CN104244449A - Device-to-device communication method and user equipment - Google Patents

Abstract

The embodiment of the invention discloses a device-to-device (D2D) communication method and UE. The D2D communication method comprises the steps that the first UE generates reference signals for communication with the second UE; the first UE sends transmission parameters of the reference signals to the second UE; the first UE sends the reference signals to the second UE according to the transmission parameters, so that after the second UE receives the reference signals according to the transmission parameters, the reference signals are measured, and communication selection is conducted according to the measurement result. By means of the D2D communication method and the UE, the UE of the two communication parties does not need to be in constant transmitting and receiving states, interaction can be achieved by sending the reference signals when D2D communication is needed between the UE, and thus the power of the two UE parties in the D2D communication is saved, and thus the D2D communication performance is improved.

Description

The communication means of device-to-device and subscriber equipment

Technical field

The present invention relates to communication technical field, particularly the communication means of device-to-device (Device to Device, D2D) and subscriber equipment (User Equipment, UE).

Background technology

Wireless communication technology obtains huge development in recent years, and existing conventional cordless communication network comprises cellular network.In cellular networks, when transmitting packet between the UE that two transmission ranges are far away, this packets need is transferred to base station from the UE that makes a start, then from base-station transmission to receiving end UE, above-mentioned transmitting procedure needs to take twice interface-free resources.When transmission range is nearer between two UE, in order to save air interface transmission resource, reducing the expense of base station control signal, can be communicated by D2D mode, direct communication between UE and receiving end UE of namely making a start, and forwarding without the need to base station.In prior art, D2D communication mode can be specially Wireless Fidelity (Wireless Fidelity, WiFi) etc.

Inventor finds in the research process of prior art, when adopting existing D2D communication mode to realize the communication between two UE, the UE that needs to make a start continues to transmit, to find receiving end UE, accordingly, receiving end UE also needs continuous reception signal, so that the communication connection keeping and make a start between UE.It can thus be appreciated that existing D2D communication mode, in order to keep the communication connection between two UE, needs two UE to continue to be in transmitting and receiving state, therefore wastes the power of UE, reduce D2D communication performance.

Summary of the invention

Communication means and the UE of D2D is provided in the embodiment of the present invention, to solve D2D communication mode waste UE power in prior art, and the problem that communication performance is not high.

In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:

First aspect, provides the communication means of a kind of D2D, and described method comprises:

First user equipment UE generates the reference signal communicated with the 2nd UE;

A described UE sends the transformation parameter of described reference signal to described 2nd UE;

A described UE sends described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal, measures described reference signal to make described 2nd UE according to described transformation parameter, and carries out communication selection according to measurement result.

In conjunction with first aspect, in the first possible implementation of first aspect, a described UE generates the reference signal communicated with the 2nd UE, comprising:

A described UE selects the starting resource block of transmission of reference signals sequence number, comb number, sends bandwidth, cyclic shift value and root sequence number;

Determine with described comb number the initial subcarrier transmitting described reference signal sequence according to described starting resource block number;

By the length of reference signal sequence described in described transmission bandwidth calculation;

According to length and the described sequence number selection Zadoff-Chu root sequence of described reference signal sequence;

Described reference signal sequence is calculated according to described Zadoff-Chu root sequence and described cyclic shift value.

In conjunction with first aspect, or the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, the transformation parameter that a described UE sends described reference signal to described 2nd UE comprises:

A described UE sends the transformation parameter of described reference signal to described 2nd UE by beep-page message; Or,

A described UE is by device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE; Wherein, also comprise in described device discovery signal or beep-page message: a described UE has the ability information of cooperative communication ability.

In conjunction with the first possible implementation of first aspect, or the implementation that the second of first aspect is possible, in the third possible implementation of first aspect, described transformation parameter comprises: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence;

A described UE sends described reference signal according to described transformation parameter to described 2nd UE and comprises: a described UE is according to the length of described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

Second aspect, provide the communication means of a kind of device-to-device D2D, described method comprises:

Second user equipment (UE) receives the transformation parameter of the reference signal that a UE sends;

Described 2nd UE receives the described reference signal of a described UE transmission according to described transformation parameter;

Described 2nd UE measures the described reference signal received, and obtains measurement result;

Described 2nd UE carries out communication according to described measurement result and selects.

In conjunction with second aspect, in the first possible implementation of second aspect, the transformation parameter that described 2nd UE receives the reference signal that a UE sends comprises: described 2nd UE receives the transformation parameter of the described reference signal that a UE is sent by beep-page message;

Described 2nd UE carries out communication selection according to described measurement result and comprises: described 2nd UE, according to the channel quality in described measurement result, selects and the communication resource carrying out between a described UE communicating.

In conjunction with second aspect, in the third possible implementation of first aspect, the transformation parameter that described 2nd UE receives the reference signal that a UE sends comprises: described 2nd UE receives a UE by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission; Also comprise in described device discovery signal or beep-page message: a described UE has the ability information of cooperative communication ability;

Described 2nd UE carries out communication selection according to described measurement result and comprises: when the channel quality in described measurement result exceedes default quality threshold, described 2nd UE selects a described UE to cooperate communication.

In conjunction with the first possible implementation of second aspect, or the implementation that the second of second aspect is possible, in the third possible implementation of second aspect, described transformation parameter comprises: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

The reference signal that described 2nd UE receives a described UE transmission according to described transformation parameter comprises:

Described 2nd UE determines according to described starting resource block number and comb number the initial subcarrier transmitting described reference signal sequence, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number;

Described 2nd UE, according to the length of described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receives the reference signal sequence that a described UE sends.

The third aspect, provides a kind of user equipment (UE), and described UE carries out as with the 2nd UE the UE that device-to-device D2D communicates, and comprising:

Generation unit, for generating the reference signal communicated with described 2nd UE;

Transmitting element, for sending the transformation parameter of the described reference signal that described generation unit generates to described 2nd UE, and send described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal to make described 2nd UE according to described transformation parameter, described reference signal is measured, and carries out communication selection according to measurement result.

