CN102026363A - Base station internal synchronization method of hierarchical system and base station - Google Patents
Base station internal synchronization method of hierarchical system and base station Download PDFInfo
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- CN102026363A CN102026363A CN2009102354442A CN200910235444A CN102026363A CN 102026363 A CN102026363 A CN 102026363A CN 2009102354442 A CN2009102354442 A CN 2009102354442A CN 200910235444 A CN200910235444 A CN 200910235444A CN 102026363 A CN102026363 A CN 102026363A
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Abstract
The invention discloses a base station internal synchronization method of a hierarchical system and a base station. The method comprises the following steps of: synchronizing the base station in a synchronous position in the configuration information of a second multicast/broadcast single frequency network subframe; submitting the configuration modification of a first multicast/broadcast single frequency network subframe to a network administer when the base station confirms that the configuration of the first multicast/broadcast single frequency network subframe is modified or submitting the configuration modification of the first multicast/broadcast single frequency network subframe to the network administer when the base station confirms that the configuration modification of the first multicast/broadcast single frequency network subframe can influence a second multicast/broadcast single frequency network subframe in the synchronous position; and synchronizing the base station in a synchronous position in the configuration information of a third multicast/broadcast single frequency network subframe, wherein the configuration information of the third multicast/broadcast single frequency network subframe is distributed by the network administer according to the configuration modification of the first multicast/broadcast single frequency network subframe. The invention provides a synchronization scheme with backward compatibility.
Description
Technical field
The present invention relates to moving communicating field, inter-sync method in particularly a kind of hierarchical system base station and base station.
Background technology
In mobile communications network, along with growing requirement to data speed and covering, traditional provides the method for access can not meet the demands with macro base station, adopt cell splitting, and can be good at addressing this is that at hot zones or some lower powered base stations of indoor deployment (Home/Pico/Femto/Relay, family base station/Pico cell formula base station/femtocell formula base station/midsequent base station).This lower powered base station is a kind of base station equipment that is applied under family's indoor environment, working environment or other the little overlay environment, can make operator that high data rate, attractive business more cheaply are provided more.
The introducing meeting of low power base station causes interference to the communication of existing macro base station, and when low power base station is asynchronous with macro base station, this interference will be especially serious, therefore, needs to solve low power base station and the synchronous problem of macro base station,
In 3GPP R8 (version 8) system, for the radius of society less than 3KM, the required precision of synchronization among base stations is 3us, and for the radius of society greater than 3KM, the required precision of synchronization among base stations is 10us.In 3GPP R9/10 (version 9/10) system, because the application of new technologies and methods, keep seeming even more important synchronously between the base station, in present research, mainly there are following several synchronous schemes:
Scheme one: GPS (Global Positioning System, global positioning system) is synchronous.
This scheme be go via satellite to set up between the base station synchronously, it is the most frequently used scheme that keeps synchronous between the macro base station at present, synchronous precision can reach several us, but shortcoming is the power that is subjected to satellite-signal synchronously easily, the influence of weather and landform, such as indoor may just can't receive strong satellite-signal, and the cost of user terminal is higher, need equipment GPS receiver, be not applicable to hierarchical network very much.
Scheme two: network inter-sync.
This synchronization scenario needs the base station to remove to increase some hardware resources to go to carry out synchronously, the base station need be under the complete state of a control of network in addition, consider HeNB (Home eNB, family evolution base station) should be a low-cost device and incomplete controlled characteristic, this method also is little being suitable for for hierarchical network.
(UE is auxiliary for scheme three: UE-assistant; UE:User Equipment, subscriber equipment) scheme.
In this scheme, the user terminal especially user terminal in the overlapping region need go to carry out frequent measurement and information reports, keep between the base station synchronously, this scheme can realize distributed control, but the signaling consumption of network will be very big, and the power consumption of user terminal also can be very big.
Scheme four: inter-sync between the base station.
This scheme is present many schemes of research, mainly be by between the base station by certain mechanism realize mutual synchronously.For example have company to propose the inter-sync method in a kind of hierarchical system base station: promptly certain base station can keep synchronous by the monitoring another one CRS of synchronising base station (Cell-specific referencesignals, the exclusive pilot signal in sub-district) signal.Make the problem that to consider interference in this way, Fig. 1 is a hierarchical system base station inter-sync scheme schematic diagram, as shown in the figure: when eNB1 when monitoring the synchronizing signal of eNB0, if eNB2 is when carrying out transfer of data, the synchronizing signal that will influence eNB1 so receives.
Appearance under the circumstances, the said firm also proposes to solve with a kind of mode of mourning in silence: promptly carrying out synchronizing signal when monitoring as eNB1, eNB2 does not transmit data and avoids interference.This scheme may need the mutual coordination between the base station.
In addition, consider the influence of some communication environments, some Home base station (family base station) may not receive the available synchronizing signal from macro base station, and the said firm proposes to utilize the method for synchronous of multi-hop.Fig. 2 is synchronous (Multi-hop synchronization) scheme schematic diagram of multi-hop, and as shown in the figure: HeNB1 is synchronous with macro base station, and HeNB2 can be undertaken by HeNB1 synchronously.Defining SynceNB among the figure (eNB synchronously) is layer 0, and the base station of utilization layer 0 is carried out synchronous base station and is layer 1 (HeNB1), and the base station of utilization layer 1 is carried out synchronous base station and is layer 2 (HeNB2), and the like.
