Chapter 2 Part 3 – Wireless Networks

Q 3) Using traffic data packet per cell for a GSM/GPRS network.

Calculate (a) data Erlangs, (b) time slot (TS) TS utilization and (c) TS capacity.
Use the following data :

No of BTS: 40

Subscriber usage per month: 150 minutes

Days per month: 24

Busy hours per day: 6

Allocated spectrum: 4.8Mhz

Frequency reuse plan: 4/12

RF channel width: 200 kHz (full rate)

Present number of subscribers in a zone: 50,000

Subscriber growth per year: 5%

Network roll-over period : 4 years

Number of packet calls per session (NPCS) : 5

Number of packets within a packet call (NPP): 25

Reading time between packet calls (Tr): 120 s

Packet size (NBP): 480 bytes

Chapter 2: Planning and Design of Wide Area Wireless Networks Numericals. Mumbai University, Semester 8. Electronics and Telecommunications Engineering.

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