WO2017166989A1 - 一种切换过程中的资源分配方法、源基站及目标基站 - Google Patents

一种切换过程中的资源分配方法、源基站及目标基站 Download PDF

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Publication number
WO2017166989A1
WO2017166989A1 PCT/CN2017/076258 CN2017076258W WO2017166989A1 WO 2017166989 A1 WO2017166989 A1 WO 2017166989A1 CN 2017076258 W CN2017076258 W CN 2017076258W WO 2017166989 A1 WO2017166989 A1 WO 2017166989A1
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Prior art keywords
buffer status
base station
switched terminal
downlink
buffer
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English (en)
French (fr)
Inventor
赵亚利
许芳丽
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Definitions

  • the present disclosure relates to the field of wireless communication switching technologies, and in particular, to a resource allocation method, a source base station, and a target base station in a handover process.
  • the source base station (eNB) decides to perform an X2 handover operation according to the measurement result, and the source eNB sends a handover request message to the target eNB.
  • the handover request message includes an access layer key KeNB* that needs to be changed after handover, and parameters related to all bearers of the terminal (UE). Then, the target eNB configures new bearers according to these parameters, including Signaling Radio Bearer (SRB) and Packet Data Convergence Protocol (PDCP)/Radio Link Control (RLC) of Data Radio Bearer (DRB). ) / Medium Access Control (MAC) entity, etc.
  • SRB Signaling Radio Bearer
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • the target eNB performs an admission decision, and if the decision is acceptable, the target eNB returns a handover response message to the source eNB.
  • the source eNB After receiving the handover response message, the source eNB sends a Radio Resource Control (RRC) reconfiguration message to the UE, and the source eNB stops receiving and transmitting data and control planes.
  • RRC Radio Resource Control
  • the UE After receiving the RRC reconfiguration message, the UE starts to stop receiving and transmitting data and control planes of the source eNB, and performs synchronization operation with the target eNB.
  • RRC Radio Resource Control
  • the above synchronization operations include downlink synchronization and uplink synchronization.
  • the following is as follows:
  • the UE first performs downlink synchronization with the target base station through the physical layer process, and then according to the downlink timing relationship of the target base station, and the preamble and PRACH (Physical Random Access Channel) carried in the RRC reconfiguration signaling.
  • the channel indicates that a random access channel (RACH) process (specifically, non-contention random access or contention random access) is initiated to the target base station.
  • RACH random access channel
  • the purpose of the RACH is to establish uplink synchronization with the target base station.
  • the technical problem to be solved by the embodiments of the present disclosure is to provide a resource allocation method, a source base station, and a target base station in a handover process, so that the target base station can allocate resources more reasonably during the handover process.
  • the resource allocation method in the handover process includes: determining, by the source base station, a current buffer state of the to-be-switched terminal, where the buffer state includes an uplink buffer state and a downlink buffer state. At least one of the source base stations sends buffer status indication information indicating the current buffer status of the to-be-switched terminal to the target base station according to the current buffer status of the to-be-switched terminal; the source base station receives the target base station according to The buffer status indication information is resource allocation information returned after the resource is allocated to the to-be-switched terminal; the source base station sends the resource allocation information to the to-be-switched terminal.
  • the source base station further carries the buffer status indication information in a handover request and sends the information to the target base station; and the source base station further sends a handover response from the target base station.
  • the resource allocation information is received in the message; and the source base station further carries the resource allocation information in an RRC connection reconfiguration message and sends the information to the to-be-switched terminal.
  • the step of determining a current buffer state of the to-be-switched terminal includes: according to the last uplink scheduling request of the to-be-switched terminal The status of the uplink buffer is reported, and the current uplink buffer status of the to-be-switched terminal is determined; or, according to the status of the uplink buffer reported by the to-be-switched terminal in the latest uplink scheduling request, and the latest uplink scheduling request is reported.
  • Determining the current uplink buffer status of the to-be-switched terminal or determining the current status of the to-be-switched terminal according to the status of the uplink buffer reported by the to-be-switched terminal in the latest measurement report.
  • the status of the uplink buffer is determined; or, according to the status of the uplink buffer reported by the terminal to be switched in the latest measurement report, and the uplink scheduling status of the terminal to be switched after the latest measurement report is reported, the current terminal to be switched is determined.
  • Upstream buffer status is determined.
  • the sending when the buffer status includes an uplink buffer status, the sending, according to a current buffer status of the to-be-switched terminal, sending a reference to the target base station
  • the step of indicating the buffer status indication information of the current buffer status of the to-be-switched terminal includes: determining an uplink buffer status of each logical channel group LCG of the to-be-switched terminal according to the current uplink buffer status of the to-be-switched terminal Calculating a first sum value of an uplink buffer status of each LCG, and transmitting, to the target base station, first buffer status indication information that carries the first sum value; or, according to the current uplink buffer of the to-be-switched terminal
  • the status of the area determining an uplink buffer status of each LCG of the to-be-switched terminal, and transmitting, to the target base station, second buffer status indication information that carries an uplink buffer status of some or all of the LCGs.
  • the second buffer status indication information when the second buffer status indication information is sent to the target base station, the second buffer status indication information is further carried in the second buffer status indication information.
  • QoS parameters when the second buffer status indication information is sent to the target base station, the second buffer status indication information is further carried in the second buffer status indication information.
  • the step of determining a current buffer state of the to-be-switched terminal includes: performing current downlink RBs of the to-be-switched terminal
  • the buffer status is used as the current downlink buffer status of the to-be-switched terminal; or, according to the QoS parameters of each RB, the current downlink RBs of the to-be-switched terminal are grouped, and the downlink buffer status corresponding to each downlink RB group is determined.
  • the current downlink buffer state of the to-be-switched terminal includes: performing current downlink RBs of the to-be-switched terminal The buffer status is used as the current downlink buffer status of the to-be-switched terminal; or, according to the QoS parameters of each RB, the current downlink RBs of the to-be-switched terminal are grouped, and the downlink buffer status corresponding to each downlink RB group is determined.
  • the buffer status indication information of the current buffer status includes: when the current downlink buffer status of the to-be-switched terminal is the buffer status of each current downlink RB of the to-be-switched terminal: calculating the current status of the to-be-switched terminal Transmitting, by the second sum value of the buffer status of each downlink RB, the third buffer status indication information that carries the second sum value to the target base station; or, according to the current downlink RB buffer of the to-be-switched terminal a status of the area, sending, to the target base station, fourth buffer status indication information that carries a downlink buffer status of a part or all of the downlink RBs; and a current downlink buffer status of the to-be-switched terminal is a downlink of the to-be-
  • the part or all downlink RBs are further carried in the fourth buffer status indication information.
  • the QoS parameter corresponding to the part or all of the downlink RB groups is further carried in the sixth buffer status indication information when the sixth buffer status indication information is sent to the target base station.
  • the embodiment of the present disclosure further provides a resource allocation method in another handover process, including: receiving, by the target base station, buffer status indication information, which is sent by the source base station, and indicating a current buffer status of the to-be-switched terminal, where the buffer status is And including at least one of an uplink buffer state and a downlink buffer state, where the target base station allocates a corresponding resource to the to-be-switched terminal according to the buffer status indication information, and sends, to the source base station, a Resource allocation information for resources.
  • the target base station further receives the buffer status indication information from a handover request sent by the source base station, and the target base station further carries the resource allocation information.
  • the source base station is sent in a handover response message.
  • the embodiment of the present disclosure further provides a source base station, including: a buffer state determining unit, configured to determine a current buffer state of a to-be-switched terminal that performs handover, where the buffer state includes an uplink buffer state and a downlink buffer state.
  • a buffer state determining unit configured to determine a current buffer state of a to-be-switched terminal that performs handover, where the buffer state includes an uplink buffer state and a downlink buffer state.
  • At least one of the first sending unit configured to send buffer status indication information indicating a current buffer status of the to-be-switched terminal to the target base station according to the current buffer status of the to-be-switched terminal; a unit, configured to receive resource allocation information returned by the target base station after the resource is allocated to the to-be-switched terminal according to the buffer status indication information, where the second sending unit is configured to send the resource allocation information to the to-be-switched terminal .
  • the first sending unit further carries the buffer status indication information in a handover request and sends the information to the target base station; and the receiving unit further sends the information from the target base station.
  • the resource response information is received in the handover response message; and the second sending unit further carries the resource allocation information in an RRC connection reconfiguration message and sends the information to the to-be-switched terminal.
  • the buffer status determining unit includes: an uplink buffer status determining unit, configured to: when the buffer status includes an uplink buffer status: according to a last uplink scheduling request of the to-be-switched terminal The status of the uplink buffer in the middle of the report, determining the terminal to be switched The current uplink buffer status; or, according to the uplink buffer status reported by the to-be-switched terminal in the latest uplink scheduling request, and the uplink scheduling status of the to-be-switched terminal after the latest uplink scheduling request is reported, Determining the current uplink buffer status of the terminal to be switched; or determining the current uplink buffer status of the to-be-switched terminal according to the status of the uplink buffer reported by the terminal to be switched in the latest measurement report; or, according to the terminal to be switched, the latest The status of the uplink buffer reported in the measurement report and the uplink scheduling status of the terminal to be switched after the latest measurement report is reported, and the current uplink buffer status of the to
  • the first sending unit includes: an uplink buffer status sending unit, configured to: when the buffer status includes an uplink buffer status: according to the current uplink buffer of the to-be-switched terminal a state, determining an uplink buffer status of each LCG of the to-be-switched terminal, calculating a first sum value of an uplink buffer status of each LCG, and transmitting, to the target base station, a first buffer status that carries the first sum value And indicating, according to the current uplink buffer status of the to-be-switched terminal, an uplink buffer status of each LCG of the to-be-switched terminal, and sending an uplink buffer status carrying part or all of the LCG to the target base station.
  • the second buffer status indication information configured to: when the buffer status includes an uplink buffer status: according to the current uplink buffer of the to-be-switched terminal a state, determining an uplink buffer status of each LCG of the to-be-switched terminal, calculating a first sum value of an uplink buffer status of
  • the uplink buffer status sending unit further carries the second buffer status indication information when transmitting the second buffer status indication information to the target base station.
  • the QoS parameters corresponding to some or all of the LCGs.
  • the buffer state determining unit includes: a downlink buffer state determining unit, configured to: when the buffer state includes a downlink buffer state: current downlink RBs of the to-be-switched terminal
  • the buffer status is used as the current downlink buffer status of the to-be-switched terminal; or, according to the QoS parameters of each RB, the current downlink RBs of the to-be-switched terminal are grouped, and the downlink buffer corresponding to each downlink RB group is determined.
  • the status is used as the current downlink buffer status of the to-be-switched terminal.
  • the first sending unit includes: a downlink buffer state sending unit, configured to: in a current downlink buffer state of the to-be-switched terminal, a current buffer of each downlink RB of the to-be-switched terminal a state of the buffer: calculating a second sum value of the buffer status of each of the downlink RBs of the to-be-switched terminal, and transmitting, to the target base station, third buffer status indication information that carries the second sum value; or, according to The buffer status of each downlink RB of the terminal to be switched, Transmitting, to the target base station, fourth buffer status indication information that carries a downlink buffer status of a part or all of the downlink RBs; and, in the current downlink buffer status of the to-be-switched terminal, each downlink RB of the to-be-switched terminal
  • the third buffer value of the buffer status corresponding to each downlink RB group of the to-be-switched terminal is calculated, and the
  • the downlink status sending unit when the fourth buffer status indication information is sent to the target base station, the downlink status sending unit further carries the part or the fourth buffer status indication information. All the QoS parameters corresponding to the downlink RBs; and, when the sixth buffer status indication information is sent to the target base station, further carrying the partial or all downlink RB groups corresponding to the sixth buffer status indication information QoS parameters.
