WO2003045103A1 - Method and arrangement for congestion control in distributed communication networks - Google Patents

Method and arrangement for congestion control in distributed communication networks Download PDF

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Publication number
WO2003045103A1
WO2003045103A1 PCT/SE2002/001673 SE0201673W WO03045103A1 WO 2003045103 A1 WO2003045103 A1 WO 2003045103A1 SE 0201673 W SE0201673 W SE 0201673W WO 03045103 A1 WO03045103 A1 WO 03045103A1
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WO
WIPO (PCT)
Prior art keywords
connection
congestion
controlling unit
units
resource
Prior art date
Application number
PCT/SE2002/001673
Other languages
French (fr)
Inventor
Gert-Jan Van Lieshout
Bengt Andreas Andersson
Patrik Karlsson
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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
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Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to AU2002337538A priority Critical patent/AU2002337538A1/en
Publication of WO2003045103A1 publication Critical patent/WO2003045103A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/74—Admission control; Resource allocation measures in reaction to resource unavailability
    • H04L47/745—Reaction in network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/76—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions
    • H04L47/762—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions triggered by the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/822—Collecting or measuring resource availability data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/824—Applicable to portable or mobile terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0247—Traffic management, e.g. flow control or congestion control based on conditions of the access network or the infrastructure network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control

