CN104853427B - A kind of Home eNodeB synchronous method and Home eNodeB - Google Patents
A kind of Home eNodeB synchronous method and Home eNodeB Download PDFInfo
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- CN104853427B CN104853427B CN201410053100.0A CN201410053100A CN104853427B CN 104853427 B CN104853427 B CN 104853427B CN 201410053100 A CN201410053100 A CN 201410053100A CN 104853427 B CN104853427 B CN 104853427B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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Abstract
The invention discloses a kind of Home eNodeB synchronous method and Home eNodeB, this method to include：Home eNodeB starts WiFi module and scans after the power-up is located at other each Home eNodeB that the transmission in the same area has WiFi signal with the Home eNodeB；The main Home eNodeB of synchronizing information can be provided for the Home eNodeB from selection in other each Home eNodeB scanned and according to the time deviation measured from the synchronizing information got in the WiFi signal transmitted by the main Home eNodeB between main Home eNodeB；The local clock that Home eNodeB is adjusted according to the time deviation is synchronous to complete the clock between main Home eNodeB.In this programme, realize that the clock between Home eNodeB synchronizes since synchronizing information can be scanned by the WiFi module being arranged in Home eNodeB, it can thus achieve the purpose that more simply and quickly to realize the precise synchronization between Home eNodeB on the basis of without modifying without interface-free resources are occupied to hardware.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a synchronization method of a home base station and the home base station.
Background
The femtocell is a device integrating functions of a Small base station (generally referred to as a Femto or Small cell) and a WLAN (Wireless Local Area network), and can provide a WiFi Access function and a cellular mobile communication Access function including TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) or TD-LTE (Time Division-Long Term Evolution) at the same Time, and is mainly used for providing an integrated communication solution for home users and enterprise users to achieve effective coverage supplement and capacity expansion of a cellular network.
Specifically, the networking architecture of the home base station may be as shown in fig. 1, wherein the home base station may include a cellular network module for providing a cellular mobile communication access function and a WiFi module for providing a WiFi access function. Further, as shown in fig. 1, the femtocell may access the WLAN authentication system and an EPC (packet Core network) Core network through a broadband backhaul network. The architecture of the EPC core Network and the WLAN Authentication system is the same as that of the existing EPC core Network and the existing WLAN Authentication system, for example, the EPC core Network may include devices such as an MME (Mobility Management Entity), an HSS (Home subscriber server), an S-GW (Serving Gateway), a P-GW (Packet Data Gateway), and the WLAN Authentication system may include a Portal (Portal server), an AC (access controller), an AAA (Authentication Authorization Accounting, Authentication, Authorization, and Accounting) server, and the like, which are not described herein again; furthermore, as shown in fig. 1, the networking architecture of the hnb may further include a hnb gateway responsible for managing and transmitting hnb data and newly added devices such as a hnb network manager, which are not described herein again.
Specifically, when a plurality of home base stations are networked in the same set area, similar to a macro base station, for a home base station networking system of a TDD (time division-synchronous code division multiple access) system (such as a TD-SCDMA or TD-LTE system), clock synchronization needs to be maintained among the home base stations in the home base station networking system to avoid signal interference generated among the home base stations. In addition, when the home base station and the macro base station adjacent to the home base station are deployed in the same frequency band, clock synchronization with the macro base station is required.
Specifically, the following methods are commonly used in the industry to achieve clock synchronization between home base stations:
the first method is as follows: a GPS (Global Positioning System) satellite synchronization method is adopted. Specifically, the GPS satellite signals can be received through an external GPS antenna to achieve clock synchronization between the home base stations. However, because the GPS antenna needs to be installed in an outdoor unobstructed area to successfully receive GPS satellite signals when using this method, it is difficult to connect the outdoor GPS antenna to a femtocell networking system that is mainly deployed indoors and coverage of which is often completed by tens of femtocells deployed in one area.
The second method comprises the following steps: the clock synchronization is carried out by adopting an IEEE1588v2 protocol through a transmission network. Specifically, when the method is adopted, a reference clock, which may be an atomic clock or a GPS synchronization signal, is set on a certain centralized device on the core network side by using the characteristic that all base stations are connected to the core network through a transmission network, and then the synchronization information and a normal data service packet are sent to the base station device together by using a standard scheme specified by IEEE1588v2 protocol through a wired transmission network, and the base station device receives the signal and calibrates a local clock by means of delay measurement compensation and the like to keep synchronization with the reference clock. However, when the method is adopted, all transmission devices in the transmission network are required to support the IEEE1588v2 time synchronization protocol, and device hardware modification or replacement is required, so that the proportion of the transmission devices supporting the protocol in the actual network is low at present, and the synchronization requirement when the femtocell is deployed on a large scale is inconvenient.
