H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/26 (2006.01) H04Q 7/38 (2006.01) H04Q 7/36 (2006.01)
Patent
CA 2109116
A mobile telephone system has in a cell (C1) a base station (BS1) and sub-stations (MT1, MT2, MT3) which are connected to a mobile switching central (MSC) by means of cables (2). The mobile telephone system has control channels (CC) and frequencies which are time divided to traffic channels. Some of the frequencies are selected as identification frequencies. Each of the sub-stations (MT1, MT2, MT3) is assigned a unique set of frequencies from among the identification frequencies and constantly transmit their respective frequency set. A mobile station (MS) connected to the base station (BS1) listens to the identification frequencies and reports the strongest of these frequencies to the mobile switching central (MSC). The mobile switching central compares the reported frequencies with the unique set of frequencies, compares the reported signal strength with a threshold value and selects the nearest sub-station (MT2) for handoff. The mobile switching central (MSC) switches from the base station (BS1) to a connection (4) with the sub-station (MT2). The mobile station (MS) continues to listen to the identification frequencies and reports the signal strength on its connection (4). When the strength of the signals from the selected sub-station (MT2) is low, the connection (4) is switched back to the base station (BS1).
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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