CN107734633A - A kind of method and device of synchronous signal transmission - Google Patents
A kind of method and device of synchronous signal transmission Download PDFInfo
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- CN107734633A CN107734633A CN201610666557.8A CN201610666557A CN107734633A CN 107734633 A CN107734633 A CN 107734633A CN 201610666557 A CN201610666557 A CN 201610666557A CN 107734633 A CN107734633 A CN 107734633A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The invention discloses a kind of method and device of synchronous signal transmission.This method includes：Base station is sent when sending synchronizing signal according to the cycle corresponding to the synchronizing signal, and the synchronizing signal includes PSS signals and SSS signals；When the base station is to the mobile terminal transmission synchronizing signal, each synchronizing signal is sent by multiple time slots, to cause the mobile terminal to receive the synchronizing signal and complete to access, so as to realize the purpose of Synchronization Design, synchronous search and Stochastic accessing under multi-beam, the covering scene of more numerology parameters.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for transmitting a synchronous signal.
Background
At present, as the diversification of communication demands develops, the development of 5G is correspondingly challenged, and one of the challenges is higher transmission rate. In the case where the maximum downlink transmission rate is 20Gbps, a larger transmission bandwidth is one of the necessary means. The relatively idle high frequency band (up to over 100GHz) and the idle high frequency band can be exploited, so that the idle high frequency band has a great attraction and 5G is standardized for high frequency band transmission.
In order to solve the problem that a high-frequency band signal has a very large-scale loss due to a short wavelength, and the transmission distance of the signal is directly influenced, sampling a large beamforming gain to compensate for the path loss is a good choice, that is, a base station can obtain a large array gain in a certain direction through a large antenna array to improve the signal quality in the direction.
Broadcast channels also have the same characteristics, but in order to make broadcast content have the same coverage, broadcast signals also need strong array gain, but are limited by the directivity of the array, and it is now common practice to implement time-sharing full-cell coverage by polling different directions.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for transmitting a synchronization signal, and aims to solve the problems of synchronous design, synchronous search and random access under the coverage scene of multi-beam and multi-numerology parameters.
To achieve the purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a method of transmitting a synchronization signal, the method comprising:
when a base station sends a synchronous signal, the synchronous signal is sent according to a period corresponding to the synchronous signal, wherein the synchronous signal comprises a PSS signal and an SSS signal;
and when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, so that the mobile terminal receives the synchronous signals and completes access.
Preferably, the directions of the synchronization signals transmitted in each slot are different from each other.
Preferably, when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, and the method includes:
and if the number of the synchronous time slots of the base station is N, the PSS signal has M PSS sequences, each PSS sequence has K time slots, and N is equal to K.
Preferably, when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, and the method includes:
and if the number of the synchronous time slots of the base station is N, the PSS signal has MK time slots, and N is K M.
Preferably, when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, and the method includes:
if the number of the synchronous time slots of the base station is N, at least two different synchronous signal sequences are set, wherein one synchronous signal sequence is generated by adding interference to the other synchronous signal sequence, the sum of the number of the time slots in the two synchronous signal sequences is less than MK, the number of the time slot combinations of the two synchronous signal sequences is equal to MK, and N is K M.
Preferably, the sending according to the period corresponding to the synchronization signal includes:
the sending position of the PSS signal and the sending position of the SSS signal are fixed offset, and the number of the time slots of the SSS signal is equal to the supportable maximum Cell ID number.
In a second aspect, a method of transmitting a synchronization signal, the method comprising:
a mobile terminal receives a synchronous signal sent by a base station, carries out synchronous detection on the synchronous signal, and carries out PBCH detection and SIB detection according to the synchronous detection result; the synchronous detection is used for detecting a sequence sent by a base station by the mobile terminal, determining a cell ID according to the sequence, and determining frame timing according to the position of a related peak value in synchronous detection;
and the mobile terminal acquires the downlink synchronous information of the base station, selects the accessed resource according to the downlink synchronous information, and sends the selected accessed resource information to the base station to finish random access.
Preferably, the performing synchronization detection on the synchronization signal includes:
and if the time domain parameter and the frequency domain parameter of the synchronization signal meet the demodulation capability of the numerology UE with the lowest sampling rate, the synchronization detection supports different numerology UEs to access the same carrier wave, and the same synchronization signal is multiplexed.
Preferably, the time domain parameter and the frequency domain parameter of the synchronization signal satisfy a demodulation capability of a numerology UE with a lowest sampling rate, including:
the frequency domain adopts the smallest frequency domain subcarrier width corresponding to numerology UE which can be supported by the system, and the time domain is a symbol length corresponding to the smallest frequency domain subcarrier width.
Preferably, the performing PBCH detection according to the result of the synchronous detection includes:
if the PBCH signal time-frequency position and the synchronous signal time-frequency position are fixed time-frequency positions, determining the position of the PBCH signal through the PSS signal and the SSS signal;
demodulating PBCH signals according to the determined PBCH position, and reading information in the PBCH partial signals; the number of slots of PBCH is the same as the number of slots of the synchronization signal, and the transmission signal in each slot is the same, the transmission signal including: system bandwidth, frame number, and/or supportable numerology UE.
