CN103298064B

CN103298064B - Downlink data transmission method and relevant device and communication system

Info

Publication number: CN103298064B
Application number: CN201210053747.4A
Authority: CN
Inventors: 方平; 丁志明
Original assignee: Huawei Device Co Ltd
Current assignee: Huawei Device Co Ltd
Priority date: 2012-03-02
Filing date: 2012-03-02
Publication date: 2017-06-27
Anticipated expiration: 2032-03-02
Also published as: CN103298064A; WO2013127304A1

Abstract

The embodiment of the invention discloses a kind of downlink data transmission method and relevant device and communication system.One of which downlink data transmission method, including：Terminal device receives broadcast frame；Wherein, broadcast frame carries at least one service time information, and service time information is used to indicate that access device issues the service time of downlink data；If terminal device determines to have the downlink data do not downloaded, in the service time indicated by wherein one or more service time information at least one service time information, downlink data is obtained from the access device.The technical scheme of the embodiment of the present invention advantageously reduces the data transfer competition between terminal device, and then is conducive to preferably being applied to the communication scenes that there is more multi-terminal equipment.

Description

Downlink data transmission method and relevant device and communication system

Technical field

The present invention relates to communication technical field, and in particular to downlink data transmission method and relevant device and communication system.

Background technology

Wireless Fidelity (WiFi, Wireless Fidelity) technology is a kind of short-distance wireless communication technology, is made based on it With it is convenient, transmission rate is high the advantages of, WLAN build and wide area network access in terms of be obtained for and be widely applied.Example As set up home wireless local area network by WiFi technology in the family, in office's Wireless Office Network Based.

If the access point (AP, Access Point) of WiFi is arranged on into such as public field of Airport lounges, coffee-house Close, then terminal device (such as STA, Station (terminal device as supported 802.11 agreements)) in the public arena By the AP access networks.

In WiFi wireless networks, when certain terminal device adds network, the terminal device is first associated with AP, and AP is The terminal device distributes 1 association identification (AID, Association ID).Afterwards, terminal device receives what AP periodically sent Broadcast beacon frame (Beacon frames).Comprising transmission indicating bit table (TIM, Traffic Indication Map) in the Beacon frames Message, indicates whether each mobile device has downlink data to be transmitted using TIM in beacon frame.Wherein, partial virtual in TIM Each bit of bitmap corresponds to a mobile device that may be present, and bit (i.e. indicating bit) part in original TIM respectively The transmission indicating bit sequence number (i.e. AID) of corresponding some mobile device of position number in virtual bitmap.

IEEE (Institute of Electrical and Electronics Engineers, U.S. electric and electronics IEEE) 802.11 existing specifications define an AP and can at most support to connect under 2007 terminal devices, but actually 1 AP The terminal device quantity for connecing is typically also up to hundreds of with regard to tens by the limitation such as AP bandwidth.The IEEE for formulating 1 AP of 802.11ah standards requirement supported to 6000 terminal devices, due to IEEE 802.11ah mainly for application scenarios Under (such as intelligent meter data recording scene) terminal device the usual very little of data volume, therefore from the point of view of bandwidth resources, 1 AP can be supported To thousands of end equipment, and sometimes really can 6000 terminal devices simultaneously in net.

Practice finds, when the terminal device quantity accessed under AP is more, often goes out between each terminal device for accessing Now competition is transmitted the situation of data with AP, and competition intensity may increase and increase with the quantity of access terminal equipment, this Sample may large effect data transmission efficiency.

The content of the invention

The embodiment of the present invention provides downlink data transmission method and relevant device and communication system, to reduce terminal device Between data transfer competition, and then be conducive to preferably be applied to exist more multi-terminal equipment communication scenes.

In order to solve the above technical problems, the embodiment of the present invention provides following technical scheme：

The embodiment of the present invention provides a kind of downlink data transmission method, including：

Terminal device receives broadcast frame；

Wherein, the broadcast frame carries at least one service time information, and the service time information connects for indicating Enter device-specific in the service time for issuing downlink data；

If the terminal device determines to have the downlink data do not downloaded, at least one service time information In service time indicated by wherein one or more service time information, downlink data is obtained from the access device.

The embodiment of the present invention also provides another downlink data transmission method, including：

Access device issues broadcast frame；

Wherein, the broadcast frame carries at least one service time information, and the service time information is used to indicate institute State the service time that access device is exclusively used in issuing downlink data；

If terminal device has a downlink data do not downloaded, access device notifies that the terminal device has do not download descending Data, the service time indicated by wherein one or more service time information at least one service time information It is interior, issue downlink data to the terminal device.

The embodiment of the present invention also provides a kind of terminal device, including：

Receiver, for receiving broadcast frame；

Acquiring unit, for if it is determined that the terminal device has the downlink data do not downloaded, in described at least one clothes In the service time indicated by wherein one or more service time information in business temporal information, obtained from the access device Downlink data.

The embodiment of the present invention also provides a kind of access device, including：

Second transmitter, for issuing broadcast frame；

Data distributing module, if there is the downlink data do not downloaded for terminal device, notifies that the terminal device has not The downlink data of download；Indicated by wherein one or more service time information at least one service time information Service time in, issue downlink data to the terminal device.

The embodiment of the present invention also provides a kind of communication system, including：

Access device as described in above-mentioned embodiment, and the core net being communicably connected with the access device Equipment.

As can be seen that in a kind of scheme provided in an embodiment of the present invention, the broadcast frame that access device is issued carries at least one Individual service time information, wherein, the service time information is used to indicate that the access device issues the service time of downlink data； If terminal device has the downlink data do not downloaded, access device notifies that terminal device has the downlink data do not downloaded, and at this In the service time indicated by wherein one or more service time information at least one service time information, to the terminal Equipment issues downlink data.At least one service window is opened because access device aims at it and issues downlink data, if certain end End equipment has the downlink data do not downloaded, what access device can be opened up at it be exclusively used in issue downlink data one of them or In multiple service windows, downlink data is issued to the terminal device, be so advantageous for avoiding the terminal of reporting uplink data from setting Competition transmission problem between terminal device that is standby and obtaining downlink data, advantageously reduces terminal device energy consumption.

In another scheme provided in an embodiment of the present invention, access device sends the downlink data frame of first terminal equipment； Wherein, the downlink data frame of first terminal equipment carries channel occupancy duration information, indicated by the channel occupancy duration information Duration, more than or equal to channel occupancy needed for the downlink data frame that access device issues second terminal equipment to second terminal equipment Duration it is part or all of；Access device sends second terminal and sets in the range of the duration indicated by channel occupancy duration information Standby downlink data frame.Because access device indicates it to next terminal using the downlink data frame issued to terminal device Equipment issues the part or all of of channel occupancy duration needed for downlink data, to shift to an earlier date reserve channel resource so that other terminals Equipment will not initiate competition in the channel occupancy duration of the reservation, and access device is given under starting in the channel occupancy duration The downlink data frame of one terminal device, such access device smoothly can issue downlink data frame to each terminal device successively, and The transmission competition between each terminal device is not resulted in, terminal device energy consumption is advantageously reduced, is conducive to preferably being applied to presence The communication scenes of more multi-terminal equipment.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also Other accompanying drawings are obtained with according to these accompanying drawings.

Fig. 1 is a kind of schematic flow sheet of downlink data transmission method provided in an embodiment of the present invention；

Fig. 2 is a kind of schematic flow sheet of downlink data transmission method provided in an embodiment of the present invention；

Fig. 3-a are a kind of schematic flow sheets of downlink data transmission method provided in an embodiment of the present invention；

Fig. 3-b are the schematic diagrames of service time Info information element provided in an embodiment of the present invention；

Fig. 4 is the schematic flow sheet of another downlink data transmission method provided in an embodiment of the present invention；

Fig. 5-a are the schematic flow sheets of another downlink data transmission method provided in an embodiment of the present invention；

Fig. 5-b are a kind of schematic diagrames of the reception response ACK of upstream data provided in an embodiment of the present invention；

Fig. 5-c are the schematic diagrames of the reception response ACK of another upstream data provided in an embodiment of the present invention；

Fig. 6-a are the schematic flow sheets of another downlink data transmission method provided in an embodiment of the present invention；

Fig. 6-b are a kind of form schematic diagrams of SIM provided in an embodiment of the present invention；

Fig. 6-c are a kind of mapping schematic diagrames of SIM and TIM provided in an embodiment of the present invention；

Fig. 6-d are the form schematic diagrams of another SIM provided in an embodiment of the present invention；

Fig. 6-e are a kind of downlink data transmission schematic diagrames provided in an embodiment of the present invention；

Fig. 7-a are a kind of schematic diagrames of access device provided in an embodiment of the present invention；

Fig. 7-b are the schematic diagrames of another access device provided in an embodiment of the present invention；

Fig. 8-a are a kind of schematic diagrames of terminal device provided in an embodiment of the present invention；

Fig. 8-b are the schematic diagrames of another terminal device provided in an embodiment of the present invention；

Fig. 8-c are the schematic diagrames of another terminal device provided in an embodiment of the present invention；

Fig. 9 is the schematic flow sheet of another downlink data transmission method provided in an embodiment of the present invention；

Figure 10 is a kind of downlink data transmission schematic diagram provided in an embodiment of the present invention；

Figure 11-a are the schematic diagrames of another access device provided in an embodiment of the present invention；

Figure 11-b are the schematic diagrames of another access device provided in an embodiment of the present invention；

Figure 11-c are the schematic diagrames of another access device provided in an embodiment of the present invention；

Figure 12 is a kind of schematic diagram of communication system provided in an embodiment of the present invention.

Specific embodiment

The embodiment of the present invention provides downlink data transmission method and relevant device and communication system, to improve downlink data biography The flexibility of defeated mechanism, reduces the data transfer competition between terminal device, and then be conducive to preferably suitable for there are more ends The communication scenes of end equipment.

It is described in detail individually below.

One embodiment of downlink data transmission method of the present invention, the method may include：Access device issues broadcast frame, should Broadcast frame carries at least one service time information, and the service time information is used to indicate that the access device issues downlink data Service time；If terminal device has the downlink data do not downloaded, access device notifies that the terminal device is not downloaded down Row data, and the service indicated by wherein one or more service time information in above-mentioned at least one service time information In time, downlink data is issued to the terminal device.

Be may include referring to Fig. 1, the step of a kind of downlink data transmission method of the embodiment of the present invention：

101st, access device issues broadcast frame；

Wherein, the broadcast frame that access device is issued herein for example can be broadcast beacon frame (Beacon frames) or other types Broadcast frame, wherein, the broadcast frame carry at least one service time information, wherein, the service time information be used for indicate The access device issues the service time of downlink data.

