WO2018133132A1 - Synchronization method and device - Google Patents

Abstract

Embodiments of the present application provide a synchronization method and device, the method comprising: a first terminal determines a target subframe from among synchronization subframes, the synchronization subframe being used for sending a first synchronization subframe signal, the first terminal not sending the first synchronization subframe signal during the target subframe; the first terminal receives, during the target subframe, a second synchronization subframe signal sent by a second terminal. According to the embodiments of the present application, a terminal determines a target subframe from among periodic synchronization subframes and, during the target subframe, receives a synchronization subframe signal sent by another terminal rather than sending a synchronization subframe signal, so that the terminal can update its own synchronization subframe signal by means of the synchronization subframe signal sent by the other terminal, so as to ensure synchronization subframe signals, subsequent to the target subframe, sent by the terminal are the same as those sent by the other terminal and to prevent a receiving end from being unable to correctly parse signals when receiving two different synchronization subframe signals during a same synchronization subframe, thereby avoiding synchronization subframe collision.

Description

Synchronization method and device Technical field

The embodiments of the present application relate to communication technologies, and in particular, to a synchronization method and device.

Background technique

Vehicle Internet (also known as LTE-V) based on Long Term Evolution (LTE) system includes Vehicle to Vehicle (V2V) communication, Vehicle to Pedestrian (V2P) communication, vehicle and foundation Vehicle to Infrastructure (V2I) communication. V2V communication, V2P communication, and V2I communication are collectively referred to as V2X (Vehicle to Everything). The terminals in the Internet of Vehicles may be Vehicle-UE (V-UE) and Handheld Terminal (P-UE), or other terminals that support V2X functions.

The terminal in the Internet of Vehicles synchronizes with other terminals by periodically transmitting a synchronization signal, and the terminal detects the synchronization channel before transmitting the synchronization signal. If the synchronization source terminal with higher priority than the terminal is not detected, the terminal is A synchronization signal is sent every cycle.

If the contents of the synchronization signals sent by the two terminals on the same synchronization subframe are different, and the receiving end receives the two synchronization signals at the same time, the receiving end cannot correctly parse the two synchronization signals, thereby causing synchronization subframe collision.

Application content

The embodiment of the present application provides a synchronization method and device to avoid synchronization subframe collision.

In a first aspect, the present application provides a synchronization method, including: a first terminal determines a target subframe in a synchronization subframe, and a synchronization subframe is used to send a first synchronization subframe signal, but the first terminal does not on the target subframe. Transmitting the first synchronization subframe signal, but receiving the second synchronization subframe signal sent by the second terminal, so that the first terminal can update its synchronization subframe signal by using the synchronization subframe signal sent by the second terminal to ensure the target subframe. After the frame, the synchronization subframe signals sent by the first terminal and the second terminal are the same, so that the receiving end can receive two different synchronization subframe signals in the same synchronization subframe and cannot correctly parse the signal, thereby avoiding synchronization subframe collision.

In a possible design, the method further includes: the first terminal periodically or randomly discards the synchronization subframe, and the synchronization subframe discarded by the first terminal is the target subframe.

In a possible design, the method further includes: the first terminal discards k synchronization subframes every N cycles, 0≤k≤N, the period is a transmission period of the synchronization subframe signal, and the synchronization includes the synchronization sub-frame frame.

In one possible design, N and k are determined based on priority information of the first terminal.

In a possible design, the method further includes: receiving, by the first terminal, configuration information sent by the base station, where the configuration information includes at least one of N, k, and priority information of the first terminal.

In a possible design, the first terminal stores in advance at least one of N, k, and priority information of the first terminal.

In a possible design, the method further includes: the first terminal discards the synchronization subframe according to the preset probability, and the probability indicates a probability that the first terminal does not send the first synchronization subframe signal in the synchronization subframe.

In one possible design, the preset probability is determined based on the priority information of the first terminal.

In a possible design, the method further includes: receiving, by the first terminal, configuration information sent by the base station, where the configuration information includes a mapping relationship between the preset probability and the priority information of the first terminal.

In a possible design, the first terminal pre-stores a mapping relationship between the preset probability and the priority information of the first terminal.

In a possible design, the method further includes: the first terminal discards the designated symbol of the first synchronization subframe signal in the synchronization subframe; and the first terminal does not correspond to the specified symbol of the first synchronization subframe signal, Transmitting a designated symbol of the first synchronization subframe signal, and receiving a designated symbol of the second synchronization subframe signal that is sent by the second terminal in the synchronization subframe; and determining, by the first terminal, the second terminal according to the designated symbol of the second synchronization subframe signal The priority of the first terminal is higher than the priority of the first terminal, and/or the broadcast channel information of the second terminal is updated, and the first terminal determines that the synchronization subframe after the synchronization subframe and the synchronization subframe is one cycle is the target sub-frame. frame.

In one possible design, the designated symbol is the last symbol of the first synchronization subframe signal; the method further includes: the first terminal periodically or randomly discarding the designated symbol of the first synchronization subframe signal in the synchronization subframe.

In one possible design, the designated symbol includes a sequence of information for indicating priority indication information and/or broadcast channel information update indication information.

In one possible design, the designated symbol also includes a reference sequence that precedes the information sequence.

In one possible design, the designated symbol also includes the transceiving conversion time.

In one possible design, the specified symbol includes two transceiving conversion times.

In one possible design, the information sequence includes a first sequence and/or a second sequence, the first sequence is used to indicate priority indication information, and the second sequence is used to represent broadcast channel information update indication information.

In a possible design, the first sequence includes at least one subsequence, and the second sequence includes at least one subsequence; wherein each subsequence includes basic sequence and phase information, and phase information in the first sequence is used to indicate priority The indication information, the phase information in the second sequence is used to indicate broadcast channel information update indication information.

In a possible design, the method further includes: determining, by the first terminal, whether the first synchronization subframe signal and the second synchronization subframe signal corresponding to the target subframe are consistent; if the target subframe corresponds to the first synchronization subframe signal And the first synchronization subframe signal is updated according to the second synchronization subframe signal; the first terminal sends the updated first synchronization subframe signal.

In one possible design, the first synchronization subframe signal includes a first synchronization signal and first broadcast information, and the second synchronization subframe signal includes a second synchronization signal and second broadcast information.

In a possible design, the method further comprises: the first terminal updating the first broadcast information according to the second broadcast information; and/or, the first terminal updating the first synchronization signal according to the second synchronization signal.

In a possible design, the method further includes: the first terminal transmitting the updated first synchronization subframe signal by using a synchronization subframe in a next period of the period in which the target subframe is located.

In a possible design, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the first terminal and the synchronization subframe corresponding to the second terminal are the same.

In a possible design, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the first terminal and the synchronization subframe corresponding to the second terminal are different.

In a possible design, the first terminal passes the next sub-frame in the period of the target subframe. The synchronization subframe transmits the updated first synchronization subframe signal.

In a possible design, the method further includes: the first terminal updating the first broadcast information according to the second broadcast information, and updating the first synchronization signal according to the second synchronization signal.

In a possible design, the method further includes: the first terminal updating the first broadcast information according to the second broadcast information, and the second synchronization signal is different from the first synchronization signal.

In a second aspect, the application provides a communication device, including: a processor, a receiver, and a transmitter;

The processor is configured to determine a target subframe in the synchronization subframe, where the synchronization subframe is used to send the first synchronization subframe signal, and the processor sends the first synchronization subframe signal in the target subframe without using the transmitter;

The receiver is configured to receive a second synchronization subframe signal sent by another communication device in the target subframe.

In a possible design, when the processor determines the target subframe in the synchronization subframe, it is specifically used to:

The synchronization subframe is periodically or randomly discarded, and the synchronization subframe discarded by the processor is the target subframe.

In one possible design, when the processor periodically discards the synchronization subframe, it is specifically used to:

The k sync subframes are discarded every N cycles, 0≤k≤N, and the period is a transmission period of the synchronization subframe signal, and the synchronization subframe is included in the period.

In one possible design, N and k are determined based on the priority information of the communication device.

In a possible design, before the processor determines the target subframe in the synchronization subframe, the receiver is further configured to receive configuration information sent by the base station, where the configuration information includes at least one of N, k, and priority information of the communication device. .

In a possible design, the communication device further includes:

And a memory for pre-storing at least one of N, k, and priority information of the communication device.

In a possible design, when the processor randomly discards the synchronization subframe, it is specifically used to:

The synchronization subframe is discarded according to a preset probability, and the probability indicates a probability that the processor does not transmit the first synchronization subframe signal in the synchronization subframe.

In one possible design, the preset probability is determined based on the priority information of the communication device.

In a possible design, before the processor determines the target subframe in the synchronization subframe, the receiver is further configured to receive configuration information sent by the base station, where the configuration information includes mapping between the preset probability and the priority information of the communication device. relationship.

In a possible design, the communication device further includes:

The memory is configured to pre-store a mapping relationship between the preset probability and the priority information of the communication device.

In one possible design, the processor specifically determines when the target subframe is determined in the synchronization subframe:

Discarding the designated symbol of the first synchronization subframe signal in the synchronization subframe;

And transmitting, by the receiver, a designated symbol of the first synchronization subframe signal, and receiving, by the receiver, a second synchronization subframe signal that is sent by the other communication device in the synchronization subframe, in a time period corresponding to the designated symbol of the first synchronization subframe signal. Specified symbol

If the processor determines that the priority of the other communication device is higher than the priority of the communication device according to the designated symbol of the second synchronization subframe signal, and/or the broadcast channel information of the other communication device has been updated, determining the synchronization subframe, The synchronization subframe in which the synchronization subframe is one cycle is the target subframe.

In one possible design, the designated symbol is the last symbol of the first sync subframe signal;

When the processor discards the designated symbol of the first synchronization subframe signal in the synchronization subframe, it is specifically used to:

The designated symbol of the first sync subframe signal in the sync subframe is periodically or randomly discarded.

In one possible design, the designated symbol includes a sequence of information for indicating priority indication information and/or broadcast channel information update indication information.

In one possible design, the designated symbol also includes a reference sequence that precedes the information sequence.

In one possible design, the designated symbol also includes the transceiving conversion time.

In one possible design, the specified symbol includes two transceiving conversion times.

In one possible design, the information sequence includes a first sequence and/or a second sequence, the first sequence is used to indicate priority indication information, and the second sequence is used to represent broadcast channel information update indication information.

In one possible design, the first sequence includes at least one subsequence and the second sequence includes at least one subsequence;

Wherein, each subsequence includes basic sequence and phase information, phase information in the first sequence is used to indicate priority indication information, and phase information in the second sequence is used to represent broadcast channel information update indication information.

