TW201521370A - Method and device for mitigating interference - Google Patents

Abstract

Embodiments of the present invention provide a method of mitigating interference in user equipment at a transmitting end and corresponding user equipment. The method comprises: obtaining a maximum available transmit power; determining a first path loss power of at least one desired D2D link to user equipment at a receiving end, and determining a second path loss power of at least one interference link; determining an estimated transmit power according to the first path loss power and the second path loss power; and selecting a smaller power from the maximum available transmit power and the estimated transmit power, as a transmit power.; By employing the method according to embodiments of the present invention, the transmit power of the user equipment at the transmitting end is controlled, which not only ensures communication quality of the desired D2D link but also effectively mitigates the interference caused by the transmitting end of the desired D2D link to the receiving ends of other links multiplexing the same resource blocks as it since interference of an interference link is considered, thereby improving the capability of interference mitigation in D2D communication.

Description

Method and user equipment for suppressing interference

Embodiments of the present invention relate to the field of communications, and more particularly to a method and user equipment for suppressing interference in a D2D (Device-to-Device).

The introduction of D2D communication in cellular communication systems is a research hotspot in the field of communication. D2D communication refers to direct communication between two or more user devices. There are four usage examples for D2D communication. As shown in Figure 1, Example 1 is Unicast, where two user devices communicate with each other. Example 2 is Group-cast. A user device simultaneously sends information to the same device. Multiple user equipments in a member group; Example 3 is broadcast, a user equipment simultaneously broadcasts information to all user equipments in a certain geographical range; Example 4 is a relay, and a user equipment acts as a relay. Retransmit messages sent by the base station or other user equipment to one or more other user equipments.

The introduction of D2D communication has many advantages, such as efficient radio resource utilization, high spectral efficiency, low power consumption, and improved performance of cell edge users. However, if D2D communication multiplexes the cellular network Resource blocks, and depending on the resource allocation policy, the same resource blocks may be multiplexed between different D2D links, so between the D2D link and the cellular link of the cellular network and between different D2D links There is interference. In order to improve the overall communication quality of the system, it is necessary to suppress interference in D2D communication.

In the prior art solution, a method for suppressing interference in cellular network communication is used, and a method for performing interference suppression by controlling transmission power of a user equipment at a transmitting end in unicast D2D communication is given. Specifically, the method includes: obtaining a maximum available transmit power, determining a path loss power of a D2D desired link between user equipments at the receiving end, determining an estimated transmit power according to the determined path loss power, and determining a transmit power from the maximum available transmit power and the estimated transmit power. A smaller power is selected as the transmission power.

However, the existing technical solution has the following problem: since only the path loss power of a D2D desired link is determined, interference can only be suppressed in unicast D2D communication, and there are no multiple pieces of multicast, broadcast, and relay propagation. D2D expects the D2D communication of the link to perform interference suppression, which makes the existing technical solutions have certain use limitations. In addition, the existing technical solution only considers the path loss power of the D2D desired link to control the transmission power of the user equipment at the transmitting end, and ensures the communication quality of the D2D desired link, but when the user equipment at the transmitting end transmits the information by using the finally selected transmission power. There is still a large interference to other D2D links and cellular links that multiplex the same resource blocks, and the interference suppression capability is poor.

In view of the technical problems existing in the prior art, embodiments of the present invention provide a method and user equipment for suppressing interference.

According to an embodiment of the present invention, a method of suppressing interference in a user equipment at a transmitting end is provided. The method includes: obtaining a maximum available transmit power; determining a first path loss power of the at least one device of the user equipment at the receiving end to the desired link of the device D2D, and determining a second path loss power of the at least one interfering link; A path loss power and the second path loss power are used to determine an estimated transmission power; and a smaller power is selected as the transmission power from the maximum available transmission power and the estimated transmission power.

According to another embodiment of the invention, an apparatus is provided. The device includes: acquiring means, configured to obtain a maximum available transmit power; and first determining means, configured to determine a first path loss power of the at least one device of the user equipment to the receiving end to the desired link of the device D2D, and determine at least one interference a second path loss power of the link; second determining means for determining an estimated transmit power based on the first path loss power and the second path loss power; and selecting means for using the maximum available transmit power and A smaller power is selected as the transmission power from the estimated transmission power.

The technical solution for suppressing interference provided by the embodiments of the present invention is suitable for performing interference suppression in various D2D communications such as unicast, multicast, broadcast, and relay transmission.

According to an embodiment of the present invention, the estimated transmit power is determined by the first path loss power of the D2D desired link and the second path loss power of the interference link, thereby being available from the maximum available transmit power and the estimated transmit power. Selecting a smaller power as the transmission power, so that the user equipment at the transmitting end transmits the information by using the selected transmission power, not only ensures the communication quality of the D2D desired link, but also effectively suppresses the D2D expectation by considering the interference of the interference link. The interference of the transmitting end of the link to the receiving end of other links with which the same resource block is multiplexed, and the ability to suppress interference in D2D communication is improved.

400‧‧‧User equipment

401‧‧‧Getting device

402‧‧‧First determining device

403‧‧‧Second determining device

404‧‧‧Selection device

Other features, objects, and advantages of the invention will be apparent from the description of the appended claims. In the drawings, the same or similar reference numerals represent the same or similar device or method steps, wherein: FIG. 1 schematically shows a user example in D2D communication; FIG. 2 schematically shows in D2D communication. Various links; FIG. 3 is a flow chart schematically showing a method of suppressing interference in a user equipment at a transmitting end according to an embodiment of the present invention; FIG. 4 is a schematic diagram showing A block diagram of a user equipment in which a method of suppressing interference is implemented.

Exemplary embodiments of the present invention provide methods and apparatus for suppressing interference. In some embodiments of the present invention, power control of a user equipment based on a transmitting end of a D2D desired link is provided to suppress interference. In some other embodiments of the present invention, a D2D-based desired link is provided. The communication mode selection of the user equipment of the transmitting end and the resource block configuration of the D2D desired link are used to suppress interference.

An application scenario of an exemplary embodiment of the present invention is: in D2D communication, when a D2D desired link uses the same resource block as a cellular link and other D2D links, the user equipment of the transmitting end of the D2D desired link is using the resource. When a block transmits information, it interferes with cellular links and other D2D links that also use the resource block to transmit information. In order to ensure the quality of the entire network communication, such interference suppression is required. Moreover, although D2D communication can multiplex the uplink resources and downlink resources of the cellular network, since multiplexing the uplink resources is more advantageous than multiplexing the downlink resources, for example, due to the downlink of the cellular network. The receiving end of the link is a user equipment whose position is constantly changing. It is difficult to estimate the interference caused by the user equipment at the transmitting end of the D2D desired link, thereby making it difficult to perform interference suppression; for example, the uplink transmission volume of the cellular network. Typically less than the amount of downlink traffic, the impact of D2D communication multiplexing uplink resources on cellular network communications is smaller than in the downlink. For various reasons, when establishing D2D communication, it is usually allocated uplink resources of the cellular network. Accordingly, the exemplary embodiments of the present invention consider the problem of suppressing interference when the D2D desired link multiplexes the uplink resources of the cellular network. As shown in Figure 2, a D2D desired link, an interfering link, and other D2D links and cellular links are shown.

Various embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 3 schematically illustrates a flow diagram of a method 300 of suppressing interference in a user equipment at a transmitting end, in accordance with an embodiment of the present invention. The method can To achieve interference in any user equipment that is a transmitting end of D2D communication.

