CN111901807A - Method and device for transmitting synchronous signal on unlicensed spectrum - Google Patents
Method and device for transmitting synchronous signal on unlicensed spectrum Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for transmitting synchronous signals on an unauthorized frequency spectrum. The method comprises the following steps: determining a first target synchronous signal block set according to the occupation state of a channel corresponding to the directional beam, wherein the first target synchronous signal block set is a synchronous signal block set corresponding to the occupied channel; judging whether the number of elements in the first target synchronization signal block set is greater than a first threshold value at the starting moment of the current frame in the monitoring period; when the synchronization signal block set is not larger than the first threshold value, determining a second synchronization signal block set, wherein the second synchronization signal block set is a synchronization signal block set which is moved out of the first target synchronization signal block set and has missed the original transmission time interval; and when transmitting the non-target synchronous signal block, performing complementary transmission on the synchronous signal block in the second synchronous signal block set. The embodiment of the invention can improve the efficiency of transmitting the synchronous signal block and reduce the transmission delay of the synchronous signal block.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a synchronization signal on an unlicensed spectrum.
Background
In order to meet the higher demand of the available frequency band of the future 5G communication network, based on the use of the conventional licensed spectrum, by means of technologies such as massive antennas, high frequency communication, beam forming and the like in the 5G network, the 3GPP organization has confirmed that an Unlicensed spectrum (NR-U), such as Bands below 7GHz, 7-52.6GHz and above 52.6GHz, will be used in the 5G network, so as to make up the scarcity of the licensed spectrum and improve the transmission efficiency and the coverage.
The use of NR-U communications with 5G networks is still under investigation. Compared with the 4G network, due to the introduction of New technologies and concepts such as a synchronization signal block, beam scanning, a partial bandwidth and the like in 5G, the initial access, random access and beam management of a 5G NR (5Generation New RAT, 5G New radio access technology) channel are greatly changed. Further, the usage of the unlicensed spectrum also needs to meet the requirements on the maximum occupied channel bandwidth, the maximum occupied channel time, and the like, and especially needs to consider the influence of a Listen Before Talk (Listen Before Talk, LBT) mechanism on the initial access. The current research on initial access based on the NR-U frequency band is still in a starting stage, and no access method and conclusion specified by a protocol exist.
Disclosure of Invention
In order to solve the problem of the prior art, embodiments of the present invention provide a method and an apparatus for transmitting a synchronization signal on an unlicensed spectrum.
The embodiment of the invention provides a synchronous signal transmission method on an unauthorized frequency spectrum, which is applied to a base station and comprises the following steps: monitoring the occupation state of channels corresponding to directional beams uniformly distributed in the horizontal direction of an airspace in a preset monitoring period, wherein each directional beam corresponds to one synchronous signal block, and each synchronous signal block uses the corresponding directional beam for transmission; the method further comprises the following steps:
determining a first target synchronous signal block set according to the occupation state of a channel corresponding to the directional beam, wherein the first target synchronous signal block set is a synchronous signal block set corresponding to the occupied channel;
judging whether the number of elements in the first target synchronization signal block set is greater than a first threshold value at the starting moment of the current frame in the monitoring period;
when the synchronization signal block set is not larger than the first threshold value, determining a second synchronization signal block set, wherein the second synchronization signal block set is a synchronization signal block set which is moved out of the first target synchronization signal block set and has missed the original transmission time interval;
and when transmitting a non-target synchronous signal block, performing complementary transmission on the synchronous signal block in the second synchronous signal block set, wherein the non-target synchronous signal block is a synchronous signal block which does not belong to the first target synchronous signal block set or the second target synchronous signal block set.
The embodiment of the invention provides a method for transmitting a synchronous signal on an unauthorized frequency spectrum, which is applied to a terminal and further comprises the following steps:
receiving a non-target synchronous signal block sent by a base station in a synchronous signal transmission window, wherein the non-target synchronous signal block is a synchronous signal block of which a corresponding channel is not occupied in a preset monitoring period;
and receiving a synchronous signal block which is sent by the base station again in a synchronous signal transmission window, wherein the synchronous signal block which is sent again is a signal block which misses the original transmission time period when the corresponding channel is unoccupied.
