CN108632178B

CN108632178B - Sending method, receiving method, related equipment and system of synchronous access signal group

Info

Publication number: CN108632178B
Application number: CN201710177631.4A
Authority: CN
Inventors: 李建军
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2017-03-23
Filing date: 2017-03-23
Publication date: 2020-06-12
Anticipated expiration: 2037-03-23
Also published as: CN108632178A; WO2018171469A1

Abstract

The invention provides a sending method, a receiving method, related equipment and a system of a synchronous access signal group, wherein the method comprises the following steps: transmitting the PSS and the SSS at a first time resource and a second time resource, respectively; and sending the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame, and the PBCH signal comprises a system frame number of the frame, so that the transmission of a sequence number of a synchronous access signal group in a downlink channel can be avoided, the overhead of the downlink channel is reduced, and the utilization efficiency of the system is improved.

Description

Sending method, receiving method, related equipment and system of synchronous access signal group

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a sending method, a receiving method, a related device, and a system for a synchronous access signal group.

Background

In a communication system, a user terminal needs to detect a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) to achieve initial time and frequency Synchronization at initial access, and then detect a Physical Broadcast Channel (PBCH) Signal.

At present, in the prior art, a transmission scheme of a synchronization access signal set (SS burst) is adopted, where one synchronization access signal set includes a plurality of synchronization access signal groups (SS blocks), one synchronization access signal group includes PSS, SSs, and PBCH signals, and each synchronization access signal group needs to include a sequence number of the synchronization access signal group in the synchronization access set, and a user terminal implements frame synchronization through the sequence number.

However, the overhead of the downlink channel is increased due to the need to transmit its sequence number in the synchronization access set in the synchronization access signal group.

Disclosure of Invention

The embodiment of the invention provides a sending method, a receiving method, related equipment and a system of a synchronous access signal group, and aims to solve the problem of increased overhead of a downlink channel.

In a first aspect, an embodiment of the present invention provides a method for sending a synchronization access signal group, where the synchronization access signal group includes PSS, SSS, and PBCH signals, and the method includes:

transmitting the PSS and the SSS at a first time resource and a second time resource, respectively;

and sending the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame, and the PBCH signal comprises a system frame number of the frame.

In a second aspect, an embodiment of the present invention further provides a receiving method for a synchronization access signal group, where the synchronization access signal group includes PSS, SSS, and PBCH signals, and the method includes:

searching for the PSS at a first time resource;

performing channel estimation by using the PSS to obtain a channel estimation result;

detecting the SSS at a second time resource using the channel estimation result;

detecting the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame;

and acquiring the system frame number of the frame included in the PBCH signal, and carrying out frame synchronization by using the system frame number.

In a third aspect, an embodiment of the present invention further provides a network side device, configured to send a synchronization access signal group, where the synchronization access signal group includes PSS, SSS, and PBCH signals, and the network side device includes:

a first sending module, configured to send the PSS and the SSS at a first time resource and a second time resource, respectively;

a second sending module, configured to send the PBCH signal at a third time resource, where the first time resource, the second time resource, and the third time resource belong to the same frame, and the PBCH signal includes a system frame number of the frame.

In a fourth aspect, an embodiment of the present invention further provides a user terminal, configured to receive a synchronization access signal group, where the synchronization access signal group includes PSS, SSS, and PBCH signals, and the user terminal includes:

a first search module to search for the PSS at a first time resource;

a channel estimation module, configured to perform channel estimation using the PSS, and obtain a channel estimation result;

a first detecting module, configured to detect the SSS at a second time resource using the channel estimation result;

a second detecting module, configured to detect the PBCH signal at a third time resource, where the first time resource, the second time resource, and the third time resource belong to the same frame;

and the synchronization module is used for acquiring the system frame number of the frame included in the PBCH signal and carrying out frame synchronization by using the system frame number.

In the embodiment of the invention, the PSS and the SSS are respectively sent in the first time resource and the second time resource; and sending the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame, and the PBCH signal comprises a system frame number of the frame, so that the transmission of a sequence number of a synchronous access signal group in a downlink channel can be avoided, the overhead of the downlink channel is reduced, and the utilization efficiency of the system is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a block diagram of a transmission system for synchronizing a set of access signals to which an embodiment of the present invention is applicable;

fig. 2 is a flowchart of a sending method for synchronizing an access signal group according to an embodiment of the present invention;

fig. 3 is a flowchart of another method for transmitting a synchronization access signal group according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating transmission of a synchronization access signal group according to an embodiment of the present invention;

fig. 5 is a schematic diagram of another transmission of a set of synchronization access signals according to an embodiment of the present invention;

fig. 6 is a flowchart of a receiving method for synchronizing an access signal group according to an embodiment of the present invention;

fig. 7 is a flowchart of another method for receiving a synchronization access signal group according to an embodiment of the present invention;

fig. 8 is a structural diagram of a network side device according to an embodiment of the present invention;

fig. 9 is a block diagram of another network-side device provided in the embodiment of the present invention;

fig. 10 is a structural diagram of a user terminal according to an embodiment of the present invention;

fig. 11 is a block diagram of another ue according to an embodiment of the present invention;

fig. 12 is a block diagram of another network-side device according to an embodiment of the present invention;

fig. 13 is a structural diagram of another user terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a structural diagram of a transmission system of a synchronous access signal group, which is applicable to the embodiment of the present invention, and as shown in fig. 1, the transmission system includes a user terminal 11 and a network side device 12, where the user terminal 11 may be a ue (user equipment), for example: the terminal side Device may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), or a Wearable Device (Wearable Device), and it should be noted that the specific type of the user terminal 11 is not limited in the embodiments of the present invention. The ue 11 may establish communication with the network-side device 12, where the network in the figure may indicate that the ue 11 wirelessly establishes communication with the network-side device 12, and the network-side device 12 may be a Transmission Reception Point (TRP) or a base station, and the base station may be a macro station, such as an LTE eNB, a 5G NR NB, or the like. Or the network side device 12 may be an Access Point (AP).

It should be noted that, in the embodiment of the present invention, the specific type of the network-side device 12 is not limited, and the specific functions of the user terminal 11 and the network-side device 12 will be described in detail through a plurality of embodiments below.