From the angle that interference is avoided, when lower layer was monitored synchronously, the base station of following one deck will stop transmission information to avoid the interference to it.Therefore, can be made into the subframe that each layer needs are mourned in silence the function of the number of plies, synchronizing information is gone to monitor in identical position in the base station of each layer, goes to mourn in silence in same position.Therefore, the base station of each layer need send the information about layer, and at present, whether synchronous the base station will send the number of plies (2 bit) of this base station and information (1 bit).These information can:
Transmission in MIB (Master Information Block, master control block of information);
In SIB-1 (System Information Block-1, system information block 1), transmit.
In the subframe transmission of one deck base station configuration MBSFN (MBSFN Multicast Broadcast Single FrequencyNetwork, multicast/broadcast Single Frequency Network) subframe in order to monitor synchronously down.
Simultaneously, webmaster issues the configuration about the synchronous subframe of each layer.For fear of the influence for the user, these synchronous subframes are to realize by the mode that disposes MBSFN.
At present, in the RAN4 working group that less radio-frequency and Access Network Performance Evaluation are studied, passed through monitoring of the said firm and carried out synchronous scheme about the base station.
Realize that for mutually monitoring between the base station of the said firm synchronous scheme, all base stations all will obtain the situation of the MBSFN sub-frame configuration of the different layers that network management configuration gets off, the base station is done synchronous monitoring or mourn in silence on subframe accordingly according to the own number of plies then.This scheme of the said firm is that the deficiency that the prior art of representative exists is: do not fully take into account LTE (Long Term Evolution, Long Term Evolution)-and R10 (version 10) introduces the variation that brings behind the new network element, and it can not apply to LTE-R10 and introduce situation behind the new network element.
Summary of the invention
Technical problem solved by the invention is to provide inter-sync method in a kind of hierarchical system base station and base station.
Provide a kind of hierarchical system base station inter-sync method in the embodiment of the invention, comprised the steps:
Carry out on the sync bit of base station in the configuration information of the 2nd MBSFN subframe synchronously, the configuration information of described the 2nd MBSFN subframe is that current each layer is used for synchronous MBSFN subframe configuration information;
The base station determines whether a MBSFN sub-frame configuration changes, and the configuration information of a described MBSFN subframe is a base station own service MBSFN sub-frame configuration;
When determining that in the base station MBSFN sub-frame configuration changes, give webmaster in the change with a MBSFN sub-frame configuration, or, when determining that in the base station MBSFN sub-frame configuration change can influence the 2nd MBSFN subframe at sync bit place, give webmaster in the change with a MBSFN sub-frame configuration, or, determine that in the base station MBSFN sub-frame configuration changes in the time of can not influencing the 2nd MBSFN subframe at sync bit place, professional MBSFN configuration is adjusted in base station oneself;
Carry out on the sync bit of base station in the configuration information of the 3rd MBSFN subframe that webmaster returns synchronously, the configuration information of described the 3rd MBSFN subframe is the variation distribution of webmaster according to a MBSFN sub-frame configuration.
Preferably, carry out synchronously on the sync bit of base station in the configuration information of the 2nd MBSFN subframe before, further comprise:
The configuration information of the 2nd MBSFN subframe that base station start back reception webmaster issues;
Base station selectedly carry out synchronous synchronization mechanism.
Preferably, when receiving the 2nd MBSFN subframe configuration information that webmaster issues in start back, base station, during form that this configuration information issues, comprising:
The agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle, and the information of transmission is the positional information of subframe numbers, each layer;
Or the agreement different layers is all uploaded in same subframe, and layer n disposes MBSFN on the position of SFN mod (M*N)=n, and the size of M was provided with according to the update cycle;
Or, the subframe numbers and the positional information of indication different layers.
Preferably, carry out comprising when synchronous according to the synchronization mechanism of its selection:
Read the layer information and the synchronous regime of last layer base station and carry out initial synchronisation, or, carry out initial synchronisation according to the agreement flow process;
After initial synchronisation is finished, keep synchronously by the CRS of monitoring monitoring last layer base station on the sync bit of gateway configuration or by the agreement flow process.
Preferably, when the layer information that reads the last layer base station and Synchronization Status Message are selected synchronisation source, when synchronisation source is in synchronous regime, as synchronous target, and after setting up synchronously, oneself state is designated as synchronously with the strongest one of signal in the synchronous synchronisation source; When not having synchronisation source to be in synchronous regime, from all synchronisation sources, select a strongest synchronous target of conduct of signal, and after setting up synchronously, oneself state is designated as step-out.
Preferably, after keeping synchronously, further comprise:
The base station of the downward one deck in base station sends the layer information and the synchronizing information of base station.
Preferably, the layer information and the synchronizing information of the base station of the downward one deck in base station transmission base station comprise:
The base station is pbs layer information and synchronizing information in MIB or SIB;
Or the base station is used to monitor the subframe position transmission layer information and the synchronizing information of synchronizing information in following one deck base station.
Preferably, use at least 3 bits to come marker information;
Or, increasing new mark domain, described mark domain is used to indicate the type of base station.
Preferably, when using at least 3 bits to come marker information, further comprise:
To use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station to same one deck.
Preferably, described base station is a low power base station.
Preferably, described base station is the family Home base station in the low power base station, or Pico cell formula Pico base station, or femtocell formula Femto base station, or midsequent Relay base station.