The embodiment of the invention provides a synchronous signal transmission device on an unauthorized frequency spectrum, which is applied to a base station and comprises the following components: the monitoring unit is used for monitoring the occupation state of channels corresponding to the directional beams which are uniformly distributed in the horizontal direction of an airspace in a preset monitoring period, wherein each directional beam corresponds to one synchronous signal block, and each synchronous signal block is transmitted by using the corresponding directional beam; the device further comprises:
a first determining unit, configured to determine a first target synchronization signal block set according to an occupied state of a channel corresponding to a directional beam, where the first target synchronization signal block set is a synchronization signal block set corresponding to an occupied channel;
a determining unit, configured to determine whether the number of elements in the first target synchronization signal block set is greater than a first threshold at a starting time of a current frame in the monitoring period;
a second determining unit, configured to determine, when not greater than a first threshold, a second synchronization signal block set, where the second synchronization signal block set is a synchronization signal block set that is shifted out from the first target synchronization signal block set and has missed an original transmission period;
and the retransmission unit is used for retransmitting the synchronous signal blocks in the second synchronous signal block set when transmitting the non-target synchronous signal blocks, wherein the non-target synchronous signal blocks are synchronous signal blocks which do not belong to the first target synchronous signal block set and the second target synchronous signal block set.
The embodiment of the invention provides a synchronous signal transmission device on an unauthorized frequency spectrum, which is applied to a terminal and comprises:
the device comprises a first receiving unit, a second receiving unit and a third receiving unit, wherein the first receiving unit is used for receiving a non-target synchronous signal block sent by a base station in a synchronous signal transmission window, and the non-target synchronous signal block is a synchronous signal block of which a corresponding channel is not occupied in a preset monitoring period;
and the second receiving unit is used for receiving a synchronous signal block which is sent by the base station in a supplementing way in the synchronous signal transmission window, wherein the supplemented synchronous signal block is a signal block which misses the original transmission time period when the corresponding channel is unoccupied.
The embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the method for transmitting the synchronization signal over the unlicensed spectrum.
Embodiments of the present invention also provide 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 above-mentioned method for transmitting a synchronization signal over an unlicensed spectrum.
According to the method and the device for transmitting the synchronous signal on the unlicensed spectrum, provided by the embodiment of the invention, the synchronous signal blocks which are not occupied by the corresponding channel are transmitted in the same transmitting window, and meanwhile, the synchronous signal blocks which miss the original transmitting time period when the channel is unoccupied due to the occupied channel are supplemented, so that the efficiency of transmitting the synchronous signal blocks can be effectively improved, and the transmission delay of the synchronous signal blocks is reduced.
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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 method for transmitting a synchronization signal over an unlicensed spectrum 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 an embodiment of the present invention;
FIG. 4 is a diagram illustrating a time-frequency structure of a synchronization signal block according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the transmission of a synchronization signal block in a transmission window according to an embodiment of the present invention;
FIG. 6 is a diagram of a synchronization signal block with occupied non-transmission channels according to an embodiment of the present invention;
FIG. 7 is a diagram of a supplemental transmit synchronization signal block according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a method for transmitting a synchronization signal over an unlicensed spectrum according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a synchronization signal transmission apparatus over an unlicensed spectrum according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a synchronization signal transmission apparatus over an unlicensed spectrum according to an embodiment of the present invention;
fig. 11 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 is a flowchart illustrating a method for transmitting a synchronization signal over an unlicensed spectrum according to an embodiment of the present invention.
Before explaining the present invention in detail, the following is first introduced.
Based on Massive MIMO and beamforming technology, L beamforming matrixes are configured for a 5G base station (gNB) end in a communication scene using an NR-U unlicensed frequency band (unlicensed spectrum), and the L beamforming matrixes are respectively W beamforming matrixes1，…，WLAnd each beam forming matrix corresponds to one directional antenna beam, 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.
In the configuration process, the L directional antenna beams have the same beam shape but different directions, are uniformly distributed in the horizontal direction of the airspace of the base station gNB, 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 The L synchronization signal blocks correspond to the L beams one to one, and each synchronization signal block is transmitted through the beam corresponding to the synchronization signal block, and is used for a User Equipment (UE) or a terminal to acquire air interface information and establish a connection with the gNB.
Fig. 3 shows a schematic diagram of the beam directions of the antenna array in polar coordinates, with the horizontal coverage of the gNB in fig. 3The cover angle is 360 degrees for example, two beams SS are shown1、SS2Main lobe diagram of (1), two beams SS1、SS2Respectively formed by a forming matrix W1、W2And (4) generating.
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. SSB1，…，SSBLCorresponding to the L beams, respectively.
Referring to fig. 5, SSburst1 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 changes sequentially.
The method for transmitting the synchronous signal on the unauthorized frequency spectrum, which is provided by the embodiment of the invention, is applied to a base station and comprises the following steps: in a preset monitoring period, monitoring an occupied state of a channel corresponding to directional beams uniformly distributed in the horizontal direction of an airspace, where each directional beam corresponds to one synchronization signal block, and each synchronization signal block uses the corresponding directional beam for transmission, as shown in fig. 1, the method further includes the following steps:
s11, determining a first target synchronization signal block set according to the occupation state of the channel corresponding to the directional beam, wherein the first target synchronization signal block set is the synchronization signal block set corresponding to the occupied channel;
specifically, based on a Listen and avoid mechanism (Listen Before Talk, LBT), the availability of the channel in the unlicensed 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 again under the condition that the channel is ensured to be idle.
