CN104105189B - A kind of Poewr control method, system and the equipment of D2D transmission - Google Patents

A kind of Poewr control method, system and the equipment of D2D transmission Download PDF

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CN104105189B
CN104105189B CN201310127988.3A CN201310127988A CN104105189B CN 104105189 B CN104105189 B CN 104105189B CN 201310127988 A CN201310127988 A CN 201310127988A CN 104105189 B CN104105189 B CN 104105189B
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transmission power
transmission
upper limit
limit value
power
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CN104105189A (en
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高秋彬
赵锐
彭莹
陈文洪
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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Priority to PCT/CN2014/075134 priority patent/WO2014166416A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/383—TPC being performed in particular situations power control in peer-to-peer links

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses Poewr control method, system and the equipment of a kind of D2D transmission, this method includes：Terminal device determines D2D transimission power upper limit values, and determine D2D transimission powers it is unrestricted under the conditions of corresponding D2D transimission powers；Terminal device determines interference allowance using the D2D transimission powers upper limit value and the D2D transimission powers D2D transimission powers corresponding under the conditions of unrestricted；The interference allowance is sent to base station equipment by terminal device, and the D2D transmission power parameters transmitted are adjusted using the interference allowance by the base station equipment.In the embodiment of the present invention, terminal device can determine interference allowance by D2D transimission powers upper limit value and D2D transimission powers D2D transimission powers corresponding under the conditions of unrestricted, and interference allowance is sent to base station equipment, by base station equipment using allowance is disturbed to be adjusted the D2D transmission power parameters transmitted, controlled so as to the D2D transimission powers to terminal device.

Description

Power control method, system and equipment for D2D transmission
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a system, and a Device for controlling power of D2D (Device to Device) transmission.
Background
In the conventional cellular communication technology, a data communication flow between two terminal devices may be as shown in fig. 1, that is, services such as voice and data between two terminal devices need to interact through an eNB (i.e., a base station device) and a core network that each resides in the eNB. Further, the D2D technology (i.e., terminal direct technology) refers to that data transmission can be directly performed between adjacent terminal devices through a direct link within a short distance, without forwarding through a central node (i.e., eNB), as shown in fig. 2.
The short-range communication characteristic and the direct communication mode of the D2D technology have the following advantages: (1) the terminal equipment can realize higher data rate, lower delay and lower power consumption by direct near field communication; (2) the short-distance characteristics of terminal equipment and a D2D communication link which are widely distributed in the network are utilized, so that the effective utilization of frequency spectrum resources can be realized; (3) the direct communication mode of the D2D can adapt to the local data sharing requirement of the service such as wireless P2P and the like, and provides data service with flexible adaptability; (4) the direct communication of the D2D can utilize the terminal equipment with huge number and wide distribution in the network to expand the coverage of the network.
In an LTE (Long Term Evolution ) system, the D2D technology refers to a D2D communication process that operates on an LTE authorized frequency band and is controlled by the LTE system; the method fully exerts the technical advantages of D2D, and the control of the LTE system can overcome some problems of the traditional D2D technology, such as uncontrollable interference and the like.
When the D2D communication is introduced to the licensed band of the LTE system, the D2D communication link shares radio resources with cellular communication, and the sharing of radio resources may be orthogonal sharing or multiplexing sharing. The method for sharing the wireless resources in the orthogonal mode comprises the following steps: the wireless resource is divided into orthogonal in a static or dynamic mode, and the orthogonal resources are used for cellular communication and D2D communication; the sharing of radio resources by multiplexing means is: D2D communication makes shared reuse of the cellular resources being used in a reasonable way and limits interference to a certain level.
D2D communication and cellular communication cause interference with each other when they reuse the same radio resources. Taking multiplexing cellular uplink resources as an example, as shown in fig. 3, a schematic diagram of an interference situation of multiplexing LTE resources for D2D communication is shown; the first interference is interference of a D2D signal to a cellular signal, which affects the quality of cellular communication, and the strength of the first interference depends on the power of the D2D transmission and the distance from the D2D transmitting end to the base station equipment; the second type of interference is interference of the cellular signal to the D2D signal, the strength of which depends on the distance from the cellular transmitting end to the D2D receiving end, and cellular transmissions that are close to the D2D receiving end will cause strong interference to the D2D.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the resource of the D2D transmission multiplexing cellular transmission is based on the premise that the quality of the cellular transmission is not affected, and therefore the first interference (i.e. the interference of the D2D signal to the cellular signal) needs to be controlled, but in the prior art, there is no suitable way for controlling the first interference.
Disclosure of Invention
Embodiments of the present invention provide a method, a system, and a device for controlling power of D2D transmission, so as to adjust a transmission power parameter of D2D transmission by an interference margin, and control interference of a D2D signal on a cellular signal.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling power of device-to-device D2D transmission, including:
the terminal equipment determines the upper limit value of the D2D transmission power and determines the corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
the terminal equipment determines an interference margin by using the D2D transmission power upper limit value and the corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
and the terminal equipment sends the interference margin to base station equipment, and the base station equipment adjusts the transmission power parameter transmitted by the D2D by using the interference margin.
The embodiment of the invention provides a power control method for device-to-device D2D transmission, which comprises the following steps:
the method comprises the steps that base station equipment receives an interference margin from terminal equipment, wherein the interference margin is determined by the terminal equipment by using a D2D transmission power upper limit value and a corresponding D2D transmission power under the condition that D2D transmission power is not limited;
and the base station equipment adjusts the transmission power parameter of the D2D transmission corresponding to the terminal equipment by using the interference margin.
An embodiment of the present invention provides a power control system for device-to-device D2D transmission, including:
the terminal device is configured to determine an upper limit value of D2D transmission power, determine a D2D transmission power corresponding to the D2D transmission power under the condition that the D2D transmission power is not limited, determine an interference margin by using the upper limit value of D2D transmission power and the D2D transmission power corresponding to the D2D transmission power under the condition that the D2D transmission power is not limited, and send the interference margin to the base station device;
and the base station equipment is used for receiving the interference margin from the terminal equipment and adjusting the transmission power parameter of the D2D transmission corresponding to the terminal equipment by using the interference margin.
