CN101517994A - Methods and apparatus for determining quality of service in a communication system - Google Patents

Abstract

The invention discloses methods and apparatus for determining the quality of service of a network. The disclosed method for determining quality of service for a network includes determining at least two metrics reflective of network parameters in at least two different protocol layers of the communication network. The metrics are then compared with respective threshold values, and quality of service for the network is determined based on the comparison of the metrics with the respective threshold values.The invention also discloses corresponding apparatus for executing the method.

Description

The method and apparatus that is used for the service quality of definite communication system

Require priority according to 35U.S.C. § 119

Present patent application require to enjoy submit on September 28th, 2006, exercise question is respectively the provisional application No.60/848 of " HandoffTriggers for WLAN and VoWLAN ", " Estimation of the Path Quality to AssistHandoff Decision ", " Handoff Algorithms for VoIP over WLAN ", 414, No.60/848,415 and No.60/945,054 priority, these provisional application have transferred the application's assignee, so incorporate the application into way of reference clearly.

Technical field

Put it briefly, the present invention relates to be used for determining the method for quality and the device of network, specifically, relate to specific local network (LAN) and being used to of being associated (are for example sent speech data, the service quality (QoS) of network backhaul link ip voice) is determined, thereby for example under the situation of the special parameter that does not satisfy QoS, carry out and correct operation, to improve QoS.

Background technology

In communication system, the application of Internet protocol (IP) phone such as end-to-end IP voice (VoIP) are called out is more and more general.Route in this voip call between related a plurality of end points adopts any or several combinations in the multiple different communication network technology to insert IP network (for example, the Internet) usually.Employed types of network technologies comprises, for example: and wireless lan (wlan), such as Wi-Fi (ieee standard 802.11) and Femto cell (femtocells); Wireless wide area network (WWAN) comprises that (for example, 1X-EVDO), high-speed packet inserts (HSPA) and other WWAN to cellular network, such as WiMAX (IEEE 802.16); And other various network technologies known He to be defined.Therefore, can in a plurality of networks, exchange the VoIP business by the route between a plurality of end points.For example, among the user A and the end-to-end voip call between the user B in the environment of residential area, the VoIP grouping can travel through the Wi-Fi access network of user A, DSL or cable broadband, IP kernel heart net, the DSL of user B or the Wi-Fi access network of cable broadband and user B of user A potentially.Self-explantory is that owing to will use a plurality of networks transmission of voice packets between a plurality of end points, the overall quality of service that the service quality fault all can influence this calling appears in any one network link in these network links.

Therefore, as everyone knows, need to determine service quality (QoS) tolerance of communication link, and and then utilize determined QoS to operate, (for example to improve this QoS, switch to another communication link by triggering end-equipment from the communication link that QoS descends, so that keep the continuity of audio call).In such system, because descending, the QoS that is taken place Anywhere in being used for sending a plurality of particular networks of calling all can influence the equipment at audio call end points place, so monitor QoS by a method, apparatus or both sides' equipment (for example, mobile phone or computer) at audio call end points place usually.

One known is used for determining that at wireless lan (wlan) the tolerance of QoS is determining or measure the received signal power on from WAP (wireless access point) (AP) to the down link of the communication equipment that is wirelessly connected to this AP.Therefore, if received signal power is lower than threshold value, end-equipment can (for example) triggers the switching to another network (for example, wireless wide area network (WWAN) or another available WLAN (wireless local area network)).Yet physics (PHY) depth amount self can not be determined the overall path quality of all situations and all layers effectively.For example, suppose that voip call carries out in wireless lan (wlan), although the downlink wireless signal strength signal intensity is enough to keeping high QoS, yet will the QoS of reality be had a negative impact at the packet loss at medium access control (MAC) layer or application layer place.In addition, even if the WLAN wireless signal strength is gratifying, but the decreased performance from the WLAN access point to the back haul link of calling out clearing end (call termination) equipment also can have a negative impact to QoS.In addition, access point possibly can't receive similar power level from communication equipment, and this can cause the link performance of down link good and the link performance of up link is poor, and equipment can't detect this point.Give an example, good WLAN quality need comprehensively be monitored each fault point (that is, each tolerance), in case and WLAN or the back haul link followed show failure symptom and just trigger switching to another wireless technology.Therefore, need a kind of mechanism, it can accurately be assessed according to the QoS of the various tolerance that influence call path to communication terminal, thereby supports optimization and fusion to user's optimal communication agreement, so that the seamless transmission between a plurality of networks and/or the agreement is provided.

Summary of the invention

According to an aspect, a kind of communications network service method for quality that is used for determining is disclosed.This method comprises: determine at least two tolerance of at least two different protocol layers in the communication network, wherein, described tolerance reflection network parameter; Described at least two tolerance and their threshold values are separately compared.This method also comprises: according to described at least two tolerance and their comparisons of threshold value separately, determine network service quality.

According to another aspect, a kind of communication equipment of operating in communication system is disclosed.This equipment comprises processor, and this processor comprises: first module, be used for determining at least two tolerance of at least two different protocol layers of described communication network, wherein, described tolerance reflection network parameter.This processor also comprises: second module is used for described at least two tolerance and their threshold values are separately compared; Three module is used for determining network service quality according to described at least two tolerance and their comparisons of threshold value separately.

According to another aspect, a kind of device that is used for determining communication link quality is disclosed.This device comprises: measures determining unit, is used for determining at least two tolerance of at least two different protocol layers of communication network, wherein, described tolerance reflection network parameter.This device also comprises: comparing unit is used for described at least two tolerance and their threshold values are separately compared; The quality determining unit is used for determining network service quality according to described at least two tolerance and their comparisons of threshold value separately.

According on the other hand, a kind of computer program product is disclosed, it has computer-readable medium.This computer-readable medium comprises: make computer determine the code of at least two tolerance of at least two different protocol layers in the described communication network, wherein, described tolerance reflection network parameter.This computer-readable medium also comprises: make the code that computer compares described at least two tolerance and their threshold values separately; Make computer according to described at least two tolerance and their comparisons of threshold value separately, determine the code of network service quality.

Description of drawings

Fig. 1 is the diagrammatic sketch of communication system, in this communication system, adopt quality determine and trigger action to improve service quality.

Fig. 2 shows the block diagram of several layers, and the quality on these layers in the executive communication system is determined or the tolerance monitoring.

Fig. 3 is the flow chart of method that is used for determining the communication link quality of communication system.

Fig. 4 shows and is used for determining the service quality of communication link and determines to carry out the exemplary means of correcting operation according to quality.

Embodiment

According to some aspect, disclose and be used for determining communication link quality and determine to trigger the method and apparatus of switching according to this.Quality is determined to comprise: the down link tolerance and the up link tolerance of monitoring two or more at least different agreement layers (for example, PHY layer, MAC layer or application layer).According to other aspect, determine to trigger switching between heterogeneous networks according to quality.

