At&t Mobility II LLC

Cingular Wireless Ii, LLC

John Carvalho

Mark D Austin

Daryl Robert Gazzard

Ayman A Mostafa

Prabha Aithal

In a cellular communications system having a centralized radio processing portion (a base station hotel) in communication with a plurality of remote air interface radio portions (or radio heads) over a transport medium, the centralized radio processing portion compensates for a fixed delay associated with the transport medium coupling the centralized radio processing portion and one of the remote air interface radio portions when evaluating a time period corresponding to a variable delay between transmission by a mobile in communication with the one of air interface radio portions and receipt of the transmission by the centralized radio processing portion. The variable delay may relate to time out periods or time slot synchronization.

Method and apparatus to maintain network coverage when using a transport media to communicate with a remote antenna

The present invention is directed to a system and method for providing improved wireless services in a GPRS network operating in network operation mode. In an embodiment of the present invention, a MS attempts a combined attach. If the combined attach is not accepted by the network, the MS repeats the attempt. If the combined attach is not accepted by the end of the second attempt, the MS attempts to gain access only to GSM services. Once the MS gains access to the GSM services, the MS may attempt the combined attach while connected to GSM network.

Selective retry of attach and location update procedures

The present invention provides enhanced GSM network selection process. The present utilizes a LAC, along with unique selection files, in selecting a network service provider, thus providing granularity in network selection process. A mobile first searches for a home network LAC. If the mobile finds a home network LAC, the mobile then attempts to perform a location update on the home network LAC. If not, the mobile searches for a preferred network LAC. If the mobile does not find a preferred network LAC, the mobile than searches for a preferred network PLMN.

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Slough, United Kingdom

John Carvalho