CN107295590B - Base station and method for switching LTE network to WLAN network - Google Patents

Base station and method for switching LTE network to WLAN network Download PDF

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Publication number
CN107295590B
CN107295590B CN201610200754.0A CN201610200754A CN107295590B CN 107295590 B CN107295590 B CN 107295590B CN 201610200754 A CN201610200754 A CN 201610200754A CN 107295590 B CN107295590 B CN 107295590B
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user equipment
wlan network
wlan
network
access bearer
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CN107295590A (en
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邓云
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method for switching a base station and an LTE network to a WLAN network comprises the following steps: when an LTE network establishes a wireless access bearer for user equipment, acquiring information whether the established wireless access bearer sent by a mobility management entity allows switching to a WLAN network; and when the user equipment is determined to be allowed to be switched to the WLAN, preferentially selecting downlink data of a radio access bearer allowed to be switched to the WLAN for scheduling and transmitting the downlink data to the user equipment. According to the scheme, during the process that the UE is switched from the LTE to the WLAN, the loss of downlink data can be reduced, and the reliability of data transmission is improved.

Description

Base station and method for switching LTE network to WLAN network
Technical Field
The invention relates to the technical field of communication, in particular to a base station and a method for switching an LTE network to a WLAN network.
Background
A Long Term Evolution (LTE) network and a Wireless Local Area Network (WLAN) network convergence (LTE-WLAN Aggregation, LWA), which is that a base station configures a user equipment (UE Termination, abbreviated as UE) in a radio resource control connection state to simultaneously use radio resources of LTE and WLAN for data transmission, and at this time, the user equipment maintains RRC connection with the base station in LTE, and a non-access stratum (NAS) signaling of the user equipment is transmitted by the base station (an uplink non-access stratum signaling is sent by the base station to a core network, and a downlink non-access stratum signaling is sent by the base station to the user equipment).
In LTE and WLAN convergence, a Packet Data Convergence Protocol (PDCP) data Packet of each bearer is generated by a PDCP entity located in a base station, and is transmitted to a user equipment through a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a physical layer of LTE or through a WLAN.
In the prior art, a UE establishes one or more Public Data Network (PDN) connections through an LTE system access network, and when discovering an accessible WLAN access network, the UE may switch some or all of the established PDN connections to the WLAN network.
In general, the UE may select a WLAN network that may be accessed according to network selection criteria and switch some or all of the established PDN connections to the WLAN network. In 3GPP Release13 (Release13), signaling is introduced to trigger the UE to switch to the WLAN network by the base station, and the base station may obtain load information of the WLAN through a backhaul link with the WLAN network and determine whether to trigger the UE to switch to the WLAN through information such as WLAN network signal strength measured by the UE.
However, during the process of switching the UE from LTE to WLAN, downlink data may be lost, which may affect user experience.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to reduce the loss of downlink data and improve the reliability of data transmission in the process of switching the UE from the LTE to the WLAN.
In order to solve the above problem, an embodiment of the present invention provides a method for switching an LTE network to a WLAN network, where the method includes: when an LTE network establishes a wireless access bearer for user equipment, acquiring information whether the established wireless access bearer sent by a mobility management entity allows switching to a WLAN network; and when the user equipment is determined to be allowed to be switched to the WLAN, preferentially selecting downlink data of a radio access bearer allowed to be switched to the WLAN for scheduling, and transmitting the downlink data to the user equipment.
Optionally, the determining whether the user equipment allows handover to a WLAN network includes:
and the base station determines whether the user equipment allows to be switched to the WLAN network or not through the measurement report of the WLAN network reported by the user equipment.
Optionally, the base station determines whether the user equipment is allowed to switch to the WLAN network through a measurement report of the WLAN network reported by the user equipment and a load state of the WLAN network.
Optionally, the method further comprises:
and when determining that the radio access bearer established by the user equipment is not allowed to be switched to the WLAN, sending indication information to the user equipment so as to enable the user equipment to stop measuring the accessible WLAN.
Optionally, the obtaining information of whether the established radio access bearer sent by the mobility management entity allows handover to the WLAN network includes:
and sending initial context establishment request information or wireless access bearer establishment request information through the mobility management entity to acquire information whether the established wireless access bearer allows switching to the WLAN network.
Optionally, the method further comprises: and when determining that the radio access bearer established for the user equipment cannot be switched to the WLAN, sending indication information to the user equipment to indicate the user equipment to stop measuring the detected WLAN.