Fig. 1 is the diagram of example communication system 100, and communication system 100 service qualitys are determined and carried out thereupon and correct operation (for example, determining to switch according to quality), to improve quality.Just as will be described in detail, system 100 is used for setting up voip call between two end points (for example, two communication terminal or station).System 100 comprises local area network (LAN) 102 (for example, wireless lan (wlan) 102), and the latter moves according in the multiple wireless network standards (such as Wi-Fi (ieee standard 802.11)) any.Local area network (LAN) 102 comprises: WAP (wireless access point) (AP) 104, itself and a plurality of communication terminal end points (for example, mobile device 106 or comprise other electronic equipment of computer 108) communication.AP 104 also communicates by letter with back haul link 110.

Back haul link 110 comprises any in the multiple network connection type such as Digital Subscriber Line or cable broadband connect.Back haul link 110 is used for communication mode local area network (LAN) 102 being connected to wide area network (such as the Internet backbone 112).Particularly, back haul link stops 114 places, unit in the calling that communicates with the Internet backbone 112 and stops.The Internet backbone 112 is used for another terminal (not shown) of end-to-end link is mail in the VoIP grouping.

System 100 also comprises path quality monitoring function server 116, and the latter is used to assist definite for example terminal 106 and calls out the QoS that stops the communication link between the unit 114.Just as will be described in detail herein, path quality monitoring function (also being referred to as " PQMF " (acronym) in this article) can be by terminal or station (for example, mobile communication equipment 106) realizes, wherein, this terminal or stand on the network of VoIP in connecting mails to grouping information quality-monitoring server 116 (be positioned at the calling that is illustrated as frame of broken lines 117 and stop near the of unit or wherein).Give an example, as to coming the response packet of self terminal, quality-monitoring server 116 returns to terminal or station with grouping information, so that determine path quality.Submit to simultaneously with the application, attorney docket is that No.070018, application people have made more comprehensive description in the application common co-pending of " METHODS AND APPARATUS FORDETERMINING COMMUNICATION LINK QUALITY " to notion and the exemplary realization thereof of PQMF for Deshpande etc., exercise question, wherein, this co-pending application has transferred the application's assignee, so incorporate the application into way of reference clearly.

System 100 can also comprise the network that one or more confessions substitute, so that switch for communication terminal or station under the situation that the quality of WLAN 102 or back haul link 110 descends.For example, terminal 106 can switch to the WWAN network of 118 examples in base station.The WWAN network can be made up of any network in the multiple suitable network, for example cellular network comprises: CDMA, GSM, WiMax (IEEE 802.16), LTE, UMB, 1x-EVDO, UMTS, HSPA, network or any other suitable wireless or cable network.Base station 118 is mail to business (that is speech business) to call out by Internetwork link 112 and is stopped unit 114.

Another is another WLAN access point AP 122 (if it is in scope of communication terminal 106) for the network that switches.Give an example, AP 122 is sent to the Internet 112 with business from communication terminal 106 via corresponding back haul link 124, is sent to again then to call out to stop unit 114.Although and not shown, the voip call clearing end is as server 116, also can be positioned at the PQMF server that is associated near.

System 100 only shows single, simple network configuration.Yet, can many other, more complicated structures be arranged desirable system 100, these structures can comprise a plurality of for electronic equipment and various wireless, the wired network protocol replaced.In addition, for instance, the parts in the system 100 help to realize that mobile communication terminal 106 seamlessly switches to another network from terminal 106 presently used AP.In addition, although with system specifically describe for QoS at speech data (VoIP) determine relevant, yet what can expect is also can carry out QoS to other transmitted in packets on the back haul link (for example, broadband data services) and determine.

Fig. 2 shows the block diagram of protocol layer, and wherein, implementation quality is determined or the tolerance monitoring on these protocol layers in communication system (for example, the system among Fig. 1 100).The end-point terminals 202 that participates in voip call is used to monitor the not homometric(al) that each layer gone up influences QoS.Just as will be described, communication terminal 202 can be on the link on the link between terminal 202 and the access point 204, between terminal 202 and the voip call clearing end 206 monitoring protocol layer parameter (for example, physics (PHY) layer parameter, medium access control (MAC) layer parameter and application layer parameter) or tolerance.Communication terminal 202 is similar to communication terminal device shown in Figure 1 106 or communication terminal device 108.

At PHY layer 208, a measured tolerance comprises, for example: the signal power of the wireless signal that receives from access point (AP) 204.Especially for WAP (wireless access point), can use received signal intensity indication (RSSI) to determine this tolerance.According to an example, in Wi-Fi 802.11 WLAN, at the fixed time the section (be called T herein _PWR) in the average of a plurality of RSSI samples of receiving determine or calculate.In the present invention, this average is defined as downlink power (DL_PWR), in Fig. 2, indicates by drawing reference numeral 210.It should be noted that during the downlink silence of voip call the Frame of VoIP stream can't provide RSSI to upgrade.Yet the collected RSSI sample of communication terminal 202 can be corresponding to the frame of any kind that is derived from access point (AP) 204, and is not only the VoIP Frame.In addition, it not is the frame that is intended to be sent to it that terminal 202 can be used, so that upgrade RSSI.At Signal Interference and Noise Ratio (SINR) but the time spent also can use SINR, it has reflected interference and the noise that influences the frame decoding ability.

Terminal 202 is used downlink power or SINR tolerance, switches or other correction operation (for example, when predetermined threshold is surmounted, changing data transfer rate or encoding rate) so that trigger.Give an example, with regard to Wi-Fi 802.11 access points, threshold value is according to the sensitivity of the receiver hardware of the data transfer rate of AP 204 and terminal 202, establishes according to experience.

Terminal 202 comprises the monitoring as layer 210 indicated MAC layer.At the MAC layer, can utilize terminal 202 to determine down link tolerance and up link tolerance.

With regard to MAC layer down link tolerance, can expect the not homometric(al) that several are used for determining QoS.Generally speaking, at down link, these tolerance (being indicated by arrow 214 and arrow 216 in Fig. 2) relate to Frame Check Sequence (FCS) mistake and to the frame of losing or retransmit and determining; At up link, relate to Loss Rate and retransmission rate are determined.In addition, it should be noted that these tolerance can use 802.11 MAC management information banks (MIB), local cache information (comprising that buffer memory overflows) to realize.

Employed first down link tolerance relates to the frame number with fcs error that monitoring receives.This tolerance provides the indication to downlink channel conditions.This tolerance can be used to before downlink packet losses takes place channel degradation be detected, and this tolerance can also be quickened the search of switching target or initiates some other operation to improve link-quality.Yet, it should be noted that this tolerance does not have warning function in fast-changing application scenarios, wherein, in fast-changing application scenarios, after path loss or the quick increase of interference level, PHY layer even can't detect frame thus, just any fcs error can not occur yet.

