Method, device, base station and user equipment for realizing time synchronizationTechnical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method, an apparatus, a base station, and a user equipment for implementing time synchronization.
Background
In an LTE (Long Term Evolution) system, a UE (User Equipment) realizes time synchronization with a base station through a primary synchronization signal and a secondary synchronization signal. Under the premise that the Duplex mode is TDD (Time Division Duplex) or FDD (Frequency Division Duplex), the positions of the primary synchronization signal and the secondary synchronization signal in the system frame in the Time domain are fixed, and after the primary synchronization signal and the secondary synchronization signal are detected by the UE, the positions of the primary synchronization signal and the secondary synchronization signal in the system Time sequence can be determined, and the Time domain synchronization with the base station is realized.
In the Rel-14 discussion, a Beam scanning (Beam scanning) manner is introduced in the wireless communication system, and Beam scanning for a Beam (Beam) refers to scanning beams in the time domain by a base station for each Beam, and each Beam has its own synchronization signal, similarly to each cell in the LTE system. In such a design, the synchronization signal design scheme in LTE is adopted, which may cause confusion of the UE about the timing of the synchronization signal, and the UE may generate uncertainty about the position determination of the synchronization signal in the system timing. When the UE detects a synchronization signal, it cannot determine the corresponding position of the synchronization signal in the system timing, because the relative positions of the synchronization signals on different beams in the system timing are not determined to be the same. For example: if m is not equal to n, after the UE detects the synchronization signal, the UE cannot determine that the synchronization signal is specifically on symbol m or on symbol n, thereby causing uncertainty in the UE and the position determination of the synchronization signal in the system timing sequence.
To account for this timing uncertainty introduced by the beam sweep, there are two solutions currently under discussion in Rel-14:
scheme 1: the positions of the synchronous signals on different wave beams in the system time sequence are indicated by adopting different frequency division offset methods through the main synchronous signal and the auxiliary synchronous signal;
scheme 2: the positions of the synchronous signals on different beams in the system timing are indicated by a new synchronous signal sequence design or a method of adding a new synchronous signal.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art:
when the scheme 1 is adopted, the primary synchronization signal and the secondary synchronization signal are required to be realized in a frequency division mode, and the UE is required to perform blind detection on the relation between the primary synchronization signal and the secondary synchronization signal, so that the detection complexity is increased; when the scheme 2 is adopted, a new synchronization signal sequence needs to be designed or a new synchronization signal needs to be introduced, which brings complexity of synchronization signal design and detection.
Disclosure of Invention
The method, the device, the base station and the user equipment for realizing time synchronization can solve the problem that the user equipment is difficult to obtain the exact system time sequence caused by beam scanning, and can reduce the complexity of the synchronous signal design and detection process.
In a first aspect, the present invention provides a method for implementing time synchronization, where the method is applied to a base station, and the method includes:
and scanning the beams of two groups of beams with the synchronous signals in different scanning sequences in a synchronous period to generate different beam-based synchronous signal time domain relative offsets, so that the user equipment determines the positions of the synchronous signals in the system time sequence according to the different beam-based synchronous signal time domain relative offsets and realizes time synchronization, wherein the different time domain relative offsets have corresponding relations with the beam identifications and the relative positions of the synchronous signals belonging to different beams in the system time sequence.
Optionally, the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the offset of the start position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period from the start position of the first half of the synchronization period is equal to the offset of the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period from the start position of the second half of the synchronization period.
Optionally, the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the offset of the start position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period from the start position of the synchronization period is equal to the offset of the end position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period from the end position of the synchronization period.
Optionally, the position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are at predetermined positions in the synchronization period, and the end position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period is earlier than the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period.
Optionally, the position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period are both in the first half of the synchronization period or are both in the second half of the synchronization period, and the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are at predetermined positions in the synchronization period, and the end position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period is earlier than the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period.
Optionally, each beam with a synchronization signal is located on a different symbol in the same subframe, or on a different symbol in a different subframe, or on the same symbol in a different subframe, or on a different symbol in a different subframe.
