Blind Decoding Search Space Using Segmented DCI

Solution Overview

Problem

Conventional blind decoding techniques in LTE systems are inefficient, requiring excessive decoding operations and increasing latency and power consumption due to the need for duplicative decoding of DCI bits mapped to control channel elements within a search space, especially when dealing with variable DCI message lengths.

Innovation Solution

The technique splits a single DCI message into multiple element DCIs (eDCIs) that are independently encoded and linked, allowing for reuse of decoded eDCIs across different lengths, reducing the number of blind decodes required by a UE.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional blind decoding techniques are used to decode DCI messages in LTE systems, then complete DCI messages can be decoded, but excessive decoding operations are required leading to increased latency and power consumption

Engineering Contradiction:

ImproveDCI message decoding completenessVSAvoiddecoding latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The DCI message is segmented into multiple DCI parts, where each part can be independently decoded. The first DCI part contains sufficient information for initial decoding, while subsequent parts provide additional information. This segmentation allows the UE to perform fewer blind decoding operations by decoding only the necessary parts rather than attempting to decode complete DCI messages through multiple redundant operations.

Inventive Principle:

Principle #1Segmentation

2Reliability

If conventional blind decoding techniques are used to decode DCI messages in LTE systems, then complete DCI messages can be decoded, but excessive decoding operations are required leading to increased power consumption

Engineering Contradiction:

ImproveDCI message decoding completenessVSAvoidUE power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The DCI message is segmented into multiple DCI parts, where each part can be independently decoded. The first DCI part contains sufficient information for initial decoding, while subsequent parts provide additional information. This segmentation allows the UE to perform fewer blind decoding operations by decoding only the necessary parts rather than attempting to decode complete DCI messages through multiple redundant operations.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If DCI messages of variable lengths are decoded using conventional techniques, then all message formats can be supported, but duplicative decoding operations are required reducing efficiency

Engineering Contradiction:

ImproveDCI message format flexibilityVSAvoiddecoding efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The DCI message is segmented into multiple DCI parts, where each part can be independently decoded. The first DCI part contains sufficient information for initial decoding, while subsequent parts provide additional information. This segmentation allows the UE to perform fewer blind decoding operations by decoding only the necessary parts rather than attempting to decode complete DCI messages through multiple redundant operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adapts to different DCI message formats by using a standardized first DCI part followed by optional additional parts. This dynamic structure allows the same decoding approach to handle variable length messages efficiently, eliminating duplicative decoding operations while maintaining support for all message formats.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3535879B1Efficient blind decoding of a search space

Publication Date: 2024.10.23 QUALCOMM INC

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AI summary

Methods, systems, and devices for wireless communication are described for efficient blind decoding of a search space. A single DCI message may be divided and encoded into multiple element downlink control information (eDCI) components. Each eDCI may be independently encoded and thus independently decodable. A base eDCI may link to one or more associated extended eDCIs. A UE may identify a base eDCI corresponding to a radio network identifier associated with the UE, parse the base eDCI to obtain the base payload, determine the location of the one or more associated extended eDCIs based at least in part on the base eDCI, and parse the extended eDCI to obtain the one or more associated extended payloads. The UE may communicate based at least in part on a DCI message formed by combining the base payload and the one or more associated extended payloads.