WO2012159529A1 - 切换方法和基站 - Google Patents

切换方法和基站 Download PDF

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Publication number
WO2012159529A1
WO2012159529A1 PCT/CN2012/075269 CN2012075269W WO2012159529A1 WO 2012159529 A1 WO2012159529 A1 WO 2012159529A1 CN 2012075269 W CN2012075269 W CN 2012075269W WO 2012159529 A1 WO2012159529 A1 WO 2012159529A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
target base
handover
target
context information
Prior art date
Application number
PCT/CN2012/075269
Other languages
English (en)
French (fr)
Inventor
张亮亮
常俊仁
李亚娟
张永平
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP12790288.0A priority Critical patent/EP2704485B1/en
Publication of WO2012159529A1 publication Critical patent/WO2012159529A1/zh
Priority to US14/088,580 priority patent/US9402208B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0058Transmission of hand-off measurement information, e.g. measurement reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0069Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/26Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H04W36/28Reselection being triggered by specific parameters by agreed or negotiated communication parameters involving a plurality of connections, e.g. multi-call or multi-bearer connections

Definitions

  • the present invention relates to the field of wireless communications and, more particularly, to handover methods and base stations in the field of wireless communications. Background technique
  • the 3GPP LTE-A system has now agreed to use carrier aggregation technology as its method of extending system bandwidth to support peak data rates up to 1G.
  • carrier aggregation is to aggregate multiple component carriers into one carrier of larger bandwidth to support high speed data rates.
  • a User Equipment can aggregate carriers from two different sites to implement carrier aggregation between different sites. For example, when the UE is at the cell edge, the UE may aggregate carriers from the low frequency band of the macro base station and carriers of the high frequency band from the relay station (RN).
  • RN relay station
  • the UE and the wireless network can maintain one Radio Resource Control (RRC), and can also maintain multiple radio resource connections.
  • RRC Radio Resource Control
  • the UE receives the service from the macro base station and the RN, and establishes a data connection with both the macro base station and the RN, but the UE may maintain only one RRC connection with one of the macro base station and the RN, or may simultaneously cooperate with the macro base station and the RN. Both maintain two RRC connections.
  • RRC Radio Resource Control
  • the embodiment of the present invention provides a handover method and a base station, which can solve the problem that the UE performs handover using the carrier aggregation technology, so that the UE that is using the carrier aggregation technology or the UE that uses the carrier aggregation technology after the handover can provide fast handover.
  • the UE pre-switching service can be quickly restored for such a UE, thereby improving the communication experience of the user.
  • the embodiment of the present invention provides a handover method, including: acquiring, when a handover of a user equipment UE is required, acquiring bearer context information of the UE on a first base station, where the first base station is the UE
  • the source base station sends a handover request to the target base station, where the handover request carries the bearer context information, where the bearer context information is used by the target base station to determine whether to accept the UE handover; after receiving the handover response of the agreed handover returned by the target base station And transmitting a handover command to the UE to instruct the UE to handover to the target base station.
  • an embodiment of the present invention provides a handover method, including: when a user equipment is required
  • the embodiment of the present invention provides a handover method, including: when a user equipment is needed And transmitting, by the UE, a handover request to the first base station serving the UE, to enable the first base station to add bearer context information of the UE on the first base station to the handover request, and Forwarding to the target base station, the bearer context information is used by the target base station to determine whether to accept the UE handover; after receiving the handover response of the consent handover returned by the target base station sent by the first base station, to the UE A handover command is sent to instruct the UE to handover to the target base station.
  • the embodiment of the present invention provides a handover method, including: receiving, by a first base station, a handover request sent by a user equipment UE that needs to be handed over; and adding, by the UE, bearer context information on the second base station to the received
  • the handover request is sent to the target base station, where the bearer context information is used by the target base station to determine whether to accept the UE handover; and the first base station sends a handover response of the consent handover returned by the target base station to indicate
  • the first base station sends a handover command to the UE according to the handover response, where the handover command is used to instruct the UE to switch to the target base station.
  • the embodiment of the present invention provides a handover method, including: when a handover of a user equipment UE is required, sending a handover request to a first target base station and a second target base station, where the handover request carries the UE Carrying the context information, the base station identifier of the first target base station, and the base station identifier of the second target base station, so that the first target base station negotiates with the second target base station based on the base station identifier of the second target base station Determining, by the first target base station and the second target base station, bearers related to the bearer context information, where the bearer context information is used by the first target base station and the second target base station to determine whether Receiving a UE handover; after receiving the handover response of the first target base station and the second target base station to agree to handover, sending a handover command to the UE to instruct the UE to switch to the first target base station and The second target base station.
  • the embodiment of the present invention provides a handover method, including: receiving, by a source base station, a handover request sent by a user equipment UE that needs to be handed over, where the handover request carries bearer context information of the UE and a first target base station Determining, by the base station identifier of the first target base station, the bearer related to the bearer context information that is required to be undertaken by the first target base station according to the base station identifier; When the negotiation is successful, a handover response agreeing to the handover is returned to the source base station.
  • the embodiment of the present invention provides a handover method, including: when a user equipment UE establishes an RRC connection with a first base station and a second base station, when the UE needs to be from the second base station Transmitting to the target base station, transmitting, to the target base station, a handover request carrying the base station identifier of the first base station, so that the target base station interacts with the first base station based on the base station identifier of the first base station; After the handover response of the agreed handover returned by the target base station, a handover command is sent to the UE to instruct the UE to handover to the target base station.
  • the embodiment of the present invention provides a handover method, including: when a user equipment UE establishes an RRC connection with a first base station and a second base station, when the UE needs to be from the second base station Receiving a handover request sent by the second base station to carry the base station identifier of the first base station when switching to the target base station; interacting with the first base station based on the base station identifier; determining to agree to switch based on the handover request And completing, by the second base station, the handover of the UE.
  • the embodiment of the present invention provides a base station, including: an acquiring module, configured to acquire bearer context information of the UE on a first base station when the user equipment UE needs to be handed over, the first base station a source base station of the UE, a first sending module, configured to send a handover request to the target base station, where the handover request carries the bearer context information, where the bearer context information is used by the target base station to determine whether to accept the UE handover; And a sending module, configured to send a handover command to the UE after receiving the handover response of the agreed handover returned by the target base station, to instruct the UE to switch to the target base station.
  • the embodiment of the present invention provides a base station, including: a first sending module, configured to send a handover request to a target base station when the user equipment UE needs to be switched; and a second sending module, configured to receive the After the handover response of the target handover returned by the target base station, the first base station serving the UE is configured to send a handover indication to indicate that the first base station performs data forwarding to the target base station, and the third sending module is configured to: Transmitting a handover command to the UE to instruct the UE to handover to the target base station.
  • an embodiment of the present invention provides a base station, including: a sending module, configured to: when a user equipment UE needs to be handed over, send a handover request to a first base station that provides a service for the UE, so that the The first base station adds the bearer context information of the UE on the first base station to the handover request and forwards the information to the target base station, where the bearer context information is used by the target base station to determine whether to accept the UE handover;
  • the receiving module is configured to send a handover command to the UE to instruct the UE to switch to the target base station, after receiving the handover response of the consent handover returned by the target base station by the first base station.
  • an embodiment of the present invention provides a base station, including: a receiving module, configured to receive a handover request sent by a first base station to a user equipment UE that needs to be handed over; and an adding module, configured to: use the UE in the base station The bearer context information is added to the received handover request, and the handover request is sent to the target base station, where the bearer context information is used by the target base station to determine whether to accept the UE handover; and the sending module is configured to send the first Sending, by the base station, a handover response of the consent handover returned by the target base station, to instruct the first base station to send a handover command to the UE according to the handover response, where the handover command is used to indicate that the UE switches to the target base station .
  • the embodiment of the present invention provides a base station, including: a first sending module, configured to send a handover request to a first target base station and a second target base station when the user equipment UE needs to be handed over, the switching Requesting to carry the bearer context information of the UE, the base station identifier of the first target base station, and the base station identifier of the second target base station, so that the first target base station is based on the base station identifier and location of the second target base station Determining, by the second target base station, a bearer related to the bearer context information that the first target base station and the second target base station need to bear, the bearer context information being used by the first target base station and the The second target base station determines whether to accept the UE handover; the second sending module is configured to send a handover command to the UE after receiving the handover response of the first target base station and the second target base station to agree to the handover Instructing the UE to handover to the first target base station and the second target
  • an embodiment of the present invention provides a base station, including: a receiving module, configured to receive a source And the handover request carries the bearer context information of the UE and the base station identifier of the first target base station, where the handover request is sent by the base station, where the handover request carries the base station identifier of the first target base station; And determining, by the first target base station, the bearer that is required to bear the bearer context information, and the sending module, configured to: when the negotiation succeeds, return a handover response that agrees to the handover to the source base station.
  • the embodiment of the present invention provides a base station, including: a first sending module, configured to: when the user equipment UE establishes an RRC connection with the first base station and the second base station, respectively, when the UE needs to be Transmitting, by the second base station to the target base station, a handover request carrying the base station identifier of the first base station to the target base station, so that the target base station is based on the base station identifier of the first base station and the
  • the second sending module is configured to send a handover command to the UE to instruct the UE to switch to the target base station, after receiving the handover response of the agreed handover returned by the target base station.
  • the embodiment of the present invention provides a base station, including: a receiving module, configured to: when the user equipment UE establishes an RRC connection with the first base station and the second base station, respectively, when the UE needs to be Receiving, by the second base station, the handover request of the base station identifier of the first base station that is sent by the second base station; the interaction module, configured to interact with the first base station according to the identifier of the base station; And a switching module, configured to complete handover of the UE with the second base station when determining to agree to handover based on the handover request.
  • a receiving module configured to: when the user equipment UE establishes an RRC connection with the first base station and the second base station, respectively, when the UE needs to be Receiving, by the second base station, the handover request of the base station identifier of the first base station that is sent by the second base station
  • the interaction module configured to interact with the first base station according to the identifier of the base station
  • a switching module configured to
  • the second base station performing the handover acquires the bearer context information and/or direction of the UE on the first base station. It is not known that the first base station that performs the handover of the UE sends a handover indication to enable the first base station to perform data forwarding.
  • the UE can be handed over to the target base station in different scenarios and the current service of the UE can be quickly restored, so that the UE under multiple carriers can obtain the UE.
  • the fast switching process makes it possible to increase the communication experience of the user during the handover process.
  • the target base station can determine the allocation of the UE bearer by negotiating with the other party based on the identifier of the base station, so that the UE can smoothly switch to the two target base stations to implement carrier aggregation after the handover.
  • the current service of the UE can be quickly restored, so that the UE can perform fast handover even if the UE needs to use carrier aggregation, thereby enhancing the communication experience of the user.
  • the target base station can quickly discover and interact with the source base station by carrying the base station identifier of the source base station that maintains the RRC connection unchanged in the handover request. To achieve better cooperation between the two to serve the UE, so that the impact of handover on the user's communication experience can be reduced.
  • FIG. 1 is a flow chart of a handover method in accordance with an embodiment of the present invention.
  • FIG. 2 is a flow chart of another switching method in accordance with an embodiment of the present invention.
  • FIG. 3 is a flow chart of still another switching method in accordance with an embodiment of the present invention.
  • FIG. 4 is a message interaction diagram of a UE switching to a third base station by a second base station if the second base station needs to access the core network via the first base station.
  • FIG. 5 is a case where the second base station needs to access the core network via the first base station, and the first base station will
  • the UE switches to a message interaction diagram of the third base station and the fourth base station.
  • Figure 6 is a message interaction diagram of handover of a UE to a third base station by a second base station in the case where the first base station and the second base station are independent of each other.
  • FIG. 7 is a message interaction diagram of handover of a UE by a second base station to a third base station and a fourth base station in a case where the first base station and the second base station are independent of each other.
  • FIG. 8 is a flow chart of still another switching method according to an embodiment of the present invention.
  • FIG. 9 is a flow chart of still another switching method in accordance with an embodiment of the present invention.
  • FIG. 10 is a message interaction diagram of a UE switching to a third base station by a second base station if the second base station needs to access the core network via the first base station.
  • 11 is a second base station if the second base station needs to access the core network via the first base station
  • the UE switches to a message interaction diagram of the third base station and the fourth base station.
  • FIG. 12 is a flow chart of still another switching method according to an embodiment of the present invention.
  • FIG. 13 is a flow chart of still another switching method according to an embodiment of the present invention.
  • 15 is a flow chart of still another switching method in accordance with an embodiment of the present invention.
  • 16 is a message interaction diagram of the RRC connection of the first base station to the UE by the second base station when the first base station and the second base station both establish an RRC connection with the UE, and the second base station switches the UE to the target base station.
  • FIG. 17 is a structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 18 is a structural block diagram of another base station according to an embodiment of the present invention.
  • FIG. 19 is a structural block diagram of still another base station according to an embodiment of the present invention.
  • FIG. 20 is a structural block diagram of still another base station according to an embodiment of the present invention.
  • 21 is a structural block diagram of still another base station according to an embodiment of the present invention.
  • FIG. 22 is a structural block diagram of still another base station according to an embodiment of the present invention.
  • FIG. 23 is a structural block diagram of still another base station according to an embodiment of the present invention.
  • FIG. 24 is a structural block diagram of still another base station according to an embodiment of the present invention.
  • FIG. 25 is a structural block diagram of still another base station according to an embodiment of the present invention.
  • FIG. 26 is a structural block diagram of still another base station according to an embodiment of the present invention. detailed description
  • the method 100 includes: in S110, when handover of a UE is required, acquiring bearer context information of the UE on the first base station, where the first base station is a source base station of the UE; and in S120, to the target base station Sending a handover request, the handover request carries bearer context information, and the bearer context information is used by the target base station to determine whether to accept the UE handover.
  • S130 after receiving the handover response of the consent handover returned by the target base station, sending a handover command to the UE to indicate the UE handover. Go to the target base station.
  • Method 100 can be performed by a second base station.
  • the first base station and the second base station are source base stations that provide services for the UE before the handover, and the RRC connection is established between the UE and the second base station, and the UE and the first base station may or may not have an RRC connection, and the second base station Perform handover of the UE. Since the second base station does not know the bearer context information of the UE on the first base station, it needs to acquire the context information, and then sends a handover request to the target base station. In this way, the target base station can know all bearer context information of the UE on the first base station and the second base station, thereby determining whether the UE handover can be accepted based on the bearer context information or the like.
  • a handover response agreeing to the handover is returned to the second base station, so that the UE can handover to the target base station.
  • the target base station may provide services for the UE's bearer by itself, or may provide services for a part of the UE's bearer, and allocate another part of the bearer to, for example, its own RN to provide the corresponding service.
  • the bearer context information refers to the terminal bearer list, including the bearer identifier (E-RAB ID), the QoS parameter corresponding to the bearer (E-RAB Level QoS Parameters), and the uplink or downlink GTP tunnel endpoint address (UL/DL GTP Tunnel Endpoint). and many more.
  • the first base station may be received to update the UE on the first base station.
  • the first base station may actively send the updated bearer context information to the second base station.
  • the first base station may periodically update the bearer context information of the UE, or trigger the update of the bearer context information of the UE by an event.
  • the bearer context information of the UE on the first base station may be requested from the first base station, and the bearer context information returned by the first base station is received.
  • the second base station may request bearer context information of the UE on the first base station, thereby acquiring the bearer context information.
  • the bearer context information triggered by the first base station to be sent based on the measurement report result may be received.
  • the first base station may also receive the measurement report sent by the UE. According to the result in the measurement report, the first base station may actively send the bearer context information of the UE on the first base station to the second base station. For example, when the specific parameter in the measurement report is lower than the threshold, the first base station transmits bearer context information to the second base station.
  • the second base station can know all bearer context information of the UE on the second base station and the first base station by acquiring bearer context information of the UE from the first base station.
  • the handover request since the handover of the UE is performed by the second base station, the handover request needs to carry the bearer context information of the UE on the second base station as in the related art. In addition, the handover request also needs to carry bearer context information of the UE acquired by the second base station in the S110 on the first base station. In this way, the target base station can obtain all the bearer context information of the UE, and use all the bearer context information of the UE carried in the handover request in determining whether to accept the handover of the UE.
  • the target base station accepts the UE handover, returning a handover response agreeing to the handover to the second base station.
  • the second base station commands the UE to perform handover based on the response.
  • the second base station may obtain the target base station based on the UE by acquiring the bearer context information of the UE on the first base station. All bearers on the first base station and the second base station determine whether to agree to the handover, so that if the target base station agrees to the handover, the UE can be handed over from the first base station and the second base station to the target base station, so that the UE can be used more In the case of a carrier, the handover of the UE is quickly implemented, and the current service of the UE is quickly restored, so that the communication experience of the user during the handover process can be increased.
  • S210 to S230 in method 200 are substantially the same as S110 to S130 in method 100.
  • a handover indication is sent to the first base station to instruct the first base station to perform data forwarding to the target base station.
  • the second base station that performs the handover may send a handover indication to the first base station, and use the handover indication to instruct the first base station to forward the data on the UE bearer to the target base station. In this way, after the UE switches to the target base station, the current service can be quickly restored for the UE.
  • the transmission switching indication in S240 is performed after the transmission switching command in S230, the transmission switching indication in S240 may be performed before the transmission switching command in S230, or simultaneously, the execution order of the present invention There is no limit to the scope of protection.
  • the handover request may carry the base station identifier of the first base station to indicate to the target base station that the first base station establishes an RRC connection with the UE.
  • the source base station performing the UE handover is the second base station, there is an RRC connection between the second base station and the UE. If the first base station also has an RRC connection with the UE, the base station identifier of the first base station is carried in the handover request. In this way, the target base station can be notified of the base station identifier of the first base station, so that the target base station knows that the UE is not only using the carrier aggregation technology but also has multiple RRC connections, and can interact with the first base station by using the base station identifier of the first base station when needed. .
  • the target base station after the UE switches to the target base station, the target base station indicates, according to the base station identifier of the first base station, that the first base station successfully switches the terminal, and releases the UE related resources.
  • the target base station Since the target base station knows the existence of the first base station through the handover request, the UE switches to the target If the base station disconnects the connection with the first base station, the target base station may notify the first base station terminal that the handover is successful based on the base station identifier of the first base station, and release the UE related resources, that is, release the UE related to the UE according to the context information of the UE. resource of.
  • the context information of the UE includes bearer information, or security information of the terminal (such as UE Security Capabilities, Security Key), or the terminal may aggregate with the bit UE Aggregate Maximum Bit Rate, or the terminal is at X2.
  • the associated ID on the interface eg, Old eNB UE X2AP ID
  • the ID of the terminal associated with the SI interface eg, MME UE S1AP ID, eNB UE S1AP ID
  • the UE instructs the first base station to successfully switch the terminal, and releases the UE related resources.