In a second aspect, the present invention provides a method for implementing time synchronization, where the method is applied to a user equipment, and the method includes:
detecting front and back synchronization signals carried in the same wave beam;
acquiring the time domain relative offset between the two synchronous signals carried in the same wave beam;
based on the time domain relative offset between the two synchronous signals carried in the same beam, determining the positions of the beam identifier and the detected synchronous signal in the system time sequence according to the corresponding relation between the different time domain relative offsets and the beam identifier and the relative positions of the synchronous signals belonging to different beams in the system time sequence;
and realizing the time synchronization with the base station according to the position of the detected synchronous signal in the system time sequence.
Optionally, the obtaining the time domain relative offset between two previous synchronization signals and two subsequent synchronization signals carried in the same beam includes:
and calculating the time domain relative offset between the two synchronous signals carried in the same wave beam according to the time of detecting the former synchronous signal carried in the same wave beam and the time of detecting the latter synchronous signal carried in the same wave beam.
In a third aspect, the present invention provides an apparatus for implementing time synchronization, where the apparatus is located at a base station, and the apparatus includes:
and the scanning unit is used for scanning the beams of the two groups of beams with the synchronous signals in different scanning sequences in a synchronous period to generate different time domain relative offsets of the synchronous signals based on the beams, so that the user equipment determines the positions of the synchronous signals in the system time sequence according to the different time domain relative offsets of the synchronous signals based on the beams and realizes time synchronization, wherein the different time domain relative offsets have corresponding relations with the beam identifications and the relative positions of the synchronous signals belonging to the different beams in the system time sequence.
Optionally, the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the offset of the start position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period from the start position of the first half of the synchronization period is equal to the offset of the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period from the start position of the second half of the synchronization period.
Optionally, the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the offset of the start position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period from the start position of the synchronization period is equal to the offset of the end position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period from the end position of the synchronization period.
Optionally, the position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are at predetermined positions in the synchronization period, and the end position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period is earlier than the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period.
Optionally, the position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period are both in the first half of the synchronization period or are both in the second half of the synchronization period, and the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are at predetermined positions in the synchronization period, and the end position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period is earlier than the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period.
Optionally, each beam with a synchronization signal is located on a different symbol in the same subframe, or on a different symbol in a different subframe, or on the same symbol in a different subframe, or on a different symbol in a different subframe.
In a fourth aspect, the present invention provides an apparatus for implementing time synchronization, where the apparatus is located in a user equipment, and the apparatus includes:
the detecting unit is used for detecting two synchronous signals carried in the same wave beam;
the acquisition unit is used for acquiring the relative time domain offset between the two front and back synchronous signals carried in the same beam;
a determining unit, configured to determine, based on the time domain relative offset between the two synchronization signals carried in the same beam, the beam identifier and the detected position of the synchronization signal in the system timing sequence according to the corresponding relationship between different time domain relative offsets and the beam identifier and the relative positions of the synchronization signals belonging to different beams in the system timing sequence;
and the synchronization unit is used for realizing time synchronization with the base station according to the position of the detected synchronization signal in the system time sequence.
Optionally, the obtaining unit is configured to calculate a relative time domain offset between two previous synchronization signals carried in the same beam according to a time when a previous synchronization signal carried in the same beam is detected and a time when a next synchronization signal carried in the same beam is detected.
In a fifth aspect, the present invention provides a base station, where the base station includes the above apparatus for implementing time synchronization located in the base station.
In a sixth aspect, the present invention provides a user equipment, where the user equipment includes the above apparatus located in the user equipment for implementing time synchronization.
Compared with the prior art in which a method for indicating the positions of synchronization signals on different beams by using different frequency division offsets is adopted for a main synchronization signal and an auxiliary synchronization signal, the method, the device, the base station and the user equipment for realizing time synchronization provided by the embodiment of the invention can eliminate the requirement for realizing the main synchronization signal and the auxiliary synchronization signal in a frequency division manner, avoid the blind detection of the relation between the main synchronization signal and the auxiliary synchronization signal by the UE and reduce the complexity of the detection of the synchronization signals; compared with the method in the prior art that the positions of the synchronization signals on different beams are indicated in the system time sequence through the design of a new synchronization signal sequence or the addition of a new synchronization signal, the method can avoid the requirement of designing a new synchronization signal sequence or introducing a new synchronization signal, and reduces the complexity of designing and detecting the new synchronization signal.
