WO2017171470A1 - Procédé destiné à commander l'agrégation de réseau local sans fil et équipement associé - Google Patents

Procédé destiné à commander l'agrégation de réseau local sans fil et équipement associé Download PDF

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Publication number
WO2017171470A1
WO2017171470A1 PCT/KR2017/003552 KR2017003552W WO2017171470A1 WO 2017171470 A1 WO2017171470 A1 WO 2017171470A1 KR 2017003552 W KR2017003552 W KR 2017003552W WO 2017171470 A1 WO2017171470 A1 WO 2017171470A1
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WIPO (PCT)
Prior art keywords
wlan
information
aggregation
node
radio access
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PCT/KR2017/003552
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English (en)
Inventor
Xiaowan KE
Hong Wang
Lixiang Xu
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Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201610875793.0A external-priority patent/CN107277850B/zh
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to EP17775894.3A priority Critical patent/EP3424237B1/fr
Priority to US16/090,556 priority patent/US11558789B2/en
Priority to KR1020187028527A priority patent/KR102310861B1/ko
Priority to KR1020217031759A priority patent/KR102456336B1/ko
Priority to EP20201542.6A priority patent/EP3823353B1/fr
Publication of WO2017171470A1 publication Critical patent/WO2017171470A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • 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
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • 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
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0038—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of security context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to wireless communication technologies, and in particular to a method for controlling Wireless Local Area Network (WLAN) aggregation and an associated equipment.
  • WLAN Wireless Local Area Network
  • the 5G or pre-5G communication system is also called a 'Beyond 4G Network' or a 'Post LTE System'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs Cloud Radio Access Networks
  • D2D device-to-device
  • wireless backhaul moving network
  • cooperative communication Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like.
  • CoMP Coordinated Multi-Points
  • Hybrid FSK and QAM Modulation FQAM
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • FIG. 1 is a system architecture diagram of system architecture evolution (SAE), in which:
  • UE 101 is a terminal device supporting a network protocol
  • E-UTRAN evolved-universal terrestrial ratio access network
  • E-UTRAN evolved-universal terrestrial ratio access network
  • UE user equipment
  • E-UTRAN evolved-universal terrestrial ratio access network
  • MME mobility management entity
  • SGW serving gateway
  • PGW packet data gateway
  • PCRF policy and charging rule functional entity
  • serving GPRS support node (SGSN) 108 is a network node device which provides routing for transmission of data in a universal mobile communication system (UMTS); home subscriber server (HSS) 109
  • the WLAN aggregation is to establish a dual connection between an EUTRAN bearer and a WLAN bearer for a UE, and offload, by the WLAN, a part of or all of the data to be transmitted to the UE.
  • the control plane of the UE is still established between the UE and a base station, and the WLAN merely offloads the user plane data.
  • the base station controls the creation and deletion of aggregation on the WLAN side.
  • the WLAN aggregation performance of the UE in a handover process of a radio access network node is low.
  • the mechanism for offloading data for a UE by a WLAN node still have many problems, for example, high signaling overhead, poor data continuity, and impact on the transmission rate of the data during the handover.
  • the present invention provides a method for controlling WLAN aggregation and an associated equipment, in order to improve the WLAN aggregation performance in a UE mobility scenario.
  • a method for controlling Wireless Local Area Network (WLAN) aggregation comprising the following steps of:
  • the acquiring, by a first radio access network node, WLAN information about a UE comprises:
  • WLAN Termination WT
  • second radio access network node or a core network node, WLAN information about the UE.
  • the WLAN information about the UE at least comprises one or more of the following information:
  • information about a WT for WLAN aggregation for the UE an identifier of the UE, configuration information about the WLAN aggregation for the UE, WLAN measurement report information, information about WLAN node candidates for the WLAN aggregation for the UE, WLAN state information of the UE, an identifier of a serving Public Land Mobile Network (PLMN), information about a WLAN node currently associated with the UE, WLAN measurement configuration information, WLAN capability of the UE, WT-created UE context indication information, and indication of update WLAN aggregation security information.
  • PLMN Public Land Mobile Network
  • the information about a WT for WLAN aggregation for the UE comprises one or more of the following: an identifier of the WT, an address of the WT, and indication information about whether to maintain the WT;
  • the identifier of the UE contains one or more of the following: an identifier uniquely identifying a UE on an Xw interface in a radio access network node, an identifier uniquely identifying a UE on an Xw interface in a WT node;
  • the configuration information about the WLAN aggregation for the UE contains one or more of the following: a mobility set of the WLAN aggregation for the UE, security information for the WLAN aggregation, information about a bearer for the WLAN aggregation, and indication information about whether to change the mobility set of WLAN aggregations for the UE;
  • the WLAN capability of the UE contains one or more of the following: a frequency band or a carrier frequency of a WLAN supported by the UE;
  • the WLAN state information of the UE contains one or more of the following:
  • the WLAN measurement report information contains one or more of the following: a WLAN identifier of a WLAN node, a WLAN frequency band or a WLAN carrier frequency supported by the WLAN node, the channel quality of the WLAN node, an available admission capacity, an available backhaul network downlink bandwidth, an available backhaul network uplink bandwidth, a channel utilization ratio, the number of accessible terminals, a WLAN measurement report event, and indication information of whether there is a WLAN node satisfying the WLAN aggregation conditions for the UE;
  • the information about WLAN node candidates for the WLAN aggregation for the UE contains one or more of the following: a WLAN identifier of a WLAN node, a WLAN frequency band or a WLAN carrier frequency supported by the WLAN node, the channel quality of the WLAN node, an available admission capacity, an available backhaul network downlink bandwidth, an available backhaul network uplink bandwidth, a channel utilization ratio, the number of accessible terminals, a WLAN measurement report event, indication information of whether there is a WLAN node satisfying the WLAN aggregation conditions of the UE, and indication information of the absence of WLAN node candidates for the WLAN aggregation for the UE.
  • the mobility set of the WLAN aggregation for the UE is an identifier of a WLAN node allocated to the UE to perform WLAN aggregation;
  • the security information for the WLAN aggregation contains one or more of the following: a current WT counter for the WLAN aggregation, a key about the UE of the WT, and a key about the UE of the radio access network node;
  • the information about a bearer for the WLAN aggregation comprises one or more of the following: a bearer identifier, a quality parameter, a particular radio resource configuration, and a mapping result of a 3GPP quality parameter of a UE bearer and a quality parameter of the WLAN.
  • controlling WLAN aggregation for the UE comprises at least one of the following:
  • the determining, by the first radio access network node, a WT node for the WLAN aggregation for the UE according to the acquired WLAN information specifically comprises:
  • the mobility set of the WLAN aggregation is decided to be maintained
  • the mobility set of the WLAN aggregation is changed, but the changed mobility set of the WLAN aggregation is still within a management range of a source WT;
  • the WLAN node currently associated with the UE satisfies the requirements of the WLAN aggregation
  • the received WLAN state information of the UE is the connection of the UE to the WLAN is normal
  • the received WLAN state information of the UE is that the connection of the UE to the WLAN is abnormal, but the connection of the UE to the WLAN can be restored to a normal state by updating the mobility set of the WLAN aggregation for the UE.
  • the conditions for the decision specifically comprises at least one of the following: when the first radio access network node does not receive the WLAN measurement report information of the UE or the WLAN measurement report information of the UE is null; the information about WLAN node candidates for the WLAN aggregation for the UE is not received; and, when the information about WLAN node candidates for the WLAN aggregation for the UE is null;
  • the first radio access network node reuses more than one or more of the received configuration information about the WLAN aggregation for the UE to establish WLAN aggregation for the WT.
  • the first radio access network node decides not to establish WLAN aggregation for the UE when determining, according to the acquired WLAN information, that one or more of the following conditions are satisfied:
  • the indication information about whether to establish the WLAN aggregation for the UE is NO;
  • the received WLAN state information of the UE is the WLAN connection is abnormal
  • the UE selects a WLAN node that is not selected by the first radio access network node, but this WLAN node does not satisfy the requirements of a WLAN node.