Referring to fig. 2, fig. 2 is a flowchart of a sending method for a synchronization access signal group according to an embodiment of the present invention, where the synchronization access signal group includes PSS, SSS, and PBCH signals, and the method may be applied to a network side device, as shown in fig. 2, and includes the following steps:

step 201, at a first time resource and a second time resource, the PSS and the SSS are respectively transmitted.

Step 201 may be to transmit one or more PSS on the first time resource, and if the PSS is transmitted multiple times, the same antenna port may be used each time, and one antenna port may be used for transmission. And one or more SSSs may be transmitted on the second time resource, and if the SSS is transmitted multiple times, the SSS may use the same antenna port each time, and may use one antenna port for transmission. In addition, the antenna port used for transmitting the PSS and the antenna port used for transmitting the SSS may be the same antenna port or different antenna ports.

In addition, the second time resource may be a time resource continuous with the first time resource, but in the embodiment of the present invention, the time sequence relationship between the first time resource and the second time resource is not limited, for example: the first time resource may be located before the second time resource; or the first time resource may be located behind the second time resource, which is not limited in this embodiment of the present invention.

Step 202, sending the PBCH signal in a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same Frame, and the PBCH signal includes a System Frame Number (SFN).

The third time resource may be a time resource continuous with the first time resource, or may be a time resource continuous with the second time resource. And the PBCH signal may be transmitted using two or more antenna ports. The system frame number may be a frame number used to indicate the frame number of the frame in the communication system, i.e. the user terminal may implement frame synchronization through the system frame number.

It should be noted that the PBCH signal includes the system frame number that is the complete system frame number, i.e., the system frame number with the complete data length. For example, in the LTE system, the length of the system frame number is 10 bits, and then the length of the system frame number included in the PBCH signal is also 10 bits.

In the embodiment of the invention, the system frame number sent by the PBCH signal can be obtained through the steps, and the synchronous access signal group is sent in the same frame, so that the frame synchronization can be realized after the user terminal acquires the system frame number in the PBCH signal. And because the synchronous access signal group which does not need to be transmitted has the sequence number in the synchronous access set, the expense of the downlink channel is further reduced.

In the embodiment of the invention, the PSS and the SSS are respectively sent in a first time resource and a second time resource; and sending the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame, and the PBCH signal comprises a system frame number of the frame, so that the transmission of a sequence number of a synchronous access signal group in a downlink channel can be avoided, the overhead of the downlink channel is reduced, and the utilization efficiency of the system is improved.

Referring to fig. 3, fig. 3 is a flowchart of another method for transmitting a synchronization access signal group according to an embodiment of the present invention, where the synchronization access signal group includes a PSS, an SSS, and a PBCH signal, and the method may be applied to a network side device, and in this embodiment, a main difference from the embodiment shown in fig. 3 is that a fourth time resource and a fifth time resource are added on the basis of the embodiment shown in fig. 2, and the PSS and the SSS are transmitted respectively; and a step of sending the PBCH signal in a sixth time resource, so as to improve the performance of receiving the synchronous access signal group by the user terminal. As shown in fig. 3, the method comprises the following steps:

step 301, respectively transmitting the PSS and the SSS at a first time resource and a second time resource.

Step 301 may be to transmit one or more PSS on the first time resource, and if the PSS is transmitted multiple times, the same antenna port may be used each time, and one antenna port may be used for transmission. And one or more SSSs may be transmitted on the second time resource, and if the SSS is transmitted multiple times, the SSS may use the same antenna port each time, and may use one antenna port for transmission.

Step 302, sending the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame, the first time resource, the second time resource and the third time resource belong to a first subframe of the frame, and the PBCH signal includes a system frame number of the frame.

The third time resource may be a time resource continuous with the first time resource, or may be a time resource continuous with the second time resource. And the PBCH signal may be transmitted using two or more antenna ports.

Optionally, the system frame number in the PBCH signal is a complete system frame number.

In this embodiment, the complete system frame number may be a serial number capable of completely representing the frame in the communication system, that is, after the user terminal receives the system frame number, frame synchronization may be implemented without any other information, thereby reducing the overhead of the downlink channel. For example: the system frame number may be 10 bits of information to completely represent the frame number of the frame in 1024 frames in the communication system. Of course, in the embodiment of the present invention, the system frame number may also be a serial number indicating the frame in a specific time period, and after receiving the system frame number, the user terminal performs frame synchronization in combination with the specific time period. It should be noted that this embodiment mode can be applied to the embodiment shown in fig. 2, and the same advantageous effects can be achieved.

Optionally, the PBCH signal includes a main system Information Block (Master Information Block MIB), and the MIB includes the system frame number.

In this embodiment, the MIB may be transmitted in the PBCH signal, and the MIB carries the system frame number. This embodiment can be applied to the example shown in fig. 2. The information field of the MIB may be as shown in table 1:

table 1:

where, MIB information shown in table 1 may be sent from a Frame header in a synchronous access set (SS burst), for example, and the ue may obtain 10-bit information of a current complete Frame Number through a system Frame Number (system Frame Number). Thereby achieving synchronization at the frame level. And the synchronization in the frame is obtained by synchronizing the structures of the PSS, SSS and PBCH signals in the access signal group, so that the user terminal can realize accurate synchronization.

And 303, respectively transmitting the PSS and the SSS in a fourth time resource and a fifth time resource.

In the fourth time resource, the PSS may be transmitted using the same antenna port as the PSS transmitted using the first time resource, or may be transmitted using different antenna ports, and the PSS may be transmitted once or multiple times at the fourth time resource. And when the SSS is transmitted in the fifth time resource, the SSS may be transmitted using the same antenna port using the second time resource, of course, the SSS may be transmitted in a different antenna port, and the SSS may be transmitted once or multiple times in the fifth time resource.

Step 304, sending the PBCH signal in a sixth time resource, wherein the fourth time resource, the fifth time resource and the sixth time resource belong to a second subframe of the frame.

The first subframe and the second subframe may be discontinuous subframes within the same subframe, for example: the first subframe may be a first subframe of a frame and the second subframe may be a time resource in a fifth subframe of the frame, or the first subframe may be a second subframe of the frame and the second subframe may be a time resource in a sixth subframe of the frame, and so on, which is not limited to the embodiment of the present invention. In addition, the antenna port used for transmitting the PBCH signal in the sixth time resource may be the same antenna port as the antenna port used for transmitting the PBCH signal in the third time resource, and of course, a different antenna port may be used.

