CN105611541B - Realize the method and system of LTE and Wi-Fi fair co-existence in unauthorized frequency range - Google Patents
Realize the method and system of LTE and Wi-Fi fair co-existence in unauthorized frequency range Download PDFInfo
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- CN105611541B CN105611541B CN201510962028.8A CN201510962028A CN105611541B CN 105611541 B CN105611541 B CN 105611541B CN 201510962028 A CN201510962028 A CN 201510962028A CN 105611541 B CN105611541 B CN 105611541B
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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 present invention is a kind of method and system for realizing LTE Yu Wi-Fi fair co-existence, belongs to wireless communication technology field.This system includes that frequency band occupies detection module, usable spectrum computing module and MAC layer available physical resources setup module.The method include the steps that retrieving the signal in unauthorized frequency range, the band information that Wi-Fi signal occupies is obtained by LTE base station end；Consider the limitation of the occupied frequency range of Wi-Fi system and LTE to Physical Resource Block, calculates the available Physical Resource Block of LTE system downlink and uplink, and be sent to LTE user terminal；For the mapping of LTE base station end MAC layer virtual resource block to physical resource block, available resource block limitation is added, LTE terminal is transferred to by control signaling.The present invention realizes LTE and Wi-Fi in the fair co-existence of unauthorized frequency range, it is only necessary to which addition simply coexists module and can be achieved in LTE system, compatible with the business model of existing LTE access net.
Description
Technical field
The present invention relates to a kind of wireless communication technology field, in particular to a kind of realization LTE (Long Term
Evolution) and Wi-Fi unauthorized frequency range fair co-existence method and system.
Background technique
As the frequency spectrum resource of low-frequency range is consumed, sight has been thrown into 5GHz and has exempted to be permitted by radio communication operators
It can be in frequency range.In the end of the year 2013, in 3GPP wireless access network standards meetings, many companies propose LTE-Unlicensed (LTE-
U concept).It will be gone on the operation expanding of LTE to unauthorized unlicensed band.Existing LTE system downlink physical resource quilt
It is divided into time/frequency source block as shown in Figure 1 (reference paper: 3GPP TS 36.211Version12.6.0, Release12
(in July, 2015))；Correspondingly, various countries are the wide difference of Wi-Fi system distribution tape for meeting 802.11ac, as the U.S. distributes
600MHz bandwidth, and single transmission system bandwidth is that 20,40,80 or 160MHz is differed.
The frequency usage mode of LTE system and Wi-Fi system is investigated, it can be found that in the development of LTE-U, it is maximum
Problem is exactly and Wi-Fi public tragedy that may be present in 5GHz frequency range, i.e. Wi-Fi and LTE-U are as two kinds of communication systems,
There are problems that interfering processing.
Wi-Fi is on exempting from licensed band using the access of carrier sense multiple access and conflict avoidance channel access mode (CSMA/
CA)；It before Wi-Fi node wishes to be transmitted on some physical resource, is detected first, only when a channel is recognized
When to be " empty " (interference level namely detected is lower than a certain threshold value), node can just be allowed to carry out signal
Transmission；If channel is monitored to " occupied " state, node will postpone a period of time (random) carry out again signal transmit with
Exempt to conflict.
But LTE designs for authorized spectrum band, so not using the channel access modes such as detecting.If LTE and Wi-Fi are adopted
With the same band transmissions, the former can have an impact the latter, and if LTE transmission density is larger, the latter is likely to not have
Chance is transmitted using physical resource.It is above-mentioned to coexist for two kinds of radio communication services in unauthorized frequency range
Scene is inequitable.
Publication No. 103906184 Chinese patent application " LTE terminal hot spot cover when Wi-Fi channel selection method
And selection system ", the selection method and choosing of Wi-Fi channel when disclosing a kind of covering of LTE terminal hot spot on July 2nd, 2014
System is selected, it obtains the frequency band of LTE cell occupancy first, then chooses Wi-Fi available frequency band at certain intervals.This method with
Based on LTE business, i.e., the business demand of LTE is met first；Once but LTE heavy traffic, need to occupy whole section and exempt to be permitted
Can frequency band, then Wi-Fi business can not will access completely.I.e. this method cannot achieve the fair exchange protocols of Wi-Fi and LTE.