In conjunction with the third aspect, in the first possible implementation of the third aspect, described generation unit comprises:

Chooser unit, for selecting the starting resource block number of transmission of reference signals sequence, comb number, sending bandwidth, cyclic shift value and root sequence number;

Determine subelement, determine with comb number the initial subcarrier transmitting described reference signal sequence for the starting resource block number according to described chooser Unit selection;

Computation subunit, for by the described length determining reference signal sequence described in the transmission bandwidth calculation that subelement is determined;

Described chooser unit, also for the length of reference signal sequence that calculates according to described computation subunit with describedly select Zadoff-Chu root sequence and cyclic shift value with sequence number;

Described computation subunit, also for calculating described reference signal sequence according to the Zadoff-Chu root sequence of described chooser Unit selection and cyclic shift value.

In conjunction with the third aspect, or the first possible implementation of the third aspect, in the implementation that the second of the third aspect is possible, described transmitting element comprises at least one following subelement:

First sends subelement, for being sent the transformation parameter of described reference signal to described 2nd UE by beep-page message;

Second sends subelement, and for passing through device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE; Wherein, also comprise in described device discovery signal or beep-page message: a described UE has the ability information of cooperative communication ability.

In conjunction with the first possible implementation of the third aspect, or the implementation that the second of the third aspect is possible, in the third possible implementation of the third aspect, the transformation parameter of the reference signal that described transmitting element sends comprises: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence;

Described transmitting element, specifically for the length according to described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

Fourth aspect, provides a kind of user equipment (UE), and described UE carries out as with a UE the 2nd UE that device-to-device D2D communicates, and comprising:

Receiving element, for receiving the transformation parameter of the reference signal that a UE sends, and receives the described reference signal of a described UE transmission according to described transformation parameter;

Measuring unit, measures for the described reference signal received described receiving element, obtains measurement result;

Selected cell, selects for carrying out communication according to the measurement result of described measuring unit.

In conjunction with fourth aspect, in the first possible implementation of fourth aspect, described receiving element, specifically for receiving the transformation parameter of the described reference signal that a UE is sent by beep-page message;

Described selected cell, specifically for the channel quality in the described measurement result that obtains according to described measuring unit, selects and the communication resource carrying out between a described UE communicating.

In conjunction with fourth aspect, in the third possible implementation of fourth aspect, described receiving element, specifically for receiving a UE by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission; The ability information that a described UE has cooperative communication ability is also comprised in described device discovery signal or beep-page message;

Described selected cell, specifically for when the channel quality in the described measurement result that described measuring unit obtains exceedes default quality threshold, selects a described UE to cooperate communication.

In conjunction with the first possible implementation of fourth aspect, or the implementation that the second of fourth aspect is possible, in the third possible implementation of fourth aspect, the transformation parameter that described receiving element receives comprises: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

Described receiving element comprises:

Computation subunit, for determining according to described starting resource block number and comb number the initial subcarrier transmitting described reference signal sequence, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number;

Receive subelement, for the length according to described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receive the reference signal sequence that a described UE sends.

5th aspect, provides a kind of user equipment (UE), and described UE carries out as with the 2nd UE the UE that device-to-device D2D communicates, and comprising: radio receiving-transmitting unit and processor, wherein,

Described processor, for generating the reference signal communicated with described 2nd UE, and sent the transformation parameter of described reference signal to described 2nd UE by described radio receiving-transmitting unit, and send described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal to make described 2nd UE according to described transformation parameter, described reference signal is measured, and carries out communication selection according to measurement result.

In conjunction with the 5th aspect, in the first possible implementation in the 5th, described processor, specifically for selecting the starting resource block number of transmission of reference signals sequence, comb number, send bandwidth, cyclic shift value and root sequence number, determine with described comb number the initial subcarrier transmitting described reference signal sequence according to described starting resource block number, by the length of reference signal sequence described in described transmission bandwidth calculation, according to length and the described sequence number selection Zadoff-Chu root sequence of described reference signal sequence, and calculate described reference signal sequence according to described Zadoff-Chu root sequence and described cyclic shift value.

In conjunction with the 5th aspect, or the 5th the first possible implementation of aspect, in the implementation that the second in the 5th is possible, described processor, specifically for by described radio receiving-transmitting unit, beep-page message is adopted to send the transformation parameter of described reference signal to described 2nd UE; Or, by described radio receiving-transmitting unit, adopt device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE, also comprises the ability information that a described UE has cooperative communication ability in described device discovery signal or beep-page message.

In conjunction with the first possible implementation of the 5th aspect, or the possible implementation of the 5th the second of aspect, in the third possible implementation in the 5th, the transformation parameter that described processor is sent by described radio receiving-transmitting unit comprises: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence;

Described processor, specifically for the length according to described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

6th aspect, provides a kind of user equipment (UE), and described UE carries out as with a UE the 2nd UE that device-to-device D2D communicates, and comprising:

Radio receiving-transmitting unit and processor, wherein,

Described radio receiving-transmitting unit, for receiving the transformation parameter of the reference signal that a UE sends, and receives the described reference signal of a described UE transmission according to described transformation parameter;

Described processor, measures for the described reference signal received described radio receiving-transmitting unit, obtains measurement result, and carries out communication selection according to described measurement result.

In conjunction with the 6th aspect, in the first the possible implementation in the 6th, described radio receiving-transmitting unit, specifically for receiving the transformation parameter of the described reference signal that a UE is sent by beep-page message;

Described processor, specifically for according to the channel quality in described measurement result, selects and the communication resource carrying out between a described UE communicating.

In conjunction with the 6th aspect, in the third possible implementation in the 6th, described radio receiving-transmitting unit, concrete reception the one UE is by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission, also comprises the ability information that a described UE has cooperative communication ability in described device discovery signal or beep-page message;

Described processor, specifically for when the channel quality in described measurement result exceedes default quality threshold, selects a described UE to cooperate communication.