Optionally, a first subframe of the frame is a 1 st subframe of the frame, and a second subframe of the frame is a 5 th subframe of the frame;

the first time resource includes a last orthogonal frequency division multiplexing, OFDM, symbol of a 1 st slot of a 1 st subframe of the frame, the second time resource includes a second to last OFDM symbol of a 1 st slot of the 1 st subframe of the frame, the third time resource includes first four OFDM symbols of a 2 nd slot of the 1 st subframe of the frame, the fourth time resource includes a last OFDM symbol of a 1 st slot of a 5 th subframe of the frame, the fifth time resource includes a second to last OFDM symbol of a 1 st slot of the 5 th subframe of the frame, and the sixth time resource includes first four OFDM symbols of a second slot of a fifth subframe of the frame.

For example: one synchronization access signal group (SS block) occupies one frame transmission, wherein PSS and SSs are transmitted twice. As shown in fig. 4, the PSS transmits the last OFDM symbol of the first slot of the 1 st subframe in a frame for the first time, and the PSS transmits the last OFDM symbol of the first slot of the 5 th subframe in a frame for the second time. And SSS transmits the second last OFDM symbol of the first slot of the 1 st subframe in a frame, and SSS transmits the second last OFDM symbol of the first slot of the 5 th subframe in a frame. Therefore, the SSS is always transmitted at the former OFDM symbol of the PSS, so that the method is favorable for the user terminal to detect the SSS by using the channel estimation of the PSS, and the detection performance of the SSS is improved. In addition, PBCH information is also transmitted in two times in one SS block, i.e., within one frame. The first four OFDM symbols of the second slot of the 1 st subframe in a frame are transmitted for the first time, and the PSS transmits the first four OFDM symbols of the second slot of the 5 th subframe in a frame for the second time, i.e. PBCH is always transmitted at the four OFDM symbols behind the PSS, so as to improve the detection performance of PBCH signals.

It should be noted that, in this embodiment, the synchronization access signal groups are transmitted in the first subframe and the fifth subframe, so that each transmission of the synchronization access signal groups is uniform, and intervals between different synchronization access signal groups are also uniform, thereby improving the transmission performance of the synchronization access signal groups.

Optionally, the sending the PSS and the SSS at the first time resource and the second time resource, respectively, includes:

transmitting the PSS a plurality of times at a first time resource and the SSS a plurality of times at a second time resource;

the transmitting the PSS and the SSS at a fourth time resource and a fifth time resource, respectively, includes:

transmitting the PSS a plurality of times at a fourth time resource and the SSS a plurality of times at a fifth time resource.

In this embodiment, the PSS may be transmitted multiple times at the first time resource, which may improve the performance of PSS detection. And the transmitting PSS multiple times may be transmitted using the same antenna port. And the SSS can be transmitted for multiple times in the second time resource, so that the SSS detection performance can be improved. And the multiple transmissions SSS may be transmitted using the same antenna port.

In this embodiment, it may also be implemented that the PSS is transmitted multiple times at the fourth time resource, which may further improve the performance of PSS detection. And the SSS can be transmitted for multiple times at the fifth time resource, so that the SSS detection performance can be further improved.

the first time resource includes first, third, fifth and seventh OFDM symbols of a 1 st slot of a 1 st subframe of the frame, the second time resource includes second, fourth and sixth OFDM symbols of the 1 st slot of the 1 st subframe of the frame, the third time resource includes all OFDM symbols of a 2 nd slot of the 1 st subframe of the frame, the fourth time resource includes first, third, fifth and sixth OFDM symbols of a 1 st slot of a 5 th subframe of the frame, the fifth time resource includes second, fourth and sixth OFDM symbols of the 1 st slot of the 5 th subframe of the frame, the sixth time resource includes all OFDM symbols of the 2 nd slot of the 5 th subframe of the frame;

the transmitting the PSS a plurality of times at a first time resource, comprising:

transmitting the PSS at first, third, fifth and seventh OFDM symbols of a 1 st slot of a 1 st subframe of the frame, respectively;

the transmitting the SSS multiple times at the second time resource includes:

transmitting the SSS in second, fourth and sixth OFDM symbols of a 1 st slot of a 1 st subframe of the frame, respectively;

the transmitting the PSS a plurality of times at a fourth time resource, comprising:

transmitting the PSS at first, third, fifth and seventh OFDM symbols of a 1 st slot of a 5 th subframe of the frame, respectively;

the transmitting the SSS a plurality of times at a fifth time resource comprises:

and respectively transmitting the SSS in the second, fourth and sixth OFDM symbols of the 1 st slot of the 5 th subframe of the frame.

For example: one synchronous access signal group (SS block) occupies one frame for transmission, wherein PSS and SSs are transmitted twice, and for each transmission, the PSSs is repeated 4 times and the SSs is repeated 3 times. As shown in fig. 5, the PSS transmits

OFDM symbols

0, 2, 4 and 6 of the first slot of the 1 st subframe in one frame for the first time, and the PSS transmits

OFDM symbols

0, 2, 4 and 6 of the first slot of the 5 th subframe in one frame for the second time. And SSS transmits for the first time the 1, 3, and 5 OFDM symbols in the first slot of the 1 st subframe in a frame, and SSS transmits for the second time the 1, 3, and 5 OFDM symbols in the first slot of the 5 th subframe in a frame. Therefore, both sides of each SSS are provided with the PSS, so that the user terminal can utilize the channel estimation of the PSS to detect the SSS, and the detection performance of the SSS is improved. And PBCH is sent in one SS block in two times, namely within the range of one frame, all OFDM symbols of the second slot of the 1 st subframe in one frame are sent for the first time, and all OFDM symbols of the second slot of the 5 th subframe in one frame are sent for the second time by PSS. The PSS and the SSS occupy one slot for transmission, and the PBCH occupies the slot behind the PSS and the SSS for transmission, so that the detection performance of the PBCH is further improved.

Optionally, the sending the PBCH signal in the third time resource includes:

transmitting the PBCH signal using a plurality of antenna ports at a third time resource;

the transmitting the PBCH signal at the sixth time resource includes:

transmitting the PBCH signal using a plurality of antenna ports at a sixth time resource.

