EP0631704A4 - Dispositif et procede d'ajustement adaptatif de la capacite de charge d'un noeuddans un systeme de communication par paquets. - Google Patents

Dispositif et procede d'ajustement adaptatif de la capacite de charge d'un noeuddans un systeme de communication par paquets.

Info

Publication number
EP0631704A4
EP0631704A4 EP94902290A EP94902290A EP0631704A4 EP 0631704 A4 EP0631704 A4 EP 0631704A4 EP 94902290 A EP94902290 A EP 94902290A EP 94902290 A EP94902290 A EP 94902290A EP 0631704 A4 EP0631704 A4 EP 0631704A4
Authority
EP
European Patent Office
Prior art keywords
rdr
data traffic
atdr
node
rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94902290A
Other languages
German (de)
English (en)
Other versions
EP0631704A1 (fr
Inventor
Jeff Pfeil
David Philip Bush
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of EP0631704A1 publication Critical patent/EP0631704A1/fr
Publication of EP0631704A4 publication Critical patent/EP0631704A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L12/5602—Bandwidth control in ATM Networks, e.g. leaky bucket
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H04L47/263—Rate modification at the source after receiving feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5614—User Network Interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5632—Bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5632—Bandwidth allocation
    • H04L2012/5635—Backpressure, e.g. for ABR
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5636—Monitoring or policing, e.g. compliance with allocated rate, corrective actions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671—Support of voice
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
    • H04L2012/5681—Buffer or queue management
    • H04L2012/5682—Threshold; Watermark
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention relates generally to capacity in a communication system. More particularly, the present invention relates to a device and method for adjusting loading capacity in a packet-based communication system.
  • Communication resources such as radio frequency channels have a limited capacity. Nevertheless, communication needs have continued to increase. More users are continually being added to communication systems. The efficiency and reliability of a communication system is closely related to its system capacity. System capacity is generally based on the number of available channels and the throughput rate associated therewith. Without technical improvements that provide for loading capacity adjustment, users may face impaired service, or ultimately, a complete lack of available service.
  • Trunked communication systems such as telephone and cellular systems typically include an inherent fixed upper threshold for system capacity, in a digital communication system, this upper threshold is an upper limit that is based on the number of available channels and the throughput rate. When the upper limit of the system's capacity is reached, the system is unable to carry data traffic (i.e., call blocking occurs). For a fixed bandwidth digital communication system, typically maximum throughput is limited to a predetermined upper limit that is allowed for a channel. In addition, for a voice channel, if more throughput is allocated to digital representation of voice on the channel, fewer channels can be simultaneously utilized. As traffic on the system increases to a level that approaches the fixed upper limit of the system's capacity, if no flexibility is provided for adjusting the traffic-carrying capacity of the system, call blocking is highly likely to occur.
  • An adaptive loading capacity device for a node and a method for adaptively adjusting a loading capacity for a node are set forth.
  • the device automatically adjusts a data rate of a vocoder for the node in a packet-based linked communication system.
  • the device includes a data traffic-determining unit, operably coupled to receive data traffic, for determining whether a current data rate (CDR) of the data traffic within the node exceeds a predetermined threshold and, where the CDR exceeds the predetermined threshold, for determining an adjusted throughput data rate (ATDR) for communication links/station (s) utilizing the system in accordance with a predetermined strategy such that further links/station(s) may utilize the system.
  • the data traffic includes frames that include packetized information for coded speech data traffic.
  • Frames also include a requested data rate (RDR) and a current data rate (CDR) for the coded speech data traffic.
  • the device further includes an automatic adjusting unit operably coupled to the data traffic-determining unit for, upon comparing the RDR with the ATDR and determining that the RDR is greater than the ATDR, automatically adjusting the RDR downward to equal the ATDR. In this manner system capacity is increased, and a probability of call-blocking is reduced in the system.
  • the method implements the functions of the device as described above.
  • FIG. 1 is a block diagram of a first embodiment of an adaptive loading capacity device in accordance with the present invention.
  • FIG. 2 illustrates a frame format for basic information contained within a frame in the system in accordance with the present invention.
  • FIG. 3 is a block diagram of an adaptive loading capacity device for a node together with a plurality of stations in a packet-based communication system in accordance with the present invention.
  • FIG. 4 is a block diagram showing a station of FIG. 3 with greater particularity.
  • FIG. 5 is a block diagram of a communication system utilizing an adaptive capacity loading device in accordance with the present invention.
  • FIG. 6 is a flow chart setting forth a first embodiment of steps in accordance with the method of the present invention.
  • FIG. 7 is a flow chart illustrating the step of automatically adjusting the RDR downward to equal the ATDR of FIG. 6 is shown with more particularity.
  • FIG. 8 is a flow chart setting forth a second embodiment of steps of the method of the present invention.
  • FIG. 9 is a block diagram of a microprocessor constructed and arranged (programmed) to provide the adaptive loading capacity device of the present invention.
