CN110461036B - Method and terminal for transmitting and receiving synchronous signals - Google Patents
Method and terminal for transmitting and receiving synchronous signals Download PDFInfo
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- CN110461036B CN110461036B CN201910700833.1A CN201910700833A CN110461036B CN 110461036 B CN110461036 B CN 110461036B CN 201910700833 A CN201910700833 A CN 201910700833A CN 110461036 B CN110461036 B CN 110461036B
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Abstract
A method and a terminal for transmitting and receiving synchronous signals. The transmitting method comprises the following steps: the first terminal determines downlink timing; and the first terminal transmits a synchronous signal according to the determined downlink timing. By adopting the technical scheme of the method and the terminal for transmitting and receiving the synchronous signals, the transmitting terminal for user direct-connection communication uniformly adopts the downlink timing transmission synchronous signals, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the user direct-connection communication information sent by the transmitting terminal can be correctly received.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a terminal for transmitting and receiving a synchronization signal.
Background
In the conventional long term evolution (generally called Long Term Evolution, abbreviated LTE) communication technology, signaling and data interaction between User terminals or User equipments (generally called User Equipment, abbreviated UE) all need to pass through respective affiliated evolved Node bs (generally called enbs or base stations).
User direct communication (namely, device-to-Device, which is called as D2D for short) is taken as a direct communication technology, data interaction between terminals does not need to be forwarded through a base station, and interaction can be directly carried out between UE or under the assistance of a network.
However, the transmitting terminal of the user direct communication may transmit the synchronization signal at different timings, so that the receiving terminal cannot accurately obtain the timing through the synchronization signal, which affects the normal communication.
Disclosure of Invention
The embodiment of the invention provides a method and a terminal for transmitting and receiving a synchronous signal, so that a receiving terminal for direct-connected communication of a user can accurately obtain timing through the synchronous signal.
In a first aspect, an embodiment of the present invention provides a method for transmitting a synchronization signal, the method including:
a first terminal in a network coverage area determines downlink timing;
and the first terminal transmits a synchronous signal according to the determined downlink timing.
In a first possible implementation manner, the method further includes:
the first terminal receives system configuration information, wherein the system configuration information comprises resource information of the synchronous signals configured by a system and an indication for sending the synchronous signals.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, when the system configuration information includes an indication of sending a synchronization signal, the first terminal transmitting the synchronization signal according to the determined downlink timing includes:
and the first terminal transmits the synchronous signal on the resources of the synchronous signal configured by the system according to the determined downlink timing.
With reference to the first aspect or the first possible implementation manner of the first aspect or the second possible implementation manner of the first aspect, in a third possible implementation manner, the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
In a second aspect, an embodiment of the present invention provides a method for receiving a synchronization signal, the method including:
the second terminal receives the synchronous signal;
and the second terminal determines the downlink timing of the transmitting terminal according to the received synchronous signal.
In a first possible implementation manner, the second terminal receives a synchronization signal, including:
when the second terminal is in the network coverage, receiving the synchronization signal of the neighbor cell and/or the synchronization signal transmitted by the terminal outside the network coverage; or alternatively
And when the second terminal is out of the network coverage, receiving the synchronous signal transmitted by the terminal in the network coverage and/or the synchronous signal transmitted by the terminal out of the network coverage.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, when the second terminal is in a network coverage area, receiving the synchronization signal of a neighboring cell includes:
and when the second terminal is in the network coverage range, receiving the synchronous signal according to the cell identification or the physical synchronous source identification of the adjacent cell.
With reference to the second aspect or the first possible implementation manner of the second aspect or the second possible implementation manner of the second aspect, in a third possible implementation manner, the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
In a third aspect, an embodiment of the present invention provides a terminal, including:
a determining unit, configured to determine downlink timing when the terminal is within a network coverage area;
and the transmitting unit is used for transmitting the synchronous signal according to the determined downlink timing.
In a first possible implementation manner, the terminal further includes:
and the receiving unit is used for receiving system configuration information, wherein the system configuration information comprises resource information of the synchronous signals configured by the system and an indication for transmitting the synchronous signals.
With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, the transmitting unit is specifically configured to: and when the system configuration information comprises an indication of sending a synchronous signal, transmitting the synchronous signal on resources of the synchronous signal configured by a system according to the determined downlink timing.