In a possible design, after the receiver receives the second synchronization subframe signal sent by the other communication device in the target subframe, the processor is further configured to determine the first synchronization subframe signal and the second synchronization corresponding to the target subframe. Whether the subframe signal is consistent; if the first synchronization subframe signal and the second synchronization subframe signal corresponding to the target subframe are inconsistent, the processor updates the first synchronization subframe signal according to the second synchronization subframe signal; the processor passes the transmitter Sending the updated first sync subframe signal.

In one possible design, the first synchronization subframe signal includes a first synchronization signal and first broadcast information, and the second synchronization subframe signal includes a second synchronization signal and second broadcast information.

In a possible design, when the processor updates the first synchronization subframe signal according to the second synchronization subframe signal, it is specifically used for at least one of the following:

Updating the first broadcast information according to the second broadcast information;

The first synchronization signal is updated according to the second synchronization signal.

In a possible design, the transmitter is specifically configured to send the updated first synchronization subframe signal by using the synchronization subframe in the next cycle of the period in which the target subframe is located.

In a possible design, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device is the same as the synchronization subframe corresponding to the other communication device.

In a possible design, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device is different from the synchronization subframe corresponding to other communication devices.

In a possible design, the transmitter is specifically configured to send the updated first synchronization subframe signal through the next synchronization subframe of the target subframe in the period in which the target subframe is located.

In one possible design, the processor updates the first broadcast information according to the second broadcast information, and updates the first synchronization signal according to the second synchronization signal.

In one possible design, the processor updates the first broadcast information according to the second broadcast information, and the second synchronization signal is different from the first synchronization signal.

In a third aspect, the present application provides a computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of the above first aspect.

In a fourth aspect, a program product, such as a computer readable storage medium, comprising the program of the third aspect is provided.

It can be seen that, in the above aspects, the target subframe is determined by the terminal from the periodic synchronization subframe, and the synchronization subframe signal is not transmitted in the target subframe, but the synchronization subframe signal sent by other terminals is received, so that the The terminal can update its own synchronization subframe signal by using the synchronization subframe signal sent by other terminals, and ensure that the synchronization subframe signal sent by the terminal and other terminals is the same after the target subframe, and the receiving end is prevented from receiving two in the same synchronization subframe. Different synchronization sub-frame signals can not correctly parse the signal, thus avoiding synchronization sub-frame collision.

DRAWINGS

FIG. 1 is an application scenario that may be applicable to an embodiment of the present application;

2 is a network architecture that may be applicable to an embodiment of the present application;

FIG. 3 is a schematic diagram of a communication scenario provided by an embodiment of the present application; FIG.

4 is a schematic diagram of a synchronization subframe provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a synchronization subframe signal according to an embodiment of the present application;

FIG. 6 is a schematic diagram of another synchronization subframe provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of a synchronization method according to an embodiment of the present application;

FIG. 8 is a schematic diagram of another communication scenario according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of still another synchronization subframe according to an embodiment of the present application;

FIG. 10 is a schematic diagram of still another communication scenario according to an embodiment of the present application;

FIG. 11 is a schematic diagram of still another communication scenario according to an embodiment of the present application;

FIG. 12 is a schematic diagram of still another synchronization subframe according to an embodiment of the present application;

FIG. 13 is a schematic diagram of still another synchronization subframe according to an embodiment of the present application;

FIG. 14 is a schematic diagram of still another synchronization subframe according to an embodiment of the present application;

FIG. 15 is a schematic structural diagram of another synchronization subframe signal according to an embodiment of the present disclosure;

FIG. 16 is a schematic structural diagram of priority indication information according to an embodiment of the present disclosure;

FIG. 17 is a schematic structural diagram of broadcast channel information update indication information according to an embodiment of the present disclosure;

FIG. 18 is a schematic structural diagram of still another synchronization subframe signal according to an embodiment of the present application.

FIG. 19 is a schematic diagram of still another synchronization subframe according to an embodiment of the present application;

FIG. 20 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure;

FIG. 21 is a schematic structural diagram of another communication device according to an embodiment of the present application.

detailed description

The possible application scenarios and network architecture of the embodiments of the present application are first described below with reference to FIG. 1 and FIG.

FIG. 1 is an application scenario that may be applicable to an embodiment of the present application. As shown in FIG. 1, the terminal accesses a core network (Core Network, CN) through a Radio Access Network (RAN). The technical solution described in this application can be applied to a Long Term Evolution (LTE) system. In addition, it can also be applied to subsequent evolution systems of the LTE system, such as a 5th Generation (5G) system. For the sake of clarity, only the LTE system is taken as an example here. In the LTE system, an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) is used as a wireless connection. Network access, Evolved Packet Core (EPC) as the core network. It should be noted that the name of the base station and the terminal may change when the solution of the embodiment of the present application is applied to the 5G system or other systems that may occur in the future, but this does not affect the implementation of the solution in the embodiment of the present application.

Some of the terms used in the present application are explained below so as to be understood by those skilled in the art.

1) A terminal, also called a User Equipment (UE), is a device that provides voice and/or data connectivity to a user, for example, a handheld device with a wireless connection function, an in-vehicle device, and the like. Common terminals include, for example, mobile phones, tablets, notebook computers, PDAs, mobile internet devices (MIDs), wearable devices such as smart watches, smart bracelets, pedometers, and the like.

In this embodiment, the terminal may be a terminal in a car network, and the terminal in the car network may be a vehicle-mounted terminal (Vehicle-UE, V-UE) or a handheld terminal (Pedestrian UE, P-UE), or It is another terminal that supports V2X function. Unless otherwise specified, the terminal in this application may be any one of them.

2) A base station, also known as a radio access network (RAN) device, is a device that accesses a terminal to a wireless network, and includes base stations in various communication systems, including but not limited to: transmission and reception. Transmission Reception Point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (Base Station Controller, BSC), Base Transceiver Station (BTS), home base station (for example, Home evolved NodeB, or Home Node B, HNB), BaseBand Unit (BBU). In addition, a Wifi Access Point (AP) or the like may also be included.

In this embodiment, the base stations in the communication systems of different communication systems are different. For the sake of distinction, the base station of the 4G communication system is referred to as an LTE eNB, the base station of the 5G communication system is referred to as an NR gNB, and the base station supporting both the 4G communication system and the 5G communication system is referred to as an eLTE eNB, and these names are only convenient distinctions, and Not limited.

3) "Multiple" means two or more, and other quantifiers are similar. "and/or", describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately. The character "/" generally indicates that the contextual object is an "or" relationship.

In the application scenario shown in FIG. 1, FIG. 2 is a network architecture that may be applicable to an embodiment of the present application. The network architecture mainly includes a base station 110 and a terminal 120, and the base station 110 and the terminal 120 perform wireless communication.

Please refer to FIG. 3 , which is a schematic diagram of a communication scenario according to an embodiment of the present application. As shown in FIG. 3, UE1-UE4 are terminals in the Internet of Vehicles, UE1 is within the coverage of the eNB, UE2-UE5 is outside the coverage of the eNB, and UE3 can receive the Global Navigation Satellite System (Global Navigation Satellite System). GNSS) Synchronization signal and/or timing signal transmitted. Each terminal synchronizes with other terminals by transmitting a synchronization subframe signal including a synchronization signal, a broadcast message transmitted in the broadcast channel, and a demodulation reference signal for demodulating the broadcast message, the synchronization signal may be Sidelink Synchronization Signal (SLSS), SLSS includes Primary Sidelink Synchronization Signal (PLSS) and Secondary Sidelink Synchronization Signal (SSSS). SLSS is a periodic signal with a period of 160 ms, the SLSS transmission period may include a synchronization subframe, and the synchronization subframe is also referred to as a synchronization resource, and each synchronization subframe signal occupies one synchronization subframe.

For terminals within the network coverage or terminals outside the network coverage, each terminal transmits SLSS using only one synchronization subframe in one SLSS transmission period T.

Outside the network coverage, there are three configurations of synchronization subframes in each SLSS transmission period: 0 synchronization subframes, 2 synchronization subframes, and 3 synchronization subframes; each SLSS transmission is within the network coverage. There are two configurations of the number of synchronization subframes in a cycle: 0 synchronization subframes and 1 synchronization subframe. Configuring 0 synchronization resources indicates that the UE cannot send the SLSS. Outside the network coverage, two synchronization subframes are configured in each SLSS transmission period as an example. As shown in FIG. 4, T represents a SLSS transmission period, and t1 and t2 respectively represent synchronization subframes, that is, t1 represents a SLSS transmission period T. The first sync subframe, t2 represents the second sync subframe in the SLSS transmission period T. Similarly, the next period of the SLSS transmission period T shown in FIG. 4 and the subsequent period of the next period also include two synchronization subframes. Optionally, one synchronization subframe occupies 1 ms in the time domain, and the frequency domain occupies 6 resource blocks (RBs) in the center of the frequency band, and each RB has 12 subcarriers in the frequency domain.

In the embodiment of the present application, the structure of the synchronization subframe signal is specifically shown in FIG. 5. As shown in FIG. 5, one synchronization subframe signal occupies one synchronization subframe, and one synchronization subframe signal includes 14 symbols, where Two symbols are used to carry the PSSS, two symbols are used to carry the SSSS, three symbols are used to carry the Demodulation Reference Signal (DMRS), and the first symbol is used to carry the automatic gain control (Auto Gain Control, AGC). The information, the last symbol is vacant, that is, the GAP, and the remaining symbols are used to carry the broadcast message transmitted in the broadcast channel, and the broadcast channel may specifically be a Physical Side Broadcast Channel (PSBCH). The GAP is mainly used for the transmission and reception of the UE. If the shared resource is used with the Uu link, it can also be used to protect the uplink transmission on the Uu link. The so-called transceiving conversion refers to the UE transitioning from the receiving state to the transmitting state, or from the transmitting state to the receiving state.

In addition, each symbol further includes a Cyclic Prefix (CP), which may be a regular cyclic prefix, and the length of the regular cyclic prefix is about 4.7 us, and an Orthogonal Frequency Division Multiplexing (OFDM) The length of the symbol is about 66.7us, so the length of a symbol containing a CP is 71.4us. In addition, the transceiving conversion time is about 20 us, that is, the length of time required for the UE to transition from the receiving state to the transmitting state, or the length of time required to switch from the transmitting state to the receiving state is 20 us.

As shown in FIG. 3, the UE1 receives the synchronization signal sent by the eNB in the coverage of the eNB, and the synchronization signal may be a PSSS or an SSSS. The UE2 receives the SLSS sent by the UE1 outside the coverage of the eNB, and the UE3 is in the coverage of the eNB. In addition, UE3 receives the synchronization signal sent by the GNSS, and assumes that there are two synchronization subframes in each SLSS transmission period outside the coverage of the eNB, as shown in FIG. 6, 61, within the coverage of the eNB, each SLSS. One sync subframe is configured in the transmission period, as shown in FIG.

