CN107592670B - Synchronization signal detection method and synchronization equipment - Google Patents
Synchronization signal detection method and synchronization equipment Download PDFInfo
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- CN107592670B CN107592670B CN201710720920.4A CN201710720920A CN107592670B CN 107592670 B CN107592670 B CN 107592670B CN 201710720920 A CN201710720920 A CN 201710720920A CN 107592670 B CN107592670 B CN 107592670B
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Abstract
The invention discloses a synchronous signal detection method, which comprises the following steps: selecting a receiving time period for the detection period, wherein the detection period comprises at least two synchronous signal sending periods, the receiving time period is within the detection period, and the offset of the receiving time period relative to the synchronous signal sending period covers a complete synchronous signal sending period; synchronization signals from other synchronization devices are detected during the reception period. The invention also discloses a synchronous device. Through the mode, the method and the device can improve the reliability of the synchronization process.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a synchronization signal detection method and a synchronization device.
Background
With the continuous ultra-linear increase of the number of terminals and the increasing diversification of service demands, Direct communication between devices, such as Device to Device (D2D) in mobile communication, Direct Mode Operation (DMO) in trunking communication, and wireless Mesh (Mesh) network, is a hot spot of current research because it has potential prospects of improving system performance, user experience, and application expansion.
In a direct communication system between devices, devices supporting direct communication may be referred to as synchronization devices, and synchronization is required to be performed between the synchronization devices first. During synchronization, a synchronization device needs to transmit a synchronization signal to be discovered by other synchronization devices, and also needs to detect a synchronization signal from other synchronization devices to discover other synchronization devices.
In the prior art, the synchronization device transmits the synchronization signal at a predetermined period, for example, in the D2D system, the period is 40 Transmission Time Intervals (TTIs), i.e., 40 subframes. In one synchronization signal transmission period, the synchronization apparatus selects two TTIs for synchronization, one of which is used for transmitting a synchronization signal and the other of which is used for detecting the synchronization signal. Because only one TTI is used for detecting the synchronization signal, that is, only other synchronization devices transmitting the synchronization signal in the TTI can be detected, the probability of successfully detecting the synchronization signal is low, and the probability that two synchronization devices are close but cannot successfully synchronize is high, which results in poor reliability of the synchronization process.
Disclosure of Invention
The invention mainly solves the technical problem of providing a synchronous signal detection method and a synchronous device, which can solve the problem of poor reliability of the synchronous process in the prior art.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a synchronization signal detection method including: selecting a receiving time period for the detection period, wherein the detection period comprises at least two synchronous signal sending periods, the receiving time period is within the detection period, and the offset of the receiving time period relative to the synchronous signal sending period covers a complete synchronous signal sending period; synchronization signals from other synchronization devices are detected during the reception period.
The receiving period comprises at least one continuous sub-receiving period, each sub-receiving period is in one synchronous signal sending period, and the offset of the receiving period relative to the synchronous signal sending period where the receiving period is located refers to the set of the offsets of all sub-receiving periods relative to the starting point of the synchronous signal sending period where the receiving period is located.
Wherein adjacent sub-reception periods are continuous or discrete.
Wherein selecting a receive period for the detection cycle comprises: the reception periods are randomly selected for different detection periods.
Wherein, further include: the transmission of the synchronization signal is stopped during the reception period.
Wherein, further include: if the receiving time interval overlaps with the service transmission time interval, the receiving time interval is adjusted to avoid the service transmission time interval.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a synchronization apparatus including: the selection module is used for selecting a receiving time interval for the detection period, wherein the detection period comprises at least two synchronous signal sending periods, the receiving time interval is within the detection period, and the offset of the receiving time interval relative to the synchronous signal sending period covers a complete synchronous signal sending period; and the detection module is used for detecting the synchronous signals from other synchronous devices in the receiving period.
The receiving period comprises at least one continuous sub-receiving period, each sub-receiving period is in one synchronous signal sending period, and the offset of the receiving period relative to the synchronous signal sending period where the receiving period is located refers to the set of the offsets of all sub-receiving periods relative to the starting point of the synchronous signal sending period where the receiving period is located.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a synchronization apparatus including: the processor is connected with the communication circuit; the processor is used for selecting a receiving period for the detection period, wherein the detection period comprises at least two synchronous signal sending periods, the receiving period is within the detection period, and the offset of the receiving period relative to the synchronous signal sending period covers a complete synchronous signal sending period; synchronization signals from other synchronization devices are detected by the communication circuit during the reception period.
