A discovery method and discovery system for D2D communication

Abstract

The present invention provides a discovery method and a discovery system for D2D communication. The discovery method includes the following steps: when a D2D discovery terminal and a D2D terminal to be discovered respectively search for a shared network for a first SIM card and a second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell, obtaining a first time-frequency resource position of the shared network cell; obtaining a D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource position; and sending a D2D direct communication invitation to the D2D terminal to be discovered according to the D2D terminal to be discovered identification information and the D2D discovery terminal identification information. The present invention can achieve D2D discovery between SIM cards belonging to different operators.

Description

Technical Field

[0001] The present invention relates to the technical field of direct communication, and particularly to a discovery method and a discovery system for D2D communication. Background Art

[0002] In the prior art, since D2D terminals inserted with SIM cards of different operators belong to different operator networks, and the common configuration information such as the time-frequency resource location, sequence format, and initial power parameter configured for D2D direct communication by different operator networks is different, D2D terminals inserted with SIM cards of different operators cannot detect D2D discovery signals from each other, and it is even more impossible to establish D2D direct communication. Summary of the Invention

[0003] An object of the present invention is to overcome the disadvantages and deficiencies in the prior art, and to provide a discovery method for D2D communication, which can achieve D2D discovery and connection between SIM cards belonging to different operators.

[0004] An embodiment of the present invention provides a discovery method for D2D communication, including the following steps:

[0005] When the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell, obtain the first time-frequency resource location of the shared network cell;

[0006] Obtain the D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource location; the D2D discovery signal includes D2D terminal to be discovered identification information;

[0007] According to the D2D terminal to be discovered identification information and the D2D discovery terminal identification information, send a D2D direct communication invitation to the D2D terminal to be discovered.

[0008] Compared with the prior art, in the discovery method for D2D communication of the present invention, when the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell, the D2D discovery terminal obtains the D2D discovery signal sent by the D2D terminal to be discovered at the same time-frequency resource location, and then the D2D discovery terminal and the D2D terminal to be discovered perform a direct communication connection, so as to achieve D2D communication discovery and connection between SIM cards belonging to different operators.

[0009] Further, the process in which the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell includes the following steps:

[0010] The D2D discovery terminal searches for the shared network according to the first PLMN list preset for the first SIM card. If the shared network is found, it camps on the shared network; otherwise, it searches for the shared network according to the second PLMN list preset for the first SIM card. If the shared network is found, it camps on the shared network.

[0011] Among them, the first PLMN list is used to save the PLMNs of the shared networks of non-home operators; the second PLMN list is used to save the PLMNs of the shared networks of home operators. Since the types of SIM cards covered by the shared networks of non-home operators are more than those of the shared networks of home operators, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D discovery terminal successfully searching for the shared network.

[0012] Further, the process in which the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell further includes the following steps;

[0013] The D2D terminal to be discovered searches for the shared network according to the first PLMN list preset for the second SIM card. If the shared network is found, it camps on the shared network; otherwise, it searches for the shared network according to the second PLMN list preset for the second SIM card. If the shared network is found, it camps on the shared network. Since the types of SIM cards covered by the shared networks of non-home operators are more than those of the shared networks of home operators, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D terminal to be discovered successfully searching for the shared network.

[0014] Further, when the D2D discovery terminal cannot find the shared network according to the second PLMN list preset for the first SIM card, the D2D discovery terminal blindly detects the D2D discovery signal in the full frequency band. By means of full-frequency band blind detection, the D2D discovery terminal can detect the D2D discovery signal when it cannot camp on the shared network.

[0015] Further, when the D2D terminal to be discovered cannot find the shared network according to the second PLMN list preset in the second SIM card, the D2D terminal to be discovered blindly sends the D2D discovery signal across the entire frequency band. By blindly sending across the entire frequency band, the D2D terminal to be discovered can send out the D2D discovery signal when it cannot camp on the shared network.

