โ Scribed by Takehiro Kawata; Hiroshi Yamada; Makoto Horiguchi; Hideyo Murakami
No coin nor oath required. For personal study only.
The rapid growth of computer-communication services means that telephone-conversation traffic must compete for system resources with computer-communication traffic carried by dial-up connections to the Internet or intranets over public telephone switching networks. The traffic characteristics differ for the two types of service; for example, the mean holding time and peak traffic periods are different. However, because dial-up connection calls occupy circuit lines for a long time, the grade of service (GoS) of telephone-conversation calls may deteriorate during periods of peak demand.
Another problem is that since a telephone switching network is dimensioned to satisfy the required GoS for telephone calls during peak demand periods, there will be surplus resources, and a significant opportunity cost, during off-peak periods. One way to efficiently use these surplus switching-network resources is to offer fixed-cost best-effort dial-up connection service during off-peak periods for telephone traffic. This also makes the demand for dial-up connections less likely to affect the GoS of telephoneconversation calls during peak periods. We propose a priority control scheme for such an off-peak service.
This scheme works as follows in a telephone switching system where both high-priority telephone-conversation calls and low-priority dial-up connection calls are offered. When a call arrives at the system and there are adequate resources available for an ordinary telephoneconversation call, a high-priority telephone call or a lowpriority dial-up connection call can be connected. However, if a high-priority call arrives at the system and there are not enough resources available to allow connection, an already connected dial-up connection call is forcibly cut off to
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