CN103379614A - A method for synchronizing air interfaces of home base stations and base stations - Google Patents
A method for synchronizing air interfaces of home base stations and base stations Download PDFInfo
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Abstract
本发明公开了一种家庭基站的空口同步方法及基站，其中，该方法包括：基准家庭基站接收同步家庭基站的同步接力请求，根据自身的特殊时隙配置为同步家庭基站进行同步接力的时隙配置；基准家庭基站在下行特殊时隙上向同步家庭基站发送同步信号。本发明的家庭基站的空口同步方法和基站，起到基准基站作用的家庭基站在收到接力同步请求后，对特殊时隙进行自适应调整，弥补了原有同步方法只能在有限的场景提供多级同步的缺陷，从而降低干扰，提高整个网络的性能。
The invention discloses an air interface synchronization method of a home base station and a base station, wherein the method includes: a reference home base station receives a synchronization relay request from a synchronous home base station, and configures a time slot for the synchronous home base station to perform synchronization relay according to its own special time slot Configuration: the reference home base station sends a synchronization signal to the synchronous home base station on the downlink special time slot. The air interface synchronization method of the home base station and the base station of the present invention, the home base station functioning as the reference base station, after receiving the relay synchronization request, adaptively adjusts the special time slot, making up for the fact that the original synchronization method can only be provided in limited scenarios Multi-level synchronization of flaws, thereby reducing interference and improving overall network performance.
Description
Technical field
The present invention relates to TD-LTE technology in the communications field, particularly, relate to a kind of method for synchronous and device of the TD-LTE Home eNodeB based on the relay of eating dishes without rice or wine.
Background technology
Home eNodeB as Cellular Networks the replenishing of indoor covering, for the user provides speech and data, services.And the TDD system can produce between nonsynchronous base station and disturb having relatively high expectations synchronously between the base station, particularly causes the interference of TDD up-downgoing cross time-slot, causes network quality to descend.
There are two kinds of situations in the deployment of TD-LTE Home eNodeB, and a kind of is not have grand overlay network or other indoor distributed systems around the Home eNodeB, this moment Home eNodeB other base station synchronizations of can getting along well; Another kind is that one or more Home eNodeB are positioned within the grand covering, if identical networking just must provide method synchronous between the station, make Home eNodeB and macro base station synchronous, and the latter is common deployment scenario.
Outdoor macro base station generally obtains synchronously by the gps satellite navigation system, because Home eNodeB is mainly disposed in indoor environment, is difficult for obtaining gps signal, and therefore the method for synchronous for Home eNodeB need to be provided.
Existing Home eNodeB mainly contains dual mode synchronously: the synchronous and air interface synchronization of line clock.The synchronously present main mode of line clock is to adopt the IEEE1588V2 agreement, and equipment at different levels and the Home eNodeB of this major requirement transmission network are all supported this agreement; Air interface synchronization mainly comprise GPS synchronously or with the air interface synchronization of macro base station, GPS synchronously in the deployment scenario of Home eNodeB, under the indoor environment gps signal weak and even be difficult to obtain, cause the engineering construction difficulty, cost is high.The below introduces the Home eNodeB of at present employing and the aerial method of synchronization of macro base station.
As shown in Figure 1, Home eNodeB can by intercept the downlink synchronous signal of adjacent macro base station, set up synchronously and follow the tracks of synchronously, thereby acquisition and macro base station be synchronous synchronously.Concrete step is as follows:
1. set up synchronously: Home eNodeB adopts and the on all four process of terminal Cell searching (comprise primary and secondary synchronization signals catch uplink random access and timing advance adjustment), with macro base station set up synchronous, referring to Fig. 2;
2. follow the tracks of synchronously: the synchronizing signal of Home eNodeB periodic acquisition macro base station, carry out synchroballistic, to eliminate the cumulative effect of timing error.
Because when following the tracks of synchronously, Home eNodeB need in continual service, periodically receive the macro base station signal.In the prior art, the synchronous tracking of Home eNodeB and macro base station mainly relies on catches the CRS (cell reference signals) in DwPTS (descending special time slot) special subframe.As shown in Figure 3, CRS (cell reference signals) interts in data symbol, and the position in subframe is 0,4,7, No. 11 OFDM symbols.
For continual service, synchronising base station must be at protection time slot (being GP), to being caught by the CRS of synchronising base station.As shown in Figure 4, if macro base station adopts configuration 4 (Con4), during namely 12: 1: 1 time slot proportion, the special time slot configuration of Home eNodeB can be for disposing 2, namely 10: 3: 1 time slot proportion.In this example, Home eNodeB is on the 2nd OFDM character position of GP time slot, owing to there are not the needs of transmission or receiving terminal signal, so can intercept last OFDM symbol (this OFDM symbol has CRS to send) of the DwPTS special subframe of macro base station in same frame, thereby follow the tracks of synchronously.The Home eNodeB that other are possible and the configuration relation of macro base station can see Table 1, and table 1 is the configuration relation table that Home eNodeB and macro base station are followed the tracks of synchronously.
