CN101010914A - A method and system for error differentiating in wireless networks - Google Patents
A method and system for error differentiating in wireless networks Download PDFInfo
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- CN101010914A CN101010914A CNA2005800293016A CN200580029301A CN101010914A CN 101010914 A CN101010914 A CN 101010914A CN A2005800293016 A CNA2005800293016 A CN A2005800293016A CN 200580029301 A CN200580029301 A CN 200580029301A CN 101010914 A CN101010914 A CN 101010914A
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- rss
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- radio station
- received signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Small-Scale Networks (AREA)
Abstract
A method and system of determining whether a transmission error is caused by channel conditions for use with determining the transmission characteristics of a mobile station in a wireless local area network (WLAN) are provided. The method and system includes the detecting a transmission time out condition of a transmitted frame; and determining whether a transmission error associated with the time out condition was caused by the channel conditions using a Received Signal Strength (RSS) value from a plurality of incoming frames received by a mobile station.
Description
The present invention relates to communication system.The invention particularly relates to a kind of be used for wireless network distinguish since channel condition caused wrong and because disturb and mistake that conflict is caused so that regulate the system and method for station characteristic, described wireless network such as IEEE 802.11 WLAN (wireless local area network) (wireless local area network WLAN) more accurately.
IEEE 802.11 standards are wireless lan (wlan) regulation medium access control (medium access control MAC) and physical characteristic so that support physical layer element.In the 1999 international standard ISO/IEC 8802-11 " Information Technology-Telecommunications and Information Exchange Area Networks " that publish, defined IEEE 802.11 standards, its full content has been introduced for your guidance at this.
IEEE 802.11 physical layers (Physical Layers PHY) have defined a plurality of transmission rates according to different modulation and channel coding schemes, make the transmitter of frame to select one of a plurality of speed at receiver and the wireless channel conditions between self in specific time basis.Usually, transmission rate is low more, transmits reliable more.
In this wireless system, propagate and interference environment since such as station mobility, the time exsiccation disturbing and conflicting factor and in time and spatial variations.As a result, not existing can all be optimum single PHY pattern (modulation and encoding mechanism) in all cases.Advised that link circuit self-adapting (Link adaptation LA) algorithm relaxes this problem, wherein makes modulating mode optimally be suitable for the usefulness that current link condition is improved system by modification.
In particular, the LA algorithm makes dispatching station can revise transmission rate by using received signal intensity (Received SignalStrength RSS) as the link-quality index, and the signal strength signal intensity of described reception measures from the frame that access point (access point AP) is received according to it.Do not considering SNR/SIR owing under the situation of interference or multichannel decay and fluctuation rapidly, suppose on average have linear relationship between RSS and the SNR.Therefore, as the power of the function of distance and path loss conditions concerning estimation the PHY pattern of suitable coupling be very useful to be used for next transmission.This link circuit self-adapting algorithm has been described in Application No. XXXXXXXX co-pending in the lump, at this by reference in addition in conjunction with for your guidance.
The variation of RSS shows that the condition of Radio Link changes between station and AP, and may since between described station and AP bigger distance or higher path loss and correspondingly be necessary to revise transmission rate.Yet prior art LA adaptive algorithm is supposed described mistake all the time owing to low RSS causes, thereby may carry out self adaptation improperly.For example, other error source that is occurred in wireless radio channels is at the interference noise of receiving station and in the conflict of receiving station and multichannel decay.Since other station on same channel and the interference behavior (as microwave) that other transmitting apparatus caused almost be pulsed and be of short duration.The LA algorithm should be for by disturbing or conflicting caused error of transmission and revise its speed and do not change the RSS threshold value in this case.In view of the above, need differentiation because wrong and because the mistake that interference is caused that low RSS (for example poor channel condition) is caused.
The present invention relates to a kind of be used for wireless network distinguish since the channel condition of difference (such as distance), decay and high path loss are caused wrong and because disturb and mistake that conflict is caused so that regulate the system and method for station characteristic, described wireless network is such as wireless lan (wlan).Use this information to conclude then and wrong type and their different processing modes (for example, any other that maybe needs to determine the lost frames reason for the application such as power control used) occur.
