CN105392144A - Method and apparatus for multiplexing channel of unlicensed frequency band - Google Patents
Method and apparatus for multiplexing channel of unlicensed 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
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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Abstract
The embodiment of the invention provides a method and apparatus for multiplexing a channel of an unlicensed frequency band. The method comprises the following steps that: when data to be transmitted exist, channel energy in a detection frame is detected, and the proportion alpha of the occupation time of a current Wi-Fi station on a channel in the detection frame is obtained; the first number of sub frames in a first transmission frame which are occupied by an LAA base station in a transmission period is obtained according to the alpha, the service type of the data to be transmitted and a first preset formula, and the sub frames of the first number are adopted to perform data transmission; and the second number of sub frames in an another transmission frame which are occupied by the LAA base station is determined according to the number of confirmation messages which are obtained after the data in the previous transmission frame are transmitted, and a second preset formula, and the sub frames of the second number are adopted to perform data transmission. With the method and apparatus of the invention adopted, fairness and efficiency of channel multiplexing of the LAA base station and the Wi-Fi station can be considered.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of channel multiplexing method of unauthorized frequency range and device.
Background technology
Along with the sharp increase of Mobile data demand and Consumer's Experience demand, existing Long Term Evolution LTE system is day by day difficult to meet the demands, industrial quarters and academia propose multiple method and solve this problem, wherein the unauthorized frequency range allowing LTE take 2.4G and 5G by the method extensively approved, and with original technology harmonious coexistence.Technology in these frequency ranges mainly contains Wireless Fidelity WiFi, bluetooth Bluetooth and ZigBee protocol ZigBee etc.Here we mainly consider WiFi.The pattern that this LTE and WiFi coexists in unauthorized frequency range is referred to as LTE-Unlicensed, is called for short LTE-U, is also called LAA (LicensedAssistedAccess authorizes and assists access) usingLTE.
Have two to the basic demand of LAA, one is can occupy unauthorized frequency range to increase transmission bandwidth, and two is can not have excessive interference to WiFi.As a kind of supplementary functions of LTE, when the service distributing of LTE base station is to after LAA base station, transmission and LAA that LTE is authorizing frequency range can be carried out in the transmission of unauthorized frequency range simultaneously, thus improve utilized spectral bandwidth and the transmission rate of whole LTE.The feature of LAA is, it can compete with other WiFi as a WiFi website, and busy channel after image LTE website is the same transmits data expeditiously.
In prior art, third generation partner program 3GPP (the3rdGenerationPartnershipProject) formally proposes LAA technology in the Release-13 stage, and using Listen Before Talk LBT (ListenBeforeTalk) as its key technology.ETSI ETSI (EuropeanTelecommunicationsStandardsInstitute) proposes 4 kinds of LBT type: NOLBT, there is no the LBT of random back, have random back but contention window fix LBT, have random back and the LBT of contention window change.
The application is the improvement carried out for the first type, namely for NOLBT type.Under this type, when LAA base station has data to need to transmit, it is not competed with WiFi and directly occupies channel.LAA base station determines according to channel estimating and user feedback the time period distributing to WiFi transmission, and during this period of time LAA sends ABS blank frame, and now WiFi can detect channel idle, then transmits data.
There are the following problems for prior art: in NOLBT type, and LAA base station is when jointly taking the channel of unauthorized frequency range with WiFi website, and the time of its busy channel is uncertain.When the long-time busy channel in LAA base station, the efficiency comparison of transfer of data is high, but just means that the time of WiFi website busy channel can be shorter like this, is inequitable for WiFi; And when the time of LAA base station busy channel is shorter, WiFi website has the more time to take channel, but the data transmission efficiency of LAA base station is just lower.Therefore, fairness when existing LAA BTS channel multiplexing method cannot take into account LAA base station and WiFi website common busy channel and efficiency.
Summary of the invention
The object of the embodiment of the present invention there are provided a kind of channel multiplexing method and device of unauthorized frequency range, fairness when can take into account LAA base station and WiFi website multipling channel and efficiency.
