WO2013135115A1

WO2013135115A1 - Wlan communications device and wlan implementation method

Info

Publication number: WO2013135115A1
Application number: PCT/CN2013/070965
Authority: WO
Inventors: 张炜; 容荣
Original assignee: 华为技术有限公司
Priority date: 2012-03-12
Filing date: 2013-01-25
Publication date: 2013-09-19
Also published as: CN102624436A; CN102624436B

Abstract

The present invention applies to the field of communications and provides a WLAN communications device, and a WLAN implementation method and system. The WLAN communications device further comprises an antenna and control system; the antenna and control system comprises an antenna control logic unit, a switching network and an antenna array. The technical solution provided by the present invention has the advantage of achieving large coverage and high capacity at the same time.

Description

WLAN communication device and implementation method of WLAN

This application is submitted to the Chinese Patent Office on March 12, 2002. The application number is

2 01 2 1 006 356 1 . 7 . The invention is entitled " WLAN Communication Device and WLAN Implementation Method", the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a WLAN communication technology. Background technique

Wireless Local Area Network (WLAN) is currently widely used in home gateways and enterprise networks. Carrier-grade WLANs are now scaled to provide WLAN broadband services in outdoor areas for WLAN-enabled handsets or WLAN-enabled tablets.

Modern digital communication systems, including WLAN, use Orthogonal Frequency Division Multiplexing (OFDM) to help the system communicate in multipath reflection and/or strong interference environments. The receiver can choose to work in the increased capacity mode and / or increase the distance mode; the receiver may select two or more antennas to receive more than one subchannel in the OFDM channel; combining techniques such as maximum ratio combining may help to process carriers that receive symbol modulation from two or more antennas Finally, one OFDM symbol is generated; in other embodiments, more than one OFDM subchannel can be received by a single antenna, which is selected from a plurality of diverse antennas.

In the process of implementing the prior art, the prior art technical solution is found to have the following problems: The prior art technologies do not simultaneously solve the short-distance 802.11η Multiple Input Multiple Output (MIMO) downlink throughput optimization and The problem of 802.11 long-distance coverage cannot be large and covers a long distance. Summary of the invention

The purpose of the embodiments of the present invention is to provide a communication device for a WLAN, which aims to solve the problem that the capacity of the prior art solution is large and the coverage cannot be balanced.

In one aspect, the present invention provides a WLAN communication device, where the WLAN communication device includes: an antenna and a control system;

The antenna and the control system include: an antenna control logic unit, a switch network, and an antenna array;

The antenna control logic unit output terminal outputs a K channel control channel to the switch network, and an input end of the antenna control logic unit receives a radio frequency transmission TX or a receiving RX timing;

The switch network includes: a plurality of antenna sub-array switch networks, each antenna sub-array switch network includes: a plurality of switch components, a power splitter, and an antenna sub-array parasitic unit; the antenna array includes a plurality of antenna sub-arrays, wherein Each antenna sub-array comprises a plurality of antenna elements;

The plurality of switching components are all connected to the antenna control logic unit, and an output end of all antenna elements in the antenna sub-array passes through an input of the power divider and one of the plurality of switching components An output end of the one switch component is connected to a radio frequency signal corresponding to the antenna sub-array switch network; an input end of the other switch component of the plurality of switch components is connected to the corresponding radio frequency signal, the other The output ends of the switching components are respectively coupled to a plurality of antenna elements in the antenna sub-array.

A programmable logic, the programmable logic comprising:

The programmable logic output outputs a K-channel control channel to the switch network, and the input of the programmable logic receives the RF TX or RX timing.

A switch network, the switch network comprising:

a plurality of antenna sub-array switch networks, each antenna sub-array switch network comprising: a plurality of switch components and a power divider;

The plurality of switch components are all connected to an antenna control logic unit in the WLAN communication device, and outputs of all antenna elements in the antenna array in the WLAN communication device pass through the power splitter Connected to an input end of one of the plurality of switch components, an output end of the one switch component is connected to a radio frequency signal corresponding to the antenna sub-array switch network; and the other switch components of the plurality of switch components The input ends are all connected to the corresponding radio frequency signals, and the output ends of the other switch components are respectively connected to a plurality of antenna elements in the antenna sub-array corresponding to the antenna sub-array switch network in the WLAN communication device.

An antenna array, the antenna array comprising a plurality of antenna sub-arrays, wherein each antenna sub-array comprises a plurality of antenna elements, wherein the plurality of antenna elements pass the plurality of switching components and the radio frequency signals corresponding to the antenna sub-arrays connection.

