EP0272939A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dynamic buffer supervising system for a data link access protocol control
Assignee: Oki Electric Industry Co Ltd
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Filing: 1987-12-23
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Granted: —
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Expires: 2007-12-23
Abstract
Abstract In a communication apparatus of the type performing ISDN LAPD signal processing, the assignment of buffers each for temporarily storing a received data signal is supervised. Idle buffers are reserved in a common idle buffer pool while transmit buffers and receive buffers are supervised for each of service access points. The number of buffers awaiting processing or transmission is monitored at each predetermined period, on the identifier basis. As the number of idle buffers reserved in the idle buffer pool decreases to less than a predetermined value, the idle buffer assignment allowable for processing is restricted in number on the service access point basis and in matching relation to a function of the current number of waiting buffers and a predetermined threshold value. The restriction may be provided with a plurality of different levels, in which case a restriction level border value for a transition in a restriction tightening direction is selected to be smaller than that for a transition in a restriction relaxing direction with respect to the number of idle buffers. The number of idle buffers and the restriction level border value may be defined per unit time each.
Inventors
- 👤 Tamiya Nakamura
- 👤 Toru Furuhashi
- 👤 Kuniaki Kishino
- 👤 Hiroshi Bamba
- 👤 Takaaki Ozeki
- 👤 Toshihiko Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 08:37
CPC Classifications
H; H04; H04L; H04L12/00; H04L47/00; H04L47/10; H04L47/30; H04L47/29; H04L47/50; H04L47/62; H04L47/6215; H04L49/00; H04L49/90; H04L49/901; H04L49/9047; H04L49/9057; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
198 words
A system for supervising assignment of buffers for individually temporarily storing data signals which a communication apparatus of a type performing data link access protocol signal processing transmits and receives, comprising: buffer assigning means (16) for assigning receive buffers, which individually temporarily store received data signal and characterised by supervising means for supervising the number of buffers to be assigned by said buffer assigning means by counting the number of buffers per unit period of time which are idle; at least one counter means for counting the number of buffers per unit period of time which are used to store received data signals; restriction value setting means provided in association with said at least one counter means for storing a restriction value in terms of the number of buffers per unti period of time; and means provided in association with said restriction value setting means for comparing a count made by said associated counter means with the restriction value stored in said restriction value setting means and, when said count corresponds with said restriction value, producing a first signal; said buffer assigning means inhibiting assignment of idle buffers to receive data signal in response to said first signal.
Claim 2
Independent Claim
198 words
A system for supervising assignment of buffers for individually temporarily storing data signals which a communication apparatus of a type performing data link access protocol signal processing transmits and receives, comprising: buffer assigning means (16) for assigning receive buffers, which individually temporarily store received data signal and characterised by supervising means for supervising the number of buffers to be assigned by said buffer assigning means by counting the number of buffers per unit period of time which are idle; at least one counter means for counting the number of buffers per unit period of time which are used to store received data signals; restriction value setting means provided in association with said at least one counter means for storing a restriction value in terms of the number of buffers per unti period of time; and means provided in association with said restriction value setting means for comparing a count made by said associated counter means with the restriction value stored in said restriction value setting means and, when said count corresponds with said restriction value, producing a first signal; said buffer assigning means inhibiting assignment of idle buffers to receive data signal in response to said first signal.
Claim 3
Independent Claim
292 words
A system for supervising assignment of buffers for individually temporarily storing data signals which are transmitted to and received from a communication apparatus of a type performing D channel data link access protocol signal processing as defined by CCITT Recommendations pertaining to a user-network interface of an integrated service digital network, said system comprising: processing means for processing the data signals each of which is temporarily stored in respective one of the buffers; first buffer assigning means for assigning receive buffers, which individually temporarily store received data signals which wait until processed by said processing means, to said received data signals for each of service access points; second buffer assigning means for assigning transmit buffers, which individually temporarily store data signals which have been processed by said processing means and wait until transmitted, to said processed data signals for each of the service access points; idle buffer reserving means shared by said first and second buffer assigning means for reserving idle buffers therein; and supervising means for supervising the number of buffers to be assigned by said first buffer assigning means and the number of buffers to be assigned by said second buffer assigning means depending upon the number of idle buffers which are reserved by said idle buffer reserving means; said processing means monitoring numbers of waiting buffers at each predetermined period and for each of the service access points and, when said supervising means has detected that the number of idle buffers reserved by said idle buffer reserving means has decreased to less than a predetermined value, controlling assigned numbers of idle buffers which are to be accepted on a service access point basis, depending upon a function of a current number of waiting buffers and a predetermined threshold value.
Claim 4
Independent Claim
292 words
A system for supervising assignment of buffers for individually temporarily storing data signals which are transmitted to and received from a communication apparatus of a type performing D channel data link access protocol signal processing as defined by CCITT Recommendations pertaining to a user-network interface of an integrated service digital network, said system comprising: processing means for processing the data signals each of which is temporarily stored in respective one of the buffers; first buffer assigning means for assigning receive buffers, which individually temporarily store received data signals which wait until processed by said processing means, to said received data signals for each of service access points; second buffer assigning means for assigning transmit buffers, which individually temporarily store data signals which have been processed by said processing means and wait until transmitted, to said processed data signals for each of the service access points; idle buffer reserving means shared by said first and second buffer assigning means for reserving idle buffers therein; and supervising means for supervising the number of buffers to be assigned by said first buffer assigning means and the number of buffers to be assigned by said second buffer assigning means depending upon the number of idle buffers which are reserved by said idle buffer reserving means; said processing means monitoring numbers of waiting buffers at each predetermined period and for each of the service access points and, when said supervising means has detected that the number of idle buffers reserved by said idle buffer reserving means has decreased to less than a predetermined value, controlling assigned numbers of idle buffers which are to be accepted on a service access point basis, depending upon a function of a current number of waiting buffers and a predetermined threshold value.
