WO2014000684A1 - 一种进行切换的方法、系统和设备 - Google Patents

一种进行切换的方法、系统和设备 Download PDF

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Publication number
WO2014000684A1
WO2014000684A1 PCT/CN2013/078304 CN2013078304W WO2014000684A1 WO 2014000684 A1 WO2014000684 A1 WO 2014000684A1 CN 2013078304 W CN2013078304 W CN 2013078304W WO 2014000684 A1 WO2014000684 A1 WO 2014000684A1
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WO
WIPO (PCT)
Prior art keywords
base station
user plane
handover
user equipment
bearer
Prior art date
Application number
PCT/CN2013/078304
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English (en)
French (fr)
Inventor
鲍炜
张大钧
梁靖
杨义
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 WO2014000684A1 publication Critical patent/WO2014000684A1/zh

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Classifications

    • 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 performing handover. 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 the S1-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 bearer management functions.
  • the Serving GW (S-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 The S 1-U interface provides a user plane service for the UE, and the user plane data of the UE is carried in the S-GW and the eNB through the S 1-U General Packet Radio Service (GPRS) Tunneling Protocol (GTP). Transfer between.
  • 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 of PDCP and RLC entities at the same time, but only one MAC layer and physical layer entity.
  • SRB belongs to the control plane bearer
  • DRB belongs to User plane bearer.
  • 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 UE connected to the Local eNB can often obtain a better service shield, such as: obtaining a higher service rate and a higher shield link. Therefore, when the UE connected to the Macro eNB is close to 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, Stay connected wirelessly. Due to the large number of local eNBs and small coverage, the UE needs to frequently switch between the cell controlled by the Macro eNB and the cell controlled by the Local eNB. Since the switching frequency and the number of times of the UE are greatly increased, the risk of communication interruption when the UE performs handover is increased.
  • the switching frequency and the number of times of the UE are greatly increased, thereby increasing the risk of communication interruption when the UE performs handover.
  • a method, a system, and a device for performing handover according to an embodiment of the present invention are used to solve the problem that the UE is in the network architecture of the E-UTRAN in the prior art, because the switching frequency and the number of UEs are greatly increased, and the UE is increased.
  • the user equipment receives a notification from the macro base station that a handover is required
  • the user equipment maintains the control plane at the macro base station and switches some or all of the bearers of the user plane to at least one base station.
  • the macro base station determines that the user equipment needs to perform handover
  • the macro base station sends a command for performing user plane handover to the user equipment, to notify the user equipment to keep the control plane at the macro base station, and switch part or all of the bearer of the user plane to the at least one base station.
  • the local base station receives a user plane handover request message for the user equipment from the macro base station;
  • the local base station accepts some or all of the bearers of the user plane.
  • a user equipment for performing handover according to an embodiment of the present invention where the user equipment includes:
  • a first receiving module configured to receive a command from the macro base station for performing user plane switching
  • the first processing module is configured to maintain the control plane at the macro base station, and switch part or all of the bearer of the user plane to the at least one base station.
  • a macro base station for performing handover according to an embodiment of the present invention includes:
  • a determining module configured to determine that the user equipment needs to be switched
  • a second processing module configured to send, to the user equipment, a command for performing user plane switching, to notify the user equipment to keep the control plane at the macro base station, and switch part or all of the bearer of the user plane to at least one On the base station.
  • the second receiving module is configured to receive a user plane switching request message for the user equipment from the macro base station, and a third processing module, configured to receive part or all of the user plane.
  • a macro base station configured to send, to the user equipment, a command for performing user plane switching, to notify the user equipment to keep the control plane at the macro base station, and switch part or all of the bearer of the user plane to the at least one base station;
  • a user equipment configured to receive a command from the macro base station for performing user plane switching, to maintain the control plane at the macro base station, and to switch part or all of the bearer of the user plane to the at least one base station.
  • the embodiment of the present invention reduces the number of times that the user equipment performs the control plane switching, so that the UE switching frequency and the number of times increase in the network architecture of the E-UTRAN, which reduces the risk of communication interruption when the UE performs handover.
  • 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 network architecture of separating a user plane and a control plane according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a complete separation of a user plane and a control plane according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a partial separation of a user plane and a control plane according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a user plane protocol stack between a UE and a network according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a control plane protocol stack between a UE and a network according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a system for performing handover according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of user equipment in a system for performing handover according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a macro base station in a system for performing handover according to an embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a local base station in a system for performing handover according to an embodiment of the present invention
  • FIG. 14 is a schematic flowchart of a method for a user equipment to perform handover according to an embodiment of the present invention
  • FIG. 15 is a schematic flowchart of a method for processing a handover of a user equipment by a macro base station according to an embodiment of the present invention
  • FIG. 16 is a schematic flowchart of a method for processing a handover of a user equipment by a local base station according to an embodiment of the present invention
  • FIG. 18 is a schematic flowchart of a method for handover from a local cell to a macro cell according to an embodiment of the present invention
  • FIG. 19 is a schematic flowchart of a method for handover from a local cell to a local cell according to an embodiment of the present invention. detailed description
  • the user equipment in the overlapping area of the macro cell and the local cell receives the notification that the macro base station needs to perform handover; the user equipment keeps the control plane in the macro base station, and switches some or all of the bearer of the user plane to at least On a base station.
  • the embodiment of the present invention reduces the number of times that the user equipment performs the control plane switching, so that the UE switching frequency and the number of times increase in the network architecture of the E-UTRAN reduces the risk of communication interruption when the UE performs handover.
  • the macro base station is an LTE macro base station; the local base station is an LTE micro base station (Pico e B) or a home base station (Home e B) or a relay (Relay) device.
  • LTE macro base station is an LTE macro base station
  • the local base station is an LTE micro base station (Pico e B) or a home base station (Home e B) or a relay (Relay) device.
  • a network deployment mode in which the user plane and the control plane are separated is introduced.
  • the control plane connection and the user plane of the UE are both connected to the Macro eNB; when the UE moves to the overlapping area of the Macro eNB cell and the Local eNB cell.
  • all or part of the UE user plane is transferred to the Local eNB to obtain a higher service transmission rate; the control plane connection remains in the Macro eNB to prevent the UE from dropping the control plane connection handover failure.
  • the UE is simultaneously connected to two or more e Bs. As shown in FIG. 6, the UE is simultaneously connected to the Macro and Local eNBs, and obtains control plane and user plane connections respectively.
  • the user plane and the control plane can also be separated from the control plane, and the partial bearer of the user plane of the UE is separated from the control plane.
  • the bearer time is sensitive to the interruption time, and the user plane bearer of the service with small bandwidth requirement is maintained in the Macro eNB; the bearer access time is not sensitive to the interruption time, and the user plane bearer of the service with large bandwidth requirement is maintained at Local e Bo
  • the protocol stack between the UE and the network is as shown in FIG. 8 and FIG. 9.
  • the user plane eNB (Local eNB) of the UE provides a user plane data transmission function for the UE, which has no RRC layer peering with the UE, and cannot perform RRC control on the UE;
  • the control plane eNB (Macro eNB) of the UE provides a control plane message for the UE.
  • the control plane eNB needs to have a user plane protocol stack that is peered with the UE; since the NAS message needs to be carried by the RRC message, the serving MME of the UE is connected to the control plane eNB of the UE. .
  • some RRC functions may exist between the UE and the user plane eNB.
  • the UE may read a broadcast message sent by the user plane eNB (a point-to-multipoint RRC message transmitted by the eNB to multiple UEs).
  • the present invention uses the user plane node switching method corresponding thereto.
  • the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.
  • the system for performing handover in the embodiment of the present invention includes the following steps: a macro base station 10 and a user equipment 20.
  • the macro base station 10 is configured to send a command for performing user plane switching to the user equipment 20, to notify the user equipment 20 to keep the control plane at the macro base station 10, and carry part or all of the user plane (ie, part or all of DRB) switching to at least one base station;
  • the user equipment 20 is configured to receive a command for performing user plane handover from the macro base station, maintain the control plane at the macro base station, and switch part or all of the bearer of the user plane to the at least one base station.
  • the user equipment in the embodiment of the present invention may overlap the coverage area of the macro cell and the local cell.
  • the macro base station 10 sends a user plane handover message to the user equipment 20, to notify the user equipment to keep the control plane in the macro base station, and to switch part or all of the bearer of the user plane to at least one base station;
  • the user equipment 20 after receiving the user plane switching message from the macro base station that needs to be handed over, the user equipment 20 maintains the control plane at the macro base station 10 and switches some or all of the bearers of the user plane to at least one base station.
  • the macro base station 10 may add information for indicating user plane switching in the user plane switching message, such as ⁇ It is indicated by the lbit information as a user plane switching message. You can also build a new user plane switch message.
  • the part or all of the bearer of the user plane is switched to at least one base station, where the base station includes but is not limited to part or all of the following base stations: a macro base station and a local base station.
  • the macro base station 10 further sends a user plane handover request message to the local base station that needs to receive the user plane.
  • the system in the embodiment of the present invention may further include: the local base station 30.
  • the local base station 30 is configured to receive a user plane handover request message for the user equipment from the macro base station, and accept part or all of the user plane.
  • Switching is to separate part or all of the bearer of the user plane from the control plane, that is, to switch part or all of the bearer of the user plane from the macro base station to at least one local base station.
  • the macro base station 10 sends a user plane handover request message including bearer information of an Evolved Radio Access Bearer (E-RAB) that the user equipment needs to perform handover to the local base station 30 that needs to receive the bearer of the user plane;
  • E-RAB Evolved Radio Access Bearer
  • the local base station 30 determines the bearer information of the E-RAB that is switched according to the needs of the user equipment.
  • the macro base station 10 generates a user plane handover message according to the received user plane handover request response message from the local base station.
  • the user plane handover request response message includes but is not limited to at least one of the following information:
  • TEID Tunnel Endpoint Identifier
  • the user equipment 20 After receiving the user plane switching message, the user equipment 20 establishes synchronization with the newly connected base station after the handover and the base station connected before the handover, and only receives the received user plane handover message.
  • the configuration information configure the bearer of the user plane.
  • the base station to which the user equipment 20 is connected is a part of the base station to which the user equipment 20 is connected before the handover.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and B.
  • the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the unconnected base station after the handover, according to the configuration information of the user equipment in the user plane switching message, and multiplexes the user plane bearer to be switched to the corresponding
  • the MAC layer entity and the PHY entity of the base station ie, the user equipment 20 may also reconfigure the MAC and PHY layer entities affected (the multiplexed bearer changes) according to the command for performing the user plane handover).
  • Manner 2 The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, B, C, and D.
  • the user equipment generates, according to the configuration information of the base station of the user equipment after the handover, the MAC layer entity and the PHY entity corresponding to the base station that is not connected before the handover, and multiplexes the user plane bearer that needs to be switched to the corresponding MAC layer entity and PHY entity of the base station.
  • Manner 3 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and D.
  • the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generates the base station that is not connected before the handover, according to the configuration information of the user equipment in the user plane switching message.
  • the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generates the base station that is not connected before the handover, according to the configuration information of the user equipment in the user plane switching message.
  • Corresponding MAC layer entity and PHY entity multiplexing the user plane bearer that needs to be handed over to the corresponding base station
  • the base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, 8, and ⁇ .
  • the user equipment 20 multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment in the user plane switching message.
  • the user equipment 20 multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the cell that carries the user plane
  • the macro base station is received.
  • Corresponding MAC layer entity and PHY entity are reconfigured, and the bearer reserved on the user plane of the macro base station is multiplexed to the reconfigured MAC layer entity and the PHY entity; if the configuration information corresponding to the local base station is received, the local The MAC layer entity and the PHY entity corresponding to the base station are reconfigured, and the bearer reserved on the user plane of the local base station is multiplexed onto the reconfigured MAC layer entity and the PHY entity.
  • the user equipment 20 returns the user plane handover complete message to the macro base station 10 after the user equipment switches some or all of the bearers of the user plane to the at least one base station.
  • the macro base station 10 after receiving the user plane handover complete message from the user equipment, the macro base station 10 sends a path switch request to the MME, and after receiving the path switch request response from the MME, forwards the path to the local base station 30 carrying the user plane. Conversion request response.
  • the path switching request includes a transport layer address of the bearer of the bearer receiving the user plane and a TEID of the GTP tunnel carried by the downlink Sl-U2 corresponding to the E-RAB accepted by the cell carrying the user plane.
  • the local base station 30 After receiving the path conversion request response from the macro base station, the local base station 30 notifies the macro base station 10 to release the bearer resources of the switched user plane;
  • the macro base station 10 After receiving the release notification from the local base station 30, the macro base station 10 releases the resources of the user plane corresponding to the switched bearer.
  • Scenario 2 Switching is to aggregate part or all of the bearer of the user plane with the control plane, that is, to switch part or all of the bearer of the user plane from the at least one local base station to the macro base station.
  • the macro base station 10 after successfully receiving the user plane of the user equipment, notifies the specific base station to suspend the data transmission carried by the switched user plane, where the specific base station is the base station with reduced user plane bearer of the user equipment after handover (including after handover) a base station connected to the user equipment, a base station connected to the user equipment after the handover, but a base station having a reduced number of bearers on the user plane of the user equipment before the handover, etc.);
  • the local base station 30 performs a data forwarding process after receiving the notification from the macro base station to suspend the transmission of the user plane data.
  • a data forwarding process For details of the data forwarding process, refer to the 3GPP TS 36.300 protocol, and details are not described herein.
  • the user plane switching message includes but is not limited to at least one of the following information:
  • the user equipment 20 configures the bearer of the user plane according to the configuration information in the received user plane switching message. According to different situations, it can be divided into two ways to configure the bearer of the user plane.
  • the base station to which the user equipment 20 is connected is a part of the base station to which the user equipment 20 is connected before the handover.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and B.
  • the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the unconnected base station after the handover, according to the configuration information of the user equipment in the user plane switching message, and multiplexes the user plane bearer to be switched to the corresponding MAC layer entity and PHY entity of the base station.
  • Manner 2 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, 8 and . . That is, part of the bearer of the user plane in the local base station is switched to the macro base station.
  • the user equipment 20 multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment in the user plane switching message.
  • the user equipment 20 multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the cell that carries the user plane, if the configuration information corresponding to the macro base station is received, the macro base station is received.
  • the corresponding MAC layer entity and PHY entity are reconfigured, and the DRBs reserved at the target base station are multiplexed onto the reconfigured MAC layer entity and PHY entity.
  • the user equipment 20 returns the user plane handover complete message to the macro base station 10 after the user equipment switches some or all of the bearers of the user plane to the at least one base station.
  • the macro base station 10 after receiving the user plane handover complete message from the user equipment, the macro base station 10 sends a path switch request to the MME, and after receiving the path switch request response from the MME, does not retain any user plane of the user equipment after the handover.
  • the bearer's local base station 30 sends a user equipment context release request, and sends a resource release request to the local base station 30 that is reserved by the user plane of the user equipment after the handover;
  • the local base station 30 After receiving the user equipment context release request from the macro base station, the local base station 30 releases the bearer resources of all user planes of the user equipment;
  • Scenario 3 Perform part or all of the bearer of the user plane for transfer between local base stations, that is, switch part or all bearers of the user plane from at least one local base station to at least one local base station.
  • the macro base station 10 sends a user plane handover request message including the bearer information of the E-RAB that the user equipment needs to perform handover to the local base station 30 that needs to receive the bearer of the user plane, and after the local base station successfully accepts the user plane of the user equipment.
  • the specific base station is a base station with reduced user plane bearer of the user equipment after handover (including a base station that is not connected to the user equipment after handover, and a base station that is connected to the user equipment after handover but switches
  • the number of bearers of the user plane of the user equipment is reduced, and the base station is reduced, and the same is not repeated.
  • the local base station 30 determines the bearer information of the E-RAB that is switched according to the needs of the user equipment. E-RAB, and returning a user plane handover request response message containing the E-RAB bearer information allowed to be received to the macro base station 10; the macro base station 10 generates a user plane handover message according to the received user plane handover request response message from the local base station. ; as well as
  • the local base station 30 belonging to a specific base station performs a data forwarding process upon receiving a notification from the macro base station to suspend the transmission of the user plane data.
  • a data forwarding process For details of the data forwarding process, refer to the 3GPP TS 36.300 protocol, and details are not described herein.
  • the user plane handover request response message includes but is not limited to at least one of the following information:
  • the user plane switching message includes but is not limited to at least one of the following information:
  • Bearer information for user plane switching such as the ID of the bearer
  • Information carried by the user plane that needs to be released such as the ID of the bearer
  • the user equipment 20 After receiving the user plane switching message, the user equipment 20 establishes synchronization with the newly connected base station after the handover and the base station connected before the handover, and only receives the received user plane handover message.
  • the configuration information configure the bearer of the user plane.
