CN105611541A - Method and system for realizing fair coexistence of LTE (Long Term Evolution) and Wi-Fi on unauthorized frequency band - Google Patents
Method and system for realizing fair coexistence of LTE (Long Term Evolution) and Wi-Fi on unauthorized frequency band Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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Abstract
The invention discloses a method and system for realizing fair coexistence of LTE(Long Term Evolution) and Wi-Fi, belonging to the technical field of wireless communication. The system comprises a frequency band occupation detection module, a usable frequency spectrum calculation module and an MAC layer usable physical resource setting module. The method comprises the following steps: retrieving signals on an unauthorized frequency band; obtaining information of a frequency band occupied by Wi-Fi signals by an LTE base station end; taking the frequency band occupied by a Wi-Fi system and the limitation of the LTE to physical resource blocks into consideration, calculating the uplink and downlink usable physical resource blocks of an LTE system; sending to an LTE user terminal; adding usable resource block limitation to the mapping from virtual resource blocks to physical resource blocks of MAC layer of the LTE base station end; and transmitting the mapping to the LTE terminal through a control signaling. According to the method and the system, the fair coexistence of LTE and Wi-Fi on the unauthorized frequency band is realized by only adding a simple coexistence module in the LTE system; and the method and the system are compatible with the service mode of the existing LTE access network.
Description
Technical field
The present invention relates to a kind of wireless communication technology field, particularly one realize LTE (LongTermEvolution) andThe method and system that Wi-Fi coexists in unauthorized frequency range justice.
Background technology
Along with the frequency spectrum resource of low-frequency range is consumed rapidly, what radio communication operator had been thrown into 5GHz sight line exempts from license frequentlyDuan Shang. In the end of the year 2013, in 3GPP wireless access network standards meetings, many companies have proposed LTE-Unlicensed (LTE-U)Concept. Expanding to unauthorized unlicensed band by the business of LTE gets on. Existing LTE system descending physical resource is drawnBe divided into time/frequency source block (reference paper: 3GPPTS36.211Version12.6.0, Release12 (2015 as shown in Figure 1July in year)); Accordingly, various countries are the Wi-Fi system assignment bandwidth difference that meets 802.11ac, as the U.S. distributes 600MHzFrequency range, and single transmission system bandwidth be 20,40,80 or 160MHz not etc.
The frequency of investigating LTE system and Wi-Fi system is used pattern, can find in the development of LTE-U, and maximum asksTopic is exactly the public domain tragedy that may exist in 5GHz frequency range with Wi-Fi, and Wi-Fi and LTE-U be as two kinds of communication systems,There is the processing problem of disturbing.
Wi-Fi is exempting to adopt the access of carrier wave perception multiple access and conflict to avoid channel access mode (CSMA/CA) in licensed band; WhenFirst Wi-Fi node is surveyed before wishing to transmit on certain physical resource, only has the channel of working as to be considered to " sky" when (interference level namely detecting is lower than a certain threshold value), node just can be allowed to carry out signal transmission; AsFruit channel be monitored to " occupied " state, node will postpone a period of time (at random) carry out signal transmission again so as not to conflict.
But LTE is for authorizing frequency range to design, so do not adopt detecting to wait channel access mode. If LTE and Wi-Fi adoptSame band transmissions, the former can exert an influence to the latter, and if LTE transmission density is larger, the latter does not probably have machineCan use physical resource to transmit. Obviously, for two kinds of radio communication services in unauthorized frequency range, above-mentioned Coexisting FieldScape is inequitable.
Publication number is 103906184 Chinese patent application " system of selection and the selection of Wi-Fi channel when LTE terminal focus coversSystem ", the system of selection of Wi-Fi channel and selection system in the time that on July 2nd, 2014 discloses a kind of LTE terminal focus coveringSystem, first it obtain the frequency band that LTE community takies, and then chooses at certain intervals Wi-Fi available frequency band. This method is with LTEBusiness is main body, has first met the business demand of LTE; Once but LTE heavy traffic need to take whole section and exempt from licenseFrequency band, Wi-Fi business will cannot access completely. It is the fair access that this method cannot realize Wi-Fi and LTE.
