CN113452489B

CN113452489B - Transmission method and system of synchronization information block, base station and terminal

Info

Publication number: CN113452489B
Application number: CN202010215709.9A
Authority: CN
Inventors: 李南希; 朱剑驰; 郭婧; 尹航; 佘小明; 陈鹏
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2022-09-16
Anticipated expiration: 2040-03-25
Also published as: CN113452489A

Abstract

The disclosure relates to a transmission method and system of a synchronization information block, a base station and a terminal, and relates to the technical field of communication. The method of the present disclosure comprises: the base station determines a synchronous information block SSB pattern according to the working frequency band; the base station determines each time domain position for sending the SSB and the index of each SSB according to the SSB pattern; each time domain position comprises an original time domain position and a newly added time domain position, and the index of the SSB of the newly added time domain position is a newly added index; the base station sends the SSB at each time domain position in an SSB period, wherein each SSB carries a bit for representing the index of the SSB, so that the terminal receives the SSB, demodulates the SSB to obtain the index of the SSB, and determines time domain information according to the SSB index.

Description

Transmission method and system of synchronization information block, base station and terminal

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method and a system for transmitting a synchronization information block, a base station, and a terminal.

Background

Unlike the LTE system, the NR (New Radio, New air interface) system packs a PBCH (Physical Broadcast Channel) and a Synchronization Signal into an SSB (Synchronization Signal Block) for reducing the number of signals on line for a long time, and uses the SSB for an initial cell search process of the UE. The SSB contains 3 parts: PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), and physical broadcast channel. The SSB occupies 4 OFDM symbols in the time domain and 20 PRB (Physical Resource Block) in the frequency domain, that is, 240 subcarriers.

According to 3GPP TS 38.101(V16.2.0), NRs define respective SSB patterns with respect to different frequency bands, and different SSB subcarrier spacings, respectively. The SSB start symbol position within a half frame is specified for different SSB patterns.

Disclosure of Invention

The inventor finds that: the SSBs within one SSB period of a 5G NR system may be transmitted at different time domain locations. For FR1 (below 6GHz) frequency bands, at most SSB transmissions at 8 time domain locations are currently supported. Since the SSB carries system broadcast information, the coverage performance of the SSB directly affects the access situation of the UE.

One technical problem to be solved by the present disclosure is: how to improve the coverage performance of the SSB.

According to some embodiments of the present disclosure, there is provided a method for transmitting a synchronization information block, including: the base station determines a synchronous information block (SSB) pattern according to the working frequency band; the base station determines each time domain position for sending the SSB and the index of each SSB according to the SSB pattern; each time domain position comprises an original time domain position and a newly added time domain position, and the index of the SSB of the newly added time domain position is a newly added index; the base station sends the SSB at each time domain position in an SSB period, wherein each SSB carries a bit for representing the index of the SSB, so that the terminal receives the SSB, demodulates the SSB to obtain the index of the SSB, and determines time domain information according to the SSB index.

In some embodiments, the new added index is represented by a demodulation reference signal DMRS sequence index and a preset bit in a physical broadcast channel PBCH in the SSB.

In some embodiments, the determining, by the base station, each time domain location for transmitting the SSB and the index of each SSB according to the SSB pattern includes: under the condition that the SSB pattern is Case A, a base station determines that in a half frame in an SSB period, the index of a first orthogonal frequency division multiplexing OFDM symbol corresponding to the time domain position of SSB sending is {2,8} +14X, wherein X belongs to A ═ 0,1, …, X }, and X ═ 4; and the base station determines the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 9 according to the OFDM symbol index in one semi-frame.

In some embodiments, the newly added indices are 8 and 9; the highest bit of the PBCH, which is converted into the binary value by the newly added index, is represented by a first preset bit in the payload bit of the PBCH, and the other bits except the highest bit are represented by the DMRS sequence index in the PBCH.

In some embodiments, the determining, by the base station, each time domain location for transmitting the SSB and the index of each SSB according to the SSB pattern includes: the method comprises the steps that a base station determines that a first Orthogonal Frequency Division Multiplexing (OFDM) symbol index corresponding to a time domain position for sending SSB in one half frame in an SSB period is {2,8} +14X under the condition that an SSB pattern is Case C, wherein X belongs to A ═ 0,1, …, X }, and X ═ 9; and the base station determines the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 19 according to the OFDM symbol index in one semi-frame.

