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Call admission control system for wireless ATM networks
| Details |
Inventors: Ngo, Chiu Y.; Hettich, Andreas;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Vu; Huy D.
Assistant Examiner: Nguyen; Steven
Attorney, Agent or Firm: Piotrowski; Daniel J.
A system which determines whether to accept a wireless connection to a network device receives a request to initiate the wireless connection to the network device, and then determines, in response to the request, a nominal cell rate at which cells are exiting from a buffer in the network device for the requested wireless connection. Thereafter, the system determines an amount of buffer space in the network device required to accommodate the connection, and decides whether to accept the wireless connection based on the nominal cell rate and the amount of buffer space required to accommodate the connection. |
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DETAILED DESCRIPTION The present invention addresses the foregoing needs by providing a call admission control protocol, for use in a network base station or the like, which determines whether the base station should accept connection to a network device based on an amount of buffer space required to accommodate the connection and on a nominal cell rate at which cells are output from the buffer for the requested connection.
By determining whether to accept connection based on these factors, the present invention increases the efficiency and the speed of communications protocols with which it is used.
According to one aspect, the present invention is a system (e.
g.
, a method or computer-executable process steps) which operates in an ATM layer of a base station and which determines whether the base station should accept or deny a wireless connection to a network device.
In operation, the base station receives a request to initiate the wireless connection to the network device, and the base station determines, in response to the request, a nominal cell rate at which cells are exiting from a buffer in the network device for the requested wireless connection.
Thereafter, the base station determines an amount of buffer space in the network device required to accommodate the connection, and decides whether it should accept or deny the wireless connection based on the nominal cell rate and the amount of buffer space required to accommodate the connection.
In preferred embodiments of the invention, the request to initiate the wireless connection is made to the base station by a network device using a traffic descriptor for a real-time variable bit rate ("rt-VBR") connection.
However, it is noted that the invention is not limited to use with rt-VBR traffic, and that the invention can be used with any one or more types of ATM traffic.
In other preferred embodiments of the invention, when the base station denies the wireless connection, it determines an amount of buffer space which is available in the buffer, and then varies the nominal cell rate based on the amount of available buffer space so as to accommodate the request
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