[0016] An embodiment of the present invention further provides a discovery system for D2D communication, including: a first time-frequency resource acquisition module, a D2D discovery signal acquisition module, and a direct communication invitation module;

[0017] The first time-frequency resource acquisition module is configured to acquire the position of the first time-frequency resource of the shared network cell when the D2D discovery terminal and the D2D terminal to be discovered respectively search for the shared network according to the preset network search strategy for the first SIM card and the second SIM card belonging to different operators and camp on the same shared network cell;

[0018] The D2D discovery signal acquisition module is configured to acquire the D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource position; the D2D discovery signal includes D2D terminal to be discovered identification information;

[0019] The direct communication invitation module is configured to send a D2D direct communication invitation to the D2D terminal to be discovered according to the D2D terminal to be discovered identification information and the D2D discovery terminal identification information.

[0020] Compared with the prior art, in the discovery system for D2D communication of the present invention, when the D2D discovery terminal and the D2D terminal to be discovered respectively search for the shared network according to the preset network search strategy for the first SIM card and the second SIM card belonging to different operators and camp on the same shared network cell, the D2D discovery terminal acquires the D2D discovery signal sent by the D2D terminal to be discovered at the same time-frequency resource position, and then the D2D discovery terminal and the D2D terminal to be discovered establish a direct communication connection, so as to realize the discovery and connection of D2D communication between SIM cards belonging to different operators.

[0021] Further, it further includes a first network camping module, and the first network camping module is configured to search for the shared network according to the first PLMN list preset in the first SIM card. If the shared network is found, camp on the shared network; otherwise, search for the shared network according to the second PLMN list preset in the first SIM card. If the shared network is found, camp on the shared network;

[0022] Among them, the first PLMN list is used to save the PLMNs of the non-home operator's shared network; the second PLMN list is used to save the PLMNs of the home operator's shared network. Since the types of SIM cards covered by the non-home operator's shared network are more than those of the home operator's shared network, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D discovery terminal successfully searching for the shared network.

[0023] Further, it further includes a second network residence module, which is used to search for the shared network according to the first PLMN list preset in the second SIM card. If the shared network is found, it will reside in the shared network; otherwise, it will search for the shared network according to the second PLMN list preset in the second SIM card. If the shared network is found, it will reside in the shared network. Since the types of SIM cards covered by the non-home operator's shared network are more than those of the home operator's shared network, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D discovery terminal successfully searching for the shared network.

[0024] An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the D2D communication discovery method as described above.

[0025] An embodiment of the present invention further provides a computer device, including a storage, a processor, and a computer program stored in the storage and executable by the processor. When the processor executes the computer program, it implements the steps of the D2D communication discovery method as described above.

[0026] In order to understand the present invention more clearly, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. Description of the Drawings

[0027] Figure 1 It is a flowchart of the D2D communication discovery method according to an embodiment of the present invention.

[0028] Figure 2 It is a module connection diagram of the D2D communication discovery system according to an embodiment of the present invention.

[0029] 1. First time-frequency resource acquisition module; 2. D2D discovery signal acquisition module; 3. Direct communication invitation module. Specific Embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figure 1 , which is a flowchart of a discovery method for Device-to-Device (D2D) communication according to an embodiment of the present invention, and includes the following steps:

[0032] S1: When the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first Subscriber Identity Module (SIM) card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell, obtain the first time-frequency resource position of the shared network cell;

[0033] S2: Obtain the D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource position; the D2D discovery signal includes D2D terminal to be discovered identification information;

[0034] S3: Send a D2D direct communication invitation to the D2D terminal to be discovered according to the D2D terminal to be discovered identification information and the D2D discovery terminal identification information.

[0035] D2D communication refers to a communication method in which two peer user nodes directly communicate with each other. Compared with other direct connection technologies that do not rely on basic network facilities, D2D is more flexible and can be connected under the control of a base station or perform information interaction when there is no network infrastructure.

[0036] The D2D discovery terminal and the D2D terminal to be discovered are communication terminals that can insert SIM cards, such as mobile phones, tablet computers, etc.

[0037] A SIM card is a user identification card for digital cellular mobile phones, used to connect network users to a mobile network. A mobile phone or a plug-in tablet computer can search for a mobile network by inserting a SIM card and camp on the mobile network. One SIM card uniquely identifies a customer. Multiple Public Land Mobile Networks (PLMNs) are set in the SIM card. A PLMN refers to the identifier of a mobile communication network, and each PLMN includes a Mobile Country Code (MCC) and a Mobile Network Code (MNC). Therefore, the PLMNs of each mobile communication operator are different.

