Method and apparatus for ue access

Abstract

The application discloses a method and device related to UE access, the method comprises: establishing a radio resource control (RRC) connection with a user equipment (UE); after establishing the RRC connection, sending an initial UE message to an entity for managing the mobility of the UE; receiving an initial UE context establishment request message based on the initial UE message from the entity, the initial UE context establishment request message comprising information about the service type for the UE; and based on a target base station identified during the RRC connection, sending a handover request message for the handover of the UE to the target base station. By applying the application, the method and device for selecting different types of access networks for different types of users can meet the needs of users, thereby improving the utilization of the network.

Description

[0001] This application is a divisional application of patent application No. 201510508367.9, with the title of "Method and device for UE access", filed on August 18, 2015. TECHNICAL FIELD

[0002] The present application relates to wireless communication technology, in particular to a method and device for providing different access networks according to different requirements of a UE. BACKGROUND

[0003] Modern mobile communication is increasingly moving towards providing multimedia services with high transmission rate for users, such as Figure 1 Fig. 1 shows a system architecture diagram of system architecture evolution (SAE). In which:

[0004] The user equipment (UE) 101 is a terminal device for receiving data. The evolved universal terrestrial radio access network (E-UTRAN) 102 is a wireless access network, which includes a macro base station (eNodeB / NodeB) for providing a wireless network interface for the UE. The mobile management entity (MME) 103 is responsible for managing the mobile context, session context and security information of the UE. The serving gateway (SGW) 104 mainly provides the function of user plane, and the MME 103 and the SGW 104 can be in the same physical entity. The packet data network gateway (PGW) 105 is responsible for charging, lawful interception and other functions, and can also be in the same physical entity as the SGW 104. The policy and charging rules function entity (PCRF) 106 provides quality of service (QoS) policy and charging criteria. The universal packet radio service support node (SGSN) 108 is a network node device for providing routing for data transmission in the universal mobile communication system (UMTS). The home subscriber server (HSS) 109 is the home subscriber subsystem of the UE, which is responsible for protecting user information including the current location of the user equipment, the address of the service node, the security information of the user, the packet data context of the user equipment, etc.

[0005] In the future, the LTE evolved network will support various user types, such as smart home appliances and intelligent sensing devices on vehicle systems. Different types of users have different requirements. Some types of users have high requirements on transmission delay, which are referred to as critical mechanism type communication (C-MTC) users. Some types of users have low requirements on transmission delay, but require frequent establishment of data paths to transmit small data of a few bits, which are referred to as massive mechanism type communication (M-MTC) users. For such users, the signaling process required for data establishment needs to be reduced, and the load of the control plane needs to be reduced. In general, different types of users have different requirements on the network, and the current LTE network architecture uses a general access network to provide services for all users. This architecture cannot flexibly adapt to the requirements of different users, and the utilization of the network is not maximized. SUMMARY

[0006] Therefore, the present application provides a method and device for selecting different types of access networks for different types of users, so that the requirements of users can be met, and the utilization of the network is improved.

[0007] The present application provides a method for UE access, comprising:

[0008] The UE receives type information supported by a cell broadcasted by a base station, wherein the type information supported by the cell comprises types of UEs supported by the cell.

[0009] The UE selects a cell supporting the type of the UE according to a comparison between the type of the UE and the types of UEs supported by the cell, and sends an RRC establishment request message, wherein the RRC establishment request message comprises the type of the UE.

[0010] The present application also provides a UE, comprising a first receiving module and a first sending module, wherein:

[0011] The first receiving module is configured to receive type information supported by a cell broadcasted by a base station, wherein the type information supported by the cell comprises types of UEs supported by the cell.

[0012] The first sending module is configured to select a cell supporting the type of the UE according to a comparison between the type of the UE and the types of UEs supported by the cell, and send an RRC establishment request message.

[0013] The present application also provides a method for UE access, comprising:

[0014] The base station broadcasts cell supported type information on the cell of the base station, the cell supported type information comprising: a type of UE supported by the cell;

[0015] The base station receives an RRC setup request message sent by the UE.

[0016] Preferably, the method further comprises: if the type of the UE is not included in the RRC setup request message, the base station switches the UE to a neighboring base station supporting a general UE type.

[0017] Preferably, the method further comprises: the base station acquires and saves the cell supported type information on the neighboring base station in the process of X2 setup.

[0018] The application further provides a base station, comprising: a second sending device and a second receiving device, wherein:

[0019] The second sending device is configured to broadcast cell supported type information on the cell of the base station, the cell supported type information comprising: a type of UE supported by the cell.

[0020] The second receiving device is configured to receive an RRC setup request message sent by the UE.

