Subject Code : ITEC851

Assignment Task:

ITEC851: Mobile Data Networks  IT Assignment Help

1.  A CDMA system includes two stations X and Y. The Walsh codes for stations X and Y are (-1 1 -11 -1 1 -11) and (-1 -111 -1 -111) respectively.

a. Show the output at the receiver, if X transmits a data bit 1 and Y does not transmit 

b. Show the output at the receiver, if X transmits a data bit 0 and Y does not transmit  

c. Show the output at the receiver, if X transmits a data bit 1 and Y transmits a data bit 1. Assume the received power from both X and Y is the same 

d. Show the output at the receiver, if X transmits a data bit 0 and Y transmits a data bit 1. Assume the received power from both X and Y is the same 

e. Show the output at the receiver, if X transmits a data bit 1 and Y transmits a data bit O. Assume the received power from both X and Y is the same 

f. Show the output at the receiver, if X transmits a data bit 0 and Y transmits a data bit O. Assume the received power from both X and Y is the same 

g. Show the output at the receiver, if X transmits a data bit 1 and Y transmits a data bit 1. Assume the received power from Y is twice the received power from X; this can be represented by showing the received signal component from X as consisting of elements of magnitude 1(+1, -1) and the received signal component from Y as consisting of elements of magnitude 2 (+2, - 2)

h. Show the output at the receiver, if X transmits a data bit 0 and B transmits a data bit 1. Assume the received power from Y is twice the received power from X 

2. The dual busy tone multiple access (DBTMA) scheme splits the single common channel into two sub-channels: a data channel and a control channel.

Data packets are transmitted on the data channel. Control packets (RTS/CTS) are transmitted on the control channel. Explain the rationale behind this design principle. Identify and explain two key limitations of this scheme.

3.a. Identify and explain two main causes of collision in 802.11 mobile ad hoc networks. 

b.  It is argued that using the fragmentation scheme of CSMA/CA for data transmission results in performance improvement. Explain why? Highlight and briefly explain a few deficiencies of this approach to data transmission. 

4. a. Assume there is a bidirectional transmission (e.g. DATA/ACK or RTS/CTS/DATA/ACK) using the 802.11 protocol between a pair of nodes. In this scenario, is it possible for a node that is currently an exposed node to any one node in this transmitter-receiver pair, to be a hidden node when the roles of the transmitting and receiving nodes are switched? If yes, then explain how with the aid of an example. If no, then explain why. 

b. Highlight and explain the key limitations of the binary exponential back-off (BEB) algorithm that is used in CSMA/CA. Explain how the multiplicative increase and linear decrease (MILD) algorithm used in the MACAW protocol can address these deficiencies. Explain why the MILD algorithm may also suffer from performance degradation. 

5. Consider a novel Mobile IP scheme in which a mobile station announces its permanent (home) IP address to agents in foreign networks. These agents, in turn, announce this information to other routers using their regular routing protocol update messages. What are some benefits and drawbacks of this scheme when compared to the IETF Mobile IP scheme? (300 Words)

6. (Refer to figure 1) An organization has deployed a campus network using cellular IP. The cellular IP network extends the wired infrastructure of the campus as shown in figure 1 below. The gateways in cellular IP connect their respective wireless segments to the wired segment. Each Base Station in the wireless segment provides layer 3 functionality (in other words, they act as IP forwarding engines). The campus network supports multicast routing. All the components in the wireless part strictly adhere to cellular IP standard. Assume that this campus network deploys a Source Based Multicast Routing scheme – a protocol that builds source based multicast distribution trees (Refer to the appendix for a brief explanation on Source Based Multicast Routing)

A visiting mobile node MN enters the wireless network and initially gets registered to its home network via BS1-G1 and acquires a Care of Address (CoA - an address from the campus network address space). The CoA assigned to the MN remains unchanged irrespective of MN’s movements within the campus network. In other words, MN does not need to acquire a new CoA upon moving to a wireless segment under the same or under a different gateway. While initially at BS1, the MN joins a multicast group G whose scope is local to this campus network (all sources, and members reside in the campus network). Assume that hosts H1, H3, H5, and H7 are members of this group with H1 and H7 also acting as Multicast sources. Furthermore, assume that MN itself is a source for multicast traffic. In this scenario, explain what problems can arise in multicast communication due to MN’s mobility. 

 

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  • Posted on : November 18th, 2018

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