  • the embodiment of the present disclosure further provides a target base station, including: a receiving unit, configured to receive buffer status indication information that is sent by the source base station to indicate a current buffer status of the to-be-switched terminal that performs the handover, where the buffer status is At least one of an uplink buffer state and a downlink buffer state, where the allocation unit is configured to allocate a corresponding resource to the to-be-switched terminal according to the buffer status indication information, and send a unit, to the source
  • the base station transmits resource allocation information indicating the resource.
  • the receiving unit is further configured to receive the buffer status indication information from a handover request sent by the source base station, and the sending unit is further configured to:
  • the resource allocation information is carried in the handover response message and sent to the source base station.
  • Embodiments of the present disclosure also provide a source base station comprising: a processor, a memory and a transceiver; wherein the memory stores computer readable instructions executable by the processor, wherein the computer readable instructions are When executed, the processor is configured to: send, by the transceiver, buffer status indication information indicating a current buffer status of the to-be-switched terminal to the target base station, and the receiving target base station is to be switched according to the buffer status indication information.
  • Embodiments of the present disclosure also provide a target base station, comprising: a processor, a memory, and a transceiver; wherein the memory stores computer readable instructions executable by the processor, wherein the computer readable instructions are When executed, the processor is configured to: receive, by using a transceiver, buffer status indication information sent by the source base station to indicate a current buffer status of the to-be-switched terminal that performs handover, where the buffer status includes an uplink buffer status and At least one of a downlink buffer state, and transmitting resource allocation information for indicating the resource to the source base station; and allocating a corresponding resource to the to-be-switched terminal according to the buffer status indication information.
  • a target base station comprising: a processor, a memory, and a transceiver; wherein the memory stores computer readable instructions executable by the processor, wherein the computer readable instructions are When executed, the processor is configured to: receive, by using a transceiver, buffer status indication information sent by the source base
  • Embodiments of the present disclosure also provide a non-volatile computer storage medium storing computer readable instructions executable by a processor, the processor: to a target when the computer readable instructions are executed by a processor Transmitting, by the base station, buffer status indication information indicating a current buffer status of the to-be-switched terminal, and resource allocation information returned by the receiving target base station after allocating resources for the to-be-switched terminal according to the buffer status indication information; and, to be switched Transmitting, by the terminal, the resource allocation information; and determining a current buffer state of the to-be-switched terminal that performs the handover, where the buffer state includes at least one of an uplink buffer state and a downlink buffer state; and, according to the to-be-switched The current buffer status of the terminal determines buffer status indication information used to indicate the current buffer status of the to-be-switched terminal.
  • Embodiments of the present disclosure also provide a non-volatile computer storage medium storing computer readable instructions executable by a processor, the processor: receiving source when the computer readable instructions are executed by a processor a buffer status indication information sent by the base station to indicate a current buffer status of the to-be-switched terminal that performs handover, where the buffer status includes at least one of an uplink buffer status and a downlink buffer status, and The source base station sends resource allocation information for indicating the resource; and allocates a corresponding resource to the to-be-switched terminal according to the buffer status indication information.
  • the resource allocation method, the source base station, and the target base station in the handover process provided by the embodiment of the present disclosure, by sending, by the source base station, the information about the uplink/downstream buffer status of the terminal to the target base station during the handover process,
  • the target base station can allocate uplink and/or downlink resources to the terminal, thereby avoiding blind allocation of resources by the target base station and improving resource allocation rationality.
  • FIG. 1 is a schematic diagram of a resource allocation method in a handover process according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of another resource allocation method in a handover process according to an embodiment of the present disclosure
  • FIG. 3 is a schematic flowchart of resource allocation of a wireless communication system according to an embodiment of the present disclosure
  • FIG. 4 is another schematic flowchart of resource allocation of a wireless communication system according to an embodiment of the present disclosure
  • FIG. 5 is still another schematic flowchart of resource allocation of a wireless communication system according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of a source base station according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another source base station according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a target base station according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of another target base station according to an embodiment of the present disclosure.
  • system and “network” are used interchangeably herein.
  • B corresponding to A means that B is associated with A, and B can be determined from A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the source base station is a base station to which the current serving cell of the terminal belongs
  • the target base station is a base station to which the target cell to which the terminal handover belongs.
  • the base station is not limited in form, and may be a Macro Base Station, a Pico Base Station, a Node B (referred to as a 3G mobile base station), or an Enhanced Base Station (ENB).
  • a home enhanced base station Femto eNB or Home eNode B or Home eNB or HNEB
  • a relay station an access point, and the like.
  • the terminal may be a mobile phone (or mobile phone), or other device capable of transmitting or receiving wireless signals, including user equipment (UE), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop Computers, cordless phones, wireless local loop (WLL) stations, or mobile smart hotspots, smart home appliances, or other devices that communicate with mobile communication networks without human intervention.
  • UE user equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • the service interruption time of the above X2 handover process is generally about 50ms, and sometimes it is as high as 80ms or more. The service interruption delay during the handover process affects the user experience.
  • 3GPP has carried out LR (Latency Reduction) project, one of which is to reduce the delay in the handover process.
  • LR Loss Reduction
  • One specific delay reduction scheme mentioned in this project is the RACH-less handover.
  • the UE may use the RACH-less handover, and there are two schemes to implement the RACH-less handover:
  • Solution 1 One method is that the UE directly switches from the source cell to the target cell in a suitable System Frame Number (SFN), and does not perform a random access procedure;
  • SFN System Frame Number
  • Solution 2 Another method is that the UE performs a traditional handover procedure, but skips the random access procedure and switches to the target cell.
  • the total delay of the handover process is usually 40 to 50 ms, and the general RACH process delay is 10 to 12 ms. Therefore, skipping the RACH process can significantly reduce the service interruption time during the handover process.
  • the purpose of the RACH in the handover process is to obtain the time advance (TA) of the target cell and the uplink scheduling grant of the UE to obtain the handover completion signaling transmission. Therefore, the RACH-less handover process has two problems to be solved, including 1) how to obtain the TA of the target cell and 2) how to obtain the uplink resource allocation (uplink scheduling grant) of the target cell. For the above problem 2), it is necessary to provide a resource allocation scheme, so that the target base station can reasonably allocate resources during the RACH-less handover process.
  • uplink resource allocation uplink scheduling grant
  • downlink resource allocation of the target cell. If the target base station only performs blind allocation of uplink/downlink resources, blind allocation may easily lead to unreasonable resource allocation. For example, if the resource allocation is too large, the resource will be wasted; if the resource allocation is too small, the subsequent scheduling request/buffer status report (SR/BSR) process will be required, which will cause unnecessary uplink overhead.
  • SR/BSR scheduling request/buffer status report
  • the embodiments of the present disclosure provide a resource allocation method in a handover process for a handover process (including but not limited to RACH-less handover) of the related art, so that the target base station can allocate uplink and/or downlink resources to the terminal more reasonably.
  • the handover may be an X2 port based X2 handover or a RACH-less handover.
  • the embodiment of the present disclosure can avoid the blind allocation of resources caused by the lack of the RACH process of the target base station, and improve the rationality of resource allocation.
  • the embodiment of the present disclosure provides a resource allocation method in a handover process.
  • the resource allocation method includes the following steps:
  • Step 11 The source base station determines a current buffer state of the to-be-switched terminal, where the buffer state includes at least one of an uplink buffer state and a downlink buffer state.
  • Step 12 The source base station sends buffer state indication information indicating the current buffer status of the to-be-switched terminal to the target base station according to the current buffer status of the to-be-switched terminal.
  • the source base station may carry the buffer status indication information in a handover request and send the information to the target base station.
  • Step 13 The source base station receives resource allocation information returned by the target base station after allocating resources for the to-be-switched terminal according to the buffer status indication information.
  • the source base station may receive the resource allocation information from a handover response message sent by the target base station.
  • Step 14 The source base station sends the resource allocation information to the to-be-switched terminal.
  • the source base station may carry the resource allocation information in an RRC connection reconfiguration message and send the message to the to-be-switched terminal, so that the to-be-switched terminal may switch to the target cell corresponding to the target base station, and may perform uplink and/or Downstream resources for data transmission.
  • the embodiment of the present disclosure may send, by the source base station, related information of the uplink and/or downlink buffer status of the terminal to the target base station, so that the target base station may allocate uplink and/or downlink for the terminal according to the foregoing.
  • the resources avoid the blind allocation of resources by the target base station and improve the rationality of resource allocation.
  • the determining the current buffer state of the to-be-switched terminal may be implemented in the following manner: according to the terminal to be switched in the latest The status of the uplink buffer reported in the uplink scheduling request, determining the current uplink buffer status of the to-be-switched terminal, or the status of the uplink buffer reported by the terminal to be switched in the latest uplink scheduling request, and the last time Determining the current uplink buffer status of the to-be-switched terminal after the uplink scheduling request is reported, and determining the current uplink buffer status of the to-be-switched terminal; or determining the status according to the uplink buffer status reported by the to-be-switched terminal in the latest measurement report.
  • the current uplink buffer status of the terminal to be switched or, according to the status of the uplink buffer reported by the terminal to be switched in the latest measurement report, and the uplink scheduling of the terminal to be switched after the latest measurement report is reported, The current uplink buffer status of the switching terminal is mentioned.
  • the buffer status indication information for indicating the current buffer status of the to-be-switched terminal is sent to the target base station according to the current buffer status of the to-be-switched terminal.
  • the method is as follows: determining, according to the current uplink buffer status of the to-be-switched terminal, an uplink buffer status of each logical channel group (LCG) of the to-be-switched terminal, and calculating a first state of an uplink buffer status of each LCG.
  • LCG logical channel group
  • the first buffer status indication information carrying the first sum value is sent to the target base station; or the LCG of the to-be-switched terminal is determined according to the current uplink buffer status of the to-be-switched terminal
  • the second buffer status indication information carrying the status of the uplink buffer of some or all of the LCGs is sent to the target base station.
  • the QoS (Quality of Service) parameter corresponding to the part or all of the LCG may be further carried in the second buffer status indication information.
  • the determining the current buffer state of the to-be-switched terminal may be implemented as follows:
  • the buffer status of the downlink radio bearer (RB, Radio Bearer) is used as the current downlink buffer status of the to-be-switched terminal; or, according to the QoS parameters of each RB, the current downlink RBs of the to-be-switched terminal are grouped and determined.
  • the downlink buffer status corresponding to each downlink RB group is used as the current downlink buffer status of the to-be-switched terminal.
  • the buffer status indication information for indicating the current buffer status of the to-be-switched terminal is sent to the target base station according to the current buffer status of the to-be-switched terminal.
  • the method is as follows: when the current downlink buffer status of the to-be-switched terminal is the buffer status of each downlink RB of the to-be-switched terminal: calculating a second sum value of the current buffer status of each downlink RB of the to-be-switched terminal Transmitting, to the target base station, third buffer status indication information that carries the second sum value; or sending, according to the current buffer status of each downlink RB of the to-be-switched terminal, the carried part to the target base station Or the fourth buffer status indication information of the downlink buffer status of all the downlink RBs; when the current downlink buffer status of the to-be-switched terminal is the buffer status corresponding to each downlink RB group of the to-be-switched terminal: And a third sum
  • the source base station may further carry the QoS parameter corresponding to the part or all the downlink RBs in the fourth buffer status indication information when the fourth buffer status indication information is sent to the target base station. .
  • the source base station may further carry the QoS corresponding to the part or all the downlink RB groups in the sixth buffer status indication information when the sixth buffer status indication information is sent to the target base station. parameter.
  • the buffer status determined in the foregoing step 11 may include both an upstream buffer status and a downlink buffer status. In this case, reference may be made to the specific implementation of the foregoing two situations.
  • step 11 the current uplink buffer state and the downlink buffer state of the terminal to be switched are determined;
  • step 12 the buffer status indication information for indicating the current uplink buffer status and the downlink buffer status of the to-be-switched terminal is sent to the target base station, so that the target base station allocates uplink to the to-be-switched terminal according to the buffer status indication information.
