CN101379783A - Method and apparatus for detecting interference in a wireless communication system - Google Patents

Method and apparatus for detecting interference in a wireless communication system Download PDF

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Publication number
CN101379783A
CN101379783A CNA2007800045142A CN200780004514A CN101379783A CN 101379783 A CN101379783 A CN 101379783A CN A2007800045142 A CNA2007800045142 A CN A2007800045142A CN 200780004514 A CN200780004514 A CN 200780004514A CN 101379783 A CN101379783 A CN 101379783A
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channel
frequency channels
bluetooth
channels
excessive interference
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M·辛格
D·S·普罗帕赫
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Qualcomm Inc
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Qualcomm Inc
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Abstract

Techniques for classifying RF channels in a first system (e.g., a Bluetooth system) to mitigate the deleterious effects of interference from a second system (e.g., a WLAN system) are described. One or more metrics (e.g., PER and/or RSSI) are determined for the RF channels. Each RF channel may be classified as good or bad based on the metric(s) for that RF channel. Whether excessive interference is observed on any frequency channel for the second system is determined based on the metric(s) for the RF channels. Excessive interference may be declared if the average PER for RF channels overlapping a frequency channel exceeds a threshold THW or if the number of bad RF channels within the frequency channel exceeds a threshold THC. A set of usable RF channels is formed and includes good RF channels not overlapping any frequency channel with excessive interference.

Description

In wireless communication system, detect the method and apparatus that disturbs
[0001] to require to enjoy that on February 6th, 2006 submitted to, exercise question be 60/765 for " Method forInterference Detection in a Frequency Hopping System ", application number to the application, 982 U.S. Provisional Application No., this part provisional application has transferred the application's assignee, so incorporate the application into way of reference.
Technical field
[0002] puts it briefly, the present invention relates to communication, specifically, the present invention relates to be used for detecting the technology of disturbing at wireless communication system.
Background technology
[0003] for making distinct electronic apparatuses realize radio communication and wireless connections, wireless communication system has obtained disposing widely.These wireless systems comprise Wireless Personal Network (WPAN) system, wireless lan (wlan) system or the like.A lot of wireless systems all are operated on 2.4 Gigahertzs (GHz) frequency band, and its universal reason is that industry, science and technology and medical treatment (ISM) frequency band does not need to obtain licence plate.
[0004] a lot of WPAN systems have all realized bluetooth, and the latter is a kind of short-range radio technology.Bluetooth can realize interconnection between electronic equipment, for example, between cell phone and the earphone, between individual receiver (PC) and the peripheral hardware (as mouse and keyboard) or the like.Bluetooth has been adopted as IEEE 802.15 standards, and this is that the public can be known.Bluetooth can replace wired connection, and therefore becoming becomes more and more popular.Therefore, in the years to come, the quantity of bluetooth equipment is expected to realize increasing severely.
[0005] a lot of wlan systems have all been realized IEEE 802.11, and the latter is the series of standards of middle distance radiotechnics.IEEE 802.11 comprises 802.11,802.11a, 802.11b and 802.11g.802.11 frequency of utilization saltus step spread-spectrum (FHSS) or Direct swquence spread spectrum (DSSS), the data rate of 1 and 2 megabit of per second of support (Mbps) in the 2.4GHz frequency band.802.11b use DSSS, in the 2.4GHz frequency band, support data rate up to 11Mbps.802.11g use OFDM (OFDM), in the 2.4GHz frequency band, support data rate up to 54Mbps.These different IEEE 802.11 standards all are that the public can be known.Wlan system can be realized any one or its combination in IEEE 802.11 standards (for example, 802.11b and 802.11g), usually is expressed as 802.11b/g.Wlan system is supported the radio communication between the distinct electronic apparatuses, for example, and individual receiver, kneetop computer, cell phone or the like.In the years to come, the quantity of wlan system also is expected to realize increasing severely.
[0006] Bluetooth system, wlan system and/or other wireless system can be disposed closely mutually, for example, and at office block, family or the like.If these wireless systems are worked on same frequency band, so, the transmission of a system will cause interference to the transmission of other system.The interference meeting has a negative impact to the performance of all affected systems.
[0007] therefore, need to detect and alleviate the technology of interference in this area, so that multiple wireless system can coexist as on the identical frequency band.
