CN105207755B - A kind of air interface synchronization method, base station and system - Google Patents
A kind of air interface synchronization method, base station and system Download PDFInfo
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- CN105207755B CN105207755B CN201410253934.6A CN201410253934A CN105207755B CN 105207755 B CN105207755 B CN 105207755B CN 201410253934 A CN201410253934 A CN 201410253934A CN 105207755 B CN105207755 B CN 105207755B
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Abstract
The invention discloses a kind of air interface synchronization method, base station and systems, wherein, the described method includes: first base station generates the first synchronous reference signal, wherein, the first base station is one of M base station in n-th layer cell, and first synchronous reference signal is located in n-th layer cell with the first base station, the synchronous reference signal of other base stations in addition to the first base station is mutually orthogonal；N is the positive integer more than or equal to 2, and M is the positive integer more than or equal to 1；The first base station sends first synchronous reference signal in preset synchronous subframe.
Description
Technical field
The present invention relates to the administrative skill of the communications field more particularly to a kind of air interface synchronization methods, base station and system.
Background technique
The time-frequency air interface synchronization performance of the network of cell (Small Cell) composition is mainly by Signal to Interference plus Noise Ratio distribution character
It determines.In the network topology structure of multi-hop layering air interface synchronization, synchronization signal is interfered mainly from adjacent bed Small Cell
In the downlink data for listening to subframe transmitting, and cross-layer, that is, N ± M layers of base station, M >=2, the interference base listened to N layers of base station network
Originally can ignore.Adjacent bed interference both includes interference of the Small Cell in upper layer to lower layer Small Cell, i.e., multiple N-1 layers of bases
It stands and sends the running time-frequency resource conflict each other of LRS signal, and some target cell causes to listen to performance decline to n-th layer.Also include
Interference of the lower layer Small Cell to upper layer Small Cell, i.e., some target cell of n-th layer is listened in subframe at some detects
When listening the LRS of N-1 layers of source cell, it by N+1 layers of eNB this listen to subframe send downlink data interference.
Currently, solving lower layer Small Cell is silent (muting) skill to the method for the interference of upper layer Small Cell
Art, i.e. listening in subframe in N, N+1 layers of base station do not send downlink data.And above-mentioned air interface synchronization technology is mainly for family
The application scenarios of front yard base station (Home eNodeB) propose that the number of base stations of same layer is generally less in tuftlet in the application scenarios,
Therefore down-going synchronous reference signal to each other interferes with each other problem not and is very serious, that is, is directed to some target of n-th layer
For cell, the base station data of N-1 layers of transmission LRS is less.Therefore, these N-1 layers of base station, which can choose, has certain frequency
Legacy RS (such as CRS, the reusing degree 3 of domain reusing degree；PRS, reusing degree 6) it is used as LRS, and by these legacy
The reusing degree of RS, the method by frequency offset (frequency offset) is orthogonal come the time-frequency for realizing LRS, to avoid LRS
Signal interferes with each other.Obviously, the LRS signal orthogonalization of a small number of base stations, such as same layer can only be at most realized by this method
Interior maximum orthogonal multiplex base station data≤6 supported.But not with the sparse deployment scenario of Home eNodeB (Home eNodeB)
Together, the application scenarios for also needing to pay close attention to dense deployment or even super-intensive deployment in small subzone network, are at this moment still eated dishes without rice or wine using above-mentioned
Simultaneous techniques is just unable to satisfy in the scene of cell network-intensive or super-intensive deployment, and same layer may include more than or equal to 6
When the micro- station a above Small Cell, interference problem of the upper layer Small Cell to lower layer Small Cell.
Summary of the invention
In view of this, it is small to can solve upper layer the purpose of the present invention is to provide a kind of air interface synchronization method, base station and system
Interference problem of the cell to lower layer's cell.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The present invention provides a kind of air interface synchronization methods, which comprises
First base station generates the first synchronous reference signal, wherein the first base station is M base station in n-th layer cell
One of, first synchronous reference signal and the first base station be located in n-th layer cell, its in addition to the first base station
His synchronous reference signal of base station is mutually orthogonal；N is the positive integer more than or equal to 2, and M is the positive integer more than or equal to 1；
The first base station sends first synchronous reference signal in preset synchronous subframe.
In above scheme, the method also includes: the pattern set of synchronous reference signal is configured, and is owned in the set
Pattern it is orthogonal mutually on running time-frequency resource；
Wherein, mode orthogonal on the running time-frequency resource comprises at least one of the following:
Based on the other orthogonal multiplex of orthogonal frequency division multiplex OFDM symbol level；
Based on the other orthogonal multiplex of sub-wave length；
Orthogonal multiplex based on the other time-frequency mixing of preset resource unit RE pattern level；
Correspondingly, the first synchronous reference signal of the generation includes: to choose one from the pattern set of synchronous reference signal
A pattern, for generating the first synchronous reference signal.
In above scheme, the pattern of the synchronous reference signal is that Physical Resource Block PRB is repeated or PRB is not repeated；
Wherein, the PRB repetition is that the RE resource of the first synchronous reference signal on all PRB is identical, the PRB
RE resource repeatedly for the first synchronous reference signal on different PRB is not exactly the same.
In above scheme, synchronous subframe scheduling user's set for multicast/multicast single-frequency network network MBSFN sub-frame or not
The unicast downlink subframe of UE.
In above scheme, transmission first synchronous reference signal includes:
When the synchronous subframe is MBSFN sub-frame, the first synchronous reference is sent in the domain MBSFN of the MBSFN sub-frame
Signal；
Alternatively, when the synchronous subframe is not dispatch the unicast downlink subframe of UE, the is sent in non-control channel region
One synchronous reference signal.