A method for uplink transmission of a WLAN, where the method includes:

The WLAN access point AP identifies the type of the terminal, and sets the mode of the initial transmit antenna to a default transmit antenna combination. The default transmit antenna combination is: selecting one antenna from each antenna sub-array of multiple antenna sub-arrays of the antenna array. Array, the combination of selected antenna elements is the default transmit/receive antenna combination, where the distance between the selected antenna elements is greater than half wavelength or the polarization direction is different; when the 802.1 In terminal is identified, the WLAN AP uses the erroneous subframe The optimal throughput coding mode is selected for the equivalent throughput of sub per, wherein the equivalent throughput is N* subframe length / (1-sub per); the continuous multiple packet modulation coding mode is unchanged and the current antenna combination When it is the default transmit antenna combination, enter the transmit antenna selection mode; transmit antenna selection mode: For the 802.11n terminal, first identify the type of the terminal. If the 802.11n terminal supports 2 spatial streams, perform the antenna selection method of 2 spatial streams, otherwise execute Single spatial stream antenna selection method;

2 spatial stream antenna selection method specifically includes:

The WLAN AP scans and obtains multiple MIMO antenna combinations of the WLAN AP according to the modulation coding mode of the 2 spatial streams. The WLAN AP arbitrarily selects one MIMO antenna combination among multiple MIMO antenna combinations. Under the MIMO antenna combination, the WLAN AP receives a response ACK received by the terminal, and the RSSI is smaller than the default transmit antenna combination. The antenna combination switches to the next MIMO antenna combination and performs the operation mode of the next MIMO antenna combination. If the ACK RSSI is larger than the beam of the default transmit antenna combination, the sub per under the MIMO antenna combination is obtained, and then the next MIMO is switched. The antenna combines and performs the operation mode of the next MIMO antenna combination; the operation mode of the next MIMO antenna combination is: The WLAN AP receives the ACK RSSI returned by the terminal again under the next MIMO antenna combination, such as the ACK RSSI is smaller than the default transmit antenna Combining beams, switching the antenna combination to the next MIMO antenna combination, if the ACK RSSI is greater than the beam of the default transmit antenna combination, obtaining the sub per under the MIMO antenna combination, and then switching to the next MIMO antenna combination;

The WLAN AP repeatedly performs the operation mode of the next MIMO antenna combination until all combinations of multiple MIMO antenna combinations are completed;

The WLAN AP replaces the default transmit antenna combination with a MIMO antenna combination that selects a minimum subper value from a plurality of MIMO antenna combinations.

A method for uplink transmission of a WLAN, the method includes: when a WLAN access point AP receives a request sent by a terminal to send an RTS frame, and the terminal antenna combination has been selected, the receiving antenna combination is changed to a transmission of the terminal. Antenna combination, after receiving the RTS frame, switching the receiving antenna combination to the default receiving antenna combination;

When the WLAN AP receives the first MPDU subframe in the AMPDU sent by the terminal and the terminal transmitting antenna combination has been selected, the receiving antenna combination is changed to the transmitting antenna combination of the terminal;

RTS frame, cancel this switch.

In the embodiment of the present invention, the technical solution provided by the present invention can adjust the antenna combination arbitrarily to achieve the purpose of wide coverage distance and large capacity. DRAWINGS

1 is a structural diagram of a WLAN communication apparatus according to an embodiment of the present invention; FIG. 2 is a structural diagram of a WLAN communication apparatus according to an embodiment of the present invention;

3 is a structural diagram of a switch network according to an embodiment of the present invention;

4 is a structural diagram of an antenna array according to an embodiment of the present invention;

FIG. 5 is a structural diagram of an antenna element in an antenna array according to an embodiment of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that in this paper, there are antenna sub-arrays and antenna elements, which respectively represent different meanings. The antenna array is equivalent to one antenna, and the antenna sub-array is equivalent to one antenna, that is, one antenna sub-array can contain multiple Antenna array.

The present invention provides a WLAN communication device, as shown in FIG. 1, comprising: an N*M WLAN hardware platform 11, the WLAN communication device further comprising: an antenna and a control system 12;

The antenna and control system 12 includes: an antenna control logic unit 121, a switch network 122, and an antenna array 123;

The output of the antenna control logic unit 121 outputs an X-channel (X > 3) control signal to the switch network, and the input of the antenna control logic unit receives the RF TX or RX timing;

Wherein, the TX or RX timing is used to control whether the antenna array is in the transmitting mode or the receiving mode through the switch network, wherein the TX corresponds to the transmitting mode, and the RX corresponds to the receiving mode.

The switch network 122 includes: a plurality of antenna sub-array switch networks, each antenna sub-array switch network includes: a plurality of switch components, a power splitter, and an antenna sub-array parasitic unit; the antenna array 123 includes a plurality of antenna sub-arrays, each of which The antenna sub-arrays each comprise a plurality of antenna elements; In addition, optionally, the antenna sub-array switch network, the antenna sub-array, and the radio frequency signal may have a one-to-one correspondence; the antenna control logic unit 121 passes the bus interface (such as a local bus above 1 kbps) and the N*M WLAN hardware platform. CPU CPU connection within 11;

The plurality of switching components and the antenna sub-array parasitic unit are both connected to the antenna control logic unit 121, and the output ends of all the antenna elements in the antenna sub-array pass through the power splitter and the plurality of switch components An input end of a switch component is connected, an output end of the one switch component is connected to a radio frequency signal corresponding to the antenna sub-array switch network; and an input end of the other switch component of the plurality of switch components is corresponding to the corresponding radio frequency signal Connecting, the output ends of the other switch components are respectively connected to the plurality of antenna elements in the antenna sub-array;

Optionally, the beams formed by the plurality of antenna sub-arrays are combined into a coverage of 360° / J or an approximate value, where J is an integer.

