UE Cooperation LLR Forwarding With Selective Quantization
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Solution Overview
Problem
Existing user equipment (UE) cooperation methods in wireless networks require extensive bandwidth for forwarding log-likelihood ratios (LLRs), which is inefficient due to the high bandwidth demands, especially when each cooperating UE transmits one LLR for each encoded bit.
Innovation Solution
The proposed method selects and forwards only the most useful LLRs from cooperating UEs to a target UE, reducing the burden on device-to-device (D2D) links by exploiting frequency selectivity and quantizing LLRs to minimize the number of bits required for reliable forwarding, thereby optimizing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each cooperating UE transmits one LLR for each encoded bit, then the reliability of data reception is improved, but the bandwidth consumption increases significantly
Solution Approach 1:
The patent extracts and transmits only the most useful LLRs from cooperating UEs to the target UE, rather than transmitting all LLRs. This selective extraction reduces the quantity of transmitted data while maintaining the essential reliability information needed for successful decoding.
Solution Approach 2:
The patent changes the parameter of LLR transmission by quantizing LLRs to minimize the number of bits required. This parameter transformation reduces bandwidth consumption while preserving the critical information content of the LLRs for reliable data reception.
2Measurement precision
If all LLRs are forwarded from cooperating UEs, then the decoding accuracy is improved, but the time resources required increase
Solution Approach 1:
The patent extracts and forwards only the most useful LLRs that contribute most significantly to decoding accuracy. By selecting a subset of LLRs rather than forwarding all of them, the system maintains decoding accuracy while reducing the time required for LLR transmission and processing.
Solution Approach 2:
The patent applies partial action by transmitting only a portion of the available LLRs - specifically those that are most useful - rather than transmitting all LLRs. This partial transmission is sufficient to achieve the required decoding accuracy while minimizing time resource consumption.
3Reliability
If extensive bandwidth is allocated for LLR forwarding, then the reliability of cooperation is improved, but the overall system efficiency decreases
Solution Approach 1:
The patent extracts and transmits only the most useful LLRs, reducing the bandwidth required for LLR forwarding while maintaining cooperation reliability. This efficient use of bandwidth improves overall system productivity by freeing up resources for other transmissions.
Solution Approach 2:
The patent changes the LLR representation through quantization to minimize bits required, thereby reducing bandwidth consumption for LLR forwarding. This parameter transformation maintains cooperation reliability while improving system efficiency by reducing the resource overhead of UE cooperation.
Data Source
AI summary
An embodiment method includes receiving, by a first user equipment (UE), a message, for a second UE, transmitted over a plurality of resource blocks (RBs) on behalf of a communications controller and determining a plurality of log-likelihood ratios (LLRs) in accordance with the received plurality of RBs. The method also includes transmitting, a subset of the determined LLRs to the second UE.