WO2012136128A1 - 辅助定时提前量的获取方法和设备 - Google Patents

辅助定时提前量的获取方法和设备 Download PDF

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Publication number
WO2012136128A1
WO2012136128A1 PCT/CN2012/073469 CN2012073469W WO2012136128A1 WO 2012136128 A1 WO2012136128 A1 WO 2012136128A1 CN 2012073469 W CN2012073469 W CN 2012073469W WO 2012136128 A1 WO2012136128 A1 WO 2012136128A1
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WO
WIPO (PCT)
Prior art keywords
random access
cell
terminal
secondary cell
auxiliary
Prior art date
Application number
PCT/CN2012/073469
Other languages
English (en)
French (fr)
Inventor
曾清海
黄曲芳
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
Priority claimed from CN201110084167.7A external-priority patent/CN102740443B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19169416.5A priority Critical patent/EP3598836B1/en
Priority to EP12767658.3A priority patent/EP2685777B1/en
Priority to EP16160252.9A priority patent/EP3125636B1/en
Priority to JP2014501432A priority patent/JP5632560B2/ja
Publication of WO2012136128A1 publication Critical patent/WO2012136128A1/zh
Priority to US14/041,829 priority patent/US9185611B2/en
Priority to US14/874,163 priority patent/US9491778B2/en
Priority to US15/299,274 priority patent/US9967840B2/en
Priority to US15/951,865 priority patent/US10667224B2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • 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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • 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
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for acquiring an auxiliary timing advance. Background technique
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • the terminal of the LTE system synchronizes the uplink transmission with the base station by Timing Advance (TA), and maintains the uplink synchronization by using a Time Alignment Timer (TAT).
  • TA Timing Advance
  • TAT Time Alignment Timer
  • the introduction of the TA enables the uplink transmission of all terminals to be reached at the expected time of the base station, thereby avoiding uplink transmission conflicts between terminals and implementing time division multiplexing.
  • the base station may also configure one or more secondary cells (SCells) to assist the primary cell (PCell) for data transmission, and the primary cell and each secondary cell respectively correspond to one uplink.
  • SCells secondary cells
  • the TA corresponding to the primary cell is called the primary TA
  • the TAT corresponding to the primary cell is called the primary TAT
  • the TA of the secondary cell is called the secondary TA
  • the TAT of the secondary cell is called the secondary TAT.
  • the terminal initiates random access in the secondary cell to acquire the secondary TA of the secondary cell, which may increase the random access process and
  • the TA maintains the signaling overhead in the process and wastes system resources.
  • An embodiment of the present invention provides a method for obtaining an auxiliary timing advance amount, including:
  • the terminal After receiving the secondary cell activation command, or after the secondary cell is activated, if the secondary time alignment timer TAT of the secondary cell is not running, the terminal initiates a random access procedure; the terminal according to the random access procedure The TA received in the middle acquires the auxiliary timing advance TA of the secondary cell.
  • the embodiment of the present invention further provides another method for obtaining an auxiliary timing advance quantity, including: sending a secondary cell activation command to a terminal; and transmitting a TA to the terminal in a random access procedure according to the random access initiated by the terminal; The random access is initiated by the terminal after receiving the auxiliary cell activation command, or after confirming that the secondary cell is activated according to the secondary cell activation command, if the secondary TAT of the secondary cell is not running.
  • the embodiment of the present invention further provides an uplink out-of-synchronization processing method, including: a secondary TAT of a secondary cell that is configured by a terminal; if the TAT of the secondary cell times out, the terminal notifies the base station, and/or stops the secondary cell Uplink transmission, and/or activation of the secondary cell.
  • the embodiment of the invention further provides a terminal, including:
  • a receiving unit configured to receive a secondary cell activation command
  • a random access unit configured to: after the receiving unit receives the secondary cell random access command or after the secondary cell is activated, if the secondary cell's secondary time alignment timer TAT is not running, initiate a random access procedure ;
  • an obtaining unit configured to acquire an auxiliary timing advance TA of the secondary cell according to the TA received in the random access procedure.
  • the embodiment of the invention further provides a base station, including:
  • the first sending unit is configured to send a secondary cell activation command to the terminal.
  • a second sending unit configured to send, according to the random access initiated by the terminal, a TA to the terminal in the random access procedure; where the random access is received by the terminal, the secondary cell activation command After the auxiliary cell activation is confirmed according to the auxiliary cell activation command, If the secondary TAT of the secondary cell is not activated after being initiated.
  • the embodiment of the present invention further provides a terminal, including: a starting unit, configured to start an auxiliary TAT according to the acquired auxiliary TA; and a processing unit, configured to notify the base station to assist the TAT to time out if the auxiliary TAT times out, and/or stop at the auxiliary
  • the secondary cell corresponding to the TAT performs uplink transmission, and/or deactivates the secondary cell corresponding to the secondary TAT.
  • the method and device for acquiring the auxiliary timing advance amount provided by the embodiment of the present invention, after receiving the activation of the secondary cell command, or after the secondary cell is activated, the terminal initiates a random access procedure to obtain the auxiliary timing advance amount, thereby saving signaling overhead. And system resources.
  • FIG. 1 is a flow chart of an embodiment of a method for acquiring an auxiliary timing advance amount provided by the present invention
  • FIG. 2 is a flow chart of another embodiment of a method for acquiring an auxiliary timing advance amount according to the present invention
  • FIG. 3 is a flow chart of still another embodiment of a method for acquiring an auxiliary timing advance amount according to the present invention
  • FIG. 4 is a flow chart of still another embodiment of a method for acquiring an auxiliary timing advance amount according to the present invention.
  • FIG. 5 is a flow chart of still another embodiment of a method for acquiring an auxiliary timing advance amount according to the present invention.
