WO2015113356A1

WO2015113356A1 - Method and apparatus for selecting communication mode, terminal, and base station

Info

Publication number: WO2015113356A1
Application number: PCT/CN2014/079194
Authority: WO
Inventors: 张晨璐; 张云飞
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2014-01-28
Filing date: 2014-06-04
Publication date: 2015-08-06
Also published as: CN103747507A; CN103747507B

Abstract

The present invention provides a method for selecting a communication mode. The method comprises: determining whether a target terminal is located in a D2D communication range corresponding to a current terminal, and/or determining whether a communication state of the current terminal meets a preset condition of establishing D2D communication; and when the target terminal is located in the D2D communication range corresponding to the current terminal and/or when the communication state of the current terminal meets the preset condition, performing, by the current terminal, communication by using a D2D mode, otherwise performing communication by using a non-D2D mode. The present invention also provides an apparatus for selecting a communication mode, a terminal, and a base station. By using the technical schemes of the present invention, an optimal communication mode can be accurately selected, thereby helping to reduce the energy consumption of a terminal, and improving the frequency utilization rate.

Description

Communication mode selection method and selection device, terminal, base station

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method for selecting a communication mode, a device for selecting a communication mode, a terminal, and a base station. Background technique

In the related art, a communication mode is proposed, that is, direct communication between a terminal and a terminal

(Device to Device, D2D communication), so that data packets can be transmitted directly between terminals without any intermediate infrastructure (such as base stations, core networks, etc.), or only through relays such as base stations or other terminals. To achieve a longer transmission distance.

However, for various application scenarios, how to determine whether the terminal should use the D2D mode for communication or to communicate in the traditional non-D2D mode has become a technical problem to be solved. Summary of the invention

The invention is based on the above problems, and proposes a new technical solution, which can accurately select an optimal communication mode, thereby contributing to saving terminal energy consumption and improving frequency utilization.

In view of this, the present invention provides a method for selecting a communication mode, including: determining whether a target terminal is located in a D2D communication range corresponding to a current terminal, and/or determining whether a communication state of the current terminal satisfies a pre-establishment of D2D communication. Setting the condition; when the target terminal is located in the D2D communication range corresponding to the current terminal, and/or the communication state of the current terminal meets the preset condition, the current terminal uses the D2D mode to communicate, otherwise通信 Communicate in a non-D2D mode.

In this technical solution, by determining whether the target terminal is within the D2D communication range corresponding to the current terminal, it may be determined whether the current terminal has the possibility of establishing D2D communication with the target terminal. Specifically, if it is in the D2D communication range, it can be transmitted through the D2D mode. Letter, otherwise it can only communicate through non-D2D mode due to distance problem. The non-D2D method refers to a mobile communication method such as 2G, 3G or 4G.

By judging the communication status of the current terminal, it can be determined whether the current terminal needs to communicate using the D2D mode, that is, the necessity of selecting the D2D mode. Specifically, if the communication state of the current terminal is more suitable for applying the D2D mode for communication, for example, the D2D mode helps to obtain better communication quality, lower power consumption, and the like.

In a more preferred implementation manner, whether the target terminal is in the D2D communication range corresponding to the current terminal and whether the communication state of the current terminal is applicable to the D2D communication may be simultaneously determined, thereby ensuring that the terminal implements reasonable selection and optimality. Communication experience. Of course, those skilled in the art should understand that it is obvious that only one of the above two judging processes can be judged, thereby verifying the possibility and necessity of the current terminal to communicate using the D2D mode.

In the above technical solution, the determining whether the target terminal is located in the D2D communication range corresponding to the current terminal specifically includes: a precise positioning step, configured to acquire accurate location information of the current terminal and the target terminal, and calculate An actual distance and/or a path fading value between the current terminal and the target terminal; wherein, when the actual distance is less than or equal to a preset distance threshold, and/or the path fading value is less than or equal to the pre- When the fading threshold is set, it is determined that the target terminal is located in a D2D communication range corresponding to the current terminal.

In the technical solution, by obtaining the accurate location information of the current terminal and the target terminal, the positional relationship between the two can be accurately determined, thereby determining the possibility that the current terminal communicates using the D2D mode. Specifically, the D2D communication range corresponding to the current terminal may be directly represented by a distance. For example, when the target terminal is located within a certain distance of the current terminal, it is determined to be in the D2D communication range; and the current terminal may be indirectly represented by other parameter values. The distance from the target terminal, for example, more specifically, can be represented by the path fading value, so that when the path fading value is small, it indicates that the distance between the two is relatively close, otherwise the distance is far.

Specifically, the accurate location information of the current terminal and the target terminal may be measured by the current terminal and the target terminal through the measurement, such as GPS, A-GPS, etc., to the network side, or may be directly measured by the network side. In the above technical solution, preferably, before the step of accurately positioning, the method further includes: a pre-positioning step, configured to acquire, by the current terminal, or a network-side maintained neighboring terminal database corresponding to the current terminal, And/or acquiring area information in which the current terminal and the target terminal are respectively located; wherein, when the target terminal is found in the neighboring terminal database, and/or the current terminal and the target terminal When in the same area, the precise positioning step is performed, otherwise it is determined that the target terminal is not in the D2D communication range corresponding to the current terminal.

In this technical solution, since the precise data requires a long measurement time in the process of precise positioning, the user may wait too long, so that a relatively simple pre-positioning process can be adopted, in a more rough but quick manner. Realizing the determination of the positional relationship between the current terminal and the target terminal, so that when the D2D communication cannot be realized between the two, the waiting time of the user can be effectively reduced, and since the pre-positioning process itself takes a short time, even if it is still Need to perform precise positioning, and will not make the user's waiting time too long.

The current terminal and/or the network side can maintain the neighboring terminal database, that is, the terminal existing around the current terminal, which may be obtained by the current terminal itself and/or the network side (the current terminal and/or the network side may periodically Or the event triggering method, measuring the terminal existing around the current terminal, and updating to the neighboring terminal database maintained by the terminal, so that the real-time measurement is not required, so that the target terminal can be determined to be in the current terminal in a short time. Within the scope of D2D communication.

Alternatively, after the current terminal and the target terminal are measured, or the network side performs measurement, the rough location information of the current terminal and the target terminal is determined, for example, whether the two are in the same area, to determine whether the target terminal is in the current terminal. Within the D2D communication range. The coarse location information may be a connected base station ID, a cell ID, and/or a tracking area ID, etc., to determine whether the two are in the same cell, sector, tracking area, and the like.

In the above technical solution, preferably, the method further includes: when the actual distance is less than or equal to a preset first distance threshold, and/or the path fading value is less than or equal to a preset first fading threshold, Determining that the current terminal and the target terminal communicate by using a direct D2D mode; when the actual distance is greater than a preset first distance threshold and less than or equal to a preset second distance threshold, and/ Or the path fading value is greater than a preset first fading threshold and less than or equal to When the preset second fading threshold is used, it is determined that the current terminal and the target terminal communicate by using a relay-based D2D mode.

