CN104284408A

CN104284408A - Calibration method for uplink sending power and associated equipment and system thereof

Info

Publication number: CN104284408A
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: 2015-01-14
Anticipated expiration: 2033-07-02
Also published as: CN104284408B; WO2015000304A1

Abstract

The invention discloses a calibration method for uplink sending power and associated equipment and system of the calibration method. The calibration method for the uplink sending power comprises the steps of receiving a power calibration frame sent by an access point, wherein the power calibration frame comprises a target receiving power and a current sending power; adjusting the uplink sending power according to the target receiving power and the current sending power, so that the receiving power, on different subcarriers or sub channels, of the access point is in a preset difference value range. According to the calibration method for the uplink sending power, the problem that it is difficult to normally receive all the uplink data when the difference between the received uplink sending powers of different stations is large in an uplink OFDMA communication process can be solved, and the problem that inter-user interference is large when the difference between the received uplink sending powers of different stations in an uplink MU-MIMO system is quite large can be solved.

Description

Uplink transmission power calibration steps and relevant device thereof and system

Technical field

The application relates to network communication field, particularly relates to uplink transmission power calibration steps and relevant device thereof and system.

Background technology

OFDM (Orthogonal Frequency-division Multiple Access, OFDMA) be orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing, OFDM) evolution, transmission bandwidth is divided into a series of subcarrier collection of orthogonal non-overlapping copies by OFDMA connecting system, different subcarrier collection is distributed to different users and realizes multiple access, by total resources, such as time, bandwidth, frequency is split, realize multi-user diversity gain, improve throughput of system.The application of OFDMA technology simultaneously also may reduce the collision probability of channel competition, reduces the time delay of packet.Adopt OFDMA technology on the uplink channel, access point can receive the packet from multiple website simultaneously.In this case, in order to correctly receive the upstream data of multiple website in OFDMA symbol, access point needs to arrange a suitable automatic gain control value makes all site works in OFDMA symbol in the range of linearity of amplifier, and it is close that this just requires that all websites in OFDMA symbol arrive the power of access points.

In order to avoid introducing the problem of new concealed nodes, in existing upgoing O FDMA communication, do not carry out uplink power control, namely access point and node all use fixed transmission power, adopt this mechanism, in multi-upstream access process, the power that the channel access information that far and near different user sends arrives access point is different, greatly can reduce the success rate of access, such as:

A near-end user and remote subscriber access in same sub-band, and the near-end user signal power that access point receives is much larger than remote subscriber, and due to sink effect, near-end user successfully accesses, remote subscriber access failure;

B near-end user and remote subscriber access in same sub-band, and the near-end user signal power that receives of access point and remote subscriber signal power are more or less the same, near-end user and remote subscriber conflict, access failure;

C near-end user and remote subscriber access at different sub-band, and access point arranges automatic growth control according to the total signal power received, and remote subscriber signal amplifies not, possible access failure.

In upgoing O FDMA communication process, if the received power difference on different sub carrier/subchannel is larger, the failure of lower-powered Signal reception may be caused, and, under this mechanism, the website access channel difficulty that distance access point is far away, and for the website of close together, transmitted power difficulty is greater than the transmitted power of actual needs, power saves poor-performing, and easily extra interference is caused to other equipment, so when the signal power difference receiving the transmission of different website in upgoing O FDMA communication process is larger, access point is difficult to normal reception and is provided with user data.

Summary of the invention

The embodiment of the present application provides a kind of uplink transmission power calibration steps, equipment and system, wish to solve the uplink transmission power difference receiving different website in upgoing O FDMA communication process larger time, be difficult to the problem normally receiving all upstream datas, and solve the uplink transmission power difference receiving different website in uplink multi-users input and output (MU-MIMO) system larger time, the larger problem of inter-user interference.

First aspect provides a kind of uplink transmission power calibration steps, and comprise the steps: the calibration of power frame receiving access point transmission, calibration of power frame comprises target received power and current transmitted power; According to target received power and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset.

In the first possible implementation of first aspect, comprise according to target received power and current transmitted power adjustment uplink transmission power: the received power measuring received power calibration frame, and calculate the path loss of access point according to received power and current transmitted power; Target transmit power is calculated according to target received power and path loss; According to target transmit power and transmission bandwidth calculation uplink transmission power, wherein send bandwidth and comprise the local transmission bandwidth sending bandwidth sum access point.

In conjunction with any one in the first possible implementation of first aspect, first aspect, in the implementation that the second is possible, also comprise before receiving the step of the calibration of power frame that access point sends: send current packet parameters to access point, access point is made to generate according to packet parameters the website that grouping information arranges access channel, and to each grouping and setting target received power, packet parameters is included in distance or the path loss of access point; Receive the grouping information of access point transmission thus website is divided into groups according to grouping information, grouping information comprises the target received power of the mark of the website that each group comprises, the packet number of each group and correspondence; After accepting the calibration of power frame of access point transmission to make website, the target received power carried according to calibration of power frame selects the grouping of current access, thus the target received power that the grouping of current access is carried according to calibration of power frame and current transmitted power adjustment uplink transmission power.

In conjunction with the implementation that the second of first aspect is possible, in the implementation that the third is possible, when packet parameters changes, find corresponding packet number according to the packet parameters after change; Send grouping update request frame to access point, grouping update request frame comprises new packet number; Receive the grouping adjustment frame that access point sends, grouping adjustment frame comprises new packet number.

The implementation possible in conjunction with the second of first aspect or the third possible implementation, in the 5th kind of possible implementation, also comprise after receiving the step of the calibration of power frame that access point sends: use calibration power to send compatible request transmission frame to access point, can transmission frame to make access point return compatible channel idle according to request transmission frame, request transmission frame comprises network allocation vector; Receiving the channel idle that returns of access point can transmission frame, and to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, channel idle can comprise network allocation vector by transmission frame.

Second aspect provides a kind of uplink transmission power calibration steps, comprise the steps: to the website transmitted power calibration frame in WLAN (wireless local area network), the target received power carried according to calibration of power frame to make website and current transmitted power adjustment uplink transmission power, thus make access point receiving station send the difference of the actual received power of upstream data in the scope preset; The upstream data that receiving station sends according to the uplink transmission power after adjustment.

In the first possible implementation of second aspect, also comprised calibrate the step of frame to the website transmitted power in WLAN (wireless local area network) before: multiple target received power is set, and target received power is divided into multiple rank; Comprise to the website transmitted power calibration frame in WLAN (wireless local area network): send the calibration of power frame comprising different target received power to website, to make after the calibration of power frame comprising certain target received power sends, before the calibration of power frame that the next one comprises another target received power sends, uplink transmission power is less than the website energy contention access channel of the maximum permission transmitted power of website.

In conjunction with the first possible implementation of second aspect, in the implementation that the second is possible, step from access point to the website transmitted power calibration frame in WLAN (wireless local area network) before also comprise: the packet parameters that receiving station sends, packet parameters comprises website to the distance of access point or path loss; According to distance or the grouping of path loss determination website, arrange and only have one group of website access channel at every turn, and to each grouping and setting target received power; Calibration of power frame also comprises packet number, wherein packet number and target received power one_to_one corresponding.

In conjunction with the implementation that the second of second aspect is possible, in the implementation that the third is possible, also comprise after the step of the upstream data that receiving station sends according to the uplink transmission power after adjustment: when there being new site to be associated with this access point, the packet parameters according to new site is divided into groups to new site; To new site transmitted power calibration frame.

In conjunction with the third possible implementation of second aspect, in the 4th kind of possible implementation, receiving station according to adjustment after uplink transmission power send upstream data step after also comprise: when detect in this WLAN (wireless local area network) have the packet parameters of website change needs change divide into groups time, change the grouping of website, and sending grouping adjustment frame to website, grouping adjustment frame comprises new packet number.

In conjunction with the 4th kind of possible implementation of second aspect, in the 5th kind of possible implementation, also comprise after the website transmitted power in WLAN (wireless local area network) calibrates the step of frame: the request transmission frame that receiving station sends, request transmission frame comprises network allocation vector; Can transmission frame according to the request transmission frame Return Channel free time, to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, channel idle can comprise network allocation vector by transmission frame.

The third aspect provides a kind of website, comprising: calibration of power frame receiver module, and for receiving the calibration of power frame that access point sends, calibration of power frame comprises target received power and current transmitted power; Uplink transmission power adjusting module, for according to target received power and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset.

In the first possible implementation of the third aspect, calibration of power frame receiver module comprises: measuring unit, for measuring the received power of received power calibration frame, and calculates the path loss of access point according to received power and current transmitted power; Target transmit power computing unit, for calculating target transmit power according to target received power and path loss; Uplink transmission power computing unit, for according to target transmit power and transmission bandwidth calculation uplink transmission power, wherein sends bandwidth and comprises the local transmission bandwidth sending bandwidth sum access point.

