JP6463823B2 - Reference signal transmission method and user equipment - Google Patents

Description

  Embodiments of the present invention relate to the field of wireless communication, and more particularly to a reference signal transmission method and user equipment.

  A device-to-device proximity service (English: Device to Device Proximity Service, D2D ProSe for short) is a research subject for a long term evolution (English: Long Term Evolution, abbreviated LTE).

  In the process of designing the physical layer of D2D ProSe, two main modes of discovery signal design and direct connection communication design may be classified from a design viewpoint. The purpose of discovery signal design is to allow user equipment (UE: User Equipment, UE for short) to identify UEs that are close to the network environment. The discovery signal design includes transmitting a discovery signal and receiving the discovery signal. The purpose of direct connection communication design is to design a direct connection communication procedure between UEs, including a series of procedures such as call initiation, channel sounding, channel feedback, resource scheduling, data transmission, and call completion.

  When the UE receives a discovery signal or a direct connection communication signal, the UE needs to perform channel estimation by using the reference signal and perform subsequent demodulation and decoding processes.

  Therefore, it is necessary to quickly solve how to execute the reference signal transmission in the D2D communication.

  Embodiments of the present invention provide a reference signal transmission method and user equipment for performing reference signal transmission in D2D communication.

  In accordance with the first aspect, the first user equipment determines a first identifier associated with the first user equipment and is selected by the first user equipment according to the first identifier. Determining a first cyclic shift indication from the cyclic shift indication, and determining a first reference signal by the first user equipment according to the first cyclic shift indication and a preset basic sequence. And transmitting a first reference signal to a second user equipment by a first user equipment.

  With reference to the first aspect, the step of determining, by the first user equipment, the first identifier associated with the first user equipment in the execution manner of the first aspect, Determining a first identifier according to a first identifier transmitted in the received request transmitted by the second user equipment.

The first identifier associated with the first user equipment by the first user equipment in the first aspect or another implementation of the first aspect with reference to the execution scheme described above of the first aspect. Prior to determining the method, the method further includes receiving a request transmitted by the first user equipment by the second user equipment, the request carrying the first identifier.

  Reference to the first user equipment by the first user equipment in the first aspect or another execution manner of the first aspect with reference to any one of the execution methods described above of the first aspect. Determining the first identifier to include includes selecting the identifier as the first identifier by the first user equipment according to a preset rule from the identifier associated with the first user equipment.

  Referring to any one of the first aspect or the above-described execution scheme of the first aspect, the first cyclic shift indication by the first user equipment in another execution scheme of the first aspect. And determining the first reference signal according to the preset basic sequence, the first reference signal after performing a cyclic shift in the basic sequence according to the first cyclic shift indication by the first user equipment. Including the step of obtaining

Selection according to the first identifier by the first user equipment in the first mode or another mode of execution of the first mode with reference to any one of the execution modes described above of the first mode. Determining the first cyclic shift indication from the cyclic shift indication to be performed is the k th cycle of the n cyclic shift indications to be selected by the first user equipment. Determining a shift indication as a first cyclic shift indication, where n is the number of cyclic shift indications to be selected, and m ₁ is determined based on the first identifier Value, k = mod (m ₁ , n).

Referring to any one of the first aspect, or the above-described execution scheme of the first aspect, in another execution scheme of the first aspect, the first identifier is one of the first user equipment Including an identifier, m ₁ is equal to the value of the first identifier.

Referring to any one of the first aspect, or the above-described execution scheme of the first aspect, in another execution scheme of the first aspect, the first identifier is at least 2 of the first user equipment. M ₁ is a value determined based on the value of at least two identifiers according to a pre-set operational rule.

  Selection according to the first identifier by the first user equipment in the first mode or another mode of execution of the first mode with reference to any one of the execution modes described above of the first mode. The step of determining a first cyclic shift indication from the cyclic shift indication to be performed is used by the first user equipment to transmit a first identifier value and a first reference signal. Determining a first cyclic shift indication according to the value of the first parameter of the resource.

With reference to any one of the first aspect, or the above-described execution method of the first aspect, the value of the first identifier by the first user equipment in another execution method of the first aspect, And determining the first cyclic shift indication according to the value of the first parameter of the resource used to transmit the first reference signal is selected n by the first user equipment. Determining the kth cyclic shift indication among the cyclic shift indications to be a first cyclic shift indication, where n is the number of cyclic shift indications to be selected; m _2, according to pre-set operating rules, a value determined based on the values and the first parameter of the first identifier, is k = mod (m 2, n )

  Referring to any one of the first aspect, or the above-described execution method of the first aspect, in another execution method of the first aspect, the first parameter is the following parameter corresponding to the resource: One or more of a frame number, a subframe number, a physical resource block number, or a bandwidth are included.

  With reference to any one of the first aspect, or the above-described execution method of the first aspect, the value of the first identifier by the first user equipment in another execution method of the first aspect, And determining the first cyclic shift indication according to the value of the first parameter of the resource used to transmit the first reference signal, the value of the first identifier by the first user equipment Determining a first cyclic shift indication according to the first parameter value and the first offset value, wherein the first offset value is a cell identifier value of a cell in which the first user equipment is located. , The identifier value of the D2D cluster to which the first user equipment belongs, or the offset value configured by the first communication device.

  Selection according to the first identifier by the first user equipment in the first mode or another mode of execution of the first mode with reference to any one of the execution modes described above of the first mode. Determining the first cyclic shift indication from the cyclic shift indication to be performed by the first user equipment according to the first identifier value and the first offset value. The first offset value is configured by a cell identifier value of a cell in which the first user equipment is located, an identifier value of a D2D cluster to which the first user equipment belongs, or a first communication device Offset value.

  Referring to any one of the first aspect, or the above-described execution method of the first aspect, in another execution method of the first aspect, the first identifier is the following of the first user equipment: Including one or more of an identifier, a D2D identifier, an IMSI, a TMSI, a D2D user group identifier, a service type identifier, or a D2D cluster identifier, and the D2D user group identifier indicates a D2D user group to which the first user equipment belongs. Used to indicate, the service type identifier is used to indicate the service type provided by the first user equipment.

  In accordance with the second aspect, a second user equipment determines a first identifier associated with the first user equipment and is selected by the second user equipment according to the first identifier. Determining a first cyclic shift indication from the cyclic shift indication, and determining a second reference signal by the second user equipment according to the first cyclic shift indication and a preset basic sequence. And performing channel sounding on the channel according to the received first reference signal transmitted by the second user equipment through the second reference signal and the channel, the first reference signal Is provided with a reference signal transmission method transmitted by a first user equipment.

  Referring to the second aspect, the step of determining, by the second user equipment, the first identifier associated with the first user equipment by the second user equipment in the execution manner of the second aspect, Determining the first identifier in accordance with a request transmitted to the first user equipment and carrying the first identifier.

The first identifier associated with the first user equipment by the second user equipment in the second aspect or another implementation of the second aspect with reference to the above-described execution scheme of the second aspect. Prior to the step of determining, the method further includes the step of transmitting a request by the second user equipment to the first user equipment, wherein the request carries the first identifier.

  Referring to any one of the second aspect, or the above-described execution scheme of the second aspect, the first cyclic shift indication by the second user equipment in another execution scheme of the second aspect And determining the second reference signal according to the preset basic sequence, after performing a cyclic shift in the basic sequence according to the first cyclic shift indication by the second user equipment. The method further includes obtaining.

Selection according to the first identifier by the second user equipment in the second mode or another mode of execution of the second mode with reference to any one of the execution modes described above of the second mode. Determining the first cyclic shift indication from the cyclic shift indication to be performed is the k th cycle among the n cyclic shift indications to be selected by the second user equipment. Determining a shift indication as a first cyclic shift indication, where n is the number of cyclic shift indications to be selected, and m ₁ is determined based on the first identifier Value, k = mod (m ₁ , n).

Referring to any one of the second aspect, or the above-described execution scheme of the second aspect, in another execution scheme of the second aspect, the first identifier is one of the first user equipment Including an identifier, m ₁ is equal to the value of the first identifier.

Referring to any one of the second aspect, or the above-described execution method of the second aspect, in another execution method of the second aspect, the first identifier is at least 2 of the first user equipment. M ₁ is a value determined based on the value of at least two identifiers according to a pre-set operational rule.

  Selection according to the first identifier by the second user equipment in the second mode or another mode of execution of the second mode with reference to any one of the execution modes described above of the second mode. Determining the first cyclic shift indication from the cyclic shift indication to be performed is used by the second user equipment to transmit the value of the first identifier and the first reference signal. Determining a first cyclic shift indication according to the value of the first parameter of the resource.

Referring to any one of the second aspect, or the above-described execution scheme of the second aspect, in another execution scheme of the second aspect, the value of the first identifier by the second user equipment, And determining the first cyclic shift indication according to the value of the first parameter of the resource used to transmit the first reference signal is selected n by the second user equipment. Determining the kth cyclic shift indication among the cyclic shift indications to be a first cyclic shift indication, where n is the number of cyclic shift indications to be selected; m _2, according to pre-set operating rules, a value determined based on the values and the first parameter of the first identifier, is k = mod (m 2, n )

  With reference to any one of the second aspect, or the above-described execution method of the second aspect, in another execution method of the second aspect, the first parameter is the following parameter corresponding to the resource: One or more of a frame number, a subframe number, a physical resource block number, or a bandwidth are included.

