Global System for Mobile (GSM) Communication Overview

Global System for Mobile (GSM) Communication Overview Tara Rushdi Haydar Sinar Selahaddin Merdan Rojgar Mewlud Murad Contents (Jump to) Introduction What is GSM? GSM Network Architecture What is Roaming? What is GRAN? Requirement need for building GSM Generation of GSM Conclusion References Introduction GSM is a connection between two people − a caller and the called person – is the basic service of all telephone networks. To apply this service, the network must has ability to set up and maintain a call, which includes some tasks: identifying the called person, determining the location, routing the call, and ensuring that the connection is continued until conversation lasts. After the transaction, the connection is terminated. In a fixed telephone network, providing and managing connections is an easy process, because telephones are connected by wires to the network and their location is permanent from the networks’ point of view. Whereas, in a mobile network, the establishment of a call is more complex task, because it doesn’t have wire and permanent location. It enables the users to move by wireless (radio) connection. What is GSM? GSM stands for Global System for Mobile Communication and is an open, digital cellular technology transmits mobile voice and data services. It is a  digital  mobile telephony system that is widely used technology in the world. The GSM market has more than 70 percent of the worlds digital cellular subscribers. The GSM makes use of narrowband  Time Division Multiple Access (TDMA)  technique for transmitting signals. The GSM was developed by using digital technology. It has an ability to carry 64 kbps to 120 Mbps of data rates. GSM operates at either the 900  MHz  or 1800 MHz frequency band. In Europe, operates in the 900MHz and 1.8GHz bands and in US, operates 1.9GHz and 850MHz bands. The GSM is a circuit-switched system that divides each 200 kHz channel into eight 25 kHz time-slots. Cell phones use GSM network by searching for cell phone towers in the nearby area. GSM carriers have roaming contacts with other GSM carriers and typically cover rural areas more completely. GSM also has the advantage of using SIM (SubscriberIdentityModule) cards. The SIM card, which acts as your digital identity, is tied to your cell phone service carrier’s network rather than to the handset itself. This allows for easy exchange from one phone to another without new cell phone service activation. Today, more than 690 mobile networks provide GSM services across 213 countries and GSM represents 82.4% of all global mobile connections. According to GSM World, there are now more than 2 billion GSM  mobile phone users worldwide. GSM World references China as the largest single GSM market, with more than 370 million users, followed by Russia with 145 million, India with 83 million and the USA with 78 million users. GSM network architecture The GSM network is divided into three major systems: The operation and support system (OSS) The switching system (SS) The base station system (BSS)     Ã‚   GSM network architecture The Operation and Support System (OSS) The OSS stands for operation and support system. The function of OSS is that monitors and controls the system. The aim of OSS is that customer cost-effective support for centralized, regional, and local operational and maintenance activities that are needed for a GSM network. An important task of OSS is to ensure a network overview and support the maintenance activities of different operation and maintenance organizations. The Switching System The switching system (SS) is responsible for performing call processing and  Subscriber-related functions. The switching system (SS) includes some functional units: Home location register (HLR)—The HLR is a database used for storage and management of subscriptions. The HLR stores permanent data about subscribers, including a subscribers service profile, location information, and activity status. When a person buys a subscription, he/she is registered in the HLR of that operator. Mobile services switching center (MSC)—The MSC performs the telephony switching functions of the system. It controls calls to and from other telephone and data systems. Also, it performs toll ticketing, network interfacing, common channel signaling, and others functions. Visitor location register (VLR)—The VLR is a database that contains temporary information about subscribers that is needed by the MSC in order to service visiting subscribers. The VLR is always integrated with the MSC. When a mobile station roams into a new MSC area, the VLR connected to that MSC will request data about the mobile station from the HLR. Later, if the mobile station makes a call, the VLR will have the information needed for call setup without having to interrogate the HLR each time. Authentication center (AUC)—A unit called the AUC provides authentication and encryption parameters that verify the users identity and ensure the confidentiality of each call. The AUC protects network operators from different types of fraud found in todays cellular world. Equipment identity register (EIR)—The EIR is a database that includes information about the identity of mobile equipment that intercepts calls from stolen, unauthorized, or defective mobile stations. The Base Station System (BSS) All radio-related functions are performed in the BSS, which consists of base station controllers (BSCs) and the base transceiver stations (BTSs). BSC—The BSC provides all the control functions and physical links between the MSC and BTS. It is a high-capacity switch that provides functions such as handover, cell configuration data, and control of radio frequency (RF) power levels in base transceiver stations. BTS—The BTS handles the radio interface to the mobile station. The BTS is the radio equipment (transceivers and antennas) needed to Service each cell in the network. BSC controls a group of BTSs. MS MS stands for Mobile Station. It is a combination of terminal equipment and subscriber data. The terminal equipment is called ME (Mobile Equipment) and the subscribers data is stored in a separate module called SIM (Subscriber Identity Module). Therefore, ME + SIM = MS. The SIM card contains an identification number of the user and list of available networks. What is Roaming? Roaming allows a mobile subscriber to automatically make and receive voice calls, send and receive data, or access other services when travelling outside the geographical coverage area of their home network, by means of using a visited network. Roaming is technically supported by mobility management, authentication and billing procedures. Establishing roaming between network operators is based on – and the commercial terms are contained in – dedicated roaming agreements. If the visited network is in the same country as the home network, this is known as national roaming. If the visited network is outside the home country, this is known as international roaming. If the visited network operates on a different technical standard than the home network, this is known as inter-standard roaming. GSM Roaming, which involves roaming between GSM networks, offers the mobile subscriber the convenience of being able to use a single number, a single bill and a single phone. The convenience of GSM Roaming has been a key driver behind the global success of the