The method 300 obtains the maximum available transmit power at step S301. The user equipment at the transmitting end is affected by the communication status of the user, and the maximum available transmit power changes. Therefore, the current maximum available transmit power needs to be obtained. The method 300 determines, at step S302, a first path loss power to at least one D2D desired link of the user equipment at the receiving end, and determines a second path loss power of the at least one interfering link. Next, the method 300 determines the estimated transmit power based on the first path loss power and the second path loss power at step S303, and selects a smaller one of the maximum available transmit power and the estimated transmit power at step S304. The power is taken as the transmission power. It can be understood that step S301 can be performed before step S302, or can be performed after step S302 or S303, and only needs to ensure that the method 300 obtains the maximum available transmit power and the estimated transmit power before step S304.

In accordance with an embodiment of the present invention, in method 300, the D2D desired link may be one or more, depending on the D2D communication usage paradigm employed by the user equipment at the transmitting end. For example, in FIG. 2, the user equipment at the transmitting end is A1, which uses the multicast D2D communication usage example to perform D2D communication with the user equipments A3, A2, and A4 at the receiving end. Therefore, there are three D2D desired links.

According to an embodiment of the present invention, determining, in the method 300, the first path loss power of the at least one D2D desired link to the user equipment of the receiving end comprises: determining each D2D expected chain of the user equipment to the receiving end The first estimated path loss power of the path; and the first path loss power is determined based on the determined first estimated path loss power.

When determining the first estimated path loss power of each D2D desired link of the user equipment at the receiving end, since the location of the user equipment of the receiving end of each D2D desired link and the user equipment of the transmitting end are constantly changing and the user equipment of the transmitting end The transmit power is also constantly changing, and the path loss power on each D2D desired link is also difficult to accurately determine.

According to an embodiment of the invention, determining the first estimated path loss power of each D2D desired link comprises a processing mode (a1): determining a first estimated path loss for each D2D desired link of the user equipment at the receiving end The power includes: obtaining a first RSRP (Reference Signal Receiving Power) of each D2D desired link of the user equipment at the receiving end, and determining a first estimate of each D2D desired link according to the first RSRP. Measure path loss power.

The first RSRP refers to the received power when the reference signal is received after each reference signal is transmitted on each D2D desired link. The user equipment at the receiving end of each D2D desired link may be transmitted with a predetermined transmission power (for example, the maximum available transmission power), and the reference signal may be received by the user equipment at the transmitting end; or the predetermined transmission power may be adopted by the user equipment at the transmitting end (for example) , the maximum available transmit power) is transmitted, and the reference signal is received by the user equipment at the receiving end of each D2D desired link. The user equipment of the receiving end of each D2D desired link may use the received power of the reference signal as the first RSRP, and send the first RSRP to the user equipment of the transmitting end, so that the user equipment of the transmitting end acquires the first RSRP. In a In one embodiment, the first RSRP can be directly used as the first estimated path loss power of each D2D desired link. In another embodiment, the functional relationship between the first RSRP and the first estimated path loss power can also be determined through modeling, so that the first estimated path loss power is obtained according to the first RSRP function operation.

According to another embodiment of the present invention, determining the first estimated path loss power of each D2D desired link includes a processing mode (a2): determining a first distance between user equipments at the receiving end of each D2D desired link And determining a first estimated path loss power of each D2D desired link based on the first distance.

The first distance between the user equipment at the transmitting end and the user equipment at the receiving end of each D2D desired link may be determined by using an existing positioning technology, such as a GPS (Global Positioning System) positioning technology, Bluetooth positioning. , Wi-Fi network positioning, and more. Since the path loss on the D2D desired link is related to the distance between the transmitting end and the receiving end of the D2D desired link, the first distance can reflect the path loss power of the D2D desired link. In one embodiment, the first estimated path loss power of each D2D desired link can be directly represented directly by the first distance. In another embodiment, the functional relationship between the distance and the path loss can also be determined through modeling, so that the first estimated path loss power is obtained by performing a function operation according to the first distance.

In order to more accurately determine the first estimated path loss power of each D2D desired link, according to an embodiment of the present invention, determining the first estimated path loss power of each D2D desired link includes a processing manner (a3): receiving a first reference signal sent by the user equipment in the first geographical range by using the first predetermined transmit power, and determining a received power of the first reference signal, wherein the user equipment of the transmitting end knows the first reservation in advance Transmitting power; determining, according to the first predetermined transmit power and the received power of each first reference signal, a D2D actual path loss power of a link between the user equipment in the first geographical range and the user equipment in the transmitting end; And the D2D actual path loss power of each user equipment included in the at least one D2D desired link and the user equipment of the transmitting end in the user equipment in the first geographical range as the first of each D2D desired link Estimate path loss power.

In order to enable the user equipment in the first geographical range to transmit the first reference signal by using the first predetermined transmit power, according to an embodiment of the present invention, the user equipment at the transmitting end uses a pre-configured transmit power broadcast measurement request, and the The user equipment of the measurement request is defined as a user equipment in the first geographical range; and the first reference signal sent by the user equipment in the first geographical range is received by using the first predetermined transmission power. The pre-configured transmit power may be the maximum available transmit power of the user equipment at the transmitting end, so as to be able to broadcast the measurement request to the user equipment of the receiving end of all D2D desired links.

Also, in order to enable the user equipment in the first geographical range to transmit the first reference signal by using the first predetermined transmit power, in another embodiment according to the present invention, the user equipment at the transmitting end receives the user equipment in the first geographical range and receives the The first reference sent by the first predetermined transmit power after the measurement request sent by the base station of the cell where the user equipment of the transmitting end is located a signal; wherein the base station of the cell where the user equipment of the transmitting end is located knows in advance the geographical location of the user equipment in the first geographical range. The base station of the cell where the user equipment of the transmitting end is located sends a measurement request, and can determine the sending power according to the size of the geographical range known in advance, so as to accurately transmit the measurement request to the user equipment in the preset geographical range. .

In such an embodiment, the manner in which the base station of the cell where the user equipment is located at the transmitting end sends a measurement request is different according to the location of the user equipment in the first geographical range. Therefore, according to an embodiment of the present invention, after receiving the measurement request sent by the base station of the cell where the user equipment of the transmitting end is located, the first device that is sent by using the first predetermined transmit power is received by the user equipment in the first geographical range. The reference signal includes: when the user equipment in the first geographical range is located in the cell where the user equipment of the sending end is located, receiving, by the user equipment in the first geographical range, the cell where the user equipment of the sending end is located Receiving the first reference signal sent by the first predetermined transmission power after the measurement request sent by the base station directly; when the user equipment in the first geographical range is not located in the cell where the user equipment of the transmitting end is located, receiving the first reference signal The user equipment in the cell in the first geographical range that is located in the cell where the transmitting end is located is sent by using the first predetermined sending power after receiving the measurement request directly sent by the base station of the cell where the user equipment of the transmitting end is located. The first reference signal, and receiving the user equipment in the first geographical range, except at the transmitting end Other user devices other than the first cell receiving from a base station to a user equipment located in a cell of the sending end of the predetermined cells neighboring base stations, The first reference signal transmitted by the first predetermined transmission power after the measurement request forwarded by the base station of the predetermined neighboring cell. The predetermined neighboring cell refers to a cell of the user equipment in the first geographical range except for other user equipments located in the cell where the transmitting end is located.

According to an embodiment of the present invention, in the foregoing processing mode (a3), the user equipment in the first geographical range and the user equipment in the transmitting end are determined according to the first predetermined transmit power and the received power of each first reference signal. The actual path loss power of the D2D between the links. In an embodiment, the difference between the first predetermined transmit power and the received power of each first reference signal may be used as the D2D actual link between the user equipment in the first geographical range and the user equipment on the transmitting end. Path loss power. The first predetermined transmit power used by the user equipment in each of the first geographical ranges may be different. The user equipment at the transmitting end may distinguish the first predetermined transmit power used by the user equipment in each first geographical range.

