KR20140080110A - Method and Apparatus for Configuring Transmission Resource of Discovery Signal in Device-to-Device Communication, Method and Apparatus for Detecting other User Equipment using the same - Google Patents

Method and Apparatus for Configuring Transmission Resource of Discovery Signal in Device-to-Device Communication, Method and Apparatus for Detecting other User Equipment using the same Download PDF

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KR20140080110A
KR20140080110A KR1020120149561A KR20120149561A KR20140080110A KR 20140080110 A KR20140080110 A KR 20140080110A KR 1020120149561 A KR1020120149561 A KR 1020120149561A KR 20120149561 A KR20120149561 A KR 20120149561A KR 20140080110 A KR20140080110 A KR 20140080110A
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terminal
transmission
sensing signal
sensing
signal
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KR1020120149561A
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Korean (ko)
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윤성준
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주식회사 팬택
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools
    • H04W16/20—Network planning tools for indoor coverage or short range network deployment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals

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

Abstract

The present invention relates to a method and apparatus configured of a discovery signal transmission domain for allocating a discovery signal for the detection of terminals in the device-to-device (D2D) communications in a time-frequency domain. The present invention determines a transmission group and a transmission pattern which are the transmission domain of the D2D discovery signal by using unique D2D terminal index information for each terminal.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for setting a transmission area of a terminal sensing signal for communication between terminals, and a terminal sensing method and apparatus using the same. using the same}

The present invention relates to a method and apparatus for configuring a transmission region of a terminal detection signal (Discovery Signal) in a direct communication environment between terminals, and a terminal sensing method and apparatus using the same.

(LTE) or an uplink radio resource of an LTE-Advanced network, for example, in order to provide more diversified services to users and increase communication capacity through more efficient use of bandwidth. (hereinafter referred to as " D2D communication "), which supports direct communication between a plurality of communication devices and equipment.

It is an object of the present invention to provide a method and apparatus for configuring a sensing signal transmission region for allocating a sensing signal for sensing between terminals in time-frequency space in D2D communication.

It is another object of the present invention to provide a method and apparatus for configuring a transmission area of a terminal sensing signal in D2D communication by grouping a plurality of terminals into a maximum of M groups, And to provide a device and method for configuring a terminal detection transmission region so as to be distinguished by a code.

It is another object of the present invention to provide an apparatus and method for determining a transmission group and a transmission pattern, which are transmission regions of a D2D sensing signal, using D2D terminal index information unique to each terminal, And a method thereof.

It is another object of the present invention to provide a D2D terminal which receives a D2D terminal detection signal transmitted in a transmission region (transmission group and transmission pattern) of a D2D sensing signal determined using D2D terminal index information unique to each terminal, A method and an apparatus.

One embodiment of the present invention is a method of setting a transmission area for a D2D terminal sensing signal of a terminal in a D2D communication environment in which the terminal communicates with another terminal, And determining a transmission region in which to transmit the D2D sensing signal using the determined D2D terminal index, wherein the transmission region includes one specific transmission group selected from a plurality of transmission groups divided by time, And a transmission pattern that is selected from among a plurality of transmission patterns classified by terminals in the group.

According to another embodiment of the present invention, there is provided a method of detecting a D2D terminal in a specific terminal interlocked with a plurality of D2D communication terminals, the method comprising: receiving a D2D sensing signal from the other terminal; Extracting the index information and / or the D2D detection signal sequence, and identifying or detecting the corresponding other terminal using the extracted D2D terminal index information and / or the D2D sensing signal sequence. to provide.

According to another embodiment of the present invention, there is provided an apparatus for setting a transmission area for a D2D terminal sensing signal of a terminal in a D2D communication environment in which the terminal communicates with another terminal, the apparatus comprising: And a transmission pattern and / or a transmission pattern for transmission of the D2D sensing signal using the determined D2D terminal index information, the D2D terminal index determining unit determining a D2D terminal index used for determining at least one of a transmission pattern and / A D2D sense signal generator for generating a D2D sense signal by assigning a D2D sense signal sequence to the determined transmission region (transmission group and transmission pattern), and a D2D sense signal generator for generating the D2D sense signal, And a transmitting unit for transmitting to the terminal.

According to another embodiment of the present invention, there is provided a D2D terminal sensing apparatus in a specific terminal interlocked with a plurality of D2D communication terminals, comprising: a D2D sensing signal receiver for receiving a D2D sensing signal from another terminal; A D2D terminal information extracting unit for extracting the index information and / or the D2D detecting signal sequence, and a D2D terminal detecting unit for identifying or detecting the corresponding terminal using the extracted D2D terminal index information and / or the D2D detecting signal sequence, The received D2D sensing signal is a signal obtained by allocating a D2D sensing signal sequence to a transmission region of a transmission group and a transmission pattern determined based on the D2D terminal index information of the other terminal and transmitting the D2D sensing signal.