[0021] The application further provides a method for UE access, comprising:

[0022] The UE sends an RRC setup request message to a base station, the RRC setup request message comprising type information, the type information comprising: a type of the UE.

[0023] The UE receives an RRC setup response message or a redirection message from the base station, the redirection message comprising an identity of a destination base station and / or a cell unique identity or a physical layer identity of a target cell, the destination base station or the target cell supporting the type corresponding to the type information.

[0024] Preferably, if the UE receives the RRC setup response message from the base station, the method further comprises:

[0025] After the RRC setup process is completed, the UE receives the redirection message from the base station or is switched to a target base station by the base station, wherein the target base station supports the type corresponding to the type information.

[0026] The application further provides a UE, comprising: a third sending module and a third receiving module, wherein:

[0027] The third sending module is configured to send an RRC setup request message to a base station, the RRC setup request message comprising type information, the type information comprising: a type of the UE.

[0028] The third receiving module is configured to receive an RRC setup response message or a redirection message from the base station, wherein the redirection message comprises an identifier of a target base station and / or a cell unique identifier or a physical layer identifier of a target cell, and the target base station or the target cell supports the type corresponding to the type information.

[0029] The application further provides a method for UE access, comprising:

[0030] The base station receives an RRC setup request message from the UE, wherein the RRC setup request message comprises type information, and the type information comprises a type of the UE.

[0031] If the base station does not support the type corresponding to the type information, the base station redirects the UE to a target base station supporting the type or switches the UE to a target base station supporting the type.

[0032] Preferably, the redirection of the UE to the target base station supporting the type comprises:

[0033] After the base station receives the RRC setup request message from the UE or after the completion of the RRC setup process, the base station searches for a target base station supporting the type from neighboring base stations and sends a redirection message to the UE, wherein the redirection message comprises an identifier of the target base station and / or a cell unique identifier or a physical layer identifier of a target cell, and the target base station or the target cell supports the type corresponding to the type information.

[0034] Preferably, the switching of the UE to the target base station supporting the type comprises:

[0035] After the completion of the RRC setup process, the base station switches the UE to a target base station supporting the type.

[0036] Preferably, the method further comprises:

[0037] The base station acquires and saves type information supported by cells on neighboring base stations in an X2 setup process.

[0038] The application further provides a base station, comprising a fourth receiving module and a fourth processing module, wherein:

[0039] The fourth receiving module is configured to receive an RRC setup request message from the UE, wherein the RRC setup request message comprises type information, and the type information comprises a type of the UE.

[0040] The fourth processing module is configured to redirect the UE to a target base station supporting the type or switch the UE to a target base station supporting the type when the base station does not support the type corresponding to the type information.

[0041] The application further provides a method for UE access, comprising:

[0042] The base station receives type information of the UE from a core network device, wherein the type information comprises a type of the UE.

[0043] If the base station does not support the type corresponding to the type information, the base station switches the UE to a target base station supporting the type.

[0044] Preferably, the method further comprises:

[0045] The base station acquires and saves type information of cells supported by neighbor base stations in an X2 establishment process.

[0046] The application further provides a base station, comprising a fifth receiving module and a fifth switching module, wherein:

[0047] The fifth receiving module is used for receiving type information of the UE from a core network device, wherein the type information comprises a type of the UE.

[0048] The fifth switching module is used for switching the UE to a target base station supporting the type when the base station does not support the type corresponding to the type information.

[0049] The application further provides a method for UE access, comprising:

[0050] The core network device receives an initial UE message from a base station.

[0051] The core network device sends type information of the UE to the base station, wherein the type information comprises a type of the UE.

[0052] The application further provides a core network device, comprising a sixth receiving module and a sixth sending module, wherein:

[0053] The sixth receiving module is used for receiving an initial UE message from a base station.

[0054] The sixth sending module is used for sending type information of the UE to the base station, wherein the type information comprises a type of the UE.

[0055] The application further provides a method for UE access, comprising:

[0056] The core network device receives an initial UE message from a base station, wherein the message contains an identity of the UE.

[0057] If the core network device does not support the type of the UE, the core network device finds a target core network device supporting the type of the UE, and sends an identifier of the target core network device and / or type information of the UE to the base station through a redirection message.

[0058] The application further provides a core network device, comprising a seventh receiving module and an eighth redirection module, wherein:

[0059] The seventh receiving module is configured to receive an initial UE message from a base station, the message containing an identifier of a UE.

[0060] The eighth redirection module is configured to, when the core network device does not support the type of the UE, find a target core network device supporting the type of the UE, and send an identifier of the target core network device and / or type information of the UE to the base station through a redirection message.

