KR102211787B1 - Method and apparatus for evading resource collision in mobile communication system - Google Patents

Abstract

In the present invention, different resources are temporally selected based on QoS, emergency class, location, and SA count. A resource collision avoidance method according to an embodiment of the present invention, in a resource collision avoidance method in a terminal in a mobile communication system, includes: listening to SA (Scheduling Assign) information of another terminal; It includes a process of selecting a different resource temporally between terminals based on the SA information.

Description

Resource collision avoidance method and apparatus in mobile communication system {METHOD AND APPARATUS FOR EVADING RESOURCE COLLISION IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a resource collision avoidance method and apparatus in a mobile communication system.

Recently, with the proliferation of wireless devices supporting wireless data communication such as smart phones, effective use of wireless resources has become a social issue as well as technically. Among technologies that reflect this demand, interest in direct device-to-device (D2D) communication, which performs direct communication between users of wireless devices without going through a base station and a network, is rapidly increasing.

D2D communication performed inside a wireless network has advantages such as not only increasing the efficiency of wireless resources, but also reducing power consumption of devices and networks, and expanding the service area of the wireless network. In addition, D2D communication can efficiently distribute the load of the base station due to the support of large-capacity contents by using the proximity of the device.

The D2D communication includes direct (M2M: Mobile-to-Mobile) communication, machine-to-machine (M2M) communication, direct terminal-to-terminal (T2T) communication, and direct interpersonal communication. (P2P: Peer-to-Peer) Proliferation in physical applications can be achieved through various methods such as communication.

In the D2D communication or cellular system, when scheduling assignment (hereinafter referred to as “SA”) resource allocation based on communication, a method of allocating resources so that the SA does not collide is required because D2D terminals compete.

The present invention provides a resource collision avoidance method and apparatus in a mobile communication system for preventing SA collision in a mobile communication system.

A resource collision avoidance method in a mobile communication system according to an embodiment of the present invention, in the resource collision avoidance method in a terminal in a mobile communication system, includes: listening to SA (Scheduling Assign) information of another terminal; It includes a process of selecting a different resource temporally between terminals based on the SA information.

In the apparatus for avoiding resource collision in a mobile communication system according to an embodiment of the present invention, in the apparatus for avoiding resource collisions in a terminal in a mobile communication system, the terminal receives SA (Scheduling Assign) information of another terminal, and It includes a control unit that selects different resources in time.

The present invention can prevent SA collision in a mobile communication system.

The present invention can solve the problem of Half-Duplexing in a mobile communication system.

1 is a frame structure diagram in terminal-to-terminal communication;
2 is a flowchart showing a method of transmitting group information in a mobile communication system according to an embodiment of the present invention;
3 is a structural diagram of a subframe for avoiding resource collisions in a mobile communication system according to the first embodiment of the present invention;
4 is a flow chart showing a method for avoiding resource collision in a mobile communication system according to the first embodiment of the present invention;
5 and 6 are a structure diagram of a subframe and a method for avoiding resource collision in a mobile communication system according to a second embodiment of the present invention;
7 and 8 are a structure diagram of a subframe and a method for avoiding resource collision in a mobile communication system according to a third embodiment of the present invention;
9 is an exemplary view showing a method for avoiding resource collision in a mobile communication system according to a fourth embodiment of the present invention;
10 is a structural diagram of a terminal for avoiding resource collision in the mobile communication system of the present invention;
11 is a structural diagram of a base station for avoiding resource collision in a mobile communication system of the present invention;
12 is a schematic diagram of a communication architecture between vehicles or between vehicle infrastructures according to a fifth embodiment of the present invention; And
13 is a flowchart illustrating a method of preventing a collision between vehicles and transmitting information according to a distance in the fifth embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that the same components in the accompanying drawings are indicated by the same reference numerals as possible. In addition, detailed descriptions of known functions and configurations that may obscure the subject matter of the present invention will be omitted.

In addition, terms or words used in the present specification and claims described below should not be construed as being limited to a conventional or dictionary meaning, and the inventors shall use the concept of terms in order to describe their own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined.

In an embodiment of the present invention to be described later, a wireless network supporting direct communication between devices is assumed to be a D2D network. However, it should not be construed that the technical configuration proposed in the embodiment of the present invention is limited to the D2D network. That is, it may be regarded as self-evident in the same technical field that the technical configuration proposed in the embodiment of the present invention can be equally applied to a cellular system supporting direct communication between devices.

1 is a diagram showing a frame structure in terminal-to-terminal communication.

The terminal allocates a part of an uplink resource from a base station (eNodeB (eNB)) as a D2D discovery or communication resource for communication between terminals. The allocated D2D resource region is represented by a period of 40 ms to 160 ms (as an example in FIG. 1, the period 110 is 40 ms), and the period is composed of subframes continuous with a time of 1 ms. The sub-frame is composed of RBs divided into a time axis and a frequency axis, and the number of RBs is configured differently depending on the system.