An embodiment of the present invention further provides a base station, where the base station includes: the device comprises an acquisition unit, a sending unit and a switching unit, wherein the acquisition unit is suitable for acquiring information whether the established radio access bearer sent by a mobility management entity allows switching to a WLAN (wireless local area network) network when the LTE network establishes the radio access bearer for user equipment; and the scheduling unit is suitable for preferentially selecting downlink data of a radio access bearer which is allowed to be switched to the WLAN network for scheduling when the user equipment is determined to be allowed to be switched to the WLAN network, and transmitting the downlink data to the user equipment.
Optionally, the base station further includes: and the switching judgment unit is suitable for determining whether the user equipment allows to switch to the WLAN through the measurement report of the WLAN reported by the user equipment.
Optionally, the handover determining unit is adapted to determine whether the user equipment is allowed to handover to the WLAN network according to a measurement report of the WLAN network reported by the user equipment and a load state of the WLAN network.
Optionally, the base station further includes:
the first sending unit is adapted to send indication information to the user equipment when it is determined that none of the radio access bearers established by the user equipment can be switched to the WLAN network, so that the user equipment stops measuring accessible WLAN networks.
Optionally, the obtaining unit is adapted to send, by the mobility management entity, initial context establishment request information or radio access bearer establishment request information, and obtain information on whether the established radio access bearer allows handover to the WLAN network.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the scheme, when the base station determines that the UE is allowed to be switched from the LTE network to the WLAN network, the base station preferentially schedules the downlink data of the wireless access bearer allowed to be switched to the WLAN network and transmits the downlink data to the user equipment, so that the loss of the data when the user equipment is switched from the LTE network to the WLAN network can be reduced, and the reliability of data transmission is improved.
Further, when the base station determines that the LTE network establishes the radio access bearer for the UE and all the radio access bearers are not allowed to be switched to the WLAN network, the UE is prohibited from measuring the accessible WLAN network, so as to reduce signaling interaction and power consumption of the UE, thereby saving resources.
Drawings
Fig. 1 is a flowchart of a method for switching an LTE network to a WLAN network in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a base station in the embodiment of the present invention.
Detailed Description
In the prior art, when a UE establishes one or more PDN connections through an LTE system access Public Data Network (PDN), if an accessible WLAN access Network is detected, some or all established PDN connections may be switched to the WLAN Network.
In general, the UE may select a WLAN network that may be accessed according to network selection criteria and switch some or all of the established PDN connections to the WLAN network. In 3GPP Release13, signaling is introduced that triggers the handover of the UE to the WLAN network. The base station may configure, for the UE, relevant measurement of the WLAN network, so that the UE measures the nearby WLAN network and reports the WLAN network meeting the reporting condition to the base station. The base station makes a decision whether to allow the UE to handover through a WLAN measurement report reported by the UE and possibly load information of the WLAN network obtained through a backhaul link (backhaul) with the WLAN and link state information between the WLAN access network and the core network.
However, since it is not known which PDN connections the UE has established can be switched to the WLAN network, after the base station makes a decision to switch the UE to the WLAN network, the base station may store data that is not available for transmission of part of the downlink data of the PDN connection, and after the UE switches to the WLAN network, the data will be lost.
In order to solve the above problems in the prior art, in the technical scheme adopted in the embodiment of the present invention, when the base station determines that the UE is allowed to switch from the LTE network to the WLAN network, the base station preferentially selects the downlink data of the radio access bearer allowed to be switched to the WLAN network for scheduling, and transmits the downlink data to the user equipment, so that the data loss of the user equipment during switching from the LTE network to the WLAN network can be reduced, and the reliability of data transmission can be improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 shows a flowchart of a method for switching between an LTE network and a WLAN network in an embodiment of the present invention. As shown in fig. 1, in a specific implementation, the method for switching between the LTE network and the WLAN network may be implemented by the following procedures:
step S101: when the LTE network establishes the wireless access bearer for the user equipment, the information whether the established wireless access bearer sent by the mobility management entity allows to be switched to the WLAN network is obtained.
In a specific implementation, after the UE accesses the LTE network, the LTE network may configure one or more PDN connections for the UE according to service requirements of the UE, where each PDN connection may further include one or more different Evolved Radio Access bearers (E-RABs). When the LTE network establishes a PDN connection for the UE, a Mobility Management Entity (MME) may notify the UE through Non-access stratum (NAS) signaling whether the established PDN connection can be switched to the WLAN network. However, the base station to which the UE has access cannot know whether the E-RAB in the PDN connection established for the UE allows handover to the WLAN network.
Therefore, in an embodiment of the present invention, when the LTE network establishes the E-RAB for the UE, the MME may notify the base station of information on whether the established E-RAB allows handover to the WLAN network, so that the base station may know which E-RABs in the PDN connection established for the UE allow handover to the WLAN network.