[0061] The application further provides a method for UE access, comprising:

[0062] The base station sends an initial UE message to a core network device, the message containing an identifier of a UE.

[0063] The base station receives a redirection message from the core network device, the redirection message containing an identifier of a target core network device and / or type information of the UE, wherein the target core network device supports the type of the UE.

[0064] Preferably, if the redirection message only contains the identifier of the target core network device, the method further comprises: determining the type information of the UE according to the identifier of the target core network device and pre-configured information, wherein the type information of the UE comprises the type of the UE.

[0065] Preferably, the method further comprises:

[0066] According to the type information of the UE, if the base station does not support the type corresponding to the type information, or there is a dedicated base station corresponding to the type in a neighboring base station, the UE is switched to a base station supporting the type corresponding to the type information or the dedicated base station.

[0067] The application further provides a base station, comprising an eighth sending module and an eighth receiving module, wherein:

[0068] The eighth sending module is configured to send an initial UE message to a core network device, the message containing an identifier of a UE.

[0069] The eighth receiving module is configured to receive a redirection message from the core network device, wherein the redirection message comprises an identifier of a target core network device and / or type information of the UE, and the target core network device supports the type of the UE.

[0070] The present application provides a new network architecture, and also provides a method for selecting a suitable access network for a UE under the new network architecture. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 An existing SAE system architecture diagram;

[0072] Figure 2 An architecture diagram of a special access system of the present application;

[0073] Figure 3 A method diagram for selecting a suitable access network device for a UE of the present application;

[0074] Figure 4 A signaling flow diagram of a method for notifying a base station of a UE type by a UE of the present application, and for the base station to determine whether to allow the UE to access;

[0075] Figure 5 A signaling flow diagram of another method for notifying a base station of a UE type by a UE of the present application, and for the base station to determine whether to allow the UE to access;

[0076] Figure 6 A signaling flow diagram of a method for indicating a UE type to a base station by a core network of the present application, and for the base station to determine whether to allow the UE to access;

[0077] Figure 7 A signaling flow diagram of another method for indicating a UE type to a base station by a core network of the present application, and for the base station to determine whether to allow the UE to access;

[0078] Figure 8 A diagram for exchanging a UE type by a base station in an X2 handover of the present application. DETAILED DESCRIPTION

[0079] In order to make the purposes, technical means and advantages of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings.

[0080] Figure 2 An architecture diagram of a special access system of the present application. The architecture comprises a user equipment (201), a special access network device (202) and a core network device (203), wherein:

[0081] User Equipment (UE): According to different requirements of UE's features or UE's applied service type, UE can be divided into different types, such as M-MTC, C-MTC.

[0082] Dedicated Access Network Equipment: Dedicated Access Network Equipment includes base station (eNB) which supports certain type of UE. Cell on general eNB can support all types of UE, and the cell which supports all types of UE is called general cell. Dedicated eNB is designed for certain type of UE, and cell on eNB only supports certain type of UE, such as only supports M-MTC user, according to specific type of UE, access network optimizes configuration of wireless channel, which can improve performance of specific type of UE, but is not suitable for all types of UE. Cell which only supports specific type of UE is called dedicated cell. eNB can contain multiple cells, and according to different combinations, dedicated access network equipment can have the following implementation ways:

[0083] 1) Base station contains general cell and dedicated cell;

[0084] 2) Base station only contains dedicated cell.

[0085] Core Network Equipment: Core Network Equipment can be general core network equipment, which supports all types of UE, or dedicated core network equipment, which supports specific type of UE.

[0086] Figure 3 The method for selecting appropriate access network equipment for UE in the application. Figure 3 The method is shown in Figure 2 Under the architecture shown, according to type of UE, appropriate access network for UE is selected, including the following steps:

[0087] Step 301: Cell on base station broadcasts type of UE which the cell supports.

[0088] If cell on base station only supports certain type or several types of UE, the cell broadcasts type of UE which the cell supports in broadcast message. For example, cell only supports M-MTC user, and broadcast message contains supported type of UE M-MTC.

[0089] Step 302: UE selects access network, and initiates RRC establishment process. RRC establishment process includes UE sending RRC establishment request message to base station, base station allocating necessary resources, then sending RRC establishment message to UE, UE saving information, configuring resources, and then sending RRC establishment completion message to base station.

[0090] If the UE can identify the type of the cell supported broadcasted in step 301, when the UE in idle mode selects a cell to camp on, compare the UE's own type with the type of the UE supported by the cell, select the cell supporting the UE's own type as the cell to camp on, and initiate the RRC setup procedure. The UE's type can be further included in the RRC setup request message.