In conjunction with the first possible implementation of the third aspect or the third aspect, in the implementation that the second is possible, website also comprises: packet parameters sending module, for sending current packet parameters to access point, access point is made to generate according to packet parameters the website that grouping information arranges access channel, and to each grouping and setting target received power, packet parameters is included in distance or the path loss of access point; Grouping information receiver module, for receiving the grouping information of access point transmission thus making website divide into groups according to grouping information, grouping information comprises the target received power of the mark of the website that each group comprises, the packet number of each group and correspondence; After accepting the calibration of power frame of access point transmission to make website, the target received power carried according to calibration of power frame selects the grouping of current access, thus the target received power that the grouping of current access is carried according to calibration of power frame and current transmitted power adjustment uplink transmission power.

In conjunction with the implementation that the second of the third aspect is possible, in the implementation that the third is possible, website also comprises: packet lookup module, when packet parameters changes, finds corresponding packet number according to the packet parameters after change; Upgrade frame sending module, for sending grouping update request frame to access point, grouping update request frame comprises new packet number; Grouping upgrades acknowledgement frame receiver module, and for receiving the grouping adjustment frame that access point sends, grouping adjustment frame comprises new packet number.

The implementation possible in conjunction with the second of the third aspect or the third possibility implementation, in the 4th kind of possible implementation, website also comprises: request transmission frame sending module, compatible request transmission frame is sent to access point for using calibration power, can transmission frame to make access point return compatible channel idle according to request transmission frame, request transmission frame comprises network allocation vector; Channel idle can transmission frame receiver module, can transmission frame for receiving channel idle that access point returns, and to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, channel idle can comprise network allocation vector by transmission frame.

Fourth aspect provides a kind of access point, comprise: calibration of power frame sending module, for calibrating frame to the website transmitted power in WLAN (wireless local area network), the target received power carried according to calibration of power frame to make website and current transmitted power adjustment uplink transmission power, thus make access point receiving station send the difference of the actual received power of upstream data in the scope preset; Upstream data receiver module, for the upstream data that receiving station sends according to the uplink transmission power after adjustment.

In the first possible implementation of fourth aspect, access point also comprises: arrange module, for arranging multiple target received power, and target received power is divided into multiple rank; Calibration of power frame sending module, for sending the calibration of power frame comprising different target received power to website, to make after the calibration of power frame comprising certain target received power sends, before the calibration of power frame that the next one comprises another target received power sends, uplink transmission power is less than the website energy contention access channel of the maximum permission transmitted power of website.

In the implementation that the second of fourth aspect is possible, access point also comprises: packet parameters receiver module, for the packet parameters that receiving station sends, and exports grouping module to, and packet parameters comprises distance or the path loss that this website arrives access point; Grouping module, for dividing into groups to website according to distance or path loss, arranging and only having one group of website access channel at every turn, and to each grouping and setting target received power; Calibration of power frame also comprises packet number, wherein packet number and target received power one_to_one corresponding.

In the third possible implementation of fourth aspect, access point also comprises: grouping module, and for when there being new site to be associated with this access point, the packet parameters according to new site is divided into groups to new site; Calibration of power frame sending module, for calibrating frame to new site transmitted power.

In the 4th kind of possible implementation of fourth aspect, access point also comprises: module is changed in grouping, for when detecting in this WLAN (wireless local area network) that having the packet parameters of website to change needs to change grouping, change the grouping of website, and sending grouping adjustment frame to website, grouping adjustment frame comprises new packet number.

In the 5th kind of possible implementation of fourth aspect, access point also comprises: request transmission frame receiver module, and for the request transmission frame that receiving station sends, request transmission frame comprises network allocation vector; Channel idle can transmission frame sending module, and for can transmission frame according to the request transmission frame Return Channel free time, to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, channel idle can comprise network allocation vector by transmission frame.

5th aspect provides a kind of wireless lan communication system, comprises the access point described in any one in first to the 5th kind of possible implementation of the website described in any one in the third aspect, first to fourth kind of the third aspect possible implementation and fourth aspect, fourth aspect.

Known by above-mentioned analysis, the calibration of power frame that in the present invention, website sends by receiving access point, and according to the target received power carried in this calibration of power frame and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset; Thus the uplink transmission power difference of each website in the WLAN (wireless local area network) that access point is received is less, thus upstream data can be received better.

Accompanying drawing explanation

Fig. 1 is the flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides;

Fig. 2 is another flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides;

Fig. 3 is the concealed nodes schematic diagram that the embodiment of the present invention provides;

Fig. 4 is another flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides;

Fig. 5 is another flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides;

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

Fig. 7 is the logical construction schematic diagram of a kind of website that the embodiment of the present invention provides;

Fig. 8 is another logical construction schematic diagram of a kind of website that the embodiment of the present invention provides;

Fig. 9 is the logical construction schematic diagram of a kind of access point that the embodiment of the present invention provides;

Figure 10 is another logical construction schematic diagram of a kind of access point that the embodiment of the present invention provides;

Figure 11 is the another logical construction schematic diagram of a kind of website that the embodiment of the present invention provides;

Figure 12 is the another logical construction schematic diagram of a kind of access point that the embodiment of the present invention provides;

Figure 13 is the logical construction schematic diagram of a kind of wireless lan communication system that the embodiment of the present invention provides.

Embodiment

The embodiment of the present invention provides uplink transmission power calibration steps, corresponding equipment and Wireless Local Area Communication Networks system, the uplink transmission power of this website of calibration of power framing control that site STA can utilize access point AP to send, to make the received power of access point in different sub carrier or subchannel in the difference range preset; Thus the uplink transmission power difference of each website in the WLAN (wireless local area network) that access point is received is less, thus upstream data can be received better.Below be described in detail respectively.

Refer to Fig. 1, Fig. 1 is the flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides.It should be noted that in the present embodiment, be described using website as main body, as shown in Figure 1, the method can comprise the following steps.

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

First, access point is to each website transmitted power calibration frame in WLAN (wireless local area network), and access point can to the transmitted power calibration frame one by one of each website in WLAN (wireless local area network), and also broadcasting power can calibrate frame in a wireless local area network, the present invention does not limit; Wherein, this calibration of power frame comprises target received power and current transmitted power.

Website receives the calibration of power frame that access point sends.

102, according to target received power and described current transmitted power adjustment uplink transmission power.

After website receives the calibration of power frame of access point transmission, according to the target received power carried in this calibration of power frame and current transmitted power adjustment uplink transmission power, thus make the received power of access point in different sub carrier or subchannel in the difference range preset.

In the present embodiment, the calibration of power frame that website sends by receiving access point, and according to the target received power carried in this calibration of power frame and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset; Thus the uplink transmission power difference of each website in the WLAN (wireless local area network) making access point receive is less, reduces the interference between user, thus upstream data can be received better.

Refer to Fig. 2, Fig. 2 is another flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides.In the present embodiment, be described using website as main body, as shown in Figure 2, the method can comprise the following steps.

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

Access point is to each website transmitted power calibration frame in WLAN (wireless local area network), and access point can to the transmitted power calibration frame one by one of each website in WLAN (wireless local area network), and also broadcasting power can calibrate frame in a wireless local area network, the present invention does not limit; Wherein, this calibration of power frame comprises target received power and current transmitted power.

Website receives the calibration of power frame that access point sends.

202, measure the received power of this website received power calibration frame, and calculate the path loss of this website to access point according to received power and current transmitted power.

After website receives the calibration of power frame of access point transmission, measure the received power that local terminal receives this calibration of power frame, and calculate the path loss of this website to access point according to the current transmitted power of carrying in received power and calibration of power frame, concrete:

Path loss=current transmitted power-received power.

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

After calculating local terminal to the path loss of access point, website calculates according to target received power and path loss the target transmit power oneself wanted again, concrete:

Target transmit power=target received power+path loss.

204, according to target transmit power, the transmission bandwidth calculation uplink transmission power sending this website of bandwidth sum., wherein send bandwidth and comprise the local transmission bandwidth sending bandwidth sum access point.

Website based target transmitted power calculates uplink transmission power, and the transmission bandwidth of the transmission bandwidth sum access point of this website is known and is kept at this locality in advance, concrete:

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

205, the threshold value whether uplink transmission power is greater than this website and presets is judged.

The uplink transmission power that website calculates in step 204 likely can be greater than the threshold value that this website presets, if be greater than, this website just cannot carry out the transmission of upstream data with this uplink transmission power, this threshold value can be the transmission upper limit or the regulation power-limiting of this website, or other power preset; So, after calculating uplink transmission power, need to judge the threshold value whether uplink transmission power is greater than this website and presets, if uplink transmission power is greater than the threshold value that this website presets, then perform step 206, if row transmitted power is not more than the threshold value that this website presets, then perform step 207.

206, the threshold value using this website to preset carries out upstream data transmission as uplink transmission power.

If judge the threshold value that uplink transmission power is greater than this website and presets in step 205, then the threshold value using this website to preset carries out upstream data transmission as uplink transmission power.

207, uplink transmission power is used to send upstream data.

If judge the threshold value that uplink transmission power is not more than this website and presets in step 205, then the uplink transmission power using step 204 to calculate sends upstream data.

