CN102045711A - Inter-base-station null interface synchronization tracking method and base station equipment in LTE system - Google Patents
Inter-base-station null interface synchronization tracking method and base station equipment in LTE system Download PDFInfo
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Abstract
The invention discloses an inter-base-station null interface synchronization tracking method and base station equipment in a long term evolution (LTE) system, which aim to solve the problem of inter-base-station synchronizing signal interference in the null interface synchronization tracking process. The inter-base-station null interface synchronization tracking method in the LTE system comprises the following steps that: a base station determines a first radio frame allocation offset parameter corresponding to the clock level of the base station and a second radio frame allocation offset parameter corresponding to the previous clock level of the clock level of the base station according to the correspondence relation between the clock level configured by the system and the radio frame allocation offset parameters; the base station performs null interface interception on a multicast/broadcast single frequency network (MBSFN) subframe of a first radio frame determined according to the first radio frame allocation offset parameter and performs null interface synchronization tracking on synchronizing signals acquired by interception; and the base station performs coordinated silencing on an MBSFN subframe of a second radio frame determined according to the second radio frame allocation offset parameter.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to air interface synchronization tracking and base station equipment between the base station in a kind of LTE system.
Background technology
3GPP (3rd Generation Partnership Project, 3G (Third Generation) Moblie standardization body) has started Long Term Evolution (Long Term Evolution, standardization effort LTE).(its subcarrier spacing is set at 15kHz for Orthogonal Frequency Division Multiplex, OFDM) technology, and corresponding OFDM symbol lengths is 66.67us based on OFDM in the LTE system.The LTE system comprises TDD (Time Division Duplex, time division duplex) and two kinds of duplex modes of FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)).For TDD (Time Division Duplex, time division duplex) the LTE system of mode, time synchronized between the different base station is the prerequisite and the basis of its reliability service, the LTE system of each tdd mode in the prior art, TD-LTE (TD-SCDMALong Term Evolution, the Long Term Evolution of TD-SCDMA for example; TD-SCDMA:Time Division-Synchronous CDMA, TD SDMA inserts) system, all consider based on the time synchronized between GPS (Global Positioning System, global positioning system) the timing signal realization different base station.
Yet, to a kind of important website femto (femto base station) that quietly rises in the mobile communication system in the near future, because it is deployed in indoor, be difficult for obtaining the GPS timing signal, therefore under the TDD mode, time synchronized is to realize a significant challenge of femto base station deployment between between the femto base station and femto base station and the macro (macro base station).
The air interface synchronization scheme is a kind of feasible program that solves time synchronized between the femto base station.So-called air interface synchronization is meant: by intercepting the synchronizing signal of seed base station (synchronous base station), the clock of adjusting self makes it be synchronized with the clock of seed base station (to need synchronous base station) from the base station.The air interface synchronization scheme can adopt open loop air interface synchronization and closed loop air interface synchronization dual mode.Be that example is introduced open loop air interface synchronization and two kinds of implementations of closed loop air interface synchronization respectively with the TD-LTE system below.
Open loop air interface synchronization mode comprises the steps:
Step 1: intercept and catch the PSS (primary sync signal, master sync signal) of seed base station from the base station, carry out Frequency Synchronization and Phase synchronization according to PSS;
Step 2: intercept and catch the SSS (secondary sync signal, auxiliary synchronous signals) of seed base station from the base station, carry out frame regularly synchronously according to SSS, and the PCI of identification macro base station sub-district (Physical Cell ID, Physical Cell Identifier symbol);
Step 3: periodically intercept and catch the PSS and/or the SSS of seed base station from the base station, perhaps CRS (common pilot signal) carries out air interface synchronization and follows the tracks of.
Closed loop air interface synchronization mode comprises the steps:
Step 1: intercept and catch the PSS of seed base station from the base station, carry out Frequency Synchronization and Phase synchronization according to PSS;
Step 2: intercept and catch the SSS of seed base station from the base station, carry out frame regularly synchronously according to SSS, and the PCI of identification macro base station sub-district;
Step 3: send at random the request of access from the base station to the seed base station, and by the seed base station to from base station feedback TA (Timing Advance, timing advance) parameter, according to TA parameter correction frame regularly from the base station;
Step 4: periodically intercept and catch the PSS and/or the SSS of seed base station from the base station, perhaps CRS carries out air interface synchronization and follows the tracks of.
