04-05-2012, 02:30 PM
CHALLENGES IN DEVELOPING AND DEPLOYING 3G SYSTEM
[attachment=21275]
ABSTRACT
Development of 3rd Generation Cellular Wireless (3G)Technologies is well underway within Network Equipment Manufacturers. Most major wireless Service
Providers are beginning technology trials, but production networks will not be rolled out until 2001 at the earliest.This paper introduces 3G Wireless technology, standards and protocols. The main components of a UMT S W-CDMA System are explained and a five stage testing strategy is defined. This testing strategy is specifically designed to help accelerate the development and deployment of 3G Radio Access Network (RAN)
equipment. 3G systems will provide much greater levels of functionality and flexibility than any predecessors. This of course means that such systems will be significantly more complex in design, and correspondingly more difficult to get right.
Introduction:
In their 3G umbrella standard known as IMT-2000, the International Tele communications Union (ITU) has endorsed five different modes of RF interface, and three major types of terrestrial infrastructure (known as the "Radio Access Network", or "RAN").Multi-mode phones will be technically and economically feasible, hence enabling true global roaming. The three major types of RAN are based on 2nd generation systems.Terminology is still evolving, and varies somewhat between countries,but they are generally referred to as UMTS W-CDMA and IS-2000 (previously cdma2000).
UMTS W-CDMA is based on an evolution of the GSM (MAP) RAN, and is the most common system deployed globally, supported by the largest number of NEMs and SPs. The body known as 3G Partnership Project (3GPP) has been chartered by the ITU to develop the UMTS W-CDMA specifications. UMTS W-CDMA uses Asynchronous Transfer Mode (ATM) to connect the network components in the RAN, and ATM Adaptation.Layer Type 2 (AAL-2) to transport the voice and data.
IS-2000 is based on an evolution of the ANSI-41 RAN used by cdma One systems, and is defined by the 3G Partnership Project 2 (3GPP2).
Figure 1: International Telecommunication Union’s IMT-2000 Concept
UMTS W-CDMA Systems
Figure 2 shows a logical diagram of a UMTS W-CDMA system. In this, we can see the following main components:
User Equipment:
Sometimes called a Mobile Station. A more general name for a handset. This could be one of many conceivable devices, e.g. a mobile cellular telephone, a handheld Personal Digital Assistant (PDA), or a cellular modem connected to a PC.
------------------------------------------------------------------------------------------------------------
Node B:
This is the name given by the 3GPP specifications, to the entity which in real-life is usually called the Base Station Controller or Radio Base Station. This device provides the gateway between the RF interface to the handset, and RAN.
------------------------------------------------------------------------------------------------------------
Radio Network
Controller : The RNC connects to and co-ordinates as many as 150 base stations. It is involved in making decisions and implementing Diversity Hand Over (DHO), which is a process where decisions are made on which base stations will be used to communicate to and from the user equipment.
------------------------------------------------------------------------------------------------------------
Core Network
Interface :
“Core Network" is the name given by 3GPP to the rest of the terrestrial core network infrastructure connected to the RAN through the Iu interface. The gateway device is usually called a Mobile Switching Centre, or Mobile Multimedia Switch, and is the gateway into the various terrestrial core networks such as ATM, IP-Over-SDH, and the PSTN.
[attachment=21275]
ABSTRACT
Development of 3rd Generation Cellular Wireless (3G)Technologies is well underway within Network Equipment Manufacturers. Most major wireless Service
Providers are beginning technology trials, but production networks will not be rolled out until 2001 at the earliest.This paper introduces 3G Wireless technology, standards and protocols. The main components of a UMT S W-CDMA System are explained and a five stage testing strategy is defined. This testing strategy is specifically designed to help accelerate the development and deployment of 3G Radio Access Network (RAN)
equipment. 3G systems will provide much greater levels of functionality and flexibility than any predecessors. This of course means that such systems will be significantly more complex in design, and correspondingly more difficult to get right.
Introduction:
In their 3G umbrella standard known as IMT-2000, the International Tele communications Union (ITU) has endorsed five different modes of RF interface, and three major types of terrestrial infrastructure (known as the "Radio Access Network", or "RAN").Multi-mode phones will be technically and economically feasible, hence enabling true global roaming. The three major types of RAN are based on 2nd generation systems.Terminology is still evolving, and varies somewhat between countries,but they are generally referred to as UMTS W-CDMA and IS-2000 (previously cdma2000).
UMTS W-CDMA is based on an evolution of the GSM (MAP) RAN, and is the most common system deployed globally, supported by the largest number of NEMs and SPs. The body known as 3G Partnership Project (3GPP) has been chartered by the ITU to develop the UMTS W-CDMA specifications. UMTS W-CDMA uses Asynchronous Transfer Mode (ATM) to connect the network components in the RAN, and ATM Adaptation.Layer Type 2 (AAL-2) to transport the voice and data.
IS-2000 is based on an evolution of the ANSI-41 RAN used by cdma One systems, and is defined by the 3G Partnership Project 2 (3GPP2).
Figure 1: International Telecommunication Union’s IMT-2000 Concept
UMTS W-CDMA Systems
Figure 2 shows a logical diagram of a UMTS W-CDMA system. In this, we can see the following main components:
User Equipment:
Sometimes called a Mobile Station. A more general name for a handset. This could be one of many conceivable devices, e.g. a mobile cellular telephone, a handheld Personal Digital Assistant (PDA), or a cellular modem connected to a PC.
------------------------------------------------------------------------------------------------------------
Node B:
This is the name given by the 3GPP specifications, to the entity which in real-life is usually called the Base Station Controller or Radio Base Station. This device provides the gateway between the RF interface to the handset, and RAN.
------------------------------------------------------------------------------------------------------------
Radio Network
Controller : The RNC connects to and co-ordinates as many as 150 base stations. It is involved in making decisions and implementing Diversity Hand Over (DHO), which is a process where decisions are made on which base stations will be used to communicate to and from the user equipment.
------------------------------------------------------------------------------------------------------------
Core Network
Interface :
“Core Network" is the name given by 3GPP to the rest of the terrestrial core network infrastructure connected to the RAN through the Iu interface. The gateway device is usually called a Mobile Switching Centre, or Mobile Multimedia Switch, and is the gateway into the various terrestrial core networks such as ATM, IP-Over-SDH, and the PSTN.