It is understood that access device can indicate this using multiple service time information of broadcast frame carrying connecing Enter equipment for issuing multiple service times of downlink data, and each service time information can indicate that the access device is used for Issue the different service times of downlink data.Wherein, at least one service time information each service time information is signified The access device for showing issues the service time of downlink data, for example, can be used for the access device to one or more different terminals Equipment issues downlink data, and the different terminal equipment for having the downlink data do not downloaded for example can issue lower line number in access device According to different service windows obtain downlink data, can so avoid each terminal device from being carried out when downlink data is obtained competing Strive, advantageously reduce terminal device energy consumption.Or, issue each service window of downlink data, access device in access device N number of terminal device is at most allowed to obtain downlink data (wherein, the big I of the N is set according to actual needs), in this way, Relative to the terminal device of all downlink datas for having and not downloading, the line number all in the case where same service window to be obtained to access device For, the transmission competition between terminal device is advantageously reduced, advantageously reduce terminal device energy consumption.And issued in access device The service window of downlink data, terminal device does not carry out transmitting uplink data, is so conducive to avoiding terminal device upstream data Competition between transmission and downlink data transmission, advantageously reduces terminal device energy consumption.

If the 102, terminal device has the downlink data do not downloaded, access device notifies that the terminal device is not downloaded down Row data, and the service indicated by wherein one or more service time information in above-mentioned at least one service time information In time, downlink data is issued to the terminal device.

It is appreciated that access device in the embodiment of the present invention can for access point, base station or other there is wireless access work( The network entity of energy.Wherein, the scheme of the embodiment of the present invention for example can be applied to wifi network or other similar networks.

As can be seen that the broadcast frame that access device is issued in the embodiment of the present invention, carries at least one service time information, Wherein, the service time information is used to indicate that the access device issues the service time of downlink data；If terminal device has not The downlink data of download, then access device notify that terminal device has a downlink data do not downloaded, and at least one service Between in service time indicated by wherein one or more service time information in information, issue lower line number to the terminal device According to.At least one service window is opened because access device aims at it and issues downlink data, if certain terminal device is not downloaded Downlink data, what access device can be opened up at it is exclusively used in issuing one or more service window of downlink data It is interior, downlink data is issued to the terminal device, so it is advantageous for avoiding the terminal device of reporting uplink data and obtains descending Competition transmission problem between the terminal device of data, advantageously reduces terminal device energy consumption.

In actual applications, access device can notify whether terminal device has the lower line number do not downloaded based on various ways According to.For example, access device can carry transmission indicating bit table TIM in broadcast frame, the terminal device for accessing is notified to be using TIM No have a downlink data do not downloaded, or access device also can after the upstream data that terminal device is reported is received, using to The reception of the upstream data that the terminal device sends responds to notify whether the terminal device has the downlink data do not downloaded, when So, access device also can notify whether terminal device has the downlink data do not downloaded by other message.

Below, respond as a example by whether notice terminal device has downlink data by the reception of upstream data by access device Row explanation.If for example, access device detects the downlink data that terminal device is not downloaded, can be sent to the terminal device The reception response of row data, wherein, reception response can carry the instruction of the first data, wherein, first data are indicated for referring to Show that the terminal device obtains downlink data (having the downlink data do not downloaded equivalent to the terminal device is indicated)；If access device is examined The downlink data that terminal device is not downloaded is measured, then the reception that can send upstream data to the terminal device is responded, should Receiving response can carry the instruction of the second data, wherein, second data are indicated for indicating what the terminal device was not downloaded Downlink data.Accordingly, terminal device then can be according to the first data instruction or second carried in the reception response for receiving Data indicate to determine the downlink data whether network side has it not download.

Or, if access device detects the downlink data of terminal device, access device can send to the terminal device The reception response of upstream data, can carry the instruction of the first data in reception response, wherein, first data are indicated for indicating The terminal device obtains downlink data (having the downlink data do not downloaded equivalent to the terminal device is indicated)；If detecting without eventually The downlink data that end equipment is not downloaded, the reception that access device can send upstream data to the terminal device is responded, wherein, this connects The second data instruction that the downlink data for indicating the terminal device not download is not carried in responding is received, and terminal device then may be used Indicate to determine that network side has a downlink data that it does not download according to the first data for being carried in response are received, terminal device is according to connecing Response is received not carry the instruction of the second data to determine the downlink data that network side is not downloaded without it.Or, if access device is examined The downlink data that terminal device is not downloaded is measured, access device is responded to the reception that the terminal device sends upstream data, its In, the first data for indicating the terminal device to have downlink data can not be carried in reception response and is indicated；If detecting without eventually The downlink data that end equipment is not downloaded, access device is responded to the reception that the terminal device sends upstream data, wherein, the reception The second data that the downlink data for indicating the terminal device not download is carried in response are indicated, and terminal device then can basis Receive and do not carry the first data in response and indicate to determine the downlink data that network side has it not download, terminal device can be according to connecing The second data for receiving response carrying indicate to determine the downlink data that network side is not downloaded without it.

In one embodiment of the invention, access device can periodically issue broadcast frame (such as broadcast beacon frame), should Broadcast frame can carry at least one service time information；Wherein, the service time information indicates access device to issue lower line number According to service start time and service duration, or, the service time information indicate access device issue downlink data service rise Time and service end time beginning, or, the service time information indicates access device to issue the service start time of downlink data Or service ending time (under this scene, it is descending that access device can otherwise notify the terminal device access device to issue The service duration of data, or bilateral agreement agreement etc.), or, the service time information indicates access device to issue downlink data Service duration (under this scene, access device can otherwise notify that the terminal device access device issues downlink data Service start time or service ending time, or bilateral agreement agreement etc.).Or, the service time information is used to indicate Go out terminal device and obtain downlink data (i.e. from the access device after the reception for receiving upstream data is responded：During the service Between information can indicate that access device issues the service window of downlink data and includes：Terminal device is received from access device A period of time after the reception response of upstream data, and under this scene, the service time information can also in the lump indicate access Equipment issues the service duration of downlink data, or access device can notify to be given under terminal device access device otherwise The service duration of row data, or bilateral agreement agreement etc.).

Additionally, in another embodiment of the invention, access device after the upstream data that receiving terminal apparatus are reported, if The downlink data that the terminal device is not downloaded is detected, the reception for sending the upstream data to the terminal device is responded, wherein, Reception response can carry second service temporal information, can also carry the first data and indicate (wherein, first data instruction The terminal device has the downlink data do not downloaded), wherein to can indicate that access device is issued descending for the second service temporal information The service start time and service duration of data, or, the second service temporal information indicates access device to issue downlink data Service start time and service ending time, or, the second service temporal information indicates access device to issue the clothes of downlink data (under this scene, access device can otherwise notify that the terminal device access sets for business initial time or service ending time The standby service duration for issuing downlink data, or bilateral agreement agreement), or the second service temporal information indicates access device to issue (under this scene, access device can otherwise notify that the terminal device access device is issued to the service duration of downlink data The service start time of downlink data, or bilateral agreement agreement etc.).Particularly, access device receiving terminal apparatus are reported After upstream data, if detecting the terminal device has the downlink data do not downloaded, access device is to being somebody's turn to do that the terminal device sends The reception response of upstream data can also carry second service temporal information and be indicated without carrying the first data, under this scene, if connecing Receive response and carry second service temporal information (bit that second service temporal information takes is effective value), then it represents that the end End equipment has a downlink data do not downloaded, and the specific value of second service temporal information then to may indicate that access device is issued descending The service start time (or service ending time) and/or service duration of data, if receiving response carries not the second service time The bit that information or the second service temporal information of carrying take is invalid value, then it represents that the terminal device is not downloaded Downlink data.If it is appreciated that access device indicates access to set by receiving the second service temporal information of response carrying The standby service start time (or service ending time) and/or service duration for issuing downlink data, then access device can be by each The time that terminal device obtains downlink data tries one's best arrangements of staggering, and different periods set to the terminal of access device acquisition downlink data Standby quantity can be as far as possible uniform, so can relative smooth network traffics, and terminal device be likely to can by non-competitive mechanism come Downlink data is obtained, and terminal device energy consumption can be advantageously reduced without obtaining downlink data by competition mechanism.

It can be seen that, it is assumed that after access device receives the upstream data that terminal device is reported, sent to the terminal device The reception response of the upstream data, wherein, the reception is responded for notifying whether the terminal device has the downlink data do not downloaded, Abandon using TIM to notify whether terminal device has the mechanism of the downlink data do not downloaded due to the program, and utilized terminal The reception of the upstream data that equipment is reported responds targetedly to notify whether the terminal device has existing downlink data, it is to avoid make With TIM, and then be conducive to controlling the size of Beacon frames；Also, because access device is reported using each terminal device The reception of upstream data responds to notify whether the terminal device has the downlink data do not downloaded, the pin of such downlink data notification It is stronger to property, be conducive to the flexibility of the informing mechanism of raising downlink data, and then be conducive to more preferable being applicable to there are more ends The communication scenes of end equipment, also, realized notifying by then passing through to the extension for receiving response, and then can introduce new Message, cost of implementation is relatively low.

Additionally, access device also can otherwise notify that terminal device, access device issue the service of downlink data Initial time (or service ending time) and/or service duration.Certainly, agreement can be also used between access device and terminal device The mode of agreement arranges service start time information and/or service duration that access device issues downlink data, and this scene Under, access device can notify that the access device of the terminal device agreement issues service start time (or the clothes of downlink data The business end time) and/or the information such as service duration.

Another embodiment of downlink data transmission method of the present invention, the method may include：Terminal device receives broadcast frame； Wherein, the broadcast frame carries at least one service time information, wherein, under the service time information is used to indicate access device Send out the service time of downlink data；If terminal device determines to have the downlink data do not downloaded, at least one service time In the service time indicated by wherein one or more service time information in information, lower line number is obtained from the access device According to.

201st, terminal device receives broadcast frame；

Wherein, the broadcast frame that terminal device is received herein can be broadcast beacon frame or other types of broadcast frame, its In, broadcast frame carries at least one service time information, and the service time information is used to indicate that access device issues lower line number According to service time.

