CN115150302B - End-to-end satellite network performance measurement method - Google Patents
End-to-end satellite network performance measurement method Download PDFInfo
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Abstract
The invention relates to an end-to-end satellite network performance measurement method, which comprises the following steps: each node runs a network test program; the user selects a destination terminal, and initiates network performance measurement from the local terminal to the destination terminal; the local terminal sends a test signaling and starts segmented end-to-end network performance measurement; the local terminal initiates network performance measurement with the local gateway station and waits for a segmented measurement feedback result; the local gateway station receives the test signaling, initiates network performance measurement with the local gateway station of the destination terminal, collects measurement results and feeds back the measurement results to the local terminal; the local gateway station of the destination terminal receives the test signaling, initiates network performance measurement with the destination terminal, collects measurement results and feeds back the measurement results to the local terminal; and the local terminal collects and integrates the information of the segment measurement to obtain a final result. The invention carries out subsection recombination on the measurement in a signaling control mode, thereby achieving the lowest influence of the measurement service on other services.
Description
Technical Field
The invention relates to the technical field of network measurement, in particular to an end-to-end satellite network performance measurement method.
Background
The network measurement is to test the running state of the network by using software or hardware tools according to a certain method and technology, measure related measurement objects (such as the measured nodes and links and the states of delay, bandwidth and the like) by a certain measurement means, analyze the captured measurement data, know the network performance and the change condition thereof, and evaluate the network performance, wherein the measurement objects are network indexes for representing the network characteristics.
Currently, the end-to-end available bandwidth measurement basically adopts an active measurement mode, and the available bandwidth measurement model mainly comprises two types PGM (probe gap model) and PRM (probe rate model).
The PGM model assumes that the narrow link and the tight link of the end-to-end path are the same link, and estimates the background traffic and the available bandwidth using the time interval between the sending end and the receiving end of the adjacent probe packets.
In the PRM model, a transmitting end injects detection packets into a network at different detection rates, and when the transmission rate is greater than the available bandwidth, the detection sequence is continuously queued in a tight link, and the unidirectional delay shows an increasing trend. When the transmission rate of the probe packet is lower than the available bandwidth, the unidirectional delay has no significant trend. The transmitting end adjusts the transmitting rate until the turning point of the delay is found, and the transmitting rate at the moment is approximate to the available bandwidth.
Latency is an inherent property of the network and is one of the important indicators for evaluating network performance. The internet engineering task force internet protocol performance index working group divides the delay index into one-way delay (end-to-end delay), round trip delay and delay jitter.
The measurement of the unidirectional delay requires the measurement of the transceiving time at the transceiving ends, thereby calculating the unidirectional delay. Therefore, the main problem of unidirectional delay measurement is whether the clocks of the receiving and transmitting ends are synchronous, and if the clocks of the receiving and transmitting ends are not synchronous, larger errors are generated on the measurement of unidirectional delay. The measurement of unidirectional delay is mainly the problem of clock synchronization at two ends, and the measurement is more complicated. The measurement of round trip delay is only needed to be measured at the transmitting end, the requirement of clock synchronization is not needed, and the measurement is simpler.
With the continuous improvement of the performances of inter-satellite and inter-satellite links, the satellite communication network is interconnected and communicated with the ground wired network by using the inter-satellite links, so that a satellite-ground hybrid network between satellites in different orbits and ground stations can be constructed.
The network measurement of the star-ground hybrid network considers the characteristics of the hybrid network, the hybrid network is provided with a wired network of fixed network equipment, the transmission of messages is not easy to be interfered by the outside, and the network topology, the bandwidth and the time delay are relatively stable. And in the wireless part, satellite-ground link working frequency bands are concentrated in high-frequency bands such as l, c, ku and ka, signals are easily interfered by external factors, and meanwhile, the satellite-ground link working frequency bands have larger delay.
The end-to-end network performance measurement, especially the bandwidth measurement, of the planetary hybrid network according to the traditional measurement means can be influenced by the huge delay of the satellite-to-ground link, and meanwhile, a large amount of bandwidth resources are occupied, so that the progress of other services in the network can be blocked.
Disclosure of Invention
The present invention is directed to an end-to-end performance measurement method for a satellite network, which overcomes the above-mentioned drawbacks of the prior art.