A specific frame among the subframes is used as a section for transmitting a scheduling assignment (hereinafter referred to as “SA”) for communication between terminals. The specific frame is referred to as an SA transmission period. In the SA transmission period, the terminal broadcasts an SA message. The SA message includes a data transmission resource index or pattern and a reception ID to be used by the terminal that wants to transmit. The SA transmission period appears periodically within the D2D resource. As a possible embodiment, assuming that the period of the SA transmission period is 10 ms and the period of the D2D resource area is 40 ms, four SA transmission areas 100 exist. The four SA transmission regions 100 are SA logical regions, and the SA logical regions may be divided into several physical SA regions. The terminals broadcast their SA messages in one of the SA transmission intervals and listen to the remaining SA transmission intervals. The transmitted SA is valid for one D2D resource region period. D2D data may be transmitted in the remaining subframes except for the SA transmission period. As an additional embodiment, data for communication may be transmitted in the remaining subframes except for the SA transmission period.

2 is a flowchart illustrating a resource collision avoidance method in a mobile communication system according to an embodiment of the present invention. It will be described how a terminal acquires information of another terminal through FIG. 2.

The SA message according to an embodiment of the present invention includes an interest ID (Interest ID) to avoid the Half-Duplexing problem and SA collision. The Interest ID includes a group that the terminal or user wants to listen to, or an individual ID. The ID of the Group/Individual may be an ID of an Application area or a MAC area. The Interest ID may include one's own group and another person's group, and when the Interest ID is changed, it is applied and transmitted from the next SA. An example of obtaining the Interest ID is a method that belongs to a terminal or a user and is initially pre-configured. In the above case, when the terminal is manufactured or when the terminal subscribes to a service provider, IDs of all groups that use the service are kept in a codebook or similar form. Another example is a method of obtaining the ID of the interest group or individual with the help of a network. When the first group and individual join the network, they register group information on the server and obtain an ID. If a terminal or individual later wants to obtain the ID of the group they want, the terminal sends a request for an Interest ID to a server located on the network side using the group name, and the server sends a message. After receiving the message, it matches the stored group information and sends a response message including the Interest ID.

Second, a resource pattern or index is included in the SA message. The contents are the same as the configuration of FIG. 1.

Third, the SA message includes priority information of the terminal or subscriber and the QoS class of the data to be transmitted. The priority of the terminal or subscriber is expressed as a number from 0 to X and has a different range depending on the system. If the priority of the terminal or subscriber is high, the priority is given to transmission. In other words, terminals that intend to use the same transmission resource may also avoid transmission resources or abandon transmission according to the priority. QoS of transmission data has a high priority when transmission of delay-sensitive data such as Video/Voice is desired. The priority and data QoS of the terminal or subscriber are transmitted as separate data files in the present invention, but may be transmitted after ranking by a combination of the two values if necessary.

Fourth, a location value may be included in the SA message.

Referring to FIG. 2, in step 201, the UE enters a D2D network. In step 203, the UE determines whether it is an In coverage UE or an Out of coverage UE.

In the case of a location, as an embodiment of the present invention, it is largely divided into two types: In coverage and Out of coverage, which are transmission ranges of a base station. The classification can be further divided according to the system. In the case of an in coverage terminal, the terminal obtains an Interest ID in step 205. In addition, when D2D data transmission is desired, the UE requests resource allocation to the eNB including the amount of data to be transmitted, Interst ID, Interst ID list, and buffer amount in step 207. Thereafter, when the eNB generates an SA message based on the amount of received data, Interst ID, Interst ID list, and buffer amount, the UE receives the SA message generated by the base station in step 209. The terminal can obtain its own resource information through the SA message generated by the base station. Accordingly, the in coverage terminal may receive the transmission location of the SA from the eNB, and may include an index and a period to transmit data according to a resource allocation method. Upon receiving the SA message, the terminal transmits the content to the SA transmission region in step 211.

Meanwhile, in the case of an Out of Coverage terminal, the terminal obtains an Interest ID in step 213. Thereafter, in step 215, the terminal listens for SA from the surroundings for a predetermined time. After obtaining the SA information of the other terminal in step 217, the terminal proceeds to step 211 to determine a transmission location and data transmission index by itself, and transmits it to the SA transmission region.

Meanwhile, finally, the SA message includes the SA Count.

SA Count represents the number of remaining SAs that the transmitting terminal will transmit in the D2D period in the future, and when SA transmission is completed, the Count is reduced by one. If the SA Count is 0, no more SAs are transmitted and resources are not occupied. The other terminal may more accurately predict the empty resource in the next period as the Count.

In summary, the SA message may include at least one of ①Interest ID, ②resource pattern or index, priority information of the terminal or subscriber and QoS class of data to be transmitted, ③Location value, and ④SA Count.

3 is a structural diagram of a subframe for avoiding resource collisions in a mobile communication system according to the first embodiment of the present invention.

Referring to FIG. 3, terminal A is in a situation in which a resource is occupied in a current period T0 310, and thus, it broadcasts its own SA in an SA transmission period (subframe 1) to neighbor terminals described in FIG. It delivers the information included in the SA message. At this time, if the terminal B first enters the D2D network in period T0 310 and is an in coverage terminal, an SA is allocated by the base station allocation.

