CN1756252A - WLAN multi-rate self-adaptive transmission method - Google Patents

WLAN multi-rate self-adaptive transmission method Download PDF

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CN1756252A
CN1756252A CN 200410051692 CN200410051692A CN1756252A CN 1756252 A CN1756252 A CN 1756252A CN 200410051692 CN200410051692 CN 200410051692 CN 200410051692 A CN200410051692 A CN 200410051692A CN 1756252 A CN1756252 A CN 1756252A
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frame
transmission
rate
transmission rate
current
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CN 200410051692
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CN100574318C (en
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李峰
马凤国
孙波
高音
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025Transmission of mode-switching indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026Transmission of channel quality indication

Abstract

The invention provides a multiple-speed self-adaptive transmission method of wireless local network, relating to the data transmission technology of wireless local network. Said method comprises: the receiver and the transmitter interchanges the information of transmission speed or the information relative to the transmission speed in the process of communication; according to aforementioned information, individually regulating the present transmission speed; transmitting data according to the regulated transmission speed, while the regulation of transmission speed and the confirming of information relative to the transmission speed in the communication process are avoided in the communicating stations without interfering present communication. Said method can meet the high speed mobile wireless decline channel, which can select the optimum transmission speed according to the demand of service quality of transmission service and the frame length of transmission data, for improving the total property of network.

Description

一种无线局域网多速率自适应传输的方法 A wireless LAN multi-rate adaptive transmission method

技术领域 FIELD

本发明涉及无线局域网的数据传输技术,尤其涉及一种无线局域网多速率自适应传输的方法。 The present invention relates to a wireless LAN data transmission technology, and particularly relates to a method of adaptive multi-rate wireless LAN transmission.

背景技术 Background technique

无线局域网通常是基于载波侦听多址协议CSMA的,其改进方式有:信道分裂预约多址接入SRMA(split-channel reservation multiple access)、冲突避免多址接入协议MACA(multiple access with collision avoidance)、改进的冲突避免多址接入协议MACAW、底部获取多址接入协议FAMA(floor acquisition multiple acess)和802.11等协议,本发明所指的无线局域网一般都是基于CSMA协议。 Wireless LAN is usually based on carrier sense multiple access protocol CSMA, the improvement methods are: split channel reservation multiple access SRMA (split-channel reservation multiple access), multiple access with collision avoidance protocol MACA (multiple access with collision avoidance ), improved multiple access protocol with collision avoidance the MACAW, obtaining multiple access protocol FAMA (floor acquisition multiple acess) and 802.11 protocols such as the bottom, the present invention refers to wireless local area networks are generally based on CSMA protocol. 在无线局域网中进行多速率传输需要解决的主要问题是:传输业务类别、信道质量估计和速率选择。 The main problem for multi-rate transmission in a wireless local area network need to be addressed are: transmission business category, channel quality estimation and rate selection. 传输业务按对时延要求通常可以分为时延敏感和非时延敏感两大类业务,按对耐错误能力通常可以分为耐错和非耐错两大类业务。 According to delay requirements for transmission traffic typically delay-sensitive and can be divided into two major categories of non-delay-sensitive services, according to the error resistant ability generally can be divided into non-error tolerance and error tolerance two categories of business. 信道质量估计主要是以信噪比、信号强度、误比特率、误符号率或误帧率的统计作为判决测度来衡量信道的传输质量。 Channel quality estimation mainly noise ratio, signal strength, bit error rate, symbol error rate or a frame error rate statistics to measure the transmission quality measurement decision channel.

在无线局域网中,现行的速率选择方法目前主要有两种:一种是“自动速率应变(Auto Rate Fallback)协议”,另一种是“基于接收机的自动速率(Receiver Based Auto Rate)协议”。 In wireless LAN, the current rate selection methods There are mainly two: one is "Automatic strain rate (Auto Rate Fallback) protocol", and the other is "automatic rate based on the receiver (Receiver Based Auto Rate) protocol" .

自动速率应变协议是由艾迪.卡莫曼等人提出的,其核心思想是,以前面传输的成功和失败次数为依据来调整传输速率。 Automatic strain rate agreement proposed by Eddie. Kamo Man et al., The core idea is to transfer the success and failures in front of a basis to adjust the transmission rate. 这实际是一种依误帧率的速率调整体制,当站点间成功传输一定次数后,认为信道质量可靠进而逐级提高传输速率;反之,如果站点间传输失败,则认为信道质量下降而逐级降低传输速率。 It is actually a system by adjusting the rate of the frame error rate, when a certain number of successful transmission between sites considered reliable channel quality further progressively increase the transmission rate; the other hand, if the transmission failure between sites that decrease the channel quality stepwise reduce the transmission rate. 根据该协议同一次传输过程中各帧的传输速率是不变的,因此多速率传输不会引起持续时间的变化,在站点间信道变化缓慢时,较为适用。 According to this protocol with a transmission rate of each frame in the first transmission process it is constant, and therefore does not cause a change in the multi-rate transmission duration, between sites when a channel changes slowly, it is applicable.

基于接收机的自动速率协议是由盖文.荷兰德、奈廷.魏德亚和帕偌沃巴尔提出的,其核心思想是在MAC帧头的持续时间子域中插入该帧的发送速率和帧长。 Automatic rate based on the protocol by the receiver Gavin. Holland, Naiting. Weide Ya Pa Norwich Wo Baer and forth, its core idea is inserted into the frame duration of the sub-frame header field MAC transmission rate and frame length . 传输初始时,用于接入的发送请求从基本速率集中选择合适的速率发送,随后接收站点将根据接收信号估计信道质量信息,自适应地调整发送速率,发送站点以和接收站点返回的确认帧发送速率相同的速率发送下一数据帧,不参与通信的站点则根据接收信号中包含的数据发送率和帧长,即时修正网络分配矢量。 Initial transmission, transmits an access request to select the appropriate rate of transmission set from the base rate, then the receiving station channel quality information, the transmission rate is adaptively adjusted according to the received signal estimate, an acknowledgment frame to the transmitting station and the receiving station returns the same transmission rate next data frame transmission rate, the communication station is not involved in the data transmission rate and the frame length contained in the received signal, a network allocation vector immediate correction.

除了以上两种多速率传输协议,无线局域网中还有一种双信道时隙ALOHA多速率传输协议,该协议采用独立的控制信道用于传输速率的设置,由于占用信道资源过多,故实际中很少使用。 In addition to the above two multi-rate transmission protocols, wireless local area network there is a two-channel slotted ALOHA multi-rate transmission protocol uses a separate channel is provided for the transmission rate, because too many resources occupy the channel, it is in practice less use.

自动速率应变协议和基于接收机的自动速率协议的缺点是,不能在网络中存在多种业务时优化速率的选择,不适用于高速移动无线衰落信道。 Strain protocol and disadvantages of automatic rate based on receiver automatic rate protocol is selected when multiple services can not exist in the network optimization rate, does not apply to high-speed fading mobile radio channels. 不同类别的业务对误码特性、时延的要求是不同的,传输过程中无线信道和传输数据帧长也是变化的。 Different classes of service characteristics for error, delay requirements are different, and the radio channel transmission process to transmit data frame length also varies. 通常时延敏感业务对错误的容忍能力高,非时延敏感业务对误码或误帧性能要求比较高,上述现有协议没有综合考虑这些与传输速率相关的因素。 High tolerance typically delay-sensitive services for errors, non-delay-sensitive service or error frame for error performance requirements are relatively high, the above-described conventional protocol is not associated with these factors taken into account transmission rate. 另外,自动速率应变协议不适用于无线移动信道环境,因为在无线移动信道中,信道质量的变化较快,信道的相关时间短,以数次成功或失败的数据传输间隔作为信道质量统计时间窗时间太长,从而使得信道质量统计不可靠,传输吞吐率下降。 Further, automatic rate strain protocol is not available for a wireless mobile channel environment, because of changes in mobile radio channels, channel quality fast, short correlation time of the channel to several success or failure of data transmission intervals as the channel quality statistics time window time is too long, so that the channel quality statistics are not reliable, decreased transmission throughput. 基于接收机的自动速率协议克服了自动速率应变协议不能适应无线移动信道的缺点,该协议速率变化实时性强,适用于无线移动信道。 Automatic rate based protocol receiver overcomes the disadvantages automatic rate of strain can not meet the protocol of wireless mobile channel, this protocol and real time rate of change, for wireless mobile channel. 但该协议最主要的缺点是:发送站点总是以接收站点返回的确认帧的发送速率发送数据帧,发送站点或接收站点都不能预先确定自己发送下一帧时的传输速率,因此不能准确设置到整个传输结束时的持续时间,不得不将持续时间字段内容改为发送速率和发送帧长以便不参与通信的站点修正网络分配矢量。 But the main disadvantage of this protocol is: always transmitting station transmits a data frame transmission rate to the receiving station returns an acknowledgment frame, the transmitting station or the receiving station can not transmit its own transmission rate determined in advance during the next frame, thus can not be accurately disposed at the end of the duration of the entire transmission, the duration field contents have changed to a transmission rate and a transmission frame length correction site is not involved in a communications network allocation vector. 无线信道除了有大尺度衰落,同时还存在小尺度衰落,当站点高速移动时,物理信道的信道状态信息变化较快,为了可靠地通信,对传输帧长须有一定限制,一个较长的MAC帧往往要分成多个小段传输。 In addition to large-scale fading radio channel, but also the presence of small-scale fading, when the high-speed mobile station, a physical channel is channel state information changes rapidly, in order to reliably communicate, must have a limit to the transmission frame length, a longer MAC frame into a plurality of small pieces tend to be transmitted. 基于接收机的自动速率协议的网络分配矢量修正方法不仅和现有协议兼容性差,更因为其持续时间字段已不具备对下一帧传输信道占用的预约作用而不适用于多段传输。 A network allocation vector-based method for automatically correcting rate and the protocol of the receiver not only poor compatibility of existing protocols, but also because it does not have the duration field is reserved for the next action frame transmission channel occupancy is not applicable to multi-stage transmission. 另外接收站点返回的确认帧帧长通常远小于发送站点发送的数据帧长,在相同误码率情况下,误帧率随着帧长的加长而增高,以接收站点能可靠返回的确认帧的发送速率发送数据帧,从统计意义上讲并不可靠。 Further the receiving station returns an acknowledgment frame the frame length is typically much smaller than the frame length data transmitting station transmitted at the same bit error rate, frame error rate and increased as the frame length is lengthened, the receiving station can reliably confirm the return to the frame transmission rate data frames are sent from the statistical sense, it is not reliable. 因此该协议不适用于无线高速移动信道,兼容性差。 The protocol thus does not apply to high-speed mobile wireless channel, poor compatibility.

