CN103516419B - A kind of method and device for dispatching air interface synchronization subframe - Google Patents
A kind of method and device for dispatching air interface synchronization subframe Download PDFInfo
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Abstract
The present invention provides a kind of method and device for dispatching air interface synchronization subframe and base station, and this method includes：It is determined that each cycle can be used for the special time period of schedule synchronization subframe；According to the base attribute of all subframes in above-mentioned special time period, the Candidate Set of the synchronous subframe in this cycle is determined；The synchronous subframe in this cycle is selected from the Candidate Set.Air interface synchronization moment On The Choice in the case where Femto cells do not have MBSFN sub-frame configuration can be solved according to the present invention.
Description
Technical field
The present invention relates to field of wireless communication, and in particular in a kind of LTE system Femto base stations perform air interface synchronization when
Adaptive synchronicity subframe scheduling method and device and base station.
Background technology
In GSM, co-channel interference is the key factor of system for restricting capacity.Especially identical networking technology
Realize and cause restriction of the co-channel interference to power system capacity to seem more prominent.For LTE (Long Term Evolution, for a long time
Evolution) for system, not only the base station of neighbor cell can produce interference, and the UE (user equipment) of neighbor cell to this cell
Also interference can be produced to this cell.
LTE system includes TDD (Time Division Duplex, time division duplex) and FDD (Frequence Division
Duplex, FDD) two kinds of duplex modes.In order to correct detected wireless signals, it is to avoid interference, power system capacity is improved,
In LTE system TDD with each base station is required under fdd mode between keep frequency it is synchronous；Further, since TDD system relies on time slot
It is higher to time precise requirements to divide up-downgoing, therefore it is required that keeping strict time synchronized between each base station.
Realize that synchronous technology mainly has satellite synchronization, 1588v2 synchronizations and air interface synchronization at present.
Satellite synchronization technology is synchronized using GPS (Global Positioning System, global positioning system),
Requirement to installation environment is higher, it is necessary to receive the signal of multiple satellites simultaneously, and general requirement has 120 ° of headroom, and A-GPS can
Suitable for indoor environment, the requirement to environment is reduced, but is not also suitable for completely enclosed environment.
It is tight that 1588v2 simultaneous techniques has distributed communication network using the high precision clock of IEEE 1588V2 agreements
The Timing Synchronization of lattice.The technical requirements transmission network supports 1588v2 to be compensated to the error that network transmission is brought in itself,
The environment of deployment also there are certain requirements.
Requirement of the air interface synchronization technology to deployed environment is relatively low, as long as base station is detected around in the presence of normal work
Adjacent base station a, it is possible to neighboring station is therefrom selected as object synchronization base station, by periodically adjusting and target BS
When frequency deviation, so as to realize synchronous with the when frequency deviation of target BS.
For LTE Femto base stations (Home eNodeB, abbreviation HeNB), it is difficult to obtain due to major deployments indoors
Gps signal, furthermore, it is contemplated that the Cost Problems of Home eNodeB, may not have GPS device, it is also possible to be inconvenient to dispose
1588v2 networks, therefore air interface synchronization mode is particularly important for Femto base stations.When the environment residing for Femto base stations with it is grand
Stand or when other Femto base stations have covering overlapping, Femto base stations just can be same as eating dishes without rice or wine using macro station or other Femto base stations
The target BS of step, realizes synchronization, so as to subtract using the main and auxiliary synchronizing signal and descending cell reference signals of target BS
Interference between few base station.
For LTE macro base stations, the GPS methods of synchronization are generally adopted by, without the use of air interface synchronization.GPS synchronization sides
Formula timing is accurate, it is contemplated that timing accuracy problem during air interface synchronization, and Femto base stations should preferentially be selected when performing air interface synchronization
Select has the overlapping macro station of covering as object synchronization base station with it, only when that can not search macro station signal, just selects other
Femto base stations are used as object synchronization base station.
The network deployment scenarios of Femto base stations are analyzed as follows：
When Femto base stations are as an isolated island, when being not covered with overlapping with other base stations, Femto base stations will not with it is other
Base station produces and interfered, and base station operation is in local autonomous mode.
When Femto base stations are in the overlay area of macro station signal, macro station is synchronous using GPS, the base station selected macro stations of Femto
As object synchronization base station, macro station is synchronized to using air interface synchronization mode.