The Chinese patent application of Publication No. 104185187 discloses that " a kind of LTE and Wi-Fi is total on December 3rd, 2014
The control method and terminal device deposited ".In the technical solution: according to the frequency information of the long term evolution LTE got, judging institute
The difference of the frequency of LTE and the frequency of the adopting wireless fidelity technology Wi-Fi prestored is stated whether in preset frequency differential ranges, and
Being set as the radio-frequency channel of the LTE or selection according to the channel LTE that judging result selection has LTE bandwidth to lose has Wi-Fi
The channel Wi-Fi of bandwidth loss is set as the radio-frequency channel of the Wi-Fi.This kind of method can not be complete in LTE and Wi-Fi frequency band
It is realized when coincidence, and because this method is realized in the radio-frequency head of two kinds of business, the accuracy rate of two kinds of business can be seriously affected
And rate.
Furthermore the Chinese patent of Publication No. 104640157 on May 20th, 2015 it is open " a kind of heterogeneous network converged
Method and system ", Publication No. 102668665 Chinese patent on September 12nd, 2012 open " the frequency spectrum solution in heterogeneous network
The Chinese patent of reading " and Publication No. 103650626 is open " for the operation of more RAT access modules on March 19th, 2014
Method and apparatus " is all conceived to heterogeneous access networks access way, but is conceived to and carries out data using different data tunnels
Transmission, that is, requiring terminal, there are many access capabilities, and cannot carry out coordinate coexistence to irrelevant LTE and Wi-Fi business.
Summary of the invention
It is an object of the invention to realize fair co-existence of the two kinds of business of LTE and Wi-Fi in unauthorized frequency range, to solve
Unfair access situation both in existing symbiont techn.In order to solve the above technical problems, the present invention propose a kind of realization LTE and
The method and system of fair co-existence of the two kinds of business of Wi-Fi in unauthorized frequency range.
The present invention provides a kind of system of fair co-existence in unauthorized frequency range of realizing two kinds of business of LTE and Wi-Fi, packet
It includes:
Frequency band occupy detection module, for detect Wi-Fi system whether busy channel；
Usable spectrum computing module, for calculating when Wi-Fi components of system as directed or whole busy channel frequency ranges, LTE system
It unites available time/frequency source block；It is high that the frequency spectrum computing module judges that Wi-Fi frequency band occupies load according to the threshold value of setting
Low, when Wi-Fi frequency band occupancy load is low, LTE and Wi-Fi press channeling；When Wi-Fi frequency band occupy load it is high when, LTE with
Wi-Fi is temporally multiplexed；The frequency spectrum computing module guarantees that LTE system and all Wi-Fi systems are continuously passed in unit longest
The running time-frequency resource occupied in defeated interval is consistent；
MAC layer available physical resources setup module, it is schedulable for limiting LTE base station end and LTE user terminal MAC layer
Running time-frequency resource.
System of the present invention is set in LTE base station eNodeB, or is set in LTE user terminal.
Optionally, frequency band, which occupies detection module, can be LTE base station end-fire display system and mating high-rise module.
Optionally, frequency band, which occupies detection module, can be LTE system user terminal radio frequency system and mating high-rise module.
The method of fair co-existence of the realization LTE and Wi-Fi provided by the invention in unauthorized frequency range, realizes step such as
Under:
S10. the signal in unauthorized frequency range is retrieved, and the band information that Wi-Fi signal occupies is obtained by LTE base station end；
S20. the limitation according to the occupied frequency range of Wi-Fi system and LTE to Physical Resource Block, is counted by LTE base station end
The available Physical Resource Block of LTE system downlink and uplink is calculated, and is sent to LTE user terminal；
It S30. is the mapping of LTE base station end MAC layer virtual resource block to physical resource block, addition available resource block limitation；
LTE base station end is mapped to LTE terminal by control signaling transmission MAC layer virtual resource block to physical resource block.
