JP6893294B2 - Signal transmitter and communication system - Google Patents

Description

The present invention relates to communication technology field, in particular, the signal transmission device, a及beauty communication system.

So far, 3GPP RAN has begun research on device-to-device (D2D, Device to Device) issues in LTE systems to evaluate geographically adjacent devices and services between devices in LTE. .. Operations related to D2D may include D2D Discovery and D2D Communication.

In D2D discovery, the user device selects a resource for transmitting a discovery signal from the configured resource pool. The discovery signal includes at least a discovery message and may also include discovery preamble information. According to the progress so far, D2D is performed by repeatedly (overlapping) sending a discovery message multiple times within one discovery period.
It is mentioned to improve the performance of discovery.

For example, the D2D discovery probability is obtained by repeatedly transmitting a discovery message that carries one discovery MAC (Medium Access Control) PDU (Protocol Data Unit) within one discovery cycle. Can be raised.

On the other hand, another important issue of D2D is D2D communication. According to the discussion so far, the D2D transmitting side user apparatus can also improve the communication quality by adopting a method of retransmitting the D2D broadcast data a plurality of times when transmitting the D2D broadcast data.

It should be noted that the above-mentioned introduction of the background technology is for the purpose of clearly and completely explaining the technical proposal of the present invention and making it easy for those skilled in the art to understand it. These technical proposals should not be construed as well known to those skilled in the art as they are described as part of the background art of the present invention.

When a discovery message is repeatedly transmitted in D2D discovery, the method of selecting a resource for the D2D transmitting user device to repeatedly transmit each time needs to be clarified in the standard. According to the discussion so far, the following two types of methods have been provided, that is, (1) the transmitting user device selects the first resource from the discovery resources capable of repeatedly transmitting the discovery message. The resources for randomly selecting, i.e. randomly selecting the resource for the first transmission and for the other subsequent repeated transmissions, are determined by the first resource; (2) the sending user device , Discovery resources provide two methods of randomly selecting a resource for repeated transmission each time.

However, the inventor discovered the following problems. That is, in the above method (1), if the resource for repeated transmission thereafter is determined only by the first resource, the first resources randomly selected by a plurality of D2D transmitting user devices collide with each other. At that time, the resources of the subsequent D2D discovery message to be repeatedly transmitted also collide, which cannot guarantee a relatively low collision probability between the discovery signals of a plurality of D2D user devices.

Further, in the above method (2), the randomization effect between the discovery signals of the plurality of transmitting side user devices is to some extent, but in the case of the receiving side user device, the combination of copies of the plurality of discovery signals is performed. Difficult to achieve. The reason is that the receiving user device does not know the location of the resource where the copy of each discovery signal is located, so the coupling must be performed based only on the assumption of the location of the resource that can be copied. Assuming that there are N types of resources that can transmit the discovery signal each time, when it is necessary to transmit M times repeatedly, in the worst case, N ^M
Multiple attempts can be made to accurately decode the discovery signal. This method of randomly selecting resources each time a copy of the discovery signal is transmitted significantly increases the complexity of decoding and demodulating the receiving user device, with power consumption associated with it. To increase.

Therefore, in D2D discovery, when a D2D discovery message is repeatedly transmitted continuously or discontinuously within one discovery cycle, one problem to be studied is that the D2D transmitting user device transmits a copy of the discovery signal. Resource selection problem, i.e., on the one hand, the interference when multiple D2D sender user devices transmit discovery signals needs to be randomized, and on the other hand, the reception complexity of the D2D receiver user device. Needs to be reduced. In D2D communication, there is a problem similar to the resource selection problem in D2D discovery.

Embodiments of the present invention provide signal retransmission devices, methods and communication systems. When determining the resource where the signal to be repeatedly transmitted is located, it is necessary to give due consideration to randomizing the interference between the user devices as much as possible, and to reduce the complexity of blind detection of the receiving user device as much as possible. Also need to be considered.

According to the first aspect of the embodiments of the present invention, a signal retransmission method is provided, which is used in a first user apparatus, wherein the method is:
The resource for transmitting the signal first and the resource for retransmitting the signal are determined based on the frequency hopping pattern; and the resource for retransmitting the signal to the second user apparatus is included based on the determined resource. ..

According to the second aspect of the embodiment of the present invention, a signal retransmission device is provided, which is configured as a first user device, wherein the device.
A resource determination unit that determines a resource that retransmits the signal based on a resource that first transmits a signal and a frequency hopping pattern; and a resource determination unit that determines the resource determination unit determines the resource to a second user apparatus. Includes a signal transmission unit that retransmits a signal.

According to the third aspect of the embodiment of the present invention, a signal retransmission method is provided, which is used in a second user apparatus, wherein the method is:
The resource for retransmitting the signal includes receiving the signal retransmitted by the first user device, and the resource for retransmitting the signal is determined by the first user device based on the resource for first transmitting the signal and the frequency hopping pattern. Is to be done.

According to the fourth aspect of the embodiment of the present invention, a signal retransmission device is provided, which is configured as a second user device, wherein the device.
The resource for retransmitting the signal includes a signal receiving unit for receiving the signal retransmitted by the first user apparatus, and the resource for retransmitting the signal is based on the resource for first transmitting the signal by the first user apparatus and the frequency hopping pattern. It will be confirmed.