Preferably, the performing PBCH detection according to the result of the synchronous detection includes:
the mobile terminal directly detects the PBCH corresponding to the time slot S corresponding to the optimal synchronous signal; or,
and the mobile terminal performs combined detection on the N PBCHs.
Preferably, before the PBCH detection according to the result of the synchronous detection, the method further includes:
and the mobile terminal judges whether to directly detect the PBCH corresponding to the time slot S corresponding to the optimal synchronization signal or not according to the peak-to-average ratio of the synchronization signal, or carries out combined detection after combining the N PBCHs.
Preferably, the performing SIB detection according to the result of synchronization detection includes:
the mobile terminal detects downlink control signaling of a control domain to acquire an SIB message, and broadcasts downlink control signaling of different numerology UEs by using different numerology parameters when the mobile terminal supports multiple numerology parameters;
wherein the SIB message comprises RACH related parameters and different numerology usage different resource locations, and the related parameters comprise resource locations and usage sequences.
Preferably, the step of completing random access after sending the resource information selected for access to the base station includes:
the mobile terminal sends a random sequence to the base station;
after receiving the random sequence, the base station determines numerology and synchronous detection information used by the mobile terminal;
and the base station sends Random Access response to the mobile terminal according to the detected Random sequence information.
Preferably, the base station sends RandomAccess Response to the mobile terminal according to the detected random sequence information, including:
the base station acquires a corresponding optimal synchronous detection time slot according to a group number of a Random sequence, and sends RAR information according to the precoding of the optimal time slot, wherein the Random Access Response comprises a sequence index, a TA, a scheduling grant and a distributed TC RNTI detected by the base station;
the mobile terminal detects the Random Access Response to determine whether the base station is successfully detected, if so, the mobile terminal sends MSG3 to the base station, and the MSG3 comprises the ID, the type and the Qos of the mobile terminal; so that the base station sends MSG4, which contains at least the terminal ID in MSG3, to the mobile terminal after receiving the MSG3 sent by the terminal, and distributes CRNTI to the mobile terminal.
In a third aspect, an apparatus for transmitting a synchronization signal, the apparatus comprising:
the device comprises a first sending module, a second sending module and a third sending module, wherein the first sending module is used for sending a synchronization signal according to a period corresponding to the synchronization signal when sending the synchronization signal, and the synchronization signal comprises a PSS signal and an SSS signal;
and the second sending module is used for sending each synchronous signal through a plurality of time slots when sending the synchronous signal to the mobile terminal, so that the mobile terminal receives the synchronous signal and completes access.
Preferably, the directions of the synchronization signals transmitted in each slot are different from each other.
Preferably, the second sending module is specifically configured to:
and if the number of the synchronous time slots of the base station is N, the PSS signal has M PSS sequences, each PSS sequence has K time slots, and N is equal to K.
Preferably, the second sending module is specifically configured to:
and if the number of the synchronous time slots of the base station is N, the PSS signal has MK time slots, and N is K M.
Preferably, the second sending module is specifically configured to:
if the number of the synchronous time slots of the base station is N, at least two different synchronous signal sequences are set, wherein one synchronous signal sequence is generated by adding interference to the other synchronous signal sequence, the sum of the number of the time slots in the two synchronous signal sequences is less than MK, the number of the time slot combinations of the two synchronous signal sequences is equal to MK, and N is K M.
Preferably, the first sending module is specifically configured to:
the transmission positions of the PSS signals and the SSS signals are fixed offset, and the number of the time slots of the SSS signals is equal to the supportable maximum CellID number.
In a fourth aspect, an apparatus for transmitting a synchronization signal, the apparatus comprising:
a receiving module, configured to receive a synchronization signal sent by a base station;
a detection module, configured to perform synchronization detection on the synchronization signal, and perform PBCH detection and SIB detection according to a result of the synchronization detection; the synchronous detection is used for detecting a sequence sent by a base station by the mobile terminal, determining a cell ID according to the sequence, and determining frame timing according to the position of a related peak value in synchronous detection;
and the access module is used for acquiring the downlink synchronous information of the base station, selecting the accessed resource according to the downlink synchronous information, and sending the selected accessed resource information to the base station to finish random access.
Preferably, the detection module is specifically configured to:
and if the time domain parameter and the frequency domain parameter of the synchronization signal meet the demodulation capability of the numerology UE with the lowest sampling rate, the synchronization detection supports different numerology UEs to access the same carrier wave, and the same synchronization signal is multiplexed.
Preferably, the detection module is further configured to: the frequency domain adopts the smallest frequency domain subcarrier width corresponding to numerology UE which can be supported by the system, and the time domain is a symbol length corresponding to the smallest frequency domain subcarrier width.
Preferably, the detection module is specifically configured to:
if the PBCH signal time-frequency position and the synchronous signal time-frequency position are fixed time-frequency positions, determining the position of the PBCH signal through the PSS signal and the SSS signal;
demodulating PBCH signals according to the determined PBCH position, and reading information in the PBCH partial signals; the number of slots of PBCH is the same as the number of slots of the synchronization signal, and the transmission signal in each slot is the same, the transmission signal including: system bandwidth, frame number, and/or supportable numerology UE.