Summary of the invention
[0008] technology of the application's description is used for the RF channel in first communication system (for example, Bluetooth system) is classified, to alleviate the harmful interference influence of second communication system (for example, wlan system).The device of describing according to an embodiment comprises at least one processor and memory.Processor is determined at least a tolerance (for example, packet error rate PER, received signal intensity index RSSI or the like) of the RF channel in first system.Processor judges whether observed excessive interference on a certain frequency channels of second system according at least a tolerance of the RF channel in first system.Then, processor is that first system construction can be used the RF channel set.This set will foreclose with the overlapping RF channel of any frequency channels with excessive interference.If use the available RF channel set of first system, then can avoid interference between first system and second system, and two systems can be operated on the same frequency band.
Various aspects of the present invention and embodiment are described [0009] in further detail.
Description of drawings
[0010] detailed description by providing below in conjunction with accompanying drawing, characteristic of the present invention and essence will become more apparent, and in institute's drawings attached, identical mark is represented identical parts.
[0011] Fig. 1 shows the deployment diagram of Bluetooth system and wlan system.
[0012] Fig. 2 shows the spectrogram of WLAN frequency channels 1,6 and 11.
[0013] Fig. 3 shows the frequency hopping of 79 Bluetooth systems of jumping.
[0014] Fig. 4 shows the workflow of the Bluetooth system that adopts the AFH technology.
[0015] Fig. 5 shows the flow process of dividing bluetooth RF channel according to PER.
[0016] Fig. 6 shows the flow process of dividing bluetooth RF channel according to RF channel quantity inferior.
[0017] Fig. 7 shows the flow process according to PER and RSSI division bluetooth RF channel.
[0018] Fig. 8 shows the block diagram of wireless device.
[0019] Fig. 9 shows the frequency hopping unit of wireless device.
Embodiment
[0020] " exemplary " used herein speech means " as example, illustration or explanation ".Here being described to any embodiment of " exemplary " or design should not be interpreted as than other embodiment or design more preferably or have more advantage.
[0021] Fig. 1 shows deployment Figure 100 of Bluetooth system and wlan system.Bluetooth system is supported the short-distance wireless communication between wireless device 120 and the earphone 122, and wireless device 120 and earphone 122 have been formed a piconet (piconet) 110.Bluetooth system is also supported the short-distance wireless communication between personal computer 130, mouse 132, keyboard 134 and the printer 136, and personal computer 130, mouse 132, keyboard 134 and printer 136 have also been formed a piconet 112.Piconet is the set of sharing the bluetooth equipment of identical frequency hopping channel.Usually, Bluetooth system can comprise any amount of piconet and any amount of equipment that communicates by Bluetooth technology.Bluetooth equipment can use different power classes, and the transmission range of the second class bluetooth equipment is 10 meters, and the transmission range of the 3rd class bluetooth equipment is 100 meters.
[0022] wlan system is supported the short-distance wireless communication between access point 150, wireless device 120, personal computer 130 and the laptop computer 140.Usually, wlan system can comprise any amount of access point, to support the radio communication of any amount of equipment.Wlan device also can pass through peer-to-peer communications, realizes mutual direct communication.Wlan system can be realized 802.11b and/or 802.11g, can be operated in the 2.4GHz frequency band identical with Bluetooth system.
[0023] frequency spectrum that 802.11b and 802.11g will from 2400 to 2495 MHz (MHz) scopes is divided into 14 frequency channels that alternation sum is overlapping, compiles to be channel 1 to 14.In the description of back, these frequency channels are also referred to as WLAN channel and WLAN frequency channels.Each WLAN frequency channels has the 22MHz bandwidth of 3 decibels (dB).The centre frequency of WLAN frequency channels 1 is 2412MHz, and the centre frequency of WLAN frequency channels 2 to 13 exceeds 5MHz continuously, and the centre frequency of WLAN frequency channels 14 is 2484MHz.The centre frequency of WLAN frequency channels 1 to 13 5MHz of being separated by, the centre frequency of the center frequency ratio WLAN frequency channels 13 of WLAN frequency channels 14 exceeds 10MHz.Be not all WLAN frequency channels all be available.For example, in the U.S., it is available having only WLAN frequency channels 1 to 11.
[0024] Fig. 2 shows WLAN frequency channels 1,6 commonly used in 802.11b and 802.11g and 11 spectrogram.WLAN channel 1,6 and 11 centre frequency are respectively 2412,2437 and 2462MHz, their 25MHz of being separated by.Because the WLAN frequency channels has the 22MHz bandwidth of 3dB, so WLAN channel 1,6 and 11 passband can not overlap each other.Thereby, in same geographic area, can not on all three WLAN frequency channels 1,6 and 11, work, this makes these WLAN frequency channels be subjected to the welcome of a lot of WLAN deployment schemes.