In practical application, under the scene that the coverage of base station sub-system is larger, the target transmit power calculated in step 203 for the nearer website of distance access point and distance access point website far away may difference larger, if ensure that the performance of near-end website reaches best, then the uplink transmission power of remote station may exceed the threshold value preset, such as, send the upper limit or regulation power-limiting; On the contrary, if ensure that the uplink transmission power of remote station is no more than the threshold value preset, then the performance of near-end website just may be very poor, this is because in order to the not super threshold value preset of the uplink transmission power ensureing remote station, then access point can only select a less target received power, thus also can only select lower modulation coding mode to near-end website.

So, need to manage to allow website to carry out fine setting to the uplink transmission power calculated and solve the problems referred to above.In practical operation, access point does not require that the uplink transmission power of all websites received is completely the same, allows the scope of a dynamic change, so, in the scope that website just can allow at access point, uplink transmission power is finely tuned.In another embodiment, calibration of power frame also comprises power dynamics scope instructions field, and website can be finely tuned uplink transmission power according to power dynamics scope instructions field.Wherein, power dynamics scope instructions field can indicate in calibration of power frame, also can separately within a beacon frame with an element instruction, and the present invention does not limit.

If judge the threshold value that uplink transmission power is not more than this website and presets in step 205, then get the value that described transmitted power dynamic range instructions field is added with target transmit power, minimum value after compared with between the threshold value preset with this website, carries out upstream data transmission as the uplink transmission power after fine setting.Certainly, in actual applications, website also can select a suitable power as uplink transmission power according to the needs of up modulation coding mode, and the present invention does not limit.

So, by allowing website, uplink transmission power is finely tuned, when ensureing that the uplink transmission power of the website that distance access point is far away does not surpass the threshold value preset, the nearer website of distance access point can be made can to use higher transmitted power and the modulation coding mode of Geng Gao, thus obtain better performance, such as there is better throughput.

In actual applications, if the target received power that access point is arranged in calibration of power frame is bigger than normal, then the transmitted power that distance access point website far away can be made to need is excessive, exceeds the maximum transmit power of permission, thus cannot successfully access; If arrange too small by target received power, then the website that distance access point is nearer can only use lower modulation coding mode, and throughput reduces, and cannot reach optimum performance.

In another embodiment, first website sends current packet parameters to access point before performing step 201, and wherein, packet parameters comprises distance or the path loss that this website arrives access point;

After access point receives packet parameters, divide into groups according to the website that this packet parameters is WLAN (wireless local area network), arrange and only have one group of website access channel at every turn, and to each grouping and setting target received power, again to all website transmitted power calibration frames in WLAN (wireless local area network), this calibration of power frame comprises target received power, current transmitted power and grouping information, and grouping information comprises site identity, packet number, wherein, site identity, packet number and target received power are corresponding.Certain grouping information also can send separately and not be included in calibration of power frame, and when sending separately, grouping information comprises the target received power of the mark of the website that this grouping comprises, packet number and correspondence.

Website receives the grouping information that access point returns, and this grouping information is kept at this locality, and grouping information comprises the mark of the website that each group comprises, the packet number of each group and corresponding target received power.Particularly, website receives the grouping information of access point transmission thus website is divided into groups according to grouping information, grouping information comprises the target received power of the mark of the website that each group comprises, the packet number of each group and correspondence, after accepting the calibration of power frame of access point transmission to make website, the target received power carried according to described calibration of power frame selects the grouping of current access, thus the target received power that the grouping of current access is carried according to calibration of power frame and current transmitted power adjustment uplink transmission power.

Further, when the packet parameters of this website changes, in grouping information, corresponding packet number is found according to the packet parameters after change, then grouping update request frame is sent to access point, make access point according to grouping update request frame for this website upgrades grouping, and return grouping adjustment frame, wherein, grouping update request frame comprises new packet number.

Website receives the grouping adjustment frame that access point sends, and wherein, grouping adjustment frame comprises new packet number.

Adjustment grouping can also be dominated by access point end, concrete:

When the packet parameters of website changes, first send new parameter by this website to access point, such as, when website detect local terminal to the path loss of access point occur larger change need to upgrade divide into groups time, report new path loss to access point; To make access point according to the new parameter received for this website upgrades grouping, concrete:

Preserve rule of classification in access point this locality, i.e. packet parameters and corresponding packet number, access point searches the packet number corresponding with this parameter according to new parameter, as new packet number.

After access point finds new packet number, send grouping adjustment frame to this website, wherein grouping adjustment frame comprises new packet number;

Website receives the grouping adjustment frame of access point transmission, upgrades grouping, and adjust uplink transmission power according to the target received power of the grouping correspondence after renewal according to this grouping adjustment frame.

In the aforementioned embodiment, access point controls website and adopts different uplink transmission powers to carry out the access of up channel and the transmission of upstream data, thus solve in upgoing O FDMA communication process, access point receive different website send signal power difference larger time, be difficult to the problem normally receiving the upstream data of all websites.

But, when the website transmitted power in WLAN (wireless local area network) is different, just may cause the problem of concealed nodes, namely when the uplink transmission power of a certain website is less, website around may can't detect this website to carry out the transmission of upstream data at present and thinks that present channel is idle, thus causes channel access to compete.

As shown in Figure 3, the covering that AP1 uses total power to send data is circle 1, the covering that AP2 uses total power to send data is circle 3, the covering that STA1 uses total power to send data is dotted line circle 4, AP2 is the concealed nodes of AP1, if STA1 total power sends data, then AP2 can hear the signal of STA1, is not the concealed nodes of STA1.If but the uplink transmission power after STA1 uses calibration sends, and the uplink transmission power after this calibration is when being less than the total power of self, as enclosed shown in 2, then AP2 can not hear that STA1 sends data, and think that present channel is idle, use total power to send data, so, then can disturb transmission and the reception of STA1 upstream data.In order to solve the problem of above-mentioned stealthy node, the present invention proposes following solution further:

Before uplink transmission power after website Use Adjustment carries out channel access or sends data, first use calibration power to send a request and send (Request to send, RTS) frame is for arranging suitable network allocation vector (Network Allocation Vector, NAV).After access point receives this RTS frame, use calibration power to respond compatible channel idle and can send (Clear tosend, CTS) frame, in this CTS frame, identical NAV territory is also set, this NAV territory is used to indicate the transmitting uplink data of a period of time for the website of a certain uplink transmission power, all websites that this access point is covered can not send data within this period, thus ensure that the transmitting uplink data of the website of a certain uplink transmission power can not be subject to the interference of other websites.

Further; the channel competition whether access point utilizes the current bit instruction website do not used to carry out based on upgoing O FDMA in CTS frame; such as use retry position or more data position as indicating bit; such as more data position is 1; represent that website can carry out the channel competition of OFDMA mode in above-mentioned protective time slot; carry out the transfer of data having power to control simultaneously, thus improve spectrum utilization efficiency.

It should be noted that, in the uplink transmission power calibration steps that the present embodiment provides, can be the scene access of OFDMA, can also be up MU-MIMO scene, and the common power of other non-OFDMA modes controls scene, does not limit herein.

Refer to Fig. 4, Fig. 4 is another flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides.Wherein the present embodiment is described using access point as main body, and as shown in Figure 4, the method can comprise the following steps.

401, to each website transmitted power calibration frame in WLAN (wireless local area network).

Access point is to each website transmitted power calibration frame in WLAN (wireless local area network), this calibration of power frame comprises target received power and current transmitted power, after each website receives this calibration of power frame, according to target received power and current transmitted power adjustment uplink transmission power, thus make access point receive the difference of the actual received power of different website transmission upstream data in the less scope preset, thus reach the object that normally can receive all customer data.

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

The uplink transmission power that website Use Adjustment is good sends upstream data to access point, and access point receives the upstream data that each website sends according to the uplink transmission power after adjustment.

In the present embodiment, access point point is to each website transmitted power calibration frame in WLAN (wireless local area network), make each website according to the transmitted power of this calibration of power framing control local terminal, thus make access point receive the difference of the actual received power of different website transmission upstream data in the less scope preset, thus solve to receive in upgoing O FDMA communication process different website send the difference of the actual received power of data excessive time be difficult to normally receive the problem of user data, reach the object that normally can receive all customer data.

It should be noted that in optional embodiment of the present invention, the quantity of website can be one, and now, access point to the website transmitted power calibration frame in WLAN (wireless local area network), and receives the upstream data of this website according to the uplink transmission power transmission after adjustment.

Refer to Fig. 5, Fig. 5 is another flow chart of a kind of uplink transmission power calibration steps that the embodiment of the present invention provides.Wherein the present embodiment is described using access point as main body, and as shown in Figure 5, the method can comprise the following steps.

501, the packet parameters that each website sends is received.

Access point receives the packet parameters that each website in WLAN (wireless local area network) sends, and this packet parameters comprises each website to the distance of access point or path loss.

502, according to packet parameters, each website is divided into groups, arrange and only have one group of website access channel at every turn, and to each grouping and setting target received power.

Access point receives the packet parameters that each website sends, namely after each website to the distance or path loss of access point, according to this distance or path loss, each website is divided into groups, arrange this access point only has one group of website to use OFDMA mode to access channel at every turn, and to each grouping and setting target received power, mapping relations are set by the packet number of each grouping and target received power.