In the technical solution, based on the precise positioning manner, the D2D mode specifically used by the current terminal and the target terminal may also be determined, for example, when the distance between the current terminal and the target terminal is close and/or the communication quality is good enough. Direct D2D communication between the current terminal and the target terminal, that is, direct D2D mode; or, relay-based D2D communication between the current terminal and the target terminal, so that between the current terminal and the target terminal When the distance is long and/or the communication quality is not good enough, relaying can be used to achieve farther and more stable D2D communication. The relay may be implemented by a base station, a mobile base station, or other terminal.

In any one of the foregoing technical solutions, the determining, by the determining, whether the communication state of the current terminal meets the preset condition for establishing the D2D communication, specifically includes: an accurate determining step, configured to measure the current terminal and the target terminal The channel condition between the two, when the channel condition satisfies the preset channel condition, determining that the communication state of the current terminal satisfies the preset condition.

In this technical solution, the necessity judgment of D2D communication can be realized by accurately measuring the channel condition between the current terminal and the target terminal. Specifically, when the channel condition is good, it indicates that higher quality D2D communication can be implemented between the current terminal and the target terminal, and the current terminal achieves a lower level of power consumption loss, thereby allowing the current terminal to communicate in the D2D mode. When the channel condition is poor, it may affect the quality of D2D communication, and for the current terminal, it may also cause high power loss, so it should be considered to use non-D2D mode for communication.

In the foregoing technical solution, preferably, the measuring the channel quality specifically includes: the current terminal sending a specific pilot signal or a training sequence to the target terminal, and/or the current terminal receiving the target terminal The specific pilot signal or training sequence; wherein, when a signal receiving quality of the specific pilot signal or training sequence is greater than or equal to a preset receiving quality threshold, and/or the specific pilot signal or When the signal receiving strength of the training sequence is greater than or equal to the preset receiving strength threshold, it is determined that the communication state of the current terminal satisfies the preset condition.

In the technical solution, it is specifically proposed to measure the corresponding receiving quality and/or intensity by transmitting the pilot signal and/or the training sequence to accurately determine the current terminal. The channel condition with the target terminal to determine whether the current terminal should communicate in D2D mode.

In the above technical solution, preferably, before the step of the precise decision, the method further includes: a pre-decision step, configured to acquire first state information of the current terminal and/or a second network side corresponding to the current terminal State information; wherein, when the first state information and/or the second state information meets a corresponding state condition, performing the precise decision step, otherwise determining that the communication state of the current terminal does not satisfy the preset condition.

In this technical solution, since the measurement of the channel condition is relatively accurate and the transmission and measurement of the pilot signal and/or the training sequence need to be performed, it takes a long time. Therefore, according to the first state information of the current terminal and/or the second state information of the corresponding network side, a relatively coarse but fast communication state determination can be implemented, so that when D2D communication cannot be realized between the two, the effective reduction can be effectively reduced. The waiting time of the user, and because the pre-judgment process itself is very short, so even if it is still necessary to perform an accurate decision, the user's waiting time will not be too long.

In the foregoing technical solution, the first state information includes at least one of the following or a combination thereof: the real-time power of the current terminal; the real-time power consumption of the current terminal; and the current terminal-to-D2D communication function. a support status of the D2D communication function of the current terminal in the case of supporting the D2D communication function; and/or the second status information includes at least one of the following or a combination thereof: resources of the wireless link Utilization; resource load status of the wireless link; resource utilization of the backhaul link; resource load status of the backhaul link; core network data plane nodes (eg, S-GW, Serving Gateway) and/or signaling plane nodes The load situation (such as MME, Mobility Management Entity).

In the above technical solution, preferably, the method further includes: determining that the current terminal and the target terminal use a direct D2D mode to communicate when the channel condition is better than a preset first channel condition; When the channel condition is better than the preset second channel condition and is inferior to the preset first channel condition, determining that the current terminal and the target terminal use the relay-based D2D mode for communication.

In the technical solution, the D2D mode specifically used by the current terminal and the target terminal may be determined based on the precise decision manner, for example, when the channel condition between the current terminal and the target terminal is good, the current terminal and Direct D2D communication between target terminals, ie Direct D2D mode; or, it is also possible to implement relay-based D2D communication between the current terminal and the target terminal, so that when the channel condition between the current terminal and the target terminal is poor, it can be further realized by relaying, More stable D2D communication. The relay may be implemented by a base station, a mobile base station, or other terminal.

The present invention also provides a communication mode selection device, including: a location determination unit and/or a condition determination unit, wherein the location determination unit is configured to determine whether the target terminal is located in a D2D communication range corresponding to the current terminal, and the condition determination The unit is configured to determine whether the communication status of the current terminal meets a preset condition for establishing D2D communication; and the selecting unit is configured to: when the target terminal is located in a D2D communication range corresponding to the current terminal, and/or the current terminal When the communication state satisfies the preset condition, the current terminal is controlled to select the D2D mode for communication, otherwise, the non-D2D mode is used for communication.

In this technical solution, by determining whether the target terminal is within the D2D communication range corresponding to the current terminal, it can be determined whether the current terminal has the possibility of establishing D2D communication with the target terminal. Specifically, if it is in the D2D communication range, communication can be performed by D2D mode. Otherwise, communication can only be performed by non-D2D mode due to the distance problem. Non-D2D mode refers to mobile communication methods such as 2G, 3G or 4G.

In the above technical solution, the location determining unit includes: a precise positioning subunit, configured to acquire accurate location information of the current terminal and the target terminal, and calculate the current terminal and the target terminal Actual distance and/or path fading value; When the actual distance is less than or equal to the preset distance threshold, and/or the path fading value is less than or equal to the preset fading threshold, it is determined that the target terminal is located in the D2D communication range corresponding to the current terminal.

Specifically, the accurate location information of the current terminal and the target terminal may be measured by the current terminal and the target terminal through the measurement, such as GPS, A-GPS, etc., to the network side, or directly by the network side.

In the foregoing technical solution, the location determining unit further includes: a pre-location sub-unit, configured to acquire a neighbor terminal database that is maintained by the current terminal or maintained by the network side and corresponds to the current terminal, and/or Obtaining area information of the current terminal and the target terminal respectively; wherein, when the target terminal is found in the neighboring terminal database, and/or the current terminal is in the same area as the target terminal The internal positioning unit is activated, otherwise it is determined that the target terminal is not in the D2D communication range corresponding to the current terminal.

The current terminal and/or the network side can maintain the neighboring terminal database, that is, the terminal existing around the current terminal, which may be obtained by the current terminal itself and/or the network side (the current terminal and/or the network side may periodically Or event-triggered way, around the current terminal The existing terminals perform measurements and update to the respective maintained neighbor terminal databases, so that since real-time measurement is not required, it is possible to determine whether the target terminal is within the D2D communication range corresponding to the current terminal in a short time.