The third method comprises the following steps: and synchronizing by intercepting air interface signals of the outdoor macro base station or other home base stations. In this way, the femtocell can switch to a network listening mode to autonomously receive the broadcast signals of the neighboring cells during initial power-on or periodic operation, and can analyze the synchronization signals from the network listening mode according to a standard protocol frame structure and synchronize to the neighboring cells based on the synchronization signals. However, when this method is adopted, since the synchronization signal needs to be obtained by monitoring in addition to the normal communication transceiving, part of the time slot generally needs to be occupied to specially receive the signal of the neighboring cell, which reduces the utilization efficiency of the user resource of the cell.
In summary, when the currently common clock synchronization method is adopted to perform clock synchronization between the home base stations, the problems of difficult deployment, need to modify hardware devices of the home base stations, need to occupy air interface resources, and the like often exist, so that the synchronization efficiency and the synchronization effect between the home base stations are low.
Disclosure of Invention
The embodiment of the invention provides a synchronization method and synchronization equipment for home base stations, which are used for solving the problems of poor synchronization efficiency and poor synchronization effect when the existing clock synchronization mode is adopted to carry out clock synchronization between home base stations.
The embodiment of the invention provides a home base station synchronization method, which comprises the following steps:
the method comprises the steps that after the home base station is powered on, a WiFi module arranged in the home base station is started, and other home base stations which are located in the same set area with the home base station and send WiFi signals are scanned through the WiFi module;
according to the WiFi signals sent by the other scanned home base stations, selecting a main home base station which can provide corresponding synchronous information for the home base station from the other scanned home base stations;
and acquiring corresponding synchronization information from a WiFi signal sent by the master home base station, measuring the time deviation between the home base station and the master home base station according to the acquired synchronization information, and adjusting a local clock of the home base station according to the time deviation so as to complete clock synchronization between the home base station and the master home base station.
Further, the method further comprises:
if the WiFi module does not scan WiFi signals or scans other femtocell which is positioned in the same set area with the femtocell and sends WiFi signals and determines that no main femtocell capable of providing corresponding synchronization information for the femtocell exists in the scanned other femtocells, the WiFi module does not scan WiFi signals or scans other femtocells which are positioned in the same set area with the femtocells and send WiFi signals, and then the main femtocell is used for providing corresponding synchronization information for the femtocells
And broadcasting corresponding synchronization information through the WiFi module so that other femtocell in the same set area with the femtocell realizes clock synchronization with the femtocell according to the synchronization information broadcast by the WiFi module.
Further, according to the WiFi signals sent by the scanned other femtocells, selecting a master femtocell capable of providing corresponding synchronization information for the femtocells from the scanned other femtocells, including:
according to the WiFi signals sent by the other scanned home base stations, selecting the home base station carrying a specific synchronous information identifier in the sent WiFi signals from the other scanned home base stations as a main home base station capable of providing corresponding synchronous information for the home base station; or,
according to the WiFi signals sent by the other scanned home base stations, any home base station with equipment priority higher than that of the home base station is selected from the other scanned home base stations as a main home base station capable of providing corresponding synchronous information for the home base station.
Further, selecting any one of the scanned other femtocells with a higher device priority level than the femtocell as a master femtocell capable of providing corresponding synchronization information for the femtocells, including:
and selecting other home base stations with equipment priority higher than that of the home base station from the scanned other home base stations, and selecting the home base station with the priority closest to the home base station from the other home base stations with equipment priority higher than that of the home base station as a master home base station capable of providing corresponding synchronization information for the home base station, or selecting the home base station with the highest priority from the other home base stations with equipment priority higher than that of the home base station as the master home base station capable of providing corresponding synchronization information for the home base station.