Preferably, the detection module is specifically configured to:
directly detecting PBCH corresponding to the time slot S corresponding to the optimal synchronous signal; or,
and combining the N PBCHs and then carrying out joint detection.
Preferably, the apparatus further comprises:
and the judging module is used for judging whether to directly detect the PBCH corresponding to the time slot S corresponding to the optimal synchronization signal or not according to the peak-to-average ratio of the synchronization signal, or carrying out combined detection after combining the N PBCHs.
Preferably, the detection module is specifically configured to:
detecting downlink control signaling of a control domain to acquire an SIB message, and broadcasting downlink control signaling of different numerology UEs using different numerology parameters when the base station supports multiple numerology parameters;
wherein the SIB message comprises RACH related parameters and different numerology usage different resource locations, and the related parameters comprise resource locations and usage sequences.
Preferably, the access module includes:
a first transmitting unit, configured to transmit a random sequence to the base station;
a determining unit, configured to determine numerology and synchronization detection information used by the mobile terminal after receiving the random sequence;
and the second sending unit is used for sending random access Response to the mobile terminal according to the detected random sequence information.
Preferably, the second sending unit is specifically configured to:
acquiring a corresponding optimal synchronous detection time slot according to a group number of a Random sequence, and sending RAR information according to precoding of the optimal time slot, wherein the Random Access Response comprises a sequence index, a TA, a scheduling grant and a distributed TC RNTI detected by the base station;
detecting the Random Access Response to determine whether the base station is successfully detected, if so, sending an MSG3 to the base station by the mobile terminal, wherein the MSG3 comprises the ID, the type and the Qos of the mobile terminal; so that the base station sends MSG4, which contains at least the terminal ID in MSG3, to the mobile terminal after receiving the MSG3 sent by the terminal, and distributes CRNTI to the mobile terminal.
The embodiment of the invention provides a method and a device for transmitting synchronous signals, wherein a base station transmits the synchronous signals according to the corresponding period of the synchronous signals when transmitting the synchronous signals, and the synchronous signals comprise PSS signals and SSS signals; and when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, so that the mobile terminal receives the synchronous signals and completes access, and the aims of synchronous design, synchronous search and random access under the coverage scene of multi-beam and multi-numerology parameters are fulfilled.
Drawings
Fig. 1 is a flowchart illustrating a method for transmitting a synchronization signal according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a synchronization signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another structure of a synchronization signal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another structure of a synchronization signal according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a synchronization signal generation according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating another method for transmitting a synchronization signal according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating synchronization detection provided by an embodiment of the present invention;
fig. 8 is a schematic diagram of beams after PBCH detection combining according to an embodiment of the present invention;
fig. 9 is a functional block diagram of an apparatus for transmitting a synchronization signal according to an embodiment of the present invention;
fig. 10 is a functional block diagram of another apparatus for transmitting a synchronization signal according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad invention. It should be further noted that, for convenience of description, only some structures, not all structures, relating to the embodiments of the present invention are shown in the drawings.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for transmitting a synchronization signal according to an embodiment of the present invention.
As shown in fig. 1, the method for transmitting the synchronization signal includes:
step 101, when a base station sends a synchronization signal, the base station sends the synchronization signal according to a period corresponding to the synchronization signal, wherein the synchronization signal comprises a PSS signal and an SSS signal;
specifically, as shown in fig. 2, fig. 2 is a schematic structural diagram of a synchronization signal according to an embodiment of the present invention. The Synchronization signals include a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), which are both transmitted at the same period T, but the PSS and the SSS are transmitted through a plurality of slots each time, and the transmission direction of each slot is different, that is, each slot transmits a different Beam.
And 102, when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, so that the mobile terminal receives and accesses the synchronous signals.
Preferably, the directions of the synchronization signals transmitted in each slot are different from each other.
Meanwhile, the directions of the synchronization signals transmitted by each time slot may be the same.
Preferably, when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, and the method includes:
and if the number of the synchronous time slots of the base station is N, the PSS signal has M PSS sequences, each PSS sequence has K time slots, and N is equal to K.
Specifically, as shown in fig. 3, fig. 3 is a schematic structural diagram of another synchronization signal provided in the embodiment of the present invention. As shown in fig. 3, there are K different PSS sequences, satisfying N ═ K × M, and different beams correspond to different directions.
The PSS signal comprises K sequence values, and both PSS1 and PSS2 contain the same K sequence values, i.e., the base station transmits M sets of signals containing K sequences, which are directed in MK directions, respectively. By configuring different relative position indications M of PSS1 and PSS2, it is possible to determine Beam index j (1 ═ j ═ K) within Beam group by PSS correlation search, j being intra-group ID, and determine M and time timing of one radio frame by relative position of two PSS, for example, the interval between two PSS may be taken from the set { d1, d2, …, dM }, if the interval is d1, M is 1, and so on. As shown in fig. 4, fig. 4 is used to illustrate different intervals in M of PSS, where T is a synchronization period, i.e. two PSS may have M interval values in one synchronization period.
Preferably, when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, and the method includes:
and if the number of the synchronous time slots of the base station is N, the PSS signal has MK time slots, and N is K M.
Specifically, however, the search window length is increased and the search delay is increased by the relative position, the number of PSS sequences can be set to be N, and the synchronous time slot position can be directly determined by the search sequence.
