CN108271169B - Emergency off-line communication system and method based on LTE Femtocell technology - Google Patents

Emergency off-line communication system and method based on LTE Femtocell technology Download PDF

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CN108271169B
CN108271169B CN201611254997.9A CN201611254997A CN108271169B CN 108271169 B CN108271169 B CN 108271169B CN 201611254997 A CN201611254997 A CN 201611254997A CN 108271169 B CN108271169 B CN 108271169B
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base station
lte
femtocell base
emergency
offline
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CN108271169A (en
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韩雪
张玉成
石晶林
乔霞
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Beijing Sylincom Technology Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Abstract

The invention provides an emergency offline communication system based on an LTE Femtocell technology, which comprises an offline component, wherein the offline component comprises: the standby LTE core network unit is used for synchronizing the registration information and the position information of the user terminal in the emergency communication area from the LTE core network to the local; the offline judging unit is used for judging whether the local LTE Femtocell base station is offline or not and starting the local network topology discovering unit when the local LTE Femtocell base station is offline; the network topology discovery unit is used for acquiring the topological relation of each off-line LTE Femtocell base station in an emergency area; and the LMSP Femto base station selection unit is used for judging whether the local LTE Femtocell base station is selected as the LMSP Femto base station or not according to the local base station load and the load threshold value. The invention also provides a corresponding emergency off-line communication method. The invention can ensure the integrity of user information in emergency communication and can automatically carry out emergency networking communication without human intervention.

Description

Emergency off-line communication system and method based on LTE Femtocell technology
Technical Field
The invention relates to the technical field of communication, in particular to the technical field of emergency off-line communication.
Background
In the field of special communication with high natural or man-made communication accidents, an emergency communication mechanism is often needed to meet the requirements of production and life. The emergency offline communication means that when a normal LTE communication system has communication faults, communication access of an emergency area is achieved, so that continuous communication service is provided for users in the emergency area, and emergency rescue or other activities are conveniently conducted.
In the prior art, emergency communication is usually realized by adding a standby communication network. Emergency access to a maritime satellite based communication system, for example, in case of failure of the LTE network. However, in such emergency communication schemes, the emergency network and the normal communication network are two completely isolated networks, and the user information of the emergency network and the normal communication network is completely different, so that the user cannot naturally transit from the normal communication state to the emergency communication state, which causes inconvenience to the user. Also, this solution is costly since it requires the deployment of an additional set of communication networks.
On the other hand, the Femtocell technology is a home base station technology. Femtocell is also known as Femtocell. The femtocell uses IP protocol, can be connected by the existing ADSL, LAN and other broadband circuit of the user, and the remote end realizes the communication from IP network to mobile network by special gateway. Its size is similar to ADSL modem, and it has the features of convenient installation, automatic configuration, automatic network specification and plug-and-play. The Femtocell base station works in the authorized frequency band, the transmitting power is relatively small, generally in milliwatt level, and therefore energy is saved greatly. An access device of a Femtocell may typically support multiple mobile users and its air interface conforms to the LTE standard and is therefore suitable for any existing mobile terminal. The Femtocell can be converged by a Femtocell gateway at the network side by taking fixed broadband access as a backhaul network of the Femtocell, and a standard interface facing a mobile core network is provided, so that a user can access the mobile network.
In summary, based on the above features of the Femtocell technology, it is considered to provide an emergency offline communication solution capable of implementing smooth transition between normal communication and emergency communication by using the LTE Femtocell technology.
Disclosure of Invention
Therefore, the task of the present invention is to provide an emergency offline communication solution that enables a smooth transition between normal communication and emergency communication.