In the foregoing processing mode (a3), it can be known that the user equipment in the first geographical range includes the user equipment of the receiving end of the D2D desired link, and the user equipment of the transmitting end also knows the user equipment of the receiving end of the D2D desired link in advance. Therefore, the D2D actual path loss power of each user equipment and the user equipment of the transmitting end included in the at least one D2D desired link in the user equipment in the first geographical range may be used as the first estimation of each D2D expected link. Measure path loss power. Here, since the D2D actual path loss power is determined according to the transmission power and the received power of the reference signal on the D2D desired link, the D2D expectation is more accurately expressed. Path loss on the link. Therefore, after the D2D actual path loss power is taken as the first estimated path loss power of each D2D desired link, the first estimated path loss power will be more accurate.

According to an embodiment of the present invention, determining the first estimated path loss power of each D2D desired link comprises a processing mode (a4): transmitting a second reference signal with a second predetermined transmit power, and determining to receive the second reference Receiving power of the user equipment of the signal; determining, according to the second predetermined transmission power and the received power of the user equipment that receives the second reference signal, each user equipment that receives the second reference signal and the transmitting The D2D actual path loss power of the link between the end user equipments; and each user equipment included in the at least one D2D desired link and the user equipment of the transmitting end among the user equipments that will receive the second reference signal The D2D actual path loss power of the link between is the first estimated path loss power of each D2D desired link.

In the processing mode (a4), the user equipment of the transmitting end sends the reference signal, and the user equipment at the transmitting end can control the size of the second predetermined sending power to control the user equipment in which the user equipment in a certain geographical range can receive the second reference signal. In an optional implementation manner, the user equipment at the transmitting end may send the second reference signal with maximum power.

After the user equipment at the transmitting end sends the second reference signal, the user equipment receiving the second reference signal may determine the received power of the second reference signal. According to an embodiment of the present invention, the user equipment receiving the second reference signal directly transmits the received power of the second reference signal to the user equipment of the transmitting end, or to the base station of the cell in which it is located, by which The base station of the cell is sent to the user equipment of the sender. After receiving the received power of the second reference signal, the user equipment at the transmitting end calculates the D2D actual path loss power accordingly. According to another embodiment of the present invention, the user equipment receiving the second reference signal knows the second predetermined transmission power in advance, so that the D2D actual path loss power can be determined according to the second predetermined transmission power and the received power of the second reference signal. The determined D2D actual path loss is directly sent to the user equipment of the transmitting end, or sent to the base station of the cell in which it is located, and the actual path loss of the D2D determined by the base station of the cell is sent to the user equipment of the transmitting end. If the base station of the cell in which the user equipment that receives the second reference signal is located is different from the base station of the cell in which the user equipment of the transmitting end is located, the base station of the cell in which the user equipment that receives the second reference signal is located needs to be sent to The information of the user equipment at the transmitting end is sent to the base station of the cell where the user equipment at the transmitting end is located, and is forwarded to the user equipment of the transmitting end by the base station of the cell where the user equipment of the transmitting end is located.

In the above processing manner (a4), it can be known that the user equipment that receives the second reference signal includes the user equipment of the receiving end of the D2D desired link, and the user equipment of the transmitting end also knows the user equipment of the receiving end of the D2D desired link in advance. Therefore, the D2D actual path loss power of each user equipment and the user equipment of the transmitting end included in the at least one D2D desired link in the user equipment that receives the second reference signal may be the first of each D2D desired link. Estimate path loss power. In the above processing mode (4), since the D2D actual path loss power is determined according to the transmission power and the received power of the reference signal on the D2D desired link, More accurately represents the path loss on the D2D desired link. Therefore, after the D2D actual path loss power is taken as the first estimated path loss power of each D2D desired link, the first estimated path loss power will be more accurate.

According to the above embodiment, the first estimated path loss power of each D2D desired link can be determined, and the first estimated path loss power reflects the communication status of each D2D desired link. When determining the transmit power of the user equipment at the transmitting end in the method 300, it is necessary to weigh the communication quality of the D2D desired link and the interference suppression of the interfering link. Thus, the first path loss power can be determined based on the determined first estimated path loss power, and the first path loss power is used to reflect the communication status of all D2D desired links.

According to an embodiment of the present invention, determining the first path loss power according to the determined first estimated path loss power comprises a processing mode (b1): determining a first estimate of the first estimated path loss power The path loss power is determined as the first path loss power.

For example, the maximum value of the first estimated path loss power can be determined using the following formula:

among them a linear value representing the first path loss power; K represents the number of D2D desired links; A linear value representing the first estimated path loss power of the 1st to Kth D2D desired links.

According to another embodiment of the present invention, determining the first path loss power according to the determined first estimated path loss power includes a processing manner (b2): calculating a determined harmonic average of the first estimated path loss power, and using the calculated harmonic average as the first path loss power.

For example, you can calculate a harmonic mean using the following formula:

among them a linear value representing the first path loss power; K represents the number of D2D desired links; A linear value representing the first estimated path loss power of the 1st to Kth D2D desired links.

According to still another embodiment of the present invention, determining the first path loss power according to the determined first estimated path loss power includes a processing mode (b3): calculating a determined linear combined average value of the first estimated path loss power, And the calculated average value of the linear combination is taken as the first path loss power.

For example, you can use the following formula to calculate a linear combination average:

among them a linear value representing the first path loss power; K represents the number of D2D desired links; A linear value representing the first estimated path loss power of the 1st to Kth D2D desired links; ω ₁ , . . . , ω _K is the weight of the corresponding D2D desired link, and ω ₁ +... + ω _K =1.

The first path loss power determined by (b1) ensures D2D (b2) determining the first path loss power to coordinate the communication quality of all D2D desired links; (b3) ensuring different based on the weights of different D2D desired links D2D expects the communication quality of the link. For example, a higher priority D2D desired link can be assigned a higher weight, and so on.

It will be appreciated by those skilled in the art that in calculating the harmonic mean and the linear mean, for calculation accuracy, in one embodiment, it is desirable to utilize the first estimated path loss power of each D2D desired link. The linear value is calculated and the resulting first interference path loss power is also a linear value. When determining the estimated transmit power at the subsequent step S303, the linear value of the first interference path loss power may be taken as a logarithmic value to obtain a logarithmic expression of the commonly used power (for example, in dB). However, in some embodiments, the processing mode (b1) is not limited to selecting a linear value or a logarithmic value of the first estimated path loss power when selecting the maximum first estimated path loss power.

It can be understood that the above-described process of determining the first path loss power according to the determined first estimated path loss power is merely exemplary and illustrative. Embodiments of the invention are not limited to the specific treatments disclosed herein. Those skilled in the art can determine other first path loss powers in accordance with the teachings of the present specification by other suitable (existing or future developed) methods.

The method 300 further determines, in addition to the first path loss power of the at least one D2D desired link of the user equipment at the receiving end, at step S302, the second path loss power of the at least one interfering link. can It is understood that, at step S302, determining that the first path loss power of the at least one D2D desired link of the user equipment at the receiving end and the determining the second path loss power of the at least one interference link are in no particular order, may be performed simultaneously or according to Any one of them is executed sequentially.

