CN103974358A - Switching method, switching device and switching system for heterogeneous networks - Google Patents
Switching method, switching device and switching system for heterogeneous networks Download PDFInfo
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Abstract
The invention discloses a switching method, a switching device and a switching system for heterogeneous networks to solve the problem that quality of service (QoS) of business is not guaranteed due to business interruption and delay and acceptance rejection which are caused by the prior art during load transferring of user equipment (UE). According to an embodiment of the invention, the switching method includes that by first network side equipment, load switching request information which is sent from second network side equipment of current network of a terminal when a partial or whole load of the terminal is determined to switch by the second network side equipment is received, whether to accept the load of the terminal is judged according to the load switching request information, load accepting information is returned to the second network side equipment when the load of the terminal is determined to accept, and a connection with the terminal is established and data transmission with the same is achieved. By the switching method, the switching device and the switching system, continuity and QoS of the terminal business are guaranteed, the business interruption and delay is eliminated, and experiences of users are improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for handover between heterogeneous networks.
Background
With the growing demand of users and the development of communication technologies, more and more technologies and related networks are emerging in the field of wireless communication, such as second generation (2) which can provide wide coveragendGeneration, 2G)/3G/4G mobile communication technologies and networks, and WiFi (Wireless Fidelity) technologies and Wireless Local Area Networks (WLANs) that can provide hotspot coverage. Therefore, a situation in which different communication networks coexist, such as a situation in which a 2G/3G/4G network and a WLAN coexist, is also abundant. In these network coexistence scenarios, how to reasonably select a network by a User Equipment (UE) to obtain a better service and save the power of the UE is a problem that needs to be studied.
Currently, in cellular communication network technologies, there are some technologies for a UE to switch from a 2G/3G/4G network to a WLAN network, so that the WLAN network can be used for traffic offloading. However, since there is no interface connection between the base station and the WLAN access point, the result of high time delay and high packet loss rate in the Service offloading process is caused, so that Quality of Service (QoS) of some services cannot be guaranteed, and user experience is reduced.
An Evolved Packet System (EPS) is a System that supports multiple access technologies and multiple inter-access mobility. In a multi-access scenario, the terminal may be under the common coverage of multiple third Generation Partnership Project (3 GPP) and/or non-3 GPP access networks. The following describes a procedure for switching between different networks by a UE when multiple communication networks coexist.
Fig. 1 is a schematic diagram of a Universal Mobile Telecommunications System (UMTS)/Long Term Evolution (LTE) System and a WLAN coexistence scenario, where in fig. 1, multiple Access Points (APs) of the WLAN exist within a coverage area of a UMTS/LTE base station (Node B in UMTS and eNB in LTE). The coverage of the access point is relatively small compared to the coverage of the base station.
Under the above scenario, a currently supported architecture for interworking between UMTS/LTE and WLAN networks is shown in fig. 2, and the architecture is based on an S2c interface between a Packet Data Network (PDN) Gateway (Gateway) and a UE to implement the interworking.
When the architecture is used for interoperation between a UMTS/LTE Network and a WLAN Network, the UE can select between the UMTS/LTE Network and the WLAN Network based on an Access Network Discovery and Selection Function (ANDSF) mechanism. Fig. 3 is a schematic diagram of a communication architecture between the UE and the ANDSF entity, where the UE and the ANDSF entity interact through an S14 interface, the interface is an Internet Protocol (IP) -based interface, and the communication between the UE and the ANDSF entity has two modes, i.e., Pull and Push.
The ANDSF entity provides the UE with information related to network discovery and selection based on operator policy, which may specifically adopt: Inter-System mobility Policy (ISMP), Access Network Discovery Information (andsi), and Inter-System Routing Policy (ISRP), among others.
The ISMP is a series of operator-defined rules and preference information, and the policy defines whether to allow cross-system mobility, the access technology type most suitable for accessing an Evolved Packet Core (EPC), different priorities of different access technologies, and the like. The ISMP may be pre-configured in the UE, or may be sent again when requested by the UE, or pushed to the terminal by the ANDSF entity when a certain trigger condition is satisfied. For example, the ANDSF entity may issue a trigger condition that WLAN is prioritized over LTE, so that when the UE is under both coverage, WLAN system access is preferred.
The ANDSF may provide the terminal with a list of Access networks available in its vicinity that conform to the type of Access requested by the terminal, and related parameters, such as Access technology (e.g., WLAN, WiMAX (world wide interoperability for Microwave Access), etc.), radio Access network identification, carrier frequency, etc.
ISRP contains some information needed for cross-system routing, which can be used to decide for terminals with multiple radio access interfaces, such as terminals supporting IP Flow Mobility (IFOM) or Multiple Access PDN Connectivity (MAPCON): a) which available access network to use for transmitting data when certain routing conditions are met; b) when a certain Access network is disabled for a particular IP data flow and/or a particular Access Point Name (APN).
The existing protocol provides that the ANDSF entity selects the ISMP, ANDI and ISRP to be provided to the terminal according to the operator requirements and roaming agreements, and the ANDSF entity may provide the above three policies simultaneously or only some of them. The ANDSF entity may interact with some database in the operator network, such as a Home Subscriber Server (HSS), to obtain the required information.
When the terminal receives access network information that is available and has a higher priority than the currently camped-on access network, the terminal should perform a discovery and reselection procedure to that high priority if allowed by the user. When the terminal automatically selects an access network, it cannot access the EPC through the access network marked as barred in the ISMP.
The UMTS/LTE network uses WLAN for offloading (offload), which may employ seamless offloading (seamless offload) and non-seamless offload (non-seamless offload). Fig. 4A is a schematic diagram of an architecture for performing offload using WLAN in a seamless offload UMTS/LTE network, and fig. 4B is a schematic diagram of an architecture for performing offload using WLAN in a seamless offload UMTS/LTE network.
The seamless offloading mode refers to that there is a connection between the WLAN and a 3GPP Core Network (CN), and after the air interface offloading, the service still accesses the Core Network of the 3GPP (including UMTS/LTE). The split offloading mode means that there is no connection between the WLAN and the 3GPP CN, and after the air interface offloading, the service is directly accessed to the Internet without going through the 3GPP CN.