  • the UE may notify the source base station before the handover to release the UE's own context information, that is, release the resources (wireless or control plane resources) related to the UE according to the context information of the UE.
  • the target base station in S220 may be a target base station or multiple target base stations.
  • the target base station may include a first target base station and a second target base station.
  • the handover request in S220 carries the base station identifier of the first target base station and the base station identifier of the second target base station.
  • the first target base station determines, according to the base station identifier of the second target base station, the second target base station to determine the UE to be assumed by the first target base station and the second target base station. Hosted.
  • the second base station can respectively send a handover request to the first target base station and the second target base station, and carry the base station identification of both in the handover request.
  • the two target base stations can know each other's existence and know that the UE needs to switch to the first and second target base stations.
  • the first target base station and the second target base station negotiate to determine that the handover is performed. How the bearer of the UE reflected by the bearer context information of the UE carried in the request is allocated between the two. If the bearer of the UE can be accepted by the first target base station and the second target base station, it is possible for the UE to switch to the first target base station and the second target base station. If the two are inconsistent and cannot fully accept the bearer of the UE, the UE cannot switch to the first and second target base stations.
  • the first target base station may determine the primary site in consultation with the second target base station based on the base station identity of the second target base station.
  • the first target base station may determine the primary site based on the order in which the first target base station and the second target base station receive the handover request.
  • the first target base station is a macro base station
  • the second target base station is a relay station
  • the macro base station first receives the handover request, then the macro base station is the primary station.
  • the second target base station transmits the time when the handover request is received to the first target base station, the first target base station compares the time with its own reception time, and determines the target base station that first receives the handover request as the primary station.
  • the first target base station can determine the primary site according to a predetermined configuration.
  • the target base station of a certain type or a certain configuration may always be used as the primary station.
  • the macro base station is used as the primary station.
  • the first target base station can determine the primary site based on the order in which the first target base station and the second target base station establish an RRC connection with the UE.
  • the first target base station may determine the primary site according to the sequence in which the handover request carries the base station identity of the first target base station and the base station identity of the second target base station. For example, if the base station identifier of the first target base station carried in the handover request is located before the base station identifier of the second target base station, it is determined that the first target base station is the primary station.
  • the first target base station may determine the primary site according to the response message returned by the second target base station in response to the request sent by the first target base station to determine the request message of the primary site. For example, the first target base station sends a request message to the second target base station, where the request message carries the base station identifier of the first target base station, so that the proposal wishes to determine itself as the primary station. If the response message returned by the second target base station is the same It is intended that the first target base station is the primary site, otherwise the second target base station is the primary site.
  • the base station identifier of the first base station is carried in the handover request, thereby facilitating the target base station to interact with the base station identifier based on the base station identifier, and notifying the first
  • the base station terminal successfully switches and releases the UE related resources.
  • the bearer management or the primary site can be negotiated by carrying the base station identifiers of the multiple target base stations, so that the switching in the scenario can be smoothly performed.
  • FIG. 3 is a flow diagram of a handover method 300 in accordance with an embodiment of the present invention.
  • the method 300 includes: in S310, when a handover of the UE is required, sending a handover request to the target base station; and in S320, after receiving the handover response of the consent handover returned by the target base station, providing the UE with the handover response
  • the serving first base station sends a handover indication to instruct the first base station to perform data forwarding to the target base station; in S330, a handover command is sent to the UE to instruct the UE to handover to the target base station.
  • method 300 can be performed by a second base station.
  • the second base station and the first base station are the source base stations of the UE, and the second base station performing the UE handover establishes an RRC connection with the UE, and the first base station and the UE may or may not have an RRC connection.
  • the second base station sends a handover indication to the first base station to indicate that the first base station sends the number of UEs to the target base station, so that the current UE can be quickly restored after the handover.
  • Business increase the user's communication experience.
  • the handover request sent by the second base station may carry the base station identifier of the first base station, to indicate to the target base station that the first base station and the UE establish an RRC. connection.
  • the target base station may send a UE context release message to the first base station based on the base station identifier of the first base station, to indicate that the first base station terminal successfully performs handover, and release the UE related resources.
  • the UE may instruct the first base station that the terminal handover is successful, and release the UE related resources.
  • the target base station may include the first target base station and the second target base station.
  • the handover request carries the base station identifier of the first target base station and the base station identifier of the second target base station.
  • the first target base station determines, according to the base station identifier of the second target base station, the second target base station to determine the UE to be assumed by the first target base station and the second target base station. Hosted.
  • the first target base station may determine the primary site by negotiating with the second target base station based on the base station identity of the second target base station. For example, when determining the primary site, the sequence of the handover request may be received according to the first target base station and the second target base station; or may be configured according to a predetermined configuration; or the RRC may be established according to the first target base station and the second target base station. The sequence of the connection may also be performed according to the sequence of the base station identifier of the first target base station and the base station identifier of the second target base station according to the handover request; or the request message of the primary station may be determined according to the request sent by the second target base station in response to the first target base station And the response message returned.
  • the computing personnel in the field can also think of other ways of determining the primary site.
  • the first base station can perform data forwarding by sending a handover indication to the first base station, so that the handover of the UE can be quickly implemented when the multi-carrier is used, and the current service of the UE is quickly restored. , making it possible to increase the user's communication experience during the handover process.
  • the second base station may be an RN, or may be a home base station (Home eNB), a small base station (Pico eNB) or other type of base station in the same state as the RN;
  • the first base station may be a macro base station, such as an eNB. , donor base station DeNB (donor evolved NodeB), and the like. Therefore, the base station in this embodiment is a base station in a broad sense, including a UE. Service access wireless access points, such as donor base stations and relay stations.
  • the second base station is the RN
  • the first base station is the DeNB
  • the third base station is the DeNB. Since the second base station and the first base station are source base stations before handover, they are represented by S-RN and S-DeNB, respectively. Since the third base station is the target base station, it is represented by T-DeNB. In addition, the third base station can also be other types of base stations. Also shown in FIG. 4 is a relay station T-RN under the third base station. Although the UE handover target is the third base station, the third base station may also allocate some of the UE's bearers to the T-RN.
  • the UE communicates using the S-RN and the carrier of the S-DeNB.
  • the S-RN is an Anchor base station.
  • the UE sends a measurement report to the S-RN, where the measurement report carries the measured value of the cell of the UE under the S-RN and/or the S-DeNB.
  • the S-RN makes a handover decision based on the measurement report.
  • the S-RN obtains bearer context information of the UE on the S-DeNB from the S-DeNB. For example, when the S-DeNB updates the bearer context information of the UE, the S-RN is notified, or the S-DeNB notifies the S-RN of the bearer context information of the UE when receiving the S-RN request, or the S-DeNB can also receive the measurement report. The bearer context information of the UE is sent to the S-RN according to the measurement report result.
  • the S-RN carries the bearer context information of the UE on the S-RN and the bearer context information acquired in S430 in the handover request, and sends the information to the T-DeNB (ie, the target base station), and performs handover with the T-DeNB.
  • the T-DeNB ie, the target base station
  • the handover request sent by the S-RN may also carry the base station identifier of the S-DeNB.
  • the S-DeNB Since the handover response received by the S-RN is forwarded by the S-DeNB, the S-DeNB also receives the handover response and forwards the UE data on the S-DeNB to the T-DeNB. If the T-DeNB also wants the fourth base station to also provide data services for the UE (for example, in the case where the third base station is a T-DeNB, the fourth base station is a T-RN), the T-DeNB forwards the data to the fourth base station. .
  • the S-RN when receiving the handover response, the S-RN also forwards the UE data on the S-RN to the third base station. Since the operation of data forwarding is the same as the related art, it will not be described in detail.
  • the UE performs a RACH (Random Access Channel) access procedure to switch to the third base station.
  • RACH Random Access Channel
  • the third base station may indicate that the S-DeNB releases the related resources based on the base station identifier of the S-DeNB.
  • the UE may also actively request the S-DeNB to release its own related resources after switching to the third base station.
  • FIG. 5 is a message interaction diagram of handover of a UE by a first base station to a third base station and a fourth base station in a case where the second base station needs to access the core network via the first base station.
  • the second base station is an S-RN and the first base station is an S-DeNB.
  • the third base station and the fourth base station are both target base stations, and may be any type of base station.
  • the third base station is a T-DeNB and the fourth base station is a T-RN.
  • an RRC connection is established between the UE and the S-DeNB, and there may or may not be an RRC connection with the S-RN, and the UE uses the S-DeNB and the S-RN carrier to communicate, and S - DeNB is an Anchor base station.
  • the UE sends a measurement report to the S-DeNB, where the measurement report carries the measured value of the cell of the UE under the S-RN and/or the S-DeNB.
  • the S-DeNB makes a handover decision based on the measurement report.
  • the S-DeNB Since the S-DeNB knows all the bearer context information of the UE on the S-RN and the S-DeNB, it is not necessary to acquire the bearer context information of the UE on the S-RN as in FIG. 4 .
  • the S-DeNB needs to handover the UE to the T-RN (target relay station) and the T-DeNB. Since the T-RN is a relay station of the T-DeNB, the S-DeNB may only transmit the handover request (the base station identifier carrying the T-RN and the T-DeNB) to the T-DeNB, and then the T carried by the T-DeNB based on the handover request. - The base station identity of the RN, which forwards the handover request to the T-RN. Of course, the S-DeNB may also send a handover request to the T-RN and the T-DeNB, respectively. The base station identifier of the T-RN and the T-DeNB is carried in the handover request, and carries the bearer context information of the UE on the S-DeNB and the S-RN.
  • the T-RN and the T-DeNB can negotiate to determine how to allocate the bearer of the UE, and determine whether to accept the handover of the UE.
  • the T-RN and T-DeNB can also negotiate who is the primary site.
  • the base station identifier of the S-RN may also be carried in the handover request, so that the target base station knows the existence of the S-RN, and may indicate S- after the handover.
  • the RN releases the relevant resources.
  • the primary station in the T-RN and the T-DeNB returns a handover response that agrees to the handover to the S-DeNB, and may carry the UE bearer beared by the T-RN and the T-DeNB in the handover response.
  • the S-DeNB After receiving the handover response, the S-DeNB performs data forwarding to the T-RN and the T-DeNB.
  • the S-DeNB sends a handover indication to the S-RN to instruct the S-RN to perform data forwarding to the T-RN and the T-DeNB, and forward the data on the buffered UE bearer to the target base station, so as to implement the current UE. Rapid recovery of business.
  • the S-DeNB sends a handover command to the UE. This step can also be performed before S550 or concurrently with S550.
  • the UE performs a RACH procedure, for example, RRC connection establishment with the T-DeNB and the T-RN may be performed in parallel.
  • FIG. 6 is a message interaction diagram of handover of a UE to a third base station by a second base station in a case where the first base station and the second base station are independent of each other.
  • the first base station and the second base station independently of each other indicate that the first base station and the second base station can access the core network without going through the other party.
  • the first base station and the second base station may be one of a Home eNB, a Pico eNB, a DeNB, an RN, and other types of base stations, and the types of the two may be the same or different.
  • there is an RRC connection between the UE and the second base station and there may or may not be an RRC connection with the first base station.
  • the UE simultaneously uses the carriers of the first base station and the second base station for traffic, and the second base station is an Anchor (alarm) base station.
  • the UE sends a measurement report to the second base station, where the measurement report carries the report value measured by the UE under the coverage of the second base station and/or the first base station.
  • the second base station makes a handover decision based on the measurement report.
  • the second base station acquires bearer context information of the UE from the first base station.
  • the second base station sends a handover request to the third base station, where the bearer carries all bearer context information of the UE on the first and second base stations, and performs a handover negotiation process with the third base station.
  • This process can reuse the handover negotiation process in LTE R10.
  • a handover response agreeing to handover is returned to the second base station, and the second base station performs data forwarding to the third base station based on the handover response.
  • the second base station when the second base station receives the handover response that the third base station agrees to handover, the second base station sends a handover indication to the first base station, so that the first base station forwards the UE data to the third base station based on the handover indication.
  • the second base station sends a handover command to the UE.
  • the send handover command can also be executed before the handover indication is sent, or concurrently.
  • the UE performs a RACH access procedure to handover to the third base station.
  • Figure 7 is a message interaction diagram of handover of a UE by a second base station to a third base station and a fourth base station in a case where the first base station and the second base station are independent of each other.
  • the UE needs to be handed over to two target base stations.
  • the third base station and the fourth base station may be one of a Home eNB, a Pico eNB, a DeNB, an RN, and other types of base stations, and there is no restriction on whether the third base station and the fourth base station need to access the core network via the other party.
  • an RRC connection is established between the UE and the second base station, and there may or may not be an RRC connection with the first base station, and the UE uses the carrier of the first base station and the second base station to communicate, and And the second base station is an Anchor base station.
  • S710, S720, and S730 are basically the same as S610, S620, and S630.
  • the second base station sends a handover request to the third base station and the fourth base station, respectively.
  • the base station identifier of the third base station and the fourth base station is carried in the handover request, and carries the bearer context information of the UE on the first base station and the second base station.
  • the third base station and the fourth base station can negotiate to determine how to allocate the bearer of the UE.
  • the UE can perform handover.
  • the third base station and the fourth base station can also negotiate who is the primary site.
  • the primary station e.g., the third base station
  • the fourth base station returns a handover response agreeing to the handover to the second base station.
  • the primary station e.g., the third base station
  • the fourth base station returns a handover response agreeing to the handover to the second base station.
  • both can return a handover response to the second base station.
  • the second base station sends a handover indication to the first base station to instruct the first base station to perform data forwarding to the third base station and the fourth base station.
  • the second base station also forwards data to the third base station and the fourth base station when receiving the handover response.
  • S770 the second base station sends a handover command to the UE.
  • S760 and S770 can be executed concurrently, and S760 can also be executed after S770.
  • the UE performs a RACH procedure, for example, RRC connection establishment with the third base station and the fourth base station may be performed in parallel.
  • FIG. 8 is a flow diagram of a handover method 800 in accordance with an embodiment of the present invention.
  • the method 800 includes: in S810, when a handover of a UE is required, sending a handover request to a first base station serving a UE, so that the first base station performs a bearer context of the UE on the first base station.
  • the information is added to the handover request and forwarded to the target base station.
  • the handover command is sent to the UE to switch the UE to the target base station.
  • method 800 can be performed by a second base station.
  • the first base station and the second base station are source base stations that provide services for the UE before handover, and the second base station that performs UE handover has an RRC connection with the UE, There may or may not be an RRC connection between a base station and a UE, and the second base station is an Anchor base station.
  • the second base station needs to access the core network via the first base station, that is, the data sent by the second base station to the network side needs to be forwarded via the first base station, for example, the second base station may be an RN, and the first base station may be a DeNB.
  • the handover request is sent to the target base station. Since the message sent by the second base station to the network side needs to be sent via the first base station, the first base station receives the handover request. When the first base station receives the handover request, the first base station actively adds the bearer context information of the UE to the handover request, and then forwards the information to the target base station. In this way, the target base station can obtain all bearer context information of the UE on the first and second base stations from the handover request, and can further determine whether to accept handover of the UE.
  • the target base station when the target base station agrees to handover to the UE, the target base station returns a handover request for agreeing to handover to the first base station, and the first base station commands the UE to perform handover.
  • the second base station performing the handover does not acquire the bearer context of the UE on the first base station.
  • Information it is also possible to switch the UE to the target base station.
  • the first base station needs to add the bearer context information to the received handover request, so that the target base station can help determine whether to accept the handover based on all the bearer context information, so that the UE in the carrier aggregation state can be smoothly switched to
  • the new base station can quickly restore the current service of the UE and improve the user communication experience.
  • FIG. 9 is a flow diagram of a handover method 900 in accordance with an embodiment of the present invention.
  • the method 900 is basically the same as the technical solution of the method 800, but is described from different execution subjects.
  • the method 900 includes: receiving, in S910, a handover request sent by a first base station for a UE that needs to be handed over; in S920, adding bearer context information of the UE on the second base station to the received handover request And transmitting the handover request to the target base station, where the bearer context information is used by the target base station to determine whether to accept the UE handover; in S930, sending, to the first base station, a handover response of the consent handover returned by the target base station, to indicate that the first base station is based on the handover Responding to sending a handover command to the UE, The handover command is used to instruct the UE to handover to the target base station.
  • method 900 can be performed by a second base station.
  • the second base station and the first base station are source base stations of the UE, and the first base station performing UE handover has an RRC connection with the UE, and the second base station may or may not have an RRC connection with the UE, and the first base station is an Anchor base station.
  • the first base station can access the core network via the second base station.
  • the first base station may be an RN and the second base station may be a DeNB.
  • the first base station determines that the UE needs to be handed over based on the measurement report reported by the UE, and sends a handover request.
  • the second base station since the message sent by the first base station to the network side needs to be via the second base station, the second base station receives the handover request sent by the UE. Upon receiving the handover request, the second base station adds the bearer context information of the UE on the second base station to the handover request. Thereafter, the handover request to which the bearer context information on the second base station is added is forwarded to the target base station.
  • a handover response agreeing to the handover is sent.
  • the second base station forwards to the first base station after receiving the handover response.
  • the UE is commanded by the first base station to perform the handover.
  • the first base station performing the handover does not acquire the bearer context of the UE on the second base station.
  • Information it is also possible to switch the UE to the target base station.
  • the second base station needs to add the bearer context information to the received handover request, so that the target base station can help determine whether to accept the handover based on all the bearer context information, so that the UE in the carrier aggregation state can be smoothly switched to
  • the new base station can quickly restore the current service of the UE and improve the user communication experience.
  • the target base station may include the first target base station and the second target base station.
  • the handover request needs to carry the base station identifier of the first target base station and the base station identifier of the second target base station.
  • the first target base station when the first target base station receives the handover request, the first target base station is based on the second destination.
  • the base station identifier of the target base station negotiates with the second target base station to determine the bearer of the UE that the first target base station and the second target base station need to bear.
  • the first target base station and the second target base station negotiate to determine the bearers of the respective bearers, it is possible to switch the UE to the first target base station and the second target base station.
  • the first target base station may determine the primary site in consultation with the second target base station based on the base station identity of the second target base station.
  • the primary site may be determined based on the order in which the first target base station and the second target base station receive the handover request.
  • the primary site can be determined based on a predetermined configuration.
  • the primary site may be determined according to an order in which the first target base station and the second target base station establish an RRC connection with the UE.
  • the primary station may be determined according to the sequence of the base station identifier of the first target base station and the base station identifier of the second target base station according to the handover request.
  • the primary site may be determined based on a response message returned by the second target base station in response to the request sent by the first target base station to determine the request message of the primary site.
  • FIG. 10 is a message interaction diagram of a UE switching to a third base station by a second base station if the second base station needs to access the core network via the first base station.
