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A Time-Frequency Two-Dimensional Sparse Code Multiple Access Method for Narrowband Internet of Things

A sparse code multiple access, narrowband IoT technology, applied in the field of multiple access, can solve problems such as lack of multiple access methods, and achieve the effect of increasing the number of users, improving performance, and increasing the number of user connections

Inactive Publication Date: 2020-02-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sparse Code Multiple Access SCMA (Sparse Code Multiple Access) to be adopted by 5G is a new type of non-orthogonal multiple access technology. Therefore, the SCMA used in 5G requires the user equipment (UE) to have the ability to transmit and receive multiple channels / subcarriers, which is in contradiction with the cost, energy saving and narrowband requirements of current narrowband IoT devices.
[0006] To sum up, there is currently a lack of a multiple access method to obtain the advantages of non-orthogonal multiple access based on narrowband IoT

Method used

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  • A Time-Frequency Two-Dimensional Sparse Code Multiple Access Method for Narrowband Internet of Things
  • A Time-Frequency Two-Dimensional Sparse Code Multiple Access Method for Narrowband Internet of Things
  • A Time-Frequency Two-Dimensional Sparse Code Multiple Access Method for Narrowband Internet of Things

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 2 As shown, Embodiment 1 describes the pure time-domain SCMA method when the 5G cellular network has only one narrowband IoT channel. The narrowband IoT is divided into multiple time slots, and N time slots form an SCMA resource block, which is used by the UE Block transfer data.

[0045] Step 1: Divide each frame of narrowband IoT into time slots, and use N time slots as an SCMA resource block for a group of UEs.

[0046]Specific steps are as follows:

[0047] Step 1.1: Divide each frame on narrowband IoT into time slots, figure 2 In the example, 10 time slots are divided based on the frame structure of the fourth generation mobile communication system (4G). As a typical configuration, the present invention supports other flexible time slot division methods, which are determined by specific wireless network protocols.

[0048] Step 1.2: N time slots form a SCMA resource block, which is allocated to the UE. figure 2 Among them, Slot 0 is used for sche...

Embodiment 2

[0058] Such as image 3 As shown, Embodiment 2 describes the time-domain SCMA method in the case of multiple independent narrowband IoT channels in the 5G cellular network, that is, extending Embodiment 1 to the situation of multiple independent narrowband channels, and multiple narrowband IoT channels are divided into multiple time slots, and N time slots on each narrowband constitute a SCMA resource block, different narrowband channels are independent of each other, and the UE uses resource blocks to transmit data.

[0059] Step 1: Divide each narrowband IoT frame into time slots, and use N time slots on each narrowband as an SCMA time-frequency resource block for a group of UEs.

[0060] Specific steps are as follows:

[0061] Step 1.1: Divide each frame on the narrowband into time slots, image 3 In the example, 10 time slots are divided into 2 channels based on the 4G frame structure as a typical configuration, and the time slot division method is determined by the spec...

Embodiment 3

[0073] Such as Figure 4 As shown, embodiment three describes the time-frequency two-dimensional SCMA method in the case of multiple narrowband channels in the 5G cellular network, which is to change the channel in embodiment two into a non-independent case, and multiple time slots and multiple channels together An SCMA resource block is formed, and the UE uses this resource block to transmit data.

[0074] Step 1: Divide narrowband channels into time slots, and use N time slots on multiple narrowbands together as an SCMA time-frequency resource block, and assign them to a group of UEs.

[0075] Specific steps are as follows:

[0076] Step 1.1: Divide each frame on the narrowband into time slots, figure 2 The two channels are divided into 10 time slots respectively as a typical configuration, but the present invention supports other flexible time slot division methods, which are determined by specific wireless network protocols.

[0077] Step 1.2: N time slots on multiple n...

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Abstract

The invention provides a narrow band Internet of things oriented time-frequency two-dimensional sparse code multiple access method and relates to the technical field of communication. Time slots are divided on a narrow band. N time-frequency resource units form an SCMA (Sparse Code Multiple Access) time-frequency resource block, so a cellular mobile or wireless local area network communication system indicates that the SCMA time-frequency resource block is used for performing an uplink scheduling access step, an uplink scheduling-free access step, an uplink mixed scheduling access step and a downlink access step. The fact that the SCMA only works in a frequency domain is changed to time frequency two-dimensional work. According to the method, through adoption of the time frequency two-dimensional sparse code nonorthogonal multiple access, the SCMA technology is expanded from the frequency domain to the time frequency two-dimensional work, the narrowband characteristic of an IoT device is ensured, and the mobile communication user connection quantity, a spectrum utilization rate and a network capacity are improved. Compared with the prior art, the method has the advantages that under the same bit error rate, each of the user quantity and the network capacity is improved to 1.5 times, and the performance of a mobile communication system is greatly improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a multiple access method. Background technique [0002] The Internet of Things (IoT) is an important part of the new generation of communication technology, referring to the Internet where things are connected, and is an inevitable trend in the development of wireless and mobile networks. [0003] The core and foundation of the Internet of Things is the Internet, which is a network that extends and expands on the basis of the Internet, and because of the mobility of its devices, it requires the support of traditional wireless networks. However, due to the cost of IoT devices, energy-saving requirements, and the limitation of the traffic volume of a single transmission of a single device, IoT devices have narrow-band characteristics, while traditional cellular networks (3G and 4G) and wireless LANs (IEEE 802.1x) have high-speed The characteristics of broadband, resulting in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04W72/04
CPCH04L5/0037H04L5/0039H04L5/0044H04L5/0094H04W72/0446
Inventor 杨懋左晓亚雷蕾白志城闫中江李波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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