Essentials of UMTS by Christopher Cox

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By Christopher Cox

This concise consultant to UMTS presents a balanced, system-level procedure valuable to engineers, venture managers and advertising executives.

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Examples include its maximum data rate, the number of simultaneous data streams it can handle, and whether or not it supports GSM. On receiving this information, the SRNC replies with a message called UE capability information confirm (3). It now knows how it should control the mobile, for example whether it can hand the mobile over from UMTS to GSM. The procedures also define what happens in cases of abnormal behaviour. If, for example, a timer in the mobile expires before it receives the SRNC’s confirmation message, then it is obliged to retransmit its capability information.

Several proposals were submitted and, in 1999, the ITU selected five systems as being compatible with IMT-2000. After some years of evolution, four main systems remain. The subject of this book is the Universal Mobile Telecommunication System (UMTS). This system was developed from GSM, by keeping the core network more-or-less intact but changing the air interface to use CDMA. There is some compatibility between the two systems: most UMTS mobiles also implement GSM, and the network can hand them over from a UMTS base station to a GSM one if they reach the edge of the UMTS coverage area.

The name ‘Node B’ does not stand for anything in particular: it was introduced as a temporary name, but the name stuck. 3 Architecture of the radio access network in release 99. ) SYSTEM ARCHITECTURE The radio network controller is an intermediate component between the Node B and the core network. The RNC has three main functions, and an individual RNC can acquire up to three different names depending on which of these functions it is implementing. First, each Node B is controlled by a particular RNC, which is known as its controlling RNC (CRNC).

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