Wireless Interference Cancellation via Common Private Message Segmentation
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Solution Overview
Problem
Existing techniques for relieving intercell interference in wireless communication systems, such as interference align, rate divide, and interference neutralize methods, face limitations including power loss and inefficient utilization of signal dimensions, particularly in micro, pico, and femto cells, where interference intensity can exceed signal intensity, leading to performance deterioration.
Innovation Solution
A method and apparatus that utilize a rate divide technique with weight determination for canceling interference by neighbor transmission nodes, where transmission nodes encode data into common and private messages, and reception nodes decode these messages using Successive Interference Cancellation (SIC) or cooperative decoding, optimizing data rates by adjusting the ratio of common to private message transmission based on signal and interference intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference align technique is used, then signal reception in intended reception end is improved, but dimension utilization is reduced and performance deteriorates when signal intensity is small
Solution Approach 1:
The message is segmented into common message and private message parts. The common message is transmitted using interference align technique to ensure reliable reception, while the private message utilizes the remaining dimensions. This segmentation resolves the contradiction by applying interference alignment only to the extent necessary for reliability while preserving dimension utilization for additional data transmission.
Solution Approach 2:
The patent changes the parameter of message structure from uniform to differentiated (common vs. private messages with different encoding schemes). By adjusting the ratio of common to private messages based on channel conditions, the system optimizes both reliability and productivity dynamically, overcoming the limitation of fixed dimension utilization in traditional interference alignment.
2Productivity
If interference neutralize technique is used, then all dimension is utilized, but power loss occurs
Solution Approach 1:
Instead of applying interference neutralization to all dimensions (excessive action), the patent applies it only to the common message portion (partial action). The private message portion uses simpler transmission without full neutralization, reducing the overall power requirement while still achieving dimension utilization benefits for the common message.
3Use of energy by moving object
If rate divide technique is used, then power consumption is reduced, but interference cancellation capability is limited
Solution Approach 1:
The message segmentation into common and private parts enables differentiated interference handling. The common message benefits from interference cancellation techniques to reduce harmful interference impact, while the private message uses rate divide principles for power efficiency. This segmented approach resolves the contradiction by applying each technique to the message portion where it is most effective.
Data Source
AI summary
An apparatus and a method relieve intercell interference in a wireless communication system. In a method for operating a transmission node, a first private message encoding a portion of transmission data of a neighbor transmission node is received. Weight for canceling the first private message of the neighbor transmission node received in a intended reception node is determined. The first private message of the neighbor transmission node multiplied by the weight, a common message encoding a portion of data to be transmitted to the intended reception node, and a second private message encoding the rest of the data are transmitted.