It is understood that access device can indicate the access using multiple service time information of broadcast frame carrying Equipment is used to issue multiple service times of downlink data, and under each service time information can indicate that the access device is used for Send out the different service times of downlink data.Wherein, indicated by each the service time information at least one service time information Access device issue service time of downlink data, for example can be used for the access device and set to one or more different terminals It is standby to issue downlink data, and the different terminal equipment for having the downlink data do not downloaded for example can issue downlink data in access device Different service windows obtain downlink data, can so avoid each terminal device from being at war with when downlink data is obtained, Advantageously reduce terminal device energy consumption.Or, each service window of downlink data is issued in access device, access device is most Allow N number of terminal device to obtain downlink data (wherein, the big I of the N is set according to actual needs), in this way, relatively In the terminal device of all downlink datas for having and not downloading, all come to obtain downlink data to access device in same service window For, the transmission competition between terminal device is advantageously reduced, advantageously reduce terminal device energy consumption.And given under access device The service window of row data, terminal device does not carry out transmitting uplink data, is so conducive to avoiding terminal device upstream data from passing The defeated competition and between downlink data transmission, advantageously reduces terminal device energy consumption.

If the 202, terminal device determines to have the downlink data do not downloaded, in above-mentioned at least one service time information In service time indicated by wherein one or more service time information, downlink data is obtained from above-mentioned access device.

Wherein, the mode that terminal device obtains downlink data from access device for example can be that terminal device receives access and sets The standby downlink data for issuing；Or, terminal device can send energy-conservation inquiry PS-Poll message to access device, receive access and set The standby downlink data issued after the PS-Poll message is received.

It is appreciated that terminal device in the embodiment of the present invention can for the mobile terminals such as mobile phone, internet-of-things terminal equipment or Other types of terminal device.Wherein, the scheme of the embodiment of the present invention for example can be applied to wifi network or other similar networks.

As can be seen that the broadcast frame that the access device that terminal device is received in the present embodiment is issued, carries at least one and takes Business temporal information, wherein, the service time information is used to indicate that the access device issues the service time of downlink data；If eventually End equipment determines to have the downlink data do not downloaded, then wherein one or more clothes in above-mentioned at least one service time information In service time indicated by business temporal information, downlink data is obtained from above-mentioned access device.Because access device is aimed under it Hair downlink data opens at least one service window, is so advantageous for avoiding terminal device and the acquisition of reporting uplink data Competition transmission problem between the terminal device of downlink data, advantageously reduces terminal device energy consumption.If certain terminal device has not The downlink data of download, when what access device can be opened up at it is exclusively used in one or more service for issuing downlink data In section, downlink data is obtained from above-mentioned access device, be so conducive to improving data transmission efficiency, reduce competition status transmission.

In actual applications, access device can notify whether terminal device has the lower line number do not downloaded based on various ways According to.For example, access device can carry TIM in broadcast frame, notify whether the terminal device for accessing has what is do not downloaded using TIM Downlink data, or, access device can also be sent out after the upstream data that terminal device is reported is received using to the terminal device The reception of the upstream data for sending responds to notify whether the terminal device has the downlink data do not downloaded, certainly, access device Also can notify whether terminal device has the downlink data do not downloaded by other message.And terminal device can determine according to notice Go out whether the terminal device has the downlink data do not downloaded.

Accordingly, if terminal device determines to have the downlink data do not downloaded, terminal device to be carried at least in broadcast frame In the service time indicated by wherein one or more service time information in one service time information, set from above-mentioned access It is standby to obtain downlink data.

For example, if the service time information that broadcast frame is carried is used to indicate that access device issues the clothes of downlink data Business initial time and service duration, then terminal device can be in wherein at least one service time information that broadcast frame is carried In the range of the service duration after service start time indicated by individual (or multiple) service time information, obtained from the access device Downlink data.Further, in order to reduce the competition probability of the transmission between terminal device, when terminal device can first generate random yielding It is long, indicated by one of them (or multiple) the service time information at least one service time information that broadcast frame is carried Service start time plus this it is random yielding duration after, from the access device obtain downlink data, wherein, the random yielding When access device of the duration less than this indicated by one of them (or multiple) service time information issues the service of downlink data It is long.

If again for example, the service time information that broadcast frame is carried is used to indicate that access device issues the service of downlink data End time and service duration, then terminal device can be in one of them at least one service time information that broadcast frame is carried In the range of the service duration before service ending time indicated by (or multiple) service time information, obtained from the access device Downlink data.

If again for example, the service time information that broadcast frame is carried is used to indicate that access device issues the service of downlink data Initial time, then terminal device can be in one of them at least one service time information that broadcast frame is carried (or multiple) clothes In the range of the setting service duration after service start time indicated by business temporal information, lower line number is obtained from the access device According to.Further, in order to reduce the competition probability of the transmission between terminal device, terminal device can first generate random yielding duration, The clothes indicated by one of them (or multiple) service time information at least one service time information that broadcast frame is carried After business initial time is plus the random yielding duration, downlink data is obtained from the access device, wherein, this makes a concession duration at random Less than the service duration that the access device of setting issues downlink data.

If again for example, the service that the service time information that broadcast frame is carried is used to indicate access device to issue downlink data rises Time and service end time beginning, then terminal device can be in wherein at least one service time information that broadcast frame is carried After service start time indicated by individual (or multiple) service time information, and one of them (or multiple) service time at this Before service ending time indicated by information, downlink data is obtained from the access device.Further, set to reduce terminal Transmission competition probability between standby, terminal device can first generate random yielding duration, at least one service that broadcast frame is carried Between service start time indicated by one of them service time information in information plus the random yielding duration after, from connecing Enter equipment and obtain downlink data, wherein, the service start time indicated by one of them the service time information is random plus this Duration is made a concession, less than the service ending time indicated by one of them the service time information.

If again for example, the service time information that broadcast frame is carried is used to indicate that access device issues the service of downlink data End time, then terminal device can be in one of them at least one service time information that broadcast frame is carried (or multiple) clothes In the range of the setting service duration before service ending time indicated by business temporal information, lower line number is obtained from the access device According to；

If again for example, when the service time information that broadcast frame is carried is used to indicate access device to issue the service of downlink data Long, then terminal device after the service start time that the access device of setting issues downlink data, and can be carried in broadcast frame At least one service time information in one of them service time information indicated by service duration in the range of, from the access Equipment obtains downlink data.Further, in order to reduce the transmission between terminal device competition probability, terminal device can first generate with Machine makes a concession duration, after the service start time that the access device of setting issues downlink data adds random yielding duration, from The access device obtains downlink data, wherein, this makes a concession duration less than at least one service time letter that broadcast frame is carried at random The service duration indicated by one of them (or multiple) service time information in breath.

Accordingly, if the reception response that terminal device is received carries second service temporal information and the first data refer to Show, wherein, second service temporal information indicates that access device issues the service start time and service duration of downlink data, then Terminal device can be obtained in the range of the service duration after the service start time indicated by the second temporal information from access device Take downlink data.Further, in order to reduce the competition probability of the transmission between terminal device, terminal device can first generate random yielding Duration, after random yielding duration, sets plus this in the service start time indicated by second service temporal information from the access Standby to obtain downlink data, wherein the random yielding duration is less than under the access device indicated by the second service temporal information and gives The service duration of row data.

If again for example, the second service temporal information that the reception response that terminal device is received is carried is used to indicate access Equipment issues the service ending time and service duration of downlink data, then terminal device can be signified in the second service temporal information In the range of service duration before the service ending time for showing, downlink data is obtained from the access device.

Or, if the second service temporal information that the reception response that terminal device is received is carried indicates access device to issue The service start time of downlink data, then terminal device can be after the acquisition initial time indicated by second service temporal information Setting service duration in the range of (wherein, the access device of the setting issues the service duration of downlink data, for instance it can be possible that eventually End equipment is according to the acquisition of issuing a separate notice of access device, or bilateral agreement agreement), obtain lower line number from the access device According to；Or, terminal device also can be in any time after the acquisition initial time indicated by second service temporal information, from this Access device obtains downlink data.Further, in order to reduce the competition probability of the transmission between terminal device, terminal device can Mr. Duration is made a concession into random, the service start time indicated by the second service temporal information that response is carried is random plus this receiving Make a concession after duration, downlink data is obtained from the access device, wherein, this makes a concession under access device of the duration less than setting at random Send out the service duration of downlink data.

Or, if the second service temporal information that the reception response that terminal device is received is carried, indicates access device The service duration of downlink data is issued, then terminal device can issue the service start time of downlink data in the access device of setting (wherein, the access device of the setting issues the service start time of downlink data, for instance it can be possible that terminal device is according to connecing afterwards Enter the acquisition of issuing a separate notice of equipment, or bilateral agreement agreement) second service temporal information indicated by service duration scope It is interior, obtain downlink data from access device.Further, in order to reduce the competition probability of the transmission between terminal device, terminal device A random yielding duration can be first generated, the service start time for issuing downlink data in the access device of setting is random plus this Make a concession after duration, downlink data is obtained from the access device, wherein, this makes a concession duration less than second service temporal information at random Indicated service duration.

If again for example, the second service temporal information of the reception response carrying that terminal device is received, connects for indicating Enter service ending time and service ending time that equipment issues downlink data, then terminal device can be in second service temporal information After indicated service start time, and before the service ending time indicated by the second service temporal information, from this Access device obtains downlink data.Further, in order to reduce the competition probability of the transmission between terminal device, terminal device can Mr. Duration is made a concession into random, after the service start time indicated by second service temporal information adds the random yielding duration, Downlink data is obtained from access device, wherein, the service start time indicated by second service temporal information is moved back at random plus this Duration is allowed, less than the service ending time indicated by the second service temporal information.

For ease of being better understood from and implementing the such scheme of the embodiment of the present invention, below by several under wifi network Concrete application scene is illustrated.

Application examples one

It is main in the application example that Beacon frames are passed through with AP, notify that terminal device AP issues the service time of downlink data, Whether AP has as a example by the downlink data do not downloaded by the reception response notice terminal device of upstream data.

Be may include referring to Fig. 3-a, a kind of downlink data transmission method provided in an embodiment of the present invention：

301st, AP periodically sends Beacon frames；

Wherein, AP Beacon frames carry indicate AP issue downlink data service time (such as service start time and/or Service duration etc.) configured information；

In one embodiment of the invention, the new cell (IE) of such as definable 1, can claim service time Info information element, In the Beacon frames that AP carries the service time Info information element, AP is indicated using the service time Info information element to terminal device AP issues the service time of downlink data.

Referring to Fig. 3-b, a kind of form of service time Info information element can be shown in Fig. 3-b, it may include：

Element id fields, Length fields, SP Start fields and SP Duration fields.

