CN1910844A - Method and apparatus for network management using perceived signal to noise and interference indicator - Google Patents
Method and apparatus for network management using perceived signal to noise and interference indicator Download PDFInfo
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- CN1910844A CN1910844A CNA2004800021765A CN200480002176A CN1910844A CN 1910844 A CN1910844 A CN 1910844A CN A2004800021765 A CNA2004800021765 A CN A2004800021765A CN 200480002176 A CN200480002176 A CN 200480002176A CN 1910844 A CN1910844 A CN 1910844A
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Abstract
Method and apparatus of network management using a perceived signal to noise indicator (PSNI), in preference to received signal strength indicator to provide physical layer measurements in a multitude of stations in the network, either by way of radio frequency power, or observed signal to noise plus interference from each access point, to report the measurements, to collect the measurements, and using the reported PSNI values as a signal quality indicator of delivered bit error rate or frame error rate to evaluate, reconfigure, and manage multiple stations in order to optimize the network or network performance.
Description
Technical field
The relevant general networking management of the present invention refers to use an observation signal parameter that obtains at a receiving terminal to make things convenient for network management especially, and wherein this parameter is as the indicating device (PSNI) of a perceptual signal to noise (and interference).
Background technology
This part specification comprises following english abbreviation:
AP access point (access point)
BER bit error rate (bit error rate)
CCK mutual-complementing code shift key (complementary code keying)
The exhibition of DSSS direct sequence is (direct sequence spread spectrum) frequently
EIRP equivalent isotropically radiated power (equivalent isotropically radiated power)
ERP Effective Radiated Power (effective radiated power)
FEC forward error correction (forward error correction)
FER frame error ratio (frame error rate)
MIB management database (management information base)
The OFDM orthogonal frequency is multiple to be cut apart (orthogonal frequency division multiplexing)
The PBCC package binary system coding (packet binary convolutional coding) that circles round
PHY physical layer (physical layer)
PLCP physical layer conversion communications protocol (physical layer conversion protocol)
PMD tangible media interdependent (physical medium dependent)
PPDU PLCP communications protocol data cell (PLCP protocol data unit)
PSK phase-shifted key (phase shift keying)
The PSNI perceptual signal is to noise indication (perceived signal to noise indication)
RPI received power indicating device (received power indicator)
RSSI received signal volume indicator (received signal strength indicator)
SQ signal quality (signal quality)
STA base station (station)
Ieee standard 802.11 is now granted provides interface, measurement and step to support the function of the higher level of active block management.At present, 802.11 standards have defined many physical parameters, wherein the purpose of managing without any a complete suitable networks.But the example of one of them measurement parameters is received signal volume indicator (RSSI), and it is reportable parameter for each received frame but does not show in this standard, and does not clearly stipulate completely.This standard comprises some definition in view of RSSI, but it keeps some restriction that RSSI causes in the use of network management, because may uniformly not define from the RSSI parameter of different base stations (STAs), therefore can not compare.
But the measurement parameters of second suggestion is signal quality (SQ), and it also is the non-quantification indicating device of a code synchronism just, but only is applicable to DSSS PHY modulation and is not suitable for OFDM PHY modulation.But another measurement parameters is the RPI histogram, even it is quantized or indicates, all can not do target and measure on any bridger.The RPI histogram comprises 802.11 resources, radar and all other interference sources from all resources and measures channel power, and it does not have help for relying on this RPI histogram as a Control Parameter.
Present standard mainly defines the indication of received signal intensity based on the measurement of AP signal:
(1) on identical channel, identical physical layer and identical base station; With
(2) on different channels, identical physical layer and identical base station.
Importantly, comprise the measurement of different physical layers and identical or different base station, even be required, all do not have at present in this standard, to propose.
Network Management needs comparative PHY to measure, as in the use of cutting off decision.Following form is that comparative PHY measures.
1. compare the AP signal on same channel, the identical PHY in identical STA.
2. compare the AP signal on same channel, the identical PHY in different STAs.
3. compare the AP signal on different channel, the identical PHY in identical STA.
4. compare the AP signal on different channel, the identical PHY in different STAs.
5. compare the AP signal on the different PHYs in different STAs.
6. compare the AP signal on the different PHYs in identical STA.
In the cut-out decision of comparative measurement to network management is very important.