It is described to send the first synchronous reference signal side of comprising at least one of the following in non-control channel region in above scheme
Formula:
The first synchronous reference signal is only sent in the resource area of first synchronous reference signal；
First synchronous reference signal avoids control channel and/or other common channel resources；
First synchronous reference signal is quiet in control channel and/or the RE resource of other common channel resources conflicts
It is silent.
In above scheme, the method also includes: silent subframe is set；Wherein, the silent subframe is small at N-2 layers
Base station in cell sends the subframe of synchronous reference signal；
Wherein, the silent subframe is multicast/multicast single-frequency network network MBSFN sub-frame, does not send data in the domain MBSFN；
Or not dispatch the unicast downlink subframe of UE, and any data are not sent in non-control channel region；It or is almost complete empty
Subframe ABS subframe.
The present invention provides a kind of air interface synchronization methods, which comprises
Second base station is listened in subframe preset, and it is synchronous to listen to the first base station in n-th layer cell is sent first
Reference signal；Wherein, second base station is one of L base station in N+1 layers of cell；First synchronous reference signal with
The first base station is located in n-th layer cell, the synchronous reference signal of other base stations in addition to the first base station mutually just
It hands over；N is the positive integer more than or equal to 2, and L is the positive integer more than or equal to 1；
Second base station carries out Time and Frequency Synchronization according to first synchronous reference signal.
In above scheme, the subframe of listening to is MBSFN sub-frame, and does not send data in the domain MBSFN；
The unicast downlink subframe of UE is not either dispatched, and does not send any data in non-control channel region.
In above scheme, the method also includes: the corresponding community configured information of the first base station is obtained, according to described
Subframe is listened in community configured information determination.
The present invention provides a kind of base station, the base station includes:
Generation unit, the first synchronous reference signal for base station where generating, wherein the base station is that n-th layer is slight
One of M base station in area, first synchronous reference signal and the base station are located in n-th layer cell, in addition to the base station
Other base stations synchronous reference signal it is mutually orthogonal；N is the positive integer more than or equal to 2, and M is the positive integer more than or equal to 1；
Transmission unit, for sending first synchronous reference signal in preset synchronous subframe.
In above scheme, the generation unit is also used to configure the pattern set of synchronous reference signal, and in the set
All patterns are orthogonal mutually on running time-frequency resource；And one style is chosen from the pattern set of synchronous reference signal, it uses
In generating the first synchronous reference signal；
Wherein, mode orthogonal on the running time-frequency resource comprises at least one of the following:
Orthogonal multiplex based on OFDM symbol rank；
Based on the other orthogonal multiplex of sub-wave length；
Orthogonal multiplex based on the other time-frequency mixing of preset RE pattern level.
In above scheme, the pattern of the synchronous reference signal is that Physical Resource Block PRB is repeated or PRB is not repeated；Its
In, the PRB repetition is that the RE resource of the first synchronous reference signal on all PRB is identical, and the PRB does not repeat as not
RE resource with the first synchronous reference signal on PRB is not exactly the same.
In above scheme, the synchronous subframe is MBSFN sub-frame or the unicast downlink subframe for not dispatching user equipment (UE).
In above scheme, the transmission unit is specifically used for when the synchronous subframe is MBSFN sub-frame, described
The domain MBSFN of MBSFN sub-frame sends the first synchronous reference signal；
Alternatively, when the synchronous subframe is not dispatch the unicast downlink subframe of UE, the is sent in non-control channel region
One synchronous reference signal.
It is described to send the first synchronous reference signal side of comprising at least one of the following in non-control channel region in above scheme
Formula:
The first synchronous reference signal is only sent in the resource area of first synchronous reference signal；
First synchronous reference signal avoids control channel and/or other common channel resources；
First synchronous reference signal is quiet on control channel and/or other common channel resources, the RE resource of conflict
It is silent.
In above scheme, the generation unit is also used to be arranged silent subframe；Wherein, the silent subframe is in N-2
Base station in layer cell sends the subframe of synchronous reference signal；
Wherein, the silent subframe is MBSFN sub-frame, and does not send data in the domain MBSFN；Either do not dispatch UE's
Unicast downlink subframe, and any data are not sent in non-control channel region；Either ABS subframe.
The present invention also provides a kind of base station, and the base station includes:
Unit is listened to, base station is set to, for listening in subframe preset, listens to the first base in n-th layer cell
The first synchronous reference signal that station is sent；Wherein, second base station is one of L base station in N+1 layers of cell；Described
One synchronous reference signal is located in n-th layer cell with the first base station, other base stations in addition to the first base station it is same
It is mutually orthogonal to walk reference signal；N is the positive integer more than or equal to 2, and L is the positive integer more than or equal to 1；
Synchronization unit, for realizing Time and Frequency Synchronization according to second synchronous reference signal.
In above scheme, the subframe of listening to is MBSFN sub-frame, and does not send data in the domain MBSFN；
The unicast downlink subframe of UE is not either dispatched, and does not send any data in non-control channel region.
In above scheme, the base station further include: setting unit, for obtaining the corresponding cell configuration of the first base station
Information listens to subframe according to community configured information determination.
The present invention provides a kind of air interface synchronization system, the system comprises:
First base station is set to n-th layer cell, for generating the first synchronous reference signal, in preset synchronous subframe
Send first synchronous reference signal；Wherein, first synchronous reference signal be located in n-th layer cell, except described
The synchronous reference signal of other base stations outside first base station is mutually orthogonal；N is the positive integer more than or equal to 2；
Second base station is set to N+1 layers of cell, for listening in subframe preset, listens in the small cell of n-th layer
The first synchronous reference signal for sending of first base station；According to first synchronous reference signal, Time and Frequency Synchronization is carried out.
