Power Control for Additional SRS Using DCI Format 3B
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Solution Overview
Problem
Existing methods for determining transmit power for additional SRS in wireless communications lack effective solutions for various scenarios, particularly when additional SRS and legacy SRS are transmitted together or without PUSCH/PUCCH, leading to inefficiencies in power control.
Innovation Solution
The proposed methods involve transmitting power control parameters and TPC commands using DCI format 3B, with additional fields and scrambling IDs configured by higher layers, to determine the transmit power for additional SRS, ensuring optimal power control in different transmission scenarios, including when additional SRS and legacy SRS are transmitted together or without PUSCH/PUCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If additional SRS and legacy SRS are transmitted in the same subframe without PUSCH/PUCCH, then SRS capacity is improved, but power control complexity increases due to lack of effective methods for determining transmit power
Solution Approach 1:
The patent segments the power control mechanism by introducing separate TPC commands in DCI format 3B for additional SRS and legacy SRS. This allows independent power control for each SRS type, resolving the complexity issue while maintaining enhanced SRS capacity. The segmentation enables the system to handle multiple SRS transmissions without creating a monolithic power control problem.
Solution Approach 2:
The patent implements dynamic power control through TPC commands that can be adjusted in real-time via DCI format 3B. The transmit power for additional SRS is dynamically determined based on received TPC commands, allowing the system to adapt power allocation to current channel conditions and traffic requirements, thus managing complexity through dynamic adjustment rather than static configuration.
2Measurement precision
If TPC command is transmitted by DCI format 3B with additional fields, then power control precision is improved, but message format complexity increases
Solution Approach 1:
The patent makes DCI format 3B multi-functional by configuring it to carry TPC commands for both additional SRS and legacy SRS using the same message structure. The universal DCI format 3B can be scrambled by different RNTIs or contain different TPC fields depending on configuration, achieving precise power control without creating entirely separate message formats for each SRS type.
Solution Approach 2:
The patent achieves power control precision by changing parameters within the existing DCI format 3B structure rather than creating a completely new format. By configuring TPC commands with specific power offset values and using different scrambling IDs or field positions, the system achieves precise power control while maintaining message format simplicity through parameter adjustment rather than structural redesign.
3Productivity
If transmit power for additional SRS is determined independently, then power allocation efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback-based power allocation where the base station sends TPC commands in DCI format 3B that reflect current channel conditions and power allocation requirements. The UE uses these feedback commands to determine transmit power for additional SRS, achieving efficient power allocation through closed-loop control rather than open-loop independent determination, thus managing complexity through intelligent feedback mechanisms.
Data Source
AI summary
Methods and apparatuses of power control for additional SRS are disclosed. A method at abase unit comprises transmitting power control parameters for transmitting additional SRS by higher layers; and transmitting TPC command by DCI format 3B for additional SRS.