CN104066198B - The method and system of channel are selected in Wireless LAN - Google Patents
The method and system of channel are selected in Wireless LAN Download PDFInfo
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- CN104066198B CN104066198B CN201310097528.0A CN201310097528A CN104066198B CN 104066198 B CN104066198 B CN 104066198B CN 201310097528 A CN201310097528 A CN 201310097528A CN 104066198 B CN104066198 B CN 104066198B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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Abstract
The invention discloses the methods of selection channel in a kind of Wireless LAN (WLAN), this method comprises: when needing to carry out data transmission, transmitting station and receiving station are used to indicate the parameter vector set of channel busy-idle condition according to more than one of self maintained, negotiate the channel that can be used.The present invention discloses select the system of channel that can effectively utilize channel resource using method and system of the invention in a kind of WLAN.
Description
Technical field
The present invention relates to Wireless LAN (WLAN, Wireless Local Area Networks) technologies, especially relate to
And the method and system of channel are selected in a kind of WLAN.
Background technique
Currently, WLAN technology is fast-developing in field of wireless.Since the demand to WLAN transmission rate increasingly increases
Long, Institute of Electrical and Electric Engineers industrial specification IEEE802.11 group has set up special duty group to meet this demand,
To realize high data rate.The frequency spectrum of WLAN gradually expands to 5.8GHz frequency range, 1GHz other than traditional 2.4GHz
Following frequency range, or even extended also to the millimeter wave frequency band of 60GHz and 45GHz.
In wlan system, a center control point and multiple websites associated with the center control point (STA,
STAtion a basic service set (BSS, Basic Service Set)) is constituted.Here, the center control point, which refers to, connects
Access point (AP, Access Point) or personal basic service set control point (PCP, Personal basic service set
Control Point).
In wlan system, multiple wireless STA use Carrier Sense Multiple/conflict avoidance (CSMA/CA, Carrier Sense
Multiple Access with Collision Avoidance) the shared channel of mechanism.Channel is shared using CSMA/CA mechanism
One of greatest problem be exactly the problem of hiding STA, specifically, as shown in Figure 1, STA A sends data, while STA to STA B
C also sends data to STA B, since STA C and STA A are in each other except the coverage area of other side, in this way, STA A and
STA C will lead to a conflict when sending data to STA B simultaneously.It is in due to STA C except the coverage area of STA A,
From the perspective of STA A, STA C is the hiding STA of STA A.In order to solve the problems, such as to hide STA, IEEE802.11 is mentioned
Gone out pseudo channel testing mechanism, it may be assumed that in radio frames frame head include reserve channel time (Duration), other receive containing
The STA that audits of the radio frames of Duration will be updated locally stored network allocation vector (NAV, Network
Allocation Vector), wherein the form of expression of NAV is mainly NAV timer, updates NAV and just refers to update NAV timing
The numerical value of device, specifically, the value of NAV timer are updated to the maximum value of the Duration in all radio frames received, at this
In period, data will not be sent by auditing STA, the problem of so as to avoid hiding STA competitive channel.The value of NAV timer subtracts
After being zero, other STA could send data.For example for, Fig. 2 is to send (RTS, Request To using request
Send) frame/clear to send (CTS, Clear To Send) frame carries out the schematic diagram of channel booking, as shown in Fig. 2, sending STA hair
It send the RTS frame for carrying Duration to carry out channel booking, after reception STA receives the RTS frame, is carried to STA response is sent
The CTS frame of Duration carries out channel booking confirmation, to guarantee that sender can complete Frame switch.Meanwhile it auditing STA and receiving institute
After stating RTS frame and the CTS frame, access is postponed, the time for postponing access is the maximum of RTS frame and the Duration in CTS frame
Value.In addition, if local NAV timer is by other STA in addition to sending STA when reception STA receives the RTS frame
It is updated to non-zero value, then CTS frame cannot be sent to respond RTS frame by receiving STA.
In the millimere-wave band application of WLAN, signal is sent using directional antenna beam rather than omni-beam is used to send letter
Number, this sending method is conducive to spatial reuse, and can will measure and focus on a direction, so as to improve transmission STA and connects
Receive the communication quality of STA.But after sending signal using directional antenna beam, since not all STA can be in this narrow wave
In the coverage area of beam, so this sending method makes CSMA/CA mechanism no longer reliable.Here, the directional antenna beam is
Finger signal cover is taper, and the omni-beam refers to signal cover for spherical shape.In order to adapt to the feelings of wave beam transmission
Condition dispatches each STA using center control point in the WLAN for sending signal using directional antenna beam and sends signal, to realize
It avoids interfering while spatial reuse.Wherein, the range of center control point scheduling includes: to believe between center control point and each STA
Number transmission and STA and STA between signal transmission.In traditional WLAN, NAV timer only one, i.e. STA according to
The maximum value in the Duration in each radio frames received updates the value of local NAV timer, and is using directionality wave
Beam is sent in the WLAN of signal, and STA can have multiple NAV timers, and each NAV timer is identified by the address of a pair of of STA,
For example it for, after radio frames of the STA A transmission containing Duration give STA B, STA B to receive radio frames, is rung to STA A
It should judge that channel is accounted for by STA A and STA B containing the radio frames of Duration, after STA C has received the two radio frames
With, then the maximum value for the Duration in radio frames that STA C is sent according to STA A and STA B updates a NAV timer,
And bind the address of the NAV timer and STA A and STA B, it can be denoted as NAV-SA and NAV-DA respectively.
