WO2016183816A1 - 通信方法和设备 - Google Patents

通信方法和设备 Download PDF

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Publication number
WO2016183816A1
WO2016183816A1 PCT/CN2015/079353 CN2015079353W WO2016183816A1 WO 2016183816 A1 WO2016183816 A1 WO 2016183816A1 CN 2015079353 W CN2015079353 W CN 2015079353W WO 2016183816 A1 WO2016183816 A1 WO 2016183816A1
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WO
WIPO (PCT)
Prior art keywords
cell
user equipment
base station
uplink synchronization
indication information
Prior art date
Application number
PCT/CN2015/079353
Other languages
English (en)
French (fr)
Inventor
张宏平
曾清海
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201580062957.1A priority Critical patent/CN107005957B/zh
Priority to EP15892195.7A priority patent/EP3280199B1/en
Priority to PCT/CN2015/079353 priority patent/WO2016183816A1/zh
Publication of WO2016183816A1 publication Critical patent/WO2016183816A1/zh
Priority to US15/816,665 priority patent/US10172106B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • 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
    • H04W36/249—Reselection being triggered by specific parameters according to timing information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a communication method and device.
  • the DC technology supports carrier aggregation (Carrier Aggregation (CA) for multiple cells under two base stations).
  • CA Carrier Aggregation
  • MeNB primary base station
  • SeNB secondary base station
  • the UE is required to connect to the cells under the two base stations.
  • the primary base station and the secondary base station can transmit user data, and the primary base station needs to bear more control functions, such as: Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • the macro base station needs to be the primary base station, and the small base station is used as the secondary base station.
  • the DC technology requires the UE to communicate at the primary base station (macro base station), which is disadvantageous for the UE.
  • the UE must have the capability of Carrier Aggregation (CA), that is, it can support both the uplink CA and the downlink CA, otherwise the DC cannot be used. Therefore, for a UE that does not support DC, after it enters the coverage of the small base station, it quickly removes the coverage of the small base station, which causes frequent transitions of the UE, resulting in a long interruption of data transmission, resulting in users. The experience is poor.
  • CA Carrier Aggregation
  • the embodiments of the present invention provide a communication method and device, which are used to reduce the time for data transmission interruption caused by UE switching between cells, thereby improving user experience.
  • an embodiment of the present invention provides a communication method, including:
  • the user equipment receives the indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with the first cell controlled by the first base station;
  • the user equipment When the user equipment is in uplink synchronization with the first cell according to the indication information, the user equipment is in a radio resource control RRC connected state, and the serving cell of the user equipment is a second cell controlled by the second base station;
  • the user equipment is switched from the second cell to the first cell that is in uplink synchronization with the user equipment, and performs communication based on the first cell.
  • the user equipment receives the indication information, including:
  • the first handover message sent by the first base station, where the first handover message is used to indicate that the user equipment is handed over from the first cell to the second cell, the first handover message
  • the indication information is included.
  • the user equipment receives the indication information, including:
  • the user equipment receives the indication information sent by the second base station.
  • the method further includes:
  • the user equipment sends an uplink signal to the first base station according to the indication information, so that the first base station acquires a time advance TA or TA offset value of the user equipment according to the uplink signal;
  • the uplink signal includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the indication information includes the following information At least one of: sounding reference signal configuration information, random access preamble information, SR configuration information, The uplink synchronization gap configuration information, the cell radio network temporary identifier C-RNTI of the user equipment allocated by the first base station in the first cell.
  • the fifth possible implementation manner of the fifth aspect in a sixth possible implementation manner of the first aspect, is switched to the first cell that is in uplink synchronization with the user equipment, and specifically includes:
  • the user equipment If the radio link fails between the user equipment and the second cell, or the user equipment receives the second handover message sent by the second base station, the user equipment is switched from the second cell to the second cell The first cell that maintains uplink synchronization with the user equipment; wherein the second handover message is used to indicate that the user equipment is handed over from the second cell to the first cell.
  • the first aspect of the first aspect the sixth possible implementation manner of the first aspect, the seventh possible implementation manner of the first aspect,
  • the user equipment sends an SR message to the first base station by using the first cell, where the SR message is used to request the first base station to perform data scheduling on the user equipment.
  • an embodiment of the present invention provides a communication method, including:
  • the first base station sends a first handover message to the user equipment, where the first handover message is used to indicate that the user equipment is handed over from the first cell controlled by the first base station to the second cell controlled by the second base station;
  • the message includes the indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with the first cell;
  • the first base station performs communication with the user equipment based on the first cell when the user equipment is switched from the second cell to the first cell that is in uplink synchronization with the user equipment.
  • the method further includes:
  • the first base station receives, according to the first cell, an uplink signal that is sent by the user equipment according to the indication information, and acquires a time advance TA or TA offset value of the user equipment according to the uplink signal;
  • the TA or TA offset value is used to enable the user equipment to establish and/or maintain the user equipment and the first cell Uplink synchronization between.
  • the uplink signal includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the method further includes:
  • the first base station After the user equipment switches from the first cell to the second cell, the first base station saves context information of the user equipment.
  • the indication information includes the following information At least one of the sounding reference signal configuration information, the random access preamble information, the SR configuration information, the uplink synchronization gap configuration information, and the cell wireless network temporary identifier of the user equipment allocated by the first base station in the first cell C-RNTI.
  • the method further includes:
  • the first base station sends a third handover message to the second base station, where the third handover message is used to request the second base station to allow the user equipment to switch from the first cell to the second cell.
  • the first base station receives a handover response message returned by the second base station according to the third handover message.
  • the third handover message includes at least one of the following information: sounding reference signal configuration information, scheduling request SR Configuration information and uplink synchronization gap configuration information.
  • an embodiment of the present invention provides a communication method, including:
  • the second base station sends the indication information to the user equipment, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with the first cell controlled by the first base station, so that when a transition occurs,
  • the user equipment is switched from a second cell controlled by the second base station to the first cell that is in uplink synchronization with the user equipment.
  • the indication information includes at least one of the following: the sounding reference signal configuration information, the random access preamble information, the SR configuration information, and the uplink synchronization gap.
  • the method further includes:
  • the second base station sends a handover message to the user equipment, where the handover message is used to switch the user equipment from the second cell to the first cell that maintains uplink synchronization with the user equipment.
  • the second base station is configured to the user equipment Before sending the indication information, the method further includes:
  • the second base station receives a response message sent by the first base station according to the request message.
  • an embodiment of the present invention provides a user equipment, including:
  • a receiving unit configured to receive indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with a first cell controlled by the first base station;
  • a processing unit configured to switch from the second cell to the first cell that is in uplink synchronization with the user equipment, and perform communication based on the first cell;
  • the user equipment When the user equipment is in uplink synchronization with the first cell according to the indication information, the user equipment is in a radio resource control RRC connected state, and the serving cell of the user equipment is a second base station controlled second. Community.
  • the receiving unit is specifically configured to:
  • the first base station Receiving, by the first base station, the first handover message, where the first handover message is used to indicate that the user equipment is handed over from the first cell to the second cell, where the first handover message includes the indication information.
  • the receiving unit is specifically configured to:
  • the user equipment further includes: a sending unit ;among them,
  • the sending unit is configured to send an uplink signal to the first base station according to the indication information, where So that the first base station acquires a timing advance TA or TA offset value of the user equipment according to the uplink signal;
  • the receiving unit is further configured to receive the TA or TA offset value that is sent by the first base station or the first base station by using the second base station;
  • the processing unit is configured to establish and/or maintain uplink synchronization of the user equipment and the first cell according to the TA or TA offset value.
  • the uplink signal sent by the sending unit includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the indication information received by the receiving unit includes At least one of the following information: the sounding reference signal configuration information, the random access preamble information, the SR configuration information, the uplink synchronization gap configuration information, and the cell radio of the user equipment allocated by the first base station in the first cell
  • the network temporarily identifies the C-RNTI.
  • the receiving unit is further configured to receive a second handover message sent by the second base station;
  • the processing unit is specifically configured to:
  • the receiving unit receives the second handover message sent by the second base station, switching from the second cell to the The first cell that the user equipment maintains uplink synchronization; wherein the second handover message is used to indicate that the user equipment is handed over from the second cell to the first cell.
  • the sending unit is further configured to pass The first cell sends an SR message to the first base station, where the SR message is used to request the first base station to perform data scheduling on the user equipment.
  • an embodiment of the present invention provides a base station, including:
  • a sending unit configured to send a first handover message to the user equipment, where the first handover message is used to indicate that the user equipment is switched from a first cell controlled by the first base station to a second cell controlled by the second base station;
  • the switch message includes the indication information, where the indication information is used to indicate the user.
  • the processing unit is configured to perform communication with the user equipment based on the first cell when the user equipment is switched from the second cell to the first cell that is in uplink synchronization with the user equipment.
  • the base station further includes: a receiving unit;
  • the receiving unit is configured to receive, according to the first cell, an uplink signal sent by the user equipment according to the indication information, and acquire, according to the uplink signal, a timing advance TA or TA offset value of the user equipment;
  • the sending unit is further configured to send the TA or TA offset value to the user equipment, where the TA or TA offset value is used to enable the user equipment to establish and/or maintain the user equipment and the Uplink synchronization of the first cell.
  • the uplink signal received by the receiving unit includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the base station further includes: a saving unit ;among them,
  • the saving unit is configured to save context information of the user equipment after the user equipment switches from the first cell to the second cell.
  • the indication information sent by the sending unit At least one of the following information: the sounding reference signal configuration information, the random access preamble information, the SR configuration information, the uplink synchronization gap configuration information, and the cell allocated by the first base station in the first cell
  • the wireless network temporarily identifies the C-RNTI.
  • the sending unit is further used Sending, to the second base station, a third handover message, where the third handover message is used to request the second base station to allow establishment and/or after the user equipment switches from the first cell to the second cell Maintaining uplink synchronization with the first cell;
  • the receiving unit is further configured to receive a handover response message that is returned by the second base station according to the third handover message.
  • the third switching message that is sent by the sending unit includes at least one of the following information: sounding reference signal configuration information The scheduling request SR configuration information and the uplink synchronization gap configuration information.
  • the present invention provides a base station, including:
  • a sending unit configured to send, to the user equipment, indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with a first cell controlled by the first base station, so that when a transition occurs And the user equipment is switched from the second cell controlled by the second base station to the first cell that is in uplink synchronization with the user equipment.
  • the indication information that is sent by the sending unit includes at least one of the following information: sounding reference signal configuration information, random access preamble information, and SR configuration information.
  • the sending unit is further configured to send a handover message to the user equipment,
  • the handover message is used to cause the user equipment to switch from the second cell to the first cell that maintains uplink synchronization with the user equipment.
  • the base station further includes: a receiving unit ;among them,
  • the sending unit is further configured to send a request message to the first base station, where the request message is used to request the first cell to allow the user equipment to establish and/or maintain uplink synchronization with the first cell;
  • the receiving unit is further configured to receive a response message that is sent by the first base station according to the request message.
  • the seventh aspect of the present invention provides a user equipment, including:
  • a receiver configured to receive indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with a first cell controlled by the first base station;
  • a processor configured to switch from the second cell to an uplink synchronization with the user equipment Determining a first cell and performing communication based on the first cell;
  • the user equipment When the user equipment is in uplink synchronization with the first cell according to the indication information, the user equipment is in a radio resource control RRC connected state, and the serving cell of the user equipment is a second base station controlled second. Community.
  • the receiver is specifically configured to:
  • the first base station Receiving, by the first base station, the first handover message, where the first handover message is used to indicate that the user equipment is handed over from the first cell to the second cell, where the first handover message includes the indication information.
  • the receiver is configured to: receive the indication information that is sent by the second base station.
  • the user equipment further includes: sending Where;
  • the transmitter is configured to send an uplink signal to the first base station according to the indication information, so that the first base station acquires a time advance TA or TA offset value of the user equipment according to the uplink signal;
  • the receiver is further configured to receive the TA or TA offset value sent by the first base station or the first base station by using the second base station;
  • the processor is further configured to establish and/or maintain uplink synchronization of the user equipment and the first cell according to the TA or TA offset value.
  • the uplink signal sent by the transmitter includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the indication information received by the receiver At least one of the following information: the sounding reference signal configuration information, the random access preamble information, the SR configuration information, the uplink synchronization gap configuration information, and the cell allocated by the first base station in the first cell
  • the wireless network temporarily identifies the C-RNTI.
  • the receiver is further configured to receive a second handover message sent by the second base station;
  • the processor is further configured to: if a radio link failure occurs between the user equipment and the second cell, or the receiver receives a second handover message sent by the second base station, from the The second cell is switched to the first cell that is in uplink synchronization with the user equipment; wherein the second handover message is used to indicate that the user equipment is handed over from the second cell to the first cell.
  • the transmitter is further configured to send an SR message to the first base station by using the first cell, where the SR message is used to request the first base station to perform data scheduling on the user equipment.
  • an embodiment of the present invention provides a base station, including:
  • a transmitter configured to send a first handover message to the user equipment, where the first handover message is used to indicate that the user equipment is switched from a first cell controlled by the first base station to a second cell controlled by the second base station;
  • the handover message includes the indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization between the user equipment and the first cell;
  • a processor configured to perform communication with the user equipment based on the first cell when the user equipment is switched from the second cell to the first cell that is in uplink synchronization with the user equipment.
  • the base station further includes: a receiver
  • the receiver is configured to receive, according to the first cell, an uplink signal sent by the user equipment according to the indication information, and acquire, according to the uplink signal, a timing advance TA or TA offset value of the user equipment;
  • the transmitter is further configured to send the TA or TA offset value to the user equipment, where the TA or TA offset value is used to enable the user equipment to establish and/or maintain the user equipment and the Uplink synchronization between the first cells.
  • the uplink signal received by the receiver includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the base station further includes: a memory; among them,
  • the memory is configured to save context information of the user equipment after the user equipment switches from the first cell to the second cell.
  • the indication information sent by the transmitter At least one of the following information: the sounding reference signal configuration information, the random access preamble information, the SR configuration information, the uplink synchronization gap configuration information, and the cell allocated by the first base station in the first cell
  • the wireless network temporarily identifies the C-RNTI.
  • the fourth any one of the first aspect of the eighth aspect, the fourth possible implementation manner of the eighth aspect Sending, to the second base station, a third handover message, where the third handover message is used to request the second base station to allow establishment and/or after the user equipment switches from the first cell to the second cell Maintaining uplink synchronization with the first cell;
  • the receiver is further configured to receive a handover response message that is returned by the second base station according to the third handover message.
  • the third switching message that is sent by the transmitter includes at least one of the following information: sounding reference signal configuration information The scheduling request SR configuration information and the uplink synchronization gap configuration information.
  • a ninth aspect, the embodiment of the present invention provides a base station, including:
  • a transmitter configured to send indication information to the user equipment, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with a first cell controlled by the first base station, so that when a transition occurs And the user equipment is switched from the second cell controlled by the second base station to the first cell that is in uplink synchronization with the user equipment.
  • the indication information sent by the transmitter includes at least one of the following information: sounding reference signal configuration information, random access preamble information, and SR configuration information.
  • the transmitter is further configured to send a handover message to the user equipment,
  • the handover message is used to switch the user equipment from the second cell to the user equipment The first cell holding uplink synchronization.
  • the base station further includes: a receiver ;among them,
  • the transmitter is further configured to send a request message to the first base station, where the request message is used to request the first cell to allow the user equipment to establish and/or maintain uplink synchronization with the first cell;
  • the receiver is further configured to receive a response message that is sent by the first base station according to the request message.
  • the communication method and device provided by the present invention receive the indication information, and when the UE is in uplink synchronization with the first cell according to the indication information, the UE is in the RRC connection state of the radio resource control, and the serving cell of the UE is controlled by the second base station. In the second cell, the UE transits from the second cell to the first cell that is in uplink synchronization with the UE, and performs communication based on the first cell.
  • the UE Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission based on the second cell, when the UE needs to perform communication based on the first cell, the UE may need to perform a random access procedure to quickly go to the first The cell reduces the data transmission interruption time caused by the UE switching between cells, thereby improving the user experience.