It should be noted that, because the antenna array constitutes multiple beams, a wide range of coverage is formed, and in actual communication, the terminal type is distinguished, for example, the 802.11n terminal selects a wide coverage mode to increase the capacity (refer to the method embodiment for a specific selection manner). Description), for the 802.11g terminal to select a short coverage method to increase the distance, thus achieving compatibility with distance and capacity. The wide coverage mode has a large beam width, and the short coverage method has a short beam width, so the coverage distance is long.

Optionally, the switch components are: a pin tube, a radio frequency switch, a triode, or a microelectronic mechanics switch (MEMS).

Optionally, the switch network further includes: a reflector, wherein the switch component is disposed in the reflector, and the switch of the switch component is capable of adjusting an effective working length of the reflector.

It should be noted that the antenna control logic unit 121 may be embedded in the N*M WLAN hardware platform 11, for example, embedded in the CPU or hardware MAC+BB+RF. Of course, the antenna control logic unit may also be a physical device. For example CPLD.

The WLAN communication device provided by the present invention can select the rate selection mode and the antenna selection mode of the following method by using the improved antenna control system, thereby providing downlink capacity optimization for MIMO users and coverage distance optimization for 802.11 users to implement WLAN communication. The capacity of the device is large Covering the distance.

In another aspect, the present invention also provides a programmable logic, the programmable logic comprising:

The programmable logic is connected to the CPU in the N*M WLAN hardware platform through a bus interface (such as a local bus above lkbps), and the programmable logic output outputs an X-channel control signal to the switch network, and the input end of the programmable logic Receive RF TX or RX timing.

In still another aspect, the present invention provides a switch network, the switch network comprising:

a plurality of antenna sub-array switch networks, each antenna sub-array switch network comprising: a plurality of switch components, a power divider, and an antenna sub-array parasitic unit;

The plurality of switch components and the antenna sub-array parasitic unit are both connected to an antenna control logic unit in a WLAN communication device, and outputs of all antenna elements in the antenna sub-array in the WLAN communication device pass the work An input end of one of the plurality of switch components and an input end of the other of the plurality of switch components are connected to the corresponding radio frequency signal, and an output end of the other switch component And respectively connected to a plurality of antenna elements in the antenna sub-array corresponding to the antenna sub-array switch network in the WLAN communication device.

In one aspect, the present invention provides an antenna array, where the antenna array includes a plurality of antenna sub-arrays, wherein each antenna sub-array includes a plurality of antenna elements, wherein the plurality of antenna elements pass through the switch network and the antenna The radio frequency signal connection corresponding to the sub-array;

The present invention provides an embodiment of the present invention. The communication device may be: an external WLAN access point (Access Point, AP), and the structure diagram of the WLAN AP is as shown in FIG. The foregoing AP is described by taking an example of three radio frequency signals (RFs), and the WLAN AP includes:

An antenna control system 21 and an N*M WLAN hardware platform 22, wherein N is an integer greater than or equal to 2, and M is an integer greater than or equal to 1; The antenna control system 21 includes: a Programmable Logic Device (CPLD) 211, a switch network 212, and an antenna array 213;

The N*M WLAN hardware platform 22 specifically includes: a central processing unit CPU221, hardware MAC+BB+RF 222, and an RF switch 223;

The CPU 221 is connected to the hardware MAC+BB+RF 222; the first output end of the hardware MAC+BB+RF 222 is connected to the first RF switch 223 through the TX link chain, and the first receiving end of the hardware MAC+BB+RF 222 passes. The RX chain is connected to the first RF switch 223; the second output of the hardware MAC+BB+RF 222 is connected to the second RF switch 223 via the TX chain, and the second receiving end of the hardware MAC+BB+RF 222 is passed through the RX chain and the The second RF output of the hardware MAC+BB+RF 222 is connected to the third RF switch 223 through the TX chain, and the third receiving end of the hardware MAC+BB+RF 222 passes through the RX chain and the third RF switch 223. Connection; Hardware MAC+BB+RF 222 is used to send (TX, Transmitter) or Receive (RX, receiver) timing to logic 211.

The RF switch 223 (including the first, second, and third) is connected to the switch network 212;

The CPU 221 is connected to the CPLD 211 through a bus interface of 1 kbps or more, such as a local bus, and the CPLD 211 is specifically configured to transmit a control signal to control the switch network, thereby changing the antenna combination actually working.

It should be noted that the N*M WLAN hardware platform 22 belongs to the prior art, and is not described here. The detailed description of the structure and the operating state of the antenna control system 21 is required. The following describes the antenna control by taking each component as an example. The structural composition of system 21.