Above-mentioned air interface synchronization scheme adopts point-to-point synchronization mechanism, need be to the pre-configured seed base station from the base station.Because the deployment operator of femto base station is also not exclusively controlled, so the air interface synchronization scheme needs the femto base station can be according to the seed base station or the seed collection of base stations of the adaptively selected the best of network environment, and synchronous with it.A kind of effective means that realizes this target is the clock stratum mechanism of introducing in the air interface synchronization scheme.That is: macro base station and femto base station all have static state or the attribute that can dynamically adjust is the clock rank, and wherein 0 grade is the highest ranking of clock stratum, and 1 grade is taken second place, and the like.After the start of femto base station, at first intercept wireless network environment, if do not detect any adjacent macro base station or femto base station, then select motor synchronizing, clock stratum is set at 0 grade; If detect adjacent macro base station or femto base station, the base station of then selecting clock stratum the highest (that is: rank sequence number minimum) is the seed base station as the synchronous base of self, sets the clock stratum low one-level of the clock stratum of self than this seed base station simultaneously.
Based on above-mentioned clock stratum mechanism, the air interface synchronization jumping figure can obtain minimum control in the system.The clock stratum principle as shown in Figure 1 can motor synchronizing after the start of base station 1, and to set clock stratum be 0 grade, and all can listen to 0 grade of adjacent clock after base station 2, base station 3 and base station 4 starts, and is therefore all synchronous with base station 1, and the clock stratum of setting self is 1 grade.Be not difficult to find: the clock stratum scheme makes the synchronization link ordering in the system, and the clock stratum of the base station absolute value of difference that is adjacent the clock stratum of base station is not more than 1 arbitrarily.
No matter above-mentioned air interface synchronization scheme is to adopt open loop air interface synchronization mode or closed loop air interface synchronization mode all can be divided into two processes, and air interface synchronization is set up process and air interface synchronization tracing process.For open loop air interface synchronization mode, step 1 and step 2 belong to air interface synchronization and set up process, and step 3 belongs to the air interface synchronization tracing process; For closed loop air interface synchronization mode, step 1 to step 3 belongs to air interface synchronization and sets up process, and step 4 belongs to the air interface synchronization tracing process.Set up process for air interface synchronization, femto intercepts the base station PSS and the SSS of macro base station or other femto base station.LTE system for the TDD mode, eat dishes without rice or wine to intercept schematic diagram as shown in Figure 2, as HeNB (femto base station) when eating dishes without rice or wine to intercept, can not be simultaneously to its UE emission PSS and SSS, because be 1ms minimum dispatching cycle (TTI) in the LTE system, i.e. 1 subframe, this just means that UE not only can lose PSS and SSS when eating dishes without rice or wine to intercept in the femto base station of its access, also can lose PBCH, because PBCH obtains by resolving PSS and SSS.For these reasons, set up process for air interface synchronization, because UE does not also insert the femto base station, therefore air interface synchronization set up femto in the process intercept the base station PSS of seed base station and SSS to UE without any influence, and for the air interface synchronization tracing process, can UE be impacted, so the air interface synchronization tracing process generally is not inclined to and intercepts PSS and/or SSS.In order to ensure the eating dishes without rice or wine to intercept UE is had no effect of femto base station, the air interface synchronization tracing process relatively tends to intercept the CRS (common pilot signal) of MBSFN subframe.Because the MBSFN subframe can not be the subframe that comprises special control channel (PSS/SSS/PBCH), therefore eat dishes without rice or wine to intercept UE without any influence at MBSFN subframe place.
The deployment operator that a significant challenge of air interface synchronization scheme is exactly the femto base station is uncontrollable, and deployed position at random.Can be subjected to the serious interference of other femto base station when for above-mentioned reasons, eating dishes without rice or wine to intercept in a certain femto base station.As shown in Figure 3, when HeNB1 (femto base station) intercepts the synchronizing signal of its seed base station eNB (macro base station), HeNB2 is not in the state of intercepting, therefore the synchronizing signal of HeNB2 emission can cause interference to HeNB1, and especially interference is very serious when HeNB2 and HeNB1 position are nearer.
