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EP0475350A2
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An ISDN D channel congestion control method
Assignee: Fujitsu Ltd
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Filing: 1991-09-10
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Granted: —
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Expires: 2011-09-10
Abstract
Abstract An ISDN D channel congestion control method has at least either a digital subscriber line circuit common (DLCC) (7) or a signaling controller (SGC) (18) notify either an SGC (18) or a packet subscriber system (PSS) (23) of a D channel congestion according to a predetermined protocol, thereby controlling the congestion of a communication controlling apparatus.
Inventors
- 👤 Sumie B-203 Town House-Hiyoshi Morita
- 👤 Takashi Hatano
- 👤 Masako Shinmura
- 👤 Hisashi Room 102 Koga
- 👤 Tsutomu 201 Sutouku-Haitsu-Shibata Shiomitsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:29
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
47 words
An ISDN D channel congestion control method, comprising: a step of having at least either a digital subscriber line circuit common (DLCC) or a signaling controller (SGC) notify either an SGC or a packet subscriber system (PSS) of a D channel congestion according to a predetermined protocol.
Claim 2
Dependent Claim
120 words
An ISDN D channel congestion control method for the digital subscriber line circuit common (DLCC) of an ISDN digital switching apparatus, comprising: a step of having a first buffer store D channel P (packet) information concentrated by a signaling controller (SGC); a step of detecting the used capacities of second buffers exceeding a threshold, when said terminals receive said D channel P (packet) information through the corresponding one of said second buffers connected to said terminals; a step of discarding said D channel P (packet) information using capacities of said second buffers exceeding the threshold; and a step of notifying the packet linked controller access (PLCA) of said discarding through a simplified linked layer access procedure D channel (LAPD) protocol.
Claim 3
Dependent Claim
82 words
An ISDN D channel congestion control method for the digital subscriber line circuit common (DLCC) of an ISDN digital switching apparatus, comprising: a step of having a first buffer store D channel S (signaling) information concentrated by a signaling controller (SGC); a step of detecting said S information for respective terminals in excess of a predetermined information volume and resets the link, when said terminals receive said D channel S (signaling) information through the corresponding one of a plurality of second buffers.
Claim 4
Dependent Claim
87 words
An ISDN D channel congestion control method for the digital subscriber line circuit common (DLCC) of an ISDN digital switching apparatus, comprising: a step of performing a congestion control according to the usage rate of a receiving buffer, when said receiving buffer stores D channel P (packet) information concentrated by a signaling controller (SGC); a step of notifying the PLCA in a PSS of a congestion by a simplified LAPD protocol; and a step of regulating said D channel P information by an LAPD in a PLCA.
Claim 5
Dependent Claim
72 words
An ISDN D channel congestion control method for the digital subscriber line circuit common (DLCC) of an ISDN digital switching apparatus, comprising: a step of performing a congestion control according to the usage rate of a receiving buffer for regulating said P information by emitting an RNR (receive not ready) signal to said signaling controller (SGC), when said receiving buffer stores D channel P (packet) information concentrated by a signaling controller (SGC).
Claim 6
Dependent Claim
125 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of monitoring the usage rate of a receiving buffer for receiving P (packet) information supplied from a digital subscriber line circuit common (DLCC); a step of setting sixteen (16) to the service access point (SAP) of a packet subscriber system (PSS) when the usage rate is equal to or greater than a first usage rate threshold; a step of outputting an RNR (receive not ready) signal to a terminal according to a linked layer access procedure D channel (LAPD); and discards said P (packet) information when the usage rate of the receiving buffer is equal to or greater than a second usage rate threshold.
Claim 7
Dependent Claim
54 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of detecting a congestion of S information supplied from the DLCC; and a step of emitting an RNR (receive not ready) signal to said DLCC as a congestion of a line processor (LPR).
Claim 8
Dependent Claim
111 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of monitoring the usage rate of an sending buffer storing P information to be transmitted to the DLCC; a step of performing a primary congestion notification when said usage rate of said sending buffer reaches a first usage rate threshold; a step of regulating the transmission of the I frame having a DLCC shelf number corresponding to the PLCA in a PSS; and a step of performing a secondary congestion notification for discarding said P information, when said usage rate of said sending buffer exceeds a second usage rate threshold.
Claim 9
Dependent Claim
101 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of monitoring the usage rate of the buffer storing the S information to be transmitted to the DLCC; a step of regulating the transmission from an line processor (LPR) through a primary congestion notification, when said usage rate of said buffer is detected to be not less than a first usage rate threshold; and a step of compulsorily releasing said LPR through a secondary congestion notification, when the usage rate is detected to be over the second usage rate threshold.
Claim 10
Dependent Claim
122 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of monitoring the usage rates of respective receiving buffers for concentrating D channel lines; a step of regulating the transmission of all I frames from the corresponding line of a packet linked controller access (PLCA) in a packet subscriber system (PSS) through a primary congestion notification, when one of said usage rates reaches a first usage rate threshold; and a step of having said signaling controller (SGC) discard the information to be stored in one of said receiving buffers through a secondary congestion notification, when the usage rate of said one of said receiving buffers reaches a second usage rate threshold.
Claim 11
Dependent Claim
119 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of monitoring the usage rates of respective sending buffers for concentrating respective D channel lines; a step of notifying of a usage rate in excess of a first usage rate threshold a packet link controller access (PLCA) in a packet subscriber system (PSS), thereby outputting an RNR (receive not ready) signal by the linked layer access procedure D channels (LAPD) of all shelves concentrating said lines; a step of notifying PPR of a usage rate in excess of a second usage rate threshold; and a step of having said signaling controller (SGC) discard the excess D channel information.
Claim 12
Dependent Claim
68 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of monitoring the usage rate of said signaling controller (SGC); a step of outputting an RNR (receive not ready) signal when said usage rate reaches a first usage rate threshold; and a step of reverting to normality when said usage rate reaches a second usage rate threshold.
Claim 13
Dependent Claim
94 words
An ISDN D channel congestion control method for the signaling controller (SGC) of an ISDN digital switching apparatus, comprising: a step of monitoring the usage rates of sending buffers for respective lines in the LAPD of said SGC; a step of outputting a primary congestion notification, and regulating calls destined for line processor (LPR), when any one of said usage rates exceeds a first usage rate threshold; and a step of outputting a secondary congestion notification, and compulsorily releasing said sending buffers, when one of said usage rates exceeds a second usage rate threshold.
References Cited (Backward Citations)
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