When determining the second path loss power of the at least one interfering link, where the interfering link refers to the user equipment of the transmitting end of the D2D desired link, when transmitting the information to the receiving end of the D2D desired link, to other user equipment or the base station The link that caused the interference. The interfering link includes a D2D interfering link consisting of a receiving end of another D2D link using the same resource block as the D2D desired link and a user equipment of the transmitting end, and/or using the same resource as the D2D desired link A cellular interference link formed by the receiving end of the block's cellular link and the user equipment of the transmitting end. In an exemplary embodiment of the present invention, consider the case where the D2D interference link multiplexes the uplink resources of the cellular network, and therefore, for the D2D interference link, the interfered object is the information received in the D2D interference link. The user equipment at the receiving end; for the cellular interference link, the interfered object is a base station that receives uplink information in the cellular link. The number of D2D interference links and cellular interference links included in the interference link is determined by the actual allocation of uplink resources. For example, in FIG. 2, the interference link formed by the user equipment A1 at the transmitting end transmitting information using the same resource block as the other D2D links and the cellular link. There are two D2D interference links: A1 to B1, A1 to C1; and three cellular interference links: A1 to S1, A1 to S3, and A1 to S5.

Since the path loss of the D2D interference link and the cellular interference link are different due to interference, the paths on different types of interference links can be determined separately. Diameter loss power. According to an embodiment of the invention, determining the second path loss power of the at least one interference link comprises: determining a first interference path loss power of the D2D interference link, and/or determining a second interference path of the cellular interference link Loss power; determining the second path loss power according to the first interference path loss power and/or the second interference path loss power.

The process of determining the first interference path loss power of the D2D interference link and determining the second interference path loss power of the cellular interference link is also not sequential, and may be performed simultaneously or in any order.

According to an embodiment of the present invention, determining the first interference path loss power of the D2D interference link comprises: determining a second estimated path loss power of each D2D interference link; and determining the second estimated path loss according to the determined The power is used to determine the first interference path loss power.

Since the D2D interference link is similar to the D2D expected link, it is a link between two user equipments, so the second estimated path loss power of each D2D interference link is determined and each D2D desired link is determined. The first estimated path loss power is similar.

According to an embodiment of the present invention, determining a second estimated path loss power of each D2D interference link includes a processing mode (c1): acquiring a second RSRP on each D2D interference link, and according to the second RSRP A second estimated path loss power for each D2D interference link is determined.

According to another embodiment of the present invention, each D2D interference is determined The second estimated path loss power of the link includes a processing mode (c2): determining a second distance between the user equipments at the receiving end of each D2D interference link, and determining each D2D interference according to the second distance The second estimated path loss power of the link.

It can be seen that the above processing modes (c1) and (c2) are similar to the processing modes (a1) and (a2) for determining the first estimated path loss power of each D2D desired link, and are not described herein again. Moreover, in order to more accurately determine the second estimated path loss power of each D2D desired link, similar to the manner of determining the first estimated path loss power of each D2D desired link, the present invention also provides the following Some embodiments.

According to another embodiment of the present invention, the method for determining the second estimated path loss power of each D2D interference link includes a processing mode (c3): receiving a first user equipment in the first geographical range to transmit by using the first predetermined transmission power a reference signal, and determining a received power of the first reference signal, wherein the user equipment of the transmitting end knows the first predetermined transmit power in advance; according to the first predetermined transmit power and the received power of each first reference signal, Determining a D2D actual path loss power of a link between the user equipment in the first geographical area and the user equipment in the transmitting end; wherein the user equipment in the first geographical range is included in the at least one D2D desired link The other user equipments other than the user equipment and the user equipment of the transmitting end constitute a D2D interference link; and determine the D2D actual path loss power of each D2D interference link as the second estimated path loss power of each D2D interference link. .

Wherein the above processing method (c3) and determining each D2D desired link The processing method (a3) of the first estimated path loss is similar, and the specific implementation manner can be referred to the above processing method (a3). However, in the foregoing processing mode (c3), the user equipment in the first geographical range except the user equipment included in the D2D desired link is a user that is interfered by the user equipment of the transmitting end of the D2D desired link. The devices, therefore, the user equipment and the user equipment at the transmitting end form a D2D interference link, and the previously determined D2D actual path loss power is used as the second estimated path loss of the D2D interference link.

According to still another embodiment of the present invention, determining a second estimated path loss power of each D2D interference link includes a processing mode (c4): transmitting a second reference signal by using a second predetermined transmit power, and determining to receive the first Receiving power of the user equipment of the second reference signal; determining, according to the second predetermined transmission power and the received power of each user equipment that receives the second reference signal, to each user equipment that receives the second reference signal and The D2D actual path loss power of the link between the user equipments at the transmitting end; wherein the user equipment receiving the second reference signal includes other user equipments other than the user equipment included in the at least one D2D desired link and the user equipment a D2D interference link composed of user equipments at the transmitting end; and determining a D2D actual path loss power of each D2D interference link as a second estimated path loss power of each D2D interference link.

The processing mode (c4) is similar to the processing mode (a4) for determining the first estimated path loss of each D2D desired link. For the specific implementation, refer to the foregoing processing mode (a4). However, in the above processing mode (c4), the user equipment that receives the second reference signal includes The other user equipments other than the user equipment of the D2D desired link are user equipments that are interfered by the user equipment of the transmitting end of the D2D desired link. Therefore, the user equipments and the user equipments of the transmitting end form a D2D interference link, which will be determined before. The D2D actual path loss power is the second estimated path loss of the D2D interference link.

Because in the above processing modes (c3) and (c4), the second estimated path loss power obtained according to the difference between the transmission power and the received power when the reference signal is transmitted on the D2D interference link, according to the above processing method (c3) And the second estimated path loss power determined by (c4) is more accurate than the second estimated path loss power obtained according to the above processing modes (c1) and (c2).

According to the above embodiment, the second estimated path loss power of each D2D interference link can be determined, and the second estimated path loss power reflects the interference condition of each D2D interference link. When determining the transmit power of the user equipment at the transmitting end in the method 300, it is necessary to weigh the communication quality of the D2D desired link and the interference suppression of the interfering link. Thus, the first interference path loss power can be determined according to the determined second estimated path loss power, and the first interference path loss power is used to reflect the interference status of all D2D interference links.

According to an embodiment of the present invention, determining the first interference path loss power according to the determined second estimated path loss power includes a processing mode (d1): determining a second estimate of the second estimated path loss power The measured path loss power is determined as the first interference path loss power.

For example, the minimum of the first interference path loss power can be determined by the following formula:

among them a linear value representing the first interference path loss power; M represents the number of D2D interference links; A linear value representing the second estimated path loss power of the first to the Mth D2D interference links.

According to an embodiment of the present invention, determining the first interference path loss power according to the determined second estimated path loss power includes a processing mode (d2): calculating a determined harmonic mean value of the second estimated path loss power, and The calculated average of the harmonics is taken as the first interference path loss power.

For example, you can calculate a harmonic mean using the following formula:

among them a linear value representing the first interference path loss power; M represents the number of D2D interference links; A linear value representing the second estimated path loss power of the first to the Mth D2D interference links.

According to another embodiment of the present invention, determining the first interference path loss power according to the determined second estimated path loss power includes a processing mode (d3): calculating a linear combination average value of the determined second estimated path loss power And calculating the calculated average value of the linear combination as the first interference path loss power.

For example, you can use the following formula to calculate a linear combination average:

among them a linear value representing the first interference path loss power; M represents the number of D2D interference links; A linear value representing the second estimated path loss power of the D2D interference link of the first to the Mth; ω ₁ , . . . , ω _M is the weight of the corresponding D2D interference link, and ω ₁ +... + ω _M =1.

The first interference path loss power determined by (d1) is for suppressing interference on the most interfered link in the D2D interference link; (d2) the determined first interference path loss power is for coordinating suppression of all D2D interference chains. Interference on the road; (d3) suppress interference on all D2D interference links based on the weight of different D2D interference links. For example, an interference link with lower interference tolerance can be assigned a higher weight, and so on.

