CN101309130B - Wireless communication apparatus and method - Google Patents
Wireless communication apparatus and method Download PDFInfo
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- CN101309130B CN101309130B CN2008100992618A CN200810099261A CN101309130B CN 101309130 B CN101309130 B CN 101309130B CN 2008100992618 A CN2008100992618 A CN 2008100992618A CN 200810099261 A CN200810099261 A CN 200810099261A CN 101309130 B CN101309130 B CN 101309130B
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Abstract
A wireless communication apparatus having a wireless communication function capable of using a plurality of transmission rates. The wireless communication apparatus includes utilization-factor calculation means for calculating a utilization factor of a wireless transmission path through which wireless communication is performed using the wireless communication function; and determination means for determining a transmission rate at least on the basis of the utilization factor calculated by the utilization-factor calculation means.
Description
The cross reference of related application
The present invention comprises and relates separately to the Japanese patent application JP 2007-129520 that submits to Japan Patent office on May 15th, 2007 and on March 4th, 2008 and the theme of JP 2008-053134, by reference its full content is incorporated in this.
Technical field
The present invention relates to be used for method of wireless communication, equipment and stored program program recorded medium.More particularly, the present invention relates to be used for and selectivity to use the wireless communication system of multiple transfer rate to determine the method for transfer rate, and relate to Wireless Telecom Equipment and the stored program program recorded medium that is used to carry out this method according to the transmission quality of wireless propagation path.
Background technology
In the last few years, since such as the installation site of equipment than the advantage the high-freedom degree, therefore the wireless network such as the WLAN (local area network (LAN)) of propositions such as IEEE (Institute of Electrical and Electric Engineers) 802.11 extensively distributes to be substituted with spider lines.In addition, such as the various application programs of application program of handling Large Volume Data (for example, image etc.) and so on frequent access network.As a result, for WLAN, need high transmission rates, therefore need further improve throughput.
In order to realize such target, IEEE 802.11 makes and can use multiple transfer rate in physical layer (PHY layer), and selects optimal communication rate (this transfer rate control is called link circuit self-adapting) according to the variation of practical communication environment.For example, as shown in Figure 1,, then change the transfer rate that is used in the network, so that satisfy practical communication environment (with reference to the solid line among the figure) if the practical communication environment changes (with reference to the dotted line among the figure).
As a result, for example, when the transmission theme of wireless communications path (below, abbreviate " transmission quality " as) when good, select high transmission rates to realize high-throughput, and if transmission quality is bad, then select low transfer rate (that is to say mistake proofing (error-resistant) transfer rate).Correspondingly, the accessibility of transmission data is improved, and therefore, the throughput of time per unit (transmission amount of information) improves.In this, realize every kind of transfer rate by combination according to transfer rate, redundancy modulator approaches such as (antenna amounts under the situation of the communication system of using the MIMO (multiple-input and multiple-output) such as EVC, WiMAX).
Here, can be by various parameter Estimation transmission path quality as choice criteria when selecting transfer rate.For example, proposed wherein according to the system (with reference to Japanese unexamined patent application open No.2004-328652) of the re-transmission state estimation transmission path quality of for example dividing into groups to determine transfer rate.
The configuration of the prior art wireless communication system of transfer rate is determined in Fig. 2 diagram according to the re-transmission state.Fig. 3 is illustrated in the ios dhcp sample configuration IOS DHCP of the AP1 that comprises in this system.
In the prior art Wireless LAN system, under the control of AP 1, by AP1 and one or more STA 2-1,2-2 ..., 2-n (below, be called STA2 under the situation that does not need to distinguish) forms BSS (Basic Service Set).Show communication between each STA 2 by AP1 (in infrastructure mode).
The AP1 (Fig. 3) that forms BSS comprises MAC circuit 11 and 18, PHY circuit 12 and 17, the RF circuit 13 and 16 that corresponds respectively to Tx (transmission) and Rx (reception).In the circuit bank of Tx side, MAC circuit 11 and PHY circuit 12 are respectively to 19 data execution and MAC layer and the corresponding processing of PHY layer that provide from the upper strata.As a result, by conversion (up-convert) signal corresponding on the RF circuit 13, and it is exported from antenna 14 with data.Simultaneously, in the Rx side, the signal by 16 times converting antennas 15 of RF circuit receive experiences and PHY layer and the corresponding processing of MAC in PHY circuit 17 and MAC circuit 18 respectively then, and it is provided to upper strata 19.
Carry out the re-transmission of packet by Tx side MAC circuit 11 and control, and control by transfer rate and re-transmission that MAC circuit 11 is identified for communicating by letter.In this, the method for controlling by the re-transmission of IEEE802.11 definition MAC circuit 11.Whether received the ACK corresponding grouping according to transmission equipment side, made about whether needing determining of retransmitted data packet with the packet that will transmit.