Preferably, when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, and the method includes:
if the number of the synchronous time slots of the base station is N, setting at least two different synchronous signal sequences, wherein one synchronous signal sequence is generated by adding interference to another synchronous signal sequence, the sum of the number of the time slots in the two synchronous signal sequences is less than MK, the number of the time slot combinations of the two synchronous signal sequences is equal to MK, each time slot is used for independently sending a beam, and the beams sent by different time slots are different, so that the condition that N is K M is met.
Specifically, the PSS1 and the PSS2 are set to be different sequences, and the generation of the PSS2 is scrambled by the information of the PSS1, and N combinations are found through proper sequence search, assuming that the number of PSS1 sequences is N1 and the number of PSS2 is N2, N1+ N2< N is satisfied, and the number of combinations (PSS1, PSS2) is equal to N, as shown in the synchronization signal generation diagram of fig. 5.
Preferably, the sending according to the period corresponding to the synchronization signal includes:
the sending position of the PSS signal and the sending position of the SSS signal are fixed offset, and the number of slots of the SSS signal is equal to a supportable maximum Cell Identification (Cell ID).
In the method for transmitting the synchronization signal provided by the embodiment of the invention, when the base station sends the synchronization signal, the base station sends the synchronization signal according to the period corresponding to the synchronization signal, wherein the synchronization signal comprises a PSS signal and an SSS signal; when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, and the directions of the synchronous signals sent by each time slot are different, so that the mobile terminal receives the synchronous signals and completes access, and the aims of synchronous design, synchronous search and random access under the coverage scene of multi-beam and multi-numerology parameters are fulfilled.
Referring to fig. 6, fig. 6 is a flowchart illustrating another method for transmitting a synchronization signal according to an embodiment of the present invention.
As shown in fig. 6, the method for transmitting the synchronization signal includes:
step 601, a mobile terminal receives a synchronization signal sent by a base station, performs synchronization detection on the synchronization signal, and performs Physical Broadcast Channel (PBCH) detection and System Information Block (SIB) detection according to a result of the synchronization detection; the synchronous detection is used for detecting a sequence sent by a base station by the mobile terminal, determining a cell ID according to the sequence, and determining frame timing according to the position of a related peak value in synchronous detection;
preferably, the performing synchronization detection on the synchronization signal includes:
and if the time domain parameter and the frequency domain parameter of the synchronization signal meet the demodulation capability of the numerology UE with the lowest sampling rate, the synchronization detection supports different numerology UEs to access the same carrier wave, and the same synchronization signal is multiplexed.
The frequency domain adopts the minimum frequency domain subcarrier width corresponding to numerology UE which can be supported by the system, and the time domain is a symbol length corresponding to the minimum frequency domain subcarrier width.
The following information is obtained after the synchronization signal detection: timing within a frame, the optimal slot position S (1< ═ S < ═ N) of the synchronization signal, and the synchronization signal reception quality, where the synchronization signal reception quality can be defined as the peak-to-average ratio Q, i.e., the ratio of the synchronization peak power to the average power, for example.
Specifically, as shown in fig. 7, fig. 7 is a schematic diagram of synchronization detection provided in an embodiment of the present invention.
Preferably, the performing PBCH detection on the synchronization signal includes:
if the PBCH signal time-frequency position and the synchronous signal time-frequency position are fixed time-frequency positions, determining the position of the PBCH signal through the PSS signal and the SSS signal;
demodulating PBCH signals according to the determined PBCH position, and reading information in the PBCH partial signals; the number of slots of PBCH is the same as the number of slots of the synchronization signal, and the transmission signal in each slot is the same, the transmission signal including: system bandwidth, frame number, and/or supportable numerology UE.
Preferably, the performing PBCH detection on the synchronization signal includes:
the mobile terminal directly detects the PBCH corresponding to the time slot S corresponding to the optimal synchronous signal; or,
and the mobile terminal performs combined detection on the N PBCHs.
Before the PBCH detection according to the result of the synchronous detection, the method further includes:
and the mobile terminal judges whether to directly detect the PBCH corresponding to the time slot S corresponding to the optimal synchronization signal or not according to the peak-to-average ratio of the synchronization signal, or carries out combined detection after combining the N PBCHs.
For example, Q > Thr, the detection is performed according to PBCH corresponding to the timeslot S corresponding to the optimal synchronization signal, otherwise, the detection is performed jointly after combining N PBCHs, and Thr is a predefined threshold value.
The mobile terminal sends the PBCH signal by polling, where the information sent by each polled beam is the same, and the frequency domain position is the same, and the number of beams obtained after PBCH detection is combined, which may be simple equal-gain combination or combination in a maximum ratio combination manner, and the PBCH signal includes: system bandwidth, frame number, and/or supportable numerology UE. For example, the system bandwidth is the maximum bandwidth supported by the current base station; the frame number is the number of the wireless frame; numerology refers to different subcarrier widths, sampling rates, etc.; the system supports different numerology, i.e. different subcarrier widths, different adoption rates, etc.; different numerology UEs refer to UEs supporting different subcarrier widths and different utilization rates.
