CN100358386C - Method for measuring network wireless side time delay - Google Patents
Method for measuring network wireless side time delay Download PDFInfo
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- CN100358386C CN100358386C CNB2004100871475A CN200410087147A CN100358386C CN 100358386 C CN100358386 C CN 100358386C CN B2004100871475 A CNB2004100871475 A CN B2004100871475A CN 200410087147 A CN200410087147 A CN 200410087147A CN 100358386 C CN100358386 C CN 100358386C
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Abstract
The present invention discloses a method for measuring a wireless side time delay in a wireless access network. The method mainly comprises the following steps: a BAM initiates a test and configures corresponding test parameters to a TAP module in base station equipment; the TAP module and an AT establish a test call, and the AT is set in a loop back mode; the TAP module continuously sends forward test application protocol test packages and simultaneously records the package sequence numbers and the sending time of the test packages; after the AT receives every test packet, the information of the package sequence numbers, etc. is packaged to form forward test application protocol loop back frames to loop back; the TAP module receives the loop back frames, records the receiving time, analyzes the package sequence numbers corresponding to the test packages and computes wireless side loop time delay of the network; the TAP module sends a measurement result to the BAM, and the BAM computes the wireless side time delay of the network. The method of the present invention can conveniently measure the wireless side time delay of the wireless network without upgrading the wireless system.
Description
Technical field
The present invention relates to code division multiple access (CDMA) mobile communication technology, specially refer to the method for the packet of a kind of measurement CDMA 2000 1X EV-DO (CDMA 2000 Single 1.25MHzChannel-Evolution-Data Optimized/Only) system in the time delay of access network wireless side.
Background technology
Along with the continuous progress of wireless communication technology and improving constantly of people's living standard, because popularizing fast of the Internet and mobile phone, people earnestly look forward to having the appearance and the use of the wireless communication technology of supporting the high-speed radio Packet Service, can provide abundant mobile multi-media service for users.CDMA 2000 1x EV-DO are exactly a kind of technology that can address the above problem.
CDMA 2000 1x EV-DO standards originate from high data rate (HDR) technology the earliest.December calendar year 2001, CDMA 2000 1x EV-DO technology were received as a branch of CDMA 2000 families to be one of IMT-2000 standard in the meeting of International Telecommunication Union.
CDMA 2000 1x EV-DO have made full use of the asymmetry of data communication service and data service to the less demanding feature of real-time, and forward link is designed to the CDMA Channel of Time Division Multiplexing.For forward link, in given certain in a flash, a certain user will obtain whole power of CDMA 2000 1xEV-DO carrier waves.In addition, no matter be control information transmission or transport service information, always the carrier wave of CDMA 2000 1x EV-DO is with full power transmissions.
In CDMA 2000 1x EV-DO networks, the transmitting power of forward link is constant, does not promptly have power control mechanism.But it has adopted rate controlled mechanism, and speed changes along with forward direction radio frequency link quality.The base station does not determine the speed of forward link, but by the best data rate of the request of accessing terminal.
According to the transmission quality of forward direction radio frequency link, accessing terminal to require 9 kinds of data rates, and minimum is 38.4Kb/s, is up to 2457.6Kb/s.
CDMA 2000 1x EV-DO systems utilize the re-transmission of lost data packets of eating dishes without rice or wine of the retransmission mechanism of radio link protocol (RLP) layer definition, and then guarantee that the receiving terminal of wireless network can correctly receive data.The retransmission mechanism of RLP layer has defined two timers: transmitting terminal waits for a period of time after sending all data cached bags, if the upper strata does not have new data, can recombinate and send last byte of data last time, tell that the recipient can be the timer T of the data in the own buffer memory toward the upper strata transmission
RLPFlush, and receiving terminal is at the timer T that waits for the transmit leg retransmission data packet may
RLPAbortTransmitting terminal RLP layer is according to timer T
RLPFlushWhether overtime, select whether to carry out the re-transmission of last byte number certificate, this situation appears at data volume when interrupted and a small amount of; And receiving terminal RLP layer is according to timer T
RLPAbortWhether overtime, select whether to continue to wait for the packet that receives own request retransmission.In practical operation, above-mentioned two parameters are set to the constant of agreement regulation usually, but it is apparent, above-mentioned two parameters all have comparatively directly relation with the time delay of wireless side, if the value of these two parameters is compared with the current wireless side time delay and differed bigger, then will produce very big influence to the performance that retransmits.Wireless side time delay of the present invention is meant that packet sends from base station side, arrives the time delay that accesses terminal through wireless access network.