In order to achieve the above object, the embodiment of the invention discloses a kind of channel multiplexing method of unauthorized frequency range, be applied to authorize and assist access LAA base station, described method comprises:
When there is data to be transmitted, the channel energy detected in frame being detected, obtains current WiFi website holding time ratio α to channel in described detection frame;
According to type of service and default first formula of described α, data to be transmitted, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, and adopt the subframe of this first quantity to carry out transfer of data; Wherein, the transmission cycle comprises one and detects frame and multiple transmission frame, and each frame comprises multiple subframes of equal number;
For other transmission frames in the described transmission cycle except the first transmission frame, according to the confirmation message number obtained after transfer of data in previous transmission frame and default second formula, determine the second quantity of the subframe that in other transmission frames, LAA base station takies, and adopt the subframe of this second quantity to carry out transfer of data, wherein, corresponding acknowledge message is received when the data of each subframe are successfully received.
Preferably, the described type of service according to described α, data to be transmitted and default first formula, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, comprising:
According to S=λ E+ (1-λ) F, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, wherein, described first quantity is the described S value that N is corresponding when getting maximum,
M is the sub-frame number that in the transmission cycle, each frame comprises; N is less than the integer that M is greater than zero, and λ is the constant value corresponding with the type of service of data to be transmitted, and its span is 0 ~ 1.
Preferably, described confirmation message number according to obtaining after transfer of data in previous transmission frame and preset the second formula, determine the second quantity of the subframe that in other transmission frames, LAA base station takies, comprising:
For other transmission frames in the described transmission cycle except the first transmission frame, according to
Determine the second quantity of the subframe that in other transmission frames, LAA base station takies, wherein, N
ifor the number of sub frames that LAA base station in previous transmission frame takies, N
i+1for the number of sub frames that LAA base station in these other transmission frames takies, γ is the confirmation message number and N that obtain after transfer of data in previous transmission frame
iratio.
Preferably, the described transmission cycle comprises 1 and detects frame and 4 transmission frames, and each frame comprises 10 subframes.
Preferably, the described channel energy to detecting in frame detects, and obtains current WiFi website holding time ratio α to channel in described detection frame, comprising:
Obtain the channel energy detecting each subframe in frame;
For each subframe detected in frame, judge whether the channel energy of this subframe is greater than the energy threshold of setting, if so, then determine that this subframe is taken by WiFi website;
According to sub-frame number total in the quantity of the subframe taken by WiFi website and this detection frame, determine current WiFi website holding time ratio α to channel in described detection frame.
Preferably, described method also comprises:
In each transmission frame, WiFi website carries out transmitting vacant data frames in the subframe of transfer of data.
In order to reach foregoing invention object, the embodiment of the invention also discloses a kind of channel occupancy device of unauthorized frequency range, be applied to authorize and assist access LAA base station, described device comprises:
Channel detection module, for when there is data to be transmitted, detecting the channel energy detected in frame, obtaining current WiFi website holding time ratio α to channel in described detection frame;
First transport module, for according to the type of service of described α, data to be transmitted and preset the first formula, obtains the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, and adopts the subframe of this first quantity to carry out transfer of data; Wherein, the transmission cycle comprises one and detects frame and multiple transmission frame, and each frame comprises multiple subframes of equal number;
Second transport module, for for other transmission frames in the described transmission cycle except the first transmission frame, according to the confirmation message number obtained after transfer of data in previous transmission frame and default second formula, determine the second quantity of the subframe that in other transmission frames, LAA base station takies, and adopt the subframe of this second quantity to carry out transfer of data, wherein, corresponding acknowledge message is received when the data of each subframe are successfully received.
Preferably, described first transport module specifically for:
According to S=λ E+ (1-λ) F, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, wherein, described first quantity is the described S value that N is corresponding when getting maximum,
M is the sub-frame number that in the transmission cycle, each frame comprises; N is less than the integer that M is greater than zero, and λ is the constant value corresponding with the type of service of data to be transmitted, and its span is 0 ~ 1.
Preferably, described second transport module specifically for:
For other transmission frames in the described transmission cycle except the first transmission frame, according to
Determine the second quantity of the subframe that in other transmission frames, LAA base station takies, wherein, N
ifor the number of sub frames that LAA base station in previous transmission frame takies, N
i+1for the number of sub frames that LAA base station in these other transmission frames takies, γ is the confirmation message number and N that obtain after transfer of data in previous transmission frame
iratio.