[0025] bluetooth can be operated in from 2400 to 2483.5MHz (being called complete bluetooth frequency band) or from the 2.4GHz frequency band of 2446.5 to 2483.5MHz (being called limited bluetooth frequency band).For the most of country that comprises the U.S., bluetooth frequency band all is available fully, and it is divided into 79 RF channels, and index is 0 to 78.Limited bluetooth frequency band is used in France, and it is divided into 23 RF channels, and index is 0 to 22.The width of each RF channel is 1MHz.In the following description, also these RF channels are called bluetooth channel and bluetooth RF channel.The centre frequency of 79 bluetooth RF channels in the bluetooth frequency band can be expressed as fully:
f k=2402+kMHz, k=0 ..., 78. formulas (1)
The centre frequency of 23 bluetooth RF channels in the limited bluetooth frequency band can be expressed as:
f k=2454+kMHz, k=0 ..., 22. formulas (2)
[0026] bluetooth has adopted frequency hopping, therefore, a certain message transmission in different time-gap saltus step in bluetooth RF interchannel.For bluetooth, the duration of each time slot is 625 microseconds (μ s).Bluetooth frequency band is used 79 jumping systems fully, and limited bluetooth frequency band is used 23 jumping systems.For clarity sake, launch to describe at complete bluetooth frequency band below.
[0027] Fig. 3 shows the frequency hopping on the time-frequency plane 300 of a piconet in 79 Bluetooth systems of jumping.This piconet comprises the slave unit of a main equipment and maximum 7 practical communications.Unique frequency hop sequences of piconet association is to generate according to the pseudo-random algorithm of bluetooth definition and the unique address of main equipment.Frequency hop sequences is indicated the concrete bluetooth RF channel that uses in each time slot.Because each time slot is 625 μ s, so, transmit the speed change that used bluetooth RF channel is pressed per second 1600 times.Frequency hop sequences is at random, therefore, can not show repeat pattern in short time interval, and saltus step equably on bluetooth RF channel in short time interval repeated in the very long time.
[0028] Fig. 3 also shows operating frequency overlapping of Bluetooth system and wlan system.Bluetooth system can be in saltus step from 2402 to 2480MHz whole 2.4GHz frequency band.Wlan system can be operated on the WLAN frequency channels 1,6,11, or on some other WLAN frequency channels that can use of 802.11b and 802.11g.Table 1 has been listed three WLAN frequency channels 1,6,11, the frequency range of each WLAN frequency channels, and, the bluetooth RF channel overlapping with each WLAN frequency channels.The overlapping bluetooth RF channel of each other WLAN frequency channels can be determined with similar mode with frequency range.
Table 1
The WLAN frequency channels Frequency range Bluetooth RF channel
1 2402 to 2424MHz 0 to 22
6 2425 to 2449MHz 23 to 47
11 2450 to 2474MHz 48 to 72
[0029] if Bluetooth system is operated on the identical frequency band with wlan system, so, each system all can cause interference to other system, so the performance of these two systems all can reduce.Equipment (for example, wireless device 120 shown in Figure 1 and personal computer 130) for being operated in simultaneously in Bluetooth system and the wlan system disturbs especially serious.
[0030] bluetooth is used AFH (AFH) technology, reduces contiguous mutually and is operated in the unfavorable interference effect that Bluetooth system and WLAN caused on the same frequency band.Adopt the AFH technology, the bluetooth RF channel that is subject to high-level interference no longer comes into operation, and frequency hop sequences only selects good bluetooth RF channel to carry out transfer of data.AFH makes Bluetooth system and wlan system can coexist as on the identical frequency band, realizes satisfied performance thus.
[0031] Fig. 4 shows the embodiment of the workflow 400 of the Bluetooth system that adopts the AFH technology.Flow process 400 can be carried out by the bluetooth equipment in the piconet.
[0032] at first, determine one or more tolerance (module 412) of each bluetooth RF channel.Tolerance can comprise packet error rate (PER), received signal intensity index (RSSI) etc.According to being the tolerance that each bluetooth RF channel is determined, this bluetooth RF channel can be divided into high-quality RF channel or RF channel inferior (module 414).The process that bluetooth RF channel is divided into high-quality or poor quality is called channel classification, and its implementation status is done detailed description below.
[0033] judges whether on a certain WLAN frequency channels, to have observed excessive interference (module 416).Can make such judgement according to being the tolerance that bluetooth RF channel obtains, also will be explained below.Then, structure usable bluetooth RF channel set (module 418).This set comprises not and overlapping (that is) the high-quality RF channel not therein, of any WLAN frequency channels with excessive interference.Then, revise the frequency hopping of piconet, transmit (module 420) to use usable bluetooth RF channel set.Usable bluetooth RF channel set, the frequency hop sequences of revising and/or other relevant information can exchange between all bluetooth equipments of piconet, thereby these equipment can use the frequency hop sequences of revising to transmit.
