WO2017173664A1

WO2017173664A1 - Communication resource allocation method and device

Info

Publication number: WO2017173664A1
Application number: PCT/CN2016/078893
Authority: WO
Inventors: 陈光日; 华尧; 李明超; 韩广林
Original assignee: 华为技术有限公司
Priority date: 2016-04-08
Filing date: 2016-04-08
Publication date: 2017-10-12
Also published as: CN108886534B; CN108886534A

Abstract

Provided are a communication resource allocation method and device. When used for a first terminal, the method comprises: obtaining a target resource pool, the target resource pool being determined according to the movement direction of the first terminal; selecting a resource within the target resource pool in order to communicate with another terminal. In the present invention, terminals no longer select resources from resource pools at random, but rather plan in advance what resources to select according to certain rules, for example, dividing resource pools according to a movement direction or directly selecting an adjacent frequency band of another terminal in the same direction. Planning in advance prevents conflicts, thereby reducing the probability of conflicts, and increasing system safety.

Description

Communication resource allocation method and device

Technical field

The present invention relates to distributed communication technologies, and in particular, to a communication resource allocation method and apparatus.

Background technique

With the development of the times, personal safety, traffic efficiency, environmental protection and economic effects have led to the establishment of a complete intelligent transportation system (ITS) has gradually become a global hot spot. In ITS, V2V (Vehicle to Vehicle) technology for communication between vehicles and vehicles is one of the key technologies. Through V2V, vehicles can obtain road condition information or receive information services in time. For example, vehicles can The safety information such as the speed of the vehicle, the direction of travel, the specific position, and whether or not the emergency brake is stepped on are broadcasted to each other, so that the driver can better perceive the traffic situation outside the line of sight and prejudge the dangerous situation and then avoid it.

LTE (Long Term Evolution) is the current mainstream wireless communication technology. The Device to Device (D2D) technology is used as an important feature in 3GPP LTE Release 12 and is standardized. It supports user terminals. Direct communication is allowed. Considering that the V2V communication scenario also belongs to terminal direct communication, the V2V service can be transmitted based on the D2D technology. The D2D technology has a distributed transmission mode. In the distributed transmission mode, the communication resources are divided into one or more resource pools. When the user transmits data, a resource is randomly selected in the resource pool to send data.

However, since the D2D distributed transmission mode employs a random transmission mechanism, there are cases where a plurality of neighboring users randomly select the same resource and transmit data, which will cause a transmission collision and cause a collision. And as user density increases, such collisions will become more apparent. In the Internet of Vehicles, because the vehicle needs to send V2V information frequently during driving, the service density is large. If the V2V information is transmitted using the D2D distributed transmission mode, the transmission resource conflict will be serious, resulting in the failure of the security information on time. Arrived, which affects the reliability of the security system. For example, suppose a certain security information (such as CAM, Cooperative Awareness Message, Cooperative Awareness Information) has a transmission period of 100 ms, and is transmitted in a manner of equal resource granularity. Each 20 M carrier bandwidth is divided into 3 users, and 100 ms has 300 available resource assumptions. There are 20 users who perform resource scheduling in a freely competitive way. The probability of collision of 20 users is 1-(300!/280!)/300^20=51.2%, which means that only 20 cars pass. In the case, there is more than 50% probability of resource collision, which seriously affects the safety information transmission. The reliability of the loss.

Summary of the invention

In order to overcome the problems existing in the prior art, the present invention provides a communication resource allocation method and apparatus, to solve the technical problem that a collision may occur when each terminal selects a communication resource in terminal communication.

In one aspect, an embodiment of the present invention provides a communication resource allocation method, where the method is used in a first terminal, and the method includes:

Obtaining a target resource pool, where the target resource pool is determined according to a moving direction of the first terminal;

Selecting resources in the target resource pool to communicate with other terminals.

In one possible design, the obtaining a target resource pool includes:

Obtaining a moving direction of the first terminal;

And determining the target resource pool according to the motion direction and the resource pool allocation information, where the resource pool allocation information is used to indicate a resource pool corresponding to different motion directions.

For vehicles with different driving directions (assuming n directions), different resources are reserved, which is equivalent to selecting N vehicles from M resources, and N/n vehicles are selected among M/n resources. Although the fission gain through the resource pool is not large, the probability of resource conflicts in vehicles in different directions is greatly reduced, which greatly improves the safety of driving, and also helps to improve system scheduling efficiency.

In a possible design, the obtaining a direction of motion of the first terminal includes:

Obtained from the application layer; or,

Obtained through its own geolocation information; or,

Receiving a direction of motion of the first terminal sent by the control device.

In one possible design, the resource pool allocation information is preset in the first terminal, or the resource pool allocation information is received from a broadcast of the control device.

In one possible design, the obtaining a target resource pool includes:

Receiving indication information of the control device for the resource pool;

Determining the target resource pool according to the indication information.

In one possible design, the selecting a resource in the target resource pool includes at least one of the following:

If there are unoccupied resources in the target resource pool, select unoccupied resources in the target resource pool;

If the resources in the target resource pool are occupied, the resource selected by the second terminal is selected in the target resource pool, and the second terminal is in the same direction as the first terminal in the other terminal. And the farthest terminal.

This is because the mutual threat between the first terminal and the terminal that is the most distant from the same direction (that is, the second terminal) is relatively minimal, and even if there is a resource conflict, the resources in the target resource pool are all acceptable. When occupied, the first terminal may select a resource selected by the second terminal to communicate in the target resource pool.

In one possible design, the direction of the other terminal and the distance from the first terminal are obtained by:

Obtained from the application layer; or,

Obtaining according to the Doppler frequency offset extension of the other terminal; or,

Obtained from the security information sent by the other terminal; or,

The reference signal received power RSRP acquisition is performed by measuring the air interface resources occupied by the other terminals.

In one possible design, the terminal is a vehicle.