Optionally, the signal in unauthorized frequency range is retrieved in S10, can be realized by LTE base station end-fire display system；
Optionally, the signal in unauthorized frequency range is retrieved in S10, it can be by adding additional radio frequency at LTE base station end
Detection module realizes that RF detection module carries out radio frequency reception and received radio-frequency current is converted into equivalent low-pass signal；
Optionally, the signal in unauthorized frequency range is retrieved in S10, can by detection RTS (request to send signal) or
The RTS of extension obtains Spectrum Occupancy Information；
Optionally, the signal in unauthorized frequency range is retrieved in S10, can be detected and be realized by LTE user terminal radio frequency system,
And LTE base station end is reported to by the low-frequency range control channel of LTE；
Optionally, before retrieving the signal in unauthorized frequency range in S10 every time, the downstream service of LTE base station can be suspended extremely
Few most short idle interval duration, to wait the transmission of Wi-Fi system.
Optionally, the available Physical Resource Block of LTE system uplink and downlink is calculated in S20, it can be first to frequency domain resource
It is divided, then time-domain resource is divided.
The available Physical Resource Block of LTE system uplink and downlink is calculated in S20, realizes that step includes S21~S25:
S21. according to S10 testing result, judge whether there is occupancy in unauthorized frequency range, if nothing, jump to S22；If so, jumping
Go to S23；
S22.LTE system carries out physical source distributing according to all available resource blocks；
S23. Wi-Fi frequency band is judged with the threshold value for judging Wi-Fi frequency band occupancy load height of setting according to testing result
Load height is occupied, if low, jumps to S24；If high, S25 is jumped to；
S24.LTE and Wi-Fi press channeling, according to testing result and limitation of the LTE system to usable frequency, calculate
The available frequency domain resource of LTE system, the resource allocation result effective time are T；
S25.LTE and Wi-Fi is temporally multiplexed, and according to testing result and LTE system is to the limit of time domain resource allocation
System calculates the available time-domain resource of LTE system, which is T；
Wherein, in S24 and S25, LTE system and all Wi-Fi systems are continuously transmitted in unit longest and are occupied in interval
Running time-frequency resource is consistent.
The advantages and positive effects of the present invention are:
(1) the method for the present invention can realize that LTE system and Wi-Fi system exist by the mode of change time-frequency resource allocating
It is invisible to LTE base station but visible to LTE user terminal to be also also suitable for the base station Wi-Fi for the fair co-existence of unauthorized frequency range
Situation；
(2) present system is realized simple, it is only necessary to be added in LTE system simply coexist module can be achieved with
Wi-Fi system coexists, compatible with the business model of existing LTE access net.
Detailed description of the invention
Fig. 1 is LTE system typical physical resource distribution figure；
Fig. 2 is a kind of typical deployed figure for the system that the present invention realizes LTE and Wi-Fi fair co-existence；
Wi-Fi and LTE Coexistence Situation timing diagram when Fig. 3 is no present mechanism；
Fig. 4 is the module composition schematic diagram that the present invention realizes LTE and Wi-Fi fair co-existence system；
Fig. 5 is the state transition graph that the present invention realizes LTE and Wi-Fi fair co-existence method；
Fig. 6 is the exemplary timing diagram that the present invention realizes that LTE and Wi-Fi fair co-existence method are run in the enodeb；
Fig. 7 is to consider that the base station Wi-Fi is invisible to LTE base station, but exist to the fair co-existence method that user uses when visible
The exemplary timing diagram run in eNodeB.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawings and examples.
The description of the embodiment of the present invention is based on LTE and Wi-Fi coexistence scenario shown in Fig. 2, and arranging nearly 5GHz has 120MHz
Frequency spectrum is available, and wherein LTE system can be transmitted using 120MHz completely, can also neatly be carried out using less frequency spectrum
Transmission；And Wi-Fi system once transmit must use 80MHz frequency range, 80MHz can wantonly 4 continuous 20MHz be unit combine
It forms.
Notice that main usage scenario of the invention is the LTE downlink business and Wi-Fi Coexisting Field of the frequency range around 5Hz
Scape, for LTE system, the access and management of user, control signaling transmission etc. can be dedicated complete compared with low-frequency range in LTE
At, therefore the present embodiment does not consider the transmission of above-mentioned signal, and mainly consider data and transmit.But any there is related skill in this field
The people of art background does not do any creative change, so that it may other any on the basis of method and system of the present invention
Coexisting for LTE uplink/downlink sub-carriers and Wi-Fi system is realized in frequency range.
Certain transmitter A in following so-called first communication systems generates strong/weak jamming to certain receiver B of second communication system,
Under the context of the present embodiment, refer to that B is occupied when certain running time-frequency resource received, if A is sent in identical running time-frequency resource,
B is unable to reach/still can reach the QoS of second default.