As shown in FIG. 3, the UE1 selects the first synchronization subframe in the SLSS transmission period T, that is, t1, to transmit the synchronization subframe signal, and the PSBCH used by the UE1 to transmit the broadcast message is configured by the eNB; the UE2 selects the SLSS within the transmission period T. The second synchronization subframe, t2, transmits the synchronization subframe signal; UE3 randomly selects the first synchronization subframe in the SLSS transmission period T, that is, t1, to transmit the synchronization subframe signal, and the PSBCH used by UE3 to transmit the broadcast message is pre-configured. The broadcast message transmitted by UE1 in the PSBCH and the broadcast message transmitted by UE3 in the PSBCH may be different. Since the terminal is mobile, both UE1 and UE3 transmit a synchronization subframe signal in the first synchronization subframe in the SLSS transmission period T, that is, t1, and when UE3 moves to the edge of the coverage of the eNB, it is closer to UE1 and UE3. UE2 may receive the synchronization subframe signals sent by UE1 and UE3 at the same time in the same synchronization subframe, if UE1 and UE3 The synchronization signals respectively transmitted by the SLSS are different, and/or the broadcast message transmitted by the UE1 in the PSBCH is different from the broadcast message transmitted by the UE3 in the PSBCH, which causes the UE2 to receive two different synchronization subframe signals in the same synchronization subframe. The UE2 will not be able to correctly parse the signal. This application refers to this phenomenon as a synchronization subframe collision.

It can be seen that in the existing car network system, there is a problem of synchronization subframe collision. In order to solve the problem, the embodiment of the present application uses the method of discarding the synchronization subframe to reduce the probability of the synchronization subframe conflict. It should be noted that the discarding the synchronization subframe means that the terminal in the time domain corresponds to the time period corresponding to the synchronization subframe. The terminal does not send a signal, and the terminal in the frequency domain does not send a signal on the resource block corresponding to the synchronization subframe, and the terminal detects or receives the synchronization subframe signal sent by the other terminal in the synchronization subframe in the synchronization subframe. The following specific embodiments are provided in the following application. The following describes the embodiments in combination with specific scenarios:

FIG. 7 is a schematic flowchart of a synchronization method according to an embodiment of the present disclosure; as shown in FIG. 7, the method includes:

Step S701: The first terminal determines a target subframe in a synchronization subframe, where the synchronization subframe is used to send a first synchronization subframe signal, and the first terminal does not send the first synchronization subframe in the target subframe. Frame signal.

Step S702: The first terminal receives the second synchronization subframe signal sent by the second terminal in the target subframe.

FIG. 8 is a schematic diagram of another communication scenario according to an embodiment of the present disclosure; FIG. 9 is a schematic diagram of still another synchronization subframe according to an embodiment of the present application. As shown in FIG. 8, UE1 is within the coverage of the eNB, UE2 and UE3 are outside the coverage of the eNB, and UE2 is at the edge of the coverage of the eNB, T represents the SLSS transmission period, and both UE1 and UE3 select the SLSS transmission period T. The first synchronization subframe, that is, t1, transmits a synchronization subframe signal, and UE2 selects a second synchronization subframe in the SLSS transmission period T, that is, t2, to transmit a synchronization subframe signal, and the synchronization subframe signals respectively transmitted by UE1, UE2, and UE3 may The same, or they may be different from each other. In addition, in this embodiment, the synchronization subframe signal sent by the UE3 on the synchronization subframe t1 is recorded as the first synchronization subframe signal, and the synchronization subframe signal sent by the UE1 on the synchronization subframe t1 is recorded as the second synchronization subframe signal. The first synchronization subframe signal and the second synchronization subframe signal may be the same or different.

In a specific embodiment of the present application, as shown in FIG. 9, the UE3 determines a target subframe from the periodic synchronization subframe t1, for example, the UE3 transmits the second SLSS transmission period T shown in FIG. The synchronization subframe t1 is determined as the target subframe. Since both UE1 and UE3 select the first synchronization subframe in the SLSS transmission period T, that is, the t1 transmission synchronization subframe signal, it can be seen that UE1 transmits the second subframe in the target subframe. The structure of the synchronization subframe signal shown in FIG. 9 is the same as the structure of the synchronization subframe signal shown in FIG. 5, and specific symbols are not described herein again. However, after determining the target subframe from the periodic synchronization subframe t1, the UE3 does not transmit the first synchronization subframe signal in the target subframe, but receives the second synchronization subframe signal sent by the UE1. The UE3 may update the first synchronization subframe signal corresponding to the UE3 by using the second synchronization subframe signal sent by the UE1, or the UE3 may send the second synchronization subframe signal in the synchronization subframe after the target subframe, so that the UE3 and the UE1 are in the target subframe. The synchronization subframe after the frame transmits the same synchronization subframe signal. If the UE2 receives the synchronization subframe signal sent by the UE3 and the UE1 in the same synchronization subframe, the two synchronization subframe signals received by the UE2 are guaranteed to be the same.

FIG. 10 is a schematic diagram of still another communication scenario according to an embodiment of the present disclosure. As shown in FIG. 10, UE1 receives a synchronization signal sent by an eNB within a coverage of an eNB, and a PSBCH used by UE1 to transmit a broadcast message is configured by an eNB. UE3 is outside the coverage of the eNB, UE3 receives the synchronization signal sent by the GNSS, and the PSBCH used by UE3 to transmit the broadcast message is pre-configured; the broadcast message transmitted by UE1 in the PSBCH and the broadcast message transmitted by UE3 in the PSBCH may be different, in order to Resolving the coverage of the PSBCH and eNB configured within the coverage of the eNB The pre-configured PSBCH is different and causes a signal collision problem. The UE3 obtains a message broadcast by the UE1 on the PSBCH from the synchronization subframe signal sent by the UE1, and updates the message broadcast by the UE3 on the PSBCH with the message broadcast by the UE1 on the PSBCH, after the update. UE1 and UE3 will each transmit the SLSS and the broadcast message transmitted in the PSBCH on the same synchronization subframe. Since UE3 is mobile, if UE3 needs to update the message broadcasted by UE3 on the PSBCH again, UE3 needs to listen to the message broadcast by UE1 on the PSBCH. Since UE1 and UE3 send SLSS and broadcast messages on the same synchronization subframe, therefore, UE3 drops or skips a certain synchronization subframe, that is, determines a target subframe in the synchronization subframe, as shown in FIG. 9, and does not transmit the SLSS and the transmission in the PSBCH in the target subframe. Broadcasting the message, but receiving the SLSS transmitted by the UE1 on the target subframe and the broadcast message transmitted in the PSBCH, and the UE3 receives the SLSS transmitted by the UE1 on the target subframe and the broadcast message transmitted in the PSBCH, and then uses again. The message broadcast by UE1 on the PSBCH updates the message that UE3 broadcasts on the PSBCH.

FIG. 11 is a schematic diagram of still another communication scenario according to an embodiment of the present disclosure. As shown in FIG. 11 , UE1 receives a synchronization signal sent by an eNB within a coverage of an eNB, and a PSBCH used by UE1 to transmit a broadcast message is configured by an eNB. The UE2 and the UE5 are both outside the coverage of the eNB. The difference between the UE2 and the UE5 is that the UE2 receives the synchronization signal sent by the UE1 in the coverage of the eNB, and the UE5 does not receive the synchronization signal sent by the UE1. A UE that does not receive a synchronization signal transmitted by a UE within the coverage of any eNB, such as UE 5, is called a standalone OoC UE outside the coverage area. When the UE5 sends the SLSS, it randomly selects one synchronization subframe from the pre-configured synchronization subframes, and the synchronization subframe used by the UE1 to send the SLSS is configured by the eNB. If the UE 5 randomly selects the synchronization subframe and the eNB configuration The synchronization subframes of the UE1 are the same, and the SLSS sent by the UE5 is different from the SLSS sent by the UE1. The UE2 may receive the SLSS sent by the UE5 and the SLSS sent by the UE1, and the UE2 cannot correctly parse the signal, causing the synchronization subframe conflict. To solve this problem, the UE 5 drops or skips a certain synchronization subframe, that is, determines a target subframe in the synchronization subframe, as shown in FIG. 9, and does not send the SLSS and the target subframe. The broadcast message transmitted in the PSBCH, but the higher priority UE, such as the SLSS transmitted by UE1 and the broadcast message transmitted in the PSBCH.

In this embodiment, the terminal determines the target subframe from the periodic synchronization subframe, and does not send the synchronization subframe signal in the target subframe, but receives the synchronization subframe signal sent by other terminals, so that the terminal can pass the terminal. The synchronization subframe signal sent by the other terminal updates its own synchronization subframe signal to ensure that the synchronization subframe signal sent by the terminal and other terminals is the same after the target subframe, and the receiving end avoids receiving two different ones in the same synchronization subframe. The sub-frame signal is synchronized and the signal cannot be parsed correctly, thereby avoiding synchronization subframe collision.

On the basis of the foregoing embodiment, the UE3 or the UE5 drops or skips a certain synchronization subframe, that is, the method for determining the target subframe in the synchronization subframe, which may be specifically classified into the following feasible implementation manners. :

In a feasible implementation manner, the UE3 or the UE5 periodically discards the synchronization subframe, and the discarded synchronization subframe is the target subframe.

In another feasible implementation manner, the UE3 or the UE5 randomly discards the synchronization subframe, and the discarded synchronization subframe is the target subframe.

In another possible implementation manner, the designated symbol in the synchronization subframe signal sent by the terminal may be used to carry the priority indication information of the terminal and/or the broadcast channel information update indication information, and optionally, the designated symbol in the synchronization subframe signal. It is the GAP symbol shown in FIG. 5. Taking UE3 as an example, the synchronization subframe signal sent by UE3 is recorded as the first synchronization subframe signal, and the synchronization subframe signal sent by UE1 is recorded as the second synchronization subframe signal, and UE3 discards some Synchronizer The designated symbol of the first synchronization subframe signal in the frame, the designated symbol in the discarded synchronization subframe signal means that the terminal does not transmit a signal at a time position or a time period corresponding to the designated symbol, but receives other terminals such as UE1. The designated symbol of the second sync subframe signal transmitted by the sync subframe. The UE3 determines, according to the designated symbol of the second synchronization subframe signal, whether the priority of the UE1 is higher than the priority of the UE3, and/or whether the broadcast channel information of the UE1 has been updated, and if the priority of the UE1 is higher than the priority of the UE3, And/or, the broadcast channel information of the UE1 is updated, and the UE3 drops or skips the next synchronization subframe, and the next synchronization subframe and the synchronization subframe are separated by one cycle, that is, after the synchronization subframe. The sync subframe in which one cycle occurs is the target subframe.