In a specific implementation, the information about whether the radio access bearer established by the MME for the UE allows handover to the WLAN network may be signaled to the base station through the S1 interface. For example, the MME may transmit information to the base station through an initial context setup request signaling when the UE accesses the LTE network, or through an E-RAB setup request signaling when the UE establishes the E-RAB after accessing the LTE network, whether the established E-RAB allows handover to the WLAN network.
Step S102: when the accessible WLAN network is detected and the user equipment is determined to be allowed to switch to the WLAN network, downlink data of a radio access bearer allowed to switch to the WLAN network is preferentially selected to be scheduled and transmitted to the user equipment.
In specific implementation, when the UE and the base station are in a connected state, and the base station can determine that the UE is close to the accessible WLAN network through the location information (the location of the UE and the deployment location information of the WLAN), the base station configures the UE to measure the adjacent WLAN network, and the UE measures the detected WLAN network, and adds the information of the WLAN network meeting the reporting condition to a WLAN network measurement report and reports the information to the base station. The base station may determine whether the UE may be handed over to the WLAN network (it needs to be ensured that the UE can continue to conduct the current service after being handed over to the WLAN) based on the received WLAN network measurement report or the load information of the WLAN network acquired through the backhaul link.
In 3GPP release13, when the base station determines that the UE allows to switch to the WLAN network (it needs to ensure that the UE can continue to perform the current service after switching to the WLAN), the E-RAB of the UE, which allows to switch to the WLAN network in the PDN connection in the LTE network, will switch to the WLAN network, and transmit downlink data to the UE through the WLAN network.
However, some data of the downlink data of the E-RAB allowed to be switched to the WLAN network in the PDN connection established by the UE is not buffered in the base station and is not ready to be transmitted to the UE. Therefore, in order to avoid the loss of the part of the downlink data as much as possible, when determining that the UE is allowed to switch to the WLAN network, the base station may select the downlink data of the E-RAB allowed to switch to the WLAN network in the PDN connection established by the UE to be transmitted to the UE first, so as to avoid the loss of the part of the downlink data cached in the base station when the UE switches to the WLAN network.
And for the E-RAB which is not allowed to be switched to the WLAN network, the downlink data of the E-RAB which is cached in the base station and is not allowed to be switched to the WLAN network cannot be lost because the E-RAB continues to send downlink data to the UE through the base station. Therefore, the priority of the downlink data scheduling of the E-RAB which is not allowed to be switched to the WLAN network in the PDN connection established by the UE can be temporarily reduced, and the priority of the downlink data scheduling of the E-RAB which is allowed to be switched to the WLAN network is increased, so that the downlink data of the E-RAB which is allowed to be switched to the WLAN network is preferentially transmitted. After the UE switches the E-RAB allowed to switch to the WLAN network, the base station may restore the scheduling priority of the E-RAB not allowed to switch to the WLAN network in the PDN connection established by the UE.
It should be noted that the PDN connection established for the UE may include more than one E-RAB, and there may be situations where some E-RABs allow handover to the WLAN network and other E-RABs do not allow handover to the WLAN network in the same PDN connection. Therefore, in this embodiment, the base station does not adjust the transmission of the downlink data with the PDN connection as the granularity, but performs scheduling of the transmission of the downlink data with the E-RAB as the granularity, which can further reduce the data loss compared with the PDN connection as the granularity.
In the specific implementation, the above embodiments can be further expanded according to the needs. In an embodiment of the present invention, when the base station receives that all E-RABs in all PDN connections established for the UE and sent by the MME are not allowed to be switched to the WLAN, in order to avoid the UE measuring the detected WLAN network to save signaling consumption and power loss of the UE, the base station may further include the following step in a process of switching the user equipment from the LTE network to the WLAN network:
step S103: and when determining that the radio access bearer established by the user equipment is not allowed to be switched to the WLAN, sending indication information to the user equipment so as to enable the user equipment to stop measuring the WLAN.
The device corresponding to the method for switching from the LTE network to the WLAN network in the above embodiment will be described in further detail below.
Fig. 2 shows a schematic structural diagram of a base station in the embodiment of the present invention. As shown in fig. 2, in a specific implementation, a base station 200 in the embodiment of the present invention may include an obtaining unit 201 and a scheduling unit 202, where:
the obtaining unit 201 is adapted to, when the LTE network establishes a radio access bearer for the user equipment, obtain information whether the established radio access bearer sent by the mobility management entity allows handover to the WLAN network.
In a specific implementation, the obtaining unit 201 is adapted to send initial context establishment request information or radio access bearer establishment request information through the mobility management entity, and obtain information whether the established radio access bearer can be switched to the WLAN network.
