CN105323841A - D2D transmission power control method and apparatus - Google Patents

D2D transmission power control method and apparatus Download PDF

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Publication number
CN105323841A
CN105323841A CN201410378449.1A CN201410378449A CN105323841A CN 105323841 A CN105323841 A CN 105323841A CN 201410378449 A CN201410378449 A CN 201410378449A CN 105323841 A CN105323841 A CN 105323841A
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resource area
power
resource
terminal
contorl parameters
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CN201410378449.1A
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CN105323841B (en
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彭莹
高秋彬
陈文洪
赵锐
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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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Abstract

The embodiment of the invention provides a D2D transmission power control method and an apparatus. The method comprises the following steps that: a network device divides physical resource blocks in a transmission resource pool according to interference strength of D2D signals transmitted on the physical resource blocks in the transmission resource pool to cellular transmission signals, and obtains N resource regions, wherein N is greater than or equal to 1; the network device respectively configures a power control parameter for D2D transmission for each of the N resource regions; and the network device transmits the power control parameters configured for the N resource regions to a terminal. Through the method provided by the embodiment of the invention, signal quality and signal coverage of the D2D signals can be increased while interference on the cellular transmission signals is reduced.

Description

A kind of D2D transmission power control method and device
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of D2D transmission power control method and device.
Background technology
In traditional cellular telecommunication art, the business such as the voice-and-data of two terminals are carried out alternately through base station resident separately and core net, can pass through D2D (DevicetoDevice, device-to-device also become terminal direct connection) technology when the spacing of terminal is very near realize mutual.D2D refers to that contiguous terminal can carry out the mutual of the business such as voice-and-data by direct connected link in short range, does not need to carry out the mutual of the business such as voice-and-data by Centroid (i.e. base station).
At LTE (LongTermEvolution, Long Term Evolution) in network, D2D communication refers to that being operated in LTE authorizes in frequency range, the D2D controlled by LTE network communicates, do the advantage that can give full play to D2D communication on the one hand like this, on the other hand LTE network also can overcome some problems of traditional D2D communication to the control that D2D communicate, such as, disturb uncontrollable etc.
When D2D communication being incorporated in the mandate frequency range of LTE, D2D communication will share Radio Resource with cellular communication, and now D2D communication and the multiplexing identical resource of cellular communication will inevitably cause the interference of signal each other.As shown in Figure 1, D2D communication is by when sharing the ascending resource of honeycomb with cellular communication, D2D signal, to the interference of cellular transmission signal, can affect the quality of cellular communication, and the intensity of interference depends on the power that D2D transmits and the D2D transmitting terminal distance to base station.
Control D2D signal is to the interference of cellular transmission signal, and general employing reduces the method for through-put power when D2D signal sends.The through-put power of D2D signal is relevant with factors such as path loss compensating factor, transmission objectives received powers.Current base station can be the path loss compensating factor and/or transmission objectives received power that D2D terminal distribution one is lower, and the through-put power of D2D terminal subframe is remained in a lower scope, and this method can reduce interference.But the through-put power that D2D signal is lower can cause D2D signal transmission quality and transmission coverage to decline.
In sum, when the interference of control D2D signal to cellular transmission signal, the signal transmission quality that D2D can be caused to communicate and transmission coverage decline.
Summary of the invention
The embodiment of the present invention provides a kind of D2D transmission power control method and device, in order to solve in prior art when the interference of control D2D signal to cellular transmission signal, and the problem that the signal transmission quality that D2D can be caused to communicate and transmission coverage decline.
The embodiment of the present invention provides a kind of device-to-device D2D transmission power control method, comprising:
The network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided, obtain N number of resource area, N >=1, described transfer resource pond is the resource collection for D2D transmission;
The described network equipment each resource area be respectively in described N number of resource area is configured for the power contorl parameters of D2D transmission;
Power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment.
Preferably, described in obtain N number of resource area after, also comprise:
The described network equipment is described N number of resource area configuration preference level, and the priority for described N number of resource area configuration is sent to described terminal; Wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity.
Preferably, described transfer resource pond is the set that the described network equipment distributes to all Physical Resource Block that community is transmitted for D2D;
Power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment, comprising:
Power contorl parameters for described N number of resource area configuration, by system broadcasts signaling or dedicated signaling, is sent to the terminal in described community by the described network equipment.
Preferably, also comprise:
After the terminal that Physical Resource Block in described transfer resource pond is distributed in described community is carried out D2D transmission by the described network equipment, the resource area belonging to distributed Physical Resource Block determines corresponding power contorl parameters;
The described network equipment, according to the terminal in described community and the distance between the described network equipment and/or path loss, adjusts the power contorl parameters determined;
Power contorl parameters after adjustment is sent to the terminal in described community by the described network equipment.
Preferably, described transfer resource pond is the set that the described network equipment distributes to all Physical Resource Block that terminal is transmitted for D2D;
Power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment, comprising:
Power contorl parameters for described N number of resource area configuration is sent to described terminal by the described network equipment.
Preferably, the power contorl parameters for described N number of resource area configuration is sent to described terminal by dedicated signaling or broadcast signaling by the described network equipment.
Preferably, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
Preferably, when described power contorl parameters comprises closed power adjusted value, the power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment, comprising:
The described network equipment sends closed loop transmission power to described terminal and controls TPC command, and described TPC command comprises power contorl parameters corresponding to each resource area, and indicates one of in the following manner the resource area corresponding to power contorl parameters:
The Radio Network Temporary Identifier RNTI corresponding with resource area is carried in described TPC command;
The indication information of resource area is carried in DCI format in described TPC command;
The mark of resource area corresponding with described closed power adjusted value for the closed power adjusted value carried in described TPC command is carried out combined coding, and is transmitted by described TPC command.