The more gigabits of directionality in the prior art (DMG, Directional Multi-Gigabit) net is exemplified below
The process of transmission protection and setting NAV timer in network.Assuming that STA1 and STA2 need to occupy a transmission opportunity
(TXOP) or the period of service (SP) carries out data transmission and needs protecting the data of transmission, and STA1 is to send STA,
The time that the data of transmission need to occupy can be obtained by competition, can also be held by center control point or current channel
Person's distribution or authorization.Here, STA can be AP or PCP.STA1 and STA2 is monitored in a period of time T before TXOP or SP
Channel, here, the value of T can be different according to the difference of access way, and the busy of channel is arranged according to snoop results,
If after having received the radio frames containing Duration of other STA, needing to carry out the update of the value of NAV timer.If
STA1 listens to channel idle in T, then RTS frame can be sent when TXOP or SP start to STA2；If TXOP or SP are opened
When the beginning, Channel Detection is that the value of busy or the local STA1 any NAV timer is not 0, then STA1 cannot be counted in channel busy or NAV
When device value be not 0 period to carry out radio frame transmission, i.e., cannot send RTS frame to STA2, only equal channels are not in a hurry or NAV
The value of timer can just attempt access channel when being 0.After STA2 receives the RTS frame of STA1, if STA2 is listened in T
The value of the NAV timer of channel idle and local is 0, then STA2 sends DMG CTS frame to STA1 to respond the RTS immediately
Frame；If the value of the NAV timer of the local STA2 is not that 0, STA2 cannot reply DMG CTS frame, but can reply DMG and refuse
(DTS, Denial To Send) frame is sent absolutely, and by the maximum residual value in the remaining value of itself all NAV timer and is somebody's turn to do
The corresponding communicating transmitting-receiving side address, that is, NAV-SA and NAV-DA of NAV timer, is informed by DMG DTS frame to STA1.
For example for, the SP that a time span is T1 is assigned in STA1 and STA2, when STA1 receive be STA2 DMG
DTS frame, and inform cannot send data within the T2 time after DMG DTS frame after, STA1 using T2 update local NAV timer
Value, in this case, STA1 can only use the time remaining after T2 in T1 to carry out data transmission.
From the above description, it will be seen that STA is when carrying out radio frame transmission, local NAV only considers time factor, i.e.,
As long as the value of NAV timer is not that 0, STA cannot carry out data transmission, but WLAN millimeter wave in use, in the presence of
A variety of bandwidth corresponding with channel are available, if only considering the value of NAV timer along in aforementioned manners, may making
At the waste of resource.For example for, in above process, it is assumed that be STA1 and the bandwidth of STA2 distribution is a certain center frequency
The 2GHz of rate, two channels of bandwidth occupancy of distribution, and the bandwidth that the transmission that NAV is arranged only uses the low 1GHz in 2GHz is corresponding
Channel, that is to say, that in the T2 time actually only have 1GHz bandwidth it is occupied, but STA1 and STA2 according to the prior art not
It is able to carry out channel selection, i.e., cannot occupy the corresponding channel of bandwidth of the low 1GHz in the remaining i.e. 2GHz of 1GHz bandwidth in T2
It is inside transmitted, in this way, will cause channel resource waste.
Summary of the invention
In view of this, can have the main purpose of the present invention is to provide the method and system for selecting channel in a kind of WLAN
Effect ground utilizes channel resource.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The present invention provides a kind of methods that channel is selected in WLAN, this method comprises:
When needing to carry out data transmission, STA and reception STA are sent according to more than one of self maintained and is used to indicate channel
The parameter vector set of busy-idle condition, negotiates the channel that can be used.
In above scheme, the transmission STA and reception STA is used to indicate channel busy according to more than one of self maintained
The parameter vector set of state, negotiates the channel that can be used, comprising:
The STA that sends is according to one above parameter vector collection for being used to indicate channel busy-idle condition of self maintained
It closes, the channel that itself can be used is determined from the channel of distribution；
It is described send STA self maintained it is one more than be used to indicate the parameter vector set of channel busy-idle condition
Before the subscription time phase for including expires, sent to the reception STA comprising available using the determining channel that itself can be used
The radio frames of interphase information when channel and correspondence；
The STA that receives is according to one above parameter vector collection for being used to indicate channel busy-idle condition of self maintained
The radio frames closed and received, the nothing of interphase information when including the channel of this data transmissions and correspond to the transmission STA
Line frame.
It is described to send the radio frames that STA is sent as RTS frame in above scheme；Correspondingly, the nothing for receiving STA and sending
Line frame is CTS frame or DTS frame.
In above scheme, the RTS frame, the CTS frame and channel information and/or corresponding time in the DTS frame
Signaling domain or clothes of the explicit carrying of phase information in the physical layer frame head of the RTS frame, the CTS frame and the DTS frame
It is engaged in domain；Alternatively,
The RTS frame, the CTS frame and channel information in the DTS frame and/or it is corresponding when interphase information it is explicit
Carrying the RTS frame, the CTS frame and the DTS frame media access control (MAC, Media Access
Control) in layer frame head.