[0038] The shared network refers to a mobile cellular network jointly built and used by at least two operators; for example, the access network of the shared co - built 5G (5th generation mobile networks) NSA (Non - Standalone) / SA (Standalone) network. Among them, due to the high communication rate of the 5G network, the coverage range of the 5G network becomes smaller. In order to reduce the construction cost of the 5G network, the shared network is constructed by the way that at least two operators jointly build and use the same mobile cellular network.

[0039] The shared network cell is the effective range of the shared network in a certain area. Since the shared network covers the range through multiple base stations, and one base station can generate at least one shared network cell, and the names or parameters of different shared network cells are not the same.

[0040] The first time - frequency resource location refers to the time domain and frequency domain allocated by the base station to the shared network cell for communication.

[0041] Compared with the prior art, in the D2D communication discovery method of the present invention, when the D2D discovery terminal and the D2D terminal to be discovered respectively search for the shared network for the first SIM card and the second SIM card belonging to different operators according to the preset network search strategy and camp on the same shared network cell, the D2D discovery terminal obtains the D2D discovery signal sent by the D2D terminal to be discovered at the same time - frequency resource location, and then the D2D discovery terminal and the D2D terminal to be discovered establish a direct communication connection, so as to realize the D2D communication discovery and connection between SIM cards belonging to different operators.

[0042] In a feasible embodiment, the process that the D2D discovery terminal and the D2D terminal to be discovered respectively search for the shared network for the first SIM card and the second SIM card belonging to different operators according to the preset network search strategy and camp on the same shared network cell includes the following steps:

[0043] The D2D discovery terminal searches for the shared network according to the first PLMN list preset for the first SIM card. If the shared network is found, it camps on the shared network; otherwise, it searches for the shared network according to the second PLMN list preset for the first SIM card. If the shared network is found, it camps on the shared network;

[0044] Among them, the first PLMN list is used to save the PLMNs of non - home - operator shared networks; the second PLMN list is used to save the PLMNs of home - operator shared networks.

[0045] The PLMN of the non-home operator's shared network is the PLMN shared by other operators for camping on the shared network, and the PLMN of the home operator's shared network is the PLMN set by the SIM card home operator for camping on the shared network. Since the shared network is jointly built and used by at least two operators, the number of PLMNs shared by other operators for camping on the shared network is larger than the number of PLMNs set by the SIM card home operator for camping on the shared network. Therefore, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D discovery terminal successfully searching for the shared network.

[0046] In a feasible embodiment, the process in which the D2D discovery terminal and the D2D terminal to be discovered search for the shared network for the first SIM card and the second SIM card belonging to different operators respectively according to a preset network search strategy and camp on the same shared network cell further includes the following steps;

[0047] The D2D terminal to be discovered searches for the shared network according to the first PLMN list preset for the second SIM card. If the shared network is found, it camps on the shared network; otherwise, it searches for the shared network according to the second PLMN list preset for the second SIM card. If the shared network is found, it camps on the shared network.

[0048] Since the types of SIM cards covered by the non-home operator's shared network are more than those of the home operator's shared network, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D terminal to be discovered successfully searching for the shared network.

[0049] In a feasible embodiment, when the D2D discovery terminal cannot find the shared network according to the second PLMN list preset for the first SIM card, the D2D discovery terminal blindly detects the D2D discovery signal in the full frequency band.

[0050] The blind detection means that the D2D discovery terminal knows that it needs to expect the D2D discovery signal, but does not know the specific position of the D2D discovery signal and can only search one by one in the full frequency band. However, its search efficiency is low. But through the method of full-frequency band blind detection, the D2D discovery terminal may still find the D2D discovery signal when it cannot camp on the shared network.

[0051] In a feasible embodiment, when the D2D terminal to be discovered cannot find the shared network according to the second PLMN list preset by the second SIM card, the D2D terminal to be discovered blindly sends the D2D discovery signal across all frequency bands. By blindly sending across all frequency bands, the D2D terminal to be discovered can send out the D2D discovery signal when it cannot camp on the shared network.

