JP2017201836A - User device and signal transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to efficiently detect a signal addressed to itself in a user apparatus while suppressing an overhead amount in a D2D communication.SOLUTION: A user apparatus that performs D2D communication by radio includes signal transmission means for transmitting a signal including an identifier of a transmission source of a physical layer associated with an identifier of a transmission source of an upper layer. The signal transmitting means generates an identifier of the transmission source of the physical layer by applying a hash function to the identifier of the transmission source of the upper layer, maps the identifier of the transmission source of the physical layer to a reference signal, and transmits the reference signal.SELECTED DRAWING: Figure 3

Description

  The present invention relates to inter-terminal (D2D) communication, and particularly relates to a technique in which a terminal (hereinafter referred to as a user apparatus UE) detects a signal addressed to itself.

  In mobile communication, the user apparatus UE and the base station eNB generally perform communication between the user apparatuses UE by performing communication (cellular communication). However, in recent years, the user apparatus UE is used by using an LTE radio interface. Various techniques for D2D communication (also referred to as device-to-device communication) that perform direct communication between devices are being studied.

  In the D2D communication technique, the user apparatus UE performs direct communication between the user apparatuses UE using radio resources (time / frequency resources) used in LTE communication. As D2D communication, for example, one user apparatus UE transmits (broadcasts) a Discovery signal (discovery signal) including its own identification information, and the other user apparatus UE receives the Discovery signal, so that the communication partner There is communication such as discovering the user apparatus UE.

  When the user apparatus UE is within the coverage of the base station eNB, the radio resource used by the user apparatus UE for D2D communication is allocated from the base station eNB to the user apparatus UE as a resource pool for D2D communication, for example. With such assignment, cellular communication and D2D communication can be mixed. Furthermore, it has been studied to enable D2D communication even when the user apparatus UE is outside the coverage of the base station eNB.

JP 2013-034165 A

  In cellular communication, the user apparatus UE receives various signals from the base station eNB by radio, but the signal transmitted from the base station eNB to the user apparatus UE is an identifier of the user apparatus UE (hereinafter referred to as ID). And the user apparatus UE detects a signal addressed to the user apparatus UE based on the ID. As an example of such an ID, there is an RNTI assigned to the user apparatus UE from the base station eNB. Receiving a signal to be received separately from other signals using the ID may be called filtering.

  Also in D2D communication, it is necessary to give some ID to the D2D signal so that the user apparatus UE can detect a signal to be received. However, as described above, assuming that D2D communication is performed even outside the coverage, it is desirable that the ID is not an ID set from the base station eNB.

  Now, the radio interface protocol between the base station eNB and the user equipment UE in LTE is composed of PHY that is Layer 1 and Layer 2 that is composed of MAC, RLC, and PDCP. The same applies to D2D communication. The use of a wireless interface protocol is being considered. Here, the PHY is a physical layer, and performs processing such as modulation and encoding of a radio frequency carrier for radio signal transmission. In layer 2, for example, retransmission control or the like is performed.

  At present, in D2D communication, studies are being made to support IDs for filtering signals to be received by PHY and MAC. That is, it is considered that IDs are assigned by both PHY packets and MAC packets, but it is conceivable that the overhead amount increases by transmitting IDs by PHY and MAC. In order to suppress such an increase in overhead amount, for example, it is conceivable to transmit only the MAC ID.

  However, if only the MAC ID is transmitted, the receiving side user equipment UE does not know whether the MAC packet is destined for itself unless the PHY data is demodulated / decoded to obtain the MAC header. Consumption increases and is inefficient. In order to eliminate such inefficiency, it is necessary to transmit the PHY ID together with the MAC ID. In this case, the overhead amount increases as described above.

  The present invention has been made in view of the above points, and provides a technique that enables a user apparatus to efficiently detect a signal addressed to the user apparatus while suppressing an overhead amount in D2D communication. Objective.

According to an embodiment of the present invention, a user apparatus that performs D2D communication wirelessly,
Signal transmitting means for transmitting a signal including a physical layer transmission source identifier associated with an upper layer transmission source identifier;
The signal transmission means generates a physical layer transmission source identifier by applying a hash function to the higher layer transmission source identifier, maps the physical layer transmission source identifier to a reference signal, A user apparatus is provided that transmits the reference signal.

