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Data transmission method and device

A data transmission method and equipment technology, applied in the field of communication, can solve the problems of limited system capacity, low system spectrum utilization, waste of resources, etc.

Active Publication Date: 2017-04-05
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for selecting time-frequency resources, which are used to solve the existing distributed algorithm based on time-slot reservation. Due to the use of time-division multiplexing to occupy time-frequency resources, the existing system spectrum utilization rate is low. , resource waste, and limited system capacity

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Embodiment 1

[0141] Embodiment 1: This embodiment selects the occupied time-frequency resource based on the received FI message, taking a partial frequency division method as an example.

[0142] It is assumed that each node retransmits once, that is, the transmission of each node includes an initial transmission and a retransmission. The initial / retransmission time-frequency resource pairs pre-configured by the system are shown in Table 1. X1 represents an initial / retransmission time-frequency resource pair, and X2 represents an initial / retransmission time-frequency resource pair.

[0143] Table 1

[0144] time slot 1 time slot 2 slot 3 slot 4 slot 5 Subband 1 Node A Node A X1 X1 X sub-band 2 Node B X2 Node B X2 X Subband 3 X X X X X

[0145] In the table, X represents an idle time-frequency resource, and there are two initial / retransmission time-frequency resource pairs X1 and X2 in the idle time-frequency resource, both of which...

Embodiment 2

[0155] Embodiment 2: This embodiment is used to illustrate the time-frequency resource maintenance process, taking the complete frequency division method as an example.

[0156] For the two nodes A and B that have been frequency-division multiplexed, the time-frequency resources occupied by them are shown in Table 2.

[0157] Table 2

[0158] time slot 1 time slot 2 slot 3 slot 4 slot 5 Subband 1 Node A Node A Node D Node D X sub-band 2 Node B Node B X X X Subband 3 X X X X X

[0159] In the table, X represents idle time-frequency resources. Since node A and node B occupy the same time slot by frequency division multiplexing, it means that node A and node B have no communication requirements with each other.

[0160] Whether node A and node B can continue frequency division multiplexing is determined by a third party (namely node D), as follows:

[0161] For node A, it is assumed that node D determines the received ...

Embodiment 3

[0165] Embodiment 3: This embodiment provides a scenario where retransmission is not considered when the number of subbands is relatively small.

[0166] The frequency division multiplexing between nodes is shown in Table 3. Node A and node B use frequency division multiplexing to occupy time slot 1, and node C and node D use frequency division multiplexing to occupy time slot 2. X in the table represents idle time audio resources.

[0167] table 3

[0168] time slot 1 time slot 2 slot 3 slot 4 slot 5 Subband 1 Node A Node C X X X sub-band 2 Node B Node D X X X

[0169] When node E selects time-frequency resources, it selects time slots occupied by nodes far away from itself for frequency division multiplexing. The principle of selecting time slots for frequency division multiplexing is consistent with the consideration of the retransmission mode, that is, it is determined according to the FI message or received power. The jud...

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Abstract

The invention discloses a data transmission method and device, and the method and device are used for solving a problem that the system spectrum utilization rate of a conventional distribution algorithm based on time slot reservation is low because the conventional distribution algorithm employs a mode of time division multiplexing. The method comprises the steps that a first node selects a first time frequency resource occupied by the first node from time frequency resources, corresponding to a condition that the first node is a spare sub-band, from a time slot which can achieve frequency division multiplexing, and carries out the data transmission on the first time frequency resource, wherein at least one time frequency resource, except the time frequency resource occupied by the first node, on the time slot which can achieve frequency division multiplexing serves as a second time frequency resource occupied by the second node, and the spatial isolation degree between the first node and the second node is less than the minimum spatial isolation degree that the nodes capable of reusing the same time frequency resource need to meet, and is greater than the maximum distance that nodes with the communication demands need to meet, thereby achieving the frequency division multiplexing of the time slot between at least two nodes without communication demands.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a data transmission method and equipment. Background technique [0002] The services in the Internet of Vehicles system can be divided into three categories: road safety, traffic efficiency, and infotainment. Among them, the road safety business is the most important and typical business in the Internet of Vehicles system. The basic requirement of this type of business is: each vehicle node needs to reliably receive the safety information sent by other vehicle nodes within the X meter range, and the distance here is related to specific applications and scenarios. [0003] The road safety services of the Internet of Vehicles system mostly use self-organizing networks, and there are two main types of time slot resource allocation mechanisms: one is based on the Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA) mechanism improved; another type is base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/12H04W16/18H04W72/04
CPCH04W16/12H04W16/18H04W72/0446
Inventor 冯媛周海军李媛媛房家奕赵丽林琳
Owner DATANG MOBILE COMM EQUIP CO LTD
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