KR20130091467A - Method for measuring traffic delay in client station using udp packets transmitted from server - Google Patents

Abstract

The present invention relates to a method for measuring a traffic delay time, in particular, UDP, which is sent by a server to measure the delay time of actual traffic experienced by a user's mobile terminal when a sudden phenomenon occurs due to a handover in a mobile communication network. (User Datagram Protocol) relates to a method for measuring traffic delay time at a client terminal using a packet.

Description

{Method for Measuring Traffic Delay in Client Station using UDP Packets Transmitted from Server}

The present invention relates to a method for measuring a traffic delay time, in particular, UDP, which is sent by a server to measure the delay time of actual traffic experienced by a user's mobile terminal when a sudden phenomenon occurs due to a handover in a mobile communication network. (User Datagram Protocol) relates to a method for measuring traffic delay time at a client terminal using a packet.

In a mobile communication network, a simple phenomenon due to handover or the like often occurs. For example, when a mobile terminal is moved while being provided with a mobile communication service using a mobile terminal in a cell covered by a base station for mobile communication, the mobile terminal determines a neighboring base station cell through a handover process. Through a base station, a predetermined signaling message is exchanged with the wireless network to maintain a connection with the wireless network to receive a continuous mobile communication service. In the mobile communication network supporting the handover, the uplink or downlink traffic generated during the handover process is suspended, and when the handover process is successfully completed, the pending traffic resumes transmission. During this handover process, the quality of service due to traffic delay is degraded in the mobile terminal. In addition, the obsolescence may occur in a shadow area, and the quality of service may be improved to solve the user's dissatisfaction through the expansion of the base station by accurately measuring the delay time of the actual traffic experienced by the mobile terminal caused by the innocence. There is a need.

Conventionally, in the above handover process, there is a case of using a method of measuring a signaling delay time in a wireless network based on such a message while the mobile station exchanges a predetermined signaling message with the wireless network. However, in the conventional signaling delay measurement method, only the time of handover start and end is measured, and the actual traffic that the user or mobile terminal experiences considering the delay time of the overall traffic from the network layer to the physical layer is felt. Since it does not provide a delay time, a method of more accurately measuring the delay time of the actual traffic experienced by the user's mobile terminal is required.

Accordingly, an object of the present invention is to solve the above-described problem, and an object of the present invention is to include data unilaterally at a side (server) that transmits a message without transmitting or receiving a signal to send or receive a message. By using a unidirectional UDP packet according to the User Datagram Protocol (UDP) protocol for transmitting a message, the client terminal stores each UDP packet periodically transmitted, and the actual traffic delay time when an event (handover, etc.) occurs, The present invention provides a method for measuring a traffic delay time by analyzing and providing a packet error rate and a packet loss amount to more accurately maintain a mobile communication network for improving service quality.

First, to summarize the features of the present invention, according to an aspect of the present invention for achieving the object of the present invention, in the traffic delay time measurement method using a server and a client terminal interworking through a mobile communication network, in the server Periodically transmitting a packet (eg, unidirectional UDP packet) including a sequence number in a header and transmission time information in a payload; And receiving and storing each packet transmitted from the server between the start and the end of occurrence of an event (eg, handover) at the client terminal, and determine the loss of the packet based on the sequence number of each stored packet. And calculating a delay time based on the transmission time information of the packet or the packets before and after the packet and the corresponding reception time information at the client terminal.

The transmission time of each packet calculated using the GPS module in the server is used as the transmission time information, and the reception time of each packet calculated using the GPS module in the client terminal is used as the reception time information.

The event may be a step that occurs due to the influence of the equipment on the mobile communication network or the environment in which the client terminal is located.

The client terminal is handed over as a start and end of the event occurrence by using a signaling message exchanged with a mobile communication network through a mobile communication base station, or base station information including a base station cell identifier or a PSC used for connection with a mobile communication base station. It is possible to determine the attempt and termination of.

The delay time is a radio duration, which is a traffic delay time that is a difference between corresponding reception time information at the client terminal for two packets, and a difference between a time that one packet is received by the client and a GPS time input to the payload portion of the packet. Includes the delay time.