  • the present invention provides an device and method that readily identifies a coded speech data rate loading problem at a node in a communication system where the loading may lead to call blocking due to filling of the system capacity. Then, the present invention automatically reduces the coded speech data rate, thereby reducing the data rates available for additional calls that may be added to the system. This action allows subsequent calls to be placed without call blocking, allowing more calls at a reduced voice quality during periods of heavy traffic.
  • FIG. 1 is a block diagram of a first embodiment of an adaptive loading capacity device in accordance with the present invention.
  • the adaptive loading capacity device (102) automatically adjusts a data rate of a vocoder for a node in a packet-based linked communication system.
  • the device includes a data traffic-determining unit (104) and an automatic adjusting unit (106).
  • the data traffic-determining unit (104) of the node is operably coupled to receive data traffic of the communication system, generally from multiple nodes and, where selected, at least one of a plurality of stations.
  • a station is an input/output point of the communication system, i.e., generally a single addressable site on a LAN that is typically implemented as a computer and selected peripherals.
  • the data traffic-determining unit (104) determines a current data rate (CDR) of data traffic within the node and determines whether the CDR exceeds a predetermined threshold.
  • the predetermined threshold is an upper rate limit for the system.
  • the data traffic-determining unit (104) determines an adjusted throughput data rate (ATDR) for communication links/station(s) utilizing the system in accordance with a predetermined strategy.
  • the strategy is to provide an adjusted rate that is lower than the current rate, thereby allowing the node to throughput data traffic for a greater number of calls.
  • the ATDR typically represents an upper rate limit or capacity of the system or, alternatively, an upper rate limit decremented by a buffer value. The buffer value prevents a slight increase in data rate from filling the capacity of the system, causing call-blocking.
  • Data traffic is packetized into frames that include a requested data rate (RDR).
  • RDR requested data rate
  • the strategy implemented includes comparing the magnitudes of the RDR and the ATDR and reducing the RDR to the ATDR.
  • the device automatically adjusts the RDR downward to substantially equal .the ATDR.
  • the adjusted RDR is incorporated into frames that are transmitted to coupled nodes and stations, which then automatically adjust the CDR to substantially equal the requested RDR.
  • the reduction of the CDR allows further links/station(s) to utilize the system.
  • the data traffic comprises frames that include packetized information for coded speech data traffic (208).
  • the frames further include a requested data rate (RDR) (204) and a current data rate (CDR) (206) for the coded speech data traffic.
  • each frame typically includes a frame descriptor (202).
  • the coded speech data traffic comprises packets of digitized code that represent speech information from calls made by communication system users.
  • the automatic adjusting unit (106) is operably coupled to the data traffic-determining unit (104).
  • the automatic adjusting unit (106) compares the RDR of each frame with the ATDR received from the data traffic-determining unit (104) and determines whether the RDR is greater than the ATDR.
  • the automatic adjusting unit (106) automatically adjusts the RDR downward to equal the ATDR. Where the RDR is less than or equal to the ATDR, the automatic adjusting unit (106) typically maintains the current RDR. Where the RDR is adjusted to a lower rate
  • the ATDR is less than the RDR
  • the probability of call- blocking is reduced since a portion of the capacity of the system becomes available for additional calls.
  • the adjusted RDR is incorporated into frames that are transmitted to coupled nodes and stations, which then automatically adjust the CDR to substantially equal the requested RDR.
  • the loss is typically acceptable and call- blocking is reduced.
  • FIG. 3 is a block diagram of an adaptive loading capacity device of a node where a plurality of nodes function together with a plurality of stations in a packet- based communication system in accordance with the present invention.
  • FIG. 4 is a block diagram showing a station of FIG. 3 with greater particularity.
  • the adaptive loading capacity device (102) as described more fully above, is coupled to transmit and receive packetized coded speech data traffic from a plurality of nodes (314, 316, 318, ...) and stations (302, 308, ).
  • Each station includes a receiving- adjusting unit (304, 310, ...), operably coupled to a at least a first node for, upon receiving a frame of packets of coded speech data traffic from the node (102, 3), sending a received RDR of the frame to an encoding-initializing unit (406) of the station and decoding the packets at a rate defined by the CDR of the frame.
  • Each station also includes a transmitting- adjusting unit (306, 312, ...) that is operably coupled to the node (102, ...) for receiving digitized speech data, encoding said data into packets and transmitting the encoded speech packets at the RDR that has been adjusted to be substantially equivalent to the received RDR.
  • each of the nodes is located in a separate orbiting satellite of a plurality of satellites
  • a station receives frames of packets from, and transmits frames of packets to, a satellite that is predetermined with respect to its orbital position. That is, generally a station will receive/transmit at least from/to the orbiting satellite that is in greatest proximity to the station. Also, it is clear that, with respect to system capacity, where the station detects a highly loaded node, as predetermined, the station may further make an adjustment to receive/transmit from/to another node.
  • the transmitting-adjusting unit (306, 312, ...) typically includes an encoding-initializing unit (402), a data rate setting unit (404), and a transmitting unit (406).
  • the encoding-initializing unit (402) operably coupled to receive digitized speech input and to the receiving-adjusting unit (304), encodes and packetizes the digitized speech packets utilizing the CDR and initializes an RDR of frames to be equivalent to the received RDR.