The change of CPLD211 is mainly the change of input and output. The output of CPLD211 outputs N (N > 3) control signal to switch network 212, and the input of CPLD211 receives RF TX or RX timing; In addition, the input and output of CPLD211 The terminal is also connected to the CPU 221 via a bus interface above lkbps, such as a local bus.

It should be noted that the bus interface above lkbps, such as the local bus, transmits a signal to the mode of transmitting or receiving the antenna, and triggers the antenna and the receiving mode to change. CPLD changes the two modes of storage. The bus interface above lkbps, such as local bus, can be replaced with other communication interfaces, such as media independent interface (ΜΠ, Media independent interface), serial Gbit media independent interface (SGMII, Serial Gigabit). Media independent interface), serial port (COM), PCI (Peripheral component interface), PCIe (Peripheral component interface express), etc. Tx or Rx uses the transmit and receive timing as the logic input to control the GPIO output. The transmit and receive timings can be: the transmit level is high and the receive level is low; of course, the transmit level is low. The receiving level is high. Localbus is passed as a regular interface in the industry. The conventional WLAN chip can output Tx/Rx timing, and the timing of the output meets the requirements of the 802.11 standard, that is, the TX interval RX and the RX interval Tx, wherein the interval is smaller than the standard slot time (normally 9us).

The Tx timing can be replaced by the transmit and receive ACK timings, and the receive timing can be replaced by the receive data and the transmit ACK timing.

The switch network 212 is a newly designed switch network. For the convenience of description, the antenna array here is exemplified by two antenna sub-arrays. In actual situations, there may be other numbers, such as 3, 4, 5, etc., the switch network. The hardware structure of 212 is shown in Figure 3.

The switch network 212 includes: an antenna sub-array 1 switch network 31 and an antenna sub-array 2 switch network 32; wherein the antenna sub-array 1 switch network 31 includes:

The first pin tube 311, the second pin tube 311, the third pin tube 311, the power divider 312, and the antenna sub-array 1 parasitic unit 313; wherein, the input ends of the first pin tube 311 and the third pin tube 311 are input 1 way The RF signal, the output ends of the first pin tube 311 and the third pin tube 311 are respectively connected to the antenna sub-array 1 and the antenna sub-array 1 . The output ends of the antenna sub-array 1 and the antenna sub-array 2 are connected to the input end of the second pin tube 311 through the power splitter 312, and the output end of the second pin tube 311 outputs one RF signal (note that The RF signal here only indicates that the type of the transmitted signal is the same as the signal type of the input of the first pin tube and the third pm tube, and the information carried in the RF signal is different); the first pin tube 311, the second pin tube The third pin tube 311 and the antenna sub-array 1 are connected to the CPLD 211 and are controlled by the CPLD 211. For details, refer to the following WLAN implementation method, which is not described here.

The hardware structure and connection relationship of the antenna sub-array 2 switch network 32 are basically the same as those of the antenna sub-array 1 switch network 31. The only difference is that the input or output of the pin tube is 2 RF signals, and the parasitic The unit is a parasitic unit of the antenna sub-array 2. The specific structure can be seen in FIG. 3, and details are not described herein.

In addition, it should be noted that the pin tube in the switch network can also be replaced by a radio frequency switch or a triode, at the cost of high cost. Of course, the Pin tube can also be replaced by a mechanical switch, which is to control the system output as a mechanical action, not an electrical signal. The cost can be low and the mechanical process is very high.

The antenna array is a completely new design. The antenna array in this embodiment is exemplified by three antenna sub-arrays. In actual situations, other antenna sub-arrays may be included, for example, antennas including 2, 4, and 5 are included. Subarray. The structure of the antenna array is shown in Figure 4, including:

The antenna sub-array 1, the antenna sub-array 2, and the antenna sub-array 3, wherein the antenna sub-array 1, the antenna sub-array 2, and the antenna sub-array 3 respectively have one RF signal (RF1), one RF signal (RF2), and three channels. RF signal (RF3) connection;

The structure of the three antenna sub-arrays is identical. Here, the antenna sub-array 1 is taken as an example to illustrate the antenna sub-array structure. The antenna sub-array 1 includes: a pin tube 311 and an antenna element 42; wherein the first antenna element 42 and the second antenna element 42 are symmetrically distributed; RF1 is connected to the first antenna element 42 and the second antenna element 42 through two pin tubes 311, respectively. The pin tube 311 is controlled by a control system. Wherein, the change of the logic output pin voltage affects the on and off of the pin tube; in addition, the pin tube may also be configured with a parasitic unit. It should be noted that each RF corresponds to one or more antenna elements, wherein the parasitic unit is configurable. The beam width and direction of the antenna array can be varied. This change is achieved by the state change of the parasitic element. When the parasitic element is disabled, the single RF forming beam cannot constitute 360. /J or approximation coverage, 3 RF (2, 4, 5, 6, etc. in the implementation) to form the presence or approximation of the beam combination (the direction difference does not exceed 3db). When the parasitic element is enabled, the single RF forming beam does not constitute a 360° / J or approximate coverage.