With reference to the third aspect or the first possible implementation manner of the third aspect or the second possible implementation manner of the third aspect, in a third possible implementation manner, the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
In a fourth aspect, an embodiment of the present invention provides a terminal, including:
a receiving unit for receiving a synchronization signal;
and the determining unit is used for determining the downlink timing of the transmitting terminal according to the received synchronous signal.
In a first possible implementation manner, the receiving unit is specifically configured to:
when the terminal is in the network coverage, receiving the synchronization signal of the neighbor cell and/or the synchronization signal transmitted by the terminal outside the network coverage; or alternatively
And when the terminal is out of the network coverage, receiving the synchronous signal transmitted by the terminal in the network coverage and/or the synchronous signal transmitted by the terminal out of the network coverage.
With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the receiving unit is specifically configured to:
and when the second terminal is in the network coverage range, receiving the synchronous signal according to the cell identification or the physical synchronous source identification of the adjacent cell.
With reference to the fourth aspect or the first possible implementation manner of the fourth aspect or the second possible implementation manner of the fourth aspect, in a third possible implementation manner, the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
In a fifth aspect, there is provided a terminal comprising: a processor and a transmitter;
the processor is used for determining downlink timing when the terminal is in the network coverage range;
the transmitter is used for transmitting a synchronous signal according to the determined downlink timing.
In a first possible implementation, the terminal further includes a receiver;
the receiver is configured to receive system configuration information, where the system configuration information includes resource information of the synchronization signal configured by a system and an indication to send the synchronization signal.
With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner, the transmitter is specifically configured to transmit, when the system configuration information includes an indication of transmitting a synchronization signal, the synchronization signal on a resource of the synchronization signal configured by a system according to the determined downlink timing.
With reference to the fifth aspect or the first possible implementation manner of the fifth aspect or the second possible implementation manner of the fifth aspect, in a third possible implementation manner, the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
In a sixth aspect, there is provided a terminal comprising: a receiver and a processor;
the receiver is used for receiving the synchronous signal;
and the processor is used for determining the downlink timing of the transmitting terminal according to the received synchronous signal.
In a first possible implementation, the receiver is specifically configured to:
when the second terminal is in the network coverage, receiving the synchronization signal of the neighbor cell and/or the synchronization signal transmitted by the terminal outside the network coverage; or alternatively
And when the second terminal is out of the network coverage, receiving the synchronous signal transmitted by the terminal in the network coverage and/or the synchronous signal transmitted by the terminal out of the network coverage.
With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner, the step of receiving, by the receiver, the synchronization signal of the neighboring cell when the second terminal is within a network coverage area includes:
and when the second terminal is in the network coverage range, receiving the synchronous signal according to the cell identification or the physical synchronous source identification of the confirmed cell.
With reference to the sixth aspect or the first possible implementation manner of the sixth aspect or the second possible implementation manner of the sixth aspect, in a third possible implementation manner, the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
According to the method and the terminal for transmitting and receiving the synchronous signals, the transmitting terminal for direct-connected communication of the user uniformly adopts the downlink timing transmission synchronous signals, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the direct-connected communication information of the user sent by the transmitting terminal can be accurately received.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a network communication structure provided in the prior art;
fig. 2 is a flowchart of a method for transmitting a synchronization signal according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for receiving a synchronization signal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another terminal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another terminal according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
LTE-D2D is a terminal direct communication technology based on LTE newly defined by the third generation partnership project (3 rd Generation partnership project, abbreviated as 3 GPP), and LTE-D2D communication technology is an application of adding D2D to an existing LTE system, that is, user direct communication and LTE communication coexist, as shown in fig. 1, terminal 1 may transmit user direct communication data to terminal 2 and terminal 3 for user direct communication, and terminal 1 may also communicate with a base station. The process of transmitting communication data by the terminal 1 and receiving communication data by the base station is called uplink communication; the process of transmitting communication data by the base station and receiving communication data by the terminal 1 is called downlink communication; the terminal 1 serves as a data transmitting party, and the communication between the terminal and the terminals 2 and 3 is direct communication of users.
The user direct communication has three working scenes, namely network coverage, no network coverage and partial network coverage, and in the working scene of the network coverage, terminals participating in the user direct communication are all in the coverage of the network; in a scene without network coverage, terminals participating in direct communication of users are out of the coverage of the network; in the scene of partial network coverage, one part of terminals participating in direct communication of users are in the coverage of the network, and the other part of terminals are out of the coverage of the network.