Table 1
Use the air interface synchronization method of above-mentioned Home eNodeB and macro base station, under the deployment scenario that multistage air interface synchronization demand is arranged, can cause the limited problem of progression of air interface synchronization, as shown in Figure 5.Home eNodeB 1 is positioned at the coverage of macro base station, such as doorway, hall or window limit; And Home eNodeB 2 (be positioned at darker indoor) can receive the signal of Home eNodeB 1, but not in the coverage of macro base station.At this moment, if use above-mentioned air interface synchronization method, only the special time slot at macro base station is configured to dispose 4, and namely 12: 1: 1, the special time slot of Home eNodeB 1 was configured to dispose 2,6 or at 1 o'clock, and Home eNodeB 2 could keep synchronously with Home eNodeB 1.And if macro base station is taked other special time slot configurations, Home eNodeB 2 can't keep synchronously (referring to table 1) with Home eNodeB 1, causes disturbing and hydraulic performance decline.Therefore, need to a kind ofly can under various deployment scenario and special time slot configuration, work, can realize multistage synchronous air interface synchronization method.
Summary of the invention
The objective of the invention is to propose a kind of air interface synchronization method and base station of Home eNodeB for the limited defective of the progression of air interface synchronization in the prior art.
For achieving the above object, according to an aspect of the present invention, provide a kind of air interface synchronization method of Home eNodeB.
Air interface synchronization method according to the Home eNodeB of the embodiment of the invention comprises:
The benchmark Home eNodeB receives the synchronous relay request of synchronous Home eNodeB, is descending special time slot every cycle T with the protection of the part in self special time slot time slot configuration according to self special time slot configuring condition;
The benchmark Home eNodeB sends synchronizing signal to synchronous Home eNodeB on descending special time slot.
In technique scheme, the benchmark Home eNodeB is that the step of descending special time slot specifically comprise every cycle T with the protection of the part in self special time slot time slot configuration according to the special time slot configuring condition of self:
If the special time slot of benchmark Home eNodeB is configured to dispose 5, then is configuration 6, configuration 7 with this special time slot configuration change or disposes 8 every cycle T;
If the special time slot of benchmark Home eNodeB is configured to dispose 0, then is configuration 1, configuration 2, configuration 3 with this special time slot configuration change or disposes 4 every cycle T.
In technique scheme, this cycle T is the time span of N subframe, and N is positive integer.In technique scheme, method also comprises: the benchmark Home eNodeB sends the broadcast message that carries time slot configuration information to the affiliated subdistrict terminal, and the represented time slot configuration of time slot configuration information is the time slot configuration that special time slot does not have change.
In technique scheme, cycle T is included in the synchronous relay request of synchronous Home eNodeB transmission, sends to synchronous Home eNodeB after perhaps being determined by the benchmark Home eNodeB.
For achieving the above object, according to an aspect of the present invention, provide a kind of air interface synchronization method of Home eNodeB.
Air interface synchronization method according to the Home eNodeB of the embodiment of the invention comprises:
Home eNodeB carries out Cell searching synchronously, determines the Reference BTS of synchronous Home eNodeB;
Home eNodeB is according to the special time slot configuration of Reference BTS, for self carrying out the special time slot configuration synchronously;
Home eNodeB is every the cell reference signals of cycle T in the descending special time slot of the protection time slot IT Reference BTS of self synchronously, and foundation is synchronous with Reference BTS.
In technique scheme, Home eNodeB determines that the step of Reference BTS specifically comprises synchronously:
If Home eNodeB is found macro base station in co-frequency neighbor cell synchronously, determine that then this macro base station is Reference BTS;
Home eNodeB is according to the special time slot configuration of Reference BTS, for the step of self carrying out the special time slot configuration specifically comprises synchronously:
If the special time slot of macro base station is configured to dispose 4, then Home eNodeB is configuration 1, configuration 2 or disposes 6 every the special time slot configuration change of cycle T with self synchronously;
If the special time slot of macro base station is configured to other configuration, then Home eNodeB is configuration 0 or disposes 5 every the special time slot configuration change of cycle T with self synchronously.In technique scheme, Home eNodeB determines that the step of Reference BTS specifically comprises synchronously:
If Home eNodeB is not found macro base station and found the benchmark Home eNodeB in co-frequency neighbor cell synchronously, determine that then this benchmark Home eNodeB is Reference BTS;
Home eNodeB is according to the special time slot configuration of Reference BTS, for the step of self carrying out the special time slot configuration specifically comprises synchronously:
If the special time slot of benchmark Home eNodeB is configured to dispose 1, configuration 2 or dispose 6, then synchronously Home eNodeB every cycle T with self special time slot configuration change for configuration 0 or dispose 5;
If the special time slot of benchmark Home eNodeB is configured to dispose 0 or dispose 5, method also comprises:
Home eNodeB issues synchronous relay request to the benchmark Home eNodeB synchronously.In technique scheme, this cycle T is the time span of N subframe, and N is positive integer.