因此,现有技术存在缺陷,而有待于改进和发展。 Thus, the prior art deficiencies, but room for improvement and development.

发明内容 SUMMARY

本发明的目的在于提供一种无线局域网多速率自适应传输的方法,解决了背景技术不能在网络中存在多种业务时优化速率的选择,不适应于无线信道,尤其是不适应于无线高速移动信道的技术问题。 Object of the present invention is to provide a method for multi-rate adaptive transmission of wireless local area network, to solve the optimal rate selection of background art can not exist when multiple services in the network, not adapted to the radio channel, especially suited to a high-speed mobile wireless problem channel.

本发明的技术解决方案是:一种无线局域网多速率自适应传输的方法,其中,该方法包括:收发双方在通信过程中相互交换传输速率信息或与传输速率相关的信息;根据上述传输速率信息或与传输速率相关的信息,分别调整当前传输速率;以及以调整后的当前速率传输数据。 Technical solutions of the present invention is: A method for multi-rate adaptive transmission of wireless local area network, wherein the method includes: sending and receiving sides to exchange information related to the transmission rate information transmission rate during communication with each other; information according to the transmission rate or information related to the transmission rate, respectively, to adjust the current transmission rate; and the current transmission rate adjusted data.

所述的方法,其中,所述与传输速率信息包括:传输当前发送帧速率、接收端确认帧的发送速率和下一个发送帧的估计速率,或传输当前发送帧速率和接收端确认帧的发送速率。 The method of claim, wherein said transmission rate information comprising: a transmission rate of a current transmission frame, the receiver acknowledgment transmission rate is estimated at frame rate and a transmission frame, or transmission of the current transmission rate frame and the receiver acknowledgment transmission frame rate.

所述的方法,其中,所述调整当前传输速率的过程包括:将传输速率分为多个等级,等级越高速率越快,定义最低速率为基本速率;数据帧传输中,站点根据当前发送帧速率发送数据,初始传输当前发送帧速率和接收端确认帧的发送速率并被设置为基本速率。 Said method, wherein said current transmission rate adjustment process includes: the transmission rate into a plurality of levels, the higher level the faster the rate, the lowest rate is defined as the basic rate; data frame transmission, a transmission frame according to the current station transmission data rate, initial transmission of the current transmission rate and the frame rate receiver acknowledges the transmitted frame and arranged to basic rate.

所述的方法,其中,在所述调整当前传输速率的过程中,如果在发送方具有传输速率或与传输速率相关的信息的统计信息,则根据该统计信息选择高于基本速率的速率作为初始传输当前发送帧速率和接收端确认帧的发送速率和当前传输业务类别,传输当前发送帧速率和接收端确认帧的发送速率可以不相等,以能够正确地传送第一个发送帧和返回帧为适合。 The method, wherein, in the adjustment process of the current transmission rate, if the sender has a transmission rate or statistical information related to the transmission rate, a rate substantially higher than the rate selection based on the statistical information as an initial transmission of the current transmission rate and the frame rate receiver acknowledges the transmitted frame and the current transmission traffic classes, the transmission rate of transmission frame and the receiver acknowledgment transmission rate of the current frame may not be equal to the first transmission frame can be transmitted correctly and return frames Suitable for.

所述的方法,其中,在数据帧传输中,接收站点在接收到发送帧后,将当前接收的发送帧中的接收端确认帧的发送速率值作为返回帧的传输当前发送帧速率,以该传输当前发送帧速率发送返回帧。 The method of claim, wherein, in a data transmission frame, the receiving station after receiving the transmission frame, the receiving end sends a frame currently received acknowledgment frame transmission rate as the return value of the transmission frame rate of a current transmission frame to the transmission of the current transmission rate return frame transmission frame.

所述的方法,其中,所述数据帧传输中,如果发送站点仍有帧发送,所述接收站点根据接收的发送帧对信道质量进行统计,计算下一发送帧长,接收方依据当前业务类别对服务质量的要求综合考虑信道质量、下一发传输帧长、信道编码、调制解调方式因素估计出下一发送帧的发送速率,并将该值填入接收端确认帧的发送速率通知发送站点。 The method, wherein the data frame transmission, if the sending station is still transmitting frames, the receiving station transmits the received frame according to the channel quality statistics, calculated the next transmission frame length, depending on the current traffic class recipient quality requirements and services considering channel quality, the next send transmission frame length, channel coding, modulation and demodulation factor estimated transmission rate of the next transmission frame, and the values ​​into the receiving end of the acknowledgment frame transmission rate notification site.

所述的方法,其中,所述在通信过程中传输速率的调整由与传输速率相关的信息确定的过程包括:定义一速率因子,该速率因子是综合了信道质量信息、当前传输的业务类别相应于当前信道质量信息的误码特性、下一发送帧帧长及与之相应的返回帧帧长、信道编码、调制解调方式因素得到的统计值,用于确定下一发送帧相应的返回帧的发送速率;所述发送站点收到返回帧后,如果仍有发送帧要发送,则将当前接收的返回帧中的接收端确认帧的发送速率值作为该发送帧的传输当前发送帧速率,发送发送帧;根据速率因子计算并填入接收端确认帧的发送速率值然后通知接收站点,所述发送帧中接收端确认帧的发送速率的计算方法如下:接收端确认帧的发送速率估计值=速率因子*传输当前发送帧速率;其中若接收端确认帧的发送速率估计值≥最高传输速 The method of claim, wherein said adjusting a transmission rate included in the communication process the information associated with the determined transmission rate of the process: defining a rate factor, the rate factor is a combination of channel quality information, the service class corresponding to the current transmission the current error characteristics of the channel quality information, transmits the next frame of frame size and frame length return frame corresponding thereto, channel coding, modulation and demodulation factor obtained statistical value is used to determine the next transmission frame corresponding return frame transmission rate; transmitting station after receiving the return frame, the transmission frame to be transmitted if there, the current receiving terminal returns acknowledgment frame received transmission rate as the transmission frame value of the transmission frame rate of a current transmission frame, transmitting the transmission frame; calculated according to the rate factor and fills the receiving end acknowledgment frame transmission rate value is then notify the receiving station, the transmission frame receiving an acknowledgment frame transmission rate calculated as follows: receiving an acknowledgment frame transmission rate estimate transmitting the transmission rate factor = * current frame rate; wherein if a receiving end acknowledgment frame transmission rate estimated value ≥ highest transmission speed 率,接收端确认帧的发送速率=最高传输速率;若接收端确认帧的发送速率估计值≤最低传输速率,接收端确认帧的发送速率=最低传输速率;其他情况,则有接收端确认帧的发送速率=速率因子*传输当前发送帧速率。 Rate, the receiver acknowledgment transmission rate frames = maximum transmission rate; if the receiver acknowledges the transmission rate frames estimated value ≤ lowest transmission rate, the receiver acknowledgment transmission rate frames = lowest transmission rate; other cases, the receiving terminal is an acknowledgment frame transmission rate = transmission rate of the transmission factor * current frame rate.

接收方可以上述算法计算出接收端确认帧的发送速率,并填写在下一个发送帧的估计速率字段通过返回帧通知发送方,发送方将该一个发送帧的估计速率字段值填入当前发送帧的接收端确认帧的发送速率;也可以由发送方在获知速率因子的前提下,依靠上述算法计算出接收端确认帧的发送速率并将该值作为当前发送帧的接收端确认帧的发送速率。 The recipient can calculate the receiving end of the above-described algorithm acknowledgment frame transmission rate, and fill the next transmission frame rate field estimated by the return frame notification sender, the sender transmits a frame rate field values ​​into estimates of the current transmission frame receiving an acknowledgment frame transmission rate; may also be known under the premise rate factor is calculated by the above algorithm relies on the sender a receiver acknowledges a frame transmission rate and the value of the current transmission frame as a reception end acknowledgment frame transmission rate.

所述的方法,其中,所述速率因子通过统计结果得到,速率因子可以是传输过程开始以前收发站点公认的经验值,无须在传输过程中交换该信息;或者是通信过程中由接收站点实时统计的测量值,并将该值直接或隐含在其他参数中通过返回帧通知所述发送站点。 The method of claim, wherein the rate factor obtained through statistics, the rate of transmission factor may begin sending and receiving sites experience previously recognized, the need to exchange information during transmission; or communication by the receiving station during real-time statistics measured value, and this value is directly or implied by other parameters return frame notifying the transmission station.

