Brzi paketni pristup

Data services and multimedia are expected to have significant growth over the next few years and will likely become the dominant source of 3G traffic. High Speed Downlink Packet Access (HSDPA) provides large enhancements over Wideband Code Division Multiple Access (WCDMA) for the downlink. HSDPA was standardized as part of Third Generation Partnership Project (3GPP) Release 5 and improved in later releases. The HSDPA peak date rate available in the terminals was initially 1.8 Mbps, but it has increased to 42 Mbps. HSDPA has been designed to increase downlink packet data throughput by means of fast physical layer retransmission and transmission combining as well fast link adaptation controlled by the Node B – i.e. a base transmission station (BTS). High Speed Uplink Packet Access (HSUPA) was part of 3GPP Release 6 with the first specification version in December 2004. The HSUPA peak data rate in the initial phase is expected to be 1–2 Mbps with later phase pushing the data rate to 11.5 Mbps. HSDPA and HSUPA together form High Speed Packet Access (HSPA).Očekuje se da će podatkovne usluge i multimedija imati značajan rast te će vjerojatno postati dominantan izvor 3G prometa u sljedećih nekoliko godina. Brzi paketski pristup u silaznom smjeru (HSDPA) pruža veliko unaprjeđenje u usporedbi sa na širokopojasnim višestrukim pristupom po kodnoj raspodjeli (WCDMA) za silazni smjer. HSDPA je normiran kao Release 5 od strane 3GPP te je unaprjeđivan u daljnjim izdanjima. U početku je raspoloživa brzina prijenosa podataka u korisničkim uređajima iznosila 1,8 Mbit/s, ali je sad povećana na 42 Mbit/s. HSDPA je osmišljen kako bi povećao brzinu prijenosa podataka u silaznom smjeru te pritom se koristi tehnikama brzog ponovnog slanja podataka na fizičkom sloju, brzom prilagodbom veze u baznoj postaji, itd. Brzi paketski pristup u uzlaznom smjeru pojavio se kao dio 3GPP Relase 6, a izišao je u prosincu 2004. U početnoj fazi HSUPA je omogućavala vršne brzine prijenosa podataka od 1 do 2 Mbit/s, dok trenutno omogućava brzine prijenosa podataka od 11,5 Mbit/s. Obje tehnologije, HSDPA i HSUPA zajedno, nazivaju se brzi paketski pristup (HSPA)

QoS management in UMTS terrestrial radio access FDD networks

This work investigates the role and importance of some of the key aspects of QoS planning, provisioning, monitoring and optimisation (QoS Management) for UMTS Terrestrial Radio Access (UTRA) FDD networks within the framework of the 3rd Generation Partnership Project (3GPP). Firstly, the differences between Quality of end user Experience (QoE) and Quality of Service (QoS) are explained. This is followed by a review of 3GPP requirements for QoS concept and architecture. Then all models and the main assumptions in this dissertation are presented. Based on these, original QoS mechanisms in the radio access network domain, means and methods for QoS provisioning, planning, monitoring and "optimisation" are discussed. Simulation results showed substantial spectral efficiency gains provided by service (or user) differentiation in UTRAN by means of priorities and differentiated parameter settings. When appropriately configured, the proposed QoS mechanisms can greatly reduce the need for bandwidth. Performance results proved also the proposed virtual time simulator to be an appropriate tool for service driven WCDMA radio interface dimensioning and detailed radio network planning. It is also shown that measuring QoS performance by a proper classification of counters (and or gauges), based on a particular subset of radio access bearer attributes, is a promising technique for assessing performances of service applications through WCDMA networks. With this new method there is no need to trace upper layer protocols at different interfaces or dumping data in mobile terminals. The proposed metrics allow operators to measure the bandwidth required for robust statistical reliability, to assess and exploit statistical sharing of resources, to configure QoS functions effectively, and to monitor QoE. The application of the proposed technique is not limited to the WCDMA Radio Network Subsystem (RNS), yet it can be deployed in any radio access and packet core network supporting mapping of performance indicators onto a particular subset of QoS attributes. Finally, in order to maximise the performance of the available services in UTRAN, at a given QoE, simulation results showed clear needs for the network administrator to adapt the parameter settings to diverse input application traffic conditions and the proposed genetic approach to be an appropriate solution space search algorithm for this purpose.reviewe