Wherein, Element id fields：Source identity is carried, the new Element ID of definable 1, Element id fields are taken With the new Element ID, the Element ID indicate the IE for service time Info information element, and service time Info information element is used Service time of downlink data etc. is issued in AP is indicated.

Length fields：Carry the length information of the service time Info information element；

SP Start fields：Carry the configured information that AP issues the service start time of downlink data, SP Start fields The service start time that AP issues downlink data can be for example carried, the service start time that SP Start fields are carried can be One absolute time, or can also be the shift time amount that time point is sent relative to the last Beacon frames, or Person can also be last several bytes of the time field in time synchronized function (TSF) cell, or other can be indicated AP issues the configured information of the service start time of downlink data；

SP Duration fields：The configured information that AP issues the service duration of downlink data is carried, AP issues downlink data Service duration can be in units of delicate.

It is understood that also may not include SP Start fields or SP Duration words in service time Info information element Section, if not including SP Start fields, AP can otherwise notify that the terminal device AP issues the service of downlink data Initial time, or AP and terminal device can arrange the service start time that the AP issues downlink data；If not including SP Duration fields, then AP can otherwise notify that the terminal device AP issues the service duration of downlink data, or AP Can arrange the service duration that the AP issues downlink data with terminal device.

As can be seen that the Beacon frames that AP periodically sends, if partly or entirely carrying service time letter in Beacon frames Breath cell, then receive the service time Info information element that the terminal device of Beacon frames can be carried according to the Beacon frames, knows AP issues service start time and/or service duration of downlink data etc..

302nd, terminal device is periodically to AP reporting uplink data；

In one embodiment of the invention, for example in intelligent sensing network or intelligence instrument application, terminal device with After AP associations, terminal equipment configuration is periodically reported data, i.e. terminal device periodically toward line number in AP transmissions by AP According to terminal device periodically can report the upstream data such as sensing data or intelligence instrument data to AP.AP receive it is up The reception that can send the upstream data to terminal device after data responds ACK, and expression have received the upstream data.

303rd, the upstream data that AP receiving terminal apparatus are reported, AP rings to the reception that the terminal device sends the upstream data Answer ACK；

Wherein, if AP detects the current terminal device and has the upstream data do not downloaded, AP can be in the upstream data Receive and carry in response ACK, the configured information of the downlink data for indicating the terminal device to have not download (can claim the first data Indicate)；If AP detects the upstream data that the current terminal device is not downloaded, AP can ring in the reception of the upstream data Answer carrying in ACK, the configured information (the first data can be claimed to indicate) of the upstream data do not downloaded for instruction terminal equipment.

In one embodiment of the invention, for example using the more data in the reception response ACK of upstream data (More Data) flag comes whether instruction terminal equipment has the upstream data do not downloaded.If in for example receiving response ACK More Data flags are set to 1, then it represents that the terminal device has the downlink data do not downloaded；If by More Data flags It is set to 0, then it represents that the downlink data that the terminal device is not downloaded, vice versa.

304th, terminal device receives the reception response ACK of upstream data；

Wherein, more Data flag values in the reception response ACK that terminal device detection is received, if more Data Value is 0, then terminal device determines the downlink data that network side is not downloaded without it, and terminal device can dormancy wait reception next time Beacon frames or next time are to AP reporting uplink data；If More Data flags value is 1, terminal device determines network There is the downlink data that it is not downloaded side.

It is appreciated that also the extension of other manner (such as increasing indication field etc. newly) can be carried out to receiving response ACK, make Receive response ACK can instruction terminal equipment whether have the downlink data do not downloaded, no longer illustrate one by one herein.

If it is determined that network side has the downlink data that it does not download, then terminal device can be in the clothes in Beacon frames for terminal device The service start time that AP indicated by business temporal information cell issues downlink data is waken up, and is competed and is disappeared to AP transmissions PS-Poll Breath, then receives the downlink data that AP is issued；Or, terminal device can not also be competed and send PS-Poll message to AP, and can quilt The downlink data that the AP to be received such as dynamic is issued.

As can be seen that in the present embodiment AP using Beacon frames indicate AP issue downlink data service start time and/ Or service duration, terminal device is to AP reporting uplink data；If receiving the reception of the upstream data from the access device Response, and according to the reception for receiving in response to determining that going out the terminal device has the downlink data do not downloaded, then terminal device can The AP indicated according to Beacon frames issues the service start time and/or service duration of downlink data, and lower line number is obtained from the AP According to.The current mechanism for having abandoned using TIM to notify terminal device whether to have the downlink data do not downloaded due to the program, and it is sharp The reception of the upstream data reported with terminal device responds targetedly to notify whether the terminal device has existing downlink data, Avoid using existing TIM, and then be conducive to controlling the size of Beacon frames；And because AP is reported using each terminal device The reception response of upstream data notify whether the terminal device has the downlink data do not downloaded, such downlink data notification Specific aim is stronger, be conducive to improve downlink data informing mechanism flexibility, and then be conducive to preferably be applicable exist it is more The communication scenes of terminal device, also, realized notifying by then passing through to the extension for receiving response, and then can be new without introducing Message, cost of implementation is relatively low.

Application examples two

It is main in the application example that Beacon frames are passed through with AP, notify that terminal device is responded in the reception for receiving upstream data After obtain upstream data, AP notifies whether terminal device has the downlink data do not downloaded to be by the reception response of upstream data Example.Be may include referring to Fig. 4, another downlink data transmission method provided in an embodiment of the present invention：

401st, AP periodically sends Beacon frames；

Wherein, AP carries the second temporal information in Beacon frames, and the second temporal information is used for instruction terminal equipment and is receiving After to the reception response of upstream data downlink data is obtained from the access device.I.e.：Second temporal information indicates to be given under AP The service window of row data receives a period of time after the reception response of downlink data including terminal device, that is to say, that the Two temporal information instruction terminal equipment can be obtained under it after the reception for receiving the downlink data from AP is responded from AP Row data.Under this scene, the second temporal information can also in the lump indicate that AP issues the service duration of downlink data, or AP can pass through Other manner notifies that terminal device AP issues the service duration of downlink data, or bilateral agreement agreement etc..

Wherein, the second temporal information can be carried by the Capability information bits of Beacon frames, or can be by other Mode notifies terminal device.

As can be seen that the Beacon frames that AP periodically sends, if partly or entirely carrying the second time letter in Beacon frames Breath, then receive the second temporal information that the terminal device of the Beacon frames can be carried according to the Beacon frames, knows that AP is issued The service window of downlink data including terminal device receive downlink data reception response after a period of time.

402nd, terminal device is periodically to AP reporting uplink data；

403rd, the upstream data that AP receiving terminal apparatus are reported, AP rings to the reception that the terminal device sends the upstream data Answer ACK；

404th, terminal device receives the reception response ACK of upstream data；

If it is determined that network side has its downlink data, then terminal device can for example receive the upstream data to terminal device Receive in the setting duration after response ACK, compete and send PS-Poll message to AP, then receive the downlink data that AP is issued； Or terminal device can not also be competed and send PS-Poll message to AP, and can downlink data that passively etc. AP to be received is issued.

Practice finds that such scheme is relatively adapted to when the Beacon frame periods are more long, and the terminal device of AP services is less Scene, further reduces the energy consumption of terminal device.Because AP needs to distribute more data transmission periods to each terminal device, Reported including data and possible downlink data transmission.Therefore each AP can be serviced or the terminal device quantity that associate may be answered relatively The terminal device quantity of the scheme of use-case one is few.

As can be seen that the present embodiment AP can be rung using Beacon frame instruction terminals equipment in the reception for receiving upstream data Ying Houcong access device acquisition downlink datas；Terminal device is to AP reporting uplink data；If receiving from the access device The upstream data reception response, and according to the reception for receiving in response to determining that going out the terminal device has do not download descending Data, the then AP that terminal device can be indicated according to Beacon frames issues the service start time and/or service duration of downlink data, Downlink data is obtained from the AP.Abandon using TIM to notify whether terminal device has the downlink data do not downloaded due to the program Current mechanism, and whether the reception of the upstream data reported using terminal device response targetedly notifies the terminal device There is existing downlink data, it is to avoid use existing TIM, and then be conducive to controlling Beacon frame signs；And because AP is using every The reception of the upstream data that individual terminal device is reported responds to notify whether the terminal device has the downlink data do not downloaded, so The specific aim of downlink data notification is stronger, is conducive to the flexibility of the informing mechanism of raising downlink data, and then is conducive to more preferably The communication scenes being applicable in the presence of more multi-terminal equipment, also, realized notifying by then passing through to the extension for receiving response, enter And new message can be introduced, cost of implementation is relatively low.

Application examples three

It is main in the application example to be responded by the reception of upstream data with AP, notify that terminal device AP issues downlink data As a example by service time.Be may include referring to Fig. 5-a, another downlink data transmission method provided in an embodiment of the present invention：

501st, terminal device is periodically to AP reporting uplink data；

502nd, the upstream data that AP receiving terminal apparatus are reported, AP rings to the reception that the terminal device sends the upstream data Answer ACK；

Additionally, AP also using receive response ACK notify terminal device AP issue downlink data service start time and/ Or service acquisition duration.

For example shown in Fig. 5-b, existing reception response ACK can be carried out extended below：

The newly-increased Allocation Start fields of response ACK are being received, using Allocation Start fields to terminal Equipment indicates AP to issue the service start time of downlink data.The AP that Allocation Start fields are carried issues downlink data Service start time can be an absolute time, or may also be and send time point relative to the last Beacon frames One shift time amount, or can also be last several bytes of time field in time synchronized function (TSF) cell, or It is that other can indicate AP to issue the configured information of the service start time of downlink data.

For example when the More Data flags in Frame Control fields are set to 1, then it represents that the terminal device There is the downlink data do not downloaded, Allocation Start fields indicate that AP issues the service start time of downlink data；If More Data flags are set to 0, then it represents that the downlink data that the terminal device is not downloaded, vice versa.Especially , can not also utilize More Data flags to indicate whether the terminal device has the downlink data do not downloaded, and utilize Allocation Start fields had both indicated that AP issued the service start time of downlink data, indicated the terminal device to have not again The downlink data of download, if for example, including Allocation Start fields in receiving response ACK, then it represents that terminal device has The downlink data do not downloaded, and the specific value of Allocation Start fields then indicates that AP issues the service of downlink data Initial time, or, if comprising Allocation Start fields and Allocation Start fields in receiving response ACK Value is not zero or is not certain invalid value, then it represents that terminal device has a downlink data do not downloaded, and Allocation Start The specific value of field then indicates that AP issues the service start time of downlink data.