Drawings
Fig. 1 is a flowchart of an embodiment 1 of a method for implementing time synchronization according to the present invention;
fig. 2 is a flowchart of embodiment 2 of a method for implementing time synchronization according to the present invention;
fig. 3 is a schematic implementation diagram of embodiment 3 of the method for implementing time synchronization provided by the present invention;
fig. 4 is a schematic implementation diagram of embodiment 4 of the method for implementing time synchronization provided by the present invention;
fig. 5 is a schematic implementation diagram of embodiment 5 of the method for implementing time synchronization provided by the present invention;
fig. 6 and fig. 7 are schematic diagrams of implementation of embodiment 6 of the method for implementing time synchronization provided by the present invention;
FIG. 8 is a schematic structural diagram of an apparatus for implementing time synchronization according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an apparatus for implementing time synchronization according to another 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
An embodiment of the present invention provides a method for implementing time synchronization, where the method is applied to a base station, and as shown in fig. 1, the method includes:
and S11, the base station scans the beams of the two groups of beams with the synchronization signals in different scanning orders in a synchronization period to generate different beam-based synchronization signal time domain relative offsets, so that the user equipment determines the positions of the synchronization signals in the system timing sequence according to the different beam-based synchronization signal time domain relative offsets and realizes time synchronization, wherein the different time domain relative offsets have corresponding relations with the beam identifications and the relative positions of the synchronization signals belonging to different beams in the system timing sequence.
Compared with the prior art in which the primary synchronization signal and the secondary synchronization signal adopt different frequency division offsets to indicate the positions of the synchronization signals on different beams in the system time sequence, the method for realizing time synchronization provided by the embodiment of the invention can eliminate the requirement of realizing the primary synchronization signal and the secondary synchronization signal in a frequency division manner, avoid the blind detection of the relation between the primary synchronization signal and the secondary synchronization signal by the UE, and reduce the complexity of the detection of the synchronization signals; compared with the method in the prior art that the positions of the synchronization signals on different beams are indicated in the system time sequence through the design of a new synchronization signal sequence or the addition of a new synchronization signal, the method can avoid the requirement of designing a new synchronization signal sequence or introducing a new synchronization signal, and reduces the complexity of designing and detecting the new synchronization signal.
Example 2
An embodiment of the present invention provides a method for implementing time synchronization, where the method is applied to a user equipment, and as shown in fig. 2, the method includes:
s21, the ue detects two synchronization signals carried in the same beam.
S22, the user equipment obtains the time domain relative offset between the two front and back synchronous signals carried in the same beam.
Specifically, the ue calculates a time domain relative offset between two previous synchronization signals carried in the same beam according to a time when a previous synchronization signal carried in the same beam is detected and a time when a next synchronization signal carried in the same beam is detected.
S23, the user equipment determines the positions of the beam mark and the detected synchronous signal in the system time sequence according to the corresponding relation between the relative time domain offset and the beam mark of different time domains and the relative positions of the synchronous signals belonging to different beams in the system time sequence based on the relative time domain offset between the two synchronous signals carried in the same beam.
And S24, the UE realizes time synchronization with the base station according to the position of the detected synchronization signal in the system time sequence.
Compared with the prior art in which the primary synchronization signal and the secondary synchronization signal adopt different frequency division offsets to indicate the positions of the synchronization signals on different beams in the system time sequence, the method for realizing time synchronization provided by the embodiment of the invention can eliminate the requirement of realizing the primary synchronization signal and the secondary synchronization signal in a frequency division manner, avoid the blind detection of the relation between the primary synchronization signal and the secondary synchronization signal by the UE, and reduce the complexity of the detection of the synchronization signals; compared with the method in the prior art that the positions of the synchronization signals on different beams are indicated in the system time sequence through the design of a new synchronization signal sequence or the addition of a new synchronization signal, the method can avoid the requirement of designing a new synchronization signal sequence or introducing a new synchronization signal, and reduces the complexity of designing and detecting the new synchronization signal.
The method for achieving time synchronization is described in detail below with specific embodiments.