In addition, because the communication environments of wireless access system Radio Access Network is more abominable, the time delay of signal and decay are at the relative laser propagation effect of understanding serious deterioration data service in relatively poor of wireless propagation environment.According to statistics, in CDMA 2000 1x EV-DO networks, the time delay of whole service 80% all owing to wireless side.The simulated environment of chamber by experiment under the constant situation of other conditions of maintenance, changes wireless side time delay, simultaneously the data performance of services is tested, and test data is as follows:
Table 1
| Increase time delay (ms) | 0 | 50 | 100 | 200 |
| Forward direction speed (Mb/s) | 2.2 | 1.3 | 0.73 | 0.4 |
When the wireless side time delay recruitment was increased to 200ms by 0ms, the forward direction speed of CDMA2000 1x EV-DO system had just dropped to 0.4Mb/s from 2.2Mb/s as can be seen from Table 1.Therefore, wireless side time delay is that network is observed, the important parameter of performance comparison.But, in the agreement of present CDMA 2000 1xEV-DO, do not stipulate the method for testing of wireless side time delay.
A kind of relatively method of test wireless side time delay commonly used is loop time delay and then the definite wireless side time delay by the measuring system wireless side, loop time delay of the present invention is meant that packet sends out from base station side, arrival accesses terminal through wireless access network, handle the back loopback through accessing terminal, once more through the time delay of wireless access network to base station side.Because the wireless side loop time delay twice of wireless side time delay normally, therefore, using said method can be simply and effectively obtain the wireless side time delay of system.
In CDMA 2000 1X systems, can calculate the loop time delay of CDMA 2000 1X system wireless sides usually by the signalling interactive process in the RLP layer initialization procedure.Concrete steps are as follows:
A, base station side send synchronization message to travelling carriage, and the record delivery time;
After b, travelling carriage receive synchronous signaling, return synchronous response message to the base station;
After c, base station side received synchronous response message, recorder constantly;
D, base station side calculate the time of reception of being write down and the difference of delivery time, obtain the loop time delay of wireless side.
But because CDMA 2000 1x EV-DO systems do not support above-mentioned RLP layer signaling, therefore, CDMA 2000 1x EV-Do systems can't directly use said method to measure the wireless side loop time delay.
A method that addresses the above problem is exactly CDMA 2000 1x EV-DO systems to be upgraded, to support above-mentioned RLP layer protocol.But all devices in the whole C DMA 2000 1x EV-DO systems upgraded to be one and to expend time in and the thing of manpower, has implemented certain degree of difficulty.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method of the CDMA of measurement 2000 1x EV-DO access network wireless side time delays, can effectively measure the wireless side time delay of CDMA 2000 1x EV-DO access networks, be used to analyze the performance of Radio Access Network, and do not need existing system is upgraded.
The method of testing of the wireless side time delay in the network of the present invention, be used for test data wrap in the base station and access terminal between time delay, mainly may further comprise the steps:
A, after accessing terminal of the Test Application protocol module of base station side and test set up test call, being provided with accesses terminal is loopback mode;
The Test Application protocol module of b, base station side sends forward direction Test Application protocol test bag to accessing terminal, and writes down the bag sequence number and the delivery time of this test pack simultaneously;
C, access terminal receive forward direction Test Application protocol test bag after, will comprise that the information package of forward direction Test Application protocol test bag bag sequence number forms forward direction Test Application agreement loopback frame, and be looped back to the Test Application protocol module of base station side;
The Test Application protocol module of d, base station side receives the forward direction Test Application agreement loopback frame of loopback, the moment of recorder and the bag sequence number of resolving corresponding forward direction Test Application protocol test bag, the wireless side loop time delay of computing network;
The Test Application protocol module of e, base station side is reported to operating maintenance terminal with the wireless side loop time delay that calculates, the wireless side time delay of operating maintenance terminal computing network.
The method of the invention further comprised before step a: a0, operating maintenance terminal are initiated forward direction Test Application protocol test to the Test Application protocol module of base station side.
Step a0 of the present invention further comprises: operating maintenance terminal comprises the test parameter in the cycle that information reports to the Test Application protocol module configuration of base station side;
Step e is described report into: the Test Application protocol module of base station side is according to the information report cycle of operating maintenance terminal configuration, the wireless side loop time delay that periodic report calculates.
Step a0 of the present invention further comprises: the Test Application protocol module carries out legitimacy to the test parameter that is disposed and detects, if correct, then reply acknowledge message and gives operating maintenance terminal, execution in step a then; Otherwise, finish this test operation.