Certain transmitter A in following so-called first communication systems generates strong/weak jamming to certain transmitter B of second communication system,
Under the context of the present embodiment, if B is occupied when certain running time-frequency resource sent, A can be examined by simple spectrum energy
Survey method learns that this section of spectrum energy be much larger than/is approximately equal to white noise.
Fig. 2 indicates the LTE user for having with LTE terminal 201 for representative in 300 deployed environment of LTE base station.LTE base station 300
There are the base station Wi-Fi 411 and corresponding Wi-Fi terminal 421 and the base station Wi-Fi 412 and corresponding Wi-Fi whole in coverage area
End 422.
Wherein LTE base station 300 is interfered by force in the base station Wi-Fi 411, the base station Wi-Fi 412 LTE base station 300 is interfered it is weak, i.e.,
Mean that base station end can find the base station Wi-Fi 411 by simple techniques such as spectrum energy detections, but frequency spectrum energy can not be passed through
The simple techniques such as amount detection find the base station Wi-Fi 412.
Furthermore the base station Wi-Fi 411 and 412 can generate strong jamming to LTE terminal 201；LTE base station 300 takes LTE system
All non-LTE systems sends and receivees equipment and can all generate strong jamming in business range.
When not using the method and system of realization LTE and Wi-Fi fair co-existence of the present invention, LTE and Wi-Fi system
Working condition is as follows:
For situation 1. when LTE system does not work, each Wi-Fi system is total using CSMA/CA mechanism according to 802.11 regulation
Enjoy the running time-frequency resource of channel；
For situation 2. when LTE system is worked, system sequence is as shown in Figure 3: the transmission of LTE base station completion control signaling
Afterwards, all available running time-frequency resource carries out data transmission for unconditional seizure；Since LTE base station is somebody's turn to do in LTE system service range
System in frequency range has a strong jamming, and each Wi-Fi system is based on CSMA/CA mechanism, is infinitely kept out of the way, until LTE system not
Work, is transferred to situation 1.
The system of fair co-existence of the realization two kinds of business of LTE and Wi-Fi provided by the invention in unauthorized frequency range, such as schemes
Shown in 4, including frequency band occupies detection module 21, usable spectrum computing module 22 and MAC (Media Access Control)
Layer available physical resources setup module 23.Frequency band occupy detection module 21 for detect Wi-Fi system whether busy channel.It can use
Frequency spectrum computing module 22 is for calculating when Wi-Fi components of system as directed or whole busy channel frequency ranges, the available time-frequency of LTE system
Resource block.MAC layer available physical resources setup module 23 is used to limit LTE base station end and LTE user terminal MAC layer is schedulable
Running time-frequency resource.Present system can be set in LTE base station eNodeB, also can be set in LTE user terminal.Accordingly
, frequency band, which occupies detection module 21, can be LTE base station end-fire display system and mating high-rise module, alternatively, frequency band occupies detection
Module 21 can be LTE system user terminal radio frequency system and mating high-rise module.
The embodiment of the present invention introduces the system of LTE and Wi-Fi fair co-existence shown in Fig. 4 100 at LTE base station end, i.e., in LTE
Frequency band is introduced at base station 300 occupies detection module 21, usable spectrum computing module 22, MAC layer available physical resources setup module
After 23, and after method of the LTE base station end using fair co-existence of the present invention, then as shown in figure 5, LTE system service
Each system has following several operating status in range:
A1 normal mode 1, LTE normal transmissions:
It is continuously transmitted in interval in 1 longest, LTE system is carried out data transmission using 120MHz full frequency band；
A2 normal mode 2, Wi-Fi normal transmissions:
It is continuously transmitted in interval in 1 longest, all Wi-Fi systems are using CSMA/CA technology using in frequency range
In 120MHz frequency range, carried out data transmission as unit of 20MHz；
B1 coexistance model 1, LTE and Wi-Fi presses channeling when Wi-Fi frequency range occupancy load is low:
Before 1 longest continuously transmits in interval in 3/4 time, all Wi-Fi systems are utilized using CSMA/CA technology
H size frequency range in unauthorized frequency range carries out data transmission, and 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, before 1 longest continuously transmits in interval in 3/4 time, all Wi-Fi systems are used
CSMA/CA technology is carried out data transmission using the 80MHz frequency range in frequency range, and by LTE system using remaining 40MHz frequency range into
The transmission of row data；
Within rear 1/4 time that 1 longest continuously transmits in interval, LTE system is counted using all unauthorized frequency ranges
According to transmission.In the embodiment of the present invention, within rear 1/4 time that 1 longest continuously transmits in interval, LTE system utilizes 120MHz
Full frequency band carries out data transmission；
B2 coexistance model 2, LTE and Wi-Fi is temporally multiplexed when Wi-Fi frequency range occupancy load is high:
Before 1 longest continuously transmits in interval in 1/2 time, all Wi-Fi systems are utilized using CSMA/CA technology
All unauthorized frequency range carries out data transmission, i.e., carries out data biography using the 120MHz frequency range in frequency range in the embodiment of the present invention
It is defeated, wherein each Wi-Fi system is using 20MHz as unit Reusespectrum；
Within rear 1/2 time that 1 longest continuously transmits in interval, LTE system is counted using all unauthorized frequency ranges
According to transmission, i.e., carried out data transmission in the embodiment of the present invention using 120MHz full frequency band.