  • a radio access network node comprising:
  • a receiving module configured to acquire WLAN information about a UE
  • a determination module configured to control WLAN aggregation for the UE according to the acquired WLAN information.
  • a method for controlling WLAN aggregation comprising the following steps of:
  • the transmitting, by the second radio access network node, information about whether to maintain the WT and/or indication information about whether to establish WLAN aggregation for the UE comprises:
  • the deciding, by a second radio access network node, whether to maintain a WT comprises:
  • a mobility set of the WLAN aggregation is decided not to be changed
  • the mobility set of the WLAN aggregation is to be changed, but the changed mobility set of the WLAN aggregation is still within a management range of a source WT;
  • the WLAN state of the UE is normal.
  • the deciding, by the second radio access network node, that the mobility set of the WLAN aggregation is not required to be changed comprises: determining, by the second radio access network node, to maintain the mobility set of the WLAN aggregation for the UE when one or more of the following are satisfied:
  • the WLAN state of the UE is normal.
  • the not occurring an event of changing the mobility set of the WLAN aggregation for the UE comprises one or two of the following:
  • the current mobility set of the WLAN aggregation is still within a validity period.
  • the information about maintaining the WT comprises one or more of the following information:
  • indication information of maintaining the WT information about the WT for the WLAN aggregation for the UE, an identifier of the UE, configuration information about the WLAN aggregation for the UE, WLAN state information of the UE, an identifier of a serving PLMN, information about a WLAN node currently associated with the UE, WLAN measurement configuration information, and the WLAN capability of the UE;
  • the configuration information about the WLAN aggregation for the UE is configuration information about the WLAN aggregation for the UE, which is updated by the second radio access network node.
  • the method further comprises:
  • the received WLAN state information of the UE is the WLAN connection is abnormal
  • the UE selects a WLAN node that is not selected by the second radio access network node, but this WLAN node does not satisfy the requirements of a WLAN node.
  • the method further comprises:
  • the WLAN state of the UE is abnormal but the abnormal WLAN state can be solved by updating the WLAN mobility set of the UE;
  • the WLAN state of the UE is abnormal, and the WLAN node currently associated with the UE satisfies the requirements of the WLAN aggregation;
  • the received WLAN state information of the UE is the connection of the UE to the WLAN is normal
  • the received WLAN state information of the UE is that the connection of the UE to the WLAN is abnormal, but the connection of the UE to the WLAN can be restored to a normal state by updating the mobility set of the WLAN aggregation for the UE;
  • the existing mobility set of the WLAN aggregation for the UE is not to be updated
  • the existing mobility set of the WLAN aggregation for the UE is to be updated and there is a WLAN node candidate for the WLAN aggregation for the UE.
  • a radio access network node comprising:
  • a module configured to decide whether to maintain a WT and/or whether to establish WLAN aggregation for a UE when the UE moves to a first radio access network
  • a module configured to transmit information about whether to maintain the WT and/or indication information about whether to establish the WLAN aggregation for the UE.
  • a method for controlling WLAN aggregation comprising the following steps of:
  • the UE context reference information comprises: a UE identifier, and indication information of maintaining a UE context in the WT.
  • the indexing, by the WT, a UE context according to the received UE context reference information comprises:
  • the method further comprises:
  • a wireless local area network termination comprising:
  • a module configured to receive UE context reference information transmitted by a first radio access network node
  • a module configured to index a UE context according to the received UE context reference information.
  • a method for controlling WLAN aggregation comprising the following steps of:
  • the WLAN aggregation release information can comprise at least one of the following: indication information of maintaining a UE context in the WT, indication information of maintaining a connection to a UE between the WT and a radio access network node, and indication information of stopping transmitting downlink data to a UE.
  • a method for controlling WLAN aggregation comprising the following steps of:
  • the pre-defined conditions comprise at least one of the following: receipt of indication information of maintaining a UE context in a WT, aware of handover start, receipt of handover request acknowledge, aware of handover completion, and receipt of a UE context release request.
  • WLAN information about a UE can be acquired by the interoperation of a radio access network and a WT, and the process of establishing WLAN aggregation is optimized in a UE mobility scenario, so that the signaling overhead is reduced, and the continuity of data and the high data transmission rate are maintained. Accordingly, the WLAN aggregation performance in the UE mobility scenario is enhanced, and the user experience is further improved.
  • the method for controlling WLAN aggregation provided by the present invention can improve the WLAN aggregation performance
  • the method provided by the present invention can also be called a method for enhancing WLAN aggregation mobility.
  • Fig. 1 is a schematic diagram of an EPS architecture according to the present invention
  • Fig. 2 is a schematic diagram of an interface between a base station and a WLAN according to the present invention
  • Fig. 3 is a schematic flowchart of a first method for enhancing WLAN aggregation mobility according to the present invention
  • Fig. 4 is a schematic flowchart of a second method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 5 is a schematic flowchart of a third method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 6 is a schematic flowchart of a fourth method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 7 is a schematic flowchart of Embodiment 1 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 8 is a schematic flowchart of Embodiment 2 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 9 is a schematic flowchart of Embodiment 3 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 10 is a schematic flowchart of Embodiment 4 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 11 is a schematic flowchart of Embodiment 5 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 12 is a schematic flowchart of Embodiment 6 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 13 is a schematic flowchart of a fifth method for enhancing WLAN aggregation mobility according to the present invention.
  • Fig. 14 is a schematic flowchart of a sixth method for enhancing WLAN aggregation mobility according to the present invention.
  • the WLAN aggregation is to establish a dual connection between an E-UTRAN bearer and a WLAN bearer for a UE, and offload, by the WLAN, a part of or all of the data to be transmitted to the UE.
  • the control plane of the UE is still established between the UE and a base station, and the WLAN merely offloads the user plane data.
  • the base station controls the creation and deletion of aggregation on the WLAN side.
  • the association of a UE with a WLAN node is to establish a connection between the UE and the WLAN node so that the two can exchange data.
  • the re-association of a UE and a WLAN node is to switch the association of the UE with a WLAN node to another WLAN node. After the UE re-associating to another WLAN node, the continuity is still maintained.
  • WLAN nodes available for re-association generally belong to a same Extended Service Area (ESS), an HESS or a same management range.
  • the WLAN aggregation mentioned herein can be aggregation of a radio access network and a WLAN in the 3GPP, for example, aggregation of an LTE and a WLAN, and aggregation of a radio access network and a WLAN in 5G radio access network.
  • an interface between a base station and the WLAN side is an Xw interface
  • the opposite side of the Xw interface for the base station is a WLAN Termination (WT).
  • the WT can be regarded as a proxy on the WLAN side, and the impact on the WLAN side can be shielded by the WT.
  • the WT can manage one or more WLAN entities, and each of the WLAN entities can be an AP, an AC, a BSS, an ESS, an HESS or other physical equipments.
  • the WT can be an independent node, or the WT can also be combined with an AP, an AC or other WLAN entities.
  • a source radio access network node releases the aggregation for the UE to the WT before the handover.
  • the target access network node reselects a WT to establish WLAN aggregation for the UE according to the requirements of WLAN aggregation.
  • the UE has no WLAN aggregation for the UE in the source radio access network node.
  • a WLAN measurement event satisfying WLAN aggregation conditions also occurs exactly.
  • the UE since there is no WLAN measurement information about the UE in the target radio access network node, when the UE is handed over to the target radio access network, the UE will not report WLAN measurement if the UE always stays in the measured WLAN node.
  • the target radio access network node will consider that the UE has no WLAN node satisfying the WLAN aggregation. Thus, the UE loses an opportunity of establishing WLAN aggregation and an opportunity of improving the throughput.