The diversion through the WLAN may be the transfer of part of the bearers of the UE, or the transfer of all the bearers of the UE. If it is a partial bearer transfer, the UE will have a connection to both the UMTS/LTE and WLAN networks at the same time. If it is a transfer of all bearers, the UE has a connection only with the WLAN after the transfer.
In summary, the selection between heterogeneous networks is UE-based, that is, the UE selects between different networks according to the policy information stored by the UE. When the UE transfers the service from one network to another network, the UE mainly interacts with a core network and adopts a strategy of disconnecting the original network and accessing the new network. But this approach can introduce a relatively large service interruption delay. In addition, as the process does not have information interaction between access networks, admission rejection is caused, the results of service QoS and the like cannot be ensured, and the user experience is reduced.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for switching between heterogeneous networks, which are used for solving the problems that in the prior art, service interruption time delay and admission rejection are caused when UE (user equipment) is transferred, and the QoS (quality of service) cannot be ensured.
The method for switching between heterogeneous networks provided by the embodiment of the invention comprises the following steps:
a first network side device receives bearer switching request information sent by a second network side device of a network where a terminal is located currently, wherein the bearer switching request information is sent by the second network side device when determining that partial or all bearers of the terminal need to be switched;
the first network side equipment judges whether the first network side equipment can accept the load needing to be switched of the terminal according to the load switching request information;
when determining to admit the bearer which needs to be switched of the terminal, the first network side device returns bearer admission information to the second network side device;
and the first network side equipment establishes connection with the terminal and performs data transmission with the terminal.
An apparatus for switching between heterogeneous networks according to an embodiment of the present invention includes:
the terminal comprises a receiving module, a switching module and a switching module, wherein the receiving module is used for receiving bearer switching request information sent by second network side equipment of a network where the terminal is located currently, and the bearer switching request information is sent by the second network side equipment when determining that part or all of bearers of the terminal need to be switched;
the judging module is used for judging whether the bearing needing to be switched of the terminal can be accepted or not according to the bearing switching request information;
a sending module, configured to return bearer admission information to the second network-side device when it is determined to admit a bearer that needs to be switched of the terminal;
and the transmission module is used for establishing connection with the terminal and transmitting data with the terminal.
The network side device provided by the embodiment of the invention comprises:
the receiving module is used for receiving bearer switching request information sent by second network side equipment of a network where a terminal is located currently, and receiving bearer admission information returned by first network side equipment of a network to be switched of the terminal, wherein the bearer switching request information is sent by the second network side equipment when determining that part or all of bearers of the terminal need to be switched;
a sending module, configured to send the bearer switching request message to the first network side device, inquire whether the first network side device accepts a bearer that needs to be switched of the terminal, and return the received bearer acceptance message to the second network side device.
The system for switching between heterogeneous networks provided by the embodiment of the present invention includes:
the second network side equipment is used for sending the bearing switching request information to the first network side equipment when determining that part or all of the bearing of the terminal needs to be switched; receiving the bearer admission information returned by the first network side equipment;
the first network side equipment is used for receiving the bearer switching request information and judging whether the first network side equipment can accept the bearer of the terminal according to the bearer switching request information; when determining to admit the bearer of the terminal, returning bearer admission information to the second network side equipment; establishing connection with the terminal, and performing data transmission with the terminal;
and the terminal is used for establishing connection with the first network side equipment and carrying out data transmission with the first network side equipment.
In the switching process, the first network side equipment receives the bearing switching request information sent by the second network side equipment of the current network of the terminal, when the first network side equipment determines that the first network side equipment can accept the bearing of the terminal, the first network side equipment returns the bearing acceptance information to the second network side equipment, then the first network side equipment establishes connection with the terminal, and performs data transmission with the terminal. In the embodiment of the invention, when the bearing of the terminal needs to be switched, the bearing of the terminal is switched by negotiating with the network side equipment of the network to be switched of the terminal, and when the network side equipment of the network to be switched of the terminal can accept the bearing of the terminal, the bearing of the terminal is switched, so that the continuity and the QoS of the terminal service can be ensured, the service interruption time delay is eliminated, and the user experience is improved.
Drawings
FIG. 1 is a diagram illustrating a network architecture in a scenario of coexistence of UMTS/LTE and WLAN networks in the background art;
FIG. 2 is an architecture diagram of the interworking between UMTS/LTE and WLAN networks in the background art;
fig. 3 is a diagram illustrating a communication structure between a UE and an ANDSF in the related art;
fig. 4A is a schematic diagram of an architecture for performing offloading by using a WLAN in a UMTS/LTE network using a seamless offloading manner in the background art;
fig. 4B is a schematic diagram of an architecture for performing offloading by using a WLAN in a UMTS/LTE network using a slotted offloading method in the background art;
fig. 5 is a schematic diagram illustrating a handover process between heterogeneous networks according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram illustrating an architecture of handover of a bearer of a UE from an LTE system to a WLAN network according to an embodiment of the present invention;
FIG. 7 is a flowchart of UE handover from a base station to an access point according to an embodiment of the present invention;
fig. 8A is a flowchart of handover of all bearers of a UE from a base station to an access point according to an embodiment of the present invention;
fig. 8B is a schematic diagram of a network architecture for handover of a bearer of a UE from a base station to an access point according to an embodiment of the present invention;
FIG. 9 is a flowchart of UE handover from an access point to a base station according to an embodiment of the present invention;
FIG. 10 is a flowchart illustrating handover of all bearers of a UE from an access point to a base station according to an embodiment of the present invention;
FIG. 11 is a flowchart illustrating handover of a partial bearer of a UE from a base station to an access point according to another embodiment of the present invention;
FIG. 12 is a flowchart illustrating handover of all bearers of a UE from a base station to an access point according to another embodiment of the present invention;
FIG. 13 is a flowchart illustrating handover of a partial bearer of a UE from an access point to a base station according to another embodiment of the present invention;
FIG. 14 is a flowchart illustrating handover of all bearers of a UE from an access point to a base station according to another embodiment of the present invention;
fig. 15 is a schematic structural diagram of a system for handover between heterogeneous networks according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a handover device between heterogeneous networks according to an embodiment of the present invention;
fig. 17 is a schematic diagram of a gateway structure according to an embodiment of the present invention.
