CN102170626A - MME (mobility management entity)/UPE (user plane entity) reselection method and system of UE (user equipment) - Google Patents

Abstract

The invention discloses an MME (mobility management entity)/UPE (user plane entity) reselection method and system of UE (user equipment) which are applied to an evolved network. The system comprises an eNodeB (evolved NodeB) and an MME/UPE connected with the eNodeB, wherein the eNodeB is used for receiving a tracking area update request message initiated by the UE, selecting one MME/UPE meeting the highest quality of service from the MME/UPEs connected with the eNodeB to serve as the target MME/UPE after reselection, and sending an access request to the target MME/UPE; and the target MME/UPE is used for interacting with a service MME/UPE of the UE before reselection to obtain the mobility management context of the UE, and executing a position update register process of the UE to become the service MME/UPE of the UE after reselection. By adopting the method and system disclosed by the invention, the problem of communication quality drop or communication interrupt caused by excessively heavy load of the original service MME/UPE can be effectively avoided.

Description

Method and system for user equipment mobility management entity user plane entity reselection

technical field

The present invention relates to an evolved network, in particular to a method for reselecting a Mobility Management Entity (MME)/User Plane Entity (UPE) of a User Equipment (User Equipment, UE) in the evolved network.

Background technique

The Universal Mobile Telecommunications System (UMTS) is a third-generation mobile communication system that adopts WCDMA air interface technology, and the UMTS system is usually called a WCDMA communication system. The UMTS system adopts a structure similar to that of the second-generation mobile communication system, including a radio access network (Radio Access Network, RAN) and a core network (Core Network, CN). Among them, the wireless access network is used to handle all wireless-related functions, while the CN handles all voice calls and data connections in the UMTS system, and realizes switching and routing functions with external networks. CN is logically divided into Circuit Switched Domain (CS) and Packet Switched Domain (PS). UTRAN, CN and user equipment (User Equipment, UE) together constitute the entire UMTS system. Its system structure is shown in Fig. 1.

UTRAN is the terrestrial radio access network, which includes one or several radio network subsystems (Radio Network Subsystem, RNS). An RNS consists of a radio network controller (Radio Network Controller, RNC) and one or more base stations (NodeB). The interface between the RNC and the CN is the Iu interface, and the NodeB and the RNC are connected through the Iub interface. Inside the UTRAN, the radio network controllers are interconnected through the Iur interface, and the Iur interface can be connected through a direct physical connection between RNCs or through a transmission network. The RNC is used to allocate and control the wireless resources of the NodeB connected or related to it. The NodeB completes the conversion of the data flow between the Iub interface and the Uu interface, and also participates in a part of radio resource management. The structure of UTRAN is shown in Figure 2.

The core network structure of the 3G PS domain is shown in Figure 3, mainly including network elements: Serving GPRS Support Node (SGSN) and Gateway GPRS Support Node (Gateway GPRS Support Node, GGSN).

Among them, the SGSN is a basic network element of the PS network. Its main function is to forward the input/output IP packets for the UE in the service area of the SGSN, and its status is similar to that of the VMSC (Visited Mobile Switching Center) in the CS domain. In addition, the SGSN also integrates a function similar to the Visitor Location Register (VLR) in the CS network. When the user is in the Attached state, the SGSN stores the user information and location information related to the group. Similar to the VLR, most of the user information in the SGSN is obtained from the Home Location Register (HLR) during the location update process.

GGSN is also a network element functional entity introduced to provide PS service functions in the UMTS network, and provides routing and encapsulation of data packets between the PS network and the external data network.

Currently in 3GPP, manufacturers are actively researching Long Term Evolution (LTE) networks. The purpose of LTE is to provide a network that can reduce delay, increase user data rate, improve system capacity and low-cost coverage, and only use PS Domain services and the bearer network are all carried by IP.

A typical two-layer node evolution network architecture is shown in Figure 4, including:

LTE RAN: It is the wireless access network of the evolved network, which has the entity of the evolved network base station (Evolved NodeB, eNodeB) and saves the context in the radio access network (Radio Access Network, RAN) of the user equipment (User Equipment, UE) , which is logically called the long-term evolution radio access network entity (LTE-RAN Entity).

