DCI Power Control for Reliable Grant-Free Uplink Transmission
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Solution Overview
Problem
Current wireless communication systems lack effective mechanisms for indicating uplink power control in grant-free transmissions, leading to performance degradation due to preemptive transmissions by higher-priority services, especially in 4G and 5G networks, where low-latency and high-reliability services are compromised by overlapping lower-priority services.
Innovation Solution
Implementing a power control scheme using downlink control information (DCI) to dynamically adjust transmit power and indicate resource occupation status, integrating grant-free and grant-based uplink transmissions, with specific formats for power control parameters and resource indication fields to enhance transmission reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If grant-free uplink transmission is used to reduce latency, then transmission speed is improved, but transmission reliability deteriorates due to preemptive transmissions by higher-priority services
Solution Approach 1:
The patent implements dynamic power adjustment mechanisms where the transmission power for grant-free uplink services is adaptively increased when resource occupation is detected. The base station monitors resource usage and sends power adjustment indications to user equipment, enabling the system to dynamically switch between low-power normal operation and high-power reliable transmission modes based on real-time resource conditions.
Solution Approach 2:
The patent changes the power control parameters dynamically based on resource occupation status. When a higher-priority service occupies the granted resources, the system adjusts the transmit power parameter upward to overcome interference and maintain reliable transmission. This parameter adaptation allows the system to maintain both speed and reliability under varying channel conditions.
2Reliability
If transmission power is increased to improve reliability, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The system employs dynamic power control where transmission power is adjusted in real-time based on resource occupation detection. Power is increased only when and where higher-priority services occupy granted resources, rather than maintaining high power continuously. This dynamic adjustment ensures reliability improvement only when necessary, minimizing unnecessary energy consumption during normal non-occupied transmission periods.
Solution Approach 2:
The patent applies power adjustment locally to specific time-frequency resources rather than uniformly across all transmissions. When resource occupation is detected in particular resource blocks, power enhancement is applied only to those affected resources, leaving other resources to operate at normal power levels. This localized approach improves reliability where needed while conserving energy in unaffected transmission regions.
3Reliability
If resource occupation indication is implemented to protect high-reliability services, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The base station acts as an intermediary that monitors resource occupation by higher-priority services and communicates this information to user equipment through downlink control information. This intermediary approach centralizes the complexity of resource monitoring and management at the base station, while user equipment receives simplified indications and adjusts power accordingly, reducing the complexity burden on mobile devices.
Solution Approach 2:
The system implements a feedback mechanism where the base station monitors uplink resource usage, detects occupation by higher-priority services, and sends power adjustment indications back to user equipment. This closed-loop feedback enables automatic adaptation to resource conditions without requiring complex local decision-making at the user equipment, simplifying device complexity while maintaining reliability through continuous monitoring and adjustment.
Data Source
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AI summary
Methods, systems, and devices related to digital wireless communication are described. An illustrative method of wireless communication includes indicating, by a communication device, power control information based on a plurality of parameter sets via downlink control information (DCI). The power control information is used for indicating transmission power on a resource, and the plurality of parameter sets are predefined for the resource.