Detailed Description
In order to effectively improve the QoS of a terminal service, ensure the continuity of the terminal service and reduce the interruption delay of the terminal service when the load of a terminal is switched between heterogeneous networks, embodiments of the present invention provide a method, an apparatus and a system for switching between heterogeneous networks.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Referring to fig. 5, a handover method between heterogeneous networks according to an embodiment of the present invention includes the following steps:
s501: a first network side device receives bearer switching request information sent by a second network side device of a network where a terminal is located currently;
the bearer switching request information is sent by the second network side device when determining that part or all of bearers of the terminal need to be switched.
Further, when the network side device (i.e. the second network side device) of the network where the terminal (UE) is currently located judges that the bearer of the UE needs to be switched according to the current channel condition or the self-load condition, the network side device (i.e. the first network side device) of the network to be switched of the UE sends bearer switching request information. The bearer switching request message may be a partial bearer switching request message for requesting to switch a partial bearer of the UE, or may be a complete bearer switching request message for requesting to switch a complete bearer of the UE.
In this embodiment of the present invention, the first network-side device may be a base station or an access point, and the corresponding second network-side device may be an access point or a base station, specifically: if the load of the UE is switched from the WLAN to the UTMS/LTE network, the first network side equipment is a base station, and the second network side equipment is an access point; and if the bearing of the UE is switched from the UTMS/LTE network to the WLAN, the first network side equipment is the access point, and the second network side equipment is the base station.
S502: the first network side equipment judges whether the first network side equipment can accept the load of the terminal according to the load switching request information;
specifically, after receiving the bearer switching request message, the first network side device needs to determine whether the bearer that needs to be switched of the UE can be admitted or not, in order to ensure QoS of the UE and reduce interruption delay of the UE service after the bearer of the UE is switched.
Further, when the second network side device sends the partial bearer switching request information, the first network side device judges whether the partial service of the UE can be admitted according to the partial bearer switching request information; when the second network side equipment sends all the bearer switching request information, the first network side equipment judges whether all services of the UE can be admitted or not according to the all the bearer switching request information.
S503: when determining to admit the bearer which needs to be switched of the terminal, the first network side equipment returns bearer admission information to the second network side equipment;
specifically, the first network side device determines whether it can accept the bearer that needs to be switched of the UE according to the received bearer switching request information sent by the second network side device, and returns the bearer acceptance information to the second network side device when determining that it can accept the bearer that needs to be switched of the UE.
Further, when the first network side device determines that a certain service or certain services of the UE can be admitted, the first network side device returns partial bearer admission information indicating that the first network side device can admit a partial bearer of the UE to the second network side device; when the first network side device determines that all services of the UE can be admitted, the first network side device returns all bearer admission information indicating that the first network side device can admit all bearers of the UE to the second network side device.
S504: the first network side equipment establishes connection with a terminal and performs data transmission with the terminal;
specifically, after the first network-side device determines that the bearer of the UE can be accepted, the first network-side device establishes a connection with the UE, and after the first network-side device determines that the connection between the first network-side device and the UE is successfully established, the first network-side device returns response information for indicating that the UE is successfully accessed to the first network-side device to the second network-side device, and after the core network releases the bearer of the UE, the first network-side device can perform data transmission with the UE.
Further, in S504, after the first network-side device establishes a connection with the terminal and before the first network-side device performs data transmission with the terminal, the method further includes:
the first network side device returns response information for indicating that the terminal successfully accesses the first network side device to the second network side device, the first network side device sends a bearer transfer request to the core network (that is, the first network side device requests the core network to transfer a bearer that needs to be switched of the terminal), and the first network side device receives bearer transfer information sent by the core network, wherein the bearer transfer information is sent by the core network after the bearer that needs to be switched of the terminal is transferred.
As an implementation form, the method further includes:
after receiving the bearer transfer request sent by the first network side device, the core network directly releases the bearer of the terminal in the second network side device, which needs to be switched.
As another implementation, the method further includes:
after receiving the response information sent by the first network side equipment, the second network side equipment sends a bearer release request to the core network;
and after receiving the bearer release request sent by the second network side device, the core network releases the bearer which needs to be switched in the second network side device by the terminal.
In order to implement the analysis and interaction of the handover information between the first network-side device and the second network-side device, it is preferable that the third network-side device may analyze the handover information, and the access point may also analyze the handover information.
Further, in S501, the receiving, by the first network-side device, bearer switching request information sent by the second network-side device of the network where the terminal is currently located includes:
the first network side equipment directly receives the bearer switching request information sent by the second network side equipment; or,
the first network side device receives bearer switching request information sent by a third network side device, wherein the bearer switching request information is sent to the third network side device by a second network side device.
Further, in S503, the returning, by the first network-side device, the bearer admission information to the second network-side device includes:
the first network side equipment directly returns the bearing admission information to the second network side equipment; or,
and the first network side equipment returns the bearing admission information to the second network side equipment through the third network side equipment.
In the embodiment of the invention, when the bearer of the UE is switched, the second network side equipment and the first network side equipment negotiate, and after the first network side equipment can accept the bearer of the UE needing to be switched, the bearer of the UE is switched, so that the continuity and the QoS of the UE service can be ensured, the service interruption time delay is eliminated, and the user experience is improved.
In the embodiment of the invention, no matter the bearing of the UE is switched from the UTMS/LTE network to the WLAN or from the WLAN to the UTMS/LTE network, the bearing switching is realized through the interaction between the base station and the access point.
In the embodiment of the invention, in order to resolve the X2/S1 protocol between the base station and the access point, a unit capable of resolving the X2/S1 protocol can be added between the base station and the access point, so that the handover process of the UE bearer between the base station and the Access Point (AP) is completed. Specifically, the unit for resolving the X2/S1 protocol may be located in the third network side device, or may be located in the AP (or the base station).
