Communication Device Joint Reception Log-Likelihood Ratio Management
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Solution Overview
Problem
In multi-AP communication systems, existing technologies face challenges in improving communication quality due to frequency synchronization errors, decreased effective rates from high transmission rates, and inefficient data sharing between access points, particularly in LLR Combining schemes where log-likelihood ratios are not appropriately combined across different APs.
Innovation Solution
The proposed solution involves generating and transmitting specific information regarding the likelihood of reception signals, information amounts, and request schemes for joint reception and log-likelihood ratio calculation between access points, allowing for optimal data storage and combination, thereby improving communication quality by designating threshold values for log-likelihood ratio resolution and notification ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If joint reception is performed with multiple access points, then communication quality is improved, but device complexity and coordination overhead increase
Solution Approach 1:
The patent segments the joint reception process into distinct functional components: likelihood information generation at each AP, information amount calculation, and selective transmission to the central AP. This segmentation reduces coordination overhead by allowing independent processing at each AP while maintaining collaborative benefits.
Solution Approach 2:
The patent performs preliminary calculations of information amounts and likelihood information before actual joint reception processing. This allows the system to pre-determine which APs need to transmit their likelihood information, reducing real-time coordination complexity while maintaining communication quality improvements.
2Productivity
If high transmission rates are used in multi-AP systems, then peak rates are improved, but effective rates decrease due to synchronization errors and overhead
Solution Approach 1:
The patent dynamically adjusts transmission parameters including likelihood information resolution and transmission timing based on calculated information amounts. This allows the system to optimize for effective rate by adapting parameters to actual channel conditions and AP capabilities, rather than using fixed high transmission rates that cause synchronization issues.
Solution Approach 2:
The patent implements feedback mechanisms where each AP reports its information amount capabilities and reception signal quality to the central AP. This feedback enables the central AP to adjust transmission rates and coordination strategies to maintain high effective rates while achieving peak rate improvements through joint reception.
3Reliability
If comprehensive likelihood information is transmitted between access points, then communication quality improves, but data sharing overhead increases
Solution Approach 1:
The patent extracts and transmits only the essential likelihood information needed for joint reception decoding, rather than transmitting complete reception signal data. By calculating and transmitting only the information amount required for effective decoding, the system reduces data sharing overhead while maintaining communication quality improvements from joint reception.
Solution Approach 2:
The patent allows each AP to generate and transmit likelihood information with different resolutions and formats optimized for their specific reception conditions and capabilities. This local optimization reduces overall data overhead by avoiding uniform high-resolution transmission from all APs, while still achieving effective joint reception through the combined information.
Data Source
AI summary
The present technology relates to a communication device enabling improvement of communication quality. A communication device includes a control unit configured to, in performing joint reception with a first communication device on a reception signal from one or more second communication devices, perform control of: generating first information indicating likelihood information of the reception signal for every second communication device; generating second information regarding an information amount of the first information that can be stored in a storage unit configured to temporarily store the likelihood information; and transmitting the first information and the second information to the first communication device. The present technology can be applied to, for example, a device constituting a wireless LAN system.