Publication number is that 104185187 Chinese patent application discloses on December 3rd, 2014 that " a kind of LTE and Wi-Fi coexistControl method and terminal device ". In this technical scheme: according to the frequency information of the Long Term Evolution LTE getting, judge instituteThe difference of the frequency of stating LTE and the frequency of the adopting wireless fidelity technology Wi-Fi prestoring whether within the scope of default frequency-splitting, andAccording to judged result, selection has radio-frequency channel or the selection that the LTE channel setting of LTE bandwidth loss is described LTE to haveThe radio-frequency channel that the Wi-Fi channel setting of Wi-Fi bandwidth loss is described Wi-Fi. This kind of method cannot be at LTE and Wi-FiFrequency band is realized in overlapping completely, and because the method realizes at the radio-frequency head of two kinds of business, can have a strong impact on two kinds of businessAccuracy rate and speed.
In addition the Chinese patent that publication number is 104640157 is in open a kind of " method of heterogeneous network converged on May 20th, 2015And system ", the publication number Chinese patent that is 102668665 is on September 12nd, 2012 open " frequency spectrum in heterogeneous network is understood "And the Chinese patent that publication number is 103650626 is open " operation for many RAT access module on March 19th, 2014Method and apparatus ", be all conceived to heterogeneous access networks access way, but be all conceived to adopt different data tunnels to carry out data biographyDefeated, require terminal to have multiple access capability, and can not carry out coordinate coexistence to mutual incoherent LTE and Wi-Fi business.
Summary of the invention
The object of the invention is to realize LTE and the justice of two kinds of business of Wi-Fi in unauthorized frequency range coexists, existing to solveBoth unfairnesses access situation in symbiont techn. For solving the problems of the technologies described above, the present invention proposes one and realizes LTE and Wi-FiThe method and system that two kinds of business justice in unauthorized frequency range coexists.
The invention provides the system that the justice of two kinds of business of a kind of LTE of realization and Wi-Fi in unauthorized frequency range coexists, comprising:
Frequency band takies detection module, for detection of whether busy channel of Wi-Fi system;
Usable spectrum computing module, for calculating in Wi-Fi components of system as directed or whole busy channel frequency range, LTE system canWith time/frequency source block; Described frequency spectrum computing module judges that according to the threshold value of setting Wi-Fi frequency band takies load height, whenWi-Fi frequency band takies load when low, and LTE and Wi-Fi press channeling; When Wi-Fi frequency band takies load when high, LTE withWi-Fi is by time-multiplexed; Described frequency spectrum computing module ensures that LTE system and all Wi-Fi systems are in the longest continuous biography of unitThe running time-frequency resource occupying in defeated interval is consistent;
MAC layer available physical resources arranges module, for limiting LTE base station end and LTE user terminal MAC layer can be dispatchedRunning time-frequency resource.
System of the present invention is arranged in LTE base station eNodeB, or is arranged in LTE user terminal.
Optionally, to take detection module can be LTE base station end radio system and supporting high-rise module to frequency band.
Optionally, to take detection module can be LTE system user terminal radio system and supporting high-rise module to frequency band.
The method that the LTE of realization provided by the invention and the Wi-Fi justice in unauthorized frequency range coexists, performing step is as follows:
S10. retrieve the signal in unauthorized frequency range, and obtain by LTE base station end the band information that Wi-Fi signal takies;
S20. the restriction of the frequency range shared according to Wi-Fi system, and LTE to Physical Resource Block, is calculated by LTE base station endLTE system descending and up available Physical Resource Block, and send to LTE user terminal;
S30. be the mapping of LTE base station end MAC layer virtual resource block to physical resource block, add available resource block restriction; LTEThe mapping that base station end transmits MAC layer virtual resource block to physical resource block by control signal is to LTE terminal.
Optionally, in S10, retrieve the signal in unauthorized frequency range, can be realized by LTE base station end radio system;
Optionally, in S10, retrieve the signal in unauthorized frequency range, can detect by add extra radio frequency at LTE base station endModule realizes, and radio frequency detection module carries out radio frequency reception and converts the radio-frequency current of reception to equivalent low-pass signal;
Optionally, in S10, retrieve the signal in unauthorized frequency range, can be by detecting RTS (request to send signal) or expandingThe RTS of exhibition obtains frequency spectrum occupied information;
Optionally, in S10, retrieve the signal in unauthorized frequency range, can detect and realize by LTE user terminal radio system, andReport LTE base station end by the low-frequency range control channel of LTE;
Optionally, before the signal in S10 in the unauthorized frequency range of each retrieval, can suspend the descending service of LTE base station at leastShort idle interval duration, waits for the transmission of Wi-Fi system.