The customized configuration of the MAC circuit 11 of the function that Fig. 4 Display Realization is such.
When transmitted in packets instruction from the upper strata 19 when being input to MAC circuit 11, transmitted in packets part 31 provides by packet (below, being called packet A) this instruction appointment, preservation in data buffer 32 to PHY circuit 12.
At this moment, transmitted in packets parts 31 are provided to PHY circuit 12 with packet A, simultaneously, control sequence management component 33, so as with sequence number W add to be transmitted, be kept at the packet A in the data buffer 32.
In addition, transmitted in packets parts 31 output designation data grouping when the transmission grouping has been sent to the transmitted in packets signal that transfer rate is determined parts 22.
After transmitted in packets parts 31 transmit packet A, ACK receiving-member 34 becomes ACK packet awaits state, that is to say, wait for that the state of wait ACK grouping sign of the ACK grouping of the packet A that is used to transmit that provides from MAC circuit 18 has been provided in indication.In this case, when ACK receiving-member 34 received ACK grouping sign, specified data grouping A had arrived receiver side, and therefore, deletion has the packet of sequence number W from data buffer 32.
On the other hand, if also do not receive ACK grouping sign, then ACK receiving-member 34 is given transmitted in packets parts 31 with this advisory, and has received the packet A that this packets of information transmission part 31 will be kept in the data buffer 32 and offer PHY circuit 12 once more.At this moment, transmitted in packets parts 31 are determined parts 22 output packet retransmissions present signals to transfer rate, and the re-transmission of packet has been finished in its indication.
Simultaneously, determine in the parts 22 processing below packet retransmissions present count signal output block 51 is carried out in transfer rate.
1. when from transmission control element 21 (its transmitted in packets parts 31) when the packet retransmissions present signal is provided, packet retransmissions present count signal output block 51 offers the packet retransmissions present number with the packet retransmissions present count signal and preserves parts 53.
2. when from transmission control element 21 (its transmitted in packets parts 31) when the transmitted in packets signal is provided, packet retransmissions present count signal output block 51 offers the transmitted in packets number with the transmitted in packets count signal and preserves parts 54.
By this way, when when packet retransmissions present count signal output block 51 provides any count signal, the packet retransmissions present number is preserved parts 53 and count the quantity (Y) of the packet that is transmitted and the number of times (X) that packet retransmits during the sampling time section of determining speed, and this quantity is offered error rate calculating unit 55.
As a result, in error rate calculating unit 55, by packet retransmission times (X) is come the mistake in computation rate divided by the number of times of data packet transmission.
Transfer rate determines that parts 56 will be from error rate calculating unit 55 error rate that provides and the threshold that remains on the threshold value preservation parts 57, and the result determines transfer rate based on the comparison, and the set rate information signal is provided to PHY circuit 12.
Particularly, if error rate greater than predetermined threshold D, then transfer rate is determined that parts 56 hypothesis is wrong and is taken place, this is to be aggressive (aggressive) because the transfer rate of current use is compared with the transmission state of wireless path.Therefore, transfer rate determines that parts 56 determine transfer rate is reduced to less than current transfer rate, and will indicate the rate information signal of this situation to offer PHY circuit 12.
In addition, if error rate less than predetermined threshold value U, then transfer rate determines that parts 56 hypothesis can use the transfer rate higher than the transfer rate of current use.Therefore, transfer rate is determined parts 56 definite raising transfer rates, and will indicate the rate information signal of this situation to offer PHY circuit 12.
In addition, if error rate is in threshold value U arrives the scope of threshold value D, then transfer rate determines that the transfer rate of parts 56 definite current uses is suitable, and will indicate the rate information signal of maintenance transfer rate to offer PHY circuit 12.As a result, at PHY circuit 12, change transfer rate according to the rate information signal that provides from MAC circuit 11.That is to say, the modulator approach of the packet that provides from MAC circuit 11 is provided.
In this, here, can carry out transfer rate raise or reduce a phase (phase) (as, be elevated to 18Mbps from 12Mbps), perhaps can carry out transfer rate is raise or reduce two-phase or above (for example, from 12Mbps to 24Mbps) immediately.
Summary of the invention
As mentioned above, in art methods,, that is to say that the re-transmission that whether has packet determines the transmission state of wireless propagation path, that is to say the accessibility of packet by whether having received the ACK grouping.Yet packet can not arrive the reason of receiver side, that is to say that the reason of packet re-transmission is as follows.One of reason is that the transmission quality for wireless communications path uses inappropriate transfer rate (current transfer rate is greater than the transfer rate of actual capabilities under the current state of wireless propagation path).Another reason is to cause packet can not arrive receiver side owing to the packet from other STA 2 transmission clashes.