  • the base station to which the user equipment 20 is connected is a part of the base station to which the user equipment 20 is connected before the handover.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base station to which the user equipment 20 is connected after the handover is A and
  • the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the unconnected base station after the handover, according to the configuration information of the user equipment in the user plane switching message, and multiplexes the user plane bearer to be switched to the corresponding MAC layer entity and PHY entity of the base station.
  • Manner 2 The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, B, C, and D.
  • the user equipment generates, according to the configuration information of the base station of the user equipment after the handover, the MAC layer entity and the PHY entity corresponding to the base station that is not connected before the handover, and multiplexes the user plane bearer that needs to be switched to the corresponding MAC layer entity and PHY entity of the base station.
  • Manner 3 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and D.
  • the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generates the base station that is not connected before the handover, according to the configuration information of the user equipment in the user plane switching message.
  • the corresponding MAC layer entity and the PHY entity multiplex the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.
  • Mode 4 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, 8 and . . That is, part of the bearer of the user plane in at least one base station is switched to other connected local base stations.
  • the user equipment 20 multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment in the user plane switching message.
  • the user equipment 20 multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the cell that carries the user plane, if the configuration information corresponding to the local base station is received, the local base station is received.
  • the corresponding MAC layer entity and the PHY entity are reconfigured, and the bearers reserved on the user plane of the macro base station are multiplexed onto the reconfigured MAC layer entity and the PHY entity.
  • the user equipment 20 returns the user plane handover complete message to the macro base station 10 after the user equipment switches some or all of the bearers of the user plane to the at least one base station.
  • the macro base station 10 after receiving the user plane handover complete message from the user equipment, the macro base station 10 sends a path switch request to the MME, and after receiving the path switch request response from the MME, forwards the path to the local base station 30 carrying the user plane.
  • the conversion request response (here the forwarding path conversion request response has two purposes: to inform the base station that the downlink GTP tunnel with the S-GW is successfully established; to notify the base station S-GW of the transport layer address, and to identify the assigned uplink tunnel port TEID for the bearer)
  • the e B may send the uplink data to the S-GW according to the transport layer address and the TEID of the S-GW, and send the user equipment context release request to the local base station 30 that is not reserved for all user planes of the user equipment after the handover, to The local base station 30 carried by the part of the user plane that retains the user equipment after the handover transmits a resource release request; preferably.
  • the path switching request includes a transport layer address of the bearer of the bearer that receives the user plane and a TEID of the GTP tunnel that is carried by the downlink Sl-U ⁇ corresponding to the E-RAB that is accepted by the bearer of the bearer of the user plane.
  • the local base station 30 After receiving the user equipment context release request from the macro base station, the local base station 30 releases the bearer resources of all user planes of the user equipment;
  • the local base station 30 After receiving the resource release request from the macro base station, the local base station 30 releases the bearer resources of the switched user plane.
  • the user equipment in the system for performing handover in the embodiment of the present invention includes: a first receiving module 1100 and a first processing module 1110.
  • the first receiving module 1100 is configured to receive a command from the macro base station for performing user plane switching.
  • the first processing module 1110 is configured to keep the control plane in the macro base station, and switch part or all of the user plane to switch To at least one base station.
  • the first receiving module 1100 may be a receiving module such as an antenna, and the first processing module 1110 may be a CPU (general purpose processor), a DSP (digital signal processor), or an FPGA (programmable logic gate array).
  • the first processing module 1110 may be a CPU (general purpose processor), a DSP (digital signal processor), or an FPGA (programmable logic gate array).
  • the command received by the first receiving module 1100 for performing user plane switching is a user plane switching message. If the handover is performed, part or all of the bearer of the user plane is separated from the control plane or part or all of the bearer of the user plane is transferred between the local base stations; the first processing module 1110 keeps synchronization with the base station connected before and after the handover. At the same time, the base station is newly synchronized with the newly connected base station, and the configuration information in the received user plane switching message is configured, and the bearer of the user plane is configured.
  • part or all of the user plane is aggregated with the control plane
  • the first processing module 1110 configures the bearer of the user plane according to the configuration information in the received user plane switching message.
  • the first processing module 1110 is specifically configured to:
  • the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover are deleted according to the configuration information of the base station of the user equipment after the handover in the user plane handover message.
  • the MAC layer entity and the PHY corresponding to the base station not connected before the handover are generated according to the configuration information of the base station of the user equipment after the handover in the user plane handover message.
  • the user equipment in the user plane switching message receives the configuration information of the cell carried by the user plane, and deletes the corresponding base station that is not connected after the handover.
  • the device receives the configuration information of the cell carried by the user plane, and multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.
  • the first processing module 1110 multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the cell that carries the user plane, after receiving the configuration information corresponding to the macro base station, Reconfiguring the MAC layer entity and the PHY entity corresponding to the macro base station, and multiplexing the bearer reserved on the user plane of the macro base station to the reconfigured MAC layer entity and the PHY entity.
  • the first processing module 1110 returns a user plane handover complete message to the macro base station after switching some or all of the bearers of the user plane to the at least one base station.
  • the macro base station in the system for performing handover in the embodiment of the present invention includes: a determining module 1210 and a second processing module 1220.
  • the second processing module 1220 is configured to send a command for performing user plane switching to the user equipment, and notify the user equipment to keep the control plane at the macro base station, and switch part or all of the bearer of the user plane to the at least one base station.
  • the determining module 1210 may be a CPU (general purpose processor), a DSP (digital signal processor), or an FPGA (programmable logic gate array); the second processing module 1220 may be a CPU (general purpose processor), a DSP ( A digital signal processor) or an FPGA (Programmable Logic Gate Array), and a device consisting of a combination of RF channels and antennas.
  • the command for performing user plane switching is a user plane switching message.
  • the information for indicating the user plane switching is added in the user plane switching message.
  • the base station sends the user equipment to the base station that needs to receive the user plane.
  • a user plane handover request message for carrying information of the switched E-RAB; generating a user plane handover message according to the received user plane handover request response message from the base station.
  • the second processing module 1220 sends a command for performing user plane handover to the user equipment
  • the second processing module 1220 sends a path conversion request to the MME; and receives the path from the MME.
  • the path conversion request response is forwarded to the base station; after receiving the release notification from the base station, the resources of the switched user plane are released.
  • the handover is performed, part or all of the bearer of the user plane is aggregated with the control plane; before the second processing module 1220 sends the user plane handover message to the user equipment, after the user plane of the user equipment is successfully received, the specific base station is notified to be suspended. Data transfer of the switched user plane;
  • the specific base station is a base station with reduced user plane bearer of the user equipment after handover.
  • the second processing module 1220 sends a command for performing user plane handover to the user equipment
  • the second processing module 1220 sends a path conversion request to the MME; and receives the path from the MME.
  • the user equipment context release request is sent to the specific base station that is not reserved by the user plane of the user equipment after the handover
  • the resource release request is sent to the specific base station that is reserved by the user plane of the user equipment after the handover.
  • the second processing module 1220 sends the user equipment to the base station that needs to receive the user plane.
  • the user plane switching request message of the bearer information of the E-RAB that needs to be switched generates a user plane handover message according to the received user plane handover request response message from the base station; and notifies the specific after the local base station successfully accepts the user plane of the user equipment
  • the base station suspends the data transmission of the switched user plane, where the specific base station is the base station with reduced user plane bearer of the user equipment after handover.
  • the second processing module 1220 sends a command for performing user plane switching to the user equipment, Sending a path conversion request to the MME after receiving the user plane handover complete message from the user equipment; after receiving the path switch request response from the MME, forwarding the path switch request response to the base station carrying the user plane, and not retaining the user equipment after the handover
  • the specific base station carried by all user planes sends a user equipment context release request, and sends a resource release request to a specific base station that is reserved for part of the user plane of the user equipment after the handover.
  • the path switching request includes a transport layer address of the bearer of the bearer receiving the user plane and a TEID of the GTP tunnel of the downlink Sl-U ⁇ corresponding to the E-RAB accepted by the host receiving the user plane.
  • the local base station in the system for performing handover in the embodiment of the present invention includes: a second receiving module 1310 and a third processing module 1320.
  • the second receiving module 1310 is configured to receive a user plane switching request message for the user equipment from the macro base station, and the third processing module 1320 is configured to receive part or all of the user plane.
  • the second receiving module 1310 can be implemented by a device composed of a radio frequency channel and an antenna.
  • the third processing module 1320 can be a CPU (general purpose processor), a DSP (digital signal processor), or an FPGA (programmable logic gate array). ).
  • the user plane switching request message includes the bearer information of the E-RAB that the user equipment needs to perform handover; the third processing module 1320 determines the received E-RAB according to the bearer information of the E-RAB that the user equipment needs to perform handover, and A user plane handover request response message containing E-RAB bearer information allowed to be admitted is returned to the macro base station.
  • the third processing module 1320 after receiving the part or all of the bearer of the user plane, notifies the macro base station to release the bearer resource of the switched user plane after receiving the path conversion request response from the macro base station.
  • the third processing module 1320 performs a data forwarding process after receiving the notification from the macro base station to suspend the user plane data transmission.
  • the third processing module 1320 releases the bearer resources of all user planes of the user equipment after receiving the user equipment context release request from the macro base station.
  • the embodiment of the present invention further provides a method for a user equipment to perform handover, a method for a macro base station to perform handover for a user equipment, and a method for a local base station to perform handover for a user equipment, and the principle of solving the problem by these methods
  • the system of the present invention is similar to that of the embodiment of the present invention. Therefore, the implementation of these methods can be referred to the implementation of the system, and the details are not described again.
  • the method for performing handover by a user equipment includes the following steps:
  • Step 1401 The user equipment receives a command from the macro base station for performing user plane switching.
  • Step 1402 The user equipment maintains the control plane at the macro base station, and switches some or all of the bearers of the user plane to at least one base station.
  • step 1402 after receiving the user plane handover message from the macro base station that needs to be handed over, the user equipment maintains the control plane at the macro base station, and switches part or all of the bearer of the user plane to at least one base station.
  • Switching is to separate part or all of the bearer of the user plane from the control plane, that is, to switch part or all of the bearer of the user plane from the macro base station to at least one local base station.
  • step 1402 the base station connected to both the pre-switching and the post-switching is synchronized with the newly connected base station after the handover, and the bearer of the user plane is configured according to the configuration information in the received user plane switching message.
  • Manner 1 The base station to which the user equipment is connected after the handover is a part of the base station to which the user equipment 20 is connected before the handover.
  • the user equipment deletes the MAC layer entity and the PHY entity corresponding to the unconnected base station after the handover, according to the configuration information of the user equipment in the user plane switching message, and multiplexes the user plane bearer that needs to be switched to the corresponding The MAC layer entity and PHY entity of the base station.
  • Manner 2 The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover.
  • the user equipment generates, according to the configuration information of the base station of the user equipment after the handover, the MAC layer entity and the PHY entity corresponding to the base station that is not connected before the handover, and multiplexes the user plane bearer that needs to be switched to the corresponding MAC layer entity and PHY entity of the base station.
  • Manner 3 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generates a corresponding MAC address entity that is not connected before the handover, according to the configuration information of the user equipment in the user plane switching message.
  • the MAC layer entity and the PHY entity multiplex the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.
  • Mode 4 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment in the user plane switching message.
  • the macro base station corresponds to the macro base station.
  • the MAC layer entity and the PHY entity are reconfigured, and the bearers reserved on the user plane of the macro base station are multiplexed onto the reconfigured MAC layer entity and the PHY entity.
  • the user plane handover complete message is returned to the macro base station.
  • Scenario 2 Switching is to aggregate part or all of the bearer of the user plane with the control plane, that is, to switch part or all of the bearer of the user plane from the at least one local base station to the macro base station.
  • the user equipment configures the bearer of the user plane according to the configuration information in the received user plane switching message.
  • Manner 1 The base station to which the user equipment is connected after the handover is a part of the base station to which the user equipment 20 is connected before the handover. Specifically, the user equipment deletes the MAC layer entity and the PHY entity corresponding to the unconnected base station after the handover, according to the configuration information of the user equipment in the user plane switching message, and multiplexes the user plane bearer that needs to be switched to the corresponding The MAC layer entity and PHY entity of the base station.
  • Manner 2 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment in the user plane switching message.
  • the macro base station corresponds to the macro base station.
  • the MAC layer entity and the PHY entity are reconfigured, and the bearers reserved on the user plane of the macro base station are multiplexed onto the reconfigured MAC layer entity and the PHY entity.
  • the user plane handover complete message is returned to the macro base station.
  • Scenario 3 Perform part or all of the bearer of the user plane for transfer between local base stations, that is, switch part or all bearers of the user plane from at least one local base station to at least one local base station.
  • the base station connected to both the pre-switching and the post-switching is synchronized with the newly connected base station after the handover, and the user information is obtained according to the configuration information in the received user plane switching message.
  • the bearer is configured.
  • Manner 1 The base station to which the user equipment is connected after the handover is a part of the base station to which the user equipment 20 is connected before the handover.
  • the user equipment deletes the MAC layer entity and the PHY entity corresponding to the unconnected base station after the handover, according to the configuration information of the user equipment in the user plane switching message, and multiplexes the user plane bearer that needs to be switched to the corresponding The MAC layer entity and PHY entity of the base station.
  • Manner 2 The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover.
  • the user equipment generates, according to the configuration information of the base station of the user equipment after the handover, the MAC layer entity and the PHY entity corresponding to the base station that is not connected before the handover, and multiplexes the user plane bearer that needs to be switched to the corresponding MAC layer entity and PHY entity of the base station.
  • Manner 3 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generates a corresponding MAC address entity that is not connected before the handover, according to the configuration information of the user equipment in the user plane switching message.
  • the MAC layer entity and the PHY entity multiplex the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.
  • Mode 4 The base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment before the handover is connected.
  • the user equipment is configured to receive the configuration information of the cell carried by the user plane.
  • the user plane bearer that needs to be handed over is multiplexed to the MAC layer entity and the PHY entity of the corresponding base station.
  • the user equipment multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the cell that carries the user plane, if the configuration information corresponding to the macro base station is received, the macro base station corresponds to the macro base station.
  • the MAC layer entity and the PHY entity are reconfigured, and the bearers reserved on the user plane of the macro base station are multiplexed onto the reconfigured MAC layer entity and the PHY entity.
  • the user plane handover complete message is returned to the macro base station.
  • the method for processing a user equipment handover by a macro base station includes the following steps: Step 1501: The macro base station determines that the user equipment needs to perform handover;
  • Step 1502 The macro base station sends a command for performing user plane switching to the user equipment, to notify the user equipment to keep the control plane in the macro base station, and switch part or all of the bearer of the user plane to the at least one base station.
  • the macro base station sends a user plane handover message to the user equipment, to notify the user equipment to keep the control plane at the macro base station, and to switch part or all of the bearer of the user plane to at least one base station.
  • the macro base station may add information for indicating user plane switching in the user plane switching message, for example, The lbit information is used to indicate user plane switching. You can also build a new user plane switch message.
  • Switching is to separate part or all of the bearer of the user plane from the control plane, that is, to switch part or all of the bearer of the user plane from the macro base station to at least one local base station.
  • the macro base station sends, to the local base station that needs to receive the bearer of the user plane, a user plane handover request message that includes bearer information that the user equipment needs to perform handover;
  • the macro base station generates a user plane switching message according to the received user plane handover request response message from the local base station.
  • the macro base station After receiving the user plane handover complete message from the user equipment, the macro base station sends a path switch request to the MME, and after receiving the path switch request response from the MME, forwards the path switch to the local base station carried by the user plane.
  • Request a response.
  • the path switching request includes a transport layer address of the bearer of the bearer that receives the user plane and a TEID of the GTP tunnel that is carried by the downlink S1-U corresponding to the E-RAB that is received by the bearer of the bearer of the user plane.
  • the macro base station releases the resources of the switched user plane.
  • Scenario 2 Switching is to aggregate part or all of the bearer of the user plane with the control plane, that is, to switch part or all of the bearer of the user plane from the at least one local base station to the macro base station.
  • the macro base station after successfully receiving the user plane of the user equipment, notifies the specific base station to suspend the data transmission of the switched user plane, where the specific base station is the base station with reduced user plane bearer of the user equipment after the handover.
  • the macro base station sends a path switch to the MME after receiving the user plane handover complete message from the user equipment.
  • the local base station 30 sends a resource release request.
  • Scenario 3 Perform part or all of the bearer of the user plane for transfer between local base stations, that is, switch part or all bearers of the user plane from at least one local base station to at least one local base station.
  • the macro base station sends a user plane handover request message including the bearer information of the E-RAB that the user equipment needs to perform handover to the local base station 30 that needs to receive the user plane, and notify the user base after the local base station successfully accepts the user equipment.