The receiving period comprises at least one continuous sub-receiving period, each sub-receiving period is in one synchronous signal sending period, and the offset of the receiving period relative to the synchronous signal sending period where the receiving period is located refers to the set of the offsets of all sub-receiving periods relative to the starting point of the synchronous signal sending period where the receiving period is located.
Wherein adjacent sub-reception periods are continuous or discrete.
Wherein the processor is configured to randomly select the receive period for different detection periods.
Wherein the processor is further configured to stop transmitting the synchronization signal during the receive period.
Wherein the processor is further configured to adjust the receive period to avoid the traffic transmission time interval if the receive period overlaps the traffic transmission time interval.
The invention has the beneficial effects that: by selecting the receiving time interval, and covering a complete synchronous signal sending cycle by the offset of the receiving time interval relative to the synchronous signal sending cycle in which the receiving time interval is located, because the synchronous signals are sent periodically according to the synchronous signal sending cycle, other synchronous devices can be detected in the receiving time interval no matter which synchronous signal sending cycle is selected to send the synchronous signals, and the reliability of the synchronization process is improved.
Drawings
Fig. 1 is a flow chart of a first embodiment of the synchronization signal detection method of the present invention;
FIG. 2 is a schematic diagram of a receiving period in a first embodiment of the synchronization signal detection method according to the present invention;
FIG. 3 is a flow chart of a synchronization signal detection method according to a second embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first embodiment of the synchronization apparatus of the present invention;
fig. 5 is a schematic structural diagram of a second embodiment of the synchronization apparatus of the present invention.
Detailed Description
As shown in fig. 1, the first embodiment of the synchronization signal detection method of the present invention includes:
s1: a receive period is selected for the detection cycle.
The detection period includes at least two complete synchronization signal transmission periods, and generally, the detection period is composed of N complete synchronization signal transmission periods, where N is a positive integer greater than 1. The receive period is within the detection period and the offset of the receive period relative to the sync signal transmission period in which it is located covers one complete sync signal transmission period. The total length of the reception periods is greater than or equal to one synchronization signal transmission cycle.
Specifically, the receiving period includes at least one continuous sub-receiving period, each sub-receiving period being within one synchronization signal transmission cycle, and there may be one or more sub-receiving periods within one synchronization signal transmission cycle. The offset of the reception period with respect to the synchronization signal transmission cycle in which it is located refers to a set of offsets of all the sub-reception periods with respect to the start of the synchronization signal transmission cycle in which it is located. The adjacent sub-reception periods may be continuous or discrete.
For example, as shown in fig. 2, the synchronization signal transmission period is 40 TTIs, the detection period includes 4 complete synchronization signal transmission periods, and the starting position of the detection period is 0 th TTI.
The receiving period selected by the synchronization device a in the figure is 10 th-49 th TTI, which can be divided into a 1: [10,39] and A2: [40,49] two adjacent sub-reception periods. A1 shows an offset of [10,39] with respect to the start of the first synchronization signal transmission period, i.e., the 0 th TTI, in the first synchronization signal transmission period; a2 is offset by [0,9] with respect to the start of the second synchronization signal transmission period, i.e., the 40 th TTI, in the second synchronization signal transmission period. The offset of the receive period is a set of offsets of two sub-receive periods, i.e., [0,39], covering exactly one complete synchronization signal transmission cycle.
The receiving period selected by the synchronization device B in the figure is 0-9, 50-59, 100-: [0,9], A2: [50,59], A3: [100,109] and A4: [150,159] four discrete sub-reception periods. A1 shows an offset of [0,9] with respect to the start of the first synchronization signal transmission period, i.e., the 0 th TTI, in the first synchronization signal transmission period; a2 is offset by [10,19] with respect to the start of the second synchronization signal transmission period, i.e., the 40 th TTI, in the second synchronization signal transmission period; a3 is offset by [20,29] with respect to the beginning of the third synchronization signal transmission period, i.e., the 80 th TTI, in the third synchronization signal transmission period; a4 is offset by [30,39] with respect to the start of the fourth synchronization signal transmission period, i.e., 120 th TTI, within the fourth synchronization signal transmission period. The offset of the receive period is a set of offsets of four sub-receive periods, i.e., [0,39], covering exactly one complete synchronization signal transmission cycle.