MME/UPE: It is a logical entity. The function of MME is to save the UE's mobility management (Mobility Management, MM) context, such as the user's identity, mobility status, tracking area (Tracking Area, TA) information, etc., and perform user Authentication; the function of the UPE is the entity that terminates the downlink data of the UE in the idle state, triggers paging at the same time, and saves the context of the UE, such as the IP address and routing information of the UE.

User Plane Anchor (User Plane Anchor): Associated with the UPE, the anchor of the user plane remains unchanged during the user's session.

Home Subscriber Server (HSS): Evolved HLR, associated with MME, stores and updates user registration information.

In the evolved network, MME/UPE and LTE-RAN Entity have a many-to-many relationship, that is, S1-flex. S1 is the interface between the evolved network RAN and the evolved packet core (Evolved Packet Core). As shown in Figure 5.

In an evolved network, the MME and the UPE are not necessarily located at the same physical node, nor are they limited to core network (CN) nodes. For example: it is possible that the UPE is located in EnodeB, and the MME is located in CN as a control plane node.

MME and UPE are not necessarily a node, they may be separated. Different MMEs and UPEs will be configured in a pool, and there will be a full connection with all eNodeBs that can provide services through the IP network, that is, logically configure a multipoint-to-multipoint network between MME/UPE and eNodeBs that can provide services Relationship. When the UE resides in a cell, the eNodeB will select a serving MME/UPE based on principles such as load balancing. When the UE in the idle (Idle) state moves between eNodeBs in the MME/UPE pool where the selected serving MME/UPE resides, it will always select the stationed MME/UPE as the serving MME/UPE. When the location update process occurs, only the eNodeB notifies the serving MME/UPE of the tracking area (Tracking Area, TA) information where the relevant UE is located, and the process of MME/UPE reselection does not occur. Figure 6 shows that after the UE moves to a different eNodeB, when a service arrives, the service flow will reach the UE through the original serving MME/UPE.

Because in the prior art, when the UE moves between eNodeBs in the same MME/UPE pool, it always selects the MME/UPE of the station as the serving MME/UPE; but when the serving MME/UPE is under heavy load, or the serving MME When the load of the link from the /UPE to the UE is too heavy, or the route is not optimized, if the serving MME/UPE is not replaced, the communication quality may be degraded or interrupted, which will have a great impact on user communication services.

Contents of the invention

The present invention provides a UE MME/UPE reselection method and system, which are used to solve the problem of communication quality caused by not performing a serving MME/UPE replacement when the UE moves between eNodeBs in the same MME/UPE pool in the prior art Problems with drop or loss of communication.

One aspect of the present invention provides a mobility management entity MME/user plane entity UPE reselection system of a user equipment UE, which is applied to an evolved network, including: a base station eNodeB and an MME/UPE connected to the base station eNodeB, wherein, The base station eNodeB is configured to, after receiving the tracking area update request message initiated by the UE, select an MME/UPE that satisfies the best service quality among the MME/UPEs connected to itself as the target MME/UPE after reselection; And send an access request to the target MME/UPE; the target MME/UPE is used to interact with the serving MME/UPE of the UE before reselection, and obtain the mobility management context of the UE; execute the UE The location update registration process becomes the serving MME/UPE of the UE after reselection.

Another aspect of the present invention also provides a method for reselecting the mobility management entity MME/user plane entity UPE of the user equipment UE, which is applied to the evolved network, including: the base station eNodeB, after receiving the tracking area update request message initiated by the UE, Selecting an MME/UPE that satisfies the best quality of service among the MME/UPEs connected to itself as the target MME/UPE after reselection; and sending an access request to the target MME/UPE so that the UE can communicate with the target MME /UPE location update registration process.

Another aspect of the present invention also provides a base station eNodeB of an evolved network, including:

A unit for receiving a tracking area update request message initiated by the UE;

A unit for selecting an MME/UPE that satisfies the best service quality among the MME/UPEs connected to itself as the target MME/UPE after reselection;

A unit for sending an access request to the target MME/UPE, so that the UE and the target MME/UPE are in a location update registration procedure.