According to a fifth aspect of an embodiment of the present invention, a communication system is provided, wherein the communication system is described.
Including first user device and second user device
The first user apparatus determines the resource for retransmitting the signal based on the resource for transmitting the signal first and the frequency hopping pattern, and retransmits the signal based on the determined resource.
The second user device receives the signal retransmitted by the first user device.

According to another aspect of the embodiments of the present invention, a computer-readable program is provided, of which, when the program is executed in the user device, the program retransmits the above-mentioned signal to the computer in the user device. Let the method run.

According to another aspect of an embodiment of the present invention, a storage medium storing a computer-readable program is provided, wherein the computer-readable program causes the computer to perform the above-mentioned signal retransmission method in a user apparatus.

A beneficial effect of the embodiments of the present invention is to randomize interference between user devices as much as possible by determining the resource that initially transmits the signal and the resource that retransmits the signal based on the frequency hopping pattern. At the same time, the complexity of blind detection of the receiving user device can be reduced as much as possible.

By referring to the description and drawings described below, a specific embodiment of the present invention will be disclosed in detail, and an embodiment in which the principle of the present invention can be adopted will be shown. It should be noted that the embodiments of the present invention are not limited thereto in terms of scope. Within the scope of the appended claims, embodiments of the present invention may include various modifications, modifications and alternatives.

Also, the features described and / or shown for one embodiment may be used in one or more other embodiments in the same or similar manner and combined with or in combination with features in other embodiments. It is also possible to replace the features in the morphology.

Note that terms such as "include / have", as used herein, refer to the presence of a feature, element, step, or assemble, but one or more other features, elements, steps, Alternatively, it also refers to not excluding the existence or addition of an assembly.

Many aspects of the invention can be better understood by reference to the drawings below. The elements in the drawings are not drawn proportionally, but only for showing the principle of the present invention. In order to conveniently explain and illustrate a part of the present invention, the corresponding part in the drawings may be enlarged or reduced.

In addition, the elements and features described in one drawing or embodiment of the present invention can be combined with the elements and features shown in one or more other drawings or embodiments. Further, in the drawings, similar reference numerals may be used to indicate the corresponding elements in some drawings and also to indicate the corresponding elements used in a plurality of embodiments.
It is a flowchart of the signal retransmission method in Example 1 of this invention. It is a figure which shows an example of the signal transmission in Example 1 of this invention. It is a flowchart of the signal retransmission method in Example 2 of this invention. It is a block diagram of the signal retransmission apparatus in Example 3 of this invention. It is a system block diagram of the user apparatus in Example 3 of this invention. It is a block diagram of the signal retransmission apparatus in Example 4 of this invention. It is a block diagram of the communication system in Example 5 of this invention.

The aforementioned and other features of the present invention will become apparent by reference to the accompanying drawings and the following description. The specification and drawings disclose specific embodiments of the invention, which indicate some embodiments in which the principles of the invention may be employed. It should be understood that the invention is not limited to the embodiments described, but also includes all modifications, modifications and alternatives that fall within the appended claims. Hereinafter, various examples of the present invention will be described with reference to the drawings. It should be noted that these examples are merely examples and do not limit the present invention.

In this embodiment, signals are transmitted or retransmitted (also referred to as repeated transmission) between two user devices, and the two user devices can perform D2D communication or D2D discovery. The present invention is not limited to this, and may be used, for example, for an operation between two user devices that do not perform a D2D operation, that is, a specific scenario may be determined according to an actual situation. good. Hereinafter, an embodiment of the present invention will be described as an example of signal retransmission only between two user devices performing D2D communication or D2D discovery.

An embodiment of the present invention provides a signal retransmission method, which is used on the first user device side as the signal transmitting side. FIG. 1 is a flowchart of a signal retransmission method according to an embodiment of the present invention.
As shown in FIG. 1, the method comprises the following steps.

Step 101: The first user apparatus determines the resource to retransmit the signal based on the resource to transmit the signal first and the frequency hopping pattern;
Step 102: The first user device retransmits the signal to the second user device based on the determined resource.

In the present embodiment, the signal may be a discovery signal at the time of D2D discovery or data at the time of D2D communication, and the present invention is not limited thereto. Further, the frequency hopping pattern may be a predetermined one, and the frequency hopping pattern may be a cell-specific or a common one. , The user device may be dedicated (UE-specific), and the present invention is not limited thereto. For example, the frequency hopping pattern may be a hopping type of PUSCH (PUSCH, Physical Uplink Shared Channel) in the conventional standard. Since related technologies can be referred to for the specific contents of frequency hopping, detailed description thereof will be omitted here.

In step 101, the frequency hopping pattern is associated with one or more factors such as the resource that initially transmits the signal, the number of the subframe where the corresponding retransmission / duplication signal resides, and Related ID information. Based on the frequency hopping pattern information, the resource for retransmitting the signal can be determined. The present invention is not limited to this, that is, factors related to the frequency hopping pattern may be determined according to the actual situation.

For example, the related ID information may be a common ID (common ID) for all user devices or an ID dedicated to the user device, for example, a cell ID, and the ID of the user device to be transmitted. Alternatively, it may be C-RNTI (Cell Radio Network Temporary Identifier) or the like. The present invention is not limited to this, that is, specific information may be determined based on an actual scenario.

In one example, in D2D communication, the resource number used for the i-th retransmission can be indicated by the following formula (1) or (2), but the present invention is not limited thereto.

Or

Of these, n (0) represents the resource number used to transmit the signal first, that is, the first (start) resource block (RB, Resource Block); n (i) is on the frequency domain of this retransmission. RB represents the first (start) position of; f (i, j) is the function related to the subframe number #j where the current retransmission is located, and f (i, j, ID) is the location of the current retransmission. Subframe number #j and ID
For example, the function is a pseudo-random sequence whose initial value is determined by an ID; N indicates the quantity of available resources in the frequency domain, that is, the quantity of RB; It is information about the ID of the user device to transmit, and the frequency hopping pattern is cell-specific or UE-specific according to the mode of the transmitting UE (for example, Mode 1 or Mode 2, which will be described in detail later). It may be in the form, i.e., each adopts an independent frequency hopping type when different modes of transmitting UEs repeatedly transmit D2D signals.

Among them, the frequency hopping type adopted by the mode 1 transmitting UE is configured in the base station (for example, eNB), and the transmitting UE includes this frequency hopping type in the SA (Scheduling Assignment) transmitted to the receiving UE. Notify the receiving UE. As a result, the transmitting UE and the receiving UE transmit and receive data, respectively, based on the same hopping type. The transmitting UE in Mode 2 voluntarily selects a frequency hopping type, and also notifies the receiving UE of the SA transmitting to the receiving UE including this frequency hopping type.

For example, when the transmitting user device adopts Mode 1, the frequency hopping pattern is cell-specific, and the ID is the ID of the service cell in which the user device is located, that is, the cell ID or D2D broadcast. It may be an ID. When the transmitting user device adopts Mode 2, the frequency hopping pattern is UE-specific, and the ID is the only ID related to the user device, for example, C-RNTI, or other user device. It may be an ID that can be labeled.

Therefore, the difference from the prior art is that in this embodiment, the interference between the user devices can be randomized as much as possible by determining the resource for retransmission based on the frequency hopping pattern, and the reception can be performed. Since the resource for retransmission can be determined on the side based on the frequency hopping pattern, the complexity of blind detection of the receiving side user device can be reduced as much as possible.

According to the discussion of D2D communication so far, from the angle of the transmitting user device, D2D is based on whether the D2D communication resource is distributed by the eNB or the UE voluntarily selects it. Communication has two modes, namely Mode 1 and Mode 2. Of these, the resources used for D2D communication of the Mode 1 transmitting user device are configured by eNB, and the resources used for the D2D communication of the Mode 2 transmitting user device are spontaneously generated by the user device. It is the one to choose.

Also, in the discussion of D2D discovery, D2D discovery is divided into two types: Type 1 D2D discovery and Type 2 D2D discovery. Type 2
D2D discovery is further divided into Type 2A and Type 2B based on the method by which eNB allocates discovery resources.

Among them, Type 1 D2D discovery means that eNB allocates one resource pool semi-statically for D2D discovery, and this resource pool is common to D2D user equipment (DUEs) (that is, common resource). Pool); Type 2A D2D discovery means that eNB dynamically allocates UE-specific discovery resources for each DUE D2D discovery; Type 2B D2D discovery means that eNB is UE-specific. Refers to the semi-static allocation of discovery resources in.

In this embodiment, the plurality of first user devices that employ different modes to perform D2D communication have different frequency hopping patterns, or the plurality of first user devices that employ different types to perform D2D discovery. For one user device, the frequency hopping pattern is different. That is, the frequency hopping patterns adopted by a plurality of transmitting UEs in different modes during D2D communication are configured independently of each other, and the frequency hopping patterns adopted when a plurality of transmitting UEs perform different types of D2D discovery are also included. , Are configured independently of each other.

In one embodiment, the transmitting user equipment that employs Mode 1 for D2D communication can receive the configuration information transmitted by the base station to configure the resources for the first transmission of the signal. The frequency hopping pattern adopted by the transmitting user device is cell-specific or common. Further, the frequency hopping type configured by the base station may be received, and then the transmitting side user device can instruct the frequency hopping type to be used by the SA transmitted to the receiving side user device.

For example, when the eNB allocates the resources of the transmission signal, the resources between the plurality of user devices can be shifted by the scheduling of the eNB, whereby the frequency hopping pattern may be cell-specific or common. .. Therefore, the eNB need only allocate the resource used to transmit the signal for the first time, and then, when the signal is transmitted multiple times by the method of repeatedly transmitting the copy or the method of retransmitting the signal, the copy is retransmitted. Resources can be hopping according to a cell-specific (or common) frequency hopping pattern based on the resource for transmitting the signal first.

In this way, the eNB can stagger the resources to initially transmit signals from different user devices, thereby based on cell-specific (or common) frequency hopping patterns when retransmitting the signals. By performing frequency hopping, it is possible to reduce the possibility of overlapping resources used for signal retransmission of a plurality of user devices.