Further, measuring a time offset between the home base station and the master home base station according to the acquired synchronization information includes:
according to the acquired synchronization information, acquiring first time information T1 carried in the synchronization information and used for indicating corresponding sending time when the master home base station sends the synchronization information, and acquiring second time information T2 used for indicating corresponding acquiring time when the home base station acquires the synchronization information from the master home base station;
feeding back a first data packet to the master home base station, where the first data packet carries third time information T3 used for indicating a corresponding feedback time when the first data packet is fed back to the master home base station;
receiving a second data packet fed back by the master femtocell, where the second data packet carries fourth time information T4 used for indicating a corresponding feedback time when the master femtocell feeds back the second data packet to the femtocell;
according to the above T1, T2, T3 and T4, the time offset D between the home base station and the master home base station is calculated by the following formula: d =1/2[ (T2-T1) + (T4-T3) ].
Correspondingly, an embodiment of the present invention further provides a home base station, including:
the starting module is used for starting a WiFi module arranged in the family base station after being electrified;
the WiFi module is used for scanning other femtocell which are located in the same set area with the femtocell and send WiFi signals, selecting a main femtocell which can provide corresponding synchronization information for the femtocell from the scanned other femtocells according to the WiFi signals sent by the scanned other femtocells, acquiring the corresponding synchronization information from the WiFi signals sent by the main femtocell, measuring time deviation between the femtocell and the main femtocell according to the acquired synchronization information, and adjusting a local clock of the femtocell according to the time deviation to complete clock synchronization between the femtocell and the main femtocell.
Further, the WiFi module is further configured to broadcast corresponding synchronization information if a WiFi signal is not scanned, or if a WiFi signal is scanned, or a master home base station that is located in the same setting area as the home base station and sends the WiFi signal is scanned, and it is determined that no master home base station that can provide corresponding synchronization information for the home base station exists in the scanned other home base stations, so that the other home base stations located in the same setting area as the home base station implement clock synchronization with the home base station according to the synchronization information broadcast by the WiFi module.
Further, the WiFi module is specifically configured to select, from among the scanned other femtocell base stations, a femtocell base station that carries a specific synchronization information identifier in the transmitted WiFi signal as a master femtocell base station that can provide corresponding synchronization information for the femtocell base station according to the scanned WiFi signal transmitted by each other femtocell base station; or,
according to the WiFi signals sent by the other scanned home base stations, any home base station with equipment priority higher than that of the home base station is selected from the other scanned home base stations as a main home base station capable of providing corresponding synchronous information for the home base station.
Further, the WiFi module is specifically configured to select, from among the scanned other femtocell base stations, any femtocell base station with a device priority level higher than that of the femtocell base station as a master femtocell base station capable of providing corresponding synchronization information for the femtocell base station, by the following means:
and selecting other home base stations with equipment priority higher than that of the home base station from the scanned other home base stations, and selecting the home base station with the priority closest to the home base station from the other home base stations with equipment priority higher than that of the home base station as a master home base station capable of providing corresponding synchronization information for the home base station, or selecting the home base station with the highest priority from the other home base stations with equipment priority higher than that of the home base station as the master home base station capable of providing corresponding synchronization information for the home base station.
Further, the WiFi module is specifically configured to measure a time offset between the home base station and the master home base station according to the acquired synchronization information in the following manner:
according to the acquired synchronization information, acquiring first time information T1 carried in the synchronization information and used for indicating corresponding sending time when the master home base station sends the synchronization information, and acquiring second time information T2 used for indicating corresponding acquiring time when the home base station acquires the synchronization information from the master home base station;
feeding back a first data packet to the master home base station, where the first data packet carries third time information T3 used for indicating a corresponding feedback time when the first data packet is fed back to the master home base station;
receiving a second data packet fed back by the master femtocell, where the second data packet carries fourth time information T4 used for indicating a corresponding feedback time when the master femtocell feeds back the second data packet to the femtocell;
according to the above T1, T2, T3 and T4, the time offset D between the home base station and the master home base station is calculated by the following formula: d =1/2[ (T2-T1) + (T4-T3) ].
