CN101136796B - Virtual soft switch testing approach - Google Patents
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- CN101136796B CN101136796B CN2007100075898A CN200710007589A CN101136796B CN 101136796 B CN101136796 B CN 101136796B CN 2007100075898 A CN2007100075898 A CN 2007100075898A CN 200710007589 A CN200710007589 A CN 200710007589A CN 101136796 B CN101136796 B CN 101136796B
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Abstract
The method includes steps: (1) making the access terminal carry out data calling, and execute continuous radio data service so as to make the access terminal enter into service state; (2) recording number of byte of data received and sent by each protocol layer, calculating instant data rate in real time; (3) recording control data of data source, control data of data rate in real time, confirming channel indication data; (4) triggering virtual soft switching (VSS) taken place between base stations, and calculating time delay for sending packet data when VSS occurs. Raising reliability and accuracy for determining VSS, and precision of time delay for sending packet data, the invention can reflect quality of sending packet data in switching procedure, and influence on service data rate in up layer directly.
Description
Technical field
The present invention relates to the communications field, particularly, relate to the mobile communications network field tests, relate in particular to a kind of virtual soft switch testing approach.
Background technology
The wireless composite multimedia service, VoIP (Voice Over IP) for example, visual telephone (VT, Video Telephony) demand is growing, driven by this, code division multiple access inserts (CDMA, Code Division Multiple Access) high data rate (HDR of 2000 systems, High Data Rate) technology is developed and becomes the IS856 standard of telecommunications industry association/electronic industries association (TIA/EIA), CDMA 20001x with respect to the IS2000 standard, be called again 1x evolution-data-optimized (EV-DO, Evolution-DataOptimization).
Single shared time division multiplexing (TDM, TimeDivision Multiplex) forward link is adopted in the base station of 1x EV-DO system, and at any time its any sector only provides service for single accessing terminal (AT, Access Terminal).
AT is by data rate control (DRC, Data Rate Control) choice of technology serving sector and data rate, method is as follows: the Signal Interference and Noise Ratio (SINR) of each pilot tone in the AT continuous measurement Active Set, select the serving sector of the sector of SINR maximum as expectation, determine forward data rate according to the SINR value, and pass through the DRC subchannel to access network (AN, Access Network) feeds back fast, wherein, the serving sector of DRC covering marking (DRCCover) indicative of desired, the data rate of DRC value (DRC Value) indication request.When the serving sector of AT expectation is different from its current serving sector, AN sends forward data automatically from the sector that AT selects, finish the switching of serving sector, this selects the handoff procedure of serving sector to be called virtual soft (VSHO by AT, VirtualSoft Handoff), (Fast Cellsite Selection) selected in also express one's gratification sometimes fast sector.
The virtual soft process relate to inside of base station and access terminal and the base station between handshaking, and need require the transfer and the redundant Abis interface business of grouped data usually to two serving sectors, therefore can cause the time delay and the shake of packet data transmission.Usually greater than 200 milliseconds, and for the wireless data service that the such real-time of VoIP is had relatively high expectations, is to guarantee voice call quality based on the actual time delay of virtual soft between the base station of DRC, and its delay variation requires to be lower than 80 milliseconds even littler.
For improving shake and the time delay that virtual soft is brought, guarantee the service quality (QoS of delay sensitive business, Quality of Service) requirement, on basis based on the virtual soft technology of DRC, develop the virtual soft technology that based on data source control (DSC, Data SourceControl) again.
Virtual soft based on DSC, change for the previous period at DRC Cover, send the DSC value (DSCValue) that the sign expectation sends the base station of data by the DSC channel in advance, make radio network controller (RNC, Radio Network Controller) can shift to an earlier date the serving BS (calling target BS) of the forward data of Current Serving BTS (calling source base station) being transferred to expectation, target BS can directly send data when DRC changes, thus the interruption of avoiding data to send.
As shown in Figure 1, the forward link SINR that AT finds base station B in a period of time (110 among Fig. 1) greater than the forward link SINR of Current Serving BTS A, so selecting B is the serving BS of base station, (the change process comprises the empty covering marking of some time slots not have the switching of the DSC that introduces directly to change B by DRC channel indication serving BS into from A, represent with N), base station B is ready to forward data recovery later on to the service of AT, whole group data transmission delay comprises that DRC changes and data are prepared two parts time, as 130 among Fig. 1, and the switching behind the introducing DSC, sending DSC earlier changes to indicate the base station to prepare data in advance, when switching generation, DRC directly sends, the grouped data transmission delay significantly reduces like this, as 150 among Fig. 1.