  • the specific base station suspends the data transmission of the switched user plane, where the specific base station is the base station with reduced user plane bearer of the user equipment after the handover (including the base station that is not connected to the user equipment after the handover, and the base station that is connected to the user equipment after the handover but after the handover) a base station having a reduced number of bearers on the user plane of the user equipment before switching, etc.);
  • the macro base station generates a user plane handover message according to the received user plane handover request response message from the local base station; and after receiving the user plane handover complete message from the user equipment, sends a path switch request to the MME, and receives the After the path conversion request response from the MME, the path conversion request response is forwarded to the local base station that is carried by the user plane, and the user equipment context release request is sent to the local base station 30 that does not retain all user planes of the user equipment after the handover, and the handover is performed.
  • the local base station 30 carried by the part of the user plane that retains the user equipment then sends a resource release request; preferably.
  • the path switching request includes a transport layer address of the bearer of the bearer receiving the user plane and a TEID of the GTP tunnel carried by the downlink Sl-U ⁇ corresponding to the E-RAB accepted by the cell carrying the user plane.
  • step 14 and FIG. 15 can synthesize a process to form a method for switching, that is, step 1501 and step 1502 are performed first, and then step 1401 and step 1402 are performed.
  • the method for processing a local device handover by a local base station includes the following steps:
  • Step 1601 The local base station receives a user plane handover request message for the user equipment from the macro base station.
  • Step 1602 The local base station accepts part or all of the bearer of the user plane.
  • the user plane handover request message includes the bearer information of the E-RAB that the user equipment needs to perform handover.
  • the local base station determines the received E-RAB according to the bearer information of the E-RAB that the user equipment needs to perform handover. And returning a user plane handover request response message containing the E-RAB bearer information allowed to be received to the macro base station.
  • the local base station After the local base station receives part or all of the bearer of the user plane, after receiving the path switch request response from the macro base station, the local base station is notified to release the bearer resource of the switched user plane.
  • the data forwarding process is performed.
  • the bearer resource of the switched user plane is released.
  • step 1501 is performed first.
  • step 1401 and step 1402 are performed, and finally step 1601 and step 1602 are performed.
  • step 1601 and step 1602 are performed.
  • Example 1 When the user moves from the coverage of macro e B to the coverage of local e B, the network needs to replace the user plane transmission node with Local e B.
  • the method for switching all control plane bearers from a macro cell to a local cell includes the following steps:
  • the Macro eNB performs measurement configuration on the UE, and the UE performs measurement according to the received measurement configuration information. 2. On the uplink resource allocated by the Macro eNB for the UE, the UE performs measurement on the UE. The measurement result will be used to assist the Macro eNB in making handover decisions;
  • the Macro eNB performs measurement decisions. If the Macro eNB decides to switch, continue with the subsequent steps;
  • the Macro eNB sends a user plane handover request to the Local eNB, and the message carries:
  • All the E-RAB bearer information of the UE including the bearer ID, the Quality of Service (QoS) parameter, the TEID of the corresponding uplink GTP tunnel, and the transport layer address of the uplink GTP tunnel (S-GW);
  • QoS Quality of Service
  • S-GW transport layer address of the uplink GTP tunnel
  • the underlying configuration information of the UE in the Macro eNB including: PDCP, RLC layer configuration, and the like;
  • the Macro eNB triggers the migration of the UE user plane bearer through the user plane handover request message, and realizes the separation of the user plane and the control plane bearer.
  • the Local eNB refers to the message and performs an admission decision according to the QoS information of the bearer to be admitted. If the Local eNB allows to accept at least one to-be-switched bearer of the UE, perform an underlying configuration to prepare for handover;
  • the local eNB decides to accept at least one to-be-switched bearer of the handover UE, generating a user plane handover request response, where the message carries:
  • the E-RAB bearer information that is allowed to be received the ID of the bearer, the TEID and the transport layer address of the GTP tunnel that carries the corresponding uplink forwarding to the E-RAB bearer; the TEID and transport layer address of the corresponding downlink forwarding bearer GTP tunnel; The TEID and transport layer address of the GTP tunnel carried by the downlink S1-U; the E-RAB bearer information rejected by the receiver: including the bearer ID;
  • the underlying configuration information of the cell that the UE receives in the user plane includes: a MAC, a PHY layer configuration; and a configuration information of a cell that is carried by the user plane: a physical random access channel (PRACH) channel configuration;
  • PRACH physical random access channel
  • C-RNTI Cell Radio Network Temporary Identifier
  • the Macro eNB 4 generates the user plane handover signaling and sends it to the UE according to the information received in step 6;
  • the message carries:
  • Accepting configuration information of a cell carried by a user plane such as a PRACH channel configuration
  • configuration information of the UE in the source cell MAC, PHY configuration, the MAC and PHY configuration of the UE in the source cell may change due to user plane switching;
  • the UE is configured to receive configuration information of the cell carried by the user plane: MAC, PHY configuration;
  • Bearer information for user plane switching such as DRB ID, LCID, etc.
  • DRB ID Information about the user's face that needs to be released, such as the DRB ID
  • Security configuration the encryption algorithm and key information that the UE needs to use
  • the Macro eNB sends the sequence number (SN) status information of the current data (eg, the sequence number of the downlink data packet that was not successfully transmitted, the first sequence number that the Local eNB can allocate, etc.) to the Local eNB; In order to ensure that the serial numbers of data sent and received by the Macro and Local eNB are continuous, packet loss or recurrence is avoided.
  • SN sequence number
  • the Macro eNB may send the downlink data packet that it receives from the core network but has not successfully sent to the UE to the Local eNB, so that the Local eNB transmits it to the UE; similarly, the Macro eNB can collect itself from the air interface.
  • the UE uplink data packet with the sequence number discontinuous (the air interface transmission error may cause the packet sent after the UE to be sent earlier than the packet sent by the Macro eNB to be successfully received, causing the Macro eNB to receive the sequence number discontinuous) to be sent to the Local eNB, so that the Local After receiving the missing data packet retransmitted by the UE, the eNB sends the serial number consecutive data packet to the core network.
  • the UE sends a preamble (Preamble) to the Local eNB to establish uplink synchronization with the Local eNB.
  • Preamble a preamble
  • the UE synchronizes with the Macro serving cell, and the Local The cell establishes synchronization.
  • the parameter configuration carried by the user plane is completed.
  • the UE receives the command for the user plane to perform the user plane handover, the UE generates a set of MAC and PHY entities corresponding to the Local eNB according to the configuration information of the cell carried in the user plane, and all the bearers of the user plane that need to be switched. Will be multiplexed onto the set of MAC and PHY entities for transmission;
  • the UE receives the configuration information corresponding to the Macro cell, the existing MAC and PHY entities are reconfigured, and the SRB is multiplexed onto the set of MAC and PHY entities for transmission.
  • the UE needs to be able to distinguish between LTE for user plane switching commands (both user plane and control plane switching) and user plane switching messages (user plane switching only).
  • the user plane switching message may be instructed by the lbit information to be a user plane switching message in the command used by the LTE for user plane switching, or a brand new message may be defined for it.
  • the locale B returns the response information, which carries the uplink resource allocated to the UE (for subsequent transmission) and the UE timing advance (used to adjust the uplink transmission time of the UE, and establish uplink synchronization);
  • the UE returns a user plane handover success message to the Macro eNB. Since the control plane of the UE does not perform handover, the user plane handover success message (belonging to control plane signaling) needs to be sent to the Macro eNB.
  • the MME requests the MME to perform path conversion, and the message carries:
  • Bearer information that needs to be path-converted the ID of the bearer, the TEID of the corresponding downlink GTP tunnel (that is, the TEID of the downlink S-U GTP tunnel received in step 6), and the transport layer address of the corresponding GTP tunnel.
  • the IP address of the Local eNB, the Macro eNB may obtain the transport layer address of the neighboring local eNB through the OAM configuration or the TNL (Transport Network Layer) address discovery process.
  • the Macro eNB obtains the information from step 6;
  • the MME requests the S-GW to carry the modification request, and carries the user plane transport layer address (IP address) and the downlink GTP tunnel identifier (TEID) respectively designated by the Local eNB for each UE Evolved Packet System (EPS) bearer;
  • IP address user plane transport layer address
  • TEID downlink GTP tunnel identifier
  • the S-GW performs path conversion
  • the S-GW returns a bearer modification response to the MME, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier (TEID) respectively designated by the S-GW for each UE EPS bearer;
  • IP address user plane transport layer address
  • TEID uplink GTP tunnel identifier
  • the MME After the path conversion is completed by the S-GW, the MME sends a path conversion request response to the Macro eNB; the message carries:
  • Bearer information that needs to be released The ID of the bearer.
  • the Macro eNB forwards the received path switch request response to the Local eNB.
  • the local eNB releases the corresponding bearer according to the message, and updates the TEID and the transport layer address of the uplink GTP tunnel that is carried;
  • the Local eNB notifies the Macro eNB to release the user plane resources. At this time, the user plane data transmission of the UE has been transferred to the Local eNB, and therefore, the Macro eNB may release related resources;
  • the Macro eNB releases the user plane resource.
  • Example 2 When the user moves from the coverage of the macro eNB to the coverage of the local eNB, the network may switch part of the bearer of the user plane to the Local eNB.
  • the part of the user plane and the control plane are separated.
  • the part of the user plane of the UE is connected to the control plane in the same eNB, and the part of the remaining user plane is carried in other eNBs.
  • the reason that the part of the user plane is separated from the control plane may be that, according to the handover algorithm, the Macro eNB only needs to switch part of the handover UE to other eNBs; or the handover Local eNB cannot accept all the user plane bearers that the Macro eNB wants to switch; Or both.
  • the second example has the following differences compared to the first one:
  • step 4 the Macro eNB sends the E-RAB bearer information to the Local eNB instead of the handover UE: that is, the Macro eNB only wants to switch part of the bearer of the UE's user plane to the Local eNB; or:
  • step 6 the Local eNB cannot accept all bearers that the Macro eNB wishes to handover to the Local eNB.
  • step 7 the Macro eNB only informs the handover UE to switch the bearer accepted by the Local eNB to Local e B.
  • the UE After receiving the command for the user plane to switch the user plane, the UE generates a set of MAC and PHY entities corresponding to the Local eNB according to the configuration information of the cell carried in the user plane, and all the user planes that need to be switched
  • the payload will be multiplexed onto the set of MAC and PHY entities for transmission; if the UE receives configuration information corresponding to the source cell, the existing MAC and PHY entities are reconfigured, and the SRB and the unswitched DRB will be Multiplexed to the set of MAC and PHY entities for transmission.
  • the local e B can be accessed only when the UE is close to the local eNB. Because the distance is close, the local eNB to the UE's signal shield is often better than the macro to the UE's channel shield. Therefore, it is suitable to use high-order modulation and coding to transmit data, and the data transmission rate is high. However, the coverage of the local eNB is small, and if the UE moves quickly, the local coverage is removed. Therefore, the UE frequently switches, causing some data packet loss and transmission delay.
  • the Macro eNB can determine which user plane bearers of the UE are to be handed over to the Local eNB according to the QoS requirements and traffic.
  • Example 3 When the user moves out of the coverage of the Local eNB, the network needs to replace the user plane transport node with Macro e B.
  • the method for handover from a local cell to a macro cell includes the following steps: Before performing the process of FIG. 18, the UE maintains a connection with a Macro eNB and a Local eNB, and the control plane connection is located in the Macro eNB, all Or part of the bearer of the user plane is located in the Local eNB.
  • the Macro eNB performs measurement configuration on the UE, and the UE performs measurement according to the received measurement configuration information;
  • the UE measures the result.
  • the measurement result will be used to assist the Macro eNB in making handover decisions;
  • the Macro eNB performs measurement decisions. If the Macro eNB decides to perform a user plane switch, continue with the subsequent steps;
  • the Macro eNB acts as a Local eNB for user plane handover, and accepts the user plane bearer of the UE;
  • the Macro eNB After the admission is successful, the Macro eNB notifies the Local eNB to suspend the user plane data transmission;
  • the Local eNB sends the sequence number status information of the current data transmission to the Macro eNB (eg, the sequence number of the downlink data packet that was not successfully transmitted, the first sequence number that the Local eNB can allocate, etc.) to the Macro eNB; In order to ensure that the sequence numbers of the data sent and received by the Macro and Local eNB are consecutive, packet loss or recurrence is avoided.
  • the Local eNB forwards the downlink data that has not been successfully sent to the UE to the Macro eNB and has not yet submitted to the Serving GW. Upstream data. This process is similar to the data forwarding process in LTE.
  • the Macro eNB generates user plane handover signaling and sends it to the UE, where the message carries:
  • Configuration information of the UE in the Macro eNB cell MAC, PHY configuration, UE in the Macro eNB cell
  • MAC and PHY configurations may change due to user plane switching
  • Bearer information for user plane switching such as DRB ID, LCID, etc.
  • the bearer is originally transmitted in a macro, such as a VoIP bearer, so the user plane switch has no effect on the bearer.
  • the UE deletes the MAC and PHY entity corresponding to the Local eNB according to the received user plane handover signaling, enables the newly received configuration on the MAC and PHY entities corresponding to the Macro eNB; and multiplexes the handover bearer to and
  • the MAC and PHY entities corresponding to the Macro eNB delete the bearers that need to be released, and return a user plane handover completion message to the network.
  • the macro eNB initiates a path switching request to the MME, and carries a user plane transport layer address (IP address) and a downlink GTP tunnel identifier (TEID) respectively designated by the Local eNB for each UE EPS bearer.
  • IP address user plane transport layer address
  • TEID downlink GTP tunnel identifier
  • the MME requests the S-GW bearer modification request, and carries the user plane transport layer address (IP address) and the downlink GTP tunnel identifier (TEID) respectively designated by the Macro eNB for each UE EPS bearer;
  • IP address user plane transport layer address
  • TEID downlink GTP tunnel identifier
  • the S-GW performs path conversion
  • the S-GW returns a bearer modification response to the MME, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier (TEID) respectively designated by the S-GW for each UE EPS bearer;
  • IP address user plane transport layer address
  • TEID uplink GTP tunnel identifier
  • the MME returns a path switch response to the Macro eNB, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier (TEID) respectively designated by the S-GW for each UE EPS bearer;
  • IP address user plane transport layer address
  • TEID uplink GTP tunnel identifier
  • the path switch is completed. Thereafter, the downlink data packet sent to the UE, the S-GW sends it to the user plane transport layer address (IP address) specified by the corresponding Local eNB according to the bearer to which it belongs, and sets the downlink GTP tunnel identifier (TEID);
  • IP address user plane transport layer address
  • TEID uplink GTP tunnel identifier
  • the Macro eNB sends a UE context release request to the Local eNB;
  • the Local eNB releases the associated resources allocated for the handover UE.
  • step 7 can occur before steps 5 and 6.
  • Example 4 The process of the UE switching from local e B2 to local eNB 1.
  • the method for handover from a local cell to a local cell in the embodiment of the present invention includes the following steps: 1.
  • the Macro eNB performs measurement configuration on the UE, and the UE performs measurement according to the received measurement configuration information; 2.
  • the measurement result is 4 UE on the UE. The measurement result will be used to assist the Macro eNB in making handover decisions;
  • the Macro eNB performs measurement decisions. If the Macro eNB decides to switch, continue with the subsequent steps;
  • the macro eNB sends a user plane handover request to the local eNB 1, and carries:
  • All E-RAB bearer information of the UE including the bearer ID, the QoS parameter, the TEID of the corresponding uplink GTP tunnel, and the transport layer address of the uplink GTP tunnel (S-GW);
  • the lower layer configuration information of the UE in the Macro eNB includes: PDCP, RLC layer configuration, and the like.
  • the macro eNB triggers the migration of the UE user plane bearer through the user plane handover request message. Separate the user plane and control plane bearer.
  • the Local eNB1 refers to the message and performs an admission decision according to the QoS information of the bearer to be admitted. If the Local eNB allows the UE to be admitted, the underlying configuration is performed to prepare for the handover;
  • the Local eNB1-decision can accept the handover UE, generate a user plane handover request response, the message carrying:
  • the E-RAB bearer information that is allowed to be received the ID of the bearer, the TEID and the transport layer address of the GTP tunnel corresponding to the uplink forwarded E-RAB bearer; the corresponding TEID and transport layer address of the GTP tunnel before the downlink; The TEID and transport layer address of the GTP tunnel carried by the downlink S1-U; the E-RAB bearer information rejected by the receiver: including the bearer ID;
  • the lower layer configuration information of the cell that the UE is in the user plane including: MAC, PHY layer configuration; configuration information of the cell that is carried by the user plane: such as a PRACH channel configuration;
  • the Macro eNB After the admission is successful, the Macro eNB notifies Local e B2 to suspend the user plane data transmission;
  • 8 ⁇ ocal e B2 sends the sequence number status information of the current data transmission to the Macro eNB (eg, the sequence number of the downlink data packet that was not successfully transmitted, the first sequence number that the Local eNB can allocate, etc.) is sent to the Macro eNB;
  • the state is to ensure that the sequence numbers of the data sent and received by the Local eNB 1 and the Local e B2 are consecutive, and the packet loss or the recurrence is avoided.