In addition, according to the embodiment of the present invention, there is provided a signal transmission method executed by a user apparatus that performs D2D communication wirelessly,
A signal transmission step of transmitting a signal including a physical layer transmission source identifier associated with a higher layer transmission source identifier;
In the signal transmission step, the user equipment generates a physical layer transmission source identifier by applying a hash function to the higher layer transmission source identifier, and refers to the physical layer transmission source identifier. There is provided a signal transmission method characterized by mapping to a signal and transmitting the reference signal.

  According to the embodiment of the present invention, it is possible to provide a technique that enables a user apparatus to efficiently detect a signal addressed to the user apparatus while suppressing an overhead amount in D2D communication.

1 is a configuration diagram of a system according to an embodiment of the present invention. It is a figure which shows the example of the radio | wireless resource used for D2D communication. It is a figure which shows the example of mapping of the PHY control information in this Embodiment, and upper layer header information. It is a flowchart which shows the example of reception operation | movement of the user apparatus UE. It is a figure for demonstrating the example 1 of a method which produces | generates PHY ID from upper layer ID. It is a flowchart which shows the example of receiving operation in the case of using a some hash function. It is a figure for demonstrating the example 2 of a method which produces | generates PHY ID from upper layer ID. It is a figure which shows the example of a packet structure in case upper layer ID is used as PHY ID. It is a figure which shows the packet structural example in the case of using a part of upper layer ID as PHY ID. It is a figure which shows the example 1 of mapping (with masking) to the radio | wireless resource of PHY ID. It is a figure which shows the example 2 (no masking) of mapping to the radio | wireless resource of PHY ID. It is a figure which shows the block diagram of the user apparatus UE. 3 is a configuration diagram of a baseband signal processing unit 2. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. Each embodiment described below is only an example, and embodiments to which the present invention is applied are not limited to the following embodiments. In addition, although it is assumed that the user apparatus UE and the base station eNB in this Embodiment include the function based on LTE (LTE-Advanced, or the method after LTE-Advanced is included, and so on), The communication system to which the invention can be applied is not limited to LTE, and the present invention can also be applied to other communication systems. In the following embodiments, the “upper layer” is assumed to be the “MAC layer”, but the “upper layer” may be a layer higher than the PHY layer, and is not limited to the “MAC layer”. .

(System configuration, radio resources for D2D communication)
FIG. 1 shows a system configuration example according to an embodiment of the present invention. As illustrated in FIG. 1, the communication system according to the present embodiment has a configuration in which a plurality of user apparatuses UE exist and D2D communication is performed between the user apparatuses UE. In FIG. 1, a configuration having two user apparatuses UE is shown as an example. Moreover, in this Embodiment, each user apparatus UE can also perform normal cellular communication other than D2D communication, when it exists in the coverage of the base station eNB shown in FIG.

  The user apparatus UE in this Embodiment performs D2D communication, for example using the radio | wireless resource for D2D communication allocated from the base station eNB when it exists in a coverage. Alternatively, D2D communication is performed using a predetermined radio resource for D2D communication.

  FIG. 2 shows an example of radio resources used for D2D communication in this embodiment. The radio resource may be referred to as a D2D resource pool. As shown in FIG. 2, it is possible to adopt a configuration in which a control information area (header area) and a data area are defined as radio resources used in D2D communication, and radio resources orthogonal to the control information and data are allocated. . Also, radio resource allocation may be performed without distinguishing the control information area and the data area.

  In addition, although “control information” is generally data, when “control information” and “data” are used separately, “data” is information that the user apparatus UE desires to transmit / receive (for example, The “control information” is information necessary for receiving “data”, for example. “Control information” may be called a header, and “data” may be called a payload. Further, “control information” and “data” may be collectively referred to as “signal”.

  Further, as shown in FIG. 2, the radio resource used for D2D communication does not have to be a resource block in which REs (resource elements) having a predetermined length in the time direction and the frequency direction are continuous. It may be a radio resource allocated such that frames or subcarriers are distributed.

  As radio resources for D2D communication, data channel resources defined for cellular communication can be used. The data channel is, for example, a data channel used in LTE PUSCH, PDSCH, and 5G.

(Signal transmission / reception methods, etc.)
Next, a signal transmission method / reception method in the present embodiment will be described. FIG. 3 is a diagram illustrating an example of mapping of PHY control information and PHY data to D2D communication radio resources according to the present embodiment.