所述的方法,其中,所述不参与通信的站点不干扰正在进行的通信包括:a)持续时间设置;如果发送的不是最后一个发送帧,发送站点在考虑了帧间间隔的基础上,按以当前发送帧中的接收端确认帧的发送速率发送返回帧、下一发送帧的返回帧以及以传输当前发送帧速率发送下一发送帧所花的时间设置持续时间;如果发送的是最后一个发送帧,发送站点按以接收端确认帧的发送速率发送返回帧所花时间设置持续时间;如果发送的不是最后一个返回帧,接收站点根据接收到的当前发送帧中所含的持续时间、传输当前发送帧速率、接收端确认帧的发送速率、返回帧帧长计算出下一发送帧的帧长;进而可以按当前返回帧中接收端确认帧的发送速率发送下一发送帧和以与下一发送帧相应的返回帧速率发送该下一返回帧所花时间设置持续时间;如果发送的是 The method of claim, wherein the non-participating communication station does not interfere with ongoing communications comprising: a) a set duration; if not the last transmitted frame is transmitted, the transmitting station in consideration on the basis of the interframe gap, by the current receiver sends an acknowledgment frame transmission rate return frame transmission frame, return the next frame to transmit a transmission frame and transmitting the frame rate of a current transmission time for the next transmission frame time duration it takes to set; if the last transmission was a transmission frame, a transmission rate by the sending station to the receiving terminal returns acknowledgment frame transmission frame duration of time spent setting; if not the last transmitted frame returns, the receiving station according to the duration of the current transmission frame contained in the received transmission current transmission frame rate, the receiver acknowledgment transmission rate frames, the frame length is calculated return frame transmission frame length of the next frame; turn may return the current frame by receiving an acknowledgment frame transmission rate is transmitted in the next transmission frame and the lower It returns a transmission frame corresponding to the frame rate of the next transmission time spent setting return frame duration; if the transmission is 后一个返回帧则持续时间设为零;b)网络分配矢量的计算和更新;没有参与通信的站点侦听到正在传输的数据帧,将完整接收数据帧的那一时刻和该数据帧中的持续时间相加,得到网络分配矢量,没有参与通信的站点用新得到的网络分配矢量替换旧有的网络分配矢量。 After a return frame duration is set to zero; calculation b) and updating a network allocation vector; not participating in a communication station listening to the data frame being transmitted, the data frame is completely received and the moment the data frame duration is added to obtain the network allocation vector, did not participate in the site communication network allocation vector to replace the old with the new network allocation vector obtained.

所述的方法,其中,所述数据帧传输包括请求发送帧、允许发送、数据分段及确认帧的发送。 The method of claim, wherein said data frame includes a transmission request to send frame, to allow the transmission, the data segment and the acknowledgment frame transmission.

所述的方法,其中,所述与传输速率相关的信息包括:当前传输的业务类别、信道质量信息、下一发送帧帧长及与之相应的返回帧帧长、信道编码、调制解调方式信息。 The method, wherein the information associated with the transmission rate comprises: traffic class currently transmitted, the channel quality information, transmits the next frame of frame size and frame length return frame corresponding thereto, channel coding, modulation and demodulation information.

所述的方法,其中,所述信道质量根据信噪比、信号强度、误比特率、误符号率、误帧率的统计来确定。 The method of claim, wherein the channel quality signal to noise ratio, signal strength, bit error rate, symbol error rate, frame error rate statistics determined.

本发明所提供的一种无线局域网多速率自适应传输的方法,由于在数据传输过程中,信息传输速率可根据信道状态依物理帧分段自适应地变化;故本发明适用于高速移动无线衰落信道。 Multi-rate wireless local area network of the present invention provides an adaptive transmission method, the data transmission process, information transmission rate can be adaptively vary depending on a physical frame segment according to a channel state; so the invention is applicable to high-speed fading mobile radio channel.

同时采用了速率和业务信息和或与传输速率相关信息的交换技术,帧的发送速率不仅和信道质量信息有关,还和传输业务、传输帧长有关,发送站点不仅确知当前发送帧的信息速率,同时还确知对端返回的确认帧的发送速率。 While using switching technology rate and service information and or information related to the transmission rate, the transmission rate frames only and channel quality information, but also and transmission services, the transmission frame length related to the sending station not only to ascertain the information rate of the current transmission frame and also to ascertain the transmission rate of the acknowledgment frames returned from the server. 因此本发明使得相同业务不同帧长的帧传输成功的概率在统计意义上是平等的,不同业务按其对服务质量的要求可以获得最优的传输速率,使得网络性能获得整体的提高。 Therefore, the present invention allows the same business different frame length of frame transmission probability of success is in the statistical sense of equality, according to their different business requirements for quality of service can obtain the optimal transmission rate, making the overall network performance was improved.

附图说明 BRIEF DESCRIPTION

以下结合附图,通过对本发明具体实施方式的详细说明,将能够使人们更好地了解本发明上述的特点、优点和目的。 In conjunction with the following drawings, detailed description of specific embodiments of the present invention, it will enable a better understanding of the present invention, the above-described features, advantages and objects.

图1示出的是本发明的较佳实施例的无线局域网中传输数据的方法的流程图;图2是本发明的无线局域网中传输数据的方法的详细流程图;图3A和图3B分别示出的是本发明方法的帧结构以及帧头结构的示意图;图4为本发明方法的维护网络分配矢量的方法示意图。 FIG 1 shows a flowchart of a method of transmitting data WLAN preferred embodiment of the present invention; FIG. 2 is a detailed flowchart of a method of transmitting data in a wireless LAN according to the present invention; FIGS. 3A and 3B show It is a schematic diagram illustrating the configuration of a header and a frame structure of the method of the present invention; illustrating a method of maintaining a network allocation vector of the present invention in FIG. 4 of the present method.

具体实施方式 Detailed ways

下面就结合附图对本发明的各个优选实施例进行详细的说明。 Here conjunction with the accompanying drawings of various preferred embodiments of the present invention will be described in detail.

在本发明中将从发送方向接收方发送的帧称为“发送帧”,而从接收方向发送方返回的帧称为“返回帧”,帧结构如图3A和图3B所示的,其中包括前导码、PLCP头信息(PLCP Header),PLCP头信息中包含了与数据传输相关的物理参数。 In the present invention, the frame transmitted from the reception side transmission direction is referred to as "transmission frame", and the frame transmitted from the reception side returns a direction referred to as "return frame", the frame structure as shown in FIG. 3A and 3B, which comprises preamble, PLCP header (PLCP header), PLCP header information includes physical parameters associated with data transmission. 这些参数包括:信令(SIGNAL)、业务(SERVICE)、将要传输的数据的长度(LENGTH)和16位的CRC校验码。 These parameters include: Signaling (SIGNAL), service (SERVICE), the length to be transmitted (the LENGTH) and 16-bit CRC checksum data. 接收机将按照这些参数调整接收速率、选择解码方式、决定何时结束数据接收。 Receiver reception rate adjusted in accordance with these parameters, selecting a decoding mode, determine when the data reception.

本发明的一种无线局域网多速率自适应传输的方法,如图1和图2所示的,该方法包括:收发双方在通信过程中相互交换传输速率和业务类别信息或与传输速率相关的信息;根据上述传输速率和业务类别信息或与传输速率相关的信息,调整当前速率;以及以调整后的当前速率传输数据,在通信过程中传输速率的调整由与传输速率相关的信息确定,不参与通信的站点能够保证不干扰正在进行的通信。 Wireless local area network of the present invention is a multi-rate adaptive transmission method, as shown in FIG. 1 and FIG. 2, the method comprising: the sender and receiver to exchange traffic category information and transmission rate or transmission rate information associated with each other during communication ; based on the transmission rate and service category information, or information related to the transmission rate, adjusting the current rate; and the current rate of the transmission data is adjusted, adjusting the transmission rate determined by the relevant transmission rate information in the communication process, does not participate in the site does not interfere with communication to ensure ongoing communication.

上述传输速率和业务信息或与传输速率相关的信息,包括:传输当前发送帧速率(以下统称RATE)、接收端确认帧的发送速率(以下统称rRATE)、下一个发送帧的估计速率(eRATE)和传输当前业务类别(SC)。 Said transmission rate and service information related to the transmission rate information, comprising: a transmission of the current transmission frame rate (hereinafter referred to as the RATE), receiver acknowledges the transmission rate of the frame (hereinafter referred rRATE), the next transmission estimated rate frames (Erate) traffic class and transmission of the current (SC). 需要说明的是,eRATE隐含了速率因子,与信道质量有关的信息与传输速率和业务信息是一一对应的,传输速率和业务信息交换等同于与传输速率相关的信息交换。 Incidentally, Erate implied rate factor, the channel quality-related information and service information transfer rate is one to one, and the transmission rate of information exchange service is equivalent to the exchange of information related to the transmission rate.

上述调整当前速率包括:将传输速率分为V1~Vp个等级,等级越高速率越快,V1速率最低,定义为基本速率,Vp速率最高,为最高速率。 The adjustment current rate comprising: a transmission rate V1 ~ Vp is divided into levels, the higher level the faster the rate, V1 lowest rate, defined as the base rate, Vp of the maximum rate, the highest rate. 在数据帧传输中,站点根据当前发送帧速率发送数据,在此,初始RATE和rRATE可以被设置为基本速率V1。 In the data frame transmission, the station transmits a data frame based on the current transmission rate, in this case, the initial rRATE RATE and the rate may be set substantially V1. 如果在发送方具有速率信息的统计信息,则也可以根据该统计信息选择高于基本速率的速率作为初始RATE和rRATE,而且RATE和rRATE可以不等。 If the rate information with statistical information on the transmission side, above the base rate may be selected as an initial rate RATE and rRATE basis of the statistical information, and the RATE and rRATE can vary. 但是,前提条件是要充分保证以该初始RATE和rRATE能够正确地传送第一个发送帧和返回帧。 However, the prerequisite is to fully ensure this initial RATE rRATE and capable of transmitting a transmission frame correctly and the first return frame.