Air interface synchronization method, base station and system provided by the present invention, can make send synchronization signal when, guarantee and itself
The synchronization signal of other base stations of place layer is orthogonal state, so that the base station in next layer cell is receiving synchronous letter
Number when, as soon as not will receive the interference of the synchronization signal of layer base station on other, in this way, solving upper layer cell to lower layer
The interference problem of cell.
Detailed description of the invention
Fig. 1 is air interface synchronization method flow diagram one in the embodiment of the present invention；
Fig. 2 is frame structure schematic diagram in air interface synchronization method in the embodiment of the present invention；
Fig. 3 is air interface synchronization method flow diagram two in the embodiment of the present invention；
Fig. 4 a is synchronous reference signal orthogonal multiplex schematic diagram one provided in an embodiment of the present invention；
Fig. 4 b is synchronous reference signal orthogonal multiplex schematic diagram two provided in an embodiment of the present invention；
Fig. 5 a is synchronous reference signal orthogonal multiplex schematic diagram three provided in an embodiment of the present invention；
Fig. 5 b is synchronous reference signal orthogonal multiplex schematic diagram four provided in an embodiment of the present invention；
Fig. 6 a is synchronous reference signal orthogonal multiplex schematic diagram five provided in an embodiment of the present invention；
Fig. 6 b is synchronous reference signal orthogonal multiplex schematic diagram six provided in an embodiment of the present invention；
Fig. 7 a is synchronous reference signal orthogonal multiplex schematic diagram seven provided in an embodiment of the present invention；
Fig. 7 b is synchronous reference signal orthogonal multiplex schematic diagram eight provided in an embodiment of the present invention；
Fig. 8 a is synchronous reference signal orthogonal multiplex schematic diagram nine provided in an embodiment of the present invention；
Fig. 8 b is synchronous reference signal orthogonal multiplex schematic diagram ten provided in an embodiment of the present invention；
Fig. 9 is that base station of the embodiment of the present invention forms structural schematic diagram one；
Figure 10 is that base station of the embodiment of the present invention forms structural schematic diagram two.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further described in more detail.
Embodiment one,
Air interface synchronization method provided in this embodiment is applied to first base station, as shown in Figure 1, comprising:
Step 101: first base station generates the first synchronous reference signal, wherein the first base station is M base station of n-th layer
One of, first synchronous reference signal and the first base station be located in n-th layer, other base stations in addition to the first base station
Synchronous reference signal it is mutually orthogonal；
Step 102: the first base station sends first synchronous reference signal in preset synchronous subframe.
Here, before the execution step 101, method further include: the pattern set of the first synchronous reference signal of configuration, and
All patterns are orthogonal mutually on running time-frequency resource in the set；
Wherein, mode orthogonal on the running time-frequency resource may include following at least one: be based on orthogonal frequency division multiplexing
(OFDM, Orthogonal Frequency Division Multiplexing) other orthogonal multiplex of symbol level；Based on sub- load
The other orthogonal multiplex of wave scale；Orthogonal multiplex based on the other time-frequency mixing of preset RE pattern level.
Correspondingly, the first synchronous reference signal of the generation includes: to choose one from the pattern set of synchronous reference signal
A pattern, for generating the first synchronous reference signal.Wherein, the selection can not selected for other base stations of layer where selection
The pattern taken.
To being explained further for pattern (pattern) of the first synchronous reference signal (LRS): it is duplicate to can be PRB, i.e.,
In the preset synchronous subframe, the LRS on all PRB is identical；It is unduplicated to be also possible to PRB, i.e., it is preset same at this
On step frame, the RE resource of the LRS signal on different PRB can be different.All RE for latter situation, on multiple PRB
Resource constitutes a kind of LRS pattern together.
The preset synchronous subframe can be multicast/multicast single-frequency network network (MBSFN) subframe and/or the list for not dispatching UE
Broadcast downlink subframe；
Correspondingly, transmission first synchronous reference signal includes: when the synchronous subframe is multicast/multicast single-frequency
When network (MBSFN, Multicast Broadcast Single Frequency Network) subframe, in MBSFN
The domain MBSFN of frame sends special synchronous reference signal；
Alternatively, being sent in non-control channel region special when the synchronous subframe is not dispatch the unicast downlink subframe of UE
Use synchronous reference signal.
Wherein, described to comprise at least one of the following mode in non-control channel region the first synchronous reference signal of transmission:
The first synchronous reference signal is only sent in the resource area of first synchronous reference signal；
First synchronous reference signal avoids control channel and/or other common channel resources；
First synchronous reference signal is quiet on control channel and/or other common channel resources, the RE resource of conflict
It is silent.
Above-mentioned transmission first synchronous reference signal may include: that first synchronous reference signal is sent to second
Base station, so that Time and Frequency Synchronization is realized according to first synchronous reference signal in second base station；Wherein, second base station is
One of L base station in N+1 layers of cell.
Preferably, above scheme can also include: that silent subframe is arranged；Wherein, the silent subframe is small at N-2 layers
Base station in cell sends the subframe of synchronous reference signal.Above-mentioned silence subframe is MBSFN sub-frame or does not dispatch under the unicast of UE
Row subframe or almost full empty frame ABS (almost blank subframe) subframe.
Preferably, the above method can also include: that the first base station in the domain MBSFN of MBSFN sub-frame listens to upper one layer
The special synchronous reference signal of transmission.
The possible selection method of pattern of base station selected first synchronous reference signal (LRS) of multiple N layers of cells includes:
It is configured by some Centralized Controller base station (can be certain logic unit)；
By backhaul Signalling exchange, first base station passes through the LRS of other same layer base stations of backhaul interface polls
Pattern, and the LRS pattern of oneself is configured accordingly.Particularly, when same layer eNB is more, first base station can be further
Limit the range of convergence of the synchronization base station referenced by it.Restriction method can be to be obtained by the mutual location information of interaction, or
Person is the RS signal that first base station listens to other same layers eNB, and execute RSRP measurement, according to RSRP measurement result auxiliary judgment who
It is neighborhood eNB.
