Communication Terminal Transmission Power Reporting

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Solution Overview

Problem

Conventional communication terminal apparatuses fail to accurately report transmission power, leading to inappropriate system operation, decreased throughput, and reduced efficiency due to inconsistent reporting of DPCCH transmission power across different environments and transmission modes.

Innovation Solution

A communication terminal apparatus configured with a transmission power setting section, a reporting section, and a transmitting section that sets and reports transmission power based on TPC commands, allowing for accurate communication quality assessment and scheduling by the base station.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If transmission power of DPCCH is increased temporarily for high-rate transmission or compressed mode, then channel estimation accuracy is improved, but transmission power reporting becomes inconsistent across different transmission modes

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidtransmission power reporting consistency

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent segments the transmission power control by introducing separate power offset parameters for different transmission modes: delta_Pilot for high-rate transmission and delta_Pilot_compressed for compressed mode. This segmentation allows each mode to have its own power adjustment mechanism, preventing mixing of different power conditions in the reported values.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter structure by introducing mode-specific power offset parameters (delta_Pilot and delta_Pilot_compressed) instead of using a single unified power offset. This parameter differentiation enables the system to track and report transmission power based on the actual TPC commands regardless of the transmission mode being used.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If different transmission power offsets are used for compressed mode and high-rate transmission, then each mode's specific requirements are met, but base station cannot accurately assess communication quality for scheduling

Engineering Contradiction:

Improvetransmission mode adaptabilityVSAvoidcommunication quality assessment accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent implements a feedback mechanism where the terminal reports transmission power values that are calculated to be consistent across different transmission modes. The base station uses this reported power information combined with received signal strength to accurately assess communication quality and make scheduling decisions, maintaining both mode adaptability and assessment accuracy.

Inventive Principle:

Principle #23Feedback

3Productivity

If transmission power is temporarily increased for pilot symbols in high-rate transmission, then data transmission rate is improved, but system operation becomes inappropriate due to inaccurate power reporting

Engineering Contradiction:

Improvedata transmission rateVSAvoidsystem operation appropriateness

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-defining separate power offset parameters (delta_Pilot and delta_Pilot_compressed) for different transmission modes before transmission occurs. This allows the system to anticipate and account for power variations due to compressed mode or high-rate transmission, ensuring that power reporting remains accurate and system operation remains appropriate even when transmission power is temporarily increased.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7620417B2Communication terminal apparatus, scheduling method, and transmission power deriving method

Publication Date: 2009.11.17 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

A communication terminal apparatus that can perform an appropriate system operation at the network side and also can avoid a reduction in throughput and a reduction in system efficiency. In this apparatus, a compressed mode calculating part (124) determines, based on compressed information and slot format information, a slot that is a gap in a frame of a compressed mode. A transmission power control part (125) establishes a transmission power obtained by increasing, by &Dgr; Pilot, the transmission power as designated and set by a TPC command for the slots other than the gap in the frame of the compressed mode. A DPCCH transmission power reporting part (127) outputs, to a channel encoding part (128), a report value indicative of the transmission power obtained by removing the effect of &Dgr; Pilot from the transmission power established by the transmission power control part (125).