Channel allocation problem in mac

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  1. THE MEDIUM ACCESS CONTROL SUBLAYER 4.1 THE CHANNEL ALLOCATION PROBLEM
  2. Static channel allocation of LAN & MAN.
  3. Navigation menu
  4. Introduction

DCA allows the number of channels in a cell to vary with the traffic load, hence increasing channel capacity with little costs. Spread spectrum can be considered as an alternative to complex DCA algorithms. Spread spectrum avoids cochannel interference between adjacent cells, since the probability that users in nearby cells use the same spreading code is insignificant.

Thus the frequency channel allocation problem is relaxed in cellular networks based on a combination of spread spectrum and FDMA, for example IS95 and 3G systems.

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THE MEDIUM ACCESS CONTROL SUBLAYER 4.1 THE CHANNEL ALLOCATION PROBLEM

Spread spectrum also facilitate that centrally controlled base stations dynamically borrow resources from each other depending on the traffic load, simply by increasing the maximum allowed number of simultaneous users in one cell the maximum allowed interference level from the users in the cell , and decreasing it in an adjacent cell. Users in the overlap between the base station coverage area can be transferred between the cells called cell-breathing , or the traffic can be regulated by admission control and traffic-shaping.

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However, spread spectrum gives lower spectral efficiency than non-spread spectrum techniques, if the channel allocation in the latter case is optimized by a good DCA scheme. Especially OFDM modulation is an interesting alternative to spread spectrum because of its ability to combat multipath propagation for wideband channels without complex equalization.


  1. THE MEDIUM ACCESS CONTROL SUBLAYER THE CHANNEL ALLOCATION PROBLEM;
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One example of this concept is the above mentioned IEEE In packet based data communication services, the communication is bursty and the traffic load rapidly changing. For high system spectrum efficiency , DCA should be performed on a packet-by-packet basis. From Wikipedia, the free encyclopedia. Ethnic groups in the Middle East. African nomads.

Static channel allocation of LAN & MAN.

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Channel Allocation

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