X2 Signaling Load Information Elements for CoMP Interference Coordination
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Solution Overview
Problem
Current X2 signaling in wireless communication systems fails to effectively support centralized and distributed multi-eNB cooperation with non-ideal backhaul, particularly in CoMP transmission, leading to inadequate interference coordination.
Innovation Solution
The introduction of relative narrowband beam, scheduling, transmission power, and resource restriction information elements via X2 signaling to facilitate interference-aware scheduling and resource allocation between base stations, including adding a central node identifier for resource allocation requests, enhances X2 signaling to support coordinated multiple point transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing X2 signaling is used for multi-eNB cooperation, then system complexity is kept low, but interference coordination capability is insufficient
Solution Approach 1:
The patent segments load information into multiple specialized information elements: RNTP for power control, RNB for beam management, RNS for scheduling coordination, and RNR for resource restriction. This segmentation allows each IE to address specific interference coordination aspects independently, improving coordination capability while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces new parameters within information elements to enhance interference coordination. For example, RNTP includes per-PRB power values, RNB includes beam-specific restrictions, and RNS includes scheduling timing parameters. These parameter changes enable precise control over interference without fundamentally redesigning the entire signaling structure.
2Productivity
If centralized scheduling with ideal backhaul is assumed, then resource allocation efficiency is improved, but applicability to non-ideal backhaul scenarios deteriorates
Solution Approach 1:
The patent enables dynamic resource allocation by allowing eNBs to exchange load information and adjust their resource allocation decisions in real-time based on current network conditions. The load indication procedure allows continuous updates of RNTP, RNB, RNS, and RNR parameters, enabling the system to adapt to changing backhaul conditions while maintaining efficient resource allocation.
Solution Approach 2:
The patent allows each eNB to make localized resource allocation decisions based on locally received load information from neighbors. Each eNB can independently adjust its power, beam, scheduling, and resource restrictions based on the specific interference conditions it experiences, rather than requiring centralized control for all decisions.
3Reliability
If broad load information is transmitted between base stations, then interference coordination coverage is improved, but signaling overhead increases
Solution Approach 1:
The patent divides comprehensive load information into four distinct information elements (RNTP, RNB, RNS, RNR), each addressing a specific aspect of interference coordination. This segmentation allows receiving eNBs to process only the relevant IEs for their current needs, reducing effective processing overhead while maintaining comprehensive coordination coverage.
Solution Approach 2:
The patent allows eNBs to transmit only the necessary subset of information elements based on current network conditions and coordination needs. Not all IEs need to be transmitted in every load indication message; eNBs can selectively include only the relevant parameters, reducing signaling overhead while maintaining adequate coordination coverage.
Data Source
AI summary
The present disclosure provides a method and apparatus for X2 signaling. The method comprises, in a wireless communication network supporting coordinated multiple point transmission, transmitting load information from a first base station to at least one second base station via X2 signaling, wherein the load information comprises at least one item of i) a relative narrowband beam information element or ii) a relative narrowband scheduling information element. Current X2 signaling is enhanced to support coordinated multiple point transmission with non-ideal backhaul and improve interference coordination.