[0034] module 412 to 418 can be carried out by any bluetooth equipment in the piconet.For example, slave unit can carry out channel classification, then classified information is issued main equipment.Main equipment also can carry out channel classification.Main equipment can independently be selected final usable bluetooth RF channel set according to its classified information.Main equipment also can be selected final usable bluetooth RF channel set according to the classified information of being collected by main equipment and slave unit.
[0035] channel classification can be carried out according to various tolerance, for example, and PER, RSSI etc.PER is the ratio of quantity and the quantity of the grouping of transmission of the grouping that makes mistakes of receiving.A grouping is one group of bit, and it can send in one, three or five time slots with Bluetooth technology.Each grouping all comprises CRC (CRC) value, thereby makes receiver equipment can judge that packet decoding is correctly or wrong.The bluetooth RF channel that is subject to disturb can show high PER usually.Can in special time period, determine the PER of each bluetooth RF channel.Bluetooth RF channel with high PER can be considered RF channel inferior.
[0036] RSSI is the measurement index of received signal intensity or received power.RSSI can be used for carrying out in many ways channel classification.For example, RSSI can combine with PER, judges that given bluetooth RF channel is that high-quality is still inferior.Grouping makes mistakes and RSSI is lower if detect, and then this lower RSSI may cause that this may be interim phenomenon because propagation loss is too high.But grouping makes mistakes and RSSI is higher if detect, and then higher RSSI may cause that too by force this may be a long term phenomenon because disturb.Observe strongly disturbing bluetooth RF channel and therefore show high PER and high RSSI simultaneously.RSSI can be used for separately or combine with other tolerance being used for bluetooth RF channel is classified.
[0037] Fig. 5 shows the embodiment of the flow process 500 of dividing bluetooth RF channel.Flow process 500 comprises module 512,514,516 and 518, and they are respectively the module 412,414,416 of Fig. 4 and 418 embodiment.Flow process 500 is carried out channel classification according to PER.
[0038] at first, determine the PER (module 512) of each bluetooth RF channel.If sent the grouping of about equal number on all bluetooth channels in given Measuring Time section, then the grouping error counts of each bluetooth RF channel all can be used as the PER of this bluetooth RF channel.
[0039] module 514 is divided into high-quality or poor quality according to the PER of each bluetooth RF channel with it.In module 514, the index k with bluetooth RF channel is initialized as 0 earlier, i.e. k=0 (module 522).Then, judge that whether the PER of bluetooth RF channel k is above thresholding THB (module 524).If the answer of module 524 is a "Yes", then bluetooth RF channel k is divided into poor quality (module 526), otherwise is divided into high-quality (module 528).Then, judge whether to assess all bluetooth RF channels that are over, that is, for 79 Bluetooth systems of jumping, whether k=78 (module 530) is arranged.If answer is a "No", then increase index k (module 532), so flow process is got back to module 524, estimate next bluetooth RF channel.Otherwise if assessed all bluetooth RF channels, then flow process changes module 516 over to.
[0040] module 516 judges whether to have observed excessive interference on a certain WLAN frequency channels according to the PER of bluetooth RF channel.In general, can assess all WLAN frequency channels (as shown in Figure 5), perhaps, also can assess a part of WLAN frequency channels.For example, can only assess WLAN frequency channels 1,6,11, because their higher WLAN frequency channels that is possibilities.
[0041] in the embodiment shown in fig. 5, if with some WLAN frequency channels overlapping (that is, the mean P ER of all bluetooth RF channels therein) surpasses thresholding THw, then think this WLAN frequency channels be exist and Bluetooth system caused excessive interference.In module 516, the index m with the WLAN frequency channels is initialized as 1 earlier, i.e. m=1 (module 542).Then, determine the mean P ER (module 544) of all the bluetooth RF channels among the WLAN frequency channels m.Table 1 has shown the bluetooth RF channel in the WLAN frequency channels 1,6,11.Bluetooth RF channel in other WLAN frequency channels can be determined by similar fashion.If the number of packet that sends on all bluetooth RF channels is roughly the same, then the grouping error counts of all the bluetooth RF channels among the WLAN frequency channels m can addition, obtaining the grouping mistake sum of WLAN frequency channels m, thereby used as the mean P ER of WLAN frequency channels m.For example, the grouping error counts of bluetooth RF channel 0 to 22 can addition, to obtain the grouping mistake sum of WLAN frequency channels 1; The grouping error counts of bluetooth RF channel 23 to 47 can addition, to obtain the grouping mistake sum of WLAN frequency channels 6; The grouping error counts of bluetooth RF channel 48 to 72 can addition, to obtain the grouping mistake sum of WLAN frequency channels 11.