  • the data rate setting unit (404) is operably coupled to the encoding-initializing unit (402) and is utilized for setting the CDR of the frame to the requested RDR for the station and inserting the CDR and RDR into the frames.
  • the transmitting unit (406) is operably coupled to the data rate setting unit (404), for transmitting the frames to a preselected node.
  • FIG. 5, numeral 500 is a block diagram of a communication system utilizing a first embodiment of an adaptive capacity loading device in accordance with the present invention.
  • a plurality of nodes node 1 , node 2, node 3, ...) are operably coupled, as preselected, and a plurality of stations (Station 1 , 516; Station 2, 518; Station 3, 520; Station 4, 522, ...) are operably coupled to at least one of the nodes such that each station has a communication path with other stations in the system.
  • each of the nodes (504, 506, 508, ...) includes an adaptive capacity loading device (ACDL) (510, 512, 514, ...) that operates as described above.
  • ACDL adaptive capacity loading device
  • a system may be arranged so that only nodes that are more likely to experience high traffic rates include the device of the present invention.
  • ATDR adjusted throughput data rate
  • the couplings of the communication system may accommodate frames/packets of data traveling in both directions.
  • the frames may carry data packets and acknowledgement packets for many different calls or virtual circuits.
  • each line may be considered as constituting many different paths for accommodating many different calls from many different stations.
  • FIG. 6, numeral 600 is a flow chart setting forth a first embodiment of the steps in accordance with the method of the present invention.
  • the method of the invention provides for automatically adjusting a data rate of data traffic of a vocoder for a node in a packet-based linked communication system, where the data traffic comprises packets that include at least information for coded speech data traffic and frames that include a requested data rate (RDR) and a current data rate (CDR) for the coded speech data traffic.
  • RDR requested data rate
  • CDR current data rate
  • the method shown in FIG. 6 includes the step of first determining whether a current data rate (CDR) of the data traffic within the node exceeds a predetermined threshold (602) and, where the CDR exceeds the predetermined threshold, determining an adjusted throughput data rate (ATDR) (604) for links/station (s) utilizing the system in accordance with a predetermined strategy such that the system may accommodate traffic for further calls.
  • the predetermined strategy includes provision of an adjusted rate to a node where the adjusted rate is lower than the current rate, thereby allowing the node to throughput data traffic for a greater number of calls.
  • An RDR of each received frame is compared with the ATDR. Where the received RDR is greater than the ATDR, the RDR is automatically adjusted downward to be substantially equal to the ATDR.
  • the step of automatically adjusting the RDR downward to equal the ATDR includes reducing the RDR to an ATDR that is equivalent to one of: a predetermined upper limit of the system's capacity (702) and the predetermined upper limit of the system's capacity minus a predetermined buffer value (704).
  • the adjusted RDR is incorporated into frames that are transmitted to coupled nodes and stations, which then automatically adjust the CDR of received frames to substantially equal the requested RDR. In this manner, a probability of call-blocking is reduced in the system.
  • FIG. 8, numeral 800 is a flow chart setting forth a second embodiment of the steps of the method of the present invention.
  • the method further includes implementation of the following steps by the stations: (1 ) upon receiving a frame of coded speech data traffic from a node, sending a received RDR of the frame to an encoding-initializing unit of the transmitting-adjusting unit of the station and also decoding packets of the frame at the CDR (802), and (2) transmitting an encoded speech frame (804) by (A) encoding and packetizing the digitized speech data utilizing the CRC and initializing the RDR of the frame to be substantially equivalent to the received RDR (806); (B) setting the CDR to the received RDR and inserting the CDR and the received RDR into the frame (808); and (C) transmitting the frame to a preselected node (810).
  • FIGs. 6-8 which clearly implement the functions of the hardware, in a computer program.
  • FIG. 9, numeral 900 is a block diagram of a microprocessor constructed and arranged (programmed) to provide the adaptive loading capacity device of the present invention.
  • the microprocessor (902) is programmed to provide at least the functions of the data traffic-determining unit (104) and the automatic adjusting unit (106), as described above.
  • the device further includes, associated memory circuitry (904), and associated circuitry for coupling the microprocessor to the node(s) (906) and to receive data traffic from the stations/nodes (908,).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Le flux de paquets de paroles codées numérisées acheminées par les circuits virtuels d'un système (300) de communication multinodal est régulé par un dispositif à capacité de charge adaptative (102) dans les n÷uds (314, 316, 318). Ce dispositif à capacité de charge adaptative (102) détermine un rythme de données à débit ajusté (ATDR) (602, 604) pour un n÷ud donné (314, 316, 318) qui est essentiellement équivalent à la limite supérieure prédéterminée de la capacité du système. Lorsque la valeur demandée de rythme d'acheminement de données (RDR) incluse dans le bloc (200) est supérieure à l'ATDR, le dispositif ajuste automatiquement ce RDR en le ramenant à une valeur sensiblement égale à l'ATDR (702, 704) et inclut la RDR ajustée dans les blocs (200) transmis aux n÷uds couplés (314, 316, 318) et aux stations (302, 308).
EP94902290A 1992-12-17 1993-11-18 Dispositif et procede d'ajustement adaptatif de la capacite de charge d'un noeuddans un systeme de communication par paquets. Withdrawn EP0631704A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US99223992A 1992-12-17 1992-12-17
US992239 1992-12-17
PCT/US1993/011188 WO1994014256A1 (fr) 1992-12-17 1993-11-18 Dispositif et procede d'ajustement adaptatif de la capacite de charge d'un n×ud dans un systeme de communication par paquets

