Signal retransmission device, method and communication system

Abstract

The embodiment of the present invention provides a signal retransmission device, method and communication system. The method comprises: determining the resource for retransmitting the signal according to the resource of the initially transmitted signal and the frequency hopping pattern, and retransmitting the signal to the second user equipment according to the determined resource. Through the embodiment of the present invention, the interference between user equipments can be randomized as much as possible, and the complexity of blind detection of the receiving end user equipment can be reduced as much as possible.

Description

[0001] This application is a divisional application of the Chinese invention patent application with application number "201480076558.6", application date "March 31, 2014", and invention name "Signal retransmission device, method and communication system". Technical Field

[0002] The present invention relates to the field of communication technology, and in particular to a signal retransmission device, method and communication system. Background Art

[0003] Currently, 3GPP RAN has begun to study device-to-device (D2D) related issues in the LTE system, aiming to evaluate the services between geographically adjacent devices in LTE. D2D related operations may include D2D discovery and D2D communication.

[0004] In D2D discovery, the user equipment selects resources in the configured resource pool to send a discovery signal. The discovery signal contains at least a discovery message and may contain discovery preamble information. According to current progress, it has been mentioned that multiple discovery messages are sent repeatedly in a discovery period to improve D2D discovery performance.

[0005] For example, in a discovery cycle, a discovery message carrying a discovery medium access control (MAC) protocol data unit (PDU) may be sent in a repeated manner to improve the D2D discovery probability.

[0006] On the other hand, another important topic of D2D is D2D communication. According to the current discussion progress, when sending D2D broadcast data, the D2D transmitting end user equipment will also adopt multiple retransmission methods to improve the communication quality.

[0007] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0008] In D2D discovery, when the discovery message is sent repeatedly, the resource selection method for each repeated transmission of the D2D transmitting user equipment needs to be clarified in the standard. According to the current discussion progress, two methods are provided: (1) The transmitting user equipment randomly selects the first resource from the discovery resources that can be used to repeatedly send the discovery message, that is, randomly selects the resource for the first transmission; the resources for other subsequent repeated transmissions are determined by the first resource; (2) The transmitting user equipment randomly selects resources from the discovery resources for each repeated transmission.

[0009] However, the inventors have found that in the above method (1), if the resources for subsequent repeated transmissions are determined only by the first resource, a possible problem is that when the first resources randomly selected by multiple D2D transmitting end user equipments collide, the subsequent repeated transmissions of D2D discovery messages will all have resource collisions. Therefore, it is impossible to ensure a low collision probability between the discovery signals of multiple D2D user equipments.

[0010] In the above method (2), the discovery signals of multiple transmitting user devices can be randomized to a certain extent. However, it is very difficult for the receiving user device to merge multiple discovery signal copies. The reason is that the receiving user device does not know the resource location of each discovery signal copy and can only merge based on the assumption of the possible resource location of each copy. Assuming that there are N resource options available for each discovery signal transmission, if it needs to be repeated M times, the worst case for the receiving user device is that N copies are required. M This method of randomly selecting resources each time a discovery signal copy is sent will greatly increase the decoding and demodulation complexity of the receiving end user equipment, thereby increasing power consumption.

[0011] Therefore, in D2D discovery, when the D2D discovery message is continuously or non-continuously sent repeatedly in a discovery cycle, a problem that needs to be studied is the resource selection problem for sending discovery signal copies to the D2D transmitting end user equipment, that is, on the one hand, it is necessary to randomize the interference problem of multiple D2D transmitting end user equipment sending discovery signals, and on the other hand, it is necessary to simplify the reception complexity of the D2D receiving end user equipment. In D2D communication, there is also the resource selection problem under D2D discovery.

[0012] The embodiment of the present invention provides a signal retransmission device, method and communication system. When determining the resource where the signal is repeatedly transmitted, it is necessary to fully consider both randomizing the interference between user equipments as much as possible and reducing the complexity of blind detection of the receiving user equipment as much as possible.

[0013] According to a first aspect of an embodiment of the present invention, a signal retransmission method is provided, which is applied to a first user equipment, and the method includes:

[0014] Determining resources for retransmitting the signal according to resources for initially sending the signal and a frequency hopping pattern;

[0015] The signal is retransmitted to the second user equipment according to the determined resources.

[0016] According to a second aspect of an embodiment of the present invention, a signal retransmission device is provided, which is configured in a first user equipment, and the device includes:

[0017] A resource determination unit, which determines a resource for retransmitting the signal according to a resource of an initially transmitted signal and a frequency hopping pattern;

[0018] A signal sending unit retransmits the signal to the second user equipment according to the resources determined by the resource determining unit.

[0019] According to a third aspect of an embodiment of the present invention, a signal retransmission method is provided, which is applied to a second user equipment, and the method includes:

[0020] A signal retransmitted by a first user equipment is received; wherein resources for retransmitting the signal are determined by the first user equipment according to resources for initially sending the signal and a frequency hopping pattern.