It will be appreciated by those skilled in the art that in calculating the harmonic mean and the linear mean, for calculation accuracy, in one embodiment, a second estimated path loss power of each D2D interference link is required. The linear value is calculated and the resulting first interference path loss power is also a linear value. When the second path loss power is subsequently determined, the linear value of the first interference path loss power may be taken as a logarithmic value to obtain a logarithmic expression of the commonly used power (for example, in dB). However, in some embodiments, the processing mode (d1) is not limited to the linear value or pair of power loss by the second estimated path when selecting the maximum second estimated path loss power. The value is selected.

It can be understood that the above-described process of determining the first interference path loss power according to the determined second estimated path loss power is merely exemplary and illustrative. Embodiments of the invention are not limited to the specific treatments disclosed herein. One skilled in the art can employ other suitable (existing or future developed) methods to determine the first interference path loss power in accordance with the teachings of the present specification.

The above describes the processing method for determining the first interference path loss of the D2D interference link. Next, the processing method for determining the second interference path loss of the cellular interference link will be described. According to an embodiment of the present invention, determining the second interference path loss power of the cellular interference link comprises: determining a cellular actual path loss power of each of the cellular interference links; and determining the first according to the determined actual path loss power of the cellular Two interference path loss power.

It is mentioned that when the user equipment considering the transmitting end of the D2D desired link interferes with the cellular link, the interfered object is a base station in the cellular link, and the base station can be a macro base station or a micro base station, and the cellular network The actual configuration of the road is determined. Since the location of the base station is usually fixed and the transmission power is also generally fixed, the actual path loss power of each cellular interference link composed of the base station and the user equipment of the transmitting end can be relatively accurately determined.

According to an embodiment of the present invention, determining a cellular actual path loss power of each cellular interference link includes a processing mode (e): receiving a third reference signal transmitted by a receiving end of each cellular interference link by using a third predetermined transmission power Where the user equipment at the transmitting end knows the third reservation in advance Transmitting power; determining received power of the received third reference signal; and determining a cellular actual path loss power of each cellular interference link according to the received received power of the third reference signal and the third predetermined transmit power .

Since the user equipment at the transmitting end can obtain the transmission power and the reception power of the third reference signal, the actual path loss power of the cell can be determined according to the difference between the third predetermined transmission power and the received power of the third reference signal. The third predetermined transmit power used by the receiving end of each of the cellular interference links may be different, and the user equipment of the transmitting end of the D2D desired link may distinguish the third predetermined transmit power of different cellular interference links in advance, thereby determining The actual path loss power of the cell out of each cellular interference link.

According to the above embodiment, the actual path loss power of each cellular interference path can be determined, and the actual path loss power of the cell reflects the interference condition of each cellular interference link. When determining the transmit power of the user equipment at the transmitting end in the method 300, it is necessary to weigh the communication quality of the D2D desired link and the interference suppression of the interfering link. Thus, the second interference path loss power can be determined according to the determined cellular actual path loss power, and the second interference path loss power is used to reflect the interference status of all the cellular interference links. It can be known that the second interference path loss power reflects the interference condition of the cellular interference link.

Since the cellular interference link and the D2D interference link are both interference links, the basis of the second interference path loss power is determined according to the determined actual path loss power of the cell and the second estimated path loss power according to the determined D2D interference link. The basis for determining the first interference path is similar.

According to an embodiment of the present invention, determining the second interference path loss power according to the determined cellular actual path loss power includes a processing mode (f1): determining the determined minimum cellular actual path loss power of the determined cellular actual path loss power as The second interference path loses power.

For example, the minimum of the second interference path loss power can be determined by the following formula:

among them a linear value representing the first interference path loss power; N represents the number of D2D interference links; A linear value representing the actual path loss power of the cells of the first to Nth cellular interference links.

According to another embodiment of the present invention, determining the second interference path loss power according to the determined cellular actual path loss power includes a processing mode (f2): calculating a determined harmonic mean value of the actual path loss power of the cell, and calculating The harmonic mean value is used as the second interference path loss power.

For example, you can calculate a harmonic mean using the following formula:

among them a linear value representing the first interference path loss power; N represents the number of D2D interference links; A linear value representing the actual path loss power of the cells of the first to Nth cellular interference links.

According to still another embodiment of the present invention, determining the second interference path loss power according to the determined cellular actual path loss power includes a processing mode (f3): calculating a determined linear combined average value of the cellular actual path loss power, and calculating The obtained linear combination average value is taken as the second interference path loss power.

For example, you can use the following formula to calculate a linear combination average:

among them a linear value representing the first interference path loss power; N represents the number of D2D interference links; A linear value representing the actual path loss power of the cells of the first to Nth cellular interference links; ω ₁ ,..., ω _N are the weights of the corresponding cellular interference links, and ω ₁ +...+ ω _N =1.

The second interference path loss power determined by (f1) is for suppressing interference on the most interfered link in the cellular interference link; (f2) the determined second interference path loss power is for coordinating suppression of all cellular interference chains. Interference on the road; (f3) suppressing interference on all cellular interference links based on the weight of different cellular interference links. For example, an interference link with lower interference tolerance can be assigned a higher weight, and so on.

It will be appreciated by those skilled in the art that in calculating the harmonic mean and the linear mean, for computational accuracy, in one embodiment, the linearity of the actual path loss power of the cellular using each cellular interference link is required. The value is calculated and the resulting second interference path loss power is also a linear value. When the second path loss power is subsequently determined, the second The linear value of the disturbance path loss power is logarithmically obtained as a logarithmic representation of the commonly used power (eg, in dB). However, in some embodiments, the processing mode (f1) is not limited to selecting a linear value or a logarithmic value of the actual path loss power of the cell when selecting the maximum cellular actual path loss power.

It will be appreciated that the above-described process for determining the second interference path loss power based on the determined cellular path loss power is merely exemplary and illustrative. Embodiments of the invention are not limited to the specific treatments disclosed herein. Those skilled in the art can employ other suitable (existing or future developed) methods to determine the second interference path loss power in accordance with the teachings of the present specification.

After determining the first interference path loss of the D2D interference link and the second interference path loss of the cellular interference link, the second path loss power of the interference link can be determined accordingly. According to an embodiment of the present invention, the first interference path loss and the second interference path loss may be directly summed to obtain a second path loss power. According to another embodiment of the present invention, different weights may be assigned to the first interference path loss and the second interference path loss, and the linear combination average of the two is calculated as the second path loss power.

The method 300 proceeds to step S303 after step S302. At step S303, the estimated transmit power is determined based on the first path loss power and the second path loss power. According to an embodiment of the present invention, the first path loss power and the second path loss power may be directly summed to obtain an estimated transmission power. Optionally, according to another embodiment of the present invention For the first path loss power and the second path loss power, different weights are assigned, and the linear combination average of the two is calculated as the estimated transmission power.

Optionally, in some other implementation manners of the present invention, the system parameter is also considered, and determining the estimated transmit power according to the first path loss power and the second path loss power includes: according to the first path loss power, The second path loss power and system parameters determine the estimated transmit power. The system parameters include one or more of the following: a predetermined open loop power control parameter, a number of allocated resource blocks on the D2D desired link, a transmission format compensation, and a predetermined closed loop power control parameter. These system parameters are pre-configured or available in the system. In one embodiment, the estimated transmit power can be determined using the following exemplary formula:

Where P _Estimated represents the estimated transmit power, and P ₀ represents a predetermined open loop power control parameter; Indicates the first path loss power; Indicates the first interference path loss power, Indicates the second interference path loss power, The overall representation of the second interference path loss power; R represents the number of allocated resource blocks on the D2D desired link; Δ _TF represents the compensation of the transmission format; f (Δ) represents the predetermined closed-loop power control parameters; α , β , λ , μ represent Scheduled parameters.

