Shared-Channel DCI Piggybacking for Lower UE Decoding Load
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-frequency wireless communications systems, increased search space monitoring and blind decoding of downlink control information (DCI) result in excessive computational complexity and power consumption for user equipment (UEs).
Innovation Solution
Implementing 'piggyback' DCI, where downlink data transmissions are multiplexed with additional DCI, allowing for dynamic switching between low density parity check (LDPC) and polar encoding schemes based on payload size thresholds to optimize coding gain and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional separate DCI transmission is used, then control information is transmitted reliably, but computational complexity and power consumption at UEs increase excessively
Solution Approach 1:
The patent combines DCI components with downlink shared data into a single multiplexed transmission on the downlink shared channel. This merging eliminates the need for separate DCI transmission and reduces the number of blind decoding operations UEs must perform, thereby reducing computational complexity while maintaining reliable control information delivery through the integrated channel structure
Solution Approach 2:
The downlink shared channel is designed to serve dual purposes: transmitting both downlink shared data and DCI components simultaneously. This multi-functionality allows the same physical channel to carry both control and user plane information, reducing overall system complexity and UE processing burden while maintaining the reliability of control information transmission
2Reliability
If LDPC encoding is used for large payload sizes, then coding gain is optimized, but if polar encoding is used for small payload sizes, then complexity is reduced
Solution Approach 1:
The patent implements dynamic encoding scheme selection based on the aggregated payload size of DCI components. When the payload exceeds a threshold, LDPC encoding is applied for superior coding gain; when below the threshold, polar encoding is used for lower complexity. This dynamic adaptation optimizes the trade-off between reliability and complexity for different payload conditions
Solution Approach 2:
The patent changes the encoding parameter (encoding scheme type) based on the payload size parameter. By monitoring the aggregated DCI component size and adjusting the encoding approach accordingly, the system adapts to different transmission conditions, selecting the most appropriate encoding method to balance performance and complexity requirements
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A network entity may switch between low density parity check (LDPC) and polar encoding schemes depending on the payload size of the DCI components and how the DCI components are bundled (i.e., jointly or separately). The switching between LDPC and polar encoding schemes may be based on a payload size threshold. This threshold may be hard coded or it may be semi-statically configured using radio resource control (RRC) signaling.