Definitions

  • the present invention relates to a congestion control method, in particular to transmit congestion information over the Iur-interace, and an arrangement for performing said method in a UMTS Radio Access Network.
  • FIG. 1 The figure shows a part of a UMTS Terrestrial Radio Access Network (UTRAN) 10, which can serve as an example of a distributed network as described above.
  • UTRAN UMTS Terrestrial Radio Access Network
  • Radio Network Controllers (RNC) 11a, lib perform the control of communication connections and network resources and are responsible to provide connections to the Core Network 15.
  • the Radio Network Controllers 11a, lib are connected via Node-B 12a, 12b to a number of cells. Due to the distinction mentioned above, the RNC can take various roles: Regarding network resources, the RNC lib acts as a controlling RNC (CRNC) that is responsible for the control of resources of a part of said network including a number of cells 13b, 13c, each of which serving a plurality of user equipments 14b.
  • CRNC controlling RNC
  • the communication connections i.e.
  • an RNC 11a, lib acts as the serving RNC (SRNC) for those connections that have been set up to or from user equipments 14a, 14b, which were located in the area for which this RNC acts as the controlling RNC.
  • SRNC serving RNC
  • the original RNC 11a still remains the serving RNC for this connection while the second RNC lib, which is in control of the resources that this connection uses, takes the role of a drift RNC (DRNC) that supports the serving RNC 11a with the necessary radio resources; however, without any influence on said connection.
  • DRNC drift RNC
  • a serving RNC can assign certain numbers of transport channels in accordance with defined Transport Format Sets (TFS) .
  • TFS Transport Format Sets
  • a speech connection for instance, can apply three transport channels each of which comprising a number of transport blocks of a well-defined size.
  • a packet data connection on the other hand applies one transport channel comprising a certain number of said transport blocks.
  • the solution herein uses UTRAN as a specific example, but the method can be generalised to apply also to other communication networks where some kind of per- connection flow control is possible.
  • Each RNC in its role as a controlling RNC can order measurements and, correspondingly, it receives regularly measurement reports of the actual load status of the resources for which the RNC is responsible.
  • a congestion is normally caused by a lack of resources, dynamic resources or semistatic resources, which might depend on, e.g., an interference level on the uplink (UL) or a transmission power level for the downlink (DL) that exceed certain acceptable threshold levels.
  • Other congestion indications may depend on, e.g., a shortage of downlink channelisation codes or, generally, on a too high usage of the hardware units in the RBS that is controlled by the RNC.
  • One way to achieve such a reduction is to adjust the applied Transport Format Set, i.e. to reduce the number of transport blocks per transport channel.
  • This adjustment can be done, e.g., by means of a reconfiguration of the communication connection, i.e. an assignment of a new Transport Format Set.
  • This has the advantage that the capacity of the modified communication connection is adapted to the reduced bit rate.
  • a reduction of the flow of user data could also be achieved without any reconfiguration; however, this implies that the capacity of the communication connection is not fully used. Both of these alternatives have their respective advantages and disadvantages and the selection can be done based on, e.g., knowledge of the source to the congestion problem.
  • the distinction between the responsibility for network resources on the one hand and communication connections on the other hand may, in case of a congestion situation, imply the problem that a resource controlling unit, e.g. a DRNC in a UTRAN, that has the best knowledge of the actual resource status and possibilities to resolve a congestion is not the unit that has the permission to modify a connection that is served by a different connection controlling unit, e.g. a SR C in UTRAN.
  • a resource controlling unit e.g. a DRNC in a UTRAN
  • a resource controlling unit e.g. a DRNC
  • indicates a detected congestion to the connection controlling unit i.e. the
  • SRNC for those connections, e.g. over Dedicated Channels
  • the resource controlling unit indicates a proposal for a new Transport Format Set for the connections that are controlled by said connection controlling unit
  • SRNC connection controlling unit
  • the method can optionally inform the connection controlling unit (SRNC) when the congestion situation has been resolved.
  • the arrangement according to the present invention which is located, e.g., in the resource controlling unit (DRNC) , provides means for indicating the congestion status for the resources for which it is responsible and means for proposing adjusted Transport Format Sets in order to resolve a congestion.
  • connection controlling node receives the necessary information to take appropriate actions to resolve a congestion situation depending on the resources that are most scarce.
  • a resource controlling node indicates the end of a congestion situation such that the connection controlling node is informed when a full configuration can be used again.
  • Figure 1 shows a part of a UMTS Terrestrial Radio Access Network (UTRAN) as an example of a distributed network.
  • UTRAN UMTS Terrestrial Radio Access Network
  • FIG. 2 shows a flowchart of the method according to the present invention.
  • Figure 3 shows a time flow diagram for events and messages that result from said events for a first embodiment of the present invention.
  • Figure 4 shows an arrangement according to the present invention in a controller unit of a distributed communication network.