In some embodiments, the newly added index is 8-19; the highest two bits of the newly added index converted into the binary value are represented by a first preset bit and a second preset bit in the effective load bits of the PBCH, and the other bits except the highest two bits are represented by the DMRS sequence index in the PBCH.

In some embodiments, the generation manner or the mapping position of the primary synchronization signal PSS in the SSB corresponding to the new index is different from the generation manner or the mapping position of the PSS in the other SSBs; or the generation mode or the mapping position of the secondary synchronization signal SSS in the SSB corresponding to the newly added index is different from the generation mode or the mapping position of the SSS in other SSBs; or the generation mode or the mapping position of the DMRS sequence corresponding to the new index is different from the generation mode or the mapping position of the DMRS in other SSBs.

According to other embodiments of the present disclosure, there is provided a method for transmitting a synchronization information block, including: a terminal receives one or more synchronous information blocks SSB respectively sent by a base station at one or more time domain positions at a working frequency band; wherein, the SSB carries a bit for representing the index of the SSB; the index comprises a newly added index; under the condition that the terminal supports to acquire the newly added index, the terminal selects an SSB for demodulation and acquires the index of the SSB; and the terminal determines the time domain information according to the index of the SSB and the SSB pattern corresponding to the working frequency band.

In some embodiments, the selecting, by the terminal, one SSB for demodulation includes: the terminal selects an SSB, demodulates a DMRS sequence index and preset bits in a physical broadcast channel PBCH in the SSB, and acquires the index of the SSB.

In some embodiments, the preset bit is a first preset bit in payload bits of the PBCH or the preset bit is a first preset bit and a second preset bit in payload bits of the PBCH.

In some embodiments, where the SSB pattern is Case a, one or more time domain locations are within one half frame in one SSB period, and a corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, X ═ 4; or, in the Case that the SSB pattern is Case C, one or more time domain positions are in one half frame in one SSB period, and the corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 9.

According to still other embodiments of the present disclosure, there is provided a base station including: the first determining module is used for determining a synchronous information block (SSB) pattern according to the working frequency band; a second determining module, configured to determine, according to the SSB pattern, each time domain position for sending the SSB and an index of each SSB; each time domain position comprises an original time domain position and a newly added time domain position, and the index of the SSB of the newly added time domain position is a newly added index; and the sending module is used for sending the SSB at each time domain position in an SSB period, wherein each SSB carries a bit for representing the index of the SSB, so that the terminal receives the SSB, demodulates the SSB to obtain the index of the SSB, and determines time domain information according to the SSB index.

In some embodiments, the second determining module is configured to determine, in a half frame of one SSB period, that a first OFDM symbol index corresponding to a time domain position of the SSB to be transmitted is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 4, where in the Case that the SSB pattern is Case a; according to the OFDM symbol index in a half frame, determining the index of each SSB as an integer which is greater than or equal to 0 and less than or equal to 9; or, the second determining module is configured to determine, in one half frame in one SSB period, that an index of a first OFDM symbol corresponding to a time-domain position where the SSB is sent is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 9, when the SSB pattern is Case C; and determining the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 19 according to the OFDM symbol index in one semi-frame.

In some embodiments, in the Case that the SSB pattern is Case a, the newly added indexes are 8 and 9, the highest bit converted into the binary value by the newly added index is represented by a first preset bit in the payload bits of the PBCH, and the other bits except the highest bit are represented by the DMRS sequence index in the PBCH; or, when the SSB pattern is Case C, the newly added index is 8 to 19, the highest two bits of the newly added index converted into binary values are represented by the first preset bit and the second preset bit in the payload bits of the PBCH, and the other bits except the highest two bits are represented by the DMRS sequence index in the PBCH.

According to still further embodiments of the present disclosure, there is provided a terminal including: a receiving module, configured to receive, in an operating frequency band, one or more synchronization information blocks SSBs that are respectively sent by a base station at one or more time domain positions; wherein, the SSB carries a bit for representing the index of the SSB; the index comprises a newly added index; the demodulation module is used for selecting an SSB for demodulation under the condition that the terminal supports the acquisition of the newly added index, and acquiring the index of the SSB; and the determining module is used for determining the time domain information according to the index of the SSB and the SSB pattern corresponding to the working frequency band.

In some embodiments, the demodulation module is configured to select an SSB, and demodulate a DMRS sequence index and preset bits in a physical broadcast channel PBCH in the SSB.

According to still other embodiments of the present disclosure, there is provided a transmission system of a synchronization information block, including: a base station of any of the preceding embodiments and a terminal of any of the preceding embodiments.