According to an embodiment of the present invention, when a D2D sensing signal transmission region (transmission group and transmission pattern) is set and a D2D terminal sensing signal is transmitted / received, terminal detection / confirmation Discovery is possible.

1 shows an example of a wireless communication system in which a terminal communicates with a base station.
FIG. 2 illustrates the types of terminal operations required to perform D2D communication.
FIG. 3 illustrates a process of transmitting and receiving an entire terminal sensing signal to which the method of constructing a sensing signal pattern according to the present invention is applied.
4 is a flowchart illustrating a D2D terminal sensing signal transmission process according to an embodiment of the present invention.
FIG. 5 illustrates an example of setting a terminal sensing signal transmission resource according to the present invention.
FIG. 6 shows a flow of a method of constructing a D2D sensing signal transmission region (transmission group and transmission pattern) according to an embodiment of the present invention.
FIG. 7 shows a first embodiment of a method of constructing a transmission group and a transmission pattern of the D2D sensing signal of the present invention when M = 12 and K = 12.
FIG. 8 shows a method of constructing a transmission group and a transmission pattern according to the second embodiment.
FIG. 9 is a configuration diagram of a D2D terminal detection signal transmission apparatus according to an embodiment of the present invention.
FIG. 10 shows an overall flow of a D2D terminal sensing method according to an embodiment of the present invention.
11 is a functional block diagram of a D2D terminal sensing apparatus according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 shows an example of a wireless communication system in which a terminal communicates with a base station.

1, a wireless communication system includes a user equipment (UE) 10 and a base station (BS) 20 that performs uplink and downlink communications with a terminal 10. [

In this specification, the terminal 10 is a comprehensive concept of a terminal in a wireless communication. The terminal 10 may be a mobile station (MS), a user terminal (UT) in GSM as well as a UE (User Equipment) in WCDMA, LTE, HSPA, , A subscriber station (SS), a wireless device, and the like.

The base station 20 may be a station communicating with the terminal 10 and may be a Node-B, an evolved Node-B, a sector, a site, a BTS (Base Transceiver System), an access point, a relay node, and a radio resource head (RRH).

The base station 20 includes various coverage areas such as a megacell, a macro cell, a micro cell, a picocell, a pam cell, a radio resource head (RRH), and a relay node communication range.

On the other hand, D2D communication refers to communication in which the UEs (User Equipments) in the same cell or neighboring cells directly transmit and receive data through the D2D link without going through the base station after establishing the D2D link. Hereinafter, a wireless communication system will be described as an example of an LTE communication system, but the present invention is not limited thereto and applicable to any wireless communication system.

In order to establish direct communication between terminals, location information of each terminal (information on which point is connected to the network) should be shared, and the base station or the central control unit may directly communicate with each terminal .

In the case of D2D communication in which communication is performed without a central control unit, each terminal (capable of performing transmission or reception) that is a target of D2D communication collects information about terminals located within the range of D2D communication capable of D2D communication, And it is necessary to separately inform the counterpart terminal about the counterpart terminal to which the counterpart terminal intends to transmit the information during the D2D communication.

In the present specification, a signal transmitted / received to / from terminals to detect / confirm each other before they communicate with each other will be referred to as a " terminal detection signal ". However, the present invention is not limited to such an expression, but may be used in other expressions such as a terminal search signal and a terminal pilot signal.

FIG. 2 illustrates the types of terminal operations required to perform D2D communication.

As shown in the upper diagram of FIG. 2, each terminal receives and detects a terminal detection signal D2D discovery signal from another terminal, recognizes the existence of a D2D radio resource of another terminal, And transmits a terminal detection signal. This process is a terminal detection signal transmission and terminal detection process related to the present invention.

When there is an object to be transmitted by the neighboring D2D terminals recognized through the terminal detection (D2D Discovery) step, the terminal transmits to the terminal, which is the object of the D2D transmission, And control information necessary for information reception may be transmitted together with the control information. This process may be referred to as D2D control information and a data transfer step.

The terminal that has received the information related to the terminal (D2D reception) transmits the ACK / NACK and / or the close loop control information to the counterpart terminal (D2D transmission) based on the reception signal as shown in the lower diagram of FIG. To the terminal that has performed the request. Depending on the D2D communication scheme, the last step may be omitted.

In the present invention, in the terminal sensing step of the D2D communication described above, when the terminal transmits its terminal detection signal to the counterpart terminal and also confirms the counterpart terminal after receiving the detection signal of the counterpart terminal, In order to efficiently construct the pattern of FIG.

In this specification, the configuration of the sensing signal pattern means a pattern when the terminal allocates the terminal sensing signal transmitted to the opposite terminal to the time-frequency resource space for D2D communication.

That is, it means a pattern in which a sequence of sense signals is allocated to a specific resource element in a time-frequency resource space.

