SRS Antenna Switching Configuration Optimization for FDD Interference
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Solution Overview
Problem
In heterogeneous wireless networks, particularly those using carrier aggregation with FDD and TDD duplexing, antenna switching configurations can lead to increased block error rates and downlink throughput degradation due to interference with FDD downlink signals during SRS transmission.
Innovation Solution
Optimizing the SRS antenna switching configuration by selecting a configuration that minimizes interference with FDD downlink signals, such as switching from an original 1T4R configuration to a 1T2R configuration based on slot cycle spacing and periodicity, allowing fewer antennas to be used for SRS transmission, thereby reducing puncturing of FDD reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna switching configuration is used for SRS transmission, then channel quality estimation capability is improved, but FDD downlink throughput is degraded due to interference
Solution Approach 1:
The patent implements dynamic antenna switching configuration where the wireless device adapts its antenna switching behavior based on detected FDD downlink signals. The device dynamically adjusts between different antenna switching modes (e.g., 1T4R, 1T2R, 2T4R configurations) depending on the presence and characteristics of FDD downlink transmissions, allowing optimization of both channel estimation accuracy and downlink throughput under varying network conditions.
Solution Approach 2:
The patent changes the antenna switching parameters (number of transmit and receive antennas involved in switching) based on FDD downlink signal detection. By modifying the antenna configuration parameters dynamically, the system resolves the contradiction between maintaining high channel estimation precision and preserving FDD downlink throughput performance.
2Measurement precision
If antenna switching is performed during SRS transmission, then uplink channel estimation is improved, but block error rate increases due to puncturing of FDD reception
Solution Approach 1:
The system dynamically adjusts the antenna switching configuration based on real-time detection of FDD downlink signals. When FDD downlink signals are detected, the device modifies its antenna switching behavior to avoid puncturing FDD receptions, thereby maintaining low block error rates while still enabling accurate uplink channel estimation through alternative antenna configurations.
Solution Approach 2:
The patent modifies the antenna switching parameters (such as the number of antennas used for SRS transmission) based on the detected FDD downlink signal conditions. By changing these parameters adaptively, the system achieves reliable uplink channel estimation without causing excessive puncturing to FDD downlink receptions, thus maintaining low block error rates.
3Measurement precision
If more antennas are used for SRS transmission, then channel estimation accuracy is improved, but interference with FDD downlink signals increases
Solution Approach 1:
The wireless device dynamically adjusts the number of antennas used for SRS transmission based on the presence and characteristics of FDD downlink signals. When FDD downlink signals are detected, the device reduces the number of antennas involved in antenna switching to minimize interference, while still maintaining sufficient channel estimation accuracy through optimized use of the remaining antennas.
Solution Approach 2:
The patent changes the antenna configuration parameters (number of transmit and receive antennas) based on FDD downlink signal detection. By adaptively modifying these parameters, the system achieves an optimal balance between channel estimation accuracy and interference minimization to FDD downlink signals.
Data Source
AI summary
Methods provided herein include receiving, at a user equipment (UE) a UE capability enquiry from a radio access network (RAN). The UE has an original antenna configuration and is capable of new radio carrier aggregation (NRCA). Methods include sending from the UE to the RAN, in response to the UE capability enquiry, a UE capability information message. The UE capability information message indicates an optimized SRS antenna switching configuration that is different from the original antenna configuration.