For achieving the above object, according to another aspect of the present invention, provide a kind of benchmark Home eNodeB.
Benchmark Home eNodeB according to the embodiment of the invention comprises:
Receiving configuration module, be used for receiving the synchronous relay request of synchronous Home eNodeB, is descending special time slot every cycle T with the part protection time slot configuration in self special time slot according to self special time slot configuring condition;
The time slot sending module is used for sending synchronizing signal to synchronous Home eNodeB on descending special time slot.
In technique scheme, receive configuration module and comprise:
The configuration determination submodule is used for the special time slot configuration of judgment standard Home eNodeB;
Submodule is finished in configuration, is used for the judged result according to the configuration determination submodule, every cycle T this special time slot is configured: if special time slot is configured to dispose 5, then is configuration 6, configuration 7 with this special time slot configuration change or disposes 8 every cycle T;
If special time slot is configured to dispose 0, then is configuration 1, configuration 2, configuration 3 with this special time slot configuration change or disposes 4 every cycle T.
In technique scheme, the benchmark Home eNodeB also comprises:
The broadcast transmission module is used for sending the broadcast message that carries time slot configuration information to the affiliated subdistrict terminal.
For achieving the above object, according to another aspect of the present invention, provide a kind of synchronous Home eNodeB.
Synchronous Home eNodeB according to the embodiment of the invention comprises:
The search determination module is used for carrying out Cell searching, determines the Reference BTS of synchronous Home eNodeB;
The time slot configuration module is used for the special time slot configuration according to Reference BTS, carries out the special time slot configuration;
The signal capture module is used for every the cell reference signals of cycle T at the descending special time slot of the protection time slot IT Reference BTS of synchronous Home eNodeB, and foundation is synchronous with Reference BTS.
In technique scheme, the search determination module specifically comprises:
Submodule is determined in the base station, if be used for finding macro base station at co-frequency neighbor cell, determines that then this macro base station is Reference BTS;
The time slot configuration module comprises:
The configuration determination submodule is used for judging the special time slot configuration of macro base station;
Submodule is finished in configuration, be used for the judged result according to the configuration determination submodule, be configured every the special time slot of cycle T with synchronous Home eNodeB: if the special time slot of macro base station is configured to dispose 4, then is configuration 1, configuration 2 or disposes 6 every the special time slot configuration change of cycle T with synchronous Home eNodeB;
If the special time slot of macro base station is configured to other configuration, then is configuration 0 or disposes 5 every the special time slot configuration change of cycle T with synchronous Home eNodeB.
In technique scheme, the search determination module specifically comprises:
Submodule is determined in the base station, if be used for not finding macro base station and finding the benchmark Home eNodeB at co-frequency neighbor cell, determines that then this benchmark Home eNodeB is Reference BTS;
The time slot configuration module comprises:
The configuration determination submodule is used for the special time slot configuration of judgment standard Home eNodeB;
Submodule is finished in configuration, be used for the judged result according to the configuration determination submodule, be configured every the special time slot of cycle T with synchronous Home eNodeB: if the special time slot of benchmark Home eNodeB is configured to dispose 1, configuration 2 or dispose 6, then every cycle T with the special time slot configuration change of synchronous Home eNodeB for configuration 0 or dispose 5;
The time slot configuration module comprises:
Relay issues submodule, is configured to dispose 0 or dispose 5 if be used for the special time slot of benchmark Home eNodeB, issues synchronous relay request to the benchmark Home eNodeB.
The air interface synchronization method of Home eNodeB of the present invention, benchmark Home eNodeB and synchronous Home eNodeB, be the method that multistage air interface synchronization can be provided for the TDD system under various deployment scenario, wherein, play the Home eNodeB of Reference BTS effect after receiving the relay synchronization request, special time slot is carried out the self adaptation adjustment, and its major advantage is as follows:
1. remedy original method for synchronous multistage synchronous defective can only be provided in limited scene, disturbed thereby reduce, improved the performance of whole network.