Usually, the two communication parties need to establish synchronization first, and the frequencies and the timings of the two devices are adjusted to the same frequency and time. Synchronization requires that a common synchronization reference be defined between two terminals communicating, a synchronization source being the device providing the synchronization reference. In the working scenario of network coverage, the prior art synchronizes the base stations in the network as synchronization sources to the terminals of the base stations to form a group. In a working scenario without network coverage, one or all terminals of a plurality of terminals without network coverage in the prior art are used as synchronization sources, and other terminals synchronized to a certain synchronization source form a group. In the working scene of partial network coverage, one part of terminals are in the network coverage, and the other part of terminals are outside the network coverage, and the terminals in the network coverage transmit synchronous signals to be used as synchronous references of the terminals outside the network coverage.
User-direct communication is divided into two main modes/types of application: D2D discovery (discovery) and D2D communication (communication).
D2D discovery means that a terminal transmits a discovery message (discovery message), and other terminals obtain information of the transmitting terminal by reading this discovery message, for example: including identity information (identity identification) of the terminal, etc.
D2D communication means that a terminal transmits scheduling assignment (Scheduling Assignment, SA) information and data, and other terminals obtain information such as a transmission format of subsequent data by reading the SA information, thereby correctly receiving the subsequent data information. The SA information, together with the scheduled data transmission format, the adopted resources, and the like, may be scheduled by the base station (i.e., D2D communication mode one, mode 1), or the transmitting terminal may select the resources by itself in the resource pool configured by the base station (i.e., D2D communication mode two, mode 2). The resource pool is a communication term, that is, a group of communication resources is a set of a plurality of communication resources.
D2D communication can now be used in the three scenarios described above, whereas D2D discovery only involves network coverage working scenarios. But the present solution does not limit the working scenario corresponding to the D2D type.
Terminals within the network coverage transmit synchronization signals, such as D2DSS (Device to Device Synchronization Signal, user direct communication synchronization signals) and/or PD2DSCH (Physical Device to Device Synchronization Channel, physical user direct communication synchronization channels), so that terminals outside the network coverage in the operating scenario of part of the network coverage can capture the synchronization signals, thereby establishing synchronization with terminals within the network coverage and performing user direct communication (D2D discovery and/or D2D communication); the method can also enable terminals of different cells (inter-cells) to detect and receive the synchronous signals in the working scene of network coverage and asynchronous among cells, so that user direct communication information (D2D discovery message and/or D2D communication information) sent by terminals of adjacent cells can be correctly received.
The technical scheme provided by the embodiment of the invention can be applied to the working scene of the partial network coverage and the situation of D2D communication or D2D discovery of the network coverage scene crossing cells, such as the situation that cells are asynchronous.
Terminals located within the network coverage transmit synchronization signals, and terminals that need to acquire synchronization acquire the synchronization signals by searching for the synchronization signals, such as terminals of asynchronous neighbor cells, or terminals outside the network coverage in the working scene of part of the network coverage.
In a scenario of partial network coverage, a part of terminals performing user direct communication (D2D communication and/or D2D discovery) is within the network coverage, and another part of terminals is outside the network coverage, and the D2D communication in the user direct communication will be described below as an example. A first terminal of D2D communication in a network coverage transmits a synchronous signal corresponding to D2D communication, synchronous reference is sourced from a service cell of the first terminal, a second terminal of D2D communication outside the network coverage detects and receives the synchronous signal corresponding to the D2D communication, the synchronous signal is indirectly synchronized to the network, then the system configuration information of the network for the D2D communication is obtained according to a PD2DSCH, information such as a D2D frame number (D2D frame number) and the like is obtained, and then the second terminal outside the network coverage communicates with the terminal in the network coverage according to the configuration of the network for the D2D communication; similarly, a first terminal located in a network coverage area transmits a synchronous signal, a second terminal located in an asynchronous neighbor cell in the network coverage area detects and receives the synchronous signal, indirectly synchronizes to a cell where the first terminal transmitting the captured synchronous signal is located, and searches for a D2D discovery message according to configuration information (issued by the cell where the second terminal is located and/or obtained by a PD2 DSCH) of D2D discovery of the cell where the first terminal is located, information such as a D2D frame number (D2D frame number), and the like.