The embodiment of the present invention provides a kind of device-to-device D2D transmission power control method, and the method comprises:
Terminal receives the power contorl parameters of N number of resource area, wherein, described N number of resource area be the network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided and obtains, N >=1, described transfer resource pond is the resource collection for D2D transmission;
Described terminal is when carrying out D2D communication, according to the power contorl parameters of described N number of resource area, determine through-put power when transmitting D2D signal in described N number of resource area, the summation of the through-put power that described terminal is determined in N number of resource area is not more than the maximum transmission power of described terminal.
Preferably, each resource area in described N number of resource area is provided with corresponding priority, wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity;
The described through-put power determined when transmitting D2D signal in described resource area, comprising:
Described terminal, according to the priority of described N number of resource area, distributes in described N number of resource area through-put power when transmitting D2D signal.
Preferably, the described power contorl parameters according to described N number of resource area, determine through-put power when transmitting D2D signal in described N number of resource area, comprising:
Described terminal estimates the path loss between the described network equipment to described terminal, or described terminal to described D2D signal receiving terminal between path loss, determine through-put power when transmitting D2D signal in described N number of resource area according to the power contorl parameters of described path loss and described N number of resource area.
Preferably, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
The embodiment of the present invention provides a kind of network equipment, comprising:
Division unit, for according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, the Physical Resource Block in described transfer resource pond is divided, obtains N number of resource area, N >=1;
Parameter configuration unit, is configured for the power contorl parameters of D2D transmission for each resource area be respectively in described N number of resource area;
Transmitting element, for sending to terminal by the power contorl parameters for described N number of resource area configuration.
Preferably, described parameter configuration unit also comprises after obtaining N number of resource area:
For described N number of resource area configuration preference level, and the priority for described N number of resource area configuration is sent to described terminal; Wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity.
Preferably, described transfer resource pond is the set that the described network equipment distributes to all Physical Resource Block that Serving cell is transmitted for D2D;
Described transmitting element is used for:
By system broadcasts signaling or dedicated signaling, the power contorl parameters for described N number of resource area configuration is sent to the terminal in described community.
Preferably, also comprise:
After the terminal that Physical Resource Block in described transfer resource pond is distributed in described community is carried out D2D transmission by described division unit, the resource area belonging to distributed Physical Resource Block determines corresponding power contorl parameters;
The described network equipment, according to the terminal in described community and the distance between the described network equipment and/or path loss, adjusts the power contorl parameters determined;
Power contorl parameters after adjustment is sent to the terminal in described community by the described network equipment.
Preferably, described transfer resource pond is the set that described division unit distributes to all Physical Resource Block that terminal is transmitted for D2D;
Described transmitting element is used for:
Power contorl parameters for described N number of resource area configuration is sent to described terminal.
Preferably, the power contorl parameters for described N number of resource area configuration is sent to described terminal by dedicated signaling or broadcast signaling by described transmitting element.
Preferably, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
Preferably, when described power contorl parameters comprises closed power adjusted value, described transmitting element is used for:
Send closed loop transmission power to described terminal and control TPC command, described TPC command comprises power contorl parameters corresponding to each resource area, and indicates one of in the following manner the resource area corresponding to power contorl parameters:
The Radio Network Temporary Identifier RNTI corresponding with resource area is carried in described TPC command;
The indication information of resource area is carried in DCI format in described TPC command;
The mark of resource area corresponding with described closed power adjusted value for the closed power adjusted value carried in described TPC command is carried out combined coding, and is transmitted by described TPC command.
The embodiment of the present invention provides a kind of terminal, comprising:
Receiving element, for receiving the power contorl parameters of N number of resource area, wherein, described N number of resource area be the network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided and obtains, N >=1;
Determining unit, for when carrying out D2D communication, according to the power contorl parameters of described N number of resource area, determine through-put power when transmitting D2D signal in described N number of resource area, the summation of the through-put power determined in N number of resource area is not more than the maximum transmission power of terminal.
Preferably, each resource area in described N number of resource area is provided with corresponding priority, wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity;
The described through-put power determined when transmitting D2D signal in described resource area, comprising:
Described terminal, according to the priority of described N number of resource area, distributes in described N number of resource area through-put power when transmitting D2D signal.
Preferably, described determining unit is used for:
Estimate the path loss between the described network equipment to described terminal, or described terminal to described D2D signal receiving terminal between path loss, determine through-put power when transmitting D2D signal in described N number of resource area according to the power contorl parameters of described path loss and described N number of resource area.