In conjunction with the first possible implementation of the 6th aspect, or the possible implementation of the 6th the second of aspect, in the third possible implementation in the 6th, the transformation parameter that described radio receiving-transmitting unit receives comprises: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

Described processor, also for determining according to described starting resource block number and comb number the initial subcarrier transmitting described reference signal sequence, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number;

Described radio receiving-transmitting unit, specifically for the length according to described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receive the reference signal sequence that a described UE sends.

In the embodiment of the present invention, one UE generates the reference signal communicated with the 2nd UE, the transformation parameter of reference signal is sent to the 2nd UE, and send reference signal according to this transformation parameter to the 2nd UE, after 2nd UE receives reference signal according to this transformation parameter, reference signal is measured, and carries out communication selection according to measurement result.The D2D communication mode of the application embodiment of the present invention, both sides UE without the need to communication continues to be in transmitting and receiving state, but when can D2D be needed between UE to communicate, realizes mutual by sending reference signal, therefore save the power of the UE both sides of D2D communication, which thereby enhance D2D communication performance.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Figure 1A is an embodiment flow chart of the communication means of D2D of the present invention;

Figure 1B is another embodiment flow chart of the communication means of D2D of the present invention;

Fig. 2 A is another embodiment flow chart of the communication means of D2D of the present invention;

Fig. 2 B is the running time-frequency resource schematic diagram of reference signal in the embodiment of the present invention;

Fig. 3 is another embodiment flow chart of the communication means of D2D of the present invention;

Fig. 4 is an embodiment block diagram of UE of the present invention;

Fig. 5 is another embodiment block diagram of UE of the present invention;

Fig. 6 is another embodiment block diagram of UE of the present invention;

Fig. 7 is another embodiment block diagram of UE of the present invention.

Embodiment

The following embodiment of the present invention provides communication means and the UE of D2D.Wherein, as D2D communication both sides, can using a UE as communication the UE that makes a start, using the 2nd UE as communication receiving end UE.

Technical scheme in the embodiment of the present invention is understood better in order to make those skilled in the art person, and enable the above-mentioned purpose of the embodiment of the present invention, feature and advantage become apparent more, below in conjunction with accompanying drawing, technical scheme in the embodiment of the present invention is described in further detail.

See Figure 1A, be an embodiment flow chart of the communication means of D2D of the present invention, this embodiment describes D2D communication process from a UE side:

Step 101 a: UE generates the reference signal communicated with the 2nd UE.

Wherein, one UE selects the starting resource block of transmission of reference signals sequence number, comb number, sends bandwidth, cyclic shift value and root sequence number, the initial subcarrier of transmission of reference signals sequence is determined according to starting resource block number and comb number, by sending the length of bandwidth computing reference burst, according to length and the root sequence number selection Zadoff-Chu root sequence of reference signal sequence, according to Zadoff-Chu root sequence and cyclic shift value computing reference burst.

Step 102 a: UE sends the transformation parameter of reference signal to the 2nd UE.

Optionally, when selecting the D2D communication resource between a UE and the 2nd UE, a UE can send the transformation parameter of reference signal to the 2nd UE by beep-page message;

Optionally, when 2nd UE selects the cooperation UE of D2D cooperative communication, one UE can pass through device discovery signal, or beep-page message sends the transformation parameter of reference signal to the 2nd UE, further, the ability information that a UE has cooperative communication ability can also be comprised in this device discovery signal or beep-page message.

Step 103 a: UE sends reference signal according to transformation parameter to the 2nd UE, after receiving reference signal, measures reference signal to make the 2nd UE according to this transformation parameter, and carry out communication selection according to measurement result.

Transformation parameter in the present embodiment can comprise: the starting resource block of reference signal sequence number, comb number, send OFDM (Orthogonal Frequency Division Multiplexing, the OFDM) symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence.One UE can according to the length of initial subcarrier and reference signal sequence, after on Reference Signal sequence is mapped to last OFDM symbol of time-domain resource corresponding subcarrier according to comb interval, be transferred to the 2nd UE, this comb interval can be the quantity of comb number, such as, if comb number is 0,1,2, then comb is spaced apart 3.

As seen from the above-described embodiment, this embodiment continues to be in transmitting and receiving state without the need to the both sides UE of communication, but when can D2D be needed between UE to communicate, realizes mutual by sending reference signal, therefore save the power of the UE both sides of D2D communication, which thereby enhance D2D communication performance.

See Figure 1B, be another embodiment flow chart of the communication means of D2D of the present invention, this embodiment describes D2D communication process from the 2nd UE side:

Step 111: the 2nd UE receives the transformation parameter of the reference signal that a UE sends.

Optionally, when selecting the D2D communication resource between a UE and the 2nd UE, the 2nd UE can receive the transformation parameter of the reference signal that a UE is sent by beep-page message; When the 2nd UE selects the UE of D2D cooperative communication, 2nd UE can receive a UE by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission, can also comprise the ability information that a UE has cooperative communication ability in this device discovery signal or beep-page message.

In the present embodiment, transformation parameter can comprise: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence.

Step 112: the 2nd UE receives the reference signal of a UE transmission according to this transformation parameter.

Concrete, 2nd UE can determine the initial subcarrier of transmission of reference signals sequence according to starting resource block number and comb number, by sending the length of bandwidth computing reference burst, according to the quantity determination comb interval of comb number, then according to the length of initial subcarrier and reference signal sequence, on the corresponding subcarrier of the OFDM symbol of the time-domain resource mapped according to comb interval, receive the reference signal sequence that a UE sends.

Step 113: the 2nd UE measures the reference signal received, obtains measurement result.

Step 114: the 2nd UE carries out communication according to measurement result and selects.