In the above technical solution, preferably, the selecting unit is further configured to: when the actual distance is less than or equal to a preset first distance threshold, and/or the path fading value is less than or equal to a preset first When the fading threshold is determined, determining that the current terminal and the target terminal communicate by using a direct D2D mode; when the actual distance is greater than a preset first distance threshold and less than or equal to a preset second distance Determining between the current terminal and the target terminal based on the threshold value, and/or the path fading value is greater than a preset first fading threshold and less than or equal to a preset second fading threshold Follow the D2D mode for communication.

In any one of the foregoing technical solutions, the condition determining unit includes: a precision determining subunit, configured to measure a channel condition between the current terminal and the target terminal, when the channel condition meets a preset channel When the condition is met, it is determined that the communication state of the current terminal satisfies the preset condition.

In this technical solution, the necessity judgment of the D2D communication can be realized by accurately measuring the channel condition between the current terminal and the target terminal. Specifically, when the channel condition is good, it indicates that higher quality D2D communication can be achieved between the current terminal and the target terminal. And the current terminal achieves a lower level of power loss, thereby allowing the current terminal to communicate in the D2D mode; and when the channel condition is poor, the quality of the D2D communication may be affected, and for the current terminal, it may also be caused. High power loss, so you should consider using non-D2D mode for communication.

In the foregoing technical solution, preferably, the precision determining subunit is configured to: control the current terminal to send a specific pilot signal or a training sequence to the target terminal, and/or control the current terminal to receive from the The specific pilot signal or training sequence of the target terminal; wherein, when the signal receiving quality of the specific pilot signal or training sequence is greater than or equal to a preset receiving quality threshold, and/or the specific guide When the signal receiving strength of the frequency signal or the training sequence is greater than or equal to the preset receiving strength threshold, it is determined that the communication state of the current terminal satisfies the preset condition.

In the technical solution, specifically, the pilot signal and/or the training sequence are transmitted, so that the corresponding receiving quality and/or intensity are measured to accurately determine the channel condition between the current terminal and the target terminal. Therefore, it is determined whether the current terminal should communicate in the D2D mode.

In the above technical solution, the condition determining unit further includes: a pre-decision sub-unit, configured to acquire first state information of the current terminal and/or second state information of the network side corresponding to the current terminal When the first state information and/or the second state information meet the corresponding state condition, the precision decision subunit is activated, otherwise it is determined that the communication state of the current terminal does not satisfy the preset condition. .

In the foregoing technical solution, the first state information includes at least one of the following or a combination thereof: the real-time power of the current terminal; the real-time power consumption of the current terminal; and the current terminal-to-D2D communication function. Support status; in case of supporting the D2D communication function And the second state information includes at least one of the following or a combination thereof: resource utilization of the wireless link; resource load state of the wireless link; Resource utilization of the link; resource load status of the backhaul link; load of the core network data plane node (such as SGW) and/or signaling plane node (such as MME).

In the above technical solution, preferably, the selecting unit is further configured to: when the channel condition is better than a preset first channel condition, determine that a direct D2D is used between the current terminal and the target terminal. The method performs communication; when the channel condition is better than the preset second channel condition and is inferior to the preset first channel condition, determining that the relay-based D2D mode is used between the current terminal and the target terminal Communicate.

In the technical solution, the D2D mode specifically used by the current terminal and the target terminal may be determined based on the precise decision manner, for example, when the channel condition between the current terminal and the target terminal is good, the current terminal and Direct D2D communication between target terminals, that is, direct D2D mode; or, relay-based D2D communication between the current terminal and the target terminal, so that when the channel condition between the current terminal and the target terminal is poor , can achieve further and more stable D2D communication through relay. The relay may be implemented by a base station, a mobile base station, or other terminal.

The present invention also provides a terminal, comprising: the selection device of the communication mode according to any one of the above technical solutions.

The present invention also provides a base station, comprising: the selection device of the communication mode according to any one of the above technical solutions.

Through the above technical solutions, the optimal communication mode can be accurately selected, thereby contributing to saving terminal energy consumption and improving frequency utilization. DRAWINGS

1 is a schematic flow chart showing a method of selecting a communication mode according to an embodiment of the present invention;

2 is a schematic flow chart of a terminal position determining process in a method for selecting a communication mode in the embodiment shown in FIG. 1;

3 is a communication state determination process in a method for selecting a communication mode of the embodiment shown in FIG. 1. Schematic flow chart;

4 is a schematic flow chart showing selection of a communication mode of a terminal according to an embodiment of the present invention;

5A through 5C illustrate diagrams of switching communication modes in accordance with one embodiment of the present invention;

6A to 6B are diagrams showing a switching communication mode according to another embodiment of the present invention;

7A through 7B are diagrams showing a switching communication mode according to still another embodiment of the present invention;

Figure 8 is a schematic block diagram showing a selection mode of a communication mode according to an embodiment of the present invention;

Figure 9 shows a schematic block diagram of a terminal in accordance with one embodiment of the present invention;

Figure 10 shows a schematic block diagram of a base station in accordance with one embodiment of the present invention. detailed description

The above described objects, features and advantages of the present invention will be more fully understood from the following detailed description. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention, but the invention may be practiced in other embodiments other than those described herein. Limitations of specific embodiments.

Fig. 1 shows a schematic flow chart of a method of selecting a communication mode in accordance with one embodiment of the present invention.

As shown in FIG. 1, a method for selecting a communication mode according to an embodiment of the present invention includes:

Step 102: Determine whether the target terminal is located in the D2D communication range corresponding to the current terminal, and/or determine whether the communication status of the current terminal meets a preset condition for establishing D2D communication. Step 104: When the target terminal is located in the current The current terminal is within the D2D communication range corresponding to the terminal, and/or the communication state of the current terminal satisfies the preset condition 通信 Use D2D mode for communication, otherwise use non-D2D mode for communication.

In step 102, the information determination of the terminal includes two aspects: On one hand, determining whether the target terminal is located in the D2D communication range corresponding to the current terminal; on the other hand, determining whether the communication state of the current terminal satisfies the preset for establishing the D2D communication. condition. The above two aspects will be described in detail below with reference to FIG. 2 and FIG. 3 respectively.

First, position information judgment

1, the step process

Fig. 2 is a schematic flow chart showing the terminal position judging process in the method of selecting the communication mode of the embodiment shown in Fig. 1.

As shown in FIG. 2, the process of determining the location of the terminal may include:

Step 202, a pre-positioning step;

Specifically, acquiring a neighboring terminal database that is maintained by the current terminal or maintained by the network side and corresponding to the current terminal, and/or acquiring area information of the current terminal and the target terminal respectively; Finding the target terminal in the adjacent terminal database, and/or When the current terminal is in the same area as the target terminal, the precise positioning step is performed, otherwise it is determined that the target terminal is not in the D2D communication range corresponding to the current terminal.