And setting a monitoring time length and a maximum channel occupation time length (the SSB time length of each synchronous signal block is far less than the maximum channel occupation time length). Base station transmitting synchronous signalSetting a channel monitoring timer, monitoring the channel states corresponding to the L beams in a directional detection mode on the used NR-U frequency band, and recording the synchronous signal blocks corresponding to the occupied channels, wherein the signal blocks form a set SO ═ { SSB ═ SSBi、SSBj…, the number of elements in SO is N0。
S12, determining whether the number of elements in the first target synchronization signal block set is greater than a first threshold at the starting time of the current frame in the listening period;
specifically, at the initial position of a certain radio frame, if the reading of the monitoring timer is less than the preset monitoring duration, that is, within the monitoring period, the number N of elements in the first target synchronization signal block set is determined0Whether the value is larger than a preset parameter N.
S13, when the value is not larger than the first threshold value, determining a second synchronization signal block set, wherein the second synchronization signal block set is a synchronization signal block set which is moved out from the first target synchronization signal block set and has missed the original transmission time interval;
specifically, if the listening timer reading is less than the preset listening duration, i.e. within the listening period, and the number N of elements in the first target synchronization signal block set0If the signal block is not greater than the preset parameter N, the gNB starts from the infinite frame starting position, keeps monitoring the beam direction corresponding to each element in the SO in a synchronous signal block transmitting window (the transmitting time of the synchronous signal block transmitting window is aligned with the infinite frame transmitting time), continuously updates the SO according to the monitoring result, and if the signal block removed from the SO misses the original transmitting time period, forms a set SF { SSB (single sign B) } by the signal blockk、SSBl…}。
And S14, when transmitting the non-target synchronous signal blocks, performing complementary transmission on the synchronous signal blocks in the second synchronous signal block set, wherein the non-target synchronous signal blocks are synchronous signal blocks which do not belong to the first target synchronous signal block set and the second target synchronous signal block set.
Specifically, if the reading of the monitoring timer is less than the preset monitoring duration, i.e. in the monitoring period, and the second timeNumber of elements N in a target synchronization signal block set0Not greater than the preset parameter N, while the base station updates the set SO, on the other hand, from the start position of the infinite frame, the base station sequentially transmits the synchronization signal blocks on the corresponding beams according to the specific parameter set by using the frame format specified in the NR standard, where the transmitted synchronization signal block refers to a synchronization signal block whose corresponding channel is not occupied in the preset listening period, and does not belong to either the set SO or the set SF.
And in the process of sequentially transmitting each synchronous signal block on the corresponding beam, if the signal block to be transmitted belongs to the set SO, the signal block is not transmitted. For example if SSBiBelongs to SO, then the gNB remains silent in the beam i direction for the corresponding period.
In preparation for transmitting a certain signal block SSBm(SSBmNot belonging to set SO), simultaneously judging whether SF is an empty set, if SO, normally transmitting SSBm(ii) a If the SF is not empty, then the SSB is sentmMeanwhile, the synchronous signal blocks in the SF are sent in a complementary mode, so that the synchronous signal blocks in the SF set are prevented from always obtaining the next transmission window. For example, the gNB uses X (X) simultaneously through a large-scale antenna array>1) Beam transmitting X signal blocks SSBmAnd SSBk、SSBl… (wherein signal SSBmFor normal transmission, i.e. SSBmNot belonging to the set SO or SF, but the other X-1 signal blocks SSBk、SSBl… belong to the SF as a supplemental transmission), while updating the set SF, and so on, until all signal blocks are transmitted.
Taking X ═ 2 as an example, fig. 6 shows a schematic diagram given that in the case where the signal block to be transmitted belongs to the set SO, no transmission is performed. As shown in FIG. 6, the current time SSBiBelongs to SO and has an empty SF, and since the channel in the direction of beam i is occupied, the SSBiFailing to transmit during its regular time period.
Taking X as an example, fig. 7 shows a schematic diagram of performing supplementary transmission on a synchronization signal block in SF when SF is not null. As shown in FIG. 7, the current time SSBmNot belonging to SO or SF, and SSBiBelonging to SF, in transmitting SSBmIn a time interval of (1), two parallel beams are adopted for simultaneous transmissionJet SSBmAnd SSBiTransmitting SSBmBelonging to normal transmission, transmitting SSBiBelonging to supplementary emission.
Compared with a conventional single-beam scanning transmission mode, the embodiment of the invention provides a complementary transmission window corresponding to a signal block for an occupied beam direction on all synchronous signal block transmission windows with the maximum duration of 4 ms.