In another aspect, an embodiment of the present invention provides a communication resource allocation method, where the method is used to control a device, and the method includes:

Broadcasting the resource pool allocation information to the first terminal, so that the first terminal determines, according to the moving direction of the mobile terminal and the resource pool allocation information, a target resource pool for selecting a resource, where the resource pool allocation information is used to indicate a resource pool corresponding to different directions of motion;

or,

Obtaining the direction of motion of the first terminal,

And transmitting a target resource pool to the first terminal according to the moving direction, so that the first terminal selects a resource in the target resource pool to communicate with other terminals.

In this way, different resources are reserved for vehicles with different driving directions (assuming n directions), which is equivalent to selecting N vehicles from N resources, and N/n vehicles are selected among M/n resources. Although the fission gain through the resource pool is not large, the probability of resource conflicts in vehicles in different directions is greatly reduced, which greatly improves the safety of driving, and also helps to improve system scheduling efficiency.

In a possible design, the obtaining the direction of motion of the first terminal includes:

Obtained from the application layer; or,

Obtaining according to the Doppler frequency offset extension of the first terminal; or

Obtained from the security information sent by the first terminal; or,

The reference signal received power RSRP acquisition is performed by measuring the air interface resource occupied by the first terminal.

In a possible design, before the broadcast resource pool allocation information, the method further includes:

Receiving security information broadcast by each terminal;

Determining terminal status information according to the security information, where the terminal status information includes The number of terminals in the moving direction and in each direction of motion;

Determining the resource pool allocation information according to the terminal status information.

In one possible design, the control device is a roadside unit RSU and the terminal is a vehicle.

In another aspect, an embodiment of the present invention provides a communication resource allocation method, where the method is used in a first terminal, and the method includes:

Obtaining a set of terminals whose motion direction is gradually away from the first terminal;

Determining a second terminal in the set of terminals;

An adjacent frequency band of a frequency band used for communication by the second terminal is selected to communicate with other terminals.

Vehicles that leave each other receive less valuable information from the other party, because vehicles that are already far away are basically no threat to the vehicle. Therefore, it is possible to arrange vehicles that are far away from each other to transmit safety information in adjacent frequency bands, which is equivalent to dividing communication resources so that communication resources used between dangerous vehicles (for example, vehicles approaching each other) are different, so that Avoid resource conflicts between vehicles that are in danger and ensure safe driving.

In a possible design, the determining the second terminal in the set of the terminal comprises:

Determining, in the set of the terminals, a terminal that is closest to the first terminal as the second terminal.

Selecting the nearest vehicle can reduce the impact of the near-far effect on some other vehicles and further improve the reliability of message transmission.

In a possible design, the acquiring a moving direction is a set of terminals gradually away from the first terminal, including:

Measuring reference signal received power RSRP of the air interface resources occupied by other terminals;

A terminal in which the RSRP is changed from gradually larger to gradually smaller is selected into the set of the terminals.

In a possible design, the terminal that is closest to the first terminal in the set of the terminal is determined as the second terminal, and includes:

The terminal whose time is the closest to the current time corresponding to the turning point from the gradual change to the gradual change of the RSRP is determined as the second terminal.

In still another aspect, an embodiment of the present invention provides a communication resource allocation apparatus, where the apparatus is used in a first terminal, and the apparatus includes:

a target resource pool obtaining unit, configured to acquire a target resource pool, where the target resource pool is determined according to a moving direction of the first terminal;

And a resource selection unit, configured to select a resource in the target resource pool acquired by the target resource pool obtaining unit to communicate with other terminals.

In a possible design, the target resource pool obtaining unit includes:

a direction acquiring subunit, configured to acquire a moving direction of the first terminal;

a first target resource pool determining subunit, configured to determine the target resource pool according to the resource pool allocation information and the direction of motion acquired by the direction acquiring subunit, where the resource pool allocation information is used to indicate that the different motion directions correspond to Resource pool.

In a possible design, the manner in which the direction acquiring subunit acquires the moving direction of the first terminal includes:

Obtained from the application layer; or,

Obtained through its own geolocation information; or,

In a possible design, the target resource pool obtaining unit includes:

An indication information receiving subunit, configured to receive indication information of the control device for the resource pool;

And a second target resource pool determining subunit, configured to determine the target resource pool according to the indication information received by the indication information receiving subunit.

In a possible design, the manner in which the resource selection unit selects a resource in the target resource pool includes at least one of the following:

Obtained from the application layer; or,

Obtained from the security information sent by the other terminal; or,

In one possible design, the terminal is a vehicle.

In still another aspect, an embodiment of the present invention provides a communication resource allocation apparatus, where the apparatus is used to control a device, and the apparatus includes:

a resource pool allocation information broadcast unit, configured to broadcast resource pool allocation information to the first terminal, so that the first terminal determines, according to the direction of motion and the resource pool allocation information, a target resource pool for selecting a resource to perform communication, The resource pool allocation information is used to indicate resources corresponding to different motion directions. Source pool

or,

a target resource pool sending unit, configured to acquire a moving direction of the first terminal, and send a target resource pool to the first terminal according to the moving direction, so that the first terminal selects a resource in the target resource pool to Other terminals communicate.

In a possible design, the manner in which the target resource pool sending unit acquires the moving direction of the first terminal includes:

Obtained from the application layer; or,

Obtained from the security information sent by the first terminal; or,

In one possible design, the device further includes:

a resource pool allocation information determining unit, configured to receive security information broadcasted by each terminal, and determine terminal state information according to the security information, where the terminal state information includes a moving direction of each terminal and a number of terminals in each moving direction, according to the The terminal status information determines the resource pool allocation information.

a terminal set obtaining unit, configured to acquire a set of terminals whose moving direction is gradually away from the first terminal;

a terminal selection unit, configured to determine a second terminal in the set of terminals acquired by the terminal set obtaining unit;

And a resource selection unit, configured to select an adjacent frequency band of a frequency band used by the second terminal to communicate with other terminals.

The reference signal received power RSRP of the air interface resource occupied by the other terminal is measured, and the terminal whose RSRP changes from gradually becoming larger to gradually smaller is selected into the set of the terminal.

The time from the gradual change to the gradual change to the gradually decreasing turn point is the closest to the current time. The terminal is determined to be the second terminal.