The present invention has following beneficial effects:

(1) Since the reselection of the MME/UPE in the present invention is triggered by the UE through a normal location update process (periodic update or UE crossing the TA boundary), it has no impact on other processes and applications of the existing network, only the eNodeB Compare the service quality of each MME/UPE by reading a list in the background, and then decide whether to initiate the MME/UPE reselection process.

(2) Since the eNodeB can determine the priority of each connected MME/UPE and update the list through the background cycle, it has strong real-time performance and has no impact on the performance of the MME/UPE.

(3) The MME/UPE regularly sends parameters such as its own load to all eNodeBs connected to it, and the eNodeB can determine the service quality level of each MME/UPE, and the implementation method is simple; the eNodeB switches the UE's service MME/UPE to the service On the MME/UPE with a higher quality level, the problem of communication quality degradation or communication interruption caused by the overload of the original serving MME/UPE can be effectively avoided.

Description of drawings

FIG. 1 is a schematic structural diagram of a UMTS system;

Figure 2 is a schematic diagram of the UTRAN network structure;

FIG. 3 is a schematic diagram of a PS domain network structure;

FIG. 4 is a schematic diagram of an evolved network structure provided in the prior art;

Figure 5 is a schematic diagram of an evolved network shared S1-flex configuration;

FIG. 6 is a schematic diagram of a service traffic routing method in the prior art;

FIG. 7 is a schematic diagram of the service flow routing mode after serving MME/UPE reselection according to the present invention;

FIG. 8 is one of the MME/UPE reselection signaling procedures in the present invention;

FIG. 9 is the second signaling flow for performing MME/UPE reselection in the present invention.

Detailed ways

The present invention proposes a method for reselecting a serving MME/UPE by eNodeB according to the load status, route measurement or link status of the connected MME/UPE when UE initiates a Tracking Area (TA) update request. Specifically include:

When the eNodeB receives the tracking area update request message initiated by the UE, the eNodeB selects an MME/UPE that satisfies the best service quality among the MME/UPEs connected to itself as the target MME/UPE after reselection; and sends a message to the target MME /UPE sends an access request; the target MME/UPE makes an access decision to determine whether the eNodeB is allowed to access; the target MME/UPE interacts with the serving MME/UPE of the UE before reselection to obtain the mobility management context of the UE; the target MME The /UPE executes the location update registration process of the UE, and becomes the serving MME/UPE of the UE after reselection.

As shown in FIG. 7 , it is a schematic diagram of a service flow routing mode after serving MME/UPE reselection according to the present invention. In Fig. 7, the black solid line indicates the routing path of the service traffic that has not been reselected by the eNodeB, and the black dashed line indicates the routing path of the service traffic after the eNodeB reselection. That is: when the serving MME/UPE reselection is not performed, the serving MME/UPE of the UE is MME/UPE1, and after the serving MME/UPE reselection is performed according to the method of the present invention, the serving MME/UPE of the UE is MME/UPE3.

The flow chart of the UE triggering the eNodeB to select the serving MME/UPE due to the location update and the selection is successful is shown in Figure 8, including the following steps:

Step 1. The UE sends a TA update request to the eNodeB; the update request includes the Packet-Temporary Mobile Subscriber Identify (P-TMSI), the tracking area identifier (old TAI) before the UE location update, and the old packet Parameters such as temporary mobile subscriber identity signature (oldP-TMSI Signature) and update type (Update Type), the update reason can be periodic update or UE discovers that it has entered a new tracking area.

Step 2. After receiving the TA update request, the eNodeB obtains the address of the MME/UPE serving the UE from the above parameters, and selects an MME/UPE that satisfies the best service quality from all the MME/UPEs connected to itself as the address. Target MME/UPE after reselection;

There are many specific ways to select the MME/UPE with the best service quality, for example:

Method 1: After receiving the TA update request, the eNodeB immediately obtains the current state information of all MME/UPEs connected to it, and selects the MME/UPE that meets the best service quality as the target after reselection according to the state information MME/UPE;

Method 2: Set the quality of service level comparison table in the eNodeB, and the eNodeB periodically obtains the status information of all MME/UPEs connected to itself (for example: the MME/UPE sends parameters such as its own load to all eNodeBs connected to it at regular intervals) , and according to the obtained state information of each MME/UPE, determine the service quality level that the MME/UPE can satisfy, and update the service quality level comparison table;