  Referring to any one of the second aspect, or the above-described execution scheme of the second aspect, in another execution scheme of the second aspect, the value of the first identifier by the second user equipment, And determining the first cyclic shift indication according to the value of the first parameter of the resource used to transmit the first reference signal is a value of the first identifier by the second user equipment. Determining a first cyclic shift indication according to the first parameter value and the first offset value, wherein the first offset value is a cell identifier value of a cell in which the first user equipment is located. , The identifier value of the D2D cluster to which the first user equipment belongs, or the offset value configured by the first communication device.

  Selection according to the first identifier by the second user equipment in the second mode or another mode of execution of the second mode with reference to any one of the execution modes described above of the second mode. Determining the first cyclic shift indication from the cyclic shift indication to be performed by the second user equipment according to the first identifier value and the first offset value. The first offset value is configured by a cell identifier value of a cell in which the first user equipment is located, an identifier value of a D2D cluster to which the first user equipment belongs, or a first communication device Offset value.

  Referring to any one of the second aspect, or the above-described execution scheme of the second aspect, in another execution scheme of the second aspect, the first identifier is the following for the first user equipment: Including one or more of an identifier, a D2D identifier, an IMSI, a TMSI, a D2D user group identifier, a service type identifier, or a D2D cluster identifier, and the D2D user group identifier indicates a D2D user group to which the first user equipment belongs. Used to indicate, the service type identifier is used to indicate the service type provided by the first user equipment.

  According to a third aspect, to be selected according to a first determination unit configured to determine a first identifier associated with the user equipment and a first identifier determined by the first determination unit. A second determination unit configured to determine a first cyclic shift indication from the cyclic shift indication comprising: a first cyclic shift indication determined by the second determination unit and a preset basis A third determination unit configured to determine the first reference signal according to the sequence, and configured to transmit the first reference signal determined by the third determination unit to the second user equipment. And a transmission unit.

  Referring to the third aspect, in the implementation manner of the third aspect, the user equipment is configured to receive a request transmitted by the second user equipment and carrying the first identifier. The first determination unit is specifically configured to determine the first identifier according to the first identifier carried in the request received by the receiving unit.

Referring to the third aspect or the above-described execution method of the third aspect, in another execution method of the third aspect, the user equipment receives a request transmitted by the second user equipment. The request further includes a configured receiving unit, and the request carries a first identifier.

  Referring to any one of the third aspect, or the above-described execution method of the third aspect, in another execution method of the third aspect, the first determination unit is notably an identifier associated with the user equipment. The identifier is configured to be selected as the first identifier according to a preset rule.

  Referring to any one of the third aspect, or the above-described execution method of the third aspect, in another execution method of the third aspect, the third determination unit in particular has a first cyclic shift indicator. The first reference signal is acquired after performing the cyclic shift in the basic sequence according to the configuration.

With reference to the third aspect, or any one of the above-described execution methods of the third aspect, in the second execution method of the third aspect, in particular, n second determination units are selected. Is configured to determine the kth cyclic shift indication as the first cyclic shift indication among the cyclic shift indications to be taken, and n is the number of cyclic shift indications to be selected , M ₁ are values determined based on the first identifier, and k = mod (m ₁ , n).

With reference to any one of the third aspects, or the above-described execution scheme of the third aspect, in another execution scheme of the third aspect, the first identifier comprises one identifier of the user equipment. , M ₁ is equal to the value of the first identifier.

Referring to any one of the third aspect, or the above-described execution method of the third aspect, in another execution method of the third aspect, the first identifier comprises at least two identifiers of the user equipment. Including, m ₁ is a value determined based on the values of at least two identifiers according to a preset operation rule.

  With reference to any one of the third aspect, or the above-described execution method of the third aspect, in another execution method of the third aspect, the second determination unit in particular has a value of the first identifier. , And the value of the first parameter of the resource used to transmit the first reference signal, the first cyclic shift indication is configured to be determined.

With reference to the third aspect, or any one of the above-described execution methods of the third aspect, in the second execution method of the third aspect, in particular, n second determination units are selected. It is further configured to determine the k th cyclic shift indication as the first cyclic shift indication among the cyclic shift indications to be, where n is the number of cyclic shift indications to be selected. Yes, m ₂ is a value determined based on the value of the first identifier and the value of the first parameter in accordance with a preset operation rule, and k = mod (m ₂ , n).

  Referring to any one of the third aspect, or the above-described execution method of the third aspect, in another execution method of the third aspect, the first parameter is the following parameter corresponding to the resource: One or more of a frame number, a subframe number, a physical resource block number, or a bandwidth are included.

  With reference to any one of the third aspect, or the above-described execution method of the third aspect, in another execution method of the third aspect, the second determination unit in particular has a value of the first identifier. , Further configured to determine a first cyclic shift indication according to a value of the first parameter and a first offset value, the first offset value being a cell identifier value of a cell in which the user equipment is located, It is an identifier value of the D2D cluster to which the user equipment belongs, or an offset value configured by the first communication device.

  With reference to any one of the third aspect, or the above-described execution method of the third aspect, in another execution method of the third aspect, the second determination unit in particular has a value of the first identifier. And a first cyclic shift indication according to the first offset value, wherein the first offset value is a cell identifier value of a cell in which the user equipment is located, an identifier value of a D2D cluster to which the user equipment belongs. Or an offset value configured by the first communication device.

  Referring to any one of the third aspect or the above-described execution method of the third aspect, in another execution method of the third aspect, the first identifier is the following identifier of the user equipment: D2D Including one or more of identifier, IMSI, TMSI, D2D user group identifier, service type identifier, or D2D cluster identifier, the D2D user group identifier is used to indicate the D2D user group to which the user equipment belongs, The service type identifier is used to indicate the service type provided by the user equipment.

According to a fourth aspect, selected according to a first determination unit configured to determine a first identifier associated with a first user equipment, and a first identifier determined by the first determination unit. A second determination unit configured to determine a first cyclic shift indication from the cyclic shift indication to be determined; a first cyclic shift indication determined by the second determination unit and the presetting A third determination unit configured to determine a second reference signal according to the generated basic sequence; and a receiving unit configured to receive the first reference signal transmitted through the channel, The first reference signal is transmitted by the first user equipment, the second unit determined by the receiving unit and the third determining unit. According to a first reference signal received by the irradiation signal and receiving unit, a user equipment comprising a channel sounding unit that is configured to perform channel sounding on the channel is provided.

  Referring to the fourth aspect, in the method of execution of the fourth aspect, the user equipment further includes a transmission unit, and the transmission unit transmits a request to carry the first identifier to the first user equipment. The first determining unit is particularly configured to determine the first identifier according to the request transmitted by the transmitting unit and in accordance with the request to carry the first identifier.

With reference to the fourth aspect or the above-described execution method of the fourth aspect, in another execution method of the fourth aspect, the user equipment is configured to send a request to the first user equipment The request further includes a sending unit, and the request carries a first identifier.

  Referring to any one of the fourth aspect, or the above-described execution scheme of the fourth aspect, in another execution scheme of the fourth aspect, the third decision unit in particular has a first cyclic shift indicator. The second reference signal is obtained after performing the cyclic shift in the basic sequence according to the configuration.

Referring to any one of the fourth aspect, or the above-described execution method of the fourth aspect, in the second execution method of the fourth aspect, in particular, the second determination unit is selected n. Is configured to determine the kth cyclic shift indication as the first cyclic shift indication among the cyclic shift indications to be taken, and n is the number of cyclic shift indications to be selected , M ₁ are values determined based on the first identifier, and k = mod (m ₁ , n).

With reference to any one of the fourth aspect, or the above-described execution scheme of the fourth aspect, in another execution scheme of the fourth aspect, the first identifier is one of the first user equipment Including an identifier, m ₁ is equal to the value of the first identifier.

With reference to any one of the fourth aspect, or the above-described execution scheme of the fourth aspect, in another execution scheme of the fourth aspect, the first identifier is at least 2 of the first user equipment. M ₁ is a value determined based on the value of at least two identifiers according to a pre-set operational rule.

  Referring to any one of the fourth aspect, or the above-described execution method of the fourth aspect, in the other execution method of the fourth aspect, the second determination unit is notably the value of the first identifier. , And the value of the first parameter of the resource used to transmit the first reference signal, the first cyclic shift indication is configured to be determined.

Referring to any one of the fourth aspect, or the above-described execution method of the fourth aspect, in the second execution method of the fourth aspect, in particular, the second determination unit is selected n. It is further configured to determine the k th cyclic shift indication as the first cyclic shift indication among the cyclic shift indications to be, where n is the number of cyclic shift indications to be selected. Yes, m ₂ is a value determined based on the value of the first identifier and the value of the first parameter in accordance with a preset operation rule, and k = mod (m ₂ , n).

  Referring to any one of the fourth aspect or the above-described execution method of the fourth aspect, in another execution method of the fourth aspect, the first parameter is the following parameter corresponding to the resource: One or more of a frame number, a subframe number, a physical resource block number, or a bandwidth are included.