On the other hand, when the terminal B is an out of coverage terminal, it performs an avoidance operation to minimize half duplexing and SA collision. First, SA information of neighboring terminals is obtained by listening to all SAs for a predetermined period. As a possible example, terminal B obtains SA information through the SA transmitted by terminal A in period T0 310. Thereafter, the terminal B first checks the user priority and classifies the terminal capable of communicating with the highest priority. For example, if the user priority of terminal A is higher than the highest grade or terminal B, terminal B selects a resource region including SA and data used by terminal A and an orthogonal resource.

On the other hand, if the user priority of terminal A is equal to or lower than that of general level or terminal B, terminal B checks terminal A's Interest ID. After checking the Interest ID of Terminal A, Terminal B compares it with its own Interest ID.

If UE A's Interest ID contains the ID of itself or its own group, or if UE B's Interest ID does not include the group belonging to UE A, UE B selects a resource regardless of UE A. One exception is the coverage priority of UE A, that is, if UE A is an in coverage UE and UE B is an out of coverage UE, UE B is a resource in a direction that guarantees the resource orthogonality of UE A as much as possible. Choose On the other hand, if the interest groups match, UE B checks the SA Count of UE A.

When the SA Count is 0, that is, in the next period (T1) 320, if the terminal A does not transmit any more SAs and data, the terminal B selects its own resource without considering the resource of terminal A. On the other hand, if the SA Count is not 0, it means that the terminal A transmits the SA and the data to the same resource location in the next period. Therefore, when all of the above conditions are satisfied, the terminal B considers the resource location of the terminal A. Choose a resource.

First, the terminal B determines whether there is a resource that is temporally orthogonal to the terminal A in the SA transmission interval and the D2D data transmission interval in the D2D resource. If there is a resource that can be orthogonal in time, the terminal B selects the corresponding resource and transmits the SA so that the transmitting terminal A can listen to its own SA and data. On the other hand, if inevitably there is no orthogonal resource, UE B determines the QoS of data transmitted by UE A.

If the QoS of the data transmitted by the terminal A is higher than the QoS of the data to be transmitted by the terminal B, the terminal B determines whether or not the data transmission can be delayed. As an example, since each data has a delay requirement for each QoS class, and there is a period in D2D resource transmission, the terminal B compares the corresponding delay requirement with the resource transmission period and according to whether the requirement is satisfied, the terminal B delays its data transmission. (Delay) You can determine whether it is possible. If a transmission delay is possible, in this D2D transmission period, the terminal B does not perform transmission and tries again in the next period. On the other hand, when transmission delay is impossible, terminal B inevitably selects a resource without considering terminal A.

In the above example, two terminals have been exemplified, but the same method can be used to select a transmission resource in consideration of a plurality of terminals.

4 is a flowchart illustrating a method for avoiding resource collision in a mobile communication system according to the first embodiment of the present invention.

Referring to FIG. 4, UE A is currently occupying a resource (step 401), and the situation is, for example, a situation in which UE A is an in coverage UE and received an SA from an eNB and broadcasts it (step 403 ), UE B is an out of coverage UE, and it is assumed that it first enters the D2D network (step 405).

In addition, it is assumed that the terminal B moves from the outside and the region overlaps with the terminal A. Accordingly, the terminal A and the terminal B transmit their SA information to neighboring terminals by broadcasting their SA in the SA transmission period. However, since the SA is transmitted in the same SA transmission period, the terminal A and the terminal B cannot know whether or not each other exists.

At this time, different actions are taken according to the coverage parameter, that is, the location of the terminal. If the UE is in Out of coverage (in FIG. 3, it refers to UE B as an example). The terminal sets the Listen section proposed in the present invention. The Listen section is defined as a section to listen to the SA of another terminal without sending its own SA and data as needed. The setting of the Listen section is first determined by a probability value and is determined every D2D cycle. The determination of the probability is based on the QoS class and requirements of the data it sends. If the QoS requirement is long, UE B has a higher probability of setting it as a Listen section in the next D2D transmission period. Conversely, if the QoS Requirement is low, UE B has a lower probability of setting it as a Listen section in the next D2D transmission period. For example, if the Listen mode is not changed in the next period after the initial SA and D2D data transmission, the probability of the UE B changing to the Listen mode in the next period (T2) increases. The increase in the Listen mode change probability increases until the Listen mode is triggered, and if the terminal B changes to the Listen mode, the Listen mode change probability is initialized.

On the other hand, the in coverage terminal does not use the Listen mode. That is, in principle, the in coverage terminal does not move because it must be controlled by the base station systematically. However, it goes without saying that the in coverage terminal may move depending on the situation.

Therefore, the terminal B, which has re-listened to the neighboring SA by the Listen mode setting of the terminal B, acquires the SA information of the neighboring terminals once again in step 407. As an example, terminal B acquires SA information through the SA transmitted by terminal A in the T1 period. Thereafter, in step 409, the terminal B first checks the user priority and classifies the terminal capable of preferential communication. For example, if the user priority of terminal A is higher than the highest grade or terminal B, terminal B proceeds to step 410 and selects a resource that is orthogonal to the resource region including the SA and data used by terminal A. On the other hand, if the user priority of terminal A is equal to or lower than that of the general class or terminal B, terminal B checks the interest ID of terminal A in step 411. After checking the interest ID of terminal A, terminal B compares it with its own interest ID, and if the interest ID of terminal A contains the ID of the user or the group to which it belongs, or the interest ID of terminal B contains the group of terminal A. If not, proceeds to step 427 and selects a resource irrelevant to terminal A. One exception is the coverage priority of UE A, that is, if UE A is an in coverage UE and UE B is an out of coverage UE, UE B selects a resource in a direction that guarantees resource orthogonality of A as much as possible. On the other hand, if the interest groups match, terminal B proceeds to step 413 and checks the SA Count of terminal A.