For example shown in Fig. 5-c, Allocation Duration words can be also increased on the basis of the form as shown in Fig. 5-b Section, Allocation Duration fields are used to indicate AP to issue the service duration of downlink data, and AP issues the clothes of downlink data Business duration can be in units of delicate.

It is understood that extension reception response ACK in also may not include Allocation Start fields or Allocation Duration fields, if not including Allocation Start fields, AP can otherwise notify end The end equipment AP issues the service start time of downlink data, or AP and terminal device can arrange the AP and issue downlink data Service start time；If not including Allocation Duration fields, AP can otherwise notify that terminal device should AP issues the service duration of downlink data, or AP and terminal device can arrange the service duration that the AP issues downlink data.

503rd, terminal device receives the reception response ACK of the upstream data from AP；

If it is determined that network side has its downlink data, then terminal device can receive response ACK's to terminal device The service start time that AP indicated by Allocation Start fields issues downlink data is waken up, in Allocation Duration fields (if existing in receiving response ACK) indicate AP to issue in the range of the service duration of downlink data, compete to AP PS-Poll message is sent, the downlink data that AP is issued then is received；Or terminal device can not also be competed and send PS- to AP Poll message, and the service of downlink data can be issued in the AP indicated by the Allocation Start fields of reception response ACK Initial time is waken up, the downlink data that the AP to be received such as passive is issued.

Practice find, the scheme in application examples three compared with the scheme in application examples one, due to AP reply terminal device on In the reception response ACK of row data, in addition to indicating whether not downloading downlink data, also further specify that and set to the terminal The standby time for obtaining downlink data, terminal device can wake up reception downlink data in the specified time, be conducive to avoiding itself and its The competition of its terminal device, and then be conducive to further reducing terminal device energy consumption.

As can be seen that whether the application example AP is not downloaded down using the reception response instruction terminal equipment of upstream data Row data, and AP issues service time and/or the service duration of downlink data；Terminal device is to AP reporting uplink data；If connecing The reception response of the upstream data from the access device is received, and according to the reception for receiving in response to determining that going out the terminal Equipment has the downlink data do not downloaded, then the AP that terminal device can be indicated according to Beacon frames issues the service starting of downlink data Time and/or service duration, downlink data is obtained from the AP.Abandon using TIM whether to notify terminal device due to the program There is the current mechanism of the downlink data do not downloaded, and the reception of the upstream data reported using terminal device response is come targetedly Notify whether the terminal device has existing downlink data, it is to avoid use existing TIM, and then be conducive to controlling Beacon frame signs； And because the reception that AP is the upstream data reported using each terminal device responds to notify whether the terminal device has not The downlink data of download, the specific aim of such downlink data notification is stronger, is conducive to the spirit of the informing mechanism of raising downlink data Activity, and then be conducive to preferably being applicable the communication scenes in the presence of more multi-terminal equipment, also, by then passing through to receiving response Extension realize notifying that and then can introduce new message, cost of implementation is relatively low.

Application examples four

It is main in the application example that Beacon frames are passed through with AP, notify that terminal device AP issues the service time of downlink data, Wherein, AP is that different terminal devices are distributed different service times, and AP notifies whether terminal device has not by Beacon frames As a example by the downlink data of download.

Be may include referring to Fig. 6-a, a kind of downlink data transmission method provided in an embodiment of the present invention：

601st, AP periodically sends Beacon frames；

Wherein, AP Beacon frames can carry TIM and several service time information (as indicate service start time and/ Or service duration etc.), wherein, each service time information indicates respectively that AP is have the different terminal equipment for not downloading downlink data The service time (SP) for issuing downlink data of distribution.

In one embodiment of the invention, the new cell (IE) of definable 1, can claim service time information bit table (SIM, SP Indication Map), in the Beacon frames that AP can carry the SIM, AP is not downloaded down using the SIM to each The terminal device of row data, indicates AP that the service time of downlink data is issued to it.

For example, a kind of form of the SIM of citing can be as shown in Fig. 6-b.

Wherein, if SIM shown in Fig. 6-b includes individual SP indication fields, each field is used to not download downlink data to having Different terminal equipment, indicates AP that the service time SP of downlink data is issued to it.For example, SP1 indicates AP under terminal device 1 The service time of downlink data is sent out, for example, SP2 indicates that AP issues the service time of downlink data to terminal device 2, with such Push away.

Referring to Fig. 6-c, the TIM and the corresponding relation of SIM that Beacon frames are carried can be as shown in Fig. 6-c.

For example, AP is that terminal device corresponding to 1 indicating bit (represents that the terminal device has not to the 1st value in TIM The downlink data of download) service time of downlink data is issued, referred to by the first SP indication field (SP1 can be claimed) in SIM Show, AP passes through to the service time that the 2nd value in TIM is that terminal device corresponding to 1 indicating bit issues downlink data Second SP indication field (can claim SP2) in SIM is indicated, by that analogy.

It is appreciated that in actual applications also each SP indication fields in SIM can also be determined by other mapping relations Corresponding terminal device.

Referring to Fig. 6-d, Fig. 6-d are the forms of the alternative SIM of embodiment of the present invention citing.

Wherein, the SIM shown in Fig. 6-d is included：

Time started information field, for indicating the time started；

Unit time field, for indicating unit time t；

SP indicating length fields, the length n for indicating SP indication fields；

Several SP indication fields, for indicating AP to there is the different terminal equipment for not downloading downlink data to issue lower line number According to service duration (number of the unit time of occupancy)

It is understood that can not include time started information field, unit time field and SP indicating lengths in SIM yet One or more in field, and the indicated value of these fields not included in SIM, AP and terminal device can use various ways Agreement is notified.

It is assumed that carrying unit time field and SP indicating length fields in SIM every time, then AP can be according to actual downstream number According to size and length, optimal t (value that i.e. unit time field is carried) and n (i.e. SP instructions are calculated in hair TIM every time The value that length field is carried).If additionally, the value that unit time field and SP indicating lengths field are carried is consolidated in network configuration Surely use, AP and STA is known in advance, then without carrying in SIM, without often change.

The time that downlink data starts that issues can also be carried in SIM.If specify the time started, the time started with Afterwards, AP can send downlink data to each terminal device successively according to the time distributed for each terminal device；If SIM does not have Have the specified time started, then can for example arrange the time started be Beacon frames transmission after.

602nd, AP sends in the service time for issuing downlink data distributed for each terminal device to each terminal device Downlink data.

Because terminal device can know when the downlink data AP of oneself is issuing by SIM, so terminal device Dormancy usually may be selected, time is up wakes up receptions again, after having received and continuation dormancy, the effect of power saving is reached with this.

Below with one more specifically example illustrate.

Assuming that the parameter such as pre-configured t of system (i.e. unit time), n (length of SP indication fields).

Such as t=20us (microsecond), n=4bit.

Assuming that the TIM that the broadcast frame that certain AP sends is carried, indicates have three terminal devices not download downlink data, 1st indicating bit in TIM, the 3rd indicating bit and the 4th indicating bit are 1.AP carries three SP in the SIM that broadcast frame is carried and indicates word Section.

Assuming that the 1st terminal device (such as STA1) AP needs 65us to issue downlink data, the 2nd terminal device (such as STA2) AP needs 188us to issue downlink data, and the 3rd terminal device (such as STA3) AP needs 89us to issue downlink data, then AP gives STA1 distribution time for can 4 t (common 20*4=80us), to STA2 distribution time can be 10 t (common 200us), give STA3 distributes 5 t (common 100us).Certainly, as the case may be, the value of t and n can be adjusted correspondingly, with what is be optimal Effect.

AP is respectively 80us, 200us, 100us to the time of 3 STA distribution, initial time be defaulted as broadcast frame end with Afterwards (assuming that not specifying the time started).For example shown in Fig. 6-e, after broadcast frame end, STA1 starts to receive AP to it The downlink data (such as DL data1) of transmission, now STA2 and STA3 can dormancy, the downlink data transmission takes 65us, transmission knot Shu Hou, STA1 can dormancy；At this time there is the time of 80-65=15us, down channel is idle, but because AP is in SIM In indicated to occupy channel resource, so do not have other AP or STA to rob use, so this 15us does not transmit number According to；At the end of waiting until 80us always, STA2 starts to wake up, and AP also starts to send downlink data (such as to STA2 at this moment DL data2).Send after 188us, STA2 has been received, can be with dormancy；When 80+200=280us, STA3 wakes up Come, downlink data is received in manner described above, the like.

If additionally, AP calculate every time optimal t and n values (channel that the judgement of optimal value may be referred to waste is the smaller the better, The more short aspect such as better of the length of SIM is accounted for), and it is reducible fix at the beginning of hair downlink data between, these information are led to Cross SIM and TIM is broadcasted together.After STA receives broadcast frame, the t and n that can be carried by SIM, and the residing reception of oneself The order of downlink data, adds between issuing at the beginning of downlink data, judge oneself should when wake up reception it is descending Data, STA can continue dormancy again after having received downlink data.

As can be seen that AP is indicated using Beacon frames in the present embodiment, AP is that issuing for different terminal equipment distribution is descending The service time of data, AP gives each terminal device in the service time for issuing downlink data distributed for each terminal device Send downlink data.The program aims at the service window that the distribution of each terminal device issues downlink data due to access device, this The competition transmission that sample is advantageous for avoiding between the terminal device of the terminal device of reporting uplink data and acquisition downlink data is asked Topic, and the competition transmission problem between the terminal device of each reporting uplink data, advantageously reduce terminal device energy consumption.

For ease of being better understood from and implementing the such scheme of the embodiment of the present invention, it is also provided below for implementing above-mentioned side The relevant apparatus of case.

Referring to Fig. 7-a, the embodiment of the present invention provides a kind of access device 700, it may include：Second transmitter 710 and data Issue module 720.

Second transmitter 710, for issuing broadcast frame；Wherein, the broadcast frame carries at least one service time information, its In, the service time information is used to indicate that access device 700 issues the service time of downlink data；

Data distributing module 720, if there is the downlink data do not downloaded for terminal device, notifies that the terminal device has not The downlink data of download；Indicated by wherein one or more service time information in above-mentioned at least one service time information Service time in, issue downlink data to the terminal device.

In one embodiment of the invention, data distributing module 720 can be specifically for if terminal device has what is do not downloaded Downlink data, then notify that terminal device has the lower line number do not downloaded using the transmission indicating bit table carried in above-mentioned broadcast frame According to；The clothes indicated by wherein one or more service time information at least one service time information that broadcast frame is carried In the business time, downlink data is issued to the terminal device.