According to an example in the Wi-Fi network (IEEE 802.11), in the present invention, the ratio of the variation of down link fcs error counting and the variation of all fragmentation counts that receive is called " WLAN_DL_FCS ", it is quantized definition according to as follows:

$\mathrm{WLAN}\_\mathrm{DL}\_\mathrm{FCS}=\frac{\mathrm{\Δdot}11\mathrm{FCSErrorCount}}{\mathrm{\Δdot}11\mathrm{ReceivedFragmentCount}}---\left(1\right)$

Wherein, MIB period (T in the past _MIB) in, the variation or the Δ value of fcs error counting and received fragmentation count calculate according to MAC MIB Counter Value.Because between quiet period, can not receive any new frame and MAC MIB counter does not change yet, thus, WLAN_DL_FCS is invalid between quiet period.Dot11FCSErrorCount is a MAC MIB value of calculating the fcs error number.Dot11ReceivedFragmentCount calculates received segments purpose MAC MIB value.

Employed second MAC down link tolerance is the MAC of the lower floor calculating to correct grouping (that is the grouping of, the losing) proportion that transmits of failing.No matter this guaranteed all can to monitor the MAC down link in which kind of is used.The tolerance that will be referred to as " WLAN_DL_LOSS " is defined as the shared ratio of MAC service data unit (MSDU) of the upper strata MAC that fails to be sent to by the MAC of lower floor.This ratio can define according to following relational expression:

$\mathrm{WLAN}\_\mathrm{DL}\_\mathrm{LOSS}=\frac{\mathrm{\ΔnotReceivedMSDU}}{\mathrm{\ΔMSDU}\_\mathrm{sequence}\_\mathrm{number}}---\left(2\right)$

Wherein Δ MSDU_sequence_number represents the fixed window size of MSDU, and Δ notReceivedMSDU is meant the number of the frame that receives of failing in the window of Δ MSDU_sequence_number.It should be noted that, in the implementation procedure of WLAN_DL_LOSS, the employed MAC sequence number of transmit leg (for example, AP 204) is that increment increases gradually for each the new MSDU at each purpose terminal with one (perhaps being a known fixed value at least).It should be noted that therefore this tolerance possibly can't correctly be assessed the grouping of losing in this case owing to may not can receive new frame under the situation that channel declines rapidly.In addition, it should be noted that also therefore WLAN_DL_LOSS tolerance also may be invalid between the calling quiet period owing to can not detect new sequence number or MDSU between the calling quiet period.

In the system with rate adaptation characteristics (for example, 802.11), the 3rd the MAC tolerance that is used for the measure link quality is the current selected speed of access point.The low decline of having indicated link-quality of speed.

Utilize MAC depth amount as described above, take to correct operation to improve communication link quality.In an example, correct operation and comprise: under the situation that one or more activation threshold values are surmounted, the switching of triggering terminal 202.Give an example, activation threshold value that can WLAN_DL_FCS is set to 50%, if this means in the frame that receives have half fcs error to occur, then triggers and corrects operation.Trigger value at the WLAN_DL_LOSS of audio call tolerance can be the percentage of regulation, in case and this percentage is exceeded, then will obviously demote as the average evaluation score (MOS, Mean Opinion Score) of the index of perceptual speech quality.For data session, this is the percentage of regulation, and for example, in case surpassed the percentage of defined, then transmission control protocol (TCP) can't reach rational throughput.Illustrate the percentage how regulation is set, it should be noted that typical codec was output as for 50 frame/seconds, average window is 1 second.Correspondingly, for example, if the WLAN_DL_LOSS threshold percentage is set to 6%, then this percentage has 3 LOFs corresponding to per 1 second window, and this percentage also allows error burst to a certain degree.

It should be noted that also owing to the period free of data of mourning in silence in calling is downloaded, so above-mentioned MAC down link tolerance is mourned in silence the period in calling may not be available.Correspondingly, in an example, during the period is mourned in silence in calling,, also carry out quality and determine according to other tolerance except that according to the MAC down link tolerance.In another example, because the inherent limitations of MAC down link tolerance, it is not used for triggering corrects operation, and only is used for informing the triggering according to other other tolerance.For example, described restriction comprises: FCS tolerance does not have warning function in fast-changing application scenarios, wherein, in this fast-changing application scenarios, because the quick increase of path loss, PHY even can't detect frame, thus, just any fcs error can not appear yet.In addition, when access point (AP) transmission has the grouping of discontinuous MAC sequence number, should not use tolerance based on MSDU.Therefore, before using this tolerance, stand and at first detect AP 204 and whether send continuous sequence number.

Along from the terminal 202 of an end of audio call on the uplink path of the terminal (not shown) of the other end, exist a plurality of potential fault points or decline point, for example, WLAN up link, broadband backhaul, carrier network (for example, IP network) and the final link that arrives other end terminal.Monitor than the other parts for described link, 202 pairs of WLAN up links of terminal are monitored relatively easily.In addition, to the WLAN up link monitor can find the decline that causes owing to loss that WLAN overload is caused or since the position of interference source near WLAN access point (for example, AP 204) and the decline that causes.Correspondingly, shown in the arrow among Fig. 2 216, apparatus and method of the present invention also make terminal 202 in MAC layer monitoring up link tolerance.

According to a concrete aspect, current disclosed apparatus and method can be used WLAN up link loss (WLAN_UL_LOSS) tolerance of structure, are defined as follows:

WLAN_UL_LOSS＝UL_HOST_LOSS+WLAN_UL_MAC_LOSS (3)

UL_HOST_LOSS in the above-mentioned equation (3) has reflected the time interval (T in the past that calculates _MIB) the shared ratio of frame (for example, buffer memory overflows) of losing in the buffer memory of inherent main frame (for example, terminal 202).With regard to quantity, can quantize to determine to UL_HOST_LOSS according to following relational expression:

$\mathrm{UL}\_\mathrm{HOST}\_\mathrm{LOSS}=\frac{\mathrm{\ΔMSDU}\_\mathrm{lost}\_\mathrm{host}}{N_{\mathrm{ExpectedFrames}}}.---\left(4\right)$

Wherein, N _{ExpectedFrames}Reflected desired at T _MIBThe frame number of interim terminal codec output.It should be noted that the buffer memory that is used for the VoIP business queuing in the terminal 202 does not comprise the data that surpassed the output time threshold value, for example, for example general 240ms is then roughly corresponding to 12 frame data.If data have surpassed this capacity of queue, postponing so will be excessive, thereby the frame that exceeds this delay will be dropped.Write down the frame that these are dropped, represent their variation by the Δ MSDU_lost_host in the above-mentioned equation (4).

The shared ratio of frame of having lost when the value of the WLAN_UL_MAC_LOSS in the above-mentioned equation (3) has reflected aerial the transmission is every T _MIBThis value is calculated, as follows:

$\mathrm{WLAN}\_\mathrm{UL}\_\mathrm{MAC}\_\mathrm{LOSS}=\frac{\mathrm{\Δdot}11\mathrm{FailedCount}}{\mathrm{\Δdot}11\mathrm{TransmittedFrameCount}+\mathrm{\Δdot}11\mathrm{FailedCount}}---\left(5\right)$

Under any circumstance, the Δ value of Failed count (failure count) in the equation (5) and TransmittedFrame Count (counting of the frame of transmission) is the T according to the past _MIBMACMIB Counter Value in the time interval calculates.Dot11FailedCount represents to be used at the MAC MIB counter of counting through the frame number of still failing to send after the trial of maximum times.Dot11TransmittedFrameCountS represents MACMIB counter that the frame number sent of station is counted.