In another embodiment, the transmitting user device that adopts Mode 2 during D2D communication can voluntarily select the configuration information of the resource that first transmits the signal, and the transmitting user device adopts it. The frequency hopping pattern to be performed is dedicated to the user device (UE-specific). In addition, the transmitting side user device voluntarily selects the frequency hopping type to be used.
Moreover, the frequency hopping type to be used can be instructed in the SA transmitted to the receiving side user device.

For example, when the UE voluntarily selects the resource of the transmission signal, frequency hopping can achieve the effect of randomizing interference between multiple user devices. The frequency hopping pattern is UE-specific, mainly because it achieves randomization of interference by randomizing the selected resources.

Here, when the resource of the transmission signal voluntarily selected by the user device is used for signal transmission, the resource for transmitting the signal first (for the first transmission) voluntarily selected by a different user device. We cannot guarantee that there will be no collisions. In such a case, the UE-specific frequency hopping pattern randomizes the resources for subsequent retransmissions (repeated transmissions of copies) even if there is a collision of resources for the first transmission of different user devices. This can reduce the probability of subsequent retransmission resource collisions.

In another embodiment, the transmitting user device adopting Type 1 during D2D discovery can voluntarily select the configuration information of the resource that first transmits the signal from the preset resource pool. .. Among them, the frequency hopping pattern is dedicated to the user equipment (UE-specific), and the frequency hopping type can be configured together when the eNB or the base station configures the resource pool.

In another embodiment, the transmitting user apparatus that employs Type 2A or Type 2B during D2D discovery receives the configuration information transmitted by the base station to configure the resource that initially transmits the signal. Can be done. Among them, the frequency hopping pattern is cell-specific or common, and the frequency hopping type can be configured together when the eNB or the base station composes the resource information.

In this embodiment, different hopping information can be adopted for different scenarios to achieve different purposes. Regarding cell-specific (common) hopping information, when all UEs repeatedly transmit signals, the resources used for signal retransmission perform hopping in the frequency region according to the common hopping pattern. With regard to UE-specific hopping information, when all users repeatedly transmit signals, the resources used for signal retransmission can perform hopping on the frequency region according to a user-specific hopping pattern.

In another embodiment, the transmitting user device that adopts Mode 1 during D2D communication has a conventional standard that the positional relationship between the resource used for signal retransmission and the resource used for initial transmission during D2D data transmission is standard. PUSCH hopping plan (or hopping type), that is, Type 1 PUSCH hopping and Type 2 PUSCH hopping can be adopted.

又は
（外２）

という３つの値のうちの１つであっても良い。そのうち、
（外３）

は、従来の標準に定義されている
（外４）

（該値は、セルラーユーザが上りリンクデータを送信してPUSCH hoppingを行う時のPUSCHのリソースブロックの数量を表す）と異なり、
（外５）

は、D2D通信中でD2Dユーザ装置がD2Dデータを送信する時のPUSCHのリソースブロックの数量を表し、該値は、予め構成されたリソースプールの大小（サイズ）であっても良い。 Specifically, when adopting the Type 1 PUSCH hopping type, the value of 1-bit or 2-bit hopping information NUL_hop in the downlink control information (DCI, Downlink Control Information) for D2D communication transmitted by eNB and The size of the 1-bit or 2-bit hopping information NUL_hop in the DCI for D2D communication and the size of the resource pool preconfigured for the D2D communication according to the size of the system bandwidth or transmitted by the eNB. According to size)
The hopping offset that the transmitting user device performs frequency domain hopping is
(Outside 1)

Or (outside 2)

It may be one of the three values. Of which
(Outside 3)

Is defined in the conventional standard (outside 4)

(The value represents the number of PUSCH resource blocks when a cellular user sends uplink data and performs PUSCH hopping).
(Outside 5)

Represents the number of PUSCH resource blocks when the D2D user device transmits D2D data during D2D communication, and the value may be the size of a preconfigured resource pool.

Among them, when allocating a resource for a transmitting user device, the eNB can indicate a hopping type for the transmitting user device to retransmit or repeatedly transmit data by signaling. The transmitting user device can further transmit the hopping type to the receiving user device, for example, by SA (Scheduling Assignment) information.

When adopting a method such as Type 2 PUSCH hopping, the resources used for subsequent retransmissions are jointly determined by the resources used for initial transmission and a predefined frequency hopping strategy (cell-specific or common). To. The ID at this time may be cell ID or D2D broadcast ID information. When adopting a method such as Type 1 PUSCH hopping, the resources used for subsequent retransmission of the sending user device are obtained from the scheduling information (scheduling grant) sent by the eNB to the sending user device, and are received. After receiving the SA information transmitted by the transmitting user device, the side user device acquires the resource used by the transmitting user device to transmit the retransmission data from the SA information.

In the other embodiment, when the transmitting user device that adopts Mode 2 during D2D communication transmits D2D data, the positional relationship between the resource used for signal retransmission and the resource used for initial transmission is the conventional standard. Type 2 PUSCH hopping inside may be adopted. In this embodiment, the resource used for the subsequent retransmission is jointly determined by the resource used for the initial transmission and one frequency hopping pattern randomly selected from the preset frequency hopping pattern collection. Among them, the resource used for the initial transmission and the selected hopping pattern may be indicated in the SA information. Further, the resource used for the subsequent retransmission is jointly determined by the resource used for the initial transmission and the frequency hopping pattern dedicated to the user. Among them, the resource used for the initial transmission and the UE-specific ID information that determines the UE-specific hopping plan may be specified in the SA information.