Fig. 2 is that the frame structure of layer and adjacent two layers where first base station is illustrated in the air interface synchronization method of this patent proposition
Figure, wherein D (downlink) subframe is synchronous subframe, and L (Network Listening) subframe is to listen to subframe, M
It (Muting) is silent subframe.Assuming that M base station of n-th layer sends the orthogonal synchronization of time-frequency each other in the same synchronous subframe
Reference signal；In the identical synchronous reference signal for listening to the transmission of N-1 layers of base station, to realize itself Time and Frequency Synchronization；In N-2
Layer base station sends the transmission for suspending data in the subframe of synchronous reference signal, to avoid interference upper layer (such as (n-1)th layer) base
Listen to Time and Frequency Synchronization signal in station.
As it can be seen that guaranteeing and other base stations of layer where itself when enabling to send synchronization signal through the above scheme
Synchronization signal is orthogonal state, so that the base station in next layer cell not will receive when receiving synchronization signal
As soon as the interference of the synchronization signal of layer base station on other, in this way, solving upper layer cell to the interference problem of lower layer's cell.
Embodiment two,
Air interface synchronization method provided in this embodiment is applied to the second base station, as shown in Figure 3, comprising:
Step 301: the second base station is listened in subframe preset, listens to what the first base station in n-th layer cell was sent
First synchronous reference signal；Wherein, second base station is one of L base station in N+1 layers of cell；Described first synchronous ginseng
Examine signal and the first base station be located in n-th layer cell, the synchronous reference letter of other base stations in addition to the first base station
It is number mutually orthogonal；N is the positive integer more than or equal to 2, and L is the positive integer more than or equal to 1；
Step 302: second base station carries out Time and Frequency Synchronization according to first synchronous reference signal.
The subframe of listening to is MBSFN sub-frame, and does not send data in the domain MBSFN；
The unicast downlink subframe of UE is not either dispatched, and does not send any data in non-control channel region.
Preferably, above scheme can also include: and stop sending data in preset silent subframe；Wherein, described quiet
Silent subframe is the subframe of the base station transmission synchronous reference signal in N-2 layers of cell.Above-mentioned silence subframe is MBSFN
Frame or the unicast downlink subframe for not dispatching UE, and any data or ABS subframe are not sent in non-control channel region.
If first base station sends the first synchronous reference signal using MBSFN sub-frame, second base station passes through specified
MBSFN sub-frame the domain MBSFN as listening to subframe, the first synchronous reference signal sent to first base station is listened to；
If the synchronization subframe that first base station uses is not dispatch the unicast downlink subframe of UE, the method can be with
Include: that second base station also needs to obtain the corresponding community configured information of the first base station, confidence is matched according to the cell
Subframe is listened in breath determination；Wherein, the community configured information may include the number of symbols that PDCCH is occupied, CRS, CSI-RS's
Time-frequency location etc..The community configured information can be obtained by the detection, and/or receiver blind examination of backhaul signaling.
Fig. 2 is that the frame structure of layer and adjacent two layers where first base station is illustrated in the air interface synchronization method of this patent proposition
Figure, wherein D (downlink) subframe is synchronous subframe, and L (Network Listening) subframe is to listen to subframe, M
It (Muting) is silent subframe.Assuming that M base station of n-th layer sends the orthogonal synchronization of time-frequency each other in the same synchronous subframe
Reference signal；In the identical synchronous reference signal for listening to the transmission of N-1 layers of base station, to realize itself Time and Frequency Synchronization；In N-2
Layer base station sends the transmission for suspending data in the subframe of synchronous reference signal, to avoid interference upper layer (such as (n-1)th layer) base
Listen to Time and Frequency Synchronization signal in station.
The generation method of second synchronous reference signal may include following at least one: based on OFDM symbol rank
Orthogonal multiplex；Based on the other orthogonal multiplex of sub-wave length；Orthogonal multiplex based on the other time-frequency mixing of preset RE pattern level.
Below with reference to Fig. 4 a, Fig. 4 b and Fig. 5 a, Fig. 5 b to provided in this embodiment based on the orthogonal multiple of OFDM symbol rank
With being described:
Wherein, when synchronous subframe is multicast/multicast single-frequency network network (MBSFN) subframe, as Fig. 4 a indicates m-th in n-th layer
The synchronization subframe 411 of base station, Fig. 4 b indicate the synchronization subframe 412 of l-th base station in n-th layer, the two are synchronizing subframe mutually just
It hands over.
As shown in Figure 5 a, when synchronous subframe is not to dispatch the unicast downlink subframe of UE and when synchronous reference signal is intended to account for
When the running time-frequency resource position (i.e. RE) and cell common reference signal (such as CRS, CSI-RS) 51 are clashed, then described
The first synchronous reference signal is only sent in the resource area of first synchronous reference signal；Or first synchronous reference signal avoid controlling
Channel processed and/or other common channel resources；Or first synchronous reference signal is in control channel and/or other public letters
Road resource, it is silent in the RE resource of conflict.If Fig. 5 a indicates the synchronization subframe 521 of m-th base station in n-th layer, Fig. 5 b indicates N
The synchronization subframe 522 of l-th base station in layer, it is mutually orthogonal that the two synchronize subframe.
It is understood that the sequence of synchronous reference signal transmitted by the multiple base stations of same layer can be different, tool can be
There is certain good related and cross correlation sequence.And synchronous reference signal transmitted by the multiple base station l of same layer occupies difference
OFDM symbol.