The invention has the following beneficial effects:
the embodiment of the invention provides a home base station synchronization method and a home base station, wherein the method comprises the following steps: after the home base station is powered on, the WiFi module is started, and other home base stations which are located in the same area as the home base station and send WiFi signals are scanned through the WiFi module; selecting a main home base station which can provide synchronous information for the home base station from the scanned other home base stations, and measuring time deviation between the main home base station and the main home base station according to the synchronous information acquired from the WiFi signal sent by the main home base station; and adjusting the local clock of the home base station according to the time deviation to complete clock synchronization with the master home base station. In the scheme, the clock synchronization between the home base stations can be realized by scanning the synchronization information through the WiFi module arranged in the home base stations, so that the aim of more simply, conveniently and quickly realizing the accurate synchronization between the home base stations can be fulfilled on the basis of not modifying hardware and occupying air interface resources, and the clock synchronization efficiency and the synchronization effect between the home base stations are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a networking architecture of a conventional home base station;
fig. 2 is a schematic flowchart of a synchronization method for a home base station according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of the home base station according to the second embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a home base station synchronization method and a home base station, wherein the method comprises the following steps: the method comprises the steps that after the home base station is powered on, a WiFi module arranged in the home base station is started, and other home base stations which are located in the same set area with the home base station and send WiFi signals are scanned through the WiFi module; according to the WiFi signals sent by the other scanned home base stations, selecting a main home base station which can provide corresponding synchronous information for the home base station from the other scanned home base stations; and acquiring corresponding synchronization information from a WiFi signal sent by the master home base station, measuring the time deviation between the home base station and the master home base station according to the acquired synchronization information, and adjusting a local clock of the home base station according to the time deviation so as to complete clock synchronization between the home base station and the master home base station.
In the technical scheme of the embodiment of the invention, as the clock synchronization between the home base stations can be realized by scanning the synchronization information through the WiFi module arranged in the home base stations, the aim of realizing the accurate synchronization between the home base stations more simply, conveniently and quickly can be achieved on the basis of not modifying hardware and occupying air interface resources, and the clock synchronization efficiency and the synchronization effect between the home base stations are improved.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
an embodiment of the present invention provides a femtocell synchronization method, as shown in fig. 2, which is a schematic flow chart of the femtocell synchronization method in the first embodiment of the present invention, where the femtocell synchronization method may include the following steps:
step 101: the method comprises the steps that after the home base station is powered on, a WiFi module arranged in the home base station is started, and other home base stations which are located in the same set area with the home base station and send WiFi signals are scanned through the WiFi module.
Specifically, after the femtocell is powered on and started up, a WiFi (wireless fidelity) module arranged in the femtocell may be automatically or according to a trigger to scan WiFi signals sent by other femtocells existing nearby through the WiFi module, that is, each other femtocell which is located in the same setting area (the setting area may be adjusted according to an actual situation, which is not limited in this embodiment of the present invention) as the femtocell and sends WiFi signals is scanned through the WiFi module. The scanned other hnbs are generally hnbs whose transmitted WiFi signals and WiFi signals transmitted by the hnbs have a uniform SSID (Service Set Identifier), which is not described in detail in this embodiment of the present invention.
Step 102: and selecting a main home base station capable of providing corresponding synchronization information for the home base station from the scanned other home base stations according to the WiFi signals sent by the scanned other home base stations.
Specifically, in the embodiment of the present invention, a master hnb capable of providing corresponding synchronization information for the hnb may be selected from the scanned other hnbs in the following manner:
the first method is as follows: and selecting the femtocell carrying the specific synchronization information identifier in the transmitted WiFi signals from the scanned other femtocells as a main femtocell capable of providing corresponding synchronization information for the femtocells according to the scanned WiFi signals transmitted by the other femtocells.
The specific synchronization information identifier may be an identifier for indicating that an identity corresponding to the corresponding home base station is a master home base station, so that other home base stations without the specific synchronization information identifier use the home base station with the specific synchronization information identifier as the corresponding master home base station, and initiate a clock synchronization process to the home base station with the specific synchronization information identifier.
It should be noted that the first method is particularly applicable to a scenario where only two neighboring hnbs or a plurality of hnbs can monitor a certain central hnb, which is not described in this embodiment of the present invention.
The second method comprises the following steps: according to the WiFi signals sent by the other scanned home base stations, any home base station with equipment priority higher than that of the home base station is selected from the other scanned home base stations as a main home base station capable of providing corresponding synchronous information for the home base station.
Specifically, under the scenario of the second mode, when each femtocell transmits a corresponding WiFi signal, the corresponding device priority information may be broadcast in the WiFi signal transmitted by each femtocell, so that after any femtocell is powered on, according to the scanned WiFi signals of all nearby femtocells, any femtocell with a device priority higher than that of the femtocell may be selected as the master femtocell capable of providing corresponding synchronization information for the femtocells.