An embodiment of the present invention provides a terminal device, including:
a first determining module, configured to determine a device-to-device D2D transmission power upper limit value;
a second determining module, configured to determine a corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
a third determining module, configured to determine an interference margin by using the D2D transmission power upper limit value and a corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
a first sending module, configured to send the interference margin to a base station device, where the base station device adjusts a transmission power parameter of D2D transmission by using the interference margin.
An embodiment of the present invention provides a base station device, including:
a receiving module, configured to receive an interference margin from a terminal device, where the interference margin is determined by using a device-to-device D2D transmission power upper limit value and a corresponding D2D transmission power under a condition that a D2D transmission power is not limited by the terminal device;
and the processing module is configured to adjust a transmission power parameter of D2D transmission corresponding to the terminal device by using the interference margin.
Compared with the prior art, the embodiment of the invention at least has the following advantages: in the embodiment of the present invention, the terminal device may determine an interference margin through the D2D transmission power upper limit value and the corresponding D2D transmission power under the condition that the D2D transmission power is not limited, and send the interference margin to the base station device, and the base station device adjusts the transmission power parameter transmitted by the D2D by using the interference margin (that is, the base station device is assisted by the interference margin to select appropriate open-loop and closed-loop power control parameters), so as to control the D2D transmission power of the terminal device, and then control the interference of the D2D signal to the cellular signal.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of networking in which services such as voice and data between two terminal devices need to perform data interaction through respective resident enbs in the prior art;
fig. 2 is a schematic diagram of networking in which services such as voice and data between two terminal devices do not need to perform data interaction through respective resident enbs in the prior art;
fig. 3 is a schematic diagram of an interference situation of multiplexing LTE resources for D2D communication in the prior art;
fig. 4 is a flowchart of a power control method for D2D transmission according to an embodiment of the present invention;
fig. 5 is a structural diagram of a power control system for D2D transmission according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal device according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station device according to a fourth embodiment of the present invention.
Detailed Description
In order to control the interference of the D2D signal to the cellular signal, one control method is to set the upper limit value of the D2D transmission power so that the transmission power of the D2D transmission is not greater than the upper limit value of the D2D transmission power; therefore, when the terminal equipment calculates the transmission power, the interference suffered by the base station equipment can be ensured to be in a controllable range. However, unreasonable setting of the upper limit of the D2D transmission power may affect the system performance, for example, too high setting of the upper limit of the D2D transmission power may cause high interference to cellular transmission, and too low setting of the upper limit of the D2D transmission power may limit the performance of the D2D transmission. Further, the current base station device does not know how the set upper limit of the D2D transmission power affects the D2D transmission, so that the upper limit of the D2D transmission power cannot be adaptively adjusted, and the transmission power parameter of the D2D transmission cannot be adaptively adjusted.
In view of the above findings, an embodiment of the present invention provides a method, a system, and a device for controlling power of D2D transmission, where a terminal device may determine an interference margin through a D2D transmission power corresponding to a D2D transmission power unlimited condition and an upper limit value of the D2D transmission power, and send the interference margin to a base station device, and the base station device adaptively adjusts a transmission power parameter transmitted by D2D by using the interference margin (that is, the base station device is assisted by the interference margin to select appropriate open-loop and closed-loop power control parameters), so as to control the D2D transmission power of the terminal device, and then control interference of a D2D signal on a cellular signal.
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
In the method, by introducing an IHR (Interference margin), a base station apparatus adaptively adjusts a transmission power parameter transmitted by D2D by using the Interference margin (i.e., the base station apparatus is assisted by the Interference margin to select appropriate open-loop and closed-loop power control parameters), so as to control the D2D transmission power of a terminal apparatus, and then control the Interference of a D2D signal on a cellular signal. As shown in fig. 4, the method comprises the steps of:
step 401, the terminal device (D2D terminal device) determines the upper limit value of D2D transmission power, where the unit of the upper limit value of D2D transmission power is [ dBm ]; the D2D transmission power upper limit value may be obtained from configuration information of the base station device, or may be calculated from an interference power upper limit value set by the base station device.
In this embodiment of the present invention, the determining, by the terminal device, the upper limit value of the D2D transmission power includes, but is not limited to:
firstly, the terminal equipment receives configuration information from the base station equipment, and determines the upper limit value of the D2D transmission power by using the configuration information; specifically, when the configuration information includes the D2D transmission power upper limit value, the terminal device may directly obtain the D2D transmission power upper limit value from the configuration information; or, when the configuration information includes a back-off value X of the D2D transmission power relative to the cellular transmission power, the terminal device determines that the upper limit value of the D2D transmission power is PCELL(i) -X; wherein, PCELL(i) Is the transmission power value of the cellular transmission of the ith sub-frame calculated according to the cellular transmission power control mechanism.
In the embodiment of the present invention, in the first mode, the base station device needs to determine the configuration information corresponding to the terminal device (for example, the upper limit value of the transmission power of the base station device configuration D2D or the back-off value of the transmission power of the base station device configuration D2D with respect to the cellular transmission power is X [ dB ]]) And the configuration information corresponding to the terminal equipment needs to be sent to the terminal equipment; then, the terminal device calculates the upper limit value of the transmission power of D2D as PCELL(i)-X[dBm]And P isCELL(i) Is the transmission power value of the cellular transmission or directly determines the D2D transmission power upper limit value.
Secondly, the terminal equipment receives an interference power upper limit value from the base station equipment, and determines a D2D transmission power upper limit value by using the interference power upper limit value; the interference power upper limit value is specifically a maximum interference value generated by D2D transmission allowed by the base station device for cellular transmission, and the D2D transmission power upper limit value is specifically a maximum transmission power at which the interference generated for cellular transmission does not exceed the interference power upper limit value.
In the embodiment of the present invention, in the second mode, the base station device determines an upper limit value of interference power corresponding to the terminal device (that is, a maximum interference value generated by D2D transmission allowed by the base station device for uplink cellular transmission), and sends the upper limit value of interference power corresponding to the terminal device; the interference power upper limit value and the path loss from the terminal device to the base station device are used by the terminal device to determine the D2D transmission power upper limit value.
