CN110072214B - Method and device for discovering applications in device-to-device D2D communication - Google Patents
Method and device for discovering applications in device-to-device D2D communication Download PDFInfo
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- CN110072214B CN110072214B CN201711052303.8A CN201711052303A CN110072214B CN 110072214 B CN110072214 B CN 110072214B CN 201711052303 A CN201711052303 A CN 201711052303A CN 110072214 B CN110072214 B CN 110072214B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a method and a device for discovering applications in D2D communication, wherein an access centralized controller receives a D2D communication application discovery request message sent by a mobile device, determines a mobile device identification number of the mobile device according to the device number of the mobile device, determines a mobile device identification number of a first device according to the application identification number and the position of the mobile device, generates a corresponding relation among the mobile device identification number of the mobile device, the mobile device identification number of the first device and the application identification number, and finally broadcasts an application discovery broadcast message to a cell where the mobile device is located. The access centralized controller determines the correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number, so that the mobile device actively discovers the mobile device which has the same application and can perform D2D communication, and can automatically initiate D2D communication without a base station or the access centralized controller establishing a D2D connection.
Description
Technical Field
The embodiment of the invention relates to the technical field of wireless communication, in particular to a method and a Device for discovering applications in Device-to-Device (D2D) communication.
Background
The 5G communication system provides a realization target for improving the frequency spectrum utilization rate, reducing the time delay, improving the user experience rate and the like, and the D2D communication technology is a direct communication technology among devices and realizes the communication among the devices on the basis of the support of a mobile system. D2D communication can effectual utilization short-range direct channel communicate to promote the user experience speed between the equipment and reduce end-to-end time delay, can shunt base station data volume and promote whole spectrum utilization efficiency moreover. The D2D communication technology is still in the process of development, for example, the D2D discovery technology, how to allocate spectrum resources to reduce communication interference, the handover problem of D2D communication, etc. are still in the process of research and improvement. Since D2D communication mainly enables direct communication of devices in close proximity, direct device communication first addresses the problem of how to discover devices that can communicate directly, while direct communication between initiating devices is application-driven and not all devices need to communicate directly.
A related approach is the setup approach of the D2D session. In a System Architecture Evolution (SAE) Architecture, Serving PDN Gateway knows the terminal global IP address, and can monitor the D2D data stream, because the Serving Gateway needs to process the IP header and tunnel indicator of each data, it knows which base station (eNodeB) each User Equipment (UE) is under control. When the source end and the destination end of a certain data packet are found to be in the range of the same eNodeB or in the range of adjacent eNodeBs, the data packets are considered to be possible D2D data streams, then the channel measurement between the UEs is carried out, and when the channel quality is good enough, the D2D connection can be established under the control of the eNodeB.
Even if the D2D connection is successfully established, the eNodeB is still responsible for cellular and D2D resource allocation, and the UE can continue to maintain connectivity to the internet. By listening to the IP data stream from the device that is closer to the network to establish the D2D connection, the user does not need to specifically initiate a D2D session request and will automatically select between the cellular connection and the D2D connection by the network.
In the current D2D scheme, the devices do not have active D2D communication discovery capability, but passively analyze the addresses of the data packets to discover whether the proximity exists, thereby controlling the establishment of direct communication between the devices.
Disclosure of Invention
The embodiment of the invention provides a method and a device for discovering applications in D2D communication, which are used for realizing that a mobile device actively initiates D2D communication.
The method for application discovery in D2D communication provided by the embodiment of the invention comprises the following steps:
an access centralized controller receives a D2D communication application discovery request message sent by a mobile device, wherein the D2D communication application discovery request message comprises a device number and an application identification number of the mobile device;
the access centralized controller determines the mobile equipment identification number of the mobile equipment according to the equipment number of the mobile equipment;
the access centralized controller determines the equipment identification number of the first equipment according to the application identification number and the position of the mobile equipment, and generates a corresponding relation among the mobile equipment identification number of the mobile equipment, the equipment identification number of the first equipment and the application identification number;
the access centralized controller broadcasts an application discovery broadcast message to a cell where the mobile device is located, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a device identification number of the first device, and a correspondence relationship between the application identification numbers.
Optionally, before receiving the D2D communication application discovery request message sent by the mobile device, the access centralized controller further includes:
the access centralized controller establishes a discovery information list, an equipment identification number distribution list and a control layer discovery application list;
the access centralized controller determines the mobile equipment identification number of the mobile equipment according to the equipment number of the mobile equipment, and the method comprises the following steps:
the access centralized controller judges whether to store the mobile equipment identification number of the mobile equipment according to the equipment number of the mobile equipment; if so, determining the mobile equipment identification number of the mobile equipment; if not, distributing the mobile equipment identification number of the mobile equipment to the mobile equipment, writing the equipment identification number of the mobile equipment into the equipment identification number distribution table, extracting the base station identification number of the base station to which the mobile equipment belongs and the position identification number of the mobile equipment, and writing the base station identification number and the position identification number into the discovery information list.