Further, selecting any one of the scanned other hnbs having a higher device priority level than the hnb as the master hnb capable of providing the corresponding synchronization information for the hnb may include:
selecting, from the scanned other femtocells, other femtocells whose device priority level is higher than that of the femtocell, and selecting, from the other femtocells whose device priority level is higher than that of the femtocells, a femtocell whose priority level is closest to the femtocell as a master femtocell capable of providing corresponding synchronization information for the femtocells, or selecting, from the other femtocells whose device priority level is higher than that of the femtocells, a femtocell whose priority level is highest as a master femtocell capable of providing corresponding synchronization information for the femtocells.
It should be noted that the second method is particularly applicable to a scenario where multiple hnbs need to perform synchronization serially, which is not described in this embodiment of the present invention.
It should be noted that, an execution main body of step 102 is also generally a WiFi module disposed in the femtocell, and this is not described in detail in this embodiment of the present invention.
Step 103: and acquiring corresponding synchronization information from a WiFi signal sent by the master home base station, measuring the time deviation between the home base station and the master home base station according to the acquired synchronization information, and adjusting a local clock of the home base station according to the time deviation so as to complete clock synchronization between the home base station and the master home base station.
Specifically, in the embodiment of the present invention, a method similar to ntp (network Time protocol) network synchronization or IEEE1588v2 ethernet synchronization or the like may be adopted, a timestamp of the synchronization information is obtained according to the obtained synchronization information, a Time offset between the femtocell and the master femtocell is measured according to the timestamp, and a local clock of the femtocell is adjusted according to the Time offset (for example, the Time offset is compensated for the local clock of the femtocell), so that clock synchronization between the femtocell and the master femtocell is achieved.
Further, in the embodiment of the present invention, measuring a time offset between the home base station and the master home base station according to the acquired synchronization information may include:
according to the acquired synchronization information, acquiring first time information T1 (i.e. a timestamp in the synchronization information) carried in the synchronization information and used for indicating a corresponding transmission time when the master home base station transmits the synchronization information, and acquiring second time information T2 (or may also be considered as a corresponding reception time when the home base station receives a WiFi signal transmitted by the master home base station) used for indicating a corresponding acquisition time when the home base station acquires the synchronization information from the master home base station;
feeding back a first data packet to the master home base station, where the first data packet carries third time information T3 used for indicating a corresponding feedback time when the first data packet is fed back to the master home base station; further, the first data packet may also carry second time information T2, which is not limited in this embodiment of the present invention;
receiving a second data packet fed back by the master femtocell, where the second data packet carries fourth time information T4 used for indicating a corresponding feedback time when the master femtocell feeds back the second data packet to the femtocell; further, the second data packet may also carry second time information T2 and third time information T3, which is not limited in this embodiment of the present invention;
according to the above T1, T2, T3 and T4, the time offset D between the home base station and the master home base station is calculated by the following formula:
D=1/2[(T2-T1)+(T4-T3)]。
further, after obtaining the time offset D between the home base station and the master home base station, the local clock of the home base station may be compensated by using the time offset D, so as to achieve clock synchronization between the home base station and the master home base station.
It should be noted that, since the position or the propagation environment between the hnbs may change at any time, and further the delay skew changes accordingly, in the embodiment of the present invention, in order to keep synchronization between the hnbs all the time, the synchronization process needs to be performed in real time or periodically according to an actual situation, which is not described in detail in this embodiment of the present invention.
Further, in the embodiment of the present invention, the method may further include:
if no WiFi signal is scanned through the WiFi module, or other femtocells which are located in the same set area with the femtocells and send WiFi signals are scanned through the WiFi module, and it is determined that no main femtocell which can provide corresponding synchronization information for the femtocells exists in the other scanned femtocells, the corresponding synchronization information is broadcasted through the WiFi module, so that other femtocells which are located in the same set area with the femtocells can achieve clock synchronization with the femtocells according to the synchronization information broadcasted through the WiFi module, namely, at the moment, the femtocells can serve as main femtocells, and therefore subsequent other femtocells can achieve clock synchronization with each other according to the femtocells.
It should be noted that, an execution main body of step 103 is also generally a WiFi module disposed in the femtocell, and this is not described in detail in this embodiment of the present invention.
