CN100550800C - Wireless communications method and equipment - Google Patents

Abstract

Wireless Telecom Equipment comprises judges whether first channel satisfies the carrier sense device of the specified conditions of judging idle condition, with when the certain conditions of judging idle condition satisfies, carry out control and will be taken first frame of first scheduled time slot by virtual carrier sensing in wireless network communication, and carry out control and will be taken the taking/release control device of second frame of second scheduled time slot by virtual carrier sensing in wireless network communication so that the second physical layer protocol processing unit produces and transmit the statement second channel so that the first physical layer protocol processing unit produces and transmit statement first channel.

Description

Wireless communications method and equipment

Technical field

The present invention relates to carry out the wireless communications method and the equipment of medium access control based on the carrier sense state.

Background technology

Medium access control (MAC) is that how the multiple communication equipment decision of executive communication uses media and the control carried out when making shared identical media in the process that transmits communication data.Because medium access control, even two or more communication equipment use same media to transmit communication data simultaneously, the communication equipment that also can reduce receiver side can not separate the possibility that the conflict of communication data takes place.No matter whether there is the communication equipment with the request of transmission, medium access control has reduced the chance that media is not used by any communication equipment equally.

In radio communication, because communication equipment is difficult to monitor the transmission of these data when transmitting data, just needing is not the medium access control of prerequisite with the collision detection.Utilized the technology of the carrier sense multiple access (CSMA/CA, Carrier Sense Multiple Access withCollision Avoidance) of the generation that avoids conflict as the IEEE 802.11 of the typical technical standard of WLAN (wireless local area network) (LANs).

According to the CSMA/CA among the IEEE 802.11, in the head of mac frame, be provided with period (being called as the duration) up to the EOS of forming by the single or multiple frame exchanges that follow mac frame closely.In this duration, irrelevant and communication equipment that do not have transmission right wait transmission when determining the virtual seizure condition of media with this sequence.Can prevent conflict like this.On the other hand, having the communication equipment that transmits right in this sequence identifies except media and is not used by media the actual period that takies.

IEEE 802.11 definition, the state of media are based on determining as the virtual carrier sensing in wireless network communication on the MAC layer of last situation with as the combination that the physical carrier on the physical layer of back one situation is intercepted, and medium access control is determined to be performed according to this.

Japanese Patent Application Publication communique 2003-87856 discloses the method that realizes the wireless base station, and this wireless base station can exist in the multiple WLAN local area network (LAN) scheme in the wireless communication system of the multiple WLAN scheme with different physical layers shared therein.More specifically, make the wireless base station alternately produce first notification signal on first physical layer and second notification signal on second physical layer and transfer them to wireless terminal, and first and second physical layers and first and second notification signals switch synchronously.Wireless terminal corresponding to first physical layer only is allowed to visit in the scheduled time slot of first notification signal after the delivery time, and only is allowed to visit corresponding to the wireless terminal of second physical layer in the scheduled time slot of second notification signal after the delivery time.

Utilize the IEEE 802.11 of CSMA/CA to attempt main by changing physical-layer techniques raising communication speed.For the 2.4GHz frequency band, (build on 1997, traffic rate=2Mbps) changes to IEEE 802.11b and (builds on 1999, traffic rate=11Mbps) from IEEE 802.11, and further change to IEEE 802.11g and (build on 2003, traffic rate=54Mbps).For the 5GHz frequency band, only exist IEEE 802.11a (to build on 1999, traffic rate=54Mbps) as standard criterion.

In order to develop the standard criterion of the communication speed that is intended to further to increase 2.4GHz and two frequency bands of 5GHz, set up IEEE 802.11TGn (Task Group n).In the new standard of exploitation, when using the frequency band identical, importantly guarantee to coexist with the communication equipment that meets existing standard with existing standard (IEEE802.11b/g/a).In addition, preferably has back compatible.Owing to this reason, be to accord with the CSMA/CA that matches with existing standard to the basic demand of the agreement on the MAC layer.

As the approach that increases communication speed, can obtain increasing the method for the frequency band of channel.If new standard is used the frequency band be not used, can not coexist and the problem of back compatible.According to Japanese Patent Application Publication communique 2003-87856, although be that first and second physical layers have been set different frequency bands, there is not frequency overlap between each frequency band, as for example 4.9 to 5GHz and 5.03 arriving 5.09GHz.Yet because frequency is a precious resources, the new channel with new frequency band preferably is assigned to the frequency band that has been used.For example, make a new channel comprise that a plurality of existing channels are being effective aspect the increase frequency service efficiency.

Like this, in order to make communication equipment that accords with new criteria and the communication equipment that accords with existing standard keep coexistence and back compatible, when using new channel to communicate, be necessary not only new channel to be carried out medium access control, and existing channel carried out medium access control by the method that the communication equipment that can be accorded with existing standard is understood.But conventional CSMA/CA is designed a channel is carried out access control, therefore can not be to having a plurality of channels execution medium access control that different frequency bandwidth and frequency overlap.

Summary of the invention

The object of the invention provides wireless communications method and the equipment that can carry out medium access control to a plurality of channels with the different frequency bandwidth that is present in the same frequency spectrum.

A kind of Wireless Telecom Equipment is provided according to a first aspect of the invention, this Wireless Telecom Equipment comprises the first physical layer protocol processing unit that is configured to the radio communication of utilizing at least one first channel with first frequency band is carried out the physical layer protocol processing, the radio communication that is configured to utilization is had the second channel of second frequency band that bandwidth overlaps greater than first frequency band and with first frequency band is carried out the second physical layer protocol processing unit that physical layer protocol is handled, be configured to manage the carrier sense state of first channel and judge whether first channel satisfies the condition managing device of the certain conditions of judging idle condition, and be configured to carry out control when indication first channel satisfies the result of determination of the certain conditions of judging idle condition and produce statement first channel and will be taken first frame of first scheduled time slot receiving, and make the first physical layer protocol processing unit transmit the first control device of this first frame by virtual carrier sensing in wireless network communication from the condition managing device.

A kind of Wireless Telecom Equipment is provided according to a second aspect of the invention, except according to being configured to of the Wireless Telecom Equipment of first aspect, this Wireless Telecom Equipment also comprises and is configured to carry out control and produces the statement second channel and will be taken second frame of second scheduled time slot by virtual carrier sensing in wireless network communication, and makes the second physical layer protocol processing unit transmit the second control device of this second frame.

A kind of Wireless Telecom Equipment is provided according to a third aspect of the invention we, except according to being configured to of the Wireless Telecom Equipment of first aspect, this Wireless Telecom Equipment also comprises and is configured to carry out control and produces second frame that discharges second channel by virtual carrier sensing in wireless network communication, and makes the second physical layer protocol processing unit transmit the second control device of this second frame.

A kind of wireless communications method is provided according to a forth aspect of the invention, this method comprises management, and at least one has the carrier sense state of first channel of first frequency band, whether satisfy the certain conditions of judging idle condition with judgement first channel, and when first channel satisfies the certain conditions of judging idle condition, produce statement first channel and will be taken first frame of first scheduled time slot, and transmit this first frame by first channel by virtual carrier sensing in wireless network communication.

A kind of wireless communications method is provided according to a fifth aspect of the invention, this method comprises management, and at least one has the carrier sense state of first channel of first frequency band, whether satisfy the certain conditions of judging idle condition with judgement first channel, and generation statement first letter is logical when first channel satisfies the certain conditions of judging idle condition will be taken first frame of first scheduled time slot by virtual carrier sensing in wireless network communication, and transmit this first frame by first channel, and produce second channel that statement has second frequency band that bandwidth overlaps greater than first frequency band and with first frequency band by will being taken second frame of second scheduled time slot, and transmit this second frame by second channel by virtual carrier sensing in wireless network communication.

A kind of wireless communications method is provided according to a sixth aspect of the invention, this method comprises management, and at least one has the carrier sense state of first channel of first frequency band, whether satisfy the certain conditions of judging idle condition with judgement first channel, and when first channel satisfies the certain conditions of judging idle condition, produce statement first channel and will be taken first frame of first scheduled time slot by virtual carrier sensing in wireless network communication, and transmit this first frame by first channel, and produce by the virtual carrier sensing in wireless network communication charge releasing belt and be wider than first frequency band and second frame of the second channel that overlaps with first frequency band, and transmit this second frame by second channel.

A kind of wireless communications method is provided according to a seventh aspect of the invention, this method comprises makes the transmission terminal monitors have execution/non-execution that frame transmits on first channel of first frequency band, when first channel is in the idle condition predetermined periods, keep this channel by utilizing the exchange between transmission terminal and purpose terminal of first channel to transmit request/transmission request-reply frame, make by first channel and receive the second channel that the purpose terminal monitors that transmits claim frame has second frequency band that bandwidth overlaps greater than first frequency band and with first frequency band, and when second channel is in the idle condition predetermined periods, make the purpose terminal send transmission request-reply frame by using second channel.

A kind of wireless communications method is provided according to an eighth aspect of the invention, this method comprises makes the transmission terminal monitors have execution/non-execution that frame transmits on first channel of first frequency band, when first channel is in the idle condition predetermined periods, keep this channel by utilizing the exchange between transmission terminal and purpose terminal of first channel to transmit request/transmission request-reply frame, and, make the control end that the second channel with second frequency band that bandwidth overlaps greater than first frequency band and with first frequency band is managed allow transmitting terminal to use this second channel by utilizing second channel to send the inquiry frame.

Accompanying drawing is described

Fig. 1 is the block diagram according to first Wireless Telecom Equipment of the first embodiment of the present invention;

Fig. 2 is the block diagram according to second Wireless Telecom Equipment of the first embodiment of the present invention;

Fig. 3 shows the view comprise according to the network example of the Wireless Telecom Equipment of the first embodiment of the present invention;

Fig. 4 A and 4B are the figure of explanation according to first channel in first frequency band of the first embodiment of the present invention and the second channel in second frequency band;

Fig. 5 is the chart of the example of the order of connection in the network of displayed map 3;

Fig. 6 A is the operator scheme of the physical layer in the network of key diagram 3 and the time chart of carrier sense State Control to 6E;

Fig. 7 is that explanation is utilizing first and second channels to carry out the view of the adaptive control in period of radio communication in the first embodiment of the present invention;

Fig. 8 is the view that shows first network configuration according to a second embodiment of the present invention;

Fig. 9 A and 9B are the multiplicative model of explanation in first network configuration and the time chart of carrier sense State Control;

Figure 10 is the view that shows second network configuration according to a second embodiment of the present invention;

Figure 11 A and 11B are the multiplicative model of explanation in second network configuration and the time chart of carrier sense State Control;

Figure 12 is the chart that shows the operation that when 40M STA_1 request AP transmits the inquiry frame after exchange RTS/CTS frame is exchanged;

Figure 13 is the chart that shows the operation that when 40M STA_1 is increased to RTS to AP transmission query requests information and with it frame is exchanged;

Figure 14 is the chart that shows the operation that frame is exchanged for from the purpose terminal of the data of 40M STA_1 transmission the time as AP;

Figure 15 is the chart that the situation of wherein abandoning transmitting after 20M_ch_b reservation step is overtime is described;

Figure 16 illustrates that the communication of a third embodiment in accordance with the invention 20-MHz wherein keeps the chart of the situation that step begins after overtime at 20M_ch_b;

Figure 17 is the chart that illustrates wherein owing to be not provided at the situation that the round of carrying out inquiry on the 20M_ch_b abandons transmitting in the overtime time;

Figure 18 illustrates wherein the chart that the situation that 20-MHz communication is performed is only arranged when not being provided at the round of carrying out inquiry on the 20M_ch_b in the overtime time.

