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An Access Backoff Control Method Based on Device Priority in Narrowband Internet of Things

A narrow-band Internet of Things and control method technology, which is applied in the field of access backoff control based on device priority, can solve problems such as aggravated access conflicts and large access delays, so as to improve the success rate and reduce the total number of access losses and the effect of power consumption

Active Publication Date: 2020-05-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We can see that if the backoff time is set too long, it will cause a large access delay, and if the backoff time is too short, it will aggravate access conflicts and achieve half the result with twice the effort

Method used

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  • An Access Backoff Control Method Based on Device Priority in Narrowband Internet of Things
  • An Access Backoff Control Method Based on Device Priority in Narrowband Internet of Things
  • An Access Backoff Control Method Based on Device Priority in Narrowband Internet of Things

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Embodiment Construction

[0019] The present invention is described in further detail below in conjunction with accompanying drawing:

[0020] The device priority-based access backoff control method in the narrowband Internet of Things of the present invention comprises the following steps:

[0021] According to the back-off step, the priority of the device is divided into two types. When the device is connected to the NB-IoT, when multiple devices access the NB-IoT conflict, different back-off functions are selected according to the priority of the device. , and then connected to the narrowband Internet of Things, wherein the backoff function is:

[0022]

[0023] Among them, i is the number of backoffs, U is the minimum backoff interval, and c is the backoff factor.

[0024] Fitting c, c=a×i+b, compared with the exponential backoff scheme backoff_time=(2 i -1)×U, let|log y(i) (i+1)|+1=2 i -1, make c and y i The values ​​of a and b with the smallest mean square error are:

[0025]

[0026]...

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Abstract

The invention discloses a device-priority-based access backoff control method in the narrow-band IoT (Internet of Things), which comprises the following steps of: according to a backoff step length, dividing devices into high-priority devices and low-priority devices; and in the process that the devices access the narrow-band IoT, when a plurality of devices access the narrow-band IoT and a conflict occurs, according to priorities of the devices, selecting different backoff functions to carry out backoff, and then enabling the devices to access the narrow-band IoT. According to the method, a success rate of the devices in a network command reporting mode can be effectively improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to an access backoff control method based on device priority in narrowband Internet of Things. Background technique [0002] Narrow Band Internet of Things (NB-IOT) is currently the best technology for low power wide area (Low Power Wide Area, LPWA) applications. It uses a narrow bandwidth to realize the access of massive low-power devices in the fifth-generation mobile communication IoT scene. 3GPP proposes NB-IOT standards: 1. Modulation method: NB-IOT adopts SC-FDMA for uplink, OFDM for downlink, bandwidth 180kHZ, guard frequency band 10kHZ, three types of re-farming GSM frequency band / use of Guard-band / in-band resources Mode; 2, ultra-large coverage, MS can get GSM20dB gain when the transmission power is not higher than 23dBm, even in the case of independent deployment NB-IOT can reach 16dB; 3. Ultra-low power consumption, the terminal achieves ultra-long standby , under ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04W28/04H04W48/02
CPCH04W48/02H04W74/0816
Inventor 孙黎魏立鑫任品毅
Owner XI AN JIAOTONG UNIV