CN110769433A - Synchronous signal access method, base station and terminal - Google Patents
Synchronous signal access method, base station and terminal Download PDFInfo
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- CN110769433A CN110769433A CN201810834573.2A CN201810834573A CN110769433A CN 110769433 A CN110769433 A CN 110769433A CN 201810834573 A CN201810834573 A CN 201810834573A CN 110769433 A CN110769433 A CN 110769433A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
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Abstract
The embodiment of the invention provides a synchronous signal access method, a base station and a terminal. The method is applied to a base station, and comprises the following steps: monitoring the occupation state of a channel of the base station in a preset monitoring period; if the number of occupied target channels is monitored to meet a preset condition, determining a target synchronization signal block of a directional antenna beam corresponding to the target channels; and transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block. The embodiment of the invention is based on a synchronous signal block and a beam scanning technology, and adopts a directional detection and supplementary transmission method to enable the gNB to transmit the synchronous signal with lower collision probability and higher efficiency. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
Description
Technical Field
The embodiment of the invention relates to the technical field of mobile communication, in particular to a synchronous signal access method, a base station and a terminal.
Background
In mobile communication systems, in order to meet the higher demand of available frequency Bands for future 5G communication networks, 3GPP organizations have confirmed that on the basis of using conventional licensed frequency spectrum, 5G Unlicensed frequency spectrum (NR-U) will be used in 5G networks, such as frequency Bands below 7GHz, frequency Bands below 7-52.6GHz, and/or frequency Bands above 52.6GHz, etc.; the NR-U is used by means of technologies such as Massive MIMO (Massive MIMO), high-frequency communication and beam forming in a 5G network, so that the shortage of authorized spectrum is made up, and the transmission efficiency and the coverage range are improved.
Since the channel bandwidth of the unlicensed spectrum is higher than 5MHz, two deployment manners of Non-independent Networking (NSA) or independent networking (SA) may be adopted to support carrier aggregation between licensed frequency bands of New Radio (NR) and support a deployment scenario of dual connectivity between NR and LTE licensed frequency bands. The NR-U band also needs to satisfy the regulatory requirements of each region for the corresponding band, and is fairly coexistent with other systems Using the same band, such as Wi-Fi, bluetooth, and LTE-Assisted authorized Access LTE (LAA-LTE).
However, the use of the NR-U band is still under study, and 3GPP only defines the design principle of the related art, and how to use the NR-U band is still a problem to be solved. On one hand, 3GPP has already studied the use of unlicensed spectrum in 3G and 4G network stages, forming, for example, LAA-LTE technology and LTE-in-unlicensed spectrum (LTE-U) technology, and as a relatively complete unlicensed spectrum use mechanism, it can implement non-independent networking operation, and has an obvious reference meaning for the research of NR-U related technologies; on the other hand, 3GPP has currently formed a whole set of standard protocols supporting 5G NR independent networking and non-independent networking, and has a guiding role in subsequently incorporating the use of NR-U frequency bands into a 5G network.
Disclosure of Invention
The embodiment of the invention provides a synchronous signal access method, a base station and a terminal, which are used for realizing the use of an NR-U frequency band and meeting the higher requirement of a 5G communication network on an available frequency band.
In one aspect, an embodiment of the present invention provides a synchronization signal access method, which is applied to a base station, and the method includes:
monitoring the occupation state of a channel of the base station in a preset monitoring period;
if the number of occupied target channels is monitored to meet a preset condition, determining a target synchronization signal block of a directional antenna beam corresponding to the target channels;
and transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block.
In one aspect, an embodiment of the present invention provides a synchronization signal access method, which is applied to a terminal, and the method includes:
receiving a non-target synchronous signal block transmitted by a base station in a preset transmission period; the non-target synchronous signal block is a synchronous signal block corresponding to a wave beam of which the channel is not occupied in a preset monitoring period;
after the preset transmitting period is finished, receiving a target synchronous signal block of a directional antenna beam corresponding to a target channel, which is additionally transmitted by the base station; and the target channel is an occupied channel in the preset transmission period.