For the above-mentioned several possible implementations, it should be noted that when the terminal is in the coverage of the eNB, the eNB determines the rule for the terminal to discard the synchronization subframe, and the rule includes a periodic discarding mode or a random discarding mode, if the terminal is The eNB can also determine different discarding modes according to different scenarios. For example, in an urban environment, the vehicle trajectory has a large gap, and the eNB can instruct the terminal to discard the sync subframe by using a random discard mode. On the road, the vehicle trajectory is similar, and the eNB can instruct the terminal to discard the synchronization subframe by using the periodic discard mode. When the terminal is outside the coverage of the eNB, the terminal may pre-configure the synchronization subframe discarding mode, that is, the periodic discarding mode or the random discarding mode. If the terminal supports the two discarding modes, the eNB may further determine according to different scenarios. Different ways of discarding.

The following is a detailed description of several feasible implementation manners for determining the target subframe in the synchronization subframe by using the foregoing terminal in combination with a specific scenario:

For the manner in which the terminal periodically discards the synchronization subframe, the terminal may discard the k synchronization subframes every N periods T, 0≤k≤N, which is the transmission period of the synchronization subframe signal, and the period is The sync subframe is included. (k, N) is configurable, and it can be selected that N remains unchanged, k is variable, or k is 0 or 1, and N is variable. Where k is a value of 0, the terminal does not discard the synchronization subframe. Specifically, (k, N) may be determined according to priority information of the terminal.

Since the eNB can configure the timing of the UE to use the eNB, or use the timing of the GNSS, the priority order of the UE is different in the two different timing modes. Therefore, the mapping relationship between the parameter (k, N) and the terminal priority information exists in two. However, as long as the timing mode of the UE is determined, the mapping relationship between the parameter (k, N) and the terminal priority information can be determined.

Table 1 shows an example of the mapping relationship between different terminal priority information and (k, N):

Table 1

In Table 1, P1 has the highest priority, and P5 has the lowest priority. From P1 to P5, the priority is sequentially decreased. As shown in FIG. 3, the priority information of the terminal can be determined according to the following rules: UE1 is in the coverage of the eNB, and UE1 directly receives the synchronization signal sent by the eNB, and the priority information of UE1 is P1; UE2 Outside the coverage of the eNB, the UE2 cannot directly receive the synchronization signal sent by the eNB, but the UE2 receives the synchronization signal sent by the UE1 in the coverage of the eNB, and the priority information of the UE2 is P2; the UE3 is outside the coverage of the eNB, and The UE3 directly receives the synchronization signal sent by the GNSS, and the priority information of the UE3 is P3; the UE4 does not directly receive the synchronization signal sent by the GNSS outside the coverage of the eNB, but receives the synchronization signal sent by the UE3, that is, the UE4 indirectly receives the GNSS transmission. For the synchronization signal, the priority information of the UE4 is P4; the UE5 is out of the coverage of the eNB, and does not receive the synchronization signal sent by the UE1 in the coverage of the eNB, that is, the UE5 is an independent UE outside the coverage, and the UE5 is The priority information is P5.

As can be seen from the last column of Table 1, the lower the priority of the terminal, the smaller N is. It can be seen from the middle column of Table 1. If N is fixed, the lower the priority of the terminal, the larger the k, the terminal with the priority of P1 does not discard the synchronization subframe, and the terminal with the priority of P2 is discarded every 3 cycles. For a synchronization subframe, the priority information of the UE1 is P1, and the priority information of the UE2 is P2. If both the UE1 and the UE2 select the first synchronization subframe t1 in each period T, the synchronization subframe signal is sent, in order to avoid the synchronization. The subframe conflicts, in the four periods T shown in FIG. 12, the UE1 may not discard the synchronization subframe according to the priority information of the UE1, and the UE2 may discard one synchronization subframe every three cycles T, as shown in FIG. The shaded portion is the first synchronization subframe t1 in the third period T shown in FIG. 12, and the UE2 determines that it discards one synchronization subframe every three periods T according to the priority information of the UE2, and the UE2 can The first synchronization subframe t1 in the third period T shown in FIG. 12 is used as the target subframe, and the synchronization subframe signal is not transmitted in the target subframe. If the UE2 receives the synchronization subframe signal sent by the higher priority UE1 in the target subframe, the UE2 may update the synchronization subframe signal of the UE2 according to the synchronization subframe signal sent by the UE1. Specifically, the UE2 may send the SLSS to update the UE2 according to the UE1. The SLSS updates the PSBCH information of the UE2 according to the PSBCH information of the UE1. After the target subframe, UE2 may send the updated SLSS and PSBCH information, so as to prevent the receiving end from receiving the synchronization subframe signal sent by UE2 and UE1 at the same time.

For the terminal in the coverage of the eNB, at least one of the terminal acquiring the parameters k, N, and the terminal priority information may be implemented as follows:

In a feasible implementation manner, the terminal receives configuration information sent by the eNB, where the configuration information includes at least one of N, k, and the terminal priority information.

In another possible implementation manner, the terminal pre-stores at least one of N, k, and the terminal priority information.

For the terminal in the coverage of the eNB, the mapping relationship between the terminal acquiring parameters (k, N) and the terminal priority information may be implemented as follows:

In a feasible implementation manner, the eNB broadcasts a mapping relationship between the parameter (k, N) and the terminal priority information to the terminal through a System Information Block (SIB) message.

In another feasible implementation manner, the mapping relationship between the parameter (k, N) and the terminal priority information is determined in a pre-configured manner, and the mapping relationship between the parameter (k, N) and the terminal priority information is stored in the UE.

For a terminal outside the coverage of the eNB, the terminal may pre-store at least one of N, k, and priority information of the terminal; in addition, determine a mapping of the parameter (k, N) and the terminal priority information by using a pre-configured manner. Relationship, and the mapping relationship between the parameter (k, N) and the terminal priority information is stored in the UE.

Optionally, the terminal discards the synchronization subframe according to a preset probability, where the probability indicates that the terminal does not send the synchronization subframe signal in the synchronization subframe. The terminal discards the synchronization subframe according to the preset probability by adopting the following feasible implementation manners:

In a feasible implementation manner, each UE discards the synchronization subframes with the same probability. For example, in each SLSS transmission opportunity, the probability that each UE discards the synchronization subframe is 0.5. The drop probability adopted by each UE may be sent by the eNB to each UE through an SIB message, or may be pre-stored in the UE in a pre-configured manner.

Another feasible implementation manner is that, for different priority UEs, the drop probability is different. For example, the lower the priority of the UE, the greater the probability that the UE discards the synchronization subframe. The mapping relationship between the priority information of the UE and the probability of the UE dropping the synchronization subframe may be sent by the eNB to each UE through an SIB message, or may be pre-stored in the UE in a pre-configured manner.

Since the eNB can configure the timing of the eNB to use the eNB, or the timing of using the GNSS, the priority order of the UE is different in the two different timing modes. Therefore, there are two mapping relationships between the drop probability and the terminal priority information, but only After the timing mode of the UE is determined, the mapping relationship between the drop probability and the terminal priority information can be determined.

Table 2 shows an example of the mapping relationship between different terminal priority information and drop probability:

Table 2

Terminal priority information Discard probability P1 0 P2 0.2 P3 0.4 P4 0.6 P5 0.8

The terminal discards the synchronization subframe according to the SIB message sent by the eNB, or according to the pre-configured drop probability, and does not send the signal in the discarded synchronization subframe, but receives the synchronization subframe signal sent by other terminals, if a higher priority is received. The synchronization subframe signal sent by the UE is updated according to the synchronization subframe signal sent by the higher priority UE.

It can be seen from the last column of Table 2 that the lower the priority of the terminal, the greater the probability that the terminal discards the synchronization subframe. For example, the priority information of the UE1 is P1, and the drop probability corresponding to P1 is 0, indicating that the UE1 does not discard the synchronization subframe, the priority information of the UE4 is P4, and the drop probability corresponding to P4 is 0.6, indicating the probability that the UE4 discards the synchronization subframe. As shown in FIG. 13, UE1 does not discard the synchronization subframe, and UE4 discards two synchronization subframes, and the shaded portion shown in FIG. 13 is the synchronization subframe discarded by UE4.

In this embodiment, the terminal periodically or randomly discards the synchronization subframe, so that the terminal does not send the synchronization subframe signal in the discarded synchronization subframe, but receives the synchronization subframe signal sent by other terminals, so that the terminal can send through other terminals. The synchronization subframe signal updates its own synchronization subframe signal, and ensures that after the synchronization subframe is discarded, the terminal and the synchronization subframe signal sent by other terminals are the same, and the receiving end avoids receiving two different synchronization subframes in the same synchronization subframe. The signal does not resolve the signal correctly, thus avoiding synchronization subframe collisions.

In the foregoing embodiment, the synchronization subframe is periodically or randomly discarded by the terminal to prevent the synchronization subframe from being generated by the receiving end, but the synchronization subframe is periodically or randomly discarded, which may cause the receiving end to receive the synchronization subframe signal for a long time. As a result, the receiving end cannot synchronize with other terminals, which affects the synchronization performance of the receiving end. In order to solve the problem, in another specific embodiment of the present application, a hybrid discarding method is provided, and the hybrid discarding method includes the following two steps:

Step 1, symbol discard

The terminal discards the designated symbol in the synchronization subframe signal. The so-called discarding of the designated symbol means that the terminal does not transmit a signal at a time position or a time period corresponding to the designated symbol, but receives a designated symbol sent by another terminal. The designated symbol can be used to carry the priority indication information of the terminal and/or the broadcast channel information update indication information. Optionally, the designated symbol is the last symbol of the synchronization subframe signal, that is, the last symbol GAP shown in FIG.

Step 2. Synchronous subframe discarding

According to the designated symbols sent by other terminals, it is judged whether the priorities of other terminals are higher, and/or whether the broadcast channel information of other terminals has been updated. If the priorities of other terminals are higher, and/or the broadcast channel information of other terminals has been updated, the terminal discards the next synchronization subframe, and the next synchronization subframe and the synchronization subframe are separated by one cycle.

