CN104244449B - The communication means and user equipment of device-to-device - Google Patents
The communication means and user equipment of device-to-device Download PDFInfo
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Abstract
The embodiment of the invention discloses the communication means and UE of D2D, the described method includes：First user equipment (UE) generates the reference signal with the second UE communication；First UE sends the configured transmission of the reference signal to the 2nd UE；First UE sends the reference signal according to the configured transmission to the 2nd UE, so that after the 2nd UE receives the reference signal according to the configured transmission, the reference signal is measured, and carry out communication selection according to measurement result.The embodiment of the present invention is continuously in transmitting and reception state without the both sides UE of communication, but when can need the D2D to communicate between UE, realize interaction by sending reference signal, therefore the power of the UE both sides of D2D communications is saved, which thereby enhance D2D communication performances.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a Device to Device (D2D) communication method and a User Equipment (UE).
Background
In recent years, wireless communication technology has been greatly developed, and currently, common wireless communication networks include cellular networks. In a cellular network, when a data packet is transmitted between two UEs with a longer transmission distance, the data packet needs to be transmitted from an originating UE to a base station, and then from the base station to a terminating UE. When the transmission distance between two UEs is short, in order to save air interface transmission resources and reduce the overhead of base station control signaling, communication may be performed in a D2D manner, that is, direct communication between the originating UE and the terminating UE is performed without base station forwarding. In the prior art, the D2D communication method may be specifically Wireless Fidelity (WiFi) or the like.
During the research of the prior art, the inventor finds that, when the existing D2D communication method is used to implement communication between two UEs, the originating UE needs to continuously transmit signals in order to discover the terminating UE, and correspondingly, the terminating UE also needs to continuously receive signals in order to maintain communication connection with the originating UE. Therefore, in the conventional D2D communication method, in order to maintain the communication connection between two UEs, the two UEs need to be in the transmitting and receiving states continuously, which wastes the power of the UEs and reduces the D2D communication performance.
Disclosure of Invention
The embodiment of the invention provides a communication method of D2D and UE (user equipment), which are used for solving the problems that the power of the UE is wasted and the communication performance is not high in a D2D communication mode in the prior art.
In order to solve the technical problem, the embodiment of the invention discloses the following technical scheme:
in a first aspect, a communication method of D2D is provided, the method including:
a first User Equipment (UE) generates a reference signal communicated with a second UE;
the first UE sends the transmission parameters of the reference signals to the second UE;
and the first UE sends the reference signal to the second UE according to the transmission parameter, so that the second UE measures the reference signal after receiving the reference signal according to the transmission parameter and performs communication selection according to the measurement result.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the generating, by the first UE, a reference signal for communicating with a second UE includes:
the first UE selects an initial resource block number, a comb number, a transmission bandwidth, a cyclic shift value and a root sequence number of a transmission reference signal sequence;
determining a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number;
calculating the length of the reference signal sequence according to the transmission bandwidth;
selecting a Zadoff-Chu root sequence according to the length of the reference signal sequence and the root sequence number;
and calculating the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the sending, by the first UE, the transmission parameter of the reference signal to the second UE includes:
the first UE sends the transmission parameters of the reference signals to the second UE through a paging message; or,
the first UE sends the transmission parameters of the reference signals to the second UE through a device discovery signal or a paging message; wherein, the device discovery signal or the paging message further includes: the first UE has capability information of cooperative communication capability.
With reference to the first possible implementation manner of the first aspect or the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the transmission parameter includes: the starting resource block number, comb number, transmission bandwidth, cyclic shift value, root sequence number and Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmitting the reference signal sequence;
the sending, by the first UE, the reference signal to the second UE according to the transmission parameter includes: and the first UE maps the reference signal sequence to a corresponding subcarrier of the last OFDM symbol of the time domain resource according to the length of the starting subcarrier and the reference signal sequence and then transmits the reference signal sequence to the second UE, wherein the comb tooth interval is the number of the comb tooth numbers.
In a second aspect, there is provided a device-to-device D2D communication method, the method comprising:
the second user equipment UE receives the transmission parameters of the reference signals sent by the first UE;
the second UE receives the reference signal sent by the first UE according to the transmission parameter;
the second UE measures the received reference signal to obtain a measurement result;
and the second UE performs communication selection according to the measurement result.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the receiving, by the second UE, the transmission parameter of the reference signal sent by the first UE includes: the second UE receives the transmission parameters of the reference signals sent by the first UE through paging messages;
the second UE performing communication selection according to the measurement result includes: and the second UE selects communication resources for communicating with the first UE according to the channel quality in the measurement result.
With reference to the second aspect, in a third possible implementation manner of the first aspect, the receiving, by the second UE, the transmission parameter of the reference signal sent by the first UE includes: the second UE receives a transmission parameter of a reference signal sent to the second UE by the first UE through a device discovery signal or a paging message; the device discovery signal or the paging message further includes: capability information that the first UE has cooperative communication capability;
the second UE performing communication selection according to the measurement result includes: and when the channel quality in the measurement result exceeds a preset quality threshold, the second UE selects the first UE for cooperative communication.
With reference to the first possible implementation manner of the second aspect or the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the transmission parameter includes: the method comprises the steps of determining the number of an initial resource block, the number of comb teeth, the transmission bandwidth, the cyclic shift value, the root sequence number of a reference signal sequence and an OFDM symbol for transmitting the reference signal sequence;
the receiving, by the second UE, the reference signal sent by the first UE according to the transmission parameter includes:
the second UE determines an initial subcarrier for transmitting the reference signal sequence according to the initial resource block number and the comb tooth number, calculates the length of the reference signal sequence according to the transmission bandwidth, and determines comb tooth intervals according to the number of the comb tooth numbers;
and the second UE receives the reference signal sequence sent by the first UE on the corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval according to the length of the starting subcarrier and the reference signal sequence.
