WO2014012454A1 - 一种承载切换的方法、系统和设备 - Google Patents

一种承载切换的方法、系统和设备 Download PDF

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Publication number
WO2014012454A1
WO2014012454A1 PCT/CN2013/079178 CN2013079178W WO2014012454A1 WO 2014012454 A1 WO2014012454 A1 WO 2014012454A1 CN 2013079178 W CN2013079178 W CN 2013079178W WO 2014012454 A1 WO2014012454 A1 WO 2014012454A1
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WIPO (PCT)
Prior art keywords
bearer
base station
user equipment
switching
macro base
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PCT/CN2013/079178
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English (en)
French (fr)
Inventor
梁靖
付喆
赵亚利
彦楠
Original Assignee
电信科学技术研究院
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Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Publication of WO2014012454A1 publication Critical patent/WO2014012454A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0079Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/04Reselecting a cell layer in multi-layered cells

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method, system, and device for bearer switching. Background technique
  • the E-UTRAN is composed of an evolved base station (e B ).
  • the Mobility Management Entity is connected to the eNB by using an S I -MME interface; the eNB completes the access network function and communicates with the user equipment (UE) through the air interface. For each UE attached to the network, there is one MME serving it, and the MME is called the serving MME of the UE.
  • the S 1-MME interface provides the UE with control plane services, including mobility management and Data Radio Bearer (DRB) management functions.
  • DRB Data Radio Bearer
  • the Serving GW is connected to the eNB by using an S1-U interface. For each UE attached to the network, there is an S-GW serving the UE.
  • the S-GW is called a UE.
  • Service S-GW is called a UE.
  • the S lU interface provides a user plane service for the UE, and the user plane data of the UE is transmitted between the S-GW and the eNB through a General Packet Radio Service (GPRS) tunneling protocol S lU GTP (GPRS Tunneling Protocol, GTP) DRB. .
  • GPRS General Packet Radio Service
  • the user plane protocol stack between the UE and the network is shown in Figure 2.
  • the control plane protocol stack is shown in Figure 3.
  • the user plane protocol includes Packet Data Convergence Protocol (PDCP) and radio link control (Radio Link). Control, RLC), Medium Access Control (MAC) and Physical Layer (PHY); Control plane protocols include Radio Resource Control (RRC) and Non-Access Stratum (NAS)
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link control
  • MAC Medium Access Control
  • PHY Physical Layer
  • Control plane protocols include Radio Resource Control (RRC) and Non-Access Stratum (NAS)
  • RRC layer message needs to be processed by the user plane protocol layer, and then transmitted in the air interface; the NAS layer message is transmitted in the air interface encapsulation in the RRC message; and the S1 -MME interface is transmitted on the S1 connection.
  • RRC Radio Resource Control
  • NAS Non-Access Stratum
  • the RRC/PDCP/RLC/MAC/PHY peer layer of the UE is located in the same eNB, and the NAS layer peer layer of the UE is located in the same eNB as that established for the UE.
  • S 1 is connected to the MME.
  • the PDCP and the RLC entity correspond to a Data Radio Bearer (DRB)/Signal Radio Bearer (SRB) 1/SRB2, and each DRB and SRB 1 and SRB2 respectively correspond to one.
  • DRB Data Radio Bearer
  • SRB Synignal Radio Bearer
  • Set of PDCP and RLC entities; DRB/SRB 1/SRB2 are aggregated at the MAC layer. Therefore, the UE will be composed of multiple sets at the same time.
  • PDCP and RLC entities but only one MAC layer and physical layer entity.
  • a macro cell provides a basic coverage
  • a local cell provides hotspot coverage
  • a data/signaling interface exists between the Local Cell and the Macro Cell (wired/ The radio interface)
  • the UE can work under the Macro eNB or the Local eNB.
  • the Local eNB Since the cell controlled by the Local eNB has a small coverage and has fewer UEs, it is connected to the Local eNB.
  • the UEs often get better service shields, such as: Get higher service rates, higher shield links. Therefore, when the UE connected to the Macro eNB approaches the cell controlled by the Local eNB, it can switch to the Local eNB to obtain the service provided by the Local eNB; when the UE is away from the cell controlled by the Local eNB, it needs to switch to the cell controlled by the Macro eNB. To maintain a wireless connection. Due to the large number of Local eNBs and small coverage, the UE needs to frequently switch between the Macro eNB cell and the Local eNB cell.
  • the UE In the case where the UE user plane and the control plane are not separated, the UE only has a connection with the macro eNB, as shown in FIG.
  • a network deployment mode in which the user plane and the control plane are separated is introduced.
  • a method, a system, and a device for carrying a handover are provided in the embodiment of the present invention to provide a processing solution for a UE to fail in a bearer transfer process in a layered network deployment scenario in which a user plane and a control plane are separated.
  • the user equipment determines that the bearer handover failure occurs when the bearer is handed over to the local base station
  • the user equipment maintains the bearer at the macro base station or switches to another local base station.
  • the macro base station determines that the user equipment fails to perform handover when the bearer is handed over to the local base station;
  • the macro base station keeps the bearer of the user equipment at the macro base station or switches the bearer of the user equipment to another local base station.
  • a user equipment for carrying handover is provided by the embodiment of the present invention, including:
  • a first determining module configured to determine that a bearer switching failure occurs when the bearer is switched to the local base station
  • the first processing module is configured to keep the bearer in the macro base station or switch to another local base station.
  • a macro base station carrying handover is provided in the embodiment of the present invention, including:
  • a bearer switching system provided by an embodiment of the present invention includes:
  • a macro base station configured to determine that a user equipment fails to perform handover handover when the bearer is switched to the local base station, and the bearer of the user equipment is maintained at the macro base station or the bearer of the user equipment is switched to another local base station;
  • the user equipment is configured to determine that a bearer handover failure occurs when the bearer is handed over to the local base station, and the bearer is maintained at the macro base station or switched to another local base station.
  • the bearer handover failure occurs when the user equipment switches the bearer to the local base station, the bearer is kept at the macro base station or switched to another local base station, so that the UE can be transferred in the layered network deployment scenario in which the user plane and the control plane are separated. Failures occur during processing to improve system performance.
  • FIG. 1 is a schematic diagram of a network architecture of an E-UTRAN in the background art
  • FIG. 2 is a schematic diagram of a user plane protocol stack between a UE and a network in the background art
  • FIG. 3 is a schematic diagram of a control plane protocol stack between a UE and a network in the background art
  • FIG. 4 is a schematic diagram of a layered network deployment scenario in the background art
  • FIG. 5 is a schematic diagram of a UE having only an air interface with a macro e B in the background art
  • FIG. 6 is a schematic diagram of an air interface connection between a first UE and two eNBs according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of air interface connection between a second UE and two eNBs according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a system for bearer switching according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a network side device according to an embodiment of the present invention.
  • FIG. 11 is a schematic flowchart of a method for a user equipment to perform bearer switching according to an embodiment of the present invention
  • FIG. 12 is a schematic flowchart of a method for performing bearer switching by a network side device according to an embodiment of the present invention
  • FIG. 13 is a schematic flowchart of a method for processing a radio bearer (RB) handover failure according to an embodiment of the present invention
  • FIG. 14 is a schematic flowchart of a method for processing RB handover failure according to a second embodiment of the present invention.
  • 15 is a schematic flowchart of a method for processing a third RB handover failure according to an embodiment of the present invention.
  • FIG. 16 is a schematic flowchart of a method for processing a RB handover failure according to a fourth embodiment of the present invention. detailed description
  • the bearer handover failure occurs when the user equipment switches the bearer to the local base station
  • the bearer is kept at the macro base station or switched to another local base station, so that the UE can be deployed in a hierarchical network deployment scenario separated from the user plane and the control plane. Failure occurs during the bearer transfer process to improve system performance.
  • the bearer switching in the embodiment of the present invention is only a Data Radio Bearer (DRB) switch; Or bearer handover has DRB and Signal Radio Bearer (SRB) handover.
