WO2010130088A1

WO2010130088A1 - Method and apparatus of network selection

Info

Publication number: WO2010130088A1
Application number: PCT/CN2009/071765
Authority: WO
Inventors: 姜怡; 焦斌; 权威; 张戬
Original assignee: 华为技术有限公司
Priority date: 2009-05-12
Filing date: 2009-05-12
Publication date: 2010-11-18
Also published as: CN102369757B; CN102369757A

Abstract

A method and an apparatus of network selection are provided, and they relate to the field of wireless communication. The method comprises: receiving network selection information sent by user equipment (UE) through a subordinate cell that can support emergency service; after detecting that access reason of said UE is emergency, selecting a Public Land Mobile Network (PLMN) that can support the emergency service for said UE to perform the connection according to the network selection information and the capability information of the PLMN connected with the subordinate cell for supporting the emergency service.

Description

The present invention relates to the field of wireless communications, and in particular, to a method and apparatus for network selection. Background technique

LTE (Long Term Evolved) is a mobile communication network actively researched by various vendors in the 3GPP (3rd Generation Partnership Project) organization. It is a Universal Mobile Telecommunication System (UMTS). System) evolution network.

In LTE, two types of emergency calls can be supported, one is PS (Packet Switch) emergency call; the other is CS (Circuit Switch) emergency call. The PS emergency call is implemented by means of IMS (IP Multimedia Subsystem), and the CS emergency call is implemented by CSFB (CS Fallback). In the prior art, when the UE performs the emergency service access, the selected service cannot support the emergency service, and the emergency service access fails, or the network selection and access need to be re-established, and the emergency service is reduced. Speed. Summary of the invention

Embodiments of the present invention provide a method and apparatus for network selection, so that the speed at which the UE performs emergency service access is effectively improved.

The method for network selection provided by the embodiment of the present invention includes: receiving network selection information sent by a user equipment by a subordinate cell capable of supporting an emergency service; after detecting that the access reason of the user equipment is an emergency, according to The network selection information and the support capability information of the public land mobile network PLMN connected to the subordinate cell to the emergency service are selected for the user equipment to select a PLMN capable of supporting the emergency service.

Another method for network selection provided by the embodiment of the present invention includes: acquiring an And the subordinate cell capable of supporting the emergency service to perform emergency service access according to the support capability information.

The embodiment of the present invention further provides a base station, including: a receiving unit: configured to receive network selection information sent by a user equipment by a subordinate cell capable of supporting emergency services; and a network selecting unit: configured to detect the connection of the user equipment After the reason is urgent, according to the network selection information and the support capability information of the PLMN for the emergency service connected by the subordinate cell, the PLMN that can support the emergency service is selected for the user equipment to connect.

An embodiment of the present invention provides a user equipment, including: an acquiring unit: configured to acquire information about support capability of a subordinate cell to an emergency service sent by a base station; and a cell selection unit: configured to use the capability information of the subordinate cell to support the emergency service Selecting the subordinate cell capable of supporting the emergency service for emergency service access.

The method and device for network selection provided by the embodiment of the present invention can refer to the support capability of the subordinate cell of the base station to the emergency service, so that the UE can quickly access the network supporting the emergency service when initiating the emergency service. FIG. 1B is a flowchart of a user equipment side of a method for network selection according to an embodiment of the present invention; FIG. A flow chart of a method for selecting a network in an emergency call scenario provided by an embodiment of the present invention;

FIG. 3 is a flowchart of a method for selecting a network according to an embodiment of the present invention, in an emergency call, and in a scenario in which only a part of MMEs in the PLMN can support emergency registration;

FIG. 4 is a flowchart of a method for selecting a network in a scenario in which only a part of MMEs can support emergency registration in a PLMN according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. In the process of implementing the embodiments of the present invention, the inventor finds that the base station can use the emergency service support capability indication to indicate to the UE (User Equipment) whether the subordinate cells of the base station support the PS emergency call. For example, the emergency service support capability indication may be notified to the UE through a NAS (Non-Access Stratum) message, that is, an Attach process or a TAU (Tracking Area Update) process, but may occur. The following questions:

On the one hand, for a normal mode UE, if the registered network does not support the emergency call, when the UE initiates an emergency call, when the PLMN (Public Land Mobile Network) and the cell are reselected, it is impossible to know which networks in time. It is supported by emergency calls. It can only be learned by attaching again. If the reselected network still does not support, the UE needs to continue to reselect and extend the establishment time of the emergency call;

On the other hand, for a UE in a restricted mode, for example, if there is no USIM (Universal Subscriber Identity Module) card, authentication fails, the Attach process cannot be successfully performed, and thus it is impossible to know whether the network supports emergency. Calls, only when the emergency call process is actually initiated, can access the network through the Emergency Attach process. If the network does not support emergency calls, the request will be rejected, which also slows down the speed of emergency call setup. In addition, not all PLMNs support the emergency registration process of restricted mode UEs. Therefore, when the UE in the restricted mode initiates the emergency registration, if it can know in advance whether the accessed network supports the emergency registration, it can be avoided that the accessed network does not support the capability and is rejected. , increase the unnecessary delay.

