Method for Network Load Shaping in a Mobile Radio Network
A method for network load shaping in a mobile radio network classifies data packets in a packet data stream according to a leaky bucket classification system and optionally delays the data packets in a network device within the mobile radio core network, in order to smooth burst and hence to reduce loss probabilities and the occurrence of delays in the forwarding of data packets from a data source, over the mobile radio network, to a mobile radio terminal in a simple and economical manner.
1 - 11 . (canceled)
12 . A method for network load shaping in a GPRS or UMTS mobile radio network, the mobile radio network having a radio access network and a core network, comprising:
forwarding a packet data flow from a data source to a mobile radio terminal via a network device in the core network and via the radio access network.
classifying data packets of the packet data flow in the network device, the data packets being classified on the basis of a leaky bucket algorithm, the leaky bucket algorithm having a leak rate from a bucket corresponding to a predefined maximum data rate.
performing classification in such a way that a predetermined classification result is obtained for data packets of a series of consecutive data packets if transmission of the data packets in the packet data flow would exceed a maximum data rate. and
handling each data packet in the mobile radio network according to the classification result, the data packets being delayed in forwarding to the mobile radio terminal if the predetermined classification result has been assigned thereto, the data packets being delayed such that the predefined maximum data rate is maintained during transmission of data packets from the network device to the mobile radio terminal, wherein
the packet data flow includes packet data assigned to a logical PDP context connection between the mobile radio terminal and the network device,
the packet data assigned to the logical PDP context connection has an activated PDP context parameter assigned thereto,
the activated PDP context parameter is accessed in order to read out a maximum bit rate and assign a leak rate, and
a supplementary check is performed and the data packets are delayed only if the supplementary check shows that the data packets have a total length that exceeds a maximum bucket size.
13 . The method as claimed in claim 12 , wherein
the data packets are classified is reduced in such a way that no new bursts can arise between the network device and the aggregation point and/or the point at which the maximum available bandwidth is reduced.
14 . The method as claimed in claim 12 , wherein
the data packets are classified upstream from a General Packet Redo Service (GPRS) Gn or Gb interface.
15 . The method as claimed in claim 12 , wherein
the maximum data rate for traffic classes ‘Interactive’ and ‘Background’ is determined according to the maximum bit rate of 3GPP specification TS 23.107.
16 . The method as claimed in claim 12 , wherein
the data packets are classified and handled in an SGSN or GGSN.
17 . The method as claimed in claim 12 , wherein
the data source is external to the mobile radio network, and
network load shaping is performed according to 3GPP specification TS 23.107 (“traffic shaping”) in the radio access network and/or at the data source, and/or
flow control according to 3GPP specification TS 08.18 is performed in the core network upstream of a Gb interface.
18 . The method as claimed in claim 17 , wherein
the data packets of the packet data flow are classified and forwarded or delayed in a SGSN following the flow control according to the 3GPP specification TS 08.18.
19 . The method as claimed in claim 12 , wherein
delayed data packets are buffered in a buffer having a predefined amount of storage space,
data packets for which insufficient storage space is available for buffering are discarded, and
the storage space is predefined in such a way that data packets can be buffered to accomodate bursts occurring in the core network.
20 . The method as claimed in claim 13 , wherein
the data packets are classified upstream from a General Packet Redo Service (GPRS) Gn or Gb interface.
21 . The method as claimed in claim 20 , wherein
the maximum data rate for the traffic classes ‘Interactive’ and ‘Background’ is determined according to the maximum bit rate of 3GPP specification TS 23.107.
22 . The method as claimed in claim 21 , wherein
the data packets are classified and handled in an SGSN or GGSN.
23 . The method as claimed in claim 22 , wherein
The data source is external to the mobile radio network,
network load shaping is performed according to 3GPP specification TS 23.107 (“traffic shaping”) in the radio access network and/or at the data source, and/or
flow control according to 3GPP specification TS 08.18 is performed in the core network upstream of a Gb interface.
24 . The method as claimed in claim 23 , wherein
the data packets of the packet data flow are classified and forwarded or delayed in a SGSN following the flow control according to the 3GPP specification TS 08.18.
25 . The method as claimed in claim 24 , wherein
the delayed data packets are buffered in a buffer having a specific amount of storage space is predefined,
data packets for which insufficient storage space is available for buffering are discarded, and
the storage space is predefined in such a way that data packets can be buffered to accomodate bursts occurring in the core network.
26 . A network device for a core network of a GPRS or VMTS mobile radio network comprising:
a classification module in which a classification scheme based on a leaky bucket algorithm is implemented to classify data packets of a packet data flow arriving at the network device from a data source, which data packets are to be forwarded to a mobile radio terminal connected to the mobile radio network, the leaky bucket algorithm having a leak rate corresponding to a predefined maximum data rate, the classification module assigning a classification result to each data packet;
a constant memory for storing predefined constants for the classification scheme, and
a handling module for handling the data packets according to the classification result assigned thereto, wherein
in order to classify the data packets, the classification module reads out a constant from the constant memory, and assigns the classification result based on the constant and data relating to the data packet,
the classification module passes the classification result to the handling module,
the packet data flow includes that packet data assigned to a logical PDP context connection between the mobile radio terminal and the network device,
the packet data assigned to the logical PDP context connection has an activated PDP context parameter assigned thereto,
the activated PDP context parameter is accessed in order to read out a maximum bit rate and assign the leak rate, and
there is a delay in forwarding the data packets if, in a supplementary check, the data packets have a total length that exceeds a maximum bucket size.
27 . The network device as claimed in‘ claim 26 , wherein
the network device is an SGSN or a GGSN.
28 . The network device as claimed in claim 26 , wherein
the classification module reads out the maximum bit rate from a PDP context memory in the network device, by referring to the activated PDP context parameter, and
the classification module stores the maximum bit rate in the constant memory as a constant for the leak rate.
29 . The network device as claimed in claim 27 , wherein
the classification module reads out the maximum bit rate from a PDP context memory in the network device, by referring to the activated PDP context parameter, and
the classification module stores the maximum bit rate in the constant memory as a constant for the leak rate.