In this embodiment, it may be achieved that the PBCH signal is transmitted using multiple antenna ports in the third time resource and the sixth time resource, so as to improve the detection performance of the PBCH signal.

Optionally, the sending the PBCH signal using multiple antenna ports includes:

and transmitting the PBCH signal by using a plurality of antenna ports in a space-frequency diversity or space-time diversity mode.

The above-mentioned using multiple antenna ports and using space-frequency diversity or space-time diversity to transmit the PBCH signal may be to precode at least two PBCH information symbols transmitted on at least two adjacent subcarriers or at least two OFDM symbols, where the coded symbols are respectively transmitted on multiple antenna ports.

For example: the above-mentioned using multiple antenna ports to transmit the PBCH signal by using space-frequency diversity or space-time diversity includes:

precoding a plurality of PBCH information symbols, and sending a precoding result by using a plurality of antenna ports.

Taking two antenna ports as an example, the ith information symbol x (i) ═ x of the two antenna ports in the PBCH signal⁽⁰⁾(i) x⁽¹⁾(i)]^TInformation symbols y (i) transmitted by space-frequency diversity or space-time diversity [ y ═ y-⁽⁰⁾(i) y⁽¹⁾(i)]^TAnd the precoding operation of the PBCH signal symbols is as follows:

wherein Re represents the real part of the complex number, Im represents the imaginary step of the complex number, and j is the unit of imaginary number.

It should be noted that the precoding method is only an example, and in the embodiment of the present invention, the precoding method of the PBCH signal is not limited.

In the embodiment of the invention, the PBCH signal is sent by utilizing the space-frequency diversity or space-time diversity mode, so that the detection performance of the PBCH can be improved, namely, the PBCH signal is more easily detected by a user terminal.

Referring to fig. 6, fig. 6 is a receiving method of a synchronization access signal group provided in an embodiment of the present invention, where the synchronization access signal group includes PSS, SSS, and PBCH signals, and the method may be applied to a user terminal, as shown in fig. 6, and includes the following steps:

step 601, searching the PSS at the first time resource.

In this step, the user terminal may use one antenna terminal port to search for the PSS on the first time resource, and certainly, may use multiple antenna ports, which is not limited in this embodiment of the present invention.

Step 602, performing channel estimation by using the PSS, and obtaining a channel estimation result.

When the PSS user terminal is detected, channel estimation can be performed to obtain a channel estimation result.

Step 603, detecting the SSS at a second time resource using the channel estimation result.

Since the SSS and the PSS are often transmitted in the same channel, the SSS can be detected using the channel estimation result of the PSS, so as to achieve fast detection of the SSS.

Step 604, detecting the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame.

The PBCH signal may be detected on the third time resource by using the channel estimation result, which is not limited to the following embodiments, for example: the user terminal may also detect the PBCH signal by other methods.

Step 605, acquiring the system frame number of the frame included in the PBCH signal, and performing frame synchronization by using the system frame number.

After the PBCH signal is detected, the system frame number included in the PBCH signal can be acquired. After the system frame number is obtained, frame synchronization can be achieved, namely the user terminal and the network side equipment are in frame synchronization.

In this embodiment, the above steps can avoid transmitting the sequence number of the synchronization access signal group in the downlink channel, thereby reducing the overhead of the downlink channel and improving the utilization efficiency of the system.

Referring to fig. 7, fig. 7 is a diagram of another method for receiving a synchronization access signal group according to an embodiment of the present invention, where the synchronization access signal group includes PSS, SSS, and PBCH signals, and the method may be applied to a user terminal, as shown in fig. 7, and includes the following steps:

step 701, searching the PSS at a first time resource.

And step 702, performing channel estimation by using the PSS to obtain a channel estimation result.

And 703, detecting the SSS at a second time resource by using the channel estimation result.

Step 704, detecting the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame, and the first time resource, the second time resource and the third time resource belong to a first subframe of the frame.

Step 705, searching for the PSS at a fourth time resource.

At the fourth time resource, the user terminal may search for the PSS using one antenna port, and may be the same or a different antenna port than that used at the first time resource. By searching the PSS again, it is possible to achieve an improvement in the detection performance of the PSS.

Step 706, performing channel estimation using the PSS searched for in the fourth time resource, and detecting the SSS in the fifth time resource using a channel estimation result of the channel estimation.

In the fifth time resource, the user terminal may use one antenna port for detection, and may be the same antenna port or a different antenna port than that used in the second time resource. By detecting the SSS again, improved detection performance of the SSS may be achieved.

Step 707, detecting the PBCH signal in a sixth time resource, wherein the fourth time resource, the fifth time resource and the sixth time resource belong to a second subframe of the frame.

By detecting the PBCH signal again in the sixth time resource, the detection performance of PBCH can be improved.

Step 708, acquiring the system frame number of the frame included in the PBCH signal, and performing frame synchronization using the system frame number.

The system frame number obtained in step 708 may be the system frame number detected in the PBCH signal in step 703, or the system frame number detected in the PBCH signal in step 707. And if a PBCH signal is detected in step 703, frame synchronization is completed using the system frame number in the PBCH signal, so that step 708 may not be performed subsequently. After the system frame number is obtained, frame synchronization can be achieved, namely the user terminal and the network side equipment are in frame synchronization.

For the description of the system frame number, reference may be made to the embodiment shown in fig. 3, which is not described herein again, and the same beneficial efficiency may be achieved, and the method may be applied to the embodiment shown in fig. 6.

Optionally, the acquiring the system frame number included in the PBCH signal includes:

and acquiring the MIB included in the PBCH signal, and acquiring the system frame number from the MIB.

For the description of the MIB, refer to the embodiment shown in fig. 3, which is not described herein again, and can achieve the same beneficial efficiency, and can be applied to the embodiment shown in fig. 6.

For the description of the first subframe and the second subframe, reference may be made to the embodiment shown in fig. 3, which is not described herein again, and the same beneficial efficiency may be achieved.