  • Embodiment 1 is a schematic flowchart of Embodiment 1 of a communication method according to the present invention
  • Embodiment 2 is a schematic flowchart of Embodiment 2 of a communication method according to the present invention
  • Embodiment 3 is a schematic flowchart of Embodiment 3 of a communication method according to the present invention.
  • Embodiment 4 is a schematic flowchart of Embodiment 4 of a communication method according to the present invention.
  • Embodiment 5 is a schematic flowchart of Embodiment 5 of a communication method according to the present invention.
  • Embodiment 6 is a schematic signaling diagram of Embodiment 6 of a communication method according to the present invention.
  • FIG. 7 is a schematic flowchart diagram of Embodiment 7 of a communication method according to the present invention.
  • Embodiment 8 is a schematic flowchart of Embodiment 8 of a communication method according to the present invention.
  • Embodiment 9 is a schematic signaling diagram of Embodiment 9 of a communication method according to the present invention.
  • Embodiment 1 of a user equipment according to the present invention is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • Embodiment 11 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention.
  • Embodiment 1 of a base station is a schematic structural diagram of Embodiment 1 of a base station according to the present invention.
  • Embodiment 13 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention.
  • Embodiment 3 of a base station according to the present invention is a schematic structural diagram of Embodiment 3 of a base station according to the present invention.
  • Embodiment 4 of a base station according to the present invention is a schematic structural diagram of Embodiment 4 of a base station according to the present invention.
  • FIG. 16 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • Embodiment 17 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention.
  • Embodiment 1 of a base station is a schematic structural diagram of Embodiment 1 of a base station according to the present invention.
  • Embodiment 19 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention.
  • Embodiment 3 of a base station according to the present invention is a schematic structural diagram of Embodiment 3 of a base station according to the present invention.
  • FIG. 21 is a schematic structural diagram of Embodiment 4 of a base station according to the present invention.
  • the method provided by the embodiment of the present invention can be used in a wireless network of different standards, for example, Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA). CDMA2000, Wideband Code Division Multiple Access (WCDMA), Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), Long Term Evolution (Long Term Evolution, LTE) system or a subsequent evolution system of LTE, and the like.
  • GSM Global System for Mobile Communication
  • CDMA Code Division Multiple Access
  • CDMA2000 Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • FIG. 1 is a schematic flowchart diagram of Embodiment 1 of a communication method according to the present invention.
  • the embodiment of the invention provides a communication method, which can be performed by any device that performs a communication method, and the device can pass Implemented in software and / or hardware.
  • the device can be integrated in the UE.
  • the method in this embodiment may include:
  • Step 101 The user equipment receives the indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with the first cell controlled by the first base station.
  • the indication information may be used only to indicate that the UE establishes uplink synchronization with the first cell controlled by the first base station, or only to indicate that the UE maintains uplink synchronization with the first cell controlled by the first base station. It can also be used to instruct the UE to establish and maintain uplink synchronization with the first cell controlled by the first base station.
  • the first base station may be, for example, a macro base station.
  • Step 102 When the user equipment is in uplink synchronization with the first cell according to the indication information, the user equipment is in a radio resource control RRC connection state, and the serving cell of the user equipment is a second cell controlled by the second base station.
  • the UE after receiving the indication information, the UE establishes and/or maintains uplink synchronization with the first cell according to the indication information. It should be noted that, in this step, when the UE is in uplink synchronization with the first cell, the UE is in an RRC connected state, and the first cell is not the serving cell of the UE, and the serving cell of the UE is controlled by the second base station. Two cells.
  • the second base station may be, for example, a small base station.
  • Step 103 The user equipment transits from the second cell to the first cell that is in uplink synchronization with the user equipment, and performs communication based on the first cell.
  • the uplink can be directly converted to the first cell according to the uplink synchronization with the first cell, and the data and signaling are transmitted based on the first cell.
  • first base station and the second base station may be the same base station or different base stations.
  • the UE is a different cell under the same base station. Convert between.
  • the communication method provided by the embodiment of the present invention when receiving the indication information, when the UE is in uplink synchronization with the first cell according to the indication information, the UE is in the RRC connection state of the radio resource control, and the serving cell of the UE is the second control by the second base station.
  • the UE transits from the second cell to the first cell that is in uplink synchronization with the UE, and performs communication based on the first cell.
  • the UE Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission based on the second cell, when the UE needs to be based on the first When the cell performs communication, it can quickly go to the first cell without performing a random access procedure, which reduces the data transmission interruption time caused by the UE switching between cells, thereby improving the user experience.
  • FIG. 2 is a schematic flowchart of a second embodiment of a communication method according to the present invention.
  • the method in this embodiment may include:
  • Step 201 The user equipment receives the first handover message sent by the first base station, where the first handover message is used to indicate that the user equipment is handed over from the first cell to the second cell, and the first handover message includes indication information.
  • the UE establishes an initial connection with the first cell controlled by the first base station.
  • the first base station is a macro base station, and the coverage thereof is large, so that the power consumption of the UE when performing data communication under the first base station is large, therefore, the UE A measurement task is configured to find a second cell that satisfies the measurement trigger condition, where the second cell that satisfies the measurement trigger condition is a cell under the small base station with better signal quality.
  • the UE may measure the value of the reference signal receiving power (RSRP) of each cell, and determine whether the value is greater than a preset threshold.
  • RSRP reference signal receiving power
  • the RSRP is specified.
  • the cell corresponding to the value satisfies the measurement trigger condition.
  • the preset threshold may be set according to an actual situation. The specific value of the preset threshold is not limited in the present invention.
  • the second base station returns a handover response message to the first base station according to the received third handover message carrying the request information.
  • the first base station sends a first handover message to the UE according to the handover response message, where the first handover message includes indication information, where the indication information is used to indicate that the UE switches from the first cell controlled by the first base station to the second
  • the second cell controlled by the base station has a small coverage because the second base station is a small base station. Therefore, when the UE performs data transmission in the second base station, power saving can be achieved.
  • the first base station after the first base station sends the first handover message to the UE, the first base station still retains the context information of the UE, and after the subsequent UE returns to the first base station, can communicate with the UE based on the context information.
  • the UE after receiving the first handover message, the UE also retains the current UE context information, and after the subsequent UE returns to the first base station, can communicate with the first base station based on the context information.
  • the UE switches from the first cell controlled by the first base station to the second cell controlled by the second base station, the data is sent from the serving gateway to the first base station to the second base station.
  • the second base station is a small base station with a small coverage, the UE may quickly return to the first base station, so that the data path is frequently switched, thereby increasing signaling overhead and complexity.
  • the present invention during handover of the UE from the first cell controlled by the first base station to the second cell controlled by the second base station, data is still sent from the serving gateway to the first base station, and the first base station receives these The data is sent to the second base station, so that when the UE returns to the first base station, the corresponding service gateway to the base station is not required to perform data path switching, so as to avoid frequent data path switching and reduce corresponding signaling overhead and complexity.
  • Step 202 The user equipment sends an uplink signal to the first base station according to the indication information, so that the first base station acquires the time advance TA or TA offset value of the user equipment according to the uplink signal.
  • the second cell is a serving cell of the UE, and the first cell is no longer a serving cell of the UE.
  • the uplink signal includes a random access preamble signal or a sounding reference signal or a Scheduling Request (SR) signal.
  • SR Scheduling Request
  • the UE needs to send an uplink signal to the first base station periodically or irregularly, that is, send an uplink signal on the first cell.
  • the indication information may include one or more of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and a cell allocated by the first base station in the first cell.
  • C-RNTI Cell Radio Network Temporary Identifier
  • the sounding reference signal configuration information is used to enable the UE to learn on which resources the sounding reference signal is sent to the first cell to establish and/or maintain uplink synchronization;
  • the random access preamble information is used to enable the UE to learn to initiate the random access channel ( Random Access Channel (referred to as RACH), which random access preamble resource is used, that is, the first base station allocates and reserves a dedicated random access preamble resource to the UE; the UE allocated by the first base station is in the first cell.
  • RACH Random Access Channel
  • the RNTI is used to enable the UE to access the first cell.
  • the indication information may further include SR configuration information, which is used to indicate that the UE is switched from the second cell to the first cell. After the cell, the SR requesting data scheduling is sent to the first cell by using the SR resource indicated by the SR configuration information.
  • the SR configuration information is further used to notify the first cell that the UE has been switched from the second cell to the first cell; further, The UE may not support the uplink CA, so when the UE performs uplink synchronization with the first base station during data transmission by the second base station, an upper is required.
  • the uplink synchronization gap is used to indicate that the UE sends an uplink signal to the first cell during the uplink synchronization gap. Therefore, the indication information may further include: uplink synchronization gap configuration information.
  • the uplink synchronization gap configuration information in the indication information may be determined by the first base station and carried in the third handover message to the second base station to notify the second base station UE when the second cell can be received.
  • Downlink data when the downlink data sent by the second cell cannot be received; the uplink synchronization gap configuration information may also be determined by the second base station and carried in the handover response message and sent to the first base station.
  • the uplink synchronization gap configuration information may not be included in the indication information, but the UE transmits the sounding reference signal to the first cell during the time period in which the resource indicated in the sounding reference signal configuration information is located, and the second The base station does not schedule downlink data of the UE during the time period in which the resource is located.
  • the first base station may carry the sounding reference signal configuration information in the third handover message. Send to the second base station.
  • the UE If the UE does not support the uplink CA, the UE sends an uplink signal during the uplink synchronization gap or during the time period in which the resource indicated in the sounding reference signal configuration information is located, and the second base station does not schedule the UE during the uplink signal transmission by the UE.
  • the first base station After the UE sends an uplink signal to the first base station according to the indication information, the first base station acquires a Timing Advance (TA) or a TA offset value of the UE according to the received uplink signal.
  • TA Timing Advance
  • Step 203 The user equipment receives a TA or TA offset value sent by the first base station or the first base station by using the second base station, and establishes and/or maintains uplink synchronization between the UE and the first cell according to the TA or TA offset value.
  • the TA or TA offset value may be directly sent to the UE by using the first cell, or the TA or TA offset value may be first
  • the method is sent to the second base station, and then forwarded to the UE by the second base station.
  • the specific transmission manner of the TA or TA offset value is not limited in the present invention.
  • Step 204 The user equipment transits from the second cell to the first cell that is in uplink synchronization with the user equipment, and performs communication based on the first cell.
  • the UE if the radio link fails between the UE and the second cell, or the UE receives the second cell that is sent by the second base station and is used to instruct the UE to control from the second base station to switch to the first base station control. After the second handover message of the first cell, the UE needs to return to the first cell for data transmission. At this time, the UE does not need to initiate a random access procedure to the first cell according to its uplink synchronization with the first cell. The second cell controlled by the second base station is quickly switched to the first cell controlled by the first base station.
  • Step 205 The user equipment sends an SR message to the first base station by using the first cell, where the SR message is used to request the first base station to perform data scheduling on the user equipment.
  • the UE after the UE is switched from the second cell to the first cell, the UE sends an SR message to the first base station according to the first cell, to request the first base station to perform data scheduling on the UE, or notify the first base station, The UE has returned to the first cell for data transmission.
  • the communication method provided by the embodiment of the present invention when receiving the indication information, when the UE is in uplink synchronization with the first cell according to the indication information, the UE is in the RRC connection state of the radio resource control, and the serving cell of the UE is the second control by the second base station.
  • the UE transits from the second cell to the first cell that is in uplink synchronization with the UE, and performs communication based on the first cell. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission based on the second cell, when the UE needs to communicate through the first cell, the UE may quickly go to the first manner without performing a random access procedure.
  • the cell reduces the data transmission interruption time caused by the UE switching between cells, thereby improving the user experience.
  • the power consumption of the UE can be reduced, and interference to other UEs can be reduced, and when the UE and the second cell After the radio link fails, or the UE receives the second handover message sent by the second base station to indicate that the UE switches from the second cell controlled by the second base station to the first cell controlled by the first base station, the UE may not need to The random access procedure is initiated to go to the first cell for communication, which reduces the time for data interruption, thereby improving the user experience.
  • FIG. 3 is a schematic flowchart of a third embodiment of a communication method according to the present invention.
  • the method in this embodiment may include:
  • Step 301 The user equipment receives the indication information sent by the second base station.
  • the UE establishes an initial connection with the second cell controlled by the second base station, that is, the second cell is the current serving cell of the UE, and the first cell controlled by the first base station is not the serving cell of the UE, because the second base station The coverage is small. After the UE enters the coverage of the small base station, it is likely that the coverage of the small base station is removed again. At this time, the UE frequently switches between cells, which increases the time for data interruption. Moreover, the probability of switching failure is increased.
  • the second base station after the UE establishes an initial connection with the second cell controlled by the second base station, the second base station sends a request message to the first base station to request the first base station to allow the UE to establish and/or maintain control with the first base station.
  • the request message may be, for example, an uplink synchronization request message.
  • the request message carries the context information of the UE, so that the subsequent UE can communicate with the first base station based on the context information after being transferred to the first base station.
  • the first base station returns a response message to the second base station according to the received request message, where the request message carries the C-RNTI allocated by the first base station to the UE on the first cell, and after receiving the response message, the second base station sends the response message to the UE. Send instructions.
  • Step 302 The user equipment sends an uplink signal to the first base station according to the indication information, so that the first base station acquires the time advance TA or TA offset value of the user equipment according to the uplink signal.
  • Step 303 The user equipment receives a TA or TA offset value sent by the first base station or the first base station by using the second base station, and establishes and/or maintains uplink synchronization between the user equipment and the first cell according to the TA or TA offset value.
  • Step 304 The user equipment transits from the second cell to the first cell that is in uplink synchronization with the user equipment, and performs communication based on the first cell.
  • Step 305 The user equipment sends an SR message to the first base station by using the first cell, where the SR message is used to request the first base station to perform data scheduling on the user equipment.
  • Step 302-step 305 is similar to step 202-step 205, and details are not described herein again.
  • the communication method provided by the embodiment of the present invention when receiving the indication information, when the UE is in uplink synchronization with the first cell according to the indication information, the UE is in the RRC connection state of the radio resource control, and the serving cell of the UE is the second control by the second base station.
  • the UE transits from the second cell to the first cell that is in uplink synchronization with the UE, and performs communication based on the first cell. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission based on the second cell, when the UE needs to communicate through the first cell, the UE may quickly go to the first manner without performing a random access procedure.
  • the cell reduces the data transmission interruption time caused by the UE switching between cells, thereby improving the user experience.
  • the radio link fails between the UE and the second cell, or the UE receives the first cell sent by the second base station to indicate that the UE is switched from the second cell controlled by the second base station to the first cell controlled by the first base station.
  • the UE can go to the first cell to perform communication without initiating a random access procedure, which reduces the time for data interruption, thereby improving the user experience.
  • FIG. 4 is a schematic flowchart diagram of Embodiment 4 of a communication method according to the present invention.
  • An embodiment of the present invention provides a A communication method, which may be performed by any device that performs a communication method, and the device may be implemented by software and/or hardware.
  • the device can be integrated in the base station.
  • the method in this embodiment may include:
  • Step 401 The first base station sends a first handover message to the user equipment, where the first handover message is used to indicate that the user equipment is handed over from the first cell controlled by the first base station to the second cell controlled by the second base station; the first handover message includes an indication.
  • the information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with the first cell.
  • the UE if the UE establishes an initial connection with the first cell controlled by the first base station, that is, when the first cell is the current serving cell of the UE, the first base station is a macro base station, and the coverage thereof is large, so that the UE is in the UE.
  • the first base station performs data communication, the power consumption is large. Therefore, the UE is configured to perform a measurement task to find a second cell that meets the measurement trigger condition, where the second cell that satisfies the measurement trigger condition has better signal quality.
  • the UE may measure the RSRP value of each cell, and determine whether the value is greater than a preset threshold.
  • the cell corresponding to the RSRP value meets the measurement trigger condition.
  • the preset threshold may be set according to an actual situation. The specific value of the preset threshold is not limited in the present invention.
