SRS Resource Indicator Duplexing Type Matching
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Solution Overview
Problem
In wireless communication networks that support subband full duplexing, the selection of sounding reference signals (SRS) using SRS resource indicators (SRIs) can lead to reduced transmission efficiency and increased error rates due to differences in uplink link quality between subband full duplexing (SBFD) and non-SBFD symbols, resulting in residual self-interference and cross-link interference.
Innovation Solution
The method involves transmitting a first SRS associated with a first duplexing type and a second SRS associated with a different duplexing type, with an SRI indicating the configuration for a data channel communication to use the best transmission parameters matching the duplexing type of the slot, ensuring compatibility and efficiency by configuring SRS sets with the same usage parameter for a given transmission reception point or panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single SRS resource indicator is used for both SBFD and non-SBFD slots, then the device complexity is reduced, but the transmission reliability deteriorates due to residual self-interference and cross-link interference
Solution Approach 1:
The patent segments the SRS resource indicator configuration into separate configurations for SBFD slots and non-SBFD slots. The network device configures different SRS resource indicator values for different slot types, allowing independent optimization for each duplexing mode. This segmentation resolves the contradiction by maintaining simple configuration within each segment while improving overall reliability through type-specific optimization.
Solution Approach 2:
The patent applies local quality by using different SRS resource indicator configurations tailored to specific slot types. SBFD slots receive one configuration optimized for their interference characteristics, while non-SBFD slots receive another configuration. This localized optimization improves transmission reliability for each slot type without unnecessarily complicating the overall system.
2Device complexity
If SRS configuration does not account for duplexing type differences, then the system operates with simpler parameters, but the signal-to-interference ratio deteriorates due to mismatched transmission parameters
Solution Approach 1:
The patent implements local quality by configuring SRS parameters specifically tailored to each duplexing type. SBFD slots use SRS resource indicators optimized for their interference environment, while non-SBFD slots use different indicators. This ensures transmission parameters match the local interference conditions of each slot type, improving signal-to-interference ratio without excessive system-wide complexity.
Solution Approach 2:
The patent changes SRS configuration parameters based on the duplexing type of the slot. The network device selects different SRS resource indicator values depending on whether the slot is SBFD or non-SBFD, adapting transmission parameters to match the interference characteristics of each slot type. This parameter adaptation improves signal quality while maintaining reasonable configuration complexity.
3Loss of time
If the SRI indicates the most recent SRS regardless of duplexing type, then the processing time is reduced, but the transmission efficiency deteriorates due to using suboptimal beams
Solution Approach 1:
The patent applies local quality by selecting SRS resources based on the duplexing type of the target slot. Instead of always using the most recent SRS, the network device selects from SRS resources configured for the specific duplexing type of the slot being scheduled. This ensures optimal beam selection for each slot type while maintaining efficient processing through pre-configured SRS resources.
Solution Approach 2:
The patent uses preliminary action by pre-configuring separate SRS resource indicators for SBFD and non-SBFD slots. This allows the network device to quickly select the appropriate pre-configured indicator without complex real-time analysis, reducing processing time while ensuring the selected SRS is optimized for the specific duplexing type, thereby maintaining high transmission efficiency.
Data Source
AI summary
Various aspects relate generally to sounding reference signal (SRS) reference indicators (SRIs) indicating an SRS associated with a transmission configuration to use for transmission of a data channel communication. Some aspects more specifically relate to an SRI indicating an SRS from an SRS resource having a same duplexing type as a slot in which the data channel communication is scheduled. In some aspects, the SRI may indicate an SRS from an SRS resource that is not a most-recent SRS resource based on the most-recent SRS resource having a different duplexing type than the slot in which the data channel communication is scheduled.