One aspect of the present invention relates to and a kind ofly is used for determining that whether error of transmission is caused the method for (transmission rate that this for example is used for determining a plurality of transmission rate mobile radio stations then) by channel condition.Said method comprising the steps of: the overtime condition of transmission that detects transmit frame; And use received signal intensity (RSS) value that comes from a plurality of incoming frames that receive by mobile radio station to determine whether the error of transmission that is associated with overtime condition is caused by channel condition.
Another aspect of the present invention relates to a kind of mobile radio station that is used for error differentiating between two mobile radio stations of wireless network, and described station comprises: acceptor circuit is used for the demodulation incoming frame; Power-measuring circuit, the received signal intensity (RSS) of the incoming frame that is used to measure wherein and is received; With the processor that is coupled to described power-measuring circuit, be used for determining the overtime condition of transmission of transmit frame and received signal intensity (RSS) value that use comes from a plurality of incoming frames that received by described mobile radio station come definite error of transmission that is associated with described overtime condition whether to be caused by channel condition.
According to the more detailed description of looking like illustrated preferred embodiment in the accompanying drawing down, above-mentioned and other feature and advantage of the present invention will be clearer, wherein spread all over each view Reference numeral and refer to identical part.
Fig. 1 is the simplified block diagram that is used to illustrate the architecture of the wireless communication system of using the embodiment of the invention;
Fig. 2 illustrates the simplified electrical circuit diagram that connects and each station at 8 in specific Basic Service Set (BSS) according to the embodiment of the invention;
Fig. 3 is the graphic extension that is used to regulate the transmission benchmark of transmission rate according to the embodiment of the invention; With
Fig. 4 be used for according to embodiment of the invention diagram distinguish since difference channel condition caused wrong and because disturb and mistake that conflict is caused so as to regulate transmission rate the flow chart of operating procedure.
Though following system block diagram with particular reference to Fig. 1 has been described the present invention, yet be to be understood that in description subsequently and can adopt the mode of other foundation structure to use just communicate by letter with another station via wireless medium in one of them station according to equipment of the present invention and method.
Fig. 1 illustrates the representative network of using embodiments of the invention.As shown in Figure 1, access point (AP) 2 is coupled to a plurality of mobile radio stations (STAi) 10, and described mobile radio station (STAi) 10 communicates with one another via Radio Link and communicate by letter with described AP.Key principle of the present invention is not consider receiver performance and channel behavior, and the frame error probability depends on signal to noise ratio (snr), its transmission rate and the length thereof at receiver.On an average, sending STA can be by grasping from relatively estimating path loss and channel behavior by receiving the measured RSS of frame that STA sent.Notice that in typical IEEE 802.11 STA implementations, RSS can be used for medium access control (MAC) agreement.Thereby, all uses the transmission power level fixed for it all transmission as long as receive STA, so just can use the variation of RSS to be provided for producing and upgrade transmission-rate reference to be used for subsequently transmission frame so that make the mechanism that frame is just in time sent with correct transmission rate.
With reference to Fig. 2, the AP in the WLAN of Fig. 1 and each STA can comprise the system with illustrated architecture in the block diagram of Fig. 2.AP and STA can comprise receiver 12, demodulator 14, power-measuring circuit 16, memory 18, processor controls 20, timer 22, modulator 24 and transmitter 26.Although this description may relate to the term that is generally used for describing specific mobile radio station, yet this description and principle are equally applicable to other treatment system, comprise the system that has with in different architecture shown in Fig. 2.It is microprocessor, central processing unit, computer, circuit card, application-specific integrated circuit (ASIC) (application-specificintegrated circuit ASIC) that processor 20 can be represented.Memory 18 can be represented promptly based on the optics of dish or the part or the combination of magnetic cell, electronic memory and these and other memory device.Yet can replace in other embodiments, or use hardware to be used to realize the present invention in conjunction with software instruction.