Embodiment

(first embodiment)

As shown in Figure 1, the Wireless Telecom Equipment according to first embodiment comprises physical layer 10, MAC layer 20 and link layer 30 substantially.With reference to figure 1, physical layer 10 has two kinds of physical layer protocol of the channel of different frequency bands corresponding to use.More specifically, physical layer 10 comprises utilizes first channel with first frequency band that the first physical layer protocol processing unit 11 that physical layer protocol is handled is carried out in communication, and utilizes the second channel with second frequency band that its bandwidth overlaps greater than first frequency band and with first frequency band to carry out the second physical layer protocol processing unit 12 of physical layer protocol processing to communicate by letter.The first physical layer protocol processing unit 11 and the second physical layer protocol processing unit, 12 common common circuits and unnecessary in force independently of one another.

The agreement of handling by the first physical layer protocol processing unit 11 comprises the physical layer protocol that is for example defined by IEEE 802.11a at least.Suppose that first frequency band that the first physical layer protocol processing unit 11 uses has for example bandwidth of 20MHz.The first physical layer protocol processing unit 11 can adopt utilization to export (MIMO (Multiple-input Multiple-output)) technology at a plurality of antenna 13A of each transmitter side and receiver side to the so-called multi-input multi of 13C.Adopt the MIMO technology not change frequency band and expect that basically the number with antenna increases the transmission capacity pro rata.Therefore this technology has the possibility of the height that the IEEE 802.11 Task Group n (TGn) of the throughput that is intended to further to increase IEEE 802.11 adopt.

Suppose that the second physical layer protocol processing unit 12 adopts a kind of in for example single single output of input (SISO (Single-inputSingle-output)) and the MIMO technology or two kinds.Suppose that the second physical layer protocol processing unit, 12 employed second frequency bands have for example bandwidth of 40MHz.First frequency band is present in second frequency band.

MAC layer 20 comprises channel access control device 21.Channel access control device 21 comprises carrier sense device 22, channel status management devices 23 and taking/release control device 24.MAC layer 20 further comprises network system management device 25.The generation of network system management device 25 management beacon frames, contact and similar incidents, and in needs, be expanded, will after give description.

Carrier sense device 22 is by based on the virtual carrier sensing in wireless network communication information management carrier sense state that obtains in conjunction with the true carrier sense information of obtaining from physical layer 10 and the agreement from MAC layer 20 and the free time/busy state of management channel.That is, the free time/busy state of single or multiple first channels in carrier sense device 22 management first frequency band and the single or multiple second channels in second frequency band is to replace only managing the free time/busy state of individual channel.

Channel occupancy/release control device 24 produces the frame of the virtual carrier sensing in wireless network communication state that is used to control MAC layer 20, and this frame is required to take a channel or discharge occupied channel in the scheduled time slot time.The frame that is produced by channel occupancy/release control device 24 is sent to physical layer 10 and passes through the first physical layer protocol processing unit 11 and 12 transmission of the second physical layer protocol processing unit.

Channel status management devices 23 makes carrier sense device 22, channel occupancy/release control device 24, and the first physical layer protocol processing unit 11 of physical layer 10 and the second physical layer protocol processing unit, 12 coherency operation are to carry out desired channel access control.

The possible example of the Wireless Telecom Equipment shown in Fig. 1 comprises for example 40M/20M MIMO STA (AP) and 40M/20M STA (AP).40M/20M MIMO STA (AP) can carry out SISO transmission/reception by the 20-MHz channel, carry out MIMO transmission/reception by the 20-MHz channel, carry out SISO transmission/reception by the 40-MHz channel, and the terminal (or accessing points) of carrying out MIMO transmission/reception by the 40-MHz channel.40M/20M STA (AP) can carry out SISO transmission/reception and pass through the terminal (or accessing points) that the 40-MHz channel is carried out SISO transmission/reception by the 20-MHz channel.Suppose that link layer 30 is equipped with the function by the general link layer of IEEE 802 definition.

Another Wireless Telecom Equipment as shown in Figure 2 and the difference of the Wireless Telecom Equipment shown in Fig. 1 are that physical layer 10 does not wherein comprise the second physical layer protocol processing unit 12 shown in Fig. 1.The identical point of the Wireless Telecom Equipment among this equipment and Fig. 1 is that first frequency band of the first physical layer protocol processing unit 11 has the nominal bandwidth of 20-MHz and whether it comprises that the MIMO technical elements does not have difference.In addition, these equipment are also identical aspect MAC layer 20 and link layer 30.

Note, although the Wireless Telecom Equipment among Fig. 2 is only carried out medium access control based on the first physical layer protocol processing unit 11, so with the details of the operation of the MAC layer 20 of the Wireless Telecom Equipment shown in Fig. 1 in Fig. 2 on exist part different.If the first physical layer protocol processing unit 11 does not comprise the MIMO technology, the Wireless Telecom Equipment among Fig. 2 can be for according with IEEE 802.11a, IEEE 802.11b, the existing equipment of at least one standard among the IEEE 802.11g.

The possible example of the Wireless Telecom Equipment shown in Fig. 2 comprises for example 20M MIMO STA (AP) and 20M STA (AP).20M MIMO STA (AP) can carry out SISO transmission/reception by the 20-MHz channel, carries out the terminal (or accessing points) of MIMO transmission/reception by the 20-MHz channel.20M STA (AP) is the terminal (accessing points) that can carry out SISO transmission/reception by the 20-MHz channel.

Fig. 3 shows the example of the network 100 that comprises the Wireless Telecom Equipment among Fig. 1 and 2.Base station 101 in the network 100 is the accessing points corresponding to 40M/20M MIMO AP.Terminal 102 to 106 has been set up with base station 101 and has been got in touch.Like this, terminal 102 is 40M/20M MIMO STA_1; Terminal 103 is 40M/20M MIMO STA_2; Terminal 104 is 40M/20M STA; Terminal 105 is 20M MIMO STA; And terminal 106 is 20M STA_1.Suppose that another terminal 107 is 20M STA_2 and belongs to and utilize for example network of 20M_ch_b.

Network 100 among Fig. 3 has the 20-MHz channel 20M_ch_a of the frequency band of utilization from X MHZ to (X+20) MHZ and the 40-MHz channel 40M_ch that utilizes the frequency band from X MHZ to (X+40) MHZ.Therefore, the frequency band from X MHZ to (X+20) MHZ is used by 20-MHz channel and 40-MHz channel redundancy ground.Another uses the 20-MHz channel 20M_ch_b of the frequency band from (X+20) MHZ to (X+40) MHZ not use in the network 100 among Fig. 3, but can be used in another network.

A 20-MHz channel 20M_ch_a that in network 100, uses 40-MHz channel 40M_ch and on frequency, overlap with 40M_ch and a channel among the 20M_ch_b.In other words, 40M/20MMIMO STA and the 40M/20M STA that belongs to network 100 do not use 20M_ch_a and 20M_ch_b simultaneously.

Even attempt to use simultaneously 20M_ch_a and 20M_ch_b,, send and receive and to appear at simultaneously in the same equipment by 20M_ch_b by 20M_ch_a as long as use IEEE 802.11 agreements.For example, if when given terminal receives the addressed Frame that sends on it by 20M_ch_a, terminal need be at fixing short interFrameGap period (SIFS (Short Inter-Frame Space)) back transmission ACK.Because 20M_ch_a is subjected to being independent of the medium access control of 20M_ch_b, the frame exchange can be carried out simultaneously by 20M_ch_b.Even in identical frequency band,, also be difficult to realize carry out simultaneously sending and receiving usually at different channels.Therefore, the terminal of transmission ACK can not receive the frame by the 20M_ch_b exchange.

Below will the connection control that be used to form network 100 be described.In the 40M/20MMIMO AP as base station 101, the first physical layer protocol processing unit 11 utilizes periodically broadcast beacon frames of 20M_ch_a under the control of network system management device 25.Each terminal in the terminal 102 to 106 can receive this beacon frame by non-active scan 20M_ch_a, thus the existence of identification base station 101, the existence of recognition network 100 just.

Perhaps, by carrying out active scan, promptly, utilize 20M_ch_a to pass through itself to send and explore claim frame, and receive the probe response frame from relevant base station 101, each terminal in the terminal 102 to 106 can be discerned the existence of base station 101, just the existence of recognition network 100.

40M/20M MIMO AP as base station 101 operates by 20M_ch_a and 40M_ch basically, but also carries out transmission/reception to switch to 40M_ch (will describe afterwards) by 20M_ch_b temporarily.Like this, 40M/20MMIMO AP ignores the exploration request of 20M_ch_b and does not produce probe response.

Each 102 to 106 terminal is based on being included in by scanning beacon frame that a plurality of channels obtain or the information in the probe response frame, and the received signal intensity of beacon frame or probe response frame and similar information are selected the base station 101 (network 100) that is connected thereto.Especially, comprise base station 101 that indication transmits this frame by beacon frame that transmits as the 40M/20M MIMO AP of base station 101 or probe response frame and be the information corresponding to the accessing points of 40M/20M, indication can be to the information (hereinafter these information will be collectively referred to as accessing points information) and the similar information of the number of the ripple of its MIMO technology multiplex of handling according to base station 101.Accessing points information is comprised among one of them or both in capacity information territory (CIF (Capability InformationField)) and the message elements (IE (Information Element)).These accessing points information can impliedly be indicated by the value of data rate that can be processed sometimes.

Each 102 to 106 terminal is passed through with reference to this kind accessing points Information Selection base station 101 (network 100).That is, for example, terminal 102,103,104 (40M/20M MIMO STA and 40M/20M STA) have improved the priority corresponding to the base station of 40M channel, and terminal 102,103 and 105 (40M/20M MIMO STA and 20M MIMO STA) has improved the priority corresponding to the base station of MIMO.Suppose that terminal 106 (20M STA) can not understand the information that is associated with the 40M channel and be included in from the beacon frame of base station 101 or the MIMO in the beacon response frame.Therefore, these information are to the base station selected not influence of terminal 106 (20M STA).