所述接收站点在接收到发送帧后,将当前接收的发送帧中的rRATE值作为返回帧的RATE,以该RATE发送返回帧;如果发送站点仍有帧发送,接收站点根据接收的发送帧对信道质量进行统计,计算下一发送帧长,并由当前传递业务类别得到该业务对误帧和时延的服务质量要求,接收方依据当前业务对服务质量的要求综合考虑信道质量、下一发传输帧长、信道编码、调制解调方式因素估计出下一发送帧的发送速率,将该值填入rRATE通知发送站点。 The receiving station after receiving the transmission frame, the current transmission frame rRATE value received as RATE return frame, the transmission frame returns to the RATE; If the sending station still frame transmission, the receiving station receiving a frame transmitted according to the channel quality statistics, calculated the next transmission frame length, the current passed by the service class of the service quality of service obtained frame error and delay requirements, depending on the current recipient service quality requirements and services considering channel quality, the next hair transmission frame length, channel coding, modulation and demodulation factor estimated next transmission frame transmission rate, the transmission values ​​into rRATE notification station.

上述在通信过程中传输速率的调整由与传输速率相关的信息确定,的过程包括:定义一速率因子a,速度因子a是信道质量信息、当前传输的业务类别相应于当前信道质量信息的误码特性、下一发送帧帧长及与之相应的返回帧帧长、信道编码、调制解调方式因素得到的统计值。 The adjusting transmission rate determined by the correlation with the transmission rate information during communication process comprising: defining a rate factor a, the speed factor a is a channel quality information, the current transmission of service class corresponding to the error current channel quality information characteristics, the next transmission frame size and frame return frames larger corresponding thereto, channel coding, modulation and demodulation factor statistics obtained. 接收站点可以由下述算法得出eRATE: The receiving station may be derived by the following algorithm eRATE:

eRATE=a*rRATE;若eRATE≥Vp,rRATE=Vp;若eRATE≤V1,rRATE=V1;其他情况,则有eRATE=a*rRATE;接收站点直接将eRATE通过返回帧通知发送方,发送方将该eRATE值作为当前发送帧的rRATE;本发明的另一个变形是,所述发送站点在收到返回帧后,如果仍有发送帧要发送,则接收站点将速率因子a通过返回帧通知发送站点,发送站点在收到该返回帧后,以其中的rRATE值作为当前发送帧的RATE,以该RATE发送发送帧;并根据当前速率因子a和该RATE计算并填入rRATE值通知接收站点,发送帧中rRATE的计算方法如下:rRATE估计值=a*RATE;若rRATE估计值≥Vp,rRATE=Vp;若rRATE估计值≤V1,rRATE=V1;其他情况,则有rRATE=a*RATE;速度因子a可以通过统计结果得到,速率因子可以是传输过程开始以前收发站点公认的经验值,无须在传输过程中交换该信息;或者是通信过程中由接收站点实时统 eRATE = a * rRATE; if eRATE≥Vp, rRATE = Vp; if eRATE≤V1, rRATE = V1; otherwise, there eRATE = a * rRATE; Erate receiving station directly notifies the sender through the return frame, the sender the eRATE rRATE value as the current transmission frame; another variant of the invention, the sending station after receiving the return frame, the transmission frame to be transmitted if there is a rate factor of the receiving station transmits a notification frame by returning station the sending station after receiving the return frame, wherein as to the value of rATE rRATE the current transmission frame, transmitting the transmission frame to rATE; and according to a current rate factor and the value of rATE is calculated and populated rRATE notify the receiving station, the transmission rRATE frame calculated as follows: rRATE estimation value = a * rATE; if rRATE estimate ≥Vp, rRATE = Vp; if rRATE estimate ≤V1, rRATE = V1; otherwise, there rRATE = a * rATE; velocity a factor obtained by statistics, the rate of transmission factor may begin sending and receiving sites experience previously recognized, the need to exchange information during transmission; or by the receiving station during a communication system in real time 的测量值,并将该值直接或隐含在其他参数(如eRATE)中通过返回帧通知所述发送站点。 It measured value, and this value by returning a frame notifying the transmission station or implied in the other parameters (e.g. Erate) in.

上述不参与通信的站点能够保证不干扰正在进行的通信,其包括:1)持续时间设置;如果发送的不是最后一个发送帧,发送站点在考虑了帧间间隔的基础上,按以rRATE发送返回帧、下一发送帧的返回帧以及以RATE发送下一发送帧所花的时间设置持续时间;如果发送的是最后一个帧,发送站点按以rRATE发送返回帧所花时间设置持续时间。 Is not involved in the above-described communication site to ensure that does not interfere with the ongoing communication, comprising: 1) a set duration; if not the last transmitted frame is transmitted, the transmitting station in consideration of the basis of the interframe gap on the return transmission according to rRATE frame, the next frame of the frame and returns sent to RATE sent the next time it takes to send a frame set duration; if the last frame is transmitted, the transmitting station according to rRATE send return frames it takes time to set duration.

如果发送的不是最后一个返回帧,接收站点可以根据接收到的当前发送帧中所含的持续时间、RATE、rRATE、返回帧帧长计算出下一发送帧的帧长。 If not the last transmission of a return frame, the receiving station may transmit according to the duration of the current frame received contained, RATE, rRATE, return frames larger frame length is calculated the next transmission frame. 接收站点确定了当前发送帧相对应的返回帧后,该返回帧的RATE和rRATE也就确定了,同时接收站点能够获知速率因子a,因此根据该返回帧的rRATE可以计算出与下一发送帧对应的返回帧的发送速率,进而在考虑了帧间间隔的基础上,按以该返回帧的rRATE发送下一发送帧和发送与下一发送帧相应的返回帧所花时间设置持续时间;如果发送的是最后一个确认帧则持续时间设为零。 The receiving station determines the current transmission frame corresponding to the return frame, the frame returns RATE rRATE is also determined and, at the same time the receiving station can know the rate factor a, it can be calculated based on the next frame transmitted frame returns rRATE corresponding return frame transmission rate, and further in consideration on the basis of the interframe gap, according to the return transmission of the next frame rRATE respective return transmission frame and transmits the next transmission frame of the frame set duration of time spent; if send an acknowledgment frame is the last of the duration to zero.

需要说明的是,依照本发明方法,发送站点在发送最后一个发送帧时能够准确地设置持续时间,接收站点在发送最后一个返回帧时能够准确地设置持续时间。 Incidentally, the method according to the present invention, the sending station can be provided at exactly the duration of one transmission frame transmitted last, the receiving station can accurately set the time duration when the final return frame transmission. 这样的设置方法可以保证接收站点对信道的占用,并在通信结束按时释放对信道的占用。 Such an arrangement ensures that the receiving station occupied by the method of the channel, and releases the occupation of the channel at the end of the communication time.

2).网络分配矢量的计算和更新;没有参与通信的站点能够侦听到正在传输的数据帧,将完整接收数据帧的那一时刻和该数据帧中的持续时间相加,并由此得到网络分配矢量。 2) a network allocation vector calculation and updating; not participating site can listen to the communication of the data frame being transmitted, the integrity of data that the duration of the time frame and the data frame are added, and thus obtained a network allocation vector. 没有参与通信的站点用新得到的网络分配矢量替换旧有的网络分配矢量。 The site was not involved in the communication network allocation vector to replace the old with the new network allocation vector obtained.

上述传输速率信息可利用物理帧头或媒质接入控制层帧控制域传输当前发送帧速率和接收端确认帧的发送速率。 It said transmission rate information using a physical header or Medium Access Control layer frame control field of the current transmission rate and the transmission frame rate receiver acknowledges the transmitted frames.

上述数据帧传输可包括请求发送帧、允许发送帧、数据分段及确认帧的发送。 It said data frame transmission may include a request to send frame, to send frame, and the acknowledgment data segment transmission frame.

上述传输速率相关的信息包括:当前传输的业务类别、信道质量信息、下一发送帧帧长及与之相应的返回帧帧长、信道编码、调制解调方式信息。 It said transmission rate related information comprises: service class currently transmitted, the channel quality information, transmits the next frame and the frame length, channel coding, modulation and demodulation method information corresponding thereto returns frames larger.

上述信道质量可根据信噪比、信号强度、误比特率、误符号率或误帧率的统计来确定。 Said channel quality according to the noise ratio, signal strength, bit error rate, symbol error rate or frame error rate statistics determined.

本发明的具体实现方法为: The method of the present invention is embodied as:

1.速率信息交换1).传输速率信息:本发明方法在物理帧头或控制层帧控制域中建立了RATE字段和rRATE字段,分别用来传输当前发送帧速率和接收端返回帧的发送速率的值。 1 1. The exchange rate information) transmission rate information: The method of the present invention establishes a rRATE RATE field and header field in a physical layer frame control field or control, it is used to transmit the transmission frame rate of the frame and the receiving end returns the current transmission rate value.