  • the resource and the downlink resource are received, and the resource allocation information sent by the target base station is received in step 13.
  • the related information of the allocated resource is sent to the terminal to be switched, so that the terminal to be switched is switched to the target corresponding to the target base station.
  • the uplink resource is used to send uplink data to the target base station according to the resource allocated by the target base station, and the downlink data sent by the target base station is received on the downlink resource.
  • the resource allocation method includes the following steps:
  • Step 21 The target base station receives the buffer status indication information that is sent by the source base station and is used to indicate the current buffer status of the to-be-switched terminal, where the buffer status includes at least one of an uplink buffer status and a downlink buffer status.
  • the target base station may receive the buffer status indication information from a handover request sent by the source base station.
  • Step 22 The target base station allocates corresponding resources to the to-be-switched terminal according to the buffer status indication information.
  • Step 23 Send resource allocation information indicating the resource to the source base station.
  • the target base station may carry the resource allocation information in a handover response message and send the information to the source base station.
  • the target base station allocates corresponding resources to the to-be-switched terminal according to the current buffer status of the to-be-switched terminal indicated by the buffer status indication information.
  • the target base station allocates corresponding resources to the to-be-switched terminal according to the current buffer status of the to-be-switched terminal indicated by the buffer status indication information.
  • the target base station may allocate uplink and/or downlink resources to the terminal according to the information about the current uplink and/or downlink buffer status of the terminal sent by the source base station, thereby enabling the terminal to allocate uplink and/or downlink resources to the terminal. Achieve targeted resource allocation, avoid blind distribution behavior, and improve the rationality of resource allocation.
  • an uplink resource allocation method in a handover process is applied to a wireless communication system including a terminal, a source base station, and a target base station, and the resource allocation method package Including the following steps:
  • Step 31 The terminal reports the measurement report to the source base station.
  • the terminal may trigger on the current serving cell and the neighboring cell periodically or based on a predetermined event.
  • the terminal sends a measurement report to the source base station, where the measurement report usually includes the measurement result of the serving cell and the neighboring cell.
  • the terminal may carry the current uplink buffer state information of the terminal in the measurement report.
  • the terminal may also report the current uplink buffer state information to the source base station in the uplink scheduling request.
  • the uplink buffer state information may be an uplink buffer state (such as a buffer size, etc.) of each logical channel group (LCG) of the terminal to be switched.
  • Step 32 The source base station performs a handover decision according to the measurement report of the terminal in step 31.
  • the target cell to be handed over and the target base station to which the target cell belongs are determined.
  • the implementation of the handover decision can be implemented by referring to the related art, which is not limited by the embodiment of the present disclosure.
  • Step 33 The source base station determines uplink buffer state information of the terminal to be switched, that is, the terminal to be switched. Specifically, the uplink buffer status information of the to-be-switched terminal may be determined in any of the following manners:
  • Manner 1 Determine the current uplink buffer status of the to-be-switched terminal according to the status of the uplink buffer reported by the terminal to be switched in the latest uplink scheduling request. For example, the status of the uplink buffer reported by the terminal in the latest uplink scheduling request is directly used as the current uplink buffer status information of the to-be-switched terminal.
  • Mode 2 The source base station according to the uplink buffer status information reported by the terminal to be switched, for example, the uplink buffer status information reported in the uplink scheduling request, and the uplink of the to-be-switched terminal after reporting the uplink buffer status information.
  • the scheduling situation determines the current uplink buffer status information of the to-be-switched terminal.
  • the source base station calculates the first data of the uplink scheduling transmission of the to-be-switched terminal during the period when the to-be-switched terminal reports the uplink buffer status information to the current time (eg, before the sending of the handover request message in step 34). And calculating a difference between the uplink buffer state information reported by the last uplink scheduling request of the to-be-switched terminal and the first data amount, to obtain current uplink buffer state information of the to-be-switched terminal.
  • Mode 3 The receiving terminal to be switched carries the current uplink buffer state information in the latest measurement report in step 31, and the source base station directly determines the current uplink buffer state information of the to-be-switched terminal according to the information.
  • the uplink buffer status information reported in the measurement report is used as the current uplink buffer status information of the to-be-switched terminal.
  • Manner 4 combining the foregoing mode 2 and mode 3, that is, determining the current uplink buffer state of the to-be-switched terminal according to the buffer state information carried in the latest measurement report and the uplink scheduling situation of the to-be-switched terminal after the measurement report is reported. information.
  • the source base station calculates a second data amount of the uplink scheduling transmission of the to-be-switched terminal during the period when the to-be-switched terminal reports the measurement report last time, and then to the current time (such as before the sending of the handover request message in step 34), and then And calculating a difference between the uplink buffer state information and the second data amount reported in the last measurement report of the to-be-switched terminal, to obtain current uplink buffer state information of the to-be-switched terminal.
  • Step 34 The source base station sends a handover request to the target base station, requesting to handover the terminal to the target cell corresponding to the target base station.
  • the handover request can refer to the implementation of the related art.
  • the embodiment of the present disclosure may carry buffer status indication information indicating the current uplink buffer status of the terminal in the handover request.
  • the buffer status indication information carried in the handover request may be determined in any of the following manners:
  • Method 1 determining, according to the current uplink buffer status of the to-be-switched terminal, an uplink buffer status of each LCG of the to-be-switched terminal, and calculating a first sum value of an uplink buffer status of each LCG, where the first sum is The value is sent to the target base station as the buffer status indication information.
  • Manner 2 determining, according to the current uplink buffer status of the to-be-switched terminal, an uplink buffer status of each LCG of the to-be-switched terminal, and using an uplink buffer status of part or all of the LCG of the to-be-switched terminal as the Buffer status indication information is sent to the target base station.
  • the source base station may use, as the buffer, the uplink buffer state information of the LCG whose importance level satisfies a predetermined level according to the quality of service (QoS) parameters corresponding to the respective LCGs, such as the QoS level identifier (QCI) or the priority (priority).
  • QoS quality of service
  • the zone status indication information is sent to the target base station.
  • Step 35 The target base station performs an admission decision according to the handover request, and allocates a corresponding uplink resource to the to-be-switched terminal according to the buffer status indication information when the handover is allowed.
  • the target base station may allocate an uplink resource according to the buffer status indication information of the to-be-switched terminal, for example, when the buffer status indication information indicates that the uplink buffer of the terminal is large, the target terminal is allocated more The uplink resource is configured to meet the transmission requirement. Conversely, when the buffer status indication information indicates that the uplink buffer of the terminal is small, less uplink resources are allocated to the to-be-switched terminal to avoid wasting resources.
  • the embodiment of the present disclosure enables the target base station to obtain the related information of the uplink buffer state of the terminal to be switched, and then performs reasonable resource allocation.
  • the embodiment of the present disclosure does not limit the specific resource allocation manner.
  • Step 36 The target base station sends a handover response message to the source base station, and may carry resource allocation information for indicating the uplink resource in the handover response message.
  • the target base station may carry the time-frequency position indication information of the uplink resource in the resource allocation information, where the time domain location indication information may be a subframe number that is valid for the specific frequency domain resource, or an effective time period (starting subframe) Number and termination subframe number or duration), or the starting subframe number and period in effect.
  • the target base station may further include a resource end time in the resource allocation information.
  • the target base station may send the resource allocation information to the source base station by using other messages.
  • Step 37 After receiving the handover response message sent by the target base station, the source base station sends an RRC connection reconfiguration message to the terminal to perform RRC connection reconfiguration.
  • the RRC connection reconfiguration message carries the resource allocation information received in step 36.
  • Step 38 The terminal establishes an RRC connection with the target base station according to the RRC connection reconfiguration message, switches to the target cell corresponding to the target base station, and uses the target base station to send uplink data to the target base station for the allocated uplink resource.
  • a downlink resource allocation method in a handover process is also applied to a wireless communication system including a terminal, a source base station, and a target base station, where the resource allocation method includes the following steps:
  • Step 41 The terminal performs measurement reporting, for example, reporting the measurement result to the serving cell and the neighboring cell to the source base station.
  • Step 42 The source base station performs a handover decision according to the measurement result reported by the terminal in step 41, and assumes that handover needs to be performed, and determines the target cell and its home base station at this time.
  • Step 43 The source base station determines downlink buffer state information of the terminal to be switched. Specifically, the uplink buffer status information of the to-be-switched terminal may be determined in any of the following manners:
  • Manner 1 The current buffer status of each downlink RB of the to-be-switched terminal is used as the current downlink buffer status of the to-be-switched terminal, that is, the current downlink of the terminal is obtained according to the current buffer status of each downlink RB of the terminal. Buffer status.
  • Manner 2 The current downlink RBs of the to-be-switched terminal are grouped according to the QoS parameters of the RBs, and the downlink buffer state corresponding to each downlink RB group is determined as the current downlink buffer state of the to-be-switched terminal.
  • Step 44 The source base station sends a handover request to the target base station, requesting to switch the terminal to the target cell corresponding to the target base station.
  • the embodiment of the present disclosure may carry buffer status indication information indicating a current downlink buffer status of the to-be-switched terminal in the handover request.
  • the buffer status indication information carried in the handover request may be determined in any of the following manners:
  • Method 1 When the current downlink buffer status of the to-be-switched terminal is the buffer status of each downlink RB of the to-be-switched terminal, calculate a second sum value of the current buffer status of each downlink RB of the to-be-switched terminal Sending the second sum value as the buffer status indication information to the target base station; or, according to the current buffer status of each downlink RB of the to-be-switched terminal, the downlink buffer status of some or all downlink RBs, The buffer status indication information is sent to the target base station. For example, according to the QoS related parameter, the downlink buffer status of the part of the downlink RB with the higher importance level is sent to the target base station.
  • Manner 2 calculating a buffer state corresponding to each downlink RB group of the to-be-switched terminal when the current downlink buffer state of the to-be-switched terminal is a buffer state corresponding to each downlink RB group of the to-be-switched terminal And a value, the third sum value is sent to the target base station as the buffer status indication information; or, according to the buffer status corresponding to each current downlink RB group of the to-be-switched terminal, some or all downlink RB groups are corresponding.
  • the downlink buffer status is sent to the target base station as the buffer status indication information. For example, according to the QoS related parameter, the downlink buffer status of the part of the downlink RB group with the higher importance level is sent to the target base station.
  • Step 45 After receiving the handover request sent by the source base station, the target base station performs an admission decision, and if yes, the buffer status indicator carried in the handover request message according to the source base station. The information is displayed, and the downlink resource is allocated to the handover terminal.
  • the buffer status indication information indicates that the downlink buffer of the terminal is large, allocate more downlink resources to the to-be-switched terminal to meet the transmission requirement; otherwise, the buffer status indication information indicates the downlink of the terminal.
  • the buffer status indication information indicates the downlink of the terminal.
  • the embodiment of the present disclosure enables the target base station to obtain the related information of the uplink buffer state of the terminal to be switched, and then performs reasonable resource allocation.
  • the embodiment of the present disclosure does not limit the specific resource allocation manner.
  • Step 46 The target base station sends a handover response message to the source base station, where the resource allocation information indicating the downlink resource allocated for the terminal may be carried.
  • the resource allocation information sent by the target base station to the source base station may carry the time-frequency position indication information of the resource, where the time domain location indication information may be a subframe number that is valid for the specific frequency domain resource, or an effective time period (starting subframe) Number and termination subframe number or duration), or the starting subframe number and period in effect.
  • the target base station may further include a resource end time in the resource allocation information.
  • the target base station may send the resource allocation information to the source base station by using other messages.
  • Step 47 After receiving the handover response message sent by the target base station, the source base station sends an RRC connection reconfiguration message to the terminal to perform RRC connection reconfiguration.
  • the RRC connection reconfiguration message carries the resource allocation information received in step 46.
  • Step 48 The terminal establishes an RRC connection with the target base station according to the RRC connection reconfiguration message, switches to the target cell corresponding to the target base station, and receives downlink data sent by the target base station by using the downlink resource allocated by the target base station.