Optionally, when selecting the D2D communication resource between a UE and the 2nd UE, the 2nd UE according to the channel quality in measurement result, can select and the communication resource carrying out between a UE communicating; When the 2nd UE selects the UE of D2D cooperative communication, if when the channel quality in measurement result exceedes default quality threshold, then the 2nd UE can select a UE to cooperate communication.

As seen from the above-described embodiment, this embodiment continues to be in transmitting and receiving state without the need to the both sides UE of communication, but when can D2D be needed between UE to communicate, realizes mutual by sending reference signal, therefore save the power of the UE both sides of D2D communication, which thereby enhance D2D communication performance.

See Fig. 2 A, be another embodiment flow chart of the communication means of D2D of the present invention, this embodiment is by describing the process selecting the D2D communication resource alternately between a UE and the 2nd UE:

Step 201 a: UE generates the reference signal communicated with the 2nd UE.

See Fig. 2 B, the running time-frequency resource schematic diagram for reference signal in the embodiment of the present invention:

In Fig. 2 B, the transmission bandwidth of hypothetical reference signal is two Resource Block (Resource Block, RB), and each RB is made up of 12 sub-carrier waves in frequency domain resource, and time-domain resource is made up of a 1ms subframe, and each subframe comprises 14 OFDM symbol.In the present embodiment, last OFDM symbol of each subframe is for sending reference signal, and each RB can transmit the reference signal of UE1, UE2, UE3 totally three UE simultaneously, as in Fig. 2 B, from first subcarrier of each RB, sequential loop is the subcarrier of UE1, UE2, UE3, and namely each UE can with three comb interval transmission reference signals on each RB, and each UE has four subcarriers on each RB.

In the present embodiment, suppose that a UE and the 2nd UE prepare to carry out D2D and communicate, need to determine messaging parameter, or carrying out needing to redefine channel parameter between a UE of D2D communication and the 2nd UE, then need to re-start channel detection between a UE and the 2nd UE.Composition graphs 2B, suppose that a UE is UE1, then a UE is when generating reference signal, selects the starting resource block n of transmission of reference signals sequence _rB, this starting resource block n _rBno. RB of the RB that first symbol identifying the reference signal sequence that a UE will send maps, determines comb k _tC{ 0,1,2}, the quantity of comb number illustrates comb interval to ∈, and have three comb number in the present embodiment, namely comb is spaced apart 3, according to starting resource block n _rBwith comb k _tCdetermine the initial subcarrier of transmission of reference signals sequence determine the transmission bandwidth of reference signal sequence send bandwidth represent the RB quantity that the sequence of reference signal takies, as Fig. 2 B, sending bandwidth is 2 RB, by sending bandwidth the length of computing reference burst wherein 3 represent comb interval, determine root sequence number, according to length and the root sequence number selection Zadoff-Chu root sequence of reference signal sequence, determine cyclic shift value, according to Zadoff-Chu root sequence and cyclic shift value computing reference burst, wherein reference signal is Zadoff-Chu root sequence and carries out different cyclic shifts and obtain, each UE can select cyclic shift generating reference signal sequence according to antenna port number, different cyclic shifts may be used for distinguishing different antenna ports and UE, the reference signal sequence generated according to foregoing description can be shown below:

$r_{\mathrm{RS}}^{\left(\tilde{p}\right)}\left(n\right)=e^{j{\mathrm{\α}}_{\tilde{p}}n}{r}_u\left(n\right),$ $n=\mathrm{0,1},\·\·\·M_{\mathrm{SC}}^{\mathrm{RS}}-1$

In above formula, $r_u\left(n\right)=\frac{\mathrm{un}(n+1)}{M_{\mathrm{SC}}^{\mathrm{RS}}},$ ${\mathrm{\α}}_{\tilde{p}}=2\mathrm{\π}\frac{n_{\mathrm{cs},\tilde{p}}}{8},$ $n_{\mathrm{cs},\tilde{p}}=(n_{\mathrm{cs}}+\frac{8\tilde{p}}{N_{\mathrm{ap}}})\mathrm{mod}8;$ Wherein, n _cs={ 0,1,2,3,4,5,6,7}, r _un () is Zadoff-Chu root sequence, for cyclic shift, for antenna index, N _apfor antenna port number, n _csselected by a UE, represent eight kinds of cyclic shifts.

Step 202 a: UE sends the transformation parameter of reference signal to the 2nd UE by beep-page message.

In the present embodiment, transformation parameter can comprise the starting resource block n of reference signal sequence _rB, comb k _tC∈ { 0,1,2}, transmission bandwidth namely the OFDM symbol l of cyclic shift value, root sequence number and transmission of reference signals sequence, l represent last OFDM symbol of each subframe.

Step 203 a: UE sends reference signal according to this transformation parameter to the 2nd UE.

In the present embodiment, a UE is according to initial subcarrier k ₀with the length of reference signal sequence reference Signal sequence is mapped to after on last OFDM symbol l of time-domain resource according to comb interval 3, is transferred to the 2nd UE, and the above-mentioned process being mapped to physical resource can be shown below:

In above formula, for reference signal sequence, for the length of reference signal sequence, for the transmission bandwidth of reference signal, N _apfor antenna port number, β _rSfor power control factors, k ₀for initial subcarrier, n _rBfor initial No. RB, k _tCfor comb number, for the carrier number that each RB comprises.For the LTE system shown in Fig. 2 B, wherein be 2, be 12, therefore by being calculated as 8, namely the length of reference signal sequence is 8, accordingly, k '=0,1 ..., 7.

Step 204: the 2nd UE receives the reference signal of a UE transmission according to this transformation parameter.

After 2nd UE receives the transformation parameter of reference signal, can according to starting resource block n _rBwith comb k _tCdetermine the initial subcarrier k of transmission of reference signals sequence ₀, by sending bandwidth the length of computing reference burst according to comb k _tCquantity determination comb interval, then according to initial subcarrier k ₀with the length of reference signal sequence on the corresponding subcarrier of the described OFDM symbol l of the time-domain resource mapped according to comb interval 3, receive the reference signal sequence that a UE sends.