  • the UE Transmitting, by the UE, the first handover message carrying the indication information, to enable the UE to switch from the first cell controlled by the first base station to the second cell controlled by the second base station, including initiating a random access procedure, etc., wherein the indication information is used for Instructing the UE to establish and/or maintain uplink synchronization with the first cell after the handover is completed.
  • the indication information is used for Instructing the UE to establish and/or maintain uplink synchronization with the first cell after the handover is completed.
  • the first base station after the first base station sends the first handover message carrying the indication information to the UE, the first base station still retains the context information of the UE, and can be based on the context information after the subsequent UE returns to the first base station. The UE communicates with the UE. Similarly, after receiving the first handover message carrying the indication information, the UE also retains the current UE context information, and after the subsequent UE returns to the first base station, can communicate with the first base station based on the context information. .
  • the UE switches from the first cell controlled by the first base station to the second base station control After the second cell, data is sent from the serving gateway to the first base station to the second base station.
  • the second base station is a small base station with a small coverage
  • the UE may quickly return to the first base station, and the data path switching is performed frequently, which increases signaling overhead and complexity.
  • the UE when the UE switches from the first cell controlled by the first base station to the second cell controlled by the second base station, data is still sent from the serving gateway to the first base station, and the first base station receives these The data is sent to the second base station, so that when the UE returns to the first base station, the corresponding data path switching between the serving gateway and the base station is not needed, so as to avoid frequent data path switching and reduce corresponding signaling overhead and complexity.
  • Step 402 The first base station performs communication with the user equipment based on the first cell when the user equipment is switched from the second cell to the first cell that is in uplink synchronization with the user equipment according to the user equipment.
  • the UE after the UE is switched from the second cell to the first cell, the UE sends an SR message to the first base station on the first cell, to request the first base station to perform data scheduling on the UE, thereby performing data communication. .
  • the communication method by sending a first handover message to the UE, to enable the UE to switch from the first cell controlled by the first base station to the second cell controlled by the second base station, and to switch from the second cell to the UE
  • the first cell communicates with the UE. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission through the second cell, the UE can quickly go to the first cell for communication without performing a random access procedure, thereby reducing the UE.
  • the data transmission interruption time caused by switching between cells improves the user experience.
  • FIG. 5 is a schematic flowchart of Embodiment 5 of a communication method according to the present invention.
  • the method in this embodiment may include:
  • Step 501 The first base station sends a third handover message to the second base station, where the third handover message is used to request the second base station to allow the user equipment to establish and/or maintain the first cell after the user equipment switches from the first cell to the second cell.
  • Uplink synchronization is used to request the second base station to allow the user equipment to establish and/or maintain the first cell after the user equipment switches from the first cell to the second cell.
  • the first base station decides to switch the UE to the second base station to perform communication according to the measurement report sent by the UE.
  • the first base station sends a third handover message to the second base station, where the third handover message carries request information, where the request information is used to request the second base station to allow the UE.
  • Uplink synchronization with the first cell is established and/or maintained after handover from the first cell to the second cell.
  • the third handover message includes one or more of the following: sounding reference signal configuration information, scheduling request SR configuration information, and uplink synchronization gap configuration information.
  • the sounding reference signal configuration information is used to enable the UE to learn on which resources the sounding reference signal is sent to the first cell to establish and/or maintain the uplink synchronization; the SR configuration information is used to indicate that the UE is switched from the second cell to the first cell.
  • the SR requesting data scheduling is sent to the first cell by using the SR resource indicated by the SR configuration information.
  • the SR configuration information is further used to notify the first cell that the UE has switched from the second cell to the first cell; further, the UE has The uplink CA may not be supported.
  • an uplink synchronization gap is needed, and the uplink synchronization gap is used to indicate that the UE transits to the first cell during the gap.
  • the uplink signal is sent, and the indication information may further include: uplink synchronization gap configuration information.
  • the uplink synchronization gap configuration information in the indication information may be determined by the first base station, and carried in the third handover message and sent to the second base station to notify the second base station, when the UE can receive the second cell.
  • Downlink data when the downlink data sent by the second cell cannot be received; the uplink synchronization gap configuration information may also be determined by the second base station and carried in the handover response message and sent to the first base station.
  • the uplink synchronization gap configuration information may not be included in the indication information, but the UE transmits the sounding reference signal to the first cell during the time period in which the resource indicated in the sounding reference signal configuration information is located, and the second The base station does not schedule downlink data of the UE during the time period in which the resource is located.
  • the first base station in order to notify the second base station, when the UE can receive the downlink data of the second cell, and when the downlink data sent by the second cell cannot be received, the first base station can carry the sounding reference signal configuration information in the third handover message. Transmitted to the second base station.
  • Step 502 The first base station receives a handover response message that is returned by the second base station according to the third handover message, and sends a first handover message to the user equipment according to the handover response message, where the first handover message is used to indicate that the user equipment is controlled by the first base station.
  • the first cell is switched to the second cell controlled by the second base station; the first handover message includes indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with the first cell.
  • Step 502 is similar to step 401, and details are not described herein again.
  • Step 503 The first base station receives an uplink signal sent by the user equipment according to the indication information, and acquires a timing advance TA or TA offset value of the user equipment according to the uplink signal.
  • the uplink signal includes a random access preamble signal or a sounding reference signal or SR. signal.
  • the UE needs to send an uplink signal to the first base station periodically or irregularly. Therefore, the indication may include one or more of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and the UE allocated by the first base station in the first cell. C-RNTI.
  • the sounding reference signal configuration information is used to enable the UE to learn on which resources the sounding reference signal is sent to the first cell to establish and/or maintain uplink synchronization; the random access preamble information is used to enable the UE to know that the RACH needs to be used when initiating the RACH.
  • the indication information may further include SR configuration information, which is used to indicate the SR resource direction indicated by the SR configuration information after the UE transits from the second cell to the first cell.
  • the first cell sends an SR request data scheduling, and the SR configuration information is further used to notify the first cell that the UE has switched from the second cell to the first cell; further, it is possible that the UE does not support the uplink CA, and therefore, when the UE During the data transmission by the second base station, in order to maintain uplink synchronization with the first base station, an uplink synchronization gap is needed, and the uplink synchronization gap is used to indicate that the UE is in the middle.
  • the indication information may further comprise: an uplink synchronization gap configuration information.
  • the uplink synchronization gap configuration information in the indication information may be determined by the first base station, and carried in the third handover message and sent to the second base station to notify the second base station, when the UE can receive the second cell.
  • Downlink data when the downlink data sent by the second cell cannot be received; the uplink synchronization gap configuration information may also be determined by the second base station and carried in the handover response message and sent to the first base station.
  • the uplink synchronization gap configuration information may not be included in the indication information, but the UE transmits the sounding reference signal to the first cell during the time period in which the resource indicated in the sounding reference signal configuration information is located, and the second The base station does not schedule downlink data of the UE during the time period in which the resource is located.
  • the first base station in order to notify the second base station, when the UE can receive the downlink data of the second cell, and when the downlink data sent by the second cell cannot be received, the first base station can carry the sounding reference signal configuration information in the third handover message. Transmitted to the second base station.
  • the first base station After receiving the uplink signal sent by the UE, the first base station acquires the TA or TA offset value of the UE according to the uplink signal.
  • Step 504 The first base station sends a TA or TA offset value, TA or TA offset value, to the user equipment. Used to enable the user equipment to establish and/or maintain uplink synchronization of the user equipment with the first cell.
  • the first base station may directly send the TA or TA offset value to the UE, or may first send the TA or TA offset value.
  • the second base station is forwarded to the UE by the second base station.
  • the specific transmission manner of the TA or TA offset value is not limited in the present invention.
  • Step 505 The first base station performs communication with the user equipment based on the first cell when the user equipment is switched from the second cell to the first cell that is in uplink synchronization with the user equipment.
  • the second base station sends a second cell control to control the second base station to control the first base station control.
  • the UE needs to return to the first cell for data transmission.
  • the UE does not need to initiate a random access procedure to the first cell according to its uplink synchronization with the first cell, and can The second cell controlled by the base station quickly switches to the first cell controlled by the first base station.
  • the UE sends an SR message to the first base station on the first cell to request the first base station to perform data scheduling on the UE for communication.
  • the communication method by sending a first handover message to the UE, to enable the UE to switch from the first cell controlled by the first base station to the second cell controlled by the second base station, and to switch from the second cell to the UE
  • the first cell communicates with the UE. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission through the second cell, the UE can quickly go to the first cell for communication without performing a random access procedure, thereby reducing the UE.
  • the data transmission interruption time caused by switching between cells improves the user experience.
  • the UE since the UE switches from the first cell to the second cell for data communication after discovering the second cell that meets the trigger condition, the power consumption of the UE can be reduced, and interference to other UEs can be reduced, and when the UE and the second cell After the radio link fails, or the UE receives the second handover message sent by the second base station to indicate that the UE switches from the second cell controlled by the second base station to the first cell controlled by the first base station, the UE may not need to The random access procedure is initiated to go to the first cell for communication, which reduces the time for data interruption, thereby improving the user experience.
  • the first base station saves the context information of the user equipment after the user equipment switches from the first cell to the second cell.
  • the first base station maintains the context information of the UE, such as the C-RNTI of the UE. So that the UE can access the first base station for data transmission at any time.
  • FIG. 6 is a schematic diagram of signaling according to Embodiment 6 of the communication method of the present invention.
  • an initial connection between a UE and a first cell controlled by a first base station is used as an example to illustrate the technical solution of the present invention.
  • the method of an embodiment may include:
  • Step 601 The UE establishes an initial connection with the first cell controlled by the first base station.
  • Step 602 The UE is configured to perform a measurement task to discover a second cell that meets the measurement trigger condition.
  • Step 603 The UE sends a measurement report to the first base station.
  • Step 604 The first base station sends a third handover message to the second base station to request the second base station to allow uplink synchronization with the first cell to be established and/or maintained after the UE switches from the first cell to the second cell.
  • Step 605 The first base station receives a handover response message returned by the second base station according to the third handover message.
  • Step 606 The first base station sends a first handover message to the UE, so that the UE switches from the first cell controlled by the first base station to the second cell controlled by the second base station.
  • Step 607 The first base station maintains context information of the UE.
  • Step 608 The UE switches to the second base station.
  • Step 609 The UE communicates with the second base station.
  • Step 610 The first base station receives, by using the first cell, an uplink signal sent by the UE according to the indication information.
  • Step 611 The first base station acquires a timing advance TA or a TA offset value of the UE according to the uplink signal.
  • Step 612 The first base station sends a TA or TA offset value to the UE.
  • Step 613 The UE establishes and/or maintains uplink synchronization between the UE and the first cell according to the TA or TA offset value.
  • Step 614 The UE transits from the second cell controlled by the second base station to the first cell controlled by the first base station.
  • Step 615 The UE sends an SR message to the first base station on the first cell.
  • Step 616 The UE communicates with the first base station.
  • the communication method by sending a first handover message to the UE, to enable the UE to switch from the first cell controlled by the first base station to the second cell controlled by the second base station, and to switch from the second cell to the UE
  • the user equipment is in the first cell of uplink synchronization, based on the first cell and the UE Line communication. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission through the second cell, the UE can quickly go to the first cell for communication without performing a random access procedure, thereby reducing the UE.
  • the data transmission interruption time caused by switching between cells improves the user experience.
  • FIG. 7 is a schematic flowchart diagram of Embodiment 7 of a communication method according to the present invention.
  • the embodiment of the present invention provides a communication method, which may be performed by any device that performs a communication method, and the device may be implemented by software and/or hardware.
  • the device can be integrated in the base station.
  • the method in this embodiment may include:
  • Step 701 The second base station sends the indication information to the user equipment, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization between the user equipment and the first cell controlled by the first base station, so that when the transition occurs, the user equipment The second cell controlled by the second base station is switched to the first cell that is in uplink synchronization with the user equipment.
  • the second base station when the UE establishes an initial connection with the second cell controlled by the second base station, the second base station sends the indication information to the UE, and after receiving the indication information, the UE establishes and/or maintains the indication information according to the indication information.
  • Uplink synchronization with the first cell controlled by the first base station in order to switch from the second cell to the first cell, may not initiate a random access procedure, directly according to the uplink synchronization with the second cell, from the second cell Switch to the first cell for data transmission. It should be noted that when the UE is in uplink synchronization with the first cell according to the indication information, the UE is in an RRC connected state, and at this time, the serving cell of the UE is the second cell controlled by the second base station.
  • the communication method provided by the embodiment of the present invention sends the indication information to the UE, where the indication information is used to indicate that the UE establishes and/or maintains uplink synchronization between the UE and the first cell controlled by the first base station, so that when the transition occurs, the user
  • the device switches from the second cell controlled by the second base station to the first cell that is in uplink synchronization with the user equipment. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission through the second cell, the UE can quickly go to the first cell for communication without performing a random access procedure, thereby reducing the UE.
  • the data transmission interruption time caused by switching between cells improves the user experience.
  • the second base station sends a handover request to the first base station, where the handover request is used to switch the user equipment from the second cell to the first cell that is in uplink synchronization with the user equipment, and the user The device communicates based on the first cell.
  • the second base station when the UE establishes an initial connection with the second cell controlled by the second base station, the second base station further The UE may be notified to perform handover based on the first cell by transmitting a handover request to the first base station to notify the first base station to switch the UE from the second cell to the first cell that is in uplink synchronization with the UE. It should be noted that this step may be performed before step 701, or may be performed after step 702, which is not limited in this embodiment.
  • the second base station receives an indication response message returned by the user equipment according to the indication message, where the indication response message is used to indicate that the user equipment has received the indication information.
  • the UE after receiving the indication information sent by the second base station, the UE returns an indication response message to the second base station to notify the second base station that the UE has received the indication information that it sends.
  • FIG. 8 is a schematic flowchart of Embodiment 8 of a communication method according to the present invention.
  • the method in this embodiment may include:
  • Step 801 The second base station sends a request message to the first base station, where the request message is used to request the first cell to allow the user equipment to establish and/or maintain uplink synchronization between the user equipment and the first cell.
  • the UE establishes an initial connection with the second cell controlled by the second base station, that is, the second cell is the current serving cell of the UE, and the first cell controlled by the first base station is not the serving cell of the UE, because the second base station The coverage is small. After the UE enters the coverage of the small base station, it is likely that the coverage of the small base station is removed again. At this time, the UE frequently switches between cells, which increases the time for data interruption. Moreover, the probability of switching failure is increased.
  • the second base station when the UE performs data transmission on the second cell controlled by the second base station, the second base station sends a request message to the first base station to request the first base station to allow the UE to establish and/or Or maintaining uplink synchronization with the first cell controlled by the first base station.
  • the request message carries the context information of the UE to identify the UE, for example, the context information may be a C-RNTI.
  • Step 802 The second base station receives the response message sent by the first base station according to the request message, and sends the indication information to the user equipment according to the response message.
  • the first base station returns a response message to the second base station according to the received request message, and after receiving the response message, the second base station sends the indication information to the UE.
  • the indication information may include one or more of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and the UE allocated by the first base station in the The cell radio network in the first cell temporarily identifies the C-RNTI.
  • the sounding reference signal configuration information is used to enable the UE to know on which resources the sounding reference signal is sent to the first cell to establish and/or Or maintaining the uplink synchronization;
  • the random access preamble information is used to enable the UE to know which random access preamble resource to use when initiating the RACH, that is, the first base station allocates and reserves a dedicated random access preamble resource to the UE;
  • the C-RNTI of the allocated UE in the first cell is used to enable the UE to access the first cell.
  • the indication information may further include SR configuration information, which is used by the UE.
  • the SR configuration information is further used to notify the first cell that the UE has been converted from the first The second cell is switched to the first cell; further, it is possible that the UE does not support the uplink CA. Therefore, during the data transmission by the UE during the second base station, in order to maintain uplink synchronization with the first base station, an uplink synchronization gap is required, and the uplink synchronization gap is needed. And indicating that the UE sends an uplink signal to the first cell during the gap, and the indication information may further include: uplink synchronization gap configuration information.
  • the uplink synchronization gap configuration information in the indication information may be determined by the first base station, and carried in the third handover message and sent to the second base station to notify the second base station, when the UE can receive the second cell.