Preferably, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
In the embodiment of the present invention, the interference strength that the network equipment is different to cellular transmission signal according to the D2D signal that the Physical Resource Block in transfer resource pond transmits, this Physical Resource Block is divided at least one resource area, then transmission objectives received power and/or path loss compensating factor is configured respectively to each resource area divided.Owing to configuring different transmission objectives received powers and/or path loss compensating factor in each resource area, so in the resource area of different interference intensity, transmitted power during terminal transmission D2D signal is also different, at the less transmission objectives received power of the area configurations high to cellular transmission signal disturbing intensity and/or path loss compensating factor, interference can be reduced, at the larger transmission objectives received power of the area configurations low to cellular transmission signal disturbing intensity and/or path loss compensating factor, signal quality and the signal cover of D2D signal can be increased, also can not there is larger impact to cellular transmission signal simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that Radio Resource is shared in D2D communication and cellular communication;
A kind of D2D transmission power control method flow chart that Fig. 2 provides for the embodiment of the present invention;
A kind of D2D transmission power control method flow chart that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 provides a kind of network equipment for the embodiment of the present invention;
Fig. 5 provides a kind of terminal for the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
The literal translation of D2D technology is exactly device-to-device technology, also can be described as terminal direct connection technology.When carrying out D2D communication in the lte networks, D2D communication shares Radio Resource with cellular network communication, and the sharing mode of Radio Resource can be divided into two kinds: sharing of orthogonal manner and sharing of multiplex mode.Adopt orthogonal manner to carry out Radio Resource to share and refer to carry out quadrature divide in static or dynamic mode to Radio Resource on Radio Resource uses, cellular network communication communicate with D2D the mutually orthogonal Radio Resource of use; Adopt multiplex mode to carry out Radio Resource to share when referring to that D2D communicate, the mode specified with standard is carried out shared multiplexing to the cell resource used, and by the interference-limited between two kinds of communications within the limits prescribed.
D2D communication and the multiplexing identical Radio Resource of cellular network communication will inevitably cause interference each other, because preferentially guarantee is the quality of cellular network communication, when reducing interference, first will reduce the interference of D2D signal to cellular transmission signal.
Terminal, when carrying out D2D communication, needs in transfer resource pond, get the Physical Resource Block that can transmit D2D signal.The set that transfer resource pond is made up of Physical Resource Block.Transfer resource pond comprises transmission resource pool and receives resource pool, sends in resource pool the Physical Resource Block comprised for sending D2D signal, receives in resource pool the Physical Resource Block comprised for receiving D2D signal.Physical Resource Block in transfer resource pond generally obtains by with under type:
One, the transfer resource pond of cell-level.The network equipment be the cell allocation part Physical Resource Block of this network equipment as transfer resource pond, terminal in this community adopts the mode shared to use Physical Resource Block in this transfer resource pond;
Two, the transfer resource pond of user class.The network equipment is that a terminal distributes separately a part of Physical Resource Block as transfer resource pond, and this transfer resource pond is that this terminal exclusively enjoys.
In the embodiment of the present invention, the interference strength that the network equipment is different to cellular transmission signal according to the D2D signal that the Physical Resource Block in transfer resource pond transmits, this Physical Resource Block is divided at least one resource area, then transmission objectives received power and/or path loss compensating factor is configured respectively to each resource area divided.Owing to configuring different transmission objectives received powers and/or path loss compensating factor in each resource area, so in the resource area to cellular transmission signal different interference intensity, through-put power during terminal transmission D2D signal is also different.
Below in conjunction with Figure of description, the embodiment of the present invention is described in detail.
As shown in Figure 2, a kind of D2D transmission power control method flow chart that the embodiment of the present invention provides, the method comprises:
Step 201: the network equipment to the interference strength of cellular transmission signal according to the D2D signal that the Physical Resource Block in transfer resource pond transmits, divides the Physical Resource Block in described transfer resource pond, obtains N number of resource area, N >=1;
Step 202: the described network equipment each resource area be respectively in described N number of resource area is configured for the power contorl parameters of D2D transmission, and described power contorl parameters comprises path loss compensating factor and/or transmission objectives received power;
Step 203: the power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment.
In the embodiment of the present invention, the network equipment generally refers to base station, or has other equipment of base station all functions.
Above-mentioned flow process can be carried out usually at any time, and the scheduling of resource of cellular transmission is dynamic, and the configuration in D2D transfer resource pond may be semi-static, and therefore the general adjustment according to transfer resource pond divides resource area.
In step 201, first transfer resource pond can divide by the network equipment, and transfer resource pond is the resource collection for D2D communication, and the foundation of division is the interference strength of D2D signal when transmitting to cellular transmission signal.When transmitting in the Physical Resource Block that D2D signal is different in transfer resource pond, different to the interference strength of cellular transmission signal, therefore Physical Resource Block close for interference strength is needed to be divided into a resource area, such transfer resource pond will be divided into N number of resource area, and wherein N is more than or equal to 1.
In step 202., after the division of transfer resource pond is complete, to each resource area configuration identifier, can configure different power contorl parameters to each resource area, this power contorl parameters comprises path loss compensating factor and/or transmission objectives received power simultaneously.During more than one of the resource area divided, the configuration of power contorl parameters is distinguishing, and larger to cellular transmission signal disturbing intensity when transmitting D2D signal in resource area, the numerical value of the power contorl parameters of this resource area is less.
The network equipment adopts following two kinds of methods to divide transfer resource pond:
One, to cellular transmission signal disturbing intensity when the network equipment is first estimated to transmit D2D signal in resource area, using the result that estimates as the foundation dividing resource area.
After having transmitted D2D signal in resource area, the network equipment can according to when transmitting D2D signal in this resource area to cellular transmission signal disturbing intensity, transfer resource pond is repartitioned.
Two, to cellular transmission signal disturbing intensity when the network equipment is estimated to transmit D2D signal in resource area, only using the result that estimates as the foundation dividing resource area.
First resource region and Secondary resource region is comprised with N number of resource area, and the D2D signal transmitted on first resource region is to the interference strength of cellular transmission signal, being greater than the D2D signal transmitted on Secondary resource region is example to the interference strength of cellular transmission signal, so the network equipment is the numerical value of the first power contorl parameters that first resource area configurations is transmitted for D2D, be less than the numerical value of the second power contorl parameters transmitted for D2D for Secondary resource area configurations, namely, path loss compensating factor in first power contorl parameters is less than the path loss compensating factor in the second power contorl parameters, transmission objectives received power in first power contorl parameters is less than the transmission objectives received power in the second power contorl parameters.