In the method, the base station determines the SSB pattern according to the working frequency band, determines the time domain position and the index of the SSB according to the SSB pattern, and increases a new time domain position relative to the original time domain position of the existing standard SSB, wherein the index of the SSB of the new time domain position is a new index. And then, the base station sends the SSB at each time domain position in an SSB period, and the terminal acquires the SSB index after receiving the SSB and synchronizes with the base station. Due to the addition of the new time domain position, more SSBs can be transmitted in one SSB period, so that the coverage performance of the SSBs can be improved, the problem of insufficient coverage of the SSBs possibly occurring in certain specific scenes is solved, the access success rate of the terminal is improved, and the compatibility of the existing terminal is not influenced.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 shows a flow diagram of a method of transmission of a synchronization information block of some embodiments of the present disclosure.

Fig. 2 shows a flow diagram of a method of transmitting a synchronization information block according to further embodiments of the disclosure.

Fig. 3 shows a schematic structural diagram of a base station of some embodiments of the present disclosure.

Fig. 4 illustrates a schematic structural diagram of a terminal of some embodiments of the present disclosure.

Fig. 5 shows a schematic structural diagram of a transmission system of a synchronization information block of some embodiments of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The present disclosure provides a transmission method of a synchronization information block, which can improve the coverage performance of an SSB, and is described below with reference to fig. 1. The scheme of the disclosure is particularly suitable for the scene that the carrier frequency is greater than 3GHz and belongs to the FR1 frequency band.

Fig. 1 is a flow chart of some embodiments of the disclosed synchronization information block transmission method. As shown in fig. 1, the method of this embodiment includes: steps S102 to S106.

In step S102, the base station determines an SSB pattern according to the operating frequency band.

The 3GPP TS 38.101 defines the correspondence between different frequency bands, different subcarrier spacings, and different SSB patterns. For example, the downlink frequency is 3550MHz to 3700MHz, the SSB subcarrier spacing is 30kHz, and the SSB pattern is Case C, which may be specifically referred to the specification in the standard and is not described herein again. The base station may determine the SSB pattern according to the operating frequency band. Most FR1 bands use SSB patterns of Case a and Case C, and the present disclosure is primarily directed to improvements on both SSB patterns.

In step S104, the base station determines, according to the SSB pattern, each time domain location where the SSB is transmitted and an index of each SSB.

According to 3GPP TS 38.213(V16.0.0), the time domain symbol positions of different SSB patterns differ. The base station may determine the respective time domain locations at which to transmit SSBs based on the SSB pattern. The SSB within one SSB period needs to be transmitted within one half frame time, i.e. 5 ms. In conjunction with the time domain location of the SSBs, the number of SSBs, and thus the index of the SSBs, may be determined. The SSB indices are used to indicate the order of transmission of the SSBs, e.g., the index of the first SSB may be 0, the index of the second SSB is 1, and so on.

Each time domain position of the SSB comprises an original time domain position and a newly added time domain position, and the index of the SSB of the newly added time domain position is a newly added index. The available time domain location of the SSB is improved in this disclosure, as follows.

For SSB pattern Case a, the subcarrier spacing of SSB is 15kHz, and the starting symbol position of SSB within a half frame may be 2, 8+14 n, as specified in the current standard. The inventor finds out through research that: a field 5ms field contains 5 slots, each slot containing 14 OFDM symbols for a total of 70 OFDM symbols. When n is 4, the start symbol position of the last SSB is OFDM symbol No. 64 (8+14 × 4 is 64). Therefore, for the SSB pattern Case a, the maximum value of n is 4, that is, SSB transmission at most 10 different time domain positions is supported in one SSB transmission period.

Therefore, in some embodiments, when the SSB pattern is Case a, the base station determines that, in one half frame of one SSB period, the index of the first OFDM symbol corresponding to the time domain location where the SSB is transmitted is {2,8} +14X, where X ∈ a ═ {0,1, …, X }, and X ═ 4. And the base station determines the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 9 according to the OFDM symbol index in one semi-frame. When x is 0-3, the corresponding time domain position is the original time domain position, and when x is 4, the corresponding time domain position is the newly added time domain position.

Compared with the current protocol version, for channel access of LTE and NR unshared spectrum, when the carrier frequency is greater than 3GHz and belongs to the FR1 frequency band, the maximum value of n is 3. The method of the above embodiment expands the maximum value of x (equivalent to n) to 4, which is equivalent to adding two new time domain positions, namely adding two new SSBs, and adding new indexes to 8 and 9 in the prior art.