[0021] According to a fourth aspect of an embodiment of the present invention, a signal retransmission device is provided, which is configured in a second user equipment, and the device includes:

[0022] A signal receiving unit receives a signal retransmitted by a first user equipment; wherein resources for retransmitting the signal are determined by the first user equipment according to resources for initially sending the signal and a frequency hopping pattern.

[0023] According to a fifth aspect of an embodiment of the present invention, a communication system is provided, the communication system comprising:

[0024] The first user equipment determines a resource for retransmitting the signal according to a resource for initially sending the signal and a frequency hopping pattern, and retransmits the signal according to the determined resource;

[0025] The second user equipment receives the signal retransmitted by the first user equipment.

[0026] According to another aspect of an embodiment of the present invention, a computer-readable program is provided, wherein when the program is executed in a user equipment, the program enables a computer to execute the signal retransmission method as described above in the user equipment.

[0027] 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 enables a computer to execute the signal retransmission method as described above in a user equipment.

[0028] The beneficial effect of the embodiments of the present invention is that the resources of the retransmission signal are determined according to the resources of the initial transmission signal and the frequency hopping pattern; the interference between user devices can be randomized as much as possible, and the complexity of blind detection of the receiving user device can be reduced as much as possible.

[0029] With reference to the following description and accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents.

[0030] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0031] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Many aspects of the present invention may be better understood with reference to the following drawings. The components in the drawings are not drawn to scale, but are only for the purpose of illustrating the principles of the present invention. For the convenience of illustrating and describing some parts of the present invention, corresponding parts in the drawings may be enlarged or reduced.

[0033] The elements and features described in one figure or one embodiment of the present invention may be combined with the elements and features shown in one or more other figures or embodiments. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures, and can be used to indicate corresponding parts used in more than one embodiment.

[0034] Figure 1 is a flow chart of a signal retransmission method according to embodiment 1 of the present invention;

[0035] Figure 2 is a schematic diagram of an example of signal transmission according to Embodiment 1 of the present invention;

[0036] Figure 3 is a flow chart of a signal retransmission method according to Embodiment 2 of the present invention;

[0037] Figure 4is a schematic diagram of the structure of a signal retransmission device according to Embodiment 3 of the present invention;

[0038] Figure 5 is a schematic block diagram of a system structure of a user equipment according to embodiment 3 of the present invention;

[0039] Figure 6 is a schematic diagram of the structure of a signal retransmission device according to Embodiment 4 of the present invention;

[0040] Figure 7 It is a schematic diagram of the structure of the communication system of Example 5 of the present invention. DETAILED DESCRIPTION

[0041] With reference to the accompanying drawings, the above and other features of the present invention will become apparent through the following description. In the description and the accompanying drawings, specific embodiments of the present invention are specifically disclosed, which show some embodiments in which the principles of the present invention can be adopted, and it should be understood that the present invention is not limited to the described embodiments, on the contrary, the present invention includes all modifications, variations and equivalents falling within the scope of the attached claims.

[0042] In this embodiment, a signal is sent or retransmitted (also referred to as repeated transmission) between two user devices, and the two user devices can perform D2D communication or D2D discovery. However, the present invention is not limited thereto, and can also be applied to, for example, two user devices that do not perform D2D operations, and the specific scenario can be determined according to actual conditions. The following only takes the example of signal retransmission between two user devices that perform D2D communication or D2D discovery to illustrate the embodiment of the present invention.

[0043] Example 1

[0044] An embodiment of the present invention provides a signal retransmission method, which is applied to a first user equipment side serving as a signal sending end. Figure 1 FIG. 1 is a flow chart of a signal retransmission method according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0045] Step 101, the first user equipment determines a resource for retransmitting the signal according to a resource for initially sending a signal and a frequency hopping pattern;

[0046] Step 102: The first user equipment retransmits the signal to the second user equipment according to the determined resources.

[0047] In this embodiment, the signal may be a discovery signal during D2D discovery, or may be data during D2D communication, but the present invention is not limited thereto. In addition, a frequency hopping pattern may be predetermined; wherein the frequency hopping pattern may be cell-specific or common, or may be user equipment-specific (UE-specific), but the present invention is not limited thereto. For example, the frequency hopping pattern may also be a hopping type of a physical uplink shared channel (PUSCH) in an existing standard. For the specific content of frequency hopping, reference may also be made to related technologies, which will not be described in detail herein.

[0048] In step 101, the frequency hopping pattern is related to one or more of the following factors: the resource of the initial transmission signal; the subframe number of the corresponding retransmission / repetition signal event; and related ID information. The resource of the retransmission signal can be determined based on the frequency hopping pattern information. However, the present invention is not limited to this, and the factors related to the frequency hopping pattern can also be determined according to actual conditions.

