Uplink MIMO Power Control via DCI Indication for Partial Coherence
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Solution Overview
Problem
Current uplink multiple input multiple output (MIMO) power allocation mechanisms in 3GPP new radio (NR) systems cannot ensure that user equipment (UE) with partial antenna coherent and non-coherent transmission capabilities send uplink signals using different power control policies and/or transmission modes based on channel state, resulting in poor transmission performance.
Innovation Solution
A signal transmission method where a network device determines a first indication message to instruct a UE to use a specific power control policy and/or transmission mode for sending a signal, which is carried in a predefined field of downlink control information (DCI), allowing the UE to adjust its power allocation and transmission mode accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE always sends uplink signals using a precoding matrix indicated by a base station through TPMI, then the UE uses the same uplink power control policy and transmission mode, but the UE cannot control the sending power using other power control policies and transmission modes, resulting in poor transmission performance
Solution Approach 1:
The patent applies dynamics by enabling the UE to dynamically switch between different power control policies and transmission modes based on channel conditions. The network device configures multiple power control policies and transmission modes, and the UE selects the appropriate combination adaptively, transforming a static single-policy system into a dynamic multi-policy system that can respond to changing channel states.
Solution Approach 2:
The patent implements parameter changes by allowing the UE to adjust power control parameters (such as power control policy type, transmission mode, and power allocation coefficients) based on channel quality indicators. The network device provides configuration information including multiple power control policies with different parameters, and the UE modifies these parameters adaptively to optimize transmission performance under different channel conditions.
2Power
If a UE with partial antenna coherent and non-coherent transmission capabilities uses current uplink MIMO power allocation mechanism, then the UE cannot send uplink signals with full power, but enabling full power transmission requires a definite control mechanism
Solution Approach 1:
The patent applies feedback by implementing a closed-loop control mechanism where the network device monitors channel quality and UE transmission status, then provides feedback through DCI to adjust the UE's power control policy and transmission mode. This feedback loop enables the system to achieve full power transmission when conditions permit while maintaining simplicity through centralized network control rather than complex UE-side decision-making.
Solution Approach 2:
The network device acts as an intermediary that manages the complexity of full power transmission control. Instead of requiring complex UE-side mechanisms to determine when and how to transmit at full power, the network device receives channel state information, makes the determination centrally, and instructs the UE through configured power control policies and transmission modes, thereby simplifying the overall control architecture.
3Reliability
If the first field in DCI is used to indicate different power control policies and transmission modes, then the UE can be controlled to send signals with full power, but the field requires at least two bits and occupies signaling resources
Solution Approach 1:
The patent applies universality by designing the first field in DCI to serve multiple functions simultaneously. The same field not only indicates power control policies but also conveys transmission mode information and, in some embodiments, precoding matrix indicator (PMI) information. This multi-functional design allows the system to achieve full power transmission control while minimizing signaling overhead by packing multiple control dimensions into a single field.
Solution Approach 2:
The patent merges multiple control functions into the first field of DCI. By combining power control policy indication, transmission mode specification, and potentially PMI information into a single unified field, the patent reduces the total signaling overhead compared to using separate fields for each function. This merging approach maintains the ability to control full power transmission while optimizing resource utilization.
Data Source
AI summary
Disclosed in the present application are a signal transmission method, a network device and a UE, the method comprising: a network device determining a first instruction message, the first instruction message instructing a UE to use a first power control policy and/or a first transmission mode to send a first signal; and the network device sending the first instruction message to the UE. The problem in the prior art in which a UE cannot be controlled to use full power to send an uplink signal is solved.