Multiple-access communication system capable of measuring and guaranteeing a service quality supplied for each service permitted to subscriber stations
First Claim
1. A multiple-access communication system comprising;
- a center station;
a subscriber station;
a broadcasting downstream channel; and
a multiple-access type upstream channel from the subscriber station to the center station, in which the center station permits the subscriber station to use guaranteed services of different qualities and assigns identifiers for each service to the subscriber station, and the subscriber station having an upstream data to send transmits reservation information made up of the identifier and an upstream bandwidth to request in a bandwidth permitted by the center station, and the center station allocates upstream bandwidth to the subscriber based on the reservation information received from the subscriber station, wherein said center station, upon receiving said reservation information from said subscriber station, measures a service quality being supplied with regard to said identifier contained in said reservation information and compares a measured value with a guaranteed value of a previously assigned service quality, and if the measured value is below the guaranteed value, the center station immediately accepts said reservation information and allocates upstream bandwidth, and if the measured value is above the guaranteed value, the center station accepts a reservation information of other subscriber stations prior to accepting said reservation information, so as to prevent degradation of service quality to the other subscriber stations and reassure each quality of service to all said subscribers.
1 Assignment
0 Petitions
Accused Products
Abstract
In a multiple-access communication system where a center station dynamically allocates upstream bandwidth to subscriber stations, upon receiving a reservation information from a subscriber station, the center station obtains an upstream resource usage information of a service corresponding to an identifier added to the reservation information from an upstream resource usage control means. When a value of a guaranteed upstream rate of the service is above a value of measured average upstream rate, an upstream bandwidth is allocated immediately upon receiving the reservation information. On the contrary, when the guaranteed value is below the measured average upstream rate value, the upstream bandwidth allocation to the reservation information is deferred, resulting in preventing degradation of service quality of other subscriber stations.
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Citations
8 Claims
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1. A multiple-access communication system comprising;
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a center station;
a subscriber station;
a broadcasting downstream channel; and
a multiple-access type upstream channel from the subscriber station to the center station, in which the center station permits the subscriber station to use guaranteed services of different qualities and assigns identifiers for each service to the subscriber station, and the subscriber station having an upstream data to send transmits reservation information made up of the identifier and an upstream bandwidth to request in a bandwidth permitted by the center station, and the center station allocates upstream bandwidth to the subscriber based on the reservation information received from the subscriber station, wherein said center station, upon receiving said reservation information from said subscriber station, measures a service quality being supplied with regard to said identifier contained in said reservation information and compares a measured value with a guaranteed value of a previously assigned service quality, and if the measured value is below the guaranteed value, the center station immediately accepts said reservation information and allocates upstream bandwidth, and if the measured value is above the guaranteed value, the center station accepts a reservation information of other subscriber stations prior to accepting said reservation information, so as to prevent degradation of service quality to the other subscriber stations and reassure each quality of service to all said subscribers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification