CN104284408B

CN104284408B - Uplink transmission power calibration method and its relevant device and system

Info

Publication number: CN104284408B
Application number: CN201310275082.6A
Authority: CN
Inventors: 伍天宇; 李云波; 罗毅
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-07-02
Filing date: 2013-07-02
Publication date: 2018-08-21
Anticipated expiration: 2033-07-02
Also published as: WO2015000304A1; CN104284408A

Abstract

This application discloses a kind of uplink transmission power calibration method and its relevant device and system, uplink transmission power calibration method includes：The calibration of power frame that access point is sent is received, calibration of power frame includes target received power and currently transmitted power；According to target received power and currently transmitted power adjustment uplink transmission power, so that reception power of the access point in different sub-carrier or subchannel is in preset difference range.Can solve to receive in upgoing O FDMA communication process different websites uplink transmission power difference it is larger when, it is difficult to the problem of normally receiving all upstream datas, and solving in uplink multi-users input and output（MU‑MIMO）Received in system different websites uplink transmission power difference it is larger when, the larger problem of inter-user interference.

Description

Uplink transmission power calibration method and its relevant device and system

Technical field

This application involves network communication fields, more particularly to uplink transmission power calibration method and its relevant device and are System.

Background technology

Orthogonal frequency division multiple access（Orthogonal Frequency-division Multiple Access, OFDMA）It is just The evolution of frequency multiplexing technique (Orthogonal Frequency Division Multiplexing, OFDM), OFDMA is handed over to connect Enter a series of subcarrier collection that transmission bandwidth is divided the non-overlapping copies being orthogonal by system, different subcarrier collection is distributed to not Same user realizes that multiple access is split that is, by total resources, such as time, bandwidth in frequency, realizes that multi-user diversity increases Benefit improves throughput of system.The application of OFDMA technologies simultaneously is also possible to reduce the collision probability of channel competition, reduces data packet Time delay.Use OFDMA technologies, access point that can receive the data packet from multiple websites simultaneously on the uplink channel.It is this In the case of, in order to be properly received the upstream data of multiple websites in OFDMA symbol, access point needs setting one suitable automatic Gain control value makes all site works in OFDMA symbol in the range of linearity of amplifier, and this requires in OFDMA symbol All websites reach access point power it is close.

The problem of in order to avoid introducing new concealed nodes, in existing upgoing O FDMA communications, without ascending power Control, i.e. access point and node all use fixed transmission power, far and near different during multi-upstream access using this mechanism The channel access information that sends of user reach access point power it is different, the success rate of access can be substantially reduced, such as：

A near-end users and remote subscriber are accessed in same sub-band, and the near-end user signal power that access point receives is long-range In remote subscriber, due to sink effect, near-end user is successfully accessed, remote subscriber access failure；

B near-end users and remote subscriber are accessed in same sub-band, and the near-end user signal power that receives of access point and Remote subscriber signal power is not much different, near-end user and remote subscriber conflict, access failure；

C near-end users and remote subscriber are accessed in different sub-band, and access point is arranged certainly according to the total signal power received Dynamic gain control, the amplification of remote subscriber signal is inadequate, possible access failure.

It, may if the reception power difference in different sub-carrier/subchannel is larger in upgoing O FDMA communication process Lead to lower-powered signal reception failure, also, under this mechanism, it is tired apart from the website access channel of access point farther out Difficulty, and for the closer website of distance, transmission power difficulty is more than the transmission power of actual needs, and power saving performance is poor, And be easy to cause additional interference to other equipment, so receiving the letter that different websites are sent in upgoing O FDMA communication process When number power difference is larger, access point is difficult to normally receive equipped with user data.

Invention content

A kind of uplink transmission power calibration method of the embodiment of the present application offer, equipment and system, it is desirable to solve upgoing O FDMA Received in communication process different websites uplink transmission power difference it is larger when, it is difficult to normally receive asking for all upstream datas Topic, and solve in uplink multi-users input and output（MU-MIMO）The uplink transmission power of different websites is received in system When difference is larger, the larger problem of inter-user interference.

First aspect provides a kind of uplink transmission power calibration method, includes the following steps：Receive the work(that access point is sent Rate calibrates frame, and calibration of power frame includes target received power and currently transmitted power；According to target received power and currently transmitted Power adjustment uplink transmission power, so that reception power of the access point in different sub-carrier or subchannel is in preset difference In range.

In the first possible realization method of first aspect, according to target received power and currently transmitted power adjustment Uplink transmission power includes：The reception power for receiving calibration of power frame is measured, and according to reception power and currently transmitted power meter Calculate the path loss of access point；Target transmission power is calculated according to target received power and path loss；According to target transmission power and hair Bandwidth calculation uplink transmission power is sent, wherein transmission bandwidth includes local transmission bandwidth and the transmission bandwidth of access point.

With reference to first aspect, any one of possible realization method of the first of first aspect, it is possible at second In realization method, receive access point send the calibration of power frame the step of before further include：Current grouping is sent to access point Parameter makes access point generate the website of grouping information setting access channel according to packet parameters, and is connect to each grouping and setting target Power is received, packet parameters include the distance or path loss to access point；The grouping information that access point is sent is received so that station Point is grouped according to grouping information, and grouping information includes the packet number for identifying, each organizing of each group of website for including and right The target received power answered；So that after website receives the calibration of power frame that access point is sent, carried according to calibration of power frame Target received power selects the grouping being currently accessed, so that the target that the grouping being currently accessed is carried according to calibration of power frame Receive power and currently transmitted power adjustment uplink transmission power.

Second of possible realization method with reference to first aspect, in the third possible realization method, when grouping is joined When number changes, corresponding packet number is found according to the packet parameters after variation；Grouping update request is sent to access point Frame, grouping update the packet number that claim frame includes new；It receives the grouping that access point is sent and adjusts frame, grouping adjustment frame includes new Packet number.

Second of possible realization method with reference to first aspect or the third possible realization method, in the 5th kind of possibility Realization method in, receive access point send the calibration of power frame the step of after further include：Using calibration power to access point Compatible request to send frame is sent, so that access point returns to compatible channel idle according to request to send frame can send frame, is asked It includes network allocation vector to ask and send frame；Frame can be sent by receiving the channel idle that access point returns, to ensure to distribute in network The transmitting uplink data of a certain grouping in the time of vector instruction, it includes network allocation vector that channel idle, which can send frame,.

Second aspect provides a kind of uplink transmission power calibration method, includes the following steps：Station into WLAN Point transmission power calibrates frame, so that on target received power and currently transmitted power adjustment that website is carried according to calibration of power frame Row transmission power, to make access point receiving station send upstream data practical reception power difference in preset range It is interior；The upstream data that receiving station is sent according to the uplink transmission power after adjustment.

In the first possible realization method of second aspect, the website transmission power into WLAN calibrates frame The step of before further include：Multiple target received powers are set, and target received power is divided into multiple ranks；To wireless local Website transmission power in net calibrates frame：The calibration of power frame that power is received comprising different target is sent to website, so that After the calibration of power frame comprising some target received power is sent, next power for including another target received power Before calibrating frame transmission, uplink transmission power is less than the website energy contention access channel of the maximum allowable transmission power of website.

In conjunction with the first possible realization method of second aspect, in second of possible realization method, access point to Further include before the step of website transmission power in WLAN calibrates frame：The packet parameters that receiving station is sent, grouping Parameter includes distance or path loss of the website to access point；Determine that the grouping of website, setting are each only according to distance or path loss There is one group of website access channel, and to each grouping and setting target received power；Calibration of power frame further includes packet number, wherein being grouped Number with target received power correspond.

In conjunction with second of possible realization method of second aspect, in the third possible realization method, receiving station Further include after the step of upstream data sent according to the uplink transmission power after adjustment：It is associated with this access when there is new site When point, new site is grouped according to the packet parameters of new site；Frame is calibrated to new site transmission power.

In conjunction with the third possible realization method of second aspect, in the 4th kind of possible realization method, receiving station Further include after the step of upstream data sent according to the uplink transmission power after adjustment：When detecting in this WLAN When there are the packet parameters of website to change to need replacing grouping, the grouping of website is replaced, and grouping adjustment frame is sent to website, Grouping adjusts the packet number that frame includes new.

In conjunction with the 4th kind of possible realization method of second aspect, in the 5th kind of possible realization method, to wireless office Further include after the step of website transmission power in the net of domain calibrates frame：The request to send frame that receiving station is sent, request are sent Frame includes network allocation vector；Frame can be sent according to the request to send frame Return Channel free time, to ensure in network allocation vector The transmitting uplink data of a certain grouping in the time of instruction, it includes network allocation vector that channel idle, which can send frame,.

The third aspect provides a kind of website, including：Calibration of power frame receiving module, the power for receiving access point transmission Frame is calibrated, calibration of power frame includes target received power and currently transmitted power；Uplink transmission power adjusts module, is used for basis Target received power and currently transmitted power adjustment uplink transmission power, so that access point is in different sub-carrier or subchannel Reception power in preset difference range.

In the first possible realization method of the third aspect, calibration of power frame receiving module includes：Measuring unit is used In measuring the reception power for receiving calibration of power frame, and according to receiving power and currently transmitted power calculation to the road of access point Damage；Target transmission power calculation unit, for calculating target transmission power according to target received power and path loss；Uplink sends work( Rate computing unit, for calculating uplink transmission power according to target transmission power and transmission bandwidth, wherein transmission bandwidth includes this The transmission bandwidth of ground transmission bandwidth and access point.

In conjunction with the possible realization method of the first of the third aspect or the third aspect, in second of possible realization method In, website further includes：Packet parameters sending module, for sending current packet parameters to access point, make access point according to point Group parameter generates the website of grouping information setting access channel, and to each grouping and setting target received power, packet parameters include To the distance or path loss of access point；Grouping information receiving module, for receive access point transmission grouping information so that Website is grouped according to grouping information, grouping information include each group of website for including the packet number for identifying, each organizing and Corresponding target received power；So that after website receives the calibration of power frame that access point is sent, carried according to calibration of power frame Target received power select the grouping that is currently accessed so that the mesh that the grouping being currently accessed is carried according to calibration of power frame Tag splice receives power and currently transmitted power adjustment uplink transmission power.

In conjunction with second of possible realization method of the third aspect, in the third possible realization method, website also wraps It includes：Packet lookup module finds corresponding packet number when packet parameters change according to the packet parameters after variation； More new frame sending module is grouped the packet number that update claim frame includes new for sending grouping update claim frame to access point；Point Group update acknowledgement frame receiving module, the grouping for receiving access point transmission adjust frame, are grouped the packet number that adjustment frame includes new.

It is possible at the 4th kind in conjunction with second of the possible realization method or the third possible realization method of the third aspect In realization method, website further includes：Request to send frame sending module, for sending compatible ask to access point using calibration power Transmission frame is sought, so that access point returns to compatible channel idle according to request to send frame can send frame, request to send frame includes Network allocation vector；Channel idle can send frame receiving module, and the channel idle for receiving access point return can be sent Frame, to ensure that the transmitting uplink data of a certain grouping within the time that network allocation vector indicates, channel idle can send frame Including network allocation vector.

Fourth aspect provides a kind of access point, including：Calibration of power frame sending module, for the station into WLAN Point transmission power calibrates frame, so that on target received power and currently transmitted power adjustment that website is carried according to calibration of power frame Row transmission power, to make access point receiving station send upstream data practical reception power difference in preset range It is interior；Upstream data receiving module, the upstream data sent according to the uplink transmission power after adjustment for receiving station.

In the first possible realization method of fourth aspect, access point further includes：Setup module, it is multiple for being arranged Target received power, and target received power is divided into multiple ranks；Calibration of power frame sending module is wrapped for being sent to website The calibration of power frame that power is received containing different target, so as to send it in the calibration of power frame comprising some target received power Afterwards, before next calibration of power frame comprising another target received power is sent, it is maximum that uplink transmission power is less than website Allow the website energy contention access channel of transmission power.

In second of possible realization method of fourth aspect, access point further includes：Packet parameters receiving module, is used for Packet parameters that receiving station is sent, and exporting to grouping module, packet parameters include this website to the distance of access point or Path loss；Grouping module, for being grouped to website according to distance or path loss, only one group of website accesses letter every time for setting Road, and to each grouping and setting target received power；Calibration of power frame further includes packet number, wherein packet number and target received power It corresponds.

In the third possible realization method of fourth aspect, access point further includes：Grouping module has new website for working as When point is associated with this access point, new site is grouped according to the packet parameters of new site；Calibration of power frame sending module is used In to new site transmission power calibrate frame.

In the 4th kind of possible realization method of fourth aspect, access point further includes：Module is replaced in grouping, for when inspection Measuring has the packet parameters of website to change in this WLAN when needing replacing grouping, replaces the grouping of website, and to Website sends grouping adjustment frame, and grouping adjusts the packet number that frame includes new.

In the 5th kind of possible realization method of fourth aspect, access point further includes：Request to send frame receiving module is used In the request to send frame that receiving station is sent, request to send frame includes network allocation vector；Channel idle can send frame transmission Module, for frame can be sent according to the request to send frame Return Channel free time, to ensure the time indicated in network allocation vector The transmitting uplink data of interior a certain grouping, it includes network allocation vector that channel idle, which can send frame,.

5th aspect provides a kind of wireless lan communication system, includes the first to fourth of the third aspect, the third aspect Website described in any one of possible realization method of kind and fourth aspect, first to the 5th kind of possible reality of fourth aspect Access point described in any one of existing mode.

By above-mentioned analysis it is found that the calibration of power frame that website is sent by receiving access point in the present invention, and according to this The target received power and currently transmitted power adjustment uplink transmission power carried in calibration of power frame, so that access point is in difference Reception power on subcarrier or subchannel is in preset difference range；To make in the WLAN that access point receives Each website uplink transmission power difference it is smaller, so as to preferably receive upstream data.

Description of the drawings

Fig. 1 is a kind of flow chart of uplink transmission power calibration method provided in an embodiment of the present invention；

Fig. 2 is a kind of another flow chart of uplink transmission power calibration method provided in an embodiment of the present invention；

Fig. 3 is concealed nodes schematic diagram provided in an embodiment of the present invention；

Fig. 4 is a kind of another flow chart of uplink transmission power calibration method provided in an embodiment of the present invention；

Fig. 5 is a kind of another flow chart of uplink transmission power calibration method provided in an embodiment of the present invention；

Fig. 6 is a kind of flow chart for uplink transmission power calibration method that application examples of the present invention provides；

Fig. 7 is a kind of logical construction schematic diagram of website provided in an embodiment of the present invention；

Fig. 8 is a kind of another logical construction schematic diagram of website provided in an embodiment of the present invention；

Fig. 9 is a kind of logical construction schematic diagram of access point provided in an embodiment of the present invention；

Figure 10 is a kind of another logical construction schematic diagram of access point provided in an embodiment of the present invention；

Figure 11 is a kind of another logical construction schematic diagram of website provided in an embodiment of the present invention；

Figure 12 is a kind of another logical construction schematic diagram of access point provided in an embodiment of the present invention；

Figure 13 is a kind of logical construction schematic diagram of wireless lan communication system provided in an embodiment of the present invention.

Specific implementation mode

The embodiment of the present invention provides uplink transmission power calibration method, corresponding equipment and Wireless Local Area Communication Networks system, Site STA can utilize the uplink transmission power of this website of the calibration of power framing control of access point AP transmissions, so that access point exists Reception power in different sub-carrier or subchannel is in preset difference range；To the wireless local for making access point receive The uplink transmission power difference of each website in net is smaller, so as to preferably receive upstream data.It carries out individually below detailed Explanation.

Referring to Fig. 1, Fig. 1 is a kind of flow chart of uplink transmission power calibration method provided in an embodiment of the present invention.Value It obtains it is noted that in the present embodiment, being illustrated using website as main body, as shown in Figure 1, this method may include following step Suddenly.

101, the calibration of power frame that access point is sent is received.

First, each website transmission power of the access point into WLAN calibrates frame, and access point can be to wireless local Transmission power calibrates frame to each website in net one by one, broadcasting power can also calibrate frame in a wireless local area network, the present invention is not done It limits；Wherein, which includes target received power and currently transmitted power.

Website receives the calibration of power frame that access point is sent.

102, according to target received power and the currently transmitted power adjustment uplink transmission power.

After website receives the calibration of power frame that access point is sent, according to the target received power carried in the calibration of power frame With currently transmitted power adjustment uplink transmission power, to make reception power of the access point in different sub-carrier or subchannel In preset difference range.

In the present embodiment, the calibration of power frame that website is sent by receiving access point, and according in the calibration of power frame The target received power of carrying and currently transmitted power adjustment uplink transmission power, so that access point is in different sub-carrier or son Reception power on channel is in preset difference range；To make access point receive WLAN in each website it is upper Row transmission power difference is smaller, reduces the interference between user, so as to preferably receive upstream data.

Referring to Fig. 2, Fig. 2 is a kind of another flow of uplink transmission power calibration method provided in an embodiment of the present invention Figure.In the present embodiment, it is illustrated using website as main body, as shown in Fig. 2, this method may comprise steps of.

201, the calibration of power frame that access point is sent is received.

Each website transmission power of the access point into WLAN calibrates frame, and access point can be in WLAN Transmission power calibrates frame to each website one by one, broadcasting power can also calibrate frame in a wireless local area network, the present invention does not limit；Its In, which includes target received power and currently transmitted power.

Website receives the calibration of power frame that access point is sent.

202, the reception power that this website receives calibration of power frame is measured, and according to reception power and currently transmitted power Calculate the path loss that this website arrives access point.

After website receives the calibration of power frame that access point is sent, the reception power that local terminal receives the calibration of power frame is measured, And according to path loss of currently transmitted this website of power calculation carried in power and calibration of power frame to access point is received, specifically 's：

Path loss=currently transmitted power-reception power.

203, target transmission power is calculated according to target received power and path loss.

After calculating path loss of the local terminal to access point, website calculates oneself further according to target received power and path loss and thinks The target transmission power wanted, specifically：

Target transmission power=target received power+path loss.

204, uplink transmission power is calculated according to the transmission bandwidth of target transmission power, transmission bandwidth and this website., wherein Transmission bandwidth includes local transmission bandwidth and the transmission bandwidth of access point.

Website is based on target transmission power and calculates uplink transmission power, the transmission bandwidth of this website and the transmission band of access point Width be it is known and be pre-stored in it is local, specifically：

The transmission bandwidth of the transmission bandwidth/access point of uplink transmission power=target transmission power × this website.

205, judge whether uplink transmission power is more than the preset threshold value of this website.

The uplink transmission power that website is calculated in step 204 is possible to that the preset thresholding of this website can be more than Value, if it does, this website can not just carry out the transmission of upstream data with the uplink transmission power, this threshold value can be this The transmission upper limit or regulation the limitation power of website or other preset power；So sending work(calculating uplink After rate, need to judge whether uplink transmission power is more than the preset threshold value of this website, if uplink transmission power is more than The preset threshold value of this website, thens follow the steps 206, if row transmission power is not more than the preset thresholding of this website Value, thens follow the steps 207.

206, upstream data transmission is carried out using the preset threshold value of this website as uplink transmission power.

If judging that uplink transmission power is more than the preset threshold value of this website in step 205, our station is used The preset threshold value of point carries out upstream data transmission as uplink transmission power.

207, upstream data is sent using uplink transmission power.

If judging that uplink transmission power is not more than the preset threshold value of this website in step 205, step is used Rapid 204 uplink transmission powers being calculated send upstream data.

In practical application, under the larger scene of the coverage area of base station sub-system, the target that is calculated in step 203 Transmission power is larger for the website closer apart from access point and apart from the possible difference of the website of access point farther out, if ensured close The performance of end station point reaches best, then the uplink transmission power of remote station may exceed preset threshold value, such as send out Serve limit or regulation limitation power；On the contrary, if ensureing that the uplink transmission power of remote station is no more than preset door Limit value, then the performance of proximal end website may be very poor, this is because in order to ensure that the uplink transmission power of remote station is not super pre- The threshold value first set, then access point can only select a smaller target received power, to can only also select proximal end website Select lower modulation coding scheme.

It is therefore desirable to try that website is allowed to be finely adjusted the uplink transmission power being calculated to solve the above problems. In practical operation, the uplink transmission power that access point is not required for all websites received is completely the same, allows one to move The range of state variation, so, website can be finely adjusted uplink transmission power in the range of access point allows.Another In embodiment, calibration of power frame further includes power dynamics range instructions field, and website can be according to power dynamics range Instructions field is finely adjusted uplink transmission power.Wherein, power dynamics range instructions field can refer in calibration of power frame Show, can also individually be indicated within a beacon frame with an element, the present invention is not limited.

If judging that uplink transmission power is not more than the preset threshold value of this website in step 205, take described Between the value that transmission power dynamic range instructions field is added with target transmission power, with the preset threshold value of this website Compared to the minimum value after relatively, upstream data transmission is carried out as the uplink transmission power after fine tuning.Certainly, in practical applications, Website can also select a suitable power as uplink transmission power, this hair according to the needs of uplink modulation coding scheme It is bright not to be limited.

So by allowing website to be finely adjusted uplink transmission power, ensureing the website apart from access point farther out In the case of the not super preset threshold value of uplink transmission power, the website closer apart from access point can be allow to use higher Transmission power and higher modulation coding scheme, to obtain better performance, such as have better throughput.

In practical applications, if the target received power that is arranged in calibration of power frame of access point is bigger than normal, can make away from It is excessive from the transmission power that the website of access point farther out needs, beyond the maximum transmission power allowed, to be successfully accessed； If target received power to be arranged too small, the website closer apart from access point can only use lower modulating-coding side Formula, throughput reduce, and are unable to reach optimum performance.

In another embodiment, before website executes step 201, current packet parameters are sent to access point first, In, packet parameters include the distance or path loss that this website arrives access point；

After access point receives packet parameters, it is grouped according to the website that the packet parameters are WLAN, setting is every Secondary only one group of website accesses channel, and to each grouping and setting target received power, then all websites into WLAN Transmission power calibrates frame, which includes target received power, currently transmitted power and grouping information, grouping information packet Include site identity, packet number, wherein site identity, packet number and target received power correspond to.Certain grouping information can also be single It solely sends and is not included in calibration of power frame, when individually sending, grouping information includes the mark for the website that this grouping includes, divides Group number and corresponding target received power.

Website receives the grouping information that access point returns, and the grouping information is stored in local, and grouping information includes every The packet number for identifying, each organizing and correspondence target received power of a group of website for including.Specifically, website receives access point hair For the grouping information sent so that website is grouped according to grouping information, grouping information includes the mark of each group of website for including The packet number know, each organized and corresponding target received power, so that after website receives the calibration of power frame that access point is sent, The target received power carried according to the calibration of power frame selects the grouping being currently accessed, so that the grouping being currently accessed The target received power and currently transmitted power adjustment uplink transmission power carried according to calibration of power frame.

Further, when the packet parameters of this website change, according to the packet parameters after variation in grouping information In find corresponding packet number, then to access point send grouping update claim frame, make access point according to grouping update request Frame is that the website updates grouping, and returns to grouping adjustment frame, wherein grouping updates the packet number that claim frame includes new.

Website receives the grouping that access point is sent and adjusts frame, wherein grouping adjusts the packet number that frame includes new.

Adjustment grouping, which can also be, to be dominated by access point end, specifically：

When the packet parameters of website change, new parameter is first sent from the website to access point, for example, when station When large change needs update grouping occurs for the path loss that point detects local terminal to access point, new path loss is reported to access point；With Access point is set to be grouped for the update of this website according to the new parameter of reception, specifically：

Rule of classification, i.e. packet parameters and corresponding packet number are locally preserved in access point, access point is according to new ginseng Number searches packet number corresponding with the parameter, as new packet number.

After access point finds new packet number, grouping adjustment frame is sent to this website, wherein grouping adjustment frame includes new Packet number；

Website receive access point send grouping adjust frame, according to the grouping adjust frame update grouping, and according to update after Grouping corresponding target received power adjust uplink transmission power.

In the aforementioned embodiment, access point control website carries out the access of up channel using different uplink transmission powers With the transmission of upstream data, to solve in upgoing O FDMA communication process, access point receives the signal that different websites are sent When power difference is larger, it is difficult to the problem of normally receiving the upstream data of all websites.

But when the website transmission power difference in WLAN, it is possible to which the problem of causing concealed nodes works as When the uplink transmission power of a certain website is smaller, the website of surrounding may can't detect the website and currently carry out upstream data Transmission and think present channel free time, so as to cause channel access compete.

As shown in figure 3, AP1 is circle 1 using the covering of total power transmission data, AP2 is covered using total power transmission data Lid is circle 3, and STA1 is virtual coil 4 using the covering of total power transmission data, and AP2 is the concealed nodes of AP1, if STA1 is with entirely Power transmission data, then AP2 can hear the signal of STA1, be not the concealed nodes of STA1.But if STA1 uses calibration Uplink transmission power afterwards is sent, and when the uplink transmission power after the calibration is less than itself total power, such as 2 institutes of circle Showing, then AP2 cannot hear STA1 just in transmission data, and think the present channel free time, using total power transmission data, in this way, Sending and receiving for STA1 upstream datas can then be interfered.In order to solve the problems, such as above-mentioned stealthy node, present invention further propose that Following solution：

Before website carries out channel access or transmission data using the uplink transmission power after adjustment, standard is first used Power sends a request and sends（Request to send, RTS）Frame is for being arranged suitable network allocation vector（Network Allocation Vector, NAV）.After access point receives the RTS frames, compatible channel idle is responded using calibration power It can send（Clear tosend, CTS）Frame is also provided with the identical domains NAV in the CTS frames, which is used to indicate one Transmitting uplink data of the section time for the website of a certain uplink transmission power, all websites for enabling this access point to cover Within this time will not transmission data, to ensure that the transmitting uplink data of website of a certain uplink transmission power will not be by The interference of other websites.

Further, whether access point is carried out using the bit instruction website not used currently based on upper in CTS frames The channel competition of row OFDMA, such as using retry or more data as indicating bit, such as more data is 1, Indicate that website can carry out the channel competition of OFDMA modes in above-mentioned protective time slot, be carried out at the same time the data of power control Transmission, to improve spectrum utilization efficiency.

Can be that the scene of OFDMA connects it should be noted that in uplink transmission power calibration method provided in this embodiment Enter, can also be uplink MU-MIMO scenes and the common power control scene of other non-OFDMA modes, do not limit herein System.

Referring to Fig. 4, Fig. 4 is a kind of another flow of uplink transmission power calibration method provided in an embodiment of the present invention Figure.Wherein the present embodiment is illustrated using access point as main body, as shown in figure 4, this method may comprise steps of.

401, each website transmission power into WLAN calibrates frame.

Each website transmission power of the access point into WLAN calibrates frame, which includes intended recipient work( Rate and currently transmitted power, after each website receives the calibration of power frame, according to target received power and currently transmitted power adjustment Uplink transmission power, to make access point receive different websites send upstream datas practical reception power difference preset In smaller range, to achieve the purpose that all customer data can be normally received.

402, the upstream data that each website is sent according to the uplink transmission power after adjustment is received.

Website sends upstream data using the uplink transmission power adjusted to access point, access point receive each website according to The upstream data that uplink transmission power after adjustment is sent.

In the present embodiment, each website transmission power of the access point point into WLAN calibrates frame, makes each website root According to the transmission power of the calibration of power framing control local terminal, actually connecing for upstream data is sent to make access point receive different websites The difference of power is received in preset smaller range, different stations are received in upgoing O FDMA communication process to solve The problem of difference of the practical reception power of point transmission data is difficult to normally receive user data when excessive, reaching normally to connect Receive the purpose of all customer data.

It is worth noting that, in the alternative embodiment of the present invention, the quantity of website can be one, at this point, access point Website transmission power into WLAN calibrates frame, and receives what the website was sent according to the uplink transmission power after adjustment Upstream data.

Referring to Fig. 5, Fig. 5 is a kind of another flow of uplink transmission power calibration method provided in an embodiment of the present invention Figure.Wherein the present embodiment is illustrated using access point as main body, as shown in figure 5, this method may comprise steps of.

501, the packet parameters that each website is sent are received.

Access point receives the packet parameters that each website in WLAN is sent, which includes each website to connecing The distance or path loss of access point.

502, each website is grouped according to packet parameters, only one group of website accesses channel every time for setting, and to each Grouping and setting target received power.

Access point receives the packet parameters that each website is sent, i.e., after each website to the distance of access point or path loss, according to The distance or path loss are grouped each website, this access point is arranged, and only one group of website is accessed using OFDMA modes every time Channel, and to each grouping and setting target received power, i.e., mapping relations are arranged in the packet number of each grouping and target received power.

503, each website transmission power of the access point into WLAN calibrates frame.

Each website transmission power of the access point into WLAN calibrates frame, which includes the station of each grouping Point, the currently transmitted power for being respectively grouped corresponding target received power, access point.The calibration of power frame further includes that power dynamic becomes Change range instructions field, website can be finely adjusted uplink transmission power according to power dynamics range instructions field.Wherein, work( Rate dynamic range instructions field can indicate in calibration of power frame, can also individually be referred within a beacon frame with an element Show, the present invention is not limited.

504, the RTS frames that receiving station is sent.

Uplink transmission power after website is using calibration is sent, and the uplink transmission power after the calibration is less than certainly When the total power of body, it is possible to the problem of stealthy node occur, in order to solve this problem, introduce RTS/ in the present embodiment CTS agreements, specifically, first, website sends a RTS frame for suitable NAV to be arranged using calibration power, is used to indicate one Transmitting uplink data of the section time for the website of a certain uplink transmission power, access point receive the RTS frames.

505, CTS frames are returned to according to RTS frames.

After the RTS frames that access point receiving station is sent, compatible CTS frames are responded using calibration power, in the CTS frames, The identical domains NAV are also provided with, which is used to indicate upstream data of a period of time for the website of a certain uplink transmission power Transmission, enable all websites that this access point covers within this time will not transmission data, to ensure a certain uplink The transmitting uplink data of the website of transmission power will not be interfered by other websites.

506, one access group instruction frame of website broadcast of the access point into this WLAN, which is used to indicate, can currently access channel Grouping.

Because it is different to be each grouped corresponding target received power, in section at the same time, one group of website can only be allowed Channel is accessed, to ensure normally receiving for upstream data.In step 505, it is arranged in the CTS that access point is sent in a wlan The domains NAV ensure that in the period as defined in the domains NAV that only having one group of website that can access channel carries out transmitting uplink data.Access And then one access group instruction frame of the website broadcast into WLAN is used to indicate the grouping that can currently access channel to point, so as to Ensure normally receiving for the packet uplink data.

507, the upstream data that each website is sent according to the uplink transmission power after adjustment is received.

In the period as defined in the domains NAV, access point receives each website in a certain grouping and is sent according to the uplink after adjustment The upstream data that power is sent.

508, it judges whether there is new site and is associated with this access point, or whether there are the packet parameters of website to change to need Replace grouping.

In a wlan, it is possible to have new site at any time and is associated with this access point or there are the packet parameters of website to become Change needs replacing grouping, and access point needs whether periodic monitor has new site to be associated with this access point, or whether has website Packet parameters, which change, needs replacing grouping.

509, when having monitored that new site is associated with this access point, the new website is clicked through according to the packet parameters of new site Row grouping.

510, when monitoring that there are the packet parameters of website to change in this WLAN needs replacing grouping, the website is replaced Grouping, and send grouping adjustment frame to the website, wherein grouping adjustment frame includes new packet number.

511, frame is calibrated to website transmission power.

When having monitored that new site is associated with this access point, the new site is divided according to the packet parameters of new site Then group calibrates frame to the website transmission power；Needs are changed when monitoring to have in this WLAN the packet parameters of website more When changing grouping, the grouping of the website is replaced, then calibrates frame to the website transmission power.

It is worth noting that, in the alternative embodiment of the present invention, the quantity of website can be one, at this point, access point Above-mentioned data exchange is carried out with single website.

Further, if access point using power control techniques carry out downlink data transmission, first use calibration power to Website sends compatible request to send frame, and after website receives the request to send frame, compatible letter is returned according to the request to send frame The road free time can send frame, wherein request to send frame includes network allocation vector；The channel idle that access point receiving station returns Frame can be sent, to ensure the downlink data transmission of a certain grouping within the time that network allocation vector indicates, wherein channel is empty It includes network allocation vector that spare time, which can send frame,.

In another embodiment, target received power is divided into several ranks by access point before transmission power calibrates frame, Then the calibration of power frame for receiving power comprising different target is sent according to certain rule, and work(is being received comprising a certain ranking subject After the calibration of power frame of rate is sent, before the transmission of next calibration of power frame, only it is pre- to be less than this website for uplink transmission power The website of the threshold value first set can participate in channel competition, be accessed.According to the method, target received power is smaller When, remote station has access to, if proximal end website accesses, can only use lower transmission power and modulation coding scheme, It is less efficient.When target received power is larger, remote station can not access, and proximal end website can use higher transmission power And modulation coding scheme, spectrum utilization efficiency are higher.All websites being had access under some target received power are classified as One group, since the website closer apart from access point can access under different target received power settings, can by comprising In multiple groups.It can ensure have an opportunity to access apart from the website of access point farther out under this mechanism, improve apart from access point The success rate of website access farther out.

But according to above-mentioned packet mode, it is only capable of being included in less group apart from the website of access point farther out, access Probability is less than proximal end website.In another embodiment, the website closer apart from access point when limited target reception power is smaller Access, such as access point can carry a uplink transmission power lower limit in calibration of power frame, when website calculates local terminal When uplink transmission power is less than uplink transmission power lower limit, the website is not allowed to carry out channel access.Which improves frequency spectrums Utilization ratio, while also improving the fairness between access point website farther out and the website closer apart from access point.

In the present embodiment, each website transmission power of the access point point into WLAN calibrates frame, makes each website root According to the transmission power of the calibration of power framing control local terminal, actually connecing for upstream data is sent to make access point receive different websites The difference of power is received in preset smaller range, different stations are received in upgoing O FDMA communication process to solve The problem of difference of the practical reception power of point transmission data is difficult to normally receive user data when excessive, reaching can normally receive The purpose of all customer data.And it is further, the website in WLAN is grouped, different targets is arranged to each grouping Power is received, maximum operation transmission power may be exceeded according to the calculated uplink transmission power of calibration of power frame to solve website And the problem of influencing the transmission of upstream data.And it is further, new concealed nodes may be brought to ask to introducing power control Topic carries the RTS/CTS frames in the domains NAV to avoid a certain group from being sent in upstream data by introducing RTS/CTS agreements by transmission When, other groupings also carry out data transmission, so as to avoid hidden node problem.

Below by a concrete application example, the present invention will be described in more detail.Referring to Fig. 6, Fig. 6 is this hair A kind of flow chart for uplink transmission power calibration method that bright application examples provides.As shown in fig. 6, this method is specific：

Such as in the WLAN of the application example, setting there are one access point, n-1 website, number respectively slave site 1, arrive Website n-1.Access point and n-1 website have a up-down data exchange, in the application example, for the convenience of description, only intercept stations The up-down data exchange between 1 and access point is put to specifically describe.

1, packet parameters are sent.

Each website in WLAN sends packet parameters to access point first, the packet parameters can be website to access point it Between path loss or website the distance between to access point.

2, packet parameters are received and each website is grouped according to packet parameters.

Access point receives the packet parameters of each website, and is grouped to each website according to packet parameters, such as path loss exists It is classified as one group within 50db, path loss is classified as one group again in 50db between 70db, and the visual actual conditions of rule of classification carry out Setting, is not limited herein.

3, transmission power calibrates frame.

Calibration of power frame is broadcast to all websites by access point, wherein calibration of power frame includes that calibration of power frame includes each The website of grouping, the currently transmitted power for being respectively grouped corresponding target received power, access point.The calibration of power frame further includes work( Rate dynamic range instructions field, website can carry out uplink transmission power according to power dynamics range instructions field micro- It adjusts.Wherein, power dynamics range instructions field can indicate in calibration of power frame, can also be individually within a beacon frame with one A element instruction, the present invention are not limited.

The each grouping of dispatch of taking turns carries out multi-upstream access to access point according to preset rules.

The target received power that access point can also broadcast the grouping information of all websites first and each be grouped, retransmits Calibration of power frame is to indicate which grouping can access channel.

4, it receives calibration of power frame and calculates uplink transmission power.

Website 1 receives calibration of power frame and calculates uplink transmission power, specifically：

First, after website 1 receives the calibration of power frame that access point is sent, the reception that local terminal receives the calibration of power frame is measured Power, and according to the path loss for receiving currently transmitted this website of power calculation carried in power and calibration of power frame and arriving access point, Specifically：

Path loss=currently transmitted power-reception power.

Then, after calculating path loss of the local terminal to access point, website 1 calculates certainly according to target received power and path loss The target transmission power that oneself wants, specifically：

Target transmission power=target received power+path loss.

Finally, website 1 is based on target transmission power and calculates uplink transmission power, the transmission bandwidth of this website and access point Transmission bandwidth be it is known and be pre-stored in it is local, specifically：

5, RTS frames are sent.

Uplink transmission power after website is using calibration is sent, and the uplink transmission power after the calibration is less than certainly When the total power of body, it is possible to the problem of stealthy node occur, in order to solve this problem, introduce RTS/ in the present embodiment CTS agreements, specifically, first, website sends a RTS frame for suitable NAV to be arranged using calibration power, is used to indicate one Transmitting uplink data of the section time for the website of a certain uplink transmission power.

6, CTS frames are returned.

7, it broadcasts an access group instruction frame and is used to indicate the grouping that can currently access channel.

Because it is different to be each grouped corresponding target received power, in section at the same time, one group of website can only be allowed Channel is accessed, to ensure normally receiving for upstream data.All preparations are being carried out, before channel access being carried out, are being connect Access point broadcasts an access group instruction frame and is used to indicate the grouping that can currently access channel.

8, judge whether uplink transmission power is more than the preset threshold value of this website.

