CN115134814A - Discovery method and discovery system for D2D communication - Google Patents

Discovery method and discovery system for D2D communication Download PDF

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Publication number
CN115134814A
CN115134814A CN202110326380.8A CN202110326380A CN115134814A CN 115134814 A CN115134814 A CN 115134814A CN 202110326380 A CN202110326380 A CN 202110326380A CN 115134814 A CN115134814 A CN 115134814A
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shared network
terminal
discovery
sim card
network
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张子敬
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Xi'an Zhongnuo Communication Co ltd
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Xi'an Zhongnuo Communication Co ltd
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Priority to CN202110326380.8A priority Critical patent/CN115134814A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

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

Description

Discovery method and discovery system for D2D communication
Technical Field
The invention relates to the technical field of direct connection communication, in particular to a discovery method and a discovery system for D2D communication.
Background
In the prior art center, because the D2D terminals into which the SIM cards of different operators are inserted belong to different operator networks, and the time-frequency resource positions, sequence formats, initial power parameters and other public configuration information configured for D2D direct communication by the different operator networks are different, the D2D terminals into which the SIM cards of different operators are inserted cannot detect a D2D discovery signal, and even cannot establish D2D direct communication.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provide a discovery method of D2D communication, which can realize D2D discovery and connection between SIM cards belonging to different operators.
One embodiment of the present invention provides a discovery method for D2D communication, including the following steps:
when the D2D discovery terminal and the D2D terminal to be discovered respectively search shared networks for a first SIM card and a second SIM card belonging to different operators according to a preset network search strategy and reside in the same shared network cell, acquiring a first time-frequency resource position of the shared network cell;
acquiring 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 to-be-discovered terminal identification information;
and sending a D2D direct communication invitation to the D2D terminal to be found according to the identification information of the D2D terminal to be found and the identification information of the D2D terminal to be found.
Compared with the prior art, in the D2D communication discovery method, when the D2D discovery terminal and the D2D to-be-discovered terminal respectively perform shared network search on a first SIM card and a second SIM card belonging to different operators according to a preset network search policy and reside in the same shared network cell, the D2D discovery terminal acquires a D2D discovery signal sent by the D2D to-be-discovered terminal in the same time-frequency resource position, and then the D2D discovery terminal and the D2D to perform direct communication connection, so that D2D communication discovery and connection between the SIM cards belonging to different operators are realized.
Further, the process that the D2D discovery terminal and the D2D terminal to be discovered respectively search the shared network for the first SIM card and the second SIM card belonging to different operators according to the preset network search policy and camp on the same shared network cell includes the following steps:
the D2D discovery terminal searches the shared network according to a first PLMN list preset by the first SIM card, and if the shared network is searched, the shared network resides; otherwise, searching the shared network according to a second PLMN list preset by the first SIM card, and if the shared network is searched, residing the shared network;
wherein the first PLMN list is used for storing PLMNs of a non-home operator shared network; the second PLMN list is used to store PLMNs of the home operator shared network. Since the SIM card types covered by the non-home operator shared network are more than those covered by the home operator shared network, firstly searching the shared network according to the first PLMN list can improve the efficiency of successfully searching the shared network by the D2D discovery terminal.
Further, the process that the D2D discovery terminal and the D2D terminal to be discovered respectively search for the shared network of the first SIM card and the second SIM card belonging to different operators according to the preset network search policy and reside in the same shared network cell further includes the following steps;
the D2D terminal to be found searches the shared network according to a first PLMN list preset by the second SIM card, and if the shared network is searched, the shared network is resided; otherwise, searching the shared network according to a second PLMN list preset by the second SIM card, and if the shared network is searched, residing the shared network. Since the types of SIM cards covered by the non-home operator shared network are more than those of the home operator shared network, firstly searching the shared network according to the first PLMN list can improve the efficiency of successfully searching the shared network by the D2D terminal to be discovered.
Further, when the D2D finds that the terminal cannot search the shared network according to the second PLMN list preset by the first SIM card, the D2D finds that the terminal blindly detects the D2D discovery signal in the full frequency band. Through a full-band blind detection mode, the D2D discovery terminal can detect the D2D discovery signal when the terminal does not camp on the shared network.
Further, when the D2D terminal to be discovered cannot search the shared network according to a second PLMN list preset by the second SIM card, the D2D terminal to be discovered blindly transmits the D2D discovery signal in a full frequency band. And through a full-band blind transmission mode, the D2D terminal to be discovered can send out the D2D discovery signal when the terminal does not reside in the shared network.
