CN108271169A - A kind of emergent talk-around communication system and method based on LTE Femtocell technologies - Google Patents
A kind of emergent talk-around communication system and method based on LTE Femtocell technologies Download PDFInfo
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- CN108271169A CN108271169A CN201611254997.9A CN201611254997A CN108271169A CN 108271169 A CN108271169 A CN 108271169A CN 201611254997 A CN201611254997 A CN 201611254997A CN 108271169 A CN108271169 A CN 108271169A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
- H04W16/20—Network planning tools for indoor coverage or short range network deployment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/246—Connectivity information discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
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Abstract
The present invention provides a kind of emergent talk-around communication system based on LTE Femtocell technologies, and including off-grid component, the off-grid component includes：Spare LTE core network unit, for the log-on message of the user terminal in emergency communication region and location information to be synchronized to local from LTE core network；Off-grid judging unit, for judge local LTE Femtocell base stations whether off-grid, and start local discovering network topology unit in off-grid；Discovering network topology unit obtains the topological relation of the LTE Femtocell base stations of each off-grid in emergent region；And the base station selected units of LMSP Femto, for judging whether local LTE Femtocell base stations being selected as LMSP Femto base stations according to local load of base station and load threshold.The present invention also provides corresponding emergent talk-around communication methods.The present invention can ensure that the integrality of user information in emergency communication, and can carry out Emergency seismograph network establishment communication automatically without human intervention.
Description
Technical field
The present invention relates to field of communication technology, specifically, the present invention relates to emergent talk-around communication technical fields.
Background technology
In the natural or artificial higher private communication field of communication accident, it is often necessary to have emergency communication mechanism, with
Meets the needs of production and living.Emergent talk-around communication refers to when communication failure occurs in normal LTE communication system, realizes emergent area
The communication access in domain so as to provide continuous communication service for emergent zone user, facilitates the exhibition of emergency management and rescue or other activities
It opens.
In the prior art, emergency communication, which usually relies on, increases spare communication network to realize.Such as in LTE network failure
When, it is urgent to access the communication system based on marine satellite.However in this kind of emergency communication scheme, emergency network and normal communication
Network is two completely isolated networks, and the user information of the two is entirely different, and user can not be naturally from normal communication transition
To emergency communication state, this causes inconvenience to user.Also, since this scheme needs to dispose additional a set of communication network
Network, thus it is with high costs.
On the other hand, Femtocell technologies are a kind of household base station technologies.Femtocell also known as flies honeycomb.Fly honeycomb
It using IP agreement, can be connected by wideband circuits such as user existing ADSL, LAN, distally be realized by dedicated gateway from IP network
To the unicom of mobile network.Its size is similar to ADSL Modem, have it is easy for installation, automatically configure, automatic network planning, i.e.
The characteristics of plug-and-play.Femtocell base station operations are in authorizing frequency range, and transmission power is relatively small, generally milliwatt, therefore
Extremely save the energy.The access device of one Femtocell can generally support multiple mobile subscribers, and its air interface meets
LTE standard, therefore suitable for any existing mobile terminal.Femtocell can be accessed by means of fixed broadband as its backhaul
Network is converged by the Femtocell gateways of network side and is provided the interface towards mobile core network of standard, so as to which user be allowed to connect
Enter mobile network.
In conclusion the These characteristics based on Femtocell technologies, it may be considered that using based on LTE Femtocell skills
Art provides a kind of emergent talk-around communication solution seamlessly transitted that can realize normal communication and emergency communication.
Invention content
Therefore, the task of the present invention is provide a kind of to realize that seamlessly transitting for normal communication and emergency communication is emergent
Talk-around communication solution.
According to an aspect of the invention, there is provided a kind of emergent talk-around communication system based on LTE Femtocell technologies
System, including multiple LTE Femtocell base stations for being integrated with off-grid component, the off-grid component includes：
Spare LTE core network unit, under normal communication state, by the registration of the user terminal in emergency communication region
Information and location information are synchronized to local from LTE core network；LTE core network is served as under off-grid state；
Off-grid judging unit, for judge local LTE Femtocell base stations whether off-grid, and in off-grid start this
The discovering network topology unit on ground；
Discovering network topology unit for carrying out discovering network topology in emergent region, obtains each de- in emergent region
The topological relation of the LTE Femtocell base stations of net；And
The base station selected units of LMSP Femto, for being judged whether according to local load of base station and load threshold by local
LTE Femtocell base stations be selected as to provide the LMSP of spare LTE core network service for other LTE Femtocell base stations
Femto base stations.
