SRS Antenna Switching Interference Mitigation in Wireless UE
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Solution Overview
Problem
Wireless communication networks face interference issues due to sounding reference signals (SRS) antenna switching, which can disrupt data reception on overlapping frequency bands.
Innovation Solution
User equipment (UE) and base stations implement interference mitigation measures, such as skipping SRS transmissions, adjusting reported channel quality indicators (CQI) and rank indicators (RI), and performing smart slot scheduling to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS antenna switching is performed to enable channel estimation on multiple frequency bands, then channel estimation capability is improved, but receive interference occurs on overlapping frequency bands
Solution Approach 1:
The patent segments the frequency bands into non-overlapping groups, assigning different SRS transmission configurations to each group. This segmentation prevents simultaneous SRS transmissions on overlapping frequency bands, thereby eliminating receive interference while maintaining channel estimation capability across all bands through sequential measurements.
Solution Approach 2:
The patent implements periodic SRS transmissions with different periodicities for different frequency bands. By configuring longer SRS periodicity for bands that may overlap with data reception, the system performs channel estimation at intervals that avoid interfering with continuous data reception, thus resolving the contradiction between measurement capability and interference prevention.
2Measurement precision
If SRS transmission periodicity is reduced to improve channel estimation frequency, then channel estimation accuracy is improved, but interference with data reception increases
Solution Approach 1:
The patent applies different SRS transmission characteristics to different frequency bands based on their specific usage patterns. Bands designated for frequent channel estimation receive shorter periodicity configurations, while bands that may overlap with data reception use longer periodicity. This localized differentiation resolves the contradiction by optimizing each band's SRS behavior according to its specific requirements.
Solution Approach 2:
The patent dynamically adjusts SRS transmission parameters including periodicity, bandwidth, and power based on the detected operating mode and interference conditions. When interference is detected, the system changes parameters to reduce SRS transmission frequency or power, thereby maintaining channel estimation capability while minimizing interference with data reception.
3Productivity
If multiple frequency bands are used simultaneously to increase throughput, then network throughput is improved, but interference management complexity increases
Solution Approach 1:
The patent performs preliminary identification of potentially interfering frequency band combinations before data transmission begins. By detecting and flagging overlapping bands in advance, the system can pre-configure appropriate SRS transmission parameters or adjust scheduling to avoid interference, thereby enabling multiple band operation without adding significant management complexity during active transmission.
Data Source
AI summary
Techniques described herein includes solutions for mitigating interference related to antenna switching. A user equipment (UE) may determine a potential for interference to data reception on a second frequency band due to antenna switching associated with transmission of reference signals on a first frequency band. In response to the determination, the UE may select one or more interference mitigation measures based on an operating mode of the UE and one or more UE parameters. An interference mitigation measure may include backing off on a reported value, such as a channel quality indicator (CQI), rank indicator (RI), or reference signal received power (RSRP). The interference mitigation measure may further include skipping reference signal transmission on the first frequency band and the antenna switching associated therewith.