The aim of the invention is realized by the following technical scheme:
the end-to-end satellite network performance measurement method comprises a plurality of gateway stations, wherein the gateway stations communicate through satellite-to-ground links, each gateway station is connected with a plurality of terminals in a local area through a wired link, the communication of the terminals crossing the local area depends on the links among the gateway stations, and the gateway stations and the terminals are collectively called nodes; the method is used for realizing network performance measurement among different local terminals and comprises the following steps:
(1) Each node runs a network test program for completing the response of the user demand, the processing of the test signaling and the calling of the network measurement function; the network test program provides a reachable remote terminal list for a user to select, and meanwhile, the program starts a background process for monitoring network messages;
(2) The user selects a destination terminal, and initiates network performance measurement from the local terminal to the destination terminal; if the target terminal selected by the user is in the same local area with the local terminal, the program directly calls the Ipref to measure the network performance, and the method is ended, otherwise, the subsequent flow is executed;
(3) The network testing program running on the local terminal calls the Ipref to measure the network performance between the local terminal and the local gateway station, and the background process waits for feedback results of all sectional measurements; meanwhile, the local terminal sends two sections of test signaling to a starter set in the corresponding test signaling, and starts the segmented measurement of the end-to-end network performance; setting an initiator as the initiator in the first section of signaling, wherein the initiator is a local gateway station, and the tester is a local gateway station of a target terminal; setting an initiator as the initiator in the second section signaling, wherein the initiator is a local gateway station of the target terminal, and the tester is the target terminal;
(4) After receiving the test signaling, the local gateway station analyzes and processes the test signaling by a network test program, and if the initiator is the gateway station and the tester is a known gateway station, the latest link state information cache between the initiator and the tester is queried, and network performance parameters such as delay, bandwidth and the like are fed back to the initiator;
(5) After receiving the test signaling, the local gateway station of the target terminal analyzes and processes the test signaling by a network test program, and if the initiator is self and the tester is a local node, the local gateway station of the target terminal invokes the Ipref to measure the network performance between the initiator and the tester, collects the measurement result and feeds back the measurement result to the initiator;
(6) The local terminal completes the segment test, the background process integrates the test data and feeds the test data back to the user, wherein the delay information obtained by segment measurement is integrated in a summation mode; and integrating the bandwidth information obtained by the segment measurement in a mode of taking the minimum value.
Further, in step (3), the test signaling is composed of a control header and IP addresses of the initiator, the initiator and the tester, the control header includes a signaling type, a test type flag, an address length and a signaling length, and the type of network performance parameters to be measured is determined by setting the test type flag in the signaling header.
Further, in step (5), the gateway station has its own independent network measurement method, which specifically includes: the gateway station continuously pays attention to network performance, including unidirectional delay, round trip delay and residual bandwidth, adds the information into the network state, obtains the network performance between the gateway stations through periodical network state interaction, and the local gateway station serves as a starting party and feeds back the latest network performance information to the local terminal through a cache inquiring mode.
The invention has the beneficial effects that:
1. the invention carries out subsection recombination on the measurement in a signaling control mode, thereby achieving the lowest influence of the measurement service on other services.
2. The method is improved aiming at the end-to-end performance measurement of a satellite network (satellite-ground hybrid network), and the segmented measurement of the satellite network performance is realized.
3. The invention isolates the satellite link from the wired links at two sides, so that the measured influence range is restricted in a segmented way, the satellite link is protected, and the test cost is reduced.