A packet error rate calculated based on a transmission time, a reception time, the delay time, a packet loss amount, or a packet loss amount of each packet received by the client terminal may be provided on a display screen.

According to the traffic latency measurement method according to the present invention, since the unidirectional UDP packet transmitted periodically from the server is used, the analysis of lost packets is simple and easy, and the actual time of event (handover, etc.) without complicated measurement equipment is generated. By providing traffic delay time, packet error rate, packet loss amount, and the like, maintenance of the mobile communication network for improving service quality such as base station extension can be more accurately performed.

1 is a diagram illustrating a mobile communication environment for measuring a traffic delay time according to an embodiment of the present invention.
2 is a view for explaining the structure of a UDP packet according to an embodiment of the present invention.
3 is a view for explaining a client terminal according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of a client terminal according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

1 is a diagram illustrating a mobile communication environment for measuring a traffic delay time according to an embodiment of the present invention.

Referring to FIG. 1, a system 100 for measuring a traffic delay time according to an embodiment of the present invention includes a client terminal 110 and a server 120 interworking with a mobile communication network.

Here, the mobile communication network may relay traffic such as voice call, data service, Internet service interworking with the Internet through mobile communication base stations under the control of an exchange (MSC, VLR, SGSN, etc.) or a controller (RNC). As a mobile communication service providing network, a network for a wireless Internet such as WiBro, a network according to protocols such as Long Term Evolution (LTE), WCDMA, CDMA, and the like may be included.

In the present invention, the server 120 periodically transmits a unidirectional UDP packet, and the client terminal 110 receives the received unidirectional UDP packet and analyzes the lost UDP packet when an event occurs (handover, etc.), thereby delaying the actual traffic delay time and the packet. By providing an error rate or a packet loss amount, consideration of the actual delay time of traffic experienced by a mobile terminal of a general user can be reflected in maintenance for a high quality mobile communication service.

The server 120 may be a computer or a dedicated device such as an operator managed on a mobile communication network or the Internet, and the client terminal 110 may be a dedicated terminal for measuring a traffic delay time capable of the above-described mobile communication service. Smart phones, cellular phones, PCS (Personal Communications Services phones) such as iPods and Android phones equipped with devices or software having functions for measuring traffic latency It may be. In addition, the client terminal 110 may be a notebook PC, a desktop PC, a Palm Personal Computer, or the like, or may be various electronic devices in a home or industrial society that can communicate with other electronic devices through a mobile communication network. have.

The structure of the UDP packet periodically transmitted by the server 120 is shown in FIG. The server 120 periodically transmits a UDP packet including a sequence number in a header and transmission time information (eg, GPS time) in a payload at regular intervals to the client terminal 110. Can be. For example, the server 120 uses the sequence number generated by the means for generating the sequential number and the GPS time, which is the transmission time of the UDP packet calculated using the GPS module and the like, respectively, as a header of the UDP packet. And inserting the payload into the payload, the sequential UDP packets may be periodically transmitted to the client terminal 110 (for example, an IP address, MSISDN, or MAC address, etc. may be used as a destination address). Here, the transmission period of the UDP packet transmitted by the server 120 may be determined according to the basic transmission frame size according to the transmission protocol used, for example, 5msec in the case of WiBro. The GPS (Global Positioning System) module can calculate the GPS time, which is the current reference time, by calculating the exact time from the synchronization signal received from the GPS satellites.

Accordingly, the client terminal 110 receives and stores each UDP packet transmitted from the server 120 between the start and the end of occurrence of an event (handover, etc.) and based on the sequence number of each stored UDP packet. The loss of the packet may be determined, and the corresponding transmission time information (eg, GPS time) of the two packets before and after the lost packet or packets and the corresponding reception time information (eg, GPS module) at the client terminal 110 may be synchronized. Delay time and the like can be calculated and provided based on the GPS time).