In a third aspect, a user equipment, UE, as a first UE in device-to-device, D2D, communication with a second UE is provided, comprising:
a generating unit configured to generate a reference signal for communication with the second UE;
a sending unit, configured to send the transmission parameter of the reference signal generated by the generating unit to the second UE, and send the reference signal to the second UE according to the transmission parameter, so that the second UE measures the reference signal after receiving the reference signal according to the transmission parameter, and performs communication selection according to a measurement result.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the generating unit includes:
a selection subunit, configured to select an initial resource block number, a comb number, a transmission bandwidth, a cyclic shift value, and a root sequence number of a transmission reference signal sequence;
a determining subunit, configured to determine, according to the starting resource block number and the comb tooth number selected by the selecting subunit, a starting subcarrier for transmitting the reference signal sequence;
a calculating subunit, configured to calculate a length of the reference signal sequence according to the transmission bandwidth determined by the determining subunit;
the selecting subunit is further configured to select a Zadoff-Chu root sequence and a cyclic shift value according to the length of the reference signal sequence calculated by the calculating subunit and the tracking sequence number;
the calculating subunit is further configured to calculate the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value selected by the selecting subunit.
With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the sending unit includes at least one of the following sub-units:
a first sending subunit, configured to send, to the second UE, a transmission parameter of the reference signal through a paging message;
a second transmitting subunit, configured to transmit the transmission parameter of the reference signal to the second UE through a device discovery signal or a paging message; wherein, the device discovery signal or the paging message further includes: the first UE has capability information of cooperative communication capability.
With reference to the first possible implementation manner of the third aspect or the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the transmission parameters of the reference signal sent by the sending unit include the starting resource block number, the comb number, the sending bandwidth, the cyclic shift value, the root sequence number, and an orthogonal frequency division multiplexing, OFDM, symbol in which the reference signal sequence is transmitted;
the sending unit is specifically configured to map the reference signal sequence to a corresponding subcarrier of a last OFDM symbol of a time domain resource according to comb tooth intervals according to the lengths of the starting subcarrier and the reference signal sequence, and then transmit the reference signal sequence to the second UE, where the comb tooth intervals are the number of the comb tooth numbers.
In a fourth aspect, a user equipment, UE, as a second UE in device-to-device, D2D, communication with a first UE, is provided, comprising:
a receiving unit, configured to receive a transmission parameter of a reference signal sent by a first UE, and receive the reference signal sent by the first UE according to the transmission parameter;
the measuring unit is used for measuring the reference signal received by the receiving unit to obtain a measuring result;
and the selection unit is used for carrying out communication selection according to the measurement result of the measurement unit.
With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the receiving unit is specifically configured to receive a transmission parameter of the reference signal sent by a first UE through a paging message;
the selecting unit is specifically configured to select a communication resource for communicating with the first UE according to the channel quality in the measurement result obtained by the measuring unit.
With reference to the fourth aspect, in a third possible implementation manner of the fourth aspect, the receiving unit is specifically configured to receive a transmission parameter of a reference signal sent by a first UE to a second UE through a device discovery signal or a paging message; the device discovery signal or the paging message further comprises capability information that the first UE has cooperative communication capability;
the selecting unit is specifically configured to select the first UE for cooperative communication when the channel quality in the measurement result obtained by the measuring unit exceeds a preset quality threshold.
With reference to the first possible implementation manner of the fourth aspect or the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the transmission parameters received by the receiving unit include: the method comprises the steps of determining the number of an initial resource block, the number of comb teeth, the transmission bandwidth, the cyclic shift value, the root sequence number of a reference signal sequence and an OFDM symbol for transmitting the reference signal sequence;
the receiving unit includes:
a calculating subunit, configured to determine, according to the starting resource block number and the comb tooth number, a starting subcarrier for transmitting the reference signal sequence, calculate the length of the reference signal sequence according to the transmission bandwidth, and determine a comb tooth interval according to the number of the comb tooth numbers;
and a receiving subunit, configured to receive, according to the length of the starting subcarrier and the reference signal sequence, the reference signal sequence sent by the first UE on a corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval.
In a fifth aspect, a user equipment, UE, is provided, the UE being a first UE in device-to-device, D2D, communication with a second UE, comprising: a wireless transceiver and a processor, wherein,
the processor is configured to generate a reference signal for communicating with the second UE, send a transmission parameter of the reference signal to the second UE through the wireless transceiver, and send the reference signal to the second UE according to the transmission parameter, so that the second UE measures the reference signal after receiving the reference signal according to the transmission parameter, and performs communication selection according to a measurement result.
With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the processor is specifically configured to select a starting resource block number, a comb tooth number, a transmission bandwidth, a cyclic shift value, and a root sequence number for transmitting a reference signal sequence, determine a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number, calculate a length of the reference signal sequence according to the transmission bandwidth, select a Zadoff-Chu root sequence according to the length of the reference signal sequence and the root sequence number, and calculate the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value.
With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the processor is specifically configured to send, by the radio transceiver, the transmission parameter of the reference signal to the second UE by using a paging message; or, sending the transmission parameter of the reference signal to the second UE by using a device discovery signal or a paging message through the wireless transceiver, where the device discovery signal or the paging message further includes capability information that the first UE has cooperative communication capability.
With reference to the first possible implementation manner of the fifth aspect or the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the transmission parameters sent by the processor through the wireless transceiver include: the starting resource block number, comb number, transmission bandwidth, cyclic shift value, root sequence number and Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmitting the reference signal sequence;
the processor is specifically configured to map the reference signal sequence to a corresponding subcarrier of a last OFDM symbol of a time domain resource according to comb tooth intervals according to the lengths of the starting subcarrier and the reference signal sequence, and transmit the reference signal sequence to the second UE, where the comb tooth intervals are the number of comb tooth numbers.
In a sixth aspect, there is provided a user equipment, UE, as a second UE in device-to-device, D2D, communication with a first UE, comprising:
a wireless transceiver and a processor, wherein,
the wireless transceiver is configured to receive a transmission parameter of a reference signal sent by a first UE, and receive the reference signal sent by the first UE according to the transmission parameter;
the processor is configured to measure the reference signal received by the wireless transceiver, obtain a measurement result, and perform communication selection according to the measurement result.
With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the radio transceiver is specifically configured to receive transmission parameters of the reference signal sent by the first UE through a paging message;
the processor is specifically configured to select a communication resource for communicating with the first UE according to the channel quality in the measurement result.
With reference to the sixth aspect, in a third possible implementation manner of the sixth aspect, the radio transceiver specifically receives a transmission parameter of a reference signal sent by a first UE to the second UE through a device discovery signal or a paging message, where the device discovery signal or the paging message further includes capability information that the first UE has cooperative communication capability;
the processor is specifically configured to select the first UE for cooperative communication when the channel quality in the measurement result exceeds a preset quality threshold.