Claim 5
Dependent Claim
123 words
A system in accordance with claim 2, wherein when said supervising means has detected that the number of idle buffers reserved in said idle buffer reserving means has decreased to less than said first predetermined value, said processing means produces a difference between the current number of waiting buffers and the predetermined threshold value for each of the service access points and, then, compares resulting differences to each other; said supervising means, in response to a result of the comparison performed by said processing means, reducing to an additional predetermined value the number of idle buffers to be assigned to data signals which are received in relation to one of the service access points the difference of which is smaller than the others.
Claim 6
Dependent Claim
112 words
A system in accordance with claim 2, wherein said supervising means counts the number of idle buffers which are associated with said first buffer assigning means; said system further comprising reception restricting means which is provided with a plurality of levels of restriction value, said reception restricting means comparing the number of idle buffers counted by said supervising means to said plurality of levels of restriction value for each of the service access points and, then, restricting the number of receive buffers available for reception of data signals from said service access point to a second predetermined value of the plurality of levels which is associated with a result of the comparison.
Claim 7
Dependent Claim
52 words
A system in accordance with claim 4, wherein the value of the plurality of levels is smaller for a transition from a relaxed restriction level to a tightened restriction level than for a transition from the tightened restriction level to the relaxed restriction level with respect to the number of idle buffers.
Claim 8
Dependent Claim
48 words
A system in accordance with claim 4, wherein said supervising means counts the number of idle buffers per unit period of time; in said reception restriction means, the values of the plurality of levels being defined in terms of the number of buffers per unit period of time.
Claim 9
Dependent Claim
102 words
A system in accordance with claim 2, wherein said supervising means counts the number of idle buffers which are associated with said first buffer assigning means; said system further comprising reception restricting means which is provided with a restriction value, said reception restricting means comparing the number of idle buffers counted by said supervising means with said restriction value for each of the service access points and, when said number of idle buffers has become smaller than said restriction value, restricting the number of receive buffers available for reception of data signals from said service access point to a second predetermined value.
Claim 10
Dependent Claim
44 words
A system in accordance with claim 7, wherein said supervising means counts the number of idle buffers per unit period of time; in said reception restricting means, the restriction value being defined in terms of the number of buffers per unit period of time.
Claim 11
Dependent Claim
149 words
A system in accordance with claim 8, wherein said reception restricting means comprises: at least one counter means provided in association with the service access point for counting the number of buffers per unit period of time used for storing data signals which are received in relation to said service access point; restriction value setting means provided in association with said at least one counter means for storing the restriction value in terms of the number of buffers per unit period of time, and comparator means provided in association with said restriction value setting means for comparing the number output by said associated counter means with the restriction value stored in said restriction value setting means and, when said number has reached said restriction value, producing a first signal; said first buffer assigning means, in response to said first signal, inhibiting assignment of idle buffers to received data signals.
Claim 12
Dependent Claim
44 words
A system in accordance with claim 9, wherein in response to the first signal said first buffer assigning means inhibits assignment of idle buffers to data signals which are received in relation to the service access point which is associated with said first signal.
Claim 13
Dependent Claim
16 words
A system in accordance with claim 2, wherein the service access points include a circuit-switching-service-oriented terminal.
Claim 14
Dependent Claim
16 words
A system in accordance with claim 2, wherein the service access points include a packet-switching-service-oriented terminal.
Claim 15
Independent Claim
229 words
A system for supervising assignment of buffers for individually temporarily storing for a processing purpose data signals which a communication apparatus of a type performing data link access protocol signal processing transmits and receives, comprising buffer assigning means for assigning receive buffers, which individually temporarily store received data signals which wait until fed for processing, to said received data signals for each of service access points.; vbuffer reserving means for reserving idle buffers; supervising means for supervising the number of buffers to be assigned by said buffer assigning means by counting a number of buffers per unit period of time which are reserved in said buffer reserving means; and reception restricting means provided with a plurality of levels of restriction value, said reception restricting means comparing the number of idle buffers counted by said supervising means with the plurality of levels of restriction value for each of the service access points and, then, restricting the number of receive buffers, which individually receive data signals from said service access point, to a second predetermined value which is associated with a result of said comparison; said plurality of different levels of restriction value which are smaller for a transition from a relaxed restriction level to a tightened restriction level than for a transition from said tightened restriction level to said relaxed restriction level with respect to the number of idle buffers.
Claim 16
Independent Claim
229 words
A system for supervising assignment of buffers for individually temporarily storing for a processing purpose data signals which a communication apparatus of a type performing data link access protocol signal processing transmits and receives, comprising buffer assigning means for assigning receive buffers, which individually temporarily store received data signals which wait until fed for processing, to said received data signals for each of service access points.; vbuffer reserving means for reserving idle buffers; supervising means for supervising the number of buffers to be assigned by said buffer assigning means by counting a number of buffers per unit period of time which are reserved in said buffer reserving means; and reception restricting means provided with a plurality of levels of restriction value, said reception restricting means comparing the number of idle buffers counted by said supervising means with the plurality of levels of restriction value for each of the service access points and, then, restricting the number of receive buffers, which individually receive data signals from said service access point, to a second predetermined value which is associated with a result of said comparison; said plurality of different levels of restriction value which are smaller for a transition from a relaxed restriction level to a tightened restriction level than for a transition from said tightened restriction level to said relaxed restriction level with respect to the number of idle buffers.
References Cited (Backward Citations)
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