  • the uplink and downlink resource allocation method in the handover process provided by the embodiment of the present disclosure is applied to a wireless communication system including a terminal, a source base station, and a target base station, and the resource allocation method simultaneously allocates the terminal to be switched.
  • Upstream and downlink resources as shown in Figure 5, the method includes the following steps:
  • step 51 the terminal reports the measurement report to the source base station.
  • the terminal may carry the current uplink buffer status information of the terminal in the measurement report.
  • Step 52 The base station performs a handover decision according to the measurement result reported by the terminal in step 51, The target cell to be handed over and its home base station.
  • Step 53 The source base station determines uplink buffer status information and downlink buffer status information of the handover terminal.
  • Step 54 The source base station sends a handover request to the target base station, requesting to handover the terminal to the target cell corresponding to the target base station.
  • the handover request can refer to the implementation of the related art.
  • the handover request may carry first buffer status indication information indicating a current uplink buffer status of the terminal, and second buffer status indication information indicating a downlink buffer status.
  • the first buffer status indication information may be referred to the implementation in the foregoing step 34.
  • the second buffer status indication information may refer to the implementation in the foregoing step 44. To save space, no further details are provided herein.
  • Step 55 The target base station performs an admission decision according to the handover request, and allocates corresponding uplink resources and downlink resources to the to-be-switched terminal according to the buffer status indication information when the handover is allowed.
  • the specific uplink and downlink resource allocation manners may refer to the implementation manners in the foregoing steps 35 and 45, respectively, and details are not described herein again.
  • Step 56 The target base station sends a handover response message to the source base station, and may carry resource allocation information for indicating the uplink resource and the downlink resource in the handover response message.
  • the resource allocation information may include time-frequency location indication information of the uplink/downlink resources, where the time domain location indication information may be a subframe number that is valid for a specific frequency domain resource, or an effective time period (starting subframe number) And the terminating subframe number or duration), or the starting subframe number and period in effect.
  • the target base station may further include a resource end time in the resource allocation information.
  • Step 57 After receiving the handover response message sent by the target base station, the source base station sends an RRC connection reconfiguration message to the terminal to perform RRC connection reconfiguration.
  • the RRC connection reconfiguration message carries the resource allocation information received in step 56.
  • Step 58 The terminal establishes an RRC with the target base station according to the foregoing RRC connection reconfiguration message. And connecting to the target cell corresponding to the target base station, and transmitting the uplink data to the target base station by using the uplink resource allocated by the target base station, and receiving the downlink data sent by the target base station by using the downlink resource allocated by the target base station.
  • the embodiment of the present disclosure further provides a source base station, where the source base station is a base station to which the current serving cell of the to-be-switched terminal belongs.
  • the source base station 60 includes: a buffer status determination.
  • the unit 61 is configured to determine a current buffer state of the to-be-switched terminal that performs the handover, where the buffer state includes at least one of an uplink buffer state and a downlink buffer state, where the first sending unit 62 is configured to The buffer status indication information of the current buffer status of the to-be-switched terminal is sent to the target base station, and the receiving unit 63 is configured to receive the target base station according to the buffer status indication.
  • the information is the resource allocation information that is returned after the resource is allocated to the to-be-switched terminal.
  • the second sending unit 64 is configured to send the resource allocation information to the to-be-switched terminal.
  • the first sending unit 62 further carries the buffer status indication information in the handover request and sends the information to the target base station; the receiving unit 63 further sends a handover response message from the target base station. Receiving the resource allocation information; and the second sending unit 64 further carries the resource allocation information in an RRC connection reconfiguration message and sends the information to the to-be-switched terminal.
  • the buffer state determining unit 61 includes: an uplink buffer state determining unit, configured to: when the buffer state includes an uplink buffer state, according to the uplink reported by the to-be-switched terminal in the latest uplink scheduling request a status of the buffer to determine the current uplink buffer status of the to-be-switched terminal; or, according to the status of the uplink buffer reported by the to-be-switched terminal in the latest uplink scheduling request, and the reporting of the latest uplink scheduling request Determining the current uplink buffer status of the terminal to be switched, and determining the current uplink buffer status of the to-be-switched terminal according to the status of the uplink buffer reported by the terminal to be switched in the latest measurement report.
  • an uplink buffer state determining unit configured to: when the buffer state includes an uplink buffer state, according to the uplink reported by the to-be-switched terminal in the latest uplink scheduling request a status of the buffer to determine the current uplink buffer status of the to-be-switched terminal; or, according to
  • the status of the current uplink buffer of the to-be-switched terminal is determined according to the status of the uplink buffer reported by the terminal to be switched in the latest measurement report and the uplink scheduling status of the terminal to be switched after the latest measurement report is reported. Zone status.
  • the first sending unit 62 includes: an uplink state sending unit, configured to: when the buffer state includes an uplink buffer state: according to a current uplink buffer shape of the to-be-switched terminal a state, determining an uplink buffer state of each LCG of the to-be-switched terminal, calculating a first sum value of an uplink buffer state of each LCG, and transmitting, to the target base station, a first buffer state that carries the first sum value And indicating, according to the current uplink buffer status of the to-be-switched terminal, an uplink buffer status of each LCG of the to-be-switched terminal, and sending an uplink buffer status carrying part or all of the LCG to the target base station.
  • the second buffer status indication information configured to: when the buffer state includes an uplink buffer state: according to a current uplink buffer shape of the to-be-switched terminal a state, determining an uplink buffer state of each LCG of the to-be-switched terminal, calculating a first sum value of an
  • the uplink state sending unit further carries the part or all of the LCG in the second buffer status indication information when the second buffer status indication information is sent to the target base station. Corresponding QoS parameters.
  • the buffer state determining unit 61 includes: a downlink buffer state determining unit, configured to: when the buffer state includes a downlink buffer state: buffer state of each current downlink RB of the to-be-switched terminal As the current downlink buffer state of the to-be-switched terminal, or according to the QoS parameters of each RB, the current downlink RBs of the to-be-switched terminal are grouped, and the downlink buffer state corresponding to each downlink RB group is determined.
  • the current downlink buffer status of the switching terminal is mentioned.
  • the first sending unit 62 includes: a downlink state sending unit, configured to: when the current downlink buffer state of the to-be-switched terminal is a buffer state of each current downlink RB of the to-be-switched terminal: Determining a second sum value of a buffer state of each of the downlink RBs of the switching terminal, and transmitting, to the target base station, third buffer status indication information that carries the second sum value; or, according to the current to-be-switched terminal a buffer status of each downlink RB, sending, to the target base station, fourth buffer status indication information that carries a downlink buffer status of a part or all of the downlink RBs; and the current downlink buffer status of the to-be-switched terminal is Calculating a buffer state corresponding to each downlink RB group of the to-be-switched terminal: calculating a third sum value of a buffer state corresponding to each downlink RB group of the to-be-switched terminal, and transmitting, by the
  • the downlink state sending unit further carries the QoS parameter corresponding to the part or all the downlink RBs in the fourth buffer status indication information when the fourth buffer status indication information is sent to the target base station. And transmitting the sixth buffer to the target base station When the status indication information is used, the QoS parameters corresponding to the part or all of the downlink RB groups are further carried in the sixth buffer status indication information.
  • the embodiment of the present disclosure further provides another source base station, where the source base station is a base station to which the current serving cell of the to-be-switched terminal belongs.
  • the source base station includes: a first transceiver 71, configured to send to the target base station.
  • a buffer status indication information indicating a current buffer status of the to-be-switched terminal, and resource allocation information returned by the receiving target base station after allocating resources for the to-be-switched terminal according to the buffer status indication information; and transmitting to the to-be-switched terminal a resource allocation information
  • the first processor 72 is configured to determine a current buffer state of the to-be-switched terminal that performs the handover, where the buffer state includes at least one of an uplink buffer state and a downlink buffer state; and, according to The current buffer status of the to-be-switched terminal determines buffer status indication information used to indicate the current buffer status of the to-be-switched terminal.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by the first processor 72 and various circuits of the memory represented by the first memory 73. .
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the first transceiver 71 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the embodiment of the present disclosure further provides a target base station, which is a base station to which the target cell to which the to-be-switched terminal is to be handed over.
  • the target base station 80 includes: a receiving unit 81, configured to receive, by the source base station, Buffer status indication information indicating a current buffer status of the to-be-switched terminal performing handover, the buffer status including at least one of an uplink buffer status and a downlink buffer status; and an allocating unit 82 for The buffer status indication information is used to allocate a corresponding resource to the to-be-switched terminal, and the sending unit 83 is configured to send, to the source base station, resource allocation information for indicating the resource.
  • the receiving unit 81 is further configured to receive the buffer status indication information from a handover request sent by the source base station, and the sending unit 83 is further configured to allocate the resource allocation information.
  • the bearer is sent to the source base station in a handover response message.
  • the target base station includes: a second transceiver 91, configured to receive a buffer status sent by the source base station to indicate a current buffer status of the to-be-switched terminal that performs the handover. Instructing, the buffer state includes at least one of an uplink buffer state and a downlink buffer state, and sending resource allocation information for indicating the resource to the source base station; the second processor 92, And allocating corresponding resources to the to-be-switched terminal according to the buffer status indication information.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by the second processor 92 and various circuits of the memory represented by the second memory 93. .
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the second transceiver 91 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the resource allocation method, the source base station, and the target base station in the handover process provided by the embodiment of the present disclosure enable the target base station to transmit related information of the uplink/downstream buffer status of the terminal to the target base station by the source base station during the handover process. Resources can be allocated more reasonably during handover.

