Grant-Free Uplink Power Control for Wireless Access
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Solution Overview
Problem
Existing grant-based uplink transmission methods in wireless communication networks are inefficient due to high overhead and delay associated with dedicated scheduling, especially when multiple user equipment (UE) need to access shared resources simultaneously, leading to suboptimal power management and increased latency.
Innovation Solution
Implementing power control for grant-free uplink transmission using non-orthogonal multiple access, where user equipment (UE) determines transmit power based on configured uplink grants and received power levels from the network, applying transmit power offsets to manage access to shared resources and ensure fair prioritization among UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grant-based uplink transmission is used, then dedicated scheduling and resource allocation are achieved, but signaling overhead and access delay increase
Solution Approach 1:
The network pre-configures uplink grants and power control parameters for multiple UEs before they need to transmit. This preliminary setup includes assigning different power levels and transmit power offsets to different UEs, so that when uplink transmission is needed, UEs can immediately use the pre-configured resources without waiting for scheduling requests and handshaking procedures, thereby reducing access delay while maintaining reliable dedicated scheduling through the pre-established configurations
2Productivity
If multiple user equipment access shared resources simultaneously, then resource utilization improves, but power management becomes suboptimal and interference increases
Solution Approach 1:
Different power control parameters are assigned to different UEs based on their specific requirements and channel conditions. Each UE receives customized power levels, transmit power offsets, and pathloss compensation factors tailored to its local situation. This localized power management allows multiple UEs to share resources simultaneously while maintaining optimal power control for each individual UE, preventing suboptimal power management and reducing interference
Solution Approach 2:
The system dynamically adjusts power control parameters including power levels, transmit power offsets, and pathloss compensation factors for different UEs. By changing these parameters based on UE-specific conditions and network requirements, the system enables multiple UEs to access shared resources simultaneously with optimized power management, improving resource utilization while maintaining reliable transmission
3Reliability
If transmit power is increased for shared channel access, then access reliability improves, but interference to other users increases
Solution Approach 1:
The system adjusts transmit power parameters dynamically for each UE based on its specific needs and channel conditions. By changing power levels, transmit power offsets, and pathloss compensation factors individually for different UEs, the system ensures each UE transmits at the minimum necessary power to achieve reliable access, thereby improving access reliability while minimizing interference to other users sharing the same resources
Data Source
AI summary
A method and apparatus is provided, wherein configuration information for a transmission is determined based on a configured uplink grant. Information of an assigned one of a plurality of different received by a network entity power levels for each user equipment for a given transmission instance is received. A transmit power offset is determined, based on the received information of the assigned one of the plurality of different received by the network entity power levels. A transmit power for transmission is determined, based on the configuration information of the configured uplink grant by applying the determined transmit power offset, when the determined transmit power with the determined transmit power offset applied is not less than a predefined threshold value, and by not applying the determined transmit power offset, when the determined transmit power with the determined transmit power offset applied is less than the predefined threshold value. An uplink transmission is performed using the determined transmit power for transmission.