Yet, in art methods, do not consider the reason of the re-transmission of packet.
Therefore, if use suitable transfer rate about the transmission quality of wireless propagation path, then when by with another packet collisions during retransmitted data packet, it is very high that this transfer rate is assumed to be aggressiveness.Therefore, make and determine to reduce transfer rate.That is to say, in art methods, can not use the wireless propagation path that can initially use effectively sometimes.
Make the present invention according to these situations.Expectation can be used transfer rate according to the transmission quality of wireless propagation path.
According to embodiments of the invention, Wireless Telecom Equipment with the radio communication function that can use multiple transfer rate is provided, comprise: the utilance calculation element is used to calculate and uses radio communication function to carry out the utilance of the wireless propagation path of radio communication by it; With definite device, be used for determining transfer rate based on the utilance of calculating by the utilance calculation element at least.
Utilize this configuration, when determining transfer rate, consider the utilance of wireless propagation path.Usually, if adopt the method for only determining transfer rate according to the various parameters such as number of retransmissions, then whether STA or AP can not discern transmission quality and worsen, or error of transmission do not occur, and this is because owing to packet collisions appears in blocking up of wireless propagation path.On the other hand, the collision rate of grouping is assumed to be the utilance that depends on wireless communications path.If the utilance height, then the reason of error of transmission is that the probability of packet collisions becomes very high.Therefore, by considering the utilance of wireless propagation path, the transfer rate (that is to say the quality of transmission path) that becomes and to select to reflect actual environment.
In this, determine that device can come the calculated data retransmission rate based on the data re-transmission number of times of carrying out under the state of the utilance of being calculated less than threshold value, and can determine transfer rate based on the retransmission rate of being calculated.In addition, in this case, determine that device can calculate retransmission rate by get rid of the number of retransmissions of carrying out the number of times that retransmits from reality under the state of the utilance of being calculated greater than threshold value.
In addition, the communication standard followed of Wireless Telecom Equipment is arbitrarily.Wireless Telecom Equipment can adopt the various communication meanss of definition rate adaptation function, for example IEEE802.11, WiMAX, LTE etc.
In addition, the utilance calculation element can calculate the service time of using wireless propagation path in the scheduled measurement time, and can be by calculated utilance divided by Measuring Time the service time of being calculated.At this moment, calculating the method for service time is arbitrarily.For example, the utilance calculation element can use the duration value (duration value) in forming the MAC head of packet or the signal strength values calculating service time of the length value in the PHY head or rate value or received signal.
In addition, the utilance calculation element can use the channel information that is included in the information element of forming in the received management grouping to calculate service time.
According to embodiments of the invention, be provided at the wireless communications method in the Wireless Telecom Equipment with the radio communication function that can use multiple transfer rate, or store the program recorded medium that makes computer carry out the program of wireless communication process with the radio communication function that can use multiple transfer rate, this method or processing comprise step: calculate and use the utilance of radio communication function by the wireless propagation path of its execution radio communication; At least determine transfer rate based on the utilance of calculating by the utilance calculation procedure.
In Wireless Telecom Equipment according to the present invention, wireless communications method or stored program program recorded medium, calculate by it and use radio communication function to carry out the utilance of the wireless propagation path of radio communication, and at least based on determining transfer rate by the utilance of being calculated.
By the present invention, can use transfer rate according to the transmission state of wireless propagation path.
Description of drawings
Fig. 1 is the diagram of the transition of diagram transfer rate;
Fig. 2 is the block diagram of example of configuration of the Wireless LAN system of diagram prior art;
Fig. 3 is the block diagram of the ios dhcp sample configuration IOS DHCP of the AP1 among diagram Fig. 2;
Fig. 4 is the block diagram of example of the functional configuration of the MAC circuit 11 among diagram Fig. 3;
Fig. 5 is the block diagram that the ios dhcp sample configuration IOS DHCP of Wireless LAN system of the present invention is used in diagram;
Fig. 6 is the diagram of the relation between diagram medium occupancy and the collisions of data packets;
Fig. 7 is the diagram of diagram medium occupancy;
Fig. 8 is the block diagram of ios dhcp sample configuration IOS DHCP of the AP 101 of diagram Fig. 5;
Fig. 9 is the block diagram of example of the functional configuration of the MAC circuit 111 among diagram Fig. 8;
Figure 10 is another diagram of diagram medium occupancy;
Figure 11 is the block diagram of another example of the configuration of the AP 101 among diagram Fig. 5;
Figure 12 is the block diagram of another example of the configuration of the AP 101 among diagram Fig. 5;
Figure 13 is the block diagram of example of the functional configuration of the MAC circuit 111 among diagram Figure 12; With
Figure 14 is the block diagram of the ios dhcp sample configuration IOS DHCP of graphic computer.