  • DRB Data Radio Bearer
  • SRB Signal Radio Bearer
  • the UE user plane and the control plane are separated, and the UE is simultaneously connected to the two e Bs.
  • the two air interface connections are shown in Figure 6 and Figure 7.
  • the system for carrying handover in the embodiment of the present invention includes: a macro base station 10 and a user equipment 20.
  • the macro base station 10 is configured to determine that the user equipment fails to perform handover when the bearer is switched to the local base station; the bearer of the user equipment is kept at the macro base station or the bearer of the user equipment is switched to another local base station;
  • the user equipment 20 is configured to determine that a bearer handover failure occurs when the bearer is handed over to the local base station, and the bearer is held at the macro base station or switched to another local base station.
  • the macro base station 10 and the user equipment 20 determine that there are many ways in which the user equipment fails to bear the handover when the bearer is switched to the local base station, and several types are listed below.
  • the macro base station 10 and the user equipment 20 each maintain a timer.
  • the macro base station 10 does not receive the RB handover response message from the user equipment after the handover timer expires, and determines that the bearer handover failure occurs when the user equipment switches the bearer to the local base station.
  • the user equipment 20 does not successfully access the local base station after the handover timer expires, and determines that the bearer handover failure occurs when the bearer is switched to the local base station.
  • the macro base station 10 notifies the user equipment 20 of the duration of the handover timer; correspondingly, the user equipment 20 sets the handover timer according to the duration notified by the macro base station 10.
  • the macro base station 10 can notify the user equipment 20 of the duration of the handover timer by using a bearer handover command.
  • the user equipment 20 maintains a timer.
  • the user equipment 20 does not successfully access the local base station after the handover timer expires, and determines that the bearer handover failure occurs when the bearer is switched to the local base station;
  • the user equipment 20 reports the bearer handover failure to the macro base station 10.
  • the macro base station 10 determines that the user equipment 20 fails to perform handover handover when the bearer is handed over to the local base station. .
  • the macro base station 10 notifies the user equipment 20 of the duration of the handover timer; correspondingly, the user equipment 20 sets the handover timer according to the duration notified by the macro base station 10.
  • the macro base station 10 can notify the user equipment 20 of the duration of the handover timer by using a bearer handover command.
  • Mode 3 The macro base station 10 maintains a timer. Specifically, the macro base station 10 does not receive the RB handover response message from the user equipment after the handover timer expires, and determines that the user equipment 20 fails to perform bearer handover when the bearer is switched to the local base station;
  • the macro base station 10 notifies the user equipment 20 that the handover fails.
  • the user equipment 20 determines that the bearer handover failure occurs when the bearer is handed over to the local base station.
  • the macro base station 10 restores the user equipment.
  • the user equipment 20 After the user equipment 20 resumes the DRB configuration of the macro base station 10 before the bearer handover, the user equipment 20 can also resume the DRB transmission with the macro base station 10;
  • the macro base station 10 resumes the DRB configuration of the macro base station 10 before the user equipment 20 bears the handover, the macro base station 1 resumes the DRB transmission with the user equipment 20.
  • the macro base station 10 notifies the user equipment 20 to initiate access to the standby local base station, and the user equipment 20 receives the RB reconfiguration message from the macro base station 10. After that, the access is initiated to the alternate local base station.
  • the macro base station 10 determines that the user equipment may delete the context of the user equipment and release the radio resources allocated for the user equipment after the bearer handover failure occurs when the bearer is handed over to the local base station.
  • the macro base station and the local base station may be other types of network side nodes, such as an evolved base station, a home base station, a relay node (RN), a micro base station (pico), and a remote radio head (RRH).
  • network side nodes such as an evolved base station, a home base station, a relay node (RN), a micro base station (pico), and a remote radio head (RRH).
  • RN relay node
  • pico micro base station
  • RRH remote radio head
  • the user equipment in the embodiment of the present invention includes: a first determining module 900 and a first processing module 910.
  • the first determining module 900 is configured to determine that a bearer handover failure occurs when the bearer is switched to the local base station, where the first processing module 910 is configured to keep the bearer in the macro base station or switch to another local base station.
  • the first determining module 900 can be implemented by a processor
  • the first processing module 910 can be implemented by a processor.
  • the first determining module 900 does not successfully access the local base station after the handover timer expires, determines that the bearer handover fails when the bearer is switched to the local base station; or after receiving the notification that the bearer handover failure from the macro base station fails , determining that a bearer handover failure occurs when the bearer is handed over to the local base station.
  • the first determining module 900 sets a switching timer according to the duration of the macro base station notification.
  • the first determining module 900 does not successfully access the local base station after the handover timer expires, and determines that the bearer handover failure is reported to the macro base station after the bearer handover failure occurs when the bearer is switched to the local base station.
  • the first processing module 910 maintains the bearer at the macro base station according to the following manner:
  • the first processing module 910 resumes the DRB transmission with the macro base station after the DRB configuration of the macro base station before the bearer handover.
  • the first processing module 910 switches the bearer to another local base station according to the following manner: After receiving the RB reconfiguration message from the macro base station, the first localization module 910 initiates the access to the standby local base station.
  • the network side device of the embodiment of the present invention includes: a second determining module 1010 and a second processing module 1011.
  • the second determining module 1010 is configured to determine that the user equipment fails to perform handover when the bearer is switched to the local base station;
  • the second processing module 1011 is configured to keep the bearer of the user equipment at the macro base station or switch the bearer of the user equipment to another local base station.
  • the second determining module 1010 can be implemented by a processor.
  • the second processing module 1011 can be implemented by a processor.
  • the second determining module 1010 does not receive the RB handover response message from the user equipment after the handover timer expires, and determines that the user equipment fails to perform handover when the bearer is switched to the local base station; or receives the user equipment from the user equipment. After the RB handover failure message, it is determined that the user equipment fails to bear handover when the bearer is switched to the local base station.
  • the second determining module 1010 notifies the user of the duration of the device switching timer.
  • the second processing module 1011 maintains the bearer of the user equipment in the macro base station according to the following manner: Restoring the DRB configuration of the macro base station before the user equipment bears the handover.
  • the second processing module 1011 resumes the DRB transmission with the user equipment after the DRB configuration of the macro base station before the user equipment bears the handover.
  • the second processing module 1011 switches the bearer of the user equipment to another local base station according to the following manner: Notifying the user equipment to initiate access to the standby local base station.
  • the second processing module 1011 determines that the user equipment deletes the context of the user equipment and releases the radio resources allocated for the user equipment after the bearer handover fails after the bearer is switched to the local base station.
  • the embodiment of the present invention further provides a method for a user equipment to perform bearer handover and a method for a network side device to perform bearer handover.
  • the principle of solving the problem is similar to the system for carrying handover in the embodiment of the present invention. Therefore, the implementation of these methods can be referred to the implementation of the system, and the repeated description will not be repeated.
  • the method for performing bearer handover by a user equipment includes the following steps: Step 1101: A user equipment determines that a bearer handover failure occurs when a bearer is switched to a local base station.
  • Step 1102 The user equipment keeps the bearer in the macro base station or switches to another local base station.
  • the user equipment fails to access the local base station after the handover timer expires, and determines that the bearer handover failure occurs when the bearer is switched to the local base station; or
  • the user equipment After receiving the notification of the bearer handover failure from the macro base station, the user equipment determines that the bearer handover failure occurs when the bearer is handed over to the local base station.
  • the method further includes: The user equipment sets a switching timer according to the length of time notified by the macro base station.
  • the user equipment does not successfully access the local base station after the handover timer expires, and determines that the bearer handover failure is reported to the macro base station after the bearer handover failure occurs when the bearer is switched to the local base station.
  • the user equipment maintains the bearer in the macro base station, including:
  • the user equipment resumes the DRB configuration at the macro base station before the bearer handover.
  • the DRB transmission with the macro base station can also be resumed.