In order to effectively solve the problems in the prior art, the inventors propose a method and apparatus for network selection. The method and apparatus for network selection according to the embodiment of the present invention are described in detail below with reference to the accompanying drawings.

As shown in FIG. 1C, a method for network selection according to an embodiment of the present invention, where the main process of the base station side includes:

SlOla: receiving network selection information sent by the user equipment through a subordinate cell capable of supporting emergency services; The foregoing network selection information may include: a PLMN selected by the user equipment, an access reason is urgent, and may include information such as whether the user type is a restricted mode or a normal mode, and an MME previously registered by the user equipment.

S102a: After detecting that the access reason of the user equipment is urgent, selecting, according to the network selection information and the support capability information of the public land mobile network PLMN connected to the subordinate cell to the emergency service, selecting, for the user equipment, the emergency service. The PLMN is connected.

The process of selecting a PLMN may include: if it is determined that the user equipment is in the restricted mode according to the network selection information, selecting a PLMN capable of supporting emergency registration to perform a connection; and/or, if the emergency service is an emergency call, selecting to support The PLMN of the emergency call is connected. Therefore, the UE in the restricted mode can directly support the emergency registered PLMN to connect, which improves the speed and success rate of the emergency access.

Before the step, the method further includes: obtaining, by the S1 interface message, the PLMN support information about the emergency service supported by the subordinate cell from the mobility management entity MME.

The above PLMN support capability information for emergency services includes: support capability information for emergency calls; and/or support capability information for emergency registration.

In this embodiment, the PLMN that can support the emergency service is selected by the network side for the user equipment to connect, thereby improving the speed and success rate of the UE for emergency access.

As another embodiment of the present invention, before the step 101a, the method further includes: setting, according to the support capability information of the emergency service of the PLMN connected to the subordinate cell, the support capability information of the subordinate cell to the emergency service; and the subordinate cell to the emergency service The support capability information is sent to the user equipment, so that the user equipment selects a subordinate cell capable of supporting the emergency service to perform emergency service access according to the support capability information of the subordinate cell to the emergency service.

The method for transmitting the support capability information of the subordinate cell to the user equipment of the emergency service may be: sending the support capability information of the subordinate cell to the emergency service to the user equipment by using the system broadcast message in the subordinate cell.

The information about the support capability of the subordinate cell to the emergency service may include: emergency service support capability The indication, and/or the emergency registration support capability indication; wherein, the emergency service support capability indication is used to indicate whether the subordinate cell supports the emergency call; and the emergency registration support capability indication is used to indicate whether the subordinate cell supports the emergency registration.

In this embodiment, the information about the support capability of the subordinate cell to the emergency service is sent to the UE, so that the UE can be used as a reference in the process of selecting the cell, thereby ensuring that the UE can quickly access the network supporting the emergency service when initiating the emergency service.

As shown in FIG. 1B, the main process of the user side in the network selection method provided by the embodiment of the present invention includes:

SlOlb: acquiring information about the support capability of the subordinate cell sent by the base station to the emergency service;

The foregoing emergency capability support capability information includes: an emergency service support capability indication, and/or an emergency registration support capability indication; wherein, the emergency service support capability indication is used to indicate whether the subordinate cell supports the emergency call; and the emergency registration support capability indication is used to indicate Whether the subordinate community supports emergency registration.

S102b: Select, according to the support capability information of the subordinate cell to the emergency service, the subordinate cell capable of supporting the emergency service to perform emergency service access.

In the access process, the method further includes: in the subordinate cell, the user type is notified to the base station by using the network selection information, so that the base station selects the PLMN capable of supporting the emergency registration after detecting that the access reason is urgent. Make a connection.

In this embodiment, the UE supports the ability of the subordinate cell to support the emergency service, and the UE is used as a reference in the process of selecting the cell, thereby ensuring that the UE can quickly access the network supporting the emergency service when initiating the emergency service.

As shown in FIG. 2, a flowchart of a method for selecting a network according to an embodiment of the present invention in a scenario in which an emergency service is an emergency call includes:

S201: The eNB broadcasts, in a system broadcast message, whether its subordinate cell supports an emergency call.

Before the step, the eNB can acquire and store the supported capability of the connected network for the emergency call. The method for obtaining the eNB can be: the eNB obtains the MME (Mobility Management Entity, mobile management entity) through the added or original S1 interface message. The foregoing S1 interface message can be: SI SETUP RESPONSE, or MME CONFIGURATION UPDATE.