Example 3
As shown in fig. 3, in the present embodiment, the beam scanning (beam sweeping) of the first group of beams (beams) with synchronization signals in the synchronization period and the beam scanning (beam sweeping) of the second group of beams with synchronization signals in the synchronization period are respectively in the first half and the second half of the synchronization period.
In order to distinguish the synchronization signal in the beam sweep of the first set of beams with synchronization signals within the synchronization period from the synchronization signal in the beam sweep of the second set of beams with synchronization signals within the synchronization period, the synchronization signal in the beam sweep of the first set of beams with synchronization signals within the synchronization period is denoted as SS + (synchronization signal positive) and the synchronization signal in the beam sweep of the second set of beams with synchronization signals within the synchronization period is denoted as SS- (synchronization signal negative).
The deviation of the starting position of the beam scanning of the first group of beams with the synchronization signals in the synchronization period from the starting position of the first half of the synchronization period is equal to the deviation of the starting position of the beam scanning of the second group of beams with the synchronization signals in the synchronization period from the starting position of the second half of the synchronization period, and the deviation is denoted as Toff. Wherein, ToffMay be zero.
The beam scanning order of the first group of beams with the synchronization signals in the synchronization period adopts the sequence 1, the beam scanning order of the second group of beams with the synchronization signals in the synchronization period adopts the sequence 2, and the sequence 1 is different from the sequence 2, so that the synchronization signals of each pair of the same beams in the synchronization period or two groups of beams with the synchronization signals before and after the synchronization period detected by the UE have different beam-based synchronization signal time domain relative offsets. A simple way of doing this is that sequence 2 is the reverse of sequence 1, but other ordering is not excluded.
The relative shift in time domain between the synchronization signal of beam 1(beam 1) in the first set of beams with synchronization signals in the synchronization period and the synchronization signal of beam 1 in the second set of beams with synchronization signals in the synchronization period is recorded as relative shift 1 and relative shift 1 ', the relative shift in time domain between the synchronization signal of beam 2(beam 2) in the first set of beams with synchronization signals in the synchronization period and the synchronization signal of beam 2 in the second set of beams with synchronization signals in the synchronization period is recorded as relative shift 2 and relative shift 2', the difference in the order of beam scanning of the beams with synchronization signals producing the difference between the relative shifts in time domain.
In the synchronization period or the synchronization period, the different time domain relative offsets between the synchronization signals of a pair of same beams in the two groups of beams with the synchronization signals before and after have the corresponding relationship with the beam identifiers and the relative positions of the synchronization signals belonging to different beams in the system timing sequence, and the corresponding relationship is preset and known to both the base station side and the UE side. And the UE judges and obtains the beam identifier and the position of the detected synchronous signal in the system time sequence according to the corresponding relation based on the detected synchronous signal carried in the beam and the time domain relative offset between the two synchronous signals before and after the beam.
As shown in fig. 3, in a beam sweep consisting of 4 beams, when the UE detects two synchronization signals (SS + and SS-) based on beam 1 in a synchronization period, the UE can calculate the relative time domain offset between the two synchronization signals to be T/2+3T, where T is the synchronization period and T is the separation time of SSs of different beams in a set of beam sweeps; based on the time domain relative offset (T/2+3T), the obtained two synchronization signals (SS + and SS-) and a preset corresponding relation, the UE judges that the current beam belongs to the beam 1 and judges that the offset value of the current synchronization signal SS + from the starting position of the synchronization period is offset 1, so that the UE obtains the current beam identifier (namely the current beam belongs to the beam 1) and obtains the relative position of the current SS in the system time sequence;
when the UE detects two times of synchronous signals (SS + and SS-) based on the beam 2 in the synchronous period, the UE can calculate that the time domain relative offset between the two times of synchronous signals is T/2+ T, and based on the time domain relative offset (T/2+ T), the obtained two times of synchronous signals (SS + and SS-) and a preset corresponding relation, the UE judges that the current beam belongs to the beam 2 and judges that the offset value of the current synchronous signal SS + from the starting position of the synchronous period is offset 2, so that the UE obtains the current beam identifier (namely the current beam belongs to the beam 2) and obtains the relative position of the current SS in the system time sequence.