  • Downlink data when the downlink data sent by the second cell cannot be received; the uplink synchronization gap configuration information may also be determined by the second base station and carried in the handover response message and sent to the first base station.
  • the uplink synchronization gap configuration information may not be included in the indication information, but the UE sends the sounding reference signal to the first cell in the time period during which the resource indicated in the sounding reference signal configuration information is located, and the first The second base station does not schedule downlink data of the UE during the time period in which the resource is located.
  • the first base station in order to notify the second base station, when the UE can receive the downlink data of the second cell, and when the downlink data sent by the second cell cannot be received, the first base station can carry the sounding reference signal configuration information in the third handover message. Transmitted to the second base station.
  • the communication method provided by the embodiment of the present invention sends the indication information to the UE, where the indication information is used to indicate that the UE establishes and/or maintains uplink synchronization between the UE and the first cell controlled by the first base station, so that the UE controls from the second base station.
  • the second cell is switched to the first cell, and the UE communicates with the UE when the UE transitions from the second cell to the first cell that is in uplink synchronization with the user equipment according to the uplink synchronization between the UE and the first cell.
  • the UE Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission through the second cell, the UE can quickly go to the first cell for communication without performing a random access procedure, thereby reducing the UE.
  • the data transmission interruption time caused by switching between cells improves the user experience.
  • the second base station sends a handover message to the UE, where the handover message is used to enable the UE to use the second cell.
  • the handover message is used to enable the UE to use the second cell.
  • the second base station may send a handover message to the UE, to indicate that the UE switches from the second cell controlled by the second base station to the first cell controlled by the first base station, and at this time, the UE synchronizes with the uplink of the first cell according to the second cell.
  • the second cell controlled by the second base station can be quickly switched to the first cell controlled by the first base station without starting a random access procedure to the first cell.
  • FIG. 9 is a schematic diagram of signaling according to Embodiment 9 of the communication method of the present invention.
  • an initial connection between a UE and a second cell controlled by a second base station is used as an example to illustrate the technical solution of the present invention.
  • the method of an embodiment may include:
  • Step 901 The UE establishes an initial connection with a second cell controlled by the second base station.
  • Step 902 The second base station sends a request message to the first base station to request the first cell to allow the UE to establish and/or maintain uplink synchronization with the first cell.
  • Step 903 The first base station sends a response message to the second base station.
  • Step 904 The second base station sends the indication information to the UE according to the response message.
  • Step 905 The first base station receives, by using the first cell, an uplink signal that is sent by the UE according to the indication information.
  • Step 906 The first base station acquires a timing advance TA or a TA offset value of the UE according to the uplink signal.
  • Step 907 The first base station sends a TA or TA offset value to the UE.
  • Step 908 The UE establishes and/or maintains uplink synchronization with the first cell according to the TA or TA offset value.
  • Step 909 The UE transits from the second cell controlled by the second base station to the first cell controlled by the first base station.
  • Step 910 The UE sends an SR message to the first base station on the first cell.
  • Step 911 The UE performs data communication with the first base station.
  • the communication method provided by the embodiment of the present invention sends the indication information to the UE, where the indication information is used to indicate that the UE establishes and/or maintains uplink synchronization between the UE and the first cell controlled by the first base station, so that the UE controls from the second base station.
  • the second cell is switched to the first cell. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission through the second cell, the UE can quickly go to the first cell for communication without performing a random access procedure, thereby reducing the UE.
  • the data transmission interruption time caused by switching between cells improves the user experience.
  • FIG. 10 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention, as shown in FIG. 10, the present invention
  • the user equipment provided by the embodiment includes a receiving unit 11 and a processing unit 12.
  • the receiving unit 11 is configured to receive indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with a first cell controlled by the first base station; Transmitting, by the second cell, the first cell that is in uplink synchronization with the user equipment, and performing communication based on the first cell;
  • the user equipment When the user equipment is in uplink synchronization with the first cell according to the indication information, the user equipment is in a radio resource control RRC connected state, and the serving cell of the user equipment is a second base station controlled second. Community.
  • the user equipment provided by the embodiment of the present invention receives the indication information, when the UE is in uplink synchronization with the first cell according to the indication information, the UE is in the RRC connection state of the radio resource control, and the serving cell of the UE is the second control by the second base station.
  • the UE transits from the second cell to the first cell that is in uplink synchronization with the UE, and performs communication based on the first cell.
  • the UE Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission based on the second cell, when the UE needs to perform communication based on the first cell, the UE may need to perform a random access procedure to quickly go to the first The cell reduces the data transmission interruption time caused by the UE switching between cells, thereby improving the user experience.
  • the receiving unit 11 is specifically configured to:
  • the first base station Receiving, by the first base station, the first handover message, where the first handover message is used to indicate that the user equipment is handed over from the first cell to the second cell, where the first handover message includes the indication information.
  • the receiving unit 11 is specifically configured to:
  • FIG. 11 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention. As shown in FIG. 11, this embodiment is based on the embodiment shown in FIG. 10, and the user equipment further includes a sending unit 13.
  • the sending unit 13 is configured to send an uplink signal to the first base station according to the indication information, so that the first base station acquires a time advance TA or TA offset value of the user equipment according to the uplink signal;
  • the receiving unit 11 is further configured to receive the TA or TA offset value that is sent by the first base station or the first base station by using the second base station;
  • the processing unit 12 is configured to establish and/or maintain uplink synchronization of the user equipment and the first cell according to the TA or TA offset value.
  • the uplink signal sent by the sending unit 13 includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the indication information received by the receiving unit 11 includes at least one of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and allocation by the first base station.
  • the user equipment temporarily identifies a C-RNTI in a cell radio network in the first cell.
  • the receiving unit 11 is further configured to receive a second handover message sent by the second base station;
  • the processing unit 12 is specifically configured to:
  • the receiving unit 11 receives the second handover message sent by the second base station, switching from the second cell to the second cell The first cell that the user equipment maintains uplink synchronization; wherein the second handover message is used to indicate that the user equipment is handed over from the second cell to the first cell.
  • the sending unit 13 is further configured to send, by using the first cell, an SR message to the first base station, where the SR message is used to request the first base station to perform data scheduling on the user equipment.
  • the user equipment of this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention.
  • a base station according to an embodiment of the present invention includes a sending unit 21 and a processing unit 22.
  • the sending unit 21 is configured to send a first handover message to the user equipment, where the first handover message is used to indicate that the user equipment is handed over from the first cell controlled by the first base station to the second cell controlled by the second base station;
  • the first switching message includes the indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization between the user equipment and the first cell; and the processing unit 22 is configured to be in the user When the device transitions from the second cell to the first cell that is in uplink synchronization with the user equipment, the device communicates with the user equipment based on the first cell.
  • the base station provided by the embodiment of the present invention sends a first handover message to the UE, so that the UE switches from the first cell controlled by the first base station to the second cell controlled by the second base station, and the UE transitions from the second cell to the user.
  • the first cell and the UE communicate according to the first cell. Since the UE establishes and/or maintains uplink synchronization with the first cell when performing data transmission through the second cell, the UE can go to the first cell to perform communication without performing a random access procedure.
  • the message reduces the data transmission interruption time caused by the UE switching between cells, thereby improving the user experience.
  • FIG. 13 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention. As shown in FIG. 13, this embodiment is based on the embodiment shown in FIG. 12, and the base station includes a receiving unit 23.
  • the receiving unit 23 is configured to receive, according to the first cell, an uplink signal sent by the user equipment according to the indication information, and acquire, according to the uplink signal, a timing advance TA or TA offset of the user equipment.
  • the sending unit 21 is further configured to send the TA or TA offset value to the user equipment, where the TA or TA offset value is used to enable the user equipment to establish and/or maintain the user equipment and Uplink synchronization of the first cell.
  • the uplink signal received by the receiving unit 23 includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the base station further includes: a saving unit 24;
  • the saving unit 24 is configured to save context information of the user equipment after the user equipment switches from the first cell to the second cell.
  • the indication information sent by the sending unit 21 includes at least one of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and allocation by the first base station.
  • the user equipment temporarily identifies a C-RNTI in a cell radio network in the first cell.
  • the sending unit 21 is further configured to send, to the second base station, a third handover message, where the third handover message is used to request the second base station to allow the user equipment to be from the first cell. Establishing and/or maintaining uplink synchronization with the first cell after switching to the second cell;
  • the receiving unit 23 is further configured to receive a handover response message that is returned by the second base station according to the third handover message.
  • the third handover message sent by the sending unit 21 includes at least one of the following information: sounding reference signal configuration information, scheduling request SR configuration information, and uplink synchronization gap configuration information.
  • the base station of this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 14 is a schematic structural diagram of Embodiment 3 of a base station according to the present invention.
  • the base station provided by the embodiment of the present invention includes a sending unit 31.
  • the sending unit 31 is configured to send the indication information to the user equipment, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with the first cell controlled by the first base station, so that When the transition occurs, the user equipment switches from the second cell controlled by the second base station to the first cell that is in uplink synchronization with the user equipment.
  • the indication information sent by the sending unit 31 includes at least one of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and allocation by the first base station.
  • the user equipment temporarily identifies a C-RNTI in a cell radio network in the first cell.
  • the sending unit 31 is further configured to send, to the user equipment, a handover message, where the handover message is used to switch the user equipment from the second cell to a location that maintains uplink synchronization with the user equipment. Said first cell.
  • FIG. 15 is a schematic structural diagram of Embodiment 4 of a base station according to the present invention. As shown in FIG. 15, this embodiment is based on the embodiment shown in FIG. 14, and the base station includes a receiving unit 32.
  • the sending unit 31 is further configured to send a request message to the first base station, where the request message is used to request the first cell to allow the user equipment to establish and/or maintain uplink synchronization with the first cell;
  • the receiving unit 32 is further configured to receive a response message that is sent by the first base station according to the request message.
  • the base station of this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 16 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • the user equipment provided by the embodiment of the present invention includes a receiver 51 and a processor 52.
  • the receiver 51 is configured to receive indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization of the user equipment with a first cell controlled by the first base station; Transmitting, by the second cell, the first cell that is in uplink synchronization with the user equipment, and performing communication based on the first cell;
  • the user equipment When the user equipment is in uplink synchronization with the first cell according to the indication information, the user equipment is in a radio resource control RRC connected state, and the serving cell of the user equipment is a second base station controlled second. Community.
  • the user equipment provided in this embodiment may be used to perform the implementation provided by any embodiment of the present invention.
  • the technical solution of the letter method has similar implementation principles and technical effects, and will not be described here.
  • the receiver 51 is configured to: receive a first handover message sent by the first base station, where the first handover message is used to indicate that the user equipment is switched from the first cell to the first The second cell, the first handover message includes the indication information.
  • the receiver 51 is specifically configured to: receive the indication information sent by the second base station.
  • the user equipment provided in this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 17 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention. As shown in FIG. 17, this embodiment is based on the embodiment shown in FIG. 16, and the user equipment includes a transmitter 53.
  • the transmitter 53 is configured to send an uplink signal to the first base station according to the indication information, so that the first base station acquires a timing advance TA or TA offset of the user equipment according to the uplink signal. value;
  • the receiver 51 is further configured to receive the TA or TA offset value sent by the first base station or the first base station by using the second base station;
  • the processor 52 is further configured to establish and/or maintain uplink synchronization of the user equipment with the first cell according to the TA or TA offset value.
  • the uplink signal sent by the transmitter 53 includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the indication information received by the receiver 51 includes at least one of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and allocation by the first base station.
  • the user equipment temporarily identifies a C-RNTI in a cell radio network in the first cell.
  • the receiver 51 is further configured to receive a second handover message sent by the second base station;
  • the processor 52 is further configured to: if a radio link failure occurs between the user equipment and the second cell, or the receiver receives a second handover message sent by the second base station, from the The second cell is switched to the first cell that is in uplink synchronization with the user equipment; wherein the second handover message is used to indicate that the user equipment is handed over from the second cell to the first cell.
  • the transmitter 53 is further configured to send, by using the first cell, an SR message to the first base station, where the SR message is used to request the first base station to perform data scheduling on the user equipment.
  • the user equipment provided in this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 18 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention.
  • a base station according to an embodiment of the present invention includes a transmitter 71 and a processor 72.
  • the transmitter 71 is configured to send a first handover message to the user equipment, where the first handover message is used to indicate that the user equipment is handed over from the first cell controlled by the first base station to the second cell controlled by the second base station;
  • the first handover message includes the indication information, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization between the user equipment and the first cell; And when the user equipment is switched from the second cell to the first cell that is in uplink synchronization with the user equipment, performing communication according to the first cell and the user equipment.
  • the base station provided in this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 19 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention. As shown in FIG. 19, in this embodiment, based on the embodiment shown in FIG. 18, the base station includes a receiver 73.
  • the receiver 73 is configured to receive, according to the first cell, an uplink signal that is sent by the user equipment according to the indication information, and acquire, according to the uplink signal, a timing advance TA or TA offset of the user equipment. value;
  • the transmitter 71 is further configured to send the TA or TA offset value to the user equipment, where the TA or TA offset value is used to enable the user equipment to establish and/or maintain the user equipment and the Uplink synchronization between the first cells.
  • the uplink signal received by the receiver 73 includes: a random access preamble signal or a sounding reference signal or a scheduling request SR signal.
  • the base station further includes a memory 74;
  • the memory 74 is configured to save context information of the user equipment after the user equipment switches from the first cell to the second cell.
  • the indication information sent by the transmitter 71 includes at least one of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and allocation by the first base station.
  • the user equipment temporarily identifies a C-RNTI in a cell radio network in the first cell.
  • the transmitter 71 is further configured to send a third handover message to the second base station, where The third handover message is used to request the second base station to allow uplink synchronization between the user equipment and the first cell to be established and/or maintained after the user equipment is switched from the first cell to the second cell;
  • the receiver 73 is further configured to receive a handover response message that is returned by the second base station according to the third handover message.
  • the third handover message sent by the sender 71 includes at least one of the following: the sounding reference signal configuration information, the scheduling request SR configuration information, and the uplink synchronization gap configuration information.
  • the base station provided in this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 20 is a schematic structural diagram of Embodiment 3 of a base station according to the present invention.
  • a base station provided by an embodiment of the present invention includes a transmitter 91.
  • the transmitter 91 is configured to send the indication information to the user equipment, where the indication information is used to indicate that the user equipment establishes and/or maintains uplink synchronization between the user equipment and the first cell controlled by the first base station, so that When the transition occurs, the user equipment switches from the second cell controlled by the second base station to the first cell that is in uplink synchronization with the user equipment.
  • the base station provided in this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • the indication information sent by the transmitter 91 includes at least one of the following information: sounding reference signal configuration information, random access preamble information, SR configuration information, uplink synchronization gap configuration information, and allocation by the first base station.
  • the user equipment temporarily identifies a C-RNTI in a cell radio network in the first cell.
  • the transmitter 91 is further configured to send, to the user equipment, a handover message, where the handover message is used to switch the user equipment from the second cell to a location that maintains uplink synchronization with the user equipment. Said first cell.
  • FIG. 21 is a schematic structural diagram of Embodiment 4 of a base station according to the present invention. As shown in FIG. 21, in this embodiment, based on the embodiment shown in FIG. 20, the base station further includes a receiver 92.
  • the transmitter 91 is further configured to send a request message to the first base station, where the request message is used to request the first cell to allow the user equipment to establish and/or maintain uplink synchronization with the first cell.
  • the receiver 92 is further configured to receive a response sent by the first base station according to the request message. Message.
  • the base station provided in this embodiment may be used to implement the technical solution of the communication method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, and a read only A medium that can store program code, such as a ROM (Read-Only Memory), a random access memory (RAM), a magnetic disk, or an optical disk.