The scheduling unit 202 is adapted to preferentially select downlink data of a radio access bearer that is allowed to be switched to the WLAN network for scheduling and transmitting the downlink data to the user equipment when it is determined that the user equipment is allowed to be switched to the WLAN network.
In a specific implementation, the base station 200 may further include a handover determining unit 203, where:
the handover determining unit 203 determines whether the ue can handover to the WLAN network according to the measurement report of the WLAN network reported by the ue.
In another embodiment of the present invention, the handover determining unit 203 is adapted to determine whether the ue is allowed to handover to the WLAN network according to a measurement report of the WLAN network reported by the ue and a load status of the WLAN network.
In a specific implementation, the base station 200 may further include a first sending unit 204, where:
a first sending unit 204, adapted to send indication information to the user equipment when it is determined that none of the radio access bearers established by the user equipment can be switched to the WLAN network, so that the user equipment stops measuring the WLAN network.
By adopting the scheme, when the base station determines that the UE can be switched from the LTE network to the WLAN network, the base station preferentially selects the downlink data of the wireless access bearer which can be switched to the WLAN network to be transmitted to the user equipment, so that the loss of the data when the user equipment is switched from the LTE network to the WLAN network can be reduced, and the reliability of data transmission is improved.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructions associated with hardware via a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The method and system of the embodiments of the present invention have been described in detail, but the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A method for switching an LTE network to a WLAN network is characterized by comprising the following steps:
when an LTE network establishes a wireless access bearer for user equipment, acquiring information whether the established wireless access bearer sent by a mobility management entity allows switching to a WLAN network;
and when the user equipment is determined to be allowed to be switched to the WLAN, preferentially selecting downlink data of a radio access bearer allowed to be switched to the WLAN for scheduling and transmitting the downlink data to the user equipment.
2. The method of claim 1, wherein the determining that the user equipment is allowed to handover to the WLAN network comprises:
and the base station determines whether the user equipment allows to be switched to the WLAN network or not through the measurement report of the WLAN network reported by the user equipment.
3. The method of claim 2, wherein the determining whether the user equipment allows handover to the WLAN network comprises: and the base station determines whether the user equipment is allowed to be switched to the WLAN network or not according to the measurement report of the WLAN network reported by the user equipment and the load state of the WLAN network.
4. The method for switching the LTE network to the WLAN network according to claim 1, further comprising:
and when determining that the radio access bearer established by the user equipment is not allowed to the WLAN, sending indication information to the user equipment so that the user equipment stops measuring the accessible WLAN.
5. The method of claim 1, wherein the obtaining information whether the established radio access bearer sent by the mobility management entity allows handover to the WLAN network comprises:
and sending initial context establishment request information or wireless access bearer establishment request information through the mobility management entity to acquire information whether the established wireless access bearer allows switching to the WLAN network.
6. A base station, comprising:
the device comprises an acquisition unit, a sending unit and a switching unit, wherein the acquisition unit is suitable for acquiring information whether the established radio access bearer sent by a mobility management entity allows switching to a WLAN (wireless local area network) network when the LTE network establishes the radio access bearer for user equipment;
and the scheduling unit is suitable for preferentially selecting downlink data of a radio access bearer which is allowed to be switched to the WLAN network for scheduling when the user equipment is determined to be allowed to be switched to the WLAN network, and transmitting the downlink data to the user equipment.
7. The base station of claim 6, further comprising: and the switching judgment unit is suitable for determining whether the user equipment is allowed to be switched to the WLAN network or not according to the measurement report of the WLAN network reported by the user equipment and the load state of the WLAN network.
8. The base station of claim 7, wherein the handover determining unit is further adapted to determine whether the user equipment is allowed to handover to the WLAN network through a measurement report of the WLAN network reported by the user equipment and a load status of the WLAN network.
9. The base station of claim 6, further comprising:
the first sending unit is suitable for sending indication information to the user equipment when the fact that the wireless access bearer established by the user equipment cannot be switched to the WLAN network is determined, so that the user equipment stops measuring the accessible WLAN network.
10. The base station according to claim 6, wherein the obtaining unit is adapted to obtain information whether the established radio access bearer allows handover to the WLAN network by sending an initial context setup request message or a radio access bearer setup request message.
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US10708835B2 (en) * 2017-12-26 2020-07-07 At&T Intellecutual Property I, L.P. Control of wireless fidelity access for 5G or other next generation network
CN108174419B (en) * 2018-01-30 2020-02-14 北京邮电大学 Multi-standard wireless network efficient switching method based on software definition
CN110944287A (en) * 2019-12-08 2020-03-31 北京凌壹世纪科技有限公司 Mobile terminal-based public safety command information transmission method and public safety mobile command terminal
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