Sounding Reference Signal Configuration for CoMP Interference
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Solution Overview
Problem
Wireless communication systems face challenges in reliably achieving high data rates due to limited bandwidth and interference constraints, particularly in coordinated multipoint (CoMP) operations, where channel status feedback can increase interference.
Innovation Solution
The use of sounding reference signals (SRS) is configured and managed to support CoMP operations, with parameters such as transmit power, bandwidth, and frequency hopping being adjusted to ensure reliable reception by multiple base stations while minimizing interference, using mechanisms like open-loop power control and additional offsets for enhanced power boosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel status feedback is transmitted to support CoMP operations, then communication reliability is improved, but interference increases
Solution Approach 1:
The patent extracts the sounding reference signal (SRS) transmission function from the traditional single-cell uplink feedback mechanism and redirects it to serve multiple base stations in a CoMP scenario. By configuring SRS to be transmitted on the uplink of a serving cell but received and utilized by multiple base stations including non-serving cells, the system obtains channel status information without requiring additional dedicated feedback channels that would increase interference.
Solution Approach 2:
The sounding reference signal transmitted on the uplink serves multiple functions simultaneously: it provides channel status feedback for the serving cell, enables channel estimation for non-serving cells in the CoMP set, and supports coordinated transmission/reception across multiple base stations. This multi-functionality eliminates the need for separate feedback mechanisms for each base station, reducing overall system interference while maintaining communication reliability.
2Measurement precision
If sounding reference signal transmit power is increased to improve reception by multiple base stations, then channel status feedback quality is improved, but uplink interference increases
Solution Approach 1:
The patent applies different power control strategies for different reception scenarios. The serving base station uses standard uplink power control for SRS received on the serving cell uplink, while non-serving base stations in the CoMP set utilize the SRS transmissions with appropriate receiver-side processing. This localized quality approach ensures that the transmit power remains optimized for the serving cell while still providing sufficient signal quality for channel estimation at non-serving cells through coordinated reception.
Solution Approach 2:
The serving cell uplink acts as an intermediary medium that carries the sounding reference signal to multiple base stations. Instead of requiring each base station to have dedicated uplink feedback channels that would all require high transmit power, the system uses the serving cell uplink as a shared intermediary that delivers channel status information to the entire CoMP set, reducing overall uplink interference while maintaining measurement precision.
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AI summary
Systems and methodologies are described that facilitate configuring a sounding reference signal transmission in a wireless communication environment. A UE can employ coordinated multi-point transmission and/or reception such that multiple cells collaborate to transmit data to the UE and/or receive data from the UE. To support the coordinated multi-point transmission and/or reception, the UE can transmit a sounding reference signal that is configured to enable reliable reception of the sounding reference signal by members of a cooperating set. In addition, configuration of the sounding reference signal can be coordinated to enable more efficient transmission and utilization of the sounding reference signal. Configuration of the sounding reference signal can be based upon information exchanged between the multiple cells. Moreover, the multiple cells can coordinate to set and control a transmit power of the sounding reference signal.