In a further aspect, an embodiment of the present invention provides a terminal, including:

At least one processor, configured to acquire a target resource pool, and select a resource in the target resource pool, where the target resource pool is determined according to a moving direction of the terminal;

And a transmitter, configured to communicate with other terminals according to the selected resource in the target resource pool by the at least one processor.

In still another aspect, an embodiment of the present invention provides a control device, including:

a transmitter, configured to broadcast resource pool allocation information to the terminal, so that the terminal determines, according to the direction of motion of the mobile device and the resource pool allocation information, a target resource pool for selecting a resource, where the resource pool allocation information is used for communication. Indicates a resource pool corresponding to different motion directions, or is used to send a target resource pool to the terminal, so that the terminal selects resources in the target resource pool to communicate with other terminals;

And at least one processor, configured to acquire a motion direction of the terminal before sending the target resource pool to the terminal, and determine the target resource pool according to the motion direction.

At least one processor, configured to acquire a set of terminals whose motion direction is gradually away from the current terminal, and determine a second terminal in the set of the terminals;

And a transmitter, configured to select an adjacent frequency band of a frequency band used by the second terminal to communicate with other terminals.

In still another aspect, an embodiment of the present invention provides a communication system, where the system includes the foregoing terminal that can acquire a target resource pool and the foregoing control device.

In still another aspect, an embodiment of the present invention provides a communication system including at least two terminals that can acquire a set of terminals.

In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the terminal, including a program designed to perform the above aspects.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

In the embodiment of the present invention, each terminal does not randomly select resources from the resource pool, but pre-plans in advance according to a certain rule, what kind of resources should be selected by itself, for example, the resource pool may be divided according to the direction of motion or directly selected. Adjacent frequency bands of other terminals in the same direction, so that pre-planning can prevent conflicts and reduce the probability of conflicts, thereby improving system security.

It should be understood that the above general description and the following detailed description are merely exemplary and explanatory. The invention is not limited.

DRAWINGS

The accompanying drawings, which are incorporated in the specification of FIG

1 is a schematic diagram of a possible application scenario of the present invention;

2 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention;

FIG. 3 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention; FIG.

FIG. 4 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention; FIG.

FIG. 5 is a schematic diagram of a possible application scenario of the present invention; FIG.

6 is a schematic diagram of a possible application scenario of the present invention;

FIG. 7 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention; FIG.

FIG. 8 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention; FIG.

FIG. 9 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention; FIG.

10 is a schematic diagram of a possible application scenario of the present invention;

FIG. 11 is a signaling diagram of a communication resource allocation method according to an exemplary embodiment of the present invention; FIG.

FIG. 12 is a schematic diagram of a communication resource allocation apparatus according to an exemplary embodiment of the present invention; FIG.

FIG. 13 is a schematic diagram of a communication resource allocation apparatus according to an exemplary embodiment of the present invention; FIG.

FIG. 14 is a schematic diagram of a communication resource allocation apparatus according to an exemplary embodiment of the present invention; FIG.

FIG. 15 is a schematic structural diagram of a UE according to an exemplary embodiment of the present invention; FIG.

FIG. 16 is a schematic structural diagram of a base station according to an exemplary embodiment of the present invention.

detailed description

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. The following description refers to the same or similar elements in the different figures unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with aspects of the invention as detailed in the appended claims.

The user equipment UE (or terminal) to which the present invention relates may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, and various forms. User Equipment (UE), Mobile Station (MS), Terminal, Terminal Equipment, etc. For convenience of description, in the present invention, the above mentioned devices may be collectively referred to as user equipments or UEs or terminals. Hereinafter, the present invention is mainly exemplified by a UE/terminal as a vehicle.

A base station (BS) according to the present invention is a device deployed in a radio access network to provide a wireless communication function for a UE. The base station may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In a system using different radio access technologies, the name of a device having a base station function may be different. For example, in an LTE network, an evolved Node B (evolved Node B: eNB or eNodeB) is in the third. In the 3G network, it is called Node B and so on. For convenience of description, in the present invention, the above-mentioned devices for providing wireless communication functions to the UE are collectively referred to as a base station or a BS.

When each terminal selects a communication resource, two or more terminals may select the same communication resource, thereby generating a collision or collision (collision/collision) in resource occupation, which is in the present invention. A phenomenon can be referred to as a conflict or a resource conflict.

In the present invention, the control device is a device that plans or coordinates communication resources used by the terminal in order to avoid resource conflicts. As an example, the control device may be a base station, or an RSU (Road Side Unit), or the like.

The techniques described in this disclosure may be applicable to LTE systems, or other wireless communication systems employing various radio access technologies, such as using code division multiple access, frequency division multiple access, time division multiple access, orthogonal frequency division multiple access, single carrier. A system of access technologies such as frequency division multiple access. In addition, it can also be applied to the subsequent evolution system using the LTE system, such as the fifth generation 5G system and the like. For the sake of clarity, only the LTE system is taken as an example here. In the LTE system, the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) is used as the radio access network, and the Evolved Packet (Core, EPC for short) is used as the core network. UE passes E-UTRAN, and EPC Access to the IMS network.

The embodiments of the present invention will be further described in detail below based on the common aspects of the invention described above.

1 is a schematic diagram of a scene in the present invention. In Fig. 1, 101 to 103 are vehicles, and each vehicle can communicate directly with each other. For example, each vehicle can transmit and receive security including vehicle speed, driving direction, specific position, and whether emergency braking is stepped on. Information to better ensure driving safety. Such communication between vehicles may be referred to as V2V, and may be implemented as an example based on D2D technology in LTE. Furthermore, control device 104 may also be present in FIG. 1, such as a base station or an RSU.

FIG. 2 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention. The method can be used for the first terminal. As an example, the first terminal may be a vehicle, and further, may be an in-vehicle communication unit or the like on the vehicle.

Referring to Figure 2, the method includes:

Step S201: Acquire a target resource pool, where the target resource pool is determined according to a moving direction of the first terminal.

All optional communication resources can be used as a large resource pool. In this embodiment, the terminal no longer blindly selects resources from this large resource pool. This large resource pool will be pre-divisioned to obtain several subsets, and this division can be based on the direction of motion of each terminal.