  • FIG. 6 is a flow chart of still another embodiment of a method for acquiring an auxiliary timing advance amount according to the present invention.
  • FIG. 7 is a schematic diagram of obtaining an auxiliary TA in the embodiment provided in Figure 6;
  • FIG. 8 is a flowchart of still another embodiment of a method for acquiring an auxiliary timing advance amount according to the present invention.
  • FIG. 9 is a schematic diagram of obtaining an auxiliary TA in the embodiment provided in FIG. 8;
  • FIG. 10 is a flowchart of an uplink out-of-synchronization processing method provided in an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of an embodiment of a terminal provided by the present invention.
  • FIG. 12 is a schematic structural diagram of another embodiment of a terminal provided by the present invention.
  • FIG. 13 is a schematic structural diagram of an embodiment of a base station provided by the present invention. detailed description
  • the base station may be an evolved Node B (eNB), a base station (BS), a Node B, an access point, and the like.
  • the base station may be a macro base station, a medium base station, or a micro base station, such as a home base station.
  • Each base station can provide communication coverage for a particular geographic area.
  • the term "cell" can be the coverage area of a base station, and/or the coverage area served by a base station subsystem, depending on the context used by the term.
  • the base station can provide communication coverage for macro cells, pico cells, femto cells, and/or other types of cells.
  • the terminals may be distributed in the entire wireless network, and each terminal may be static or mobile.
  • the terminal may be a user equipment (UE), a mobile station (MS), a subscriber unit, a station, or the like.
  • the terminal can also be a cellular phone, a personal digital assistant (PDA), a wireless modem (modem), a wireless communication device, a handheld device, a laptop computer, a cordless device. (cordless phone), wireless local loop (WLL) station, etc.
  • the terminal can communicate with base stations such as a macro base station, a pico base station, and a femto base station.
  • the terminal may further include a communication device that communicates with the base station and has a similar terminal role. For example, when the relay node (RN) initially accesses the network, the RN and the base station access the network as a terminal when communicating.
  • RN relay node
  • FIG. 1 is a flowchart of an embodiment of a method for acquiring an auxiliary timing advance according to the present invention. As shown in FIG. 1, the method includes:
  • the terminal After receiving the secondary cell activation command, or after the secondary cell is activated, if the secondary TAT of the secondary cell is not running, the terminal initiates a random access procedure, and the secondary TA of the secondary cell and the primary TA of the primary cell Different
  • S102 The terminal acquires the auxiliary TA according to the TA received in the random access procedure.
  • the base station can carry the TA in the message 2 of the random access procedure transmitted to the terminal. Terminal acquisition
  • TAT can be started after TA.
  • the terminal is in the uplink synchronization state.
  • the base station may further perform calibration on the TA by sending a Medium Access Control (MAC) layer Timing Advance Command to synchronize the uplink transmission of the terminal with the base station.
  • the terminal restarts the TAT according to the TA calibration value received from the TA command to keep the uplink transmission synchronized with the base station.
  • MAC Medium Access Control
  • the terminal receives the auxiliary cell activation command
  • the secondary cell may be activated, or may not be activated
  • the terminal may receive the secondary cell activation command, whether the secondary cell is activated or not,
  • the secondary TAT of the secondary cell is not running, that is, a random access procedure can be initiated.
  • the terminal may wait for the secondary cell to be activated, and if the secondary TAT of the secondary cell is not running, initiate a random access procedure.
  • the secondary TA of the secondary cell may be different from the primary TA of the primary cell, that is, does not belong to the same TA group (TA Gmup; TAG ).
  • the secondary TAs of the multiple secondary cells may be different from the primary TAs of the primary cell, and the secondary TAs of the secondary cells may be Same.
  • the terminal can ⁇ 1 which has an auxiliary cell PRACH resource as a reference cell, the secondary cell A random access procedure is initiated.
  • PRACH Physical Random Access Channel
  • the terminal may have the PRACH resource.
  • the secondary cell is a reference cell, and a random access procedure is initiated on the secondary cell.
  • the function of the reference cell is that, when the terminal sends a preamble (preamble), the terminal uses the downlink carrier of the reference cell as a reference.
  • the terminal may initiate a random access procedure to obtain the secondary TA of the secondary cell.
  • the terminal may be after the secondary cell activation command is received, or after the secondary cell is activated, if the secondary TAT of the secondary cell is not running, the terminal may initiate random access immediately, or the terminal may not initiate random access, but It can be initiated by the base station, for example, after receiving the secondary cell activation command, or after the secondary cell is activated, the secondary TAT of the secondary cell is not running.
  • the terminal receives the random access command, it is randomly selected. The incoming command initiates a random access procedure.
  • the terminal may use the reference cell according to the indication (that is, the downlink carrier of the reference cell indicated by the base station when the terminal sends the preamble in the process of initiating the random access by the terminal)
  • the method of the random access procedure is initiated on the secondary cell with the PRACH resource.
  • the terminal may use the cell carrying the random access command as the reference cell, and the cell that carries the random access command.
  • a random access procedure is initiated.
  • the terminal may further set a random access timer.
  • the secondary TAT of the secondary cell After receiving the secondary cell activation command, or after the secondary cell is activated, the secondary TAT of the secondary cell is not running, if the random access timer is set.
  • a random access command is received within a predetermined duration, and the terminal may initiate a random access according to the reference cell indicated by the random access command, or initiate a random access procedure on the cell that carries the random access command; if the random access is exceeded
  • the timer has not been received for a set period of time.
  • the access command the terminal may use the secondary cell as a reference cell, and initiate a random access procedure on the secondary cell. That is, the random access timer waits for the time set by the random access timer. If the random access command is received within the set time, the random access procedure is initiated according to the random access command. Otherwise, If the random access command is not received within the set time, the random access is initiated after waiting for the set timeout.