In the step S201, the eNB may notify the UE whether the subordinate cell supports the emergency call by broadcasting the emergency service support capability indication in the system broadcast message of the subordinate cell, and there are multiple methods for setting the emergency service support capability indication. Setting according to different policies, for example, the setting method may be: if at least one of the PLMNs connected to the subordinate cell supports an emergency call, the emergency service support capability indication is supported; when all PLMNs connected to the subordinate cell No emergency call is supported, and the emergency service support capability indication is not supported. The method for setting the emergency service support capability indication may be: if the MME in the PLMN connected to the subordinate cell supports at least one emergency call, the PLMN is considered to support the emergency call, as long as at least one of the PLMNs connected to the subordinate cell is If an emergency call is supported, the emergency service support capability indication is supported; when all the PLMNs connected to the subordinate cell do not support the emergency call, the emergency service support capability indication is not supported.

As still another embodiment of the present invention, the emergency service support capability indication can also be used to indicate the subordinate cell-to-PS emergency call and the ability to support CS emergency calls, i.e., CSFB capabilities. The network that does not support the PS emergency call can access the emergency call of the UE, and assists the UE to fall back to the 2G/3G network for emergency call in the circuit domain by means of CSFB.

S202: The UE receives and reads the cell system broadcast message, learns the support capability of the subordinate cell for the emergency call, and selects a cell capable of supporting the emergency call to perform service access according to the support capability.

S203: The UE initiates an emergency call in the selected cell supporting the emergency call. In the RRC (Radio Resource Control) connection establishment process, the eNB 4 reports that the access reason is urgent, and reports the PLMN selected by the UE itself;

Optionally, the UE may also report the previously registered MME to the eNB.

S204: The eNB detects that the access reason of the UE is urgent, and selects a PLMN that can support the service for the UE to connect. In the process of selecting the PLMN to perform the connection, the eNB may select the PLMN to connect to the UE according to the support capability of the connected PLMN for the emergency call and the PLMN selected by the UE, which may include: if the PLMN selected by the UE supports In the emergency call, the eNB selects the PLMN, otherwise, the eNB randomly selects a PLMN for the UE in the PLMN supporting the emergency call;

If the UE also reports the previously registered MME, in the process of selecting the PLMN to perform the connection, the eNB may also connect the MME that is registered by the UE to select a suitable PLMN for the UE to connect, which may include: If the PLMN selected by the UE supports the emergency call, the eNB selects the PLMN; otherwise, the eNB may select a PLMN supporting the emergency call for the UE by referring to the MME registered by the UE: ie, if the eNB obtains the MME registered by the UE and the PLMN to which the MME belongs The emergency call is supported, and the eNB selects the PLMN. Otherwise, the eNB randomly selects a PLMN for the UE in the PLMN supporting the emergency call.

Thereafter, the MME is selected in the selected PLMN for the UE to support the emergency call to establish a connection.

S205: The UE successfully establishes an emergency call.

In this embodiment, on the one hand, the base station broadcasts a message in the system broadcast message whether the subordinate cell supports the emergency call, so that the UE can refer to the indication when performing PLMN selection and cell selection, thereby ensuring that the UE is initiating an emergency call. In this case, the network can be quickly connected to the emergency call. On the other hand, by referring to the support capabilities of each PLMN for emergency calls, the user equipment can directly select the PLMN that can support the emergency call, thereby improving the UE's emergency call. Access speed and success rate.

As a further embodiment of the present invention, the above steps S201-S202; or S203-S204 may also be replaced by the flow in the prior art, that is, the method provided in the above steps S201-S202 may be selected to optimize the prior art. The selection process of the user equipment to the cell, or only the method provided in the above steps S203-S204 is used to optimize the selection process of the PLMN by the network side in the prior art. It is also possible to achieve a certain effect of improving the access success rate of the UE for emergency calls.

As shown in FIG. 3, a method for network selection according to an embodiment of the present invention is in an emergency service. An emergency call, and a flowchart of an application in a scenario in which only a part of the MMEs in the PLMN can support emergency registration, including:

S301: The eNB broadcasts, in a system broadcast message, whether its subordinate cell supports emergency call and emergency registration.

Before the step, the eNB may acquire and store the supported capability of the connected network for emergency call and emergency registration; the method may be obtained by the eNB from the MME through the newly added or original S1 interface message (Mobility Management Entity, mobile management entity) Obtained, the above-mentioned original S1 interface message may be: SI SETUP RESPONSE (SI establishment response), or MME CONFIGURATION UPDATE (mobile management entity configuration update) and other messages.