Publications (2)

Publication Number Publication Date
EP0631704A1 EP0631704A1 (fr) 1995-01-04
EP0631704A4 true EP0631704A4 (fr) 1998-04-08

Family

ID=25538086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94902290A Withdrawn EP0631704A4 (fr) 1992-12-17 1993-11-18 Dispositif et procede d'ajustement adaptatif de la capacite de charge d'un noeuddans un systeme de communication par paquets.

Country Status (4)

Country Link
EP (1) EP0631704A4 (fr)
AU (1) AU659358B2 (fr)
CA (1) CA2128101A1 (fr)
WO (1) WO1994014256A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6009473A (en) * 1997-04-30 1999-12-28 Oracle Corporation Using callbacks to effectively manage resources
US6889257B1 (en) * 1999-12-03 2005-05-03 Realnetworks, Inc. System and method of transmitting data packets
EP1256210A2 (fr) * 2000-02-04 2002-11-13 HRL Laboratories, LLC Systeme de controle de la qualite du service en fonction du prix au sein de reseaux

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0489993A1 (fr) * 1989-12-05 1992-06-17 Motorola, Inc. Amélioration du débit de données

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100377A (en) * 1977-04-28 1978-07-11 Bell Telephone Laboratories, Incorporated Packet transmission of speech
US4377860A (en) * 1981-01-05 1983-03-22 American Microsystems, Inc. Bandwidth reduction method and structure for combining voice and data in a PCM channel
US5115429A (en) * 1990-08-02 1992-05-19 Codex Corporation Dynamic encoding rate control minimizes traffic congestion in a packet network

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0489993A1 (fr) * 1989-12-05 1992-06-17 Motorola, Inc. Amélioration du débit de données

Also Published As

Publication number Publication date
WO1994014256A1 (fr) 1994-06-23
CA2128101A1 (fr) 1994-06-23
AU5670894A (en) 1994-07-04
AU659358B2 (en) 1995-05-11
EP0631704A1 (fr) 1995-01-04

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