Less by by the power contorl parameters numerical value configuration of the high resource area of the interference strength of cellular transmission signal during terminal transmission D2D signal, the through-put power of the D2D signal sent in this resource area is diminished, thus reduce the interference strength of the cellular transmission signal of the network equipment, larger simultaneously by the power contorl parameters numerical value configuration of the low resource area of the interference strength of cellular transmission signal during terminal transmission D2D signal, the through-put power of the D2D signal sent in this resource area is made to become large, thus improve the signal quality of D2D signal and the coverage of signal that send in this resource area.
In step 202., the network equipment is when being divided into N number of resource area by transfer resource pond, can divide according to the frequency domain information of Physical Resource Block, also can be divide according to the time-domain information of Physical Resource Block, can also divide according to the time-frequency domain information of Physical Resource Block.
Such as, when dividing according to the frequency domain information of Physical Resource Block, if the scope of frequency domain is { N1, N2}, then can divide three resource area F1={N1, N1+X}, F2={N1+X+1, N1+Y-1}, F3={N1+Y, N2}, each resource area has different frequency ranges.
In step 202., the network equipment is that the power contorl parameters that each resource area configures can comprise path loss compensating factor and/or transmission objectives received power.Wherein, described path loss compensating factor comprises the path loss compensating factor of each resource area, or using the path loss compensating factor for a resource area configuration as reference path fissipation factor, for the side-play amount of other N-1 the resource area configuration path loss balancing factors, like this, the path-loss factor of this resource area is calculated by the side-play amount of path loss compensating factor corresponding to resource area and this reference path loss balancing factor.In like manner, described transmission objectives received power comprises the transmission objectives received power of each resource area, or using the transmission objectives received power for a resource area configuration as reference transmission target received power, be the side-play amount of other N-1 resource area configuration transmission objectives received powers.
In step 203, after the transfer resource pond of cell-level divides by the network equipment, by system broadcast message, the power contorl parameters for each resource area configuration is sent to all terminals in this community.After the transfer resource pond of user class divides by the network equipment, by dedicated signaling, the power contorl parameters for each resource area configuration is sent to the terminal belonging to this transfer resource pond.
As previously mentioned, transfer resource pond can comprise the transfer resource pond of cell-level and the transfer resource pond of user class.
If in step 201, resource area division is carried out in the transfer resource pond of the network equipment to cell-level, then in step 202., the network equipment is the power contorl parameters of resource area allocating cell level, the power contorl parameters now configured is applicable to all terminals in the cell, has certain versatility.
Consider and may there are differences due to the wireless environment of each terminal, cause the power contorl parameters of configuration unsatisfactory, following optimization process has been carried out to this embodiment of the present invention:
The power contorl parameters of the network equipment corresponding to this Physical Resource Block, and the wireless environment residing for terminal, adjust the power contorl parameters of cell-level.Concrete, after terminal obtains by the mode that competition or the network equipment distribute the Physical Resource Block transmitted needed for D2D signal, resource area belonging to distributed Physical Resource Block determines corresponding power contorl parameters, then the network equipment is according to the distance between terminal and the network equipment and/or path loss, the power contorl parameters determined is adjusted, and the power contorl parameters after adjustment is sent to this terminal.Now control to control more accurate than power when using the power contorl parameters of cell-level to the power of this terminal when transmitting D2D signal.
If in step 201, resource area division is carried out in the transfer resource pond of the network equipment to user class, then in step 202., the network equipment is the power contorl parameters of resource area configure user level, the power contorl parameters now configured is radio environment configuration residing for this terminal, and therefore controlling the power of this terminal when transmitting D2D signal can be more accurate.
Preferably, after dividing resource area, the network equipment can also be N number of resource area configuration preference level, and the priority for N number of resource area configuration is sent to described terminal.Wherein, the priority that the priority configured for the resource area that interference strength is large configures lower than the resource area low for interference strength.Object for resource area configuration preference level is that resource area energy priority allocation in order to make priority high is to through-put power.
Terminal is according to the transmission objectives received power in the resource area of network equipments configuration and each resource area and/or path loss compensating factor computes transmit power, because the through-put power summation of terminal in each resource area can not exceed the maximum transmission power that this terminal can send, this just causes the D2D signal in the resource area had may not obtain the through-put power of needs when transmitting, therefore the network equipment can be resource area configuration preference level, priority is higher, then the D2D signal in this resource area preferentially obtains the through-put power of needs when transmitting.
Terminal, when transmitting D2D signal, first determines the priority of the resource area that this D2D Signal transmissions uses, the through-put power of the D2D signal of the resource area that first calculating priority level is high, in distributable through-put power, then distributes through-put power to this D2D signal.The resource area that now priority is higher, the D2D signal transmitted in this resource area more likely obtains required through-put power.Such as there are 3 resource area A, B, C, the through-put power summation of D2D signal in these 3 resource area can not more than 10dBm, their priority order is from high to low A, B, C, in A, through-put power needs 5dBm as calculated, in B, through-put power needs 4dBm as calculated, in C, through-put power needs 4dBm as calculated, D2D signal now in A and B can obtain required through-put power when sending, because the priority of C is minimum, finally remaining 1dBm distributes to C, but can not meet the demand of D2D signal when sending in C.