FIG. 2 is a diagram showing an example of signal transmission in the embodiment of the present invention. As shown in FIG. 2, the resource selected when the signal is first transmitted is # 1, and when the signal is subsequently retransmitted, it is based on the resource that transmits the signal first and the frequency hopping pattern. , Resource selection can be done.

In this embodiment, the receiving side user device can grasp the frequency hopping pattern in advance. Based on the frequency hopping pattern, the resource where the retransmission signal is located can be determined, which can reduce the complexity of blind detection of the receiving user apparatus as much as possible.

Specifically, the first user device transmits instruction information for determining the retransmission resource to the second user device, and the second user device transmits the retransmitted signal based on the instruction information. Can be received. Among them, the instruction information for determining the resource for retransmission is the position information of the resource for transmitting the signal first, the indicator (ID) information regarding the user device for transmitting the signal, and the subframe for retransmitting the signal. Includes location information for. The present invention is not limited to this, and for example, by defining some related information in advance, the receiving user device can also perform blind detection based on these predefined information. ..

In one embodiment, when the first user device and the second user device perform D2D communication, the instruction information for determining the resource for retransmission may be carried in the SA.

Specifically, during D2D communication, the SA can be transmitted before the D2D data is transmitted, and the content of the SA includes some scheduling information of the D2D data. The SA may include information indicating the resource position used for the initial transmission of the D2D data, information on the transmitting user device, and subframe position information for transmitting the D2D data a plurality of times. By designing one common rule known to the transmitting side and the receiving side (that is, a frequency hopping plan), the relationship between the resource used for the initial transmission and the resource used for the subsequent transmission can be established. This allows the D2D receiver user device to know the resource location for the first D2D data transmission by demodulating the SA, and based on formula (1) or (2). , Subsequent signal retransmissions / overlapping resource locations can be calculated.

In another embodiment, when the first user device and the second user device perform D2D discovery, the instruction information for determining the resource for retransmission may be carried in the discovery preamble.

Specifically, unlike D2D communication, for D2D discovery, SA transmission does not currently indicate the resource location of the D2D discovery message. However, with D2D discovery, a discovery preamble can be sent before the D2D discovery message is sent, which can help demodulate the discovery message. By demodulating the Discovery preamble, information about the sender user device ID can be known, which may be used to carry the UE-specific scrambling information of the PUSCH signal of the discovery message transmission.

In D2D discovery, when one discovery message occupies m (fixed quantity) PRBs and the configured resource pool contains M PRBs in the frequency domain, a total of N = M / m resource units. There is information. At this time, n (i) in the formula (1) or (2) can represent the RB start position on the frequency domain of the current retransmission, or can represent the number of the frequency domain resource unit. ..

As can be seen from the above embodiment, if it is only possible to randomize the interference between the user devices as much as possible by determining the resource for signal retransmission based on the resource for transmitting the signal first and the frequency hopping pattern. However, the complexity of blind detection of the receiving user device can be reduced as much as possible.

An embodiment of the present invention provides a signal retransmission method, which is used in a second user apparatus as a signal receiving side, and the same description as in the first embodiment is omitted. FIG. 3 is a flowchart of the signal retransmission method in the embodiment of the present invention. As shown in FIG. 3, the method comprises the following steps.

Step 301: The second user apparatus receives the signal retransmitted by the first user apparatus; among them, the resource for retransmitting the signal is the resource for which the first user apparatus first transmits the signal, and frequency hopping. It was confirmed based on the pattern.

As shown in FIG. 3, the method may further include the following steps, i.e.
Step 302: The second user device performs a reception / coupling process on the received signal.
As for how to specifically perform the coupling, any related method of the prior art may be adopted, and thus detailed description thereof will be omitted here.

In this embodiment, the second user apparatus can receive the instruction information for determining the retransmission resource transmitted by the first user apparatus. As a result, the second user device can receive the retransmitted signal based on the instruction information. Among them, the instruction information for determining the resource for retransmission includes the position information of the resource that first transmits the signal, the indicator information regarding the user device that transmits the signal, and the position information of the subframe that transmits the signal. But it's okay. The present invention is not limited to this, and for example, the second user device can further receive the signal by blind detection.

In one embodiment, when the first user device and the second user device perform D2D communication, the instruction information for determining the resource for retransmission may be carried in the SA.

In another embodiment, when the first user device and the second user device perform D2D discovery, the instruction information for determining the resource for retransmission may be carried in the discovery premable information. After obtaining the instruction information, the user device is described, for example, in the formula (1).
) Or (2) can be used to determine the location of the resource where the retransmitted signal is located.

For example, the second user device blindly detects the discovery preamble in all possible subframes, and if it can detect it accurately, then according to formula (1) or (2), for example, the retransmission / overlapping frequency of the subsequent discovery message. Get the position on the domain and receive
A combination (eg, soft merger) can be performed. Among them, the ID information in the formula (1) or (2) can be obtained from the discovery preamble.