The D2D communication and D2D discovery may be independent of each other, and are not premised on each other, for example, one cell may have only terminals performing D2D discovery or only terminals performing D2D communication.
There are two timings for D2D communication, namely, downlink timing and uplink timing, which can be employed. The downlink timing is the timing at which the terminal receives the downlink signal (e.g., primary synchronization signal Primary Synchroniazation Signal, secondary synchronization signal Secondary Synchronization Signal, cell reference signal cell-specific reference signal) of the serving base station to acquire; the uplink Timing is the Timing adjusted by the terminal according to Timing adjustment (Timing Advance) information sent by the serving base station. The last time symbol (single carrier frequency division multiple access symbol SC-FDMA, single carrier frequency division multiplex access) of the D2D subframe (subframe) transmitted with downlink timing is deactivated as an interval (gap), while the D2D subframe transmitted with uplink timing has no gap. If some terminals adopt uplink timing to send the synchronizing signals, and some terminals adopt downlink timing to send the synchronizing signals, the terminals respectively adopting the two types of timing cannot send the synchronizing signals in the same subframe, so that system resources are wasted; similarly, the receiving terminal cannot obtain whether to acquire uplink timing or downlink timing through the D2DSS, so there are 2 possibilities of whether to receive and demodulate the last symbol, blind detection is needed, and information about what timing to transmit is obtained. If the D2D subframe includes only the D2DSS signal, 4 time symbols are all included, and all of the remaining time symbols do not transmit signals, the terminal cannot know at all which timing the D2DSS is transmitted, and the timing information is necessary information for correctly receiving and demodulating the subsequent SA and data or the D2D discovery message, and the information is missing, so that the subsequent D2D signal cannot be correctly received and demodulated.
The embodiment of the invention provides a method and a terminal for transmitting and receiving a synchronous signal, wherein a transmitting terminal for direct-connected communication of a user uniformly adopts downlink timing to transmit the synchronous signal, so that a receiving terminal can accurately determine timing information of the transmitting terminal according to the received synchronous signal, thereby correctly receiving direct-connected communication information of the user transmitted by the transmitting terminal.
The following is a detailed description of specific embodiments:
fig. 2 is a method for transmitting a synchronization signal according to an embodiment of the present invention, as shown in fig. 2, the method includes:
s101, a first terminal in network coverage determines downlink timing.
The transmitting terminal for user direct communication uniformly adopts downlink timing, namely uniformly determines that the last symbol of the transmitted D2D subframe stops transmitting as an interval, and the receiving terminal does not need to receive and demodulate the last symbol.
S102, the first terminal transmits a synchronous signal according to the determined downlink timing.
All transmitting terminals transmit the synchronous signals according to the downlink timing, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the user direct communication information transmitted by the transmitting terminal can be accurately received.
Further, the method further comprises: the first terminal receives system configuration information, wherein the system configuration information comprises resource information of the synchronous signals configured by a system and an indication for sending the synchronous signals.
Specifically, the system configures the first terminal to transmit a synchronization signal in a signaling mode; wherein the signaling may be higher layer (e.g., radio Resource Control radio resource control layer, RRC for short) and/or physical layer broadcast signaling; the signaling may also be higher layer and/or physical layer specific signaling.
When the system configuration information includes an instruction for sending a synchronization signal, the first terminal sends the synchronization signal according to the determined downlink timing, including:
and the first terminal transmits the synchronous signal on the resources of the synchronous signal configured by the system according to the determined downlink timing.
Wherein the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
Therefore, according to the method for transmitting the synchronization signal provided by the embodiment of the invention, the transmitting terminal of the user direct-connection communication uniformly adopts the downlink timing transmission synchronization signal, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronization signal, thereby correctly receiving the user direct-connection communication information sent by the transmitting terminal.
Fig. 3 is a method for receiving a synchronization signal according to an embodiment of the present invention, as shown in fig. 3, the method includes:
s201, the second terminal receives the synchronous signal.