About the threshold value of the tolerance WLAN_UL_LOSS that is used for that quality is determined and triggers, it should be noted that according to experience general 6% if the value of WLAN_UL_LOSS has surpassed, the average evaluation score (MOS) of VoIP will obviously be demoted so.Correspondingly, because typical codec was output as for 50 frame/seconds and average window is 1 second, example values that therefore can up link loss tolerance is set to 6%, and this is corresponding to 3 groupings of losing and permission error burst to a certain degree.

It should be noted that during the period of mourning in silence the number of the frame that is sent is seldom so that be difficult to the accurate estimating uplink proportion of goods damageds.For example, during the period of mourning in silence, the situation of losing a frame in three frames will mean too pessimistic 33% the up link proportion of goods damageds.If at T _MIBInterim, observed grouping number was lower than threshold value, then used PQMF to check link-quality, with as remedying measure.

According to a concrete example, apparatus and method of the present invention can be utilized required average repeat time of a frame and the shared ratio of frame that need at least once retransmit of sending on up link.

It should be noted that 802.11 MAC MIB comprise that a lot of other helps to monitor the tolerance of up link QoS, these tolerance comprise, for example: at the counter of confirming that failure and retry divide into groups.These tolerance are stipulated handover trigger in the mode identical with fail count as described above.

Although also it should be noted that and use MAC MIB value to describe a realization, yet same realization does not need to inquire about MAC MIB and can finish yet.In addition, in MAC, can directly calculate tolerance.In addition, it is the same to be similar to above described usage at down link, also can use uplink data rate.

Whether as described above, the tolerance of 202 pairs of PHY layers of terminal and MAC layer is monitored, decline to judge Radio Link, especially for WLAN.Yet, for other network symptom, for example, can to assist terminal (202) to judge whether be that problem has appearred in backhaul by high level is monitored.Correspondingly, terminal 202 uses the service of MAC that agreement tolerance is monitored, and is depicted as " application " or RTP layer 218.In the object lesson in Fig. 2, the application layer metric of being monitored with the downlink loss of VoIP business is monitored relevant, shown in VOIP_DL_LOSS among Fig. 2 220.

Application layer downlink loss tolerance VOIP_DL_LOSS is intended to the audio stream quality that reflects that the user hears.Therefore, this tolerance is used for the output monitoring part grouping at dithering cache, wherein, in case audio decoder is perceived these groupings, the deletion of just should dividing into groups.In other words, can think that this is measured does not in time arrive decoder for the grouping shared ratio of playing in having reflected at the fixed time at interval.It should be noted that " grouping " in the context is defined as the payload of RTP grouping, and " frame " refers to the content of the one-tenth frame unit that uses codec.Grouping comprises: for example, be used for the information (for example silence packet) of reconstruct several frames.

Specifically, can define this tolerance quantitatively according to following relational expression:

$\mathrm{VOIP}\_\mathrm{DL}\_\mathrm{LOSS}=1-\frac{N_{\mathrm{ReceivedFrames}}}{N_{\mathrm{ExpectedFrames}}}---\left(6\right)$

Wherein, N _{ExpectedFrames}Be at measuring intervals of TIME T _VOIPThe counting of the frame number that inner demoder is desired, N _{ReceivedFrames}It is the counting of frame number that actual reception is arrived.Can upgrade this two kinds of frame counts according to the RTP sequence number of the grouping that occurs at the dithering cache output.

It should be noted that this tolerance VOIP_DL_LOSS and continuous codec (for example, G.711) no-float, wherein, N _{ExpectedFrames}At each measurement period T _VOIPAll be identical.For the discontinuous codec with regular quiet frame (for example, AMR, EVRC, EVRC-B), between quiet period, frame counter slowly increases, and may produce the more inaccurate estimation to downlink quality thus.For example, between quiet period, the situation of losing a frame in three frames will be indicated too pessimistic 33% the proportion of goods damageds.Between quiet period, when codec stops transmit frame fully, this VOIP_DL_LOSS tolerance will not have any renewal so, also can't follow the suggestion (as some realization G.711) of RFC 3551 thus.In these cases, apparatus and method of the present invention also can further be configured to ignore VOIP_DL_LOSS tolerance (according at T _VOIPA small amount of desired frame in period), but for example according to PQMF, with accurate monitoring link-quality.

It should be noted that also to have certain situation, in these cases, use above-mentioned tolerance to assist decision whether to trigger switching and can not improve QoS, but also can cause unnecessary spending.For example, suppose that the source of quality problems is remote port (that is, after calling out clearing end 206), yet even if local lan and back haul link are good, application layer metric still can be indicated a large amount of download packet loss.Therefore, because problem goes out at remote port, so trigger the purpose that can not reach improvement to the switching of another network according to this detection.This switching has caused unnecessary spending, but also has eliminated the potential advantages that calling remained on LAN.For the consideration to cost and performance, the user wishes calling is remained on LAN.On the contrary, when application layer metric but causes remote port mistake to occur in the backhaul uplink deterioration, indicate few download packet loss.Thus, for remote port, do not trigger the continuous decline that will cause QoS from the switching of local lan.In another example, according to the RSSI that suitable detection goes out, the switching of indication from WLAN to the local lan.Yet in this case, if backhaul link quality descends, the switching to local lan can cause that packet loss is arranged after switching so.In addition, between quiet period, a lot of above-mentioned tolerance are all unavailable.

Therefore, can be used to the definite and triggering switching of evaluation quality more exactly at the path quality monitoring function (PQMF) 222 shown in Fig. 2.Terminal (for example, 202) possesses the function that detects path quality decline, and this function can realize by software, hardware or both combinations.Terminal 202 be positioned at the upstream, divide into groups near PQMF server 224 exchanges of calling out the clearing end 206.PQMF server 224 is placed wide-band terminal place, upstream, help (for example, monitoring backhaul) effectively monitored in the broadband, and can guarantee the through clearing end 206 of calling out of all business (signaling and supporting body) that sends from terminal 202.

It should be noted that under above-mentioned mentioned situation, other tolerance possibly can't provide quality evaluation accurately switching, and PQMF be except using in these cases, it also possesses robustness between quiet period.Be at exercise question that " METHODS AND APPARATUS FORDETERMINING COMMUNICATION LINK QUALITY ", attorney docket are 0700018, PQMF carried out detailed description in the application common co-pending of application people for Deshpande etc., wherein, should co-pending application incorporate the application into way of reference.