[0042] then, judge that whether the mean P ER of WLAN frequency channels m is above thresholding THw (module 546).If answer is a "Yes", then think WLAN frequency channels m be exist and Bluetooth system caused excessive interference.In one embodiment, be RF channel row inferior with all the bluetooth RF channel distribution among the WLAN frequency channels m that detects, even if also have some bluetooth RF channels to have low PER (module 548) in these bluetooths RF channel.If the answer of module 546 is a "No", then skip module 548.Flow process changes module 550 over to from module 546 and 548.
[0043] in module 550, judge whether to assess the WLAN frequency channels that is over all, that is, and for the m=11 whether of a lot of countries (as the U.S.).If answer is a "No", then increase index m (module 552), then, flow process is returned module 544, to assess next WLAN frequency channels.Otherwise, if assessed the WLAN frequency channels that is over all, just with all good bluetooth RF channel structure usable bluetooth RF channel sets (module 518).
[0044] in one embodiment, the thresholding TH of bluetooth RF channel BBe for obtaining the absolute value that estimated performance is selected.For example, for each bluetooth RF channel, thresholding TH BCan be made as target P ER 1%, 5% or other ratio of reaching.In another embodiment, thresholding TH BIt is the relative value of calculating according to the tolerance of determining for bluetooth RF channel.For example, thresholding TH BThe α that can be made as the mean P ER that equals all bluetooth RF channels doubly, wherein, α is for reaching the zoom factor that superperformance is selected.The thresholding TH of bluetooth RF channel BAlso can define by alternate manner.The thresholding TH of WLAN frequency channels BCan be absolute value, also can be relative value.
[0045] Fig. 6 shows the embodiment of the flow process 600 of dividing bluetooth RF channel.Flow process 600 comprises module 612,614,616 and 618, and they are respectively the module 412,414,416 of Fig. 4 and another embodiment of 418.In flow process 600, at first determine one or more tolerance (module 612) of each bluetooth RF channel, be high-quality or poor quality (module 614) to be used for each bluetooth RF channel distribution.Module 612 and module 614 can be respectively realize with module 512 and the module 514 of Fig. 5.
[0046] module 616 judges whether to have observed excessive interference on a certain WLAN frequency channels according to the quantity of bad bluetooth RF channel.Can assess all WLAN frequency channels (as shown in Figure 6), perhaps, also can assess a part of WLAN frequency channels (for example, channel 1,6,11).In the embodiment shown in fig. 6, if the quantity of the bad bluetooth RF channel in the given WLAN frequency channels surpasses thresholding TH C, then think this WLAN frequency channels be exist and Bluetooth system caused excessive interference, thresholding TH CCan be absolute value, also can be relative value.
[0047] in module 616, the index m with the WLAN frequency channels is initialized as 1 (module 642) earlier.Determine the quantity (module 644) of the bad bluetooth RF channel in the WLAN frequency channels m.Then, judge that whether the quantity of the bad bluetooth RF channel in the WLAN frequency channels m is above thresholding TH C(module 646).If answer is a "Yes", then think WLAN frequency channels m be exist and Bluetooth system caused interference, so, be poor quality (module 648) with all the bluetooth RF channel distribution in the WLAN frequency channels m.Otherwise, if the quantity of bad bluetooth RF channel is equal to or less than thresholding TH C, just skip module 648.Flow process changes module 650 over to from module 646 and 648.
[0048] in module 650, judges whether to assess the WLAN frequency channels that is over all.If answer is a "No", then increase index m (module 652), then, flow process is returned module 644, to assess next WLAN frequency channels.Otherwise flow process just changes module 618 over to, with all usable bluetooth RF channel sets of good bluetooth RF channel structure.
[0049] Fig. 7 shows the embodiment of the flow process 700 of dividing bluetooth RF channel.Flow process 700 comprises module 712,714,716 and 718, and they are respectively the module 412,414,416 of Fig. 4 and another embodiment of 418.In flow process 700, at first determine the PER and the RSSI (module 712) of each bluetooth RF channel.If the number of packet that sends at all bluetooth RF channels in given Measuring Time is roughly the same, the error counts of then dividing into groups can be used as PER.