Taking the terminal as a vehicle, for example, when the vehicle is driving on the road, there are usually two directions. Of course, there may be more directions when driving on special roads such as overpasses. The optional resource pools are divided according to the direction, and each terminal selects resources only in the subset of resource pools corresponding to the respective directions, thereby reducing the probability of resource conflicts. The subset of resource pools is the target resource pool of the terminal for the terminal.

Step S202, selecting resources in the target resource pool to communicate with other terminals.

There are many ways to obtain the target resource pool. The present invention is not limited thereto, and is illustrated by FIG. 3 and FIG. 4 below.

As shown in FIG. 3, in this embodiment or some other embodiments of the present invention, the acquiring a target resource pool may include:

Step S301: Acquire a moving direction of the first terminal.

As an example, obtaining the direction of motion of the first terminal may be specifically performed in multiple ways:

Method 1) Obtained from the application layer.

Safety information is information used to ensure driving safety. For example, it may include the speed of the vehicle, the direction of travel, the specific location, and whether or not the emergency brake is applied. In the process of transmitting security information, the underlying layer is usually only responsible for transmitting security information as data, not the content of the transmission, and the application layer is responsible for the security letter. The information is parsed and processed, so information such as the direction of motion contained in the security information can be obtained from the application layer, and then used to help the underlying selection of communication resources.

Mode 2) Obtained by its own geolocation information.

For example, the vehicle can obtain the geolocation information by means of the GPS positioning device installed by itself, and then derive its current driving direction.

Mode 3) receiving a direction of motion of the first terminal sent by the control device.

For example, the roadside unit can determine the direction of motion of the vehicle by detecting the reference signal received power RSRP of the air interface resource occupied by the vehicle, and then inform the vehicle.

In addition, after the terminal knows its own direction of motion in some way, it can carry 1~2bit direction information in the data packet such as security information sent by itself, so as to inform other surrounding terminals and roadside units.

Step S302: Determine the target resource pool according to the motion direction and resource pool allocation information, where the resource pool allocation information is used to indicate resource pools corresponding to different motion directions.

As an example, the resource pool allocation information may be preset in the first terminal, or the resource pool allocation information may be received from a broadcast of the control device.

For example, it can be divided into four standard directions: east, south, west, and north, or divided into east, south, west, north, southeast, northeast, southwest... multiple standard directions, or even more standard directions, each The standard direction can be assigned an angle value of 360 degrees on the basis of the true north. Each standard direction has a corresponding resource pool, for example, the resource pool A in the southeast direction and the resource pool B in the northeast direction, thereby forming resource pool allocation information. In this way, after the vehicle knows the direction of its own movement, according to the resource pool allocation information broadcasted by the preset or roadside unit, the current actual direction of the vehicle is attributed to the divided standard directions, and it can be known which one should be The resource pool serves as its own target resource pool.

As shown in FIG. 4, in this embodiment or some other embodiments of the present invention, the acquiring a target resource pool may also include:

Step S401: Receive indication information of the control device for the resource pool.

Step S402, determining the target resource pool according to the indication information.

In other words, in the scenario of FIG. 4, the terminal does not need to know its own direction and resource pool allocation information, but the control device directly specifies the target resource pool for each terminal.

For example, the resource pool is divided into resource pool A, resource pool B, etc., corresponding to the southeast direction, the northeast direction, and the like. When the roadside unit detects that the traveling direction of a certain vehicle is the southeast direction, the vehicle can be directly notified that the vehicle can only be in the resource. Pool A is selected for the resource pool.

Informing vehicles in different driving directions and selecting different resources for security information transmission, so that different resources allocated by users in different directions can be collected, and the probability of collision in each resource set can be reduced. As an example, see FIG. 5 and FIG. 6. In FIG. 5, there are three vehicles from 501 to 503. Wherein the vehicle 501 travels to the right and the

vehicles

502 and 503 travel to the left. Since the resource pool is not divided according to the direction, the

vehicles

501 and 502 may have conflicts when selecting the communication resource block, which may jeopardize driving safety. In Figure 6, the resources are divided into two categories according to the driving direction. The vehicles driving to the left can only select resources with diagonal lines, and the vehicles driving to the right can only select resources without oblique lines. Vehicles in the direction of travel select resources in different resource pools, avoiding the possibility of resource conflicts between the two vehicles occupying the same time-frequency resources in the opposite direction, thus avoiding traffic accidents.

In the present invention, there is no limitation on how the first terminal specifically selects resources in the target resource pool. For example, the first terminal may randomly select unoccupied resources to be used in the target resource pool, if they are all occupied. , randomly select one of the resources or wait, and so on.

In this embodiment or some other embodiments of the present invention, selecting the resource in the target resource pool may include at least one of the following:

If the resources in the target resource pool are occupied, the resource selected by the second terminal is selected in the target resource pool, where the second terminal is a direction of movement of the other terminal and the first terminal The same and the farthest terminal.

As an example, the directions of other terminals and the distance from the first terminal can be obtained as follows:

Obtained from the application layer; or,

Obtaining according to the Doppler frequency offset of the other terminal (for example, may be a Doppler frequency offset of the data pilot signal); or,

Obtained from the security information sent by the other terminal; or,

After acquiring the direction of the other terminal and the distance from the first terminal, the second terminal can be selected therefrom.

Compared with vehicles in the same direction, traffic accidents between vehicles in different directions are more serious. Therefore, it is more important to ensure timely and safe communication between vehicles in different directions. Therefore, in this embodiment, different Vehicles in the direction of travel (assuming n directions) reserve different resources, equivalent In the selection of N resources from N vehicles, N/n vehicles are selected in M/n resources, although the fission gain through the resource pool is not large, but the vehicles in different directions have resource conflicts. The probability is greatly reduced (the theoretical resource collision probability of the vehicle in different directions is 0), which greatly improves the safety of driving, and also helps to improve the efficiency of system scheduling.

FIG. 7 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention. This method is used to control the device. For example, the control device can be a base station or a roadside unit or the like.