It should be noted that, from the perspective of the trace requirements, the RF signal is required to pass through the pin tube to the same distance as the antenna array that is controlled to be turned on and off. The above traces can also be deliberately designed to different lengths so that a fixed delay of the RF signal is stroked at the exits of the plurality of RFs to increase phase diversity.

In addition, it should be noted that the antenna sub-array may also include other numbers of antenna elements, for example, as shown in FIG. 5, including four antenna elements, which are different from the antenna sub-array in FIG. 4 only in each antenna. The beamwidth covered by the array is 90. /J (The beam width covered by each antenna element in Fig. 4 is 180. /J), and the connection manner of a single antenna element is the same as that of Fig. 4, and will not be described here.

It should be noted that 4 layers can be printed on one horizontal panel, or can be printed on 2 or 4 sides of a cube. The other 4 channels of 2 RF are recorded as intersecting 90 degrees. Of course, A directional depiction of a half-wavelength distance from a working frequency such as 2.4G.

The four structural forms of the three RF antenna components are given below:

Structure 1: For the sub-array of the planar antenna, a three-RF implementation is that the three RF-corresponding antenna sub-arrays are in the same horizontal plane to form a three-area planar antenna.

Structure 2: For a sub-array of a planar antenna, a three-RF implementation is that two RF-corresponding antenna sub-arrays are in the same horizontal plane, and an antenna is vertically drawn at each of the array positions of one RF-corresponding antenna sub-array to form an antenna. Double-sided area antenna.

Structure 3: For a 2-sided antenna sub-array of cubes, a three-RF implementation is to form a hexahedral antenna.

Structure 4: For a 2-sided antenna sub-array of a cube, a three-RF implementation is to form a 4-sided cube antenna in which an array of RF-corresponding sub-arrays is vertically depicted on a matrix of another RF-corresponding sub-array. The present invention provides another embodiment. This embodiment provides a WLAN AP antenna selection method, which is divided into an uplink direction and a downlink direction. It should be noted that the methods provided in this embodiment are all the WLAN devices in the foregoing embodiments. To complete, where the WLAN device may be a WLAN AP. For the downlink direction, the type of the terminal is first identified, and the mode of the initial transmit antenna is the default transmit antenna combination. The default transmit antenna combination is that the default transmit antenna combination selects one antenna array from each antenna sub-array of the antenna array, by disabling parasitic The unit is configured to combine the default transmit antennas into a 360/J overlay. Each selected antenna element is separated by more than half a wavelength or a different polarization direction. For example, selecting the antenna sub-array 1 from the antenna sub-array 1 and disabling the parasitic unit, and selecting the antenna sub-array 2 from the antenna sub-array 2 And disabling the parasitic unit, selecting the antenna sub-array 3 from the antenna sub-array 3 and disabling the parasitic unit; the combination of the antenna sub-array 1, the antenna sub-array 2, and the antenna sub-array 1 As a default combination, of course, depending on the location of the configurable parasitic unit, there are other options.

There are three mode selection modes in the downlink direction of the WLAN AP, which are: rate selection mode, transmit antenna selection mode, and power control mode. The differences between the three modes are described in detail below. It should be noted that the specific control of the above three mode selections The mode sends the K-channel control signal to the switch network through the programmable control logic, so that the switch network controls the antenna array to form different antenna combinations to achieve the advantages of large capacity and large coverage. In the rate selection mode, for the 802.1 In terminal, the WLAN AP selects the optimal modulation and coding mode by using the equivalent throughput corresponding to the sub-sub-subrate (subper). For the 802.11g terminal, the WLAN AP uses the total frame error rate (total per). Optimal modulation and decoding method. It should be noted that, in the aggregated mac packet data unit (AMPUD), sub per may be the ratio of the number of lost subframes in an aggregated frame to the total number of subframes in the aggregated frame; if AMPUD is not enabled, the statistical history is 10 ( It can also be the number of sub-frames lost by other numbers, for example, 11 or 12 subframes. The following is a practical example to describe the calculation method of sub per, taking an aggregate frame of 10 (or other values) as an example. If 3 subframes are lost, sub per=3/10*100%=30%; the equivalent throughput is N* subframe length / (1-sub per). When the speed selection mode is stable (the continuous 5 packet modulation coding modes are unchanged) and the current antenna combination is the default transmit antenna combination, the transmit antenna selection mode is entered; the transmit antenna selection mode: For the 802.1 lg terminal, the WLAN AP is based on the above modulation and demodulation The mode scan obtains multiple non-MIMO antenna combinations of the WLAN AP; (the non-MIMO antenna combination specifically includes: selecting one antenna element from each antenna sub-array of the antenna array, each selected antenna element having the strongest radiation or the same polarization direction ).