The client terminal 110 may determine the occurrence of an event (handover, etc.) in which the interruption (simple) of traffic occurs as described above according to a mobile communication protocol. For example, the client terminal 110 may determine an event between terminals or between the terminal and the Internet as an event. A handover may be included for changing a mobile communication base station relaying traffic between servers. In addition, an environment (eg, a traffic congestion or failure of a device) or a client terminal 110 on a mobile communication network is located. Events (such as interruption of traffic) that occur due to the influence of shadowed areas, etc.) may be included. Hereinafter, the measurement of the traffic delay time of the present invention will be described based on the handover process.

3 is a view for explaining a client terminal 110 according to an embodiment of the present invention. Referring to FIG. 3, the client terminal 110 according to an embodiment of the present invention may include a handover determiner 111, a packet receiver 112, a storage 113, a GPS module 114, and an analyzer 115. ), Such configurations may be implemented in a combination of hardware and software.

The operation of the client terminal 110 will be described briefly as follows.

The handover determination unit 111 determines the start and end of the occurrence of an event (handover, etc.). For example, in order to determine the start or end of the handover, a signaling message transmitted and received by the client terminal 110 with the mobile communication network through the mobile communication base station during handover from the serving base station A to the target base station B, or during handover. Base station information such as a base station cell identifier (eg, cell ID) or primary scrambling code (PSC) used for connection with a mobile communication base station may be used. Even when another event occurs, the start and end of the occurrence of the corresponding event may be determined using a signaling message for the corresponding event.

The packet receiver 112 receives each UDP packet transmitted from the server 120 between the start and the end of the occurrence of an event (handover, etc.) and transmits it to a storage unit 113 such as a memory (DRAM, SRAM, flash RAM, etc.). Save it. The Global Positioning System ( GPS ) module 114 may calculate GPS time, which is a current reference time, by calculating an accurate time using a synchronization signal received from GPS satellites. The packet receiver 112 may store the above GPS time corresponding to each UDP packet in the storage 113 as a corresponding time when receiving each UDP packet.

The analyzer 115 may determine the loss of the packet based on the sequence number of each UDP packet stored in the storage 113, and corresponding transmission time information of the two packets before and after the lost packet or packets (eg, , GPS time) and the delay time, packet error rate, or packet loss based on the corresponding reception time information (for example, GPS time for receiving each packet using the GPS module 114) in the client terminal 110 Can be provided through the display screen.

Hereinafter, the operation of the client terminal 110 according to an embodiment of the present invention will be described in more detail with reference to the flowchart of FIG. 4.

First, the server 120 transmits a UDP packet having a structure as shown in FIG. 2, that is, a UDP packet including a sequence number in a header and transmission time information (eg, GPS time) in a payload. While periodically transmitting to the client terminal 110, the client terminal 110 for measurement may transmit and receive a signaling message for a handover attempt (or start) with the mobile communication network (S10). A measurer or user possessing the client terminal 110 may cause handover while walking or moving to a vehicle, or the client terminal 110 in an area where handover occurs frequently, such as a boundary area of cells covered by mobile communication base stations. The measurement can be started with.

The base station cell identifier (eg, cell ID) or primary scrambling code (PSC) used by the handover determination unit 111 for connection with the mobile communication base station in the presence of the above signaling message or during handover. By determining the change of the base station information, etc., and detecting the start of the occurrence of an event (handover, etc.), the packet receiver 112 receives each UDP packet periodically transmitted from the server 120 (S11) and stores the memory. The data is stored in the storage unit 113 such as (DRAM, SRAM, flash RAM, etc.) (S12). Until the handover determination unit 111 determines the end of the occurrence of the event (handover, etc.) in the above manner, the packet receiver 112 receives each UDP packet transmitted from the server 120 and stores the storage unit 113. ) Can be stored (S13). In this case, the GPS time calculated by the GPS module 114 may be stored together in the storage 113 corresponding to each UDP packet.

On the other hand, the analyzer 115 may determine the loss of the packet on the basis of the sequence number of each UDP packet stored in the storage 113 as described above (S20). For example, assume that the UDP packet stored in the storage 113 and the GPS time calculated by the client terminal 110 are as shown in the following [Table]. In the example as shown in the following [Table], the analysis unit 115 may determine that there is a loss of a packet according to the existence of 5 and 9 where sequence numbers are not consecutive.

