PDCCH Detection via CRC Check to Reduce UE Battery Drain

Solution Overview

Problem

In wireless communication systems, particularly in next-generation mobile communication systems like LTE-A, UEs face challenges in efficiently detecting control information due to blind decoding methods, which increase battery consumption and reduce system performance, as each UE may require different control information and channel encoding schemes.

Innovation Solution

A method and apparatus for a UE to detect a physical downlink control channel (PDCCH) in a first subframe and receive data in subsequent subframes based on the control information, using subframe information that includes the number and offset of these subframes, allowing for efficient data reception and reducing unnecessary detection attempts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If blind decoding is used to detect control information from multiplexed control channels, then control information detection capability is improved, but battery consumption increases and detection speed decreases

Engineering Contradiction:

Improvecontrol information detection capabilityVSAvoidbattery consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by performing CRC checking as a first step before full blind decoding. The UE checks the CRC of received control information using its unique identifier (RNTI) to determine if the control information is intended for this UE. This preliminary verification filters out irrelevant control information early, reducing the number of full blind decoding attempts needed and thereby lowering battery consumption while maintaining reliable detection capability.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If blind decoding is used to detect control information from multiplexed control channels, then control information detection capability is improved, but detection speed decreases

Engineering Contradiction:

Improvecontrol information detection capabilityVSAvoiddetection speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent applies preliminary action by performing CRC checking as a first step before full blind decoding. The UE checks the CRC of received control information using its unique identifier (RNTI) to determine if the control information is intended for this UE. This preliminary verification filters out irrelevant control information early, reducing the number of full blind decoding attempts needed and thereby lowering battery consumption while maintaining reliable detection capability.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If control information for multiple UEs is multiplexed in one transmission interval, then system capacity is improved, but detection complexity increases

Engineering Contradiction:

Improvesystem capacityVSAvoiddetection complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by using UE-specific identifiers (RNTIs) to locally differentiate control information intended for each UE within the multiplexed control channel. Each UE can locally verify whether received control information is relevant to itself by checking if the RNTI matches, thereby simplifying detection complexity for individual UEs while maintaining high system capacity through multiplexing.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8824366B2Method and apparatus of receiving data in wireless communication system

Publication Date: 2014.09.02 LG ELECTRONICS INC

AI summary

A method and an apparatus of receiving data in a wireless communication system are provided. The method includes detecting a physical downlink control channel (PDCCH) on which control information is transmitted in a first subframe, and receiving data in at least one second subframe based on the control information.