Optionally, after allocating the mobile device identification number of the mobile device to the mobile device, the access centralized controller further includes:
and the access centralized controller sends the mobile equipment identification number of the mobile equipment to the mobile equipment.
Optionally, after the access centralized controller generates the correspondence between the mobile device identification number of the mobile device, the device identification number of the first device, and the application identification number, the access centralized controller further includes:
and the access centralized controller writes the corresponding relation among the mobile equipment identification number of the mobile equipment, the equipment identification number of the first equipment and the application identification number into the control layer discovery application list.
Optionally, the method further includes:
the access centralized controller receives an application update message sent by the mobile equipment;
and the access centralized controller updates the application identification number in the control layer discovery application list according to the application updating message.
Optionally, the determining, by the access centralized controller, the device identification number of the first device according to the application identification number and the location of the mobile device includes:
the access centralized controller determines all mobile equipment with the application identification number according to the application identification number;
the access centralized controller determines mobile equipment of which the distance to the mobile equipment conforms to the direct communication distance from all the mobile equipment with the application identification number according to the position of the mobile equipment;
and the access centralized controller determines the mobile equipment identification number of the mobile equipment of which the distance from the access centralized controller to the mobile equipment conforms to the direct communication distance as the mobile equipment identification number of the first equipment.
Correspondingly, the embodiment of the invention also provides a method for discovering applications in D2D communication, which comprises the following steps:
the method comprises the steps that the mobile equipment receives an application discovery broadcast message broadcasted by an access centralized controller, wherein the application discovery broadcast message comprises a mobile equipment identification number of the mobile equipment, a mobile equipment identification number of first equipment and a corresponding relation of application identification numbers; the first equipment is mobile equipment of which the distance to the mobile equipment conforms to the direct communication distance;
the mobile equipment determines the mobile equipment identification number of the first equipment with the same application identification number according to the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the corresponding relation of the application identification numbers;
the mobile device communicates with the first device in D2D based on the mobile device identification number of the first device.
Optionally, before receiving the application discovery broadcast message broadcast by the access centralized controller, the mobile device further includes:
the mobile device sends a D2D communication application discovery request message to the access centralized controller, wherein the D2D communication application discovery request message comprises the device number and the application identification number of the mobile device.
Optionally, before sending the D2D communication application discovery request message to the access centralized controller, the mobile device further includes:
the mobile equipment establishes an equipment end discovery application list;
after receiving the broadcast message broadcast by the access centralized controller, the mobile device further includes:
and the mobile equipment writes the corresponding relation among the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the application identification number into the equipment end discovery application list.
Optionally, the method further includes:
and when the mobile equipment determines that the application identification number changes, the mobile equipment broadcasts the updated application identification number in the cell.
Correspondingly, an embodiment of the present invention further provides an apparatus for application discovery in D2D communication, including:
a receiving module, configured to receive a D2D communication application discovery request message sent by a mobile device, where the D2D communication application discovery request message includes a device number and an application identification number of the mobile device;
a determining module, configured to determine a mobile device identification number of the mobile device according to the device number of the mobile device; determining the equipment identification number of the first equipment according to the application identification number and the position of the mobile equipment, and generating the corresponding relation among the mobile equipment identification number of the mobile equipment, the equipment identification number of the first equipment and the application identification number;
a sending module, configured to broadcast an application discovery broadcast message to a cell in which the mobile device is located, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a device identification number of the first device, and a correspondence relationship between the application identification numbers.
Optionally, the method further includes the establishing module:
the establishing module is used for establishing a discovery information list, an equipment identification number distribution list and a control layer discovery application list;
the determining module is specifically configured to:
judging whether to store the mobile equipment identification number of the mobile equipment or not according to the equipment number of the mobile equipment; if so, determining the mobile equipment identification number of the mobile equipment; if not, distributing the mobile equipment identification number of the mobile equipment to the mobile equipment, writing the equipment identification number of the mobile equipment into the equipment identification number distribution table, extracting the base station identification number of the base station to which the mobile equipment belongs and the position identification number of the mobile equipment, and writing the base station identification number and the position identification number into the discovery information list.
Optionally, after allocating the mobile device identification number of the mobile device to the mobile device, the sending module is further configured to send the mobile device identification number of the mobile device to the mobile device.
Optionally, after generating the corresponding relationship between the mobile device identification number of the mobile device, the device identification number of the first device, and the application identification number, the determining module is further configured to write the corresponding relationship between the mobile device identification number of the mobile device, the device identification number of the first device, and the application identification number into the control layer discovery application list.
Optionally, the receiving module is further configured to receive an application update message sent by the mobile device;
the determining module is further configured to update the application identification number in the control layer discovery application list according to the application update message.