Cooperation (Coordinated Silencing) mechanism of mourning in silence is the effective means that overcomes the problems referred to above.Be that example describes equally with Fig. 3, cooperation is mourned in silence and is meant that when HeNB1 intercepted the synchronizing signal of its seed base station eNB, HeNB2 did not do any processing, neither be in the state of intercepting and also do not launch synchronizing signal, so between the femto base station also just without any interference.But the behavior of femto base station at random, and how each femto base station collaboration is mourned in silence or eated dishes without rice or wine and intercepts in the control system, disturbs and become the technical problem that needs to be resolved hurrily in the prior art to solve synchronizing signal between the base station.
Summary of the invention
The invention provides the air interface synchronization tracking between the base station in a kind of LTE system, in order to solve the synchronizing signal interference problem between the base station in the air interface synchronization tracing process.
The invention provides the air interface synchronization tracking between the base station in a kind of LTE system, comprising:
The base station is according to the corresponding relation of the clock stratum of system configuration and radio frames configuration skew radioframeAllocationOffset parameter, determines the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of a radioframeAllocationOffset of self clock stratum correspondence and self clock stratum;
Described base station eats dishes without rice or wine to intercept at the Multicast Broadcast Single Frequency Network MBSFN subframe place of first radio frames of determining according to a described radioframeAllocationOffset parameter, carries out air interface synchronization according to the synchronizing signal of intercepting and capturing and follows the tracks of; And
Mourn in silence in the cooperation of the MBSFN subframe place of second radio frames of determining according to described the 2nd radioframeAllocationOffset parameter in described base station.
The invention provides the base station equipment in a kind of LTE system, comprise memory cell, determining unit, control unit, eat dishes without rice or wine to intercept the unit, mourned in silence in the unit in tracking cell and cooperation synchronously, wherein:
Described memory cell is used for the clock stratum of storage system configuration and the corresponding relation of radio frames configuration skew radioframeAllocationOffset parameter;
Described determining unit, be used for according to described corresponding relation, determine the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of radioframeAllocationOffset of base station equipment self clock stratum correspondence and base station equipment self clock stratum;
Described control unit, be used for Multicast Broadcast Single Frequency Network MBSFN subframe place in first radio frames of determining according to a described radioframeAllocationOffset parameter, trigger the described unit of eating dishes without rice or wine to intercept, at the MBSFN subframe place of second radio frames of determining according to described the 2nd radioframeAllocationOffset parameter, trigger the described cooperation unit of mourning in silence;
Describedly eat dishes without rice or wine to intercept the unit, be used under the triggering of described control unit, eating dishes without rice or wine to intercept;
Described synchronous tracking cell is used for carrying out air interface synchronization according to the synchronizing signal of intercepting and capturing and follows the tracks of;
The described cooperation unit of mourning in silence is used for cooperating under the triggering of described control unit and mourns in silence.
Air interface synchronization tracking and base station equipment in the LTE provided by the invention system between the base station, the base station is according to the clock stratum of system configuration and the corresponding relation of radioframeAllocationOffset parameter, determine a radioframeAllocationOffset of self clock stratum correspondence, and the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of self clock stratum, the base station eats dishes without rice or wine to intercept at the MBSFN subframe place of first radio frames of determining according to a radioframeAllocationOffset parameter, mourns in silence in the cooperation of the MBSFN subframe place of second radio frames of determining according to the 2nd radioframeAllocationOffset parameter.Because arbitrarily the clock stratum of the base station absolute value of difference that is adjacent the clock stratum of base station is not more than 1, base station by adjacent clock stratum in the air interface synchronization tracing process mutually cooperation mourn in silence/eat dishes without rice or wine and intercept, can effectively improve the q﹠r of air interface synchronization, solve since the femto base station be deployed in the synchronizing signal interference problem that is caused in the air interface synchronization tracing process at random.