The embodiment of the invention provides a home base station synchronization method, wherein after being powered on, a home base station can start a WiFi module and scan other home base stations which are positioned in the same area with the home base station and send WiFi signals through the WiFi module, a main home base station which can provide synchronization information for the home base station is selected from the scanned other home base stations, time deviation between the main home base station and the home base station is measured according to the synchronization information acquired from the WiFi signals sent by the main home base station, and a local clock of the home base station is adjusted according to the time deviation so as to complete clock synchronization between the home base station and the main home base station. In the technical scheme of the embodiment of the invention, as the clock synchronization between the home base stations can be realized by scanning the synchronization information through the WiFi module arranged in the home base stations, the aim of realizing the accurate synchronization between the home base stations more simply, conveniently and quickly can be achieved on the basis of not modifying hardware and occupying air interface resources, and the clock synchronization efficiency and the synchronization effect between the home base stations are improved.
Example two:
a second embodiment of the present invention provides a femtocell that can be used to implement the method shown in the first embodiment of the present invention, as shown in fig. 3, which is a schematic structural diagram of the femtocell described in the second embodiment of the present invention, where the femtocell may include a start module 11 and a WiFi module 12, where:
the starting module 11 may be configured to start a WiFi module disposed in the femtocell after the femtocell is powered on; the WiFi module 12 may be configured to scan other femtocell base stations located in the same setting area as the femtocell base station and sending WiFi signals, select a master femtocell base station capable of providing corresponding synchronization information for the femtocell base station from the scanned other femtocell base stations according to the WiFi signals sent by the scanned other femtocell base stations, obtain corresponding synchronization information from the WiFi signals sent by the master femtocell base station, measure a time deviation between the femtocell base station and the master femtocell base station according to the obtained synchronization information, and adjust a local clock of the femtocell base station according to the time deviation, so as to complete clock synchronization between the femtocell base station and the master femtocell base station.
Specifically, the WiFi module 12 may be specifically configured to select, according to WiFi signals sent by scanned other femtocell stations, a femtocell station that carries a specific synchronization information identifier in the sent WiFi signals from the scanned other femtocell stations as a master femtocell station that can provide corresponding synchronization information for the femtocell station; or according to the WiFi signals sent by the scanned other femtocell, any femtocell with equipment priority higher than that of the femtocell is selected from the scanned other femtocells as a master femtocell capable of providing corresponding synchronization information for the femtocell.
Wherein, selecting any femtocell with a device priority level higher than that of the femtocell as a master femtocell capable of providing corresponding synchronization information for the femtocells from the scanned other femtocells may include:
and selecting other home base stations with equipment priority higher than that of the home base station from the scanned other home base stations, and selecting the home base station with the priority closest to the home base station from the other home base stations with equipment priority higher than that of the home base station as a master home base station capable of providing corresponding synchronization information for the home base station, or selecting the home base station with the highest priority from the other home base stations with equipment priority higher than that of the home base station as the master home base station capable of providing corresponding synchronization information for the home base station.
Further, the WiFi module 12 may be specifically configured to measure a time offset between the home base station and the master home base station according to the acquired synchronization information by:
according to the acquired synchronization information, acquiring first time information T1 carried in the synchronization information and used for indicating corresponding sending time when the master home base station sends the synchronization information, and acquiring second time information T2 used for indicating corresponding acquiring time when the home base station acquires the synchronization information from the master home base station;
feeding back a first data packet to the master home base station, where the first data packet carries third time information T3 used for indicating a corresponding feedback time when the first data packet is fed back to the master home base station;
receiving a second data packet fed back by the master femtocell, where the second data packet carries fourth time information T4 used for indicating a corresponding feedback time when the master femtocell feeds back the second data packet to the femtocell;
according to the above T1, T2, T3 and T4, the time offset D between the home base station and the master home base station is calculated by the following formula:
D=1/2[(T2-T1)+(T4-T3)]。
accordingly, after obtaining the time offset D between the home base station and the master home base station, the WiFi module 12 may compensate the local clock of the home base station by using the time offset D, so as to achieve clock synchronization between the home base station and the master home base station.
It should be noted that, since the position or the propagation environment between the hnbs may change at any time, and further the delay skew changes accordingly, in the embodiment of the present invention, in order to keep synchronization between the hnbs all the time, the synchronization process needs to be performed in real time or periodically according to an actual situation, which is not described in detail in this embodiment of the present invention.
