Cooperative Base Station Reception With Low-Overhead Interference Cancellation
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Solution Overview
Problem
Existing methods for eliminating interference in mobile radio networks require high data transfer rates between base stations, leading to costly communication links and reduced performance due to the need for either central processing units or extensive data exchange of likelihood values.
Innovation Solution
A method where each base station determines and relays the statistical expectation value of received symbols, reducing data transfer volume while maintaining performance by using this value for cooperative demodulation and decoding, and optimizing quantization levels based on probability distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all likelihood values are exchanged between base stations for interference elimination, then interference elimination performance is improved, but data transfer volume and communication costs increase significantly
Solution Approach 1:
The patent extracts only the essential information (statistical expectation values of received symbols) from the complete set of likelihood values and transmits only this extracted information between base stations. This selective extraction maintains interference elimination capability while dramatically reducing the data volume that must be transmitted over communication links.
Solution Approach 2:
The patent transforms the complete likelihood value distributions into simplified statistical expectation values, changing the parameter representation from full probability distributions to single expected value parameters. This parameter transformation preserves the essential interference information while reducing data complexity and transmission requirements.
2Reliability
If a central processing unit is used for joint processing of received symbols, then interference elimination is improved, but system complexity and cost increase
Solution Approach 1:
The patent segments the centralized processing function into distributed processing at individual base stations. Each base station independently calculates statistical expectation values from its received symbols and exchanges only these compact representations with neighboring base stations, eliminating the need for a centralized processing unit while maintaining cooperative interference elimination.
Solution Approach 2:
The patent introduces statistical expectation values as an intermediary representation between the raw received symbols and the final interference elimination decision. This intermediary form enables decentralized processing by providing sufficient interference information in a compact format that can be processed locally at each base station without centralized coordination.
3Quantity of substance
If hard bit decisions are transmitted between base stations, then data transfer volume is reduced, but reliability of cooperative demodulation deteriorates due to loss of reliability information
Solution Approach 1:
The patent changes the parameter being transmitted from hard bit decisions (discrete, lossy) to statistical expectation values (continuous, information-preserving). This parameter change maintains reliability information in the transmitted data while keeping the data volume manageable, achieving a balance between compression and information preservation that hard bit decisions cannot provide.
Data Source
AI summary
The invention relates to a method for eliminating interferences for an interconnected group of base stations of a mobile radio network when receiving data transmitted by mobile radio terminals in the mobile radio network, wherein a) the data are encoded at the mobile radio terminal device as symbols of a modulation alphabet, and modulated at a carrier frequency for transmitting, b) information regarding the symbols received at the base station of the interconnected group are transmitted between the base stations by means of communication connections for eliminating interferences, and c) the base stations of the interconnected group demodulate and decode the received symbols in a cooperative and decentralized manner.