With reference to the first possible implementation manner of the sixth aspect or the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the transmission parameters received by the radio transceiver include: the method comprises the steps of determining the number of an initial resource block, the number of comb teeth, the transmission bandwidth, the cyclic shift value, the root sequence number of a reference signal sequence and an OFDM symbol for transmitting the reference signal sequence;
the processor is further configured to determine an initial subcarrier for transmitting the reference signal sequence according to the initial resource block number and the comb tooth number, calculate the length of the reference signal sequence according to the transmission bandwidth, and determine a comb tooth interval according to the number of the comb tooth numbers;
the radio transceiver is specifically configured to receive, according to the lengths of the starting subcarrier and the reference signal sequence, the reference signal sequence sent by the first UE on a corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval.
In the embodiment of the invention, the first UE generates a reference signal communicated with the second UE, transmits the transmission parameter of the reference signal to the second UE and transmits the reference signal to the second UE according to the transmission parameter, and the second UE measures the reference signal after receiving the reference signal according to the transmission parameter and selects communication according to the measurement result. By applying the D2D communication mode of the embodiment of the invention, the UE of two communicating parties is not required to be in the transmitting and receiving states continuously, but the interaction can be realized by sending the reference signal when the D2D communication is required between the UE, so the power of the UE of the D2D communication is saved, and the D2D communication performance is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1A is a flow chart of one embodiment of a communication method D2D of the present invention;
FIG. 1B is a flow chart of another embodiment of a communication method D2D according to the present invention;
FIG. 2A is a flow chart of another embodiment of a communication method D2D according to the present invention;
FIG. 2B is a schematic diagram of time-frequency resources of a reference signal according to an embodiment of the present invention;
fig. 3 is a flow chart of another embodiment of a communication method D2D according to the present invention;
FIG. 4 is a block diagram of an embodiment of a UE of the present invention;
FIG. 5 is a block diagram of another embodiment of a UE of the present invention;
FIG. 6 is a block diagram of another embodiment of a UE of the present invention;
fig. 7 is a block diagram of another embodiment of a UE of the present invention.
Detailed Description
The following embodiments of the present invention provide a communication method of D2D and a UE. As both parties of D2D communication, the first UE may be an originating UE of communication, and the second UE may be a receiving UE of communication.
In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1A, there is a flowchart of an embodiment of the communication method of D2D of the present invention, which describes the D2D communication procedure from the first UE side:
step 101: the first UE generates a reference signal that is communicated with a second UE.
The first UE selects an initial resource block number, a comb tooth number, a transmission bandwidth, a cyclic shift value and a root sequence number of a transmission reference signal sequence, determines an initial subcarrier of the transmission reference signal sequence according to the initial resource block number and the comb tooth number, calculates the length of the reference signal sequence through the transmission bandwidth, selects a Zadoff-Chu root sequence according to the length of the reference signal sequence and the root sequence number, and calculates the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value.
Step 102: the first UE sends the transmission parameters of the reference signals to the second UE.
Optionally, when the D2D communication resource is selected between the first UE and the second UE, the first UE may send the transmission parameter of the reference signal to the second UE through a paging message;
optionally, when the second UE selects a cooperative UE for D2D cooperative communication, the first UE may send the transmission parameters of the reference signal to the second UE through a device discovery signal or a paging message, and further, the device discovery signal or the paging message may further include capability information that the first UE has cooperative communication capability.
Step 103: and the first UE sends a reference signal to the second UE according to the transmission parameter, so that the second UE measures the reference signal after receiving the reference signal according to the transmission parameter and performs communication selection according to the measurement result.
The transmission parameters in this embodiment may include: a starting resource block number of the reference signal sequence, a comb number, a transmission bandwidth, a cyclic shift value, a root sequence number, and an Orthogonal Frequency Division Multiplexing (OFDM) symbol transmitting the reference signal sequence. The first UE may map the reference signal sequence to a corresponding subcarrier of a last OFDM symbol of the time domain resource according to a comb tooth interval according to lengths of the starting subcarrier and the reference signal sequence, and then transmit the reference signal sequence to the second UE, where the comb tooth interval may be the number of comb tooth numbers, for example, if the comb tooth numbers are 0,1, and 2, the comb tooth interval is 3.
As can be seen from the foregoing embodiments, this embodiment does not require that the UEs of both communicating parties are continuously in the transmitting and receiving states, but can implement interaction by sending the reference signal when D2D communication is required between the UEs, so power of both UEs of D2D communication is saved, thereby improving D2D communication performance.
Referring to fig. 1B, there is a flow chart of another embodiment of the communication method of D2D of the present invention, which describes the D2D communication procedure from the second UE side:
step 111: and the second UE receives the transmission parameters of the reference signals sent by the first UE.
Optionally, when the D2D communication resource is selected between the first UE and the second UE, the second UE may receive the transmission parameter of the reference signal sent by the first UE through the paging message; when the second UE selects a UE for D2D cooperative communication, the second UE may receive transmission parameters of a reference signal sent by the first UE to the second UE through a device discovery signal or a paging message, where the device discovery signal or the paging message may further include capability information that the first UE has cooperative communication capability.
In this embodiment, the transmission parameters may include: a starting resource block number, a comb number, a transmission bandwidth, a cyclic shift value, a root sequence number of the reference signal sequence, and an OFDM symbol transmitting the reference signal sequence.
Step 112: and the second UE receives the reference signal sent by the first UE according to the transmission parameter.
Specifically, the second UE may determine a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number, calculate the length of the reference signal sequence through the transmission bandwidth, determine the comb tooth interval according to the number of the comb tooth numbers, and then receive the reference signal sequence transmitted by the first UE on a corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval according to the lengths of the starting subcarrier and the reference signal sequence.
Step 113: and the second UE measures the received reference signal to obtain a measurement result.
Step 114: and the second UE performs communication selection according to the measurement result.
Optionally, when the D2D communication resource is selected between the first UE and the second UE, the second UE may select the communication resource for communicating with the first UE according to the channel quality in the measurement result; when the second UE selects a UE for D2D cooperative communication, the second UE may select the first UE for cooperative communication if the channel quality in the measurement exceeds a preset quality threshold.
As can be seen from the foregoing embodiments, this embodiment does not require that the UEs of both communicating parties are continuously in the transmitting and receiving states, but can implement interaction by sending the reference signal when D2D communication is required between the UEs, so power of both UEs of D2D communication is saved, thereby improving D2D communication performance.