If the SA Count is 0, that is, in the next period, if UE A does not transmit any more SAs and data, the UE B proceeds to step 427 and selects its own resource without considering the resource of UE A. However, if the SA Count is not 0, it means that the terminal A proceeds to step 415 and transmits the SA and data to the same resource location even in the next cycle. Therefore, when all of the above conditions are satisfied, the terminal B Choose your own resources based on your location.

First, in step 417, the terminal B determines whether there is a resource that is temporally orthogonal to A in the SA transmission interval and the D2D data transmission interval in the D2D resource. If there is a resource that can be temporally orthogonal, terminal B selects the corresponding resource in step 419 so that terminal A that transmitted the SA can hear its SA and data. On the other hand, if there is no inevitably orthogonal resource, terminal B determines the QoS of data transmitted by terminal A in step 421. If the QoS of the data transmitted by the terminal A is higher than the QoS of the data to be transmitted, the terminal B proceeds to step 423 to determine whether a delay of its data transmission is possible. As an example, since each data has a delay requirement for each QoS class and there is a period in D2D resource transmission, it can be determined according to whether the requirement is satisfied by comparing the corresponding delay requirement and the resource transmission period. If the transmission delay is possible, the terminal B proceeds to step 425 and does not transmit in this D2D transmission period, but tries again in the next period. On the other hand, if the transmission delay is not possible, terminal B inevitably proceeds to step 427 and selects a resource without considering terminal A.

Although the above example has been exemplified by two terminals, the same method can be used to select transmission resources in consideration of a plurality of terminals.

Steps 409, 411, and 413 have been described as "and" operations, but may also be implemented as "or" operations.

5 and 6 illustrate a method and a subframe structure diagram for avoiding resource collisions in a mobile communication system according to a second embodiment of the present invention.

5 and 6 are embodiments of a method of temporally changing to another resource according to a given condition based on group information between terminals that have already occupied a resource.

5 and 6, UE A and UE B are currently occupying resources, and since UE B is an Out of UE, the change to the Listen mode in the T1 period 510 is shown in FIGS. 3 and 4 Since they are different and the rest of the operations are the same, detailed descriptions are omitted (that is, steps 405 in FIG. 4 and steps 605 and 607 in FIG. 6 are different).

Steps 611, 615, and 617 of FIG. 6 are described in FIG. 6 as an "and" operation, but may also be implemented as an "or" operation.

7 and 8 illustrate a method and a subframe structure diagram for avoiding resource collision in a mobile communication system according to a third embodiment of the present invention.

7 and 8 are another embodiment of a method of temporally changing to another resource according to a given condition based on group information between terminals that have already occupied a resource.

7 and 8, UE A, UE B, and UE D are currently occupying resources (steps 801, 805, and 811), and the situation is, for example, UE A is an In coverage UE. , It is assumed that the SA is received from the eNB and broadcasted (step 803), and the UE B is an out of coverage UE, and it is assumed that UE A and the region overlap with each other by moving 720 from the outside. Accordingly, the terminal A and the terminal B transmit their SA information to neighboring terminals by broadcasting their SA in the SA transmission period. However, UE A and UE B transmit SAs in the same SA transmission period, so that the existence of each other is unknown.

At this time, different actions are taken according to the coverage parameter, that is, the location of the terminal. If the UE is out of coverage (referring to UE B as an example in FIGS. 7 and 8), UE B performs intelligent resource hopping proposed in the present invention. The intelligent resource hopping assumes that a collision occurs in the time axis of the region transmitting its SA, and during one D2D period, the SA message of the remaining SA periods excluding the SA region transmitted by itself is listened to, and the SA listened to in the next period. It means to change the SA transmission section by referring to the message.

First, UE B listens for resources during unallocated subframes in step 807. In step 809, the terminal B broadcasting the SA message in subframe 1 acquires the SA information of the terminal C and terminal D that listened to the SA in the remaining SA transmission intervals 11, 21, and 31 subframes. Terminal B calculates a hopable resource area in step 815. The resource area available for hopping is determined in the following manner.

Terminal B proceeds to step 817 and first checks the user priority and classifies the terminal capable of having the highest priority communication. For example, if the user priority of terminal C is higher than the highest grade or terminal B, terminal B proceeds to step 825 to determine that it is a non-hopping area, and does not hop to a resource area including SA and data used by terminal C. . On the other hand, if the user priority of terminal C and terminal D is equal to or lower than that of general level or terminal B, terminal B checks the interest IDs of terminal C and terminal D in step 819. After checking the interest ID of terminal C and terminal D, terminal B compares it with its own interest ID, and if the interest ID of terminal C and terminal D contains the ID of itself or the group to which it belongs, or terminal C is in the interest ID of terminal B If the group belonging to the terminal D is not included, the resource region of the terminal C and the terminal D is also determined as a hopping possible region. On the other hand, when the interest group matches, terminal B checks the SA counts of terminals C and D in step 821. If the SA Count is 0, that is, in the next period (T1) 710, if A does not transmit any more SAs and data, the terminal B proceeds to step 823 and considers the resource regions of terminals C and D as a hopping possible target. do. On the other hand, if the SA Count is not 0, the terminal B proceeds to step 825 to determine the resource region as a hopping impossible region.