[0049] For example, the relevant ID information may be a common ID for all user equipments, or a user equipment-specific ID; for example, it may be a cell ID, or it may be an ID of the sending user equipment or a cell radio network temporary identifier (C-RNTI, Cell Radio Network Temporary Identifier), etc. However, the present invention is not limited thereto, and specific information may be determined according to actual scenarios.

[0050] As an example, in D2D communication, the resource sequence number used for the i-th retransmission can be expressed by the following formula (1) or (2), but the present invention is not limited thereto.

[0051] n(i)=(n(0)+ID+f(i,j))mod N (1)

[0052] or

[0053] n(i)=(n(0)+f(i,j,ID))mod N (2)

[0054] Among them, n(0) represents the resource sequence number used for the initial transmission signal, that is, the starting resource block (RB); n(i) represents the starting RB position in the frequency domain of the retransmission; f(i, j) is a function of the subframe number #j where the retransmission is located, and f(i, j, ID) is a function related to the subframe number #j where the retransmission is located and the ID, for example, the function is a pseudo-random sequence whose initial value is determined by the ID; N represents the number of resources available in the frequency domain, that is, the number of RBs; ID represents information related to the sending user equipment ID. Depending on the mode of the sending UE (for example, Mode 1 or Mode 2, as described later), the frequency hopping pattern can be cell-specific or UE-specific, that is, sending UEs in different modes each use an independent frequency hopping type when repeatedly sending D2D signals.

[0055] Among them, the frequency hopping type adopted by the sending UE of Mode 1 is configured by the eNB, and the sending UE tells the receiving UE this frequency hopping type in the SA sent to the receiving UE. Therefore, the sending UE and the receiving UE send and receive data respectively according to the same hopping type. The sending UE of Mode 2 independently selects the frequency hopping type, and tells the receiving UE this frequency hopping type in the SA sent to the receiving UE.

[0056] For example, when the transmitting user equipment adopts Mode 1, the frequency hopping pattern is cell-specific, and the ID may be the serving cell ID of the user equipment, i.e., the cell ID, or the D2D broadcast ID. When the transmitting user equipment is Mode 2, the frequency hopping pattern is UE-specific, and the ID may be the relevant ID of the user equipment, such as C-RNTI or other ID that uniquely identifies the user equipment.

[0057] Therefore, unlike the prior art, this embodiment determines the retransmission resources based on the frequency hopping pattern, which can randomize the interference between user devices as much as possible; and, at the receiving end, the retransmission resources can also be determined based on the frequency hopping pattern, which can minimize the complexity of blind detection of the receiving end user equipment.

[0058] According to the current discussion on D2D communication, from the perspective of the transmitting user equipment, there are two modes of D2D communication: Mode 1 and Mode 2, depending on whether the D2D communication resources are allocated by the eNB or the UE autonomously selects the allocation. Among them, for the transmitting user equipment of Mode 1, the resources used for its D2D communication are configured by the eNB; for the transmitting user equipment of Mode 2, the resources used for its D2D communication are autonomously selected by the user equipment.

[0059] In addition, in the discussion of D2D discovery, D2D discovery is divided into two types: Type 1 D2D discovery and Type 2 D2D discovery. For Type 2 D2D discovery, it is further divided into Type 2A and Type 2B according to the way in which eNB allocates discovery resources.

[0060] Among them, Type1 D2D discovery means that the eNB semi-statically allocates a resource pool for D2D discovery, and this resource pool is shared by D2D user equipment (DUEs) (i.e., common resource pool); Type2A D2D discovery means that the eNB allocates dynamic UE-specific discovery resources for each DUE's D2D discovery event; Type2B D2D discovery means that the eNB semi-statically allocates UE-specific discovery resources.

[0061] In this embodiment, for the first user equipment using different modes for D2D communication, the frequency hopping patterns are different; or for the first user equipment using different types for D2D discovery, the frequency hopping patterns are different. That is, the frequency hopping patterns used by the sending UEs of different modes when performing D2D communication are configured independently of each other, and the frequency hopping patterns used by the sending UEs when performing different types of D2D discovery are also configured independently of each other.

[0062] In one embodiment, for a transmitting user equipment using Mode 1 in D2D communication, configuration information for configuring resources for initial signal transmission sent by a base station may be received, and the frequency hopping pattern used by the transmitting user equipment may be cell-specific or common. In addition, the frequency hopping type configured by the base station may also be received, and then the transmitting user equipment indicates the frequency hopping type used in sending an SA to the receiving user equipment.

[0063] For example, when the eNB allocates resources for sending a signal, the resources between multiple user equipments can be scheduled by the eNB, so that the frequency hopping pattern can be cell-specific or common. In this way, the eNB only needs to allocate the resources used for the initial transmission of the signal. If the signal is subsequently sent multiple times in a repeated transmission copy mode or a retransmission mode, the resources used for the retransmission copy can be hopped based on the initial transmission resources according to the cell-specific (or common) frequency hopping pattern.