  • a target WT selected by the target radio access network node is a source WT released by the source radio access network node
  • the WT is released unnecessarily, and as a result, the signaling resources are wasted; while with regard to the UE, the transmission of data for the WLAN aggregation is interrupted, and as a result, the data rate of the UE is influenced and the user experience is influenced.
  • the target access network node is very likely to still select the released source WT as a serving WT of the UE.
  • Case 1 The mobility set of the WLAN node currently accessed by the UE or the WLAN node configured for the WLAN aggregation for the UE is not to be changed.
  • Case 2 The mobility set of the WLAN node configured for the WLAN aggregation for the UE is required to be changed, but the changed mobility set of the WLAN node configured for the WLAN aggregation for the UE is still within the management range of the source WT.
  • the target radio access network node is unable to decide whether the WLAN aggregation can be immediately established for the UE in the current WLAN state of the UE.
  • the target radio access network node is unable to judge whether the WLAN node accessed by the UE is required to be changed and whether the changed WLAN node is still within the management range of the original WT.
  • a WLAN measurement event may not occur when a handover event occurs, there is no WLAN measurement report.
  • the source radio access network may not store the historical WLAN measurement reports before handover.
  • the WLAN state may change. For example, the UE closes the WLAN or the connection of the UE to the WLAN fails.
  • the target radio access network does not know the WLAN capability of the UE and the supported band, the target radio access network does not know how to select the mobility set of the WLAN node for the WLAN aggregation for the UE.
  • the target radio access network node receives a handover request from the source radio access network node, it is unable to acquire a UE context from the UE side, for example, the identifier of the UE on the WLAN side; and, when the UE accesses a WLAN node, the WT does not know whether the association is successful.
  • Case 3 During the handover, it is needed to update the security context between the UE and the base station, so the data transmission will be interrupted; and if it is able to continue to perform transmission between the UE and the WT, the throughput of the UE can be maintained during the handover. However, it is still unclear about how to support data transmission between the UE and the WT.
  • Fig. 3 is a schematic flowchart of a first method for enhancing WLAN aggregation mobility according to the present invention. This method comprises the following steps.
  • Step 301 By a first radio access network node, WLAN information about a UE is acquired.
  • the first radio access network node acquires, from the UE, a WT, a second radio access network or a core network node, WLAN information about the UE.
  • the WLAN information about the UE at least comprises one or more of the following information:
  • information about a WT for WLAN aggregation for the UE an identifier of the UE, configuration information about the WLAN aggregation for the UE, WLAN measurement report information, information about WLAN node candidates for the WLAN aggregation for the UE, WLAN state information of the UE, an identifier of a serving Public Land Mobile Network (PLMN), information about a WLAN node currently associated with the UE, WLAN measurement configuration information, WLAN capability of the UE, indication information about whether to create the WLAN aggregation for the UE, WT-created UE context indication information, and indication of update WLAN aggregation security information.
  • PLMN Public Land Mobile Network
  • the information about a WT for WLAN aggregation for the UE comprises one or more of the following information:
  • the information about a WT for WLAN aggregation for the UE is used by the first radio access network node to associate a source WT.
  • the first radio access network node can also associate a source WT.
  • the source WT is the WT currently establishing the WLAN aggregation for the UE.
  • the UE identifier comprises one or more of the following:
  • an identifier uniquely identifying a UE on an Xw interface in a radio access network node e.g., eNB UE XWAP ID
  • an identifier uniquely identifying a UE on an Xw interface in a WT node e.g., WT UE XWAP ID
  • an identifier uniquely identifying a UE in a WLAN e.g., the WLAN MAC address of the UE.
  • the WLAN address of the UE is used by the WT to know whether the UE has successfully associated to a WLAN node under the WT.
  • the WT UE XWAP ID is an identifier assigned to the UE by the WT when the second radio access network node and the WT establish WLAN aggregation for the UE. Through the identifier of the UE, it is able to know whether there is a UE context in the WT.
  • the configuration information about the WLAN aggregation for the UE comprises one or more of the following: a mobility set of the WLAN aggregation for the UE (e.g., a set of WLAN nodes), security information for the WLAN aggregation, information about a bearer for the WLAN aggregation, and indication information about whether to change the mobility set of the WLAN aggregation for the UE.
  • a mobility set of the WLAN aggregation for the UE e.g., a set of WLAN nodes
  • security information for the WLAN aggregation e.g., a set of WLAN nodes
  • information about a bearer for the WLAN aggregation e.g., a bearer for the WLAN aggregation
  • indication information about whether to change the mobility set of the WLAN aggregation for the UE e.g., whether to change the mobility set of the WLAN aggregation for the UE.
  • the mobility set of the WLAN aggregation for the UE refers to WLAN nodes configured for the UE for performing the WLAN aggregation, and it is unnecessary to inform the base station when the UE moves among these configured WLAN nodes.
  • the mobility set of the WLAN aggregation for the UE at least comprises one or more of the following: a group of WLAN identifiers, a group of deleted WLAN identifier, and a group of added WLAN identifiers.
  • the WLAN identifier is an identifier of a WLAN node; and in some implementations, the WLAN identifier at least contains one of the following contents: an SSID, a BSSID and an HESSID.
  • the WLAN node refers to an AP, an AC, a WT, a BSS, an ESS, an HESS or other WLAN nodes or units.
  • the first radio access network node when the first radio access network node receives the mobility set of the WLAN aggregation for the UE, it is indicated that the mobility set of the WLAN aggregation for the UE can be maintained or the mobility set of the WLAN aggregation for the UE is required not to be changed.
  • the first radio access network node when the first radio access network node receives an indication of being not required to change the mobility set of the WLAN aggregation for the UE, the first radio access network node reuses the WLAN aggregation for the UE which is established when receiving the mobility set of the UE.
  • the first radio access network node when the first radio access network node receives an indication of being required to change the mobility set of the WLAN aggregation for the UE, the first radio access network node can select a mobility set of the WLAN aggregation for the UE according to the received WLAN measured report information or the received list of WLAN node candidates for the WLAN aggregation for the UE; and, if the selected mobility set of the WLAN aggregation is already not within the management range of the source WT, the second radio access network node is indicated to not reserve the UE context, and the second radio access network node releases the UE context in the source WT.
  • the information about a bearer for the WLAN aggregation is information of a bearer offloaded to WLAN, and comprises one or more of the following:
  • a bearer identifier e.g., an identifier of an ERAB and/or an identifier of a DRB
  • a quality parameter e.g., QCI, GBR, MBR, ARP or more
  • a particular radio resource configuration e.g., a mapping result of a 3GPP quality parameter of a UE bearer and a quality parameter of the WLAN (e.g., access category or user priority).
  • the UE can bear uplink data transmission of a WLAN aggregation bearer decided by the mapped access category.
  • different access categories have different back-off times during a resource collision.
  • the security information for the WLAN aggregation contains one or more of the following: a current WT counter for the WLAN aggregation (e.g., lwa-WT-Counter), a key about the UE of the WT (e.g., S-K WT ), and a key about the UE of the radio access network node (e.g., K eNB ).
  • the radio access network node decides a key (e.g., S-K WT ) for WT to encrypt and offload data, according to the K eNB and lwa-WT-Counter.
  • the WLAN capability of the UE contains one or more of the following: a frequency band (e.g., band) or a carrier frequency (e.g., carrier) of a WLAN supported by the UE.
  • the frequency band or carrier frequency of the WLAN is manifested as one or more of the following: an operating class, a country code and a channel number.
  • the WLAN state information of the UE contains one or more of the following:
  • a WLAN identifier of a user's preferred WLAN node (the WLAN identifier is as described above and will not be repeated here), information about normal connection of the UE to the WLAN, and information about abnormal connection of the UE to the WLAN.
  • the information about normal WLAN connection can further contain one or more of the following: information about WLAN connection success, information about successful association of the UE with the WLAN, and an identifier of a WLAN node successfully associated with the UE.