In another aspect, an embodiment of the present invention provides a base station, where the base station includes:
the monitoring module is used for monitoring the occupation state of the channel of the base station in a preset monitoring period;
the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a target synchronization signal block of a directional antenna beam corresponding to an occupied target channel if the number of the occupied target channel is monitored to meet a preset condition;
and the transmitting module is used for transmitting a non-target synchronous signal block in a preset transmitting period and complementarily transmitting the target synchronous signal block after the preset transmitting period is finished.
In another aspect, an embodiment of the present invention provides a terminal, where the terminal includes:
the first receiving module is used for receiving a non-target synchronization signal block transmitted by a base station in a preset transmitting period; the non-target synchronous signal block is a synchronous signal block corresponding to a wave beam of which the channel is not occupied in a preset monitoring period;
a second receiving module, configured to receive, after the preset transmission period is ended, a target synchronization signal block of a directional antenna beam corresponding to a target channel, where the target synchronization signal block is complementarily transmitted by the base station; and the target channel is an occupied channel in the preset transmission period.
On the other hand, the embodiment of the present invention further provides an electronic device, which includes a memory, a processor, a bus, and a computer program stored on the memory and executable on the processor, where the processor implements the steps in the synchronization signal access method when executing the program.
In still another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the above-mentioned synchronization signal access method.
According to the synchronous signal access method, the base station and the terminal provided by the embodiment of the invention, the occupied state of the channel of the base station is monitored in a preset monitoring period based on an LBT mechanism; if the number of occupied target channels is monitored to meet a preset condition, starting a supplementary transmitting mechanism, determining a target synchronous signal block of a directional antenna beam corresponding to the target channels, transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block; the embodiment of the invention is based on the synchronous signal block and the beam scanning technology, adopts the directional detection and the supplementary transmission method, enables the gNB to transmit the synchronous signal with lower collision probability and higher efficiency, and shortens the time required by the initial access of the UE. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a synchronization signal access method according to an embodiment of the present invention;
FIG. 2 is a diagram of a synchronization signal block according to an embodiment of the present invention;
fig. 3 is a schematic diagram of beam directions of an antenna array in polar coordinates according to a first example of the embodiment of the present invention;
FIG. 4 is a schematic time-frequency structure diagram of a SSB according to a first example of the embodiment of the present invention;
FIG. 5 is a schematic diagram of a first exemplary transmission process in accordance with an embodiment of the present invention;
fig. 6 is a schematic diagram of a supplementary transmission process of a second example of the embodiment of the present invention;
fig. 7 is a second flowchart illustrating a synchronization signal access method according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but 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.
Fig. 1 shows a flowchart of a synchronization signal access method according to an embodiment of the present invention.
Based on Massive MIMO and beamforming technology, L beamforming matrices, which are respectively W1, … and WL, are configured for a 5G base station (gNB) end in a communication scenario using an NR-U unlicensed frequency band (unlicensed spectrum), and each beamforming matrix corresponds to one directional antenna beam, so that L directional antenna beams can be formed. According to the existing standard, L may take the value of 4, 8 or 64 for different frequency bands.
In the configuration process, the L directional antenna beams have the same beam shape and different directions, are uniformly distributed in the horizontal direction of a gNB airspace, and completely cover the range of a cell.
Each beam corresponds to a Block of Synchronization Signals (SSB), see fig. 2, where the horizontal axis in fig. 2 indicates time; let L synchronization signal blocks be SSB respectively1，…，SSBL(ii) a Each synchronization signal block is transmitted through a beam corresponding to the synchronization signal block, and each beam corresponds to a channel, so that a User Equipment (UE) or a terminal (User Equipment) acquires air interface information and establishes a connection with the gNB.
As a first example, fig. 3 gives a diagram of the beam directions of the antenna array in polar coordinates, and in fig. 3, taking the horizontal coverage angle of the gNB as 360 degrees as an example, a main lobe schematic diagram of two beams SS1, SS2 is shown, the two beams SS1, SS2 being generated by the shaping matrices W1, W2, respectively.
Referring to fig. 4, fig. 4 shows a time-frequency composition diagram of the SSB, wherein the horizontal axis indicates the time domain (T) and the vertical axis indicates the frequency domain (F); SSB includes Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and broadcast channel Signal (PBCH); the SSBs are respectively composed of different Orthogonal Frequency Division Multiplexing (OFDM) symbols. SSBs 1, …, SSBLs correspond to L beams, respectively.