The base station device determines an interference power upper limit value corresponding to the terminal device, which specifically includes but is not limited to the following modes: and the base station equipment determines the interference power upper limit value corresponding to the terminal equipment by using the measured uplink total interference power and/or the measured cellular transmission signal power. Specifically, the base station device determines that the interference power upper limit value corresponding to the terminal device is the uplink total interference power back-off M [ dB ]]dB is the unit of M; or the base station equipment determines that the upper limit value of the interference power corresponding to the terminal equipment is the cellular transmission signal power back-off N [ dB ]]dB is the unit of N; the values of M and N can be set according to actual experience values. For example, assume that the uplink total interference power measured by the base station device is PInterf_All[dBm]Then the base station device may directly determine that the interference power upper limit value corresponding to the terminal device is PInterf_All-M[dBm]。
The step of determining the upper limit value of the transmission power of the D2D by the terminal device by using the upper limit value of the interference power and the path loss from the terminal device to the base station device comprises the following steps: the terminal device calculates the D2D transmission power upper limit value using the following formula:
wherein, PLM,D2D(i) Is the D2D transmission power upper limit value within the ith subframe,is an interference power upper limit value, and has a unit of [ dBm]PL is a path loss from the terminal device to the base station device, α is a compensation factor, 0 ≦ α ≦ 1, and α ≦ 1 is a complete compensation for the path loss, and a value of α is notified to the terminal device by the base station device or takes a predetermined fixed value, for example, α ≦ 1.
In the above formula, a is 0 or a is 10log10(MD2D(i) And a is 0 corresponding to the upper limit value of the transmission power of D2D transmission per unit bandwidth, a is 10log10(MD2D(i) Correspondingly calculated is the transmission power upper limit value of the D2D transmission; this will be described in detail below.
When A is 10log10(MD2D(i) In time of P)LM,D2D(i) Is a transmission power upper limit value on the D2D transmission bandwidth within the ith subframe,an interference power upper limit value on a bandwidth corresponding to one basic bandwidth unit, the unit of which is [ dBm]；MD2D(i) Bandwidth of D2D transmission for the ith subframe, i.e., MD2D(i) Bandwidth for D2D transmission, and a certain bandwidth is used as a basic bandwidth unit; for example, if the bandwidth of one PRB (Physical Resource Block) is used as the basic bandwidth unit, M isD2D(i) The bandwidth transmitted for D2D contains the number of basic bandwidth units.
When A is 0, PLM,D2D(i) Is a transmission power upper limit value on the D2D transmission bandwidth within the ith subframe,transport bandwidth dried for D2DUpper limit of interference power in dBm](ii) a Or, when a is 0, PLM,D2D(i) Is the D2D transmission power upper limit value on one basic bandwidth unit within the ith subframe,an upper limit value of interference power on a bandwidth corresponding to one basic bandwidth unit is [ dBm]。
In this embodiment of the present invention, the upper limit value of the interference power is an upper limit value of the interference power over a certain bandwidth, which may be an upper limit value of the interference power over a unit bandwidth, for example, an upper limit value of the interference power over a bandwidth corresponding to one PRB, or an upper limit value of the interference power over a corresponding D2D transmission bandwidth, or an upper limit value of the interference power over a full bandwidth. Further, the upper limit value of the D2D transmission power may be an upper limit value of the total power of the whole bandwidth occupied by the D2D transmission, or may be an upper limit value of the power of a unit resource, for example, an upper limit value of the D2D transmission power of the bandwidth corresponding to 1 physical resource block.
Step 402, the terminal device determines the corresponding D2D transmission power under the condition that the D2D transmission power is not limited, that is, the power control mechanism of D2D transmission calculates the D2D transmission power when it is not limited.
In the embodiment of the present invention, the terminal device determines the D2D transmission power corresponding to the condition that the D2D transmission power is not limited, specifically including but not limited to the following modes: the terminal equipment determines the corresponding D2D transmission power under the condition that the D2D transmission power is not limited by the following formula:
PNC,D2D(i)＝B+PO_D2D+αD2D·PLD2D+ΔTF,D2D(i)+fD2D(i)；
wherein, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedO_D2DTarget received power for D2D transmission, αD2D0 is equal to or less than α as a compensation factorD2D≤1，αD2DThe value of (A) is notified to the terminal equipment by the base station equipment, orThe predetermined fixed value is obtained, for example, αD2D=1；PLD2DFor the path loss between the terminal device to the terminal device performing D2D transmission with the terminal device (i.e. two D2D terminal devices), ΔTF,D2D(i) Power adjustment parameter, f, determined for the modulation order of the D2D transmission of the i-th subframeD2D(i) And transmitting the closed-loop adjustment amount of the ith subframe controlled by the closed-loop power control command for the D2D.
In the above formula, B is 0 or B is 10log10(MD2D(i) And B-0 corresponds to an upper limit value of transmission power of D2D transmitted on a bandwidth corresponding to one basic bandwidth unit, B-10 log10(MD2D(i) Correspondingly calculated is the transmission power upper limit value of the D2D transmission; this will be described in detail below.
When B is 10log10(MD2D(i) In time of P)LM,D2D(i) Is a transmission power upper limit value on the D2D transmission bandwidth within the ith subframe,an interference power upper limit value on a bandwidth corresponding to one basic bandwidth unit, the unit of which is [ dBm]；MD2D(i) Bandwidth of D2D transmission for the ith subframe, i.e., MD2D(i) Bandwidth for D2D transmission, and a certain bandwidth is used as a basic bandwidth unit; for example, with the bandwidth of one PRB as the basic bandwidth unit, MD2D(i) The bandwidth transmitted for D2D contains the number of basic bandwidth units.
When B is 0, PLM,D2D(i) Is a transmission power upper limit value on the D2D transmission bandwidth within the ith subframe,for the interference power upper limit value on the D2D transmission bandwidth, the unit is [ dBm](ii) a Or, when B is 0, PLM,D2D(i) Is the D2D transmission power upper limit value on one basic bandwidth unit within the ith subframe,an upper limit value of interference power on a bandwidth corresponding to one basic bandwidth unit is [ dBm]。
In this embodiment of the present invention, the D2D transmission power corresponding to the unlimited D2D transmission power condition may be a total D2D transmission power value on the whole bandwidth occupied by D2D transmission, or may be a D2D transmission power value on a unit resource, for example, a D2D transmission power value on a bandwidth corresponding to 1 physical resource block.