After receiving the TA update request, the eNodeB queries the service quality level comparison table, and takes the MME/UPE with the highest service quality level as the target MME/UPE after reselection;

Method 3: After determining the service quality level corresponding to each MME/UPE according to method 2, the eNodeB arranges each MME/UPE in the order of the service quality level that can be satisfied from high to low or from low to high, and stores them in order to a local prioritized list;

After receiving the TA update request, the eNodeB selects the MME/UPE ranked first or last in the priority order list as the target MME/UPE after reselection;

Method 4: The eNodeB can also obtain the path metric values from the eNodeB to all connected MME/UPEs according to the routing metric information to each MME/UPE in the routing table; the eNodeB obtains the status information of each MME/UPE and Combined with the corresponding path metric value, determine the service quality level that each MME/UPE can satisfy, and store the MME/UPE and its corresponding service quality level information in a local service quality level comparison table;

After receiving the TA update request, the eNodeB queries the above-mentioned service quality level comparison table, and takes the MME/UPE with the highest service quality level as the target MME/UPE after reselection;

Method 5: After determining the service quality level corresponding to each MME/UPE according to method 4, the eNodeB arranges each MME/UPE according to the order of the service quality level that can be satisfied from high to low or from low to high, and stores them in order to a local prioritized list;

After receiving the TA update request, the eNodeB selects the MME/UPE ranked first or last in the priority order list as the target MME/UPE after reselection.

In the above manners, the status information of the MME/UPE includes but not limited to: the number of UEs connected to the MME/UPE in an active state, the number of UEs in an idle state, and/or CPU load status information.

In step 2, after the eNodeB determines the target MME/UPE, it also judges whether the target MME/UPE is the same MME/UPE as the serving MME/UPE of the UE before reselection; if not the same MME/UPE, continue to the step 3. If it is the same MME/UPE, there is no need to reselect the serving MME/UPE, and the reselection process is ended directly.

Step 3. The eNodeB sends an access request message to the selected target MME/UPE.

Step 4, the target MME/UPE determines whether to accept the access request (that is, whether to allow the UE to access) according to its latest load status and other parameters; if not, execute the process shown in Figure 9 (to be described later); if Accept the access request and proceed to step 5.

Step 5. The target MME/UPE sends a context transfer request to the serving MME/UPE of the UE before reselection, which contains some necessary information, such as P-TMSI, oldTAI, temporary logical link identifier (TLLI), old P -TMSI Signature and the address information of the target MME/UPE.

Step 6: The serving MME/UPE of the UE before reselection returns an MM Context response message, and transfers the MM Context of the UE to the target MME/UPE.

In step 7, a security authentication process may be performed between the UE and the target MME/UPE, and between the target MME/UPE and the HSS in the network.

Step 8: After passing the authentication, the target MME/UPE sends a confirmation message of receiving the MM context to the serving MME/UPE before reselection.

Step 9, the target MME sends a packet data protocol (Packet Data Protocol, PDP) context update request of the UE to the Anchor in the network; the PDP context request message includes the address information of the target MME/UPE, the tunnel end identifier (TEID), the service Quality negotiation (QoS Negotiated), serving network identity (serving network identity), global cell identity (Cell Global Identifier, CGI) or service area identity (Serving Area Identity, SAI), and radio access technology type (RAT type) and other parameters .

Step 10, Anchor updates the content of the PDP context field (PDP context fields) of this UE, and returns PDP context update response message, includes TEID in this response message, prohibits load compression (Prohibit Payload Compression) and access point name restriction ( APN Restriction) and other parameters.

Step 11, the target MME/UPE sends a location update message to the HSS.

Step 12. The HSS sends a location cancellation message to the pre-reselection serving MME/UPE, which may include the following parameters: International Mobile Subscriber Identity (IMSI) and Cancellation Type.

Step 13: The serving MME/UPE before reselection sends a location cancellation confirmation message to the HSS.

