SRS Resource Sets for Adaptive Precoding Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sounding reference signals (SRS) for multi-antenna/multi-layer systems, particularly in transitioning between codebook-based and non-codebook-based precoding, which affects channel estimation and precoding accuracy.
Innovation Solution
The method involves configuring wireless devices to determine precoding configurations for SRS transmission based on defined resource sets, using indicators like DL RS or reciprocity-based methods, enabling dynamic switching between codebook-based and non-codebook-based UL transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If codebook-based precoding is used for SRS transmission, then precoding configuration is simplified and device complexity is reduced, but precoding flexibility and adaptability to channel conditions deteriorate
Solution Approach 1:
The system dynamically switches between codebook-based and non-codebook-based precoding modes based on channel conditions and transmission requirements. The network can configure different SRS resource sets with different precoding types and switch between them, making the precoding approach adaptive rather than static.
Solution Approach 2:
The invention changes the precoding configuration parameters by introducing multiple SRS resource sets with different precodingType values (codebook or nonCodebook). The network can modify which resource set is active based on channel conditions, effectively changing the precoding behavior without altering the fundamental system architecture.
2Measurement precision
If non-codebook-based precoding is used for SRS transmission, then precoding flexibility and channel estimation accuracy are improved, but device complexity and configuration overhead increase
Solution Approach 1:
The SRS resources are segmented into multiple resource sets, where each set can be configured with different precoding types. This segmentation allows the system to use non-codebook-based precoding only when needed for improved channel estimation, while falling back to simpler codebook-based approaches otherwise, thereby managing complexity selectively.
Solution Approach 2:
The network acts as an intermediary that manages the complexity by centrally configuring and switching between different SRS resource sets. The network node determines when non-codebook-based precoding is beneficial and configures the appropriate resource sets, offloading the decision-making from the UE and managing complexity at the network level.
3Adaptability or versatility
If multiple SRS resource sets are configured for different precoding types, then adaptability between codebook and non-codebook based transmissions is improved, but configuration complexity and resource management overhead increase
Solution Approach 1:
The SRS resource set configuration framework is designed to be universal, supporting both codebook-based and non-codebook-based precoding within the same system architecture. Each resource set can serve multiple purposes depending on configuration, and the same switching mechanism handles different transmission scenarios, reducing the need for separate specialized configurations.
Solution Approach 2:
The network performs preliminary configuration of multiple SRS resource sets with different precoding types before actual transmission begins. By pre-configuring the resource sets and their associated parameters, the system avoids complex real-time decision-making during transmission, as the switching between modes is based on pre-established configurations.
Data Source
AI summary
A method, wireless device and network node for performing sounding reference signal (SRS) transmission. According to one aspect a method includes receiving a definition of one or more SRS resource sets to be configured, comprising at least one SRS transmission setting. The method further includes receiving an indication of a selected SRS resource set to use for a SRS transmission, from the one or more configured SRS resource sets and determining a precoding configuration for the SRS transmission based on the selected SRS resource set and the at least one SRS transmission setting. The method also includes transmitting a SRS according to the determined precoding configuration.