US 2001/0019957 A1 · Handover method in mobile communication system

Abstract

In a mobile communication system having an ATM-processed transfer path, a non-instantaneous interrupt handover can be realized. In a mobile communication network including an ATM-processed transfer path, when a mobile station is moved between cells during communication, frames are received to be identified by a mobile switching center. The frames contain the same data received from both base stations covering the cell range at asynchronous timing different from each other. A selection is made of header information with the lowest error rate from the header information of these frames. The frames are connected at instructed timing. Also, the frames to be transmitted to a plurality of base stations are duplicated, and then transmission timing is specified from these header information. These duplicated frames are transmitted at the specified transmission timing, so that the non-instantaneous interrupt handover is carried out.

Claims7

Dependent claims

A switching center connected to a plurality of base stations, a plurality of said base stations communicated with a plurality of wireless stations, said switching center comprising:

a initiating unit which initiates a handover process operation in order that while any of said wireless stations is connected to a first base station, said any wireless station should be newly connected to a second base station irrelevant to said first base station;
a receiver unit receives a first packet, which is converted information from said wireless station into by said first base station, transmitted by said first base station and a second packet, which is converted information from said wireless station into by said second base station, transmitted by said second base station;
a buffer unit which temporarily stores said first packet and said second packet, which are received at asynchronous timing, so as to be synchronized with each other;
a calculating unit which calculates error rates of said first and second packets synchronized with each other;
a selecting unit which selects such an packet whose error rate is lower than that of the other packet;
and
a cutting out unit which cuts out the connection between said wireless station and said first base station when such a condition that the error rate of said second packet exceeds the error rate of said first packet becomes a normal condition.

4 more elements

Dependencies are inferred from the claim text.

Handover method in mobile communication system

Life of this patent

Handover method in mobile communication system

Life of this patent

Abstract

Claims7