[0091] If the UE cannot identify the type of the cell supported broadcasted in step 301, the UE does not include the UE's type in the RRC setup request or RRC setup complete message when initiating the RRC setup, the base station can initiate the message in step 303, the base station finds the base stations around that can serve the UE, and initiates the X2 handover procedure to hand over the UE to the general base station. In the handover request message, the source base station can inform the destination base station of the UE's type. In order to determine whether the destination base station can serve the UE, the base stations need to exchange the type of the UE supported by the cells on the base stations. For example, in the process of X2 establishment, the type of the UE supported by the cells on the base stations is carried, through the process, the base station saves the type of the UE supported by the cells on the base stations around. If the source base station and the destination base station have no X2 connection, the S1 handover procedure is performed. The handover procedure is similar to the current S1 handover procedure, the difference is that the source base station can carry the UE's type in the message to inform the destination base station in the S1 handover procedure.

[0092] Corresponding to the method shown in the figure, the application provides a UE, comprising: a first receiving module and a first sending module, wherein: Figure 3

[0093] The first receiving module is used for receiving the type information of the cell supported broadcasted by the cells on the base station, and the type information of the cell supported comprises: the type of the UE supported by the cell;

[0094] The first sending module is used for sending the RRC setup request message according to the comparison of the type of the UE itself with the type of the UE supported by the cell.

[0095] Corresponding to the method shown in the figure, the application further provides a base station, comprising: a second sending device and a second receiving device, wherein: Figure 3

[0096] The second sending device is used for broadcasting the type information of the cell supported on the base station, and the type information of the cell supported comprises: the type of the UE supported by the cell;

[0097] The second receiving device is used for receiving the RRC setup request message sent by the UE.

[0098] ​​It should be noted that: the method of the application is described in the process of selecting the access network supporting the UE type according to the type of UE, in fact, the method of the application is also applicable to the cell according to the service type applied by the UE to judge, the dedicated cell supports a certain service type. Correspondingly, the UE type in the method of the application is replaced by the service type, so that the appropriate access network can be selected according to the service type applied by the UE. The following description process will not be described.

[0099] Figure 4 For the signaling flow diagram of the method of the application for notifying the base station of the type of UE carried by the UE, the base station judges whether the UE is allowed to access. The flow includes:

[0100] Step 401: the UE sends an RRC establishment request message. The message contains the identification of the UE, the reason of RRC establishment and other information.

[0101] The message can further contain the type of UE, for example, M-MTC type. Or indicate the type of UE or the type of service to be established in the reason of RRC establishment. For example, the reason of RRC establishment indicates that the type of UE is M-MTC type, or the reason of RRC establishment indicates that the type of service to be established is M-MTC type.

[0102] In step 401, the current RRC establishment request message can be used, and after the base station sends the response message RRC establishment to the UE, the type of UE is contained in the RRC establishment completion message sent by the UE to the base station.

[0103] Step 402: the eNB sends a redirection message to the UE.

[0104] The eNB judges whether the UE can provide the required service. If yes, the normal signaling flow is carried out, the normal message is sent to the UE, and step 402 is not carried out. If not supported, the eNB sends a redirection message to the UE, which contains the identification of the target eNB, or / and contains the cell unique identification of the target cell or the physical layer identification of the cell. In order to know whether the surrounding eNB supports a certain type of UE, the base stations need to interact with the type of UE supported by the cell on the base station. For example, in the process of X2 establishment, the type of UE supported by the cell on the base station is carried, through the process, the base station can save the type of UE supported by the cell on the surrounding base station.

[0105] The step 402 can also be carried out after the normal RRC establishment process is completed, and the RRC establishment completion message contains the measurement of the UE to the surrounding cell. According to the measurement result of the UE and the information of the cell on the surrounding base station saved by the base station, the base station can make a judgment.

[0106] Figure 5Signaling flow chart of another method for the base station to determine whether to allow the UE to access in the present application by the UE carrying the type of the UE to inform the base station. The flow chart comprises the following steps:

[0107] Step 501: The UE sends an RRC setup request message. The message contains the identity of the UE, the cause of the RRC setup and other information.

[0108] The message can further contain the type of the UE, for example, M-MTC type. Or the type of the UE is indicated in the cause of the RRC setup. For example, the cause of the RRC setup indicates that the type of the UE is M-MTC type, or the cause of the RRC setup indicates that the type of the service to be established is M-MTC type.

[0109] The current RRC setup request message can also be used in step 501, and after the base station sends a response message RRC setup to the UE, the type of the UE or the type of the service to be established is contained in the RRC setup complete message sent by the UE to the base station.

