Communication Device Subcarrier Selection for Control Information Reduction

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Solution Overview

Problem

Conventional communication terminal apparatuses face issues with increased uplink control information and current consumption due to the need to report channel quality for all subcarriers during frequency scheduling, leading to interference and higher power usage, especially when resource control considers delay requirements.

Innovation Solution

A communication apparatus with a subcarrier selection section, channel quality measurement section, and report section that only measures and reports channel quality for subcarriers selected by the base station, reducing unnecessary control information and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If communication terminal apparatuses report channel quality information for all subcarriers during frequency scheduling, then the base station can perform accurate frequency scheduling, but the amount of uplink control information increases and interference with other traffic increases

Engineering Contradiction:

Improvechannel quality measurement accuracyVSAvoidamount of control information

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The invention extracts only the necessary channel quality information for selected subcarriers rather than reporting all subcarrier channel qualities. The base station selects specific subcarriers and the terminal apparatus reports channel quality only for those selected subcarriers, removing unnecessary control information while maintaining scheduling accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention segments the channel quality reporting process by dividing subcarriers into selected and non-selected groups. Only the selected subcarriers (a subset of all subcarriers) require channel quality reporting, creating a segmented approach that reduces overall control information volume while preserving essential scheduling data.

Inventive Principle:

Principle #1Segmentation

2Loss of information

If communication terminal apparatuses measure channel quality for all subcarriers, then complete channel state information is available, but current consumption increases due to signal processing for monitoring the channel

Engineering Contradiction:

Improvechannel state information completenessVSAvoidcurrent consumption

Core Design Contradiction:

Loss of informationVSUse of energy by moving object

Solution Approach 1:

The invention extracts only the essential channel quality measurements for selected subcarriers rather than measuring all subcarriers. This extraction approach maintains sufficient channel state information for effective frequency scheduling while significantly reducing the signal processing workload and current consumption at the terminal apparatus.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If users with delay-tolerant data continue to transmit control information like users with strict delay requirements, then channel quality information is continuously available, but interference due to control information transmission increases

Engineering Contradiction:

Improvechannel quality information availabilityVSAvoidinterference from control information

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention introduces dynamic control information transmission where the terminal apparatus transmits channel quality reports only when subcarriers are selected for data transmission. This dynamic approach adapts the reporting frequency to actual scheduling needs, maintaining reliability when necessary while reducing interference during periods when no data is scheduled.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If resource control allocates subcarriers based on delay requirements, then QoS requirements are met, but users with lower priority continue to report channel quality for all subcarriers increasing current consumption

Engineering Contradiction:

Improvedelay requirement accommodationVSAvoidcurrent consumption for channel monitoring

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The invention applies local quality by differentiating the channel quality reporting requirement based on user priority and scheduling status. High-priority users with strict delay requirements maintain comprehensive reporting, while lower-priority users with delay-tolerant data report only for selected subcarriers or not at all, creating localized quality levels matched to actual needs.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS7996014B2Communication device and scheduling method

Publication Date: 2011.08.09 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

A communication device which can reduce amount of control information, limit interference with other traffics, and prevent an increase in current consumption. In this device, a separation unit (105) separates radio resource allocation information, specific section information and transmission parameter information from a received signal. A specific section information control unit (106) selects a sub-carrier designated by the specific section information to allocate data to be transmitted to the own unit. A channel quality measuring unit (107) uses a pilot signal to measure the channel quality of the selected sub-carrier. A channel quality information creating unit (108) creates channel quality information indicating the measurement results input from the channel quality measuring unit (107). A multiplexing unit (109) multiplexes the transmission signal with the channel quality information.