2. only take the GP time slot owing to the relay time slot, and transmit without any other useful signals at the GP time slot, so the throughput of Home eNodeB is not affected.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the aerial synchronous structural representation according to Home eNodeB in the prior art and macro base station;
Fig. 2 is the aerial flow chart of setting up synchronously process according to Home eNodeB in the prior art and macro base station;
Fig. 3 is according to the CRS reference signal distribution map in Home eNodeB in the prior art and the synchronously tracking of macro base station;
Fig. 4 is according to Home eNodeB in the prior art and the synchronous schematic diagram of following the tracks of of macro base station;
Fig. 5 is the structural representation according to multistage air interface synchronization in the prior art;
Fig. 6 is the structural representation according to the multistage air interface synchronization of the embodiment of the invention;
Fig. 7 is the simultaneous operation schematic flow sheet according to embodiment of the invention Home eNodeB A;
Fig. 8 adjusts schematic diagram in the special time slot cycle of the synchronous relay according to the present invention;
Fig. 9 is for providing relay synchronous schematic flow sheet according to embodiment of the invention Home eNodeB B;
Figure 10 is the structural representation according to embodiment of the invention benchmark Home eNodeB;
Figure 11 is the structural representation according to the synchronous Home eNodeB of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
For guaranteeing under the various complicated deployment scenario that the TD-LTE Home eNodeB can both obtain synchronously by unified mode, and multistage synchronous ability particularly is provided, the present invention proposes a kind of method for synchronous based on the relay of eating dishes without rice or wine for the TDD system.This method is adjusted into " relay time slot " as required by the special time slot with Home eNodeB, make the Home eNodeB can be under the configuration of special time slot arbitrarily, can both provide synchronizing signal to other Home eNodeB, be about to synchronously " relay " to other Home eNodeB, realize the multistage synchronous of Home eNodeB.In " relay time slot ", the configuration of UpPTS is constant, and original part GP is configured to DwPTS, like this so that other Home eNodeB can listen in the GP position of self CRS of DwPTS, thereby obtains synchronously.Terminal is not also known the existence of relay time slot, and (after adjusting newly-increased DwPTS position) do not receive or send any signal namely in former GP position, therefore can work by original mode.
Embodiment of the method
A kind of air interface synchronization method of Home eNodeB is provided according to an aspect of the present invention.
Air interface synchronization method according to the Home eNodeB of the embodiment of the invention comprises:
The benchmark Home eNodeB receives the synchronous relay request of synchronous Home eNodeB, is descending special time slot every cycle T with the protection of the part in self special time slot time slot configuration according to self special time slot configuring condition;
The benchmark Home eNodeB sends synchronizing signal to synchronous Home eNodeB on descending special time slot.
In technique scheme, the benchmark Home eNodeB is that the step of descending special time slot specifically comprise every cycle T with the protection of the part in self special time slot time slot configuration according to the special time slot configuring condition of self:
If the special time slot of benchmark Home eNodeB is configured to dispose 5, then is configuration 6, configuration 7 with this special time slot configuration change or disposes 8 every cycle T;
If the special time slot of benchmark Home eNodeB is configured to dispose 0, then is configuration 1, configuration 2, configuration 3 with this special time slot configuration change or disposes 4 every cycle T.
In technique scheme, this cycle T is the time span of N subframe, and N is positive integer.In technique scheme, method also comprises: the benchmark Home eNodeB sends the broadcast message that carries time slot configuration information to the affiliated subdistrict terminal, and the represented time slot configuration of time slot configuration information is the time slot configuration that special time slot does not have change.
In technique scheme, cycle T is included in the synchronous relay request of synchronous Home eNodeB transmission, sends to synchronous Home eNodeB after perhaps being determined by the benchmark Home eNodeB.
The air interface synchronization method of another kind of Home eNodeB is provided according to another aspect of the present invention.
Air interface synchronization method according to the Home eNodeB of the embodiment of the invention comprises:
Home eNodeB carries out Cell searching synchronously, determines the Reference BTS of synchronous Home eNodeB;
Home eNodeB is according to the special time slot configuration of Reference BTS, for self carrying out the special time slot configuration synchronously;
Home eNodeB is every the cell reference signals of cycle T in the descending special time slot of the protection time slot IT Reference BTS of self synchronously, and foundation is synchronous with Reference BTS.
In technique scheme, Home eNodeB determines that the step of Reference BTS specifically comprises synchronously:
If Home eNodeB is found macro base station in co-frequency neighbor cell synchronously, determine that then this macro base station is Reference BTS;
Home eNodeB is according to the special time slot configuration of Reference BTS, for the step of self carrying out the special time slot configuration specifically comprises synchronously:
If the special time slot of macro base station is configured to dispose 4, then Home eNodeB is configuration 1, configuration 2 or disposes 6 every the special time slot configuration change of cycle T with self synchronously;
If the special time slot of macro base station is configured to other configuration, then Home eNodeB is configuration 0 or disposes 5 every the special time slot configuration change of cycle T with self synchronously.In technique scheme, Home eNodeB determines that the step of Reference BTS specifically comprises synchronously:
If Home eNodeB is not found macro base station and found the benchmark Home eNodeB in co-frequency neighbor cell synchronously, determine that then this benchmark Home eNodeB is Reference BTS;
Home eNodeB is according to the special time slot configuration of Reference BTS, for the step of self carrying out the special time slot configuration specifically comprises synchronously:
If the special time slot of benchmark Home eNodeB is configured to dispose 1, configuration 2 or dispose 6, then synchronously Home eNodeB every cycle T with self special time slot configuration change for configuration 0 or dispose 5;
If the special time slot of benchmark Home eNodeB is configured to dispose 0 or dispose 5, method also comprises:
Home eNodeB issues synchronous relay request to the benchmark Home eNodeB synchronously.In technique scheme, this cycle T is the time span of N subframe, and N is positive integer.