Referring to fig. 2A, a flow chart of another embodiment of the communication method of D2D of the present invention describes a process of selecting D2D communication resources through interaction between a first UE and a second UE:
step 201: the first UE generates a reference signal that is communicated with a second UE.
Referring to fig. 2B, a schematic diagram of time-frequency resources of a reference signal in the embodiment of the present invention is shown:
in fig. 2B, it is assumed that a transmission bandwidth of the reference signal is two Resource Blocks (RBs), each RB is composed of 12 subcarriers in a frequency domain Resource and is composed of one 1ms subframe in a time domain Resource, and each subframe includes 14 OFDM symbols. In this embodiment, the last OFDM symbol of each subframe is used to transmit the reference signal, and each RB may transmit the reference signals of three UEs, namely UE1, UE2 and UE3, simultaneously, as shown in fig. 2B, the subcarriers of UE1, UE2 and UE3 are sequentially cycled from the first subcarrier of each RB, that is, each UE may transmit the reference signal at three comb intervals on each RB, and each UE has four subcarriers on each RB.
In this embodiment, assuming that the first UE and the second UE are ready to perform D2D communication and need to determine communication parameters, or the channel parameters need to be determined again between the first UE and the second UE performing D2D communication, the channel detection needs to be performed again between the first UE and the second UE. Referring to fig. 2B, assuming that the first UE is UE1, the first UE selects the starting resource block number n for transmitting the reference signal sequence when generating the reference signalRBThe starting resource block number nRBIdentifying the RB number of the RB mapped by the first symbol of the reference signal sequence to be transmitted by the first UE, and determining the comb number kTCE {0,1,2}, the number of comb teeth number represents the comb tooth interval, there are three combs in this embodimentNumber of teeth, i.e. comb spacing of 3, according to starting resource block number nRBAnd comb number kTCDetermining a starting subcarrier for transmitting a reference signal sequenceDetermining a transmission bandwidth of a reference signal sequenceTransmission bandwidthNumber of RBs occupied by sequence representing reference signal, FIG. 2B, transmission bandwidth is 2 RBs, by which transmission bandwidthCalculating the length of a reference signal sequenceWherein 3 represents a comb interval, determines a root sequence number, selects a Zadoff-Chu root sequence according to the length of a reference signal sequence and the root sequence number, determines a cyclic shift value, and calculates the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value, wherein a reference signal is obtained by performing different cyclic shifts on the Zadoff-Chu root sequence, each UE can select the cyclic shift according to the number of antenna ports to generate the reference signal sequence, different cyclic shifts can be used for distinguishing different antenna ports from the UEs, and the reference signal sequence generated according to the above description can be represented by the following formula:
in the above formula, the first and second carbon atoms are, wherein,ncs＝{0,1,2,3,4,5,6,7}，ru(n) is a Zadoff-Chu root sequence,in order to perform the cyclic shift, the bit rate of the bit rate is set to be a cyclic shift,as an antenna index, NapIs the number of antenna ports, ncsThe selection by the first UE represents eight cyclic shifts.
Step 202: the first UE sends the transmission parameters of the reference signals to the second UE through the paging message.
In this embodiment, the transmission parameter may include a starting resource block number n of the reference signal sequenceRBComb number kTCE {0,1,2}, transmission bandwidthThe cyclic shift value, the root sequence number, and the OFDM symbol l, l transmitting the reference signal sequence represent the last OFDM symbol of each subframe.
Step 203: and the first UE sends the reference signal to the second UE according to the transmission parameter.
In this embodiment, the first UE performs the operation according to the starting subcarrier k0And length of reference signal sequenceMapping the reference signal sequence to the last OFDM symbol l of the time domain resource according to the comb tooth interval 3, and transmitting the reference signal sequence to the second UEThe process of mapping to physical resources may be as follows:
in the above formula, the first and second carbon atoms are,for the purpose of a reference signal sequence,for the length of the reference signal sequence,is the transmission bandwidth of the reference signal, Napis the number of antenna ports, βRSIs a power control factor, k0Is the starting subcarrier, nRBIs the starting RB number, kTCThe number of the comb teeth is the same as that of the comb teeth,the number of carriers included for each RB. Take the LTE system shown in FIG. 2B as an example, whereinIs the number of 2, and the number of the second,is 12, thereforeBy calculating 8, i.e. the length of the reference signal sequence is 8, correspondingly, k' =0, 1.
Step 204: and the second UE receives the reference signal sent by the first UE according to the transmission parameter.
After receiving the transmission parameters of the reference signal, the second UE may determine the number n of the initial resource blockRBAnd comb number kTCDetermining a starting subcarrier k of a transmitted reference signal sequence0Through the delivery stripWidth ofCalculating the length of a reference signal sequenceAccording to the number k of comb teethTCDetermines the comb spacing and then based on the starting subcarrier k0And length of reference signal sequenceAnd receiving a reference signal sequence sent by the first UE on a corresponding subcarrier of the OFDM symbol l of the time domain resource mapped according to the comb tooth interval 3.
Step 205: and the second UE measures the received reference signal to obtain the channel quality.
In this embodiment, the second UE calculates the reference signal originally sent by the first UE according to the Zadoff-Chu root sequence and the cyclic shift value sent by the first UE in step 202, and then obtains the measured channel quality by comparing the received reference signal with the original reference signal, where a specific measurement process is consistent with a measurement process of a reference signal in an existing wireless communication system, and is not described herein again.
Step 206: the second UE selects communication resources for communication with the first UE according to the channel quality.
In this embodiment, the process of selecting the communication resource by the second UE according to the channel quality is consistent with the selection process in the existing wireless communication system, and is not described herein again. The communication resource may include a frequency, a bandwidth, a modulation and coding scheme, and the like of D2D communication between the first UE and the second UE.
Step 207: the second UE notifies the first UE of the selected communication resource.
As can be seen from the foregoing embodiments, when the process of selecting D2D communication resources is implemented, it is not necessary that UEs of both communicating parties are continuously in transmitting and receiving states, but rather, when D2D communication is required between UEs, the selection of the communication resources can be implemented by sending reference signals, so that power of both UEs of D2D communication is saved, thereby improving D2D communication performance; and the second UE can select a channel with better performance for communication through the measurement of the reference signal, so that the defects of power waste, poor signal quality and the like caused by poor channel quality are avoided, and the communication performance is improved.