The example of the order of connection in the network 100 of Fig. 5 displayed map 3.Utilization receives by it and makes terminal therefore find the channel (being 20M_ch_a here) of the beacon/probe response of network 100 to carry out this order of connection.In this case, will carry out mandate before in connection (contact).But, will from Fig. 5 and following description, omit explanation to licensing process.

40M/20M MIMO AP as base station 101 regularly broadcasts indication 40-MHz channel, 20-MHz channel, and four beacons (40M/20M MIMO 4x) that the multiplexing MIMO channel is supported.Each 102 to 106 terminal (40M/20M MIMO STA, 40M/20M STA and 20M STA) receive the beacon (40M/20MMIMO 4x) of this broadcasting, and select to be connected on the network 100.

Terminal 102 to 106 (40M/20M MIMO STA, 40M/20M STA and 20M STA) transmit association request (40M/20M MIMO 2x) to base station 101 (40M/20M MIMO AP), association request (40M/20M) and association request (20M), these association request are the connection request that comprises the information of the ability (data rate that can handle) of indicating each terminal.

Association request (40M/20M MIMO 2x) indication 40-MHz channel, 20-MHz channel and two multiplexing MIMO channels are supported.Association request (40M/20M) indication 40-MHz channel and 20-MHz channel are supported.Association request (20M) indication 20-MHz channel is supported.

In the association request (40M/20M MIMO 2x) that receives as connection request, when association request (40M/20M) and association request (20M), scheme and data rate that base station 101 (40M/20M MIMO AP) storage terminal 102 to 106 is supported.This canned data is used to for example to guarantee transmit this frame when transmit frame time base stations 101 to terminal 102 to 106 in the scope of scheme that each terminal at purpose place is supported and data rate.

Hereinafter will be described the carrier sense State Control in the network 100 of the operator scheme (will be called as the PHY pattern) of physical layer and Fig. 3 to 6E with reference to figure 6A.At Fig. 6 A in the example shown in the 6E, period (20M_ch_a period) by utilizing the 20M_ch_a executive communication and wherein as the 40M/20MMIMO AP of base station 101 control wherein by the switching between the period (40M_ch period) of utilizing the 40M_ch executive communication.At 20M_ch_a period and 40M_ch in the period, the pattern (PCF or HCCA) that to be base station 101 carry out medium access control by inquiry terminal 102 to 106 still terminal 102 to 106 to carry out the pattern that medium access controls on the basis of competition mutually be inessential.

Fig. 6 A shows wherein by at first using the 20M_ch_a executive communication in network 100 to 6E, and recovers the state of 20M_ch_a period at 40M_ch after the period.In network 100,20M_ch_a is used to communicate by letter with 40M_ch.Yet, in order to use 40M_ch, must ban use of take with 40M_ch in the 20M_ch_b of frequency of frequency overlap.20M_ch_b can be used to the adjacent network of another and network 100, perhaps uses.

Fig. 6 A is presented at the sketch of the swap operation of main frame required in the control.Fig. 6 B shows the PHY pattern of 40M/20M MIMO AP and the carrier sense state of each channel (20M_ch_a, 20M_ch_b and 40M_ch).Fig. 6 C shows the PHY pattern of 40M/20M MIMO STA or 40M/20M STA and the carrier sense state of each channel (20M_ch_a and 40M_ch).Fig. 6 D shows 20M MIMO STA or the PHY pattern of 20M STA and the carrier sense state of channel 20M_ch_a.Utilizing 20M MIMO STA or the 20M STA of 20M_ch_a can be the terminal that belongs to network 100.Fig. 6 E shows the PHY pattern of the 20M MIMO STA utilize 20M_ch_b or 20M STA (do not belong to network 100 but belong to the terminal of adjacent networks) and the carrier sense state of 20M_ch_b.

Fig. 6 A does not add MAC layer and the physical layer ground statement carrier sense state distinguished to 6E.In the terminal or base station of carrying out the PHY mode switch, the carrier sense state may be indeterminate.For example, if given terminal in down operation of particular PHY pattern (perhaps can be expressed as channel) A (for example 20M_ch_a), another PHY Mode B (for example 20M_ch_b or 40M_ch) just the actual carrier of physical layer to intercept state indeterminate.In addition, suppose that busy state when the virtual carrier sensing in wireless network communication of MAC layer in specific PHY Mode A (for example 20M_ch_a) is (if perhaps oneself-equipment keeps the medium access right, when effective duration of this right) finishing, this equipment (for example switches to another PHY Mode B, 20M_ch_b or 40M_ch), the virtual carrier sensing in wireless network communication state of the MAC layer in the PHY Mode A of She Zhiing is just indeterminate in advance.If the PHY pattern is switched, the commitment after switching, the carrier sense state of the PHY pattern in the PHY pattern may become indeterminate.

As the carrier sense state, the channel of the free time/busy state that is consistent with operator scheme and the physical layer of current use is selected from the state of various free time of operator scheme/busy and the channel by a plurality of physical layers of carrier sense device 22 management.That is, the carrier sense state that interrelates according to the channel with the operator scheme of oneself-equipment and physical layer 10 basically of each Wireless Telecom Equipment is carried out medium access control.For example, when operating by 40M_ch to locking equipment, this equipment is carried out medium access control according to the carrier sense state of 40M_ch.When operating by 20M_ch_a, this equipment is carried out medium access control according to the carrier sense state of 20M_ch_a.Therefore, indeterminate even the carrier sense state becomes, can not have problems under many circumstances.

Hereinafter will be described operating sequence to 6E with reference to figure 6A.At first, as Fig. 6 B, shown in 6C and the 6D, 40M/20MMIMO AP, 40M/20M MIMO STA, 40M/20M STA, 20M MIMO STA (20M_ch_a) and 20MSTA (20M_ch_a) operate by 20M_ch_a.Shown in Fig. 6 E, 20M MIMO STA (20M_ch_b) and 20M STA (20M_ch_b) operate by 20M_ch_b.

Suppose that under this kind state channel status management devices 23 decision base stations 101 (40M/20M MIMO AP) begin to switch to the order of 40M_ch.Under this kind situation, 40M/20M MIMO AP is by utilizing the carrier sense state of the 20M_ch_a shown in the carrier sense device 22 control chart 6B.When 20M_ch_a is set to idle condition and idle condition is kept PCF interFrameGap (PIFS) during the period, carrier sense device 22 judges that the decision condition of the idle condition of 20M_ch_a is met.When the result of determination of indicating the decision condition of the idle condition of 20M_ch_a to be met from 22 receptions of carrier sense device, channel occupancy/release control device 24 produces frame (hereinafter will be called as Ch_a the take statement frame) F1 of statement 20M_ch_a with occupied first scheduled time slot, and utilizes the first physical layer protocol processing unit 11 to transmit this frame by 20M_ch_a.

The operator scheme that Ch_a takies the same informing network 100 of statement frame F1 switches to 40M_ch from 20M_ch_a.If base station 101 or terminal 102 to 106 can be provided with 40M_ch and 20M_ch in the reception wait state simultaneously, just do not need switching operation modes.If therefore Ch_a takies statement frame F1 and only states that 20M_ch_a is just enough with occupied first period.PIFS is adopted by 40M/20M MIMO AP and obtains media to have precedence over other-end.If adopt different control principles, can use the time interval except PIFS, for example the interFrameGap of Fen Buing (DIFS (Distributed the Inter-FrameSpace)) period adds and retreats the period.Retreating the period is a value between minimum and maximum value by pseudo random number decision.

The period that takies of 20M_ch_a is set to cover at least a 40M_ch scheduled time slot.For the occupied state of specifying 20M_ch_a by the understandable scheme of 20M STA, lasting field is used to the head that Ch_a takies statement frame F1.Suppose that it is 40M/20M MIMO AP that Ch_a takies the purpose terminal of stating frame F1.Channel occupancy/release control device 24 produces Ch_a and takies statement frame F1 under the control of channel status management devices 23.Ch_a takies statement frame F1 and is transmitted in physical layer 10 by the first physical layer protocol processing unit 11.

Ch_a takies statement frame F1 can comprise the information of indication 40M_ch with the occupied period scheduled time.Because indication 40M_ch does not need to have any back compatible with the information of the occupied period scheduled time, just needn't use lasting field, this information can be increased and be fresh information.Perhaps, according to the value that continues field, 20M_ch_a and 40M_ch can occupied identical periods time.

Shown in Fig. 6 C, receiving Ch_a when taking statement frame F1,40M/20M MIMO STA and 40M/20M STA for to be in busy state in the time period of appointment, and switch to 40M_ch with the PHY pattern from 20M_ch_a with the carrier sense setting state of the MAC layer of 20M_ch_a simultaneously.Although Fig. 6 C shows wherein that in advance the carrier sense setting state with the MAC layer of 20M_ch_a is the situation that is in busy state, can take statement frame F1 carrier sense state according to the Ch_a that receives and be set to be in busy state.

Although the operator scheme in this mode lower network 100 is switched to 40M_ch, because the carrier sense state of MAC layer is in busy state, 40M/20M MIMO STA and 40M/20M STA can not transmit frame.That is, channel occupancy/release control device 24 is analyzed Ch_a and is taken statement frame F1, and carrier sense device 22 changes the carrier sense state according to this analysis result.Instruct physical layer 10 to carry out the PHY mode switch after the channel status management devices 23.As a result, this state is implemented.

Shown in Fig. 6 D, when reception Ch_a took statement frame F1, the carrier sense state of the MAC layer of 20M MIMO STA (20M_ch_a) and 20MSTA (20M_ch_a) 20M_ch_a was set to be in busy state in the time period of appointment.Because Ch_a takies statement frame F1 and transmitted by 20M_ch_a, 20M MIMO STA (20M_ch_b) and 20M STA (20M_ch_b) do not receive F1.

Shown in Fig. 6 B, base station 101 (40M/20M MIMO AP) arrives 20M_ch_b with the PHY mode switch.After this handover operation, 40M/20M MIMO AP is transmitted in idle condition and keeps PIFS and state after the period that 20M_ch_b is with the frame of occupied predetermined amount of time (will be called as Ch_b hereinafter and take the statement frame) F2.Ch_b takies statement frame F2 and can notify the operator scheme of the terminal of other network (not being shown) that is different from network 100 that belongs to the identical physical media of shared and network 100 to change to 40M_ch from 20M_ch_b equally.As the situation that Ch_a takies statement frame F1, PIFS is adopted by 40M/20M MIMO AP and obtains media to have precedence over other terminal.In addition, if adopt different control principles, as the situation that Ch_a takies statement frame F1, can use the time interval except PIFS, for example the DIFS period adds and retreats the period.

