CN101010900A - A method and system for link adaptation in wireless networks - Google Patents
A method and system for link adaptation in wireless networks Download PDFInfo
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- CN101010900A CN101010900A CNA2005800293162A CN200580029316A CN101010900A CN 101010900 A CN101010900 A CN 101010900A CN A2005800293162 A CNA2005800293162 A CN A2005800293162A CN 200580029316 A CN200580029316 A CN 200580029316A CN 101010900 A CN101010900 A CN 101010900A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
- H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- Quality & Reliability (AREA)
- Artificial Intelligence (AREA)
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- Probability & Statistics with Applications (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Small-Scale Networks (AREA)
Abstract
A method and system of adapting the transmission rate, with the capability of determining whether a transmission error is caused lay increased path loss, of a mobile station among a plurality of transmission rates between a plurality of stations in a wireless local area network (WLAN) are provided. In response to a transmission time out condition of a transmitted frame, a determination is made whether a transmission error associated with the time out condition was caused by increased path loss using a Received Signal Strength (RSS) value from a plurality of incoming frames received by a mobile station. If the determination is true, an RSS threshold is increased, for example, a link adaptation rate threshold, and the frame is retransmitted.
Description
The present invention relates to communication system.More particularly, the present invention relates to a kind of be used for utilizing since increase path loss caused wrong and because disturb and mistake that conflict is caused between difference revise transmission rate so that regulate the system and method for the transmission rate at each station of wireless network more accurately, described wireless network such as IEEE 802.11 WLAN (wireless local area network) (wireless local area network WLAN).
IEEE 802.11 standards are wireless lan (wlan) regulation medium access control (medium access control MAC) and physical characteristic so that support physical layer element.In the 1999 international standard ISO/IEC 8802-11 " Information Technology-Telecommunications and Information Exchange Area Networks " that publish, defined IEEE 802.11 standards, its full content has been introduced for your guidance at this.
IEEE 802.11 physical layers (Physical Layers PHY) have defined a plurality of transmission rates according to different modulation and channel coding schemes, make the transmitter of frame to select one of a plurality of speed at receiver and the wireless channel situation between self in specific time basis.Usually, transmission rate is low more, transmits reliable more.
In this wireless system, propagate and interference environment since such as station mobility, the time exsiccation disturbing and conflicting factor and change with the space in time.As a result, there is not the single PHY pattern of optimum (modulation and encoding mechanism) in all cases.Advised that link circuit self-adapting (Link adaptation LA) algorithm relaxes this problem, wherein makes modulating mode optimally be suitable for the usefulness that current link condition is improved system by modification.
In particular, the specific examples of LA algorithm makes dispatching station can revise transmission rate by using received signal intensity (ReceivedSignal Strength RSS) as the link-quality index, and the signal strength signal intensity of described reception measures from the frame that access point (access point AP) is received according to it.Do not considering SNR/SIR owing under the situation of interference or multichannel decay and fluctuation rapidly, suppose that RSS and SNR on average have linear relationship.Therefore, as the power that is received of the function of distance and path loss conditions concerning estimation the PHY pattern of suitable coupling be very useful to be used for next transmission.In Application No. XXXXXXXX co-pending in the lump, described this link circuit self-adapting algorithm, be introduced into for your guidance at this.
The variation of RSS shows that the condition of Radio Link changes between station and AP, and may since between described station and AP bigger distance or higher path loss and correspondingly be necessary to revise transmission rate.Yet prior art LA adaptive algorithm is supposed described mistake all the time owing to low RSS causes, thereby may carry out self adaptation improperly.
For example, other error source that is occurred in wireless radio channels is the interference noise in receiving station, conflict and multichannel decay in receiving station.Since other station on same channel and the interference behavior (as microwave) that other transmitting apparatus caused almost be pulsed and be of short duration.The LA algorithm should be for by disturbing or conflicting caused error of transmission and revise its speed and do not change the RSS threshold value in this case.In view of the above, for needing to distinguish owing to hang down wrong and because the mistake that interference is caused that RSS (big distance) is caused according to providing dynamic rate adaptive LA algorithm from the measured received signal intensity (RSS) of institute's received frame.
The present invention relates to that a kind of utilization can be distinguished because that the path loss that increases (because distance increases), decay and high path loss are caused is wrong and owing to disturb and the ability of the mistake that conflict is caused is revised transmission rate so that regulate the system and method for transmission rate better in wireless network, described wireless network is such as wireless lan (wlan).