Optionally, the searching for the PSS at the first time resource includes:

searching the PSS a plurality of times at a first time resource;

the detecting the SSS at a second time resource using the channel estimation result includes:

detecting the SSS a plurality of times at a second time resource using the channel estimation result;

the searching for the PSS at the fourth time resource comprises:

searching the PSS for a plurality of times at a fourth time resource;

the performing channel estimation using the PSS searched for at the fourth time resource and detecting the SSS at the fifth time resource using a channel estimation result of the channel estimation includes:

and performing channel estimation by using the PSS searched in the fourth time resource, and detecting the SSS for multiple times in a fifth time resource by using a channel estimation result of the channel estimation.

In this embodiment, the PSS may be searched for multiple times at the first time resource to improve the detection performance of the PSS, and multiple searches may be performed using the same antenna port. And the SSS can be detected for multiple times at the second time resource so as to improve the detection performance of the SSS, and the same antenna port can be used for multiple detections. And the detection performance of the PSS can be improved, and the same antenna port can be used for multiple searches. And the detection performance of the SSS can be improved, and the same antenna port can be used for multiple detections.

the searching for the PSS a plurality of times at the first time resource comprises:

searching for the PSS at first, third, fifth and seventh OFDM symbols of a 1 st slot of a 1 st subframe of the frame, respectively;

the detecting the SSS a plurality of times at a second time resource using the channel estimation result includes:

detecting the SSS in second, fourth and sixth OFDM symbols of a 1 st slot of a 1 st subframe of the frame, respectively, using the channel estimation result;

the searching for the PSS at the fourth time resource comprises:

searching for the PSS at first, third, fifth and seventh OFDM symbols of a 1 st slot of a 5 th subframe of the frame, respectively;

the performing channel estimation using the PSS searched for in the fourth time resource and detecting the SSS a plurality of times in a fifth time resource using a result of the channel estimation includes:

and performing channel estimation by using the PSS searched for in the first, third, fifth and seventh OFDM symbols of the 1 st slot of the 5 th subframe, and detecting the SSS in the second, fourth and sixth OFDM symbols of the 1 st slot of the 5 th subframe of the frame by using the channel estimation result of the channel estimation.

Optionally, the detecting the PBCH signal in the third time resource includes:

detecting the PBCH signal using a plurality of antenna ports at a third time resource;

the detecting the PBCH signal at the sixth time resource includes:

detecting the PBCH signal using a plurality of antenna ports at a sixth time resource.

In this embodiment, it may be achieved that the PBCH signal is detected by using a plurality of antenna ports in the third time resource and the sixth time resource, respectively, so as to improve the detection performance of the PBCH signal.

Optionally, the detecting the PBCH signal by using multiple antenna ports includes:

and detecting the PBCH signal by using a plurality of antenna ports in a space-frequency diversity or space-time diversity mode.

For the space-frequency diversity or space-time diversity, reference may be made to corresponding descriptions in the embodiment shown in fig. 3, which are not described herein again, and the same beneficial effects may be achieved.

It should be noted that, this embodiment is used as an implementation of the user terminal corresponding to the embodiment shown in fig. 3, and specific implementation thereof may refer to the description related to the embodiment shown in fig. 3 to achieve the same beneficial effects, and details are not repeated here to avoid repeated description.

Referring to fig. 8, fig. 8 is a structural diagram of a network side device according to an embodiment of the present invention, which can implement details of a sending method of a synchronization access signal group in the embodiments shown in fig. 2 and fig. 3, and achieve the same effect. The network side equipment is used for sending a synchronization access signal group, wherein the synchronization access signal group comprises PSS, SSS and PBCH signals. As shown in fig. 8, the network-side device 800 includes: a first sending module 801 and a second sending module 802, wherein:

a first sending module 801, configured to send the PSS and the SSS at a first time resource and a second time resource, respectively;

a second sending module 802, configured to send the PBCH signal in a third time resource, where the first time resource, the second time resource, and the third time resource belong to the same frame, and the PBCH signal includes a system frame number of the frame.

Optionally, the PBCH signal includes a main system information block MIB, where the MIB includes the system frame number.

Optionally, the first time resource, the second time resource and the third time resource belong to a first subframe of the frame;

as shown in fig. 9, the network-side device 800 further includes:

a third sending module 803, configured to send the PSS and the SSS at a fourth time resource and a fifth time resource, respectively;

a fourth sending module 804, configured to send the PBCH signal in a sixth time resource, where the fourth time resource, the fifth time resource, and the sixth time resource belong to a second subframe of the frame.

Optionally, the first sending module 801 is specifically configured to send the PSS multiple times at a first time resource and send the SSS multiple times at a second time resource;

the third sending module 803 is specifically configured to send the PSS multiple times at a fourth time resource and send the SSS multiple times at a fifth time resource.

the first sending module 801 is specifically configured to send the PSS in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 1 st subframe of the frame, respectively;

the third sending module 803 is specifically configured to send the PSS in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 5 th subframe of the frame, respectively;

Optionally, the second sending module 802 is specifically configured to send the PBCH signal using multiple antenna ports in a third time resource;

the fourth sending module 804 is specifically configured to send the PBCH signal using multiple antenna ports in a sixth time resource.

Optionally, the second sending module 802 is specifically configured to send the PBCH signal by using multiple antenna ports and using a space-frequency diversity or space-time diversity mode in a third time resource;

the fourth sending module 804 is specifically configured to send the PBCH signal by using multiple antenna ports in a sixth time resource and using a space-frequency diversity or space-time diversity manner.

Optionally, the second sending module 802 is specifically configured to precode a plurality of PBCH information symbols at a third time resource, and send a precoding result by using a plurality of antenna ports;

the fourth sending module 804 is specifically configured to precode the multiple PBCH information symbols at the sixth time resource, and send the precoding result by using the multiple antenna ports.

It should be noted that, in this embodiment, the network-side device 800 may be a network-side device according to any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device 800 in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

Referring to fig. 10, fig. 10 is a structural diagram of a user equipment according to an embodiment of the present invention, which can implement details of the receiving method of the synchronized access signal group in the embodiments shown in fig. 6 and fig. 7, and achieve the same effect. The user terminal is configured to receive a synchronized set of access signals comprising PSS, SSS and PBCH signals. As shown in fig. 10, the user terminal 1000 includes: a first searching module 1001, a channel estimation module 1002, a first detection module 1003, a second detection module 1004, and a synchronization module 1005, wherein:

a first search module 1001 for source searching the PSS at a first time;

a channel estimation module 1002, configured to perform channel estimation using the PSS, and obtain a channel estimation result;

a first detecting module 1003, configured to detect the SSS at a second time resource using the channel estimation result;

a second detecting module 1004, configured to detect the PBCH signal at a third time resource, where the first time resource, the second time resource, and the third time resource belong to the same frame;

a synchronization module 1005, configured to acquire the system frame number of the frame included in the PBCH signal, and perform frame synchronization by using the system frame number.