In one embodiment, Can be a linear value in the above formulas (1) to (3) dB value, Can be a linear value in the above formulas (4) to (6) dB value, Can be a linear value in the above formulas (7) to (9) The dB value.

It will be understood that the above formula is merely an exemplary and non-limiting way of calculating the estimated transmit power, and embodiments of the present invention are not limited to the specific formula disclosed herein. Those skilled in the art, in accordance with the teachings of the present specification, may employ other suitable (existing or future developed) methods to determine the estimated transmit power based on the first path loss power and the second path loss power.

Next, method 300 proceeds to step S304. At step S304, a smaller power is selected as the transmission power from the maximum available transmission power and the estimated transmission power. Since the estimated transmission power weighs the communication quality of the D2D desired link and the interference condition of the interference link, if the estimated transmission power is less than the maximum available transmission power, selecting the estimated transmission power as the transmission power will effectively suppress the D2D. The interference generated in the communication can also guarantee the communication quality of the D2D desired link. Of course, if the estimated transmit power is greater than the maximum available transmit power, the maximum available transmit power should be selected as the transmit power to achieve the purpose of weighing the communication quality of the D2D desired link and the interference suppression of the interference link.

The above method 300 suppresses interference by controlling the transmission power of the user equipment at the transmitting end, which is a method for suppressing interference instantaneously during D2D communication. It can be understood that the above method 300 can be used in the user equipment as the transmitting end in any D2D communication.

However, when the method 300 is used to suppress interference, it indicates that there is already interference in the system. If the interference on the interference link is too large, the method 300 may not effectively suppress the interference. Therefore, further, the present invention Embodiments also provide methods for proactively suppressing interference prior to the generation of interference.

According to an embodiment of the present invention, before the method 300, when the user equipment of the transmitting end and each user equipment of the receiving end satisfy the D2D communication condition, the D2D desired link is established with the user equipment of the receiving end. . In this embodiment, by considering whether the user equipment of the transmitting end and the receiving end of the D2D desired link meets certain D2D communication conditions before the D2D desired link is established, these D2D communication conditions can well constrain the desired link in the D2D. It does not cause excessive interference after it is established, that is, it is used as a method of proactively suppressing interference.

When using a user example in which multiple D2D desired links exist, such as multicast, broadcast, or relay retransmission, it is difficult to give an appropriate judgment criterion to determine that multiple D2D desired links can be established. Therefore, in an exemplary embodiment of the present invention, a case where the D2D desired link is one, that is, a case of one-to-one unicast D2D communication is considered. Each of the user equipment of the transmitting end and the user equipment of the receiving end needs to satisfy a combination of one or more of the following D2D communication conditions (g1) to (g6):

(g1) The third RSRP of the D2D desired link is greater than or equal to the fourth RSRP of the link between each user equipment and the base station of the cell in which it is located.

The condition (g1) considers the communication quality on the D2D desired link. When the third RSRP is greater than or equal to the fourth RSRP of the link between each user equipment and the base station of the cell in which it is located, each user equipment is The communication quality on the D2D expected link is better than the communication quality of each user equipment and the base station of the cell in which it is located, so the D2D desired link can be established.

(g2) The third predetermined ratio of the third RSRP is greater than or equal to a fifth RSRP of a link between each user equipment and a receiving end of a cellular link using the same resource block as the D2D desired link.

The condition (g2) considers the interference of each user equipment interfered with by the interfering link. Here, the interfering link is considered to be the link between the transmitting end of the cellular link in which each user equipment uses the same resource block as the D2D desired link. If the third RSRP of the first predetermined ratio is greater than or equal to the fifth RSRP of each user equipment on the interference link, indicating that the interference on the interference link is within the allowable range, the D2D desired link may be established.

(g3) The second predetermined ratio of the sixth RSRP is greater than or equal to the fourth RSRP, wherein the sixth RSRP is the RSRP of the cellular link using the same resource block as the D2D desired link.

The condition (g3) considers the communication quality of the cellular link in the cellular network. The interference of each user equipment in the established D2D desired link to the receiving end of the cellular link should not cause excessive interference to the communication quality of the cellular link. The sixth RSRP indicates the communication quality of the cellular link. If the sixth RSRP of the second predetermined ratio is greater than the fourth RSRP, indicating that the interference of the established D2D desired link to the cellular link is within the allowable range, the D2D expected chain may be established. road.

(g4) The CQI (Channel Quality Indicator) of the link between each user equipment and the base station of the cell in which it is located is less than a first preset threshold.

The condition (g4) considers the CQI of the link between each user equipment in the base station of the cell in which it is located within a predetermined period of time, if the CQI is large If the communication quality of the link between each user equipment and the base station of the cell in which the cell is located is good, the D2D desired link does not need to be established, because the D2D desired link is used to suppress interference. Power control as in method 300 and resource configuration as provided below are required. If the CQI is less than the first predetermined threshold, a D2D desired link can be established.

(g5) The number of resource blocks allocated on the D2D desired link is less than a second predetermined threshold.

The condition (g5) takes into account the number of resource blocks that need to be allocated on the D2D desired link. If the number of resource blocks that need to be allocated on the D2D desired link is greater than or equal to a second predetermined threshold, then there is no need to establish a D2D desired link. The D2D desired link may be established if the number of resource blocks allocated on the D2D desired link is less than a second predetermined threshold.

(g6) The total spectrum utilization after establishing the D2D desired link is greater than or equal to the total spectrum utilization before establishing the D2D desired link.

The condition (g2) considers the total spectrum utilization before and after the D2D desired link is established. If the total spectrum utilization is increased after the D2D desired link is established, the D2D desired link can be established. In one embodiment, the specific determination of the total spectrum utilization can be referred to equation (10) or (11), which will be discussed in detail below.

In some embodiments, the D2D desired link may be established when each of the user equipment at the transmitting end and the user equipment at the receiving end needs to satisfy any of the conditions of the D2D communication conditions (g1) to (g6). In other embodiments, each user equipment in the user equipment at the transmitting end and the user equipment at the receiving end may need to satisfy D2D communication. The D2D desired link is established when any combination of a plurality of conditions of conditions (g1) to (g6).

In accordance with an embodiment of the present invention, prior to method 300, and after establishing the D2D desired link as described above, a resource block needs to be allocated for the established D2D desired link. It can be known that if the resource blocks allocated on the D2D desired link are shared with other more D2D links or cellular links, the interference in the system is larger. Therefore, in order to effectively suppress interference while considering the utilization of resource blocks, according to an embodiment of the present invention, the following method of allocating resource blocks is provided: before determining the maximum available transmit power, for any resource block, in the second When the sum rate is greater than or equal to the first sum rate, the resource block is allocated to the D2D desired link.

Wherein the first sum rate is a sum rate of the other D2D link and the cellular link when the resource block is allocated to other D2D links and cellular links without being allocated to the D2D desired link; The second sum rate is when the resource block is allocated to the other D2D link and the cellular link, and the resource block is reassigned to the D2D desired link, the other D2D link, the cellular link, and the The sum rate of the desired link of D2D.

The sum data rate can be calculated based on the signal interference noise ratio on the D2D link and the cellular link. But since the second sum rate is an estimate of the sum rate in such a case before allocating the resource block to the D2D desired link. Since the resource block has not been actually allocated to the D2D desired link at this time, the actual signal interference noise ratio cannot be obtained. Therefore, according to an embodiment of the present invention, the first sum rate is based on the RSRP of the other D2D link and each link in the cellular link and its interference link. The RSRP determined sum rate; the second sum rate is a sum rate determined according to the RSRP of each of the other D2D links, the cellular link, and the RSRP of each of the D2D desired links and its interfering link. The RSRP of each link can be used as the signal receiving power, and the sum of the RSRPs on the interference link is used as the noise receiving power, thereby estimating the second sum rate. In another embodiment, the noise receiving power may also include the received power of the Gaussian white noise.