  • the secondary TA may be the TA received by the terminal during the random access procedure.
  • the base station may send a message 2 (message 2) of the random access procedure to the terminal during the random access procedure, that is, a response message of the random access procedure, and carry the TA in the message 2.
  • message 2 messages 2
  • the base station can also carry the TA in other messages sent to the terminal in the random access process.
  • the terminal may also use the primary cell as a reference cell to initiate a random access procedure on the secondary cell.
  • the secondary TA acquired by the terminal may not be sent in the random access process.
  • the secondary TA obtained by the terminal may be the difference between the timing value of the secondary cell downlink carrier and the timing value of the primary cell downlink carrier, and the secondary TA transmitted by the base station is the sum of the TA acquisition assistance TAs received in the random access procedure.
  • the secondary TA acquired by the terminal may be a difference between the TA received in the random access procedure and the primary cell TA.
  • the base station may also carry the TA carried in the message 2 of the random access procedure sent to the terminal in the random access procedure, or carry the TA in other messages sent to the terminal in the random access procedure.
  • the terminal may also use the secondary cell as the reference cell to initiate a random access procedure on the primary cell.
  • the secondary TA obtained by the terminal may complement the difference between the timing value of the downlink carrier of the cell and the timing value of the downlink carrier of the primary cell, and the sum of the TAs sent by the base station in the random access procedure; or the secondary TA acquired by the terminal. It may be the difference between the TA received in the random access procedure and the primary cell TA.
  • the terminal may not arbitrarily initiate a random access procedure, and the terminal may receive the activated secondary cell command, or After the cell is activated, a random access procedure is initiated to obtain Auxiliary timing advance, which avoids unnecessary signaling overhead and waste of system resources in the random access procedure and the TA maintenance process when the secondary cell is in the deactivated state, thereby saving signaling overhead and system resources.
  • FIG. 2 is a flow chart of another embodiment of a method for acquiring an auxiliary timing advance according to the present invention. As shown in FIG. 2, the method includes:
  • the terminal may obtain the secondary TA.
  • the execution body of the above steps may be a base station.
  • the base station sends a secondary cell activation command to the terminal, after the terminal receives the auxiliary cell activation command, or after the secondary cell is activated, if the secondary TAT of the secondary cell is not running, the terminal may initiate a random The access procedure is to acquire the secondary TA of the secondary cell.
  • the terminal may use the secondary cell with the PRACH resource as the reference cell, and initiate a random access procedure on the secondary cell, where the secondary TA acquired by the terminal may be the TA sent by the base station to the terminal during the random access procedure. .
  • the terminal may also use the primary cell as a reference cell to initiate a random access procedure on the secondary cell.
  • the terminal may also use the secondary cell as the reference cell to initiate a random access procedure on the primary cell.
  • the process of the terminal initiating random access may refer to the method in the embodiment shown in FIG. 1.
  • FIG. 3 is a flowchart of still another embodiment of a method for acquiring an auxiliary timing advance according to the present invention.
  • the secondary cell is used as a reference cell, and the terminal initiates a random access procedure on the secondary cell to obtain the secondary TA of the secondary cell.
  • the terminal initiates a random access procedure on the secondary cell to obtain the secondary TA of the secondary cell.
  • at least one secondary cell needs to have PRACH resources, so that the terminal can initiate a random access procedure on the secondary cell with the PRACH resource.
  • the base station configures multiple secondary cells for the terminal.
  • two secondary cells SCelM and SCell2, respectively, indicate that SCelll belongs to the same TA group as the primary cell, that is, TAG1; SCell2 belongs to another TA group, that is, TAG2. Because SCell2 does not use the primary TA, the terminal needs to obtain the secondary TA corresponding to SCell2, that is, TA2.
  • the base station can indicate that there is a PRACH resource on SCell2.
  • S302 The terminal receives the secondary cell activation command sent by the base station.
  • the base station can carry the secondary cell activation command in the Activation/Deactivation MAC Control Element.
  • the secondary cell activation command can be used to simultaneously activate the secondary cells SCelll and SCell2.
  • the terminal uses SCell2 as a reference cell, and initiates a random access procedure on the PRACH of SCell2.
  • the terminal may initiate a random access procedure to obtain the secondary TA of the SCell, that is, TA2.
  • the terminal uses the SCell2 as the reference cell, that is, the terminal uses the downlink carrier of the SCell2 as the reference.
  • the start sending time of the preamble is the corresponding downlink subframe of the SCell2.
  • the start reception time, n may be a non-negative integer identifying the subframe or a symbol or character for identifying the subframe, and the like.
  • S304 The terminal acquires the auxiliary TA according to the message in the random access process.
  • the terminal receives the message 2 of the random access procedure sent by the base station, and the message 2 of the random access procedure carries the TA, and the TA2 acquired by the terminal may be the TA carried in the message 2, so that the terminal can start Move TAT2.
  • the secondary TA acquisition process of the secondary cell SCell2 that does not use the primary TA is provided. If the base station further configures other secondary cells belonging to the same TA group as the SCell2, the TA acquisition process of other secondary cells adopts the present procedure. The method provided in the examples can be used. If the base station further configures the terminal with other secondary cells that do not belong to the same TA group as the SCell2, the terminal also needs to initiate random on the secondary cell with the PRACH resource if the corresponding secondary TAT is not running after the other secondary cells are activated. The access process is to obtain the auxiliary TA corresponding to other auxiliary cells.