The method can include:

Broadcasting resource pool allocation information to the first terminal, so that the first terminal determines, according to its own motion direction and the resource pool allocation information, a target resource pool for selecting a resource, where the resource pool allocation information is used for communication. Indicates the resource pool corresponding to different directions of motion.

For example, it can be divided into four standard directions: east, south, west, and north, or divided into east, south, west, north, southeast, northeast, southwest... multiple standard directions, or even more standard directions, each The standard direction is given an angle value of 360 degrees on the basis of the true north. Each standard direction has a corresponding resource pool, for example, the resource pool A in the southeast direction and the resource pool B in the northeast direction, thereby forming resource pool allocation information. In this way, after the vehicle knows the direction of its own movement, according to the resource pool allocation information broadcast by the roadside unit, the current actual direction of the vehicle is attributed to the divided standard directions, and it can be known which resource pool should be used as its own. Target resource pool.

Or, as shown in FIG. 7, the method may include:

Step S701, acquiring a motion direction of the first terminal.

Step S702: Send a target resource pool to the first terminal according to the moving direction, so that the first terminal selects resources in the target resource pool to communicate with other terminals.

As an example, the acquiring the direction of motion of the first terminal may include:

Obtained from the application layer; or,

Obtained from the security information sent by the first terminal; or,

As shown in FIG. 8, in this embodiment or some other embodiments of the present invention, before the broadcast resource pool allocation information, the method may further include:

Step S801, receiving security information broadcast by each terminal.

Step S802, determining terminal status information according to the security information, where the terminal status information includes a moving direction of each terminal and a number of terminals in each moving direction.

The control device can obtain information such as the traveling direction of each vehicle based on the obtained safety information, thereby obtaining terminal state information in the current road segment.

In addition, each terminal can directly report its own direction to the control device, and the present invention is not limited thereto.

Step S803, determining the resource pool allocation information according to the terminal state information.

The control device can adjust the number of resource pools in each direction according to the number of vehicles in different directions, and is updated by SIB (System Information Block).

In the present embodiment, different resources are reserved for vehicles in different driving directions (assuming n directions), which is equivalent to selecting N vehicles from N resources, and becomes N/n vehicles in M/n. The choice of resources, although the fission gain through the resource pool is not large, but the probability of resource conflicts in vehicles in different directions is greatly reduced, which greatly improves the safety of driving, and also helps to improve system scheduling. effectiveness.

FIG. 9 is a flowchart of a communication resource allocation method according to an exemplary embodiment of the present invention. The method can be used for the first terminal. As an example, the first terminal may be a vehicle, and further, may be an in-vehicle communication unit or the like on the vehicle.

Referring to FIG. 9, the method may include:

Step S901: Acquire a set of terminals whose motion direction is gradually away from the first terminal.

As an example, as shown in FIG. 10, in FIG. 10, there are more than 1001 to 1006 vehicles, vehicles 1001 to 1002 are one traveling direction, vehicles 1003 to 1005 are another driving direction, and vehicle 1006 is a third driving. In the direction, the vehicle 1001 is the first terminal, and then according to FIG. 10, the

vehicles

1003, 1004, and 1006 are all vehicles that are gradually away from 1001. For vehicle 1002, if its speed is above 1001, then 1002 is also a vehicle that is gradually away from 1001.

Since there is substantially no threat between the terminal that is gradually away from the first terminal and the first terminal, it is acceptable even if the first terminal has a resource conflict with them.

Step S902, determining a second terminal in the set of the terminals.

How to determine the second terminal in the set of slave terminals is not limited in this embodiment.

As an example, the determining the second terminal in the set of the terminal may include:

As an example, the obtaining a moving direction is a set of terminals that are gradually away from the first terminal, and may include:

A terminal in which the RSRP is changed from gradually larger to gradually smaller is selected into the terminal set.

Because the signal power is usually attenuated as the distance increases, when the RSRP is found to gradually increase When it becomes gradually smaller, it can be inferred that the corresponding terminal is gradually moving away from the first terminal.

Step S903, selecting an adjacent frequency band of a frequency band used by the second terminal for communication to perform direct communication with other terminals.

In this embodiment or some other embodiments of the present invention, the determining, by the terminal, the terminal that is closest to the first terminal in the set of the terminal is the second terminal, and the method may include:

The terminal corresponding to the current time is the time when the RSRP is gradually changed from large to small, and the terminal closest to the current time is the terminal that has just passed the first terminal. For example, the current time is 15:12, and the first terminal finds that the RSRP of the terminal A changes from gradually becoming larger to gradually decreasing at 15:05, and the RSRP of the terminal B changes from gradually larger to smaller. The turning point occurs at 15:11, so it can be inferred that terminal B is a terminal that has just passed the first terminal.

Still referring to FIG. 10 as an example, in FIG. 10, the vehicle 1004 is a vehicle that has just passed by the first terminal, that is, the vehicle 1001, so the vehicle 1004 can be determined as the second terminal.

The method of this embodiment will be further described below with reference to examples.

FIG. 11 is a signaling diagram of a communication resource allocation method according to an exemplary embodiment of the present invention.

In step S1101, the vehicle U1 receives the safety information broadcast by the surrounding vehicles U2, U3.

In step S1102, the vehicle U1 counts the mapping position of the surrounding vehicles in the air interface resource, and calculates the RSRP average value of the resources occupied by each vehicle according to each vehicle ID:

PRSRP(n)=PRSRP+(1-q)PRSRP(n-1)

Where q is the forgetting factor and n is the nth time point.

In step S1103, the slope of the fitting curve is calculated according to each PRSRP historical data.

Step S1104: Determine, according to the vehicle ID, a set of the slope of the PRSRP curve occupying the resource from negative to negative.

Step S1105: In the set, select the idle resource of the subframe occupied by the terminal whose PRSRP turning point is located closest to the current time.

In step S1106, the vehicle U1 transmits the security information with the selected resource.

Vehicles that leave each other receive less valuable information from the other party, because vehicles that are already far away are basically no threat to the vehicle. Therefore, the present embodiment arranges vehicles that are far away from each other to transmit security information in adjacent frequency bands, which is equivalent to dividing communication resources, so that communication resources used between dangerous vehicles (for example, vehicles approaching each other) are different. This can avoid resource conflicts between dangerous vehicles and ensure safe driving.