The other synchronous reference of sub-wave length is based on to provided in this embodiment below with reference to Fig. 6 a, Fig. 6 b and Fig. 7 a, Fig. 7 b
Signal in orthogonal multiplexing is described:
Wherein, when synchronous subframe is multicast/multicast single-frequency network network (MBSFN) subframe, as Fig. 6 a indicates m-th in n-th layer
The synchronization subframe 611 of base station, Fig. 6 b indicate the synchronization subframe 612 of l-th base station in n-th layer, the two are synchronizing subframe mutually just
It hands over.
As shown in Figure 7a, when synchronous subframe is not to dispatch the unicast downlink subframe of UE and when synchronous reference signal is intended to account for
When the running time-frequency resource position (i.e. RE) and cell common reference signal (such as CRS, CSI-RS) 72 are clashed, then only send
Cell common reference signal, if Fig. 7 a indicates the synchronization subframe 711 of m-th base station in n-th layer, Fig. 7 b indicates l-th in n-th layer
The synchronization subframe 712 of base station, it is mutually orthogonal that the two synchronize subframe.
It is understood that the sequence of synchronous reference signal transmitted by the multiple base stations of same layer can be different, tool can be
There is certain good related and cross correlation sequence.And synchronous reference signal transmitted by the multiple base stations of same layer occupy it is different
Subcarrier.
It is mixed to provided in this embodiment based on the other synchronous reference signal time-frequency of RE pattern level below with reference to Fig. 8 a, Fig. 8 b
Orthogonal multiplex is described:
It is said in principle, orthogonal multiplex signal can be divided in entire synchronous reference signal region by minimum unit of RE
Cloth must tie up entire OFDM symbol either subcarrier without being limited to.But in order to reduce signaling overheads, it is desirable to
Limited Time and Frequency Synchronization pattern is defined, this makes it possible to be indicate specific Small Cell occupancy with lesser signaling overheads
Which kind of Time and Frequency Synchronization pattern.
As shown at 8a, synchronous reference signal requires to occupy 1 according to specific signal-to-noise ratio one kind preferably Time and Frequency Synchronization pattern
A or multiple OFDM symbols.In each OFDM symbol, synchronous reference signal only takes up portion subcarriers.Particularly, synchronous ginseng
It examines signal and is uniformly distributed on entire subcarrier with equal subcarrier spacing.When synchronous subframe 82 is not dispatch under the unicast of UE
Row subframe and when the synchronous reference signal running time-frequency resource the to be occupied position (i.e. RE) and cell common reference signal (such as CRS,
CSI-RS etc.) when clashing, then only send cell common reference signal.
The difference of synchronous reference signal sequence transmitted by the multiple Small Cell of same layer can be with good related and mutual
Certain sequence of correlation properties.Synchronous reference signal frequency patterns transmitted by the multiple Small Cell of same layer are not overlapped each other
Region.
As it can be seen that enabling to synchronization signal and the synchronization signal of other base stations of layer where itself at just through the above scheme
Friendship state, so that the base station in next layer cell not will receive one layer of base on other when receiving synchronization signal
The interference for the synchronization signal stood, in this way, just solving upper layer cell to the interference problem of lower layer's cell.
In addition, above scheme can also listen to silent and AF panel silence technology in conjunction with improved, so that this patent side
The air interface synchronization technology that case is proposed can still be able to normally in Small Cell dense deployment and super-intensive deployment scenario
Work, and obtain higher Time and Frequency Synchronization performance.
Embodiment three,
A kind of base station is present embodiments provided, as shown in figure 9, the base station includes:
Generation unit 901, the first synchronous reference signal for base station where generating, wherein the base station is that n-th layer is small
One of M base station in cell, first synchronous reference signal and the base station are located in n-th layer cell, except the base station
The synchronous reference signal of other outer base stations is mutually orthogonal；N is the positive integer more than or equal to 2, and M is the positive integer more than or equal to 1；
Transmission unit 902, for sending first synchronous reference signal in preset synchronous subframe.
The generation unit is also used to configure the pattern set of synchronous reference signal, and pattern all in the set
It is orthogonal mutually on running time-frequency resource；And one style is chosen from the pattern set of synchronous reference signal, for generating first
Synchronous reference signal；
Wherein, mode orthogonal on the running time-frequency resource comprises at least one of the following:
Orthogonal multiplex based on OFDM symbol rank；
Based on the other orthogonal multiplex of sub-wave length；
Orthogonal multiplex based on the other time-frequency mixing of preset RE pattern level.
The synchronous subframe is MBSFN sub-frame, the unicast downlink subframe for not dispatching user equipment (UE).
The transmission unit 902 is specifically used for when the synchronous subframe is MBSFN sub-frame, in the MBSFN sub-frame
The domain MBSFN sends special synchronous reference signal；
Alternatively, being sent in non-control channel region special when the synchronous subframe is not dispatch the unicast downlink subframe of UE
Use synchronous reference signal.
The generation unit 901 is also used in preset silent subframe, stops sending data；Wherein, the silent son
Frame is the subframe of the base station transmission synchronous reference signal in N-2 layers of cell.
It is described to comprise at least one of the following mode in non-control channel region the first synchronous reference signal of transmission:
The first synchronous reference signal is only sent in the resource area of first synchronous reference signal；
First synchronous reference signal avoids control channel and/or other common channel resources；
First synchronous reference signal is quiet on control channel and/or other common channel resources, the RE resource of conflict
It is silent.
Fig. 2 is that the frame structure of layer and adjacent two layers where first base station is illustrated in the air interface synchronization method of this patent proposition
Figure, wherein D (downlink) subframe is synchronous subframe, and L (Network Listening) subframe is to listen to subframe, M
It (Muting) is silent subframe.Assuming that M base station of n-th layer sends the orthogonal synchronization of time-frequency each other in the same synchronous subframe
Reference signal；In the identical synchronous reference signal for listening to the transmission of N-1 layers of base station, to realize itself Time and Frequency Synchronization；In N-2
Layer base station sends the transmission for suspending data in the subframe of synchronous reference signal, to avoid interference upper layer (such as (n-1)th layer) base
Listen to Time and Frequency Synchronization signal in station.