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Abstract

本公开提供了一种切换过程中的资源分配方法、源基站以及目标基站。所述方法包括：源基站确定待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；源基站根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息；源基站接收目标基站在根据所述缓冲区状态指示信息为所述待切换终端分配资源后返回的资源分配信息；源基站向所述待切换终端发送所述资源分配信息。

Description

一种切换过程中的资源分配方法、源基站及目标基站
相关申请的交叉引用
本申请主张在2016年4月1日在中国提交的中国专利申请号No.201610203605.X的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及无线通信切换技术领域，具体涉及一种切换过程中的资源分配方法、源基站及目标基站。
背景技术
长期演进系统(LTE，Long Term Evolution)中的基于X2接口的切换流程中，源基站(eNB)根据测量结果，判决执行X2切换操作，由源eNB向目标eNB发送切换请求消息。该切换请求消息中包含切换后需要改变的接入层密钥KeNB*以及终端(UE)所有承载相关的参数等。随后，目标eNB根据这些参数，配置新的承载，包括信令无线承载(SRB，Signaling Radio Bearer)以及数据无线承载(DRB，Data Radio Bearer)的Packet Data Convergence Protocol(PDCP)/Radio Link Control(RLC)/Medium Access Control(MAC)实体等。目标eNB执行接纳判断，如果判决可以接纳，那么目标eNB向源eNB返回切换响应消息。源eNB接收到切换响应消息后向UE发送无线资源控制(Radio Resource Control，RRC)重配置消息，同时源eNB停止数据和控制面的接收和发送。UE接收到RRC重配置消息后，开始停止在源eNB的数据和控制面的接收和发送，并和目标eNB进行同步操作。
上述同步操作包括下行同步和上行同步。具体如下：UE首先通过物理层过程完成和目标基站的下行同步，随后根据目标基站的下行定时关系，以及RRC重配信令中携带的前导码(preamble)和PRACH(Physical RandomAccess Channel，物理随机接入信道)指示，向目标基站发起随机接入信道(RACH)过程(具体可以是非竞争随机接入或者竞争随机接入)。RACH的目的是建立和目标基站的上行同步。
需要提供一种方案，能够在UE切换过程中，为UE合理的分配目标小区的上行资源(上行调度授权)，以合理利用目标小区资源，减少后续不必要的 调度请求/缓冲区状态报告(Scheduling Request(SR)/Buffer Status Report(BSR))过程造成的上行开销。
发明内容
本公开实施例要解决的技术问题是提供一种切换过程中的资源分配方法、源基站及目标基站，使得目标基站在切换过程中能更为合理的分配资源。
为解决上述技术问题，本公开实施例提供的切换过程中的资源分配方法，包括：源基站确定待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；源基站根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息；源基站接收目标基站在根据所述缓冲区状态指示信息为所述待切换终端分配资源后返回的资源分配信息；源基站向所述待切换终端发送所述资源分配信息。
可选的，上述的资源分配方法中，所述源基站进一步将所述缓冲区状态指示信息携带在切换请求中发送给所述目标基站；所述源基站进一步从所述目标基站发送的切换响应消息中接收所述资源分配信息；以及，所述源基站进一步将所述资源分配信息携带在RRC连接重配消息中发送给所述待切换终端。
可选的，上述的资源分配方法中，在所述缓冲区状态包括上行缓冲区状态时，所述确定待切换终端当前的缓冲区状态的步骤包括：根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，以及所述最近一次上行调度请求上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，以及所述最近一次测量报告上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态。
可选的，上述的资源分配方法中，在所述缓冲区状态包括上行缓冲区状态时，所述根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指 示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息的步骤包括：根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个逻辑信道组LCG的上行缓冲区状态，计算各个LCG的上行缓冲区状态的第一和值，向所述目标基站发送携带有所述第一和值的第一缓冲区状态指示信息；或者，根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，向所述目标基站发送携带有部分或全部LCG的上行缓冲区状态的第二缓冲区状态指示信息。
可选的，上述的资源分配方法中，在向所述目标基站发送所述第二缓冲区状态指示信息时，进一步在所述第二缓冲区状态指示信息中携带所述部分或全部LCG对应的QoS参数。
可选的，上述的资源分配方法中，在所述缓冲区状态包括下行缓冲区状态时，所述确定待切换终端当前的缓冲区状态的步骤包括：将所述待切换终端当前各个下行RB的缓冲区状态，作为所述待切换终端当前的下行缓冲区状态；或者，根据各RB的QoS参数，将所述待切换终端当前各个下行RB进行分组，确定各个下行RB组对应的下行缓冲区状态，作为所述待切换终端当前的下行缓冲区状态。
可选的，上述的资源分配方法中，在所述缓冲区状态包括下行缓冲区状态时，所述根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息的步骤包括：在所述待切换终端当前的下行缓冲区状态为所述待切换终端当前各个下行RB的缓冲区状态时：计算所述待切换终端当前各个下行RB的缓冲区状态的第二和值，向所述目标基站发送携带有所述第二和值的第三缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB的下行缓冲区状态的第四缓冲区状态指示信息；在所述待切换终端当前的下行缓冲区状态为所述待切换终端各个下行RB组对应的缓冲区状态时：计算所述待切换终端各个下行RB组对应的缓冲区状态的第三和值，向所述目标基站发送携带有所述第三和值的第五缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB组对应的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB组对应的下行 缓冲区状态的第六缓冲区状态指示信息。
可选的，上述的资源分配方法中，在向所述目标基站发送所述第四缓冲区状态指示信息时，进一步在所述第四缓冲区状态指示信息中携带所述部分或全部下行RB对应的QoS参数；在向所述目标基站发送所述第六缓冲区状态指示信息时，进一步在所述第六缓冲区状态指示信息中携带所述部分或全部下行RB组对应的QoS参数。
本公开实施例还提供了另一种切换过程中的资源分配方法，包括：目标基站接收源基站发送的用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；目标基站根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源，并向所述源基站发送用于指示所述资源的资源分配信息。
可选的，上述的资源分配方法中，所述目标基站进一步从所述源基站发送的切换请求中接收所述的缓冲区状态指示信息，以及，所述目标基站进一步将所述资源分配信息携带在切换响应消息中发送给所述源基站。
本公开实施例还提供了一种源基站，包括：缓冲区状态确定单元，用于确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；第一发送单元，用于根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息；接收单元，用于接收目标基站在根据所述缓冲区状态指示信息为所述待切换终端分配资源后返回的资源分配信息；第二发送单元，用于向所述待切换终端发送所述资源分配信息。
可选的，上述源基站中，所述第一发送单元，进一步将所述缓冲区状态指示信息携带在切换请求中发送给所述目标基站；所述接收单元，进一步从所述目标基站发送的切换响应消息中接收所述资源分配信息；以及，所述第二发送单元，进一步将所述资源分配信息携带在RRC连接重配消息中发送给所述待切换终端。
可选的，上述源基站中，所述缓冲区状态确定单元包括：上行缓冲区状态确定单元，用于在所述缓冲区状态包括上行缓冲区状态时：根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，确定所述待切换终端 当前的上行缓冲区状态；或者，根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，以及所述最近一次上行调度请求上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，以及所述最近一次测量报告上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态。
可选的，上述源基站中，所述第一发送单元包括：上行缓冲区状态发送单元，用于在所述缓冲区状态包括上行缓冲区状态时：根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，计算各个LCG的上行缓冲区状态的第一和值，向所述目标基站发送携带有所述第一和值的第一缓冲区状态指示信息；或者，根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，向所述目标基站发送携带有部分或全部LCG的上行缓冲区状态的第二缓冲区状态指示信息。
可选的，上述源基站中，所述上行缓冲区状态发送单元，在向所述目标基站发送所述第二缓冲区状态指示信息时，进一步在所述第二缓冲区状态指示信息中携带所述部分或全部LCG对应的QoS参数。
可选的，上述源基站中，所述缓冲区状态确定单元包括：下行缓冲区状态确定单元，用于在所述缓冲区状态包括下行缓冲区状态时：将所述待切换终端当前各个下行RB的缓冲区状态，作为所述待切换终端当前的下行缓冲区状态；或者，根据各RB的QoS参数，将所述待切换终端当前各个下行RB进行分组，确定各个下行RB组对应的下行缓冲区状态，作为所述待切换终端当前的下行缓冲区状态。
可选的，上述源基站中，所述第一发送单元包括：下行缓冲区状态发送单元，用于在所述待切换终端当前的下行缓冲区状态为所述待切换终端当前各个下行RB的缓冲区状态时：计算所述待切换终端当前各个下行RB的缓冲区状态的第二和值，向所述目标基站发送携带有所述第二和值的第三缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB的缓冲区状态， 向所述目标基站发送携带有部分或全部下行RB的下行缓冲区状态的第四缓冲区状态指示信息；以及，在所述待切换终端当前的下行缓冲区状态为所述待切换终端各个下行RB组对应的缓冲区状态时：计算所述待切换终端各个下行RB组对应的缓冲区状态的第三和值，向所述目标基站发送携带有所述第三和值的第五缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB组对应的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB组对应的下行缓冲区状态的第六缓冲区状态指示信息。
可选的，上述源基站中，所述下行状态发送单元在向所述目标基站发送所述第四缓冲区状态指示信息时，进一步在所述第四缓冲区状态指示信息中携带所述部分或全部下行RB对应的QoS参数；以及，在向所述目标基站发送所述第六缓冲区状态指示信息时，进一步在所述第六缓冲区状态指示信息中携带所述部分或全部下行RB组对应的QoS参数。
本公开实施例还提供了一种目标基站，包括：接收单元，用于接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；分配单元，用于根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源；发送单元，用于向所述源基站发送用于指示所述资源的资源分配信息。
可选的，上述目标基站中，所述接收单元，进一步用于从所述源基站发送的切换请求中接收所述的缓冲区状态指示信息，以及，所述发送单元，进一步用于将所述资源分配信息携带在切换响应消息中发送给所述源基站。
本公开实施例还提供了一种源基站，包括：处理器，存储器和收发机；其中，所述存储器存储有能够被所述处理器执行的计算机可读指令，在所述计算机可读指令被执行时，所述处理器用于：通过收发机，向目标基站发送用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，以及，接收目标基站在根据缓冲区状态指示信息为待切换终端分配资源后返回的资源分配信息；以及，向待切换终端发送所述资源分配信息；以及确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；以及，根据所述待切换终端当前的缓冲区状态， 确定用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息。
本公开实施例还提供了一种目标基站，包括：处理器，存储器和收发机；其中，所述存储器存储有能够被所述处理器执行的计算机可读指令，在所述计算机可读指令被执行时，所述处理器用于：通过收发机，接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种，以及，向所述源基站发送用于指示所述资源的资源分配信息；以及根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源。
本公开实施例还提供了一种非易失性计算机存储媒介，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器：向目标基站发送用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，以及，接收目标基站在根据缓冲区状态指示信息为待切换终端分配资源后返回的资源分配信息；以及，向待切换终端发送所述资源分配信息；以及确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；以及，根据所述待切换终端当前的缓冲区状态，确定用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息。