Preferably, described channel detection module comprises:
Obtain submodule, for obtaining the channel energy detecting each subframe in frame;
Judge submodule, for for each subframe detected in frame, judge whether the channel energy of this subframe is greater than the energy threshold of setting, if so, then determine that this subframe is taken by WiFi website;
Determine submodule, for according to sub-frame number total in the quantity of the subframe taken by WiFi website and this detection frame, determine current WiFi website holding time ratio α to channel in described detection frame.
As seen from the above technical solution, the embodiment of the present invention is when there is data to be transmitted, first by obtaining the holding time ratio α of current WiFi website to channel to the detection of channel, then according to the type of service of this α and data to be transmitted, by presetting the first formula, obtain the sub-frame number that in the transmission cycle, in first transmission frame, LAA base station takies; And for the sub-frame number that the LAA base station in other transmission frames in the transmission cycle except the first transmission frame takies, then according to the confirmation message number obtained after transfer of data in previous transmission frame and preset the second formula and determine, therefore, it is possible to fairness when taking into account LAA base station and WiFi website multipling channel and efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.Apparently, the accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of the channel multiplexing method of a kind of unauthorized frequency range that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is WiFi website holding time schematic diagram in channel detection process;
Fig. 3 is a kind of structural representation sending the cycle in the embodiment of the present invention;
Fig. 4 is a kind of schematic flow sheet of step S101 in Fig. 1;
Fig. 5 is the process schematic of LAA base station and two WiFi website multipling channels;
The structural representation of the channel multiplexing device of a kind of unauthorized frequency range that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the channel multiplexing device of the another kind of unauthorized frequency range that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention.Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Embodiments provide a kind of channel multiplexing method and device of unauthorized frequency range, fairness when can take into account LAA base station and WiFi website multipling channel and efficiency.Operator utilizes the unauthorized resource of frequency range can reach the object of network capacity shunting, but to consider other access technologies in current unauthorized frequency range take situation.Other access technologies comprise Wireless Fidelity WiFi, bluetooth Bluetooth and ZigBee protocol ZigBee, but mainly WiFi, therefore the embodiment of the present invention is multiplexing object with WiFi website.
Below by specific embodiment, the present invention is described in detail.
See Fig. 1, this figure is the flow chart of the channel multiplexing method of a kind of unauthorized frequency range that the embodiment of the present invention provides, and it comprises the steps:
Step S101: when there is data to be transmitted, detects the channel energy detected in frame, obtains current WiFi website holding time ratio α to channel in this detection frame.
Particularly, when channel is taken by WiFi website, the energy of channel can increase.If detect that channel energy has exceeded certain energy threshold, then can determine that channel is taken by WiFi website.The channel energy detected in frame is detected, the accumulative Channel holding time of WiFi website can be obtained and always detect duration, and then current WiFi website holding time ratio α to channel in this detection frame can be obtained, as shown in Figure 2.
Specifically numerous embodiments can be had, such as, detection frame can be divided into 100 parts, the channel energy in every portion is detected, obtain the number that channel energy exceedes threshold value, using the ratio of this number and total number as the holding time ratio of WiFi website to channel; Also in detection frame, energy measuring can be carried out by certain rule extraction multiple period.The feature of often kind of mode is different, and front a kind of mode is owing to dividing very thin to the testing process of channel, therefore the holding time ratio of the WiFi website obtained to channel is more accurate; Rear a kind of mode is owing to have employed the way of sampling observation, therefore testing process is faster, and efficiency is higher.
Step S102: according to type of service and default first formula of α, data to be transmitted, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, and adopt the subframe of this first quantity to carry out transfer of data.
Wherein, the transmission cycle comprises one and detects frame and multiple transmission frame, and each frame comprises multiple subframes of equal number, and each subframe is a Frame, as shown in Figure 3.