Drawings
FIG. 1 is a schematic illustration of a segment measurement;
fig. 2 is a schematic diagram of a test signaling structure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The end-to-end satellite network performance measurement method comprises a plurality of gateway stations, wherein the gateway stations communicate through satellite-to-ground links, each gateway station is connected with a plurality of terminals in a local area through a wired link, the communication of the terminals crossing the local area depends on the links among the gateway stations, and the gateway stations and the terminals are collectively called nodes; the method is used for realizing network performance measurement among different local terminals and comprises the following steps:
(1) Each node runs a network test program for completing the response of the user demand, the processing of the test signaling and the calling of the network measurement function; the network test program provides a reachable remote terminal list for a user to select, and meanwhile, the program starts a background process for monitoring network messages;
(2) The user selects a destination terminal, and initiates network performance measurement from the local terminal to the destination terminal; if the target terminal selected by the user is in the same local area with the local terminal, the program directly calls the Ipref to measure the network performance, and the method is ended, otherwise, the subsequent flow is executed;
(3) The local terminal sends a test signaling to a starter set in the signaling, and starts the segment measurement of the end-to-end network performance; the test signaling consists of a control header and IP addresses of an initiator, an initiator and a tester, wherein the control header comprises a signaling type, a test type mark, an address length and a signaling length; the terminal initiating the segment measurement (i.e. the local terminal) sets itself as an initiator in the test signaling, the initial terminal of the measurement segment is the initiator, the final terminal of the measurement segment is the tester, and the type of network performance parameters to be measured is determined by setting a test type mark in the signaling header; when the node receives the test signaling and is used as a starting party designated by the signaling, network performance measurement is carried out between the node and the testing party, and the starting party collects measurement information and feeds the measurement information back to the starting party. Specifically, the local terminal will send two sections of signaling, the initiator is set as itself in the first section of signaling, the initiator is a local gateway station, and the tester is a local gateway station of the target terminal; setting an initiator as the initiator in the second section signaling, wherein the initiator is a local gateway station of the target terminal, and the tester is the target terminal;
(4) The network testing program running on the local terminal calls the Ipref to measure the network performance between the local terminal and the local gateway station, and the background process waits for feedback results of all sectional measurements;
(5) After receiving the test signaling, the local gateway station analyzes and processes the test signaling by a network test program, and if the initiator is the gateway station and the tester is a known gateway station, the latest link state information cache between the initiator and the tester is queried, and network performance parameters such as delay, bandwidth and the like are fed back to the initiator;
(6) The local gateway station of the target terminal receives the test signaling, analyzes and processes the test signaling by a network test program, and if the initiator is self and the tester is a local node, calls the Ipref to measure the network performance between the initiator and the tester, collects the measurement result and feeds back to the initiator;
(7) The local terminal completes the segment test, the background process integrates the test data and feeds the test data back to the user, wherein the delay information obtained by segment measurement is integrated in a summation mode; and integrating the bandwidth information obtained by the segment measurement in a mode of taking the minimum value.
In step (1) and step (2), the network test program provides an interactive interface for user operation, displays the topology structure of the network, and the network measurement module is configurable, including but not limited to the existing technical tools of Iperf, ping and the like.
In the step (3), the signaling comprises an initiator address, a starter address and a tester address, and the signaling is specially suitable for the segmented test feedback scheme of the method; in the control header of the signaling, the signaling type is used for supporting function expansion, the bit combination (1-only test bandwidth, 10-only test delay, 11-test bandwidth and delay) can be used for realizing the selection of network performance parameters to be measured in the test type mark of the test signaling, the address length is used for distinguishing between IPv4 and IPv6 addresses, the length of the former is 4 (bytes), the length of the latter is 16 (bytes), and the signaling length is the byte number of the whole signaling;
in the step (5), the gateway station has an independent network measurement method, and the specific mode is as follows: the gateway station continuously pays attention to network performance, including unidirectional delay, round trip delay and residual bandwidth (in the case of single hop end-to-end, the bandwidth estimation can be performed by adopting a PGM mode, so that the bandwidth estimation is completed with smaller cost), the information is added into a network state, the gateway stations acquire the network performance between each other through periodic network state interaction, the local gateway station serves as a starting party, and the latest network performance information is fed back to the local terminal through a query buffer mode.
The method is improved aiming at the end-to-end performance measurement of a satellite network (satellite-ground hybrid network), and the segmented measurement of the satellite network performance is realized.
The following is a more specific example:
an end-to-end satellite network performance measurement method comprises the following steps:
step 1: each node runs a network test program: configuring a corresponding port number for a test program process;
step 2: the user selects a destination terminal and initiates network performance measurement between the local and the destination terminal;
step 3: the local terminal sends test signaling to start segment end-to-end network performance measurement, the specific signaling format is shown in fig. 2, wherein the signaling type occupies 16 bits, the default value is 0, and the test type mark occupies 4 bits: 0001-test bandwidth, 0010-test delay, 0011-test bandwidth and delay; the address length is set to be the length of the IP address minus 1, the IPv4 address length is 32 bits (4 bytes), and then the address length is configured to be 3 (0011); the signaling length is 16 (the whole signaling occupies 16 bytes in total); the latter three items are an initiator address, a initiator address and a tester address in sequence; controlling the test section by setting addresses of a starter and a tester;
step 4: and the local terminal calls the network performance measurement between the Ipref and the local gateway station and waits for all the segmented measurement feedback results.
Step 5: the gateway stations are obtained through satellite network state interaction, and because the satellite link delay is long, the gateway stations continuously pay attention to network performance, including unidirectional delay, round trip delay and residual bandwidth, the information is added into the network state, the two stations periodically interact, after signaling is received, the gateway station designated as a starting party feeds back measurement information in time, and meanwhile, the interference of a large number of test flows generated by the traditional measurement means on the satellite link is avoided;
step 6: the local gateway station of the destination terminal receives the test signaling, initiates network performance measurement with the destination terminal, collects measurement results and feeds back the measurement results to the local terminal;
step 7: the local terminal collects and integrates the information of the segment measurement (delay sum, bandwidth minimum value) to obtain the final result.
