Bảo đảm tính phí dịch vụ Trong Phần , chúng tôi xác định một dịch vụ được đảm bảo như một cho đó có là hợp đồng giữa các nhà cung cấp dịch vụ và khách hàng. Hợp đồng này quy định các nghĩa vụ cho cả hai bên. Các nhà cung cấp dịch vụ thỏa thuận cung cấp một dịch vụ với các thông số chất lượng nhất định, miễn là lưu lượng truy cập của khách hàng đáp ứng hạn chế nhất định. Nói chung, một hợp đồng cho một dịch vụ đảm bảo có thể cho phép một. | Pricing Communication Networks Economics Technology and Modelling. Costas Courcoubetis and Richard Weber Copyright 2003 John Wiley Sons Ltd. ISBN 0-470-85130-9 8 Charging Guaranteed Services In Section we defined a guaranteed service as one for which there is a contract between the service provider and the customer. This contract specifies obligations for both parties. The service provider agrees to provide a service with certain quality parameters so long as the customer s traffic satisfies certain constraints. In general a contract for a guaranteed service may allow some flexibility. Certain contract parameters such as maximum peak rate may be renegotiated and allowed to change their values during the life of the service. For example the contact might specify that the network guarantees no information loss so long as the user sends at no more than a maximum rate of h Mbps. The value of h may be renegotiated at the beginning of every minute to be some value between 1 and 2. Thus there is a part of the contract which guarantees no cell loss at a rate of 1. Any extra rate above this must be negotiated. One possibility is that the extra rate must be bought in a bandwidth auction. This auction is run by the network operator so as to better utilize spare capacity. A second possibility is that the operator posts a price and lets the user choose how much bandwidth in excess of 1 he wishes to buy. He sets to reflect the present level of congestion in the network. Seeing the user must choose the amount of bandwidth in excess of 1 he would like. Chapter 10 is about charging flexible contracts and pricing methodology that gives users incentives to make such choices optimally. However in this chapter we restrict attention to guaranteed services whose contracts do not allow the users such flexibility. We suppose that all contract parameters are statically defined at the time the contract is established. Equivalently we restrict attention to that portion of .