According to the embodiment of the invention, a kind of air interface synchronization method of Home eNodeB is provided, shown in Fig. 6-7, present embodiment comprises:
Step 102: Home eNodeB A carries out Cell searching when start, find co-frequency neighbor cell; The base station of co-frequency neighbor cell may be macro base station according to all kinds of deployment scenario of A, also may be Home eNodeB;
Step 104: Home eNodeB A is preferential set up with macro base station synchronously, if do not search macro base station, then set up with Home eNodeB B synchronously; The process of setting up synchronously adopts and the on all four process of terminal Cell searching (comprise primary and secondary synchronization signals catch uplink random access and timing advance adjustment), and the source base station that comes of synchronizing signal is referred to as Reference BTS;
Step 106: Home eNodeB A is according to the special time slot configuration of Reference BTS, determine the special time slot configuration of self: if the special time slot of Reference BTS is configured to dispose 4, then self special time slot is configured to dispose 2,6 or 1, if the special time slot of Reference BTS is configured to all the other configurations, then self special time slot is configured to dispose 5 or dispose 0;
Step 108: if Reference BTS is macro base station, then Home eNodeB A carries out synchronization by the CRS signal in the DwPTS special time slot of intercepting Reference BTS;
In step 108, if the special time slot of macro base station is configured to dispose 4, then the special time slot of Home eNodeB A is configured to dispose 2,6 or 1, if the special time slot of macro base station is configured to all the other configurations, then the special time slot of Home eNodeB A is configured to dispose 5 or dispose 0;
Step 110: if Reference BTS is Home eNodeB B, and the special time slot of B is configured to dispose 2, configuration 6 or dispose 1, and then Home eNodeB A carries out synchronization by the CRS signal in the DwPTS special time slot of intercepting Reference BTS; At this moment, the special time slot of Home eNodeB A is configured to dispose 0 or dispose 5, and the special time slot of macro base station is configured to dispose 4;
Step 112: if Home eNodeB A finds that Reference BTS is Home eNodeB B, but the special time slot of Home eNodeB B is configured to 5 or 0, then initiates a relay synchronization request to Home eNodeB B, and this request can be passed through:
Step 1122: Home eNodeB A is by eating dishes without rice or wine or X2 interface sends demand signalling to Home eNodeB B; Or,
Step 1124: Home eNodeB A initiates a request to network management system, by network management system to signaling under the Home eNodeB B;
Step 114: after Home eNodeB B received the relay synchronization request of Home eNodeB A, according to the special time slot configuration of self, for Home eNodeB A carries out synchronous relay, as shown in Figure 9, concrete grammar was as follows:
Step 1142: if the special time slot of Home eNodeB B is configured to dispose 5, namely 3: 9: 2 o'clock, then Home eNodeB B sexually revises the special time slot configuration cycle of self for disposing 8 (or 7, or 6), as shown in Figure 8, cycle T can be long for every subframe long (10ms) or N subframe, namely disposes 8 (or 7 every N subframe (10ms) use special time slot, or 6), N is positive integer; The special time slot that changes configuration is called " relay time slot ", in the relay time slot, does not send control or traffic signaling to conventional terminal;
Step 1144: if the special time slot of Home eNodeB B is configured to 0, namely 3: 10: 1 o'clock, then Home eNodeB B sexually revises special time slot configuration cycle for disposing 4 (or 3,2,1), cycle T can be long for every subframe long (10ms) or N subframe, namely disposes 4 (or 3 every N subframe (10ms) use special time slot, 2,1);
Step 1146: Home eNodeB B will the special time slot configuration broadcast be original configuration (configuration 5 or 0) in the broadcast message to this cell terminal, and terminal still receives according to original mode of operation like this; And at the relay time slot, terminal thinks that should be GP on newly-increased DwPTS position, does not therefore do any reception or transmit operation, thereby does not affect the normal operation of terminal;
Step 1148: Home eNodeB B is to a Home eNodeB A configuration successful of feedback or failed feedback;
Step 1149: the value of relay slot cycle T can be to be included in Home eNodeB A in the relay synchronization request signaling of Home eNodeB B, also can be determined by Home eNodeB B, then feed back to Home eNodeB A, concrete value needs to determine according to the synchronization ability of Home eNodeB and demand;
Step 116: after Home eNodeB A receives that the synchronous relay of Home eNodeB B is successfully fed back, by cycle N receives Home eNodeB B in the GP position of self DwPTS signal, follow the tracks of synchronously and compensate, to eliminate the cumulative effect of timing error.