  • the second base station is an RN
  • the first base station is a DeNB, and may be represented as an S-RN and an S-DeNB because it is a source base station
  • the third base station is a DeNB, and may be represented by a target base station. It is a T-DeNB.
  • the first, second, and third base stations can also be other types of base stations, and the message interaction described in this example can also be applied to other similar network architectures.
  • the UE maintains an independent RRC connection with the S-RN, and the UE and the S-DeNB may or may not have an RRC connection.
  • the UE is controlled by the S-RN, which is an Anchor base station.
  • the UE sends a measurement report to the S-RN, and carries the UE in the S-RN in the measurement report. And/or measured values of cells under the S-DeNB.
  • the S-RN makes a handover decision based on the measurement report.
  • the S-RN sends a handover request to the T-DeNB, and the handover request needs to be via the S-DeNB.
  • the S-DeNB adds the bearer context information of the UE on the S-DeNB to the handover request, and forwards the added handover request to the T-DeNB.
  • the T-DeNB After the T-DeNB agrees to the handover of the UE, it returns a handover response to the S-RN, and the handover response first arrives at the S-DeNB. Since the S-DeNB receives the handover response of the consent handover, the S-DeNB can forward the data to the T-DeNB as in the related art. The T-DeNB can also forward the data to its RN (represented by T-RN) if it wants its RN to also bear part of the UE's bearer.
  • the S-DeNB forwards the handover response to the S-RN.
  • the S-RN can also forward data to the T-DeNB as in the related art.
  • the T-DeNB can also forward the data to the T-RN.
  • the S-RN sends a handover command to the UE.
  • the UE performs a RACH access procedure to handover to the T-DeNB.
  • the T-DeNB may indicate that the S-DeNB releases the related resources based on the base station identifier of the S-DeNB.
  • the UE may also actively request the S-DeNB to release its own context signal after switching to the T-DeNB.
  • FIG. 11 is the second base station if the second base station needs to access the core network via the first base station.
  • the UE switches to a message interaction diagram of the third base station and the fourth base station.
  • the first base station and the second base station are still S-DeNB and S-RN, respectively;
  • the third base station and the fourth base station are both target base stations, which may be any type of base station, and it is assumed here that the third base station is The eNB, the fourth base station is a Pico eNB.
  • an RRC connection exists between the UE and the S-RN, and there may or may not be an RRC connection between the UE and the S-DeNB, and the S-RN is an Anchor base station.
  • the UE sends a measurement report to the S-RN, where the measurement report carries the measured value of the cell of the UE under the S-RN and/or the S-DeNB.
  • the S-RN makes a handover decision based on the measurement report.
  • the S-RN sends a handover request to the eNB and the Pico eNB, respectively, and the handover request needs to be via the S-DeNB.
  • the SeNB needs to carry the base station identifier of the eNB and the Pico eNB in the handover request.
  • the S-DeNB adds the bearer context information of the UE on the S-DeNB to the handover request, and sends the added handover request to the eNB. Forwarded with the Pico eNB.
  • the eNB and the Pico eNB may determine how to allocate the bearers of the UE on the S-RN and the S-DeNB according to the base station identity negotiation of the opposite party. If the two can accept the handover of the UE, it means that it is possible for both to accept the handover of the UE. In addition, the eNB and the Pico eNB can also negotiate who is the primary site.
  • the primary station (assumed to be a Pico eNB) in the eNB and the Pico eNB returns a handover response that agrees to the handover to the S-RN, and may carry the UE bearer beared by the eNB and the Pico eNB in the handover response.
  • the handover response first arrives at the S-DeNB, and the S-DeNB performs data forwarding to the eNB and the Pico eNB.
  • the S-DeNB forwards the handover response to the S-RN, and the S-RN forwards the data to the eNB and the Pico eNB.
  • the S-RN instructs the UE to perform handover.
  • the UE performs a RACH access procedure, for example, RRC connection establishment of the eNB and the Pico eNB may be performed in parallel.
  • Figure 12 is a flow diagram of a handover method 1200 in accordance with an embodiment of the present invention.
  • the method 1200 includes: in S1210, when a handover of a UE is required, sending a handover request to a first target base station and a second target base station, where the handover request carries bearer context information of the UE, and the first target base station Base station identity and base station identity of the second target base station to enable the first target
  • the base station determines, according to the base station identifier of the second target base station, the bearer related to the bearer context information that is required to be beared by the second target base station; in S1220, when the first target base station and the second target base station receive the handover of the agreed handover After the response, a handover command is sent to the UE to instruct the UE to handover to the first target base station and the second target base station.
  • the method 1200 can be performed by a source base station of the UE, and the source base station switches the UE. Regardless of whether the UE uses carrier aggregation technology before handover, after handover, the UE needs to establish a connection with two target base stations.
  • the source base station sends a handover request to the first and second target base stations, where the handover request carries the bearer context information of the UE on the source base station. If the UE needs to change the bearer on the source base station, the UE needs to be changed. The other bearer on the source base station that provides the service, the handover request carries the bearer context information of the UE on the two source base stations.
  • the base station identifiers of the first and second target base stations are also required to be carried in the handover request, so that they can mutually recognize the existence of the other party and interact with each other based on the base station identifier of the other party, thereby implementing handover of the UE.
  • the source base station After receiving the handover response that agrees to the handover, the source base station performs data forwarding to the first target base station and the second target base station, respectively, so that the current service of the UE can be quickly restored, and the handover command is sent to the UE to enable the UE. Switching to the first target base station and the second target base station.
  • FIG. 13 is a flowchart of a handover method 1300 according to an embodiment of the present invention.
  • the method 1300 is substantially the same as the technical solution of the method 1200, but the execution subject is different.
  • the method 1300 includes: in S1310, receiving, by the source base station, a handover request sent by the UE that needs to be handed over, the handover request carrying the bearer context information of the UE and the base station identifier of the first target base station; in S1320, based on the The base station identifier of a target base station negotiates with the first target base station to determine bearers related to the bearer context information that are required to be beared by each other; in S1330, when the negotiation is successful, the handover response that agrees to the handover is returned to the source base station.
  • method 1300 can be performed by a second target base station.
  • the first target base station and the second target base station are target base stations to which the UE needs to be handed over, and the UE needs to establish an RRC connection with both the first and second target base stations.
  • S1310 to S1330 refer to the descriptions of S1210 and S1220.
  • the second target base station may further determine the primary site with the first target base station based on the base station identity of the first target base station.
  • the second target base station may determine to determine the primary site between the first and second target base stations. For example, according to a predetermined configuration, the second target base station can determine the primary site. For another example, according to the order in which the first target base station and the second target base station establish an RRC connection with the UE, the second target base station can determine the primary site between the two. For another example, the second target base station can determine the primary site between the two according to the sequence of the base station identifier of the first target base station and the base station identity of the second target base station.
  • the response message returned by the first target base station in response to the request sent by the second target base station to the first target base station to determine the request message of the primary station can determine the request message of the primary station.
  • the second target base station can determine the primary site between the two.
  • the two target base stations may be determined according to the base station identifier negotiation.
  • the burden of the UE is carried, so that the UE can be switched to the two target base stations, and the current service of the UE can be quickly restored, and the communication experience of the user is enhanced.
  • FIG. 14 is a flow diagram of a handover method 1400 in accordance with an embodiment of the present invention.
  • the method 1400 includes: in S1410, when the UE establishes an RRC connection with the first base station and the second base station, and when the UE needs to be handed over from the second base station to the target base station, to the target base station.
  • Sending a handover request carrying the identity of the base station of the first base station, so that the target base station interacts with the first base station based on the base station identifier of the first base station; and after receiving the handover response of the agreed handover returned by the target base station, sending the handover response to the UE
  • a handover command is instructed to handover the UE to the target base station.
  • method 1400 can be performed by a second base station, which is a source base station. Both the first base station and the second base station establish an RRC connection with the UE, and the second base station is an Anchor base station.
  • the handover performed at this time is to handover the UE from the second base station to the target base station, and the target base station may be one or multiple, but the RRC connection between the UE and the first base station remains unchanged.
  • the second base station sends a handover request, and needs to carry bearer context information of the UE on the second base station, so that the target base station accepts the bearer of the UE on the second base station. It is important that the base station identifier of the first base station is carried in the switching request, so that the target base station can find the first base station by using the identifier, and then interact with the first base station to better serve the UE.
  • the second base station switches the UE to the target base station.
  • the switched UE maintains an RRC connection with the first base station and the target base station, and the target base station can communicate or interact with the first base station by using the base station identifier of the first base station.
  • the interaction of the target base station with the first base station may occur before the handover is completed, or may occur after the handover is completed.
  • the target base station may negotiate with the first base station whether the UE bearer needs to be transferred based on the base station identity of the first base station. For example, if the UE has 4 bearers on the first base station and 8 bearers on the target base station after handover, the target base station can negotiate with the first base station whether two of the 8 bearers can be transferred to the first On a base station.
  • the target base station may switch the UE from the two source base stations (ie, the target base station and the first base station) to the new base station based on the base station identifier of the first base station. For example, as described above, the target base station may acquire bearer context information of the UE from the first base station, send a handover indication to the first base station, and the like based on the base station identifier of the first base station.
  • the target base station when it is required to switch an RRC connection to a UE having two RRC connections, the target base station can be quickly discovered by carrying the base station identifier of the source base station that maintains the RRC connection unchanged in the handover request.
  • the source base station interacts with it to achieve better cooperation between the two to serve the UE, so that the impact of the handover on the user communication experience can be reduced.
  • Figure 15 is a flow diagram of a handover method 1500 in accordance with an embodiment of the present invention.
  • Method 1500 is substantially identical to method 1400, but has different execution principals.
  • the method 1500 includes: in S1510, when the UE establishes an RRC connection with the first base station and the second base station respectively, when the UE needs to be handed over from the second base station to the target base station, receiving the second The base station sends a handover request carrying the base station identifier of the first base station; in 1520, the first base station is exchanged based on the base station identifier; and in S1530, when the handover is determined based on the handover request, the handover of the UE is completed with the second base station.
  • method 1500 can be performed by a target base station.
  • S1510 to S1530 refer to S1410 and S1420 in the above method 1400. To avoid repetition, details are not described herein again.
  • S1520 is executed before S1530, S1520 can also be executed after S1530.
  • the target base station when it is required to switch an RRC connection to a UE having two RRC connections, the target base station can be quickly discovered by carrying the base station identifier of the source base station that maintains the RRC connection unchanged in the handover request.
  • the source base station interacts with it to achieve better cooperation between the two to serve the UE, so that the impact of the handover on the user communication experience can be reduced.
  • 16 is a message interaction diagram of the RRC connection of the first base station to the UE by the second base station when the first base station and the second base station both establish an RRC connection with the UE, and the second base station switches the UE to the target base station.
  • the first base station and the second base station may be any type of base station, the first base station and the first The two base stations can be independent of each other, or one party needs to access the core network via the other party.
  • An RRC connection is established between the first base station and the second base station and the UE, and the second base station is an Anchor base station.
  • the UE sends a measurement report to the second base station, where the measurement report may carry the measured value of the cell of the UE under the first base station and/or the second base station.
  • the second base station makes a handover decision based on the measurement report.
  • the second base station when the second base station determines that the UE needs to be handed over, but does not change the RRC connection between the UE and the first base station, the second base station sends a handover request to the target base station, where the handover request carries the UE at the second base station. Context information carried on. More importantly, the handover request carries the base station identity of the first base station to indicate to the target base station the presence of the first base station. Although only one target base station is shown in FIG. 16, the target base station may also have multiple, and those skilled in the art can easily think of how to implement it under the above-described inspiration, for example, carrying the first target base station in the handover request. And the base station identifier of the second target base station, so that the two negotiate to determine how to allocate the bearer of the UE.
  • the second base station when the target base station agrees to handover, receives the handover response that the target base station agrees to handover, and forwards the UE data to the target base station.
  • the second base station sends a handover command to the UE.
  • the UE switches to the target base station.
  • the target base station can interact with the first base station before and/or after the handover is completed to better serve the UE.
  • FIG. 17 is a structural block diagram of a base station 1700 according to an embodiment of the present invention.
  • the base station 1700 includes an obtaining module 1710, a first sending module 1720, and a second sending module 1730, which can be implemented by using different processor units.
  • the acquisition module 1710 is configured to acquire the bearer context information of the UE on the first base station when the user equipment UE needs to be switched, and the first base station is the source base station of the UE.
  • the first sending module 1720 is configured to send a handover request to the target base station, and the handover request Carrying bearer context information, the bearer context information is used by the target base station to determine whether to accept the UE handover.
  • the second sending module 1730 is configured to send a handover command to the UE to instruct the UE to switch to the target base station after receiving the handover response of the agreed handover returned by the target base station.
  • the above and other operations and/or functions of the obtaining module 1710, the first sending module 1720, and the second sending module 1730 may refer to the related content in the above method 100, and are not repeated here to avoid repetition.
  • the base station when the UE uses the carrier aggregation before the handover, the base station can obtain the bearer context information of the UE on the first base station, so that the target base station can be based on all bearers on the first base station and the second base station.
  • the UE may be handed over from the first base station and the second base station to the target base station, so that the UE that is using the carrier aggregation is quickly switched, so that Increase the user's communication experience during the handover process.
  • Figure 18 is a block diagram showing the structure of a base station 1800 according to an embodiment of the present invention.
  • the obtaining module 1810, the first sending module 1820, and the second sending module 1830 in the base station 1800 are substantially the same as the obtaining module 1710, the first sending module 1720, and the second sending module 1730 in the base station 1700.
  • the base station 1800 may further include a third transmitting module 1840, which may be implemented by a processor unit.
  • the third sending module 1840 is configured to send a handover indication to the first base station to instruct the first base station to perform data forwarding to the target base station.
  • the acquisition module 1810 can include a first receiving unit 1812.
  • the first receiving unit 1812 is configured to receive bearer context information that is sent when the first base station updates the bearer context information.
  • the acquisition module 1810 may include a request unit 1814 and a second receiving unit 1816.
  • Requesting unit 1814 can be configured to request bearer context information from the first base station.
  • the second receiving unit 1816 is configured to receive bearer context information returned by the first base station.
  • the acquisition module 1810 may comprise a third receiving unit 1818.
  • the third receiving unit 1818 is configured to receive the bearer context information sent by the first base station based on the measurement report, the third sending module 1840, the first receiving unit 1812, the requesting unit 1814, the second receiving unit 1816, and the third receiving unit 1818.
  • the acquisition module 1810 may comprise a third receiving unit 1818.
  • the third receiving unit 1818 is configured to receive the bearer context information sent by the first base station based on the measurement report, the third sending module 1840, the first receiving unit 1812, the requesting unit 1814, the second receiving unit 1816, and the third receiving unit 1818.
  • the base station can enable the first base station to perform data forwarding to the target base station by sending a handover indication to the first base station that does not need to perform the handover, thereby facilitating rapid recovery of the current service of the UE after the UE is switched. Thereby improving the user's communication experience.
  • Figure 19 is a block diagram showing the structure of a base station 1900 according to an embodiment of the present invention.
  • the base station 1900 includes a first transmitting module 1910, a second transmitting module 1920, and a third transmitting module.
  • the first sending module 1910 is configured to send a handover request to the target base station when the user equipment UE needs to be handed over.
  • the second sending module 1920 after receiving the handover response of the agreed handover returned by the target base station, sends a handover indication to the first base station serving the UE to instruct the first base station to perform data forwarding to the target base station.
  • the third sending module 1930 is configured to send a handover command to the UE to instruct the UE to switch to the target base station.
  • first sending module 1910, the second sending module 1920, and the third sending module 1930 may refer to related content in the foregoing method 300. To avoid repetition, details are not described herein again.
  • the base station when the handover is required, may, by sending a handover indication to the first base station that does not know the handover, may instruct the first base station to forward the UE data on the target base station to the target base station, so that The current service of the UE is quickly restored after the handover, and the communication experience of the user is increased.
  • Figure 20 is a block diagram showing the structure of a base station 2000 according to an embodiment of the present invention.
  • the base station 2000 can include a transmitting module 2010 and a receiving module 2020, which can be processor units, respectively.
  • the sending module 2010 is configured to: when the user equipment UE needs to be handed over, The serving first base station sends a handover request, so that the first base station adds the bearer context information of the UE on the first base station to the handover request and forwards the information to the target base station, and the bearer context information is used by the target base station to determine whether to accept the UE handover.
  • the receiving module 2020 is configured to send a handover command to the UE to instruct the UE to switch to the target base station after receiving the handover response of the consent handover returned by the target base station by the first base station.
  • the above and other operations and/or functions of the sending module 2010 and the receiving module 2020 can refer to the related content in the above method 800. To avoid repetition, details are not described herein again.
  • the base station when a base station is used to establish a data connection with the base station and the first base station, the base station performing the handover does not acquire the bearer context information of the UE on the first base station. Switching the UE to the target base station can be achieved. At this time, the first base station needs to add the bearer context information to the received handover request, so that the target base station can help determine whether to accept the UE handover based on all the bearer context information, so that the UE handover in the carrier aggregation state can be smoothly implemented. To the new base station, and can quickly restore the current service of the UE, and improve the user communication experience.
  • Figure 21 is a block diagram showing the structure of a base station 2100 according to an embodiment of the present invention.
  • the base station 2100 can include a receiving module 2110, an adding module 2120, and a transmitting module 2130, which can be different processor units, respectively.
  • the receiving module 2110 is configured to receive, by the first base station, a handover request sent by the user equipment UE that needs to be switched.
  • the adding module 2120 is configured to add bearer context information of the UE on the base station to the received handover request, and send the handover request to the target base station, where the bearer context information is used by the target base station to determine whether to accept the UE handover.
  • the sending module 2130 is configured to send, to the first base station, a handover response of the consent handover returned by the target base station, to indicate that the first base station sends a handover command to the UE according to the handover response, where the handover command is used to indicate that the UE switches to the target base station.
  • the above and other operations and/or functions of the receiving module 2110, the adding module 2120, and the sending module 2130 may be referred to the related content in the foregoing method 900. To avoid repetition, details are not described herein.
  • a base station when a UE is used for handover, using a carrier aggregation
  • the first base station that performs the handover may perform handover of the UE to the target base station even if the bearer context information of the UE on the base station is not acquired.
  • the base station needs to add bearer context information to the received handover request, so that the target base station can help determine whether to accept the handover based on all bearer context information, so that the UE in the carrier aggregation state can be successfully switched to the new one.
  • the base station can quickly restore the current service of the UE and improve the user communication experience.
  • FIG. 22 is a block diagram showing the structure of a base station 2200 according to an embodiment of the present invention.
  • the base station 2200 can include a first transmitting module 2210 and a second transmitting module 2220, which can be processor units, respectively.