Embodiment
Below, will carry out the description of embodiments of the invention.Be illustrated in the specification below or embodiment that describes in the accompanying drawing and composition characteristic of the present invention between relation.This description is used for determining to support that embodiments of the invention are included in specification or accompanying drawing.Correspondingly, be contained in specification or the accompanying drawing but be not included as the embodiment of the embodiment corresponding here, then should the fact not represent that this embodiment did not correspond to composition characteristic of the present invention with composition characteristic of the present invention if exist.On the contrary, if comprise, then should the fact not represent that this embodiment did not correspond to the composition characteristic except that this composition characteristic here as the embodiment corresponding with composition characteristic of the present invention.
The ios dhcp sample configuration IOS DHCP of Wireless LAN system of the present invention is used in Fig. 5 diagram.In this LAN system, in the position of the AP1 of Fig. 2, provide AP 101.Other parts are identical with the situation of Fig. 2.
That is to say that this Wireless LAN system is also deferred to IEEE802.11, and have wherein AP 101 and a plurality of STA 2-1,2-2 ..., the configuration that connects by wireless network of 2-n (omitting the demonstration of STA 2-3 in the drawings) to 2-n.In the physical layer of this system, provide multiple transfer rate.In IEEE802.11b, provide four kinds of transfer rate: 1Mbps, 2Mbps, 5.5Mbps and 11Mbps.In IEEE802.11a/g, provide eight kinds of transfer rate: 6Mbps, 9Mbps, 12Mbps, 18Mbps, 24Mbps, 36Mbps, 48Mbps and 54Mbps.
In this, in the IEEE802.11n that is in now in the standardisation process, plan provides a large amount of higher transfer rates.
The re-transmission of the packet that the packet retransmissions present function on the MAC level that whether has the IEEE802.11 definition is carried out, AP 101 based on the utilance of wireless propagation path (for example, transmitted in packets time rate in this wireless propagation path) (below, is called the medium occupancy) and determines transfer rate.
As mentioned above, not arrive the reason of receiver side as follows in packet.One of reason is that the transmission quality for wireless communications path has used inappropriate transfer rate.Another reason be owing to conflicting of packet cause packet can not arrive receiver side from other STA 2 transmission.Though guarantee transmission quality, if the conflict of packet takes place, then because this conflict and retransmitted data packet.In this case, although guaranteed transmission quality in the reality, unnecessarily reduced transfer rate.Therefore, may select the not match transfer rate of practical communication environment.Therefore, in Wireless LAN system, detect the probability of the conflict of packet, and consider that the probability of collisions of data packets prevents as far as possible because the transfer rate control that collisions of data packets causes by the medium occupancy according to this embodiment.Therefore, adopt the method for determining transfer rate according to the actual transmissions quality.
Especially, the Wireless LAN system as the system that moves according to IEEE802.11 is furnished with the packet collisions protection mechanism by means of CSMA/CA.Therefore correspondingly, between the probability of medium occupancy and collisions of data packets, there is high relevance, can expects correctly to detect probability with collisions of data packets by the medium occupancy.
Relation between the probability of Fig. 6 conceptual illustration medium occupancy and collisions of data packets.
In CSMA/CA system, carry out obtaining of medium (that is to say wireless propagation path) by the probabilistic method that is called random back-off (randombackoff) as IEEE802.11.Therefore, STA 2 and the access classes of obtaining accidentally identical random back-off value may face collisions of data packets.That is to say, shown in the top of Fig. 6, if medium occupancy height then exists a plurality of STA2 or access classes on wireless propagation path.Therefore, when transmitting packet, because the probability of ACK is not returned in conflict and the probability of retransmitted data packet uprises.
On the other hand, shown in the bottom of Fig. 6, if the medium occupancy is low, then the probability with other collisions of data packets is low.Therefore, when not returning the ACK grouping, be likely the reason of having used inappropriate transfer rate.
Fig. 7 is the conceptual illustration of the diagram duration field value that uses the MAC head of packet (below be called duration value) medium occupancy.
The duration value transmission right (transmission right) owner that is used for IEEE802.11 definition at the third party's terminal outside the transmission destination transmission is set and forbids part (below be called NAV), and the holding time (that is to say, obtain the time period of transmission right) of indication wireless propagation path.In this, value is the value that the MAC head by the received packet of decoding obtains the duration.