A kind of base station also is provided in the embodiment of the invention, has comprised:
Keep synchronously module, be used for carrying out synchronously on the sync bit of the configuration information of the 2nd MBSFN subframe, the configuration information of described the 2nd MBSFN subframe is that current each layer is used for synchronous MBSFN subframe configuration information;
The configuration determination module is used for determining whether a MBSFN sub-frame configuration changes, and the configuration information of a described MBSFN subframe is a base station own service MBSFN sub-frame configuration;
Submit module, be used for when a definite MBSFN sub-frame configuration changes, give webmaster in the change with a MBSFN sub-frame configuration, or, when determining that in the base station MBSFN sub-frame configuration change can influence the 2nd MBSFN subframe at sync bit place, give webmaster in the change with a MBSFN sub-frame configuration;
Synchronous update module is used for carrying out synchronously on the sync bit of the configuration information of the 3rd MBSFN subframe that webmaster returns, and to be webmaster distribute according to the variation of a MBSFN sub-frame configuration configuration information of described the 3rd MBSFN subframe.
Preferably, further comprise:
Receiver module, be used on the sync bit of the configuration information of the 2nd MBSFN subframe, carrying out synchronously before, after start, receive the configuration information of the 2nd MBSFN subframe that webmaster issues;
Synchronization mechanism is selected module, is used to select to carry out synchronous synchronization mechanism.
Preferably, when described receiver module was further used for receiving in start back, base station the 2nd MBSFN subframe configuration information that webmaster issues, the form that this configuration information issues comprised:
The agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle, and the information of transmission is the positional information of subframe numbers, each layer;
Or the agreement different layers is all uploaded in same subframe, and layer n disposes MBSFN on the position of SFN mod (M*N)=n, and the size of M was provided with according to the update cycle;
Or, the subframe numbers and the positional information of indication different layers.
Preferably, described synchronization mechanism selects module to be further used for carrying out synchronously according to the synchronization mechanism of its selection;
Further comprise: initial synchronization module, the layer information and the synchronous regime that are used to read the last layer base station are carried out initial synchronisation, or, carry out initial synchronisation according to the agreement flow process;
Described synchronous maintenance module is further used for after initial synchronisation is finished, and keeps synchronously by the CRS of monitoring monitoring last layer base station on the sync bit of gateway configuration or by the agreement flow process.
Preferably, described initial synchronization module is further used for when the layer information that reads the last layer base station and Synchronization Status Message are selected synchronisation source, when synchronisation source is in synchronous regime,, and after setting up synchronously, oneself state is designated as synchronously as synchronous target with the strongest one of signal in the synchronous synchronisation source; When not having synchronisation source to be in synchronous regime, from all synchronisation sources, select a strongest synchronous target of conduct of signal, and after setting up synchronously, oneself state is designated as step-out.
Preferably, further comprise:
Information sending module is used for after keeping synchronously, and the base station of one deck sends the layer information and the synchronizing information of base station downwards.
Preferably, described information sending module is further used for when the layer information of transmission base station, the base station of downward one deck and synchronizing information, pbs layer information and synchronizing information in MIB or SIB; Or the subframe position that is used to monitor synchronizing information in following one deck base station sends layer information and synchronizing information.
Preferably, described information sending module is further used for using at least 3 bits to come marker information; Or, increasing new mark domain, described mark domain is used to indicate the type of base station.
Preferably, described information sending module is further used at least when using 3 bits to come marker information, will use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station to same one deck.
Preferably, described base station is a low power base station.
Preferably, described base station is the family Home base station in the low power base station, or Pico cell formula Pico base station, or femtocell formula Femto base station, or midsequent Relay base station.
Beneficial effect of the present invention is as follows:
In the invention process process, carry out on the sync bit of base station in the configuration information of the 2nd MBSFN subframe synchronously; When determining that in the base station MBSFN sub-frame configuration changes, give webmaster in the change with a MBSFN sub-frame configuration, or, when determining that in the base station MBSFN sub-frame configuration change can influence the 2nd MBSFN subframe at sync bit place, give webmaster in the change with a MBSFN sub-frame configuration, or, determine that in the base station MBSFN sub-frame configuration changes in the time of can not influencing the 2nd MBSFN subframe at sync bit place, professional MBSFN configuration is adjusted in base station oneself; Carry out on the sync bit of base station in the configuration information of the 3rd MBSFN subframe that webmaster returns synchronously, the configuration information of described the 3rd MBSFN subframe is the variation distribution of webmaster according to a MBSFN sub-frame configuration.Because in the synchronous process of base station maintenance, when needs dynamic-configuration MBSFN information, the synchronous subframe that the base station utilizes webmaster to issue, promptly, utilize the configuration information of the 3rd MBSFN subframe to upgrade, this configuration then is dynamically to adjust according to the change of a MBSFN sub-frame configuration, therefore, implements just can avoid to give the influence that brings synchronously because of dynamic-configuration MBSFN information by such scheme.
Further, carry out synchronously on the sync bit of base station in the configuration information of the 2nd MBSFN subframe before, can further include: start back, base station receives the configuration information of the 2nd MBSFN subframe; Base station selected synchronization mechanism carries out synchronously.Because the base station can select synchronization mechanism,, also can determine current network and should use which kind of synchronization mechanism even therefore after adopting LTE-R10 to introduce the different synchronization mechanism of network element.
Further, when using at least 3 bits to come marker information, can further include: when using at least 3 bits to come marker information, will use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station at same one deck.Mourn in silence in the position that the said firm's scheme requires last layer to be disposed for synchronous MBSFN, and behind new introducing network element, use identical synchronization mechanism and do not use the base station of monitoring this synchronization mechanism between the base station may need not mourn in silence entirely in MBSFN position than bottom, owing to will use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station, handle after therefore can being distinguished to this situation to same one deck.