  • the terminal when the terminal actively initiates the random access procedure, the PRACH resource needs to be competed with other terminals, so the random access procedure may fail. If the terminal fails to initiate the random access procedure, the terminal may continue to use SCell2 as the reference cell to initiate a random access procedure on the PRACH of SCell2 until the random access succeeds or the number of random access attempts exceeds the maximum value.
  • FIG. 4 is a flowchart of still another embodiment of a method for acquiring an auxiliary timing advance according to the present invention.
  • the auxiliary device is activated.
  • the secondary TAT of the cell is not running, and the terminal does not immediately initiate random access. Instead, the terminal receives the random access command sent by the base station, and the terminal can use the cell that carries the random access command as the reference cell, and initiates on the reference cell.
  • a random access procedure is used to acquire the secondary TA of the secondary cell.
  • the secondary cell carrying the random access command has a PRACH resource, so that the terminal can initiate a random access procedure on the secondary cell.
  • the base station configures a secondary cell for the terminal.
  • the base station may configure the secondary cell SCelM for the terminal, and indicate that the SCelll and the primary cell PCell do not belong to the same TA group, and the SCelh belongs to another TA group, that is, TAG2.
  • the base station indicates that there is a PRACH resource on the SCelll.
  • S402 The terminal receives the secondary cell activation command sent by the base station.
  • This command is used to activate the secondary cell SCelll.
  • the terminal receives a random access command on the SCelM.
  • the random access command received by the terminal may be, for example, a Physical Downlink Control Channel Order (PDCCH order).
  • PDCCH order Physical Downlink Control Channel Order
  • the base station Since the base station indicates that there is a PRACH resource on the SCelll, the base station can use the random access command to trigger the terminal to initiate a random access procedure in the SCelM.
  • the terminal uses the SCelll as a reference cell to initiate a random access procedure on the SCelM.
  • S405 The terminal acquires the auxiliary TA according to the message in the random access process.
  • the terminal receives the message 2 of the random access procedure sent by the base station, and the message 2 of the random access procedure carries the TA, and the auxiliary TA of the Scell obtained by the terminal is the TA carried in the message 2, so that the terminal can start the corresponding SCell.
  • Auxiliary TAT is
  • FIG. 5 is a flowchart of still another embodiment of a method for acquiring an auxiliary timing advance according to the present invention.
  • the terminal After receiving a secondary cell activation command, or after activating a secondary cell, If the secondary TAT of the secondary cell is not running, the terminal starts a random access timer. If the terminal receives the random access command sent by the base station to acquire the TA of the secondary cell before the random access timer expires, the terminal stops the timer, and the command is carried according to the random access command sent by the base station.
  • the secondary cell or the random access command indicates that the random access is initiated on the cell; if the terminal does not receive the random access command sent by the base station before the random access timer expires, the terminal may use the secondary cell as the reference cell.
  • the random access procedure is initiated to obtain the corresponding TA, but the premise is that the secondary cell that initiates the random access procedure needs to have the PRACH resource.
  • the base station configures a secondary cell for the terminal.
  • the base station may configure the secondary cell SCelM for the terminal, and indicate that the SCelll and the primary cell PCell do not belong to the same TA group, and the SCelh belongs to another TA group, that is, TAG2.
  • the base station indicates that there is a PRACH resource on the SCelll.
  • the terminal After receiving the auxiliary cell activation command sent by the base station, or after the auxiliary cell is activated, the terminal starts a random access timer.
  • the secondary cell activation command is used to activate the secondary cell SCel11.
  • the terminal does not receive the base station sent on the SCelM before the random access timer expires.
  • the random access command is sent, and the terminal uses SCelll as the reference cell to initiate a random access procedure on the SCelM.
  • the terminal receives the message of the random access procedure sent by the base station, and acquires the auxiliary TA.
  • the terminal receives the message 2 of the random access procedure sent by the base station, and the message 2 of the random access procedure carries the TA, and the secondary TA of the Scell obtained by the terminal may be the TA carried in the message 2, so that the terminal can start the assistance corresponding to the Seel I. TAT.
  • the terminal may use the random The cell indicated in the access command is a reference cell, and a random access procedure is initiated on a secondary cell of the secondary TA that needs to be acquired to acquire the TA, provided that the secondary cell that initiates the random access procedure has a PRACH resource. If the reference cell is not explicitly indicated in the random access command, the terminal may use the cell that carries the random access command as a reference cell, and initiate a random access procedure on the reference cell to obtain the secondary TA.
  • FIG. 6 is a flowchart of still another embodiment of a method for acquiring an auxiliary timing advance according to the present invention.
  • the terminal may use the secondary cell as a reference cell, and initiate a random access procedure on the primary cell to acquire the TA.
  • the auxiliary TA TA_msg2 + delta, or 2 * TA_msg2 - TA_pcell.
  • delta is the difference between the timing value of the downlink carrier of the secondary cell and the timing value of the downlink carrier of the primary cell
  • TA_pcell is the TA of the primary cell
  • the base station configures a secondary cell for the terminal.
  • the base station configures the secondary cell SCelM for the terminal, and indicates that the SCelll and the primary cell PCell do not belong to the same TA group, and the SCelll belongs to another TA group, that is, TAG2.
  • the terminal receives the secondary cell activation command sent by the base station.
  • the secondary cell activation command can be used to activate the secondary cell SCell 1. 5603.
  • the terminal uses the SCelM as a reference cell, and initiates a random access procedure on the primary cell PCell. After receiving the secondary cell activation command sent by the base station, or after activating the SCelM, if the terminal finds that the auxiliary TAT of the SCelh is not running, the terminal may initiate a random access procedure to acquire the secondary TA of the Scell.
  • the terminal uses the ScelM as the reference cell, that is, the terminal uses the downlink carrier of the SCelll as a reference.