In step S301, the eNB may notify the UE whether the subordinate cell supports the emergency call by broadcasting the emergency service support capability indication in the system broadcast message of the subordinate cell, and there are multiple methods for setting the emergency service support capability indication. Setting according to different policies, for example, the setting method may be: if at least one of the PLMNs connected to the subordinate cell supports an emergency call, the emergency service support capability indication is supported; when all PLMNs connected to the subordinate cell No emergency call is supported, and the emergency service support capability indication is not supported. The method for setting the emergency service support capability indication may be: if the MME in the PLMN connected to the subordinate cell supports at least one emergency call, the PLMN is considered to support the emergency call, as long as at least one of the PLMNs connected to the subordinate cell is If an emergency call is supported, the emergency service support capability indication is supported; when all the PLMNs connected to the subordinate cell do not support the emergency call, the emergency service support capability indication is not supported.

As still another embodiment of the present invention, the emergency service support capability indication may be used to indicate that the subordinate cell supports the PS emergency call and the CS emergency call, i.e., CSFB capability. The network that does not support the PS emergency call can access the emergency call of the UE, and assists the UE to return to the 2G/3G network for emergency call in the circuit domain by means of CSFB.

And the eNB may notify the UE whether the subordinate cell supports emergency registration by broadcasting the emergency registration support capability indication in the system broadcast message of the subordinate cell, and set the emergency registration branch. The method of the capability indication may be: if at least one of the PLMNs supported by the eNB supports emergency registration, the indication is supported; when all PLMNs supported by the eNB do not support emergency registration, the indication is not supported. . The method for setting the emergency registration support capability indication may be: as long as at least one MME in the PLMN connected to the subordinate cell supports emergency registration, the PLMN is considered to support emergency registration, as long as at least one PLMN connected to the subordinate cell If an emergency registration is supported, the emergency registration support capability indication is supported; when all the PLMNs connected to the subordinate cell do not support emergency registration, the emergency registration support capability indication is not supported.

As another embodiment of the present invention, the emergency registration support capability indication involved in the foregoing method embodiments may be extended, and the indication may indicate whether the UE entering the restricted state may perform emergency registration for different reasons, respectively, accordingly, A UE entering a restricted state for different reasons may perform cell selection with reference to a corresponding capability indication. The above reasons may include: No USIM card, authentication failed, USIM card invalid.

S302: The UE receives and reads the cell system broadcast message, and learns the support capability of the subordinate cell for the emergency call and the emergency registration, and selects a cell to perform service access according to the foregoing support capability.

The method for specifically selecting a cell may include: if the UE is in a normal mode, selecting a cell capable of supporting an emergency call; if the UE is in a restricted mode, selecting a cell that supports both an emergency call and an emergency registration.

S303: The UE initiates an emergency call in the selected cell. In the RRC (Radio Resource Control) connection establishment process, the access reason is reported to the eNB as emergency.

In this process, the UE may inform the eNB whether it is in the restricted mode, for example: if the UE is in the restricted mode, the UE carries the random number in the RRC connection setup message; otherwise, the UE is in the RRC connection setup message. The S-TMSI (S-Temporary Mobile Subscriber Identity) assigned by the registered MME is carried. In addition, the UE will report the PLMN of its choice to the eNB. Optionally, the UE may also report the previously registered MME to the eNB 4.

Alternatively, the method that the UE can inform the eNB whether it is in the restricted mode may also be: the UE is connected. During the establishment process, whether the state of the UE is in the restricted mode or the normal mode by carrying the PLMN selected by itself, that is, if the UE is in the restricted mode, the UE does not carry the PLMN selected by itself during the RRC connection establishment process; otherwise, If the UE is in the normal mode, the UE carries the PLMN selected by itself in the RRC connection establishment process. Optionally, the UE may also report the previously registered MME to the eNB.

Or, the method that the UE can inform the eNB whether it is in the restricted mode or not: the UE indicates whether the state of the UE is the restricted mode or the normal mode by carrying the previously registered MME in the connection establishment process, that is, if the UE is In the restricted mode, the UE carries the previously registered MME in the RRC connection establishment process; otherwise, if the UE is in the normal mode, the UE does not carry the previously registered MME in the RRC connection establishment process.

By analogy, the UE may also inform the eNB whether it is in the restricted mode by other means, and details are not described herein again.

S304: The eNB detects that the access reason of the UE is urgent, determines whether the connection establishment request is initiated by the restricted mode UE, and selects a PLMN that can support the service to connect.

Corresponding to the different methods in the S303 for the UE to notify whether the mode is the restricted mode, the method for the eNB to determine whether the connection establishment request is a restricted mode UE is different, and may include:

If the UE identifier in the RRC connection setup message is a random number, the UE is considered to be in the restricted mode; otherwise, if the UE identifier is S-TMSI, the UE is considered to be in the normal mode. Or, if the UE does not carry the selected PLMN, the UE is considered to be in the restricted mode; otherwise, if the UE carries the selected PLMN, the UE is in the normal mode. Or, if the UE carries the previously registered MME, the UE is considered to be in the restricted mode; otherwise, if the UE does not carry the previously registered MME, the UE is in the normal mode.

