Interference Removal via Stored Binary Comparison in LTE Terminals
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Solution Overview
Problem
In 3GPP LTE networks, the increasing interference from small cells in heterogeneous networks hampers the reception quality, necessitating an effective interference cancellation method to enhance the reception capability.
Innovation Solution
An interference-removed reception method is implemented, where previously stored information from an aggressor cell is encoded and compared with new data on the physical channel, allowing interference removal using the encoded binary if the cyclic redundancy check (CRC) matches, thereby enabling signal reception from a serving cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed in heterogeneous networks to increase network capacity, then network coverage and capacity are improved, but interference to serving cell reception increases
Solution Approach 1:
The patent converts the harmful interference signal from the aggressor cell into a beneficial resource by decoding and re-encoding the interference signal to generate an accurate interference replica, which is then subtracted from the received signal to cancel the interference and improve serving cell reception
2Reliability
If interference cancellation processing is performed to improve reception quality, then reception capability is improved, but processing complexity increases
Solution Approach 1:
The patent performs preliminary action by storing system information from the aggressor cell in advance and updating only changed portions (such as SFN every 40ms) rather than re-decoding entire signals, which reduces processing complexity while maintaining interference cancellation effectiveness
Solution Approach 2:
The patent applies partial action by performing interference cancellation only on specific physical channels (PBCH, PDSCH) where interference is most problematic, and by updating only the necessary portions of stored information rather than processing all data, thereby reducing overall processing complexity
Data Source
AI summary
One embodiment of the present specification provides an interference-removed reception method. The interference-removed reception method may comprise the steps of: encoding, in a binary in a physical channel, stored information for an attacker cell which causes interference; performing a comparison between the encoded binary and a new binary in the physical channel received from the attacker cell; and if the binaries match, removing interference caused by the new binary in the physical channel received from the attacker cell by using the encoded binary, and thereby receiving a signal from a serving cell.