  • the user equipment switches the bearer to other local base stations, including:
  • the method for performing bearer handover by the network side device includes the following steps: Step 1201: The macro base station determines that the user equipment fails to perform bearer handover when the bearer is switched to the local base station; Step 1202: The macro base station user The bearer of the device remains at the macro base station or switches the bearer of the user equipment to other local base stations.
  • the macro base station does not receive the RB handover response message from the user equipment after the handover timer expires, and determines that the user equipment fails to perform handover when the bearer is handed over to the local base station; or
  • the macro base station After receiving the RB handover failure message from the user equipment, the macro base station determines that the handover of the bearer occurs when the user equipment switches the bearer to the local base station.
  • the macro base station notifies the user equipment of the duration of the handover timer.
  • the macro base station maintains the bearer of the user equipment in the macro base station, including:
  • the macro base station resumes the DRB configuration of the macro base station before the user equipment carries the handover.
  • the DRB transmission with the user equipment can also be resumed.
  • the macro base station switches the bearer of the user equipment to another local base station, including:
  • the macro base station notifies the user equipment to initiate access to the alternate local base station.
  • the macro base station determines that the user equipment deletes the context of the user equipment and releases the radio resources allocated for the user equipment after the bearer handover failure occurs when the bearer is switched to the local base station.
  • the UE receives the "RB handover command" sent by the macro e B, where the message includes the identifier of the target local eNB, the DRB identifier to be transferred (or an indication that all DRBs are transferred), and the corresponding radio resource configuration information (corresponding to FIG. 6).
  • the message carries a timer length.
  • the UE After receiving the message, the UE starts a timer and initiates access to the local eNB according to the indication in the message.
  • the RB handover command may be a newly defined RRC message, or may reuse a current RRC message, such as an RRC connection reconfiguration message.
  • the UE If the UE still fails to access the local eNB when the timer expires, the UE considers that the RB handover fails, and then the UE sends an "RB handover failure" message to the macro eNB to notify the macro eNB that the message can be further carried. The reason for the switch failure or the DRB ID. At the same time, the UE restores the previous DRB-related configuration, and the DRB that has not successfully switched remains on the macro eNB. After receiving the "RB handover failure" message, the Macro eNB resumes the previous DRB configuration of the UE, and continues to provide all DRB transmissions for the UE under the local eNB. At the same time, the macro eNB notifies the local eNB that the current RB handover fails, and the local eNB deletes the context of the UE and releases the radio resources previously prepared for the UE.
  • Step 1301 The Macro eNB sends an RN handover command to the UE.
  • Step 1302 The UE initiates an access to the local eNB.
  • Step 1303 The UE determines that access to the local eNB fails.
  • Step 1304 The UE sends an RN handover failure message to the IMacro eNB.
  • Step 1305 The UE restores the DRB configuration in the Macro eNB, and the Macro eNB restores the DRN configuration for the user equipment.
  • Step 1306 The Macro eNB notifies the local eNB to release the resources of the UE.
  • Step 1307 The local eNB releases the UE context and the radio resources allocated for the UE.
  • the UE receives the "RB handover command" sent by the macro eNB, where the message includes the identifier of the target local eNB, the DRB identifier to be transferred (or the indication that all DRBs are transferred), and the corresponding radio resource configuration information (corresponding to FIG. 6 The scenario), while the message carries a timer length.
  • the Marco eNB sends the "RB handover command”
  • the corresponding timer is started.
  • the UE starts the timer and initiates access to the local eNB according to the indication in the message.
  • the RB handover command may be a newly defined RRC message, or may reuse the current RRC message, such as an RRC connection reconfiguration message.
  • the UE For the UE, if the UE still fails to access the local eNB when the timer expires, the UE considers that the RB handover fails, and releases the configuration information of the Local eNB by itself, and restores the DRB configuration of the previous Marco eNB.
  • the Marco eNB For the Marco eNB, if the "RB Handover Response" message fed back by the UE has not been received when the timer of the Marco eNB expires, the bearer separation is considered to have failed.
  • the Marco eNB can restore the DRB related configuration before the UE is restored, and continue to provide all DRB transmissions for the UE under the local eNB.
  • the macro eNB notifies the local eNB that the current RB handover fails, and the local eNB deletes the context of the UE and releases the radio resources previously prepared for the UE.
  • Step 1401 The Macro eNB sends an RN handover command to the UE.
  • Step 1402 The UE initiates an access to the local eNB.
  • Step 1403 The UE determines that the access to the local eNB fails, and the Macro eNB determines that the access to the local eNB fails.
  • Step 1404 the UE restores the DRB configuration in the Macro eNB, and the Macro eNB restores the DRN configuration for the user equipment.
  • Step 1405 The Macro eNB notifies the local eNB to release the resources of the UE.
  • Step 1406 The local eNB releases the UE context and the radio resources allocated for the UE.
  • the SRB handover of the UE is also triggered by the RB handover command.
  • the UE receives the "RB handover command" sent by the macro eNB, where the message includes the identifier of the target local eNB, the DRB identifier to be transferred (or the indication that all DRBs are transferred), and the corresponding radio resource configuration information, and the message carries A timer length, and an indication that the UE is required to establish an SRB at the local eNB (the SRB is only used to transmit local eNB radio resource management and bearer management related information, corresponding to the scenario in FIG. 7).
  • the UE starts a timer and initiates access to the local eNB according to the indication in the message.
  • the RB handover command may be a newly defined RRC message, or may reuse the current RRC message, such as an RRC connection reconfiguration message.
  • the UE If the UE still fails to access the local eNB when the timer expires, the UE considers that both the SRB and the DRB fail to be handed over, and then the UE sends an "RB handover failure" message to the macro eNB to notify the macro eNB, in the message.
  • the reason for the handover failure or the SRB, the DRB identifier, and the like may be further carried.
  • the UE restores the previous DRB-related configuration, and the DRB that has not successfully switched remains on the macro eNB.
  • the Macro eNB After receiving the "RB handover failure" message, the Macro eNB resumes the previous DRB configuration of the UE, and continues to provide all DRB transmissions for the UE under the local eNB.
  • the macro eNB notifies the local eNB that the current DRB and SRB handover fails, and the local eNB deletes the context of the UE and releases the radio resources previously prepared for the UE.
  • the flow chart is the same as the first example.
  • the UE receives the "RB handover command" sent by the macro eNB (including two cases of only RB handover and DRB and SRB handover), and the message includes the identifier of the target local eNB, and the DRB identifier to be transferred (or all DRBs) The indication of the transfer) and the corresponding radio resource configuration information.
  • the Macro eNB starts the timer while transmitting the message to the UE (or at the time of confirming that the UE receives the message). After receiving the message, the UE initiates access to the local eNB according to the indication in the message.
  • the RB handover command may be a newly defined RRC message, or may reuse the current RRC message, such as an RRC connection reconfiguration message.
  • the Macro eNB finds that the UE still does not successfully access the local eNB when the timer expires, that is, the UE still does not send the "RB Handover Complete" message to the macro eNB, then the Macro eNB considers that the RB handover failed, and then sends the message to the UE.
  • the RB handover fails "message" to inform the UE to stop the relevant RB handover procedure.
  • the Macro eNB simultaneously restores the previous DRB configuration of the UE, and continues to provide all DRB transmissions for the UE under the local eNB.
  • the UE After receiving the message, the UE stops the related RB handover process (such as the access process to the local eNB), and restores the previous DRB related configuration, and the DRB that has not successfully switched remains on the macro eNB.
  • the Macro eNB then notifies the local eNB If the RB handover fails, the local eNB deletes the context of the UE and releases the radio resources previously prepared for the UE.
  • the specific process is shown in Figure 15:
  • Step 1501 The Macro eNB sends an RN handover command to the UE.
  • Step 1502 The UE initiates an access to the local eNB.
  • Step 1503 The Macro eNB determines that access to the local eNB fails.
  • Step 1504 The Macro eNB sends an RN handover failure message to the UE.
