Gsm network topology description using rf optimization tool optpcs. Gsm network architecture, channelisation, signalling and call. Radio access network topology planning for the 4g networks. Also in ring topology all the traffic flows in only one direction at very high speed. Pdf a model for gsm mobile network design researchgate. The connectivity is being used by over 2 billion people worldwide.
There were four main elements to the overall gsm network architecture and these could often be further split. However, there is a whole lot of a difference between the topologies of a logical network and the topology of physical network. A pstn network topology is the switching network topology of a telephone network connected to the public switched telephone network pstn in the united states and canada, the bell system network topology was the switching system hierarchy implemented and operated from the late 1940s to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone. Bus topology in this topology, there is a node send message to another node on the network sends a broadcast message onto the network that all other nodes see, but only the intended recipient actually accepts and processes the message. There are physical and logical channels in gsm radio system. There are numerous ways a network can be arranged, all with different pros and cons, and some are more useful in certain circumstances than others. Scalability a peertopeer network is great for a home network with a handful of users such as three to five pcs. Due to the mobility of the subscribers, the organisational structure must be subdivided into different processing elements. An example of the 4gran ring topology is shown in figure 1. World wireless academy overviews how wireless network topology evolves from 3g to 4g. Elements like the base station controller, msc, auc, hlr, vlr and the like. The gsm network can be split into three subnetworks. Network topologies topology physical and logical network layout physical actual layout of the computer cables and other network devices logical the way in which the network appears to the devices that use it. Topological planning and design of umts mobile networks.
The additional components of the gsm architecture comprise of databases and messaging systems functions. This representation can include the location of equipment cables, posts, connectivity devices. Pdf costbased umts transport network topology optimization. The gateway msc or gmsc the purpose of which is to query the hlr and determine the location of the subscriber. Section 1 gsm architecture overview the imsi identifies the subscriber within the gsm network while the ms isdn is the actual telephone number a caller possibly in another network uses to reach that person. The star topology reduces the chance of network failure by connecting all of the systems to a central node. Network topology refers to the layout of a network and how different nodes in a network are connected to each other and how they communicate. The network topology of the nss is more flexible than the hierarchi. The terms circuit and channel are frequently used as synonyms for the.
It differentiates data destined for the standard gsm network circuit switched data and data destined for the edge network packet switched data. Nov 02, 2017 star topology in which each of the nodes of the network is connected to a central node with a pointtopoint link in a hub and spoke fashion, the central node being the hub and the nodes that are attached to the central node being the spokes e. In a peertopeer network situation in which a hub or switch is not used such as a phoneline network, it becomes a real possibility that the network can get bogged down when more than one user is using it at the same time. It falls in 2g second generation mobile connectivity network. The gsm network architecture provided a simple and yet effective architecture to provide the services needed for a 2g cellular or mobile communications system. In the us, gsm operates in the bands 850 mhz and 1900 mhz. Gsm uses narrowband time division multiple access tdma for providing voice and text based services over mobile phone networks. A network that uses a bus topology is referred to as a bus network which was the original form of ethernet networks. Gsm network interfaces um,a,asub,abis,b,c,d,e,f,g interface.
Primarily it is the protocol which allows end users of a gsm or wcdma network to move from place to place while continuing to connect to the internet as if from one location at the gateway gprs support node ggsn. However, there is a whole lot of a difference between the topologies of a logical. Exploiting a gsm network for precise payload delivery. This chapter introduces the principles of the umts topology planning, which means combined coverage and capacity planning. A star topology, the most common network topology, is laid out so every node in the network is directly connected to one central hub via coaxial, twistedpair, or fiberoptic cable. The circuit switched network with mscs is called nss network subsystem. Umts is a 3g mobile communications technology that provides wideband code division multiple access cdma radio technology. Gsm umtslte call flow and mo call and mt call animated video duration. Ethernet 10base2 also known as thinnet is used for bus topology. Expansion can be as simple as linking in an additional star network topology onto the bus. At the beginning of the 1990s, the gsm mobile phone network was established in. Specification of the strategic network planning tool gsm. This gsm tutorial covers gsm basics, gsm architecture and gsm system features.
The topology planning phase contains definitions of site locations and configurations together with the base station antenna configuration. Radio access network core network gsmgprsbased utran ue iu cs uu iur pstn bs rnc msc vlr gmsc hlr iub 3gpp rel. The msc is responsible for toll ticketing, network interfacing, common channel signaling. It is a great opportunity for me to manipulate and do to many actions inside the gsm network that equip with hundred electronic systems like. It is named the clustercellular or, in other words, it is known as a ring topology. Information theory and signal processing in gsm network. Gprs tunnelling protocol is the defining ipbased protocol of the gprs core network. Cellular networks khoury college of computer sciences. Evolutionary analysis of gsm, umts and lte mobile network.