Deixis morning by the DSC channel, making air interface show as target BS can follow source base station and seamlessly send forward data continuously, but because when DRC changes, target BS also is uncertain of the data byte sequence number that the last success of source base station sends, thereby cause the transmission that repeats of partial data, waste air interface bandwidth, concerning upper-layer service, also brought time delay and shake.Therefore, progressively developed such as by prediction or by source base station directly report determine the initial data that target BS will send, thereby further reduce the technology of time delay.
Yet, for above-mentioned all improve virtual soft time delay and shake, guarantee the technology of delay sensitive wireless packet data application service quality, how to test effectively and become the major issue that needs to be resolved hurrily.
In the AT side, the basic skills of virtual soft measuring technology is the time of last Geju City DRC Cover before record switches between relevant base station, and the time of switching first new DRCCover of back, the difference of calculating both (promptly, the DRC handover delay is as 120 among Fig. 1 and 140) as the grouped data transmission delay.
Wherein, the DRC data are obtained by AT diagnostic data bag (Diagnostic Packet).Because DRC, DSC channel data are every time slot samplings, data volume is very big, and the disposal ability of AT often be not enough to be busy with wireless traffic handle in image data reliably, and the diagnostic data interface is limit by bandwidth to cause data completely not export.As shown in Figure 2, the data disappearance causes the DRC of record, DSC channel data time slot not to be connected, thereby to accurately judging virtual soft and calculating the grouped data transmission delay and bring very big difficulty.On the other hand, though DRC handover delay and the grouped data transmission delay introduced behind the DSC are comparatively approaching, but be not equal to, particularly time delay is low to moderate a few tens of milliseconds, approximate technological development like this for further reduction time delay, precision is obviously not enough, only is simultaneously that the grouped data transmission delay of eating dishes without rice or wine can not reflect whether packet repeats to send, thereby can not reflects the actual influence that upper-layer service is subjected to.
As mentioned above, the virtual soft erroneous judgement problem that exists the data disappearance to cause in the present technical scheme, and can not measure time delay and the quality that grouped data sends reliably.
Summary of the invention
Consider the problems referred to above and make the present invention.For this reason, according to the embodiment of the invention, provide a kind of virtual soft switch testing approach.
This virtual soft switch testing approach may further comprise the steps: first step, and making accesses terminal carries out data call, and carries out continuous wireless data service, is in service condition so that access terminal; Second step, the byte number of real time record protocal layers transceive data calculates the protocal layers instantaneous data rates; Third step, real-time recorded data source control data, data rate control data, acknowledgement channel designation data; And the 4th step, trigger the generation of virtual soft between the base station, and calculate and switch grouped data transmission delay when taking place.
Wherein, in first step, wireless data service comprise following one of at least: Ping, file transfer, web service, stream application, VoIP and visual telephone.
In second step, protocol layer comprise following one of at least:: physical layer, wireless link protocol layer, peer-peer protocol layer, network protocol layer, transmission control protocol layer, User Datagram Protoco (UDP) layer and application layer.In second step, calculate instantaneous data rates V by following formula
y,
V
y＝(C
y-C
x)/(T
y-T
x)
Wherein, C
yBe y total bytes constantly, C
xBe x total bytes constantly, T
yBe y time value constantly, T
xBe x time value constantly, T
y＞T
x
In third step, the data rate control data are obtained from all comprise the diagnostic data bag of data rate control data.
In the 4th step, the method that triggers the generation of virtual soft between the base station comprises: change the position that accesses terminal, make access terminal and Current Serving BTS between distance increase, and the distance between the base station that will switch to is dwindled; Change base station transmitting power, reduce the transmitting power of serving BS, the transmitting power of the base station that increase will switch to.
In addition, in third step, the data source control data comprises: the data source controlling value; The data rate control data comprise following one of at least: data rate control covering marking, data rate control value and data rate control channel locking indication; The acknowledgement channel designation data comprise following one of at least: it is preceding that oppositely preferably Active Set pilot tone, acknowledgement channel are enabled indication and are confirmed/deny indication.