Referring to fig. 5, SSBburst1 is transmitted in the first slot1 over a transmit window (Burst set window), with the gbb transmitting all signal blocks in sequence over N slots as the beam pointing direction changes in sequence.
As shown in fig. 1, the synchronization signal access method provided in the embodiment of the present invention is applied to a base station, and the method specifically includes the following steps:
Based on a Listen and avoid mechanism (Listen Before Talk, LBT), availability of a channel in an unlicensed frequency band cannot be guaranteed at any time, and therefore, LBT requires that the channel is monitored Before data transmission, idle channel assessment is performed, and data transmission is performed under the condition that the channel is guaranteed to be idle, and therefore, in a preset monitoring period, an occupied state of the channel of the base station is monitored, wherein the occupied state includes occupied or unoccupied.
A monitoring timer may be set for the channel, and a preset monitoring period is timed before the gNB transmits the synchronization signal, where the timing period of the monitoring timer is the duration of a single channel monitoring.
With reference to fig. 2 to 5, in the NR-U frequency band, the channel states corresponding to the L beams are monitored by using a directional detection method, and the number of target channels, that is, occupied channels, is recorded; if the number of the target channels is detected to meet the preset condition, starting a supplementary transmitting mechanism; at this time, the synchronization signal block of the beam corresponding to each target channel is recorded, the synchronization signal block is called a target synchronization signal block, and the target synchronization signal block is grouped into a set SO, SO ═ SSBi, SSBj …, and the number of elements in the SO is NO.
After the supplementary transmitting mechanism is started, transmitting a non-target synchronous signal block, namely a synchronous signal block corresponding to a beam of which a channel is not occupied in a preset transmitting period; the preset transmission period is less than or equal to the maximum channel occupation time Tt, and the transmission time Ts of a single SSB is far less than Tt.
For example, when the preset transmission period is Tt, during the time period of (0, Tt), each non-target synchronization signal block is sequentially transmitted on the corresponding beam according to the frame format specified in the NR standard according to the preset parameter set.
After the preset transmission period is finished, complementarily transmitting a target synchronous signal block, namely complementarily transmitting the SSB of the set SO; for example, the i-th beam is used to transmit the SSBi in a time period of (Tt, Tt + Ts), the j-th beam is used to transmit the SSBj in a time period of (Tt + Ts, Tt +2 Ts), and the SSBs in the set SO are transmitted sequentially until all the SSBs in the set SO are transmitted.
As a second example, referring to fig. 6, a process of SSB2 supplemental transmission is shown in fig. 6, where a non-target SSB is transmitted during a time period of (0, Tt) and SSB2 is supplemental transmitted using the 2 nd beam during a time period of (Tt, Tt + Ts).
In the above embodiment of the present invention, based on an LBT mechanism, in a preset monitoring period, an occupied state of a channel of the base station is monitored; if the number of occupied target channels is monitored to meet a preset condition, starting a supplementary transmitting mechanism, determining a target synchronous signal block of a directional antenna beam corresponding to the target channels, transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block; the embodiment of the invention is based on the synchronous signal block and the beam scanning technology, adopts the directional detection and the supplementary transmission method, enables the gNB to transmit the synchronous signal with lower collision probability and higher efficiency, and shortens the time required by the initial access of the UE. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
It should be noted that, in the embodiment of the present invention, for different frequency bands, an LAA-LTE channel access mechanism is respectively used as a reference line or a starting point in an NR-U frequency band channel access process, and an NR HARQ feedback mechanism is used as a reference line for an NR-U frequency band HARQ enhancement design.
Optionally, the usage of the unlicensed spectrum also needs to consider requirements in terms of Maximum Channel Occupancy Bandwidth (MCOB), Maximum Channel Occupancy Time (MCOT), and the like.
Optionally, in this embodiment of the present invention, the step of transmitting the non-target synchronization signal block in the preset transmission period includes:
determining each time slot corresponding to the non-target synchronization signal block in a preset transmitting period;
and transmitting the non-target synchronous signal block corresponding to the current time slot in each time slot.
