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Data transmission method and data transmission device

A data transmission method and data technology, applied in the direction of digital transmission system, transmission system, electrical components, etc., can solve the problem of not being able to track the channel well, and achieve the effect of good channel condition

Active Publication Date: 2013-06-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the 802.11ah protocol needs to support outdoor low-speed mobile application scenarios. In this scenario, the channel time domain changes faster than before, so the current frame structure will not be able to track channel changes well.

Method used

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  • Data transmission method and data transmission device
  • Data transmission method and data transmission device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Figure 3A and Figure 3B It is a schematic diagram of a frame structure of a PPDU according to an embodiment of the present invention. In this embodiment, the time domain position of the first long training domain is always fixed, but in the prior art, under different bandwidths, the frame structure may be different, and at this time the time domain position of the first long training domain may be Varies with bandwidth. In the case of fixed bandwidth, the assumption that the temporal location of the first long training domain is always fixed still applies. Whether the time domain position of the first long training domain is fixed is not the key point of the present invention, but only to ensure logical flow, because if the time domain position of the first long training domain is variable, additional signaling is required to indicate the time domain of the first long training domain Location.

[0061] Figure 3A and Figure 3B In the embodiment of the present i...

Embodiment 2

[0076] Figure 4 It is a schematic diagram of a frame structure of a PPDU according to another embodiment of the present invention.

[0077] Such as Figure 4 As shown, the difference from Embodiment 1 is that the time domain position of the first long training field is fixed, while the time domain positions of the second long training field to the Mth long training field in the PPDU are variable. For example, the time interval T of the first and second long training domains may be different for each frame, and there may be several alternative values, such as {T1, T2, T3, T4}. In this way, an optimal T value can be determined for the current moving speed of the target receiver in each frame. The variable time interval T is more flexible, but at the same time requires additional overhead. For example, if there are four T value options, correspondingly, 2 bits need to be added in the control signaling to indicate which time interval the frame adopts.

[0078] For example, B0...

Embodiment 3

[0087] Figure 5 is a schematic diagram of the process of notifying location information in an embodiment of the present invention. Figure 5 In this embodiment, the access point AP notifies the stations STA1 and STA2 of the location information of the long training domain through a broadcast frame (such as the variable time interval T in the second embodiment above).

[0088] The difference between the third embodiment and the second embodiment is that the time interval between the two long training domains is notified by a broadcast frame (such as a beacon frame, Beacon), until the arrival of the next beacon frame, the current latest time interval is allow.

[0089] First, the AP sets the LTF time interval in the beacon frame, specifically adding a new information element (IE, information element) in the existing beacon frame to indicate the LTF time interval.

[0090] For example, an LTF interval (LTF interval) information element may be added in the frame body of the exi...

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Abstract

An embodiment of the invention provides a data transmission method and a data transmission device. The method includes: a presentation protocol data unit (PPDU) is generated, the PPDU comprises N groups of long training domains, N is a positive integer and is determined by space-time flow number adopted by the PPDU, each group of long training domains comprise M long training domains, M is a positive integer and is variable to different PPDUs, and the PPDU is sent to a receiving end. Number of the long training domains in each group of long training domains can change according to PPDU situation, and channel condition can be reflected well so as to be adapted to a data low-speed transmission scene.

Description

technical field [0001] The embodiments of the present invention relate to the field of wireless communication, and more specifically, to a data transmission method and a data transmission device. Background technique [0002] A basic service set (Basic Service Set, BSS) is a basic component of a wireless local area network (Wireless local area net, WLAN). Stations (STAs, Stations) within a certain coverage area and having certain associations form a BSS. The most basic form of association is that stations communicate directly with each other in an ad hoc network, which is called an independent basic service set (Independent BSS, IBSS). [0003] A more common situation is that the STA is associated with a central site called an access point (Access point, AP) dedicated to managing the BSS. A BSS built around an AP is called a BSS with infrastructure. BSSs with infrastructure can be connected to each other by their APs through a distributed system (Distributed System, DS) t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L25/02H04L27/26
Inventor 高磊陈庆勇陈小锋王学寰
Owner HUAWEI TECH CO LTD
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