★ The cell radius could be double or even more, based on the antenna, type of terrain and timing advance.
★ Indoor coverage is supported by GSM and could be achieved with the usage of picocell base station or an indoor repeater along with distributed indoor antennas.
★ Extended cell feature enables the operators for extending the coverage without installing new cell cites.
★ Extended cell feature is designed specifically for providing covering in rural areas, where density of population is low and installation of additional cell sites.
★ New features can be deployed in coastal areas for providing GSM coverage in offshore waters.
★ Time Division Duplexing, a 3GPP standardized version of Universal Mobile Telecommunications System networks.
★ The designated mobile sends the data in a stipulated time and receives data from the BTS in another time.
★ The time is divided into various time slots and user sends data in few time slots and receives the data in the rest of the time slots.
★ Alternative downlink and uplink directions are used.
★ Frequency Division Duplex is one of the techniques, in which one frequency band is utilized for transmitting and another used for receiving.
★ To up-link the carrying data from mobile phones to the base station, one electromagnetic block spectrum is allocated.
★ Various blocks of spectrum is allocated to down-link carrying data from the base station to the mobile telephone hand sets.
★ Power control is the intelligent selection of transmit power in a communication system for achieving best performance within the system.
★ The performance is depend on context and there are chances to include optimizing metrics like link data rate, network capacity, geographic coverage and range.
★ A higher transmit power translates into a higher signal power at the receiver.
★ The bit error rate will be reduces at the receiver of a digital communication link, by having higher signal-to-noise ratio.
★ Higher transmit power provides more protection against a signal fade in a wireless fading channel.
★ Absolute Radio Frequency Channel Number, a code to specify a pair of physical radio carriers and channels within the spectrum that is allocated for cellular mobile communications.
★ ARFCN is used for transmitting and receiving on the UM Interface, one to uplink signal and one to downlink signal.
★ ARFCN's bandwidth is 270.833 kHz; channel spacing is 200 kHz in a given GSM band.
★ The uplink-downlink spacing is generally 45 / 50 MHz.
★ If Frequency Division Duplex is operated in the system, then the channel number is associated with both uplink and downlink radio channels.
★ ARFCN is 1-124 within GSM900 spectrum, 512-885 within GSM1800, 512-810 within GSM1900, are used.
★ Mobile Subscriber Integrated services Digital Network Number, a unique number identifying a subscription in a GSM / UMTS mobile network.
★ It is the telephone number of the SIM card in a mobile phone.
★ MSIDN and IMSI are important numbers used to identify a mobile subscriber
★ MSIDN is used for routing the calls to the subscriber, where as IMSI identifies the SIM.
★ In the HLR, the IMSI is the key, and MSIDN is the number that is dialed for connecting a call to the mobile phone.
★ International Mobile Equipment Identity is a number usually unique for identifying GSM,WCDMA and iDEN mobile phones.
★ It is generally printed inside the battery compartment of the phone.
★ The number can be displayed on the screen by entering *#06# into the keypad on most of the phones.
★ A stolen phone can be stopped from accessing the network within the country, by using IMEI number for valid devices.
★ Unlike CDMA/MEID's electronic serial number, the IMEI is only used for identifying the device and has no permanent relation to the subscriber
★ The subscriber is identified by IMSI number, stored on the SIM card, which then can be transferred to any other handset.
★ Temporary Mobile Subscriber Identity for most commonly sent between the mobile and the network.
★ TMSI is assigned randomly by VLR to each mobile in the area.
★ The TMSI number is local for a specific local area, and need to be updated every time when the mobile moves to a new geographical area.
★ Paging a mobile is the key use of the TMSI.
★ The communication between the mobile and the base station is known as paging.
★ The emphasis of broadcast information is top set up channels for paging.
★ Broadcast mechanism is available in every cellular system for distributing broadcast information to a plurality of mobiles.
★ International Mobile Subscriber Identity - a unique identification that is associated with all GSM and UMTS network mobile phones.
★ The SIM inside the phone contains it as a 64 bit field.
★ Used for acquiring certain details in Home Location Register or Visitor Location Register.
★ IMSI is rarely sent for preventing eavesdroppers to identify and track the subscriber on the radio interface.
★ It is presented as 15 digit long number, where first 3 digits represent the Mobile Country Code and followed by the Mobile Network Code.
★ Remaining digits are mobile station identification number within the customer base network.