  Referring to any one of the fourth aspect, or the above-described execution method of the fourth aspect, in the other execution method of the fourth aspect, the second determination unit is notably the value of the first identifier. , Further configured to determine a first cyclic shift indication according to the value of the first parameter and the first offset value, wherein the first offset value is a cell of a cell in which the first user equipment is located. The identifier value, the identifier value of the D2D cluster to which the first user equipment belongs, or the offset value configured by the first communication device.

  Referring to any one of the fourth aspect, or the above-described execution method of the fourth aspect, in the other execution method of the fourth aspect, the second determination unit is notably the value of the first identifier. And a first cyclic shift indication according to the first offset value, wherein the first offset value is the cell identifier value of the cell in which the first user equipment is located, the first user equipment Is the identifier value of the D2D cluster to which the device belongs, or the offset value configured by the first communication device.

  Referring to any one of the fourth aspect, or the above-described execution method of the fourth aspect, in another execution method of the fourth aspect, the first identifier is the following for the first user equipment: Including one or more of an identifier, a D2D identifier, an IMSI, a TMSI, a D2D user group identifier, a service type identifier, or a D2D cluster identifier, and the D2D user group identifier indicates a D2D user group to which the first user equipment belongs. Used to indicate, the service type identifier is used to indicate the service type provided by the first user equipment.

  In an embodiment of the present invention, the first user equipment selects the first cyclic shift indication according to the first identifier associated with the first user equipment, the first cyclic shift indication and the preset. Based on the basic sequence, a first reference signal is generated, and then the first reference signal is transmitted to the second user equipment, thereby performing reference signal transmission in D2D communication.

  To describe the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments of the present invention. Apparently, the accompanying drawings in the following description show only some embodiments of the present invention, and those skilled in the art can still derive other drawings from these accompanying drawings without creative efforts. it can.

3 is a schematic flowchart of a reference signal transmission method according to an embodiment of the present invention. 6 is a schematic flowchart of a reference signal transmission method according to another embodiment of the present invention; FIG. 3 is a schematic block diagram of a user equipment according to an embodiment of the present invention. FIG. 3 is a schematic block diagram of a user equipment according to an embodiment of the present invention. FIG. 3 is a schematic block diagram of a user equipment according to an embodiment of the present invention. FIG. 3 is a schematic block diagram of a user equipment according to an embodiment of the present invention.

  The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

  The technical solutions of the present invention include: Global System for Mobile Communications (English: Global System for Mobile communications, GSM for short), Code Division Multiple Access (English: Code Division Multiple Access, CDMA for short), Wideband Code Division Multiplexing. Access (English: Wideband Code Division Multiple Access, abbreviated as WCDMA) system, General Packet Radio Service (English: General Packet Radio Service, abbreviated as GPRS), LTE System, Long Term Evolution Advanced (English: Long term Evd. LT It should be understood that the present invention may be applied to various communication systems such as EA) systems, as well as universal mobile telecommunications systems (UMTS for short).

  In an embodiment of the present invention, a user equipment includes a mobile station (English: Mobile Station, MS for short), a mobile terminal (English: Mobile Terminal), a mobile phone (English: Mobile Telephone), a handset (English: handset), and It should be understood that it includes, but is not limited to, portable equipment (English: portable equipment) and the like. User equipment may communicate with one or more core networks by using a radio access network (English: Radio Access Network, RAN for short). For example, the user equipment may be a mobile phone (or referred to as a “cellular” phone) or a computer with wireless communication capabilities, and the user equipment may further be portable, pocket-sized, handheld, built-in computer, or in-vehicle It may be a mobile device.

  In the embodiment of the present invention, the base station may be a base station in GSM or CDMA (English: Base Transceiver Station, abbreviated as BTS), may be a base station in WCDMA (Node B), It may be an evolved NodeB (English: evolved NodeB, eNB or e-NodeB for short) in LTE, and is not limited in the embodiment of the present invention.

  In LTE, user equipment uses uplink reference signals to perform channel sounding. The uplink reference signal may be a demodulation reference signal (English: Demodulation Reference Signal, abbreviated as DMRS), or may be a sounding reference signal (English: Sounding Reference Signal, abbreviated as SRS). When the user equipment transmits an uplink signal, the user equipment selects a cyclic shift indication from a plurality of cyclic shift indications to be selected, and cycles in a basic sequence according to the selected cyclic shift indication. A shift is performed to generate a reference signal. Reference signals generated according to different cyclic shift indications are orthogonal to each other. Thus, interference between reference signals transmitted on the same time-frequency resource is avoided.

  Reference signal transmission in D2D communication may be referred to a reference signal transmission method in LTE uplink. In particular, similar to the scheme described above for setting the cyclic shift indication to be selected in order to avoid interference between reference signals transmitted between user equipments using the same time-frequency resource. This scheme may be used instead for design purposes. For example, when 8 cyclic shift indications are pre-configured and two user equipments located at the transmitting end transmit reference signals on the same time-frequency resource, each of the two user equipments has 8 One of the cyclic shift indications may be randomly selected to generate the reference signal. In accordance with this design scheme, in D2D communication, the probability of interference occurring between reference signals transmitted by two user equipments on the same time-frequency resource is significantly reduced.

  However, as shown in the example above, when two user equipments select the same cyclic shift indication, the reference signals transmitted by the two user equipments still interfere with each other and the probability is 1 / 64. Based on the foregoing, embodiments of the present invention provide a reference signal transmission method for further reducing interference.

  FIG. 1 is a schematic flowchart of a reference signal transmission method according to an embodiment of the present invention. The method in FIG. 1 may be performed by a first user equipment.

  110. The first user equipment determines a first identifier associated with the first user equipment.

  The first identifier may be an identifier specifically configured for at least one user equipment including the first user equipment. In particular, the first identifier may be an identifier specifically configured for the first user equipment. For example, the first identifier is the following identifier, the D2D identifier of the first user equipment, an international mobile subscriber identity number (English: International Mobile Subscriber Identity, abbreviated IMSI), or a temporary mobile subscriber identity number (English: One or more of Temporary Mobile Subscriber Identity (abbreviated as TMSI). Alternatively, the first identifier may be a joint identifier configured for the same group including the first user equipment or the same type of user equipment. For example, the first identifier is the following identifier, the D2D user group identifier of the D2D user group to which the first user equipment belongs, the service type identifier of the service type provided by the first user equipment, or the first user equipment May include one or more of the D2D cluster identifiers of the D2D clusters to which the belongs.

  120. The first user equipment determines a first cyclic shift indication from the cyclic shift indication to be selected according to the first identifier.

  The first cyclic shift indication can be, for example, one cyclic shift to be selected, which can be the second cyclic shift indication among the eight cyclic shift indications to be selected. It should be understood that this is an indication.

  130. The first user equipment determines the first reference signal according to the first cyclic shift indication and the preset basic sequence.

  It should be understood that the reference signals generated based on different cyclic shift indications among the cyclic shift indications to be selected are orthogonal. In particular, when two user equipments (user equipment 1 and user equipment 2) transmit a reference signal on the same time-frequency resource, the cyclic shift indications in which the reference signals transmitted by the user equipment 1 and the user equipment 2 are different. The reference signals transmitted by the user equipment 1 and the user equipment 2 are orthogonal and do not interfere with each other.

  It should be understood that the base sequence may be pre-configured and multiple cyclic shift indications are configured for the base sequence. When the user equipment as the transmitting end selects the cyclic shift indication, the user equipment may perform the cyclic shift in the basic sequence according to the cyclic shift indication to generate the reference signal.

  This embodiment of the present invention does not place a specific limit on the number of cyclic shift indications that will be selected, for example, the number may be 8, 10, or any other number. It should also be understood.

  It should be noted that the first identifier may be one or more identifiers associated with the first user equipment. For example, the first identifier may be a D2D identifier of a first user equipment, or the first identifier includes a D2D identifier and a D2D user group identifier of the first user equipment.

  140. The first user equipment transmits a first reference signal to the second user equipment.

  In this embodiment of the invention, the first user equipment selects a first cyclic shift indication according to a first identifier associated with the first user equipment, and the first cyclic shift indication and presetting. Based on the generated basic sequence, a first reference signal is generated, and then the first reference signal is transmitted to the second user equipment, thereby performing reference signal transmission in D2D communication.

  Furthermore, the first user equipment selects the cyclic shift indication according to the first identifier of the first user equipment. The first identifier is associated with the first user equipment, and the first identifiers of the different user equipment are generally different from each other. Therefore, the probability that different user equipments select the same cyclic shift indication based on the first identifier of the different user equipments is low. Therefore, the probability that a collision will occur between the generated reference signals is low, and interference between reference signals transmitted between user equipments in D2D communication is reduced.

  It should be understood that the reference signal may be a DMRS, or may be another reference signal, such as an SRS, and this embodiment of the present invention does not place any particular restrictions on them. In particular, when the reference signal is DMRS, the DMRS is generally carried and transmitted in a digital signal transmitted between user equipment, i.e., the DMRS and the digital signal are transmitted on the same frequency resource. When the reference signal is SRS, the SRS may be transmitted according to the SRS parameters that are predefined and used to indicate the resources occupied by the SRS, where the SRS parameters are the sounding bandwidth, the SRS transmission interval, And frequency hopping mode.