According to the method for transmitting the synchronous signal on the unlicensed spectrum, provided by the embodiment of the invention, the synchronous signal blocks which are missed in the original transmission time period when the channels are unoccupied due to the occupation of the channels are transmitted in the same transmission window, so that the efficiency of transmitting the synchronous signal blocks can be effectively improved, and the transmission delay of the synchronous signal blocks is reduced.
On the basis of the above embodiment, the method further includes:
and when the current frame is not greater than the first threshold value, transmitting the non-target synchronous signal blocks on the corresponding directional beams in sequence at the current frame.
Specifically, if the listening timer reading is less than the preset listening duration, i.e. within the listening period, and the number N of elements in the first target synchronization signal block set0Not greater than the preset parameter N, while the base station updates the set SO, on the other hand, from the start position of the infinite frame, the base station sequentially transmits the synchronization signal blocks on the corresponding beams according to the specific parameter set by using the frame format specified in the NR standard, where the transmitted synchronization signal block refers to a synchronization signal block whose corresponding channel is not occupied in the preset listening period, and does not belong to either the set SO or the set SF.
On the basis of the above embodiment, the method further includes:
and when the channel state of the directional beam corresponding to the element in the first target synchronization signal block set is not larger than a first threshold value, continuously monitoring the channel state of the directional beam corresponding to the element in the first target synchronization signal block set, and updating the first target synchronization signal block set according to a monitoring result.
Specifically, if the listening timer reading is less than the preset listening duration, i.e. within the listening period, and the number N of elements in the first target synchronization signal block set0If the parameter is not greater than the preset parameter N, the gNB continues to monitor the beam direction corresponding to each element in the SO from the start position of the infinite frame within the synchronization signal block transmission window (the transmission time of the synchronization signal block transmission window is aligned with the transmission time of the infinite frame), and continuously updates the SO according to the monitoring result.
On the basis of the above embodiment, the method further includes:
and when the value is larger than the first threshold value, continuing to keep monitoring and waiting for the next wireless frame to transmit the synchronous signal block.
Specifically, the first target synchronization signal block set is determined at the starting position of a certain radio frame, and if the reading of the monitoring timer is smaller than the preset monitoring duration, that is, within the monitoring period, the number N of elements in the first target synchronization signal block set0If the parameter N is greater than the preset parameter N, the gNB continues to monitor for the synchronization signal to be transmitted in the next radio frame.
On the basis of the above embodiment, the method further includes:
muting synchronization signal blocks of the first set of target synchronization signal blocks while transmitting non-target synchronization signal blocks.
Specifically, as shown in fig. 6, if the signal block to be transmitted belongs to the set SO, no transmission is performed, for example, assuming SSBiBelongs to SO, then the gNB remains silent in the beam i direction for the corresponding period.
On the basis of the foregoing embodiment, the performing complementary transmission on the synchronization signal blocks in the second synchronization signal block set includes:
and adding a scrambling code to the complementarily transmitted synchronous signal block, wherein the scrambling code is used for indicating the delay time of the complementarily transmitted synchronous signal block.
In particular, to avoid the UE being identifiedThe time domain position of the step signal is fuzzy, the synchronous signal block can not be determined to be at the conventional position or the transmission position, simultaneously the system information resource of the PBCH is not occupied, the delay indication information is attached to the PBCH signal by adopting a scrambling code mode aiming at the provided delay transmission initial access mode, namely, a group of ordered scrambling code groups { SC) containing L-1 scrambling codes is introducedi}(0<i<L) indicating the delay duration of a certain complementary synchronization signal block, corresponding to the use of the ith scrambling code SCiThe PBCH information of the corresponding complementary signaling block is scrambled. The construction of a particular scrambling code may employ known sequences, such as gold sequences and the like, which have good autocorrelation and no correlation properties.
Fig. 8 is a flowchart illustrating a method for transmitting a synchronization signal on an unlicensed spectrum according to an embodiment of the present invention, which is applied to a terminal, and as shown in fig. 8, the method includes the following steps:
s21, receiving a non-target synchronous signal block sent by a base station in a synchronous signal transmission window, wherein the non-target synchronous signal block is a synchronous signal block of which a corresponding channel is not occupied in a preset monitoring period;
specifically, a non-target synchronization signal block transmitted by a base station is received, wherein the non-target synchronization signal block is a synchronization signal block corresponding to a beam of which a channel is not occupied in a preset monitoring period; and the transmission time length of the single SSB is far less than the maximum channel occupation time.
For example, the base station sequentially transmits each non-target synchronization signal block on a corresponding beam according to a preset parameter set by using a frame format specified in the NR standard, and the terminal receives the non-target synchronization signal blocks.
And S22, receiving a synchronization signal block which is sent by the base station in a complementary manner in the synchronization signal transmission window, wherein the complementary synchronization signal block is a signal block which misses the original transmission time period when the corresponding channel is unoccupied.