It is indeterminate to the carrier sense state of 20M_ch_b 20M_ch_b before to abut against the PHY mode switch.In general, the carrier sense of physical layer 10 has hypersensitivity at the fore-end at the head place of frame, and some the intermediate point sensitivity in this frame are low.Therefore judge PIFS in the period 20M_ch_b be in idle condition and have danger.Based on this reason, be preferably in to finish to receive to be in and check the carrier sense state when Ch_b takies first frame before the statement frame F2 by 20M_ch_b.But note, having highly and may not be actually used by 20M_ch_b in by the network 100 of base station 101 management because 20M_ch_b does not use.Therefore under this kind situation, use the PIFS period for the consideration of efficient.

Shown in Fig. 6 E, when receiving Ch_b and take statement frame F2,20M MIMO STA (20M_ch_b) and 20MSTA (20M_ch_b) with the carrier sense setting state of the MAC layer of 20M_ch_b for to be in busy state in the time period of appointment.Take statement frame F2 owing to transmit Ch_b, be switched to the 40M/20MMIMO STA of 40M_ch and 40M/20M STA and the 20M MIMO STA (20M_ch_a) by the 20M_ch_a operation and 20M STA (20M_ch_a) and do not received Ch_b and take the statement frame by 20M_ch_b.

Shown in Fig. 6 B, then 40M/20M MIMO AP arrives 40M_ch with the PHY mode switch.After this handover operation, 40M/20M MIMO AP transmits after the duration of the idle condition of SIFS period and is used to discharge the frame of occupied 40M_ch (hereinafter will be referred to as 40M_ch and discharge frame) F3.Because 40M/20M MIMO AP guarantees the 40M_ch media, the duration of the idle condition of SIFS period does not need always to be checked, but can be checked.

Shown in Fig. 6 C, when receiving 40M_ch release frame F3, the carrier sense state of the MAC layer of 40M/20M MIMO STA and 40M/20M STA 40M_ch is set to be in the time period of idle condition appointment.Note,, just do not need always to preestablish the period if the end of idle period will be notified respectively.At this time point, at all 40M/20M MIMO AP by the 40M_ch operation, among 40M/20M MIMO STA and the 40M/20M STA, the carrier sense state of MAC is set to be in idle condition.Next, as shown in Figure 6A, media is guaranteed by general medium access, and the 40M_ch frame is exchanged.

Be transmitted by 40M_ch because 40M_ch discharges frame F3,20M MIMO STA (20M_ch_a), 20M STA (20M_ch_a), 20M MIMO STA (20M_ch_b) and 20M STA (20M_ch_b) do not receive 40M_ch and discharge frame F3.At this time point, because the carrier sense state of the MAC layer of the 20M_ch_a of 20M MIMO STA (20M_ch_a) and 20M STA (20M_ch_a) is in busy state, the carrier sense state of the 20M_ch_b of 20M MIMO STA (20M_ch_b) and 20MSTA (20M_ch_b) is in busy state, 20M MIMO STA (20M_ch_a), 20M STA (20M_ch_a), 20M MIMO STA (20M_ch_b) and 20M STA (20M_ch_b) do not transmit any 20M_ch_a or 20M_ch_b frame that disturbs with 40M_ch.

Hereinafter will with reference to figure 6A to 6E in network 100 from by utilizing pattern that 40-MHz channel (40M_ch) communicates to being described by the transfer sequence that utilizes the pattern that 20-MHz channel (20M_ch) communicates.During this time by utilize period that 40M_ch communicates and during be hereinafter referred to as 40M_ch period and 20M_ch period by the period of utilizing 20M_ch to communicate.

The 40M_ch period can end at 40M_ch the latter stage that takies the period in the period naturally.Perhaps, as shown in Figure 6A, 40M/20M MIMO AP can transmit frame (will the be called as 40M_ch period end frame) F4 in the latter stage of notifying the 40M_ch period clearly.40M_ch period end frame F4 sends taking the period and switching to the instruction of 20M_ch_a of the new 40M_ch of beginning clearly or impliedly.

When 40M_ch finished naturally or receive 40M_ch period end frame F4, shown in Fig. 6 C, the carrier sense state of the MAC of 40M/20MMIMO STA and 40M/20M STA 40M_ch was set to be in busy state, and the PHY mode switch is arrived 20M_ch_a.The carrier sense state of the MAC of 20M_ch_a is retained as and is in busy state, and 40M/20M MIMO STA and 40M/20M STA can't transmit the 20M_ch_a frame.

Shown in Fig. 6 D and 6E, because 40M_ch period end frame F4 is transmitted by 40M_ch, 20M MIMO STA (20M_ch_a), 20M STA (20M_ch_a), 20M MIMO STA (20M_ch_b) and 20M STA (20M_ch_b) do not receive any 40M_ch end frame.In addition, because 20M MIMO STA (20M_ch_a), 20M STA (20M_ch_a), 20M MIMO STA (20M_ch_b) and 20M STA (20M_ch_b) do not have any state of getting in touch with 40M_ch, even 40M_ch finishes also not take place any special change naturally.

Next, shown in Fig. 6 B, 40M/20M MIMO AP to 20M_ch_b, and as shown in Figure 6A, transmits frame (hereinafter will be referred to as Ch_b and the discharge frame) F5 of the occupied state that is used to discharge 20M_ch_b with the PHY mode switch.Can follow the setting that takies the period that after the 40M_ch period finishes, finishes 20M_ch_b the period that takies of 20M_ch_b is finished naturally by making in advance.

Shown in Fig. 6 E, take the period when finishing naturally what receive that Ch_b discharges frame F5 or 20M_ch_b, the carrier sense state of the MAC layer of 20M MIMOSTA (20M_ch_b) and 20M STA (20M_ch_b) 20M_ch_b is set to be in idle condition.By this operation, 20M MIMO STA (20M_ch_b) and 20M STA (20M_ch_b) can begin to exchange the 20M_ch_b frame.

Be transmitted by 20Mc_h_b because Ch_b discharges frame F5, the 40M/20MMIMO STA and the 40M/20M STA that have been switched to 20M_ch_a still do not receive Ch_b release frame F5 by the 40M/20M MIMO STA (20M_ch_a) and the 20M MIMO STA (20M_ch_a) of 20M_ch_a operation.In addition, because 40M/20M MIMO STA, 40M/20M STA, 20M MIMO STA (20M_ch_a) and 20M MIMO STA (20M_ch_a) do not have any state of getting in touch with 20M_ch_b, even the period that takies of 20M_ch_b ends naturally, any special change does not take place yet.

Next, shown in Fig. 6 B, 40M/20M MIMO AP to 20M_ch_a, and as shown in Figure 6A, transmits frame (hereinafter will be referred to as Ch_a and the discharge frame) F6 of the occupied state that is used to discharge 20M_ch_a with the PHY mode switch.Can finish and the setting that takies the period that finishes 20M_ch_a after the period that takies of 20M_ch_a finishes the period that takies of 20M_ch_a naturally by making in advance following in the 40M_ch period.

Take the period when finishing naturally what receive that Ch_a discharges frame F6 or 20M_ch_a, be switched to 40M/20M MIMO STA and the 40M/20M STA of 20M_ch_a, and the carrier sense state of the MAC layer of 20M MIMO STA (20M_ch_a) by 20M_ch_a operation and 20M STA (20M_ch_a) 20M_ch_a is set to be in idle condition.By this operation, 40M/20M MIMO STA, 40M/20M STA, 20M MIMO STA (20M_ch_a) and 20M STA (20M_ch_a) can begin to exchange the 20M_ch_a frame.

Be transmitted by 20M_ch_a because Ch_a discharges frame F6, the 20M MIMO STA (20M_ch_b) and the 20M STA (20M_ch_b) that operate by 20M_ch_b do not receive Ch_a release frame F6.In addition, because 20M MIMOSTA (20M_ch_b) and 20M STA (20M_ch_b) do not have any state of getting in touch with 20M_ch_a, even the period that takies of 20M_ch_a ends naturally, any special change does not take place yet.

Note, even only can make the terminal that also can send/receive by realizing coexisting with above-mentioned essentially identical order by 40M_ch.

According to said sequence,, 40M/20M MIMO AP begins the 40M_ch period when 40M_ch discharges frame F3 when transmitting.This is to make each equipment obtain the order of media herein on the basis that the 40M_ch based on distributed coordination function (DCF (Distributed Coordination Function)) or EDCA (HCF Contention Access contention access) (annotate in the school: may be wrong in the original text) competed in the period.Yet, be necessary the scheme that provides such, wherein as the 40M/20M MIMO AP of the base station in the network basically by with point coordination function (PCF (Point Coordination Function)), the visit (HCCA (HCF Controlled Access)) of HCF control or similar functions be that basic inquiry scheme is to each terminal distribution medium access right.Under this kind situation, as beginning 40M_ch during the period, 40M/20M MIMO AP can transmit the frame of the period that medium access right between clear and definite prescribed phase is assigned with by the inquiry scheme that substitutes 40M_ch and discharge frame F3.This frame comprises with the form of purpose terminal address etc. clearly indicates the medium access right will be assigned to the information of remote terminal wherein by inquiry.

In the operational instances shown in the 6E, the 20M_ch_a that utilizes in the network 100 was set to be in busy state before 20M_ch_b, and was released after 20M_ch_b at Fig. 6 A.Among the 40M/20M MIMO AP of the 20M_ch_b that uses in network 100, the carrier sense state does not become indeterminate.As a comparison, occur among the 20M_ch_a that this kind state can not use in this network.Owing to this reason, if the reliability of carrier sense state has importance, this order is seemingly preferable.But, even taking place, the associated order that takies and discharge of 20M_ch_a and 20M_ch_b changes, the essence of this operation does not change.

For example, if 20M_ch_b is occupied before 20M_ch_a, and be released after 20M_ch_a, the instruction that is used for taking 20M_ch_a and discharging 40M_ch can be integrated into a frame.In addition, (40M_ch takies) and the instruction that discharges 20M_ch_a can be integrated into a frame to be used for finishing the 40M_ch period.

At Fig. 6 A in the operational instances shown in the 6E, suppose when physical layer 10 is operated by 40M_ch, 40M/20MMIMO AP, among 40M/20M MIMO STA and the 40M/20M STA each all can not transmit/receive any 20M_ch_a frame, and when physical layer 10 is operated by 20M_ch_a, 40M/20M MIMO AP, each among 40M/20MMIMO STA and the 40M/20M STA all can not transmit/receive any 40M_ch frame.

If 40M/20M MIMO AP when not carrying out switching operation modes, 40M/20M MIMO STA and 40M/20M STA can transmit/receive 20M_ch_a frame and 40M_ch frame (particularly, if they can receive any frame when not being predetermined 20M_ch_a or 40M_ch), order above can further be simplified.That is, it is not distinguished and to carry out the exchange of 20M_ch_a and 40M_ch frame just enough if when 40M/20M MIMOAP statement only has 20M_ch_b occupied, do not need.