Referring to fig. 3, there is a flow chart of another embodiment of the communication method of D2D of the present invention, which describes the process of selecting a UE for D2D cooperative communication by the second UE through interaction between the first UE and the second UE:
step 301: the first UE generates a reference signal that is communicated with a second UE.
In this embodiment, it is assumed that the second UE is to select a UE for cooperative communication from a plurality of UEs supporting D2D communication, where the first UE is any one of the plurality of UEs supporting D2D communication, and therefore the second UE needs to measure a reference signal transmitted by the first UE to determine whether the first UE is a UE capable of cooperative communication.
The first UE selects an initial resource block number, a comb tooth number, a transmission bandwidth, a cyclic shift value and a root sequence number of a transmission reference signal sequence, determines an initial subcarrier of the transmission reference signal sequence according to the initial resource block number and the comb tooth number, calculates the length of the reference signal sequence through the transmission bandwidth, selects a Zadoff-Chu root sequence according to the length of the reference signal sequence and the root sequence number, and calculates the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value. For a specific example process of generating the reference signal, reference may be made to the descriptions of fig. 2A and fig. 2B, which are not described herein again.
Step 302: the first UE transmits capability information that the first UE has cooperative communication capability to the second UE through the device discovery signal, and transmits transmission parameters of the reference signal to the second UE through the paging message.
In this embodiment, the transmission parameters sent by the first UE may include: a starting resource block number, a comb number, a transmission bandwidth, a cyclic shift value, a root sequence number of the reference signal sequence, and an OFDM symbol transmitting the reference signal sequence.
It should be noted that, in this step, the transmission parameter and the capability information that the first UE has the cooperative communication capability may also be sent only by a paging message or only by a device discovery signal, which is not limited in this embodiment.
Step 303: and the first UE sends the reference signal to the second UE according to the transmission parameter.
The first UE may map the reference signal sequence to a corresponding subcarrier of a last OFDM symbol of the time domain resource according to a comb tooth interval according to the lengths of the starting subcarrier and the reference signal sequence, and then transmit the mapped reference signal sequence to the second UE, where the comb tooth interval may be the number of comb tooth numbers, and the specific exemplary process of mapping to the physical resource may refer to the description in fig. 2A and fig. 2B, which is not described herein again.
Step 304: and the second UE receives the reference signal sent by the first UE according to the transmission parameter.
The second UE may determine a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number, calculate the length of the reference signal sequence through the transmission bandwidth, determine the comb tooth interval according to the number of the comb tooth numbers, and then receive the reference signal sequence transmitted by the first UE on a corresponding subcarrier of an OFDM symbol of the time domain resource mapped according to the comb tooth interval according to the lengths of the starting subcarrier and the reference signal sequence.
Step 305: and the second UE measures the received reference signal to obtain the channel quality with the first UE.
In this embodiment, the second UE may calculate the reference signal originally sent by the first UE according to the Zadoff-Chu root sequence and the cyclic shift value sent by the first UE in step 302, and then may obtain the measured channel quality by comparing the received reference signal with the original reference signal, where a specific measurement process is consistent with a measurement process of a reference signal in an existing wireless communication system, and is not described herein again.
Step 306: and when the channel quality exceeds a preset quality threshold, the second UE selects the first UE for cooperative communication.
In this embodiment, when the channel quality in the measurement result exceeds a preset quality threshold, the second UE may select the first UE for cooperative communication; or, after the second UE obtains the channel quality measurement results of multiple UEs, the UE with the best channel quality may be selected from the channel quality measurement results to perform cooperative communication. It should be noted that the policy for selecting the UE performing cooperative communication according to the measurement result may be adjusted as needed, and the embodiment of the present invention is not limited thereto.
Step 307: the second UE notifies the first UE to perform cooperative communication.
As can be seen from the foregoing embodiments, when implementing the D2D communication process of selecting cooperative communication, the embodiments do not need to continuously enable the UEs of both communicating parties to be in the transmitting and receiving states, but can implement the selection of communication resources by sending reference signals when D2D communication is needed between the UEs, thereby saving the power of both UEs of D2D communication, and thus improving the D2D communication performance; in addition, in this embodiment, the second UE can select a UE with a better channel to perform cooperative communication with the second UE, so as to avoid the disadvantages of reselection of the cooperative UE, power waste, poor signal quality, and the like caused by poor channel quality of the cooperative UE, thereby improving cooperative communication performance.
Corresponding to the embodiment of the communication method of the D2D of the invention, the invention also provides an embodiment of the UE performing the D2D communication method.
Referring to fig. 4, a block diagram of an embodiment of a UE according to the present invention, the UE being a first UE in D2D communication with a second UE:
the UE includes: a generating unit 410 and a transmitting unit 420.
Wherein the generating unit 410 is configured to generate a reference signal for communication with the second UE;
a sending unit 420, configured to send the transmission parameter of the reference signal generated by the generating unit 410 to the second UE, and send the reference signal to the second UE according to the transmission parameter, so that after the second UE receives the reference signal according to the transmission parameter, the reference signal is measured, and communication selection is performed according to a measurement result.
In an alternative implementation, the generating unit 410 may include (not shown in fig. 4):
a selection subunit, configured to select an initial resource block number, a comb number, a transmission bandwidth, a cyclic shift value, and a root sequence number of a transmission reference signal sequence;
a determining subunit, configured to determine, according to the starting resource block number and the comb tooth number selected by the selecting subunit, a starting subcarrier for transmitting the reference signal sequence;
a calculating subunit, configured to calculate a length of the reference signal sequence according to the transmission bandwidth determined by the determining subunit;
the selecting subunit is further configured to select a Zadoff-Chu root sequence and a cyclic shift value according to the length of the reference signal sequence calculated by the calculating subunit and the tracking sequence number;
the calculating subunit is further configured to calculate the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value selected by the selecting subunit.
In another alternative implementation, the sending unit 420 may include at least one of the following sub-units (not shown in fig. 4):
a first sending subunit, configured to send, to the second UE, a transmission parameter of the reference signal through a paging message;
a second transmitting subunit, configured to transmit the transmission parameter of the reference signal to the second UE through a device discovery signal or a paging message; wherein, the device discovery signal or the paging message further includes: the first UE has capability information of cooperative communication capability.