  • FIG. 2 describes the method steps that are performed by the method according to the present invention.
  • the resource controlling units in a network receive regularly a measurement report that illustrates the resource status.
  • a resource controlling unit (DRNC) detects a congestion, block 21, if there is a shortage of at least one of the controlled resources as defined above.
  • the resource controlling unit (DRNC) will initiate load regulation measures for those communication connections for which it is the connection controlling unit.
  • Said load regulation measures imply to limit the rates of certain communication connections to a level below the maximum rate that is currently configured in the Transport Format Set for said connections.
  • an efficient congestion control makes it also necessary to perform load regulation measures for communication connections where the resource controlling unit (DRNC) is not at the same time the connection controlling unit, i.e. the SRNC.
  • the resource controlling unit (DRNC) is not permitted to modify the settings of such connections. Therefore, in a next step, block 22, the resource controlling unit (DRNC) indicates the detected congestion situation to the responsible connection controlling units for one or several connections that it does not control, includes a proposal for load reduction and an indication of the cause of the congestion, thereby allowing the connection controlling units to reduce the rate in a suitable way. Said load reduction can be achieved, e.g., by means of an adjusted Transport Format Set (TFS), i.e. a limitation of the rates for said connections, that is appropriate for the actual load conditions.
  • TFS Transport Format Set
  • the receiving connection controlling units have the option to accept the proposed adjusted Transport Format Set, block 23 Yes, or to reject it, block 23 No.
  • connection controlling unit accepts the proposal as it is based on the available facts of the resource status that has caused the present congestion situation and provides suitable measures to prevent this congestion.
  • the resource controlling unit (DRNC) will implement the new Transport Format Set, block 27.
  • the connection controlling unit (SRNC) has also an option to reject the adjusted Transport Format Set, block 23 No, and either provide an alternative Transport Format Set, block 24 Yes, or simply neglect the reported congestion situation, block 24 No. If the connection controlling unit (SRNC) proposes an alternative Transport Format Set, block 24 Yes, the resource controlling unit (DRNC) should accept this set and adjust the communication connection in question accordingly, block 27.
  • connection controlling unit if the connection controlling unit (SRNC) neither accepts a proposal for an adjusted Transport Format Set nor suggests other kinds of rate limitations for the affected communication connections, the resource controlling unit (DRNC) can consider to initiate other alternative congestion control measures, block 25, to achieve a load reduction and thus resolve the congestion, e.g., to release connections that are served by another connection controlling unit. It could also be a conceivable option to retransmit the adjusted Transport Format Set for a certain number of times and initiate other alternative congestion control measures if the connection controlling unit still does not react.
  • SRNC connection controlling unit
  • DRNC resource controlling unit
  • the resource controlling unit will continue to monitor the congestion status to see if the congestion is resolved, block 28, after that it has performed the ordered measures for a load reduction. If and as long as the congestion is not yet resolved, block 28 No, the resource controlling unit can once again propose further modifications of one or several connections, block 22.
  • the resource controlling unit can indicate the end of the congestion situation to the connection controlling units, block 26, when the congestion situation has been resolved, block 28 Yes.
  • the reporting of the end of a congestion can be done for one or several connections at a time.
  • Figure 3 illustrates the first embodiment of the method according to the present invention by means of a time flow diagram.
  • a DRNC in its role as a resource controlling unit After that a DRNC in its role as a resource controlling unit has detected a congestion 31 it sends a congestion indication message 32 to the SRNC, which is the unit that is in control of connections that use network resources that are handled by said DRNC .
  • the congestion indication message contains information on the detected congestion situation for one or several connections that are not under the control of the DRNC, a proposal for load reduction and an indication of the cause of the congestion, thereby allowing the SRNC to reduce the rate in a suitable way.
  • the SRNC accepts the rate limitations as proposed by the adjusted Transport Format Set 33.
  • the DRNC continues monitoring the congestion status and will, if necessary, send further congestion indications to the SRNC. If the congestion is resolved 35, the DRNC will send a corresponding indication of the end of the congestion to the SRNC .
  • Figure 4 shows a resource controlling unit lib, e.g. a DRNC, in a communication network for performing the method according to the present invention.
  • Said unit comprises means ill for indicating a detected congestion to the connection controlling units for one or several connections, means 112 for proposing an adjusted Transport Format Set to achieve a load reduction for said connections, means 113 for indicating the cause for the congestion such that the connection controlling unit can take suitable actions, and means 114 for implementing the Transport Format Set that has been accepted or proposed by the connection controlling units.
  • means 115 are responsible for indicating to the connection controlling units (SRNC) that a congestion situation has been resolved.
  • SRNC connection controlling units