In another embodiment, the discovery preamble does not exist when the first and second user devices perform D2D discovery. The second user device performs blind detection at the subframe position of all possible initial transmission D2D discovery messages.
By detecting the Demodulation Reference Signal (DMRS) sequence, it is determined whether the transmitted message exists, and the position of the initial transmission D2D discovery message on the frequency domain is determined, that is, The n (0) of formula (1) or (2) can be determined. Based on this assumption, the retransmission / duplication of subsequent D2D discovery messages can be demodulated and received / combined, and such processing can be repeated until the D2D discovery message can be accurately modulated. .. Among them, the ID information in the formula (1) or (2) can be obtained from the DMRS sequence of the D2D discovery message of the initial transmission, or the predefined ID information (for example, a plurality of IDs are defined in advance). Is also good).

As can be seen from the above embodiment, by determining the resource for transmitting the signal first and the resource for the retransmission signal based on the frequency hopping pattern, it is possible not only to randomize the interference between the user devices as much as possible, but also to make it as random as possible. The complexity of blind detection on the receiving user device can also be reduced as much as possible.

An embodiment of the present invention provides a signal retransmission device, which is configured as a first user device. The embodiment of the present invention corresponds to the signal retransmission method of the first embodiment, and the description of the same content is omitted.

FIG. 4 is a configuration diagram of a signal retransmission device according to an embodiment of the present invention. As shown in FIG. 4, the signal retransmission device 400 includes a resource determination unit 401 and a signal transmission unit 402. Of which
The resource determination unit 401 determines the resource for retransmitting the signal based on the resource for which the signal is first transmitted and the frequency hopping pattern, and the signal transmission unit 402 determines the resource for which the resource determination unit 401 has determined. The signal is retransmitted to the second user device.

In this embodiment, the plurality of first user devices that employ different modes to perform D2D communication have different frequency hopping patterns, or the plurality of said first user devices that employ different types to perform D2D discovery. In the first user device, the frequency hopping pattern is also different. The frequency hopping pattern may be dedicated to the cell or may be dedicated to the user device.

In one embodiment, as shown in FIG. 4, the signal retransmission device 400 may further include a configuration receiving unit 403, which is a base when the first user device and the second user device perform D2D communication. When the station receives the configuration information transmitted by the station to configure the resource for transmitting the signal first, or when the first user device and the second user device perform D2D discovery, the base station is semi-static or semi-static. Receives dynamically transmitted configuration information to configure the resource that first transmits the signal.

In another embodiment, the resource determination unit 401 further randomly selects the resource to transmit the signal first when the first user device and the second user device perform D2D communication, or the first user device. When the user device and the second user device perform D2D discovery, a resource for first transmitting a signal is randomly selected from a predetermined resource pool.

In another embodiment, the frequency hopping pattern may be PUSCH hopping type information.

In another embodiment, as shown in FIG. 4, the signal retransmission device 400 may further include an information transmission unit 404, which transmits instruction information for determining the retransmission resource to the second user device. As a result, the second user device can receive the signal of retransmission based on the instruction information.

Among them, the instruction information for determining the resource for retransmission includes the position information of the resource that first transmits the signal, the indicator information regarding the user device that transmits the signal, and the position information of the subframe that transmits the signal. good. The present invention is not limited to this.

In this embodiment, when the first user device and the second user device perform D2D communication, the instruction information for determining the resource for retransmission may be carried in the scheduling allocation information, or the first user. When the device and the second user device perform D2D discovery, the instruction information for determining the resource for retransmission may be carried in the discovery premable information.

The embodiments of the present invention further provide a user device, which includes the signal retransmission device 400 described above.

FIG. 5 is a system configuration diagram of the user device 500 according to the embodiment of the present invention. As shown in FIG. 5, the user device 500 may include a central processing unit 100 and a storage device 140, which is coupled to the central processing unit 100. It should be noted that the figure is merely an example, and a telecommunications function or another function can be realized by supplementing or substituting the structure using another type of structure.

In one embodiment, the function of the signal retransmission device 400 can be integrated into the central processing unit 100. Among them, the central processing unit 100 may be configured to realize the signal retransmission method described in the first embodiment.

In another embodiment, the signal retransmission device 400 may be configured separately from the central processing unit 100, for example, the signal retransmission device 400 may be configured as a chip connected to the central processing unit 100 for central processing. The function of the signal retransmission device 400 can be realized by controlling the device.

As shown in FIG. 5, the user device 500 may further include a communication module 110, an input unit 120, a voice processing unit 130, a display 160, and a power supply 170. The user device 500 does not necessarily have to include all the parts shown in FIG. In addition, the user device 500 is further shown in FIG.
Other components not shown in may be included, for which prior art can be referred to.

As shown in FIG. 5, the central processing unit 100 may also be referred to as a controller or operation controller and may include a microprocessor or other processing unit sum / or logic device, the central processing unit 100 being an input. Can be received to control the operation of each component of the user device 500.

Among them, the storage 140 may be, for example, one or more of a buffer, a fresh memory, an HDD, a mobile medium, a volatile storage, a non-volatile storage or other suitable device, as described above. It is possible to memorize information such as, and it is also possible to memorize a program for information processing. The central processing unit 100 can realize storage or processing of information by executing the program stored in the storage device 140. Since the functions of the other parts are similar to those of the conventional ones, detailed description thereof will be omitted here. Further, each component of the user device 500 can be realized by dedicated hardware, firmware, software or a combination thereof, all of which belong to the scope of the present invention.