  • the information about abnormal WLAN connection can further contain one or more of the following: information about WLAN connection failure caused by a WLAN radio link issue, information about WLAN connection failure caused by an internal reason of the UE (for example, the UE closes the WLAN, or selects another WLAN node due to the user's preference), information about WLAN connection failure caused by the rejection from the WLAN, and information about WLAN connection failure due to a timeout failure.
  • the WLAN state information can be WLAN state information latest reported by the UE, or historical WLAN state information.
  • indication information about whether to establish the WLAN aggregation for the UE is used by the first radio access network node to decide whether the WLAN aggregation for the UE can be immediately established according to the received other WLAN information about the UE.
  • the WLAN measurement report information comprises one or more of the following:
  • a WLAN identifier (which is as described above and will not be repeated here) of a WLAN node, a WLAN frequency band or a WLAN carrier frequency supported by the WLAN node, the channel quality of the WLAN node (e.g., RSSI), an available admission capacity, an available backhaul network downlink bandwidth, an available backhaul network uplink bandwidth, a channel utilization ratio, the number of accessible terminals (e.g., stationCount), a WLAN measurement report event, and indication information about whether there is a WLAN node satisfying the WLAN aggregation conditions of the UE.
  • the channel quality of the WLAN node e.g., RSSI
  • an available admission capacity e.g., an available admission capacity
  • an available backhaul network downlink bandwidth e.g., an available backhaul network uplink bandwidth
  • a channel utilization ratio e.g., the number of accessible terminals (e.g., stationCount)
  • stationCount e.g., stationCount
  • the WLAN measurement report event contains one or more of the following: event 1 (there is a WLAN node superior to a threshold), event 2 (all WLAN nodes in the mobility set of the WLAN aggregation for the UE are inferior to the threshold and there is a WLAN node beyond the mobility set superior to the threshold), and event 3 (all WLAN nodes in the mobility set of the WLAN aggregation for the UE are inferior to the threshold).
  • the threshold is a threshold condition for the WLAN aggregation for the UE.
  • the WLAN measurement report information is information about a WLAN node measured by the UE according to the WLAN measurement configuration.
  • content about the information about WLAN node candidates for the WLAN aggregation for the UE contains one or more of the content the WLAN measurement report information and will not be repeated here.
  • the information about WLAN node candidates for the WLAN aggregation for the UE is information about WLAN node candidates for the WLAN aggregation for the UE when the UE performs WLAN aggregation, or information about WLAN node candidates for the WLAN aggregation for the UE in the mobility set for the WLAN aggregation.
  • a WLAN node candidate for the WLAN aggregation for the UE can be the best WLAN node measured in the WLAN frequency band or carrier frequency.
  • the second radio access network, the UE or the core network select the best WLAN node from the WLAN nodes, which are measured in the WLAN frequency band or carrier frequency by the UE according to the designed measurement.
  • the best standard is achieved in a combination of one or more of the following conditions: the channel equality (e.g., RSSI), the available admission capacity, the available backhaul network downlink bandwidth, the available backhaul network uplink bandwidth, the channel utilization ratio, and the number of accessible terminals (e.g., stationCount).
  • the information about WLAN node candidates for the WLAN aggregation for the UE further contains indication information of the absence of WLAN node candidates for the WLAN aggregation for the UE, indicating that there is no WLAN node satisfying the WLAN aggregation conditions.
  • the first radio access network node receives the information about WLAN node candidates for the WLAN aggregation for the UE or the information about WLAN node candidates for the WLAN aggregation for the UE is not null, it is indicated that the mobility set of the WLAN aggregation for the UE is to be changed.
  • the content of the information about a WLAN node currently associated with the UE contains one or more of the WLAN measurement report information and will not be repeated here.
  • the first radio access network node can also associate to the source WT.
  • the WLAN measurement configuration information comprises one or more of the following: a WLAN identifier of the measured WLAN node (which is as described above and will not be repeated here), and a measured WLAN frequency band or WLAN carrier frequency (which is as described above and will not be repeated here).
  • the identifier of the serving PLMN is an identifier of a PLMN currently serving the UE.
  • the PLMN or operator to which each WLAN node belongs may be different.
  • only WLAN nodes in the serving PLMN of the UE can be configured to perform WLAN aggregation for the UE.
  • Step 302 WLAN aggregation for the UE is controlled according to the acquired WLAN information.
  • the controlling WLAN aggregation for the UE comprises at least one of the following: deciding whether to establish WLAN aggregation for the UE; determining a WT node for the WLAN aggregation for the UE; and, transmitting the updated WLAN aggregation security information.
  • the first radio access network node decides whether to request the determined WT node to establish WLAN aggregation.
  • the first radio access network node determines to maintain a source WT node serving the UE when one or more of the following conditions are satisfied. In some implementations, when it is determined to maintain the source WT node serving the UE, the first radio access network node requests the source WT node to establish WLAN aggregation.
  • the mobility set of the WLAN aggregation is decided to be maintained.
  • the first radio access network node reuses one or more of the received configuration information about the WLAN aggregation for the UE to establish WLAN aggregation for the WT.
  • the first radio access network node can decide to maintain the mobility set of the WLAN aggregation according to the following:
  • the information about WLAN node candidates for the WLAN aggregation for the UE is not received or the information about WLAN node candidates for the WLAN aggregation for the UE is null.
  • the first radio access network node determines a WT node serving the UE, so as to decide whether to change the WT node.
  • the WLAN node currently associated with the UE satisfies the requirements of WLAN aggregation.
  • the received WLAN state information of the UE is the connection of the UE to the WLAN is normal.
  • the received WLAN state information of the UE is that the connection of the UE to the WLAN is abnormal, but the connection of the UE to the WLAN can be restored to a normal state by updating the mobility set of the WLAN aggregation for the UE. For example, due to the user's preference, a WLAN node beyond the mobility set of the WLAN aggregation for the UE is selected, but the user's preferred WLAN node satisfies the requirements of WLAN aggregation.
  • the first radio access network node establishes WLAN aggregation for the UE when the UE satisfies the conditions of establishing WLAN aggregation, for example, one or more of the following conditions.
  • WLAN node satisfying the conditions for the WLAN aggregation for the UE, for example, one or more of the following:
  • the state of the UE and the state of the WLAN is normal.
  • the received WLAN state information of the UE is the connection of the UE to the WLAN is normal.
  • the first radio access network node decides not to establish WLAN aggregation for the UE when the UE does not satisfy the conditions of establishing WLAN aggregation, for example, one or more of the following conditions. In some implementations, if the first radio access network finds that the UE does not satisfy the conditions of establishing WLAN aggregation upon receiving a handover request, the first radio access network does not establish WLAN aggregation for the UE during the handover. Not until the UE satisfies the conditions of establishing WLAN aggregation again, the first radio access network then decides whether to establish WLAN aggregation for the UE as desired.
  • the indication information about whether to establish the WLAN aggregation for the UE is NO.
  • the WLAN state of the UE is abnormal, for example, one or more of the following:
  • the information about WLAN connection failure caused by an internal reason of the UE is received (for example, the UE closes the WLAN or selects another WLAN node due to the user's preference);
  • the UE selects a WLAN node not belonging to the mobility set of the WLAN aggregation for the UE (for example, selects a WLAN node not belonging to the mobility set of the WLAN aggregation for the UE due to the user's preference), but the user's preferred WLAN node does not satisfy the requirements of WLAN aggregation.
  • the mobility set of the WLAN aggregation for the UE, the indication information of the absence of WLAN node candidates for the WLAN aggregation for the UE, the WLAN measurement report information, the information about WLAN node candidates for the WLAN aggregation for the UE, the WLAN state information of the UE and the indication information about whether to establish WLAN aggregation for the UE are all as described in the step 301 and will not be repeated here.
  • the first radio access network node transmits the updated WLAN aggregation security information when the acquired WLAN information about the UE comprises at least one of the following: the WT-created UE context indication information, and the indication of update WLAN aggregation security information.