In summary, in the embodiment of the present invention, PLM,D2D(i) And PNC,D2D(i) Are power values on the bandwidth corresponding to one basic bandwidth unit or are power values on the D2D transmission bandwidth.
In step 403, the terminal device determines an interference margin by using the D2D transmission power upper limit value and the corresponding D2D transmission power under the condition that the D2D transmission power is not limited.
For example, in a specific implementation manner, the terminal device may directly determine the interference margin, specifically, the difference between the D2D transmission power upper limit value and the corresponding D2D transmission power under the condition that the D2D transmission power is not limited.
In the embodiment of the present invention, the terminal device determines the interference margin by using the D2D transmission power upper limit value and the D2D transmission power corresponding to the unlimited D2D transmission power condition, which specifically includes but is not limited to the following modes: the terminal device determines the interference margin (which may be in [ dB ]) using the following equation:
IH(i)＝PLM,D2D(i)-PNC,D2D(i) (ii) a Or,
IH(i)＝min{PCMAX,D2D(i),PLM,D2D(i)}-PNC,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-PLM,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-min{PCMAX,D2D(i),PLM,D2D(i)}；
where IH (i) is the interference margin of the ith subframe, PLM,D2D(i) For the upper limit value of the transmission power of D2D in the ith sub-frame (i.e., the determination result of step 401), PNC,D2D(i) P is the D2D transmission power of the ith sub-frame corresponding to the condition that the D2D transmission power is not limited (i.e. the determination result in step 402), andCMAX,D2D(i) the maximum transmission power value for D2D transmission in the ith subframe is corresponding to the terminal device.
Further, when the terminal device does not perform cellular transmission within the subframe of D2D transmission, the terminal device determines PCMAX,D2D(i)＝PCMAX(i)，PCMAX(i) Maximum transmitting power of the terminal equipment in the ith subframe;
when the terminal device is making cellular transmissions within a subframe of a D2D transmission, the terminal device determines
And isWherein,and isPCMAX(i) Maximum transmission power, P, of terminal equipment in ith sub-frameUL(i) Transmit power for uplink cellular transmission of ith subframe, and PUL(i) May include transmission power of a PUCCH (Physical Uplink Control Channel) and a PUSCH (Physical Uplink shared Channel).
Step 404, the terminal equipment sends the interference margin to the base station equipment; specifically, the terminal device performs quantization processing on the interference margin, and sends the interference margin after quantization processing to the base station device.
For example, when the terminal device performs quantization processing on the interference margin, the terminal device may quantize the interference margin to [ 40; -closest values in 1dB steps within 23 dB.
Step 405, the base station device receives the interference margin from the terminal device, and adjusts the transmission power parameter of D2D transmission corresponding to the terminal device by using the interference margin.
The process of adjusting the transmission power parameter transmitted by D2D corresponding to the terminal device by the base station device is a process of selecting a suitable open-loop and closed-loop power control parameter by the base station device, where the open-loop and closed-loop power control parameter may specifically be an upper limit value of D2D transmission power, a target received power transmitted by D2D, and the like.
In this embodiment of the present invention, the adjusting, by the base station device, the transmission power parameter transmitted by D2D corresponding to the terminal device by using the interference margin includes:
case one, when the interference margin is calculated by the terminal device based on the difference between the upper limit of the D2D transmission power and the corresponding D2D transmission power under the condition that the D2D transmission power is not limited (i.e. ih (i) ═ P)LM,D2D(i)-PNC,D2D(i) Or ih (i) ═ min { P { (i) }CMAX,D2D(i),PLM,D2D(i)}-PNC,D2D(i) Then: when the interference margin is a negative value, it indicates that the D2D transmission power has reached the upper limit of the D2D transmission power allowed by the base station device, and at this time, the base station device may adjust the transmission power parameter of the D2D transmission, for example, the base station device increases the upper limit of the D2D transmission power of the D2D transmission corresponding to the terminal device (for allowing the D2D transmission to transmit at a higher power), and/or the base station device decreases the target reception power of the D2D transmission corresponding to the terminal device. When the interference margin is a positive value, the base station device may increase a target received power transmitted by D2D corresponding to the terminal device, and/or increase an MCS (Modulation and coding scheme) level transmitted by D2D corresponding to the terminal device; so that D2D transmission can be made more efficient.
Case two, when the interference margin is calculated by the terminal device based on the difference between the D2D transmission power and the D2D transmission power upper limit under the condition that the D2D transmission power is not limited (i.e. ih (i) ═ P)NC,D2D(i)-PLM,D2D(i) Or IH (i) ═ PNC,D2D(i)-min{PCMAX,D2D(i),PLM,D2D(i) }) then: when the interference margin is a positive value, it indicates that the D2D transmission power has reached the upper limit of the D2D transmission power allowed by the base station device, and at this time, the base station device may adjust the transmission power parameter of the D2D transmission, for example, the base station device increases the upper limit of the D2D transmission power of the D2D transmission corresponding to the terminal device (for allowing the D2D transmission to transmit at a higher power), and/or the base station device decreases the target reception power of the D2D transmission corresponding to the terminal device. When the interference margin is a negative value, the base station device may increase the target received power of D2D transmission corresponding to the terminal device, and/or the base station device may increase the MCS level of D2D transmission corresponding to the terminal device; so that D2D transmission can be made more efficient.
Example two
Based on the same inventive concept as the above method, an embodiment of the present invention further provides a power control system for device-to-device D2D transmission, as shown in fig. 5, where the system includes:
the terminal device 10 is configured to determine an upper limit value of D2D transmission power, determine a D2D transmission power corresponding to the D2D transmission power under the condition that the D2D transmission power is not limited, determine an interference margin by using the upper limit value of D2D transmission power and the D2D transmission power corresponding to the D2D transmission power under the condition that the D2D transmission power is not limited, and send the interference margin to the base station device 20;
the base station device 20 is configured to receive the interference margin from the terminal device 10, and adjust the transmission power parameter of the D2D transmission corresponding to the terminal device 10 by using the interference margin.
In this embodiment of the present invention, the terminal device 10 is specifically configured to receive configuration information from the base station device 20, and determine the upper limit value of the D2D transmission power by using the configuration information; or, receiving an interference power upper limit value from the base station device 20, and determining the D2D transmission power upper limit value by using the interference power upper limit value; the interference power upper limit value is the maximum interference value generated by the D2D transmission allowed by the base station device 20 to the cellular transmission.