The uplink transmission power being calculated in step 4 is possible to that the preset threshold value of this website can be more than, if It is more than, this website can not just carry out the transmission of upstream data with the uplink transmission power, this threshold value can be this website Send the upper limit or regulation limitation power or other preset power；So after calculating uplink transmission power, It needs to judge whether uplink transmission power is more than the preset threshold value of this website, if uplink transmission power is more than this website Preset threshold value then uses the preset threshold value of this website to carry out upstream data hair as uplink transmission power It send, if uplink transmission power is not more than the preset threshold value of this website, uses the uplink transmission power being calculated Send upstream data.

In practical application, under the larger scene of the coverage area of base station sub-system, website is calculated according to calibration of power frame Obtained target transmission power for the website closer apart from access point and apart from the website of access point farther out may difference compared with Greatly, if ensureing that the performance of proximal end website reaches best, the uplink transmission power of remote station may exceed preset Threshold value, such as send the upper limit or regulation limitation power；On the contrary, if ensureing that the uplink transmission power of remote station is no more than Preset threshold value, then the performance of proximal end website may be very poor, this is because in order to ensure the uplink hair of remote station Send power not super preset threshold value, then access point can only select a smaller target received power, to proximal end Website can only also select lower modulation coding scheme.

It is therefore desirable to try that website is allowed to be finely adjusted the uplink transmission power being calculated to solve the above problems. In practical operation, the uplink transmission power that access point is not required for all websites received is completely the same, allows one to move The range of state variation, so, website can be finely adjusted uplink transmission power in the range of access point allows.Specifically Solution is also to carry power dynamics range instructions field in calibration of power frame, website can become according to power dynamic Change range instructions field to be finely adjusted uplink transmission power.Wherein, power dynamics range instructions field can be in the calibration of power It indicates, can also individually be indicated within a beacon frame with an element, the present invention is not limited in frame.

If website judges that uplink transmission power is not more than the preset threshold value of this website, the transmission work(is taken The value that rate dynamic range instructions field is added with target transmission power, between the preset threshold value of this website compared with Minimum value afterwards carries out upstream data transmission as the uplink transmission power after fine tuning.Certainly, in practical applications, website A suitable power can be selected as uplink transmission power according to the needs of uplink modulation coding scheme, the present invention is not done Limitation.

9.1, upstream data is sent using the preset threshold value of this website as uplink transmission power.

If judging that uplink transmission power is more than the preset threshold value of this website in step 8, this website is used Preset threshold value sends upstream data as uplink transmission power.

9.2, upstream data is sent using uplink transmission power.

If judging that the uplink transmission power after uplink transmission power or fine tuning is advance no more than this website in step 8 The threshold value of setting then uses the uplink transmission power after uplink transmission power or fine tuning to send upstream data.

10, upstream data is received.

Access point receives the upstream data that each website being currently accessed in the grouping of channel is sent.

11, website n sends packet parameters.

New association website n sends packet parameters to access point.

12, it determines whether there is new site and is associated with this access point.

Access point determines whether there is new site and is associated with this access point.

13, transmission power calibrates frame after being grouped.

Access point receives the packet parameters that new association website n is sent, and judges to have new station associate to this access point, According to the packet parameters of reception by after new associated website grouping, frame is calibrated to website n transmission powers, which includes The website that is respectively grouped, the currently transmitted power for being respectively grouped corresponding target received power, access point.The calibration of power frame further includes Power dynamics range instructions field, website can carry out uplink transmission power according to power dynamics range instructions field micro- It adjusts.Wherein, power dynamics range instructions field can indicate in calibration of power frame, can also be individually within a beacon frame with one A element instruction, the present invention are not limited.

14, website 1 sends newer packet parameters.

Website 1 monitors that the packet parameters of this website change, and newer packet parameters are sent to access point.

15, the packet parameters for determining whether there is website change and need replacing grouping.

The packet parameters that access point determines whether there is website change and need replacing grouping.

16, transmission power calibrates frame after replacing grouping.

After the updated packet parameters that access point receiving station 1 is sent, judges that website 1 needs replacing grouping, will stand Point 1 replaces grouping, and sends the calibration of power frame of new grouping, which includes the website of each grouping, each grouping pair The currently transmitted power of the target received power, access point answered.The calibration of power frame further includes the instruction of power dynamics range Domain, website can be finely adjusted uplink transmission power according to power dynamics range instructions field.Wherein, power dynamic becomes Changing range instructions field can indicate in calibration of power frame, can also individually be indicated within a beacon frame with an element, the present invention It is not limited.

In the above application examples, in such a way that display is grouped, i.e., each website knows which grouping this website belongs to.Access Point can also reach same effect using stealthy packet mode, specifically：

Target received power is divided into several ranks by access point before transmission power calibrates frame, then according to a set pattern Rule sends the calibration of power frame that power is received comprising different target, in the calibration of power frame for receiving power comprising a certain ranking subject After transmission, before the transmission of next calibration of power frame, only uplink transmission power is less than the preset threshold value of this website Website can participate in channel competition, accessed.According to the method, when target received power is smaller, remote station can Access can only use lower transmission power and modulation coding scheme if proximal end website accesses, less efficient.Work as target When reception power is larger, remote station can not access, and proximal end website can use higher transmission power and modulation coding scheme, Spectrum utilization efficiency is higher.All websites being had access under some target received power are classified as one group, since distance connects The closer website of access point can access under different target received power settings, can be contained in multiple groups.It is this It can ensure have an opportunity to access apart from the website of access point farther out under mechanism, improve the website access apart from access point farther out Success rate.

Referring to Fig. 7, Fig. 7 is a kind of logical construction schematic diagram of website provided in an embodiment of the present invention.As shown in fig. 7, The website includes：

Calibration of power frame receiving module 701, the calibration of power frame for receiving access point transmission, and export to uplink and send Power regulation module 702, the calibration of power frame include target received power and currently transmitted power；

Uplink transmission power adjusts module 702, is used for the target received power according to reception and currently transmitted power adjustment Uplink transmission power, so that reception power of the access point in different sub-carrier or subchannel is in preset difference range.

In the present embodiment, the calibration of power frame that website is sent by receiving access point, and according in the calibration of power frame The target received power of carrying and currently transmitted power adjustment uplink transmission power, so that access point is in different sub-carrier or son Reception power on channel is in preset difference range；To make access point receive WLAN in each website it is upper Row transmission power difference is smaller, so as to preferably receive upstream data.

Referring to Fig. 8, Fig. 8 is a kind of another logical construction schematic diagram of website provided in an embodiment of the present invention.Such as Fig. 8 institutes Show, which includes：

Packet parameters sending module 801, for for sending current packet parameters to access point, make access point according to point Group parameter generates the website of grouping information setting access channel, and to each grouping and setting target received power, packet parameters include To the distance or path loss of access point.

Grouping information receiving module 802, for receive access point transmission grouping information so that website according to grouping Information is grouped, and grouping information includes that the packet number for identifying, each organizing of each group of website for including and corresponding target connect Receive power；So that after website receives the calibration of power frame that access point is sent, according to the intended recipient work(of calibration of power frame carrying Rate selects the grouping that is currently accessed so that the target received power that is carried according to calibration of power frame of the grouping being currently accessed with Currently transmitted power adjustment uplink transmission power.

Calibration of power frame receiving module includes：

Measuring unit 8031 receives the reception power of the calibration of power frame for measuring this website, and according to the reception Power and currently transmitted this website of power calculation arrive the path loss of access point, and export to target transmission power calculation unit 8032.

Target transmission power calculation unit 8032, for calculating target transmission power according to target received power and path loss, And it exports to uplink transmission power calculation unit 8033.

Uplink transmission power computing unit 8033 sends work(for calculating uplink according to target transmission power and transmission bandwidth Rate, wherein transmission bandwidth include local transmission bandwidth and the transmission bandwidth of access point, and export uplink transmission power to uplink and send out Send power regulation module 804.

Uplink transmission power adjusts module 804, is used for the target received power according to reception and currently transmitted power adjustment Uplink transmission power, and export to uplink transmission power and finely tune module 805, so that access point is in different sub-carrier or son letter Reception power on road is in preset difference range.

Further, calibration of power frame further includes power dynamics range instructions field；Website in the present embodiment also wraps It includes：

Uplink transmission power finely tunes module 805, for being sent to the uplink according to power dynamics range instructions field Power is finely adjusted, so that this website carries out upstream data transmission using the uplink transmission power after fine tuning.

Further, the website in the present embodiment further includes：

Packet lookup module 806, for when the packet parameters of this website change, according to the packet parameters after variation Corresponding packet number is found, and is exported to more new frame sending module 807.

More new frame sending module 807, for sending grouping update claim frame to access point, wherein grouping update claim frame Including new packet number.

Grouping update acknowledgement frame receiving module 808, the grouping for receiving access point transmission update acknowledgement frame.

Further, the website in the present embodiment further includes：

New parameter sending module 809, for when the packet parameters of this website change, new ginseng to be sent to access point Number, so that the access point is the update grouping of this website according to the new parameter of reception, and sends grouping adjustment frame to this website, Middle grouping adjusts the packet number that frame includes new.

It is grouped update module 810, the grouping for receiving access point transmission adjusts frame, and adjusts frame update according to the grouping Grouping.

It should be noted that the module 806,807,808 and 809 and 810 in Fig. 8 in dotted line frame, is that website end is leading The leading switching of switching grouping and access point end is grouped the corresponding function module of two ways, in practical applications, in the same time, Only a kind of mode is used, i.e., only there are one the module group of dotted line frame is active.The module group of two dotted line frames can be same When exist, but the same time is only active there are one the module group of dotted line frame.