  In the example shown in FIG. 3, PHY control information is mapped to a predetermined header area, and PHY data is mapped to a data area. That is, the bit field transmitted as the PHY header area maps PHY control information in accordance with a predefined format.

  In the example shown in FIG. 3, the PHY control information includes a PHY ID. As will be described in detail later, the PHY ID may be all or part of the upper layer ID. The PHY ID may be an ID generated from a higher layer ID by a hash function or the like.

  In this embodiment, PHY control information and PHY data are independently encoded, and the number of REs (resource elements) used for the PHY control information, the location of the RE, and the like are determined in advance. There may be multiple candidates for these. Further, MCS (modulation / coding scheme) for transmitting PHY control information is also determined in advance.

  The PHY data may be a variable RE number or a fixed RE number. The PHY data scheduling information (time, frequency, spreading code, etc.) can be notified using PHY control information in the header area, resource position in the header area, or a combination thereof.

  With the above mapping configuration, the user apparatus UE first receives the PHY control information addressed to itself by performing a blind search or the like within a predetermined range, and reads the PHY data addressed to itself. Therefore, reception can be performed without increasing power consumption.

  Further, by using the PHY ID as all or a part of the upper layer ID, it is not necessary to transmit all IDs independently between the PHY and the upper layer, thereby reducing overhead.

  With reference to the flowchart of FIG. 4, the example of reception operation | movement of the user apparatus UE in the case of employ | adopting the mapping structure of the above PHY control information and PHY data is demonstrated. The user apparatus UE receives the radio signal in the header area, confirms whether or not its own PHY ID exists in the PHY control information, and when the own PHY ID exists, the PHY control information is addressed to itself. It is determined that there is (step 1).

  The user apparatus UE confirms the PHY data reception method (resource, MCS, etc.) addressed to itself by confirming the contents of the PHY control information addressed to itself, and receives (demodulates and decodes) the PHY data according to the reception method. (Step 2). For example, the user apparatus UE extracts the upper layer ID from the PHY ID (eg, part of the upper layer ID) and the “part of the upper layer ID” extracted from the PHY data (step 3), and is addressed to itself. An upper layer packet is detected (step 4).

(PHY ID generation method 1 from upper layer ID)
As described above, in the present embodiment, the user apparatus UE may generate a PHY ID from the higher layer ID. In the present embodiment, there are generation methods 1 and 2 as PHY ID generation methods from higher layer IDs. First, generation method 1 will be described. The generation method 1 and the generation method 2 can be used in combination.

  In the generation method 1, for example, as shown in FIG. 5, the function f (x) is applied to the upper layer ID to generate the PHY ID. In the example of FIG. 5, the PHY ID is generated as data having a bit length shorter than the bit length of the upper layer ID.

  A hash function can be used as f (x), but f (x) is not limited to a hash function. y = x may be used as f (x). In this case, the upper layer ID is used as it is as the PHY ID.

  When the PHY ID is shorter than the upper layer ID, a collision between the PHY IDs may occur. In consideration of this, a plurality of f (x) may be defined and the user apparatus UE may arbitrarily select the f (x). For example, the user apparatus UE transmits PHY data using the PHY ID calculated by using f (x) from the upper layer ID of the destination, but the PHY ID collision is caused by the fact that the transmission is not successful. When it is detected, another phy ID is calculated using another f (x). Thereby, the collision of PHY ID between the user apparatuses UE can be avoided. Note that defining a plurality of f (x) is an example, and only one f (x) may be defined.

  When a plurality of f (x) are defined, each user apparatus UE holds these f (x). FIG. 6 is a diagram illustrating an operation example when the receiving-side user apparatus UE receives PHY data addressed to itself when a plurality of f (x) are defined.

  First, the user apparatus UE generates a PHY ID from its own upper layer ID using a certain f (x) of a plurality of f (x) (step 11). The user apparatus UE performs an operation of receiving PHY data addressed to itself using the PHY ID. When PHY data cannot be received (No in Step 12), the next f (x) is used (Step 13), and the operation from Step 11 is repeated. If PHY data can be received (Yes in step 12), the upper layer data addressed to itself is detected (received) using the upper layer ID (step 14).

