PDCCH Subsets for UE Battery Conservation

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Solution Overview

Problem

In Evolved UTRAN (E-UTRAN) telecommunication systems, user equipment (UE) must decode the entire set of possible PDCCHs, wasting limited battery power and reducing standby time, as they lack knowledge of the specific PDCCH locations.

Innovation Solution

Divide the PDCCH space into a common subset and group subsets, allowing each UE to decode only the relevant group subset, thereby reducing the number of PDCCHs that need to be decoded.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UEs decode the entire set of possible PDCCHs to ensure detection of assignments directed to them, then reliability of assignment detection is improved, but energy consumption increases and standby time decreases

Engineering Contradiction:

Improveassignment detection reliabilityVSAvoidUE battery power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The PDCCH space is segmented into multiple search spaces (common search space and user-specific search spaces). Each UE is configured to monitor only specific search spaces relevant to it, rather than decoding all possible PDCCHs. This segmentation reduces the number of PDCCH candidates a UE must decode while ensuring that all assignments directed to that UE are still captured within its monitored search spaces.

Inventive Principle:

Principle #1Segmentation

2Reliability

If UEs decode the entire set of possible PDCCHs to ensure detection of assignments directed to them, then reliability of assignment detection is improved, but standby time decreases

Engineering Contradiction:

Improveassignment detection reliabilityVSAvoidUE standby time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Use of energy by moving object

If the PDCCH space is divided into common subset and group subsets, then energy consumption is reduced and standby time is improved, but system complexity increases

Engineering Contradiction:

ImproveUE battery power consumptionVSAvoidPDCCH space organization complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Search space configurations act as an intermediary layer between the network and UEs. The network configures search spaces that organize PDCCH candidates, and UEs use these configurations to efficiently identify which PDCCHs to monitor. This intermediary structure simplifies the complexity by providing a systematic organization rather than requiring UEs to handle the entire PDCCH space directly.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Use of energy by moving object

If the PDCCH space is divided into common subset and group subsets, then energy consumption is reduced and standby time is improved, but device complexity increases

Engineering Contradiction:

ImproveUE battery power consumptionVSAvoidPDCCH monitoring operation

Core Design Contradiction:

Use of energy by moving objectVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11432281B2Method and arrangement in a telecommunication system

Publication Date: 2022.08.30 OPTIS WIRELESS TECHNOLOGY LLC

AI summary

The downlink control channels in a control region of each downlink subframe in a telecommunication system are divided into at least one common subset of the downlink control channels and a plurality of group subsets of the downlink control channels, such that the common subset or each common subset will be decoded by every user equipment, and each group subset will be decoded only by a limited group of user equipments. Resource assignment messages for a user equipment can then be transmitted on a downlink control channel of the relevant group subset, to avoid the need for messages to be decoded by a large number of UEs that will not act on them, while broadcast messages can be transmitted on a downlink control channel of the relevant common subset, to avoid the need for messages to be transmitted many times.