Description of drawings
Fig. 1 is a clock stratum schematic diagram in the prior art;
Fig. 2 eats dishes without rice or wine to intercept schematic diagram for the LTE system of TDD mode in the prior art;
Fig. 3 eats dishes without rice or wine to intercept the interference schematic diagram in the prior art;
Fig. 4 mourns in silence/eats dishes without rice or wine the interception system Organization Chart for cooperating in the embodiment of the invention;
Fig. 5 mourns in silence/schematic diagram of eating dishes without rice or wine to intercept for control cooperation in the embodiment of the invention;
Fig. 6 is the air interface synchronization tracking flow chart between the base station in the LTE system in the embodiment of the invention;
Fig. 7 is the structured flowchart of base station equipment in the LTE system in the embodiment of the invention.
Embodiment
At first introduce MBSFN (Multicast Broadcast SingleFrequency Network, Multicast Broadcast Single Frequency Network) the sub-frame configuration mode that defines in the LTE standard criterion.The MBSFN period of sub-frame has possible configuration in 6, that is: 1 frame, 2 frames, 4 frames, 8 frames, 16 frames and 32 frames, and the configuration parameter that uses is radioframeAllocationPeriod (radio frames configuration cycle, be called for short the frame period) parameter.In a frame period, framing bit is equipped with 8 kinds of possible configurations, that is: offset 0,1,2,3,4,5,6,7 in the frame period, and the configuration parameter that uses is radioframeAllocationOffset (radio frames configuration skew is called for short vertical shift) parameter.If SFN (System Frame Number, System Frame Number) to carry out the radioframeAllocationOffset parameter of the operation result of Mod (asking mould) computing and configuration consistent with the radioframeAllocationPeriod parameter, and the current wireless frame promptly comprises the MBSFN subframe so.The implication of asking modular arithmetic is to get the remainder of gained behind two integral divides.
Determine that MBSFN has two kinds of Bitmap (bitmap) configuration mode in the position of frame in the radio frames:
The oneFrame mode: promptly only comprise the MBSFN subframe in the current wireless frame, the BitMap (bitmap) of total 6bit, if among the BitMap certain be that the subframe of 1 this correspondence of expression is the MBSFN subframe.For TDD mode and FDD mode, the subframe position of everybody correspondence is as shown in table 1 among the BitMap.
Table 1
| BitMap | 0 | 1 | 2 | 3 | 4 | 5 |
| FDD | Subframe 1 | Subframe 2 | Subframe 3 | Subframe 6 | Subframe 7 | Subframe 8 |
| TDD | Subframe 3 | Subframe 4 | Subframe 7 | Subframe 8 | |
?- |
The fourFrame mode: promptly all comprise the MBSFN subframe in initial continuous four frames of current wireless frame, the therefore BitMap of total 24bit, if among the BitMap certain be that the subframe of 1 this correspondence is the MBSFN subframe.For TDD mode and FDD mode, everybody can analogize from table 1 corresponding subframe position among the BitMap.For example: under the FDD mode, the subframe 1,2,3,6,7,8 in corresponding first radio frames in the 0-5 position among the BitMap; 6-11 position among the BitMap, the subframe 1,2,3,6,7 in corresponding second radio frames, the rest may be inferred for 8....Under the TDD mode, because configurable MBSFN subframe than FDD few in each radio frames, so in the BitMap of 24bit, last 4 is untapped for the TDD mode.
Based on above-mentioned MBSFN sub-frame configuration mode, the embodiment of the invention has at first proposed a kind of cooperation and has mourned in silence/eat dishes without rice or wine and intercept controlling mechanism, that is: the corresponding different respectively radioframeAllocationOffset in other base station of different clocks level.According to different radioframeAllocationPeriod configurations and BitMap configuration, effectively therefore the radioframeAllocationOffset difference can also have nothing in common with each other by corresponding clock stratum.In the oneFrame mode is example, and the effective radioframeAllocationOffset and the clock stratum of different radioframeAllocationPeriod configuration correspondences are as shown in table 2.