An embodiment of the present invention further provides a discovery system for D2D communication, including: the system comprises a first time-frequency resource acquisition module, a D2D discovery signal acquisition module and a direct connection communication invitation module;
the first time-frequency resource acquisition module is configured to acquire a first time-frequency resource location of a shared network cell when the D2D discovery terminal and the D2D terminal to be discovered respectively search for shared networks of first SIM cards and second SIM cards belonging to different operators according to a preset network search policy and reside in the same shared network cell;
the D2D discovery signal acquiring module is configured to acquire a D2D discovery signal transmitted by the D2D terminal to be discovered in the first time-frequency resource location; the D2D discovery signal includes D2D to-be-discovered terminal identification information;
the direct communication invitation module is used for sending a D2D direct communication invitation to the D2D terminal to be found according to the identification information of the D2D terminal to be found and the identification information of the D2D terminal to be found.
Compared with the prior art, when the D2D discovery terminal and the D2D to-be-discovered terminal respectively perform shared network search on a first SIM card and a second SIM card belonging to different operators according to a preset network search policy and reside in the same shared network cell, the D2D discovery terminal acquires a D2D discovery signal sent by the D2D to-be-discovered terminal in the same time-frequency resource position, and then the D2D discovery terminal and the D2D to-be-discovered terminal perform direct connection communication connection, so that D2D communication discovery and connection between the SIM cards belonging to different operators are realized.
The first resident network module is used for searching the shared network according to a first PLMN list preset by the first SIM card, and if the shared network is searched, the shared network is resident; otherwise, searching the shared network according to a second PLMN list preset by the first SIM card, and if the shared network is searched, residing the shared network;
wherein the first PLMN list is used for storing PLMNs of a non-home operator shared network; the second PLMN list is used to store PLMNs of the home operator shared network. Since the SIM card types covered by the non-home operator shared network are more than those covered by the home operator shared network, firstly searching the shared network according to the first PLMN list can improve the efficiency of successfully searching the shared network by the D2D discovery terminal.
The second resident network module is used for searching the shared network according to a first PLMN list preset by the second SIM card, and if the shared network is searched, the shared network is resident; otherwise, searching the shared network according to a second PLMN list preset by the second SIM card, and if the shared network is searched, residing the shared network. Since the types of SIM cards covered by the non-home operator shared network are more than those of the home operator shared network, firstly searching the shared network according to the first PLMN list can improve the efficiency of successfully searching the shared network by the D2D terminal to be discovered.
An embodiment of the present invention also provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the discovery method of D2D communication as described above.
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, wherein the processor implements the steps of the discovery method of D2D communication as described above when executing the computer program.
In order that the invention may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.
Drawings
Fig. 1 is a flowchart of a discovery method of D2D communication according to an embodiment of the present invention.
Fig. 2 is a block diagram of a discovery system for D2D communication according to an embodiment of the present invention.
1. A first time-frequency resource acquisition module; 2. D2D finds a signal acquisition module; 3. and a direct connection communication invitation module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to fig. 1, which is a flowchart illustrating a Device-to-Device Communication discovery method according to an embodiment of the present invention, including the following steps:
s1: when the D2D discovery terminal and the D2D terminal respectively search a shared network for a first SIM (Subscriber Identity Module Card) and a second SIM belonging to different operators according to a preset network search strategy and reside in the same shared network cell, acquiring a first time-frequency resource position of the shared network cell;
s2: acquiring 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 to-be-discovered terminal identification information;
s3: and sending a D2D direct communication invitation to the D2D terminal to be found according to the identification information of the D2D terminal to be found and the identification information of the D2D terminal to be found.
D2D communication refers to a communication method in which two peer user nodes communicate directly with each other. Compared with other direct connection technologies which do not depend on infrastructure network infrastructure, the D2D is more flexible, can be connected under the control of a base station, and can also carry out information interaction when no network infrastructure exists.
The D2D discovery terminal and the D2D to-be-discovered terminal are communication terminals capable of being inserted with SIM cards, such as mobile phones, tablet computers and the like.
The SIM card is a subscriber identity card of a digital cellular mobile telephone for a network subscriber to connect to a mobile network. The mobile phone or the card-inserting type tablet computer can search the mobile network by inserting the SIM card and reside in the mobile network, and one SIM card uniquely identifies one client. A plurality of PLMNs are provided in the SIM card, where a PLMN is an identifier of a Mobile communication Network, and each PLMN includes MCC (Mobile country Code) and MNC (Mobile Network Code), so that PLMNs of each Mobile communication operator are different.
