EP0481447A2
Expired / Lapsed
EP
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Method of controlling communication network incorporating virtual channels exchange nodes and virtual paths exchange nodes
Assignee: Toshiba Corp
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Filing: 1991-10-16
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Granted: —
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Expires: 2011-10-16
Abstract
Abstract A method of controlling a communication network including VC exchange nodes (4A, 4B) and VP exchange nodes (3A, 5A, 6, 5B, 3B) such that the cell flow of each VP can be maintained within the prescribed characteristic while the end-to-end cell transfer quality for VCs can be estimated easily and accurately. In the network, a cell transfer from the VC exchange nodes to the VP exchange nodes is controlled within prescribed traffic characteristics specified to VPs; a cell transfer quality at each of the VC exchange node is specified in terms of a first cell transfer quality dependent on the control of the cell transfer, and a second cell transfer quality independent on the control of the cell transfer; a cell transfer quality at each of the VP exchange node is specified by a third cell transfer quality independent on the control of the cell transfer alone; an end-to-end cell transfer quality for each VC in the network is estimated in terms of the cell transfer quality of each of the VC exchange nodes and the cell transfer quality of each of the VP exchange nodes; and the bandwidth management in the network is carried out such that the estimated end-to-end cell transfer quality becomes higher than a desired quality of service. <IMAGE>
Inventors
- 👤 Yasuhiro Katsube
- 👤 Toshikazu Kodama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 23:20
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/50; H04L49/501; H04L49/503; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L12/5602; H04L49/20; H04L49/205; H04L49/30; H04L49/3081; H04L2012/5619; H04L2012/5638; H04L2012/5678; H04L2012/568
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
265 words
A method of controlling communication network including virtual channel (VC) exchange nodes and virtual path (VP) exchange nodes, where each of the VC exchange nodes carries out exchange operations in units of VC, each of the VP exchange nodes carries out exchange operations in units of VP, and VPs are provided between the VC exchange nodes through the VP exchange nodes, the method comprising the steps of: (a) controlling a cell transfer from the VC exchange nodes to the VP exchange nodes such that a cell flow of each VP is controlled within prescribed traffic characteristics specified to said each VP; (b) specifying a cell transfer quality at each of the VC exchange node in terms of a first cell transfer quality dependent on a control of the cell transfer at the step (a), and a second cell transfer quality independent on the control of the cell transfer at the step (a); (c) specifying a cell transfer quality at each of the VP exchange node by a third cell transfer quality independent on the control of the cell transfer at the step (a) alone; (d) estimating an end-to-end cell transfer quality for each VC in the communication network in terms of the cell transfer quality of each of the VC exchange nodes specified at the step (b) and the cell transfer quality of each of the VP exchange nodes specified at the step (c); and (e) carrying out a bandwidth management in the communication network such that the end-to-end cell transfer quality estimated at the step (d) becomes higher than a desired quality of service.
Claim 2
Dependent Claim
27 words
The method of claim 1, wherein at the step (a), the control of the cell transfer achieves a VP shaping of the cell flows in the VPs.
Claim 3
Dependent Claim
55 words
The method of claim 2, wherein at the step (a), the VP shaping is achieved by using shaping buffer means for storing cells transmitted from each of the VC exchange node to each of the VP exchange node and transfer control means for controlling an output rate for each VP from the shaping buffer means.
Claim 4
Dependent Claim
24 words
The method of claim 3, wherein at the step (b), the first cell transfer quality is related to operations of the shaping buffer means.
Claim 5
Dependent Claim
25 words
The method of claim 4, wherein at the step (b), the first cell transfer quality is estimated by using traffic characteristics of VCs and VP.
Claim 6
Dependent Claim
27 words
The method of claim 1, wherein at the step (b), the second cell transfer quality is related to a multiplexing of VPs into a physical transmission path.
Claim 7
Dependent Claim
37 words
The method of claim 6, wherein at the step (b), the second cell transfer quality is regarded as a worst possible value predictable by using traffic characteristics of VPs and a capacity of the physical transmission path.
Claim 8
Dependent Claim
27 words
The method of claim 1, wherein at the step (b), the third cell transfer quality is related to a multiplexing of VPs into a physical transmission path.
Claim 9
Dependent Claim
37 words
The method of claim 8, wherein at the step (c), the third cell transfer quality is regarded as a worst possible value predictable by using traffic characteristics of VPs and a capacity of the physical transmission path.
Claim 10
Dependent Claim
257 words
A communication network, comprising: virtual channel (VC) exchange nodes, each of the VC exchange nodes carrying out exchange operations in units of VC; virtual path (VP) exchange nodes, each of the VP exchange nodes carrying out exchange operations in units of VP, where VPs are provided between the VC exchange nodes through the VP exchange nodes; output control means for controlling a cell transfer from the VC exchange nodes to the VP exchange nodes such that a cell flow of each VP is controlled within prescribed traffic characteristics specified to said each VP; and network control means for controlling the cell transfer in the communication network by: specifying a cell transfer quality at each of the VC exchange node in terms of a first cell transfer quality dependent on a control of the cell transfer by the output control means, and a second cell transfer quality independent on the control of the cell transfer by the VC output control means; specifying a cell transfer quality at each of the VP exchange node by a third cell transfer quality independent on the control of the cell transfer by the output control means alone; estimating an end-to-end cell transfer quality for each VC in the communication network in terms of the cell transfer quality of each of the VC exchange nodes and the cell transfer quality of each of the VP exchange nodes; and carrying out a bandwidth management in the communication network such that the estimated end-to-end cell transfer quality becomes higher than a desired quality of service.
Claim 11
Dependent Claim
28 words
The network of claim 10, wherein the output control means control the cell transfer so as to achieve a VP shaping of the cell flows in the VPs.
Claim 12
Dependent Claim
49 words
The network of claim 11, wherein the output control means includes: shaping buffer means for storing cells transmitted from each of the VC exchange node to each of the VP exchange node; and transfer control means for controlling an output rate for each VP from the shaping buffer means.
Claim 13
Dependent Claim
20 words
The network of claim 12, wherein the first cell transfer quality is related to operations of the shaping buffer means.
Claim 14
Dependent Claim
21 words
The network of claim 13, wherein the first cell transfer quality is estimated by using traffic characteristics of VCs and VP.
Claim 15
Dependent Claim
23 words
The network of claim 10, wherein the second cell transfer quality is related to a multiplexing of VPs into a physical transmission path.
Claim 16
Dependent Claim
33 words
The network of claim 15, wherein the second cell transfer quality is regarded as a worst possible value predictable by using traffic characteristics of VPs and a capacity of the physical transmission path.
Claim 17
Dependent Claim
23 words
The network of claim 10, wherein the third cell transfer quality is related to a multiplexing of VPs into a physical transmission path.
Claim 18
Dependent Claim
33 words
The network of claim 17, wherein the third cell transfer quality is regarded as a worst possible value predictable by using traffic characteristics of VPs and a capacity of the physical transmission path.
References Cited (Backward Citations)
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