In the operation, receiver 12 and transmitter 26 are coupled to the antenna (not shown), send into the corresponding digital data via demodulator 14 signal that 24 conversions are received with modulator and the data of being wanted respectively.Power-measuring circuit 16 is operated under the control of processor 20 so that detect the RSS of institute's received frame on it.Estimated and be stored in the memory 18 about the RSS at other station, described memory 18 is coupled to processor 20 and obtains subsequently being used for.Be updated and be used to produce master meter after a while about the RSS of the estimation at other station in the identical BSS, described master meter is used to select correct transmission rate.Timer 22 is used for eliminating expired RSS estimation, and it is stored in the memory 18.In this embodiment, when trending towards potential mobility owing to the time variation matter of wireless channel and WLAN STA and cause changing, upgrade RSS along with RSS.
For instance, Fig. 3 represents to be used to select the transmission master meter of suitable transmission rate.When transmission STA transmission has the frame of length-specific and receives corresponding confirmation signal, send STA and produce or upgrade threshold boundaries to be used for transmission frame subsequently according to measured RSS in master meter.In case be that different frame each (that is, 0-100 byte, 100-1000 byte and 1000-2400 byte) at interval set up the RSS threshold boundaries, send STA so and revise transmission rate from receiving the measured RSS of STA institute's received frame according to it.Notice that the variation of RSS shows that the condition of Radio Link between transmission STA and reception STA changes.As shown in Figure 3, each threshold boundaries shows which is to be the desired minimum RSS value of specific transmission PHY speed.For example, if one is monitoring that the STA that comes from by the RSS that receives the frame that STA sent detects described RSS and becoming and be lower than one of threshold value (promptly, because the distance that increases between reception STA and transmission STA causes), next transmission attempt may be to carry out so that guarantee received frame correctly than low rate so.
Be employed variable list in Fig. 3-4 below:
| I | The subscript of data rate | F: speed=1,2,5.5,11} (Mbps)=and 1,2,3,4} |
| J | The subscript of frame length | G: length j={0-100,100-1000,1000-2400} (bytes)=1,2,3} |
| LA_th [i，j] | The link circuit self-adapting rate-valve value | 0＜I＜5&0＜j＜4 |
| RSS | The signal length that receives is measured recently | |
| RSS_avg | The average received signal length |
In brief, the frame length interval, j={1,2,3} represents different frame signs respectively: 0-100 byte, 100-1000 byte and 1000-2400 byte.Data rate i={1,2,3,4} is illustrated in one of four available data rate in this example, described four data speed promptly 1,2,5.5 and 11Mbps.For each defines the RSS threshold value at interval.Threshold value " LA_th[i, j] " represent to be worth with the minimum " RSS_avg or RSS threshold value " of data rate " i " transmit frame in length interval " j ".
Fig. 4 illustrate be used for distinguishing (1) because wrong and (2) that the channel condition of difference (such as distance), decay and high path loss are caused because disturb and mistake that conflict is caused in order to the overall operation of the transmission rate of adjusting wireless network.
Usually, mobile unit is configured to operation (step 100) in two patterns: (1) receiving mode; (2) sending mode.STA sends request signal so that send data, selects transmission rate according to average (RSS_avg) threshold value of RSS, frame sign and number of retransmission attempts then.Here, when carrying out modifying rates from the measured average RSS of the frame that receives during by some threshold values the master meter, described master meter comprises the desired minimum RSS value of specific transmission rate.After this, STA comes transmit frame with selected transmission rate.Depend on whether transmission is successful, and STA upgrades corresponding " threshold value " in the master meter.Thereby STA attempts selecting transmission rate according to RSS_avg, frame length and repeating transmission.Notice that this block diagram illustrates at 802.11 STA according to the operation of the Basic Service Set among Fig. 4, sends or therefrom receive all frames to its AP all the time in this case.Thereby mentioned here reception STA is its AP all the time.