  • the first sending module 2210 is configured to: when the user equipment UE needs to be handed over, send a handover request to the first target base station and the second target base station, where the handover request carries the bearer context information of the UE, the base station identifier of the first target base station, and the second a base station identifier of the target base station, so that the first target base station determines, according to the base station identifier of the second target base station, the bearer related to the bearer context information that the first target base station and the second target base station need to bear, and the bearer context.
  • the information is used by the first target base station and the second target base station to determine whether to accept the UE handover.
  • the second sending module 2220 is configured to send a handover command to the UE to indicate that the UE switches to the first target base station and the second target base station after receiving the handover response of the consent handover returned by the first target base station and the second target base station.
  • first sending module 2210 and the second sending module 2220 may refer to related content in the foregoing method 1200. To avoid repetition, details are not described herein again.
  • the two target base stations can determine the bearer burden of the UE based on the base station identifier negotiation, thereby facilitating implementation.
  • the UE switches to the two target base stations, and can quickly restore the current service of the UE and enhance the communication experience of the user.
  • FIG. 23 is a block diagram showing the structure of a base station 2300 according to an embodiment of the present invention.
  • the base station 2300 includes a receiving module 2310, a first determining module 2320, and a transmitting module 2330, which may be processor units, respectively.
  • the receiving module 2310 is configured to receive a handover request sent by the source base station to the user equipment UE that needs to be handed over, where the handover request carries the bearer context information of the UE and the first target base.
  • the first determining module 2320 is configured to determine, according to the base station identifier of the first target base station, the bearer related to the bearer context information that is required to be undertaken by the first target base station.
  • the sending module 2330 is configured to: when the negotiation is successful, return a handover response that agrees to the handover to the source base station, so that the source base station sends a handover command to the UE to complete the handover based on the handover response.
  • the foregoing and other operations and/or functions of the receiving module 2310, the first determining module 2320, and the sending module 2330 may refer to related content in the foregoing method 1300. To avoid repetition, details are not described herein.
  • the base station may determine the bearer burden of the UE by negotiating with the first target base station based on the base station identifier of the first target base station that is carried in the handover request, thereby facilitating handover of the UE to the two target base stations. And can quickly restore the current service of the UE and enhance the communication experience of the user.
  • FIG. 24 is a block diagram showing the structure of a base station 2400 according to an embodiment of the present invention.
  • the receiving module 2410, the first determining module 2420, and the transmitting module 2430 in the base station 2400 are substantially the same as the receiving module 2310, the first determining module 2320, and the transmitting module 2330 in the base station 2300.
  • Base station 2400 can include a second determining module 2440, in accordance with an embodiment of the present invention.
  • the second determining module 2440 is configured to determine, according to the base station identifier of the first target base station, the primary station by negotiating with the first target base station.
  • the second determining module 2440 may include one of the first determining unit 2442, the second determining unit 2444, the third determining unit 2446, the fourth determining unit 2448, and the fifth determining unit 2449.
  • the first determining unit 2442 is configured to determine the primary site according to the sequence in which the base station 2400 and the first target base station receive the handover request.
  • the second determining unit 2444 can be configured to determine the primary site according to a predetermined configuration.
  • the third determining unit 2446 is configured to determine the primary site according to the sequence in which the base station 2400 and the first target base station establish an RRC connection with the UE.
  • the fourth determining unit 2448 is configured to determine the primary site according to the sequence of the base station identifier of the first target base station and the base station identifier of the base station 2400 according to the handover request.
  • the fifth determining unit 2449 is configured to determine, according to the request sent by the second target base station in response to the base station 2400 The response message returned by the request message of the primary site determines the primary site.
  • the above and other operations and/or functions of the second determining module 2440, the first determining unit 2442, the second determining unit 2444, the third determining unit 2446, the fourth determining unit 2448, and the fifth determining unit 2449 may refer to the above method 1300 and Corresponding parts of the method 200, in order to avoid repetition, will not be repeated here.
  • the base station may determine the primary site by negotiating with the first target base station in multiple manners based on the base station identifier of the first target base station carried in the handover request.
  • the base station can negotiate with the first target base station to determine the bearer of the UE, thereby facilitating the handover of the UE to the two target base stations, and quickly recovering the current service of the UE, and enhancing the communication experience of the user.
  • Figure 25 is a block diagram showing the structure of a base station 2500 according to an embodiment of the present invention.
  • the base station 2500 can include a first transmitting module 2510 and a second transmitting module 2520, which can be processor units, respectively.
  • the first sending module 2510 is configured to: when the user equipment UE establishes an RRC connection with the first base station and the second base station, when the UE needs to be handed over from the second base station to the target base station, send the first base station to the target base station.
  • the base station identifies a handover request, so that the target base station interacts with the first base station based on the base station identifier of the first base station.
  • the second sending module 2520 is configured to send a handover command to the UE to instruct the UE to switch to the target base station after receiving the handover response of the agreed handover returned by the target base station.
  • first sending module 2510 and the second sending module 2520 may refer to related content in the foregoing method 1400. To avoid repetition, details are not described herein again.
  • the target base station when it is required to switch an RRC connection to a UE having two RRC connections, the target base station can quickly find the base station by carrying the base station identifier of the source base station that maintains the RRC connection unchanged in the handover request.
  • the source base station interacts with it to achieve better cooperation between the two to serve the UE, so that the impact of the handover on the user communication experience can be reduced.
  • Figure 26 is a block diagram showing the structure of a base station 2600 according to an embodiment of the present invention.
  • the base station 2600 includes a receiving module 2610, an interaction module 2620, and a switching module 2630, which can be divided into Not a processor unit.
  • the receiving module 2610 is configured to: when the user equipment UE establishes an RRC connection with the first base station and the second base station, when the UE needs to be handed over from the second base station to the target base station, receive the first base station sent by the second base station The handover request of the base station identity.
  • the interaction module 2620 can be configured to interact with the first base station based on the base station identity.
  • the switching module 2630 is configured to complete handover of the UE with the second base station when determining to agree to handover based on the handover request.
  • the foregoing operations and/or functions of the receiving module 2610, the interaction module 2620, and the switching module 2630 may be referred to the related content in the foregoing method 1500. To avoid repetition, details are not described herein again.
  • the base station when it is required to switch an RRC connection to a UE having two RRC connections, the base station can quickly discover the base station identifier of the source base station that remains unchanged in the RRC connection carried in the handover request.