See figures.1.and.2, can notice, 202 pairs of communication terminal 106 or communication terminals mail to nearest base station in another potential changeable network (for example, 118) signal strength signal intensity are measured, so that whether decision switches to this network.Correspondingly, suppose that another cellular system can use, and the WAN signal strength signal intensity is higher than snr threshold SNR _AddThreshold, then the handoff algorithms code is as follows:

If(RSSI＜RSSI _{DropThreshold})

Handoff?due?to?low?Wi-Fi?signal?strength

Else?if(WLAN_UL_LOSS＞PER _{ExitThreshold})

If(Number?UL?packets?transmitted＜N _{MinULPacketSamples})

Send?N _Fast?PQMF?packets?spaced?T _FastInterval?apart?and?measure

their?RTT

Handoff?if?more?than?N _{FastLossThreshold}?packets?have?RTT＞

T _FastTimeout

Else

Handoff?due?to?poor?local?Wi-Fi?uplink

End

Else?if(VOIP_DL_LOSS＞PER _{ExitThreshold}?or?PQMF?RTT＞T _SlowTimeout)

Send?N _Fast?PQMF?packets?spaced?T _FastInterval?apart?and?measure?their

RTT

Handoff?if?more?than?N _{FastLossThreshold}?packets?have?RTT＞T _FastTimeout

Else

Retain?call?on?Wi-Fi

End

Wherein, RTT is the two-way time of PQMF grouping or frame.

Should be noted that above-mentioned algorithm has used the tolerance and the PQMF of PHY (down link) protocol layer, MAC (up link) protocol layer, application (down link) protocol layer.Yet what can expect is that only using, the tolerance of two protocol layers realizes apparatus and method disclosed in this invention.For example, the tolerance of use PHY layer and MAC layer is determined the correction operation (comprise and switch decision) of QoS and generation then.In other example, the tolerance of collaborative use PHY layer and the tolerance (comprising PQMF) of application layer, or only use the tolerance of MAC layer and the tolerance of application layer that quality and correction operation are determined.Thus, Fig. 3 shows recapitulative method how to use above-mentioned tolerance in communication system together.

Fig. 3 is the block diagram of method 300 that is used for determining the communication link quality of communication system, and this method 300 can realize in communication system (such as Fig. 1 or system shown in Figure 2).Particularly, method 300 is carried out by the communication terminal such as terminal 106, terminal 108 or terminal 202.For example it should be noted that, when in method 300, using PQMF, can utilize the auxiliary of PQMF server, such as server 116 or server 224 or equivalent device or function.

After the initialization, shown in square frame 302, at least two tolerance of at least two different agreement layers of 300 pairs of communication terminals of method determine that wherein, described tolerance reflects the communication system parameter.It should be noted that described protocol layer is at least two in PHY layer, MAC layer, the application layer (comprising PQMF), described definite can the execution by communication terminal (for example, 106 or 202).In addition, these tolerance comprise any tolerance at least in previous described several tolerance of the present invention.Two-layerly determine which uses by the logic in the communication terminal.

After square frame 302 places determine at least two tolerance, determined those tolerance are compared with their threshold values separately at square frame 304 places.As above described in detail, consider and the theory of concrete communication network is determined according to experience the key element that constitutes abundant QoS, pre-determine respectively different threshold values at each tolerance.In addition, can also threshold value be carried out determining adaptively according to the multiple situation of communication system.

After with described tolerance and threshold, flow process advances to decision square frame 306.At square frame 306 places, more whether showing of decisional block 304 surmounted one or more predetermined thresholds.In other words, whether having surmounted predetermined threshold according to one or more tolerance makes QoS and determines.If at least one threshold value is surmounted, then flow process advances to square frame 308, takes suitable operation to improve QoS at square frame 308.In an example, the operation of being taked comprises: if another network can be used, then triggering terminal (for example, WLAN) switches to another network (for example, WWAN) from current network.In order to other suitable operation of improving QoS or correct operation and comprise: adjust that encoding rate and modulation, management are disturbed, improved transmitting power, activate multiple-input and multiple-output (MIMO), abandoned call and from call service provider or the higher QoS of broadband provider request, the certain operations in will operating these hereinafter be described in more detail.

For ul transmissions, communication terminal (for example, 106 or 202) can be finished the adjustment to modulation and encoding rate voluntarily.For down link, this terminal uses particular message should how modulation and encoding rate be adjusted to the access point indication, thereby improves QoS.If closed loop rate control is available, then use closed loop rate control, so that the QoS of maximization link.

Can realize interference management by redeploy transmission to another wireless channel.As what supported in the 802.11v standard, terminal can ask access point to change current channel.Terminal can also be used the technology that is called Interference Cancellation.Yet, why do not use interference cancellation techniques always, be because this technology takies CPU in a large number, therefore can the loss battery life, and battery life mobile device institute special concern just.Request transmission (RTS) message and clear to send (promptly allowing to send) (CTS) message are carried out interference management by the mode of reserving transmission medium.Terminal can also ask access point to use centralized scheduling scheme (for example, 802.11 point coordination function (PCF) or energy-conservation many polls (PSMP, power save multi poll)) to disturb to reduce.

Similarly, use the MIMO transmission that more reliable link can be provided, yet the cost aspect CPU processing, bandwidth, protocol overhead also may be very big.In addition, can ask higher QoS by the mode that the radio bearer that is used to transmit is consulted again.Depend on system status, this means the tax-free call service is converted to the Paycall service.In a single day terminal also can just be adjusted transmitting power when realizing that up link is in the loss situation (for example when WLAN_UL_MAC_LOSS increases).The raising of transmitting power can make at the bigger SINR of receiver place generation, and can improve the QoS of link usually.In addition, when detecting downlink loss (for example, when DL_LOSS increases), stand and use particular message request access point to improve transmitting power at the station.

Rotate back into Fig. 3, at block diagram 306 places, if threshold value is not all surmounted, so this situation has just been indicated for Network (for example, the VoIP business), and the QoS of current network meets the demands, and does not operate thereby do not need to carry out to correct.It should be noted that the processing of carrying out in square frame 306 and square frame 308 places can be depicted as: the relatively QoS of network is determined only according at least two tolerance and their threshold values separately.

After the processing of square frame 306 or square frame 308, flow process is returned square frame 302, and repetitive process 300 is so that continue monitoring or definite QoS.It should be noted that this processing is periodic, wherein, the process of getting back to square frame 302 from square frame 306 or square frame 308, have the time-delay (not shown).In another example, can only simply carry out one time process 300.

Fig. 4 shows and is used for determining communication link QoS, and determines the exemplary means switched according to quality.It should be noted that device 400 both can be used as communication terminal, for example terminal 106 among Fig. 1 and Fig. 2, terminal 108 or terminal 202; Also can be as the processor or the similar devices that in these communication terminals, use.As depicted, device 400 comprises: module 402 is used for determining at least two tolerance of at least two different agreement layers, for example the tolerance of PHY, MAC or application layer.As in Fig. 4, seeing, exemplarily represent PHY (down link), MAC (up link and down link), use monitoring that (down link) layer carried out and, comprising: send grouping and receive respond packet from the arrow of module 402 output and the arrow that points to module 402 from the PQMF server to PQMF server (for example server 224) to determining that the tolerance of these layers is carried out.