In another optional implementation manner, the transmission parameters of the reference signal transmitted by the transmitting unit 420 may include the starting resource block number, the comb number, the transmission bandwidth, the cyclic shift value, the root sequence number, and the orthogonal frequency division multiplexing OFDM symbol transmitting the reference signal sequence; the sending unit 420 may be specifically configured to map the reference signal sequence to a corresponding subcarrier of a last OFDM symbol of a time domain resource according to a comb tooth interval according to the length of the starting subcarrier and the length of the reference signal sequence, and then transmit the reference signal sequence to the second UE, where the comb tooth interval is the number of comb tooth numbers.
Referring to fig. 5, a block diagram of another embodiment of the UE of the present invention, which is a second UE in D2D communication with a first UE:
the UE includes: a receiving unit 510, a measuring unit 520 and a selecting unit 530.
The receiving unit 510 is configured to receive a transmission parameter of a reference signal sent by a first UE, and receive the reference signal sent by the first UE according to the transmission parameter;
a measuring unit 520, configured to measure the reference signal received by the receiving unit 510 to obtain a measurement result;
a selecting unit 530, configured to perform communication selection according to the measurement result of the measuring unit 520.
In an optional implementation manner, the receiving unit 510 may be specifically configured to receive a transmission parameter of a reference signal sent by a first UE through a paging message; the selecting unit 530 may be specifically configured to select a communication resource for communicating with the first UE according to the channel quality in the measurement result obtained by the measuring unit 520.
In another optional implementation manner, the receiving unit 510 may be specifically configured to receive a transmission parameter of a reference signal sent by a first UE to the second UE through a device discovery signal or a paging message, where the device discovery signal or the paging message further includes capability information that the first UE has cooperative communication capability; the selecting unit 530 may be specifically configured to select the first UE for cooperative communication when the channel quality in the measurement result obtained by the measuring unit 520 exceeds a preset quality threshold.
In another optional implementation manner, the transmission parameters received by the receiving unit 510 may include: the method comprises the steps of determining the number of an initial resource block, the number of comb teeth, the transmission bandwidth, the cyclic shift value, the root sequence number of a reference signal sequence and an OFDM symbol for transmitting the reference signal sequence;
the receiving unit 510 may include (not shown in fig. 5):
a calculating subunit, configured to determine, according to the starting resource block number and the comb tooth number, a starting subcarrier for transmitting the reference signal sequence, calculate the length of the reference signal sequence according to the transmission bandwidth, and determine a comb tooth interval according to the number of the comb tooth numbers;
and a receiving subunit, configured to receive, according to the length of the starting subcarrier and the reference signal sequence, the reference signal sequence sent by the first UE on a corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval.
Referring to fig. 6, a block diagram of another embodiment of the UE of the present invention, which is a first UE in D2D communication with a second UE:
the UE includes: a first wireless transceiver 610 and a first processor 620.
The first processor 620 is configured to generate a reference signal for communicating with the second UE, send a transmission parameter of the reference signal to the second UE through the first radio transceiver 610, and send the reference signal to the second UE according to the transmission parameter, so that the second UE measures the reference signal after receiving the reference signal according to the transmission parameter, and performs communication selection according to a measurement result.
In an optional implementation manner, the first processor 620 may be specifically configured to select a starting resource block number, a comb tooth number, a transmission bandwidth, a cyclic shift value, and a root sequence number for transmitting a reference signal sequence, determine a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number, calculate a length of the reference signal sequence according to the transmission bandwidth, select a Zadoff-Chu root sequence according to the length of the reference signal sequence and the root sequence number, and calculate the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value.
In another alternative implementation, the first processor 620 may be specifically configured to send, by the first radio transceiver 610, the transmission parameter of the reference signal to the second UE by using a paging message; or, the first radio transceiver 610 transmits the transmission parameter of the reference signal to the second UE by using a device discovery signal or a paging message, where the device discovery signal or the paging message further includes capability information that the first UE has cooperative communication capability.
In another alternative implementation, the transmission parameters transmitted by the first processor 620 through the wireless transceiver may include: the starting resource block number, comb number, transmission bandwidth, cyclic shift value, root sequence number and Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmitting the reference signal sequence; the first processor 620 may be specifically configured to map the reference signal sequence to a corresponding subcarrier of a last OFDM symbol of a time domain resource according to a comb tooth interval according to the length of the starting subcarrier and the length of the reference signal sequence, and then transmit the reference signal sequence to the second UE, where the comb tooth interval is the number of comb tooth numbers.
Referring to fig. 7, a block diagram of another embodiment of the UE of the present invention, which is a second UE in D2D communication with a first UE:
the UE includes: a second wireless transceiver 710 and a second processor 720.
The second radio transceiver 710 is configured to receive a transmission parameter of a reference signal sent by a first UE, and receive the reference signal sent by the first UE according to the transmission parameter;
the second processor 720 is configured to measure the reference signal received by the second wireless transceiver 710, obtain a measurement result, and perform communication selection according to the measurement result.
In an optional implementation manner, the second radio transceiver 710 may be specifically configured to receive transmission parameters of the reference signal sent by the first UE through a paging message; the second processor 720 may be specifically configured to select a communication resource for communicating with the first UE according to the channel quality in the measurement result.
In another optional implementation manner, the second radio transceiver 710 may specifically receive transmission parameters of a reference signal sent by a first UE to the second UE through a device discovery signal or a paging message, where the device discovery signal or the paging message further includes capability information that the first UE has cooperative communication capability; the second processor 720 may be specifically configured to select the first UE for cooperative communication when the channel quality in the measurement result exceeds a preset quality threshold.
In another alternative implementation, the transmission parameters received by the second wireless transceiver 710 may include: the method comprises the steps of determining the number of an initial resource block, the number of comb teeth, the transmission bandwidth, the cyclic shift value, the root sequence number of a reference signal sequence and an OFDM symbol for transmitting the reference signal sequence;
the second processor 720 may be further configured to determine a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number, calculate the length of the reference signal sequence according to the transmission bandwidth, and determine the comb tooth interval according to the number of the comb tooth numbers; the second radio transceiver 710 may be specifically configured to receive, according to the lengths of the starting subcarrier and the reference signal sequence, the reference signal sequence sent by the first UE on a corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval.
