Wireless Device PDCCH Search Space Determination for Rapid TRP Switching

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Solution Overview

Problem

In next-generation wireless communication systems, the rapid switching between multiple base stations due to user equipment mobility leads to inefficiencies in data transfer, as existing RRC signaling methods are inadequate for frequent TRP changes, affecting communication capacity and reliability.

Innovation Solution

A method where a wireless device determines a search space for detecting a physical downlink control channel (PDCCH) using a long device identifier, which includes a short device identifier, to reduce RRC signaling and facilitate rapid TRP switching, by employing a scheme that maintains device identifiers without alteration during TRP changes, allowing for efficient monitoring and switching between transmission/reception points.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If RRC signaling methods are used for base station switching, then device identifiers can be maintained, but frequent TRP changes cause signaling inefficiency and increased latency

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidswitching latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The device identifier is segmented into two parts: a long device identifier (first identifier) used for search space determination and a short device identifier (second identifier) used for PDCCH monitoring. This segmentation allows the system to maintain identifier consistency while enabling rapid TRP switching without full RRC signaling overhead.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The search space is determined in advance using the long device identifier before TRP switching occurs. This preliminary determination of the search space allows the wireless device to rapidly switch between TRPs without needing to perform complex identifier reconfiguration during the switching process.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If multiple base stations are deployed in narrow regions to increase data transfer efficiency, then communication capacity improves, but UE mobility between base stations increases switching frequency

Engineering Contradiction:

Improvedata transfer efficiencyVSAvoidswitching management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The long device identifier serves multiple functions: it is used for determining the search space, for identifying the wireless device during TRP switching, and for maintaining consistency across multiple base stations. This multi-functionality simplifies the switching management complexity while supporting high data transfer efficiency in dense base station deployments.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If frequent TRP switching is implemented to support UE mobility, then communication reliability improves, but RRC signaling overhead increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the identifier determination function from the full RRC signaling process. By using the long device identifier to pre-determine the search space and the short device identifier for PDCCH monitoring, the system removes the need for complete RRC signaling during frequent TRP switching, thereby reducing signaling overhead while maintaining reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP3454488B1Method and device for monitoring control channel

Publication Date: 2023.08.02 LG ELECTRONICS INC

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AI summary

Provided is a method and device for monitoring a control channel in a wireless communication system. The device determines a search space for detecting a physical downlink control channel (PDCCH) on the basis of a long device identifier. The device monitors the PDCCH in the search space on the basis of a short device identifier.