The method for the eNB to select the PLMN for the normal mode UE may include: the eNB selects the PLMN to connect to the UE according to the supported capability of the connected PLMN to the emergency call, and the PLMN selected by the UE, and may include: The PLMN supports the emergency call, and the eNB selects the PLMN. Otherwise, the eNB randomly selects the UE in the PLMN supporting the emergency call. Select a PLMN;

In addition, if the UE also reports the previously registered MME in the step S303, the eNB may also select the appropriate PLMN for the UE to connect to the UE in the process of selecting the PLMN to perform the connection. Specifically, the eNB may select the PLMN if the PLMN selected by the UE supports the emergency call; otherwise, the eNB may select a PLMN supporting the emergency call for the UE by referring to the MME registered by the UE: that is, if the eNB obtains the MME registered by the UE and The PLMN to which the MME belongs supports the emergency call, and the eNB selects the PLMN. Otherwise, the eNB randomly selects a PLMN for the UE in the PLMN supporting the emergency call.

Thereafter, the MME is selected in the selected PLMN for the UE to support the emergency call to establish a connection. The method for the eNB to select the PLMN for the restricted mode UE may include: the eNB selects the PLMN to connect to the UE according to the supported PLMN for the emergency call and the emergency registration, and the PLMN selected by the UE, which may include: If the PLMN selected by the UE supports both the emergency call and the emergency registration, the eNB selects the PLMN. Otherwise, the eNB randomly selects a PLMN for the UE in the PLMN that supports both the emergency call and the emergency registration.

In addition, if the UE also reports the previously registered MME in the step S303, the eNB may also select the appropriate PLMN for the UE to connect to the UE in the process of selecting the PLMN to perform the connection. Specifically, the eNB may select the PLMN if the PLMN selected by the UE supports both the emergency call and the emergency registration; otherwise, the eNB may select a PLMN that supports both the emergency call and the emergency registration for the UE by referring to the MME registered by the UE: If the eNB obtains the MME registered by the UE and the PLMN to which the MME belongs supports both the emergency call and the emergency registration, the eNB selects the PLMN. Otherwise, the eNB randomly selects one for the UE in the PLMN that supports both the emergency call and the emergency registration. PLMN.

Thereafter, the MME is selected in the selected PLMN to establish a connection for the UE that can support both the emergency call and the emergency registration.

S305: The UE successfully establishes an emergency call.

In this embodiment, on the one hand, the subordinate cell can be broadcasted by the base station in the system broadcast message. Whether the emergency call and the emergency registration are supported, so that the UE in the restricted mode can refer to the emergency call capability and the emergency registration capability at the same time to perform the PLMN and the cell selection, thereby increasing the success rate of establishing the emergency service and speeding up the activation. The establishment process of the emergency service; on the other hand, by referring to the support capabilities of each PLMN for emergency call and emergency registration, the user equipment can directly select the PLMN capable of supporting the emergency call and the emergency registration to connect, thereby improving the emergency call of the UE. Access speed and success rate.

As a further embodiment of the present invention, the foregoing steps S301-S302; or S303-S304 may also be replaced by the flow in the prior art, that is, the method provided in the above steps S301-S302 may be selected to optimize the prior art. The selection process of the user equipment to the cell, or only the method provided in the above steps S303-S304 is used to optimize the selection process of the PLMN by the network side in the prior art. It is also possible to achieve a certain effect of improving the access success rate of the UE for emergency calls.

As shown in FIG. 4, a flowchart of a network selection method provided by an embodiment of the present invention in a scenario in which only a part of MMEs can support emergency registration in a PLMN includes:

S401: The eNB broadcasts, in a system broadcast message, whether its subordinate cell supports emergency registration.

Before the step, the eNB may acquire and store the supported capability of the connected network for the emergency registration. The method may be obtained by the eNB from the MME (Mobility Management Entity) through the added or original S1 interface message. The above-mentioned original S 1 interface message may be: SI SETUP RESPONSE (SI establishment response), or MME CONFIGURATION UPDATE (mobile management entity configuration update) and other messages.

In step S401, the eNB may notify the UE whether the subordinate cell supports the emergency registration by broadcasting the emergency registration support capability indication in the system broadcast message of the subordinate cell, and there are various methods for setting the emergency registration support capability indication. The setting may be performed according to different policies. For example, the setting method may be: if at least one of the PLMNs supported by the eNB supports emergency registration, the indication is supported; when all PLMNs supported by the eNB do not support emergency registration, Set this indication to not supported. The specific determining method for setting the emergency registration support capability indication may be: as long as at least one MME in the PLMN connected to the subordinate cell supports emergency registration, The PLMN supports emergency registration, and as long as at least one of the PLMNs connected to the subordinate cell supports emergency registration, the emergency registration support capability indication is supported; when all PLMNs connected to the subordinate cell do not support emergency registration, The emergency registration support capability indication is not supported.