When Femto base stations are not at the overlay area of macro station signal, but (it is referred to as neighbour in other adjacent Femto base stations
Stand) signal coverage areas when, it is necessary to judge the wheel synchronization type of neighboring station, and determined according to the order of following priority from high to low
Object synchronization base station：
The Femto neighboring stations of macro station are directly synchronized to, if the synchronous level of macro station is 0, then the synchronous level of the neighboring station is 1；
The Femto neighboring stations of other Femto base stations are synchronized to, the synchronous level of the neighboring station is more than 1；
Isolated island Femto neighboring stations, do not possess synchronous level, work in autonomous mode.Do not detect the Femto base stations started shooting afterwards
During the neighboring station for possessing level to other, the isolated island neighboring station that selection has worked in autonomous mode is eated dishes without rice or wine as object synchronization base station
It is synchronous, it is to avoid to produce adjacent cell interference.
Air interface synchronization process is divided into initial synchronisation and cycle synchronisation.Initial synchronisation completes initially setting up for air interface synchronization
Journey, cycle synchronisation on the basis of air interface synchronization is set up when entering line period, frequency offset tracking adjustment.
Femto base stations proceed by initial synchronization after the power-up.In the initial synchronization process, base station search is adjacent to base
Stand, identification PCI (Physical Cell ID, physical district ID), and the synchronous level of signal intensity according to neighboring station and place etc.
Relevant information determines object synchronization base station.Afterwards, PSS (the Primary Synchronization of target BS are detected in base station
Signal, master sync signal) and SSS (Secondary Synchronization Signal, auxiliary synchronous signals) acquisition frame numbers,
During progress, frequency deviation it is synchronous.
In PSS the and SSS signal process of base station detection target BS, itself can not carry out downlink transfer, will miss itself
PSS, SSS, PBCH (Physical Broadcast Channel, Physical Broadcast Channel) signal send.If PSS and SSS
Detect for cycle synchronisation, the UE (User Equipment, user equipment) for being linked into this base station will be affected greatly；Separately
Outside, calculating is synchronized using PSS and SSS, operand is very big, and the duration is longer.Therefore, it is suggested that the detection to PSS and SSS
Only used when searching for macro station, cycle synchronisation process generally tend to using CRS (Common Reference Signal, it is public
Reference signal) calculated.
After the completion of initial synchronisation, into cycle synchronisation handling process.
Inclined sensitivity is set when Cycle Length needed for cycle synchronisation is according to system pair.It is inclined during TDD system pair
More sensitive, synchronizing cycle is typically shorter than FDD system.Femto base stations need to stop just in period tracking air interface synchronization signal
Normal up-downgoing business is sent, and can be dispatched a special function subframe and be used as air interface synchronization, hereinafter referred to as synchronous
Subframe.In the 1ms time slots of this subframe, Femto base stations receive the CRS signals of target BS, the correlation of execution cycle synchronization
Operation.
In order to reduce synchronous subframe to having accessed the UE of Femto base stations influence, many air interface synchronization schemes tendencies at present
In using based on MBSFN (Multimedia Broadcast Single Frequency Network, multimedia broadcasting unicast
With frequency net) method of subframe.Base station execution cycle simultaneously operating at the time of MBSFN sub-frame has been claimed as, due to MBSFN sub-frame
It will not be arranged in the subframe with PSS, SSS, PBCH signal, UE will not be impacted.Eating dishes without rice or wine based on MBSFN sub-frame is same
Step mode can be used in TDD and FDD system.This mode allows the presence of multi-hop on synchronous path, and all nodes can be with
The mode (while being claimed as MBSFN sub-frame) of coordination makes minimum interference during air interface synchronization, as shown in Figure 1.Carrying out multi-hop
Under the application scenarios of air interface synchronization, object synchronization base station HeNB1 completes the sky of itself a declared MBSFN sub-frame moment
When mouth is synchronous, this base station HeNB2 also states that the subframe is MBSFN sub-frame, and stops downstream signal transmission at the subframe moment, with
The descending detection for being synchronized to macro station eNB0 to HeNB1 is avoided to produce interference.