Optionally, the determining module is specifically configured to:
the access centralized controller determines all mobile equipment with the application identification number according to the application identification number;
the access centralized controller determines mobile equipment of which the distance to the mobile equipment conforms to the direct communication distance from all the mobile equipment with the application identification number according to the position of the mobile equipment;
and the access centralized controller determines the mobile equipment identification number of the mobile equipment of which the distance from the access centralized controller to the mobile equipment conforms to the direct communication distance as the mobile equipment identification number of the first equipment.
Correspondingly, an embodiment of the present invention further provides an apparatus for application discovery in D2D communication, including:
a receiving module, configured to receive an application discovery broadcast message broadcasted by an access centralized controller, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a mobile device identification number of the first device, and a correspondence relationship between the application identification numbers; the first equipment is mobile equipment of which the distance to the mobile equipment conforms to the direct communication distance;
the determining module is used for determining the mobile equipment identification number of the first equipment with the same application identification number according to the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the corresponding relation of the application identification numbers;
and the communication module is used for carrying out D2D communication with the first equipment according to the mobile equipment identification number of the first equipment.
Optionally, the system further comprises a sending module;
the sending module is configured to send a D2D communication application discovery request message to the access centralized controller before receiving the application discovery broadcast message broadcast by the access centralized controller, where the D2D communication application discovery request message includes a device number and an application identification number of the mobile device.
Optionally, the system further comprises an establishing module;
the establishing module is configured to establish a device discovery application list before sending the D2D communication application discovery request message to the access centralized controller;
the determining module is further configured to write, after receiving the broadcast message broadcast by the access centralized controller, a correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number into the device discovery application list.
Optionally, the sending module is further configured to:
and broadcasting the updated application identification number in the cell when the application identification number is determined to be changed.
Accordingly, embodiments of the present invention also provide a computer-readable storage medium, which includes computer-readable instructions, and when the computer-readable instructions are read and executed by a computer, the computer is enabled to execute the method for application discovery in D2D communication.
Accordingly, the embodiment of the present invention also provides a computer program product, which when read and executed by a computer, causes the computer to execute the method for application discovery in D2D communication.
The embodiment of the invention shows that an access centralized controller receives a D2D communication application discovery request message sent by a mobile device, determines a mobile device identification number of the mobile device according to the device number of the mobile device, determines a mobile device identification number of a first device according to the application identification number and the position of the mobile device, generates a corresponding relation among the mobile device identification number of the mobile device, the mobile device identification number of the first device and the application identification number, and finally broadcasts an application discovery broadcast message to a cell where the mobile device is located. The access centralized controller determines the correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number, so that the mobile device actively discovers the mobile device which has the same application and can perform D2D communication, and can automatically initiate D2D communication without a base station or the access centralized controller establishing a D2D connection.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a structure of a communication system according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of an application discovery method in D2D communication according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a base station according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an identifier of a dispensing device according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating an application discovery method in D2D communication according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating an application update according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating an update of a mobile device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an application discovery apparatus in D2D communication according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an application discovery apparatus in D2D communication according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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.
Fig. 1 exemplarily shows a structure of a communication system to which the method for discovering an application in D2D communication provided by the embodiment of the present invention is applied, where the communication system includes an access centralized controller 101, a plurality of mobile devices 102, and a plurality of base stations 103.
The mobile device 102 may be a device with wireless transceiving function and capable of running relevant mobile applications, and may be deployed on land, including indoors or outdoors, hand-held, worn or in a vehicle; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The mobile device 102 may be a mobile phone (mobile phone), an internet of things (IoT) terminal device, a tablet computer (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and so on. The embodiments of the present application do not limit the application scenarios. The mobile device 102 may also be sometimes referred to as a User Equipment (UE), an access terminal device, a UE unit, a UE station, a mobile station, a distant station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE apparatus, etc.
The base station 103 may be a device that accesses the mobile device 102 to a wireless network, including but not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B or home Node B, HNB), a Base Band Unit (BBU), a base station (g nodeB, gbb), a transmission point (TRP), a Transmission Point (TP), a mobile switching center, etc., and further, a wifi Access Point (AP), etc. may be included.
The access centralized controller 101 may be an entity that implements resource system management in a 5G mobile communication network, and may implement a cooperation function between base stations. The access centralized controller 101 is deployed according to a 5G mobile communication network control architecture, and may be located in the base station 103 or in a control cloud of the 5G mobile communication network.
In order to support the method for discovering the application in the D2D communication provided by the embodiment of the present invention, the entity structure further includes a specific function module.
The mobile device 102 includes: a 5G communication module, a D2D communication application discovery module; the 5G communication module supports the communication function in the 5G mobile communication network and realizes the processing function of a wireless communication channel; the D2D communication application discovery module realizes the functions of maintaining information lists such as device location information and application information of the mobile device, updating information, and the like.
The base station 103 implements communication channel management, implementing mobile device access and data forwarding functions.
The access centralized controller 101 includes: D2D communication application discovery module and cooperative function module; the D2D communication application discovery module implements application discovery on the mobile device 102 in the centralized control base station 103, including the kinetic energy of creating, updating, deleting, etc. of the mobile device location information and the application information; the cooperative function module is mainly used for realizing cooperative management among multiple base stations based on various resources and user information, such as allocation of frequency spectrum resources.