And the second terminal searches and detects surrounding synchronous signals, and detects and receives the synchronous signals. For example, when the second terminal is in the network coverage, detecting and receiving the synchronization signal of the neighboring cell and/or the synchronization signal transmitted from the terminal outside the network coverage, specifically, detecting and receiving the synchronization signal according to the cell identifier or the physical synchronization source identifier (PSSID Physical Synchronization Source Identity) of the neighboring cell; or when the second terminal is out of the network coverage, detecting and receiving the synchronous signal transmitted by the terminal in the network coverage and/or the synchronous signal transmitted by the terminal out of the network coverage.
Wherein the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
S202, the second terminal determines the downlink timing of the transmitting terminal according to the received synchronous signal.
Since the synchronization signal sent by the first terminal is fixedly sent by adopting the downlink timing, the second terminal determines the downlink timing of the transmitting terminal according to the timing obtained by the received synchronization signal, namely: the last time symbol is not received.
Because all transmitting terminals transmit the synchronous signals according to the downlink timing, the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and thus, the user direct communication information sent by the transmitting terminal can be correctly received. In the working scene of partial network coverage, more effective discovery and/or communication of terminals in and out of the network coverage can be realized, and the difficulty of contact between users in and out of the network coverage is reduced; while enabling and enabling more efficient cross-cell (inter-cell) discovery and/or communication for terminals within network coverage.
Therefore, according to the method for receiving the synchronization signal provided by the embodiment of the invention, the receiving terminal for user direct-connection communication uniformly adopts the synchronization signal transmitted in the downlink timing through the receiving and transmitting terminal, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronization signal, thereby correctly receiving the user direct-connection communication information transmitted by the transmitting terminal.
Fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention, as shown in fig. 4, the terminal 1000 includes:
a determining unit 11, configured to determine downlink timing when the terminal is within the network coverage.
The transmitting terminal for user direct communication uniformly adopts downlink timing, that is, the determining unit 11 uniformly determines that the last symbol of the transmitted D2D subframe stops transmitting as an interval, and the receiving terminal does not need to receive and demodulate the last symbol.
And a transmitting unit 12, configured to transmit a synchronization signal according to the determined downlink timing.
All transmitting terminals transmit the synchronous signals according to the downlink timing, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the user direct communication information transmitted by the transmitting terminal can be accurately received.
Further, the terminal further includes: a receiving unit (not shown in the figure) for receiving system configuration information, wherein the system configuration information includes resource information of the synchronization signal configured by the system and an indication of transmitting the transmission synchronization signal.
Specifically, the system configures the first terminal to transmit a synchronization signal in a signaling mode; wherein the signaling may be higher layer (e.g., radio Resource Control radio resource control layer, RRC for short) and/or physical layer broadcast signaling; the signaling may also be higher layer and/or physical layer specific signaling.
Wherein, when the system configuration information includes an indication to transmit a synchronization signal, the transmitting unit 12 is specifically configured to:
and transmitting the synchronous signal on the resources of the synchronous signal configured by the system according to the determined downlink timing.
Wherein the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
Therefore, according to the terminal provided by the embodiment of the invention, the downlink timing transmitting synchronous signals are uniformly adopted by the terminal, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the user direct communication information sent by the transmitting terminal can be accurately received.
Fig. 5 is a schematic structural diagram of another terminal according to an embodiment of the present invention, as shown in fig. 5, the terminal 2000 includes:
a receiving unit 21 for receiving the synchronization signal.
The receiving unit 21 performs search detection on the surrounding synchronization signal, detects the synchronization signal, and receives the synchronization signal. For example, when the second terminal is in the network coverage, detecting and receiving the synchronization signal of the neighboring cell and/or the synchronization signal transmitted from the terminal outside the network coverage, specifically, detecting and receiving the synchronization signal according to the cell identifier or the physical synchronization source identifier (PSSID Physical Synchronization Source Identity) of the neighboring cell; or when the second terminal is out of the network coverage, detecting and receiving the synchronous signal transmitted by the terminal in the network coverage and/or the synchronous signal transmitted by the terminal out of the network coverage.
Wherein the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
A determining unit 22, configured to determine a downlink timing of the transmitting terminal according to the received synchronization signal.
Since the synchronization signal sent by the first terminal is fixedly sent by adopting the downlink timing, the second terminal determines the downlink timing of the transmitting terminal according to the timing obtained by the received synchronization signal, namely: the last time symbol is not received.