RSSI as defined at present, only provides mentioned kind (1) and (3).RSSI is a kind of measurement of the RF energy that is received by DSSSPHY or OFDM PHY.The RSSI indication provides eight at the most (256 stratum).The permissible value scope of RSSI is from zero maximum to RSSI.This parameter is that a less important layer by the PHY of energy is measured, its this energy be used for receiving on the antenna of present PPDU viewed.RSSI is measured in the reception period of PLCP leading (preamble).RSSI attempts to use with a relative mode, and it is the monotonically increasing function (monotonically increasing function) of a received power.
CCK, ER-PBCC: as in 18.4.5.11, describing the RSSI of eight-digit number value.
ERP-OFDM, DSSS-OFDM are as the maximum of this number range of eight from zero to RSSI of describing in 17.2.3.2.
Some of RSSI indicating device are restricted to: RSSI is dullness, a relative power indicating device on antenna connector, and it is the summation that indication requires signal, noise and interference power.In high-interference environment, RSSI is not a suitable signal quality indicating device that requires.RSSI does not intactly indicate: do not have the unit definition and do not have performance requirement (accuracy, fidelity, testability).Therefore because relevant RSSI appointment is so few, carries out variation widely and must be thought and exist.Can not remove the RSSI of comparison different product and perhaps even can not remove different channel/frequency range in the comparison like products.
Although RSSI for restriction to some extent in the use of estimation AP option, does not use on more different PHYs in a known PHY.RSSI must measure for DSSS and OFDM PHYs again.RSSI is useless in the load balance of network management and load displacement clearly, and the RSSI of a base station is incoherent with the RSSI of any other base station really.
Summary of the invention
The invention provides one and use a signal parameter, it is the network management (PSNI) of perceptual signal to the noise indication; And not using RSSI, the latter has many serious restrictions in indication.Preferably, but not necessarily, for example the permissible value of this PSNI parameter may be 0 to 255.
Description of drawings
This case is more understood in depth in order to do getting one by following various preferred embodiment icons and detailed description:
Fig. 1 is the option that PHY of the present invention measures;
Fig. 1 a is the techniqueflow chart that acquisition one of the present invention inputs to the fec decoder device;
Fig. 2 is the PSNI in the appointment of BER curve; And
Fig. 3 is a PSNI explanation point example.
Embodiment
The method of a network management need be provided, consider under all different situations, to comprise the comparative measurement of AP signal in different physical layers and the identical or different base station.
What describe afterwards is a specific demodulator, is indicated the subjectivity estimation device of the perception S/ (N+I) of appointment by the FER of a quantification.In the following description that is recorded in embodiment.
All digital demodulator uses tracking loop and complicated last handling process to come the symbol of demodulate reception.The demodulator parameter of many inside is proportional to the S/ (N+I) of perception.Some examples are:
PSK: fundamental frequency phase jitter, fundamental frequency error vector value (EVM)
DSSS: spreading codes correction quality
OFDM: frequency tracking and channel are followed the trail of stability
The demodulator inner parameter is available under the basis of framework one by one.The demodulator parameter that is proportional to simulation S/ (N+I) is constant on about data rate.Identical parameter can be used on any data rate.
The demodulator inner parameter is can be in the environment of a control designated and proofread and correct, and it controls environment with relevant in the actual FER performance of two above operating points that defined by speed, modulation and FEC.Such demodulator inner parameter is estimation FER performance under the environment of interference and noiseless (having only noise), and can be used as the standard of PSNI.As a useful PSNI indicating device, do not need to indicate the standard which demodulator inner parameter is used as this demodulator, the indicating device that only needs this quantification of explanation is that how to be relevant to FER just enough.
Notice that following item is relevant with the invention use for PSNI in the network management:
It is one eight nothing number (unsigned) values that PSNI is designated as RSSI, and its dullness with increase S/ (N+I) increases.
PSNI is that logarithm amplifies for perception S/ (N+I).PSNI builds on a demodulator inner parameter that the quick estimation device of FER is provided.
Appointment is defined by two signal quality points across the output of the PSNI in scope indication: the first o'clock level of quality a minimum useful signal, the second o'clock level of quality at a maximum available signal.
At least two FER points are specified the accuracy of output valves and output valve, and to each effective modulation, FEC and data rate in conjunction with specifying a FER point.
The part that the PSNI scope is lower than 40db in may the opereating specification across S/ (N+I) is with the high FERs of cover data rate from 1 to 54Mbps, but can use higher or lower range distance.