S402: The UE receives and reads the cell system broadcast message, learns the support capability of the subordinate cell for emergency registration, and selects a cell supporting emergency registration to perform service access according to the foregoing support capability.

S403: The UE initiates an emergency service in the selected cell. In the RRC (Radio Resource Control) connection establishment process, the access reason is reported to the eNB as emergency.

In this process, the UE may inform the eNB whether it is in the restricted mode in different manners. For details, refer to the method in step S303 in the corresponding embodiment of FIG. 3, and details are not described herein again.

S404: The eNB detects that the access reason of the UE is urgent, determines whether the connection establishment request is initiated by the restricted mode UE, and selects a PLMN that can support the service for the UE to connect.

The method for determining whether the connection establishment request is a restricted mode UE is different according to the method for the UE to notify whether the UE is in the restricted mode in S403. For details, refer to the method in step S304 in the corresponding embodiment of FIG. 3, This will not be repeated here.

The PLMN selection method of the eNB to the normal mode UE may be: the eNB selects the PLMN reported by the UE as the PLMN for the emergency service access; and then selects an MME for the UE to establish a connection in the selected PLMN.

The method for the eNB to select the PLMN for the restricted mode UE may include: the eNB selects the PLMN to connect to the UE according to the supported PLMN and the PLMN selected by the UE, and may include: The PLMN supports emergency registration, and the eNB selects the PLMN. Otherwise, the eNB randomly requests the UE in the PLMN supporting emergency registration. Select a PLMN;

In addition, if the UE also reports the previously registered MME, in step S403, in the process of selecting the PLMN to perform the connection, the eNB may also select the appropriate PLMN for the UE to connect with the MME registered by the UE. Specifically, the eNB may select the PLMN if the PLMN selected by the UE supports the emergency registration; otherwise, the eNB may select a PLMN that supports the emergency registration for the UE by referring to the MME registered by the UE: that is, if the eNB obtains the MME registered by the UE and The PLMN to which the MME belongs supports emergency registration, and the eNB selects the PLMN. Otherwise, the eNB randomly selects a PLMN for the UE in the PLMN that supports emergency registration.

Thereafter, the MME is selected in the selected PLMN for the UE to support the emergency registration to establish a connection.

S405: The UE successfully establishes an emergency service.

In this embodiment, on the one hand, the base station can broadcast in the system broadcast message whether the subordinate cell can support the emergency registration, so that the UE in the restricted mode can refer to the emergency registration capability to perform the PLMN and the cell selection when performing the emergency service. . Therefore, the establishment success rate of the emergency service is increased, and the establishment process of the emergency service is accelerated. On the other hand, by referring to the support capability of each PLMN for emergency registration, the user equipment can directly select the PLMN capable of supporting the emergency registration, thereby The access speed and success rate of the emergency service of the UE are improved.

As a further embodiment of the present invention, the foregoing steps S401-S402; or S403-S404 may also be replaced by the flow in the prior art, that is, the method provided in the above steps S401-S402 may be selected to optimize the prior art. The selection process of the cell by the user equipment, or only the method provided in the above steps S403-S404 is used to optimize the selection process of the PLMN by the network side in the prior art. It is also possible to achieve a certain effect of improving the access success rate of the UE for emergency calls.

As shown in FIG. 5, it is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station can be used to implement the functions of the base station in the foregoing method embodiment, including:

The receiving unit 504 is configured to receive network selection information sent by the user equipment by using a subordinate cell capable of supporting emergency services.

The network selection unit 505 is configured to: after detecting that the access reason of the user equipment is an emergency, according to the network The network selection information and the PLMN support capability information of the PLMN connected to the subordinate cell are selected for the user equipment to select the PLMN capable of supporting the emergency service.

The base station can further include:

The obtaining unit 501 is configured to obtain information about the support capability of the network connected to the base station for emergency services. As another embodiment of the present invention, the base station may further include:

The indication setting unit 502 is configured to set the support capability information of the subordinate cell to the emergency service according to the support capability information of the network connected to the base station that is acquired by the obtaining unit 501;

The sending unit 503 is configured to send the support capability information of the subordinate cell to the emergency service to the user equipment, so that the user equipment selects the subordinate cell capable of supporting the emergency service to perform emergency service access according to the supporting capability information of the subordinate cell to the emergency service. .

The support capability information may include: an emergency service support capability indication, and/or an emergency registration support capability indication; wherein, the emergency service support capability indication is used to indicate whether the subordinate cell supports the emergency call; and the emergency registration support capability indication is used to indicate whether the subordinate cell is Support for emergency registration.