本公开实施例还提供了一种非易失性计算机存储媒介，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器：接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种，以及，向所述源基站发送用于指示所述资源的资源分配信息；以及根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源。
与相关技术相比，本公开实施例提供的切换过程中的资源分配方法、源基站及目标基站，通过在切换过程中由源基站向目标基站发送终端的上/下行缓冲区状态的相关信息，使得目标基站可以据此为终端分配上行和/或下行资源，避免了目标基站盲目分配资源，提高了资源分配的合理性。
附图说明
图1为本公开实施例的一种切换过程中的资源分配方法的示意图；
图2为本公开实施例的另一种切换过程中的资源分配方法的示意图；
图3为本公开实施例的无线通信系统的资源分配的一种流程示意图；
图4为本公开实施例的无线通信系统的资源分配的另一种流程示意图；
图5为本公开实施例的无线通信系统的资源分配的又一种流程示意图；
图6为本公开实施例提供的一种源基站的结构示意图；
图7为本公开实施例提供的另一种源基站的结构示意图；
图8为本公开实施例提供的一种目标基站的结构示意图；
图9为本公开实施例提供的另一种目标基站的结构示意图。
具体实施方式
为使本公开要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。在下面的描述中，提供诸如具体的配置和组件的特定细节仅仅是为了帮助全面理解本公开的实施例。因此，本领域技术人员应该清楚，可以对这里描述的实施例进行各种改变和修改而不脱离本公开的范围和精神。另外，为了清楚和简洁，省略了对已知功能和构造的描述。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本公开的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
在本公开的各种实施例中，应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本公开实施例的实施过程构成任何限定。
另外，本文中术语“系统”和“网络”在本文中常可互换使用。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请所提供的实施例中，应理解，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
本公开实施例中，源基站是终端当前服务小区所属的基站，目标基站是终端切换的目标小区所属的基站。在本公开的实施例中，所述基站的形式不限，可以是宏基站(Macro Base Station)、微基站(Pico Base Station)、Node B(3G移动基站的称呼)、增强型基站(ENB)、家庭增强型基站(Femto eNB或Home eNode B或Home eNB或HNEB)、中继站、接入点等。所述终端可以是移动电话(或手机)，或者其他能够发送或接收无线信号的设备，包括用户设备(UE)、个人数字助理(PDA)、无线调制解调器、无线通信装置、手持装置、膝上型计算机、无绳电话、无线本地回路(WLL)站、或移动智能热点、智能家电、或其他不通过人的操作就能白发与移动通信网络通信的设备等。
随着无线通信技术的快速发展，用户对业务体验的需求不断提升。业务体验最为关键的两个指标是数据速率和时延。由于时延一直是运营商或终端用户所关心的重要性能指标，因此时延缩减一直是业界的一个热点技术方向。而根据统计，上述X2切换过程的业务中断时间一般在50ms左右，有时会高达80ms以上。切换过程中的业务中断时延会影响用户体验。
因此3GPP进行了LR(Latency Reduction)立项，其中一个方向就是要降低切换过程中的时延。该立项中提到的一个具体时延缩减方案就是RACH-less切换。当源小区和目标小区是同步的情况下，UE可以使用RACH-less切换，具体有两种方案实现RACH-less切换：
方案1：一种方法是UE在合适(双方都同意的)的系统帧号(System Frame Number，SFN)从源小区直接切换到目标小区，不执行随机接入过程；
方案2：另一种方法是UE执行传统的切换过程，但跳过随机接入过程，切换到目标小区。
根据时延组成分析，切换过程的总时延通常为40～50ms，而一般情况RACH过程时延为10～12ms。因此，跳过RACH过程可以显著地降低切换过程中业务中断时间。
切换过程中RACH的目的包括获取到目标小区的时间提前量(TA)以及UE获取切换完成信令传输的上行调度授权。因此RACH-less切换过程有两方面的问题需要解决，包括1)如何获得目标小区的TA以及2)如何获得目标小区的上行资源分配(上行调度授权)。其中，针对上述问题2)，需要提供一种资源分配方案，使得目标基站能够RACH-less切换过程中合理分配资源。
RACH-less切换过程由于没有RACH过程，因此需要通过其他方法来获得目标小区的上行资源分配(上行调度授权)和/或下行资源分配。如果目标基站只执行上/下行资源的盲分配，盲分配容易导致资源分配不合理。例如，如果资源分配过大，则会造成资源浪费；如果资源分配过小，则会导致后续还需要调度请求/缓冲区状态报告(SR/BSR)过程，会造成不必要的上行开销。
本公开实施例针对相关技术的切换过程(包括但不限于RACH-less切换)，提供了一种切换过程中的资源分配方法，使得目标基站可以更为合理的为终端分配上行和/或下行资源。下文中，所述切换可以是基于X2口的X2切换，也可以是RACH-less切换。特别的，本公开实施例在应用于RACH-less切换时，能够避免目标基站因缺少RACH过程造成的资源盲分配，提高资源分配的合理性。
本公开实施例提供了一种切换过程中的资源分配方法，请参照图1，该资源分配方法包括以下步骤：
步骤11，源基站确定待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种。
步骤12，源基站根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息。
这里，所述源基站可以将所述缓冲区状态指示信息携带在切换请求中发送给所述目标基站。
步骤13，源基站接收目标基站在根据所述缓冲区状态指示信息为所述待切换终端分配资源后返回的资源分配信息。
这里，所述源基站可以从所述目标基站发送的切换响应消息中接收所述资源分配信息。
步骤14，源基站向所述待切换终端发送所述资源分配信息。
这里，所述源基站可以将所述资源分配信息携带在RRC连接重配消息中发送给所述待切换终端，这样待切换终端在切换至目标基站对应的目标小区后，可以根据上行和/或下行资源，进行数据的传输。
通过以上步骤，本公开实施例可以由源基站在切换过程中，将终端的上行和/或下行缓冲区状态的相关信息发送给目标基站，使得目标基站可以据此为终端分配上行和/或下行资源，避免了目标基站盲目分配资源，提高了资源分配的合理性。
本公开实施例中，当所述缓冲区状态仅包括上行缓冲区状态时，此时上述步骤11中，所述确定待切换终端当前的缓冲区状态可以按照以下方式实现：根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，以及所述最近一次上行调度请求上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，以及所述最近一次测量报告上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态。
相应的，上述步骤12中，所述根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息，则可以按照以下方式实现：根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个逻辑信道组(Logical Channel Group，LCG)的上行缓冲区状态，计算各个LCG的上行缓冲区状态的第一和值，向所述目标基站发送携带有所述第一和值的第一缓冲区状态指示信息；或者，根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，向所述目标基站发送携带有部分或全部LCG的上行缓冲区状态的第二缓冲区状态指示信息。这里，在向所述目标基站发送所述第二缓冲区状态指示信息时，还可以进一步在所述第二缓冲区状态指示信息中携带所述部分或全部LCG对应的QoS(Quality of Service)参数。
本公开实施例中，当所述缓冲区状态仅包括下行缓冲区状态时，上述步骤11中，所述确定待切换终端当前的缓冲区状态可以按照以下方式实现：将所述待切换终端当前各个下行无线承载(RB，Radio Bearer)的缓冲区状态，作为所述待切换终端当前的下行缓冲区状态；或者，根据各RB的QoS参数，将所述待切换终端当前各个下行RB进行分组，确定各个下行RB组对应的下行缓冲区状态，作为所述待切换终端当前的下行缓冲区状态。
相应的，上述步骤12中，所述根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息，则可以按照以下方式实现：在所述待切换终端当前的下行缓冲区状态为所述待切换终端当前各个下行RB的缓冲区状态时：计算所述待切换终端当前各个下行RB的缓冲区状态的第二和值，向所述目标基站发送携带有所述第二和值的第三缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB的下行缓冲区状态的第四缓冲区状态指示信息；在所述待切换终端当前的下行缓冲区状态为所述待切换终端各个下行RB组对应的缓冲区状态时：计算所述待切换终端各个下行RB组对应的缓冲区状态的第三和值，向所述目标基站发送携带有所述第三和值的第五缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB组对应的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB组对应的下行缓冲区状态的第六缓冲区状态指示信息。
这里，所述源基站在向所述目标基站发送所述第四缓冲区状态指示信息时，还可以进一步在所述第四缓冲区状态指示信息中携带所述部分或全部下行RB对应的QoS参数。或者，所述源基站在向所述目标基站发送所述第六缓冲区状态指示信息时，还可以进一步在所述第六缓冲区状态指示信息中携带所述部分或全部下行RB组对应的QoS参数。
以上针对上行缓冲区状态和下行缓冲区状态两种情况，分别进行了说明。本公开实施例中，在上述步骤11中所确定的缓冲区状态可能同时包括有上行缓冲区状态和下行缓冲区状态。此时，可以参照上述两种情况的具体实现，在步骤11中，确定待切换终端当前的上行缓冲区状态和下行缓冲区状态；在 步骤12中，向目标基站发送用于指示待切换终端当前的上行缓冲区状态和下行缓冲区状态的缓冲区状态指示信息，以使目标基站根据该缓冲区状态指示信息，为待切换终端分配上行资源和下行资源，并在步骤13中接收目标基站发送的资源分配信息，在步骤14中将所分配的资源的相关信息发送给待切换终端，这样，待切换终端在切换至目标基站对应的目标小区后，即可根据目标基站所分配的资源，利用上行资源向目标基站发送上行数据，以及在下行资源上接收目标基站发送的下行数据。
本公开实施例提供了另一种切换过程中的资源分配方法，请参照图2，该资源分配方法包括以下步骤：
步骤21，目标基站接收源基站发送的用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种。
这里，所述目标基站可以从所述源基站发送的切换请求中接收所述的缓冲区状态指示信息。
步骤22，目标基站根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源。
步骤23，向所述源基站发送用于指示所述资源的资源分配信息。
这里，所述目标基站可以将所述资源分配信息携带在切换响应消息中发送给所述源基站。
在上述步骤22中，目标基站根据上述缓冲区状态指示信息所指示的所述待切换终端当前的缓冲区状态，为所述待切换终端分配相应的资源。具体的资源分配方式可以参照相关技术的各种实现，本公开实施例对此不作限定。
通过以上步骤，本公开实施例中目标基站在切换过程中，可以根据源基站发送的终端的当前的上行和/或下行缓冲区状态的相关信息，为终端分配上行和/或下行资源，从而能够实现有针对性的进行资源分配，避免了盲目分配行为，提高了资源分配的合理性。
下面将结合无线通信系统的消息流程图，对本公开作进一步描述。
请参照图3所示，本公开实施例提供的切换过程中的上行资源分配方法，应用于包括终端、源基站和目标基站的无线通信系统中，该资源分配方法包 括以下步骤：
步骤31，终端向源基站上报测量报告。
这里，终端可以周期性或基于预定事件触发，对当前服务小区以及邻小区进行测量。当满足测量报告的上报条件时，终端向源基站发送测量报告，测量报告中通常包括有服务小区以及邻小区的测量结果。
本公开实施例中，终端可以在测量报告中可以携带本终端当前的上行缓冲区状态信息，当然，终端也可以在上行调度请求中向源基站上报当前的上行缓冲区状态信息。本公开实施例中，上行缓冲区状态信息可以是待切换终端各个逻辑信道组(LCG)的上行缓冲区状态(如缓冲区大小等)。
步骤32，源基站根据终端在步骤31中的测量报告进行切换判决，当需要执行小区切换时，确定切换的目标小区及该目标小区归属的目标基站。
这里，切换判决的实现方式可以参照相关技术实现，本公开实施例对此不作限定。
步骤33：源基站确定该待切换的终端(即待切换终端)的上行缓冲区状态信息。具体的，该待切换终端的上行缓冲区状态信息，可以按照以下任一方式确定：
方式1：根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态。例如，将终端在最近一次上行调度请求中上报的上行缓冲区状态，直接作为该待切换终端当前的上行缓冲区状态信息。
方式2：源基站根据待切换终端之前上报的上行缓冲区状态信息，例如，最近一次在上行调度请求中上报的上行缓冲区状态信息，以及在上报上行缓冲区状态信息后该待切换终端的上行调度情况，确定该待切换终端当前的上行缓冲区状态信息。
例如，源基站计算该待切换终端最近一次上报上行缓冲区状态信息，到当前时刻(如在步骤34的发送切换请求消息前)的这段时间内该待切换终端的上行调度传输的第一数据量，然后，计算该待切换终端最近一次上行调度请求中上报的上行缓冲区状态信息与所述第一数据量之间的差值，得到该待切换终端当前的上行缓冲区状态信息。
方式3：接收待切换终端在步骤31中最近一次的测量报告中携带当前上行缓冲区状态信息，源基站直接根据该信息，确定该待切换终端当前的上行缓冲区状态信息。
例如，将测量报告中上报的上行缓冲区状态信息，作为该待切换终端当前的上行缓冲区状态信息。
方式4：结合上述方式2和方式3，即，根据最近一次测量报告携带的缓冲区状态信息，以及测量报告上报后该待切换终端的上行调度情况，确定该待切换终端当前的上行缓冲区状态信息。