[0064] Thus, the eNB can stagger the resources of the initial transmission signals of different user equipments, and perform frequency hopping based on a cell-specific (or common) frequency hopping pattern when retransmitting the signal, thereby reducing the overlap of resources used for the retransmission signals of multiple user equipments.

[0065] In another embodiment, for a transmitting user equipment using Mode 2 in D2D communication, the configuration information of the resource for initially sending the signal can be selected autonomously, and the frequency hopping pattern used by the transmitting user equipment is user equipment-specific (UE-specific). In addition, the transmitting user equipment can autonomously select the type of frequency hopping used, and indicate the type of frequency hopping used when sending SA to the receiving user equipment.

[0066] For example, when a UE autonomously selects resources for transmitting a signal, the effect of randomizing interference between multiple user equipments can be achieved through frequency hopping. Interference randomization is mainly achieved by randomizing the selected resources, so the frequency hopping pattern is UE-specific.

[0067] Here, when the user equipment autonomously selects the resource for sending the signal for signal transmission, it cannot be guaranteed that the resources used for the initial transmission autonomously selected by different user equipments will not collide. In this case, the UE-specific frequency hopping pattern makes it possible to randomize the resources for subsequent retransmissions (repeated transmission copies) even if the resources initially sent by different user equipments collide, thereby reducing the probability of collision of the resources for subsequent retransmissions.

[0068] In another embodiment, for a transmitting user equipment using Type 1 in D2D discovery, the configuration information of the resource for initially sending the signal can be autonomously selected from a pre-set resource pool. The frequency hopping pattern is user equipment-specific (UE-specific), and the frequency hopping type can be configured together when the eNB or base station configures the resource pool.

[0069] In another embodiment, for a transmitting end user equipment using Type 2A or Type 2B in D2D discovery, configuration information for configuring resources for initially sending the signal sent by the base station may be received, wherein the frequency hopping pattern is cell-specific or common, and the frequency hopping type may be configured together when the eNB or base station configures resource information.

[0070] In this embodiment, different hopping information can be used for different scenarios to achieve different purposes. For cell-specific (common) hopping information, when all UEs repeatedly send signals, the resources used for retransmitting signals hop in the frequency domain according to a common hopping pattern; for UE-specific hopping information, when all users repeatedly send signals, the resources used for retransmitting signals hop in the frequency domain according to a user-specific hopping pattern.

[0071] In another embodiment, for a transmitting user equipment using Mode 1 in D2D communication, when sending D2D data, the positional relationship between the resources used for signal retransmission and the resources used for initial transmission can adopt the PUSCH hopping scheme (or hopping type) in the existing standard, namely Type 1 PUSCH hopping and Type 2 PUSCH hopping.

[0072] Specifically, when Type 1 PUSCH hopping is used, the hopping information N of 1 bit or 2 bits in the downlink control information (DCI, Downlink Control Information) sent by the eNB for D2D communication is used. UL_hop The value of and the size of the system bandwidth, or the 1-bit or 2-bit hopping information N in the DCI for D2D communication sent by the eNB UL_hop As well as the size of the resource pool pre-configured for the D2D communication, the hopping offset value (hopping offset) of the frequency domain hopping of the transmitting end user equipment can be or One of three values. Different from the definition in existing standards (This value indicates the number of PUSCH resource blocks when a cellular user sends uplink data for PUSCHhopping). Indicates the number of PUSCH resource blocks when a D2D user equipment sends D2D data in D2D communication. This value can be the size of a pre-configured resource pool.

[0073] When allocating resources to the transmitting user equipment, the eNB may indicate the hopping type of the transmitting user equipment to retransmit or repeat data through signaling. The transmitting user equipment may also send the hopping type to the receiving user equipment, for example, through scheduling assignment (SA) information.

[0074] When a similar Type2 PUSCH hopping method is used, the resources used for subsequent retransmissions are determined by the resources used for initial transmission and the predefined frequency hopping scheme (cell-specific or common). In this case, the ID can be the cell ID or the D2D broadcast ID information. When a similar Type1 PUSCH hopping method is used, the resources used for subsequent retransmissions by the transmitting user equipment are obtained from the scheduling grant sent by the eNB to the transmitting user equipment; after the receiving user equipment learns the SA information sent by the transmitting user equipment, it obtains the resources used by the transmitting user equipment to send the retransmitted data from the SA information.

[0075] In another embodiment, for a transmitting user equipment using Mode 2 in D2D communication, when sending D2D data, the positional relationship between the resources used for signal retransmission and the resources used for initial transmission can adopt Type2 PUSCH hopping in the existing standard. In this embodiment, the resources used for subsequent retransmissions are jointly determined by the resources used for initial transmission and a frequency hopping pattern randomly selected from a predefined frequency hopping pattern set. Among them, the resources used for initial transmission and the selected hopping pattern can be indicated in the SA information. In addition, the resources used for subsequent retransmissions are jointly determined by the resources used for initial transmission and a user-specific frequency hopping pattern (UE-specific frequency hopping pattern). Among them, the resources used for initial transmission and the UE-specific ID information that determines the UE-specific hopping scheme can be indicated in the SA information.