At Fig. 6 A in the operational instances shown in the 6E, when 40M/20M MIMO AP attempts to obtain 20M_ch_b, because 20M_ch_b is maintained at busy state preset time section or longer time, 40M/20M MIMO AP may have no chance to send Ch_b and take statement frame F2.Under this kind situation, 40M/20M MIMO AP can abandon starting the 40M_ch period and transmit Ch_a and discharge frame so that recover the 20M_ch period.Even if 40M/20M MIMO STA and 40M/20M STA also can receive by 20M_ch_a in the PHY pattern, because discharging frame by Ch_a, they can notify the 40M_ch period not begin, they can control the PHY pattern equally.In addition, 40M/20MMIMO AP and 40M/20M STA can shared timeout values in whole BSS (for example by the shared information that is included in the information in the beacon or will be exchanged in the time of contact), if the PHY pattern is not turned back to 20M_ch_a in order to receive any 40M_ch in the preset time section when discharging frame.Under any circumstance, if the Ch_a of each STA is set to be in idle condition, and the PHY pattern to be returned to 20M_ch_a just enough.Except this method, multiple implementation method can be arranged according to control frame and overtime combination.

Although do not show, be that the head of 40M channel frame is provided with and the common PLCP head part of 20M channel frame, 20M STA and 20M MIMO STA are received and explanation is included in speed and length field in the PHY head of the 40M channel frame that transmits with 40M PHY pattern.20M STA and the 20M MIMO STA explanation PHY occupied time that calculates of utilizing length divided by speed of media.According to this configuration, the F3 that is used for taking the F2 of ch_b and is used to discharge the 40M channel can be integrated into a 40M channel frame.That is, be included in the common PLCP head of 20M channel frame in speed and length be set to cover at least during the part-time of occupied period of 20M_ch_b, and time of taking of the frame that this period suitably is longer than will be transmitted itself.By this operation, be present in 20M STA among the 20M_ch_b and 20MMIMO STA judge from the period that data and length computation obtain be peak hours/period.

Be included in the common PLCP head of 20M channel frame in speed and length do not need with the actual transfer rate and the data length of respective frame consistent.This is because 40M/20M MIMO STA and 40M/20M STA can be by only (being noted by notified actual transfer rate of the accessible method of the equipment that can receive the 40M channel frame and data length, if 20M STA is that conventional equipment and 20M MIMO STA are the equipment that accords with new criteria, 40M PHY frame can be designed to make equally 20M MIMO STA explanation this point).40M/20M STA and 40M/20M MIMO STA can illustrate a part of following with the common PLCP head part of 20M channel frame.Utilize this part, actual transfer rate (40M speed) and data length (40M length) and 40M/20M STA and the d/d information of the notified indication of 40M/20M MIMO STA 40M channel.Although 40M speed and 40M length are comprised in the PHY head, indication 40M channel d/d information can or be included in the MAC head for the part of the information of PHY head.

If 20M STA is based on the standard of IEEE 802.11a or IEEE 802.11g, can be set to 4095 eight bit bytes (octet) and speed by length and be set to 6Mbps the maximum period (5.46msec) is set.Although should exchange the period by unnecessary covering of period 40M channel frame, if the 40M PHY frame that has with the common PLCP head part of 20M PHY frame is exchanged in the exchange period at the 40M channel frame, and be included in the common PLCP head part of 20M PHY frame in speed and length suitably be provided with so that comprise the exchange of follow-up 40M channel frame, the 40M channel frame exchange period can be used as whole by seamless covering.

In addition, 40M_ch period end frame F4 and Ch_b release frame F5 can be integrated in the 40M channel frame equally.Under this kind situation, because 20M STA and 20M MIMO STA can not be correctly decoded the frame main body of this 40M channel frame, after the period by data and Length Indication finished, they waited for the EIFS period that defines for the mistake recovery.As a result, the wait period before the 20M_ch_b visit is longer than the common time.For fear of this problem, can be configured to shorter by period of data and Length Indication than the period that is initially taken by the 40M channel frame.In addition, the 40M channel frame that will in the 40M channel frame exchange period, be exchanged, should be configured to be no more than the end point of the 40M period of expectation with speed that is provided with in the common PLCP head part of 20M channel frame and length.

It is the operation that is similar to the PHY mode switch operation shown in Fig. 6 C that this configuration can make the PHY mode switch simplified control from the 40M/20M MIMO AP of the operation shown in Fig. 6 B, and reduces the number of frame.40M/20MMIMO AP/STA and 40M/20M STA suppose when will use 40M and 20M in its handoff procedure, still be not the second half corresponding to the first half of 40M_ch for each AP determines 20M_ch_a, but it is defined as standard, thereby make whole system according to this standard operation.Under this kind situation, although each equipment must use 20M_ch_a and 40M_ch when switching 20M_ch_a and 40M_ch, do not need to consider to use the mode of 20M_ch_a and 40M_ch yet, just, how to switch 20M_ch_a and 40M_ch.Can conveniently implement like this.

Fig. 7 is presented at the example of the adaptive control on 20M_ch period and the time scale of 40M_ch between the period.According to the scheme of describing to 6E with reference to figure 6A, in channel status management devices 23 Control Network 100 in base station 101 (40M/20M MIMO AP) during period of being used of 20M_ch a length and during the length of period of being used of 40M_ch.Thereby be necessary to judge the time that to distribute to 20M_ch period and 40M_ch period.Although this time can be simple fixed value, Fig. 7 to based on 20M_ch period and 40M_ch in the period method of network usage control 20M_ch period and the time scale of 40M_ch between the period carry out instantiation and describe.Under this kind situation, network usage is defined as the media utilization rate that calculates from the busy state that is obtained the period at 20M_ch period and 40M_ch by carrier sense device 22 and the ratio between the idle condition.

Provide suitable principle how to distribute to the time of 40M_ch period and 20M_ch period according to the control of media utilization rate to judge.For example, if use the equipment of 20M_ch and use the equipment of 40M_ch to be allowed to use as far as possible in the same manner media, the time ratio is controlled as the third side that is among Fig. 7 to (20M_ch media utilization rate=medium, 40M_ch media utilization rate=medium).If use the equipment of 40M_ch to have precedence over the equipment that uses 20M_ch, the time ratio is controlled as the lower one that is among Fig. 7 to (20M_ch media utilization rate=low, 40M_ch media utilization rate=height).If use the equipment of 20M_ch to have precedence over the equipment that uses 40M_ch, the time ratio is controlled as the higher direction (20M_ch media utilization rate=height, 40M_ch media utilization rate=low) that is among Fig. 7.

Channel status management devices 23 in the base station 101 (40M/20M MIMO AP) determines above-mentioned time ratio based on information of being obtained by carrier sense device 22 and principle, thereby controls 40M_ch and 20M_ch period adaptively.Channel status management devices 23 obtains the necessary information of above-mentioned time ratio and can obtain by the carrier sense device 22 in base station 101 (40M/20M MIMOAP), perhaps can obtain by the carrier sense device in other terminal and the channel status management devices 23 in base station 101 in be collected.

In addition, can be measured in 40M/20M MIMO STA and the media utilization rate of 40M/20M STA of 20M_ch in the period.If media utilization rate height, the length of 40M_ch period can increase.Terminal that can be by the 40M_ch executive communication as 40M/20M MIMO STA and 40M/20M STA, uses the fact of 20M_ch period can show that the 40M_ch period compares the height possibility of the weak point of being asked in a large number.This control is effective to this situation.

(second embodiment)

Fig. 8 and 10 network configuration that show according to a second embodiment of the present invention.With reference to figure 8 and 10,40M STA_1 attempts by using the 40MHz channel to transmit frame to 40M STA_2.20M_ch_a is used in respectively in the different basic service devices (BSS) with the independent medium access of carrying out with 20M_ch_b.With reference to figure 8 and 10, consider that the BSS_a that 40M STA_1 wherein is connected thereto uses 20M_ch_a, and use the situation of 20M_ch_b with the adjacent or overlapping BSS_b of BSS_a.

In 20M_ch_a, carry out medium access by DCF or EDCA.In 20M_ch_b, can carry out medium access by DCF or EDCA or PCF or HCCA.Fig. 8 shows the situation of wherein carrying out medium access in 20M_ch_a and 20M_ch_b by DCF or EDCA.DCF or EDCA are wherein passed through in Figure 10 demonstration in 20M_ch_a, and carry out the situation of medium access in 20M_ch_b by PCF or HCCA.

Hereinafter will be with reference to figure 9A, 9B, and 11A and 11B are described multiplicative model in the network configuration of this embodiment and carrier sense State Control.

At first, 40M STA_1 carries out carrier sense on 20M_ch_a, and is set to be in preceding maintenance wait of idle state preset time period (DIFS or AIFS) at 20M_ch_a.When the idle state of the period scheduled time that detects 20M_ch_a, 40M STA_1 begins to retreat counting down of counter.When retreating counter and become 0,40MSTA_1 transmits RTSa by utilizing 20M_ch_a to 40M STA_2, and waits for from 40M STA_2 received frame.

Suppose that RTSa comprises by the RTS frame of IEEE 802.11 definition and the frame sequence that is begun by this frame, perhaps by expanding the frame sequence that this frame obtains.This frame sequence can be expanded, thereby also comprises except indication CTSa will be sent to the information of the channel (20M_ch_a) that RTSa is sent to and indicate the CTSb when the idle condition of another channel (20M_ch_b) is checked that is described further below with the information that is transmitted.The channel that another its idle condition will be checked can be specified recessively.For example, if 40M_ch by the definition of the channel spacing of 40MHz, will be specified with the 20M_ch of given 20M_ch pairing recessively.Perhaps, another channel can be specified clearly by the information element of RTSa.About only can transmit/receive the equipment of data immediately by individual channel, frame sequence can hint the operator scheme that switches to another channel corresponding physical layer that will be checked with its idle condition.

When receiving RTSa, in the SIFS time that receives after RTSa finishes, 40M STA_2 returns CTSa by using 20M_ch_a to 40M STA_1.Thereby on 20M_ch_b, begin carrier sense.If 40M STA_2 only can handle individual channel immediately, for the carrier sense on 20M_ch_b, 40M STA_2 switches to 20M_ch_b with the operator scheme of physical layer.CTSa can be the common CTS by IEEE 802.11 definition, perhaps can be to make 40M STA_1 prepare to receive the CTS of the CTSb that transmits by the CTSa transfer source that is described further below when the idle condition of another channel (20M_ch_b) is checked.