Need to prove that in the above-mentioned steps 112,114,116, Home eNodeB A and Home eNodeB B are undertaken by information interaction synchronously.Another kind of optional scheme is that if the mode of operation of Home eNodeB B is special time slot 5 or 0, just acquiescence is opened synchronous relay pattern, uses the cycle T of acquiescence, carries out work according to the mode of step 1144 and 1146; The mode of operation that Home eNodeB A detects Home eNodeB B is special time slot 5 or 0, just adopts the cycle T of acquiescence at the DwPTS signal of the GP position reception Home eNodeB B of self, follows the tracks of synchronously and compensates, to eliminate the cumulative effect of timing error.
The air interface synchronization method of Home eNodeB of the present invention, be the method that multistage air interface synchronization can be provided for the TDD system under various deployment scenario, wherein, play the Home eNodeB of Reference BTS effect after receiving the relay synchronization request, special time slot is carried out the self adaptation adjustment, and its major advantage is as follows:
1. remedy original method for synchronous and can only provide multistage synchronous defective limited scene (being configured to dispose 4 such as the macro base station special time slot), disturbed thereby reduce, improved the performance of whole network.
2. only take the GP time slot owing to the relay time slot, and transmit without any other useful signals at the GP time slot, so the throughput of Home eNodeB is not affected.
Device embodiment
According to the embodiment of the invention, provide a kind of benchmark Home eNodeB.As shown in figure 10, present embodiment comprises:
Receiving configuration module 10, be used for receiving the synchronous relay request of synchronous Home eNodeB, is descending special time slot every cycle T with the part protection time slot configuration in self special time slot according to self special time slot configuring condition;
Time slot sending module 20 is used for sending synchronizing signal to synchronous Home eNodeB on descending special time slot.
Receiving configuration module 10 comprises:
If special time slot is configured to dispose 0, then is configuration 1, configuration 2, configuration 3 with this special time slot configuration change or disposes 4 every cycle T.
The benchmark Home eNodeB also comprises:
Broadcast transmission module 30 is used for sending the broadcast message that carries time slot configuration information to the affiliated subdistrict terminal.
According to the embodiment of the invention, provide a kind of synchronous Home eNodeB.As shown in figure 11, present embodiment comprises:
Search determination module 40 is used for carrying out Cell searching, determines the Reference BTS of synchronous Home eNodeB;
Time slot configuration module 50 is used for the special time slot configuration according to Reference BTS, carries out the special time slot configuration;
Signal capture module 60 is used for every the cell reference signals of cycle T at the descending special time slot of the protection time slot IT Reference BTS of synchronous Home eNodeB, and foundation is synchronous with Reference BTS.
Search determination module 40 specifically comprises:
Submodule 41 is determined in the base station, if be used for finding macro base station at co-frequency neighbor cell, determines that then this macro base station is Reference BTS;
Time slot configuration module 50 comprises:
Configuration determination submodule 51 is used for judging the special time slot configuration of macro base station;
Submodule 52 is finished in configuration, be used for the judged result according to the configuration determination submodule, be configured every the special time slot of cycle T with synchronous Home eNodeB: if the special time slot of macro base station is configured to dispose 4, then is configuration 1, configuration 2 or disposes 6 every the special time slot configuration change of cycle T with synchronous Home eNodeB;
If the special time slot of macro base station is configured to other configuration, then is configuration 0 or disposes 5 every the special time slot configuration change of cycle T with synchronous Home eNodeB.
Search determination module 40 specifically comprises:
Submodule 41 is determined in the base station, if be used for not finding macro base station and finding the benchmark Home eNodeB at co-frequency neighbor cell, determines that then this benchmark Home eNodeB is Reference BTS;
Time slot configuration module 50 comprises:
Configuration determination submodule 51 is used for the special time slot configuration of judgment standard Home eNodeB;
Submodule 52 is finished in configuration, be used for the judged result according to the configuration determination submodule, be configured every the special time slot of cycle T with synchronous Home eNodeB: if the special time slot of benchmark Home eNodeB is configured to dispose 1, configuration 2 or dispose 6, then every cycle T with the special time slot configuration change of synchronous Home eNodeB for configuration 0 or dispose 5;
Time slot configuration module 50 also comprises:
Relay issues submodule 53, is configured to dispose 0 or dispose 5 if be used for the special time slot of benchmark Home eNodeB, issues synchronous relay request to the benchmark Home eNodeB.
