Personal Wireless Communications: The 12th IFIP by María Canales, José Ramón Gállego, Ángela Hernández-Solana,

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By María Canales, José Ramón Gállego, Ángela Hernández-Solana, Antonio Valdovinos (auth.), Robert Bestak, Boris Simak, Ewa Kozlowska (eds.)

International Federation for info Processing

The IFIP sequence publishes cutting-edge ends up in the sciences and applied sciences of knowledge and verbal exchange. The scope of the sequence contains: foundations of laptop technology; software program concept and perform; schooling; machine functions in know-how; conversation platforms; structures modeling and optimization; details platforms; desktops and society; desktops know-how; safety and defense in info processing platforms; man made intelligence; and human-computer interplay. complaints and post-proceedings of referred foreign meetings in machine technological know-how and interdisciplinary fields are featured. those effects frequently precede magazine booklet and characterize the most up-tp-date examine. The significant objective of the IFIP sequence is to inspire schooling and the dissemination and trade of knowledge approximately all points of computing.

For additional info in regards to the three hundred different books within the IFIP sequence, please stopover at www.springer.com.

For additional information approximately IFIP, please stopover at www.ifip.org.

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Additional info for Personal Wireless Communications: The 12th IFIP International Conference on Personal Wireless Communications (PWC 2007), Prague, Czech Republic, September 2007

Example text

Logically, the higher ASIR, the lower the 22 PWC 2007 error rate. However, an increase in ASIR implies a reduction in the effective coverage area, and consequently, in the number of terminals allowed to establish data communications. Thus, excessively high values for ASIR can lead to a higher probability of unconnected network. In the evaluation of point to point data services, a ASIR = 10 dB has been chosen as a tradeoff between effective coverage area and reliability (error rate). Regarding the election of a, in addition to the error rate, the capacity of reliably determining the set of stable neighbors is also important in order to establish efficient data communications.

The election of the specific value for SIRcoiHsion implies a tradeoff in the protocol design. High values, near the SIR that all the stable neighbors must guarantee when there is no interference {SIRth + ASIR — Prx,min — Pn iii dB) lead to mistakes between channel errors and collisions. On the other hand, low values near SIRth can disguise the existence of a collision, leading to keep on transmitting in a slot where the interference level has notably grown, with the subsequent increase in the packet error rate.

Therefore, adhoc networks play an increasing role in network access. Ad-hoc networks differ clearly from the traditional cable infrastructure. This kind of networks is characterized by very dynamic changes of topologies and hence their design requires special attention. To support the present users and service requirements, the ad-hoc network needs to support differentiated QoS, which is a major challenge. , topology, new sessions, congestion). There are some solutions for QoS support in ad-hoc networks: SWAN (Stateless Wireless Adhoc Networks) [4], INSIGNIA [6], FQMM (Flexible Quality of service Model for Mobile ad-hoc networks) [5], and DS-SWAN (Differentiated Services-SWAN) [17].

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