In this embodiment of the present invention, the terminal device 10 is further configured to, when the configuration information includes a D2D transmission power upper limit value, obtain the D2D transmission power upper limit value from the configuration information; or, when the configuration information includes a backoff value X of the D2D transmission power relative to the cellular transmission power, determining that the upper limit value of the D2D transmission power is PCELL(i) -X, said PCELL(i) The transmission power value of cellular transmission of the ith sub-frame is calculated according to a cellular transmission power control mechanism; or, the D2D transmission power upper limit value is determined by using the interference power upper limit value and the path loss from the terminal device 10 to the base station device 20.
In this embodiment of the present invention, the terminal device 10 is specifically configured to determine the D2D transmission power corresponding to the condition that the D2D transmission power is not limited by using the following formula:
PNC,D2D(i)＝B+PO_D2D+αD2D·PLD2D+ΔTF,D2D(i)+fD2D(i)；
wherein, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedO_D2DTarget received power for D2D transmission, αD2D0 is equal to or less than α as a compensation factorD2D≤1，PLD2DFor the path loss between the terminal 10 and the terminal in D2D transmission with the terminal 10, ΔTF,D2D(i) Power adjustment parameter, f, determined for the modulation order of the D2D transmission of the i-th subframeD2D(i) Transmitting closed-loop adjustment quantity of ith subframe controlled by closed-loop power control command for D2D, wherein B is 0 or B is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
In this embodiment of the present invention, the terminal device 10 is specifically configured to determine the interference margin by using the following formula:
IH(i)＝PLM,D2D(i)-PNC,D2D(i) (ii) a Or,
IH(i)＝min{PCMAX,D2D(i),PLM,D2D(i)}-PNC,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-PLM,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-min{PCMAX,D2D(i),PLM,D2D(i)}；
where IH (i) is the interference margin of the ith subframe, PLM,D2D(i) Upper limit value of D2D transmission power for ith sub-frame, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedCMAX,D2D(i) A maximum transmission power value for the terminal device 10 at the ith subframe for D2D transmission.
In this embodiment of the present invention, the base station device 20 is specifically configured to, when the interference margin is a negative value, increase an upper limit value of D2D transmission power transmitted by D2D corresponding to the terminal device 10, and/or reduce a target received power transmitted by D2D corresponding to the terminal device 10; when the interference margin is a positive value, increasing the target received power of the D2D transmission corresponding to the terminal device 10, and/or increasing the modulation and coding scheme MCS level of the D2D transmission corresponding to the terminal device 10; or,
when the interference margin is a positive value, increasing the upper limit value of the D2D transmission power of the D2D transmission corresponding to the terminal device 10, and/or decreasing the target reception power of the D2D transmission corresponding to the terminal device 10; when the interference margin is a negative value, the target received power of the D2D transmission corresponding to the terminal device 10 is increased, and/or the MCS level of the D2D transmission corresponding to the terminal device 10 is increased.
EXAMPLE III
Based on the same inventive concept as the above method, an embodiment of the present invention further provides a terminal device, as shown in fig. 6, where the terminal device includes:
a first determining module 11, configured to determine a device-to-device D2D transmission power upper limit value;
a second determining module 12, configured to determine a corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
a third determining module 13, configured to determine an interference margin by using the D2D transmission power upper limit value and a corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
a first sending module 14, configured to send the interference margin to a base station device, where the base station device adjusts a transmission power parameter of the D2D transmission by using the interference margin.
The first determining module 11 is specifically configured to receive configuration information from a base station device, and determine a D2D transmission power upper limit value by using the configuration information; or receiving an interference power upper limit value from the base station equipment, and determining a D2D transmission power upper limit value by using the interference power upper limit value; the interference power upper limit value is the maximum interference value generated by the D2D transmission allowed by the base station equipment to the cellular transmission.
The first determining module 11 is specifically configured to, when the configuration information includes a D2D transmission power upper limit value, obtain the D2D transmission power upper limit value from the configuration information; or,
the first determining module 11 is specifically configured to determine that the upper limit value of the D2D transmission power is P when the configuration information includes a backoff value X of the D2D transmission power relative to the cellular transmission powerCELL(i) -X; the P isCELL(i) Is the transmission power value of the cellular transmission of the ith sub-frame calculated according to the cellular transmission power control mechanism.
The first determining module 11 is specifically configured to determine the D2D transmission power upper limit value by using the interference power upper limit value and a path loss from the terminal device to the base station device.
The first determining module 11 is further configured to calculate the D2D transmission power upper limit value by using the following formula:
wherein, PLM,D2D(i) An upper limit value of the transmission power for D2D of the ith subframe,α is a compensation factor for the interference power upper limit value, 0 is equal to or less than α is equal to or less than 1, PL is the path loss from the terminal equipment to the base station equipment, and A is 0 or A is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
The second determining module 12 is specifically configured to determine the D2D transmission power corresponding to the unlimited D2D transmission power condition by using the following formula:
PNC,D2D(i)＝B+PO_D2D+αD2D·PLD2D+ΔTF,D2D(i)+fD2D(i)；
wherein, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedO_D2DTarget received power for D2D transmission, αD2D0 is equal to or less than α as a compensation factorD2D≤1，PLD2DFor the path loss between the terminal device and the terminal device carrying out the D2D transmission with the terminal device, DeltaTF,D2D(i) Power adjustment parameter determined for modulation order of D2D transmission of ith subframeNumber fD2D(i) Transmitting closed-loop adjustment quantity of ith subframe controlled by closed-loop power control command for D2D, wherein B is 0 or B is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
The third determining module 13 is specifically configured to determine the interference margin by using the following formula:
IH(i)＝PLM,D2D(i)-PNC,D2D(i) (ii) a Or,
IH(i)＝min{PCMAX,D2D(i),PLM,D2D(i)}-PNC,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-PLM,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-min{PCMAX,D2D(i),PLM,D2D(i)}；
where IH (i) is the interference margin of the ith subframe, PLM,D2D(i) Upper limit value of D2D transmission power for ith sub-frame, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedCMAX,D2D(i) And the maximum transmission power value used for D2D transmission in the ith subframe for the terminal equipment.