Wherein in order to dispatch conveniently, sets and be divided into 8 Transmission Time Intervals (TTI) between longest continuously transmits, i.e. 8ms,
After the completion of longest continuously transmits interval data, system re-uses frequency band and occupies detection module 21, and energy is carried out on full frequency band
Detection.
Wherein B1 coexistance model 1 is suitable for the state that 1-2 Wi-Fi system coexists in LTE system service range.
Wherein B2 coexistance model 2 is suitable for the state that multiple Wi-Fi systems coexist in LTE system service range.
Wherein in view of fair factor, in coexistance model 1 and 2, LTE system and all Wi-Fi systems connect in unit longest
The running time-frequency resource occupied in continuous 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 of the fair co-existence of the LTE and Wi-Fi that are realized based on present system realizes that steps are as follows:
Signal on S10, the unauthorized frequency range of retrieval, and the band information that Wi-Fi signal occupies is obtained by LTE base station end；
S20, consider the limitation of the occupied frequency range of Wi-Fi system and LTE to Physical Resource Block, counted by LTE base station end
The available Physical Resource Block of LTE system downlink and uplink is calculated, and the available Physical Resource Block of LTE system downlink and uplink is sent
Give LTE user terminal；
S30, the mapping that Physical Resource Block (PRB) is arrived for base station end MAC layer virtual resource blocks (VRB), add available resources
Block limitation；LTE base station is mapped to LTE terminal by control signaling transmission MAC layer virtual resource block to physical resource block.
Optionally, the signal in unauthorized frequency range is retrieved in S10, can be realized by LTE base station end-fire display system.
Optionally, the signal in unauthorized frequency range is retrieved in S10, it can be by adding additional radio frequency at LTE base station end
Detection module realizes that RF detection module carries out radio frequency reception and received radio-frequency current is converted into equivalent low-pass signal.
Optionally, the signal in unauthorized frequency range is retrieved in S10, can by detection RTS (request to send signal) or
The RTS of extension obtains Spectrum Occupancy Information.
Optionally, the signal in unauthorized frequency range is retrieved in S10, can be detected and be realized by LTE user terminal radio frequency system,
And LTE base station end is reported to by the low-frequency range control channel of LTE.
Optionally, before retrieving the signal in unauthorized frequency range in S10 every time, the downstream service of LTE base station can be suspended extremely
Few most short idle interval duration, to wait the possible transmission of Wi-Fi system.The duration of most short idle interval uses to be provided in LTE
Value or use value set by user.
Optionally, such as Fig. 2, the available Physical Resource Block of LTE system uplink and downlink is calculated in S20, it can be first to frequency
Domain resource is divided, and is then divided to time-domain resource.A kind of implementation method provided in an embodiment of the present invention is as follows:
S21. according to S10 testing result, judge whether there is signal occupancy in unauthorized frequency range: if nothing, jumping to S22；If
Have, jumps to S23；
S22.LTE system carries out physical source distributing according to all available resource blocks；
S23. according to testing result, judge that Wi-Fi frequency band occupies load height: if low, jumping to S24；If high, jump to
S25；
It can carry out the non-LTE signal of rational judgment by one size of setting between 0 to 1 threshold value k in the embodiment of the present invention
Frequency band occupies load height, i.e., if non-LTE signal band occupies the threshold value for being greater than setting than upper whole available bands, it is believed that non-
LTE signal occupies load height, on the contrary, it is believed that it is low to occupy load.