Transmit and the relevant information of module 402 determined at least two tolerance to module 406 via bus 404 (or similar connection).As described in detail in conjunction with Fig. 2, module 406 is used at least two tolerance and their predetermined thresholds are separately compared.According to comparative result, can obtain determining to QoS.Subsequently, the QoS that will obtain according to the comparison with threshold value via bus 404 is sent to module 408, carries out according to module 406 determined quality in module 408 and corrects operation.As discussed above, the example of correcting operation include but not limited to: switch, adjust that encoding rate and modulation, management are disturbed, improved transmitting power, activate multiple-input and multiple-output (MIMO), abandoned call and ask higher QoS from call service provider or broadband provider.

In addition, alternatively, device 400 can comprise: processor 414, be used for being embodied as under the situation of a terminal equipment at device 400, and the process that a plurality of modules are performed is carried out initialization and scheduling.In addition, this device can also comprise: optional computer-readable medium or memory device 412, be used for storage computation machine instructions, wherein, be embodied as terminal equipment and be not only under the situation of employed processor in this kind equipment at device 400, this computer-readable instruction is used to realize disclosed herein in conjunction with the module of optional processor 400 or the process of method.

It should be noted that device 400 can also comprise: module 414 is used for having indicated under the situation of of inferior quality service quality at least one tolerance of at least two tolerance execution route quality-monitoring function (PQMF).In addition, device 400 also comprises: module 416, it uses PQMF to judge whether to be the part in the communication system to cause service quality that do not meet the demands or of inferior quality.In addition, device 400 can also comprise: module 418 is used for (that is, having used PQMF to determine that of inferior quality service quality is not to be caused by the part in the communication system) under the situation that path quality meets the demands, stop to carry out correct operation (for example, module 408 initiated correction operation).

According to the above discussion, should be understood that current disclosed method and apparatus provides accurately the determining of QoS, and then can provide and correct operation (for example, switching decision) more accurately.Especially, by the tolerance of at least two different layers in the communication system being determined accuracy can be increased.

Should be appreciated that the certain order of step of disclosed process or level only are examples in the illustrative methods.According to design preference, only should be appreciated that otherwise depart from the scope of the present invention, just can the certain order or the level of the step of process be rearranged.Appended claim to a method has presented the unit of each step with exemplary order, but is not intended to the order of the unit of each step is limited to certain order or the level that is presented.

It should be understood by one skilled in the art that information and signal can use multiple different technology and method to represent.For example, the data of mentioning in the description on run through, instruction, order, information, signal, bit, symbol and chip can be represented with voltage, electric current, electromagnetic wave, magnetic field or particle, light field or particle or its combination in any.

Those of ordinary skills be to be further appreciated that, all can be implemented as electronic hardware, computer software or both combinations in conjunction with the described various illustrative logical blocks of embodiments of the invention, module, circuit and algorithm steps.In order clearly to represent the interchangeability between the hardware and software, above various exemplary parts, frame, module, circuit and step have all been carried out describe, in general terms around its function.Be embodied as hardware or be embodied as software as for this function, depend on specific application and design constraint that whole system applied.Those skilled in the art can be at each application-specific, realizes described function in the mode of accommodation, and still, this realization decision-making should not be construed as and deviated from protection scope of the present invention.

Be used to carry out general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components or its combination in any of function of the present invention, can realize or carry out in conjunction with the described various exemplary logic diagrams of embodiments of the invention, module and circuit.General processor can be a microprocessor, and perhaps, this processor also can be processor, controller, microcontroller or the state machine of any routine.Processor also may be embodied as the combination of computing equipment, and for example, the combination of DSP and microprocessor, a plurality of microprocessor, one or more microprocessor combine with the DSP kernel, perhaps any other this kind structure.

Software module or its combination that can directly be presented as hardware, carry out by processor in conjunction with the step of described method of embodiments of the invention or algorithm.Software module can be arranged in the storage medium of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, mobile disk, CD-ROM or any other form well known in the art.A kind of exemplary storage medium (not shown) is connected to processor, thereby makes the processor can be from this read information, and can be to this storage medium writing information.Certainly, storage medium also can be the part of processor.Processor and storage medium can be arranged in ASIC.This ASIC can be arranged in user terminal.Certainly, processor and storage medium also can be used as discrete assembly and are present in the user terminal.

Example as described above only is exemplary, and those of ordinary skills can carry out multiple utilization and modification to example as described above on the basis that does not break away from inventive point disclosed in this invention.To those skilled in the art; the various alter modes of these examples all are conspicuous; and the defined general principles of the present invention also can (for example be applied to other example on the basis that does not break away from spirit of the present invention and protection range; on the basis of spirit that does not break away from novel aspect described in the invention and protection range, be applied to instant messaging service or any general wireless data communication applications).Therefore, scope disclosed by the invention is not intended to be limited to the example that the present invention provides, but consistent with the widest scope of principle disclosed by the invention and novel features.It should be noted that " exemplary " speech that uses among the present invention means " as example, illustration or explanation ".Any example that is described to " exemplary " among the present invention should not be interpreted as than other example more preferably or have more advantage.Correspondingly, novel aspect claims only according to the present invention described in the invention limit.

Claims (64)

1, a kind of method that is used for the service quality of definite communication network, described method comprises:

Determine at least two tolerance of at least two different protocol layers in the described communication network, wherein, described tolerance reflection network parameter;

Described at least two tolerance and their threshold values are separately compared;

According to described at least two tolerance and their comparisons of threshold value separately, determine the service quality of described network.

2, method according to claim 1 also comprises:

According to the determining of described service quality, carry out and correct operation to improve QoS.

3, method according to claim 2, wherein, carry out to correct operation and comprise one or more in the following operation:

Initiate communication terminal from of the switching of described communication network to alternative communication network;

Adjust encoding rate and modulation;

Management is disturbed;

Improve transmitting power;

Activate multiple-input and multiple-output (MIMO);

Abandon current calling;

From the higher QoS of call service provider request.

4, method according to claim 3, wherein, described alternative communication network is one of in wireless wide area network or the WLAN (wireless local area network).

5, method according to claim 1, wherein, described at least two tolerance comprise the tolerance of representing the following respectively: two layers in physical layer, MAC layer and the application layer; Communication path from the terminal to the clearing end is carried out the path quality monitoring.

6, method according to claim 5, wherein, the tolerance of expression physical layer comprises: received signal power or Signal Interference and Noise Ratio to several samples of receiving are measured, wherein, in Frame, control frame or the management frames that described sample produces corresponding to access point one of at least.

7, method according to claim 5, wherein, the tolerance of expression MAC layer comprises the down link of described MAC layer, in the grouping that described tolerance also comprises measurement and received the part of mistake is arranged and calculates one or more in the shared ratio of the grouping that correctly do not receive.