Based on the foregoing description, fig. 2 exemplarily illustrates a flow of a method for discovering an application in D2D communication according to an embodiment of the present invention, where the flow may be performed by an apparatus for discovering an application in D2D communication, and the apparatus may be located in the access centralized controller or may be the access centralized controller.
As shown in fig. 2, the process specifically includes:
step S201, the access centralized controller receives a D2D communication application discovery request message sent by the mobile device.
Specifically, when the mobile device actively initiates an application discovery request, the D2D communication application discovery request message is sent to the access centralized controller, where the D2D communication application discovery request message includes that the D2D communication application discovery request message includes a device number and an application identification number of the mobile device. Optionally, if the mobile device wishes to use multiple applications for communication, the D2D communication application discovery request message may further include a D2D communication application discovery request message type number, an application identification number 1, a supposed identification number 2, … …, an application identification number n, a message trailer, etc. The application identification number is calculated by the hash function of the application name running in the mobile device. The D2D communication application discovery request message type number may be as shown in table 1.
TABLE 1
| D2D communication application discovery request message | 100 |
| Broadcasting related discovery service record messages | 200 |
| Mobile device identification number assignment message | 300 |
| Mobile device application update messages | 400 |
| Mobile device change messages | 500 |
In order to better implement the procedure of application discovery in D2D communication, the access centralized controller needs to establish a discovery information list, a device identification number allocation table, and a control layer discovery application list before receiving a D2D communication application discovery request message sent by a mobile device.
Wherein the discovery information list may include: mobile device identification number, base station identification number, location identification number, application name, valid bit, and the like. The mobile equipment identification number is a temporary identification number which is distributed to the mobile equipment by the access centralized controller and corresponds to the equipment number of the mobile equipment; the base station identification number is an identification number allocated to a base station in a 5G mobile communication network; the position identification number is a mark number of each block after the signal coverage range of each base station is divided into blocks in advance; the application identification number is a label assigned to each application; the valid bit indicates whether a record is valid, 1 indicates valid, 0 indicates invalid, and invalid records are deleted periodically.
The device identification number allocation table may include: the device number of the mobile device, the mobile device identification number, and the like. The device number of the mobile device is the unique identification number of the device. The location table may include: base station identification number, location signal information. The location table is defined by the access centralized controller and does not need to be updated unless the base station deployment changes. As shown in fig. 3.
The control layer discovery application list may include: mobile device identification number 1, mobile device identification number 2, application identification number, valid bit, and the like. The table is initialized as an empty table, and after performing the application discovery process, records with the same application are generated that meet the D2D communication distance requirements. Wherein mobile device identification number 1, mobile device identification number 2, and application identification number 1 record mobile devices having the same application.
Step S202, the access centralized controller determines the mobile equipment identification number of the mobile equipment according to the equipment number of the mobile equipment.
After receiving the D2D communication application discovery request message, the access centralized controller needs to determine the mobile device identification number of the mobile device according to the device number of the mobile device. Specifically, the access centralized controller determines whether the mobile device identification number of the mobile device is stored according to the device number of the mobile device. If the mobile device identification number of the mobile device is stored, the discovery information list may be queried to obtain the mobile device identification number of the mobile device. If the device identification number is not stored, the access centralized controller needs to allocate the mobile device identification number of the mobile device to the mobile device, and writes the device identification number of the mobile device into the device identification number allocation table. Then, the base station identification number of the base station to which the mobile equipment belongs is extracted from the system, the position identification number of the mobile equipment is inquired from the position table, and the base station identification number and the position identification number are written into the discovery information list. The mobile device identification number is a temporary identification number allocated to the mobile device by the access centralized controller, so that management is facilitated. And the device number of the mobile device is the unique identification number of the mobile device.
Optionally, after allocating the mobile device identification number to the mobile device, the access centralized controller simultaneously sends a mobile device identification number allocation message to the mobile device initiating the D2D communication application discovery request message, where the message includes: the mobile device identification number is assigned a message type number and a mobile device identification number, as shown in fig. 4. The mobile device identification number assignment message type number can be shown in table 1.
Step S203, the access centralized controller determines the equipment identification number of the first equipment according to the application identification number and the position of the mobile equipment, and generates the corresponding relation among the mobile equipment identification number of the mobile equipment, the equipment identification number of the first equipment and the application identification number.
Specifically, the access centralized controller may determine all mobile devices having the application identification number according to the application identification number. For example, table 2 shows that the application identification number of the application run by the mobile device that initiates the D2D communication application discovery request message is 3 for all mobile devices managed by the access centralized controller, and the mobile device identification numbers of all mobile devices running the application with the application identification number of 3 can be determined from the table.