The WLAN AP arbitrarily selects a non-MIMO antenna combination among a plurality of non-MIMO antenna combinations. Under the non-MIMO antenna combination, the WLAN AP receives a response signal strength (ACK) returned by the terminal. RSSI), if the ACK RSSI is smaller than the beam of the default transmit antenna combination, switching the antenna combination to the next non-MIMO antenna combination and performing the operation mode of the next non-MIMO antenna combination, if the ACK RSSI is larger than the beam of the default transmit antenna combination, Obtaining a multiple (for example, 10 times, of course, 9 times) frame error rate (per) under the non-MIMO antenna combination, and then switching to the next non-MIMO antenna combination and performing the next non-MIMO antenna combination Mode of operation. The operation mode of the next non-MIMO antenna combination may be: The WLAN AP receives the ACK RSSI returned by the terminal again under the next non-MIMO antenna combination, for example, the ACK RSSI is smaller than the beam of the default transmit antenna combination, and the antenna combination is switched to the next. A non-MIMO antenna combination, if the ACK RSSI is larger than the beam of the default transmit antenna combination, acquires the multiple of the non-MIMO antenna combination, and then switches to the next non-MIMO antenna combination.

The WLAN AP repeatedly performs the operation mode of the next non-MIMO antenna combination until all non-MIMO antenna combinations are switched.

The WLAN AP selects a non-MIMO antenna combination of a minimum per value from a plurality of non-MIMO antenna combinations to replace the default transmit antenna combination. At this time, when the antenna combination is selected, a special case may occur. The special case is as follows: The per-value of the multiple non-MIMO antenna combinations is 0. In this case, the WLAN AP needs to increase the rate (MCS). A grade (typically 5%, of course, can also be other values) obtains the per value of a plurality of non-MIMO antenna combinations in the method selected by the above antenna. For the 802.11n terminal, the type of the terminal is first identified. If the 802.11n terminal supports 2 spatial streams (see the description of the 802.11 standard for the specific specification of the spatial stream), the antenna selection method of the 2 spatial stream is performed, otherwise the single spatial stream is executed. Antenna selection method.

The spatial stream antenna selection method may specifically include:

The WLAN AP scans and obtains multiple MIMO antenna combinations of the WLAN AP according to the modulation scheme of the 2-space stream. (One antenna array is selected for each antenna sub-array in the antenna combination, and the radiation of each antenna array is the strongest or the polarization direction is different) . The WLAN AP arbitrarily selects one MIMO antenna combination among multiple MIMO antenna combinations. Under the MIMO antenna combination, the WLAN AP receives the ACK RSSI returned by the terminal, such as the ACK RSSI is smaller than the beam of the default transmit antenna combination, and switches the antenna combination to The next MIMO antenna combines and performs the operation mode of the next MIMO antenna combination. If the ACK RSSI is larger than the beam of the default transmit antenna combination, the err subframe rate (sub per ) of the MIMO antenna combination is obtained, and then the next switch is made. A MIMO antenna combines and performs an operational mode of the next MIMO antenna combination. The operation mode of the next MIMO antenna combination may be: The WLAN AP receives the ACK RSSI returned by the terminal again under the next MIMO antenna combination, such as the ACK RSSI is smaller than the beam of the default transmit antenna combination, and switches the antenna combination to the next MIMO. The antenna combination, if the ACK RSSI is larger than the beam of the default transmit antenna combination, acquires the multiple of the non-MIMO antenna combination, and then switches to the next MIMO antenna combination.

The WLAN AP repeatedly performs the operation mode of the next MIMO antenna combination until all of the MIMO antenna combinations are switched.

The WLAN AP selects the most d, per value MIMO antenna combination from a plurality of MIMO antenna combinations to replace the default transmit antenna combination. At this time, when the antenna combination is selected, a special case may occur. The special case at this time is the same as the feature of the non-MIMO antenna combination in 802. l lg, and the processing manner is the same, and will not be described here. The antenna selection method for a single spatial stream may specifically include:

The WLAN AP scans the MIMO AP's optimal antenna combination according to the modulation and coding mode of the single spatial stream (the antenna combination may be: physically identical or adjacent non-MIMO antenna combinations);

The WLAN AP arbitrarily selects one antenna combination in the MIMO antenna combination. Under the antenna combination, the WLAN AP receives the ACK RSSI returned by the terminal, such as the ACK RSSI is smaller than the beam of the default transmit antenna combination, and switches the default transmit antenna combination to another antenna combination. , if ACK RSSI is greater than the default Transmitting the combined antenna beam, obtaining the frame error rate of the antenna combination multiple times (for example, 10 times, of course, 9 times, etc.), and then switching to another antenna combination. Under another antenna combination, the WLAN AP is again The ACK RSSI returned by the receiving terminal, such as the ACK RSSI is smaller than the beam of the default transmitting antenna combination, switches the antenna combination to the previous antenna combination, and if the ACK RSSI is larger than the beam of the default transmitting antenna combination, the sub per is obtained under the antenna combination. If the two-stream optimal antenna combination has a sub per value, the WLAN AP selects the antenna combination of the smallest sub per value from the two-stream optimal antenna combination to replace the default transmit antenna combination. After the antenna selection of the WLAN AP is stabilized, the rate selection mode is entered again. At this time, the default transmit antenna combination in the rate selection mode needs to be replaced with the antenna combination selected in the transmit antenna selection mode. Of course, in actual applications, there may be a sudden change, for example, the terminal suddenly moves the position, and the method for detecting the sudden change may be that when the WLAN AP receives the ACK RSSI mutation sent by the terminal and the throughput is also abrupt, it is determined that the mutation occurs. In the case of this mutation, the WLAN AP first waits for the rate to be fixed and then re-triggers the transmit antenna selection mode (see the description above for specific operation methods). In addition, the above criteria for determining the ACK RSSI mutation may be: The first 10 (may be other numbers, for example, 9) ACK RSSI and the following 10 (may also be other numbers, but need to compare with the number of previous ACK RSSI Corresponding) ACK RSSI differs by 3db. The above criteria for determining the throughput mutation can be: The first 10 (adjustable) packet throughput and the subsequent 10 (adjustable, but need to correspond to the number of previous bread) The packet throughput differs by 10% (this value is adjustable) Value).