In addition, there is a half-duplex problem in the LTE-D2D scenario. The prior art improves the transmission success rate by 2 or 4 retransmissions. However, in a V2V scenario, multiple retransmissions will reduce the system in the case of many vehicles. Capacity, affecting the reliability of system security information transmission. The value of receiving the safety information of the other vehicle is small. By arranging the vehicles away from each other in the adjacent frequency band to send the safety information, the safety of the V2V due to the half-duplex problem can be avoided, which can reduce the number of retransmissions. Increase system capacity.

The following is an embodiment of the apparatus of the present invention, which can be used to carry out the method embodiments of the present invention. For details not disclosed in the embodiment of the device of the present invention, please refer to the method embodiment of the present invention.

FIG. 12 is a schematic diagram of a communication resource allocation apparatus according to an exemplary embodiment of the present invention. The device is used in a first terminal, and the device may include:

a target resource pool obtaining unit 1201, configured to acquire a target resource pool, where the target resource pool is determined according to a moving direction of the first terminal;

The resource selection unit 1202 is configured to select a resource in the target resource pool acquired by the target resource pool obtaining unit 1201 to communicate with other terminals.

In this embodiment or some other embodiments of the present invention, the target resource pool obtaining unit 1201 may include:

a first target resource pool determining subunit, configured to determine the target resource pool according to the resource pool allocation information and the moving direction acquired by the direction acquiring subunit 1301, where the resource pool allocation information is used to indicate different motion directions Resource pool.

In this embodiment or some other embodiments of the present invention, the manner in which the direction acquiring subunit acquires the moving direction of the first terminal may include:

Obtained from the application layer; or,

Obtained through its own geolocation information; or,

In this embodiment or some other embodiments of the present invention, the resource pool allocation information may be preset in the first terminal, or the resource pool allocation information may be received from a broadcast of the control device.

The second target resource pool determining subunit is configured to determine the target resource pool according to the indication information received by the indication information receiving subunit 1401.

In this embodiment or some other embodiments of the present invention, the manner in which the resource selection unit selects a resource in the target resource pool may include at least one of the following:

In this embodiment or some other embodiments of the present invention, the direction of the other terminal and the distance from the first terminal may be obtained by:

Obtained from the application layer; or,

Obtained from the security information sent by the other terminal; or,

FIG. 13 is a schematic diagram of a communication resource allocation apparatus according to an exemplary embodiment of the present invention. The apparatus is used to control a device, and the apparatus may include:

The resource pool allocation information broadcast unit 1301 is configured to broadcast resource pool allocation information to the first terminal, so that the first terminal determines a target resource pool for selecting a resource to perform communication according to the direction of the motion and the resource pool allocation information. The resource pool allocation information is used to indicate resource pools corresponding to different motion directions;

or,

The target resource pool sending unit 1302 is configured to acquire a motion direction of the first terminal, and send a target resource pool to the first terminal according to the motion direction, so that the first terminal selects a resource in the target resource pool. Communicate with other terminals.

In this embodiment or some other embodiments of the present invention, the manner in which the target resource pool sending unit 1302 obtains the motion direction of the first terminal may include:

Obtained from the application layer; or,

Obtained from the security information sent by the first terminal; or,

In this embodiment or some other embodiments of the present invention, the apparatus may further include:

a resource pool allocation information determining unit, configured to receive security information broadcasted by each terminal, and determine terminal state information according to the security information, where the terminal state information includes a moving direction of each terminal and a number of terminals in each moving direction, according to the The terminal status information is used to determine the resource pool allocation information.

FIG. 14 is a schematic diagram of a communication resource allocation apparatus according to an exemplary embodiment of the present invention. The apparatus is used in a first terminal, and the apparatus may include:

The terminal set obtaining unit 1401 is configured to acquire a set of terminals whose moving direction is gradually away from the first terminal;

The terminal selection unit 1402 is configured to determine a second terminal in the set of terminals acquired by the terminal set obtaining unit 1701;

The resource selection unit 1403 is configured to select an adjacent frequency band of a frequency band used by the second terminal to communicate with other terminals.

In this embodiment or some other embodiments of the present invention, the determining the second terminal in the set of the terminal may include:

In this embodiment or some other embodiments of the present invention, the acquiring a moving direction is a set of terminals that are gradually away from the first terminal, and may include:

With regard to the apparatus in the above embodiment, the specific manner in which each unit\module performs an operation has been described in detail in the embodiment relating to the method, and will not be explained in detail herein.

Fig. 15 shows a simplified schematic diagram of one possible design structure of the UE involved in the above embodiment. The UE may include, for example, a transmitter 1501, a receiver 1502, a controller/processor 1503, a memory 1504, and a modem processor 1505.

Transmitter 1501 conditions (e.g., analog conversion, filtering, amplifying, upconverting, etc.) the output samples and generates an uplink signal that is transmitted via an antenna to a base station or the like. On the downlink, the antenna receives a downlink signal transmitted by a base station or the like. Receiver 1502 conditions (eg, filters, amplifies, downconverts, digitizes, etc.) the signals received from the antenna and provides input samples. In modem processor 1505, encoder 1506 receives the traffic data and signaling messages to be transmitted on the uplink and processes (e.g., formats, codes, and interleaves) the traffic data and signaling messages. Modulator 1507 further processes (e.g., symbol maps and modulates) the encoded traffic data and signaling messages and provides output samples. Demodulator 1509 processes (e.g., demodulates) the input samples and provides symbol estimates. The decoder 1508 processes (e.g., deinterleaves and decodes) the symbol estimate and provides decoded data and signaling messages that are sent to the UE. Encoder 1506, modulator 1507, demodulator 1509, and decoder 1508 may be implemented by a composite modem processor 1505. These units are based on the wireless access technology used by the radio access network. Processing (eg, access technologies for LTE and other evolved systems) for processing.