Referring to Fig. 7-b, in another embodiment of the present invention, access device 700 may also include receiver 730, be used for The upstream data that receiving terminal apparatus are reported；Data distributing module 720 can be specifically for, if terminal device has do not download descending Data, the then reception for sending the upstream data to the terminal device is responded, wherein, the reception is responded for notifying the terminal device Whether the downlink data do not downloaded is had；Wherein one or more clothes at least one service time information that broadcast frame is carried In service time indicated by business temporal information, downlink data is issued to the terminal device.

Wherein, the service time information that broadcast frame is carried, may be used to indicate out the clothes that access device 700 issues downlink data Business initial time and service duration, or, the service time information is used to indicate that access device 700 issues the clothes of downlink data Business end time and service duration, or, the service time information is used to indicate that access device 700 issues the clothes of downlink data Business initial time and/or service ending time, or, the service time information indicates access device 700 to issue downlink data Service duration.

It is appreciated that access device 700 in the embodiment of the present invention can for access point, base station or other there is wireless access The network entity of function.Wherein, the scheme of the embodiment of the present invention for example can be applied to wifi network or other similar networks.

It is understood that the access device 700 in the present embodiment can be such as the access device in above-mentioned embodiment of the method, its The function of each functional module can be implemented according to the method in above method embodiment, and it implements process can join According to the associated description of above method embodiment, here is omitted.

Referring to Fig. 8-a, the embodiment of the present invention provides a kind of terminal device 800, it may include：Receiver 810 and acquiring unit 820。

Receiver 810, for receiving broadcast frame；Wherein, the broadcast frame carries at least one service time information, the service Temporal information is used to indicate that access device issues the service time of downlink data；

Acquiring unit 820, for if it is determined that terminal device 800 has the downlink data do not downloaded, above-mentioned at least one In the service time indicated by one or more service time information in service time information, from above-mentioned access device Obtain downlink data.

Referring to Fig. 8-b, in one embodiment of the invention, the broadcast frame that receiver 810 is received also carries transmission and refers to Show a table, acquiring unit 820 may include：

First determination sub-module 821, under determining whether the terminal device has not according to the transmission indicating bit table The downlink data of load；

First acquisition submodule 822, if determining that terminal device 800 has what is do not downloaded for the first determination sub-module 821 Downlink data, the service indicated by wherein one or more service time information in above-mentioned at least one service time information In time, downlink data is obtained from the access device；

Referring to Fig. 8-c, in another embodiment of the present invention, terminal device 800 may also include：

Transmitter 830, for access device reporting uplink data；

Receiver 810 is additionally operable to, and receives the reception response of the upstream data from access device；

Acquiring unit 820 may include：Second determination sub-module, the reception response for being received according to receiver 810 is true Determine whether terminal device 800 has the downlink data do not downloaded；

Second acquisition submodule, if determining that terminal device 800 has the lower line number do not downloaded for the second determination sub-module According to the service time indicated by wherein one or more service time information in above-mentioned at least one service time information It is interior, obtain downlink data from access device.

In one embodiment of the invention, acquiring unit 820 can be specifically for if the broadcast frame that receiver 810 is received The service time information of carrying is used to indicate that access device issues the service start time and service duration of downlink data, and really Making terminal device 800 has the downlink data do not downloaded, then broadcast frame carry at least one service time information in its In in the range of service duration after service start time indicated by a service time information, obtain lower line number from access device According to；

Or,

Acquiring unit 820 can be specifically for if the service time information that the broadcast frame that receiver 810 is received is carried be used to refer to Show that access device issues the service ending time and service duration of downlink data, and determine that terminal device 800 is not downloaded Downlink data, then broadcast frame carry at least one service time information in one of them service time information indicated by Service ending time before service duration in the range of, from access device obtain downlink data；

Or,

Acquiring unit 820 can be specifically for if the service time information that the broadcast frame that receiver 810 is received is carried be used to refer to Show that access device issues the service start time of downlink data, and determine that terminal device 800 has the downlink data do not downloaded, The then service starting indicated by one of them the service time information at least one service time information that broadcast frame is carried In the range of setting service duration after time, downlink data is obtained from access device；

Or,

Acquiring unit 820 can be specifically for if the service time information that the broadcast frame that receiver 810 is received is carried be used to refer to Show that the access device issues the service start time and service ending time of downlink data, and determine that terminal device 800 has The downlink data do not downloaded, then broadcast frame carry at least one service time information in one of them service time information After indicated service start time, and before the service ending time indicated by one of them the service time information, Downlink data is obtained from access device；

Or,

Acquiring unit 820 can be specifically for if the service time information that the broadcast frame that receiver 810 is received is carried be used to refer to Show that the access device issues the service ending time of downlink data, and determine that terminal device 800 has do not download descending Data, the then service indicated by one of them the service time information at least one service time information that broadcast frame is carried In the range of setting service duration before end time, downlink data is obtained from access device；

Or,

Acquiring unit 820 can be specifically for if the service time information that the broadcast frame that receiver 810 is received is carried be used to refer to Show that the access device issues the service duration of downlink data, and determine that terminal device 800 has the downlink data do not downloaded, then After the service start time that the access device of setting issues downlink data, and at least one service that broadcast frame is carried Between in the range of service duration indicated by one of them service time information in information, obtain downlink data from access device.

It is appreciated that the terminal device 800 in the embodiment of the present invention can be mobile terminal, the internet-of-things terminal equipment such as mobile phone Or other types of terminal device.Wherein, the scheme of the embodiment of the present invention for example can be applied to wifi network or other similar nets Network.

It is understood that the terminal device 800 in the present embodiment can be such as the terminal device in above-mentioned embodiment of the method, its The function of each functional module can be implemented according to the method in above method embodiment, and it implements process can join According to the associated description of above method embodiment, here is omitted.

Another embodiment of downlink data transmission method of the present invention, it may include：Access device sends first terminal equipment Downlink data frame；Wherein, the downlink data frame of first terminal equipment carries channel occupancy duration information, the channel occupancy duration Duration indicated by information, more than or equal to the downlink data that the access device issues second terminal equipment to second terminal equipment Channel occupancy duration is part or all of needed for frame；The access device is in the duration scope indicated by channel occupancy duration information It is interior, send the downlink data frame of second terminal equipment.

Be may include referring to Fig. 9, a kind of downlink data transmission method provided in an embodiment of the present invention：

901st, access device sends the downlink data frame of first terminal equipment；

Wherein, the downlink data frame of first terminal equipment carries channel occupancy duration information, the channel occupancy duration information Indicated duration, more than or equal to the downlink data frame institute that the access device issues second terminal equipment to second terminal equipment Need the part or all of of channel occupancy duration；It is appreciated that the downlink data frame of the first terminal equipment of access device transmission is also The downlink data that first terminal equipment is not downloaded is carried, is also possible to carry other existing informations certainly.Downlink data frame example Such as can be last downlink data frame for the first terminal equipment that access device is currently needed for transmission, for example, first end The downlink data frame of end equipment include indicate the first terminal equipment downlink data frame be the first terminal last under The configured information of row data frame, such as last downlink data frame are by More Data (more data) position in the frame Last downlink data frame is indicated that it is for 0), and work as More Data for 0, that is, represent be last downlink data frame and Channel occupancy duration is more than 00, to represent and issue data time for preengage next terminal device.It is of course also possible to be to connect Enter first or other any one downlink data frames that equipment is currently needed for the first terminal equipment of transmission, for example, under passing through More Data last for indicating the downlink data frame not to be issued to first terminal equipment for 1 in row data frame Downlink data frame.

In one embodiment of the invention, the downlink data frame of first terminal equipment carries channel occupancy duration information example The duration fields of the downlink data frame of first terminal equipment are such as carried in, other fields are also carried in certainly.

In one embodiment of the invention, before the downlink data frame that access device issues first terminal equipment can first to Under be sent to the downlink data frame of first terminal equipment.

902nd, access device is sent under second terminal equipment in the range of the duration indicated by channel occupancy duration information Row data frame.

In one embodiment of the invention, the downlink data frame of first terminal equipment carries channel occupancy duration information institute The corresponding initial time of duration of instruction, can be specified time (such as certain absolute time or certain relative time) or access device hair Sent first terminal equipment downlink data frame (last downlink data frame of such as first terminal equipment or any one under Row data frame) time, or access device receives the downlink data frame of first terminal equipment (for example first terminal equipment is most Latter downlink data frame or any one downlink data frame) corresponding acknowledgement frame time；The channel occupancy duration information institute The duration corresponding end time of instruction, can be to change the downlink data frame (such as that access device has sent second terminal equipment Last downlink data frame or any one downlink data frame of two terminal devices) time, or access device receives Downlink data frame (last downlink data frame or any one downlink data of such as second terminal equipment of two terminal devices Frame) corresponding acknowledgement frame time.

In one embodiment of the invention, access device might be used also before the downlink data frame of first terminal equipment is sent Broadcast frame is issued, the broadcast frame is carried and can transmit indicating bit table TIM, the transmission indicating bit table indicates to have not downloading downlink data Terminal device includes first terminal equipment and second terminal equipment.Certainly, access device can also otherwise indicate first Terminal device and second terminal equipment have the downlink data do not downloaded, or first terminal equipment and second terminal equipment can be always Keep waking up state or state of waking up is always maintained at after broadcast frame is received, wait access device to be received to issue downlink data.

If additionally, the transmission indicating bit table that access device issues broadcast frame carrying indicates to have the terminal for not downloading downlink data Equipment also includes third terminal equipment；Then access device issues the downlink data frame of second terminal equipment and can also carry the second letter Road takes duration information, and the second channel takes the duration indicated by duration information, more than or equal to the access device to the 3rd Terminal device issues the part or all of of channel occupancy duration needed for the downlink data frame of third terminal equipment；Access device is issued After the downlink data frame of second terminal equipment, can also be taken in the range of duration indicated by duration information in second channel, issued The downlink data frame of third terminal equipment, wherein, under the downlink data frame of third terminal equipment carries third terminal equipment not The downlink data of load.It is appreciated that.When having the terminal device for not downloading downlink data in the presence of multiple, AP can be according to Aforesaid way issues downlink data to different terminal equipment successively, and issues the latter time of the downlink data of terminal device, In the range of duration indicated by the channel occupancy duration information of the downlink data frame carrying for starting from previous terminal device, so may be used To avoid the competition between each terminal device from transmitting.Wherein, channel occupancy duration information is carried in downlink data frame Duration fields, are also carried in other fields of downlink data frame certainly.