In the wireless communication described in this specification, one radio frame may be composed of ten subframes, and one subframe may be composed of two slots. The radio frame may have a length of 10 ms and the subframe may have a length of 1.0 ms. In general, a basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed in units of subframes.

One slot includes seven symbols in the time domain (for a normal cyclic prefix) or six symbols (for an extended cyclic prefix). In this case, a time-frequency domain defined by 12 subcarriers corresponding to 180 kHz in a frequency domain with one slot in the time domain may be referred to as a resource block (RB), but the present invention is not limited thereto.

Also, a time-frequency resource space defined by one symbol and one subcarrier is referred to as RE, and RE denotes a minimum unit time-frequency resource space to which a signal or a sequence is allocated.

FIG. 3 illustrates a process of transmitting and receiving an entire terminal sensing signal to which the method of constructing a sensing signal pattern according to the present invention is applied.

Referring to FIG. 3, the terminal determines or determines whether to perform D2D communication (S310). That is, when a mode for performing D2D communication is turned on, the terminal transmits a D2D detection signal to another terminal, receives a D2D detection signal from another terminal, and detects a counterpart terminal it will be possible to detect it.

Of course, instead of the step S310, the terminal may always be able to transmit and / or receive the D2D sensing signal in the radio resource at the predetermined time without performing the D2D mode on / off. As mentioned above, It is possible to transmit and / or receive the D2D sensing signal only when the D2D sensing signal is on, and not to transmit and receive the D2D sensing signal when the D2D mode is off.

Also, even if the D2D mode is turned on, the transmission and reception of the D2D sensing signal may be distinguished from each other so that only the D2D sensing signal may be transmitted or only the D2D sensing signal may be received.

(D2D UE Index) from an entity such as an external base station (S320). The transmission of the D2D terminal index may be performed by upper signaling such as RRC (Radio Resource Control) But the present invention is not limited thereto.

In addition, the terminal may include a step S330 of determining its own D2D terminal index by using system information or the like which is received from the outside or already known.

The D2D terminal index is basic information used in constructing the D2D detection signal pattern of the terminal in the present invention, and the type and the generation method of the D2D terminal index will be described in more detail below.

Next, the terminal sets a specific time-frequency resource space to which the D2D detection signal is to be allocated according to the D2D terminal index (S340). If the result of the setting is a transmission region of the D2D sensing signal defined in the present invention, / Or a transmission pattern.

The terminal generates a D2D sensing signal according to the D2D sensing signal pattern specified based on its D2D terminal index and transmits it to another terminal (S350). In the process of generating the D2D sensing signal, a specific D2D sensing signal sequence is generated and the sequence is allocated to a time-frequency resource space according to a predetermined pattern, that is, RE, and an SC-FDMA signal is generated based on the resource, To the UE, but is not limited to the SC-FDMA signal.

Also, the terminal may include a D2D sensing signal receiving and sensing step of receiving a D2D sensing signal from another terminal and then detecting a specific terminal from the D2D sensing signal.

The step of receiving and detecting the D2D detection signal again includes a step S360 of checking a resource space to which the detection signal is mapped after receiving the D2D detection signal from the other terminal and determining a D2D detection signal sequence allocated to the corresponding resource space, And detecting the terminal in step S370.

In operation S360 and S370 of receiving the D2D sensing signal and sensing the other terminal using the D2D sensing signal, an SC-FDMA signal including the D2D sensing signal according to an exemplary embodiment of the present invention is received, And performing de-mapping to extract the D2D detection signal sequence of the other terminal, thereby detecting the other terminal.

3, when the UE determines to transmit the D2D sensing signal, it sets a D2D sensing signal transmission resource according to the pattern configuration scheme according to an embodiment of the present invention, The D2D detection signal is generated and transmitted. In addition, if it is determined to receive the D2D sensing signal, after detecting the reception resource of the received D2D sensing signal, the sensing of the terminal is performed by checking the D2D sensing signal in the reception resource.

In this case, the transmission resource and the reception resource of each D2D sensing signal are based on a D2D terminal index unique to each terminal. Such a D2D terminal index may be scheduled and transmitted by high-layer signaling in a base station or the like, Specific ID or system information such as an RNTI or the like.

4 is a flowchart illustrating a D2D terminal sensing signal transmission process according to an embodiment of the present invention.

The terminal receives its own terminal index information from the outside or determines itself from the system information or the like (S410).

Then, the terminal determines a transmission group and a transmission pattern to transmit the D2D detection signal according to a method described below (S420). Determining the transmission pattern of the sensing signal means determining the time-frequency resource space, more specifically the sensing signal allocation RE or the transmission area, to which to transmit the D2D terminal sensing signal of its own. The present invention is characterized by a pattern configuration method for setting the sensing signal transmission area or the sensing signal allocation RE for each terminal. The pattern configuration method will be described in more detail below.

Then, the terminal maps or allocates the D2D terminal sensing signal sequence to the determined pattern (i.e., the D2D terminal sensing signal transmission region) (S430). Then, the terminal wirelessly modulates the resource area according to a modulation scheme such as SC-FDMA, generates a D2D terminal sensing signal, and transmits the D2D terminal sensing signal to a plurality of counterpart terminals (S440).

The process of transmitting the D2D terminal sensing signal according to FIG. 4 will be summarized as follows.

D2D detection signal transmission resource, and generates and transmits a D2D detection signal in the transmission resource.

Each terminal checks the D2D sensing signal transmission group and the transmission pattern. At this time, the D2D sensing signal transmission group and the transmission pattern are based on a D2D terminal index unique to each UE. The D2D terminal index unique to each terminal is transmitted to a base station through a high layer signaling ), Or may be set based on the unique ID of the terminal such as the RNTI. Since the transmission resources for transmitting the D2D sensing signal are different according to the determined transmission group, the D2D sensing signals of the terminals transmitted in the transmission resources of the same time zone have different D2D sensing signal transmission patterns .

The terminal maps the D2D sensing signal sequence to a resource element corresponding to the D2D sensing signal transmission group and the transmission pattern determined for each terminal, and generates and transmits a D2D sensing signal through the D2D sensing signal sequence.

Hereinafter, a method of group setting and pattern configuration of D2D terminal detection signals according to an embodiment of the present invention will be described in detail.

FIG. 5 illustrates an example of setting a terminal sensing signal transmission resource according to the present invention.

The D2D terminal sensing signal transmission resource setting according to the present invention largely comprises determining a transmission pattern determined for each terminal in a transmission group and a transmission group determined by the terminal index.

The transmission groups are distinguished by time, and the transmission patterns can be distinguished by, but not limited to, frequency division (FDM), time division (TDM), code division (CDM)

In this specification, a sensing signal transmission group determined by a terminal index according to each terminal is denoted by m, and a transmission pattern is denoted by k.

As shown in FIG. 5, each terminal belongs to one of M transmission groups. 5, UE A and UE B belong to transmission group # 0, UE C and UE D belong to transmission group # 1, UE E and UE F belong to transmission group # # M-1. In the next D2D sense signal transmission, UE C and UE F belong to transmission group # 0, UE A and UE E belong to transmission group # 1, and UE B and UE D belong to transmission group # M-1.

In the case of the UE A, in the transmission / reception of the first D2D sensing signal, it belongs to the transmission group # 0, the transmission group # 0 transmits the D2D sensing signal, and the remaining transmission groups receive the D2D sensing signal from the other terminals . At this time, it is possible to receive the D2D detection signals of the UEs other than the UE B belonging to the same transmission group transmitted in the same time zone. In the transmission / reception of the next D2D sensing signal, the D2D sensing signal is transmitted to the transmission group # 1, the transmission group # 1 transmits the D2D sensing signal, and the remaining transmission groups receive the D2D sensing signal from the other terminals. At this time, it is possible to receive the D2D detection signals of the UEs other than the UE E belonging to the same transmission group transmitted in the same time zone. Therefore, UE A can receive the D2D sensing signal from all other terminals through the first and second D2D sensing signal transmission / reception.

Here, the D2D detection signals (for example, UE A and UE B belonging to the transmission group # 0 in the transmission and reception of the first D2D sense signal in FIG. 4) of UEs belonging to the same transmission group transmitted in the same time zone are transmitted by one of FDM, CDM and TDM In the above method, transmission patterns are classified into transmission patterns corresponding to the transmission groups.

FIG. 6 shows a flow of a method of constructing a D2D sensing signal transmission region (transmission group and transmission pattern) according to an embodiment of the present invention.

In order to configure the D2D sensing signal pattern according to an embodiment of the present invention, the terminal first determines its D2D terminal index (S610). The D2D terminal index may be transmitted from outside to each terminal by signaling, or may be a system-specific system information such as an RNTI or a value calculated therefrom.

Next, the terminal determines a transmission group to transmit its D2D detection signal using the determined D2D terminal index (S620). Next, a transmission pattern is determined so that it can be distinguished from other terminals in the transmission group (S630).

As described above, when the transmission group and the transmission pattern for the D2D terminal sensing signal of the specific terminal are determined, the transmission region of the final D2D terminal sensing signal is set (S640)

The transmission group means a time-frequency resource space consisting of two or three symbols in one subframe. More preferably, each transmission group may include two D2D sensing signal allocation symbols and one guard symbol But the present invention is not limited thereto. A terminal belonging to a group in the transmission group transmits its own D2D terminal detection signal and a terminal not belonging to the group receives the transmitted D2D terminal detection signal to detect the corresponding terminal.

In other words, the terminal transmits its own D2D detection signal in the time zone by the predetermined transmission group, and receives the D2D terminal detection signal of the other terminal transmitted in the other time slot, that is, the other transmission group, To detect.

For example, when the total number of transmission groups is M, the specific terminal transmits its D2D terminal detection signal in the m-th transmission group allocated to itself, while in the time zone belonging to the remaining M-1 transmission groups, And D2D terminal detection signal is received to detect (detect or discovery) the other terminal.

In this specification, the entire time period in which a terminal transmits a D2D terminal signal (one transmission group) and receives / detects a D2D terminal detection signal of another terminal (M-1 transmission groups) is referred to as a detection signal transmission / Unit) and denoted by n.

As described above, the basic concept according to the embodiment of the present invention is that the transmission group and the transmission pattern of the D2D terminal detection signal (Discovery Signal) are set according to the D2D terminal index information, The D2D terminal detection signal is generated by mapping the D2D detection signal sequence in the radio resource element and then transmitted to the other terminal. In the radio resource element corresponding to the remaining transmission group, the D2D terminal detection signal of the other terminal is received and detected do.

In one embodiment of the present invention, the D2D sensing signals of the terminals belonging to the same transmission group in the D2D terminal sensing signal transmission / reception mechanism are allocated in transmission resources distinguished from each other by at least one of FDM, CDA and TDM, A D2D sensing signal allocation region divided into terminals in a group can be expressed by a transmission pattern. That is, the D2D sensing signals of the terminals belonging to the same transmission group are classified as transmission patterns in the transmission resources corresponding to the transmission group.

In an embodiment of the present invention, in order to minimize the number of D2D sensing signal transmission / reception times, that is, the number of times that specific terminals are included in the same transmission group during two or more sensing signal transmission / reception time units, each D2D terminal sensing signal transmission / And changes the terminal group belonging to the transmission group.

Hereinafter, a method of setting a transmission group and a transmission pattern of a D2D sensing signal based on D2D terminal index information according to an embodiment of the present invention will be described in detail.

If the total number of transmission groups is M and the number of transmission patterns is K, the total number of D2D sensing signals that can be distinguished according to the D2D terminal index information will be M x K.

In this case, the transmission group and the transmission pattern of the D2D sensing signal according to the D2D terminal index information of each terminal can be set as follows according to the following equation (1).

Of course, Equation (1) is only an example, and the transmission group and transmission pattern of the D2D sensing signal may be set for each terminal according to the D2D terminal index information by various methods.

[Equation 1]

Figure pat00001
or
Figure pat00002

The transmission group m (0? M? M-1) and the transmission pattern k (0? K? K-1) to which the D2D sensing signal of the specific terminal is to be allocated can be determined, 5, a UE having a transmission group m and a transmission pattern k maps a D2D terminal signal sequence to radio resource elements corresponding to a transmission pattern k in a radio resource allocated for a transmission group m, And detects and detects D2D detection signals in the radio resources corresponding to the remaining transmission groups.

Hereinafter, the first to fifth embodiments for setting the transmission group and the transmission pattern will be described. However, the present invention is not limited to these examples. The basic concept and technical idea of the present invention described above (i.e., the D2D sensing signals of the terminals belonging to the same transmission group can be distinguished from each other by one or more of FDM, CDA and TDM, Quot ;, " assignment ").

[ First Embodiment ]

FIG. 7 shows a first embodiment of a method of constructing a transmission group and a transmission pattern of the D2D sensing signal of the present invention when M = 12 and K = 12.

FIG. 7 illustrates an example of using an extended CP (Extended CP) in the current LTE system.

In the LTE system, a total of 12 symbols are present in one subframe in the case of the extended CP. In the first embodiment, each transmission group uses two symbols for D2D terminal signal allocation. Also, one symbol may exist as a guard period between each transmission group and the transmission group.

In this case, as shown in FIG. 7, D2D terminal detection signals for a total of 4 transmission groups can be transmitted in one subframe. If the total number of transmission groups is M = 12, three subframes are used.

In other words, three subframes are used for one transmission / reception of each D2D sensing signal and one unit for transmitting and receiving a D2D terminal sensing signal.

Therefore, although not shown in FIG. 7, another three subframes may be used for transmitting and receiving the next D2D sensing signal. In this case, the sub D2D sensing signal is transmitted and received, that is, The frames may be consecutive sub-frames, or may be sub-frames after a certain period.

For example, a period A ms (A subframe, A may be fixed to one, and one of several periods may be defined by upper-stage signaling. Examples of A are 160 ms, 320 ms, 640 ms, 1280 ms, 2560 ms , 5120 ms, 10240 ms, and 20480 ms, but it is not limited to this), it is possible to perform transmission and reception of the D2D sensing signal twice as shown in FIG. 7 in one cycle using a total of six subframes .

At this time, in order to minimize the number of UEs belonging to the same transmission group in the transmission and reception of the D2D sensing signals as described above, the transmission group to which each terminal belongs changes according to a specific rule for each transmission and reception of D2D sensing signals.

That is, the UEs belonging to the same transmission group in the transmission and reception of the first D2D sensing signal should not be included in the same transmission group at the time of transmission and reception of the next D2D sensing signal.

For example, if n = 0, which is a D2D sensing signal transmission / reception unit, the UEs included in the transmission group m = 0 are UE1, UE2 and UE3, then in the next D2D sensing signal transmission / , UE2, and UE3 are not included at once.

7, the transmission group of each D2D sensing signal can be divided into a total of K transmission patterns.

There are three types of transmission pattern setting schemes as shown in the lower portions A, B, and C of FIG. 7, but the present invention is not limited thereto. In the example of FIG. 7, the A scheme is an example in which the transmission pattern is set to FDM, and the B scheme and C scheme are examples in which the transmission pattern is set to FDM + CDM.

FIG. 7 shows an example of a case where K = 12. In the first transmission pattern determination method (A method of 7), for a total of 12 subcarriers in one resource block (hereinafter referred to as RB) One transmission pattern may be defined for each carrier. Therefore, one transmission pattern can be defined using a total of two REs per terminal.

As another example, in the second transmission pattern determination scheme (scheme B, 7), one transmission pattern may be defined for two subcarriers spaced by six spaces for a total of 12 subcarriers in one RB along the frequency axis. Therefore, one transmission pattern can be defined using a total of four REs for each terminal. At this time, two transmission patterns can be defined simultaneously for the four REs, and the two transmission patterns can be distinguished by an orthogonal sequence such as an OCC (Orthogonal Cover Code) having a length of 2 . That is, for two transmission patterns sharing the same four REs as shown in FIG. 7, one has an orthogonal sequence [1, 1] and the other has an orthogonal sequence [1, -1].

As another example, in the third transmission pattern determination scheme (C scheme of 7), one transmission pattern may be defined for two subcarriers adjacent to each other for a total of 12 subcarriers in one RB along the frequency axis. Therefore, one transmission pattern is defined by using four REs for each terminal similar to the B scheme, but the RE pairs for the same terminal are spaced apart from each other by six REs in the B scheme, And RE pairs for the same terminal are adjacent to each other.

Of course, in the C scheme, two transmission patterns can be defined simultaneously for four REs for the same terminal. These two transmission patterns are orthogonal sequences such as an OCC (Orthogonal Cover Code) having a length of 2 . That is, for two transmission patterns sharing the same four REs as shown in FIG. 7C, one has an orthogonal sequence [1, 1] and the other has an orthogonal sequence [ 1, -1].

Although only one RB is shown in FIG. 7, it is assumed that the total bandwidth (system BW) or the specific bandwidth (in this case, the specific bandwidth may be indicated by upper level signaling and may be predetermined) The transfer pattern can be defined in the same way.

For each resource element corresponding to the transmission pattern defined in the transmission group, each UE maps a D2D sensing signal sequence, and the D2D sensing signal sequence includes a cell ID (cell ID), an RNTI , A subframe number, and a symbol number, generates a pseudo-random sequence for each symbol with respect to a bandwidth defined for the initialization value, maps the generated sequence, and finally generates a D2D sense signal Respectively.

[ Second Embodiment ]

In the first embodiment of FIG. 7, the transmission group and the transmission pattern of the D2D sensing signal when M = 12 and K = 12 are shown for the extended CP. At this time, We defined the Guard Period.

In the first embodiment, a total of three subframes are used. If a guard period is not defined, a total of six groups can be defined in one subframe. Thus, one D2D sense signal transmission / Frame.

FIG. 8 illustrates a method of constructing a transmission group and a transmission pattern according to the second embodiment. As described above, two symbols per transmission group are set as a D2D sensing signal transmission region, but a guard period is not set , A total of six transmission groups are allocated in one subframe.

Also in the second embodiment of FIG. 8, the transmission pattern for each terminal in the same transmission group is the same as in the first embodiment. That is, as in the method A to C of FIG. 7, the FDM + CDM (OCC, etc.) method is used, but the D2D sense signal allocation UEs for a specific terminal may be spaced by six or adjacent to each other .

[ Third and fourth embodiments ]

In the first and second embodiments according to FIGS. 7 and 8, it is for the extended CP, whereas the third and fourth embodiments described below are for the normal CP.

As in the third and fourth embodiments, when the normal CP is used, there are 14 symbols in one subframe. Using only 12 symbols among them, the first and second embodiments A total of three subframes (when a guard period is defined) or a total of two subframes (when a guard period is not defined) for a transmission group and a transmission pattern of a D2D sense signal when M = 12 and K = 12, May be used to perform transmission and reception of a single D2D sensing signal.

In the third and fourth embodiments, the transmission patterns for the terminals in the same transmission group are the same as those in the first and second embodiments, and therefore, the description thereof will be omitted in order to avoid redundancy.

[ Fifth Embodiment ]

In the fifth embodiment, one symbol is divided into three sub-symbols again, and a guard period is set for a total of six subsymbols (i.e., two symbols) and one subsymbol for one transmission group. Can be defined.

That is, in the fifth embodiment, when a normal CP is used, a total of two symbols are used for one transmission group among 14 symbols in one subframe, and 1/3 symbols as a guard period, Symbols, it is possible to define six transmission groups in one sub-frame even if the guard period is defined, and when the total number of transmission groups is M = 12, a total of two sub- And transmit / receive a sensing signal.

In the above description, M = 12, which is the total number of transmission groups, and K = 12, which are the total number of transmission patterns, are only examples, and they can be defined differently depending on the number of terminals to be mutually detected in the D2D communication environment There will be.

In addition, the number of subframes included in one D2D sensing signal transmission / reception unit n may be different from 2 or 3 as described above according to the total number of terminals (M * K) and M and K values defined thereby .

As described above, in the case of transmitting and receiving the D2D terminal sensing signal by setting the transmission group and the transmission pattern according to one of the first to fifth embodiments, it is possible to effectively detect terminal detection among all terminals in the D2D communication environment (Discovery) is possible.

FIG. 9 is a configuration diagram of a D2D terminal detection signal transmission apparatus according to an embodiment of the present invention.

The apparatus for transmitting a D2D terminal sensing signal according to an exemplary embodiment of the present invention may be a terminal having a D2D communication function or a device implemented in the terminal, but is not limited thereto.

The apparatus for transmitting a D2D terminal sense signal according to an embodiment of the present invention includes a D2D terminal for determining a D2D terminal index used for determining at least one of a transmission group and / A transmission region determining unit 920 for determining at least one of a transmission group and / or a transmission pattern for transmitting the D2D sensing signal using the determined D2D terminal index information, A D2D sensing signal generator 930 for allocating a D2D sensing signal sequence to the RE in the transmission group (transmission group and transmission pattern) to generate a D2D sensing signal, and a transmission unit 940 for transmitting the generated D2D sensing signal to another terminal .

The D2D terminal index determination unit 910 may receive terminal index information from the outside by higher layer signaling such as RRC or may directly determine the terminal index information by using system information unique to the terminal such as RNTI.

The transmission region determining unit 920 determines a transmission group and a transmission pattern, which are resource spaces for transmitting the D2D sensing signal according to at least one of the first and fifth embodiments described above. More specifically, the transmission groups are divided according to time, and the transmission patterns of the terminals included in one transmission group are set to be different from each other by at least one of FDM, CDM, and TDM. .

In this case, the transmission area for each transmission group may include two symbols, and one (first and third embodiments), 0 (second and fourth embodiments), and 1/3 For example, the transmission interval of a plurality of terminals in the same transmission group can be divided into a plurality of transmission patterns, and each transmission pattern can be divided into FDM only, FDM + CDM (OCC, etc.) But it is also possible to arrange the UEs with six D2D sense signal allocation UEs for a specific UE to be spaced apart or adjacent to each other

It is also preferable that the grouping of the terminals belonging to the transmission group is changed for each D2D sensing signal transmission / reception unit (n) for one D2D sensing signal, so that terminals belonging to the previous transmission group are not grouped into the same group in the next D2D sensing signal transmission / Do.

 The D2D sense signal generator 930 and the transmitter 940 map the D2D sense signal sequence to the resource element corresponding to the transmission pattern in the transmission group for the specific terminal determined as described above, The BS has an initialization value based on at least one of a cell ID (cell ID), an RNTI, a subframe number, and a symbol number as defined in the pseudo-random sequence. A random sequence is generated and the D2D detection signal is finally generated after the mapping and transmitted

FIG. 10 shows an overall flow of a D2D terminal sensing method according to an embodiment of the present invention.

A method of detecting a D2D terminal in a specific terminal interlocked with a plurality of D2D communication terminals, the method comprising: receiving (S1010) a D2D sensing signal from the other terminal in operation S1010; and receiving D2D terminal index information and / (S1020) of extracting a D2D sensing signal sequence, and identifying or sensing a corresponding terminal using the extracted D2D terminal index information and / or the D2D sensing signal sequence (S1030) The received D2D detection signal means a signal obtained by allocating a D2D sensing signal sequence to a transmission region of a transmission group and a transmission pattern determined by the corresponding terminal based on the D2D terminal index information, as described above.

The structure for determining the transmission region (transmission group and / or transmission pattern) based on the D2D terminal index information is the same as that described above, and thus a detailed description thereof will be omitted.

11 is a functional block diagram of a D2D terminal sensing apparatus according to an embodiment of the present invention.

The D2D terminal sensing apparatus according to an embodiment of the present invention may be a terminal itself having a D2D communication function or a device implemented in the terminal, but the present invention is not limited thereto.

A D2D terminal sensing apparatus according to an exemplary embodiment of the present invention includes a D2D sensing signal receiving unit (S1110) for receiving a D2D sensing signal from another terminal and a D2D sensing signal receiving unit (S1110) for extracting D2D terminal index information and / or a D2D sensing signal sequence from the received D2D sensing signal And a D2D terminal sensing unit S1130 for identifying or sensing the corresponding terminal using the extracted D2D terminal index information and / or the D2D sensing signal sequence. In this case, The received D2D detection signal means a signal obtained by allocating a D2D sensing signal sequence to a transmission region of a transmission group and a transmission pattern determined by the corresponding terminal based on the D2D terminal index information, as described above.

The D2D terminal sensing apparatus transmits its own D2D sensing signal in one transmission group to all the M transmission groups, receives the D2D sensing signal of the other terminal for the remaining M-1 transmission groups, .

As described above, according to an embodiment of the present invention, when a D2D sensing signal transmission region (transmission group and transmission pattern) is set and a D2D terminal sensing signal is transmitted / received, ) Or confirmation (discovery) is possible.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (14)

A method for establishing a transmission region for a D2D terminal sensing signal of a terminal in a D2D (Device to Device) communication environment in which the terminal communicates with another terminal,
Determining the D2D terminal index of the terminal;
And determining a transmission region for transmitting the D2D sensing signal using the determined D2D terminal index,
Wherein the transmission region is defined as one transmission pattern selected from among a plurality of transmission patterns selected from a plurality of transmission groups separated by time and a plurality of transmission patterns classified by terminals in the specific transmission group, D2D terminal detection signal transmission area setting method. The method according to claim 1,
Wherein each of the transmission groups includes two symbols. 3. The method of claim 2,
Wherein each of the transmission groups further comprises a guard period consisting of one symbol. The method according to claim 1,
Wherein each of the plurality of transmission patterns belonging to a specific transmission group is divided by at least one of frequency division and code division. 5. The method of claim 4,
Each of the transmission patterns is allocated to one terminal, and the D2D sensing signal allocation transmission region for the same terminal is spaced apart by 6 resource elements in the frequency axis, or in one resource block Wherein the resource element is a resource element adjacent to a frequency axis of the D2D terminal. The method according to claim 1,
Wherein the D2D terminal index information is received from the outside by upper layer signaling or is determined from system information specific to the terminal. The method according to claim 6,
Wherein the system information specific to the terminal includes an RNTI. The method according to claim 1,
Wherein the terminal belonging to the transmission group is changed in the D2D sensing signal transmission / reception unit of the next procedure. A D2D terminal sensing method in a specific terminal interworking with a plurality of D2D (device to device) communication terminals,
Receiving the D2D detection signal from the other terminal;
Extracting the D2D terminal index information and / or the D2D sensing signal sequence from the received D2D sensing signal;
And identifying or detecting the corresponding other terminal using the extracted D2D terminal index information and / or the D2D sensing signal sequence. 10. The method of claim 9,
Wherein the received D2D sensing signal is a signal obtained by allocating a D2D sensing signal sequence to a transmission region of a transmission group and a transmission pattern determined based on the D2D terminal index information of the other terminal. An apparatus for setting a transmission area for a D2D (device to device) terminal detection signal in a D2D communication environment in which a terminal communicates with another terminal,
A D2D terminal index determining unit for determining a D2D terminal index used for determining at least one of a transmission group and / or a transmission pattern, which is a resource space for transmitting the D2D terminal sensing signal;
A transmission region determining unit determining at least one of a transmission group and / or a transmission pattern for transmission of the D2D sensing signal using the determined D2D terminal index information;
A D2D sense signal generation unit for generating a D2D sense signal by allocating a D2D sense signal sequence to the determined transmission region (transmission group and transmission pattern);
A transmitting unit for transmitting the generated D2D sensing signal to another terminal;
The D2D terminal detection signal transmission area setting device comprising: 12. The method of claim 11,
Wherein the transmission groups are divided according to time, and the transmission patterns of the terminals included in one transmission group are distinguished from each other by at least one of FDM, CDM, and TDM. 13. The method of claim 12,
Wherein the transmission region for each transmission group includes two symbols and further includes a guard period of one, zero, or one third symbol. A D2D terminal sensing apparatus in a specific terminal interworking with a plurality of D2D (device to device) communication terminals,
A D2D sense signal receiver for receiving a D2D sense signal from another terminal;
A D2D terminal information extracting unit for extracting the D2D terminal index information and / or the D2D sensing signal sequence from the received D2D sensing signal;
And a D2D terminal sensing unit for identifying or sensing a corresponding terminal using the extracted D2D terminal index information and / or the D2D sensing signal sequence,
Wherein the received D2D sensing signal is a signal obtained by allocating a D2D sensing signal sequence to a transmission region of a transmission group and a transmission pattern determined based on the D2D terminal index information of the other terminal.
KR1020120149561A 2012-12-20 2012-12-20 Method and Apparatus for Configuring Transmission Resource of Discovery Signal in Device-to-Device Communication, Method and Apparatus for Detecting other User Equipment using the same KR20140080110A (en)

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