For SSB pattern Case C, the subcarrier spacing of SSB is 30kHz, and the starting symbol position of SSB within a half frame may be 2, 8+14 m, as specified in the current standard. The inventor finds out through research that: a half frame, 5ms, contains 10 slots, each slot containing 14 OFDM symbols for a total of 140 OFDM symbols. When m is 9, the start symbol position of the last SSB is OFDM symbol number 134 (8+14 × 9 ═ 134). Therefore, for the SSB pattern Case C, m is maximally 9, that is, within one SSB transmission period, at most 20 SSB transmissions of different time domain positions can be supported.

Therefore, in some embodiments, when the SSB pattern is Case C, the base station determines that the index of the first OFDM symbol corresponding to the time domain location where the SSB is transmitted in one half frame in one SSB period is {2,8} +14X, where X ∈ a ═ {0,1, …, X }, and X ═ 9. And the base station determines the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 19 according to the OFDM symbol index in one semi-frame. When x is 0-3, the corresponding time domain position is the original time domain position, and when x is 4-19, the corresponding time domain position is the newly added time domain position.

Compared with the current protocol version, for channel access of LTE and NR unshared spectrum, when the carrier frequency is greater than 3GHz and belongs to the FR1 frequency band, the maximum value of m is 3. The method of the above embodiment expands the maximum value of x (equivalent to m) to 9, which is equivalent to that 12 new time domain positions are added in the prior art, that is, 12 SSBs are added, and the new index is 8-19.

According to the above embodiments, the base station may determine the first OFDM symbol position of the SSB in one half frame according to the SSB pattern, and one SSB occupies 4 OFDM symbols in the time domain, so that the time domain position of each SSB may be determined.

In step S106, the base station transmits SSBs at each time domain location within one SSB period.

SSBs within an SSB period may transmit using different beams. The SSB for each time domain location may correspond to a beam. Because the newly added time domain position is added, the maximum wave beam number L sent by the base station _max As well as increased. For example, in the Case where the SSB pattern is Case A, the maximum number of beams L _max At 10, 2 new beams are added relative to the prior art. In the Case where the SSB pattern is Case C, the maximum number of beams L _max At 20, 12 new beams are added relative to the prior art. The base station may be based on L _max The configuration of the beams is performed.

Each SSB carries a bit indicating an index of the SSB, so that the terminal receives the SSB, demodulates the SSB to obtain the index of the SSB, and determines time domain information according to the SSB index, thereby synchronizing with the base station, and performing subsequent cell search, random access, and other processes. In the existing standard, for channel access of LTE and NR unshared spectrum, when the carrier frequency is greater than 3GHz and belongs to the FR1 frequency band, the maximum SSB index is 7, and can be represented by 3 bits. While in Case of Case a, the new indexes of SSB are 8 and 9, in Case of Case C, the new indexes of SSB are 8-19, which cannot be represented by the original 3 bits.

In the existing standard, a terminal may calculate an SSB index with 3 least significant bits according to a DMRS sequence index (Demodulation Reference Signal) in a PBCH in the SSB. The present disclosure improves the representation method of the SSB index, as follows.

In some embodiments, the newly added index of the SSB is represented by a DMRS sequence index and preset bits in the PBCH in the SSB. For example, in the Case of Case A in the SSB pattern, the most significant bit of the PBCH is used to convert the newly added index into binary value

Indicating that the bits other than the most significant bit are indicated by the DMRS sequence index in the PBCH. Under the condition that the SSB pattern is Case C, the highest two bits of the binary values converted from the newly added index adopt the effective load bits of PBCH

And

it means that the other bits except the top two bits are indicated by DMRS sequence index in PBCH.

In case that the index of the SSB is greater than 7 and equal to or less than 15, 1 additional bit is required to represent the indexes of all SSBs, and the most significant bit of the index of the SSB is represented by the payload bit of the PBCH

It is decided that,

defined in section 7.1.1 of 3GPP TS 38.212.

In the case that the index of the SSB is greater than 15 and less than or equal to 20, 2 additional bits are needed to represent the indexes of all SSBs, and the top 2 bits of the index of the SSB are represented by the payload bits of PBCH

Determination of wherein

The most significant bit of the SSB index is represented,

the second highest order bit of the SSB index is represented,

and

defined in section 7.1.1 of 3GPP TS 38.212.

