15A05703 - Mobile Application Development

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15A05703 - Mobile Application Development



Mobile Application Development  Notes - UNIT 1

Mobile Application Development  Notes - UNIT 2

Mobile Application Development  Notes - UNIT 3 Part 1

Mobile Application Development  Notes - UNIT 3 Part 2

Mobile Application Development  Notes - UNIT 4 

Mobile Application Development  Notes - UNIT 5 

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CSMA/CD

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Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Carrier sense multiple access with collision detection (CSMA/CD) augments the algorithm to handle the collision. CSMA/CD method, a station monitors the medium after it sends a frame to see if the transmission was successful. If so, the station is finished. If, however, there is a collision, the frame is sent again. To better understand CSMA/CD, let us look at the first bits transmitted by the two stations involved in the collision. Although each station continues to send bits in the frame until it detects the collision, we show what happens as the first bits collide. In below figure stations A and C are involved in the collision. At time t1, station A has executed its persistence procedure and starts sending the bits of its frame. At time t2, station C has not yet sensed the first bit sent by A. Station C executes its persistence procedure and starts sending the bits in its frame, which propagate bo...
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ALOHA

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RANDOM-ACCESS METHODS The random-access methods we study in this chapter have evolved from a very interesting protocol known as ALOHA, which used a very simple procedure called Multiple Access (MA). The method was improved with the addition of a procedure that forces the station to sense the medium before transmitting. This was called carrier sense multiple access (CSMA). This method later evolved into two parallel methods: carrier sense multiple access with collision detection (CSMA/CD), which tells the station what to do when a collision is detected, and carrier sense multiple access with collision avoidance (CSMA/CA), which tries to avoid the collision. ALOHA ALOHA, the earliest random access method, was developed at the University of Hawaii in early 1970. It was designed for a radio (wireless) LAN, but it can be used on any shared medium. It is obvious that there are potential collisions in this arrangement. The medium is shared between the stations. When a station sen...
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