2).速率变化方式:根据本发明方法,将速率分为V1~Vp个等级,等级越高速率越快,V1速率最低设为基本速率,Vp速率最高,为最高速率。 2) the rate of change mode: The method of the present invention, the speed V1 ~ Vp is divided into levels, the higher level the faster the rate, V1 is set to the lowest rate of the base rate, Vp of the maximum rate, the highest rate. 在数据帧传输时,以碰撞检测的载波侦听多址协议为例,控制帧中的RTS、CTS帧采用初始速率发送,随后的数据分段和与之相应的返回帧根据与传输速率相关的信息在最小速率和最大速率之间自适应地调整;与传输速率相关的信息包括当前传输的业务类别、信道质量信息、数据帧长、信道编码、调制解调方式信息,其中信道质量则可根据信噪比、信号强度、误比特率、误符号率或误帧率的统计来确定。 When a data frame transmission to Carrier Sense Multiple Access Collision Detection protocol, for example, control frames RTS, CTS frame transmitted using the initial rate, and subsequent data segment corresponding thereto back to the frame associated with the transmission rate in accordance with adaptively adjusted between minimum and maximum rates; associated with the transmission rate information comprising service classes currently transmitted, the channel quality information, the data frame length, channel coding, modulation and demodulation method information, according to which the channel quality can be noise ratio, signal strength, bit error rate, symbol error rate or frame error rate statistics determined. 需要说明的是当数据帧不长时,数据帧传输中的数据分段则只有一个。 It should be noted that when the data frame is not long, the data segment of a data frame transmission in only one.

3).根据本发明方法,数据传输过程中,发送站点不仅确知当前发送帧的信息速率,同时还确知了对端返回的确认帧的发送速率。 3) The method of the present invention, data transmission, the sending station to ascertain not only the information rate of the current transmission frame, and also determines the transmission rate of cicadas returned from the acknowledgment frame. 数据传输中的第一个发送帧,其当前发送帧速率域和接收端确认帧的发送速率域以初始速率发送,其后的发送帧传输速率则可以自适应地随着与传输速率相关的信息变化而变化。 Data transmission frame in the first transmission, which transmits a frame rate field and the receiver acknowledgment transmission rate of the current domain frame transmitted at an initial rate, the subsequent transmission frame transmission rate can be adaptively information related to the transmission rate with changes.

4).rRATE的确定:接收站点在接收到发送帧后,如果发送站点仍有数据要发送,接收站点根据接收的发送帧对信道质量进行统计,计算下一发送帧长,并由当前传递业务类别得到该业务对误帧和时延的服务质量要求,接收方依据当前业务对服务质量的要求综合考虑信道质量、下一发传输帧长、信道编码、调制解调方式因素估计出下一发送帧的发送速;将该值作为rRATE通知发送站点。 4) .rRATE determined: the receiving station after receiving the transmission frame, if the sending station still has data to be transmitted, the receiving station transmits the received frame according to the channel quality statistics, calculated the next transmission frame length, the current passed by the service the service category obtained quality of service requirements and delay error frame, the receiving side according to the current service quality requirements and services considering channel quality, the next send transmission frame length, channel coding, modulation and demodulation factor estimated next transmission frame transmission speed; the value as rRATE notification sending station.

所述发送站点收到返回帧后,如果仍有要发送的帧,则将当前接收的返回帧中的rRATE值作为该发送帧的RATE,当前返回帧中若有eRATE,则将eRATE作为rRATE;当前返回帧中若没有eRATE,则根据速率因子a和当前发送帧的RATE计算并填入rRATE值通知接收站点,发送帧中rRATE的计算方法如下:rRATE估计值=a*RATE;若rRATE估计值≥Vp,rRATE=Vp;若RATE估计值≤V1,rRATE=V1;其他情况,则有rRATE=a*RATE。 The sending station receives the return frame, if there is still a frame to be transmitted, the current returns the received frame as rRATE RATE values ​​of the transmission frame, the current frame if Erate returns, as will rRATE Erate; returns the current frame if no Erate, according to the rate factor and a calculation of the current transmission frame rATE and fill rRATE value notification receiving station, the transmit frame rRATE calculated as follows: rRATE estimation value = a * rATE; if rRATE estimate ≥Vp, rRATE = Vp; RATE estimate if ≤V1, rRATE = V1; otherwise, there rRATE = a * RATE.

2.持续时间设置如果发送的不是最后一个帧,发送站点统一用当前发送帧的信息速率传输相应于当前发送帧的接收端确认帧、下一个发送帧和相应的接收端确认帧所花时间设置持续时间;如果发送的是最后一个帧,发送站点根据接收端确认帧的发送速率、接收端确认帧帧长设置持续时间。 2. If the duration of the transmission set is not the last frame, the transmission rate of the transmission station unified information for a current transmission frame, an acknowledgment frame corresponding to the receiving end of the current transmission frame, a transmission frame at the receiving end and the corresponding acknowledgment frame time spent setting duration; if the last frame is transmitted, the transmission rate of transmitting station acknowledgment frame according to the receiving end, the receiving end acknowledgment frames larger set duration. 需要说明的是由于发送站点发送数据帧中的当前发送帧速率和对端确认帧速率总是相等,即发送站点发送数据帧和接收站点返回的该帧的确认帧的传输速率是相等的,这样的设置方法可以保证发送站点对信道的占用,并在通信结束按时释放对信道的占用。 Note that since the transmission station transmits the transmission data of the current frame and the frame rate of an acknowledgment frame rates are always equal, i.e., the sending station transmits the acknowledgment frame transmission rate of the data frame and the frame receiving station returns are equal, so the method of setting the sending station can guarantee the occupancy of the channel, and releases the occupation of the channel at the end of the communication time.

如果发送的不是最后一个确认帧,接收站点可以根据接收到的帧的持续时间、当前发送帧的信息速率、接收端确认帧长计算出下一接收帧的帧长,进而可以按采用接收端确认帧的发送速率发送下一接收帧和相应接收端确认帧所花时间设置持续时间。 If a transmission acknowledgment is not the last frame, the receiving station according to the duration of the received frame, the information rate of the current transmission frame, the receiver acknowledges a frame length to calculate the frame length of the next frame is received, and further confirmed by using a receiving end the transmission rate of transmission of the next frame and a corresponding frame reception side receives an acknowledgment frame to set the duration of time spent. 如果发送的是最后一个确认帧则持续时间设为零。 If an acknowledgment is sent is the last frame of the duration to zero. 需要说明的是由于发送站点发送数据帧中的当前发送帧速率和对端确认帧速率总是相等,即发送站点发送数据帧和接收站点返回的该帧的确认帧的传输速率是相等的,这样的设置方法可以保证接收站点对信道的占用,并在通信结束按时释放对信道的占用。 Note that since the transmission station transmits the transmission data of the current frame and the frame rate of an acknowledgment frame rates are always equal, i.e., the sending station transmits the acknowledgment frame transmission rate of the data frame and the frame receiving station returns are equal, so a method is provided to ensure that the receiving station may occupy the channel and releases the occupation of the channel at the end of the communication time.

3.网络分配矢量的计算和更新没有参与通信的站点能够侦听到正在传输的数据帧,将完整接收数据帧的那一时刻和该数据帧中的持续时间相加,并由此得到网络分配矢量。 3. The network allocation vector is not calculated and updated participating site can listen to the communication of the data frame being transmitted, the integrity of data that the duration of the time frame and the data frame are added, to thereby obtain a network allocation and vector. 没有参与通信的站点用新得到的网络分配矢量替换旧有的网络分配矢量。 The site was not involved in the communication network allocation vector to replace the old with the new network allocation vector obtained.

这样,一方面可以确保移动终端成对通信时不会相互干扰,消除有时持续时间大于实际传输时长的负面影响,另一方面可以提高全网的工作效率。 In this way, one can ensure that will not interfere with each other when the mobile communication terminal pairs, eliminating the sometimes long duration greater than the actual transmission of a negative impact, on the other hand can improve the efficiency of the whole network.

如图1所示,本实施例的无线局域网中传输数据的方法,首先在步骤101,以当前速率,从发送方向接收方发送一个发送帧,帧中包含接收端确认帧的发送速率和业务类别。 , Wireless local area network according to the present embodiment, the data transmission method shown in FIG. 1, first, in step 101, the current rate, the receiver sends a transmission frame from the transmission direction, comprising receiving an acknowledgment frame transmission rate and traffic class of the frame . 正如本领域技术人员已知的那样,在无线局域网(WLAN)中发送帧可以包括:RTS(Request To Send,请求发送)帧、数据帧等;分别与发送帧相对应地,返回帧可以包括:CTS(Clear To Send,允许发送)帧、ACK(确认)帧等。 As those skilled in the art is known, in the wireless LAN (WLAN) transmission frame may include: RTS (Request To Send, Request to Send) frame, a data frame and the like; respectively corresponding to the transmission frame, return frame may include: CTS (Clear To send, allowed to send) frames, ACK (acknowledgment) frame and the like.