[0050] module 714 is divided into high-quality or poor quality according to the PER and the RSSI of each bluetooth RF channel with it.In module 714, the index k with bluetooth RF channel is initialized as 0 (module 722) earlier.Then, judge that whether the PER of bluetooth RF channel k is above thresholding TH BAnd whether the RSSI of bluetooth RF channel k surpasses thresholding TH R(module 724).Thresholding TH BCan be according to the absolute thresholding of the mean P ER of all bluetooth RF channels definite (1) or (2) relative threshold.Thresholding TH RAlso can be according to the absolute thresholding of the average RSSI of all bluetooth RF channels definite (1) or (2) relative threshold.Under any circumstance, if two conditions of module 724 are very, then bluetooth RF channel k is divided into poor quality (module 726).Otherwise,, then bluetooth RF channel k is divided into high-quality (module 728) if the answer of module 724 is a "No".Then, judge whether to assess all bluetooth RF channels (module 730) that are over.If answer is a "No", then increase index k (module 732), so flow process is got back to module 724, estimate next bluetooth RF channel.Otherwise flow process changes module 716 over to.
[0051] in module 716, judges whether on a certain WLAN frequency channels, to have observed excessive interference.Module 716 can realize with the module 516 of Fig. 5, module 616 or the alternate manner of Fig. 6.Then, according to high-quality RF channel, construct usable bluetooth RF channel set (module 718).
[0052] in the specific embodiment shown in Fig. 4 to 7, bluetooth RF channel is to use PER and RSSI to classify.Bluetooth RF channel also can use other tolerance to classify, for example, and bit error rate (BER) (BER), received signal quality or the like.
[0053] Fig. 8 shows the block diagram of the embodiment of the wireless device 120 that can be simultaneously communicates with bluetooth and wlan system.Wireless device 120 can be realized the described technology of the application.
[0054] on transmission path, the data that wireless device 120 will be issued bluetooth equipment or wlan device earlier by encoder 822 handle (such as, format, encode and interweave), then by modulator (Mod) 824 do further processing (such as, modulation and scrambling), thus data chips generated.For WLAN, modulator 824 can be carried out FHSS, DSSS or OFDM modulation, for bluetooth, can carry out frequency hopping.Generally speaking, the system (for example, bluetooth, 802.11b, 802.11g or the like) that data mail to is depended in the processing of encoder 822 and modulator 824.Transmitter (TMTR) 832 finishings (such as, convert simulation, filtering, amplification and up-conversion to) data chips, generate the RF signal, launch via antenna 834 then.
[0055] on RX path, the RF signal that one or more bluetooth equipments (such as, earphone 122) and/or one or more wlan device (such as, access point 150) send is received by antenna 834 earlier, offers receiver (RCVR) 836 then.Receiver 836 is handled (for example, filtering, amplification, down-conversion and digitlization) to received signal, and generates data sampling.Demodulator (Demod) 826 processing (such as, descrambling and demodulation) data chips, thus obtain sign estimation.Decoder 828 processing (such as, deinterleaving and decoding) sign estimation, thus obtain decoded data.Decoder 828 is each decoded packet of verification also, is correctly or mistake to judge packet decoding.In general, the processing of demodulator 826 and decoder 828 is complementary to the processing of the modulator and the encoder of transmitter.Encoder 822, modulator 824, demodulator 826 and decoder 828 can be realized with modem processor 820.
[0056] operation of each processing unit in controller/processor 840 control wireless devices 120.The program code and the data of memory 842 storage wireless devices 120.The flow process 400,500,600 and/or 700 of controller/processor 840 in can execution graph 4 to 7.
[0057] Fig. 9 shows the block diagram of embodiment of the frequency hopping unit 900 of wireless device 120.Unit 900 can be implemented in modulator 824, controller 840 and/or other certain unit of wireless device 120.Used bluetooth RF channel is determined to launch in unit 900 in each time slot.
[0058] in unit 900, channel classification unit 910 receives and is used to bluetooth RF channel to derive the information of one or more tolerance.This information can comprise the information of state (for example, good or delete), received power measured value and/or other type of each decoded packet.Tolerance can be PER, RSSI, or the like.The tolerance of each bluetooth RF channel is determined according to the information of receiving in unit 910.Such as, its PER or grouping error counts can be determined according to the packet conditions of each bluetooth RF channel in unit 910.Unit 910 also according to the tolerance of bluetooth RF channel, carries out channel classification, and usable bluetooth RF is provided channel set thus.Other flow process of flow process 400,500,600,700 or channel classification is carried out in unit 910.