The global system for mobile communications gsm is a standard developed by the european telecommunications standards institute etsi to describe the protocols for secondgeneration 2g digital cellular networks used by mobile devices such as mobile phones and tablets. Mobile services switching center msc the network element which performs the telephony switching functions of the gsm network. An important function of oss is to provide a network overview and support the. Its promoter, the gsm association, estimates that 80% of the global mobile market uses this standard. A survey of computer network topology and analysis examples. Generally, a topology refers to a shape of the body and by going according to that theory, a network topology refers to the shape a network exists in. It has an open, distributed architecture the separation of switching and service control functions full use of ss7 as the signaling infrastructure its clearly defined and specified interfaces the nature of its in structure. If the topology of the network allows it, the interrogation could be. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. May, 2019 network topology refers to the layout of a network and how different nodes in a network are connected to each other and how they communicate. A gsm network must accept any gsm compliant phone, leaving consumers quite a bit of. Star topology in which each of the nodes of the network is connected to a central node with a pointtopoint link in a hub and spoke fashion, the central node being the hub and the nodes that are attached to the central node being the spokes e. Telecommunications network and service architectures.
As for pstn, it consists of a switching plane where mobile switching centers mscs may be found. Figure 271 shows a basic gprsumts network topology. Nov 12, 2019 gsm pronounced geeessem is the most popular cell phone standard, and is used internationally, so youve probably heard about it in the context of gsm phones and gsm networks, especially when compared to cdma. As shown in figure 3, these areas include cells, location areas las, mscvlr service areas, and public land mobile network plmn areas. Umts network topology free download as powerpoint presentation. The global system for mobile communications gsm which is a standard for 2g second generation cellular networks has created an avenue for. User guide for the cisco mobile wireless transport manager 6. Gsm often described as a true intelligence network, gsm is called the first true wireless network because. Network areas the cell is the area given radio coverage by one base transceiver station. Download free network topologies tutorial course material and training in pdf file under 4 pages by maninder kaur. Mobile station ms, base station controller bsc, and base transceiver station bts, mobile.
Cn rnc iu cn core network rnc radio network controller. Since its beginning in the 80s, gsm telephone system was developed using cell concept for the network topology. The eps architecture is made up of an epc packet core network, also referred as epc and an eutran radio access network also referred as lte. Given below is a simple pictorial view of the gsm architecture. This basic tutorial on gsm architecture also covers gsm burst types, gsm frame structure, gsm channels, gsm physical layer and so on. Apr 25, 20 lte network topology and architecture there is a new approach in the interconnection between radio access network and core network.
Gsm is the short form of global system for mobile communications. The hub, switch, or concentrator manages and controls all functions of the network. The pcu itself may be a separate physical entity, or more often these days it is incorporated into the base station controller, bsc, thereby saving additional hardware costs. Messages in a tree network topology can be either broadcast from the central node to all interconnected star networks, or targeted to select star networks.
Marc sthilaire, department of systems and computer engineering. Umts network topology computer network telecommunications. It looks similar to pstn but supports an additional service called terminal mobility. The pcu itself may be a separate physical entity, or more often these days it is incorporated into the base station. One major advantage of the tree network topology is the ease at which the network can be expanded. Aug 15, 2019 a star topology, the most common network topology, is laid out so every node in the network is directly connected to one central hub via coaxial, twistedpair, or fiberoptic cable. Network topologies michigan technological university. Architecture of the gsm system several providers setup mobile networks following the gsm standard within each country components oms mobile station obs base station omsc mobile switching center olr location register subsystems orss radio subsystem. Ring networks are moderately easy to install expansion to the. Scribd is the worlds largest social reading and publishing site. Gsm is a circuitswitched system that divides each 200 khz channel into eight 25 khz timeslots. Gsm network areas the gsm network is made up of geographic areas.
Gsmumtslte call flow and mo call and mt call animated video duration. Its not meant for a beginner to gsm and only quickly covers some of the network aspects in a general sense. Pdf this work shows a mathematical and computational tool to design a gsm global system for mobile communications network, in the point of view of. Network topology is the way a network is arranged, including the physical or logical description of how links and nodes are set up to relate to each other. Gsm architecture a gsm network comprises of many functional units. Gsm operates on the mobile communication bands 900 mhz and 1800 mhz in most parts of the world. Each node gets to send the data when it receives an empty token. From a consumer standpoint, gsm is more convenient because a gsm phone carries all the customers data on a removable sim card. The purpose of oss is to offer the customer costeffective support for centralized, regional, and local operational and maintenance activities that are required for a gsm network.
Visitor location register vlr a database which stores temporary information about roaming gsm subscribers. A computer network is comprised of nodes and links, a node is the end point of any branch in a computer, a terminal device, workstation or interconnecting equipment facility. Due to the mobility of the subscribers, the organisational structure must be. Topologies are either physical the physical layout of devices on a network or logical the way that the signals act on the network media, or the way that the data passes through the network from one. Geographical structures in a mobile communication network gsm is a worldwide standard for mobile communication with an extensive coverage. If a star topology is established with mobile phone subscribers. A gsm network must accept any gsmcompliant phone, leaving consumers quite a bit of. Data on a star network passes through the hub, switch, or concentrator before continuing to its destination. This page of gsm tutorial covers gsm network interfaces which includes um, a, asub, abis, b, c, d, e, f and g interfaces. Feb 07, 2011 gsm network topology description using rf optimization tool optpcs. Gsm global system for mobile communication is the standard by which vast number of handsets work.