Further, the website in the present embodiment further includes：

Request to send frame sending module 811, for sending compatible request to send frame to access point so that access point according to The request to send frame, which returns to compatible channel idle, can send frame, wherein request to send frame includes network allocation vector.

Channel idle can send frame receiving module 812, and the channel idle for receiving access point return can be sent Frame, to ensure that the transmitting uplink data of a certain grouping within the time that network allocation vector indicates, wherein channel idle can be sent out It includes network allocation vector to send frame.

In the present embodiment, the calibration of power frame that website is sent by receiving access point, and taken according in the calibration of power frame The target received power of band and currently transmitted power adjustment uplink transmission power, so that access point is in different sub-carrier or son letter Reception power on road is in preset difference range；The uplink of each website in WLAN to make access point reception Transmission power difference is smaller, so as to preferably receive upstream data.And it is respectively connected to channel by the way that website to be grouped, Channel is accessed simultaneously apart from excessive website to avoid with access point, so as to preferably receive data.

Referring to Fig. 9, Fig. 9 is a kind of logical construction schematic diagram of access point provided in an embodiment of the present invention.Such as Fig. 9 institutes Show, which includes：

Calibration of power frame sending module 901 calibrates frame, so that website for the website transmission power into WLAN The target received power and currently transmitted power adjustment uplink transmission power carried according to calibration of power frame, to make access point connect The difference of the practical reception power of website transmission upstream data is received in default range.

Upstream data receiving module 902, the uplink sent according to the uplink transmission power after adjustment for receiving each website Data.

In the present embodiment, each website transmission power of the access point point into WLAN calibrates frame, makes each website root According to the transmission power of the calibration of power framing control local terminal, actually connecing for upstream data is sent to make access point receive different websites The difference of power is received in preset smaller range, different stations are received in upgoing O FDMA communication process to solve The problem of difference of the practical reception power of point transmission data is difficult to normally receive user data when excessive, reaching can normally receive The purpose of all customer data.

Referring to Fig. 10, Figure 10 is a kind of another logical construction schematic diagram of access point provided in an embodiment of the present invention.Such as Shown in Figure 10, which includes：

Setup module 1001 is divided into several ranks for multiple target received powers to be arranged, and by the target received power.

Transmission power lower limit broadcast module 1002 is used for the broadcast station transmission power lower limit in this WLAN, from And the website progress channel access that refusal uplink transmission power is less than the transmission power lower limit is set.

Packet parameters receiving module 1003, the packet parameters sent for receiving each website, and export to grouping module, and Output to grouping module 1004, wherein packet parameters includes the distance or path loss that this website arrives access point.

Grouping module 1004, for being grouped to each website according to distance or path loss, setting only has one group of station every time Point access channel, and to each grouping and setting target received power.

It should be noted that 1001,1002 modules and 1003,1004 modules in dotted line frame are to the website in WLAN The two ways being grouped, 1001,1002 modules are the corresponding modules of recessive packet mode, and 1003,1004 modules are displays The corresponding module of packet mode, in the same time, access point only uses a kind of packet mode, i.e., and 1001,1002 in dotted line frame Module and 1003,1004 modules can exist simultaneously, but in the same time, only one group of module is to be in active state 's.

Calibration of power frame sending module 1005, for for sending the power school for receiving power comprising different target to website Quasi- frame, so that after the calibration of power frame comprising some target received power is sent, next includes another intended recipient Before the calibration of power frame of power is sent, uplink transmission power is less than the website energy contention access of the maximum allowable transmission power of website Channel.

Upstream data receiving module 1009, the uplink sent according to the uplink transmission power after adjustment for receiving each website Data.

Further, access point further includes：

RTS frames receiving module 1006, the RTS frames sent for receiving station, wherein RTS frames include network allocation vector.

CTS frames sending module 1007, for frame can be sent according to the RTS frame Return Channel free time, to ensure in the net The transmitting uplink data of a certain grouping in the time of network allocation vector instruction, wherein CTS frames include the network allocation vector.

Access group indicates frame broadcast module 1008, and an access group instruction is broadcasted for the website into this WLAN Frame is used to indicate the grouping that can currently access channel, and wherein access group instruction frame includes packet number.

Further, the access point in the present embodiment further includes：

Request to send frame sending module, for the request to send frame that receiving station is sent, request to send frame includes network point With vector.

Channel idle can send frame module, for receiving station return channel idle can send frame, with ensure, The downlink data transmission of a certain grouping in the time of network allocation vector instruction, wherein it includes net that channel idle, which can send frame, Network allocation vector.

Please refer to Fig.1 the another logical construction schematic diagram that 1, Figure 11 is a kind of website provided in an embodiment of the present invention.Figure 11 Website 1101 include processor 1201, memory 1202 and receiver 1203.Processor 1201, memory 1202 and receiver 1203 are connected by bus system 1204.

Receiver 1203 be used for receive access point transmission calibration of power frame, calibration of power frame include target received power and Currently transmitted power.

Memory 1202 is for storing so that processor 1201 executes the instruction operated below：According to target received power and Currently transmitted power adjustment uplink transmission power, so that reception power of the access point in different sub-carrier or subchannel is pre- If difference range in.

In addition, website 1101 can also include transmitter 1205 and antenna 1206 etc., processor 1201 controls website 1101 Operation, processor 1201 can also be known as central processing unit（Central Processing Unit, CPU）.Memory 1202 may include read-only memory and random access memory, and provide instruction and data to processor 1201.Memory 1202 a part of can also include nonvolatile RAM（NVRAM）.In specific application, receiver 1203 It may be coupled to antenna 1206 with transmitter 1205.The various components of website 1101 are coupled by bus system 1204, Wherein bus system 1204 can also include power bus, controlling bus and status signal bus in addition in addition to including data/address bus Deng.But for the sake of clear explanation, various buses are all designated as bus system 1204 in figure.

The method that the embodiments of the present invention disclose can be applied in processor 1201, or real by processor 1201 It is existing.Processor 1201 may be a kind of IC chip, the processing capacity with signal.During realization, the above method Each step can be completed by the instruction of the integrated logic circuit of the hardware in processor 1201 or software form.Above-mentioned Processor 1201 can be general processor, digital signal processor（DSP）, application-specific integrated circuit（ASIC）, it is ready-made programmable Gate array（FPGA）Either other programmable logic device, discrete gate or transistor logic, discrete hardware components.It can be with Realize or execute disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be micro- place It can also be any conventional processor etc. to manage device or the processor.The step of method in conjunction with disclosed in the embodiment of the present invention Hardware decoding processor can be embodied directly in and execute completion, or in decoding processor hardware and software module combination hold Row is completed.Software module can be located at random access memory, flash memory, read-only memory, programmable read only memory or electrically erasable In the storage medium for writing this fields such as programmable storage, register maturation.The storage medium is located at memory 1202, processor 1201 read the information in memory 1202, in conjunction with the step of its hardware completion above method.

Optionally, as one embodiment, processor 1201 measures the reception power for receiving calibration of power frame, and according to connecing Receive power and currently transmitted power calculation to access point path loss；Target, which is calculated, according to target received power and path loss sends work( Rate；Calculate uplink transmission power according to target transmission power and transmission bandwidth, wherein transmission bandwidth include local transmission bandwidth and The transmission bandwidth of access point.

Optionally, as one embodiment, transmitter 1205 sends current packet parameters to access point, makes access point root The website of grouping information setting access channel is generated according to packet parameters, and to each grouping and setting target received power, packet parameters Include the distance or path loss to access point；Receiver 1203 receives the grouping information of access point transmission so that processor 1201 are grouped according to grouping information, grouping information include each group of website for including the packet number for identifying, each organizing and Corresponding target received power；So that after receiving the calibration of power frame that access point is sent, according to the mesh of calibration of power frame carrying Tag splice receives the grouping that power selection is currently accessed, so that the grouping being currently accessed connects according to the target that calibration of power frame carries Receive power and currently transmitted power adjustment uplink transmission power.

Optionally, as one embodiment, memory 1202, which is used to store, makes processor 1201 executes to operate below Instruction：When packet parameters change, corresponding packet number is found according to the packet parameters after variation.Transmitter 1205 is used In sending grouping update claim frame to access point, grouping updates the packet number that claim frame includes new；Receiver 1203, for receiving The grouping that access point is sent adjusts frame, and grouping adjusts the packet number that frame includes new.

Optionally, as one embodiment, transmitter 1205 is used to send compatible ask to access point using calibration power Transmission frame is sought, so that access point returns to compatible channel idle according to request to send frame can send frame, request to send frame includes Network allocation vector；Receiver 1203, the channel idle for receiving access point return can send frame, to ensure in network point The transmitting uplink data of a certain grouping in time with vector instruction, it includes network allocation vector that channel idle, which can send frame,.

Please refer to Fig.1 the another logical construction schematic diagram that 2, Figure 12 is a kind of access point provided in an embodiment of the present invention.Figure 12 access point 1102 includes processor 1301, memory 1302, transmitter 1305 and receiver 1303.Processor 1301 is deposited Reservoir 1302, transmitter 1305 and receiver 1303 are connected by bus system 1304.

Transmitter 1305 calibrates frame for the website transmission power into WLAN, so that website is according to the calibration of power The target received power and currently transmitted power adjustment uplink transmission power that frame carries, to make access point receiving station send The difference of the practical reception power of row data is in default range；

The upstream data that receiver 1303 is sent for receiving station according to the uplink transmission power after adjustment.

In addition, access point 1102 can also include antenna 1306, processor 1301 controls the operation of access point 1102, processing Device 1301 can also be known as central processing unit（Central Processing Unit, CPU）.Memory 1302 may include Read-only memory and random access memory, and provide instruction and data to processor 1301.A part for memory 1302 is also It may include nonvolatile RAM（NVRAM）.In specific application, receiver 1303 and transmitter 1305 can To be coupled to antenna 1306.The various components of access point 1102 are coupled by bus system 1304, wherein bus system 1304 in addition to including data/address bus, can also include power bus, controlling bus and status signal bus in addition etc..But in order to clear For the sake of Chu's explanation, various buses are all designated as bus system 1304 in figure.