The unit having the resolved X2/S1 protocol handles control plane signaling, and may interact with the first network side device for UE information, bearer information, admission information, and the like. The data plane link of the core network is still directly connected with the base station and the AP, and does not pass through the unit. The unit is only a logical entity, and may specifically be a third network side device or a new unit in the AP (or the base station).
The third network side device of the embodiment of the present invention includes, but is not limited to, one of the following devices:
a gateway, a router, an access control device, a heterogeneous network coordination device, etc.
Preferably, the third network side device is a gateway.
Referring to fig. 6, in the embodiment, the new unit is a unit capable of analyzing an X2/S1 protocol between a base station and an access point, and the new unit can implement a function of switching an X2 or S1 protocol with the base station. The interface between the new entity and the access point may be standardized, i.e. when the new cell is located in a third network-side device (e.g. a gateway), it may be an interface inside the device, i.e. when the new cell is located in the access point.
In the embodiment of the present invention, when the new cell is located in the access point, the bearer handover request information sent by the base station may be parsed, but when the new cell is located in a third network side device (e.g., a gateway), in order to implement the whole handover process, the interaction between the base station and the access point is implemented by the third network side device.
The following describes the whole bearer switching process of the UE by taking the new cell located in the gateway and the AP as examples.
Embodiment 1, referring to fig. 7, a process for switching a partial bearer of a UE from a base station to an access point according to an embodiment of the present invention includes the following steps:
s701: when the base station judges that partial load of the UE needs to be switched, the base station sends partial load switching request information to the gateway through an X2/S1 interface, wherein the partial load switching request information carries identification information of the UE;
s702: after receiving the partial bearer switching request information, the gateway sends the partial bearer switching request information to the access point and inquires whether the service of the UE can be admitted to the access point;
s703: the access point judges whether the service of the UE can be accepted, when the access point can accept a certain service of the UE, the gateway returns partial bearing acceptance information to the base station at an X2/S1 interface, wherein the partial bearing acceptance information carries the identification information of the service which can be accepted;
s704: after receiving the partial bearing admission information, the base station informs the UE to switch partial bearing;
s705: the UE associates with the AP, after association is successful, the AP informs the gateway, the gateway informs the base station, and the UE has successfully accessed the WLAN;
s706: a base station sends a partial bearer release request to a core network to request to release a partial bearer of UE, wherein the partial bearer release request carries identification information of a service to be released;
s707: the AP sends a part bearing transfer request to a core network to request to transfer part of the service of the UE to the WLAN, wherein the part bearing transfer request carries identification information of the service to be transferred;
s708: the core network returns part of the bearing transfer information to the AP, and data transmission is carried out between the AP and the UE.
In this embodiment, for the case of partial bearer transfer, in order to accelerate the handover speed, the base station may request the core network to release the partial bearer of the UE while notifying the UE to perform the partial bearer handover, without waiting for the information that the UE successfully accesses the WLAN and is returned by the gateway.
The above procedure is described by taking a partial bearer of the UE as an example, and the following describes a procedure of switching all bearers of the UE.
Embodiment 2, referring to fig. 8A, a process for switching all bearers of a UE from a base station to an access point according to an embodiment of the present invention includes the following steps:
s801: when the base station judges that all the bearers of the UE need to be switched, the base station sends all bearer switching request information to a gateway through an X2/S1 interface, wherein the all bearer switching request information carries the identification information of the UE;
s802: after receiving all the bearer switching request information, the gateway sends the all the bearer switching request information to the access point, and inquires whether all services of the UE can be admitted to the access point;
s803: the access point judges whether the access point can accept all the services of the UE, and when the access point can accept all the services of the UE, the gateway returns all the bearer acceptance information to the base station at an X2/S1 interface;
s804: after receiving the all-bearer admission information, the base station informs the UE to switch all bearers;
s805: the UE associates with the AP, after association is successful, the AP informs the gateway, the gateway informs the base station, and the UE has successfully accessed the WLAN;
s806: the base station sends a request for releasing all the bearers to a core network to request to release all the bearers of the UE;
s807: the AP sends a request of all the load transfer to the core network to request to transfer all the services of the UE to the WLAN;
s808: the core network returns all the bearing transfer information to the AP, and data transmission is carried out between the AP and the UE.
The above two embodiments describe flowcharts for switching a part of bearers or all bearers of the UE from the base station to the access point.
Referring to fig. 8B, the network architecture for switching the bearer of the UE from the base station to the access point according to the embodiment of the present invention is shown, where the base station may be an RNC + NodeB of a UMTS system, or an eNB of an LTE system. The device for assisting the interoperation between the base station and the AP is a gateway, which has all the logical functions of the new unit described above. The interface between the base station and the gateway is an X2 interface. A new interface is arranged between the gateway and the access point 1 and is used for interacting UE information, bearing information, admission information and the like.
Currently, the UE is under the coverage of both the base station and the access point 1, and the UE only communicates with the base station. Further, the base station decides to switch part or all bearers of the UE to the access point 1 according to the channel condition or the reason of the self load, and then the base station sends part or all of the bearer switching request information to the gateway through the X2 interface. After receiving the information of partial or all bearer switching requests, the gateway inquires the access point 1 whether to admit partial or all services of the UE. When the access point 1 can admit a certain service or all services, part or all of the bearer admission information is returned to the base station through the gateway at the X2 interface. After receiving the partial or all bearer admission information, the base station requests the core network to release the partial or all bearers of the UE and informs the UE to switch the partial or all bearers. After receiving a part or all of the bearer switching commands, the UE associates with the access point 1, and after successful association, the access point 1 requests the core network to transfer a part or all of the services of the UE to the WLAN network.
The following describes a procedure for switching a part of bearers or all bearers of a UE from an access point to a base station by using a specific embodiment.