As can be seen from the above embodiment, by determining the resource of the retransmission signal based on the resource for transmitting the signal first and the frequency hopping pattern, the interference between the user devices can be randomized as much as possible, and the receiving side can be randomized. The complexity of blind detection on the user device can also be reduced as much as possible.

An embodiment of the present invention provides a signal retransmission device, which is configured as a second user device. The embodiment of the present invention corresponds to the signal retransmission method of the second embodiment, and the description of the same content is omitted.

FIG. 6 is a configuration diagram of a signal retransmission device according to an embodiment of the present invention. As shown in FIG. 6, the signal retransmission device 600 includes a signal receiving unit 601 which receives a signal retransmitted by the first user device, of which the resource for retransmitting the signal is a signal from the first user device. Is determined based on the resource to be transmitted first and the frequency hopping pattern.

As shown in FIG. 6, the signal retransmission device 600 may further include a signal processing unit 602.
It performs reception / coupling processing on the received signal.

In one embodiment, as shown in FIG. 6, the signal retransmission device 600 may further include an information receiving unit 603, which is instructional information transmitted by the first user device for determining a retransmission resource. The signal receiving unit can receive the retransmitted signal based on the instruction information.

Among them, the instruction information for determining the resource for retransmission includes the position information of the resource that first transmits the signal, the indicator information regarding the user device that transmits the signal, and the position information of the subframe that transmits the signal. .. The present invention is not limited to this.

In this embodiment, when the first user device and the second user device perform D2D communication, the instruction information for determining the resource for retransmission is carried in the scheduling distribution information, or the first user device and the first user device and the first user device. When the two-user device performs D2D discovery, the instruction information for determining the resource for retransmission is carried in the discovery premable information.

In another embodiment, the signal receiving unit 601 acquires the position information of the resource where the signal is located by detecting the DMRS sequence, and based on the position information, retransmits the signal. Receive.

An embodiment of the present invention further provides a user device, which includes the signal retransmission device 600 described above.
FIG. 5 can be referred to for the configuration relating to the user device.

As can be seen from the above embodiment, by determining the resource for transmitting the signal first and the resource for the retransmission signal based on the frequency hopping pattern, it is possible not only to randomize the interference between the user devices as much as possible, but also to make it as random as possible. The complexity of blind detection on the receiving user device can also be reduced as much as possible.

The embodiment of the present invention provides a communication system, and the description of the same contents as those of the first to fourth embodiments is omitted.

FIG. 7 is a configuration diagram of a communication system according to an embodiment of the present invention. As shown in FIG. 7, the communication system 700 includes a first user device 701 and a second user device 702. Among them, the first user apparatus 701 determines the resource for retransmitting the signal based on the resource for transmitting the signal first and the frequency hopping pattern, and retransmits the signal based on the determined resource, and the second The user device 702 receives the signal retransmitted by the first user device 701.

In the present embodiment, the first user device 701 and the second user device 702 can perform D2D communication or D2D discovery, but the present invention is not limited thereto.

In one embodiment, as shown in FIG. 7, the communication system 700 may further include a base station 703, which is said when the first user device 701 and the second user device 702 perform D2D communication. For the first user device 701, configure a resource to transmit the signal first, or if the first user device 701 and the second user device 702 perform D2D discovery, for the first user device 701. In addition, the resource that initially sends the signal can be configured semi-statically or dynamically.

Among them, the frequency hopping pattern may be dedicated to the user device (UE-specific), or may be dedicated to the cell (cell-specific) or common (common).

An embodiment of the present invention further provides a computer-readable program, wherein when the program is executed in the user apparatus, the program retransmits the signal according to the first or second embodiment to the computer in the user apparatus. Let the method run.

An embodiment of the present invention further provides a storage medium for storing a computer-readable program, wherein the computer-readable program is stored in a computer in a user device.
Alternatively, the signal retransmission method described in 2 is executed.

The above-mentioned devices and methods of the present invention may be realized by hardware, or may be realized by a combination of hardware and software. The present invention further relates to a computer-readable program such as the following, that is, when the program is executed by a logic component, the logic component is made to realize the above-mentioned device or component, or the logic component. , Realize the various methods or steps described above. The present invention further relates to a storage medium that stores the above-mentioned programs, such as a hard disk, a magnetic disk, an optical hard disk, a DVD, and a flash memory.

Further, one or more of the functional blocks and / or a combination of one or more of the functional blocks described in the drawings are general-purpose processing devices and digital signal processing devices for performing the functions described in the present invention. It may be implemented as a (DSP), application specific integrated circuit (ASIC), FPGA (field-programmable gate array) or other programmable logic device, logic gate or transistor logic device, hardware assembly or any other suitable combination. .. Further, one or more of the functional blocks and / or one or a plurality of combinations of the functional blocks described in the drawings are combinations of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, and the like. It may be implemented as one or more microprocessors or any other configuration communicatively connected to the DSP.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and any modification to the present invention belongs to the technical scope of the present invention unless the gist of the present invention is deviated.