According to one aspect of the invention, an emergency offline communication system based on LTE Femtocell technology is provided, which comprises a plurality of LTE Femtocell base stations integrated with an offline component, wherein the offline component comprises:
the standby LTE core network unit is used for synchronizing the registration information and the position information of the user terminal in the emergency communication area from the LTE core network to the local area in the normal communication state; acting as an LTE core network in an off-line state;
the offline judging unit is used for judging whether the local LTE Femtocell base station is offline or not and starting the local network topology discovering unit when the local LTE Femtocell base station is offline;
the network topology discovery unit is used for carrying out network topology discovery in the emergency area to obtain the topological relation of each off-line LTE Femtocell base station in the emergency area; and
and the LMSP Femto base station selection unit is used for judging whether the local LTE Femtocell base station is selected as the LMSP Femtocell base station which can provide standby LTE core network service for other LTE Femtocell base stations according to the local base station load and the load threshold.
The standby LTE core network unit comprises a network element mobility management entity, a service gateway node, a public data network gateway node and a standby LTE core network database.
According to another aspect of the present invention, there is also provided an emergency offline communication method based on the emergency offline communication system based on LTE Femtocell technology, including the following steps:
1) under a normal communication state, each LTE Femtocell base station synchronizes the registration information and the position information of the user terminal in the emergency communication area from an LTE core network to a local standby LTE core network database;
2) each LTE Femtocell base station judges whether the LTE Femtocell base station is offline or not, and executes the step 3) when the LTE Femtocell base station is offline;
3) each offline LTE Femtocell base station carries out network topology discovery in an emergency area to obtain the topological relation of each offline LTE Femtocell base station in the emergency area;
4) and each off-line LTE Femtocell base station judges whether to select the off-line LTE Femtocell base station as an LMSP Femtocell base station capable of providing standby LTE core network service for other LTE Femtocell base stations according to the local base station load and the load threshold.
In the step 1), the LTE core network synchronizes only the changed information to the backup LTE core network database of each LTE Femtocell base station.
Wherein, the step 1) further comprises: when the user terminal leaves the communication range, the user terminal performs de-registration and updates de-registration information to the standby LTE core network databases of the LTE Femtocell base stations through the LTE core network, and when the state of the user terminal does not change, the information synchronization is not performed on the standby LTE core network databases.
The LTE Femtocell base station is connected with an LTE core network based on an SCTP mechanism;
the step 2) further comprises the following steps: when the LTE Femtocell base station captures an SCTP HeartBeat request packet and still does not monitor an SCTP HeartBeat confirmation data packet within a certain time interval, the LTE Femtocell base station is automatically judged to be in an off-line state.
Wherein the step 3) further comprises: in the network topology discovery process, the IP and the load of each off-line LTE Femtocell base station and the quantity information of the off-line LTE Femtocell base stations are obtained.
In the step 4), if the user selects the user as the LMSP Femto base station, the service function of the standby LTE core network unit is started, and a standby LTE core network service is provided for other LTE Femtocell base stations.
In the step 4), the load threshold is determined according to the load condition of the current off-line LTE Femtocell base station and the frequency of the off-line LTE Femtocell base station becoming the LMSP Femtocell base station.
In the step 4), each offline LTE Femtocell base station that is not currently selected executes: carrying out normalization processing on the local load information; calculating a current load threshold t (g); comparing the local load information after the normalization processing with a current load threshold value T (G), and if the local load information is smaller than the current load threshold value T (G), taking the off-line LTE Femtocell base station as an LMSP Femtocell base station;
the current load threshold t (g) is calculated as follows:
Figure GDA0003055521310000031
the method comprises the following steps that N represents a set of off-line LTE Femtocell base stations available in an emergency area, p is the reciprocal of the number of the LTE Femtocell base stations which can be accessed by a single off-line EPC, r is the number of rounds of current LMSP Femtocell base station selection, a mod function is a logarithm remainder, and G represents the off-line LTE Femtocell base stations which are not selected;
and when r is an integral multiple of 1/p, all available off-line LTE Femtocell base stations are selected to be a round of LMSP Femtocell base stations, and all available off-line LTE Femtocell base stations are set to be unselected LMSP Femtocell base stations, so that LMSP Femtocell base station selection is restarted.