As it can be seen that guaranteeing and other base stations of layer where itself when enabling to send synchronization signal through the above scheme
Synchronization signal is orthogonal state, so that the base station in next layer cell not will receive when receiving synchronization signal
As soon as the interference of the synchronization signal of layer base station on other, in this way, solving upper layer cell to the interference problem of lower layer's cell.
Example IV,
A kind of base station provided in this embodiment, as shown in Figure 10, the base station includes:
Unit 1001 is listened to, base station is set to, for listening in subframe preset, listens in n-th layer cell
The first synchronous reference signal that one base station is sent；Wherein, second base station is one of L base station in N+1 layers of cell；Institute
State the first synchronous reference signal and the first base station be located in n-th layer cell, other base stations in addition to the first base station
Synchronous reference signal it is mutually orthogonal；N is the positive integer more than or equal to 2, and L is the positive integer more than or equal to 1；
Synchronization unit 1002, for realizing Time and Frequency Synchronization according to second synchronous reference signal.
The base station further include: processing unit 1003, for stopping sending data in preset silent subframe；Wherein,
The silence subframe is the subframe of the base station transmission synchronous reference signal in N-2 layers of cell.
The base station further include: setting unit 1004, for obtaining the corresponding community configured information of the first base station.And
And the position for listening to subframe is determined according to the community configured information, for example, if the synchronization subframe that first base station uses is not
When dispatching the unicast downlink subframe of UE, community configured information can be issued, wherein the community configured information may include
The number of symbols that PDCCH is occupied, the time-frequency location etc. of CRS, CSI-RS.The community configured information can be believed by backhaul
The detection, and/or receiver blind examination of order obtain.
The generation method of second synchronous reference signal may include following at least one: based on OFDM symbol rank
Orthogonal multiplex；Based on the other orthogonal multiplex of sub-wave length；Orthogonal multiplex based on the other time-frequency mixing of preset RE pattern level.
Below with reference to Fig. 4 a, Fig. 4 b and Fig. 5 a, Fig. 5 b to provided in this embodiment based on the orthogonal multiple of OFDM symbol rank
With being described:
Wherein, when synchronous subframe is multicast/multicast single-frequency network network (MBSFN) subframe, as Fig. 4 a indicates m-th in n-th layer
The synchronization subframe 411 of base station, Fig. 4 b indicate the synchronization subframe 412 of l-th base station in n-th layer, the two are synchronizing subframe mutually just
It hands over.
As shown in Figure 5 a, when synchronous subframe is not to dispatch the unicast downlink subframe of UE and when synchronous reference signal is intended to account for
When the running time-frequency resource position (i.e. RE) and cell common reference signal (such as CRS, CSI-RS) 51 are clashed, then only send
Cell common reference signal, if Fig. 5 a indicates the synchronization subframe 521 of m-th base station in n-th layer, Fig. 5 b indicates l-th in n-th layer
The synchronization subframe 522 of base station, it is mutually orthogonal that the two synchronize subframe.
It is understood that the sequence of synchronous reference signal transmitted by the multiple base stations of same layer can be different, tool can be
There is certain good related and cross correlation sequence.And synchronous reference signal transmitted by the multiple base station l of same layer occupies difference
OFDM symbol.
The other synchronous reference of sub-wave length is based on to provided in this embodiment below with reference to Fig. 6 a, Fig. 6 b and Fig. 7 a, Fig. 7 b
Signal in orthogonal multiplexing is described:
Wherein, when synchronous subframe is multicast/multicast single-frequency network network (MBSFN) subframe, as Fig. 6 a indicates m-th in n-th layer
The synchronization subframe 611 of base station, Fig. 6 b indicate the synchronization subframe 612 of l-th base station in n-th layer, the two are synchronizing subframe mutually just
It hands over.
As shown in Figure 7a, when synchronous subframe is not to dispatch the unicast downlink subframe of UE and when synchronous reference signal is intended to account for
When the running time-frequency resource position (i.e. RE) and cell common reference signal (such as CRS, CSI-RS) 72 are clashed, then only send
Cell common reference signal, if Fig. 7 a indicates the synchronization subframe 711 of m-th base station in n-th layer, Fig. 7 b indicates l-th in n-th layer
The synchronization subframe 712 of base station, it is mutually orthogonal that the two synchronize subframe.
It is understood that the sequence of synchronous reference signal transmitted by the multiple base stations of same layer can be different, tool can be
There is certain good related and cross correlation sequence.And synchronous reference signal transmitted by the multiple base stations of same layer occupy it is different
Subcarrier.
It is mixed to provided in this embodiment based on the other synchronous reference signal time-frequency of RE pattern level below with reference to Fig. 8 a, Fig. 8 b
Orthogonal multiplex is described:
It is said in principle, orthogonal multiplex signal can be divided in entire synchronous reference signal region by minimum unit of RE
Cloth must tie up entire OFDM symbol either subcarrier without being limited to.But in order to reduce signaling overheads, it is desirable to
Limited Time and Frequency Synchronization pattern is defined, this makes it possible to be indicate specific Small Cell occupancy with lesser signaling overheads
Which kind of Time and Frequency Synchronization pattern.