Therefore, in the T1 period 710, the terminal B determines whether or not the resource region occupied by the terminal C and the terminal D can be hopping after excluding the subframe 1 that it transmitted in step 827.

If there is a resource capable of hopping in step 827, the terminal B proceeds to step 829, randomly selects one of the hopping-capable regions, and broadcasts the SA to the corresponding place.

On the other hand, if there is no resource that can inevitably be hopping in step 827, the terminal B does not attempt hopping in step 831 and transmits the SA in the resource region originally broadcasted by it.

On the other hand, the in coverage terminal does not use the intelligent hopping, that is, in principle, the in coverage terminal does not move because it must be systematically controlled by the base station.

Steps 817, 819, and 821 have been described as "and" operations, but may also be implemented as "or" operations.

9 is an exemplary diagram showing a method for avoiding resource collision in a mobile communication system according to a fourth embodiment of the present invention.

The terminal A 910 and the terminal B 920 are D2D terminals that want to transmit data, transmit an SA using an SA interval, and broadcast D2D data using a data interval. If at this time, UE C, which only wants to receive in coverage, can listen to all SAs around it. If so, the terminal C 940 may determine the SA of terminals A and B to obtain information on whether the Interest ID matches, the priority of the terminal, coverage, and the remaining SA count. If the process of matching the interest IDs of UE A and UE B is performed, but unfortunately, if a half-duplexing problem occurs due to transmission of an SA in the same subframe, the UE C 930 transmits a collision report 940 to the base station. The base station determines a corresponding element and transmits a Resource RE-Assign message for adjusting the SA and data transmission resources to the terminal in coverage, that is, terminal A 910 in the next period.

10 is a structural diagram of a terminal for avoiding resource collision in the mobile communication system of the present invention.

Referring to FIG. 10, a terminal includes a transmission/reception unit 1030, a reception unit 1010, a control unit 1010, a memory unit 1040, and a user interface unit 1020.

The transmitting/receiving unit 1030 includes a transmitting module and a receiving module for transmitting and receiving data to and from a base station according to an embodiment of the present invention in a mobile communication system. In addition, the transmission/reception unit 1030 transmits a message for requesting a resource to the base station. In an embodiment of the present invention, the transmission/reception unit 1030 receives an SA message from a base station. The SA message may include at least one of ①Interest ID, ②resource pattern or index, priority information of the terminal or subscriber, QoS class of data to be transmitted, ③Location value, and ④SA Count.

According to an embodiment of the present invention, the control unit 1020 does not temporally select the same resource between terminals based on information included in the SA message received from the base station.

The memory unit 1240 stores or extracts various types of data necessary to avoid resource collision in a mobile communication system according to an embodiment of the present invention.

The user interface unit 1020 transmits information inputted by a user's manipulation to the control unit 1010 or provides necessary information to the user under the control of the control unit 1010.

11 is a structural diagram of a base station for avoiding resource collision in a mobile communication system of the present invention.

Referring to FIG. 11, a base station includes a transmission/reception unit 1120, a memory unit 1130, and a control unit 1110.

The transmitter/receiver 1120 transmits/receives data to/from the terminal to avoid resource collisions to the terminal according to an embodiment of the present invention in a mobile communication system.

The memory unit 1130 stores or extracts various types of data necessary for avoiding resource collisions from a terminal according to an embodiment of the present invention in a mobile communication system.

The control unit 1110 allocates resources in a mobile communication system by a resource collision avoidance method according to an embodiment of the present invention.

Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. The scope of the present invention is indicated by the scope of the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. It must be interpreted.

In addition, the method and system according to an embodiment of the present invention can be implemented as computer-readable codes on a computer-readable recording medium. The computer-readable recording medium includes all types of recording devices that store data that can be read by a computer system. Examples of the recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and also include those implemented in the form of a carrier wave (for example, transmission through the Internet).

As an example, the resource avoidance method can be applied to communication between vehicles or between vehicle infrastructures.

12 is a diagram schematically illustrating a communication architecture between vehicles or between vehicle infrastructures according to a fifth embodiment of the present invention.

First, a vehicle-mounted device (hereinafter referred to as "On Board Unit") 1210 is installed inside the vehicle. The On Board Unit 1210 includes various sensors 1220 of the vehicle, a camera 1230, a display (eg, Head UP Display: HUD) 1260, an actuator 1240, and a control unit 1250. Is connected to. For example, the sensor 1220 attached to the vehicle detects an abnormal situation of the vehicle through periodic status check. As an example, the abnormal situation of the vehicle means a breakdown of the vehicle, an explosion of an airbag, an operation of a collision sensor, and the like.