Further, in the embodiment of the present invention, the WiFi module 12 may be further configured to, if a WiFi signal is not scanned, or other femtocell located in the same setting area as the femtocell and sending the WiFi signal is scanned, and it is determined that there is no master femtocell capable of providing corresponding synchronization information for the femtocell in the scanned other femtocells, broadcast corresponding synchronization information, so that other femtocells located in the same setting area as the femtocell implement clock synchronization with the femtocell according to the synchronization information broadcast by the WiFi module; that is, at this time, the home base station itself may serve as a master home base station, so that the subsequent home base stations implement clock synchronization with each other according to the home base station.
The embodiment of the invention provides a home base station, which can start a WiFi module after being powered on, scan other home base stations which are positioned in the same area with the home base station and send WiFi signals through the WiFi module, select a main home base station which can provide synchronous information for the home base station from the scanned other home base stations, measure time deviation between the main home base station and the main home base station according to the synchronous information acquired from the WiFi signals sent by the main home base station, and adjust a local clock of the home base station according to the time deviation to complete clock synchronization between the home base station and the main home base station. In the technical scheme of the embodiment of the invention, as the clock synchronization between the home base stations can be realized by scanning the synchronization information through the WiFi module arranged in the home base stations, the aim of realizing the accurate synchronization between the home base stations more simply, conveniently and quickly can be achieved on the basis of not modifying hardware and occupying air interface resources, and the clock synchronization efficiency and the synchronization effect between the home base stations are improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A home base station synchronization method is characterized by comprising the following steps:
the method comprises the steps that after the home base station is powered on, a WiFi module arranged in the home base station is started, and other home base stations which are located in the same set area with the home base station and send WiFi signals are scanned through the WiFi module;
according to the WiFi signals sent by the other scanned home base stations, selecting a main home base station which can provide corresponding synchronous information for the home base station from the other scanned home base stations;
and acquiring corresponding synchronization information from a WiFi signal sent by the master home base station, measuring the time deviation between the home base station and the master home base station according to the acquired synchronization information, and adjusting a local clock of the home base station according to the time deviation so as to complete clock synchronization between the home base station and the master home base station.
2. The home base station synchronization method of claim 1, wherein the method further comprises:
if the WiFi module does not scan WiFi signals or scans other femtocell which is positioned in the same set area with the femtocell and sends WiFi signals and determines that no main femtocell capable of providing corresponding synchronization information for the femtocell exists in the scanned other femtocells, the WiFi module does not scan WiFi signals or scans other femtocells which are positioned in the same set area with the femtocells and send WiFi signals, and then the main femtocell is used for providing corresponding synchronization information for the femtocells
And broadcasting corresponding synchronization information through the WiFi module so that other femtocell in the same set area with the femtocell realizes clock synchronization with the femtocell according to the synchronization information broadcast by the WiFi module.
3. The home base station synchronization method according to claim 1 or 2, wherein selecting a master home base station capable of providing corresponding synchronization information for the home base station from the scanned other home base stations according to the WiFi signals transmitted by the scanned other home base stations comprises:
according to the WiFi signals sent by the other scanned home base stations, selecting the home base station carrying a specific synchronous information identifier in the sent WiFi signals from the other scanned home base stations as a main home base station capable of providing corresponding synchronous information for the home base station; or,
according to the WiFi signals sent by the other scanned home base stations, any home base station with equipment priority higher than that of the home base station is selected from the other scanned home base stations as a main home base station capable of providing corresponding synchronous information for the home base station.
4. The femtocell synchronization method according to claim 3, wherein selecting any femtocell with a higher device priority level than the femtocell as a master femtocell capable of providing corresponding synchronization information for the femtocells, from the scanned other femtocells, comprises:
and selecting other home base stations with equipment priority higher than that of the home base station from the scanned other home base stations, and selecting the home base station with the priority closest to the home base station from the other home base stations with equipment priority higher than that of the home base station as a master home base station capable of providing corresponding synchronization information for the home base station, or selecting the home base station with the highest priority from the other home base stations with equipment priority higher than that of the home base station as the master home base station capable of providing corresponding synchronization information for the home base station.