The method that the embodiments of the present invention disclose can be applied in processor 1301, or real by processor 1301 It is existing.Processor 1301 may be a kind of IC chip, the processing capacity with signal.During realization, the above method Each step can be completed by the instruction of the integrated logic circuit of the hardware in processor 1301 or software form.Above-mentioned Processor 1301 can be general processor, digital signal processor（DSP）, application-specific integrated circuit（ASIC）, it is ready-made programmable Gate array（FPGA）Either other programmable logic device, discrete gate or transistor logic, discrete hardware components.It can be with Realize or execute disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be micro- place It can also be any conventional processor etc. to manage device or the processor.The step of method in conjunction with disclosed in the embodiment of the present invention Hardware decoding processor can be embodied directly in and execute completion, or in decoding processor hardware and software module combination hold Row is completed.Software module can be located at random access memory, flash memory, read-only memory, programmable read only memory or electrically erasable In the storage medium for writing this fields such as programmable storage, register maturation.The storage medium is located at memory 1302, processor 1301 read the information in memory 1302, in conjunction with the step of its hardware completion above method.

Optionally, as one embodiment, memory 1302, which is used to store, makes processor 1301 executes to operate below Instruction：Multiple target received powers are set, and target received power is divided into multiple ranks；Transmitter 1305 is used to send out to website The calibration of power frame that power is received comprising different target is sent, so as to be sent in the calibration of power frame comprising some target received power Later, before next calibration of power frame comprising another target received power is sent, uplink transmission power is less than website most The big website energy contention access channel for allowing transmission power.

Optionally, as one embodiment, receiver 1303 receives the packet parameters that each website is sent, and packet parameters include This website arrives the distance or path loss of access point；Each website is grouped according to distance or path loss, setting only has one every time Group website accesses channel, and to each grouping and setting target received power；Calibration of power frame further includes packet number, wherein packet number with Target received power corresponds.

Optionally, as one embodiment, memory 1302, which is used to store, makes processor 1301 executes to operate below Instruction：When there is new site to be associated with this access point, new site is grouped according to the packet parameters of new site；Transmitter 1305 to new site transmission power for calibrating frame.

Optionally, as one embodiment, memory 1302, which is used to store, makes processor 1301 executes to operate below Instruction：For when detecting that having the packet parameters of website to change in this WLAN needs replacing grouping, change station The grouping of point, transmitter 1305 send grouping adjustment frame to website, are grouped the packet number that adjustment frame includes new.

Optionally, as one embodiment, receiver 1303 is used for the request to send frame that receiving station is sent, and request is sent Frame includes network allocation vector；

Transmitter 1303 is used to that according to the request to send frame Return Channel free time frame can be sent, and is sweared with ensureing to distribute in network The transmitting uplink data of a certain grouping in the time of instruction is measured, it includes network allocation vector that channel idle, which can send frame,.It please join Figure 13 is read, Figure 13 is a kind of logical construction schematic diagram of wireless lan communication system provided in an embodiment of the present invention.Such as Figure 13 Shown, which includes：

Website 1101, the calibration of power frame for receiving access point transmission, the calibration of power frame includes intended recipient work( Rate and currently transmitted power；According to the target received power and the currently transmitted power adjustment uplink transmission power, so that Reception power of the described access point in different sub-carrier or subchannel is in preset difference range；

Access point 1102 calibrates frame, the calibration of power frame packet for each website transmission power into WLAN Target received power and currently transmitted power are included, so that each website is according to the target received power and the currently transmitted power Adjust uplink transmission power；Receive the upstream data that each website is sent according to the uplink transmission power after adjustment.

Further, the step of website 1101 is according to target received power and currently transmitted power adjustment uplink transmission power Specifically：

The reception power that this equipment receives calibration of power frame is measured, and according to the reception power and currently transmitted power calculation This equipment arrives the path loss of access point；

The target transmission power of this equipment is calculated according to target received power and path loss；

According to target transmission power and it is pre-stored in the transmission bandwidth of local access point and the transmission bandwidth of this equipment Calculate uplink transmission power.

Further, calibration of power frame further includes power dynamics range instructions field；Website is according to calibration of power frame After adjusting uplink transmission power, it is additionally operable to carry out uplink transmission power according to the power dynamics range instructions field micro- It adjusts, so that this equipment carries out upstream data transmission using the uplink transmission power after fine tuning.

Further, website 1101 is additionally operable to send current packet parameters to access point 1102, wherein packet parameters packet Include distance or path loss that this equipment arrives access point；The grouping information that access point returns is received, wherein grouping information includes each The corresponding packet number of group and target received power.

Access point 1102 is additionally operable to be grouped each website 1101 according to packet parameters, and setting only has one group of website every time Channel is accessed, and to each grouping and setting target received power.

Further, website 1101 is additionally operable to when the packet parameters of this equipment change, according to the grouping after variation Parameter finds corresponding packet number；Grouping update claim frame is sent to access point 1102, wherein grouping update claim frame includes New packet number；It receives the grouping that access point 1102 is sent and adjusts frame, wherein grouping adjustment frame includes new packet number.

Access point 1102, which is additionally operable to have the packet parameters of website 1101 to change in this WLAN, to be needed replacing When grouping, the grouping of the website 1101 is replaced, and grouping adjustment frame is sent to the website.

Further, website 1101 is additionally operable to when the packet parameters of this equipment change, and is sent to access point 1102 New parameter；It receives the grouping that access point 1102 is sent and adjusts frame, and according to grouping adjustment frame update grouping.

Access point 1102, which is additionally operable to have the packet parameters of website to change in this WLAN, needs replacing grouping When, the grouping of website is replaced, and grouping adjustment frame is sent to website, wherein grouping adjustment frame includes new packet number.

Further, it is additionally operable to be arranged before each website transmission power calibration frame of the access point 1102 into WLAN Multiple target received powers, and target received power is divided into several ranks.

The step of each website transmission power of the access point 1102 into WLAN calibrates frame is specific：

To each website（It optionally, can be according to each website of the preset sequence into WLAN）It includes different mesh to send Tag splice receives the calibration of power frame of power, so that after the calibration of power frame comprising some target received power is sent, it is next Including before the calibration of power frame of another target received power is sent, uplink transmission power is less than the maximum allowable transmission work(of website The website energy contention access channel of rate.

Further, multiple target received powers are arranged in access point, and the target received power is divided into several ranks After be additionally operable to the broadcast station transmission power lower limit in this WLAN, to be arranged refusal uplink transmission power be less than The website of the transmission power lower limit carries out channel access.

Further, it is also used before the step of each website transmission power of the access point 1102 into WLAN calibrates frame In the packet parameters for receiving each website transmission, wherein packet parameters include distance or path loss of the website to access point；According to this Distance or path loss determine the grouping of website, and only one group of website accesses channel every time for setting, and is connect to each grouping and setting target Receive power；Wherein, calibration of power frame further includes packet number, and wherein packet number is corresponded with target received power.

Further, access point 1102 receive each website according to after adjustment uplink transmission power send upstream data it After be additionally operable to when there is new site to be associated with this access point, the new site is grouped according to the packet parameters of new site；And Frame is calibrated to the new site transmission power.

Further, website is also used for calibration power and sends compatible RTS frames to access point, and wherein RTS frames include Network allocation vector；The CTS frames that access point returns are received, wherein CTS frames include network allocation vector.

Access point is additionally operable to the RTS frames of receiving station transmission；CTS frames are returned to further according to the RTS frames, to ensure in network point The transmitting uplink data of a certain grouping in time with vector instruction, wherein CTS frames include network allocation vector.

Further, access point is also used for calibration power and sends compatible RTS frames to website, and wherein RTS frames include Network allocation vector；The CTS frames that access point returns are received, wherein CTS frames include network allocation vector.

Website is additionally operable to receive the RTS frames that access point is sent；CTS frames are returned to further according to the RTS frames, to ensure in network point The downlink data transmission of a certain grouping in time with vector instruction, wherein CTS frames include network allocation vector.

Further, access point is additionally operable to the website into this WLAN and broadcasts an access group instruction frame for referring to The grouping of channel can currently be accessed by showing, wherein access group instruction frame includes packet number.

Can be that the scene of OFDMA connects it should be noted that in wireless lan communication system provided in this embodiment Enter, can also be uplink MU-MIMO scenes and the common power control scene of other non-OFDMA modes, do not limit herein System.

Also, in the alternative embodiment of the present invention, wireless lan communication system of the invention may also comprise Fig. 4 or figure The access point described in website and Fig. 7 or Fig. 8 described in 5.

In several embodiments provided herein, it should be understood that disclosed system, device and method can To realize by another way.For example, device embodiments described above are only schematical, for example, the mould The division of block or unit, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, for example (,) it is multiple Unit or component can be combined or can be integrated into another system, or some features can be ignored or not executed.It is another Point, shown or discussed mutual coupling, direct-coupling or communication connection can be by some interfaces, device or The INDIRECT COUPLING of unit or communication connection can be electrical, machinery or other forms.

The unit illustrated as separating component may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple In network element.Some or all of unit therein can be selected according to the actual needs to realize present embodiment scheme Purpose.

In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, also may be used It, can also be during two or more units be integrated in one unit to be that each unit physically exists alone.It is above-mentioned integrated The form that hardware had both may be used in unit is realized, can also be realized in the form of SFU software functional unit.

