MAC-Layer Pathloss Reference Signal Mapping for Fast Reconfiguration
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently configuring and updating mappings for pathloss reference signals, leading to high latency and resource consumption in power control and beam management operations.
Innovation Solution
Implementing medium access control (MAC)-layer signaling for reconfiguring mappings between pathloss reference signals and power control identifiers or sounding reference signal resource sets, using explicit and implicit signaling techniques to reduce latency and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If MAC-layer signaling is used to reconfigure mappings between pathloss reference signals and power control identifiers, then flexibility and latency are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent introduces MAC-layer signaling as an intermediary mechanism between the physical layer and higher layers. This intermediary enables dynamic mapping reconfiguration without requiring full RRC reconfiguration, thereby reducing latency while managing processing overhead through targeted updates rather than comprehensive system reconfiguration.
Solution Approach 2:
The patent segments the configuration process into multiple layers: RRC layer for initial configuration and MAC layer for dynamic updates. This segmentation allows critical pathloss reference signal mappings to be updated rapidly at the MAC layer without involving the entire RRC reconfiguration process, thus reducing latency while distributing processing complexity across different protocol layers.
2Adaptability or versatility
If dynamic mapping reconfiguration is implemented at MAC layer, then adaptability is improved, but resource consumption increases
Solution Approach 1:
The patent implements dynamic mapping reconfiguration at the MAC layer, allowing the system to adapt pathloss reference signal mappings in real-time based on changing channel conditions and traffic requirements. This dynamic capability improves adaptability while the MAC layer's efficient signaling mechanisms help control resource consumption by updating only necessary parameters rather than comprehensive configurations.
Solution Approach 2:
The patent changes the operational parameters of pathloss reference signal mappings dynamically through MAC-layer commands. By modifying specific mapping parameters (such as associating different pathloss reference RS IDs with different power control identifier sets) rather than reconfiguring entire signal structures, the system achieves improved adaptability with controlled resource consumption.
3Reliability
If multiple pathloss reference signal mappings are maintained, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal mapping framework where pathloss reference signal mappings can be dynamically associated with different power control identifier sets and SRS resource sets through MAC-layer signaling. This multi-functional mapping structure enables the system to maintain multiple mappings for different transmission scenarios (PUSCH, SRS) while using a unified management approach, thereby improving reliability without proportionally increasing device complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a medium access control layer message indicating a set of mappings between a set of pathloss reference signals and one of: a set of physical uplink shared channel identifiers, or a set of sounding reference signal identifiers; receive downlink control information activating a mapping of the set of mappings; and perform a pathloss measurement using a pathloss reference signal identified by the activated mapping. Numerous other aspects are provided.