Optionally, in S20, calculate LTE system uplink and descending available Physical Resource Block, can first carry out frequency domain resourceDivide, then time-domain resource is divided.
In S20, calculate LTE system uplink and descending available Physical Resource Block, performing step comprises S21～S25:
S21. according to S10 testing result, judge in unauthorized frequency range and whether take, if nothing jumps to S22; If have, jumpForward S23 to;
S22.LTE system is carried out physical source distributing according to all available resource block;
S23. the threshold value that takies load height according to the judgement Wi-Fi frequency band of testing result and setting, judges that Wi-Fi frequency band takies negativeLotus height, if low, jumps to S24; If high, jump to S25;
S24.LTE and Wi-Fi press channeling, and LTE is calculated in the restriction to usable frequency according to testing result and LTE systemThe frequency domain resource that system can be used, this resource allocation result effective time is T;
S25.LTE and Wi-Fi press time-multiplexed, according to testing result, and the restriction of LTE system to time-domain resource distribution,Calculate the time-domain resource that LTE system can be used, this resource allocation result effective time is T;
Wherein, in S24 and S25, LTE system and all Wi-Fi systems in the longest continuous transmission intercal of unit, occupy timeFrequently resource is consistent.
Advantage of the present invention and good effect are:
(1) the inventive method can, by changing the pattern of time-frequency resource allocating, realize LTE system and Wi-Fi system non-Authorize the justice of frequency range to coexist, be also also applicable to Wi-Fi base station invisible to LTE base station, but visible to LTE user terminalSituation;
(2) system of the present invention realizes simply, only need in LTE system, add the module that simply coexists just can realize and Wi-FiCoexisting of system, with the business model compatibility of existing LTE Access Network.
Brief description of the drawings
Fig. 1 is LTE system typical physical resource distribution figure;
Fig. 2 is a kind of typical deployed figure that the present invention realizes the system that LTE and Wi-Fi justice coexist;
Fig. 3 is Wi-Fi and the LTE situation sequential chart that coexists during without this mechanism;
Fig. 4 is the module composition schematic diagram that the present invention realizes LTE and the fair symbiotic system of Wi-Fi;
Fig. 5 is the state transition graph that the present invention realizes LTE and the fair coexistence method of Wi-Fi;
Fig. 6 is that the present invention realizes the typical sequential chart that the fair coexistence method of LTE and Wi-Fi moves in eNodeB;
Fig. 7 considers that Wi-Fi base station is invisible to LTE base station, but the fair coexistence method adopting when visible to user existsThe typical sequential chart moving in eNodeB.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical scheme of the present invention is elaborated.
The LTE of the description of the embodiment of the present invention based on shown in Fig. 2 and the Wi-Fi scene that coexists, arranging nearly 5GHz has 120MHzFrequency spectrum can be used, and wherein LTE system can be used 120MHz to transmit completely, also can adopt neatly frequency spectrum still less to enterRow transmission; And Wi-Fi system is once transmitted the necessary 80MHz of use frequency range, 80MHz can wantonly 4 continuous 20MHz beUnit combines.
Notice LTE downlink business that main use scenes of the present invention is frequency range around 5Hz and the Wi-Fi scene that coexists, rightIn LTE system, user's access and management, control signal transmission etc. all can be in special the completing compared with low-frequency range of LTE,Therefore the present embodiment is not considered the transmission of above-mentioned signal, and mainly considers transfer of data. But any have correlation technique to carry on the back in this areaThe people of scape, on method and system of the present invention basis, does not do any creative change, just can be in other any frequency rangeRealize coexisting of LTE uplink/downlink sub-carriers and Wi-Fi system.
Certain emitter A in following so-called first communication system produces strong/weak jamming to certain receiver B of second communication system, at thisUnder the linguistic context of embodiment, refer to that B takies in certain running time-frequency resource receives, if A sends at identical running time-frequency resource, BCannot reach/still can reach the QoS of second default.
Certain emitter A in following so-called first communication system produces strong/weak jamming to certain emitter B of second communication system, at thisUnder the linguistic context of embodiment, if B takies in certain running time-frequency resource sends, A can pass through simple spectrum energy detection sideMethod learn this section of spectrum energy much larger than/approximate white noise.
