Flexible SRS Configuration for CoMP Link Quality Estimation
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Solution Overview
Problem
Existing SRS technologies are inadequate for measuring link quality and relative delays of coordinated cells in CoMP systems, as they are designed for serving cells only and cannot accommodate extended CP lengths within the limited subframe time, degrading the effectiveness of CoMP multi-cell coordinated reception.
Innovation Solution
A method for transmitting and receiving SRS signals with flexible configuration of extended CP or normal CP, allowing mobile communication terminals to transmit extended CP SRS signals and normal CP SRS signals based on transmission position indication information, enabling accurate estimation of link quality and relative delays of coordinated cells without altering the CP length for other data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an extended CP SRS signal is used to measure link quality of coordinated cells, then measurement accuracy improves, but the subframe time is insufficient to accommodate the extended CP length
Solution Approach 1:
The patent divides the SRS transmission into two distinct types: normal CP SRS for serving cell measurement and extended CP SRS for coordinated cell measurement. This segmentation allows each SRS type to use the appropriate CP length for its specific measurement purpose, resolving the contradiction between needing extended CP for accurate coordinated cell measurement and the subframe time limitation.
Solution Approach 2:
The patent introduces dynamic configuration where the base station can flexibly indicate to the user equipment whether to transmit normal CP SRS or extended CP SRS in each subframe based on measurement requirements. This dynamic switching enables the system to adaptively use extended CP when coordinated cell measurement is needed while maintaining normal operation otherwise, overcoming the static subframe time constraint.
2Ease of operation
If a normal CP is configured in the serving cell and coordinated cells, then OFDM symbol transmission is maintained, but extended CP SRS signals cannot be transmitted due to total time limitation
Solution Approach 1:
The patent implements dynamic SRS configuration where the base station can indicate to the user equipment whether to transmit normal CP SRS or extended CP SRS in each subframe. This dynamic approach allows the system to maintain normal CP configuration for regular OFDM symbol transmission while providing the flexibility to switch to extended CP SRS when coordinated cell measurement is required, resolving the contradiction between operational simplicity and configuration adaptability.
3Device complexity
If existing SRS technology is used for serving cell measurement, then transmission is simple, but it cannot measure link quality and relative delays of coordinated cells effectively
Solution Approach 1:
The patent segments the SRS measurement function into two distinct modes: normal CP SRS for simple serving cell measurement and extended CP SRS for coordinated cell measurement. This segmentation allows the system to maintain simple transmission for serving cell measurements while enabling effective coordinated cell measurement when needed, resolving the contradiction between transmission simplicity and measurement capability.
Solution Approach 2:
The patent creates a universal SRS transmission mechanism that can perform both serving cell measurement and coordinated cell measurement through the same basic SRS structure, with the only difference being the CP length. This multi-functionality allows a single SRS mechanism to serve multiple measurement purposes, reducing overall system complexity while expanding measurement capabilities.
Data Source
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AI summary
A method for transmitting and receiving Sounding Reference Signal (SRS), which is used to realize the purpose of estimation of link quality and relative delays in adjacent cells by use of expanded Cyclic Prefix (CP) SRS signal, is disclosed, with implementation of a mobile communication terminal (1) transmitting the expanded CP SRS signal required for the estimation of the link quality and delay information of users in the adjacent cells based on transmission position indication information of expanded CP SRS signal and common CP SRS signal from a base station (2) without changing CP length required for other data transmission in the adjacent cells, so as to provide conditions to application of Coordinated Multi Point Transmission and Reception (CoMP) technology.