Uplink Reference Signal Configuration for CoMP Interference
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Solution Overview
Problem
In wireless communication systems, particularly in CoMP scenarios, there is a need to dynamically switch between generating identical and distinct uplink reference signals for User Equipments (UEs) to manage interference and ensure optimal channel state estimation, which existing technologies struggle to achieve effectively.
Innovation Solution
A method and apparatus for configuring a parameter set for uplink reference signals, including a Virtual Cell Identifier (VCID) and a cyclic shift hopping initial value parameter (initCSH), allowing dynamic switching between two types of reference signals based on communication environments, enabling UEs to generate and transmit appropriate signals for channel state estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If identical uplink reference signals are used for all UEs, then channel state estimation consistency is improved, but inter-cell interference increases at cell boundaries
Solution Approach 1:
The patent applies local quality by differentiating reference signal generation based on UE location. UEs in cell boundary areas use distinct reference signals with different cyclic shifts to reduce interference, while UEs in non-boundary areas use identical reference signals for consistency. The eNodeB determines the appropriate reference signal type based on UE location relative to cell boundaries.
Solution Approach 2:
The patent implements dynamics by enabling dynamic switching between identical and distinct reference signal configurations. The system can adapt the reference signal type based on current communication conditions, UE location, and interference levels. This dynamic adjustment allows the system to optimize performance for different scenarios rather than using a fixed configuration.
2Object-affected harmful factors
If distinct uplink reference signals are used for all UEs, then inter-cell interference is reduced, but channel state estimation consistency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating reference signal generation based on UE location. UEs in cell boundary areas use distinct reference signals with different cyclic shifts to reduce interference, while UEs in non-boundary areas use identical reference signals for consistency. The eNodeB determines the appropriate reference signal type based on UE location relative to cell boundaries.
Solution Approach 2:
The patent implements dynamics by enabling dynamic switching between identical and distinct reference signal configurations. The system can adapt the reference signal type based on current communication conditions, UE location, and interference levels. This dynamic adjustment allows the system to optimize performance for different scenarios rather than using a fixed configuration.
3Productivity
If dynamic switching between reference signal types is implemented, then communication performance is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamics by enabling dynamic switching between identical and distinct reference signal configurations. The system can adapt the reference signal type based on current communication conditions, UE location, and interference levels. This dynamic adjustment allows the system to optimize performance for different scenarios rather than using a fixed configuration.
Solution Approach 2:
The patent applies parameter changes by modifying the cyclic shift parameter of the reference signal based on UE location and communication conditions. The system changes the cyclic shift value to generate either identical or distinct reference signals, providing a flexible mechanism to adapt to different scenarios without requiring fundamental system changes.
4Reliability
If reference signals are configured for CoMP scenarios, then cell boundary user performance is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by differentiating reference signal generation based on UE location. UEs in cell boundary areas use distinct reference signals with different cyclic shifts to reduce interference, while UEs in non-boundary areas use identical reference signals for consistency. The eNodeB determines the appropriate reference signal type based on UE location relative to cell boundaries.
Data Source
AI summary
The present invention relates to a method and an apparatus for transmitting and receiving a reference signal in a wireless communication system. In the method, in order to dynamically switch an uplink (UL) Demodulation-Reference Signal (DM-RS) according to the communication environment, such as CoMP and MU-MIMO, a parameter set for generation of a reference signal sequence is configured to include a Virtual Cell Identifier (VCID) parameter configured by information of a total of 9 bits and a cyclic shift hopping initial value parameter cinitCSH, which is 9-bit information representing one integer value among 510 integer values. Therefore, it may be possible to achieve dynamic transmission or reception of a reference signal and channel estimation through the dynamic transmission or reception of the reference signal even when the communication environment dynamically changes as in a Cooperative Multiple Point transmission and reception (CoMP) scenario.