Determining a beam corresponding to an unoccupied channel, a time slot corresponding to the beam and a non-target synchronization signal block in a current preset transmitting period;
and on a transmitting window, with the sequential change of the beam direction, the gNB sequentially transmits the non-target synchronization signal block corresponding to the current time slot on each time slot until the transmission is finished.
Optionally, in this embodiment of the present invention, after the step of complementarily transmitting the target synchronization signal block after the preset transmission period ends, the method includes:
and after the preset transmitting period is finished, sequentially supplementing and transmitting the target synchronous signal blocks according to the sequence of the time slots corresponding to the target synchronous signal blocks.
After the preset transmission period is finished, sequentially transmitting the target SSBs according to the sequence of the time slots corresponding to the target synchronization signal blocks, namely the sequence of the time slots corresponding to each target SSB of the supplementary transmission set SO; for example, if SO is { SSBi, SSBj … }, and the target SSBs are arranged in order, the i-th beam is used to transmit SSBi in the time period of (Tt, Tt + Ts), and the j-th beam is used to transmit SSBj in the time period of (Tt + Ts, Tt +2 Ts), and the SSBs in the set SO are transmitted sequentially until all the SSBs are transmitted.
Further, in this embodiment of the present invention, the synchronization signal block includes a broadcast channel signal, that is, a PBCH;
the step of supplementary transmitting the target synchronization signal block includes:
after adding a scrambling code in the broadcast channel signal of the target synchronization signal block, complementarily transmitting the target synchronization signal block; wherein the scrambling code is used for indicating the sequence of the time slots corresponding to the target synchronization signal block.
In this step, in order to avoid ambiguity of the time position of the target SSB in the identification set SO of the UE, and when it cannot be determined whether the target SSB is at the normal position or the supplemental transmission position, for these target SSBs, a scrambling code is attached to the PBCH signal in a scrambling code manner, where the scrambling code is used to indicate the order of the time slots corresponding to the target SSB, that is, the sequence number information of the element in the SO.
Meanwhile, in order to not occupy the system information resource of PBCH, a group of ordered scrambling code groups { SCk } (1 ≦ k ≦ M) containing M scrambling codes is used to carry the scrambling codes, and the kth element (target SSB) in the set SO scrambles PBCH information by using the kth scrambling code SCk. In particular, the construction of the scrambling codes may employ known sequences having good auto-and cross-correlation properties, such as gold sequences and the like.
Optionally, in this embodiment of the present invention, the preset condition is that the number of the target channels is less than or equal to a preset threshold.
And if the number NO of elements in the SO is less than or equal to N, determining that the number of the target channels meets a preset condition.
In the above embodiment of the present invention, based on an LBT mechanism, in a preset monitoring period, an occupied state of a channel of the base station is monitored; if the number of occupied target channels is monitored to meet a preset condition, starting a supplementary transmitting mechanism, determining a target synchronous signal block of a directional antenna beam corresponding to the target channels, transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block; the embodiment of the invention is based on a synchronous signal block and a beam scanning technology, and adopts a directional detection and supplementary transmission method to enable the gNB to transmit the synchronous signal with lower collision probability and higher efficiency. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
The synchronization signal access method provided by the embodiment of the present invention is described above from the base station side, and the synchronization signal access method provided by the embodiment of the present invention is described below from the terminal side with reference to the accompanying drawings.
Referring to fig. 7, an embodiment of the present invention provides a synchronization signal access method, which is applied to a terminal, and the method includes:
Receiving a non-target synchronous signal block transmitted by a base station in a preset transmitting period, wherein the non-target synchronous signal block is a synchronous signal block corresponding to a beam of which a channel is not occupied in the preset monitoring period; the preset transmission period is less than or equal to the maximum channel occupation time Tt, and the transmission time Ts of a single SSB is far less than Tt.
For example, when the preset transmission period is Tt, in the time period of (0, Tt), the base station sequentially transmits each non-target synchronization signal block on the corresponding beam according to the preset parameter set by using the frame format specified in the NR standard, and the terminal receives the non-target synchronization signal blocks.