Each has received the 40M STA of the RTSa that transmits by 20M_ch_a or CTSa and 20M STA that each belongs to BSS_a and had been under an embargo before the stipulated time that the transmission of Frame finishes and transmits.The 40M STA_1 that is retained in for 40M STA_1 that supposes 20M_ch_a finishes when 40M STA_2 receives CTSa by 20M_ch_a.If 40M STA_1 only can handle individual channel immediately, its operator scheme with physical layer switches to 20M_ch_b.

Next will be described the situation that BSS_b wherein carries out DCF or EDCA with reference to figure 8 to 9B.

When detecting DIFS or the idle condition of AIFS time in the carrier sense process of 40M STA_2 on 20M_ch_b, 40M STA_2 transmits CTSb by using 20M_ch_b to 40M STA_1.If 40M STA_2 only can handle individual channel immediately, its operator scheme with physical layer switches to 40M_ch to receive the frame of expectation from 40M STA_1.When receiving CTSb, each 20M STA that belongs to BSS_b was under an embargo before the stipulated time that the transmission of Frame finishes and transmits.The 40M STA_1 that is retained in for 40M STA_1 that supposes 20M_ch_b finishes when 40M STA_2 receives CTSa by 20M_ch_b.Thereby 40M STA_1 judges 20M_ch_a and 20M_ch_b and is retained, and utilizes 20M_ch_a and 20M_ch_b to transmit Frame for the 40-MHz channel.Under this kind situation, if 40M STA_1 only can handle individual channel immediately, its operator scheme with physical layer switches to 40M_ch.

20M_ch_b can be maintained at busy state after the reservation of 20M_ch_a, even and also can not be retained after long-time section.Therefore, if 40M STA_1 receives CTSb by 20M_ch_b in the preset time section after by 20M_ch_a reception CTSa, 40M STA_1 judges overtime, and transmits the transmission illegal state that RTS/CTS realizes that passes through that NAV release frame discharges 20M_ch_a by 20M_ch_a.

Next will be described the situation that BSS_b wherein carries out PCF or HCCA to 11B with reference to Figure 10.

During 40M STA_1 wait for receive CTSa by 20M_ch_a after from the period of 40M STA_2 received frame, send to destination address when being the inquiry frame of 40M STA_1 when 40M STA_1 receives from the AP_b of BSS_b, 40MSTA_1 uses the Frame of 20M_ch_a and 20M_ch_b transmission 40-MHz channel by the SIFS time after receiving the inquiry frame.

Consider such situation, wherein ignore the fact that 20M_ch_a has been retained, even after the past time of long-time section, because 40M STA_1 obtains carrying out by 20M_ch_b the expensive time of round of inquiry, the Frame of 40-MHz channel still can not be transmitted.Therefore under this kind situation, if 40M STA_1 receives the inquiry frame by 20M_ch_b in the preset time section after by 20M_ch_a reception CTS, 40M STA_1 judges overtime, and transmit NAV release frame by 20M_ch_a, thereby discharge the transmission illegal state that RTS/CTS realizes that passes through of 20M_ch_a.

Send the scheme of the inquiry frame that is addressed to 40M STA_1 as the AP_b that makes BSS_b, for example, a scheme in the following scheme can be used: when inquiring about in BSS_b, set in advance the scheme of the transmission inquiry frame that is exclusively used in 40M STA in the search sequence of predetermined circulation; When beginning to inquire about, replenishes BSS_b the scheme that in search sequence, obtains the 40M STA of round of waiting for; And in predetermined circulation, carry out the scheme that this 40M STA replenishes process.

Perhaps, just enough if can receive the inquiry frame that AP sends in early days according to following scheme.Suppose that AP supports the 40M band communication, and can utilize 20M_ch_a and 20M_ch_b to communicate immediately by two channels.

(scheme 1): AP is impelled to transmit the inquiry frame, thereby allows 40M STA_1 to receive the inquiry frame by 20M_ch_b in the preset time section after guaranteeing 20M_ch_a.

(scheme 2): guarantee 20M_ch_a when receiving the inquiry frame by 20M_ch_b in the preset time section of 40M STA_1 after guaranteeing 20M_ch_a.

At first description scheme 1.According to scheme 1, make and send the inquiry frame that is addressed to 40M STA_1 in the preset time section of AP after 40M STA_1 guarantees 20M_ch_a.More specifically, 40M STA_1 sends the claim frame of the transmission that impels the inquiry frame to AP.

Figure 12 shows when 40M STA_1 request AP sends after the RTS/CTS exchange to inquire about the chart how the frame time frame exchanges.With reference to Figure 12, at first, as in the situation shown in Figure 11 A and the 11B, 40M STA_1 guarantees 20M_ch_a by the RTSa/CTSa exchange.Afterwards, 40M STA_1 sends the SIFS time of request AP after CTSa receives sends the inquiry frame by use 20M_ch_a query requests frame to AP.When receiving the query requests frame, AP carries out the scheduling (scheduling) that transmits next inquiry frame to 40MSTA_1.

If AP has completed successfully this scheduling and can transmit ensuing inquiry frame to 40M STA_1, the SIFS time of AP after the query requests frame receives enables frame by using 20M_ch_a to return the inquiry of indicating the inquiry frame to be transmitted to 40M STA_1.When receiving inquiry from AP and enable frame, 40M STA_1 such as begins at frame to be checked.When receiving the inquiry frame by 20M_ch_b, 40M STA_1 utilizes 20M_ch_a and 20M_ch_b to send data to 40M STA_2 on the 40M frequency band.

If AP does not finish this scheduling and can not transmit ensuing inquiry frame to 40M STA_1, AP does not transmit any information to 40M STA_1.If enable frame without any inquiry and returned from AP in the back in the past from SIFS time that the transmission of query requests frame begins, 40M STA_1 judges that it can not guarantee 20M_ch_b, and only sends data to 40M STA_2 with 20M_ch_a on the 20M frequency band.

Under this kind mode, guarantee after the 20M_ch_a that by the RTS/CTS between 40M STA_1 and the 40M STA_2 exchange query requests/inquiry that 40M STA_1 carries out with AP enables exchange, thereby request AP transmits and inquires about frame.40M STA_1 can take place to receive the inquiry frame by 20M_ch_b before overtime after guaranteeing 20M_ch_a like this.

Figure 13 is the chart that shows the operation of the switching frame when AP transmits this query requests information when 40M STA_1 adds query requests information on the RTS.With reference to Figure 13,40M STA_1 upward forms a frame (RTSa+ query requests frame) by the query requests information that is addressed to AP being added to the RTSa that is addressed to 40M STA_2, and by utilizing 20M_ch_a to transmit this frame.

When receiving RTSa+ query requests frame, the SIFS time utilization 20M_ch_a of 40M STA_2 after receiving RTSa+ query requests frame returns to 40M STA_1 and is used to make peripheral terminal that the CTSa of NAV is set.When receiving RTSa+ query requests frame, AP has asked to inquire about frame from the query requests field identification 40M STA_1 of RTSa+ query requests frame, and carries out the scheduling that transmits next inquiry frame to 40M STA_1.

If AP completes successfully this scheduling and can transmit ensuing inquiry frame to 40M STA_1, the SIFS time utilization 20M_ch_a of AP after receiving the CTSa frame returns the inquiry of indicating this inquiry frame to be transmitted to 40M STA_1 and enables frame.When receiving inquiry from AP and enable frame, 40M STA_1 such as begins at frame to be checked.When receiving the inquiry frame by 20M_ch_b, 40M STA_1 utilizes 20M_ch_a and 20M_ch_b to send data to 40M STA_2 on the 40M frequency band.

If AP does not finish this scheduling and can not transmit ensuing inquiry frame to 40M STA_1, AP does not transmit any information to 40M STA_1.If even enable frame without any inquiry and returned in the back in the past from SIFS time that the reception of CTSa frame begins from AP, 40M STA_1 judges that it can not guarantee 20M_ch_b, and only sends data to 40M STA_2 with 20M_ch_a on the 20M frequency band.

Under this kind mode, transmit query requests information to AP when going up by query requests information being added to RTS, 40MSTA_1 can take place to receive by 20M_ch_b before overtime guaranteeing 20M_ch_a after and inquire about frame.

Figure 14 is the chart that shows when the operation of the switching frame of AP when being purpose terminal from the data of 40M STA_1 transmission.In this case, because RTSa and query requests all are addressed to AP, 40M STA_1 can transmit query requests information to AP when adding to query requests information on the RTSa.On the other hand, AP can return the inquiry frame equally and transmit enable information when adding to inquiry frame transmission enable information on the CTSa.

With reference to Figure 14, at first, 40M STA_1 goes up a formation frame (RTSa+ query requests frame) by query requests information being added to RTSa, and utilizes 20M_ch_a to transmit this frame to AP.When receiving RTSa+ query requests frame, AP is from the query requests field identification 40M STA_1 request inquiry frame of RTSa+ query requests frame, and execution transmits the scheduling of next inquiry frame to 40MSTA_1.

If AP completes successfully this scheduling and can transmit ensuing inquiry frame to 40M STA_1, the SIFS time utilization 20M_ch_a of AP after receiving RTSa+ query requests frame returns the CTSa+ inquiry to 40M STA_1 and enables frame.CTSa+ inquiry enables frame and goes up and it is integrated into a frame and obtain by adding indication AP to CTSa to the inquiry enable information that 40M STA_1 transmits the inquiry frame.When receiving the CTSa+ inquiry that sends from AP and enable frame, 40M STA_1 begins to wait for and receives the inquiry frame.When receiving the inquiry frame by 20M_ch_b, 40M STA_1 utilizes 20M_ch_a and 20M_ch_b to send data to 40M STA_2 on the 40M frequency band.

If AP does not finish this planning and can not transmit ensuing inquiry frame to 40M STA_1, AP returns the CTSa frame to 40MSTA_1.When receiving the CTSa frame, 40M STA_1 can know that 20M_ch_a is guaranteed.In addition, owing to there is not query requests information to be added on the CTSa frame, 40M STA_1 judges that 20M_ch_b is not guaranteed, and only sends data to 40M STA_2 with 20M_ch_a on the 20M frequency band.

As mentioned above, if AP is the purpose terminal of the data that send from 40M STA_1, adds RTSa/CTSa to and go up the RTSa+ query requests frame/CTSa+ that obtains and inquire about and enable frame and be carried out exchange by query requests information (query requests)/inquiry frame being transmitted enable information (inquiry enables).Can guarantee 20M_ch_a so simultaneously and the purpose terminal of ensuing inquiry frame is set to 40M STA_1.After guaranteeing 20M_ch_a, take place overtime before 40M STA_1 can receive the inquiry frame by 20M_ch_b.

Next description scheme 2.In scheme 2,40M STA_1 guarantees 20M_ch_a from the time that 20M_ch_b receives the inquiry frame at 20M_ch_a in by the predetermined amount of time after guaranteeing.40M STA_1 guarantees 20M_ch_a according to the time that receives the inquiry frame by 20M_ch_b from AP by transmitting RTS to 20M_ch_a.