Some terminals do not support the acquisition of the new index of the SSB, and such terminals may be referred to as old terminals, while terminals supporting the acquisition of the new index of the SSB may be referred to as new terminals. In view of the compatibility of the solution disclosed to the old terminal, it needs to be ensured that the old terminal and the base station have consistent understanding of the index of the SSB, which is described in detail below.

Assume that the old SSB beam index is 0,1, …,7, and is represented in binary form as 000,001, …, 111. The SSB new index is 8, and is represented by a binary number of 1000. For the old terminal, the index of the SSB may be calculated according to the DMRS sequence index in the PBCH. However, in this case, since the SSB with index 0 and the SSB with index 8 have the same lower 3 bits, the old terminal calculates the SSB index only from the DMRS sequence index, and may misunderstand the SSB with index 8 as the SSB with index 0. Therefore, if the old terminal demodulates the SSB information with index 8, it may cause the old terminal to obtain the wrong system time domain information. Therefore, in order to ensure compatibility with these old terminals, it is necessary to ensure that the old terminals cannot demodulate the new index or the SSB corresponding to the new index correctly.

For example, the generation manner or mapping position of the PSS, SSS, and DMRS sequences may be changed so that the old terminal cannot correctly demodulate the corresponding information. That is, the generation manner or mapping position of the PSS in the SSB corresponding to the new index is different from the generation manner or mapping position of the PSS in other SSBs; or the SSS generation mode or mapping position in the SSB corresponding to the newly added index is different from the SSS generation mode or mapping position in other SSBs; or the generation mode or the mapping position of the DMRS sequence corresponding to the new index is different from the generation mode or the mapping position of the DMRS in other SSBs.

In the above embodiment, the base station determines the SSB pattern according to the working frequency band, and determines the time domain position and the index of the SSB according to the SSB pattern, and compared with the original time domain position of the existing standard SSB, the new time domain position is added, and the index of the SSB of the new time domain position is the new index. Furthermore, the base station sends the SSBs through different beams at each time domain position in one SSB period, and the terminal acquires the SSB index after receiving the SSBs and synchronizes with the base station. Due to the fact that the new time domain position is added, the number of the corresponding beams is increased, more SSBs can be transmitted in one SSB period, accordingly, the coverage performance of the SSBs can be improved, the problem that the SSBs are not covered enough in certain specific scenes can be solved, the access success rate of the terminal is improved, and the compatibility of the existing terminal cannot be influenced.

Further embodiments of the disclosed method for transmitting synchronization information blocks are described below in conjunction with fig. 2.

Fig. 2 is a flow chart of another embodiment of a method for transmitting a synchronization block according to the present disclosure. As shown in fig. 2, the method of this embodiment includes: steps S202 to S206.

In step S202, the terminal receives, in the operating frequency band, one or more SSBs respectively transmitted by the base station at one or more time domain locations.

The terminal may scan the operating band and may receive one or more beams. The beam corresponds to the SSB, and the SSB carries a bit for representing the index of the SSB; the index includes a new addition index.

In the Case where the SSB pattern is Case a, one or more time domain positions are within one half frame in one SSB period, and the corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 4. Or, in the Case that the SSB pattern is Case C, one or more time domain positions are in one half frame in one SSB period, and the corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 9.

In step S204, in the case that the terminal supports the acquisition of the new index, the terminal selects an SSB for demodulation, and acquires an index of the SSB.

For example, the terminal demodulates in the SSBAnd acquiring the index of the SSB by the DMRS sequence index and the preset bit in the PBCH. The predetermined bits are, for example, payload bits of PBCH

And

after the SSB indexes of 3 low-order bits are obtained by detecting the terminal supporting the acquisition of the newly added index, the effective load bits of the PBCH are continuously detected

And obtaining the highest 2 bits of the SSB index to obtain the SSB index. And under the condition that the terminal does not support the acquisition of the newly added index, the terminal only demodulates the DMRS sequence index in the PBCH to obtain the SSB index.

In the case where the terminal receives a plurality of beams, one beam may be selected according to the signal quality of the received beam, for example, the beam with the best signal quality is selected. The mode of selecting beams by the terminal may be selected according to actual requirements, and is not limited to the examples given.

In step S206, the terminal determines time domain information according to the SSB index and the SSB pattern corresponding to the operating frequency band.

After the successful acquisition of the SSB index, the UE may acquire complete information of the time domain, including a frame number, a subframe number, and a slot number, and may perform synchronization with the base station, and perform subsequent cell search, random access, and other steps, which are not described herein again.