When transmission STA transmission had the frame of length-specific, it received corresponding confirmation signal (that is, confirming (ACK) frame).When the confirmation of receipt signal, it shows that transmission rate is suitable.If do not receive the confirmation signal in the given time, occur the overtime condition of confirmation signal (step 102) so.Under overtime condition, determine that in step 104 whether described mistake is caused by the performance (for example RSS is too low) of receiver.If be false, determine that so wrong reason for example is interference, conflict, multipath etc.For example, overtime condition (step 102) occurring afterwards, determining in step 104 whether the variation of received signal intensity (RSS) in scheduled time slot has surpassed a certain RSS threshold value.
Can calculate RSS over time according to following equation, perhaps Δ RSS:
ΔRSS＝RSS_avg-RSS_actual。
In the determining of step 104, along with the variation during the specific period of RSS increases, owing to also can increase at the too low probability of mistake that causes of the RSS of receiver.In addition, it shows that described mistake occurs owing to the performance (PER) of receiver and owing to causes in the low-power of receiver.Thereby, increase RSS threshold value/link circuit self-adapting rate-valve value (LA_th[i] [j]) in step 108, then in step 106 retransmit frames.If step 104 determine show RSS during the specific period not or very little variation (for example when comparing with predetermined threshold) arranged, so owing in the conflict of receiver or mistake appears in interference and channel condition can be very not high by the probability of variation.Thereby, under the situation that in link circuit self-adapting rate-valve value (LA_th[i] [j]), does not have to change, in step 106 retransmit frames.Should be noted that and utilize each the repeating transmission, collision probability is lower, thereby those skilled in the art can determine various different retransmission threshold rates for various different conditions.
As can be seen from the above, the present invention just just increases the RSS threshold value in the mistake relevant with channel (for example not upgrading in conflict or after disturbing) afterwards owing to be different from prior art.Just (after the grouping at predetermined number) just revises transmission rate after the associated change of RSS or very long interference.In addition, the present invention can select suitable transmission rate under the situation of current IEEE 802.11 WLAN medium access control standards not being made any change.
Though illustrated and described the preferred embodiments of the present invention, yet it will be appreciated by those skilled in the art that and under the situation that does not break away from true scope of the present invention, to make various changes and modification and can replace its element with equivalent.In addition, under the situation of off center scope not, can make many modifications so that be suitable for particular case of the present invention and instruction.Therefore, the invention is intended to be not limited to be reserved as realize the disclosed specific embodiment of best mode of the present invention, but the present invention includes all embodiment that fall in the claims scope.
Claims (10)
1. method that is used for error differentiating between two mobile radio stations of wireless network, described method comprises step:
Detect the overtime condition of transmission of transmit frame;
Use comes from received signal intensity (RSS) value of a plurality of incoming frames that received by described mobile radio station and determines whether the error of transmission that is associated with described overtime condition is caused by channel condition.
2. the method for claim 1, wherein step (a) further comprises step: from being measured average received signal strength (RSS_avg) value by a plurality of incoming frames that described mobile radio station received, and determine whether the variation of described received signal intensity in scheduled time slot has surpassed predetermined value.
3. the method for claim 1 is wherein calculated RSS over time according to following equation, Δ RSS:
ΔRSS＝RSS_avg-RSS
Wherein RSS represents current received signal intensity.
4. the method for claim 1 wherein sends described incoming frame by access point (AP).
5. the method for claim 1, wherein said incoming frame is sent by another mobile radio station.
6. mobile radio station that is used for error differentiating between two mobile radio stations of wireless network, described station comprises:
Acceptor circuit is used for the demodulation incoming frame;
Power-measuring circuit, the received signal intensity (RSS) of the incoming frame that is used to measure wherein and is received;
Be coupled to the processor of described power-measuring circuit, be used for determining the overtime condition of transmission of transmit frame and received signal intensity (RSS) value that use comes from a plurality of incoming frames that received by described mobile radio station come definite error of transmission that is associated with described overtime condition whether to be caused by channel condition.
