WO2020211025A1

WO2020211025A1 - Cellular communication system based on duplex d2d communication, and communication mode selection method therefor

Info

Publication number: WO2020211025A1
Application number: PCT/CN2019/083155
Authority: WO
Inventors: 冯大权; 龙立泰; 钱恭斌
Original assignee: 深圳大学
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2020-10-22

Abstract

Disclosed are a cellular communication system based on duplex D2D communication, and a communication mode selection method therefor. Duplex D2D communication technology is introduced on the basis of an existing cellular network. By means of detecting the current channel condition, and thereby selecting a full-duplex D2D communication mode, a half-duplex D2D communication mode or a traditional cellular communication mode to carry out communication between wireless terminals, the communication modes are flexibly selected, the degree of freedom of communication is relatively high, and the throughput of the cellular communication system can be improved, thereby improving the QoS under the condition of user congestion or for cell edge users, reducing the short-distance P2P communication delay, and improving the communication reliability. According to the present invention, the transmission rate is improved using a gain brought to short-distance communication by full-duplex D2D communication technology, and the requirements for the transmission power of a wireless device are also effectively reduced. The present invention supports various QoS requirements, conforms to the future development trend of wireless networks, will be an important basis for large-scale Internet of Things in the future, and will also be an important technical carrier for 5G communication in the future.

Description

Cellular communication system based on duplex D2D communication and its communication mode selection method

Technical field

The present invention relates to mobile communication technology, in particular to a cellular communication system based on duplex D2D (Device-to-Device) communication and a communication mode selection method thereof.

Background technique

The traditional cellular communication technology uses base station-based two-hop transmission, that is, the calling user sends a message to the base station, and the base station transmits the message entity to the called user. This communication method occupies double bandwidth for uplink transmission and downlink transmission, which can meet the application scenarios of sparse users. However, in the case of user congestion, or for users at the edge of the cell, due to its QoS (Quality of Service) dropped (out of service) caused by a significant drop. At the same time, the traditional cellular communication technology based on base station two-hop transmission cannot well meet the increasing demand for delay and reliability of large-scale short-distance P2P (Point-to-Point) communication and the transmission power of mobile communication equipment. Claim.

technical problem

The main purpose of the present invention is to provide a cellular communication system based on duplex D2D communication and a communication mode selection method thereof, so as to improve the Qos quality for users at the edge of a cell under user congestion, reduce short-distance P2P communication delay, and improve Communication reliability reduces the requirements on the transmission power of communication equipment.

Technical solutions

The present invention is realized through the following technical solutions:

A cellular communication system based on duplex D2D communication, including a base station and a number of wireless terminals that support full-duplex D2D communication and half-duplex D2D communication. When channel conditions permit, control between wireless terminals at the base station It can perform full-duplex D2D communication or half-duplex D2D communication, and can also perform cellular communication through the base station, and the base station detects the current channel conditions of the wireless terminal in real time;

When the current channel conditions satisfy the full-duplex D2D communication between the wireless terminals, the base station controls the full-duplex D2D communication between the wireless terminals;

When the current channel conditions do not satisfy the full-duplex D2D communication between the wireless terminals, but the half-duplex D2D communication between the wireless terminals is satisfied, the base station controls the half-duplex D2D communication between the wireless terminals;

When the current channel condition is neither sufficient for full-duplex D2D communication between wireless terminals nor for half-duplex D2D communication between wireless terminals, the base station controls wireless terminals to perform cellular communication through the base station.

Further, when performing full-duplex D2D communication and half-duplex D2D communication between wireless terminals, the uplink frequency band of the cellular communication system is multiplexed.

Further, when performing full-duplex D2D communication between wireless terminals, data transmission is performed at an optimal transmission rate.

Further, the full-duplex D2D communication and the half-duplex D2D communication are both D2D communication based on the PC5 link, or both are D2D communication based on the device-to-network relay.

A communication mode selection method based on duplex D2D communication, the method comprising:

The base station detects the current channel conditions of the wireless terminal in real time, and the wireless terminal supports full-duplex D2D communication and half-duplex D2D communication;

A computer-readable storage medium has a computer program stored thereon, and when the computer program is executed by a processor, the method for selecting a communication mode as described above is realized.

An electronic device installed in a base station, including a memory, a processor, and a computer program that is stored in the memory and can run on the processor. When the processor executes the computer program, the implementation is as described above Communication mode selection method.

Beneficial effect

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The present invention introduces duplex D2D communication technology on the basis of the existing cellular network, detects the current channel conditions, and selects full-duplex D2D communication, half-duplex D2D communication or traditional cellular communication mode for wireless terminal For inter-communication, the choice of communication mode is flexible, and it has a higher degree of communication freedom, which can improve the throughput of the cellular communication system, thereby improving the Qos quality for users in crowded situations or for cell edge users, and reducing short-distance P2P communication delays. Improve communication reliability.