TABLE 2
| Mobile device identification number | Application identification number |
| 1 | 1、2、3、5、9、11 |
| 2 | 3、4、9、11 |
| 3 | 5、7、11、22、 |
| 4 | 1、3、5、8、9 |
| … | … |
And then the access centralized controller determines the mobile equipment of which the distance to the mobile equipment accords with the direct communication distance from all the mobile equipment with the application identification number according to the position of the mobile equipment. That is to say, the physical distance between the mobile device and the other mobile devices having the application identification number is required to conform to a direct communication distance, and the direct communication distance may be set according to experience, which is not limited in the embodiment of the present invention. The access centralized controller may determine the mobile device identification number of the mobile device whose distance from the mobile device corresponds to the direct communication distance as the mobile device identification number of the first device. That is, the first device is a mobile device whose distance from the mobile device corresponds to a direct communication distance. Then, a corresponding relationship between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number is generated, and the corresponding relationship may exist in a form of a table, that is, after the corresponding relationship between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number is generated, the access centralized controller writes the corresponding relationship between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number into the control layer discovery application list.
Step S204, the access centralized controller broadcasts an application discovery broadcast message to the cell in which the mobile device is located, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a correspondence between the mobile device identification number of the first device and the application identification number.
After obtaining the correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number, the access centralized controller needs to broadcast an application discovery broadcast message to the cell in which the mobile device is located, where the application discovery broadcast message includes the correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number. The mobile device receiving the application discovery broadcast message may be caused to determine a mobile device which is required by itself and can perform D2D communication, and perform D2D communication.
Optionally, after the application running on the mobile device is updated, the mobile device needs to send an application update message to the access centralized controller, where the application update message includes an updated application identification number, and the access centralized controller updates the application identification number of the control layer discovery application list according to the updated application identification number.
The foregoing embodiment shows that the access centralized controller receives a D2D communication application discovery request message sent by a mobile device, determines a mobile device identification number of the mobile device according to a device number of the mobile device, determines a mobile device identification number of a first device according to the application identification number and a location of the mobile device, generates a correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number, and finally broadcasts an application discovery broadcast message to a cell in which the mobile device is located, where the application discovery broadcast message includes the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the correspondence between the application identification numbers. The access centralized controller obtains the mobile device identification number of the mobile device, the mobile device identification number of the first device and the corresponding relation of the application identification number and the mobile device identification number of the mobile device according to the mobile device identification number and the application identification number of the mobile device, so that the mobile device can actively discover the mobile device which has the same application and can perform D2D communication, and the D2D communication can be initiated by itself without the base station or the access centralized controller establishing D2D connection.
Based on the same technical concept, fig. 5 exemplarily shows a flow of a method for application discovery in D2D communication, which may be performed by an apparatus for application discovery in D2D communication, which may be located in or be a mobile device.
As shown in fig. 5, the specific steps of the process include:
step S501, the mobile device receives an application discovery broadcast message broadcasted by the access centralized controller, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a mobile device identification number of the first device, and a corresponding relationship of the application identification numbers.
Specifically, in the embodiment of the present invention, the first device is a mobile device whose distance from the mobile device conforms to a direct communication distance. Before receiving the application discovery broadcast message broadcast by the access centralized controller, the mobile device further needs to send a D2D communication application discovery request message to the access centralized controller, where the D2D communication application discovery request message includes a device number and an application identification number of the mobile device, and optionally, if the mobile device wishes to use multiple applications for communication, the D2D communication application discovery request message may further include a D2D communication application discovery request message type number, an application identification number 1, a supposed identification number 2, … …, an application identification number n, a message tail, and the like. The application identification number is calculated by the hash function of the application name running in the mobile device.
Before sending the D2D communication application discovery request message, in order to be able to perform the application discovery procedure, a device-side discovery application list needs to be established. The device discovery application list may include: mobile device identification number, application identification number, valid bit, etc. After receiving the application discovery broadcast message broadcast by the access centralized controller, the mobile device also needs to write the correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number into the device discovery application list.
Step S502, the mobile device determines the mobile device identification number of the first device with the same application identification number according to the mobile device identification number of the mobile device, the mobile device identification number of the first device and the corresponding relation of the application identification numbers.
The mobile device finds the application list according to the device side, the mobile device can find a certain application which is the same as the mobile device, and can perform D2D communication, and the mobile device determines the mobile device identification number of the first device with the same application identification number.
Step S503, the mobile device performs D2D communication with the first device according to the mobile device identification number of the first device.
After obtaining the mobile device identification number of the first device with the same application identification number, the mobile device may establish a D2D connection with the first device to perform D2D communication.
Optionally, after the application on the mobile device changes, the mobile device broadcasts a mobile device application update message, which may be received by other mobile devices and the access centralized controller; other mobile devices and the access centralized controller update the discovery application list thereof according to the message; the message includes: the mobile equipment application updating message type number, the mobile equipment identification number, the application identification number and the processing type mark; when the value of the processing type mark is 1, the application is increased; and when the value of the processing type mark is 0, the application is deleted. As shown in fig. 6. The mobile device application update message type number may be as shown in table 1 above.
