Transmission Power Control for Dynamic TDD Wireless Systems
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Solution Overview
Problem
The existing wireless communication systems, particularly in LTE, lack specific procedures for transmission power control, leading to inefficiencies in processing related to transmission power management.
Innovation Solution
A terminal device and base station apparatus are equipped with a transmission power control unit that determines and adjusts parameters for PUCCH and PUSCH transmission power based on received DCI formats, utilizing UL-DL configurations to set and maintain optimal power levels across subframes, ensuring efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traffic adaptation technique (dynamic TDD) is applied to change the ratio between uplink resources and downlink resources depending on traffic, then communication efficiency is improved, but processing complexity for transmission power control increases due to lack of specific procedures
Solution Approach 1:
The patent segments transmission power control into two distinct parameters: first parameter for PUCCH transmission power and second parameter for PUSCH transmission power. Each parameter is controlled independently through separate TPC commands received in DCI formats, allowing simplified individual processing while achieving efficient overall power management in dynamic TDD systems.
Solution Approach 2:
The patent establishes preliminary procedures for determining transmission power parameters before actual transmission occurs. The terminal device pre-determines the first parameter based on TPC commands in received DCI formats and pre-determines the second parameter similarly, ensuring that power control decisions are made in advance according to configured rules rather than during transmission processing.
2Adaptability or versatility
If flexible subframes are used to allow dynamic uplink/downlink configuration, then adaptability is improved, but transmission power control becomes ambiguous without specific procedures
Solution Approach 1:
The patent changes the operational parameters by introducing distinct first and second parameters for PUCCH and PUSCH transmission power respectively. These parameters are dynamically adjusted based on TPC commands received in DCI formats, providing clear operational rules for flexible subframes where the uplink/downlink configuration can change, thereby maintaining operational clarity despite configuration flexibility.
3Measurement precision
If separate TPC commands are used for PUCCH and PUSCH power control, then power management precision is improved, but processing overhead increases
Solution Approach 1:
The patent merges the transmission power control functionality into a unified mechanism where both first parameter (PUCCH power) and second parameter (PUSCH power) are controlled through TPC commands embedded in DCI formats that are already present in the system for scheduling purposes. This combining approach achieves precise separate power control without adding significant processing overhead, as the TPC commands are integrated into existing control signaling.
Data Source
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AI summary
A value of a first parameter in a subframe n is determined based on a TPC command for a PUCCH received in a subframe (n-KPUCCH). A value of a second parameter in the subframe n is determined based on a TPC command for a PUSCH received in a subframe (n-KPUSCH). A value of KPUCCH is specified based on a first UL-DL configuration. A value of KPUSCH is specified based on a second UL-DL configuration. The value of the first parameter for a subframe i of which an instruction as an uplink subframe is not performed by the first UL-DL configuration is set to the value of the first parameter for a subframe (i-1). The value of the second parameter for a subframe k of which an instruction as an uplink subframe is not performed by the second UL-DL configuration is set to the value of the second parameter for a subframe (k-1).