By foregoing description as seen, the technical scheme of the embodiment of the invention provides a kind of synchronous scheme with backwards compatibility, has designed new flow process to tackle the problem that exists in the present synchronization mechanism.
Description of drawings
Fig. 1 is a hierarchical system base station inter-sync scheme schematic diagram in the background technology;
Fig. 2 is the synchronization scenario schematic diagram of multi-hop in the background technology;
Fig. 3 is the inter-sync method implementing procedure in a hierarchical system base station schematic diagram in the embodiment of the invention;
Fig. 4 is a low power base station synchronization implementation schematic flow sheet in the embodiment of the invention;
Fig. 5 is an architecture of base station schematic diagram in the embodiment of the invention.
Embodiment
The inventor is noticing in the invention process: for monitoring the prior art that the synchronous scheme of realization is representative between with the base station of the said firm mutually, all base stations all will obtain the situation of the MBSFN sub-frame configuration of the different layers that network management configuration gets off, and the base station is done synchronous monitoring or mourn in silence on subframe accordingly according to the own number of plies then.The deficiency that this scheme of the said firm exists is not fully take into account LTE-R10 (version 10) and introduces the variation that brings behind the new network element, mainly shows:
At first, the synchronization mechanism of LTE-R10 introducing network element may be different.Need this moment the indication current network to use which kind of synchronization mechanism.
Secondly, the new network element of introducing may need dynamic-configuration MBSFN information, need realize backhaul (back haul link) interface by configuration MBSFN such as relay (relaying).Accordingly, the synchronous sub-frame configuration that webmaster issues need be upgraded according to the dynamic adjustment of MBSFN, needs design relevant information interaction flow.
In addition, mourning in silence in the position that the said firm's scheme requires last layer to be disposed for synchronous MBSFN, and after newly introducing network element, may need not mourn in silence entirely in the MBSFN position than bottom, therefore, handles after need being distinguished this situation.
At the problems referred to above, the specific embodiment of the present invention is described below in conjunction with accompanying drawing.
Fig. 3 is a hierarchical system base station inter-sync method implementing procedure schematic diagram, as shown in the figure, can comprise the steps: when synchronous carrying out
Carry out on step 301, the sync bit of base station in the configuration information of the 2nd MBSFN subframe synchronously;
In this step, the configuration information of the 2nd MBSFN subframe is that current each layer is used for synchronous MBSFN subframe configuration information.
In this step, the configuration information of a MBSFN subframe is a base station own service MBSFN sub-frame configuration.
Carry out on step 304, the sync bit of base station in the configuration information of the 3rd MBSFN subframe that webmaster returns synchronously, the configuration information of described the 3rd MBSFN subframe is the variation distribution of webmaster according to a MBSFN sub-frame configuration.
In said process, what describe is in the synchronous process of base station maintenance, when needs dynamic-configuration MBSFN information, the synchronous subframe that the base station utilizes webmaster to issue, promptly, utilize the configuration information of the 3rd MBSFN subframe to upgrade, this configuration then is dynamically to adjust according to the change of a MBSFN sub-frame configuration, implements just can avoid to give the influence that brings synchronously because of dynamic-configuration MBSFN information by such scheme.
Describe with the implementation process that adds communication network after the start of base station more below, in the flow process of superincumbent Fig. 3, describe be the base station in keeping synchronously to dynamic-configuration MBSFN information processing, then be that the base station is the implementation of object with a new network element that adds network in the flow process below.
Then, carry out synchronously on the sync bit of base station in the configuration information of the 2nd MBSFN subframe before, can further include:
The configuration information of the 2nd MBSFN subframe that base station start back reception webmaster issues;
Synchronous synchronization mechanism is carried out in base station selected selection.For example, the base station can select the highest synchronization mechanism of precision to carry out synchronously, and at this moment it can judge whether oneself exists high accuracy synchronization mechanisms such as GPS, if exist, then can select these synchronization mechanisms to carry out synchronously.
Because the base station can select synchronization mechanism,, also can determine current network and should use which kind of synchronization mechanism even therefore after adopting LTE-R10 to introduce the different synchronization mechanism of network element.
Concrete, when the 2nd MBSFN subframe configuration information that base station start back reception webmaster issues, the form that this configuration information issues can comprise:
The agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle, and the information of transmission is the positional information of subframe numbers, each layer;
Or the agreement different layers is all uploaded in same subframe, and layer n disposes MBSFN on the position of SFN mod (M*N)=n, and the size of M was provided with according to the update cycle; Wherein, what N represented is always total how many layers, and what M characterized is the cycle of upgrading.SFN mod x is meant of System Frame Number (SFN:systemframe number) x to be made and gets surplus operation.
Or, the subframe numbers and the positional information of indication different layers;
When the base station carries out can comprising when synchronous according to the synchronization mechanism of its selection:
Read the layer information and the synchronous regime of last layer base station and carry out initial synchronisation, or, carry out initial synchronisation according to the agreement flow process;
After initial synchronisation is finished, keep synchronously by the CRS of monitoring monitoring last layer base station on the sync bit of gateway configuration or by the agreement flow process.
In concrete the enforcement, when the layer information that reads the last layer base station and Synchronization Status Message are selected synchronisation source, can be: when synchronisation source is in synchronous regime, as synchronous target, and after setting up synchronously, oneself state is designated as synchronously with the strongest one of signal in the synchronous synchronisation source; When not having synchronisation source to be in synchronous regime, from all synchronisation sources, select a strongest synchronous target of conduct of signal, and after setting up synchronously, oneself state is designated as step-out.
