Reference Signal Sequence Generation for CoMP Interference Management
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Solution Overview
Problem
Current wireless communication systems face challenges in providing high data rates to terminals at the edge of cells due to interference from neighboring cells, which limits data transmission speed and requires efficient interference control methods, especially in the context of CoMP techniques for LTE-Advanced Release 11.
Innovation Solution
A method and apparatus for transmitting a reference signal sequence r(m) in a wireless communication system, where the sequence is determined as 12(1-2*c(2m)) + j*12(1-2*c(2m+1)), with the initial value of the pseudo-random sequence cinit set as (└ns/2┘ + 1) * (2X + 1) * 216 + Y, where ns is a slot number in a radio frame, X and Y are initial value determining parameters, to enhance demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If additional antenna ports are deployed to increase data transmission speed, then data rate improves for terminals in the center of the cell, but interference from neighboring cells increases for terminals at the edge of the cell
Solution Approach 1:
The patent combines reference signals from multiple transmission points (including neighboring cells) to transmit data to a terminal. This merging approach transforms the harmful interference from neighboring cells into useful signal components, thereby improving data transmission speed for edge terminals while utilizing the additional antenna ports effectively
Solution Approach 2:
The patent converts the harmful interference from neighboring cells into beneficial signal components by coordinating multiple transmission points to transmit reference signals. The interference that would normally degrade performance is instead harnessed to improve data transmission through coordinated multi-point reception
2Speed
If frequency reuse technique through small cells is adopted to offer high-speed data service in user-crowded regions, then data rate improves, but interference control between transmission points becomes more complex
Solution Approach 1:
The patent changes the parameters of reference signals by assigning different pseudo-random sequences (identified by different initial values) to different transmission points. This parameter differentiation enables efficient interference control between transmission points in frequency reuse scenarios without requiring complex coordination mechanisms
3Reliability
If CoMP techniques are implemented to reduce interference and improve data rate, then demodulation performance improves, but the complexity of coordinating multiple transmission points increases
Solution Approach 1:
The patent uses different pseudo-random sequence initialization parameters for reference signals transmitted from different transmission points. This simple parameter differentiation enables the terminal to effectively separate and process signals from multiple transmission points, improving demodulation performance while avoiding complex coordination overhead
Data Source
AI summary
The present invention relates to a method and apparatus for transmitting data. In the method for transmitting data, a first transmission point can determine a reference signal sequence r(m) and transmit the determined reference signal sequence r(m) to a terminal. A parameter ns from among parameters for generating an initial value c_init of a pseudorandom sequence in order to determine the reference signal sequence can be determined on the basis of the slot number of a wireless frame, which a second transmission point transmits to the terminal. Accordingly, the demodulation performance of the terminal can be enhanced.