  • the first radio access network node can transmit updated WLAN aggregation security information to at least one of the following: a second radio access network node, the UE and a WT.
  • the present invention further discloses a radio access network node, comprising:
  • a receiving module configured to acquire WLAN information about a UE
  • a determination module configured to control WLAN aggregation for the UE according to the acquired WLAN information.
  • Fig. 4 is a schematic flowchart of a second method for enhancing WLAN aggregation mobility according to the present invention. This method comprises the following steps.
  • Step 401 By a second radio access network node, whether to maintain a WT and/or whether to establish WLAN aggregation for a UE is decided when the UE moves to a first radio access network.
  • the second radio aces network node acquires, from the UE, a WT, the second radio aces network node or a core network node, the WLAN information about the UE so as to decide whether to maintain the WT or whether to establish WLAN aggregation for the UE.
  • the second radio access network node decides whether to maintain the WT or whether to establish WLAN aggregation for the UE when the UE moves to the first radio access network.
  • the second radio access network node decides not to establish WLAN aggregation for the UE when one or more of the following conditions are satisfied. In some implementations, the second radio access network node sets the indication information about whether to establish WLAN aggregation for the UE as NO.
  • the WLAN state of the UE is abnormal, for example, one or more of the following:
  • the information about WLAN connection failure caused by an internal reason of the UE is received (for example, the UE closes the WLAN or selects another WLAN node due to the user's preference);
  • the UE selects a WLAN node not belonging to the mobility set of the WLAN aggregation for the UE (for example, selects a WLAN node not belonging to the mobility set of the WLAN aggregation for the UE due to the user's preference), but the user's preferred WLAN node does not satisfy the requirements of WLAN aggregation.
  • the second radio access network node decides to establish WLAN aggregation for the UE when one or more of the following conditions are satisfied. In some implementations, the second radio access network node sets the indication information about whether to establish WLAN aggregation for the UE as YES.
  • the WLAN state of the UE is normal.
  • the received WLAN state information of the UE is that the connection of the UE to the WLAN is normal.
  • the received WLAN state information of the UE is that the connection of the UE to the WLAN is abnormal, but the connection of the UE to the WLAN can be restored to a normal state by updating the mobility set of the WLAN aggregation for the UE (the contents are as described in the step 301). For example, due to the user's preference, a WLAN node beyond the mobility set of the WLAN aggregation for the UE is selected, but the user's preferred WLAN node satisfies the requirements of WLAN aggregation. For example, the WLAN state is abnormal, and the WLAN node currently associated with the UE satisfies the requirements of the WLAN aggregation.
  • the second radio access network node determines to maintain the mobility set for the WLAN aggregation for the UE when one or more of the following are satisfied.
  • An event of changing the mobility set of the WLAN aggregation for the UE does not occur. For example, one or more of the following conditions are satisfied:
  • the WLAN measurement report information of the UE is not received.
  • the UE reports the WLAN measurement report information only when there is no WLAN node satisfying the threshold conditions for WLAN aggregation in the current mobility set of the WLAN aggregation for the UE. Therefore, when the WLAN measurement report information of the UE is not received, it is indicated that the mobility set of the WLAN aggregation for the UE may not be updated.
  • the WLAN state of the UE is normal.
  • the received WLAN state information of the UE is that the connection of the UE to the WLAN is normal.
  • the second radio access network node determines not to change a source WT node serving the UE when one or more of the following are satisfied.
  • the mobility set of the WLAN aggregation is to be changed, but the changed mobility set of the WLAN aggregation is still within a management range of the source WT.
  • the WLAN state of the UE is normal.
  • the received WLAN state information of the UE is that the connection of the UE to the WLAN is normal.
  • the mobility set of the WLAN aggregation for the UE, the indication information of the absence of WLAN node candidates for the WLAN aggregation for the UE, the WLAN measurement report information, the information about WLAN node candidates for the WLAN aggregation for the UE and the WLAN state information of the UE are all as described in the step 301 and will not be repeated here.
  • Step 402 By the second radio access network node, information about whether to maintain the WT and/or indication information about whether to establish WLAN aggregation for the UE is transmitted.
  • the second radio access network node specifically transmit the information about whether to maintain the WT and/or the indication information about whether to establish WLAN aggregation for the UE to a first radio access network node, the UE, the WT or a core network node.
  • the second radio access network node transmits the decided information of maintaining the WT to the first radio access network node.
  • the information of maintaining the WT contains one or more of the following: indication information of maintaining the WT and information about the WT for the WLAN aggregation for the UE.
  • indication information of maintaining the WT indicates whether the WT is a Wi-Fi connection.
  • information about the WT for the WLAN aggregation for the UE is as described in the step 301 and will not be repeated here.
  • the second radio access network node transmits the WLAN information about the UE to the first radio access network node.
  • the WLAN information about the UE is as described in the step 301 and will not be repeated here.
  • the transmitted configuration information about the WLAN aggregation for the UE is configuration information about the WLAN aggregation for the UE which is updated by the second radio access network node, for example, the mobility set of the WLAN aggregation for the UE which is updated according to the WLAN measurement report.
  • the second radio access network node transmits the indication information about whether to establish WLAN aggregation for the UE to the first radio access network node.
  • the second radio access network node does not transmit the configuration information about the WLAN aggregation for the UE (the WLAN information about the UE is as described in the step 301) or the WLAN information about the UE (the WLAN information about the UE is as described in the step 301) to the first radio access network node, so it is indicated that it is unable to establish WLAN aggregation for the UE or the conditions for the WLAN aggregation for the UE are not satisfied.
  • the first radio access network node can establish WLAN aggregation for the UE as required after the UE satisfies the conditions for WLAN aggregation again.
  • the indication information of maintaining the WT can represent at least one of the following: the WT reuses the existing UE context in the WT, and information in a WT addition request message (e.g., new WLAN aggregation security information) is ignored.
  • the WT aggregation security information is as described in the step 301 and will not be repeated here.
  • Fig. 5 is a schematic flowchart of a third method for enhancing WLAN aggregation mobility according to the present invention. This method comprises the following steps.
  • Step 501 WLAN information about a UE is transmitted to a first radio access network node by a second radio access network node.
  • the WLAN information about the UE is as described in the step 301 and will not be repeated here.
  • the second radio access network node transmits one or more of the following information to the first radio access network node: WLAN measurement report information of the UE, information about WLAN node candidates for the WLAN aggregation for the UE, an identifier of the UE, WLAN state information of the UE, an identifier of a serving PLMN, information about a WLAN node currently associated with the UE, WLAN measurement configuration information, and the WLAN capability of the UE.
  • the specific content of the information is as described in the step 301 and will not be repeated here.
  • Step 502 The first radio access network node decides whether to establish WLAN aggregation for the UE according to the received WLAN information about the UE.
  • the first radio access network node during preparing for handover or when a handover occurs, the first radio access network node establishes, for a WT, WLAN aggregation for the UE and then returns handover request acknowledge to the second radio access network node.
  • the present invention further discloses a radio access network node, comprising:
  • a module configured to decide whether to maintain a WT and/or whether to establish WLAN aggregation for a UE when the UE moves to a first radio access network
  • a module configured to transmit information about whether to maintain the WT and/or indication information about whether to establish the WLAN aggregation for the UE.
  • Fig. 6 is a schematic flowchart of a fourth method for enhancing WLAN aggregation mobility according to the present invention. This method comprises the following steps.
  • Step 601 By a WT, UE context reference information transmitted by a first radio access network node is received.
  • the WT upon receiving a WLAN aggregation setup request from a UE, the WT receives UE context reference information transmitted by the first radio access network node. In some implementations, the UE context reference information is carried in a WT addition request message.
  • the UE context reference information comprises: a UE identifier, and indication information of maintaining a UE context in the WT.
  • the content of the UE identifier is the same as that in the step 301 and will not be repeated here.