GSM Platform. The GSMA’s  GSM Coverage Maps  are a unique resource containing information supplied and approved by the members of the Association. The network, services and roaming information are continually updated to reflect the evolving situation worldwide. Interactive coverage maps, updated quarterly, allow you to navigate to see where exactly you can use your phone. What is GRAN? GRANis an abbreviation of  GSMRadio Access Network. It consists of  Base Transceiver Stations  (BTS) and  Base Station Controllers  (BSC). Its purpose is to manage the radio link between  mobile phones  and a  telecommunicationcore network. This access network provides access to both  Circuit switched  (CS) and  Packet switched  (PS) core networks. Aradio access network(RAN) is part of a mobile  telecommunication  system. It implements a  radio access technology. Conceptually, it resides between devices like a mobile phone, a computer, or any remotely controlled machine and provides connection with its  core network  (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. Network Management Subsystem (NMS) The Network Management Subsystem (NMS) is the third subsystem of the GSM network in addition to the Network Switching Subsystem (NSS) and Base Station Subsystem (BSS). The purpose of the NMS is to monitor various functions and elements of the network. The operator workstations are connected to the database and communication servers via a Local Area Network (LAN). The database server stores the management information about the network. The communications server takes care of the data communications between the NMS and the equipment in the GSM network known as â€Å"network elements†. These communications are carried over a Data Communications Network (DCN), which connects to the NMS via a router. The functions of the NMS can be divided into three categories: Fault management Configuration management Performance management These functions cover the whole of the GSM network elements from the level of individual BTSs, up to MSCs and HLRs. Fault management The aim of fault management to detect different type of problems then solve them rapidly. Fault management provides the network operator with information about the current status of alarm events and maintains a history database of alarms. The alarms are stored in the NMS database and this database can be searched according to criteria specified by the network operator. Configuration management The purpose of configuration management is to maintain up-to-date information about the operation and configuration status of network elements. Specific configuration functions include the management of the radio network, software and hardware management of the network elements, time synchronization, and security operations. Performance management In performance management, the NMS collects measurement data from individual network elements and stores it in a database. On the basis of these data, the network operator is able to compare the actual performance of the network with the planned performance and detect both good and bad performance areas within the network. Requirement need for building GSM Hardware and software A typical GSM base station, can’t do anything without a suite of components that maintain databases, perform call- ­switching functions, and so forth. This infrastructure is expensive (typically around $250,000) and complicated to configure, and it needs to be stored in an air-conditioned room. Obviously, that’s impractical in the kinds of places  ­OpenBTS is designed for. As a result, the system replaces much of the physical infrastructure of the core network with VoIP software–in this case, an open-source program called Asterisk that can be installed on any off-the-shelf PC. IP Connection Cell-phone users on an OpenBTS network can reach each other even if the system isn’t connected to the Internet, but reaching someone outside the network requires an Internet connection. On Niue, the group used five-gigahertz IP radios to link the BTS unit to Telecom Niue’s wired Internet infrastructure, four kilometers away. Burgess says that response time can get a bit sluggish if the Internet connection isn’t very good, but it doesn’t take much bandwidth to make the system functional. Power supply The system deployed on Niue draws about 60 watts of power, supplied by three marine batteries of the type that many locals use on their boats. Because the system’s power requirements are so low, Burgess says, a base station could also run on solar or wind power. GSM  handset OpenBTS re-creates the technology behind GSM (the global system for mobile communications), which is used by the majority of mobile phones in the world. Any GSM phone will â€Å"see† an OpenBTS network as a standard cell network and interact with it normally. Antenna Like any cell network, an OpenBTS system requires an antenna to facilitate signaling. Different types of antennas can be used, according to the range the operator wants the network to have. Generation of GSM First generation technology(1G) First-generation mobile systemsused analog transmission for speech services. It offered handover and roaming capabilities, but it was unable to interoperate between countries. So, this is disadvantage of first-generation. Second generation technology(2G) Second generation mobile system used digital transmission. It able to use handover and roaming capabilities. It uses FDMA, TDMA, and CDMA. Third generation technology(3G) Third generation technology has fast data transfer rate. It enables to add services like mobile television, GPS, and video conferencing. Services include a wide area wireless voice telephony, video call, and broadband wireless data, all in mobile environment. Fourth generation technology(4G) Fourth generation technologyhas more bandwidth and services than 3G. The expectation for the 4G technology is the high quality audio/video streaming overend to end Internet Protocol, and work at 100 Mbps for mobile users and upto 1 Gbps over fixed stations. The word â€Å"MAGIC† also refers to 4G wireless technology which stands for Mobile multimedia, Any-where, Global mobility solutions over, integrated wireless and Customized services. Fifth generation technology (5G) Fifth generation technology has changed the means to use cell phones within very high bandwidth, high connectivity, and has extraordinary data capabilities. User never experienced ever before such a high value technology. The 5G technologies include alltype of advanced features which makes5G technology most powerful and in huge demand in near future. 5G technology including camera, MP3 recording, video player, largephone memory ,dialing speed, audio player and much more you never imagine. 5G technology going to be a new mobile revolution in mobile market, so may be incoming days 5G technology takes over the world market. Conclusion Year by year, the GSM system improves and its subscribers increases around the world. It divides into three main parts that are OSS, SS, and BSS. These parts include some important department that manages the system, stores information of users, and another tasks. GSM has ability to roam worldwide and has roaming agreements in place with foreign operators globally. So, users can easily use their same SIM in another cities or countries. GSM network facilitate easier access to cellular and satellite platforms across international lines. Using digital technology, it employs both speech and data channels in its system. In addition, GSM has network management subsystem that detects problems and solves them, maintains information up to date, and detects good and bad performance of a network. References http://searchmobilecomputing.techtarget.com/definition/GSM http://en.wikipedia.org/wiki/GSM_radio_access_network http://en.wikipedia.org/wiki/Radio_access_network http://www.gsma.com/aboutus/gsm-technology/roaming https://www.eff.org/files/filenode/global_system_for_mobile_communication_technology.pdf http://www.tutorialspoint.com/gsm/gsm_overview.htm http://cellphones.about.com/od/phoneglossary/g/gsm.htm http://www.academia.edu/3099956/Generations_of_Wireless_Communication._From_0G_to_5G_Abhi http://www.technologyreview.com/hack/418552/build-your-own-cellular-network/

