CN109673049B

CN109673049B - PBCH signal transmission method, base station and user terminal

Info

Publication number: CN109673049B
Application number: CN201710953672.8A
Authority: CN
Inventors: 吴凯; 丁昱
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2017-10-13
Filing date: 2017-10-13
Publication date: 2021-08-31
Anticipated expiration: 2037-10-13
Also published as: CN109673049A

Abstract

The embodiment of the invention provides a transmission method of PBCH signals, a base station and a user terminal, wherein the method comprises the following steps: transmitting a PBCH signal to a user terminal on a frequency resource which is not occupied by SSS on an OFDM symbol which is occupied by SSS, wherein the frequency resource which is not occupied by the SSS does not map DMRS of PBCH, or the frequency resource which is not occupied by the SSS maps DMRS sequence initialized by cell ID; transmitting a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS. The embodiment of the invention can improve the transmission performance of PBCH.

Description

PBCH signal transmission method, base station and user terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a base station, and a user terminal for transmitting a Physical Broadcast Channel (PBCH) signal.

Background

A Synchronization Signal block (SS block) in a communication system may include a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSs), and a Physical Broadcast Channel (PBCH) Signal. The SS block is used for acquiring timing by a PSS (power system stabilizer), acquiring a cell ID (identity) by an SSS (secondary synchronization signal) and acquiring partial minimum system information by a PBCH (physical broadcast channel) signal. However, the performance of the SS block may be more demanding in a New Radio (NR) system, and thus how to improve the transmission performance of the PBCH signal is a technical problem which needs to be solved urgently.

Disclosure of Invention

Embodiments of the present invention provide a method, a base station, and a user equipment for transmitting a PBCH signal, so as to solve a problem how to improve transmission performance of the PBCH signal.

In order to solve the technical problem, the invention is realized as follows: a method for transmitting PBCH signals comprises the following steps:

transmitting a PBCH Signal to a user terminal on a Frequency resource not occupied by an Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by SSS, wherein the Frequency resource not occupied by the SSS is not mapped with a Demodulation Reference Signal (DMRS) of PBCH, or the Frequency resource not occupied by the SSS is mapped with a DMRS sequence initialized by a cell ID;

transmitting a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

In a second aspect, an embodiment of the present invention provides a method for transmitting a PBCH signal, including:

receiving a PBCH signal transmitted by a base station on a frequency resource which is not occupied by SSS on an OFDM symbol occupied by the SSS, wherein the frequency resource which is not occupied by the SSS does not map a demodulation reference signal (DMRS) of the PBCH, or the frequency resource which is not occupied by the SSS maps a DMRS sequence initialized by a cell ID;

receiving the base station transmitting PBCH signals on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

In a third aspect, an embodiment of the present invention provides a base station, including:

a first transmission module, configured to transmit a PBCH signal to a user terminal on a frequency resource not occupied by the SSS on an OFDM symbol occupied by the SSS, where the frequency resource not occupied by the SSS does not map a DMRS of a PBCH, or the frequency resource not occupied by the SSS maps a DMRS sequence initialized by a cell ID;

a second transmission module, configured to transmit a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

In a fourth aspect, an embodiment of the present invention provides a user terminal, including:

receiving a PBCH signal transmitted by a base station on a frequency resource not occupied by the SSS on an OFDM symbol occupied by the SSS, wherein the frequency resource not occupied by the SSS does not map a demodulation reference signal, DMRS, of a PBCH, or the frequency resource not occupied by the SSS maps a DMRS sequence initialized by a cell ID;

a second receiving module, configured to receive a PBCH signal transmitted by the base station on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

In a fifth aspect, an embodiment of the present invention provides a base station, including: the invention further provides a base station side PBCH signal transmission method, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps in the PBCH signal transmission method at the base station side when being executed by the processor.

In a sixth aspect, an embodiment of the present invention provides a user terminal, including: the invention further provides a user terminal side PBCH signal transmission method, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps in the PBCH signal transmission method at the user terminal side provided by the embodiment of the invention when being executed by the processor.

In a seventh aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the steps of the method for transmitting a PBCH signal on a base station side provided in the embodiment of the present invention.

In an eighth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the steps of the method for transmitting a PBCH signal on a base station side provided in the embodiment of the present invention.

In the embodiment of the invention, PBCH signals are transmitted to a user terminal by frequency resources which are not occupied by SSS on OFDM symbols which are occupied by the SSS, wherein the frequency resources which are not occupied by the SSS do not map DMRS of PBCH, or the frequency resources which are not occupied by the SSS are mapped with DMRS sequences initialized by cell ID; transmitting a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS. Since the PBCH is transmitted on the OFDM symbol occupied by the SSS, the DMRS of the PBCH can be not mapped, or the DMRS initialized by the cell ID is mapped, more resources can be used for transmitting the PBCH, and the transmission performance of the PBCH 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 structural diagram of a transmission system of a PBCH signal according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a method for transmitting a PBCH signal according to an embodiment of the present invention;

fig. 3 is a schematic diagram of frequency resources occupied by an SSS according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an SS block occupying resource according to an embodiment of the present invention;

fig. 5 is a schematic diagram of another PBCH signal transmission method according to an embodiment of the present invention;

fig. 6 is a schematic diagram of PBCH occupied resources according to an embodiment of the present invention;

fig. 7 is a schematic diagram of another PBCH signal transmission method according to an embodiment of the present invention;

fig. 8 is a structural diagram of a base station according to an embodiment of the present invention;

fig. 9 is a structural diagram of a user equipment according to an embodiment of the present invention;

fig. 10 is a block diagram of another 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 ue according to an embodiment of the present invention;

fig. 13 is a block diagram of another ue according to an embodiment of the present invention;

fig. 14 is a block diagram of another base station provided in an embodiment of the present invention;

fig. 15 is a block diagram of another ue 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 PBCH signal according to an embodiment of the present invention, and as shown in fig. 1, the transmission system includes a user terminal 11 and a base station 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 base station 12 may be a 5G base station (e.g., a gNB or a 5G NRNB), and it should be noted that the specific type of the base station 12 is not limited in the embodiment of the present invention.

It should be noted that the specific functions of the user terminal 11 and the base station 12 are described in detail through a plurality of embodiments below.

Referring to fig. 2, fig. 2 is a schematic diagram of a method for transmitting a PBCH signal according to an embodiment of the present invention, where the method is applied to a base station, and as shown in fig. 2, the method includes the following steps:

step 201, transmitting a PBCH signal to a user terminal on a frequency resource not occupied by the SSS on an OFDM symbol occupied by the SSS, wherein the frequency resource not occupied by the SSS does not map a DMRS of a PBCH, or the frequency resource not occupied by the SSS maps a DMRS sequence initialized by a cell ID.

The OFDM symbol occupied by the SSS may be one OFDM symbol in a time domain resource occupied by the SS block, for example: and the 3 rd OFDM symbol in the time domain resources occupied by the SS block. In addition, in the embodiment of the present invention, the SSS only occupies a part of frequency domain resources in the OFDM symbol, for example: as shown in fig. 3, the SSS occupies 127 consecutive subcarriers, and specifically may occupy only the complete subcarrier resources with the length of 10 PRBs on 1 OFDM symbol, and the SSS is mapped on 3 and 4 subcarriers on the adjacent subcarrier resources on both sides of these subcarriers, respectively.

Since the SSS only occupies a part of the frequency domain resources, PBCH signals may be transmitted to the user terminals over frequency resources not occupied by the SSS. For example: as shown in fig. 4, the PSS is transmitted in the first OFDM symbol, the PBCH signal is transmitted in the 2 nd OFDM symbol, the SSS is transmitted in the 3 rd OFDM symbol, and the PBCH signal is transmitted in the 4 th OFDM symbol for example, wherein the PBCH signal is also transmitted in the 3 rd OFDM symbol.

The DMRSs, to which PBCH is not mapped, in the frequency resources not occupied by the SSS may be understood as that the DMRSs are not transmitted on the frequency-domain resources. The DMRS sequence initialized by the cell ID may be understood as that the cell ID is used for initializing the DMRS sequence, and time information is not used, that is, the DMRS sequence is not related to the time information, or does not carry the time information and is only related to the cell ID.

Step 202, transmitting PBCH signal to the user terminal on at least one OFDM symbol except the OFDM symbol occupied by the SSS.

It should be noted that, in the embodiment of the present invention, the execution sequence of step 201 and step 202 is not limited, for example: step 201 may be performed first, and then step 202 is performed, as shown in fig. 2, or partial operations in step 202 (for example, PBCH signal is transmitted on the 2 nd OFDM symbol) may be performed first, then step 201 is performed to transmit the 3 rd OFDM symbol, and then the remaining operations in step 202 (for example, PBCH signal is transmitted on the 4 th OFDM symbol) are performed, which is not limited in this embodiment of the present invention.

The at least one OFDM symbol may be an OFDM symbol consecutive to an OFDM symbol occupied by the SSS, for example: the SS block occupies 4 consecutive OFDM symbols, then at least one OFDM symbol may be the 2 nd and 4 th OFDM symbols, and the SSs occupies OFDM symbol the 3 rd OFDM symbol.

Through the steps, the DMRS of the PBCH can not be mapped in the frequency resources which are not occupied by the SSS, so that more resources can be used for transmitting the PBCH, and the transmission performance of the PBCH is improved.

In addition, because a DMRS sequence initialized by a cell ID may be mapped to a frequency resource not occupied by the SSS, the user terminal may perform channel estimation using the DMRS sequence received by the frequency resource not occupied by the SSS to obtain a DMRS channel estimation value, and perform channel estimation using the received SSS to obtain a SSS channel estimation value; and using the DMRS channel estimation value and the SSS channel estimation value to carry out coherent detection on the DMRS sequence on the at least one OFDM symbol so as to obtain the time information of the DMRS sequence on the at least one OFDM symbol. Since coherent detection is performed on the DMRS sequence on the at least one OFDM symbol, the detection performance of the carried time information can be improved.

It should be noted that the above method can be applied to a 5G NR system, but is not limited thereto, and for example: but also to future 6G systems, etc.

It should be noted that, since the above method can be applied to NR system, SSS may be referred to as NR SSS, PSS may be referred to as NR PSS, and PBCH may be referred to as NR PBCH.

Referring to fig. 5, fig. 5 is a schematic diagram of another PBCH signal transmission method according to an embodiment of the present invention, where the method is applied to a base station, and as shown in fig. 5, the method includes the following steps:

step 501, transmitting a PBCH signal to a user terminal on a frequency resource not occupied by the SSS on an OFDM symbol occupied by the SSS, wherein the frequency resource not occupied by the SSS does not map a DMRS of a PBCH, or the frequency resource not occupied by the SSS maps a DMRS sequence initialized by a cell ID.

Optionally, the frequency resources not occupied by the SSS include:

a Physical Resource Block (PRB) not occupied by the SSS; and/or

Resource Elements (REs) in PRBs occupied by the SSS that are not occupied by the SSS.

In this embodiment, it may be implemented that PRBs not occupied by SSS are used for PBCH transmission, and if there are unoccupied REs in the PRBs occupied by SSS, the PRBs may also be used for PBCH transmission, so as to improve transmission performance of PBCH. For example: as shown in fig. 3, REs in the left and right PRBs that are not occupied by SSS may be used for PBCH transmission.

Optionally, in this embodiment of the present invention, the RE resources occupied by the PBCH signal may be mapped through a sequence of a first frequency direction and a second time direction.

In this embodiment, the PBCH signal may be mapped to the 2 nd, 3 rd and 4 th OFDM symbols in the order of the frequency direction first and the time direction later, so as to improve the transmission performance of the PBCH signal. Of course, the embodiment of the present invention does not limit this, and in some scenarios, the mapping may be performed first in time and then in frequency.

Optionally, if the frequency resource not occupied by the SSS is mapped with a DMRS sequence, the density of the DMRS sequence mapped to the frequency resource not occupied by the SSS on the PRB is 1/4.

The density of the DMRS sequences on the PRB is 1/4, which means that 1 RE in every 4 REs is occupied by the DMRS sequences, and the remaining 3 REs are occupied by the PBCH. Further, the RE intervals occupied by the DMRS sequences are equal. In this embodiment, since the density of DMRS sequences on a PRB is 1/4, the PBCH mediation performance can be improved. Of course, the embodiment of the present invention is not limited thereto, for example: the density of DMRS sequences on PRBs may be 1/3 or 1/5, etc. in some scenarios.

Optionally, a starting position of the DMRS sequence mapped to the frequency resource not occupied by the SSS is related to the cell ID.

The starting position may be a starting subcarrier number, and the correlation between the starting position and the cell ID may be understood as that the starting position of the DMRS sequence may be determined by the cell ID, so that REs occupied by the DMRS sequence may be reasonably allocated to improve demodulation performance of the DMRS sequence. For example: the starting position of the DMRS sequence mapped to the frequency resource not occupied by the SSS may be mod (cell ID, 4), where mod is a complementation function and the cell ID is a cell ID. When the numbers in 1 PRB start from 0 and are 0,1, …,11, the starting position of the DMRS sequence is mod (Cell ID, 4). In this embodiment, since the starting subcarrier number of the DMRS sequence is mod (cell ID, 4), REs occupied by the DMRS sequence may be reasonably allocated, so as to improve demodulation performance of the DMRS sequence.

Step 502, transmitting PBCH signal to the user terminal on continuous frequency domain resources on at least one OFDM symbol except the OFDM symbol occupied by the SSS.

Step 502 may be understood as the PBCH signal on the at least one OFDM symbol occupying contiguous frequency domain resources. For example: SS Block occupies 20 PRBs, PBCH is transmitted on 20 consecutive PRBs on SS Block 2 nd and 4 th OFDM symbols.

It should be noted that, in this embodiment, step 502 is optional, and may be understood as a limitation to step 202, for example: the PBCH signal on the at least one OFDM symbol occupies non-contiguous frequency domain resources in some scenarios.

Optionally, the DMRS sequence is mapped on the at least one OFDM symbol, a density of the DMRS sequence mapped on the at least one OFDM symbol in a PRB occupied by a PBCH signal is 1/4, and the DMRS sequence mapped on the at least one OFDM symbol is initialized by a cell ID and time information.

In this embodiment, the DMRS sequences mapped by at least one OFDM symbol (e.g., the 2 nd and 4 th OFDM symbols) are initialized by the cell ID and the time information, and the density in the PRB occupied by the PBCH signal is 1/4. For example: as shown in fig. 6, one RE out of every 4 REs is occupied by a DMRS sequence. And because the mapped DMRS sequence is initialized through the cell ID and the time information, the time information can be effectively transmitted to the user terminal, so that the transmission performance of the PBCH is improved.

Further, the DMRS sequence mapped on the at least one OFDM symbol may be initialized by a cell ID and 3-bit time information. When the maximum SS block number L in one synchronization signal set (SS burst set) period (5ms) is 4, the 3-bit time information is SS block time index (SS block time index) of 2 bits and 1-bit half radio frame indication (half radio frame indication) information. If the maximum SS block number L in one synchronization signal set (SS burst set) period (5ms) is greater than 4, the 3-bit time information is the low-order bits of the SS block time index of 3 bits.

Through the steps, the PBCH signals can be transmitted to the user terminal by using the frequency resources which are not occupied by the SSS on the OFDM symbols occupied by the SSS, and the DMRS of the PBCH is not mapped, so that more resources can be used for transmitting the PBCH signals, and the transmission performance of the PBCH signals can be improved. And the user terminal can use the DMRS sequence received on at least one OFDM symbol to carry out channel estimation to obtain a channel estimation value, and use the channel estimation value to demodulate the frequency resource which is not occupied by the SSS. For example: performing channel estimation by using the DMRS sequences received by the 2 nd and 4 th OFDM symbols to obtain a channel estimation value, and demodulating the REs occupied by the PBCH in the 3 rd OFDM symbol, specifically, the RE occupied by the PBCH in the 3 rd OFDM symbol may be demodulated by using a weighted average value of the channel estimation values of the DMRS sequences of the 2 nd and 4 th OFDM symbols, and preferably, the RE occupied by the PBCH in the 3 rd OFDM symbol may be demodulated by using a wiener filter output value of the channel estimation value, so as to improve demodulation performance.

Through the steps, the DMRS sequences initialized by the cell ID can be mapped on the OFDM symbols occupied by the SSS, so that the user terminal can use the DMRS sequences received by the frequency resources not occupied by the SSS to perform channel estimation to obtain DMRS channel estimation values, and use the received SSS to perform channel estimation to obtain SSS channel estimation values; and using the DMRS channel estimation value and the SSS channel estimation value to carry out coherent detection on the DMRS sequence on the at least one OFDM symbol so as to obtain the time information of the DMRS sequence on the at least one OFDM symbol.

The coherent detection of the DMRS sequence on the at least one OFDM symbol using the DMRS channel estimate and the SSS channel estimate may be performed by concatenating the DMRS channel estimate and the SSS channel estimate to obtain a channel estimate with a complete bandwidth, and performing coherent detection of the DMRS sequence on the at least one OFDM symbol using the channel estimate with the complete bandwidth to obtain time information of the DMRS sequence on the at least one OFDM symbol. Because coherent detection is adopted, the detection performance of the carried time information can be improved.

In addition, the user terminal can also perform channel estimation according to the DMRS sequence on the at least one OFDM symbol to obtain a channel estimation value on the at least one OFDM symbol; and using the channel estimation value on the at least one OFDM symbol to demodulate the PBCH signal on the at least one OFDM symbol; and demodulating a PBCH signal on an OFDM symbol occupied by the SSS by using the DMRS channel estimation value.

In this way, the user terminal can obtain the DMRS sequence, for example: and obtaining DMRS sequences on the 2 nd symbol and the 4 th symbol so as to obtain channel estimation values of the 2 nd symbol and the 4 th symbol, further using the corresponding channel estimation values to demodulate, and also using the DMRS channel estimation values on the symbols occupied by the SSS to demodulate PBCH signals on the OFDM symbols occupied by the SSS so as to improve the demodulation performance of the PBCH.

If the frequency resource not occupied by the SSS is mapped with a DMRS sequence, because the DMRS sequence is related to the cell identifier, the user terminal can also use the DMRS sequence received in the frequency resource not occupied by the SSS to perform channel estimation to obtain a DMRS channel estimation value, and use the received SSS to perform channel estimation to obtain a SSS channel estimation value; and performing Radio Resource Management (RRM) measurement using the DMRS channel estimate and the SSS channel estimate.

Specifically, the DMRS channel estimate and the SSS channel estimate may be jointly used to perform RRM measurement for radio resource management, for example: the two channel estimation values are cascaded to obtain channel estimation of the complete bandwidth, and then RRM measurement is carried out by using the channel estimation of the complete bandwidth, so that the RRM measurement effect is improved.

Referring to fig. 7, fig. 7 is a schematic diagram of another PBCH signal transmission method according to an embodiment of the present invention, where the method is applied to a user equipment, as shown in fig. 7, and includes the following steps:

step 701, receiving a PBCH signal transmitted by a base station on a frequency resource not occupied by an SSS on an OFDM symbol occupied by the SSS, wherein the frequency resource not occupied by the SSS does not map a DMRS of a PBCH, or the frequency resource not occupied by the SSS maps a DMRS sequence initialized by a cell ID;

step 702, receiving PBCH signal transmitted by the base station on at least one OFDM symbol except the OFDM symbol occupied by the SSS.

Optionally, the frequency resources not occupied by the SSS include:

PRBs not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

Optionally, after the step of receiving the PBCH signal transmitted by the base station on at least one OFDM symbol other than the OFDM symbol occupied by the SSS, the method further includes:

and performing channel estimation by using the DMRS sequence received on at least one OFDM symbol to obtain a channel estimation value, and demodulating the frequency resources which are not occupied by the SSS by using the channel estimation value.

Optionally, if the frequency resource not occupied by the SSS is mapped with a DMRS sequence, and the at least one OFDM symbol is mapped with a DMRS sequence initialized by a cell ID and time information;

after the step of receiving the base station transmission PBCH signal on at least one OFDM symbol except the OFDM symbol occupied by the SSS, the method further comprises:

performing channel estimation by using the DMRS sequence received in the frequency resource which is not occupied by the SSS to obtain a DMRS channel estimation value, and performing channel estimation by using the received SSS to obtain a SSS channel estimation value;

and using the DMRS channel estimation value and the SSS channel estimation value to carry out coherent detection on the DMRS sequence on the at least one OFDM symbol so as to obtain the time information of the DMRS sequence on the at least one OFDM symbol.

Optionally, after the step of performing coherent detection on the DMRS sequence on the at least one OFDM symbol by using the DMRS channel estimate and the SSS channel estimate to obtain time information of the DMRS sequence on the at least one OFDM symbol, the method further includes:

performing channel estimation according to the DMRS sequence on the at least one OFDM symbol to obtain a channel estimation value on the at least one OFDM symbol;

demodulating a PBCH signal on the at least one OFDM symbol using the channel estimate on the at least one OFDM symbol;

and demodulating a PBCH signal on the OFDM symbol occupied by the SSS by using the DMRS channel estimation value.

Optionally, if the frequency resource not occupied by the SSS is mapped with a DMRS sequence;

and performing Radio Resource Management (RRM) measurement by using the DMRS channel estimation value and the SSS channel estimation value.

Optionally, the OFDM symbol occupied by the SSS is a 3 rd OFDM symbol in a time domain resource occupied by the SS block;

the at least one OFDM symbol is the 2 nd and 4 th OFDM symbols in the time domain resources occupied by the SS block.

It should be noted that, this embodiment is used as an implementation of the user terminal corresponding to the embodiments shown in fig. 2 to fig. 3, and specific implementations thereof may refer to the relevant descriptions of the embodiments shown in fig. 2 to fig. 3 and achieve the same beneficial effects, and are not described herein again to avoid repeated descriptions.

Referring to fig. 8, fig. 8 is a structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 8, a base station 800 includes:

a first transmission module 801, configured to transmit a PBCH signal to a user terminal on a frequency resource not occupied by the SSS on an OFDM symbol occupied by the SSS, where a DMRS of a PBCH is not mapped to the frequency resource not occupied by the SSS, or a DMRS sequence initialized by a cell ID is mapped to the frequency resource not occupied by the SSS;

a second transmitting module 802, configured to transmit a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

Optionally, the frequency resources not occupied by the SSS include:

physical resource blocks, PRBs, not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

Optionally, the OFDM symbol occupied by the SSS is a 3 rd OFDM symbol in a time domain resource occupied by a synchronization signal block SS block;

Optionally, the PBCH signal on the at least one OFDM symbol occupies consecutive frequency domain resources.

The base station provided by the embodiment of the present invention can implement each process implemented by the base station in the method embodiments of fig. 2 to fig. 5, and for avoiding repetition, the description is omitted here, and the overhead of configuring the time domain position of the CSI-RS can be reduced.

Referring to fig. 9, fig. 9 is a structural diagram of a user terminal according to an embodiment of the present invention, and as shown in fig. 9, the user terminal 900 includes:

a first receiving module 901, configured to receive, on an OFDM symbol occupied by SSS, a PBCH signal transmitted by a base station on a frequency resource not occupied by the SSS, where the frequency resource not occupied by the SSS does not map a demodulation reference signal, DMRS, of a PBCH, or the frequency resource not occupied by the SSS maps a DMRS sequence initialized by a cell ID;

a second receiving module 902, configured to receive a PBCH signal transmitted by the base station on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

Optionally, the frequency resources not occupied by the SSS include:

PRBs not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

Optionally, as shown in fig. 10, the user terminal 900 further includes:

a first demodulation module 903, configured to perform channel estimation using a DMRS sequence received on at least one OFDM symbol to obtain a channel estimation value, and demodulate, using the channel estimation value, the frequency resource not occupied by the SSS.

as shown in fig. 11, the user terminal 900 further includes:

a first estimating module 904, configured to perform channel estimation using a DMRS sequence received in the frequency resource not occupied by the SSS to obtain a DMRS channel estimation value, and perform channel estimation using the SSS received to obtain a SSS channel estimation value;

a detecting module 905, configured to perform coherent detection on the DMRS sequence on the at least one OFDM symbol by using the DMRS channel estimation value and the SSS channel estimation value, to obtain time information of the DMRS sequence on the at least one OFDM symbol.

Optionally, as shown in fig. 12, the user terminal 900 further includes:

a second estimating module 906, configured to perform channel estimation according to the DMRS sequence on the at least one OFDM symbol, to obtain a channel estimation value on the at least one OFDM symbol;

a second demodulation module 907, configured to demodulate a PBCH signal on the at least one OFDM symbol using the channel estimation value on the at least one OFDM symbol;

a third demodulation module 908, configured to demodulate a PBCH signal on the OFDM symbol occupied by the SSS using the DMRS channel estimate.

as shown in fig. 13, the user terminal 900 further includes:

a third estimating module 909, configured to perform channel estimation using the DMRS sequence received in the frequency resource not occupied by the SSS to obtain a DMRS channel estimation value, and perform channel estimation using the SSS received to obtain a SSS channel estimation value;

a measuring module 9010, configured to perform RRM measurement on radio resource management using the DMRS channel estimation value and the SSS channel estimation value.

The terminal provided by the embodiment of the present invention can implement each process implemented by the user terminal in the method embodiment of fig. 7, and for avoiding repetition, the process is not described here again, and the overhead of configuring the time domain position of the CSI-RS can be reduced.

Referring to fig. 14, fig. 14 is a structural diagram of another base station provided in the embodiment of the present invention, and as shown in fig. 14, the base station 1400 includes: a processor 1401, a transceiver 1402, a memory 1403, and a bus interface, wherein:

wherein, the transceiver 1402 is configured to transmit a PBCH signal to a user terminal on a frequency resource not occupied by the SSS on an OFDM symbol occupied by the SSS, wherein the frequency resource not occupied by the SSS does not map a DMRS of a PBCH, or the frequency resource not occupied by the SSS maps a DMRS sequence initialized by a cell ID; transmitting a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

Optionally, the frequency resources not occupied by the SSS include:

physical resource blocks, PRBs, not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

Wherein the transceiver 1402 is configured to receive and transmit data under the control of the processor 1401, the transceiver 1402 comprising at least two antenna ports.

In fig. 14, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1401, and various circuits, represented by memory 1403, linked together. 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 1402 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 1404 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1401 is responsible for managing a bus architecture and general processing, and the memory 1403 may store data used by the processor 1401 in performing operations.

Preferably, an embodiment of the present invention further provides a base station, including a processor 1401, a memory 1403, and a computer program stored in the memory 1403 and capable of running on the processor 1401, where the computer program, when executed by the processor 1401, implements each process of the foregoing method for transmitting a PBCH signal, and can achieve the same technical effect, and details are not repeated here to avoid repetition.

Figure 15 is a schematic diagram of a hardware structure of a user terminal implementing various embodiments of the present invention,

the user terminal 1500 includes but is not limited to: a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, a processor 1510, and a power supply 1511. Those skilled in the art will appreciate that the user terminal architecture shown in fig. 15 does not constitute a limitation of the user terminal, and that the user terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the user terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted user terminal, a wearable device, a pedometer, and the like.

A radio frequency unit 1501, configured to receive, on an OFDM symbol occupied by SSS, a PBCH signal transmitted by a base station on a frequency resource not occupied by the SSS, where a demodulation reference signal, DMRS, of a PBCH is not mapped to the frequency resource not occupied by the SSS, or a DMRS sequence initialized by a cell ID is mapped to the frequency resource not occupied by the SSS; and receiving the base station transmission PBCH signal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS.

Optionally, the frequency resources not occupied by the SSS include:

PRBs not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

Optionally, the processor 1510 is configured to perform channel estimation by using a DMRS sequence received on at least one OFDM symbol, to obtain a channel estimation value, and demodulate, by using the channel estimation value, the frequency resource not occupied by the SSS.

Optionally, if the frequency resource not occupied by the SSS is mapped with a DMRS sequence, and the at least one OFDM symbol is mapped with a DMRS sequence initialized by a cell ID and time information; a processor 1510, configured to perform channel estimation using the DMRS sequence received in the frequency resource not occupied by the SSS to obtain a DMRS channel estimation value, and perform channel estimation using the SSS to obtain a SSS channel estimation value; and using the DMRS channel estimation value and the SSS channel estimation value to carry out coherent detection on the DMRS sequence on the at least one OFDM symbol so as to obtain the time information of the DMRS sequence on the at least one OFDM symbol.

Optionally, after the step of performing coherent detection on the DMRS sequence on the at least one OFDM symbol by using the DMRS channel estimate and the SSS channel estimate to obtain time information of the DMRS sequence on the at least one OFDM symbol, the processor 1510 is further configured to:

Optionally, if the frequency resource not occupied by the SSS is mapped with a DMRS sequence; a processor 1510, configured to perform channel estimation using the DMRS sequence received in the frequency resource not occupied by the SSS to obtain a DMRS channel estimation value, and perform channel estimation using the SSS to obtain a SSS channel estimation value; and performing Radio Resource Management (RRM) measurement by using the DMRS channel estimation value and the SSS channel estimation value.