  • Step 1505 The UE restores the DRB configuration in the Macro eNB, and the Macro eNB restores the DRN configuration for the user equipment.
  • Step 1506 The Macro eNB notifies the local eNB to release the resources of the UE.
  • Step 1507 The local eNB releases the UE context and the radio resources allocated for the UE.
  • the UE receives the "RB handover command" sent by the macro eNB (including two cases of only RB handover and DRB and SRB handover), and the message includes the identifier of the target local eNB, and the DRB identifier to be transferred (or all DRBs) The indication of the transfer) and the corresponding radio resource configuration information.
  • the Macro eNB starts the timer while transmitting the message to the UE (or at the time of confirming that the UE receives the message). After receiving the message, the UE initiates access to the local eNB according to the indication in the message.
  • the Macro eNB finds that the UE still does not successfully access the local eNB when the timer expires, that is, the UE still does not send the "RB Handover Complete" message to the macro eNB, then the Macro eNB considers that the RB handover failed, and then sends the message to the UE.
  • the RB reconfigures the message to inform the UE to stop the RB handover procedure for the relevant Local eNB and selects the alternate Local eNB in the "RB Reconfiguration" message to re-initiate the access.
  • the Macro eNB needs to negotiate with the standby Local eNB and complete the context transfer of the UE.
  • the UE After receiving the message, the UE stops the current RB handover procedure (such as the access procedure to the local eNB) and re-initiates the access to the alternate Local eNB in the "RB Reconfiguration" message. After the eNB fails to access the local eNB, the local eNB fails to perform the current RB handover. The local eNB deletes the context of the UE and releases the radio resources previously prepared for the UE.
  • the current RB handover procedure such as the access procedure to the local eNB
  • Step 1601 The Macro eNB sends an RN handover command to the UE.
  • Step 1602 The UE initiates an access to the local eNB.
  • Step 1603 The Macro eNB determines that access to the local eNB fails.
  • Step 1604 The Macro eNB sends an RB reconfiguration message to the UE.
  • Step 1605 The UE initiates an access to the standby local eNB.
  • Step 1606 The Macro eNB notifies the local eNB to release the resources of the UE.
  • Step 1607 The local eNB releases the UE context and the radio resources allocated for the UE.
  • step 1606 to step 1607, and then step 1605 is performed; step 1605 may also be performed first, and step 1606 is performed 1607; steps 1606 to 1607 and step 1605 may also be performed simultaneously.
  • the RB handover command and the RB reconfiguration command in the above embodiment may be a newly defined RRC message, or may reuse a current RRC message, such as an RRC connection reconfiguration message.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer-usable storage interfaces including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明实施例涉及无线通信技术领域,特别涉及一种承载切换的方法、系统和设备,用以提供一种针对用户面和控制面分离的分层网络部署场景下UE在承载转移过程中发生失败的处理方案。本发明实施例提供的一种承载切换的方法,包括:用户设备确定在将承载切换到本地基站时发生承载切换失败;所述用户设备将承载保持在宏基站或切换到其他本地基站。由于在用户设备将承载切换到本地基站时发生承载切换失败后,将承载保持在宏基站或切换到其他本地基站,从而能够针对用户面和控制面分离的分层网络部署场景下UE在承载转移过程中发生失败进行处理,提高了系统性能。

Description

一种承载切换的方法、 系统和设备 本申请要求在 2012年 7月 19日提交中国专利局、 申请号为 201210251894.2、发明名称 为"一种承载切换的方法、 系统和设备"的中国专利申请的优先权, 其全部内容通过引用结 合在本申请中。 技术领域
本发明涉及无线通信技术领域, 特别涉及一种承载切换的方法、 系统和设备。 背景技术
如图 1所示, 演进的通用陆地无线接入网 ( Evolved Universal Terrestrial Radio Access Network, E-UTRAN ) 的网络架构示意图中, E-UTRAN 由演进基站( e B )组成。
移动性管理实体 ( Mobility Management Entity, MME ) 与 eNB之间釆用 S I -MME接 口相连; eNB完成接入网功能, 与用户设备(UE )通过空口通信。 对于每一个附着到网络 的 UE, 有一个 MME为其提供服务, 该 MME称为 UE的服务 MME。 S 1-MME接口为 UE 提供对控制面服务, 包括移动性管理和数据无线承载(Data Radio Bearer, DRB )管理功 能。