Specifically, while receiving the non-target synchronization signal block transmitted by the base station, receiving the synchronization signal block missed in the transmission period due to the channel occupation, which is simultaneously retransmitted by the base station.
On the basis of the above embodiment, after S22, the method further includes:
and determining the relative position of the synchronous signal block in a transmission window of the complete synchronous signal block according to the scrambling code carried by the synchronous signal block.
Specifically, in the cell search synchronization process, the UE first captures and tracks the synchronization signal block 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 synchronization signal block, and can further determine the relative position of the received signal block in the transmission window of the complete synchronization signal block by using the scrambling code attached to the PBCH signal to obtain the delay, so as to finally achieve the acquisition of the complete information of the synchronization signal block and the slot synchronization and frame synchronization.
Fig. 9 is a schematic structural diagram illustrating a synchronization signal transmission apparatus on an unlicensed spectrum according to an embodiment of the present invention. The device is applied to the base station and comprises the following components: the monitoring unit is used for monitoring the occupation state of channels corresponding to the directional beams which are uniformly distributed in the horizontal direction of an airspace in a preset monitoring period, wherein each directional beam corresponds to one synchronous signal block, and each synchronous signal block is transmitted by using the corresponding directional beam; as shown in fig. 9, the apparatus further includes: a first determining unit 11, a judging unit 12, a second determining unit 13 and a complementary sending unit 14, wherein:
the first determining unit 11 is configured to determine a first target synchronization signal block set according to an occupied state of a channel corresponding to a directional beam, where the first target synchronization signal block set is a synchronization signal block set corresponding to an occupied channel;
specifically, a listening duration and a maximum channel occupancy duration (the SSB duration per synchronization signal block is much smaller than the maximum channel occupancy duration) are set. Before transmitting the synchronous signal, the base station sets a channel monitoring timer, monitors the channel state corresponding to the L wave beams in the used NR-U frequency band by adopting a directional detection mode, and records the synchronous signal blocks corresponding to the occupied channels, wherein the signal blocks form a set SO ═ { SSB ═ SSBi、SSBj…, the number of elements in SO is N0。
The determining unit 12 is configured to determine whether the number of elements in the first target synchronization signal block set at the starting time of the current frame is greater than a first threshold in the monitoring period;
specifically, at the initial position of a certain radio frame, if the reading of the monitoring timer is less than the preset monitoring duration, that is, within the monitoring period, the number N of elements in the first target synchronization signal block set is determined0Whether the value is larger than a preset parameter N.
The second determining unit 13 is configured to determine, when the number of synchronization signal blocks is not greater than a first threshold, a second synchronization signal block set, where the second synchronization signal block set is a synchronization signal block set that is shifted from the first target synchronization signal block set and has missed an original transmission period;
specifically, if the listening timer reading is less than the preset listening duration, i.e. within the listening period, and the number N of elements in the first target synchronization signal block set0If the signal block is not greater than the preset parameter N, the gNB starts from the infinite frame starting position, keeps monitoring the beam direction corresponding to each element in the SO in a synchronous signal block transmitting window (the transmitting time of the synchronous signal block transmitting window is aligned with the infinite frame transmitting time), continuously updates the SO according to the monitoring result, and if the signal block removed from the SO misses the original transmitting time period, forms a set SF { SSB (single sign B) } by the signal blockk、SSBl…}。
The complementary transmitting unit 14 is configured to perform complementary transmission on the synchronization signal blocks in the second synchronization signal block set when transmitting non-target synchronization signal blocks, where the non-target synchronization signal blocks are synchronization signal blocks that do not belong to the first target synchronization signal block set or the second target synchronization signal block set.
Specifically, if the listening timer reading is less than the preset listening duration, i.e. within the listening period, and the number N of elements in the first target synchronization signal block set0Not greater than a preset parameter N, the base station, while updating the set SO, on the other hand, starts from the start of an infinite frame, and transmits each synchronization signal block on the corresponding beam in sequence according to a specific parameter set using the frame format specified in the NR standardHere, the transmitted synchronization signal block refers to a synchronization signal block whose corresponding channel is not occupied in a preset monitoring period, and does not belong to the set SO or the set SF.
And in the process of sequentially transmitting each synchronous signal block on the corresponding beam, if the signal block to be transmitted belongs to the set SO, the signal block is not transmitted. For example if SSBiBelongs to SO, then the gNB remains silent in the beam i direction for the corresponding period.