  • the source base station interacts with it to achieve better cooperation between the two to serve the UE, so that the impact of the handover on the user communication experience can be reduced.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM or technology Any other form of storage medium known.

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Abstract

一种切换方法和基站。该切换方法可以包括:当需要对UE进行切换时,获取UE在第一基站上的承载上下文信息;向目标基站发送切换请求,切换请求携带承载上下文信息;收到目标基站返回的同意切换的切换响应之后,向UE发送切换命令以使UE切换到目标基站。该切换方法还可以包括:当需要对UE进行切换时,向目标基站发送切换请求;收到目标基站返回的同意切换的切换响应之后,向为UE提供服务的第一基站发送切换指示,以使第一基站向目标基站进行数据转发;向UE发送切换命令以使UE切换到目标基站。基于上述技术方案,可以在使用多载波的情况下快速实现UE的切换,并快速恢复UE的当前业务,从而提高用户通信体验。

Description

切换方法和基站
本申请要求于 2011 年 5 月 25 日提交中国专利局、 申请号为 201110136652.4、 发明名称为"切换方法和基站"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领域, 并且更具体地, 涉及无线通信领域中的切换方 法和基站。 背景技术
3GPP LTE-A系统目前已经同意将载波汇聚技术作为其扩展系统带宽的方 法, 以支持高达 1G的峰值数据速率。载波汇聚的主要思想是将多个组成载波汇 聚成一个较大带宽的载波以支持高速数据速率。
用户设备(User Equipment , UE )可以聚合来自两个不同站点的载波, 从 而实现不同站点之间的载波汇聚。 例如, 当 UE处于小区边缘时, UE可以汇聚来 自宏基站的低频段的载波和来自中继站(Relay Node, RN ) 的高频段的载波。
当 UE对来自不同站点的载波进行使用时, UE与无线网络之间可以维持一个 无线资源连接 ( Radio Resource Control , RRC ) , 也可以维持多个无线资源 连接。 如在上述例子中, UE从宏基站和 RN接受服务, 与宏基站和 RN都建立有数 据连接, 但是 UE可以只与宏基站和 RN之一维持一个 RRC连接, 也可以同时与宏 基站和 RN两者维持两个 RRC连接。
在不同站点间载波汇聚的情况下,如果正在使用载波汇聚技术或者准备使 用载波汇聚技术的 UE需要进行切换,还没有相关的技术方案可以解决如何为这 样的 UE进行切换的问题。 也就是说, 第一, 当 UE基于载波汇聚技术而正从多个 站点接受服务时,如果需要对 UE进行切换,在相关技术中还不能实现对 UE快速 进行切换并快速恢复 UE当前业务; 第二, 不管 UE是否正在使用载波汇聚技术, 如果 UE希望切换之后使用载波汇聚技术,在相关技术中还不能将 UE直接切换到 两个站点并快速恢复 UE当前业务。
因此, 在对 UE切换之前或切换之后, 如果 UE需要使用载波汇聚技术, 如 何对 UE进行快速切换, 并快速恢复 UE当前业务, 从而提高用户体验, 是一个 急需解决的问题。
发明内容
本发明实施例提供了切换方法和基站,可以解决 UE在使用载波汇聚技术 的情况下进行切换的问题,使得可以为正在使用载波汇聚技术的 UE或者切换 后使用载波汇聚技术的 UE提供快速切换, 并可以为这样的 UE快速恢复 UE 切换前的业务, 从而提高用户的通信体验。
一方面, 本发明实施例提供了一种切换方法, 包括: 当需要对用户设备 UE进行切换时, 获取所述 UE在第一基站上的承载上下文信息, 所述第一基 站为所述 UE的源基站; 向目标基站发送切换请求, 所述切换请求携带所述承 载上下文信息, 所述承载上下文信息用于目标基站确定是否接受 UE切换; 收 到所述目标基站返回的同意切换的切换响应之后, 向所述 UE发送切换命令以 指示所述 UE切换到所述目标基站。
另一方面, 本发明实施例提供了一种切换方法, 包括: 当需要对用户设备
UE进行切换时, 向目标基站发送切换请求; 收到所述目标基站返回的同意切 换的切换响应之后, 向为所述 UE提供服务的第一基站发送切换指示, 以指示 所述第一基站向所述目标基站进行数据转发; 向所述 UE发送切换命令以指示 所述 UE切换到所述目标基站。
再一方面, 本发明实施例提供了一种切换方法、 包括: 当需要对用户设备 UE进行切换时, 向为所述 UE提供服务的第一基站发送切换请求, 以使所述 第一基站将所述 UE在所述第一基站上的承载上下文信息添加到所述切换请求 中并向所述目标基站转发,所述承载上下文信息用于所述目标基站确定是否接 受 UE切换; 收到所述第一基站发送的所述目标基站返回的同意切换的切换响 应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述目标基站。
又一方面, 本发明实施例提供了一种切换方法、 包括: 接收第一基站针对 需要切换的用户设备 UE发送的切换请求; 将所述 UE在第二基站上的承载上 下文信息添加到所接收的切换请求中, 并向目标基站发送该切换请求, 所述承 载上下文信息用于目标基站确定是否接受 UE切换; 向所述第一基站发送所述 目标基站返回的同意切换的切换响应,以指示所述第一基站基于所述切换响应 向所述 UE发送切换命令, 所述切换命令用于指示所述 UE切换到所述目标基 站。
又一方面, 本发明实施例提供了一种切换方法、 包括: 当需要对用户设备 UE进行切换时, 向第一目标基站和第二目标基站发送切换请求, 所述切换请 求携带所述 UE的承载上下文信息、所述第一目标基站的基站标识和所述第二 目标基站的基站标识,以使所述第一目标基站基于所述第二目标基站的基站标 识与所述第二目标基站协商确定所述第一目标基站和所述第二目标基站各自 需要承担的与所述承载上下文信息相关的承载,所述承载上下文信息用于所述 第一目标基站和所述第二目标基站确定是否接受 UE切换; 当收到所述第一目 标基站和所述第二目标基站返回的同意切换的切换响应之后, 向所述 UE发送 切换命令以指示所述 UE切换到所述第一目标基站和所述第二目标基站。
又一方面, 本发明实施例提供了一种切换方法、 包括: 接收源基站针对需 要切换的用户设备 UE发送的切换请求, 所述切换请求携带所述 UE的承载上 下文信息和第一目标基站的基站标识;基于所述第一目标基站的基站标识与所 述第一目标基站协商确定各自需要承担的与所述承载上下文信息相关的承载; 当协商成功时, 向所述源基站返回同意切换的切换响应。
又一方面, 本发明实施例提供了一种切换方法、 包括: 在用户设备 UE与 第一基站和第二基站分别建立有 RRC连接的情况下, 当需要将所述 UE从所 述第二基站切换到目标基站时,向所述目标基站发送携带所述第一基站的基站 标识的切换请求,以使所述目标基站基于所述第一基站的基站标识与所述第一 基站进行交互; 收到所述目标基站返回的同意切换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述目标基站。
又一方面, 本发明实施例提供了一种切换方法, 包括: 在用户设备 UE与 第一基站和第二基站分别建立有 RRC连接的情况下, 当需要将所述 UE从所 述第二基站切换到目标基站时,接收所述第二基站发送的携带所述第一基站的 基站标识的切换请求;基于所述基站标识与所述第一基站进行交互; 当基于所 述切换请求确定同意切换时, 与所述第二基站完成所述 UE的切换。
又一方面, 本发明实施例提供了一种基站, 包括: 获取模块, 用于当需要 对用户设备 UE进行切换时, 获取所述 UE在第一基站上的承载上下文信息, 所述第一基站为所述 UE的源基站; 第一发送模块, 用于向目标基站发送切换 请求, 所述切换请求携带所述承载上下文信息, 所述承载上下文信息用于目标 基站确定是否接受 UE切换; 第二发送模块, 用于收到所述目标基站返回的同 意切换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述 标基站。
又一方面, 本发明实施例提供了一种基站, 包括: 第一发送模块, 用于当 需要对用户设备 UE进行切换时, 向目标基站发送切换请求; 第二发送模块, 用于收到所述目标基站返回的同意切换的切换响应之后, 向为所述 UE提供服 务的第一基站发送切换指示,以指示所述第一基站向所述目标基站进行数据转 发; 第三发送模块, 用于向所述 UE发送切换命令以指示所述 UE切换到所述 目标基站。 又一方面, 本发明实施例提供了一种基站, 包括: 发送模块, 用于当需要 对用户设备 UE进行切换时,向为所述 UE提供服务的第一基站发送切换请求, 以使所述第一基站将所述 UE在所述第一基站上的承载上下文信息添加到所述 切换请求中并向所述目标基站转发,所述承载上下文信息用于所述目标基站确 定是否接受 UE切换; 接收模块, 用于收到所述第一基站发送的所述目标基站 返回的同意切换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切 换到所述目标基站。
又一方面, 本发明实施例提供了一种基站, 包括: 接收模块, 用于接收第 一基站针对需要切换的用户设备 UE发送的切换请求; 添加模块, 用于将所述 UE在所述基站上的承载上下文信息添加到所接收的切换请求中, 并向目标基 站发送该切换请求, 所述承载上下文信息用于所述目标基站确定是否接受 UE 切换; 发送模块, 用于向所述第一基站发送所述目标基站返回的同意切换的切 换响应, 以指示所述第一基站基于所述切换响应向所述 UE发送切换命令, 所 述切换命令用于指示所述 UE切换到所述目标基站。
又一方面, 本发明实施例提供了一种基站, 包括: 第一发送模块, 用于当 需要对用户设备 UE进行切换时, 向第一目标基站和第二目标基站发送切换请 求, 所述切换请求携带所述 UE的承载上下文信息、 所述第一目标基站的基站 标识和所述第二目标基站的基站标识,以使所述第一目标基站基于所述第二目 标基站的基站标识与所述第二目标基站协商确定所述第一目标基站和所述第 二目标基站各自需要承担的与所述承载上下文信息相关的承载,所述承载上下 文信息用于所述第一目标基站和所述第二目标基站确定是否接受 UE切换; 第 二发送模块,用于当收到所述第一目标基站和所述第二目标基站返回的同意切 换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述第一 目标基站和所述第二目标基站。
又一方面, 本发明实施例提供了一种基站, 包括: 接收模块, 用于接收源 基站针对需要切换的用户设备 UE发送的切换请求, 所述切换请求携带所述 UE的承载上下文信息和第一目标基站的基站标识; 第一确定模块, 用于基于 所述第一目标基站的基站标识与所述第一目标基站协商确定各自需要承担的 与所述承载上下文信息相关的承载; 发送模块, 用于当协商成功时, 向所述源 基站返回同意切换的切换响应。
又一方面, 本发明实施例提供了一种基站, 包括: 第一发送模块, 用于在 用户设备 UE与第一基站和第二基站分别建立有 RRC连接的情况下, 当需要 将所述 UE从所述第二基站切换到目标基站时, 向所述目标基站发送携带所述 第一基站的基站标识的切换请求,以使所述目标基站基于所述第一基站的基站 标识与所述第一基站进行交互; 第二发送模块, 用于收到所述目标基站返回的 同意切换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所 述目标基站。
又一方面, 本发明实施例提供了一种基站, 包括: 接收模块, 用于在用户 设备 UE与第一基站和第二基站分别建立有 RRC连接的情况下, 当需要将所 述 UE从所述第二基站切换到目标基站时,接收所述第二基站发送的携带所述 第一基站的基站标识的切换请求; 交互模块, 用于基于所述基站标识与所述第 一基站进行交互; 切换模块, 用于当基于所述切换请求确定同意切换时, 与所 述第二基站完成所述 UE的切换。
基于上述技术方案, 当 UE切换之前使用载波汇聚而与第一基站和第二基 站都建立有数据连接时,进行切换的第二基站通过获取 UE在第一基站上的承 载上下文信息和 /或向不能得知对 UE进行切换的第一基站发送切换指示以使 第一基站进行数据转发,可以在不同场景下将 UE切换到目标基站并快速恢复 UE的当前业务, 从而多载波下的 UE可以得到快速切换处理, 使得可以增加 用户在切换过程中的通信体验。
当需要将 UE切换到两个目标基站而使 UE在切换之后使用载波聚合时, 通过在切换请求中同时携带目标基站的基站标识,目标基站之间可以基于基站 标识来与对方协商确定 UE承载的分配, 从而可以使 UE顺利切换到两个目标 基站而实现切换后的载波聚合, 并可以快速恢复 UE 的当前业务, 这样即便 UE需要使用载波聚合也可以进行快速切换, 从而可以增强用户的通信体验。
此外, 当需要对具有两个 RRC连接的 UE切换一个 RRC连接时, 通过在 切换请求中携带保持 RRC连接不变的源基站的基站标识, 可以使目标基站快 速发现该源基站并与之进行交互,从而实现两者更好地配合来为 UE进行服务, 使得可以减小切换对用户通信体验的影响。 附图说明
为了更清楚地说明本发明实施例的技术方案,下面将对实施例中所需要使 用的附图作筒单地介绍,显而易见地, 下面描述中的附图仅仅是本发明的一些 实施例, 对于本领域技术人员来讲, 在不付出创造性劳动的前提下, 还可以根 据这些附图获得其他的附图。
图 1是根据本发明实施例的切换方法的流程图。
图 2是根据本发明实施例的另一切换方法的流程图。
图 3是根据本发明实施例的再一切换方法的流程图。
图 4是在第二基站需要经由第一基站接入核心网的情况下由第二基站将 UE切换到第三基站的消息交互图。
图 5 是在第二基站需要经由第一基站接入核心网的情况下由第一基站将
UE切换到第三基站和第四基站的消息交互图。
图 6是在第一基站和第二基站相互独立的情况下由第二基站将 UE切换到 第三基站的消息交互图。
图 7是在第一基站和第二基站相互独立的情况下由第二基站将 UE切换到 第三基站和第四基站的消息交互图。 图 8是根据本发明实施例的又一切换方法的流程图。
图 9是根据本发明实施例的又一切换方法的流程图。
图 10是在第二基站需要经由第一基站接入核心网的情况下由第二基站将 UE切换到第三基站的消息交互图。
图 11是在第二基站需要经由第一基站接入核心网的情况下由第二基站将
UE切换到第三基站和第四基站的消息交互图。
图 12是根据本发明实施例的又一切换方法的流程图。
图 13是根据本发明实施例的又一切换方法的流程图。
图 14是根据本发明实施例的又一切换方法的流程图。
图 15是根据本发明实施例的又一切换方法的流程图。
图 16是在第一基站和第二基站都与 UE建立有 RRC连接的情况下由第二 基站将 UE切换到目标基站而保留第一基站与 UE的 RRC连接的消息交互图。
图 17是根据本发明实施例的基站的结构框图。
图 18是根据本发明实施例的另一基站的结构框图。
图 19是根据本发明实施例的再一基站的结构框图。
图 20是根据本发明实施例的又一基站的结构框图。
图 21是根据本发明实施例的又一基站的结构框图。
图 22是根据本发明实施例的又一基站的结构框图。
图 23是根据本发明实施例的又一基站的结构框图。
图 24是根据本发明实施例的又一基站的结构框图。
图 25是根据本发明实施例的又一基站的结构框图。
图 26是根据本发明实施例的又一基站的结构框图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例的技术方案进行清 楚、 完整地描述。 显然, 所描述的实施例是本发明的一部分实施例, 而不是全 部实施例。基于本发明中的所述实施例, 本领域技术人员在没有做出创造性劳 动的前提下所获得的所有其他实施例, 都应属于本发明保护的范围。
首先, 结合图 1描述根据本发明实施例的切换方法 100。
如图 1所示, 方法 100包括: 在 S110中, 当需要对 UE进行切换时, 获 取 UE在第一基站上的承载上下文信息, 第一基站为 UE的源基站; 在 S120 中, 向目标基站发送切换请求, 切换请求携带承载上下文信息, 承载上下文信 息用于目标基站确定是否接受 UE切换; 在 S130中, 收到目标基站返回的同 意切换的切换响应之后, 向 UE发送切换命令以指示 UE切换到目标基站。
方法 100可以由第二基站执行。第一基站和第二基站是切换之前为 UE提 供服务的源基站, UE和第二基站之间建立有 RRC连接, UE和第一基站之间 可以有、 也可以没有 RRC连接, 由第二基站执行 UE的切换。 第二基站由于 不知道 UE在第一基站上的承载上下文信息, 因此需要获取该上下文信息, 并 在之后向目标基站发送切换请求。 这样, 目标基站可以知道 UE在第一基站和 第二基站上的所有承载上下文信息,从而基于这些承载上下文信息等确定是否 可以接受 UE切换。 如果同意接受 UE切换, 则向第二基站返回同意切换的切 换响应, 以使 UE可以切换到目标基站。 目标基站在同意 UE的切换之后, 可 以由自己为 UE的承载提供服务, 也可以由自己为 UE的承载中的一部分提供 服务、 而将承载的另一部分分配给例如自己的 RN来提供相应服务。
在 S110中, 由于第二基站不知道 UE在第一基站上的承载上下文信息, 因此需要从第一基站获取 UE在其上的承载上下文信息。承载上下文信息是指 终端承载列表, 具体包括承载标示 (E-RAB ID ) , 承载所对应的 QoS 参数 ( E-RAB Level QoS Parameters ) ,上行或者下行 GTP tunnel端点地址( UL/DL GTP Tunnel Endpoint )等等。
根据本发明的一个实施例,可以接收第一基站更新 UE在第一基站上的承 载上下文信息时发送的承载上下文信息。
当第一基站更新 UE在其上的承载上下文信息时, 第一基站可以将更新后 的承载上下文信息主动发送给第二基站。第一基站可以周期性更新 UE的承载 上下文信息, 或者通过事件触发更新 UE的承载上下文信息等。
根据本发明的一个实施例,可以向第一基站请求 UE在第一基站上的承载 上下文信息, 并接收第一基站返回的该承载上下文信息。
第二基站可以请求第一基站上 UE的承载上下文信息,从而获取该承载上 下文信息。
根据本发明的一个实施例,可以接收第一基站基于测量报告结果触发发送 的该承载上下文信息。
在 UE与第一基站建立有 RRC连接时, 第一基站也可以收到 UE发送的 测量报告。 根据测量报告中的结果, 第一基站可以主动向第二基站发送 UE在 第一基站上的承载上下文信息。 例如, 当测量报告中特定参数低于阈值时, 第 一基站向第二基站发送承载上下文信息。
通过从第一基站获取 UE的承载上下文信息, 第二基站可以知晓 UE在第 二基站和第一基站上的所有承载上下文信息。
在 S120中, 由于由第二基站执行 UE的切换, 所以切换请求需要如相关 技术那样携带 UE在第二基站上的承载上下文信息。 此外, 切换请求还需要携 带第二基站在 S110中获取的 UE在第一基站上的承载上下文信息。 这样, 目 标基站可以获取 UE所有的承载上下文信息,并在判断是否接受 UE的切换中, 使用切换请求中携带的 UE的所有承载上下文信息。
在 S130中, 如果目标基站接受 UE切换, 则向第二基站返回同意切换的 切换响应。 第二基站基于该响应来命令 UE进行切换。
根据本发明实施例提供的切换方法, 当 UE在切换之前使用载波汇聚时, 第二基站通过获取 UE在第一基站上的承载上下文信息,可以使目标基站基于 第一基站和第二基站上的所有承载来做是否同意切换的判断,这样在目标基站 同意切换的情况下, 可以将 UE从第一基站和第二基站切换到目标基站, 从而 可以在使用多载波的情况下快速实现 UE的切换,并快速恢复 UE的当前业务, 使得可以增加用户在切换过程中的通信体验。
图 2是根据本发明实施例的切换方法 200的流程图。 方法 200中的 S210 至 S230与方法 100中的 S110至 S130基本相同。
在 S240中, 向第一基站发送切换指示, 以指示第一基站向目标基站进行 数据转发。
进行切换的第二基站当收到同意切换的切换响应之后,可以向第一基站发 送切换指示, 通过该切换指示, 命令第一基站将 UE承载上的数据转发给目标 基站。 这样, 当 UE切换到目标基站之后, 可以快速为 UE恢复当前业务。
虽然在图 2中, S240中的发送切换指示在 S230中的发送切换命令之后执 行, 但是 S240中的发送切换指示也可以在 S230中的发送切换命令之前执行、 或同时执行, 其执行顺序对本发明的保护范围没有限制。
根据本发明的一个实施例,在第一基站与 UE建立有 RRC连接的情况下, 切换请求可以携带第一基站的基站标识, 以向目标基站指示第一基站与 UE建 立有 RRC连接。
由于执行 UE切换的源基站是第二基站, 所以第二基站与 UE之间存在 RRC连接。 如果第一基站也与 UE之间有 RRC连接, 则在切换请求中携带第 一基站的基站标识。这样可以向目标基站通知第一基站的基站标识, 以使目标 基站知道 UE不仅正在使用载波汇聚技术而且具有多条 RRC连接, 并在需要 时可以利用第一基站的基站标识与第一基站进行交互。
