MAC-CE Pathloss Reference Signal Activation for 5G Uplink Power Control
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in dynamically updating pathloss reference signals, which affects the accuracy of uplink power control and channel adaptation, leading to potential interference and reduced efficiency in resource allocation.
Innovation Solution
The method involves a base station transmitting an indication to user equipment (UE) to enable MAC-CE activation of pathloss reference signals, allowing for dynamic updates of these signals, enabling more accurate downlink pathloss estimation and uplink power control by activating specific pathloss reference signals based on MAC-CE updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pathloss reference signals are updated dynamically via MAC-CE, then the accuracy of uplink power control and channel adaptation is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent implements dynamic pathloss reference signal updates by enabling MAC-CE to activate different pathloss reference signals based on current channel conditions. The base station can dynamically switch between multiple configured pathloss reference signals (PLRS) without requiring full RRC reconfiguration, allowing the system to adapt to changing channel characteristics in real-time while maintaining manageable complexity through pre-configuration of multiple PLRS candidates.
2Adaptability or versatility
If multiple pathloss reference signals are configured and activated via MAC-CE, then the adaptability of channel management is improved, but the signaling overhead and processing requirements increase
Solution Approach 1:
The patent segments the pathloss reference signal configuration into two distinct phases: (1) RRC configuration phase where multiple PLRS candidates are pre-configured with their parameters, and (2) MAC-CE activation phase where specific PLRS are activated based on current needs. This segmentation allows the system to maintain high adaptability by having multiple pre-configured options while reducing signaling overhead by only transmitting activation commands via MAC-CE rather than full reconfiguration messages.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple pathloss reference signal candidates through RRC signaling before they are needed. This allows the base station to quickly activate appropriate PLRS via compact MAC-CE commands when channel conditions change, rather than performing full reconfiguration procedures. The pre-configuration includes all necessary parameters, so only activation indicators need to be signaled dynamically.
3Speed
If MAC-CE activation is used for pathloss reference signals, then the speed of power control updates is improved, but the reliability requirements and potential for errors increase
Solution Approach 1:
The patent incorporates feedback mechanisms where the base station monitors uplink transmissions and channel conditions, then uses MAC-CE to activate appropriate pathloss reference signals based on observed performance. The system continuously adapts by comparing actual channel conditions with expectations from activated PLRS, allowing for corrective actions if activation errors occur. This feedback loop enhances reliability while maintaining the speed benefits of MAC-CE-based activation.
Data Source
AI summary
A method, a computer-readable medium, and an apparatus are provided for wireless communication at a user equipment. The UE receives an indication from a base station that a medium access control-control element (MAC-CE) activation of a pathloss reference signal is enabled. The UE receives a MAC-CE activating the pathloss reference signal. The UE determines the pathloss reference signal based on the MAC-CE and the indication that indicates that the MAC-CE activation of the pathloss reference signal is enabled. Then, the UE estimates a downlink pathloss based on the pathloss reference signal that is activated by the MAC-CE.