例如，源基站计算该待切换终端最近一次上报测量报告，到当前时刻(如在步骤34的发送切换请求消息前)的这段时间内该待切换终端的上行调度传输的第二数据量，然后，计算该待切换终端最近一次测量报告中上报的上行缓冲区状态信息与所述第二数据量之间的差值，得到该待切换终端当前的上行缓冲区状态信息。
步骤34，源基站向目标基站发送切换请求，请求将终端切换至目标基站对应的目标小区。该切换请求可以参考相关技术的实现。
本公开实施例可以在该切换请求中携带用于指示所述终端当前的上行缓冲区状态的缓冲区状态指示信息。具体的，该切换请求中携带的缓冲区状态指示信息可以按照以下任一方式确定：
方式1：根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，计算各个LCG的上行缓冲区状态的第一和值，将所述第一和值作为所述缓冲区状态指示信息发送给目标基站。
方式2：根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，将所述待切换终端的部分或全部LCG的上行缓冲区状态，作为所述缓冲区状态指示信息发送给所述目标基站。
这里，源基站可以根据各个LCG对应的服务质量(QoS)参数，比如QoS等级标识(QCI)或者优先级(priority)，将重要等级满足预定程度的LCG的上行缓冲区状态信息，作为所述缓冲区状态指示信息，发送给目标基站。
步骤35，目标基站根据所述切换请求，执行接纳判决，并在允许切换时，根据所述缓冲区状态指示信息，为所述待切换终端分配对应的上行资源。
这里，目标基站可以根据该待切换终端的所述缓冲区状态指示信息，分配上行资源，例如，在所述缓冲区状态指示信息表示终端的上行缓冲区较大时，为待切换终端分配较多的上行资源，以满足传输需求；反之，在所述缓冲区状态指示信息表示终端的上行缓冲区较少时，为待切换终端分配较少的上行资源，以避免浪费资源。
需要指出的是，本公开实施例使得目标基站能够获得待切换终端的上行缓冲区状态的相关信息，进而进行合理的资源分配，本公开实施例对于对具体的资源分配方式并不作限定。
步骤36，目标基站向源基站发送切换响应消息，并可以在该切换响应消息中携带用于指示所述上行资源的资源分配信息。
目标基站在所述资源分配信息中可以携带上行资源的时、频位置指示信息，其中时域位置指示信息可以是具体的频域资源生效的子帧编号，或生效的时间段(起始子帧编号和终止子帧编号或者持续时长)，或生效的起始子帧编号、周期。可选的，目标基站还可以在所述资源分配信息中携带资源结束时刻。当然，本公开实施例中目标基站可以通过其他消息向所述源基站发送所述资源分配信息。
步骤37，源基站接收到目标基站发送的切换响应消息后，向终端发送RRC连接重配消息，以进行RRC连接重配置。该RRC连接重配消息中携带步骤36中接收到的所述资源分配信息。
步骤38，终端根据上述RRC连接重配消息，建立与目标基站之间的RRC连接，切换至目标基站对应的目标小区，并利用目标基站为其分配的上行资源向目标基站发送上行数据。
请参照图4所示，本公开实施例提供的切换过程中的一种下行资源分配方法，同样应用于包括终端、源基站和目标基站的无线通信系统中，该资源分配方法包括以下步骤：
步骤41，终端进行测量上报，例如向源基站上报对服务小区以及邻小区的测量结果。
步骤42，源基站根据终端在步骤41中上报的测量结果进行切换判决，假设需要执行切换，此时确定目标小区及其归属基站。
步骤43，源基站确定待切换终端的下行缓冲区状态信息。具体的，该待切换终端的上行缓冲区状态信息，可以按照以下任一方式确定：
方式1：将所述待切换终端当前各个下行RB的缓冲区状态，作为所述待切换终端当前的下行缓冲区状态，即，直接根据终端当前各个下行RB的缓冲区状态，得到终端当前的下行缓冲区状态。
方式2：根据各RB的QoS参数，将所述待切换终端当前各个下行RB进行分组，确定各个下行RB组对应的下行缓冲区状态，作为所述待切换终端当前的下行缓冲区状态。
步骤44，源基站向目标基站发送切换请求，请求将终端切换至目标基站对应的目标小区。
本公开实施例可以在该切换请求中携带用于指示所述待切换终端当前的下行缓冲区状态的缓冲区状态指示信息。具体的，该切换请求中携带的缓冲区状态指示信息可以按照以下任一方式确定：
方式1：在所述待切换终端当前的下行缓冲区状态为所述待切换终端当前各个下行RB的缓冲区状态时，计算所述待切换终端当前各个下行RB的缓冲区状态的第二和值，将所述第二和值作为所述缓冲区状态指示信息发送给目标基站；或者，根据所述待切换终端当前各个下行RB的缓冲区状态，将部分或全部下行RB的下行缓冲区状态，作为所述缓冲区状态指示信息发送给目标基站。例如，根据QoS相关参数，将重要等级较高的部分下行RB的下行缓冲区状态发送给目标基站。
方式2：在所述待切换终端当前的下行缓冲区状态为所述待切换终端各个下行RB组对应的缓冲区状态时，计算所述待切换终端各个下行RB组对应的缓冲区状态的第三和值，将所述第三和值作为所述缓冲区状态指示信息发送给目标基站；或者，根据所述待切换终端当前各个下行RB组对应的缓冲区状态，将部分或全部下行RB组对应的下行缓冲区状态，作为所述缓冲区状态指示信息发送给目标基站。例如，根据QoS相关参数，将重要等级较高的部分下行RB组的下行缓冲区状态发送给目标基站。
步骤45，目标基站接收到源基站发送的切换请求后，进行接纳判决，如果可以接纳，那么再根据源基站在切换请求消息中携带的所述缓冲区状态指 示信息，为该切换终端分配下行资源。
例如，在所述缓冲区状态指示信息表示终端的下行缓冲区较大时，为待切换终端分配较多的下行资源，以满足传输需求；反之，在所述缓冲区状态指示信息表示终端的下行缓冲区较少时，为待切换终端分配较少的下行资源，以避免浪费资源。
需要指出的是，本公开实施例使得目标基站能够获得待切换终端的上行缓冲区状态的相关信息，进而进行合理的资源分配，本公开实施例对于对具体的资源分配方式并不作限定。
步骤46，目标基站向源基站发送切换响应消息，其中可以携带用于指示为终端分配的下行资源的资源分配信息。
目标基站向源基站发送的资源分配信息可以携带资源的时、频位置指示信息，其中时域位置指示信息可以是具体的频域资源生效的子帧编号，或生效的时间段(起始子帧编号和终止子帧编号或者持续时长)，或生效的起始子帧编号、周期。可选的，目标基站还可以在所述资源分配信息中携带资源结束时刻。当然，本公开实施例中目标基站可以通过其他消息向所述源基站发送所述资源分配信息。
步骤47，源基站接收到目标基站发送的切换响应消息后，向终端发送RRC连接重配消息，以进行RRC连接重配置。该RRC连接重配消息中携带步骤46中接收到的所述资源分配信息。
步骤48，终端根据上述RRC连接重配消息，建立与目标基站之间的RRC连接，切换至目标基站对应的目标小区，并利用目标基站为其分配的下行资源，接收目标基站发送的下行数据。
请参照图5所示，本公开实施例提供的切换过程中的上、下行资源分配方法，应用于包括终端、源基站和目标基站的无线通信系统中，该资源分配方法同时为待切换终端分配上行和下行资源，如图5所示，该方法包括以下步骤：
步骤51，终端向源基站上报测量报告。
可选的，终端可以在测量报告中携带终端当前上行缓冲区状态信息。
步骤52，基站根据终端在步骤51中上报的测量结果进行切换判决，确 定切换的目标小区及其归属基站。
步骤53，源基站确定切换终端的上行缓冲区状态信息和下行缓冲区状态信息。
这里，确定终端的上行缓冲区状态信息的方式可以参考上述步骤33中的实现，确定终端的下行缓冲区状态信息的方式可以参考上述步骤43中的实现，为节约篇幅，此处不再赘述。
步骤54，源基站向目标基站发送切换请求，请求将终端切换至目标基站对应的目标小区。该切换请求可以参考相关技术的实现。
这里，该切换请求中可以携带用于指示所述终端当前的上行缓冲区状态的第一缓冲区状态指示信息和用于指示下行缓冲区状态的第二缓冲区状态指示信息。
具体的，第一缓冲区状态指示信息可以参考上述步骤34中的实现，第二缓冲区状态指示信息可以参考上述步骤44中的实现，为节约篇幅，此处不再赘述。
步骤55，目标基站根据所述切换请求，执行接纳判决，并在允许切换时，根据所述缓冲区状态指示信息，为所述待切换终端分配对应的上行资源和下行资源。
这里，具体的上行和下行资源分配方式可以分别参考上述步骤35和步骤45中的实现方式，此处不再赘述。
步骤56，目标基站向源基站发送切换响应消息，并可以在该切换响应消息中携带用于指示所述上行资源和下行资源的资源分配信息。
类似的，资源分配信息可以包括上行/下行资源的时、频位置指示信息，其中时域位置指示信息可以是具体的频域资源生效的子帧编号，或生效的时间段(起始子帧编号和终止子帧编号或者持续时长)，或生效的起始子帧编号、周期。可选的，目标基站还可以在所述资源分配信息中携带资源结束时刻。
步骤57，源基站接收到目标基站发送的切换响应消息后，向终端发送RRC连接重配消息，以进行RRC连接重配置。该RRC连接重配消息中携带步骤56中接收到的所述资源分配信息。
步骤58，终端根据上述RRC连接重配消息，建立与目标基站之间的RRC 连接，切换至目标基站对应的目标小区，并利用目标基站为其分配的上行资源向目标基站发送上行数据，以及，利用目标基站为其分配的下行资源，接收目标基站发送的下行数据。
基于以上所述的资源分配方法，本公开实施例还提供了一种源基站，该源基站为待切换终端当前服务小区所属的基站，请参照图6，该源基站60包括：缓冲区状态确定单元61，用于确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；第一发送单元62，用于根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息；接收单元63，用于接收目标基站在根据所述缓冲区状态指示信息为所述待切换终端分配资源后返回的资源分配信息；第二发送单元64，用于向所述待切换终端发送所述资源分配信息。
可选的，所述第一发送单元62，进一步将所述缓冲区状态指示信息携带在切换请求中发送给所述目标基站；所述接收单元63，进一步从所述目标基站发送的切换响应消息中接收所述资源分配信息；以及，所述第二发送单元64，进一步将所述资源分配信息携带在RRC连接重配消息中发送给所述待切换终端。
可选的，所述缓冲区状态确定单元61包括：上行缓冲区状态确定单元，用于在所述缓冲区状态包括上行缓冲区状态时：根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，以及所述最近一次上行调度请求上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，以及所述最近一次测量报告上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态。
可选的，所述第一发送单元62包括：上行状态发送单元，用于在所述缓冲区状态包括上行缓冲区状态时：根据所述待切换终端当前的上行缓冲区状 态，确定所述待切换终端各个LCG的上行缓冲区状态，计算各个LCG的上行缓冲区状态的第一和值，向所述目标基站发送携带有所述第一和值的第一缓冲区状态指示信息；或者，根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，向所述目标基站发送携带有部分或全部LCG的上行缓冲区状态的第二缓冲区状态指示信息。
本公开实施例中，所述上行状态发送单元，在向所述目标基站发送所述第二缓冲区状态指示信息时，进一步在所述第二缓冲区状态指示信息中携带所述部分或全部LCG对应的QoS参数。
可选的，所述缓冲区状态确定单元61包括：下行缓冲区状态确定单元，用于在所述缓冲区状态包括下行缓冲区状态时：将所述待切换终端当前各个下行RB的缓冲区状态，作为所述待切换终端当前的下行缓冲区状态；或者，根据各RB的QoS参数，将所述待切换终端当前各个下行RB进行分组，确定各个下行RB组对应的下行缓冲区状态，作为所述待切换终端当前的下行缓冲区状态。
可选的，所述第一发送单元62包括：下行状态发送单元，用于在所述待切换终端当前的下行缓冲区状态为所述待切换终端当前各个下行RB的缓冲区状态时：计算所述待切换终端当前各个下行RB的缓冲区状态的第二和值，向所述目标基站发送携带有所述第二和值的第三缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB的下行缓冲区状态的第四缓冲区状态指示信息；以及，在所述待切换终端当前的下行缓冲区状态为所述待切换终端各个下行RB组对应的缓冲区状态时：计算所述待切换终端各个下行RB组对应的缓冲区状态的第三和值，向所述目标基站发送携带有所述第三和值的第五缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB组对应的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB组对应的下行缓冲区状态的第六缓冲区状态指示信息。
这里，所述下行状态发送单元在向所述目标基站发送所述第四缓冲区状态指示信息时，进一步在所述第四缓冲区状态指示信息中携带所述部分或全部下行RB对应的QoS参数；以及，在向所述目标基站发送所述第六缓冲区 状态指示信息时，进一步在所述第六缓冲区状态指示信息中携带所述部分或全部下行RB组对应的QoS参数。
本公开实施例还提供了另一种源基站，该源基站为待切换终端当前服务小区所属的基站，请参照图7，该源基站包括：第一收发机71，用于向目标基站发送用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，以及，接收目标基站在根据缓冲区状态指示信息为待切换终端分配资源后返回的资源分配信息；以及，向待切换终端发送所述资源分配信息；第一处理器72，用于确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；以及，根据所述待切换终端当前的缓冲区状态，确定用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息。
其中，在图7中，总线架构可以包括任意数量的互联的总线和桥，具体由第一处理器72代表的一个或多个处理器和第一存储器73代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。第一收发机71可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。
本公开实施例还提供了一种目标基站，该目标基站为待切换终端欲切换至的目标小区所属的基站，请参照图8，该目标基站80包括：接收单元81，用于接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；分配单元82，用于根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源；发送单元83，用于向所述源基站发送用于指示所述资源的资源分配信息。
可选的，所述接收单元81，进一步用于从所述源基站发送的切换请求中接收所述的缓冲区状态指示信息，以及，所述发送单元83，进一步用于将所述资源分配信息携带在切换响应消息中发送给所述源基站。