In this technical solution, the current terminal and/or the network side may each maintain a neighboring terminal database, that is, a terminal existing around the current terminal, which may be acquired by the current terminal itself and/or the network side (current terminal and/or network side) The terminal existing around the current terminal can be measured in a periodic or event-triggered manner and updated to the neighboring terminal database maintained by the terminal, so that the real-time measurement is not required, so that the target terminal can be determined in a short time. It is within the D2D communication range corresponding to the current terminal.

Step 204, the precise positioning step.

Specifically, acquiring accurate location information of the current terminal and the target terminal, and calculating an actual distance and/or a path fading value between the current terminal and the target terminal; wherein, when the actual distance is less than or When the preset distance threshold is equal to, and/or the path fading value is less than or equal to the preset fading threshold, it is determined that the target terminal is located in the D2D communication range corresponding to the current terminal.

Specifically, the accurate location information of the current terminal and the target terminal may be measured by the current terminal and the target terminal by using, for example, GPS, A-GPS, etc., after being measured to the network side, or by the network. The measurement is performed directly on the network side.

It should be noted that, because step 204, that is, the precise positioning step, the positional relationship between the current terminal and the target terminal can be accurately determined, and step 204 can be used without performing step 202.

However, due to the long measurement time required for accurate data in the process of precise positioning, the user may wait too long, so that the current terminal can be realized in a more rough but quick manner through a relatively simple pre-positioning process. The determination of the positional relationship with the target terminal, so that when D2D communication cannot be realized between the two, the waiting time of the user can be effectively reduced, and since the pre-positioning process itself takes a short time, even if precise positioning is still required , it will not make the user's waiting time too long.

2, mode judgment

In the above technical solution, preferably, the method further includes: when the actual distance is less than or equal to a preset first distance threshold, and/or the path fading value is less than or equal to a preset first fading threshold, Determining that the current terminal and the target terminal communicate by using a direct D2D mode; when the actual distance is greater than a preset first distance threshold and less than or equal to a preset second distance threshold, and/ Or determining that the current terminal and the target terminal are in a relay-based D2D manner when the path fading value is greater than a preset first fading threshold and less than or equal to a preset second fading threshold Communication.

Second, the status information judgment

1, the step process

FIG. 3 is a schematic flow chart showing a communication state judging process in the method for selecting a communication mode of the embodiment shown in FIG. As shown in FIG. 3, the process of determining the communication state of the terminal may include:

Step 302, a pre-decision step.

Specifically, the first state information of the current terminal and/or the second state information of the network side corresponding to the current terminal are obtained; wherein, when the first state information and/or the second state information meets the corresponding The accurate decision step is performed when the state condition is met, otherwise it is determined that the communication state of the current terminal does not satisfy the preset condition.

Preferably, the first status information includes at least one of the following or a combination thereof:

The real-time power of the current terminal;

Real-time power consumption of the current terminal;

The current terminal support status of the D2D communication function;

In the case of supporting the D2D communication function, an open state of the D2D communication function of the current terminal;

And/or the second status information includes at least one of the following or a combination thereof:

Resource utilization of the wireless link;

The resource load status of the wireless link;

Resource utilization of the backhaul link;

Return the resource load status of the link;

The load of the core network data plane nodes (such as S-GW, Serving Gateway) and / or signaling plane nodes (such as MME, Mobility Management Entity).

Step 304, an accurate decision step.

Specifically, a channel condition between the current terminal and the target terminal is measured, and when the channel condition satisfies a preset channel condition, determining that a communication state of the current terminal satisfies the preset condition.

In this technical solution, the necessity judgment of the D2D communication can be realized by accurately measuring the channel condition between the current terminal and the target terminal. Specifically, when the channel condition is good, it indicates that higher quality D2D communication can be implemented between the current terminal and the target terminal, and the current terminal achieves a lower level of power consumption loss, thereby allowing the current terminal to communicate in the D2D mode. When the channel condition is poor, it may affect the quality of D2D communication, and for the current terminal, it may also cause high power loss, so you should consider using non-D2D. Way to communicate.

It should be noted that it takes a long time because the measurement of the channel condition is relatively accurate and the transmission and measurement of the pilot signal and/or the training sequence need to be performed. Therefore, according to the first state information of the current terminal and/or the second state information of the corresponding network side, a relatively coarse but fast communication state determination can be implemented, so that when D2D communication cannot be realized between the two, the effective reduction can be effectively reduced. The waiting time of the user, and because the pre-judgment process itself is very short, so even if it is still necessary to perform an accurate decision, the user's waiting time will not be too long.

2, mode judgment

In the technical solution, the D2D mode specifically used by the current terminal and the target terminal may be determined based on the precise decision manner, for example, when the channel condition between the current terminal and the target terminal is good, the current terminal and Direct D2D communication between target terminals, that is, direct D2D mode; or, relay-based D2D communication between the current terminal and the target terminal, so that when the channel condition between the current terminal and the target terminal is poor , can Faster, more stable D2D communication through relaying. The relay may be implemented by a base station, a mobile base station, or other terminal.

In conjunction with the various process steps described above, Figure 4 illustrates a schematic flow diagram for selecting a communication mode for a terminal in accordance with one embodiment of the present invention.

As shown in FIG. 4, the process of selecting a communication mode of a terminal according to an embodiment of the present invention includes three stages, each of which is described in detail below.

Phase 1: Pre-judgment

Step 402A, position pre-judgment.

Specifically, there are two implementations:

1. Judging based on existing location information

1) It is assumed that the current terminal that initiates the communication request is UE1, and the target terminal that UE1 needs to communicate is UE2.

UE1 maintains a "neighbor UE database" (specifically, it can be maintained by an upper layer application in UE1), and the terminal information about UE1 is recorded in the database. The UE1 may update the "neighbor UE database" according to a preset period or event triggering manner, for example, the preset period may be 30 minutes, and the triggering event may be after each communication end.

Specifically, the UE1 may determine the surrounding terminal by transmitting specific probe signaling to the surroundings to respond to the response of the surrounding terminal.

Therefore, when UE1 needs to initiate a new communication, it can directly query the "neighbor UE database" maintained by itself, and when UE2 is located in the "neighbor UE database", it is determined that UE2 is in the D2D communication range corresponding to UE1, that is, Both can perform D2D communication.

Certainly, the neighboring UE database maintained by the UE1 may also be uploaded to the network side, so that the network side determines whether the UE2 is in the D2D communication range corresponding to the UE1, and notifies the UE1.