[0110] Step 502: The base station sends an RRC setup message to the UE.

[0111] Step 503: The UE sends an RRC setup complete message to the base station.

[0112] Step 504: The base station sends an initial UE message to the MME.

[0113] Step 505: The MME sends an initial context setup request message to the base station.

[0114] Step 506: The base station sends a corresponding RRC message to the UE to perform an RRC reconfiguration process.

[0115] Step 507: The base station sends an initial context setup response message to the MME.

[0116] The above steps are the same as the current RRC setup process and S1 signaling setup process.

[0117] Step 508: The source base station sends a handover request message to the destination base station.

[0118] The base station determines whether to provide services for the UE according to the type of the UE and the type supported by the base station. If the base station supports the type of the UE and can most effectively provide services for the UE, the normal flow is executed and step 508 is not executed; if the base station does not support the type of the UE, the base station determines whether there is a more suitable base station around to provide services for the UE. In order to make the determination, the base stations need to interact with each other on the types of UEs supported by the cells on the base stations. For example, in the process of X2 establishment, such as Figure 8As shown, the UE carries the type of UE supported by the cell on the base station through this process, through which the base station can acquire and save the type of UE supported by the cell on the surrounding base station. According to the UE measurement result and the information of the surrounding cell saved by the base station, the base station can make a judgment. If there is a more suitable base station around, the source base station sends a handover request message to the destination base station. The handover request message contains the information of the destination base station and the destination cell. The message can also carry the type of UE.

[0119] Step 509: the destination base station sends a handover response message to the source base station.

[0120] Step 510: the source base station sends a handover command to the UE.

[0121] Step 511: the UE synchronizes with the destination cell and sends a handover completion message to the destination base station.

[0122] Step 512: the destination base station sends a path switching request message to the core network.

[0123] Step 513: the core network sends a path switching response message to the destination base station, and the handover process is completed.

[0124] From step 508 to step 513, the X2 handover process is carried out, and if the source base station and the destination base station have no X2 connection, the S1 handover process is carried out. The handover process is similar to the current S1 handover process, and the difference is that the source base station can carry the type of UE in the message to inform the destination base station in the S1 handover process.

[0125] Corresponding to the method shown in Figure 4 and Figure 5 The present application provides a UE, comprising: a third sending module and a third receiving module, wherein:

[0126] The third sending module is configured to send an RRC establishment request message to a base station, wherein the RRC establishment request message contains type information, and the type information comprises: the type of UE.

[0127] The third receiving module is configured to receive an RRC establishment response message or a redirection message from the base station, wherein the redirection message contains the identity of a destination base station and / or the cell unique identity or physical layer identity of a target cell, and the destination base station or the target cell supports the type corresponding to the type information.

[0128] Corresponding to the method shown in Figure 4 and Figure 5 The present application provides a base station, comprising: a fourth receiving module and a fourth processing module, wherein:

[0129] The fourth receiving module is configured to receive an RRC establishment request message from the UE, wherein the RRC establishment request message contains type information, and the type information includes the type of the UE.

[0130] The fourth processing module is configured to redirect the UE to a target base station supporting the type corresponding to the type information or switch the UE to the target base station supporting the type when the base station does not support the type corresponding to the type information.

[0131] Figure 6 The signaling flow chart is a method for a core network to indicate the type of a UE to a base station and for the base station to determine whether to allow the UE to access.

[0132] Step 601: The UE establishes an RRC connection. The RRC establishment process includes that the UE sends an RRC establishment request message to the base station, the base station allocates necessary resources, then sends an RRC establishment message to the UE, the UE saves information, configures resources, and then sends an RRC establishment completion message to the base station.

[0133] Step 602: The base station sends an initial UE message to the core network.

[0134] Step 603: The core network learns from the subscription information of the UE that the UE is of a special type or the service of the UE is of a special type. The MME can obtain the subscription information of the UE from the HSS, and this process is an existing process. The subscription information indicates whether the UE is of a special type, and the special type can be M-MTC, C-MTC, or other types. The MME can be a general MME supporting all UE types or a special MME supporting only specific UE types or specific service types. Assuming that the core network is a general core network or a special core network and supports the type of the UE or the service type of the UE, the core network sends an initial context establishment request message containing the type of the UE (or an indication of the service type), for example, a message indicating that the type of the UE is M-MTC.

[0135] Step 604: The base station configures the UE. The base station sends an RRC reconfiguration request message to the UE, the UE configures the resources at the UE side according to the information in the reconfiguration message, and sends an RRC reconfiguration response message to the base station.

[0136] Step 605: The base station sends an initial context establishment response message to the MME.