The PSNI indicating device is a perception in demodulator, the post-processed signal measurement to noise and interference (S/ (N+I)) ratio.For perceptual signal to noise indicating device (PSNI) parameter permissible value scope from 0 to 255 (i.e. eight binary digits).This parameter is measured by the less important layer of PHY in the observed afterwards perceptual signal quality of RF down converted (downconversion), and is known by inference by a demodulator internal digital signal processing parameter that is used for receiving present frame.PSNI is measuring at the leading of PLCP with on whole received frames.PSNI attempts to use with a relative method, and it is the dullness increase logarithmic function of the S/ (N+I) of an observation.PSNI accuracy and scope are specified in the minimum value of two different FER operational circumstances.Fig. 3 provides example explanation point for the scope that PSNI is amplified to a 43dB.
Fig. 1 represents the option that PHY measures, and it can be used as a PSNI indicating device.With reference to the receiving system 10 of figure 1, following consensus is effective to the vast scope of present modulation and coding techniques.The signal of ordering at A and B is to noise ratio is identical in theory but actual capabilities are slightly different, because in the increase loss of radio-frequency front-end (radiofront end) 12.Signal noise ratio after the analog-to-digital on A/D converter 14 is also identical in theory, and the increase of trace is arranged on the noise about quantization error.
Therefore in a high performance system, in the jam-to-signal of an A be input between the jam-to-signal of demodulator 16 and tracking loop and have only a small difference.In the system of simple and low usefulness, the jam-to-signal of some A and be input between the jam-to-signal of demodulator 16 and have an evident difference.The jam-to-signal of (some C) can not directly be observed by bit error rate (BER) in the output of demodulator 16.According to a demodulator performance curve that is used for causing the actual demodulation device to carry out loss, at the BER of a C with relevant in the signal noise ratio of a B.
In the same manner, be used for producing actual fec decoder device according to one and carry out the fec decoder device performance curve that loses, relevant in the output of fec decoder device 18 (some D) with the input of fec decoder device.Frame error ratio (FER) in the some E of frame inspection function 20 is a direct mathematical function of adding up in BER and the Fault Distribution of a D.Loss of carrying out and frame inspection generally directly do not concern.In general, for lower BERs, FEC equals the position size that BER multiply by frame.
Frame inspection function 20 at Fig. 1 receiving system 10 can be finished with a frame synchronization inspection.In most practical design, each frame comprises a sync check, and whether this block of its indication (with high reliability) is by correct reception.Most of general parity check is that a cyclic redundancy code detects (CRC, Cyclic Redundancy Checking), but other technology also is possible and to be acceptable.If do not use the frame synchronization inspection, then estimate FER with the BER that obtains in the function by fec decoder device 18.Can finish with a known method by the BER that obtains in these fec decoder device 18 functions input, make a summary following (see Fig. 1 a):
The output of fec decoder device generally is correct.Therefore, obtain and write down this output (step S1 and S2).The coding rule of FEC be used for creating the model (step S3) of a correct input position and each with corresponding in fact input to the fec decoder device and write down compare (step S4).Each relatively increases a count value (step S5).Each does not conform to the input bit-errors (step S7) that (step S6) represents an accumulative total.The BER that obtains (step S9 and S10) can remove to estimate observed FER (step S11) with the actual performance curve of this fec decoder device then.This relatively (whether wrong-step S6) last till a count value N arrive till (step S8), this moment, the count value at step S7 was regarded as BER (step S9).
In this method, use the execution loss of reality to allow a kind of method of closing the signal noise measurement of linking on other aspect that signal noise on any point is measured with the theoretical performance curve.
From the viewpoint of a network management, the signal quality that is sent to the user is preferably represented by actual FER or observed FER (some E).The notion of PSNI provides the directly observation FER of the whole STAs of connection, and no matter the different execution loss of each STA.This can be finished by following: 1) based in the measurement of an inner demodulator parameter, 2) specify relevant on the speed/demodulator/FEC binding site of special data the PSNI indicating device numerical value of observed FER, and 3) measurement of adjusting inner demodulator parameter explains the actual fec decoder device loss that transmission (downstream) downwards takes place from measuring point.Because use the measuring point of a demodulator inside, the signal quality of measurement has comprised the front end loss effect of STA.Owing to specify PSNI indicating device, in the loss of actual demodulation device has been included in about observed FER.Because the measurement of adjusting this demodulator to be producing the loss of actual FEC demodulator, so all STA fec decoder device that may use can keep the validity of this indicating device.
Because PSNI builds on the inner demodulator parameter, so can measure and repayment on (frame-by-frame) basis frame by frame at one.BER on a C or E or FER measure needs many accurately frames of measurement that are used for.Therefore, PSNI is that a reality, quick and available observation signal quality refer to not device.
Can the rapid measuring analog signal on an A or some B to the ratio of noise, yet owing to also do not know the losses all carried out even the summation of transmission downwards, they can not close the observation FER that links an E exactly.