Abstract

The present invention is about a method and arrangement for congestion control in distributed communication networks. In order to resolve a congestion, resource controlling units in the network report detected congestions to those units that are connection controlling units for connections that apply resources of said resource controlling unit along with a proposal for a new Transport Format Set for these connections. The method can optionally inform the connection controlling unit when the congestion has been resolved.

Description

METHOD AND ARRANGEMENT FOR CONGESTION CONTROL IN DISTRIBUTED COMMUNICATION NETWORKS.
FIELD OF THE INVENTION
The present invention relates to a congestion control method, in particular to transmit congestion information over the Iur-interace, and an arrangement for performing said method in a UMTS Radio Access Network.
BACKGROUND OF THE INVENTION
There is a tendency to design modern communication networks as distributed systems, which inter alia implies a distinction between network resources on the one hand and communication connections on the other hand. Resources may refer to, e.g., the various hardware components that are applied, and, for CDMA-based communication systems, the transmission power level and channelisation codes. In such systems it is a common case that different logical as well as physical units are in control of different parts of the network. One unit is, e.g., responsible for the control of a communication connection while another unit is responsible for the control of the resources that said communication connection uses. This will now be illustrated by means of figure 1. The figure shows a part of a UMTS Terrestrial Radio Access Network (UTRAN) 10, which can serve as an example of a distributed network as described above. Radio Network Controllers (RNC) 11a, lib perform the control of communication connections and network resources and are responsible to provide connections to the Core Network 15. The Radio Network Controllers 11a, lib are connected via Node-B 12a, 12b to a number of cells. Due to the distinction mentioned above, the RNC can take various roles: Regarding network resources, the RNC lib acts as a controlling RNC (CRNC) that is responsible for the control of resources of a part of said network including a number of cells 13b, 13c, each of which serving a plurality of user equipments 14b. Regarding the communication connections, i.e. the Radio Links (RL) , an RNC 11a, lib acts as the serving RNC (SRNC) for those connections that have been set up to or from user equipments 14a, 14b, which were located in the area for which this RNC acts as the controlling RNC. However, when a user equipment 14a moves during an ongoing communication from a first RNC 11a, which is the serving RNC for the corresponding communication connection, to a neighboured RNC lib, the original RNC 11a still remains the serving RNC for this connection while the second RNC lib, which is in control of the resources that this connection uses, takes the role of a drift RNC (DRNC) that supports the serving RNC 11a with the necessary radio resources; however, without any influence on said connection.
Depending on the nature of the traffic of a communication connection, a serving RNC can assign certain numbers of transport channels in accordance with defined Transport Format Sets (TFS) . A speech connection, for instance, can apply three transport channels each of which comprising a number of transport blocks of a well-defined size. A packet data connection on the other hand applies one transport channel comprising a certain number of said transport blocks. The solution herein uses UTRAN as a specific example, but the method can be generalised to apply also to other communication networks where some kind of per- connection flow control is possible.
One important aspect of network control is congestion control. Each RNC in its role as a controlling RNC can order measurements and, correspondingly, it receives regularly measurement reports of the actual load status of the resources for which the RNC is responsible. A congestion is normally caused by a lack of resources, dynamic resources or semistatic resources, which might depend on, e.g., an interference level on the uplink (UL) or a transmission power level for the downlink (DL) that exceed certain acceptable threshold levels. Other congestion indications may depend on, e.g., a shortage of downlink channelisation codes or, generally, on a too high usage of the hardware units in the RBS that is controlled by the RNC. In such situations it is important to take fast actions in order to reduce the load of the affected network part, which implies a reduction of the user data rate. One way to achieve such a reduction is to adjust the applied Transport Format Set, i.e. to reduce the number of transport blocks per transport channel. This adjustment can be done, e.g., by means of a reconfiguration of the communication connection, i.e. an assignment of a new Transport Format Set. This has the advantage that the capacity of the modified communication connection is adapted to the reduced bit rate. Alternatively, a reduction of the flow of user data could also be achieved without any reconfiguration; however, this implies that the capacity of the communication connection is not fully used. Both of these alternatives have their respective advantages and disadvantages and the selection can be done based on, e.g., knowledge of the source to the congestion problem.
SUMMARY OF THE INVENTION
The distinction between the responsibility for network resources on the one hand and communication connections on the other hand may, in case of a congestion situation, imply the problem that a resource controlling unit, e.g. a DRNC in a UTRAN, that has the best knowledge of the actual resource status and possibilities to resolve a congestion is not the unit that has the permission to modify a connection that is served by a different connection controlling unit, e.g. a SR C in UTRAN.
Therefore, it is an object of the present invention to achieve a method and an arrangement that allows to perform a congestion control in a network comprising different resource controlling and connection controlling units.
Briefly, these objects are accomplished by the method according to the present invention, where a resource controlling unit, e.g. a DRNC, indicates a detected congestion to the connection controlling unit, i.e. the
SRNC, for those connections, e.g. over Dedicated Channels
(DCH) , that apply resources of said resource controlling unit (DRNC) . The resource controlling unit indicates a proposal for a new Transport Format Set for the connections that are controlled by said connection controlling unit
(SRNC) and indicates the cause for the congestion such that the connection controlling unit (SRNC) can take suitable measures. The method can optionally inform the connection controlling unit (SRNC) when the congestion situation has been resolved. The arrangement according to the present invention, which is located, e.g., in the resource controlling unit (DRNC) , provides means for indicating the congestion status for the resources for which it is responsible and means for proposing adjusted Transport Format Sets in order to resolve a congestion.