503, access point is to each website transmitted power calibration frame in WLAN (wireless local area network).

Access point is to each website transmitted power calibration frame in WLAN (wireless local area network), and this calibration of power frame comprises the website of each grouping, each target received power of grouping correspondence, the current transmitted power of access point.This calibration of power frame also comprises power dynamics scope instructions field, and website can be finely tuned uplink transmission power according to power dynamics scope instructions field.Wherein, power dynamics scope instructions field can indicate in calibration of power frame, also can separately within a beacon frame with an element instruction, and the present invention does not limit.

504, the RTS frame of receiving station transmission.

Uplink transmission power after website uses calibration sends, and the uplink transmission power after this calibration is when being less than the total power of self, just likely there is the problem of stealthy node, in order to solve this problem, introduce RTS/CTS agreement in the present embodiment, concrete, first, website uses calibration power to send a RTS frame for arranging suitable NAV, and be used to indicate the transmitting uplink data of a period of time for the website of a certain uplink transmission power, access point receives this RTS frame.

505, CTS frame is returned according to RTS frame.

After the RTS frame that access point receiving station sends, calibration power is used to respond compatible CTS frame, in this CTS frame, identical NAV territory is also set, this NAV territory is used to indicate the transmitting uplink data of a period of time for the website of a certain uplink transmission power, all websites that this access point is covered can not send data within this period, thus ensure that the transmitting uplink data of the website of a certain uplink transmission power can not be subject to the interference of other websites.

506, the website of access point in this WLAN is broadcasted an access group instruction frame and is used to indicate the current grouping that can access channel.

Because target received power corresponding to each grouping is different, so in section at the same time, one group of website access channel can only be allowed, to ensure the normal reception of upstream data.In step 505, the NAV territory arranged in the CTS that access point sends in a wlan ensure that in the official hour section of NAV territory, only have one group of website can access channel carries out transmitting uplink data.And then access point is broadcasted an access group instruction frame to the website in WLAN and is used to indicate the current grouping that can access channel, thus can ensure the normal reception of these packet uplink data.

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

In the official hour section of NAV territory, access point receives the upstream data that in a certain grouping, each website sends according to the uplink transmission power after adjustment.

508, judged whether that new site is associated with this access point, or whether have the packet parameters of website change need change grouping.

In a wlan, likely have at any time new site be associated with this access point or have the packet parameters of website change need change grouping, whether access point needs periodic monitor to have new site to be associated with this access point, or whether have the packet parameters of website change need change grouping.

509, when having monitored new site and being associated with this access point, the packet parameters according to new site is divided into groups to this new site.

510, when monitor in this WLAN have the packet parameters of website change need change grouping time, change the grouping of this website, and to this website send grouping adjustment frame, wherein, grouping adjustment frame comprise new packet number.

511, to website transmitted power calibration frame.

When having monitored new site and being associated with this access point, the packet parameters according to new site has been divided into groups to this new site, then to this website transmitted power calibration frame; When monitor in this WLAN have the packet parameters of website change need change grouping time, change the grouping of this website, then to this website transmitted power calibration frame.

It should be noted that in optional embodiment of the present invention, the quantity of website can be one, and now, access point and single website carry out above-mentioned exchanges data.

Further, if access point uses power control techniques to carry out downlink data transmission, calibration power is first used to send compatible request transmission frame to website, after website receives this request transmission frame, returning compatible channel idle according to this request transmission frame can transmission frame, wherein, transmission frame is asked to comprise network allocation vector; The channel idle that access point receiving station returns can transmission frame, and to ensure the downlink data transmission of a certain grouping within the time of network allocation vector instruction, wherein, channel idle can comprise network allocation vector by transmission frame.

In another embodiment, access point is before transmitted power calibration frame, target received power is divided into several rank, then the calibration of power frame comprising different target received power is sent according to certain rule, after the calibration of power frame comprising a certain ranking subject received power sends, before next calibration of power frame sends, the website only having uplink transmission power to be less than the threshold value that this website presets can participate in channel competition, accesses.According to the method, when target received power is less, remote station can access, if the access of near-end website, then can only use lower transmitted power and modulation coding mode, efficiency is lower.When target received power is larger, remote station cannot access, and near-end website can use higher transmitted power and modulation coding mode, and spectrum utilization efficiency is higher.All websites that can access under certain target received power are classified as one group, and the website nearer due to distance access point can both access under different target received powers is arranged, and can be contained in multiple groups.Can ensure under this mechanism that the website far away apart from access point has an opportunity to access, improve the success rate of distance access point website access far away.

But according to above-mentioned packet mode, the website far away apart from access point only can be included in less group, and the probability of access is less than near-end website.In another embodiment, the access of the website that distance access point is nearer when limited target received power is less, such as access point can carry a uplink transmission power lower limit in calibration of power frame, the uplink transmission power calculating local terminal when website to be less than under uplink transmission power in limited time, does not allow this website to carry out channel access.Which improves spectrum utilization efficiency, also improve the fairness between distance access point website far away and the website nearer apart from access point simultaneously.

In the present embodiment, access point point is to each website transmitted power calibration frame in WLAN (wireless local area network), make each website according to the transmitted power of this calibration of power framing control local terminal, thus make access point receive the difference of the actual received power of different website transmission upstream data in the less scope preset, thus solve to receive in upgoing O FDMA communication process different website send the difference of the actual received power of data excessive time be difficult to normally receive the problem of user data, reach the object that normally can receive all customer data.And further, website in WLAN is divided into groups, different target received powers is arranged to each grouping, maximum operation transmitted power may be exceeded according to the uplink transmission power that calibration of power frame calculates to solve website and affect the problem of the transmission of upstream data.And further, controlling to bring new hidden node problem to introducing power, by introducing RTS/CTS agreement, avoiding a certain group when upstream data sends by sending the RTS/CTS frame carrying NAV territory, other groupings also carry out transfer of data, thus can avoid hidden node problem.

Below by an embody rule example, the present invention will be described in more detail.Refer to Fig. 6, Fig. 6 is the flow chart of a kind of uplink transmission power calibration steps that application examples of the present invention provides.As shown in Figure 6, the method is concrete:

Such as in the WLAN of use-case, an access point, a n-1 website should be provided with, numbering respectively slave site 1, to website n-1.Access point and n-1 website have up-downgoing exchanges data, should in use-case, and for convenience of description, only the up-downgoing exchanges data intercepted between website 1 and access point specifically describes.

1, packet parameters is sent.

First each website in WLAN sends packet parameters to access point, and this packet parameters can be the path loss between website to access point, or the distance between website to access point.

2, receive packet parameters and according to packet parameters, each website divided into groups.

Access point receives the packet parameters of each website, and according to packet parameters, each website is divided into groups, such as path loss is classified as one group within 50db, and path loss is classified as again one group between 50db to 70db, the visual actual conditions of rule of classification are arranged, and do not limit herein.

3, transmitted power calibration frame.

Calibration of power frame is broadcast to all websites by access point, and wherein, calibration of power frame comprises calibration of power frame and comprises the website of each grouping, each target received power of grouping correspondence, the current transmitted power of access point.This calibration of power frame also comprises power dynamics scope instructions field, and website can be finely tuned uplink transmission power according to power dynamics scope instructions field.Wherein, power dynamics scope instructions field can indicate in calibration of power frame, also can separately within a beacon frame with an element instruction, and the present invention does not limit.

Access point carries out multi-upstream access according to each grouping of the regular dispatch of taking turns preset.

First access point can also broadcast the grouping information of all websites and the target received power of each grouping, then transmitted power calibration frame can access channel to indicate which grouping.

4, received power is calibrated frame and is calculated uplink transmission power.

Website 1 received power calibration frame also calculates uplink transmission power, concrete:

First, after website 1 receives the calibration of power frame of access point transmission, measure the received power that local terminal receives this calibration of power frame, and calculate the path loss of this website to access point according to the current transmitted power of carrying in received power and calibration of power frame, concrete:

Path loss=current transmitted power-received power.

Then, after calculating local terminal to the path loss of access point, website 1 calculates according to target received power and path loss the target transmit power oneself wanted, concrete:

Target transmit power=target received power+path loss.

Finally, website 1 based target transmitted power calculates uplink transmission power, and the transmission bandwidth of the transmission bandwidth sum access point of this website is known and is kept at this locality in advance, concrete:

5, RTS frame is sent.

Uplink transmission power after website uses calibration sends, and the uplink transmission power after this calibration is when being less than the total power of self, just likely there is the problem of stealthy node, in order to solve this problem, introduce RTS/CTS agreement in the present embodiment, concrete, first, website uses calibration power to send a RTS frame for arranging suitable NAV, is used to indicate the transmitting uplink data of a period of time for the website of a certain uplink transmission power.

6, CTS frame is returned.

7, broadcast an access group instruction frame and be used to indicate the current grouping that can access channel.

Because target received power corresponding to each grouping is different, so in section at the same time, one group of website access channel can only be allowed, to ensure the normal reception of upstream data.Carrying out all preparation, before can carrying out channel access, access point is broadcasted an access group instruction frame and is used to indicate the current grouping that can access channel.