Because all transmitting terminals transmit the synchronous signals according to the downlink timing, the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and thus, the user direct communication information sent by the transmitting terminal can be correctly received. In the working scene of partial network coverage, more effective discovery and/or communication of terminals in and out of the network coverage can be realized, and the difficulty of contact between users in and out of the network coverage is reduced; while enabling and enabling more efficient cross-cell (inter-cell) discovery and/or communication for terminals within network coverage.
Therefore, according to the terminal provided by the embodiment of the invention, the receiving and transmitting terminal uniformly adopts the downlink timing transmitting synchronous signals, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the user direct communication information sent by the transmitting terminal can be accurately received.
Fig. 6 is a schematic structural diagram of another terminal according to an embodiment of the present invention, as shown in fig. 6, the terminal 3000 includes: a processor 31 and a transmitter 32;
the processor 31 is configured to determine downlink timing when the terminal is within a network coverage area;
the transmitter 32 is configured to transmit a synchronization signal according to the determined downlink timing.
As an embodiment, the terminal 3000 further includes a receiver (not shown in the figure);
the receiver is configured to receive system configuration information, where the system configuration information includes resource information of the synchronization signal configured by a system and an indication to send the synchronization signal.
The transmitter 32 is specifically configured to transmit the synchronization signal on a resource of the synchronization signal configured by the system according to the determined downlink timing when the system configuration information includes an indication to transmit the synchronization signal.
Wherein the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
Therefore, according to the terminal provided by the embodiment of the invention, the downlink timing transmitting synchronous signals are uniformly adopted by the terminal, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the user direct communication information sent by the transmitting terminal can be accurately received.
Fig. 7 is a schematic structural diagram of another terminal according to an embodiment of the present invention, as shown in fig. 7, the terminal 4000 includes: a receiver 41 and a processor 42;
the receiver 41 is configured to receive a synchronization signal;
the processor 42 is configured to determine a downlink timing of the transmitting terminal according to the received synchronization signal.
As an embodiment, the receiver 41 is specifically configured to:
when the second terminal is in the network coverage, receiving the synchronization signal of the neighbor cell and/or the synchronization signal transmitted by the terminal outside the network coverage; or alternatively
And when the second terminal is out of the network coverage, receiving the synchronous signal transmitted by the terminal in the network coverage and/or the synchronous signal transmitted by the terminal out of the network coverage.
Specifically, the step of receiving the synchronization signal of the neighboring cell when the second terminal is within the network coverage area is performed by the receiver 41, including:
and when the second terminal is in the network coverage range, receiving the synchronous signal according to the cell identification or the physical synchronous source identification of the confirmed cell.
Wherein the synchronization signal includes:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
Therefore, according to the terminal provided by the embodiment of the invention, the receiving and transmitting terminal uniformly adopts the downlink timing transmitting synchronous signals, so that the receiving terminal can accurately determine the timing information of the transmitting terminal according to the received synchronous signals, and the user direct communication information sent by the transmitting terminal can be accurately received.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present invention is not limited by the order of action described, as some steps may be performed in other order or simultaneously according to the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the device of the embodiment of the invention can be combined, divided and deleted according to actual needs. Those skilled in the art can combine or combine the features of the different embodiments described in this specification and the different embodiments.
From the above description of embodiments, it will be apparent to those skilled in the art that the present invention may be implemented in hardware, or firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limited to: the computer readable medium may include random access Memory (Random Access Memory, RAM), read-Only Memory (ROM), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), compact disk Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, it is possible to provide a device for the treatment of a disease. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (Digital Subscriber Line, DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the fixing of the medium. As used herein, discs (disks) and disks include Compact Discs (CDs), laser discs, optical discs, digital Versatile Discs (DVDs), floppy disks, and blu-ray discs where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
In summary, the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. A method of transmitting a synchronization signal, comprising:
a first terminal in a network coverage area determines downlink timing;
the first terminal receives system configuration information, wherein the system configuration information comprises information of resources of synchronous signals configured by a system;
and when the system configuration information comprises an indication for sending the synchronous signal, the first terminal transmits the synchronous signal on the resource of the synchronous signal configured by the system according to the determined downlink timing.
2. The method of claim 1, wherein the first terminal uses a last time symbol of the D2D subframe of the downlink timing transmission as an interval.