Embodiment 3, referring to fig. 9, a process for switching a partial bearer of a UE from an access point to a base station according to an embodiment of the present invention includes the following steps:
s901: when the access point judges that partial load of the UE needs to be switched, the access point sends partial load switching request information to the gateway, wherein the partial load switching request information carries the identification information of the UE;
s902: after receiving the partial bearer switching request information, the gateway sends the partial bearer switching request information to the base station through an X2/S1 interface, and inquires whether the service of the UE can be admitted to the base station;
s903: the base station judges whether the service of the UE can be accepted, and when the service of the UE can be accepted, the base station returns partial bearing acceptance information to the gateway at an X2/S1 interface, wherein the partial bearing acceptance information carries the identification information of the service which can be accepted;
s904: after receiving the partial bearer admission information, the access point informs the UE to switch partial bearers;
s905: the UE is accessed to the base station, after the UE is successfully accessed, the base station informs the gateway, the gateway informs the access point, and the UE has been successfully accessed to the base station;
s906: the access point sends a partial bearer release request to the core network to request to release a partial bearer of the UE, wherein the partial bearer release request carries identification information of a service to be released;
s907: the base station sends a part bearing transfer request to a core network to request to transfer part of the service of the UE to the base station, wherein the part bearing transfer request carries identification information of the service to be transferred;
s908: the core network returns part of the bearing transfer information to the base station, and data transmission is carried out between the base station and the UE.
In this embodiment, for the case of partial bearer transfer, in order to accelerate the handover speed, the AP may request the core network to release the partial bearer of the UE while notifying the UE to perform the partial bearer handover, without waiting for the information that the UE successfully accesses the base station and is returned by the gateway.
Embodiment 4, referring to fig. 10, a process for switching all bearers of a UE from an access point to a base station according to an embodiment of the present invention includes the following steps:
s1001: when the access point judges that all the bearers of the UE need to be switched, the access point sends all bearer switching request information to the gateway, wherein the all bearer switching request information carries the identification information of the UE;
s1002: after receiving all the bearer switching request information, the gateway sends the all the bearer switching request information to the base station through an X2/S1 interface, and inquires whether all services of the UE can be admitted to the base station;
s1003: the base station judges whether all services of the UE can be admitted, and when the base station can admit all the services of the UE, the base station returns all bearer admission information to the gateway at an X2/S1 interface;
s1004: after receiving the all-bearer admission information, the access point informs the UE to switch all bearers;
s1005: the UE is accessed to the base station, after the UE is successfully accessed, the base station informs the gateway, the gateway informs the access point, and the UE has been successfully accessed to the base station;
s1006: and the access point sends a request for releasing all the bearers to the core network to request to release all the bearers of the UE.
S1007: the base station sends all load transfer requests to a core network to request to transfer all services of the UE to the base station;
s1008: and the core network returns all the bearing transfer information to the base station, and data transmission is carried out between the base station and the UE.
It should be noted that, currently, the UE is located under the coverage of both the base station and the access point 1, and the UE only communicates with the access point 1. And the subsequent access point 1 judges to switch the partial or all load of the UE to the base station according to the channel condition or the self load, and the access point 1 requests a gateway to switch the partial or all load of the UE. And the gateway and the base station use an X2 interface to carry out interaction of partial or all bearing switching information. After judging that the base station can accept part or all of the services of the UE, the base station informs the gateway, then the gateway informs the access point 1, and the access point informs the UE of transferring the bearers and simultaneously requests the core network to release the bearers. After the UE accesses the base station, the base station requests the core network to establish a part of or all of the bearers of the UE.
The above embodiment has been described by taking as an example a unit (i.e., a new cell) for assisting communication between the base station and the access point, but it is needless to say that the cell may be located in the access point, and the following description will be given by way of specific embodiments.
Embodiment 5, referring to fig. 11, a process of handing over a partial bearer of another UE from a base station to an access point according to an embodiment of the present invention includes the following steps:
s1101: when the base station judges that partial load of the UE needs to be switched according to the current channel condition or the load condition of the base station, the base station sends partial load switching request information to the AP through an X2 interface, wherein the partial load switching request information carries the identification information of the UE;
s1102: after receiving the partial bearer switching request information, the AP determines whether the service of the UE can be admitted, and returns partial bearer admission information to the base station through the X2 interface when the AP can admit a certain service of the UE, where the partial bearer admission information carries identification information of the service that can be admitted;
s1103: after receiving the partial bearing admission information, the base station informs the UE to switch partial bearing;
s1104: the UE associates with the AP, and after the association is successful, the AP informs the base station that the UE has successfully accessed the WLAN network;
s1105: a base station sends a partial bearer release request to a core network to request to release a partial bearer of UE, wherein the partial bearer release request carries identification information of a service to be released;
s1106: the AP sends a part bearing transfer request to a core network to request to transfer part of the service of the UE to the WLAN, wherein the part bearing transfer request carries identification information of the service to be transferred;
s1107: the core network returns part of the bearing transfer information to the AP, and data transmission is carried out between the AP and the UE.
Embodiment 6, referring to fig. 12, a process of switching all bearers of another UE from a base station to an access point according to an embodiment of the present invention includes the following steps:
s1201: when the base station judges that all bearers of the UE need to be switched according to the current channel condition or the load condition of the base station, the base station sends all bearer switching request information to the AP through an X2 interface, wherein the all bearer switching request information carries the identification information of the UE;
s1202: after receiving the all-bearer switching request information, the AP determines whether all services of the UE can be admitted, and when the AP can admit all services of the UE, returns all-bearer admission information to the base station through the X2 interface;
s1203: after receiving the all-bearer admission information, the base station informs the UE to switch all bearers;
s1204: the UE associates with the AP, and after the association is successful, the AP informs the base station that the UE has successfully accessed the WLAN network;
s1205: the base station sends a request for releasing all the bearers to a core network to request to release all the bearers of the UE;
s1206: the AP sends a request of all the load transfer to the core network to request to transfer all the services of the UE to the WLAN;
s1207: the core network returns all the bearing transfer information to the AP, and data transmission is carried out between the AP and the UE.
The device for assisting the interoperation between the base station and the AP in the above two embodiments of the present invention is a new unit within the AP, and the device has all the logical functions of the new unit.