The shared network refers to a mobile cellular network which is jointly constructed and used by at least two operators; for example, the shared network is a shared and co-established 5G (5th generation mobile communication technology) NSA (Non-Standalone networking)/SA (Standalone networking) access network, where a coverage area of the 5G network is reduced due to a high communication rate of the 5G network, and in order to reduce a construction cost of the 5G network, the shared network is constructed by at least two operators by co-constructing and commonly using the same mobile cellular network.
The shared network cell is an effective range of the shared network in a certain area. Since the shared network is implemented by a plurality of base stations to realize range coverage, one base station can generate at least one shared network cell, and names or parameters of different shared network cells are different.
The first time-frequency resource location refers to a time domain and a frequency domain allocated to the shared network cell by the base station for communication.
Compared with the prior art, in the D2D communication discovery method, when the D2D discovery terminal and the D2D to-be-discovered terminal respectively perform shared network search on a first SIM card and a second SIM card belonging to different operators according to a preset network search policy and reside in the same shared network cell, the D2D discovery terminal acquires a D2D discovery signal sent by the D2D to-be-discovered terminal in the same time-frequency resource position, and then the D2D discovery terminal and the D2D to perform direct communication connection, so that D2D communication discovery and connection between the SIM cards belonging to different operators are realized.
In one possible embodiment, the process of the D2D discovery terminal and the D2D terminal to be discovered respectively performing shared network search on a first SIM card and a second SIM card belonging to different operators according to a preset network search policy and camping on the same shared network cell includes the following steps:
the D2D discovery terminal searches the shared network according to a first PLMN list preset by the first SIM card, and if the shared network is searched, the shared network resides; otherwise, searching the shared network according to a second PLMN list preset by the first SIM card, and if the shared network is searched, residing the shared network;
wherein the first PLMN list is used for storing PLMNs of a non-home operator shared network; the second PLMN list is used to store PLMNs of the home operator shared network.
The PLMN of the non-home operator shared network is a PLMN shared by other operators and used for residing in the shared network, and the PLMN of the home operator shared network is a PLMN set by a SIM card home operator and used for residing in the shared network. Since the shared network is constructed and used by at least two operators together, the number of PLMNs shared by other operators for residing in the shared network is greater than the number of PLMNs set by the SIM card home operator for residing in the shared network, and therefore, firstly, searching for the shared network according to the first PLMN list can improve the efficiency of successfully searching for the shared network by the D2D discovery terminal.
In a possible embodiment, the process of the D2D discovery terminal and the D2D discovery terminal respectively performing shared network search on a first SIM card and a second SIM card belonging to different operators according to a preset network search policy and camping on the same shared network cell further includes the following steps;
the D2D terminal to be found searches the shared network according to a first PLMN list preset by the second SIM card, and if the shared network is searched, the terminal to be found resides in the shared network; otherwise, searching the shared network according to a second PLMN list preset by the second SIM card, and if the shared network is searched, residing the shared network.
Since the types of SIM cards covered by the non-home operator shared network are more than those of the home operator shared network, firstly searching the shared network according to the first PLMN list can improve the efficiency of successfully searching the shared network by the D2D terminal to be discovered.
In one possible embodiment, when the D2D discovery terminal cannot search the shared network according to the second PLMN list preset by the first SIM card, the D2D discovery terminal blindly detects the D2D discovery signal in the full frequency band.
The blind detection means that the D2D discovery terminal knows that the D2D discovery signal needs to be expected, but does not know the specific position of the D2D discovery signal, and can only search one by one in a full frequency band, but the search efficiency is low, but the D2D discovery terminal can still search the D2D discovery signal when the D2D discovery terminal cannot camp on the shared network by means of the full frequency band blind detection.
In one possible embodiment, when the D2D terminal cannot search the shared network according to the second PLMN list preset by the second SIM card, the D2D terminal blindly transmits the D2D discovery signal in the full frequency band. Through a full-frequency-band blind transmission mode, the D2D terminal to be discovered can send out the D2D discovery signal when the terminal does not reside in the shared network.