An initiate base station has just entered the synchronous regime in the step 301 through after the above-mentioned steps, and this this moment is in order to allow down the base station of one deck carry out synchronously, the base station also needs itself layer information and synchronizing information are sent, therefore, after keeping synchronously, can further include:
The base station of the downward one deck in base station sends the layer information and the synchronizing information of base station.
In the enforcement, when sending the layer information of base station and synchronizing information in the base station of the downward one deck in base station, the layer information and the synchronizing information of the transmission base station, base station of the downward one deck in base station comprise:
The base station is pbs layer information and synchronizing information in MIB or SIB;
Or the base station is used to monitor the subframe position transmission layer information and the synchronizing information of synchronizing information in following one deck base station.
In concrete the enforcement, can use at least 3 bits to come marker information;
Or, increasing new mark domain, described mark domain is used to indicate the type of base station.
Mourn in silence in the position that the said firm's scheme requires last layer to be disposed for synchronous MBSFN, and after newly introducing network element, may need not mourn in silence entirely in MBSFN position than bottom, therefore, in order to address this problem, handle after this situation distinguished, specifically when using at least 3 bits to come marker information, can further include:
To use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station to same one deck, as the relay base station.
Also will describe below.
In above-mentioned enforcement, the base station can be a low power base station.Concrete, the base station can be the family base station in the low power base station, or Pico cell formula base station, or femtocell formula base station, or the midsequent base station.
Embodiment for a better understanding of the present invention will add communication network since a low power base station start back below and come the Synchronous Processing implementation process of a base station is described.
Fig. 4 is a low power base station synchronization implementation schematic flow sheet, as shown in the figure, can comprise the steps:
In this step, the base station of newly starting shooting receives network management configuration information, comprises the configuring condition that is used for synchronous MBSFN subframe of each layer in this information.
In this step, new base station judges whether oneself exists high accuracy synchronization mechanisms such as GPS, if having, directly enters step 405, if do not have, then needs by eating dishes without rice or wine, and the interface of support obtains synchronizing information, enters step 404a; Perhaps, carry out entering step 404b synchronously according to the corresponding protocol flow process.
In this step, new base station can supply the synchronisation source of monitoring by the step search of carrying out similar terminal cell initial search, and sets up synchronously with it.New obtain the relevant information of synchronisation source, comprise the layer information of synchronisation source and whether synchronous information by air interface or supported interface (as X2 interface).In this stage, new base station may obtain one group and can supply synchronous synchronisation source, need therefrom select the node of an optimum to carry out synchronously.The criterion of selecting can for: when synchronisation source is in synchronous regime, as synchronous target, and after setting up synchronously, oneself state is designated as synchronously with the strongest one of signal in the synchronous synchronisation source; When not having synchronisation source to be in synchronous regime, from all synchronisation sources, to select a strongest synchronous target of conduct of signal, and after setting up synchronously, oneself state is designated as step-out, the purpose that is designated as step-out is for fear of error propagation.
In step 404a, if this base station is the new network element that R10 or other system introduce, can carry out synchronously according to the corresponding protocol flow process, such as for relay, can be undertaken synchronously by the Backhaul subframe of configuration.
In this step, after finishing initial synchronisation, need to keep synchronously, specifically can be by monitoring CRS or keeping synchronously by the agreement flow process.
Information with oneself after step 406, the operate as normal sends to down one deck by eating dishes without rice or wine.
In this step,, need own layer information and synchronizing information sent in order to allow down the base station of one deck carry out synchronously.This information can be by broadcasting in MIB or SIB, also can send by the subframe position that is used to monitor synchronizing information in one deck base station down.
In this step, whether the MBSFN sub-frame configuration when judging this base station operate as normal changes, if indeclinable words are then got back to step 405 and kept synchronously.If change, then change step 408 over to.
In this step,, then after changing step 408 over to, two kinds of schemes can be arranged if in step 407, change:
A kind of is that direct configuration variation MBSFN in the step 410 is submitted to webmaster, is handled by webmaster,, judges by webmaster whether this variation can influence the subframe at sync bit place that is;
A kind of is that the base station that is changed by MBSFN configuration in the step 409 is at first judged see whether the variation of MBSFN can influence the subframe at sync bit place, if do not influence then directly enter step 413, self adjusts the base station.If influence is then submitted to webmaster and handled, enter step 411.
In addition, step 408 is optional steps in the enforcement, and promptly the base station need also can judge whether webmaster to assist, but directly changes step 410 over to, is implemented by webmaster, perhaps directly changes step 409 over to and is implemented voluntarily by the base station.
In step 409 and 410, when webmaster is submitted in the change of MBSFN sub-frame configuration of self, can handle accordingly by giving webmaster on the network management interface.
In this step, webmaster can reconfigure the sync bit of each layer according to the sub-frame configuration situation of change of the MBSFN that submits, redistributes and can carry out according to certain principle, and the subframe that has been sync bit such as preferential maintenance is new sync bit.
In this step, webmaster is handed down to new synchronous configuration information the base station of each layer.
The corresponding adjustment done in step 413, base station.
In this step, carry out synchronously on the sync bit that upgrades the base station.
In concrete the enforcement, three kinds of execution modes can be arranged at step 402:
1, the agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle, and the information of transmission is the positional information of subframe numbers, each layer;
2, the agreement different layers is all uploaded in same subframe, and layer n disposes MBSFN on the position of SFN mod (M*N)=n, like this, the information that needs to transmit just is reduced to subframe numbers, M, the size of M can be provided with according to the update cycle, and the update cycle is more little, and M is more little;
3, directly indicate the subframe numbers and the positional information of different layers.
