoding. This universal approach allows a single channel to serve multiple purposes, reducing the need for dedicated control channels and improving overall resource utilization flexibility.
2Reliability
If DCI is transmitted on PDCCH, then control information can be delivered, but blind decoding is required which consumes processing resources
Solution Approach 1:
The patent extracts the blind decoding requirement from the DCI transmission process by moving DCI from PDCCH to PDSCH. Since PDSCH uses scheduled transmissions with known resource allocations rather than blind decoding, this extraction eliminates the processing burden on UE while preserving reliable control information delivery.
Solution Approach 2:
The patent introduces an intermediary mechanism where DCI is embedded within the PDSCH data transmission rather than being separately transmitted. This intermediary approach allows control information to be delivered reliably through the data channel without requiring the UE to perform blind decoding, thereby reducing processing resource consumption.
3Reliability
If DCI is transmitted on PDCCH, then control information can be delivered, but cyclic redundancy check overhead is required
Solution Approach 1:
The patent merges DCI with downlink data into a single jointly encoded transmission on PDSCH. This combination eliminates the need for separate cyclic redundancy check overhead that would be required for independent DCI transmission on PDCCH, reducing overall transmission overhead while maintaining error detection capabilities through the unified coding structure.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may receive a capability indicator from a user equipment (UE) that indicates a capability of the UE to decode downlink control information (DCI) on a physical downlink shared channel (PDSCH). In some aspects, the base station may transmit, to the UE, the DCI on the PDSCH based at least in part on the capability indicator indicating that the UE can decode the DCI on the PDSCH. Numerous other aspects are provided.