[0076] Figure 2 FIG. 1 is a schematic diagram of an example of signal transmission according to an embodiment of the present invention. Figure 2 As shown, the resource selected when the signal is initially sent is #1, and when the signal is subsequently retransmitted, resource selection can be performed based on the resource of the initially sent signal and the frequency hopping pattern.

[0077] In this embodiment, the receiving end user equipment can know the frequency hopping pattern in advance and can determine the resource where the retransmission signal is located according to the frequency hopping pattern, thereby reducing the complexity of blind detection of the receiving end user equipment as much as possible.

[0078] Specifically, the first user equipment may send indication information for determining retransmission resources to the second user equipment, so that the second user equipment receives the retransmitted signal according to the indication information. The indication information for determining the retransmission resources may include: resource location information for initially sending the signal, identification information related to the user equipment sending the signal, and subframe location information for retransmission of the signal. However, the present invention is not limited to this, for example, some relevant information may be predefined, and the receiving end user equipment may perform blind detection according to the predefined information.

[0079] In one implementation, when the first user equipment performs D2D communication with the second user equipment, the indication information for determining the retransmission resource may be carried in the SA.

[0080] Specifically, in D2D communication, SA is sent before D2D data is sent, and the content of SA contains some scheduling information of D2D data. SA may include: indicating the resource location used for the initial transmission of D2D data, information related to the transmitting user equipment, and subframe location information of multiple transmissions of D2D data. By designing a common principle known to both the transmitting and receiving ends (i.e., a frequency hopping scheme), the relationship between the resources used for the initial transmission and the resources used for subsequent transmissions is established. Therefore, by demodulating the SA, the D2D receiving user equipment can clearly know the resource location of the first D2D data transmission, and then the resource location of the subsequent retransmission / repeated signal can be derived according to formula (1) or (2).

[0081] In another embodiment, when the first user equipment performs D2D discovery with the second user equipment, the indication information for determining the retransmission resource may be carried in a discovery preamble.

[0082] Specifically, unlike D2D communication, there is currently no SA sent in D2D discovery to indicate the resource location of the D2D discovery message. However, in D2D discovery, a discovery preamble may be sent before sending the D2D discovery message; the discovery preamble can assist in demodulating the discovery message. By demodulating the discovery preamble, information related to the ID of the sending user equipment can be obtained, which can be used to carry the UE-specific scrambling information of the PUSCH signal transmitted by the discovery message.

[0083] In D2D discovery, a discovery message occupies a fixed number m of PRBs. When the configured resource pool contains M PRBs in the frequency domain, there are a total of N = M / m resource unit information. In this case, n(i) in formula (1) or (2) can represent the starting RB position in the frequency domain of the retransmission or the sequence number of the frequency domain resource unit.

[0084] It can be seen from the above embodiments that the resources of the retransmission signal are determined according to the resources of the initial transmission signal and the frequency hopping pattern; this can not only randomize the interference between user equipments as much as possible, but also reduce the complexity of blind detection of the receiving user equipment as much as possible.

[0085] Example 2

[0086] The embodiment of the present invention provides a signal retransmission method, which is applied to a second user equipment as a signal receiving end, and the same contents as those in Embodiment 1 are not repeated here. Figure 3 FIG. 1 is a flow chart of a signal retransmission method according to an embodiment of the present invention. Figure 3 As shown, the method includes:

[0087] Step 301: A second user equipment receives a signal retransmitted by a first user equipment; wherein resources for retransmitting the signal are determined by the first user equipment according to resources for initially sending the signal and a frequency hopping pattern.

[0088] like Figure 3 As shown, the method may also include:

[0089] Step 302: The second user equipment performs reception combining processing on the received signals. As for how to combine the signals, any related method in the prior art may be adopted, which will not be described in detail here.

[0090] In this embodiment, the second user equipment may receive indication information sent by the first user equipment for determining retransmission resources, so that the second user equipment receives the retransmitted signal according to the indication information. The indication information for determining the retransmission resource may include: resource location information for initially sending the signal, identification information related to the user equipment sending the signal, and subframe location information for retransmission of the signal. However, the present invention is not limited thereto, and for example, the second user equipment may also receive the signal by blind detection.

[0091] In one implementation, when the first user equipment performs D2D communication with the second user equipment, indication information for determining retransmission resources may be carried in the SA.

[0092] In another embodiment, when the first user equipment and the second user equipment perform D2D discovery, indication information for determining the retransmission resource may be carried in the discovery preamble information. After obtaining the indication information, the user equipment may use a solution such as formula (1) or (2) to determine the resource location of the retransmitted signal.