At first, the 40M_STA_1 of plan utilization 40M frequency band transmission data calculates oneself-terminal and will receive the preset time of inquiry frame from AP.For example, each STA can utilize and be stored in such as calculating the planning time that receives the inquiry frame from AP from the scheduling component information (schedule elementinformation) in the mac frame of the ADDTS response frame of 802.11e wireless local area network (WLAN) system or scheduling frame (schedule frame).

Next, based on predetermined inquiry frame time of reception, 40M STA_1 calculates indication and when transmits RTS so that receiving the RTS delivery time that keeps 20M_ch_a before the inquiry frame from AP by 20M_ch_b by 20M_ch_a.When reaching RTS during the delivery time, 40M STA_1 carries out carrier sense on 20M_ch_a.If the 20M_ch_a free time, 40MSTA_1 goes up to 20M_ch_a and transmits the RTS frame.If it is not idle that the result of carrier sense judges 20M_ch_a, the SIFS time of 40M STA_1 after receiving the inquiry frame is only by utilizing 20M_ch_b to transmit data.

In this manner, 40M STA_1 receives the scheduled time of inquiry frame by RTS being sent to the last 20M_ch_a that keeps of 20M_ch_a from AP by 20M_ch_b according to 40M STA_1.The 20M_ch frequency band that keeps before so just preventing long-time section ground before can being guaranteed up to two 20_M_ch frequency bands is idle, does not guarantee the 40M frequency band thereby do not waste under the situation of any frequency band.

As mentioned above, according to second embodiment, make 40M STA_1 guarantee that the 40-MHz channel makes the terminal that wherein produces the transmission frame can guarantee a channel according to the transfer mode (still is that 40M ch transmits by 20M ch) of frame.

(the 3rd embodiment)

<EDCA>

According to above-mentioned second embodiment, can not be retained long-time section if keep back 20M_ch_b at 20M_ch_a because 20M_ch_b maintains busy state, promptly, if do not receive CTSb in the predetermined amount of time of 40M STA_1 after receiving CTSa by 20M_ch_b by 20M_ch_a, 40M STA_1 determines overtime, and transmits the transmission illegal state owing to the RTS/CTS realization that NAV release frame discharges 20M_ch_a by 20M_ch_a.

As a comparison, a third embodiment in accordance with the invention if the 40M frequency band can not be guaranteed under this mode, is not wasted any frequency band thereby the 20M_ch frequency band that is retained is prevented from being set to being in long-time section idle condition before.

Promptly, in the third embodiment of the present invention, if 20M_ch_b can not be retained long-time section after keeping 20M_ch_a because 20M_ch_b keeps busy state, and take place overtime, 40M STA_1 is only by utilizing 20M_ch_a to communicate, therefore successfully realize keeping, discharge 20M_ch_a and interrupt communication itself to substitute.Owing to this reason, detect the passage of time of the predetermined amount of time after the reservation of finishing 20M_ch_a (first channel) corresponding to the 40M STA_1 that sends terminal, and section began only to utilize the 20-MHz frequency band to communicate by 20M_ch_a at the fixed time in the past.

Figure 15 is the chart that the situation of wherein abandoning transmitting after the reservation step of 20M_ch_b is overtime is described.Figure 16 illustrates that a third embodiment in accordance with the invention wherein begins the chart of the situation of 20-MHz communication after the reservation step of 20M_ch_b is overtime.

With reference to Figure 15,40M STA_1 transmits RTSa by utilizing 20M_ch_a to 40M STA_2, and receives CTSa from 40MSTA_2, thereby successfully keeps 20M_ch_a.Afterwards, 40M STA_1 is keeping waiting for before 40MSTA_2 transmits CTSb by 20M_ch_b.Even if 20M_ch_b keeps busy and still take place overtime 150 and do not keep 20M_ch_b in the past in long-time section, 40M STA_1 stops to keep 20M_ch_b and discharges 20M_ch_a yet as shown in figure 15.Under this kind situation, 40M STA_1 ends the channel reservation step that institute's data that are useful on transmit by NAV cancellation 151, and communicating by letter between termination and the 40M STA_2.Afterwards, 40M STA_1 at it by retreating again to obtain the data that next communication opportunity does not transmit maintenance before winning to the competition of obtaining channel and other terminal.

Suppose the shared same timeout value of 40M STA_1 and 40M STA_2.In addition, the possibility that clashes of the CTSb that also exists the NAV cancellation that transmits by 40M STA_2 based on the not idle judgement of 20M_ch_b to transmit by 40MSTA_2 with judgement based on the 20M_ch_b free time.

Although do not have to show, if 20M_ch_b keeps busy and take place overtime in long-time section past back and successfully do not keep 20M_ch_b, 40M STA_2 can discharge 20M_ch_a.That is, 40M STA_2 transmits the NAV cancellation.In addition, after overtime, 40M STA_2 can transmit the frame that is used to ask to transmit the NAV cancellation to 40M STA_1.When receiving this frame, 40M STA_1 transmits the NAV cancellation.According to this method, 40M STA_2 always at first transmits frame according to the supervision result of 20M_ch_b, even the accuracy of timer is low like this, also cannot take place to overlap mutually between the frame.

With reference to the Figure 16 that interrelates with the third embodiment of the present invention, if even the 20M_ch_b maintenance is busy and successfully do not keep 20M_ch_b in long-time section back generation in the past overtime 150, situation 40M STA_1 as shown in Figure 15 stops to keep 20M_ch_b, but keeps guaranteeing rather than discharging 20M_ch_a.After overtime 150,40M STA_1 only communicates 152 by 20-MHz band utilization 20M_ch_a and 40M STA_2.Under this kind situation, the transfer rate during the 40-MHz of transfer rate Billy usefulness 20M_ch_a and 20M_ch_b communicates by letter is low, but 40M STA_1 can not end to transmit data with communicating by letter of 40M STA_2.

It is overtime and can not keep 20M_ch_b that the timer that other terminal that receives the RTSa/CTSa exchange between 40M STA_1 and the 40M STA_2 by 20M_ch_a can be utilized as each self terminal setting detects 40M STA_1.Therefore each terminal can be discerned 40M STA_1 and begin 20-MHz communication 152 to substitute 40-MHz communication, and speed and length according to being stored in the head of 20-MHz Frame that the destination address that transmits from 40M STA_1 is 40M STA_2 will be updated to the length that is used for 20-MHz communication by the NAV that is used for 40-MHz communication that each terminal has set in advance.Therefore, even what 40M STA_1 was planned at first to carry out changes into 20-MHz communication from 40-MHz communication, aforesaid operations also can be avoided a conflict when other terminal transmits frame, and prevents between 40M STA_1 and 40M STA_2 to communicate by letter with 20-MHz and disturb.

In addition, NAV length can be according to the lasting field that is included in the MAC head, rather than changes according to being stored in the speed and the length that are sent to the PHY head of 20-MHz Frame of 40M STA_2 from 40MSTA_1.This point is equally applicable to the situation of HCCA described below.

<HCCA>

Hereinafter will be described to the situation of the scheme of each terminal distribution medium access right by inquiry scheme execution the 40M/20M MIMO AP as the base station in the network such as HCF controlled access (HCCA).

In above-mentioned second embodiment, if ignore the fact that 20M_ch_a has been retained, even after past long-time period, the Frame of 40-MHz channel still can not be transmitted, because 40M STA_1 obtains the round cost plenty of time of carrying out inquiry by 20M_ch_b, just, if 40MSTA_1 does not receive the inquiry frame by 20M_ch_b in the predetermined amount of time after receiving CTS by 20M_ch_a, 40M STA_1 just judges overtime, and transmits NAV release frame to discharge the transmission illegal state owing to the RTS/CTS realization of 20M_ch_a by 20M_ch_a.

As a comparison, a third embodiment in accordance with the invention, if 20M_ch_b keeps busy state after keeping 20M_ch_a, and even take place overtime and can not successfully keep 20M_ch_b in the back in the past in long-time section, as situation at above-mentioned EDCA, 40M STA_1 realizes successfully that to it 20M_ch_a that keeps communicates by only utilizing, and discharges 20M_ch_a and interrupt communication itself to substitute.

Figure 17 is used to illustrate that 40M STA_1 wherein is owing to it is not provided at the chart that the inherent 20M_ch_b of time-out time goes up the situation that round of carrying out inquiry abandons transmitting.Figure 18 is used to illustrate that 40M STA_1 wherein only begins the chart of the situation of 20-MHz communication when it is not provided at the round of carrying out inquiry in the time-out time on 20M_ch_b.

With reference to Figure 17,40M STA_1 utilizes 20M_ch_a to transmit RTSa 170 to 40M STA_2, and is being the inquiry frame of 40M STA_1 by wait after 40M STA_2 reception CTSa 171 successfully keeps 20M_ch_a by the AP_b transmission destination address of 20M_ch_b from BSS_b.Yet as shown in figure 17, misfit from the wait period 172 of 40M STA_2 received frame and the time that sends the inquiry frame from AP_b if in 40M STA_1, be used for, and 40M STA_1 experiences overtime 173 and do not receive any inquiry frame, and then 40M STA_1 stops to guarantee 20M_ch_b and discharges 20M_ch_a.Under this kind situation, 40M STA_1 finishes to be used for all channels that data transmit by NAV cancellation 174 and keeps steps, and the communicating by letter of termination and 40M STA_2.Afterwards, 40M STA_1 at it by retreating again to obtain the data that next communication opportunity does not transmit maintenance before winning to the competition of obtaining 20M_ch_a and other terminal.

With reference to the Figure 18 that interrelates with third embodiment of the invention, if 20M_ch_b keeps busy and even 40M STA_1 experiences overtime 173 and also do not receive any inquiry frame in long-time section in the past, situation as shown in Figure 17,40M STA_1 stops to keep 20M_ch_b, but keeps guaranteeing rather than discharging 20M_ch_a.After overtime 173,40M STA_1 only utilizes its 20M_ch_a that has successfully kept is communicated 180 by 20-MHz frequency band and 40M STA_2.Under this kind situation, the transfer rate during the 40-MHz of Billy usefulness 20M_ch_a and 20M_ch_b communicates by letter though transfer rate becomes is low, and 40M STA_1 can not end to transmit data with communicating by letter of 40M STA_2.In addition, it is overtime and can not obtain conveyer meeting by 20M_ch_b that other terminal that receives the RTSa/CTSa exchange between 40M STA_1 and the 40M STA_2 by 20M_ch_a timer that can be utilized as terminal setting separately detects 40M STA_1.Therefore, each terminal can be discerned 40M STA_1 and carry out 20-MHz communication 180 substituting 40-MHz communication, and is updated to according to being used for of being stored in that speed and length the head of 20-MHz Frame that the destination address that transmits from 40M STA_1 is 40M STA_2 will be set in advance NAV that 40-MHz communicate by letter and is used for the length that 20-MHz communicates by letter.Therefore, even 40M STA_1 changes into 20-MHz communication from the 40-MHz that is planned at first to carry out communication, aforesaid operations can be avoided a conflict when other terminal transmits frame, and prevents between 40M STA_1 and 40M STA_2 to communicate by letter with 20-MHz and disturb.

