Backhaul Overhead Reduction via Selective PMI Extraction
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Solution Overview
Problem
In LTE communication systems, the overhead related to precoding information and beamforming weight information transmitted over the backhaul is high, leading to increased traffic and reduced frequency usage efficiency due to the need to notify extended PMI lists for each frequency band, which is particularly problematic in carrier aggregation scenarios.
Innovation Solution
A communication apparatus and method that generate and transmit frequency resource position information indicating the validity or invalidity of precoding information based on communication quality, allowing only necessary minimum PMI information to be autonomously selected and shared between nodes, reducing overhead while maintaining inter-cell interference reduction effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extended PMI lists are transmitted for each frequency band to maintain inter-cell interference coordination, then interference reduction effectiveness is improved, but backhaul overhead increases
Solution Approach 1:
The patent extracts and transmits only the essential elements of PMI information (such as codebook index, number of layers, and precoding matrix indicator) rather than complete extended PMI lists for each frequency band. This selective extraction maintains interference coordination effectiveness while significantly reducing backhaul overhead by eliminating redundant information transmission.
Solution Approach 2:
The PMI information is segmented into critical components (codebook index, number of layers, PMI) that are transmitted separately. This segmentation allows the system to transmit only necessary information elements rather than complete PMI lists, reducing backhaul overhead while preserving the essential data needed for inter-cell interference coordination.
2Measurement precision
If complete PMI information is shared between nodes, then beamforming accuracy is improved, but frequency usage efficiency decreases due to increased overhead
Solution Approach 1:
The patent extracts only the essential beamforming parameters (codebook index, number of layers, and PMI) needed to achieve accurate beamforming. By transmitting only these critical elements rather than complete PMI information, the system maintains beamforming accuracy while reducing overhead, thereby improving frequency usage efficiency.
3Reliability
If detailed precoding information is transmitted over backhaul, then coordinated beamforming performance is improved, but traffic load increases
Solution Approach 1:
The patent extracts and transmits only the necessary precoding information elements (codebook index, number of layers, and PMI) required for coordinated beamforming. This selective transmission maintains beamforming performance while significantly reducing backhaul traffic by eliminating redundant and non-essential data.
Solution Approach 2:
The precoding information is segmented into essential components that are transmitted separately. This segmentation enables the system to transmit only the necessary data elements for coordinated beamforming, reducing backhaul traffic load while preserving performance.
Data Source
AI summary
A communication apparatus comprises a generator that generates frequency resource position information corresponding to a first information which is based on the communication quality information received from user equipments, the frequency resource position information indicating validity or invalidity of the first information for each frequency resource, and a transmitter that transmits the first information, the frequency resource position information and a cell ID which the frequency resource position is applied, to another communication apparatus via a backhaul.