  • the start transmission time of the preamble is the start reception time of the downlink subframe n corresponding to the SCelll.
  • n may be a non-negative integer identifying the subframe or a symbol or character used to identify the subframe, and the like.
  • the terminal receives the message of the random access procedure sent by the base station, and acquires the auxiliary TA.
  • FIG. 7 is a schematic diagram of obtaining an auxiliary TA in the embodiment provided in FIG. 6, and FIG. 7 is a calculation method of TA2.
  • Msg1 is a message 1 (message 1) in a random access procedure, which may include a preamble, and the eNB is an evolved NodeB.
  • TA_msg2 is the TA carried by message 2 of the random access procedure
  • delta is the difference between the timing value of the downlink carrier of the secondary cell and the downlink carrier of the primary cell Value
  • TA—pcell is the TA of the primary cell.
  • FIG. 8 is a flowchart of still another embodiment of a method for acquiring an auxiliary timing advance according to the present invention.
  • the terminal may use the primary cell as a reference cell, and initiate a random access procedure on the secondary cell to acquire the TA.
  • the auxiliary TA TA_msg2 + delta or 2 * TA_msg2 - TA_ pcell.
  • delta is the difference between the timing value of the downlink carrier of the secondary cell and the timing value of the downlink carrier of the primary cell
  • TA_pcell is the TA of the primary cell.
  • the base station configures a secondary cell for the terminal.
  • the base station may configure the secondary cell SCelM for the terminal, and indicate SCelll It does not belong to the same TA group as the primary cell PCell, and SCelh belongs to another TA group, that is, TAG2.
  • the terminal receives a secondary cell activation command sent by the base station.
  • This command is used to activate the secondary cell SCelll.
  • the terminal uses the primary cell PCell as a reference cell, and initiates a random access procedure on the SCell 1. After receiving the secondary cell activation command sent by the base station, or after activating the SCelM, if the terminal finds that the secondary TAT of the SCelh is not running, the terminal may initiate a random access procedure to obtain the secondary TA of the Scell.
  • the terminal uses the PCell as the reference cell, that is, the terminal uses the downlink carrier of the PCell as the reference.
  • the start sending time of the preamble is the downlink subframe of the PCell.
  • the start reception time of n, n may be a non-negative integer identifying the subframe or a symbol or character for identifying the subframe, and the like.
  • the terminal receives the message of the random access procedure sent by the base station, and acquires the auxiliary TA.
  • the terminal receives the message of the random access procedure sent by the base station, and acquires the auxiliary TA2 of the ScelM according to the TA carried in the message 2 of the random access procedure, so that the auxiliary TAT of the Scell can be started.
  • FIG. 9 is a schematic diagram of obtaining an auxiliary TA in the embodiment provided in FIG. 8, and the calculation method of TA2 is as shown in FIG. 9:
  • Msg1 is a message 1 in a random access procedure, which may include a preamble, and the eNB is an evolved base station (evolved NodeB).
  • eNB is an evolved base station (evolved NodeB).
  • TA_msg2 is the TA indicated by the message 2 of the random access procedure
  • delta is the difference between the timing values of the downlink carrier of the secondary cell and the downlink carrier of the primary cell
  • TA_pcell is the TA of the primary cell.
  • the terminal will refresh all the buffers of the Hybrid Automatic Repeat Request (HQQ) and clear the resources of the uplink and downlink semi-persistent scheduling, and notify the radio resource control.
  • the Radio Resource Control (RRC) layer releases the Physical Uplink Control Channel (PUCCH) and/or the Sounding Reference Signal (Sounding Reference) Signal; SRS) Resources.
  • PUCCH Physical Uplink Control Channel
  • SRS Sounding Reference Signal
  • FIG. 10 is a flowchart of an uplink out-of-synchronization processing method provided by the present invention. As shown in FIG. 10, the method specifically includes:
  • the terminal initiates the auxiliary TAT of the configured secondary cell.
  • the terminal If the secondary TAT of the secondary cell times out, the terminal notifies the base station, and/or stops uplink transmission on the secondary cell, and/or activates the secondary cell.
  • the terminal may acquire the auxiliary TA of the secondary cell according to the method provided in the foregoing method for acquiring the timing advance amount, thereby starting the secondary TAT of the secondary cell.
  • the base station configures the secondary cells SCelll and SCell2 for the terminal, and activates SCelll and SCell2.
  • the base station indicates in the configuration message that SCelll and SCell2 belong to the same TAG2, and the terminal starts the auxiliary TAT of SCelH and SCell2, that is, TAT2. If TAT2 times out, the terminal notifies the base station, and/or stops all upstream transmissions on SCelll and SCell2, and/or deactivates SCelll and SCell2.
  • the terminal may synchronize in the primary cell or other uplink through RRC signaling (which may be newly defined RRC signaling) or Media Access Control Component Element (MAC CE) or Physical Layer (PHY) signaling.
  • the secondary cell informs the base station that the uplink is out of synchronization due to the TAT2 timeout.
  • the terminal may also stop all uplink transmissions, and specifically may stop transmission including the physical uplink shared channel PUSCH, the physical uplink control channel PUCCH, and the Sounding reference signal SRS. Thereby avoiding waste of resources and possible upstream conflicts.
  • the method can be used in conjunction with the method for acquiring the auxiliary timing advance provided by the embodiment of the present invention to save signaling overhead and system resources, and avoid resource waste and Upward conflicts that can occur.
  • the computer readable storage medium which when executed, may include the flow of an embodiment of the methods as described above.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • FIG. 1 is a schematic structural diagram of an embodiment of a terminal provided by the present invention.