In preparation for transmitting a certain signal block SSBm(SSBmNot belonging to set SO), simultaneously judging whether SF is an empty set, if SO, normally transmitting SSBm(ii) a If the SF is not empty, then the SSB is sentmMeanwhile, the synchronous signal blocks in the SF are sent in a complementary mode, so that the synchronous signal blocks in the SF set are prevented from always obtaining the next transmission window. For example, the gNB uses X (X) simultaneously through a large-scale antenna array>1) Beam transmitting X signal blocks SSBmAnd SSBk、SSBl… (wherein signal SSBmFor normal transmission, i.e. SSBmNot belonging to the set SO or SF, but the other X-1 signal blocks SSBk、SSBl… belong to the SF as a supplemental transmission), while updating the set SF, and so on, until all signal blocks are transmitted.
Taking X ═ 2 as an example, fig. 6 shows a schematic diagram given that in the case where the signal block to be transmitted belongs to the set SO, no transmission is performed. As shown in FIG. 6, the current time SSBiBelongs to SO and has an empty SF, and since the channel in the direction of beam i is occupied, the SSBiFailing to transmit during its regular time period.
Taking X as an example, fig. 7 shows a beam diagram for performing supplementary transmission on a synchronization signal block in SF when SF is not null. As shown in FIG. 7, the current time SSBmNot belonging to SO or SF, and SSBiBelonging to SF, in transmitting SSBmIn a time period of time, two parallel beams are adopted to simultaneously transmit SSBmAnd SSBiTransmitting SSBmBelonging to normal transmission, transmitting SSBiBelonging to supplementary emission.
Compared with a conventional single-beam scanning transmission mode, the embodiment of the invention provides a complementary transmission window corresponding to a signal block for an occupied beam direction on all synchronous signal block transmission windows with the maximum duration of 4 ms.
According to the synchronous signal transmission device on the unlicensed spectrum, provided by the embodiment of the invention, the synchronous signal blocks which are not occupied in the corresponding channel are transmitted in the same transmission window, and meanwhile, the synchronous signal blocks which miss the original transmission time period when the channel is unoccupied due to the occupied channel are sent again, so that the efficiency of transmitting the synchronous signal blocks can be effectively improved, and the transmission delay of the synchronous signal blocks is reduced.
On the basis of the above embodiment, the apparatus further includes:
and the sending unit is used for sequentially sending the non-target synchronization signal blocks on the corresponding directional beams in the current frame when the non-target synchronization signal blocks are not greater than the first threshold value.
On the basis of the above embodiment, the apparatus further includes:
and the updating unit is used for continuously monitoring the channel state of the directional beam corresponding to the element in the first target synchronization signal block set when the channel state is not greater than a first threshold value, and updating the first target synchronization signal block set according to a monitoring result.
On the basis of the above embodiment, the apparatus further includes:
and the first processing unit is used for continuing to keep monitoring and waiting for the next wireless frame to transmit the synchronous signal block when the first threshold value is larger than the first threshold value.
On the basis of the above embodiment, the apparatus further includes:
a second processing unit, configured to keep silent synchronization signal blocks in the first target synchronization signal block set when transmitting non-target synchronization signal blocks.
On the basis of the above embodiment, the complementary sending unit 14 is configured to add a scrambling code to the complementary-transmitted synchronization signal block, where the scrambling code is used to indicate a delay time of the complementary-transmitted synchronization signal block.
Specifically, in order to avoid the UE from recognizing the ambiguity of the time domain position of the synchronization signal, and being unable to determine whether the synchronization signal block is at the normal position or the retransmission position, and simultaneously not occupying the system information resource of the PBCH, the delay indication information is attached to the PBCH signal in a scrambling code manner for the proposed initial access mode of the delayed retransmission, that is, a group of ordered scrambling code groups { SC ] containing L-1 scrambling codes is introducedi}(0<i<L) indicating the delay duration of a certain complementary synchronization signal block, corresponding to the use of the ith scrambling code SCiThe PBCH information of the corresponding complementary signaling block is scrambled. The construction of a particular scrambling code may employ known sequences, such as gold sequences and the like, which have good autocorrelation and no correlation properties.
Fig. 10 is a schematic structural diagram illustrating a synchronization signal transmission apparatus on an unlicensed spectrum according to an embodiment of the present invention. The device is applied to the terminal and comprises: a first receiving unit 21 and a second receiving unit 22, wherein:
the first receiving unit 21 is configured to receive a non-target synchronization signal block sent by a base station in a synchronization signal transmission window, where the non-target synchronization signal block is a synchronization signal block whose corresponding channel is not occupied in a preset monitoring period;
specifically, a non-target synchronization signal block transmitted by a base station is received, wherein the non-target synchronization signal block is a synchronization signal block corresponding to a beam of which a channel is not occupied in a preset monitoring period; and the transmission time length of the single SSB is far less than the maximum channel occupation time.
For example, the base station sequentially transmits each non-target synchronization signal block on a corresponding beam according to a preset parameter set by using a frame format specified in the NR standard, and the terminal receives the non-target synchronization signal blocks.