As shown in FIG. 6, the user equipment is provided by the embodiment of the present invention, and the user equipment can be used to implement the functions of the user equipment in the foregoing method embodiment, including:

The obtaining unit 601 is configured to obtain the support capability information of the subordinate cell to the emergency service sent by the base station, where the support capability information may include: an emergency service support capability indication, and/or an emergency registration support capability indication; wherein, the emergency service support capability The indication is used to indicate whether the subordinate cell supports the emergency call; the emergency registration support capability indication is used to indicate whether the subordinate cell supports the emergency registration.

The cell selection unit 602 is configured to select, according to the foregoing support capability information, a subordinate cell capable of supporting the emergency service to perform emergency service access.

As another embodiment of the present invention, the user equipment may further include:

The user equipment type notification unit 603 is configured to notify the base station that the user type of the user equipment is a restricted mode by using the network selection information in the subordinate cell, so that the base station is the user after detecting that the access reason of the user equipment is urgent. The device selects a PLMN that can support emergency registration to connect.

It should be noted that in the above device embodiment, each unit included is only functionally logically The division is performed, but is not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific names of the respective functional units are only for the purpose of facilitating mutual differentiation, and are not intended to limit the scope of protection of the present invention.

In the foregoing method and apparatus embodiment of the present invention, the eNB broadcasts the cell's ability to support the emergency service in the system broadcast message, so that the UE serves as a reference in the process of selecting the cell, thereby ensuring that the UE can quickly access the emergency when the emergency service is initiated. Business network. At the same time, in the cell system broadcast message, only the ability of the cell to support the emergency service is broadcasted, that is, the indication of the support capability of all the PLMNs supported by the subordinate cell to the emergency service is integrated, instead of broadcasting all the PLMNs supported by the subordinate cell separately. Supporting the emergency service, the system broadcast overhead is saved; and the eNB combines the reporting parameters of the UE and the support capabilities of each PLMN for the emergency service to select a suitable network connection for the UE, and avoids the UE only passing the broadcast message. The support capability cannot correctly select the appropriate PLMN and cause delays caused by unnecessary signaling overhead, which speeds up the establishment process of the emergency service.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or by software plus necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope of the present invention is All should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

A method for network selection, characterized in that it comprises:

Receiving network selection information sent by the user equipment by the subordinate cell capable of supporting the emergency service; after detecting that the access reason of the user equipment is urgent, according to the network selection information and the public land mobile network PLMN connected by the subordinate cell The support capability information for the emergency service is selected for the user equipment to select a PLMN capable of supporting the emergency service.

2. The method according to claim 1, wherein before the selecting, by the user equipment, a PLMN capable of supporting the emergency service, the method further comprises:

The PLMN support capability information of the PLMN connected to the subordinate cell is obtained from the mobility management entity MME through the S1 interface message.

The method according to claim 1, wherein the PLMN support capability information for the emergency service includes: support capability information for the emergency call; and/or support capability information for the emergency registration.

The method according to any one of claims 1 to 3, wherein the receiving user equipment transmits network selection information through a subordinate cell capable of supporting emergency services, and the method further includes:

And setting, according to the support capability information of the PLMN connected to the subordinate cell to the emergency service, the support capability information of the subordinate cell to the emergency service;

Sending, to the user equipment, information about the support capability of the subordinate cell to the emergency service, so that the user equipment selects the subordinate cell capable of supporting the emergency service according to the support capability information of the subordinate cell to the emergency service. Emergency service access.

5. The method of claim 4 wherein:

The information about the support capability of the subordinate cell to the emergency service includes: an emergency service support capability indication, and/or an emergency registration support capability indication;

The emergency service support capability indication is used to indicate whether the subordinate cell supports an emergency call; and the emergency registration support capability indication is used to indicate whether the subordinate cell supports emergency registration.

The method according to claim 5, wherein the setting the support capability information of the subordinate cell to the emergency service according to the support capability information of the PLMN for the emergency service includes: When at least one of the PLMNs connected to the subordinate cell supports an emergency call, the emergency service support capability indication is supported, otherwise, all connected PLMNs connected to the subordinate cell do not support the emergency call. When the emergency service support capability indication is not supported;

Or, when at least one MME in the PLMN connected to the subordinate cell supports an emergency call, the PLMN is considered to support an emergency call; otherwise, when at least one of the PLMNs connected to the subordinate cell supports an emergency call, The emergency service support capability indication is set to be supported. Otherwise, when the PLMN connected to the subordinate cell does not support the emergency call, the emergency service support capability indication is not supported.

