Uplink Transmission Power Control via TPC Command Reset

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Solution Overview

Problem

Current methods for transmission power control in New Radio (NR) are inefficient, particularly in resetting the closed loop correction value, leading to degraded performance due to increased interfering power and longer convergence times.

Innovation Solution

A terminal and base station configuration that uses transmission power control information to dynamically reset the closed loop correction value, associating reset instruction information with candidate values in the TPC command table, allowing for efficient control of transmission power without increasing control information overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the closed loop correction value is reset using conventional TPC methods, then transmission power control is maintained, but convergence time increases and interfering power increases

Engineering Contradiction:

Improvetransmission power control performanceVSAvoidconvergence time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring the TPC command table with specific candidate values that correspond to reset instructions. When the base station needs to reset the closed loop correction value, it directly selects the pre-associated candidate value from the TPC command table, eliminating the need for separate reset signaling and enabling immediate convergence to optimal transmission power.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If reset instruction information is added to TPC commands, then closed loop control resetting is improved, but control information overhead increases

Engineering Contradiction:

Improveclosed loop control resettingVSAvoidcontrol information overhead

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The patent applies universality by designing the TPC command table such that candidate values serve dual purposes: they indicate both transmission power adjustments and closed loop correction value reset instructions. The base station configures the TPC command table with candidate values where at least one value is associated with a reset instruction, allowing the same TPC command structure to perform multiple functions without increasing overhead.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the reset instruction function with the existing TPC command structure by associating reset instructions with candidate values in the TPC command table. This integration allows the base station to convey both power control adjustments and reset instructions through the same signaling mechanism, eliminating the need for separate reset signaling and maintaining efficient use of control resources.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11191030B2Terminal, base station, transmission method, and reception method

Publication Date: 2021.11.30 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

In a terminal, a transmission power control unit controls the transmission power of an uplink channel (the PUSCH) by using transmission power control information (a TPC command) indicating one from among a plurality of candidate values. A wireless transmission unit transmits the uplink channel with the above transmission power. Instruction information for resetting a control value (closed loop correction value) to be used in a closed loop control of the transmission power is associated with at least one value among the above plurality of candidate values.