The described calculating of steps d of the present invention is specially: the Test Application protocol module is with the delivery time that deducts the test pack of the identical bag sequence number of having of record the time of reception of forward direction Test Application agreement loopback frame.
In step b, the Test Application protocol module sends continuously a plurality of forward direction Test Application protocol test bags, and the bag sequence number of the test pack of each transmission and delivery time information are recorded in the data structure that the Test Application protocol module sets up;
In step c, access terminal after receiving each forward direction Test Application protocol test bag, form forward direction Test Application agreement loopback frame respectively, and be looped back to the Test Application protocol module of base station side;
In steps d, the Test Application protocol module of base station side is after receiving each loopback frame, and recorder constantly and resolve the bag sequence number of corresponding forward direction Test Application protocol test bag is calculated the wireless side loop time delay of each test pack place network respectively.
The described calculating respectively of steps d further comprises: the Test Application protocol module is searched the delivery time of the forward direction Test Application protocol test bag with identical bag sequence number in the data structure of setting up, and utilizes the delivery time of each the forward direction Test Application protocol test bag that writes down and the wireless side loop time delay that calculates test pack place network the time of reception.
Described steps d further comprises after calculating the wireless side loop time delay of network: the Test Application protocol module compares and calculates the wireless side loop time delay of each forward direction Test Application protocol test bag place network of calculating, obtain the maximum and the minimum value of the wireless side loop time delay of network, and the mean value of the wireless side loop time delay of network;
Described the reporting of step e is specially: maximum, minimum value and the mean value of the wireless side loop time delay of the test pack place network that the Test Application protocol module obtains processing report operating maintenance terminal.
The wireless side time delay of the described computing network of step e is specially: operating maintenance terminal with the wireless side loop time delay of the network that reports divided by 2 wireless side time delays as network.
The method of the invention further comprises: operating maintenance terminal is shown to the user with the wireless side time delay of the network that calculates.
This shows, the method of using measurement CDMA 2000 1x EV-DO access network wireless side loop time delays of the present invention can be by loopback (Loopback) pattern of forward direction Test Application agreement (FTAP) definition, measure the loop time delay of CDMA 2000 1x EV-DO network wireless sides easily, thereby further calculate the delay parameter of wireless side, be used to analyze the performance of Radio Access Network, and need not the base station equipment in the CDMA 2000 1x EV-DO systems and access terminal to upgrade, be easy to the enforcement of method of measurement.
Description of drawings
Fig. 1 is the system configuration schematic diagram of test CDMA 2000 1x EV-DO network wireless side ring road time delays of the present invention;
Fig. 2 is the method for measurement flow chart of the loop time delay of CDMA 2000 1x EV-DO network wireless sides of the present invention.
Embodiment
The invention discloses a kind of method of the CDMA of measurement 2000 1x EV-DO network wireless side time delays, the forward direction Test Application agreement (FTAP that this method utilizes the Test Application standard of CDMA 2000 1x EV-DO to provide, Forward Test Application Protocol) access network (AN in the test network, Access Network) and the time delay between (AT, Access Terminal) of accessing terminal.
Fig. 1 is the system configuration schematic diagram of test CDMA 2000 1x EV-DO network wireless side ring road time delays of the present invention.As shown in Figure 1, in order to realize the FTAP function, CDMA 2000 1xEV-DO systems comprise an operating maintenance terminal (BAM) in its base station side, and BAM provides friendly interface for the user, realize the user to the configuration of CDMA 2000 1x EV-DO system base-station equipment, administer and maintain.Base station side also should comprise a Test Application agreement (TAP) functional module, and this module realizes the function in the base station side realization of FTAP regulation.The TAP module is connected with the BAM that finishes management function by internal interface, and corresponding FTAP test is carried out in the instruction that receives the BAM module.TAP also selects Dispatching Unit (Selection ﹠amp by the frame of internal interface and base station; Distribution Unit) connect, test packet is sent to SDU, and from SDU acceptance test response data.SDU finishes the selection and the distribution of Frame, and the access point (AP) by the base station, and promptly transceiver is realized mutual with AT.Because above-mentioned BAM, TAP module, SDU module and AP all are modules that existing CDMA 2000 1xEV-DO system base-station side apparatus itself have had, therefore, the method of testing of wireless side time delay of the present invention can make full use of the resource realization of existing equipment, and does not need existing base station equipment and access terminal to improve.