Optionally, the access centralized controller may periodically check the distance between the mobile devices in the control layer discovery application list according to the location of the mobile device, determine whether the mobile device is within the management range of the mobile device, and further generate and broadcast a mobile device change message; the message includes: the mobile equipment changes the message type number, the mobile equipment identification number and the equipment state number; when the device state number takes a value of 1, the mobile device related record is invalid; and when the value is 0, the mobile equipment related record is deleted. As shown in fig. 7. The mobile device change message type number is shown in table 1.
In the embodiment of the present invention, through the D2D discovery request message and the broadcast discovery service record message, the mobile device and the related records of the application thereof are added to the control layer discovery application list of the access centralized controller and the device side discovery application list of the mobile device, respectively; further, through the recording list, the access centralized controller and the mobile device end can actively discover devices with the same application, for example, the mobile device identification number, the application identification number and the valid bit information extracted from the broadcast discovery service recording message are recorded in the device end discovery application list of the mobile device, so that the access centralized controller and the mobile device end can know applications and devices which can be directly communicated; for the access centralized controller, by querying the control layer to discover the application list, the application use condition on the mobile device and the potential mobile devices and applications capable of D2D communication can be grasped.
In the method for discovering an application in D2D communication based on the device location and list mechanism according to the embodiments of the present invention, a discovery new type list of an access centralized controller, a mobile device identifier assignment table, a location table, a control layer discovery application list, and a device discovery application list in a mobile device are initialized, and a D2D communication application discovery protocol is executed, the access centralized controller sends an assignment message to the mobile device, broadcasts a mobile device application update message, and the access centralized controller broadcasts a mobile device change message, where mobile devices within a management range and situations of applications thereof are recorded in each list of the access centralized controller and the mobile devices, and a mobile terminal capable of performing D2D communication and a use situation of the applications, etc. with the same application can be actively discovered through the information. The application discovery method in the D2D communication based on the device location and list mechanism can simplify and improve the capability of providing support for the D2D communication; the mobile device end can definitely perform the application and the device of D2D communication, so that the processing pressure of the network end is reduced; the access centralized controller records the mobile device and the application thereof in the management range, and sends the potential D2D communication device and application information to the mobile device terminal by combining the position information, thereby improving the application discovery and management capability of D2D communication.
It should be noted that the method for discovering applications in D2D communication based on device location and list mechanism does not relate to the specific D2D communication establishment range. The application discovery method in the D2D communication based on the device location and list mechanism is not limited to the scenario described by the protocol, but is also suitable for access centralized controllers with different management ranges, supports the cooperative work among multiple access centralized controllers, and according to the mobile location prediction of the mobile device, neighboring access centralized controllers share the information of the mobile device to execute the protocol.
Based on the same technical concept, fig. 8 exemplarily shows an apparatus for application discovery in D2D communication, which is further provided by the embodiment of the present invention, and includes:
a receiving module 801, configured to receive a D2D communication application discovery request message sent by a mobile device, where the D2D communication application discovery request message includes a device number and an application identification number of the mobile device;
a determining module 802, configured to determine a mobile device identification number of the mobile device according to the device number of the mobile device; determining the equipment identification number of the first equipment according to the application identification number and the position of the mobile equipment, and generating the corresponding relation among the mobile equipment identification number of the mobile equipment, the equipment identification number of the first equipment and the application identification number;
a sending module 803, configured to broadcast an application discovery broadcast message to a cell in which the mobile device is located, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a device identification number of the first device, and a correspondence relationship between the application identification numbers.
Optionally, the system further comprises a building module (not shown in the figure):
the establishing module is used for establishing a discovery information list, an equipment identification number distribution list and a control layer discovery application list;
the determining module 802 is specifically configured to:
judging whether to store the mobile equipment identification number of the mobile equipment or not according to the equipment number of the mobile equipment; if so, determining the mobile equipment identification number of the mobile equipment; if not, distributing the mobile equipment identification number of the mobile equipment to the mobile equipment, writing the equipment identification number of the mobile equipment into the equipment identification number distribution table, extracting the base station identification number of the base station to which the mobile equipment belongs and the position identification number of the mobile equipment, and writing the base station identification number and the position identification number into the discovery information list.
Optionally, after assigning the mobile device with the mobile device identification number of the mobile device, the sending module 803 is further configured to send the mobile device identification number of the mobile device to the mobile device.
Optionally, after generating the corresponding relationship between the mobile device identification number of the mobile device, the device identification number of the first device, and the application identification number, the determining module 802 is further configured to write the corresponding relationship between the mobile device identification number of the mobile device, the device identification number of the first device, and the application identification number into the control layer discovery application list.
Optionally, the receiving module 801 is further configured to receive an application update message sent by the mobile device;
the determining module 802 is further configured to update the application identification number in the control layer discovery application list according to the application update message.