MBSFN sub-frame is mainly used in transmission MBMS (Multimedia Broadcast/Multicast Service, many matchmakers
Body BroadCast MultiCast Service) data, MCE (Multicell/Multicast Coordination Entity, multiple cell/multicast association
Make entity) MBSFN sub-frame of MBMS data transmission is configured to for a MBSFN region, each cell receives what MCE was issued
MBSFN sub-frame can pick out suitable subframe according to the air interface synchronization cycle with postponing from transmission MBMS MBSFN sub-frame
Air interface synchronization operation is performed, equivalent to assigning the subframe new function.This new function subframe has borrowed the position of MBMS subframes
Put, carry out broadcast statement at the time of it occurs in cell system message, and do not appear in PSS, SSS, PBCH
In the subframe of signal, it can avoid detecting that the operation of PSS, SSS, PBCH signal is impacted to UE.
Air interface synchronization method based on MBSFN sub-frame needs cell to support MBMS, and by high-rise configuration MBSFN sub-frame
Cycle and sub-frame offset.In MBMS cell is not supported, without configurations of the MCE for MBSFN sub-frame cycle and position, by nothing
Method realizes the air interface synchronization based on MBSFN sub-frame.
The content of the invention
The technical problem to be solved in the present invention is to provide it is a kind of dispatch air interface synchronization subframe method and device and base station, with
Solve the air interface synchronization moment On The Choice in the case where Femto cells do not have MBSFN sub-frame configuration, it is possible to while compatibility has high level
Configure the situation of MBSFN sub-frame.
In order to solve the above-mentioned technical problem, the invention provides a kind of method for dispatching air interface synchronization subframe, including：
It is determined that each cycle can be used for the special time period of schedule synchronization subframe；
According to the base attribute of all subframes in above-mentioned special time period, the Candidate Set of the synchronous subframe in this cycle is determined；
The synchronous subframe in this cycle is selected from the Candidate Set.
Further, the above method also has following feature：The Candidate Set of the synchronous subframe for determining this cycle includes：
Candidate Set is determined according to one or more of following constraints：
Descending sub frame is only chosen in tdd systems as synchronous subframe；
Subframe where master sync signal is not as synchronous subframe；
Subframe where auxiliary synchronous signals is not as synchronous subframe；
The subframe of Master Information Block is sent not as synchronous subframe；
The subframe of system information block is sent not as synchronous subframe；
The subframe of beep-page message is sent not as synchronous subframe.
Further, the above method also has following feature：It is described to be determined to wait according to one or more of constraints
After selected works, in addition to：
The function subframe for not being suitable for being multiplexed in the Candidate Set with air interface synchronization is excluded, the Candidate Set is updated.
Further, the above method also has following feature：After determination or the renewal Candidate Set, in addition to：
The subframe in the Candidate Set is adaptively adjusted according to default constraint priority.
Further, the above method also has following feature：The synchronous subframe bag in this cycle is selected from the Candidate Set
Include：
From the Candidate Set selection can with air interface synchronization be multiplexed subframe as this cycle synchronous subframe；
There are multiple subframes that can be multiplexed with air interface synchronization in Candidate Set as described, then selected according to default MUX Priority
Select synchronous subframe of the optimal subframe in the Candidate Set as this cycle；
The subframe that can be mutually multiplexed with air interface synchronization is not present in Candidate Set as described, then chooses in the Candidate Set to go out at first
Existing subframe as this cycle synchronous subframe.
In order to solve the above problems, present invention also offers a kind of device for dispatching air interface synchronization subframe, including：
First module, for determining that each cycle can be used for the special time segment length of schedule synchronization subframe；
Second module, the Candidate Set of the synchronous subframe for determining this cycle；
3rd module, the synchronous subframe for selecting this cycle from the Candidate Set.
Further, said apparatus also has following feature：Second module, is one in following constraints
It is individual or multiple determine Candidate Set：
Descending sub frame is only chosen in tdd systems as synchronous subframe；
Subframe where master sync signal is not as synchronous subframe；
Subframe where auxiliary synchronous signals is not as synchronous subframe；
The subframe of Master Information Block is sent not as synchronous subframe；
The subframe of system information block is sent not as synchronous subframe；
The subframe of beep-page message is sent not as synchronous subframe.