In these methods, the invention of the PSNI of network management use be can more effective execution, more rapid measuring, the information that do not need STA to carry out, therefore here other is an improvement on discussing.
Fig. 2 represents the PSNI of BER curve of the present invention appointment.Fig. 3 represents that PSNI is amplified to the illustrative example point of a 43dB scope.
The advantage of PSNI on RSSI comprises following: the definition of PSNI meets the needs of RSSI, and wherein this PSNI is one eight nothing number value (for DSSS PHYs) and is proportional to received signal power.PSNI can repay in the block of any RSSI of being called, makes this PSNI indicating device can be fit to internal layer frame quality measurements widely.PSNI MIB input value and repayment/announcement can further obtain to authorize in 802.11 and make the improvement of this PSNI applicable to more high-rise frame.
Before be the description of a PSNI indicating device embodiment and network management, this invention is designed to be applicable to that all transmission modes comprise TDD, FDD, CDMA and other pattern without exception.Described PSNI indicating device is also identical with the method with reasonable modification to be susceptible to.Therefore all similar modifications and variations all are taken into account in the field of the present application.
Claims (43)
1. a method that determines a perceptual signal to noise indication (PSNI) is used for the management of a wireless network, and its step comprises:
This PSNI is based upon on the parameter, and it is to obtain by measuring a resulting signal on a given place of a receiving system; And
Specify a PSNI indicated value, it is relevant with a frame error ratio (FER) that obtains at this receiving system.
2. the method for claim 1 is characterized in that also comprising:
This PSNI parameter as one of them a signal quality indicating device of a bit error rate (BER) and a frame error ratio (FER), is reconfigured and manages this network performance of optimization with what promote this network.
3. the method for claim 1 is characterized in that also comprising:
Adjust this parameter to produce decoder loss about a FER decoder downstream of this measuring point.
4. the method for claim 1 is characterized in that also comprising:
Adjust this parameter to produce the downstream losses of relevant this measuring point.
5. method as claimed in claim 4, it is characterized in that this parameter be in the demodulator from this receiving system obtain.
6. method as claimed in claim 4 is characterized in that this parameter is constant on data rate.
7. method as claimed in claim 4, it is characterized in that this parameter be a fundamental frequency phase jitter and a fundamental frequency error vector value one of them.
8. method as claimed in claim 4 is characterized in that this parameter is a spreading codes correction quality.
9. the method for claim 1 is characterized in that also comprising:
The measurement of acquisition in an output of a reception antenna of this receiving system.
10. the method for claim 1 is characterized in that this parameter is that a frequency tracking and a channel are followed the trail of one of them of stability.
11. the method for claim 1 is characterized in that specifying this step of PSNI value also to comprise:
Specify this PSNI indicating device numerical value, it is relevant to this FER that acquires at least one specific data rate/demodulator/forward error correction (FEC) binding site.
12. the method for claim 1 is characterized in that also comprising the measurement on the internal point that the demodulator that provided is provided in this receiving system.
13. the method for claim 1 is characterized in that an output that also is included in a wireless front end upward obtains this measuring point, wherein this wireless front end is the some of this receiving system.
14. the method for claim 1 is characterized in that also comprising the measurement in the output of the demodulator that acquisition provided in this receiving system.
15. the method for claim 1 is characterized in that this PSNI and a perceptual signal are to be the logarithmic scale relation to the noise-plus-interference value.
16. a method that is used for managing wireless network, its step comprises:
Determine a perceptual signal to noise indication (PSNI), it is to measure a signal by the access point (AP) on a receiving position, and wherein a signal is a parameter that depends on this measurement signal to noise-plus-interference value (S/N+I); And
Adjust this parameter to compensate the downstream losses of relevant this access point.
17. method as claimed in claim 16 is characterized in that this signal is measured on an AP of a demodulator of this receiving position.
18. method as claimed in claim 16 is characterized in that this signal is measured on an AP of a receiver of this receiving position.
19. method as claimed in claim 16 is characterized in that also comprising:
Changing this signal is a fundamental frequency; And
Provide an automatic gain to be controlled to this fundamental frequency signal, so that fundamental frequency power remains unchanged.
20. method as claimed in claim 19, it is characterized in that this PSNI obtains after reception, analog-to-digital and the demodulation of this signal physical layer (PHY), its this signal physical layer be specific to and directly relevant with the observer frame error rate that obtains from a forward error correction (FEC) decoder.
21. method as claimed in claim 20 is characterized in that a frame error ratio (FER) is to check the cyclic redundancy code detection (CRC) from a frame to obtain.
