Flow control in packet-switched communication network using leaky bucket algorithm

A technology of flow control and packet network, which is applied in the direction of data exchange network, network flow/resource management, wireless communication, etc., and can solve the problem of packet control unit buffer underflow, limited number of flow control messages, difficulty in determining the data rate, etc. question

Inactive Publication Date: 2004-02-25
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course this is also impractical and leads to a waste of time
[0021] The second problem is the underflow of the buffer in the packet control unit
[0022] The third problem is that the packet control unit needs to control multiple data streams under different conditions
[0023] A fourth problem is that multiple data flows must be controlled by means of a limited number of flow control messages from the packet control unit to the serving GPRS support node
[0027] 3) The number of flow control messages remains limited
[0028] The third and fourth issues together lead to situations where it is difficult to determine the data rate at which the serving GPRS support node transmits data to the packet control unit

Method used

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  • Flow control in packet-switched communication network using leaky bucket algorithm
  • Flow control in packet-switched communication network using leaky bucket algorithm
  • Flow control in packet-switched communication network using leaky bucket algorithm

Examples

Experimental program
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Embodiment Construction

[0044] Figure 2-6 An example of sending data frames from the Internet to GPRS mobile users is shown.

[0045] In the following, the Serving GPRS Support Node is called SGSN, the Gateway GPRS Support Node is called GGSN, and the Packet Control Unit is called PCU.

[0046] It should be noted that a frame is also referred to as a packet hereinafter.

[0047] First, refer to figure 2 Brief understanding of data flow through GPRS network from Internet to GPRS mobile users. Then refer to Figure 3 from the perspective of SGSN, and then refer to Figure 4-6 From the point of view of the PCU, the flow control between the base station subsystem and the SGSN can be understood in more detail.

[0048] exist figure 2 In , consecutive TCP data packets 200 are sent from the Internet to a GPRS mobile station 201 . The data packet is transferred via the Gi interface to the GGSN 202, which further routes the packet to the Serving SGSN 203 via the Gn interface. At the SGSN, the packets a...

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PUM

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Abstract

A buffer in a packet control network unit may overflow or underflow during data transmission from an external network to a user terminal, thus causing many kinds of problems in data transmission. The problems can be prevented in a packet network providing a data flow control algorithm performed by the packet control unit. The packet control unit indicates to the network node, from which it receives data packets, the actual transmission rate of a specified data flow, as well as the buffering capacity for that flow. Then the said network node adjusts its transmission rate for the indicated flow.

Description

technical field [0001] The present invention mainly relates to flow control in telecommunication networks, especially in packet networks. Background technique [0002] In a GSM (Global System for Mobile Communications) network, the data transmission efficiency on ordinary circuit-switched traffic channels is rather low. When all packets have been received, a communication path is established between the transmitter and receiver. In this way, the channel capacity is dedicated to the duration of the connection, even if no data is being transmitted. However, billing is based on connection time. [0003] GPRS (General Packet Radio Service) is a system that supports packet-switched data communications on top of the GSM network infrastructure. The method it provides enables GSM operators to efficiently share physical resources between packet-switched and circuit-switched services. In a GPRS system, each data packet is routed independently from a source to a destination, eg fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L47/21H04L47/30H04Q7/22
CPCH04L47/263H04L47/30H04L47/21H04L47/10H04L47/14H04W28/0231H04W28/0252H04W28/0289H04W8/04
Inventor 格伦贝里·彼得理
Owner NOKIA CORP
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