It should be noted that, currently, the UE is under the coverage of both the base station and the access point 1, and the UE only communicates with the base station. And the subsequent base station judges to switch the UE to the access point 1 according to the channel condition or the self load, and then the base station sends part or all of the bearer switching request information to the access point 1 through an X2 interface. After receiving the bearer switching request message, the access point 1 determines whether to admit part or all of the bearers of the UE. When access point 1 can admit part or all of the traffic of the UE, access point 1 returns part or all of the bearer admission information to the base station at the X2 interface. After receiving the partial or all bearer admission information, the base station requests the core network to release the partial or all bearers of the UE and informs the UE to perform handover. After receiving the switching command, the UE associates with the access point 1, and after successful association, the access point 1 requests the core network to transfer part or all of the services of the UE to the WLAN.
The above two embodiments describe the handover procedure from the access point to the station when the unit with parsing function is located in the AP, and the following describes the handover procedure from the AP to the base station when the unit with parsing function is located in the AP by using a specific embodiment.
Embodiment 7, referring to fig. 13, a process of handing over a partial bearer of another UE from an access point to a base station according to an embodiment of the present invention includes the following steps:
s1301: when the access point judges that partial load of the UE needs to be switched according to the current channel condition or the load condition of the access point, the access point sends partial load switching request information to the base station through an X2 interface, wherein the partial load switching request information carries the identification information of the UE;
s1302: the base station judges whether the service of the UE can be accepted or not, and when the service of the UE can be accepted, the base station returns partial bearing acceptance information to the access point at an X2 interface, wherein the partial bearing acceptance information carries the identification information of the service which can be accepted;
s1303: after receiving the partial bearer admission information, the access point informs the UE to switch partial bearers;
s1304: the UE is accessed to the base station, and after the UE is successfully accessed, the base station informs the access point that the UE has been successfully accessed to the base station;
s1305: the access point sends a partial bearer release request to the core network to request to release a partial bearer of the UE, wherein the partial bearer release request carries identification information of a service to be released;
s1306: the base station sends a part bearing transfer request to a core network to request to transfer part of the service of the UE to the base station, wherein the part bearing transfer request carries identification information of the service to be transferred;
s1307: the core network returns part of the bearing transfer information to the base station, and data transmission is carried out between the base station and the UE.
Embodiment 8, referring to fig. 14, a process of switching all bearers of another UE from an access point to a base station according to an embodiment of the present invention includes the following steps:
s1401: when the access point judges that all bearers of the UE need to be switched according to the current channel condition or the load condition of the access point, the access point sends all bearer switching request information to the base station through an X2 interface, wherein the all bearer switching request information carries the identification information of the UE;
s1402: the base station judges whether all services of the UE can be admitted, and when the base station can admit all the services of the UE, the base station returns all bearing admission information to the access point at an X2 interface;
s1403: after receiving the all-bearer admission information, the access point informs the UE to switch all bearers;
s1404: the UE is accessed to the base station, and after the UE is successfully accessed, the base station informs the access point that the UE has been successfully accessed to the base station;
s1405: the access point sends a request for releasing all the bearers to the core network to request to release all the bearers of the UE;
s1406: the base station sends all load transfer requests to a core network to request to transfer all services of the UE to the base station;
s1407: and the core network returns all the bearing transfer information to the base station, and data transmission is carried out between the base station and the UE.
In the above two embodiments of the present invention, the unit having the parsing function is located in the AP.
It should be noted that, currently, the UE is located under the coverage of both the base station and the access point 1, and the UE only communicates with the access point 1. The subsequent access point 1 decides to switch the UE to the base station according to the channel condition or the reason of its own load, and then the access point 1 sends part or all of the bearer switching request information to the base station through the X2 interface. After receiving the partial or all bearer switching request information, the base station judges whether the partial or all bearers of the UE can be admitted or not. When the base station can admit part or all of the traffic of the UE, the base station returns part or all of the bearer admission information to the access point 1 at the X2 interface. After receiving the partial or all bearer admission information, the access point 1 requests the core network to release the partial or all bearers of the UE, and notifies the UE to perform handover. And after the UE receives the switching command, accessing the base station, and after the UE is successfully accessed, requesting the core network by the base station to transfer part or all services of the UE to the base station.
In the embodiment of the invention, when the bearing of the terminal is switched, the second network side equipment negotiates with the first network side equipment, and when the first network side equipment can accept the bearing of the terminal, the bearing of the terminal is switched, so that the continuity and the QoS of the terminal service can be ensured, the service interruption time delay is eliminated, and the user experience is improved.
The above method process flow may be implemented by a software program, which may be stored in a storage medium, and when the stored software program is called, the above method steps are performed.
Based on the foregoing embodiment, referring to fig. 15, a handover system between heterogeneous networks according to an embodiment of the present invention includes:
the second network-side device 151 is configured to send bearer switching request information to the first network-side device 152 when determining that part or all of bearers of the terminal 153 need to be switched; receiving bearer admission information returned by the first network-side device 152; (ii) a
The first network side device 152 is configured to receive the bearer switching request information, and determine whether or not it can accept the bearer of the terminal 153 according to the bearer switching request information; when determining to admit the bearer of the terminal 153, returning bearer admission information to the second network-side device 151; establishing connection with the terminal 153, and performing data transmission with the terminal 153;
and the terminal 153 is configured to establish a connection with the first network-side device 151 and perform data transmission with the first network-side device 151.
Further, the communication system further includes:
the third network-side device 154 is configured to receive the bearer handover request information sent by the second network-side device 151, and send the bearer handover request information to the first network-side device 152.
Further, the third network-side device 154 is further configured to:
receiving the bearer admission information returned by the first network-side device 152, and sending the bearer admission information to the second network-side device 151.
Further, the first network-side device 152 is further configured to: returning response information for indicating that the terminal successfully accesses the first network side device 152 to the second network side device 151, sending a bearer transfer request to the core network device 155, and receiving bearer transfer information sent by the core network device 155;
the second network-side device 151 is further configured to: receiving response information sent by the first network-side device 152 that the terminal successfully accesses the first network-side device 152, and sending a bearer release request to the core network device 155;
the system further comprises: the core network device 155 is configured to receive the bearer transfer request sent by the first network-side device 152, transfer the bearer of the terminal 153 that needs to be switched, and return the bearer transfer information to the first network-side device 152.