Accordingly, the overall scheme of the present disclosure is: in an SSB period, the base station firstly carries out SSB transmission at an original SSB time domain position, and then carries out new SSB transmission at a newly added SSB time domain position, and the new SSB wave beam can be used as the coverage supplement of the old SSB wave beam to enhance the weak coverage area of the old SSB wave beam. Different detection behaviors exist for different terminals. For the new terminal, the original index and the new index of the SSB can be detected at the same time, so that the most suitable wave beam can be selected from all the wave beams to demodulate the SSB information; for old terminals, only old SSB beams can be detected, so the scheme does not affect the cell search performance of these terminals, which is equivalent to the scheme being substantially transparent to these UEs. After the terminal correctly demodulates the SSB information, the cell search and the subsequent random access procedure can be continuously completed in the original manner.

Some application examples of the present disclosure are described below.

Assuming that the original index of SSB is 0,1, …,7, and expressed in binary, 000,001, …,111, the DMRS indication of the original index PBCH is accompanied by payload bits of PBCH

And setting 0. The SSB new index is {8,9, …,17}, and is represented by {1000,1001, …,10001} in binary, the lower 3 bits of the new index are indicated by DMRS of PBCH, and the upper 2 bits are respectively indicated by payload bits of PBCH

And (4) indicating. For the old terminal, the scheme of the present invention has no influence on the old terminal because it cannot demodulate the new SSB beam with index {8,9, …,17}, and only the old SSB beam can be searched as seen by the old terminal, so the SSB detection can still be performed by using the original cell search method.

For a new terminal, the old and new SSB beams may be detected simultaneously. The new terminal needs to detect the payload bits of the PBCH

And obtaining the highest 2 bits of the SSB index to obtain the SSB index. If the beam 7 is the most suitable beam detected by the new terminal, the SSB index obtained by the new terminal is "00111"; if the beam 15 is the most suitable beam detected by the new terminal E, the index number of the SSB obtained by the new terminal is "01111"; if the most suitable beam is detected by the beam number 17 for the new terminal, the index number of the SSB obtained by the new terminal is "10001". So far, the UE has already obtained the time domain information related to the SSB beam, and can perform subsequent cell detection and random access according to the original procedure.

The present disclosure also provides a base station, described below in conjunction with fig. 3.

Fig. 3 is a block diagram of some embodiments of a base station of the present disclosure. As shown in fig. 3, the base station 30 of this embodiment includes: a first determination module 310, a second determination module 320, and a sending module 330.

The first determining module 310 is configured to determine a synchronization information block SSB pattern according to the operating frequency band.

The second determining module 320 is configured to determine, according to the SSB pattern, each time domain position for sending the SSB and an index of each SSB; each time domain position comprises an original time domain position and a newly added time domain position, and the index of the SSB of the newly added time domain position is a newly added index.

In some embodiments, the second determining module 320 is configured to determine that, in one half frame of one SSB period, a first OFDM symbol index corresponding to a time domain position of the SSB to be sent is {2,8} +14X, where X ∈ a { (0, 1, …, X }, and X ═ 4, in Case that the SSB pattern is Case a; according to the OFDM symbol index in a half frame, determining the index of each SSB as an integer which is greater than or equal to 0 and less than or equal to 9; or, the second determining module 320 is configured to determine, in one half frame in one SSB period, that a first OFDM symbol index corresponding to a time domain position of the SSB to be transmitted is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 9, when the SSB pattern is Case C; and determining the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 19 according to the OFDM symbol index in one semi-frame.

In some embodiments, in the Case that the SSB pattern is Case a, the newly added indexes are 8 and 9, the highest bit converted into the binary value by the newly added index is represented by a first preset bit in the payload bits of the PBCH, and the other bits except the highest bit are represented by the DMRS sequence index in the PBCH; or, when the SSB pattern is Case C, the newly added index is 8-19, the highest two bits of the newly added index converted into binary values are represented by the first preset bit and the second preset bit in the payload bits of the PBCH, and the other bits except the highest two bits are represented by the DMRS sequence index in the PBCH.

The sending module 330 is configured to send an SSB at each time domain position in an SSB period, where each SSB carries a bit used to indicate an index of the SSB, so that the terminal receives the SSB, demodulates the SSB to obtain the index of the SSB, and determines time domain information according to the SSB index.

The present disclosure also provides a terminal, described below in conjunction with fig. 4.

Fig. 4 is a block diagram of some embodiments of the terminal of the present disclosure. As shown in fig. 4, the terminal 40 of this embodiment includes: a receiving module 410, a demodulating module 420 and a determining module 430.