  • the macro eNB generates user plane handover signaling and sends it to the UE, where the message carries:
  • Configuration information of the UE in the Local eNB1 cell MAC, PHY configuration
  • Bearer information for user plane switching such as DRB ID, LCID, etc.
  • DRB ID Information about the user's face that needs to be released, such as the DRB ID
  • the bearer is originally transmitted on the Macro eNB, such as a VoIP bearer, so the user plane switch has no effect on the bearer.
  • the UE deletes the MAC and PHY corresponding to the local e B2 according to the received user plane handover signaling; and establishes a MAC and a PHY corresponding to the local eNB1;
  • the UE sends a preamble (Preamble) to the Local eNB1 to establish an uplink synchronization with the Local eNB1. Specifically, after receiving the message, the UE establishes a synchronization with the Macro eNB serving cell and establishes a cell with the Local eNB1. Synchronize. According to the parameters in the message 9, the parameter configuration carried on the user plane is completed. After the UE receives the command for the user plane to perform the user plane handover, the UE generates a set of MAC and PHY entities corresponding to the Local eNB1 according to the configuration information of the cell carried in the user plane, and all the bearers of the user plane that need to be switched. Will be recovered Used on the set of MAC and PHY entities for transmission;
  • the UE needs to be able to distinguish between LTE for user plane switching commands (both user plane and control plane switching) and user plane switching messages (user plane switching only).
  • the user plane switching message may be instructed by the lbit information to be a user plane switching message in the command used by the LTE for user plane switching, or a brand new message may be defined for it.
  • Local e Bl returns response information, carrying uplink resources allocated for the UE (for subsequent transmission) and UE timing advance (for adjusting the uplink transmission time of the UE, establishing uplink synchronization);
  • the UE returns a user plane handover success message to Macro e B. Since the control plane of the UE does not perform handover, the user plane handover success message (belonging to control plane signaling) needs to be sent to the Macro e B.
  • the MME requests the MME to perform path conversion, and the message carries:
  • Bearer information that needs to be path-converted the ID of the bearer, the TEID of the corresponding downlink GTP tunnel (that is, the TEID of the downlink S-U GTP tunnel received in step 6), and the transport layer address of the corresponding GTP tunnel.
  • the IP address of the Local eNB1, the Macro eNB may obtain the transport layer address of the neighboring local eNB through the OAM configuration or the TNL address discovery process. The Macro eNB obtains this information from step 6;
  • step 14 the macro notifies the MME that the transport layer address and the TEID allocated by the local eNB1 are obtained by the macro eNB in step 6.
  • the MME requests the S-GW bearer modification request, and carries the user plane transport layer address (IP address) and the downlink GTP tunnel identifier (TEID) respectively designated by the Local eNB for each UE EPS bearer;
  • IP address user plane transport layer address
  • TEID downlink GTP tunnel identifier
  • the S-GW performs path conversion
  • the S-GW returns a bearer modification response to the MME, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier (TEID) respectively designated by the S-GW for each UE EPS bearer;
  • IP address user plane transport layer address
  • TEID uplink GTP tunnel identifier
  • the MME After the path conversion is completed by the S-GW, the MME sends a path switch request response to the Macro eNB; the message carries:
  • Bearer information that needs to be released The ID of the bearer.
  • the Macro eNB sends a UE context release request to the Local eNB2;
  • Local e B2 releases the relevant resources allocated for the handover UE.
  • 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 present invention is directed to a flowchart of a method, apparatus (system), and computer program product according to an embodiment of the present invention. And / or block diagram to describe. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device.
  • 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,特别涉及一种进行切换的方法、系统和设备,用以解决现有技术中存在的E-UTRAN的网络架构中,由于UE的切换频率和次数都大大增加,从而增加了UE在进行切换时发生通信中断的风险的问题。本发明实施例提供的一种进行切换的方法包括:用户设备接收到来自宏基站的需要进行切换的通知;所述用户设备将控制面保持在宏基站,并将用户面的部分或全部承载切换到至少一个基站上。由于本发明实施例降低了用户设备进行控制面切换的次数,从而在E-UTRAN的网络架构中UE的切换频率和次数增加情况下,降低了UE在进行切换时发生通信中断的风险。

Description

一种进行切换的方法、 系统和设备 本申请要求在 2012年 6月 28日提交中国专利局、 申请号为 201210220244.1、发明名称 为"一种进行切换的方法、 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, 特别涉及一种进行切换的方法、 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 1-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, 包括移动性管理和承载管理功能。
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 1-U接口 为 UE 提供用户面服务, UE 的用户 面数据通过 S 1-U 通用分组无线业务 (General Packet Radio Service , GPRS)隧道协议 ( GPRS Tunneling Protocol , GTP )承载在 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。 SRB属于控制面承载, DRB属于 用户面承载。
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 控制的小区和 Local eNB控制的小区之间切换。 由于 UE的切换频率和次数都大大增加, 从而增加了 UE在进行切换时发生通信中断的风险。
综上所述, 目前 E-UTRAN的网络架构中, 由于 UE的切换频率和次数都大大增加, 从而增加了 UE在进行切换时发生通信中断的风险。 发明内容
本发明实施例提供的一种进行切换的方法、 系统和设备, 用以解决现有技术中存在的 在 E-UTRAN的网络架构中由于 UE的切换频率和次数都大大增加导致增加了 UE在进行 切换时发生通信中断的风险的问题。
本发明实施例提供的一种进行切换的方法, 包括:
用户设备接收到来自宏基站的需要进行切换的通知;
所述用户设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个 基站上。
本发明实施例提供的另一种进行切换的方法, 包括:
宏基站确定用户设备需要进行切换;
所述宏基站向所述用户设备发送用于进行用户面切换的命令, 用于通知所述用户设备 将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
本发明实施例提供的又一种进行切换的方法, 包括:
本地基站接收来自宏基站的针对用户设备的用户面切换请求消息;
所述本地基站接纳用户面的部分或全部承载。
本发明实施例提供的一种进行切换的用户设备, 该用户设备包括:
第一接收模块, 用于接收来自宏基站的用于进行用户面切换的命令;
第一处理模块, 用于将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至 少一个基站上。 本发明实施例提供的一种进行切换的宏基站, 包括:
确定模块, 用于确定用户设备需要进行切换;
第二处理模块, 用于向所述用户设备发送用于进行用户面切换的命令, 用于通知所述 用户设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
本发明实施例提供的一种进行切换的本地基站, 包括:
第二接收模块, 用于接收来自宏基站的针对用户设备的用户面切换请求消息; 第三处理模块, 用于接纳用户面的部分或全部承载。
本发明实施例提供的一种进行切换的系统, 包括:
宏基站, 用于向用户设备发送用于进行用户面切换的命令, 用于通知所述用户设备将 控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上;
用户设备, 用于接收来自宏基站的用于进行用户面切换的命令, 将控制面保持在宏基 站, 并将用户面的部分或全部承载切换到至少一个基站上。
由于本发明实施例降低了用户设备进行控制面切换的次数, 从而在 E-UTRAN的网络 架构中 UE的切换频率和次数增加情况下, 降低了 UE在进行切换时发生通信中断的风险。 附图说明
图 1为背景技术中 E-UTRAN的网络架构示意图;
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为本发明实施例用户面和控制面分离的网络架构;
图 6为本发明实施例用户面和控制面完全分离的示意图;
图 7为本发明实施例用户面和控制面部分分离的示意图;
图 8为本发明实施例 UE与网络之间的用户面协议栈示意图;
图 9为本发明实施例 UE与网络之间的控制面协议栈示意图;
图 10为本发明实施例进行切换的系统结构示意图;
图 11为本发明实施例进行切换的系统中用户设备的结构示意图;
图 12为本发明实施例进行切换的系统中宏基站的结构示意图;
图 13为本发明实施例进行切换的系统中本地基站的结构示意图;
图 14为本发明实施例用户设备进行切换的方法流程示意图;
图 15为本发明实施例宏基站针对用户设备切换进行处理的方法流程示意图; 图 16为本发明实施例本地基站针对用户设备切换进行处理的方法流程示意图; 图 17为本发明实施例将全部控制面承载从宏小区切换到本地小区的方法流程示意图; 图 18为本发明实施例从本地小区切换到宏小区的方法流程示意图;
图 19为本发明实施例从本地小区切换到本地小区的方法流程示意图。 具体实施方式
本发明实施例在宏小区和本地小区重叠覆盖区域的用户设备接收到来自宏基站的需 要进行切换的通知; 用户设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换 到至少一个基站上。 由于本发明实施例降低了用户设备进行控制面切换的次数, 从而在 E-UTRAN的网络架构中 UE的切换频率和次数增加情况下,降低了 UE在进行切换时发生 通信中断的风险。
其中,宏基站是 LTE宏基站;本地基站是 LTE的微基站( Pico e B )或家庭基站( Home e B )或中继 (Relay)设备等。
为了降低 UE在 Macro eNB小区和 Local eNB小区之间进行切换的频率, 一种用户面 和控制面分离的网络部署方式被引入。如图 5所示,在该方式下, 当 UE在只有 Macro eNB 小区覆盖的区域, UE的控制面连接和用户面都连接到 Macro eNB;当 UE移动到 Macro eNB 小区和 Local eNB小区重叠覆盖区域时,UE用户面全部或者部分承载被转移到 Local eNB, 以获得更高的业务传输速率; 控制面连接仍然保持在 Macro eNB , 以防止控制面连接切换 失败造成 UE掉话。
在 UE用户面和控制面分离的情况下, UE同时连接到两个或多个 e B。 如图 6所示, UE同时与 Macro和 Local eNB相连, 分别获得控制面和用户面连接。
用户面与控制面分离还可以釆用图 7所示的形式, UE的用户面的部分承载与控制面 分离。 例如: 用于承载语音等对中断时间敏感, 对带宽需求小的业务的用户面承载维持在 Macro eNB; 用于承载上网等对中断时间不敏感, 对带宽需求大的业务的用户面承载维持 在 Local e Bo
用户面和控制面分离情况下, UE与网络之间的协议栈如图 8和图 9所示。 UE的用户 面 eNB ( Local eNB ) 为 UE提供用户面数据传输功能, 其没有与 UE对等的 RRC层, 不 能对 UE进行 RRC控制; UE的控制面 eNB ( Macro eNB ) 为 UE提供控制面消息传输功 能, 为了实现对 RRC消息的承载和处理, 控制面 eNB需要具备与 UE对等的用户面协议 栈; 由于 NAS消息需要由 RRC消息承载, 所以, UE的服务 MME与 UE的控制面 eNB 相连。
作为一种增强, UE和用户面 eNB之间可能存在部分 RRC功能, 如 UE可以读取用户 面 eNB发送的广播消息 ( eNB传输到多个 UE的点到多点的 RRC消息)。
为了支持上述用户面和控制面分离的架构, 本发明釆用与之对应的用户面节点切换方 法。 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 10所示,本发明实施例进行切换的系统包括下列步骤:宏基站 10和用户设备 20。 宏基站 10, 用于向用户设备 20发送用于进行用户面切换的命令, 用于通知用户设备 20将控制面保持在宏基站 10, 并将用户面的部分或全部承载(即部分或全部的 DRB )切 换到至少一个基站上;