Optionally, the determining module 802 is specifically configured to:
the access centralized controller determines all mobile equipment with the application identification number according to the application identification number;
the access centralized controller determines mobile equipment of which the distance to the mobile equipment conforms to the direct communication distance from all the mobile equipment with the application identification number according to the position of the mobile equipment;
and the access centralized controller determines the mobile equipment identification number of the mobile equipment of which the distance from the access centralized controller to the mobile equipment conforms to the direct communication distance as the mobile equipment identification number of the first equipment.
Based on the same technical concept, fig. 9 exemplarily shows that the embodiment of the present invention further provides an apparatus for application discovery in D2D communication, including:
a receiving module 901, configured to receive an application discovery broadcast message broadcasted by an access centralized controller, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a mobile device identification number of a first device, and a correspondence between the application identification numbers; the first equipment is mobile equipment of which the distance to the mobile equipment conforms to the direct communication distance;
a determining module 902, configured to determine, according to the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the corresponding relationship between the application identification numbers, the mobile device identification number of the first device, and the mobile device identification number of the first device, the mobile device identification number of the first device having the same application identification number;
a communication module 903, configured to perform D2D communication with the first device according to the mobile device identification number of the first device.
Optionally, a sending module (not shown in the figure) is further included;
the sending module is configured to send a D2D communication application discovery request message to the access centralized controller before receiving the application discovery broadcast message broadcast by the access centralized controller, where the D2D communication application discovery request message includes a device number and an application identification number of the mobile device.
Optionally, a building module (not shown in the figure) is further included;
the establishing module is configured to establish a device discovery application list before sending the D2D communication application discovery request message to the access centralized controller;
the determining module 902 is further configured to, after receiving the broadcast message broadcast by the access centralized controller, write the correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number into the device discovery application list.
Optionally, the sending module is further configured to:
and broadcasting the updated application identification number in the cell when the application identification number is determined to be changed.
Optionally, an embodiment of the present invention further provides a computer-readable storage medium, which includes computer-readable instructions, and when the computer reads and executes the computer-readable instructions, the computer is caused to execute the method for discovering the application in the D2D communication.
Optionally, an embodiment of the present invention further provides a computer program product, which, when being read and executed by a computer, causes the computer to execute the method for application discovery in D2D communication.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (17)
1. A method of application discovery in device-to-device, D2D, communications, comprising:
an access centralized controller receives a D2D communication application discovery request message sent by a mobile device, wherein the D2D communication application discovery request message comprises a device number and an application identification number of the mobile device;
the access centralized controller determines the mobile equipment identification number of the mobile equipment according to the equipment number of the mobile equipment;
the access centralized controller determines all mobile equipment with the application identification number according to the application identification number;
the access centralized controller determines mobile equipment of which the distance to the mobile equipment accords with the direct communication distance from all the mobile equipment with the application identification number according to the position of the mobile equipment;
the access centralized controller determines the mobile equipment identification number of the mobile equipment, the distance between which and the mobile equipment conforms to the direct communication distance, as the mobile equipment identification number of the first equipment, and generates a corresponding relation among the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the application identification number;
the access centralized controller broadcasts an application discovery broadcast message to a cell where the mobile device is located, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a mobile device identification number of the first device, and a correspondence relationship between the application identification numbers.
2. The method of claim 1, wherein the access centralized controller, prior to receiving the D2D communication application discovery request message sent by the mobile device, further comprises:
the access centralized controller establishes a discovery information list, an equipment identification number distribution list and a control layer discovery application list;
the access centralized controller determines the mobile equipment identification number of the mobile equipment according to the equipment number of the mobile equipment, and the method comprises the following steps:
the access centralized controller judges whether to store the mobile equipment identification number of the mobile equipment according to the equipment number of the mobile equipment; if so, determining the mobile equipment identification number of the mobile equipment; if not, distributing the mobile equipment identification number of the mobile equipment to the mobile equipment, writing the equipment identification number of the mobile equipment into the equipment identification number distribution table, extracting the base station identification number of the base station to which the mobile equipment belongs and the position identification number of the mobile equipment, and writing the base station identification number and the position identification number into the discovery information list.
3. The method of claim 2, wherein the access centralized controller, after assigning the mobile device with the mobile device identification number of the mobile device, further comprises:
and the access centralized controller sends the mobile equipment identification number of the mobile equipment to the mobile equipment.
4. The method of claim 2, wherein the accessing centralized controller, after generating the correspondence of the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number, further comprises:
and the access centralized controller writes the corresponding relation among the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the application identification number into the control layer discovery application list.
5. The method of claim 4, wherein the method further comprises:
the access centralized controller receives an application update message sent by the mobile equipment;
and the access centralized controller updates the application identification number in the control layer discovery application list according to the application updating message.