One aspect of the present invention relates to a kind of method that is used for the transmission rate of definite a plurality of transmission rate mobile radio stations, and described method comprises step: from measured average received signal strength (RSS) value by a plurality of incoming frames that described mobile radio station received; Described average RSS value is compared with being scheduled to master meter, and described master meter has with the desired minimum RSS of one of a plurality of transmission rates specific frame length of transmission; And the new transmission rate of selecting described mobile radio station according to described comparative result is to be used for transmitting new frame subsequently, wherein in response to the overtime condition of the transmission of transmit frame; Use average RSS value to determine whether the error of transmission that is associated with described overtime condition is caused by the path loss that increases; If the new transmission rate of selecting described mobile radio station so is to be used for transmitting new frame subsequently.
Another aspect of the present invention relates to and a kind ofly is used for determining that whether error of transmission causes method with the transmission rate that is used for determining a plurality of transmission rate mobile radio stations, for example link circuit self-adapting algorithm by the path loss that increases.Said method comprising the steps of: in response to the overtime condition of the transmission of transmit frame; Received signal intensity (RSS) value of a plurality of incoming frames that the next free described mobile radio station of use is received determines whether the error of transmission that is associated with described overtime condition is caused by the path loss that increases; If, increase the RSS threshold value so, link circuit self-adapting rate-valve value for example, and retransmit described frame; And if not, retransmit described frame so.
Another aspect of the present invention relates to a kind of system of revising the link circuit self-adapting transmission rate of the mobile radio station among a plurality of transmission rates, and comprising: acceptor circuit is used for the demodulation incoming frame; Power-measuring circuit, the received signal intensity (RSS) of the incoming frame that is used to measure wherein and is received; Be coupled to the processor of described power-measuring circuit, be used for determining the overtime condition of transmission of institute's transmit frame and received signal intensity (RSS) value of a plurality of incoming frames that the next free described mobile radio station of use is received come definite error of transmission that is associated with described overtime condition whether to be caused by the path loss that increases, and if increase the RSS threshold value so and retransmit described frame or send new frame.
Another aspect of the present invention relates to a kind of system that determines transmission rate described in a plurality of transmission rates, comprises acceptor circuit, is used for the demodulation incoming frame; Power-measuring circuit, the received signal intensity (RSS) of the incoming frame that is used to measure wherein and is received; Be coupled to the processor of described power-measuring circuit, be used to calculate average RSS and according to selecting new transmission rate to be used to transmit new frame with the comparative result of predetermined master meter, described predetermined master meter comprises with the desired minimum RSS of one of a plurality of described transmission rates specific frame length of transmission, wherein, use described average RSS to determine whether the error of transmission that is associated with described overtime condition is caused by the path loss that increases in response to the overtime condition of the transmission of transmit frame; If the new transmission rate of selecting described mobile radio station is so transmitted new frame subsequently or is retransmitted described frame being used for; With the memory that is coupled to described processor, be used to store described predetermined master meter and described average RSS to be used for obtaining subsequently.
According to the more detailed description of looking like illustrated preferred embodiment in the accompanying drawing down, above-mentioned and other feature and advantage of the present invention will be clearer, wherein spread all over each view Reference numeral and refer to identical part.
Fig. 1 is the simplified block diagram that is used to illustrate the architecture of the wireless communication system of using the embodiment of the invention;
Fig. 2 illustrates the simplified electrical circuit diagram at access point in specific Basic Service Set (BSS) and each station according to the embodiment of the invention;
Fig. 3 is the graphic extension that is used to regulate the transmission benchmark of transmission rate according to the embodiment of the invention; With
Fig. 4 be used for according to embodiment of the invention diagram distinguish since increase path loss caused wrong and because disturb and mistake that conflict is caused so as to regulate transmission rate the flow chart of operating procedure.
Though following system block diagram with particular reference to Fig. 1 has been described the present invention, yet be to be understood that in description subsequently and can adopt the mode of other foundation structure to use just communicate by letter with another station via wireless medium in one of them station according to equipment of the present invention and method.