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Abstract

本发明实施例涉及一种通信方法和设备，该方法包括：接收指示信息，该指示信息用于指示用户设备建立和/或维持用户设备与第一基站控制的第一小区的上行同步；当用户设备根据指示信息与第一小区处于上行同步时，用户设备处于无线资源控制RRC连接态，用户设备的服务小区为第二基站控制的第二小区；用户设备从第二小区转换到与用户设备处于上行同步的第一小区，并基于第一小区进行通信。本发明实施例提供的通信方法和设备减少了UE在小区之间转换引起的数据传输中断的时间。

Description

通信方法和设备 技术领域
本发明实施例涉及通信技术，特别涉及一种通信方法和设备。
背景技术
随着智能手机的普及，用户的流量需求越来越大，密集的小基站部署是应对越来越大的流量需求的一个有效方法，也是将来的一个发展趋势。然而，由于小基站的覆盖范围很小，用户设备(User Equipment；简称：UE)在进入小基站覆盖范围后，有可能很快又移出小基站的覆盖，使得UE发生频繁的切换，造成用户体验较差。
针对这个问题，目前可以通过双连接(Dual Connectivity；简称：DC)技术来解决。具体地，DC技术即支持两个基站下的多个小区进行载波聚合(Carrier Aggregation；简称：CA)。对一个UE来说，其中一个是主基站(Master eNB；简称：MeNB)，另一个是辅基站(Secondary eNB；简称：SeNB)，在DC技术中，要求UE连接到两个基站下的小区，其中，主基站和辅基站均可以传输用户数据，而且主基站需要承担更多的控制功能，例如：传输无线资源控制(Radio Resource Control；简称：RRC)信令等。
然而，若采用DC技术解决由于UE的移动造成频繁的切换的问题时，宏基站需要作为主基站，小基站作为辅基站，DC技术需要UE在主基站(宏基站)进行通信，这不利于UE的省电；此外，该UE必须具有载波聚合(Carrier Aggregation；简称：CA)的能力，即能同时支持上行CA和下行CA，否则无法使用DC。因此，对于不支持DC的UE来说，其在进入小基站覆盖范围后，又很快移出小基站的覆盖的情形，会使得UE发生频繁的转换，导致数据传输中断的时间较长，造成用户体验较差。
发明内容
本发明实施例提供一种通信方法和设备，用于减少UE在小区之间转换引起的数据传输中断的时间，从而提高了用户体验。
第一方面，本发明实施例提供一种通信方法，包括：
用户设备接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；
当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区；
所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区，并基于所述第一小区进行通信。
结合第一方面，在第一方面的第一种可能的实现方式中，所述用户设备接收指示信息，包括：
所述用户设备接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
结合第一方面，在第一方面的第二种可能的实现方式中，所述用户设备接收指示信息，包括：
所述用户设备接收所述第二基站发送的所述指示信息。
结合第一方面、第一方面的第一种至第一方面的第二种任一种可能的实现方式，在第一方面的第三种可能的实现方式中，还包括：
所述用户设备根据所述指示信息向所述第一基站发送上行信号，以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述用户设备接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值，并根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区之间的上行同步。
结合第一方面的第三种可能的实现方式，在第一方面的第四种可能的实现方式中，所述上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
结合第一方面、第一方面的第一种至第一方面的第四种任一种可能的实现方式，在第一方面的第五种可能的实现方式中，所述指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、 上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第一方面、第一方面的第一种至第一方面的第五种任一种可能的实现方式，在第一方面的第六种可能的实现方式中，所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区，具体包括：
若所述用户设备与所述第二小区之间发生无线链路失败，或所述用户设备接收到所述第二基站发送的第二切换消息，所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
结合第一方面、第一方面的第一种至第一方面的第六种任一种可能的实现方式，在第一方面的第七种可能的实现方式中，还包括：
所述用户设备通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
第二方面，本发明实施例提供一种通信方法，包括：
第一基站向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与所述第一小区的上行同步；
所述第一基站在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
结合第二方面，在第二方面的第一种可能的实现方式中，还包括：
所述第一基站基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述第一基站向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一小区之间的上行同步。
结合第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，所述上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
结合第二方面、第二方面的第一种至第二方面的第二种任一种可能的实现方式，在第二方面的第三种可能的实现方式中，所述方法还包括：
所述第一基站在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
结合第二方面、第二方面的第一种至第二方面的第三种任一种可能的实现方式，在第二方面的第四种可能的实现方式中，所述指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第二方面、第二方面的第一种至第二方面的第四种任一种可能的实现方式，在第二方面的第五种可能的实现方式中，所述第一基站向用户设备发送第一切换消息之前，所述方法还包括：
所述第一基站向所述第二基站发送第三切换消息，所述第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区的上行同步；
所述第一基站接收所述第二基站根据所述第三切换消息返回的切换响应消息。
结合第二方面的第五种可能的实现方式，在第二方面的第六种可能的实现方式中，所述第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
第三方面，本发明实施例提供一种通信方法，包括：
第二基站向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
结合第三方面，在第三方面的第一种可能的实现方式中，所述指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第二 种可能的实现方式中，所述方法还包括：
所述第二基站向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区。
结合第三方面、第三方面的第一种至第三方面的第二种任一种可能的实现方式，在第三方面的第三种可能的实现方式中，所述第二基站向用户设备发送指示信息之前，所述方法还包括：
所述第二基站向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
所述第二基站接收所述第一基站根据所述请求消息发送的响应消息。
第四方面，本发明实施例提供一种用户设备，包括：
接收单元，用于接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；
处理单元，用于从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区，并基于所述第一小区进行通信；
其中，当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区。
结合第四方面，在第四方面的第一种可能的实现方式中，所述接收单元具体用于：
接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
结合第四方面，在第四方面的第二种可能的实现方式中，所述接收单元具体用于：
接收所述第二基站发送的所述指示信息。
结合第四方面、第四方面的第一种至第四方面的第二种任一种可能的实现方式，在第四方面第三种可能的实现方式中，所述用户设备还包括：发送单元；其中，
所述发送单元，用于根据所述指示信息向所述第一基站发送上行信号， 以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述接收单元，还用于接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值；
所述处理单元，用于根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区的上行同步。
结合第四方面的第三种可能的实现方式，在第四方面的第四种可能的实现方式中，所述发送单元发送的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
结合第四方面、第四方面的第一种至第四方面的第四种任一种可能的实现方式，在第四方面第五种可能的实现方式中，所述接收单元接收的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第四方面、第四方面的第一种至第四方面的第五种任一种可能的实现方式，在第四方面第六种可能的实现方式中，所述接收单元，还用于接收所述第二基站发送的第二切换消息；
所述处理单元具体用于：
若所述用户设备与所述第二小区之间发生无线链路失败，或所述接收单元接收到所述第二基站发送的第二切换消息时，从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
结合第四方面、第四方面的第一种至第四方面的第六种任一种可能的实现方式，在第四方面第七种可能的实现方式中，所述发送单元，还用于通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
第五方面，本发明实施例提供一种基站，包括：
发送单元，用于向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户 设备建立和/或维持所述用户设备与所述第一小区的上行同步；
处理单元，用于在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
结合第五方面，在第五方面的第一种可能的实现方式中，所述基站还包括：接收单元；其中，
所述接收单元，用于基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述发送单元，还用于向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一小区的上行同步。
结合第五方面的第一种可能的实现方式，在第五方面的第二种可能的实现方式中，所述接收单元接收的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
结合第五方面、第五方面的第一种至第五方面的第二种任一种可能的实现方式，在第五方面的第三种可能的实现方式中，所述基站还包括：保存单元；其中，
所述保存单元，用于在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
结合第五方面、第五方面的第一种至第五方面的第三种任一种可能的实现方式，在第五方面的第四种可能的实现方式中，所述发送单元发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第五方面、第五方面的第一种至第五方面的第四种任一种可能的实现方式，在第五方面的第五种可能的实现方式中，所述发送单元，还用于向所述第二基站发送第三切换消息，所述第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区的上行同步；
所述接收单元，还用于接收所述第二基站根据所述第三切换消息返回的切换响应消息。
结合第五方面的第五种可能的实现方式，在第五方面的第六种可能的实现方式中，所述发送单元发送的第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
第六方面，本发明提供一种基站，包括：
发送单元，用于向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
结合第六方面，在第六方面的第一种可能的实现方式中，所述发送单元发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第六方面或第六方面的第一种可能的实现方式，在第六方面的第二种可能的实现方式中，所述发送单元，还用于向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区。
结合第六方面、第六方面的第一种至第六方面的第二种任一种可能的实现方式，在第六方面的第三种可能的实现方式中，所述基站还包括：接收单元；其中，
所述发送单元，还用于向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
所述接收单元，还用于接收所述第一基站根据所述请求消息发送的响应消息。
第七方面，本发明实施例提供一种用户设备，包括：
接收器，用于接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；
处理器，用于从所述第二小区转换到与所述用户设备处于上行同步的所 述第一小区，并基于所述第一小区进行通信；
其中，当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区。
结合第七方面，在第七方面的第一种可能的实现方式中，所述接收器具体用于：
接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
结合第七方面，在第七方面的第二种可能的实现方式中，所述接收器具体用于：接收所述第二基站发送的所述指示信息。
结合第七方面、第七方面的第一种至第七方面的第二种任一种可能的实现方式，在第七方面的第三种可能的实现方式中，所述用户设备还包括：发送器；其中，
所述发送器，用于根据所述指示信息向所述第一基站发送上行信号，以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述接收器，还用于接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值；
所述处理器，还用于根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区的上行同步。
结合第七方面的第三种可能的实现方式，在第七方面的第四种可能的实现方式中，所述发送器发送的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
结合第七方面、第七方面的第一种至第七方面的第四种任一种可能的实现方式，在第七方面的第五种可能的实现方式中，所述接收器接收的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第七方面、第七方面的第一种至第七方面的第五种任一种可能的实 现方式，在第七方面的第六种可能的实现方式中，所述接收器，还用于接收所述第二基站发送的第二切换消息；
所述处理器，还用于若所述用户设备与所述第二小区之间发生无线链路失败，或所述接收器接收到所述第二基站发送的第二切换消息，从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
结合第七方面、第七方面的第一种至第七方面的第六种任一种可能的实现方式，在第七方面的第七种可能的实现方式中，
所述发送器，还用于通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
第八方面，本发明实施例提供一种基站，包括：
发送器，用于向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与所述第一小区之间的上行同步；
处理器，用于在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
结合第八方面，在第八方面的第一种可能的实现方式中，所述基站还包括：接收器；其中，
所述接收器，用于基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述发送器，还用于向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一小区之间的上行同步。
结合第八方面的第一种可能的实现方式，在第八方面的第二种可能的实现方式中，所述接收器接收的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
结合第八方面、第八方面的第一种至第八方面的第二种任一种可能的实现方式，在第八方面的第三种可能的实现方式中，所述基站还包括：存储器； 其中，
所述存储器，用于在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
结合第八方面、第八方面的第一种至第八方面的第三种任一种可能的实现方式，在第八方面的第四种可能的实现方式中，所述发送器发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第八方面、第八方面的第一种至第八方面的第四种任一种可能的实现方式，在第八方面的第五种可能的实现方式中，所述发送器，还用于向所述第二基站发送第三切换消息，所述第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区之间的上行同步；
所述接收器，还用于接收所述第二基站根据所述第三切换消息返回的切换响应消息。
结合第八方面的第五种可能的实现方式，在第八方面的第六种可能的实现方式中，所述发送器发送的第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
第九方面，本发明实施例提供一种基站，包括：
发送器，用于向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
结合第九方面，在第九方面的第一种可能的实现方式中，所述发送器发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
结合第九方面或第九方面的第一种可能的实现方式，在第九方面的第二种可能的实现方式中，所述发送器，还用于向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保 持上行同步的所述第一小区。
结合第九方面、第九方面的第一种至第九方面的第二种任一种可能的实现方式，在第九方面的第三种可能的实现方式中，所述基站还包括：接收器；其中，
所述发送器，还用于向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
所述接收器，还用于接收所述第一基站根据所述请求消息发送的响应消息。
本发明提供的通信方法和设备，通过接收指示信息，并当UE根据该指示信息与第一小区处于上行同步时，UE处于无线资源控制RRC连接态，UE的服务小区为第二基站控制的第二小区，UE从第二小区转换到与UE处于上行同步的第一小区，并基于第一小区进行通信。由于UE在基于第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，当UE需要基于第一小区进行通信时，不需要执行随机接入过程即可快速转到第一小区，减少了UE在小区之间转换引起的数据传输中断时间，从而提高了用户体验。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明通信方法实施例一的流程示意图；
图2为本发明通信方法实施例二的流程示意图；
图3为本发明通信方法实施例三的流程示意图；
图4为本发明通信方法实施例四的流程示意图；
图5为本发明通信方法实施例五的流程示意图；
图6为本发明通信方法实施例六的信令示意图；
图7为本发明通信方法实施例七的流程示意图；
图8为本发明通信方法实施例八的流程示意图；
图9为本发明通信方法实施例九的信令示意图；
图10为本发明用户设备实施例一的结构示意图；
图11为本发明用户设备实施例二的结构示意图；
图12为本发明基站实施例一的结构示意图；
图13为本发明基站实施例二的结构示意图；
图14为本发明基站实施例三的结构示意图；
图15为本发明基站实施例四的结构示意图；
图16为本发明用户设备实施例一的结构示意图；
图17为本发明用户设备实施例二的结构示意图；
图18为本发明基站实施例一的结构示意图；
图19为本发明基站实施例二的结构示意图；
图20为本发明基站实施例三的结构示意图；