8, the threshold value whether uplink transmission power is greater than this website and presets is judged.

The uplink transmission power calculated in step 4 likely can be greater than the threshold value that this website presets, if be greater than, this website just cannot carry out the transmission of upstream data with this uplink transmission power, this threshold value can be the transmission upper limit or the regulation power-limiting of this website, or other power preset; So, after calculating uplink transmission power, need to judge the threshold value whether uplink transmission power is greater than this website and presets, if uplink transmission power is greater than the threshold value that this website presets, the threshold value then using this website to preset carries out upstream data transmission as uplink transmission power, if uplink transmission power is not more than the threshold value that this website presets, then the uplink transmission power calculated is used to send upstream data.

In practical application, under the scene that the coverage of base station sub-system is larger, the target transmit power that website calculates according to calibration of power frame for the nearer website of distance access point and distance access point website far away may difference larger, if ensure that the performance of near-end website reaches best, then the uplink transmission power of remote station may exceed the threshold value preset, such as, send the upper limit or regulation power-limiting; On the contrary, if ensure that the uplink transmission power of remote station is no more than the threshold value preset, then the performance of near-end website just may be very poor, this is because in order to the not super threshold value preset of the uplink transmission power ensureing remote station, then access point can only select a less target received power, thus also can only select lower modulation coding mode to near-end website.

So, need to manage to allow website to carry out fine setting to the uplink transmission power calculated and solve the problems referred to above.In practical operation, access point does not require that the uplink transmission power of all websites received is completely the same, allows the scope of a dynamic change, so, in the scope that website just can allow at access point, uplink transmission power is finely tuned.Concrete solution is, also carries power dynamics scope instructions field at calibration of power frame, and website can be finely tuned uplink transmission power according to power dynamics scope instructions field.Wherein, power dynamics scope instructions field can indicate in calibration of power frame, also can separately within a beacon frame with an element instruction, and the present invention does not limit.

If website judges the threshold value that uplink transmission power is not more than this website and presets, then get the value that described transmitted power dynamic range instructions field is added with target transmit power, minimum value after compared with between the threshold value preset with this website, carries out upstream data transmission as the uplink transmission power after fine setting.Certainly, in actual applications, website also can select a suitable power as uplink transmission power according to the needs of up modulation coding mode, and the present invention does not limit.

9.1, the threshold value using this website to preset sends upstream data as uplink transmission power.

If judge the threshold value that uplink transmission power is greater than this website and presets in step 8, then the threshold value using this website to preset sends upstream data as uplink transmission power.

9.2, uplink transmission power is used to send upstream data.

If judge in step 8 that the uplink transmission power after uplink transmission power or fine setting is not more than the threshold value that this website presets, then the uplink transmission power after uplink transmission power or fine setting is used to send upstream data.

10, upstream data is received.

Access point receives the upstream data that each website in the grouping of current access channel sends.

11, website n sends packet parameters.

New association website n sends packet parameters to access point.

12, determined whether that new site is associated with this access point.

Access point has determined whether that new site is associated with this access point.

13, transmitted power calibration frame after grouping.

Access point receives the packet parameters that new association website n sends, and judge that new station associate is to this access point, after the website newly associated being divided into groups according to the packet parameters received, to website n transmitted power calibration frame, this calibration of power frame comprises the website of each grouping, each target received power of grouping correspondence, the current transmitted power of access point.This calibration of power frame also comprises power dynamics scope instructions field, and website can be finely tuned uplink transmission power according to power dynamics scope instructions field.Wherein, power dynamics scope instructions field can indicate in calibration of power frame, also can separately within a beacon frame with an element instruction, and the present invention does not limit.

14, website 1 sends the packet parameters upgraded.

The packet parameters that website 1 monitors this website changes, and the packet parameters of renewal is sent to access point.

15, determine whether that the packet parameters of website changes to need to change grouping.

Access point determines whether that the packet parameters of website changes to be needed to change grouping.

16, after changing grouping, transmitted power calibrates frame.

After packet parameters after the renewal that access point receiving station 1 sends, judge that website 1 needs to change grouping, website 1 is changed grouping, and sending the calibration of power frame of new grouping, this calibration of power frame comprises the website of each grouping, each target received power of grouping correspondence, the current transmitted power of access point.This calibration of power frame also comprises power dynamics scope instructions field, and website can be finely tuned uplink transmission power according to power dynamics scope instructions field.Wherein, power dynamics scope instructions field can indicate in calibration of power frame, also can separately within a beacon frame with an element instruction, and the present invention does not limit.

In above-mentioned application examples, adopt the mode of display grouping, namely each website knows which grouping this website belongs to.Access point adopts stealthy packet mode also can reach same effect, concrete:

Access point is before transmitted power calibration frame, target received power is divided into several rank, then the calibration of power frame comprising different target received power is sent according to certain rule, after the calibration of power frame comprising a certain ranking subject received power sends, before next calibration of power frame sends, the website only having uplink transmission power to be less than the threshold value that this website presets can participate in channel competition, accesses.According to the method, when target received power is less, remote station can access, if the access of near-end website, then can only use lower transmitted power and modulation coding mode, efficiency is lower.When target received power is larger, remote station cannot access, and near-end website can use higher transmitted power and modulation coding mode, and spectrum utilization efficiency is higher.All websites that can access under certain target received power are classified as one group, and the website nearer due to distance access point can both access under different target received powers is arranged, and can be contained in multiple groups.Can ensure under this mechanism that the website far away apart from access point has an opportunity to access, improve the success rate of distance access point website access far away.

Refer to Fig. 7, Fig. 7 is the logical construction schematic diagram of a kind of website that the embodiment of the present invention provides.As shown in Figure 7, this website comprises:

Calibration of power frame receiver module 701, for receiving the calibration of power frame that access point sends, and export uplink transmission power adjusting module 702 to, this calibration of power frame comprises target received power and current transmitted power;

Uplink transmission power adjusting module 702, for according to the target received power received and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset.

In the present embodiment, the calibration of power frame that website sends by receiving access point, and according to the target received power carried in this calibration of power frame and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset; Thus the uplink transmission power difference of each website in the WLAN (wireless local area network) that access point is received is less, thus upstream data can be received better.

Refer to Fig. 8, Fig. 8 is another logical construction schematic diagram of a kind of website that the embodiment of the present invention provides.As shown in Figure 8, this website comprises:

Packet parameters sending module 801, for for sending current packet parameters to access point, make access point generate according to packet parameters the website that grouping information arranges access channel, and to each grouping and setting target received power, packet parameters is included in distance or the path loss of access point.

Grouping information receiver module 802, for receiving the grouping information of access point transmission thus making website divide into groups according to grouping information, grouping information comprises the target received power of the mark of the website that each group comprises, the packet number of each group and correspondence; After accepting the calibration of power frame of access point transmission to make website, the target received power carried according to calibration of power frame selects the grouping of current access, thus the target received power that the grouping of current access is carried according to calibration of power frame and current transmitted power adjustment uplink transmission power.

Calibration of power frame receiver module comprises:

Measuring unit 8031, receives the received power of described calibration of power frame for measuring this website, and calculates the path loss of this website to access point according to this received power and current transmitted power, and exports target transmit power computing unit 8032 to.

Target transmit power computing unit 8032, for calculating target transmit power according to target received power and path loss, and exports uplink transmission power computing unit 8033 to.

Uplink transmission power computing unit 8033, for according to target transmit power with send bandwidth calculation uplink transmission power, wherein send bandwidth and comprise the local transmission bandwidth sending bandwidth sum access point, and export uplink transmission power to uplink transmission power adjusting module 804.

Uplink transmission power adjusting module 804, for adjusting uplink transmission power according to the target received power received and current transmitted power, and export uplink transmission power fine setting module 805 to, to make the received power of access point in different sub carrier or subchannel in the difference range preset.

Further, calibration of power frame also comprises power dynamics scope instructions field; Website in the present embodiment also comprises:

Uplink transmission power fine setting module 805, for finely tuning described uplink transmission power according to power dynamics scope instructions field, the uplink transmission power after using fine setting to make this website carries out upstream data transmission.

Further, the website in the present embodiment also comprises:

Packet lookup module 806, for when the packet parameters of this website changes, finds corresponding packet number according to the packet parameters after change, and exports renewal frame sending module 807 to.

Upgrade frame sending module 807, for sending grouping update request frame to access point, wherein, grouping update request frame comprises new packet number.

Grouping upgrades acknowledgement frame receiver module 808, and the grouping sent for receiving access point upgrades acknowledgement frame.

Further, the website in the present embodiment also comprises:

New argument sending module 809, for when the packet parameters of this website changes, send new parameter to access point, to make this access point according to the new parameter received for this website upgrades grouping, and send grouping adjustment frame to this website, wherein grouping adjustment frame comprises new packet number.

Grouping update module 810, for receiving the grouping adjustment frame that access point sends, and upgrades grouping according to this grouping adjustment frame.