[0093] For example, the second user equipment blindly detects the discovery preamble in all possible subframes; once correctly detected, the frequency domain position of the subsequent discovery message retransmission / repetition can be obtained according to, for example, formula (1) or (2), and then reception combining (for example, soft combining) is performed. The ID information in formula (1) or (2) can be obtained from the discovery preamble.

[0094] In another embodiment, when the first user equipment and the second user equipment perform D2D discovery, there is no discovery preamble. The second user equipment can perform blind detection at all possible subframe positions of the initial transmission of the D2D discovery message, and determine whether there is a message sent by detecting the demodulation reference signal (DMRS, Demodulation Reference Signal) sequence, and determine the frequency domain position of the initially transmitted D2D discovery message, that is, n(0) in formula (1) or (2). Based on this assumption, the subsequent retransmission / repetition of the D2D discovery message is demodulated, and reception merging is performed until the D2D discovery message is correctly demodulated. Among them, the ID information in formula (1) or (2) can be obtained from the DMRS sequence of the initially transmitted D2D discovery message, or it can be predefined ID information (for example, multiple IDs can be predefined).

[0095] It can be seen from the above embodiments that the resources of the retransmission signal are determined according to the resources of the initial transmission signal and the frequency hopping pattern; this can not only randomize the interference between user equipments as much as possible, but also reduce the complexity of blind detection of the receiving user equipment as much as possible.

[0096] Example 3

[0097] The embodiment of the present invention provides a signal retransmission device, which is configured in a first user equipment. The embodiment of the present invention corresponds to the signal retransmission method of embodiment 1, and the same contents are not repeated here.

[0098] Figure 4 FIG. 1 is a schematic diagram of a signal retransmission device according to an embodiment of the present invention. Figure 4 As shown, the signal retransmission device 400 includes: a resource determination unit 401 and a signal sending unit 402. The resource determination unit 401 determines the resource for retransmitting the signal according to the resource of the initially transmitted signal and the frequency hopping pattern; the signal sending unit 402 retransmits the signal to the second user equipment according to the resource determined by the resource determination unit 401.

[0099] In this embodiment, the frequency hopping pattern is different for the first user equipment using different modes for D2D communication; or the frequency hopping pattern is different for the first user equipment using different types for D2D discovery. The frequency hopping pattern can be cell-specific or user equipment-specific.

[0100] In one embodiment, if Figure 4 As shown, the signal retransmission device 400 may also include: a configuration receiving unit 403, which receives configuration information sent by the base station for configuring resources for initially sending signals when the first user equipment and the second user equipment perform D2D communication; or receives configuration information sent by the base station semi-statically or dynamically for configuring resources for initially sending signals when the first user equipment and the second user equipment perform D2D discovery.

[0101] In another embodiment, the resource determination unit 401 can also be used to randomly select resources for initially sending signals when the first user equipment and the second user equipment perform D2D communication; or to randomly select resources for initially sending signals from a predetermined resource pool when the first user equipment and the second user equipment perform D2D discovery.

[0102] In another implementation, the frequency hopping pattern may be PUSCH hopping type information.

[0103] In another embodiment, Figure 4 As shown, the signal retransmission device 400 may further include: an information sending unit 404, which sends indication information for determining retransmission resources to the second user equipment, so that the second user equipment receives the retransmitted signal according to the indication information.

[0104] The indication information for determining the retransmission resource may include: resource location information of the initially transmitted signal, identification information related to the user equipment that transmits the signal, and subframe location information of the retransmission signal. However, the present invention is not limited thereto.

[0105] In this embodiment, when the first user equipment and the second user equipment perform D2D communication, the indication information for determining the retransmission resources may be carried in the scheduling allocation information; or when the first user equipment and the second user equipment perform D2D discovery, the indication information for determining the retransmission resources may be carried in the discovery preamble information.

[0106] An embodiment of the present invention further provides a user equipment, comprising the signal retransmission device 400 as described above.

[0107] Figure 5 FIG. 5 is a schematic block diagram of a system structure of a user equipment 500 according to an embodiment of the present invention. Figure 5 As shown, the user equipment 500 may include a central processor 100 and a memory 140; the memory 140 is coupled to the central processor 100. It should be noted that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0108] In one embodiment, the function of the signal retransmission device 400 may be integrated into the central processing unit 100. The central processing unit 100 may be configured to implement the signal retransmission method as described in the first embodiment.

[0109] In another embodiment, the signal retransmission device 400 may be configured separately from the central processor 100. For example, the signal retransmission device 400 may be configured as a chip connected to the central processor 100, and the functions of the signal retransmission device 400 are realized through the control of the central processor.

[0110] like Figure 5 As shown, the user device 500 may also include: a communication module 110, an input unit 120, an audio processing unit 130, a display 160, and a power supply 170. It is worth noting that the user device 500 does not necessarily have to include Figure 5 In addition, the user equipment 500 may also include Figure 5 For components not shown, reference may be made to the prior art.