  Optionally, the first user equipment may perform the calculation according to the value of the first identifier and according to a predetermined operating rule, with the calculation result and the cyclic shift indication to be selected. There is a one-to-one correspondence between them. In particular, n cyclic shift indications may be preset and a modulo operation may be performed on the value of the first identifier of the first user equipment, with the remainder changing from 0 to n−1 (0 and n-1). A correspondence is then set between the n remainder results and the n cyclic shift indications. Further, when the first cyclic shift indication is selected, the first cyclic shift indication is used to perform the cyclic shift in the basic sequence, and the first reference signal (also referred to as the first reference sequence). May be generated).

  It should be understood that the modulo operation is only a predetermined operation rule execution method. In fact, another rule of operation may be used. For example, if the value of the first identifier is 20 and n = 8, the (2 + 0) th cyclic shift indication is selected as the first cyclic shift indication among the n cyclic shift indications. The Similarly, when the value of the first identifier is 211, the (2 + 1 + 1) th cyclic shift indication is selected as the first cyclic shift indication. When the first identifier includes two identifiers (separately identifier 1 and identifier 2), the value of identifier 1 is 30, and the value of identifier 2 is 14, the (3 + 0 + 1 + 4) th cyclic shift indicator. Is selected as the first cyclic shift indication.

  In this embodiment of the invention, the first user equipment selects the cyclic shift indication according to the value of the first identifier of the first user equipment. The first identifier is associated with the first user equipment, and the values of the first identifiers of different user equipment are generally different from each other. Therefore, the probability that different user equipments select the same cyclic shift indication based on the value of the first identifier of the different user equipments is low. Therefore, the probability that a collision will occur between the generated reference signals is low, and interference between reference signals transmitted between user equipments in D2D communication is reduced.

Optionally, in another embodiment, step 120 comprises the first cyclic shift of the kth cyclic shift indication among the n cyclic shift indications to be selected by the first user equipment. Including the step of determining as an indication, n is the number of cyclic shift indications to be selected, m ₁ is a value determined based on the first identifier, and k = mod (m ₁ , n).

  It should be understood that mod (x, y) indicates the remainder obtained by dividing x by y.

Optional scheme 1: The first identifier includes one identifier of the first user equipment, and m ₁ is equal to the value of the first identifier.

For example, if the first identifier is a D2D identifier, the value of the D2D identifier is ID_d2d, n = 8, m ₁ = ID_d2d, and k = mod (ID_d2d, 8).

In another example, if the first identifier is a D2D user group identifier, the value of the D2D user group identifier is ID_d2d_group, n = 8, m ₁ = ID_d2d_group, and k = mod (ID_d2d_group, 8 ).

In another example, if the first identifier is a service type identifier, the value of the service type identifier is ID_d2d_service, n = 8, m ₁ = ID_d2d_service, and k = mod (ID_d2d_service, 8) is there.

In another example, if the first identifier is IMSI, n = 8, m ₁ = IMSI, and k = mod (IMSI, 8).

In another example, if the first identifier is TMSI, n = 8, m ₁ = TMSI, and k = mod (TMSI, 8).

Optional scheme 2: The first identifier includes at least two identifiers of the first user equipment, and m ₁ is a value determined based on the values of the at least two identifiers according to a preset operation rule. is there.

  In this optional scheme, multiple identifiers associated with the first user equipment are considered simultaneously, thereby further reducing the probability that different user equipments will select the same cyclic shift indication, and between user equipments. The interference between the reference signals transmitted in is further reduced.

For example, the first identifier includes a D2D identifier and a D2D user group identifier. The value of the D2D identifier is ID_d2d. The value of the D2D user group identifier is ID_d2d_group. If n = 8 and the preset action rule is adding two identifier values, then m ₁ = ID_d2d + ID_d2d_group and k = mod (ID_d2d + ID_d2d_group, 8).

It should be understood that the optional scheme described above is only used as an illustrative example. In practice, n may be selected as any natural number greater than or equal to two. In addition, if the first identifier is one identifier of the first user equipment, m ₁ may be obtained by using a pre-configured operation rule. For example, if the value of the first identifier is a hexadecimal number, the value of the first identifier may be converted to a decimal value and then a modulo operation is performed. When the first identifier includes a plurality of identifiers of the first user equipment, the preset operation rules described above include, but are not limited to, those that have been added. For example, different identifier values may be multiplied by different identifier weight values, and then the multiplication result is added.

  Optionally, in an embodiment, step 120 includes determining a first cyclic shift indication by a first user equipment according to a first identifier value and a first offset value, The offset value is configured by the cell identifier (or cell ID) value of the cell in which the first user equipment is located, the identifier value of the D2D cluster to which the first user equipment belongs, or the first communication device. Offset value.

  It is noted that when the first offset value is the cell identifier value of the cell in which the first user equipment is located, the first user equipment and the second user equipment may be located in the same cell. Should be. Thus, the second user equipment can obtain the first offset value by using the cell identifier value of the cell in which the second user equipment is located.

When the first offset value is the identifier value of the D2D cluster to which the first user equipment belongs , the first user equipment and the second user equipment may be located in the same D2D cluster. Accordingly, the second user equipment can obtain the first offset value by using the identifier of the D2D cluster in which the second user equipment is located.

  Alternatively, the first offset value may be an offset value configured by the first communication device. The first communication device may be a base station, and the base station configures offset values for the first user equipment and the second user equipment simultaneously. When the first user equipment and the second user equipment are located in the same D2D cluster, the first communication device may be a cluster head of the D2D cluster.

  For example, the offset value is indicated as N_offset. The first cyclic shift indication may be the [mod (ID_d2d + N_offset, 8)] th cyclic shift indication among the eight cyclic shift indications to be selected, or the first cyclic shift indication. The shift indication may be the [mod (ID_d2d + ID_d2d_group + N_offset, 8)] th cyclic shift indication among the eight cyclic shift indications to be selected. The purpose of this embodiment of the present invention is to reduce the probability that user equipment will select the same cyclic shift indication, but does not limit the specific operating scheme. In fact, all modes of operation that can achieve the objective will fall within the protection scope of this embodiment of the invention.

  Optionally, in another embodiment, step 120 is performed by the first user equipment according to the first parameter value and the first parameter of the resource used to transmit the first reference signal. Determining a cyclic shift indication of one.

  It should be understood that the first parameter may be used to indicate the time domain location and / or frequency domain location of the resource used to transmit the first reference signal.

  Optionally, the first parameter may be a parameter of a resource for transmitting the first data, and the first data is data transmitted together with the first reference signal. For example, if the first reference signal is DMRS, and DMRS is generally mixed and transmitted with data transmitted between user equipments, the first parameter is the resource for transmitting the transmitted data. It may be a parameter.

In this embodiment of the invention, the first user equipment circulates according to the first parameter value of the first user equipment and the first parameter of the resources used to transmit the first reference signal. Select shift indication. The first identifier is associated with the first user equipment, and the values of the first identifiers of different user equipment are generally different from each other. Therefore, the probability that different user equipments select the same cyclic shift indication based on the value of the first identifier of the different user equipments is low. Therefore, the probability of collision between the generated reference signal is generated is low, the interference between the reference signal transmitted by the user equipment in D2D communication is reduced.

Channel estimation performance using reference signals determined according to different cyclic shift indications may be good or bad. The channel estimation performance using the reference signal determined by the first user equipment according to the first identifier may be relatively poor. Since the first reference signal is determined only according to the first identifier and the preset operating rule and the first identifier is relatively fixed, the selected first cyclic shift indication is relatively fixed. The channel estimation performance using the first reference signal determined over time may be relatively poor. In this embodiment of the present invention, when the first cyclic shift indication is selected, the first identifier of the first user equipment is not only taken into account, but also the resources used to transmit the reference signal The first parameter is also considered. The resource for transmitting the reference signal changes in real time, so that the first cyclic shift indication selected by the same user equipment is not fixed, and the first reference signal determined every time is changed. Avoid cases where the channel estimation performance used is relatively poor.

  The resource for transmitting the first reference signal may be a time domain resource and / or a frequency domain resource. The first parameter of the resource used to transmit the first reference signal includes the following parameters corresponding to the resource, frame number, subframe number, physical resource block (English: Physical Resource Block, abbreviated as PRB) ) One or more of numbers, or bandwidths.

Optionally, in another embodiment, a first cyclic shift according to a first parameter value used by the first user equipment to transmit a first identifier value and a first reference signal. The step of determining an indication is a step of determining the k-th cyclic shift indication among the n cyclic shift indications to be selected by the first user equipment as the first cyclic shift indication. Where n is the number of cyclic shift indications to be selected and m ₂ is a value determined based on the value of the first identifier and the first parameter according to a preset operating rule And k = mod (m ₂ , n).

  In this embodiment of the invention, the first user equipment circulates according to the first parameter value of the first user equipment and the first parameter of the resources used to transmit the first reference signal. Select shift indication. The first identifier is associated with the first user equipment, and the values of the first identifiers of different user equipment are generally different from each other. Therefore, the probability that different user equipments select the same cyclic shift indication based on different first identifier values is low. Therefore, the probability that a collision will occur between the generated reference signals is low, and interference between reference signals transmitted between UEs in D2D communication is reduced.