In case of such a loss of the UDP packet, the analyzer 115 determines the corresponding transmission time information (eg, GPS time) of two packets (5 and 9 in the above example) before and after the lost packet or packets as described above. ) And the delay time of the wireless section, the traffic delay time, etc. are calculated based on the corresponding reception time information (for example, GPS time for receiving each packet using the GPS module 114) in the client terminal 110 (S21). In operation S22, the calculated information may be provided through a display screen provided in the client terminal 110.

[table]

Taking the above [Table] as an example, the analysis unit 115 provides the corresponding reception time information (eg, GPS) at the client terminal 110 for two packets (5 and 9 in the above example). CB, which is the difference between time, can be calculated as the traffic delay time. Also, the corresponding reception time information (e.g. C) of the late packet (e.g. 9) of two packets (5 and 9 in the above example) can be calculated. ) And the difference Cb between the transmission time information (eg, b) included in the packet (for example, time 5) that is fast in time can be calculated as the delay time of the radio section.

In addition, the analyzer 115 may calculate a packet error rate (PER) or a packet loss amount calculated based on the delay times as described above. In the above example, the PER can be calculated as (packet loss 3) / (total number of packets 5 and 5).

In addition to the transmission time (eg, GPS time at the server) and the reception time (eg, GPS time at the client terminal) of each packet of the above [Table], the analysis unit 115 is analyzed as described above. The delay time of the wireless section, the packet loss amount, or the like, and the packet error rate calculated based on the wireless section may be provided on the display screen.

As described above, according to the traffic delay time measuring method according to the present invention, since the unidirectional UDP packet transmitted periodically from the server is used, analysis of lost packets is simple and easy, so that events (handover, etc.) are not required without complicated measuring equipment. ) Can provide the delay time, packet error rate, packet loss amount, etc. that the user actually experiences, and based on this, maintenance of the mobile communication network for improving the quality of service such as base station extension can be performed more accurately. .

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

Client terminal 110
Handover Determination Unit 111
Packet receiver 112
Storage unit 113
GPS module (114)
Analysis unit 115
Server (120)

Claims (8)

In the traffic delay time measurement method using a server and a client terminal interworking through a mobile communication network,
Periodically transmitting, by the server, a packet including a sequence number in a header and transmission time information in a payload; And
The client terminal receives and stores each packet transmitted from the server between the start and the end of the event occurrence, determines the loss of the packet based on the sequence number of each stored packet, and determines whether the packet is before or after the lost packet or packets. Calculating a delay time based on the transmission time information and corresponding reception time information at the client terminal;
Traffic latency measurement method comprising a. The method of claim 1,
The packet transmission from the server is a traffic delay time measurement method, characterized in that the unidirectional UDP packet. The method of claim 1,
The transmission time of each packet calculated by the server using the GPS module is used as the transmission time information,
And a reception time of each packet calculated by the client terminal using the GPS module as the reception time information. The method of claim 1,
The event is a traffic delay time measurement method, characterized in that it comprises a handover for the change of the mobile communication base station relaying traffic transmission and reception. The method of claim 1,
The event is a traffic delay time measurement method comprising the step that occurs due to the effect of the equipment on the mobile communication network or the environment in which the client terminal is located. The method of claim 1,
The client terminal is handed over as a start and end of the event occurrence by using a signaling message exchanged with a mobile communication network through a mobile communication base station, or base station information including a base station cell identifier or a PSC used for connection with a mobile communication base station. Determining the attempt and termination of the traffic delay time. The method of claim 1,
The delay time is a traffic delay time that is a difference between corresponding reception time information at the client terminal for two packets, and between corresponding reception time information of a later packet among two packets and transmission time information included in a faster packet in time. Traffic delay time measurement method comprising the delay time of the wireless interval which is a difference. The method of claim 1,
Providing a packet error rate calculated on the basis of a transmission time, a reception time, the delay time, a packet loss amount, or a packet loss amount of each packet received by the client terminal through a display screen;
Traffic latency measurement method further comprising.

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