  • the terminal of the present invention includes: a receiving unit 11, a random access unit 12, and an obtaining unit 13;
  • the receiving unit 1 1 is configured to receive a secondary cell activation command, where the secondary timing advance TA of the secondary cell is different from the primary TA of the primary cell;
  • the random access unit 12 is configured to: after the receiving unit 1 1 receives the secondary cell random access command, or after the secondary cell is activated, if the auxiliary time alignment timer TAT of the secondary cell is not running, initiate Random access procedure;
  • the obtaining unit 13 is configured to acquire the auxiliary according to the TA received in the random access process.
  • the random access unit 12 may initiate a random access procedure to obtain the auxiliary. Auxiliary TA of the cell.
  • the random access unit 12 may initiate random access or random access immediately after the receiving unit 11 receives the secondary cell activation command sent by the base station, or after the secondary cell is activated, if the secondary TAT of the secondary cell is not running.
  • the unit 12 may not initiate a random access, but initiate a random access under the trigger of the receiving station. For example, after the terminal receives the random access command, the random access procedure may be initiated according to the random access command.
  • the random access unit 12 may further determine the random access according to the duration set by a set random access timer, if the terminal is set in the random access timer. A random access command is received, and the random access unit 12 may initiate random access according to the reference cell indicated by the random access command, or initiate random access on the cell that carries the random access command; The random access unit 12 may use the secondary cell as a reference cell to initiate random access on the secondary cell.
  • the ingress unit 12 may refer to a secondary cell having a PRACH resource as a reference cell, and initiate a random access procedure on the secondary cell.
  • the random access procedure initiated by the random access unit 12 may be initiated actively, or may be initiated by the base station, and the receiving unit 11 may also receive a random access command sent by the base station, for example, random access.
  • the unit 12 initiates a random access procedure according to the received random access command sent by the base station.
  • the random access unit 12 may initiate a random access procedure on the secondary cell with the PRACH resource according to the indicated reference cell; or may use the cell carrying the random access command as the reference cell, on the cell carrying the random access command. Initiate a random access procedure.
  • the terminal may include a random access timer.
  • the random access unit 12 may still use the secondary cell as a reference cell. A random access procedure is initiated on the secondary cell.
  • the secondary TA obtained by the obtaining unit 13 may be the TA received during the random access procedure.
  • the random access unit 12 may also use the primary cell as a reference cell to initiate a random access procedure on the secondary cell.
  • the secondary TA acquired by the obtaining unit 13 may not be sent by the base station in the random access process.
  • the secondary TA obtained by the terminal may be the difference between the timing value of the secondary cell downlink carrier and the timing value of the primary cell downlink carrier, and the secondary TA transmitted by the base station is the sum of the TA acquisition assistance TAs received in the random access procedure.
  • the secondary TA acquired by the obtaining unit 13 may be a difference between the TA received in the random access procedure and the primary cell TA.
  • the random access unit 12 may also Taking the secondary cell as a reference cell, a random access procedure is initiated on the primary cell.
  • the secondary TA acquired by the obtaining unit 13 may be used to complement the difference between the timing value of the downlink carrier of the cell and the timing value of the downlink carrier of the primary cell, and the sum of the TAs sent by the base station in the random access procedure; or the acquiring unit 13
  • the obtained secondary TA may be a difference between the TA received in the random access procedure and the primary cell TA.
  • the terminal after receiving the activated supplementary cell command sent by the base station, or after the secondary cell is activated, the terminal initiates a random access procedure to obtain an auxiliary timing advance, thereby saving signaling overhead and system resources.
  • Figure 12 is a schematic structural diagram of another embodiment of the terminal provided by the present invention.
  • the terminal of the present invention includes: a receiving unit 1 1 , a random access unit 12 and an obtaining unit 13;
  • the random access unit 12 is specifically configured to: use the secondary cell as a reference cell, and initiate a random access procedure on the secondary cell.
  • the receiving unit 1 1 can also be configured to: receive a random access command sent by the base station.
  • the random access unit 12 may be configured to: initiate a random access procedure on the secondary cell according to the reference cell indicated in the random access command.
  • the random access unit 12 may be further configured to: use a cell that carries a random access command as a reference cell, and initiate a random access procedure on a cell that carries a random access command.
  • the terminal provided by this embodiment may further include: a random access timer 14, configured to start after the receiving unit receives the auxiliary cell activation command sent by the 1 base station or after the auxiliary cell is activated; the random access unit 12 is specifically used to: If the random access command sent by the base station is not received after the set duration of the random access timer 14, the secondary cell is used as the reference cell, and the random access procedure is initiated on the secondary cell.
  • a random access timer 14 configured to start after the receiving unit receives the auxiliary cell activation command sent by the 1 base station or after the auxiliary cell is activated
  • the random access unit 12 is specifically used to: If the random access command sent by the base station is not received after the set duration of the random access timer 14, the secondary cell is used as the reference cell, and the random access procedure is initiated on the secondary cell.
  • the auxiliary TA acquired by the obtaining unit 13 is the TA received in the random access procedure.
  • the random access unit 12 can also be used to: use the primary cell as a reference cell and send the secondary cell The random access procedure is initiated; or, the secondary cell is used as a reference cell, and a random access procedure is initiated on the primary cell.
  • the auxiliary TA obtained by the obtaining unit 13 is the sum of the difference between the receiving TA and the timing value of the downlink carrier of the secondary cell and the downlink carrier of the primary cell in the random access procedure; or the random access The difference between the TA received in the process and the primary cell TA.
  • the random access unit 12 is further configured to: use the downlink carrier of the reference cell as a reference when transmitting the preamble in the process of initiating the random access.