The second receiving unit 22 is configured to receive, in the synchronization signal transmission window, a synchronization signal block that is sent back by the base station, where the synchronization signal block that is sent back is a signal block that has missed an original transmission time period when the corresponding channel is unoccupied.
Specifically, while receiving the non-target synchronization signal block transmitted by the base station, receiving the synchronization signal block missed in the transmission period due to the channel occupation, which is simultaneously retransmitted by the base station.
On the basis of the above embodiment, the apparatus further includes:
and the third determining unit is used for determining the relative position of the synchronous signal block in the transmission window of the complete synchronous signal block according to the scrambling code carried by the synchronous signal block after receiving the synchronous signal block retransmitted by the base station.
Specifically, in the cell search synchronization process, the UE first captures and tracks the synchronization signal block 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 synchronization signal block, and can further determine the relative position of the received signal block in the transmission window of the complete synchronization signal block by using the scrambling code attached to the PBCH signal to obtain the delay, so as to finally achieve the acquisition of the complete information of the synchronization signal block and the slot synchronization and frame synchronization.
Fig. 11 illustrates a physical structure diagram of a server, and as shown in fig. 11, the server may include: a processor (processor)31, a communication Interface (communication Interface)32, a memory (memory)33 and a communication bus 34, wherein the processor 31, the communication Interface 32 and the memory 33 are communicated with each other via the communication bus 34. The processor 31 may call logic instructions in the memory 33 to perform the following method:
determining a first target synchronous signal block set according to the occupation state of a channel corresponding to the directional beam, wherein the first target synchronous signal block set is a synchronous signal block set corresponding to the occupied channel;
judging whether the number of elements in the first target synchronization signal block set is greater than a first threshold value at the starting moment of the current frame in the monitoring period;
when the synchronization signal block set is not larger than the first threshold value, determining a second synchronization signal block set, wherein the second synchronization signal block set is a synchronization signal block set which is moved out of the first target synchronization signal block set and has missed the original transmission time interval;
and when transmitting a non-target synchronous signal block, performing complementary transmission on the synchronous signal block in the second synchronous signal block set, wherein the non-target synchronous signal block is a synchronous signal block which does not belong to the first target synchronous signal block set or the second target synchronous signal block set.
In addition, the logic instructions in the memory 33 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In 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 is implemented to perform the transmission method provided in the foregoing embodiments when executed by a processor, and for example, the method includes:
determining a first target synchronous signal block set according to the occupation state of a channel corresponding to the directional beam, wherein the first target synchronous signal block set is a synchronous signal block set corresponding to the occupied channel;
judging whether the number of elements in the first target synchronization signal block set is greater than a first threshold value at the starting moment of the current frame in the monitoring period;
when the synchronization signal block set is not larger than the first threshold value, determining a second synchronization signal block set, wherein the second synchronization signal block set is a synchronization signal block set which is moved out of the first target synchronization signal block set and has missed the original transmission time interval;
and when transmitting a non-target synchronous signal block, performing complementary transmission on the synchronous signal block in the second synchronous signal block set, wherein the non-target synchronous signal block is a synchronous signal block which does not belong to the first target synchronous signal block set or the second target synchronous signal block set.
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 (12)
1. A method for transmitting a synchronization signal on an unlicensed spectrum is applied to a base station, and comprises the following steps: monitoring the occupation state of channels corresponding to directional beams uniformly distributed in the horizontal direction of an airspace in a preset monitoring period, wherein each directional beam corresponds to one synchronous signal block, and each synchronous signal block uses the corresponding directional beam for transmission; characterized in that the method further comprises:
determining a first target synchronous signal block set according to the occupation state of a channel corresponding to the directional beam, wherein the first target synchronous signal block set is a synchronous signal block set corresponding to the occupied channel;
judging whether the number of elements in the first target synchronization signal block set is greater than a first threshold value at the starting moment of the current frame in the monitoring period;
when the synchronization signal block set is not larger than the first threshold value, determining a second synchronization signal block set, wherein the second synchronization signal block set is a synchronization signal block set which is moved out of the first target synchronization signal block set and has missed the original transmission time interval;
and when transmitting a non-target synchronous signal block, performing complementary transmission on the synchronous signal block in the second synchronous signal block set, wherein the non-target synchronous signal block is a synchronous signal block which does not belong to the first target synchronous signal block set or the second target synchronous signal block set.
2. The method of transmission of synchronization signals over unlicensed spectrum as claimed in claim 1, further comprising:
and when the current frame is not greater than the first threshold value, transmitting the non-target synchronous signal blocks on the corresponding directional beams in sequence at the current frame.