2) The "neighbor UE database" for UE1 can be maintained by the network side. Specifically, for example, after the UE1 sends the specific probe signaling to perform the measurement, the measurement result is notified to the network side to implement the maintenance of the terminal information around the UE1; or, for example, the UE1 may directly establish a connection with the UE1 and the like. The terminal performs location acquisition to determine a terminal that is located around UE1, and in particular, may acquire a terminal that is in the same 'area or the same sector as UE1, for It is the terminal around UE1.

Based on the neighboring UE database maintained by the network side, the network side can directly determine the location relationship between UE2 and UE1. Alternatively, the network side can inform the UE1 of the "neighboring UE database", so that UE1 can determine its own relationship with UE2. Positional relationship.

In the above various judgment methods, since the "neighboring UE database" acquired and maintained in advance is used for position determination, and real-time location information acquisition is not required, the UE 1 and the UE 1 can be obtained in a short time. A coarse positional condition between UE2 to achieve fast location acquisition and D2D capability determination.

2. Judgment based on real-time location information

Since the content in the "neighbor UE database" has a certain delay, it may affect the judgment accuracy of the location relationship between UE1 and UE2 to a certain extent. Therefore, the location information of UE1 and UE2 can be acquired in real time.

Of course, the pre-judgment of the location of UE1 and UE2 needs to be completed in a short time, so that only the coarse location information of both can be obtained. For example, the cell ID, the tracking area ID, the connected base station ID, and the like, where UE1 and UE2 are located, may be acquired by the network side, so that when both are in the same cell or tracking area, or connected to the same base station, UE2 is considered to be in UE1 corresponds to the D2D communication range.

Step 402B, the communication status is pre-judged.

Specifically, the communication state can be judged from any or both of the following aspects.

1, terminal status

The state of the terminal may include the state of UE1 and/or the state of UE2. Specifically, the terminal state may include at least one of the following or a combination thereof:

The real-time power of the current terminal, for example, when the real-time power of UE1 and/or UE2 is less than a preset threshold, the D2D communication mode is preferentially applied;

The real-time power consumption of the current terminal, for example, when the real-time power consumption of UE1 and/or UE2 is less than a preset threshold, the D2D communication mode is preferentially applied;

The current terminal supports the D2D communication function, for example, when the UE 1 and the UE 2 support the D2D communication function, the D2D communication mode is preferentially applied;

In the case of supporting the D2D communication function, the D2D communication function of the current terminal The open state, for example, when UE1 and UE2 have enabled the D2D communication function, the D2D communication mode is preferentially applied.

2, network status

The network status, that is, the status of the network side that establishes a connection with UE1, may include at least one of the following or a combination thereof:

The resource utilization and/or resource load status of the wireless link, for example, when the resource utilization and/or resource load status of the wireless link is greater than the threshold L1, the direct D2D communication mode is preferentially applied, and when the value is less than the threshold L2 When the priority is applied to the relay D2D communication mode or the traditional communication mode (L2 < L1);

The resource utilization and/or resource load status of the backhaul link, for example, when the resource utilization and/or resource load status of the backhaul link is greater than the threshold K1, the D2D communication mode is preferentially applied, and when the threshold is less than the threshold In K2, the traditional communication mode (K2 K1) is applied preferentially;

It should be noted that step 402A and step 402B belong to two aspects of pre-judgment, and there is no necessary coupling relationship or sequence between the two, that is, step 402A may be performed first, then step 402B may be performed first, or may be performed first. Step 402B, after step 402A is performed, and in the step of performing first, when it is determined that UE1 and UE2 are not suitable for applying D2D mode for communication, the latter step may be omitted, and the non-D2D mode may be directly used for communication.

Step 404: Determine whether the pre-judgment is passed. If yes, proceed to the second stage re-judgement process, otherwise proceed directly to step 410A.

If, in any step of step 402A or step 402B, it is determined that UE1 and UE2 are not suitable for communication using the D2D mode, it may be determined that the communication is not passed, and only when both steps are determined to be suitable for communication using the D2D mode, It is judged as passing to shorten the waiting time of the user; or, when it is determined that it is suitable for communication using the D2D method at any step, it is determined to be passed, thereby avoiding erroneous determination.

Second stage: judge again

Step 406A, the position is judged again.

Specifically, the positioning module on the terminal such as UE1 and UE2 can perform precise positioning, The location information is obtained by using GPS, A-GPS, Beidou positioning system, etc., for accurate judgment of the positional relationship between UE1 and UE2.

In a specific implementation manner, after acquiring the location information of the UE2, the UE1 may determine the location relationship between the two in the distance. In another specific implementation manner, the UE1 and the UE2 may respectively set their own location information. After the upper 4艮 to the network side, the location information of the two is compared by the network side to determine the positional relationship between the two.

Further, based on the above-mentioned precise location information, UE1 or the network side may also calculate a path fading value between UE1 and UE2 to determine whether the two are suitable for communication by D2D mode.

Step 406B, the communication state is judged again.

A specific pilot signal and/or training sequence may be transmitted by UE1 to UE2, thereby measuring the reception quality and/or reception strength of the signal by UE2, and notifying UE1 and/or the network side to be UE1 and/or the network side. It is judged and it is determined whether the signal condition between UE1 and UE2 is suitable for D2D communication.

Alternatively, the UE2 may send the specific pilot signal and/or the training sequence to the UE1, so that the UE1 measures the receiving quality and/or the receiving strength of the signal, and determines the signal status by itself or reports it to the network side. And judged by the network side.

Step 408: Determine whether to pass the determination again. If yes, enter the mode selection process of the third stage, otherwise proceed directly to step 410A.

If, in any step of step 406A or step 406B, it is determined that UE1 and UE2 are not suitable for communication using the D2D mode, it may be determined that the communication is not passed, and only when both steps are determined to be suitable for communication using the D2D mode, It is judged as passing to shorten the waiting time of the user; or, when it is determined that it is suitable for communication using the D2D method at any step, it is determined to be passed, thereby avoiding erroneous determination.

Phase III: Mode Selection

1. Traditional communication mode

In step 410A, if the UE2 and the UE2 are not applicable to the D2D communication, the traditional communication mode may be applied between the two, that is, the data between the UE1 and the UE2 is implemented by the base station, the S-GW/MME, and the like. Signaling interaction. 2, direct D2D communication mode

Step 410B, based on the judgment result of the location and/or the communication state, for example, the distance between UE1 and UE2 is relatively close, and/or the channel condition between UE1 and UE2 is good, etc., and may be directly performed between UE1 and UE2. D2D communication, and no relay is required for signal forwarding.

More specifically, for example, for the positional relationship, assuming that the distance between the UE1 and the UE2 and/or the path fading value is less than or equal to the preset first distance threshold, it is determined that the direct D2D communication mode can be used; and for the communication state, the assumption is made. The channel condition between UE1 and UE2 is better than the preset first channel condition, and it is determined that the direct D2D communication mode can be used.

