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Time slot distribution method and device

A time slot allocation and time slot technology, applied in the field of time slot allocation methods and devices, can solve the problems of low success rate of service reception, inability to guarantee multiple transmission of services, reduction of success rate of data reception, etc. The probability of gaps and the effect of improving the success rate of service reception

Active Publication Date: 2014-05-21
DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the pre-collision sensing service delay between vehicles requires a very short period of time, such as 20ms, and periodic broadcasts at a certain frequency within a certain effective time, such as 50Hz. If the existing MS-ALOHA priority preemption is used mechanism, it cannot guarantee that the service will be sent multiple times in one frame at a sending frequency of 50Hz
[0035] In addition, the pre-collision awareness service usually sends this message to two vehicles that are about to collide. According to the existing mechanism of MS-ALOHA, the probability of two vehicles selecting a time slot at the same time is relatively high, which leads to a higher success rate of data reception for this service. reduce
[0036] Therefore, the existing technology cannot meet the requirements of the vehicle to send low-latency, high-frequency messages when processing specified services (such as: pre-collision perception services), and the success rate of service reception is low

Method used

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  • Time slot distribution method and device

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Experimental program
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specific Embodiment 1

[0072] Specific embodiment 1: when the vehicle wants to send pre-collision sensing services, the number of time slots in the idle state and the time slots in the three-hop occupied state of each time slot selection window is higher than a certain threshold value, for example, the threshold value is 1.

[0073] As the specific parameters of the pre-collision awareness service are not defined in domestic standards, it is assumed that the service delay requirement is 12ms and the transmission frequency is 50Hz. In order to briefly explain the process, the parameters in this embodiment are reduced and enlarged with reference to the actual system. It is assumed that every N slots constitute a frame (Frame), where the value of N is 20, and the frame period is 20ms. The delay is 3ms, and the data packet frequency is 250Hz, such as image 3 As shown, the time slot occupancy of nodes 1 to 8 in the system is shown in the numbers in brackets. It can be seen that node 7 has occupied time ...

specific Embodiment 2

[0083] Embodiment 2: When the vehicle wants to send pre-collision sensing services, the number of time slots in idle state and three-hop occupied state of each time slot selection window is lower than a certain threshold value, for example, the threshold value is 2.

[0084] In order to briefly explain the process, the parameters in this embodiment are reduced and enlarged with reference to the actual system. It is assumed that every N slots constitute a frame (Frame), where the value of N is 20, and the frame period is 20ms. The delay is 3ms, and the data packet frequency is 250Hz, such as Image 6 As shown, the time slot occupancy of nodes 1 to 8 in the system is shown in the numbers in brackets. It can be seen that node 7 has occupied time slot 16, node 4 has occupied time slot 0, node 1 has occupied time slot 2, and so on. In addition, node 7 receives a pre-collision sensing service data packet with a delay of 3 ms and a transmission frequency of 250 Hz at time slot 1. Th...

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Abstract

The embodiment of the invention provides a time slot distribution method and device for sending business information with low time delay and high frequency when dealing with assigned business, and increasing the receiving success rate of the business. The method comprises: determining the receiving time and the type of the business of a specific data packet; when the type of the business is the type of the assigned business, determining the time interval of the receiving time of the data packet of the type of the business and sending the time delay requirements of the data packet of the type of the business; in accordance with the receiving time, the time interval and the time delay requirements, sending a data packet corresponding to the type of the business.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a time slot allocation method and device. Background technique [0002] MS-ALOHA (Mobile Slotted ALOHA, Mobile Slotted ALOHA Protocol) is an access and resource allocation mechanism based on TDMA (Time Division Multiple Access, Time Division Multiple Access). Each frame is composed of N time slots, and only one node can send on each time slot. When a node sends information on a time slot, the information carries FI (Frame Information, frame information), where FI consists of N fields Composition, each field corresponds to a time slot, reflecting the status of each time slot perceived by the sending node. Each node obtains the surrounding time slot usage by processing the FI information sent by other nodes, so as to realize the distributed time slot reservation effect. [0003] In MS-ALOHA, when a new node joins the network, it must first obtain time slot resources. The node...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04
Inventor 李凤冯媛房家奕赵毅赵丽
Owner DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD
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