用户设备 20, 用于接收来自宏基站的用于进行用户面切换的命令, 将控制面保持在宏 基站, 并将用户面的部分或全部承载切换到至少一个基站上。
较佳地, 本发明实施例的用户设备可以在宏小区和本地小区重叠覆盖区域内。
在实施中, 宏基站 10向用户设备 20发送用户面切换消息, 用于通知用户设备将控制 面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上;
相应的, 用户设备 20接收到来自宏基站的需要进行切换的用户面切换消息后, 将控 制面保持在宏基站 10, 并将用户面的部分或全部承载切换到至少一个基站上。
为了与现有的 LTE用于进行用户面切换的命令 (即用户面和控制面全部切换)进行区 分, 宏基站 10可以在用户面切换消息中增加用于指示进行用户面切换的信息, 比如釆用 lbit信息指示其为用户面切换消息。 还可以构建一个全新的用户面切换消息。
其中, 将用户面的部分或全部承载切换到至少一个基站上, 这里的基站包括但不限于 下列基站中的部分或全部: 宏基站和本地基站。
在实施中, 宏基站 10还要向需要接纳用户面的本地基站发送用户面切换请求消息; 相应的, 本发明实施例的系统还可以进一步包括: 本地基站 30。
本地基站 30, 用于接收来自宏基站的针对用户设备的用户面切换请求消息, 接纳用户 面的部分或全部 7 载。
下面按照不同的场景进行详细说明。
场景一、 进行切换是将用户面的部分或全部承载与控制面分离, 即将用户面的部分或 全部承载从宏基站切换到至少一个本地基站。
具体的, 宏基站 10向需要接纳用户面的承载的本地基站 30发送包含用户设备需要进 行切换的演进接入无线承载( Evolved Radio Access Bearer, E-RAB ) 的承载信息的用户面 切换请求消息;
本地基站 30根据用户设备需要进行切换的 E-RAB 的承载信息, 确定能够接纳的
E-RAB,并向宏基站 10返回包含允许接纳的 E-RAB承载信息的用户面切换请求响应消息; 宏基站 10根据收到的来自本地基站的用户面切换请求响应消息, 生成用户面切换消 息。
较佳地, 用户面切换请求响应消息包括但不限于下列信息中的至少一种:
被成功接纳的承载的 ID;
接纳用户面的承载的小区接纳的 E-RAB承载对应的上行前转承载 GTP隧道的隧道端 点标识( Tunnel Endpoint Identifier, TEID )和传输层地址;
接纳用户面的承载的小区接纳的 E-RAB承载对应的下行前转承载 GTP隧道的 TEID 和传输层地址;
接纳用户面的 载的小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID和 传输层地址。
较佳地, 用户设备 20 收到用户面切换消息后, 在与切换前和切换后都连接的基站保 持同步的同时与切换后新连接的基站建立同步, 并才 居收到的用户面切换消息中的配置信 息, 对用户面的承载进行配置。
具体根据不同的情况可以分为四种对用户面的承载进行配置的方式。
方式一、 切换后用户设备 20连接的基站是切换前用户设备 20连接的部分基站。 比如 用户设备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A和 B。
具体的, 用户设备 20根据用户面切换消息中用户设备在切换后的基站的配置信息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用 到对应的基站的 MAC层实体和 PHY实体(即用户设备 20还可以根据用于进行用户面切 换的命令对受到影响 (复用承载发生变化的) 的 MAC和 PHY层实体进行重配)。
方式二、 切换前用户设备连接的基站是切换后用户设备连接的部分基站。 比如用户设 备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A、 B、 C和 D。
具体的, 用户设备根据用户面切换消息中用户设备在切换后的基站的配置信息, 生成 与切换前未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到 对应的基站的 MAC层实体和 PHY实体。
方式三、 切换后用户设备连接的基站与切换前用户设备连接的基站部分相同。 比如用 户设备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A和 D。
具体的, 用户设备 20根据用户面切换消息中用户设备在接纳用户面承载的小区的配 置信息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体, 且生成与切换前未连 接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到对应的基站的
MAC层实体和 PHY实体。
方式四、 切换后用户设备连接的基站与切换前用户设备连接的基站相同。 比如用户设 备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A、 8和〇。 具体的, 用户设备 20根据用户面切换消息中用户设备在接纳用户面承载的小区的配 置信息, 将需要切换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。
较佳地, 用户设备 20将需要进行切换的用户面的承载复用到与接纳用户面承载的小 区对应的 MAC层实体和 PHY实体上之后, 若收到宏基站对应的配置信息, 对宏基站对应 的 MAC层实体和 PHY实体进行重配置,并将保留在宏基站的用户面的承载复用到重配置 后的 MAC层实体和 PHY实体上; 若收到本地基站对应的配置信息, 对本地基站对应的 MAC层实体和 PHY实体进行重配置, 并将保留在本地基站的用户面的承载复用到重配置 后的 MAC层实体和 PHY实体上。
较佳地, 用户设备 20 用户设备将用户面的部分或全部承载切换到至少一个基站上之 后, 向宏基站 10返回用户面切换完成消息;
相应的,宏基站 10在收到来自用户设备的用户面切换完成消息后向 MME发送路径转 换请求, 以及在接收到来自 MME的路径转换请求响应后, 向接纳用户面承载的本地基站 30转发路径转换请求响应。 较佳地。 路径转换请求包括接纳用户面的承载的小区的传输层 地址和接纳用户面的 载的小区接纳的 E-RAB对应的下行 Sl-U^ 载的 GTP隧道的 TEID。
本地基站 30在收到来自宏基站的路径转换请求响应后, 通知宏基站 10释放切换的用 户面的承载资源;
宏基站 10在收到来自本地基站 30的释放通知后, 释放所切换承载对应的用户面的资 源。
场景二、 进行切换是将用户面的部分或全部承载与控制面聚合, 即将用户面的部分或 全部承载从至少一个本地基站切换到宏基站。
具体的, 宏基站 10在成功接纳用户设备的用户面后通知特定基站中止被被切换的用 户面承载的数据传输, 其中特定基站是切换后用户设备的用户面承载减少的基站(包括切 换后不与用户设备连接的基站、 切换后与用户设备连接的基站但是切换后比切换前用户设 备的用户面的承载数量减少的基站等);
相应的, 本地基站 30在收到来自宏基站中止用户面数据传输的通知后, 进行数据前 转过程。 具体数据前转过程可以参见 3GPP TS 36.300协议, 在此不再赘述。
较佳地, 用户面切换消息包括但不限于下列信息中的至少一种:
用户设备在宏基站的配置信息;
需要进行用户面切换的承载信息;
需要释放的用户面承载的信息;
需要删除的 PHY实体和 MAC层实体的信息。
较佳地, 用户设备 20 收到用户面切换消息后, 根据收到的用户面切换消息中的配置 信息, 对用户面的承载进行配置。 具体根据不同的情况可以分为二种对用户面的承载进行配置的方式。
方式一、 切换后用户设备 20连接的基站是切换前用户设备 20连接的部分基站。 比如 用户设备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A和 B。
具体的, 用户设备 20根据用户面切换消息中用户设备在切换后的基站的配置信息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用 到对应的基站的 MAC层实体和 PHY实体。
方式二、 切换后用户设备连接的基站与切换前用户设备连接的基站相同。 比如用户设 备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A、 8和。。 即 将本地基站中的用户面的部分承载切换到宏基站。
具体的, 用户设备 20根据用户面切换消息中用户设备在接纳用户面承载的小区的配 置信息, 将需要切换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。
较佳地, 用户设备 20将需要进行切换的用户面的承载复用到与接纳用户面承载的小 区对应的 MAC层实体和 PHY实体上之后, 若收到宏基站对应的配置信息, 对宏基站对应 的 MAC层实体和 PHY实体进行重配置, 并将保留在目标基站的 DRB复用到重配置后的 MAC层实体和 PHY实体上。
较佳地, 用户设备 20 用户设备将用户面的部分或全部承载切换到至少一个基站上之 后, 向宏基站 10返回用户面切换完成消息;
相应的,宏基站 10在收到来自用户设备的用户面切换完成消息后向 MME发送路径转 换请求, 以及在接收到来自 MME的路径转换请求响应后, 向切换后未保留用户设备的任 何用户面承载的本地基站 30发送用户设备上下文释放请求, 向切换后保留用户设备的部 分用户面承载的本地基站 30发送资源释放请求;
本地基站 30在收到来自宏基站的用户设备上下文释放请求后, 释放用户设备的所有 用户面的承载资源;
本地基站 30在收到来自宏基站的资源释放请求后, 释放切换的用户面的承载资源。 场景三、 将用户面的部分或全部承载进行本地基站间的转移, 即将用户面的部分或全 部承载从至少一个本地基站切换到至少一个本地基站。
具体的, 宏基站 10向需要接纳用户面的承载的本地基站 30发送包含用户设备需要进 行切换的 E-RAB 的承载信息的用户面切换请求消息, 以及在本地基站成功接纳用户设备 的用户面后通知特定基站中止被切换的用户面的数据传输, 其中特定基站是切换后用户设 备的用户面承载减少的基站(包括切换后不与用户设备连接的基站、 切换后与用户设备连 接的基站但是切换后比切换前用户设备的用户面的承载数量减少的基站等, 下同, 不再重 复介绍);
本地基站 30根据用户设备需要进行切换的 E-RAB 的承载信息, 确定能够接纳的 E-RAB,并向宏基站 10返回包含允许接纳的 E-RAB承载信息的用户面切换请求响应消息; 宏基站 10根据收到的来自本地基站的用户面切换请求响应消息, 生成用户面切换消 息; 以及
属于特定基站的本地基站 30在收到来自宏基站中止用户面数据传输的通知后, 进行 数据前转过程。 具体数据前转过程可以参见 3GPP TS 36.300协议, 在此不再赘述。
较佳地, 用户面切换请求响应消息包括但不限于下列信息中的至少一种:
接纳承载的 ID;
拒绝的承载 ID;
接纳用户面的承载的小区接纳的 E-RAB承载对应的上行前转承载 GTP隧道的 TEID 和传输层地址;
接纳用户面的承载的小区接纳的 E-RAB承载对应的下行前转承载 GTP隧道的 TEID 和传输层地址;
接纳用户面的 载的小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID和 传输层地址。
较佳地, 用户面切换消息包括但不限于下列信息中的至少一种:
用户设备在宏基站的配置信息;
需要进行用户面切换的承载信息, 如承载的 ID;
需要释放的用户面承载的信息, 如承载的 ID;
需要删除的 PHY实体和 MAC层实体的信息。
较佳地, 用户设备 20 收到用户面切换消息后, 在与切换前和切换后都连接的基站保 持同步的同时与切换后新连接的基站建立同步, 并才 居收到的用户面切换消息中的配置信 息, 对用户面的承载进行配置。
具体根据不同的情况可以分为四种对用户面的承载进行配置的方式。
方式一、 切换后用户设备 20连接的基站是切换前用户设备 20连接的部分基站。 比如 用户设备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A和
具体的, 用户设备 20根据用户面切换消息中用户设备在切换后的基站的配置信息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用 到对应的基站的 MAC层实体和 PHY实体。
方式二、 切换前用户设备连接的基站是切换后用户设备连接的部分基站。 比如用户设 备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A、 B、 C和 D。
具体的, 用户设备根据用户面切换消息中用户设备在切换后的基站的配置信息, 生成 与切换前未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到 对应的基站的 MAC层实体和 PHY实体。 方式三、 切换后用户设备连接的基站与切换前用户设备连接的基站部分相同。 比如用 户设备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A和 D。
具体的, 用户设备 20根据用户面切换消息中用户设备在接纳用户面承载的小区的配 置信息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体, 且生成与切换前未连 接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。
方式四、 切换后用户设备连接的基站与切换前用户设备连接的基站相同。 比如用户设 备 20切换前连接的是基站 A、 B和 C, 切换后用户设备 20连接的基站是 A、 8和。。 即 将至少一个基站中的用户面的部分承载切换到已连接的其他本地基站上。
具体的, 用户设备 20根据用户面切换消息中用户设备在接纳用户面承载的小区的配 置信息, 将需要切换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。
较佳地, 用户设备 20将需要进行切换的用户面的承载复用到与接纳用户面承载的小 区对应的 MAC层实体和 PHY实体上之后, 若收到本地基站对应的配置信息, 对本地基站 对应的 MAC层实体和 PHY实体进行重配置,并将保留在宏基站的用户面的承载复用到重 配置后的 MAC层实体和 PHY实体上。
较佳地, 用户设备 20 用户设备将用户面的部分或全部承载切换到至少一个基站上之 后, 向宏基站 10返回用户面切换完成消息;
相应的,宏基站 10在收到来自用户设备的用户面切换完成消息后向 MME发送路径转 换请求, 以及在接收到来自 MME的路径转换请求响应后, 向接纳用户面承载的本地基站 30转发路径转换请求响应 (这里转发路径转换请求响应有两个目的: 通知基站其与 S-GW 的下行 GTP隧道建立成功;通知基站 S-GW的传输层地址, 以及为承载所分配的上行隧道 端口标识 TEID。 此后, e B可以根据 S-GW的传输层地址和 TEID给 S-GW发送上行数 据), 以及向切换后未保留用户设备的全部用户面承载的本地基站 30发送用户设备上下文 释放请求, 向切换后保留用户设备的部分用户面承载的本地基站 30发送资源释放请求; 较佳地。 路径转换请求包括接纳用户面的承载的小区的传输层地址和接纳用户面的承载的 小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID。
本地基站 30在收到来自宏基站的用户设备上下文释放请求后, 释放用户设备的所有 用户面的承载资源;
本地基站 30在收到来自宏基站的资源释放请求后, 释放切换的用户面的承载资源。 如图 11所示, 本发明实施例进行切换的系统中的用户设备包括: 第一接收模块 1100 和第一处理模块 1110。
第一接收模块 1100, 用于接收来自宏基站的用于进行用户面切换的命令;
第一处理模块 1110, 用于将控制面保持在宏基站, 并将用户面的部分或全部承载切换 到至少一个基站上。
其中,所述第一接收模块 1100可以是天线等接收模块,第一处理模块 1110可以是 CPU (通用处理器)、 DSP (数字信号处理器)或者 FPGA (可编程逻辑门阵列)。
较佳地, 第一接收模块 1100接收到的用于进行用户面切换的命令是用户面切换消息。 若进行切换是将用户面的部分或全部承载与控制面分离或将用户面的部分或全部承 载进行本地基站间的转移;第一处理模块 1110在与切换前和切换后都连接的基站保持同步 的同时与切换后新连接的基站建立同步, 并才 居收到的用户面切换消息中的配置信息, 对 用户面的承载进行配置。
若进行切换是将用户面的部分或全部承载与控制面聚合;
第一处理模块 1110根据收到的用户面切换消息中的配置信息,对用户面的承载进行配 置。
较佳地, 第一处理模块 1110具体用于:
若切换后用户设备连接的基站是切换前用户设备连接的部分基站, 根据用户面切换消 息中用户设备在切换后的基站的配置信息, 删除切换后未连接的基站对应的 MAC层实体 和 PHY实体;
若切换前用户设备连接的基站是切换后用户设备连接的部分基站, 根据用户面切换消 息中用户设备在切换后的基站的配置信息, 生成与切换前未连接的基站对应的 MAC层实 体和 PHY实体;
若切换后用户设备连接的基站与切换前用户设备连接的基站部分相同, 根据用户面切 换消息中用户设备在接纳用户面承载的小区的配置信息, 删除切换后未连接的基站对应的
MAC层实体和 PHY实体,且生成与切换前未连接的基站对应的 MAC层实体和 PHY实体; 若切换后用户设备连接的基站与切换前用户设备连接的基站相同, 根据用户面切换消 息中用户设备在接纳用户面承载的小区的配置信息, 将需要切换的用户面承载复用到对应 的基站的 MAC层实体和 PHY实体。
较佳地,第一处理模块 1110将需要进行切换的用户面的承载复用到与接纳用户面承载 的小区对应的 MAC层实体和 PHY实体上之后, 在收到宏基站对应的配置信息后, 对宏基 站对应的 MAC层实体和 PHY实体进行重配置,并将保留在宏基站的用户面的承载复用到 重配置后的 MAC层实体和 PHY实体上。
较佳地, 第一处理模块 1110将用户面的部分或全部承载切换到至少一个基站上之后, 向宏基站返回用户面切换完成消息。
如图 12所示, 本发明实施例进行切换的系统中的宏基站包括: 确定模块 1210和第二 处理模块 1220。
确定模块 1210, 用于确定用户设备需要进行切换; 第二处理模块 1220, 用于向用户设备发送用于进行用户面切换的命令, 以及通知用户 设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