Particularly, according to α and formula S=λ E+ (1-λ) F, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle.Wherein, the first quantity is the value that when making above-mentioned S get maximum, N is corresponding,
M is the sub-frame number that in the transmission cycle, each frame comprises; N is less than the integer that M is greater than zero, and λ is the constant value corresponding with the type of service of data to be transmitted, and its span is 0 ~ 1.When the type of service (as video class) of data to be transmitted has higher requirements to message transmission rate, λ should get higher value; When the type of service (as FTP class) of data to be transmitted is not too high to data transmission rates demands, λ should get smaller value.N gets 0 value and represents the complete busy channel of WiFi website, and N gets M value and represents the complete busy channel in LAA base station, and this does not either way meet fairness and efficiency, and therefore N does not get 0 or M value.
Above-mentioned
The factor characterizing efficiency,
It is the factor characterizing fairness.The measurement of fair principle have employed the fairness exponential formula of RajJain
wherein x
irepresent variable.In embodiments of the present invention, i=2, x
1for the sub-frame number N that LAA base station in transmission frame takies, x
2for the sub-frame number M-N that WiFi website takies.
Step S103: for other transmission frames in the described transmission cycle except the first transmission frame, according to the confirmation message number obtained after transfer of data in previous transmission frame and default second formula, determine the second quantity of the subframe that in other transmission frames, LAA base station takies, and adopt the subframe of this second quantity to carry out transfer of data, wherein, corresponding acknowledge message is received when the data of each subframe are successfully received.
Particularly, for other transmission frames in this transmission cycle except the first transmission frame, according to
Determine the second quantity of the subframe that in other transmission frames, LAA base station takies, wherein, N
ifor the number of sub frames that LAA base station in previous transmission frame takies, N
i+1for the number of sub frames that LAA base station in these other transmission frames takies, γ is the confirmation message number and N that obtain after transfer of data in previous transmission frame
iratio.
γ characterizes the transmission situation of data in previous transmission frame.If the transfer of data of LAA base station and the transfer of data of WiFi website have collision in previous transmission frame, so may there is the situations such as loss in the Frame of LAA base-station transmission, and then the confirmation message number received can few than when not transmitting collision.Therefore, according to value and the above-mentioned formula of γ, the occupation proportion of LAA base station and WiFi website in transmission frame can be adjusted, make data transmission procedure more fair.
Preferably, a transmission cycle can comprise 1 and detect frame and 4 transmission frames, and each frame can comprise 10 subframes.If calculated according to a subframe and Frame 1ms, a transmission frame or a detection frame can be then 10ms, and one sends the cycle can be 50ms.Certainly, a transmission cycle also can comprise 1 and detect frame and 3 transmission frames, or 1 is detected frame and 5 transmission frames, or 1 is detected frame and 6 transmission frames etc.
If detected channel occupancy situation before each transmission frame in the cycle of transmission, namely detection frame and the transmission frame of equal number is comprised in the transmission cycle, because in testing process, data can not be transmitted in LAA base station, therefore this mode can reduce the occupation proportion of LAA base station to channel, and the testing process continued can waste more electric energy.
As shown in the above, the quantity detecting frame and transmission frame in the transmission cycle is arranged can affect LAA base station and WiFi website to efficiency during channel multiplexing and fairness.Both considering the efficiency of LAA base station to transfer of data, take into account again LAA base station and WiFi website under the consideration of the fairness of channel multiplexing, preferably mode is, can arrange the transmission frame that is detected frame and right quantity in a transmission cycle.
In actual applications, in each transmission frame, WiFi website carries out in the subframe of transfer of data, and vacant data frames can also be transmitted in LAA base station.These vacant data frames can comprise major-minor synchronizing signal, Physical Broadcast Channel, reference signal (demodulation, channel quality information, feedback information) etc.When sending vacant data frames, the channel energy that WiFi website detects is very low, can not affect WiFi website and carry out transfer of data, and LAA also can make full use of channel, improves the utilance of channel.
As seen from the above-described embodiment, the embodiment of the present invention obtains current WiFi website and takies situation by detecting channel energy to channel detecting in frame, and obtain the sub-frame number that in the transmission cycle, in first transmission frame, LAA base station takies accordingly, and the sub-frame number that WiFi website takies; The sub-frame number that in other transmission frames, LAA base station takies is determined according to the data transmission scenarios of LAA base station in previous transmission frame, fairness when can take into account LAA base station and WiFi website multipling channel and efficiency.