Specifically, as shown in fig. 8, fig. 8 is a schematic diagram of beams after PBCH detection combining according to an embodiment of the present invention.
Preferably, the SIB detecting the synchronization signal includes:
the mobile terminal detects downlink control signaling of a control domain to acquire an SIB message, and broadcasts downlink control signaling of different numerology UEs by using different numerology parameters when the mobile terminal supports multiple numerology parameters;
wherein the SIB message comprises RACH related parameters and different numerology usage different resource locations, and the related parameters comprise resource locations and usage sequences.
In addition, the SIB message carries a part of the system message, and the transmission of the system message is consistent with that of the normal data, for example, one data transmission resource may be indicated by downlink control signaling for transmitting the SIB message, and the UE may determine how to read the SIB message by detecting the control signaling.
For example, if the number of numerologies supported by the base station is X, the base station sets X Random Access (RACH) resource pools for access by UEs of different numerologies, each resource pool includes Y sequences, although the number of sequences in each resource pool may be different, so that UEs of the same numerology may access by selecting different sequences.
Therefore, the SIB message needs to indicate the time-frequency positions of the X resource pools and the sequence set under each resource pool.
Step 602, the mobile terminal obtains downlink synchronization information of the base station, selects an access resource according to the downlink synchronization information, and sends the selected access resource information to the base station to complete random access.
Preferably, the step of completing random access after sending the resource information selected for access to the base station includes:
the mobile terminal sends a random sequence to the base station;
after receiving the random sequence, the base station determines numerology and synchronous detection information used by the mobile terminal;
and the base station sends a random access Response (random access Response) to the mobile terminal according to the detected random sequence information.
Preferably, the base station sends RandomAccess Response to the mobile terminal according to the detected random sequence information, including:
the base station acquires a corresponding optimal synchronous detection Time slot according to a group number of a Random sequence, and sends RAR information according to precoding of the optimal Time slot, wherein the Random Access Response comprises a sequence number (index), a Timing Advance (TA), a scheduling grant (scheduling grant) and an allocated temporary Cell radio network temporary representation identifier (TC RNTI) detected by the base station;
the mobile terminal detects the Random Access Response to determine whether the base station is successfully detected, if so, the mobile terminal sends MSG3 to the base station, where the MSG3 includes an ID of the mobile terminal, a mobile terminal type, and a service priority (Quality of service), so that after receiving the MSG3 sent by the terminal, the base station sends MSG4, which includes a content at least including a terminal ID in MSG3, and allocates a Cell Radio Network Temporary Identity (CRNTI) to the mobile terminal.
The MSG1 is a Random access signal sent by the UE, and the MSG2 is a Random access response; the MSG3 sends its own related information for the UE, such as device ID, UE capability, etc.; the MSG4 is used for the base station to confirm the content of MSG3 and avoid false detection.
In the method for transmitting the synchronization signal provided by the embodiment of the invention, when the base station sends the synchronization signal, the base station sends the synchronization signal according to the period corresponding to the synchronization signal, wherein the synchronization signal comprises a PSS signal and an SSS signal; when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, and the directions of the synchronous signals sent by each time slot are different, so that the mobile terminal receives the synchronous signals and completes access, and the aims of synchronous design, synchronous search and random access under the coverage scene of multi-beam and multi-numerology parameters are fulfilled.
Referring to fig. 9, fig. 9 is a functional block diagram of an apparatus for transmitting a synchronization signal according to an embodiment of the present invention.
As shown in fig. 9, the apparatus includes:
a first sending module 901, configured to send a synchronization signal according to a period corresponding to the synchronization signal when sending the synchronization signal, where the synchronization signal includes a PSS signal and an SSS signal;
a second sending module 902, configured to send each synchronization signal through multiple time slots when sending the synchronization signal to a mobile terminal, so that the mobile terminal receives the synchronization signal and completes access.
Preferably, the directions of the synchronization signals transmitted in each slot are different from each other.
Preferably, the second sending module 902 is specifically configured to:
if the number of the synchronization time slots of the base station is N, the PSS signal has M PSS sequences, each PSS sequence has K time slots, each time slot is used for independently transmitting a beam, and the beams transmitted by different time slots are different, so that N ═ K × M is satisfied.
Preferably, the second sending module 902 is specifically configured to:
if the number of the synchronization time slots of the base station is N, the PSS signal has MK time slots, each time slot is used for independently transmitting a beam, and the beams transmitted by different time slots are different, so that N ═ K × M is satisfied.
Preferably, the second sending module 902 is specifically configured to:
if the number of the synchronous time slots of the base station is N, at least two different synchronous signal sequences are set, wherein one synchronous signal sequence is generated by adding interference to the other synchronous signal sequence, the sum of the number of the time slots in the two synchronous signal sequences is less than MK, the number of the time slot combinations of the two synchronous signal sequences is equal to MK, and N is K M.
Preferably, each slot is used to transmit a beam separately, and the beams transmitted by different slots are different.
Preferably, the first sending module 901 is specifically configured to:
the transmission positions of the PSS signals and the SSS signals are fixed offset, and the number of the time slots of the SSS signals is equal to the supportable maximum CellID number.