Fig. 2 is illustrated in 300 deployed environment of LTE base station the LTE user taking LTE terminal 201 as representative. LTE base stationIn 300 coverages, there are Wi-Fi base station 411 and corresponding Wi-Fi terminal 421, and Wi-Fi base station 412 and correspondenceWi-Fi terminal 422.
Wherein disturb by force Wi-Fi base station 411DuiLTE base station 300, a little less than disturb 412DuiLTE base station, Wi-Fi base station 300,Mean that base station end can, by simple technique discovery Wi-Fi base stations 411 such as spectrum energy detections, still cannot pass through frequency spectrum energyAmount detection waits simple technique to find Wi-Fi base station 412.
In addition Wi-Fi base station 411 and 412 can produce strong jamming to LTE terminal 201; LTE base station 300 is to LTE systemIn service range, reception and the transmitting apparatus of all non-LTE systems all can produce strong jamming.
When do not adopt the LTE of realization of the present invention and Wi-Fi justice to coexist method and system time, LTE and Wi-Fi system workMake situation as follows:
When situation 1. is not worked when LTE system, each Wi-Fi system adopts CSMA/CA mechanism to share according to 802.11 regulationThe running time-frequency resource of channel;
When situation 2. is carried out work when LTE system, system sequence as shown in Figure 3: LTE base station completes after the transmission of control signal,Transfer of data is carried out in unconditional seizure all available running time-frequency resource; Because LTE base station is to this frequency range within the scope of LTE system serviceOn system all have strong jamming, each Wi-Fi system, based on CSMA/CA mechanism, is infinitely kept out of the way, until LTE system is notWork, proceeds to situation 1.
The system that the justice of two kinds of business of the LTE of realization provided by the invention and Wi-Fi in unauthorized frequency range coexists, as Fig. 4 instituteShow, comprise that frequency band takies detection module 21, usable spectrum computing module 22 and MAC (MediaAccessControl) layer canModule 23 is set with physical resource. Frequency band takies detection module 21 for detection of whether busy channel of Wi-Fi system. Usable spectrumComputing module 22 is for calculating in Wi-Fi components of system as directed or all in busy channel frequency range, the running time-frequency resource that LTE system can be usedPiece. MAC layer available physical resources arranges module 23 for limiting LTE base station end and LTE user terminal MAC layer can be dispatchedRunning time-frequency resource. System of the present invention can be arranged in LTE base station eNodeB, also can be arranged in LTE user terminal.Accordingly, it can be LTE base station end radio system and supporting high-rise module that frequency band takies detection module 21, or frequency band accounts forWith detection module 21 can be LTE system subscriber terminal radio system and supporting high-rise module.
The embodiment of the present invention, introduces LTE shown in Fig. 4 and the fair symbiotic system 100 of Wi-Fi at LTE base station end, at LTE300 places, base station introduce frequency bands and take detection module 21, usable spectrum computing module 22, MAC layer available physical resources mould is setAfter piece 23, and adopt after the method that justice of the present invention coexists at LTE base station end, as shown in Figure 5, LTE systemIn system service range, each system has following several running status:
A1 normal mode 1, the conventional transmission of LTE:
In 1 continuous transmission intercal the longest, LTE system utilizes 120MHz full frequency band to carry out transfer of data;
A2 normal mode 2, the conventional transmission of Wi-Fi:
In 1 continuous transmission intercal the longest, all Wi-Fi systems adopt CSMA/CA technology to utilize the 120MHz in frequency rangeIn frequency range, carry out transfer of data taking 20MHz as unit;
B1 coexistance model 1, Wi-Fi frequency range take load when low LTE and Wi-Fi by channeling:
In front 3/4 time in 1 continuous transmission intercal the longest, all Wi-Fi systems adopt CSMA/CA technology to utilize non-Authorize the H size frequency range in frequency range to carry out transfer of data, H is at least k times of unauthorized frequency range, and the embodiment of the present invention is 80MHz.In the embodiment of the present invention, in front 3/4 time in 1 continuous transmission intercal the longest, all Wi-Fi systems adopt CSMA/CATechnology utilizes the 80MHz frequency range in frequency range to carry out transfer of data, and by the 40MHz frequency range number of LTE system utilization remainderReportedly defeated;
In rear 1/4 time in 1 continuous transmission intercal the longest, the whole unauthorized frequency ranges of LTE system utilization are carried out data biographyDefeated. In the embodiment of the present invention, in rear 1/4 time in 1 continuous transmission intercal the longest, LTE system is utilized 120MHzFull frequency band carries out transfer of data;
B2 coexistance model 2, Wi-Fi frequency range take load when high LTE and Wi-Fi by time-multiplexed:
In front 1/2 time in 1 continuous transmission intercal the longest, all Wi-Fi systems adopt the utilization of CSMA/CA technology completeThe unauthorized frequency range of portion is carried out transfer of data, in the embodiment of the present invention, utilizes the 120MHz frequency range in frequency range to carry out transfer of data,Wherein each Wi-Fi system is taking 20MHz as unit Reusespectrum;
In rear 1/2 time in 1 continuous transmission intercal the longest, the whole unauthorized frequency ranges of LTE system utilization are carried out data biographyDefeated, in the embodiment of the present invention, utilize 120MHz full frequency band to carry out transfer of data.
