Ericsson Gmbh

Telefonaktiebolaget Lm Ericsson (Publ)

John Mark Freeze

Henrik Nyberg

Randall Glenn Bright

Olof Tomas Backstrom

Ronald L Bexten

Tomas &Ouml;stman

Cellular radiotelephone systems and methods communicate with cellular radiotelephones via multiple base stations. Radiotelephone traffic channels are used by the base stations for radiotelephone communications with the telephones. A common control channel is transmitted by the base stations, to control radiotelephone communications with the radiotelephones over the radiotelephone traffic channels. The common control channel is transmitted by a first one of the base stations over a first radio frequency and is transmitted by a second one of the base stations over a second radio frequency that is different from the first radio frequency. By providing a common control channel, excess control channel capacity can be reduced, thereby conserving control channel radio spectrum. Moreover, by transmitting the common control channel using multiple radio frequencies, the radio frequencies can be selected to reduce and preferably eliminate interference.

Cellular radiotelephone systems and methods that broadcast a common control channel over multiple radio frequencies

A method is provided for controlling handoff of communications with a mobile station from a first radio transceiver to a second radio transceiver in a communication system having a common baseband processing unit operably connected to each of the radio transceivers. In one form, the method includes the steps of maintaining respective first and second voice paths with modulated signals uplinked from the first and second radio transceivers to the common baseband processing unit while communications with the mobile station are handed off from the first radio transceiver to the second radio transceiver.

Method of controlling handoff of communications with a mobile station from a first radio transceiver to a second radio transceiver

An air frame synchronisation signal is transmitted as a data signal over a PCM link from a central unit to a plurality of remote radio transceivers, allowing the remote radio transceivers to recreate the AFS signal with the desired accuracy, compensating for transmission delays.

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Raleigh, NC, United States of America

John Mark Freeze