Multi-RAT Backhaul Interface for Heterogeneous Network Handovers
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Solution Overview
Problem
Current mobile networks lack a standardized backhaul interface for handovers between base stations operating different radio access technologies (RATs), limiting the ability to efficiently manage mobility and bandwidth distribution across multiple RATs, particularly when legacy RATs decline and new RATs require additional bandwidth.
Innovation Solution
The implementation of a multi-RAT backhaul interface enables communication and handover management between base stations of different RATs, allowing for the aggregation of carriers and efficient bandwidth distribution by establishing a backhaul interface between nodes of different radio access technologies, such as LTE and HSPA, to support multi-RAT carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a backhaul interface is established between base stations of different RATs, then mobility management and bandwidth distribution are improved, but device complexity and system architecture complexity increase
Solution Approach 1:
The patent introduces a backhaul interface that acts as an intermediary communication channel between base stations of different RATs (e.g., LTE and HSPA). This interface enables direct coordination and information exchange between heterogeneous base stations, facilitating seamless handovers and load balancing without requiring core network intervention for each mobility event, thus improving mobility management efficiency while maintaining manageable system complexity.
2Power
If carrier aggregation across multiple RATs is implemented, then peak data rates and bandwidth utilization are improved, but device complexity and protocol stack complexity increase
Solution Approach 1:
The patent implements a universal backhaul interface design that can handle multiple RATs (LTE, HSPA, and future RATs) through a common architecture. This multi-functional interface supports carrier aggregation across different RATs by providing unified protocols and procedures, enabling base stations to aggregate carriers from heterogeneous RATs to achieve higher peak data rates while avoiding the need for separate dedicated interfaces for each RAT combination, thus controlling protocol stack complexity.
3Adaptability or versatility
If handover between different RATs is enabled, then network adaptability and spectrum utilization are improved, but handover management complexity and signaling overhead increase
Solution Approach 1:
The patent enables base stations to perform self-service handover management by directly exchanging handover-related information and making handover decisions through the backhaul interface. Base stations autonomously evaluate handover conditions, select target base stations, and execute handovers without requiring complex core network control for each handover event. This self-service mechanism improves network adaptability to varying traffic conditions and spectrum availability while reducing handover management complexity at the network control plane.
Data Source
AI summary
A method and apparatus for mobility management, load management, sharing management and configuration update and setup in a mobile network having a first radio access technology node and a second radio access technology node, the first radio access technology node and the second radio access technology node communicating over a backhaul interface. In one aspect the method detects, at the first radio access technology node, that a handover for a user equipment to a new node is required; provides, from the first radio access technology node, handover information to the second radio access technology node over the backhaul interface; and performs the handover of the user equipment from the first radio access technology node to the new node.