After the base station starts a supplementary transmission mechanism and a preset transmission period is finished, the terminal supplementarily receives a target synchronous signal block, namely receives the SSB of a supplementary transmission set SO; for example, in the time period of (Tt, Tt + Ts), the base station uses the ith beam to supplement the transmission of the SSBi, and the terminal receives the SSBi; and in the time period of (Tt + Ts, Tt +2 × Ts), the base station uses the jth beam to supplement and transmit SSBj, and the terminal receives the SSBj until all SSBs in the set SO are received.
Optionally, in this embodiment of the present invention, the synchronization signal block includes a broadcast channel signal;
after the step of receiving the target synchronization signal block of the directional antenna beam corresponding to the target channel and complementarily transmitted by the base station, the method further comprises:
extracting a scrambling code in the broadcast channel signal of the target synchronization signal block, and determining the sequence of the corresponding time slot of the target synchronization signal block according to the scrambling code.
In this step, in order to avoid ambiguity of the time position of the target SSB in the identification set SO of the UE, and when it cannot be determined whether the target SSB is at the normal position or the supplemental transmission position, for these target SSBs, the base station attaches a scrambling code on the PBCH signal in a scrambling code manner, where the scrambling code is used to indicate the order of the time slots corresponding to the target SSB, that is, the sequence number information of the element in the SO.
Meanwhile, in order to not occupy the system information resource of PBCH, the base station uses a group of ordered scrambling code groups { SCk } (1 ≦ k ≦ M) containing M scrambling codes to carry the scrambling codes, and the kth element (target SSB) in the set SO uses the kth scrambling code SCk to scramble PBCH information. In particular, the construction of the scrambling codes may employ known sequences having good auto-and cross-correlation properties, such as gold sequences and the like.
After receiving the target SSB, the terminal extracts the scrambling code in the PBCH of the target SSB, and determines the sequence of the corresponding time slot of the target synchronization signal block according to the scrambling code so as to determine the time position of the target SSB.
Specifically, in the cell search synchronization process, the terminal firstly captures and tracks the SSB by a matching correlation method, and can acquire the sequence number information of the synchronization signal block according to the system information carried by the PBCH signal in the SSB; in addition, whether the synchronization signal block is transmitted at a normal position or a supplementary position can be confirmed through a scrambling code attached to the PBCH, if the synchronization signal block is transmitted at the normal position or the supplementary position, the specific information of the supplementary transmission position can be obtained according to the scrambling code, and the terminal can further judge the relative position of the received SSB in the synchronization sequence number block sequence according to the specific information so as to realize time slot synchronization and frame synchronization.
In the above embodiment of the present invention, the non-target synchronization signal block transmitted by the base station is received in the preset transmission period; receiving a target synchronization signal block of a directional antenna beam corresponding to a target channel, which is additionally transmitted by the base station, after the preset transmission period is finished; the target channel is an occupied channel in the preset transmission period; the embodiment of the invention is based on the synchronous signal block and the beam scanning technology, adopts the directional detection and the complementary receiving method, enables the gNB to transmit the synchronous signal with lower collision probability and higher efficiency, and shortens the time required by the initial access of the UE. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
The synchronization signal access method provided by the embodiment of the present invention is described above, and a base station and a terminal provided by the embodiment of the present invention are described below with reference to the accompanying drawings.
Referring to fig. 8, an embodiment of the present invention provides a base station, where the base station includes:
a monitoring module 801, configured to monitor an occupation state of a channel of the base station in a preset monitoring period.
Based on LBT, the availability of the channel in the unlicensed frequency band cannot be guaranteed at any time, so LBT requires monitoring the channel before transmitting data, performing idle channel assessment, and performing data transmission under the condition that the channel is guaranteed to be idle, and therefore, in a preset monitoring period, monitoring the occupied state of the channel of the base station, wherein the occupied state includes occupied or unoccupied.
A monitoring timer may be set for the channel, and a preset monitoring period is timed before the gNB transmits the synchronization signal, where the timing period of the monitoring timer is the duration of a single channel monitoring.
A determining module 802, configured to determine a target synchronization signal block of a directional antenna beam corresponding to an occupied target channel if it is monitored that the number of the occupied target channels meets a preset condition.