Step 14a, the HSS sends the subscription data of the user to the target MME/UPE;

Step 14b, after the target MME/UPE confirms that the UE is located in the new routing area, it creates a new mobility management context (MM context) for the UE, and returns an insert user data confirmation message to the HSS;

Step 14c, after receiving the confirmation message, the HSS returns a location update confirmation message to the target MME/UPE.

Step 15. The target MME/UPE sends a TA update acceptance message to the UE, including new P-TMSI, P-TMSI Signature, new TAI and other parameters.

Step 16, the UE returns a TA update complete message to the target MME/UPE.

The flow chart of UE triggering eNodeB to reselect MME/UPE due to location update and the selection fails is shown in Figure 9, including the following steps:

Step 1-3: Same as Step 1-3 in the process shown in Figure 8, not repeated;

Step 4. The target MME/UPE determines whether to allow the UE to access according to its latest load status and other parameters; if the judgment result is not allowed to access, continue to step 5;

Step 5, the target MME/UPE sends an access rejection message to the eNodeB;

Step 6. The eNodeB sends a TA update request message to the serving MME/UPE of the UE before reselection;

Step 7. The serving MME/UPE of the UE before reselection sends a TA update acceptance message to the UE, including parameters such as P-TMSI, P-TMSI Signature, and new TAI;

Step 8: The UE returns a TA update completion message to the serving MME/UPE of the UE before the reselection.

In the above method of the present invention, the target MME/UPE is located in the same resource pool as the serving MME/UPE of the UE before reselection.

In summary, since the reselection of the MME/UPE in the present invention is triggered by the UE through a normal location update process (periodic update or UE crossing the TA boundary), it has no impact on other processes and applications of the existing network, only The eNodeB needs to compare the service quality of each MME/UPE by reading a list in the background, and then decide whether to initiate the MME/UPE reselection process.

Since the eNodeB can determine the priority of each connected MME/UPE and update the list through the background cycle, it has strong real-time performance and has no impact on the performance of the MME/UPE.

The load and other parameters of the MME/UPE only need to be regularly sent to all eNodeBs connected to it, and the eNodeB can determine the service quality level of each MME/UPE, which is flexible and simple.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (27)

1. the Mobility Management Entity MME/ user entity UPE gravity treatment system of a user equipment (UE) is applied to evolvement network, it is characterized in that, comprising: base station eNodeB and the MME/UPE that is connected with described base station eNodeB, wherein,

Described base station eNodeB, be used to receive the tracing section updating request message that UE initiates after, with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment; And to described target MME/UPE transmission access request;

Described target MME/UPE is used for the serving MME/UPE of said UE before reselection alternately, obtains the MM Context of described UE; Carry out the position registration updating flow process of described UE, become the serving MME/UPE of described UE after the gravity treatment.

2. the system as claimed in claim 1 is characterized in that, the target MME/UPE that described base station eNodeB is used for after the MME/UPE that is connected with self selects a MME/UPE who satisfies the service quality optimum as gravity treatment specifically comprises:

Described eNodeB is used to obtain the current state information of all coupled MME/UPE, and according to state information, therefrom selects the target MME/UPE of MME/UPE after as gravity treatment that satisfies the service quality optimum.

3. the system as claimed in claim 1, it is characterized in that, described base station eNodeB, also be used for the service quality rating table of comparisons is being set itself, cycle is obtained the state information of all MME/UPE that are connected with self, and determine the service quality rating that corresponding MME/UPE can satisfy according to described state information, upgrade the described service quality rating table of comparisons.

4. system as claimed in claim 3 is characterized in that, described base station eNodeB also is used for according to routing table information the path metric value list being set, and stores the path metric value of described eNodeB to all MME/UPE that are connected; According to state information and the respective path metric of each MME/UPE that obtains, determine the service quality rating that each MME/UPE can satisfy, upgrade the described service quality rating table of comparisons.

5. system as claimed in claim 4, it is characterized in that, described base station eNodeB, also be used for the priority orders tabulation also is being set itself, with described MME/UPE according to its service quality rating that can satisfy from high to low or after the sequence arrangement from low to high, store in the tabulation of described priority orders the target MME/UPE of the MME/UPE that selects to be arranged in the described priority orders tabulation first or last after according to the order of sequence into as gravity treatment.

