WO2015077923A1 - Procédé, système et dispositif de traitement de commutation - Google Patents

Procédé, système et dispositif de traitement de commutation Download PDF

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Publication number
WO2015077923A1
WO2015077923A1 PCT/CN2013/087870 CN2013087870W WO2015077923A1 WO 2015077923 A1 WO2015077923 A1 WO 2015077923A1 CN 2013087870 W CN2013087870 W CN 2013087870W WO 2015077923 A1 WO2015077923 A1 WO 2015077923A1
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WO
WIPO (PCT)
Prior art keywords
base station
wifi
configuration information
switching
handover
Prior art date
Application number
PCT/CN2013/087870
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English (en)
Chinese (zh)
Inventor
张健
曾清海
王可
Original Assignee
华为技术有限公司
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.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380003657.7A priority Critical patent/CN104995955B/zh
Priority to PCT/CN2013/087870 priority patent/WO2015077923A1/fr
Publication of WO2015077923A1 publication Critical patent/WO2015077923A1/fr

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Classifications

    • 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
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology
    • 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]

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a handover processing method, system, and apparatus. Background technique
  • the specific implementation manner in which the eNB controls the mobility of the UE is mainly: the UE receives the configuration information sent by the eNB, performs measurement according to the configuration information, obtains the measurement result, and reports the measurement to the eNB according to the reporting manner in the configuration information. result.
  • the eNB selects a corresponding wireless access node (Access Point; AP for short) according to the measurement result to configure the wif offload.
  • the specific implementation manner of the eNB selecting the corresponding AP configuration wif offload according to the measurement result is: The eNB sends a wifi offload request message carrying the offload configuration request parameter to the AP, and receives the wifi offload response that is returned by the AP and carries the offload configuration response parameter.
  • the eNB further sends a offload configuration response parameter to the UE according to the wifi offload response message, so that the UE performs the wifi offload configuration according to the offload configuration response parameter, selects the corresponding AP access, and performs communication process with the eNB and the wifi. .
  • the UE moves the AP to frequently switch, and the UE must perform the AP handover according to the eNB. Therefore, the signaling interaction between the AP and the eNB and the UE is large, so that there is a large
  • the embodiments of the present invention provide a handover processing method, system, and apparatus, so as to solve the problem that the UE must perform AP handover according to the indication of the eNB, and the signaling interaction between the AP and the eNB and the UE is relatively large, so that there is a large handover. Delay and signaling overhead issues.
  • a first aspect of the embodiments of the present invention provides a handover processing method, including: receiving, by a UE, a handover policy and wifi offload configuration information corresponding to the first base station that is sent by a first base station, where the handover policy is used to indicate The UE performs AP handover according to the roaming mechanism of the WLAN protocol;
  • the UE communicates with the first AP discovered through the WLAN protocol according to the wifi offload configuration information corresponding to the first base station;
  • the UE When the UE moves, the UE acquires the second AP according to the handover policy corresponding to the first base station, associates with the first AP, and communicates with the second AP to implement switching of the AP.
  • the wifi offload configuration information corresponding to the first base station includes a first ESSID
  • the method further includes:
  • the UE When the second ESSID corresponding to the second AP is different from the first ESSID, the UE sends an indication message carrying the second ESSID to the first base station, for the first The base station establishes a communication link and a traffic association with the wifi controller corresponding to the second ESSID.
  • the method further includes: the UE communicating with the second AP, reporting the second AP to the first base station
  • a BSSID for the first base station to establish a communication link and a traffic association with the second AP according to the BSSID.
  • the method further includes: when the UE is in the process of moving, if the second AP is not obtained according to the switching policy, and the first If the AP is associated, the wifi idle state information is reported to the first base station, so that the first base station stops the wifi control associated with establishing the communication link and the offload with the first base station according to the wifi idle state information.
  • the device or AP sends wifi offload data.
  • the method further includes:
  • the UE receives the handover message sent by the first base station, where the handover message includes: RRC connection configuration information corresponding to the second base station; where the RRC connection configuration information corresponding to the second base station is the first base station and The information obtained by the second base station, the wifi offload configuration information and the handover policy corresponding to the second base station;
  • the UE performs a handover process according to the RRC connection configuration information corresponding to the second base station; the UE follows the WLAN offload configuration information corresponding to the second base station, and passes the WLAN.
  • the AP discovered by the protocol performs communication, and performs AP handover processing according to the handover policy corresponding to the second base station during the UE mobility.
  • the method further includes: sending, by the UE, an RRC connection establishment request to the first base station when it is determined that the LTE connection is required to be switched back to the LTE or the LTE is required to be offloaded;
  • the UE receives the RRC connection setup message that is returned by the first base station according to the RRC connection setup request, where the RRC connection setup message includes the wifi offload configuration information and the handover policy corresponding to the first base station.
  • the method further includes: the UE returning a wifi offload configuration reject message to the first base station, where the wifi offload configuration reject message includes a cause value;
  • the reason value is any one of the following: the wifi offload configuration information corresponding to the first base station is wifi offload configuration information sent by the eNB that does not accept access to the public land mobile network, and the UE has accessed Or preparing to access other APs other than the AP list in the wifi offload configuration information corresponding to the first base station, where the UE is performing wifi offload offloading but the current wifi shunt configuration information corresponding to the first base station.
  • the QoS/QoE of the service is smaller than the preset threshold, and the new WLAN service configuration information is added to the WLAN offload configuration information corresponding to the first base station, and the handover policy acquired by the UE from the ANDSF or the locally pre-stored handover policy is
  • the handover policy in the wifi offload configuration information corresponding to the first base station is different, the UE is in an emergency call state, the UE is receiving the MBMS service, and the application layer of the UE identifies that the current service is terminated within the expected time.
  • a second aspect of the embodiments of the present invention provides a handover processing method, including:
  • the first base station sends a wifi offload request to the wifi controller or the AP, and receives the wifi offload response returned by the wifi controller or the AP to establish a communication link and a shunt association with the wifi controller or the AP;
  • the first base station Transmitting, by the first base station, the handover policy and the wifi offload configuration information corresponding to the first base station to the UE, according to the wifi offload response, for the UE to pass the WLAN offload configuration information corresponding to the first base station, and
  • the first AP discovered by the WLAN protocol communicates, and when the UE moves, the UE acquires the second AP according to the handover policy corresponding to the first base station, and associates with the first AP, and the foregoing
  • the second AP performs communication to implement handover of the AP;
  • the handover policy is used to instruct the UE to perform AP handover according to a roaming mechanism of the WLAN protocol.
  • the method further includes:
  • the first base station receives an indication message that is sent by the UE and carries a second ESSID, where the indication message is that the UE is configured to detect a second AP corresponding to the second AP that is obtained according to the handover policy corresponding to the first base station.
  • the first base station establishes a communication link and a traffic association with a wifi controller corresponding to the second ESSID.
  • the method further includes: the first base station receiving a BSSID reported by the UE, where the BSSID is that the UE is corresponding to the first base station The BSSID corresponding to the second AP reported by the second AP after the handover policy is obtained;
  • the first base station establishes a communication link and a traffic association with the second AP.
  • the method further includes: the first base station receiving the wifi idle state information reported by the UE, and stopping the location according to the wifi idle state information
  • the first base station establishes a communication link and a wifi controller or an AP associated with the offloading to send wifi offload data.
  • the method further includes:
  • the first base station sends a handover request message to the second base station, where the handover request message includes: wifi offload configuration information corresponding to the first base station, to indicate that the second base station is configured according to the wifi shunt corresponding to the first base station. Configuring the information, performing the wifi offloading configuration process with the first AP or other APs, where the other APs refer to the wifi controller associated with the first base station to establish a communication link and the offloading Other APs other than the AP;
  • the first base station receives a handover response message returned by the second base station, where the handover response message includes RRC connection configuration information corresponding to the second base station;
  • the first base station sends a handover message to the UE, where the handover message includes RRC connection configuration information, wifi offload configuration information, and a handover policy corresponding to the second base station, where the UE is configured according to the RRC corresponding to the second base station.
  • the handover message includes RRC connection configuration information, wifi offload configuration information, and a handover policy corresponding to the second base station, where the UE is configured according to the RRC corresponding to the second base station.
  • Connecting configuration information, performing handover processing, according to the second base station pair The wifi offload configuration information is communicated with the AP that is discovered by the WLAN protocol, and the AP handover process is performed according to the handover policy corresponding to the second base station during the UE mobility.
  • a third aspect of the embodiments of the present invention provides a switching processing apparatus, including:
  • the transceiver module is configured to receive, by the first base station, a handover policy and wifi offload configuration information corresponding to the first base station, where the handover policy is used to indicate that the UE performs AP handover according to a roaming mechanism of the WLAN protocol;
  • a communication module configured to communicate with the first AP discovered through the WLAN protocol according to the wifi offload configuration information corresponding to the first base station;
  • a switching processing module configured to: when the device moves, acquire a second AP according to a handover policy corresponding to the first base station, associate with the first AP, and communicate with the second AP to implement an AP. Switching.
  • the wifi offload configuration information corresponding to the first base station includes a first ESSID
  • the device further includes:
  • a detecting module configured to detect whether the second ESSID corresponding to the second AP is the same as the first ESSID
  • the transceiver module is configured to: when the detecting module detects that the second ESSID is different from the first ESSID, send an indication message carrying the second ESSID to the first base station, where The first base station establishes a communication link and a traffic association with the wifi controller corresponding to the second ESSID.
  • the communications module is further configured to communicate with the second AP;
  • the transceiver module is configured to report the BSSID of the second AP to the first base station, so that the first base station establishes a communication link and a traffic association with the second AP according to the BSSID.
  • the transceiver module is further configured to: when the device is in the process of moving, if the second AP is not obtained according to the switching policy, and De-associating with the first AP, reporting wifi idle state information to the first base station, where the first base station stops establishing a communication link with the first base station according to the wifi idle state information.
  • the wifi controller or AP that is associated with the offloading sends wifi offload data.
  • the transceiver module is further configured to receive a handover cancellation sent by the first base station
  • the handover message includes: RRC connection configuration information corresponding to the second base station, where the RRC connection configuration information corresponding to the second base station is information obtained by the first base station and the second base station.
  • the handover processing module is further configured to perform handover processing according to the RRC connection configuration information corresponding to the second base station;
  • the communication module is further configured to communicate with the AP discovered by the WLAN protocol according to the wifi offload configuration information corresponding to the second base station;
  • the handover processing module is further configured to perform AP handover processing according to a handover policy corresponding to the second base station during the moving of the device.
  • the transceiver module is further configured to: when it is determined that the handover needs to be switched back to the LTE or the LTE is required to perform the offloading, the RRC connection establishment request is sent to the first base station. ;
  • the transceiver module is further configured to receive an RRC connection setup message that is returned by the first base station according to the RRC connection setup request, where the RRC connection setup message includes the wifi offload configuration information and the handover policy corresponding to the first base station.
  • the transceiver module is further configured to: return a wifi offload configuration reject message to the first base station, where the wifi offload configuration reject message includes a cause value;
  • the reason value is any one of the following: the wifi offload configuration information corresponding to the first base station is wifi offload configuration information sent by the eNB that does not accept access to the public land mobile network, and the UE has accessed Or preparing to access other APs other than the AP list in the wifi offload configuration information corresponding to the first base station, where the UE is performing wifi offload offloading but the current wifi shunt configuration information corresponding to the first base station.
  • the QoS/QoE of the service is smaller than the preset threshold, and the new WLAN service configuration information is added to the WLAN offload configuration information corresponding to the first base station, and the handover policy acquired by the UE from the ANDSF or the locally pre-stored handover policy is
  • the handover policy in the wifi offload configuration information corresponding to the first base station is different, the UE is in an emergency call state, the UE is receiving the MBMS service, and the application layer of the UE identifies that the current service is terminated within the expected time.
  • a fourth aspect of the embodiments of the present invention provides a switching processing apparatus, including:
  • a sending module configured to send a wifi offload request to the wifi controller or the AP
  • a receiving module configured to receive a wifi offload response returned by the wifi controller or the AP, to establish a communication link and a traffic association with the wifi controller or the AP
  • the sending module is further configured to send, according to the wifi offload response, the handover policy and the wifi offload configuration information corresponding to the first base station, to the UE, according to the wifi offload configuration information corresponding to the first base station, Communicating with the first AP discovered by the WLAN protocol, and when the UE moves, the UE acquires the second AP according to the handover policy corresponding to the first base station, and associates with the first AP, The second AP performs communication to implement handover of the AP;
  • the handover policy is used to instruct the UE to perform AP handover according to a roaming mechanism of the WLAN protocol.
  • the receiving module is further configured to receive an indication message that is sent by the UE and that carries a second ESSID, where the indication message is that the UE is detected according to the device. And an indication message sent to the device when the second ESSID corresponding to the second AP that is obtained by the corresponding switching policy is different from the first ESSID in the wifi offload configuration information corresponding to the device;
  • the device further comprises:
  • a establishing module configured to establish a communication link and a traffic association with the wifi controller corresponding to the second ESSID.
  • the receiving module is further configured to receive a BSSID that is reported by the UE, where the BSSID is that the UE is corresponding to the first base station. a BSSID corresponding to the second AP that is reported after the second AP communication is obtained by the handover policy;
  • the device further comprises:
  • a establishing module configured to establish a communication link and a traffic association with the second AP.
  • the receiving module is further configured to receive the wifi idle state information reported by the UE, and stop to and according to the wifi idle state information.
  • the first base station establishes a communication link and a wifi controller or an AP associated with the offloading to transmit wifi offload data.
  • the sending module is further configured to send a handover request message to the second base station,
  • the handover request message includes: wifi offload configuration information corresponding to the device, to indicate The second base station performs wifi offload configuration processing with the first AP or other APs according to the wifi offload configuration information corresponding to the device, where the other APs are associated with establishing a communication link and a traffic distribution with the device.
  • the receiving module is further configured to receive a handover response message that is returned by the second base station, where the handover response message includes RRC connection configuration information corresponding to the second base station;
  • the sending module is further configured to send a handover message to the UE, where the handover message includes RRC connection configuration information, wifi offload configuration information, and a handover policy corresponding to the second base station, where the UE corresponds to the second base station.
  • the RRC connection configuration information performing handover processing, communicating with the AP discovered by the WLAN protocol according to the wifi offload configuration information corresponding to the second base station, and following the second base station during the UE moving process
  • the corresponding switching policy performs AP switching processing.
  • a fifth aspect of the embodiments of the present invention provides a user equipment, including: a memory for storing an instruction; a processor coupled to the memory, the processor being configured to execute an instruction stored in the memory, And the processor is configured to perform the handover processing method as described in the first aspect above.
  • a sixth aspect of the embodiments of the present invention provides a base station, including: a memory, configured to store an instruction; a processor coupled to the memory, the processor configured to execute an instruction stored in the memory, and The processor is configured to perform the handover processing method as described in the second aspect above.
  • a seventh aspect of the embodiments of the present invention provides a handover processing system, including: a UE and a base station, where the UE is the handover processing apparatus according to the foregoing third aspect; The switching processing device described.
  • the handover processing method, the system, and the device the UE receives the handover policy and the wifi separation configuration information corresponding to the first base station, and the UE, according to the wifi offload configuration information corresponding to the first base station, and the WLAN
  • the first AP that is discovered by the protocol performs communication.
  • the UE acquires the second AP according to the handover policy corresponding to the first base station, associates with the first AP, and communicates with the second AP to implement AP handover.
  • the handover policy is used to indicate that the UE performs the AP handover according to the roaming mechanism of the WLAN protocol, that is, the UE only needs to implement the handover of the AP according to the handover policy, so that the UE must perform the AP handover according to the indication of the eNB in the prior art.
  • the UE performs the AP handover according to the roaming mechanism of the WLAN protocol, that is, the UE only needs to implement the handover of the AP according to the handover policy, so that the UE must perform the AP handover according to the indication of the eNB in the prior art.
  • there are more signaling interactions between the AP and the eNB and the UE so that there is a large cut.
  • the delay and signaling overhead problems are changed, thereby effectively improving the handover performance.
  • FIG. 1 is a schematic diagram of a wifi offload architecture of an eNB offloading based on the handover processing method of the present invention
  • FIG. 2 is a schematic diagram of a wifi offload architecture of a packet data network gateway (PDN Gateway; PGW for short) based on the handover processing method of the present invention
  • PDN Gateway packet data network gateway
  • FIG. 3 is a flowchart of an embodiment of a handover processing method according to the present invention.
  • FIG. 4 is a flowchart of still another embodiment of a handover processing method according to the present invention.
  • FIG. 5 is a flowchart of still another embodiment of a handover processing method according to the present invention.
  • FIG. 6 is a flowchart of still another embodiment of a handover processing method according to the present invention.
  • FIG. 7 is a schematic structural diagram of an embodiment of a handover processing apparatus according to the present invention.
  • FIG. 8 is a schematic structural diagram of another embodiment of a handover processing apparatus according to the present invention.
  • FIG. 9 is a schematic structural diagram of still another embodiment of a handover processing apparatus according to the present invention.
  • FIG. 10 is a schematic structural diagram of another embodiment of a handover processing apparatus according to the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
  • the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • FIG. 1 is a schematic diagram of a wifi offload architecture of an eNB offload based on a handover processing method according to the present invention.
  • FIG. 2 is a schematic diagram of a wifi offload architecture of a packet data network gateway (PDN Gateway; PGW for short) based on the handover processing method of the present invention, such as As shown in FIG. 1 and FIG. 2, when the wifi offloading and aggregation occurs in the PGW in the Evolved Packet Core (EPC), the PGW acts as an anchor for the wifi offload.
  • the eNB or RNC acts as an anchor for wifi offload.
  • the UE can have a wireless connection or wireless communication with LTE and wifi at the same time, or the UE has a wireless connection or wireless communication with UMTS and wifi at the same time.
  • the UE when the UE is in the RRC connection state (RRC_CONNECTED) and the wifi access point is associated with the UE, it is equivalent to performing an inter-system CA on the cellular network and wifi.
  • the UE may also be in the radio resource control idle state (RRC_IDLE) in the cellular network. In this case, all services of the UE need to communicate through wifi.
  • FIG. 3 is a flowchart of an embodiment of a handover processing method according to the present invention.
  • the method in this embodiment may include: Step 101: UE And receiving, by the first base station, a handover policy and wifi offload configuration information corresponding to the first base station, where the handover policy is used to indicate that the UE performs AP handover according to a roaming mechanism of the WLAN protocol.
  • Step 102 The UE communicates with the first AP discovered through the WLAN protocol according to the wifi offload configuration information corresponding to the first base station.
  • Step 103 The UE communicates with the first AP, and when the UE moves, the UE acquires the second AP according to the handover policy corresponding to the first base station, associates with the first AP, and communicates with the second AP. To achieve AP switching.
  • the UE measures, according to the handover policy, that the signal strength of the first AP is less than the first preset threshold and/or according to the first AP in the beacon. If the load is greater than the second preset threshold, and the signal strength of the second AP is greater than the first preset threshold and/or the load is less than the second preset threshold, the first AP is de-associated and communicates with the second AP. To achieve AP switching.
  • the UE receives the handover policy and the wifi separation configuration information corresponding to the first base station that is sent by the first base station, and the UE, according to the wifi offload configuration information corresponding to the first base station, and the first AP that is discovered through the WLAN protocol.
  • Communicating when the UE moves, the UE acquires the second AP according to the handover policy corresponding to the first base station, associates with the first AP, and communicates with the second AP to implement AP handover, because the handover policy is used to indicate the
  • the UE performs the AP handover according to the roaming mechanism of the WLAN protocol, that is, the UE only needs to implement the handover of the AP according to the handover policy during the UE mobility process.
  • the AP and the eNB are effectively caused by the UE in the prior art that the UE must perform the AP handover according to the indication of the eNB.
  • the UE must perform the AP handover according to the indication of the eNB.
  • the first base station directly establishes a communication link and a traffic association with the AP, that is, when there is no wifi controller, the wifi controller
  • the wifi controller For example, in the case of a wifi AC, a WAG, or a wifi router, after the step 103, the method may further include:
  • the UE communicates with the second AP, and reports a Basic Service Set Identifier (BSSID) of the second AP to the first base station, so that the first base station establishes a communication chain with the second AP according to the BSSID.
  • BSSID Basic Service Set Identifier
  • Roads are associated with shunts.
  • the method may further include:
  • the UE If the UE does not acquire the second AP according to the handover policy and is associated with the first AP, the UE reports the wifi idle state information to the first base station, so that the first base station stops according to the wifi idle state information. Establishing a communication link to the first base station and a wifi controller or an AP associated with the offloading to transmit wifi offload data.
  • the UE may report the wifi idle state information to the first base station, according to the wifi.
  • the idle state information stops the establishment of the communication link to the first base station and the wifi controller or the AP associated with the offloading to send the wifi offload data.
  • FIG. 4 is a flowchart of still another embodiment of a handover processing method according to the present invention. As shown in FIG. 4, the method includes:
  • Step 201 The UE receives the handover policy and the wifi offload configuration information corresponding to the first base station sent by the first base station, where the handover policy is used to indicate that the UE performs AP handover according to the roaming mechanism of the WLAN protocol.
  • Step 202 The UE communicates with the first AP discovered by using the WLAN protocol according to the wifi offload configuration information corresponding to the first base station.
  • the first base station is to the wifi controller, for example, a wifi access controller (Access Controller; abbreviation: AC), a wifi access gateway (WA Access Gateway; WAG), or a wifi router (router).
  • the wifi offload request message may include: a MAC address of the first base station, a GPRS Tunnel Protocol (GTP) end node identifier (Terminal Endpoint Identifier; TEID), The radio bearer ID (abbreviation: RB ID) to be offloaded, the quality of service (QoS) information of the radio bearer to be offloaded, the ESSID corresponding to the wifi AC, WAG, or wifi router.
  • GTP GPRS Tunnel Protocol
  • TEID Terminal Endpoint Identifier
  • RB ID The radio bearer ID (abbreviation: RB ID) to be offloaded, the quality of service (QoS) information of the radio bearer to be offloaded, the ESSID corresponding to the wifi AC, WAG, or wifi router.
  • the wifi AC, WAG or wifi router receives the wifi offload request message, and performs admission control, selects which RB IDs can be accepted for association, and establishes an RB ID and a wifi access category identifier (Access Category ID; AC ID for short).
  • the association relationship sends a wifi offload response message to the first base station, where the wifi offload response message may include: ESSID, GTP TEID, RB ID, AC ID and the like corresponding to the wifi AC, WAG or wifi router.
  • the wifi offload response message may further include: capability information of the wifi AC, WAG, or wifi router or supported wifi protocol version information.
  • the wifi AC, WAG or wifi router may also modify the quality of service information of the required offloaded radio bearer in the admission control, and the wifi offload response message further includes: the modified required shunt The quality of service carried by the radio, so that the first base station establishes a communication link and a shunt association with the wifi AC, WAG or wifi router.
  • each wifi AC, WAG or wifi router includes multiple APs.
  • the first base station sends the wifi offload configuration information corresponding to the first base station to the UE.
  • the wifi offload configuration information includes: an ESSID corresponding to the wifi AC, the WAG, or the wifi router (ie, the first ESSID), and the RB of the offloaded service ID and its corresponding AC ID, QoS information.
  • the UE establishes an RB of the LTE protocol stack according to the wifi offload configuration information corresponding to the first base station, and associates the access category AC, RB, and AC corresponding to the RB of the wifi, and returns the wifi to the first base station.
  • the message that the configuration is completed is offloaded.
  • the RB may be established in the LTE protocol stack in advance according to the WLAN offload configuration information corresponding to the first base station sent by the first base station.
  • the base station is not required to additionally reconfigure the RB through the RRC message.
  • the WLAN connection reconfiguration complete message (RRC Connection Reconfiguration Complete) message or the RRC connection setup complete message (RRC Connection Reestablishment Complete) or the RRC connection reestablishment complete message may be sent to the RRC connection reconfiguration complete message.
  • Base station The WLAN connection reconfiguration complete message (RRC Connection Reconfiguration Complete) message or the RRC connection setup complete message (RRC Connection Reestablishment Complete) or the RRC connection reestablishment complete message may be sent to the RRC connection reconfiguration complete message.
  • the UE discovers the first AP according to the WLAN protocol, authenticates, associates, or re-associates the first AP, and communicates with the first AP after the authentication and association succeeds.
  • UE can also pass LTE at the same time The protocol communicates with the first base station.
  • the first base station sends the wifi offload configuration information corresponding to the first base station to the UE, and the handover policy may be included in the same message, or sent by using different messages.
  • the first base station sends the handover policy after sending the wifi offload configuration information to the UE for a period of time according to whether the UE moves and the UE moving speed.
  • the first base station may further configure, in the wifi offload configuration information, the UE to measure and report information such as the received signal strength and the wifi load of the wifi, to assist the UE in performing AP discovery and selection.
  • the wifi offload configuration information and/or the handover policy may be an RRC Connection Reconfiguration message or an RRC Connection Reconfiguration message or an RRC Connection Setup message including Mobility Control Information.
  • a UE is transmitted by an RRC Connection Reestablishment message or the like.
  • Step 203 When the UE moves, the UE obtains the second AP according to the handover policy corresponding to the first base station, and associates with the first AP to communicate with the second AP to implement switching of the AP.
  • the UE discovers the second AP according to the handover policy, that is, according to the roaming mechanism of the WLAN protocol, and implements handover of the UE from the first AP to the second AP.
  • the AP is switched according to the FT protocol.
  • the wifi AC, WAG, or wifi router can complete the process of authentication, service data flow forwarding, etc., and follow WLAN roaming. protocol.
  • the first base station may assist the UE to perform AP discovery and selection according to information obtained by network deployment or 0AM or ANDSF or a recommended candidate target AP list sent to the UE according to the UE measurement report. Further reduce switching delay and save UE battery consumption.
  • Step 204 When detecting that the second ESSID corresponding to the second AP is different from the first ESSID, the UE sends an indication message carrying the second ESSID to the first base station, where the first base station and the first The wifi controller corresponding to the second ESSID establishes a communication link and a traffic distribution association.
  • the UE when the second ESSID corresponding to the second AP is different from the first ESSID, the AC, the WAG, or the router to which the second AP belongs is different from the AC, WAG, or router to which the first AP belongs, that is, the UE.
  • the UE does not move between the APs in the same ESS. Therefore, the UE needs to send an indication message carrying the second ESSID to the first base station, for the first base station and the second AP to belong to.
  • the wifi AC, WAG or wifi router establishes the communication link and the offload association.
  • the second base station may also report the second The BSSID of the AP is such that the first base station performs flow control. For example, the first base station determines that the traffic that is offloaded to the wifi network is reduced because the handover of the AP requires an interruption time.
  • the WLAN networking mode includes BSS, ESS, and Independent BSS (abbreviation: IBSS).
  • the BSSID represents a BSS and is the MAC address of the AP.
  • the coverage of BSS becomes the Basic Service Area (BSA).
  • the ESSID represents an ESS. Multiple APs in the ESS range have the same ESSID to support STA roaming. The switching process between different BSSs in the same ESS becomes roaming.
  • the wifi terminal generally becomes a STA, and the terminals supporting the cellular network and the wifi can be collectively referred to as a UE. Among them, wifi router, wifi AC and WAG belong to ESS.
  • the method may further include:
  • a handover message sent by the first base station includes: RRC connection configuration information corresponding to the second base station, where the RRC connection configuration information corresponding to the second base station is that the first base station interacts with the second base station The obtained information, the wifi offload configuration information and the handover policy corresponding to the second base station;
  • the UE performs handover processing according to the RRC connection configuration information corresponding to the second base station; the UE communicates with the AP discovered through the WLAN protocol according to the wifi offload configuration information corresponding to the second base station, and is in the UE moving process. And performing AP switching processing according to the switching policy corresponding to the second base station.
  • the UE Before receiving the handover message sent by the first base station, the UE sends a measurement report corresponding to the UE to the first base station according to the measurement configuration, where the measurement report corresponding to the UE includes a measurement report of the first base station and a neighboring base station with the first base station, and Wifi measurement report and other information.
  • the measurement report corresponding to the UE further includes: current wifi connection status information of the UE, for example, whether the UE has a wifi connection, a BSSID of the current wifi AP associated with the UE, and an ESSID of the ESS to which the UE belongs.
  • the first base station determines that the UE needs to be handed over to the second base station, it sends a handover request message to the second base station, where the handover request message includes: a WLAN offload configuration of the UE in the first base station, a current wifi connection state of the UE, and a handover policy.
  • the first base station may instruct the second base station and the first AP to perform wifi offload configuration or perform wifi offload configuration with other APs in the wifi offload configuration.
  • the second base station performs admission control, and sends a handover response message to the first base station, where the RRC connection configuration information, the wifi offload configuration information, and the handover policy corresponding to the second base station are included, and the second base station can perform wifi with the UE at the first base station.
  • the offloaded AP establishes an association and a communication link, so that after the base station switches, the second base station can continue to perform wifi offload with the first AP, or perform wifi offload with other APs.
  • the service data that the first AP does not successfully send and receive with the UE can be forwarded to the second base station by using the first base station, the second base station forwards the data to the second AP, or directly forwards to the second AP. .
  • the base station instructs the UE to perform inter-base station handover according to the LTE mobility management mechanism and perform AP handover according to the roaming mechanism of the WLAN protocol, and the mobility of the two is mutually independent.
  • the first base station when the base station is handed over, the first base station does not interact with the second base station, that is, the UE performs corresponding processing according to the wif offload configuration message and the handover policy corresponding to the first base station, and the UE may report the second after reaching the second base station.
  • the wifi information currently associated with the base station may not be reported.
  • the UE can notify the PGW when the ESS is switched through the wifi AC, WAG or wifi router. When the UE switches the AP within the same ESS, it may not need to notify the PGW.
  • the method may further include:
  • the UE When the UE determines that it needs to switch back to LTE or needs LTE to perform offloading, the UE sends an RRC connection establishment request to the first base station;
  • the UE receives the RRC connection setup message returned by the first base station according to the RRC connection setup request, and the RRC connection setup message includes the wifi offload configuration information and the handover policy corresponding to the first base station.
  • the wifi offload architecture of the PGW offloading is taken as an example.
  • the first base station instructs the UE to enter the RRC idle state (RRC_IDLE) state, and the wifi service can continue. .
  • the UE needs to complete the service in LTE, or the load of the first base station is high.
  • the first base station triggers an RRC Connection Release procedure to cause the UE to enter the RRC idle state on the LTE.
  • the AP UE performs AP handover according to the roaming mechanism of the WLAN protocol, for example: performing an FT handover procedure.
  • the second AP is heavily loaded, or the signal quality is poor, or there is no wifi coverage, the UE needs to switch back to LTE or needs LTE to perform offloading, and then initiates an RRC connection setup request to the first base station, and the RRC connection is established.
  • the request includes: a cause value, the cause value is a wifi offload request and a current wifi offload connection state.
  • the RRC connection setup request further includes: a measurement report, where the measurement report includes: the recommended AP list and its measurement information, such as: RSSI, load, and the like.
  • the first base station sends an RRC connection setup message to the UE in response to the RRC connection setup request of the UE, where the RRC connection setup message includes: the wifi offload configuration information and the handover policy corresponding to the first base station, and the UE connection establishment is completed.
  • the UE enters the RRC_CONNECTED state, and performs the wifi offloading and mobility management process according to the wifi offload configuration information and the handover policy corresponding to the first base station in the currently received RRC connection setup message.
  • the method may further include:
  • the UE returns a wifi offload configuration reject message to the first base station, where the wifi offload configuration reject message includes a cause value;
  • the reason value is any one of the following: the wifi offload configuration information corresponding to the first base station is the wifi offload configuration information sent by the eNB that the UE does not accept access to the public land mobile network, and the UE has accessed or is ready to access.
  • the QoS/QoE of the current service in the wifi offloading configuration information corresponding to the first base station is less than the pre-determination of the AP except the AP list in the wifi offload configuration information corresponding to the first base station.
  • the handover policy is different, the UE is in an emergency call state, the UE is receiving the MBMS service, and the application layer of the UE identifies that the current service is terminated within the expected time.
  • FIG. 5 is a flowchart of still another embodiment of a handover processing method according to the present invention. As shown in FIG. 5, the method includes:
  • Step 301 The first base station sends a wifi offload request to the wifi controller or the AP, and receives The wifi controller or the wifi shunt response returned by the AP to establish a communication link and a shunt association with the wifi controller or AP.
  • Step 302 The first base station sends, according to the wifi offload response, the handover policy and the wifi offload configuration information corresponding to the first base station, to the UE, according to the wifi offload configuration information corresponding to the first base station, and the discovery by using the WLAN protocol.
  • the first AP performs communication, and when the UE moves, the UE acquires the second AP according to the handover policy corresponding to the first base station, associates with the first AP, and communicates with the second AP to implement the AP. Switching.
  • the handover policy is used to indicate that the UE performs AP handover according to a roaming mechanism of the WLAN protocol.
  • the first base station sends a wifi offload request message to the wifi controller, for example, a wifi AC, a WAG, or a wifi router, where the wifi offload request message may include: a MAC address of the first base station, and a GPRS transmission protocol (GPRS) Tunnel Protocol; abbreviated as: GTP) Terminal Endpoint Identifier (TEID), Radio Bearer ID (RB ID) required for offloading, Quality of Service of the required offloaded radio bearer (Quality of Service; referred to as: QoS) information, wifi ID corresponding to wifi AC, WAG or wifi router.
  • GPRS GPRS transmission protocol
  • GTP GPRS transmission protocol
  • TEID Terminal Endpoint Identifier
  • RB ID Radio Bearer ID
  • QoS Quality of Service
  • the wifi AC, WAG or wifi router receives the wifi offload request message, and performs admission control, selects which RB IDs can be accepted for association, and establishes an RB ID and a wifi access category identifier (Access Category ID; AC ID for short).
  • the association relationship sends a wifi offload response message to the first base station, where the wifi offload response message may include: ESSID, GTP TEID, RB ID, AC ID and the like corresponding to the wifi AC, WAG or wifi router.
  • the wifi offload response message may further include: capability information of the wifi AC, WAG, or wifi router or supported wifi protocol version information.
  • the wifi AC, WAG or wifi router may also modify the quality of service information of the required offloaded radio bearer in the admission control, and the wifi offload response message further includes: the modified required shunt The quality of service carried by the radio, so that the first base station establishes a communication link and a shunt association with the wifi AC, WAG or wifi router.
  • each wifi AC, WAG or wifi router includes multiple APs.
  • the first base station sends the wifi offload configuration information corresponding to the first base station to the UE.
  • the wifi offload configuration information includes: wifi AC, WAG, or ESSID corresponding to the wifi router (ie, the first ESSID) , the RB ID of the offloaded service and its corresponding AC ID, QoS information.
  • the UE may perform the methods shown in the foregoing embodiments, and the implementation principles thereof are similar, and details are not described herein again.
  • the first base station sends a wifi offload request to the wifi controller or the AP, and receives a wifi shunt response returned by the wifi controller or the AP, and establishes a communication link and a shunt association with the wifi controller or the AP, and The base station sends the wifi offload configuration information and the handover policy corresponding to the first base station to the UE according to the wifi offload response, so that the UE communicates with the first AP discovered by the WLAN protocol according to the wifi offload configuration information corresponding to the first base station.
  • FIG. 6 is a flowchart of still another embodiment of the handover processing method of the present invention.
  • the method may further include:
  • Step 303 The first base station receives an indication message that is sent by the UE and carries a second ESSID, where the indication message is that the second ESSID corresponding to the second AP that is acquired by the UE according to the handover policy corresponding to the first base station is An indication message sent to the first base station when the first ESSID in the wifi offload configuration information corresponding to the first base station is different.
  • Step 304 The first base station establishes a communication link and a traffic association with the wifi controller corresponding to the second ESSID.
  • the method may further include:
  • the first base station receives the BSSID that is reported by the UE, and the BSSID is a BSSID corresponding to the second AP that is reported by the UE after being communicated with the second AP acquired by the handover policy corresponding to the first base station;
  • the first base station establishes a communication link and a traffic association with the second AP.
  • the method may further include:
  • the wifi idle state information received by the UE, and according to the wifi idle state
  • the state information stops transmitting wifi offload data to the wifi controller associated with establishing the communication link and the offload with the first base station.
  • the method may further include:
  • the first base station sends a handover request message to the second base station, where the handover request message includes: the wifi offload configuration information corresponding to the first base station, to indicate that the second base station according to the wifi offload configuration information corresponding to the first base station, and the The first AP or other AP performs wifi offload configuration processing; wherein the other AP refers to an AP other than the first AP under the wifi controller associated with the first base station to establish a communication link and a traffic offload;
  • the first base station sends a handover message to the UE, where the handover message includes the RRC connection configuration information, the wifi offload configuration information, and the handover policy corresponding to the second base station, where the UE performs the RRC connection configuration information corresponding to the second base station.
  • the handover process is performed according to the wifi offload configuration information corresponding to the second base station, and communicates with the AP discovered by the WLAN protocol, and performs AP handover processing according to the handover policy corresponding to the second base station during the UE mobility.
  • FIG. 7 is a schematic structural diagram of an embodiment of a handover processing apparatus according to the present invention.
  • the apparatus includes: a transceiver module 11, a communication module 12, and a handover processing module 13; wherein, the transceiver module 11 is configured to receive the first base station to send The first base station corresponding to the handover policy and the wifi offload configuration information; wherein the handover policy is used to indicate that the UE performs the AP handover according to the roaming mechanism of the WLAN protocol; the communication module 12 is configured to configure the wifi offload corresponding to the first base station The information is communicated with the first AP that is discovered by using the WLAN protocol.
  • the handover processing module 13 is configured to acquire, according to the handover policy corresponding to the first base station, the second AP, to be associated with the first AP, and The second AP communicates to implement handover of the AP.
  • the device in this embodiment may be a UE, and may implement the technical solution of the method embodiment shown in FIG. 3, and the implementation principles thereof are similar, and details are not described herein again.
  • the UE receives the handover policy and the wifi separation configuration information corresponding to the first base station that is sent by the first base station, and the UE, according to the wifi offload configuration information corresponding to the first base station, and the first AP that is discovered through the WLAN protocol.
  • Communicating when the UE moves, the UE acquires the second AP according to the handover policy corresponding to the first base station, associates with the first AP, and communicates with the second AP to implement AP handover, because the handover policy is used to indicate the UE roaming mechanism according to WLAN protocol
  • the AP is switched, that is, the AP is required to perform the handover of the AP according to the handover policy. Therefore, the signaling interaction between the AP and the eNB and the UE is caused by the UE in the prior art. There are many, so there is a large problem of handover delay and signaling overhead, thereby effectively improving handover performance.
  • FIG. 8 is a schematic structural diagram of another embodiment of a handover processing apparatus according to the present invention.
  • the transceiver module 11 is further configured to return a WiFi shunt to the first base station.
  • Configuring a reject message, the wifi offload configuration reject message includes a cause value;
  • the reason value is any one of the following: the wifi offload configuration information corresponding to the first base station is the wifi offload configuration information sent by the eNB that the UE does not accept access to the public land mobile network, and the UE has accessed or is ready to access.
  • the QoS/QoE of the current service in the wifi offloading configuration information corresponding to the first base station is less than the pre-determination of the AP except the AP list in the wifi offload configuration information corresponding to the first base station.
  • the handover policy is different, the UE is in an emergency call state, the UE is receiving the MBMS service, and the application layer of the UE identifies that the current service is terminated within the expected time.
  • the apparatus when the first ESSID is included in the wifi offload configuration information corresponding to the first base station, the apparatus further includes: the detecting module 14 is configured to detect whether the second ESSID corresponding to the second AP is the same as the first ESSID; The transceiver module 11 is configured to: when the detecting module 14 detects that the second ESSID is different from the first ESSID, send an indication message carrying the second ESSID to the first base station, where the first base station and the first base station The wifi controller corresponding to the second ESSID establishes a communication link and a traffic distribution association.
  • the communication module 12 is further configured to communicate with the second AP; the transceiver module 11 is configured to report the BSSID of the second AP to the first base station, according to the BSSID, and the first base station The second AP establishes a communication link and a traffic association
  • the transceiver module 11 is further configured to: when the device is in the process of moving, if the switching policy is not obtained, And the second AP is associated with the first AP, and the wifi idle state information is reported to the first base station, so that the first base station stops establishing a communication link and the offload with the first base station according to the wifi idle state information.
  • the associated wifi controller or AP sends wifi offload data.
  • the transceiver module 11 is further configured to receive a handover message sent by the first base station, where the handover message includes: RRC connection configuration information corresponding to the second base station, where the RRC connection configuration information corresponding to the second base station is The information obtained by the first base station and the second base station, the wifi split configuration information and the handover policy corresponding to the second base station; the handover processing module 13 is further configured to perform handover processing according to the RRC connection configuration information corresponding to the second base station.
  • the communication module 12 is further configured to communicate with the AP discovered by the WLAN protocol according to the wifi offload configuration information corresponding to the second base station; the handover processing module 13 is further configured to follow the second during the moving of the device.
  • the handover policy corresponding to the base station performs AP handover processing.
  • the transceiver module 11 is further configured to: when it is determined that the handover needs to be switched back to the LTE or the LTE is required to be offloaded, the first The base station sends an RRC connection setup request; the transceiver module 11 is further configured to receive an RRC connection setup message that is returned by the first base station according to the RRC connection setup request, where the RRC connection setup message includes the wifi offload configuration information corresponding to the first base station, Switch strategy.
  • FIG. 9 is a schematic structural diagram of still another embodiment of a handover processing apparatus according to the present invention.
  • the apparatus includes: a sending module 21 and a receiving module 22; wherein, the sending module 21 is configured to send a wifi to a wifi controller or an AP.
  • the receiving module 22 is configured to receive a wifi shunt response returned by the wifi controller or the AP to establish a communication link and a shunt association with the wifi controller or the AP; the sending module 21 is further configured to respond according to the wifi shunt response.
  • the UE Transmitting the handover policy and the wifi offload configuration information corresponding to the first base station to the UE, where the UE communicates with the first AP discovered through the WLAN protocol according to the wifi offload configuration information corresponding to the first base station, and moves in the UE
  • the UE obtains the second AP according to the handover policy corresponding to the first base station, and is associated with the first AP, and communicates with the second AP to implement the handover of the AP.
  • the handover policy is used to indicate the The UE performs AP handover according to the roaming mechanism of the WLAN protocol.
  • the device in this embodiment may be specifically the first base station, and may perform the method in the embodiment shown in FIG. 5, and the implementation principles thereof are similar, and details are not described herein again.
  • the first base station sends a wifi offload request to the wifi controller or the AP, and receives a wifi shunt response returned by the wifi controller or the AP, and establishes a communication link and a shunt association with the wifi controller or the AP, and The base station sends the wifi offload configuration information and the handover policy corresponding to the first base station to the UE according to the wifi offload response, so that the UE communicates with the first AP discovered by the WLAN protocol according to the wifi offload configuration information corresponding to the first base station.
  • the AP switching process is performed according to the handover policy corresponding to the first base station, and the handover policy is used to indicate that the UE performs the AP handover according to the roaming mechanism of the WLAN protocol, that is, the UE only needs to implement the handover of the AP according to the handover policy. Therefore, the problem that the UE must perform the AP handover according to the eNB indication, and the signaling interaction between the AP and the eNB and the UE is more, so that there is a large handover delay and signaling overhead problem, thereby effectively solving the problem. Improved switching performance.
  • FIG. 10 is a schematic structural diagram of another embodiment of a handover processing apparatus according to the present invention.
  • the receiving module 22 is further configured to receive a carried by the UE.
  • An indication message of the second ESSID where the indication message is that the second ESSID corresponding to the second AP acquired by the UE according to the handover policy corresponding to the device is different from the first ESSID in the wifi offload configuration information corresponding to the device
  • the device further includes: an establishing module 23 configured to establish a communication link and a traffic association with the wifi controller corresponding to the second ESSID.
  • the receiving module 22 is further configured to receive a BSSID reported by the UE, where the BSSID is that the UE is in accordance with the first The BSSID corresponding to the second AP reported by the second AP after the second AP is obtained by the handover policy of the base station.
  • the device further includes: an establishing module, configured to establish a communication link and a traffic association with the second AP.
  • the receiving module 22 is further configured to receive the wifi idle state information reported by the UE, and according to the wifi idle state information. Stop sending wifi offload data to the wifi controller or AP associated with the first base station to establish a communication link and offload.
  • the sending module 21 is further configured to send, to the second base station, a handover request message, where the handover request message includes: wifi offload configuration information corresponding to the device, to indicate that the second base station according to the wifi offload configuration information corresponding to the device And performing the wifi offloading configuration process with the first AP or other APs, where the other APs are other APs other than the first AP under the wifi controller associated with establishing the communication link and the offloading with the device;
  • the receiving module 22 is further configured to receive a handover response message that is returned by the second base station, where the handover response message includes RRC connection configuration information corresponding to the second base station, and the sending module 21 is further configured to send a handover message to the UE, where the handover message is sent.
  • the wifi offload configuration information is communicated with the AP discovered by the WLAN protocol, and during the UE mobility, the AP handover process is performed according to the handover policy corresponding to the second base station.
  • the present invention also provides a user equipment, comprising: a memory for storing instructions; a processor coupled to the memory, the processor being configured to execute instructions stored in the memory, and the processor It is configured to perform the switching processing method as described in FIG. 3 or FIG.
  • a user equipment comprising: a memory for storing instructions; a processor coupled to the memory, the processor being configured to execute instructions stored in the memory, and the processor It is configured to perform the switching processing method as described in FIG. 3 or FIG.
  • the implementation principle is similar and will not be described here.
  • the present invention also provides a base station, comprising: a memory for storing an instruction; a processor coupled to the memory, the processor configured to execute an instruction stored in the memory, and the processor is It is configured to perform the handover processing method as described in FIG. 5 or FIG. 6.
  • a base station comprising: a memory for storing an instruction; a processor coupled to the memory, the processor configured to execute an instruction stored in the memory, and the processor is It is configured to perform the handover processing method as described in FIG. 5 or FIG. 6.
  • the implementation principle is similar, and will not be described here.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

L'invention concerne un procédé, un système et un dispositif de traitement de commutation. Le procédé comporte les étapes consistant à : recevoir, par le biais d'un équipement utilisateur (EU), une politique de commutation et des informations de configuration de shuntage à technologie de réseau sans fil (wifi) qui correspondent à une première station de base, qui sont envoyées par la première station de base, la politique de commutation servant à indiquer que l'EU effectue une commutation de point d'accès (PA) en fonction d'un mécanisme d'itinérance d'un protocole de réseau local sans fil (WLAN) (101) ; en fonction des informations de configuration de shuntage wifi qui correspondent à la première station de base, communiquer, par le biais de l'EU, avec un premier PA découvert par le protocole WLAN ; et communiquer, par le biais de l'EU, avec le premier PA, et quand l'EU se déplace, acquérir, par le biais de l'EU, un deuxième PA en fonction de la politique de commutation qui correspond à la première station de base, effectuer une décorrélation avec le premier PA, et communiquer avec le deuxième PA de manière à réaliser une commutation de PA (103).
PCT/CN2013/087870 2013-11-26 2013-11-26 Procédé, système et dispositif de traitement de commutation WO2015077923A1 (fr)

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CN102438289A (zh) * 2011-12-26 2012-05-02 中国电信股份有限公司 Wi-Fi导流方法、装置及移动终端
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EP4204851A4 (fr) * 2020-08-31 2024-02-21 Cognitive Systems Corp Commande de topologie de mouvement dans un réseau de communication sans fil standardisé
WO2023029601A1 (fr) * 2021-08-30 2023-03-09 华为技术有限公司 Procédé et appareil de commande d'itinérance de terminal, ainsi que procédé et appareil de génération de bibliothèque de politiques d'itinérance

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