The actuator 1240 detects an acceleration or deceleration of the vehicle.

The control unit 1250 serves to transfer information such as vehicle detail control and differential control to the on board unit 1210.

The on board unit 1210 has an interface capable of communicating with various sensors 1220 of the vehicle, a camera 1230, a display 1260, an actuator 1240, and a control unit 1250. An example of the interface is a controller area network (CAN) protocol. The on board unit 1210 may include a diagnostic module 1211 for analyzing information received from the sensors 1220 and diagnosing an analysis result, and a memory 1213 for storing information when necessary. The On Board Unit 1210 includes a communication modem module 1215 for data communication with an external device, and can be directly or indirectly connected to a network through this.

The UE (User Equipment) 1270 may be connected to a network, a cellular base station, or a Road Side Unit (RSU), and may be connected to a Wi-Fi Access Point (AP) when necessary. This is referred to as a V2I (Vehicle-to-Infrastructure) area. The UE 1270 is connected to the communication modem module 1215 of the On Board Unit 1210 for communication with the vehicle. The communication protocol between the UE 1270 and the communication modem module 1215 of the On Board Unit 1210 is It doesn't matter anything. As an example, the communication protocol may use Long Term Evolution Direct (LTE-D), Bluetooth, and Wi-Fi Direct.

The UE 1270 plays a role of helping vehicle network connection when necessary, and is capable of discovery and communication with UEs of other vehicles. The communication area between the direct or in-vehicle UEs of the vehicle is referred to as a vehicle-to-vehicle (V2V) area.

Data generated in the vehicle is transmitted to the data server (S-Cloud) 1290 directly by the vehicle or through the in-vehicle UE 1270. The data server 1290 may largely include modules such as a DB (DataBase) 1292, a data analyzer 1294, and an authentication 1296.

The DB 1292 refers to a space for indexing data generated from vehicles, collecting and systematically storing data.

The data analyzer 1294 categorizes and analyzes the collected data based on certain promised criteria.

Finally, authentication 1296 authenticates the user account. The data generated from the vehicle is classified in units of user accounts through authentication 1296, a required data part is processed through the data analyzer 1294, and indexed and stored in the DB 1292. Later, the information is used to provide information or control the vehicle.

The V2X Control Server (hereinafter, referred to as “control server”) 1280 processes and manages signals required for automatic/direct control or information exchange of a vehicle. The control server 1280 may include modules such as Code Generator/Decoder 1282, Controller 1284, and Authtication 1286. Code Generator/Decoder (1282) plays a role of changing information necessary for inter-terminal search into code. The information required for inter-terminal search may be fixed information such as a unique ID of a vehicle and an emergency stop command, for example, and when the vehicle starts and starts temporarily, the Code Generator/Decoder 1282 is required from the terminal (e.g. , Temporary information) and converts it into a code, and interprets it if the terminal requests code interpretation.

The controller 1284 is used to directly/indirectly control a vehicle, and if necessary, it is determined by using information in the data server. Finally, Authentication(1286) authenticates users for each account.

13 is a flowchart illustrating a method of preventing a collision between vehicles and transmitting information according to distance in a fifth embodiment of the present invention.

The fifth embodiment is based on the vehicle communication architecture proposed in the present invention.

UE A of FIG. 13 is a terminal within a distance of, for example, 50 m from the UE, UE B is a terminal within a distance of, for example, 300 m from the UE, and UE C is, for example, a terminal within a distance of, for example, 1 km from the UE. When the terminal or vehicle itself needs driving information using collected OBD (On-Board Diagnostics) information such as its own sensors and cameras, and GPS (Global Positioning System) information, information of surrounding vehicles is required through Discovery. To the data server (S-Cloud) (step 1302)

When necessary, the RSU stores discovery information in the data server through discovery with the terminal. The data server determines vehicle location and lane information based on the above information, and can express this as a MAP.

If an accident occurs due to a vehicle collision at a certain point, the OBD of the in-vehicle UE determines the accident by synthesizing the airbag burst or the collision sensor on the vehicle bumper, vehicle detail control information, etc. (Step 1304) The determined in-vehicle UE transmits or reports the abnormal situation to the data server (S-cloud) (step 1306). The data server of FIG. 13 simultaneously functions as a control server. At the same time as step 1306, the in-vehicle UE that determines the accident transmits or reports a discovery signal or data using direct communication to a nearby vehicle (step 1308). Here, as an example, the discovery signal or data is transmitted to UE A in a nearby vehicle. It is assumed to have been transmitted or reported. In the above situation, problem situations such as efficient use of resources and half-duplexing may cause fatal errors, so the avoidance method proposed in the present invention can be used.

Upon receiving an abnormal situation from the UE, UE A in the nearby vehicle interprets the code or message, and determines the possibility of a collision using the speed and acceleration information of the OBD information, and the MAP information received from the data server (step 1310). If there is a possibility of a collision, UE A performs emergency braking using the control area (step 1314). In addition, UE A broadcasts the message to the surroundings by adding a Relay Indication (step 1318). Through this, another additional collision can be prevented, and the resource avoidance method proposed in the present invention can also be used.