The UE may determine that the first synchronization signal is in a first half period or a second half period of the synchronization period based on whether the detected first synchronization signal belongs to SS + or SS-, the UE may also determine that the second synchronization signal is in the first half period or the second half period of the synchronization period based on whether the detected second synchronization signal belongs to SS + or SS-, the UE may also determine that the synchronization signal SS + is in the first half period of the synchronization period based on a manner that the detected two synchronization signals belong to SS + before and SS-after, and the UE may also determine that the synchronization signal SS-is in the second half period of the synchronization period based on a manner that the detected two synchronization signals belong to SS-before and SS + after.
The synchronization period T may correspond to a frame in the current communication system, a half frame in the current communication system, or other preset synchronization period lengths.
Each beam with synchronization signals may be located on a different symbol in the same subframe, or on a different symbol in a different subframe, or on the same symbol in a different subframe, or on a different symbol in a different subframe.
For example: each frame comprises 10 subframes, each subframe comprises 14 symbols, and the distribution of the four beams 1, 2, 3, 4 with the synchronization signals may comprise:
beams 1, 2, 3, 4 are located on symbols 1, 2, 3, 4, respectively, within subframe 1; or,
beams 1, 2 are located on symbols 1, 8, respectively, in subframe 1, and beams 3, 4 are located on symbols 1, 8, respectively, in subframe 2; or,
beam 1 is located on symbol 1 in subframe 1, beam 2 is located on symbol 1 in subframe 2, beam 3 is located on symbol 1 in subframe 3, and beam 4 is located on symbol 1 in subframe 4; or,
beam 1 is located on symbol 1 in subframe 1, beam 2 is located on symbol 2 in subframe 2, beam 3 is located on symbol 3 in subframe 3, and beam 4 is located on symbol 4 in subframe 4.
Example 4
This embodiment is similar to embodiment 3, and differs from embodiment 3 in that in this embodiment, the deviation of the start position of beam scanning of the first group of beams with synchronization signals within the synchronization period from the start position of the synchronization period is equal to the deviation of the end position of beam scanning of the second group of beams with synchronization signals within the synchronization period from the end position of the synchronization period, denoted as Toff. Wherein, ToffMay be zero.
As shown in FIG. 4, in the beam scanning consisting of 4 beams, when the UE detects two synchronization signals (SS + and SS-) based on beam 1 in the synchronization period, the UE can calculate the relative time domain offset between the two synchronization signals to be T-2Toff-T, where T is the synchronization period and T is the separation time of SSs of different beams within a set of beam scans; the UE is based on the time domain relative offset (T-2T)off-t), the obtained two synchronization signals (SS + and SS-) and the preset corresponding relationship, judging that the current beam belongs to the beam 1 and judging that the offset value of the current synchronization signal SS + from the initial position of the synchronization period is offset 1, so that the UE obtains the current beam identifier (namely the current beam belongs to the beam 1) and obtains the time sequence of the current SS in the systemRelative position of (a);
when the UE detects two synchronization signals (SS + and SS-) based on the beam 2 in the synchronization period, the UE can calculate the relative time domain offset between the two synchronization signals to be T-2Toff-3T, UE based on the time domain relative offset (T-2T)off-3t), the obtained two synchronization signals (SS + and SS-) and a preset corresponding relationship, and determining that the current beam belongs to beam 2 and determining that the offset value of the current synchronization signal SS + from the start position of the synchronization period is offset 2, so that the UE obtains the current beam identifier (i.e. the current beam belongs to beam 2) and obtains the relative position of the current SS in the system timing sequence.
Example 5
This embodiment is similar to embodiment 3, and differs from embodiment 3 in that in this embodiment, the beam scanning of the first group of beams with synchronization signals in the synchronization period and the beam scanning of the second group of beams with synchronization signals in the synchronization period are at fixed positions within the synchronization period and do not overlap, the fixed positions are formed by predefinition, belong to configuration values default to the base station, and are known to both the UE and the base station.
As shown in fig. 5, the positions of the beam scanning of the first group of beams with synchronization signals within the synchronization period and the positions of the beam scanning of the second group of beams with synchronization signals within the synchronization period may be configured to be in the first half and the second half of the synchronization period, respectively.