If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product When, it can be stored in a computer read/write memory medium.Based on this understanding, the technical solution of the application is substantially The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words It embodies, which is stored in a storage medium, including some instructions are used so that a computer Equipment（Can be personal computer, server or the network equipment etc.）Or processor（processor）It is each to execute the application The all or part of step of embodiment the method.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory （ROM, Read-Only Memory）, random access memory（RAM, Random Access Memory）, magnetic disc or CD Etc. the various media that can store program code.

Claims

1. a kind of uplink transmission power calibration method, which is characterized in that include the following steps：

Current packet parameters are sent to access point, so that described access point is generated grouping information setting according to the packet parameters and are connect Enter the website of channel, and to each grouping and setting target received power, the packet parameters include to described access point distance or Person's path loss；

The grouping information of described access point transmission is received to be grouped according to the grouping information, the grouping information The packet number for identifying, each organizing for the website for including including each group and the corresponding target received power；So that receiving After the calibration of power frame that access point is sent, the target received power selection carried according to the calibration of power frame is currently accessed Grouping so that target received power and currently transmitted work(that the grouping being currently accessed is carried according to the calibration of power frame Rate adjusts uplink transmission power；

The calibration of power frame that described access point is sent is received, the calibration of power frame includes the target received power and described works as Preceding transmission power；

According to the target received power and the currently transmitted power adjustment uplink transmission power, so that described access point is not With the reception power on subcarrier or subchannel in preset difference range.

2. according to the method described in claim 1, it is characterized in that, described according to target received power and currently transmitted power tune Whole uplink transmission power includes：

The reception power for receiving the calibration of power frame is measured, and according to the reception power and the currently transmitted power calculation To the path loss of described access point；

Target transmission power is calculated according to the target received power and the path loss；

The uplink transmission power is calculated according to the target transmission power and transmission bandwidth, wherein the transmission bandwidth includes this The transmission bandwidth of ground transmission bandwidth and described access point.

3. according to the method described in claim 1, it is characterized in that：

When the packet parameters change, corresponding packet number is found according to the packet parameters after variation；

Grouping update claim frame is sent to access point, the grouping updates the packet number that claim frame includes new；

It receives the grouping that described access point is sent and adjusts frame, the grouping adjusts the packet number that frame includes new.

4. method according to any one of claims 1 to 3, which is characterized in that the power school for receiving access point and sending Further include after the step of quasi- frame：

Compatible request to send frame is sent to described access point using calibration power, so that described access point is sent out according to the request Frame can be sent by sending frame to return to compatible channel idle, and the request to send frame includes network allocation vector；

Frame can be sent by receiving the channel idle that described access point returns, to ensure the time indicated in the network allocation vector The transmitting uplink data of interior a certain grouping, it includes the network allocation vector that the channel idle, which can send frame,.

5. a kind of uplink transmission power calibration method, which is characterized in that include the following steps：

The packet parameters that receiving station is sent, the packet parameters include distance or path loss of the website to access point；

The grouping of the website is determined according to the distance or the path loss, only one group of website accesses channel every time for setting, And to each grouping and setting target received power；

Calibration of power frame further includes packet number, and wherein packet number is corresponded with target received power；

The website into WLAN sends the calibration of power frame, so that the website is according to the calibration of power frame The target received power and currently transmitted power adjustment uplink transmission power carried, to make described in described access point reception Website sends the difference of the practical reception power of upstream data in default range；

Receive the upstream data that the website is sent according to the uplink transmission power after adjustment.

6. according to the method described in claim 5, it is characterized in that, the website transmission power into WLAN Further include before the step of calibrating frame：

Multiple target received powers are set, and the target received power is divided into multiple ranks；

The website transmission power into WLAN calibrates frame：

The calibration of power frame that power is received comprising different target is sent to the website, so that including some target received power Calibration of power frame send after, it is next comprising another target received power the calibration of power frame transmission before, it is described on Row transmission power is less than the website energy contention access channel of the maximum allowable transmission power of website.

7. according to the method described in claim 5, it is characterized in that, described receive the website according to the uplink transmission after adjustment Further include after the step of upstream data that power is sent：

When there is new site to be associated with this access point, the new site is grouped according to the packet parameters of the new site；

Frame is calibrated to the new site transmission power.

8. the method according to the description of claim 7 is characterized in that described receive the website according to the uplink transmission after adjustment Further include after the step of upstream data that power is sent：

When detecting that there are the packet parameters of website to change in this WLAN needs replacing grouping, the website is replaced Grouping, and send grouping adjustment frame to the website, the grouping adjustment frame includes new packet number.

9. according to the method described in claim 8, it is characterized in that, the website transmission power into WLAN Further include after the step of calibrating frame：

The request to send frame that the website is sent is received, the request to send frame includes network allocation vector；

Frame can be sent according to the request to send frame Return Channel free time, to ensure when the network allocation vector indicates The transmitting uplink data of interior a certain grouping, it includes the network allocation vector that the channel idle, which can send frame,.

10. a kind of website, which is characterized in that including：

Packet parameters sending module makes described access point according to the grouping for sending current packet parameters to access point Parameter generates the website of grouping information setting access channel, and to each grouping and setting target received power, the packet parameters packet Include the distance or path loss of described access point；

Grouping information receiving module, for receiving the grouping information of described access point transmission so that uplink transmission power Computing unit is grouped according to the grouping information, and the grouping information includes identifying, each for each group of website for including The packet number of group and corresponding target received power；So that after receiving the calibration of power frame that described access point is sent, it is described The target received power that uplink transmission power adjustment module is carried according to the calibration of power frame selects the grouping being currently accessed, from And make on target received power and currently transmitted power adjustment that the grouping that is currently accessed carries according to the calibration of power frame Row transmission power；

Calibration of power frame receiving module, the calibration of power frame for receiving described access point transmission, the calibration of power frame include The target received power and the currently transmitted power；

Uplink transmission power adjusts module, for being sent out according to the target received power and the currently transmitted power adjustment uplink Power is sent, so that reception power of the described access point in different sub-carrier or subchannel is in preset difference range.

11. website according to claim 10, which is characterized in that the calibration of power frame receiving module includes：

Measuring unit for measuring the reception power for receiving the calibration of power frame, and according to the reception power and described is worked as Preceding transmission power calculates the path loss to described access point；

Target transmission power calculation unit, for calculating target transmission power according to the target received power and the path loss；

Uplink transmission power computing unit sends work(for calculating the uplink according to the target transmission power and transmission bandwidth Rate, wherein the transmission bandwidth includes the transmission bandwidth of local transmission bandwidth and described access point.

12. website according to claim 10, which is characterized in that the website further includes：

Packet lookup module finds corresponding point when the packet parameters change according to the packet parameters after variation Group number；

More new frame sending module, for sending grouping update claim frame to access point, the grouping update claim frame includes new Packet number；

Grouping update acknowledgement frame receiving module, the grouping for receiving described access point transmission adjust frame, and the grouping adjusts frame Including new packet number.

13. website according to claim 10, which is characterized in that the website further includes：

Request to send frame sending module, for sending compatible request to send frame to access point using calibration power, so that described Access point returns to compatible channel idle according to the request to send frame can send frame, and the request to send frame includes network point With vector；

Channel idle can send frame receiving module, and the channel idle for receiving described access point return can send frame, with Ensure that the transmitting uplink data of a certain grouping within the time that the network allocation vector indicates, the channel idle can be sent Frame includes the network allocation vector.

14. a kind of access point, which is characterized in that including：

Packet parameters receiving module for the packet parameters that receiving station is sent, and is exported to grouping module, the packet parameters The distance or path loss of described access point are arrived including this website；

Grouping module, for being grouped to the website according to the distance or the path loss, only one group every time of setting Website accesses channel, and to each grouping and setting target received power；

The calibration of power frame further includes packet number, and wherein packet number is corresponded with target received power；

Calibration of power frame sending module calibrates frame, so that the station for the website transmission power into WLAN Put the target received power carried according to the calibration of power frame and currently transmitted power adjustment uplink transmission power；

Upstream data receiving module, for receive the website according to after adjustment uplink transmission power send upstream data from And make described access point receive the website send upstream data practical reception power difference in default range.

15. access point according to claim 14, which is characterized in that described access point further includes：

Setup module is divided into multiple ranks for multiple target received powers to be arranged, and by the target received power；

The calibration of power frame sending module, for sending the calibration of power for receiving power comprising different target to the website Frame, so that after the calibration of power frame comprising some target received power is sent, next includes another intended recipient work( Before the calibration of power frame of rate is sent, the uplink transmission power can be competed less than the website of the maximum allowable transmission power of website and be connect Enter channel.

16. access point according to claim 14, which is characterized in that described access point further includes：

Grouping module, for when there is new site to be associated with this access point, according to the packet parameters of the new site to described new Website is grouped；

Calibration of power frame sending module, for calibrating frame to the new site transmission power.

17. access point according to claim 14, which is characterized in that described access point further includes：

Module is replaced in grouping, for when detecting that having the packet parameters of website to change in this WLAN needs replacing point When group, the grouping of the website is replaced, and grouping adjustment frame, the grouping for being grouped adjustment frame and including new are sent to the website Number.

18. access point according to claim 14, which is characterized in that described access point further includes：

Request to send frame receiving module, the request to send frame sent for receiving the website, the request to send frame includes net Network allocation vector；

Channel idle can send frame sending module, for frame can be sent according to the request to send frame Return Channel free time, To ensure that the transmitting uplink data of a certain grouping within the time that the network allocation vector indicates, the channel idle can be sent out It includes the network allocation vector to send frame.

19. a kind of wireless lan communication system, which is characterized in that including any one of claim 10 to 13 website and Access point described in any one of claim 14 to 18.