Further, said apparatus also has following feature：
Second module, determines to be additionally operable to after Candidate Set according to one or more of constraints, excludes described
The function subframe being multiplexed with air interface synchronization is not suitable in Candidate Set, the Candidate Set is updated.
Further, said apparatus also has following feature：
Second module, it is determined that or update Candidate Set after be additionally operable to, according to it is default constraint priority to described
Subframe in Candidate Set is adaptively adjusted.
Further, said apparatus also has following feature：
3rd module, this week is used as specifically for the subframe that selection can be multiplexed with air interface synchronization from the Candidate Set
The synchronous subframe of phase；There are multiple subframes that can be multiplexed with air interface synchronization in Candidate Set as described, then it is excellent according to default multiplexing
First level selects the subframe in the Candidate Set as the synchronous subframe in this cycle；Being not present as described in Candidate Set can be with eating dishes without rice or wine together
The subframe that is mutually multiplexed is walked, then chooses the synchronous subframe of the subframe that occurs at first in the Candidate Set as this cycle.
In order to solve the above problems, present invention also offers a kind of base station, including above-mentioned device.
To sum up, the present invention provides a kind of method and device for dispatching air interface synchronization subframe and base station, can solve in Femto
Cell does not have the air interface synchronization moment On The Choice under MBSFN sub-frame configuration, and compatibility has high-rise configuration MBSFN sub-frame simultaneously
Situation.Adaptive air interface synchronization subframe scheduling method proposed by the present invention, can mitigate synchronous subframe to limited system resource
Waste, and reduce the influence that the introducing of synchronous subframe is caused to cell and UE.This adaptive dispatching method is applicable simultaneously
In the high-rise heterogeneous networks deployment scenario for not configuring or being configured with MBSFN sub-frame.When high level is configured with MBSFN sub-frame, equally
Synchronous subframe position can also be carried out using self-adapting dispatching method proposed by the present invention further preferred.
Brief description of the drawings
Fig. 1 is the schematic diagram of the air interface synchronization mode when high level of prior art is configured with MBSFN sub-frame；
Fig. 2 is the flow chart of the method for the scheduling air interface synchronization subframe of the embodiment of the present invention；
Fig. 3 is the schematic diagram of the initial candidate set determined according to subframe base attribute of the embodiment of the present invention；
Fig. 4 is the schematic diagram of the device of the scheduling air interface synchronization subframe of the embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Fig. 2 is the flow chart of the air interface synchronization subframe scheduling method of the embodiment of the present invention, as shown in Fig. 2 including following step
Suddenly：
Step 11, determine each cycle can be used for schedule synchronization subframe special time period；
When performing periodic empty synchronization, each cycle Femto base stations are needed from several in a special time period
The subframe for being adapted for carrying out air interface synchronization is determined in subframe.For example, it is assumed that synchronizing cycle is 1min, above-mentioned specific period
Length is 40ms, and base station can set the cycle timer that a time-out time is 1min, after timer each cycle time-out, choosing
40 subframes (time slot of each subframe is 1ms) after this moment are taken as the alternative special time period in this cycle.
Step 12, the base attribute according to all subframes in above-mentioned special time period, determine that the synchronous subframe in this cycle is waited
Selected works；
Determine that the synchronous subframe Candidate Set in this cycle may comprise steps of：
Step 121, synchronous subframe initial candidate set determined according to the subframe position constraints of Femto cells；It is initial to wait
The selection of selected works needs to integrate many factors, including but not limited to：
A, subframe type constraint
When performing cycle synchronisation, the downstream signal of Femto base stations detection object synchronization base station.In view of in TDD system,
The symbolic number that downlink transfer is carried out on special subframe is less, and DL (Downlink, descending) subframe is only chosen in TDD system as same
Step frame.
B, PSS, SSS constraint
For FDD, PSS is in subframe 0 and the last symbol of first slot (time slot) of subframe 5, and SSS is in subframe
0 and subframe 5 first slot second-to-last symbol on；
For TDD, PSS is on subframe 1 and first slot of subframe 6 the 3rd symbol, and SSS is in subframe 0 and subframe 5
The 2nd slot last symbol on.
The selection of synchronous subframe, which should try one's best, excludes above subframe position.
C, MIB, SIB1 constraint
Limited several most necessary, transmission most frequencies are included in MIB (Master Information Block, Master Information Block)
Numerous parameter, this is the broadcast message that UE is received at first when with cell downlink synchronization.Receive after MIB, UE would know that currently
The downlink system bandwidth (for example, serving cell is 20MHz cells) of serving cell, HARQ (Hybrid Automatic Repeat
Request, hybrid automatic repeat-request) indicate that (this is UE parsing Physical Downlink Control Channel (PDCCH) to channel configuration information
Basis) and system wireless frame number (SFN).These are all that UE correctly analysis service cell can send information (including other broadcast
Content) basis.
MIB is transmitted on PBCH, and each radio frames include 10 subframes, i.e., one wireless frame duration is 10ms.MIB
First time transmission is carried out in the subframe 0 of radio frame number aliquot 4, the subframe 0 of each radio frames is retransmitted, i.e., one is retransmitted per 10ms
It is secondary, the message of 4 repetitions, cycle 40ms are sent altogether.Due to the vital effect that MIB has, air interface synchronization subframe position
Selection need avoid send PBCH subframe.
Contained in SIB1 (System Information Block, system information block) whether allow UE access cell with
And the schedule information of follow-up other system informations.For example：Carrier ID (i.e. PLMN (Public belonging to cell ID, cell
Land Mobile Network, public land mobile network), tracking fields code (TAC), cell whether be prohibited mark
(CellBarred, the parameter can tell whether UE current areas UE can access), tdd mode sub-frame configuration and special subframe are matched somebody with somebody
Put.
SIB1 be in the subframe 5 of radio frame number aliquot 8 progress first time transmission, when radio frame number it is aliquot 2 when,
Subframe 5 is retransmitted, i.e., retransmitted once per 20ms, and the message of 4 repetitions, cycle 80ms are sent altogether.
The scheduling of synchronous subframe, which should try one's best, avoids MIB and SIB1 transmission, i.e., not in subframe 0, and the son in even frame
Frame 5 synchronizes subframe scheduling.
D, Paging (paging) constraint
E-UTRAN (Evolved-Universal Terrestrial Radio Access are come from order to receive
Network, the universal land radio access web of evolution) beep-page message, UE in specific radio frames specific sub-frame detection
Belong to this UE beep-page message.Remaining time UE can carry out DRX (Discontinuous Reception, discontinuous reception) biographies
It is defeated, it is meant that UE can close receiver to preserve the energy content of battery in remaining time.
According to agreement, Paging subframe position may be Paging in 0,4,5,9 work song frames, TDD system in FDD system
Subframe position may be 0,1,5,6 work song frames, it is relevant according to the concrete configuration of DRX cycle that position occurs in specific subframe.
In order to ensure that UE can obtain beep-page message in time in the drx mode, Paging can not postpone, and should not also leak hair,
Therefore the scheduling of synchronous subframe needs the subframe for avoiding sending Paging.
Analyzed based on more than, it can be seen that under LTE difference configurations, the selection result of synchronous subframe initial candidate set is not
With.It is in FDD system, and under the different ratio of uplink subframe to downlink subframe of TDD system, to be analyzed more than shown in Fig. 3
The initial candidate set result arrived, the blank space of optional position subframe position in figure of synchronous subframe.
Step 122, the function subframe for not being suitable for being multiplexed with air interface synchronization is excluded, and updates Candidate Set.
According to the concrete configuration of Femto cells and the specific business scenario of network, exclude uncomfortable in synchronous subframe Candidate Set
For the Femto function subframes being multiplexed with air interface synchronization, these Femto functions subframes, which may be acted on, needs up-downgoing business
The particular application of transmission, the scheduling of synchronous subframe should avoid these function subframes.Confirm after these subframe positions, update same
Step frame Candidate Set.
Step 123, the synchronous subframe Candidate Set can adaptively be adjusted according to the constraints of default priority
It is whole；
Specifically, it can be determined that now whether synchronous subframe Candidate Set is empty set, if being judged as empty set, suitably relaxes candidate
Collect judgment condition, update synchronous subframe Candidate Set.If judging not as empty set, into step 13.
In specific implementation, the difference that the selection mode of initial candidate set can be as the case may be is changed, same to step
The constraints of frame Candidate Set can also be adjusted suitably as needed.For example, from figure 2 it can be seen that in TDD system
In descending sub frame proportioning 0, subframe does not fully meet the analysis requirement of the above, in this case, it is necessary to according to actual needs
Relax the constraints of synchronous subframe, to avoid the occurrence of empty set.
After the function subframe position for being unsuitable for carrying out air interface synchronization is evaded, synchronous subframe Candidate Set is updated.This
The renewal operation of step may also cause empty set occur, now need also exist for relaxing the constraints to synchronous subframe, to avoid
There is empty set.
It can select after the synchronous subframe Candidate Set of step 122 updates and finished, the unified judgement and processing for carrying out empty set.
The generation of empty set is probably to cause because constraints is excessively harsh, it is also possible to be due to above-mentioned to " special time
The value selection of section " is not good.When setting too small for carrying out the period of Candidate Set judgement, it is also possible to cause empty set occur.
Therefore, it is determined that during synchronous subframe initial candidate set, should first ensure that the candidate time section of setting is proper.
When needing that synchronous subframe constraints is carried out relaxing processing, certain priority orders should be followed.For example, examining
It is to repeat to send to consider MIB/SIB 1, it is contemplated that preferentially remove this constraints.To different constraints, according to prior
The priority level of agreement is ranked up, and is excluded item by item since the constraints of lowest priority, until synchronous subframe candidate
Integrate not as empty set.
Step 13, the synchronous subframe in this cycle is selected from the Candidate Set；
According to the concrete configuration and spatial multiplexing gain of Femto cells, function that can be multiplexed with synchronous subframe is selected
Frame.Synchronous subframe carries out multiplexing with this kind of subframe can bring the gain in performance, reduce subframe and waste.
These reusable function subframes may have following several different situations, including but not limited to：
Acting on needs to keep silence etc. to carry out the particular application of up-downgoing business transmission, such as eICIC
(Enhanced Inter-Cell Interference Coordination, enhanced Inter-Cell Interference Coordination) function is used for
Evade the ABS (Almost Blank Subframe, almost blank subframe) of adjacent area interference.
The application scenario of transmission Cell Broadcast CB/multicast message is acted on, is such as used for the MBSFN sub-frame of MBMS transmission.
The position that these subframes occur may occur simultaneously with synchronous subframe Candidate Set.Position of the synchronous subframe to this kind of subframe
Put when being taken, the out tape of this kind of specific function can't be had a strong impact on, therefore the position that this kind of subframe occurs can
It is multiplexed with the position with synchronous subframe.Synchronous subframe is a class without service subframe, and inevitably reducing system can enter
The chance of row regular traffic scheduling.When synchronous subframe and this kind of subframe are multiplexed, the introducing pair of no service subframe can be reduced
The waste of limited system resource, so as to bring the gain in performance.
Particularly, can also be it is determined that during synchronous subframe Candidate Set, just this be waited when high level is configured with MBSFN sub-frame
Selected works as MBSFN sub-frame set subset, equivalent to increase by one Candidate Set constraints.When high level does not configure MBSFN
During frame, it is not necessary to consider that this is constrained.
In specific candidate time section, it is understood that there may be a variety of work(for being applied to be multiplexed with synchronous subframe on diverse location
Energy subframe, now needs to carry out preferably multiplexing position.When the preferred process of this step has considered spatial multiplexing gain and multiplexing
Effect property.
So-called spatial multiplexing gain, is referred specifically to after reusable function subframe is multiplexed with synchronous subframe to system original function
Influence degree, and Quality degree of effective utilization to system resource etc..Multiplexing can be calculated from the analysis of multiple different aspects to increase
Benefit, including but not limited to：
Reusable function subframe sends desired coincidence degree with synchronous subframe to control channel.Coincidence degree is higher,
Influence after being then multiplexed to control channel is smaller；
The degree of compatibility of reusable function subframe and synchronous subframe concrete function.As above-mentioned MBSFN sub-frame is mainly used in
MBMS data is transmitted, the transmission of MBMS will be reduced after multiplexing, its spatial multiplexing gain is less than and the ABS subframes of approximate blank
Spatial multiplexing gain.
So-called multiplexing is ageing, at the time of referring to that reusable function subframe occurs.In order to improve cycle synchronisation when
Effect property, in each cycle in the selection of all candidate's subframes in special time period, subframe moment of more early arrival should have compared with
High timeliness priority.
In specific implementation, base station judges to concentrate with the presence or absence of function that can be mutually multiplexed with air interface synchronization in current candidate
Frame, respective handling is carried out according to court verdict：
If in the presence of a function subframe that can be mutually multiplexed with air interface synchronization, being chosen for the synchronous subframe in this cycle；
If there are multiple function subframes that can be mutually multiplexed with air interface synchronization, it is necessary to which according to above method for optimizing, decision-making goes out multiple
With priority, and choose the reusable subframe of highest priority and be used as the synchronous subframe in this cycle；
If in the absence of the function subframe that can be mutually multiplexed with air interface synchronization, directly choosing the subframe occurred at first in Candidate Set and making
For the synchronous subframe in this cycle, to perform air interface synchronization as early as possible, it is ensured that air interface synchronization is ageing.
The adaptive air interface synchronization subframe scheduling method that the embodiment of the present invention is proposed, no matter whether Femto base stations configure
There is MBSFN sub-frame, the subframe position that each cycle performs air interface synchronization adaptively can be preferably gone out by base station.Base station is according to sky
Set mouthful synchronizing cycle and the attribute of several following subframes is analyzed after cycle timer, timer expiry, adaptively determine
Plan goes out the position of synchronous subframe.
Using the Femto base station synchronization subframe adaptive scheduling computational methods described in the embodiment of the present invention, with prior art
Compare, be applicable not only to the network deployment scenarios of configured MBSFN sub-frame, be also applied for the high-rise feelings for not configuring MBSFN sub-frame
Condition.The synchronous subframe self-adapting dispatching method that the embodiment of the present invention is proposed, can be not only suitable for FDD system with synchronizing cycle flexibly,
The various up-downgoings proportioning pattern of TDD system is also applied for, synchronous subframe scheduling mode is convenient, beneficial to realization, and takes into full account
The mode compatible with Femto other functions, can greatly enhance air interface synchronization compatible with the other functions in Femto base stations
Property, be conducive to the lifting of systematic function.
Fig. 4 is the schematic diagram of the device of the scheduling air interface synchronization subframe of the embodiment of the present invention, as shown in 43, including：
First module, for determining that each cycle can be used for the special time segment length of schedule synchronization subframe；
Second module, the Candidate Set of the synchronous subframe for determining this cycle；
3rd module, the synchronous subframe for selecting this cycle from the Candidate Set.
Wherein, second module, is the synchronization that this cycle is determined according to one or more of following constraints
The Candidate Set of subframe：
Descending sub frame is only chosen in tdd systems as synchronous subframe；
Subframe where master sync signal is not as synchronous subframe；
Subframe where auxiliary synchronous signals is not as synchronous subframe；
The subframe of Master Information Block is sent not as synchronous subframe；
The subframe of system information block is sent not as synchronous subframe；
The subframe of beep-page message is sent not as synchronous subframe.
Wherein, second module, determines to be additionally operable to after Candidate Set according to one or more of constraints, excludes
The function subframe being multiplexed with air interface synchronization is not suitable in the Candidate Set, the Candidate Set is updated.
Second module, it is determined that or update Candidate Set after be additionally operable to, according to the constraint bar of default priority
Part is adaptively adjusted to the subframe in the Candidate Set.
Wherein, the 3rd module, makees specifically for the subframe that selection can be multiplexed with air interface synchronization from the Candidate Set
For the synchronous subframe in this cycle；There are multiple subframes that can be multiplexed with air interface synchronization in Candidate Set as described, then according to default
MUX Priority selects the optimal subframe in the Candidate Set as the synchronous subframe in this cycle；It is not present as described in Candidate Set
The subframe that can be mutually multiplexed with air interface synchronization, then choose the same step of the subframe that occurs at first in the Candidate Set as this cycle
Frame.
The embodiment of the present invention also provides a kind of base station, includes the device of above-mentioned scheduling air interface synchronization subframe.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also use one or more integrated circuits to realize.Accordingly
Each module/unit in ground, above-described embodiment can be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
The preferred embodiments of the present invention are these are only, certainly, the present invention can also there are other various embodiments, without departing substantially from this
In the case of spirit and its essence, those skilled in the art work as can make various corresponding changes according to the present invention
And deformation, but these corresponding changes and deformation should all belong to the protection domain of appended claims of the invention.
Claims (5)
1. a kind of method for dispatching air interface synchronization subframe, including：
It is determined that each cycle can be used for the special time period of schedule synchronization subframe；
According to the base attribute of all subframes in above-mentioned special time period, the Candidate Set of the synchronous subframe in this cycle is determined, wherein,
Candidate Set is determined according to one or more of following constraints：
Descending sub frame is only chosen in tdd systems as synchronous subframe；
Subframe where master sync signal is not as synchronous subframe；
Subframe where auxiliary synchronous signals is not as synchronous subframe；
The subframe of Master Information Block is sent not as synchronous subframe；
The subframe of system information block is sent not as synchronous subframe；
The subframe of beep-page message is sent not as synchronous subframe；
The function subframe for not being suitable for being multiplexed in the Candidate Set with air interface synchronization is excluded, the Candidate Set is updated；
The subframe in the Candidate Set is adaptively adjusted according to default constraint priority；
The synchronous subframe in this cycle is selected from the Candidate Set.
2. method as claimed in claim 1, it is characterised in that：The synchronous subframe in this cycle is selected from the Candidate Set to be included：
From the Candidate Set selection can with air interface synchronization be multiplexed subframe as this cycle synchronous subframe；
There are multiple subframes that can be multiplexed with air interface synchronization in Candidate Set as described, then institute is selected according to default MUX Priority
State synchronous subframe of the optimal subframe in Candidate Set as this cycle；
The subframe that can be mutually multiplexed with air interface synchronization is not present in Candidate Set as described, then chooses what is occurred at first in the Candidate Set
Subframe as this cycle synchronous subframe.
3. a kind of device for dispatching air interface synchronization subframe, including：
First module, for determining that each cycle can be used for the special time segment length of schedule synchronization subframe；
Second module, the Candidate Set of the synchronous subframe for determining this cycle, wherein, second module, be according to it is following about
One or more of beam condition determines Candidate Set：
Descending sub frame is only chosen in tdd systems as synchronous subframe；
Subframe where master sync signal is not as synchronous subframe；
Subframe where auxiliary synchronous signals is not as synchronous subframe；
The subframe of Master Information Block is sent not as synchronous subframe；
The subframe of system information block is sent not as synchronous subframe；
The subframe of beep-page message is sent not as synchronous subframe；
Second module, determines to be additionally operable to after Candidate Set according to one or more of constraints, excludes the candidate
The function subframe for not being suitable for being multiplexed with air interface synchronization is concentrated, the Candidate Set is updated；
Second module, it is determined that or update Candidate Set after be additionally operable to, according to it is default constraint priority to the candidate
The subframe of concentration is adaptively adjusted；
3rd module, the synchronous subframe for selecting this cycle from the Candidate Set.
4. device as claimed in claim 3, it is characterised in that：
3rd module, this cycle is used as specifically for the subframe that selection can be multiplexed with air interface synchronization from the Candidate Set
Synchronous subframe；There are multiple subframes that can be multiplexed with air interface synchronization in Candidate Set as described, then according to default MUX Priority
The subframe in the Candidate Set is selected as the synchronous subframe in this cycle；Being not present as described in Candidate Set can be with air interface synchronization phase
The subframe of multiplexing, then choose the synchronous subframe of the subframe that occurs at first in the Candidate Set as this cycle.
5. a kind of base station, including the device as described in claim any one of 3-4.
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| CN104812049B (en) * | 2014-01-24 | 2018-10-12 | 中国移动通信集团公司 | A kind of method and apparatus of synchronization among base stations |
| CN104735774B (en) * | 2015-03-23 | 2018-05-01 | 京信通信系统（中国）有限公司 | A kind of air interface synchronization method and device based on networking |
| CN106572533B (en) * | 2015-10-10 | 2020-09-11 | 中兴通讯股份有限公司 | Paging processing method and device |
| CN110022603B (en) * | 2018-01-09 | 2021-04-16 | 大唐移动通信设备有限公司 | Synchronization method and device between base stations |
| CN110366237B (en) * | 2018-03-26 | 2021-08-20 | 展讯通信（上海）有限公司 | Method and device for joint estimation of time offset and frequency offset |
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