Wireless Device TPC Command Loop Identification
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Solution Overview
Problem
Existing wireless communication systems face complexity in managing multiple closed loops for power control, particularly in identifying the correct loop for transmit power control commands in scenarios with multiple wireless devices and different types of transmissions, leading to inefficiencies and increased overhead.
Innovation Solution
The implementation of a method in wireless devices and network nodes to determine the appropriate closed loop for transmit power control commands using DCI CRC and explicit closed loop indication bits, allowing for explicit indication of the loop to apply the TPC command, thereby simplifying the association of commands with the correct power control configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple closed loops are configured for different channels and transmission types, then power control adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the power control mechanism by introducing separate closed loops for different channels (PUCCH, PUSCH, SRS) and transmission types (grant-based, grant-free). Each closed loop maintains independent power control parameters and adjustment states, allowing differentiated power control strategies for different transmission scenarios while keeping the overall system manageable through structured segmentation.
Solution Approach 2:
The patent adds a new dimension to power control by introducing a closed loop indicator in DCI messages. This indicator dimension enables the network to explicitly specify which closed loop should be applied for each TPC command, transforming the power control from a single-dimension approach to a multi-dimensional framework that accommodates multiple closed loops without proportionally increasing complexity.
2Productivity
If TPC commands are sent for multiple wireless devices in one PDCCH, then signaling efficiency is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent segments the group TPC command structure by allocating specific bit field positions to different wireless devices. Each device is assigned a unique position range within the DCI message where its TPC command and closed loop indicator are located. This segmentation allows multiple devices to be served efficiently in a single PDCCH while enabling each device to easily locate and detect its specific command without interference from others.
Solution Approach 2:
The patent introduces closed loop indicator bits as an intermediary element that mediates between the network's power control intentions and the wireless device's power adjustment actions. These indicator bits serve as a mapping key that connects the TPC command value to the specific closed loop configuration, enabling accurate detection and application of the correct power control parameters even in group-addressed scenarios.
Data Source
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AI summary
According to certain embodiments, a method is performed by a wireless device configured with multiple power control closed loops for a serving cell. The method comprises receiving a transmit power control (TPC) command in a downlink control message that comprises a plurality of TPC commands. The method comprises determining a particular power control closed loop of the plurality of power control closed loops to which the TPC command should be applied. The particular power control closed loop is determined using the downlink control message. The method further comprises updating the particular power control closed loop using the TPC command.