  When a plurality of f (x) are defined, a part or all of the upper layer ID is associated with a specific f (x) so that the PHY ID is transmitted. Part or all can be notified implicitly. In the reception operation in this case, the information of f (x) used when the reception of the PHY data is successful is used as a part of the reception upper layer ID.

(PHY ID generation method 2 from higher layer ID)
Next, PHY ID generation method 2 (hereinafter referred to as generation method 2) from the upper layer ID will be described. In the generation method 1, the hash function is used for the entire upper layer ID. However, in the generation method 2, the upper layer ID is segmented, and a different conversion method (hash function or the like) is used for each segment of the segmented upper layer ID. PHY ID is generated by using.

  For example, if the upper layer ID includes a region code, the bit area of the region code is used as a segment, and the segment is omitted (deleted) or shortened when generating a PHY ID from the upper layer ID. Since there is a low probability that user apparatuses UE having higher layer IDs of different region codes are mixed in the same region that is within the range of D2D communication, even if the PHY ID is generated by omitting or shortening the segment, a collision occurs. Unlikely.

  The above-described region code is an example, and other than the region code, a segment of information that is common among the user apparatuses UE or has a small difference within the range of D2D communication can be preferentially omitted or shortened. Even if such a segment is omitted or shortened, the possibility of a collision is low.

  Moreover, you may give the information which is not in upper layer ID to PHY ID. Providing a plurality of f (x) in the generation method 1 is an example of providing information that is not included in the upper layer ID. The additional information may be selected autonomously by the user apparatus UE, or the base station eNB may notify the additional information by higher layer signaling (for example, RRC signaling).

  Similar to the case of multiple f (x) described above, a plurality of types of additional information are defined, and a certain user apparatus UE adds certain additional information to a value generated from an upper layer ID. Although the PHY control information is transmitted using the PHY ID, when a collision of the PHY ID is detected, an operation of generating the PHY ID using another additional information is performed. Thereby, the collision of PHY ID between the user apparatuses UE can be avoided. Similarly to the case of f (x), the reception side also generates a PHY ID using a plurality of types of additional information one by one and performs a reception operation. Further, as in the case of a plurality of f (x), the additional information applied when the reception is successful can be used as all or part of the upper layer ID.

  FIG. 7 shows an example of the generation method 2. As shown in FIG. 7, for example, the upper layer ID is segmented into segments A and B. The segment A is, for example, the region code described above, and the segment A is shortened when the PHY ID is generated. In the example of FIG. 7, the segment C is added to the information (segment A ′ + segment B ′) generated from the higher layer ID as the additional information described above.

<Method for defining upper layer ID>
Here, a method for defining an upper layer ID will be described. In the present embodiment, the definition method of the upper layer ID is not limited to a specific method. For example, as described above, the bit space used for the upper layer ID can be defined by being divided into a plurality of segments.

  Segment division is based on, for example, region (country, etc.), vendor, global / private, broadcast / multicast / unicast, coverage, operator, band, other arbitrary ID, etc., for example, source, destination, communication group, etc. It can be carried out. By not making it possible to arbitrarily set the entire upper layer ID, ID collision can be avoided.

  Also, by defining a segment so that the bit distance from other IDs becomes larger for more important applications, it is possible to avoid false alarm. For example, by assigning Public safety: 000, Commercial: 111, Public non-safety: 101, Private human type: 110, and Private machine type: 011 to a 3-bit field, Public and others with high importance are assigned. The ID can always be separated by 2 bits or more.

(About upper layer ID and PHY ID)
In the present embodiment, the transmitting-side user apparatus UE may transmit all of the upper layer ID as PHY data separately from the PHY ID, or all of the upper layer ID may be common to the PHY ID. Thus, only the PHY ID may be generated and transmitted, and the higher layer ID may not be transmitted. Alternatively, a part of the upper layer ID may be shared with the PHY ID, the PHY ID may be generated, and the part of the PHY ID and the upper layer ID may be transmitted.

  With reference to FIG. 8, a description will be given of an example of packet transmission / reception when all the upper layer IDs are PHY IDs (that is, PHY IDs are also used as upper layer IDs).

  On the transmission side in FIG. 8, the user apparatus UE transmits a PHY packet including PHY control information having a destination PHY ID and a PHY payload. In this example, since the PHY ID is also used as the upper layer ID, the upper layer packet is transmitted without including the upper layer ID in the header of the upper layer packet.