Step 205: the 2nd UE measures the reference signal received, obtains channel quality.

In the present embodiment, 2nd UE calculates the reference signal of the original transmission of a UE according to the Zadoff-Chu root sequence of a UE transmission in step 202 and cyclic shift value, then can by the reference signal received and original reference signals be compared the channel quality obtaining and measure and obtain, concrete measuring process is consistent with reference signal measuring process in existing wireless communications system, does not repeat them here.

Step 206: the 2nd UE selects and the communication resource carrying out between a UE communicating according to channel quality.

In the present embodiment, the 2nd UE selects the process of the communication resource consistent with the selection course in existing wireless communications system according to channel quality, does not repeat them here.Wherein, the communication resource can comprise frequency, bandwidth and the modulation coding mode etc. that carry out D2D communication between a UE and the 2nd UE.

Step 207: the communication resource of selection is informed to a UE by the 2nd UE.

As seen from the above-described embodiment, this embodiment is when realizing the process selecting the D2D communication resource, both sides UE without the need to communication continues to be in transmitting and receiving state, but when can D2D be needed between UE to communicate, the selection of the communication resource is realized by sending reference signal, therefore save the power of the UE both sides of D2D communication, which thereby enhance D2D communication performance; And the 2nd UE can the good channel communication of selectivity by reference to the measurement of signal, avoids the power dissipation that bad channel quality causes, the shortcomings such as poor signal quality, thus improve communication performance.

See Fig. 3, be another embodiment flow chart of the communication means of D2D of the present invention, this embodiment is by describing the process that the 2nd UE selects D2D cooperative communication UE alternately between a UE and the 2nd UE:

Step 301 a: UE generates the reference signal communicated with the 2nd UE.

In the present embodiment, suppose that the 2nd UE will select the UE of cooperative communication from the UE of multiple support D2D communication, wherein a UE is any one UE in the UE of the plurality of support D2D communication, therefore the 2nd UE needs the reference signal by sending a UE to measure, to determine whether a UE is the UE communicated that can cooperate.

Wherein, one UE selects the starting resource block of transmission of reference signals sequence number, comb number, sends bandwidth, cyclic shift value and root sequence number, the initial subcarrier of transmission of reference signals sequence is determined according to starting resource block number and comb number, by sending the length of bandwidth computing reference burst, according to length and the root sequence number selection Zadoff-Chu root sequence of reference signal sequence, according to Zadoff-Chu root sequence and cyclic shift value computing reference burst.Wherein, the concrete instantiation procedure of generating reference signal see the description of Fig. 2 A and Fig. 2 B, can not repeat them here.

Step 302 a: UE sends to the 2nd UE the ability information that a UE has cooperative communication ability by device discovery signal, and is sent the transformation parameter of reference signal to the 2nd UE by beep-page message.

In the present embodiment, the transformation parameter that a UE sends can comprise: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence.

It should be noted that, the ability information that in this step, transformation parameter and a UE have a cooperative communication ability also can send by means of only beep-page message, or sends by means of only device discovery signal, does not limit this present embodiment.

Step 303 a: UE sends reference signal according to this transformation parameter to the 2nd UE.

Wherein, one UE can according to the length of initial subcarrier and reference signal sequence, after on Reference Signal sequence is mapped to last OFDM symbol of time-domain resource corresponding subcarrier according to comb interval, be transferred to the 2nd UE, this comb interval can be the quantity of comb number, the above-mentioned concrete instantiation procedure being mapped to physical resource see the description of Fig. 2 A and Fig. 2 B, can not repeat them here.

Step 304: the 2nd UE receives the reference signal of a UE transmission according to this transformation parameter.

Wherein, 2nd UE can determine the initial subcarrier of transmission of reference signals sequence according to starting resource block number and comb number, by sending the length of bandwidth computing reference burst, according to the quantity determination comb interval of comb number, then according to the length of initial subcarrier and reference signal sequence, on the corresponding subcarrier of the OFDM symbol of the time-domain resource mapped according to comb interval, receive the reference signal sequence that a UE sends.

Step 305: the 2nd UE measures the reference signal received, obtains the channel quality between a UE.

In the present embodiment, the Zadoff-Chu root sequence that 2nd UE can send according to a UE in step 302 and cyclic shift value calculate the reference signal of the original transmission of a UE, then can by the reference signal received and original reference signals be compared the channel quality obtaining and measure and obtain, concrete measuring process is consistent with reference signal measuring process in existing wireless communications system, does not repeat them here.

Step 306: when channel quality exceedes default quality threshold, the 2nd UE selects a UE to cooperate communication.

In the present embodiment, when the channel quality in measurement result exceedes default quality threshold, the 2nd UE can select a UE to cooperate communication; Or, after the 2nd UE obtains the channel quality measurements of multiple UE, can therefrom to cooperate communication by the top-quality UE of selective channel.It should be noted that, can adjust as required according to measurement result select the to cooperate strategy of UE of communication, this embodiment of the present invention is not limited.

Step 307: the 2nd UE notifies that a UE cooperates communication.

As seen from the above-described embodiment, this embodiment is when realizing the D2D communication process selecting cooperative communication, both sides UE without the need to communication continues to be in transmitting and receiving state, but when can D2D be needed between UE to communicate, the selection of the communication resource is realized by sending reference signal, therefore save the power of the UE both sides of D2D communication, which thereby enhance D2D communication performance; Further, in the present embodiment, the 2nd UE can the good UE of selective channel and its cooperative communication, and the cooperation UE gravity treatment avoiding the bad channel quality because of cooperation UE to cause, power dissipation, the shortcomings such as poor signal quality, improve cooperative communication performance with this.