As shown in fig. 1, in satellite communication, a local terminal transmits two signaling to a local gateway station and a local gateway station of a destination terminal, respectively, so that a path between the local terminal and the destination terminal is divided into three segments: the first section is a wired link between the local terminal and the local gateway station, and the local terminal directly invokes a network measurement function to acquire network performance information; the second section is a satellite link, the signaling indicates that the initiator is a local terminal, the initiator is a local gateway station, the tester is a local gateway station of the target terminal, the gateway station automatically collects satellite link information, and after receiving the signaling, the local gateway station sends network performance information between the local gateway station and the target terminal to the local terminal; the third section is a wired link between a local gateway station of the destination terminal and the destination terminal, the signaling indicates that the initiator is the local terminal, the tester is the destination terminal, the local gateway station of the destination terminal is used as the initiator to initiate network measurement, and measurement information is fed back to the local terminal. And finally, the local terminal collects three pieces of information and integrates the three pieces of information according to a mode of taking the minimum value of delay sum and bandwidth.
In a word, the invention isolates the satellite link from the wired links at two sides, so that the measured influence range is restricted in a segmented way, the satellite link is protected, and the test overhead is reduced.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (3)
1. The end-to-end satellite network performance measurement method comprises a plurality of gateway stations, wherein the gateway stations communicate through satellite-to-ground links, each gateway station is connected with a plurality of terminals in a local area through a wired link, the communication of the terminals crossing the local area depends on the links among the gateway stations, and the gateway stations and the terminals are collectively called nodes; the method is characterized by being used for realizing network performance measurement among different local terminals and comprising the following steps of:
(1) Each node runs a network test program for completing the response of the user demand, the processing of the test signaling and the calling of the network measurement function; the network test program provides a reachable remote terminal list for a user to select, and meanwhile, the program starts a background process for monitoring network messages;
(2) The user selects a destination terminal, and initiates network performance measurement from the local terminal to the destination terminal; if the target terminal selected by the user is in the same local area with the local terminal, the program directly calls the Ipref to measure the network performance, and the method is ended, otherwise, the subsequent flow is executed;
(3) The network testing program running on the local terminal calls the Ipref to measure the network performance between the local terminal and the local gateway station, and the background process waits for feedback results of all sectional measurements; meanwhile, the local terminal sends two sections of test signaling to a starter set in the corresponding test signaling, and starts the segmented measurement of the end-to-end network performance; setting an initiator as the initiator in the first section of signaling, wherein the initiator is a local gateway station, and the tester is a local gateway station of a target terminal; setting an initiator as the initiator in the second section signaling, wherein the initiator is a local gateway station of the target terminal, and the tester is the target terminal;
(4) After receiving the test signaling, the local gateway station analyzes and processes the test signaling by a network test program, and if the initiator is the gateway station and the tester is a known gateway station, the latest link state information cache between the initiator and the tester is queried, and the network performance parameters of delay and bandwidth are fed back to the initiator;
(5) After receiving the test signaling, the local gateway station of the target terminal analyzes and processes the test signaling by a network test program, and if the initiator is self and the tester is a local node, the local gateway station of the target terminal invokes the Ipref to measure the network performance between the initiator and the tester, collects the measurement result and feeds back the measurement result to the initiator;
(6) The local terminal completes the segment test, the background process integrates the test data and feeds the test data back to the user, wherein the delay information obtained by segment measurement is integrated in a summation mode; and integrating the bandwidth information obtained by the segment measurement in a mode of taking the minimum value.
2. The method for end-to-end satellite network performance measurement according to claim 1, wherein in step (3), the test signaling is composed of a control header and IP addresses of the initiator, initiator and tester, the control header contains a signaling type, a test type flag, an address length and a signaling length, and the type of network performance parameter to be measured is determined by setting the test type flag in the signaling header.
3. The method for measuring the performance of an end-to-end satellite network according to claim 1, wherein in the step (5), the gateway station has an independent network measuring method, specifically: the gateway station continuously pays attention to network performance, including unidirectional delay, round trip delay and residual bandwidth, adds the information into the network state, obtains the network performance between the gateway stations through periodical network state interaction, and the local gateway station serves as a starting party and feeds back the latest network performance information to the local terminal through a cache inquiring mode.
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