Table 2
| Frame period | The BitMap configuration mode | Vertical shift | Clock stratum |
| 1 | oneFrame | 0 | 0，1 |
| 2 | oneFrame | 0，1 | 0，1，2 |
| 4 | oneFrame | 0，1，2，3 | 0，1，2，3，4 |
| 8 | oneFrame | 0，1，2，3，4，5，6，7 | 0，1，2，3，4，5，6，7，8 |
| 16 | oneFrame | 0，1，2，3，4，5，6，7 | 0，1，2，3，4，5，6，7，8 |
| 32 | oneFrame | 0，1，2，3，4，5，6，7 | 0，1，2，3，4，5，6，7，8 |
How that clock stratum and radioframeAllocationOffset parameter is corresponding mutually illustrate below, and other base station collaboration of control different clocks level is mourned in silence/is eated dishes without rice or wine and intercepts.For example, the frame period is 8, and the oneFrame mode is adopted in the BitMap configuration, has 8 kinds of possible radioframeAllocationOffset when then disposing the MBSFN subframe.Because clock stratum is 0 grade base station, does not need to intercept the synchronizing signal of other any base station, just do not need to dispose the MBSFN subframe yet, therefore 8 kinds of radioframeAllocationOffset parameters can corresponding 9 kinds of clock stratum, be assumed to be 0-8,0 grade the highest, and 8 grades minimum.With the cooperation shown in Figure 4 interception system framework of mourning in silence/eat dishes without rice or wine is example explanation, suppose in the current system clock stratum minimum be 3 grades, the clock stratum of eNB is 0 grade; The clock stratum of HeNB1 is 1 grade, and its seed base station is eNB; The clock stratum of HeNB2 is 2 grades, and its seed base station is HeNB1; The clock stratum of HeNB3 is 3 grades, and its seed base station is HeNB2.The schematic diagram of controlling cooperation to mourn in silence/eating dishes without rice or wine to intercept as shown in Figure 5, if the operation result of the SFN mod ramdioframeAllocationPeriod of current wireless frame is 0, then clock stratum is that 1 grade base station (herein for HeNB1) eats dishes without rice or wine to intercept at the MBSFN of current wireless frame subframe place, and this moment, clock stratum was that 2 grades base station (being HeNB2 herein) cooperation is mourned in silence; If operation result is 1, then clock stratum is that 2 grades base station (herein for HeNB2) eats dishes without rice or wine to intercept at the MBSFN of current wireless frame subframe place, and this moment, clock stratum was that 3 grades base station (being HeNB3 herein) cooperation is mourned in silence; If operation result is 2, then clock stratum is that 3 grades base station (herein for HeNB3) eats dishes without rice or wine to intercept at the MBSFN of current wireless frame subframe place and since in the current system clock stratum minimum be 3 grades, therefore do not need the base station collaboration of other clock stratum to mourn in silence.
Need to prove, only needing to set up one-to-one relationship between clock stratum and radioframeAllocationOffset parameter gets final product, specifically how correspondence can not limit, for example: the radioframeAllocationOffset parameter is 0, can corresponding 1 grade of clock, arbitrary grade of clock outside also can corresponding other 0 grade of clock.Concrete which subframe that adopts also can retrain as the MBSFN subframe in this external radio frames, that is to say, the MBSFN subframe in the corresponding radio frames in other base station of different clocks level can be a same sub, also can be different subframes.
Based on above analysis, the embodiment of the invention provides the air interface synchronization tracking between the base station in a kind of LTE system, preferable, each base station keeps SFN synchronous in the requirement LTE system, for the SFN that realizes each base station in the LTE system synchronous, the PBCH (Physical BroadcastChannel, Physical Broadcast Channel) of its seed base station is intercepted in each base station, and according to the SFN of the seed base station current wireless frame that the captures SFN of self current wireless frame synchronously.The air interface synchronization of this method between base station and its seed base station carried out after setting up and finishing, and as shown in Figure 6, specifically comprises the steps:
S601, base station be according to the clock stratum of system configuration and the corresponding relation of radioframeAllocationOffset parameter, determines the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of a radioframeAllocationOffset of self clock stratum correspondence and self clock stratum;
S602, base station eat dishes without rice or wine to intercept at the MBSFN subframe place of first radio frames of determining according to a radioframeAllocationOffset parameter of self clock stratum correspondence, carry out air interface synchronization according to the synchronizing signal of intercepting and capturing and follow the tracks of.