Corresponding with the embodiment of the communication means of D2D of the present invention, present invention also offers the embodiment of the UE performing D2D communication means.

See Fig. 4, be an embodiment block diagram of UE of the present invention, this UE carries out as with the 2nd UE the UE that D2D communicates:

This UE comprises: generation unit 410 and transmitting element 420.

Wherein, generation unit 410, for generating the reference signal communicated with described 2nd UE;

Transmitting element 420, for sending the transformation parameter of the described reference signal that described generation unit 410 generates to described 2nd UE, and send described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal to make described 2nd UE according to described transformation parameter, described reference signal is measured, and carries out communication selection according to measurement result.

In an optional implementation, described generation unit 410 can comprise (not shown in Fig. 4):

Chooser unit, for selecting the starting resource block number of transmission of reference signals sequence, comb number, sending bandwidth, cyclic shift value and root sequence number;

Determine subelement, determine with comb number the initial subcarrier transmitting described reference signal sequence for the starting resource block number according to described chooser Unit selection;

Computation subunit, for by the described length determining reference signal sequence described in the transmission bandwidth calculation that subelement is determined;

Described chooser unit, also for the length of reference signal sequence that calculates according to described computation subunit with describedly select Zadoff-Chu root sequence and cyclic shift value with sequence number;

Described computation subunit, also for calculating described reference signal sequence according to the Zadoff-Chu root sequence of described chooser Unit selection and cyclic shift value.

In another optional implementation, described transmitting element 420 can comprise at least one following subelement (not shown in Fig. 4):

First sends subelement, for being sent the transformation parameter of described reference signal to described 2nd UE by beep-page message;

Second sends subelement, and for passing through device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE; Wherein, also comprise in described device discovery signal or beep-page message: a described UE has the ability information of cooperative communication ability.

In another optional implementation, the transformation parameter of the reference signal that described transmitting element 420 sends can comprise: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence; Described transmitting element 420, can specifically for the length according to described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

See Fig. 5, be another embodiment block diagram of UE of the present invention, this UE carries out as with a UE the 2nd UE that D2D communicates:

This UE comprises: receiving element 510, measuring unit 520 and selected cell 530.

Wherein, receiving element 510, for receiving the transformation parameter of the reference signal that a UE sends, and receives the described reference signal of a described UE transmission according to described transformation parameter;

Measuring unit 520, measures for the described reference signal received described receiving element 510, obtains measurement result;

Selected cell 530, selects for carrying out communication according to the measurement result of described measuring unit 520.

In an optional implementation, described receiving element 510, can specifically for receiving the transformation parameter of the reference signal that a UE is sent by beep-page message; Described selected cell 530, specifically for the channel quality in the described measurement result according to described measuring unit 520 acquisition, can select and the communication resource carrying out between a described UE communicating.

In another optional implementation, described receiving element 510, can specifically for receiving a UE by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission, also comprises the ability information that a described UE has cooperative communication ability in described device discovery signal or beep-page message; Described selected cell 530, can specifically for when the channel quality in the described measurement result that described measuring unit 520 obtains exceedes default quality threshold, selects a described UE to cooperate communication.

In another optional implementation, the transformation parameter that described receiving element 510 receives can comprise: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

Described receiving element 510 can comprise (not shown in Fig. 5):

Computation subunit, for determining according to described starting resource block number and comb number the initial subcarrier transmitting described reference signal sequence, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number;

Receive subelement, for the length according to described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receive the reference signal sequence that a described UE sends.

See Fig. 6, be another embodiment block diagram of UE of the present invention, this UE carries out as with the 2nd UE the UE that D2D communicates:

This UE comprises: the first radio receiving-transmitting unit 610 and first processor 620.

Wherein, described first processor 620, for generating the reference signal communicated with described 2nd UE, and sent the transformation parameter of described reference signal to described 2nd UE by described first radio receiving-transmitting unit 610, and send described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal to make described 2nd UE according to described transformation parameter, described reference signal is measured, and carry out communication selection according to measurement result.

In an optional implementation, described first processor 620, can specifically for selecting the starting resource block number of transmission of reference signals sequence, comb number, send bandwidth, cyclic shift value and root sequence number, determine with described comb number the initial subcarrier transmitting described reference signal sequence according to described starting resource block number, by the length of reference signal sequence described in described transmission bandwidth calculation, according to length and the described sequence number selection Zadoff-Chu root sequence of described reference signal sequence, and calculate described reference signal sequence according to described Zadoff-Chu root sequence and described cyclic shift value.

In another optional implementation, described first processor 620, can, specifically for by described first radio receiving-transmitting unit 610, adopt beep-page message to send the transformation parameter of described reference signal to described 2nd UE; Or, by described first radio receiving-transmitting unit 610, adopt device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE, also comprises the ability information that a described UE has cooperative communication ability in described device discovery signal or beep-page message.

In another optional implementation, the transformation parameter that described first processor 620 is sent by described radio receiving-transmitting unit can comprise: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence; Described first processor 620, can specifically for the length according to described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

See Fig. 7, be another embodiment block diagram of UE of the present invention, this UE carries out as with a UE the 2nd UE that D2D communicates:

This UE comprises: the second radio receiving-transmitting unit 710 and the second processor 720.

Wherein, described second radio receiving-transmitting unit 710, for receiving the transformation parameter of the reference signal that a UE sends, and receives the described reference signal of a described UE transmission according to described transformation parameter;

Described second processor 720, measures for the described reference signal received described second radio receiving-transmitting unit 710, obtains measurement result, and carries out communication selection according to described measurement result.

In an optional implementation, described second radio receiving-transmitting unit 710, can specifically for receiving the transformation parameter of the described reference signal that a UE is sent by beep-page message; Described second processor 720, specifically for according to the channel quality in described measurement result, can select and the communication resource carrying out between a described UE communicating.