6. A method of application discovery in device-to-device, D2D, communications, comprising:
the method comprises the steps that the mobile equipment receives an application discovery broadcast message broadcasted by an access centralized controller, wherein the application discovery broadcast message comprises a mobile equipment identification number of the mobile equipment, a mobile equipment identification number of first equipment and a corresponding relation of application identification numbers; the first device is a mobile device which has the application identification number and the distance between the first device and the mobile device conforms to the direct communication distance;
the mobile equipment determines the mobile equipment identification number of the first equipment with the same application identification number according to the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the corresponding relation of the application identification numbers;
the mobile device communicates with the first device in D2D based on the mobile device identification number of the first device.
7. The method of claim 6, wherein the mobile device, prior to receiving the broadcast message broadcast by the access centralized controller, further comprises:
the mobile device sends a D2D communication application discovery request message to the access centralized controller, wherein the D2D communication application discovery request message comprises the device number and the application identification number of the mobile device.
8. The method of claim 7, wherein the mobile device, prior to sending the D2D communication application discovery request message to the access centralized controller, further comprises:
the mobile equipment establishes an equipment end discovery application list;
after receiving the application discovery broadcast message broadcast by the access centralized controller, the mobile device further includes:
and the mobile equipment writes the corresponding relation among the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the application identification number into the equipment end discovery application list.
9. The method of any of claims 6 to 8, further comprising:
and when the mobile equipment determines that the application identification number changes, the mobile equipment broadcasts the updated application identification number in the cell.
10. An apparatus for application discovery in device-to-device, D2D, communication, comprising:
a receiving module, configured to receive a D2D communication application discovery request message sent by a mobile device, where the D2D communication application discovery request message includes a device number and an application identification number of the mobile device;
a determining module, configured to determine a mobile device identification number of the mobile device according to the device number of the mobile device; determining all mobile devices with the application identification numbers according to the application identification numbers; determining the mobile equipment of which the distance to the mobile equipment conforms to the direct communication distance from all the mobile equipment with the application identification number according to the position of the mobile equipment; determining the mobile equipment identification number of the mobile equipment, the distance between which and the mobile equipment conforms to the direct communication distance, as the mobile equipment identification number of the first equipment, and generating the corresponding relation among the mobile equipment identification number of the mobile equipment, the equipment identification number of the first equipment and the application identification number;
a sending module, configured to broadcast an application discovery broadcast message to a cell in which the mobile device is located, where the application discovery broadcast message includes a mobile device identification number of the mobile device, a device identification number of the first device, and a correspondence relationship between the application identification numbers.
11. The apparatus of claim 10, further comprising a setup module:
the establishing module is used for establishing a discovery information list, an equipment identification number distribution list and a control layer discovery application list;
the determining module is specifically configured to:
judging whether to store the mobile equipment identification number of the mobile equipment or not according to the equipment number of the mobile equipment; if so, determining the mobile equipment identification number of the mobile equipment; if not, distributing the mobile equipment identification number of the mobile equipment to the mobile equipment, writing the equipment identification number of the mobile equipment into the equipment identification number distribution table, extracting the base station identification number of the base station to which the mobile equipment belongs and the position identification number of the mobile equipment, and writing the base station identification number and the position identification number into the discovery information list.
12. The apparatus of claim 11, wherein the sending module is further configured to send the mobile device's mobile device identification number to the mobile device after assigning the mobile device's mobile device identification number to the mobile device.
13. The apparatus of claim 11, wherein after generating the correspondence of the mobile device identification number of the mobile device, the device identification number of the first device, and the application identification number, the determination module is further configured to write the correspondence of the mobile device identification number of the mobile device, the device identification number of the first device, and the application identification number to the control layer discovery application list.
14. An apparatus for application discovery in device-to-device, D2D, communication, comprising:
a receiving module, configured to receive an application discovery broadcast message broadcasted by an access centralized controller, where the application discovery broadcast message includes a mobile device identification number of a mobile device, a mobile device identification number of a first device, and a correspondence relationship between the application identification numbers; the first device is a mobile device which has the application identification number and the distance between the first device and the mobile device conforms to the direct communication distance;
the determining module is used for determining the mobile equipment identification number of the first equipment with the same application identification number according to the mobile equipment identification number of the mobile equipment, the mobile equipment identification number of the first equipment and the corresponding relation of the application identification numbers;
and the communication module is used for carrying out D2D communication with the first equipment according to the mobile equipment identification number of the first equipment.
15. The apparatus of claim 14, further comprising a transmitting module;
the sending module is configured to send a D2D communication application discovery request message to the access centralized controller before receiving the application discovery broadcast message broadcast by the access centralized controller, where the D2D communication application discovery request message includes a device number and an application identification number of the mobile device.
16. The apparatus of claim 15, further comprising an establishment module;
the establishing module is configured to establish a device discovery application list before sending the D2D communication application discovery request message to the access centralized controller;
the determining module is further configured to write, after receiving the broadcast message broadcast by the access centralized controller, a correspondence between the mobile device identification number of the mobile device, the mobile device identification number of the first device, and the application identification number into the device discovery application list.
17. A computer readable storage medium comprising computer readable instructions which, when read and executed by a computer, cause the computer to perform the method of any one of claims 1 to 5 or 6 to 9.
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