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Data transmitting method and device

A data transmission method and data technology, applied in wireless communication services, electrical components, wireless communication, etc., can solve problems such as resource collision, low resource utilization, and difficulty in meeting V2X communication requirements

Active Publication Date: 2017-02-22
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] Figure 6 It is a schematic diagram of transmission resources in a resource allocation period in Embodiment 1. As shown in the figure, in this example, the system bandwidth is set to 10MHz, X is equal to 20ms, Y is equal to 4ms, and 16ms is used 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 period is 20ms, a 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, 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 contention resolution time of 4ms i...

Embodiment 2

[0201] Figure 8 It is a schematic diagram of transmission resources in a resource allocation cycle in Embodiment 2. As shown in the figure, in this example, the system bandwidth is set to 10MHz, X is equal to 25ms, Y is equal to 5ms, and 20ms is used 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 a data subframe. In specific implementation, in order to distinguish it from the subframe length of 1ms in the LTE system, other names can also be used, such as data slots, etc., and the data The sending process can be as follows:

[0202] A resource allocation period is 25ms, a 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 takes up 0.5 OFDM symbols (or S...

Embodiment 3

[0211] In this embodiment, the contention resolution signal uses time division + frequency division to indicate the basic data unit; the length of a contention resolution signal is 1 OFDM symbol; the time domain position of the contention resolution signal is grouped, and the node first selects the time when the contention resolution signal is sent Group; the node determines the resource it needs to reserve when it is sure that there will be no conflict; if the node finds that the resources in this group have been reserved, then reselect the sending time of the contention resolution symbol.

[0212] Figure 10 It is a schematic diagram of transmission resources in a resource allocation cycle in Embodiment 3. As shown in the figure, in this example, the system bandwidth is set to 10MHz, X is equal to 25ms, Y is equal to 5ms, and 20ms is used as the data transmission time. Each basic data unit The duration is 1ms, and the occupied frequency domain width is 5MHz, then the data se...

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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 technical field of wireless communication, in particular to a data sending 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 warned 0.5 seconds in advance, 60% of rear-end collisions can be avoided; if the driver can be warned 1.5 seconds earlier and take measures, 90% of rear-end collisions can be avoided. These collision avoidance applications require road safety-related information exchange between vehicles within a set range (such as 300 meters) or between vehicles and roadside infrastructure with extremely short transmission delays (typically 100ms). The active safety early warning technology that uses V2X (Vehicle to Everything, information exchange between vehicles and the outside world) communication methods including vehicle-vehicle and vehicle-road is a new way ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04W4/00
CPCH04W74/0808H04W74/0816
Inventor 赵毅赵锐房家奕周海军赵丽
Owner DATANG MOBILE COMM EQUIP CO LTD