  • the terminal provided by the embodiment of the present invention may further include: a starting unit 15;
  • the initiating unit 15 is configured to start the auxiliary TAT processing unit 16 according to the auxiliary TA acquired by the obtaining unit 13, to notify the base station to assist the TAT timeout if the auxiliary TAT times out, and/or to stop the uplink transmission in the secondary cell corresponding to the auxiliary TAT, And/or deactivate the secondary cell corresponding to the secondary TAT.
  • the embodiment of the present invention may further provide a terminal, which may include the activation unit 15 and the processing unit 16 shown in FIG.
  • the terminal can obtain the auxiliary TA of the secondary cell by using the method for acquiring the TA provided in the embodiment of the present invention.
  • a random access timer 14 may be set. If the receiving unit 11 does not receive the random access command sent by the base station after exceeding the set duration of the random access timer 14, the random access command is random.
  • the access unit 12 may still reference the secondary cell as a reference cell, and initiate a random access procedure on the secondary cell or on other secondary cells sharing the same secondary TA and having PRACH resources.
  • the TA sent by the base station received by the obtaining unit 13 during the random access procedure is the auxiliary TA.
  • the terminal provided by the embodiment of the present invention is an execution device of the method for acquiring the auxiliary timing advance amount according to the embodiment of the present invention, which corresponds to the method for acquiring the auxiliary timing advance amount provided by the embodiment of the present invention, and the auxiliary timing advance amount is executed.
  • the auxiliary timing advance amount is executed.
  • the terminal provided by the embodiment of the present invention receives the activation auxiliary cell command sent by the base station or After the secondary cell is activated, a random access procedure is initiated to obtain an auxiliary timing advance, thereby saving signaling overhead and system resources.
  • FIG. 13 is a schematic structural diagram of an embodiment of a base station according to the present invention.
  • the base station includes: a first sending unit 21 and a second sending unit 22;
  • the first sending unit 21 is configured to send a secondary cell activation command to the terminal.
  • a second sending unit 22 configured to send, according to the random access initiated by the terminal, a TA to the terminal in the random access procedure; the random access is activated by the terminal after receiving the auxiliary cell After the command, or after confirming that the secondary cell is activated according to the secondary cell activation command, if the secondary TAT of the secondary cell is not activated, the secondary TA of the secondary cell is different from the primary TA of the primary cell.
  • the terminal can obtain the auxiliary TA.
  • the first sending unit 21 may be further configured to: before the terminal initiates the random access procedure, send a random access command to the terminal, so that the terminal uses the cell that carries the random access command as a reference cell, Initiating a random access procedure on the cell that carries the random access command; if the reference cell is indicated in the random access command, so that the terminal is based on the reference cell indicated in the random access command, A random access procedure is initiated on the secondary cell.
  • the TA is sent to the terminal as the auxiliary TA in the random access process.
  • the first sending unit 21 may be further configured to: before the terminal initiates a random access procedure, send a random access command to the terminal, so that the terminal uses the primary cell as a reference cell, in the secondary cell
  • the random access procedure is initiated on the primary cell, or the terminal is used as the reference cell, and the random access procedure is initiated on the primary cell.
  • the terminal may be the terminal in the embodiment shown in FIG. 11 and FIG.