It should be understood that, in the embodiment of the present invention, the rf unit 1501 may be configured to receive and transmit signals during a message transmission or a call, and specifically, receive downlink data from a base station and then process the received downlink data to the processor 1510; in addition, the uplink data is transmitted to the base station. In general, the radio frequency unit 1501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Further, the radio frequency unit 1501 may also communicate with a network and other devices through a wireless communication system.

The user terminal provides wireless broadband internet access to the user through the network module 1502, such as helping the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit 1503 may convert audio data received by the radio frequency unit 1501 or the network module 1502 or stored in the memory 1509 into an audio signal and output as sound. Also, the audio output unit 1503 may also provide audio output related to a specific function performed by the user terminal 1500 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 1503 includes a speaker, a buzzer, a receiver, and the like.

The input unit 1504 is used to receive audio or video signals. The input Unit 1504 may include a Graphics Processing Unit (GPU) 15041 and a microphone 15042, and the Graphics processor 15041 processes image data of a still picture or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 1506. The image frames processed by the graphic processor 15041 may be stored in the memory 1509 (or other storage medium) or transmitted via the radio frequency unit 1501 or the network module 1502. The microphone 15042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 1501 in the case of the phone call mode.

User terminal 1500 also includes at least one sensor 1505, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 15061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 15061 and/or a backlight when the user terminal 1500 moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the user terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; sensors 1505 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 1506 is used to display information input by the user or information provided to the user. The Display unit 1506 may include a Display panel 15061, and the Display panel 15061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 1507 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the user terminal. Specifically, the user input unit 1507 includes a touch panel 15071 and other input devices 15072. The touch panel 15071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 15071 (e.g., operations by a user on or near the touch panel 15071 using a finger, a stylus, or any suitable object or accessory). The touch panel 15071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, and sends the touch point coordinates to the processor 1510 to receive and execute commands sent by the processor 1510. In addition, the touch panel 15071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 15071, the user input unit 1507 may include other input devices 15072. In particular, other input devices 15072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

Further, the touch panel 15071 may be overlaid on the display panel 15061, and when the touch panel 15071 detects a touch operation thereon or nearby, the touch panel 15071 transmits the touch operation to the processor 1510 to determine the type of the touch event, and then the processor 1510 provides a corresponding visual output on the display panel 15061 according to the type of the touch event. Although in fig. 15, the touch panel 15071 and the display panel 15061 are two independent components to implement the input and output functions of the user terminal, in some embodiments, the touch panel 15071 and the display panel 15061 may be integrated to implement the input and output functions of the user terminal, and is not limited herein.

The interface unit 1508 is an interface for connecting external devices to the user terminal 1500. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 1508 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the user terminal 1500 or may be used to transmit data between the user terminal 1500 and the external device.

The memory 1509 may be used to store software programs as well as various data. The memory 1509 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 1509 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 1510 is a control center of the user terminal, connects various parts of the entire user terminal using various interfaces and lines, performs various functions of the user terminal and processes data by running or executing software programs and/or modules stored in the memory 1509 and calling data stored in the memory 1509, thereby performing overall monitoring of the user terminal. Processor 1510 may include one or more processing units; preferably, the processor 1510 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 1510.

The user terminal 1500 may also include a power supply 1511 (such as a battery) for powering the various components, and preferably, the power supply 1511 may be logically coupled to the processor 1510 via a power management system that may enable managing charging, discharging, and power consumption management functions.

In addition, the user terminal 1500 includes some functional modules that are not shown, and are not described herein.

Preferably, an embodiment of the present invention further provides a user terminal, which includes a processor 1510, a memory 1509, and a computer program stored in the memory 1509 and executable on the processor 1510, where the computer program, when executed by the processor 1510, implements each process of the above-mentioned PBCH signal transmission method embodiment, and can achieve the same technical effect, and in order to avoid repetition, it is not described herein again.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the embodiment of the method for transmitting a PBCH signal on a base station side.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the embodiment of the method for transmitting a PBCH signal at a ue.

The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for transmitting a Physical Broadcast Channel (PBCH) signal, comprising:

transmitting a PBCH signal to a user terminal on a frequency resource which is not occupied by a Secondary Synchronization Signal (SSS) on an Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by the SSS, wherein the frequency resource which is not occupied by the SSS is not mapped with a demodulation reference signal (DMRS) of the PBCH, or the frequency resource which is not occupied by the SSS is mapped with a DMRS sequence initialized by a cell ID;

transmitting a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS;

the DMRS sequence mapped on the at least one OFDM symbol has a density of 1/4 in a PRB occupied by a PBCH signal, and is initialized by a cell ID and time information; and/or the OFDM symbol occupied by the SSS is the 3 rd OFDM symbol in the time domain resource occupied by the synchronization signal block SS block; the at least one OFDM symbol is the 2 nd and 4 th OFDM symbols in the time domain resources occupied by the SS block;

the at least one OFDM symbol is different from the OFDM symbol occupied by the primary synchronization signal PSS.

2. The method of claim 1, wherein the frequency resources unoccupied by the SSS comprise:

physical resource blocks, PRBs, not occupied by the SSS; and/or

3. The method of claim 1, wherein a starting position of the DMRS sequence of the frequency resource mapping not occupied by the SSS is related to the cell ID.

4. The method of any one of claims 1 to 3, wherein PBCH signals on the at least one OFDM symbol occupy contiguous frequency domain resources.

5. A method for transmitting a PBCH signal, comprising:

receiving the base station transmitting PBCH signals on at least one OFDM symbol other than the OFDM symbol occupied by the SSS;

6. The method of claim 5, wherein the frequency resources unoccupied by the SSS comprise:

PRBs not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

7. The method of claim 6, wherein after the step of receiving the base station transmitted PBCH signals on at least one OFDM symbol other than the OFDM symbol occupied by the SSS, the method further comprises:

8. The method of claim 5, wherein the DMRS sequence initialized by a cell ID and time information is mapped on the at least one OFDM symbol if the frequency resources not occupied by the SSS are mapped with DMRS sequences;

9. The method of claim 8, wherein after the step of coherently detecting the DMRS sequence on the at least one OFDM symbol using the DMRS channel estimate and the SSS channel estimate to obtain time information for the DMRS sequence on the at least one OFDM symbol, the method further comprises:

10. The method of claim 5, wherein if the frequency resources not occupied by the SSS are mapped with DMRS sequences;

11. A base station, comprising:

a second transmission module, configured to transmit a PBCH signal to the user terminal on at least one OFDM symbol other than the OFDM symbol occupied by the SSS;

12. The base station of claim 11, wherein the frequency resources unoccupied by the SSS comprise:

physical resource blocks, PRBs, not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

13. The base station of claim 11, wherein a starting position of the DMRS sequence of the frequency resource mapping not occupied by the SSS is related to the cell ID.

14. The base station of any of claims 11 to 13, wherein PBCH signals on the at least one OFDM symbol occupy contiguous frequency domain resources.

15. A user terminal, comprising:

a second receiving module, configured to receive PBCH signals transmitted by the base station on at least one OFDM symbol other than the OFDM symbol occupied by the SSS;

16. The user terminal of claim 15, wherein the frequency resources unoccupied by the SSS comprise:

PRBs not occupied by the SSS; and/or

REs not occupied by the SSS in PRBs occupied by the SSS.

17. The user terminal of claim 15, wherein the user terminal further comprises:

a first demodulation module, configured to perform channel estimation using a DMRS sequence received on at least one OFDM symbol to obtain a channel estimation value, and demodulate, using the channel estimation value, on the frequency resource not occupied by the SSS.

18. The user terminal of claim 15, wherein if the frequency resources not occupied by the SSS are mapped with DMRS sequences, and the at least one OFDM symbol is mapped with DMRS sequences initialized by cell ID and time information;

the user terminal further comprises:

a first estimating module, configured to perform channel estimation using a DMRS sequence received in the frequency resource not occupied by the SSS to obtain a DMRS channel estimation value, and perform channel estimation using the received SSS to obtain a SSS channel estimation value;

and the detection module is used for carrying out coherent detection on the DMRS sequence on the at least one OFDM symbol by using the DMRS channel estimation value and the SSS channel estimation value to obtain the time information of the DMRS sequence on the at least one OFDM symbol.

19. The user terminal of claim 18, wherein the user terminal further comprises:

a second estimation module, configured to perform channel estimation according to the DMRS sequence on the at least one OFDM symbol, to obtain a channel estimation value on the at least one OFDM symbol;

a second demodulation module, configured to demodulate a PBCH signal on the at least one OFDM symbol using the channel estimation value on the at least one OFDM symbol;

and a third demodulation module, configured to demodulate, using the DMRS channel estimation value, a PBCH signal on an OFDM symbol occupied by the SSS.

20. The user terminal of claim 15, wherein if the frequency resources not occupied by the SSS are mapped with DMRS sequences;

the user terminal further comprises:

a third estimation module, configured to perform channel estimation using the DMRS sequence received in the frequency resource not occupied by the SSS to obtain a DMRS channel estimation value, and perform channel estimation using the received SSS to obtain a SSS channel estimation value;

and the measurement module is used for performing Radio Resource Management (RRM) measurement by using the DMRS channel estimation value and the SSS channel estimation value.

21. A base station, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps in the method of transmission of PBCH signals according to any of claims 1 to 4.

22. A user terminal, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps in the method of transmission of PBCH signals according to any of claims 5 to 10.

23. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of transmission of a PBCH signal according to any one of claims 1 to 4.

24. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of transmission of a PBCH signal according to any one of claims 5 to 10.