Benchmark Home eNodeB of the present invention and synchronous Home eNodeB are the base station that multistage air interface synchronization can be provided for the TDD system under various deployment scenario; Benchmark Home eNodeB of the present invention and synchronous Home eNodeB on the not impact of existing terminal, and can compatiblely have terminal now, and on macro base station also not impact; At network side, need in benchmark Home eNodeB and synchronous Home eNodeB, add corresponding functional module, and not need newly-increased radio frequency or transceiver module; Wherein, the benchmark Home eNodeB carries out the self adaptation adjustment to special time slot after receiving the relay synchronization request, and its major advantage is as follows:
1. remedy original method for synchronous and can only provide multistage synchronous defective limited scene (being configured to dispose 4 such as the macro base station special time slot), disturbed thereby reduce, improved the performance of whole network.
2. only take the GP time slot owing to the relay time slot, and transmit without any other useful signals at the GP time slot, so the throughput of Home eNodeB is not affected.
The present invention can have multiple multi-form embodiment; the above as an example of Fig. 6-Figure 11 example by reference to the accompanying drawings to technical scheme of the present invention explanation for example; this does not also mean that the applied instantiation of the present invention can only be confined in specific flow process or the example structure; those of ordinary skill in the art should understand; the specific embodiments that above provides is some examples in the multiple its preferred usage, and the execution mode of any embodiment claim of the present invention all should be within technical solution of the present invention scope required for protection.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment the present invention is had been described in detail, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. the air interface synchronization method of a Home eNodeB is characterized in that, comprising:
The benchmark Home eNodeB receives the synchronous relay request of synchronous Home eNodeB, is descending special time slot every cycle T with the protection of the part in self special time slot time slot configuration according to self special time slot configuring condition;
Described benchmark Home eNodeB sends synchronizing signal to described synchronous Home eNodeB on descending special time slot.
2. method according to claim 1 is characterized in that, the benchmark Home eNodeB is that the step of descending special time slot specifically comprise every cycle T with the protection of the part in self special time slot time slot configuration according to the special time slot configuring condition of self:
If the special time slot of benchmark Home eNodeB is configured to dispose 5, then is configuration 6, configuration 7 with this special time slot configuration change or disposes 8 every cycle T;
If the special time slot of benchmark Home eNodeB is configured to dispose 0, then is configuration 1, configuration 2, configuration 3 with this special time slot configuration change or disposes 4 every cycle T.
3. method according to claim 1 and 2 is characterized in that, this cycle T is the time span of N subframe, and N is positive integer.
4. method according to claim 1 and 2, it is characterized in that, also comprise: described benchmark Home eNodeB sends the broadcast message that carries time slot configuration information to the affiliated subdistrict terminal, and the represented time slot configuration of described time slot configuration information is the time slot configuration that special time slot does not have change.
5. method according to claim 3 is characterized in that, described cycle T is included in the synchronous relay request of synchronous Home eNodeB transmission, sends to synchronous Home eNodeB after perhaps being determined by the benchmark Home eNodeB.
6. the air interface synchronization method of a Home eNodeB is characterized in that, comprising:
Home eNodeB carries out Cell searching synchronously, determines the Reference BTS of described synchronous Home eNodeB;
Described synchronous Home eNodeB is according to the special time slot configuration of described Reference BTS, for self carrying out the special time slot configuration;
Home eNodeB is every the cell reference signals of cycle T in the descending special time slot of the described Reference BTS of protection time slot IT of self synchronously, and foundation is synchronous with described Reference BTS.
7. method according to claim 6 is characterized in that, Home eNodeB determines that the step of Reference BTS specifically comprises synchronously:
If Home eNodeB is found macro base station in co-frequency neighbor cell synchronously, determine that then this macro base station is Reference BTS;
Described synchronous Home eNodeB is according to the special time slot configuration of described Reference BTS, for the step of self carrying out the special time slot configuration specifically comprises:
If the special time slot of described macro base station is configured to dispose 4, then described synchronous Home eNodeB is configuration 1, configuration 2 or disposes 6 every the special time slot configuration change of cycle T with self;
If the special time slot of described macro base station is configured to other configuration, then described synchronous Home eNodeB is configuration 0 or disposes 5 every the special time slot configuration change of cycle T with self.
8. method according to claim 6 is characterized in that, Home eNodeB determines that the step of Reference BTS specifically comprises synchronously:
If Home eNodeB is not found macro base station and found the benchmark Home eNodeB in co-frequency neighbor cell synchronously, determine that then this benchmark Home eNodeB is Reference BTS;
Described synchronous Home eNodeB is according to the special time slot configuration of described Reference BTS, for the step of self carrying out the special time slot configuration specifically comprises:
If the special time slot of described benchmark Home eNodeB is configured to dispose 1, configuration 2 or dispose 6, then described synchronous Home eNodeB every cycle T with self special time slot configuration change for configuration 0 or dispose 5;
If the special time slot of described benchmark Home eNodeB is configured to dispose 0 or dispose 5, method also comprises:
Described synchronous Home eNodeB issues synchronous relay request to the benchmark Home eNodeB.
9. the described method of any one is characterized in that according to claim 6-8, and this cycle T is the time span of N subframe, and N is positive integer.
