1) What is the total number of Carrier Frequencies that can be formed in a 25MHz band width of either Uplink or Downlink of GSM?
2) What is the spacing between each carrier frequency to avoid interference and crosstalk?
200 KHz x 125 = 25MHz
3) In GSM-1800 band, the total number of Carrier Frequencies are ?
375 x 200KHz = 75 MHz
4) Each Carrier frequency is divided or shared among _______ number of channels.
5) In a GSM-900 Band, what is the duplex spacing between uplink and downlink channels?
6) In a GSM-1800 Band, what is the duplex spacing between downlink and uplink channels?
7) What is the name of a single transmission burst that lasts for only 0.577ms in a GSM TDMA frame?
B) Channel (or Physical channel)
15/22 = 0.577 ms for one channel
8) What is the duration of a GSM TDMA Frame?
9) What are the types of Logical channels in a GSM Structure or Architecture?
A) Traffic channels
C) Common control channels, Dedicated control channels
10) Broadcasting is a concept of transferring information from _______ to _______?
A) One to one
A BTS broadcasts a BCCH to all eligible mobiles for further negotiation.
11) BCCH (Broadcast Control Channel) frequency is also called _________?
12) Majority of the GSM Channels work on ______ interface?
A) Abis interface
Um interface is also called Air interface. It works in between Mobile and BTS.
13) The type of information transferred in Traffic Channel (TCH) is ____ ?
14) Choose a Channel that carries Signalling information?
A) Broadcast Control channel
B) Common control channel
C) Dedicated control channel
15) What is the other type of information that a TCH channel contain or carry?
A) Signalling to forward a call
B) Short Message Service signalling
16) What is TRUE about a Full Rate TCH channel?
A) It carries a speech of 13kbps before encoding
B) It carries a total of 22.8kbs information after channel coding
C) Data rates supported are 3.6, 6 and 12 kbps respectively.
17) What are the data rates of services available in ISDN and other services that can be transmitted in a TCH channel?
18) What is the total bitrate after channel coding in a Half Rate TCH channel?
19) What is the speech rate before coding in a Half Rate TCH channel?
20) Possible data rates in a Half Rate TCH channel are _____ ?