[0137] Step 606: The source base station sends a handover request message to the target base station. The handover request message contains information of the target cell.

[0138] From step 604, the base station knows the type of the UE, and the base station judges whether the UE can be provided with services according to the type of the UE and the type supported by the base station. If the base station can establish a bearer for the type, provide services, or the base station is a general base station and does not distinguish different types and can most effectively provide services for the UE, the normal process is performed. If the base station does not support the type of the UE, the base station judges whether a more suitable base station around can provide services for the UE, and if a more suitable base station (i.e. a target base station) is found, the base station sends a message of step 606. In order to make the judgment, the base stations need to interact the types of UEs supported by the cells on the base stations. For example, in the process of X2 establishment, as shown in Figure 8 The base station can know and save the types of UEs supported by the cells on the surrounding base stations through the process. According to the UE measurement result and the information of the surrounding cells saved by the base station, the base station can make the judgment. If there is a more suitable base station around, the source base station sends a handover request message to the target base station. The handover request message contains the information of the target cell and can also contain the type of the UE.

[0139] Step 607: The target base station sends a handover response message to the source base station.

[0140] Step 608: The source base station sends a handover command to the UE.

[0141] Step 609: The UE synchronizes with the target cell and sends a handover complete message to the target base station.

[0142] Step 610: The target base station sends a path switch request message to the core network.

[0143] Step 611: The core network sends a path switch response message to the target base station, and the handover process is completed.

[0144] From step 606 to step 611, the X2 handover process is performed, and if the source base station and the target base station do not have X2 connection, the S1 handover process is performed. The handover process is similar to the current S1 handover process, and the difference is that the source base station can carry the type of the UE in the message to inform the target base station in the S1 handover process.

[0145] Corresponding to the method shown in Figure 6 The application provides a base station, comprising: a fifth receiving module and a fifth handover module, wherein:

[0146] The fifth receiving module is used for receiving type information of a UE from a core network device, and the type information comprises a type of the UE.

[0147] The fifth handover module is used for switching the UE to a target base station supporting the type when the base station does not support the type corresponding to the type information.

[0148] Corresponding to Figure 6 According to the method shown, the application provides a core network device, comprising a sixth receiving module and a sixth sending module, wherein:

[0149] The sixth receiving module is configured to receive an initial UE message from a base station.

[0150] The sixth sending module is configured to send type information of the UE to the base station, wherein the type information comprises a type of the UE.

[0151] Figure 7 The signaling flow chart is another method in which the core network indicates the type of the UE to the base station, and the base station judges whether to allow the UE to access.

[0152] Step 701: The UE establishes an RRC connection.

[0153] Step 702: The base station sends an initial UE message to the core network.

[0154] Step 703: The MME learns from the subscription information of the UE that the UE is of a special type, or the service of the UE is of a special type. The MME can obtain the subscription information of the UE from the HSS, and the process is an existing process. The subscription information indicates whether the UE is of a special type. The special type can be M-MTC, C-MTC, or other types. The MME can be a general MME supporting all UE types, or a special MME supporting only specific UE types or specific service types. If the MME is a special MME, the special MME does not support the type of the UE or the service type of the UE. The MME (i.e., the source MME) finds another MME (i.e., the destination MME) that supports the type of the UE, and the source MME sends a redirection message to the base station, wherein the message contains the type of the UE, for example, the message indicates that the type of the UE is M-MTC, and can also contain the identity MME code (MMEC) of the destination MME.

[0155] Alternatively, the message of step 703 only contains the MMEC of the destination MME, and does not contain the type of the UE, because the type of the UE is the subscription information, and the MME does not directly send the subscription information to the base station. Therefore, the base station needs to know the type of the UE or the type of the service through the pre-configured information, or the correspondence between the MMEC and the UE type or service type supported by the MMEC, and through the MMEC, the type of the UE or the type of the service is known.

[0156] Step 704: Following step 703, the base station learns the UE type. If the base station can establish a bearer for this type and provide services, or if the base station is a general-purpose base station that does not distinguish between different types, the base station finds the destination MME based on the MMEC included in step 703 and sends an initial UE message to the destination MME. The destination MME then becomes the UE's serving MME, assigns an identifier to the UE, and configures the base station to provide services to the UE. This process reuses the current signaling process and is omitted here.