FIG. 14 is a schematic diagram of still another synchronization subframe according to an embodiment of the present application. The hybrid discarding method is explained below with reference to FIG. 14. In FIG. 14, UE1 has a higher priority, UE1 does not perform the operation of discarding the designated symbol or discarding the synchronization subframe, and UE1 selects the first synchronization subframe in the SLSS transmission period T, that is, t1, to transmit the synchronization subframe signal, and The last symbol of each synchronization subframe signal carries priority indication information of UE1 and/or broadcast channel information update indication information. The UE3 has a lower priority, and selects the first synchronization subframe in the SLSS transmission period T, that is, t1, to transmit the synchronization subframe signal, and the UE3 may carry the priority indication information of the UE3 in the last symbol of each synchronization subframe signal. / or broadcast channel information update indication information, may not carry the foregoing indication information.

In the first SLSS transmission period T shown in FIG. 14, as shown in step S1, UE3 discards the last symbol of the synchronization subframe signal it transmits, and optionally, UE3 periodically or randomly discards the last symbol. For the method of periodically or randomly discarding the last symbol, refer to the method for periodically or randomly dropping the synchronization subframe by the terminal in the foregoing embodiment, and details are not described herein again. The UE3 does not transmit a signal in the time period corresponding to the last symbol, but detects the last symbol of the synchronization subframe signal sent by the UE1 in the first synchronization subframe t1 in the first SLSS transmission period T, which is the designated symbol transmitted by the UE1. a symbol, if the UE3 determines that the priority of the UE1 is higher than the priority of the UE3 according to the specified symbol sent by the UE1, and/or the broadcast channel information of the UE1 has been updated, the UE3 discards the second SLSS transmission period as shown in step S2. The first synchronization subframe t1 in T, that is, the first synchronization subframe t1 in the second SLSS transmission period T, does not transmit a signal, but receives the synchronization subframe signal transmitted by UE1. In the third SLSS transmission period T, UE3 updates the synchronization subframe signal of UE3 with the synchronization subframe signal transmitted by UE1, and the first synchronization subframe t1 or the second synchronization in the third SLSS transmission period T The subframe t2 transmits the updated sync subframe signal.

In this embodiment, the terminal first discards the designated symbol in the synchronization subframe signal, receives the designated symbol sent by the other terminal in the time period corresponding to the designated symbol, and determines whether the priority of the other terminal is determined according to the designated symbol sent by the other terminal. Higher, and/or, whether the broadcast channel information of other terminals has been updated, if the priorities of other terminals are higher, and/or the broadcast channel information of other terminals has been updated, the terminal discards the next synchronization subframe, due to the designation The time occupied by the symbol is less than the time occupied by the synchronization subframe. Compared with the periodic or random discarding of the synchronization subframe, the receiving end is prevented from receiving the synchronization subframe signal for a long time, thereby reducing the synchronization of the receiving end. The impact of performance.

In the embodiment shown in FIG. 14, the last symbol of the synchronization subframe signal can be used to carry the priority indication information of the terminal and/or the broadcast channel information update indication information. The last of the synchronization subframe signal will be described in detail below. A structural diagram of a symbol.

FIG. 15 is a schematic structural diagram of another synchronization subframe signal according to an embodiment of the present disclosure. As shown in FIG. 15, the length of the synchronization subframe signal is 1 ms, and the synchronization subframe signal includes 14 symbols. The first 13 symbols are not described here, and the structure of the last symbol GAP is mainly described here, as shown in FIG. The GAP includes a CP, N short sequences Seq1-SeqN, and a transceiving conversion time, wherein the length of the CP is about 4.7 us, and the length of the GAP is about 71.4 us, in order to ensure the transmission and reception transition time of the UE (Tx/Rx Switching). And simplifying the information indication and detection mode, the symbol is designed to be composed of a plurality of equal length sequences Seq1-SeqN in the time domain, and Seq1-SeqN is used for carrying the terminal's priority indication information and/or the broadcast channel information update indication information. For example, consecutive 2-3 short sequences are selected from Seq1-SeqN to indicate priority indication information of the terminal, and consecutive 2 short sequences are selected from Seq1-SeqN to indicate broadcast channel information update indication information of the terminal, which is used to indicate A short sequence of priority indication information of the terminal and a short sequence for indicating broadcast channel information update indication information are referred to as an information sequence.

In order that the receiving end can detect the information described above in a simple manner, any short sequence of Seq1-SeqN can be expressed as a basic sequence multiplied by phase 1 or phase-1, so that even if the receiving UE and the transmitting UE are not Synchronization, the receiving UE can also detect the basic sequence and phase through correlation operations.

Further, considering the influence of the channel gain, the shortest sequence in the Seq1-SeqN is selected as the reference sequence, and the reference sequence is in front of the information sequence, and the reference sequence does not carry any information bits, so that the receiving UE can detect by the differential method. Information bits in the sequence of information following the reference sequence. For example, Seq1 and Seq2 in Seq1-SeqN are selected as reference sequences, and the phase of each short sequence in the reference sequence is 1.

The basic sequence can be obtained by puncturing a known sequence such as a DMRS sequence in the frequency domain. The so-called puncturing of the known sequence means that in the frequency domain of the known sequence, every M subcarriers are equally spaced. By inserting M-1 zeros consecutively, that is, puncturing M-1 subcarriers, M identical sequences can be obtained in the time domain, wherein any one of the M identical sequences is the basic sequence.

The basic sequence A is taken as an example to describe how to carry information bits on a short sequence. As shown in FIG. 16, two short sequences such as Seq3 and Seq4 are used to indicate the priority indication information of the terminal, and Seq3 can be expressed as a basic sequence A multiplied. In phase 1 or phase-1, Seq4 can be expressed as the basic sequence A multiplied by phase 1 or phase-1, ie Seq3 can be A or -A, Seq4 can be A or -A, then Seq3 and Seq4 can be combined in 4 ways. , ie (A, A), (A, -A), (-A, A), (-A, -A), visible, the phase of (A, A) is (1, 1), (A, - The phase of A) is (1, -1), the phase of (-A, A) is (-1, 1), and the phase of (-A, -A) is (-1, -1), if phase + 1 denotes bit 1, phase-1 denotes bit 0, then (1,1) corresponds to bit (1,1), (1,-1) corresponds to bit (1,0), (-1,1) corresponds to bit (0) , 1), (-1, -1) corresponding to bits (0, 0), then the sequence (A, A) can carry information bits (1, 1), and the sequence (A, -A) can carry information bits (1, 0), sequence (-A, A) can carry information bits (0, 1), sequence (-A, -A) can carry information bits (0, 0), 4 groups of bit information can represent 4 different priorities , an achievable advantage The first-level correspondence is: (1, 1) corresponds to the priority P1, (1, 0) corresponds to the priority P2, (0, 1) corresponds to the priority P3, and (0, 0) corresponds to the priority P4, therefore, (A A) may indicate priority P1, (A, -A) may indicate priority P2, (-A, A) may indicate priority P3, and (-A, -A) may indicate priority P4.

As shown in FIG. 17, the broadcast channel information update indication information of the terminal is represented by two short sequences such as Seq5 and Seq6, Seq5 can be expressed as the basic sequence A multiplied by phase 1 or phase-1, and Seq6 can be expressed as the basic sequence A multiplied by Phase 1 or Phase-1, ie Seq5 can be A or -A, Seq6 can be A or -A, then Seq5 and There are four combinations of Seq6, namely (A, A), (A, -A), (-A, A), (-A, -A), and the phase of (A, A) is (1, 1). ), the phase of (A,-A) is (1,-1), the phase of (-A,A) is (-1,1), and the phase of (-A,-A) is (-1,-1) ), if phase 1 represents bit 1 and phase-1 represents bit 0, then (1, 1) corresponds to bit (1, 1), and (1, -1) corresponds to bit (1, 0), (-1, 1) Corresponding bits (0, 1), (-1, -1) corresponding bits (0, 0), then the sequence (A, A) can carry information bits (1, 1), the sequence (A, -A) can The bearer information bits (1, 0), the sequence (-A, A) can carry information bits (0, 1), and the sequence (-A, -A) can carry information bits (0, 0).

The terminal may periodically update the broadcast channel information, and the broadcast channel information update indication information may be represented by a differential manner. For example, the first short sequence shown in FIG. 17 indicates that the broadcast channel information of the previous cycle is compared with the previous cycle. Whether the broadcast channel information is updated, and the second short sequence indicates whether the broadcast channel information of the current cycle is updated compared to the broadcast channel information of the previous cycle. Optionally, a short sequence with a phase of +1 indicates that there is an update, a short sequence with a phase of -1 indicates that there is no update, and Table 3 shows a mapping relationship between a short sequence phase and a broadcast channel information update indication information. Example:

table 3

Since the UEs outside the coverage of the eNB adopt the preset broadcast channel information, the broadcast channel information update indication information is mainly used by the UEs within the coverage of the eNB, that is, the UE in the coverage of the eNB needs to be the last one of the synchronization subframe signals. The symbol carries broadcast channel information update indication information. After transmitting the priority indication information of the terminal and/or the broadcast channel information update indication information, the UE transmits the last 13 symbols of the synchronization subframe signal together with the first 13 symbols of the synchronization subframe signal.

In this embodiment, by updating the indication information by using the priority indication information of the terminal and/or the broadcast channel information of the last symbol of the synchronization subframe signal, the terminal can detect and receive by discarding the last symbol of the local synchronization subframe signal. Sending the last symbol of the synchronization subframe signal sent by the other terminal, and obtaining the priority information of the other terminal and/or the update information of the broadcast channel information of other terminals according to the last symbol of the synchronization subframe signal sent by the other terminal, so that the terminal The priority information of other terminals and/or the update information of the broadcast channel information can be conveniently and efficiently obtained.

On the basis of the embodiment shown in FIG. 5, if the terminal transmits the first 13 symbols of the synchronization subframe signal, the terminal transits from the transmission state to the reception state at the start of the last symbol, because the terminal is converted from the transmission state to the reception state. The process requires a transceiving conversion time. Optionally, the transceiving conversion time is 20 us. Therefore, on the basis of FIG. 5, if the last indication of the synchronization sub-frame signal needs to carry the priority indication information of the terminal and/or When broadcasting the channel information update indication information, it is necessary to consider the first 20us of the last symbol of the synchronization subframe signal as the transmission/reception conversion time. Another structure of the last symbol of the synchronization subframe signal will be described below.

FIG. 18 is a schematic structural diagram of still another synchronization subframe signal according to an embodiment of the present application. Synchronization subframe One symbol in the signal includes a CP and an OFDM symbol. Therefore, when designing the last symbol of the synchronization subframe signal, a feasible implementation manner is to divide the OFDM symbol into M=16 equal parts, that is, an OFDM symbol. It is divided into 16 segments, as shown in Figure 18. The first 5 segments are used as the transmission and reception conversion time, the 6th segment is used as the reference sequence, the 7th segment and the 11th segment are used as the information sequence, and the last 5 segments are used as the transmission and reception conversion time. The sequence of the 7th segment-the 9th segment may be used to carry the priority indication information of the terminal, and the sequence of the 10th segment and the 11th segment may be used to update the indication information of the broadcast channel information of the terminal, or the sequence of the 7th segment and The eighth sequence is used to carry the broadcast channel information update indication information of the terminal, and the ninth sequence-11th sequence can be used to carry the priority indication information of the terminal.