The method according to claim 5, wherein the setting of the support capability information of the subordinate cell to the emergency service according to the support capability information of the PLMN for the emergency service, specifically includes: when the subordinate cell is connected When at least one of the PLMNs supports emergency registration, the emergency registration support capability indication is supported. Otherwise, when all the connected PLMNs connected to the subordinate cells do not support emergency registration, the emergency registration is set. Support capability indication is not supported;

Or, when at least one of the MMEs in the PLMN to which the subordinate cell is connected supports emergency registration, the PLMN is considered to support emergency registration; otherwise, when at least one of the PLMNs connected to the subordinate cell supports emergency registration, The emergency registration support capability indication is set to be supported. Otherwise, when the PLMN connected to the subordinate cell does not support emergency registration, the emergency registration support capability indication is not supported.

The method according to claim 5, wherein the emergency service support capability indication is used to indicate whether the subordinate cell supports an emergency call, and specifically includes:

The emergency service support capability indication is used to indicate whether the subordinate cell has an emergency call to the PS, and whether the CS emergency call is supported, so that the PLMN that does not support the PS emergency call can access the emergency call of the user equipment, and pass the circuit. The manner in which the CSFB is switched back is used to assist the user equipment in making an emergency call in the circuit domain.

9. A method according to any one of claims 1-3, characterized in that

The network selection information specifically includes: information of the first PLMN selected by the user equipment; And selecting, according to the network selection information and the support capability information of the PLMN for the emergency service that is connected to the subordinate cell, the user equipment to select the PLMN that can support the emergency service, and the method includes:

If the first PLMN supports the emergency service, select the first PLMN, otherwise, in the PLMN supporting the emergency service, randomly select a PLMN for the user equipment; and then, pass the selected PLMN. The MME establishes a connection.

10. A method according to any one of claims 1-3, characterized in that

The network selection information includes: information of a first PLMN selected by the user equipment, and information of an MME previously registered by the user equipment;

And selecting, according to the network selection information and the PLMN support capability information of the PLMN connected to the subordinate cell, the PLMN that is configured to support the emergency service by the user equipment, where the

If the first PLMN supports the emergency service, the first PLMN is selected; otherwise, referring to the MME previously registered by the user equipment, selecting a PLMN supporting the emergency service for the user equipment, includes: If the PLMN to which the MME is previously registered by the user equipment supports the emergency service, the first PLMN is selected. Otherwise, in the PLMN supporting the emergency service, a PLMN is randomly selected for the UE; and then, in the selected PLMN. A connection is established for the UE to select an MME capable of supporting the emergency service.

11. A method according to any one of claims 1-3, characterized in that

The network selection information specifically includes: the user equipment type of the user equipment is a restricted mode; and the information about the network capability selection information and the PLMN supporting emergency service information connected by the subordinate cell is the user The device selects a PLMN capable of supporting the emergency service to perform the connection, and specifically includes: selecting, by the user equipment in the restricted mode, a PLMN capable of supporting emergency registration to perform connection.

12. A method of network selection, characterized in that:

Obtaining information about the support capability of the subordinate cell sent by the base station to the emergency service; Selecting, by the support capability information, the subordinate cell capable of supporting the emergency service to perform emergency service access.

13. The method of claim 12, wherein

The support capability information for the emergency service includes: an emergency service support capability indication, and/or an emergency registration support capability indication;

The method according to claim 12 or 13, wherein the selecting, by the support capability information, the subordinate cell capable of supporting the emergency service to perform emergency service access comprises: in the subordinate cell The user type is notified to the base station by the network selection information through the network selection information, so that the base station selects a PLMN capable of supporting emergency registration to connect after detecting that the access reason is urgent.

A base station, comprising:

Receiving unit: configured to receive network selection information sent by a user equipment by a subordinate cell capable of supporting emergency services;

a network selection unit, configured to: after detecting that the access reason of the user equipment is an emergency, select, according to the network selection information and the support capability information of the PLMN to the emergency service connected by the subordinate cell, The PLMN supporting the emergency service is connected.

The base station according to claim 15, further comprising:

The acquiring unit is configured to acquire information about the support capability of the network connected to the base station for emergency services.

17. The base station according to claim 16, further comprising:

The indication setting unit is configured to: set the support capability information of the subordinate cell to the emergency service according to the support capability information of the network connected to the base station that is acquired by the acquiring unit;

a sending unit, configured to send the support capability information of the subordinate cell to the emergency service to the user equipment, so that the user equipment selects, according to the supporting capability information of the subordinate cell for the emergency service, a device capable of supporting the emergency service The subordinate cell is referred to for emergency service access.

18. A user equipment, comprising:

The acquiring unit is configured to: acquire the support capability information of the subordinate cell to the emergency service sent by the base station; the cell selection unit is configured to: select, according to the support capability information of the subordinate cell to the emergency service, the emergency to be used by the subordinate cell capable of supporting the emergency service Business access.

The user equipment according to claim 18, further comprising:

The user equipment type notification unit, in the subordinate cell, informs the base station that the user type of the user equipment is a restricted mode by using network selection information, so that the base station detects that the access reason of the user equipment is emergency , selecting, for the user equipment, a PLMN capable of supporting emergency registration