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Download QoS in Integrated 3G Networks by Robert Lloyd-Evans PDF

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By Robert Lloyd-Evans

This cutting edge source is a hands-on, operating advisor and outline of ways varied elements of an built-in 3G cellular community impact caliber.

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Extra resources for QoS in Integrated 3G Networks

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Yuan, Turbo Codes: Principles and Applications, Boston, MA: Kluwer Academic Publishers, 2000. , Digital Modulation Techniques, Norwood, MA: Artech House, 2000. 1 Nature and Principles TE WCDMA is the version of DS-CDMA proposed by the 3GPP to meet the needs of the UMTS defined by IMT-2000. Under the banner of WCDMA there are actually two different standards, WCDMA-FDD and WCDMATDD. They both use a common network architecture and differ primarily at the physical level. The specifications have evolved through a series of releases.

By way of illustration, a completely unencoded message would have d = 1 and so not be able to detect or correct any errors at all. The simplest examples in data communications of the use of block codes are the parity checks and the cyclic redundancy check (CRC) at the end of HDLC frames. The additional parity bit attached to an unencoded block boosts the distance from 1 up to 2, so that one error can be detected, but none is corrected, whereas the larger CRC fields allow some correction in addition to detection.

Node B: This is the logical function of the base transceiver station (BTS) concerned primarily with the physical level functions. Higher-level control is directed by the RNC. A single Node B can support several cells. 1 UMTS architecture. External networks WCDMA 37 • Radio network controller (RNC): This is responsible for resource con- trol for one or more Node B, and for providing the interfaces to the core network. In general, the UTRAN will operate in more than one frequency band, each of which represents a different radio network subsystem (RNS) containing at least one Node B and at least one RNC.

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