As can be seen from the foregoing embodiments, the first UE generates a reference signal for communication with the second UE, sends a transmission parameter of the reference signal to the second UE, and sends the reference signal to the second UE according to the transmission parameter, and after receiving the reference signal according to the transmission parameter, the second UE measures the reference signal and performs communication selection according to a measurement result. By applying the D2D communication mode of the embodiment of the invention, the UE of two communicating parties is not required to be in the transmitting and receiving states continuously, but the interaction can be realized by sending the reference signal when the D2D communication is required between the UE, so the power of the UE of the D2D communication is saved, and the D2D communication performance is improved.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A method of device-to-device D2D communication, the method comprising:
the method comprises the steps that first User Equipment (UE) selects an initial resource block number, a comb tooth number, a sending bandwidth, a cyclic shift value and a root sequence number of a transmission reference signal sequence;
determining a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number;
calculating the length of the reference signal sequence according to the transmission bandwidth;
selecting a Zadoff-Chu root sequence according to the length of the reference signal sequence and the root sequence number;
calculating the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value;
the first UE sends transmission parameters of the reference signal to a second UE, and the transmission parameters comprise: the starting resource block number, comb number, transmission bandwidth, cyclic shift value, root sequence number and Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmitting the reference signal sequence;
and the first UE maps the reference signal sequence to a corresponding subcarrier of the last OFDM symbol of the time domain resource according to the length of the starting subcarrier and the reference signal sequence and then transmits the reference signal sequence to the second UE, wherein the comb tooth interval is the number of the comb tooth numbers, so that the second UE measures the reference signal after receiving the reference signal according to the transmission parameter and performs communication selection according to the measurement result.
2. The method of claim 1, wherein sending, by the first UE, the transmission parameters of the reference signal to the second UE comprises:
the first UE sends the transmission parameters of the reference signals to the second UE through a paging message; or,
the first UE sends the transmission parameters of the reference signals to the second UE through a device discovery signal or a paging message; wherein, the device discovery signal or the paging message further includes: the first UE has capability information of cooperative communication capability.
3. A method of device-to-device D2D communication, the method comprising:
receiving, by a second user equipment UE, a transmission parameter of a reference signal sent by a first UE, where the transmission parameter includes: the method comprises the steps of determining the number of an initial resource block, the number of comb teeth, the transmission bandwidth, the cyclic shift value, the root sequence number of a reference signal sequence and an OFDM symbol for transmitting the reference signal sequence;
the second UE determines an initial subcarrier for transmitting the reference signal sequence according to the initial resource block number and the comb tooth number, calculates the length of the reference signal sequence according to the transmission bandwidth, and determines comb tooth intervals according to the number of the comb tooth numbers;
the second UE receives the reference signal sequence sent by the first UE on the corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval according to the length of the starting subcarrier and the reference signal sequence;
the second UE measures the received reference signal to obtain a measurement result;
and the second UE performs communication selection according to the measurement result.
4. The method of claim 3, wherein the second UE receiving the transmission parameters of the reference signal sent by the first UE comprises: the second UE receives the transmission parameters of the reference signals sent by the first UE through paging messages;
the second UE performing communication selection according to the measurement result includes: and the second UE selects communication resources for communicating with the first UE according to the channel quality in the measurement result.
5. The method of claim 3, wherein the second UE receiving the transmission parameters of the reference signal sent by the first UE comprises: the second UE receives a transmission parameter of a reference signal sent to the second UE by the first UE through a device discovery signal or a paging message; the device discovery signal or the paging message further includes: capability information that the first UE has cooperative communication capability;
the second UE performing communication selection according to the measurement result includes: and when the channel quality in the measurement result exceeds a preset quality threshold, the second UE selects the first UE for cooperative communication.
6. A user equipment, UE, as a first UE in device-to-device, D2D, communication with a second UE, comprising:
a generating unit, the generating unit comprising:
a selection subunit, configured to select an initial resource block number, a comb number, a transmission bandwidth, a cyclic shift value, and a root sequence number of a transmission reference signal sequence;
a determining subunit, configured to determine, according to the starting resource block number and the comb tooth number selected by the selecting subunit, a starting subcarrier for transmitting the reference signal sequence;
a calculating subunit, configured to calculate a length of the reference signal sequence according to the transmission bandwidth determined by the determining subunit;
the selecting subunit is further configured to select a Zadoff-Chu root sequence and a cyclic shift value according to the length of the reference signal sequence calculated by the calculating subunit and the root sequence number;
the calculating subunit is further configured to calculate the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value selected by the selecting subunit;
a sending unit, configured to send, to the second UE, transmission parameters of the reference signal generated by the generating unit, where the transmission parameters include: the starting resource block number, the comb tooth number, the sending bandwidth, the cyclic shift value, the root sequence number and the orthogonal frequency division multiplexing OFDM symbol for transmitting the reference signal sequence, and according to the length of the starting subcarrier and the reference signal sequence, the reference signal sequence is mapped to the corresponding subcarrier of the last OFDM symbol of the time domain resource according to the comb tooth interval, and then is transmitted to the second UE, wherein the comb tooth interval is the number of the comb tooth number, so that the second UE can measure the reference signal after receiving the reference signal according to the transmission parameter, and can perform communication selection according to the measurement result.
7. The UE of claim 6, wherein the sending unit comprises at least one of the following sub-units:
a first sending subunit, configured to send, to the second UE, a transmission parameter of the reference signal through a paging message;
a second transmitting subunit, configured to transmit the transmission parameter of the reference signal to the second UE through a device discovery signal or a paging message; wherein, the device discovery signal or the paging message further includes: the first UE has capability information of cooperative communication capability.
8. A user equipment, UE, as a second UE in device-to-device, D2D, communication with a first UE, comprising:
a receiving unit, configured to receive a transmission parameter of a reference signal sent by a first UE, where the transmission parameter includes: the method comprises the steps of determining an initial resource block number, a comb tooth number, a sending bandwidth, a cyclic shift value, a root sequence number of a reference signal sequence and an OFDM symbol for transmitting the reference signal sequence, determining an initial subcarrier for transmitting the reference signal sequence according to the initial resource block number and the comb tooth number, calculating the length of the reference signal sequence through the sending bandwidth, determining a comb tooth interval according to the number of the comb tooth numbers, and receiving the reference signal sequence transmitted by a first UE on a corresponding subcarrier of the OFDM symbol of a time domain resource mapped according to the comb tooth interval according to the lengths of the initial subcarrier and the reference signal sequence;
the measuring unit is used for measuring the reference signal received by the receiving unit to obtain a measuring result;
and the selection unit is used for carrying out communication selection according to the measurement result of the measurement unit.
9. The UE according to claim 8, wherein the receiving unit is specifically configured to receive the transmission parameters of the reference signal sent by the first UE through a paging message;
the selecting unit is specifically configured to select a communication resource for communicating with the first UE according to the channel quality in the measurement result obtained by the measuring unit.