8, method according to claim 5, wherein, the tolerance of expression MAC layer comprises the up link of described MAC layer, described measuring also comprises and is calculated as follows parameter:

At the buffer memory of communication terminal or the shared ratio of frame of losing in using;

The ratio that the frame of losing when aloft transmitting is shared;

Send the required average repeat time of a frame;

Need at least once shared ratio of frame of re-transmission.

9, method according to claim 5, wherein, the tolerance of representing described application layer comprises the down link of described application layer, comprises calculating for the shared ratio of playing of grouping failing in time to arrive decoder at preset time at interval.

10, method according to claim 5 wherein, comprises the tolerance that the communication path from the terminal to the clearing end is carried out path quality monitoring and comprises:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

One or more second frames according to receiving calculate the frame transmission characteristic.

11, method according to claim 1 also comprises:

Described at least two tolerance and their threshold values are separately compared to determine service quality;

According at least one tolerance and the comparison of threshold value separately, carry out and correct operation.

12, method according to claim 1, wherein, described network is the real-time protocol (RTP) network.

13, method according to claim 1, wherein, described communication network comprises WLAN (wireless local area network) and back haul link at least.

14, method according to claim 1 also comprises:

Communication path execution route quality-monitoring to from the terminal to the clearing end comprises:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

During can't determine one of at least in described at least two tolerance, one or more second frames according to being received calculate the frame transmission characteristic.

15, method according to claim 1 also comprises:

During the of inferior quality service quality of one of at least indication in described at least two tolerance, execution route quality-monitoring function;

Use described path quality monitoring function to determine to have caused in the described communication system part of described bad quality.

16, method according to claim 2 also comprises:

During the of inferior quality service quality of one of at least indication in described at least two tolerance, execution route quality-monitoring function;

Use described path quality monitoring function to judge whether to be the part of described communication system to cause described bad quality;

Determining it is not that the part of described communication system has caused under the situation of described bad quality, stop to carry out and correct operation.

17, a kind of communication equipment of in communication system, operating, described equipment comprises:

Processor comprises:

First module is used for determining at least two tolerance of at least two different protocol layers of communication network, wherein, and described tolerance reflection network parameter;

Second module is used for described at least two tolerance and their threshold values are separately compared;

Three module is used for determining the service quality of described network according to described at least two tolerance and their comparisons of threshold value separately.

18, communication equipment according to claim 17, wherein, described processor also comprises:

Four module is used for carrying out and correcting operation to improve QoS according to the determining of described service quality.

19, communication equipment according to claim 18, wherein, described correction operation comprises one or more in the following operation:

Initiate communication terminal from of the switching of described communication network to alternative communication network;

Change encoding rate;

Management is disturbed;

Improve transmitting power;

Activate multiple-input and multiple-output (MIMO);

Abandon current calling;

From the higher QoS of call service provider request.

20, communication equipment according to claim 19, wherein, described alternative communication network is one of in wireless wide area network or the WLAN (wireless local area network).

21, communication equipment according to claim 17, wherein, described at least two tolerance comprise the tolerance of representing the following respectively: two layers in physical layer, MAC layer and the application layer; Communication path from the terminal to the clearing end is carried out the path quality monitoring.

22, communication equipment according to claim 21, wherein, the described tolerance of expression physical layer comprises: received signal power or Signal Interference and Noise Ratio to several samples of receiving are measured, wherein, in the Frame, control frame or the management frames that produce corresponding to access point of described sample one of at least.

23, communication equipment according to claim 21, wherein, the described tolerance of expression MAC layer comprises the down link of described MAC layer, and described measuring has the part of mistake in the grouping that also comprises measurement and received and calculate one or more in the shared ratio of the grouping that correctly do not receive.

24, communication equipment according to claim 21, wherein, the described tolerance of expression MAC layer comprises the up link of described MAC layer, described measuring also comprises and is calculated as follows parameter:

At the buffer memory of communication terminal or the shared ratio of frame of losing in using;

The ratio that the frame of losing when aloft transmitting is shared;

Send the required average repeat time of a frame;

Need at least once shared ratio of frame of re-transmission.

25, communication equipment according to claim 21, wherein, the described tolerance of representing described application layer comprises the down link of described application layer, comprises calculating for the shared ratio of playing of grouping failing in time to arrive decoder at preset time at interval.

26, communication equipment according to claim 21 wherein, comprises the described tolerance that the communication path from the terminal to the clearing end is carried out path quality monitoring and comprises:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

One or more second frames according to receiving calculate the frame transmission characteristic.

27, communicator according to claim 17, wherein, described processor also comprises:

Four module is used for described at least two tolerance and their threshold values are separately compared, to determine service quality;

The 5th module is used for carrying out and correcting operation according to the comparison of at least one tolerance with its threshold value.

28, communicator according to claim 17, wherein, described network is the real-time protocol (RTP) network.

29, communicator according to claim 17, wherein, described communication network comprises WLAN (wireless local area network) and back haul link at least.

30, communicator according to claim 17, wherein, described processor also comprises:

Four module is used for the communication path from the terminal to the clearing end is carried out the path quality monitoring, comprising:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

Can't determine described at least two tolerance one of at least the time, one or more second frames according to receiving calculate the frame transmission characteristic.

31, communication equipment according to claim 17, wherein, described processor also comprises:

Four module is used for when the of inferior quality service quality of one of at least indication of described two tolerance execution route quality-monitoring function at least;

The 5th module is used for using described path quality monitoring function to determine that described communication system has caused the part of described bad quality.

32, communication equipment according to claim 18, wherein, described processor also comprises:

Four module is used for when the of inferior quality service quality of one of at least indication of described two tolerance execution route quality-monitoring function at least;

The 5th module, being used to use described path quality monitoring function to judge whether is that the part of described communication system has caused described bad quality;

The 6th module is used for stoping to carry out and correcting operation determining it is not that the part of described communication system has caused under the situation of described bad quality.

33, a kind of device that is used for the quality of definite communication link comprises:

Measure determining unit, be used for determining at least two tolerance of at least two different protocol layers of communication network, wherein, described tolerance reflection network parameter;

Comparing unit is used for described at least two tolerance and their threshold values are separately compared;

The quality determining unit is used for determining the service quality of described network according to described at least two tolerance and their comparisons of threshold value separately.

34, device according to claim 33 also comprises:

Performance element is used for according to the service quality of determining, carries out and corrects operation to improve QoS.

35, device according to claim 34, wherein, described correction operation comprises one or more in the following operation:

Initiate communication terminal from of the switching of described communication network to alternative communication network;

Change encoding rate;

Management is disturbed;

Improve transmitting power;

Activate multiple-input and multiple-output (MIMO);

Abandon current calling;

From the higher QoS of call service provider request.

36, device according to claim 35, wherein, described alternative communication network is one of in wireless wide area network or the WLAN (wireless local area network).