The receiving module 410 is configured to receive, in an operating frequency band, one or more synchronization information blocks SSBs that are respectively sent by a base station at one or more time domain positions; wherein, the SSB carries a bit for representing the index of the SSB; the index includes a new addition index.

The demodulation module 420 is configured to select an SSB for demodulation and obtain an index of the SSB when the terminal supports obtaining the new index.

In some embodiments, where the SSB pattern is Case a, one or more time domain locations are within one half frame in one SSB period, and the corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, X ═ 4; or, in the Case that the SSB pattern is Case C, one or more time domain positions are in one half frame in one SSB period, and the corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 9.

In some embodiments, the demodulation module 420 is configured to select an SSB, and demodulate a DMRS sequence index and preset bits in a physical broadcast channel PBCH in the SSB.

The determining module 430 is configured to determine time domain information according to the SSB index and the SSB pattern corresponding to the operating frequency band.

The present disclosure also provides a transmission system of a synchronization information block, which is described below with reference to fig. 5.

Fig. 5 is a block diagram of some embodiments of the disclosed transmission system for synchronization information blocks. As shown in fig. 5, the transmission system 5 of this embodiment includes: a base station 30 of any of the preceding embodiments and a terminal 40 of any of the preceding embodiments.

As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. A method for transmitting a synchronization information block, comprising:

the base station determines a synchronous information block (SSB) pattern according to the working frequency band;

the base station determines each time domain position for sending the SSB and the index of each SSB according to the SSB pattern; the time domain positions comprise an original time domain position and a newly added time domain position, and the index of the SSB of the newly added time domain position is a newly added index;

and the base station sends the SSB at each time domain position in an SSB period, wherein each SSB carries a bit for representing the index of the SSB, so that the terminal receives the SSB, demodulates the SSB to obtain the index of the SSB, and determines time domain information according to the SSB index.

2. The transmission method according to claim 1,

the new index is represented by a demodulation reference signal DMRS sequence index and a preset bit in a physical broadcast channel PBCH in the SSB.

3. The transmission method according to claim 1,

the base station determining, according to the SSB pattern, each time domain location for transmitting the SSB and an index of each SSB includes:

the base station determines that in a half frame in an SSB period, an index of a first orthogonal frequency division multiplexing OFDM symbol corresponding to a time domain position where the SSB is transmitted is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 4, where the SSB pattern is Case a;

and the base station determines the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 9 according to the OFDM symbol index in one semi-frame.

4. The transmission method according to claim 3,

the newly added indexes are 8 and 9;

the highest bit converted into the binary value by the new index is represented by a first preset bit in the effective load bit of a physical broadcast channel PBCH, and the other bits except the highest bit are represented by the DMRS sequence index of the demodulation reference signal in the PBCH.

5. The transmission method according to claim 1,

the base station determines that the index of a first orthogonal frequency division multiplexing OFDM symbol corresponding to the time domain position of the SSB is {2,8} +14X in one half frame in one SSB period under the condition that the SSB pattern is Case C, wherein X belongs to A ═ 0,1, …, X }, and X is 9;

and the base station determines the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 19 according to the OFDM symbol index in a half frame.

6. The transmission method according to claim 5,

the newly added index is 8-19;

the highest two bits of the newly added indexes converted into binary values are represented by a first preset bit and a second preset bit in the effective load bits of a physical broadcast channel PBCH, and the other bits except the highest two bits are represented by the DMRS sequence index of the demodulation reference signal in the PBCH.

7. The transmission method according to claim 1,

the generation mode or the mapping position of the primary synchronization signal PSS in the SSB corresponding to the new added index is different from the generation mode or the mapping position of the PSS in other SSBs;

or the generation mode or the mapping position of the secondary synchronization signal SSS in the SSB corresponding to the newly added index is different from the generation mode or the mapping position of the SSS in other SSBs;

or the generation mode or the mapping position of the DMRS sequence corresponding to the new index is different from the generation mode or the mapping position of the DMRS in other SSBs.

8. A method for transmitting a synchronization information block, comprising:

a terminal receives one or more synchronous information blocks SSB respectively sent by a base station at one or more time domain positions in a working frequency band; wherein, the SSB carries a bit for representing the index of the SSB; the index comprises a newly added index;

under the condition that the terminal supports the acquisition of the new index, the terminal selects an SSB for demodulation and acquires the index of the SSB;

and the terminal determines time domain information according to the index of the SSB and the SSB pattern corresponding to the working frequency band.