In the example of Fig. 7, obtain the grouping 1,2 that in the particular measurement time T, receives respectively and 3 duration value (p, q and r).The total value of these values (that is to say the All Time section) is used for the service time (that is to say the holding time section) of the wireless propagation path of Measuring Time T.Therefore, by total value is obtained medium occupancy (expression formula (1)) divided by Measuring Time T.
The medium occupancy=(p+q+r)/T ... (1)
The ios dhcp sample configuration IOS DHCP of Fig. 8 diagram AP 101.AP 101 is furnished with the MAC circuit 11 that MAC circuit 111 replaces the AP 1 of Fig. 3, and value is extracted parts 112 be furnished with the duration.Those of the AP 1 of other parts and Fig. 3 are identical, therefore will suitably the descriptions thereof are omitted.
Duration value is extracted parts 112 from the extracting data MAC head that the MAC circuit 18 of Rx side obtains, and simultaneously, is worth the duration of the extraction from the MAC head, and the duration value of being extracted is offered MAC circuit 111.
By this way, provide the rate information signal of indicating determined transfer rate to PHY circuit 12, and determine transfer rates by PHY circuit 12 from MAC circuit 111.
The example of the functional configuration of Fig. 9 diagram MAC circuit 111.In this, in Fig. 9, give components identical with the Reference numeral identical with the Reference numeral of Fig. 4.Therefore, unless describe in addition, the element with Reference numeral identical with each element shown in Figure 4 has identical configuration and carries out identical processing.In addition, " the utilance calculation element " in claims takies calculating unit 211 corresponding to the medium of for example Fig. 9, and definite device is determined parts 202 corresponding to transfer rate for example shown in Figure 9.
As shown in Figure 9, MAC circuit 111 is furnished with transfer rate and determines that parts 202 replace the transfer rate of the MAC circuit 11 among Fig. 4 to determine parts 22, and is furnished with packet collisions estimation section 201.
In these elements, packet collisions estimation section 201 use from the duration value extract that parts 112 provide the duration value calculating wireless propagation path during Measuring Time T holding time, and pass through holding time divided by Measuring Time T calculation medium occupancy (expression formula 1).
In addition, packet collisions estimation section 201 detects the probability of collisions of data packets based on the medium occupancy of being calculated.If packet collisions estimation section 201 is determined the probability height, then packet collisions estimation section 201 will indicate this true packet collisions estimated signal to offer transfer rate to determine parts 202.
In order to realize such function, packet collisions estimation section 201 has the medium that comprises accumulation parts 221 and calculating unit 222 and takies calculating unit 211 and threshold value comparing unit 212.Accumulation parts 221 be accumulated in during the Measuring Time T from the duration value extraction parts 112 duration values that provide, and with the value that obtained during the Measuring Time T as a result of (p+q+r in the example among Fig. 7), just the holding time section of wireless propagation path offers calculating unit 222.
Next, to determine the mode that parts 22 are identical with the transfer rate of Fig. 4, transfer rate determining unit 202 is based on transmitted in packets signal and packet retransmissions present calculated signals error rate from transmission control element 21, simultaneously, determine transfer rate based on the packet collisions estimated signal that provides from packet collisions estimation section 201.
In order to realize these functions, except with independent component components identical shown in Figure 4, transfer rate determines that parts 202 also have packet retransmissions present count signal output block 231.
In the mode identical with the packet retransmissions present count signal output block 51 of Fig. 4, when when transmission control element 21 provides the packet retransmissions present signal, packet retransmissions present count signal output block 231 offers the packet retransmissions present number with the packet retransmissions present count signal and preserves parts 53.Here, as mentioned above,, then cause that based on the setting of the transfer rate that retransmits transfer rate selects not match with the practical communication quality if cause the appearance of packet retransmissions present by packet collisions.Therefore, for determining that parts 202 provide the packet retransmissions present that takes place during the time period of packet collisions estimated signal from transfer rate, need hypothesis by causing re-transmission with conflicting of other packet, and from getting rid of this re-transmission the number of retransmissions as the standard of transfer rate.
Therefore, if provide the packet collisions estimated signal (to that is to say from packet collisions estimation section 201, the reason that retransmits is estimated as conflict), then the packet retransmissions present count signal output block 231 according to present embodiment stops the packet retransmissions present count signal is offered packet retransmissions present number preservation parts 53.
As a result, in error rate calculating unit 55, from will be as getting rid of the number of times that is assumed to be the re-transmission that is caused by conflict the number of retransmissions (X) of the reference of mistake in computation rate, and transfer rate determines that parts 56 can determine the actual transmission quality of transfer rate coupling.Thus, can prevent to occur the change of transfer rate owing to conflict.