22. a device that is used for managing wireless network, it comprises:
One determination device, in order to determine a perceptual signal to noise indication (PSNI), it is to measure a signal by going up at an access point (AP), wherein this PSNI depends on a parameter of this resultant signal on this AP; And
One adjusting device is in order to adjust this parameter to produce the decoder downstream losses of relevant this measuring point.
23. device as claimed in claim 22 is characterized in that also comprising a connection device, is connected to a downstream that obtains about the frame error ratio (FER) of this AP in order to this PSNI value is closed.
24. device as claimed in claim 23 is characterized in that this connection device also comprises:
One specified device, in order to specify this PSNI value, it is relevant to this FER that acquires at least one specific data rate/demodulator/forward error correction (FEC) binding site.
25. device as claimed in claim 22 is characterized in that this AP is an internal point of the demodulator that provided in a receiver.
26. device as claimed in claim 25 is characterized in that this AP is positioned in the output of a reception antenna, in order to transmit a received signal to this receiver.
27. device as claimed in claim 25 is characterized in that this AP is positioned in the output of a wireless front end, this wireless front end is the some of this receiver.
28. device as claimed in claim 25 is characterized in that this AP is positioned in the output, this output is a demodulator of this receiver.
29. device as claimed in claim 22 is characterized in that this PSNI and a perceptual signal are to be the logarithmic scale relation to the noise-plus-interference value.
30. a device that is used for managing wireless network, it comprises:
One determination device, in order to determine a perceptual signal to noise indication (PSNI), it is to go up by the access point (AP) on a receiving position to measure a signal, and wherein a signal is by a parameter that receives this signal in this signal at a demodulator to noise-plus-interference value (S/N+I); And
One first adjusting device is in order to adjust this parameter to produce the downstream losses of relevant this demodulator.
31. device as claimed in claim 30 is characterized in that also comprising:
One conversion equipment is a fundamental frequency in order to change this signal; And
One generator is constant to keep fundamental frequency power in order to provide an automatic gain to be controlled to this fundamental frequency signal.
32. device as claimed in claim 31 it is characterized in that this AP reaches a receiver, a right/digital quantizer of simulation and a demodulator under being, and it is directly relevant with an observer frame error rate that obtains from a forward error correction (FEC) decoder.
33. device as claimed in claim 32 is characterized in that a frame error ratio (FER) is to be obtained by the device that uses a frame cyclic redundancy code to detect (CRC).
34. device as claimed in claim 30 is characterized in that this adjusting device also comprises:
One second adjusting device, in order to adjust this parameter to produce the loss of forward error correction decoder, it is relevant to the downstream of this demodulator.
35. device as claimed in claim 30 is characterized in that also comprising:
One forward error correction (FEC) decoder;
One generation device inputs to the repetition that one of this decoder is correctly imported the position in order to generation;
One comparison means is in order to relatively to have this generation input position of a corresponding position that inputs to this decoder, to determine a bit error rate (BER); And
One responding device is in order to respond the method for this BER and fec decoder device output, in order to estimate a frame error ratio (FER).
36. device as claimed in claim 30, it is characterized in that this parameter be a fundamental frequency phase jitter and a fundamental frequency error vector value one of them.
37. device as claimed in claim 30 is characterized in that this parameter is a spreading codes correction quality.
38. device as claimed in claim 30 is characterized in that this parameter is that a frequency tracking and a channel are followed the trail of one of them of stability.
39. device as claimed in claim 30 is characterized in that also comprising:
One device is indicated as one of them a signal quality of a bit error rate (BER) and a frame error ratio (FER) in order to use a PSNI who obtains, and to promote reconfiguring and managing of this network, comes the optimization network performance.
40. device as claimed in claim 30 is characterized in that this AP is an internal point of the demodulator that provided in a receiver.
41. device as claimed in claim 30 is characterized in that this AP is positioned in the output of a reception antenna, in order to transmit a received signal to this receiving system.
42. device as claimed in claim 30 is characterized in that this AP is positioned in the output of a wireless front end, this wireless front end is the some of this receiver.
43. device as claimed in claim 30 is characterized in that this AP is in the output that is positioned at for a demodulator of this receiving system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105161115A (en) * | 2011-04-11 | 2015-12-16 | 三星电子株式会社 | Frame erasure concealment for a multi-rate speech and audio codec |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105161115A (en) * | 2011-04-11 | 2015-12-16 | 三星电子株式会社 | Frame erasure concealment for a multi-rate speech and audio codec |
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