The embodiment of the invention provides a device for transmitting synchronous signals, wherein a base station transmits the synchronous signals according to the corresponding period of the synchronous signals when transmitting the synchronous signals, and the synchronous signals comprise PSS signals and SSS signals; and when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, so that the mobile terminal receives the synchronous signals and completes access, and the aims of synchronous design, synchronous search and random access under the coverage scene of multi-beam and multi-numerology parameters are fulfilled.
Referring to fig. 10, fig. 10 is a functional block diagram of another apparatus for transmitting a synchronization signal according to an embodiment of the present invention.
As shown in fig. 10, the apparatus includes:
a receiving module 1001, configured to receive a synchronization signal sent by a base station;
a detecting module 1002, configured to perform synchronous detection on the synchronization signal, and perform PBCH detection and SIB detection according to a result of the synchronous detection; the synchronous detection is used for detecting a sequence sent by a base station by the mobile terminal, determining a cell ID according to the sequence, and determining frame timing according to the position of a related peak value in synchronous detection;
an access module 1003, configured to acquire downlink synchronization information of the base station, select an access resource according to the downlink synchronization information, and send the selected access resource information to the base station to complete random access.
Preferably, the detecting module 1002 is specifically configured to:
and if the time domain parameter and the frequency domain parameter of the synchronization signal meet the demodulation capability of the numerology UE with the lowest sampling rate, the synchronization detection supports different numerology UEs to access the same carrier wave, and the same synchronization signal is multiplexed.
Preferably, the detecting module 1002 is further configured to: the frequency domain adopts the smallest frequency domain subcarrier width corresponding to numerology UE which can be supported by the system, and the time domain is a symbol length corresponding to the smallest frequency domain subcarrier width.
Preferably, the detecting module 1002 is specifically configured to:
if the PBCH signal time-frequency position and the synchronous signal time-frequency position are fixed time-frequency positions, determining the position of the PBCH signal through the PSS signal and the SSS signal;
demodulating PBCH signals according to the determined PBCH position, and reading information in the PBCH partial signals; the number of slots of PBCH is the same as the number of slots of the synchronization signal, and the transmission signal in each slot is the same, the transmission signal including: system bandwidth, frame number, and/or supportable numerology UE.
Preferably, the detecting module 1002 is specifically configured to:
directly detecting PBCH corresponding to the time slot S corresponding to the optimal synchronous signal; or,
and combining the N PBCHs and then carrying out joint detection.
Preferably, the apparatus further comprises:
and the judging module is used for judging whether to directly detect the PBCH corresponding to the time slot S corresponding to the optimal synchronization signal or not according to the peak-to-average ratio of the synchronization signal, or carrying out combined detection after combining the N PBCHs.
Preferably, the detecting module 1002 is specifically configured to:
detecting downlink control signaling of a control domain to acquire an SIB message, and broadcasting downlink control signaling of different numerology UEs using different numerology parameters when the base station supports multiple numerology parameters;
wherein the SIB message comprises RACH related parameters and different numerology usage different resource locations, and the related parameters comprise resource locations and usage sequences.
Preferably, the access module 1003 includes:
a first transmitting unit, configured to transmit a random sequence to the base station;
a determining unit, configured to determine numerology and synchronization detection information used by the mobile terminal after receiving the random sequence;
and the second sending unit is used for sending random access Response to the mobile terminal according to the detected random sequence information.
Preferably, the second sending unit is specifically configured to:
acquiring a corresponding optimal synchronous detection time slot according to a group number of a Random sequence, and sending RAR information according to precoding of the optimal time slot, wherein the Random Access Response comprises a sequence index, a TA, a scheduling grant and a distributed TC RNTI detected by the base station;
detecting the Random Access Response to determine whether the base station is successfully detected, if so, sending an MSG3 to the base station by the mobile terminal, wherein the MSG3 comprises the ID, the type and the Qos of the mobile terminal; so that the base station sends MSG4, which contains at least the terminal ID in MSG3, to the mobile terminal after receiving the MSG3 sent by the terminal, and distributes CRNTI to the mobile terminal.
The embodiment of the invention provides a device for transmitting synchronous signals, wherein a base station transmits the synchronous signals according to the corresponding period of the synchronous signals when transmitting the synchronous signals, and the synchronous signals comprise PSS signals and SSS signals; and when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, so that the mobile terminal receives the synchronous signals and completes access, and the aims of synchronous design, synchronous search and random access under the coverage scene of multi-beam and multi-numerology parameters are fulfilled.
The technical principle of the embodiment of the present invention is described above in conjunction with the specific embodiments. The description is only intended to explain the principles of embodiments of the invention and should not be taken in any way as limiting the scope of the embodiments of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the present invention.
Claims (30)
1. A method of transmitting a synchronization signal, the method comprising:
when a base station sends a synchronous signal, the synchronous signal is sent according to a period corresponding to the synchronous signal, wherein the synchronous signal comprises a PSS signal and an SSS signal;
and when the base station sends the synchronous signals to the mobile terminal, each synchronous signal is sent through a plurality of time slots, so that the mobile terminal receives the synchronous signals and completes access.
2. The method of claim 1, wherein the direction of the synchronization signal transmitted in each time slot is different from each other.
3. The method of claim 1 or 2, wherein when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, comprising:
and if the number of the synchronous time slots of the base station is N, the PSS signal has M PSS sequences, each PSS sequence has K time slots, and N is equal to K.
