Uplink Power Control via Individual PUCCH PHR Reporting

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Solution Overview

Problem

In LTE-A systems, the composite PUCCH/PUSCH Power Headroom Report (PHR) lacks sufficient information on PUCCH and PUSCH transmission power levels, leading to potential miss detection or detection errors, which affect uplink power control and interference management.

Innovation Solution

The method involves the UE reporting individual PUCCH PHRs on PUSCH in a reporting subframe for each PUCCH transmission, using a specific or dummy value when no further PUCCH transmission occurs, and including a PHR format indicator to distinguish between PUCCH and PUSCH PHRs, allowing for more accurate power control and scheduling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If composite PUCCH/PUSCH PHR is reported, then reporting complexity is reduced, but power information precision deteriorates

Engineering Contradiction:

Improvereporting complexityVSAvoidpower information precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent divides the composite PUCCH/PUSCH PHR into separate individual PHR reports for PUCCH and PUSCH. Instead of reporting a single composite value, the UE now generates and reports separate PHR measurements for PUCCH transmissions and PUSCH transmissions, allowing the network to obtain precise power information for each channel type independently.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If individual PUCCH PHR is reported for each PUCCH transmission, then power control accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improvepower control accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent combines multiple individual PUCCH PHR reports into a single PHR message that can include PHR information for multiple PUCCH transmissions. The network can configure the UE to report individual PUCCH PHRs for each PUCCH transmission in a first subframe, and these can be aggregated and reported together on PUSCH in a reporting subframe, reducing the number of separate signaling events.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements preliminary measurement and buffering of individual PUCCH PHR values for multiple PUCCH transmissions before reporting. The UE measures and stores the PHR for each PUCCH transmission in the first subframe, then reports them collectively in the reporting subframe when PUSCH is available, rather than reporting immediately after each PUCCH transmission.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If PHR format indicator is included, then detection accuracy is improved, but message size increases

Engineering Contradiction:

Improvedetection accuracyVSAvoidmessage size

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent introduces a PHR format indicator that provides localized differentiation within the PHR message. The indicator specifies whether the PHR report contains PUCCH PHR, PUSCH PHR, or both, allowing the network to efficiently interpret the message content based on the indicated format without requiring the entire message structure to be expanded for every possible case.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2996414B1Method of power information reporting for enhancing uplink power control

Publication Date: 2017.03.08 HTC CORP

AI summary

A method of power information reporting for enhancing uplink power control in a wireless communication system is disclosed. The method comprises reporting a physical uplink control channel (PUCCH) power headroom report (PHR) on a physical uplink shared channel (PUSCH) in a reporting subframe for each of at least one PUCCH transmission in a first subframe.