根据本发明的一个实施例, 当 UE切换到目标基站之后, 目标基站基于第 一基站的基站标识指示第一基站该终端切换成功, 释放 UE相关资源。
由于目标基站通过切换请求知道第一基站的存在, 因此在 UE切换到目标 基站并断开与第一基站的连接的情况下,目标基站可以基于第一基站的基站标 识来通知第一基站终端切换成功, 释放 UE相关资源, 即指根据 UE的上下文 信息释放与该 UE相关的资源。 UE的上下文信息是包括承载信息, 或终端的 安全信息(如终端安全能力 [UE Security Capabilities] ,安全密钥 [Security Key] ), 或终端最大会与比特 UE Aggregate Maximum Bit Rate, 或终端在 X2接口上相 关的 ID (例如 Old eNB UE X2AP ID ) , 或终端在 SI接口上相关的 ID (例如, MME UE S1AP ID, eNB UE S1AP ID )等等。
根据本发明的一个实施例, 当 UE切换到目标基站之后, UE指示第一基 站该终端切换成功, 释放 UE相关资源。
当 UE切换到目标基站之后, UE可以自己通知切换前的源基站释放掉 UE 自己的上下文信息, 即根据 UE的上下文信息释放与 UE相关的资源 (无线或 控制面资源) 。
此外, 在 S220中的目标基站可以是一个目标基站, 也可以是多个目标基 站。
根据本发明的一个实施例,目标基站可以包括第一目标基站和第二目标基 站。 此时, S220 中的切换请求携带第一目标基站的基站标识和第二目标基站 的基站标识。
在该情况下, 当第一目标基站收到切换请求时, 第一目标基站基于第二目 标基站的基站标识与第二目标基站协商确定第一目标基站与第二目标基站各 自需要承担的 UE的承载。
由于 UE需要被切换到第一和第二目标基站, 因此第二基站可以分别向第 一目标基站和第二目标基站发送切换请求,并在切换请求中携带两者的基站标 识。 这样, 两个目标基站可以互相知道对方的存在, 并知道 UE需要切换到第 一和第二目标基站。
收到切换请求之后, 第一目标基站和第二目标基站进行协商,确定在切换 请求中携带的 UE的承载上下文信息反映的 UE的承载如何在两者之间进行分 配。 如果 UE的承载可以被第一目标基站和第二目标基站接受, 则 UE有可能 可以切换到第一目标基站和第二目标基站。如果两者协商不一致, 不能完全接 受 UE的承载, 则 UE不能切换到第一和第二目标基站。
根据本发明的一个实施例,第一目标基站可以基于第二目标基站的基站标 识与第二目标基站协商确定主站点。
可以有多种方式在第一和第二目标基站之间协商确定主站点。
例如,根据第一目标基站和第二目标基站接收切换请求的顺序, 第一目标 基站可以确定主站点。 举例来说, 第一目标基站是宏基站, 第二目标基站是中 继站, 则宏基站首先接收到切换请求, 那么宏基站是主站点。 也有可能第二目 标基站向第一目标基站发送收到切换请求的时间,第一目标基站将该时间与自 己的接收时间进行比较, 将首先收到切换请求的目标基站确定为主站点。
再例如, 根据预定配置, 第一目标基站可以确定主站点。 举例来说, 可以 始终将某种类型或某种配置的目标基站作为主站点,例如第一目标基站和第二 目标基站分别是宏基站和 RN的情况下, 将宏基站作为主站点。
还例如,根据第一目标基站和第二目标基站与 UE建立 RRC连接的顺序, 第一目标基站可以确定主站点。
又例如,根据切换请求携带第一目标基站的基站标识和第二目标基站的基 站标识的顺序, 第一目标基站可以确定主站点。 举例来说, 如果切换请求中携 带的第一目标基站的基站标识位于第二目标基站的基站标识之前,则确定第一 个目标基站是主站点。
又例如,根据第二目标基站响应于第一目标基站发送的请求确定主站点的 请求消息而返回的响应消息, 第一目标基站可以确定主站点。 举例来说, 第一 目标基站向第二目标基站发送请求消息,请求消息中携带第一目标基站的基站 标识, 以提议希望将自己确定为主站点。如果第二目标基站返回的响应消息同 意该提议, 则第一目标基站为主站点, 否则以第二目标基站为主站点。
根据本发明实施例提供的切换方法, 在第一基站也存在 RRC连接的情况 下,通过在切换请求中携带第一基站的基站标识,有利于目标基站基于该基站 标识与其交互, 并通知第一基站终端切换成功, 释放 UE相关资源。 在将 UE 切换到多个目标基站的情况下,通过携带多个目标基站的基站标识以使它们之 间可以协商确定承载的管理或者主站点,从而可以帮助顺利进行该场景下的切 换。
图 3是根据本发明实施例的切换方法 300的流程图。
如图 3所示, 方法 300包括: 在 S310中, 当需要对 UE进行切换时, 向 目标基站发送切换请求; 在 S320中, 收到目标基站返回的同意切换的切换响 应之后, 向为 UE提供服务的第一基站发送切换指示, 以指示第一基站向目标 基站进行数据转发; 在 S330中, 向 UE发送切换命令以指示 UE切换到目标 基站。
例如, 方法 300可以由第二基站执行。 第二基站和第一基站是 UE的源基 站,执行 UE切换的第二基站与 UE之间建立有 RRC连接, 第一基站与 UE之 间可以有、 也可以没有 RRC连接。 当进行切换时, 由于第一基站不知道要对 UE切换, 所以第二基站向第一基站发送切换指示, 以指示第一基站将 UE数 给目标基站, 从而可以在切换之后快速恢复 UE的当前业务, 增加用户的通信 体验。
根据本发明的实施例, 在第一基站与 UE建立有 RRC连接的情况下, 第 二基站发送的切换请求可以携带第一基站的基站标识,以向目标基站指示第一 基站与 UE建立有 RRC连接。 这样, 当 UE切换到目标基站之后, 目标基站 可以基于第一基站的基站标识向第一基站发送 UE上下文释放消息, 以指示第 一基站终端切换成功, 释放 UE相关资源。 除了由目标基站指示进行释放之外, 根据本发明的一个实施例, 当 UE切 换到目标基站之后, UE可以指示第一基站该终端切换成功, 释放 UE相关资 源。
根据本发明的实施例, 目标基站可以包括第一目标基站和第二目标基站, 此时, 切换请求携带第一目标基站的基站标识和第二目标基站的基站标识。
在该情况下, 当第一目标基站收到切换请求时, 第一目标基站基于第二目 标基站的基站标识与第二目标基站协商确定第一目标基站与第二目标基站各 自需要承担的 UE的承载。
另外,第一目标基站可以基于第二目标基站的基站标识与第二目标基站协 商确定主站点。 例如, 确定主站点时, 可以根据第一目标基站和所述第二目标 基站接收所述切换请求的顺序; 还可以根据预定配置; 也可以根据第一目标基 站和第二目标基站与 UE建立 RRC连接的顺序; 也可以根据切换请求携带第 一目标基站的基站标识和第二目标基站的基站标识的顺序;也可以根据第二目 标基站响应于第一目标基站发送的请求确定主站点的请求消息而返回的响应 消息。 当然, 本领域计算人员还可以想到其他确定主站点的方式。
根据本发明实施例提供的切换方法,通过向第一基站发送切换指示, 可使 第一基站进行数据转发,从而可以在使用多载波的情况下快速实现 UE的切换, 并快速恢复 UE的当前业务, 使得可以增加用户在切换过程中的通信体验。
下面,结合图 4至图 7描述利用根据本发明实施例的切换方法对 UE进行 切换的例子的消息交互图。
图 4是在第二基站需要经由第一基站接入核心网的情况下由第二基站将 UE切换到第三基站的消息交互图。 在该情况下, 第二基站可以是 RN、 也可 以是与 RN处于同一地位的家庭基站(Home eNB ) 、 小型基站 (Pico eNB ) 或其他类型的基站;第一基站可以是宏基站,例如 eNB、施主基站 DeNB( donor evolved NodeB )等。 因此, 本实施例中的基站是广义上的基站, 包括为 UE 提供服务的无线接入点, 如施主基站和中继站等。
下面以第二基站是 RN、 第一基站是 DeNB、 第三基站是 DeNB为例进行 描述。由于第二基站和第一基站是切换之前的源基站,因此用 S-RN和 S-DeNB 分别表示。 由于第三基站是目标基站, 因此用 T-DeNB表示。 另外第三基站还 可以是其他类型的基站。 在图 4中还示出了第三基站下的中继站 T-RN, 虽然 UE切换目标是第三基站,但是第三基站也可以将 UE的某些承载分配到 T-RN 上。
本领域技术人员可以容易想到该消息交互图也适用于该场景下其他类型 的基站。
在图 4所示的例子中,UE与 S-RN(源中继站)之间有 RRC连接,与 S-DeNB
(源基站 )之间可以有、 也可以没有 RRC连接。 UE使用 S-RN和 S-DeNB的 载波进行通信。 S-RN是 Anchor (锚点)基站。
在 S410中, UE向 S-RN发送测量报告, 在测量报告中携带 UE在 S-RN 和 /或 S-DeNB下的小区的测量值。
在 S420中, S-RN基于测量报告作出切换决定。
在 S430中, S-RN从 S-DeNB获取 UE在 S-DeNB上的承载上下文信息。 例如, S-DeNB更新 UE的承载上下文信息时通知 S-RN, 或者 S-DeNB收到 S-RN请求时将 UE的承载上下文信息通知 S-RN,或者 S-DeNB在也可以收到 测量报告的情况下根据测量报告结果来向 S-RN发送 UE的承载上下文信息。
在 S440中, S-RN将 UE在 S-RN上的承载上下文信息和在 S430中获取 的承载上下文信息携带在切换请求中发送给 T-DeNB (即目标基站) , 并与 T-DeNB进行切换协商过程。该过程可以重用 LTE R10中的切换协商流程。 另 夕卜, 如果 S-DeNB与 UE之间也有 RRC连接, S-RN发送的切换请求中还可以 携带 S-DeNB的基站标识。
在 S450中, 当 S-RN收到 T-DeNB同意切换的切换响应时, 向 UE发送 切换命令。
由于 S-RN收到的切换响应是由 S-DeNB转发的, 所以 S-DeNB也收到了 切换响应, 并将 S-DeNB上的 UE数据转发给 T-DeNB。 如果 T-DeNB还希望 第四基站也为 UE提供数据服务的话(例如在第三基站是 T-DeNB的情况下, 第四基站是 T-RN ) , T-DeNB将数据再转发给第四基站。
此外, S-RN在收到切换响应时, 也会将 S-RN上的 UE数据转发给第三 基站。 由于数据转发的操作与相关技术相同, 因此不再作详细描述。
在 S460中, UE执行 RACH (随机接入信道)接入过程以切换到第三基 站。
当 UE切换到第三基站之后,如果 UE与 S-DeNB之间有 RRC连接,则第 三基站可以基于 S-DeNB的基站标识指示 S-DeNB释放掉相关资源。另夕卜, UE 也可以在切换到第三基站之后, 主动要求 S-DeNB释放掉自己的相关资源。
图 5 是在第二基站需要经由第一基站接入核心网的情况下由第一基站将 UE切换到第三基站和第四基站的消息交互图。 在例子中, 仍假设第二基站是 S-RN, 第一基站是 S-DeNB。 第三基站和第四基站都是目标基站, 可以是任何 类型的基站, 在此处假设第三基站是 T-DeNB, 第四基站是 T-RN。
在图 5的例子中, UE与 S-DeNB之间建立有 RRC连接, 与 S-RN之间可 以有、 也可以没有 RRC连接, UE使用 S-DeNB和 S-RN的载波进行通信, 并 且 S-DeNB是 Anchor基站。
在 S510中, UE向 S-DeNB发送测量报告,在测量报告中携带 UE在 S-RN 和 /或 S-DeNB下的小区的测量值。
在 S520中, S-DeNB基于测量报告作出切换决定。
由于 S-DeNB知道 UE在 S-RN和 S-DeNB上所有承载上下文信息, 所以 无需如图 4中那样需要获取 UE在 S-RN上的承载上下文信息。
在 S530中, S-DeNB需要将 UE切换到 T-RN (目标中继站)和 T-DeNB, 由于 T-RN是 T-DeNB的中继站,所以 S-DeNB可以只将切换请求(携带 T-RN 和 T-DeNB的基站标识 )发送给 T-DeNB, 再由 T-DeNB基于切换请求携带的 T-RN 的基站标识, 将切换请求转发给 T-RN。 当然, S-DeNB 也可以分别向 T-RN和 T-DeNB发送切换请求。 在切换请求中携带 T-RN和 T-DeNB的基站 标识, 还携带 UE在 S-DeNB和 S-RN上的承载上下文信息。
这样, T-RN和 T-DeNB可以协商确定如何分配 UE的承载, 并确定是否 接受 UE的切换。 T-RN和 T-DeNB还可以协商谁为主站点。 另夕卜, 如果 UE 和 S-RN之间也存在 RRC连接,则在切换请求中还可以携带 S-RN的基站标识, 以使目标基站知道 S-RN的存在,可以在切换之后指示 S-RN释放掉相关资源。
在 S540中, T-RN和 T-DeNB中的主站点向 S-DeNB返回同意切换的切换 响应, 在切换响应中可以携带 T-RN和 T-DeNB各自承担的 UE承载。 当然, 本领域技术人员也可以想到,也可以两者都向 S-DeNB返回切换响应。 S-DeNB 收到切换响应之后, 向 T-RN和 T-DeNB进行数据转发。
在 S550中, S-DeNB向 S-RN发送切换指示, 以指示 S-RN向 T-RN和 T-DeNB进行数据转发, 即将緩存的 UE承载上的数据转发给目标基站, 以实 现对 UE当前业务的快速恢复。
在 S560中, S-DeNB向 UE发送切换命令。 该步骤也可以在 S550之前执 行, 或者与在 S550并发执行。
在 S570中, UE执行 RACH过程, 例如可以并行执行与 T-DeNB和 T-RN 的 RRC连接建立。
图 6是在第一基站和第二基站相互独立的情况下由第二基站将 UE切换到 第三基站的消息交互图。第一基站和第二基站相互独立表示第一基站和第二基 站不需要经过对方就可以接入核心网。例如,第一基站和第二基站可以是 Home eNB、 Pico eNB、 DeNB、 RN和其他类型基站中的一种, 两者的类型可以相同 也可以不同。 在该例子中, UE与第二基站之间有 RRC连接, 与第一基站之间可以有、 也可以没有 RRC连接。 UE同时使用第一基站和第二基站的载波进行通行,并 且第二基站是 Anchor (锚点)基站。
在 S610中, UE向第二基站发送测量报告, 在测量报告中携带 UE在第二 基站和 /或第一基站的覆盖下测量得到的报告值。
在 S620中 , 第二基站基于测量报告作出切换决定。
在 S630中, 第二基站从第一基站获取 UE的承载上下文信息。
在 S640中, 第二基站向第三基站发送切换请求, 在其中携带 UE在第一 和第二基站上所有的承载上下文信息, 并与第三基站进行切换协商过程。该过 程可以重用 LTE R10中的切换协商流程。 当第三基站同意切换时, 向第二基 站返回同意切换的切换响应, 第二基站基于切换响应向第三基站进行数据转 发。
在 S650中, 当第二基站收到第三基站同意切换的切换响应时, 第二基站 向第一基站发送切换指示, 以使第一基站基于该切换指示将 UE数据转发给第 三基站。
在 S660中, 第二基站向 UE发送切换命令。 发送切换命令也可以在发送 切换指示之前执行, 或并发执行。
在 S670中, UE执行 RACH接入过程以切换到第三基站。
图 7是在第一基站和第二基站相互独立的情况下由第二基站将 UE切换到 第三基站和第四基站的消息交互图。 在该例子中, 需要将 UE切换到两个目标 基站。 第三基站和第四基站可以是 Home eNB、 Pico eNB、 DeNB、 RN和其他 类型基站中的一种,第三基站和第四基站之间是否需要经由对方接入核心网没 有限制。
在该例子中, UE与第二基站之间建立有 RRC连接,与第一基站之间可以 有、 也可以没有 RRC连接, UE使用第一基站和第二基站的载波进行通信, 并 且第二基站是 Anchor基站。
S710、 S720和 S730与 S610、 S620和 S630基本相同。
在 S740中, 第二基站分别向第三基站和第四基站发送切换请求。 在切换 请求中携带第三基站和第四基站的基站标识,还携带 UE在第一基站和第二基 站上的承载上下文信息。 这样, 第三基站和第四基站可以协商确定如何分配 UE的承载, 当两者可以接受 UE的承载时, 可以进行 UE的切换。 第三基站 和第四基站还可以协商谁为主站点。
在 S750中, 第三基站和 /或第四基站中的主站点(例如第三基站)向第二 基站返回同意切换的切换响应。 当然, 本领域技术人员也可以想到, 也可以两 者都向第二基站返回切换响应。
在 S760中, 第二基站向第一基站发送切换指示, 以指示第一基站向第三 基站和第四基站进行数据转发。 当然, 第二基站在收到切换响应时也会向第三 基站和第四基站进行数据转发。
在 S770中, 第二基站向 UE发送切换命令。 S760和 S770可以并发执行, S760也可以在 S770之后执行。
在 S780中, UE执行 RACH过程, 例如可以并行执行与第三基站和第四 基站的 RRC连接建立。
图 8是根据本发明实施例的切换方法 800的流程图。
如图 8所示, 方法 800包括: 在 S810中, 当需要对 UE进行切换时, 向 为 UE提供服务的第一基站发送切换请求, 以使第一基站将 UE在第一基站上 的承载上下文信息添加到切换请求中并向目标基站转发; 在 S820中, 收到第 一基站发送的目标基站返回的同意切换的切换响应之后, 向 UE发送切换命令 以使 UE切换到目标基站。
例如, 方法 800可以由第二基站执行。 第一基站和第二基站是切换之前为 UE提供服务的源基站, 进行 UE切换的第二基站与 UE之间有 RRC连接, 第 一基站与 UE之间可以有、 也可以没有 RRC连接, 第二基站是 Anchor基站。 第二基站需要经由第一基站才能接入核心网,即第二基站向网络侧发送的数据 需要经由第一基站转发, 例如第二基站可以是 RN, 第一基站可以是 DeNB。
在 S810中, 当第二基站根据 UE的测量报告确定对 UE进行切换时, 向 目标基站发送切换请求。由于第二基站向网络侧发送的消息需要经由第一基站 发送, 所以第一基站会接收到切换请求。 当第一基站收到切换请求时, 第一基 站将 UE在其上的承载上下文信息主动添加到切换请求中, 然后再向目标基站 转发。 这样, 目标基站可以从切换请求中获取 UE在第一和第二基站上的所有 承载上下文信息, 进而可以确定是否接受 UE的切换。
在 S820中, 当目标基站同意对 UE切换时, 于是, 目标基站向第一基站 返回同意切换的切换请求, 第一基站命令 UE进行切换。
根据本发明实施例提供的切换方法, 当 UE切换之前使用载波汇聚而与第 一基站和第二基站都建立有数据连接时,进行切换的第二基站即便不获取第一 基站上 UE的承载上下文信息, 也可以实现将 UE切换到目标基站。 此时, 需 要由第一基站在收到的切换请求中添加承载上下文信息,以使目标基站可以基 于所有承载上下文信息来帮助确定是否接受切换,从而可以顺利实现将载波汇 聚状态下的 UE切换到新的基站, 并可以快速恢复 UE的当前业务, 提高用户 通信体验。
图 9是根据本发明实施例的切换方法 900的流程图。 方法 900与方法 800 的技术方案基本相同, 只是从不同的执行主体进行了描述。
如图 9所示, 方法 900包括: 在 S910中, 接收第一基站针对需要切换的 UE发送的切换请求; 在 S920中, 将 UE在第二基站上的承载上下文信息添加 到所接收的切换请求中, 并向目标基站发送该切换请求,承载上下文信息用于 目标基站确定是否接受 UE切换; 在 S930中, 向第一基站发送目标基站返回 的同意切换的切换响应, 以指示第一基站基于切换响应向 UE发送切换命令, 切换命令用于指示 UE切换到目标基站。
例如, 方法 900可以由第二基站执行。 第二基站与第一基站是 UE的源基 站, 进行 UE切换的第一基站与 UE之间有 RRC连接, 第二基站与 UE之间可 以有、 也可以没有 RRC连接, 第一基站是 Anchor基站。 第一基站经由第二基 站才能接入核心网。 例如, 第一基站可以是 RN, 第二基站可以是 DeNB。
在 S910中, 第一基站基于 UE上报的测量报告确定需要对 UE进行切换, 并发送切换请求。
在 S920中, 由于第一基站向网络侧发送的消息需要经由第二基站, 所以 第二基站会收到 UE发出的切换请求。 在收到切换请求时, 第二基站将 UE在 第二基站上的承载上下文信息添加到切换请求中。之后,再将添加有第二基站 上的承载上下文信息的切换请求向目标基站转发。
在 S930中, 如果目标基站同意接受切换, 则发送同意切换的切换响应。 第二基站在收到该切换响应之后向第一基站转发。 由第一基站命令 UE进行切 换。
根据本发明实施例提供的切换方法, 当 UE切换之前使用载波汇聚而与第 一基站和第二基站都建立有数据连接时,进行切换的第一基站即便不获取第二 基站上 UE的承载上下文信息, 也可以实现将 UE切换到目标基站。 此时, 需 要由第二基站在收到的切换请求中添加承载上下文信息,以使目标基站可以基 于所有承载上下文信息来帮助确定是否接受切换,从而可以顺利实现将载波汇 聚状态下的 UE切换到新的基站, 并可以快速恢复 UE的当前业务, 提高用户 通信体验。
根据本发明的一个实施例,目标基站可以包括第一目标基站和第二目标基 站, 此时,切换请求需要携带第一目标基站的基站标识和第二目标基站的基站 标识。
在该情况下, 当第一目标基站收到切换请求时, 第一目标基站基于第二目 标基站的基站标识与第二目标基站协商确定第一目标基站与第二目标基站各 自需要承担的 UE的承载。
当第一目标基站和第二目标基站协商确定各自承担的 UE的承载之后,有 可能可以将 UE切换到第一目标基站和第二目标基站。
根据本发明的一个实施例,第一目标基站可以基于第二目标基站的基站标 识与第二目标基站协商确定主站点。