本公开实施例还提供了另一种目标基站，该目标基站为待切换终端欲切 换至的目标小区所属的基站，请参照图9，该目标基站包括：第二收发机91，用于接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种，以及，向所述源基站发送用于指示所述资源的资源分配信息；第二处理器92，用于根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源。
其中，在图9中，总线架构可以包括任意数量的互联的总线和桥，具体由第二处理器92代表的一个或多个处理器和第二存储器93代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。第二收发机91可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。
综上，本公开实施例提供的切换过程中的资源分配方法、源基站以及目标基站，通过在切换过程中由源基站向目标基站发送终端的上/下行缓冲区状态的相关信息，使得目标基站在切换中能够更为合理的分配资源。
以上所述是本公开的可选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (24)

  1. 一种切换过程中的资源分配方法，包括：
    源基站确定待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；
    源基站根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息；
    源基站接收目标基站在根据所述缓冲区状态指示信息为所述待切换终端分配资源后返回的资源分配信息；
    源基站向所述待切换终端发送所述资源分配信息。
  2. 如权利要求1所述的资源分配方法，其中，
    所述源基站进一步将所述缓冲区状态指示信息携带在切换请求中发送给所述目标基站；
    所述源基站进一步从所述目标基站发送的切换响应消息中接收所述资源分配信息；以及，
    所述源基站进一步将所述资源分配信息携带在无线资源控制RRC连接重配消息中发送给所述待切换终端。
  3. 如权利要求1所述的资源分配方法，其中，
    在所述缓冲区状态包括上行缓冲区状态时，所述确定待切换终端当前的缓冲区状态的步骤包括：
    根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；
    或者，根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，以及所述最近一次上行调度请求上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态；
    或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；
    或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，以及所述最近一次测量报告上报后所述待切换终端的上行调度情况，确定所 述待切换终端当前的上行缓冲区状态。
  4. 如权利要求3所述的资源分配方法，其中，
    在所述缓冲区状态包括上行缓冲区状态时，所述根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息的步骤包括：
    根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个逻辑信道组LCG的上行缓冲区状态，计算各个LCG的上行缓冲区状态的第一和值，向所述目标基站发送携带有所述第一和值的第一缓冲区状态指示信息；
    或者，根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，向所述目标基站发送携带有部分或全部LCG的上行缓冲区状态的第二缓冲区状态指示信息。
  5. 如权利要求4所述的资源分配方法，其中，
    在向所述目标基站发送所述第二缓冲区状态指示信息时，进一步在所述第二缓冲区状态指示信息中携带所述部分或全部LCG对应的服务质量QoS参数。
  6. 如权利要求1至5任一项所述的资源分配方法，其中，
    在所述缓冲区状态包括下行缓冲区状态时，所述确定待切换终端当前的缓冲区状态的步骤包括：
    将所述待切换终端当前各个下行无线承载RB的缓冲区状态，作为所述待切换终端当前的下行缓冲区状态；
    或者，根据各RB的QoS参数，将所述待切换终端当前各个下行RB进行分组，确定各个下行RB组对应的下行缓冲区状态，作为所述待切换终端当前的下行缓冲区状态。
  7. 如权利要求6所述的资源分配方法，其中，
    在所述缓冲区状态包括下行缓冲区状态时，所述根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息的步骤包括：
    在所述待切换终端当前的下行缓冲区状态为所述待切换终端当前各个下行RB的缓冲区状态时：计算所述待切换终端当前各个下行RB的缓冲区状态的 第二和值，向所述目标基站发送携带有所述第二和值的第三缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB的下行缓冲区状态的第四缓冲区状态指示信息；
    在所述待切换终端当前的下行缓冲区状态为所述待切换终端各个下行RB组对应的缓冲区状态时：计算所述待切换终端各个下行RB组对应的缓冲区状态的第三和值，向所述目标基站发送携带有所述第三和值的第五缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB组对应的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB组对应的下行缓冲区状态的第六缓冲区状态指示信息。
  8. 如权利要求7所述的资源分配方法，其中，
    在向所述目标基站发送所述第四缓冲区状态指示信息时，进一步在所述第四缓冲区状态指示信息中携带所述部分或全部下行RB对应的QoS参数；
    在向所述目标基站发送所述第六缓冲区状态指示信息时，进一步在所述第六缓冲区状态指示信息中携带所述部分或全部下行RB组对应的QoS参数。
  9. 一种切换过程中的资源分配方法，包括：
    目标基站接收源基站发送的用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；
    目标基站根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源，并向所述源基站发送用于指示所述资源的资源分配信息。
  10. 如权利要求9所述的资源分配方法，其中，
    所述目标基站进一步从所述源基站发送的切换请求中接收所述的缓冲区状态指示信息，以及，
    所述目标基站进一步将所述资源分配信息携带在切换响应消息中发送给所述源基站。
  11. 一种源基站，包括：
    缓冲区状态确定单元，用于确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；
    第一发送单元，用于根据所述待切换终端当前的缓冲区状态，向目标基站发送用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息；
    接收单元，用于接收目标基站在根据所述缓冲区状态指示信息为所述待切换终端分配资源后返回的资源分配信息；
    第二发送单元，用于向所述待切换终端发送所述资源分配信息。
  12. 如权利要求11所述的源基站，其中，
    所述第一发送单元，进一步将所述缓冲区状态指示信息携带在切换请求中发送给所述目标基站；
    所述接收单元，进一步从所述目标基站发送的切换响应消息中接收所述资源分配信息；以及，
    所述第二发送单元，进一步将所述资源分配信息携带在无线资源控制RRC连接重配消息中发送给所述待切换终端。
  13. 如权利要求11所述的源基站，其中，所述缓冲区状态确定单元包括：
    上行缓冲区状态确定单元，用于在所述缓冲区状态包括上行缓冲区状态时：
    根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；
    或者，根据待切换终端在最近一次上行调度请求中上报的上行缓冲区状态，以及所述最近一次上行调度请求上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态；
    或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，确定所述待切换终端当前的上行缓冲区状态；
    或者，根据待切换终端在最近一次测量报告中上报的上行缓冲区状态，以及所述最近一次测量报告上报后所述待切换终端的上行调度情况，确定所述待切换终端当前的上行缓冲区状态。
  14. 如权利要求13所述的源基站，其中，所述第一发送单元包括：
    上行缓冲区状态发送单元，用于在所述缓冲区状态包括上行缓冲区状态时：
    根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个 逻辑信道组LCG的上行缓冲区状态，计算各个LCG的上行缓冲区状态的第一和值，向所述目标基站发送携带有所述第一和值的第一缓冲区状态指示信息；
    或者，根据所述待切换终端当前的上行缓冲区状态，确定所述待切换终端各个LCG的上行缓冲区状态，向所述目标基站发送携带有部分或全部LCG的上行缓冲区状态的第二缓冲区状态指示信息。
  15. 如权利要求14所述的源基站，其中，
    所述上行缓冲区状态发送单元，在向所述目标基站发送所述第二缓冲区状态指示信息时，进一步在所述第二缓冲区状态指示信息中携带所述部分或全部LCG对应的服务质量QoS参数。
  16. 如权利要求11至15任一项所述的源基站，其中，所述缓冲区状态确定单元包括：
    下行缓冲区状态确定单元，用于在所述缓冲区状态包括下行缓冲区状态时：
    将所述待切换终端当前各个下行无线承载RB的缓冲区状态，作为所述待切换终端当前的下行缓冲区状态；
    或者，根据各RB的QoS参数，将所述待切换终端当前各个下行RB进行分组，确定各个下行RB组对应的下行缓冲区状态，作为所述待切换终端当前的下行缓冲区状态。
  17. 如权利要求16所述的源基站，其中，所述第一发送单元包括：
    下行缓冲区状态发送单元，用于在所述待切换终端当前的下行缓冲区状态为所述待切换终端当前各个下行RB的缓冲区状态时：计算所述待切换终端当前各个下行RB的缓冲区状态的第二和值，向所述目标基站发送携带有所述第二和值的第三缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB的缓冲区状态，向所述目标基站发送携带有部分或全部下行RB的下行缓冲区状态的第四缓冲区状态指示信息；以及，在所述待切换终端当前的下行缓冲区状态为所述待切换终端各个下行RB组对应的缓冲区状态时：计算所述待切换终端各个下行RB组对应的缓冲区状态的第三和值，向所述目标基站发送携带有所述第三和值的第五缓冲区状态指示信息；或者，根据所述待切换终端当前各个下行RB组对应的缓冲区状态，向所述目标基站发送携带有部 分或全部下行RB组对应的下行缓冲区状态的第六缓冲区状态指示信息。
  18. 如权利要求17所述的源基站，其中，
    所述下行状态发送单元在向所述目标基站发送所述第四缓冲区状态指示信息时，进一步在所述第四缓冲区状态指示信息中携带所述部分或全部下行RB对应的QoS参数；以及，在向所述目标基站发送所述第六缓冲区状态指示信息时，进一步在所述第六缓冲区状态指示信息中携带所述部分或全部下行RB组对应的QoS参数。
  19. 一种目标基站，包括：
    接收单元，用于接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；
    分配单元，用于根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源；
    发送单元，用于向所述源基站发送用于指示所述资源的资源分配信息。
  20. 如权利要求19所述的目标基站，其中，
    所述接收单元，进一步用于从所述源基站发送的切换请求中接收所述的缓冲区状态指示信息，以及，
    所述发送单元，进一步用于将所述资源分配信息携带在切换响应消息中发送给所述源基站。
  21. 一种源基站，包括：处理器，存储器和收发机；其中
    所述存储器存储有能够被所述处理器执行的计算机可读指令，在所述计算机可读指令被执行时，所述处理器用于：
    通过收发机，向目标基站发送用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，以及，接收目标基站在根据缓冲区状态指示信息为待切换终端分配资源后返回的资源分配信息；以及，向待切换终端发送所述资源分配信息；以及
    确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；以及，根据所述待切换终端当前的缓冲区状态，确定用于指示所述待切换终端当前的缓冲区状态的缓冲 区状态指示信息。
  22. 一种目标基站，包括：处理器，存储器和收发机；其中
    所述存储器存储有能够被所述处理器执行的计算机可读指令，在所述计算机可读指令被执行时，所述处理器用于：
    通过收发机，接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种，以及，向所述源基站发送用于指示所述资源的资源分配信息；以及
    根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源。
  23. 一种非易失性计算机存储媒介，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器：
    向目标基站发送用于指示待切换终端当前的缓冲区状态的缓冲区状态指示信息，以及，接收目标基站在根据缓冲区状态指示信息为待切换终端分配资源后返回的资源分配信息；以及，向待切换终端发送所述资源分配信息；以及
    确定执行切换的待切换终端当前的缓冲区状态，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种；以及，根据所述待切换终端当前的缓冲区状态，确定用于指示所述待切换终端当前的缓冲区状态的缓冲区状态指示信息。
  24. 一种非易失性计算机存储媒介，存储有能够被处理器执行的计算机可读指令，当所述计算机可读指令被处理器执行时，所述处理器：
    接收源基站发送的用于指示执行切换的待切换终端当前的缓冲区状态的缓冲区状态指示信息，所述缓冲区状态包括上行缓冲区状态和下行缓冲区状态中的至少一种，以及，向所述源基站发送用于指示所述资源的资源分配信息；以及
    根据所述缓冲区状态指示信息，为所述待切换终端分配对应的资源。
PCT/CN2017/076258 2016-04-01 2017-03-10 一种切换过程中的资源分配方法、源基站及目标基站 Ceased WO2017166989A1 (zh)

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