In concrete the enforcement, two kinds of execution modes can be arranged at step 406:
That is, after introducing new network element, new net element information can be notified by following method:
1, the layer information of 2 bits is expanded to 3 bits.
In this mode, the layer information of 3 bits can be supported 8 layers base station at most, can support more eurypalynous new network element node; Simultaneously, for the situation of the subframe waste of mourning in silence that may occur, can on fixing layer, solve by fixing some special base station, such as, as shown in the table, fixedly the relay base station is layer 1 (001) expression, and like this, finding to follow the tracks of synchronous base station when the synchronous base station of needs is layer 1, this base station just knows that following the tracks of synchronous base station is the relay base station, mourn in silence with regard to not carrying out synchronous subframe in the lower level base station in this base station so, can send data normally, saved resource.
| Layer information | Base station type |
| 000 | Base station with external synchronization source (as GPS) |
| 001 | ?Relay |
| 010 | ?Reserved |
| 011 | ?Reserved |
| 100 | ?Reserved |
| 101 | The Home base station |
| 110 | The Home base station |
| 111 | The Home base station |
2, increase new mark domain
Increase a new mark domain, be used for indicating the information of new network element node, be used to distinguish different base station types.
In concrete the enforcement, three kinds of execution modes can be arranged at step 405:
1, the CRS of tracking last layer base station keeps synchronously.
For example: the CRS that monitors the last layer base station on the sync bit that the Home base station can dispose again keeps synchronously.What of the sync bit of the configuration of different layers can be different, and are relevant with synchronization accuracy.
2, keep synchronously according to the agreement flow process.
For the network element node of some new introducings, can keep synchronously according to the agreement flow process, such as picture relay node, can keep synchronously in the backhaul subframe of configuration.
Based on same inventive concept, a kind of base station also is provided in the embodiment of the invention, because the principle of dealing with problems in this base station is similar to the inter-sync method in hierarchical system base station, so the enforcement of base station can repeat part and repeat no more referring to the enforcement of method.
Fig. 5 is the architecture of base station schematic diagram, as shown in the figure, can comprise in the base station:
Keep synchronously module 501, be used for carrying out synchronously on the sync bit of the configuration information of the 2nd MBSFN subframe, the configuration information of described the 2nd MBSFN subframe is that current each layer is used for synchronous MBSFN subframe configuration information;
Submit module 503, be used for when a definite MBSFN sub-frame configuration changes, give webmaster in the change with a MBSFN sub-frame configuration, or, when determining that in the base station MBSFN sub-frame configuration change can influence the 2nd MBSFN subframe at sync bit place, give webmaster in the change with a MBSFN sub-frame configuration;
In the enforcement, in the base station, can further include:
Synchronization mechanism is selected module 506, is used to select to carry out synchronous synchronization mechanism.
In the enforcement, when receiver module can be further used for receiving in start back, base station the 2nd MBSFN subframe configuration information that webmaster issues, the form that this configuration information issues comprised:
The agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle, and the information of transmission is the positional information of subframe numbers, each layer;
Or the agreement different layers is all uploaded in same subframe, and layer n disposes MBSFN on the position of SFN mod (M*N)=n, the size of M was provided with according to the update cycle, and wherein, N is total number of plies, in the cycle of M for upgrading, SFN mod x is meant of System Frame Number x to be made and gets surplus operation;
Or, the subframe numbers and the positional information of indication different layers.
In the enforcement, synchronization mechanism selects module can be further used for carrying out synchronously according to the synchronization mechanism that synchronization mechanism selects module to select;
Can further include: initial synchronization module 507, the layer information and the synchronous regime that are used to read the last layer base station are carried out initial synchronisation, or, carry out initial synchronisation according to the agreement flow process;
Described synchronous maintenance module can be further used for after initial synchronisation is finished, and keeps synchronously by the CRS of monitoring monitoring last layer base station on the sync bit of gateway configuration or by the agreement flow process.
In the enforcement, initial synchronization module can also be further used for when the layer information that reads the last layer base station and Synchronization Status Message are selected synchronisation source, when synchronisation source is in synchronous regime,, and after setting up synchronously, oneself state is designated as synchronously as synchronous target with the strongest one of signal in the synchronous synchronisation source; When not having synchronisation source to be in synchronous regime, from all synchronisation sources, select a strongest synchronous target of conduct of signal, and after setting up synchronously, oneself state is designated as step-out.
In the enforcement, in the base station, can further include:
In the enforcement, information sending module can also be further used for when the layer information of transmission base station, the base station of downward one deck and synchronizing information, pbs layer information and synchronizing information in MIB or SIB; Or the subframe position that is used to monitor synchronizing information in following one deck base station sends layer information and synchronizing information.
In the enforcement, information sending module can be further used for using at least 3 bits to come marker information; Or, increasing new mark domain, described mark domain is used to indicate the type of base station.
In the enforcement, information sending module can be further used at least when using 3 bits to come marker information, will use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station at same one deck.
In the enforcement, the base station can be a low power base station.
Concrete, the base station can be the family Home base station in the low power base station, or Pico cell formula Pico base station, or femtocell formula Femto base station, or midsequent Relay base station.
For the convenience of describing, the each several part of the above device is divided into various modules with function or the unit is described respectively.Certainly, when enforcement is of the present invention, can in same or a plurality of softwares or hardware, realize the function of each module or unit.