可以有多种方法来确定主站点。例如,可以根据第一目标基站和第二目标 基站接收切换请求的顺序, 来确定主站点。 再例如, 可以根据预定配置来确定 主站点。 又例如, 可以根据第一目标基站和第二目标基站与 UE建立 RRC连 接的顺序, 来确定主站点。 又例如, 可以根据切换请求携带第一目标基站的基 站标识和第二目标基站的基站标识的顺序, 来确定主站点。 又例如, 可以根据 第二目标基站响应于第一目标基站发送的请求确定主站点的请求消息而返回 的响应消息, 来确定主站点。 相关内容的描述可以参考上文中的叙述, 为了避 免重复, 在此不再赘述。
接下来结合图 10和图 11来描述方法 800和方法 900的例子。
图 10是在第二基站需要经由第一基站接入核心网的情况下由第二基站将 UE切换到第三基站的消息交互图。 在该例子中, 第二基站是 RN, 第一基站 是 DeNB, 由于是源基站, 所以也可以表示为 S-RN和 S-DeNB; 第三基站是 DeNB, 由于是目标基站, 所以也可以表示为 T-DeNB。 当然, 本领域技术人 员也可以容易地想到, 第一、 第二和第三基站也可以是其它类型的基站, 该例 子描述的消息交互也可以应用到其它类似的网络架构中。
在图 10的例子中, UE与 S-RN之间维护一个独立的 RRC连接, UE与 S-DeNB之间可以有 RRC连接、 也可以没有 RRC连接。 由 S-RN控制 UE, RN是 Anchor基站。
在 S1010中, UE向 S-RN发送测量报告, 在测量报告中携带 UE在 S-RN 和 /或 S-DeNB下的小区的测量值。
在 S1020中, S-RN基于测量报告作出切换决定。
在 S1030 中, S-RN 向 T-DeNB 发送切换请求, 该切换请求需要经由 S-DeNB。
在 S1040中, S-DeNB将 UE在 S-DeNB上的承载上下文信息添加到切换 请求中, 并将添加后得到的切换请求向 T-DeNB转发。
在 S1050中, T-DeNB同意 UE的切换之后, 向 S-RN返回切换响应, 该 切换响应首先到达 S-DeNB。 由于 S-DeNB收到了该同意切换的切换响应, 所 以 S-DeNB可以如相关技术那样将数据转发给 T-DeNB。 T-DeNB如果希望它 的 RN也可以负担 UE的部分承载,则还可以将数据再转发给它的 RN(用 T-RN 表示) 。
在 S1060中, S-DeNB将该切换响应转发给 S-RN。 S-RN也可以如相关技 术那样将数据转发给 T-DeNB。 T-DeNB还可以将数据再转发给 T-RN。
在 S1070中, S-RN向 UE发送切换命令。
在 S1080中, UE执行 RACH接入过程切换到 T-DeNB。
当 UE切换到 T-DeNB之后, 如果 UE之间与 S-DeNB之间有 RRC连接, 则 T-DeNB可以基于 S-DeNB的基站标识指示 S-DeNB释放掉相关资源。另夕卜, UE也可以在切换到 T-DeNB之后, 主动要求 S-DeNB释放掉自己的上下文信 图 11是在第二基站需要经由第一基站接入核心网的情况下由第二基站将
UE切换到第三基站和第四基站的消息交互图。 在该例子中, 第一基站和第二 基站仍然分别是 S-DeNB和 S-RN; 第三基站和第四基站都是目标基站, 可以 是任何类型的基站, 在此处假设第三基站是 eNB , 第四基站是 Pico eNB。
在图 11中, UE与 S-RN之间存在 RRC连接, UE与 S-DeNB之间可以存 在、 也可以不存在 RRC连接, S-RN是 Anchor基站。 在 S1110中, UE向 S-RN发送测量报告, 在测量报告中携带 UE在 S-RN 和 /或 S-DeNB下的小区的测量值。
在 S 1120中, S-RN基于测量报告作出切换决定。
在 S1130中, S-RN分别向 eNB和 Pico eNB发送切换请求, 切换请求都 需要经由 S-DeNB。 在切换请求中需要携带 eNB和 Pico eNB的基站标识, 在 S1140中, S-DeNB将 UE在 S-DeNB上的承载上下文信息分别都添加 到切换请求中, 并将添加后得到的切换请求向 eNB和 Pico eNB转发。
在 S1150中, eNB和 Pico eNB收到切换请求之后, 可以根据对方的基站 标识协商确定如何分配 UE在 S-RN和 S-DeNB上的承载。 如果两者可以接受 UE的切换,则意味着两者有可能可以接受 UE的切换。此外, eNB和 Pico eNB 还可以协商谁为主站点。
在 S1160中, eNB和 Pico eNB中的主站点 (假设为 Pico eNB ) 向 S-RN 返回同意切换的切换响应, 在切换响应中可以携带 eNB和 Pico eNB各自承担 的 UE承载。 当然, 本领域技术人员也可以想到, 也可以两者都向 S-RN返回 切换响应。切换响应首先到达 S-DeNB , S-DeNB向 eNB和 Pico eNB进行数据 转发。
在 S1170中, S-DeNB向 S-RN转发切换响应, S-RN向 eNB和 Pico eNB 进行数据转发。
在 S1180中, S-RN命令 UE进行切换。
在 S 1190中, UE执行 RACH接入过程,例如可以并行执行 eNB和 Pico eNB 的 RRC连接建立。
图 12是根据本发明实施例的切换方法 1200的流程图。
如图 12所示, 方法 1200包括: 在 S1210中, 当需要对 UE进行切换时, 向第一目标基站和第二目标基站发送切换请求,切换请求携带 UE的承载上下 文信息、第一目标基站的基站标识和第二目标基站的基站标识, 以使第一目标 基站基于第二目标基站的基站标识与第二目标基站协商确定各自需要承担的 与承载上下文信息相关的承载; 在 S1220中, 当收到第一目标基站和第二目标 基站返回的同意切换的切换响应之后, 向 UE发送切换命令以指示 UE切换到 第一目标基站和第二目标基站。
例如, 方法 1200可以由 UE的源基站执行, 由源基站对 UE进行切换。 不管 UE在切换之前是否使用了载波汇聚技术, 在切换之后, UE需要与两个 目标基站建立连接。
在 S1210中, 源基站分别向第一和第二目标基站发送切换请求,切换请求 中携带 UE在源基站上的承载上下文信息, 如果不仅需要改变 UE在源基站上 的承载, 还需要改变 UE在另一为它提供服务的源基站上的承载, 则切换请求 中携带 UE在这两个源基站上的承载上下文信息。
另外,在切换请求中还需要携带第一和第二目标基站的基站标识, 这样它 们才能相互意识到对方的存在, 并基于对方的基站标识与对方交互,从而实现 UE的切换。
在第一目标基站和第二目标基站之间可以确定 UE的承载如何在两者之间 进行分配。如果需要切换的承载都可以被两个目标基站接受, 则有可能两个目 标基站可以接受 UE的切换。 当两个目标基站同意 UE的切换时, 可以向源基 站返回同意切换的切换响应。 在切换响应中可以携带 UE承载的分配结果。
在 S1220中, 源基站在收到同意切换的切换响应之后,分别向第一目标基 站和第二目标基站进行数据转发, 以使得可以快速恢复 UE的当前业务, 并向 UE发送切换命令以使 UE切换到第一目标基站和第二目标基站。
根据本发明实施例提供的切换方法,通过在切换请求中携带第一目标基站 和第二目标基站的基站标识, 可以使两个目标基站基于该基站标识协商确定 UE承载的负担, 从而可以实现将 UE切换到两个目标基站, 并可以快速恢复 UE的当前业务, 增强用户的通信体验。 图 13是根据本发明实施例的切换方法 1300的流程图, 方法 1300与方法 1200的技术方案基本相同, 但是执行主体不同。
如图 13所示, 方法 1300包括: 在 S1310中, 接收源基站针对需要切换的 UE发送的切换请求, 切换请求携带 UE的承载上下文信息和第一目标基站的 基站标识;在 S1320中,基于第一目标基站的基站标识与第一目标基站协商确 定各自需要承担的与承载上下文信息相关的承载;在 S1330中,当协商成功时, 向源基站返回同意切换的切换响应。
例如, 方法 1300可以由第二目标基站执行。 第一目标基站和第二目标基 站是需要将 UE切换到的目标基站, UE 需要与第一和第二目标基站都建立 RRC连接。 S1310至 S1330的相关内容可以参考 S1210和 S1220的描述。
根据本发明的一个实施例,第二目标基站还可以基于第一目标基站的基站 标识与第一目标基站确定主站点。
可以通过多种方式来确定主站点。例如,根据第一目标基站和第二目标基 站接收切换请求的顺序,第二目标基站可以确定在第一和第二目标基站之间确 定主站点。 在例如, 根据预定配置, 第二目标基站可以确定主站点。 又例如, 根据第一目标基站和第二目标基站与 UE建立 RRC连接的顺序, 第二目标基 站可以在两者之间确定主站点。 又例如,根据切换请求携带第一目标基站的基 站标识和第二目标基站的基站标识的顺序,第二目标基站可以在两者之间确定 主站点。 又例如,根据第一目标基站响应于第二目标基站向第一目标基站发送 的请求确定主站点的请求消息而返回的响应消息。第二目标基站可以在两者之 间确定主站点。 相关内容可以参考上述方法 200中的相关描述。
将 UE切换到第一目标基站和第二目标基站的相关操作的例子可以参考上 述图 5、 图 7、 图 11的相关描述。
根据本发明实施例提供的切换方法,通过在切换请求中携带第一目标基站 和第二目标基站的基站标识, 可以使两个目标基站基于该基站标识协商确定 UE承载的负担, 从而可以实现将 UE切换到两个目标基站, 并可以快速恢复 UE的当前业务, 增强用户的通信体验。
图 14是根据本发明实施例的切换方法 1400的流程图。
如图 14所示, 方法 1400包括: 在 S1410中, 在 UE与第一基站和第二基 站分别建立有 RRC连接的情况下, 当需要将 UE从第二基站切换到目标基站 时, 向目标基站发送携带第一基站的基站标识的切换请求, 以使目标基站基于 第一基站的基站标识与第一基站进行交互;在 S1420中,收到目标基站返回的 同意切换的切换响应之后, 向 UE发送切换命令以指示 UE切换到目标基站。
例如, 方法 1400可以由第二基站执行, 第一基站和第二基站是源基站。 第一基站和第二基站都与 UE建立有 RRC连接,并且第二基站是 Anchor基站。 此时进行的切换是将 UE从第二基站切换到目标基站, 目标基站可以是一个, 也可以是多个, 但是 UE与第一基站的 RRC连接保持不变。
在 S1410中, 第二基站发送切换请求, 需要携带 UE在第二基站上的承载 上下文信息以使目标基站接受 UE在第二基站上的承载。 重要的是, 需要在切 换请求中携带第一基站的基站标识, 这样, 目标基站可以通过该标识找到第一 基站, 进而与第一基站进行交互, 以更好地为 UE提供服务。
在 S1420中,如果目标基站同意切换,则第二基站将 UE切换到目标基站。 切换后的 UE与第一基站和目标基站之间都维持有 RRC连接, 目标基站可以 通过第一基站的基站标识与第一基站进行通信或交互。
目标基站与第一基站的交互可以发生在切换完成之前,也可以发生在切换 完成之后。 例如, 目标基站可以基于第一基站的基站标识与第一基站协商 UE 承载是否需要转移。 举例来说, 假设 UE在第一基站上具有 4个承载、 切换后 将在目标基站上具有 8个承载, 则目标基站可以与第一基站协商是否可以将 8 个承载中的两个转移到第一基站上。
再例如, 当 UE接收第一基站和目标基站提供的服务时, 如果目标基站决 定为 UE再进行切换, 则目标基站可以基于第一基站的基站标识来将 UE从这 两个源基站(即目标基站和第一基站)切换到到新的基站。 举例来说, 如上文 所述, 目标基站可以基于第一基站的基站标识从第一基站获取 UE的承载上下 文信息、 向第一基站发送切换指示等。
根据本发明实施例提供的切换方法, 当需要对具有两个 RRC连接的 UE 切换一个 RRC连接时,通过在切换请求中携带保持 RRC连接不变的源基站的 基站标识, 可以使目标基站快速发现该源基站并与之进行交互,从而实现两者 更好地配合来为 UE进行服务, 使得可以减小切换对用户通信体验的影响。
图 15是根据本发明实施例的切换方法 1500的流程图。 方法 1500与方法 1400基本相同, 但具有不同的执行主体。
如图 15所示, 方法 1500包括: 在 S1510中, 在 UE与第一基站和第二基 站分别建立有 RRC连接的情况下, 当需要将 UE从第二基站切换到目标基站 时, 接收第二基站发送的携带第一基站的基站标识的切换请求; 在 1520中, 基于基站标识与第一基站进行交互;在 S1530中, 当基于切换请求确定同意切 换时, 与第二基站完成 UE的切换。
例如, 方法 1500可以由目标基站执行。 S1510至 S1530的相关操作可以 参考上述方法 1400中的 S1410和 S1420, 为了避免重复, 在此不再赘述。 虽 然在 S1530之前执行 S1520, 但是 S1520也可以在 S1530之后执行。
根据本发明实施例提供的切换方法, 当需要对具有两个 RRC连接的 UE 切换一个 RRC连接时,通过在切换请求中携带保持 RRC连接不变的源基站的 基站标识, 可以使目标基站快速发现该源基站并与之进行交互,从而实现两者 更好地配合来为 UE进行服务, 使得可以减小切换对用户通信体验的影响。
图 16是在第一基站和第二基站都与 UE建立有 RRC连接的情况下由第二 基站将 UE切换到目标基站而保留第一基站与 UE的 RRC连接的消息交互图。
在该例子中, 第一基站和第二基站可以是任何类型的基站, 第一基站和第 二基站之间可以相互独立,也可以是一方需要经由另一方才能接入核心网。 第 一基站和第二基站与 UE之间都建立有 RRC连接, 第二基站是 Anchor基站。
在 S1610中, UE向第二基站发送测量报告, 在测量报告中可以携带 UE 在第一基站和 /或第二基站下的小区的测量值。
在 S1620中, 第二基站基于测量报告作出切换决定。
在 S1630中, 在第二基站确定需要对 UE进行切换、 但并不改变 UE与第 一基站的 RRC连接的情况下, 第二基站向目标基站发送切换请求, 切换请求 中携带 UE在第二基站上承载的上下文信息。 更重要的是, 切换请求中携带第 一基站的基站标识, 以向目标基站指明第一基站的存在。 虽然在图 16中只示 出了一个目标基站,但是目标基站也可以具有多个, 本领域技术人员在上文描 述的启发下可以容易地想到如何实现,例如在切换请求中携带第一目标基站和 第二目标基站的基站标识, 以使两者协商确定如何对 UE的承载进行分配。
在 1640中, 当目标基站同意切换时, 第二基站接收目标基站同意切换的 切换响应, 并将 UE数据转发给目标基站。
在 S1650中, 第二基站向 UE发送切换命令。
在 S1660中, UE切换到目标基站。
由于在切换请求中携带有第一基站的基站标识,所以目标基站可以在切换 完成之前和 /或之后, 与第一基站进行交互, 以更好地为 UE提供服务。
上面描述了根据本发明实施例的切换方法,下面将结合图 17至图 26描述 根据本发明实施例的基站。
图 17是根据本发明实施例的基站 1700的结构框图。
基站 1700包括获取模块 1710、第一发送模块 1720和第二发送模块 1730, 可以分别用不同的处理器单元来实现。 获耳 ^莫块 1710可用于当需要对用户设 备 UE进行切换时, 获取 UE在第一基站上的承载上下文信息, 第一基站为 UE的源基站。第一发送模块 1720可用于向目标基站发送切换请求,切换请求 携带承载上下文信息, 承载上下文信息用于目标基站确定是否接受 UE切换。 第二发送模块 1730可用于收到目标基站返回的同意切换的切换响应之后, 向 UE发送切换命令以指示 UE切换到目标基站。
获取模块 1710、 第一发送模块 1720和第二发送模块 1730的上述和其他 操作和 /或功能可以参考上述方法 100 中的相关内容, 为了避免重复, 在此不 再重复。
根据本发明实施例提供的基站, 当 UE在切换之前使用载波汇聚时, 该基 站通过获取 UE在第一基站上的承载上下文信息,可以使目标基站基于第一基 站和第二基站上的所有承载来帮助确定是否同意 UE的切换,这样在目标基站 同意切换的情况下, 可以将 UE从第一基站和第二基站切换到目标基站, 从而 使正在使用载波聚合的 UE得到快速切换处理,从而可以增加用户在切换过程 中的通信体验。
图 18是根据本发明实施例的基站 1800的结构框图。 基站 1800中的获取 模块 1810、 第一发送模块 1820和第二发送模块 1830与基站 1700中的获取模 块 1710、 第一发送模块 1720和第二发送模块 1730基本相同。
根据本发明的一个实施例, 基站 1800还可以包括第三发送模块 1840, 可 以由处理器单元来实现。第三发送模块 1840可用于向第一基站发送切换指示, 以指示第一基站向目标基站进行数据转发。
根据本发明的一个实施例, 获取模块 1810可以包括第一接收单元 1812。 第一接收单元 1812可用于接收第一基站更新承载上下文信息时发送的承载上 下文信息。
根据本发明的一个实施例,获取模块 1810可以包括请求单元 1814和第二 接收单元 1816。 请求单元 1814可用于向第一基站请求承载上下文信息。 第二 接收单元 1816可用于接收第一基站返回的承载上下文信息。
根据本发明的一个实施例, 获取模块 1810可以包括第三接收单元 1818。 第三接收单元 1818 可用于接收第一基站基于测量报告发送的承载上下文信 第三发送模块 1840、 第一接收单元 1812、 请求单元 1814、 第二接收单元 1816和第三接收单元 1818的上述和其他操作和 /或功能可以参考上述方法 100 和方法 200中的相关内容, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的基站,通过向不知道需要进行切换的第一基站发 送切换指示, 可以使第一基站向目标基站进行数据转发, 从而有利于在切换 UE之后快速恢复 UE的当前业务, 从而提高用户的通信体验。
图 19是根据本发明实施例的基站 1900的结构框图。
基站 1900包括第一发送模块 1910、 第二发送模块 1920和第三发送模块
1930, 可以分别由处理器单元来实现。 第一发送模块 1910可用于当需要对用 户设备 UE进行切换时, 向目标基站发送切换请求。 第二发送模块 1920可用 于收到目标基站返回的同意切换的切换响应之后, 向为 UE提供服务的第一基 站发送切换指示, 以指示第一基站向目标基站进行数据转发。 第三发送模块 1930可用于向 UE发送切换命令以指示 UE切换到目标基站。
第一发送模块 1910、 第二发送模块 1920和第三发送模块 1930的上述和 其他操作和 /或功能可以参考上述方法 300 中的相关内容, 为了避免重复, 在 此不再赘述。
根据本发明实施例提供的基站, 当需要进行切换时, 该基站通过向不知道 要进行切换的第一基站发送切换指示,可以指示第一基站将其上的 UE数据转 发给目标基站, 从而可以在切换之后快速恢复 UE的当前业务, 增加用户的通 信体验。
图 20是根据本发明实施例的基站 2000的结构框图。
基站 2000可以包括发送模块 2010和接收模块 2020, 可以分别是处理器 单元。 发送模块 2010可用于当需要对用户设备 UE进行切换时, 向为 UE提 供服务的第一基站发送切换请求, 以使第一基站将 UE在第一基站上的承载上 下文信息添加到切换请求中并向目标基站转发,承载上下文信息用于目标基站 确定是否接受 UE切换。 接收模块 2020可用于收到第一基站发送的目标基站 返回的同意切换的切换响应之后, 向 UE发送切换命令以指示 UE切换到目标 基站。
发送模块 2010和接收模块 2020的上述和其他操作和 /或功能可以参考上 述方法 800中的相关内容, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的基站, 当 UE切换之前使用载波汇聚而与该基站 和第一基站都建立有数据连接时, 进行切换的该基站即便不获取第一基站上 UE的承载上下文信息, 也可以实现将 UE切换到目标基站。 此时, 需要由第 一基站在收到的切换请求中添加承载上下文信息,以使目标基站可以基于所有 承载上下文信息来帮助确定是否接受 UE切换,从而可以顺利实现将载波汇聚 状态下的 UE切换到新的基站, 并可以快速恢复 UE的当前业务, 提高用户通 信体验。
图 21是根据本发明实施例的基站 2100的结构框图。
基站 2100可以包括接收模块 2110、 添加模块 2120和发送模块 2130, 可 以分别是不同的处理器单元。 接收模块 2110可用于接收第一基站针对需要切 换的用户设备 UE发送的切换请求。 添加模块 2120可用于将 UE在基站上的 承载上下文信息添加到所接收的切换请求中, 并向目标基站发送该切换请求, 承载上下文信息用于目标基站确定是否接受 UE切换。 发送模块 2130可用于 向第一基站发送目标基站返回的同意切换的切换响应,以指示第一基站基于切 换响应向 UE发送切换命令, 切换命令用于指示 UE切换到目标基站。
接收模块 2110、 添加模块 2120和发送模块 2130的上述和其他操作和 /或 功能可以参考上述方法 900中的相关内容, 为了避免重复, 不再赘述。
根据本发明实施例提供的基站, 当 UE切换之前使用载波汇聚而与该基站 和第一基站都建立有数据连接时, 进行切换的第一基站即便不获取该基站上 UE的承载上下文信息, 也可以实现将 UE切换到目标基站。 此时, 需要由该 基站在收到的切换请求中添加承载上下文信息,以使目标基站可以基于所有承 载上下文信息来帮助确定是否接受切换,从而可以顺利实现将载波汇聚状态下 的 UE切换到新的基站,并可以快速恢复 UE的当前业务,提高用户通信体验。
图 22是根据本发明实施例的基站 2200的结构框图。