For ease of being better understood from, below by being illustrated as a example by a concrete application scene.

It is assumed that the TIM that the broadcast frame that terminal device (such as STA) is issued according to AP is carried, knows that oneself is not downloaded down Row data, then, STA keeps the state for waking within the ensuing competition phase, waits AP to send downlink data.And in this phase Between, STA does not send PS_Poll message and carrys out requirement acquisition downlink data to AP.The channel use time of WiFi is typically divided into competing Strive phase and non-competing phase.STA can know when competition phase and non-competing phase start by monitoring Beacon frames, when terminate. And have the STA of non-downloading data in the competition phase, wait AP to send downlink data to it.

For example shown in Figure 10, it is assumed that there are three terminal devices not download downlink data.AP can be to the 1st terminal device (such as STA1) sends request and sends (RTS, Request To Send) frame, and request sends downlink data, in the RTS frames Duration fields may indicate that and issue occupancy duration of the downlink data frame of STA1 to channel by AP (such as AP starts to be issued to STA1 Duration of downlink data frame when AP receives the ACK of STA1 feedbacks).Channel occupancy duration is network allocation vector (NAV, Network Allocation Vector) wherein, AP has various methods to select which STA as being given under the 1st The STA of row data, such as AP, such as can be since AID minimum STA, according to ascending according to the algorithm of oneself decision Order transmission etc. successively.

After STA1 receives the RTS frames of AP transmissions, can be returned to AP allows to send (CTS, Clear To Send) frame, should CTS frames indicate to allow AP to send data, and the duration fields in the CTS frames equally may indicate that the downlink data frame for issuing STA1 To the occupancy duration of channel (such as AP start to STA1 issue downlink data frame to AP receive the ACK of STA1 feedbacks when it is required Duration) untill.

AP sends downlink data frame (such as DL data1) to STA1, wherein, the downlink data frame may also function as one simultaneously The effect of RTS frames, the duration fields of the downlink data frame may indicate that AP issues the downlink data frame of STA2 and channel is accounted for With duration (such as AP start to STA2 issue downlink data frame to AP receive the ACK that STA2 feeds back when required duration), with Ensure that down channel can be occupied.

Afterwards, AP sends downlink data frame (DL data2) to STA2, and the duration fields of the downlink data frame can refer to Show and issue the downlink data frame of STA3 by AP (such as AP starts to issue downlink data frame to STA3 and connect to AP to the occupancy duration of channel Receive duration required during the ACK of STA3 feedbacks).Based on this kind of mode, until AP sends last to last 1 STA (STAn) During one downlink data frame, the duration fields that the downlink data frame (DL datan) is carried can only indicate the channel will be by Take AP and receive corresponding ACKn and terminate, no longer busy channel behind expression, because hereafter there is no downlink data frame Issue.

Therefore, the present embodiment access device sends the downlink data frame of first terminal equipment；Wherein, first terminal sets Standby downlink data frame carries channel occupancy duration information, and the duration indicated by the channel occupancy duration information is more than or equal to Access device issues the part of channel occupancy duration needed for the downlink data frame of second terminal equipment or complete to second terminal equipment Portion；Access device sends the downlink data frame of second terminal equipment in the range of the duration indicated by channel occupancy duration information. Because access device indicates it to issue downlink data to next terminal device using the downlink data frame issued to terminal device Required channel occupancy duration it is part or all of, to shift to an earlier date reserve channel resource so that letter of other terminal devices in the reservation Road takes will not initiate competition in duration, access device starts to issue the descending of next terminal device in the channel occupancy duration Data frame, such access device smoothly can issue downlink data frame to each terminal device successively, not result in each terminal device Between transmission competition, so advantageously reduce terminal device energy consumption, be conducive to preferably being applied to and there is more multi-terminal equipment Communication scenes.

A kind of access device 1100 is also provided referring to Figure 11-a, the embodiment of the present invention, it may include：

3rd transmitter 1101, the downlink data frame for sending first terminal equipment；

Wherein, the downlink data frame of first terminal equipment carries channel occupancy duration information, the channel occupancy duration information Indicated duration, more than or equal to the downlink data frame that access device 1100 issues second terminal equipment to second terminal equipment Required channel occupancy duration it is part or all of；

It is appreciated that the downlink data frame of the first terminal equipment of the transmission of the 3rd transmitter 1101 also carries first terminal The downlink data that equipment is not downloaded, is also possible to carry other existing informations certainly.The downlink data frame for example can be to access to set Last downlink data frame of the standby first terminal equipment for being currently needed for sending, for example, the lower line number of the first terminal equipment According to frame include indicate the first terminal equipment downlink data frame be the first terminal last downlink data frame instruction Information.Certainly be also likely to be access device be currently needed for sending first of first terminal equipment or other any one it is descending Data frame.

3rd transmitter 1101 is additionally operable in the range of duration indicated by above-mentioned channel occupancy duration information, sends second eventually The downlink data frame of end equipment.

Referring to Figure 11-b, in one embodiment of the invention, access device 1100 may also include：

4th transmitter 1102, for the front lower of the downlink data frame in the transmission first terminal equipment of the 3rd transmitter 1101 Hair broadcast frame, the broadcast frame carries transmission indicating bit table, and the transmission indicating bit table indicates have the terminal for not downloading downlink data to set It is standby to include first terminal equipment and second terminal equipment.

Referring to Figure 11-c, in one embodiment of the invention, access device 1100 may also include：

5th transmitter 1103, for the 3rd transmitter 1101 send first terminal equipment downlink data frame before, RTS frames are sent to first terminal equipment；

Second receiver 1104, the CTS frames for receiving the transmission of first terminal equipment.

In one embodiment of the invention, the downlink data frame of first terminal equipment carries channel occupancy duration information institute The corresponding initial time of duration of instruction, can be specified time (such as certain absolute time or certain relative time) or access device hair Sent first terminal equipment downlink data frame (last downlink data frame of such as first terminal equipment or any one under Row data frame) time, or access device receives the downlink data frame of first terminal equipment (for example first terminal equipment is most Latter downlink data frame or any one downlink data frame) corresponding acknowledgement frame time；The channel occupancy duration information institute The duration corresponding end time of instruction, can be to change the downlink data frame (such as that access device has sent second terminal equipment Last downlink data frame or any one downlink data frame of two terminal devices) time, or access device receives Downlink data frame (last downlink data frame or any one downlink data of such as second terminal equipment of two terminal devices Frame) corresponding acknowledgement frame time, by that analogy.

It is understood that access device 1100 in the present embodiment can be in such as above-mentioned embodiment of the method AP access and set Standby, the function of its each functional module can be implemented according to the method in above method embodiment, and it implements process The associated description of above method embodiment is referred to, here is omitted.

The embodiment of the present invention provides a kind of communication system, it may include access device 700 or 1100.

Referring to Figure 12, the embodiment of the present invention also provides a kind of communication system, it may include：

Access device 1210, and the equipment of the core network 1220 being communicably connected with access device 1210.

Wherein, access device 1210 can be such as the access device 700 or 1100 described in above-mentioned embodiment, equipment of the core network 1220 for example can be mobile management network element or other equipments of the core network.

In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion described in detail in certain embodiment Point, reference can be made to the associated description of other embodiments.

It should be noted that for foregoing each method embodiment, in order to be briefly described, therefore it is all expressed as a series of Combination of actions, but those skilled in the art should know, the present invention not by described by sequence of movement limited because According to the present invention, some steps can sequentially or simultaneously be carried out using other.Secondly, those skilled in the art should also know Know, embodiment described in this description belongs to preferred embodiment, involved action and module is not necessarily of the invention It is necessary.

To sum up, in a kind of scheme of the embodiment of the present invention, when the broadcast frame that access device is issued carries at least one service Between information, the service time information be used for indicate that the access device issues the service time of downlink data；If terminal device has The downlink data do not downloaded, then access device notify that terminal device has a downlink data do not downloaded, and at least one service In the service time indicated by wherein one or more service time information in temporal information, issued to the terminal device descending Data.At least one service window is opened because access device aims at it and issues downlink data, if under certain terminal device has not The downlink data of load, what access device can be opened up at it is exclusively used in issuing one or more service window of downlink data It is interior, downlink data is issued to the terminal device, so it is advantageous for avoiding the terminal device of reporting uplink data and obtains descending Competition transmission problem between the terminal device of data, advantageously reduces terminal device energy consumption.

Further, it is assumed that after access device receives the upstream data that terminal device is reported, sent to the terminal device The reception response of the upstream data, wherein, the reception is responded for notifying whether the terminal device has the downlink data do not downloaded, Abandon using TIM to notify whether terminal device has the current mechanism of the downlink data do not downloaded due to the program, and utilized The reception of the upstream data that terminal device is reported responds targetedly to notify whether the terminal device has existing downlink data, keeps away Exempt to use existing TIM, and then be conducive to controlling the size of Beacon frames；Also, because access device is set using each terminal The reception of the standby upstream data for reporting responds to notify whether the terminal device has the downlink data do not downloaded, such downlink data The specific aim of notice is stronger, is conducive to the flexibility of the informing mechanism of raising downlink data, and then is conducive to preferably applicable depositing In the communication scenes of more multi-terminal equipment, also, realized notifying by then passing through to the extension for receiving response, and then can New message is introduced, cost of implementation is relatively low.

One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can Completed with instructing the hardware of correlation by program, the program can be stored in a computer-readable recording medium, storage Medium can include：Read-only storage, random access memory, disk or CD etc..

The downlink data transmission method and relevant device and communication system for being provided the embodiment of the present invention above are carried out It is discussed in detail, specific case used herein is set forth to principle of the invention and implementation method, above example Illustrate that being only intended to help understands the method for the present invention and its core concept；Simultaneously for those of ordinary skill in the art, according to According to thought of the invention, will change in specific embodiments and applications, to sum up, this specification content should not It is interpreted as limitation of the present invention.

Claims

1. a kind of downlink data transmission method, it is characterised in that including：

Terminal device receives broadcast frame；

Wherein, the broadcast frame carries at least one service time information, and the service time information is used to indicate that access sets The standby service time for being exclusively used in issuing downlink data；

If the terminal device determines to have the downlink data do not downloaded, at least one service time information wherein In service time indicated by one or more service time information, downlink data is obtained from the access device；

Wherein, different terminal devices issues the different service times of downlink data come line number under obtaining in the access device According to, or, the access device at most allows N number of terminal device descending to obtain in each service time for issuing downlink data Data.