2. The present invention uses the gain brought by the full-duplex D2D communication technology to short-distance communication to increase the transmission rate, and also effectively reduces the requirements for the transmission power of the wireless device.

3. The present invention supports various QoS requirements, conforms to the development trend of future wireless networks, is an important foundation for the future large-scale Internet of Things, and is also an important technology carrier for future 5G communications.

Description of the drawings

Fig. 1 is a schematic diagram of the composition principle of a cellular communication system based on duplex D2D communication according to an embodiment of the present invention;

2 is a schematic flowchart of a method for selecting a communication mode of a cellular communication system based on duplex D2D communication according to the second embodiment of the present invention.

Embodiments of the invention

In order to make the purposes, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the description The embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of this application.

It should be noted that in this article, the term "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes no The other elements clearly listed may also include elements inherent to the process, method, article or device.

As shown in Figure 1, the cellular communication system based on duplex D2D communication provided by the first embodiment of the present invention includes a base station 1 and a number of wireless terminals 2 that support full-duplex D2D communication and half-duplex D2D communication. In this case, the wireless terminals 2 can perform full-duplex D2D communication or half-duplex D2D communication under the control of the base station 1, and can also perform cellular communication through the base station 1. D2D is Device-to-Device, and D2D communication is also called terminal pass-through. D2D communication technology refers to a communication method in which two peer user nodes communicate directly. In a distributed network composed of D2D communication users, each user node can send and receive signals, and has the function of automatic routing (forwarding messages). Participants of the network share part of their own hardware resources, including information processing, storage, and network connection capabilities. These shared resources provide services and resources to the network and can be directly accessed by other users without passing through intermediate entities. In a D2D communication network, user nodes play the roles of server and client at the same time, and users can be aware of each other's existence and self-organize to form a virtual or actual group. Duplex communication allows data to be transmitted in both directions between two devices. Duplex communication includes full-duplex communication and half-duplex communication. Full duplex (Full Duplex) communication allows data to be transmitted in both directions at the same time, and half duplex (Half Duplex) communication also allows data to be transmitted in both directions, but not in both directions. The base station 1 detects the current channel conditions of the wireless terminal 2 in real time, and controls the communication between the wireless terminals 2 according to the current channel conditions of the wireless terminal 2.

When the current channel conditions satisfy the full-duplex D2D communication between the wireless terminals 2, the base station 1 controls the full-duplex D2D communication between the wireless terminals 2.

When the current channel condition does not satisfy the full-duplex D2D communication between the wireless terminals 2 but satisfies the half-duplex D2D communication between the wireless terminals 2, the base station 1 controls the wireless terminals 2 to perform the half-duplex D2D communication.

When the current channel conditions are neither sufficient for full-duplex D2D communication between wireless terminals 2 nor for half-duplex D2D communication between wireless terminals 2, base station 1 controls wireless terminals 2 to perform cellular communication through base station 1. During cellular communication, the D2D device will equally share the orthogonal frequency resources of the cellular communication system with other cellular communication devices.

By measuring the current channel conditions in real time and selecting the corresponding communication mode for communication between the wireless terminals 2, a higher degree of communication freedom can be achieved, and the throughput of the cellular communication system can be improved, thereby improving user congestion or cell edge users. Qos quality reduces short-distance P2P communication delay and improves communication reliability.

In view of the fact that the processing capacity of base station 1 is stronger than that of mobile devices, the uplink utilization rate of the existing cellular communication system is low, and to ensure the fairness of the services of mobile devices, wireless terminals 2 perform full-duplex D2D communication and half-duplex communication In D2D communication, the uplink frequency band of the cellular communication system can be reused to achieve better utilization of spectrum resources and improve communication quality.

When full-duplex D2D communication is performed between the wireless terminals 2, data transmission can be performed at an optimal transmission rate to improve communication performance.

In this embodiment, both full-duplex D2D communication and half-duplex D2D communication are D2D communication based on the PC5 link, or both are D2D communication based on device-to-network relay.

In this embodiment, both full-duplex D2D communication and half-duplex D2D communication adopt ProSe-D2D (Proximity Services Device to Device, D2D-based short-range service) communication protocol. The ProSe-D2D communication protocol is 3GPP-Rel-12 (3rd Generation Partnership Project Release-12).