Fig. 1 illustrates the representative network of using embodiments of the invention.As shown in Figure 1, access point (AP) 2 is coupled to a plurality of mobile radio station (STA
i) 10, described mobile radio station (STA
i) 10 communicate with one another and communicate by letter with described AP via Radio Link.Key principle of the present invention is not consider receiver performance and channel behavior, and the frame error probability depends on signal to noise ratio (snr), its transmission rate and the length thereof at receiver.On an average, sending STA can be by grasping from relatively estimating path loss and channel behavior by receiving the measured RSS of frame that STA sent.Notice that in typical IEEE 802.11 STA implementations, RSS can be used for medium access control (MAC) agreement.Thereby, use fixing transmission power level for it all transmission as long as receive STA, so just can use the variation of RSS to be provided for producing and upgrade transmission-rate reference to be used for subsequently transmission frame so that make the mechanism that frame is just in time sent with correct transmission rate.
With reference to Fig. 2, the AP in the WLAN of Fig. 1 and each STA can comprise the system with illustrated architecture in the block diagram of Fig. 2.AP and STA can comprise receiver 12, demodulator 14, power-measuring circuit 16, memory 18, processor controls 20, timer 22, modulator 24 and transmitter 26.Although this description may relate to the term that is generally used for describing specific mobile radio station, yet this description and principle are equally applicable to other treatment system, comprise the system that has with in different architecture shown in Fig. 2.It is microprocessor, central processing unit, computer, circuit card, application-specific integrated circuit (ASIC) (application-specificintegrated circuit ASIC) that processor 20 can be represented.Memory 18 can be represented promptly based on the optics of dish or the part or the combination of magnetic cell, electronic memory and these and other memory device.Yet can replace in other embodiments, or use hardware to be used to realize the present invention in conjunction with software instruction.
In the operation, receiver 12 and transmitter 26 are coupled to the antenna (not shown), send into the corresponding digital data via demodulator 14 signal that 24 conversions are received with modulator and the data of being wanted respectively.Power-measuring circuit 16 is operated under the control of processor 20 so that detect the RSS of institute's received frame on it.Estimated and be stored in the memory 18 about the RSS at other station, described memory 18 is coupled to processor 20 and obtains subsequently being used for.Be updated and be used to produce master meter after a while about the RSS of the estimation at other station in the identical BSS, described master meter is used to select correct transmission rate.Timer 22 is used for eliminating expired RSS estimation, and it is stored in the memory 18.In this embodiment, when RSS trends towards potential mobility owing to the time variation matter of wireless channel and WLAN STA and changes, upgrade RSS.
For instance, Fig. 3 represents to be used to select the transmission master meter of suitable transmission rate.Send when having the frame of length-specific and receiving corresponding confirmation signal whenever sending STA, send STA and produce according to RSS measured in master meter or upgrade threshold boundaries to be used for transmission frame subsequently.In case be that different frame each (for example, 0-100 byte, 100-1000 byte and 1000-2400 byte) at interval set up the RSS threshold boundaries, send STA so and revise transmission rate from receiving the measured RSS of STA institute's received frame according to it.Notice that the variation of RSS shows that the condition of Radio Link between transmission STA and reception STA changes.As shown in Figure 3, the threshold boundaries of each shows which is the desired minimum RSS value of specific transmission PHY speed.For example, if one is monitoring that the STA that comes from by the RSS that receives the frame that STA sent detects described RSS and becoming and be lower than one of threshold value (promptly, because the distance that increases between reception STA and transmission STA causes), next transmission attempt may be to carry out so that guarantee received frame correctly than low rate so.
Be employed variable list in Fig. 3-4 below:
| I | The subscript of data rate | F: speed=1,2,5.5,11} (Mbps)=and 1,2,3,4} |
| J | The subscript of frame length | G: length j={0-100,100-1000,1000-2400} (bytes)=1,2,3} |
| LA_th [i，j] | The link circuit self-adapting rate-valve value | 0＜I＜5&0＜j＜4 |
| RSS | The signal length that receives is measured recently | |
| RSS_avg | The average received signal length |
In brief, the frame length interval, j={1,2,3} represents different frame signs respectively: 0-100 byte, 100-1000 byte and 1000-2400 byte.Data rate i={1,2,3,4} is illustrated in one of four available data rate in this example, described four data speed promptly 1,2,5.5 and 11Mbps.For each defines the RSS threshold value at interval.Threshold value " LA_th[i, j] " represent to be worth with the minimum " RSS_avg or RSS threshold value " of data rate " i " transmit frame in length interval " j ".
Fig. 4 illustrate be used for distinguishing (1) because wrong and (2) that the path loss that increases (because the distance that increases), decay and high path loss are caused because disturb and mistake that conflict is caused so that adjust the overall operation of the transmission rate of wireless network.