服务网关 ( Serving GW, S-GW ) 与 eNB之间釆用 S 1-U接口相连, 对于每一个附着 到网络的 UE, 有一个 S-GW为其提供服务, 该 S-GW称为 UE的服务 S-GW。 S l-U接口 为 UE 提供用 户 面服务, UE 的用 户 面数据通过通用 分组无线业务 (General Packet Radio Service, GPRS)隧道协议 S l-U GTP ( GPRS Tunneling Protocol, GTP ) DRB在 S-GW和 eNB之间传输。
UE与网络之间的用户面协议栈如图 2所示, 控制面协议栈如图 3所示, 用户面协议 包括分组数据聚合协议(Packet Data Convergence Protocol , PDCP ), 无线链路控制(Radio Link Control, RLC ), 媒体接入控制 ( Medium Access Control, MAC )和物理层(PHY ); 控制面协议包括无线资源控制 ( Radio Resource Control , RRC ) 和非接入层 ( Non- Access Stratum, NAS ), 其中, RRC层消息需要经过用户面协议层的处理, 再在空 口进行传输; NAS层消息在空口封装在 RRC消息中传输; 在 S 1 -MME接口, 在 S 1连接 上传输。
在现有的 LTE/LTE-A网络中, UE的 RRC/PDCP/RLC/MAC/PHY对等层都位于同一个 eNB内, UE的 NAS层对等层位于与上述 eNB建立了针对该 UE的 S 1连接的 MME内。
在现有协议中, PDCP和 RLC实体与数据无线承载(Data Radio Bearer, DRB ) /信令 无线承载( Signal Radio Bearer, SRB ) 1/SRB2对应, 每一条 DRB和 SRB 1 , SRB2都分别 对应一套 PDCP和 RLC实体; DRB/SRB 1/SRB2在 MAC层汇聚。 因此, UE会同时由多套 PDCP和 RLC实体, 但只有一个 MAC层和物理层实体。
在如图 4所示的现有分层网络中,宏小区( Macro cell )提供基础覆盖,本地小区( Local cell )提供热点覆盖, Local Cell与 Macro Cell之间存在数据 /信令接口 (有线 /无线接口), UE可以工作在 Macro eNB或 Local eNB下。
由于 Local eNB控制的小区覆盖范围小、 服务的 UE少, 所以, 连接到 Local eNB的
UE往往能获得更好的服务盾量, 如: 获得更高的业务速率, 更高盾量的链路。 因此, 当 连接到 Macro eNB的 UE接近 Local eNB的控制的小区时, 可以切换到 Local eNB以获得 Local eNB提供的服务; 当 UE远离 Local eNB控制的小区时, 需要切换到 Macro eNB控 制的小区, 以保持无线连接。 由于 Local eNB数量多、覆盖小, 导致 UE需要频繁在 Macro eNB小区和 Local eNB小区之间切换。
在 UE用户面和控制面没有分离的情况下, UE仅和 macro eNB存在连接, 如图 5所 示。 为了降低 UE在 Macro eNB小区和 Local eNB小区之间进行切换的频率, 引入了用户 面和控制面分离的网络部署方式。
目前, 用户面和控制面分离的分层网络部署场景下, 对于 UE在承载转移过程中发生 失败的情况, 还没有解决的方法。 发明内容
本发明实施例提供的一种承载切换的方法、 系统和设备, 用以提供一种针对用户面和 控制面分离的分层网络部署场景下 UE在承载转移过程中发生失败的处理方案。
本发明实施例提供的一种承载切换的方法, 包括:
用户设备确定在将承载切换到本地基站时发生承载切换失败;
所述用户设备将承载保持在宏基站或切换到其他本地基站。
本发明实施例提供的另一种承载切换的方法, 其包括:
宏基站确定用户设备在将承载切换到本地基站时发生承载切换失败;
所述宏基站将所述用户设备的承载保持在所述宏基站或将所述用户设备的承载切换 到其他本地基站。
本发明实施例提供的一种承载切换的用户设备, 包括:
第一确定模块, 用于确定在将承载切换到本地基站时发生承载切换失败;
第一处理模块, 用于将承载保持在宏基站或切换到其他本地基站。
本发明实施例提供的一种承载切换的宏基站, 包括:
第二确定模块, 用于确定用户设备在将承载切换到本地基站时发生承载切换失败; 第二处理模块, 用于将所述用户设备的承载保持在所述宏基站或将所述用户设备的承 载切换到其他本地基站。 本发明实施例提供的一种承载切换的系统, 包括:
宏基站, 用于确定用户设备在将承载切换到本地基站时发生承载切换失败, 将所述用 户设备的承载保持在所述宏基站或将所述用户设备的承载切换到其他本地基站;
用户设备, 用于确定在将承载切换到本地基站时发生承载切换失败, 将承载保持在宏 基站或切换到其他本地基站。
由于在用户设备将承载切换到本地基站时发生承载切换失败后 , 将承载保持在宏基站 或切换到其他本地基站, 从而能够针对用户面和控制面分离的分层网络部署场景下 UE在 承载转移过程中发生失败进行处理, 提高了系统性能。 附图说明
图 1为背景技术中 E-UTRAN的网络架构示意图中;
图 2为背景技术中 UE与网络之间的用户面协议栈示意图;
图 3为背景技术中 UE与网络之间的控制面协议栈示意图;
图 4为背景技术中分层网络部署场景示意图;
图 5为背景技术中 UE仅和 macro e B有空口连接的示意图;
图 6为本发明实施例第一种 UE与两个 eNB之间的空口连接示意图;
图 7为本发明实施例第二种 UE与两个 eNB之间的空口连接示意图;
图 8为本发明实施例承载切换的系统结构示意图;
图 9为本发明实施例用户设备的结构示意图;
图 10为本发明实施例网络侧设备的结构示意图;
图 11为本发明实施例用户设备进行承载切换的方法流程示意图;
图 12为本发明实施例网络侧设备进行承载切换的方法流程示意图;
图 13为本发明实施例第一种无线承载( Radio Bearer, RB )切换失败处理的方法流程 示意图;
图 14为本发明实施例第二种 RB切换失败处理的方法流程示意图;
图 15为本发明实施例第三种 RB切换失败处理的方法流程示意图;
图 16为本发明实施例第四种 RB切换失败处理的方法流程示意图。 具体实施方式
本发明实施例在用户设备将承载切换到本地基站时发生承载切换失败后 , 将承载保持 在宏基站或切换到其他本地基站, 从而能够针对用户面和控制面分离的分层网络部署场景 下 UE在承载转移过程中发生失败进行处理, 提高了系统性能。
其中, 本发明实施例的承载切换仅有数据无线承载(Data Radio Bearer, DRB )切换; 或承载切换有 DRB和信令无线承载( Signal Radio Bearer, SRB )切换。
在 UE收到承载分离命令之后, UE用户面和控制面将分离, 此时 UE同时连接到两个 e B。 其两种空口连接如图 6和图 7所示。
下面结合说明书附图对本发明实施例作进一步详细描述。
在下面的说明过程中, 先从网络侧和用户设备侧的配合实施进行说明, 最后分别从网 络侧与用户设备侧的实施进行说明, 但这并不意味着二者必须配合实施, 实际上, 当网络 侧与用户设备侧分开实施时, 也解决了分别在网络侧、 用户设备侧所存在的问题, 只是二 者结合使用时, 会获得更好的技术效果。
如图 8所示, 本发明实施例承载切换的系统包括: 宏基站 10和用户设备 20。
宏基站 10, 用于确定用户设备在将承载切换到本地基站时发生承载切换失败; 将用户 设备的承载保持在宏基站或将用户设备的承载切换到其他本地基站;
用户设备 20, 用于确定在将承载切换到本地基站时发生承载切换失败, 将承载保持在 宏基站或切换到其他本地基站。
其中, 宏基站 10和用户设备 20确定用户设备在将承载切换到本地基站时发生承载切 换失败的方式有很多, 下面列举几种。
方式一、 宏基站 10和用户设备 20各维护一个定时器。
具体的,宏基站 10在切换定时器超时后未收到来自用户设备的 RB切换响应消息, 确 定用户设备在将承载切换到本地基站时发生承载切换失败;
用户设备 20在切换定时器超时后未成功接入本地基站, 确定在将承载切换到本地基 站时发生承载切换失败。
针对方式一, 宏基站 10通知用户设备 20切换定时器的时长; 相应的, 用户设备 20 根据宏基站 10通知的时长设置切换定时器。 比如宏基站 10可以将切换定时器的时长通过 承载切换命令通知给用户设备 20。
方式二、 用户设备 20各维护一个定时器。
具体的, 用户设备 20在切换定时器超时后未成功接入本地基站, 确定在将承载切换 到本地基站时发生承载切换失败;
然后, 用户设备 20向宏基站 10上报承载切换失败; 相应的, 宏基站 10在收到来自 用户设备 20的 RB切换失败消息后, 确定用户设备 20在将承载切换到本地基站时发生承 载切换失败。
针对方式一, 宏基站 10通知用户设备 20切换定时器的时长; 相应的, 用户设备 20 根据宏基站 10通知的时长设置切换定时器。 比如宏基站 10可以将切换定时器的时长通过 承载切换命令通知给用户设备 20。
方式三、 宏基站 10维护一个定时器。 具体的,宏基站 10在切换定时器超时后未收到来自用户设备的 RB切换响应消息, 确 定用户设备 20在将承载切换到本地基站时发生承载切换失败;
然后, 宏基站 10通知用户设备 20承载切换失败; 相应的, 用户设备 20在收到来自 宏基站 10的承载切换失败的通知后, 确定在将承载切换到本地基站时发生承载切换失败。
较佳地, 如果需要将用户设备 20的承载保持在宏基站 10, 宏基站 10恢复用户设备
20承载切换前在宏基站 10的 DRB配置,以及用户设备 20恢复承载切换前在宏基站 10的 DRB配置。
用户设备 20恢复承载切换前在宏基站 10的 DRB配置之后 , 用户设备 20还可以恢复 与宏基站 10之间的 DRB传输;
相应的, 宏基站 10恢复用户设备 20承载切换前在宏基站 10的 DRB配置之后 , 宏基 站, 1恢复与用户设备 20之间的 DRB传输。
较佳地, 如果需要将用户设备 20的承载切换到其他本地基站, 宏基站 10通知用户设 备 20向备用的本地基站发起接入,以及用户设备 20在收到来自宏基站 10的 RB重配置消 息后, 向备用的本地基站发起接入。
较佳地, 宏基站 10确定用户设备在将承载切换到本地基站时发生承载切换失败之后, 还可以通知本地基站 20删除用户设备的上下文并释放为用户设备分配的无线资源。
其中, 本发明实施例宏基站和本地基站可以是演进基站, 家庭基站、 中继节点(RN ), 微基站( pico )、 远端射频 ( Remote Radio Head, RRH )等其他类型的网络侧节点。
如图 9所示, 本发明实施例的用户设备包括: 第一确定模块 900和第一处理模块 910。 第一确定模块 900, 用于确定在将承载切换到本地基站时发生承载切换失败; 第一处理模块 910 , 用于将承载保持在宏基站或切换到其他本地基站。
其中, 所述第一确定模块 900可以由处理器实现;
第一处理模块 910可以由处理器实现。
较佳地, 第一确定模块 900在切换定时器超时后未成功接入本地基站, 确定在将承载 切换到本地基站时发生承载切换失败; 或在收到来自宏基站的承载切换失败的通知后, 确 定在将承载切换到本地基站时发生承载切换失败。
较佳地, 第一确定模块 900根据宏基站通知的时长设置切换定时器。
较佳地, 第一确定模块 900在切换定时器超时后未成功接入本地基站, 确定在将承载 切换到本地基站时发生承载切换失败之后 , 向宏基站上报承载切换失败。
较佳地, 第一处理模块 910根据下列方式将承载保持在宏基站:
恢复承载切换前在宏基站的 DRB配置。
较佳地, 第一处理模块 910恢复承载切换前在宏基站的 DRB配置之后, 恢复与宏基 站之间的 DRB传输。 较佳地, 第一处理模块 910根据下列方式将承载切换到其他本地基站: 在收到来自宏基站的 RB重配置消息后, 向备用的本地基站发起接入。
如图 10所示, 本发明实施例的网络侧设备包括: 第二确定模块 1010和第二处理模块 1011。
第二确定模块 1010, 用于确定用户设备在将承载切换到本地基站时发生承载切换失 败;
第二处理模块 1011 ,用于将用户设备的承载保持在宏基站或将用户设备的承载切换到 其他本地基站。
其中, 所述第二确定模块 1010可以由处理器实现;
所述第二处理模块 1011可以由处理器实现。
较佳地,第二确定模块 1010在切换定时器超时后未收到来自用户设备的 RB切换响应 消息, 确定用户设备在将承载切换到本地基站时发生承载切换失败; 或在收到来自用户设 备的 RB切换失败消息后, 确定用户设备在将承载切换到本地基站时发生承载切换失败。
较佳地, 第二确定模块 1010通知用户设备切换定时器的时长。
较佳地, 第二处理模块 1011根据下列方式将用户设备的承载保持在宏基站: 恢复用户设备承载切换前在宏基站的 DRB配置。
较佳地, 第二处理模块 1011恢复用户设备承载切换前在宏基站的 DRB配置之后, 恢 复与用户设备之间的 DRB传输。
较佳地, 第二处理模块 1011根据下列方式将用户设备的承载切换到其他本地基站: 通知用户设备向备用的本地基站发起接入。
较佳地,第二处理模块 1011确定用户设备在将承载切换到本地基站时发生承载切换失 败之后 , 通知本地基站删除用户设备的上下文并释放为用户设备分配的无线资源。
基于同一发明构思, 本发明实施例中还提供了一种用户设备进行承载切换的方法和网 络侧设备进行承载切换的方法, 由于这些方法解决问题的原理与本发明实施例承载切换的 系统相似, 因此这些方法的实施可以参见系统的实施, 重复之处不再赘述。
如图 11所示, 本发明实施例用户设备进行承载切换的方法包括下列步骤: 步骤 1101、 用户设备确定在将承载切换到本地基站时发生承载切换失败;
步骤 1102、 用户设备将承载保持在宏基站或切换到其他本地基站。
较佳地, 步骤 1101中, 用户设备在切换定时器超时后未成功接入本地基站, 确定在将 承载切换到本地基站时发生承载切换失败; 或
用户设备在收到来自宏基站的承载切换失败的通知后, 确定在将承载切换到本地基站 时发生承载切换失败。
较佳地, 步骤 1101之前, 还包括: 用户设备根据宏基站通知的时长设置切换定时器。
较佳地, 用户设备在切换定时器超时后未成功接入本地基站, 确定在将承载切换到本 地基站时发生承载切换失败之后 , 向宏基站上报承载切换失败。
较佳地, 用户设备将承载保持在宏基站包括:
用户设备恢复承载切换前在宏基站的 DRB配置。
较佳地, 用户设备恢复承载切换前在宏基站的 DRB 配置之后, 还可以恢复与宏基站 之间的 DRB传输。
较佳地, 用户设备将承载切换到其他本地基站, 包括:
用户设备在收到来自宏基站的 RB重配置消息后, 向备用的本地基站发起接入。 如图 12所示, 本发明实施例网络侧设备进行承载切换的方法包括下列步骤: 步骤 1201、 宏基站确定用户设备在将承载切换到本地基站时发生承载切换失败; 步骤 1202、宏基站将用户设备的承载保持在宏基站或将用户设备的承载切换到其他本 地基站。
较佳地,步骤 1201宏基站在切换定时器超时后未收到来自用户设备的 RB切换响应消 息, 确定用户设备在将承载切换到本地基站时发生承载切换失败; 或
宏基站在收到来自用户设备的 RB切换失败消息后, 确定用户设备在将承载切换到本 地基站时发生承载切换失败。
较佳地, 步骤 1201之前, 宏基站通知用户设备切换定时器的时长。
较佳地, 宏基站将用户设备的承载保持在宏基站, 包括:
宏基站恢复用户设备承载切换前在宏基站的 DRB配置。
较佳地, 宏基站恢复用户设备承载切换前在宏基站的 DRB 配置之后, 还可以恢复与 用户设备之间的 DRB传输。
较佳地, 宏基站将用户设备的承载切换到其他本地基站, 包括:
宏基站通知用户设备向备用的本地基站发起接入。
较佳地, 宏基站确定用户设备在将承载切换到本地基站时发生承载切换失败之后, 还 可以通知本地基站删除用户设备的上下文并释放为用户设备分配的无线资源。
下面分别列举几个实例对本发明的方案进行说明。
实例一、
UE收到 macro e B发送的 "RB切换命令" , 该消息中包含目标 local eNB的标识, 需 要转移的 DRB标识(或者全部 DRB都转移的指示) 以及相应的无线资源配置信息(对应 于图 6中的场景), 同时该消息中携带一个定时器长度。 UE收到该消息之后启动定时器, 同时根据该消息中的指示向 local eNB发起接入。 该 RB切换命令可以是新定义的 RRC消 息 , 也可以重用当前的 RRC消息, 如 RRC连接重配消息。 如果在定时器超时的时候, UE仍然没有成功接入 local eNB, 那么 UE认为此次 RB 切换失败, 然后 UE向 macro eNB发送 "RB切换失败" 消息, 以通知 macro eNB, 该消息 中可以进一步携带切换失败的原因或者 DRB标识等。同时 UE恢复之前的 DRB相关配置, 将没有成功切换的 DRB仍然保持在 macro eNB上。 Macro eNB收到 "RB切换失败" 消息 之后,恢复 UE之前的 DRB配置,在本 eNB下继续为 UE提供所有 DRB传输。同时 macro eNB通知 local eNB本次 RB切换失败, local eNB删除该 UE的上下文, 释放之前为该 UE 准备的无线资源。
具体流程如图 13所示:
步骤 1301、 Macro eNB向 UE发送 RN切换命令;
步骤 1302、 UE向 local eNB发起接入;
步骤 1303、 UE确定接入 local eNB失败;
步骤 1304、 UE向 IMacro eNB发送 RN切换失败消息;
步骤 1305、 UE恢复在 Macro eNB的 DRB配置,以及 Macro eNB为用户设备恢复 DRN 配置;
步骤 1306、 Macro eNB通知 local eNB释放 UE的资源;
步骤 1307、 local eNB释放 UE上下文和为 UE分配的无线资源。
实例二、
UE收到 macro eNB发送的 "RB切换命令" , 该消息中包含目标 local eNB的标识, 需 要转移的 DRB标识(或者全部 DRB都转移的指示)以及相应的无线资源配置信息(对应 于图 6中的场景), 同时该消息中携带一个定时器长度。 Marco eNB发送 "RB切换命令" 时启动对应的定时器, UE收到该消息之后启动定时器, 同时根据该消息中的指示向 local eNB发起接入。该 RB切换命令可以是新定义的 RRC消息,也可以重用当前的 RRC消息, 如 RRC连接重配消息。
对于 UE, 如果在定时器超时的时候, UE仍然没有成功接入 local eNB, 那么 UE认为 此次 RB切换失败, 自行释放 Local eNB相关配置信息, 恢复之前 Marco eNB下的 DRB 配置。
对于 Marco eNB,如果在 Marco eNB的定时器超时的时候,还没有收到 UE反馈的 "RB 切换响应" 消息, 那么认为承载分离失败。 Marco eNB可以恢复 UE恢复之前的 DRB相关 配置, 在本 eNB下继续为 UE提供所有 DRB传输。 同时 macro eNB通知 local eNB本次 RB切换失败, local eNB删除该 UE的上下文, 释放之前为该 UE准备的无线资源。
具体流程如图 14所示:
步骤 1401、 Macro eNB向 UE发送 RN切换命令;
步骤 1402、 UE向 local eNB发起接入; 步骤 1403、 UE确定接入 local eNB失败, 以及 Macro eNB确定接入 local eNB失败; 步骤 1404、UE恢复在 Macro eNB的 DRB配置,以及 Macro eNB为用户设备恢复 DRN 配置;
步骤 1405、 Macro eNB通知 local eNB释放 UE的资源;
步骤 1406、 local eNB释放 UE上下文和为 UE分配的无线资源。
实例三、
UE的 SRB切换也通过 RB切换命令触发。 UE收到 macro eNB发送的 "RB切换命令", 该消息中包含目标 local eNB的标识, 需要转移的 DRB标识(或者全部 DRB都转移的指 示) 以及相应的无线资源配置信息, 同时该消息中携带一个定时器长度, 以及要求 UE在 local eNB建立 SRB的指示 (该 SRB仅用于传输 local eNB无线资源管理和承载管理的相 关信息, 对应于图 7中的场景)。 UE收到该消息之后启动定时器, 同时根据该消息中的指 示向 local eNB发起接入。 该 RB切换命令可以是新定义的 RRC消息, 也可以重用当前的 RRC消息, 如 RRC连接重配消息。
如果在定时器超时的时候, UE仍然没有成功接入 local eNB, 那么 UE认为此次 SRB 和 DRB均切换失败,然后 UE向 macro eNB发送 "RB切换失败"消息,以通知 macro eNB, 该消息中可以进一步携带切换失败的原因或者 SRB、 DRB标识等。 同时 UE恢复之前的 DRB相关配置, 将没有成功切换的 DRB仍然保持在 macro eNB上。 Macro eNB收到 "RB 切换失败" 消息之后, 恢复 UE之前的 DRB配置, 在本 eNB下继续为 UE提供所有 DRB 传输。 同时 macro eNB通知 local eNB本次 DRB及 SRB切换失败, local eNB删除该 UE 的上下文, 释放之前为该 UE准备的无线资源。 流程图同实例一。
实例四、
UE收到 macro eNB发送的 "RB切换命令" (包含仅有 RB切换和 DRB和 SRB均切 换的两种情况), 该消息中包含目标 local eNB的标识, 需要转移的 DRB标识(或者全部 DRB都转移的指示 ) 以及相应的无线资源配置信息。 Macro eNB在向 UE发送该消息的同 时(或者在确认 UE收到该消息的时刻)启动定时器。 UE收到该消息之后根据该消息中的 指示向 local eNB发起接入。 该 RB切换命令可以是新定义的 RRC消息, 也可以重用当前 的 RRC消息, 如 RRC连接重配消息。
如果 Macro eNB发现在定时器超时的时候, UE仍然没有成功接入 local eNB, 即 UE 仍然没有向 macro eNB发送 "RB切换完成" 消息, 那么 Macro eNB认为此次 RB切换失 败,然后向 UE发送 "RB切换失败"消息,以通知 UE停止相关的 RB切换过程。 Macro eNB 同时恢复 UE之前的 DRB配置, 在本 eNB下继续为 UE提供所有 DRB传输。 UE收到该 消息后, 停止相关的 RB切换过程(如向 local eNB的接入过程 ), 同时恢复之前的 DRB相 关配置,将没有成功切换的 DRB仍然保持在 macro eNB上。之后 Macro eNB通知 local eNB 本次 RB切换失败, local eNB删除该 UE的上下文, 释放之前为该 UE准备的无线资源。 具体流程如图 15所示:
步骤 1501、 Macro eNB向 UE发送 RN切换命令;
步骤 1502、 UE向 local eNB发起接入;
步骤 1503、 Macro eNB确定接入 local eNB失败;
步骤 1504、 Macro eNB向 UE发送 RN切换失败消息;
步骤 1505、 UE恢复在 Macro eNB的 DRB配置,以及 Macro eNB为用户设备恢复 DRN 配置;
步骤 1506、 Macro eNB通知 local eNB释放 UE的资源;
步骤 1507、 local eNB释放 UE上下文和为 UE分配的无线资源。
实例五、
UE收到 macro eNB发送的 "RB切换命令" (包含仅有 RB切换和 DRB和 SRB均切 换的两种情况), 该消息中包含目标 local eNB的标识, 需要转移的 DRB标识(或者全部 DRB都转移的指示 ) 以及相应的无线资源配置信息。 Macro eNB在向 UE发送该消息的同 时(或者在确认 UE收到该消息的时刻)启动定时器。 UE收到该消息之后根据该消息中的 指示向 local eNB发起接入。
如果 Macro eNB发现在定时器超时的时候, UE仍然没有成功接入 local eNB, 即 UE 仍然没有向 macro eNB发送 "RB切换完成" 消息, 那么 Macro eNB认为此次 RB切换失 败, 然后向 UE发送 "RB重配置" 消息, 以通知 UE停止针对相关 Local eNB的 RB切换 过程, 并且选择 "RB重配置" 消息中的备用 Local eNB重新发起接入。 Macro eNB在下发 "RB重配置" 之前, 需与备用 Local eNB协商好并完成该 UE的上下文传递工作。 UE收 到该消息后, 停止当前的 RB切换过程(如向该 local eNB的接入过程 ), 同时向 "RB重配 置"消息中的备用 Local eNB重新发起接入。之后 Macro eNB通知 UE未能接入的 local eNB 本次 RB切换失败,该 local eNB删除该 UE的上下文,释放之前为该 UE准备的无线资源。
具体流程如图 16所示:
步骤 1601、 Macro eNB向 UE发送 RN切换命令;
步骤 1602、 UE向 local eNB发起接入;
步骤 1603、 Macro eNB确定接入 local eNB失败;
步骤 1604、 Macro eNB向 UE发送 RB重配置消息;
步骤 1605、 UE向备用 local eNB发起接入;
步骤 1606、 Macro eNB通知 local eNB释放 UE的资源;
步骤 1607、 local eNB释放 UE上下文和为 UE分配的无线资源。
其中, 步骤 1606〜步骤 1607与步骤 1605之间没有必然的时序关系, 既可以先执行步 骤 1606〜步骤 1607 , 然后在执行步骤 1605 ; 也可以先执行步骤 1605 , 在执行步骤 1606 步骤 1607; 还可以同时执行步骤 1606〜步骤 1607与步骤 1605。
上面实施例中的 RB切换命令与 RB重配置命令可以是新定义的 RRC消息,也可以重 用当前的 RRC消息, 如 RRC连接重配消息。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 系统、 或计算机程序产 品。 因此, 本发明可釆用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实 施例的形式。 而且, 本发明可釆用在一个或多个其中包含有计算机可用程序代码的计算机 可用存储介盾 (包括但不限于磁盘存储器、 CD-ROM、 光学存储器等)上实施的计算机程 序产品的形式。
本发明是参照根据本发明实施例的方法、 设备(系统)、 和计算机程序产品的流程图 和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图和 /或方框图中的每一流 程和 /或方框、 以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机 程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器, 使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用 于实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方 式工作的计算机可读存储器中, 使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品, 该指令装置实现在流程图一个流程或多个流程和 /或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上, 使得在计算机 或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理, 从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个 方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例, 但本领域内的技术人员一旦得知了基本创造性概 念, 则可对这些实施例作出另外的变更和修改。 所以, 所附权利要求意欲解释为包括优选 实施例以及落入本发明范围的所有变更和修改。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种承载切换的方法, 其特征在于, 该方法包括:
用户设备确定在将承载切换到本地基站时发生承载切换失败;
所述用户设备将承载保持在宏基站或切换到其他本地基站。
2、 如权利要求 1 所述的方法, 其特征在于, 所述用户设备确定在将承载切换到本地 基站时发生承载切换失败, 包括:
所述用户设备在切换定时器超时后未成功接入所述本地基站, 确定在将承载切换到本 地基站时发生承载切换失败; 或
所述用户设备在收到来自所述宏基站的承载切换失败的通知后, 确定在将承载切换到 本地基站时发生承载切换失败。
3、 如权利要求 2 所述的方法, 其特征在于, 所述用户设备确定在将承载切换到本地 基站时发生承载切换失败之前, 还包括:
所述用户设备根据所述宏基站通知的时长设置所述切换定时器。
4、 如权利要求 2 所述的方法, 其特征在于, 所述用户设备在切换定时器超时后未成 功接入所述本地基站, 确定在将承载切换到本地基站时发生承载切换失败之后, 还包括: 所述用户设备向所述宏基站上 4艮承载切换失败。
5、 如权利要求 1所述的方法, 其特征在于, 所述用户设备将承载保持在宏基站包括: 所述用户设备恢复承载切换前在宏基站的数据无线承载 DRB配置。
6、 如权利要求 5 所述的方法, 其特征在于, 所述用户设备恢复承载切换前在宏基站 的 DRB配置之后, 还包括:
所述用户设备恢复与所述宏基站之间的 DRB传输。
7、 如权利要求 1 所述的方法, 其特征在于, 所述用户设备将承载切换到其他本地基 站, 包括:
所述用户设备在收到来自所述宏基站的无线承载 RB重配置消息后, 向备用的本地基 站发起接入。
8、 如权利要求 1~7任一所述的方法, 其特征在于, 所述承载切换仅有数据无线承载 DRB切换; 或所述承载切换包括 DRB切换和信令无线承载 SRB切换。
9、 一种承载切换的方法, 其特征在于, 该方法包括:
宏基站确定用户设备在将承载切换到本地基站时发生承载切换失败;
所述宏基站将所述用户设备的承载保持在所述宏基站或将所述用户设备的承载切换 到其他本地基站。
10、 如权利要求 9所述的方法, 其特征在于, 所述宏基站确定用户设备在将承载切换 到本地基站时发生承载切换失败, 包括:
所述宏基站在切换定时器超时后未收到来自所述用户设备的 RB切换响应消息, 确定 所述用户设备在将承载切换到本地基站时发生承载切换失败; 或
所述宏基站在收到来自所述用户设备的无线承载 RB切换失败消息后, 确定所述用户 设备在将承载切换到本地基站时发生承载切换失败。
11、 如权利要求 9所述的方法, 其特征在于, 所述宏基站确定用户设备在将承载切换 到本地基站时发生承载切换失败之前, 还包括:
所述宏基站通知所述用户设备切换定时器的时长。
12、 如权利要求 9所述的方法, 其特征在于, 所述宏基站将所述用户设备的承载保持 在所述宏基站, 包括:
所述宏基站恢复所述用户设备承载切换前在所述宏基站的数据无线承载 DRB配置。
13、 如权利要求 12 所述的方法, 其特征在于, 所述宏基站恢复所述用户设备承载切 换前在所述宏基站的 DRB配置之后, 还包括:
所述宏基站恢复与所述用户设备之间的 DRB传输。
14、 如权利要求 9所述的方法, 其特征在于, 所述宏基站将所述用户设备的承载切换 到其他本地基站, 包括:
所述宏基站通知所述用户设备向备用的本地基站发起接入。
15、 如权利要求 9所述的方法, 其特征在于, 所述宏基站确定用户设备在将承载切换 到本地基站时发生承载切换失败之后, 还包括:
所述宏基站通知所述本地基站删除所述用户设备的上下文并释放为所述用户设备分 配的无线资源。
16、 如权利要求 9~15任一所述的方法, 其特征在于, 所述承载切换仅有数据无线承 载 DRB切换; 或所述承载切换包括 DRB切换和信令无线承载 SRB切换。
17、 一种承载切换的用户设备, 其特征在于, 该用户设备包括:
第一确定模块, 用于确定在将承载切换到本地基站时发生承载切换失败;
第一处理模块, 用于将承载保持在宏基站或切换到其他本地基站。
18、 如权利要求 17所述的用户设备, 其特征在于, 所述第一确定模块具体用于: 在切换定时器超时后未成功接入所述本地基站, 确定在将承载切换到本地基站时发生 承载切换失败; 或在收到来自所述宏基站的承载切换失败的通知后, 确定在将承载切换到 本地基站时发生承载切换失败。
19、 如权利要求 18所述的用户设备, 其特征在于, 所述第一确定模块还用于: 根据所述宏基站通知的时长设置所述切换定时器。
20、 如权利要求 18所述的用户设备, 其特征在于, 所述第一确定模块还用于: 在切换定时器超时后未成功接入所述本地基站, 确定在将承载切换到本地基站时发生 承载切换失败之后 , 向所述宏基站上 4艮承载切换失败。
21、 如权利要求 17 所述的用户设备, 其特征在于, 所述第一处理模块根据下列方式 将承载保持在宏基站:
恢复承载切换前在宏基站的数据无线承载 DRB配置。
22、 如权利要求 21所述的用户设备, 其特征在于, 所述第一处理模块还用于: 恢复承载切换前在宏基站的 DRB配置之后 , 恢复与所述宏基站之间的 DRB传输。
23、 如权利要求 17 所述的用户设备, 其特征在于, 所述第一处理模块根据下列方式 将承载切换到其他本地基站:
在收到来自所述宏基站的无线承载 RB重配置消息后, 向备用的本地基站发起接入。
24、 一种承载切换的宏基站, 其特征在于, 该宏基站包括:
第二确定模块, 用于确定用户设备在将承载切换到本地基站时发生承载切换失败; 第二处理模块, 用于将所述用户设备的承载保持在所述宏基站或将所述用户设备的承 载切换到其他本地基站。
25、 如权利要求 24所述的宏基站, 其特征在于, 所述第二确定模块具体用于: 在切换定时器超时后未收到来自所述用户设备的无线承载 RB切换响应消息, 确定所 述用户设备在将承载切换到本地基站时发生承载切换失败; 或在收到来自所述用户设备的 RB切换失败消息后, 确定所述用户设备在将承载切换到本地基站时发生承载切换失败。
26、 如权利要求 24所述的宏基站, 其特征在于, 所述第二确定模块还用于: 通知所述用户设备切换定时器的时长。
27、 如权利要求 24 所述的宏基站, 其特征在于, 所述第二处理模块根据下列方式将 所述用户设备的承载保持在所述宏基站:
恢复所述用户设备承载切换前在所述宏基站的数据无线承载 DRB配置。
28、 如权利要求 27所述的宏基站, 其特征在于, 所述第二处理模块还用于: 恢复所述用户设备承载切换前在所述宏基站的 DRB 配置之后, 恢复与所述用户设备 之间的 DRB传输。
29、 如权利要求 24 所述的宏基站, 其特征在于, 所述所述第二处理模块根据下列方 式将所述用户设备的承载切换到其他本地基站:
通知所述用户设备向备用的本地基站发起接入。
30、 如权利要求 24所述的宏基站, 其特征在于, 所述第二处理模块还用于: 确定用户设备在将承载切换到本地基站时发生承载切换失败之后, 通知所述本地基站 删除所述用户设备的上下文并释放为所述用户设备分配的无线资源。
31、 一种承载切换的系统, 其特征在于, 该系统包括: 宏基站, 用于确定用户设备在将承载切换到本地基站时发生承载切换失败, 将所述用 户设备的承载保持在所述宏基站或将所述用户设备的承载切换到其他本地基站;
用户设备, 用于确定在将承载切换到本地基站时发生承载切换失败, 将承载保持在宏 基站或切换到其他本地基站。
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