基站 2200可以包括第一发送模块 2210和第二发送模块 2220, 可以分别 是处理器单元。第一发送模块 2210可用于当需要对用户设备 UE进行切换时, 向第一目标基站和第二目标基站发送切换请求,切换请求携带 UE的承载上下 文信息、第一目标基站的基站标识和第二目标基站的基站标识, 以使第一目标 基站基于第二目标基站的基站标识与第二目标基站协商确定第一目标基站和 第二目标基站各自需要承担的与承载上下文信息相关的承载,承载上下文信息 用于第一目标基站和第二目标基站确定是否接受 UE切换。第二发送模块 2220 可用于当收到第一目标基站和第二目标基站返回的同意切换的切换响应之后, 向 UE发送切换命令以指示 UE切换到第一目标基站和第二目标基站。
第一发送模块 2210和第二发送模块 2220的上述和其他操作和 /或功能可 以参考上述方法 1200中的相关内容, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的基站,通过在切换请求中携带第一目标基站和第 二目标基站的基站标识,可以使两个目标基站基于该基站标识协商确定 UE承 载的负担, 从而有利于实现将 UE切换到两个目标基站, 并可以快速恢复 UE 的当前业务, 增强用户的通信体验。
图 23是根据本发明实施例的基站 2300的结构框图。
基站 2300包括接收模块 2310、 第一确定模块 2320和发送模块 2330, 可 以分别是处理器单元。 接收模块 2310可用于接收源基站针对需要切换的用户 设备 UE发送的切换请求, 切换请求携带 UE的承载上下文信息和第一目标基 站的基站标识。 第一确定模块 2320可用于基于第一目标基站的基站标识与第 一目标基站协商确定各自需要承担的与承载上下文信息相关的承载。发送模块 2330 可用于当协商成功时, 向源基站返回同意切换的切换响应, 以使源基站 基于切换响应向 UE发送切换命令以完成切换。
接收模块 2310、 第一确定模块 2320和发送模块 2330的上述和其他操作 和 /或功能可以参考上述方法 1300中的相关内容, 为了避免重复, 在此不再赘 述。
根据本发明实施例提供的基站,该基站基于切换请求中携带的第一目标基 站的基站标识, 可以与第一目标基站协商确定 UE承载的负担, 从而有利于实 现将 UE切换到两个目标基站, 并可以快速恢复 UE的当前业务, 增强用户的 通信体验。
图 24是根据本发明实施例的基站 2400的结构框图。 基站 2400中的接收 模块 2410、 第一确定模块 2420和发送模块 2430与基站 2300中的接收模块 2310、 第一确定模块 2320和发送模块 2330基本相同。
根据本发明的一个实施例, 基站 2400可以包括第二确定模块 2440。 第二 确定模块 2440可用于基于第一目标基站的基站标识与第一目标基站协商确定 主站点。
根据本发明的一个实施例, 第二确定模块 2440 可以包括第一确定单元 2442、 第二确定单元 2444、 第三确定单元 2446、 第四确定单元 2448和第五确 定单元 2449之一。 第一确定单元 2442可用于根据基站 2400和第一目标基站 接收切换请求的顺序,确定主站点。 第二确定单元 2444可用于根据预定配置, 确定主站点。 第三确定单元 2446可用于根据基站 2400和第一目标基站与 UE 建立 RRC连接的顺序,确定主站点。 第四确定单元 2448可用于根据切换请求 携带第一目标基站的基站标识和基站 2400的基站标识的顺序, 确定主站点。 第五确定单元 2449可用于根据第二目标基站响应于基站 2400发送的请求确定 主站点的请求消息而返回的响应消息, 确定主站点。
第二确定模块 2440、 第一确定单元 2442、 第二确定单元 2444、 第三确定 单元 2446、 第四确定单元 2448和第五确定单元 2449的上述和其他操作和 /或 功能可以参考上述方法 1300和方法 200中的相应部分, 为了避免重复, 在此 不再赘述。
根据本发明实施例提供的基站,该基站基于切换请求中携带的第一目标基 站的基站标识, 可以通过多种方式与第一目标基站协商确定主站点。 此外, 该 基站可以与第一目标基站协商确定 UE承载的负担, 从而有利于实现将 UE切 换到两个目标基站, 并可以快速恢复 UE的当前业务, 增强用户的通信体验。
图 25是根据本发明实施例的基站 2500的结构框图。
基站 2500可以包括第一发送模块 2510和第二发送模块 2520, 可以分别 是处理器单元。 第一发送模块 2510可用于在用户设备 UE与第一基站和第二 基站分别建立有 RRC连接的情况下, 当需要将 UE从第二基站切换到目标基 站时, 向目标基站发送携带第一基站的基站标识的切换请求, 以使目标基站基 于第一基站的基站标识与第一基站进行交互。 第二发送模块 2520可用于收到 目标基站返回的同意切换的切换响应之后, 向 UE发送切换命令以指示 UE切 换到目标基站。
第一发送模块 2510和第二发送模块 2520的上述和其他操作和 /或功能可 以参考上述方法 1400中的相关内容, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的基站, 当需要对具有两个 RRC连接的 UE切换 一个 RRC连接时,通过在切换请求中携带保持 RRC连接不变的源基站的基站 标识, 可以使目标基站快速发现该源基站并与之进行交互,从而实现两者更好 地配合来为 UE进行服务, 使得可以减小切换对用户通信体验的影响。
图 26是根据本发明实施例的基站 2600的结构框图。
基站 2600包括接收模块 2610、 交互模块 2620和切换模块 2630, 可以分 别是处理器单元。 接收模块 2610可用于在用户设备 UE与第一基站和第二基 站分别建立有 RRC连接的情况下, 当需要将 UE从第二基站切换到目标基站 时,接收第二基站发送的携带第一基站的基站标识的切换请求。交互模块 2620 可用于基于基站标识与第一基站进行交互。 切换模块 2630可用于当基于切换 请求确定同意切换时, 与第二基站完成 UE的切换。
接收模块 2610、 交互模块 2620和切换模块 2630的上述操作和 /或功能可 以参考上述方法 1500中的相关内容, 为了避免重复, 在此不再赘述。
根据本发明实施例提供的基站, 当需要对具有两个 RRC连接的 UE切换 一个 RRC连接时,该基站通过在切换请求中携带的保持 RRC连接不变的源基 站的基站标识, 可以快速发现该源基站并与之进行交互,从而实现两者更好地 配合来为 UE进行服务, 使得可以减小切换对用户通信体验的影响。
本领域技术人员可以意识到,结合本文中所公开的实施例中描述的各方法 步骤和单元, 能够以电子硬件、 计算机软件或者二者的结合来实现, 为了清楚 地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地描述了各 实施例的步骤及组成。这些功能究竟以硬件还是软件方式来执行,取决于技术 方案的特定应用和设计约束条件。本领域技术人员可以对每个特定的应用使用 不同方法来实现所描述的功能, 但是这种实现不应认为超出本发明的范围。
结合本文中所公开的实施例描述的方法步骤可以用硬件、处理器执行的软 件程序、或者二者的结合来实施。软件程序可以置于随机存取存储器(RAM )、 内存、 只读存储器(ROM ) 、 电可编程 ROM、 电可擦除可编程 ROM、 寄存 器、 硬盘、 可移动磁盘、 CD-ROM 或技术领域内所公知的任意其它形式的存 储介质中。
尽管已示出和描述了本发明的一些实施例, 但本领域技术人员应该理解, 在不脱离本发明的原理和精神的情况下, 可对这些实施例进行各种修改, 这样 的修改应落入本发明的范围内。

Claims

权 利 要 求
1. 一种切换方法, 其特征在于, 包括:
当需要对用户设备 UE进行切换时, 获取所述 UE在第一基站上的承载上下 文信息, 所述第一基站为所述 UE的源基站;
向目标基站发送切换请求, 所述切换请求携带所述承载上下文信息, 所述 承载上下文信息用于目标基站确定是否接受 UE切换;
收到所述目标基站返回的同意切换的切换响应之后, 向所述 UE发送切换 命令以指示所述 UE切换到所述目标基站。
2. 根据权利要求 1所述的方法, 其特征在于, 还包括:
向所述第一基站发送切换指示,以指示所述第一基站向所述目标基站进行 数据转发。
3. 根据权利要求 1或 2所述的方法, 其特征在于, 在所述第一基站与所述 UE建立有 RRC连接的情况下, 所述切换请求携带所述第一基站的基站标识, 以向所述目标基站指示所述第一基站与所述 UE建立有 RRC连接。
4. 根据权利要求 3所述的方法, 其特征在于, 还包括:
当所述 UE切换到所述目标基站之后, 所述目标基站基于所述第一基站的 基站标识指示所述第一基站释放所述 UE的相关资源。
5. 根据权利要求 1或 2所述的方法, 其特征在于, 还包括:
当所述 UE切换到所述目标基站之后, 所述 UE指示所述第一基站释放所述 UE的相关资源。
6. 根据权利要求 1或 2所述的方法, 其特征在于, 所述获取 UE在第一基站 上的承载上下文信息包括如下之一: 接收所述第一基站更新所述承载上下文信息时发送的该承载上下文信息; 向所述第一基站请求所述承载上下文信息,并接收所述第一基站返回的该 承载上下文信息;
接收所述第一基站基于测量报告发送的该承载上下文信息。
7. 根据权利要求 1或 2所述的方法, 其特征在于, 所述目标基站包括第一 目标基站和第二目标基站,其中所述切换请求携带所述第一目标基站的基站标 识和所述第二目标基站的基站标识。
8. 根据权利要求 7所述的方法, 其特征在于, 还包括:
当所述第一目标基站收到所述切换请求时,所述第一目标基站基于所述第 二目标基站的基站标识与所述第二目标基站协商确定第一目标基站与第二目 标基站各自需要承担的所述 UE的承载。
9. 根据权利要求 7所述的方法, 其特征在于, 还包括:
所述第一目标基站基于所述第二目标基站的基站标识与所述第二目标基 站协商确定主站点。
10. 根据权利要求 9所述的方法, 其特征在于, 所述第一目标基站基于所 述第二目标基站的基站标识与所述第二目标基站协商确定主站点包括:
根据如下之一, 所述第一目标基站确定所述主站点:
所述第一目标基站和所述第二目标基站接收所述切换请求的顺序;
预定配置;
所述第一目标基站和所述第二目标基站与所述 UE建立 RRC连接的顺 序;
所述切换请求携带所述第一目标基站的基站标识和所述第二目标基站的 基站标识的顺序;
所述第二目标基站响应于所述第一目标基站发送的请求确定主站点的请 求消息而返回的响应消息。
11. 一种切换方法, 其特征在于, 包括:
当需要对用户设备 UE进行切换时, 向目标基站发送切换请求;
收到所述目标基站返回的同意切换的切换响应之后, 向为所述 UE提供服 务的第一基站发送切换指示,以指示所述第一基站向所述目标基站进行数据转 发;
向所述 UE发送切换命令以指示所述 UE切换到所述目标基站。
12. 根据权利要求 11所述的方法, 其特征在于, 在所述第一基站与所述
UE建立有 RRC连接的情况下, 所述切换请求携带所述第一基站的基站标识, 以向所述目标基站指示所述第一基站与所述 UE建立有 RRC连接。
13. 根据权利要求 12所述的方法, 其特征在于, 还包括:
当所述 UE切换到所述目标基站之后, 所述目标基站基于所述第一基站的 基站标识指示所述第一基站释放所述 UE的相关资源。
14. 根据权利要求 11所述的方法, 其特征在于, 还包括:
当所述 UE切换到所述目标基站之后, 所述 UE指示所述第一基站释放所述 相关资源。
15. 根据权利要求 11所述的方法, 其特征在于, 所述目标基站包括第一目 标基站和第二目标基站,其中所述切换请求携带所述第一目标基站的基站标识 和所述第二目标基站的基站标识。
16. 根据权利要求 15所述的方法, 其特征在于, 还包括: 当所述第一目标基站收到所述切换请求时,所述第一目标基站基于所述第 二目标基站的基站标识与所述第二目标基站协商确定第一目标基站与第二目 标基站各自需要承担的所述 UE的承载。
17. 根据权利要求 15所述的方法, 其特征在于, 还包括:
所述第一目标基站基于所述第二目标基站的基站标识与所述第二目标基 站协商确定主站点。
18. 根据权利要求 17所述的方法, 其特征在于, 所述第一目标基站基于所 述第二目标基站的基站标识与所述第二目标基站协商确定主站点包括:
根据如下之一, 所述第一目标基站确定所述主站点:
所述第一目标基站和所述第二目标基站接收所述切换请求的顺序;
预定配置;
所述第一目标基站和所述第二目标基站与所述 UE建立 RRC连接的顺 序;
所述切换请求携带所述第一目标基站的基站标识和所述第二目标基站的 基站标识的顺序;
所述第二目标基站响应于所述第一目标基站发送的请求确定主站点的请 求消息而返回的响应消息。
19. 一种切换方法, 其特征在于, 包括:
接收第一基站针对需要切换的用户设备 UE发送的切换请求;
将所述 UE在第二基站上的承载上下文信息添加到所接收的切换请求中, 并向目标基站发送该切换请求,所述承载上下文信息用于目标基站确定是否接 受 UE切换; 向所述第一基站发送所述目标基站返回的同意切换的切换响应,以指示所 述第一基站基于所述切换响应向所述 UE发送切换命令, 所述切换命令用于指 示所述 UE切换到所述目标基站。
20. 根据权利要求 19所述的方法, 其特征在于, 所述目标基站包括第一目 标基站和第二目标基站,其中所述切换请求携带所述第一目标基站的基站标识 和所述第二目标基站的基站标识。
21. 根据权利要求 20所述的方法, 其特征在于, 还包括:
当所述第一目标基站收到所述切换请求时,所述第一目标基站基于所述第 二目标基站的基站标识与所述第二目标基站协商确定第一目标基站与第二目 标基站各自需要承担的所述 UE的承载。
22. 根据权利要求 20所述的方法, 其特征在于, 还包括:
所述第一目标基站基于所述第二目标基站的基站标识与所述第二目标基 站协商确定主站点。
23. 根据权利要求 22所述的方法, 其特征在于, 所述第一目标基站基于所 述第二目标基站的基站标识与所述第二目标基站协商确定主站点包括:
根据如下之一, 所述第一目标基站确定所述主站点:
所述第一目标基站和所述第二目标基站接收所述切换请求的顺序;
预定配置;
所述第一目标基站和所述第二目标基站与所述 UE建立 RRC连接的顺 序;
所述切换请求携带所述第一目标基站的基站标识和所述第二目标基站的 基站标识的顺序; 所述第二目标基站响应于所述第一目标基站发送的请求确定主站点的请 求消息而返回的响应消息。
24. 一种切换方法, 其特征在于, 包括:
接收源基站针对需要切换的用户设备 UE发送的切换请求, 所述切换请求 携带所述 UE的承载上下文信息和第一目标基站的基站标识;
基于所述第一目标基站的基站标识与所述第一目标基站协商确定各自需 要承担的与所述承载上下文信息相关的承载;
当协商成功时, 向所述源基站返回同意切换的切换响应。
25. 根据权利要求 24所述的方法, 其特征在于, 还包括:
基于所述第一目标基站的基站标识与所述第一目标基站协商确定主站点。
26. 根据权利要求 25所述的方法, 其特征在于, 所述基于所述第一目标基 站的基站标识与所述第一目标基站协商确定主站点包括:
根据如下之一, 确定所述主站点:
和所述第一目标基站接收所述切换请求的顺序;
预定配置;
和所述第一目标基站与所述 UE建立 RRC连接的顺序;
所述切换请求携带所述第一目标基站的基站标识和第二目标基站的基站 标识的顺序;
所述第一目标基站响应于向所述第一目标基站发送的请求确定主站点的 请求消息而返回的响应消息。
27. 一种切换方法, 其特征在于, 包括:
在用户设备 UE与第一基站和第二基站分别建立有 RRC连接的情况下, 当 需要将所述 UE从所述第二基站切换到目标基站时, 接收所述第二基站发送的 携带所述第一基站的基站标识的切换请求;
基于所述基站标识与所述第一基站进行交互;
当基于所述切换请求确定同意切换时, 与所述第二基站完成所述 UE的切 换。
28. 一种基站, 其特征在于, 包括:
获取模块, 用于当需要对用户设备 UE进行切换时, 获取所述 UE在第一基 站上的承载上下文信息, 所述第一基站为所述 UE的源基站;
第一发送模块, 用于向目标基站发送切换请求, 所述切换请求携带所述承 载上下文信息, 所述承载上下文信息用于目标基站确定是否接受 UE切换; 第二发送模块, 用于收到所述目标基站返回的同意切换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述目标基站。
29. 根据权利要求 28所述的基站, 其特征在于, 还包括:
第三发送模块, 用于向所述第一基站发送切换指示, 以指示所述第一基站 向所述目标基站进行数据转发。
30. 根据权利要求 28或 29所述的基站, 其特征在于, 所述获取模块包括如 下之一:
第一接收单元,用于接收所述第一基站更新所述承载上下文信息时发送的 该 7|载上下文信息;
请求单元, 用于向所述第一基站请求所述承载上下文信息, 以及第二接收 单元, 用于接收所述第一基站返回的该承载上下文信息;
第三接收单元,用于接收所述第一基站基于测量报告发送的该承载上下文 信息。
31. 一种基站, 其特征在于, 包括:
第一发送模块, 用于当需要对用户设备 UE进行切换时, 向目标基站发送 切换请求;
第二发送模块, 用于收到所述目标基站返回的同意切换的切换响应之后, 向为所述 UE提供服务的第一基站发送切换指示, 以指示所述第一基站向所述 目标基站进行数据转发;
第三发送模块, 用于向所述 UE发送切换命令以指示所述 UE切换到所述目 标基站。
32. 一种基站, 其特征在于, 包括:
发送模块, 用于当需要对用户设备 UE进行切换时, 向为所述 UE提供服务 的第一基站发送切换请求, 以使所述第一基站将所述 UE在所述第一基站上的 承载上下文信息添加到所述切换请求中并向所述目标基站转发,所述承载上下 文信息用于所述目标基站确定是否接受 UE切换;
接收模块,用于收到所述第一基站发送的所述目标基站返回的同意切换的 切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述目标基站。
33. 一种基站, 其特征在于, 包括:
接收模块, 用于接收第一基站针对需要切换的用户设备 UE发送的切换请 求;
添加模块, 用于将所述 UE在所述基站上的承载上下文信息添加到所接收 的切换请求中, 并向目标基站发送该切换请求, 所述承载上下文信息用于所述 目标基站确定是否接受 UE切换; 发送模块,用于向所述第一基站发送所述目标基站返回的同意切换的切换 响应, 以指示所述第一基站基于所述切换响应向所述 UE发送切换命令, 所述 切换命令用于指示所述 UE切换到所述目标基站。
34. —种基站, 其特征在于, 包括:
第一发送模块, 用于当需要对用户设备 UE进行切换时, 向第一目标基站 和第二目标基站发送切换请求,所述切换请求携带所述 UE的承载上下文信息、 所述第一目标基站的基站标识和所述第二目标基站的基站标识,以使所述第一 目标基站基于所述第二目标基站的基站标识与所述第二目标基站协商确定所 述第一目标基站和所述第二目标基站各自需要承担的与所述承载上下文信息 相关的承载,所述承载上下文信息用于所述第一目标基站和所述第二目标基站 确定是否接受 UE切换;
第二发送模块,用于当收到所述第一目标基站和所述第二目标基站返回的 同意切换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述 第一目标基站和所述第二目标基站。
35. 一种基站, 其特征在于, 包括:
接收模块,用于接收源基站针对需要切换的用户设备 UE发送的切换请求, 所述切换请求携带所述 UE的承载上下文信息和第一目标基站的基站标识; 第一确定模块,用于基于所述第一目标基站的基站标识与所述第一目标基 站协商确定各自需要承担的与所述承载上下文信息相关的承载;
发送模块, 用于当协商成功时, 向所述源基站返回同意切换的切换响应。
36. 根据权利要求 35所述的基站, 其特征在于, 还包括:
第二确定模块,用于基于所述第一目标基站的基站标识与所述第一目标基 站协商确定主站点。
37. 根据权利要求 36所述的基站, 其特征在于, 所述第二确定模块包括如 下之一:
第一确定单元,用于根据所述基站和所述第一目标基站接收所述切换请求 的顺序, 确定所述主站点;
第二确定单元, 用于根据预定配置, 确定所述主站点;
第三确定单元, 用于根据所述基站和所述第一目标基站与所述 UE建立 RRC连接的顺序, 确定所述主站点;
第四确定单元,用于根据所述切换请求携带所述第一目标基站的基站标识 和所述基站的基站标识的顺序, 确定所述主站点;
第五确定单元,用于根据所述第二目标基站响应于所述基站发送的请求确 定主站点的请求消息而返回的响应消息, 确定所述主站点。
38. 一种基站, 其特征在于, 包括:
第一发送模块, 用于在用户设备 UE与第一基站和第二基站分别建立有 RRC连接的情况下, 当需要将所述 UE从所述第二基站切换到目标基站时, 向 所述目标基站发送携带所述第一基站的基站标识的切换请求,以使所述目标基 站基于所述第一基站的基站标识与所述第一基站进行交互;
第二发送模块, 用于收到所述目标基站返回的同意切换的切换响应之后, 向所述 UE发送切换命令以指示所述 UE切换到所述目标基站。
39. 一种基站, 其特征在于, 包括:
接收模块, 用于在用户设备 UE与第一基站和第二基站分别建立有 RRC连 接的情况下, 当需要将所述 UE从所述第二基站切换到目标基站时, 接收所述 第二基站发送的携带所述第一基站的基站标识的切换请求;
交互模块, 用于基于所述基站标识与所述第一基站进行交互;
切换模块, 用于当基于所述切换请求确定同意切换时, 与所述第二基站完 成所述 UE的切换。
PCT/CN2012/075269 2011-05-25 2012-05-10 切换方法和基站 WO2012159529A1 (zh)

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