Network Management Q1) What is a foreign agent and explain its relationship with

Question

Network Management

Q1) What is a foreign agent and explain its relationship with the home agent.

Q2) Give three differences between Multichannel Multipoint Distribution Service (MMDS) and Local Multipoint Distribution Service (LMDS).

Q3) If a total of 33MHz of bandwidth is allocated to a particular FDD cellular telephone system which uses two 25kHz simplex channels to provide full duplex voice and control channels. Calculate the number of channels available per cell if a system uses 4-cell reuses.

Explanation / Answer

3)
Given:Total bandwidth=33MHz
Channel bandwidth=25 kHz × 2 simplex channels=50 kHz/duplex channel
Total available channels = 33000/50 = 660 channels

A 1 MHz spectrum for control channels implies that there are 1000/50 = 20 controlchannels out of the 660 channels available.
>In practice, only the 640 voice channels would be allocated since the control channelsare allocated separately as 1 per cell.
>Here, the 640 voice channels must be equitable distributed to each cell within thecluste

For N = 4
we can have 5 control channels and 160 voice channels per cell. In practice, however, each cell only needs a single control channel (the controlshave a greater reuse distance than the voice channels). Thus, one controlchannel and 160 voice channels would be assigned to each cell

2)
LMDS
>Local Multipoint Distribution Service
>The LMDS architecture consists of NOC (Network Operation Center), BS, CPE and Fiber backbone. It has cellular like architecture.
>Frequency of operation   28 GHz, 36 GHz
>CPE cost and deployment cost is medium to high
>Data rate   1 to 10 Mbps
>Network Topology is P2MP (Point to Multi-point)

MMDS
>Multichannel Multipoint Distribution Service
>The MMDS architecture consists of tall antenna tower, backbone internet connectivity using router and network management system. It has microwave link like architecture
>Frequency of operation 2.5 GHz, 3.5 GHz
>CPE cost and deployment cost is low compare to LMDS.
>Data rate is upto 2Mbps
>Network toplogy is P2P(poin to point)

1)
A foreign agent is a router serving as a mobility agent for a mobile node. As specified in IETF RFC 2002), a foreign agent works in conjunction with another type of mobility agent known as a home agent to support Internet traffic forwarding for a device connecting to the Internet from any location other than its home network.

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