It is a first advantage of the present invention that a connection controlling node receives the necessary information to take appropriate actions to resolve a congestion situation depending on the resources that are most scarce.
It is another advantage of the present invention that a resource controlling node indicates the end of a congestion situation such that the connection controlling node is informed when a full configuration can be used again.
Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding, reference is made to the following drawings and preferred embodiments of the invention.
Figure 1 shows a part of a UMTS Terrestrial Radio Access Network (UTRAN) as an example of a distributed network.
Figure 2 shows a flowchart of the method according to the present invention.
Figure 3 shows a time flow diagram for events and messages that result from said events for a first embodiment of the present invention.
Figure 4 shows an arrangement according to the present invention in a controller unit of a distributed communication network.
DETAILED DESCRIPTION
Figure 2 describes the method steps that are performed by the method according to the present invention. The resource controlling units in a network receive regularly a measurement report that illustrates the resource status. A resource controlling unit (DRNC) detects a congestion, block 21, if there is a shortage of at least one of the controlled resources as defined above. In this case the resource controlling unit (DRNC) will initiate load regulation measures for those communication connections for which it is the connection controlling unit. Said load regulation measures imply to limit the rates of certain communication connections to a level below the maximum rate that is currently configured in the Transport Format Set for said connections. However, an efficient congestion control makes it also necessary to perform load regulation measures for communication connections where the resource controlling unit (DRNC) is not at the same time the connection controlling unit, i.e. the SRNC. The resource controlling unit (DRNC) is not permitted to modify the settings of such connections. Therefore, in a next step, block 22, the resource controlling unit (DRNC) indicates the detected congestion situation to the responsible connection controlling units for one or several connections that it does not control, includes a proposal for load reduction and an indication of the cause of the congestion, thereby allowing the connection controlling units to reduce the rate in a suitable way. Said load reduction can be achieved, e.g., by means of an adjusted Transport Format Set (TFS), i.e. a limitation of the rates for said connections, that is appropriate for the actual load conditions. When the resource controlling unit (DRNC) has sent said indication, the receiving connection controlling units have the option to accept the proposed adjusted Transport Format Set, block 23 Yes, or to reject it, block 23 No. It is most likely that a connection controlling unit accepts the proposal as it is based on the available facts of the resource status that has caused the present congestion situation and provides suitable measures to prevent this congestion. Thus, in a first embodiment of the present invention the resource controlling unit (DRNC) will implement the new Transport Format Set, block 27. However, according to a second embodiment of the present invention the connection controlling unit (SRNC) has also an option to reject the adjusted Transport Format Set, block 23 No, and either provide an alternative Transport Format Set, block 24 Yes, or simply neglect the reported congestion situation, block 24 No. If the connection controlling unit (SRNC) proposes an alternative Transport Format Set, block 24 Yes, the resource controlling unit (DRNC) should accept this set and adjust the communication connection in question accordingly, block 27. Otherwise, block 24 No, if the connection controlling unit (SRNC) neither accepts a proposal for an adjusted Transport Format Set nor suggests other kinds of rate limitations for the affected communication connections, the resource controlling unit (DRNC) can consider to initiate other alternative congestion control measures, block 25, to achieve a load reduction and thus resolve the congestion, e.g., to release connections that are served by another connection controlling unit. It could also be a conceivable option to retransmit the adjusted Transport Format Set for a certain number of times and initiate other alternative congestion control measures if the connection controlling unit still does not react.
In case of both embodiments the resource controlling unit will continue to monitor the congestion status to see if the congestion is resolved, block 28, after that it has performed the ordered measures for a load reduction. If and as long as the congestion is not yet resolved, block 28 No, the resource controlling unit can once again propose further modifications of one or several connections, block 22. The resource controlling unit can indicate the end of the congestion situation to the connection controlling units, block 26, when the congestion situation has been resolved, block 28 Yes. The reporting of the end of a congestion can be done for one or several connections at a time. Figure 3 illustrates the first embodiment of the method according to the present invention by means of a time flow diagram. After that a DRNC in its role as a resource controlling unit has detected a congestion 31 it sends a congestion indication message 32 to the SRNC, which is the unit that is in control of connections that use network resources that are handled by said DRNC . As already explained above, the congestion indication message contains information on the detected congestion situation for one or several connections that are not under the control of the DRNC, a proposal for load reduction and an indication of the cause of the congestion, thereby allowing the SRNC to reduce the rate in a suitable way. In this figure it is presumed that the SRNC accepts the rate limitations as proposed by the adjusted Transport Format Set 33. The DRNC continues monitoring the congestion status and will, if necessary, send further congestion indications to the SRNC. If the congestion is resolved 35, the DRNC will send a corresponding indication of the end of the congestion to the SRNC .
Figure 4 shows a resource controlling unit lib, e.g. a DRNC, in a communication network for performing the method according to the present invention. Said unit comprises means ill for indicating a detected congestion to the connection controlling units for one or several connections, means 112 for proposing an adjusted Transport Format Set to achieve a load reduction for said connections, means 113 for indicating the cause for the congestion such that the connection controlling unit can take suitable actions, and means 114 for implementing the Transport Format Set that has been accepted or proposed by the connection controlling units. In addition to this means 115 are responsible for indicating to the connection controlling units (SRNC) that a congestion situation has been resolved.

