Narrowband Internet of Things NB-IoT random access method based on non-orthogonal technology

A narrowband Internet of Things, random access technology, used in machine-to-machine/machine-type communication services, electrical components, wireless communications, etc.

Active Publication Date: 2018-07-06
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In NOMA technology, although the time domain and frequency domain corresponding to the time-domain and frequency-domain resource units may also adopt an orthogonal scheme, since each

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  • Narrowband Internet of Things NB-IoT random access method based on non-orthogonal technology
  • Narrowband Internet of Things NB-IoT random access method based on non-orthogonal technology
  • Narrowband Internet of Things NB-IoT random access method based on non-orthogonal technology

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Embodiment Construction

[0058] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0059] The technical scheme that the present invention solves the problems of the technologies described above is:

[0060] In order to better illustrate the specific implementation steps of the method, refer to figure 1 , a non-orthogonal NB-IoT random access mechanism based on the following steps:

[0061] Step 1: Each user receives the system message broadcast on the NPBCH and obtains the RA configuration message, which includes three different sets of random access parameters, corresponding to three different coverage levels, and the user selects the corresponding one according to the current coverage level. Level configuration parameters mainly include NPRACH configuration time domain starting posit...

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Abstract

The invention provides a narrowband Internet of Things NB-IoT random access method based on the non-orthogonal technology. The narrowband Internet of Things NB-IoT random access method is applied to anarrowband Internet of Things random access method and is used for solving the problem of low random access success rate. The method comprises the following steps: 1-3, sending Msg1; 4, detecting, bya base station, multi-preamble of collision based on geographical distribution and transmitting RAR (that is, Msg2) with multiple users; 5, detecting, by a terminal, RAR; 6, estimating, by a user, TAby using an NPRS signal; 7, obtaining, by the user, RAR information, searching a TA value closest to the TA of the current user in the RAR, and obtaining corresponding Temp C-RNTI and Power BO; 8, transmitting Msg3, and opening a contention resolution timer CR; 9, separating the users based on the SIC technology; and 10-11, sending Msg4, and performing conflict resolution. According to the narrowband Internet of Things NB-IoT random access method, the multi-preamble detection and RAR reception are achieved by using the spatial distribution features of the user, the Msg3 is transmitted by using the non-orthogonal technology, the user separation is performed on the base station side, thereby effectively reducing the probability of preamble retransmission, improving the system capacity, andsolving the network congestion problem caused by large-scale connection of the NB-IoT system.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a random access mechanism of a Narrowband Internet of Things (NB-IoT) based on a non-orthogonal technology. It is used to alleviate the network congestion problem caused by the excessive number of users in the NB-IoT network. Background technique [0002] NOMA is a typical non-orthogonal multiple access technology only applied in the power domain, and it is also the simplest one among all non-orthogonal multiple access technologies. Because NOMA adopts the simple linear superposition of multiple user signal power domains, it has little impact on other existing mature multiple access technologies and mobile communication standards. In NOMA technology, although the time domain and frequency domain corresponding to the time-domain and frequency-domain resource units may also adopt an orthogonal scheme, since each resource unit carries multiple non-orthogona...

Claims

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Application Information

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IPC IPC(8): H04W4/70H04W74/00H04W74/08H04B1/7107
CPCH04B1/71072H04W74/004H04W74/006H04W74/0833
Inventor 李小文屈元远王丹陈发堂王华华刘宇杨艳娟牟泓彦陈其荣
Owner CHONGQING UNIV OF POSTS & TELECOMM
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