Title :
Free access stack algorithms for microcellular radio systems
Author_Institution :
Dept. of Electr. Eng., Trieste Univ., Italy
fDate :
3/1/1999 12:00:00 AM
Abstract :
We evaluate the data traffic performance of a centralized packet access protocol for microcellular radio systems supporting both speech and data users. A time-slotted radio channel is assumed. Speech contention is decoupled from data contention to give speech priority over data. A free access stack algorithm is used for handling data contention. An out-slot access scheme is used in which the slots are divided into user-information transmission slots and contention slots for sending transmission requests. The contention slots are subdivided in minislots to improve the access capacity. The out-slot algorithm performances are compared with the performances of a previously proposed in-slot one in which all slots can be used for sending user information. A memoryless channel, with capture and errors, is considered. The effects of speech traffic on data performance are evaluated. Moreover, the paper presents a method for evaluating the packet error probability of a packet cellular system. This method is used for evaluating the proposed algorithm in a microcellular system. An access technique with coordinated operation among cochannel cells is studied. The effects of sectorization on data performances and protocol unfairness are investigated. Different frequency reuse factors are taken into consideration
Keywords :
access protocols; frequency allocation; integrated voice/data communication; memoryless systems; microcellular radio; packet radio networks; probability; telecommunication channels; telecommunication traffic; access capacity; centralized packet access protocol; cochannel cells; data contention; data performances; data traffic performance; data users; free access stack algorithms; frequency reuse factors; memoryless channel; microcellular radio systems; minislots; out-slot access scheme; packet cellular system; packet error probability; packet radio networks; protocol unfairness; sectorization; speech contention; speech traffic; time-slotted radio channel; transmission requests; user-information transmission slots; Access protocols; Base stations; Error probability; Frequency; Helium; Memoryless systems; Packet radio networks; Speech analysis; Telecommunication traffic; Wireless communication;
Journal_Title :
Vehicular Technology, IEEE Transactions on