The deviation between the starting position of the beam scanning of the first group of beams with synchronization signals in the synchronization period and the starting position of the first half of the synchronization period belongs to a default value configured by the base station, and is marked as Toff(ii) a The deviation between the starting position of beam scanning of the second group of beams with the synchronization signals in the synchronization period and the starting position of the second half part of the synchronization period belongs to a default value configured by the base station and is recorded as T'off(ii) a The beam scanning of the first group of beams with the synchronization signal in the synchronization period ends earlier than the second group of beams with the synchronization signal in the synchronization periodThe start position of the beam scanning of the beams with the synchronization signal is set, thereby ensuring that the two sets of beams do not overlap. Wherein, ToffAnd T'offAt least one of which may be zero.
The relative shift in time domain between the synchronization signal of beam 1 in the first set of beams with synchronization signals in the synchronization period and the synchronization signal of beam 1 in the second set of beams with synchronization signals in the synchronization period is recorded as relative shift 1 and relative shift 1 ', the relative shift in time domain between the synchronization signal of beam 2 in the first set of beams with synchronization signals in the synchronization period and the synchronization signal of beam 2 in the second set of beams with synchronization signals in the synchronization period is recorded as relative shift 2 and relative shift 2', the difference in the order of beam scanning of the beams with synchronization signals producing the difference between the relative shifts in time domain.
And the UE judges and obtains the beam identifier and the position of the detected synchronous signal in the system time sequence based on the detected synchronous signal carried in the beam and the time domain relative offset between the two synchronous signals before and after the beam.
As shown in FIG. 5, in the beam scanning consisting of 4 beams, when the UE detects two synchronization signals (SS + and SS-) based on beam 1 in the synchronization period, the UE can calculate the relative time domain offset between the two synchronization signals as T/2-Toff+T’off+3T, where T is the synchronization period and T is the separation time of SSs from different beams within a set of beam sweeps; UE based on the time domain relative offset (T/2-T)off+T’off+3t), the obtained two synchronization signals (SS + and SS-) and a preset corresponding relation, judging that the current beam belongs to the beam 1 and judging that the offset value of the current synchronization signal SS + from the initial position of the synchronization period is offset 1, so that the UE obtains the current beam identifier (namely the current beam belongs to the beam 1) and obtains the relative position of the current SS in the system time sequence;
when the UE detects two synchronization signals (SS + and SS-) based on beam 2 in the synchronization period, the UE can calculate the time domain phase between the two synchronization signalsFor offset of T/2-Toff+T’off+ T, UE based on the time domain relative offset (T/2-T)off+T’off+ t), the obtained two synchronization signals (SS + and SS-) and the preset corresponding relationship, judging that the current beam belongs to the beam 2 and judging that the offset value of the current synchronization signal SS + from the initial position of the synchronization period is offset 2, so that the UE obtains the current beam identifier (namely the current beam belongs to the beam 2) and obtains the relative position of the current SS in the system time sequence.
Example 6
The present embodiment is similar to embodiment 5, and differs from embodiment 5 in that in the present embodiment, the position of beam scanning of the first group of beams with synchronization signals within the synchronization period and the position of beam scanning of the second group of beams with synchronization signals within the synchronization period may be configured to be both in the first half of the synchronization period or both in the second half of the synchronization period.
The synchronization signal design in the beam sweep of the first set of beams with synchronization signals in the synchronization period and the synchronization signals in the beam sweep of the second set of beams with synchronization signals in the synchronization period may not be distinguished, i.e. SS + and SS-may not be distinguished, but does not exclude the scenario of distinguishing SS + from SS-for the purpose of simplifying the design of synchronization signals.
As shown in fig. 6 and 7, the relative offset between the start position of the beam sweep of the first group of beams with synchronization signals in the synchronization period and the start position of the synchronization period belongs to a default value configured by the base station, denoted as Toff(ii) a The relative offset between the starting position of the beam scanning of the second group of beams with the synchronization signals in the synchronization period and the starting position of the synchronization period belongs to a default value configured by the base station and is recorded as T'off(ii) a The end position of the beam scanning of the first group of beams with the synchronization signals in the synchronization period is earlier than the start position of the beam scanning of the second group of beams with the synchronization signals in the synchronization period, thereby ensuring that the two groups of beams do not overlap.