Wherein, it is determined that UE1 and UE2 use the direct D2D communication mode in the case where either or both of the "positional relationship" and the "communication state" satisfy the above conditions.

3, relay D2D communication mode

Step 410C, based on the judgment result of the location and/or the communication state, for example, the distance between UE1 and UE2 is relatively long, or the base station, the mobile base station or other terminal may be used as a relay although the distance is relatively close but the channel condition is not ideal. A relay-based D2D communication between UE1 and UE2 is implemented to extend the communication distance and optimize the channel condition by the relay.

More specifically, for example, for the positional relationship, it is assumed that the distance between the UE1 and the UE2 and/or the path fading value is greater than the preset first distance threshold and less than or equal to the preset second distance threshold (the first distance threshold) If it is smaller than the second distance threshold, it is determined that the relay D2D communication mode can be used; and for the communication state, it is assumed that the channel condition between UE1 and UE2 is worse than the preset first channel condition but better than the preset second channel. The condition (the first channel condition is better than the second channel condition) determines that the relay D2D communication mode can be used.

Wherein, it is determined that UE1 and UE2 use the relay D2D communication mode in the case where either or both of the "positional relationship" and the "communication state" satisfy the above conditions.

The present invention proposes a technical solution for selecting a communication mode of a terminal, wherein the specific communication mode used is determined by judging the location information, the communication state, and the like between the current terminal and the target terminal. It should be noted that the foregoing technical solution can be applied to the initial establishment process of the communication, and can also be applied to the mode switching process after the communication has been established, that is, the process shown in FIG. 2 to FIG. 4 can be triggered when the new service is initiated. Therefore, the appropriate data path is selected for the new service; it can also be triggered by the existing service occurrence process to ensure the seamless lossless mode of the existing service. Switching.

For the mode switching process after the communication has been established, continuous monitoring of the status of both parties is required. The following describes the specific application scenarios based on the present invention in detail by using various embodiments.

Embodiment 1

5A through 5C illustrate diagrams of switching communication modes in accordance with one embodiment of the present invention.

As shown in Fig. 5A, based on the position determination of UE1 and UE2, it is assumed that the distance between the two is smaller than the threshold A.

And/or based on the state judgments of UE1 and UE2, assuming that UE1 receives the measurement pilot/search pilot reception strength or signal quality from UE2 is greater than threshold B, and the base station radio resource load and/or usage rate is greater than threshold L, And/or the load and/or resource usage of the eNB to the S-GW (not shown) is greater than the threshold K.

Therefore, based on the above judgment, the direct D2D communication mode can be used between UE1 and UE2.

As shown in Figure 5Β, through continuous measurement, the distance between UE1 and UE2 is detected to be greater than the threshold C ( C > A ) and less than the threshold D ( D > C ), and both are the same. In the cell, the communication mode of UE1 and UE2 can be switched to the relay D2D communication mode, that is, the D2D communication mode in which the eNB is the relay.

As shown in FIG. 5C, by continuously measuring, it is detected that the distance value between UE1 and UE2 is greater than the threshold E (E > D), and the two are in different cells; and/or the backhaul is detected. If the load value of the link is lower than the threshold K, the communication mode of UE1 and UE2 can be switched to the traditional communication mode.

Embodiment 2

6A to 6B are diagrams showing a switching communication mode according to another embodiment of the present invention.

As shown in FIG. 6A, it is assumed that both UE1 and UE2 are in the coverage of the base station eNB, and the communication relationship is established between the UE1 and the UE2 through the legacy mode, that is, the UE1 and the UE2 implement data and/or through the eNB, the S-GW/MME, and/or Signaling interaction. As shown in FIG. 6B, UE1 and UE2 are continuously detected, assuming that the distance between the two UEs is detected to be less than the threshold A, and/or the UE1 receives the received pilot strength or signal of the measurement pilot/search pilot from the UE2. If the quality is greater than the threshold B (or UE2 receives the pilot signal from UE1), the communication modes of UE1 and UE2 can be switched to the direct D2D communication mode.

At the same time, based on the direct D2D communication mode described above, even if UE1 and UE2 leave the coverage of the eNB, smooth communication between the two can be ensured. In addition, the user corresponding to UE1 and UE2 can be kept within a certain range by prompting such as interface, voice, etc., to ensure the smooth progress of the communication process.

Embodiment 3

7A through 7B are diagrams showing a switching communication mode in accordance with still another embodiment of the present invention.

As shown in FIG. 7A, it is assumed that UE1 and UE2 are in the coverage of the base stations eNB1 and eNB2, respectively, and the communication relationship is established between the UE1 and the UE2 through the legacy mode, that is, the UE1 and the UE2 pass the eNB 1, the S-GW/MME, and the eNB2. Implement data and / or signaling interactions.

Continuous detection of UE1 and UE2, assuming that the distance between two UEs is detected to be less than the threshold A, and/or the reception strength or signal quality of the measurement pilot/search pilot received by UE1 from UE2 is greater than the threshold B (UE2 or UE1 receives pilots from the pilot signal), and a radio resource load or resource utilization / or detecting the eNB2 eNBl or greater than a threshold _{L l} UE1 and UE2 can be switched to the direct communication mode D2D communication mode.

As shown in FIG. 7B, it is assumed that UE1 and UE2 are within the coverage of base stations eNB1 and eNB2, respectively, and a communication relationship is established between UE1 and UE2 through the legacy mode.

Continuous detection is performed on UE1 and UE2, and 4 determines that the two UEs are in different cells, but the distance between the two is greater than the threshold C (C > A) and less than the threshold D (D > C). and / or detecting radio resources eNB2 eNBl or load or resource utilization less than a threshold value L _2, the UE1 and UE2 may be the D2D communication mode to the communication mode of the relay, i.e. a relay eNBl and eNB2 The transmission of data and/or signaling by the eNB1 and the eNB2 through, for example, the X2 interface.

Figure 8 shows a schematic block diagram of a selection device for a communication mode in accordance with one embodiment of the present invention. As shown in FIG. 8, the communication mode selection apparatus 800 according to an embodiment of the present invention includes: a location determination unit 802 and/or a condition determination unit 804, where the location determination unit 802 is configured to determine whether the target terminal is located at the current terminal. In the corresponding D2D communication range, the condition determining unit 804 is configured to determine whether the communication state of the current terminal meets a preset condition for establishing D2D communication; and the selecting unit 806 is configured to: when the target terminal is located in the current terminal, In the D2D communication range, and/or the communication state of the current terminal satisfies the preset condition, the current terminal is controlled to use the D2D mode for communication, and otherwise the non-D2D mode is used for communication.