At the MBSFN of first radio frames subframe place, the corresponding subframe of the seed base station of this base station can be common subframe (Regular subframe), common subframe is meant the non-MBSFN subframe that does not comprise special control channel (PSS/SSS/PBCH), the synchronizing signal that then captures can be CRS, also can be used for the synchronizing signal of eating dishes without rice or wine to intercept for other.Provide explanation for common subframe, see also table 1, under the TDD mode, subframe 3, subframe 4, subframe 7, subframe 8, subframe 9 all can be configured to the MBSFN subframe, that is to say that subframe 3, subframe 4, subframe 7, subframe 8, subframe 9 all do not comprise special control channel, if subframe 3 is configured to the MBSFN subframe, then subframe 4, subframe 7, subframe 8, subframe 9 can be called common subframe.
At the MBSFN of first radio frames subframe place, the corresponding subframe of the seed base station of this base station also can be the MBSFN subframe, and the synchronizing signal that then captures can be CRS, also can be used for the synchronizing signal of eating dishes without rice or wine to intercept for other.
S603, base station mourn in silence in the MBSFN subframe place cooperation of second radio frames of determining according to the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of self clock stratum, that is to say that neither being in the state of intercepting does not launch synchronizing signal yet.
Need to prove that S602 and S603 have just provided concrete number of steps for convenience of description, in fact there is no strict sequential relationship between two steps.
In concrete the enforcement, when arrive in each radio frames in the base station, carry out the Mod computing according to the SFN and the radioframeAllocationPeriod parameter of current wireless frame;
If the radioframeAllocationOffset parameter that operation result is corresponding with self clock stratum is consistent, then the current wireless frame is defined as first radio frames, corresponding, the base station eats dishes without rice or wine to intercept at the MBSFN of current wireless frame subframe place;
If the 2nd radioframeAllocationOffset parameter that operation result is corresponding with the upper level clock stratum of self clock stratum is consistent, then the current wireless frame is defined as second radio frames, accordingly, cooperate at the MBSFN of current wireless frame subframe place and mourn in silence in the base station;
If the radioframeAllocationOffset parameter that the radioframeAllocationOffset parameter that operation result is corresponding with self clock stratum and the upper level clock stratum of self clock stratum are corresponding is all inconsistent, accordingly, corresponding operating is carried out according to prior art in the base station.
In concrete the enforcement, equipment of the core network is carried at each base station that is broadcast in the system configuration message in the system with the corresponding relation and the radioframeAllocationPeriod parameter of clock stratum and radioframeAllocationOffset parameter, described equipment of the core network can be the network management device in the core net, MSC (Mobile Switching Center, mobile switching centre) etc.; This corresponding relation and this radioframeAllocationPeriod parameter are extracted and preserve in each base station from the system configuration message that receives.
Based on same technical conceive, the embodiment of the invention provides the base station equipment in the LTE system, preferable, require in this system each base station to keep system frame number SFN synchronous, as shown in Figure 7, this base station equipment comprises memory cell 700, determining unit 701, control unit 702, eats dishes without rice or wine to intercept unit 703, tracking cell 704 and cooperation synchronously mourned in silence unit 705, wherein:
Memory cell 700 is used for the clock stratum of storage system configuration and the corresponding relation of radioframeAllocationOffset parameter;
Determining unit 701, be used for corresponding relation, determine the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of radioframeAllocationOffset of base station equipment self clock stratum correspondence and base station equipment self clock stratum according to clock stratum and radioframeAllocationOffset parameter;
Control unit 702, be used for MBSFN subframe place in first radio frames of determining according to a radioframeAllocationOffset parameter of base station equipment self clock stratum correspondence, triggering eats dishes without rice or wine to intercept unit 703, at the MBSFN subframe place of second radio frames of determining according to the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of base station equipment self clock stratum, trigger the cooperation unit 705 of mourning in silence;
Eat dishes without rice or wine to intercept unit 703, be used under the triggering of control unit 702, eating dishes without rice or wine to intercept;
Tracking cell 704 is used for carrying out air interface synchronization according to the synchronizing signal of intercepting and capturing and follows the tracks of synchronously;
The cooperation unit 705 of mourning in silence is used for cooperating under the triggering of control unit 702 and mourns in silence.