In above scheme, when the radio frames that the transmission STA is sent are RTS frame, the radio frames for receiving STA transmission are
When CTS frame, the channel used in transmission radio frames of channel information implicitly in radio frames is determined.
In above scheme, before the method step, this method further include:
The transmission STA and the reception STA monitor the channel of distribution within the set time, and are safeguarded according to snoop results
The one above parameter vector set for being used to indicate channel busy-idle condition of itself.
In above scheme, the parameter vector set includes: subscription time phase, associated channel and described associated
The address channel corresponding transmitting-receiving side STA.
In above scheme, this method further include:
The STA that sends is carried out data transmission using the channel that can be used negotiated with the reception STA.
In above scheme, the STA that sends is using the channel that can be used negotiated and reception STA progress data biography
It is defeated, comprising:
It is described to send the channel and correspond to the time that STA is indicated using the CTS frame when the radio frames received are CTS frame
Phase carries out data transmission with the reception STA；Alternatively,
When the radio frames received are DTS frame, the non-serviceable channel in the channel of the distribution of DTS frame instruction
When interphase expire before, the STA that sends is using cannot except in the channel of the distribution of DTS frame instruction in itself available channel
Other channels outside the channel used carry out data transmission with the reception STA；
After the when interphase of non-serviceable channel expires in the channel of the distribution of DTS frame instruction, the transmission STA
Using the channel for the non-serviceable channel for including DTS frame instruction, carry out data transmission with the reception STA；
Wherein, the DTS frame include in the channel of distribution non-serviceable channel and it is corresponding when interphase information.
In above scheme, this method further include:
After the when interphase of non-serviceable channel expires in the channel of the distribution of DTS frame instruction, the transmissions STA and
The STA that receives is according to one above parameter vector set for being used to indicate channel busy-idle condition of self maintained, again
Negotiate the channel that can be used.
The present invention also provides the systems that channel is selected in a kind of WLAN, which includes: the first STA and the 2nd STA；Its
In,
First STA when for needing to carry out data transmission, is used to refer to the 2nd STA according to more than one of self maintained
The parameter vector set for showing channel busy-idle condition, negotiates the channel that can be used.
In above scheme, the first STA is specifically used for: one according to self maintained is used to indicate letter above
The parameter vector set of road busy-idle condition determines the channel that itself can be used from the channel of distribution；Described in self maintained
Before the subscription time phase that more than one parameter vector set for being used to indicate channel busy-idle condition includes expires, using it is determining from
The radio frames of interphase information when the channel that body can use sends comprising available channel and corresponds to the 2nd STA；And receive institute
The radio frames of interphase information when stating the channel comprising this data transmissions of the 2nd STA transmission and corresponding to；
2nd STA, the nothing of interphase information when including available channel and is corresponding sent for receiving the first STA
After line frame, according to one above nothing for being used to indicate the parameter vector set of channel busy-idle condition and receiving of self maintained
Line frame, the radio frames of interphase information when the first STA of Xiang Suoshu includes the channel of this data transmissions and corresponds to.
In above scheme, the radio frames that the first STA is sent are RTS frame；Correspondingly, the nothing that the 2nd STA is sent
Line frame is CTS frame or DTS frame.
In above scheme, the first STA is also used to monitor the channel of distribution within the set time, and ties according to monitoring
Fruit safeguards the one above parameter vector set for being used to indicate channel busy-idle condition of itself；
2nd STA for monitoring the channel of distribution within the set time, and safeguards according to snoop results itself institute
State more than one parameter vector set for being used to indicate channel busy-idle condition.
In above scheme, the parameter vector set includes: subscription time phase, associated channel and described associated
The address channel corresponding transmitting-receiving side STA.
In above scheme, the first STA, be also used to using the channel that can be used that negotiates and the 2nd STA into
The transmission of row data.
In above scheme, when carrying out data transmission, the first STA is specifically used for: when the radio frames received are CTS
When frame, the channel that is indicated using the CTS frame and it is corresponding when interphase, carry out data transmission with the 2nd STA；Alternatively, when receiving
When the radio frames arrived are DTS frame, the when interphase of non-serviceable channel expires it in the channel of the distribution of DTS frame instruction
Before, using in itself available channel except other channels in the channel of the distribution of DTS frame instruction in addition to non-serviceable channel,
Carry out data transmission with the 2nd STA；And in the channel of the distribution indicated in the DTS frame non-serviceable channel when
After interphase expires, using the channel for the non-serviceable channel for including DTS frame instruction, data are carried out with the 2nd STA
Transmission；Wherein, the DTS frame include in the channel of distribution non-serviceable channel and it is corresponding when interphase information.
The method and system that channel is selected in WLAN provided by the invention when needing to carry out data transmission, send STA and connect
It receives STA the parameter vector set of channel busy-idle condition is used to indicate according to more than one of self maintained, negotiating can use
Channel, in this way, channel resource can be effectively utilized.
Carried out data transmission using the channel that can be used negotiated with STA is received in addition, sending STA, in this way, communication
It can make full use of channel resource between STA and avoid interfering, to improve the handling capacity of system.