Wherein, the spare LTE core network unit includes network element mobility management entity, service gateway nodes, public number
According to network gateway node and spare LTE core network database.
According to another aspect of the present invention, it additionally provides a kind of based on aforementioned answering based on LTE Femtocell technologies
The emergent talk-around communication method of anxious talk-around communication system, includes the following steps：
1) under normal communication state, each LTE Femtocell base stations are by the note of the user terminal in emergency communication region
Volume information and location information are synchronized to from LTE core network in local spare LTE core network database；
2) each LTE Femtocell base stations judge itself whether off-grid, and in off-grid perform step 3)；
3) the LTE Femtocell base stations of each off-grid carry out discovering network topology in emergent region, obtain emergent region
In each off-grid LTE Femtocell base stations topological relation；
4) the LTE Femtocell base stations of each off-grid judge whether to incite somebody to action oneself according to local load of base station and load threshold
Oneself is selected as to provide the LMSP Femto base stations of spare LTE core network service for other LTE Femtocell base stations.
Wherein, in the step 1), LTE core network is only by changed synchronizing information to each LTE
In the spare LTE core network database of Femtocell base stations.
Wherein, the step 1) further includes：When user terminal leaves communication range, carry out solution registration and pass through LTE cores
Heart net will solve log-on message update in the spare LTE core network database of each LTE Femtocell base stations, with
When the state of family terminal does not change, synchronizing information is not carried out to the spare LTE core network database.
Wherein, the LTE Femtocell base stations are based on SCTP mechanism and connect LTE core network；
The step 2) further includes：After LTE Femtocell base stations capture SCTP HeartBeat request bags, one
It fixes time when not hearing SCTP HeartBeat confirmation data packets still in interval, then automatic decision LTE Femtocell base stations
In off-grid state.
Wherein, the step 3) further includes：During discovering network topology, each off-grid LTE Femtocell are obtained
The IP of base station and load and the quantity information of off-grid LTE Femtocell base stations.
Wherein, in the step 4), if LMSP Femto base stations oneself will be selected as, start spare LTE core network list
The service function of member, spare LTE core network service is provided for other LTE Femtocell base stations.
Wherein, in the step 4), the load threshold according to current off-grid LTE Femtocell load of base station situations with
And off-grid LTE Femtocell base stations determine as LMSP Femto base stations number.
Wherein, in the step 4), each current not elected off-grid LTE Femtocell base stations perform：To local negative
Information carrying breath is normalized；Calculate current load threshold T (G)；By the local load information after normalized with working as
Preceding load threshold T (G) compares, if less than T (G), using off-grid LTE Femtocell base stations as LMSP Femto bases
It stands；
The computational methods of current load threshold T (G) are as follows：
Wherein N represents the set of the emergent available off-grid LTE Femtocell base stations in region, and p can connect for single off-grid EPC
Enter the inverse of the quantity of LTE Femtocell base stations, r is the wheel number residing for current LMSP Femto base station selections, and mod functions are
Logarithm remainder, G represent not elected off-grid LTE Femtocell base stations；
When r is the integral multiple of 1/p, represent that a wheel was all elected in all available off-grid LTE Femtocell base stations
All available off-grid LTE Femtocell base stations are set to were not elected to LMSP Femto bases at this time by LMSP Femto base stations
It stands, so as to restart LMSP Femto base station selections.
Compared with prior art, the present invention has following technique effect：
1st, talk-around communication of meeting an urgent need in the present invention is same in real time with the user terminal information (i.e. UE information) under normal communication state
Step, ensure that the integrality of user information in emergency communication.
2nd, LTE Femtocell base stations without human intervention, realize whether automatic decision itself is in off-grid in the present invention
State.
3rd, the present invention is based on OSPF (Open Shortest Path First, ospf) Routing Protocols
Discovering network topology is carried out, ensure that the rapidity and integrality of Topology Discovery.
4th, the present invention carries out LMSP Femto base stations using grouping Round Robin and (undertakes according to the topology information of acquisition
The base station of spare core net function) selection simultaneously networking, there is the flexibility of application.