Optionally, the PBCH signal includes a main system information block MIB, where the MIB includes the system frame number, and the synchronization module 1005 is specifically configured to acquire the MIB included in the PBCH signal, acquire the system frame number from the MIB, and perform frame synchronization using the system frame number.

Optionally, the first time resource, the second time resource and the third time resource belong to a first subframe of the frame; as shown in fig. 11, the user terminal 1000 further includes:

a second searching module 1006, configured to search for the PSS at a fourth time resource;

a third detecting module 1007, configured to perform channel estimation using the PSS searched for the fourth time resource, and detect the SSS at a fifth time resource using a channel estimation result of the channel estimation;

a fourth detecting module 1008, configured to detect the PBCH signal at a sixth time resource, where the fourth time resource, the fifth time resource, and the sixth time resource belong to a second subframe of the frame.

Optionally, the first searching module 1001 is specifically configured to search the PSS multiple times at a first time resource;

the first detecting module 1003 is specifically configured to detect the SSS multiple times at a second time resource by using the channel estimation result;

the second detecting module 1004 is specifically configured to detect the PBCH signal using multiple antenna ports at a third time resource;

the second searching module 1006 is specifically configured to search the PSS multiple times at a fourth time resource;

the third detecting module 1007 is specifically configured to perform channel estimation by using the PSS searched for in the fourth time resource, and detect the SSS multiple times in a fifth time resource by using a channel estimation result of the channel estimation;

the fourth detecting module 1009 is specifically configured to detect the PBCH signal by using multiple antenna ports in a sixth time resource.

the first searching module 1001 is specifically configured to search the PSS in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 1 st subframe of the frame, respectively;

the first detecting module 1003 is specifically configured to use the channel estimation result to detect the SSS in the second, fourth, and sixth OFDM symbols of the 1 st slot of the 1 st subframe of the frame, respectively;

the second searching module 1006 is specifically configured to search the PSS in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 5 th subframe of the frame, respectively;

the third detecting module 1007 is specifically configured to perform channel estimation using the PSS searched for in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 5 th subframe, and detect the SSS in the second, fourth, and sixth OFDM symbols of the 1 st slot of the 5 th subframe of the frame, respectively, using the channel estimation result of the channel estimation.

Optionally, the second detecting module 1004 is specifically configured to detect the PBCH signal by using multiple antenna ports in a third time resource;

the fourth detecting module 1008 is specifically configured to detect the PBCH signal using multiple antenna ports at a sixth time resource.

Optionally, the second detecting module 1004 is specifically configured to detect, in a third time resource, the PBCH signal by using multiple antenna ports in a space-frequency diversity or space-time diversity manner;

the fourth detecting module 1008 is specifically configured to detect the PBCH signal in a space-frequency diversity or space-time diversity manner by using multiple antenna ports in a sixth time resource.

It should be noted that, in this embodiment, the user terminal 1000 may be a user terminal of any implementation manner in the method embodiment of the present invention, and any implementation manner of the user terminal in the method embodiment of the present invention may be implemented by the user terminal 1000 in this embodiment, and the same beneficial effects are achieved, and details are not described here.

Eighth embodiment

Referring to fig. 12, fig. 12 is a structural diagram of a network side device to which an embodiment of the present invention is applied, which can implement details of a transmission method of a synchronous access signal group in the embodiments shown in fig. 2 and fig. 3, and achieve the same effect, where the synchronous access signal group includes PSS, SSS, and PBCH signals. As shown in fig. 12, the network-side device 1200 includes: a processor 1201, a transceiver 1202, a memory 1203, a user interface 1204 and a bus interface, wherein:

the processor 1201 is used for reading the program in the memory 1203 and executing the following processes:

Among other things, the transceiver 1202 is configured to receive and transmit data under control of the processor 1201.

In fig. 12, the bus architecture may include any number of interconnected buses and bridges, with various circuits linking one or more processors, represented by the processor 1201, and memory, represented by the memory 1203. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1202 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 1204 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1201 is responsible for managing a bus architecture and general processing, and the memory 1203 may store data used by the processor 1201 in performing operations.

Optionally, the first time resource, the second time resource and the third time resource belong to a first subframe of the frame; the processor 1201 is further configured to:

transmitting the PSS and the SSS at a fourth time resource and a fifth time resource, respectively;

transmitting the PBCH signal at a sixth time resource, wherein the fourth time resource, the fifth time resource and the sixth time resource belong to a second subframe of the frame.

Optionally, the sending, by the processor 1201, the PSS and the SSS at the first time resource and the second time resource, respectively, includes:

the sending, by processor 1201, the PSS and the SSS at the fourth time resource and the fifth time resource, respectively, includes:

the transmitting the PSS multiple times at the first time resource performed by processor 1201 includes:

the transmitting the SSS multiple times at the second time resource performed by processor 1201 includes:

the transmitting the PSS multiple times at the fourth time resource performed by processor 1201 includes:

the transmitting the SSS multiple times at a fifth time resource performed by processor 1201, comprising:

Optionally, the sending the PBCH signal at the third time resource performed by the processor 1201 includes:

the sending of the PBCH signal at the sixth time resource performed by processor 1201 includes:

Optionally, the sending the PBCH signal by using multiple antenna ports performed by the processor 1201 includes:

Optionally, the sending the PBCH signal by using multiple antenna ports and using a space-frequency diversity or space-time diversity performed by the processor 1201 includes:

It should be noted that, in this embodiment, the network-side device 1200 may be a network-side device according to any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device 1200 in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

Ninth embodiment

Referring to fig. 13, fig. 13 is a structural diagram of a user terminal applied in the embodiment of the present invention, which can implement details of the receiving method of the synchronization signal group in the embodiments shown in fig. 6 and fig. 7, and achieve the same effect, where the synchronization access signal group includes PSS, SSS, and PBCH signals. As shown in fig. 13, the user terminal 1300 includes: at least one processor 1301, memory 1302, at least one network interface 1304, and a user interface 1303. The various components in terminal 1300 are coupled together by a bus system 1305. It is understood that the bus system 1305 is used to implement connective communication between these components. The bus system 1305 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled in FIG. 13 as the bus system 1305.