Detailed description of the invention
Fig. 1 is to hide STA schematic diagram；
Fig. 2 is the schematic diagram that channel booking is carried out using RTS frame/CTS frame；
Fig. 3 is the method flow schematic diagram that channel is selected in WLAN of the present invention；
Fig. 4 is the channel schematic diagram that various countries' communication uses in the embodiment of the present invention one；
Fig. 5 is the specific channel schematic diagram distributed in the embodiment of the present invention one；
Fig. 6 is the schematic diagram that STA1 and STA2 carry out data transmission in the embodiment of the present invention one；
Fig. 7 is the system structure diagram that channel is selected in WLAN of the present invention.
Specific embodiment
The basic idea of the invention is that: when needing to carry out data transmission, sends STA and receive STA according to self maintained
More than one is used to indicate the parameter vector set of channel busy-idle condition, negotiates the channel that can be used.
With reference to the accompanying drawing and specific embodiment the present invention is further described in more detail.
The method that channel is selected in WLAN of the present invention, as shown in Figure 3, comprising the following steps:
Step 301: when needing to carry out data transmission, sending STA and reception STA and be used for according to more than one of self maintained
The parameter vector set for indicating channel busy-idle condition, negotiates the channel that can be used；
Here, the transmission STA refers to the STA for sending data；The reception STA refers to the STA for receiving data；
Here, the specific implementation of this step includes:
The STA that sends is according to one above parameter vector collection for being used to indicate channel busy-idle condition of self maintained
It closes, the channel that itself can be used is determined from the channel of distribution；
It is described send STA self maintained it is one more than be used to indicate the parameter vector set of channel busy-idle condition
Before the subscription time phase for including expires, sent to the reception STA comprising available using the determining channel that itself can be used
The radio frames of interphase information when channel and correspondence；
The STA that receives is according to one above parameter vector collection for being used to indicate channel busy-idle condition of self maintained
The radio frames closed and received, the nothing of interphase information when including the channel of this data transmissions and correspond to the transmission STA
Line frame.
Wherein, the radio frames for sending STA transmission can be RTS frame, correspondingly, described receive the wireless of STA transmission
Frame is CTS frame or DTS frame.Here, when the reception STA radio frames sent are DTS frame, the DTS frame includes distribution
In channel non-serviceable channel and it is corresponding when interphase information；In other words, the transmission STA can include point according to DTS frame
In the channel matched non-serviceable channel and it is corresponding when interphase information immediately arrive at the channel and correspondence of this data transmissions
When interphase.
The parameter vector set includes: subscription time phase, associated channel and the corresponding receipts of the associated channel
The address originating party STA；Here, if the parameter vector collection is combined into NAV, the subscription time phase uses the value of NAV timer
To embody.The associated channel refers to: before the subscription time phase expires, virtual carrier testing result is the channel of channel busy.
In the channel for the distribution that the DTS frame includes non-serviceable channel and it is corresponding when interphase information be derived from the receptions STA and safeguard
One above parameter vector set for being used to indicate channel busy-idle condition cannot specifically be used in the channel of distribution
Channel information be derived from associated channel, interphase information is derived from the remaining value of the subscription time phase when corresponding.
Here, the RTS frame, the CTS frame and channel information in DTS frame and/or it is corresponding when interphase information can be with
Signaling domain or service of the explicit carrying in the physical layer frame head of the RTS frame, the BMG CTS frame and the DTS frame
In domain；Alternatively, carrying that can be explicit is in the MAC layer frame head of the RTS frame, the CTS frame and the DTS frame.
When the radio frames that the transmission STA is sent are RTS frame, the radio frames for receiving STA transmission are CTS frame, nothing
Channel information in line frame can be implicit the channel used in transmission radio frames determine.
Before step 301, this method be can further include:
The transmission STA and the reception STA monitor the channel of distribution within the set time, and are safeguarded according to snoop results
The one above parameter vector set for being used to indicate channel busy-idle condition of itself.
Step 302: the STA that sends is carried out data transmission using the channel that can be used negotiated with the reception STA.
Specifically, when the radio frames received are CTS frame, the channel and right for sending STA and being indicated using the CTS frame
Seasonable interphase carries out data transmission with the reception STA.
The DTS frame include in the channel of distribution non-serviceable channel and it is corresponding when interphase information；It is wireless when what is received
It is described before the when interphase of non-serviceable channel expires in the channel of the distribution of the DTS frame instruction when frame is DTS frame
Transmission STA uses other in addition to non-serviceable channel in the channel of the distribution of DTS frame instruction in itself available channel
Channel carries out data transmission with the reception STA；
After the when interphase of non-serviceable channel expires in the channel of the distribution of DTS frame instruction, the transmission STA
Using the channel for the non-serviceable channel for including DTS frame instruction, carry out data transmission with the reception STA.
This method can further include:
After the when interphase of non-serviceable channel expires in the channel of the distribution of DTS frame instruction, the transmission STA
With the reception STA according to one above parameter vector set for being used to indicate channel busy-idle condition of self maintained, weight
Newly negotiate the channel that can be used.
The present invention is described in further detail again below with reference to embodiment.