  When the user apparatus UE on the receiving side detects its own PHY ID during signal reception, it passes the PHY ID as an upper layer ID to the processing unit of the upper layer. Then, the upper layer processing unit determines that the upper layer ID of the received upper layer packet is the above PHY ID (= own upper layer ID), and the upper layer packet is a packet addressed to itself. to decide. That is, the upper layer packet is reconfigured by using the PHY ID of the PHY control information that is not used in the upper layer reception process.

  With reference to FIG. 9, a packet transmission / reception operation example when a part of the upper layer ID is a PHY ID (that is, the PHY ID is also used as a part of the upper layer ID) will be described. In the example of FIG. 9, it is assumed that the upper layer ID is “A + B”, and that “A” of these is the PHY ID.

  On the transmission side in FIG. 9, the user apparatus UE transmits a PHY packet including PHY control information having a destination PHY ID (A) and a PHY payload. In this example, since the PHY ID (A) is also used as a part of the upper layer ID, an upper layer packet including B of the upper layer ID composed of A + B is transmitted in the header of the upper layer packet.

  When the user apparatus UE on the receiving side detects its own PHY ID during signal reception, it passes the PHY ID (A) as a part of the upper layer ID to the processing unit of the upper layer. Then, the processing unit of the upper layer detects the upper layer ID from this “A” and the received “B”, and determines that the upper layer packet addressed to itself has been received.

  The packet filtering header reconfiguration based on the subset of the upper layer ID in the lower layer as described above can be applied to the case where a layer other than PHY is used as the lower layer.

(Example 1 of PHY ID mapping method)
In the present embodiment, the method in which the user apparatus UE includes the destination PHY ID in the PHY control information is not limited to a specific method. By masking, it is possible to transmit PHY ID as a part of PHY control information. That is, for example, as shown in FIG. 10, the PHY control information includes control information and a CRC of the control information, but the CRC is subjected to XOR of the PHY ID. The user apparatus UE on the receiving side acquires CRC using its own PHY ID, and can receive PHY data addressed to itself when it passes the CRC check. Further, as shown in FIG. 11, masking may not be performed by adding PHY ID as PHY control information. However, overhead can be reduced by masking with CRC as shown in FIG.

(Example 2 of PHY ID mapping method)
In the examples described so far, the PHY ID is mapped to some resources of the data channel (eg, PUSCH), but the PHY ID may be mapped to a reference signal (Reference signal) and transmitted. Good. Alternatively, a PHY ID may be mapped to a D2D synchronization signal or a Discovery signal (discovery signal) and transmitted. This reduces the overhead required for PHY ID. In the following description, a reference signal is taken as an example, but the present invention can be similarly applied to a synchronization signal and a discovery signal.

  The method of mapping the PHY ID to the reference signal is not limited to a specific method. For example, the sequence of the reference signal is associated with the PHY ID (all or a part), the sequence is transmitted, and the sequence is Is received, it is identified that the PHY ID associated with the sequence has been received. Further, for example, the position of the radio resource used for transmitting the reference signal is associated with the PHY ID (all or a part), the reference signal is transmitted, and the reception side receives the reference signal using the radio resource that has received the reference signal. Identified PHY ID.

  As a specific example, by using a reference signal similar to DM-RS, for example, the PHY ID or a part thereof can be notified implicitly by the Zadoff-Chu sequence to be used, its cyclic shift, and OCC.

  That is, in DM-RS, 8-bit information for identifying a cell can be notified by sequence grouping, hopping (group hopping, sequence hopping), etc., but such an information notification method can be used for PHY ID notification in D2D communication. Can be used.

  Also, by selecting 8 (3 bit) Cyclic shift (Rel. 8) or 8 Cyclic shift and OCC combination (Rel. 10), all or part of the PHY ID can be notified. Then, by combining with the information transmission in the above series, it is possible to notify a PHY ID of 3 bits to 11 bits.

  Further, as a specific example of mapping PHY IDs to radio resources, a plurality of RE mapping patterns of reference signals are defined, and the user apparatus UE selects a mapping pattern based on PHY ID, so that all of PHY IDs or A part can be notified. Further, a larger number of bit strings can be notified by combining the above-described series, cyclic shift, OCC, and the like with the RE mapping pattern. Further, the antenna port of the reference signal may be selected based on the PHY ID.