The controller/processor 1503 performs control management on the actions of the UE for performing the processing performed by the UE in the above embodiment. For example, it is used to control the UE to acquire a target resource pool, select resources in the target resource pool to communicate with other terminals, and/or other processes of the techniques described herein. As an example, the controller/processor 1503 is configured to support the UE in performing the methods illustrated in FIGS. 2, 3, 4, and 9. The memory 1504 is used to store program codes, data, and the like for the UE.

FIG. 16 is a schematic diagram showing a possible structure of a base station involved in the above embodiment.

The base station includes a transmitter/receiver 1601, a controller/processor 1602, a memory 1603, and a communication unit 1604. The transmitter/receiver 1601 is configured to support the base station to transmit and receive information with the UE in the foregoing embodiment, and to support radio communication between the UE and other UEs. The controller/processor 1602 performs various functions for communicating with the UE. On the uplink, the uplink signal from the UE is received via the antenna, coordinated by the receiver 1601, and further processed by the controller/processor 1162 to recover the traffic data and signaling information transmitted by the UE. On the downlink, traffic data and signaling messages are processed by controller/processor 1602 and mediated by transmitter 1601 to generate downlink signals for transmission to the UE via the antenna.

The controller/processor 1602 also performs the processes involved in the base station of Figures 7 and 8 and/or other processes for the techniques described herein. The memory 1603 is used to store program codes and data of the base station. The communication unit 1604 is configured to support the base station to communicate with other network entities. For example, it is used to receive security information broadcast by each terminal, and to support communication between the base station and other terminals shown in FIG.

It will be appreciated that Figure 16 only shows a simplified design of the base station. In practical applications, the base station may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all base stations that can implement the present invention are within the scope of the present invention.

The controller/processor for performing the above-described base station and UE functions of the present invention may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a field programmable gate array ( FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.

The steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions. The software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art. In the medium. An exemplary storage medium is coupled to the processor such that A processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in the user equipment. Of course, the processor and the storage medium may also reside as discrete components in the user equipment.

Those skilled in the art will appreciate that in one or more examples described above, the functions described herein can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. The scope of the protection, any modifications, equivalent substitutions, improvements, etc., which are made on the basis of the technical solutions of the present invention, are included in the scope of the present invention.

Claims

A communication resource allocation method, wherein the method is used for a first terminal, and the method includes:

Obtaining a target resource pool, where the target resource pool is determined according to a moving direction of the first terminal;

Selecting resources in the target resource pool to communicate with other terminals.
The method according to claim 1, wherein the obtaining a target resource pool comprises:

Obtaining a moving direction of the first terminal;

And determining the target resource pool according to the motion direction and the resource pool allocation information, where the resource pool allocation information is used to indicate a resource pool corresponding to different motion directions.
The method according to claim 2, wherein the obtaining the direction of motion of the first terminal comprises:

Obtained from the application layer; or,

Obtained through its own geolocation information; or,

Receiving a direction of motion of the first terminal sent by the control device.
The method according to claim 2, wherein the resource pool allocation information is preset in the first terminal, or the resource pool allocation information is received from a broadcast of the control device.
The method according to claim 1, wherein the obtaining a target resource pool comprises:

Receiving indication information of the control device for the resource pool;

Determining the target resource pool according to the indication information.
The method according to claim 1, wherein the selecting a resource in the target resource pool comprises at least one of the following:

If there are unoccupied resources in the target resource pool, select unoccupied resources in the target resource pool;

If the resources in the target resource pool are occupied, the resource selected by the second terminal is selected in the target resource pool, and the second terminal is in the same direction as the first terminal in the other terminal. And the farthest terminal.
The method according to claim 6, wherein the direction of the other terminal and the distance from the first terminal are obtained by:

Obtained from the application layer; or,

Obtaining according to the Doppler frequency offset extension of the other terminal; or,

Obtained from the security information sent by the other terminal; or,

The reference signal received power RSRP acquisition is performed by measuring the air interface resources occupied by the other terminals.
The method according to any one of claims 1 to 7, wherein the terminal is a vehicle.
A communication resource allocation method, wherein the method is used to control a device, and the method includes:

Broadcasting the resource pool allocation information to the first terminal, so that the first terminal determines, according to the moving direction of the mobile terminal and the resource pool allocation information, a target resource pool for selecting a resource, where the resource pool allocation information is used to indicate a resource pool corresponding to different directions of motion;

or,

Obtaining the direction of motion of the first terminal,

And transmitting a target resource pool to the first terminal according to the moving direction, so that the first terminal selects a resource in the target resource pool to communicate with other terminals.
The method according to claim 9, wherein the obtaining the direction of motion of the first terminal comprises:

Obtained from the application layer; or,

Obtaining according to the Doppler frequency offset extension of the first terminal; or

Obtained from the security information sent by the first terminal; or,

The reference signal received power RSRP acquisition is performed by measuring the air interface resource occupied by the first terminal.
The method according to claim 9, wherein before the broadcasting resource pool allocation information, the method further comprises:

Receiving security information broadcast by each terminal;

Determining terminal status information according to the security information, where the terminal status information includes a moving direction of each terminal and a number of terminals in each moving direction;

Determining the resource pool allocation information according to the terminal status information.
The method according to any one of claims 9 to 11, wherein the control device is a roadside unit RSU and the terminal is a vehicle.
A communication resource allocation method, wherein the method is used for a first terminal, and the method includes:

Obtaining a set of terminals whose motion direction is gradually away from the first terminal;

Determining a second terminal in the set of terminals;

An adjacent frequency band of a frequency band used for communication by the second terminal is selected to communicate with other terminals.
The method according to claim 13, wherein the determining the second terminal in the set of the terminals comprises:

Determining, in the set of the terminals, a terminal that is closest to the first terminal as the second terminal.
The method according to claim 14, wherein the acquiring the direction of motion is a set of terminals gradually away from the first terminal, including:

Measuring reference signal received power RSRP of the air interface resources occupied by other terminals;

A terminal in which the RSRP is changed from gradually larger to gradually smaller is selected into the set of the terminals.
The method according to claim 15, wherein the determining, by the terminal in the set of the terminal, the terminal that is closest to the first terminal is the second terminal, comprising:

The terminal whose time is the closest to the current time corresponding to the turning point from the gradual change to the gradual change of the RSRP is determined as the second terminal.
A communication resource allocation device, wherein the device is used in a first terminal, and the device includes:

a target resource pool obtaining unit, configured to acquire a target resource pool, where the target resource pool is determined according to a moving direction of the first terminal;

And a resource selection unit, configured to select a resource in the target resource pool acquired by the target resource pool obtaining unit to communicate with other terminals.
The device according to claim 17, wherein the target resource pool obtaining unit comprises:

a direction acquiring subunit, configured to acquire a moving direction of the first terminal;

a first target resource pool determining subunit, configured to determine the target resource pool according to the resource pool allocation information and the direction of motion acquired by the direction acquiring subunit, where the resource pool allocation information is used to indicate that the different motion directions correspond to Resource pool.
The device according to claim 18, wherein the manner in which the direction acquiring subunit acquires the moving direction of the first terminal comprises:

Obtained from the application layer; or,

Obtained through its own geolocation information; or,

Receiving a direction of motion of the first terminal sent by the control device.
The apparatus according to claim 18, wherein the resource pool allocation information is preset in the first terminal, or the resource pool allocation information is received from a broadcast of the control device.
The device according to claim 17, wherein the target resource pool obtaining unit comprises:

An indication information receiving subunit, configured to receive indication information of the control device for the resource pool;

And a second target resource pool determining subunit, configured to determine the target resource pool according to the indication information received by the indication information receiving subunit.
The apparatus according to claim 17, wherein the manner in which the resource selection unit selects a resource in the target resource pool comprises at least one of the following:

If there are unoccupied resources in the target resource pool, select unoccupied resources in the target resource pool;

If the resources in the target resource pool are occupied, the resource selected by the second terminal is selected in the target resource pool, and the second terminal is in the same direction as the first terminal in the other terminal. And the farthest terminal.
The device according to claim 22, wherein the direction of the other terminal and the distance from the first terminal are obtained by:

Obtained from the application layer; or,

Obtaining according to the Doppler frequency offset extension of the other terminal; or,

Obtained from the security information sent by the other terminal; or,

The reference signal received power RSRP acquisition is performed by measuring the air interface resources occupied by the other terminals.
Apparatus according to any one of claims 17 to 23 wherein said terminal is a vehicle.
A communication resource allocation device, wherein the device is used to control a device, and the device includes:

a resource pool allocation information broadcast unit, configured to broadcast resource pool allocation information to the first terminal, so that the first terminal determines, according to the direction of motion and the resource pool allocation information, a target resource pool for selecting a resource to perform communication, The resource pool allocation information is used to indicate resource pools corresponding to different motion directions;

or,

a target resource pool sending unit, configured to acquire a moving direction of the first terminal, and send a target resource pool to the first terminal according to the moving direction, so that the first terminal selects a resource in the target resource pool to Other terminals communicate.
The device according to claim 25, wherein the manner in which the target resource pool sending unit acquires the moving direction of the first terminal comprises:

Obtained from the application layer; or,

Obtaining according to the Doppler frequency offset extension of the first terminal; or

Obtained from the security information sent by the first terminal; or,

The reference signal received power RSRP acquisition is performed by measuring the air interface resource occupied by the first terminal.
The device of claim 25, wherein the device further comprises:

a resource pool allocation information determining unit, configured to receive security information broadcasted by each terminal, and determine terminal state information according to the security information, where the terminal state information includes a moving direction of each terminal and a number of terminals in each moving direction, according to the The terminal status information determines the resource pool allocation information.
Apparatus according to any one of claims 25 to 27, wherein said control device is a roadside unit RSU and said terminal is a vehicle.
A communication resource allocation device, wherein the device is used in a first terminal, and the device includes:

a terminal set obtaining unit, configured to acquire a set of terminals whose moving direction is gradually away from the first terminal;

a terminal selection unit, configured to determine a second terminal in the set of terminals acquired by the terminal set obtaining unit;

And a resource selection unit, configured to select an adjacent frequency band of a frequency band used by the second terminal to communicate with other terminals.
The apparatus according to claim 29, wherein the determining the second terminal in the set of the terminals comprises:

Determining, in the set of the terminals, a terminal that is closest to the first terminal as the second terminal.
The device according to claim 30, wherein the acquiring a moving direction is a set of terminals gradually away from the first terminal, including:

The reference signal received power RSRP of the air interface resource occupied by the other terminal is measured, and the terminal whose RSRP changes from gradually becoming larger to gradually smaller is selected into the set of the terminal.
The device according to claim 31, wherein the determining, by the terminal in the set of the terminal, the terminal that is closest to the first terminal is the second terminal comprises:

The terminal whose time is the closest to the current time corresponding to the turning point from the gradual change to the gradual change of the RSRP is determined as the second terminal.
A terminal, comprising:

At least one processor, configured to acquire a target resource pool, and select a resource in the target resource pool, where the target resource pool is determined according to a moving direction of the terminal;

a transmitter for selecting a resource in the target resource pool according to the at least one processor Communicate with other terminals.
A control device, comprising:

a transmitter, configured to broadcast resource pool allocation information to the terminal, so that the terminal determines, according to the direction of motion of the mobile device and the resource pool allocation information, a target resource pool for selecting a resource, where the resource pool allocation information is used for communication. Indicates a resource pool corresponding to different motion directions, or is used to send a target resource pool to the terminal, so that the terminal selects resources in the target resource pool to communicate with other terminals;

And at least one processor, configured to acquire a motion direction of the terminal before sending the target resource pool to the terminal, and determine the target resource pool according to the motion direction.
A terminal, comprising:

At least one processor, configured to acquire a set of terminals whose motion direction is gradually away from the current terminal, and determine a second terminal in the set of the terminals;

And a transmitter, configured to select an adjacent frequency band of a frequency band used by the second terminal to communicate with other terminals.
A communication system, characterized in that the system comprises the terminal of claim 33 and the control device of claim 34.
A communication system, characterized in that the system comprises at least two terminals as claimed in claim 35.