Handover in Multi-Cell Integrated Networks
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Solution Overview
Problem
In multi-cell integrated networks, handovers between 3GPP and WLAN connections often fail to adequately account for anchored WLAN connections, leading to disruptions during UE movement between ISW systems.
Innovation Solution
The implementation of a handover process that prioritizes 3GPP mobility protocols over X2 interfaces, facilitating simultaneous inter-WLAN and inter-eNB handovers by transferring WLAN context information within 3GPP management protocols, ensuring seamless transitions by including WLAN context details such as identifiers, QoS, and security contexts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate handover procedures are used for 3GPP and WLAN connections, then each connection can be managed independently, but the anchored WLAN connection is not adequately accounted for during handovers
Solution Approach 1:
The patent combines 3GPP and WLAN handover procedures into a unified process where the eNB coordinates both handovers simultaneously. The target eNB receives both 3GPP handover request and WLAN context information, enabling synchronized execution of both connection types through a single coordinated procedure rather than separate independent procedures.
Solution Approach 2:
The eNB is designed to perform multiple functions: it manages both 3GPP cellular connections and WLAN connections, acts as an anchor point for WLAN connections, and coordinates inter-eNB handovers while simultaneously handling WLAN context transfer. This multi-functional capability allows a single node to handle diverse connection types through unified protocols.
2Productivity
If WLAN context information is transferred separately from 3GPP handover, then WLAN handover can be optimized independently, but disruptions occur during UE movement between ISW systems
Solution Approach 1:
The source eNB prepares and includes WLAN context information in the handover request message before the handover is executed. The target eNB receives and processes this WLAN context information in advance during the handover preparation phase, enabling the WLAN connection to be seamlessly transferred without disruptions during the actual handover execution.
Solution Approach 2:
The 3GPP handover request message serves as an intermediary carrier that transports WLAN context information from the source eNB to the target eNB. This message structure acts as a mediator that bundles both 3GPP and WLAN handover data together, ensuring coordinated transfer of both connection types through a single communication channel.
3Reliability
If 3GPP and WLAN handovers are coordinated through a unified protocol, then seamless transitions are achieved, but the protocol complexity increases
Solution Approach 1:
The X2 interface handover request message is designed to carry both 3GPP handover information and WLAN context information simultaneously. This universal message structure enables a single protocol to handle multiple connection types without requiring separate specialized protocols, reducing overall system complexity while achieving seamless transitions.
Solution Approach 2:
The patent merges 3GPP and WLAN handover signaling into a single coordinated message exchange between eNBs. By combining both handover types in one unified protocol flow with a single handover request and acknowledgment exchange, the solution reduces protocol complexity compared to maintaining separate independent signaling procedures for each connection type.
Data Source
AI summary
Embodiments of the present disclosure describe methods, systems, and devices for handover in multi-cell integrated networks. Various embodiments may include transmission of WLAN context information and/or target WLAN information in evolved universal terrestrial radio access network (EUTRAN) handover messages. Other embodiments may be described and/or claimed.