In this, can carry out here with transfer rate rise with descend one mutually (as, be elevated to 18Mbps from 12Mbps), perhaps can carry out transfer rate is raise or reduce two-phase or above (for example, from 12Mbps to 24Mbps) immediately.
As mentioned above, by AP 101, based on the probability of medium occupancy detection with collisions of data packets according to this embodiment.The packet of getting rid of from the calculating of error rate when having high probability retransmits, and therefore can determine suitable transfer rate according to the actual mass of transmission path.
Therefore, if use suitable transfer rate, then, do not count this re-transmission for the calculating of mistake when owing to the time with other collisions of data packets retransmitted data packet at the transmission quality of wireless propagation path.Therefore, do not make determining of reduction transfer rate.That is to say, can use original available wireless propagation path effectively.
In this, more than, by adopting AP 101 to determine that the situation of transfer rate is described as example.Yet the present invention can also be applied to STA 2.In this case, except determining the transfer rate, can realize the present invention by the configuration identical with the ios dhcp sample configuration IOS DHCP of above-mentioned AP 1 by STA 2.Therefore, with omissions of detail
In addition, more than, as shown in Figure 7, the Measuring Time section is assumed to be the time period of each Measuring Time T.Yet, as shown in figure 10, can determine the Measuring Time section by mobile predetermined amount of time S (it is shorter than Measuring Time T).That is to say that the time period of window width that can be by having time T is determined the Measuring Time section.
In addition, more than, if the medium occupancy exceeds threshold value once, then export the packet collisions estimated signal.Yet,, can export the packet collisions estimated signal if the medium occupancy exceeds the threshold value pre-determined number continuously.
In addition, the threshold value that can will compare with the medium occupancy according to the dynamic change of quantity of the STA 2 that in BSS, registers.This is because the probability of collisions of data packets increases with the number of nodes of registering.
In addition, if there is the equipment that uses the 40MHz bandwidth on adjacent channel, then the threshold value that can compare with the medium occupancy is set to, and for example, very high numeral is so that be difficult to output packet collisions estimated signal.Use the beacon of the equipment transmission 40MHz frequency band of 40MHz bandwidth.Can detect the equipment that has use 40MHz frequency band by detecting beacon.
In addition, more than, the duration value of use MAC head is calculated the holding time of the wireless propagation path during Measuring Time T.Yet, can be in length field and the speed field in the PHY head of decode data packet after the detection of packet, obtain block length (byte number) from those values then, and use transfer rate at that time that this value is converted to the time period, so that calculate holding time.
The example of the configuration of AP 101 when Figure 11 diagram comes the calculation medium occupancy when the value calculating holding time by length field from the PHY head of grouping and speed field.In AP 101, provide the duration value among the AP 101 that block length calculating unit 113 replaces Fig. 8 to extract parts 112.Those of other parts and Fig. 8 are identical, therefore will suitably the descriptions thereof are omitted.
Block length calculating unit 113 extracts the PHY head by the packet of PHY circuit 17 decodings, and extracts the value (below be called length value and rate value) of length field and speed field from the head.
Block length calculating unit 113 calculates block length based on length field of being extracted and speed field, and by transfer rate at that time block length is converted to the time period, and will offer the packet collisions estimation section 201 of MAC circuit 111 time period.
To be input to the accumulation parts 221 that medium takies calculating unit 211 with the block length time corresponding section that offers packet collisions estimation section 201.Accumulation parts 221 pass through this Time Calculation holding time of accumulation during Measuring Time T.
As mentioned above, calculating unit 222 and threshold value comparing unit 212 offer the packet collisions estimated signal packet retransmissions present count signal output block 231 that transfer rate is determined parts 202 suitably.
In addition, can measure signal strength signal intensity when received signal and be particular value or the time period when higher, and can during Measuring Time T, accumulate this time period and calculate holding time.
Figure 12 diagram is when the example of the configuration of AP 101 when calculating holding time from signal strength signal intensity and come the calculation medium occupancy.In AP 101, provide RSSI to extract parts 114 and extract parts 112 with the duration value of the AP 101 of replacement Fig. 8.Those of other parts and Fig. 8 are identical, therefore will suitably the descriptions thereof are omitted.
RSSI extracts in the received signal of parts 114 from be input to RF circuit 16 and extracts RSSI (signal strength indicator that receives), and provides it to MAC circuit 111.
Figure 13 is illustrated in the example of the functional configuration of MAC circuit 111 under the situation of this example.The packet collisions estimation components 201 of MAC circuit 111 is furnished with accumulation parts 251 and replaces accumulation parts 221 among Fig. 9.