Wherein, in order to dispatch conveniently, setting the longest continuous transmission intercal is 8 Transmission Time Intervals (TTI), i.e. 8ms,After long continuous transmission intercal data complete, system re-uses frequency band and takies detection module 21, carries out energy measuring on full frequency band.
Wherein B1 coexistance model 1 is applicable to the state that 1-2 Wi-Fi system coexists within the scope of LTE system service.
Wherein B2 coexistance model 2 is applicable to the state that multiple Wi-Fi systems coexist within the scope of LTE system service.
Wherein consider fair factor, in coexistance model 1 and 2, LTE system and all Wi-Fi systems are the longest continuously in unitThe running time-frequency resource occupying in transmission intercal is consistent.
It should be noted that, the time-frequency shared model of coexistance model can be set according to concrete condition.
The method that the LTE realizing based on system of the present invention and the justice of Wi-Fi coexist, performing step is as follows:
S10, retrieve the signal in unauthorized frequency range, and obtain by LTE base station end the band information that Wi-Fi signal takies;
S20, the shared frequency range of consideration Wi-Fi system, and the restriction of LTE to Physical Resource Block, by LTE base station end meterCalculate LTE system descending and up available Physical Resource Block, and LTE system descending and up available Physical Resource Block are sentGive LTE user terminal;
S30, be base station end MAC layer virtual resource blocks (VRB) to the mapping of Physical Resource Block (PRB), add available moneySource piece restriction; The mapping that MAC layer virtual resource block to physical resource block transmitted by control signal in LTE base station is to LTE terminal.
Optionally, in S10, retrieve the signal in unauthorized frequency range, can be realized by LTE base station end radio system.
Optionally, in S10, retrieve the signal in unauthorized frequency range, can detect by add extra radio frequency at LTE base station endModule realizes, and radio frequency detection module carries out radio frequency reception and converts the radio-frequency current of reception to equivalent low-pass signal.
Optionally, in S10, retrieve the signal in unauthorized frequency range, can be by detecting RTS (request to send signal) or expandingThe RTS of exhibition obtains frequency spectrum occupied information.
Optionally, in S10, retrieve the signal in unauthorized frequency range, can detect and realize by LTE user terminal radio system, andReport LTE base station end by the low-frequency range control channel of LTE.
Optionally, before the signal in S10 in the unauthorized frequency range of each retrieval, can suspend the descending service of LTE base station at leastShort idle interval duration, waits for the transmission that Wi-Fi system is possible. The duration of short idle interval adopts the value specifying in LTEOr the value that adopts user to set.
Optionally, as Fig. 2, in S20, calculate LTE system uplink and descending available Physical Resource Block, can be first to frequency domainResource is divided, and then time-domain resource is divided. A kind of implementation method that the embodiment of the present invention provides is as follows:
S21. according to S10 testing result, judge in unauthorized frequency range and whether have signal to take: if nothing jumps to S22; If have,Jump to S23;
S22.LTE system is carried out physical source distributing according to all available resource block;
S23. according to testing result, judge that Wi-Fi frequency band takies load height: if low, jump to S24; If high, jump toS25；
In the embodiment of the present invention, can, by setting size between 0 to 1 threshold value k, quantitatively judge that non-LTE signal frequentlyBand takies load height, if non-LTE signal band takies the threshold value that is greater than setting than upper whole available band, thinks non-LTESignal take load high, otherwise, think take load low.
