Wireless Handover via Layer 3 Signaling for Seamless BETH
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Solution Overview
Problem
The existing wireless communication system using Mobile IPv6 and IEEE802.11 struggles with establishing Bi-directional Edge Tunnel Handover (BETH) due to lack of notification from the Mobile Node (MN) to the Access Router (AR) when MN determines a new subnetwork for handover, as IEEE802.11 does not define a signal for such notification, and altering its specification is not feasible.
Innovation Solution
The system employs layer 3 (L3) level communication for the MN to notify the AR of the next subnetwork it intends to connect to, using signals like RtSolPr, allowing the AR to establish a Bi-directional Edge Tunnel (BET) before the MN connects to the new access point, ensuring seamless handover and data routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IEEE802.11 is used between MN and AP for handover, then wireless communication compatibility is improved, but the ability to establish BETH is worsened because IEEE802.11 does not define notification signals from MN to AR
Solution Approach 1:
The patent introduces the AR as an intermediary entity that receives handover notification from MN via L3 signaling and uses this information to establish BETH between ARs. The AR mediates between the MN's autonomous handover decision (IEEE802.11) and the network-side BETH establishment requirement (Mobile IPv6), solving the compatibility issue without modifying either standard.
2Speed
If MN autonomously determines next subnetwork for handover, then handover speed is improved, but the AR cannot know about the handover and establish BETH
Solution Approach 1:
The patent adds a new dimension of L3 signaling communication between MN and AR, separate from the traditional L2 IEEE802.11 handover process. This allows MN to notify AR of handover intentions through a different communication layer, preserving the speed benefits of autonomous handover while enabling network-side awareness for BETH establishment.
3Ease of operation
If BETH is established before MN connects to new AP, then handover smoothness is improved, but requires AR to know about next subnetwork which IEEE802.11 does not provide
Solution Approach 1:
The patent makes the AR serve multiple functions: it acts as both the access point for wireless communication (IEEE802.11) and the network controller for BETH establishment (Mobile IPv6). By consolidating these functions in the AR, the system can use existing signaling mechanisms for both purposes without adding complex separate protocols.
Data Source
AI summary
A mobile node (MN) 100 selects an AP 302 in a subnetwork 300 as the next AP to which it is wirelessly connected, while it is present within a cell 203 corresponding to a subnetwork 200 and wirelessly connected to an AP 202 in the subnetwork 200. The MN 100 transmits data indicating a request for BETH and the next AP to which it is wirelessly connected to an AR 201 via L3 level communication, while the MN 100 is present within the cell 203. The AR 201 implements establishment of a BET between an AR 301 in the subnetwork 300 and itself. As a result, the MN 100 can still use a care of address adapted to the subnetwork 200 even after it is wirelessly connected to the subnetwork 300.