Description of the drawings
Hereinafter, carry out the embodiment that the present invention will be described in detail with reference to attached drawing, wherein：
Fig. 1 shows the self-organizing of talk-around communication according to an embodiment of the invention of meeting an urgent need based on LTE Femtocell
System flow chart；
Fig. 2 shows the self-organizings of talk-around communication according to an embodiment of the invention of being met an urgent need based on LTE Femtocell
System database real-time synchronization conceptual scheme；
Fig. 3 shows a kind of Three-dimensional Mine underground LTE Femtocell base station deployment situation schematic diagrams；
Fig. 4 shows LTE Femtocell base station deployment situation schematic diagrams in a kind of a wide range of sparsity structure.
Specific embodiment
According to one embodiment of present invention, a kind of emergent talk-around communication based on LTE Femtocell technologies is provided
System, including multiple standard LTE Femtocell base stations and the spare LTE for being integrated in the standard LTE Femtocell base stations
Core net (spare LTE core network is referred to as off-grid EPC).
In the present embodiment, off-grid EPC is integrated in the component of each standard LTE Femtocell base stations, wherein starting de-
The LTE Femtocell base stations of net EPC are referred to as LMSP Femto base stations.Off-grid EPC is the LTE core network of clipped mistake, tool
There is the characteristics of load is small, low energy consumption, be more suitably applied to emergency communication.Off-grid EPC mainly includes network element mobility management entity
(i.e. MME, full name are Mobility Management Entity) and service gateway nodes (i.e. SGW, full name Serving
) and PDN Gateway node (i.e. PDN GateWay, be abbreviated as PGW) GateWay.Mobility management entity major function includes NAS
Signalling and safety management, mobile management and session management etc., wherein NAS full name are Non-access stratum, can
Non-Access Stratum is translated into, it is the functional layer between core net and user equipment, which supports the signaling between the two
And data transmission；Service gateway nodes are used to transmit user data by S1-U interface and user terminal, realize Lawful Interception, number
According to packet routing and forwarding；PDN (Public Data Network) gateway node be used for external network exchange data packets and
User terminal IP distribution etc..
LTE Femtocell meet an urgent need talk-around communication composition include user terminal, one or more LMSP Femto base stations with
And one or more common LTE Femtocell base stations.It is sent out for receiving user terminal wherein common LTE Femtocell base stations
Rise service request and the request is uploaded into corresponding off-grid EPC；LMSP Femto base stations are in addition to LTE
Outside the function of Femtocell base stations, the off-grid EPC in component is also started.Off-grid EPC is used to implement corresponding business processing.
LTE Femtocell talk-around communications of meeting an urgent need can be applied in a wide range of three-dimensional structure scene of coal mine, can also lead to
Satellite relay is crossed, the scene applied to the Belt and Road sparsity structure a wide range of in this way is medium.In specific implementation, it is contemplated that accident
The cut-out of emergent block supply is usually associated with, origin base station of meeting an urgent need starts reserve battery power supply.Carrying out emergent take off
Self-organization of network and during LMSP Femto base station selections in Network Communication, needs to consider off-grid EPC loads and LTE Femtocell
The problem of base station finite energy.
Fig. 1 shows the specific steps of the emergent talk-around communication based on above system, including：
Step 1：Database real-time synchronization.The log-on message of user, location information etc. are passed through into LTE core network database
In real-time synchronization to LTE Femtocell base stations off-grid EPC data library.
In LTE Femtocell communication systems, LTE core network and the synchronizing information of off-grid EPC are carried out.Synchronizing information packet
Include log-on message, context, location information of user etc..Synchronizing information method is by LTE core network database that information is real
When be synchronized in the off-grid EPC data library of LTE Femtocell base stations.Database real-time synchronization method is as shown in Fig. 2, when user is whole
End attachment is registered to when some LTE Femtocell base station is got on or between LTE Femtocell base stations due to position
When information changes and switches and relocate and user terminal information when entering and leaving communication range becomes
Change, the information of change is updated the off-grid to LTE Femtocell base stations by bottom read-write interface by LTE core network database
In the database of EPC.The function structure of database real-time synchronization includes database initialization module, the generation of SQL statement and holds
Row module, Initial DB-Sync modules, socket communication modules of bottom etc..In a preferred embodiment, in order to reduce
It is born caused by synchronizing process is to normal network communication, off-grid EPC is only to the log-on message of user terminal and location information
Real-time synchronization is carried out, and update is only synchronized to changed information, such as when UE leaves communication etc. necessary information
During range, solution registration is carried out, and solution log-on message is updated into off-grid EPC.When in communication, UE states do not change, it is
Without synchronizing information.Thus effectively reduce the communications burden caused by being synchronized to normal network.