[0052] The blind sending may be that the D2D terminal to be discovered sends the D2D discovery signal on any one frequency band, or sends the D2D discovery signal on different frequency bands according to the set sending period. Preferably, the period of blind detection and the period of blind sending are not equal to avoid being on different frequency bands for a long time due to equal periods.

[0053] An embodiment of the present invention further provides a discovery system for D2D communication, including: a first time-frequency resource acquisition module 1, a D2D discovery signal acquisition module 2, and a direct communication invitation module 3;

[0054] The first time-frequency resource acquisition module 1 is used to acquire the position of the first time-frequency resource of the shared network cell when the D2D discovery terminal and the D2D terminal to be discovered respectively search for the shared network for the first SIM card and the second SIM card belonging to different operators according to the preset network search strategy and camp on the same shared network cell;

[0055] The D2D discovery signal acquisition module 2 is used to acquire the D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource position; the D2D discovery signal includes the identification information of the D2D terminal to be discovered;

[0056] The direct communication invitation module 3 is used to send a D2D direct communication invitation to the D2D terminal to be discovered according to the identification information of the D2D terminal to be discovered and the identification information of the D2D discovery terminal.

[0057] The D2D discovery terminal and the D2D terminal to be discovered are communication terminals that can insert SIM cards, such as mobile phones, tablet computers, etc.

[0058] The SIM card is the user identification card of a digital cellular mobile phone, used to connect network users to the mobile network. A mobile phone or a plug-in tablet computer can search for and camp on the mobile network by inserting a SIM card. One SIM card uniquely identifies a customer. Multiple PLMNs are set in the SIM card. PLMN refers to the identifier of a mobile communication network. Each PLMN includes MCC (Mobile country code, country code) and MNC (Mobile Network Code, mobile network code). Therefore, the PLMNs of each mobile communication operator are different.

[0059] The shared network refers to a mobile cellular network jointly built and used by at least two operators; for example, the access network of a shared and co - built 5G (5th generation mobile networks) NSA (Non - Standalone) / SA (Standalone) network. Among them, due to the high communication rate of the 5G network, the coverage range of the 5G network becomes smaller. In order to reduce the construction cost of the 5G network, the shared network is constructed by at least two operators jointly building and using the same mobile cellular network.

[0060] The shared network cell is the effective range of the shared network in a certain area. Since the shared network covers a range through multiple base stations, and one base station can generate at least one shared network cell, and the names or parameters of different shared network cells are not the same.

[0061] The first time - frequency resource position refers to the time domain and frequency domain allocated by the base station to the shared network cell for communication.

[0062] Compared with the prior art, when the D2D discovery system of the present invention searches for the shared network according to a preset network search strategy on the first SIM card and the second SIM card belonging to different operators by the D2D discovery terminal and the D2D to - be - discovered terminal respectively and resides in the same shared network cell, the D2D discovery terminal acquires the D2D discovery signal sent by the D2D to - be - discovered terminal at the same time - frequency resource position, and then the D2D discovery terminal and the D2D to - be - discovered terminal establish a direct communication connection, so as to realize D2D communication discovery and connection between SIM cards belonging to different operators.

[0063] In a feasible embodiment, it further includes a first network - residence module, which is used to search for the shared network according to the first PLMN list preset for the first SIM card. If the shared network is found, it resides in the shared network; otherwise, it searches for the shared network according to the second PLMN list preset for the first SIM card. If the shared network is found, it resides in the shared network.

[0064] Among them, the first PLMN list is used to save the PLMNs of non - home - operator shared networks; the second PLMN list is used to save the PLMNs of home - operator shared networks.

[0065] The PLMN of the non-home operator's shared network is the PLMN shared by other operators for camping on the shared network, and the PLMN of the home operator's shared network is the PLMN set by the SIM card home operator for camping on the shared network. Since the shared network is jointly built and used by at least two operators, the number of PLMNs shared by other operators for camping on the shared network is more than the number of PLMNs set by the SIM card home operator for camping on the shared network. Therefore, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D discovery terminal successfully searching for the shared network.