Claims

1. A method for congestion control in a communication network (10) comprising at least two controller units
(11a, lib), each of which acting as resource controlling units for a part of the network resources and acting as connection controlling units for connections to and from a plurality of user equipments, whereof at least one of said units (11a) acts as a connection controlling unit for a connection that uses resources of a resource controlling unit (lib) that does not control said connection,
c h a r a c t e r i s e d b y
the resource controlling unit indicating a detected congestion to the connection controlling units of one or several connections,
proposing an adjusted Transport Format Set to achieve a load reduction for said connections along with an indication of the cause for the congestion (22) such that the connection controlling unit can take suitable actions, and
implementing the Transport Format Set (27) that has been accepted (23 Yes) or proposed (24 Yes) by the connection controlling units.
2. The method according to claim 1, whereby the resource controlling unit continues to monitor the congestion situation (28) and proposes further modifications of one or several connections (22) if the congestion has not been resolved.
3. The method according to claim 1 or 2, whereby the resource controlling unit indicates to the connection controlling units that a congestion situation has been resolved (26) .
4. The method according to one of claims 1-3, whereby the resource controlling unit performs alternative congestion control measures (25) if the connection controlling unit does not initiate any action triggered by the indication of the resource controlling unit.
5. The method according to claim 4, whereby the alternative congestion control measure is to release the connection.
6. A resource controlling unit (lib) in a communication network (10) comprising at least one more controller unit
(11a), each of which acting as resource controlling units for a part of the network resources and acting as connection controlling units for connections to and from a plurality of user equipments, whereof at least one of said units (11a) acts as a connection controlling unit for a connection that uses resources of a resource controlling unit (lib) that does not control said connection,
c h a r a c t e r i s e d i n
means (111) for indicating a detected congestion to the connection controlling units for one or several connections,
means (112) for proposing an adjusted Transport Format Set to achieve a load reduction for said connections,
means (113) for indicating the cause for the congestion such that the connection controlling unit can take suitable actions,
means (114) for implementing the Transport Format Set that has been accepted or proposed by the connection controlling units .
7. The unit (lib) according to claim 6, comprising means (115) for indicating to the connection controlling units that a congestion situation has been resolved.
PCT/SE2002/001673 2001-11-22 2002-09-16 Method and arrangement for congestion control in distributed communication networks WO2003045103A1 (en)

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