With an instantiation, above-mentioned flow process is described in detail below.
In step 201, the network equipment is the transfer resource pond of the user class of terminal distribution is PRB{N1, N2}, according to the difference of D2D signal to the interference strength of cellular transmission signal, can according to PRB (physicalresourceblock, Physical Resource Block) frequency domain PRB{N1, N2} are divided into three resource area: F1=PRB{N1, N1+X}, F2=PRB{N1+X+1, N1+Y-1}, F3=PRB{N1+Y, N2}.Wherein, in F3, D2D signal is the strongest in these three resource area to the interference strength of cellular transmission signal, in F1, D2D signal is to weak stronger than F2 than F3 of the interference strength of cellular transmission signal, and in F2, D2D signal is the most weak in these three resource area to the interference strength of cellular transmission signal.
The network equipment is each resource area configuration preference level.Stronger according to the interference strength of D2D signal to cellular transmission signal, the principle configuration that priority is lower, the priority order from high in the end of three resource area is F2, F1, F3.
In step 202., the network equipment, according to the disturbed condition of terminal in each frequency domain resource region when transmitting D2D signal to cellular transmission signal, is configured at least one item in transmission objectives received power and path loss compensating factor.
Such as, be resource area configuration transmission objectives received power set { P o_D2D_F1, P o_D2D_F2, P o_D2D_F3and path loss compensating factor set { α d2D_F1, α d2D_F2, α d2D_F3.P o_D2D_F1, P o_D2D_F2, P o_D2D_F3be respectively the target received power of F1, F2, F3, α d2D_F1, α d2D_F2, α d2D_F3be respectively the path loss compensating factor of F1, F2, F3.
Again such as, be resource area configuration transmission objectives received power set { P o_D2D_F1, P o_D2D_F2, P o_D2D_F3.P o_D2D_F1, P o_D2D_F2, P o_D2D_F3be respectively the target received power of F1, F2, F3.The network equipment is that F1, F2, F3 configure identical path loss compensating factor.
Again such as, be resource area configuration path loss balancing factor set { α d2D_F1, α d2D_F2, α d2D_F3.α d2D_F1, α d2D_F2, α d2D_F3be respectively the path loss compensating factor of F1, F2, F3.The network equipment is that F1, F2, F3 configure identical transmission objectives received power.
The network equipment also can configure a transmission objectives received power P o_D2Das fiducial value, then configure a transmission objectives received power deviant set { P o_D2D_off1, P o_D2D_off2, P o_D2D_off3.The transmission objectives received power of F1, F2, F3 can calculate according to this fiducial value and the set of transmission objectives received power deviant.
The network equipment also can configure a path loss compensating factor α d2Das fiducial value, then configure a path loss compensating factor and move value set { △ α d2D_F1, △ α d2D_F2, △ α d2D_F3.The path loss compensating factor of F1, F2, F3 can calculate according to this fiducial value and the set of path loss compensating factor deviant.
Terminal, when carrying out D2D communication, calculates the through-put power of D2D signal each subframe when transmitting according to the transmission objectives received power in the resource area of network equipments configuration and each resource area and/or path loss compensating factor.The through-put power summation of terminal in each resource area can not exceed the maximum transmission power that terminal can send.
In order to the D2D signal of the resource area enabling priority higher preferentially obtains required through-put power when transmitting, the priority that terminal is resource area configuration according to the network equipment calculates the through-put power in each resource area.Concrete, the sequencing of calculating is F2, F1, F3.Computing formula be below calculate D2D signal subframe i respectively in the through-put power of each resource area, wherein i is positive integer.
P D 2 D _ F 2 ( i ) = min 10 log 10 ( P Λ CMAX ( i ) - P Λ WAN ( i ) ) , 10 log 10 ( M F 2 ( i ) ) + P O _ D 2 D _ F 2 + α D 2 D _ F 2 · PL + Δ TF ( i ) + f ( i )
P D 2 D _ F 1 ( i ) = min 10 log 10 ( P Λ CMAX ( i ) - P Λ WAN ( i ) - P Λ D 2 D _ F 2 ( i ) ) , 10 log 10 ( M F 1 ( i ) ) + P O _ D 2 D _ F 1 + α D 2 D _ F 1 · PL + Δ TF ( i ) + f ( i )
P D 2 D _ F 3 ( i ) = min 10 log 10 ( P Λ CMAX ( i ) - P Λ WAN ( i ) - P Λ D 2 D _ F 1 ( i ) - P Λ D 2 D _ F 2 ( i ) ) , 10 log 10 ( M F 3 ( i ) ) + P O _ D 2 D _ F 3 + α D 2 D _ F 3 · PL + Δ TF ( i ) + f ( i )
refer to the maximum transmission power on the subframe i of the D2D signal of terminal; refer to terminal on subframe i with the through-put power of signal when communicating between the network equipment; M fxi () is the size of the Physical Resource Block of subframe i shared by resource area Fx transmitting data, represent, P with Physical Resource Block (PRB) number o_D2D_Fxrepresent transmission objectives power, α d2D_Fxrepresent path loss compensating factor, wherein x gets 1,2 or 3; PL is the downlink path loss that terminal is measured, and unit is dB; F (i) is the closed power adjusted value of the power control command control that the network equipment sends, △ tFi () is by modulation coding mode and data type (controlling or data message) determined power offset.
In above computing formula, in transmission objectives received power and path loss compensating factor, one is had at least to be that the network equipment is configured the disturbed condition of cellular transmission signal when transmitting D2D signal according to terminal.Also can by △ tF(i) and f (i) zero setting.