The first sending module 14 is specifically configured to perform quantization processing on the interference margin, and send the interference margin after the quantization processing to the base station device.
The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.
Example four
Based on the same inventive concept as the above method, an embodiment of the present invention further provides a base station apparatus, as shown in fig. 7, where the base station apparatus includes:
a receiving module 21, configured to receive an interference margin from a terminal device, where the interference margin is determined by using a device-to-device D2D transmission power upper limit and a corresponding D2D transmission power under a condition that a D2D transmission power is not limited by the terminal device;
and the processing module 22 is configured to adjust a transmission power parameter of D2D transmission corresponding to the terminal device by using the interference margin.
The processing module 22 is specifically configured to, when the interference margin is a negative value, increase an upper limit value of a D2D transmission power transmitted by D2D corresponding to the terminal device, and/or decrease a target received power of D2D transmission corresponding to the terminal device; when the interference allowance is a positive value, increasing the target receiving power of the D2D transmission corresponding to the terminal equipment, and/or increasing the Modulation Coding Scheme (MCS) level of the D2D transmission corresponding to the terminal equipment; or,
the processing module 22 is specifically configured to, when the interference margin is a positive value, increase an upper limit value of a D2D transmission power transmitted by D2D corresponding to the terminal device, and/or decrease a target received power transmitted by D2D corresponding to the terminal device; and when the interference margin is a negative value, increasing the target receiving power of the D2D transmission corresponding to the terminal equipment, and/or increasing the MCS level of the D2D transmission corresponding to the terminal equipment.
In this embodiment of the present invention, the base station device further includes:
a fourth determining module 23, configured to determine configuration information corresponding to the terminal device, where the configuration information includes a backoff value of D2D transmission power relative to cellular transmission power, which is X or an upper limit value of D2D transmission power; or determining an interference power upper limit value corresponding to the terminal device, where the interference power upper limit value is a maximum interference value generated by D2D transmission allowed by the base station device for cellular transmission;
a second sending module 24, configured to send, when determining configuration information corresponding to a terminal device, the configuration information corresponding to the terminal device, where the terminal device determines, by using the configuration information, an upper limit value of the transmission power of D2D; or when the interference power upper limit value corresponding to the terminal equipment is determined, the interference power upper limit value corresponding to the terminal equipment is sent to the terminal equipment, and the terminal equipment determines the D2D transmission power upper limit value by using the interference power upper limit value.
The fourth determining module 23 is specifically configured to determine an interference power upper limit value corresponding to the terminal device by using the uplink total interference power and/or the cellular transmission signal power.
The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims (28)

1. A method of power control for device-to-device D2D transmissions, comprising:
the terminal equipment determines the upper limit value of the D2D transmission power and determines the corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
the terminal equipment determines an interference margin by using the D2D transmission power upper limit value and the corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
and the terminal equipment sends the interference margin to base station equipment, and the base station equipment adjusts the transmission power parameter transmitted by the D2D by using the interference margin.
2. The method of claim 1, wherein the terminal device determining a D2D transmission power upper limit value comprises:
the terminal equipment receives configuration information from the base station equipment, and determines the upper limit value of the D2D transmission power by using the configuration information; or,
the terminal equipment receives an interference power upper limit value from the base station equipment, and determines the D2D transmission power upper limit value by using the interference power upper limit value; the interference power upper limit value is the maximum interference value generated by the D2D transmission allowed by the base station equipment to the cellular transmission.
3. The method of claim 2, wherein the terminal device determining the D2D transmission power upper limit value using the configuration information comprises:
when the configuration information comprises a D2D transmission power upper limit value, the terminal equipment obtains the D2D transmission power upper limit value from the configuration information; or,
when the configuration information comprises a back-off value X of D2D transmission power relative to cellular transmission power, the terminal device determines that the upper limit value of the D2D transmission power is PCELL(i) -X; the P isCELL(i) Is the transmission power value of the cellular transmission of the ith sub-frame calculated according to the cellular transmission power control mechanism.
4. The method of claim 2, wherein the terminal device determining the D2D transmit power cap value using the interference power cap value comprises:
and the terminal equipment determines the D2D transmission power upper limit value by using the interference power upper limit value and the path loss from the terminal equipment to the base station equipment.
5. The method of claim 4, wherein the terminal device determining the D2D transmission power upper limit value using the interference power upper limit value and the terminal device path loss to the base station device comprises:
the terminal device calculates the D2D transmission power upper limit value by using the following formula:
；
wherein, PLM,D2D(i) An upper limit value of the transmission power for D2D of the ith subframe,α is a compensation factor for the interference power upper limit value, 0 is equal to or less than α is equal to or less than 1, PL is the path loss from the terminal equipment to the base station equipment, and A is 0 or A is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
6. The method of claim 1, wherein the terminal device determining the corresponding D2D transmission power under the condition that the D2D transmission power is not limited comprises:
the terminal equipment determines the corresponding D2D transmission power under the condition that the D2D transmission power is not limited by the following formula:
PNC,D2D(i)＝B+PO_D2D+αD2D·PLD2D+ΔTF,D2D(i)+fD2D(i)；
wherein, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedO_D2DTarget received power for D2D transmission, αD2D0 is equal to or less than α as a compensation factorD2D≤1，PLD2DFor the path loss between the terminal device and the terminal device carrying out the D2D transmission with the terminal device, DeltaTF,D2D(i) Power adjustment parameter, f, determined for the modulation order of the D2D transmission of the i-th subframeD2D(i) For D2DThe closed-loop adjustment quantity of the ith subframe controlled by the closed-loop power control command is output, wherein B is 0 or B is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
7. The method of claim 1, or 5, or 6, wherein the terminal device determines the interference margin by using the D2D transmission power upper limit value and the corresponding D2D transmission power under the condition that the D2D transmission power is not limited, and the method comprises:
the terminal equipment determines the interference margin by using the following formula:
IH(i)＝PLM,D2D(i)-PNC,D2D(i) (ii) a Or,
IH(i)＝min{PCMAX,D2D(i),PLM,D2D(i)}-PNC,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-PLM,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-min{PCMAX,D2D(i),PLM,D2D(i)}；
where IH (i) is the interference margin of the ith subframe, PLM,D2D(i) Upper limit value of D2D transmission power for ith sub-frame, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedCMAX,D2D(i) And the maximum transmission power value used for D2D transmission in the ith subframe for the terminal equipment.