In the exemplary embodiment of the present invention, it is difficult to determine and rate for the case of a plurality of D2D desired links, so the case where the D2D desired link is one is considered here. In one embodiment, the first sum rate and the second sum rate can be calculated using the following formula:

Where equation (10) is used to calculate the first sum rate and equation (11) is used to calculate the second sum rate. R _before1 represents the first sum rate; R _after2 represents the second sum rate; P represents the number of other D2D links and cellular links to which the resource block has been allocated before the resource block is allocated to the D2D desired link; P+1 after the allocation of the resource blocks indicates a desired D2D link, other D2D link has been assigned the resource block, the number of links and the D2D desired cellular link; RSRP of _k denotes the k-th receiving terminal in its own desired D2D RSRP on the link; RSRP _i,k represents the RSRP on the link between the kth receiver and the ith sender of the interference link, i is not equal to k; N ₀ represents Gaussian white noise.

It will be understood that the above formula is merely exemplary and non-limiting ways of calculating the first sum rate and the second sum rate, and embodiments of the invention are not limited to the specific formulas disclosed herein. Those skilled in the art can employ other suitable (existing or future developed) methods to calculate the first sum rate and the second sum rate in accordance with the teachings of the present specification.

After determining the first sum rate and the second sum rate, determining a size of the first sum rate and the second sum rate, if the second sum rate is greater than the first sum rate, indicating that the resource block is allocated to the D2D desired link To increase the sum rate of the system, the resource block can be allocated to the D2D desired link.

FIG. 4 schematically illustrates a block diagram of a user equipment 400 for implementing a method of suppressing interference therein, in accordance with one embodiment of the present invention. In some embodiments, the user device 400 can be a mobile phone, a tablet, a portable notebook, a laptop, and the like. As shown in FIG. 4, the acquiring device 401 is configured to obtain a maximum available transmit power, and the first determining device 402 is configured to determine a first path loss power of the at least one device of the user equipment at the receiving end to the desired link of the device D2D, and Determining a second path loss power of the at least one interfering link; a second determining means 403 for determining an estimated transmit power based on the first path loss power and the second path loss power; and selecting means 404 for This maximum is available A smaller power is selected as the transmission power among the transmission power and the estimated transmission power.

It can be seen that the user device 400 of FIG. 4 can implement the method as shown in FIG. 3, and although not further illustrated, the user device 400 can include more devices or functional units to implement the method 300 described in connection with FIG. Various types of units of the various steps of the method described in the various embodiments.

Exemplary embodiments of the present invention have been described above with reference to the flowcharts and block diagrams shown in the drawings. It should be noted that the method disclosed in the embodiments of the present invention can be implemented in a soft body, a hard body, or a combination of a soft body and a hard body. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or personal computer (PC). In some embodiments, the invention is implemented as a software including, but not limited to, a firmware, resident software, microcode, and the like.

Moreover, embodiments of the invention may take the form of a computer program product accessible from a computer-usable or computer-readable medium that provides code for use by or in connection with a computer or any instruction execution system. For the purposes of this description, a computer-usable or computer-readable mechanism can be any tangible device that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

The medium can be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system (or apparatus or device) or a propagation medium. Examples of computer readable media include semiconductor or solid state memory, magnetic tape, removable computer magnetic disks, random access memory (RAM), read only memory (ROM), hard magnetic disks, and optical disks. Examples of current optical discs include optical discs - read-only memory (CD-ROM), recordable disc-read/write (CD-R/W) and DVD.

It should be noted that the description of the present invention has been presented for purposes of illustration and description, and is not intended to Many modifications and variations are possible to those skilled in the art. The embodiment was chosen and described in order to explain the embodiments of the invention and the embodiments of the invention It is within the scope of the invention as defined by the scope of the patent.

Claims (24)