Fig. 2 is the method for measurement flow chart of the loop time delay of CDMA 2000 1x EV-DO network wireless sides of the present invention.As shown in Figure 2, method of measurement of the present invention mainly may further comprise the steps:
Step 201:BAM initiates the FTAP test, sends to begin the TAP module that test (Start Test) message is given the base station, disposes the period T Period_Report that the TAP module information of carrying out reports simultaneously;
Step 202: after the TAP module of base station is received the beginning test post of BAM transmission, at first message data is carried out legitimacy and detect, if correct, then reply and confirm (Confirm) message to BAM, execution in step 203 then; If mistake then abandons the beginning test post that receives, finish then;
Step 203: module corresponding among the TAP module of base station and the AT consults to set up the FTAP test call together; In this step, the FTAP test call that the foundation of FTAP test call and the FTAP standard of CDMA 2000 1x EV-DO provide to set up process consistent;
Step 204: it is loopback mode that the TAP module of base station is provided with AT;
Need to prove, in method of the present invention, the packet of the TAP module of base station side all will be transmitted through SDU module and AP could arrive AT, simultaneously, the packet that AT sends to the base station all needs could arrive TAP through the forwarding of AP and SDU module, and SDU module and AP do not have other special functions in method of the present invention, therefore, simple on describing, this step and below narration in, omitted the repeating process of SDU module and AP, only with the TAP module as the TAP module, the representative explanation TAP module of SDU module and AP and the reciprocal process between the AT;
Step 205: the TAP module of base station sends a plurality of FTAP test packs continuously in the period T Period_Report that information reports, and writes down the bag sequence number and the delivery time of each FTAP test pack;
In this step, the bag sequence number of FTAP test pack and delivery time information can be recorded in the data structure of base station side TAP module foundation;
After step 206:AT receives each FTAP test pack, the information such as bag sequence number of each FTAP test pack can be packed respectively according to the Test Application standard of CDMA 2000 1x EV-DO and to form a plurality of FTAP Loopback frame loopbacks;
Step 207: after the TAP module of base station is received each FTAP Loopback frame of AT loopback, write down the bag sequence number of the corresponding FTAP test pack of record in each FTAP Loopback frame and the moment of reception respectively, the delivery time that deducts the FTAP test pack with identical bag sequence number that writes down in the data structure time of reception of the FTAP test pack of each reception is just obtained the wireless side loop time delay T of each FTAP test pack in system's access network
Round_Trip
Need to prove, in this step, after the TAP module of base station is received each FTAP Loopback frame of AT loopback, need to resolve at first respectively the bag sequence number of the FTAP test pack that writes down in each FTAP Loopback frame, and in its data structure, search to wrapping the FTAP test pack record of sequence number, to determine the delivery time of this test pack;
Step 208: the period T that base station TAP module reports in information
Period_ReporlEach the FTAP test pack that in time step 207 is calculated is at the loop time delay T of system wireless side
Round_TripBe further processed, all calculating and the wireless side loop time delay that calculates are compared the period T that the information of obtaining reports
Period_ReporlInterior wireless side loop time delay T
Round_TripMaximum, minimum value and mean value, and with information report cycle T
Period_ReportFor the cycle reports wireless side loop time delay T to BAM
Round_TripMaximum, minimum value and mean value;
The information calculations that step 209:BAM reports according to base station side obtains the wireless side time delay of system, and result of calculation is shown to the user;
Because the wireless side loop time delay of access network roughly is about 2 times of wireless side time delay, therefore, in this step, with maximum, minimum value and the mean value of the wireless side loop time delay of the access network that reports respectively divided by 2 maximum, minimum value and the mean values that just can obtain wireless side time delay.
From above-mentioned steps 201 as can be seen to step 209, method of measurement of the present invention, make full use of the FTAP that the Test Application standard of CDMA 2000 1x EV-DO provides, packet loopback between AN and AT has been set, calculated the time delay of CDMA 2000 1x EV-DO network wireless sides.And need not base station equipment and AT in the CDMA 2000 1x EV-DO systems are upgraded.