Global System for Mobile (GSM) Communication Overview

Global System for Mobile (GSM) Communication Overview Tara Rushdi Haydar Sinar Selahaddin Merdan Rojgar Mewlud Murad Contents (Jump to) Introduction What is GSM? GSM Network Architecture What is Roaming? What is GRAN? Requirement need for building GSM Generation of GSM Conclusion References Introduction GSM is a connection between two people − a caller and the called person – is the basic service of all telephone networks. To apply this service, the network must has ability to set up and maintain a call, which includes some tasks: identifying the called person, determining the location, routing the call, and ensuring that the connection is continued until conversation lasts. After the transaction, the connection is terminated. In a fixed telephone network, providing and managing connections is an easy process, because telephones are connected by wires to the network and their location is permanent from the networks’ point of view. Whereas, in a mobile network, the establishment of a call is more complex task, because it doesn’t have wire and permanent location. It enables the users to move by wireless (radio) connection. What is GSM? GSM stands for Global System for Mobile Communication and is an open, digital cellular technology transmits mobile voice and data services. It is a  digital  mobile telephony system that is widely used technology in the world. The GSM market has more than 70 percent of the worlds digital cellular subscribers. The GSM makes use of narrowband  Time Division Multiple Access (TDMA)  technique for transmitting signals. The GSM was developed by using digital technology. It has an ability to carry 64 kbps to 120 Mbps of data rates. GSM operates at either the 900  MHz  or 1800 MHz frequency band. In Europe, operates in the 900MHz and 1.8GHz bands and in US, operates 1.9GHz and 850MHz bands. The GSM is a circuit-switched system that divides each 200 kHz channel into eight 25 kHz time-slots. Cell phones use GSM network by searching for cell phone towers in the nearby area. GSM carriers have roaming contacts with other GSM carriers and typically cover rural areas more completely. GSM also has the advantage of using SIM (SubscriberIdentityModule) cards. The SIM card, which acts as your digital identity, is tied to your cell phone service carrier’s network rather than to the handset itself. This allows for easy exchange from one phone to another without new cell phone service activation. Today, more than 690 mobile networks provide GSM services across 213 countries and GSM represents 82.4% of all global mobile connections. According to GSM World, there are now more than 2 billion GSM  mobile phone users worldwide. GSM World references China as the largest single GSM market, with more than 370 million users, followed by Russia with 145 million, India with 83 million and the USA with 78 million users. GSM network architecture The GSM network is divided into three major systems: The operation and support system (OSS) The switching system (SS) The base station system (BSS)     Ã‚   GSM network architecture The Operation and Support System (OSS) The OSS stands for operation and support system. The function of OSS is that monitors and controls the system. The aim of OSS is that customer cost-effective support for centralized, regional, and local operational and maintenance activities that are needed for a GSM network. An important task of OSS is to ensure a network overview and support the maintenance activities of different operation and maintenance organizations. The Switching System The switching system (SS) is responsible for performing call processing and  Subscriber-related functions. The switching system (SS) includes some functional units: Home location register (HLR)—The HLR is a database used for storage and management of subscriptions. The HLR stores permanent data about subscribers, including a subscribers service profile, location information, and activity status. When a person buys a subscription, he/she is registered in the HLR of that operator. Mobile services switching center (MSC)—The MSC performs the telephony switching functions of the system. It controls calls to and from other telephone and data systems. Also, it performs toll ticketing, network interfacing, common channel signaling, and others functions. Visitor location register (VLR)—The VLR is a database that contains temporary information about subscribers that is needed by the MSC in order to service visiting subscribers. The VLR is always integrated with the MSC. When a mobile station roams into a new MSC area, the VLR connected to that MSC will request data about the mobile station from the HLR. Later, if the mobile station makes a call, the VLR will have the information needed for call setup without having to interrogate the HLR each time. Authentication center (AUC)—A unit called the AUC provides authentication and encryption parameters that verify the users identity and ensure the confidentiality of each call. The AUC protects network operators from different types of fraud found in todays cellular world. Equipment identity register (EIR)—The EIR is a database that includes information about the identity of mobile equipment that intercepts calls from stolen, unauthorized, or defective mobile stations. The Base Station System (BSS) All radio-related functions are performed in the BSS, which consists of base station controllers (BSCs) and the base transceiver stations (BTSs). BSC—The BSC provides all the control functions and physical links between the MSC and BTS. It is a high-capacity switch that provides functions such as handover, cell configuration data, and control of radio frequency (RF) power levels in base transceiver stations. BTS—The BTS handles the radio interface to the mobile station. The BTS is the radio equipment (transceivers and antennas) needed to Service each cell in the network. BSC controls a group of BTSs. MS MS stands for Mobile Station. It is a combination of terminal equipment and subscriber data. The terminal equipment is called ME (Mobile Equipment) and the subscribers data is stored in a separate module called SIM (Subscriber Identity Module). Therefore, ME + SIM = MS. The SIM card contains an identification number of the user and list of available networks. What is Roaming? Roaming allows a mobile subscriber to automatically make and receive voice calls, send and receive data, or access other services when travelling outside the geographical coverage area of