In the foregoing technical solution, the location determining unit 802 includes: a precise positioning subunit 8022, configured to acquire accurate location information of the current terminal and the target terminal, and calculate the current terminal and the target An actual distance between the terminals and/or a path fading value; wherein, when the actual distance is less than or equal to a preset distance threshold, and/or the path fading value is less than or equal to a preset fading threshold, determining The target terminal is located in a D2D communication range corresponding to the current terminal. In the technical solution, by obtaining the accurate location information of the current terminal and the target terminal, the positional relationship between the two can be accurately determined, thereby determining the possibility that the current terminal communicates using the D2D mode. Specifically, the D2D communication range corresponding to the current terminal may be directly represented by a distance. For example, when the target terminal is located within a certain distance of the current terminal, it is determined to be in the D2D communication range; and the current terminal may be indirectly represented by other parameter values. The distance from the target terminal, for example, more specifically, can be represented by the path fading value, so that when the path fading value is small, it indicates that the distance between the two is relatively close, otherwise the distance is far.

In the above technical solution, the location determining unit 802 further includes: a pre-location sub-unit 8024, configured to acquire a neighboring terminal database that is maintained by the current terminal or maintained by the network side and corresponds to the current terminal, and And acquiring the area information in which the current terminal and the target terminal are respectively located; wherein, when the target terminal is found in the neighboring terminal database, and/or the current terminal is in the target terminal When the same area is within, the precise positioning sub-unit 8022 is activated, otherwise it is determined that the target terminal is not within the D2D communication range corresponding to the current terminal.

The current terminal and/or the network side can maintain the neighboring terminal database, that is, the terminal existing around the current terminal, which may be obtained by the current terminal itself and/or the network side (the current terminal and/or the network side may periodically Or the event triggering method, measuring the terminal existing around the current terminal, and updating to the neighboring terminal database maintained by the terminal, so that the real-time measurement is not required, so that the target terminal can be determined to be in the current terminal in a short time. Within the scope of D2D communication. Alternatively, after the current terminal and the target terminal are measured, or the network side performs measurement, the rough location information of the current terminal and the target terminal is determined, for example, whether the two are in the same area, to determine whether the target terminal is in the current terminal. Within the D2D communication range. The coarse location information may be a connected base station ID, a cell ID, and/or a tracking area ID, etc., to determine whether the two are in the same cell, sector, tracking area, and the like.

In the foregoing technical solution, the selecting unit 806 is further configured to: when the actual distance is less than or equal to a preset first distance threshold, and/or the path fading value is less than or equal to a preset number Determining a communication between the current terminal and the target terminal by using a direct D2D mode; when the actual distance is greater than a preset first distance threshold and less than or equal to a preset second Determining between the current terminal and the target terminal based on the threshold value, and/or the path fading value is greater than a preset first fading threshold and less than or equal to a preset second fading threshold The D2D mode of the relay communicates.

In any one of the foregoing technical solutions, the condition determining unit 804 includes: a precision determining subunit 8042, configured to measure a channel condition between the current terminal and the target terminal, when the channel condition meets a pre- When the channel condition is set, it is determined that the communication state of the current terminal satisfies the preset condition.

In the foregoing technical solution, the precision determining subunit 8042 is configured to: control the current terminal to send a specific pilot signal or a training sequence to the target terminal, and/or control the current terminal to receive the source The specific pilot signal or training sequence of the target terminal; wherein, when the signal receiving quality of the specific pilot signal or the training sequence is greater than or equal to a preset receiving quality threshold, and/or the specific When the signal receiving strength of the pilot signal or the training sequence is greater than or equal to the preset receiving strength threshold, it is determined that the communication state of the current terminal satisfies the preset condition.

In the above technical solution, the condition determining unit 804 further includes: a pre-decision sub-unit 8044, configured to acquire first state information of the current terminal and/or a second network side corresponding to the current terminal. State information; wherein, when the first state information and/or the second state information meets a corresponding state condition, the precision decision subunit 8042 is activated, otherwise determining that the communication state of the current terminal does not satisfy the Preset conditions.

In the foregoing technical solution, the first state information includes at least one of the following or a combination thereof: the real-time power of the current terminal; the real-time power consumption of the current terminal; and the current terminal-to-D2D communication function. a support status of the D2D communication function of the current terminal in the case of supporting the D2D communication function; and/or the second status information includes at least one of the following or a combination thereof: resources of the wireless link Utilization; resource load status of the wireless link; resource utilization of the backhaul link; resource load status of the backhaul link; core network data The load condition of a polygon node (such as SGW) and/or a signaling plane node (such as MME).

In the foregoing technical solution, the selecting unit 806 is further configured to: when the channel condition is better than a preset first channel condition, determine that the current terminal and the target terminal are directly used The D2D mode performs communication; when the channel condition is better than the preset second channel condition and is inferior to the preset first channel condition, determining that the relay-based D2D is used between the current terminal and the target terminal Way to communicate.

Figure 9 shows a schematic block diagram of a terminal in accordance with one embodiment of the present invention.

As shown in FIG. 9, a terminal 900 according to an embodiment of the present invention includes: a selection mode 800 of a communication mode as shown in FIG. Specifically, when the terminal 900 needs to determine the communication mode to be used (for example, for the D2D mode or the non-D2D mode, and the direct D2D mode or the relay-based D2D mode, etc.), it can be implemented by the terminal 900 itself. That is, through the selection mode device 800 of the communication mode and its specific function module as shown in FIG. 8, the communication mode in which the terminal 900 is most suitable for application is accurately determined.

Figure 10 shows a schematic block diagram of a base station in accordance with one embodiment of the present invention.

As shown in FIG. 10, a base station 1000 according to an embodiment of the present invention includes: a selection mode 800 of a communication mode as shown in FIG. Specifically, when a terminal connected to the base station 1000 needs to determine a communication mode to be used (for example, for a D2D mode or a non-D2D mode, and a direct D2D mode or a relay-based D2D mode), The base station 1000 passes the selection mode 800 of the communication mode as shown in FIG. 8 and its specific function module, thereby accurately determining the communication mode in which the terminal is most suitable for application.

The technical solution of the present invention is described in detail above with reference to the accompanying drawings. The present invention provides a method for selecting a communication mode, a device for selecting a communication mode, a terminal, and a base station. Accurately select the optimal communication mode, which helps to save terminal energy consumption and improve frequency utilization.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A method for selecting a communication mode, comprising:

Determining whether the target terminal is located in a D2D communication range corresponding to the current terminal, and/or determining whether the communication status of the current terminal satisfies a preset condition for establishing D2D communication;

When the target terminal is located in the D2D communication range corresponding to the current terminal, and/or the communication state of the current terminal satisfies the preset condition, the current terminal uses D2D mode to communicate, otherwise D2D mode for communication.

The method for selecting a communication mode according to claim 1, wherein the determining whether the target terminal is located in the D2D communication range corresponding to the current terminal specifically includes:

a precise positioning step, configured to acquire precise location information of the current terminal and the target terminal, and calculate an actual distance and/or a path fading value between the current terminal and the target terminal;

Determining that the target terminal is located in the D2D communication corresponding to the current terminal, when the actual distance is less than or equal to a preset distance threshold, and/or the path fading value is less than or equal to a preset fading threshold Within the scope.