In another embodiment of the present invention, step S101 in embodiment of the method shown in Fig. 1, the channel energy detected in frame is detected, obtain current WiFi website holding time ratio α to channel in described detection frame, can carry out according to the flow process shown in Fig. 4, detailed process comprises the steps:
Step S401: obtain the channel energy detecting each subframe in frame.
Step S402: for each subframe detected in frame, judge whether the channel energy of this subframe is greater than the energy threshold of setting, if so, then determine that this subframe is taken by WiFi website.
Step S403: according to sub-frame number total in the quantity of the subframe taken by WiFi website and this detection frame, determine current WiFi website holding time ratio α to channel in this detection frame.
In the present embodiment, to detect in units of the subframe in frame, channel is detected, judge whether the channel energy in each subframe is greater than the energy threshold of setting, determine the sub-frame number taken by WiFi website, thus determine current WiFi website holding time ratio α to channel in this detection frame, such execution mode is higher relative to inspecting to detection frame the α value accuracy obtained by random samples, and decrease operational ton, be one preferably execution mode simultaneously.
Below in conjunction with instantiation, the application is elaborated again.
See Fig. 5, this figure be a LAA base station and neighbouring two WiFi website multipling channels time process schematic.In this example, suppose that a transmission cycle comprises 1 and detects frame and 4 transmission frames, each frame comprises 10 subframes, namely M is 10, in figure, LAA base station represented with DL for the period of transmitting data, WiFi website represented with CP for the period of transmitting data, comprised multiple subframe in DL period and CP period.Illustrate only 4 transmission frames in Fig. 5, do not show detection frame.Detailed process is as follows:
Supposing, there is video class data to be transmitted in LAA base station, and by detecting the channel energy detected in frame, obtaining current WiFi website in this detection frame is 0.6 to the holding time ratio α of channel.
Data to be transmitted business due to LAA base station is video class, therefore λ can be set as 0.7, according to the value 0.6 of α, the value 0.7 of λ and default first formula, obtaining the sub-frame number that in the transmission cycle, in transmission frame 1, LAA base station takies is 5, and the sub-frame number that so in transmission frame 1, WiFi website takies also is 5.
LAA base station sends data in the DL period of transmission frame 1 to user, DL phase channel quality due to transmission frame 1 is good and do not have the interference of WiFi website, user have received all subframes of LAA base station transmission and returns all acknowledge messages, the value of γ is 1,6 subframes will be able to be had in transmission frame 2 to be the DL period according to default second formula, 4 subframes are the CP period.
WiFi1 and WiFi2 is at the CP period competitive channel of transmission frame 1, WiFi1 and WiFi2 alternate transport once after, the WiFi1 transmission time have passed through DL period of transmission frame 2, interfere with each other with LAA base station, there is packet loss phenomenon in LAA base station, return 3 acknowledge messages after LAA base-station transmission 6 subframes, the value of γ is 0.5, therefore the DL period in transmission frame 3 is adjusted to 5 subframes, the CP period is 5 subframes.
WiFi1 and WiFi2 at the CP period competitive channel of transmission frame 2, WiFi2 Successful transmissions data.WiFi1 and WiFi2 all detects channel busy in the time started of the end time of transmission frame 2, transmission frame 3, and both all do not transmit data.Now LAA base station is taking the DL period transmission data of transmission frame 3, and it is interference-free, and successfully send all subframes, the value of γ is 1, therefore can obtain the DL period in transmission frame 4 and should be 6 subframes, and the CP period is 4 subframes.
This transmission end cycle, when the next transmission cycle starts, carries out energy measuring to channel again.
From above-mentioned example, the sub-frame number that in first transmission frame in transmission cycle, LAA base station and WiFi website take sets according to the data to be transmitted type of service of the holding time ratio and LAA base station that detect the WiFi website obtained in frame, other transmission frames are then determined according to the data transmission scenarios of LAA base station in a upper transmission frame, efficiency when having taken into account LAA base station and WiFi website multipling channel and fairness.