The WLAN AP enters the power control mode when the rate is stable in the rate selection mode and the current transmit antenna combination is not the default transmit antenna combination. Power control mode: The WLAN AP performs downlink power control according to the transmit antenna mode, the ACK RSSL receive antenna mode sent by the receiving terminal, the terminal transmit power (user preset), the terminal antenna gain (user preset), and the terminal receive sensitivity conventional value. The specific method of power control is the prior art The method is not described in detail in this application. Uplink direction: When the WLAN AP receives the request to send (RTS) frame sent by the terminal and the terminal transmit antenna combination has been selected, the receiving antenna combination is changed to the transmitting antenna combination of the terminal, after the RTS frame is received, Switching the receiving antenna combination to the default receiving antenna combination, that is, selecting a power splitter from a plurality of antenna sub-arrays of the antenna array and combining all the arrays, for example, selecting an antenna sub-array from the antenna sub-array 1 2. The power splitters of the array 3 and the array 4 are combined, and the power splitters of the antenna sub-array 2, the array 2, the array 3, and the array 4 are selected from the antenna sub-array 2, and the antenna sub-array is selected from the antenna sub-array 3 The power splitters of the array 3, the array 2, the array 3, and the array 4 are merged; that is, the default receiving antenna combination. It should be noted that the switching of the receiving antenna combination needs to be completed within 1 ms, of course, preferably in one slot (ie, 9 μ 8 ). When the WLAN AP receives the first MPDU subframe in the AMPDU sent by the terminal and the terminal transmit antenna combination has been selected, the receiving antenna combination is changed to the transmitting antenna combination of the terminal; when the WLAN cancels the current switching. In addition, the optimal switching time of the receiving antenna combination can be 8 bytes transmission time, and the maximum tolerance switching time can be lms. The method provided by the invention can reach a defect with a large coverage and a high capacity through rate selection and antenna selection.

In the above unit and system embodiment, each module or unit included is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be realized; in addition, the specific name of each functional module is also They are only used to facilitate mutual differentiation and are not intended to limit the scope of the present invention.

Those skilled in the art can understand that all or part of the technical solutions provided by the embodiments of the present invention can be completed by using related hardware of program instructions. For example, it can be done by computer running. The program can be stored on a readable storage medium such as a random access memory, a magnetic disk, an optical disk, or the like.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Claim

A WLAN communication device, characterized in that: the WLAN communication device comprises: an antenna and a control system;

2. Apparatus according to claim 1 wherein the beams formed by said plurality of antenna sub-arrays are combined to have a 360[deg.]/J coverage, wherein J is an integer.

3. Apparatus according to claim 1 wherein said switch network comprises: a reflector, wherein said switch component is disposed within the reflector, and wherein said switch component switch is capable of adjusting the effective operation of the reflector length.

4. A programmable logic, wherein the programmable logic comprises:

5. A switch network, wherein the switch network comprises: a plurality of antenna sub-array switch networks, each antenna sub-array switch network comprising: a plurality of switch components and a power splitter;

The plurality of switch components are all connected to an antenna control logic unit in the WLAN communication device, and an output end of all antenna elements in the antenna sub-array in the WLAN communication device passes through the power splitter and the plurality of switches An input end of one of the switch components is connected, an output end of the one switch component is connected to a radio frequency signal corresponding to the antenna sub-array switch network; and an input end of the other switch component of the plurality of switch components is Corresponding radio frequency signal connections are formed, and the output ends of the other switch components are respectively connected to a plurality of antenna elements in the antenna sub-array corresponding to the antenna sub-array switch network in the WLAN communication device.

6. The switching network of claim 5, wherein the switching component is: a pin tube, a radio frequency switch, a triode, or a MEMS switch.

The switch network according to claim 5 or 6, wherein the switch network comprises: a reflector, wherein the switch component is disposed in the reflector, and the switch of the switch component is capable of adjusting the reflector Effective working length.

8. An antenna array, characterized in that

The antenna array includes a plurality of antenna sub-arrays, wherein each antenna sub-array includes a plurality of antenna elements, wherein the plurality of antenna elements are connected to the radio frequency signals corresponding to the antenna sub-arrays through a plurality of switching components.