3. The method according to claim 1 or 2, wherein the synchronization signal comprises:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
4. A method of communication, comprising:
transmitting system configuration information to a first terminal in a network coverage range, wherein the system configuration information comprises information of resources of a synchronization signal configured by a system;
and transmitting a downlink signal to the first terminal, wherein the downlink signal is used for determining downlink timing by the first terminal, and when the system configuration information comprises an indication for transmitting a synchronization signal, the first terminal transmits the synchronization signal on a resource of the synchronization signal configured by the system according to the determined downlink timing.
5. The method of claim 4, wherein the synchronization signal comprises:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
6. An apparatus for transmitting a synchronization signal in a first terminal, comprising:
a determining unit, configured to determine downlink timing when the first terminal is within a network coverage area;
a receiving unit configured to receive system configuration information including information of resources of a synchronization signal configured by a system;
and the transmitting unit is used for transmitting the synchronous signal on the resources of the synchronous signal configured by the system according to the determined downlink timing when the system configuration information comprises the indication of transmitting the synchronous signal.
7. The apparatus of claim 6, wherein the means for determining is further configured to determine a last time symbol of the D2D subframe of the downlink timing transmission to be stalled as an interval.
8. The apparatus of claim 6 or 7, wherein the synchronization signal comprises:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
9. A communication device, comprising:
a transmitting unit, configured to transmit system configuration information to a first terminal device, where the system configuration information includes information of resources of a synchronization signal configured by a system;
the sending unit is further configured to send a downlink signal to the first terminal device, where the downlink signal is used for the first terminal to determine downlink timing, and when the system configuration information includes an indication of sending a synchronization signal, the first terminal sends the synchronization signal on a resource of the synchronization signal configured by the system according to the determined downlink timing.
10. The apparatus of claim 9, wherein the synchronization signal comprises:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
11. A first terminal, comprising: a processor, a receiver, and a transmitter;
the processor is used for determining downlink timing when the first terminal is in network coverage;
the receiver is used for receiving system configuration information, and the system configuration information comprises information of resources of synchronous signals configured by a system;
and when the system configuration information comprises an indication for sending the synchronous signal, the transmitter is used for transmitting the synchronous signal on the resource of the synchronous signal configured by the system according to the determined downlink timing.
12. The first terminal of claim 11, wherein the transmitter is further configured to stall a last time symbol of a D2D subframe transmitted by the first terminal with the downlink timing as an interval.
13. The first terminal according to claim 11 or 12, wherein the synchronization signal comprises:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
14. A base station comprising a transmitter:
the transmitter is used for transmitting system configuration information to the first terminal, wherein the system configuration information comprises information of resources of synchronous signals configured by a system;
the transmitter is further configured to send a downlink signal to the first terminal, where the downlink signal is used for the first terminal to determine downlink timing, and when the system configuration information includes an indication of sending a synchronization signal, the first terminal transmits the synchronization signal on a resource of the synchronization signal configured by the system according to the determined downlink timing.
15. The base station of claim 14, wherein the synchronization signal comprises:
D2D synchronization signals; or alternatively
D2D synchronization signals and physical D2D synchronization channels;
wherein the D2D synchronization signal includes: a primary D2D synchronization signal and a secondary D2D synchronization signal.
16. A computer readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 3.
17. A computer readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 4 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910700833.1A CN110461036B (en) | 2014-09-25 | 2014-09-25 | Method and terminal for transmitting and receiving synchronous signals |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2014/087450 WO2016045061A1 (en) | 2014-09-25 | 2014-09-25 | Methods for emitting and receiving synchronisation signal, and terminal |
| CN201910700833.1A CN110461036B (en) | 2014-09-25 | 2014-09-25 | Method and terminal for transmitting and receiving synchronous signals |
| CN201480028862.3A CN105745977B (en) | 2014-09-25 | 2014-09-25 | A kind of method and terminal for emitting, receiving synchronization signal |
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| CN201480028862.3A Division CN105745977B (en) | 2014-09-25 | 2014-09-25 | A kind of method and terminal for emitting, receiving synchronization signal |
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| CN201910700833.1A Active CN110461036B (en) | 2014-09-25 | 2014-09-25 | Method and terminal for transmitting and receiving synchronous signals |
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| CN110461036A (en) | 2019-11-15 |
| CN105745977A (en) | 2016-07-06 |
| WO2016045061A1 (en) | 2016-03-31 |
| CN105745977B (en) | 2019-08-13 |
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