Compared with the prior art, the invention has the following technical effects:
1. the emergency offline communication is synchronous with the user terminal information (namely UE information) in the normal communication state in real time, and the integrity of the user information is ensured in the emergency communication.
2. The LTE Femtocell base station does not need human intervention, and can automatically judge whether the LTE Femtocell base station is in an off-line state.
3. The invention carries out network topology discovery based on an Open Shortest Path First (OSPF) routing protocol, and ensures the rapidity and the integrity of topology discovery.
4. According to the obtained topology information, the LMSP Femto base station (namely the base station bearing the function of the standby core network) is selected and networked by adopting a grouping round robin mechanism, so that the method has application flexibility.
Drawings
Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 shows a flow diagram of an ad hoc system based on LTE Femtocell emergency offline communication according to an embodiment of the present invention;
fig. 2 is a diagram illustrating an ad hoc system database real-time synchronization scheme based on LTE Femtocell emergency offline communication according to an embodiment of the present invention;
FIG. 3 shows a schematic diagram of a three-dimensional mine downhole LTE Femtocell base station deployment;
fig. 4 shows a schematic diagram of LTE Femtocell base station deployment in a large-scale sparse structure.
Detailed Description
According to an embodiment of the invention, an emergency offline communication system based on an LTE Femtocell technology is provided, which includes a plurality of standard LTE Femtocell base stations and a standby LTE core network (the standby LTE core network may also be referred to as an offline EPC) integrated in the standard LTE Femtocell base stations.
In this embodiment, the offline EPC is integrated in the component of each standard LTE Femtocell base station, where the LTE Femtocell base station that starts the offline EPC is referred to as an LMSP Femtocell base station. The off-line EPC is a tailored LTE core network, has the characteristics of small load and low energy consumption, and is more suitable for emergency communication. The off-line EPC mainly includes a network element Mobility Management Entity (i.e., MME), a Serving GateWay node (i.e., SGW), and a PDN GateWay node (i.e., PDN GateWay, abbreviated PGW). The main functions of the mobility management entity include NAS signaling transmission and security management, mobility management and session management, etc., wherein NAS is called Non-access stratum, which can be translated into a Non-access stratum, and is a functional layer between a core network and user equipment, and the functional layer supports signaling and data transmission between the core network and the user equipment; the service gateway node is used for transmitting user data with the user terminal through an S1-U interface to realize lawful monitoring, data packet routing and forwarding; pdn (public Data network) gateway node is used to exchange packets with external networks, and to allocate IP to user terminals, etc.
The LTE Femtocell emergency off-line communication component comprises a user terminal, one or more LMSP Femtocell base stations and one or more common LTE Femtocell base stations. The common LTE Femtocell base station is used for receiving a service request initiated by a user terminal and uploading the request to a corresponding offline EPC; in addition to having the functionality of an LTE Femtocell base station, an LMSP Femto base station also initiates an off-line EPC in the assembly. The off-line EPC is used for realizing corresponding service processing.
The LTE Femtocell emergency off-line communication can be applied to a large-range three-dimensional structure scene of a coal mine, and can also be applied to a large-range sparse structure scene through satellite relay. In particular implementation, emergency area base stations initiate backup battery power, considering that an accident often occurs with the emergency area power cut-off. When network self-organization and LMSP Femto base station selection are carried out in emergency off-line communication, the problems of off-line EPC load and limited energy of an LTE Femtocell base station need to be considered.
Fig. 1 shows the specific steps of emergency off-line communication based on the above system, including:
step 1: the databases are synchronized in real time. Namely, the registration information, the position information and the like of the user are synchronized into an LTE Femtocell base station offline EPC database in real time through an LTE core network database.