图21为本发明基站实施例四的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供的方法可以用于不同的制式的无线网络中，例如：全球移动通信系统(Global System for Mobile Communication；简称：GSM)、码分多址(Code Division Multiple Access；简称：CDMA)、CDMA2000、宽带码分多址(Wideband Code Division Multiple Access；简称：WCDMA)、时分同步码分多址(Time Division-Synchronous Code Division Multiple Access；简称：TD-SCDMA)、长期演进(Long Term Evolution，LTE)系统或LTE的后续演进系统等。无线接入网络在不同的系统中可包括不同的网元。例如，LTE和LTE的后续演进系统中无线接入网络的网元包括UE和基站NodeB，本发明实施例并不限定。
图1为本发明通信方法实施例一的流程示意图。本发明实施例提供了一种通信方法，该方法可以由任意执行通信方法的装置来执行，该装置可以通 过软件和/或硬件实现。本实施例中，该装置可以集成在UE中。如图1所示，本实施例的方法可以包括：
步骤101、用户设备接收指示信息，该指示信息用于指示用户设备建立和/或维持用户设备与第一基站控制的第一小区的上行同步。
在本实施例中，指示信息可以仅用于指示UE建立其与第一基站控制的第一小区的上行同步，或者仅用于指示UE维持其与第一基站控制的第一小区的上行同步，也可以用于指示UE建立并维持其与第一基站控制的第一小区的上行同步。其中，第一基站例如可以为宏基站。
步骤102、当用户设备根据指示信息与第一小区处于上行同步时，用户设备处于无线资源控制RRC连接态，用户设备的服务小区为第二基站控制的第二小区。
在本实施例中，UE接收到指示信息之后，会根据该指示信息建立和/或维持其与第一小区的上行同步。需要进行说明的是，本步骤中，当UE与第一小区处于上行同步时，UE处于RRC连接态，而且第一小区并不是UE的服务小区，而UE的服务小区为第二基站控制的第二小区。其中，第二基站例如可以为小基站。
步骤103、用户设备从第二小区转换到与用户设备处于上行同步的第一小区，并基于第一小区进行通信。
在本实施例中，在UE建立和/或维持其与第一小区的上行同步后，若UE需要从第二小区转换到第一小区时，在不需要向第一小区发起随机接入过程的情况下，即可根据其与第一小区的上行同步，直接转换到第一小区，并基于第一小区进行数据和信令的传输。
值得注意的是，第一基站和第二基站可以为同一个基站，也可以为不同的基站，当第一基站与第二基站为同一个基站时，UE是在同一个基站下的不同小区之间进行转换。
本发明实施例提供的通信方法，通过接收指示信息，当UE根据该指示信息与第一小区处于上行同步时，UE处于无线资源控制RRC连接态，UE的服务小区为第二基站控制的第二小区，UE从第二小区转换到与UE处于上行同步的第一小区，并基于第一小区进行通信。由于UE在基于第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，当UE需要基于第一 小区进行通信时，不需要执行随机接入过程即可快速转到第一小区，减少了UE在小区之间转换引起的数据传输中断时间，从而提高了用户体验。
图2为本发明通信方法实施例二的流程示意图，本实施例在基于图1所示实施例的基础上，对UE与第一基站控制的第一小区建立初始连接的实施例，做详细说明。如图2所示，本实施例的方法可以包括：
步骤201、用户设备接收第一基站发送的第一切换消息，第一切换消息用于指示用户设备从第一小区切换到第二小区，第一切换消息包括指示信息。
在本实施例中，UE若与第一基站控制的第一小区建立初始连接。在本步骤中，第一小区为UE的当前服务小区时，由于第一基站为宏基站，其覆盖范围较大，导致UE在第一基站下进行数据通信时的功耗较大，因此，UE会被配置测量任务，以发现满足测量触发条件的第二小区，其中，满足测量触发条件的第二小区为信号质量较好的小基站下的小区。在具体的实现过程中，UE可以测量各小区的参考信号接收功率(reference signal receiving power；简称：RSRP)的值，并判断该值是否大于预设阈值，若大于预设阈值，则说明该RSRP值对应的小区满足测量触发条件。其中，预设阈值可以根据实际情况进行设定，对于预设阈值的具体取值，本发明不作特别限制。在UE发现满足测量触发条件的第二小区之后，UE向第一基站发送测量报告，第一基站根据UE发送的测量报告，决定将UE切换到第二基站进行通信，此时，第一基站会向第二基站发送第三切换消息，第三切换消息中携带有请求信息，该请求信息用于请求第二基站允许在UE从第一小区切换到第二小区后建立和/或维持与第一小区的上行同步，第二基站根据接收到的携带有请求信息的第三切换消息，向第一基站返回切换响应消息。此时，第一基站根据该切换响应消息向UE发送第一切换消息，该第一切换消息中包括指示信息，其中，指示信息用于指示UE从第一基站控制的第一小区切换到第二基站控制的第二小区，由于第二基站为小基站，其覆盖范围较小，因此，当UE在第二基站中进行数据传输时，可以达到省电的目的。此外，与现有技术中的切换过程相比，第一基站向UE发送第一切换消息后，仍然保留UE的上下文信息，在后续UE回到第一基站后能基于这些上下文信息与UE进行通信；同理，UE在收到第一切换消息后，也保留当前的UE的上下文信息，在后续UE回到第一基站后能基于这些上下文信息与第一基站进行通信。
在现有技术中，若UE从第一基站控制的第一小区切换到第二基站控制的第二小区之后，数据将从服务网关发向第一基站改为从服务网关发向第二基站。可选地，由于第二基站是覆盖范围较小的小基站，可能UE很快就又回到第一基站，故会频繁的进行数据路径的切换，从而增大信令开销以及复杂度。因此，在本发明中，在UE从第一基站控制的第一小区切换到第二基站控制的第二小区的切换过程中，数据仍从服务网关发向第一基站，第一基站收到这些数据后发送给第二基站，这样，在UE返回第一基站时，也不需要进行相应的服务网关到基站的数据路径切换，以避免频繁的数据路径切换，减少相应的信令开销以及复杂度。
步骤202、用户设备根据指示信息向第一基站发送上行信号，以使第一基站根据上行信号获取用户设备的时间提前量TA或TA偏移值。
在本实施例中，在UE执行完步骤201后，在本步骤中，第二小区是UE的服务小区，第一小区不再是该UE的服务小区。上行信号包括随机接入前导信号或探测参考信号或调度请求(Scheduling Request；简称：SR)信号。UE为了根据获取到的指示信息建立和/或维持与第一小区的上行同步，需要定时或不定时地向第一基站发送上行信号，也即在第一小区上发送上行信号。因此，指示信息可以包括以下信息中的一个或多个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、第一基站分配的UE在第一小区中的小区无线网络临时标识(Cell Radio Network Temporary Identifier；简称：C-RNTI)。其中，探测参考信号配置信息用于使UE获知在哪些资源上向第一小区发送探测参考信号以建立和/或维持上行同步；随机接入前导信息用于使UE获知在发起随机接入信道(Random Access Channel；简称：RACH)时，需要使用哪个随机接入前导资源，即第一基站给UE分配并保留一个专用的随机接入前导资源；第一基站分配的UE在第一小区中的C-RNTI用于使UE接入第一小区；另外，为了使UE能随时转换到第一小区进行数据传输，该指示信息还可以包括SR配置信息，其用于指示UE从第二小区转换到第一小区后使用SR配置信息指示的SR资源向第一小区发送SR请求数据调度，另外，SR配置信息还用于通知第一小区，该UE已经从第二小区转换到了第一小区；进一步地，UE有可能不支持上行CA，因此当UE在第二基站进行数据传输期间，为了与第一基站保持上行同步，需要一个上 行同步间隙，该上行同步间隙用于指示UE在该上行同步间隙期间转到第一小区上发送上行信号，因此，该指示信息还可以包括：上行同步间隙配置信息。
需要进行说明的是，指示信息中的上行同步间隙配置信息可以由第一基站确定，并携带在第三切换消息中发送给第二基站，以通知第二基站UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据；该上行同步间隙配置信息也可以由第二基站确定，并携带在切换响应消息中发送给第一基站。值得注意的是，也可以不在指示信息中包括上行同步间隙配置信息，而是UE在探测参考信号配置信息中指示的资源所处的时间段转到第一小区上发送探测参考信号，而且第二基站在该资源所处的时间段不调度UE的下行数据。此时，为了通知第二基站UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据，第一基站可以将该探测参考信号配置信息携带在第三切换消息中发送给第二基站。
如果UE不支持上行CA，则UE在上行同步间隙期间或者在探测参考信号配置信息中指示的资源所处的时间段发送上行信号，第二基站则在UE发送上行信号期间不调度该UE。
UE根据指示信息向第一基站发送上行信号后，第一基站根据接收到的上行信号获取该UE的时间提前量(Timing Advance；简称：TA)或TA偏移值。
步骤203、用户设备接收第一基站或第一基站通过第二基站发送的TA或TA偏移值，并根据TA或TA偏移值建立和/或维持UE与第一小区的上行同步。
在本实施例中，当第一基站获取到UE的TA或TA偏移值之后，可以直接通过第一小区将TA或TA偏移值发送给UE，也可以先将该TA或TA偏移值发送给第二基站，再由第二基站转发给UE，对于TA或TA偏移值的具体的发送方式，本发明不作特别限制。
步骤204、用户设备从第二小区转换到与用户设备处于上行同步的第一小区，并基于第一小区进行通信。
在本实施例中，若UE与第二小区之间发生无线链路失败，或UE接收到第二基站发送的用于指示UE从第二基站控制的第二小区切换到第一基站控 制的第一小区的第二切换消息后，UE需要回到第一小区进行数据传输，此时UE根据其与第一小区的上行同步，不需要向第一小区发起随机接入过程，即可从第二基站控制的第二小区快速转换到第一基站控制的第一小区。
步骤205、用户设备通过第一小区向第一基站发送SR消息，SR消息用于请求第一基站对用户设备进行数据调度。
在本实施例中，当UE从第二小区转换到第一小区后，UE基于第一小区向第一基站发送SR消息，以请求第一基站对该UE进行数据调度，或者通知第一基站，UE已回到第一小区进行数据传输。
本发明实施例提供的通信方法，通过接收指示信息，当UE根据该指示信息与第一小区处于上行同步时，UE处于无线资源控制RRC连接态，UE的服务小区为第二基站控制的第二小区，UE从第二小区转换到与UE处于上行同步的第一小区，并基于第一小区进行通信。由于UE在基于第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，当UE需要通过第一小区进行通信时，不需要执行随机接入过程即可快速转到第一小区，减少了UE在小区之间进行转换而引起的数据传输中断时间，从而提高了用户体验。另外，由于UE在发现满足触发条件的第二小区之后，从第一小区切换到第二小区进行数据通信，可以降低UE的功耗，减少对其他UE的干扰，而当UE与第二小区之间发生无线链路失败，或UE接收到第二基站发送的用于指示UE从第二基站控制的第二小区切换到第一基站控制的第一小区的第二切换消息后，UE可以不需要发起随机接入过程即可转到第一小区上进行通信，减少了数据中断的时间，从而提高了用户的体验。
图3为本发明通信方法实施例三的流程示意图，本实施例在基于图1所示实施例的基础上，对UE与第二基站控制的第二小区建立初始连接的实施例，做详细说明。如图3所示，本实施例的方法可以包括：
步骤301、用户设备接收第二基站发送的指示信息。
在本实施例中，UE与第二基站控制的第二小区建立初始连接，即第二小区为UE的当前服务小区，第一基站控制的第一小区不是UE的服务小区，由于第二基站的覆盖范围较小，UE在进入小基站的覆盖范围后，很可能很快又移出了小基站的覆盖范围，此时，会造成UE在小区之间进行频繁的切换，增加了数据中断的时间，而且增大了切换失败的概率。为了解决这一问题， 在本实施例中，UE与第二基站控制的第二小区建立初始连接后，第二基站会向第一基站发送请求消息，以请求第一基站允许UE建立和/或维持与第一基站控制的第一小区之间的上行同步，其中，该请求消息例如可以为上行同步请求消息。可选地，该请求消息中携带有该UE的上下文信息，以使得后续UE转到第一基站后能基于这些上下文信息与第一基站进行通信。
第一基站根据接收到的请求消息向第二基站返回响应消息，该请求消息中携带第一基站为UE分配的在第一小区上的C-RNTI，第二基站接收到响应消息后，向UE发送指示信息。
步骤302、用户设备根据指示信息向第一基站发送上行信号，以使第一基站根据上行信号获取用户设备的时间提前量TA或TA偏移值。
步骤303、用户设备接收第一基站或第一基站通过第二基站发送的TA或TA偏移值，并根据TA或TA偏移值建立和/或维持用户设备与第一小区的上行同步。
步骤304、用户设备从第二小区转换到与用户设备处于上行同步的第一小区，并基于第一小区进行通信。
步骤305、用户设备通过第一小区向第一基站发送SR消息，SR消息用于请求第一基站对用户设备进行数据调度。
步骤302-步骤305与步骤202-步骤205类似，此处不再赘述。
本发明实施例提供的通信方法，通过接收指示信息，当UE根据该指示信息与第一小区处于上行同步时，UE处于无线资源控制RRC连接态，UE的服务小区为第二基站控制的第二小区，UE从第二小区转换到与UE处于上行同步的第一小区，并基于第一小区进行通信。由于UE在基于第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，当UE需要通过第一小区进行通信时，不需要执行随机接入过程即可快速转到第一小区，减少了UE在小区之间进行转换而引起的数据传输中断时间，从而提高了用户体验。另外，当UE与第二小区之间发生无线链路失败，或UE接收到第二基站发送的用于指示UE从第二基站控制的第二小区切换到第一基站控制的第一小区的第二切换消息后，UE可以不需要发起随机接入过程即可转到第一小区上进行通信，减少了数据中断的时间，从而提高了用户的体验。
图4为本发明通信方法实施例四的流程示意图。本发明实施例提供了一 种通信方法，该方法可以由任意执行通信方法的装置来执行，该装置可以通过软件和/或硬件实现。本实施例中，该装置可以集成在基站中。如图4所示，本实施例的方法可以包括：
步骤401、第一基站向用户设备发送第一切换消息，第一切换消息用于指示用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；第一切换消息包括指示信息，该指示信息用于指示用户设备建立和/或维持用户设备与第一小区的上行同步。
在本实施例中，UE若与第一基站控制的第一小区建立初始连接，即第一小区为UE的当前服务小区时，由于第一基站为宏基站，其覆盖范围较大，导致UE在第一基站下进行数据通信时的功耗较大，因此，UE会被配置测量任务，以发现满足测量触发条件的第二小区，其中，满足测量触发条件的第二小区为信号质量较好的小基站控制的第二小区。在具体的实现过程中，UE可以测量各小区的RSRP值，并判断该值是否大于预设阈值，若大于预设阈值，则说明该RSRP值对应的小区满足测量触发条件。其中，预设阈值可以根据实际情况进行设定，对于预设阈值的具体取值，本发明不作特别限制。在UE发现满足测量触发条件的第二小区之后，UE向第一基站发送测量报告，第一基站根据UE发送的测量报告，决定将UE切换到第二基站进行通信，此时，第一基站会向UE发送携带指示信息的第一切换消息，以使UE从第一基站控制的第一小区切换到第二基站控制的第二小区，包括发起随机接入过程等，其中，该指示信息用于指示UE在切换完成后建立和/或维持与第一小区的上行同步。需要进行说明的是，当UE根据指示信息与第一小区处于上行同步时，UE处于RRC连接态，而且此时UE的服务小区为第二基站控制的第二小区。由于第二基站为小基站，其覆盖范围较小，因此，当UE在第二基站中进行数据传输时，可以达到省电的目的。此外，与现有技术中的切换过程相比，第一基站向UE发送携带指示信息的第一切换消息后，仍然保留UE的上下文信息，在后续UE回到第一基站后能基于这些上下文信息与UE进行通信；同理，UE在收到携带指示信息的第一切换消息后，也保留当前的UE上下文信息，在后续UE回到第一基站后能基于这些上下文信息与第一基站进行通信。
在现有技术中，若UE从第一基站控制的第一小区切换到第二基站控制 的第二小区之后，数据将从服务网关发向第一基站改为从服务网关发向第二基站。可选地，由于第二基站是覆盖范围小的小基站，可能UE很快就又回到第一基站，如此频繁的进行数据路径的切换，会增大信令开销以及复杂度。因此，在本发明中，当UE从第一基站控制的第一小区切换到第二基站控制的第二小区的切换过程中，数据仍从服务网关发向第一基站，第一基站收到这些数据后发给第二基站，这样，在UE返回第一基站时，也不需要进行相应的服务网关到基站的数据路径切换，以避免频繁的数据路径切换，减少相应的信令开销以及复杂度。
步骤402、第一基站在用户设备根据用户设备从第二小区转换到与用户设备处于上行同步的第一小区时，基于第一小区与用户设备进行通信。
在本实施例中，当UE从第二小区转换到第一小区后，UE会在第一小区上向第一基站发送SR消息，以请求第一基站对该UE进行数据调度，从而进行数据通信。
本发明实施例提供的通信方法，通过向UE发送第一切换消息，以使UE从第一基站控制的第一小区切换到第二基站控制的第二小区，在UE从第二小区转换到与用户设备处于上行同步的第一小区时，基于第一小区与UE进行通信。由于UE在通过第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，使得UE在不需要执行随机接入过程即可快速转到第一小区上进行通信，减少了UE在小区之间切换而引起的数据传输中断时间，从而提高了用户体验。
图5为本发明通信方法实施例五的流程示意图，本实施例在基于图4所示实施例的基础上，对UE建立和/或维持与第一基站的上行同步的实施例，做详细说明。如图5所示，本实施例的方法可以包括：
步骤501、第一基站向第二基站发送第三切换消息，第三切换消息用于请求第二基站允许在用户设备从第一小区切换到第二小区后建立和/或维持与第一小区的上行同步。
在本实施例中，在UE发现满足测量触发条件的第二小区，并向第一基站发送测量报告之后，第一基站根据UE发送的测量报告，决定将UE切换到第二基站进行通信，此时，第一基站会向第二基站发送第三切换消息，其中，第三切换消息中携带有请求信息，该请求信息用于请求第二基站允许在UE 从第一小区切换到第二小区后建立和/或维持与第一小区的上行同步。该第三切换消息包括以下一个或多个信息：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。其中，探测参考信号配置信息用于使UE获知在哪些资源上向第一小区发送探测参考信号以建立和/或维持上行同步；SR配置信息用于指示UE从第二小区转换到第一小区后使用SR配置信息指示的SR资源向第一小区发送SR请求数据调度，另外，SR配置信息还用于通知第一小区，该UE已经转换从第二小区转换到了第一小区；进一步地，UE有可能不支持上行CA，因此当UE在第二基站进行数据传输期间，为了与第一基站保持上行同步，需要一个上行同步间隙，该上行同步间隙用于指示UE在该间隙期间转到第一小区上发送上行信号，因此，该指示信息还可以包括：上行同步间隙配置信息。
需要进行说明的是，指示信息中的上行同步间隙配置信息可以由第一基站确定，并携带在第三切换消息中发送给第二基站，以通知第二基站，UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据；该上行同步间隙配置信息也可以由第二基站确定，并携带在切换响应消息中发送给第一基站。值得注意的是，也可以不在指示信息中包括上行同步间隙配置信息，而是UE在探测参考信号配置信息中指示的资源所处的时间段转到第一小区上发送探测参考信号，而且第二基站在该资源所处的时间段不调度UE的下行数据。此时，为了通知第二基站，UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据，第一基站可以将该探测参考信号配置信息携带在第三切换消息中发送给第二基站。
步骤502、第一基站接收第二基站根据第三切换消息返回的切换响应消息，并根据切换响应消息向用户设备发送第一切换消息，第一切换消息用于指示用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；第一切换消息包括指示信息，该指示信息用于指示用户设备建立和/或维持用户设备与第一小区的上行同步。
步骤502与步骤401类似，此处不再赘述。
步骤503、第一基站基于第一小区接收用户设备根据指示信息发送的上行信号，并根据上行信号获取用户设备的时间提前量TA或TA偏移值。
在本实施例中，上行信号包括随机接入前导信号或探测参考信号或SR 信号。UE为了根据接收到的指示信息建立和/或维持与第一小区的上行同步，需要定时或不定时地向第一基站发送上行信号。因此，指示可以包括以下信息中的一个或多个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的UE在第一小区中的C-RNTI。其中，探测参考信号配置信息用于使UE获知在哪些资源上向第一小区发送探测参考信号以建立和/或维持上行同步；随机接入前导信息用于使UE获知在发起RACH时，需要使用哪个随机接入前导资源，即第一基站给UE分配并保留一个专用的随机接入前导资源；第一基站分配的UE在第一小区中的C-RNTI用于使UE接入第一小区；另外，为了使UE能随时转换到第一小区进行数据传输，该指示信息还可以包括SR配置信息，其用于指示UE从第二小区转换到第一小区后使用SR配置信息指示的SR资源向第一小区发送SR请求数据调度，另外，SR配置信息还用于通知第一小区，该UE已经转换从第二小区转换到了第一小区；进一步地，有可能UE不支持上行CA，因此当UE在第二基站进行数据传输期间，为了与第一基站保持上行同步，需要一个上行同步间隙，该上行同步间隙用于指示UE在该间隙期间转到第一小区上发送上行信号，因此，该指示信息还可以包括：上行同步间隙配置信息。