In order to obtain more information, as in step 1306, the data server requests the neighboring vehicles of the accident vehicle to upload the information after receiving the report of the occurrence of the abnormal situation (step 1312). The upload requested information is, for example, black box information. , OBD information, etc. The neighboring terminals receiving the request upload the black box image to the data server (step 1316). The operations of steps 1312 and 1316 may operate at any point after step 1306.

The data server, which simultaneously performs data server operation and control server operation, notifies UE B of an accident to prevent further accidents of UE B, which are a little further away from the accident point, and performs traction control when necessary. (Step 1320) The traction control can be canceled by an action of the user. In addition, when an abnormal situation is transmitted from the UE, the data server performs traction control through the speed and MAP of the vehicle in front. In the traction control situation, UE B prevents further damage by broadcasting its state to the surroundings (step 1322). Step 1322 may be performed by a data server or another application server that has received data server information.

Finally, the data server, which performs data server operation and control server operation at the same time, is far away, so there is no fear of direct collision damage, but input into vehicle MAP information and navigation for in-vehicle UE C that may receive indirect damage such as traffic jams. The route is reset by analyzing the destination, etc., and distributing the optimal route in consideration of the congestion of the road. (Steps 1324 and 1326) Steps 1324 and 1326 are the data server or data that simultaneously performs data server operation and control server operation. Other application servers that received information from the server can run.

The present invention described above, for those of ordinary skill in the technical field to which the present invention pertains, various substitutions, modifications, and changes are possible within the scope of the technical spirit of the present invention. It is not limited by the drawings.

Claims (18)

