NAICS Receiver Interference Suppression via Codebook Restriction
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Solution Overview
Problem
In cellular communications networks, particularly in LTE networks, there is a challenge in reducing the complexity and improving the reliability of blind detection of interference parameters for Network Assisted Interference Cancellation and Suppression (NAICS) receivers, especially when dealing with multiple Common Reference Signal (CRS) ports, which increases the number of precoding matrices and complicates interference suppression.
Innovation Solution
The system provides assistance information to wireless devices, including an identity for generating a reference signal and transmission constraints such as spatial multiplexing rank restrictions and precoding matrix restrictions, to reduce the complexity of detecting interference parameters, allowing for more efficient suppression of interfering physical channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of CRS ports is increased to support more spatial multiplexing layers, then the network capacity and data rate are improved, but the blind detection complexity and reliability degradation occur
Solution Approach 1:
The network performs preliminary action by determining and signaling the codebook subset restriction before the UE performs blind detection. This pre-configured restriction limits the precoding matrix options to a manageable subset, allowing the UE to efficiently suppress interference from multi-layer transmissions without facing exponential complexity growth
Solution Approach 2:
The invention changes the parameter space by restricting the codebook subset. Instead of searching through all possible precoding matrices in the full codebook, the UE only searches within a restricted subset signaled by the network. This parameter restriction transforms an intractable blind detection problem into a manageable one, enabling reliable interference suppression even with 4 or more CRS ports
2Measurement precision
If the full codebook of precoding matrices is used for interference suppression, then the interference cancellation accuracy is improved, but the computational complexity and power consumption increase significantly
Solution Approach 1:
The invention extracts only the necessary precoding matrices from the full codebook that are relevant for interference suppression. By signaling a codebook subset restriction, the network enables the UE to extract and process only those specific precoding matrices that are actually used for interfering transmissions, rather than processing the entire codebook. This extraction approach maintains interference cancellation accuracy while dramatically reducing computational complexity and power consumption
3Reliability
If blind detection is performed without codebook subset restriction, then the reliability of interference parameter detection is improved, but the detection time and complexity increase
Solution Approach 1:
The network performs preliminary action by signaling the codebook subset restriction in advance, which pre-configures the search space for blind detection. This preliminary information reduces the detection time by eliminating unnecessary precoding matrix candidates from the search, while maintaining reliability through assisted detection mechanisms that guide the UE toward the correct interference parameters more efficiently
Data Source
AI summary
Systems and methods relating to assisting a wireless device with suppression of an interfering physical channel during reception of a desired physical channel are disclosed. In some embodiments, a method of operation of a wireless device to assist with suppression of an interfering physical channel during reception of a desired physical channel comprises receiving assistance information for an interfering physical channel and receiving a desired physical channel while suppressing the interfering physical channel according to the assistance information for the interfering physical channel. The assistance information comprises an identity used to generate a reference signal associated with the interfering physical channel and information indicative of one or more transmission constraints on transmission of the interfering physical channel, the one or more transmission constraints comprising a spatial multiplexing rank restriction and/or a precoding matrix restriction.