A method for suppressing interference in a user equipment at a transmitting end, comprising: acquiring a maximum available transmit power; determining a first path loss power of a device to a D2D desired link of the user equipment at the receiving end, and determining at least one interference link Second path loss power; determining estimated transmit power based on the first path loss power and the second path loss power; and selecting a smaller power from the maximum available transmit power and the estimated transmit power as the transmit power . The method of claim 1, wherein determining the first path loss power of the at least one D2D desired link to the user equipment of the receiving end comprises: determining the first of each D2D desired link of the user equipment to the receiving end Estimating the path loss power; and determining the first path loss power based on the determined first estimated path loss power. The method of claim 2, wherein determining the first estimated path loss power of each D2D desired link to the user equipment at the receiving end comprises: acquiring each D2D desired link of the user equipment to the receiving end The first reference signal receives power RSRP, and determines a first estimated path loss power of each D2D desired link according to the first RSRP; or A first distance between the user equipments at the receiving end of each of the D2D desired links is determined, and a first estimated path loss power for each of the D2D desired links is determined based on the first distance. The method of claim 2, wherein determining the first estimated path loss power of each D2D desired link to the user equipment at the receiving end comprises: receiving the first predetermined transmission by the user equipment in the first geographical range a first reference signal transmitted by the power, and determining a received power of the first reference signal, wherein the user equipment of the transmitting end knows the first predetermined transmit power in advance; according to the first predetermined transmit power and each of the first reference signals Receiving power to determine a D2D actual path loss power of a link between the user equipment in the first geographical range and the user equipment in the transmitting end; and including at least one of the user equipments in the first geographical range The D2D actual path loss power of each user equipment in the D2D desired link and the user equipment of the transmitting end is the first estimated path loss power of each D2D desired link. The method of claim 2, wherein determining the first estimated path loss power of each D2D desired link to the user equipment at the receiving end comprises: transmitting the second reference signal by using the second predetermined transmission power, and determining Receiving power of the user equipment that receives the second reference signal; determining, according to the second predetermined transmission power and the received power of each user equipment that receives the second reference signal, that each of the second parameters is received And a D2D actual path loss power of the link between the user equipment of the test signal and the user equipment of the sender; and each of the user equipments that receive the second reference signal included in the at least one D2D desired link The D2D actual path loss power of the link between the user equipment and the user equipment of the sender is the first estimated path loss power of each D2D desired link. The method of any one of claims 2 to 5, wherein determining the first path loss power based on the determined first estimated path loss power comprises: determining the first estimated path loss The largest first estimated path loss power in power is determined as the first path loss power; the determined average of the first estimated path loss power is calculated, and the calculated harmonic average is used as the first path loss Power; or calculating a determined linear combined average of the first estimated path loss power, and using the calculated linear combined average as the first path loss power. The method of claim 1, wherein the interference link comprises a D2D interference link consisting of a receiving end of another D2D link using the same resource block as the D2D desired link and a user equipment of the transmitting end, And/or a cellular interference link consisting of a receiving end of a cellular link using the same resource block as the D2D desired link and a user equipment of the transmitting end, wherein the second path loss power packet of the at least one interfering link is determined Include: determining a first interference path loss power of the D2D interference link, and/or determining a second interference path loss power of the cellular interference link; according to the first interference path loss power and/or the second interference path loss Power determines the second path loss power. The method of claim 7, wherein determining the first interference path loss power of the D2D interference link comprises: determining a second estimated path loss power of each D2D interference link; and determining the first Second, the path loss power is estimated to determine the first interference path loss power. The method of claim 8, wherein determining the second estimated path loss power of each D2D interference link comprises: acquiring a second RSRP on each D2D interference link, and determining according to the second RSRP a second estimated path loss power of each D2D interference link; or a second distance between the user equipments of the receiving end of each D2D interference link, and determining each D2D interference link according to the second distance The second estimated path loss power. The method of claim 8, wherein determining the second estimated path loss power of each D2D interference link comprises: receiving a first reference sent by the user equipment in the first geographical range by using the first predetermined transmit power And determining a received power of the first reference signal, wherein the user equipment at the transmitting end knows the first predetermined transmission in advance Power; determining, according to the first predetermined transmit power and the received power of each first reference signal, a D2D actual path loss power of a link between the user equipment in the first geographical range and the user equipment in the transmitting end; The user equipment in the first geographical range includes a user equipment other than the user equipment of the at least one D2D desired link and a user equipment of the transmitting end to form a D2D interference link; and each D2D interference link The D2D actual path loss power is determined as the second estimated path loss power of each D2D interference link. The method of claim 8, wherein determining the second estimated path loss power of each D2D interference link comprises: transmitting the second reference signal with the second predetermined transmit power, and determining to receive the second reference Receiving power of the user equipment of the signal; determining, according to the second predetermined transmission power and the received power of the user equipment that receives the second reference signal, each user equipment that receives the second reference signal and the transmitting The D2D actual path loss power of the link between the end user equipments; wherein the user equipment receiving the second reference signal includes other user equipments other than the user equipment of the at least one D2D desired link and the transmitting end a D2D interference link composed of user equipments; and determining a D2D actual path loss power of each D2D interference link as a second estimated path loss power of each D2D interference link. The method of any one of clauses 8 to 11, wherein the first estimated path loss power is determined according to the determined An interference path loss power includes: determining a second estimated path loss power that is the smallest of the determined second estimated path loss powers as the first interference path loss power; and calculating the determined second estimated path loss power Harmonizing the average value, and calculating the calculated harmonic mean value as the first interference path loss power; or calculating the determined linear combined average value of the second estimated path loss power, and calculating the calculated linear combination average value As the first interference path loss power. The method of claim 7, wherein determining the second interference path loss power of the cellular interference link comprises: determining a cellular actual path loss power of each of the cellular interference links; and determining the actual path of the cellular according to the determined The power is lost to determine the second interference path loss power. The method of claim 13, wherein determining the actual path loss power of each of the cellular interference links comprises: receiving a third reference signal transmitted by the receiving end of each of the cellular interference links using a third predetermined transmit power The user equipment of the transmitting end knows the third predetermined transmission power in advance; determines the received power of the received third reference signal; and receives the received power of the third reference signal and the third predetermined transmission power. To determine the cellular actual path loss power of each cellular interference link. The method of claim 13 or 14, wherein determining the second interference path loss power according to the determined actual path loss power of the cell comprises: determining a minimum actual cellular path of the actual path loss power of the cell. The power loss is determined as the second interference path loss power; the determined harmonic average value of the actual path loss power of the cell is calculated, and the calculated harmonic average value is used as the second interference path loss power; or the determined determined cell is A linear combined average of the actual path loss powers, and the calculated average of the linear combinations is taken as the second interference path loss power. The method of claim 4, wherein receiving the first reference signal transmitted by the user equipment in the first geographical range by using the first predetermined transmit power comprises: using a pre-configured transmit power broadcast measurement request, and The user equipment that receives the measurement request is defined as a user equipment in the first geographical range; and receives the first reference signal that is sent by the user equipment in the first geographical range by using a first predetermined transmission power. The method of claim 4, wherein receiving the first reference signal sent by the user equipment in the first geographical range by using the first predetermined transmit power comprises: receiving the user equipment in the first geographical range and receiving After the measurement request sent by the base station of the cell where the user equipment of the transmitting end is located, The first reference signal sent by the predetermined transmit power; wherein the base station of the cell where the user equipment of the transmitting end is located knows in advance the geographical location of the user equipment in the first geographical range. The method of claim 17, wherein the user equipment in the first geographical range receives the measurement request sent by the base station of the cell where the user equipment of the transmitting end is located, and sends the first predetermined transmission power. The first reference signal includes: when the user equipment in the first geographical range is located in a cell where the user equipment of the sending end is located, receiving, by the user equipment in the first geographical range, the user equipment that receives the sending end The first reference signal sent by the first predetermined transmit power after the measurement request sent by the base station of the cell is directly received; the user equipment in the first geographical range is not located in the cell where the user equipment of the transmitting end is located Receiving, by the user equipment in the cell in the first geographical range, the user equipment in the cell where the transmitting end is located, after receiving the measurement request directly sent by the base station of the cell where the user equipment of the transmitting end is located, adopting the first reservation Transmitting the first reference signal sent by the power, and receiving the user equipment in the first geographical range except located in the The other user equipments other than the cell in which the transmitting end is located are firstly transmitted by the base station of the cell in which the user equipment of the transmitting end is located to the base station of the predetermined neighboring cell, and then forwarded by the base station of the predetermined neighboring cell. The first reference signal transmitted using the first predetermined transmit power after the measurement request. The method of claim 1, wherein the estimated transmission is determined based on the first path loss power and the second path loss power Transmitting power includes: determining the estimated transmit power according to the first path loss power, the second path loss power, and system parameters; wherein the system parameter comprises one or more of the following: a predetermined open loop power control parameter, the D2D The number of allocated resource blocks on the link, the compensation of the transport format, and the predetermined closed loop power control parameters are expected. The method of claim 1, wherein before determining the maximum available transmission power, when the user equipment at the transmitting end and each user equipment in the receiving end satisfy the D2D communication condition, The user equipment establishes the D2D desired link. The method of claim 20, wherein the D2D desired link is one, and each of the user equipment of the transmitting end and the user equipment of the receiving end meets one or more of the following D2D communication conditions. Combination: the third RSRP of the D2D desired link is greater than or equal to a fourth RSRP of a link between each user equipment and a base station of the cell in which the cell is located; the first predetermined ratio of the third RSRP is greater than or equal to each user equipment and a fifth RSRP of a link between the receiving end of the cellular link using the same resource block as the D2D desired link; a sixth predetermined RSRP of the second predetermined ratio is greater than or equal to the fourth RSRP, wherein the sixth RSRP is The D2D expects the link to use the RSRP of the cellular link of the same resource block; the channel quality indicator CQI of the link between each user equipment and the base station of the cell in which it is located is less than a first preset threshold; The number of resource blocks allocated on the D2D desired link is less than a second predetermined threshold; the total spectrum utilization after establishing the D2D desired link is greater than or equal to the total spectrum utilization before establishing the D2D desired link. According to the method of claim 1, before the maximum available transmission power is determined, for any resource block, when the second sum rate is greater than or equal to the first sum rate, the resource block is allocated to the D2D desired link. Where the first sum rate is the sum rate of the other D2D link and the cellular link when the resource block is allocated to other D2D links and cellular links without being assigned to the D2D desired link; a second sum rate is the other D2D link, the cellular link, and the case where the resource block is reassigned to the D2D desired link when the resource block is allocated to the other D2D link and the cellular link The sum rate of the desired link of the D2D. The method of claim 22, wherein the D2D desired link is one, and the first sum rate is an RSRP according to the other D2D link and each link in the cellular link and its interference The RSRP determined sum rate on the link; the second sum rate is determined according to the RSRP of each of the other D2D links, the cellular link, and the RSRP of each of the D2D desired links and its interfering link rate. a user equipment, comprising: acquiring means, configured to obtain a maximum available transmit power; and first determining means, configured to determine a first path loss power of the at least one device of the user equipment at the receiving end to the desired link of the device D2D, and And determining a second path loss power of the at least one interference link; the second determining means, configured to determine the estimated transmit power according to the first path loss power and the second path loss power; and selecting means for using the A smaller power is selected as the transmission power among the maximum available transmission power and the estimated transmission power.