More than lift preferred embodiment; the purpose, technical solutions and advantages of the present invention have been carried out further detailed description; institute is understood that; the above is the preferred embodiments of the present invention; not in order to show the present invention; within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, the method for testing of the wireless side time delay in a kind of network, be used for test data wrap in the base station and access terminal between time delay, it is characterized in that this method mainly may further comprise the steps:
Test call is set up in accessing terminal of the Test Application protocol module of a, base station side and test, and is provided with to access terminal and is loopback mode;
The Test Application protocol module of b, base station side sends forward direction Test Application protocol test bag to accessing terminal, and writes down the bag sequence number and the delivery time of this test pack simultaneously;
C, access terminal receive forward direction Test Application protocol test bag after, will comprise that the information package of forward direction Test Application protocol test bag bag sequence number forms forward direction Test Application agreement loopback frame, and be looped back to the Test Application protocol module of base station side;
The Test Application protocol module of d, base station side receives the forward direction Test Application agreement loopback frame of loopback, the moment of recorder and the bag sequence number of resolving corresponding forward direction Test Application protocol test bag, the wireless side loop time delay of computing network;
The Test Application protocol module of e, base station side is reported to operating maintenance terminal with the wireless side loop time delay that calculates, the wireless side time delay of operating maintenance terminal computing network.
2, the method for claim 1 is characterized in that, described method further comprised before step a: a0, initiate forward direction Test Application protocol test by operating maintenance terminal to the Test Application protocol module of base station side.
3, method as claimed in claim 2 is characterized in that, described step a0 further comprises: operating maintenance terminal comprises the test parameter of information report cycle to the Test Application protocol module configuration of base station side;
Step e is described report into: the Test Application protocol module of base station side is according to the information report cycle of operating maintenance terminal configuration, the wireless side loop time delay that periodic report calculates.
4, method as claimed in claim 3, it is characterized in that described step a0 further comprises: the Test Application protocol module carries out legitimacy to the test parameter that is disposed and detects, if correct, then reply acknowledge message and give operating maintenance terminal, execution in step a then; Otherwise, finish this test operation.
5, the method for claim 1 is characterized in that, the described calculating of steps d is specially: the Test Application protocol module is with the delivery time that deducts the test pack of the identical bag sequence number of having of record the time of reception of forward direction Test Application agreement loopback frame.
6, the method for claim 1, it is characterized in that, in step b, the Test Application protocol module sends continuously a plurality of forward direction Test Application protocol test bags, and the bag sequence number of the test pack of each transmission and delivery time information are recorded in the data structure that the Test Application protocol module sets up;
In step c, access terminal after receiving each forward direction Test Application protocol test bag, form forward direction Test Application agreement loopback frame respectively, and be looped back to the Test Application protocol module of base station side respectively;
In steps d, the Test Application protocol module of base station side is after receiving each loopback frame, recorder constantly and resolve the bag sequence number of corresponding forward direction Test Application protocol test bag is calculated the wireless side loop time delay of each forward direction Test Application protocol test bag place network respectively.
7, method as claimed in claim 6, it is characterized in that, the described calculating respectively of steps d further comprises: the Test Application protocol module is searched the delivery time of the forward direction Test Application protocol test bag with identical bag sequence number in the data structure of setting up, and utilizes the delivery time of each the forward direction Test Application protocol test bag that writes down and the wireless side loop time delay that calculates test pack place network the time of reception.
8, method as claimed in claim 6, it is characterized in that, described steps d further comprises after calculating the wireless side loop time delay of network: the Test Application protocol module compares and calculates the wireless side loop time delay of each forward direction Test Application protocol test bag place network of calculating, obtain the maximum and the minimum value of the wireless side loop time delay of network, and the mean value of the wireless side loop time delay of network;
Described the reporting of step e is specially: maximum, minimum value and the mean value of the wireless side loop time delay of the forward direction Test Application protocol test bag place network that the Test Application protocol module obtains processing report operating maintenance terminal.
9, the method for claim 1 is characterized in that, the wireless side time delay of the described computing network of step e is specially: operating maintenance terminal with the wireless side loop time delay of the network that reports divided by 2 wireless side time delays as network.
10, the method for claim 1 is characterized in that, described method further comprises: operating maintenance terminal is shown to the user with the wireless side time delay of the network that calculates.
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| CN101237657B (en) * | 2007-01-31 | 2012-05-02 | 大唐移动通信设备有限公司 | Method and system for testing base station time delay |
| CN101345662B (en) * | 2008-08-18 | 2011-07-13 | 工业和信息化部电信传输研究所 | Testing device and method for switch delay time in mobile communication switch course |
| CN102083094B (en) * | 2009-11-30 | 2015-04-08 | 西门子公司 | Interference measuring method and apparatus in wireless communication system |
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| CN1359565A (en) * | 1996-12-20 | 2002-07-17 | 艾尔耐特通信公司 | Time slot recovery for remote in-band translator in TDMA wireless system |
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