The user interface 1303 may include, among other things, a display, a keyboard or a pointing device (e.g., a mouse, track ball, touch pad or touch screen, etc.).

It is to be understood that the memory 1302 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double data rate Synchronous Dynamic random access memory (ddr DRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 1302 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 1302 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 13021 and application programs 13022.

The operating system 13021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application programs 13022 include various application programs such as a Media Player (Media Player), a Browser (Browser), etc. for implementing various application services. A program for implementing the method of an embodiment of the present invention may be included in the application 13022.

In the embodiment of the present invention, the processor 1301 is configured to, by calling a program or an instruction stored in the memory 1302, specifically, a program or an instruction stored in the application 13022:

searching for the PSS at a first time resource;

The method disclosed by the above embodiment of the present invention may be applied to the processor 1301, or implemented by the processor 1301. Processor 1301 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1301. The Processor 1301 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable Gate Array (FPGA) or other programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1302, and the processor 1301 reads information in the memory 1302, and completes the steps of the method in combination with hardware thereof.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

Optionally, the acquiring, performed by the processor 1301, the system frame number included in the PBCH signal includes:

before the step of obtaining the system frame number of the frame included in the PBCH signal and using the system frame number for frame synchronization performed by processor 1301, the method further includes:

searching for the PSS at a fourth time resource;

performing channel estimation by using the PSS searched at a fourth time resource, and detecting the SSS at a fifth time resource by using a channel estimation result of the channel estimation;

detecting the PBCH signal at a sixth time resource, wherein the fourth time resource, the fifth time resource and the sixth time resource belong to a second subframe of the frame.

Optionally, the searching for the PSS at the first time resource performed by the processor 1301 includes:

searching the PSS a plurality of times at a first time resource;

the detecting the SSS at a second time resource using the channel estimation result performed by processor 1301 includes:

the searching for the PSS at the fourth time resource performed by processor 1301 comprises:

searching the PSS for a plurality of times at a fourth time resource;

the performing, by processor 1301, channel estimation using the PSS searched for in the fourth time resource, and detecting the SSS in the fifth time resource using a channel estimation result of the channel estimation includes:

the multiple searches of the PSS at the first time resource performed by processor 1301 include:

the detecting the SSS at a second time resource a plurality of times using the channel estimation result performed by processor 1301 includes:

the performing, by processor 1301, channel estimation using the PSS searched for in the fourth time resource, and detecting the SSS multiple times in a fifth time resource using a channel estimation result of the channel estimation includes:

Optionally, the detecting the PBCH signal at the third time resource by the processor 1301 includes:

the detecting the PBCH signal at the sixth time resource performed by processor 1301 includes:

Optionally, the detecting the PBCH signal by using multiple antenna ports performed by the processor 1301 includes:

It should be noted that, in this embodiment, the user terminal 1300 may be a user terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the user terminal in the method embodiment of the present invention may be implemented by the user terminal 1300 in this embodiment, and the same beneficial effects are achieved, and details are not described here.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting a set of synchronization access signals, wherein the set of synchronization access signals comprises Primary Synchronization Signals (PSS), Secondary Synchronization Signals (SSS) and Physical Broadcast Channel (PBCH) signals, the method comprising:

transmitting the PBCH signal at a third time resource, wherein the first time resource, the second time resource and the third time resource belong to the same frame, and the PBCH signal comprises a system frame number of the frame;

wherein the first time resource, the second time resource, and the third time resource are attributed to a first subframe of the frame;

the method further comprises the following steps:

transmitting the PBCH signal at a sixth time resource, wherein the fourth time resource, the fifth time resource and the sixth time resource belong to a second subframe of the frame;

wherein the transmitting the PBCH signal at the third time resource includes:

in a third time resource, a plurality of antenna ports are used, and the PBCH signal is sent by utilizing a space-frequency diversity or space-time diversity mode;

the transmitting the PBCH signal at the sixth time resource includes:

and in a sixth time resource, transmitting the PBCH signal by using a plurality of antenna ports in a space-frequency diversity or space-time diversity mode.

2. The method of claim 1, wherein said PBCH signal comprises a main system information block (MIB), said MIB comprising said system frame number.

3. The method of claim 1 or 2, wherein the system frame number is a full system frame number.

4. The method of claim 1, wherein a first subframe of the frame is a 1 st subframe of the frame, and a second subframe of the frame is a 5 th subframe of the frame;

5. The method of claim 1, wherein the transmitting the PSS and the SSS at first and second time resources, respectively, comprises:

6. The method of claim 5, wherein a first subframe of the frame is a 1 st subframe of the frame, and a second subframe of the frame is a 5 th subframe of the frame;

the transmitting the SSS multiple times at the second time resource includes:

7. The method of claim 1, wherein the transmitting the PBCH signal using the plurality of antenna ports using space-frequency diversity or space-time diversity comprises:

8. A method for receiving a set of synchronization access signals, wherein the set of synchronization access signals includes primary synchronization signals PSS, secondary synchronization signals SSS, and physical broadcast channel PBCH signals, the method comprising:

searching for the PSS at a first time resource;

acquiring the system frame number of the frame included in the PBCH signal, and carrying out frame synchronization by using the system frame number;

before the step of obtaining the system frame number of the frame included in the PBCH signal and using the system frame number for frame synchronization, the method further includes:

searching for the PSS at a fourth time resource;

detecting the PBCH signal at a sixth time resource, wherein the fourth time resource, the fifth time resource and the sixth time resource belong to a second subframe of the frame;

the detecting the PBCH signal at the third time resource includes:

detecting the PBCH signal by using a plurality of antenna ports in a third time resource in a space-frequency diversity or space-time diversity mode;

the detecting the PBCH signal at the sixth time resource includes:

and in a sixth time resource, detecting the PBCH signal by using a plurality of antenna ports in a space-frequency diversity or space-time diversity mode.