需要进行说明的是，指示信息中的上行同步间隙配置信息可以由第一基站确定，并携带在第三切换消息中发送给第二基站，以通知第二基站，UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据；该上行同步间隙配置信息也可以由第二基站确定，并携带在切换响应消息中发送给第一基站。值得注意的是，也可以不在指示信息中包括上行同步间隙配置信息，而是UE在探测参考信号配置信息中指示的资源所处的时间段转到第一小区上发送探测参考信号，而且第二基站在该资源所处的时间段不调度UE的下行数据。此时，为了通知第二基站，UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据，第一基站可以将该探测参考信号配置信息携带在第三切换消息中发送给第二基站。
第一基站接收到UE发送的上行信号之后，根据该上行信号获取UE的TA或TA偏移值。
步骤504、第一基站向用户设备发送TA或TA偏移值，TA或TA偏移值 用于使用户设备建立和/或维持用户设备与第一小区的上行同步。
在本实施例中，第一基站获取到UE的TA或TA偏移值之后，可以直接通过第一小区将TA或TA偏移值发送给UE，也可以先将该TA或TA偏移值发送给第二基站，再由第二基站转发给UE，对于TA或TA偏移值的具体的发送方式，本发明不作特别限制。
步骤505、第一基站在用户设备从第二小区转换到与用户设备处于上行同步的第一小区时，基于第一小区与用户设备进行通信。
在本实施例中，若UE与第二小区之间发生无线链路失败，或UE接收到第二基站发送的用于指示UE从第二基站控制的第二小区切换到第一基站控制的第一小区的第二切换消息后，UE需要回到第一小区进行数据传输，此时UE根据其与第一小区的上行同步，不需要向第一小区发起随机接入过程，即可从第二基站控制的第二小区快速转换到第一基站控制的第一小区。当UE从第二小区转换到第一小区后，UE会在第一小区上向第一基站发送SR消息，以请求第一基站对该UE进行数据调度，以进行通信。
本发明实施例提供的通信方法，通过向UE发送第一切换消息，以使UE从第一基站控制的第一小区切换到第二基站控制的第二小区，在UE从第二小区转换到与用户设备处于上行同步的第一小区时，基于第一小区与UE进行通信。由于UE在通过第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，使得UE在不需要执行随机接入过程即可快速转到第一小区上进行通信，减少了UE在小区之间进行切换引起的数据传输中断时间，从而提高了用户体验。另外，由于UE在发现满足触发条件的第二小区之后，从第一小区切换到第二小区进行数据通信，可以降低UE的功耗，减少对其他UE的干扰，而当UE与第二小区之间发生无线链路失败，或UE接收到第二基站发送的用于指示UE从第二基站控制的第二小区切换到第一基站控制的第一小区的第二切换消息后，UE可以不需要发起随机接入过程即可转到第一小区上进行通信，减少了数据中断的时间，从而提高了用户的体验。
可选地，第一基站在用户设备从第一小区切换到第二小区之后，保存用户设备的上下文信息。
具体地，若UE发现满足测量触发条件的第二小区，并从第一小区切换到第二小区之后，第一基站会维护UE的上下文信息，例如UE的C-RNTI， 以使UE可以随时接入到第一基站进行数据传输。
图6为本发明通信方法实施例六的信令示意图，本实施例中以UE与第一基站控制的第一小区建立初始连接为例详细阐述本发明的技术方案，如图6所示，本实施例的方法可以包括：
步骤601、UE与第一基站控制的第一小区建立初始连接。
步骤602、UE被配置测量任务，以发现满足测量触发条件的第二小区。
步骤603、UE向第一基站发送测量报告。
步骤604、第一基站向第二基站发送第三切换消息，以请求第二基站允许在UE从第一小区切换到第二小区后建立和/或维持与第一小区的上行同步。
步骤605、第一基站接收第二基站根据第三切换消息返回的切换响应消息。
步骤606、第一基站向UE发送第一切换消息，以使UE从第一基站控制的第一小区切换到第二基站控制的第二小区。
步骤607、第一基站维护UE的上下文信息。
步骤608、UE切换到第二基站。
步骤609、UE与第二基站进行通信。
步骤610、第一基站通过第一小区接收UE根据指示信息发送的上行信号。
步骤611、第一基站根据上行信号获取UE的时间提前量TA或TA偏移值。
步骤612、第一基站向UE发送TA或TA偏移值。
步骤613、UE根据TA或TA偏移值建立和/或维持UE与第一小区的上行同步。
步骤614、UE从第二基站控制的第二小区转换到第一基站控制的第一小区。
步骤615、UE在第一小区上向第一基站发送SR消息。
步骤616、UE与第一基站进行通信。
本发明实施例提供的通信方法，通过向UE发送第一切换消息，以使UE从第一基站控制的第一小区切换到第二基站控制的第二小区，在UE从第二小区转换到与用户设备处于上行同步的第一小区时，基于第一小区与UE进 行通信。由于UE在通过第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，使得UE在不需要执行随机接入过程即可快速转到第一小区上进行通信，减少了UE在小区之间进行切换引起的数据传输中断时间，从而提高了用户体验。
图7为本发明通信方法实施例七的流程示意图。本发明实施例提供了一种通信方法，该方法可以由任意执行通信方法的装置来执行，该装置可以通过软件和/或硬件实现。本实施例中，该装置可以集成在基站中。如图7所示，本实施例的方法可以包括：
步骤701、第二基站向用户设备发送指示信息，该指示信息用于指示用户设备建立和/或维持用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，用户设备从第二基站控制的第二小区转换到与用户设备处于上行同步的第一小区。
在本实施例中，UE若与第二基站控制的第二小区建立初始连接时，第二基站会向UE发送指示信息，UE接收到该指示信息之后，根据该指示信息建立和/或维持其与第一基站控制的第一小区的上行同步，以在需要从第二小区转换到第一小区时，可以不发起随机接入过程，直接根据其与第二小区的上行同步，从第二小区转换到第一小区，以进行数据传输。需要进行说明的是，当UE根据该指示信息与第一小区处于上行同步时，UE处于RRC连接态，而且此时UE的服务小区为第二基站控制的第二小区。
本发明实施例提供的通信方法，通过向UE发送指示信息，该指示信息用于指示UE建立和/或维持UE与第一基站控制的第一小区的上行同步，以使当发生转换时，用户设备从第二基站控制的第二小区转换到与用户设备处于上行同步的第一小区。由于UE在通过第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，使得UE在不需要执行随机接入过程即可快速转到第一小区上进行通信，减少了UE在小区之间进行切换引起的数据传输中断时间，从而提高了用户体验。
可选地，在上述实施例的基础上，第二基站向第一基站发送切换请求，该切换请求用于将用户设备从第二小区转换到与用户设备处于上行同步的第一小区，且用户设备基于第一小区进行通信。
具体地，UE若与第二基站控制的第二小区建立初始连接时，第二基站还 可以通过向第一基站发送切换请求，以通知第一基站将UE从第二小区转换到与该UE处于上行同步的第一小区，使UE基于第一小区进行通信。需要进行说明的是，此步骤可以在步骤701之前执行，也可以在步骤702之后执行，本实施例对此不作限制。
可选地，在上述实施例的基础上，第二基站接收用户设备根据指示消息返回的指示响应消息，指示响应消息用于指示用户设备已经接收到指示信息。
具体地，UE在接收到第二基站发送的指示信息后，会向第二基站返回指示响应消息，以通知第二基站，该UE已经接收到其发送的指示信息。
图8为本发明通信方法实施例八的流程示意图，本实施例在基于图7所示实施例的基础上，对UE与第二基站控制的第二小区建立初始连接的实施例，做详细说明。如图8所示，本实施例的方法可以包括：
步骤801、第二基站向第一基站发送请求消息，该请求消息用于请求第一小区允许用户设备建立和/或维持用户设备与第一小区的上行同步。
在本实施例中，UE与第二基站控制的第二小区建立初始连接，即第二小区为UE的当前服务小区，第一基站控制的第一小区不是UE的服务小区，由于第二基站的覆盖范围较小，UE在进入小基站的覆盖范围后，很可能很快又移出了小基站的覆盖范围，此时，会造成UE在小区之间进行频繁的切换，增加了数据中断的时间，而且增大了切换失败的概率。为了解决这一问题，在本实施例中，UE在第二基站控制的第二小区上进行数据发送时，第二基站会向第一基站发送请求消息，以请求第一基站允许UE建立和/或维持与第一基站控制的第一小区的上行同步。可选地，该请求消息中携带有该UE的上下文信息，以标识该UE，例如上下文信息可以为C-RNTI。
步骤802、第二基站接收第一基站根据请求消息发送的响应消息，并根据响应消息向用户设备发送指示信息。
在本实施例中，第一基站根据接收到的请求消息，向第二基站返回响应消息，第二基站接收到响应消息后，向UE发送指示信息。其中，指示信息可以包括以下信息中的一个或多个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述UE在所述第一小区中的小区无线网络临时标识C-RNTI。其中，探测参考信号配置信息用于使UE获知在哪些资源上向第一小区发送探测参考信号以建立和/ 或维持上行同步；随机接入前导信息用于使UE获知在发起RACH时，需要使用哪个随机接入前导资源，即第一基站给UE分配并保留一个专用的随机接入前导资源；第一基站分配的UE在第一小区中的C-RNTI用于使UE接入第一小区；另外，为了使UE能随时转换到第一小区进行数据传输，该指示信息还可以包括SR配置信息，其用于指示UE从第二小区转换到第一小区后使用SR配置信息指示的SR资源向第一小区发送SR请求数据调度，另外，SR配置信息还用于通知第一小区，该UE已经转换从第二小区转换到了第一小区；进一步地，有可能UE不支持上行CA，因此当UE在第二基站进行数据传输期间，为了与第一基站保持上行同步，需要一个上行同步间隙，该上行同步间隙用于指示UE在该间隙期间转到第一小区上发送上行信号，因此，该指示信息还可以包括：上行同步间隙配置信息。
需要进行说明的是，指示信息中的上行同步间隙配置信息可以由第一基站确定，并携带在第三切换消息中发送给第二基站，以通知第二基站，UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据；该上行同步间隙配置信息也可以由第二基站确定，并携带在切换响应消息中发送给第一基站。值得注意的是，也可以不在指示信息中包括上行同步间隙配置信息，而是UE在探测参考信号配置信息中指示的资源所处的时间段内转到第一小区上发送探测参考信号，而且第二基站在该资源所处的时间段不调度UE的下行数据。此时，为了通知第二基站，UE何时可以接收第二小区的下行数据，何时不能接收第二小区发送的下行数据，第一基站可以将该探测参考信号配置信息携带在第三切换消息中发送给第二基站。
本发明实施例提供的通信方法，通过向UE发送指示信息，该指示信息用于指示UE建立和/或维持UE与第一基站控制的第一小区的上行同步，以使UE从第二基站控制的第二小区转换到第一小区，在UE根据UE与第一小区之间的上行同步，从第二小区转换到与用户设备处于上行同步的第一小区时，与UE进行通信。由于UE在通过第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，使得UE在不需要执行随机接入过程即可快速转到第一小区上进行通信，减少了UE在小区之间进行切换而引起的数据传输中断时间，从而提高了用户体验。
可选地，第二基站向UE发送切换消息，切换消息用于使UE从第二小区 转换到与UE保持上行同步的第一小区。
具体地，第二基站可以向UE发送切换消息，以指示UE从第二基站控制的第二小区切换到第一基站控制的第一小区，此时，UE根据其与第一小区的上行同步，不需要向第一小区发起随机接入过程，即可快速从第二基站控制的第二小区转换到第一基站控制的第一小区。
图9为本发明通信方法实施例九的信令示意图，本实施例中以UE与第二基站控制的第二小区建立初始连接为例详细阐述本发明的技术方案，如图9所示，本实施例的方法可以包括：
步骤901、UE与第二基站控制的第二小区建立初始连接。
步骤902、第二基站向第一基站发送请求消息，以请求第一小区允许UE建立和/或维持与第一小区的上行同步。
步骤903、第一基站向第二基站发送响应消息。
步骤904、第二基站根据响应消息向UE发送指示信息。
步骤905、第一基站通过第一小区接收UE根据指示信息发送的上行信号。
步骤906、第一基站根据上行信号获取UE的时间提前量TA或TA偏移值。
步骤907、第一基站向UE发送TA或TA偏移值。
步骤908、UE根据TA或TA偏移值建立和/或维持与第一小区的上行同步。
步骤909、UE从第二基站控制的第二小区转换到第一基站控制的第一小区。
步骤910、UE在第一小区上向第一基站发送SR消息。
步骤911、UE与第一基站进行数据通信。
本发明实施例提供的通信方法，通过向UE发送指示信息，该指示信息用于指示UE建立和/或维持UE与第一基站控制的第一小区的上行同步，以使UE从第二基站控制的第二小区转换到第一小区。由于UE在通过第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，使得UE在不需要执行随机接入过程即可快速转到第一小区上进行通信，减少了UE在小区之间进行切换而引起的数据传输中断时间，从而提高了用户体验。
图10为本发明用户设备实施例一的结构示意图，如图10所示，本发明 实施例提供的用户设备包括接收单元11和处理单元12。
其中，接收单元11用于接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；处理单元12用于从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区，并基于所述第一小区进行通信；
其中，当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区。
本发明实施例提供的用户设备，通过接收指示信息，当UE根据该指示信息与第一小区处于上行同步时，UE处于无线资源控制RRC连接态，UE的服务小区为第二基站控制的第二小区，UE从第二小区转换到与UE处于上行同步的第一小区，并基于第一小区进行通信。由于UE在基于第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，当UE需要基于第一小区进行通信时，不需要执行随机接入过程即可快速转到第一小区，减少了UE在小区之间转换引起的数据传输中断时间，从而提高了用户体验。
可选地，所述接收单元11具体用于：
接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
可选地，所述接收单元11具体用于：
接收所述第二基站发送的所述指示信息。
图11为本发明用户设备实施例二的结构示意图，如图11所示，本实施例在图10所示实施例的基础上，所述用户设备还包括发送单元13。
所述发送单元13用于根据所述指示信息向所述第一基站发送上行信号，以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述接收单元11还用于接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值；
所述处理单元12用于根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区的上行同步。
可选地，所述发送单元13发送的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
可选地，所述接收单元11接收的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
可选地，所述接收单元11还用于接收所述第二基站发送的第二切换消息；
所述处理单元12具体用于：
若所述用户设备与所述第二小区之间发生无线链路失败，或所述接收单元11接收到所述第二基站发送的第二切换消息时，从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
可选地，所述发送单元13还用于通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
本实施例的用户设备，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
图12为本发明基站实施例一的结构示意图，如图12所示，本发明实施例提供的基站包括发送单元21和处理单元22。
其中，发送单元21用于向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与所述第一小区的上行同步；处理单元22用于在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
本发明实施例提供的基站，通过向UE发送第一切换消息，以使UE从第一基站控制的第一小区切换到第二基站控制的第二小区，在UE从第二小区转换到与用户设备处于上行同步的第一小区时，基于第一小区与UE进行通信。由于UE在通过第二小区进行数据传输时，与第一小区建立和/或维持着上行同步，使得UE在不需要执行随机接入过程即可转到第一小区上进行通 信，减少了UE在小区之间切换而引起的数据传输中断时间，从而提高了用户体验。
图13为本发明基站实施例二的结构示意图，如图13所示，本实施例在图12所示实施例的基础上，所述基站包括接收单元23。
其中，所述接收单元23用于基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；所述发送单元21还用于向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一小区的上行同步。
可选地，所述接收单元23接收的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
可选地，所述基站还包括：保存单元24；其中，
所述保存单元24用于在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
可选地，所述发送单元21发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
可选地，所述发送单元21还用于向所述第二基站发送第三切换消息，所述第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区之间的上行同步；
所述接收单元23还用于接收所述第二基站根据所述第三切换消息返回的切换响应消息。
可选地，所述发送单元21发送的第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
本实施例的基站，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
图14为本发明基站实施例三的结构示意图，如图14所示，本发明实施例提供的基站包括发送单元31。
其中，发送单元31用于向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
可选地，所述发送单元31发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
可选地，所述发送单元31还用于向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区。
图15为本发明基站实施例四的结构示意图，如图15所示，本实施例在图14所示实施例的基础上，所述基站包括接收单元32。
所述发送单元31还用于向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
所述接收单元32还用于接收所述第一基站根据所述请求消息发送的响应消息。
本实施例的基站，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
图16为本发明用户设备实施例一的结构示意图，如图16所示，本发明实施例提供的用户设备包括接收器51和处理器52。
其中，接收器51用于接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；处理器52用于从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区，并基于所述第一小区进行通信；
其中，当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区。
本实施例提供的用户设备，可以用于执行本发明任意实施例所提供的通 信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
可选地，所述接收器51具体用于：接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
可选地，所述接收器51具体用于：接收所述第二基站发送的所述指示信息。
本实施例提供的用户设备，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
图17为本发明用户设备实施例二的结构示意图，如图17所示，本实施例在图16所示实施例的基础上，所述用户设备包括发送器53。
其中，所述发送器53用于根据所述指示信息向所述第一基站发送上行信号，以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述接收器51还用于接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值；
所述处理器52还用于根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区的上行同步。
可选地，所述发送器53发送的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
可选地，所述接收器51接收的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