  It is used as an illustrative example that n = 8, the first identifier is a D2D identifier, and the value of the D2D identifier is ID_d2d.

Optional scheme 1: The first parameter is the number of the subframe occupied by the first reference signal, and the subframe number is denoted as N_subframe. When the preset operation rule is m ₂ = ID_d2d + N_subframe, k = mod (ID_d2d + N_subframe, 8).

Optional scheme 2: The first parameter is the number of the frame occupied by the first reference signal, and the frame number is denoted as N_frame. When the preset operation rule is m ₂ = ID_d2d + N_frame, k = mod (ID_d2d + N_frame, 8).

Optional scheme 3: The first parameter includes the subframe and frame number occupied by the first reference signal, the subframe number is denoted as N_subframe, and the frame number is denoted as N_frame. When the preset operation rule is m ₂ = ID_d2d + N_frame * 10 + N_subframe, k = mod (ID_d2d + N_frame * 10 + N_subframe, 8).

Optional scheme 4: The first parameter includes the subframe and PRB occupied by the first reference signal, and the bandwidth number, the subframe number is denoted as N_subframe, and the bandwidth is N_bandwidth The PRB number is shown as N_PRB. When the preset operation rule is m ₂ = ID_d2d + N_subframe * N_bandwidth + N_PRB, k = mod (ID_d2d + N_subframe * N_bandwidth + N_PRB, 8).

Optional scheme 5: The first parameter includes the number of frames and PRBs occupied by the first reference signal, and the bandwidth, the frame number is shown as N_frame and the bandwidth is shown as N_bandwidth. , PRB number is indicated as N_PRB. When the preset operation rule is m ₂ = ID_d2d + N_frame * N_bandwidth + N_PRB, k = mod (ID_d2d + N_frame * N_bandwidth + N_PRB, 8).

Optional scheme 6: The first parameter includes the number of frames, subframes and PRBs occupied by the first reference signal, and the bandwidth, the frame number is denoted as N_frame, and the subframe number is It is indicated as N_subframe, the bandwidth is indicated as N_bandwidth, and the PRB number is indicated as N_PRB. If the preset operation rule is m ₂ = ID_d2d + (N_frame * 10 + N_subframe) * N_bandwidth + N_PRB, then k = mod (ID_d2d + (N_frame * 10 + N_subframe) * N_bandwidth + N_PRB, 8_PRB, 8).

  It should be understood that the optional scheme described above is only used as an illustrative example. In practice, n may be selected as any natural number greater than or equal to two. In this embodiment of the invention, ID_d2d may be replaced with any of the first identifiers described above, for example, ID_d2d is replaced with a combination of ID_d2d_group and ID_d2d_service.

  Optionally, the first cyclic shift indication is determined by the first user equipment according to the value of the first identifier and the first parameter of the resource used to transmit the first reference signal. The step includes determining a first cyclic shift indication by a first user equipment according to a first identifier value, a first parameter value, and a first offset value, wherein the first offset The value is the cell identifier value of the cell in which the first user equipment is located, the identifier value of the D2D cluster to which the first user equipment belongs, or the offset value configured by the first communication device.

  It is noted that the first offset value is the cell identifier value of the cell in which the first user equipment is located, and the first user equipment and the second user equipment may be located in the same cell. Should. Accordingly, the second user equipment can obtain the first offset value by using the cell identifier of the cell in which the second user equipment is located.

When the first offset value is an identifier of the D2D cluster to which the first user equipment belongs , the first user equipment and the second user equipment may be located in the same D2D cluster. Accordingly, the second user equipment can obtain the first offset value by using the identifier of the D2D cluster in which the second user equipment is located.

  Alternatively, the first offset value may be an offset value configured by the first communication device. The first communication device may be a base station, and the base station configures offset values for the first user equipment and the second user equipment simultaneously. When the first user equipment and the second user equipment are located in the same D2D cluster, the first communication device may be a cluster head of the D2D cluster.

  For example, the offset value is indicated as N_offset. The first cyclic shift indication may be [mod (ID_d2d + (N_frame * 10 + N_subframe) * N_bandwidth + N_PRB + N_offset, 8)]-th cyclic shift indication among the eight cyclic shift indications to be selected. Alternatively, the first cyclic shift indication may be the [mod (ID_d2d + N_frame * 10 + N_subframe + N_offset, 8)] th cyclic shift indication among the eight cyclic shift indications to be selected. The purpose of this embodiment of the present invention is to reduce the probability that different user equipments will select the same cyclic shift indication, but is not limited to a particular mode of operation. In fact, all modes of operation that can achieve the objective will fall within the protection scope of this embodiment of the invention.

  Optionally, step 110 includes determining the first identifier according to the first identifier carried by the first user equipment in the received request sent by the second user equipment.

  In particular, the second user equipment may send the request (eg, the request may be a discovery signal request) directly to the surrounding user equipment and add the first identifier to the request. Instead, the second user equipment sends a request to the base station, the base station sends a paging signal to user equipment around the second user equipment, and adds a first identifier to the paging signal. .

  If the second user equipment requests to search for a user equipment that can provide the first D2D service, the second user equipment sends a discovery signal request to the surrounding user equipment, and A D2D service type identifier corresponding to one D2D service is added to the discovery signal request. A first user equipment capable of providing a D2D service type receives a discovery signal request and generates a first reference signal according to the D2D service type identifier carried in the discovery signal request.

  Alternatively, if the second user equipment requests to search for a user equipment that can provide the first D2D service, the second user equipment sends a discovery signal request to the base station, and A D2D service type identifier corresponding to the first D2D service is added to the discovery signal request. After receiving the discovery signal request, the base station transmits a paging signal to user equipment around the second user equipment and adds a D2D service type identifier to the paging signal. A first user equipment capable of providing a D2D service type receives a discovery signal request and generates a first reference signal according to the D2D service type identifier carried in the discovery signal request.

  Optionally, step 110 includes selecting an identifier as a first identifier by a first user equipment according to a preset rule from an identifier associated with the first user equipment.

  In particular, the first user equipment has a plurality of identifiers associated with the first user equipment, and the first user equipment periodically transfers a reference signal. When the first user equipment is ready to transmit the reference signal, the first user equipment selects and selects an identifier randomly from a plurality of associated identifiers or according to a predetermined order. The identifier may be determined as the first cyclic shift indication.

  For example, the first user equipment can provide three service types. In order to allow surrounding user equipment requesting a service type from among the three service types to discover the first user equipment, the first user equipment periodically transmits a reference signal and references The signal carries a service type identifier of three service types in succession. The surrounding user equipment may demodulate the reference signal by the blind detection method.

  The above describes the reference signal transmission method in detail from the perspective of the first user equipment (reference signal transmission end) according to the embodiment of the present invention with reference to FIG. Hereinafter, with reference to FIG. 2, the reference signal transmission method will be described in detail from the viewpoint of the second user equipment (reference signal receiving end) according to the embodiment of the present invention.

  It is understood that the interaction, related features, functions, etc. of the first user equipment and the second user equipment described from the second user equipment side correspond to the explanation from the first user equipment side. Should be. For brevity, relevant explanations are omitted appropriately.

  FIG. 2 is a schematic flowchart of a reference signal transmission method according to another embodiment of the present invention. The method in FIG. 2 includes the following steps.

  210. The second user equipment determines a first identifier associated with the first user equipment.

  220. The second user equipment determines the first cyclic shift indication from the cyclic shift indication to be selected according to the first identifier.

  230. The second user equipment determines the second reference signal according to the first cyclic shift indication and the preset basic sequence.

  240. The second user equipment performs channel sounding on the channel according to the second reference signal and the received first reference signal transmitted over the channel, the first reference signal being the first user Sent by the device.

  It should be understood that the first reference signal is generated by the first user equipment based on the first identifier, and thus the first reference signal is identical to the second reference signal.

  In this embodiment of the invention, the second user equipment selects the first cyclic shift indication according to the first identifier associated with the first user equipment, the first cyclic shift indication and the presetting. Determining a second reference signal based on the generated basic sequence, and then performing channel sounding on the channel according to the second reference signal and the received first reference signal transmitted over the channel Thereby, reference signal transmission is executed in D2D communication. A technical solution is used, whereby the second user equipment does not need to use a blind detection scheme, the channel sounding complexity is reduced, and the energy consumption of the second user equipment is reduced.

  Optionally, in an embodiment, step 210 includes determining a first identifier according to a request transmitted by the second user equipment to the first user equipment and carrying the first identifier.

  When the second user equipment sends a request, the second user equipment adds a first identifier to the request. The first user equipment that receives the request selects a cyclic shift indication and generates a first reference signal by using the first identifier, and the second user equipment also receives the first identifier. The second user equipment selects a cyclic shift indication and which cyclic shift indication is used to generate the reference signal transmitted by the first user equipment. Generates a second reference signal, equivalent to that learned in advance, but does not need to be determined by a blind detection scheme, thereby significantly reducing the complexity of channel sounding performed by the second user equipment .

  Optionally, in another embodiment, step 230 obtains a second reference signal after performing a cyclic shift with a basic sequence preset by a second user equipment according to a first cyclic shift indication. Including the steps of:

Optionally, in another embodiment, step 220 comprises the first cyclic shift of the kth cyclic shift indication among the n cyclic shift indications to be selected by the second user equipment. N is the number of cyclic shift indications to be selected, m ₁ is a value determined based on the first identifier, and k = mod (m ₁ , n ).