  Although various ID generation methods and mapping methods have been described so far, an ID generation method / mapping method when transmitting a signal in a user apparatus UE is an ID generation method / It need not be the same as the mapping method. For example, when transmitting a signal, PHY ID may be mapped to a reference signal and transmitted, and when receiving a signal, an operation of detecting PHY ID from PHY control information may be performed.

  In the above description, the generation and mapping of the destination PHY ID have been described. However, the generation and mapping of the transmission source PHY ID can be performed similarly to the generation and mapping of the destination PHY ID. .

(Configuration example of user apparatus UE)
In FIG. 12, the block diagram of the user apparatus UE which concerns on embodiment of this invention is shown. As illustrated in FIG. 12, the user apparatus UE according to the present embodiment includes an application unit 1, a baseband signal processing unit 2, a transmission / reception unit 3, an amplifier unit 4, and a transmission / reception antenna 5. The user apparatus UE in the present embodiment is a user apparatus UE that can operate in compliance with LTE, and can transmit and receive with a plurality of antennas. However, this is an example, and the present invention has one antenna. It is applicable also to the user apparatus UE which is.

  The application unit 1 is a functional unit corresponding to an application that performs voice communication and data communication between users using, for example, D2D communication. The baseband signal processing unit 2 generates and acquires various signals / data. The transmission / reception unit 3 performs modulation / demodulation of a carrier wave. The amplifier unit 4 amplifies signals, and the transmission / reception antenna 5 transmits / receives radio waves. Since the processing according to the present embodiment is performed in the baseband signal processing unit 2, the baseband signal processing unit 2 will be described in more detail.

  FIG. 13 shows a configuration diagram of the baseband signal processing unit 2. As illustrated in FIG. 13, the baseband signal processing unit 2 includes a PHY ID generation unit 201, a control unit 202, a reference signal / synchronization signal / Discovery signal generation unit 203, a transmission control information generation unit 204, a transmission data generation unit 205, A mapping unit 206, a demapping unit 207, a channel estimation unit 208, a reception control information decoding unit 209, a reception data decoding unit 210, an ID determination unit 211, and a determination unit 212 are provided. An operation example of the baseband signal processing unit 2 will be described below.

  In the baseband signal processing unit 2, for example, the ID of the higher layer is passed from the application unit 1 to the PHY ID generation unit 201. The PHY ID generation unit 201 generates a PHY ID from all or a part of the upper layer ID by the method described so far. The control unit 202 inserts the PHY ID generated by the PHY ID generation unit 201 into each physical channel. That is, as described above, when the PHY ID is transmitted using the data channel resource, the control unit 202 passes the PHY ID to the transmission control information generation unit 204, and the transmission control information generation unit 204 adds the PHY ID to the PHY control information. (Example: FIG. 10, FIG. 11, etc.). When mapping the PHY ID to a reference signal, a synchronization signal, a Discovery signal, etc., the control unit 202 passes the PHY ID to the reference signal / synchronization signal / Discovery signal generation unit 203 to generate a reference signal / synchronization signal / Discovery signal. The unit 203 generates a reference signal of a sequence corresponding to, for example, PHY ID and its mapping. The PHY ID may be transmitted using a reference signal, a synchronization signal, a Discovery signal, or the like, and may be transmitted using PHY control information.

  The transmission data generation unit 205 generates transmission data for mapping based on the transmission data received from the application unit 1.

  Information (eg, a bit string) generated by the reference signal / synchronization signal / Discovery signal generation unit 203, transmission control information generation unit 204, transmission data generation unit 205, and the like is mapped to a radio resource by the mapping unit 206. Information mapped to the radio resource is transmitted using the radio resource by the transmission / reception unit 3, the amplifier unit 4, and the transmission / reception antenna 5.

  In the reception operation, the demapping 207 acquires a signal from each radio resource. The channel estimation unit 208 performs channel estimation based on the reference signal. The channel estimation result is passed to the ID determination unit 211, the reception control information decoding unit 209, and the reception data decoding unit 210.

  The reception control information decoding unit 209 obtains control information from the signal demapped by the demapping unit 207 and also has a function of obtaining control information from the synchronization signal / Discovery signal. The reception data decoding unit 210 acquires received data (payload).