With reference to fig. 2 to 5, in the NR-U frequency band, the channel states corresponding to the L beams are monitored by using a directional detection method, and the number of target channels, that is, occupied channels, is recorded; if the number of the target channels is detected to meet the preset condition, starting a supplementary transmitting mechanism; at this time, the synchronization signal block of the beam corresponding to each target channel is recorded, the synchronization signal block is referred to as a target synchronization signal block, the target synchronization signal block is grouped into a set SO, and the number of elements in S0 is set to be NO, S0 { (SSBi, SSBj … }.
A transmitting module 803, configured to transmit a non-target synchronization signal block within a preset transmitting period, and after the preset transmitting period is ended, additionally transmit the target synchronization signal block.
After the supplementary transmitting mechanism is started, transmitting a non-target synchronous signal block, namely a synchronous signal block corresponding to a beam of which a channel is not occupied in a preset transmitting period; the preset transmission period is less than or equal to the maximum channel occupation time Tt, and the transmission time Ts of a single SSB is far less than Tt.
For example, when the preset transmission period is Tt, during the time period of (0, Tt), each non-target synchronization signal block is sequentially transmitted on the corresponding beam according to the frame format specified in the NR standard according to the preset parameter set.
After the preset transmission period is finished, complementarily transmitting a target synchronous signal block, namely complementarily transmitting the SSB of the set SO; for example, the i-th beam is used to transmit the SSBi in a time period of (Tt, Tt + Ts), the j-th beam is used to transmit the SSBj in a time period of (Tt + Ts, Tt +2 Ts), and the SSBs in the set SO are transmitted sequentially until all the SSBs in the set SO are transmitted.
Optionally, in this embodiment of the present invention, the transmitting module 803 includes:
the first transmission submodule is used for determining each time slot corresponding to the non-target synchronous signal block in a preset transmission period;
and transmitting the non-target synchronous signal block corresponding to the current time slot in each time slot.
Optionally, in this embodiment of the present invention, the transmitting module 803 includes:
and the second transmitting submodule is used for sequentially supplementing and transmitting the target synchronous signal blocks according to the sequence of the time slots corresponding to the target synchronous signal blocks after the preset transmitting period is ended.
Optionally, in this embodiment of the present invention, the synchronization signal block includes a broadcast channel signal;
the second transmitting submodule is used for:
after adding a scrambling code in the broadcast channel signal of the target synchronization signal block, complementarily transmitting the target synchronization signal block; wherein the scrambling code is used for indicating the sequence of the time slots corresponding to the target synchronization signal block.
Optionally, in this embodiment of the present invention, the preset condition is that the number of the target channels is less than or equal to a preset threshold.
In the embodiment of the present invention, based on the LBT mechanism, the monitoring module 801 monitors the occupied state of the channel of the base station in a preset monitoring period; if the determining module 802 monitors that the number of occupied target channels meets a preset condition, a complementary transmitting mechanism is started, a target synchronization signal block of a directional antenna beam corresponding to the target channel is determined, and then the transmitting module 803 transmits a non-target synchronization signal block in a preset transmitting period, and complementarily transmits the target synchronization signal block after the preset transmitting period is finished; the embodiment of the invention is based on the synchronous signal block and the beam scanning technology, adopts the directional detection and the supplementary transmission method, enables the gNB to transmit the synchronous signal with lower collision probability and higher efficiency, and shortens the time required by the initial access of the UE. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
Referring to fig. 9, an embodiment of the present invention provides a terminal, where the terminal includes:
a first receiving module 901, configured to receive a non-target synchronization signal block transmitted by a base station in a preset transmission period; the non-target synchronization signal block is a synchronization signal block corresponding to a beam of which the channel is not occupied in a preset monitoring period.
Receiving a non-target synchronous signal block transmitted by a base station in a preset transmitting period, wherein the non-target synchronous signal block is a synchronous signal block corresponding to a beam of which a channel is not occupied in the preset monitoring period; the preset transmission period is less than or equal to the maximum channel occupation time Tt, and the transmission time Ts of a single SSB is far less than Tt.
For example, when the preset transmission period is Tt, in the time period of (0, Tt), the base station sequentially transmits each non-target synchronization signal block on the corresponding beam according to the preset parameter set by using the frame format specified in the NR standard, and the terminal receives the non-target synchronization signal blocks.
A second receiving module 902, configured to receive, after the preset transmission period is ended, a target synchronization signal block of a directional antenna beam corresponding to a target channel and additionally transmitted by the base station; and the target channel is an occupied channel in the preset transmission period.