As seen from the above-described embodiment, considered the problem on the synchronization mechanism that the introducing of new network element brings in the technical scheme that the embodiment of the invention provides, also considered the dynamic change of present synchronization mechanism simultaneously, and proposed the scheme that solves
Concrete, synchronous processing mode is provided in the technical scheme that the embodiment of the invention provides; And providing needs the synchronous base station of acquisition to obtain synchronous configuration information or carry out synchronous processing mode according to the agreement flow process; Provide the base station after the operate as normal to send synchronization node information processing mode; If provide the MBSFN configuration to change, carried out corresponding processing mode.
Further, also provide the base station to obtain the mode of the sync bit information of network management configuration, these modes can comprise:
1, the agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle;
2, the agreement different layers is all uploaded in same subframe, and layer n disposes the synchronous subframe of MBSFN on the position of SFN mod (M*N)=n;
3, directly indicate the subframe numbers and the positional information of different layers;
Further, also provide synchronization node transmission of Information form, can comprise:
1, the layer indication information of 2 bits expanded to 3 bits;
2, increase new information field and indicate new network element.
Further, also provide the processing mode of MBSFN configuration variation, can comprise:
1, the variation that directly will dispose of base station is submitted to webmaster and is handled;
The change of the MBSFN configuration that webmaster is submitted to according to the base station is carried out centralized adjustment and is handed down to relevant base station and adjusts.
2, judgement is at first done in the base station, does corresponding processing again;
Under this scheme,, then directly change accordingly if do not need the webmaster cooperation.
The cooperation of webmaster is if desired then submitted to webmaster to the variation of configuration and is carried out centralized processing.
As seen, the technical scheme of the embodiment of the invention provides a kind of synchronous scheme with backwards compatibility, has designed new flow process to tackle the problem that exists in the present synchronization mechanism.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
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 (22)
1. the inter-sync method in hierarchical system base station is characterized in that, comprises the steps:
Carry out on the sync bit of base station in the configuration information of the second multicast/broadcast Single Frequency Network MBSFN subframe synchronously, the configuration information of described the 2nd MBSFN subframe is that current each layer is used for synchronous MBSFN subframe configuration information;
The base station determines whether a MBSFN sub-frame configuration changes, and the configuration information of a described MBSFN subframe is a base station own service MBSFN sub-frame configuration;
When determining that in the base station MBSFN sub-frame configuration changes, give webmaster in the change with a MBSFN sub-frame configuration, or, when determining that in the base station MBSFN sub-frame configuration change can influence the 2nd MBSFN subframe at sync bit place, give webmaster in the change with a MBSFN sub-frame configuration, or, determine that in the base station MBSFN sub-frame configuration changes in the time of can not influencing the 2nd MBSFN subframe at sync bit place, professional MBSFN configuration is adjusted in base station oneself;
Carry out on the sync bit of base station in the configuration information of the 3rd MBSFN subframe that webmaster returns synchronously, the configuration information of described the 3rd MBSFN subframe is the variation distribution of webmaster according to a MBSFN sub-frame configuration.
2. the method for claim 1 is characterized in that, carry out synchronously on the sync bit of base station in the configuration information of the 2nd MBSFN subframe before, further comprise:
The configuration information of the 2nd MBSFN subframe that base station start back reception webmaster issues;
Base station selectedly carry out synchronous synchronization mechanism.
3. method as claimed in claim 2 is characterized in that, when the 2nd MBSFN subframe configuration information that base station start back reception webmaster issues, the form that this configuration information issues comprises:
The agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle, and the information of transmission is the positional information of subframe numbers, each layer;
Or the agreement different layers is all uploaded in same subframe, and layer n disposes MBSFN on the position of SFN mod (M*N)=n, the size of M was provided with according to the update cycle, and wherein, N is total number of plies, in the cycle of M for upgrading, SFN mod x is meant of System Frame Number x to be made and gets surplus operation;
Or, the subframe numbers and the positional information of indication different layers.
4. method as claimed in claim 2 is characterized in that, the base station carries out comprising when synchronous according to the synchronization mechanism of its selection:
Read the layer information and the synchronous regime of last layer base station and carry out initial synchronisation, or, carry out initial synchronisation according to the agreement flow process;
After initial synchronisation is finished, keep synchronously by the exclusive pilot signal CRS in sub-district of monitoring monitoring last layer base station on the sync bit of gateway configuration or by the agreement flow process.
5. method as claimed in claim 4, it is characterized in that, when the layer information that reads the last layer base station and Synchronization Status Message are selected synchronisation source, when synchronisation source is in synchronous regime,, and after setting up synchronously, oneself state is designated as synchronously as synchronous target with the strongest one of signal in the synchronous synchronisation source; When not having synchronisation source to be in synchronous regime, from all synchronisation sources, select a strongest synchronous target of conduct of signal, and after setting up synchronously, oneself state is designated as step-out.
6. method as claimed in claim 4 is characterized in that, after keeping synchronously, further comprises:
The base station of the downward one deck in base station sends the layer information and the synchronizing information of base station.
7. method as claimed in claim 6 is characterized in that, layer information and synchronizing information that the base station of the downward one deck in base station sends the base station comprise:
The base station is pbs layer information and synchronizing information in master control block of information MIB or system information block SIB;
Or the base station is used to monitor the subframe position transmission layer information and the synchronizing information of synchronizing information in following one deck base station.
8. method as claimed in claim 7 is characterized in that, uses at least 3 bits to come marker information;
Or, increasing new mark domain, described mark domain is used to indicate the type of base station.