[0157] From step 703, the base station learns the UE type. If the base station cannot establish a bearer and provide services for that type, or if it can provide services but is not the most suitable base station, the base station determines whether there is a more suitable base station nearby that can provide services to the UE. "More suitable" means checking if there is a dedicated base station designed for that type nearby. To make this determination, base stations need to exchange information about the UE types or service types supported by the cell on the base station. For example, during the X2 establishment process, such as... Figure 8 As shown, the base station carries the UE types supported by the cells on the base station. Through this process, the base station can learn and save the UE types supported by the cells on surrounding base stations. The base station learns the UE's measurement results of surrounding cells from the RRC establishment process or through the UE's measurement reporting process. Based on the UE's measurement results and the information of surrounding cells saved by the base station, the base station (i.e., the source base station) can make a judgment. If there is a more suitable base station nearby (i.e., the destination base station), the source base station initiates an S1 handover, switching the serving base station to the destination MME and the UE to the destination base station. The source base station sends a handover request message to the source MME, which includes the destination MME identifier MMEC and the identifier of the destination base station.

[0158] If the message in step 703 only contains the destination MMEC and not the UE type, the base station, based on pre-configured information, determines the correspondence between the MMEC and its supported UE types. Based on this information, combined with the aforementioned UE measurement results and the information of surrounding cells stored by the base station, the base station (i.e., the source base station) can make a judgment. If there is a more suitable base station nearby (i.e., the destination base station), the source base station initiates an S1 handover, switching the serving base station to the destination MME and the UE to the destination base station. The source base station sends a handover request message to the source MME, which includes the destination MME identifier (MMEC) and the identifier of the destination base station.

[0159] Step 705: The source MME sends a forwarding reset request to the destination MME. The message contains the identifier of the destination base station. Based on the destination MME identifier MMEC contained in step 704, the source MME forwards the message to the destination MME. The message contains the identifier of the destination base station.

[0160] Step 706: The destination MME sends a handover request to the destination base station. Based on the destination base station identifier contained in step 705, the destination MME locates the destination base station and sends a message to it.

[0161] Step 707: The destination base station sends a handover response to the destination MME. The destination base station saves the UE context information, allocates or reserves the necessary resources for the UE, and sends a response message to the destination MME.

[0162] Step 708: The destination MME sends a forward reset response message to the source MME.

[0163] Step 709: The source MME sends a handover command to the source base station.

[0164] Step 710: The source base station sends an RRC reconfiguration message to the UE.

[0165] Step 711: The UE synchronizes with the target cell and sends a handover completion message to the target base station.

[0166] Step 712: The destination base station sends a path handover notification message to the core network. The handover process is complete.

[0167] Corresponding to Figure 7 The method shown in this application provides a core network device, including: a seventh receiving module and an eighth redirection module, wherein:

[0168] The seventh receiving module is used to receive an initial UE message from the base station, the message containing the UE's identifier;

[0169] The eighth redirection module is used to find a target core network device that supports the type of the UE when the core network device does not support the type of the UE, and send the identifier of the target core network device and / or the type information of the UE to the base station through a redirection message.

[0170] Corresponding to Figure 7 The method shown in this application provides a base station, including: an eighth transmitting module and an eighth receiving module, wherein:

[0171] The eighth sending module is used to send an initial UE message to the core network equipment, the message containing the UE's identifier;

[0172] The eighth receiving module is configured to receive a redirection message from the core network device, the redirection message containing the identifier of the target core network device and / or the type information of the UE, wherein the target core network device supports the type of the UE.

[0173] Figure 8Is the present invention, the base station knows whether the surrounding base station supports the specific UE type flow chart. The flow includes:

[0174] Step 801: base station 2 sends X2 establishment request message to base station 1, the message carries the UE type or service type supported by the cell on base station 2, after receiving the message, base station 1 saves the UE type or service type supported by the cell on base station 2.

[0175] Step 802: base station 1 sends X2 establishment response message, the message carries the UE type or service type supported by the cell on base station 1, after receiving the message, base station 2 saves the UE type or service type supported by the cell on base station 1.

[0176] The above only for the preferred embodiment of the present application, and not to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the scope of the present application.