Since the length of one OFDM symbol is 66.7us, the length of each sequence in the 16-segment sequence is 66.7/16=4.17us. The length of the CP is 4.7us, the length of the first 5 segments is 4.17*5=20.85us, and the total length of the CP and the first 5 segments is 20.85+4.7=25.55us, 25.55us is greater than 20us, therefore, the CP and the first 5 The segment sequence together as the transceiving conversion time is sufficient to support the terminal to transition from the transmitting state to the receiving state, or from the receiving state to the transmitting state.

On the basis of FIG. 18, if the synchronization subframe of the terminal in the first cycle is in the transmission state, and the synchronization subframe in the second cycle becomes the reception state, the synchronization subframe signal in the first cycle is The last 5 segments of the last symbol are punctured, where puncturing means that no signal is sent in the time domain. Similarly, if the synchronization subframe of the terminal in the first cycle is in the receiving state, and the synchronization subframe in the second cycle becomes the transmitting state, the last symbol of the synchronization subframe signal in the first cycle is the same. The last 5 segments of the sequence were punched.

In this embodiment, by designing the transceiving conversion time in front of the last symbol of the synchronization sub-frame signal, the terminal can be switched from the transmission state to the reception state or from the reception state at the start time of the last symbol of the synchronization sub-frame signal. To the transmission state without losing the signal, the integrity of the signal received or transmitted by the terminal is guaranteed.

According to the embodiment shown in FIG. 14, in step S2, the UE 3 discards the first synchronization subframe t1 in the second SLSS transmission period T, that is, the first synchronization sub-segment in the second SLSS transmission period T. The frame t1 does not transmit a signal, but receives the synchronization subframe signal transmitted by the UE1. After receiving the synchronization subframe signal sent by the UE1, the UE3 needs to compare whether the synchronization subframe signal sent by the UE1 and the synchronization subframe signal of the UE3 are consistent, if the synchronization subframe signal sent by the UE1 and the synchronization subframe signal of the UE3 are received by the UE3. If not, the UE3 updates the synchronization subframe signal of the UE3 according to the synchronization subframe signal sent by the UE1, and simultaneously transmits the updated synchronization subframe signal.

Since the synchronization subframe signal transmitted by the UE1 includes the SLSS and the broadcast message transmitted in the PSBCH, the synchronization subframe signal of the UE3 also includes the SLSS and the broadcast message transmitted in the PSBCH, but the SLSS transmitted by the UE1 and the SLSS of the UE3 may be different, UE1 The broadcast message transmitted in the PSBCH and the broadcast message transmitted by the UE3 in the PSBCH may also be different. Therefore, the UE3 may update the SLSS of the UE3 according to the SLSS transmitted by the UE1, and/or update the UE3 according to the broadcast message transmitted by the UE1 in the PSBCH. Broadcast messages transmitted in the PSBCH. UE3 may send the updated synchronization subframe signal in the next transmission opportunity. Determining the next transmission opportunity of UE3 can be achieved through the following possible implementations:

A feasible implementation manner: as shown in FIG. 14 , the solid line arrow corresponding to S3, the next transmission opportunity of UE3 is the third SLSS transmission with respect to the first synchronization subframe t1 in the second SLSS transmission period T The first sync subframe t1 in period T.

Another possible implementation manner is as shown by the dotted arrow corresponding to S3 in FIG. 14 or the first synchronization subframe t1 in the second SLSS transmission period T, as shown by the dotted arrow in FIG. The primary transmission opportunity is the second synchronization subframe t2 within the third SLSS transmission period T.

Yet another feasible implementation manner: as shown by the solid arrow in FIG. 19, the next transmission opportunity of UE3 is the second SLSS transmission period T with respect to the first synchronization subframe t1 in the second SLSS transmission period T. The second synchronization sub-frame t2.

Specifically, if the UE3 updates the SLSS of the UE3 according to the SLSS sent by the UE1, and updates the broadcast message transmitted by the UE3 in the PSBCH according to the broadcast message transmitted by the UE1 in the PSBCH, the updated synchronization subframe signal of the UE3 and the UE1 transmit The synchronization subframe signals are the same. Therefore, UE3 and UE1 can transmit the same synchronization subframe signal in the same synchronization subframe, as indicated by the solid arrow corresponding to S3 in FIG. 14, and the next transmission opportunity of UE3 and UE1 are in the third. The synchronization subframes used in the SLSS transmission period T are the same.

If the UE3 updates the SLSS of the UE3 according to the SLSS sent by the UE1, and updates the broadcast message transmitted by the UE3 in the PSBCH according to the broadcast message transmitted by the UE1 in the PSBCH, the updated synchronization subframe signal of the UE3 and the synchronization subframe sent by the UE1 The signals are the same. Therefore, UE3 and UE1 can also transmit the same synchronization subframe signal in different synchronization subframes, such as the dotted arrow corresponding to S3 in FIG. 14, or the next transmission opportunity of UE3 as shown by the dotted arrow in FIG. The synchronization subframe used by UE1 in the third SLSS transmission period T is different.

If the UE3 updates the broadcast message transmitted by the UE3 in the PSBCH according to the broadcast message transmitted by the UE1 in the PSBCH, but does not update the SLSS of the UE3 according to the SLSS sent by the UE1, and the SLSS sent by the UE1 is different from the SLSS of the UE3, the UE3 is updated. The synchronization sub-frame signal is different from the synchronization sub-frame signal sent by the UE1, and the UE3 and the UE1 can transmit different synchronization sub-frame signals in different synchronization sub-frames. One implementation manner is as shown by the dotted arrow corresponding to S3 in FIG. Alternatively, as shown by the dotted arrow in FIG. 19, the next transmission opportunity of UE3 is different from the synchronization subframe used by UE1 in the third SLSS transmission period T. Another achievable manner is as shown by the solid arrow in FIG. 19, the next transmission opportunity of UE3 is the second synchronization subframe t2 in the second SLSS transmission period T, and the UE1 is in the second SLSS transmission period. The synchronization subframe used in T is different.

Optionally, the terminal may further define a detection window [Wmin, Wmax], and the UE randomly selects a detection time in the detection window, where the detection time is used to detect whether the synchronization is sent by another terminal before the terminal sends the synchronization subframe signal. Subframe signal.

In this embodiment, the synchronization subframe is discarded by the terminal, and the synchronization subframe signal sent by other terminals is received while the synchronization subframe is discarded, and the synchronization subframe signal sent by other terminals is detected, and the terminal is on the discarded synchronization subframe. The synchronization subframe signals that are not transmitted are consistent, and the next transmission opportunity is adjusted according to the detection result, so that different synchronization subframe signals are transmitted in the same synchronization subframe as other terminals in the next transmission opportunity, thereby further avoiding synchronization subframe collision.

FIG. 20 is a schematic structural diagram of a communication device according to an embodiment of the present application. As shown in FIG. 20, the communication device may be a terminal, and the communication device includes a processing unit 21, a receiving unit 22, and a transmitting unit 23; wherein the processing unit 21 is configured to determine a target subframe in the synchronization subframe, and use the synchronization subframe The first synchronization subframe signal is sent by the processing unit 21, and the first synchronization subframe signal is not sent by the sending unit 23; the receiving unit 22 is configured to receive the second synchronization subframe sent by the other communication device in the target subframe. signal.

A feasible implementation manner of the processing unit 21 determining the target subframe in the synchronization subframe is: the processing unit 21 The synchronization subframe is periodically or randomly discarded, and the synchronization subframe discarded by the processing unit 21 is the target subframe.

In the above embodiment, when the processing unit 21 periodically discards the synchronization subframe, it is specifically used to: discard k synchronization subframes every N cycles, 0≤k≤N, and the period is the transmission period of the synchronization subframe signal. Synchronization subframes are included in the period. Alternatively, N and k are determined based on priority information of the communication device.

In the above embodiment, before the processing unit 21 determines the target subframe in the synchronization subframe, the receiving unit 22 is further configured to receive configuration information sent by the base station, where the configuration information includes at least one of N, k, and priority information of the communication device. .

In the above embodiment, the communication device further includes: a storage unit 24, configured to pre-store at least one of N, k, and priority information of the communication device.

When the processing unit 21 randomly discards the synchronization subframe, it is specifically used to: discard the synchronization subframe according to the preset probability, and the probability indicates that the processing unit 21 does not transmit the first synchronization subframe signal in the synchronization subframe. Optionally, the preset probability is determined according to priority information of the communication device.

In the above embodiment, before the processing unit 21 determines the target subframe in the synchronization subframe, the receiving unit 22 is further configured to receive configuration information sent by the base station, where the configuration information includes a mapping between the preset probability and the priority information of the communication device. relationship.

In the above embodiment, the communication device further includes: a storage unit 24, configured to pre-store a mapping relationship between the preset probability and the priority information of the communication device.

Another feasible implementation manner of the processing unit 21 determining the target subframe in the synchronization subframe is: the processing unit 21 discards the designated symbol of the first synchronization subframe signal in the synchronization subframe; the designated symbol in the first synchronization subframe signal Corresponding time period, the designated symbol of the first synchronization subframe signal is not transmitted by the transmitting unit 23, and the designated symbol of the second synchronization subframe signal transmitted by the other communication device in the synchronization subframe is received by the receiving unit 22; if the processing unit 21 is Determining the priority of the second synchronization subframe signal, determining that the priority of the other communication device is higher than the priority of the communication device, and/or, after the broadcast channel information of the other communication device has been updated, determining the synchronization subframe and the distance synchronization subframe A synchronization subframe for one cycle is the target subframe.

In the above embodiment, the designated symbol is the last symbol of the first synchronization subframe signal; when the processing unit 21 discards the designated symbol of the first synchronization subframe signal in the synchronization subframe, specifically, it is used to: periodically or randomly discard the synchronizer The specified symbol of the first sync subframe signal in the frame.

In the above embodiment, the designated symbol includes an information sequence for indicating priority indication information and/or broadcast channel information update indication information.

Further, the designated symbol further includes a reference sequence, the reference sequence being before the information sequence.

Further, the designated symbol further includes a transceiving conversion time. Optionally, the designated symbol includes two transceiving conversion times.

In the above embodiment, the information sequence includes a first sequence and/or a second sequence, the first sequence is for indicating priority indication information, and the second sequence is for indicating broadcast channel information update indication information.