接着,在步骤105,以当前接收的发送帧中的接收端确认帧的发送速率,从接收方向发送返回速率和下一个发送帧返回帧的发送速率或与传输速率相关的信息以及速率因子a。 Next, at step 105, to the receiving end sends a frame currently received acknowledgment transmission rate frames, transmitting the return rate, and the next transmission frame return frame transmission rate or associated with the transmission rate information and rate factor a from the receiving direction. 具体地,可以是,接收方接收由发送方发来的发送帧,根据接收的结果评价信道质量,结合发送帧对所传业务类别的描述、下一发送帧长和返回帧帧长等因素,确定该业务类别数据下一个发送帧最佳的传输速率和速率因子a,用该最佳传输速率和速率因子a求得相应于下一个发送帧的返回帧的传输速率作为下一个发送帧返回帧的发送速率,并将将该最佳传输速率和下一个发送帧返回帧的发送速率返回给发送方;或者接收方将该最佳传输速率的信息和速率因子a返回给发送方;或者,也可以是,接收方只是将与速率相关的信息返回给发送方,然后由发送方根据信道质量确定最佳传输速率。 In particular, it is possible that the recipient receives the sender sent by the transmission frame, according to the evaluation result of the received channel quality, in conjunction with the description of the transmission frame transmitted service class, the next transmission frame length and frame length and other factors return frame, the service class determines the optimal transmit a data transmission rate and frame rate factor a, by a factor, and the preferred transmission rate at a rate calculated corresponding to the transmission rate of the return frame transmission frame as the next transmission frame return frame transmission rate, and a preferred transmission rate and the transmission frame at a transmission rate of the return frame is returned to the sender; recipient or the information transmission rate and the best rate factor of a return to the sender; Alternatively, It may be, but the receiver associated with the rate information back to the sender, and then determine the optimal transmission rate by the sender in accordance with the channel quality.

在此,对于如何评价信道质量、如何根据信道质量确定最佳传输速率,本发明方法并没有特别的限制,可以采用本领域技术人员了解的任何方法。 Here, how to evaluate the channel quality, how to determine the best channel quality transmission rate, the method of the present invention is not particularly limited, and any method in the art to understand the art may be employed. 后面描述的本发明最佳实施例中示例性地列举了一些方法,但是本发明方法并不限于这些具体实施例。 Preferred embodiment of the present invention described later exemplarily cited a number of methods, but the method of the present invention is not limited to these particular embodiments.

接着,在步骤110,根据返回的与传输速率或与传输速率相关的信息,调整当前速率。 Next, at step 110, according to the return associated with the transmission rate or transmission rate information, the current rate adjustment. 具体地,与前面返回信息的步骤相对应,如果从接收方返回的是与传输速率相关的信息,则在发送方进一步根据该质量信息确定一个最佳传输速率来调整当前速率;如果从接收方返回的是指示最佳传输速率的信息,则在发送方直接按照该信息更新当前速率即可。 In particular, the step of returning information corresponding to the foregoing, if the receiver is returned from the related information transmission rate, it is further preferred to determine a transmission rate on the transmission side based on the quality information to adjust the current rate; if the recipient returns information indicating the optimum transmission rate, then the information can be directly updated according to the current rate at the sender.

然后,在步骤115,以调整后的当前速率,从发送方向接收方发送下一个发送帧。 Then, at step 115, the current rate after adjustment, the receiver sends a transmission frame from the transmission direction.

这样,本实施例的无线局域网中传输数据的方法可以根据传输业务、信道质量、传输帧长以不同的速率传输数据,从而适应传输业务的要求以及由于移动或其他原因造成的信道质量的变化。 Thus, the method of a wireless LAN according to the present embodiment, the transmission data may be at a different rate transmission data according to transmission service, the channel quality, the transmission frame length, to accommodate the transmission service requirements and variations in channel quality due to movement or other causes.

如图2所示是本发明方法的一优选实施例的流程图示,在开始一次数据传输后,首先在步骤205,设置初始RATE、rRATE。 FIG 2 is a flowchart illustration of a preferred embodiment of the method of the present invention, after the start of a data transfer, first, in step 205, an initial RATE, rRATE. 在本实施例中,传输速率被划分为多个级V1~VP,其中V1是基本速率(最低速率),VP是最高速率。 In the present embodiment, the transmission rate is divided into a plurality of stages V1 ~ VP, where V1 is the base rate (lowest rate), VP is the highest rate.

在此,初始RATE、rRATE可以被设置为基本速率V1。 Here, the initial RATE, rRATE basic rate may be set to V1. 如果在发送方具有信道质量的统计信息,则可以根据该统计信息选择一个高于基本速率的速率作为初始当前速率。 If the statistical channel quality information in the sender can select a rate substantially higher than the initial rate as the current rate based on the statistical information. 但是,前提条件是要充分保证以该初始当前速率能够正确地传送第一个发送帧和返回帧。 However, the prerequisite is to fully guarantee that the initial current rate can be transmitted correctly and the first return frame transmission frame.

接着,在步骤210,以该初始RATE,从发送方向接收方发送RTS帧。 Next, at step 210, to the initial RATE, the receiver transmits an RTS frame from the transmission direction. 正如本领域技术人员已知的那样,通常在WLAN中开始一次数据传输,首先要由发送方发送RTS帧作为请求。 As those skilled in the art as typically begin a data transfer in the WLAN, first RTS frame transmitted by the sender as the request.

接着,在步骤215,接收方收到该RTS请求后,以该RTS中初始rRATE作为RATE返回一个CTS帧。 Next, at step 215, the receiver receives the RTS request to the initial rRATE RATE as RTS returns a CTS frame. 具体地,接收方接收由发送方发来的RTS帧,根据接收的结果评价信道质量,然后结合RTS帧中包含的业务类别和其持续时间中隐含的数据帧长等信息确定一个最佳的传输速率例如V4和速率因子a,并且在向发送方返回的CTS返回帧中包含表示该最佳传输速率的信息和下一个发送帧返回帧的发送速率或该最佳传输速率的信息和速率因子a。 Specifically, the recipient receives by the sender sent the RTS frame, according to the evaluation result of the received channel quality, and then combined with traffic class contained in the RTS frame and its duration implied data frame length information to determine an optimal rate and transmission rate, for example, V4 factor a, and contained in the return frame is returned to the sender information and the CTS represents the optimum transmission rate of a transmission frame return frame transmission rate or the transmission rate information and the best rate factor a.

接着,在步骤220,根据CTS帧中的最佳传输速率信息和下一个发送帧返回帧的发送速率或该最佳传输速率的信息和速率因子a,发送方调整RATE、rRATE例如V4、V5。 Next, at step 220, according to the best transmission rate information and the CTS frame transmitted in a return frame transmission rate information or frame rate and the best transmission rate factor a, the transmission side to adjust the RATE, rRATE e.g. V4, V5.

接着,在步骤225,以调整后的RATE,从发送方向接收方发送一个数据帧。 Next, at step 225, to the adjusted RATE, the transmission direction is received from a transmission side data frame.

接着,在步骤230,同样以该调整后的RATE,从接收方向发送方返回一个Ack帧。 Next, at step 230, similarly to the adjusted RATE returns an Ack frame from the reception side transmission direction. 与前述的步骤215一样,接收方接收由发送方发来的数据帧,根据接收的结果评价信道质量,然后确定结合当前传输业务类别和数据帧中持续时间中隐含的下一数据帧长等信息确定一个最佳的传输速率一个最佳的传输速率和速率因子a,并且在向发送方返回的Ack返回帧中包含表示该最佳传输速率的信息和下一个发送帧返回帧的发送速率或该最佳传输速率的信息和速率因子a。 As with the previous step 215, the sender by the recipient receives a data frame sent, channel quality evaluation results of the reception channel, and then determining the service class with the current transmission data frame duration and implied next data frame length, etc. information for determining an optimum transmission rate of an optimal transmission rate and rate factor a, and returns the Ack frame to return to the sender information includes information indicating this optimum transmission rate of a transmission frame return frame transmission rate or and the best rate of the information transfer rate factor a.

接着,在步骤235,判断是否还有数据帧需要发送。 Next, at step 235, it is determined whether there are data frames to be transmitted. 如果判断为“是”,则进行到步骤240,根据该ACK中的rRATE、eRATE或rRATE和速率因子a,发送方调整RATE、rRATE,与前述的步骤220相同;然后,返回到步骤225重复执行步骤225~240,直到没有数据帧需要发送为止。 If the determination is "YES", it proceeds to step 240, based on the ACK is rRATE, eRATE or rRATE and rate factor a, the transmission side to adjust the RATE, rRATE, the aforementioned step 220 the same; and then returns to step 225 is repeatedly executed steps 225 to 240 until no more data frames to be transmitted.

如果步骤235的判断为“否”,则在步骤245结束。 If the determination in step 235 is "No", then at step 245 ends.

下面结合图4对于本发明实施例中发送帧和返回帧的持续时间的设置方式以及没有参与数据传输的其它站点维护网络分配矢量(NAV)的方式进行说明。 Below in connection with FIG. 4 for maintaining a network allocation vector (NAV) is provided in the embodiment according to the duration of the transmission frame and return frame and other sites not involved in the data transmission of the embodiment of the present invention will be described.

正如本领域技术人员已知的那样,在以往无线局域网的数据通信中,为了减小碰撞的损失以及隐藏终端等的影响,在RTS和CTS帧里存放预留时长信息,RTS为20字节,CTS为14字节。 As those skilled in the art is known, in the conventional data communication in a wireless local area network, in order to reduce the loss of impact collisions and hidden terminal or the like, the RTS and CTS frames in the reservation information storing long, 20 bytes RTS, CTS is 14 bytes. 没有参与数据传输的其它站点,接收到RTS/CTS帧,获取持续时间信息后更新自己的NAV(network allocation vector)值,为竞争信道的发送方和接收方进行数据交换预留出信道带宽,如图4所示。 Update their NAV (network allocation vector) value other sites not involved in the data transmission, receiving the RTS / CTS frame, Duration information, data exchange to reserve the channel bandwidth contention channel sender and receiver, such as 4 shown in FIG.