S24. according to testing result and limitation of the LTE system to usable frequency, the available frequency domain money of LTE system is calculated
Source, the resource allocation result effective time are T；
LTE and Wi-Fi presses channeling in S24, and LTE system and all Wi-Fi systems are between unit longest continuously transmits
It is consistent every the interior running time-frequency resource occupied.The B1 coexistance model 1 is used in the embodiment of the present invention.
S25. according to testing result and limitation of the LTE system to time domain resource allocation, calculate LTE system it is available when
Domain resource, the resource allocation result effective time are T；
LTE and Wi-Fi is temporally multiplexed in S25, and LTE system and all Wi-Fi systems are between unit longest continuously transmits
It is consistent every the interior running time-frequency resource occupied.The B2 coexistance model 2 is used in the embodiment of the present invention.
Optionally, domain scheduling minimum particle size 1ms when T can be specified in LTE；It is also possible to other setting values.
For embodiment illustrated in fig. 2, the case where consideration base station Wi-Fi 411 and LTE base station 300 coexist first, such as Fig. 5,
(1.1) it after LTE system is once transmitted or detected before completion, by shortest time interval, is accounted for using frequency band
With detection module 21, energy measuring is carried out on full frequency band, if as the result is shown on full frequency band without occupancy, and LTE system need into
When row data are transmitted, into A1 normal mode 1；(2.1) are gone to if showing in the presence of occupying.
(1.2) Wi-Fi system carries out energy measuring using SCMA/CA progress on full frequency band, if full frequency band as the result is shown
On without occupancy, and when Wi-Fi system needs to carry out data transmission, into A2 normal mode 2；It is gone to if showing in the presence of occupying
(2.1).Usable spectrum computing module 22 also works at this time.
(2.1) LTE base station end analyzes frequency band using usable spectrum computing module 22 and occupies the Wi-Fi that detection module 21 obtains
Frequency spectrum occupies as a result, if analysis has occupied frequency range less than or equal to 80MHz as the result is shown, is transferred to (3.1)；If analysis is as the result is shown
Frequency range has been occupied greater than 80MHz, then has been transferred to (3.2)；
(3.1) consider that the occupied frequency range of Wi-Fi system and LTE provide physics using usable spectrum computing module 22
The limitation of source block calculates the available Physical Resource Block of LTE system downlink by LTE base station end module, and as restrictive condition, asks
The mapping of LTE system downlink VRB to PRB is taken, and is transferred to (4.1)；
(3.2) consider that the occupied frequency range of Wi-Fi system and LTE provide physics using usable spectrum computing module 22
The limitation of source block calculates the available Physical Resource Block of LTE system downlink by LTE base station end module, and as restrictive condition, asks
The mapping of LTE system downlink VRB to PRB is taken, and is transferred to (4.2)；
(4.1) MAC layer available physical resources setup module 23 is configured LTE downlink MAC layer entity, total system into
Enter B1 coexistance model 1；
(4.2) MAC layer available physical resources setup module 23 is configured LTE downlink MAC layer entity, total system into
Enter B2 coexistance model 2.
Fig. 6 is the timing diagram of B2 coexistance model 2, wherein LTE and Wi-Fi timesharing access system.1 timing diagram of B1 coexistance model
It is similar therewith.
Secondly consider that the base station Wi-Fi 412 to the sightless scene of LTE base station 300, requires LTE terminal equipment to possess at this time
Frequency band occupies detection module 21:
(0.1) edge frequency range or the other frequencies of utilization if LTE base station has data to want to send, in utilization 5GHz frequency range
The Physical Downlink Control Channel (PDCCH) of section emits to LTE user terminal and sends claim frame and be transferred to (0.2)；
(0.2) after a transmitting and receiving is delayed, LTE terminal equipment utilization frequency band occupies detection module 21, complete
Energy measuring is carried out in frequency range, if there is occupancy, will test the occupancy situation as a result, i.e. on full frequency band, by 5GHz frequency range
Edge frequency range or using other frequency ranges PDCCH, sent to LTE base station and be transferred to (1.1)；If passing through 5GHz without occupancy
Edge frequency range in frequency range sends license frame to LTE base station using the PDCCH of other frequency ranges and is transferred to (1.1)；
(1.1) it after LTE system is once transmitted or detected before completion, by shortest time interval, is accounted for using frequency band
With detection module 21, energy measuring is carried out on full frequency band, if as the result is shown on full frequency band without occupancy, and LTE system need into
When row data are transmitted, into A1 normal mode 1；(2.1) are gone to if showing in the presence of occupying.
