Answer Posted / malik muhammad mehran

GSM- Gloabl system for mobile communication.
- Groupe speciale for mobile communication which is the
name of group which worked for this standard to implement
in europe.
- In 1991 eleven countries of the europe implemented this
standard.
- The first country which implemented this standard was
Finland.
- Each operator is Bestow with the 25MHZ band.
- Use three bands 900/1800/1900MHZ.
- Having data bases HLR, VLR, EIR and AUC.
- Having elements ME, BSS, NSS.
- Use Digital Air interface.
- 25MHZ is divided into 124 channels of 200khz.
- Each channel can support 8 users.
- Each user is allocated 0.577ms time slot in the 8 user
supporting frame.
- Total 4.615ms frame is used for the 8 users.
- Then multi frame is based on 26 eight user supporting
frames(multiframe is of 120ms duration).
- Then comes a supper frame which is consists on 51
multiframes(super frame is of duration 6.12s).
- Then comes Hyper frame consists on 2048 supper frames
(Hyper frame is of duration 3.4816 Hours).

What is discontinuous transmission in gsm technology?

898

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Explain the maximum data rate supported by a gsm system?

822

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Explain about ms-idn in gsm technology?

890

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What is hsn in gsm technology?

984

---

Explain synthesised frequency hopping?

821

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Explain fdd?

1156

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What is the main difference between gsm and cdma?

815

---

Explain dtx?

961

---

Explain what is the relation between rxlev [0 to 63] and rxlev [-110 to -47]?

891

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Explain what is the deference between rx lev sub and rx lev full?what you mean by link budget?

967

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What do you mean by extended cell? Does it have any impact on the system? If yes, what?

873

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Describe GSM with one of advantage?

882

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Explain interleaving?

874

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What is frequency re-use?

862

---

What is cycling frequency hopping in gsm technology?

839

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