  For example, the ID determination unit 209 determines whether or not it has received its own PHY ID through the sequence of the received reference signal and its mapping and its control channel (PHY control information), and has received its own PHY ID. If it is determined, the ID determination result (result of receiving PHY ID, etc.) is once returned to the reception control information decoding unit 209 in order to filter the control information / data to be received by the user apparatus UE. The reception control information decoding unit 209 that has received the ID determination result acquires control information addressed to itself, passes the control information to the reception data decoding unit 210, and the reception data decoding unit 210 receives the information according to the control information. The acquired data is acquired.

  The ID determination unit 211 determines whether or not a PHY ID has been received. As described above, since the PHY ID may be all or a part of the upper layer ID, the ID determination unit determines the PHY ID. Not only that, the upper layer ID may be determined. For example, when the PHY ID is the same as the upper layer ID, the ID determination unit 211 detects that the upper layer ID addressed to itself is detected by detecting the PHY ID addressed to itself, and the ID determination result (self (The reception of the upper layer ID addressed) may be passed to the processing unit (the application unit 1 in this example) that performs processing of the upper layer. The determination unit 212 determines ACK / NACK and instructs the control unit 202 to retransmit a signal, for example.

  In addition, the structure of the user apparatus UE shown to FIG. 12, FIG. 13 is only an example. For example, the user apparatus UE is a user apparatus that performs D2D communication by radio, and transmits a signal including a physical layer destination identifier associated with an upper layer destination identifier that is a higher layer than the physical layer. And a signal receiving unit for detecting a signal addressed to the user apparatus by detecting an identifier of a physical layer of the user apparatus associated with an identifier of an upper layer of the user apparatus from a signal received by radio You may comprise as a user apparatus provided with these.

  Thus, the amount of overhead can be suppressed by transmitting and receiving the identifier of the physical layer associated with the identifier of the higher layer. Further, since the user apparatus can immediately identify whether the signal is addressed to the user apparatus by the received physical layer identifier, the user apparatus can efficiently receive the signal. In this embodiment, the identifier of the upper layer may not be associated with the identifier of the physical layer. That is, the identifier of the physical layer may be set independently regardless of the identifier of the upper layer.

  The physical layer destination identifier included in the signal transmitted by the signal transmission means includes, for example, all or a part of the upper layer destination identifier. With such a configuration, it is possible to suppress overhead associated with identifier transmission / reception. The signal transmitting means may generate the physical layer destination identifier from the higher layer destination identifier. For example, the signal transmission unit generates a physical layer destination identifier by applying a hash function to the higher layer destination identifier. Further, for example, the signal transmission unit can generate the physical layer destination identifier by omitting or shortening a specific segment in the higher layer destination identifier. With such a configuration, an identifier with a small amount of information can be generated while preventing collisions as much as possible.

  The signal transmission means may map the physical layer destination identifier to a predetermined control information area in a radio resource, and transmit control information including the identifier as the signal. With this configuration, when control information addressed to itself is detected, the receiving side can efficiently receive data addressed to itself using the control information.

  The signal transmission means may map the physical layer destination identifier to a reference signal, a synchronization signal, or a discovery signal, and transmit the reference signal, the synchronization signal, or the discovery signal as the signal. Good. With such a configuration, overhead can be reduced and a signal addressed to itself can be efficiently detected.

  The signal receiving means detects the upper layer data addressed to the user apparatus by using the physical layer identifier of the user apparatus as all or part of the identifier of the upper layer of the user apparatus. Also good. With this configuration, overhead can be reduced and a signal addressed to itself can be efficiently detected.

  Moreover, in this Embodiment, it is the signal transmission / reception method performed between the user apparatuses which perform D2D communication by radio | wireless, Comprising: The transmission side user apparatus is a receiving side user of the upper layer whose layer is higher than a physical layer A signal transmission step of transmitting a signal including an identifier of a receiving-side user device of a physical layer associated with the identifier of the device; and a signal of the physical layer of the receiving-side user device from a signal received by the receiving-side user device by radio By detecting the identifier, a signal transmission / reception method including a signal reception step of detecting a signal addressed to the reception-side user device is provided.