8. The method of claim 1, wherein the terminal device transmitting the interference margin to a base station device, comprises:
and the terminal equipment carries out quantization processing on the interference allowance and sends the interference allowance after the quantization processing to the base station equipment.
9. A method of power control for device-to-device D2D transmissions, comprising:
the method comprises the steps that base station equipment receives an interference margin from terminal equipment, wherein the interference margin is determined by the terminal equipment by using a D2D transmission power upper limit value and a corresponding D2D transmission power under the condition that D2D transmission power is not limited;
and the base station equipment adjusts the transmission power parameter of the D2D transmission corresponding to the terminal equipment by using the interference margin.
10. The method of claim 9, wherein the base station device utilizing the interference margin to adjust the transmission power parameter of the D2D transmission corresponding to the terminal device comprises:
when the interference margin is a negative value, the base station device increases the upper limit value of the D2D transmission power of the D2D transmission corresponding to the terminal device, and/or decreases the target reception power of the D2D transmission corresponding to the terminal device; when the interference margin is a positive value, the base station equipment increases the target receiving power of the D2D transmission corresponding to the terminal equipment, and/or the base station equipment increases the Modulation and Coding Scheme (MCS) level of the D2D transmission corresponding to the terminal equipment; or,
when the interference margin is a positive value, the base station device increases the upper limit value of the D2D transmission power of the D2D transmission corresponding to the terminal device, and/or decreases the target reception power of the D2D transmission corresponding to the terminal device; when the interference margin is a negative value, the base station device increases the target received power of the D2D transmission corresponding to the terminal device, and/or the base station device increases the modulation and coding scheme MCS level of the D2D transmission corresponding to the terminal device.
11. The method of claim 9 or 10, wherein the method further comprises:
the base station equipment determines configuration information corresponding to the terminal equipment, sends the configuration information corresponding to the terminal equipment, and the terminal equipment determines an upper limit value of D2D transmission power by using the configuration information; wherein, the configuration information includes that the back-off value of the D2D transmission power relative to the cellular transmission power is X or the upper limit value of the D2D transmission power; or,
the base station equipment determines an interference power upper limit value corresponding to the terminal equipment, sends the interference power upper limit value corresponding to the terminal equipment, and the terminal equipment determines a D2D transmission power upper limit value by using the interference power upper limit value; wherein the interference power upper limit value is a maximum interference value generated by the D2D transmission allowed by the base station equipment to the cellular transmission.
12. A power control system for device-to-device D2D transmissions, comprising:
the terminal device is configured to determine an upper limit value of D2D transmission power, determine a D2D transmission power corresponding to the D2D transmission power under the condition that the D2D transmission power is not limited, determine an interference margin by using the upper limit value of D2D transmission power and the D2D transmission power corresponding to the D2D transmission power under the condition that the D2D transmission power is not limited, and send the interference margin to the base station device;
and the base station equipment is used for receiving the interference margin from the terminal equipment and adjusting the transmission power parameter of the D2D transmission corresponding to the terminal equipment by using the interference margin.
13. The system of claim 12,
the terminal device is specifically configured to receive configuration information from a base station device, and determine the D2D transmission power upper limit value by using the configuration information; or receiving an interference power upper limit value from base station equipment, and determining the D2D transmission power upper limit value by using the interference power upper limit value; the interference power upper limit value is the maximum interference value generated by the D2D transmission allowed by the base station equipment to the cellular transmission.
14. The system of claim 13,
the terminal device is further configured to receive a D2D transmission power upper limit value from the terminal device when the configuration information includes the D2D transmission power upper limit valueObtaining the upper limit value of the D2D transmission power from configuration information; or, when the configuration information includes a backoff value X of the D2D transmission power relative to the cellular transmission power, determining that the upper limit value of the D2D transmission power is PCELL(i) -X, said PCELL(i) The transmission power value of cellular transmission of the ith sub-frame is calculated according to a cellular transmission power control mechanism; or, determining the D2D transmission power upper limit value by using the interference power upper limit value and the path loss from the terminal device to the base station device.
15. The system of claim 12,
the terminal device is specifically configured to determine the D2D transmission power corresponding to the unlimited D2D transmission power condition by using the following formula:
PNC,D2D(i)＝B+PO_D2D+αD2D·PLD2D+ΔTF,D2D(i)+fD2D(i)；
wherein, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedO_D2DTarget received power for D2D transmission, αD2D0 is equal to or less than α as a compensation factorD2D≤1，PLD2DFor the path loss between the terminal device and the terminal device carrying out the D2D transmission with the terminal device, DeltaTF,D2D(i) Power adjustment parameter, f, determined for the modulation order of the D2D transmission of the i-th subframeD2D(i) Transmitting closed-loop adjustment quantity of ith subframe controlled by closed-loop power control command for D2D, wherein B is 0 or B is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
16. The system of claim 12 or 15,
the terminal device is specifically configured to determine the interference margin by using the following formula:
IH(i)＝PLM,D2D(i)-PNC,D2D(i) (ii) a Or,
IH(i)＝min{PCMAX,D2D(i),PLM,D2D(i)}-PNC,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-PLM,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-min{PCMAX,D2D(i),PLM,D2D(i)}；
where IH (i) is the interference margin of the ith subframe, PLM,D2D(i) Upper limit value of D2D transmission power for ith sub-frame, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedCMAX,D2D(i) And the maximum transmission power value used for D2D transmission in the ith subframe for the terminal equipment.
17. The system of claim 12,
the base station device is specifically configured to, when the interference margin is a negative value, increase an upper limit value of a D2D transmission power transmitted by D2D corresponding to the terminal device, and/or decrease a target reception power of D2D transmission corresponding to the terminal device; when the interference allowance is a positive value, increasing the target receiving power of the D2D transmission corresponding to the terminal equipment, and/or increasing the Modulation Coding Scheme (MCS) level of the D2D transmission corresponding to the terminal equipment; or,
when the interference margin is a positive value, increasing the upper limit value of the D2D transmission power of the D2D transmission corresponding to the terminal equipment, and/or reducing the target receiving power of the D2D transmission corresponding to the terminal equipment; and when the interference margin is a negative value, increasing the target receiving power of the D2D transmission corresponding to the terminal equipment, and/or increasing the MCS level of the D2D transmission corresponding to the terminal equipment.