Further, the second network-side device 151 is further configured to:
receiving response information sent by the first network-side device 152 and used for indicating that the terminal 153 successfully accesses the first network-side device 151, and sending a bearer release request to the core network device 155;
the core network device 155 is further configured to:
receiving the bearer transfer request sent by the first network-side device 152, transferring the bearer of the terminal 153 that needs to be switched, and returning the bearer transfer information to the first network-side device 152.
Further, the system further comprises:
the third network-side device 154 is configured to receive response information, which is sent by the first network-side device 152 and used to indicate that the terminal successfully accesses the first network-side device 152, and send the response information to the second network-side device 151.
Further, the first network-side device 152 is a base station, and the second network-side device 151 is an access point; alternatively, the first network-side device 152 is an access point and the second network-side device 151 is a base station.
Based on the foregoing embodiment, referring to fig. 16, an apparatus for switching between heterogeneous networks according to an embodiment of the present invention includes:
a receiving module 161, configured to receive bearer switching request information sent by a second network side device of a network where the terminal is currently located, where the bearer switching request information is sent when the second network side device determines that part or all of bearers of the terminal need to be switched;
the judging module 162 is configured to judge whether the bearer that needs to be switched of the terminal can be accepted by the terminal according to the bearer switching request information;
a sending module 163, configured to return bearer admission information to the second network-side device when determining that a bearer of the admission terminal needs to be switched;
and a transmission module 164, configured to establish a connection with the terminal and perform data transmission with the terminal.
Further, the receiving module 161 is specifically configured to:
directly receiving bearer switching request information sent by second network side equipment; or,
and receiving bearer switching request information sent by third network side equipment, wherein the bearer switching request information is sent to the third network side equipment by the second network side equipment.
Further, the sending module 163 is specifically configured to:
directly returning the bearing admission information to the second network side equipment; or,
and returning the bearing admission information to the second network side equipment through the third network side equipment.
Further, the sending module 163 is further configured to:
directly returning response information for indicating that the terminal is successfully accessed to the device to the second network side equipment, sending a bearing transfer request to the core network, and receiving bearing transfer information sent by the core network; or,
and returning response information for indicating that the terminal is successfully accessed to the device to the second network side equipment through the third network side equipment, sending a bearing transfer request to the core network, and receiving the bearing transfer information sent by the core network.
Preferably, the third network side device is a gateway.
Preferably, the switching means is located in a base station or an access point.
Based on the foregoing embodiment, referring to fig. 17, a network-side device provided in an embodiment of the present invention includes:
the receiving module 171 is configured to receive bearer switching request information sent by a second network side device of a network where the terminal is currently located, and receive bearer admission information returned by a first network side device of a network to be switched of the terminal, where the bearer switching request information is sent by the second network side device when determining that part or all of bearers of the terminal need to be switched;
a sending module 172, configured to send the bearer switching request information to the first network side device, inquire whether the first network side device accepts the bearer that needs to be switched of the terminal, and return the received bearer acceptance information to the second network side device.
Further, the receiving module 171 is further configured to: receiving response information which is sent by first network side equipment and used for indicating that a terminal is successfully accessed to the first network side equipment;
the sending module 172 is further configured to: and sending the response information to the second network side equipment.
The embodiment of the invention provides a method, a device and a system for switching heterogeneous networks, wherein in the switching process, a first network side device receives bearing switching request information sent by a second network side device of a network where a terminal is located currently, when the first network side device determines that the first network side device can receive a bearing needing to be switched of the terminal, the first network side device returns the bearing receiving information to the second network side device, then the first network side device establishes connection with the terminal, and data transmission is carried out between the first network side device and the second network side device. In the embodiment of the invention, when the bearing of the terminal is switched, the first network side equipment and the second network side equipment negotiate, and when the first network side equipment can accept the bearing of the terminal, the bearing of the terminal is switched, so that the continuity and the QoS of the terminal service can be ensured, the service interruption delay is eliminated, and the user experience is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (23)
1. A method for handover between heterogeneous networks, the method comprising:
a first network side device receives bearer switching request information sent by a second network side device of a network where a terminal is located currently, wherein the bearer switching request information is sent by the second network side device when determining that partial or all bearers of the terminal need to be switched;
the first network side equipment judges whether the first network side equipment can accept the load needing to be switched of the terminal according to the load switching request information;
when determining to admit the bearer which needs to be switched of the terminal, the first network side device returns bearer admission information to the second network side device;
and the first network side equipment establishes connection with the terminal and performs data transmission with the terminal.
2. The handover method of claim 1, wherein the receiving, by the first network-side device, the bearer handover request information sent by the second network-side device specifically includes:
the first network side equipment directly receives the bearer switching request information sent by the second network side equipment;
or the first network side device receives bearer switching request information sent by a third network side device, where the bearer switching request information is sent to the third network side device by the second network side device.
3. The handover method of claim 1, wherein the returning, by the first network-side device, bearer admission information to the second network-side device specifically comprises:
the first network side equipment directly returns the bearing admission information to the second network side equipment; or,
and the first network side equipment returns the bearing admission information to the second network side equipment through third network side equipment.
4. The handover method according to claim 1, wherein after the first network-side device establishes the connection with the terminal and before the first network-side device performs data transmission with the terminal, the method further comprises:
the first network side equipment directly returns response information for indicating that the terminal is successfully accessed to the first network side equipment to the second network side equipment, the first network side equipment sends a bearing transfer request to a core network, and the first network side equipment receives the bearing transfer information sent by the core network; or,
the first network side device returns response information for indicating that the terminal is successfully accessed to the first network side device to the second network side device through a third network side device, the first network side device sends a bearer transfer request to the core network, and the first network side device receives the bearer transfer information sent by the core network.
5. The handover method of claim 4, wherein the method further comprises:
and after receiving the response information sent by the first network side device, the second network side device sends a bearer release request to the core network.
6. The handover method according to any one of claims 1 to 5, wherein the first network-side device is a base station, and the second network-side device is an access point; or, the first network side device is an access point, and the second network side device is a base station.