Step 2：LTE Femtocell base stations off-grid judges.I.e. in LTE Femtocell communication systems, according to normal
SCTP is coupled situation during communication, and the automatic LTE Femtocell base stations off-grid that carries out judges.
The off-grid judgement of LTE Femtocell base stations refers to that, when communication accident occurs, LTE Femtocell base stations can be fast
Fast automatic decision itself is in off-grid state.Automatic decision LTE Femtocell base stations off-grid status method is to monitor positive normal open
SCTP is coupled situation during letter, when LTE Femtocell base station sides capture SCTP HeartBeat request bags by Libpcap
When SCTP HeartBeat are not heard in intervals confirms data packet, then automatic decision LTE Femtocell base stations
In off-grid state.In a preferred embodiment, in LTE Femtocell base station sides by the way that libpcap libraries is called to be compiled
The capture of Cheng Shixian SCTP data packets, by analysing whether in the intervals for receiving SCTP HeartBeat request bags
Receiving SCTP HeartBeat confirms data packet to judge that LTE Femtocell base stations are in off-grid state.
When Femtocell base stations are with LTE core network normal communication, information is transmitted by Stream Control Transmission Protocol.SCTP
HeartBeat requests are a kind of data types in Stream Control Transmission Protocol.The detection of link accessibility between base station and core net is
It is determined by sending HeartBeat packets.It is gone forward side by side by installing Libpcap function libraries in LTE Femtocell base station sides
Row programming, can monitor confirms number by the SCTP HeartBeat requests of LTE Femtocell base stations and SCTP HeartBeat
According to packet, both data packets can be Femtocell base stations send out can also to be Femtocell base stations receive from core net
's.
Step 3：Discovering network topology.When LTE Femtocell base stations are in off-grid state, its in current network is obtained
He can use off-grid LTE Femtocell base stations topology information, the IP including off-grid LTE Femtocell base stations, load and
Quantity information.
Specifically, in this step, region of meeting an urgent need in LTE Femtocell emergency communications carries out discovering network topology.It should
Anxious region is made of off-grid LTE Femtocell base stations and other equipment such as interchanger etc..What discovering network topology obtained
Information has：IP, load and the quantity information of off-grid LTE Femtocell base stations.Discovering network topology scheme is used and is based on
The Network Topology Discovery Algorithm of OSPF Routing Protocols.The program has many advantages, such as that topology discovery speed is fast, Topology Discovery is complete.Institute
The each off-grid LTE Femtocell base stations in emergent region are stated to go forward side by side by obtaining the LSA information of the LSU data packets of OSPF in network
Row parsing obtains the topology information in the entire emergent region.Wherein, LSU full name are Link State Update, can be translated into
Link state update.LSA full name are Link-State Advertisement, can be translated into Link State Advertisement.Topology information packet
Include IP, load information and the quantity information of off-grid LTE Femtocell base stations.Wherein, load information refers to the positive normal open in base station
The information of loading condition during letter, it is weighed by the CPU and EMS memory occupation situation of base station.In a preferred embodiment,
Load information is CPU usage and memory usage.The load of base station can reflect that the user of base station connects indirectly during normal communication
Enter amount and portfolio, when base station is in off-grid state, user volume is basically unchanged.The load of base station is most during such as normal communication
Greatly, it is also the largest relative to other load of base station when base station is in off-grid state.Base station when therefore can use normal communication
Loading condition is come the load of base station when replacing off-grid.Wherein, quantity information refers to the emergent available off-grid LTE in region
The quantity of Femtocell base stations hereinafter represents this quantity with n.
Step 4：It is preferred that LMSP Femto base stations.In LTE Femtocell emergency communications, according to the topology information,
It is preferred that LMSP Femto base stations and carrying out group-net communication.
In a preferred embodiment, LMSP Femto base station selections method is the scheme based on grouping Round Robin, should
Scheme can be applied to the scene of a variety of different emergency communications, such as three-D space structure or a wide range of sparsity structure.Wherein
It is by periodically choosing a certain number of LMSP in emergent region off-grid LTE Femtocell base stations to be grouped Round Robin
Femto base stations, and remaining off-grid LTE Femtocell base stations are grouped into each LMSP Femto base stations.