2. method according to claim 1, it is characterised in that

The broadcast frame also carries transmission indicating bit table；

The determination has the downlink data do not downloaded, including：Determine that the terminal device has according to the transmission indicating bit table The downlink data do not downloaded；

Or,

Methods described also includes：To the access device reporting uplink data, the terminal device is received and the terminal device From the reception response of the upstream data of the access device；The determination has the downlink data do not downloaded, including：According to connecing The reception for receiving has the downlink data do not downloaded in response to determining that going out the terminal device.

3. method according to claim 2, it is characterised in that

The terminal device includes to access device reporting uplink data：The terminal device is periodically reported to access device Upstream data.

4. method according to claim 1, it is characterised in that

The broadcast frame is broadcast beacon frame.

5. the method according to any one of Claims 1-4, it is characterised in that

If the service time information is used to indicate that the access device issues service start time and the service of downlink data Duration, then clothes indicated by described wherein one or more service time information at least one service time information In the business time, downlink data is obtained from the access device, including：In at least one service time information wherein one In the range of the service duration after service start time indicated by individual service time information, lower line number is obtained from the access device According to；

Or,

If the service time information is used to indicate that the access device issues service ending time and the service of downlink data Duration, then clothes indicated by described wherein one or more service time information at least one service time information In the business time, downlink data is obtained from the access device, including：In at least one service time information wherein one In the range of the service duration before service ending time indicated by individual service time information, obtain descending from the access device Data；

Or,

If the service time information is used to indicate that the access device issues the service start time of downlink data, described In the service time indicated by wherein one or more service time information at least one service time information, from The access device obtains downlink data, including：One of them service time at least one service time information In the range of setting service duration after service start time indicated by information, downlink data is obtained from the access device；

Or,

If the service time information is used for the service start time for indicating the access device to issue downlink data and service is tied The beam time, then indicated by described wherein one or more service time information at least one service time information In service time, downlink data is obtained from the access device, including：In at least one service time information wherein After service start time indicated by one service time information, and in the clothes indicated by one of them the service time information Before the business end time, downlink data is obtained from the access device；

Or,

If the service time information is used to indicate that the access device issues the service ending time of downlink data, described In the service time indicated by wherein one or more service time information at least one service time information, from The access device obtains downlink data, including：One of them service time at least one service time information In the range of setting service duration before service ending time indicated by information, downlink data is obtained from the access device；

Or,

If the service time information is used to indicate the access device to issue the service duration of downlink data, described described In the service time indicated by wherein one or more service time information at least one service time information, connect from described Enter equipment and obtain downlink data, including：After the service start time that the access device of setting issues downlink data, and in institute State in the range of the service duration indicated by one of them the service time information at least one service time information, connect from described Enter equipment and obtain downlink data.

6. method according to claim 5, it is characterised in that

When service indicated by described one of them service time information at least one service time information is initial Between after service duration in the range of, from the access device obtain downlink data, including：Generation is random to make a concession duration, described The service start time indicated by one of them service time information at least one service time information is plus described random Make a concession after duration, downlink data is obtained from the access device, wherein, the random yielding duration is less than one of clothes The access device indicated by business temporal information issues the service duration of downlink data；

Or,

When service indicated by described one of them service time information at least one service time information is initial Between after setting service duration in the range of, from the access device obtain downlink data, including：Generation is random to make a concession duration, The service start time indicated by one of them service time information at least one service time information adds institute State after random yielding duration, downlink data is obtained from the access device, wherein, the random duration of making a concession is less than setting The access device issues the service duration of downlink data；

Or,

After the service start time for issuing downlink data in the access device of setting, and when described at least one services Between in the range of service duration indicated by one of them service time information in information, obtain lower line number from the access device According to, including：Generation is random to make a concession duration, the access device of setting issue the service start time of downlink data plus it is described with Machine is made a concession after duration, and downlink data is obtained from the access device, wherein, the random yielding duration is less than this one of them Service duration indicated by service time information；

Or,

When service indicated by described one of them service time information at least one service time information is initial Between after, and before the service ending time indicated by one of them the service time information, obtained from the access device Downlink data, including：Generation is random to make a concession duration, one of them service time at least one service time information Service start time indicated by information is added after the random yielding duration, and downlink data is obtained from the access device, Wherein, the service start time indicated by one of them the service time information adds the random yielding duration, less than this its In service ending time indicated by a service time information.

7. method according to claim 5, it is characterised in that

It is described to obtain downlink data from the access device, including：

Receive the downlink data that the access device is issued；Or,

Energy-conservation query messages are sent to the access device, the reception access device is after the energy-conservation query messages are received The downlink data for issuing.

8. a kind of downlink data transmission method, it is characterised in that including：

Access device issues broadcast frame；

Wherein, the broadcast frame carries at least one service time information, and the service time information is used to indicate described connecing Enter device-specific in the service time for issuing downlink data；

If terminal device has the downlink data do not downloaded, access device notifies that the terminal device has the lower line number do not downloaded According to the service time indicated by wherein one or more service time information at least one service time information It is interior, issue downlink data to the terminal device；

9. method according to claim 8, it is characterised in that

It is described to notify that the terminal device has the downlink data do not downloaded, including：Using transmission of the carrying in the broadcast frame Indicating bit table, notifies that the terminal device has the downlink data do not downloaded；

Or,

Methods described also includes：Receive the upstream data that the terminal device is reported；

It is described to notify that the terminal device has the downlink data do not downloaded, including：The upper line number is sent to the terminal device According to reception respond, wherein, it is described to receive response for notifying whether the terminal device has the downlink data do not downloaded.

10. method according to claim 8 or claim 9, it is characterised in that

When the service time information is used to indicate that the access device issues service start time and the service of downlink data It is long, or, the service time information is used to indicate that the access device issues the service ending time kimonos of downlink data Business duration, or, the service time information is used to indicate that the access device issues the service start time of downlink data And/or service ending time, or, when the service time information indicates the access device to issue the service of downlink data It is long.

11. method according to claim 8 or claim 9, it is characterised in that

The access device indicated by each service time information at least one service time information issues descending The service time of data, downlink data is issued to one or more different terminal devices for the access device.

A kind of 12. terminal devices, it is characterised in that including：

Receiver, for receiving broadcast frame；

Acquiring unit, for if it is determined that the terminal device has the downlink data do not downloaded, when described at least one services Between in service time indicated by wherein one or more service time information in information, obtain descending from the access device Data；

13. terminal devices according to claim 12, it is characterised in that

The broadcast frame also carries transmission indicating bit table,

The acquiring unit includes：

First determination sub-module, for determining whether the terminal device has do not download descending according to the transmission indicating bit table Data；

First acquisition submodule, if determining that the terminal device has the lower line number do not downloaded for first determination sub-module According to the service time indicated by wherein one or more service time information at least one service time information It is interior, obtain downlink data from the access device；

Or,

The terminal device also includes：

Transmitter, for the access device reporting uplink data；

The receiver is additionally operable to, and receives the reception response of the upstream data from the access device；

The acquiring unit includes：

Second determination sub-module, for according to the reception that receives in response to determining that whether the terminal device has what is do not downloaded Downlink data；

Second acquisition submodule, if determining that the terminal device has the lower line number do not downloaded for second determination sub-module According to the service time indicated by wherein one or more service time information at least one service time information It is interior, obtain downlink data from the access device.

14. terminal device according to claim 12 or 13, it is characterised in that

The acquiring unit is specifically for if the service time information is used to indicate that the access device issues downlink data Service start time and service duration, and determine that the terminal device has the downlink data do not downloaded, then it is described at least The service duration scope after the service start time indicated by one of them service time information in one service time information It is interior, obtain downlink data from the access device；

Or,

The acquiring unit is specifically for if the service time information is used to indicate that the access device issues downlink data Service ending time and service duration, and determine that the terminal device has the downlink data do not downloaded, then it is described at least The service duration model before the service ending time indicated by one of them service time information in one service time information In enclosing, downlink data is obtained from the access device；

Or,

The acquiring unit is specifically for if the service time information is used to indicate that the access device issues downlink data Service start time, and determine that the terminal device has the downlink data do not downloaded, then when described at least one services Between in the range of setting service duration after service start time indicated by one of them service time information in information, from The access device obtains downlink data；

Or,

The acquiring unit is specifically for if the service time information is used to indicate the access device to issue downlink data Service start time and service ending time, and determine that the terminal device has the downlink data do not downloaded, then it is described extremely After the service start time indicated by one of them service time information in few service time information, and at this wherein Before service ending time indicated by one service time information, downlink data is obtained from the access device；

Or,

The acquiring unit is specifically for if the service time information is used to indicate that the access device issues downlink data Service ending time, and determine that the terminal device has the downlink data do not downloaded, then when described at least one services Between in the range of setting service duration before service ending time indicated by one of them service time information in information, from The access device obtains downlink data；

Or,

The acquiring unit is specifically for if the service time information is used to indicate the access device to issue downlink data Service duration, and determine that the terminal device has the downlink data do not downloaded, then the access device in setting issues lower line number According to service start time after, and one of them service time information at least one service time information is signified In the range of the service duration for showing, downlink data is obtained from the access device.

A kind of 15. access devices, it is characterised in that including：

Second transmitter, for issuing broadcast frame；

Data distributing module, if there is the downlink data do not downloaded for terminal device, notifies that the terminal device is not downloaded Downlink data；The clothes indicated by wherein one or more service time information at least one service time information In the business time, downlink data is issued to the terminal device；

16. access devices according to claim 15, it is characterised in that

The data distributing module is specifically for if terminal device has the downlink data do not downloaded, using carrying described wide The transmission indicating bit table broadcast in frame notifies that the terminal device has the downlink data do not downloaded；In at least one service time In the service time indicated by wherein one or more service time information in information, lower line number is issued to the terminal device According to；

Or,

Access device also includes receiver, for receiving the upstream data that the terminal device is reported；

The data distributing module to the terminal device specifically for if terminal device has the downlink data do not downloaded, sending out The reception of the upstream data is sent to respond, wherein, it is described to receive response for notifying whether the terminal device has what is do not downloaded Downlink data；The service indicated by wherein one or more service time information at least one service time information In time, downlink data is issued to the terminal device.

17. access device according to claim 15 or 16, it is characterised in that

A kind of 18. communication systems, it is characterised in that including：

Access device as described in claim 15,16 or 17, and the core being communicably connected with the access device Heart net equipment.