7. The handover method of claim 6, wherein the third network side device is a gateway.
8. The handover method according to claim 7, wherein the base station communicates with a gateway through an X2 interface and/or an S1 interface;
the base station and the access point communicate through an X2 interface.
9. An apparatus for handover between heterogeneous networks, the apparatus comprising:
the terminal comprises a receiving module, a switching module and a switching module, wherein the receiving module is used for receiving bearer switching request information sent by second network side equipment of a network where the terminal is located currently, and the bearer switching request information is sent by the second network side equipment when determining that part or all of bearers of the terminal need to be switched;
the judging module is used for judging whether the bearing needing to be switched of the terminal can be accepted or not according to the bearing switching request information;
a sending module, configured to return bearer admission information to the second network-side device when it is determined to admit a bearer that needs to be switched of the terminal;
and the transmission module is used for establishing connection with the terminal and transmitting data with the terminal.
10. The switching device of claim 9, wherein the receiving module is specifically configured to:
directly receiving bearer switching request information sent by the second network side equipment; or,
receiving bearer switching request information sent by a third network side device, wherein the bearer switching request information is sent to the third network side device by the second network side device.
11. The switching device of claim 9, wherein the sending module is specifically configured to:
directly returning the bearing admission information to the second network side equipment; or,
and returning the bearing admission information to the second network side equipment through the third network side equipment.
12. The switching device of claim 9, wherein the sending module is further configured to:
directly returning response information for indicating that the terminal is successfully accessed to the device to the second network side equipment, sending a bearing transfer request to a core network, and receiving bearing transfer information sent by the core network; or,
and returning response information for indicating that the terminal is successfully accessed to the device to the second network side equipment through third network side equipment, sending a bearing transfer request to a core network, and receiving the bearing transfer information sent by the core network.
13. The switching device according to any one of claims 10 to 12, wherein the third network-side device is a gateway.
14. A network side device, wherein the network side device comprises:
the receiving module is used for receiving bearer switching request information sent by second network side equipment of a network where a terminal is located currently, and receiving bearer admission information returned by first network side equipment of a network to be switched of the terminal, wherein the bearer switching request information is sent by the second network side equipment when determining that part or all of bearers of the terminal need to be switched;
a sending module, configured to send the bearer switching request message to the first network side device, inquire whether the first network side device accepts a bearer that needs to be switched of the terminal, and return the received bearer acceptance message to the second network side device.
15. The network-side device of claim 14, wherein the receiving module is further configured to:
receiving response information which is sent by the first network side equipment and used for indicating that the terminal is successfully accessed to the first network side equipment;
the sending module is further configured to:
and sending the response information to the second network side equipment.
16. A system for handover between heterogeneous networks, the system comprising:
the second network side equipment is used for sending the bearing switching request information to the first network side equipment when determining that part or all of the bearing of the terminal needs to be switched; receiving the bearer admission information returned by the first network side equipment;
the first network side equipment is used for receiving the bearer switching request information and judging whether the first network side equipment can accept the bearer of the terminal according to the bearer switching request information; when determining to admit the bearer of the terminal, returning bearer admission information to the second network side equipment; establishing connection with the terminal, and performing data transmission with the terminal;
and the terminal is used for establishing connection with the first network side equipment and carrying out data transmission with the first network side equipment.
17. The system of claim 16, wherein the system further comprises:
and the third network side device is used for receiving the bearer switching request information sent by the second network side device and sending the bearer switching request information to the first network side device.
18. The system of claim 17, wherein the third network-side device is further configured to:
and receiving the bearer admission information returned by the first network side equipment, and sending the bearer admission information to the second network side equipment.
19. The system of claim 16, wherein the first network-side device is further configured to:
returning response information for indicating that the terminal is successfully accessed to the first network side equipment to second network side equipment, sending a bearing transfer request to core network equipment, and receiving bearing transfer information sent by the core network equipment;
the system further comprises:
and the core network device is used for receiving the bearer transfer request sent by the first network side device, transferring the bearer of the terminal needing to be switched, and returning bearer transfer information to the first network side device.
20. The system of claim 19, wherein the second network-side device is further configured to:
receiving response information which is sent by the first network side equipment and used for indicating that the terminal is successfully accessed to the first network side equipment, and sending a bearer release request to the core network equipment;
the core network device is further configured to:
and receiving a bearer transfer request sent by the first network side equipment, transferring the bearer of the terminal which needs to be switched, and returning bearer transfer information to the first network side equipment.
21. The system of claim 18, wherein the system further comprises:
and the third network side device is used for receiving response information which is sent by the first network side device and used for indicating the terminal to successfully access the first network side device, and sending the response information to the second network side device.
22. The system according to any one of claims 16 to 21, wherein the first network-side device is a base station and the second network-side device is an access point; or, the first network side device is an access point, and the second network side device is a base station.
23. The system according to any one of claims 16 to 21, wherein the third network-side device is a gateway.
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| CN201310045931.9A CN103974358A (en) | 2013-02-05 | 2013-02-05 | Switching method, switching device and switching system for heterogeneous networks |
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| CN117651270A (en) * | 2024-01-30 | 2024-03-05 | 中兴通讯股份有限公司 | Roaming processing method, device and storage medium |
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| CN102695234A (en) * | 2011-03-25 | 2012-09-26 | 中兴通讯股份有限公司 | Service bearing transfer method and apparatus thereof |
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| CN102695234A (en) * | 2011-03-25 | 2012-09-26 | 中兴通讯股份有限公司 | Service bearing transfer method and apparatus thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017206629A1 (en) * | 2016-05-31 | 2017-12-07 | 华为技术有限公司 | Method and device for network access |
| CN107454646A (en) * | 2016-05-31 | 2017-12-08 | 华为技术有限公司 | A kind of method for network access and device |
| CN117651270A (en) * | 2024-01-30 | 2024-03-05 | 中兴通讯股份有限公司 | Roaming processing method, device and storage medium |
| CN117651270B (en) * | 2024-01-30 | 2024-05-07 | 中兴通讯股份有限公司 | Roaming processing method, device and storage medium |
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