Embodiment one
The application scenarios of the present embodiment are as follows: in a BSS of DMG network, PCP or AP are that STA1 and STA2 distributes one
SP to carry out data transmission, and at the beginning of indicating SP, time span and used channel.Wherein, STA1 is hair
Sending STA, STA2 is to receive STA；STA3 and STA4 is the STA of other BSS.Here, it is assumed that the SP of distribution is made
Channel are as follows: the 2.16GHz of centre frequency 60.5, i.e. channel 2, time span 10ms, STA1 and STA2 are before SP starts
Minimum listening period (DMGPP Min Listening Time) in carried out on bandwidth, that is, channel 2 of the 2.16GHz of distribution
Detection.Wherein, as shown in figure 4, China is communicated using channel 2 and channel 3, and as shown in figure 5, channel 2 is divided into
Channel 5 and channel 6, channel 3 are divided into channel 7 and channel 8 again.
When any frame is not detected in STA1 and STA2, then when SP starts, band of the STA1 in the 2.16GHz of channel 2
The RTS frame of interphase information is to STA2 when sent on width comprising available channel and being corresponded to, wherein available channel 2.16GHz believes
Road 2, interphase is 10ms when corresponding；After STA2 receives the RTS frame, gets STA1 and send the time span of data and to use
Channel, update the NAV of itself since any frame is not detected in STA2, STA2 is in the 2.16GHz bandwidth of channel 2
Reply the channel comprising this data transmissions and it is corresponding when interphase information DMG CTS frame, wherein available channel is
2.16GHz, i.e. channel 2, interphase is 10ms when corresponding, that is to say, that finish time of the temporal information of STA2 instruction and available
Channel is identical as the finish time of the STA1 temporal information indicated and available channel, therefore, after STA1 receives DMG CTS frame,
STA1 and STA2 can occupy the entire SP time in the 2.16GHz bandwidth of channel 2 to carry out data transmission.
When any frame is not detected in STA1, and STA2 is detected on low 1.08GHz bandwidth, that is, channel 5 in 2.16GHz
When the radio frames comprising Duration for having STA3 to be sent to STA4, what STA2 detected that STA3 is sent to STA4 includes
After the radio frames of Duration, local NAV is updated according to the radio frames and is specifically denoted as the associated channel of the NAV
Low 1.08GHz that STA3 is occupied, i.e. channel 5, the address associated channel corresponding transmitting-receiving side STA are denoted as (address STA3, STA4
Location), the value for updating NAV timer is the value of Duration, here, suppose that STA3 is sent to Duration in the radio frames of STA4
For 5ms, then the value for updating NAV timer is 5ms, and starts timing.Since any frame is not detected, when SP starts,
STA1 sent in the bandwidth of the 2.16GHz of channel 2 comprising available channel and it is corresponding when interphase information RTS frame to STA2,
In, available channel 2.16GHz, i.e. channel 2, interphase is 10ms when corresponding；After STA2 receives the RTS frame, check local
The value of NAV state, the NAV timer that the frame that discovery STA3 is sent updates there remains 3ms, then STA2 is in low 1.08GHz, that is, channel 6
The DMG CTS frame of interphase information when upper transmission is wrapped the channel of this data transmissions and corresponded to, wherein this data transmissions
Channel and it is corresponding when interphase information instruction 2.16GHz in high 1.08GHz, that is, channel 6 (10ms- sends accounting for for RTS frame
Used time m- interframe space-transmission DMG CTS frame holding time) in can use, as shown in fig. 6, STA1 receives the DMG CTS
After frame, in STA1 and STA2 channel and time that in the channel and correspondence of this data transmissions, interphase information is indicated
Carry out data transmission；Alternatively, after STA2 receives the RTS frame, to STA1 send in the channel of distribution non-serviceable channel and
The DMG DTS frame of interphase information when corresponding, wherein in the channel of distribution non-serviceable channel and it is corresponding when interphase information indicate
Low 1.08GHz, that is, channel 5 in 2.16GHz is at next (3ms- interframe space-transmission DMG DTS frame holding time)
Interior unavailable, after STA1 receives the DMG DTS frame, STA1 and STA2 are in the channel of the distribution in the DMG DTS frame
Non-serviceable channel and it is corresponding when the instruction of interphase information when interphase in without using low 1.08GHz, that is, channel 5 carry out data biography
It is defeated, and carried out data transmission using high 1.08GHz, that is, channel 6.It cannot be used in the channel of the distribution in the DMG DTS frame
Channel and it is corresponding when the instruction of interphase information when interphase expire after, STA1 and STA2 can be used entire channel 2 and carry out data
Transmission, it may be assumed that channel 5 can be used and channel 6 carries out data transmission.Meanwhile in the channel of the distribution in the DMG DTS frame
After the when interphase of interphase information instruction expires when non-serviceable channel and correspondence, STA1 and STA2 can be by existing again
Monitor channel 2 in DMGPP Min Listening Time, with safeguard the NAV of itself and re-start transmission data needed for letter
The negotiation in road and time；Wherein, the time of negotiation cannot cannot exceed 10ms beyond the SP of distribution, and bandwidth maximum can arrive
The 2.16GHz of the channel 2 of distribution.Wherein, in Fig. 6,Indicate that STA1 is sent to the radio frames of STA2,It indicates
STA2 is sent to the radio frames of STA1,Indicate the radio frames from other STA.