Usually, mobile unit is configured to operation (step 100) in two patterns: (1) receiving mode; (2) sending mode.STA sends request signal so that send data, selects transmission rate according to average (RSS_avg) threshold value of RSS, frame sign and number of retransmission attempts then.Here, when carrying out modifying rates from the measured average RSS of the frame that receives during by some threshold values the master meter, described master meter comprises the desired minimum RSS value of specific transmission rate.After this, STA comes transmit frame with selected transmission rate.Depend on described transmission whether success and frame mistake be by disturb, conflict causes or because path loss is caused that STA upgrades in the master meter " threshold value " accordingly.Thereby STA attempts selecting transmission rate according to RSS_avg, frame length and repeating transmission.Notice that this block diagram illustrates at 802.11 STA according to the operation of the Basic Service Set among Fig. 4, sends or therefrom receive all frames to its AP all the time in this case.Thereby mentioned here reception STA is its AP all the time.
When transmission STA transmission had the frame of length-specific, it received corresponding confirmation signal (that is, confirming (ACK) frame).When the confirmation of receipt signal, it shows that transmission rate is suitable.If do not receive the confirmation signal in the given time, occur the overtime condition of confirmation signal (step 102) so.Under overtime condition, determine that in step 104 whether described mistake is caused by the performance (for example RSS is too low) of receiver.If be false, determine that so wrong reason for example is interference, conflict, multipath etc.For example, overtime condition (step 102) occurring afterwards, determining in step 104 whether the variation of received signal intensity (RSS) in scheduled time slot has surpassed a certain RSS threshold value.
Can calculate RSS over time according to following equation, that is, and Δ RSS/ Δ t: Δ RSS/ Δ t:=RSS_avg-RSS_actual.
In the determining of step 104, along with the variation of RSS during the specific period increases, owing to also can increase at the too low probability of mistake that causes of the RSS of receiver.In addition, it shows that described mistake takes place owing to the performance (PER) of receiver and owing to causes in the low-power of receiver.Thereby, increase RSS threshold value/link circuit self-adapting rate-valve value (LA_th[i] [j]) in step 108, then after calculating optimal data rate in step 106 retransmit frames, as shown in Figure 5.If step 104 determine show RSS during the specific period not or very little variation (for example when comparing with predetermined threshold) arranged, so owing in the conflict of receiver or mistake appears in interference and channel condition can be very not high by the probability of variation.Thereby, under the situation that in link circuit self-adapting rate-valve value (LA_th[i] [j]), does not have to change, in step 106 retransmit frames.Should be noted that and utilize each the repeating transmission, collision probability is lower, thereby those skilled in the art can determine various different retransmission threshold rates for various different conditions.
In Fig. 5,, select transmission rate in step 120.In step 122, check the highest possible transmission rate in the LA_th table, if for example (RSSI_avg＞=LA_th (I) is (J)) is false, select new (higher) speed so.Otherwise in step 124, use selected speed.
As can be seen from the above, the present invention just just increases the RSS threshold value in the mistake relevant with channel (for example not upgrading in conflict or after disturbing) afterwards owing to be different from prior art.Just (after the grouping at predetermined number) just revises transmission rate after the associated change of RSS or long the interference.In addition, the present invention can select suitable transmission rate under the situation of current IEEE 802.11 WLAN medium access control standards not being made any change.
Though illustrated and described the preferred embodiments of the present invention, yet it will be appreciated by those skilled in the art that and under the situation that does not break away from true scope of the present invention, to make various changes and modification and can replace its element with equivalent.In addition, under the situation of off center scope not, can make many modifications so that be suitable for particular case of the present invention and instruction.Therefore, the invention is intended to be not limited to be reserved as realize the disclosed specific embodiment of best mode of the present invention, but the present invention includes all embodiment that fall in the claims scope.
Claims (16)
1. method that is used for revising the link circuit self-adapting transmission rate of a plurality of transmission rate wireless devices, described method comprises step:
(a) in response to the overtime condition of transmission of the frame that sends; Use comes from received signal intensity (RSS) value of a plurality of incoming frames that received by described wireless device and determines whether the error of transmission that is associated with described overtime condition is caused by the path loss that increases; And
(b) if increase the RSS threshold value so and retransmit described frame or send new frame.