Like this, in the 4th step, judge whether to have taken place virtual soft according to the data rate control data that in third step, write down.Particularly, if empty covering marking appears in the data rate control data that write down in third step, and the data rate control covering marking before and after during the data rate control covering marking is empty covering marking is inconsistent, change the time less than maximum switching time of the threshold value that is provided with by the data rate control covering marking, then judge virtual soft has taken place.
In addition, in the 4th step, by being enabled, first acknowledgement channel behind the data rate control covering marking indicating target base station is designated as the time slot time corresponding value of enabling, last acknowledgement channel is enabled and is designated as the time slot time corresponding value of enabling when deducting from data rate control covering marking indication source base station, calculates and switches grouped data transmission delay when taking place.
By above technical scheme, the present invention has realized following beneficial effect: improved the precision of reliability, accuracy and grouped data transmission delay that virtual soft judges, and can directly reflect grouped data sends in the handoff procedure quality and to the influence of upper-layer service data rate.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the virtual soft sequential chart based on DSC and DRC according to correlation technique;
Fig. 2 is the sequential schematic diagram according to the DRC of the record of correlation technique, DSC channel data disappearance;
Fig. 3 is the schematic diagram according to the grouped data transmission delay of the embodiment of the invention; And
Fig. 4 is the flow chart according to the virtual soft switch testing approach of the embodiment of the invention.
Embodiment
In the technical scheme that the embodiment of the invention provides, consider that AT (accessing terminal) has dissimilar diagnostic data bags to write down the DRC data respectively, the probability of the likelihood ratio single type diagnostic data packet loss that dissimilar diagnostic data bags is lost simultaneously is much smaller, therefore utilize redundant DRC data just can judge more accurately and reliably and switch the start-stop time slot, if the start-stop slot time is greater than possible maximum switching time, think that the judgement of this virtual soft is invalid, further to avoid erroneous judgement; When virtual soft takes place, utilize the ack channel mechanism that realizes the automatic request retransmission of grouped data (ARQ, Automatic Repeat reQuest) to come subsidiary grouped data transmission delay.
The principle of ack channel mechanism is as follows: AN is according to the DRC assigned rate of AT, send packet to AT, the situation that AT receives to the AN feedback by ack channel, if correct demodulation current bag then send the ACK bit indication, the current bag of correct demodulation if fail then send NAK bit indication, AN receives that the ACK bit of AT then begins to send a bag, otherwise retransmits current bag.In the virtual soft process, ack channel forbidding when grouped data sends and to stop, grouped data sends that ack channel reactivates when recovering, thus ack channel to forbid the time interval of enabling be exactly the grouped data transmission delay, shown in 310 among Fig. 3.
Therefore, the virtual soft switch testing approach that the embodiment of the invention provides, utilize the DRC data of dissimilar diagnostic data bags to judge virtual soft start-stop time slot jointly, by being set, maximum threshold value switching time further avoids erroneous judgement, and with the ack channel forbidding time in the handoff procedure as the grouped data transmission delay, assess the actual influence of switching in conjunction with the data rate of protocal layers simultaneously to upper-layer service.
Based on foregoing, come more detailed description the preferred embodiments of the present invention hereinafter with reference to accompanying drawing, provide following examples so that understand the present invention more comprehensively and thoroughly, rather than the present invention is carried out any restriction.
As shown in Figure 4, the virtual soft switch testing approach according to the embodiment of the invention may further comprise the steps: step S402 makes access terminal (AT) carry out data call, and carries out continuous wireless data service, so that AT is in service condition; Step S404, the byte number of real time record protocal layers transceive data calculates the protocal layers instantaneous data rates; Step S406, real-time recorded data source control (DSC) data, data rate control (DRC) data, affirmation (ACK) channel designator certificate; And step S408, trigger the generation of virtual soft between the base station, and calculate grouped data transmission delay when switching generation.
Below will specifically describe the details of above-mentioned each step.
In step S402, AT does data call that is sets up Dial-up Network and connects, and wherein, AT can be wireless Internet card or mobile phone, and Dial-up Network connects based on peer-peer protocol (PPP).The determination methods that AT is in service condition is: whether the state of AT is connection status.