(1.2) Wi-Fi system carries out energy measuring using SCMA/CA progress on full frequency band, if full frequency band as the result is shown
On without occupancy, and when Wi-Fi system needs to carry out data transmission, into A2 normal mode 2；It is gone to if showing in the presence of occupying
(2.1).Usable spectrum computing module 22 also works at this time.
(2.1) LTE base station is analyzed using usable spectrum computing module 22 in LTE base station end and LTE terminal equipment is respective
Frequency band occupies the obtained frequency spectrum of detection module 21 and occupies as a result, if analysis has occupied frequency range less than or equal to 80MHz as the result is shown,
It is transferred to (3.1)；If analysis has occupied frequency range greater than 80MHz as the result is shown, it is transferred to (3.2)；
(3.1) consider that the occupied frequency range of Wi-Fi system and LTE provide physics using usable spectrum computing module 22
The limitation of source block calculates the available Physical Resource Block of LTE system downlink by LTE base station end module, and seeks LTE system downlink
The mapping of VRB to PRB, and it is transferred to (4.1)；
(3.2) consider that the occupied frequency range of Wi-Fi system and LTE provide physics using usable spectrum computing module 22
The limitation of source block calculates the available Physical Resource Block of LTE system downlink by LTE base station end module, and seeks LTE system downlink
The mapping of VRB to PRB, and it is transferred to (4.2)；
(4.1) MAC layer available physical resources setup module 23 is configured LTE downlink MAC layer entity, total system into
Enter B1 coexistance model 1；
(4.2) MAC layer available physical resources setup module 23 is configured LTE downlink MAC layer entity, total system into
Enter B2 coexistance model 2.
Fig. 7 thus under scene B2 coexistance model 2 timing diagram, the access system of LTE and Wi-Fi timesharing at this time.Under this scene
1 timing diagram of B1 coexistance model is similar therewith.
The above is presently preferred embodiments of the present invention, and it is public that the present invention should not be limited to embodiment and attached drawing institute
The content opened.It is all not depart from the lower equivalent or modification completed of spirit disclosed in this invention, both fall within the model that the present invention protects
It encloses.
Claims (9)
1. a kind of system for the fair co-existence in unauthorized frequency range of realizing two kinds of business of LTE and Wi-Fi, which is characterized in that institute
The system of stating includes following module:
Frequency band occupy detection module, for detect Wi-Fi system whether busy channel；
Usable spectrum computing module, for calculating in Wi-Fi components of system as directed or whole busy channel frequency ranges, LTE system is available
Time/frequency source block；The frequency spectrum computing module judges that Wi-Fi frequency band occupies load height according to the threshold value of setting, when
When Wi-Fi frequency band occupancy load is low, LTE and Wi-Fi press channeling；When Wi-Fi frequency band occupancy load is high, LTE and Wi-Fi
Temporally it is multiplexed；The frequency spectrum computing module guarantees that LTE system and all Wi-Fi systems continuously transmit interval in unit longest
The running time-frequency resource inside occupied is consistent；
MAC layer available physical resources setup module, for limit LTE base station end and the end LTE user LTE MAC layer it is schedulable when
Frequency resource；
The system is arranged in LTE base station eNodeB, or is set in LTE user terminal.
2. fair co-existence of the realization two kinds of business of LTE and Wi-Fi according to claim 1 in unauthorized frequency range is
System, which is characterized in that the frequency band occupies detection module, is LTE base station end-fire display system and mating high-rise module, either
LTE user terminal radio frequency system and mating high-rise module.