According to the 3rd embodiment of the invention described above, even all 40M frequency bands can not be guaranteed when the communication that utilizes the 40M frequency band begins, communication still can be undertaken by utilizing the 20M frequency band that has kept in advance at least.Remain on idle condition and avoid waste any frequency band with can preventing the long-time section of 20M_ch frequency band like this.

According to foregoing description, obvious the 3rd embodiment can with first embodiment execution that combines, and can be equally and second embodiment execution that combines.When the 3rd embodiment combines with second embodiment, after first channel is retained, sends terminal and send the claim frame that request transmits the inquiry frame to the inquiry control terminal.When the response frame that receives corresponding to this claim frame, send terminal wait and receive the inquiry frame.Under this kind situation, when receiving the inquiry frame, obtain the transmission permission if send terminal, this terminal has the second channel executive communication of second frequency band by utilization.Even if this terminal did not still receive any inquiry frame from control terminal after the past scheduled time of finishing since the reservation of first channel, then this terminal begins to utilize the communication of first channel with first frequency band.

Realize other advantage and modification easily for the those skilled in the art in present technique field.Therefore, the present invention its widely various aspects be not limited to shown in this paper and described detail and representational embodiment.Correspondingly, can carry out various modifications and do not deviate from the spirit and scope of the overall inventive concept that limits by attached claim and equivalent thereof.

Claims (27)

1. a Wireless Telecom Equipment is characterized in that, comprising:

The first physical layer protocol processing unit that the physical layer protocol that is configured to utilize one first channel in two first channels or another first channel in two first channels to carry out radio communication is handled, each described first channel has first bandwidth;

Be configured to utilize have and carry out the second physical layer protocol processing unit that the physical layer protocol of radio communication is handled greater than second bandwidth of described first bandwidth and with the second channel that described two first channels overlap;

Be configured to manage the carrier sense state of described one first channel and judge whether described one first channel satisfies the condition managing device of the specified conditions of judging idle condition;

Be configured to when the result of determination of the described specified conditions that receive the satisfied judgement of described one first channel of indication idle condition from described condition managing device, just control and state that described one first channel will be taken first frame of first scheduled time slot by virtual carrier sensing in wireless network communication, and make the described first physical layer protocol processing unit transmit the first control device of this first frame to produce; With

Be configured to carry out control and discharge the 3rd frame of described second channel by virtual carrier sensing in wireless network communication, and make the described second physical layer protocol processing unit transmit the second control device of described the 3rd frame to produce;

Described first control device further is configured to produce second frame of described another first channel of statement with occupied second scheduled time slot, and makes described first physical layer protocol processing unit or the described second physical layer protocol processing unit transmit described second frame after transmitting described first frame.

2. equipment as claimed in claim 1 is characterized in that, described second frame comprises the head that can be decoded by the receiving terminal that only be utilized described another first channel to carry out radio communication.

3. equipment as claimed in claim 1 is characterized in that, described first control device be configured to carry out control so that the described second physical layer protocol processing unit after transmitting described second frame by utilizing described second channel to begin switching frame.

4. equipment as claimed in claim 1 is characterized in that, further comprises:

Be configured to carry out control and utilize the 4th frame of the communication period end of described second channel, and make the described second physical layer protocol processing unit transmit the 3rd control device of described the 4th frame with the generation statement.

5. equipment as claimed in claim 1 is characterized in that, described first scheduled time slot is the needed period of frame turnaround sequence subsequently.

6. equipment as claimed in claim 1 is characterized in that, thereby further comprises and be configured to form the part of network and control the described first physical layer protocol processing unit and utilize described one first channel to transmit the network system management device of network attribute.

7. equipment as claimed in claim 1 is characterized in that, further comprises being configured to form the part of network and only accepting the network system management device that network connects control by described one first channel.

8. equipment as claimed in claim 1, it is characterized in that, further comprise being configured to measure first utilization rate of described one first channel and second utilization rate of described second channel, and based on the control of this first and second utilization rate by utilize described one first channel carry out radio communication period length and by utilizing described second channel to carry out the channel status management devices of length of the period of radio communication.

9. equipment as claimed in claim 1, it is characterized in that, described first control device is configured to carry out control and switches to the instruction of described second channel so that described first frame comprises from described one first channel, and makes the described first physical layer protocol processing unit transmit described first frame.

10. equipment as claimed in claim 4, it is characterized in that, described the 3rd control device is configured to carry out control so that described the 4th frame comprises the instruction that switches to described one first channel from described second channel, and makes the described second physical layer protocol processing unit transmit described the 4th frame.

11. equipment as claimed in claim 1 is characterized in that, when one of described first channel was maintained in the described idle condition preassigned fixedly period, described condition managing device was judged the specified conditions that satisfy described judgement idle condition.

12. equipment as claimed in claim 1, it is characterized in that, when one of described first channel is maintained at preassigned fixedly period in the described idle condition and during period of determining by pseudo random number, described condition managing device is judged the specified conditions that satisfy described judgement idle condition.

13. equipment as claimed in claim 1, it is characterized in that, the carrier sense state of described two first channels of described condition managing device management and the carrier sense state of described second channel, and judge based on one of carrier sense state of current described two first channels that are used for radio communication whether described one first channel satisfies the specified conditions of described judgement idle condition.

14. equipment as claimed in claim 13 is characterized in that, the carrier sense state that described condition managing device will obtain by the carrier sense state in conjunction with described two first channels is as the carrier sense state of described second channel.

15. equipment as claimed in claim 1 is characterized in that

Wherein said first frame and described second frame respectively comprise the particular frame that is used to keep described one first channel or described another first channel and

If judge that wherein described another first channel is retained after described one first channel is kept by particular frame, then described first control device makes described first physical layer protocol processing unit or the described second physical layer protocol processing unit transmit data.

16. a wireless communications method is characterized in that, comprising:

Manage the carrier sense state of one first channel in two first channels that respectively have first bandwidth, and judge whether described one first channel satisfies the specified conditions of judging idle condition;

When described one first channel satisfies the described specified conditions of described judgement idle condition, produce described one first channel of statement and will be taken first frame of first scheduled time slot, and transmit described first frame by described one first channel by virtual carrier sensing in wireless network communication;

Produce another first channel of statement and will be taken second frame of second scheduled time slot, and after transmitting first frame, transmit described second frame by described another first channel by virtual carrier sensing in wireless network communication; With

Produce statement and have the 3rd frame that the second channel that overlaps greater than second bandwidth of described first bandwidth and with two first channels will be discharged by virtual carrier sensing in wireless network communication, and transmit described the 3rd frame by described second channel.

17. method as claimed in claim 16, it is characterized in that, further comprise: produce the 4th frame that statement utilizes the communication period end of second channel, and transmitting the 4th frame by described second channel, described second channel has greater than second bandwidth of described first bandwidth and with described two first channels and overlaps.

18. method as claimed in claim 16 is characterized in that,

Described first frame and described second frame respectively comprise the particular frame that is used to keep described one first channel or described another first channel, and further comprise:

After keeping described one first channel and described another first channel, utilize to have greater than second bandwidth of described first bandwidth and the second channel transmission data that overlap with described two first channels.

19. method as claimed in claim 18 is characterized in that,

Transmit by the frame that transmits on described one first channel of terminal monitors;

When described one first channel is in idle condition preset time section, keep described one first channel by utilizing the exchange between transmission terminal and purpose terminal of described one first channel to transmit request/transmission request-reply frame;

By receiving described another first channel of purpose terminal monitors that transmits claim frame by described one first channel; With

When described another first channel was in the idle condition predetermined periods, described purpose terminal kept described another first channel by utilizing described another first channel to transmit the request-reply frame.

20. method as claimed in claim 19 is characterized in that, further comprises:

Allow described transmission terminal to use described another first channel by utilizing described another first channel to transmit the inquiry frame from the inquiry control terminal of managing described another first channel.

21. method as claimed in claim 19 is characterized in that, further comprises:

After keeping described one first channel, the claim frame that request is transmitted the inquiry frame is sent to the inquiry control terminal from described transmission terminal; With

Described transmission terminal is just waited for when the response frame that receives corresponding to the described request frame received described inquiry frame; With

Wherein when obtaining to transmit permission, transmitting described inquiry frame data by receiving.

22. method as claimed in claim 21 is characterized in that, further comprises if the reception wait state of response frame lasts till surpassing scheduled time slot, the channel that then will be used for transfer of data changes to described one first channel from described second channel.

23. method as claimed in claim 19 is characterized in that, further comprises:

Make the inquiry control terminal carry out the inquiry control that is used for transmitting the inquiry frame of permission according to the inquiry scheduling to described transmission terminal;

Described transmission terminal is transmitted comprise that request transmits the transmission claim frame of the solicited message of described inquiry frame from described inquiry control terminal;

Make described transmission terminal from the response message of described inquiry control terminal reception corresponding to described request information; With

Described transmission terminal is waited for when the response message that receives corresponding to described request information received described inquiry frame; With

Wherein when obtaining to transmit permission, transmitting described inquiry frame data by receiving.

24. method as claimed in claim 23, it is characterized in that, comprise that further the channel that then will be used for transfer of data changes to described one first channel from described second channel if last till corresponding to the reception wait state of the response message of described request information and to surpass scheduled time slot.

25. method as claimed in claim 20 is characterized in that, further comprises:

Make described transmission terminal calculate the predetermined time of reception that receives the inquiry frame from described inquiry control terminal;

Calculating is used to keep delivery time of transmission claim frame of described another first channel so that receive described inquiry frame at as calculated predetermined time of reception;

When described another first channel is in the idle condition predetermined periods, begin to keep this channel by utilizing described another first channel between described transmission terminal and purpose terminal, to exchange to transmit request/transmission request-reply frame and from the described delivery time; With

Wherein when obtaining to transmit permission, transmitting described inquiry frame data by receiving.

26. method as claimed in claim 19 is characterized in that, described transmission terminal is carried out

Detection finish the passing that keeps the scheduled time behind described one first channel and

Through described scheduled time the time, only utilize described one first channel to begin communication.

27. method as claimed in claim 20 is characterized in that, described transmission terminal is carried out

Detection finish the passing that keeps the scheduled time behind described one first channel and

If do not receive the inquiry frame that transmits from described control terminal during through the scheduled time, then only utilize described one first channel to begin communication.

Images