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www.patentstorm.us/patents/7139254/description.html

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Posted by crouse

BCCH basically conveys information about the PBCCH to the Mobile station i.e it exists or not.And its not mandatory to implement PBCCH.

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Posted by HamidAliKhan

The PBCCH is used to broadcast GPRS-related system information about a cell to all the GPRS-enabled MSs that are currently camping on that cell. ...for more details
www.wireless-center.net/Wireless-Internet-Technologies-and-Applications/1847.html - 40k -

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Posted by waqasahmad

The BCCH basically conveys information about
the PBCCH to the Mobile station i.e it exists or
not.And its not mandatory to implement PBCCH.

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Posted by sagitraz

FIELD OF THE INVENTION

The invention relates to packet data services of wireless telecommunications systems and especially to transmitting connection set-up parameters on broadcast control channels.

BACKGROUND OF THE INVENTION

The progress in wireless data transmission has more and more brought forth the need to transmit wirelessly not only calls but also different data applications. The circuit-switched connections used conventionally in mobile systems are, however,rather poorly suited for transmitting different burst-type data services, which is why packet-switched applications have also been developed for mobile systems. During the past few years, GSM 2+ phase standards, in which the new packet-switched datatransmission service GPRS (General Packet Radio Service) is also defined, have been drafted for the European digital GSM (Global System for Mobile communication) mobile network, for instance. GPRS is a packet radio network utilizing the GSM network,which endeavors to optimize data packet transmission by means of GPRS protocol layers on the air interface between a mobile station and a GPRS network.
The GSM system comprises several different, typically unidirectional control channels, by means of which the network controls the operation of mobile stations. One such channel is the broadcast control channel BCCH, through which information istransmitted on the different cells of the network, such as identification information of the cell, identification information on the network, frequencies used in the cell, etc. Each base transceiver station BTS transmits information on a cell on abroadcast control channel of its own, to which all mobile stations in the area of the cell listen.

Correspondingly, specific control channels have also been designed for the GPRS system, one of which is the packet broadcast control channel PBCCH, whose task is to transmit system information to all GPRS mobile stations in the cell; just likeBCCH does in the GSM network. When a GPRS mobile station is in idle mode, no data transmission resources have been allocated to it and it only listens to the broadcast control channel BCCH and the paging control channel PCH of the cell, or to the packetbroadcast control channel PBCCH and the packet paging control channel PPCH, if the cell supports this GPRS control channel. If the cell does not support this PBCCH channel, which will be a very common situation when GPRS networks will be built on top ofthe GSM network, the GPRS mobile station listens to the GSM broadcast control channel BCCH. The used broadcast control channel, PBCCH or BCCH, is thus defined according to which broadcast control channel is available at each time in the cell of the GPRSmobile station.
A GPRS mobile station should thus support broadcast control channel reception on both the PBCCH channel and the BCCH channel. Then, if the cell uses the PBCCH channel, the network transmits the parameters used in the GPRS network to the mobilestations on said PBCCH channel only.

A problem with the arrangement described above is that if the GPRS mobile station cannot correctly receive system information transmitted on the PBCCH channel, it also cannot transmit or receive data packet transmissions according to GPRS. Inthe near future, when GSM networks will be updated to also support GPRS packet data services, a great risk exists that GPRS mobile stations which came out on the market before the PBCCH channel came to the networks will not work on the PBCCH channels tobe built into the networks in the future, because it has not been possible to test them in field conditions. Thus, there also exists a great risk that GPRS mobile stations which came out on the market before the GPRS service was initiated will not workin the GPRS network after the PBCCH channels are taken into use in the new networks. The extremely significant drawback in this is that circuit-switched speech services will not work, either, in such GPRS mobile stations.
A GPRS mobile station should thus support broadcast control channel reception on both the PBCCH channel and the BCCH channel. In accordance with the above, if the cell uses the PBCCH channel, the network transmits the parameters to be used in aGPRS connection to the mobile stations only on said PBCCH channel. On the other hand, if the GPRS mobile station cannot receive correctly system information transmitted on the PBCCH channel, neither can it transmit or receive a data packet transmissionaccording to GPRS. In such a case, using voice services may also be prevented. When the updating of GSM networks is started in the near future so as to make them also support the GPRS packet data service, but only on the BCCH and CCCH channels, a veryhigh risk exists that GPRS mobile stations which came out on the market at the initial stage of the GPRS service will not work on the PBCCH channels to be built later into the network, since it has not been possible to test them in field conditions.

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Posted by jahangir1983