As shown in fig. 6 and 7, the relative time domain offset between the synchronization signal of beam 1 in the first group of beams with synchronization signals in the synchronization period and the synchronization signal of beam 1 in the second group of beams with synchronization signals in the synchronization period is recorded as relative offset 1 and relative offset 1 ', the relative time domain offset between the synchronization signal of beam 2 in the first group of beams with synchronization signals in the synchronization period and the synchronization signal of beam 2 in the second group of beams with synchronization signals in the synchronization period is recorded as relative offset 2 and relative offset 2', and the different sequences of beam scanning of the beams with synchronization signals produce the difference between the relative time domain offsets.
And the UE judges and obtains the beam identifier and the position of the detected synchronous signal in the system time sequence based on the detected synchronous signal carried in the beam and the relative time domain offset between the two synchronous signals.
As shown in FIG. 6, when the UE detects two synchronization signals (SS + and SS-) based on beam 1 in the synchronization period T in the first half of the synchronization period T in the beam scanning composed of 4 beams, the UE can calculate the relative time domain offset between the two synchronization signals to be T'off-Toff+3T, where T is the synchronization period and T is the separation time of SSs from different beams within a set of beam sweeps; UE is based on the time domain relative offset (T'off-Toff+3t), the obtained two synchronization signals (SS + and SS-) and a preset corresponding relation, judging that the current beam belongs to the beam 1 and judging that the offset value of the current synchronization signal SS + from the initial position of the synchronization period is offset 1, so that the UE obtains the current beam identifier (namely the current beam belongs to the beam 1) and obtains the relative position of the current SS in the system time sequence;
when the UE detects two synchronization signals (SS + and SS-) based on beam 2 in the synchronization period, the UE can calculate that the relative time domain offset between the two synchronization signals is T'off-Toff+ T, UE based on this time domain relative offset (T'off-Toff+ t) and two times before and after the obtainingThe synchronization signals (SS + and SS-) and the preset corresponding relation judge that the current beam belongs to the beam 2 and judge that the offset value of the current synchronization signal SS + from the starting position of the synchronization period is offset 2, so that the UE obtains the current beam identifier (namely the current beam belongs to the beam 2) and obtains the relative position of the current SS in the system time sequence.
In the embodiment of the invention, in the communication system adopting beam scanning, through the design of the synchronous signals and by utilizing the relative time domain deviation value between the synchronous signals, the UE can obtain the position of the detected synchronous signals in the system time sequence, thereby avoiding the uncertainty of the beam scanning on the system time synchronization. Compared with the method of indicating the positions of the synchronization signals on different beams in the system time sequence by adopting different frequency division offsets for the primary synchronization signal and the secondary synchronization signal, the method eliminates the requirement of realizing the primary synchronization signal and the secondary synchronization signal in a frequency division mode, avoids the blind detection of the UE on the relation between the primary synchronization signal and the secondary synchronization signal, and reduces the complexity of the synchronization signal detection. Compared with a method for indicating the positions of the synchronization signals on different beams in the system time sequence through the design of a new synchronization signal sequence or the addition of a new synchronization signal, the method avoids the requirement of designing a new synchronization signal sequence or introducing a new synchronization signal, and reduces the complexity of designing and detecting the new synchronization signal.
An embodiment of the present invention further provides a device for implementing time synchronization, where the device is located in a base station, and as shown in fig. 8, the device includes:
the scanning unit 11 is configured to perform beam scanning on two groups of beams with synchronization signals in different scanning orders within a synchronization period to generate different beam-based synchronization signal time domain relative offsets, so that the user equipment determines a position of a synchronization signal in a system timing sequence according to the different beam-based synchronization signal time domain relative offsets and implements time synchronization, where the different time domain relative offsets have a corresponding relationship with a beam identifier and a relative position of a synchronization signal belonging to different beams in the system timing sequence.