9. The antenna array of claim 8 wherein:

The beams formed by the plurality of antenna sub-arrays are combined into 360° / J, where J is an integer.

A method for uplink transmission of a WLAN, the method comprising:

The WLAN access point AP identifies the type of the terminal, and sets the mode of the initial transmit antenna to a default transmit antenna combination. The default transmit antenna combination is: selecting one antenna from each antenna sub-array of multiple antenna sub-arrays of the antenna array. Array, the combination of selected antenna elements is the default transmit antenna combination, wherein the distance between the selected antenna elements is greater than half wavelength or the polarization direction is different; When the 802.1 In terminal is identified, the WLAN AP selects an optimal modulation and coding mode by using an equivalent throughput corresponding to the erroneous subframe rate sub per, where the equivalent throughput is N* subframe length / (1-sub per); When multiple consecutive packet modulation coding modes are unchanged and the current antenna combination is the default transmit antenna combination, the transmit antenna selection mode is entered; the transmit antenna selection mode: For the 802.11n terminal, the terminal type is first identified, if the 802.11n terminal supports 2 spaces Flow, then perform antenna selection method of 2 spatial streams, otherwise perform single spatial stream antenna selection method;

2 spatial stream antenna selection method specifically includes:

The WLAN 扫描 scans a plurality of ΜΙΜΟ antenna combinations of the WLAN ΑΡ according to the modulation coding method corresponding to the 2 spatial streams;

The WLAN AP arbitrarily selects one MIMO antenna combination among multiple MIMO antenna combinations. Under the MIMO antenna combination, the WLAN AP receives a response ACK received by the terminal, and the RSSI is smaller than the default transmit antenna combination. The antenna combination switches to the next MIMO antenna combination and performs the operation mode of the next MIMO antenna combination. If the ACK RSSI is larger than the beam of the default transmit antenna combination, the sub per under the MIMO antenna combination is obtained, and then the next MIMO is switched. The antenna combines and performs the operation mode of the next MIMO antenna combination; the operation mode of the next MIMO antenna combination is: The WLAN AP receives the ACK RSSI returned by the terminal again under the next MIMO antenna combination, such as the ACK RSSI is smaller than the default transmit antenna Combining beams, switching the antenna combination to the next MIMO antenna combination, if the ACK RSSI is greater than the beam of the default transmit antenna combination, obtaining the sub per under the MIMO antenna combination, and then switching to the next MIMO antenna combination;

The WLAN AP repeatedly performs the operation mode of the next MIMO antenna combination until all the MIMO antenna combinations are completely switched; The WLAN AP replaces the default transmit antenna combination with a MIMO antenna combination that selects a minimum sub per value from a plurality of MIMO antenna combinations.

The method according to claim 10, wherein the transmitting antenna selection mode further comprises: for the 802.11g terminal, the WLAN AP scans the WLAN AP based on the modulation and demodulation manner to obtain multiple non-multiple-input multiple-output MIMO antennas of the WLAN AP. Combining MIMO antenna combination, in the non-MIMO antenna combination, the WLAN AP receives the ACK RSSI returned by the terminal, such as the ACK RSSI is smaller than the beam of the default transmit antenna combination, switches the antenna combination to the next non-MIMO antenna combination and performs the next The operation mode of the non-MIMO antenna combination, if the ACK RSSI is larger than the beam of the default transmit antenna combination, obtain the multiple frame error rate per under the non-MIMO antenna combination, and then switch to the next non-MIMO antenna combination and execute the next The operation mode of the non-MIMO antenna combination is: the operation mode of the next non-MIMO antenna combination is: the WLAN AP receives the ACK RSSI returned by the terminal again under the next non-MIMO antenna combination, such as the ACK RSSI is smaller than the default transmit antenna combination. Beam, switching the antenna combination to the next non-MIMO antenna combination, if the ACK RSSI is greater than the default transmit antenna group Combining the beam, obtaining the frame error rate per under the non-MIMO antenna combination, and then switching to the next non-MIMO antenna combination;

The WLAN AP repeatedly performs the operation mode of the next non-MIMO antenna combination until all the non-MIMO antenna combinations are completely switched;

The WLAN AP selects a non-MIMO antenna combination of a minimum per value from a plurality of non-MIMO antenna combinations to replace the default transmit antenna combination.

The method according to claim 10 or 11, wherein the method further comprises:

The WLAN AP enters the power control mode when the rate is stable in the rate selection mode and the current transmit antenna combination is not the default transmit antenna combination;

Power control mode: The WLAN AP according to the transmit antenna mode, the ACK RSSI sent by the receiving terminal, The downlink power control is performed on the receiving antenna mode, the terminal transmitting power, the terminal antenna gain, and the terminal receiving sensitivity conventional value.

A WLAN uplink transmission method, the method includes: when a WLAN access point AP receives a request sent by a terminal to send an RTS frame, and the terminal transmit antenna combination has been selected, the receiving antenna combination is used. Changing to the transmit antenna combination of the terminal, after receiving the RTS frame, switching the receive antenna combination to the default receive antenna combination;

RTS frame, cancel this switch.