See Fig. 6, this figure is the structural representation of the channel occupancy device of a kind of unauthorized frequency range that the embodiment of the present invention provides, and corresponding with embodiment of the method shown in Fig. 1, described device comprises:
Channel detection module 601, for when there is data to be transmitted, detecting the channel energy detected in frame, obtaining current WiFi website holding time ratio α to channel in described detection frame.
First transport module 602, for according to the type of service of described α, data to be transmitted and preset the first formula, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, and adopt the subframe of this first quantity to carry out transfer of data.
Wherein, the transmission cycle comprises one and detects frame and multiple transmission frame, and each frame comprises multiple subframes of equal number.In the present embodiment, a transmission cycle can comprise 1 and detect frame and 4 transmission frames, and each frame can comprise 10 subframes.
Particularly, according to S=λ E+ (1-λ) F, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, wherein, described first quantity is the described S value that N is corresponding when getting maximum,
M is the sub-frame number that in the transmission cycle, each frame comprises; N is less than the integer that M is greater than zero, and λ is the constant value corresponding with the type of service of data to be transmitted, and its span is 0 ~ 1.
Second transport module 603, for for other transmission frames in the described transmission cycle except the first transmission frame, according to the confirmation message number obtained after transfer of data in previous transmission frame and default second formula, determine the second quantity of the subframe that in other transmission frames, LAA base station takies, and adopt the subframe of this second quantity to carry out transfer of data, wherein, corresponding acknowledge message is received when the data of each subframe are successfully received.
Particularly, for other transmission frames in the described transmission cycle except the first transmission frame, according to
Determine the second quantity of the subframe that in other transmission frames, LAA base station takies, wherein, N
ifor the number of sub frames that LAA base station in previous transmission frame takies, N
i+1for the number of sub frames that LAA base station in these other transmission frames takies, γ is the confirmation message number and N that obtain after transfer of data in previous transmission frame
iratio.
In actual applications, in each transmission frame, WiFi website carries out in the subframe of transfer of data, and vacant data frames can also be transmitted in LAA base station.
See Fig. 7, this figure is another apparatus structure schematic diagram corresponding with Fig. 6 illustrated embodiment, in this device, the first transport module 702, second transport module 703 is identical with the first transport module 602, second transport module 603 in Fig. 6 respectively, does not repeat them here.Channel detection module 701 specifically comprises:
Obtain submodule 7011, for obtaining the channel energy detecting each subframe in frame;
Judge submodule 7012, for for each subframe detected in frame, judge whether the channel energy of this subframe is greater than the energy threshold of setting, if so, then determine that this subframe is taken by WiFi website;
Determine submodule 7013, for according to sub-frame number total in the quantity of the subframe taken by WiFi website and this detection frame, determine current WiFi website holding time ratio α to channel in described detection frame.
Because said apparatus embodiment obtains based on the embodiment of the method for the channel occupancy of unauthorized frequency range, have identical technique effect with the method, therefore the technique effect of device embodiment does not repeat them here.
For device embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
One of ordinary skill in the art will appreciate that, all or part of step in above-mentioned execution mode is that the hardware can be correlated with by program command has been come, and described program can be stored in computer read/write memory medium.Here alleged storage medium, refers to ROM/RAM, magnetic disc, CD etc.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a channel multiplexing method for unauthorized frequency range, is characterized in that, is applied to authorize to assist access LAA base station, and described method comprises:
When there is data to be transmitted, the channel energy detected in frame being detected, obtains current WiFi website holding time ratio α to channel in described detection frame;
According to type of service and default first formula of described α, data to be transmitted, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, and adopt the subframe of this first quantity to carry out transfer of data; Wherein, the transmission cycle comprises one and detects frame and multiple transmission frame, and each frame comprises multiple subframes of equal number;
For other transmission frames in the described transmission cycle except the first transmission frame, according to the confirmation message number obtained after transfer of data in previous transmission frame and default second formula, determine the second quantity of the subframe that in other transmission frames, LAA base station takies, and adopt the subframe of this second quantity to carry out transfer of data, wherein, corresponding acknowledge message is received when the data of each subframe are successfully received.