In the method of avoiding resource collision in a first terminal in a mobile communication system,
Receiving SA (scheduling assign) information of a second terminal, wherein the SA information includes information related to an interest ID (identifier) of the second terminal; And
The process of selecting a first resource for the first terminal based on the SA information, wherein the first resource is different from the second resource selected for the second terminal; including,
Wherein the interest ID includes a group ID or individual ID associated with the interest of the second terminal.
The method of claim 1,
The SA information includes a resource pattern or index of the second terminal, priority information of the second terminal, a quality of service (QoS) class of data to be transmitted by the second terminal, and a location of the second terminal ( location), and at least one of the SA count of the second terminal.
The method of claim 1, wherein the first resource for the first terminal is distinguished from the second resource for the second terminal in terms of at least one of a time domain or a frequency domain.
The method of claim 2,
When the second terminal occupies resources and the first terminal enters a new network,
Receiving the SA information from the second terminal;
Comparing the user priority of the first terminal with the user priority of the second terminal included in the SA information;
Selecting resources by avoiding the resources occupied by the second terminal when the user priority of the second terminal is higher than the priority of the first terminal; And
And when the user priority of the second terminal is lower than or equal to the priority of the first terminal, determining whether the interest ID of the second terminal and the interest ID of the first terminal match.
The method of claim 4,
If the interest ID of the second terminal and the interest ID of the first terminal do not match, selecting resources by avoiding a resource region in which a collision occurs;
When the interest ID of the second terminal and the interest ID of the first terminal match,
Determining whether the SA count of the second terminal is 0;
When the SA count of the second terminal is 0, selecting resources without considering the resources occupied by the second terminal; And
And when the SA count of the second terminal is not 0, selecting resources in consideration of the resources occupied by the second terminal.
The method of claim 5,
Comparing a QoS class of data to be transmitted by the second terminal and a QoS class of data to be transmitted by the first terminal;
If the QoS class of the data to be transmitted by the second terminal is lower than the QoS class of the data to be transmitted by the first terminal, selecting resources without considering the resources occupied by the second terminal;
When the QoS class of data to be transmitted by the second terminal is higher than the QoS class of data to be transmitted by the first terminal,
Determining whether data transmission delay of the first terminal is possible;
Transmitting the data of the first terminal in a next D2D transmission period without transmitting the data of the first terminal in a current device to device (D2D) transmission period when a transmission delay of the data of the first terminal is possible; And
And if the data transmission delay of the first terminal is not possible, selecting resources without considering the resources occupied by the second terminal.
The method of claim 1,
When the first terminal and the second terminal occupy resources,
Switching to a listen mode in a specific cycle;
Receiving the SA information from the second terminal in the specific period;
Comparing the user priority of the first terminal with the user priority of the second terminal included in the SA information;
Selecting resources by avoiding the resources occupied by the second terminal when the user priority of the second terminal is higher than the priority of the first terminal; And
And when the user priority of the second terminal is lower than or equal to the priority of the first terminal, determining whether the interest ID of the second terminal and the interest ID of the first terminal match.
The method of claim 7,
If the interest ID of the second terminal and the interest ID of the first terminal do not match, selecting resources by avoiding a resource region in which a collision occurs;
When the interest ID of the second terminal and the interest ID of the first terminal match,
Determining whether the SA count of the second terminal is 0;
When the SA count of the second terminal is 0, selecting resources without considering the resources occupied by the second terminal; And
And when the SA count of the second terminal is not 0, selecting resources in consideration of the resources occupied by the second terminal.
The method of claim 8,
Comparing a QoS class of data to be transmitted by the second terminal and a QoS class of data to be transmitted by the first terminal;
If the QoS class of the data to be transmitted by the second terminal is lower than the QoS class of the data to be transmitted by the first terminal, selecting resources without considering the resources occupied by the second terminal;
When the QoS class of data to be transmitted by the second terminal is higher than the QoS class of data to be transmitted by the first terminal,
Determining whether data transmission delay of the first terminal is possible;
Transmitting the data of the first terminal in a next D2D transmission period without transmitting the data of the first terminal in a current device to device (D2D) transmission period when a transmission delay of the data of the first terminal is possible; And
And if the data transmission delay of the first terminal is not possible, selecting resources without considering the resources occupied by the second terminal.
In the resource collision avoidance apparatus in a first terminal in a mobile communication system,
A transceiver; And
Controlling the transmission/reception unit to receive SA (scheduling assign) information of a second terminal, wherein the SA information includes information associated with an interest ID (identifier) (ID) of the second terminal,
Selecting a first resource for the first terminal based on the SA information, wherein the first resource is different from the second resource selected for the second terminal, including a control unit,
And the interest ID includes a group ID or individual ID associated with the interest of the second terminal.
The method of claim 10,
The SA information includes a resource pattern or index of the second terminal, priority information of the second terminal, a QoS class of data to be transmitted by the second terminal, a location of the second terminal, and the The apparatus comprising at least one of the SA counts of the second terminal.
The apparatus of claim 10, wherein the first resource for the first terminal is distinguished from the second resource for the second terminal in terms of at least one of a time domain or a frequency domain.
The method of claim 12, wherein the control unit,
When the second terminal occupies resources and the first terminal enters a new network,
Controlling the transceiver to receive the SA information from the second terminal,
Compare the user priority of the second terminal included in the SA information with the user priority of the first terminal,
When the user priority of the second terminal is higher than the priority of the first terminal, resources occupied by the second terminal are avoided to select resources,
When the user priority of the second terminal is lower than or equal to the priority of the first terminal, it is determined whether the interest ID of the second terminal and the interest ID of the first terminal match.
The method of claim 13, wherein the control unit,
When the interest ID of the second terminal and the interest ID of the first terminal do not match, resources are selected by avoiding a resource region in which a collision occurs,
When the interest ID of the second terminal and the interest ID of the first terminal match,
Determine whether the SA count of the second terminal is 0,
When the SA count of the second terminal is 0, resources are selected without considering the resources occupied by the second terminal,
And when the SA count of the second terminal is not 0, resources are selected in consideration of resources occupied by the second terminal.
The method of claim 14, wherein the control unit,
Compare the QoS class of data to be transmitted by the second terminal and the QoS class of data to be transmitted by the first terminal,
When the QoS class of the data to be transmitted by the second terminal is lower than the QoS class of the data to be transmitted by the first terminal, resources are selected without considering the resources occupied by the second terminal,
When the QoS class of data to be transmitted by the second terminal is higher than the QoS class of data to be transmitted by the first terminal,
Determining whether data transmission delay of the first terminal is possible;
When the data transmission delay of the first terminal is possible, the transmission/reception unit transmits the data of the first terminal in the next D2D transmission period without transmitting the data of the first terminal in the current device to device (D2D) transmission period. Control,
When the transmission delay of the data of the first terminal is not possible, the device, characterized in that the resource is selected without considering the resources occupied by the second terminal.
The method of claim 10, wherein the control unit,
When the first terminal and the second terminal occupy resources,
Switch to listen mode at a specific cycle,
Controlling the transceiver to receive the SA information from the second terminal in the specific period,
Compare the user priority of the second terminal included in the SA information with the user priority of the first terminal,
When the user priority of the second terminal is higher than the priority of the first terminal, resources occupied by the second terminal are avoided to select resources,
When the user priority of the second terminal is lower than or equal to the priority of the first terminal, it is determined whether the interest ID of the second terminal and the interest ID of the first terminal match.
The method of claim 16, wherein the control unit,
When the interest ID of the second terminal and the interest ID of the first terminal do not match, resources are selected by avoiding a resource region in which a collision occurs,
When the interest ID of the second terminal and the interest ID of the first terminal match,
Determine whether the SA count of the second terminal is 0,
When the SA count of the second terminal is 0, resources are selected without considering the resources occupied by the second terminal,
And when the SA count of the second terminal is not 0, resources are selected in consideration of resources occupied by the second terminal.
The method of claim 17, wherein the control unit,
Compare the QoS class of data to be transmitted by the second terminal and the QoS class of data to be transmitted by the first terminal,
When the QoS class of the data to be transmitted by the second terminal is lower than the QoS class of the data to be transmitted by the first terminal, resources are selected without considering the resources occupied by the second terminal,
When the QoS class of data to be transmitted by the second terminal is higher than the QoS class of data to be transmitted by the first terminal,
Determine whether the transmission delay of the data of the first terminal is possible,
When the data transmission delay of the first terminal is possible, the transmission/reception unit transmits the data of the first terminal in the next D2D transmission period without transmitting the data of the first terminal in the current device to device (D2D) transmission period. Control,
And when the transmission delay of the data of the first terminal is not possible, resources are selected without considering the resources occupied by the second terminal.

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