Optionally, in another embodiment, the first identifier comprises one identifier of the first user equipment, and m ₁ is equal to the value of the first identifier.

Optionally, in another embodiment, the first identifier includes at least two identifiers of the first user equipment, and m ₁ is based on a value of at least two identifiers according to a pre-configured operating rule. It is the determined value.

  Optionally, in another embodiment, step 220 comprises the steps according to the first parameter value used by the second user equipment to transmit the first identifier value and the first reference signal. Determining a cyclic shift indication of one.

Optionally, in another embodiment, step 220 comprises the first cyclic shift of the kth cyclic shift indication among the n cyclic shift indications to be selected by the second user equipment. Determining as an indication, where n is the number of cyclic shift indications to be selected, and m ₂ is a first identifier value and a first parameter according to a pre-set operating rule. Is a value determined based on the value of k = mod (m ₂ , n).

  Optionally, in another embodiment, the first parameter includes one or more of the following parameters, frame number, subframe number, physical resource block number, or bandwidth corresponding to the resource.

  Optionally, in another embodiment, step 220 comprises a first cyclic shift indication by the second user equipment according to the first identifier value, the first parameter value, and the first offset value. The first offset value is configured by the cell identifier of the cell in which the first user equipment is located, the identifier value of the D2D cluster to which the first user equipment belongs, or the first communication device Offset value.

  Optionally, in another embodiment, step 220 includes determining a first cyclic shift indication by the second user equipment according to the value of the first identifier and the first offset value, The offset value of 1 is the cell identifier value of the cell where the first user equipment is located, the identifier value of the D2D cluster to which the first user equipment belongs, or the offset value configured by the first communication device.

  Optionally, in another embodiment, the first identifier is one of the following identifiers of the first user equipment: D2D identifier, IMSI, TMSI, D2D user group identifier, service type identifier, or D2D cluster identifier. The D2D user group identifier is used to indicate the D2D user group to which the first user equipment belongs, and the service type identifier is used to indicate the service type provided by the first user equipment. Is done.

  The above describes the reference signal transmission method according to the embodiment of the present invention in detail with reference to FIGS. Hereinafter, a user equipment according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 4.

  FIG. 3 is a schematic block diagram of a user equipment according to an embodiment of the present invention. A user device 300 in FIG. 3 corresponds to the first user device in FIGS. 1 and 2. The user equipment 300 includes a first determination unit 310, a second determination unit 320, a third determination unit 330, and a transmission unit 340.

  The first determination unit 310 is configured to determine a first identifier associated with the user equipment 300.

  The second determination unit 320 is configured to determine the first cyclic shift indication from the cyclic shift indication to be selected according to the first identifier determined by the first determination unit 310. .

  The third determination unit 330 is configured to determine the first reference signal according to the first cyclic shift indication determined by the second determination unit 320 and the preset basic sequence.

  The transmission unit 340 is configured to transmit the first reference signal determined by the third determination unit 330 to the second user equipment.

  In this embodiment of the present invention, the user equipment 300 selects a first cyclic shift indication according to a first identifier associated with the user equipment 300, the first cyclic shift indication and a preset basic sequence. To generate a first reference signal, and then transmit the first reference signal to the second user equipment, thereby performing reference signal transmission in D2D communication.

  Furthermore, the user equipment 300 selects the cyclic shift indication according to the first identifier of the user equipment 300. The first identifier is associated with the user equipment 300, and the first identifiers of different user equipment are generally different from one another. Therefore, the probability that different user equipments select the same cyclic shift indication based on the first identifier of the different user equipments is low. Therefore, the probability that a collision will occur between generated reference signals is low, and interference between reference signals transmitted between user equipments in D2D communication is reduced.

  Optionally, in an embodiment, the user equipment 300 further includes a receiving unit, the receiving unit is configured to receive a request transmitted by the second user equipment and carrying the first identifier, the first The determining unit 310 is particularly configured to determine the first identifier according to the first identifier carried in the request received by the receiving unit.

  Optionally, in another embodiment, the first determination unit 310 is specifically configured to select an identifier as the first identifier according to a preset rule from an identifier associated with the user equipment 300.

  Optionally, in another embodiment, the third determination unit 330 obtains the first reference signal after performing a cyclic shift with a pre-set basic sequence, in particular according to the first cyclic shift indication. Configured as follows.

Optionally, in another embodiment, the second decision unit 320 specifically replaces the kth cyclic shift indication among the n cyclic shift indications to be selected. N is the number of cyclic shift indications to be selected, m ₁ is a value determined based on the first identifier, and k = mod (m ₁ , N).

Optionally, in another embodiment, the first identifier comprises one identifier of user equipment 300 and m ₁ is equal to the value of the first identifier.

Optionally, in another embodiment, the first identifier includes at least two identifiers of user equipment 300, and m ₁ is determined based on a value of at least two identifiers according to a pre-configured operating rule. Value.

  Optionally, in another embodiment, the second determination unit 320 may be the first identifier according to the first identifier value and the first parameter of the resource used to transmit the first reference signal, among others. It is configured to determine the cyclic shift indication.

Optionally, in another embodiment, the second decision unit 320 specifically replaces the kth cyclic shift indication among the n cyclic shift indications to be selected. N is the number of cyclic shift indications to be selected, and m ₂ is the value of the first identifier and the first parameter according to a preset operating rule. The value is determined based on the value, and k = mod (m ₂ , n).

  Optionally, in another embodiment, the first parameter includes one or more of the following parameters corresponding to the resource: a frame number, a subframe number, a physical resource block number, or a bandwidth.

  Optionally, in another embodiment, the second determination unit 320 specifically determines the first cyclic shift indication according to the value of the first identifier, the value of the first parameter, and the first offset value. The first offset value is a cell identifier value of a cell in which the user equipment 300 is located, an identifier value of a D2D cluster to which the user equipment 300 belongs, or an offset value configured by the first communication device. is there.

  Optionally, in another embodiment, the second determination unit 320 is further configured to determine a first cyclic shift indication, in particular according to the value of the first identifier and the first offset value, The offset value of 1 is the cell identifier value of the cell in which the user equipment 300 is located, the identifier value of the D2D cluster to which the user equipment 300 belongs, or the offset value configured by the first communication device.

  Optionally, in another embodiment, the first identifier comprises the following identifier of user equipment 300: D2D identifier, IMSI, TMSI, D2D user group identifier, service type identifier, or D2D cluster identifier, and D2D user group The identifier is used to indicate the D2D user group to which the user equipment 300 belongs, and the service type identifier is used to indicate the service type provided by the user equipment 300.

  FIG. 4 is a schematic block diagram of a user equipment according to an embodiment of the present invention. A user device 400 in FIG. 4 corresponds to the second user device in FIGS. 1 and 2. User equipment 400 includes a first determination unit 410, a second determination unit 420, a third determination unit 430, a channel sounding unit 440, and a reception unit 450.

  The first determination unit 410 is configured to determine a first identifier associated with the first user equipment.

  The second determination unit 420 is configured to determine the first cyclic shift indication from the cyclic shift indication to be selected according to the first identifier determined by the first determination unit 410. .

  The third determination unit 430 is configured to determine the second reference signal according to the first cyclic shift indication determined by the second determination unit 420 and the preset basic sequence.

  The receiving unit 450 is configured to receive a first reference signal transmitted through the channel, and the first reference signal is transmitted by the first user equipment.

  The channel sounding unit 440 is configured to perform channel sounding on the channel according to the second reference signal determined by the third determination unit 430 and the first reference signal received by the receiving unit 450.

  In this embodiment of the invention, the user equipment 400 selects a first cyclic shift indication according to a first identifier associated with the first user equipment, the first cyclic shift indication and the preset Based on the basic sequence, determine a second reference signal, and then perform channel sounding on the channel according to the second reference signal and the received first reference signal transmitted over the channel, thereby The reference signal transmission is executed in the D2D communication. A technical solution is used, whereby the user equipment 400 does not need to use a blind detection scheme, the channel sounding complexity is reduced, and the energy consumption of the user equipment 400 is reduced.

  Optionally, in an embodiment, user equipment 400 further comprises a transmission unit, wherein the transmission unit is configured to send a request to carry the first identifier to the first user equipment, the first determination The unit 410 is specifically configured to determine the first identifier according to a request transmitted by the transmitting unit and carrying the first identifier.

  Optionally, in another embodiment, the third decision unit 430 obtains the second reference signal after performing a cyclic shift with a preset basic sequence, in particular according to the first cyclic shift indication. Configured as follows.

Optionally, in another embodiment, the second decision unit 420 specifically replaces the kth cyclic shift indication among the n cyclic shift indications to be selected as the first cyclic shift indication. N is the number of cyclic shift indications to be selected, m ₁ is a value determined based on the first identifier, and k = mod (m ₁ , N).

Optionally, in another embodiment, the first identifier comprises one identifier of the first user equipment, and m ₁ is equal to the value of the first identifier.

Optionally, in another embodiment, the first identifier includes at least two identifiers of the first user equipment, and m ₁ is based on a value of at least two identifiers according to a pre-configured operating rule. It is the determined value.