In the above embodiment, the first sequence includes at least one subsequence, and the second sequence includes at least one subsequence; wherein each subsequence includes basic sequence and phase information, and phase information in the first sequence is used to indicate a priority indication Information, phase information in the second sequence is used to indicate broadcast channel information update indication information.

In the foregoing embodiment, after receiving the second synchronization subframe signal sent by the other communication device, the processing unit 21 is further configured to determine the first synchronization subframe signal corresponding to the target subframe and the second If the first sub-frame signal corresponding to the target sub-frame does not match the second synchronization sub-frame signal, the processing unit 21 updates the first synchronization sub-frame signal according to the second synchronization sub-frame signal; the processing unit 21 passes The transmitting unit 23 transmits the updated first sync subframe signal.

In the above embodiment, the first synchronization subframe signal includes a first synchronization signal and first broadcast information, and the second synchronization subframe signal includes a second synchronization signal and second broadcast information.

In the above embodiment, when the processing unit 21 updates the first synchronization subframe signal according to the second synchronization subframe signal, it is specifically used for at least one of: updating the first broadcast information according to the second broadcast information; updating according to the second synchronization signal. First sync signal.

In the above embodiment, the sending unit 23 is specifically configured to send the updated first synchronization subframe signal by using the synchronization subframe in the next cycle of the period in which the target subframe is located.

In the above embodiment, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device is the same as the synchronization subframe corresponding to the other communication device. Alternatively, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device is different from the synchronization subframe corresponding to the other communication device.

In the above embodiment, the sending unit 23 is specifically configured to send the updated first synchronization subframe signal by using the next synchronization subframe of the target subframe in the period in which the target subframe is located.

In the above embodiment, the processing unit 21 updates the first broadcast information according to the second broadcast information, and updates the first synchronization signal according to the second synchronization signal.

In the above embodiment, the processing unit 21 updates the first broadcast information according to the second broadcast information, and the second synchronization signal is different from the first synchronization signal.

The communication device of the embodiment shown in FIG. 20 can be used to perform the technical solution of the foregoing method embodiment, and the implementation principle and the technical effect are similar, and details are not described herein again.

It should be understood that the division of each unit of the above terminal or base station is only a division of a logical function, and the actual implementation may be integrated into one physical entity in whole or in part, or may be physically separated. Moreover, these units may all be implemented in the form of software by means of processing component calls; or may be implemented entirely in hardware; some units may be implemented by software in the form of processing component calls, and some units may be implemented in the form of hardware. For example, the receiving unit may be a separately set processing element, or may be integrated in a chip such as a base station or a terminal, or may be stored in a memory of a base station or a terminal in the form of a program, by a base station or a terminal. A processing component calls and performs the functions of each of the above units. The implementation of other units is similar. In addition, all or part of these units can be integrated or implemented independently. The processing elements described herein can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above units may be completed by an integrated logic circuit of hardware in the processor element or an instruction in a form of software. In addition, the above receiving unit is a unit for controlling reception, and the information transmitted by the base station can be received by a receiving device of the terminal or the base station, such as an antenna and a radio frequency device. The above first sending unit is a unit for controlling transmission, and can transmit information to the terminal through a transmitting device of the base station, such as an antenna and a radio frequency device. The second sending unit is a unit for controlling transmission, and can send information to the core network through an interface between the base station and the core network device.

For example, the above units may be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (digital) Singnal processor (DSP), or one or more Field Programmable Gate Array (FPGA). Another example is when the above When implemented in the form of a processing component scheduler, the processing element can be a general purpose processor, such as a central processing unit (CPU) or other processor that can invoke the program. As another example, these units can be integrated and implemented in the form of a system-on-a-chip (SOC).

FIG. 21 is a schematic structural diagram of another communication device according to an embodiment of the present application. As shown in FIG. 21, the communication device may be a terminal, where the communication device includes a processor 210, a receiver 220, and a transmitter 230. The processor 210 is configured to determine a target subframe in the synchronization subframe, and use the synchronization subframe. After transmitting the first synchronization subframe signal, the processor 210 does not send the first synchronization subframe signal in the target subframe through the transmitter 230; the receiver 220 is configured to receive the second synchronization subframe sent by the other communication device in the target subframe. signal.

One possible implementation manner in which the processor 210 determines the target subframe in the synchronization subframe is that the processor 210 periodically or randomly discards the synchronization subframe, and the synchronization subframe discarded by the processor 210 is the target subframe.

In the above embodiment, when the processor 210 periodically discards the synchronization subframe, it is specifically used to: discard k synchronization subframes every N cycles, 0≤k≤N, and the period is the transmission period of the synchronization subframe signal. Synchronization subframes are included in the period. Alternatively, N and k are determined based on priority information of the communication device.

In the above embodiment, before the processor 210 determines the target subframe in the synchronization subframe, the receiver 220 is further configured to receive configuration information sent by the base station, where the configuration information includes at least one of N, k, and priority information of the communication device. .

In the above embodiment, the communication device further includes: a memory 240, configured to pre-store at least one of N, k, and priority information of the communication device.

When the processor 210 randomly discards the synchronization subframe, the method is specifically configured to: discard the synchronization subframe according to a preset probability, where the probability indicates that the processor 210 does not send the first synchronization subframe signal in the synchronization subframe. Optionally, the preset probability is determined according to priority information of the communication device.

In the above embodiment, before the processor 210 determines the target subframe in the synchronization subframe, the receiver 220 is further configured to receive configuration information sent by the base station, where the configuration information includes a mapping between the preset probability and the priority information of the communication device. relationship.

In the above embodiment, the communication device further includes: a memory 240, configured to pre-store a mapping relationship between the preset probability and the priority information of the communication device.

Another possible implementation manner in which the processor 210 determines a target subframe in the synchronization subframe is that the processor 210 discards the designated symbol of the first synchronization subframe signal in the synchronization subframe; the designated symbol in the first synchronization subframe signal Corresponding time period, the specified symbol of the first synchronization subframe signal is not transmitted by the transmitter 230, and the designated symbol of the second synchronization subframe signal sent by the other communication device in the synchronization subframe is received by the receiver 220; Determining the priority of the second synchronization subframe signal, determining that the priority of the other communication device is higher than the priority of the communication device, and/or, after the broadcast channel information of the other communication device has been updated, determining the synchronization subframe and the distance synchronization subframe A synchronization subframe for one cycle is the target subframe.

In the above embodiment, the designated symbol is the last symbol of the first synchronization subframe signal; when the processor 210 discards the designated symbol of the first synchronization subframe signal in the synchronization subframe, specifically used to: periodically or randomly discard the synchronizer The specified symbol of the first sync subframe signal in the frame.

In the above embodiment, the designated symbol includes an information sequence for indicating priority indication information and/or broadcast channel information update indication information.

Further, the designated symbol further includes a reference sequence, the reference sequence being before the information sequence.

Further, the designated symbol further includes a transceiving conversion time. Optionally, the designated symbol includes two transceiving conversion times.

In the above embodiment, the information sequence includes a first sequence and/or a second sequence, the first sequence is for indicating priority indication information, and the second sequence is for indicating broadcast channel information update indication information.

In the above embodiment, the first sequence includes at least one subsequence, and the second sequence includes at least one subsequence; wherein each subsequence includes basic sequence and phase information, and phase information in the first sequence is used to indicate priority indication information The phase information in the second sequence is used to indicate broadcast channel information update indication information.

In the above embodiment, after receiving the second synchronization subframe signal sent by the other communication device, the processor 220 is further configured to determine the first synchronization subframe signal and the second synchronization corresponding to the target subframe. Whether the subframe signal is consistent; if the first synchronization subframe signal and the second synchronization subframe signal corresponding to the target subframe are inconsistent, the processor 210 updates the first synchronization subframe signal according to the second synchronization subframe signal; the processor 210 passes The transmitter 230 transmits the updated first synchronization subframe signal.

In the above embodiment, the first synchronization subframe signal includes a first synchronization signal and first broadcast information, and the second synchronization subframe signal includes a second synchronization signal and second broadcast information.

In the above embodiment, when the processor 210 updates the first synchronization subframe signal according to the second synchronization subframe signal, it is specifically used for at least one of: updating the first broadcast information according to the second broadcast information; updating according to the second synchronization signal. First sync signal.

In the above embodiment, the transmitter 230 is specifically configured to send the updated first synchronization subframe signal by using the synchronization subframe in the next cycle of the period in which the target subframe is located.

In the above embodiment, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device is the same as the synchronization subframe corresponding to the other communication device. Alternatively, in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device is different from the synchronization subframe corresponding to the other communication device.

In the above embodiment, the transmitter 230 is specifically configured to send the updated first synchronization subframe signal by using the next synchronization subframe of the target subframe in the period in which the target subframe is located.

In the above embodiment, the processor 210 updates the first broadcast information according to the second broadcast information, and updates the first synchronization signal according to the second synchronization signal.

In the above embodiment, the processor 210 updates the first broadcast information according to the second broadcast information, and the second synchronization signal is different from the first synchronization signal.

The communication device of the embodiment shown in FIG. 21 can be used to perform the technical solution of the foregoing method embodiment, and the implementation principle and the technical effect are similar, and details are not described herein again.

In FIG. 21, the receiver 220 and the transmitter 230 may be connected to an antenna. In the downlink direction, the receiver 220 receives the information transmitted by the base station through the antenna, and transmits the information to the processor 210 for processing. In the upstream direction, the transmitter 230 processes the data of the communication device and transmits it to the base station via the transmitter 230. The memory 240 is used to store a program for implementing the above method embodiments, or the various units of the embodiment shown in FIG. 20, and the processor 210 calls the program to perform the operations of the above method embodiments to implement the various units shown in FIG.