In concrete the enforcement, control unit 702 further can comprise operator unit 7021, control sub unit 7022 and triggering subelement 7023, wherein:
Memory cell 700 also is used to store radio frames configuration cycle radioframeAllocationPeriod parameter;
Operator unit 7021 is used for carrying out the Mod computing according to the SFN and the radioframeAllocationPeriod parameter of current wireless frame when each radio frames arrives;
Control sub unit 7022, be used for the corresponding to current wireless frame of a radioframeAllocationOffset parameter that operation result and base station equipment self clock stratum is corresponding and be defined as first radio frames, the corresponding to current wireless frame of the 2nd radioframeAllocationOffset parameter that the upper level clock stratum of operation result and base station equipment self clock stratum is corresponding is defined as second radio frames;
Trigger subelement 7023, be used for MBSFN subframe place, trigger and eat dishes without rice or wine to intercept unit 703,, trigger the unit 705 of mourning in silence of cooperating at the MBSFN subframe place of second radio frames of determining in first radio frames of determining.
Preferable, this base station equipment also comprises:
Extraction unit 706 is used for extracting the corresponding relation and the radioframeAllocationPeriod parameter of clock stratum and radioframeAllocationOffset parameter and being saved in the memory cell 700 from the system configuration message that equipment of the core network sends.
In the embodiment of the invention, the base station is according to the clock stratum of system configuration and the corresponding relation of radioframeAllocationOffset parameter, determine a radioframeAllocationOffset of self clock stratum correspondence, and the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of self clock stratum, the base station eats dishes without rice or wine to intercept at the MBSFN subframe place of first radio frames of determining according to a radioframeAllocaionOffset parameter, mourns in silence in the cooperation of the MBSFN subframe place of second radio frames of determining according to the 2nd radioframeAllocationOffset parameter.Because arbitrarily the clock stratum of the base station absolute value of difference that is adjacent the clock stratum of base station is not more than 1, base station by adjacent clock stratum in the air interface synchronization tracing process mutually cooperation mourn in silence/eat dishes without rice or wine and intercept, can effectively improve the q﹠r of air interface synchronization, solve since the femto base station be deployed in the synchronizing signal interference problem that is caused in the air interface synchronization tracing process at random.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the air interface synchronization tracking between the base station in the Long Term Evolution LTE system is characterized in that, comprising:
The base station is according to the corresponding relation of the clock stratum of system configuration and radio frames configuration skew radioframeAllocationOffset parameter, determines the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of a radioframeAllocationOffset of self clock stratum correspondence and self clock stratum;
Described base station eats dishes without rice or wine to intercept at the Multicast Broadcast Single Frequency Network MBSFN subframe place of first radio frames of determining according to a described radioframeAllocationOffset parameter, carries out air interface synchronization according to the synchronizing signal of intercepting and capturing and follows the tracks of; And
Mourn in silence in the cooperation of the MBSFN subframe place of second radio frames of determining according to described the 2nd radioframeAllocationOffset parameter in described base station.
2. the method for claim 1 is characterized in that, at the MBSFN of described first radio frames subframe place, the corresponding subframe of the seed base station of described base station is the MBSFN subframe.
3. the method for claim 1 is characterized in that, at the MBSFN of described first radio frames subframe place, the corresponding subframe of the seed base station of described base station is common subframe, and described common subframe is meant the non-MBSFN subframe that does not comprise special control channel.
4. as claim 1,2 or 3 described methods, it is characterized in that definite method of described first radio frames and second radio frames specifically comprises:
When arrive in each radio frames in described base station, ask mould Mod computing according to the SFN and the radio frames configuration cycle radioframeAllocationPeriod parameter of current wireless frame;
The corresponding to current wireless frame of a radioframeAllocationOffset parameter that operation result is corresponding with self clock stratum is defined as first radio frames, and the corresponding to current wireless frame of the 2nd radioframeAllocationOffset parameter that operation result is corresponding with the upper level clock stratum of self clock stratum is defined as second radio frames.
5. method as claimed in claim 4 is characterized in that, also comprises:
The corresponding relation of described clock stratum and radioframeAllocationOffset parameter and described radioframeAllocationPeriod parameter are that extract from the system configuration message of equipment of the core network broadcasting the base station.
6. method as claimed in claim 5 is characterized in that, described equipment of the core network is network management device or the moving exchanging center MSC in the core net.
7. the method for claim 1 is characterized in that, it is synchronous that each base station keeps system frame number SFN in the LTE system.