In addition, wireless data service includes but not limited to Ping, file transfer, world wide web (www) business, stream application (Streaming Application), VoIP, VT; The key of wireless data service is to guarantee that continuous packet sends, and makes AT be in service condition, and radio link layer, and/or more high-rise data traffic is arranged.Be applied as example with stream in the present embodiment based on UDP.
In step S404, protocol layer comprises physical layer, radio link protocol (RLP) layer, peer-peer protocol (PPP) layer, procotol (IP) layer, transmission control protocol (TCP) layer, User Datagram Protoco (UDP) (UDP) layer, application layer.Wherein, the data of physical layer and radio link layer can be obtained by AT, the data of PPP, TCP, UDP, IP layer can obtain by the respective protocol packet of record by network interface card, application layer data depends on performed business, present embodiment is to use based on the stream of UDP, and the data that therefore write down the UDP layer get final product.
In addition, in step S404, calculate instantaneous data rates (that is up time throughput) V by following formula
y,
V
y＝(C
y-C
x)/(T
y-T
x)
Wherein, C
yBe y total bytes constantly, C
xBe x total bytes constantly, T
yBe y time value constantly, T
xBe x time value constantly, T
y＞T
xWherein, T
yWith T
xDifference be limited within the scope, depend on the precision of needs usually, or rule of thumb value is set.Like this, by checking and contrast each layer instantaneous data rates in the virtual soft process, can understand the influence of switching intuitively to upper-layer service.
In step S406, the DSC data include but not limited to: data source controlling value (DSCValue); The DRC data include but not limited to: rate controlled covering marking (DRC Cover), data rate control value (DRC Value), the indication of data rate control (DRC) channel locks; The ack channel designation data includes but not limited to: preceding oppositely best Active Set pilot tone (ASP, Active Set Pilot), acknowledgement channel are enabled (ACK Enabled) and are indicated, confirm/deny (ACK/NAK) indication.
In addition, in step S406, be used to the data of judging whether virtual soft successfully takes place and calculate the grouped data transmission delay by AT diagnostic data record.Usually, the diagnostic data bag that comprises the DRC data is a kind of incessantly, because diagnostic data can lack, in order to judge the start-stop time slot of virtual soft accurately and reliably, write down the diagnostic data bag that all comprise the DRC data simultaneously, different model or the different AT of software and hardware version, concrete diagnostic data bag type is also different.
In step S408, trigger the method that virtual soft takes place between the base station and comprise: change the AT position, make it with Current Serving BTS apart from increase, dwindle with the base station distance that will switch to; Change the base station power takes place, reduce the transmitting power of serving BS, the transmitting power of the base station that increase will switch to.Generally adopt a kind of method in back to trigger the generation of virtual soft at laboratory environment, and in real network, commercial network particularly, a kind of method before general the employing, common concrete grammar is for to place AT in the car, car travels by fixed route, and this method is called drive test (DT, Drive Test).
In addition, in step S408, whether virtual soft has taken place is really judged according to the DRC data that step S406 is write down, if empty covering marking appears in the DRC Cover that is write down, and the DRC Cover value before and after during DRC Cover is empty covering marking is different, simultaneously DRC Cover changes the time less than maximum switching time of the threshold value that is provided with, and then is judged as virtual soft has successfully taken place.Owing to write down the dissimilar diagnostic data bag that comprises the DRC data, avoided the imperfect problem of DRC data obtained from the diagnostic data bag of single type to a great extent, thereby reduced erroneous judgement or can't judge.
In step S408, the computational methods of switching grouping transmission delay when taking place are, first ack channel is enabled the time slot time corresponding value that is designated as Enabled behind the DRCCover indicating target base station, deducts last ack channel that begins from DRC Cover indication source base station and enables the time slot time corresponding value that is designated as Enabled.
In addition, can repeated execution of steps S408, to calculate repeatedly the grouping transmission delay of virtual soft.