  Optionally, in another embodiment, the second determination unit 420 specifically determines the first identifier value and the first parameter value of the resource used to transmit the first reference signal according to the first parameter value. It is configured to determine one cyclic shift indication.

Optionally, in another embodiment, the second decision unit 420 specifically replaces the kth cyclic shift indication among the n cyclic shift indications to be selected as the first cyclic shift indication. And n is the number of cyclic shift indications to be selected, and m ₂ is the first identifier value and the first parameter according to a preset operating rule. Is a value determined based on the value of k = mod (m ₂ , n).

  Optionally, in another embodiment, the first parameter includes one or more of the following parameters corresponding to the resource: a frame number, a subframe number, a physical resource block number, or a bandwidth.

  Optionally, in another embodiment, the second determination unit 420 specifically determines the first cyclic shift indication according to the value of the first identifier, the first parameter, and the first offset value. The first offset value is the cell identifier value of the cell in which the first user equipment is located, the identifier value of the D2D cluster to which the first user equipment belongs, or the offset configured by the first communication device Value.

  Optionally, in another embodiment, the second determination unit 420 is specifically configured to determine the first cyclic shift indication according to the value of the first identifier and the first offset value, and the first Is the cell identifier value of the cell in which the first user equipment is located, the identifier value of the D2D cluster to which the first user equipment belongs, or the offset value configured by the first communication device.

  Optionally, in another embodiment, the first identifier is one of the following identifiers of the first user equipment: D2D identifier, IMSI, TMSI, D2D user group identifier, service type identifier, or D2D cluster identifier Including one or more, the D2D user group identifier is used to indicate a D2D user group to which the first user equipment belongs, and the service type identifier is used to indicate a service type provided by the first user equipment. used.

  FIG. 5 is a schematic block diagram of user equipment according to an embodiment of the present invention. A user device 500 in FIG. 5 corresponds to the first user device in FIGS. 1 and 2. User equipment 500 includes a processor 510 and a transmitter 520.

  The processor 510 determines a first identifier associated with the user equipment 500, determines a first cyclic shift indication from the cyclic shift indication to be selected according to the first identifier, and a first The first reference signal is configured to be determined according to the cyclic shift indication and the preset basic sequence.

  The transmitter 520 is configured to transmit the first reference signal to the second user equipment.

  In this embodiment of the present invention, the cyclic shift indication to be selected is preset and the user equipment 500 selects the first cyclic shift indication according to a first identifier associated with the user equipment 500. And generating a first reference signal based on the first cyclic shift indication and the preset basic sequence, and then transmitting the first reference signal to the second user equipment, thereby D2D Reference signal transmission is executed in communication.

  Further, the user equipment 500 selects a cyclic shift indication according to the first identifier of the user equipment 500. The first identifier is associated with user equipment 500, and the first identifiers of different user equipment are generally different from one another. Therefore, the probability that different user equipments select the same cyclic shift indication based on the first identifier of the different user equipments is low. Therefore, the probability that a collision will occur between generated reference signals is low, and interference between reference signals transmitted between user equipments in D2D communication is reduced.

  Optionally, in an embodiment, user equipment 500 further includes a receiver configured to receive a request transmitted by the second user equipment and carrying the first identifier, processor 510 in particular The first identifier is configured to be determined according to the first identifier carried in the request received by the receiver.

  Optionally, in another embodiment, the processor 510 is specifically configured to select an identifier as a first identifier from an identifier associated with the user equipment 500 according to a preset rule.

  Optionally, in another embodiment, processor 510 is specifically configured to obtain a first reference signal after performing a cyclic shift with a pre-set basic sequence in accordance with a first cyclic shift indication. The

Optionally, in another embodiment, processor 510 specifically determines the kth cyclic shift indication as the first cyclic shift indication among the n cyclic shift indications to be selected. Where n is the number of cyclic shift indications to be selected, m ₁ is a value determined based on the first identifier, and k = mod (m ₁ , n) is there.

Optionally, in another embodiment, the first identifier comprises one identifier of user equipment 500 and m ₁ is equal to the value of the first identifier.

Optionally, in another embodiment, the first identifier includes at least two identifiers of user equipment 500, and m ₁ is determined based on a value of at least two identifiers according to a pre-configured operating rule. Value.

  Optionally, in another embodiment, processor 510 specifically includes a first cyclic shift indicator according to the value of the first identifier and the first parameter of the resource used to transmit the first reference signal. Configured to determine the application.

Optionally, in another embodiment, processor 510 specifically determines the kth cyclic shift indication as the first cyclic shift indication among the n cyclic shift indications to be selected. Where n is the number of cyclic shift indications to be selected and m ₂ is based on the value of the first identifier and the value of the first parameter according to a preset operating rule The determined value, k = mod (m ₂ , n).

  Optionally, in another embodiment, the first parameter includes one or more of the following parameters corresponding to the resource: a frame number, a subframe number, a physical resource block number, or a bandwidth.

  Optionally, in another embodiment, processor 510 specifically further determines a first cyclic shift indication according to a first identifier value, a first parameter value, and a first offset value, among others. The first offset value configured is a cell identifier value of a cell in which the user equipment 500 is located, an identifier value of a D2D cluster to which the user equipment 500 belongs, or an offset value configured by the first communication device.

  Optionally, in another embodiment, processor 510 is further configured to determine a first cyclic shift indication, particularly according to the value of the first identifier and the first offset value, wherein the first offset value Is the cell identifier value of the cell in which the user equipment 500 is located, the identifier value of the D2D cluster to which the user equipment 500 belongs, or the offset value configured by the first communication device.

  Optionally, in another embodiment, the first identifier is one of the following identifiers of user equipment 500: D2D identifier, IMSI, TMSI, D2D user group identifier, service type identifier, or D2D cluster identifier. Or a D2D user group identifier is used to indicate a D2D user group to which the user equipment 500 belongs, and a service type identifier is used to indicate a service type provided by the user equipment 500.

  FIG. 6 is a schematic block diagram of a user equipment according to an embodiment of the present invention. A user device 600 in FIG. 6 corresponds to the second user device in FIGS. 1 and 2. User equipment 600 includes a processor 610 and a receiver 620.

  The processor 610 determines a first identifier associated with the first user equipment, determines a first cyclic shift indication from the cyclic shift indication to be selected according to the first identifier, and a second The second reference signal is configured to be determined according to one cyclic shift indication and a preset basic sequence.

  Receiver 620 is configured to receive a first reference signal transmitted over a channel, and the first reference signal is transmitted by a first user equipment.

  The processor 610 is further configured to perform channel sounding on the channel according to the determined second reference signal and the first reference signal received by the receiver 620.

  In this embodiment of the invention, user equipment 600 selects a first cyclic shift indication according to a first identifier associated with the first user equipment, the first cyclic shift indication and the preset Generating a second reference signal based on the base sequence and then performing channel sounding on the channel according to the second reference signal and the received first reference signal transmitted over the channel, Thus, reference signal transmission is executed in D2D communication. A technical solution is used, whereby the user equipment 600 does not need to use a blind detection scheme, the channel sounding complexity is reduced, and the energy consumption of the user equipment 600 is reduced.

  Optionally, in an embodiment, the user equipment 600 further comprises a transmitter configured to send a request to carry the first identifier to the first user equipment, and the processor 610 is notably configured by the transmitter. The first identifier is configured to be determined according to the transmitted and request to carry the first identifier.

  Optionally, in another embodiment, processor 610 is specifically configured to obtain a second reference signal after performing a cyclic shift with a pre-set basic sequence in accordance with a first cyclic shift indication. The

Optionally, in another embodiment, processor 610 specifically determines the kth cyclic shift indication as the first cyclic shift indication among the n cyclic shift indications to be selected. Where n is the number of cyclic shift indications to be selected, m ₁ is a value determined based on the first identifier, and k = mod (m ₁ , n) is there.

Optionally, in another embodiment, the first identifier comprises one identifier of the first user equipment, and m ₁ is equal to the value of the first identifier.

Optionally, in another embodiment, the first identifier includes at least two identifiers of the first user equipment, and m ₁ is based on a value of at least two identifiers according to a pre-configured operating rule. It is the determined value.

  Optionally, in another embodiment, the processor 610 specifically performs the first cycle according to the value of the first identifier and the value of the first parameter of the resource used to transmit the first reference signal. It is configured to determine shift indication.

Optionally, in another embodiment, processor 610 determines the k th cyclic shift indication as the first cyclic shift indication among the n cyclic shift indications to be selected. Configured, n is the number of cyclic shift indications to be selected, and m ₂ is determined based on the value of the first identifier and the value of the first parameter according to a preset operating rule K = mod (m ₂ , n).

  Optionally, in another embodiment, the first parameter includes one or more of the following parameters corresponding to the resource: a frame number, a subframe number, a physical resource block number, or a bandwidth.

  Optionally, in another embodiment, processor 610 is further configured to determine a first cyclic shift indication, particularly according to a first identifier value, a first parameter value, and a first offset value. The first offset value is a cell identifier value of a cell in which the first user equipment is located, an identifier value of a D2D cluster to which the first user equipment belongs, or an offset value configured by the first communication device. .