It should be noted that, module 806,807,808 and 809 and 810 in Fig. 8 in dotted line frame, that website end dominates switching grouping and access point end dominates functional module corresponding to switching grouping two kinds of modes, in actual applications, at one time, only have a kind of mode to be used, the module group namely only having a dotted line frame is active.The module group of two dotted line frames can exist simultaneously, but the same time only has the module group of a dotted line frame to be active.

Further, the website in the present embodiment also comprises:

Request transmission frame sending module 811, for sending compatible request transmission frame to access point, can transmission frame to make access point return compatible channel idle according to this request transmission frame, wherein, request transmission frame comprises network allocation vector.

Channel idle can transmission frame receiver module 812, can transmission frame for receiving channel idle that access point returns, to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, wherein channel idle can comprise network allocation vector by transmission frame.

In the present embodiment, the calibration of power frame that website sends by receiving access point, and according to the target received power carried in this calibration of power frame and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset; Thus the uplink transmission power difference of each website in the WLAN (wireless local area network) that access point is received is less, thus upstream data can be received better.And by being carried out by website dividing into groups to access channel respectively, to avoid accessing channel with access point apart from excessive website simultaneously, thus data can be received better.

Refer to Fig. 9, Fig. 9 is the logical construction schematic diagram of a kind of access point that the embodiment of the present invention provides.As shown in Figure 9, this access point comprises:

Calibration of power frame sending module 901, for calibrating frame to the website transmitted power in WLAN (wireless local area network), the target received power carried according to calibration of power frame to make website and current transmitted power adjustment uplink transmission power, thus make access point receiving station send the difference of the actual received power of upstream data in the scope preset.

Upstream data receiver module 902, for receiving the upstream data that each website sends according to the uplink transmission power after adjustment.

Refer to Figure 10, Figure 10 is another logical construction schematic diagram of a kind of access point that the embodiment of the present invention provides.As shown in Figure 10, this access point comprises:

Module 1001 being set, for arranging multiple target received power, and this target received power being divided into several rank.

Lower transmit power limit broadcast module 1002, for broadcast station lower transmit power limit in this WLAN (wireless local area network), thus arranges the website that refusal uplink transmission power is less than this lower transmit power limit and carries out channel access.

Packet parameters receiver module 1003, for receiving the packet parameters that each website sends, and exports grouping module to, and exports grouping module 1004 to, and wherein packet parameters comprises distance or the path loss that this website arrives access point.

Grouping module 1004, for dividing into groups to each website according to distance or path loss, arranging and only having one group of website access channel at every turn, and to each grouping and setting target received power.

It should be noted that, in dotted line frame 1001,1002 modules and 1003,1004 modules are two kinds of modes of dividing into groups to the website in WLAN, 1001,1002 modules are modules that recessive packet mode is corresponding, 1003,1004 modules are modules that display packet mode is corresponding, at one time, access point only uses a kind of packet mode, namely 1001,1002 modules in dotted line frame and 1003,1004 modules can exist simultaneously, but at one time, only have one group of module to be in active state.

Calibration of power frame sending module 1005, for the calibration of power frame for comprising different target received power to website transmission, to make after the calibration of power frame comprising certain target received power sends, before the calibration of power frame that the next one comprises another target received power sends, uplink transmission power is less than the website energy contention access channel of the maximum permission transmitted power of website.

Upstream data receiver module 1009, for receiving the upstream data that each website sends according to the uplink transmission power after adjustment.

Further, access point also comprises:

RTS frame receiver module 1006, for the RTS frame that receiving station sends, wherein, RTS frame comprises network allocation vector.

CTS frame sending module 1007, for can transmission frame according to the RTS frame Return Channel free time, to ensure the transmitting uplink data of a certain grouping in time of indicating at described network allocation vector, wherein CTS frame comprises this network allocation vector.

Access group instruction frame broadcast module 1008, broadcast an access group instruction frame for the website in this WLAN (wireless local area network) and be used to indicate the current grouping that can access channel, wherein access group instruction frame comprises packet number.

Further, the access point in the present embodiment also comprises:

Request transmission frame sending module, for the request transmission frame that receiving station sends, request transmission frame comprises network allocation vector.

Channel idle can transmission frame module, and the channel idle returned for receiving station can transmission frame, and to ensure the downlink data transmission of a certain grouping within the time of, network allocation vector instruction, wherein, channel idle can comprise network allocation vector by transmission frame.

Refer to Figure 11, Figure 11 is the another logical construction schematic diagram of a kind of website that the embodiment of the present invention provides.The website 1101 of Figure 11 comprises processor 1201, memory 1202 and receiver 1203.Processor 1201, memory 1202 are connected by bus system 1204 with receiver 1203.

The calibration of power frame that receiver 1203 sends for receiving access point, calibration of power frame comprises target received power and current transmitted power.

Memory 1202 is for storing the instruction making processor 1201 perform following operation: according to target received power and current transmitted power adjustment uplink transmission power, to make the received power of access point in different sub carrier or subchannel in the difference range preset.

In addition, website 1101 can also comprise reflector 1205 and antenna 1206 etc., and processor 1201 controls the operation of website 1101, and processor 1201 can also be called CPU (Central Processing Unit, CPU).Memory 1202 can comprise read-only memory and random access memory, and provides instruction and data to processor 1201.A part for memory 1202 can also comprise nonvolatile RAM (NVRAM).In concrete application, receiver 1203 and reflector 1205 can be coupled to antenna 1206.Each assembly of website 1101 is coupled by bus system 1204, and wherein bus system 1204 is except comprising data/address bus, can also comprise power bus, control bus and status signal bus in addition etc.But for the purpose of clearly demonstrating, in the drawings various bus is all designated as bus system 1204.

The method that the invention described above embodiment discloses can be applied in processor 1201, or is realized by processor 1201.Processor 1201 may be a kind of integrated circuit (IC) chip, has the disposal ability of signal.In implementation procedure, each step of said method 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) (ASIC), ready-made programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic, discrete hardware components.Can realize or perform disclosed each method, step and the logic diagram in the embodiment of the present invention.The processor etc. of general processor can be microprocessor or this processor also can be any routine.Step in conjunction with the method disclosed in the embodiment of the present invention directly can be presented as that hardware decoding processor is complete, or combines complete by the hardware in decoding processor and software module.Software module can be positioned at random asccess memory, flash memory, read-only memory, in the storage medium of this area maturations such as programmable read only memory or electrically erasable programmable memory, register.This storage medium is positioned at memory 1202, and processor 1201 reads the information in memory 1202, completes the step of said method in conjunction with its hardware.

Alternatively, as an embodiment, the received power of received power calibration frame measured by processor 1201, and calculates the path loss of access point according to received power and current transmitted power; Target transmit power is calculated according to target received power and path loss; According to target transmit power and transmission bandwidth calculation uplink transmission power, wherein send bandwidth and comprise the local transmission bandwidth sending bandwidth sum access point.

Alternatively, as an embodiment, reflector 1205 sends current packet parameters to access point, makes access point generate according to packet parameters the website that grouping information arranges access channel, and to each grouping and setting target received power, packet parameters is included in distance or the path loss of access point; Receiver 1203 receives the grouping information of access point transmission thus processor 1201 is divided into groups according to grouping information, and grouping information comprises the target received power of the mark of the website that each group comprises, the packet number of each group and correspondence; After the calibration of power frame sent to make reception access point, the target received power carried according to calibration of power frame selects the grouping of current access, thus the target received power that the grouping of current access is carried according to calibration of power frame and current transmitted power adjustment uplink transmission power.

Alternatively, as an embodiment, memory 1202 is for storing the instruction making processor 1201 perform following operation: when packet parameters changes, and finds corresponding packet number according to the packet parameters after change.Reflector 1205 is for sending grouping update request frame to access point, grouping update request frame comprises new packet number; Receiver 1203, for receiving the grouping adjustment frame that access point sends, grouping adjustment frame comprises new packet number.

Alternatively, as an embodiment, reflector 1205 sends compatible request transmission frame for using calibration power to access point, can transmission frame to make access point return compatible channel idle according to request transmission frame, and request transmission frame comprises network allocation vector; Receiver 1203, can transmission frame for receiving channel idle that access point returns, and to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, channel idle can comprise network allocation vector by transmission frame.

Refer to Figure 12, Figure 12 is the another logical construction schematic diagram of a kind of access point that the embodiment of the present invention provides.The access point 1102 of Figure 12 comprises processor 1301, memory 1302, reflector 1305 and receiver 1303.Processor 1301, memory 1302, reflector 1305 are connected by bus system 1304 with receiver 1303.

Reflector 1305 is for calibrating frame to the website transmitted power in WLAN (wireless local area network), the target received power carried according to calibration of power frame to make website and current transmitted power adjustment uplink transmission power, thus make access point receiving station send the difference of the actual received power of upstream data in the scope preset;

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

In addition, access point 1102 can also comprise antenna 1306, and processor 1301 controls the operation of access point 1102, and processor 1301 can also be called CPU (Central Processing Unit, CPU).Memory 1302 can comprise read-only memory and random access memory, and provides instruction and data to processor 1301.A part for memory 1302 can also comprise nonvolatile RAM (NVRAM).In concrete application, receiver 1303 and reflector 1305 can be coupled to antenna 1306.Each assembly of access point 1102 is coupled by bus system 1304, and wherein bus system 1304 is except comprising data/address bus, can also comprise power bus, control bus and status signal bus in addition etc.But for the purpose of clearly demonstrating, in the drawings various bus is all designated as bus system 1304.

