Uplink Power Control via Segmented TPC Commands

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Solution Overview

Problem

In communication systems like WCDMA and LTE, accurately setting uplink transmission power is challenging, especially in cooperative communication scenarios such as CoMP schemes, which affects overall system throughput.

Innovation Solution

A terminal is equipped with a reception unit that demodulates and processes transmission power control commands within downlink control information formats to obtain power correction values, enabling dynamic uplink transmission power configuration based on different states and channel conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the base station provides only a single TPC command in DCI format, then the device complexity is reduced, but the adaptability of uplink transmission power control deteriorates

Engineering Contradiction:

Improvecontrol signal structureVSAvoiduplink transmission power control adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The TPC command field in DCI format is segmented into multiple independent TPC commands (first TPC command and second TPC command). Each TPC command can independently control different uplink channels or signals, enabling fine-grained power control without requiring complex external signaling mechanisms.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The DCI format is designed with multi-functionality by incorporating multiple TPC commands within a single control message. This universal structure allows the same DCI format to control various uplink transmissions (PUSCH, PUCCH, SRS) with different power requirements, eliminating the need for separate control messages for each channel.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the base station provides multiple TPC commands in DCI format, then the adaptability of uplink transmission power control is improved, but the device complexity increases

Engineering Contradiction:

Improveuplink transmission power control adaptabilityVSAvoidcontrol signal structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple TPC commands are merged into a single DCI format message. Instead of transmitting separate control messages for each power control command, the invention combines multiple TPC commands within one DCI structure, reducing the number of signaling transactions and simplifying the overall control signal architecture.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The DCI format dynamically adapts its content based on current transmission requirements. The presence and values of multiple TPC commands within the DCI format can be adjusted according to the specific uplink transmission scenario, providing flexible power control without requiring a fixed complex structure.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If the terminal uses fixed uplink transmission power, then the device complexity is reduced, but the productivity of the communication system deteriorates

Engineering Contradiction:

Improvepower control mechanismVSAvoidsystem throughput

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The system implements feedback-based power control where the base station receives uplink transmission information from the terminal and sends back TPC commands in DCI format. This feedback loop allows the terminal to adjust its transmission power dynamically based on actual channel conditions and base station requirements, optimizing system throughput without requiring complex local decision-making at the terminal.

Inventive Principle:

Principle #23Feedback

4Productivity

If the terminal dynamically adjusts uplink transmission power, then the productivity of the communication system is improved, but the device complexity increases

Engineering Contradiction:

Improvesystem throughputVSAvoidpower control mechanism

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The terminal autonomously adjusts its uplink transmission power by processing the received TPC commands from the base station. The terminal's power control unit automatically interprets the TPC commands and applies the appropriate power corrections to different uplink channels without requiring complex external coordination or manual intervention, achieving efficient power control with minimal additional complexity.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9832732B2Terminal, base station, and communication method which set a transmission power of an uplink signal

Publication Date: 2017.11.28 SHARP KK

AI summary

In a communication system in which a base station and a terminal communicates, the base station and the terminal communicates efficiently. There is provided the terminal which communicates with the base station, the terminal including: a reception unit 605 which detects a transmission power control (TPC) command in a downlink control information (DCI) format and obtains a power correction value from the TPC command; and a transmission power control unit 6015 which sets transmission power of an uplink signal based on a power correction value obtained from a first TPC command when the terminal is in a first state and sets transmission power of the uplink signal based on a power correction value obtained from a second TPC command when the terminal is in a second state.