Uplink Power Control via PDCCH Repetition Window Selection
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Solution Overview
Problem
In mobile communication systems, when the Physical Downlink Control Channel (PDCCH) used for scheduling uplink signals is repeatedly transmitted, terminal devices cannot determine the effective Transmit Power Control (TPC) command window, leading to inaccurate closed-loop power control.
Innovation Solution
The method involves determining an effective TPC command window based on a preset PDCCH within a plurality of repeatedly transmitted PDCCHs, where the preset PDCCH is either the headmost or the last PDCCH. This allows for accurate determination of the transmit power of uplink signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH is repeatedly transmitted to improve scheduling reliability, then reliability of uplink signal scheduling is improved, but terminal device cannot determine the effective TPC command window leading to reduced power control accuracy
Solution Approach 1:
The patent applies preliminary action by pre-defining selection rules for determining the effective TPC command window based on PDCCH repetition scenarios. The terminal device is configured with specific criteria (such as selecting based on DCI format, RNTI type, or time domain position) that are established in advance through RRC signaling or system information, enabling the terminal to autonomously and accurately identify the effective TPC command window without ambiguity even when PDCCH is repeatedly transmitted.
Solution Approach 2:
The patent introduces an intermediary mechanism through the network device's configuration signaling that provides selection criteria or direct indication for identifying the effective TPC command window. This intermediary information (configured via RRC signaling, system information, or downlink control information) acts as a mediator between the repeated PDCCH transmissions and the terminal's power control determination, resolving the ambiguity and ensuring accurate power control.
2Reliability
If PDCCH repetition is used to enhance control channel reliability, then system robustness is improved, but complexity of determining effective TPC command window increases
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine the effective TPC command window using pre-configured selection rules. The terminal independently evaluates the received repeated PDCCHs according to the configured criteria (such as DCI format matching, RNTI type, or time domain position) and selects the appropriate TPC command window without requiring additional complex network coordination or real-time signaling, thereby reducing overall system complexity while maintaining reliability.
Data Source
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AI summary
Embodiments of the present application provide a power control method and apparatus. The method comprises: determining an effective transmit power control (TPC) command window according to a preset physical downlink control channel (PDCCH) in a plurality of PDCCHs that are repeatedly transmitted, the preset PDCCH comprising the first PDCCH or the last PDCCH in the plurality of PDCCHs; determining a closed-loop power adjustment state according to a TPC command in the effective TPC command window; and according to the closed-loop power adjustment state, determining the transmit power of an uplink signal of a terminal device. When PDCCHs for scheduling uplink signals are repeatedly transmitted, a preset PDCCH may be determined from the plurality of PDCCHs that are repeatedly transmitted, the preset PDCCH may be the first and/or the last one of the plurality of PDCCHs that are repeatedly transmitted, then an effective TPC command window is determined according to the preset PDCCH, so that the problem that a terminal device cannot determine an effective TPC command window can be avoided, then the transmit power of an uplink signal is controlled according to the effective TPC command window, and thus the accuracy of closed-loop power control can be effectively ensured.