As shown at 8a, synchronous reference signal requires to occupy 1 according to specific signal-to-noise ratio one kind preferably Time and Frequency Synchronization pattern
A or multiple OFDM symbols.In each OFDM symbol, synchronous reference signal only takes up portion subcarriers.Particularly, synchronous ginseng
It examines signal and is uniformly distributed on entire subcarrier with equal subcarrier spacing.When synchronous subframe 82 is not dispatch under the unicast of UE
Row subframe and when the synchronous reference signal running time-frequency resource the to be occupied position (i.e. RE) and cell common reference signal (such as CRS,
CSI-RS etc.) when clashing, then only send cell common reference signal.
The difference of synchronous reference signal sequence transmitted by the multiple Small Cell of same layer can be with good related and mutual
Certain sequence of correlation properties.Synchronous reference signal frequency patterns transmitted by the multiple Small Cell of same layer are not overlapped each other
Region.
As it can be seen that enabling to synchronization signal and the synchronization signal of other base stations of layer where itself at just through the above scheme
Friendship state, so that the base station in next layer cell not will receive one layer of base on other when receiving synchronization signal
The interference for the synchronization signal stood, in this way, just solving upper layer cell to the interference problem of lower layer's cell.
In addition, above scheme can also listen to silent and AF panel silence technology in conjunction with improved, so that this patent side
The air interface synchronization technology that case is proposed can still be able to normally in Small Cell dense deployment and super-intensive deployment scenario
Work, and obtain higher Time and Frequency Synchronization performance.
Preferably, the embodiment of the present invention also provides a kind of air interface synchronization system, the system comprises:
First base station is set to n-th layer cell, for generating the first synchronous reference signal, in preset synchronous subframe
Send first synchronous reference signal；Wherein, first synchronous reference signal be located in n-th layer cell, except described
The synchronous reference signal of other base stations outside first base station is mutually orthogonal；N is the positive integer more than or equal to 2；
Second base station is set to N+1 layers of cell, for listening in subframe preset, listens in the small cell of n-th layer
The first synchronous reference signal for sending of first base station；According to first synchronous reference signal, Time and Frequency Synchronization is carried out.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.Apparatus embodiments described above are merely indicative, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, such as: multiple units or components can combine, or
It is desirably integrated into another system, or some features can be ignored or not executed.In addition, shown or discussed each composition portion
Mutual coupling or direct-coupling or communication connection is divided to can be through some interfaces, the INDIRECT COUPLING of equipment or unit
Or communication connection, it can be electrical, mechanical or other forms.
Above-mentioned unit as illustrated by the separation member, which can be or may not be, to be physically separated, aobvious as unit
The component shown can be or may not be physical unit, it can and it is in one place, it may be distributed over multiple network lists
In member；Some or all of units can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
In addition, each functional unit in various embodiments of the present invention can be fully integrated into a processing module, it can also
To be each unit individually as a unit, can also be integrated in one unit with two or more units；It is above-mentioned
Integrated unit both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned include: movable storage device, it is read-only
Memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or
The various media that can store program code such as person's CD.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (17)
1. a kind of air interface synchronization method, which is characterized in that the described method includes:
First base station generates the first synchronous reference signal, wherein and the first base station is one of M base station in n-th layer cell,
The synchronous reference of first synchronous reference signal and other base stations in n-th layer cell, in addition to the first base station
Signal is mutually orthogonal；N is the positive integer more than or equal to 2, and M is the positive integer more than or equal to 1；
The first base station sends first synchronous reference signal in preset synchronous subframe；
Silent subframe is set；The silence subframe is the subframe of the base station transmission synchronous reference signal in N-2 layers of cell；
Wherein, the silent subframe is multicast/multicast single-frequency network network MBSFN sub-frame, does not send data in the domain MBSFN；Or for not
The unicast downlink subframe of UE is dispatched, and does not send any data in non-control channel region；It or is almost full empty frame ABS
Frame.
2. the method according to claim 1, wherein the method also includes: configure the sample of synchronous reference signal
Formula set, and pattern all in the set is orthogonal mutually on running time-frequency resource；
Wherein, mode orthogonal on the running time-frequency resource comprises at least one of the following:
Based on the other orthogonal multiplex of orthogonal frequency division multiplex OFDM symbol level；
Based on the other orthogonal multiplex of sub-wave length；
Orthogonal multiplex based on the other time-frequency mixing of preset resource unit RE pattern level；
Correspondingly, the first synchronous reference signal of the generation includes: one sample of selection from the pattern set of synchronous reference signal
Formula, for generating the first synchronous reference signal.
3. according to the method described in claim 2, it is characterized in that, the pattern of the synchronous reference signal is Physical Resource Block
PRB is repeated or PRB is not repeated；
Wherein, the PRB repetition is that the RE resource of the first synchronous reference signal on all PRB is identical, and the PRB is not weighed
RE resource again for the first synchronous reference signal on different PRB is not exactly the same.
4. the method according to claim 1, wherein the synchronous subframe is multicast/multicast single-frequency network network MBSFN
Subframe or the unicast downlink subframe for not dispatching user equipment (UE).
5. according to the method described in claim 4, it is characterized in that, transmission first synchronous reference signal includes:
When the synchronous subframe is MBSFN sub-frame, the first synchronous reference signal is sent in the domain MBSFN of the MBSFN sub-frame；
Alternatively, it is same to send first in non-control channel region when the synchronous subframe is not dispatch the unicast downlink subframe of UE
Walk reference signal.
6. according to the method described in claim 5, it is characterized in that, described send the first synchronous reference in non-control channel region
Signal comprises at least one of the following mode:
The first synchronous reference signal is only sent in the resource area of first synchronous reference signal；
First synchronous reference signal avoids control channel and/or other common channel resources；
First synchronous reference signal is silent in control channel and/or the RE resource of other common channel resources conflicts.