[0066] In a feasible embodiment, it further includes a second network camping module, which is configured to search for the shared network according to the first PLMN list preset in the second SIM card. If the shared network is found, camp on the shared network; otherwise, search for the shared network according to the second PLMN list preset in the second SIM card. If the shared network is found, camp on the shared network.

[0067] Since the types of SIM cards covered by the non-home operator's shared network are more than those of the home operator's shared network, searching for the shared network according to the first PLMN list first can improve the efficiency of the D2D discovery terminal successfully searching for the shared network.

[0068] An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the D2D communication discovery method described above.

[0069] An embodiment of the present invention further provides a computer device, including a storage, a processor, and a computer program stored in the storage and executable by the processor. When the processor executes the computer program, it implements the steps of the D2D communication discovery method described above.

[0070] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A discovery method for D2D communication, characterized in that, Including the following steps: When the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell, obtain the first time-frequency resource position of the shared network cell; Obtain the D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource position; The D2D discovery signal includes D2D terminal to be discovered identification information; According to the D2D terminal to be discovered identification information and the D2D discovery terminal identification information, send a D2D direct communication invitation to the D2D terminal to be discovered; The process that the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell includes the following steps: The D2D discovery terminal searches for the shared network according to the first PLMN list preset for the first SIM card. If the shared network is found, camp on the shared network; otherwise, search for the shared network according to the second PLMN list preset for the first SIM card. If the shared network is found, camp on the shared network; Wherein, the first PLMN list is used to save the PLMN of the non-home operator's shared network; the second PLMN list is used to save the PLMN of the home operator's shared network.

2. The discovery method for D2D communication according to claim 1, characterized in that, The process that the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell further includes the following steps; The D2D terminal to be discovered searches for the shared network according to the first PLMN list preset for the second SIM card. If the shared network is found, camp on the shared network; otherwise, search for the shared network according to the second PLMN list preset for the second SIM card. If the shared network is found, camp on the shared network.

3. The discovery method for D2D communication according to claim 2, characterized in that: When the D2D discovery terminal cannot find the shared network according to the second PLMN list preset for the first SIM card, the D2D discovery terminal blindly detects the D2D discovery signal in the full frequency band.

4. The discovery method for D2D communication according to claim 3, characterized in that: When the D2D terminal to be discovered cannot find the shared network according to the second PLMN list preset for the second SIM card, the D2D terminal to be discovered blindly sends the D2D discovery signal in the full frequency band.

5. A discovery system for D2D communication, characterized in that, Including: A first time-frequency resource acquisition module, a D2D discovery signal acquisition module, and a direct communication invitation module; The first time-frequency resource acquisition module is used to obtain the first time-frequency resource position of the shared network cell when the D2D discovery terminal and the D2D terminal to be discovered respectively search for a shared network for the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and camp on the same shared network cell; The D2D discovery signal acquisition module is configured to acquire a D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource position; the D2D discovery signal includes D2D terminal identification information to be discovered; The direct communication invitation module is configured to send a D2D direct communication invitation to the D2D terminal to be discovered according to the D2D terminal identification information to be discovered and the D2D discovery terminal identification information; It further includes a first network residence module, which is configured to search for the shared network according to the first PLMN list preset in the first SIM card. If the shared network is found, it will reside in the shared network; otherwise, it will search for the shared network according to the second PLMN list preset in the first SIM card. If the shared network is found, it will reside in the shared network; Among them, the first PLMN list is used to save the PLMNs of non-home operator shared networks; the second PLMN list is used to save the PLMNs of home operator shared networks.

6. The discovery system for D2D communication according to claim 5, characterized in that: It further includes a second network residence module, which is configured to search for the shared network according to the first PLMN list preset in the second SIM card. If the shared network is found, it will reside in the shared network; otherwise, it will search for the shared network according to the second PLMN list preset in the second SIM card. If the shared network is found, it will reside in the shared network.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

8. A computer device, characterized in that: It includes a storage, a processor, and a computer program stored in the storage and executable by the processor. When the processor executes the computer program, it implements the steps of the method according to any one of claims 1-4.

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