Reference Signal Parameter Determination for Interference Reduction
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Solution Overview
Problem
In LTE systems, the existing reference signal design for MU-MIMO and D-TDD scenarios leads to deteriorated performance due to overlapping communication resources and severe uplink-downlink cross interference, which is not effectively addressed by current technologies.
Innovation Solution
The method involves dividing the bandwidth into frequency domain resource units, where parameters for reference signal sequences are determined based on frequency domain location information, cell identification, and configuration information, allowing for quasi-orthogonal reference signals across cells, reducing peak-to-average power ratio, and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flexible scheduling for MU-MIMO is used, then resource utilization is improved, but communication resources overlap between users causing performance deterioration
Solution Approach 1:
The bandwidth is divided into multiple frequency domain resource units, and different reference signal parameters are allocated to different resource units. This segmentation allows multi-user multiplexing on the same time-frequency resources while maintaining signal distinguishability through parameter differentiation, thus resolving the contradiction between resource utilization and performance.
Solution Approach 2:
Different reference signal parameters (such as ZC root indices, cyclic shifts, or orthogonal cover codes) are assigned to different frequency domain resource units or users. This local differentiation ensures that each user's reference signal has unique characteristics in its allocated resources, enabling reliable channel estimation and signal separation even when resources overlap, thereby maintaining MU-MIMO performance while improving resource utilization.
2Adaptability or versatility
If LTE reference signal design is used in D-TDD scenario, then system compatibility is maintained, but severe uplink-downlink cross interference occurs between cells
Solution Approach 1:
The patent modifies reference signal parameters (such as ZC root indices, cyclic shift values, or orthogonal cover codes) based on frequency domain resource unit location and cell identification. This parameter differentiation creates quasi-orthogonal reference signals between cells, enabling the system to maintain LTE compatibility while effectively reducing uplink-downlink cross interference in D-TDD scenarios through enhanced signal distinguishability.
Data Source
AI summary
Embodiments provide a method for transmitting a reference signal between a base station and a terminal. In this method, a parameter is determined by a terminal based on frequency domain location information of a frequency domain resource unit. The parameter is used to determine a sequence of the reference signal, and the reference signal is carried on the frequency domain resource unit. The reference signal can be sent to the base station by the terminal. In some embodiments, the reference signal sent by the base station can be received by the terminal. According to this method, a peak-to-average power ratio when a single terminal sends data to a base station can be reduced, and communication interference between different cells can be canceled or reduced as much as possible.