[0111] like Figure 5 As shown, the central processor 100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor devices and / or logic devices. The central processor 100 receives inputs and controls the operations of various components of the user device 500.

[0112] The memory 140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. Information related to the failure may be stored, and a program for executing the related information may also be stored. The central processing unit 100 may execute the program stored in the memory 140 to implement information storage or processing, etc. The functions of other components are similar to those of the prior art and will not be described in detail herein. The components of the user equipment 500 may be implemented by dedicated hardware, firmware, software or a combination thereof without departing from the scope of the present invention.

[0113] It can be seen from the above embodiments that the resources of the retransmission signal are determined according to the resources of the initial transmission signal and the frequency hopping pattern; this can not only randomize the interference between user equipments as much as possible, but also reduce the complexity of blind detection of the receiving user equipment as much as possible.

[0114] Example 4

[0115] The embodiment of the present invention provides a signal retransmission device, which is configured in a second user equipment. The embodiment of the present invention corresponds to the signal retransmission method of embodiment 2, and the same contents are not repeated here.

[0116] Figure 6 FIG. 1 is a schematic diagram of a signal retransmission device according to an embodiment of the present invention. Figure 6 As shown, the signal retransmission device 600 includes: a signal receiving unit 601, receiving a signal retransmitted by a first user equipment; wherein the resource for retransmitting the signal is determined by the first user equipment according to the resource of the initially transmitted signal and a frequency hopping pattern.

[0117] like Figure 6 As shown, the signal retransmission device 600 may further include: a signal processing unit 602, which performs reception combining processing on the received signal.

[0118] In one embodiment, if Figure 6 As shown, the signal retransmission device 600 may further include: an information receiving unit 603, receiving indication information sent by the first user equipment for determining retransmission resources, so that the signal receiving unit receives the retransmitted signal according to the indication information.

[0119] The indication information used to determine the retransmission resource includes: resource location information of the initially transmitted signal, identification information related to the user equipment that transmits the signal, and subframe location information of the retransmission signal. However, the present invention is not limited thereto.

[0120] In this embodiment, when the first user equipment and the second user equipment perform D2D communication, the indication information for determining the retransmission resources is carried in the scheduling allocation information; or when the first user equipment and the second user equipment perform D2D discovery, the indication information for determining the retransmission resources is carried in the discovery preamble information.

[0121] In another implementation, the signal receiving unit 601 obtains the location information of the resource where the signal is located by detecting a DMRS sequence, and receives the retransmitted signal according to the location information.

[0122] The embodiment of the present invention further provides a user equipment, including the signal retransmission device 600 as described above; the configuration of the user equipment can be referred to Figure 5 .

[0123] It can be seen from the above embodiments that the resources of the retransmission signal are determined according to the resources of the initial transmission signal and the frequency hopping pattern; this can not only randomize the interference between user equipments as much as possible, but also reduce the complexity of blind detection of the receiving user equipment as much as possible.

[0124] Example 5

[0125] An embodiment of the present invention provides a communication system, and the same contents as those of Embodiments 1 to 4 are not repeated here.

[0126] Figure 7 FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention. Figure 7 As shown, the communication system 700 includes: a first user equipment 701 and a second user equipment 702. The first user equipment 701 determines the resources for retransmitting the signal according to the resources of the initially transmitted signal and the frequency hopping pattern, and retransmits the signal according to the determined resources; the second user equipment 702 receives the signal retransmitted by the first user equipment 701.

[0127] In this embodiment, the first user equipment 701 performs D2D communication or D2D discovery with the second user equipment 702, but the present invention is not limited thereto.

[0128] In one embodiment, if Figure 7 As shown, the communication system 700 may further include: a base station 703, which configures resources for initially sending signals for the first user equipment 701 when the first user equipment 701 and the second user equipment 702 perform D2D communication; or semi-statically or dynamically configures resources for initially sending signals for the first user equipment 701 when the first user equipment 701 and the second user equipment 702 perform D2D discovery.

[0129] The frequency hopping pattern may be user equipment-specific (UE-specific), or may be cell-specific (cell-specific) or common (common).

[0130] An embodiment of the present invention further provides a computer-readable program, wherein when the program is executed in a user equipment, the program enables the computer to execute the signal retransmission method described in embodiment 1 or 2 in the user equipment.

[0131] An embodiment of the present invention further provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the signal retransmission method described in Embodiment 1 or 2 in a user equipment.

[0132] The above devices and methods of the present invention can be implemented by hardware, or by hardware combined with software. The present invention relates to such a computer-readable program, which, when executed by a logic component, enables the logic component to implement the above-mentioned devices or components, or enables the logic component to implement the above-mentioned various methods or steps. The present invention also relates to a storage medium for storing the above-mentioned program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0133] For one or more of the functional blocks described in the drawings and / or one or more combinations of functional blocks, it can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof for performing the functions described in the present application. For one or more of the functional blocks described in the drawings and / or one or more combinations of functional blocks, it can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0134] The present invention has been described above in conjunction with specific embodiments, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various modifications and variations to the present invention based on the spirit and principles of the present invention, and these modifications and variations are also within the scope of the present invention.

