DocumentCode :
3430723
Title :
Voice over ATM using AAL2 and bit dropping: performance and call admission control
Author :
Sriram, K. ; Wang, Y.T.
Author_Institution :
Lucent Technol., AT&T Bell Labs., Holmdel, NJ, USA
fYear :
1998
fDate :
26-29 May 1998
Firstpage :
215
Lastpage :
224
Abstract :
We consider an asynchronous transfer mode (ATM) adaptation layer 2 (AAL2) system similar to that described by Baldwin, Bharucha, Doshi, Dravida and Nanda (see Bell Labs Technical Journal, vol.2, no.2, p.111-31, 1997), but with the additional possibility of selectively dropping the less significant bits of voice packets during periods of congestion. Dropping less significant bits of voice for relieving congestion depends on the ability of the transport protocol to handle variable length packets, and is currently used in frame-relay networks. Because of the fixed ATM cell size, bit dropping on voice was not viable in ATM networks prior to the development of the AAL2 protocol. By allowing variable length packets within the ATM cell payload, the AAL2 protocol makes it possible to use bit dropping. AAL2 also makes it possible to take advantage of voice silence periods. We show that the combination of silence elimination and bit dropping enables high overall statistical multiplexing gain, and makes voice transmission over ATM bandwidth very efficient and economical
Keywords :
asynchronous transfer mode; packet switching; telecommunication congestion control; telecommunication traffic; transport protocols; voice communication; 32 kbit/s; AAL2 protocol; ADPCM coding; ATM WAN; adaptation layer 2; asynchronous transfer mode; bandwidth; bit dropping; call admission control; congestion control; fixed ATM cell size; frame-relay networks; less significant bits; performance; statistical multiplexing gain; transport protocol; variable length packets; voice over ATM; voice packet dropping; voice silence periods; voice transmission; wireless network; Analytical models; Asynchronous transfer mode; Bandwidth; Bit rate; Call admission control; Delay; Multiplexing; Protocols; Queueing analysis; Traffic control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
ATM Workshop Proceedings, 1998 IEEE
Conference_Location :
Fairfax, VA
ISSN :
1098-7789
Print_ISBN :
0-7803-4874-5
Type :
conf
DOI :
10.1109/ATM.1998.675177
Filename :
675177
Link To Document :
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