4. The method of claim 1 or 2, wherein when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, comprising:
and if the number of the synchronous time slots of the base station is N, the PSS signal has MK time slots, and N is K M.
5. The method of claim 1 or 2, wherein when the base station transmits the synchronization signals to the mobile terminal, each synchronization signal is transmitted through a plurality of time slots, comprising:
if the number of the synchronous time slots of the base station is N, at least two different synchronous signal sequences are set, wherein one synchronous signal sequence is generated by adding interference to the other synchronous signal sequence, the sum of the number of the time slots in the two synchronous signal sequences is less than MK, the number of the time slot combinations of the two synchronous signal sequences is equal to MK, and N is K M.
6. The method according to claim 1 or 2, wherein said transmitting according to the period corresponding to the synchronization signal comprises:
the sending position of the PSS signal and the sending position of the SSS signal are fixed offset, and the number of the time slots of the SSS signal is equal to the supportable maximum Cell ID number.
7. A method of transmitting a synchronization signal, the method comprising:
a mobile terminal receives a synchronous signal sent by a base station, carries out synchronous detection on the synchronous signal, and carries out PBCH detection and SIB detection according to the synchronous detection result; the synchronous detection is used for detecting a sequence sent by a base station by the mobile terminal, determining a cell ID according to the sequence, and determining frame timing according to the position of a related peak value in synchronous detection;
and the mobile terminal acquires the downlink synchronous information of the base station, selects the accessed resource according to the downlink synchronous information, and sends the selected accessed resource information to the base station to finish random access.
8. The method of claim 7, wherein the performing synchronization detection on the synchronization signal comprises:
and if the time domain parameter and the frequency domain parameter of the synchronization signal meet the demodulation capability of the numerology UE with the lowest sampling rate, the synchronization detection supports different numerology UEs to access the same carrier wave, and the same synchronization signal is multiplexed.
9. The method of claim 8, wherein the time domain parameters and the frequency domain parameters of the synchronization signal satisfy a demodulation capability of a lowest sampling rate numerology UE, comprising:
the frequency domain adopts the smallest frequency domain subcarrier width corresponding to numerology UE which can be supported by the system, and the time domain is a symbol length corresponding to the smallest frequency domain subcarrier width.
10. The method of claim 7, wherein the performing PBCH detection according to the synchronization detection result comprises:
if the PBCH signal time-frequency position and the synchronous signal time-frequency position are fixed time-frequency positions, determining the position of the PBCH signal through the PSS signal and the SSS signal;
demodulating PBCH signals according to the determined PBCH position, and reading information in the PBCH partial signals; the number of slots of PBCH is the same as the number of slots of the synchronization signal, and the transmission signal in each slot is the same, the transmission signal including: system bandwidth, frame number, and/or supportable numerology UE.
11. The method of claim 7, wherein the performing PBCH detection according to the synchronization detection result comprises:
the mobile terminal directly detects the PBCH corresponding to the time slot corresponding to the optimal synchronization signal; or,
and the mobile terminal performs combined detection on the N PBCHs.
12. The method of claim 11, wherein before the PBCH detection according to the synchronization detection result, further comprising:
and the mobile terminal judges whether to directly detect the PBCH corresponding to the time slot S corresponding to the optimal synchronization signal or not according to the peak-to-average ratio of the synchronization signal, or carries out combined detection after combining the N PBCHs.
13. The method of claim 7, wherein the performing SIB detection according to the synchronization detection result comprises:
the mobile terminal detects downlink control signaling of a control domain to acquire an SIB message, and broadcasts downlink control signaling of different numerology UEs by using different numerology parameters when the mobile terminal supports multiple numerology parameters;
wherein the SIB message comprises RACH related parameters and different numerology usage different resource locations, and the related parameters comprise resource locations and usage sequences.
14. The method according to any one of claims 7 to 13, wherein the performing random access after sending the resource information for selecting access to the base station comprises:
the mobile terminal sends a random sequence to the base station;
after receiving the random sequence, the base station determines numerology and synchronous detection information used by the mobile terminal;
and the base station sends Random Access Response to the mobile terminal according to the detected Random sequence information.
15. The method of claim 14, wherein the base station sends a Random Access Response to the mobile terminal according to the detected Random sequence information, comprising:
the base station acquires a corresponding optimal synchronous detection time slot according to a group number of a Random sequence, and sends RAR information according to the precoding of the optimal time slot, wherein the Random Access Response comprises a sequence index, a TA, a scheduling grant and a distributed TC RNTI detected by the base station;
the mobile terminal detects the Random Access Response to determine whether the base station is successfully detected, if so, the mobile terminal sends MSG3 to the base station, and the MSG3 comprises the ID, the type and the Qos of the mobile terminal; so that the base station sends MSG4, which contains at least the terminal ID in MSG3, to the mobile terminal after receiving the MSG3 sent by the terminal, and distributes CRNTI to the mobile terminal.