S24. according to testing result, and the restriction of LTE system to usable frequency, calculate the frequency domain resource that LTE system can be used,This resource allocation result effective time is T;
In S24, LTE and Wi-Fi press channeling, and LTE system and all Wi-Fi systems are at the longest continuous transmission intercal of unitThe running time-frequency resource inside occupying is consistent. In the embodiment of the present invention, adopt described B1 coexistance model 1.
S25. according to testing result, and the restriction that time-domain resource is distributed of LTE system, the time domain money that LTE system can be used calculatedSource, this resource allocation result effective time is T;
In S25, LTE and Wi-Fi are by time-multiplexed, and LTE system and all Wi-Fi systems are at the longest continuous transmission intercal of unitThe running time-frequency resource inside occupying is consistent. In the embodiment of the present invention, adopt described B2 coexistance model 2.
Optionally, T can be the time domain scheduling minimum particle size 1ms specifying in LTE; Also can be other setting value.
For embodiment illustrated in fig. 2, first consider the situation that 411HeLTE base station, Wi-Fi base station 300 coexists, as Fig. 5,
(1.1) LTE system before completing once transmission or detect after, through shortest time interval, utilize frequency band to take inspectionSurvey module 21, carry out energy measuring on full frequency band, if result shows that on full frequency band, nothing takies, and LTE system need to be countedWhen reportedly defeated, enter A1 normal mode 1; Exist to take if show and go to (2.1).
(1.2) Wi-Fi system adopts SCMA/CA to carry out on full frequency band, carrying out energy measuring, if result shows on full frequency bandWithout taking, and Wi-Fi system is need to carry out transfer of data time, enters A2 normal mode 2; Exist to take if show and go to (2.1).Now usable spectrum computing module 22 also works on.
(2.1) LTE base station end utilizes usable spectrum computing module 22 to analyze frequency band and takies the Wi-Fi frequency that detection module 21 obtainsSpectrum takies result, if analysis result shows that having taken frequency range is less than or equal to 80MHz, proceeds to (3.1); If analysis result showsTake frequency range and be greater than 80MHz, proceeded to (3.2);
(3.1) utilize usable spectrum computing module 22 to consider the frequency range that Wi-Fi system is shared, and LTE is to physical resourceThe restriction of piece, calculates by LTE base station end module the Physical Resource Block that LTE system descending can be used, and as restrictive condition, asksGet the mapping of LTE system descending VRB to PRB, and proceed to (4.1);
(3.2) utilize usable spectrum computing module 22 to consider the frequency range that Wi-Fi system is shared, and LTE is to physical resourceThe restriction of piece, calculates by LTE base station end module the Physical Resource Block that LTE system descending can be used, and as restrictive condition, asksGet the mapping of LTE system descending VRB to PRB, and proceed to (4.2);
(4.1) MAC layer available physical resources arranges module 23 the descending MAC layer entity of LTE arranged, total systemEnter B1 coexistance model 1;
(4.2) MAC layer available physical resources arranges module 23 the descending MAC layer entity of LTE arranged, total systemEnter B2 coexistance model 2.
Fig. 6 is the sequential chart of B2 coexistance model 2, wherein LTE and Wi-Fi timesharing connecting system. B1 coexistance model 1 sequentialScheme similar with it.
Secondly consider 412DuiLTE base station, Wi-Fi base station 300 sightless scenes, now require LTE terminal device to have frequentlyBand takies detection module 21:
(0.1) if LTE base station has data to want to send, utilizing the edge frequency range in 5GHz frequency range or utilizing other frequency rangePhysical Downlink Control Channel (PDCCH), send request frame and proceed to (0.2) to LTE user terminal;
(0.2) after a transmission reception delay, LTE terminal device utilizes frequency band to take detection module 21, at full frequency bandOn carry out energy measuring, if take, by testing result, i.e. the situation that takies on full frequency band, by 5GHz frequency rangeEdge frequency range or utilize the PDCCH of other frequency range, sends and proceeds to (1.1) to LTE base station; If without taking, pass through 5GHzEdge frequency range in frequency range or the PDCCH that utilizes other frequency range send license frame and proceed to (1.1) to LTE base station;
(1.1) LTE system before completing once transmission or detect after, through shortest time interval, utilize frequency band to take inspectionSurvey module 21, carry out energy measuring on full frequency band, if result shows that on full frequency band, nothing takies, and LTE system need to be countedWhen reportedly defeated, enter A1 normal mode 1; Exist to take if show and go to (2.1).