9. The method of claim 8, said PBCH signal including a main system information block, MIB, including said system frame number, said obtaining said PBCH signal including a system frame number comprising:

10. The method of claim 8 or 9, wherein the system frame number is a full system frame number.

11. The method of claim 8, wherein a first subframe of the frame is a 1 st subframe of the frame, and a second subframe of the frame is a 5 th subframe of the frame;

12. The method of claim 11, wherein the searching for the PSS at the first time resource comprises:

searching the PSS a plurality of times at a first time resource;

the searching for the PSS at the fourth time resource comprises:

searching the PSS for a plurality of times at a fourth time resource;

13. The method of claim 12, wherein a first subframe of the frame is a 1 st subframe of the frame, and a second subframe of the frame is a 5 th subframe of the frame;

the searching for the PSS at the fourth time resource comprises:

14. A network side device, configured to synchronize transmissions of access signal groups, wherein the synchronization access signal groups include primary synchronization signals PSS, secondary synchronization signals SSS, and physical broadcast channel PBCH signals, and the network side device includes:

a second sending module, configured to send the PBCH signal at a third time resource, where the first time resource, the second time resource, and the third time resource belong to the same frame, and the PBCH signal includes a system frame number of the frame;

the network side device further includes:

a third sending module, configured to send the PSS and the SSS at a fourth time resource and a fifth time resource, respectively;

a fourth sending module, configured to send the PBCH signal in a sixth time resource, where the fourth time resource, the fifth time resource, and the sixth time resource are assigned to a second subframe of the frame;

the second sending module is specifically configured to send the PBCH signal in a space-frequency diversity or space-time diversity manner by using multiple antenna ports in a third time resource;

the fourth sending module is specifically configured to send the PBCH signal in a space-frequency diversity or space-time diversity manner by using multiple antenna ports in a sixth time resource.

15. The network-side device of claim 14, wherein the PBCH signal comprises a main system information block, MIB, comprising the system frame number.

16. The network-side device of claim 14 or 15, wherein the system frame number is a full system frame number.

17. The network-side device of claim 14, wherein a first subframe of the frame is a 1 st subframe of the frame, and a second subframe of the frame is a 5 th subframe of the frame;

18. The network-side device of claim 14, wherein the first transmitting module is specifically configured to transmit the PSS multiple times at a first time resource and transmit the SSS multiple times at a second time resource;

the third sending module is specifically configured to send the PSS multiple times at a fourth time resource and send the SSS multiple times at a fifth time resource.

19. The network-side device of claim 18, wherein a first subframe of the frame is a 1 st subframe of the frame, and a second subframe of the frame is a 5 th subframe of the frame;

the first sending module is specifically configured to send the PSS in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 1 st subframe of the frame, respectively;

the third sending module is specifically configured to send the PSS in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 5 th subframe of the frame, respectively;

20. The network-side device of claim 14, wherein the second sending module is specifically configured to precode a plurality of PBCH information symbols at a third time resource, and send the precoding result using a plurality of antenna ports;

the fourth sending module is specifically configured to precode the multiple PBCH information symbols at a sixth time resource, and send a precoding result using the multiple antenna ports.

21. A user terminal configured to synchronize reception of a set of synchronization access signals, wherein the set of synchronization access signals includes primary synchronization signals PSS, secondary synchronization signals SSS, and physical broadcast channel PBCH signals, the user terminal comprising:

a first search module to search for the PSS at a first time resource;

a synchronization module, configured to acquire a system frame number of the frame included in the PBCH signal, and perform frame synchronization using the system frame number;

the user terminal further comprises:

a second searching module, configured to search for the PSS at a fourth time resource;

a third detecting module, configured to perform channel estimation using the PSS searched for the fourth time resource, and detect the SSS at a fifth time resource using a channel estimation result of the channel estimation;

a fourth detecting module, configured to detect the PBCH signal at a sixth time resource, where the fourth time resource, the fifth time resource, and the sixth time resource are assigned to a second subframe of the frame;

the second detection module is specifically configured to detect, in a third time resource, the PBCH signal in a space-frequency diversity or space-time diversity manner using multiple antenna ports;

the fourth detecting module is specifically configured to detect the PBCH signal in a space-frequency diversity or space-time diversity manner by using multiple antenna ports at a sixth time resource.

22. The user terminal of claim 21, wherein said PBCH signal comprises a main system information block, MIB, comprising said system frame number;

the synchronization module is specifically configured to acquire the MIB included in the PBCH signal, acquire the system frame number from the MIB, and perform frame synchronization using the system frame number.

23. The user terminal of claim 21 or 22, wherein the system frame number in the PBCH signal is a full system frame number.

24. The user terminal of claim 21, wherein the first subframe of the frame is the 1 st subframe of the frame, and the second subframe of the frame is the 5 th subframe of the frame;

25. The user terminal of claim 21, wherein the first search module is specifically configured to search the PSS a plurality of times at a first time resource;

the first detecting module is specifically configured to detect the SSS multiple times at a second time resource using the channel estimation result;

the second searching module is specifically configured to search the PSS multiple times at a fourth time resource;

the third detecting module is specifically configured to perform channel estimation using the PSS searched for in the fourth time resource, and detect the SSS multiple times in a fifth time resource using a channel estimation result of the channel estimation.

26. The user terminal of claim 25, wherein the first subframe of the frame is the 1 st subframe of the frame, and the second subframe of the frame is the 5 th subframe of the frame;

the first searching module is specifically configured to search the PSS in first, third, fifth, and seventh OFDM symbols of a 1 st slot of a 1 st subframe of the frame, respectively;

the first detecting module is specifically configured to detect the SSS in second, fourth, and sixth OFDM symbols of a 1 st slot of a 1 st subframe of the frame, respectively, using the channel estimation result;

the second searching module is specifically configured to search for the PSS in first, third, fifth, and seventh OFDM symbols of a 1 st slot of a 5 th subframe of the frame, respectively;

the third detecting module is specifically configured to perform channel estimation using the PSS searched for in the first, third, fifth, and seventh OFDM symbols of the 1 st slot of the 5 th subframe, and detect the SSS in the second, fourth, and sixth OFDM symbols of the 1 st slot of the 5 th subframe of the frame, respectively, using a channel estimation result of the channel estimation.

27. A transmission system for synchronizing access signal groups, comprising a network side device according to any one of claims 14 to 20 and a user terminal according to any one of claims 21 to 26.