Gustavo A Serena

US Patent:

6898212, May 24, 2005

Filed:

Nov 14, 2000

Appl. No.:

09/713778

Inventors:

Dexter Chun - San Diego CA, US
Manoj Deshpande - San Diego CA, US
Steve Hicks - San Diego CA, US
Bob Knight - San Diego CA, US
KC Lee - San Diego CA, US
Ravi Palakodety - San Diego CA, US
Ramesh Ramaswamy - San Diego CA, US
Gustavo Serena - San Diego CA, US
Dave Walker - Escondido CA, US
Jun Zhang - San Diego CA, US

Assignee:

Telefonaktiebolaget LM Ericsson (publ)

International Classification:

H04J003/06

US Classification:

370503, 370547

Abstract:

A Base Station Controller (BSC) that reduces the occurrence of audible noise in a Code Division Multiple Access (CDMA) radio network is provided. The BSC according to one embodiment of the present invention comprises a Media Stream Board (MSB) for compressing groups of 160 PCM speech samples from a Public Switch Telephone Network (PSTN) into vocoded frames, and a Special Purpose Board (SPB) for reformatting the vocoded frames from the MSB into over-the-air CDMA vocoded frames. The MSB and SPB each have a local timer that is slave to “PSTN time”. The BSC further comprises a Timing Unit Board (TUB) connected to a GPS receiver. The TUB receives “GPS time” from the GPS receiver. The TUB generates timing cells, each containing time-of-day information according to “GPS time”. The TUB distributes the timing cells to the MSB and the SPB over an Asynchronous Transfer Mode (ATM) network. The MSB and SPB use the received timing cells to compare their local timer, which tracks “PSTN time”, to “GPS time”.