The RSSI that provides from RSSI extraction parts 114 is imported into accumulation parts 251.Accumulation parts 251 relatively extract RSSI and the predetermined threshold that parts 114 provide from RSSI.During Measuring Time T,, in Measuring Time T, calculate holding time, and holding time is offered calculating unit 222 when the time period of RSSI during greater than threshold value.
As mentioned above, calculating unit 222 and threshold value comparing unit 212 are provided to the packet collisions estimated signal packet retransmissions present count signal output block 231 that transfer rate is determined parts 202 rightly.
In addition, except the above embodiments, can use the management grouping (wireless measurement report) that defines among the current IEEE802.11k that is designing.IEEE802.11k is designing so that report the standard of the information of PHY/MAC level (level) as far as possible.For example, STA (or AP) can ask other STA (or AP) to measure and report following project.
In the scope at this station about the AP number of particular channel or all channels.
2. the intensity of the beacon signal of each AP.
3. the frame number that in special time period, receives, receive all of this frame, received frame number and the average signal strength of each transmission sources.
4. the operation level of WLAN in each channel.
In each channel except that WLAN, the radio operation from transmitting such as the mobile phones that may disturb 802.11 devices or the device the microwave oven.
6. waiting for the average delay that takes place between transmission period, failed transmission number, statistics such as detected fcs error in received frame.
7. the signal length of the request source platform of measuring by request purpose platform.
8. other position.
9.PHY the frame statistical information (number of the power that for example, receives, the antenna number of use and institute's use antenna, PHY type etc.) of level.
10. the BSS of adjacent AP sets up information (for example, TSF Counter Value, BSSID, vendor information).
Share above measurement result between the STA that in the management grouping, describes or between AP and STA.Between the IE corresponding (information element) with measurement result, the STA number that on channel, exists of indication and the line is busy rate (busy rate) below, and can use these IE to determine medium holding time T.
A. channel loading (IE indication CCA holding time rate statistics)
B. noise block diagram (power that IE indication receives during NAV, just STA's exists probability)
In addition
C.STA statistics (IE indication transmission and packets-received counter and retransmission counter) can be used for calculating the error rate of grouping.
Therefore, can be included in the selection that these IE that manage in the grouping realize suitable transfer rate by use.
In addition, can or can carry out above-mentioned a series of processing by software by hardware.When carrying out a series of processing by software, the program of forming software is built in the specialized hardware of computer.Alternatively, for example on can carrying out, various programs are installed from the general purpose personal computer of the various functions of program recorded medium.
Figure 14 is the block diagram of the ios dhcp sample configuration IOS DHCP of the diagram computer hardware of carrying out above-mentioned a series of processing.
In computer, CPU (CPU) 501, ROM (read-only memory) 502, RAM (random access memory) 503 interconnect by bus 504.
Input/output interface 505 is also connected to bus 504.Comprise keyboard, mouse, microphone etc. input block 506, comprise display, loud speaker etc. output block 507, comprise hard disk, nonvolatile memory etc. memory unit 508, comprise the communication component 509 of network interface etc. and be used for driving the driver 510 that can unload medium 511 (such as disk, CD, magneto optical disk or semiconductor memory etc.) and be connected to input/output interface 505.
In having the computer of above-mentioned configuration, the CPU 501 for example institute's program stored in memory unit 508 is loaded into RAM 503 by input/output interface 505 and bus 504, with executive program, carries out above-mentioned a series of processing thus.
Will be recorded in by the program that computer (CPU 501) is carried out and can unload in the medium 511, it is the encapsulation medium that comprises such as disk (comprising floppy disk), CD (comprising CD-ROM (compact disk read-only memory), DVD (digital versatile disc) etc.), magneto optical disk or semiconductor memory etc.Alternatively, can provide program by the wired or wireless transmission such as local area network (LAN), internet, digital satellite broadcasting.
Can be attached to driver 510 and come program to be installed in memory unit 508 by unloading medium 511 by input/output interface 505.In addition, can be by wired or wireless transmission by communication component 509 reception programs, and it is installed in the memory unit 508.In addition, can be installed in program among the ROM 502 in advance or in the memory unit 508.
In this, the program of being carried out by computer can be the program of handling in chronological order according to the described order in this specification.In addition, this program can be a program parallel or that carry out with the timing of necessity (such as in the invoked time etc.).
It should be appreciated by those skilled in the art that according to design needs and other factors and can carry out various modifications, combination, sub-portfolio and change, and they all fall in the scope of appended claims and equivalent thereof.