其中, 所述确定模块 1210可以是 CPU (通用处理器)、 DSP (数字信号处理器)或者 FPGA (可编程逻辑门阵列); 第二处理模块 1220可以是由 CPU (通用处理器)、 DSP (数 字信号处理器)或者 FPGA (可编程逻辑门阵列), 以及射频通道和天线共同组成的装置实 现。
较佳地, 用于进行用户面切换的命令是用户面切换消息。
较佳地, 第二处理模块 1220 向用户设备发送用户面切换消息之前, 在用户面切换消 息中增加用于指示进行用户面切换的信息。
较佳地, 若进行切换是将用户面的部分或全部承载与控制面分离; 第二处理模块 1220 向用户设备发送用户面切换消息之前, 向需要接纳用户面的承载的基站发送包含用户设备 需要进行切换的 E-RAB 的承载信息的用户面切换请求消息; 根据收到的来自基站的用户 面切换请求响应消息, 生成用户面切换消息。
较佳地, 第二处理模块 1220 向用户设备发送用于进行用户面切换的命令之后, 在收 到来自用户设备的用户面切换完成消息后向 MME发送路径转换请求;在接收到来自 MME 的路径转换请求响应后, 向基站转发路径转换请求响应; 在收到来自基站的释放通知后, 释放切换的用户面的资源。
较佳地, 若进行切换是将用户面的部分或全部承载与控制面聚合; 第二处理模块 1220 向用户设备发送用户面切换消息之前, 在成功接纳用户设备的用户面后通知特定基站中止 被切换的用户面的数据传输;
其中, 特定基站是切换后用户设备的用户面承载减少的基站。
较佳地, 第二处理模块 1220 向用户设备发送用于进行用户面切换的命令之后, 在收 到来自用户设备的用户面切换完成消息后向 MME发送路径转换请求;在接收到来自 MME 的路径转换请求响应后, 向切换后未保留用户设备的全部用户面承载的特定基站发送用户 设备上下文释放请求, 以及向切换后保留用户设备的部分用户面承载的特定基站发送资源 释放请求。
较佳地, 若进行切换是将用户面的部分或全部承载进行本地基站间转移; 第二处理模 块 1220 向用户设备发送用户面切换消息之前, 向需要接纳用户面的承载的基站发送包含 用户设备需要进行切换的 E-RAB 的承载信息的用户面切换请求消息, 根据收到的来自基 站的用户面切换请求响应消息, 生成用户面切换消息; 在本地基站成功接纳用户设备的用 户面后通知特定基站中止被切换的用户面的数据传输, 其中特定基站是切换后用户设备的 用户面承载减少的基站。
较佳地, 第二处理模块 1220 向用户设备发送用于进行用户面切换的命令之后, 在收 到来自用户设备的用户面切换完成消息后向 MME发送路径转换请求;在接收到来自 MME 的路径转换请求响应后, 向接纳用户面承载的基站转发路径转换请求响应, 向切换后未保 留用户设备的全部用户面承载的特定基站发送用户设备上下文释放请求, 以及向切换后保 留用户设备的部分用户面承载的特定基站发送资源释放请求。
较佳地, 路径转换请求包括接纳用户面的承载的小区的传输层地址和接纳用户面的承 载的小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID。
如图 13所示, 本发明实施例进行切换的系统中的本地基站包括: 第二接收模块 1310 和第三处理模块 1320。
第二接收模块 1310, 用于接收来自宏基站的针对用户设备的用户面切换请求消息; 第三处理模块 1320, 用于接纳用户面的部分或全部承载。
其中, 所述第二接收模块 1310 可以由射频通道和天线共同组成的装置实现; 第三处 理模块 1320可以是 CPU (通用处理器)、 DSP (数字信号处理器)或者 FPGA (可编程逻 辑门阵列)。
较佳地, 用户面切换请求消息包括用户设备需要进行切换的 E-RAB 的承载信息; 第 三处理模块 1320根据用户设备需要进行切换的 E-RAB的承载信息, 确定接纳的 E-RAB , 并向宏基站返回包含允许接纳的 E-RAB承载信息的用户面切换请求响应消息。
较佳地, 第三处理模块 1320接纳用户面的部分或全部承载之后, 在收到来自宏基站 的路径转换请求响应后, 通知宏基站释放切换的用户面的承载资源。
较佳地, 第三处理模块 1320基站接纳用户面的部分或全部承载之后, 在收到来自宏 基站中止用户面数据传输的通知后, 进行数据前转过程。
较佳地, 第三处理模块 1320进行数据前转过程之后, 在收到来自宏基站的用户设备 上下文释放请求后, 释放用户设备的所有用户面的承载资源。
基于同一发明构思, 本发明实施例中还提供了用户设备进行切换的方法、 宏基站针对 用户设备切换进行处理的方法, 以及本地基站针对用户设备切换进行处理的方法, 由于这 些方法解决问题的原理与图 10本发明实施例进行切换的系统相似, 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 14所示, 本发明实施例用户设备进行切换的方法包括下列步骤:
步骤 1401、 用户设备接收来自宏基站的用于进行用户面切换的命令;
步骤 1402、 用户设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至 少一个基站上。
较佳地, 步骤 1402 中, 用户设备接收到来自宏基站的需要进行切换的用户面切换消 息后, 将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
下面按照不同的场景进行详细说明。 场景一、 进行切换是将用户面的部分或全部承载与控制面分离, 即将用户面的部分或 全部承载从宏基站切换到至少一个本地基站。
步骤 1402 中, 在与切换前和切换后都连接的基站保持同步的同时与切换后新连接的 基站建立同步, 并根据收到的用户面切换消息中的配置信息, 对用户面的承载进行配置。
具体根据不同的情况可以分为四种对用户面的承载进行配置的方式。
方式一、 切换后用户设备连接的基站是切换前用户设备 20连接的部分基站。
具体的, 用户设备根据用户面切换消息中用户设备在切换后的基站的配置信息, 删除 切换后未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到对 应的基站的 MAC层实体和 PHY实体。
方式二、 切换前用户设备连接的基站是切换后用户设备连接的部分基站。
具体的, 用户设备根据用户面切换消息中用户设备在切换后的基站的配置信息, 生成 与切换前未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到 对应的基站的 MAC层实体和 PHY实体。
方式三、 切换后用户设备连接的基站与切换前用户设备连接的基站部分相同。
具体的, 用户设备根据用户面切换消息中用户设备在接纳用户面承载的小区的配置信 息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体, 且生成与切换前未连接的 基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到对应的基站的 MAC 层实体和 PHY实体。
方式四、 切换后用户设备连接的基站与切换前用户设备连接的基站相同。
具体的, 用户设备根据用户面切换消息中用户设备在接纳用户面承载的小区的配置信 息, 将需要切换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。
较佳地, 用户设备将需要进行切换的用户面的承载复用到与接纳用户面承载的小区对 应的 MAC层实体和 PHY实体上之后, 若收到宏基站对应的配置信息, 对宏基站对应的 MAC层实体和 PHY实体进行重配置, 并将保留在宏基站的用户面的承载复用到重配置后 的 MAC层实体和 PHY实体上。
较佳地, 用户设备用户设备将用户面的部分或全部承载切换到至少一个基站上之后 , 向宏基站返回用户面切换完成消息。
场景二、 进行切换是将用户面的部分或全部承载与控制面聚合, 即将用户面的部分或 全部承载从至少一个本地基站切换到宏基站。
较佳地,用户设备收到用户面切换消息后,根据收到的用户面切换消息中的配置信息, 对用户面的承载进行配置。
具体根据不同的情况可以分为二种对用户面的承载进行配置的方式。
方式一、 切换后用户设备连接的基站是切换前用户设备 20连接的部分基站。 具体的, 用户设备根据用户面切换消息中用户设备在切换后的基站的配置信息, 删除 切换后未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到对 应的基站的 MAC层实体和 PHY实体。
方式二、 切换后用户设备连接的基站与切换前用户设备连接的基站相同。
具体的, 用户设备根据用户面切换消息中用户设备在接纳用户面承载的小区的配置信 息, 将需要切换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。
较佳地, 用户设备将需要进行切换的用户面的承载复用到与接纳用户面承载的小区对 应的 MAC层实体和 PHY实体上之后, 若收到宏基站对应的配置信息, 对宏基站对应的 MAC层实体和 PHY实体进行重配置, 并将保留在宏基站的用户面的承载复用到重配置后 的 MAC层实体和 PHY实体上。
较佳地, 用户设备用户设备将用户面的部分或全部承载切换到至少一个基站上之后 , 向宏基站返回用户面切换完成消息。
场景三、 将用户面的部分或全部承载进行本地基站间的转移, 即将用户面的部分或全 部承载从至少一个本地基站切换到至少一个本地基站。
较佳地, 步骤 1402 中, 在与切换前和切换后都连接的基站保持同步的同时与切换后 新连接的基站建立同步, 并根据收到的用户面切换消息中的配置信息, 对用户面的承载进 行配置。
具体根据不同的情况可以分为四种对用户面的承载进行配置的方式。
方式一、 切换后用户设备连接的基站是切换前用户设备 20连接的部分基站。
具体的, 用户设备根据用户面切换消息中用户设备在切换后的基站的配置信息, 删除 切换后未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到对 应的基站的 MAC层实体和 PHY实体。
方式二、 切换前用户设备连接的基站是切换后用户设备连接的部分基站。
具体的, 用户设备根据用户面切换消息中用户设备在切换后的基站的配置信息, 生成 与切换前未连接的基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到 对应的基站的 MAC层实体和 PHY实体。
方式三、 切换后用户设备连接的基站与切换前用户设备连接的基站部分相同。
具体的, 用户设备根据用户面切换消息中用户设备在接纳用户面承载的小区的配置信 息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体, 且生成与切换前未连接的 基站对应的 MAC层实体和 PHY实体,将需要切换的用户面承载复用到对应的基站的 MAC 层实体和 PHY实体。
方式四、 切换后用户设备连接的基站与切换前用户设备连接的基站相同。
具体的, 用户设备根据用户面切换消息中用户设备在接纳用户面承载的小区的配置信 息, 将需要切换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。 较佳地, 用户设备将需要进行切换的用户面的承载复用到与接纳用户面承载的小区对 应的 MAC层实体和 PHY实体上之后, 若收到宏基站对应的配置信息, 对宏基站对应的 MAC层实体和 PHY实体进行重配置, 并将保留在宏基站的用户面的承载复用到重配置后 的 MAC层实体和 PHY实体上。
较佳地, 用户设备用户设备将用户面的部分或全部承载切换到至少一个基站上之后 , 向宏基站返回用户面切换完成消息。
如图 15所示, 本发明实施例宏基站针对用户设备切换进行处理的方法包括下列步骤: 步骤 1501、 宏基站确定用户设备需要进行切换;
步骤 1502、宏基站向用户设备发送用于进行用户面切换的命令, 用于通知用户设备将 控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
步骤 1501 中, 宏基站向用户设备发送用户面切换消息, 用于通知用户设备将控制面 保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
为了与现有的 LTE用于进行用户面切换的命令 (即用户面和控制面全部切换)进行区 分, 宏基站可以在用户面切换消息中增加用于指示进行用户面切换的信息, 比如釆用 lbit 信息用于指示进行用户面切换。 还可以构建一个全新的用户面切换消息。
下面按照不同的场景进行详细说明。
场景一、 进行切换是将用户面的部分或全部承载与控制面分离, 即将用户面的部分或 全部承载从宏基站切换到至少一个本地基站。
具体的, 宏基站向需要接纳用户面的承载的本地基站发送包含用户设备需要进行切换 的的承载信息的用户面切换请求消息;
较佳地, 宏基站根据收到的来自本地基站的用户面切换请求响应消息, 生成用户面切 换消息。
较佳地, 宏基站在收到来自用户设备的用户面切换完成消息后向 MME发送路径转换 请求, 以及在接收到来自 MME的路径转换请求响应后, 向接纳用户面承载的本地基站转 发路径转换请求响应。 较佳地。 路径转换请求包括接纳用户面的承载的小区的传输层地址 和接纳用户面的承载的小区接纳的 E-RAB对应的下行 S1-U承载的 GTP隧道的 TEID。
较佳地, 宏基站在收到来自基站的释放通知后, 释放切换的用户面的资源。
场景二、 进行切换是将用户面的部分或全部承载与控制面聚合, 即将用户面的部分或 全部承载从至少一个本地基站切换到宏基站。
具体的, 宏基站在成功接纳用户设备的用户面后通知特定基站中止被切换的用户面的 数据传输, 其中特定基站是切换后用户设备的用户面承载减少的基站。
较佳地, 宏基站在收到来自用户设备的用户面切换完成消息后向 MME发送路径转换 请求, 以及在接收到来自 MME的路径转换请求响应后, 向切换后未保留用户设备的全部 用户面承载的本地基站 30发送用户设备上下文释放请求, 向切换后保留用户设备的部分 用户面承载的本地基站 30发送资源释放请求;
场景三、 将用户面的部分或全部承载进行本地基站间的转移, 即将用户面的部分或全 部承载从至少一个本地基站切换到至少一个本地基站。
具体的, 宏基站向需要接纳用户面的承载的本地基站 30发送包含用户设备需要进行 切换的 E-RAB 的承载信息的用户面切换请求消息, 以及在本地基站成功接纳用户设备的 用户面后通知特定基站中止被切换的用户面的数据传输, 其中特定基站是切换后用户设备 的用户面承载减少的基站(包括切换后不与用户设备连接的基站、 切换后与用户设备连接 的基站但是切换后比切换前用户设备的用户面的承载数量减少的基站等);
较佳地, 宏基站根据收到的来自本地基站的用户面切换请求响应消息, 生成用户面切 换消息; 在收到来自用户设备的用户面切换完成消息后向 MME发送路径转换请求, 以及 在接收到来自 MME的路径转换请求响应后, 向接纳用户面承载的本地基站转发路径转换 请求响应, 以及向切换后未保留用户设备的全部用户面承载的本地基站 30发送用户设备 上下文释放请求, 向切换后保留用户设备的部分用户面承载的本地基站 30发送资源释放 请求; 较佳地。 路径转换请求包括接纳用户面的承载的小区的传输层地址和接纳用户面的 载的小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID。
其中,图 14和图 15可以合成一个流程,形成一个进行切换的方法,即先执行步骤 1501 和步骤 1502, 再执行步骤 1401和步骤 1402。
如图 16 所示, 本发明实施例本地基站针对用户设备切换进行处理的方法包括下列步 骤:
步骤 1601、 本地基站接收来自宏基站的针对用户设备的用户面切换请求消息; 步骤 1602、 本地基站接纳用户面的部分或全部承载。
较佳地, 用户面切换请求消息包括用户设备需要进行切换的 E-RAB的承载信息; 步骤 1602中, 本地基站根据用户设备需要进行切换的 E-RAB的承载信息, 确定接纳 的 E-RAB ,并向宏基站返回包含允许接纳的 E-RAB承载信息的用户面切换请求响应消息。
较佳地, 本地基站接纳用户面的部分或全部承载之后, 在收到来自宏基站的路径转换 请求响应后, 通知宏基站释放切换的用户面的承载资源。
较佳地, 本地基站接纳用户面的部分或全部承载之后, 在收到来自宏基站中止用户面 数据传输的通知后, 进行数据前转过程。
较佳地, 本地基站进行数据前转过程之后, 在收到来自宏基站的用户设备上下文释放 请求后, 释放切换的用户面的承载资源。
其中, 图 14〜图 16可以合成一个流程, 形成一个进行切换的方法, 即先执行步骤 1501 和步骤 1502, 再执行步骤 1401和步骤 1402, 最后执行步骤 1601和步骤 1602。 下面针对上述三种场景分别列举一个实例对本发明的方案进行说明。
实例一、 当用户从 macro e B的覆盖范围移动到 local e B的覆盖范围, 网络需要将 用户面传输节点替换为 Local e B。
如图 17 所示, 本发明实施例将全部控制面承载从宏小区切换到本地小区的方法包括 下列步骤:
1.Macro eNB对 UE进行测量配置, UE后继根据收到的测量配置信息执行测量; 2. 在 Macro eNB为 UE分配的上行资源上, UE上 4艮测量结果。 该测量结果将用于辅 助 Macro eNB进行切换判决;
3. Macro eNB进行测量判决。 如果 Macro eNB决定要进行切换, 继续执行后继步骤;
4. Macro eNB向 Local eNB发送用户平面切换请求, 在该消息中携带:
UE全部的 E-RAB承载信息: 包括承载的 ID, 服务盾量( Quality of Service, QoS ) 参数, 承载对应的上行 GTP隧道的 TEID, 上行 GTP隧道(S-GW ) 的传输层地址;
UE在 Macro eNB的底层配置信息, 包括: PDCP, RLC层配置等;
与 LTE现有的切换请求消息不同, Macro eNB通过用户平面切换请求消息触发对 UE 用户面承载的迁移, 实现用户面和控制面承载的分离。
5. Local eNB参考该消息, 根据待接纳的承载的 QoS信息进行接纳判决。 如果 Local eNB允许接纳该 UE的至少一条待切换承载, 则进行底层配置, 以准备切换;
6. 如果 Local eNB判决可以接纳切换 UE的至少一条待切换承载, 则生成用户面切换 请求响应, 该消息中携带:
允许接纳的 E-RAB承载信息: 包括承载的 ID, E-RAB承载对应的上行前转承载 GTP 隧道的 TEID和传输层地址; 对应的下行前转承载 GTP隧道的 TEID和传输层地址; 对应 的下行 S1-U承载的 GTP隧道的 TEID和传输层地址; 拒绝接纳的 E-RAB承载信息: 包括 承载 ID;
UE在接纳用户面承载的小区的底层配置信息, 包括: MAC, PHY层配置; 接纳用户面承载的小区的配置信息: 如物理随机接入信道(Physical Random Access Channel , PRACH )信道配置;
接纳用户面承载的小区为切换 UE 分配的调度 ID: 小区无线网络临时标识符(Cell Radio Network Temporary Identifier, C-RNTI );