In an LTE Femtocell communication system, information synchronization between an LTE core network and an off-line EPC is performed. The synchronization information includes registration information, context, location information, etc. of the user. The information synchronization method is to synchronize information to an LTE Femtocell base station offline EPC database in real time through an LTE core network database. As shown in fig. 2, when a user terminal is attached to and registered with a certain LTE Femtocell base station, or when handover and relocation occur between LTE Femtocell base stations due to change of location information, and information changes when the user terminal enters and leaves a communication range, an LTE core network database updates the changed information to a database of an off-network EPC of the LTE Femtocell base station through a bottom layer read-write interface. The functional architecture of the real-time database synchronization comprises a database initialization module, an SQL statement generation and execution module, an Initial DB-Sync module, a bottom socket communication module and the like. In a preferred embodiment, in order to reduce the burden on normal network communication due to the synchronization process, the off-line EPC synchronizes only the necessary information, such as registration information and location information of the UE, in real time, and synchronously updates only the changed information, for example, when the UE leaves the communication range, performs de-registration and updates the de-registration information into the off-line EPC. When the UE state does not change during communication, information synchronization is not performed. Therefore, the communication burden caused by synchronization to a normal network is effectively reduced.
Step 2: and (4) judging the offline of the LTE Femtocell base station. Namely, in the LTE Femtocell communication system, according to the SCTP coupling condition in normal communication, the LTE Femtocell base station offline judgment is automatically carried out.
The LTE Femtocell base station offline judgment means that the LTE Femtocell base station can quickly and automatically judge that the LTE Femtocell base station is in an offline state when a communication accident occurs. The method for automatically judging the off-line state of the LTE Femtocell base station is to monitor the SCTP coupling condition during normal communication, and when the SCTP HeartBeat confirmation data packet is not monitored in a certain time interval of capturing an SCTP HeartBeat request packet by the LTE Femtocell base station side through Libpcap, the LTE Femtocell base station is automatically judged to be in the off-line state. In a preferred embodiment, the capturing of the SCTP data packet is realized by calling a libpcap library to program at the LTE Femtocell base station side, and the LTE Femtocell base station is judged to be in an off-line state by analyzing whether the SCTP HeartBoard verification data packet is received within a certain time interval after the SCTP HeartBoard request packet is received.
And when the Femtocell base station is normally communicated with the LTE core network, the information is transmitted through the SCTP. The SCTP HeartBeat request is a data type in the SCTP protocol. The detection of link reachability between the base station and the core network is determined by sending a HeartBeat packet. By installing the Libpcap function library on the LTE Femtocell base station side and programming, the SCTP HeartBrant request and the SCTP HeartBrant confirmation data packets passing through the LTE Femtocell base station can be monitored, and the two data packets can be sent by the Femtocell base station or received by the Femtocell base station from a core network.
And step 3: and discovering the network topology. When the LTE Femtocell base station is in an off-line state, acquiring topology information of other available off-line LTE Femtocell base stations in the current network, including IP, load and quantity information of the off-line LTE Femtocell base stations.
Specifically, in this step, network topology discovery is performed in an emergency area in LTE Femtocell emergency communication. The emergency area is composed of an off-line LTE Femtocell base station and other equipment such as a switch. The information obtained by network topology discovery includes: IP, load and quantity information of the off-line LTE Femtocell base station. The network topology discovery scheme adopts a network topology discovery algorithm based on an OSPF routing protocol. The scheme has the advantages of high topology discovery speed, complete topology discovery and the like. And each off-line LTE Femtocell base station in the emergency area acquires and analyzes LSA information of an LSU data packet of OSPF in the network to acquire topology information of the whole emergency area. The LSU is called Link State Update, and can be translated into a Link State Update. LSA is called Link-State Advertisement and can be translated into Link State broadcast. The topology information comprises IP, load information and quantity information of the off-line LTE Femtocell base station. The load information refers to information of a load condition when the base station normally communicates, and is measured by the CPU and memory occupation condition of the base station. In a preferred embodiment, the load information is CPU occupancy and memory occupancy. The load of the base station during normal communication can indirectly reflect the user access amount and the service amount of the base station, and the user amount of the base station is basically unchanged when the base station is in an offline state. If the base station has the largest load during normal communication, the base station has the largest load relative to other base stations when in an offline state. Therefore, the load of the base station during the offline can be replaced by the load of the base station during the normal communication. The quantity information refers to the quantity of the offline LTE Femtocell base stations available in the emergency area, and the quantity is represented by n in the following.