  • the UE identifier can be used for two purposes. On one hand, during WLAN aggregation, the UE identifier is used by the WT to determine whether the UE is successfully associated with a WLAN node under the WT; and on the other hand, the UE identifier is used for indicating whether the WT has found the existing UE context.
  • the UE identifier for two purposes refers to a same UE identifier (for example, the MAC address of the UE in the WLAN).
  • the UE identifier for two purposes refers to two UE identifiers, respectively: a first UE identifier and a second UE identifier.
  • the first UE identifier (for example, the MAC address of the UE in the WLAN) is used by the WT to determine whether the UE is successfully associated with a WLAN node under the WT during the WLAN aggregation; and the second UE identifier (for example, WT UE Xw AP ID) is used for indicating whether the WT has found the existing UE context.
  • Step 502 The WT prepares WLAN aggregation for the UE according to the first radio access network node.
  • the WT receives, in a WT release request message or a UE context release message, indication information of maintaining a UE context in the WT.
  • Step 602 By a WT, a UE context is indexed according to the received UE context reference information.
  • the WT indexes a UE context established in the WT according to the received UE identifier. For example, according to the received UE identifier, the WT indexes a UE context which is established in the WT by a second radio access network node.
  • the WT maintains the indexed UE context according to the indication information of maintaining the UE context in the WT.
  • the WT further prepare the configuration information about WLAN aggregation for the UE and transmit it to the first radio access network node or the UE.
  • the WT replies configuration information about the WLAN aggregation for the UE together.
  • the configuration information about the WLAN aggregation for the UE is as described in the step 301.
  • the first radio access network node Upon receiving the configuration information about the WLAN aggregation for the UE, the first radio access network node forwards the configuration information to the UE via the second radio access network node or via the core network node.
  • the WT after the WT has indexed the UE context, the WT returns WT association confirmation indication information to the first radio access network node, so as to trigger the first radio access network node to immediately transmit UE data to the WT.
  • the WT can contain the WT association confirmation indication information or a trigger WT association confirmation message in a WLAN aggregation setup response or the WT addition request acknowledge.
  • the WT when the WT has not indexed the existing UE context, the WT can create a UE context. At this time, the WT can execute at least one of the following: not returning the WT association confirmation indication information, returning WT-created UE context indication information, and returning an indication of update WLAN aggregation security information (for example, key Kwt).
  • the first radio access network node can execute one of the following: transmitting the updated WLAN aggregation security information to the UE or the WT, when at least one of the following conditions is satisfied: no receipt of the WT association confirmation indication information, receipt of the indication information of creating a UE context and receipt of the indication of update WLAN aggregation security information.
  • the first radio access network node can transmit the updated WLAN aggregation security information to the UE via the second radio access network node.
  • the present invention further discloses a WT, specifically comprising:
  • a module configured to receive UE context reference information transmitted by a first radio access network node
  • a module configured to index a UE context according to the received UE context reference information.
  • Fig. 13 is a schematic flowchart of a fifth method for enhancing WLAN aggregation mobility according to the present invention. This method comprises the following steps.
  • Step 1301 By a WT, WLAN aggregation release information is received.
  • the WLAN aggregation release information can comprise at least one of the following: indication information of maintaining a UE context in the WT, indication information of maintaining a connection to a UE between the WT and a radio access network node, and indication information of stopping transmitting downlink data to a UE.
  • the WT can receive the WLAN aggregation release information from at least one of the following: a radio access network node, the UE and a core network.
  • Step 1302 By the WT, a related operation of releasing WLAN aggregation is executed according to the received WLAN aggregation release information.
  • the WT upon receiving the WLAN aggregation release information from a radio access network node for the first time, the WT can execute at least one of the following: maintaining a UE context, maintaining a connection to the UE between the WT and a radio access network node, and stopping transmitting downlink data to the UE.
  • the WT Upon receiving the WLAN aggregation release information from a radio access network node for the second time, the WT can execute at least one of the following: maintaining the UE context, and releasing the connection to the UE between the WT and the radio access network node.
  • the WT can execute at least one of the following: maintaining the UE context, maintaining a connection to the UE between the WT and a radio access network node, and stopping transmitting downlink data to the UE.
  • the WT can execute at least one of the following: maintaining the UE context, and maintaining the connection to the UE between the WT and the radio access network node.
  • the WT can execute at least one of the following: maintaining the UE context, and releasing the connection to the UE between the WT and the radio access network node.
  • the handover process it is necessary to update a security uplink text between the UE and a base station, so the data transmission will be interrupted; and if it is able to continue to perform transmission between the UE and the WT, the throughput of the UE can be maintained during the handover.
  • the WT can stop transmitting data encrypted by an old key to the UE, so radio resources are avoided from being occupied by too much invalid data.
  • the connection to the UE between the WT and a source radio access network node is maintained to continuously transmit the uplink data.
  • the connection to the UE between the WT and the source radio access network node is released. In this process, the existing UE context in the WT is reused, and is not required to be released.
  • the present invention further discloses a WT, specifically comprising:
  • a module configured to receive WLAN aggregation release information
  • a module configured to release WLAN aggregation according to the received WLAN aggregation release information.
  • Fig. 14 is a schematic flowchart of a sixth method for enhancing WLAN aggregation mobility according to the present invention. This method comprises the following steps.
  • Step 1401 By a radio access network node, whether pre-defined conditions are satisfied is decided.
  • the pre-defined conditions can comprise at least one of the following: receipt of indication information of maintaining a UE context in a WT, aware of handover start, receipt of handover request acknowledge, aware of handover completion, and receipt of a UE context release request.
  • the indication information of maintaining the UE context in the WT is as described in the step 601 and will not be repeated here.
  • Step 1402 By the radio access network node, WLAN aggregation release information is transmitted according to the satisfied pre-defined conditions.
  • the contents contained in the WLAN aggregation release information are as described in the step 1301 and will not be repeated here.
  • the radio access network node at least transmits the WLAN aggregation release information to one of the following: a radio access network node, a UE and a core network.
  • the radio access network node can execute at least one of the following:
  • the WLAN aggregation release information at least contain one of the following: 1) indication information of maintaining a connection to the UE between the WT and the radio access network node; 2) indication information of maintaining a UE context in the WT; and, 3) stopping transmitting downlink data to the UE.
  • the radio access network node can execute at least one of the following:
  • the WLAN aggregation release information at least contain one of the following: 1) indication information of releasing a connection to the UE between the WT and the radio access network node; and, 2) indication information maintaining a UE context in the WT.
  • the handover it is necessary to update a security uplink text between the UE and a base station, so the data transmission will be interrupted; and if it is able to continue to perform transmission between the UE and the WT, the throughput of the UE can be maintained during the handover.
  • the WT can stop transmitting data encrypted by an old key to the UE, so radio resources are avoided from being occupied by too much invalid data.
  • the connection to the UE between the WT and a source radio access network node is maintained to continuously transmit the uplink data.
  • the connection to the UE between the WT and the source radio access network node is released. In this process, the existing UE context in the WT is reused, and is required not to be released.
  • the present invention further discloses a radio access network node, specifically comprising:
  • a module configured to decide whether pre-defined conditions are satisfied to receive WLAN aggregation release information
  • a module configured to transmit the WLAN aggregation release information according to the satisfied pre-defined conditions.
  • Embodiments of the method for enhancing WLAN aggregation mobility provided by the preset invention in different mobility scenarios will be described below according to different actual mobility scenarios of a user equipment.
  • Fig. 7 is a schematic diagram of Embodiment 1 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • the scenario is that a target radio access network node determines not to change a WT node for WLAN aggregation for a UE according to the WLAN information about the UE, which is received from a source radio access network node, when the UE is handed over between radio access network nodes (e.g., X2 handover).
  • the target radio access network node is the first radio access network node described above
  • the source radio access network node is the second radio access network node described above.
  • the method comprises the following steps.
  • Step 701 A handover request message is transmitted to a target radio access network node by a source radio access network node.
  • the handover request message contains WLAN information about a UE (the WLAN information about the UE is as described in the step 301).
  • the target radio access network node can determine a WT node for WLAN aggregation for the UE according to the received WLAN information about the UE.
  • the specific operation is as described in the step 302.
  • Step 702 When it is determined to maintain a source WT, the target radio access network node transmits a WT addition request message to the source WT.
  • the WT addition request message contains UE context reference information (as described in the step 601). According to the received UE context reference information, the WT finds a UE context established in the WT by the source radio access network. The specific operation is as described in the step 602 and will not be repeated here.
  • Step 703 A WT addition request acknowledge message is transmitted to the target radio access network node by the source WT node.
  • this message contains a configuration for the WLAN aggregation for the UE (as described in the step 602), for example, a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN (e.g., access category or priority).
  • the UE can bear uplink data transmission of a WLAN aggregation bearer decided by the mapped access category.
  • different categories have different back-off times during a resource collision.
  • this message contains WT association confirmation indication information, or a WT association confirmation message transmitted by a subsequent source WT to the target access network node subsequently.
  • Step 704 A handover request acknowledge message is returned to the source radio access network node by the target radio access network node.
  • the handover request acknowledge message contains configuration information about the WALN aggregation for the UE (as described in the step 301), and indication information of maintaining a UE context in the WT (as described in the step 601).
  • the configuration information about the WALN aggregation for the UE further contains a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN.
  • Step 705 In a preferred implementation, the WT returns a WT association confirmation to the target radio access network node.
  • Step 706 the source radio access network node transmits a WT release request message to the WT.
  • the WT executes at least one of the following according to the received indication information of maintaining a UE context in the WT: maintaining the UE context, maintaining a connection to the UE between the WT and a radio access network node, and stopping transmitting downlink data to the UE.
  • the WT executes at least one of the following according to the received indication information of maintaining a connection to the UE between the WT and a radio access network node: maintaining the UE context, and maintaining the connection to the UE between the WT and the radio access network node.
  • Step 707 An RRC reconfiguration request message is transmitted to the UE by the source radio access network node.
  • this message contains configuration information about the WLAN aggregation for the UE, for trigging the UE to adopt new WLAN aggregation configuration information.
  • Step 708 An RRC reconfiguration completion message is returned to the target radio access network node by the UE.
  • the new WLAN aggregation configuration information adopted by the UE is carried in this message.
  • Step 709 A path switch request is transmitted to a core network node by the target radio access network node.
  • Step 710 A path conversion acknowledge is transmitted to the target radio access network node by the core network node.
  • Step 711 A UE context release message is transmitted to a radio access network node by the target radio access network node.
  • Step 712 the source radio access network node transmits a UE context release message or a WT release request message to the WT.
  • the WT executes at least one of the following according to the received indication information of maintaining a UE context in the WT: maintaining the UE context, and releasing a connection to the UE between the WT and a radio access network node.
  • the WT executes at least one of the following according to the received indication information of releasing a connection to the UE between the WT and a radio access network node: maintaining the UE context, and releasing the connection to the UE between the WT and the radio access network node.
  • Embodiment 1 ends.
  • Fig. 8 is a schematic diagram of Embodiment 2 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • the scenario is that a target radio access network node determines to create WLAN aggregation for a UE according to the WLAN information about the UE, which is received from a source radio access network node, when the UE is handed over between radio access network nodes (e.g., X2 handover).
  • the target radio access network node is the first radio access network node described above
  • the source radio access network node is the second radio access network node described above.
  • the method comprises the following steps.
  • Step 801 A handover request message is transmitted to a target radio access network node by a source radio access network node.
  • the handover request message contains WLAN information about a UE (as described in the step 301).
  • the target radio access network node can determine a WT node for creating WLAN aggregation for the UE according to the received WLAN information about the UE.
  • the specific operation is as described in the step 302.
  • Step 802 When it is determined to establish WLAN aggregation for a UE, the target radio access network node transmits a WT addition request message to the selected WT node.
  • Step 803 The WT addition request acknowledge message is transmitted to the target radio access network node by the WT node.
  • this message contains a configuration for the WLAN aggregation for the UE (as described in the step 602), for example, a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN (e.g., access category or priority).
  • the UE can bear uplink data transmission of a WLAN aggregation bearer decided by the mapped access category.
  • different categories have different back-off times during a resource collision.
  • this message contains WT association confirmation indication information, or a WT association confirmation message transmitted by the WT to the target access network node subsequently.
  • Step 805 A handover request acknowledge message is returned to the source radio access network node by the target radio access network node.
  • the handover request acknowledge message contains configuration information about the WALN aggregation for the UE (as described in the step 301), and indication information of maintaining a UE context in the WT.
  • the configuration information about the WALN aggregation for the UE further contains a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN.
  • Step 806 An RRC reconfiguration request is transmitted to the UE by the source radio access network node.
  • this message contains configuration information about the WLAN aggregation for the UE, for trigging the UE to adopt new WLAN aggregation configuration information.
  • Step 807 An RRC reconfiguration completion message is returned to the target radio access network node by the UE.
  • Step 808 A path switch request message is transmitted to a core network node by the target radio access network node.
  • Step 809 A path switch request acknowledge message is transmitted to the target radio access network node by the core network node.
  • Step 810 A UE context release message is transmitted to a radio access network node by the target radio access network node.
  • Fig. 9 is a schematic diagram of Embodiment 3 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • the scenario is that a target radio access network node determines not to change a WT node for WLAN aggregation for a UE according to the WLAN information about the UE, which is received from a source radio access network node, when the UE is handed over between radio access network nodes through a core network node (e.g., S1 handover).
  • the target radio access network node is the first radio access network node described above
  • the source radio access network node is the second radio access network node described above.
  • the method comprises the following steps.
  • Step 901 A handover required message is transmitted to a core network node by a source radio access network node.
  • the handover required message contains WLAN information about a UE (as described in the step 301).
  • Step 902 A handover request is transmitted to a target radio access network node by the core network node.
  • the handover request message contains the WLAN information about the UE (the WLAN information about the UE is as described in the step 301).
  • the target radio access network node can determine a WT node for WLAN aggregation for the UE according to the received WLAN information about the UE.
  • the specific operation is as described in the step 302.
  • Steps 903 to 904 are the same as the steps 702 to 703 and will not be repeated here.
  • Step 905 A handover request acknowledge message is transmitted to the core network node by the target radio access network node.
  • the handover request acknowledge message contains configuration information about the WALN aggregation for the UE (as described in the step 301), and indication information of maintaining a UE context in the WT.
  • the configuration information about the WALN aggregation for the UE further contains a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN.
  • Step 906 A handover command is transmitted to the source radio access network node by the core network node.
  • the handover command message contains configuration information about the WALN aggregation for the UE (as described in the step 301), and indication information of maintaining a UE context in the WT.
  • the configuration information about the WALN aggregation for the UE further contains a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN.
  • 3GPP QoS e.g., QCI, ARP, MBR, GBR or more
  • Steps 907 to 909 are consistent with the steps 706 to 708 and will not be repeated here.
  • Step 910 A handover notification is transmitted to the core network node by the target radio access network node.
  • Step 911 A UE context release message is transmitted to the source radio access network node by the core network node.
  • Step 912 is consistent with the step 712 and will not be repeated here.
  • Fig. 10 is a schematic diagram of Embodiment 4 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • the scenario is that a target radio access network node determines to create WLAN aggregation for a UE according to the WLAN information about the UE, which is received from a source radio access network node, when the UE is handed over between radio access network nodes through a core network node (e.g., S1 handover).
  • the target radio access network node is the first radio access network node described above
  • the source radio access network node is the second radio access network node described above.
  • the method comprises the following steps.
  • Step 1001 A handover required message is transmitted to a core network node by a source radio access network node.
  • the handover required message contains WLAN information about a UE (as described in the step 301).
  • Step 1002 A handover request is transmitted to a target radio access network node by the core network node.
  • the handover request message contains the WLAN information about the UE (the WLAN information about the UE is as described in the step 301).
  • the target radio access network node can determine a WT node for WLAN aggregation for the UE according to the received WLAN information about the UE.
  • the specific operation is as described in the step 302.
  • Steps 1003 to 1004 are the same as the steps 802 to 803 and will not be repeated here.
  • Step 1005 A handover request acknowledge message is transmitted to the core network node by the target radio access network node.
  • the handover request acknowledge message contains configuration information about the WALN aggregation for the UE (as described in the step 301), and indication information of maintaining a UE context in the WT.
  • the configuration information about the WALN aggregation for the UE further contains a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN.
  • Step 1006 A handover command is transmitted to the source radio access network node by the core network node.
  • the handover command message contains configuration information about the WALN aggregation for the UE (as described in the step 301), and indication information of maintaining a UE context in the WT.
  • the configuration information about the WALN aggregation for the UE further contains a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN.
  • Steps 1007 to 1008 are consistent with the steps 806 to 807 and will not be repeated here.
  • Step 1009 A handover notification is transmitted to the core network node by the target radio access network node.
  • Step 1010 A UE context release message is transmitted to the source radio access network node by the core network node.
  • Step 1011 A UE context release message is transmitted to a radio access network node by the target radio access network node.
  • Fig. 11 is a schematic diagram of Embodiment 5 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • the scenario is that a radio access network node creates WLAN aggregation for a UE.
  • the target radio access network node is the first radio access network node described above
  • the source radio access network node is the second radio access network node described above.
  • the method comprises the following steps.
  • Step 1101 When it is determined to establish WLAN aggregation for a UE, a target radio access network node transmits a WT addition request message to a selected WT node.
  • Step 1102 A WT addition request acknowledge message is transmitted to the target radio access network node by the WT node.
  • this message contains a configuration for the WLAN aggregation for the UE (as described in the step 602), for example, a mapping result of the 3GPP QoS (e.g., QCI, ARP, MBR, GBR or more) of a UE bearer and the QoS of a WLAN (e.g., access category or priority).
  • the UE can bear uplink data transmission of a WLAN aggregation bearer decided by the mapped access category.
  • different categories have different back-off times during a resource collision.
  • Step 1103 An RRC reconfiguration request is transmitted to the UE by a radio access network node.
  • this message contains configuration information about the WLAN aggregation for the UE, for trigging the UE to adopt new WLAN aggregation configuration information.
  • Step 1104 An RRC reconfiguration completion message is returned to the radio access network node by the UE.
  • Step 1105 After an association of the UE with a WLAN is established, the WT returns a WT association confirmation message to the radio access network node.
  • Fig. 12 is a schematic diagram of Embodiment 6 of the method for enhancing WLAN aggregation mobility according to the present invention.
  • the scenario is that a target radio access network node determines not to immediately create WLAN aggregation for a UE according to the WLAN information about the UE, which is received from a source radio access network node, when the UE is handed over between radio access network nodes (e.g., X2 handover).
  • the target radio access network node is the first radio access network node described above
  • the source radio access network node is the second radio access network node described above.
  • the target radio access network node is the first radio access network node described above, and the source radio access network node is the second radio access network node described above.
  • the method comprises the following steps.
  • Step 1201 A handover request message is transmitted to a target radio access network node by a source radio access network node.
  • the handover request message contains WLAN information about a UE (the WLAN information about the UE is as described in the step 301).
  • the target radio access network node can determine a WT node for WLAN aggregation for the UE according to the received WLAN information about the UE.
  • the specific operation is as described in the step 302. In some implementations, if the WLAN information about the UE is indicative of not establishing WLAN aggregation for the UE immediately, the target radio access network node will not establish WLAN aggregation for the UE.
  • Step 1202 After the handover configuration is prepared, a handover request acknowledge message is returned to the source radio access network node by the target radio access network node.
  • Step 1203 In a preferred implementation, the source radio access network node transmits a WT release request message to a WT. In some implementations, the WT releases a UE context upon receiving this message.
  • Step 1204 An RRC reconfiguration request message is transmitted to the UE by the source radio access network node.
  • Step 1205 An RRC reconfiguration completion message is returned to the target radio access network node by the UE.
  • Step 1206 A path switch request is transmitted to a core network node by the target radio access network node.
  • Step 1207 A path switch request acknowledge message is transmitted to the target radio access network node by the core network node.
  • Step 1208 A UE context release message is transmitted to a radio access network node by the target radio access network node.
  • Step 1209 In a preferred implementation, the source radio access network node transmits a UE context release message or a WT release request message to the WT. In some implementations, the WT releases the UE context upon receiving this message.
  • WLAN information about a UE is acquired by the interoperation of a radio access network and a WT, and the process of establishing WLAN aggregation is optimized in a UE mobility scenario, so that the signaling overhead is reduced, and the continuity of data and the high data transmission rate are maintained. Accordingly, the WLAN aggregation performance in the UE mobility scenario is enhanced, and the user experience is further improved.

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

Abstract

La présente invention concerne un système de communication 5G ou de pré-5ème génération conçu pour prendre en charge des débits de données supérieurs dépassant un système de communication (4G) de 4ème génération telle qu'une technologie d'évolution à long terme (LTE). La présente invention concerne un procédé destiné à commander une agrégation de Réseau Local Sans Fil (WLAN) et un équipement associé. Le procédé comprend les étapes suivantes consistant : à acquérir, au moyen d'un premier nœud de réseau d'accès radio, les informations WLAN concernant un Équipement Utilisateur (UE) ; et, à commander, au moyen d'un premier nœud de réseau d'accès radio, l'agrégation WLAN destinée à l'UE conformément aux informations WLAN acquises. Un second nœud de réseau d'accès radio décide si il est nécessaire de maintenir une WT et/ou d'établir une agrégation de WLAN pour l'UE lorsque l'UE se déplace vers un premier réseau d'accès radio ; et, le second nœud de réseau d'accès radio transmet des informations concernant le fait de savoir si il est nécessaire de maintenir le WT et/ou des informations d'indication concernant le fait de savoir si il faut établir l'agrégation de WLAN pour l'UE. Le WT reçoit les informations de référence de contexte UE transmises au moyen du premier nœud de réseau d'accès radio ; et, le WT indexe un contexte d'UE conformément aux informations de référence de contexte de l'UE reçues. La présente invention permet d'améliorer les performances de l'agrégation WLAN dans un scénario de mobilité de l'UE.
PCT/KR2017/003552 2016-04-01 2017-03-31 Procédé destiné à commander l'agrégation de réseau local sans fil et équipement associé WO2017171470A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP17775894.3A EP3424237B1 (fr) 2016-04-01 2017-03-31 Procédé destiné à commander l'agrégation de réseau local sans fil et équipement associé
US16/090,556 US11558789B2 (en) 2016-04-01 2017-03-31 Method for controlling wireless local area network aggregation and associated equipment
KR1020187028527A KR102310861B1 (ko) 2016-04-01 2017-03-31 무선 랜 집성 및 연관된 장치를 제어하는 방법
KR1020217031759A KR102456336B1 (ko) 2016-04-01 2017-03-31 무선 랜 집성 및 연관된 장치를 제어하는 방법
EP20201542.6A EP3823353B1 (fr) 2016-04-01 2017-03-31 Procédé destiné à commander l'agrégation de réseau local sans fil et équipement associé

Applications Claiming Priority (4)

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CN201610204757 2016-04-01
CN201610204757.1 2016-04-01
CN201610875793.0A CN107277850B (zh) 2016-04-01 2016-09-30 无线局域网聚合的控制方法和相关设备
CN201610875793.0 2016-09-30

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