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Facility for assigning transmission channels to terminals of a service-on-demand system
| Details |
Inventors: Cesar, Bozo; Keil, Klaus; Riemer, Joachim;
Assignee: Alcatel (Paris, FR)
Primary Examiner: Miller; John
Assistant Examiner: Shang; Annan
Attorney, Agent or Firm: Ware, Fressola, Van Der Sluys & Adolphson
A service-on-demand system (SYS) includes a facility (EIN) which is designed to assign transmission channels to terminals (END1, END2). To accomplish this, the facility (EIN) contains two interfaces (S1, S2) for connecting it to two groups of terminals (END1, END2), a memory (MEMO) which holds an assignment table containing entries on currently available and currently busy transmission channels for transmitting services requested from terminals (END1, END2), with a variable assignment of transmission channels to terminals (END1, END2) being possible regardless of which group the terminals (END1, END2) belong to, and a control unit (CTRL) which coordinates the assignment. Only those transmission channels can be assigned which are considered currently available in the memory (MEMO). The transmission channels are not permanently assigned to groups but are largely freely available to all terminals (END1, END2). For example, a minimum number of freely available transmission channels may be reserved for each group, and the remaining channels may be used both by terminals of group 1 and by terminals of group 2, etc., depending on traffic volume and demand. This provides flexibility and adapts the assignment of transmission channels automatically to the traffic volume. |
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DETAILED DESCRIPTION It is therefore an object of the invention to organize the assignment of transmission channels to terminals of a service-on-demand system in such a manner that the above disadvantages are avoided.
According to the invention, this object is attained by a facility for assigning transmission channels to terminals of a service-on-demand system, wherein at least two interfaces are provided for connecting the facility to a plurality of terminals, each of the interfaces being connected to a group of terminals by a separate line, that a memory is provided which holds an assignment table containing entries on currently available and currently busy transmission channels for transmitting services requested from terminals, with a variable assignment of transmission channels to terminals being possible regardless of which group the terminals belong to, that a control unit is provided which is connected to the interfaces and the memory, and that the control unit is adapted to receive connection requests from individual terminals for requesting services, to assign at least one transmission channel to each of the individual terminals in response thereto and store the assignment in the memory if in the memory the at least one transmission channel is considered currently available, and to notify the individual terminals that the establishment of a connection is not possible for the time being if in the memory all transmission channels are considered busy.
The facility is characterized in that it provides for a variable assignment of transmission channels to terminals, regardless of which group the terminals belong to.
For 64+64=128 terminals connected to two BONTs in two groups, for example, 64 transmission channels are provided.
The transmission channels are not permanently assigned to the two groups, but are largely freely available to all terminals.
For instance, channel 1 may be occupied by terminal 1 of group 1, and channel 2 by terminal 25 of group 2.
To be able to reserve a minimum number of freely available transmission channels for each group, 16 of the 64 channels, for example, are reserved as a minimum number for group 1 and another 16 of the 64 channels are reserved as a minimum number for group 2
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