(1.2) Wi-Fi system adopts SCMA/CA to carry out on full frequency band, carrying out energy measuring, if result shows on full frequency bandWithout taking, and Wi-Fi system is need to carry out transfer of data time, enters A2 normal mode 2; Exist to take if show and go to (2.1).Now usable spectrum computing module 22 also works on.
(2.1) LTE base station end utilizes usable spectrum computing module 22 to analyze LTE base station and LTE terminal device frequency separatelyBand takies the frequency spectrum that detection module 21 obtains and takies result, if analysis result shows that having taken frequency range is less than or equal to 80MHz,Proceed to (3.1); If analysis result shows that having taken frequency range is greater than 80MHz, proceeds to (3.2);
(3.1) utilize usable spectrum computing module 22 to consider the frequency range that Wi-Fi system is shared, and LTE is to physical resourceThe restriction of piece, calculates by LTE base station end module the Physical Resource Block that LTE system descending can be used, and asks for LTE system descendingVRB is to the mapping of PRB, and proceeds to (4.1);
(3.2) utilize usable spectrum computing module 22 to consider the frequency range that Wi-Fi system is shared, and LTE is to physical resourceThe restriction of piece, calculates by LTE base station end module the Physical Resource Block that LTE system descending can be used, and asks for LTE system descendingVRB is to the mapping of PRB, and proceeds to (4.2);
(4.1) MAC layer available physical resources arranges module 23 the descending MAC layer entity of LTE arranged, total systemEnter B1 coexistance model 1;
(4.2) MAC layer available physical resources arranges module 23 the descending MAC layer entity of LTE arranged, total systemEnter B2 coexistance model 2.
Fig. 7 is the sequential chart of B2 coexistance model 2 under scene for this reason, now LTE and Wi-Fi timesharing connecting system. Under this sceneB1 coexistance model 1 sequential chart is similar with it.
The above is preferred embodiment of the present invention, the present invention should not be confined to this embodiment and accompanying drawing disclosed inHold. Every do not depart under spirit disclosed in this invention, complete equivalence or amendment, all fall into the scope of protection of the invention.
Claims (10)
1. realize the system that the justice of two kinds of business of LTE and Wi-Fi in unauthorized frequency range coexists, it is characterized in that instituteThe system of stating comprises as lower module:
Frequency band takies detection module, for detection of whether busy channel of Wi-Fi system;
Usable spectrum computing module, for calculating in Wi-Fi components of system as directed or all when busy channel frequency range, LTE system can be usedTime/frequency source block; Described frequency spectrum computing module judges that according to the threshold value of setting Wi-Fi frequency band takies load height, works as Wi-FiFrequency band takies load when low, and LTE and Wi-Fi press channeling; When Wi-Fi frequency band takies load when high, LTE and Wi-FiBy time-multiplexed; Described frequency spectrum computing module ensures that LTE system and all Wi-Fi systems are at the longest continuous transmission intercal of unitThe running time-frequency resource inside occupying is consistent;
MAC layer available physical resources arranges module, holds MAC layer adjustable for limiting LTE base station end and LTE user LTEThe running time-frequency resource of degree;
Described system is arranged in LTE base station eNodeB, or is arranged in LTE user terminal.
2. the system that the justice of two kinds of business of the LTE of realization according to claim 1 and Wi-Fi in unauthorized frequency range coexists,It is characterized in that, described frequency band takies detection module, is LTE base station end radio system and supporting high-rise module, orLTE user terminal radio system and supporting high-rise module.
3. realize the method that LTE and the Wi-Fi justice in unauthorized frequency range coexists, it is characterized in that, performing step is:
S10, retrieves the signal in unauthorized frequency range, obtains by LTE base station end the band information that Wi-Fi signal takies;
S20, the frequency range shared according to Wi-Fi system, and the restriction of LTE to Physical Resource Block, by LTE base station end meterCalculate LTE system descending and up available Physical Resource Block, and send to LTE user terminal;
S30, in the mapping for LTE base station end MAC layer virtual resource block to physical resource block, adds available resource block restriction;The mapping that MAC layer virtual resource block to physical resource block transmitted by control signal in LTE base station is to LTE user terminal.
