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A data transmission method and device

A data transmission method and data technology, applied in short-distance communication services, wireless communication, electrical components, etc., can solve problems such as resource collisions, difficulties in meeting V2X communication requirements, and road safety hazards

Active Publication Date: 2019-08-16
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the existing technology is that it is difficult to meet the V2X communication requirements in the case of high node density in the Internet of Vehicles due to the problem of low resource utilization in the CSMA mechanism and LTE-D2D
Especially when the above two resource allocation mechanisms are applied to the vehicle self-organizing system, if the network load increases, serious resource collisions will occur, causing road safety hazards

Method used

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  • A data transmission method and device
  • A data transmission method and device
  • A data transmission method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] Image 6 It is a schematic diagram of sending resources in a resource allocation period in Embodiment 1. As shown in the figure, in this example, set the system bandwidth to 10MHz, X equals 20ms, Y equals 4ms, and 16ms as the data transmission time. Each basic data The unit duration is 1ms. For the convenience of description, the basic data unit is called a data subframe, and the data sending process can be as follows:

[0193] A resource allocation cycle is 20ms, the contention resolution time is 4ms (corresponding to the length of 4 LTE system subframes), and 16 data subframes (each data subframe is 1ms).

[0194] Since each subframe in the LTE system contains 14 OFDM symbols, or SC-FDMA (Single-carrier Frequency-Division Multiple Access) symbols, it is assumed that each contention resolution signal occupies 0.5 OFDM symbols (or SC-FDMA). FDMA symbol), the 4ms contention resolution time includes 112 contention resolution signal transmission time domain positions.

[0195] W...

Embodiment 2

[0201] Picture 8 It is a schematic diagram of sending resources in a resource allocation period in Embodiment 2. As shown in the figure, in this example, set the system bandwidth to 10MHz, X equals 25ms, Y equals 5ms, and 20ms as the data transmission time. Each basic data The unit duration is 0.5ms. For the convenience of description, the basic data unit is called data subframe. In specific implementation, to distinguish from the 1ms subframe length in the LTE system, other names can also be used, such as data time slot, then data The sending process can be as follows:

[0202] A resource allocation cycle is 25ms, contention resolution time is 5ms (corresponding to the length of 5 LTE system subframes), and 40 data subframes (each data subframe is 0.5ms).

[0203] Since each subframe in the LTE system contains 14 OFDM symbols (or SC-FDMA symbols), assuming that each contention resolution signal occupies 0.5 OFDM symbols (or SC-FDMA symbols), the contention resolution time of 5 ms...

example 2

[0206] It should be noted that the number of groups divided by the basic data unit (Q equals 2) given in this embodiment is actually the same as the number of groups divided by the contention resolution signal transmission time domain position (using T k mode Q, when Q is equal to 2, it is actually equivalent to dividing the contention resolution signal transmission time domain position into two groups) is the same. In actual implementation, the number of groups divided by the basic data unit and the number of groups divided by the contention resolution signal transmission time domain position (regardless of whether the basic data unit and the contention resolution signal transmission time domain position are explicitly grouped (in this embodiment, the basic Whether the data unit adopts explicit grouping) or implicit grouping (for example, the contention resolution signal transmission time domain position in this embodiment adopts an implicit grouping method)) can be divided int...

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Abstract

The invention discloses a data transmitting method and device. The data transmitting method comprises the steps that resource allocation cycles required for transmitting data are determined, wherein each resource allocation cycle includes a competition solving time period formed by transmitting time domain positions and a data transmitting time period formed by basic data units, and each competition solving signal is corresponding to one basic data unit; the basic data units reserved and expected to be used by the competition solving signal are transmitted at the selected transmitting time domain position or the basic data units and the transmitting time domain positions are grouped, and the reserved basic data units are the basic data units in a basic data unit group corresponding to a transmitting time domain position group to which the selected transmitting time domain position belongs; the competition solving signal indicates the basic data units used by nodes in data transmission; and the data are transmitted on the reserved basic data units. With application of the data transmitting method and device, the resource collision probability can be reduced, the resource utilization efficiency can be enhanced and the communication requirements of a vehicle-mounted ad hoc network can be better met.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a data transmission method and device. Background technique [0002] Studies have shown that 80% of road traffic accidents are caused by the driver's negligence within 3 seconds before the accident. If the driver is alerted 0.5 seconds in advance, 60% of rear-end collisions can be avoided; if the driver can be alerted 1.5 seconds earlier and take measures, 90% of rear-end collisions can be avoided. These collision avoidance applications require extremely short transmission delays (typically 100 ms) for road safety-related information exchange between vehicles within a set range (such as 300 meters) or between vehicles and roadside infrastructure. Active safety early warning technology that uses V2X (Vehicle to Everything, information exchange between vehicles and the outside world) communication methods including vehicle-to-vehicle, vehicle-to-road, etc. t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04W4/80
CPCH04W74/0808H04W74/0816
Inventor 赵毅赵锐房家奕周海军赵丽
Owner DATANG MOBILE COMM EQUIP CO LTD