The blind sending may be that the D2D terminal to be found sends the D2D discovery signal in any certain frequency band, or sends the D2D discovery signal in different frequency bands according to a set sending period, preferably, the period of the blind detection is not equal to the period of the blind sending, so as to avoid that the periods are equal and therefore the terminals are not in the same frequency band for a long time.
An embodiment of the present invention further provides a discovery system for D2D communication, including: the system comprises a first time-frequency resource acquisition module 1, a D2D discovery signal acquisition module 2 and a direct connection communication invitation module 3;
the first time-frequency resource obtaining module 1 is configured to obtain a first time-frequency resource location of a shared network cell when the D2D discovery terminal and the D2D terminal to be discovered respectively search for shared networks of a first SIM card and a second SIM card belonging to different operators according to a preset network search policy and reside in the same shared network cell;
the D2D discovery signal acquiring module 2 is configured to acquire a D2D discovery signal sent by the D2D terminal to be discovered at the first time-frequency resource location; the D2D discovery signal includes D2D to-be-discovered terminal identification information;
the direct communication invitation module 3 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 terminal identification information to be discovered.
The D2D discovery terminal and the D2D to-be-discovered terminal are communication terminals capable of being inserted with SIM cards, such as mobile phones, tablet computers and the like.
The SIM card is the subscriber identity card of a digital cellular mobile telephone, used for the network subscriber to connect to the mobile network. The mobile phone or the card-inserting type tablet computer can search the mobile network by inserting the SIM card and reside in the mobile network, and one SIM card uniquely identifies one client. A plurality of PLMNs are provided in the SIM card, where a PLMN is an identifier of a Mobile communication Network, and each PLMN includes MCC (Mobile country Code) and MNC (Mobile Network Code), so that PLMNs of each Mobile communication operator are different.
The shared network refers to a mobile cellular network which is jointly constructed and used by at least two operators; for example, an access network sharing a co-established 5G (5th generation mobile communication technology) NSA (Non-standard networking)/SA (standard networking), wherein a coverage area of the 5G network is reduced due to a high communication rate of the 5G network, and in order to reduce a construction cost of the 5G network, the shared network is constructed in a manner that at least two operators jointly construct and commonly use the same mobile cellular network.
The shared network cell is an effective range of the shared network in a certain area. Since the shared network is implemented by a plurality of base stations, one base station can generate at least one shared network cell, and the names or parameters of different shared network cells are different.
The first time-frequency resource location refers to a time domain and a frequency domain allocated to the shared network cell by the base station for communication.
Compared with the prior art, when the D2D discovery terminal and the D2D to-be-discovered terminal 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 policy and reside in the same shared network cell, the D2D discovery terminal obtains a D2D discovery signal sent by the D2D to-be-discovered terminal in the same time-frequency resource position, and then the D2D discovery terminal and the D2D to-be-discovered terminal are in direct connection communication, so that D2D communication discovery and connection between the SIM cards belonging to different operators are achieved.
In a possible embodiment, the system further includes a first residing network module, where the first residing network module is configured to search for the shared network in a first PLMN list preset according to the first SIM card, and if the shared network is searched, reside the shared network; otherwise, searching the shared network according to a second PLMN list preset by the first SIM card, and if the shared network is searched, residing the shared network;
wherein the first PLMN list is used for storing PLMNs of a non-home operator shared network; the second PLMN list is used to store PLMNs of the home operator shared network.
The PLMN of the non-home operator shared network is a PLMN shared by other operators and used for residing in the shared network, and the PLMN of the home operator shared network is a PLMN set by a SIM card home operator and used for residing in the shared network. Since the shared network is constructed and commonly used by at least two operators, the number of PLMNs used for residing in the shared network shared by other operators is greater than that set by the SIM card home operator, and therefore, searching the shared network according to the first PLMN list can improve the efficiency of successfully searching the shared network by the D2D discovery terminal.
In a possible embodiment, the system further includes a second network residing module, where the second network residing module is configured to search the shared network according to a first PLMN list preset by the second SIM card, and if the shared network is searched, reside the shared network; otherwise, searching the shared network according to a second PLMN list preset by the second SIM card, and if the shared network is searched, residing the shared network.
Since the types of SIM cards covered by the non-home operator shared network are more than those of the home operator shared network, firstly searching the shared network according to the first PLMN list can improve the efficiency of successfully searching the shared network by the D2D terminal to be discovered.
An embodiment of the present invention also provides a computer readable storage medium, which stores a computer program that, when executed by a processor, implements the steps of the discovery method of D2D communication described above.
