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A COMPARISON OF ISMA AND DECT-DCS CHANNEL ACCESS POLICIES FOR INDOOR WIRELESS
 

Summary: A COMPARISON OF ISMA AND DECT-DCS CHANNEL
ACCESS POLICIES FOR INDOOR WIRELESS
COMMUNICATIONS SYSTEMS
R. C. Atkinson & J. Dunlop
ABSTRACT
This letter considers two channel allocation schemes for the indoor environment:
a mobile-controlled scheme representative of DECT's Dynamic Channel
Selection (DCS), and basestation-controlled inhibit sense multiple access
(ISMA). It is shown that the mobile-controlled scheme is subject to inferior
performance in packet based voice transmission due to a higher degree of front
end clipping which is introduced.
INTRODUCTION
This letter assesses channel access mechanisms for indoor 3G mobile
communications systems offering packet based services. One such service in
which the channel access mechanism will have a significant impact is Voice over
Internet Protocol (VoIP).
At present most indoor coverage is provided by illumination from external
macrocellular base stations. However, as the number of subscribers continues to
grow this approach may not meet the required capacity since active users of all
buildings within the beam-width of the BS antenna must share the limited

  

Source: Atkinson, Robert C - Department of Electronic and Electrical Engineering, University of Strathclyde

 

Collections: Engineering