7. Macro eNB 4 居步骤 6中收到的信息, 生成用户面切换信令, 发送给 UE;
该消息中携带:
接纳用户面承载的小区的配置信息: 如 PRACH信道配置;
接纳用户面承载的小区为切换 UE分配的调度 ID: C-RNTI; 可选携带, UE在源小区的配置信息: MAC, PHY配置, UE在源小区的 MAC和 PHY 配置可能由于用户面切换而发生变化;
UE在接纳用户面承载的小区的配置信息: MAC, PHY配置;
需要进行用户面切换的承载信息, 如 DRB ID, LCID等;
需要释放的用户面 载的信息, 如 DRB ID;
安全配置: UE需要使用的加密算法和密钥信息;
8. Macro eNB将当前数据发送的序列号( SN )状态信息(如: 未成功发送的下行数据 包的序列号, Local eNB可以分配的第一个序列号等)发送给 Local eNB; 传输发送状态为 了保证 Macro和 Local eNB所收发的数据的序列号连续, 避免丢包或重复发生;
第 8步之后, Macro eNB可以将自己从核心网接收的但尚未成功发送给 UE的下行数 据包发送给 Local eNB , 以便 Local eNB将其传输给 UE; 类似的, Macro eNB可以将自己 从空口收到的序列号不连续的 UE上行数据包(空口传输错误可能导致 UE后发送的包早 于先发送的包被 Macro eNB成功接收, 造成 Macro eNB收包序号不连续 )发送给 Local eNB, 以便 Local eNB在接收到 UE重发的缺少的数据包后, 将序号连续的数据包发送给 核心网。
9. UE向 Local eNB发送前导码( Preamble ), 以建立与 Local eNB的上行同步; 具体的, UE收到用户面切换信令消息后, UE在与 Macro服务小区保持同步的基础上, 与 Local小区建立同步。 并根据消息 7中的参数, 完成对用户面承载的参数配置。 UE收到 用户面用于进行用户面切换的命令后, UE根据在接纳用户面承载的小区的配置信息, 生 成一套与 Local eNB对应的 MAC和 PHY实体, 所有需要进行切换的用户面的承载将被复 用到该套 MAC和 PHY实体上, 进行传输;
如果 UE收到与 Macro小区对应的配置信息,则对现有的 MAC和 PHY实体进行重配, SRB将被复用到该套 MAC和 PHY实体上, 进行传输。
UE需要可以区分出 LTE用于进行用户面切换的命令 (用户面和控制面全部切换 )和 用户面切换消息 (仅进行用户面切换)。 为此, 用户面切换消息可以是在 LTE用于进行用 户面切换的命令中通过 lbit信息指示其为用户面切换消息, 或者为其定义全新的消息。
10. Locale B返回响应信息, 携带为 UE分配的上行资源 (用于后继传输)和 UE定 时提前量(用于调整 UE的上行发送时刻, 建立上行同步);
11. UE向 Macro eNB返回用户面切换成功消息。由于 UE的控制面不进行切换,所以, 用户面切换成功消息 (属于控制面信令) 需要发送给 Macro eNB。
12. 由 Macro eNB请求 MME进行路径转换 , 消息中携带:
需要进行路径转换的承载信息:包括承载的 ID,承载对应的下行 GTP隧道的 TEID(即 步骤 6中收到的下行 Sl-U GTP隧道的 TEID ), 承载对应的 GTP隧道的传输层地址(即 Local eNB的 IP地址, Macro eNB可以通过 OAM的配置或者 TNL( Transport Network Layer, 传输网络层) address discovery (地址发现)过程来获得邻接 local eNB的传输层地址)。 Macro eNB从步骤 6中获取这些信息;
13. MME 请求 S-GW 承载修改请求, 携带 Local eNB 为各 UE 演进分组系统 ( Evolved Packet System, EPS )承载分别指定的用户面传输层地址( IP地址 )和下行 GTP 隧道标识(TEID );
14. S-GW进行路径转换;
15. S-GW向 MME返回承载修改响应, 携带 S-GW为各 UE EPS承载分别指定的用户 面传输层地址( IP地址)和上行 GTP隧道标识( TEID );
16. 在 S-GW完成路径转换后, MME向 Macro eNB发送路径转换请求响应; 消息中携带:
需要进行路径转换的承载信息: 包括承载的 ID, 承载对应的上行 GTP隧道的 TEID, 承载对应的 GTP隧道( S-GW ) 的传输层地址。
需要释放的承载信息: 承载的 ID。
17. Macro eNB向 Local eNB转发收到的路径转换请求响应。 Local eNB根据消息, 释 放对应的承载, 更新承载的上行 GTP隧道的 TEID和传输层地址;
18. Local eNB通知 Macro eNB释放用户面资源。 此时, UE的用户面数据传输已经转 到 Local eNB , 因此, Macro eNB可以释放相关的资源;
19、 Macro eNB释放用户面资源。
实例二、 当用户从 macro eNB的覆盖范围移动到 local eNB的覆盖范围, 网络可以将 用户面的部分承载切换到 Local eNB。用户面的部分和控制面部分分离是指 UE的用户面的 部分承载与控制面连接在同一个 eNB , 剩余用户面的部分承载在其他 eNB。 造成用户面的 部分与控制面分离的原因可能是, 根据切换算法, Macro eNB仅希望切换切换 UE的部分 承载到其他 eNB; 或者切换的 Local eNB无法接纳 Macro eNB所希望切换的所有用户面承 载; 或者以上两者兼而有之。
其中, 实例二相比实例一有以下不同:
在步骤 4中, Macro eNB发送给 Local eNB的不是切换 UE全部的 E-RAB承载信息: 即 Macro eNB只希望将 UE的用户面的部分承载切换到 Local eNB; 或者:
在步骤 6中, Local eNB不能接纳 Macro eNB所希望切换到 Local eNB的全部承载。 在以上两种情况下, Macro eNB在步骤 7中, 仅通知切换 UE将被 Local eNB接纳的 载切换到 Local e B。
UE 收到用户面用于进行用户面切换的命令后, 根据在接纳用户面承载的小区的配置 信息, 生成一套与 Local eNB对应的 MAC和 PHY实体, 所有需要进行切换的用户面的承 载将被复用到该套 MAC和 PHY实体上, 进行传输; 如果 UE收到与源小区对应的配置信 息,则对现有的 MAC和 PHY实体进行重配, SRB和未切换的 DRB将被复用到该套 MAC 和 PHY实体上, 进行传输。
较佳地, 由于 local eNB的覆盖范围小, 只有 UE离 local eNB比较近的时候才能接入 local e B。 由于距离近, local eNB到 UE的信号盾量往往好于 macro 到 UE的信道盾量, 所以, 适合用高阶调制编码方式发送数据, 数据传输速率高。 但 local eNB覆盖范围小, UE如果移动很快会移出 local的覆盖范围, 因此, 会频繁切换, 造成一些数据包的丢失和 传输迟延。 比如, 如果业务数据量小, 对时延要求高, 如 VoIP, 可以在 macro传输; 如果 业务数据量大, 对时延要求低, 允许重传, 可以在 local传输, 如 FTP业务。 基于此, 步 骤 4中, Macro eNB可以根据 QoS需求和业务量, 确定希望将 UE的哪些用户面承载切换 到 Local eNB。
实例三、 当用户从 Local eNB 的覆盖范围移出, 网络需要将用户面传输节点替换为 Macro e B。
如图 18所示, 本发明实施例从本地小区切换到宏小区的方法包括下列步骤: 在执行图 18过程前, UE与 Macro eNB和 Local eNB同时保持连接, 其控制面连接位 于 Macro eNB , 全部或用户面的部分承载位于 Local eNB。
1. Macro eNB对 UE进行测量配置, UE后继根据收到的测量配置信息执行测量;
2. 在 Macro eNB为 UE分配的上行资源上, UE上 4艮测量结果。 该测量结果将用于辅 助 Macro eNB进行切换判决;
3. Macro eNB进行测量判决。 如果 Macro eNB决定要进行用户面切换, 继续执行后继 步骤;
4. Macro eNB作为用户面切换的 Local eNB, 对 UE的用户面承载进行接纳;
5. 接纳成功后, Macro eNB通知 Local eNB中止用户面数据数据传输;
6. Local eNB向 Macro eNB发送当前数据传输的序列号状态信息 (如: 未成功发送的 下行数据包的序列号, Local eNB可以分配的第一个序列号等)发送给 Macro eNB; 传输 发送状态为了保证 Macro和 Local eNB所收发的数据的序列号连续,避免丢包或重复发生; 在完成步骤 6后, Local eNB向 Macro eNB前转尚未成功发送给 UE的下行数据和尚 未递交给 Serving GW的上行数据。 该过程与 LTE中的数据前转过程类似。
7. Macro eNB生成用户面切换信令, 发送给 UE,该消息中携带:
UE在 Macro eNB小区的配置信息: MAC, PHY配置, UE在 Macro eNB小区的的
MAC和 PHY配置可能由于用户面切换而发生变化;
需要进行用户面切换的承载信息, 如 DRB ID, LCID等;
需要释放的用户面 载的信息, 如 DRB ID; 需要删除的 PHY和 MAC层实体。
在本例中, 还有一种可能: 该承载原来就在 macro传输, 如 VoIP承载, 因此, 用户 面切换对该承载没有任何影响。
8. UE根据收到用户面切换信令, 删除与 Local eNB对应的 MAC和 PHY实体, 在与 Macro eNB对应的 MAC和 PHY实体上启用新收到的配置; 并将需要切换承载复用到与
Macro eNB对应的 MAC和 PHY实体; 删除需要释放的承载, 并向网络返回用户面切换完 成消息。
9. Macro eNB向 MME发起路径转换请求, 携带 Local eNB为各 UE EPS承载分别指 定的用户面传输层地址( IP地址)和下行 GTP隧道标识( TEID );
10. MME请求 S-GW承载修改请求,携带 Macro eNB为各 UE EPS承载分别指定的用 户面传输层地址( IP地址)和下行 GTP隧道标识( TEID );
11. S-GW进行路径转换;
12. S-GW向 MME返回承载修改响应, 携带 S-GW为各 UE EPS承载分别指定的用户 面传输层地址( IP地址)和上行 GTP隧道标识( TEID );
13. MME向 Macro eNB返回路径切换响应,携带 S-GW为各 UE EPS承载分别指定的 用户面传输层地址( IP地址)和上行 GTP隧道标识( TEID );
至此, 路径切换完成。 此后, 发到 UE的下行数据包, S-GW会根据其所属承载将其 发送到对应的 Local eNB指定的用户面传输层地址( IP地址), 并设置下行 GTP隧道标识 ( TEID ); 对于 UE发出的上行数据包, Local eNB会根据其所属承载将其发送到对应的 S-GW指定的用户面传输层地址( IP地址), 并设置上行 GTP隧道标识( TEID )。
14. Macro eNB向 Local eNB发送 UE上下文释放请求;
15. Local eNB释放为切换 UE所分配的相关资源。
在上述切换过程完成后, UE的用户面和控制面都切换到了 Macro e B。 在上述过程 中, 步骤 7可以发生在步骤 5和 6之前。
实例四、 UE从 local e B2切换到 local eNB 1的过程。
如图 19所示, 本发明实施例从本地小区切换到本地小区的方法包括下列步骤: 1.Macro eNB对 UE进行测量配置, UE后继根据收到的测量配置信息执行测量; 2. 在 Macro eNB为 UE分配的上行资源上, UE上 4艮测量结果。 该测量结果将用于辅 助 Macro eNB进行切换判决;
3. Macro eNB进行测量判决。 如果 Macro eNB决定要进行切换, 继续执行后继步骤;
4. macro eNB向 local eNB 1发送用户平面切换请求, 在该消息中携带:
UE全部的 E-RAB承载信息: 包括承载的 ID, QoS参数, 承载对应的上行 GTP隧道 的 TEID, 上行 GTP隧道( S-GW ) 的传输层地址; UE在 Macro eNB (即 Macro eNB ) 的低层配置信息, 包括: PDCP, RLC层配置等; 与 LTE现有的切换请求消息不同, macro eNB通过用户平面切换请求消息触发对 UE 用户面承载的迁移, 实现用户面和控制面承载的分离。
5. Local eNBl参考该消息, 根据待接纳的承载的 QoS信息进行接纳判决。 如果 Local eNB允许接纳该 UE, 则进行底层配置, 以准备切换;
6. 如果 Local eNBl-判决可以接纳切换 UE, 则生成用户面切换请求响应, 该消息中携 带:
允许接纳的 E-RAB承载信息: 包括承载的 ID, E-RAB承载对应的上行前转承载 GTP 隧道的 TEID和传输层地址;对应的下行前转 载 GTP隧道的 TEID和传输层地址;;对应 的下行 S1-U承载的 GTP隧道的 TEID和传输层地址; 拒绝接纳的 E-RAB承载信息: 包括 承载 ID;
UE在接纳用户面承载的小区的低层配置信息, 包括: MAC, PHY层配置; 接纳用户面承载的小区的配置信息: 如 PRACH信道配置;
接纳用户面承载的小区为切换 UE分配的调度 ID: C-RNTI;
7. 接纳成功后, Macro eNB通知 Local e B2中止用户面数据传输;
8丄 ocal e B2向 Macro eNB发送当前数据传输的序列号状态信息(如: 未成功发送的 下行数据包的序列号, Local eNB可以分配的第一个序列号等)发送给 Macro eNB; 传输 发送状态为了保证 Local eNB 1和 Local e B2所收发的数据的序列号连续, 避免丢包或重 复发生;
9. Macro eNB生成用户面切换信令, 发送给 UE,该消息中携带:
UE在 Local eNBl小区的配置信息: MAC, PHY配置;
需要进行用户面切换的承载信息, 如 DRB ID, LCID等;
需要释放的用户面 载的信息, 如 DRB ID;
需要删除的 PHY和 MAC层实体。
在本例中, 还有一种可能: 该承载原来就在 Macro eNB传输, 如 VoIP承载, 因此, 用户面切换对该承载没有任何影响。
10. UE根据收到用户面切换信令,删除与 local e B2对应的 MAC和 PHY;建立与 local eNBl对应的 MAC和 PHY;
11、 UE向 Local eNBl发送前导码( Preamble ), 以建立与 Local eNBl的上行同步; 具体的, UE收到该消息后, UE在与 Macro eNB服务小区保持同步的基础上,与 Local eNBl小区建立同步。 并根据消息 9中的参数, 完成对用户面承载的参数配置。 UE收到用 户面用于进行用户面切换的命令后, UE根据在接纳用户面承载的小区的配置信息, 生成 一套与 Local eNBl对应的 MAC和 PHY实体, 所有需要进行切换的用户面的承载将被复 用到该套 MAC和 PHY实体上, 进行传输;
UE需要可以区分出 LTE用于进行用户面切换的命令 (用户面和控制面全部切换 )和 用户面切换消息 (仅进行用户面切换)。 为此, 用户面切换消息可以是在 LTE用于进行用 户面切换的命令中通过 lbit信息指示其为用户面切换消息, 或者为其定义全新的消息。
12. Local e Bl返回响应信息, 携带为 UE分配的上行资源(用于后继传输)和 UE定 时提前量(用于调整 UE的上行发送时刻, 建立上行同步);
13. UE向 Macro e B返回用户面切换成功消息。由于 UE的控制面不进行切换,所以, 用户面切换成功消息 (属于控制面信令 ) 需要发送给 Macro e B。
14. 由 Macro eNB请求 MME进行路径转换 , 消息中携带:
需要进行路径转换的承载信息:包括承载的 ID,承载对应的下行 GTP隧道的 TEID(即 步骤 6中收到的下行 Sl-U GTP隧道的 TEID ), 承载对应的 GTP隧道的传输层地址(即 Local eNBl的 IP地址, Macro eNB可以通过 OAM的配置或者 TNL address discovery过程 来获得邻接 local eNB的传输层地址)。 Macro eNB从步骤 6中获取这些信息;
步骤 14中, macro通知给 MME的是 local eNBl分配的传输层地址和 TEID,是 macro eNB在步骤 6中获得的。
15. MME请求 S-GW承载修改请求, 携带 Local eNB为各 UE EPS承载分别指定的用 户面传输层地址( IP地址)和下行 GTP隧道标识( TEID );
16. S-GW进行路径转换;
17. S-GW向 MME返回承载修改响应, 携带 S-GW为各 UE EPS承载分别指定的用户 面传输层地址( IP地址)和上行 GTP隧道标识( TEID );
18. 在 S-GW完成路径转换后, MME向 Macro eNB发送路径转换请求响应; 消息中携带:
需要进行路径转换的承载信息: 包括承载的 ID, 承载对应的上行 GTP隧道的 TEID, 承载对应的 GTP隧道( S-GW ) 的传输层地址。
需要释放的承载信息: 承载的 ID。
19. Macro eNB向 Local eNB2发送 UE上下文释放请求;
20. Local e B2释放为切换 UE所分配的相关资源。
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、 一种进行切换的方法, 其特征在于, 该方法包括:
用户设备接收来自宏基站的用于进行用户面切换的命令;
所述用户设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个 基站上。
2、 如权利要求 1 所述的方法, 其特征在于, 所述用于进行用户面切换的命令是用户 面切换消息。
3、 如权利要求 2 所述的方法, 其特征在于, 进行用户面切换是将用户面的部分或全 部承载与控制面分离或将用户面的部分或全部承载进行本地基站间的转移;
所述用户设备将用户面的部分或全部承载切换到至少一个基站上, 包括:
所述用户设备在与切换前和切换后都连接的基站保持同步的同时与切换后新连接的 基站建立同步, 并根据收到的所述用户面切换消息中的配置信息, 对用户面的承载进行配 置。
4、 如权利要求 2 所述的方法, 其特征在于, 进行用户面切换是将用户面的部分或全 部承载与控制面聚合;
所述用户设备将用户面的部分或全部承载切换到至少一个基站上, 包括:
所述用户设备根据收到的所述用户面切换消息中的配置信息, 对用户面的承载进行配 置。
5、 如权利要求 3或 4所述的方法, 其特征在于, 所述用户设备对用户面的承载进行 配置, 包括:
若切换后所述用户设备连接的基站是切换前所述用户设备连接的部分基站, 所述用户 设备根据所述用户面切换消息中所述用户设备在切换后的基站的配置信息, 删除切换后未 连接的基站对应的媒体接入控制 MAC层实体和物理层 PHY实体;