There is STA3 to be sent to when STA1, STA2 are detected on the low 1.08GHz bandwidth i.e. channel 5 in 2.16GHz
When the radio frames comprising Duration of STA4, then STA1 and STA2 detect STA3 be sent to STA4 comprising Duration
After radio frames, local NAV is updated all in accordance with the radio frames, specifically, the associated bandwidth of the NAV is denoted as STA3 occupancy
Low 1.08GHz, i.e. channel 5, the association address STA are denoted as (address STA3, the address STA4), and the value for updating NAV timer is
The value of Duration then updates NAV timer here, suppose that it is 5ms that STA3, which is sent to Duration in the radio frames of STA4,
Value is 5ms, and starts timing.Due to detecting radio frames on channel 5, when SP starts, STA1 is sent on channel 6
The RTS frame of interphase information is to STA2 comprising available channel and when correspondence, wherein available channel is low 1.08GHz, that is, channel 6, right
Seasonable interphase is 10ms；After STA2 receives the RTS frame, the channel of this data transmissions is replied to STA1 on channel 6
And when corresponding interphase information DMG CTS frame, wherein the channel of this data transmissions and it is corresponding when interphase information indicate
High 1.08GHz, that is, channel 6 in 2.16GHz is in (holding time-interframe space-transmission DMG CTS frame of 10ms- transmission RTS frame
Holding time) in can use, after STA1 receives the DMG CTS frame, this number of STA1 and STA2 in the DMG CTS frame
Carry out data transmission according to the channel of interphase information instruction when transmitting usable channel and corresponding to and in the time, i.e., it is enterprising in channel 6
The transmission of row data；Alternatively, STA1 and STA2 exist before the value of the NAV timer for the channel 5 that the frame that STA3 is sent updates is 0
Carry out data transmission on channel 6, and after being 0 in the value of the NAV timer for the channel 5 that the frame that STA3 is sent updates, using entire
Channel 2 carries out data transmission.
Here, it should be understood that being described in the present embodiment using NAV, in practical application, used parameter
Vector set can be other titles, in other words, newly define other local parameters in practical application, also can according to need
Vector set is without the use of NAV.
Embodiment two
In the present embodiment, mainly illustrate the transmission of the RTS frame, DMG CTS frame and DMG DTS frame in embodiment one
Method.
When RTS frame and DMG CTS frame are sent as first initiation frame, the total bandwidth of transmission are as follows: carrier wave is detected as not busy
The form for repeating to send in multiple primary bandwidth units can be used in the subset of bandwidth.
When frame is sent in response for DMG CTS frame and DMG DTS frame, the total bandwidth of transmission are as follows: carrier wave is detected as not busy
The subset of bandwidth, and to initiate frame, that is, RTS frame bandwidth subset, it can be used and repeat transmission in multiple primary bandwidth units
Form.
When the transmission bandwidth of DMG DTS frame may include that carrier wave is detected as busy bandwidth, can be used multiple basic
The form sent is repeated in bandwidth unit.
Wherein, the primary bandwidth unit refers to the minimum bandwidth of support, for example for, it is assumed that a wlan system
Support the bandwidth of 4MHz, 2MHz, 1MHz, then 1MHz is then a primary bandwidth unit.
Embodiment three
In the present embodiment, mainly illustrate that available bandwidth and the parameter of corresponding time span are used to indicate in embodiment one to exist
RTS frame, DMG CTS frame and position and sending method in DMG DTS frame.
The parameter for being used to indicate available bandwidth and/or corresponding time span can be explicit carrying in RTS frame, DMG CTS
In signaling domain or service-domain in the physical layer frame head of frame and DMG DTS frame；Alternatively,
The parameter for being used to indicate available bandwidth and/or corresponding time span can be explicit carrying in RTS frame, DMG CTS
In media access control (MAC, Media Access Control) layer frame head of frame and DMG DTS frame；
The parameter for being used to indicate available bandwidth implicit can be determined by the transmission bandwidth of radio frames.
To realize the above method, the present invention also provides the systems that channel is selected in a kind of WLAN, as shown in fig. 7, this is
System includes: the first STA71 and the 2nd STA72；Wherein,
First STA71, when for needing to carry out data transmission, with the 2nd STA72 according to more than one use of self maintained
In the parameter vector set of instruction channel busy-idle condition, the channel that can be used is negotiated.
Here, the first STA is to send STA, and the 2nd STA is to receive STA；Wherein, the transmission STA refers to hair
Send the STA of data；The reception STA refers to the STA for receiving data.
Wherein, the first STA71, is specifically used for: one according to self maintained is used to indicate channel busy above
The parameter vector set of not busy state determines the channel that itself can be used from the channel of distribution；In the one of self maintained
It is used to indicate before the subscription time phase that the parameter vector set of channel busy-idle condition includes expires above, uses itself determining energy
The radio frames of interphase information when the channel used sends comprising available channel and corresponds to the 2nd STA72；And described in receiving
The radio frames of interphase information when the channel comprising this data transmissions and correspondence that the 2nd STA72 is sent；
2nd STA72, interphase information when including available channel and is corresponding sent for receiving the first STA71
Radio frames after, one according to self maintained above be used to indicate the parameter vector set of channel busy-idle condition and receive
Radio frames, the first STA71 of Xiang Suoshu include this data transmissions channel and it is corresponding when interphase information radio frames.
First STA71 is also used to carry out data transmission using the channel that can be used negotiated with the 2nd STA72.
Here, when carrying out data transmission, the first STA71 is specifically used for: when the radio frames received are CTS frame,
The interphase when channel and correspondence that are indicated using the CTS frame, is carried out data transmission with the 2nd STA72；Alternatively, ought receive
When radio frames are DTS frame, before the when interphase of non-serviceable channel expires in the channel of the distribution of DTS frame instruction,
Using in itself available channel except other channels in the channel of the distribution of DTS frame instruction in addition to non-serviceable channel, with
2nd STA72 carries out data transmission；And in the channel of the distribution indicated in the DTS frame non-serviceable channel when
After interphase expires, using the channel for the non-serviceable channel for including DTS frame instruction, counted with the 2nd STA72
According to transmission；Wherein, the DTS frame include in the channel of distribution non-serviceable channel and it is corresponding when interphase information.
First STA71 is also used to monitor the channel of distribution within the set time, and safeguards itself according to snoop results
One above parameter vector set for being used to indicate channel busy-idle condition；
2nd STA72 safeguards itself for monitoring the channel of distribution within the set time, and according to snoop results
One above parameter vector set for being used to indicate channel busy-idle condition.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (17)
1. a kind of method of selection channel in Wireless LAN (WLAN), which is characterized in that this method comprises:
When needing to carry out data transmission, transmitting station and receiving station are used to indicate channel busy according to more than one of self maintained
The parameter vector set of not busy state, all channels that can be used out of when negotiating corresponding in the channel of distribution interphase；Wherein,
In the channel distributed there are non-serviceable channel and it is corresponding when interphase；When corresponding to the non-serviceable channel
After interphase expires, the non-serviceable channel for the transmission of this data negotiated it is corresponding when interphase in the letter that can use
Road；
The transmitting station and the receiving station when corresponding in interphase using all channels that can be used negotiated into
The transmission of row data.
2. the method according to claim 1, wherein the transmitting station and receiving station are according to self maintained
More than one is used to indicate the parameter vector set of channel busy-idle condition, out of when negotiating corresponding in the channel of distribution interphase
All channels that can be used, comprising:
The transmitting station according to one above parameter vector set for being used to indicate channel busy-idle condition of self maintained,
The channel that itself can be used is determined from the channel of distribution；
The transmitting station self maintained it is one more than be used to indicate the parameter vector set packet of channel busy-idle condition
Before the subscription time phase contained expires, sent to the receiving station comprising available letter using the determining channel that itself can be used
The radio frames of interphase information when road and correspondence；
The receiving station is according to one above parameter vector set for being used to indicate channel busy-idle condition of self maintained
And the radio frames received, interphase information is wireless when Xiang Suoshu transmitting station includes the channel of this data transmissions and corresponds to
Frame.
3. according to the method described in claim 2, it is characterized in that, the radio frames that the transmitting station is sent are that request is sent
Frame；Correspondingly, the radio frames that the receiving station is sent are that Clear to Send frame or refusal send frame.
4. according to the method described in claim 3, it is characterized in that,
The request to send frame, the Clear to Send frame and the refusal send channel information and/or corresponding time in frame
The explicit carrying of phase information sends the physical layer frame of frame in the request to send frame, the Clear to Send frame and the refusal
In signaling domain or service-domain in head；Alternatively,
The request to send frame, the Clear to Send frame and the refusal send channel information and/or corresponding time in frame
The explicit carrying of phase information sends the media access of frame in the request to send frame, the Clear to Send frame and the refusal
It controls in (MAC) layer frame head.
5. according to the method described in claim 3, it is characterized in that, when the radio frames that the transmitting station is sent are that request is sent
When the radio frames that frame, the receiving station are sent are Clear to Send frame, implicit wireless by sending of channel information in radio frames
Channel used in frame determines.
6. the method according to claim 1, wherein before the method step, this method further include:
The transmitting station and the receiving station monitor the channel of distribution within the set time, and certainly according to snoop results maintenance
One above parameter vector set for being used to indicate channel busy-idle condition of body.
7. method according to any one of claims 1 to 6, which is characterized in that when the parameter vector set includes: reservation
Interphase, associated channel and the corresponding transmitting-receiving side's site address of the associated channel.
8. method according to any one of claims 1 to 6, which is characterized in that this method further include:
The transmitting station is carried out data transmission using the channel that can be used negotiated with the receiving station.
9. according to the method described in claim 8, it is characterized in that, the transmitting station is using the channel that can be used negotiated
Carry out data transmission with the receiving station, comprising:
When the radio frames received are Clear to Send frame, channel that the transmitting station is indicated using the Clear to Send frame and right
Seasonable interphase carries out data transmission with the receiving station；Alternatively,
It is non-serviceable in the channel that the refusal sends the distribution of frame instruction when the radio frames received are that refusal sends frame
Before the when interphase of channel expires, the transmitting station sends the distribution of frame instruction using the refusal is removed in itself available channel
Channel in other channels outside non-serviceable channel, carry out data transmission with the receiving station；
After the when interphase of non-serviceable channel expires in the channel that the refusal sends the distribution of frame instruction, the dispatching station
Point carries out data biography with the receiving station using the channel for the non-serviceable channel for including the refusal transmission frame instruction
It is defeated；
Wherein, interphase information when the refusal sends non-serviceable channel in the channel that frame includes distribution and corresponds to.