6. as the described system of the arbitrary claim of claim 2-5, it is characterized in that the state information of described MME/UPE comprises:

The UE quantity that is in state of activation that is connected with described MME/UPE, the UE quantity that is in idle condition and/or CUP load state information.

7. as the described system of the arbitrary claim of claim 1-5, it is characterized in that described base station eNodeB is used to also judge whether serving MME/UPE of described target MME/UPE and the preceding UE of gravity treatment is same MME/UPE; If not same MME/UPE, continue to carry out the described function that sends the request of access to described target MME/UPE; Otherwise, finish the MME/UPE reselection functionality.

8. as the described system of the arbitrary claim of claim 1-5, it is characterized in that described target MME/UPE also is used for judgement and whether accepts to insert request; If accept, continue to carry out the serving MME/UPE interactive function of described target MME/UPE and said UE before reselection; Otherwise, return access-reject message to described eNodeB;

After described eNodeB also was used to receive access-reject message, the serving MME of UE before gravity treatment/UPE sent the tracing section updating request message, carries out conventional tracing section updating function.

9. as the described system of the arbitrary claim of claim 1-5, it is characterized in that,

Described target MME/UPE also is used for the anchor point Anchor of network alternately, upgrades the data pack protocol PDP Context of described UE; Mutual with home subscriber servers HSS in the network, obtain the subscription data of described UE and upgrade positional information; Upgrade to described UE returning tracking district as the serving MME/UPE after the gravity treatment and to accept message, receive the tracing section updating that described UE returns and finish message.

10. as the described system of the arbitrary claim of claim 1-5, it is characterized in that the serving MME/UPE of described target MME/UPE and said UE before reselection is arranged in same resource pool.

11. the Mobility Management Entity MME/ user entity UPE reselecting method of a user equipment (UE) is applied to evolvement network, it is characterized in that, comprising:

Base station eNodeB, receive the tracing section updating request message that UE initiates after, with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment; And to described target MME/UPE transmission access request, so that UE and described target MME/UPE position registration updating flow process.

12. method as claimed in claim 11 is characterized in that, described method comprises:

Described eNodeB obtains the current state information of all coupled MME/UPE, and according to state information, therefrom selects the target MME/UPE of MME/UPE after as gravity treatment that satisfies the service quality optimum.

13. method as claimed in claim 11 is characterized in that, described method also comprises:

The service quality rating table of comparisons is set in described eNodeB, the described eNodeB cycle is obtained the state information of all MME/UPE that are connected with self, and determine the service quality rating that corresponding MME/UPE can satisfy according to described state information, upgrade the described service quality rating table of comparisons;

Described with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment specifically comprise: described eNodeB inquires about the described service quality rating table of comparisons, the target MME/UPE of the MME/UPE that service quality rating is the highest after as gravity treatment.

14. method as claimed in claim 13 is characterized in that, also comprises:

Described eNodeB is provided with the path metric value list according to routing table information, stores the path metric value of described eNodeB to all MME/UPE that are connected;

Described eNodeB determines the service quality rating that each MME/UPE can satisfy according to state information and the respective path metric of each MME/UPE that obtains, upgrades the described service quality rating table of comparisons.

15. method as claimed in claim 14 is characterized in that, also comprises:

Priority orders tabulation also is set in described eNodeB, and described eNodeB, stores described MME/UPE in the described priority orders tabulation from high to low or after the sequence arrangement from low to high according to the order of sequence according to its service quality rating that can satisfy;

Described with MME/UPE that self is connected in target MME/UPE after selecting a MME/UPE who satisfies the service quality optimum as gravity treatment specifically comprise: the target MME/UPE of the MME/UPE that described eNodeB selects to be arranged in the described priority orders tabulation first or last after as gravity treatment.

16., it is characterized in that the state information of described MME/UPE comprises as the described method of the arbitrary claim of claim 12-15:

The UE quantity that is in state of activation that is connected with described MME/UPE, the UE quantity that is in idle condition and/or CUP load state information.

17. as the described method of the arbitrary claim of claim 11-15, it is characterized in that, also comprise:

ENodeB judges whether serving MME/UPE of described target MME/UPE and the preceding UE of gravity treatment is same MME/UPE; If not same MME/UPE, continue to carry out the described flow process that sends the request of access to described target MME/UPE; Otherwise, finish MME/UPE gravity treatment flow process.