And 4, step 4: preferably an LMSP Femto base station. In the LTE Femtocell emergency communication, the LMSP Femto base station is optimized and networking communication is carried out according to the topology information.
In a preferred embodiment, the LMSP Femto base station selection method is a scheme based on a grouping round robin mechanism, and the scheme can be applied to various emergency communication scenes such as a three-dimensional space structure or a large-range sparse structure. The grouping round robin mechanism is that a certain number of LMSP Femtocell base stations are selected from the offline LTE Femtocell base stations in the emergency area at fixed time, and the rest of the offline LTE Femtocell base stations are grouped into each LMSP Femtocell base station.
Specifically, the selection of the LMSP Femto base stations and the number of the LMSP Femto base stations is determined according to the load condition of the current off-line LTE Femtocell base station and the frequency of the off-line LTE Femtocell base station becoming the LMSP Femto base station. The off-line LTE Femtocell base station load refers to load information in the third step, such as CPU occupancy and memory occupancy. And normalizing the load information, comparing the load information with a set threshold value T (G), if the load information is less than T (G), considering that the load of the base station is less, and taking the off-line LTE Femtocell base station as an LMSP Femtocell base station. The threshold value t (g) is calculated as follows:
Figure GDA0003055521310000071
wherein N represents a set of off-line LTE Femtocell base stations available in an emergency area, p is the reciprocal of the number of the LTE Femtocell base stations accessible to a single off-line EPC, r is the number of rounds of selection of the current LMSP Femtocell base station, and a mod function is a logarithm remainder. G represents an unselected offline LTE Femtocell base station, when r is an integral multiple of 1/p, all available offline LTE Femtocell base stations are selected for one round of LMSP Femtocell base stations, and at the moment, all available offline LTE Femtocell base stations are set as the unselected LMSP Femtocell base stations, so that LMSP Femtocell base station selection is restarted.
Referring to the above formula, when r is 0, t (g) is p, that is, the probability that all base stations are selected as LMSP Femto base stations under the initial condition is p. When r is (1-p)/p, t (g) is 1, which means that the base stations not selected at this time can all serve as LMSP Femto base stations. When r is 1/p, the base stations all have elected the LMSP Femto base station, and the probability that each base station is elected the LMSP Femto base station becomes p again. Based on the above scheme, as the value of r increases, the threshold value T (G) also gradually increases, but the expected value of the total number of LMSP Femto base stations does not change.
The grouping of the off-line LTE Femtocell base stations is to evenly distribute other off-line base stations which are not selected as LMSP Femto base stations into each group of LMSP Femto base stations and register the other off-line base stations into an off-line EPC of the group.
The emergency offline communication method is particularly suitable for being used as an emergency communication scheme in certain specific application scenes. For example, the downhole LTE Femtocell communication system of a mine (fig. 3 shows a deployment situation of a three-dimensional downhole LTE Femtocell base station of a mine, a node in the figure represents the downhole LTE Femtocell base station, and a connecting line between adjacent nodes represents a wired link), and the system is suitable for the LTE Femtocell communication system in a large-scale sparse structure (fig. 4 shows a deployment situation of the LTE Femtocell base station in the large-scale sparse structure), and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. An emergency off-line communication system based on LTE Femtocell technology, comprising a plurality of LTE Femtocell base stations integrated with off-line components, the off-line components comprising:
the standby LTE core network unit comprises a network element mobility management entity, a service gateway node, a public data network gateway node and a standby LTE core network database, and is used for synchronizing the registration information and the position information of the user terminal in the emergency communication area from the LTE core network to the local area in the normal communication state; acting as an LTE core network in an off-line state;
the offline judging unit is used for judging whether the local LTE Femtocell base station is offline or not and starting the local network topology discovering unit when the local LTE Femtocell base station is offline;
the network topology discovery unit is used for carrying out network topology discovery in the emergency area to obtain the topological relation of each off-line LTE Femtocell base station in the emergency area; and
and the LMSP Femto base station selection unit is used for judging whether the local LTE Femtocell base station is selected as the LMSP Femtocell base station which can provide standby LTE core network service for other LTE Femtocell base stations according to the local base station load and the load threshold.