their home network, by means of using a visited network. Roaming is technically supported by mobility management, authentication and billing procedures. Establishing roaming between network operators is based on – and the commercial terms are contained in – dedicated roaming agreements. If the visited network is in the same country as the home network, this is known as national roaming. If the visited network is outside the home country, this is known as international roaming. If the visited network operates on a different technical standard than the home network, this is known as inter-standard roaming. GSM Roaming, which involves roaming between GSM networks, offers the mobile subscriber the convenience of being able to use a single number, a single bill and a single phone. The convenience of GSM Roaming has been a key driver behind the global success of the GSM Platform. The GSMA’s  GSM Coverage Maps  are a unique resource containing information supplied and approved by the members of the Association. The network, services and roaming information are continually updated to reflect the evolving situation worldwide. Interactive coverage maps, updated quarterly, allow you to navigate to see where exactly you can use your phone. What is GRAN? GRANis an abbreviation of  GSMRadio Access Network. It consists of  Base Transceiver Stations  (BTS) and  Base Station Controllers  (BSC). Its purpose is to manage the radio link between  mobile phones  and a  telecommunicationcore network. This access network provides access to both  Circuit switched  (CS) and  Packet switched  (PS) core networks. Aradio access network(RAN) is part of a mobile  telecommunication  system. It implements a  radio access technology. Conceptually, it resides between devices like a mobile phone, a computer, or any remotely controlled machine and provides connection with its  core network  (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. Network Management Subsystem (NMS) The Network Management Subsystem (NMS) is the third subsystem of the GSM network in addition to the Network Switching Subsystem (NSS) and Base Station Subsystem (BSS). The purpose of the NMS is to monitor various functions and elements of the network. The operator workstations are connected to the database and communication servers via a Local Area Network (LAN). The database server stores the management information about the network. The communications server takes care of the data communications between the NMS and the equipment in the GSM network known as â€Å"network elements†. These communications are carried over a Data Communications Network (DCN), which connects to the NMS via a router. The functions of the NMS can be divided into three categories: Fault management Configuration management Performance management These functions cover the whole of the GSM network elements from the level of individual BTSs, up to MSCs and HLRs. Fault management The aim of fault management to detect different type of problems then solve them rapidly. Fault management provides the network operator with information about the current status of alarm events and maintains a history database of alarms. The alarms are stored in the NMS database and this database can be searched according to criteria specified by the network operator. Configuration management The purpose of configuration management is to maintain up-to-date information about the operation and configuration status of network elements. Specific configuration functions include the management of the radio network, software and hardware management of the network elements, time synchronization, and security operations. Performance management In performance management, the NMS collects measurement data from individual network elements and stores it in a database. On the basis of these data, the network operator is able to compare the actual performance of the network with the planned performance and detect both good and bad performance areas within the network. Requirement need for building GSM Hardware and software A typical GSM base station, can’t do anything without a suite of components that maintain databases, perform call- ­switching functions, and so forth. This infrastructure is expensive (typically around $250,000) and complicated to configure, and it needs to be stored in an air-conditioned room. Obviously, that’s impractical in the kinds of places  ­OpenBTS is designed for. As a result, the system replaces much of the physical infrastructure of the core network with VoIP software–in this case, an open-source program called Asterisk that can be installed on any off-the-shelf PC. IP Connection Cell-phone users on an OpenBTS network can reach each other even if the system isn’t connected to the Internet, but reaching someone outside the network requires an Internet connection. On Niue, the group used five-gigahertz IP radios to link the BTS unit to Telecom Niue’s wired Internet infrastructure, four kilometers away. Burgess says that response time can get a bit sluggish if the Internet connection isn’t very good, but it doesn’t take much bandwidth to make the system functional. Power supply The system deployed on Niue draws about 60 watts of power, supplied by three marine batteries of the type that many locals use on their boats. Because the system’s power requirements are so low, Burgess says, a base station could also run on solar or wind power. GSM  handset OpenBTS re-creates the technology behind GSM (the global system for mobile communications), which is used by the majority of mobile phones in the world. Any GSM phone will â€Å"see† an OpenBTS network as a standard cell network and interact with it normally. Antenna Like any cell network, an OpenBTS system requires an antenna to facilitate signaling. Different types of antennas can be used, according to the range the operator wants the network to have. Generation of GSM First generation technology(1G) First-generation mobile systemsused analog transmission for speech services. It offered handover and roaming capabilities, but it was unable to interoperate between countries. So, this is disadvantage of first-generation. Second generation technology(2G) Second generation mobile system used digital transmission. It able to use handover and roaming capabilities. It uses FDMA, TDMA, and CDMA. Third generation technology(3G) Third generation technology has fast data transfer rate. It enables to add services like mobile television, GPS, and video conferencing. Services include a wide area wireless voice telephony, video call, and broadband wireless data, all in mobile environment. Fourth generation technology(4G) Fourth generation technologyhas more bandwidth and services than 3G. The expectation for the 4G technology is the high quality audio/video streaming overend to end Internet Protocol, and work at 100 Mbps for mobile users and upto 1 Gbps over fixed stations. The word â€Å"MAGIC† also refers to 4G wireless technology which stands for Mobile multimedia, Any-where, Global mobility solutions over, integrated wireless and Customized services. Fifth generation technology (5G) Fifth generation technology has changed the means to use cell phones within very high bandwidth, high connectivity, and has extraordinary data capabilities. User never experienced ever before such a high value technology. The 5G technologies include alltype of advanced features which makes5G technology most powerful and in huge demand in near future. 