3. a kind of method for the fair co-existence in unauthorized frequency range of realizing LTE and Wi-Fi, which is characterized in that realize step are as follows:
S10 retrieves the signal in unauthorized frequency range, obtains the band information that Wi-Fi signal occupies by LTE base station end；
S20, the limitation according to the occupied frequency range of Wi-Fi system and LTE to Physical Resource Block, is calculated by LTE base station end
The available Physical Resource Block of LTE system downlink and uplink, and it is sent to LTE user terminal；Specific steps are as follows:
S21 judges whether there is occupancy in unauthorized frequency range: if nothing, jumping to S22 according to S10 testing result；If so, jumping to
S23；
S22, LTE system carry out physical source distributing according to all available resource blocks；
S23, according to testing result with setting judge Wi-Fi frequency band occupy load height threshold value k, to judge Wi-Fi frequency band
Load height is occupied, if low, jumps to S24；If high, S25 is jumped to；K value is between 0 to 1；
S24, LTE and Wi-Fi press channeling, according to testing result and limitation of the LTE system to usable frequency, calculate LTE
The available frequency domain resource of system, if the resource allocation result effective time is T；
S25, LTE and Wi-Fi are temporally multiplexed, and according to testing result and limitation of the LTE system to time domain resource allocation, are calculated
The available time-domain resource of LTE system, if the resource allocation result effective time is T；
Wherein, in S24 and S25, LTE system and all Wi-Fi systems continuously transmit the time-frequency occupied in interval in unit longest
Resource is consistent；
S30 is addition available resource block limitation in the mapping of LTE base station end MAC layer virtual resource block to physical resource block；LTE
Base station is mapped to LTE user terminal by control signaling transmission MAC layer virtual resource block to physical resource block.
4. a kind of method of fair co-existence in unauthorized frequency range of realizing LTE and Wi-Fi according to claim 3,
It is characterized in that, the available Physical Resource Block of calculating LTE system uplink and downlink described in S20, frequency domain resource is carried out first
It divides, then time-domain resource is divided.
5. a kind of method of fair co-existence in unauthorized frequency range of realizing LTE and Wi-Fi according to claim 3,
Be characterized in that, the signal in the unauthorized frequency range of retrieval described in S10 is realized by LTE base station end-fire display system, or by
LTE base station end is added additional RF detection module and is realized, RF detection module carries out radio frequency reception and by received radio frequency electrical
Circulation changes equivalent low-pass signal into.
6. a kind of method of fair co-existence in unauthorized frequency range of realizing LTE and Wi-Fi according to claim 3,
It is characterized in that, the signal in the unauthorized frequency range of retrieval described in S10 is detected by LTE user terminal radio frequency system and realized, and led to
The low-frequency range control channel for crossing LTE is reported to LTE base station end.
7. a kind of method of fair co-existence in unauthorized frequency range of realizing LTE and Wi-Fi according to claim 3,
It is characterized in that, the signal in the unauthorized frequency range of retrieval described in S10, passes through detection request to send signal RTS or extension
RTS obtains Spectrum Occupancy Information.
8. a kind of method of fair co-existence in unauthorized frequency range of realizing LTE and Wi-Fi according to claim 3,
It is characterized in that, the S10, before retrieving the signal in unauthorized frequency range every time, suspends the downstream service of LTE base station at least most
Short idle interval duration, to wait the transmission of Wi-Fi system.
9. a kind of method of fair co-existence in unauthorized frequency range of realizing LTE and Wi-Fi according to claim 3,
It is characterized in that, when low for Wi-Fi frequency band occupancy load in S20, using B1 coexistance model, load is occupied for Wi-Fi frequency band
Gao Shi, using B2 coexistance model；
Under B1 coexistance model: before 1 longest continuously transmits in interval in 3/4 time, all Wi-Fi systems use CSMA/
CA technology is carried out data transmission using the H frequency range in unauthorized frequency range, and carries out data biography using remaining frequency range by LTE system
It is defeated；H is at least k times of unauthorized frequency range；Within rear 1/4 time that 1 longest continuously transmits in interval, LTE system is using entirely
The unauthorized frequency range in portion carries out data transmission；
Under B2 coexistance model: before 1 longest continuously transmits in interval in 1/2 time, all Wi-Fi systems use CSMA/
CA technology is carried out data transmission using all unauthorized frequency ranges；Within rear 1/2 time that 1 longest continuously transmits in interval, LTE
System is carried out data transmission using all unauthorized frequency ranges.
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