  Optionally, in another embodiment, processor 610 is specifically configured to determine a first cyclic shift indication according to a first identifier value and a first offset value, wherein the first offset value is The cell identifier value of the cell in which the first user equipment is located, the identifier value of the D2D cluster to which the first user equipment belongs, or the offset value configured by the first communication device.

  Optionally, in another embodiment, the first identifier is one of the following identifiers of the first user equipment: D2D identifier, IMSI, TMSI, D2D user group identifier, service type identifier, or D2D cluster identifier Including one or more, the D2D user group identifier is used to indicate a D2D user group to which the first user equipment belongs, and the service type identifier is used to indicate a service type provided by the first user equipment. used.

  Those skilled in the art will recognize that in combination with the examples described in the embodiments disclosed herein, the units and algorithm steps may be implemented by electronic hardware or a combination of computer software and electronic hardware. can do. Whether the function is performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the functions described for each particular application, but implementations should not be considered beyond the scope of the present invention.

  For purposes of convenience and conciseness, it will be clear to those skilled in the art that for the processing of detailed operations of the systems, devices, and units described above, reference may be made to the corresponding processing in the method embodiments described above. Although not understood in detail herein.

  It should be understood that in some embodiments provided in the present application, the disclosed systems, devices, and methods may be implemented in other manners. For example, the described apparatus embodiment is merely an example. For example, the unit division is only logical function division and may be other division in actual implementation. For example, multiple units or components may be combined with or integrated into another system, or some functions may be ignored or not performed. In addition, the displayed or discussed mutual coupling or direct coupling, or communication connection may be implemented by using some interfaces. Indirect coupling or communication connections between devices or units may be implemented electronically, mechanically or otherwise.

  A unit described as a separate part may or may not be physically separate, and a part displayed as a unit may be a physical unit or a physical unit. It may not be, may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to the actual need to achieve the objectives of the solutions of the embodiments.

  In addition, the functional units in the embodiments of the present invention may be integrated into one processing unit, each of which may physically exist alone, or two or more units may be one unit. May be integrated.

  When functions are implemented in the form of software functional units and sold or used as stand-alone products, the functions may be stored on a computer-readable storage medium. Based on such an understanding, the essential technical solution of the present invention, or a part contributing to the prior art, or a part of the technical solution, may be implemented in the form of a software product. A computer software product is stored on a storage medium and may be a computing device (even a personal computer, server, network device, etc.) to perform all or part of the method steps described in the embodiments of the present invention. Includes several instructions for instructing (good). The above-mentioned storage medium stores a program code such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, a random access memory), a magnetic disk, or an optical disk. Including any medium capable of

  The above description is only a specific implementation method of the present invention, but is not intended to limit the protection scope of the present invention. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention depends on the protection scope of the claims.

Claims (16)

A reference signal transmission method,
Determining by a first user equipment a first identifier associated with the first user equipment;
Determining the kth cyclic shift indication among the n cyclic shift indications to be selected by the first user equipment as a first cyclic shift indication, wherein n is: Is the number of cyclic shift indications to be selected, and m ₂ is a value determined based on the value of the first identifier and the value of the first parameter according to a preset operation rule K = mod (m ₂ , n),
Determining a first reference signal by the first user equipment according to the first cyclic shift indication and a preset basic sequence;
Transmitting the first reference signal to a second user equipment by the first user equipment.   The method of claim 1, wherein the first parameter includes one or more of the following parameters corresponding to resources: a frame number, a subframe number, a physical resource block number, or a bandwidth. A reference signal transmission method,
Determining by a first user equipment a first identifier associated with the first user equipment;
Determining, by the first user equipment, a first cyclic shift indication according to a value of the first identifier, a value of a first parameter, and a first offset value, the first user equipment The offset value is a cell identifier value of a cell in which the first user equipment is located, an identifier value of an end-to-end D2D cluster to which the first user equipment belongs, or an offset value configured by the first communication device. , Steps and
Determining a first reference signal by the first user equipment according to the first cyclic shift indication and a preset basic sequence;
Transmitting the first reference signal to a second user equipment by the first user equipment.   The method of claim 3, wherein the first parameter includes one or more of the following parameters corresponding to resources: a frame number, a subframe number, a physical resource block number, or a bandwidth. A reference signal transmission method,
Determining by a second user equipment a first identifier associated with the first user equipment;
Determining the kth cyclic shift indication among the n cyclic shift indications to be selected by the second user equipment as the first cyclic shift indication, wherein n is: Is the number of cyclic shift indications to be selected, and m ₂ is a value determined based on the value of the first identifier and the value of the first parameter according to a preset operation rule K = mod (m ₂ , n),
Determining a second reference signal by the second user equipment according to the first cyclic shift indication and a preset basic sequence;
Performing channel sounding on the channel according to the received first reference signal transmitted by the second user equipment through the second reference signal and the channel.   6. The method of claim 5, wherein the first parameter includes one or more of the following parameters corresponding to resources: a frame number, a subframe number, a physical resource block number, or a bandwidth. A reference signal transmission method,
Determining by a second user equipment a first identifier associated with the first user equipment;
Determining, by the second user equipment, a first cyclic shift indication according to a value of the first identifier, a value of a first parameter, and a first offset value; The offset value is a cell identifier value of a cell in which the first user equipment is located, an identifier value of an end-to-end D2D cluster to which the first user equipment belongs, or an offset value configured by the first communication device. , Steps and
Determining a second reference signal by the second user equipment according to the first cyclic shift indication and a preset basic sequence;
Performing channel sounding on the channel according to the received first reference signal transmitted by the second user equipment through the second reference signal and the channel.   The method of claim 7, wherein the first parameter includes one or more of the following parameters corresponding to resources: a frame number, a subframe number, a physical resource block number, or a bandwidth. User equipment,
A first determination unit configured to determine a first identifier associated with the user equipment;
a second determination unit configured to determine the kth cyclic shift indication among the n cyclic shift indications to be selected as the first cyclic shift indication, wherein n is Is the number of cyclic shift indications to be selected, and m ₂ is a value determined based on the value of the first identifier and the value of the first parameter according to a preset operation rule K = mod (m ₂ , n), a second determination unit;
A third determination unit configured to determine a first reference signal according to the first cyclic shift indication determined by the second determination unit and a preset basic sequence;
A user equipment comprising: a transmission unit configured to transmit the first reference signal determined by the third determination unit to a second user equipment.   The user equipment according to claim 9, wherein the first parameter includes one or more of the following parameters corresponding to resources, a frame number, a subframe number, a physical resource block number, or a bandwidth. User equipment,
A first determination unit configured to determine a first identifier associated with the user equipment;
A second determination unit configured to determine a first cyclic shift indication according to a value of the first identifier, a value of a first parameter, and a first offset value, the first determination unit comprising: Is the cell identifier value of the cell in which the user equipment is located, the identifier value of the end-to-end D2D cluster to which the user equipment belongs, or the offset value configured by the first communication device. Unit,
A third determination unit configured to determine a first reference signal according to the first cyclic shift indication determined by the second determination unit and a preset basic sequence;
A user equipment comprising: a transmission unit configured to transmit the first reference signal determined by the third determination unit to a second user equipment.   The user equipment according to claim 11, wherein the first parameter includes one or more of the following parameters corresponding to resources, a frame number, a subframe number, a physical resource block number, or a bandwidth. User equipment,
A first determination unit configured to determine a first identifier associated with the first user equipment;
a second decision unit configured to determine the kth cyclic shift indication among the n cyclic shift indications to be selected as the first cyclic shift indication, wherein n is The number of cyclic shift indications to be selected, and m ₂ is a value determined based on the value of the first identifier and the value of the first parameter according to a preset operating rule. A second determination unit , wherein k = mod (m ₂ , n);
A third determination unit configured to determine a second reference signal according to the first cyclic shift indication determined by the second determination unit and a preset basic sequence;
A receiving unit configured to receive a first reference signal transmitted over a channel, wherein the first reference signal is transmitted by the first user equipment;
A channel sounding unit configured to perform channel sounding on a channel according to the second reference signal determined by the third determination unit and the first reference signal received by the receiving unit; Comprising user equipment.   The user equipment according to claim 13, wherein the first parameter includes one or more of the following parameters corresponding to resources, a frame number, a subframe number, a physical resource block number, or a bandwidth. User equipment,
A first determination unit configured to determine a first identifier associated with the first user equipment;
A second determination unit further configured to determine a first cyclic shift indication according to a value of the first identifier, a value of a first parameter, and a first offset value, An offset value of 1 is a cell identifier value of a cell in which the first user equipment is located, an identifier value of a D2D cluster to which the first user equipment belongs, or an offset value configured by a first communication device. A second determination unit;
A third determination unit configured to determine a second reference signal according to the first cyclic shift indication determined by the second determination unit and a preset basic sequence;
A receiving unit configured to receive a first reference signal transmitted over a channel, wherein the first reference signal is transmitted by the first user equipment;
A channel sounding unit configured to perform channel sounding on a channel according to the second reference signal determined by the third determination unit and the first reference signal received by the receiving unit; Comprising user equipment.   The user equipment according to claim 15, wherein the first parameter includes one or more of the following parameters corresponding to resources, a frame number, a subframe number, a physical resource block number, or a bandwidth.

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