2. An emergency offline communication method based on the emergency offline communication system based on the LTE Femtocell technology in claim 1, comprising the following steps:
1) under a normal communication state, each LTE Femtocell base station synchronizes the registration information and the position information of the user terminal in the emergency communication area from an LTE core network to a local standby LTE core network database;
2) each LTE Femtocell base station judges whether the LTE Femtocell base station is offline or not, and executes the step 3) when the LTE Femtocell base station is offline;
3) each offline LTE Femtocell base station carries out network topology discovery in an emergency area to obtain the topological relation of each offline LTE Femtocell base station in the emergency area;
4) and each off-line LTE Femtocell base station judges whether to select the off-line LTE Femtocell base station as an LMSP Femtocell base station capable of providing standby LTE core network service for other LTE Femtocell base stations according to the local base station load and the load threshold.
3. The emergency offline communication method according to claim 2, wherein in step 1), the LTE core network synchronizes only the changed information to the backup LTE core network database of each LTE Femtocell base station.
4. The emergency talk-around communication method according to claim 3, wherein the step 1) further comprises: when the user terminal leaves the communication range, the user terminal performs de-registration and updates de-registration information to the standby LTE core network databases of the LTE Femtocell base stations through the LTE core network, and when the state of the user terminal does not change, the information synchronization is not performed on the standby LTE core network databases.
5. The emergency talk-around communication method according to claim 3,
the LTE Femtocell base station is connected with an LTE core network based on an SCTP mechanism;
the step 2) further comprises the following steps: when the LTE Femtocell base station captures an SCTP HeartBeat request packet and still does not monitor an SCTP HeartBeat confirmation data packet within a certain time interval, the LTE Femtocell base station is automatically judged to be in an off-line state.
6. The emergency talk-around communication method according to claim 3, wherein the step 3) further comprises: in the network topology discovery process, the IP and the load of each off-line LTE Femtocell base station and the quantity information of the off-line LTE Femtocell base stations are obtained.
7. The emergency offline communication method according to claim 3, wherein in step 4), if the selected terminal is the LMSP Femto base station, the service function of the standby LTE core network unit is started to provide the standby LTE core network service for other LTE Femtocell base stations.
8. The emergency offline communication method according to claim 3, wherein in the step 4), the load threshold is determined according to a load condition of the current offline LTE Femtocell base station and a frequency of the offline LTE Femtocell base station becoming an LMSP Femtocell base station.
9. The emergency offline communication method according to claim 8, wherein in step 4), each offline LTE Femtocell base station that is not currently selected performs: carrying out normalization processing on the local load information; calculating a current load threshold t (g); comparing the local load information after the normalization processing with a current load threshold value T (G), and if the local load information is smaller than the current load threshold value T (G), taking the off-line LTE Femtocell base station as an LMSP Femtocell base station;
the current load threshold t (g) is calculated as follows:
Figure FDA0003055521300000021
the method comprises the following steps that N represents a set of off-line LTE Femtocell base stations available in an emergency area, p is the reciprocal of the number of the LTE Femtocell base stations which can be accessed by a single off-line EPC, r is the number of rounds of current LMSP Femtocell base station selection, a mod function is a logarithm remainder, and G represents the off-line LTE Femtocell base stations which are not selected;
and when r is an integral multiple of 1/p, all available off-line LTE Femtocell base stations are selected to be a round of LMSP Femtocell base stations, and all available off-line LTE Femtocell base stations are set to be unselected LMSP Femtocell base stations, so that LMSP Femtocell base station selection is restarted.
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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
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