The second embodiment of the present invention provides a method for selecting a communication mode of a cellular communication system based on duplex D2D communication. The cellular communication system includes a base station 1 and a number of wireless terminals 2 supporting full-duplex D2D communication and half-duplex D2D communication. If permitted, the wireless terminals 2 can perform full-duplex D2D communication or half-duplex D2D communication under the control of the base station 1, and can also perform cellular communication through the base station 1. As shown in Figure 2, the communication mode selection method includes:

The base station 1 detects the current channel conditions of the wireless terminal 2 in real time, and controls the communication between the wireless terminals 2 according to the current channel conditions of the wireless terminal 2.

When the current channel conditions are neither sufficient for full-duplex D2D communication between wireless terminals 2 nor for half-duplex D2D communication between wireless terminals 2, base station 1 controls wireless terminals 2 to perform cellular communication through base station 1.

When performing full-duplex D2D communication and half-duplex D2D communication between the wireless terminals 2, the uplink frequency band of the cellular communication system is reused.

When performing full-duplex D2D communication between the wireless terminals 2, data transmission is performed at the optimal transmission rate.

Both full-duplex D2D communication and half-duplex D2D communication are D2D communication based on the PC5 link, or both are D2D communication based on device-to-network relay.

Both full-duplex D2D communication and half-duplex D2D communication use the ProSe-D2D communication protocol.

The third embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the communication mode selection method of the second embodiment is implemented. The computer storage medium can also be U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), RAM, magnetic disks or optical disks and other media that can store program codes.

The fourth embodiment of the present invention also provides an electronic device, which is installed in a base station and includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The processor When the computer program is executed, the communication mode selection method of the second embodiment is implemented.

The above-mentioned embodiments are only preferred embodiments, and are not intended to limit the scope of protection of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention. .

Claims

A cellular communication system based on duplex D2D communication, including a base station and a number of wireless terminals that support full-duplex D2D communication and half-duplex D2D communication. When channel conditions permit, control between wireless terminals at the base station It can perform full-duplex D2D communication or half-duplex D2D communication, and can also perform cellular communication through the base station, characterized in that:

The base station detects the current channel conditions of the wireless terminal in real time;

When the current channel conditions satisfy the full-duplex D2D communication between the wireless terminals, the base station controls the full-duplex D2D communication between the wireless terminals;

When the current channel conditions do not satisfy the full-duplex D2D communication between the wireless terminals, but the half-duplex D2D communication between the wireless terminals is satisfied, the base station controls the half-duplex D2D communication between the wireless terminals;

When the current channel condition is neither sufficient for full-duplex D2D communication between wireless terminals nor for half-duplex D2D communication between wireless terminals, the base station controls wireless terminals to perform cellular communication through the base station.
The communication system according to claim 1, wherein when full-duplex D2D communication and half-duplex D2D communication are performed between wireless terminals, the uplink frequency band of the cellular communication system is reused.
The communication system according to claim 1, wherein when full-duplex D2D communication is performed between wireless terminals, data transmission is performed at an optimal transmission rate.
The communication system according to claim 1, wherein the full-duplex D2D communication and the half-duplex D2D communication are both D2D communication based on the PC5 link, or both are D2D communication based on device-to-network relay.
A communication mode selection method based on duplex D2D communication is characterized in that the method includes:

The base station detects the current channel conditions of the wireless terminal in real time, and the wireless terminal supports full-duplex D2D communication and half-duplex D2D communication;

When the current channel conditions satisfy the full-duplex D2D communication between the wireless terminals, the base station controls the full-duplex D2D communication between the wireless terminals;

When the current channel conditions do not satisfy the full-duplex D2D communication between the wireless terminals, but the half-duplex D2D communication between the wireless terminals is satisfied, the base station controls the half-duplex D2D communication between the wireless terminals;

When the current channel condition is neither sufficient for full-duplex D2D communication between wireless terminals nor for half-duplex D2D communication between wireless terminals, the base station controls wireless terminals to perform cellular communication through the base station.
The communication mode selection method according to claim 5, wherein when performing full-duplex D2D communication and half-duplex D2D communication between wireless terminals, the uplink frequency band of the cellular communication system is multiplexed.
5. The communication mode selection method according to claim 5, wherein when performing full-duplex D2D communication between wireless terminals, data transmission is performed at an optimal transmission rate.
The communication mode selection method according to claim 5, wherein the full-duplex D2D communication and half-duplex D2D communication are both D2D communication based on PC5 link, or both are D2D based on device-to-network relay. Communication.
A computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the communication mode selection method according to any one of claims 5 to 8 when the computer program is executed by a processor.
An electronic device, which is installed in a base station and includes a memory, a processor, and a computer program that is stored in the memory and can run on the processor, and when the processor executes the computer program, The communication mode selection method according to any one of claims 5 to 8 is realized.