Alternatively, part or all of the above units may be implemented by being embedded in a chip of the terminal in the form of an integrated circuit. And they can be implemented separately or integrated. That is, the above units may be configured to implement one or more integrated circuits of the above method, for example: one or more specific integrated circuits (Application Specific Integrated Circuit, ASIC), or one or more digital singal processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

Claims (55)

A synchronization method, comprising: Determining, by the first terminal, a target subframe in a synchronization subframe, where the synchronization subframe is used to send a first synchronization subframe signal, and the first terminal does not send the first synchronization subframe signal in the target subframe; The first terminal receives the second synchronization subframe signal sent by the second terminal in the target subframe. The method according to claim 1, wherein the determining, by the first terminal, the target subframe in the synchronization subframe comprises: The first terminal periodically or randomly discards the synchronization subframe, and the synchronization subframe discarded by the first terminal is the target subframe. The method according to claim 2, wherein the first terminal periodically discards the synchronization subframe, including: The first terminal discards k synchronization subframes every N cycles, 0≤k≤N, the period is a transmission period of the synchronization subframe signal, and the synchronization subframe is included in the period. The method of claim 3 wherein N and k are determined based on priority information of said first terminal. The method according to claim 4, wherein before the determining, by the first terminal, the target subframe in the synchronization subframe, the method further includes: The first terminal receives configuration information sent by the base station, where the configuration information includes at least one of N, k, and priority information of the first terminal. The method according to claim 4, wherein the first terminal pre-stores at least one of N, k, and priority information of the first terminal. The method according to claim 2, wherein the first terminal randomly discards the synchronization subframe, including: The first terminal discards the synchronization subframe according to a preset probability, where the probability indicates a probability that the first terminal does not send the first synchronization subframe signal in the synchronization subframe. The method according to claim 7, wherein the preset probability is determined according to priority information of the first terminal. The method according to claim 8, wherein before the determining, by the first terminal, the target subframe in the synchronization subframe, the method further includes: The first terminal receives the configuration information sent by the base station, where the configuration information includes a mapping relationship between the preset probability and the priority information of the first terminal. The method according to claim 8, wherein the first terminal pre-stores a mapping relationship between the preset probability and priority information of the first terminal. The method according to claim 1, wherein the determining, by the first terminal, the target subframe in the synchronization subframe comprises: The first terminal discards a designated symbol of the first synchronization subframe signal in the synchronization subframe; The first terminal does not send the designated symbol of the first synchronization subframe signal in a time period corresponding to the designated symbol of the first synchronization subframe signal, and receives the second terminal sent in the synchronization subframe. Second synchronization The specified symbol of the sub-frame signal; If the first terminal determines, according to the designated symbol of the second synchronization subframe signal, that the priority of the second terminal is higher than the priority of the first terminal, and/or the broadcast of the second terminal The channel information is updated, and the first terminal determines that the synchronization subframe after the synchronization subframe is one cycle from the synchronization subframe is the target subframe. The method according to claim 11, wherein said designated symbol is a last symbol of said first synchronization subframe signal; said first terminal discards said first synchronization subframe in said synchronization subframe The specified symbol of the signal, including: And the first terminal periodically or randomly discards the designated symbol of the first synchronization subframe signal in the synchronization subframe. The method according to claim 11 or 12, wherein the designated symbol comprises a sequence of information for indicating priority indication information and/or broadcast channel information update indication information. The method of claim 13 wherein said designated symbol further comprises a reference sequence preceding said sequence of information. The method of claim 14 wherein said designated symbol further comprises transceiving a conversion time. The method of claim 15 wherein said designated symbol comprises two transceiving conversion times. The method according to any one of claims 13 to 16, wherein the information sequence comprises a first sequence and/or a second sequence, the first sequence being used to represent the priority indication information, The second sequence is used to indicate the broadcast channel information update indication information. The method according to claim 17, wherein said first sequence comprises at least one subsequence and said second sequence comprises at least one subsequence; Wherein each subsequence includes basic sequence and phase information, phase information in the first sequence is used to represent the priority indication information, and phase information in the second sequence is used to indicate the broadcast channel information update indication information. The method according to claim 1 or 11, wherein the first terminal, after receiving the second synchronization subframe signal sent by the second terminal, in the target subframe, further includes: Determining, by the first terminal, whether the first synchronization subframe signal and the second synchronization subframe signal corresponding to the target subframe are consistent; If the first synchronization subframe signal and the second synchronization subframe signal corresponding to the target subframe are inconsistent, the first terminal updates the first synchronization subframe according to the second synchronization subframe signal signal; The first terminal sends the updated first synchronization subframe signal. The method according to claim 19, wherein said first synchronization subframe signal comprises a first synchronization signal and first broadcast information, and said second synchronization subframe signal comprises a second synchronization signal and second broadcast information . The method according to claim 20, wherein the first terminal updates the first synchronization subframe signal according to the second synchronization subframe signal, and includes at least one of the following: The first terminal updates the first broadcast information according to the second broadcast information; The first terminal updates the first synchronization signal according to the second synchronization signal. The method according to claim 21, wherein the transmitting, by the first terminal, the updated first synchronization subframe signal comprises: The first terminal sends the updated first synchronization subframe signal by using a synchronization subframe in a next cycle of the period in which the target subframe is located. The method according to claim 22, wherein in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the first terminal and the synchronization subframe corresponding to the second terminal are the same. The method according to claim 22, wherein in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the first terminal and the synchronization subframe corresponding to the second terminal are different. The method according to claim 21, wherein the transmitting, by the first terminal, the updated first synchronization subframe signal comprises: And transmitting, by the first terminal, the updated first synchronization subframe signal by using a next synchronization subframe of the target subframe in a period in which the target subframe is located. The method according to claim 23 or 24, wherein the first terminal updates the first broadcast information according to the second broadcast information, and updates the first synchronization signal according to the second synchronization signal . The method according to claim 24 or 25, wherein the first terminal updates the first broadcast information according to the second broadcast information, and the second synchronization signal is different from the first synchronization signal . A communication device, comprising: a processor, a receiver, and a transmitter; The processor is configured to determine a target subframe in a synchronization subframe, where the synchronization subframe is used to send a first synchronization subframe signal, and the processor sends the first subframe in the target subframe without using the transmitter a synchronization sub-frame signal; The receiver is configured to receive, according to the target subframe, a second synchronization subframe signal sent by another communication device. The communication device according to claim 28, wherein when the processor determines the target subframe in the synchronization subframe, specifically: The synchronization subframe is periodically or randomly discarded, and the synchronization subframe discarded by the processor is the target subframe. The communication device according to claim 29, wherein when the processor periodically discards the synchronization subframe, the method is specifically configured to: The k synchronization subframes are discarded every N cycles, 0 ≤ k ≤ N, the period is a transmission period of the synchronization subframe signal, and the synchronization subframe is included in the period. The communication device according to claim 30, wherein N and k are determined based on priority information of said communication device. A communication device according to claim 31, wherein Before the processor determines the target subframe in the synchronization subframe, the receiver is further configured to receive configuration information sent by the base station, where the configuration information includes at least one of N, k, and priority information of the communication device. . The communication device of claim 31, further comprising: And a memory for pre-storing at least one of N, k, and priority information of the communication device. A communication device according to claim 29, wherein said processor randomly discards the synchronization When a sub-frame is used, it is specifically used to: The synchronization subframe is discarded according to a preset probability, where the probability indicates a probability that the processor does not transmit the first synchronization subframe signal in the synchronization subframe. The communication device according to claim 34, wherein said preset probability is determined based on priority information of said communication device. A communication device according to claim 35, wherein Before the processor determines the target subframe in the synchronization subframe, the receiver is further configured to receive configuration information sent by the base station, where the configuration information includes the preset probability and the priority information of the communication device. Mapping relationship. The communication device of claim 35, further comprising: And a memory, configured to pre-store a mapping relationship between the preset probability and priority information of the communication device. The communication device according to claim 28, wherein the processor is specifically configured to: when determining the target subframe in the synchronization subframe: And discarding the designated symbol of the first synchronization subframe signal in the synchronization subframe; Receiving, by the transmitter, a designated symbol of the first synchronization subframe signal, and receiving, by the receiver, the other communication device in the time period corresponding to the designated symbol of the first synchronization subframe signal a designated symbol of the second synchronization subframe signal transmitted by the synchronization subframe; If the processor determines, according to the designated symbol of the second synchronization subframe signal, that the priority of the other communication device is higher than a priority of the communication device, and/or the broadcast channel information of the other communication device If it is updated, it is determined that the synchronization subframe after the synchronization subframe is one cycle from the synchronization subframe is the target subframe. The communication device according to claim 38, wherein said designated symbol is a last symbol of said first sync subframe signal; When the processor discards the designated symbol of the first synchronization subframe signal in the synchronization subframe, the processor is specifically configured to: The designated symbol of the first synchronization subframe signal in the synchronization subframe is periodically or randomly discarded. The communication device according to claim 38 or 39, wherein said designated symbol comprises a sequence of information for indicating priority indication information and/or broadcast channel information update indication information. The communication device according to claim 40, wherein said designated symbol further comprises a reference sequence, said reference sequence being preceded by said sequence of information. The communication device according to claim 41, wherein said designated symbol further comprises a transceiving conversion time. The communication device of claim 42, wherein said designated symbol comprises two transceiving conversion times. The communication device according to any one of claims 40 to 43, wherein the information sequence comprises a first sequence and/or a second sequence, the first sequence being used to indicate the priority indication information, The second sequence is used to represent the broadcast channel information update indication information. A communication device according to claim 44, wherein said first sequence comprises at least one a subsequence comprising at least one subsequence; Wherein each subsequence includes basic sequence and phase information, phase information in the first sequence is used to represent the priority indication information, and phase information in the second sequence is used to indicate the broadcast channel information update indication information. A communication device according to claim 28 or 38, characterized in that After the receiver receives the second synchronization subframe signal sent by the other communication device in the target subframe, the processor is further configured to determine the first synchronization subframe signal and the location corresponding to the target subframe. Whether the second synchronization subframe signal is consistent; If the first synchronization subframe signal and the second synchronization subframe signal corresponding to the target subframe do not match, the processor updates the first synchronization subframe signal according to the second synchronization subframe signal ; The processor transmits the updated first synchronization subframe signal through the transmitter. The communication device according to claim 46, wherein said first synchronization subframe signal comprises a first synchronization signal and first broadcast information, and said second synchronization subframe signal comprises a second synchronization signal and a second broadcast information. The communication device according to claim 47, wherein when the processor updates the first synchronization subframe signal according to the second synchronization subframe signal, it is specifically used for at least one of the following: Updating the first broadcast information according to the second broadcast information; Updating the first synchronization signal according to the second synchronization signal. The communication device according to claim 48, wherein the transmitter is specifically configured to send the updated first synchronization subframe by using a synchronization subframe in a next cycle of a period in which the target subframe is located signal. The communication device according to claim 49, wherein in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device and the synchronization subframe corresponding to the other communication device are the same. The communication device according to claim 49, wherein in the next cycle of the period in which the target subframe is located, the synchronization subframe corresponding to the communication device is different from the synchronization subframe corresponding to the other communication device. The communication device according to claim 48, wherein the transmitter is specifically configured to send the updated one by using a next synchronization subframe of the target subframe in a period in which the target subframe is located First sync subframe signal. The communication device according to claim 50 or 51, wherein said processor updates said first broadcast information based on said second broadcast information, and updates said first synchronization signal based on said second synchronization signal . The communication device according to claim 51 or 52, wherein said processor updates said first broadcast information based on said second broadcast information, and said second synchronization signal is different from said first synchronization signal . A computer readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any of claims 1-27.

Images