2. the method for claim 1 further comprises if the error of transmission that is associated with described overtime condition is not caused by the path loss that increases, and retransmits described frame so or sends the step of new frame.
3. the method for claim 1, wherein step (a) further comprises step: from being measured average received signal strength (RSS_avg) value by a plurality of incoming frames that described wireless device received, and determine whether the variation of described received signal intensity in scheduled time slot has surpassed predetermined value.
4. the method for claim 1, wherein said RSS threshold value is the link circuit self-adapting rate-valve value.
5. method as claimed in claim 3, if wherein RSS is over time greater than predetermined value, the error of transmission that is associated with described overtime condition is caused and increase described RSS threshold value by path loss so.
6. the method for claim 1 wherein sends described incoming frame by access point (AP).
7. the method for claim 1 wherein sends described incoming frame by another wireless device.
8. method that is used for determining the transmission rate of a plurality of transmission rate wireless devices, described method comprises step:
(a) from measure average received signal strength (RSS) value by a plurality of incoming frames that described wireless device received;
(b) described average RSS value is compared with being scheduled to master meter, described master meter has with the desired minimum RSS of one of a plurality of transmission rates specific frame length of transmission;
(c) select the new transmission rate of described wireless device to be used for transmitting new frame subsequently, wherein according to described comparative result
(d) in response to the overtime condition of the transmission of transmit frame; Use average RSS value to determine whether the error of transmission that is associated with described overtime condition is caused by the path loss that increases; And
(e) if the new transmission rate of selecting described wireless device is so transmitted new frame subsequently or is retransmitted described frame being used for.
9. wireless device that is used for revising a plurality of transmission rate link Adaptive Transmission speed comprises:
Acceptor circuit is used for the demodulation incoming frame;
Power-measuring circuit, the received signal intensity (RSS) of the incoming frame that is used to measure wherein and is received;
Be coupled to the processor of described power-measuring circuit, be used for determining whether the next definite error of transmission that is associated with described overtime condition of the overtime condition of transmission of institute's transmit frame and received signal intensity (RSS) value that use comes from a plurality of incoming frames that received by described wireless device is caused by the path loss that increases, and if increase the RSS threshold value so and retransmit described frame or send new frame.
10. wireless device as claimed in claim 9, wherein said processor further comprise if the error of transmission that is associated with described overtime condition is not caused by the path loss that increases, retransmit described frame so or send new frame.
11. wireless device as claimed in claim 9, wherein processor further comprises according to determining average received signal strength (RSS_avg) value by a plurality of incoming frames that described wireless device received, and whether the definite variation of described received signal intensity in scheduled time slot has surpassed predetermined value.
12. wireless device as claimed in claim 9, wherein said RSS threshold value is the link circuit self-adapting rate-valve value.
13. wireless device as claimed in claim 10, if wherein RSS is over time greater than predetermined value, the error of transmission that is associated with described overtime condition is caused and increase described RSS threshold value by the path loss that increases so.
14. wireless device as claimed in claim 9 wherein sends described incoming frame by access point (AP).
15. wireless device as claimed in claim 9 wherein sends described incoming frame by another wireless device.