Specifically, the selection of LMSP Femto base stations and quantity is born according to current off-grid LTE Femtocell base stations
Load situation and off-grid LTE Femtocell base stations become what LMSP Femto base stations number determined.Off-grid LTE Femtocell
Load of base station refers to the load information in third step, such as CPU usage and memory usage.Load information is normalized
Itself and set threshold value T (G) are then compared by processing, if less than T (G), then it is assumed that the load of base station is smaller, this is taken off
LTE Femtocell base stations are netted as LMSP Femto base stations.The calculation formula of threshold value T (G) is as follows：
Wherein N represents the set of the emergent available off-grid LTE Femtocell base stations in region, and p can connect for single off-grid EPC
Enter the inverse of the quantity of LTE Femtocell base stations, r is the wheel number residing for current LMSP Femto base station selections, and mod functions are
Logarithm remainder.G represents not elected off-grid LTE Femtocell base stations, when r is the integral multiple of 1/p, represents all available
Off-grid LTE Femtocell base stations be all elected to wheel LMSP Femto base stations, at this time by all available off-grid LTE
Femtocell base stations, which are set to, was not elected to LMSP Femto base stations, so as to restart LMSP Femto base station selections.
With reference to above-mentioned formula, as r=0, T (G)=p, that is to say, that in an initial condition, all base stations are elected as
The probability of LMSP Femto base stations is all p.As r=(1-p)/p, T (G)=1, the base station for representing not to be elected at this time can
Serve as LMSP Femto base stations.As r=1/p, LMSP Femto base stations were all elected in base station, then LMSP is elected as in each base station
The probability of Femto base stations becomes p again.Based on said program, with the increase of r values, threshold value T (G) also gradually increases, but LMSP
The desired value of Femto total number of base will not become.
The grouping of off-grid LTE Femtocell base stations is that other off-grid base stations for not being elected as LMSP Femto base stations are averaged
It is assigned in the group of each LMSP Femto base stations, and is registered in the off-grid EPC of this group.
Emergency communication scheme of the emergent talk-around communication method of the present invention particularly suitable as certain specific application scenes.Example
Such as the underground LTE Femtocell communication systems of mine, (Fig. 3 shows a kind of Three-dimensional Mine underground LTE Femtocell base stations
Deployment scenario, figure interior joint represent underground LTE Femtocell base stations, and the connecting line between adjacent node represents a wired chain
Road), be suitable for the Belt and Road planning a wide range of sparsity structure in LTE Femtocell communication systems (Fig. 4 shows one
LTE Femtocell base station deployments situation in a wide range of sparsity structure of kind) etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of protection of the invention.
Claims (10)
1. a kind of emergent talk-around communication system based on LTE Femtocell technologies, including multiple LTE for being integrated with off-grid component
Femtocell base stations, the off-grid component include：
Spare LTE core network unit, under normal communication state, by the log-on message of the user terminal in emergency communication region
With location information local is synchronized to from LTE core network；LTE core network is served as under off-grid state；
Off-grid judging unit, for judge local LTE Femtocell base stations whether off-grid, and start in off-grid local
Discovering network topology unit；
Discovering network topology unit for carrying out discovering network topology in emergent region, obtains each off-grid in emergent region
The topological relation of LTE Femtocell base stations；And
The base station selected units of LMSP Femto, for being judged whether according to local load of base station and load threshold by local
LTE Femtocell are selected as base station to provide the LMSP of spare LTE core network service for other LTE Femtocell base stations
Femto base stations.
2. the emergent talk-around communication system according to claim 1 based on LTE Femtocell technologies, which is characterized in that
The spare LTE core network unit includes network element mobility management entity, service gateway nodes, public data network gateway node
And spare LTE core network database.
It is 3. a kind of emergent de- based on the emergent talk-around communication system described in claim 1 based on LTE Femtocell technologies
Network Communication method, includes the following steps：
1) under normal communication state, the registration of the user terminal in emergency communication region is believed in each LTE Femtocell base stations
Breath and location information are synchronized to from LTE core network in local spare LTE core network database；
2) each LTE Femtocell base stations judge itself whether off-grid, and in off-grid perform step 3)；
3) the LTE Femtocell base stations of each off-grid carry out discovering network topology in emergent region, obtain each in emergent region
The topological relation of the LTE Femtocell base stations of a off-grid；
4) the LTE Femtocell base stations of each off-grid judge whether to select oneself according to local load of base station and load threshold
For the LMSP Femto base stations of spare LTE core network service can be provided for other LTE Femtocell base stations.