可选地，所述接收器51还用于接收所述第二基站发送的第二切换消息；
所述处理器52还用于若所述用户设备与所述第二小区之间发生无线链路失败，或所述接收器接收到所述第二基站发送的第二切换消息，从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
可选地，所述发送器53还用于通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
本实施例提供的用户设备，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
图18为本发明基站实施例一的结构示意图，如图18所示，本发明实施例提供的基站包括发送器71和处理器72。
其中，发送器71用于向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与所述第一小区之间的上行同步；处理器72用于在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
本实施例提供的基站，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
图19为本发明基站实施例二的结构示意图，如图19所示，本实施例在图18所示实施例的基础上，所述基站包括接收器73。
其中，所述接收器73用于基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
所述发送器71还用于向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一小区之间的上行同步。
可选地，所述接收器73接收的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
可选地，所述基站还包括存储器74；
所述存储器74用于在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
可选地，所述发送器71发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
可选地，所述发送器71还用于向所述第二基站发送第三切换消息，所述 第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区之间的上行同步；
所述接收器73还用于接收所述第二基站根据所述第三切换消息返回的切换响应消息。
可选地，所述发送器71发送的第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
本实施例提供的基站，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
图20为本发明基站实施例三的结构示意图，如图20所示，本发明实施例提供的基站包括发送器91。
其中，发送器91用于向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
本实施例提供的基站，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
可选地，所述发送器91发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
可选地，所述发送器91还用于向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区。
图21为本发明基站实施例四的结构示意图，如图21所示，本实施例在图20所示实施例的基础上，所述基站还包括接收器92。
所述发送器91还用于向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
所述接收器92还用于接收所述第一基站根据所述请求消息发送的响应 消息。
本实施例提供的基站，可以用于执行本发明任意实施例所提供的通信方法的技术方案，其实现原理和技术效果类似，此处不再赘述。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读 存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (57)

  1. 一种通信方法，其特征在于，包括：
    用户设备接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；
    当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区；
    所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区，并基于所述第一小区进行通信。
  2. 根据权利要求1所述的方法，其特征在于，所述用户设备接收指示信息，包括：
    所述用户设备接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
  3. 根据权利要求1所述的方法，其特征在于，所述用户设备接收指示信息，包括：
    所述用户设备接收所述第二基站发送的所述指示信息。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，还包括：
    所述用户设备根据所述指示信息向所述第一基站发送上行信号，以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
    所述用户设备接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值，并根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区的上行同步。
  5. 根据权利要求4所述的方法，其特征在于，所述上行信号包括：
    随机接入前导信号或探测参考信号或调度请求SR信号。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述指示信息包括以下信息中的至少一个：
    探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无 线网络临时标识C-RNTI。
  7. 根据权利要求1-6任一项所述的方法，其特征在于，所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区，具体包括：
    若所述用户设备与所述第二小区之间发生无线链路失败，或所述用户设备接收到所述第二基站发送的第二切换消息，所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；
    其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
  8. 根据权利要求1-7任一项所述的方法，其特征在于，还包括：
    所述用户设备通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
  9. 一种通信方法，其特征在于，包括：
    第一基站向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与所述第一小区的上行同步；
    所述第一基站在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
  10. 根据权利要求9所述的方法，其特征在于，还包括：
    所述第一基站基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
    所述第一基站向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一小区的上行同步。
  11. 根据权利要求10所述的方法，其特征在于，所述上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
  12. 根据权利要求9-11任一项所述的方法，其特征在于，所述方法还包括：
    所述第一基站在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
  13. 根据权利要求9-12任一项所述的方法，其特征在于，所述指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  14. 根据权利要求9-13任一项所述的方法，其特征在于，所述第一基站向用户设备发送第一切换消息之前，所述方法还包括：
    所述第一基站向所述第二基站发送第三切换消息，所述第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区的上行同步；
    所述第一基站接收所述第二基站根据所述第三切换消息返回的切换响应消息。
  15. 根据权利要求14所述的方法，其特征在于，所述第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
  16. 一种通信方法，其特征在于，包括：
    第二基站向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
  17. 根据权利要求16所述的方法，其特征在于，所述指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  18. 根据权利要求16或17所述的方法，其特征在于，所述方法还包括：
    所述第二基站向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区。
  19. 根据权利要求16-18任一项所述的方法，其特征在于，所述第二基 站向用户设备发送指示信息之前，所述方法还包括：
    所述第二基站向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
    所述第二基站接收所述第一基站根据所述请求消息发送的响应消息。
  20. 一种用户设备，其特征在于，包括：
    接收单元，用于接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；
    处理单元，用于从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区，并基于所述第一小区进行通信；
    其中，当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区。
  21. 根据权利要求20所述的用户设备，其特征在于，所述接收单元具体用于：
    接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
  22. 根据权利要求20所述的用户设备，其特征在于，所述接收单元具体用于：
    接收所述第二基站发送的所述指示信息。
  23. 根据权利要求20-22任一项所述的用户设备，其特征在于，所述用户设备还包括：发送单元；其中，
    所述发送单元，用于根据所述指示信息向所述第一基站发送上行信号，以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
    所述接收单元，还用于接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值；
    所述处理单元，用于根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区的上行同步。
  24. 根据权利要求23所述的用户设备，其特征在于，所述发送单元发送 的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
  25. 根据权利要求20-24任一项所述的用户设备，其特征在于，所述接收单元接收的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  26. 根据权利要求20-25任一项所述的用户设备，其特征在于，所述接收单元，还用于接收所述第二基站发送的第二切换消息；
    所述处理单元具体用于：
    若所述用户设备与所述第二小区之间发生无线链路失败，或所述接收单元接收到所述第二基站发送的第二切换消息时，从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
  27. 根据权利要求20-26任一项所述的用户设备，其特征在于，所述发送单元，还用于通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
  28. 一种基站，其特征在于，包括：
    发送单元，用于向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与所述第一小区的上行同步；
    处理单元，用于在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
  29. 根据权利要求28所述的基站，其特征在于，所述基站还包括：接收单元；其中，
    所述接收单元，用于基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
    所述发送单元，还用于向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一 小区的上行同步。
  30. 根据权利要求29所述的基站，其特征在于，所述接收单元接收的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
  31. 根据权利要求28-30任一项所述的基站，其特征在于，所述基站还包括：保存单元；其中，
    所述保存单元，用于在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
  32. 根据权利要求28-31任一项所述的基站，其特征在于，所述发送单元发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  33. 根据权利要求28-32任一项所述的基站，其特征在于，所述发送单元，还用于向所述第二基站发送第三切换消息，所述第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区的上行同步；
    所述接收单元，还用于接收所述第二基站根据所述第三切换消息返回的切换响应消息。
  34. 根据权利要求33所述的基站，其特征在于，所述发送单元发送的第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
  35. 一种基站，其特征在于，包括：
    发送单元，用于向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
  36. 根据权利要求35所述的基站，其特征在于，所述发送单元发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  37. 根据权利要求35或36所述的基站，其特征在于，所述发送单元， 还用于向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区。
  38. 根据权利要求35-37任一项所述的基站，其特征在于，所述基站还包括：接收单元；其中，
    所述发送单元，还用于向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
    所述接收单元，还用于接收所述第一基站根据所述请求消息发送的响应消息。
  39. 一种用户设备，其特征在于，包括：
    接收器，用于接收指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步；
    处理器，用于从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区，并基于所述第一小区进行通信；
    其中，当所述用户设备根据所述指示信息与所述第一小区处于上行同步时，所述用户设备处于无线资源控制RRC连接态，所述用户设备的服务小区为第二基站控制的第二小区。
  40. 根据权利要求39所述的用户设备，其特征在于，所述接收器具体用于：
    接收所述第一基站发送的第一切换消息，所述第一切换消息用于指示所述用户设备从所述第一小区切换到所述第二小区，所述第一切换消息包括所述指示信息。
  41. 根据权利要求39所述的用户设备，其特征在于，所述接收器具体用于：
    接收所述第二基站发送的所述指示信息。
  42. 根据权利要求39-41任一项所述的用户设备，其特征在于，所述用户设备还包括：发送器；其中，
    所述发送器，用于根据所述指示信息向所述第一基站发送上行信号，以使所述第一基站根据所述上行信号获取所述用户设备的时间提前量TA或TA偏移值；
    所述接收器，还用于接收所述第一基站或所述第一基站通过所述第二基站发送的所述TA或TA偏移值；
    所述处理器，还用于根据所述TA或TA偏移值建立和/或维持所述用户设备与所述第一小区的上行同步。
  43. 根据权利要求42所述的用户设备，其特征在于，所述发送器发送的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
  44. 根据权利要求39-43任一项所述的用户设备，其特征在于，所述接收器接收的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  45. 根据权利要求39-44任一项所述的用户设备，其特征在于，所述接收器，还用于接收所述第二基站发送的第二切换消息；
    所述处理器，还用于若所述用户设备与所述第二小区之间发生无线链路失败，或所述接收器接收到所述第二基站发送的第二切换消息，从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区；其中，所述第二切换消息用于指示所述用户设备从所述第二小区切换到所述第一小区。
  46. 根据权利要求39-45任一项所述的用户设备，其特征在于，所述发送器，还用于通过所述第一小区向所述第一基站发送SR消息，所述SR消息用于请求所述第一基站对所述用户设备进行数据调度。
  47. 一种基站，其特征在于，包括：
    发送器，用于向用户设备发送第一切换消息，所述第一切换消息用于指示所述用户设备从第一基站控制的第一小区切换到第二基站控制的第二小区；所述第一切换消息包括所述指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与所述第一小区之间的上行同步；
    处理器，用于在所述用户设备从所述第二小区转换到与所述用户设备处于上行同步的所述第一小区时，基于所述第一小区与所述用户设备进行通信。
  48. 根据权利要求47所述的基站，其特征在于，所述基站还包括：接收器；其中，
    所述接收器，用于基于所述第一小区接收所述用户设备根据所述指示信息发送的上行信号，并根据所述上行信号获取所述用户设备的时间提前量TA 或TA偏移值；
    所述发送器，还用于向所述用户设备发送所述TA或TA偏移值，所述TA或TA偏移值用于使所述用户设备建立和/或维持所述用户设备与所述第一小区之间的上行同步。
  49. 根据权利要求48所述的基站，其特征在于，所述接收器接收的上行信号包括：随机接入前导信号或探测参考信号或调度请求SR信号。
  50. 根据权利要求47-49任一项所述的基站，其特征在于，所述基站还包括：存储器；其中，
    所述存储器，用于在所述用户设备从所述第一小区切换到所述第二小区之后，保存所述用户设备的上下文信息。
  51. 根据权利要求47-50任一项所述的基站，其特征在于，所述发送器发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  52. 根据权利要求47-51任一项所述的基站，其特征在于，所述发送器，还用于向所述第二基站发送第三切换消息，所述第三切换消息用于请求所述第二基站允许在所述用户设备从所述第一小区切换到所述第二小区后建立和/或维持与所述第一小区之间的上行同步；
    所述接收器，还用于接收所述第二基站根据所述第三切换消息返回的切换响应消息。
  53. 根据权利要求52所述的基站，其特征在于，所述发送器发送的第三切换消息包括以下信息中的至少一个：探测参考信号配置信息、调度请求SR配置信息、上行同步间隙配置信息。
  54. 一种基站，其特征在于，包括：
    发送器，用于向用户设备发送指示信息，所述指示信息用于指示所述用户设备建立和/或维持所述用户设备与第一基站控制的第一小区的上行同步，以使当发生转换时，所述用户设备从所述第二基站控制的第二小区转换到与所述用户设备处于上行同步的所述第一小区。
  55. 根据权利要求54所述的基站，其特征在于，所述发送器发送的指示信息包括以下信息中的至少一个：探测参考信号配置信息、随机接入前导信 息、SR配置信息、上行同步间隙配置信息、所述第一基站分配的所述用户设备在所述第一小区中的小区无线网络临时标识C-RNTI。
  56. 根据权利要求54或55所述的基站，其特征在于，所述发送器，还用于向所述用户设备发送切换消息，所述切换消息用于使所述用户设备从所述第二小区转换到与所述用户设备保持上行同步的所述第一小区。
  57. 根据权利要求54-56任一项所述的基站，其特征在于，所述基站还包括：接收器；其中，
    所述发送器，还用于向所述第一基站发送请求消息，所述请求消息用于请求所述第一小区允许所述用户设备建立和/或维持与所述第一小区的上行同步；
    所述接收器，还用于接收所述第一基站根据所述请求消息发送的响应消息。
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