Dynamically stores subscriber information needed to handle incoming/outgoing calls
Mobile Station Roaming Number
When a roaming mobile enters an MSC area. This MSC warns the associated VLR of this situation; the mobile enters a registration procedure through which it is assigned a mobile subscriber roaming number (MSRN)
Temporary Mobile Subscriber Identity, if applicable
The location area in which the mobile has been registered
channel is composed of a series of timeslots of periodicity. Different signal energies are distributed into different timeslots. The adjacent channel interference is restricted by connection choosing from time to time. So the useful signal is passed only in the specified timeslot.
GSM adopts TDMA/FDMA mode
channel width: 200KHz,
each channel has 8 timeslots
User 1 User 2 User 3 Frequency time
GSM Timeslot and Frame structure time Frequency BP 15/26ms 200KHz interval
Frequency Resource GSM900 : up: 890~915MHz down: 935~960MHz duplex interval: 45MHz bandwidth: 25MHz ， frequency interval: 200KHz GSM1800 : up: 1710-1785MHz down: 1805-1880MHz duplex interval: 95MHz ， working bandwidth: 75MHz ， frequency interval: 200KHz EGSM900 : up: 880~890MHz down: 925~935MHz duplex interval: 45MHz bandwidth: 10MHz ， frequency interval: 200KHz GSM1900MHz: up:1850~1910MHz down:1930~1990MHz duplex interval: 80MHz ， working bandwidth: 60MHz ， frequency interval: 200KHz
Frequency Resource 1800MHz 1900MHz 900MHz Single Band Network General Priority High Low For Subscriber For Operator Propagation Characteristic New Operator Which one? Reason
Single Band Network 1800MHz 1900MHz 900MHz Single Band Dual Band Triple Band In a sense, the network determines the handsets can be selected. But nowadays, most handsets support dual band.
Single Band Network Propagation characteristic Cell coverage radius : The higher the propagation frequency The higher the propagation loss The smaller the cell coverage radius. 900MHz 1800MHz 1900MH z We know
The physical channel adopts FDMA and TDMA techs. On the time domain, a specified channel occupies the same timeslots in each TDMA frame, so it can be identified by the timeslot number and frame number.
combined with one traffic channel or SDCCH, to transmit some specific information of user information
Fast Associated Control Channel （ FACCH ）
combined with one traffic channel, taking the same signal as SDCCH. It occupies the service channel to transmit signaling information.
Cell Mode Layout Omni-directional cell Adopt omni-directional antenna ， the overall directional propagation characteristic is the same. Directional cell In general, cell with multi-sector is in common use. Every directional cell adopts directional antenna.
the traffic intensity of a totally occupied channel (i.e. the call hour of a unit hour or the call minute of a unit minute). For example, the traffic of a channel occupied for 30 minutes in an hour is 0.5 Erlang)
defined as the probability of call blocking or the probability when the call delay time is longer than a given queuing time.
CT2 is a cordless telephony standard that was used in the early nineties to provide short-range proto-mobile phone service in some countries in Europe. It is considered the precursor to the popular DECT system.
Digital Enhanced (formerly European) Cordless Telecommunications is an ETSI standard for digital portable phones , commonly used for domestic or corporate purposes. DECT can also be used for wireless data transfers. DECT is recognised by the ITU as
type of wireless telephone network compatible with telephone sets, answering machines, fax machines, and computers. A PACS can be used like a local area network ( LAN ) with voice capability and can be part of a larger network or can be connected into the telephone system.