Friday, February 29, 2008
Thursday, February 28, 2008
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Monday, February 25, 2008
Friday, February 22, 2008
Sunday, February 17, 2008
Friday, February 15, 2008
Tuesday, February 12, 2008
Monday, February 11, 2008
There are different packet scheduling algorithms for wireless networks which tries to ensure fairness and QoS. A scheduling algorithm must satisfy the following requirements. It should be easier to implement and the order of complexity should be o (1) not o (N). Performance bounds should be deterministic or statistical. Other parameters like Bandwidth, delay, jitter and loss should be easy to monitor and all these values should be close to optimum values. Fairness and protection should be ensured to each and every flow that is associated with a link. In our project we are considering three such algorithms and compare their performance based on the throughput and bandwidth analysis. The algorithms are Weighted Round Robin, Deficit Round Robin and Opportunity based Deficit Round Robin.
Friday, February 8, 2008
Tuesday, February 5, 2008
A basic cellular system has several mobile stations, base stations and mobile switching centers. The mobile switching center is sometimes called as mobile telephone switching office, since it is responsible for connecting all the mobile phones to the PSTN in a cellular system. Each mobile communicates with the help of a radio with one of the base stations and may be handed off to any number of base stations throughout the duration of a call. The mobile station contains a transceiver, an antenna, and control circuitry, and may be mounted on a vehicle or used as a portable hand held unit. The base station consists of several transmitters and receivers which simultaneously handle full duplex communications and generally have towers which support several transmitting and receiving antennas. The base station serves as a bridge between all the mobile users in the cell and connects the simultaneous mobile calls via telephone lines or microwave links to MSC. The MSC coordinates the activities of all the base stations and connects the entire cellular system to PSTN.
Saturday, February 2, 2008
A cellular telephone system can provide connection to the PSTN for any user location within the radio range of the system. Cellular systems accommodate large number of users over a large geographic area, within a limited frequency spectrum. Cellular radio systems provide high quality service that is often comparable to the landline service. High capacity is achieved by limiting the coverage of each base station transmitter to a small geographic location called cell so that the same radio frequency can be reused by another base station located at some other distance. A sophisticated switching technique called hand off enables a call to proceed uninterrupted when the user from one cell to another.