8. method as claimed in claim 7 is characterized in that, the SFN method for synchronous of each base station in the LTE system specifically comprises:
The Physical Broadcast Channel PBCH of its seed base station is intercepted in each base station, according to the SFN of the seed base station current wireless frame of intercepting and the capturing SFN of self current wireless frame synchronously.
9. the base station equipment in the Long Term Evolution LTE system is characterized in that, comprise memory cell, determining unit, control unit, eat dishes without rice or wine to intercept the unit, mourned in silence in the unit in tracking cell and cooperation synchronously, wherein:
Described memory cell is used for the clock stratum of storage system configuration and the corresponding relation of radio frames configuration skew radioframeAllocationOffset parameter;
Described determining unit, be used for according to described corresponding relation, determine the 2nd radioframeAllocationOffset parameter of the upper level clock stratum correspondence of radioframeAllocationOffset of base station equipment self clock stratum correspondence and base station equipment self clock stratum;
Described control unit, be used for Multicast Broadcast Single Frequency Network MBSFN subframe place in first radio frames of determining according to a described radioframeAllocationOffset parameter, trigger the described unit of eating dishes without rice or wine to intercept, at the MBSFN subframe place of second radio frames of determining according to described the 2nd radioframeAllocationOffset parameter, trigger the described cooperation unit of mourning in silence;
Describedly eat dishes without rice or wine to intercept the unit, be used under the triggering of described control unit, eating dishes without rice or wine to intercept;
Described synchronous tracking cell is used for carrying out air interface synchronization according to the synchronizing signal of intercepting and capturing and follows the tracks of;
The described cooperation unit of mourning in silence is used for cooperating under the triggering of described control unit and mourns in silence.
10. base station equipment as claimed in claim 9 is characterized in that, described control unit further comprises operator unit, control sub unit and triggering subelement, wherein:
Described memory cell also is used to store radio frames configuration cycle radioframeAllocationPeriod parameter;
Described operator unit is used for asking mould Mod computing according to the SFN and the radioframeAllocationPeriod parameter of current wireless frame when each radio frames arrives;
Described control sub unit, be used for the corresponding to current wireless frame of a radioframeAllocationOffset parameter that operation result and base station equipment self clock stratum is corresponding and be defined as first radio frames, the corresponding to current wireless frame of the 2nd radioframeAllocationOffset parameter that the upper level clock stratum of operation result and base station equipment self clock stratum is corresponding is defined as second radio frames;
Trigger subelement, be used for MBSFN subframe place, trigger the described unit of eating dishes without rice or wine to intercept,, trigger the described cooperation unit of mourning in silence at the MBSFN subframe place of second radio frames of determining in first radio frames of determining.
11. base station equipment as claimed in claim 10 is characterized in that, also comprises:
Extraction unit is used for extracting described corresponding relation and described radioframeAllocationPeriod parameter from the system configuration message that equipment of the core network sends, and is saved in the described memory cell.
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| CN102761956A (en) * | 2012-06-29 | 2012-10-31 | 华为技术有限公司 | Network interception synchronization method and device as well as base station |
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| WO2014100982A1 (en) * | 2012-12-26 | 2014-07-03 | 华为技术有限公司 | Air interface synchronization method and apparatus therefor |
| CN105308887A (en) * | 2013-03-15 | 2016-02-03 | Lg电子株式会社 | Method and apparatus for performing synchronization in wireless communication system |
| CN105308887B (en) * | 2013-03-15 | 2018-05-01 | Lg电子株式会社 | Synchronous method and apparatus is performed in a wireless communication system |
| WO2016019515A1 (en) * | 2014-08-05 | 2016-02-11 | Nokia Solutions And Networks Oy | Controlling synchronization procedure of communication network control elements |
| CN108307497A (en) * | 2017-01-12 | 2018-07-20 | 谷歌有限责任公司 | Base station time offset adjusts |
| CN108307497B (en) * | 2017-01-12 | 2020-11-06 | 谷歌有限责任公司 | Base station time offset adjustment |
| CN110113812A (en) * | 2019-05-27 | 2019-08-09 | 深圳智微电子科技有限公司 | A kind of wireless communication whole network synchronous method based on TD-LTE |
| CN116113033A (en) * | 2023-04-11 | 2023-05-12 | 上海新基讯通信技术有限公司 | Method and system for synchronizing NR system and LTE system |
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