9. The transmission method according to claim 8,

the terminal selects an SSB for demodulation, and the demodulation comprises the following steps:

the terminal selects an SSB, and demodulates a demodulation reference signal DMRS sequence index and preset bits in a physical broadcast channel PBCH in the SSB.

10. The transmission method according to claim 9,

the preset bits are first preset bits in the payload bits of the PBCH or the preset bits are first preset bits and second preset bits in the payload bits of the PBCH.

11. The transmission method according to claim 8,

in the Case that the SSB pattern is Case a, the one or more time domain positions are within one half frame in one SSB period, and a corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X ], and X ═ 4;

or, in the Case that the SSB pattern is Case C, the one or more time domain positions are within one half frame in one SSB period, and the corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 9.

12. A base station, comprising:

the first determining module is used for determining a synchronous information block (SSB) pattern according to the working frequency band;

a second determining module, configured to determine, according to the SSB pattern, each time domain position for sending an SSB and an index of each SSB; the time domain positions comprise an original time domain position and a newly added time domain position, and the index of the SSB of the newly added time domain position is a newly added index;

and the sending module is used for sending the SSBs at each time domain position in an SSB period, wherein each SSB carries a bit for representing the index of the SSB, so that the terminal receives the SSB, demodulates the SSB to obtain the index of the SSB, and determines time domain information according to the SSB index.

13. The base station of claim 12, wherein,

the newly added index is represented by a demodulation reference signal DMRS sequence index and a preset bit in a physical broadcast channel PBCH in the SSB.

14. The base station of claim 12, wherein,

the second determining module is configured to determine, in a half frame of one SSB period, that a first OFDM symbol index corresponding to a time domain position where an SSB is transmitted is {2,8} +14X, where X ∈ a ═ 0,1, …, X ], and X ═ 4, where in the Case that the SSB pattern is Case a; according to the OFDM symbol index in a half frame, determining the index of each SSB as an integer which is greater than or equal to 0 and less than or equal to 9;

or, the second determining module is configured to determine, in one half frame in one SSB period, that a first OFDM symbol index corresponding to a time domain position where an SSB is sent is {2, 8] +14X, where X ∈ a ═ 0,1, …, X }, and X ═ 9, when the SSB pattern is Case C; and determining the index of each SSB to be an integer which is greater than or equal to 0 and less than or equal to 19 according to the OFDM symbol index in one semi-frame.

15. The base station of claim 14, wherein,

under the condition that the SSB pattern is Case A, the newly added indexes are 8 and 9, the highest bit converted into a binary value of the newly added indexes is represented by a first preset bit in a payload bit of a Physical Broadcast Channel (PBCH), and the other bits except the highest bit are represented by a demodulation reference signal (DMRS) sequence index in the PBCH;

or, when the SSB pattern is Case C, the newly added index is 8 to 19, the highest two bits converted into binary values are represented by a first preset bit and a second preset bit in the payload bits of the PBCH, and the other bits except the highest two bits are represented by the DMRS sequence index in the PBCH.

16. The base station of claim 12, wherein,

17. A terminal, comprising:

a receiving module, configured to receive, in an operating frequency band, one or more synchronization information blocks SSBs that are respectively sent by a base station at one or more time domain positions; wherein, the SSB carries bits used for representing the index of the SSB; the index comprises a newly added index;

the demodulation module is used for selecting an SSB for demodulation under the condition that the terminal supports the acquisition of the new index, and acquiring the index of the SSB;

and the determining module is used for determining the time domain information according to the index of the SSB and the SSB pattern corresponding to the working frequency band.

18. The terminal of claim 17, wherein,

the demodulation module is used for selecting one SSB and demodulating a demodulation reference signal DMRS sequence index and preset bits in a physical broadcast channel PBCH in the SSB.

19. The terminal of claim 18, wherein,

the preset bit is a first preset bit in the payload bits of the PBCH or the preset bit is a first preset bit and a second preset bit in the payload bits of the PBCH.

20. The terminal of claim 17, wherein,

in the Case that the SSB pattern is Case a, the one or more time domain positions are within one half frame in one SSB period, and a corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0, 1., X }, and X ═ 4;

or, in the Case that the SSB pattern is Case C, the one or more time domain positions are within one half frame in one SSB period, and the corresponding first OFDM symbol index is {2,8} +14X, where X ∈ a ═ 0, 1.. and X ═ 9.

21. A transmission system of synchronization information blocks, comprising:

the base station of any of claims 12 to 16 and the terminal of any of claims 17 to 20.