37, device according to claim 33, wherein, described at least two tolerance comprise the tolerance of representing the following respectively: two layers in physical layer, MAC layer and the application layer; Communication path from the terminal to the clearing end is carried out the path quality monitoring.

38, according to the described device of claim 37, wherein, the described tolerance of expression physical layer comprises: received signal power or Signal Interference and Noise Ratio to several samples of receiving are measured, wherein, in the Frame, control frame or the management frames that produce corresponding to access point of described sample one of at least.

39, according to the described device of claim 37, wherein, the described tolerance of expression MAC layer comprises the down link of described MAC layer, and described measuring has the part of mistake in the grouping that also comprises measurement and received and calculate one or more in the shared ratio of the grouping that correctly do not receive.

40, according to the described device of claim 37, wherein, the described tolerance of expression MAC layer comprises the up link of described MAC layer, and described measuring also comprises and be calculated as follows parameter:

The shared ratio of frame of losing in the buffer memory of communication terminal or the application;

The ratio that the frame of losing when aloft transmitting is shared;

Send the required average repeat time of a frame;

Need at least once shared ratio of frame of re-transmission.

41, according to the described device of claim 37, wherein, the described tolerance of representing described application layer comprises the down link of described application layer, comprises calculating for the shared ratio of playing of grouping failing in time to arrive decoder at preset time at interval.

42,, wherein, comprise the described tolerance that the communication path from the terminal to the clearing end is carried out path quality monitoring and comprise according to the described device of claim 37:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

One or more second frames according to receiving calculate the frame transmission characteristic.

43, device according to claim 33 also comprises:

Comparing unit compares described at least two tolerance and their threshold values separately, to determine service quality;

Performance element according at least one tolerance and the comparison of threshold value separately, is carried out and is corrected operation.

44, device according to claim 33, wherein, described network is the real-time protocol (RTP) network.

45, device according to claim 33, wherein, described communication network comprises WLAN (wireless local area network) and back haul link at least.

46, device according to claim 33 also comprises:

Monitoring means is used for the communication path between from the terminal to the clearing end is carried out the path quality monitoring, comprising:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

Can't determine described at least two tolerance one of at least the time, one or more second frames according to receiving calculate the frame transmission characteristic.

47, device according to claim 33 also comprises:

Performance element is used for when the of inferior quality service quality of one of at least indication of described two tolerance execution route quality-monitoring function at least;

Determining unit is used for using described path quality monitoring function to determine that described communication system has caused the part of described bad quality.

48, device according to claim 34 also comprises:

Path quality monitoring function performance element is used for when the of inferior quality service quality of one of at least indication of described two tolerance execution route quality-monitoring function at least;

Determining unit, being used to use described path quality monitoring function to judge whether is that the part of described communication system has caused described bad quality;

Stop the unit, be used for stoping to carry out and correcting operation determining it is not that the part of described communication system has caused under the situation of described bad quality.

49, a kind of computer program product comprises:

Computer-readable medium comprises:

Make computer determine the code of at least two tolerance of at least two different protocol layers in the communication network, wherein, described tolerance reflection network parameter;

Make the code that computer compares described at least two tolerance and their threshold values separately;

Make computer according to described at least two tolerance and their comparisons of threshold value separately, determine the code of the service quality of described network.

50, according to the described computer program product of claim 49, wherein, described computer-readable medium also comprises:

Make computer according to determined service quality, carry out and correct operation to improve the code of QoS.

51, according to the described computer program product of claim 49, wherein, described correction operation comprises one or more in the following operation:

Initiate communication terminal from of the switching of described communication network to alternative communication network;

Change encoding rate;

Management is disturbed;

Improve transmitting power;

Activate multiple-input and multiple-output (MIMO);

Abandon current calling;

From the higher QoS of call service provider request.

52, according to the described computer program product of claim 51, wherein, described alternative communication network is one of in wireless wide area network or the WLAN (wireless local area network).

53, according to the described computer program product of claim 49, wherein, described at least two tolerance comprise the tolerance of representing the following respectively: two layers in physical layer, MAC layer and the application layer; Communication path from the terminal to the clearing end is carried out the path quality monitoring.

54, according to the described computer program product of claim 53, wherein, the described tolerance of expression physical layer comprises: received signal power or Signal Interference and Noise Ratio to a plurality of samples of receiving are measured, wherein, in the Frame, control frame or the management frames that produce corresponding to access point of described sample one of at least.

55, according to the described computer program product of claim 53, wherein, the described tolerance of expression MAC layer comprises the down link of described MAC layer, and described measuring comprises that also measuring institute receives one or more in the shared ratio of grouping that a part that mistake is arranged in the grouping and calculating correctly do not receive.

56, according to the described computer program product of claim 53, wherein, the described tolerance of expression MAC layer comprises the up link of described MAC layer, and described measuring also comprises and be calculated as follows parameter:

At the buffer memory of communication terminal or the shared ratio of frame of losing in using;

The ratio that the frame of losing when aloft transmitting is shared;

Send the required average repeat time of a frame;

Need at least once shared ratio of frame of re-transmission.

57, according to the described computer program product of claim 53, wherein, the described tolerance of representing described application layer comprises the down link of described application layer, comprises calculating for the shared ratio of playing of grouping failing in time to arrive decoder at preset time at interval.

58,, wherein, comprise the described tolerance that the communication path from the terminal to the clearing end is carried out path quality monitoring and comprise according to the described computer program product of claim 53:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

One or more second frames according to receiving calculate the frame transmission characteristic.

59, according to the described computer program product of claim 49, described computer-readable medium also comprises:

Make computer that described at least two tolerance and their threshold values are separately compared to determine the code of service quality;

Make computer according at least one tolerance and the comparison of threshold value separately, carry out the code of correcting operation.

60, according to the described computer program product of claim 49, wherein, described network is the real-time protocol (RTP) network.

61, according to the described computer program product of claim 49, wherein, described communication network comprises WLAN (wireless local area network) and back haul link at least.

62, according to the described computer program product of claim 49, described computer-readable medium also comprises:

Make computer to the code of the communication path execution route quality-monitoring from the terminal to the clearing end, comprising:

One or more first frames that have predefined type to the path quality Server Transport;

From one or more second frames of described server reception in response to described one or more first frames;

During can't determine one of at least in described at least two tolerance, one or more second frames according to receiving calculate the frame transmission characteristic.

63, according to the described computer program product of claim 49, described computer-readable medium also comprises:

When making at least one of the indication of inferior quality service quality of computer in described at least two tolerance, the code of execution route quality-monitoring function;

Make computer use described path quality monitoring function to determine to have caused in the described communication system code of the part of described bad quality.

64, according to the described computer program product of claim 50, described computer-readable medium also comprises:

When making at least one of the indication of inferior quality service quality of computer in described at least two tolerance, the code of execution route quality-monitoring function;

Make computer use described path quality monitoring function to judge whether to be the part of described communication system to cause the code of described bad quality;

Make computer determining it is not that the part of described communication system has caused under the situation of described bad quality, stop and carry out the code of correcting operation.

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