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 ($T_r$) : 120 s

• Packet size (NBP) : 480 bytes