In another optional implementation, described second radio receiving-transmitting unit 710, specifically can receive a UE by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission, also comprises the ability information that a described UE has cooperative communication ability in described device discovery signal or beep-page message; Described second processor 720, can specifically for when the channel quality in described measurement result exceedes default quality threshold, selects a described UE to cooperate communication.

In another optional implementation, the transformation parameter that described second radio receiving-transmitting unit 710 receives can comprise: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

Described second processor 720, the initial subcarrier determining to transmit described reference signal sequence according to described starting resource block number and comb number can also be used for, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number; Described second radio receiving-transmitting unit 710, can specifically for the length according to described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receive the reference signal sequence that a described UE sends.

As seen from the above-described embodiment, one UE generates the reference signal communicated with the 2nd UE, the transformation parameter of reference signal is sent to the 2nd UE, and send reference signal according to this transformation parameter to the 2nd UE, after 2nd UE receives reference signal according to this transformation parameter, reference signal is measured, and carries out communication selection according to measurement result.The D2D communication mode of the application embodiment of the present invention, both sides UE without the need to communication continues to be in transmitting and receiving state, but when can D2D be needed between UE to communicate, realizes mutual by sending reference signal, therefore save the power of the UE both sides of D2D communication, which thereby enhance D2D communication performance.

Those skilled in the art can be well understood to the mode that technology in the embodiment of the present invention can add required general hardware platform by software and realize.Based on such understanding, technical scheme in the embodiment of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.

Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.

Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (24)

1. a communication means of device-to-device D2D, is characterized in that, described method comprises:

First user equipment UE generates the reference signal communicated with the 2nd UE;

A described UE sends the transformation parameter of described reference signal to described 2nd UE;

A described UE sends described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal, measures described reference signal to make described 2nd UE according to described transformation parameter, and carries out communication selection according to measurement result.

2. method according to claim 1, is characterized in that, a described UE generates the reference signal communicated with the 2nd UE, comprising:

A described UE selects the starting resource block of transmission of reference signals sequence number, comb number, sends bandwidth, cyclic shift value and root sequence number;

Determine with described comb number the initial subcarrier transmitting described reference signal sequence according to described starting resource block number;

By the length of reference signal sequence described in described transmission bandwidth calculation;

According to length and the described sequence number selection Zadoff-Chu root sequence of described reference signal sequence;

Described reference signal sequence is calculated according to described Zadoff-Chu root sequence and described cyclic shift value.

3. method according to claim 1 and 2, is characterized in that, the transformation parameter that a described UE sends described reference signal to described 2nd UE comprises:

A described UE sends the transformation parameter of described reference signal to described 2nd UE by beep-page message; Or,

A described UE is by device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE; Wherein, also comprise in described device discovery signal or beep-page message: a described UE has the ability information of cooperative communication ability.

4. according to the method in claim 2 or 3, it is characterized in that, described transformation parameter comprises: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence;

A described UE sends described reference signal according to described transformation parameter to described 2nd UE and comprises:

A described UE is according to the length of described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

5. a communication means of device-to-device D2D, is characterized in that, described method comprises:

Second user equipment (UE) receives the transformation parameter of the reference signal that a UE sends;

Described 2nd UE receives the described reference signal of a described UE transmission according to described transformation parameter;

Described 2nd UE measures the described reference signal received, and obtains measurement result;

Described 2nd UE carries out communication according to described measurement result and selects.

6. method according to claim 5, is characterized in that, the transformation parameter that described 2nd UE receives the reference signal that a UE sends comprises: described 2nd UE receives the transformation parameter of the described reference signal that a UE is sent by beep-page message;

Described 2nd UE carries out communication selection according to described measurement result and comprises: described 2nd UE, according to the channel quality in described measurement result, selects and the communication resource carrying out between a described UE communicating.

7. method according to claim 5, it is characterized in that, the transformation parameter that described 2nd UE receives the reference signal that a UE sends comprises: described 2nd UE receives a UE by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission; Also comprise in described device discovery signal or beep-page message: a described UE has the ability information of cooperative communication ability;

Described 2nd UE carries out communication selection according to described measurement result and comprises: when the channel quality in described measurement result exceedes default quality threshold, described 2nd UE selects a described UE to cooperate communication.

8. the method according to claim 6 or 7, is characterized in that, described transformation parameter comprises: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

The reference signal that described 2nd UE receives a described UE transmission according to described transformation parameter comprises:

Described 2nd UE determines according to described starting resource block number and comb number the initial subcarrier transmitting described reference signal sequence, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number;

Described 2nd UE, according to the length of described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receives the reference signal sequence that a described UE sends.

9. a user equipment (UE), is characterized in that, described UE carries out as with the 2nd UE the UE that device-to-device D2D communicates, and comprising:

Generation unit, for generating the reference signal communicated with described 2nd UE;

Transmitting element, for sending the transformation parameter of the described reference signal that described generation unit generates to described 2nd UE, and send described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal to make described 2nd UE according to described transformation parameter, described reference signal is measured, and carries out communication selection according to measurement result.

10. UE according to claim 9, is characterized in that, described generation unit comprises:

Chooser unit, for selecting the starting resource block number of transmission of reference signals sequence, comb number, sending bandwidth, cyclic shift value and root sequence number;

Determine subelement, determine with comb number the initial subcarrier transmitting described reference signal sequence for the starting resource block number according to described chooser Unit selection;

Computation subunit, for by the described length determining reference signal sequence described in the transmission bandwidth calculation that subelement is determined;

Described chooser unit, also for the length of reference signal sequence that calculates according to described computation subunit with describedly select Zadoff-Chu root sequence and cyclic shift value with sequence number;

Described computation subunit, also for calculating described reference signal sequence according to the Zadoff-Chu root sequence of described chooser Unit selection and cyclic shift value.

11. UE according to claim 9 or 10, it is characterized in that, described transmitting element comprises at least one following subelement:

First sends subelement, for being sent the transformation parameter of described reference signal to described 2nd UE by beep-page message;

Second sends subelement, and for passing through device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE; Wherein, also comprise in described device discovery signal or beep-page message: a described UE has the ability information of cooperative communication ability.