若切换前所述用户设备连接的基站是切换后所述用户设备连接的部分基站, 所述用户 设备根据所述用户面切换消息中所述用户设备在切换后的基站的配置信息, 生成与切换前 未连接的基站对应的 MAC层实体和 PHY实体;
若切换后所述用户设备连接的基站与切换前所述用户设备连接的基站部分相同, 所述 用户设备根据所述用户面切换消息中所述用户设备在接纳用户面承载的小区的配置信息, 删除切换后未连接的基站对应的 MAC层实体和 PHY实体,且生成与切换前未连接的基站 对应的 MAC层实体和 PHY实体;
若切换后所述用户设备连接的基站与切换前所述用户设备连接的基站相同, 用户设备 根据所述用户面切换消息中所述用户设备在接纳用户面承载的小区的配置信息, 将需要切 换的用户面承载复用到对应的基站的 MAC层实体和 PHY实体。
6、 如权利要求 5 所述的方法, 其特征在于, 所述用户设备将需要进行切换的用户面 的承载复用到与接纳用户面承载的小区对应的 MAC层实体和 PHY实体上之后, 还包括: 所述用户设备在收到宏基站对应的配置信息后, 对宏基站对应的 MAC层实体和 PHY 实体进行重配置, 并将保留在宏基站的用户面的承载复用到重配置后的 MAC 层实体和 PHY实体上。
7、 如权利要求 2~4任一所述的方法, 其特征在于, 所述用户设备将用户面的部分或 全部承载切换到至少一个基站上之后, 还包括:
所述用户设备向所述宏基站返回用户面切换完成消息。
8、 一种进行切换的方法, 其特征在于, 该方法包括:
宏基站确定用户设备需要进行切换;
所述宏基站向所述用户设备发送用于进行用户面切换的命令, 用于通知所述用户设备 将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
9、 如权利要求 8 所述的方法, 其特征在于, 所述用于进行用户面切换的命令是用户 面切换消息。
10、 如权利要求 9所述的方法, 其特征在于, 所述宏基站向所述用户设备发送用户面 切换消息之前, 还包括:
所述宏基站在所述用户面切换消息中增加用于指示进行用户面切换的信息。
11、 如权利要求 9所述的方法, 其特征在于, 进行用户面切换是将用户面的部分或全 部承载与控制面分离;
所述宏基站向所述用户设备发送用户面切换消息之前, 还包括:
所述宏基站向需要接纳用户面的承载的基站发送包含所述用户设备需要进行切换的 演进接入无线承载 E-RAB的承载信息的用户面切换请求消息;
所述宏基站根据收到的来自所述基站的用户面切换请求响应消息, 生成用户面切换消 息。
12、如权利要求 11所述的方法, 其特征在于, 所述宏基站向所述用户设备发送用于进 行用户面切换的命令, 用于通知所述用户设备将控制面保持在宏基站, 并将用户面的部分 或全部承载切换到至少一个基站上之后 , 还包括:
所述宏基站在收到来自所述用户设备的用户面切换完成消息后向移动性管理实体 MME发送路径转换请求;
所述宏基站在接收到来自 MME的路径转换请求响应后, 向所述基站转发路径转换请 求响应;
所述宏基站在收到来自所述基站的释放通知后, 释放切换的用户面的资源。
13、如权利要求 11所述的方法, 其特征在于, 所述用户面切换请求响应消息中包括下 列部分或全部信息:
载的标识 ID;
接纳用户面的承载的小区的传输层地址;
接纳用户面的承载的小区接纳的 E-RAB对应的下行 S1-U承载的通用分组无线业务隧 道协议 GTP隧道的隧道端点标识 TEID。
14、 如权利要求 9所述的方法, 其特征在于, 进行用户面切换是将用户面的部分或全 部承载与控制面聚合;
所述宏基站向所述用户设备发送用户面切换消息之前, 还包括:
所述宏基站在成功接纳所述用户设备的用户面后通知特定基站中止被切换的用户面 的数据传输;
其中, 所述特定基站是切换后用户设备的用户面承载减少的基站。
15、 如权利要求 14 所述的方法, 其特征在于, 所述宏基站向所述用户设备发送用于 进行用户面切换的命令之后 , 还包括:
所述宏基站在收到来自所述用户设备的用户面切换完成消息后向 MME发送路径转换 请求;
所述宏基站在接收到来自 MME的路径转换请求响应后, 向切换后未保留用户设备的 全部用户面承载的特定基站发送用户设备上下文释放请求, 以及向切换后保留用户设备的 部分用户面承载的特定基站发送资源释放请求。
16、 如权利要求 14 所述的方法, 其特征在于, 所述用户面切换消息中包括下列部分 或全部信息:
所述用户设备在宏基站的配置信息;
需要进行用户面切换的承载信息;
需要释放的用户面承载的信息;
需要删除的 PHY实体和 MAC层实体的信息。
17、 如权利要求 9所述的方法, 其特征在于, 进行用户面切换是将用户面的部分或全 部承载进行本地基站间转移;
所述宏基站向所述用户设备发送用户面切换消息之前, 还包括:
所述宏基站向需要接纳用户面的承载的基站发送包含所述用户设备需要进行切换的 E-RAB的承载信息的用户面切换请求消息,根据收到的来自所述基站的用户面切换请求响 应消息, 生成用户面切换消息;
所述宏基站在本地基站成功接纳所述用户设备的用户面后通知特定基站中止被切换 的用户面的数据传输, 其中所述特定基站是切换后用户设备的用户面承载减少的基站。
18、 如权利要求 17 所述的方法, 其特征在于, 所述宏基站向所述用户设备发送用于 进行用户面切换的命令之后 , 还包括:
所述宏基站在收到来自所述用户设备的用户面切换完成消息后向 MME发送路径转换 请求;
所述宏基站在接收到来自 MME的路径转换请求响应后, 向接纳用户面承载的基站转 发路径转换请求响应, 向切换后未保留用户设备的全部用户面承载的特定基站发送用户设 备上下文释放请求, 以及向切换后保留用户设备的部分用户面承载的特定基站发送资源释 放请求。
19、 如权利要求 17 所述的方法, 其特征在于, 所述用户面切换请求响应消息中包括 下列部分或全部信息:
载的标识 ID;
接纳用户面的承载的小区的传输层地址;
接纳用户面的承载的小区接纳的 E-RAB对应的下行 S1-U承载的通用分组无线业务隧 道协议 GTP隧道的隧道端点标识 TEID;
所述用户面切换消息中包括下列部分或全部信息:
所述用户设备在宏基站的配置信息;
需要进行用户面切换的承载信息;
需要释放的用户面承载的信息;
需要删除的 PHY实体和 MAC层实体的信息。
20、 如权利要求 12、 15或 18所述的方法, 其特征在于, 所述路径转换请求包括接纳 用户面的承载的小区的传输层地址和接纳用户面的承载的小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID。
21、 一种进行切换的方法, 其特征在于, 该方法包括:
本地基站接收来自宏基站的针对用户设备的用户面切换请求消息;
所述本地基站接纳用户面的部分或全部承载。
22、 如权利要求 21 所述的方法, 其特征在于, 所述用户面切换请求消息包括所述用 户设备需要进行切换的演进接入无线承载 E-RAB的承载信息;
所述本地基站接纳用户面的部分或全部承载, 包括:
所述本地基站根据所述用户设备需要进行切换的 E-RAB 的承载信息, 确定接纳的 E-RAB, 并向所述宏基站返回包含允许接纳的 E-RAB承载信息的用户面切换请求响应消 息。
23、 如权利要求 22 所述的方法, 其特征在于, 所述用户面切换请求响应消息包括下 列部分或全部信息: 载的标识 ID;
接纳用户面的承载的小区接纳的 E-RAB承载对应的上行前转承载通用分组无线业务 隧道协议 GTP隧道的隧道端点标识 TEID和传输层地址;
接纳用户面的承载的小区接纳的 E-RAB承载对应的下行前转承载 GTP隧道的 TEID 和传输层地址;
接纳用户面的 载的小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID和 传输层地址。
24、 如权利要求 21 所述的方法, 其特征在于, 所述本地基站接纳用户面的部分或全 部承载之后, 还包括:
所述本地基站在收到来自所述宏基站的路径转换请求响应后, 通知所述宏基站释放切 换的用户面的承载资源。
25、 如权利要求 21 所述的方法, 其特征在于, 所述本地基站接纳用户面的部分或全 部承载之后, 还包括:
所述本地基站在收到来自所述宏基站中止用户面数据传输的通知后, 进行数据前转过 程。
26、 如权利要求 25所述的方法, 其特征在于, 所述本地基站进行数据前转过程之后, 还包括:
所述本地基站在收到来自所述宏基站的用户设备上下文释放请求后, 释放用户设备的 所有用户面的承载资源。
27、 一种进行切换的用户设备, 其特征在于, 该用户设备包括:
第一接收模块, 用于接收来自宏基站的用于进行用户面切换的命令;
第一处理模块, 用于将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至 少一个基站上。
28、 如权利要求 27 所述的用户设备, 其特征在于, 所述用于进行用户面切换的命令 是用户面切换消息。
29、 如权利要求 28 所述的用户设备, 其特征在于, 进行用户面切换是将用户面的部 分或全部承载与控制面分离或将用户面的部分或全部承载进行本地基站间的转移;
所述第一处理模块具体用于:
在与切换前和切换后都连接的基站保持同步的同时与切换后新连接的基站建立同步, 并根据收到的所述用户面切换消息中的配置信息, 对用户面的承载进行配置。
30、 如权利要求 28 所述的用户设备, 其特征在于, 进行用户面切换是将用户面的部 分或全部承载与控制面聚合;
所述第一处理模块具体用于: 根据收到的所述用户面切换消息中的配置信息, 对用户面的承载进行配置。
31、如权利要求 29或 30所述的用户设备, 其特征在于, 所述第一处理模块具体用于: 若切换后所述用户设备连接的基站是切换前所述用户设备连接的部分基站, 根据所述 用户面切换消息中所述用户设备在切换后的基站的配置信息, 删除切换后未连接的基站对 应的媒体接入控制 MAC层实体和物理层 PHY实体;
若切换前所述用户设备连接的基站是切换后所述用户设备连接的部分基站, 根据所述 用户面切换消息中所述用户设备在切换后的基站的配置信息, 生成与切换前未连接的基站 对应的 MAC层实体和 PHY实体;
若切换后所述用户设备连接的基站与切换前所述用户设备连接的基站部分相同, 根据 所述用户面切换消息中所述用户设备在接纳用户面承载的小区的配置信息, 删除切换后未 连接的基站对应的 MAC层实体和 PHY实体, 且生成与切换前未连接的基站对应的 MAC 层实体和 PHY实体;
若切换后所述用户设备连接的基站与切换前所述用户设备连接的基站相同, 根据所述 用户面切换消息中所述用户设备在接纳用户面承载的小区的配置信息, 将需要切换的用户 面承载复用到对应的基站的 MAC层实体和 PHY实体。
32、 如权利要求 31所述的用户设备, 其特征在于, 所述第一处理模块还用于: 将需要进行切换的用户面的承载复用到与接纳用户面承载的小区对应的 MAC层实体 和 PHY实体上之后, 在收到宏基站对应的配置信息后, 对宏基站对应的 MAC层实体和 PHY实体进行重配置, 并将保留在宏基站的用户面的承载复用到重配置后的 MAC层实体 和 PHY实体上。
33、如权利要求 28 30任一所述的用户设备, 其特征在于, 所述第一处理模块还用于: 将用户面的部分或全部承载切换到至少一个基站上之后, 向所述宏基站返回用户面切 换完成消息。
34、 一种进行切换的宏基站, 其特征在于, 该宏基站包括:
确定模块, 用于确定用户设备需要进行切换;
第二处理模块, 用于向所述用户设备发送用于进行用户面切换的命令, 用于通知所述 用户设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上。
35、 如权利要求 34 所述的宏基站, 其特征在于, 所述用于进行用户面切换的命令是 用户面切换消息。
36、 如权利要求 35所述的宏基站, 其特征在于, 所述第二处理模块还用于: 向所述用户设备发送用户面切换消息之前, 在所述用户面切换消息中增加用于指示进 行用户面切换的信息。
37、 如权利要求 35 所述的宏基站, 其特征在于, 进行切换是将用户面的部分或全部 承载与控制面分离;
所述第二处理模块还用于:
向所述用户设备发送用户面切换消息之前, 向需要接纳用户面的承载的基站发送包含 所述用户设备需要进行切换的演进接入无线承载 E-RAB 的承载信息的用户面切换请求消 息; 根据收到的来自所述基站的用户面切换请求响应消息, 生成用户面切换消息。
38、 如权利要求 37所述的宏基站, 其特征在于, 所述第二处理模块还用于: 通知所述用户设备将控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少 一个基站上之后, 在收到来自所述用户设备的用户面切换完成消息后向移动性管理实体 MME发送路径转换请求; 在接收到来自 MME的路径转换请求响应后, 向所述基站转发 路径转换请求响应; 在收到来自所述基站的释放通知后, 释放切换的用户面的资源。
39、 如权利要求 37 所述的宏基站, 其特征在于, 所述用户面切换请求响应消息中包 括下列部分或全部信息:
载的标识 ID;
接纳用户面的承载的小区的传输层地址;
接纳用户面的承载的小区接纳的 E-RAB对应的下行 S1-U承载的通用分组无线业务隧 道协议 GTP隧道的隧道端点标识 TEID。
40、 如权利要求 35 所述的宏基站, 其特征在于, 进行用户面切换是将用户面的部分 或全部承载与控制面聚合;
所述第二处理模块还用于:
向所述用户设备发送用户面切换消息之前, 在成功接纳所述用户设备的用户面后通知 特定基站中止被切换的用户面的数据传输;
其中, 所述特定基站是切换后用户设备的用户面承载减少的基站。
41、 如权利要求 40所述的宏基站, 其特征在于, 所述第二处理模块还用于: 向所述用户设备发送用于进行用户面切换的命令之后 , 在收到来自所述用户设备的用 户面切换完成消息后向 MME发送路径转换请求; 在接收到来自 MME的路径转换请求响 应后, 向切换后未保留用户设备的全部用户面承载的特定基站发送用户设备上下文释放请 求, 以及向切换后保留用户设备的部分用户面承载的特定基站发送资源释放请求。
42、 如权利要求 40 所述的宏基站, 其特征在于, 所述用户面切换消息中包括下列部 分或全部信息:
所述用户设备在宏基站的配置信息;
需要进行用户面切换的承载信息;
需要释放的用户面承载的信息;
需要删除的 PHY实体和 MAC层实体的信息。
43、 如权利要求 35 所述的宏基站, 其特征在于, 进行用户面切换是将用户面的部分 或全部承载进行本地基站间转移;
所述第二处理模块还用于:
向所述用户设备发送用户面切换消息之前, 向需要接纳用户面的承载的基站发送包含 所述用户设备需要进行切换的 E-RAB 的承载信息的用户面切换请求消息, 根据收到的来 自所述基站的用户面切换请求响应消息, 生成用户面切换消息; 在本地基站成功接纳所述 用户设备的用户面后通知特定基站中止被切换的用户面的数据传输, 其中所述特定基站是 切换后用户设备的用户面承载减少的基站。
44、 如权利要求 43所述的宏基站, 其特征在于, 所述第二处理模块还用于: 向所述用户设备发送用于进行用户面切换的命令之后, 在收到来自所述用户设备的用 户面切换完成消息后向 MME发送路径转换请求; 在接收到来自 MME的路径转换请求响 应后, 向接纳用户面承载的基站转发路径转换请求响应, 向切换后未保留用户设备的全部 用户面承载的特定基站发送用户设备上下文释放请求, 以及向切换后保留用户设备的部分 用户面承载的特定基站发送资源释放请求。
45、 如权利要求 43 所述的宏基站, 其特征在于, 所述用户面切换请求响应消息中包 括下列部分或全部信息:
载的标识 ID;
接纳用户面的承载的小区的传输层地址;
接纳用户面的承载的小区接纳的 E-RAB对应的下行 S1-U承载的通用分组无线业务隧 道协议 GTP隧道的隧道端点标识 TEID;
所述用户面切换消息中包括下列部分或全部信息:
所述用户设备在宏基站的配置信息;
需要进行用户面切换的承载信息;
需要释放的用户面承载的信息;
需要删除的 PHY实体和 MAC层实体的信息。
46、 如权利要求 38、 41或 44所述的宏基站, 其特征在于, 所述路径转换请求包括接 纳用户面的承载的小区的传输层地址和接纳用户面的承载的小区接纳的 E-RAB对应的下 行 S1-U承载的 GTP隧道的 TEID。
47、 一种进行切换的本地基站, 其特征在于, 该本地基站包括:
第二接收模块, 用于接收来自宏基站的针对用户设备的用户面切换请求消息; 第三处理模块, 用于接纳用户面的部分或全部承载。
48、 如权利要求 47 所述的本地基站, 其特征在于, 所述用户面切换请求消息包括所 述用户设备需要进行切换的演进接入无线承载 E-RAB的承载信息; 所述第三处理模块具体用于:
根据所述用户设备需要进行切换的 E-RAB的承载信息, 确定接纳的 E-RAB, 并向所 述宏基站返回包含允许接纳的 E-RAB承载信息的用户面切换请求响应消息。
49、 如权利要求 48 所述的本地基站, 其特征在于, 所述用户面切换请求响应消息包 括下列部分或全部信息:
载的标识 ID;
接纳用户面的承载的小区接纳的 E-RAB承载对应的上行前转承载通用分组无线业务 隧道协议 GTP隧道的隧道端点标识 TEID和传输层地址;
接纳用户面的承载的小区接纳的 E-RAB承载对应的下行前转承载 GTP隧道的 TEID 和传输层地址;
接纳用户面的 载的小区接纳的 E-RAB对应的下行 Sl-U ^ 载的 GTP隧道的 TEID和 传输层地址。
50、 如权利要求 47所述的本地基站, 其特征在于, 所述第三处理模块还用于: 接纳用户面的部分或全部承载之后 , 在收到来自所述宏基站的路径转换请求响应后, 通知所述宏基站释放切换的用户面的承载资源。
51、 如权利要求 47所述的本地基站, 其特征在于, 所述第三处理模块还用于: 基站接纳用户面的部分或全部承载之后 , 在收到来自所述宏基站中止用户面数据传输 的通知后, 进行数据前转过程。
52、 如权利要求 51所述的本地基站, 其特征在于, 所述第三处理模块还用于: 进行数据前转过程之后, 在收到来自所述宏基站的用户设备上下文释放请求后, 释放 用户设备的所有用户面的承载资源。
53、 一种进行切换的系统, 其特征在于, 该系统包括:
宏基站, 用于向用户设备发送用于进行用户面切换的命令, 用于通知所述用户设备将 控制面保持在宏基站, 并将用户面的部分或全部承载切换到至少一个基站上;
用户设备, 用于接收来自宏基站的用于进行用户面切换的命令, 将控制面保持在宏基 站, 并将用户面的部分或全部承载切换到至少一个基站上。
54、 如权利要求 53所述的系统, 其特征在于, 所述系统还包括本地基站; 宏基站还用于: 向需要接纳用户面的承载的基站发送包含所述用户设备需要进行切换 的演进接入无线承载 E-RAB 的承载信息的用户面切换请求消息, 根据收到的来自所述基 站的用户面切换请求响应消息, 生成用户面切换消息;
本地基站, 用于接收来自宏基站的针对用户设备的用户面切换请求消息, 接纳用户面 的部分或全部承载。
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