The method that the invention described above embodiment discloses can be applied in processor 1301, or is realized by processor 1301.Processor 1301 may be a kind of integrated circuit (IC) chip, has the disposal ability of signal.In implementation procedure, each step of said method 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) (ASIC), ready-made programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic, discrete hardware components.Can realize or perform disclosed each method, step and the logic diagram in the embodiment of the present invention.The processor etc. of general processor can be microprocessor or this processor also can be any routine.Step in conjunction with the method disclosed in the embodiment of the present invention directly can be presented as that hardware decoding processor is complete, or combines complete by the hardware in decoding processor and software module.Software module can be positioned at random asccess memory, flash memory, read-only memory, in the storage medium of this area maturations such as programmable read only memory or electrically erasable programmable memory, register.This storage medium is positioned at memory 1302, and processor 1301 reads the information in memory 1302, completes the step of said method in conjunction with its hardware.

Alternatively, as an embodiment, memory 1302 is for storing the instruction making processor 1301 perform following operation: arrange multiple target received power, and target received power is divided into multiple rank; Reflector 1305 is for sending the calibration of power frame comprising different target received power to website, to make after the calibration of power frame comprising certain target received power sends, before the calibration of power frame that the next one comprises another target received power sends, uplink transmission power is less than the website energy contention access channel of the maximum permission transmitted power of website.

Alternatively, as an embodiment, receiver 1303 receives the packet parameters that each website sends, and packet parameters comprises distance or the path loss that this website arrives access point; According to distance or path loss, each website is divided into groups, arrange and only have one group of website access channel at every turn, and to each grouping and setting target received power; Calibration of power frame also comprises packet number, wherein packet number and target received power one_to_one corresponding.

Alternatively, as an embodiment, memory 1302 is for storing the instruction making processor 1301 perform following operation: when there being new site to be associated with this access point, and the packet parameters according to new site is divided into groups to new site; Reflector 1305 is for calibrating frame to new site transmitted power.

Alternatively, as an embodiment, memory 1302 is for storing the instruction making processor 1301 perform following operation: for when detecting in this WLAN (wireless local area network) that having the packet parameters of website to change needs to change grouping, change the grouping of website, reflector 1305 sends grouping adjustment frame to website, and grouping adjustment frame comprises new packet number.

Alternatively, as an embodiment, the request transmission frame that receiver 1303 sends for receiving station, request transmission frame comprises network allocation vector;

Reflector 1303 is for can transmission frame according to the request transmission frame Return Channel free time, and to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, channel idle can comprise network allocation vector by transmission frame.Refer to Figure 13, Figure 13 is the logical construction schematic diagram of a kind of wireless lan communication system that the embodiment of the present invention provides.As shown in figure 13, this system comprises:

Website 1101, for receiving the calibration of power frame that access point sends, described calibration of power frame comprises target received power and current transmitted power; According to described target received power and described current transmitted power adjustment uplink transmission power, to make the received power of described access point in different sub carrier or subchannel in the difference range preset;

Access point 1102, for calibrating frame to each website transmitted power in WLAN (wireless local area network), described calibration of power frame comprises target received power and current transmitted power, to make each website according to described target received power and described current transmitted power adjustment uplink transmission power; Receive the upstream data that each website sends according to the uplink transmission power after adjustment.

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

Measure the received power of this equipment received power calibration frame, and calculate the path loss of this equipment to access point according to this received power and current transmitted power;

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

According to target transmit power and the transmission bandwidth calculation uplink transmission power of this equipment of transmission bandwidth sum being kept at local access point in advance.

Further, calibration of power frame also comprises power dynamics scope instructions field; Website is after according to calibration of power framing control uplink transmission power, and also for finely tuning uplink transmission power according to described power dynamics scope instructions field, the uplink transmission power after finely tuning to make this equipment use carries out upstream data transmission.

Further, website 1101 is also for sending current packet parameters to access point 1102, and wherein packet parameters comprises distance or the path loss that this equipment arrives access point; Receive the grouping information that returns of access point, wherein grouping information comprises each group of corresponding packet number and target received power.

Access point 1102, also for dividing into groups to each website 1101 according to packet parameters, arranging and only having one group of website access channel at every turn, and to each grouping and setting target received power.

Further, website 1101, also for when the packet parameters of this equipment changes, finds corresponding packet number according to the packet parameters after change; Send grouping update request frame to access point 1102, the update request frame that wherein divides into groups comprises new packet number; Receive the grouping adjustment frame that access point 1102 sends, wherein grouping adjustment frame comprises new packet number.

Access point 1102 also for have in this WLAN (wireless local area network) the packet parameters of website 1101 change need change grouping time, change the grouping of this website 1101, and to this website send grouping adjustment frame.

Further, website 1101 also for when the packet parameters of this equipment changes, sends new parameter to access point 1102; Receive the grouping adjustment frame that access point 1102 sends, and upgrade grouping according to grouping adjustment frame.

When access point 1102 also for having the packet parameters of website to change to need to change grouping in this WLAN (wireless local area network), change the grouping of website, and send grouping adjustment frame to website, wherein grouping adjustment frame comprises new packet number.

Further, access point 1102 to before each website transmitted power calibration frame in WLAN (wireless local area network) also for arranging multiple target received power, and target received power is divided into several rank.

Access point 1102 is concrete to the step of each website transmitted power calibration frame in WLAN (wireless local area network):

To each website (alternatively, can according to the order preset to each website in WLAN (wireless local area network)) send and comprise the calibration of power frame of different target received power, to make after the calibration of power frame comprising certain target received power sends, before the calibration of power frame that the next one comprises another target received power sends, uplink transmission power is less than the website energy contention access channel of the maximum permission transmitted power of website.

Further, access point arranges multiple target received power, and described target received power is divided into several rank after be also used for broadcast station lower transmit power limit in this WLAN (wireless local area network), thus the website that refusal uplink transmission power is less than this lower transmit power limit be set carry out channel access.

A nearly step, step from access point 1102 to each website transmitted power calibration frame in WLAN (wireless local area network) before also for receiving the packet parameters that each website sends, wherein packet parameters comprises website to the distance of access point or path loss; According to the grouping of this distance or path loss determination website, arrange and only have one group of website access channel at every turn, and to each grouping and setting target received power; Wherein, calibration of power frame also comprises packet number, wherein packet number and target received power one_to_one corresponding.

Further, access point 1102 receive each website according to adjustment after uplink transmission power send upstream data after also for when there being new site to be associated with this access point, the packet parameters according to new site is divided into groups to this new site; And to this new site transmitted power calibration frame.

Further, website is also for using calibration power to send compatible RTS frame to access point, and wherein RTS frame comprises network allocation vector; Receive the CTS frame that access point returns, wherein CTS frame comprises network allocation vector.

Access point is also for the RTS frame of receiving station transmission; Return CTS frame according to this RTS frame again, to ensure the transmitting uplink data of a certain grouping within the time of network allocation vector instruction, wherein CTS frame comprises network allocation vector.

Further, access point is also for using calibration power to send compatible RTS frame to website, and wherein RTS frame comprises network allocation vector; Receive the CTS frame that access point returns, wherein CTS frame comprises network allocation vector.

Website is also for receiving the RTS frame that access point sends; Return CTS frame according to this RTS frame again, to ensure the downlink data transmission of a certain grouping within the time of network allocation vector instruction, wherein CTS frame comprises network allocation vector.

Further, access point is also broadcasted an access group instruction frame for the website in this WLAN (wireless local area network) and is used to indicate the current grouping that can access channel, and wherein access group instruction frame comprises packet number.

It should be noted that, in the wireless lan communication system that the present embodiment provides, can be the scene access of OFDMA, can also be up MU-MIMO scene, and the common power of other non-OFDMA modes controls scene, does not limit herein.

Further, in optional embodiment of the present invention, wireless lan communication system of the present invention also can comprise the website described in Fig. 4 or Fig. 5 and the access point described in Fig. 7 or Fig. 8.

In several execution modes that the application provides, should be understood that, disclosed system, apparatus and method, can realize by another way.Such as, device embodiments described above is only schematic, such as, the division of described module or unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.

The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of present embodiment scheme.

In addition, each functional unit in each execution mode of the application can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.

If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that the technical scheme of the application contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) or processor (processor) perform all or part of step of method described in each execution mode of the application.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.

Claims

1. a uplink transmission power calibration steps, is characterized in that, comprises the steps:

Receive the calibration of power frame that access point sends, described calibration of power frame comprises target received power and current transmitted power;

According to described target received power and described current transmitted power adjustment uplink transmission power, to make the received power of described access point in different sub carrier or subchannel in the difference range preset.

2. method according to claim 1, is characterized in that, described according to target received power and current transmitted power adjustment uplink transmission power comprise:

Measure the received power receiving described calibration of power frame, and calculate the path loss of described access point according to described received power and described current transmitted power;

Target transmit power is calculated according to described target received power and described path loss;

Uplink transmission power according to described target transmit power and transmission bandwidth calculation, wherein said transmission bandwidth comprises the local transmission bandwidth sending access point described in bandwidth sum.