5. The femtocell synchronization method according to claim 1 or 2, wherein measuring the time offset between the femtocell and the master femtocell according to the obtained synchronization information comprises:
according to the acquired synchronization information, acquiring first time information T1 carried in the synchronization information and used for indicating corresponding sending time when the master home base station sends the synchronization information, and acquiring second time information T2 used for indicating corresponding acquiring time when the home base station acquires the synchronization information from the master home base station;
feeding back a first data packet to the master home base station, where the first data packet carries third time information T3 used for indicating a corresponding feedback time when the first data packet is fed back to the master home base station;
receiving a second data packet fed back by the master femtocell, where the second data packet carries fourth time information T4 used for indicating a corresponding feedback time when the master femtocell feeds back the second data packet to the femtocell;
according to the above T1, T2, T3 and T4, the time offset D between the home base station and the master home base station is calculated by the following formula: and D is 1/2[ (T2-T1) - (T4-T3) ].
6. A home base station, comprising:
the starting module is used for starting a WiFi module arranged in the family base station after being electrified;
the WiFi module is used for scanning other femtocell which are located in the same set area with the femtocell and send WiFi signals, selecting a main femtocell which can provide corresponding synchronization information for the femtocell from the scanned other femtocells according to the WiFi signals sent by the scanned other femtocells, acquiring the corresponding synchronization information from the WiFi signals sent by the main femtocell, measuring time deviation between the femtocell and the main femtocell according to the acquired synchronization information, and adjusting a local clock of the femtocell according to the time deviation to complete clock synchronization between the femtocell and the main femtocell.
7. The home base station of claim 6,
the WiFi module is further used for broadcasting corresponding synchronization information if a WiFi signal is not scanned or other femtocell which is located in the same set area with the femtocell and sends the WiFi signal is scanned and it is determined that no main femtocell which can provide the corresponding synchronization information for the femtocell exists in the other scanned femtocells, so that other femtocells located in the same set area with the femtocell can realize clock synchronization with the femtocells according to the synchronization information broadcasted by the WiFi module.
8. The home base station according to claim 6 or 7,
the WiFi module is specifically configured to select, from among the scanned other femtocell base stations, a femtocell base station that carries a specific synchronization information identifier in the WiFi signal sent according to the WiFi signal sent by each scanned other femtocell base station, as a master femtocell base station that can provide corresponding synchronization information for the femtocell base station; or,
according to the WiFi signals sent by the other scanned home base stations, any home base station with equipment priority higher than that of the home base station is selected from the other scanned home base stations as a main home base station capable of providing corresponding synchronous information for the home base station.
9. The hnb of claim 8, wherein the WiFi module is specifically configured to select, from among the scanned other hnbs, any hnb with a higher device priority level than the hnb as a master hnb that can provide the hnb with corresponding synchronization information, by:
and selecting other home base stations with equipment priority higher than that of the home base station from the scanned other home base stations, and selecting the home base station with the priority closest to the home base station from the other home base stations with equipment priority higher than that of the home base station as a master home base station capable of providing corresponding synchronization information for the home base station, or selecting the home base station with the highest priority from the other home base stations with equipment priority higher than that of the home base station as the master home base station capable of providing corresponding synchronization information for the home base station.
10. The femtocell according to claim 6 or 7, wherein the WiFi module is specifically configured to measure a time offset between the femtocell and the master femtocell according to the acquired synchronization information by:
according to the acquired synchronization information, acquiring first time information T1 carried in the synchronization information and used for indicating corresponding sending time when the master home base station sends the synchronization information, and acquiring second time information T2 used for indicating corresponding acquiring time when the home base station acquires the synchronization information from the master home base station;
feeding back a first data packet to the master home base station, where the first data packet carries third time information T3 used for indicating a corresponding feedback time when the first data packet is fed back to the master home base station;
receiving a second data packet fed back by the master femtocell, where the second data packet carries fourth time information T4 used for indicating a corresponding feedback time when the master femtocell feeds back the second data packet to the femtocell;
according to the above T1, T2, T3 and T4, the time offset D between the home base station and the master home base station is calculated by the following formula: and D is 1/2[ (T2-T1) - (T4-T3) ].
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| US11057937B2 (en) * | 2017-10-19 | 2021-07-06 | Qualcomm Incorporated | Relay node connection techniques in wireless backhaul systems |
| CN109905298B (en) * | 2017-12-11 | 2020-10-30 | 大唐移动通信设备有限公司 | Home base station, system and method for accessing home base station to network |
| CN110557823A (en) * | 2018-05-31 | 2019-12-10 | 华为技术有限公司 | clock synchronization method and device, terminal equipment, chip and readable storage medium |
| CN109150359B (en) * | 2018-09-30 | 2020-03-27 | 珠海格力电器股份有限公司 | Time synchronization method and device of air conditioning unit |
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