The following items are disclosed in the specification.
(Section 1)
A user apparatus that performs D2D communication wirelessly,
Signal transmitting means for transmitting a signal including a physical layer destination identifier associated with a higher layer destination identifier that is a higher layer than the physical layer;
Signal receiving means for detecting a signal addressed to the user apparatus by detecting an identifier of a physical layer of the user apparatus associated with an identifier of an upper layer of the user apparatus from a signal received by radio. Feature user equipment.
(Section 2)
The user apparatus according to claim 1, wherein the physical layer destination identifier included in the signal transmitted by the signal transmission unit includes information on all or part of the higher layer destination identifier. .
(Section 3)
The user apparatus according to claim 1 or 2, wherein the signal transmission unit generates the physical layer destination identifier from the higher layer destination identifier.
(Section 4)
4. The user apparatus according to claim 3, wherein the signal transmission unit generates a physical layer destination identifier by applying a hash function to the higher layer destination identifier.
(Section 5)
The signal transmission unit generates the physical layer destination identifier by omitting or shortening a specific segment in the higher layer destination identifier. User device.
(Section 6)
The signal transmission means maps the identifier of the physical layer destination to a predetermined control information area in a radio resource, and transmits control information including the identifier as the signal. The user device according to any one of the items.
(Section 7)
The signal transmission unit maps the identifier of the physical layer destination to a reference signal, a synchronization signal, or a discovery signal, and transmits the reference signal, the synchronization signal, or the discovery signal as the signal. The user device according to any one of Items 1 to 6.
(Section 8)
The signal receiving means detects upper layer data addressed to the user apparatus by using the physical layer identifier of the user apparatus as all or part of the identifier of the upper layer of the user apparatus. The user device according to any one of the first to seventh items.
(Section 9)
A signal transmission / reception method executed between user apparatuses that perform D2D communication wirelessly,
A signal transmission step in which the transmission-side user apparatus transmits a signal including the identifier of the reception-side user apparatus in the physical layer associated with the identifier of the reception-side user apparatus in the higher layer that is a layer higher than the physical layer;
A signal receiving step of detecting a signal addressed to the receiving-side user device by detecting an identifier of a physical layer of the receiving-side user device from a signal received by the receiving-side user device; Signal transmission and reception method.

  Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. Will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. For convenience of explanation, the user apparatus UE has been described using a functional block diagram, but such an apparatus may be realized by hardware, software, or a combination thereof. According to the present invention, software that is operated by a processor included in the user apparatus UE includes random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, and CD-ROM. , Database, server or any other suitable storage medium. The present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like are included in the present invention without departing from the spirit of the present invention.

UE user apparatus eNB base station 1 application unit 2 baseband signal processing unit 3 transmission / reception unit 4 amplifier unit 5 transmission / reception antenna 201 PHY ID generation unit 202 control unit 203 reference signal / synchronization signal / Discovery signal generation unit 204 transmission control information generation unit 205 Transmission data generation unit 206 Mapping unit 207 Demapping unit 208 Channel estimation unit 209 Reception control information decoding unit 210 Reception data decoding unit 211 ID determination unit 212 determination unit

Claims (4)

A user apparatus that performs D2D communication wirelessly,
Signal transmitting means for transmitting a signal including a physical layer transmission source identifier associated with an upper layer transmission source identifier;
The signal transmission means generates a physical layer transmission source identifier by applying a hash function to the higher layer transmission source identifier, maps the physical layer transmission source identifier to a reference signal, A user apparatus that transmits the reference signal. A user apparatus that performs D2D communication wirelessly,
Signal transmitting means for transmitting a signal including a physical layer identifier associated with an upper layer identifier;
The signal transmission means generates a physical layer identifier by applying a hash function to the higher layer identifier, maps the physical layer identifier to a reference signal, and transmits the reference signal. User equipment. A signal transmission method executed by a user apparatus that performs D2D communication wirelessly,
A signal transmission step of transmitting a signal including a physical layer transmission source identifier associated with a higher layer transmission source identifier;
In the signal transmission step, the user equipment generates a physical layer transmission source identifier by applying a hash function to the higher layer transmission source identifier, and refers to the physical layer transmission source identifier. A signal transmission method characterized by mapping to a signal and transmitting the reference signal. A signal transmission method executed by a user apparatus that performs D2D communication wirelessly,
A signal transmission step of transmitting a signal including an identifier of a physical layer associated with an identifier of an upper layer,
In the signal transmission step, the user apparatus generates a physical layer identifier by applying a hash function to the higher layer identifier, maps the physical layer identifier to a reference signal, and converts the reference signal to A signal transmission method characterized by transmitting.

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