Claims (7)
1. Wireless Telecom Equipment with the radio communication function that can use multiple transfer rate comprises:
The utilance calculation element is used to calculate and uses radio communication function to carry out the utilance of the wireless propagation path of radio communication by it; With
Determine device, be used for determining transfer rate based on the utilance of calculating by the utilance calculation element at least, wherein
Determine that device comes the calculated data retransmission rate based on the data re-transmission number of times of carrying out under the state of the utilance of being calculated less than threshold value, and determine transfer rate based on the retransmission rate of being calculated.
2. Wireless Telecom Equipment as claimed in claim 1, wherein
Determine that device calculates retransmission rate by get rid of the data re-transmission number of times of carrying out the number of times that retransmits from reality under the state of the utilance of being calculated greater than threshold value.
3. Wireless Telecom Equipment as claimed in claim 1, wherein
Radio communication function is carried out the radio communication of following IEEE802.11.
4. Wireless Telecom Equipment as claimed in claim 1, wherein
The utilance calculation element calculates the service time of using wireless propagation path in the scheduled measurement time, and by calculated utilance divided by Measuring Time the service time of being calculated.
5. Wireless Telecom Equipment as claimed in claim 4, wherein
The utilance calculation element uses duration length value in value or the PHY head and the signal strength values of rate value or received signal in the MAC head of forming packet to calculate service time.
6. Wireless Telecom Equipment as claimed in claim 4, wherein
The utilance calculation element uses the channel information in the information element that is included in the management grouping to calculate service time.
7. wireless communications method in Wireless Telecom Equipment with the radio communication function that can use multiple transfer rate, the method comprising the steps of:
Calculate and use radio communication function to carry out the utilance of the wireless propagation path of radio communication by it; With
At least determine transfer rate based on the utilance of calculating by the utilance calculation procedure, wherein
Determine that the step of transfer rate comes the calculated data retransmission rate based on the data re-transmission number of times of carrying out under the state of the utilance of being calculated less than threshold value, and determine transfer rate based on the retransmission rate of being calculated.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007129520 | 2007-05-15 | ||
| JP129520/07 | 2007-05-15 | ||
| JP053134/08 | 2008-03-04 | ||
| JP2008053134A JP5146739B2 (en) | 2007-05-15 | 2008-03-04 | Wireless communication apparatus and method, and program |
Publications (2)
| Publication Number | Publication Date |
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| CN101309130A CN101309130A (en) | 2008-11-19 |
| CN101309130B true CN101309130B (en) | 2011-07-27 |
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| CN2008100992618A Expired - Fee Related CN101309130B (en) | 2007-05-15 | 2008-05-15 | Wireless communication apparatus and method |
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| JP (1) | JP5146739B2 (en) |
| CN (1) | CN101309130B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2381627B1 (en) * | 2009-01-08 | 2018-09-19 | Mitsubishi Electric Corporation | Data transmission device |
| US9571225B2 (en) | 2009-07-08 | 2017-02-14 | Google Technology Holdings LLC | Method and apparatus for optimizing target error rates for link adaptation in a communication system |
| JP5419091B2 (en) * | 2010-03-31 | 2014-02-19 | 国立大学法人電気通信大学 | Communication apparatus and method, and program |
| JP5463194B2 (en) * | 2010-04-22 | 2014-04-09 | Ｋｄｄｉ株式会社 | Congestion degree estimation device, congestion degree estimation method, and control program |
| US8804590B2 (en) | 2010-12-20 | 2014-08-12 | Panasonic Corporation | Apparatus, method and implementation for adaptable wireless beacon communication system |
| US9609520B2 (en) | 2011-01-14 | 2017-03-28 | Qualcomm Incorporated | Methods and apparatuses for communicating in television white space (TVWS) based on TVWS enablement signal |
| US9107078B2 (en) | 2011-01-14 | 2015-08-11 | Qualcomm, Incorporated | Methods and apparatuses for low-rate television white space (TVWS) enablement |
| US9100967B2 (en) * | 2011-09-16 | 2015-08-04 | Qualcomm Incorporated | System, method and apparatus for allocating wireless channels in a multi-channel access point |
| JP2015019230A (en) * | 2013-07-10 | 2015-01-29 | パナソニックＩｐマネジメント株式会社 | Communication terminal and program |
| CN103986554A (en) * | 2014-04-21 | 2014-08-13 | 深圳市九二一云网络科技有限公司 | Quick and smooth transmission rate switching method and system for mobile device |
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| CN1781289A (en) * | 2003-04-30 | 2006-05-31 | 摩托罗拉公司 | Wireless communication unit and method for power saving |
| CN1894986A (en) * | 2003-10-31 | 2007-01-10 | 美商内数位科技公司 | Adaptive radio resource management for wireless local area networks |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5146739B2 (en) | 2013-02-20 |
| JP2008312194A (en) | 2008-12-25 |
| CN101309130A (en) | 2008-11-19 |
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