By means of technique scheme provided by the invention, improved the precision of reliability, accuracy and grouped data transmission delay that virtual soft judges, and can directly reflect grouped data sends in the handoff procedure quality and the influence of upper-layer service data rate.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.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. a virtual soft switch testing approach is characterized in that, may further comprise the steps:
First step, making accesses terminal carries out data call, and carries out continuous wireless data service, so that described accessing terminal is in service condition;
Second step, the byte number of real time record protocal layers transceive data, the instantaneous data rates of calculating protocal layers;
Third step, real-time recorded data source control data, data rate control data, acknowledgement channel designation data; And
The 4th step, trigger the generation of virtual soft between the base station, and grouped data transmission delay when taking place is switched in calculating, wherein, utilize the redundant data rate controlled data that contain in the various diagnostic data bags and judge whether to take place soft handover, utilize the acknowledgement channel forbidding time as described grouped data transmission delay by maximum switching threshold is set.
2. virtual soft switch testing approach according to claim 1 is characterized in that, in described first step, described wireless data service comprise following one of at least: file transfer, web service, stream application, VoIP and visual telephone.
3. virtual soft switch testing approach according to claim 1, it is characterized in that, in described second step, described protocol layer comprise following one of at least: physical layer, wireless link protocol layer, peer-peer protocol layer, network protocol layer, transmission control protocol layer, User Datagram Protoco (UDP) layer and application layer.
4. virtual soft switch testing approach according to claim 1 is characterized in that, in described third step, described data rate control data are obtained from all comprise the diagnostic data bag of data rate control data.
5. virtual soft switch testing approach according to claim 1, it is characterized in that, in described the 4th step, the method that triggers the generation of virtual soft between the base station comprises: change the described position that accesses terminal, make described access terminal and Current Serving BTS between distance increase, and the distance between the base station that will switch to is dwindled; Change base station transmitting power, reduce the transmitting power of serving BS, the transmitting power of the base station that increase will switch to.
6. according to each described virtual soft switch testing approach in the claim 1 to 5, it is characterized in that in described third step, described data source control data comprises: the data source controlling value; Described data rate control data comprise: the data rate control covering marking; Described acknowledgement channel designation data comprise following one of at least: it is preceding that oppositely preferably Active Set pilot tone, acknowledgement channel are enabled indication and are confirmed/deny indication.
7. virtual soft switch testing approach according to claim 6 is characterized in that, in described the 4th step, judges whether to have taken place virtual soft according to the described data rate control data that write down in described third step.
8. virtual soft switch testing approach according to claim 7, it is characterized in that, if empty covering marking appears in the described data rate control data that write down in described third step, and the data rate control covering marking before and after during described data rate control covering marking is empty covering marking is inconsistent, simultaneously time interval of changing of data rate control covering marking is then judged virtual soft has taken place less than maximum switching time of the threshold value that is provided with.
9. virtual soft switch testing approach according to claim 6, it is characterized in that, in described the 4th step, by being enabled, first acknowledgement channel behind the described data rate control covering marking indicating target base station is designated as the time slot time corresponding value of enabling, last acknowledgement channel is enabled and is designated as the time slot time corresponding value of enabling when deducting from described data rate control covering marking indication source base station, calculates and switches grouped data transmission delay when taking place.
10. according to each described virtual soft switch testing approach in the claim 1 to 5, it is characterized in that, in described second step, calculate instantaneous data rates V by following formula
y:
V
y＝(C
y-C
x)/(T
y-T
x)，
Wherein, C
yBe y total bytes constantly, C
xBe x total bytes constantly, T
yBe y time value constantly, T
xBe x time value constantly, T
y＞T
x
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1582586A (en) * | 2001-09-05 | 2005-02-16 | 艾利森电话股份有限公司 | System and method for a virtual soft handover in a high data rate network based on data transmission information |
| EP1524873A2 (en) * | 2003-10-16 | 2005-04-20 | Samsung Electronics Co., Ltd. | Seamless handover method in an FH-OFDM-based mobile communication system |
| CN1887022A (en) * | 2003-10-14 | 2006-12-27 | 高通股份有限公司 | Method and apparatus for data rate control in soft handoff and during cell-switching |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1582586A (en) * | 2001-09-05 | 2005-02-16 | 艾利森电话股份有限公司 | System and method for a virtual soft handover in a high data rate network based on data transmission information |
| CN1887022A (en) * | 2003-10-14 | 2006-12-27 | 高通股份有限公司 | Method and apparatus for data rate control in soft handoff and during cell-switching |
| EP1524873A2 (en) * | 2003-10-16 | 2005-04-20 | Samsung Electronics Co., Ltd. | Seamless handover method in an FH-OFDM-based mobile communication system |
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