3. either method according to claim 1 and 2, is characterized in that, also comprises before the step of the calibration of power frame that described reception access point sends:

Current packet parameters is sent to described access point, described access point is made to generate according to described packet parameters the website that grouping information arranges access channel, and to target received power described in each grouping and setting, described packet parameters is included in the distance of described access point or described path loss;

Receive the described grouping information of described access point transmission thus divide into groups according to described grouping information, described grouping information comprises the described target received power of the mark of the website that each group comprises, the packet number of each group and correspondence; After the calibration of power frame sent to make reception access point, the described target received power carried according to described calibration of power frame selects the grouping of current access, thus the target received power that the grouping of current access is carried according to described calibration of power frame and described current transmitted power adjustment uplink transmission power.

4. method according to claim 3, is characterized in that:

When described packet parameters changes, find corresponding packet number according to the packet parameters after change;

Send grouping update request frame to access point, described grouping update request frame comprises new packet number;

Receive the grouping adjustment frame that described access point sends, described grouping adjustment frame comprises new packet number.

5. the method according to any one of claim 3 to 4, is characterized in that, also comprises after the step of the calibration of power frame that described reception access point sends:

Calibration power is used to send compatible request transmission frame to described access point, can transmission frame to make described access point return compatible channel idle according to described request transmission frame, described request transmission frame comprises network allocation vector;

Receiving channel idle that described access point returns can transmission frame, and to ensure the transmitting uplink data of a certain grouping in time of indicating at described network allocation vector, described channel idle can comprise described network allocation vector by transmission frame.

6. a uplink transmission power calibration steps, is characterized in that, comprises the steps:

To the website transmitted power calibration frame in WLAN (wireless local area network), the target received power carried according to described calibration of power frame to make described website and current transmitted power adjustment uplink transmission power, thus make access point receive described website to send the difference of the actual received power of upstream data in the scope preset;

Receive the upstream data that described website sends according to the uplink transmission power after adjustment.

7. method according to claim 6, is characterized in that, also comprises before the described step to the described website transmitted power calibration frame in WLAN (wireless local area network):

Multiple target received power is set, and described target received power is divided into multiple rank;

Describedly to comprise to the described website transmitted power calibration frame in WLAN (wireless local area network):

The calibration of power frame comprising different target received power is sent to described website, to make after the calibration of power frame comprising certain target received power sends, before the calibration of power frame that the next one comprises another target received power sends, described uplink transmission power is less than the website energy contention access channel of the maximum permission transmitted power of website.

8. method according to claim 7, is characterized in that, described access point also comprised before the described website transmitted power in WLAN (wireless local area network) calibrates the step of frame:

Receive the packet parameters that described website sends, described packet parameters comprises described website to the distance of described access point or path loss;

Determine the grouping of described website according to described distance or described path loss, arrange and only have one group of website access channel at every turn, and to each grouping and setting target received power;

Described calibration of power frame also comprises packet number, wherein packet number and target received power one_to_one corresponding.

9. method according to claim 8, is characterized in that, also comprises after the step of the upstream data that the described website of described reception sends according to the uplink transmission power after adjustment:

When there being new site to be associated with this access point, the packet parameters according to described new site is divided into groups to described new site;

To described new site transmitted power calibration frame.

10. method according to claim 9, is characterized in that, also comprises after the step of the upstream data that the described website of described reception sends according to the uplink transmission power after adjustment:

When detecting in this WLAN (wireless local area network) that having the packet parameters of website to change needs to change grouping, change the grouping of described website, and send grouping adjustment frame to described website, described grouping adjustment frame comprises new packet number.

11. methods according to claim 10, is characterized in that, also comprise after the described step to the described website transmitted power calibration frame in WLAN (wireless local area network):

Receive the request transmission frame that described website sends, described request transmission frame comprises network allocation vector;

Can transmission frame according to the described request transmission frame Return Channel free time, to ensure the transmitting uplink data of a certain grouping in time of indicating at described network allocation vector, described channel idle can comprise described network allocation vector by transmission frame.

12. 1 kinds of websites, is characterized in that, comprising:

Calibration of power frame receiver module, for receiving the calibration of power frame that access point sends, described calibration of power frame comprises target received power and current transmitted power;

Uplink transmission power adjusting module, for according to described target received power and described current transmitted power adjustment uplink transmission power, to make the received power of described access point in different sub carrier or subchannel in the difference range preset.

13. websites according to claim 12, is characterized in that, described calibration of power frame receiver module comprises:

Measuring unit, for measuring the received power receiving described calibration of power frame, and calculates the path loss of described access point according to described received power and described current transmitted power;

Target transmit power computing unit, for calculating target transmit power according to described target received power and described path loss;

Uplink transmission power computing unit, for uplink transmission power according to described target transmit power and transmission bandwidth calculation, wherein said transmission bandwidth comprises the local transmission bandwidth sending access point described in bandwidth sum.

14., according to claim 12 to the website described in 13 any one, is characterized in that, described website also comprises:

Packet parameters sending module, for sending current packet parameters to described access point, described access point is made to generate according to described packet parameters the website that grouping information arranges access channel, and to target received power described in each grouping and setting, described packet parameters is included in the distance of described access point or described path loss;

Grouping information receiver module, for receiving the described grouping information of described access point transmission thus making described uplink transmission power computing unit divide into groups according to described grouping information, described grouping information comprises the target received power of the mark of the website that each group comprises, the packet number of each group and correspondence; After the described calibration of power frame sent to make the described access point of reception, described uplink transmission power adjusting module selects the grouping of current access according to the target received power that described calibration of power frame carries, thus the target received power that the grouping of current access is carried according to described calibration of power frame and current transmitted power adjustment uplink transmission power.

15. websites according to claim 14, is characterized in that, described website also comprises:

Packet lookup module, when described packet parameters changes, finds corresponding packet number according to the packet parameters after change;

Upgrade frame sending module, for sending grouping update request frame to access point, described grouping update request frame comprises new packet number;

Grouping upgrades acknowledgement frame receiver module, and for receiving the grouping adjustment frame that described access point sends, described grouping adjustment frame comprises new packet number.

16., according to claim 14 to the website described in 15 any one, is characterized in that, described website also comprises:

Request transmission frame sending module, for using calibration power to send compatible request transmission frame to access point, can transmission frame to make described access point return compatible channel idle according to described request transmission frame, described request transmission frame comprises network allocation vector;

Channel idle can transmission frame receiver module, can transmission frame for receiving channel idle that described access point returns, to ensure the transmitting uplink data of a certain grouping in time of indicating at described network allocation vector, described channel idle can comprise described network allocation vector by transmission frame.

17. 1 kinds of access points, is characterized in that, comprising:

Calibration of power frame sending module, for the website transmitted power calibration frame in WLAN (wireless local area network), the target received power carried according to described calibration of power frame to make described website and current transmitted power adjustment uplink transmission power;

Upstream data receiver module, for receive described website according to adjustment after uplink transmission power send upstream data thus make described access point receive described website send upstream data actual received power difference preset scope in.

18. access points according to claim 17, is characterized in that, described access point also comprises:

Module being set, for arranging multiple target received power, and described target received power being divided into multiple rank;

Described calibration of power frame sending module, for sending the calibration of power frame comprising different target received power to described website, to make after the calibration of power frame comprising certain target received power sends, before the calibration of power frame that the next one comprises another target received power sends, described uplink transmission power is less than the website energy contention access channel of the maximum permission transmitted power of website.

19. access points according to claim 17, is characterized in that, described access point also comprises:

Packet parameters receiver module, for receiving the packet parameters that described website sends, and exports grouping module to, and described packet parameters comprises distance or the path loss that this website arrives described access point;

Grouping module, for dividing into groups to described website according to described distance or described path loss, arranging and only having one group of website access channel at every turn, and to each grouping and setting target received power;

20. access points according to claim 17, is characterized in that, described access point also comprises:

Grouping module, for when there being new site to be associated with this access point, the packet parameters according to described new site is divided into groups to described new site;

Calibration of power frame sending module, for calibrating frame to described new site transmitted power.

21. access points according to claim 17, is characterized in that, described access point also comprises:

Module is changed in grouping, for when detecting in this WLAN (wireless local area network) that having the packet parameters of website to change needs to change grouping, changes the grouping of described website, and sends grouping adjustment frame to described website, and described grouping adjustment frame comprises new packet number.

22. access points according to claim 17, is characterized in that, described access point also comprises:

Request transmission frame receiver module, for receiving the request transmission frame that described website sends, described request transmission frame comprises network allocation vector;

Channel idle can transmission frame sending module, for can transmission frame according to the described request transmission frame Return Channel free time, to ensure the transmitting uplink data of a certain grouping in time of indicating at described network allocation vector, described channel idle can comprise described network allocation vector by transmission frame.

23. 1 kinds of wireless lan communication systems, is characterized in that, comprise the access point according to any one of website according to any one of claim 12 to 16 and claim 17 to 22.