7. mobile radio station as claimed in claim 10, wherein processor further comprises according to being determined average received signal strength (RSS_avg) value by a plurality of incoming frames that described mobile radio station received and determining whether the variation of described received signal intensity in scheduled time slot has surpassed predetermined value.
8. mobile radio station as claimed in claim 14, wherein calculate RSS over time according to following equation:
ΔRSS＝RSS_avg-RSS
Wherein RSS represents current received signal intensity.
9. mobile radio station as claimed in claim 10 wherein sends described incoming frame by access point (AP).
10. mobile radio station as claimed in claim 10, wherein said incoming frame is sent by another mobile radio station.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60562204P | 2004-08-30 | 2004-08-30 | |
| US60/605,622 | 2004-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101010914A true CN101010914A (en) | 2007-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800293016A Pending CN101010914A (en) | 2004-08-30 | 2005-08-24 | A method and system for error differentiating in wireless networks |
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| Country | Link |
|---|---|
| EP (1) | EP1787431A1 (en) |
| JP (1) | JP2008512025A (en) |
| KR (1) | KR20070047316A (en) |
| CN (1) | CN101010914A (en) |
| WO (1) | WO2006024994A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105027484A (en) * | 2013-02-25 | 2015-11-04 | 高通股份有限公司 | Indicating whether data was subjected to interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4020458B2 (en) | 1997-06-19 | 2007-12-12 | 三菱電機株式会社 | Wireless communication system, data transmitter and data receiver |
| US8255756B2 (en) * | 2006-07-27 | 2012-08-28 | Panasonic Corporation | Wireless communication apparatus, wireless LAN system, interference detecting method, and interference avoidance method |
| EP2247042A1 (en) * | 2009-04-28 | 2010-11-03 | Thomson Licensing, Inc. | Device and method for computation of channel loss rate and collision loss rate of communication link(s) in a random access network |
| US8630197B2 (en) | 2010-09-23 | 2014-01-14 | Motorola Solutions, Inc. | Method for determining data rate and packet length in mobile wireless networks |
| WO2012110442A1 (en) * | 2011-02-14 | 2012-08-23 | Thomson Licensing | Troubleshooting wi-fi connectivity by measuring the round trip time of packets sent with different modulation rates |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7095719B1 (en) * | 2000-06-20 | 2006-08-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for dynamic packet selection in uncoordinated radio systems |
| US7046644B1 (en) * | 2000-11-27 | 2006-05-16 | Nokia Mobile Phones Ltd. | Adaptive transmission channel allocation method and system for ISM and unlicensed frequency bands |
| US7336634B2 (en) * | 2002-07-25 | 2008-02-26 | Koninklijke Philips Electronics N.V. | Method and system for generating and updating transmission rate for link adaptation in IEEE 802.11 WLAN |
| CN100518361C (en) * | 2003-02-12 | 2009-07-22 | 捷讯研究有限公司 | Apparatus, and associated method for facilitating initiation of channel allocation to communicate data |
-
2005
- 2005-08-24 KR KR1020077004343A patent/KR20070047316A/en not_active Withdrawn
- 2005-08-24 CN CNA2005800293016A patent/CN101010914A/en active Pending
- 2005-08-24 JP JP2007529093A patent/JP2008512025A/en not_active Withdrawn
- 2005-08-24 WO PCT/IB2005/052777 patent/WO2006024994A1/en not_active Application Discontinuation
- 2005-08-24 EP EP05781239A patent/EP1787431A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105027484A (en) * | 2013-02-25 | 2015-11-04 | 高通股份有限公司 | Indicating whether data was subjected to interference |
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| Publication number | Publication date |
|---|---|
| KR20070047316A (en) | 2007-05-04 |
| WO2006024994A1 (en) | 2006-03-09 |
| JP2008512025A (en) | 2008-04-17 |
| EP1787431A1 (en) | 2007-05-23 |
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