10. a benchmark Home eNodeB is characterized in that, comprising:
Receiving configuration module, be used for receiving the synchronous relay request of synchronous Home eNodeB, is descending special time slot every cycle T with the part protection time slot configuration in self special time slot according to self special time slot configuring condition;
The time slot sending module is used for sending synchronizing signal to described synchronous Home eNodeB on descending special time slot.
11. benchmark Home eNodeB according to claim 10 is characterized in that, described reception configuration module comprises:
The configuration determination submodule is used for the special time slot configuration of judgment standard Home eNodeB;
Submodule is finished in configuration, is used for the judged result according to the configuration determination submodule, every cycle T this special time slot is configured: if special time slot is configured to dispose 5, then is configuration 6, configuration 7 with this special time slot configuration change or disposes 8 every cycle T;
If special time slot is configured to dispose 0, then is configuration 1, configuration 2, configuration 3 with this special time slot configuration change or disposes 4 every cycle T.
12. benchmark Home eNodeB according to claim 10 is characterized in that, also comprises:
The broadcast transmission module is used for sending the broadcast message that carries time slot configuration information to the affiliated subdistrict terminal.
13. a synchronous Home eNodeB is characterized in that, comprising:
The search determination module is used for carrying out Cell searching, determines the Reference BTS of described synchronous Home eNodeB;
The time slot configuration module is used for the special time slot configuration according to described Reference BTS, carries out the special time slot configuration;
The signal capture module is used for every the cell reference signals of cycle T at the descending special time slot of the described Reference BTS of protection time slot IT of synchronous Home eNodeB, and foundation is synchronous with described Reference BTS.
14. synchronous Home eNodeB according to claim 13 is characterized in that, described search determination module specifically comprises:
Submodule is determined in the base station, if be used for finding macro base station at co-frequency neighbor cell, determines that then this macro base station is Reference BTS;
Described time slot configuration module comprises:
The configuration determination submodule is used for judging the special time slot configuration of macro base station;
Submodule is finished in configuration, be used for the judged result according to the configuration determination submodule, be configured every the special time slot of cycle T with synchronous Home eNodeB: if the special time slot of described macro base station is configured to dispose 4, then is configuration 1, configuration 2 or disposes 6 every the special time slot configuration change of cycle T with synchronous Home eNodeB;
If the special time slot of described macro base station is configured to other configuration, then is configuration 0 or disposes 5 every the special time slot configuration change of cycle T with synchronous Home eNodeB.
15. synchronous Home eNodeB according to claim 13 is characterized in that, described search determination module specifically comprises:
Submodule is determined in the base station, if be used for not finding macro base station and finding the benchmark Home eNodeB at co-frequency neighbor cell, determines that then this benchmark Home eNodeB is Reference BTS;
Described time slot configuration module comprises:
The configuration determination submodule is used for the special time slot configuration of judgment standard Home eNodeB;
Submodule is finished in configuration, be used for the judged result according to the configuration determination submodule, be configured every the special time slot of cycle T with synchronous Home eNodeB: if the special time slot of described benchmark Home eNodeB is configured to dispose 1, configuration 2 or dispose 6, then every cycle T with the special time slot configuration change of synchronous Home eNodeB for configuration 0 or dispose 5;
Described time slot configuration module also comprises:
Relay issues submodule, is configured to dispose 0 or dispose 5 if be used for the special time slot of described benchmark Home eNodeB, issues synchronous relay request to the benchmark Home eNodeB.
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| WO2016000142A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Clock synchronization method, system and related device |
| CN105519026A (en) * | 2014-01-17 | 2016-04-20 | 富士通株式会社 | Interaction method for synchronization between cells, apparatus and communication system |
| CN105636234A (en) * | 2014-10-27 | 2016-06-01 | 中兴通讯股份有限公司 | Station opening method, base station, base station controller and station opening system |
| CN105917711A (en) * | 2014-12-24 | 2016-08-31 | 华为技术有限公司 | Communication system, base station and clock synchronization method |
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| CN105519026B (en) * | 2014-01-17 | 2020-01-07 | 富士通株式会社 | Inter-cell synchronization interaction method, device and communication system |
| CN104812049A (en) * | 2014-01-24 | 2015-07-29 | 中国移动通信集团公司 | Method and equipment for synchronization between base stations |
| 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 |
| WO2016000142A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Clock synchronization method, system and related device |
| CN105636234A (en) * | 2014-10-27 | 2016-06-01 | 中兴通讯股份有限公司 | Station opening method, base station, base station controller and station opening system |
| CN105917711A (en) * | 2014-12-24 | 2016-08-31 | 华为技术有限公司 | Communication system, base station and clock synchronization method |
| CN105917711B (en) * | 2014-12-24 | 2019-11-19 | 华为技术有限公司 | Communication system, base station and clock synchronizing method |
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| CN103379614B (en) | 2016-12-07 |
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