10. The UE according to claim 8, wherein the receiving unit is specifically configured to receive transmission parameters of a reference signal sent by a first UE to the second UE through a device discovery signal or a paging message; the device discovery signal or the paging message further comprises capability information that the first UE has cooperative communication capability;
the selecting unit is specifically configured to select the first UE for cooperative communication when the channel quality in the measurement result obtained by the measuring unit exceeds a preset quality threshold.
11. A user equipment, UE, as a first UE in device-to-device, D2D, communication with a second UE, comprising: a wireless transceiver and a processor, wherein,
the processor is configured to select a starting resource block number, a comb tooth number, a transmission bandwidth, a cyclic shift value, and a root sequence number for transmitting a reference signal sequence, determine a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number, calculate a length of the reference signal sequence through the transmission bandwidth, select a Zadoff-Chu root sequence according to the length of the reference signal sequence and the root sequence number, calculate the reference signal sequence according to the Zadoff-Chu root sequence and the cyclic shift value, and transmit a transmission parameter of the reference signal to the second UE through the wireless transceiver, where the transmission parameter includes: the starting resource block number, the comb tooth number, the sending bandwidth, the cyclic shift value, the root sequence number and the orthogonal frequency division multiplexing OFDM symbol for transmitting the reference signal sequence, and according to the length of the starting subcarrier and the reference signal sequence, the reference signal sequence is mapped to the corresponding subcarrier of the last OFDM symbol of the time domain resource according to the comb tooth interval, and then is transmitted to the second UE, wherein the comb tooth interval is the number of the comb tooth number, so that the second UE can measure the reference signal after receiving the reference signal according to the transmission parameter, and can perform communication selection according to the measurement result.
12. The UE of claim 11,
the processor is specifically configured to send, by the radio transceiver, the transmission parameter of the reference signal to the second UE by using a paging message; or, sending the transmission parameter of the reference signal to the second UE by using a device discovery signal or a paging message through the wireless transceiver, where the device discovery signal or the paging message further includes capability information that the first UE has cooperative communication capability.
13. A user equipment, UE, as a second UE in device-to-device, D2D, communication with a first UE, comprising: a wireless transceiver and a processor, wherein,
the wireless transceiver is configured to receive transmission parameters of a reference signal sent by a first UE, where the transmission parameters include: receiving a reference signal sequence sent by the first UE on a corresponding subcarrier of the OFDM symbol of the time domain resource mapped according to the comb tooth interval according to the length of the starting subcarrier and the reference signal sequence;
the processor is configured to determine a starting subcarrier for transmitting the reference signal sequence according to the starting resource block number and the comb tooth number, calculate the length of the reference signal sequence according to the transmission bandwidth, determine a comb tooth interval according to the number of the comb tooth numbers, measure the reference signal received by the wireless transceiver, obtain a measurement result, and perform communication selection according to the measurement result.
14. The UE of claim 13,
the wireless transceiver is specifically configured to receive a transmission parameter of the reference signal sent by the first UE through a paging message;
the processor is specifically configured to select a communication resource for communicating with the first UE according to the channel quality in the measurement result.
15. The UE of claim 13,
the wireless transceiver specifically receives a transmission parameter of a reference signal sent by a first UE to a second UE through a device discovery signal or a paging message, where the device discovery signal or the paging message further includes capability information that the first UE has cooperative communication capability;
the processor is specifically configured to select the first UE for cooperative communication when the channel quality in the measurement result exceeds a preset quality threshold.
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| CN108702612B (en) * | 2016-03-22 | 2021-06-01 | 华为技术有限公司 | D2D communication method and device |
| CN107371249B (en) | 2016-05-13 | 2023-04-11 | 中兴通讯股份有限公司 | Configuration method of transmission parameters, base station, information transmission method and terminal |
| CN109479288B (en) * | 2017-01-11 | 2021-06-01 | 华为技术有限公司 | Terminal communication method and communication equipment |
| EP3585115B1 (en) | 2017-03-30 | 2021-09-22 | Huawei Technologies Co., Ltd. | Data exchange method, terminal device, and network device |
| WO2018228527A1 (en) * | 2017-06-16 | 2018-12-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Method, terminal device and network device for handling coexistence of terminal devices with different sidelink capability sets |
| CN110381463B (en) * | 2018-04-12 | 2021-02-26 | 维沃移动通信有限公司 | Method and equipment for transmitting sidelink information |
| WO2020107424A1 (en) * | 2018-11-30 | 2020-06-04 | Oppo广东移动通信有限公司 | Channel quality measurement method in d2d communication and terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101114868A (en) * | 2006-07-25 | 2008-01-30 | 大唐移动通信设备有限公司 | Feedback channel distribution indicating method and system |
| CN102265699A (en) * | 2008-12-30 | 2011-11-30 | 高通股份有限公司 | Centralized control of peer discovery pilot transmission |
| CN102308609A (en) * | 2009-01-23 | 2012-01-04 | 瑞典爱立信有限公司 | Uplink reference signal allocation and assignment for cell clusters |
| CN103108405A (en) * | 2011-11-15 | 2013-05-15 | 中兴通讯股份有限公司 | Method and system of wireless communication |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2524563B1 (en) * | 2010-01-15 | 2014-03-19 | Telefonaktiebolaget L M Ericsson (PUBL) | Methods and apparatus for contention-based granting in a wireless communication network |
-
2013
- 2013-06-20 CN CN201310247647.XA patent/CN104244449B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101114868A (en) * | 2006-07-25 | 2008-01-30 | 大唐移动通信设备有限公司 | Feedback channel distribution indicating method and system |
| CN102265699A (en) * | 2008-12-30 | 2011-11-30 | 高通股份有限公司 | Centralized control of peer discovery pilot transmission |
| CN102308609A (en) * | 2009-01-23 | 2012-01-04 | 瑞典爱立信有限公司 | Uplink reference signal allocation and assignment for cell clusters |
| CN103108405A (en) * | 2011-11-15 | 2013-05-15 | 中兴通讯股份有限公司 | Method and system of wireless communication |
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Effective date of registration: 20191231 Address after: 314415 within huangwan town government, Haining City, Jiaxing City, Zhejiang Province Patentee after: Haining huangwan town Asset Management Co., Ltd Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: Huawei Technologies Co., Ltd. |