在以往传输速率一定的情况下,以上这种方式是可行的。 In the conventional transmission rate is constant, this approach is more feasible. 但是,如果采用本发明的方法,则由于传输速率是变化的,仅仅依靠RTS和CTS帧的持续时间信息是不够的,会造成其它节点的NAV值的更新不准确,导致资源浪费或冲突增加。 However, if the method of the invention, since the transmission rate is changed, relying solely on duration information RTS and CTS frame is not enough, it will cause the updated NAV values ​​of other nodes inaccurate, resulting in increased waste of resources or conflicts.

因此,本发明方法在从发送方向接收方发送每一个发送帧时,例如,图1的步骤105、115以及图2的步骤210、225中,都为该发送帧设置持续时间。 Thus, the method of the present invention, when the receiver transmits a transmission frame from each transmission direction, e.g., FIG. 1, Step 105, 115 and 210, 225 in FIG. 2, are set for the duration of the transmission frame. 具体地,首先根据以当前速率传输与该发送帧对应的返回帧、下一个发送帧和与下一发送帧对应的返回帧所花的时间,计算该发送帧的持续时间。 Specifically, first the current rate transmission according to the transmission frame corresponding to the return frame, and transmitting the next transmission frame and the next frame corresponding to a time frame to return spent calculating the duration of the transmission frame. 然后,将计算出的该发送帧的持续时间设置在该发送帧的持续时间字段中。 Then, the duration of the transmission frame is provided in the calculated duration field of the transmission frame.

例如,在图2的步骤210中计算该RTS帧的持续时间时,就应当计算以初始rRATE传输与该RTS对应的CTS返回帧、以初始RATE传输下一个数据发送帧(步骤225中要发送的数据帧)和以初始rRATE传输与该下一个发送帧对应的返回帧所花的时间,当然还应包括这些帧之间的间隔时间(SIFS)再例如,在图2的步骤225中计算该数据发送帧的持续时间时,就应当计算以调整后的rRATE传输与该数据发送帧对应的Ack返回帧、以调整后的RATE传输下一个数据发送帧(如果有的话,下一次循环执行步骤225处理的数据帧)和以调整后的rRATE传输与该下一个发送帧对应的Ack返回帧所花的时间,当然还应包括这些帧之间的间隔时间(SIFS)。 For example, when the duration of the RTS frame is calculated in step 210 of Figure 2, it should be calculated in an initial rRATE transmission corresponding to the RTS the CTS return frame, transmitted in the initial RATE transmit a data frame (step 225 to be transmitted data frame) and an initial transmission rRATE a transmission frame and the lower frame return time spent corresponding, of course, should also include the time interval (SIFS), for example, between the frames and then, the calculated data in step 225 in FIG. 2 when the duration of the frame transmission, the transmission should be calculated rRATE the data to adjust the transmission frame corresponding to the Ack frame is returned, after the transmission RATE to adjust a transmission frame data (if any, the next step 225 loop processing the data frame) and to the lower rRATE transmission and a transmission frame corresponding to the Ack frame is returned after the adjustment takes time, of course, it should also include the time interval (SIFS) between the frames.

进而,根据本发明方法,在从接收方向发送方返回每一个返回帧时(例如,图2的步骤215、230中)都为该返回帧设置持续时间。 Furthermore, the method according to the present invention, each return a return frame (e.g., step 215, 230 in FIG. 2) in the direction of transmission from the receiving side are provided for the return frame duration. 具体地,首先,根据接收到的与该返回帧对应的发送帧的持续时间、RATE、rRATE和该返回帧的帧长计算出下一个发送帧的帧长。 Specifically, first, based on the received frame corresponding to the returned transmission frame duration, RATE, rRATE return frame and the frame length of the frame length is calculated the next transmission frame. 然后,计算该返回帧的持续时间,该返回帧的持续时间相应于按照与传输速率或信道质量有关的信息所指示的传输速率发送下一接收帧,和以该速率和速率因子推导的返回帧速率发送与该下一发送帧对应的返回帧所花时间。 Then, calculate the return duration of the frame, the return frame duration corresponding to the transmission of the next received frame according to the transmission rate and transmission rate or information relating to the channel quality indication, and at this rate and the rate factor derived return frame transmitting the return rate of the next transmission frame is a frame corresponding to time spent. 最后,将计算出的该返回帧的持续时间设置在该返回帧的持续时间字段中。 Finally, the calculated duration of the return frame is disposed in the return frame duration field.

例如,在图2的步骤215中计算该CTS帧的持续时间时,首先,根据步骤210发送的RTS帧中的持续时间(D1)、初始RATE(V1)、rRATE(V2)和该CTS帧的帧长(L1)计算出下一个发送帧(步骤225要发送的帧)的帧长(L2),可以通过以下公式计算:L2=(D1-3*SIFS)*V1-2*L1*V1/V2。 For example, when the duration of the CTS frame is calculated in the step of FIG. 2 215, first, according to the RTS frame the step of transmitting 210 of duration (Dl), the initial RATE (V1), rRATE (V2) and the CTS frame frame length (L2) frame length (L1) is calculated next transmission frame (a frame to be transmitted in step 225) can be calculated by the following formula: L2 = (D1-3 * SIFS) * V1-2 * L1 * V1 / V2. 当没有后续数据帧时(可以通过More Frag字段状态获知),L2=0。 When there is no subsequent data frames (More Frag field may be learned by state), L2 = 0.

同时,根据本优选实施例,网络中那些没有参与通信的其它站点监听信道中每一个发送帧和返回帧,根据其中记录的持续时间更新NAV值。 Meanwhile, a preferred embodiment according to the present embodiment, the network monitor those other sites not involved in the communication channels of a transmission frame and each return frame, update the NAV value according to the duration of the recorded therein. 这样,即使在传输速率变化的情况下,也可以保证无线局域网中各个节点NAV值的准确更新,在可以进一步节省资源的同时还可以避免冲突的发生。 Thus, even in a case where the transmission rate changes, may be updated to ensure accurate NAV value of each node in the wireless LAN, can further save resources, while also avoid conflict.

本发明方法在数据传输过程中,信息传输速率可根据信道状态依物理帧分段自适应地变化;故本发明适用于高速移动无线衰落信道。 The method of the present invention, during data transmission, the information transmission rate may vary depending on a physical frame adaptively according to channel state segment; so the invention is applicable to high-speed fading mobile radio channels.

同时,本发明方法还采用了速率信息的交换技术,帧的发送速率不仅和信道质量信息有关,还和帧长有关,发送站点不仅确知当前发送帧的信息速率,同时还确知对端返回的确认帧的发送速率。 Meanwhile, the method of the present invention also uses a switching technology rate information, the transmission rate frames only and channel quality information, but also and frame length related to the sending station not only to ascertain the information rate of the current transmission frame, and also to ascertain the peer returns acknowledgment frame transmission rate. 因此本发明不仅兼容现有的固定速率传输协议,同时不同帧长的帧传输成功的概率在统计意义上是平等的,使得网络性能获得整体的提高。 Thus, the present invention is not compatible with conventional fixed rate transmission protocol, while the probability of successful transmission of a frame of a different frame length are equal in the statistical sense, so that the overall network performance improvement is obtained.

本发明方法通过及时更新网络分配矢量的方法实现全连通网络的多速率传输。 The method of the present invention, by a method to update a network allocation vector to achieve the full multi-rate communication networks.

应当理解的是,本发明方法的上述针对较佳实施例的描述过于具体,并不能因此而限制本发明请求专利保护的范围,专利保护范围应以所附权利要求为准。 It should be understood that the above description for the preferred embodiment of the method of the present invention too specific, and thus does not limit the claimed invention patentable scope of the patent scope of the appended claims should prevail.

Claims (12)