4. emergent talk-around communication method according to claim 3, which is characterized in that in the step 1), LTE core network is only
It will be in the spare LTE core network database of changed synchronizing information to each LTE Femtocell base stations.
5. emergent talk-around communication method according to claim 4, which is characterized in that the step 1) further includes：Work as user
When terminal leaves communication range, solution registration is carried out and passes through LTE core network that log-on message update will be solved to each LTE
In the spare LTE core network database of Femtocell base stations, when the state of user terminal does not change, not to described
Spare LTE core network database carries out synchronizing information.
6. emergent talk-around communication method according to claim 4, which is characterized in that the LTE Femtocell base stations base
LTE core network is connected in SCTP mechanism；
The step 2) further includes：After LTE Femtocell base stations capture SCTP HeartBeat request bags, in a timing
Between be spaced in do not hear still SCTP HeartBeat confirmation data packet when, then automatic decision LTE Femtocell base stations are in
Off-grid state.
7. emergent talk-around communication method according to claim 4, which is characterized in that the step 3) further includes：In network
During Topology Discovery, the IP of each off-grid LTE Femtocell base stations and load and off-grid LTE Femtocell bases are obtained
The quantity information stood.
8. emergent talk-around communication method according to claim 4, which is characterized in that in the step 4), if by oneself
LMSP Femto base stations are selected as, then start the service function of spare LTE core network unit, are other LTE Femtocell base stations
Spare LTE core network service is provided.
9. emergent talk-around communication method according to claim 4, which is characterized in that in the step 4), the load threshold
Value becomes LMSP according to current off-grid LTE Femtocell load of base station situations and off-grid LTE Femtocell base stations
Femto base stations number determines.
10. emergent talk-around communication method according to claim 9, which is characterized in that in the step 4), each currently not
Elected off-grid LTE Femtocell base stations perform：Local load information is normalized；Calculate current load threshold
Value T (G)；By the local load information after normalized compared with current load threshold T (G), if less than T (G), it should
Off-grid LTE Femtocell base stations are as LMSP Femto base stations；
The computational methods of current load threshold T (G) are as follows：
Wherein N represents the set of the emergent available off-grid LTE Femtocell base stations in region, and p can access for single off-grid EPC
The inverse of the quantity of LTE Femtocell base stations, r are the wheel number residing for current LMSP Femto base station selections, and mod functions are pair
Numerical value remainder, G represent not elected off-grid LTE Femtocell base stations；
When r is the integral multiple of 1/p, represent that a wheel LMSP was all elected in all available off-grid LTE Femtocell base stations
All available off-grid LTE Femtocell base stations are set to were not elected to LMSP Femto base stations at this time by Femto base stations, from
And restart LMSP Femto base station selections.
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| CN201611254997.9A CN108271169B (en) | 2016-12-30 | 2016-12-30 | Emergency off-line communication system and method based on LTE Femtocell technology |
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| CN201611254997.9A CN108271169B (en) | 2016-12-30 | 2016-12-30 | Emergency off-line communication system and method based on LTE Femtocell technology |
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| CN108271169B CN108271169B (en) | 2021-06-15 |
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| CN101588566A (en) * | 2009-06-19 | 2009-11-25 | 中兴通讯股份有限公司 | Leather cellular base station and method for providing emergency service as well as mobile communication system |
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| CN102821377A (en) * | 2011-06-10 | 2012-12-12 | 中国科学院计算技术研究所 | Method for constructing emergency communication system and emergency communication system |
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| CN101588566A (en) * | 2009-06-19 | 2009-11-25 | 中兴通讯股份有限公司 | Leather cellular base station and method for providing emergency service as well as mobile communication system |
| US20110151837A1 (en) * | 2009-12-23 | 2011-06-23 | Winbush Iii Amos | Mobile communication device user content synchronization with central web-based records and information sharing system |
| CN102724665A (en) * | 2011-03-31 | 2012-10-10 | 中国联合网络通信集团有限公司 | Security certificate method of femtocell base station and femtocell wireless communication system |
| CN102821377A (en) * | 2011-06-10 | 2012-12-12 | 中国科学院计算技术研究所 | Method for constructing emergency communication system and emergency communication system |
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