5G technology including camera, MP3 recording, video player, largephone memory ,dialing speed, audio player and much more you never imagine. 5G technology going to be a new mobile revolution in mobile market, so may be incoming days 5G technology takes over the world market. Conclusion Year by year, the GSM system improves and its subscribers increases around the world. It divides into three main parts that are OSS, SS, and BSS. These parts include some important department that manages the system, stores information of users, and another tasks. GSM has ability to roam worldwide and has roaming agreements in place with foreign operators globally. So, users can easily use their same SIM in another cities or countries. GSM network facilitate easier access to cellular and satellite platforms across international lines. Using digital technology, it employs both speech and data channels in its system. In addition, GSM has network management subsystem that detects problems and solves them, maintains information up to date, and detects good and bad performance of a network. References http://searchmobilecomputing.techtarget.com/definition/GSM http://en.wikipedia.org/wiki/GSM_radio_access_network http://en.wikipedia.org/wiki/Radio_access_network http://www.gsma.com/aboutus/gsm-technology/roaming https://www.eff.org/files/filenode/global_system_for_mobile_communication_technology.pdf http://www.tutorialspoint.com/gsm/gsm_overview.htm http://cellphones.about.com/od/phoneglossary/g/gsm.htm http://www.academia.edu/3099956/Generations_of_Wireless_Communication._From_0G_to_5G_Abhi http://www.technologyreview.com/hack/418552/build-your-own-cellular-network/

Global System for Mobile (GSM) Communication Overview

Global System for Mobile (GSM) Communication Overview Tara Rushdi Haydar Sinar Selahaddin Merdan Rojgar Mewlud Murad Contents (Jump to) Introduction What is GSM? GSM Network Architecture What is Roaming? What is GRAN? Requirement need for building GSM Generation of GSM Conclusion References Introduction GSM is a connection between two people − a caller and the called person – is the basic service of all telephone networks. To apply this service, the network must has ability to set up and maintain a call, which includes some tasks: identifying the called person, determining the location, routing the call, and ensuring that the connection is continued until conversation lasts. After the transaction, the connection is terminated. In a fixed telephone network, providing and managing connections is an easy process, because telephones are connected by wires to the network and their location is permanent from the networks’ point of view. Whereas, in a mobile network, the establishment of a call is more complex task, because it doesn’t have wire and permanent location. It enables the users to move by wireless (radio) connection. What is GSM? GSM stands for Global System for Mobile Communication and is an open, digital cellular technology transmits mobile voice and data services. It is a  digital  mobile telephony system that is widely used technology in the world. The GSM market has more than 70 percent of the worlds digital cellular subscribers. The GSM makes use of narrowband  Time Division Multiple Access (TDMA)  technique for transmitting signals. The GSM was developed by using digital technology. It has an ability to carry 64 kbps to 120 Mbps of data rates. GSM operates at either the 900  MHz  or 1800 MHz frequency band. In Europe, operates in the 900MHz and 1.8GHz bands and in US, operates 1.9GHz and 850MHz bands. The GSM is a circuit-switched system that divides each 200 kHz channel into eight 25 kHz time-slots. Cell phones use GSM network by searching for cell phone towers in the nearby area. GSM carriers have roaming contacts with other GSM carriers and typically cover rural areas more completely. GSM also has the advantage of using SIM (SubscriberIdentityModule) cards. The SIM card, which acts as your digital identity, is tied to your cell phone service carrier’s network rather than to the handset itself. This allows for easy exchange from one phone to another without new cell phone service activation. Today, more than 690 mobile networks provide GSM services across 213 countries and GSM represents 82.4% of all global mobile connections. According to GSM World, there are now more than 2 billion GSM  mobile phone users worldwide. GSM World references China as the largest single GSM market, with more than 370 million users, followed by Russia with 145 million, India with 83 million and the USA with 78 million users. GSM network architecture The GSM network is divided into three major systems: The operation and support system (OSS) The switching system (SS) The base station system (BSS)     Ã‚   GSM network architecture The Operation and Support System (OSS) The OSS stands for operation and support system. The function of OSS is that monitors and controls the system. The aim of OSS is that customer cost-effective support for centralized, regional, and local operational and maintenance activities that are needed for a GSM network. An important task of OSS is to ensure a network overview and support the maintenance activities of different operation and maintenance organizations. The Switching System The switching system (SS) is responsible for performing call processing and  Subscriber-related functions. The switching system (SS) includes some functional units: Home location register (HLR)—The HLR is a database used for storage and management of subscriptions. The HLR stores permanent data about subscribers, including a subscribers service profile, location information, and activity status. When a person buys a subscription, he/she is registered in the HLR of that operator. Mobile services switching center (MSC)—The MSC performs the telephony switching functions of the system. It controls calls to and from other telephone and data systems. Also, it performs toll ticketing, network interfacing, common channel signaling, and others functions. Visitor location register (VLR)—The VLR is a database that contains temporary information about subscribers that is needed by the MSC in order to service visiting subscribers. The VLR is always integrated with the MSC. When a mobile station roams into a new MSC area, the VLR connected to that MSC will request data about the mobile station from the HLR. Later, if the mobile station makes a call, the VLR will have the information needed for call setup without having to interrogate the HLR each time. Authentication center (AUC)—A unit called the AUC provides authentication and encryption parameters that verify the users identity and ensure the confidentiality of each call. The AUC protects network operators from different types of fraud found in todays cellular world. Equipment identity register (EIR)—The EIR is a database that includes information about the identity of mobile equipment that intercepts calls from stolen, unauthorized, or defective mobile stations. The Base Station System (BSS) All radio-related functions are performed in the BSS, which consists of base station controllers (BSCs) and the base transceiver stations (BTSs). BSC—The BSC provides all the control functions and physical links between the MSC and BTS. It is a high-capacity switch that provides functions such as handover, cell configuration data, and control of radio frequency (RF) power levels in base transceiver stations. BTS—The BTS handles the radio interface to the mobile station. The BTS is the radio equipment (transceivers and antennas) needed to Service each cell in the network. BSC controls a group of BTSs. MS MS stands for Mobile Station. It is a combination of terminal equipment and subscriber data. The terminal equipment is called ME (Mobile Equipment) and the subscribers data is stored in a separate module called SIM (Subscriber Identity Module). Therefore, ME + SIM = MS. The SIM card contains an identification number of the user and list of available networks. What is Roaming? Roaming allows a mobile subscriber to automatically make and receive voice calls, send and receive data, or access other services when travelling outside the geographical coverage area of their home network, by means of using a visited network. Roaming is technically supported by mobility management, authentication and billing procedures. Establishing roaming between network operators is based on – and the commercial terms are contained in – dedicated roaming agreements. If the visited network is in the same country as the home network, this is known as national roaming. If the visited network is outside the home country, this is known as international roaming. If the visited network operates on a different technical standard than the home network, this is known as inter-standard roaming. GSM Roaming, which involves roaming between GSM networks, offers the mobile subscriber the convenience of being able to use a single number, a single bill and a single phone. The convenience of GSM Roaming has been a key driver behind the global success of the GSM Platform. The GSMA’s  GSM Coverage Maps  are a unique resource containing information supplied and approved by the members of the Association. The network, services and roaming information are continually updated to reflect the evolving situation worldwide. Interactive coverage maps, updated quarterly, allow you to navigate to see where exactly you can use your phone. What is GRAN? GRANis an abbreviation of  GSMRadio Access Network. It consists of  Base Transceiver Stations  (BTS) and  Base Station Controllers  (BSC). Its purpose is to manage the radio link between  mobile phones  and a  telecommunicationcore network. This access network provides access to both  Circuit switched  (CS) and  Packet switched  (PS) core networks. Aradio access network(RAN) is part of a mobile  telecommunication  system. It implements a  radio access technology. Conceptually, it resides between devices like a mobile phone, a computer, or any remotely controlled machine and provides connection with its  core network  (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. Network Management Subsystem (NMS) The Network Management Subsystem (NMS) is the third subsystem of the GSM network in addition to the Network Switching Subsystem (NSS) and Base Station Subsystem (BSS). The purpose of the NMS is to monitor various functions and elements of the network. The operator workstations are connected to the database and communication servers via a Local Area Network (LAN). The database server stores the management information about the network. The communications server takes care of the data communications between the NMS and the equipment in the GSM network known as â€Å"network elements†. These communications are carried over a Data Communications Network (DCN), which connects to the NMS via a router. The functions of the NMS can be divided into three categories: Fault management Configuration management Performance management These functions cover the whole of the GSM network elements from the level of individual BTSs, up to MSCs and HLRs. Fault management The aim of fault management to detect different type of problems then solve them rapidly. Fault management provides the network operator with information about the current status of alarm events and maintains a history database of alarms. The alarms are stored in the NMS database and this database can be searched according to criteria specified by the network operator. Configuration management The purpose of configuration management is to maintain up-to-date information about the operation and configuration status of network elements. Specific configuration functions include the management of the radio network, software and hardware management of the network elements, time synchronization, and security operations. Performance management In performance management, the NMS collects measurement data from individual network elements and stores it in a database. On the basis of these data, the network operator is able to compare the actual performance of the network with the planned performance and detect both good and bad performance areas within the network. Requirement need for building GSM Hardware and software A typical GSM base station, can’t do anything without a suite of components that maintain databases, perform call- ­switching functions, and so forth. This infrastructure is expensive (typically around $250,000) and complicated to configure, and it needs to be stored in an air-conditioned room. Obviously, that’s impractical in the kinds of places  ­OpenBTS is designed for. As a result, the system replaces much of the physical infrastructure of the core network with VoIP software–in this case, an open-source program called Asterisk that can be installed on any off-the-shelf PC. IP Connection Cell-phone users on an OpenBTS network can reach each other even if the system isn’t connected to the Internet, but reaching someone outside the network requires an Internet connection. On Niue, the group used five-gigahertz IP radios to link the BTS unit to Telecom Niue’s wired Internet infrastructure, four kilometers away. Burgess says that response time can get a bit sluggish if the Internet connection isn’t very good, but it doesn’t take much bandwidth to make the system functional. Power supply The system deployed on Niue draws about 60 watts of power, supplied by three marine batteries of the type that many locals use on their boats. Because the system’s power requirements are so low, Burgess says, a base station could also run on solar or wind power. GSM  handset OpenBTS re-creates the technology behind GSM (the global system for mobile communications), which is used by the majority of mobile phones in the world. Any GSM phone will â€Å"see† an OpenBTS network as a standard cell network and interact with it normally. Antenna Like any cell network, an OpenBTS system requires an antenna to facilitate signaling. Different types of antennas can be used, according to the range the operator wants the network to have. Generation of GSM First generation technology(1G) First-generation mobile systemsused analog transmission for speech services. It offered handover and roaming capabilities, but it was unable to interoperate between countries. So, this is disadvantage of first-generation. Second generation technology(2G) Second generation mobile system used digital transmission. It able to use handover and roaming capabilities. It uses FDMA, TDMA, and CDMA. Third generation technology(3G) Third generation technology has fast data transfer rate. It enables to add services like mobile television, GPS, and video conferencing. Services include a wide area wireless voice telephony, video call, and broadband wireless data, all in mobile environment. Fourth generation technology(4G) Fourth generation technologyhas more bandwidth and services than 3G. The expectation for the 4G technology is the high quality audio/video streaming overend to end Internet Protocol, and work at 100 Mbps for mobile users and upto 1 Gbps over fixed stations. The word â€Å"MAGIC† also refers to 4G wireless technology which stands for Mobile multimedia, Any-where, Global mobility solutions over, integrated wireless and Customized services. Fifth generation technology (5G) Fifth generation technology has changed the means to use cell phones within very high bandwidth, high connectivity, and has extraordinary data capabilities. User never experienced ever before such a high value technology. The 5G technologies include alltype of advanced features which makes5G technology most powerful and in huge demand in near future. 5G technology including camera, MP3 recording, video player, largephone memory ,dialing speed, audio player and much more you never imagine. 5G technology going to be a new mobile revolution in mobile market, so may be incoming days 5G technology takes over the world market. Conclusion Year by year, the GSM system improves and its subscribers increases around the world. It divides into three main parts that are OSS, SS, and BSS. These parts include some important department that manages the system, stores information of users, and another tasks. GSM has ability to roam worldwide and has roaming agreements in place with foreign operators globally. So, users can easily use their same SIM in another cities or countries. GSM network facilitate easier access to cellular and satellite platforms across international lines. Using digital technology, it employs both speech and data channels in its system. In addition, GSM has network management subsystem that detects problems and solves them, maintains information up to date, and detects good and bad performance of a network. References http://searchmobilecomputing.techtarget.com/definition/GSM http://en.wikipedia.org/wiki/GSM_radio_access_network http://en.wikipedia.org/wiki/Radio_access_network http://www.gsma.com/aboutus/gsm-technology/roaming https://www.eff.org/files/filenode/global_system_for_mobile_communication_technology.pdf http://www.tutorialspoint.com/gsm/gsm_overview.htm http://cellphones.about.com/od/phoneglossary/g/gsm.htm http://www.academia.edu/3099956/Generations_of_Wireless_Communication._From_0G_to_5G_Abhi http://www.technologyreview.com/hack/418552/build-your-own-cellular-network/

People work because they need money to live

People work because they need money to live. What are some other reasons that people work. Discuss one or more of these reasons. Use specific examples and details to support your answer. By devochkacluny People work because they need money to live. What are some other reasons that people work. Discuss one or more of these reasons. use specific examples and details to support your answer. Some people work because they need money to live. I do not agree with this idea. In my opinion, to Improve myself, broaden my perspective and discipline myself are what I expect from work.As these will be ingrained in me forever, It does not like money which is finally used up. Nowadays, business is highly competitive. Companies have to produce goods and services rapidly. They require competent employees who are able to work effectively. Competent employees should be a fast-learning person who can work Immediately without much training. They need to put their time and energy to finish their Job respo nsibility correctly and quickly. As a result, we have to Improve ourselves to be competent employees who are able to work in todays world. Moreover, I work in order to broaden my erspective.In working life, we come Into contact with many people such as customers, supervisors, colleagues and subordinates. We have to communicate with people having different backgrounds and behaviors which enable us to learn and try to adjust ourselves to work with the differences. Very often, I need to work as a team In order to brainstorm ideas. I usually get many new ideas from others which I have never thought about them before. It significantly helps me widen my perspective. Working also helps us to become more disciplined. Workers have to follow corporate rules and regulations.They have to work continuously during work time. Furthermore, they have to be evaluated their job performance whether they should be promoted or whether they are unqualified for such position causing them to maintain their performance well all the time. These kinds of behavior will finally become a habit because we do It In everyday definitely helping us to develop self- discipline. In sum, from my perspective, I work in order to improve myself, broaden my perspective and discipline myself because these things will help me to be a valuable person. It cannot definitely happen, If we do not work.

Burning man festival vs. Quiverfull movement

Members Of the Quivers movement should be admired for the dedication they put into what they believe is right. They also cause harm in several ways, including homecomings, not having enough money to care for each child, and the affect it is creating on the environment. In comparison to the Burning Man festival, its flaws are there is a lot of partying, sex, and drugs, along with the use of gallons of fossil fuels. Its positive attributes are it causes less damage because it represents unity between people and their ability to express themselves through their artwork.The members of the Quivers movement should be respected, because their religious beliefs require much faith. They are motivated by what the bible says and firmly believe that God is in control. They adopt this lifestyle, because in the Bible it says to â€Å"be fruitful and multiply' (13). This statement can be looked at among many different perspectives. The members of this movement believe God will decide when you are done having children. One mother describes this movement as â€Å"God is bringing revelation on the world. He wants to raise up His army, He wants His children to be†(1 3).In that case, if a woman uses any source of birth control, she is going against what God has intended. Also, since God is in control, overpopulation is not a problem, because He will provide a new earth. One woman that is a part of the Quivers movement said, â€Å"Children are a blessing, a reward, an inheritance. Don't worry about money†¦ Because God will provide for his flock† (14). Members of this movement take pride in their children and see them as a gift from God. They cherish the idea of the greater amount of children each Christian family has, the bigger the Christian immunity will become.However, this movement also has flaws. One is homecomings. The thought of homecomings six children or more everyday seems strenuous. In the article, one woman said she believes â€Å"home- schooling mo vements are a sign of revival† (13). She also says that there is too much selfishness in this world and people will do anything just to make their lives easier. I disagree with her Statement because if you hemlocks your children, they won't be able to spread the word of God to others. If your kids are homesteaded, how will your children make friends other than at church?When it comes times for these children to go to college, they will not know how to react to people that do not have the same world views as them. They will be so used to being around their siblings, and will not know any different from what they have been taught to believe. In my opinion, it is more beneficial for children to go to a real school where they can socialize with other children other than their siblings. Sheltering your kids for eighteen years can ultimately harm them when they go off into the real world and are not used to the variety of beliefs.The second way the Quivers movement is problematic is that it can be very expensive to raise a large number of children. First of all, babies require many necessities in order to stay healthy such as baby formula, diapers, a crib, and clothes. As they start to grow up they will need bigger clothes and shoes, car seats, and a bigger bed. Imagine having to provide this for six or more children. Likewise, little kids also tend to need a lot of food. The amount of food you would need just for one meal can be very expensive.Having to provide that many meals each week can become unhealthy and might not give your children the full nutrition they need. The article talks about how the Quivers movement is based on faith. They must have faith that God wont give woman â€Å"more children than they can handle,† and that they will receive multiple â€Å"blessings† if they open themselves up (14). They have faith that God will provide clothes for their children, and their husbands will get better jobs if they submit to this lifestyle. Living a lifestyle where you are constantly relying on other people for support can be very stressful and demanding.The third reason that this movement can be harmful to the environment is if each family started having so many children, this could lead to overpopulation. More schools would have to be built, and families would need bigger houses and more cars for transportation. The problem with this is that our society does not have the resources it would need to care for that many people. There are already thousands of people that go to bed hungry every night. For example, in China, you are only allowed to have one child per family because of the problem of overpopulation.If there countries already are dealing with this issue, adding to this number would not be beneficial to that problem. In the article, one woman states that in her belief system God is going to provide us with a new earth, and our only job is to ‘be fruitful and multiply' (13). For that reason, she believes we don't need to worry about overpopulation being a problem. People of this movement are not taking into account the issues that can bring on our society. The Burning Man festival also exhibits some flaws. One flaw is that there is a lot of partying, sex, and drugs involved. This can lead to many different physical and sexual problems.For example, if people are going around having sex with other people they do not know, this could put them at risk of many diseases. People come to this event with a desire for union and communion. After they get there, their desire turns into a want for eccentric behavior. For example, Johnson says that as the workers are setting up for the festival, everyone is very kind and caring towards one another. When the crowd arrives, the â€Å"energy begins to corrupt' and the people become hedonistic (23). Johnson describes this as ‘the fall† and that ‘the Playa is the very theater of their acting out† (23).Another flaw the Burning Man festival exhibits is that it requires thousands of gallons of fossil fuels, twelve- volt batteries, generators, and computerized reservations of rental trucks and Revs. Johnson makes a good point about how the event is an experiment in â€Å"radical self- reliance,† yet it uses all of those things (22). This is hypocritical to the purpose of the festival, because it is supposed to be a place to get away from the worldly matter and adapt to the culture. Johnson discusses that the organizers should commit to the idea of â€Å"burning green† as the theme one year.By doing this, they would ban generator- powered installations and limit Revs to one per site. However, the Burning Man festival causes less harm and has a more positive influence on those who attend. Why would someone want to camp out in the desert for eight days anyways? The motive behind the Burning Man festival is to develop new relationships and to learn to live in harmony with the planet. It is a place where people can go to get away from everyday life. Feldman says in his article that people go to â€Å"see a shared unman impetus for radicalized gatherings relating to the desire for freedom and transformation† (18).He compares Burning Man to the Jewish religion in that the festival is like the Sabbath because both yearn for a better world. He states â€Å"the creation of this separate reality in time and place heightens the experience of being alive and awakens the desire for a better world, precisely because we are temporarily taken out of our usual routines and surroundings† (19). This idea is compared to the Garden of Eden in that for that week they are â€Å"the dust of the earth† waiting for transformation. Another positive aspect of the Burning man festival is the artwork.Johnson talks about the different types of artwork and how each one is vastly different than the next. He explains the many different textures, materials, sizes, and styles he admires. Johnson appreciates that the art in the Burning man festival is an expression of love instead of narcissism. The Burning Man website claims that â€Å"participants found significant new relations pips or resolve to undertake ambitious projects as a result of their experience† (21 People do not come to this festival to show off their creativity but rather to lid relationships through it.

How Riluzole Is A Derivative Of Benzothiazole Essay

2.11.1 Structure: riluzole is a derivative of benzothiazole (Hofmann, 1879), a bicyclic ring compound which comprises a benzene ring fused with five membered ring containing one sulfur and one nitrogen atom. It has the molecular formula C8HÂ ¬F3N2OS with a molecular weight of 234.20. 2.11.2 Properties: Riluzole is white to slight yellow powder soluble in dimethylsulfoxide, dimethylformamide and methanol, freely soluble in dichloromethane, sparingly soluble in 0.1 N HCl and very slightly soluble in water and 0.1 N NaOH. Riluzole is available as a capsule-shaped, white, film-coated tablet for oral administration. Each tablet contains 50 mg of riluzole. It is marketed by Sanofi-Aventis with the brand name Rilutek. 2.11.3 Side-effects or damaging effects Riluzole is a very good neuroprotective drug, but it has some side-effects associated with it that includes nausea, vomiting, anorexia, diarrhea, asthenia, somnolence, vertigo, circumoral paresthesia, abdominal pain and dizziness (Siniscalchi, 1997). Remy et al has reported cases of two patients who have developed acute hepatitis (hepatocellular damage with inflammatory infiltration and microvesicular steatosis without fibrosis) after taking riluzole at the recommended dose (100 mg daily) for 7 and 4 weeks, respectively. In both cases, liver histology showed liver enzymes returned to normal 4 and 8 weeks, respectively, after riluzole withdrawal (Remy, 1999). 2.11.4 Mechanism of actions Riluzole has emerged as a potent