UMTS aims at providing services such as web browsing, messaging, mobile commerce, videoconferencing, and other services to be developed according to emerging subscribers’ needs with the following objectives:
• high transmission rates encompassing circuit-switched and packet-switched connections;
• high spectral efficiency and overall cost improvement
• definition of common radio interfaces for multiple environments
• Portability of services in various environments (indoor, outdoor, suburban, urban, rural, pedestrian, vehicular, satellite, etc.). This service portability is also known as the Virtual Home Environment concept.
3G Services
The UMTS Forum classifies 3G services into the following six groups as illustrated:
1- Mobile Internet access: a mobile access to the Internet with service quality close to the one offered by fixed Internet Service Providers. This includes full Web access, file transfer, electronic mail, and streaming video and audio.
2- Mobile Intranet/Extranet access: a secure framework for accessing corporate Local Area Networks (LANs) and Virtual Private Networks (VPNs).
3- Customized infotainment: a device-independent access to personalized content from mobile portals.
4- Multimedia messaging service: a means of exchanging messages containing multimedia contents including text, images, and video and audio elements.
5- Location-based services: location-aware services such as vehicle tracking, local advertisements, etc.
6- Rich voice and simple voice: real-time, two-way voice communications. This includes Voice over IP (VoIP), voice-activated network access, and Internet-initiated voice calls.
First Phase UMTS
The UMTS architecture [3GPP-23.101] has to meet the requirements of various UMTS services.
First Phase UMTS Architecture
The first phase UMTS architecture is based on evolved GSM and GPRS core networks and a specifically tailored Universal Terrestrial Radio Access Network (UTRAN).
User Equipment
The UE, usually provided to the subscriber in the form of a handset, is itself composed of a Mobile Equipment (ME) and a UMTS Subscriber Identity Module (USIM).
The 3GPP classifies multi-mode UEs into the following four categories:
• Type 1: type 1 user equipment operates in one single mode at a time (GSM or UTRA). It cannot operate in more than one mode at a time.
• Type 2: while operating in one mode, type 2 user equipment can scan for and monitor another mode of operation.
• Type 3: type 3 user equipment differs from type 2 user equipment by the fact that the type 3 UE can receive more than one mode at a time. However, a type 3 UE cannot emit simultaneously in more than one mode.
• Type 4: type 4 user equipment can receive and transmit simultaneously in more than one mode. Switching from one mode to another is performed automatically.
UTRA Network
The UTRAN is composed of nodes B and Radio Network Controllers (RNCs). The node B is responsible for the transmission of information in one or more cells, to and from UEs. It also participates partly in the system resource management. The node B interconnects with the RNC via the Iub interface. The RNC controls resources in the system and interfaces the core network.
First Phase UMTS Core Network
The first phase UMTS core network is based on an evolved GSM network subsystem (circuit-switched domain) and a GPRS core network (packet-switched domain).
Second Phase UMTS
The objective of this initial architecture is to allow mobile network operators to rapidly roll out UMTS networks on the basis of existing GSM and GPRS networks. From this first phase UMTS architecture, the next phase is to evolve to architecture with a core network based on an enhanced packet-switched domain only. The objective is to allow a better convergence with the Internet by using IP-based protocols whenever possible.
• high transmission rates encompassing circuit-switched and packet-switched connections;
• high spectral efficiency and overall cost improvement
• definition of common radio interfaces for multiple environments
• Portability of services in various environments (indoor, outdoor, suburban, urban, rural, pedestrian, vehicular, satellite, etc.). This service portability is also known as the Virtual Home Environment concept.
3G Services
The UMTS Forum classifies 3G services into the following six groups as illustrated:
1- Mobile Internet access: a mobile access to the Internet with service quality close to the one offered by fixed Internet Service Providers. This includes full Web access, file transfer, electronic mail, and streaming video and audio.
2- Mobile Intranet/Extranet access: a secure framework for accessing corporate Local Area Networks (LANs) and Virtual Private Networks (VPNs).
3- Customized infotainment: a device-independent access to personalized content from mobile portals.
4- Multimedia messaging service: a means of exchanging messages containing multimedia contents including text, images, and video and audio elements.
5- Location-based services: location-aware services such as vehicle tracking, local advertisements, etc.
6- Rich voice and simple voice: real-time, two-way voice communications. This includes Voice over IP (VoIP), voice-activated network access, and Internet-initiated voice calls.
First Phase UMTS
The UMTS architecture [3GPP-23.101] has to meet the requirements of various UMTS services.
First Phase UMTS Architecture
The first phase UMTS architecture is based on evolved GSM and GPRS core networks and a specifically tailored Universal Terrestrial Radio Access Network (UTRAN).
User Equipment
The UE, usually provided to the subscriber in the form of a handset, is itself composed of a Mobile Equipment (ME) and a UMTS Subscriber Identity Module (USIM).
The 3GPP classifies multi-mode UEs into the following four categories:
• Type 1: type 1 user equipment operates in one single mode at a time (GSM or UTRA). It cannot operate in more than one mode at a time.
• Type 2: while operating in one mode, type 2 user equipment can scan for and monitor another mode of operation.
• Type 3: type 3 user equipment differs from type 2 user equipment by the fact that the type 3 UE can receive more than one mode at a time. However, a type 3 UE cannot emit simultaneously in more than one mode.
• Type 4: type 4 user equipment can receive and transmit simultaneously in more than one mode. Switching from one mode to another is performed automatically.
UTRA Network
The UTRAN is composed of nodes B and Radio Network Controllers (RNCs). The node B is responsible for the transmission of information in one or more cells, to and from UEs. It also participates partly in the system resource management. The node B interconnects with the RNC via the Iub interface. The RNC controls resources in the system and interfaces the core network.
First Phase UMTS Core Network
The first phase UMTS core network is based on an evolved GSM network subsystem (circuit-switched domain) and a GPRS core network (packet-switched domain).
Second Phase UMTS
The objective of this initial architecture is to allow mobile network operators to rapidly roll out UMTS networks on the basis of existing GSM and GPRS networks. From this first phase UMTS architecture, the next phase is to evolve to architecture with a core network based on an enhanced packet-switched domain only. The objective is to allow a better convergence with the Internet by using IP-based protocols whenever possible.
No comments:
Post a Comment