61 results about "Handoff latency" patented technology

A method for minimizing handoff latencies when a handoff is performed in a wireless network. An access point (AP) or base station associated to a current wireless station (STA) allows information required for a reassociation to the STA to be propagated to handoff-capable neighboring APs or base stations. When the STA moves, a neighboring AP or base station performs the reassociation to the STA on the basis of context. When a handoff procedure is performed, the time taken to receive context of a corresponding STA is reduced, such that a fast handoff can be implemented.

A method for minimizing handoff latencies when a handoff is performed in a wireless network. An access point (AP) or base station associated to a current wireless station (STA) allows information required for a reassociation to the STA to be propagated to handoff-capable neighboring APs or base stations. When the STA moves, a neighboring AP or base station performs the reassociation to the STA on the basis of context. When a handoff procedure is performed, the time taken to receive context of a corresponding STA is reduced, such that a fast handoff can be implemented.

In the public WLAN systems, reliable user re-authentication for mobility support is an essential step. However, re-authentication during handoff procedures causes long handoff latency which deteriorates the quality of service specifically for real-time multimedia applications. One possible solution is to authenticate the Mobile Node (MN) in advance with all the neighboring Access Points (APs) and distribute the Session Keys to them. However, the key issue is how to optimally and efficiently select the neighboring APs. In the preferred embodiments, we propose a system that takes into account the user current “Geo-Location”, “Mobility Pattern” and “Application Running on MN”; estimates the “Expected Mobility Zone” (EMZ) and selects an appropriate set of candidate APs corresponding to the MN's geo-location. The EMZ may comprise of APs belonging to “Intra-domain”, “Inter-domain” or “Inter-technology Networks” (e.g., WLAN, WiMAX, and Cellular etc). The system assumes that not only the Mobile Nodes but also the Fixed Nodes (APs or Base Stations) are capable of knowing their Geo-Location Coordinates X, Y, Z. This capability may come either by integrating GPS receiver or through any other alternate, state of the art or future positioning technologies in the APs.

Embodiments of the present invention includes a handover processing method, a source eNB, a neighboring eNB and a network communication system. In one embodiment of the handover processing method, a source eNB selects a target eNB from neighboring eNBs that can accept a handover request from a mobile terminal, and notifies a selection result to the mobile terminal; if handover information corresponding to the mobile terminal is received by an neighboring eNB that can accept the handover request of the mobile terminal within a preset handover waiting time, the neighboring eNB determines that it is a target eNB and cooperates with the mobile terminal to perform a handover; otherwise, the neighboring eNB determines that it is a prepared eNB and reduces its resources reserved for the mobile terminal. The present invention can effectively improve the successful handover probability.

The invention discloses medial source fast switching method. It includes the following steps: receiving the request information of medial source switching to the flow medial server; switching the request into destination media source and transmitting it to client side by current dialog and media communication channel resource which doesn't be released in request sending. Thus it can greatly reduce waiting time for media resource switching operation, make up the defect in current technique.

An apparatus dynamically assigns external home agent (HA) for VPNs and a method for the same is proposed. The apparatus establishes VPN between an internal network and at least one external network, whereby a mobile node (MN) can roam in the external network with security. The external HA closest to the MN in the visited external network is selected for mobility management of the MN. The MN only needs to register with the same external HA when roaming in the same external network. The handoff latency and end-to-end latency for a roaming MN, therefore, could be reduced significantly. It will also not reestablish the IPsec tunnel within the same external network.