Claims

1. A method performed by a base station in a wireless communication system, the method comprising: transmitting, to a neighboring base station, a first message for an inter-base station interface setup procedure, the first message including first information related to at least one service type supported by the base station; receiving, from the neighboring base station, a second message for the inter-base station interface setup procedure, the second message including second information related to at least one service type supported by the neighboring base station; establishing a radio resource control (RRC) connection with a user equipment (UE); transmitting an initial UE message to an entity for managing mobility of the UE; receiving, from the entity, an initial UE context setup request message based on the initial UE message, the initial UE context setup request message including information related to a service type of the UE; and transmitting, to a target base station among the neighboring base stations, a handover request message for a handover of the UE, wherein the handover request message includes the information related to the service type of the UE, wherein the service type of the UE includes at least one of a first service type associated with a transmission delay and a second service type associated with intensive communication. 2.The method of claim 1, wherein the information related to the service type of the UE is determined based on subscription information for the UE. wherein 3.The method of claim 1 or 2, wherein the information related to the service type of the UE is determined based on the information related to the service type requested by the UE. wherein 4.The method of claim 1, wherein the handover of the UE is triggered based on mobility of the UE, and wherein wherein the at least one service type supported by the target base station is determined based on the second information. 5.A method performed by an entity for managing mobility of a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station, an initial UE message, the initial UE message including information of the UE; transmitting, to the base station, an initial UE context setup request message, the initial UE context setup request message including information related to a service type of the UE; receiving, from a target base station among neighboring base stations, a path switch request message based on a handover of the UE from the base station to the target base station, wherein a first message for an inter-base station interface setup procedure is transmitted by the base station to the neighboring base station, the first message including first information related to at least one service type supported by the base station, wherein a second message for the inter-base station interface setup procedure is transmitted by the neighboring base station to the base station, the second message including second information related to at least one service type supported by the neighboring base station, and wherein a handover request message for the handover of the UE is transmitted by the base station to the target base station among the neighboring base stations, the handover request message including the information related to the service type of the UE, wherein the service type of the UE includes at least one of a first service type associated with a transmission delay and a second service type associated with intensive communication. 6.The method of claim 5, further comprising: determining the information related to the service type of the UE based on subscription information of the UE. ​ 7. The method of claim 5 or 6, further comprising: determining the service type related information of the UE based on the service type related information requested by the UE.

8. The method of claim 5, wherein, the UE handover is triggered based on mobility of the UE, and wherein the at least one service type supported by the target base station is determined based on the second information.

9. A base station in a wireless communication system, the base station comprising: means for sending, to a neighboring base station, a first message for an inter-base station interface setup procedure, the first message comprising first information related to at least one service type supported by the base station; means for receiving, from the neighboring base station, a second message for the inter-base station interface setup procedure, the second message comprising second information related to at least one service type supported by the neighboring base station; means for establishing a radio resource control (RRC) connection with a user equipment (UE); means for sending, to an entity for managing mobility of the UE, an initial UE message; means for receiving, from the entity, an initial UE context setup request message based on the initial UE message, the initial UE context setup request message comprising service type related information of the UE; and means for sending, to a target base station in the neighboring base station, a handover request message for a UE handover, wherein the handover request message comprises the service type related information of the UE, wherein the service type of the UE comprises at least one of a first service type associated with transmission delay and a second service type associated with intensive communication.

10. The base station of claim 9, wherein the service type related information of the UE is determined based on subscription information of the UE.

11. The base station of claim 9 or 10, wherein the service type related information of the UE is determined based on service type related information requested by the UE.

12. The base station of claim 9, wherein the UE handover is triggered based on mobility of the UE, and wherein the at least one service type supported by the target base station is determined based on the second information.

13. An entity for managing mobility of a user equipment (UE) in a wireless communication system, the entity comprising: means for receiving, from a base station, an initial UE message, the initial UE message comprising information of the UE; means for sending, to the base station, an initial UE context setup request message, the initial UE context setup request message comprising service type related information of the UE; means for receiving, from a target base station in a neighboring base station, a path switch request message based on a UE handover from the base station to the target base station in the neighboring base station, wherein a first message for an inter-base station interface setup procedure is sent by the base station to the neighboring base station, the first message comprising first information related to at least one service type supported by the base station, wherein a second message for the inter-base station interface setup procedure is sent by the neighboring base station to the base station, the second message comprising second information related to at least one service type supported by the neighboring base station, and wherein the service type related information of the UE is determined based on the second information. wherein the handover request message for UE handover is sent by the base station to a target base station among the neighboring base stations, the handover request message including UE's service type related information, wherein the UE's service type includes at least one of a first service type associated with transmission delay and a second service type associated with intensive communication.

14. The entity of claim 13, further comprising: a module configured to determine the UE's service type related information based on the UE's subscription information.

15. The entity of claim 13 or 14, further comprising: a module configured to determine the UE's service type related information based on the UE requested service type related information.

16. The entity of claim 13, wherein, the UE handover is triggered based on the UE's mobility, and wherein the at least one service type supported by the target base station is determined based on the second information.

17. A base station, the base station comprising: a transceiver; and a processor coupled to the transceiver and configured to perform the method of any one of claims 1-4.

18. An entity managing mobility of a user equipment (UE), the entity comprising: a transceiver; and a processor coupled to the transceiver and configured to perform the method of any one of claims 5-8.

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