10. according to the method described in claim 9, it is characterized in that, this method further include:
After the when interphase that the refusal sends non-serviceable channel in the channel of the distribution of frame instruction expires, the transmitting station
With the receiving station according to one above parameter vector set for being used to indicate channel busy-idle condition of self maintained, weight
Newly negotiate the channel that can be used.
11. selecting the system of channel in a kind of WLAN, which is characterized in that the system includes: the first website and the second website；Its
In,
First website when for needing to carry out data transmission, is used to indicate with the second website according to more than one of self maintained
The parameter vector set of channel busy-idle condition, all letters that can be used out of when negotiating corresponding in the channel of distribution interphase
Road；Wherein, in the channel distributed there are non-serviceable channel and it is corresponding when interphase；In the non-serviceable channel institute
After interphase expires when corresponding, the non-serviceable channel for this data transmission negotiated it is corresponding when interphase in energy
The channel used；
First website and second website when corresponding in interphase using all channels that can be used negotiated into
The transmission of row data.
12. system according to claim 11, which is characterized in that
First website, is specifically used for: according to one above ginseng for being used to indicate channel busy-idle condition of self maintained
Number vector set determines the channel that itself can be used from the channel of distribution；Self maintained it is one more than for referring to
Before showing that subscription time phase that the parameter vector set of channel busy-idle condition includes expires, the determining channel that itself can be used is used
The radio frames of interphase information when sending comprising available channel and correspond to second website；And it receives second website and sends
The channel comprising this data transmissions and it is corresponding when interphase information radio frames；
Second website, for receive that first website sends comprising available channel and it is corresponding when interphase information it is wireless
After frame, one according to self maintained above be used to indicate the parameter vector set of channel busy-idle condition and receive wireless
Frame, the radio frames of interphase information when the first website of Xiang Suoshu includes the channel of this data transmissions and corresponds to.
13. system according to claim 12, which is characterized in that the radio frames that first website is sent are that request is sent
Frame；Correspondingly, the radio frames that second website is sent are that Clear to Send frame or refusal send frame.
14. system according to claim 11, which is characterized in that first website is also used to supervise within the set time
Listen the channel of distribution, and according to snoop results safeguard itself one above parameter for being used to indicate channel busy-idle condition to
Duration set；
Second website, for monitoring the channel of distribution within the set time, and described in safeguarding itself according to snoop results
More than one is used to indicate the parameter vector set of channel busy-idle condition.
15. 1 to 14 described in any item systems according to claim 1, which is characterized in that the parameter vector set includes: pre-
It makes an appointment phase, associated channel and the corresponding transmitting-receiving side's site address of the associated channel.
16. 1 to 14 described in any item systems according to claim 1, which is characterized in that first website is also used to use
The channel that can be used negotiated carries out data transmission with the second station point.
17. system according to claim 16, which is characterized in that when carrying out data transmission, first website, specifically
For: when the radio frames received are Clear to Send frame, the channel that is indicated using the Clear to Send frame and it is corresponding when interphase, with
The second station point carries out data transmission；Alternatively, sending frame when the radio frames received are that refusal sends frame in the refusal and referring to
Before the when interphase of non-serviceable channel expires in the channel for the distribution shown, sent out using the refusal is removed in itself available channel
Other channels in the channel for the distribution for sending frame to indicate outside non-serviceable channel, carry out data transmission with the second station point；
And in the channel that the refusal sends the distribution of frame instruction after the when interphase of non-serviceable channel expires, using including described
Refusal sends the channel of the non-serviceable channel of frame instruction, carries out data transmission with the second station point；Wherein, the refusal
Interphase information when sending non-serviceable channel in the channel that frame includes distribution and corresponding to.
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| CN106856629B (en) * | 2015-12-08 | 2020-07-21 | 华为技术有限公司 | Data transmission protection method and device |
| CN111787626B (en) * | 2015-12-08 | 2024-02-02 | 华为技术有限公司 | Data transmission protection method and device |
| CN107318171B (en) | 2016-04-26 | 2020-03-27 | 北京佰才邦技术有限公司 | Uplink transmission method, device, user terminal and base station |
| WO2022198546A1 (en) * | 2021-03-25 | 2022-09-29 | Zte Corporation | Methods, apparatuses and systems for triggered transmission opportunity (txop) sharing |
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| CN1925683A (en) * | 2006-09-27 | 2007-03-07 | 杭州华为三康技术有限公司 | Switch-in point of centralized wireless LAN and method for detecting neighbor switch-in point thereof |
| CN102130705A (en) * | 2011-04-20 | 2011-07-20 | 中国电信股份有限公司 | WLAN (Wireless Local Area Network) MESH communication method and device based on fast frequency hopping |
| WO2011111917A1 (en) * | 2010-03-12 | 2011-09-15 | Lg Electronics Inc. | Method and apparatus for protecting a primary service in wlan system |
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| CN1925683A (en) * | 2006-09-27 | 2007-03-07 | 杭州华为三康技术有限公司 | Switch-in point of centralized wireless LAN and method for detecting neighbor switch-in point thereof |
| WO2011111917A1 (en) * | 2010-03-12 | 2011-09-15 | Lg Electronics Inc. | Method and apparatus for protecting a primary service in wlan system |
| CN102130705A (en) * | 2011-04-20 | 2011-07-20 | 中国电信股份有限公司 | WLAN (Wireless Local Area Network) MESH communication method and device based on fast frequency hopping |
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