During f (i) not zero setting, the network equipment can use closed loop transmission power to control (TransmissionPowerControl, TPC) command set f (i), thus control further to adjust to the power of a certain resource area, make the situation that terminal can be dispatched according to network equipment resource, to the degree of cellular transmission signal disturbing, and channel quality during D2D communication and coverage carry out power adjustment, also can compensate because up-downgoing channel does not mate the Power control error caused simultaneously.The f (i) of all resource area can be set to an identical value by TPC command, also can be respectively each resource area according to the situation of each resource area and a f (i) is set.
It is more than one that the network equipment distributes to resource area shared by D2D transfer resource used when terminal carries out D2D communication, or when closed loop scheduling does not send with the signaling of scheduling D2D transfer resource, the network equipment needs the resource area indicated while sending TPC command in this TPC command corresponding to f (i) simultaneously.
In instruction TPC command, the mode in the frequency domain resource region that f (i) is corresponding specifically comprises with one of under type:
The Radio Network Temporary Identifier RNTI corresponding with resource area is carried in TPC command;
The indication information corresponding with resource area is comprised in DCI format;
The mark of resource area corresponding with described closed power adjusted value for the closed power adjusted value carried in described TPC command is carried out combined coding, and is transmitted by described TPC command.
Above method is applicable to the various transport-type of D2D.
Above method is also applicable to combine model split resource area out according to time domain or time-frequency domain to the Physical Resource Block in transfer resource pond.
As shown in Figure 3, a kind of D2D transmission power control method flow chart that the embodiment of the present invention provides, the method comprises:
Step 301: terminal receives the power contorl parameters of N number of resource area, wherein, described N number of resource area be the network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided and obtains, described power contorl parameters comprises path loss compensating factor and/or transmission objectives received power, N >=1;
Step 302: described terminal, when carrying out D2D communication, according to the power contorl parameters of described N number of resource area, determines through-put power when transmitting D2D signal in described N number of resource area.
The information of terminal after the transfer resource pond receiving network equipment transmission divides, comprise N number of resource area that transfer resource pond divides, and the power contorl parameters that each resource area is corresponding, power contorl parameters comprises path loss compensating factor and/or transmission objectives received power.The through-put power of subframe in these calculation of parameter D2D signals that terminal sends according to network side.
Preferably, terminal is when carrying out D2D communication, if the transfer resource pond of terminal is divided at least one resource area, in the through-put power process determining subframe in D2D signal, the priority computes transmit power that also can configure resource area according to the network equipment.The subframe that terminal first calculates D2D signal, in the through-put power of the high resource area of priority, then distributes through-put power to the subframe of this D2D signal in distributable through-put power.The resource area that now priority is higher, the D2D signal transmitted in this resource area more likely obtains required through-put power.
Preferably, terminal by the network equipment estimated to the path loss between described terminal, or terminal to D2D signal receiving terminal between path loss as one of the parameter of computes transmit power.
For said method flow process, the embodiment of the present invention also provides a kind of network equipment and terminal.Wherein, this network equipment can realize the flow process shown in Fig. 2, and this terminal can realize the flow process shown in Fig. 3.
As shown in Figure 4, the embodiment of the present invention provides a kind of network equipment, comprising:
Division unit 401, for according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, the Physical Resource Block in described transfer resource pond is divided, obtains N number of resource area, N >=1;
Parameter configuration unit 402, is configured for the power contorl parameters of D2D transmission for each resource area be respectively in described N number of resource area;
Transmitting element 403, for sending to terminal by the power contorl parameters for described N number of resource area configuration.
Preferably, described parameter configuration unit 402 for:
By being less than the path loss compensating factor in the power contorl parameters of the low resource area of cellular transmission signal disturbing intensity of the path loss compensating factor configuration in the power contorl parameters to the high resource area of cellular transmission signal disturbing intensity, and/or being less than the transmission objectives received power configuration in the power contorl parameters to the high resource area of cellular transmission signal disturbing intensity the transmission objectives received power in the power contorl parameters of the low resource area of cellular transmission signal disturbing intensity.
Preferably, described parameter configuration unit 402 also comprises after obtaining N number of resource area:
For described N number of resource area configuration preference level, and the priority for described N number of resource area configuration is sent to described terminal; Wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity.
Preferably, described transfer resource pond is the set that the described network equipment distributes to all Physical Resource Block that Serving cell is transmitted for D2D;
Described transmitting element 403 for:
By system broadcasts signaling or dedicated signaling, the power contorl parameters for described N number of resource area configuration is sent to the terminal in described community.
Preferably, also comprise:
After the terminal that Physical Resource Block in described transfer resource pond is distributed in described community is carried out D2D transmission by described division unit 401, the resource area belonging to distributed Physical Resource Block determines corresponding power contorl parameters;
The described network equipment, according to the terminal in described community and the distance between the described network equipment and/or path loss, adjusts the power contorl parameters determined;
Power contorl parameters after adjustment is sent to the terminal in described community by the described network equipment.
Preferably, described transfer resource pond is the set that described division unit 401 distributes to all Physical Resource Block that terminal is transmitted for D2D;
Described transmitting element 403 for:
Power contorl parameters for described N number of resource area configuration is sent to described terminal.
Preferably, the power contorl parameters for described N number of resource area configuration is sent to described terminal by dedicated signaling or broadcast signaling by described transmitting element 403.