After the base station starts a supplementary transmission mechanism and a preset transmission period is finished, the terminal supplementarily receives a target synchronous signal block, namely receives the SSB of a supplementary transmission set SO; for example, in the time period of (Tt, Tt + Ts), the base station uses the ith beam to supplement the transmission of the SSBi, and the terminal receives the SSBi; and in the time period of (Tt + Ts, Tt +2 × Ts), the base station uses the jth beam to supplement and transmit SSBj, and the terminal receives the SSBj until all SSBs in the set SO are received.
Optionally, in this embodiment of the present invention, the synchronization signal block includes a broadcast channel signal;
after the step of receiving the target synchronization signal block of the directional antenna beam corresponding to the target channel and complementarily transmitted by the base station, the method further comprises:
extracting a scrambling code in the broadcast channel signal of the target synchronization signal block, and determining the sequence of the corresponding time slot of the target synchronization signal block according to the scrambling code.
In the above embodiments of the present invention, the first receiving module 901 receives a non-target synchronization signal block transmitted by a base station in a preset transmission period; after the preset transmission period is finished, the second receiving module 902 receives a target synchronization signal block of a directional antenna beam corresponding to a target channel, which is complementarily transmitted by the base station; the target channel is an occupied channel in the preset transmission period; the embodiment of the invention is based on the synchronous signal block and the beam scanning technology, adopts the directional detection and the complementary receiving method, enables the gNB to transmit the synchronous signal with lower collision probability and higher efficiency, and shortens the time required by the initial access of the UE. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
Fig. 10 is a schematic structural diagram of an electronic device according to yet another embodiment of the present invention.
Referring to fig. 10, an electronic device provided by the embodiment of the present invention includes a memory (memory)1001, a processor (processor)1002, a bus 1003, and a computer program stored in the memory 1001 and running on the processor. The memory 1001 and the processor 1002 complete communication with each other through the bus 1003.
The processor 1002 is configured to call the program instructions in the memory 1001 to implement the method according to the above embodiment of the present invention when executing the program.
In another embodiment, the processor, when executing the program, implements the method of:
monitoring the occupation state of a channel of the base station in a preset monitoring period;
if the number of occupied target channels is monitored to meet a preset condition, determining a target synchronization signal block of a directional antenna beam corresponding to the target channels;
and transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block.
The electronic device provided in the embodiment of the present invention may be configured to execute a program corresponding to the method in the foregoing method embodiment, and details of this implementation are not described again.
The electronic device provided by the embodiment of the invention monitors the occupation state of the channel of the base station in a preset monitoring period based on an LBT mechanism; if the number of occupied target channels is monitored to meet a preset condition, starting a supplementary transmitting mechanism, determining a target synchronous signal block of a directional antenna beam corresponding to the target channels, transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block; the embodiment of the invention is based on the synchronous signal block and the beam scanning technology, adopts the directional detection and the supplementary transmission method, enables the gNB to transmit the synchronous signal with lower collision probability and higher efficiency, and shortens the time required by the initial access of the UE. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
A further embodiment of the invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps in the method as provided in the above-described embodiments of the invention.
In another embodiment, the program when executed by a processor implements a method comprising:
monitoring the occupation state of a channel of the base station in a preset monitoring period;
if the number of occupied target channels is monitored to meet a preset condition, determining a target synchronization signal block of a directional antenna beam corresponding to the target channels;
and transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block.
In the non-transitory computer-readable storage medium provided in the embodiment of the present invention, when the program is executed by the processor, the method in the above-described method embodiment is implemented, and details of this implementation are not described again.
The non-transitory computer readable storage medium provided in the embodiment of the present invention monitors an occupied state of a channel of the base station in a preset monitoring period based on an LBT mechanism; if the number of occupied target channels is monitored to meet a preset condition, starting a supplementary transmitting mechanism, determining a target synchronous signal block of a directional antenna beam corresponding to the target channels, transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block; the embodiment of the invention is based on the synchronous signal block and the beam scanning technology, adopts the directional detection and the supplementary transmission method, enables the gNB to transmit the synchronous signal with lower collision probability and higher efficiency, and shortens the time required by the initial access of the UE. The embodiment of the invention realizes the use of the NR-U frequency band so as to meet the higher requirement of a 5G communication network on the available frequency band.