Compared with the prior art in which the method for indicating the positions of the synchronization signals on different beams by using different frequency division offsets through the main synchronization signal and the auxiliary synchronization signal is adopted, the device for realizing time synchronization provided by the embodiment of the invention can eliminate the requirement for realizing the main synchronization signal and the auxiliary synchronization signal in a frequency division manner, avoid the blind detection of the relation between the main synchronization signal and the auxiliary synchronization signal by the UE, and reduce the complexity of the detection of the synchronization signals; compared with the method in the prior art that the positions of the synchronization signals on different beams are indicated in the system time sequence through the design of a new synchronization signal sequence or the addition of a new synchronization signal, the method can avoid the requirement of designing a new synchronization signal sequence or introducing a new synchronization signal, and reduces the complexity of designing and detecting the new synchronization signal.
Optionally, the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the offset of the start position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period from the start position of the first half of the synchronization period is equal to the offset of the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period from the start position of the second half of the synchronization period.
Optionally, the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the offset of the start position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period from the start position of the synchronization period is equal to the offset of the end position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period from the end position of the synchronization period.
Optionally, the position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period are respectively in the first half and the second half of the synchronization period, and the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are at predetermined positions in the synchronization period, and the end position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period is earlier than the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period.
Optionally, the position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period are both in the first half of the synchronization period or are both in the second half of the synchronization period, and the beam scanning of the first group of beams with the synchronization signal in the synchronization period and the beam scanning of the second group of beams with the synchronization signal in the synchronization period are at predetermined positions in the synchronization period, and the end position of the beam scanning of the first group of beams with the synchronization signal in the synchronization period is earlier than the start position of the beam scanning of the second group of beams with the synchronization signal in the synchronization period.
Optionally, each beam with a synchronization signal is located on a different symbol in the same subframe, or on a different symbol in a different subframe, or on the same symbol in a different subframe, or on a different symbol in a different subframe.
The apparatus of this embodiment may be configured to implement the technical solution of the method embodiment located in the base station, and the implementation principle and the technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides a device for implementing time synchronization, where the device is located in a user equipment, and as shown in fig. 9, the device includes:
a detecting unit 21, configured to detect two synchronization signals carried in the same beam;
an obtaining unit 22, configured to obtain a time domain relative offset between the two previous and subsequent synchronization signals carried in the same beam;
a determining unit 23, configured to determine, based on the time domain relative offset between the two synchronization signals carried in the same beam, the beam identifier and the detected position of the synchronization signal in the system timing sequence according to the corresponding relationship between the different time domain relative offsets and the beam identifier and the relative positions of the synchronization signals belonging to different beams in the system timing sequence;
and the synchronization unit 24 is configured to implement time synchronization with the base station according to the position of the detected synchronization signal in the system timing sequence.
Compared with the prior art in which the method for indicating the positions of the synchronization signals on different beams by using different frequency division offsets through the main synchronization signal and the auxiliary synchronization signal is adopted, the device for realizing time synchronization provided by the embodiment of the invention can eliminate the requirement for realizing the main synchronization signal and the auxiliary synchronization signal in a frequency division manner, avoid the blind detection of the relation between the main synchronization signal and the auxiliary synchronization signal by the UE, and reduce the complexity of the detection of the synchronization signals; compared with the method in the prior art that the positions of the synchronization signals on different beams are indicated in the system time sequence through the design of a new synchronization signal sequence or the addition of a new synchronization signal, the method can avoid the requirement of designing a new synchronization signal sequence or introducing a new synchronization signal, and reduces the complexity of designing and detecting the new synchronization signal.
Optionally, the obtaining unit 22 is configured to calculate a time domain relative offset between two synchronization signals carried in the same beam according to a time when a previous synchronization signal carried in the same beam is detected and a time when a next synchronization signal carried in the same beam is detected.
The apparatus of this embodiment may be configured to execute the technical solution of the method embodiment located in the ue, and the implementation principle and the technical effect are similar, which are not described herein again.
The embodiment of the invention also provides a base station, which comprises the device for realizing time synchronization positioned in the base station.
The embodiment of the invention also provides the user equipment, which comprises the device for realizing the time synchronization positioned in the user equipment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.