Dual-Link eNodeB Communication for Backhaul Delay

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Solution Overview

Problem

Existing backhaul links in cellular networks, particularly between macro eNodeB and small cells, fail to meet the required delay needs for high-speed data transmission and interference coordination, leading to service disruptions and increased air interface overhead.

Innovation Solution

Establishing a second wireless link between eNodeBs via an existing wired link, allowing for the determination of the most suitable link for data transmission based on delay sensitivity and load conditions, using synchronization signals and security-related information to facilitate efficient communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a second wireless link is established between eNodeBs, then communication robustness and service continuity are improved, but device complexity and setup difficulty increase

Engineering Contradiction:

Improvecommunication robustnessVSAvoidlink management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent establishes a second wireless link between eNodeBs in advance before handover occurs. The link is pre-configured and activated so that when handover is needed, the connection can be immediately established without delay, ensuring service continuity and improving communication robustness during critical transitions.

Inventive Principle:

Principle #10Preliminary action

2Loss of time

If delay-sensitive signaling is transmitted over the air interface, then backhaul delay requirements are met, but air interface overhead increases

Engineering Contradiction:

Improvebackhaul delayVSAvoidair interface overhead

Core Design Contradiction:

Loss of timeVSLoss of information

Solution Approach 1:

The patent segments the signaling traffic into two paths: delay-sensitive signaling (such as handover commands and interference coordination messages) is transmitted over the wireless air interface between eNodeBs to meet strict delay requirements, while delay-tolerant data traffic is routed through the wired backhaul connection. This segmentation allows the system to meet timing constraints without overwhelming the air interface with all traffic types.

Inventive Principle:

Principle #1Segmentation

3Productivity

If small cells are densely deployed to increase data rates, then spectral efficiency improves, but handover failure probability increases

Engineering Contradiction:

Improvedata rateVSAvoidhandover success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces a direct wireless link between eNodeBs as an intermediary communication path. During handover in densely deployed small cell scenarios, this direct link enables fast exchange of handover signaling and coordination messages between source and target eNodeBs, reducing handover failure probability while maintaining the high data rates achieved through dense small cell deployment.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP2996428B1Link establishment method, base station, and system

Publication Date: 2019.11.13 ZTE CORP

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AI summary

Disclosed are a link establishment method, eNodeB and system, wherein the method includes: a first eNodeB and a second eNodeB establishing a second link via a first link between the first eNodeB and the second eNodeB; the first eNodeB and the second eNodeB communicating via the first link and/or the second link. In the link establishment method, eNodeB and system according to embodiments of the present invention, a second link is established between two eNodeBs via an existing first link, so that the two eNodeBs can communicate via the first link and/or the second link, thus meeting service needs and maximally saving air interface link resources.