7. a kind of air interface synchronization method, which is characterized in that the described method includes:
Second base station is listened in subframe preset, listens to the first synchronous reference that the first base station in n-th layer cell is sent
Signal；Wherein, second base station is one of L base station in N+1 layers of cell；First synchronous reference signal be located at
The synchronous reference signal of other base stations in n-th layer cell, in addition to the first base station is mutually orthogonal；N is more than or equal to 2
Positive integer, L are the positive integer more than or equal to 1；
Second base station carries out Time and Frequency Synchronization according to first synchronous reference signal；Wherein the subframe of listening to is MBSFN
Subframe, and data are not sent in the domain MBSFN；
Or not dispatch the unicast downlink subframe of UE, and any data are not sent in non-control channel region.
8. being listened to the method according to the description of claim 7 is characterized in that second base station is listened in subframe preset
Before the first synchronous reference signal that first base station in n-th layer cell is sent, the method also includes: obtain described first
The corresponding community configured information in base station listens to subframe according to community configured information determination.
9. a kind of base station, which is characterized in that the base station includes:
Generation unit, the first synchronous reference signal for base station where generating, wherein the base station is M in n-th layer cell
One of a base station, first synchronous reference signal are same with other base stations in n-th layer cell, in addition to the base station
It is mutually orthogonal to walk reference signal；N is the positive integer more than or equal to 2, and M is the positive integer more than or equal to 1；
Transmission unit, for sending first synchronous reference signal in preset synchronous subframe；
The generation unit is also used to be arranged silent subframe；Wherein, the silent subframe is the base in N-2 layers of cell
It stands and sends the subframe of synchronous reference signal；Wherein, the silent subframe is MBSFN sub-frame, and does not send number in the domain MBSFN
According to；The unicast downlink subframe of UE is not either dispatched, and does not send any data in non-control channel region；Either ABS
Frame.
10. base station according to claim 9, which is characterized in that the generation unit is also used to configure synchronous reference signal
Pattern set, and pattern all in the set is orthogonal mutually on running time-frequency resource；And the sample from synchronous reference signal
One style is chosen in formula set, for generating the first synchronous reference signal；
Wherein, mode orthogonal on the running time-frequency resource comprises at least one of the following:
Orthogonal multiplex based on OFDM symbol rank；
Based on the other orthogonal multiplex of sub-wave length；
Orthogonal multiplex based on the other time-frequency mixing of preset RE pattern level.
11. base station according to claim 10, which is characterized in that the pattern of the synchronous reference signal is Physical Resource Block
PRB is repeated or PRB is not repeated；
Wherein, the PRB repetition is that the RE resource of the first synchronous reference signal on all PRB is identical, and the PRB is not weighed
RE resource again for the first synchronous reference signal on different PRB is not exactly the same.
12. base station according to claim 10, which is characterized in that the synchronous subframe is MBSFN sub-frame or does not dispatch use
The unicast downlink subframe of family equipment UE.
13. base station according to claim 9, which is characterized in that the transmission unit is specifically used for working as the synchronous subframe
When for MBSFN sub-frame, the first synchronous reference signal is sent in the domain MBSFN of the MBSFN sub-frame；
Alternatively, it is same to send first in non-control channel region when the synchronous subframe is not dispatch the unicast downlink subframe of UE
Walk reference signal.
14. base station according to claim 13, which is characterized in that described to send the first synchronous ginseng in non-control channel region
It examines signal and comprises at least one of the following mode:
The first synchronous reference signal is only sent in the resource area of first synchronous reference signal；
First synchronous reference signal avoids control channel and/or other common channel resources；
First synchronous reference signal is silent on control channel and/or other common channel resources, the RE resource of conflict.
15. a kind of base station, which is characterized in that the base station is the second base station, and second base station includes:
Unit is listened to, for listening in subframe preset, it is synchronous to listen to the first base station in n-th layer cell is sent first
Reference signal；Wherein, second base station is one of L base station in N+1 layers of cell；First synchronous reference signal with
The synchronous reference signal of other base stations in n-th layer cell, in addition to the first base station is mutually orthogonal；N be greater than etc.
In 2 positive integer, L is the positive integer more than or equal to 1；
Synchronization unit, for carrying out Time and Frequency Synchronization according to first synchronous reference signal；
Wherein, the subframe of listening to is MBSFN sub-frame, and does not send data in the domain MBSFN；
Or not dispatch the unicast downlink subframe of UE, and any data are not sent in non-control channel region.
16. base station according to claim 15, which is characterized in that the base station further include: setting unit, for obtaining
The corresponding community configured information of first base station is stated, subframe is listened to according to community configured information determination.
17. a kind of air interface synchronization system, which is characterized in that the system comprises:
First base station is set to n-th layer cell, for generating the first synchronous reference signal, sends in preset synchronous subframe
First synchronous reference signal；Wherein, first synchronous reference signal be located at n-th layer cell in, remove described first
The synchronous reference signal of other base stations outside base station is mutually orthogonal；N is the positive integer more than or equal to 2；
Silent subframe is set；The silence subframe is the subframe of the base station transmission synchronous reference signal in N-2 layers of cell；
Wherein, the silent subframe is multicast/multicast single-frequency network network MBSFN sub-frame, does not send data in the domain MBSFN；Or for not
The unicast downlink subframe of UE is dispatched, and does not send any data in non-control channel region；It or is almost full empty frame ABS
Frame；
Second base station is set to N+1 layers of cell, for listening in subframe preset, listens in the small cell of n-th layer
The first synchronous reference signal that one base station is sent；According to first synchronous reference signal, Time and Frequency Synchronization is carried out；
Wherein the subframe of listening to is MBSFN sub-frame, and does not send data in the domain MBSFN；
Or not dispatch the unicast downlink subframe of UE, and any data are not sent in non-control channel region.
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| CN111083781A (en) * | 2018-10-18 | 2020-04-28 | 普天信息技术有限公司 | Transmission method and device of PDCCH (physical Downlink control channel) information |
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