1.一种无线局域网多速率自适应传输的方法,其特征在于,该方法包括:收发双方在通信过程中相互交换传输速率信息或与传输速率相关的信息;根据上述传输速率信息或与传输速率相关的信息,分别调整当前传输速率;以及以调整后的当前速率传输数据。 A wireless LAN multi-rate adaptive transmission method, wherein the method comprising: the sender and receiver to exchange information related to the transmission rate information transmission rate during communication with each other; based on the information transmission rate or transmission rate related information, respectively, to adjust the current transmission rate; and the current transmission rate adjusted data.
2.根据权利要求1所述的方法,其特征在于,所述与传输速率信息包括:传输当前发送帧速率、接收端确认帧的发送速率和下一个发送帧的估计速率,或传输当前发送帧速率和接收端确认帧的发送速率。 The method according to claim 1, characterized in that, with the transmission rate information comprising: a transmission rate of a current transmission frame, the receiver acknowledgment transmission rate frame rate estimate and the next transmission frame, or transmission of the current transmission frame rate and transmission rate receiver acknowledges frames.
3.根据权利要求1所述的方法,其特征在于,所述调整当前传输速率的过程包括:将传输速率分为多个等级,等级越高速率越快,定义最低速率为基本速率;数据帧传输中,站点根据当前发送帧速率发送数据,初始传输当前发送帧速率和接收端确认帧的发送速率并被设置为基本速率。 3. The method according to the process according to claim 1, wherein said adjusting the current transmission rate comprising: a plurality of levels into the transmission rate, the faster the higher the level, the lowest rate is defined as the basic rate; data frame transmission, the transmission station transmits data according to the current frame rate, the initial transmission rate and the current transmission frame transmission rate receiver acknowledges a frame and set to a basic rate.
4.根据权利要求3所述的方法,其特征在于,在所述调整当前传输速率的过程中,如果在发送方具有传输速率或与传输速率相关的信息的统计信息,则根据该统计信息选择高于基本速率的速率作为初始传输当前发送帧速率和接收端确认帧的发送速率和当前传输业务类别,传输当前发送帧速率和接收端确认帧的发送速率可以不相等,以能够正确地传送第一个发送帧和返回帧为适合。 4. The method according to claim 3, wherein, in the adjustment process of the current transmission rate, the statistical information if the sender has a transmission rate or a transmission rate associated with, the information selected according to the statistics substantially higher than the rate of transmission of the current transmission rate as the original frame rate and the transmission rate receiver acknowledges the current transmission frame and a service class, and the transmission of the current transmission frame rate receiver acknowledges the transmission rate frames may not be equal to the first transmission can be correctly and a return frame transmission frame suitable.
5.根据权利要求4所述的方法,其特征在于,在数据帧传输中,接收站点在接收到发送帧后,将当前接收的发送帧中的接收端确认帧的发送速率值作为返回帧的传输当前发送帧速率,以该传输当前发送帧速率发送返回帧。 5. The method as claimed in claim 4, wherein, in a data transmission frame, the receiving station after receiving the transmission frame, the receiving end sends a frame currently received acknowledgment frame transmission rate as the return value of the frame transmission of the current frame transmission rate, to transmit the return frame transmission of the current transmission frame rate.
6.根据权利要求5所述的方法,其特征在于,所述数据帧传输中,如果发送站点仍有帧发送,所述接收站点根据接收的发送帧对信道质量进行统计,计算下一发送帧长,接收方依据当前业务类别对服务质量的要求综合考虑信道质量、下一发传输帧长、信道编码、调制解调方式因素估计出下一发送帧的发送速率,并将该值填入接收端确认帧的发送速率通知发送站点。 6. The method according to claim 5, wherein said data frame transmission, if the sending station is still transmitting frames, the receiving station the channel quality statistics according to the received transmission frame, calculating a next transmission frame long, depending on the current traffic class recipient quality requirements and services considering channel quality, the next send transmission frame length, channel coding, modulation and demodulation factor estimated transmission rate of the next transmission frame, and the received values ​​into an acknowledgment frame transmission rate notification sending station.
7.根据权利要求1至6任一权项所述的方法,其特征在于,所述在通信过程中传输速率的调整由与传输速率相关的信息确定的过程包括:定义一速率因子,该速率因子是综合了信道质量信息、当前传输的业务类别相应于当前信道质量信息的误码特性、下一发送帧帧长及与之相应的返回帧帧长、信道编码、调制解调方式因素得到的统计值,用于确定下一发送帧相应的返回帧的发送速率;所述发送站点收到返回帧后,如果仍有发送帧要发送,则将当前接收的返回帧中的接收端确认帧的发送速率值作为该发送帧的传输当前发送帧速率,发送发送帧;根据速率因子计算并填入接收端确认帧的发送速率值然后通知接收站点,所述发送帧中接收端确认帧的发送速率的计算方法如下:接收端确认帧的发送速率估计值=速率因子*传输当前发送帧速率;其中若接收端确 Item 7. The method according to any one of a weight according to claim 1 to 6, wherein said adjusting a transmission rate comprises information related to the process of determining a transmission rate during communication: a defined rate factor, the rate of factor is a combination of channel quality information, the current transmission of service class corresponding to the current error characteristics of the channel quality information, transmits the next frame and the frame length, channel coding, modulation and demodulation factors corresponding thereto to give back to the frame of the frame length statistics for determining the next transmission frame corresponding return frame transmission rate; transmitting station upon receipt of the return frame, the transmission frame to be transmitted if there, then the current frame is returned by the receiver received the acknowledgment frame transmission of the transmission rate value as the transmission frame rate of a current transmission frame, transmitting the transmission frame; calculating and fills receiver acknowledges a frame rate factor in accordance with a transmission rate value and then notifies the receiving station, the transmission frame receiving an acknowledgment frame transmission rate is calculated as follows: receiving an acknowledgment frame transmission rate estimated value * = rate factor of the transmission rate of the current transmission frame; wherein determining if a receiving end 帧的发送速率估计值≥最高传输速率,接收端确认帧的发送速率=最高传输速率;若接收端确认帧的发送速率估计值≤最低传输速率,接收端确认帧的发送速率=最低传输速率;其他情况,则有接收端确认帧的发送速率=速率因子*传输当前发送帧速率。 Transmission rate frames estimated value ≥ maximum transmission rate, the receiver acknowledgment transmission rate frames = maximum transmission rate; if the receiver acknowledges a frame transmission rate estimated value ≤ lowest transmission rate, the receiver acknowledgment transmission rate frames = minimum transfer rate; other cases, the receiving terminal is transmitted acknowledgment frame rate = transmission rate of the transmission factor * current frame rate. 接收方可以上述算法计算出接收端确认帧的发送速率,并填写在下一个发送帧的估计速率字段通过返回帧通知发送方,发送方将该一个发送帧的估计速率字段值填入当前发送帧的接收端确认帧的发送速率;也可以由发送方在获知速率因子的前提下,依靠上述算法计算出接收端确认帧的发送速率并将该值作为当前发送帧的接收端确认帧的发送速率。 The recipient can calculate the receiving end of the above-described algorithm acknowledgment frame transmission rate, and fill the next transmission frame rate field estimated by the return frame notification sender, the sender transmits a frame rate field values ​​into estimates of the current transmission frame receiving an acknowledgment frame transmission rate; may also be known under the premise rate factor is calculated by the above algorithm relies on the sender a receiver acknowledges a frame transmission rate and the value of the current transmission frame as a reception end acknowledgment frame transmission rate.
8.根据权利要求7所述的方法,其特征在于,所述速率因子通过统计结果得到,速率因子可以是传输过程开始以前收发站点公认的经验值,无须在传输过程中交换该信息;或者是通信过程中由接收站点实时统计的测量值,并将该值直接或隐含在其他参数中通过返回帧通知所述发送站点。 8. The method according to claim 7, characterized in that the rate factor is obtained by statistics, the rate factor may be started before the transmission of the transceiver site recognized experience, without the exchange of information during transmission; or communication from the value measured during the real-time statistics of the receiving station, and the value of other parameters directly or implicitly by informing the sending station return frame.
9.根据权利要求1所述的方法,其特征在于,所述不参与通信的站点不干扰正在进行的通信包括:a)持续时间设置;如果发送的不是最后一个发送帧,发送站点在考虑了帧间间隔的基础上,按以当前发送帧中的接收端确认帧的发送速率发送返回帧、下一发送帧的返回帧以及以传输当前发送帧速率发送下一发送帧所花的时间设置持续时间;如果发送的是最后一个发送帧,发送站点按以接收端确认帧的发送速率发送返回帧所花时间设置持续时间;如果发送的不是最后一个返回帧,接收站点根据接收到的当前发送帧中所含的持续时间、传输当前发送帧速率、接收端确认帧的发送速率、返回帧帧长计算出下一发送帧的帧长;进而可以按当前返回帧中接收端确认帧的发送速率发送下一发送帧和以与下一发送帧相应的返回帧速率发送该下一返回帧所花时间设置持 9. The method according to claim 1, wherein the non-participating communication station does not interfere with ongoing communications comprising: a) a set duration; if not the last transmitted frame is transmitted, in consideration of the sending station on the basis of the interframe gap, by the acknowledgment frame transmission rate to the receiving end a current transmission frame return frame transmission, the next transmission frame and return frame transmission at a transmission rate of the current frame the next transmission frame transmission time spent continuously provided time; if the transmission is the last transmission frame, transmitting station according to the receiving end acknowledgment transmission rate frame transmitted return frame time spent set duration; if the transmission is not the last return frame, the receiving station transmits a frame according to the currently received duration contained in the transmission frame rate of a current transmission, the receiver acknowledgment transmission rate frames, the frame length is calculated return frame transmission frame length of the next frame; turn may return the current frame by receiving an acknowledgment frame transmitted transmission rate to transmit the next transmission frame and the next frame corresponding to the frame rate to transmit the next return return frame holding time spent setting 时间;如果发送的是最后一个返回帧则持续时间设为零;b)网络分配矢量的计算和更新;没有参与通信的站点侦听到正在传输的数据帧,将完整接收数据帧的那一时刻和该数据帧中的持续时间相加,得到网络分配矢量,没有参与通信的站点用新得到的网络分配矢量替换旧有的网络分配矢量。 Time; if the last transmitted frame returns the duration is set to zero; calculation b) and updating a network allocation vector; not participating in a communication station listening to the data frame being transmitted, the integrity of data frames that time and the duration of the data frame is added to obtain a network allocation vector, not involved in replacing the old site communication network allocation vector with the new network allocation vector obtained.
10.根据权利要求9所述的方法,其特征在于,所述数据帧传输包括请求发送帧、允许发送、数据分段及确认帧的发送。 10. The method according to claim 9, wherein said data frame includes a transmission request to send frame, to allow the transmission, the data segment and the acknowledgment frame transmission.
11.根据权利要求10所述的方法,其特征在于,所述与传输速率相关的信息包括:当前传输的业务类别、信道质量信息、下一发送帧帧长及与之相应的返回帧帧长、信道编码、调制解调方式信息。 11. The method according to claim 10, wherein the information associated with the transmission rate comprising: a service class currently transmitted, the channel quality information, transmits the next frame of frame size and the frame length corresponding thereto back to the frame , channel coding, modulation and demodulation method information.
12.根据权利要求11所述的方法,其特征在于,所述信道质量根据信噪比、信号强度、误比特率、误符号率、误帧率的统计来确定。 12. The method according to claim 11, wherein the channel quality signal to noise ratio, signal strength, bit error rate, symbol error rate, frame error rate statistics determined.
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