4. the method that a kind of LTE of realization according to claim 3 and the justice of Wi-Fi in unauthorized frequency range coexist, itsBe characterised in that, the calculating LTE system uplink described in S20 and descending available Physical Resource Block, first carry out frequency domain resourceDivide, then time-domain resource is divided.
5. the method that the justice in unauthorized frequency range coexists according to a kind of LTE of realization described in claim 3 or 4 and Wi-Fi,It is characterized in that, the calculating LTE system uplink described in S20 and descending available Physical Resource Block, concrete steps are:
Whether S21, according to S10 testing result, judge in unauthorized frequency range and take: if nothing jumps to S22; If have, jumpForward S23 to;
S22, LTE system is carried out physical source distributing according to all available resource block;
S23, takies load threshold value k just according to the judgement Wi-Fi frequency band of testing result and setting, judges Wi-Fi frequency bandTake load height, if low, jump to S24; If high, jump to S25; K value is between 0 to 1;
S24, LTE and Wi-Fi press channeling, and the restriction to usable frequency according to testing result and LTE system is calculatedThe frequency domain resource that LTE system can be used, establishing this resource allocation result effective time is T;
S25, LTE and Wi-Fi are by time-multiplexed, and the restriction to time-domain resource distribution according to testing result and LTE system, countsCalculate the time-domain resource that LTE system can be used, establishing this resource allocation result effective time is T;
Wherein, in S24 and S25, LTE system and all Wi-Fi systems in the longest continuous transmission intercal of unit, occupy timeFrequently resource is consistent.
6. the method that a kind of LTE of realization according to claim 3 and the justice of Wi-Fi in unauthorized frequency range coexist, itsBe characterised in that the signal in the unauthorized frequency range of the retrieval described in S10 is realized by LTE base station end radio system, or passed throughAdd extra radio frequency detection module at LTE base station end and realize, radio frequency detection module carries out radio frequency reception and by the radio frequency electrical receivingCirculation changes equivalent low-pass signal into.
7. the method that a kind of LTE of realization according to claim 3 and the justice of Wi-Fi in unauthorized frequency range coexist, itsBe characterised in that, the signal in the unauthorized frequency range of the retrieval described in S10, is detected and is realized by LTE user terminal radio system, andReport LTE base station end by the low-frequency range control channel of LTE.
8. the method that a kind of LTE of realization according to claim 3 and the justice of Wi-Fi in unauthorized frequency range coexist, itsBe characterised in that, the signal in the unauthorized frequency range of the retrieval described in S10, by detecting request to send signal RTS or expansionRTS obtains frequency spectrum occupied information.
9. the method that a kind of LTE of realization according to claim 3 and the justice of Wi-Fi in unauthorized frequency range coexist, itsBe characterised in that described S10, before the signal in the unauthorized frequency range of each retrieval, suspends the descending service of LTE base station at leastThe shortest idle interval duration, waits for the transmission of Wi-Fi system.
10. the method that a kind of LTE of realization according to claim 5 and the justice of Wi-Fi in unauthorized frequency range coexist,It is characterized in that, in S20, take load when low for Wi-Fi frequency band, adopt B1 coexistance model, take for Wi-Fi frequency bandLoad when high, adopt B2 coexistance model;
Under B1 coexistance model: in front 3/4 time in 1 continuous transmission intercal the longest, all Wi-Fi systems adoptCSMA/CA technology utilizes the H frequency range in unauthorized frequency range to carry out transfer of data, and is undertaken by the remaining frequency range of LTE system utilizationTransfer of data; H is at least k times of unauthorized frequency range; In rear 1/4 time in 1 continuous transmission intercal the longest, LTEThe whole unauthorized frequency ranges of system utilization are carried out transfer of data;
Under B2 coexistance model: in front 1/2 time in 1 continuous transmission intercal the longest, all Wi-Fi systems adoptThe whole unauthorized frequency ranges of CSMA/CA technology utilization are carried out transfer of data; Rear 1/2 time in 1 continuous transmission intercal the longestIn, the whole unauthorized frequency ranges of LTE system utilization are carried out transfer of data.
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