SRS Time Bundling for Low-Overhead Channel Estimation
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Solution Overview
Problem
Existing wireless communication systems fail to efficiently adapt SRS configurations for rapid changes in channel conditions and introduce excessive overhead when attempting to improve SRS coverage and channel estimation, particularly in scenarios involving aperiodic, periodic, and semi-persistent SRS transmissions.
Innovation Solution
Implement time bundling across different SRS transmissions, including power control and dynamic enabling/disabling mechanisms, to enhance channel estimation quality without excessive overhead, by combining aperiodic, periodic, and semi-persistent SRS transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmissions are increased to improve channel estimation quality, then measurement precision improves, but device complexity and overhead increase
Solution Approach 1:
The patent combines multiple SRS transmissions from different resource sets (first and second SRS resource sets) into a single channel estimation process. The network device receives SRS transmissions from both resource sets and performs joint channel estimation, merging the information from multiple sources to improve measurement precision while avoiding the overhead of separate estimation processes
Solution Approach 2:
The patent enables SRS resources in different resource sets to serve a universal channel estimation function. By configuring multiple SRS resource sets with different usage types (e.g., codebook, nonCodebook, antennaSwitching) to all contribute to channel estimation, the system achieves multi-functionality where diverse SRS transmissions collectively support the same objective without requiring separate dedicated resources for each function
2Adaptability or versatility
If SRS resource sets are increased to cover different usage types, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent makes SRS resource sets universal by enabling them to serve multiple usage types simultaneously. Different SRS resource sets configured with different usage types (codebook, nonCodebook, antennaSwitching) are all utilized for channel estimation, allowing the system to adapt to various transmission scenarios without managing separate dedicated resource sets for each usage type
Solution Approach 2:
The patent introduces dynamic selection and configuration of SRS resource sets based on current channel conditions and transmission requirements. The network device can dynamically determine which SRS resource sets to activate and how to combine them, allowing the system to adapt flexibly to changing conditions without being locked into fixed configurations
3Loss of information
If multiple SRS resource sets are transmitted, then information completeness improves, but loss of time increases
Solution Approach 1:
The patent merges channel estimation from multiple SRS resource sets into a unified estimation process. Instead of sequentially processing separate estimations from different resource sets, the network device combines the SRS transmissions and performs joint estimation, reducing the total time required while maintaining complete channel state information
Data Source
AI summary
A method, system and apparatus are disclosed. According to one or more embodiments, a network node configured to communicate with a wireless device is provided. The network node includes processing circuitry configured to receive an indication of a wireless device capability to maintain phase coherence within a predefined tolerance for reference signals transmitted by the wireless device in different time slots, receive a first reference signal transmission in a first time slot and a second reference signal transmission in a second time slot where the first reference signal transmission is an aperiodic, AP, reference signal transmission, and perform channel estimation at least in part by combining the first reference signal transmission and the second reference signal transmission.