This step may be performed before the corresponding detection cycle starts, e.g. after the reception period in the previous detection cycle ends, or after the corresponding detection cycle starts. If this step is performed after the start of the corresponding detection period, the start position of the selected reception period should be after the execution time of this step.
The synchronization device itself also transmits the synchronization signal periodically according to the synchronization signal transmission period, typically by selecting one TTI for transmitting the synchronization signal in each synchronization signal transmission period according to a specified offset. The start position of the reception period may be before or after the first TTI for transmitting the synchronization signal, and may of course be the same. Since the offset of the reception period needs to cover the entire transmission cycle of the synchronization signal, it must overlap with at least one TTI for transmitting the synchronization signal. For overlapping TTIs, the synchronization device may choose to stop or not stop sending synchronization signals if it can support full duplex, and should stop sending synchronization signals if it cannot support full duplex.
If there is a conflict between the receiving periods selected by two adjacent synchronization devices, that is, when one synchronization device enters the receiving period and stops sending the synchronization signal, the other synchronization device also enters the receiving period, which may result in that the synchronization signal is not detected and the synchronization fails. To reduce the likelihood of this occurrence and further improve the reliability of the synchronization process, the synchronization devices may randomly select reception periods for different detection periods, so that even if a collision occurs between the current detection period and the reception period of a neighboring synchronization device, the next detection period may no longer collide and synchronization is successfully completed.
S2: synchronization signals from other synchronization devices are detected during the reception period.
Each TTI is used to detect synchronization signals from other synchronized devices within a reception period.
Through the implementation of the embodiment, the synchronization signal is periodically transmitted according to the synchronization signal transmission cycle, the receiving period is selected, and the offset of the receiving period relative to the synchronization signal transmission cycle in which the receiving period is located covers a complete synchronization signal transmission cycle, so that no matter which synchronization signal transmission cycle is selected by other synchronization equipment to transmit the synchronization signal, the other synchronization equipment can be detected in the receiving period, and the reliability of the synchronization process is improved.
As shown in fig. 3, a second embodiment of the synchronization signal detection method according to the present invention is based on the first embodiment of the synchronization signal detection method according to the present invention, and further includes:
s3: if the receiving time interval overlaps with the service transmission time interval, the receiving time interval is adjusted to avoid the service transmission time interval.
This step should be performed after step S1, before or during step S2. To avoid service interruption, the receive period may be adjusted to avoid the service transmission time interval. The adjustment may be to advance or retard all or part of the sub-reception periods in the reception period, or to reselect all or part of the sub-reception periods in the reception period.
As shown in fig. 4, the first embodiment of the synchronization apparatus of the present invention includes:
the selection module 11 is configured to select a receiving period for a detection cycle, where the detection cycle includes at least two synchronization signal sending cycles, the receiving period is within the detection cycle, and an offset of the receiving period with respect to the synchronization signal sending cycle where the receiving period is located covers a complete synchronization signal sending cycle.
Optionally, the receiving period includes at least one continuous sub-receiving period, each sub-receiving period is within one synchronization signal sending period, and the offset of the receiving period with respect to the synchronization signal sending period where the receiving period is located refers to a set of offsets of all sub-receiving periods with respect to the start of the synchronization signal sending period where the receiving period is located.
A detecting module 12, configured to detect a synchronization signal from another synchronization device in the receiving period.
As shown in fig. 5, the second embodiment of the synchronization apparatus of the present invention includes: processor 110 and communication circuit 120, processor 110 is connected to communication circuit 120 through a bus.
The communication circuit 120 is used to transmit and receive data, and is an interface for the synchronization device to communicate with other devices.
The processor 110 controls the operation of the synchronization device, and the processor 110 may also be referred to as a Central Processing Unit (CPU). The processor 110 may be an integrated circuit chip having signal processing capabilities. The processor 110 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The synchronization device may further include a memory (not shown) for storing instructions and data necessary for the operation of the processor 110 and for storing data received by the communication circuit 120.
The processor 110 is configured to select a receiving period for a detection cycle, where the detection cycle includes at least two synchronization signal sending cycles, the receiving period is within the detection cycle, and an offset of the receiving period with respect to the synchronization signal sending cycle where the receiving period is located covers a complete synchronization signal sending cycle; the synchronization signals from the other synchronization devices are detected by the communication circuit 120 during the reception period.
