SRS Subframe Configuration for CoMP Interference Reduction
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Solution Overview
Problem
In Cooperative Multi-Point (CoMP) systems, existing methods for transmitting Sounding Reference Signals (SRS) are inefficient, particularly in distributed antenna environments, leading to suboptimal uplink data transmission rates due to interference and resource wastage.
Innovation Solution
The method involves reorganizing SRS subframes by distributing SRS resources effectively across distributed antennas based on the channel state of User Equipment (UE) and base stations, allowing for UE-specific and cell-specific SRS subframe configurations to minimize data transmission gaps and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRS resources are transmitted in distributed antenna environments using existing methods, then base stations can obtain channel state information, but interference increases and resource wastage occurs leading to suboptimal uplink data transmission rates
Solution Approach 1:
The patent segments SRS transmission by introducing UE-specific and cell-specific SRS subframe configurations. Different UEs are assigned different SRS subframes based on their channel conditions and service requirements, allowing the system to divide the uplink bandwidth into multiple SRS transmission opportunities. This segmentation reduces interference between UEs and optimizes resource utilization, directly addressing the contradiction between maintaining productivity and reducing harmful interference.
Solution Approach 2:
The patent applies local quality by configuring SRS parameters specifically tailored to each UE's channel state and service requirements. The base station determines UE-specific SRS subframe configurations based on individual UE conditions, allowing each UE to transmit SRS in the most appropriate subframes. This localized optimization reduces resource wastage and interference while maintaining high uplink data transmission rates.
2Measurement precision
If SRS transmission is optimized for distributed antennas, then channel state information feedback improves, but system complexity increases due to UE-specific and cell-specific configurations
Solution Approach 1:
The patent implements preliminary action by having the base station pre-determine and configure UE-specific and cell-specific SRS subframe configurations before SRS transmission begins. The base station calculates the optimal SRS subframe assignments based on channel conditions and service requirements, then provides these configurations to UEs in advance through RRC signaling. This preliminary configuration simplifies the transmission process and reduces real-time complexity while maintaining high measurement precision.
Solution Approach 2:
The patent uses feedback mechanisms where UEs report their channel state information and service requirements to the base station. The base station then adjusts UE-specific and cell-specific SRS subframe configurations based on this feedback, creating a closed-loop system. This feedback-driven approach optimizes channel state information feedback accuracy while managing system complexity through adaptive configuration rather than static complex structures.
3Productivity
If existing SRS transmission methods are used in CoMP systems, then implementation is simple, but uplink performance is suboptimal due to interference and resource inefficiency
Solution Approach 1:
The patent introduces dynamics by making SRS subframe configurations adaptive rather than static. UE-specific and cell-specific SRS configurations are dynamically adjusted based on changing channel conditions, traffic patterns, and service requirements. The base station can reconfigure SRS parameters in real-time to optimize uplink performance, transforming the system from a simple static approach to a dynamic adaptive one that maintains high productivity despite increased complexity.
Data Source
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AI summary
Disclosed is a method and device for transmitting a sounding reference signal (SRS) in a cooperative communication system. The method comprises the steps of: receiving, from a macro base station, SRS resource information indicating transmission resources of an SRS to be transmitted by a user equipment (UE); transmitting the SRS and uplink data on the basis of a UE-specific SRS subframe configuration included in the SRS resource information when the SRS resource information includes information on the UE-specific SRS subframe configuration; and transmitting the SRS and the uplink data on the basis of a pre-stored cell-specific SRS subframe configuration when the SRS resource information does not include the information on the UE-specific SRS subframe configuration. When a destination of the SRS to be transmitted by the UE is selected as a base station related to the macro base station, the SRS resource information includes information on the UE-specific SRS subframe configuration of the base station selected as the destination of the SRS.