12. UE according to claim 10 or 11, it is characterized in that, the transformation parameter of the reference signal that described transmitting element sends comprises: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence;

Described transmitting element, specifically for the length according to described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

13. 1 kinds of user equipment (UE)s, is characterized in that, described UE carries out as with a UE the 2nd UE that device-to-device D2D communicates, and comprising:

Receiving element, for receiving the transformation parameter of the reference signal that a UE sends, and receives the described reference signal of a described UE transmission according to described transformation parameter;

Measuring unit, measures for the described reference signal received described receiving element, obtains measurement result;

Selected cell, selects for carrying out communication according to the measurement result of described measuring unit.

14. UE according to claim 13, is characterized in that, described receiving element, specifically for receiving the transformation parameter of the described reference signal that a UE is sent by beep-page message;

Described selected cell, specifically for the channel quality in the described measurement result that obtains according to described measuring unit, selects and the communication resource carrying out between a described UE communicating.

15. UE according to claim 13, is characterized in that, described receiving element, and specifically for receiving a UE by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission; The ability information that a described UE has cooperative communication ability is also comprised in described device discovery signal or beep-page message;

Described selected cell, specifically for when the channel quality in the described measurement result that described measuring unit obtains exceedes default quality threshold, selects a described UE to cooperate communication.

16. UE according to claims 14 or 15, it is characterized in that, the transformation parameter that described receiving element receives comprises: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

Described receiving element comprises:

Computation subunit, for determining according to described starting resource block number and comb number the initial subcarrier transmitting described reference signal sequence, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number;

Receive subelement, for the length according to described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receive the reference signal sequence that a described UE sends.

17. 1 kinds of user equipment (UE)s, is characterized in that, described UE carries out as with the 2nd UE the UE that device-to-device D2D communicates, and comprising: radio receiving-transmitting unit and processor, wherein,

Described processor, for generating the reference signal communicated with described 2nd UE, and sent the transformation parameter of described reference signal to described 2nd UE by described radio receiving-transmitting unit, and send described reference signal according to described transformation parameter to described 2nd UE, after receiving described reference signal to make described 2nd UE according to described transformation parameter, described reference signal is measured, and carries out communication selection according to measurement result.

18. UE according to claim 17, is characterized in that,

Described processor, specifically for selecting the starting resource block of transmission of reference signals sequence number, comb number, sending bandwidth, cyclic shift value and root sequence number, determine with described comb number the initial subcarrier transmitting described reference signal sequence according to described starting resource block number, by the length of reference signal sequence described in described transmission bandwidth calculation, according to length and the described sequence number selection Zadoff-Chu root sequence of described reference signal sequence, and calculate described reference signal sequence according to described Zadoff-Chu root sequence and described cyclic shift value.

19. UE according to claim 17 or 18, is characterized in that,

Described processor, specifically for by described radio receiving-transmitting unit, adopts beep-page message to send the transformation parameter of described reference signal to described 2nd UE; Or, by described radio receiving-transmitting unit, adopt device discovery signal, or beep-page message sends the transformation parameter of described reference signal to described 2nd UE, also comprises the ability information that a described UE has cooperative communication ability in described device discovery signal or beep-page message.

20. UE according to claim 18 or 19, it is characterized in that, the transformation parameter that described processor is sent by described radio receiving-transmitting unit comprises: described starting resource block number, comb number, send bandwidth, cyclic shift value, root sequence number and transmit the orthogonal frequency division multiplex OFDM symbol of described reference signal sequence;

Described processor, specifically for the length according to described initial subcarrier and described reference signal sequence, after on the corresponding subcarrier described reference signal sequence being mapped to last OFDM symbol of time-domain resource according to comb interval, be transferred to described 2nd UE, described comb is spaced apart the quantity of described comb number.

21. 1 kinds of user equipment (UE)s, is characterized in that, described UE carries out as with a UE the 2nd UE that device-to-device D2D communicates, and comprising: radio receiving-transmitting unit and processor, wherein,

Described radio receiving-transmitting unit, for receiving the transformation parameter of the reference signal that a UE sends, and receives the described reference signal of a described UE transmission according to described transformation parameter;

Described processor, measures for the described reference signal received described radio receiving-transmitting unit, obtains measurement result, and carries out communication selection according to described measurement result.

22. UE according to claim 21, is characterized in that,

Described radio receiving-transmitting unit, specifically for receiving the transformation parameter of the described reference signal that a UE is sent by beep-page message;

Described processor, specifically for according to the channel quality in described measurement result, selects and the communication resource carrying out between a described UE communicating.

23. UE according to claim 21, is characterized in that,

Described radio receiving-transmitting unit, concrete reception the one UE is by device discovery signal, or beep-page message is to the transformation parameter of the reference signal of described 2nd UE transmission, also comprises the ability information that a described UE has cooperative communication ability in described device discovery signal or beep-page message;

Described processor, specifically for when the channel quality in described measurement result exceedes default quality threshold, selects a described UE to cooperate communication.

24. UE according to claim 22 or 23, it is characterized in that, the transformation parameter that described radio receiving-transmitting unit receives comprises: the starting resource block of reference signal sequence number, comb number, send the OFDM symbol of bandwidth, cyclic shift value, root sequence number and transmission of reference signals sequence;

Described processor, also for determining according to described starting resource block number and comb number the initial subcarrier transmitting described reference signal sequence, by the length of reference signal sequence described in described transmission bandwidth calculation, according to the quantity determination comb interval of described comb number;

Described radio receiving-transmitting unit, specifically for the length according to described initial subcarrier and described reference signal sequence, on the corresponding subcarrier of the described OFDM symbol of the time-domain resource mapped according to described comb interval, receive the reference signal sequence that a described UE sends.