16. An apparatus for transmitting a synchronization signal, the apparatus comprising:
the device comprises a first sending module, a second sending module and a third sending module, wherein the first sending module is used for sending a synchronization signal according to a period corresponding to the synchronization signal when sending the synchronization signal, and the synchronization signal comprises a PSS signal and an SSS signal;
and the second sending module is used for sending each synchronous signal through a plurality of time slots when sending the synchronous signal to the mobile terminal, so that the mobile terminal receives the synchronous signal and completes access.
17. The apparatus of claim 16, wherein the direction of the synchronization signal transmitted in each time slot is different from each other.
18. The apparatus according to claim 16 or 17, wherein the second sending module is specifically configured to:
and if the number of the synchronous time slots of the base station is N, the PSS signal has M PSS sequences, each PSS sequence has K time slots, and N is equal to K.
19. The apparatus according to claim 16 or 17, wherein the second sending module is specifically configured to:
and if the number of the synchronous time slots of the base station is N, the PSS signal has MK time slots, and N is K M.
20. The apparatus according to claim 16 or 17, wherein the second sending module is specifically configured to:
if the number of the synchronous time slots of the base station is N, at least two different synchronous signal sequences are set, wherein one synchronous signal sequence is generated by adding interference to the other synchronous signal sequence, the sum of the number of the time slots in the two synchronous signal sequences is less than MK, the number of the time slot combinations of the two synchronous signal sequences is equal to MK, and N is K M.
21. The apparatus according to claim 16 or 17, wherein the first sending module is specifically configured to:
the transmission positions of the PSS signals and the SSS signals are fixed offset, and the number of the time slots of the SSS signals is equal to the supportable maximum CellID number.
22. An apparatus for transmitting a synchronization signal, the apparatus comprising:
a receiving module, configured to receive a synchronization signal sent by a base station;
a detection module, configured to perform synchronization detection on the synchronization signal, and perform PBCH detection and SIB detection according to a result of the synchronization detection; the synchronous detection is used for detecting a sequence sent by a base station by the mobile terminal, determining a cell ID according to the sequence, and determining frame timing according to the position of a related peak value in synchronous detection;
and the access module is used for acquiring the downlink synchronous information of the base station, selecting the accessed resource according to the downlink synchronous information, and sending the selected accessed resource information to the base station to finish random access.
23. The apparatus according to claim 22, wherein the detection module is specifically configured to:
and if the time domain parameter and the frequency domain parameter of the synchronization signal meet the demodulation capability of the numerology UE with the lowest sampling rate, the synchronization detection supports different numerology UEs to access the same carrier wave, and the same synchronization signal is multiplexed.
24. The apparatus of claim 23, wherein the detection module is further configured to: the frequency domain adopts the smallest frequency domain subcarrier width corresponding to numerology UE which can be supported by the system, and the time domain is a symbol length corresponding to the smallest frequency domain subcarrier width.
25. The apparatus according to claim 22, wherein the detection module is specifically configured to:
if the PBCH signal time-frequency position and the synchronous signal time-frequency position are fixed time-frequency positions, determining the position of the PBCH signal through the PSS signal and the SSS signal;
demodulating PBCH signals according to the determined PBCH position, and reading information in the PBCH partial signals; the number of slots of PBCH is the same as the number of slots of the synchronization signal, and the transmission signal in each slot is the same, the transmission signal including: system bandwidth, frame number, and/or supportable numerology UE.
26. The apparatus according to claim 22, wherein the detection module is specifically configured to:
directly detecting PBCH corresponding to the time slot S corresponding to the optimal synchronous signal; or,
and combining the N PBCHs and then carrying out joint detection.
27. The apparatus of claim 26, further comprising:
and the judging module is used for judging whether to directly detect the PBCH corresponding to the time slot S corresponding to the optimal synchronous signal or not according to the peak-to-average ratio of the synchronous signal before the PBCH detection is carried out according to the synchronous detection result, or carrying out combined detection after the N PBCHs are combined.
28. The apparatus according to claim 22, wherein the detection module is specifically configured to:
detecting downlink control signaling of a control domain to acquire an SIB message, and broadcasting downlink control signaling of different numerology UEs using different numerology parameters when the base station supports multiple numerology parameters;
wherein the SIB message comprises RACH related parameters and different numerology usage different resource locations, and the related parameters comprise resource locations and usage sequences.
29. The apparatus of any one of claims 22 to 28, wherein the access module comprises:
a first transmitting unit, configured to transmit a random sequence to the base station;
a determining unit, configured to determine numerology and synchronization detection information used by the mobile terminal after receiving the random sequence;
and the second sending unit is used for sending Random access response to the mobile terminal according to the detected Random sequence information.
30. The apparatus according to claim 29, wherein the second sending unit is specifically configured to:
acquiring a corresponding optimal synchronous detection time slot according to a group number of a Random sequence, and sending RAR information according to precoding of the optimal time slot, wherein the Random Access Response comprises a sequence index, a TA, a scheduling grant and a distributed TC RNTI detected by the base station;
detecting the Random Access Response to determine whether the base station is successfully detected, if so, sending an MSG3 to the base station by the mobile terminal, wherein the MSG3 comprises the ID, the type and the Qos of the mobile terminal; so that the base station sends MSG4, which contains at least the terminal ID in MSG3, to the mobile terminal after receiving the MSG3 sent by the terminal, and distributes CRNTI to the mobile terminal.
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