18. A terminal device, comprising:
a first determining module, configured to determine a device-to-device D2D transmission power upper limit value;
a second determining module, configured to determine a corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
a third determining module, configured to determine an interference margin by using the D2D transmission power upper limit value and a corresponding D2D transmission power under the condition that the D2D transmission power is not limited;
a first sending module, configured to send the interference margin to a base station device, where the base station device adjusts a transmission power parameter of D2D transmission by using the interference margin.
19. The terminal device of claim 18,
the first determining module is specifically configured to receive configuration information from a base station device, and determine a D2D transmission power upper limit value by using the configuration information; or receiving an interference power upper limit value from the base station equipment, and determining a D2D transmission power upper limit value by using the interference power upper limit value; the interference power upper limit value is the maximum interference value generated by the D2D transmission allowed by the base station equipment to the cellular transmission.
20. The terminal device of claim 19,
the first determining module is specifically configured to, when the configuration information includes a D2D transmission power upper limit value, obtain the D2D transmission power upper limit value from the configuration information; or,
the first determining module is specifically configured to determine that the upper limit value of the D2D transmission power is P when the configuration information includes a backoff value X of the D2D transmission power relative to the cellular transmission powerCELL(i) -X; the P isCELL(i) Is the transmission power value of the cellular transmission of the ith sub-frame calculated according to the cellular transmission power control mechanism.
21. The terminal device of claim 19,
the first determining module is specifically configured to determine the D2D transmission power upper limit value by using the interference power upper limit value and a path loss from the terminal device to the base station device.
22. The terminal device of claim 21,
the first determining module is further configured to calculate a D2D transmission power upper limit value by using the following formula:
wherein, PLM,D2D(i) An upper limit value of the transmission power for D2D of the ith subframe,α is a compensation factor for the interference power upper limit value, 0 is equal to or less than α is equal to or less than 1, PL is the path loss from the terminal equipment to the base station equipment, and A is 0 or A is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
23. The terminal device of claim 18,
the second determining module is specifically configured to determine the D2D transmission power corresponding to the unlimited D2D transmission power condition by using the following formula:
PNC,D2D(i)＝B+PO_D2D+αD2D·PLD2D+ΔTF,D2D(i)+fD2D(i)；
wherein, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedO _ D2D isTarget received power for D2D transmission, αD2D0 is equal to or less than α as a compensation factorD2D≤1，PLD2DFor the path loss between the terminal device and the terminal device carrying out the D2D transmission with the terminal device, DeltaTF,D2D(i) Power adjustment parameter, f, determined for the modulation order of the D2D transmission of the i-th subframeD2D(i) Transmitting closed-loop adjustment quantity of ith subframe controlled by closed-loop power control command for D2D, wherein B is 0 or B is 10log10(MD2D(i))，MD2D(i) Bandwidth of D2D transmission for the ith subframe.
24. The terminal device of claim 18, or 22, or 23,
the third determining module is specifically configured to determine the interference margin by using the following formula:
IH(i)＝PLM,D2D(i)-PNC,D2D(i) (ii) a Or,
IH(i)＝min{PCMAX,D2D(i),PLM,D2D(i)}-PNC,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-PLM,D2D(i) (ii) a Or,
IH(i)＝PNC,D2D(i)-min{PCMAX,D2D(i),PLM,D2D(i)}；
where IH (i) is the interference margin of the ith subframe, PLM,D2D(i) Upper limit value of D2D transmission power for ith sub-frame, PNC,D2D(i) Is the D2D transmission power, P, of the ith sub-frame corresponding to the condition that the D2D transmission power is not limitedCMAX,D2D(i) And the maximum transmission power value used for D2D transmission in the ith subframe for the terminal equipment.
25. The terminal device of claim 18,
the first sending module is specifically configured to perform quantization processing on the interference margin, and send the interference margin after the quantization processing to the base station device.
26. A base station apparatus, comprising:
a receiving module, configured to receive an interference margin from a terminal device, where the interference margin is determined by using a device-to-device D2D transmission power upper limit value and a corresponding D2D transmission power under a condition that a D2D transmission power is not limited by the terminal device;
and the processing module is configured to adjust a transmission power parameter of D2D transmission corresponding to the terminal device by using the interference margin.
27. The base station apparatus of claim 26,
the processing module is specifically configured to, when the interference margin is a negative value, increase an upper limit value of a D2D transmission power transmitted by D2D corresponding to the terminal device, and/or decrease a target reception power of D2D transmission corresponding to the terminal device; when the interference allowance is a positive value, increasing the target receiving power of the D2D transmission corresponding to the terminal equipment, and/or increasing the Modulation Coding Scheme (MCS) level of the D2D transmission corresponding to the terminal equipment; or,
the processing module is specifically configured to, when the interference margin is a positive value, increase an upper limit value of a D2D transmission power transmitted by D2D corresponding to the terminal device, and/or decrease a target reception power of D2D transmission corresponding to the terminal device; and when the interference margin is a negative value, increasing the target receiving power of the D2D transmission corresponding to the terminal equipment, and/or increasing the MCS level of the D2D transmission corresponding to the terminal equipment.
28. The base station apparatus of claim 26 or 27, further comprising:
a fourth determining module, configured to determine configuration information corresponding to the terminal device, where the configuration information includes a backoff value of D2D transmission power relative to cellular transmission power, which is X or an upper limit value of D2D transmission power; or determining an interference power upper limit value corresponding to the terminal device, where the interference power upper limit value is a maximum interference value generated by D2D transmission allowed by the base station device for cellular transmission;
a second sending module, configured to send configuration information corresponding to a terminal device to the terminal device when determining the configuration information corresponding to the terminal device, where the terminal device determines, by using the configuration information, an upper limit value of D2D transmission power; or when the interference power upper limit value corresponding to the terminal equipment is determined, the interference power upper limit value corresponding to the terminal equipment is sent to the terminal equipment, and the terminal equipment determines the D2D transmission power upper limit value by using the interference power upper limit value.
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