16. a wireless device that is used for the transmission rate of definite a plurality of transmission rates comprises:
Acceptor circuit is used for the demodulation incoming frame;
Power-measuring circuit, the received signal intensity (RSS) of the incoming frame that is used to measure wherein and is received;
Be coupled to the processor of described power-measuring circuit, be used to calculate average RSS and according to selecting new transmission rate to be used to transmit new frame with the comparative result of predetermined master meter, described predetermined master meter comprises with the desired minimum RSS of one of a plurality of described transmission rates specific frame length of transmission, wherein, use described average RSS to determine whether the error of transmission that is associated with described overtime condition is caused by the path loss that increases in response to the overtime condition of the transmission of transmit frame; If the new transmission rate of selecting described wireless device is so transmitted new frame subsequently or is retransmitted described frame being used for; With
Be coupled to the memory of described processor, be used to store described predetermined master meter and described average RSS to be used for obtaining subsequently.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60562004P | 2004-08-30 | 2004-08-30 | |
| US60/605,620 | 2004-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101010900A true CN101010900A (en) | 2007-08-01 |
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|---|---|---|---|
| CNA2005800293162A Pending CN101010900A (en) | 2004-08-30 | 2005-08-24 | A method and system for link adaptation in wireless networks |
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| Country | Link |
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| EP (1) | EP1787418A1 (en) |
| JP (1) | JP2008512024A (en) |
| KR (1) | KR20070041591A (en) |
| CN (1) | CN101010900A (en) |
| WO (1) | WO2006024993A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107683570A (en) * | 2015-05-29 | 2018-02-09 | 三星电子株式会社 | Method and apparatus for sending and receiving data in mobile communication system |
| US10237776B2 (en) | 2016-01-13 | 2019-03-19 | Sercomm Corporation | Method for controlling transmission rate and WLAN device using the same |
| CN112425242A (en) * | 2018-07-12 | 2021-02-26 | 诺基亚技术有限公司 | Hybrid macro diversity and cooperative relay method for ultra-reliable real-time multi-user communication |
| CN112954461A (en) * | 2021-02-08 | 2021-06-11 | 四川天邑康和通信股份有限公司 | Method for testing wireless power of set top box and fusion gateway based on intelligent integration |
| CN113891393A (en) * | 2021-09-24 | 2022-01-04 | 北京升哲科技有限公司 | Link self-adaptive transmission method, device, equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008012954A1 (en) * | 2006-07-27 | 2008-01-31 | Panasonic Corporation | Wireless communication apparatus, wireless lan system, interference detecting method, and interference avoidance method |
| US7872974B2 (en) | 2007-09-27 | 2011-01-18 | Freescale Semiconductor Inc. | System and method for handling or avoiding disruptions in wireless communication |
| EP2272214B8 (en) * | 2008-04-28 | 2016-08-10 | Hewlett-Packard Enterprise Development LP | Adjustable server-transmission rates over fixed-speed backplane connections within a multi-server enclosure |
| WO2016203296A1 (en) * | 2015-06-19 | 2016-12-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Selecting link adaptation or collision avoidance in wireless local area networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7095719B1 (en) * | 2000-06-20 | 2006-08-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for dynamic packet selection in uncoordinated radio systems |
| US6915477B2 (en) * | 2001-12-28 | 2005-07-05 | Lucent Technologies Inc. | Delay sensitive adaptive quality control loop for rate adaptation |
| US7143320B2 (en) * | 2001-12-31 | 2006-11-28 | Intel Corporation | Increasing data throughput on a wireless local area network in the presence of intermittent interference |
| US7388903B2 (en) * | 2002-09-18 | 2008-06-17 | Conexant, Inc. | Adaptive transmission rate and fragmentation threshold mechanism for local area networks |
-
2005
- 2005-08-24 CN CNA2005800293162A patent/CN101010900A/en active Pending
- 2005-08-24 KR KR1020077004368A patent/KR20070041591A/en not_active Application Discontinuation
- 2005-08-24 EP EP05781240A patent/EP1787418A1/en not_active Withdrawn
- 2005-08-24 JP JP2007529092A patent/JP2008512024A/en not_active Withdrawn
- 2005-08-24 WO PCT/IB2005/052776 patent/WO2006024993A1/en not_active Application Discontinuation
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107683570A (en) * | 2015-05-29 | 2018-02-09 | 三星电子株式会社 | Method and apparatus for sending and receiving data in mobile communication system |
| CN107683570B (en) * | 2015-05-29 | 2021-04-02 | 三星电子株式会社 | Method and apparatus for transmitting and receiving data in mobile communication system |
| US10237776B2 (en) | 2016-01-13 | 2019-03-19 | Sercomm Corporation | Method for controlling transmission rate and WLAN device using the same |
| CN112425242A (en) * | 2018-07-12 | 2021-02-26 | 诺基亚技术有限公司 | Hybrid macro diversity and cooperative relay method for ultra-reliable real-time multi-user communication |
| CN112954461A (en) * | 2021-02-08 | 2021-06-11 | 四川天邑康和通信股份有限公司 | Method for testing wireless power of set top box and fusion gateway based on intelligent integration |
| CN113891393A (en) * | 2021-09-24 | 2022-01-04 | 北京升哲科技有限公司 | Link self-adaptive transmission method, device, equipment and storage medium |
| CN113891393B (en) * | 2021-09-24 | 2023-05-05 | 北京升哲科技有限公司 | Link self-adaptive transmission method, device, equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20070041591A (en) | 2007-04-18 |
| WO2006024993A1 (en) | 2006-03-09 |
| JP2008512024A (en) | 2008-04-17 |
| EP1787418A1 (en) | 2007-05-23 |
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