18. as the described method of the arbitrary claim of claim 11-15, it is characterized in that, also comprise:

Whether described target MME/UPE judgement accepts to insert request; If accept, continue to carry out the serving MME/UPE interaction flow of described target MME/UPE and said UE before reselection; Otherwise described target MME/UPE returns access-reject message to described eNodeB;

After described eNodeB received access-reject message, the serving MME of UE before gravity treatment/UPE sent the tracing section updating request message, carries out conventional tracing section updating flow process.

19. as the described method of the arbitrary claim of claim 11-15, it is characterized in that, also comprise:

Anchor point Anchor in described target MME/UPE and the network is mutual, upgrades the data pack protocol PDP Context of described UE;

Home subscriber servers HSS is mutual in described target MME/UPE and the network, obtains the subscription data of described UE and upgrades positional information;

Serving MME/the UPE of described target MME/UPE after as gravity treatment upgrades to described UE returning tracking district and accepts message, receives the tracing section updating that described UE returns and finishes message, process ends.

20., it is characterized in that the serving MME/UPE of described target MME/UPE and said UE before reselection is arranged in same resource pool as the described method of the arbitrary claim of claim 11-15.

21. the base station eNodeB of an evolvement network is characterized in that, comprising:

Be used to receive the unit of the tracing section updating request message that UE initiates;

The unit that is used for the target MME/UPE after the MME/UPE that is connected with self selects a MME/UPE who satisfies the service quality optimum as gravity treatment;

Be used for sending the unit of the request of access, so that UE and described target MME/UPE position registration updating flow process to described target MME/UPE.

22. base station as claimed in claim 21 is characterized in that, also comprises:

Be used to obtain the unit of the current state information of all coupled MME/UPE;

The described unit that is used for the target MME/UPE after the MME/UPE that is connected with self selects a MME/UPE who satisfies the service quality optimum as gravity treatment specifically is used for: according to state information, therefrom select the target MME/UPE of MME/UPE after as gravity treatment that satisfies the service quality optimum.

23. base station as claimed in claim 21 is characterized in that, also comprises:

Be used for being provided with the unit of the service quality rating table of comparisons at described eNodeB;

Being used for the cycle obtains the unit of the state information of all MME/UPE that are connected with self;

Be used for determining the service quality rating that corresponding MME/UPE can satisfy, upgrade the unit of the described service quality rating table of comparisons according to described state information;

The described unit that is used for the target MME/UPE after the MME/UPE that is connected with self selects a MME/UPE who satisfies the service quality optimum as gravity treatment specifically is used for: inquire about the described service quality rating table of comparisons, the target MME/UPE of the MME/UPE that service quality rating is the highest after as gravity treatment.

24. base station as claimed in claim 23 is characterized in that, also comprises:

Be used for according to routing table information, the unit of path metric value list is set;

Be used to store the unit of described eNodeB to the path metric value of all MME/UPE that are connected;

Be used for state information and respective path metric, determine the service quality rating that each MME/UPE can satisfy, upgrade the unit of the described service quality rating table of comparisons according to each MME/UPE that obtains.

25. base station as claimed in claim 24 is characterized in that, also comprises:

Be used to be provided with priority orders tabulation, from high to low or after the sequence arrangement from low to high, store described MME/UPE in the described priority orders tabulation unit according to its service quality rating that can satisfy according to the order of sequence;

The described unit that is used for the target MME/UPE after the MME/UPE that is connected with self selects a MME/UPE who satisfies the service quality optimum as gravity treatment specifically is used for: the target MME/UPE after selecting MME/UPE that described priority orders tabulation is arranged in first or last as gravity treatment.

26., it is characterized in that the state information of described MME/UPE comprises as the described base station of the arbitrary claim of claim 22-25:

The UE quantity that is in state of activation that is connected with described MME/UPE, the UE quantity that is in idle condition and/or CUP load state information.

27., it is characterized in that the serving MME/UPE of described target MME/UPE and said UE before reselection is arranged in same resource pool as the described method of the arbitrary claim of claim 21-25.

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