9. method as claimed in claim 8 is characterized in that, when using at least 3 bits to come marker information, further comprises:
To use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station to same one deck.
10. as the arbitrary described method of claim 1 to 9, it is characterized in that described base station is a low power base station.
11. method as claimed in claim 10 is characterized in that, described base station is the family Home base station in the low power base station, or Pico cell formula Pico base station, or femtocell formula Femto base station, or midsequent Relay base station.
12. a base station is characterized in that, comprising:
Keep synchronously module, be used for carrying out synchronously on the sync bit of the configuration information of the 2nd MBSFN subframe, the configuration information of described the 2nd MBSFN subframe is that current each layer is used for synchronous MBSFN subframe configuration information;
The configuration determination module is used for determining whether a MBSFN sub-frame configuration changes, and the configuration information of a described MBSFN subframe is a base station own service MBSFN sub-frame configuration;
Submit module, be used for when a definite MBSFN sub-frame configuration changes, give webmaster in the change with a MBSFN sub-frame configuration, or, when determining that in the base station MBSFN sub-frame configuration change can influence the 2nd MBSFN subframe at sync bit place, give webmaster in the change with a MBSFN sub-frame configuration;
Synchronous update module is used for carrying out synchronously on the sync bit of the configuration information of the 3rd MBSFN subframe that webmaster returns, and to be webmaster distribute according to the variation of a MBSFN sub-frame configuration configuration information of described the 3rd MBSFN subframe.
13. base station as claimed in claim 12 is characterized in that, further comprises:
Receiver module, be used on the sync bit of the configuration information of the 2nd MBSFN subframe, carrying out synchronously before, after start, receive the configuration information of the 2nd MBSFN subframe that webmaster issues;
Synchronization mechanism is selected module, is used to select to carry out synchronous synchronization mechanism.
14. base station as claimed in claim 13 is characterized in that, when described receiver module was further used for receiving in start back, base station the 2nd MBSFN subframe configuration information that webmaster issues, the form that this configuration information issues comprised:
The agreement different layers is all uploaded in same subframe, and the synchronous subframe of different layers is distinguished with the diverse location of a MBSFN in the cycle, and the information of transmission is the positional information of subframe numbers, each layer;
Or the agreement different layers is all uploaded in same subframe, and layer n disposes MBSFN on the position of SFN mod (M*N)=n, the size of M was provided with according to the update cycle, and wherein, N is total number of plies, in the cycle of M for upgrading, SFN mod x is meant of System Frame Number x to be made and gets surplus operation;
Or, the subframe numbers and the positional information of indication different layers.
15. base station as claimed in claim 13 is characterized in that, described synchronization mechanism selects module to be further used for carrying out synchronously according to the synchronization mechanism that synchronization mechanism selects module to select;
Further comprise: initial synchronization module, the layer information and the synchronous regime that are used to read the last layer base station are carried out initial synchronisation, or, carry out initial synchronisation according to the agreement flow process;
Described synchronous maintenance module is further used for after initial synchronisation is finished, and keeps synchronously by the CRS of monitoring monitoring last layer base station on the sync bit of gateway configuration or by the agreement flow process.
16. base station as claimed in claim 15, it is characterized in that, described initial synchronization module is further used for when the layer information that reads the last layer base station and Synchronization Status Message are selected synchronisation source, when synchronisation source is in synchronous regime,, and after setting up synchronously, oneself state is designated as synchronously as synchronous target with the strongest one of signal in the synchronous synchronisation source; When not having synchronisation source to be in synchronous regime, from all synchronisation sources, select a strongest synchronous target of conduct of signal, and after setting up synchronously, oneself state is designated as step-out.
17. base station as claimed in claim 15 is characterized in that, further comprises:
Information sending module is used for after keeping synchronously, and the base station of one deck sends the layer information and the synchronizing information of base station downwards.
18. base station as claimed in claim 17 is characterized in that, described information sending module is further used for when the layer information of transmission base station, the base station of downward one deck and synchronizing information, pbs layer information and synchronizing information in MIB or SIB; Or the subframe position that is used to monitor synchronizing information in following one deck base station sends layer information and synchronizing information.
19. base station as claimed in claim 18 is characterized in that, described information sending module is further used for using at least 3 bits to come marker information; Or, increasing new mark domain, described mark domain is used to indicate the type of base station.
20. base station as claimed in claim 19, it is characterized in that, described information sending module is further used at least when using 3 bits to come marker information, will use identical synchronization mechanism and not use the base station configuration of monitoring this synchronization mechanism between the base station at same one deck.
21., it is characterized in that described base station is a low power base station as the arbitrary described base station of claim 12 to 20.
22. base station as claimed in claim 21 is characterized in that, described base station is the family Home base station in the low power base station, or Pico cell formula Pico base station, or femtocell formula Femto base station, or midsequent Relay base station.
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| CN 200910235444 CN102026363B (en) | 2009-10-14 | 2009-10-14 | Base station internal synchronization method of hierarchical system and base station |
| PCT/CN2010/077692 WO2011044836A1 (en) | 2009-10-14 | 2010-10-13 | Method for synchronization intra base station in layered system and base station |
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| CN 200910235444 CN102026363B (en) | 2009-10-14 | 2009-10-14 | Base station internal synchronization method of hierarchical system and base station |
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Also Published As
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| WO2011044836A1 (en) | 2011-04-21 |
| CN102026363B (en) | 2013-07-10 |
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210623 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |