CN103516419A - Method and device for scheduling empty synchronous subframes - Google Patents
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Abstract
The invention provides a method and a device for scheduling empty synchronous subframes, and a base station. The method comprises the following steps: determining a specific time period of each cycle for scheduling synchronous subframes; determining a candidate set of the synchronous subframes in the present cycle according to essential attributes of all subframes in the specific time period; and selecting the synchronous subframes of the present cycle from the candidate set. According to the invention, the empty synchronous time selection problem when no MBSFN subframe configuration exists in a Femto cell can be solved.
Description
Technical field
The present invention relates to field of wireless communication, be specifically related to the synchronous subframe scheduling method of self adaptation and device and the base station while carrying out air interface synchronization, Femto base station in a kind of LTE system.
Background technology
In mobile communication system, co-channel interference is the key factor of system for restricting capacity.Especially the realization of identical networking technology makes co-channel interference seem more outstanding to the restriction of power system capacity.For LTE (Long Term Evolution, Long Term Evolution) system, not only the Hui Duizhe community, base station of neighbor cell produces and disturbs, and the UE of neighbor cell (subscriber equipment) Ye Huiduizhe community produces interference.
LTE system comprises TDD (Time Division Duplex, time division duplex) and two kinds of duplex modes of FDD (Frequence Division Duplex, Frequency Division Duplexing (FDD)).For correct detected wireless signals, avoid interference, improve power system capacity, in LTE system, TDD is synchronizeed with all requiring holding frequency between each base station under fdd mode; In addition, because TDD system relies on time slot, divide up-downgoing, time accuracy is required higher, therefore require to keep between each base station strict time synchronized.
Realize at present synchronous technology and mainly contain satellite synchronization, 1588v2 synchronously and air interface synchronization.
Satellite synchronization technology is utilized GPS (Global Positioning System, global positioning system) carry out synchronously, to having relatively high expectations of installation environment, need to receive the signal of a plurality of satellites simultaneously, General Requirements has the headroom of 120 °, A-GPS, applicable to indoor environment, has reduced the requirement to environment, but has not also been suitable for totally enclosed environment.
1588v2 simultaneous techniques utilizes the high precision clock of IEEE 1588V2 agreement to make distributed communication network have strict Timing Synchronization.This specification requirement transmission network supports that 1588v2 compensates with the error that Internet Transmission itself is brought, and the environment of disposing also be there are certain requirements.
Air interface synchronization technology is lower to the requirement of deployed environment, as long as base station detects the adjacent base station that existence has worked around, just can therefrom select a neighboring station as object synchronization base station, by periodically adjusting the time frequency deviation with target BS, thereby realize, synchronize with the time frequency deviation of target BS.
For LTE Femto base station (Home eNodeB, be called for short HeNB), indoor owing to being mainly deployed in, be difficult for obtaining gps signal, in addition, consider the Cost Problems of Home eNodeB, may not there is GPS equipment, also 1588v2 network may be inconvenient to dispose, so air interface synchronization mode is particularly important for Femto base station.When having, the residing environment in Femto base station and macro station or other Femto base station cover when overlapping, Femto base station just can be using macro station or other Femto base station as the target BS of air interface synchronization, utilize main and auxiliary synchronizing signal and the descending cell reference signals of target BS to realize synchronously, thereby reduce the interference between base station.
For LTE macro base station, what generally adopt is the GPS method of synchronization, does not need to use air interface synchronization.The GPS method of synchronization regularly accurately, timing accuracy problem while considering air interface synchronization, Femto base station is when carrying out air interface synchronization, should preferentially select to have with it and cover overlapping macro station as object synchronization base station, only, in the time cannot searching macro station signal, just select other Femto base station as object synchronization base station.
Network design scene analysis to Femto base station is as follows:
When Femto base station is as an isolated island, do not cover when overlapping with other base station, Femto base station can not produce phase mutual interference with other base station, and base station works in local autonomous mode.
When the overlay area of Femto base station in macro station signal, macro station is used GPS synchronous, and the base station selected macro station of Femto, as object synchronization base station, adopts air interface synchronization mode to be synchronized to macro station.
When the overlay area in macro station signal not, Femto base station, but during signal coverage areas in other adjacent Femto base station (being called neighboring station), need to judge the wheel synchronization type of neighboring station, and determine object synchronization base station according to following priority order from high to low:
Directly be synchronized to the Femto neighboring station of macro station, the synchronous level of establishing macro station is 0, and the synchronous level of this neighboring station is 1;
Be synchronized to the Femto neighboring station of other Femto base station, the synchronous level of this neighboring station is greater than 1;
Isolated island Femto neighboring station, does not possess synchronous level, works in autonomous mode.When the Femto base station of rear start does not detect the neighboring station that other possesses level, select the isolated island neighboring station that has worked in autonomous mode to carry out air interface synchronization as object synchronization base station, avoid producing adjacent cell and disturb.
Air interface synchronization process is divided into initial synchronisation and cycle synchronisation.Initial synchronisation completes the initial process of establishing of air interface synchronization, the enterprising line period in basis that cycle synchronisation is set up in air interface synchronization time, frequency offset tracking adjustment.
Femto base station starts to carry out initial synchronization after powering on.In initial synchronization, base station search neighbor base station, identification PCI (Physical Cell ID, physical district ID), and determine object synchronization base station according to relevant informations such as the synchronous levels of the signal strength signal intensity of neighboring station and place.Afterwards, PSS (Primary Synchronization Signal, master sync signal) and SSS (Secondary Synchronization Signal, auxiliary synchronous signals) that target BS is detected in base station obtain frame number, while carrying out, frequency deviation is synchronous.
Base station is detected in the PSS and SSS signal process of target BS, and self cannot carry out downlink transfer, and PSS, the SSS, PBCH (Physical Broadcast Channel, the Physical Broadcast Channel) signal that miss self are sent.If PSS and SSS detect for cycle synchronisation, will affect greatly being linked into the UE (User Equipment, subscriber equipment) of this base station; In addition, use PSS and SSS synchronously to calculate, operand is very large, and the duration is longer.Therefore, suggestion is only used the detection of PSS and SSS when searching for macro station, and cycle synchronisation process generally tends to use CRS (Common Reference Signal, public reference signal) to calculate.
After initial synchronisation completes, enter cycle synchronisation handling process.
The required Cycle Length of cycle synchronisation according to system to time inclined to one side sensitivity set.TDD system to time partially comparatively responsive, synchronizing cycle is generally short than FDD system.Femto base station need to stop normal up-downgoing business and send when period tracking air interface synchronization signal, can dispatch a special function subframe and use as air interface synchronization, hereinafter referred to as synchronous subframe.In the 1ms of this subframe time slot, the CRS signal of receiving target base station, Femto base station, the associative operation that the execution cycle is synchronous.
In order to reduce synchronous subframe to accessing the impact of the UE of Femto base station, at present a lot of air interface synchronization schemes tend to use the method based on MBSFN (Multimedia Broadcast Single Frequency Network, multimedia broadcasting clean culture is with frequency net) subframe.Base station, being claimed as execution cycle in the moment simultaneous operation of MBSFN subframe, because MBSFN subframe can not be arranged in the subframe with PSS, SSS, PBCH signal, can not impact UE.Air interface synchronization mode based on MBSFN subframe all can be used at TDD and FDD system.This mode allows to have multi-hop on synchronous path, minimum interference when all nodes can make air interface synchronization in the mode (being claimed as MBSFN subframe) of coordinating simultaneously, as shown in Figure 1.Carrying out under the application scenarios of multi-hop air interface synchronization, object synchronization base station HeNB1 is when a declared MBSFN subframe completes the air interface synchronization of self constantly, this base station HeNB2 also states that this subframe is MBSFN subframe, and constantly stop downstream signal transmission in this subframe, to avoid the descending detection that HeNB1 is synchronized to macro station eNB0 to produce interference.
MBSFN subframe is mainly used in MBMS transmission (Multimedia Broadcast/Multicast Service, multimedia broadcast multi-broadcasting business) data, MCE (Multicell/Multicast Coordination Entity, many cell/multicast cooperation entities) be that a MBSFN area configurations is for the MBSFN subframe of MBMS transfer of data, receive after the MBSFN sub-frame configuration that MCE issues each community, can be according to the air interface synchronization cycle, from the MBSFN subframe of MBMS transmission, pick out suitable subframe and carry out air interface synchronization operation, be equivalent to give the function that this subframe is new.This new function subframe has been used the position of MBMS subframe, the moment of its appearance has been broadcasted statement in cell system message, and there will not be and have in the subframe of PSS, SSS, PBCH signal, can avoid the operation that UE is detected to PSS, SSS, PBCH signal to impact.
Air interface synchronization method based on MBSFN subframe needs community to support MBMS, and is offset by cycle and the subframe of high level configuration MBSFN subframe.In not supporting the community of MBMS, there is no MCE for the configuration of MBSFN period of sub-frame and position, cannot realize the air interface synchronization based on MBSFN subframe.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and device and base station of dispatching air interface synchronization subframe, to solve the air interface synchronization moment On The Choice not having in Femto community under MBSFN sub-frame configuration, and can the compatible situation that has high-rise configuration MBSFN subframe of while.
In order to solve the problems of the technologies described above, the invention provides a kind of method of dispatching air interface synchronization subframe, comprising:
Determine that each cycle can be used for dispatching the special time period of synchronous subframe;
According to the base attribute of all subframes in above-mentioned special time period, determine the Candidate Set of the synchronous subframe in this cycle;
From described Candidate Set, select the synchronous subframe in this cycle.
Further, said method also has feature below: the Candidate Set of the synchronous subframe in described definite this cycle comprises:
According to one or more in following constraints, determine Candidate Set:
In tdd systems, only choose descending sub frame as synchronous subframe;
The subframe at master sync signal place is not as synchronous subframe;
The subframe at auxiliary synchronous signals place is not as synchronous subframe;
Send the subframe of Master Information Block not as synchronous subframe;
The subframe of transmitting system block of information is not as synchronous subframe;
Send the subframe of beep-page message not as synchronous subframe.
Further, said method also has feature below: described according to after the one or more definite Candidate Set in constraints, also comprise:
Get rid of in described Candidate Set and be not suitable for the function subframe multiplexing with air interface synchronization, upgrade described Candidate Set.
Further, said method also has feature below: described determine or upgrade Candidate Set after, also comprise:
According to default constraint priority, the subframe in described Candidate Set is carried out to self adaptation adjustment.
Further, said method also has feature below: from described Candidate Set, select the synchronous subframe in this cycle to comprise:
The subframe that selection can be multiplexing with air interface synchronization from described Candidate Set is as the subframe of synchronizeing in this cycle;
As described in there are a plurality of subframes that can be multiplexing with air interface synchronization in Candidate Set, according to default multiplexing priority, select optimum subframe in the described Candidate Set synchronous subframe as this cycle;
As described in do not exist in Candidate Set can be mutually multiplexing with air interface synchronization subframe, choose the subframe that occurs at first in the described Candidate Set synchronous subframe as this cycle.
In order to address the above problem, the present invention also provides a kind of device of dispatching air interface synchronization subframe, comprising:
The first module, for determining that each cycle can be used for dispatching the special time segment length of synchronous subframe;
The second module, for determining the Candidate Set of the synchronous subframe in this cycle;
The 3rd module, for selecting the synchronous subframe in this cycle from described Candidate Set.
Further, said apparatus also has feature below: described the second module is to determine Candidate Set according to one or more in following constraints:
In tdd systems, only choose descending sub frame as synchronous subframe;
The subframe at master sync signal place is not as synchronous subframe;
The subframe at auxiliary synchronous signals place is not as synchronous subframe;
Send the subframe of Master Information Block not as synchronous subframe;
The subframe of transmitting system block of information is not as synchronous subframe;
Send the subframe of beep-page message not as synchronous subframe.
Further, said apparatus also has feature below:
Described the second module, according to after the one or more definite Candidate Set in constraints also for, get rid of in described Candidate Set and be not suitable for the function subframe multiplexing with air interface synchronization, upgrade described Candidate Set.
Further, said apparatus also has feature below:
Described the second module, determine or also upgrade after Candidate Set for, according to default constraint priority, the subframe in described Candidate Set is carried out to self adaptation adjustment.
Further, said apparatus also has feature below:
Described the 3rd module, subframe that can be multiplexing with air interface synchronization specifically for selection from described Candidate Set is as the subframe of synchronizeing in this cycle; As described in there are a plurality of subframes that can be multiplexing with air interface synchronization in Candidate Set, according to default multiplexing priority, select subframe in the described Candidate Set synchronous subframe as this cycle; As described in do not exist in Candidate Set can be mutually multiplexing with air interface synchronization subframe, choose the subframe that occurs at first in the described Candidate Set synchronous subframe as this cycle.
In order to address the above problem, the present invention also provides a kind of base station, comprises above-mentioned device.
To sum up, the invention provides a kind of method and device and base station of dispatching air interface synchronization subframe, can solve the air interface synchronization moment On The Choice not having in Femto community under MBSFN sub-frame configuration, and compatibility has high level to configure the situation of MBSFN subframe simultaneously.The adaptive air interface synchronization subframe scheduling method that the present invention proposes, can alleviate the waste of synchronous subframe to limited system resource, and the introducing that reduces synchronous subframe impact that community and UE are caused.This adaptive dispatching method is applicable to the high-rise heterogeneous networks deployment scenario that does not configure or dispose MBSFN subframe simultaneously.When high level disposes MBSFN subframe, equally also can adopt the self-adapting dispatching method that the present invention proposes to carry out further preferably synchronous subframe position.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the air interface synchronization mode of the high level of prior art while disposing MBSFN subframe;
Fig. 2 is the flow chart of method of the scheduling air interface synchronization subframe of the embodiment of the present invention;
Fig. 3 be the embodiment of the present invention according to the schematic diagram of the definite initial candidate set of subframe base attribute;
Fig. 4 is the schematic diagram of device of the scheduling air interface synchronization subframe of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
Fig. 2 is the flow chart of the air interface synchronization subframe scheduling method of the embodiment of the present invention, as shown in Figure 2, comprises the following steps:
In the execution cycle, during air interface synchronization, the subframe that is applicable to carry out air interface synchronization need to be determined several subframes in a special time period in each cycle Femto base station.For example, the assumes synchronization cycle is 1min, above-mentioned specific time period length is 40ms, base station can arrange the cycle timer that a time-out time is 1min, after timer each cycle is overtime, choose the alternative special time period of this moment 40 subframes (time slot of each subframe is 1ms) afterwards as this cycle.
The synchronous subframe Candidate Set of determining this cycle can comprise the following steps:
The constraint of A, subframe type
Execution cycle, when synchronous, the downstream signal of object synchronization base station was detected in Femto base station.Consider that, in TDD system, the symbolic number of carrying out downlink transfer on special subframe is less, in TDD system, only choose DL (Downlink, descending) subframe as synchronous subframe.
The constraint of B, PSS, SSS
For FDD, PSS is on last symbol of first slot of subframe 0 and subframe 5 (time slot), and SSS is on the second-to-last symbol of first slot of subframe 0 and subframe 5;
For TDD, PSS is on the 3rd symbol of first slot of subframe 1 and subframe 6, and SSS is on last symbol of the 2nd slot of subframe 0 and subframe 5.
The selection of synchronous subframe should be got rid of above subframe position as far as possible.
The constraint of C, MIB, SIB1
In MIB (Master Information Block, Master Information Block), comprise limited several the most necessary, send parameter the most frequently, this is the broadcast that UE receives at first when synchronous with cell downlink.After receiving MIB, the downlink system bandwidth that UE can be known current service cell (for example, Serving cell is 20MHz community), HARQ (Hybrid Automatic Repeat Request, mixed automatic retransfer request) indicating channel configuration information (this is the basis that UE resolves Physical Downlink Control Channel (PDCCH)) and system wireless frame number (SFN).These are all the correctly bases of analysis service community transmission information (comprising other broadcasted content) of UE.
MIB transmits on PBCH, and each radio frames comprises 10 subframes, and a radio frames duration is 10ms.MIB transmits for the first time in the subframe 0 of radio frame number aliquot 4, and the subframe 0 of each radio frames is retransmitted, and every 10ms retransmits once, sends altogether the message repeating for 4 times, cycle 40ms.Due to the vital effect that MIB has, the selection of air interface synchronization subframe position need to avoid sending the subframe of PBCH.
In SIB1 (System Information Block, system information block), comprised the schedule information that whether allows UE access community and follow-up other system information.For example: the carrier ID under ID, community, community (is PLMN (Public Land Mobile Network, public land mobile network), whether tracking territory code (TAC), community are prohibited to identify (CellBarred, this parameter can tell whether UE current area UE can access), tdd mode sub-frame configuration and special subframe configuration etc.
SIB1 transmits for the first time in the subframe 5 of radio frame number aliquot 8, when radio frame number aliquot 2, in subframe 5, retransmits, and every 20ms retransmits once, sends altogether the message repeating for 4 times, cycle 80ms.
The scheduling of synchronous subframe should be avoided the transmission of MIB and SIB1 as far as possible, and not in subframe 0, and the subframe in even frame 5 is carried out synchronous subframe scheduling.
The constraint of D, Paging (paging)
In order to receive (the Evolved-Universal Terrestrial Radio Access Network from E-UTRAN, the universal land radio access web of evolution) beep-page message, the specific sub-frame of UE in specific radio frames detects the beep-page message that belongs to this UE.All the other time UE can carry out DRX (Discontinuous Reception, discontinuous reception) transmission, mean that UE can close receiver in all the other times and preserve the energy content of battery.
According to agreement, in FDD system, the subframe position of Paging may be 0,4,5,9 work song frames, and in TDD system, the subframe position of Paging may be 0,1,5,6 work song frames, and concrete subframe occurs that position is relevant according to the concrete configuration of DRX cycle.
In order to guarantee that UE can obtain in time beep-page message under DRX pattern, Paging can not postpone, and also should not leak and send out, and the scheduling of therefore synchronous subframe need to avoid sending the subframe of Paging.
Based on above analysis, can find out that the result of choosing of synchronous subframe initial candidate set is different under the different configurations of LTE.Shown in Fig. 3, be in FDD system, and under the different ratio of uplink subframe to downlink subframe of TDD system, the initial candidate set result obtaining according to above analysis, the selectable location of synchronous subframe is the blank space of subframe position in the drawings.
According to the concrete business scenario of the concrete configuration of Femto community and network, get rid of and in synchronous subframe Candidate Set, be not suitable for the Femto function subframe multiplexing with air interface synchronization, these Femto function subframes may act on the particular application that need to have the transmission of up-downgoing business, and the scheduling of synchronous subframe should be avoided these function subframes.Confirm after these subframe position, upgrade synchronous subframe Candidate Set.
Particularly, can judge now whether synchronous subframe Candidate Set is empty set, if the empty set of being judged as is suitably relaxed Candidate Set judgment condition, upgrades synchronous subframe Candidate Set.If judgement is not empty set, enter step 13.
In concrete enforcement, the mode of choosing of initial candidate set can difference as the case may be change, and the constraints of synchronous subframe Candidate Set also can suitably be adjusted as required.For example, as can be seen from Figure 2, in TDD system ratio of uplink subframe to downlink subframe 0, subframe does not meet above analysis requirement completely, in this case, need to relax according to actual needs the constraints of synchronous subframe, to avoid occurring empty set.
Be unsuitable for carrying out, after the function subframe position of air interface synchronization, synchronous subframe Candidate Set being upgraded evading.The renewal operation of this step also may cause occurring empty set, now need to relax the constraints to synchronous subframe equally, to avoid occurring empty set.
After can being chosen in the synchronous subframe Candidate Set renewal of step 122, unified judgement and the processing of carrying out empty set.
The generation of empty set may be due to constraints harsh causing too, may be also because the above-mentioned value to " special time period " is selected not good.When arranging when too small for carrying out the time period of Candidate Set judgement, also may cause occurring empty set.Therefore,, when determining synchronous subframe initial candidate set, should first guarantee that the candidate's time period arranging is proper.
When needs relax processing to synchronous subframe constraints, should follow certain priority orders.For example, consider that MIB/SIB 1 repeats to send, can consider preferentially to remove this constraints.To different constraints, according to the priority level of prior agreement, sort, from the constraints of lowest priority, start to get rid of item by item, until synchronous subframe Candidate Set is not empty set.
According to the concrete configuration of Femto community and spatial multiplexing gain, selection can with synchronize subframe and carry out multiplexing function subframe.Synchronous subframe and this class subframe are carried out the multiplexing gain bringing in performance, reduce subframe waste.
These reusable function subframes may have following several different situations, including, but not limited to:
The particular application that acting on need to keep mourning in silence etc. can not carry out the transmission of up-downgoing business, as eICIC (Enhanced Inter-Cell Interference Coordination, the Inter-Cell Interference Coordination strengthening) ABS (Almost Blank Subframe, almost blank subframe) that function is disturbed for evading adjacent area.
Act on the application scenario of transmission Cell Broadcast CB/multicast message, as the MBSFN subframe for MBMS transmission.
The position that these subframes occur may with synchronize subframe Candidate Set and occur occuring simultaneously.When synchronous subframe takies the position of this class subframe, can't the enforcement of this class specific function be brought and be had a strong impact on, thus the position that occurs of this class subframe can with synchronize the position of subframe and carry out multiplexing.Synchronous subframe be a class without service subframe, inevitably can reduce the chance that system can be carried out regular traffic scheduling.When synchronous subframe and this class subframe, carry out when multiplexing, can reduce introducing without the service subframe waste to limited system resource, thereby bring the gain in performance.
Especially, when high level disposes MBSFN subframe, also can be when determining synchronous subframe Candidate Set, just the subset using this Candidate Set as the set of MBSFN subframe, is equivalent to increase a Candidate Set constraints.When high level does not configure MBSFN subframe, do not need to consider this constraint.
Specific candidate in the time period, may exist multiple on diverse location be applicable to and synchronize the multiplexing function subframe of subframe, now need multiplexing position to carry out preferably.The preferred process of this step has considered spatial multiplexing gain and multiplexing ageing.
So-called spatial multiplexing gain, specifically refers to reusable function subframe and synchronizes the multiplexing rear influence degree to system original function of subframe, and to Quality degree of effective utilization of system resource etc.Can be from a plurality of different aspect analytical calculation spatial multiplexing gain, including, but not limited to:
Reusable function subframe with synchronize the coincidence degree that subframe send to require control channel.Coincidence degree is higher, and the multiplexing rear impact on control channel is less;
Reusable function subframe with synchronize the degree of compatibility of subframe concrete function.As above-mentioned MBSFN subframe is mainly used in MBMS transmission data, will reduce the transmission of MBMS business after multiplexing, its spatial multiplexing gain is less than and the spatial multiplexing gain of approximate blank ABS subframe.
So-called multiplexing ageing, refer to the moment that reusable function subframe occurs.In order to improve the ageing of cycle synchronisation, each cycle to special time period in the selection of all candidate's subframes, the subframe more early arriving constantly should have higher timeliness priority.
Concrete implement the judgement of Zhong， base station in current Candidate Set, whether exist can be mutually multiplexing with air interface synchronization function subframe, according to court verdict, carry out respective handling:
If exist one can be mutually multiplexing with air interface synchronization function subframe, be chosen for the synchronous subframe in this cycle;
If there are a plurality of function subframes that can be mutually multiplexing with air interface synchronization, need according to above method for optimizing, decision-making goes out multiplexing priority, and chooses reusable subframe that priority the is the highest synchronous subframe as this cycle;
If do not exist can be mutually multiplexing with air interface synchronization function subframe, directly choose in Candidate Set the subframe that occurs at first as the synchronous subframe in this cycle, to carry out as early as possible air interface synchronization, guarantee that air interface synchronization is ageing.
The adaptive air interface synchronization subframe scheduling method that the embodiment of the present invention proposes, no matter whether Femto base station disposes MBSFN subframe, all can optimize adaptively the subframe position that each cycle is carried out air interface synchronization by base station.Base station arranges cycle timer according to the air interface synchronization cycle, after timer expiry, the attribute of following several subframes is analyzed, and adaptive decision-making goes out the position of synchronous subframe.
Femto base station synchronization subframe adaptive scheduling computational methods described in the employing embodiment of the present invention, compared with prior art, are not only applicable to configure the network design scene of MBSFN subframe, are applicable to the high-rise situation that does not configure MBSFN subframe yet.The synchronous subframe self-adapting dispatching method that the embodiment of the present invention proposes, it is flexible to join synchronizing cycle, both be applicable to FDD system, also be applicable to the various up-downgoing proportioning patterns of TDD system, synchronous subframe scheduling mode is convenient, is beneficial to realization, and has taken into full account the mode compatible with other function of Femto, the compatibility that can greatly strengthen air interface synchronization and other function of Femto base station, is conducive to the lifting of systematic function.
Fig. 4 is the schematic diagram of device of the scheduling air interface synchronization subframe of the embodiment of the present invention, as shown in 43, comprising:
The first module, for determining that each cycle can be used for dispatching the special time segment length of synchronous subframe;
The second module, for determining the Candidate Set of the synchronous subframe in this cycle;
The 3rd module, for selecting the synchronous subframe in this cycle from described Candidate Set.
Wherein, described the second module is according to one or more in following constraints, to determine the Candidate Set of the synchronous subframe in this cycle:
In tdd systems, only choose descending sub frame as synchronous subframe;
The subframe at master sync signal place is not as synchronous subframe;
The subframe at auxiliary synchronous signals place is not as synchronous subframe;
Send the subframe of Master Information Block not as synchronous subframe;
The subframe of transmitting system block of information is not as synchronous subframe;
Send the subframe of beep-page message not as synchronous subframe.
Wherein, described the second module, according to after the one or more definite Candidate Set in constraints also for, get rid of in described Candidate Set and be not suitable for the function subframe multiplexing with air interface synchronization, upgrade described Candidate Set.
Described the second module, determine or also upgrade after Candidate Set for, according to the described constraints of default priority, the subframe in described Candidate Set is carried out to self adaptation adjustment.
Wherein, described the 3rd module, subframe that can be multiplexing with air interface synchronization specifically for selection from described Candidate Set is as the subframe of synchronizeing in this cycle; As described in there are a plurality of subframes that can be multiplexing with air interface synchronization in Candidate Set, according to default multiplexing priority, select optimum subframe in the described Candidate Set synchronous subframe as this cycle; As described in do not exist in Candidate Set can be mutually multiplexing with air interface synchronization subframe, choose the subframe that occurs at first in the described Candidate Set synchronous subframe as this cycle.
The embodiment of the present invention also provides a kind of base station, comprises 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 said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
These are only the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (11)
1. a method of dispatching air interface synchronization subframe, comprising:
Determine that each cycle can be used for dispatching the special time period of synchronous subframe;
According to the base attribute of all subframes in above-mentioned special time period, determine the Candidate Set of the synchronous subframe in this cycle;
From described Candidate Set, select the synchronous subframe in this cycle.
2. method as claimed in claim 1, is characterized in that: describedly determine that the Candidate Set of the synchronous subframe in this cycle comprises:
According to one or more in following constraints, determine Candidate Set:
In tdd systems, only choose descending sub frame as synchronous subframe;
The subframe at master sync signal place is not as synchronous subframe;
The subframe at auxiliary synchronous signals place is not as synchronous subframe;
Send the subframe of Master Information Block not as synchronous subframe;
The subframe of transmitting system block of information is not as synchronous subframe;
Send the subframe of beep-page message not as synchronous subframe.
3. method as claimed in claim 2, is characterized in that: described according to after the one or more definite Candidate Set in constraints, also comprise:
Get rid of in described Candidate Set and be not suitable for the function subframe multiplexing with air interface synchronization, upgrade described Candidate Set.
4. method as described in claim 2 or 3, is characterized in that: described determine or upgrade Candidate Set after, also comprise:
According to default constraint priority, the subframe in described Candidate Set is carried out to self adaptation adjustment.
5. method as described in claim 1-3 any one, is characterized in that: from described Candidate Set, select the synchronous subframe in this cycle to comprise:
The subframe that selection can be multiplexing with air interface synchronization from described Candidate Set is as the subframe of synchronizeing in this cycle;
As described in there are a plurality of subframes that can be multiplexing with air interface synchronization in Candidate Set, according to default multiplexing priority, select optimum subframe in the described Candidate Set synchronous subframe as this cycle;
As described in do not exist in Candidate Set can be mutually multiplexing with air interface synchronization subframe, choose the subframe that occurs at first in the described Candidate Set synchronous subframe as this cycle.
6. a device of dispatching air interface synchronization subframe, comprising:
The first module, for determining that each cycle can be used for dispatching the special time segment length of synchronous subframe;
The second module, for determining the Candidate Set of the synchronous subframe in this cycle;
The 3rd module, for selecting the synchronous subframe in this cycle from described Candidate Set.
7. install as claimed in claim 6, it is characterized in that:
Described the second module is to determine Candidate Set according to one or more in following constraints:
In tdd systems, only choose descending sub frame as synchronous subframe;
The subframe at master sync signal place is not as synchronous subframe;
The subframe at auxiliary synchronous signals place is not as synchronous subframe;
Send the subframe of Master Information Block not as synchronous subframe;
The subframe of transmitting system block of information is not as synchronous subframe;
Send the subframe of beep-page message not as synchronous subframe.
8. install as claimed in claim 7, it is characterized in that:
Described the second module, according to after the one or more definite Candidate Set in constraints also for, get rid of in described Candidate Set and be not suitable for the function subframe multiplexing with air interface synchronization, upgrade described Candidate Set.
9. as described in claim 7 or 8, install, it is characterized in that:
Described the second module, determine or also upgrade after Candidate Set for, according to default constraint priority, the subframe in described Candidate Set is carried out to self adaptation adjustment.
10. as described in claim 6-8 any one, install, it is characterized in that:
Described the 3rd module, subframe that can be multiplexing with air interface synchronization specifically for selection from described Candidate Set is as the subframe of synchronizeing in this cycle; As described in there are a plurality of subframes that can be multiplexing with air interface synchronization in Candidate Set, according to default multiplexing priority, select subframe in the described Candidate Set synchronous subframe as this cycle; As described in do not exist in Candidate Set can be mutually multiplexing with air interface synchronization subframe, choose the subframe that occurs at first in the described Candidate Set synchronous subframe as this cycle.
11.Yi Zhong base station, comprises the device as described in claim 1-10 any one.
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