The method for selecting a communication mode according to claim 2, further comprising: before the step of accurately positioning, further comprising:

a pre-positioning step, configured to acquire a neighboring terminal database that is maintained by the current terminal or that is maintained by the network side, and that obtains the area information of the current terminal and the target terminal respectively;

Wherein the precise positioning step is performed when the target terminal is found in the neighbor terminal database, and/or the current terminal is in the same area as the target terminal, otherwise the target terminal is determined not to be It is within the D2D communication range corresponding to the current terminal.

4. The method for selecting a communication mode according to claim 2, further comprising:

Determining between the current terminal and the target terminal when the actual distance is less than or equal to a preset first distance threshold, and/or the path fading value is less than or equal to a preset first fading threshold通信 Communicate in direct D2D mode; When the actual distance is greater than a preset first distance threshold and less than or equal to a preset second distance threshold, and/or the path fading value is greater than a preset first fading threshold and less than or equal to a preset When the second fading threshold is determined, it is determined that the current terminal and the target terminal communicate by using a relay-based D2D mode.

The method of selecting a communication mode according to any one of claims 1 to 4, wherein the determining whether the communication state of the current terminal satisfies a preset condition for establishing D2D communication specifically includes:

And an accurate decision step, configured to measure a channel condition between the current terminal and the target terminal, and when the channel condition meets a preset channel condition, determine that the communication state of the current terminal satisfies the preset condition.

The method for selecting a communication mode according to claim 5, wherein the measuring the channel quality specifically includes:

Transmitting, by the current terminal, a specific pilot signal or training sequence to the target terminal, and/or the current terminal receiving the specific pilot signal or training sequence from the target terminal;

The signal receiving quality of the specific pilot signal or training sequence is greater than or equal to a preset receiving quality threshold, and/or the signal receiving strength of the specific pilot signal or training sequence is greater than or equal to a preset. When the receiving strength is wide, it is determined that the communication state of the current terminal satisfies the preset condition.

The method for selecting a communication mode according to claim 5, further comprising: before the step of accurately determining, further comprising:

a pre-decision step, configured to acquire first state information of the current terminal and/or second state information of the network side corresponding to the current terminal;

The precise decision step is performed when the first state information and/or the second state information meets a corresponding state condition, otherwise it is determined that the communication state of the current terminal does not satisfy the preset condition.

The method for selecting a communication mode according to claim 7, wherein the first state information comprises at least one of the following or a combination thereof:

The real-time power of the current terminal; Real-time power consumption of the current terminal;

The current terminal support status of the D2D communication function;

Resource utilization of the wireless link;

The resource load status of the wireless link;

Resource utilization of the backhaul link;

Return the resource load status of the link;

The load of the core network data plane nodes (such as SGW) and / or signaling plane nodes (such as MME).

9. The method of selecting a communication mode according to claim 5, further comprising:

When the channel condition is better than the preset first channel condition, determining that the current terminal and the target terminal use a direct D2D mode for communication;

When the channel condition is better than the preset second channel condition and is inferior to the preset first channel condition, determining that the current terminal and the target terminal use the relay-based D2D mode to communicate.

10. A device for selecting a communication mode, comprising:

a position determining unit and/or a condition determining unit, wherein the position determining unit is configured to determine whether the target terminal is located in a D2D communication range corresponding to the current terminal, and the condition determining unit is configured to determine whether the communication state of the current terminal satisfies the establishment of the D2D Pre-set conditions for communication;

a selecting unit, configured to: when the target terminal is located in a D2D communication range corresponding to the current terminal, and/or the communication state of the current terminal meets the preset condition, control the current terminal to select a D2D mode for communication Otherwise, use non-D2D mode for communication.

The device for selecting a communication mode according to claim 10, wherein the location determining unit comprises:

a precise positioning subunit, configured to acquire accurate location information of the current terminal and the target terminal, and calculate an actual distance and/or path failure between the current terminal and the target terminal Fall value

The device for selecting a communication mode according to claim 11, wherein the location determining unit further comprises:

a pre-location sub-unit, configured to acquire a neighboring terminal database corresponding to the current terminal maintained by the current terminal or maintained by the network side, and/or obtain area information of the current terminal and the target terminal respectively;

Wherein, when the target terminal is found in the neighboring terminal database, and/or the current terminal is in the same area as the target terminal, the precise positioning subunit is activated, otherwise the target terminal is determined. It is not in the D2D communication range corresponding to the current terminal.

The device for selecting a communication mode according to claim 11, wherein the selection unit is further configured to:

Determining between the current terminal and the target terminal when the actual distance is less than or equal to a preset first distance threshold, and/or the path fading value is less than or equal to a preset first fading threshold通信 Communicate in direct D2D mode;

When the actual distance is greater than a preset first distance threshold and less than or equal to a preset second distance threshold, and/or the path fading value is greater than a preset first fading threshold and less than or equal to a preset When the second fading threshold is determined, it is determined that the current terminal and the target terminal communicate by using a relay-based D2D mode.

The communication mode selection device according to any one of claims 10 to 13, wherein the condition determination unit comprises:

And a precision decision subunit, configured to measure a channel condition between the current terminal and the target terminal, and when the channel condition meets a preset channel condition, determine that the communication state of the current terminal satisfies the preset condition.

15. The communication mode selection device according to claim 14, wherein the precise decision subunit is used to:

Controlling, by the current terminal, a specific pilot signal or a training sequence to be sent to the target terminal, And/or controlling the current terminal to receive the particular pilot signal or training sequence from the target terminal;

The device for selecting a communication mode according to claim 14, wherein the condition determining unit further comprises:

a pre-judgment sub-unit, configured to acquire first state information of the current terminal and/or second state information of a network side corresponding to the current terminal;

The fine decision subunit is activated when the first state information and/or the second state information meets a corresponding state condition, otherwise it is determined that the communication state of the current terminal does not satisfy the preset condition.

17. The communication mode selection device according to claim 16, wherein the first state information comprises at least one of the following or a combination thereof:

The real-time power of the current terminal;

Real-time power consumption of the current terminal;

The current terminal support status of the D2D communication function;

Resource utilization of the wireless link;

The resource load status of the wireless link;

Resource utilization of the backhaul link;

Return the resource load status of the link;

The device for selecting a communication mode according to claim 14, wherein the selecting unit is further configured to: When the channel condition is better than the preset first channel condition, determining that the current terminal and the target terminal use a direct D2D mode for communication;

A terminal, comprising: the selection means of the communication mode according to any one of claims 10 to 18.

A base station, comprising: the selection means of the communication mode according to any one of claims 10 to 18.