PUCCH Power Control via DCI Format 3/3A Intermediary
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Solution Overview
Problem
In LTE systems, user equipment cannot perform accurate Physical Uplink Control Channel (PUCCH) power control when information in the Transmit Power Control (TPC) field indicates a non-TPC command, leading to degraded power control accuracy.
Innovation Solution
A method and apparatus that determine whether the TPC field in the Downlink Control Information (DCI) format contains a non-TPC command, and perform PUCCH power control using a TPC command in a second DCI format when a non-TPC command is indicated, or set an adjustment value of zero when no second DCI format is received, to enable accurate power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the TPC field in DCI format is reused to indicate non-TPC command (such as PUCCH resource indication), then the PDCCH overhead is reduced, but the user equipment cannot perform PUCCH power control and the accuracy of PUCCH power is degraded
Solution Approach 1:
The patent introduces a new DCI format (DCI format 3/3A) as an intermediary carrier to transmit TPC commands separately. When the TPC field in other DCI formats is reused for non-TPC purposes, this dedicated DCI format 3/3A serves as the mediator to deliver the power control information that would otherwise be lost, thereby resolving the contradiction between reducing overhead and maintaining power control accuracy.
Solution Approach 2:
The patent segments the power control information transmission by separating it from the main data scheduling DCI formats. TPC commands are transmitted in dedicated DCI format 3/3A messages, while other DCI formats can freely reuse their TPC fields for resource indication purposes. This segmentation allows each component to fulfill its specific function without compromising the other.
2Productivity
If the TPC field is used to indicate PUCCH resource indication information, then the information transmission efficiency is improved, but the user equipment cannot obtain power control information
Solution Approach 1:
DCI format 3/3A acts as an intermediary message specifically designed to carry TPC commands when they are omitted from other DCI formats. This intermediary ensures that power control information is not lost even when the TPC field is repurposed in scheduling DCI messages for resource indication.
Solution Approach 2:
The patent changes the parameter usage in DCI formats based on the Downlink Assignment Index (DAI) value. When DAI ≠ 1, the TPC field parameter is reinterpreted as resource indication information. In response, the system adjusts by transmitting TPC commands in DCI format 3/3A, thereby adapting the information transmission parameters to maintain both efficiency and completeness.
3Device complexity
If the user equipment does not receive second DCI format, then the system operation is simplified, but the PUCCH power adjustment value must be set to zero which degrades power control accuracy
Solution Approach 1:
The patent applies preliminary action by having the network proactively send DCI format 3/3A containing TPC commands in advance, ensuring that power control information is available even when scheduling DCI formats do not include TPC fields. This preliminary transmission of power control information prevents the need to set adjustment values to zero, maintaining accuracy while keeping system operation relatively simple.
Data Source
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AI summary
An embodiment of the present invention relates to the technical field of wireless communication. Disclosed are a transmit power control and power control method, system and device for solving the problem of user equipment unable to control the power of a PDCCH when reusing a TPC command, thus decreasing the PDCCH power accuracy. The method in the embodiment of the present invention comprises: determining whether the TPC domain in a first DCI format information is a non-TPC command after a user equipment receiving the first DCI format information; when the TCP domain of the first DCI format information received by the user equipment is a non-TPC command, and after receiving a second DCI format information in the downlink sub-frame receiving the first DCI format information, using the TPC command in the second DCI format information to control the PUCCH power. Employing the method of the present invention can improve the PUCCH power accuracy and the performance of the user equipment.