2. method according to claim 1, is characterized in that, the described type of service according to described α, data to be transmitted and default first formula, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, comprising:
According to S=λ E+ (1-λ) F, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, wherein, described first quantity is the described S value that N is corresponding when getting maximum,
M is the sub-frame number that in the transmission cycle, each frame comprises; N is less than the integer that M is greater than zero, and λ is the constant value corresponding with the type of service of data to be transmitted, and its span is 0 ~ 1.
3. method according to claim 1, is characterized in that, described confirmation message number according to obtaining after transfer of data in previous transmission frame and preset the second formula, determines the second quantity of the subframe that in other transmission frames, LAA base station takies, comprising:
For other transmission frames in the described transmission cycle except the first transmission frame, according to
Determine the second quantity of the subframe that in other transmission frames, LAA base station takies, wherein, N
ifor the number of sub frames that LAA base station in previous transmission frame takies, N
i+1for the number of sub frames that LAA base station in these other transmission frames takies, γ is the confirmation message number and N that obtain after transfer of data in previous transmission frame
iratio.
4. method according to claim 1, is characterized in that, the described transmission cycle comprises 1 and detects frame and 4 transmission frames, and each frame comprises 10 subframes.
5. method according to claim 1, is characterized in that, the described channel energy to detecting in frame detects, and obtains current WiFi website holding time ratio α to channel in described detection frame, comprising:
Obtain the channel energy detecting each subframe in frame;
For each subframe detected in frame, judge whether the channel energy of this subframe is greater than the energy threshold of setting, if so, then determine that this subframe is taken by WiFi website;
According to sub-frame number total in the quantity of the subframe taken by WiFi website and this detection frame, determine current WiFi website holding time ratio α to channel in described detection frame.
6. method according to claim 1, is characterized in that, also comprises:
In each transmission frame, WiFi website carries out transmitting vacant data frames in the subframe of transfer of data.
7. a channel occupancy device for unauthorized frequency range, is characterized in that, is applied to authorize to assist access LAA base station, and described device comprises:
Channel detection module, for when there is data to be transmitted, detecting the channel energy detected in frame, obtaining current WiFi website holding time ratio α to channel in described detection frame;
First transport module, for according to the type of service of described α, data to be transmitted and preset the first formula, obtains the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, and adopts the subframe of this first quantity to carry out transfer of data; Wherein, the transmission cycle comprises one and detects frame and multiple transmission frame, and each frame comprises multiple subframes of equal number;
Second transport module, for for other transmission frames in the described transmission cycle except the first transmission frame, according to the confirmation message number obtained after transfer of data in previous transmission frame and default second formula, determine the second quantity of the subframe that in other transmission frames, LAA base station takies, and adopt the subframe of this second quantity to carry out transfer of data, wherein, corresponding acknowledge message is received when the data of each subframe are successfully received.
8. device according to claim 7, is characterized in that, described first transport module specifically for:
According to S=λ E+ (1-λ) F, obtain the first quantity of the subframe that LAA base station takies in first transmission frame in the transmission cycle, wherein, described first quantity is the described S value that N is corresponding when getting maximum,
M is the sub-frame number that in the transmission cycle, each frame comprises; N is less than the integer that M is greater than zero, and λ is the constant value corresponding with the type of service of data to be transmitted, and its span is 0 ~ 1.
9. device according to claim 7, is characterized in that, described second transport module specifically for:
For other transmission frames in the described transmission cycle except the first transmission frame, according to
Determine the second quantity of the subframe that in other transmission frames, LAA base station takies, wherein, N
ifor the number of sub frames that LAA base station in previous transmission frame takies, N
i+1for the number of sub frames that LAA base station in these other transmission frames takies, γ is the confirmation message number and N that obtain after transfer of data in previous transmission frame
iratio.
10. device according to claim 7, is characterized in that, described channel detection module comprises:
Obtain submodule, for obtaining the channel energy detecting each subframe in frame;
Judge submodule, for for each subframe detected in frame, judge whether the channel energy of this subframe is greater than the energy threshold of setting, if so, then determine that this subframe is taken by WiFi website;
Determine submodule, for according to sub-frame number total in the quantity of the subframe taken by WiFi website and this detection frame, determine current WiFi website holding time ratio α to channel in described detection frame.
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