[0059] selected cell 912 receives the unique address of bluetooth equipment, and is created on the frequency hop sequences f that selects the different RF channel in the different time-gap HopFrequency hop sequences f HopSuppose that all bluetooth RF channels all are available, that is, do not have RF channel inferior.Whether partition sequence maker 914 generates partition sequence, should be from the available RF channel set (S that will keep with the RF channel that indicates next time slot G) or RF channel set (S inferior BK) the middle taking-up.If required, frequency remaps unit 916 with frequency hop sequences f HopThe RF channel of expression is remapped to S set GOr S BKIn the RF channel, this is determined by partition sequence.Unit 916 is provided at the correction frequency hop sequences f that selects different available RF channels in the different time-gap AdpOperating in the IEEE 802.15.1 standard that the public can know of selected cell 912 is described.Partition sequence maker 914 and frequency the operating in the IEEE802.15.2 standard that the public can know of unit 916 of remapping is described.
[0060] the channel classification technology of the application's description can be accelerated being operated in the identification of the interference source on the static frequency band.These interference sources can be wlan systems, also can be other systems.
[0061] for clarity sake, specifically described the channel classification technology around bluetooth and wlan system above.In general, these technology can be used for any communication system, as long as message transmission can emission on whole system bandwidth or selected part system bandwidth.For example, OFDM (OFDMA) system of use OFDM, single-carrier frequency division multiple access (SC-FDMA) system, other ofdm system etc. all can use these technology.OFDM is the single-carrier modulated technology that the whole system bandwidth is divided into many (K) individual orthogonal subbands.These subbands also are tone band, subcarrier, frequency range or the like.Adopt OFDM, each subband correspondence a subcarrier, can modulate data above it.The SC-FDMA system can use the FDMA that interweaves (IFDMA) to launch on the subband that is distributed on the system bandwidth, utilize local FDMA (LFDMA) on one group of adjacent sub-bands, to launch, perhaps, utilize enhancing FDMA (EFDMA) on many group adjacent sub-bands, to launch.In general, modulation symbol sends with OFDM in frequency domain, launches with SC-FDMA in time domain.The channel classification technology can be used for each subband is divided into high-quality or poor quality, and the high-quality subband can be used for launching.Adopt the system of frequency hopping and do not adopt the system of frequency hopping all can use these technology.
[0062] channel classification technology described herein can realize in various manners.For example, these technology can realize with the mode of hardware, firmware, software or their combinations.Realize that for hardware the processing unit that is used for carrying out channel can be implemented in one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processor spare (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, electronic device, is used to carry out other electronic unit or its combination of function described herein.
Realize for firmware and/or software that [0063] these technology can realize with the module (for example, process, function etc.) of carrying out function described herein.These software codes can be stored in the memory (as, the memory 842 among Fig. 8), and are carried out by processor (as, processor 840).Memory can be implemented in the processor, also can be implemented in outside the processor.
[0064] foregoing description of disclosed embodiment makes those of ordinary skills can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of this paper definition also can be applied to other embodiment on the basis that does not break away from spirit of the present invention or protection range.Therefore, the present invention is not limited to the embodiment that this paper provides, but consistent with the widest scope that meets principle disclosed herein and novel feature.

Claims (27)

1. first system=bluetooth
Second system=WLAN
1, a kind of device comprises:
At least one processor is used for:
Determine at least a tolerance of a plurality of radio frequencies (RF) channel in first communication system;
According at least a tolerance of a plurality of RF channels in described first system, judge whether on a certain frequency channels of second communication system, to have observed excessive interference;
Construct the available RF channel set of described first system, wherein, described set will foreclose with the overlapping RF channel of any frequency channels with excessive interference;
Memory is coupled with described at least one processor.
2, device according to claim 1, wherein, described at least one processor is used for determining the packet error rate (PER) of each RF channel.
3, device according to claim 1, wherein, described at least one processor is used for determining the received signal intensity index (RSSI) of each RF channel.
4, device according to claim 1, wherein, described first system carries out bluetooth, and described second system carries out IEEE 802.11 standards.
5, device according to claim 1, wherein, described at least one processor is high-quality RF channel or RF channel inferior according at least a tolerance of each RF channel with described RF channel distribution.
6, device according to claim 1, wherein, if the packet error rate of a RF channel (PER) surpasses thresholding, so, described at least one processor is a RF channel inferior with described RF channel distribution, otherwise, is divided into high-quality RF channel.
7, device according to claim 6, wherein, described at least one processor is used for described thresholding is made as predetermined value.
8, device according to claim 6, wherein, described at least one processor is provided with described thresholding according to the mean P ER of described a plurality of RF channels.
9, device according to claim 1, wherein, described at least one processor is high-quality RF channel or RF channel inferior according to the packet error rate (PER) and the received signal intensity index (RSSI) of each RF channel with described RF channel distribution.