Yet another embodiment of the present invention discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example comprising:
monitoring the occupation state of a channel of the base station in a preset monitoring period;
if the number of occupied target channels is monitored to meet a preset condition, determining a target synchronization signal block of a directional antenna beam corresponding to the target channels;
and transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A synchronization signal access method applied to a base station is characterized in that the method comprises the following steps:
monitoring the occupation state of a channel of the base station in a preset monitoring period;
if the number of occupied target channels is monitored to meet a preset condition, determining a target synchronization signal block of a directional antenna beam corresponding to the target channels;
and transmitting a non-target synchronous signal block in a preset transmitting period, and after the preset transmitting period is finished, complementarily transmitting the target synchronous signal block.
2. The method of claim 1, wherein the step of transmitting the non-target synchronization signal block in the preset transmission period comprises:
determining each time slot corresponding to the non-target synchronization signal block in a preset transmitting period;
and transmitting the non-target synchronous signal block corresponding to the current time slot in each time slot.
3. The method of claim 1, wherein the step of transmitting the target synchronization signal block after the preset transmission period is over comprises:
and after the preset transmitting period is finished, sequentially supplementing and transmitting the target synchronous signal blocks according to the sequence of the time slots corresponding to the target synchronous signal blocks.
4. The method of claim 3, wherein the synchronization signal block comprises a broadcast channel signal;
the step of supplementary transmitting the target synchronization signal block includes:
after adding a scrambling code in the broadcast channel signal of the target synchronization signal block, complementarily transmitting the target synchronization signal block; wherein the scrambling code is used for indicating the sequence of the time slots corresponding to the target synchronization signal block.
5. The method of claim 1, wherein the predetermined condition is that the number of target channels is less than or equal to a predetermined threshold.
6. A synchronization signal access method is applied to a terminal, and is characterized in that the method comprises the following steps:
receiving a non-target synchronous signal block transmitted by a base station in a preset transmission period; the non-target synchronous signal block is a synchronous signal block corresponding to a wave beam of which the channel is not occupied in a preset monitoring period;
after the preset transmitting period is finished, receiving a target synchronous signal block of a directional antenna beam corresponding to a target channel, which is additionally transmitted by the base station; and the target channel is an occupied channel in the preset transmission period.
7. The method of claim 6, wherein the synchronization signal block comprises a broadcast channel signal;
after the step of receiving the target synchronization signal block of the directional antenna beam corresponding to the target channel and complementarily transmitted by the base station, the method further comprises:
extracting a scrambling code in the broadcast channel signal of the target synchronization signal block, and determining the sequence of the corresponding time slot of the target synchronization signal block according to the scrambling code.
8. A base station, characterized in that the base station comprises:
the monitoring module is used for monitoring the occupation state of the channel of the base station in a preset monitoring period;
the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a target synchronization signal block of a directional antenna beam corresponding to an occupied target channel if the number of the occupied target channel is monitored to meet a preset condition;
and the transmitting module is used for transmitting a non-target synchronous signal block in a preset transmitting period and complementarily transmitting the target synchronous signal block after the preset transmitting period is finished.
9. A terminal, characterized in that the terminal comprises:
the first receiving module is used for receiving a non-target synchronization signal block transmitted by a base station in a preset transmitting period; the non-target synchronous signal block is a synchronous signal block corresponding to a wave beam of which the channel is not occupied in a preset monitoring period;
a second receiving module, configured to receive, after the preset transmission period is ended, a target synchronization signal block of a directional antenna beam corresponding to a target channel, where the target synchronization signal block is complementarily transmitted by the base station; and the target channel is an occupied channel in the preset transmission period.
10. An electronic device, comprising a memory, a processor, a bus, and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the synchronization signal access method according to any one of claims 1 to 7 when executing the program.
11. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that: the program, when executed by a processor, implements the steps in the synchronization signal access method of any one of claims 1 to 7.
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| CN111669240A (en) * | 2020-05-15 | 2020-09-15 | 中国信息通信研究院 | Method, device and system for supporting directional listen-before-send transmission |
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