Preferably, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
Preferably, when described power contorl parameters comprises closed power adjusted value, described transmitting element 403 for:
Send closed loop transmission power to described terminal and control TPC command, described TPC command comprises power contorl parameters corresponding to each resource area, and indicates one of in the following manner the resource area corresponding to power contorl parameters:
The Radio Network Temporary Identifier RNTI corresponding with resource area is carried in described TPC command;
The indication information of resource area is carried in DCI format in described TPC command;
The mark of resource area corresponding with described closed power adjusted value for the closed power adjusted value carried in described TPC command is carried out combined coding, and is transmitted by described TPC command.
As shown in Figure 5, the embodiment of the present invention provides a kind of terminal, comprising:
Receiving element 501, for receiving the power contorl parameters of N number of resource area, wherein, described N number of resource area be the network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided and obtains, N >=1;
Determining unit 502, for when carrying out D2D communication, according to the power contorl parameters of described N number of resource area, determine through-put power when transmitting D2D signal in described N number of resource area, the summation of the through-put power determined in N number of resource area is not more than the maximum transmission power of terminal.
Preferably, being less than the path loss compensating factor in the power contorl parameters of the low resource area of cellular transmission signal disturbing intensity to the path loss compensating factor configuration in the power contorl parameters of the high resource area of cellular transmission signal disturbing intensity in described N number of resource area, and/or being less than the transmission objectives received power configuration in the power contorl parameters to the high resource area of cellular transmission signal disturbing intensity the transmission objectives received power in the power contorl parameters of the low resource area of cellular transmission signal disturbing intensity.
Preferably, each resource area in described N number of resource area is provided with corresponding priority, wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity;
The described through-put power determined when transmitting D2D signal in described resource area, comprising:
Described terminal, according to the priority of described N number of resource area, distributes in described N number of resource area through-put power when transmitting D2D signal.
Preferably, described determining unit 502 for:
Estimate the path loss between the described network equipment to described terminal, or described terminal to described D2D signal receiving terminal between path loss, determine through-put power when transmitting D2D signal in described N number of resource area according to the power contorl parameters of described path loss and described N number of resource area.
Preferably, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
According to the method that the embodiment of the present invention provides, the interference strength that the network equipment is different to cellular transmission signal according to the D2D signal that the Physical Resource Block in transfer resource pond transmits, this Physical Resource Block is divided at least one resource area, then transmission objectives received power and/or path loss compensating factor is configured respectively to each resource area divided.Owing to configuring different transmission objectives received powers and/or path loss compensating factor in each resource area, so in the resource area of different interference intensity, transmitted power during terminal transmission D2D signal is also different, at the less transmission objectives received power of the area configurations high to cellular transmission signal disturbing intensity and/or path loss compensating factor, interference can be reduced, at the larger transmission objectives received power of the area configurations low to cellular transmission signal disturbing intensity and/or path loss compensating factor, signal quality and the signal cover of D2D signal can be increased, also can not there is larger impact to cellular transmission signal simultaneously.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (24)

1. a device-to-device D2D transmission power control method, is characterized in that, comprising:
The network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided, obtain N number of resource area, N >=1, described transfer resource pond is the resource collection for D2D transmission;
The described network equipment each resource area be respectively in described N number of resource area is configured for the power contorl parameters of D2D transmission;
Power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment.
2. the method for claim 1, is characterized in that, described in obtain N number of resource area after, also comprise:
The described network equipment is described N number of resource area configuration preference level, and the priority for described N number of resource area configuration is sent to described terminal; Wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity.
3. the method according to any one of claim 1 to 2, is characterized in that, described transfer resource pond is the set that the described network equipment distributes to all Physical Resource Block that community is transmitted for D2D;
Power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment, comprising:
Power contorl parameters for described N number of resource area configuration, by system broadcasts signaling or dedicated signaling, is sent to the terminal in described community by the described network equipment.
4. method as claimed in claim 3, is characterized in that, also comprise:
After the terminal that Physical Resource Block in described transfer resource pond is distributed in described community is carried out D2D transmission by the described network equipment, the resource area belonging to distributed Physical Resource Block determines corresponding power contorl parameters;
The described network equipment, according to the terminal in described community and the distance between the described network equipment and/or path loss, adjusts the power contorl parameters determined;
Power contorl parameters after adjustment is sent to the terminal in described community by the described network equipment.
5. the method according to any one of claim 1 to 2, is characterized in that, described transfer resource pond is the set that the described network equipment distributes to all Physical Resource Block that terminal is transmitted for D2D;
Power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment, comprising:
Power contorl parameters for described N number of resource area configuration is sent to described terminal by the described network equipment.
6. method as claimed in claim 5, is characterized in that, the power contorl parameters for described N number of resource area configuration is sent to described terminal by dedicated signaling or broadcast signaling by the described network equipment.
7. the method according to any one of claim 1 to 2, is characterized in that, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
8. method as claimed in claim 7, is characterized in that, when described power contorl parameters comprises closed power adjusted value, the power contorl parameters for described N number of resource area configuration is sent to terminal by the described network equipment, comprising:
The described network equipment sends closed loop transmission power to described terminal and controls TPC command, and described TPC command comprises power contorl parameters corresponding to each resource area, and indicates one of in the following manner the resource area corresponding to power contorl parameters:
The Radio Network Temporary Identifier RNTI corresponding with resource area is carried in described TPC command;
The indication information of resource area is carried in DCI format in described TPC command;
The mark of resource area corresponding with described closed power adjusted value for the closed power adjusted value carried in described TPC command is carried out combined coding, and is transmitted by described TPC command.