3. The method of transmission of synchronization signals over unlicensed spectrum as claimed in claim 1, further comprising:
and when the channel state of the directional beam corresponding to the element in the first target synchronization signal block set is not larger than a first threshold value, continuously monitoring the channel state of the directional beam corresponding to the element in the first target synchronization signal block set, and updating the first target synchronization signal block set according to a monitoring result.
4. The method of transmission of synchronization signals over unlicensed spectrum as claimed in claim 1, further comprising:
and when the value is larger than the first threshold value, continuing to keep monitoring and waiting for the next wireless frame to transmit the synchronous signal block.
5. The method of transmission of synchronization signals over unlicensed spectrum as claimed in claim 1, further comprising:
muting synchronization signal blocks of the first set of target synchronization signal blocks while transmitting non-target synchronization signal blocks.
6. The method of claim 1, wherein the complementing the synchronization signal blocks of the second set of synchronization signal blocks comprises:
and adding a scrambling code to the complementarily transmitted synchronous signal block, wherein the scrambling code is used for indicating the delay time of the complementarily transmitted synchronous signal block.
7. A method for transmitting a synchronization signal on an unlicensed spectrum, the method being applied to a terminal, the method further comprising:
receiving a non-target synchronous signal block sent by a base station in a synchronous signal transmission window, wherein the non-target synchronous signal block is a synchronous signal block of which a corresponding channel is not occupied in a preset monitoring period;
and receiving a synchronous signal block which is sent by the base station again in a synchronous signal transmission window, wherein the synchronous signal block which is sent again is a signal block which misses the original transmission time period when the corresponding channel is unoccupied.
8. The method of transmitting synchronization signals over unlicensed spectrum as claimed in claim 7, further comprising:
after receiving the synchronous signal block sent by the base station again, determining the relative position of the synchronous signal block in the transmission window of the complete synchronous signal block according to the scrambling code carried by the synchronous signal block.
9. An apparatus for transmitting synchronization signals over an unlicensed spectrum, the apparatus being applied to a base station, comprising: the monitoring unit is used for monitoring the occupation state of channels corresponding to the directional beams which are uniformly distributed in the horizontal direction of an airspace in a preset monitoring period, wherein each directional beam corresponds to one synchronous signal block, and each synchronous signal block is transmitted by using the corresponding directional beam; characterized in that the device further comprises:
a first determining unit, configured to determine a first target synchronization signal block set according to an occupied state of a channel corresponding to a directional beam, where the first target synchronization signal block set is a synchronization signal block set corresponding to an occupied channel;
a determining unit, configured to determine whether the number of elements in the first target synchronization signal block set is greater than a first threshold at a starting time of a current frame in the monitoring period;
a second determining unit, configured to determine, when not greater than a first threshold, a second synchronization signal block set, where the second synchronization signal block set is a synchronization signal block set that is shifted out from the first target synchronization signal block set and has missed an original transmission period;
and the retransmission unit is used for retransmitting the synchronous signal blocks in the second synchronous signal block set when transmitting the non-target synchronous signal blocks, wherein the non-target synchronous signal blocks are synchronous signal blocks which do not belong to the first target synchronous signal block set and the second target synchronous signal block set.
10. An apparatus for transmitting synchronization signals over an unlicensed spectrum, the apparatus being applied to a terminal, the apparatus comprising:
the device comprises a first receiving unit, a second receiving unit and a third receiving unit, wherein the first receiving unit is used for receiving a non-target synchronous signal block sent by a base station in a synchronous signal transmission window, and the non-target synchronous signal block is a synchronous signal block of which a corresponding channel is not occupied in a preset monitoring period;
and the second receiving unit is used for receiving a synchronous signal block which is sent by the base station in a supplementing way in the synchronous signal transmission window, wherein the supplemented synchronous signal block is a signal block which misses the original transmission time period when the corresponding channel is unoccupied.
11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the method for transmission of synchronization signals over unlicensed spectrum according to any of claims 1 to 8.
12. A non-transitory computer-readable storage medium, having stored thereon a computer program, which, when being executed by a processor, performs the steps of the method for transmitting synchronization signals over unlicensed spectrum according to any one of claims 1 to 8.
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| CN108496321A (en) * | 2018-04-02 | 2018-09-04 | 北京小米移动软件有限公司 | Transmit the method and device of synchronized broadcast information |
| US20190037481A1 (en) * | 2017-07-25 | 2019-01-31 | Qualcomm Incorporated | Shared spectrum synchronization design |
| CN109327897A (en) * | 2017-07-31 | 2019-02-12 | 普天信息技术有限公司 | Signal synchronizing method and device based on base station and terminal |
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| US20190037481A1 (en) * | 2017-07-25 | 2019-01-31 | Qualcomm Incorporated | Shared spectrum synchronization design |
| CN109327897A (en) * | 2017-07-31 | 2019-02-12 | 普天信息技术有限公司 | Signal synchronizing method and device based on base station and terminal |
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