Claims (17)

A signal transmitter that is configured as a first user device and performs D2D (Device to Device) communication or D2D discovery with the second user device.
A resource determination unit for determining a resource for transmitting the signal based on a randomly selected resource for initially transmitting a D2D communication or D2D discovery signal and a frequency hopping pattern is included.
A signal transmission device characterized in that PUSCH hopping type 1 or PUSCH hopping type 2 is adopted as the frequency hopping pattern in the D2D communication or D2D discovery, and the frequency hopping pattern is dedicated to or common to cells. The frequency hopping pattern is different for the plurality of first user devices that adopt different modes and perform D2D communication.
The signal transmitting device according to claim 1. For a plurality of the first user devices that employ different types and perform D2D discovery,
The frequency hopping pattern is different,
The signal transmitting device according to claim 1. Including additional receiving units
The configuration receiving unit is
When the first user device and the second user device perform D2D communication, they receive configuration information transmitted by a base station for configuring a randomly selected resource for transmitting the signal first. Or when the first user device and the second user device perform D2D discovery, the base station semi-statically or dynamically configured, randomly to transmit the signal first. Configured to receive configuration information to configure the selected resource in
The signal transmitting device according to claim 1. The resource determination unit further
When the first user device and the second user device perform D2D discovery, a resource for first transmitting the signal is randomly selected from a predetermined resource pool.
The signal transmitting device according to claim 1. The frequency hopping pattern adopts PUSCH hopping type 1 or PUSCH hopping type 2, and the frequency hopping pattern is cell-only or common, mode 1 is adopted for D2D communication. It is about the said first user apparatus to perform
Regarding the first user device that adopts mode 2 and performs D2D communication, the frequency hopping pattern adopts PUSCH hopping type 2, and the frequency hopping pattern is dedicated to the user device.
The signal transmitting device according to claim 1. Including an information transmission unit
The information transmission unit transmits instruction information for determining a transmission resource to the second user device, whereby the second user device transmits the transmitted signal based on the instruction information. Receive,
The signal transmitting device according to claim 1. The instruction information for determining the transmission resource includes the position information of the resource randomly selected for transmitting the signal first, the ID information regarding the user device that transmits the signal, and the sub that transmits the signal. Including frame position information,
The signal transmitting device according to claim 7. When the first user device and the second user device perform D2D communication, instruction information for determining the transmission resource is included in the scheduling allocation information and transmitted; or the first user device and the first user device and the first user device. (Ii) When the user device performs D2D discovery, the instruction information for determining the transmission resource is included in the discovery premable information and transmitted.
The signal transmitting device according to claim 7. A signal receiving device that is configured as a second user device and performs D2D (Device to Device) communication or D2D discovery with the first user device.
Including signal receiving unit
The signal receiving unit receives the D2D communication or D2D discovery signal transmitted by the first user device, and receives the signal.
The resource for transmitting the signal is determined by the first user device based on a resource randomly selected for transmitting the signal first and a frequency hopping pattern.
A signal receiving device that employs PUSCH hopping type 1 or PUSCH hopping type 2 as the frequency hopping pattern in the D2D communication or D2D discovery, and the frequency hopping pattern is dedicated to or common to cells. Including an information receiving unit
The information receiving unit receives instruction information for determining a transmission resource transmitted by the first user apparatus, whereby the signal receiving unit is transmitted based on the instruction information. Receive a signal,
The signal receiving device according to claim 10. The instruction information for determining the transmission resource includes the position information of the resource randomly selected for transmitting the signal first, the ID information regarding the user device that transmits the signal, and the sub that transmits the signal. Including frame position information,
The signal receiving device according to claim 11. When the first user device and the second user device perform D2D communication, instruction information for determining the transmission resource is included in the scheduling allocation information and transmitted; or the first user device and the first user device and the first user device. (Ii) When the user device performs D2D discovery, the instruction information for determining the transmission resource is included in the discovery premable information and transmitted.
The signal receiving device according to claim 11. The signal receiving unit acquires the position information of the resource in which the signal is located by detecting the DMRS (demodulation reference signal) sequence, and receives the transmitted signal based on the position information.
The signal receiving device according to claim 10. Including a signal processing unit
The signal processing unit performs reception and combination processing on the received signal.
The signal receiving device according to claim 10. Includes first and second user devices for D2D (Device to Device) communication or D2D discovery
The first user apparatus determines and determines the resource to transmit the signal based on a resource randomly selected for first transmitting the signal of D2D communication or D2D discovery and a frequency hopping pattern. Based on the resource, the signal is transmitted and
The second user device receives the signal transmitted by the first user device and receives the signal.
A communication system characterized in that PUSCH hopping type 1 or PUSCH hopping type 2 is adopted as the frequency hopping pattern in the D2D communication or D2D discovery, and the frequency hopping pattern is dedicated to or common to cells. Including more base stations
The base station
When the first user device and the second user device perform D2D communication, they constitute a randomly selected resource for the first user device to transmit the signal first; or the first. When the user device and the second user device perform D2D discovery, the resource randomly selected to transmit the signal first for the first user device is semi-statically or dynamically selected. Configure,
The communication system according to claim 16.

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