Common Pathloss Reference Signal for SDM Uplink
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the number of concurrent spatial domain multiplexing (SDM) streams increases in wireless communication systems, especially at higher frequency bands like millimeter wave, the beam management overhead and complexity rise, leading to increased latency, which is undesirable for efficient data transmission.
Innovation Solution
Implementing a method where a base station configures a common reference signal for multiple SDM uplink streams, reducing the need for individual configuration messages and overhead by grouping streams, allowing for efficient power control and reduced latency through the use of a common PathlossReferenceRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual reference signals are configured for each SDM stream, then measurement precision is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent combines multiple individual reference signal configurations into a single common reference signal that serves multiple SDM streams simultaneously. This merging approach maintains the ability to measure channel quality for each stream while eliminating the need for separate reference signal configurations, thereby reducing beam management complexity and signaling overhead without sacrificing measurement precision.
Solution Approach 2:
The common reference signal is designed to serve multiple functions across different SDM streams. A single reference signal configuration enables the system to perform channel estimation, quality measurement, and power control for multiple streams simultaneously, making the reference signal mechanism universal rather than stream-specific, thus reducing overall system complexity.
2Measurement precision
If individual reference signals are configured for each SDM stream, then measurement precision is improved, but loss of time increases due to increased overhead
Solution Approach 1:
By merging the configuration of reference signals for multiple SDM streams into a single common reference signal, the patent eliminates the sequential overhead of configuring and processing individual reference signals for each stream. This consolidation reduces the time required for beam management operations while maintaining the precision needed for accurate channel measurements across all streams.
3Device complexity
If a common reference signal is used for multiple SDM streams, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent applies local quality by allowing the common reference signal to be stream-specific in its application while maintaining a unified configuration approach. Each SDM stream can utilize the common reference signal with stream-specific processing and measurement, ensuring that measurement precision is maintained for each individual stream even though the reference signal configuration is shared across multiple streams.
Data Source
AI summary
Wireless communications systems and methods related to reducing the signaling overhead for configuring a common reference signal used in performing coarse power control of multiple spatial domain multiplexing (SDM) uplink streams are provided. A base station may be in communication with a UE via multiple SDM streams directed from the same panel of the respective device. The base station may configure a common pathloss reference signal for the SDM streams of the same panel for the UE. This may include sending a list of possible pathloss reference signal configurations to the UE, and then identifying which configuration to use for the pathloss reference signal for the group of SDM streams. Once known, the UE may measure the reference signal for open loop power control. The BS may occasionally reconfigure the common reference signal for the grouped SDM streams.