10, device according to claim 9, wherein, for each RF channel, described at least one processor is carried out following operation:
If the PER of described RF channel surpasses the RSSI of first thresholding and described RF channel and surpasses second thresholding, is RF channel inferior with described RF channel distribution then;
Otherwise, be high-quality RF channel with described RF channel distribution.
11, device according to claim 10, wherein, described at least one processor is provided with described second thresholding according to the average RSSI of described a plurality of RF channels.
12, device according to claim 1, wherein, described at least one processor according to at least one frequency channels of described second system in the average packet error rate (PER) of the overlapping RF channel of each frequency channels, judge and on described frequency channels, whether observed excessive interference.
13, device according to claim 5, wherein, described at least one processor is judged and whether observed excessive interference on described frequency channels according to the quantity of the RF channel inferior in each frequency channels at least one frequency channels of described second system.
14, device according to claim 4, wherein, described at least one processor judges on each frequency channels in the frequency channels 1,6 and 11 of described second system whether observed excessive interference according at least a tolerance of described a plurality of RF channels.
15, device according to claim 1, wherein, described at least one processor is revised the frequency modulation sequence of described first system, thus saltus step and avoid other RF channel that described set excludes on described available RF channel set.
16, a kind of method comprises:
Determine at least a tolerance of a plurality of radio frequencies (RF) channel in first communication system;
According at least a tolerance of a plurality of RF channels in described first system, judge whether on a certain frequency channels of second communication system, to have observed excessive interference;
Construct the available RF channel set of described first system, wherein, described set will foreclose with the overlapping RF channel of any frequency channels with excessive interference.
17, method according to claim 16 also comprises:
According at least a tolerance of each RF channel, be high-quality RF channel or RF channel inferior with described RF channel distribution.
18, method according to claim 17 wherein, judges whether to have observed excessive interference and comprises on a certain frequency channels:
According to the quantity of the RF channel inferior in each frequency channels at least one frequency channels of described second system, judge and on described frequency channels, whether observed excessive interference.
19, method according to claim 16 wherein, judges whether to have observed excessive interference and comprises on a certain frequency channels:
According to at least one frequency channels of described second system in the average packet error rate (PER) of the overlapping RF channel of each frequency channels, judge and on described frequency channels, whether observed excessive interference.
20, a kind of device comprises:
Determine the module of at least a tolerance of a plurality of radio frequencies (RF) channel in first communication system;
Judge whether on a certain frequency channels of second communication system, to have observed the module of excessive interference according at least a tolerance of a plurality of RF channels in described first system;
Construct the module of the available RF channel set of described first system, wherein, described set will foreclose with the overlapping RF channel of any frequency channels with excessive interference.
21, device according to claim 20 also comprises:
According at least a tolerance of each the RF channel module that is high-quality RF channel or RF channel inferior with described RF channel distribution.
22, device according to claim 21 wherein, judges whether that the module of having observed excessive interference on a certain frequency channels comprises:
Quantity according to the RF channel inferior in each frequency channels at least one frequency channels of described second system is judged the module of whether having observed excessive interference on described frequency channels.
23, device according to claim 20 wherein, judges whether that the module of having observed excessive interference on a certain frequency channels comprises:
According to at least one frequency channels of described second system in the average packet error rate (PER) of the overlapping RF channel of each frequency channels judge the module of on described frequency channels, whether having observed excessive interference.
24, a kind of processor readable medium, storing the instruction of operating below in wireless device, carrying out above:
Determine at least a tolerance of a plurality of radio frequencies (RF) channel in first communication system;
According at least a tolerance of a plurality of RF channels in described first system, judge whether on a certain frequency channels of second communication system, to have observed excessive interference;
Construct the available RF channel set of described first system, wherein, described set will foreclose with the overlapping RF channel of any frequency channels with excessive interference.
25, processor readable medium according to claim 24, also storing the instruction of carrying out following operation above:
According at least a tolerance of each RF channel, be high-quality RF channel or RF channel inferior with described RF channel distribution.
26, processor readable medium according to claim 25, also storing the instruction of carrying out following operation above:
According to the quantity of the RF channel inferior in each frequency channels at least one frequency channels of described second system, judge and on described frequency channels, whether observed excessive interference.
27, processor readable medium according to claim 24, also storing the instruction of carrying out following operation above:
According to at least one frequency channels of described second system in the average packet error rate (PER) of the overlapping RF channel of each frequency channels, judge and on described frequency channels, whether observed excessive interference.
CNA2007800045142A 2006-02-06 2007-02-05 Method and apparatus for detecting interference in a wireless communication system Pending CN101379783A (en)

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