Optionally, the receiving period includes at least one continuous sub-receiving period, each sub-receiving period is within one synchronization signal sending period, and the offset of the receiving period with respect to the synchronization signal sending period where the receiving period is located refers to a set of offsets of all sub-receiving periods with respect to the start of the synchronization signal sending period where the receiving period is located.
Optionally, adjacent sub-reception periods are continuous or discrete.
Optionally, the processor is configured to randomly select the reception period for different detection periods.
Optionally, the processor is further configured to stop sending the synchronization signal during the reception period.
Optionally, the processor is further configured to adjust the receiving period to avoid the traffic transmission time interval if the receiving period overlaps the traffic transmission time interval.
The functions of each part in each embodiment of the synchronization apparatus of the present invention may specifically refer to the description in the corresponding embodiment of the synchronization signal detection method of the present invention, and are not repeated here.
In the several embodiments provided in the present invention, it should be understood that the disclosed synchronization apparatus and method may be implemented in other ways. For example, the above-described embodiments of the synchronization apparatus are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A synchronization signal detection method, comprising:
selecting a receiving period for a detection cycle, wherein the detection cycle comprises at least two synchronous signal sending cycles, the receiving period is within the detection cycle, an offset of the receiving period relative to the synchronous signal sending cycle in which the receiving period is located covers a complete synchronous signal sending cycle, the total length of the receiving period is greater than one synchronous signal sending cycle, the receiving period comprises a plurality of receiving sub-periods, each synchronous signal sending cycle comprises at least one receiving sub-period, and adjacent receiving sub-periods are discrete;
detecting synchronization signals from other synchronization devices within the reception period;
wherein the selecting a reception period for the detection cycle comprises:
and randomly selecting the receiving time interval for different detection periods, and if the receiving time interval is overlapped with the service transmission time interval, adjusting the receiving time interval to avoid the service transmission time interval.
2. The method of claim 1,
the receiving period comprises at least one continuous sub-receiving period, each sub-receiving period is in one synchronous signal sending period, and the offset of the receiving period relative to the synchronous signal sending period where the receiving period is located refers to the set of offsets of all sub-receiving periods relative to the starting point of the synchronous signal sending period where the receiving period is located.
3. The method of claim 1 or 2, further comprising:
stopping transmitting the synchronization signal within the reception period.
4. A synchronization apparatus, comprising: the processor is connected with the communication circuit;
the processor is configured to select a receiving period for a detection cycle, where the detection cycle includes at least two synchronization signal transmission cycles, the receiving period is within the detection cycle, an offset of the receiving period with respect to the synchronization signal transmission cycle in which the receiving period is located covers a complete synchronization signal transmission cycle, a total length of the receiving period is greater than one synchronization signal transmission cycle, the receiving period includes a plurality of receiving sub-periods, each synchronization signal transmission cycle includes at least one receiving sub-period, and adjacent receiving sub-periods are discrete; detecting, by the communication circuit, a synchronization signal from another synchronization device within the reception period;
wherein the processor is configured to randomly select the receive period for different detection periods, and the processor is further configured to adjust the receive period to avoid a traffic transmission time interval if the receive period overlaps the traffic transmission time interval.
5. The synchronization device of claim 4,
the receiving period comprises at least one continuous sub-receiving period, each sub-receiving period is in one synchronous signal sending period, and the offset of the receiving period relative to the synchronous signal sending period where the receiving period is located refers to the set of offsets of all sub-receiving periods relative to the starting point of the synchronous signal sending period where the receiving period is located.
6. Synchronization device according to claim 4 or 5,
the processor is further configured to stop transmitting the synchronization signal during the receive period.
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| JP5236702B2 (en) * | 2010-08-20 | 2013-07-17 | シャープ株式会社 | Stereoscopic glasses |
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| CN104488336A (en) * | 2012-06-19 | 2015-04-01 | 三星电子株式会社 | Terminal synchronization method and apparatus for use in wireless communication network |
| CN104812058A (en) * | 2014-01-24 | 2015-07-29 | 北京三星通信技术研究有限公司 | Method for implementing synchronization between D2D terminals and D2D terminal device |
| CN105101387A (en) * | 2014-05-06 | 2015-11-25 | 电信科学技术研究院 | Synchronous processing method and user equipment |
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