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, wherein the processor implements the steps of the discovery method of D2D communication as described above when executing the computer program.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A method of discovering D2D communication, comprising the steps of:
when the D2D discovery terminal and the D2D terminal to be discovered respectively search shared networks for a first SIM card and a second SIM card belonging to different operators according to a preset network search strategy and reside in the same shared network cell, acquiring a first time-frequency resource position of the shared network cell;
acquiring 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 to-be-discovered terminal identification information;
and sending a D2D direct communication invitation to the D2D terminal to be found according to the identification information of the D2D terminal to be found and the identification information of the D2D terminal to be found.
2. The method of discovery of D2D communication according to claim 1, wherein: the process that the D2D discovery terminal and the D2D terminal to be discovered respectively search the shared network of the first SIM card and the second SIM card belonging to different operators according to a preset network search strategy and reside in the same shared network cell comprises the following steps:
the D2D discovery terminal searches the shared network according to a first PLMN list preset by the first SIM card, and if the shared network is searched, the shared network resides; otherwise, searching the shared network according to a second PLMN list preset by the first SIM card, and if the shared network is searched, residing the shared network;
wherein the first PLMN list is used for storing PLMNs of a non-home operator shared network; the second PLMN list is used to store PLMNs of the home operator shared network.
3. The discovery method of D2D communication according to claim 2, wherein the process of the D2D discovery terminal and the D2D terminal to be discovered respectively performing shared network search for a first SIM card and a second SIM card belonging to different operators according to a preset network search policy and camping on the same shared network cell further comprises the following steps;
the D2D terminal to be found searches the shared network according to a first PLMN list preset by the second SIM card, and if the shared network is searched, the terminal to be found resides in the shared network; otherwise, searching the shared network according to a second PLMN list preset by the second SIM card, and if the shared network is searched, residing the shared network.
4. The method of discovery of D2D communication according to claim 3, wherein: when the D2D discovery terminal cannot search the shared network according to the second PLMN list preset by the first SIM card, the D2D discovery terminal blindly detects the D2D discovery signal in the full frequency band.
5. The method of discovery of D2D communication according to claim 4, wherein: when the D2D terminal to be discovered can not search the shared network according to a second PLMN list preset by the second SIM card, the D2D terminal to be discovered blindly transmits the D2D discovery signal in the full frequency band.
6. A discovery system for D2D communication, comprising: the system comprises a first time-frequency resource acquisition module, a D2D discovery signal acquisition module and a direct connection communication invitation module;
the first time-frequency resource acquisition module is configured to acquire a first time-frequency resource location of a shared network cell when the D2D discovery terminal and the D2D terminal to be discovered respectively search for shared networks of first SIM cards and second SIM cards belonging to different operators according to a preset network search policy and reside in the same shared network cell;
the D2D discovery signal acquiring module is configured to acquire a D2D discovery signal transmitted by the D2D terminal to be discovered in the first time-frequency resource location; the D2D discovery signal includes D2D to-be-discovered terminal identification information;
the direct connection communication invitation module is used for sending a D2D direct connection communication invitation to the D2D terminal to be found according to the identification information of the D2D terminal to be found and the identification information of the D2D terminal to be found.
7. The discovery system of D2D communication according to claim 6, wherein: the first resident network module is used for searching the shared network according to a first PLMN list preset by the first SIM card, and if the shared network is searched, the first resident network module resides in the shared network; otherwise, searching the shared network according to a second PLMN list preset by the first SIM card, and if the shared network is searched, residing the shared network;
wherein the first PLMN list is used for storing PLMNs of a non-home operator shared network; the second PLMN list is used to store PLMNs of the home operator shared network.
8. The discovery system of D2D communication according to claim 7, wherein: the second resident network module is used for searching the shared network according to a first PLMN list preset by the second SIM card, and if the shared network is searched, the shared network is resident; otherwise, searching the shared network according to a second PLMN list preset by the second SIM card, and if the shared network is searched, residing the shared network.
9. A computer-readable storage medium storing a computer program, characterized in that: the computer program when executed by a processor implementing the steps of the method according to any one of claims 1 to 5.
10. A computer device, characterized by: comprising a memory, a processor and a computer program stored in said memory and executable by said processor, said processor implementing the steps of the method according to any of the claims 1-5 when executing said computer program.
CN202110326380.8A 2021-03-26 2021-03-26 Discovery method and discovery system for D2D communication Pending CN115134814A (en)

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