9. a device-to-device D2D transmission power control method, is characterized in that, the method comprises:
Terminal receives the power contorl parameters of N number of resource area, wherein, described N number of resource area be the network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided and obtains, N >=1, described transfer resource pond is the resource collection for D2D transmission;
Described terminal is when carrying out D2D communication, according to the power contorl parameters of described N number of resource area, determine through-put power when transmitting D2D signal in described N number of resource area, the summation of the through-put power that described terminal is determined in N number of resource area is not more than the maximum transmission power of described terminal.
10. method as claimed in claim 9, it is characterized in that, each resource area in described N number of resource area is provided with corresponding priority, wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity;
The described through-put power determined when transmitting D2D signal in described resource area, comprising:
Described terminal, according to the priority of described N number of resource area, distributes in described N number of resource area through-put power when transmitting D2D signal.
11. methods as described in claim 9 or 10, is characterized in that the described power contorl parameters according to described N number of resource area is determined through-put power when transmitting D2D signal in described N number of resource area, being comprised:
Described terminal estimates the path loss between the described network equipment to described terminal, or described terminal to described D2D signal receiving terminal between path loss, determine through-put power when transmitting D2D signal in described N number of resource area according to the power contorl parameters of described path loss and described N number of resource area.
12. methods as described in claim 9 or 10, it is characterized in that, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
13. 1 kinds of network equipments, is characterized in that, comprising:
Division unit, for according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, the Physical Resource Block in described transfer resource pond is divided, obtains N number of resource area, N >=1;
Parameter configuration unit, is configured for the power contorl parameters of D2D transmission for each resource area be respectively in described N number of resource area;
Transmitting element, for sending to terminal by the power contorl parameters for described N number of resource area configuration.
14. network equipments as claimed in claim 13, it is characterized in that, described parameter configuration unit also comprises after obtaining N number of resource area:
For described N number of resource area configuration preference level, and the priority for described N number of resource area configuration is sent to described terminal; Wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity.
15. network equipments according to any one of claim 13 to 14, it is characterized in that, described transfer resource pond is the set that the described network equipment distributes to all Physical Resource Block that Serving cell is transmitted for D2D;
Described transmitting element is used for:
By system broadcasts signaling or dedicated signaling, the power contorl parameters for described N number of resource area configuration is sent to the terminal in described community.
16. network equipments as claimed in claim 15, is characterized in that, also comprise:
After the terminal that Physical Resource Block in described transfer resource pond is distributed in described community is carried out D2D transmission by described division unit, the resource area belonging to distributed Physical Resource Block determines corresponding power contorl parameters;
The described network equipment, according to the terminal in described community and the distance between the described network equipment and/or path loss, adjusts the power contorl parameters determined;
Power contorl parameters after adjustment is sent to the terminal in described community by the described network equipment.
17. network equipments according to any one of claim 13 to 14, it is characterized in that, described transfer resource pond is the set that described division unit distributes to all Physical Resource Block that terminal is transmitted for D2D;
Described transmitting element is used for:
Power contorl parameters for described N number of resource area configuration is sent to described terminal.
18. network equipments as claimed in claim 17, is characterized in that, the power contorl parameters for described N number of resource area configuration is sent to described terminal by dedicated signaling or broadcast signaling by described transmitting element.
19. network equipments according to any one of claim 13 to 14, it is characterized in that, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
20. network equipments as claimed in claim 19, it is characterized in that, when described power contorl parameters comprises closed power adjusted value, described transmitting element is used for:
Send closed loop transmission power to described terminal and control TPC command, described TPC command comprises power contorl parameters corresponding to each resource area, and indicates one of in the following manner the resource area corresponding to power contorl parameters:
The Radio Network Temporary Identifier RNTI corresponding with resource area is carried in described TPC command;
The indication information of resource area is carried in DCI format in described TPC command;
The mark of resource area corresponding with described closed power adjusted value for the closed power adjusted value carried in described TPC command is carried out combined coding, and is transmitted by described TPC command.
21. 1 kinds of terminals, is characterized in that, comprising:
Receiving element, for receiving the power contorl parameters of N number of resource area, wherein, described N number of resource area be the network equipment according to the D2D signal that the Physical Resource Block in transfer resource pond transmits to the interference strength of cellular transmission signal, Physical Resource Block in described transfer resource pond is divided and obtains, N >=1;
Determining unit, for when carrying out D2D communication, according to the power contorl parameters of described N number of resource area, determine through-put power when transmitting D2D signal in described N number of resource area, the summation of the through-put power determined in N number of resource area is not more than the maximum transmission power of terminal.
22. terminals as claimed in claim 21, it is characterized in that, each resource area in described N number of resource area is provided with corresponding priority, wherein, the priority that the priority that large to cellular transmission signal disturbing intensity resource area configures configures lower than the resource area low to cellular transmission signal disturbing intensity;
The described through-put power determined when transmitting D2D signal in described resource area, comprising:
Described terminal, according to the priority of described N number of resource area, distributes in described N number of resource area through-put power when transmitting D2D signal.
23. terminals as described in claim 21 or 22, it is characterized in that, described determining unit is used for:
Estimate the path loss between the described network equipment to described terminal, or described terminal to described D2D signal receiving terminal between path loss, determine through-put power when transmitting D2D signal in described N number of resource area according to the power contorl parameters of described path loss and described N number of resource area.
24. terminals as described in claim 21 or 22, it is characterized in that, described power contorl parameters comprises: the one in path loss compensating factor, transmission objectives received power, closed power adjusted value or combination in any.
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