Claims

1. A signal sending device, configured in a first user equipment, performs D2D (Device to Device) communication or D2D discovery with a second user equipment, the device comprising: a resource determination unit, which determines a resource for repeatedly sending the signal based on the randomly selected resource for initially sending the signal and the frequency hopping pattern; as well as a signal sending unit, sending the signal to the second user equipment according to the determined resource for repeatedly sending the signal, In the D2D communication or D2D discovery, the frequency hopping pattern adopts PUSCH hopping type 1, or adopts PUSCH hopping type 2, and the frequency hopping pattern is cell-specific or common, wherein the frequency hopping pattern is directly related to one or more of the following information: resource location information for initially sending the signal, identification information related to a user equipment sending the signal, and subframe location information for sending the signal; The apparatus further includes an information sending unit, which sends indication information for determining retransmission resources to the second user equipment, so that the second user equipment receives the sent signal according to the indication information.

2. The device according to claim 1, wherein: For a plurality of the first user equipments that adopt different modes to perform D2D communication, the frequency hopping patterns are different; or for a plurality of the first user equipments that adopt different types to perform D2D discovery, the frequency hopping patterns are different.

3. The device according to claim 1, wherein: The device also includes: A configuration receiving unit is configured to receive configuration information sent by the base station for configuring resources for initially sending the signal when the first user equipment and the second user equipment perform D2D communication; or to receive configuration information semi-statically or dynamically sent by the base station for configuring resources for initially sending the signal when the first user equipment and the second user equipment perform D2D discovery.

4. The device according to claim 1, wherein: The resource determination unit is also used to randomly select resources for initially sending the signal when the first user equipment and the second user equipment perform D2D communication; or to randomly select resources for initially sending the signal from a predetermined resource pool when the first user equipment and the second user equipment perform D2D discovery.

5. The device according to claim 1, wherein: For the first user equipment that adopts mode 1 for D2D communication, the frequency hopping pattern adopts PUSCH hopping type 1, or adopts PUSCH hopping type 2 and the frequency hopping pattern is cell-specific or common; For the first user equipment that adopts mode 2 for D2D communication, the frequency hopping pattern adopts PUSCH hopping type 2, and the frequency hopping pattern is dedicated to the user equipment.

6. The device according to claim 1, wherein: The indication information used to determine the sending resource includes: resource location information of the initially sent signal, identification information related to the first user equipment sending the signal, and subframe location information of the retransmission of the signal.

7. A signal receiving device, configured in a second user equipment, for performing D2D (Device to Device) communication or D2D discovery with a first user equipment, the device comprising: a signal receiving unit, receiving a signal retransmitted by the first user equipment using the determined resources; The resource is randomly selected by the first user equipment and is determined according to the resource for initially sending the signal and a frequency hopping pattern, In the D2D communication or D2D discovery, the frequency hopping pattern adopts PUSCH hopping type 1, or adopts PUSCH hopping type 2, and the frequency hopping pattern is cell-specific or common, wherein the frequency hopping pattern is directly related to one or more of the following information: resource location information for initially sending the signal, identification information related to a user equipment sending the signal, and subframe location information for sending the signal; The device also includes an information receiving unit, which receives indication information retransmitted by the first user equipment for determining retransmission resources, so that the signal receiving unit receives the retransmitted signal in the determined retransmission resources according to the indication information.

8. The device according to claim 7, wherein: The indication information used to determine the sending resource includes: resource location information for initially sending the signal, identification information related to the first user equipment sending the signal, and subframe location information for retransmitting the signal.

9. A communication system, comprising: A first user equipment and a second user equipment performing D2D (Device to Device) communication or D2D discovery, The first user equipment determines, according to the resources randomly selected for initially sending the signal and the frequency hopping pattern, resources for retransmitting the signal, retransmits the signal to the second user equipment according to the determined resources, and sends indication information for determining the retransmission resources for retransmission to the second user equipment; a second user equipment, receiving the indication information from the first user equipment, and receiving the signal retransmitted by the first user equipment in a retransmission resource determined according to the indication information, In the D2D communication or D2D discovery, the frequency hopping pattern adopts PUSCH hopping type 1, or adopts PUSCH hopping type 2, and the frequency hopping pattern is cell-specific or public, wherein the frequency hopping pattern is directly related to one or more of the following information: resource location information for initially sending the signal, identification information related to the user equipment sending the signal, and subframe location information for sending the signal.

10. The communication system according to claim 9, wherein: The communication system further comprises: The base station configures resources for initially sending the signal for the first user equipment when the first user equipment performs D2D communication with the second user equipment; or semi-statically or dynamically configures resources for initially sending the signal for the first user equipment when the first user equipment performs D2D discovery with the second user equipment.

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