  • the base station provided by the embodiment of the present invention is an execution device for acquiring the auxiliary timing advance amount provided by the embodiment of the present invention, and the method for obtaining the auxiliary timing advance amount provided by the embodiment of the present invention
  • the method for obtaining the auxiliary timing advance amount provided by the embodiment of the present invention
  • the base station provided by the embodiment of the present invention initiates a random access procedure to obtain an auxiliary timing advance after receiving an activated secondary cell command or a secondary cell activation sent by the base station, thereby saving signaling overhead and system resources.

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Description

辅助定时提前量的获取方法和设备 本申请要求 2011年 4月 2日的提交的， 申请号为 201110084167.7, 发 明名称为 《辅助定时提前量的获取方法和设备》 的中国申请的优先权， 其 全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域， 特别涉及一种辅助定时提前量的获取方法 和设备。 背景技术
长期演进系统（Long Term Evolution; LTE )是第三代合作伙伴计划 ( The 3rd Generation Partnership Project; 3GPP )正在发展制定的下一 代无线通信标准， 具有^艮高的频谱利用率和传输速度， 较低的传输时延等 优点。 LTE系统的终端通过定时提前量（Timing Advance; TA )来实现上 行传输与基站的同步， 通过时间对齐定时器（Time Alignment Timer; TAT ) 来维持上行同步。 TA的引入使所有终端的上行传输能够在基站预期的时刻 达到， 从而避免终端间的上行传输沖突， 实现时分复用。
为了提供更高的数据速率， 基站还可以为终端配置一个或多个辅助小 区 ( Secondary Cell; SCell )辅助主小区 ( Primary Cell; PCell )进行数 据传输， 主小区和每个辅助小区分别对应一个上行载波， 其中， 在不同上 行载波的传输可能需要使用不同的 TA。 主小区对应的 TA称为主 TA, 主小区 对应的 TAT称为主 TAT, 辅助小区的 TA称为辅助 TA, 辅助小区的 TAT称为辅 助 TAT。
现有技术中， 在配置了辅助小区后， 如果辅助小区不沿用主小区已有 的 TA, 终端在辅助小区发起随机接入来获取该辅助小区的辅助 TA, 这样 可能会增加随机接入过程和 TA维持过程中的信令开销， 浪费系统资源。 发明内容 本发明实施例提供了一种辅助定时提前量的获取方法和设备， 可以在 获取辅助 TA时减少信令开销和节省系统资源。
本发明实施例提供一种辅助定时提前量的获取方法， 包括：
终端在接收辅助小区激活命令后， 或者， 在所述辅助小区激活后， 若 所述辅助小区的辅助时间对齐定时器 TAT没有运行， 发起随机接入过程； 所述终端根据所述随机接入过程中接收的 TA获取所述辅助小区的辅 助定时提前量 TA。
本发明实施例还提供另一种辅助定时提前量的获取方法， 包括： 向终端发送辅助小区激活命令； 根据所述终端发起的随机接入， 在随 机接入过程中向终端发送 TA; 所述随机接入由所述终端在接收到所述辅助 小区激活命令后， 或者根据所述辅助小区激活命令确认所述辅助小区激活 后， 若所述辅助小区的辅助 TAT没有运行后发起的。
本发明实施例还提供了一种上行失步处理方法， 包括： 终端启动配置 的辅助小区的辅助 TAT; 若所述辅助小区的 TAT超时， 所述终端通知基站， 和 /或停止所述辅助小区上的上行传输， 和 /或激活所述辅助小区。
本发明实施例还提供一种终端， 包括：
接收单元， 用于接收辅助小区激活命令；
随机接入单元， 用于所述接收单元接收所述辅助小区随机接入命令后 或者在所述辅助小区激活后， 若所述辅助小区的辅助时间对齐定时器 TAT 没有运行， 发起随机接入过程；
获取单元，用于根据所述随机接入过程中接收的 TA获取所述辅助小区 的辅助定时提前量 TA。 本发明实施例还提供一种基站， 包括：
第一发送单元， 用于向终端发送辅助小区激活命令。
第二发送单元， 用于根据所述终端发起的随机接入， 在所述随机接入 过程中向所述终端发送 TA; 所述随机接入由所述终端在接收到所述辅助小 区激活命令后， 或者根据所述辅助小区激活命令确认所述辅助小区激活后， 若所述辅助小区的辅助 TAT没有运行后发起的。
本发明实施例还提供一种终端， 包括： 启动单元， 用于根据获取的辅 助 TA启动辅助 TAT; 处理单元， 用于若辅助 TAT超时， 通知基站辅助 TAT 超时， 和 /或停止在所述辅助 TAT对应的辅助小区进行上行传输，和 /或去激 活所述辅助 TAT对应的辅助小区。
本发明实施例提供的辅助定时提前量的获取方法和设备， 终端在接收 到激活辅助小区命令后， 或者在辅助小区激活后， 发起随机接入过程以获 取辅助定时提前量， 从而节约信令开销和系统资源。 附图说明 实施例或现有技术描述中所需要使用的附图作一筒单地介绍， 显而易见地， 下面描述中的附图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性的前提下， 还可以根据这些附图获得其他的附图。
图 1 为本发明提供的辅助定时提前量的获取方法的一种实施例的流程 图；
图 2为本发明提供的辅助定时提前量的获取方法的另一种实施例的流 程图；
图 3为本发明提供的辅助定时提前量的获取方法的又一种实施例的流 程图；
图 4为本发明提供的辅助定时提前量的获取方法的再一种实施例的流 程图；
图 5为本发明提供的辅助定时提前量的获取方法的再一种实施例的流 程图；
图 6为本发明提供的辅助定时提前量的获取方法的又一种实施例的流 程图；
图 7为图 6提供的实施例中获取辅助 TA的示意图； 图 8为本发明提供的辅助定时提前量的获取方法的又一实施例的流程 图
图 9为图 8提供的实施例中获取辅助 TA的示意图；
图 10为本发明实施例中提供的上行失步处理方法的流程图；
图 11本发明提供的终端的一个实施例的结构示意图；
图 12本发明提供的终端的另一个实施例的结构示意图；
图 13本发明提供的基站的一个实施例的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 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作出创造性劳动前提 下所获得的所有其他实施例， 都属于本发明保护的范围。
在本发明实施例中， 基站可以为演进基站 （evolved Node B; eNB ), 基站台 （ Base Station; BS ), Node B, 接入点 （ access point )等。 基站 可以是宏基站， 也可以是中型基站， 或微型基站， 例如家庭基站等。 每个 基站可以为特定地理区域提供通信覆盖。 术语 "小区 （cell )" 可以为基站 的覆盖区域， 和 /或基站子系统服务的覆盖区域， 取决于该术语所使用的上 下文。基站可以为宏小区、皮小区（ pico cell )、毫微微蜂窝小区（ femto cell ), 和 /或其它类型的小区提供通信覆盖。
在本发明实施例中， 终端可以分布于整个无线网络中， 每个终端可以 是静态的或移动的。 终端 （terminal )可以为用户设备 ( user equipment; UE ), 移动台 ( mobile station; MS ), 用户单元（subscriber unit ), 站台 ( station ) 等。 终端还可以为蜂窝电话（ cellular phone ), 个人数字助理 ( personal digital assistant; PDA ), 无线调制解调器（ modem ), 无线通 信设备， 手持设备（ handheld ), 膝上型电脑（ laptop computer ), 无绳电 话（ cordless phone ), 无线本地环路（ wireless local loop, WLL ) 台等。 终端可以与宏基站、 pico基站， femto基站等基站进行通信。 终端还可以包 括与基站进行通信、 具有类似终端角色的通信设备， 例如， 中继站 （relay node, RN )在初始接入网络时， RN 和基站在进行通信时， 作为一个终端 接入网络。
图 1 为本发明提供的辅助定时提前量的获取方法的一种实施例的流程 图， 如图 1所示， 该方法包括：
5101、 终端在接收辅助小区激活命令后， 或在所述辅助小区激活后， 若所述辅助小区的辅助 TAT没有运行，发起随机接入过程，所述辅助小区的 辅助 TA与主小区的主 TA不同；
5102、 所述终端根据所述随机接入过程中接收的 TA获取所述辅助 TA。 基站可以在向终端发送的随机接入过程的消息 2中携带 TA。 终端获取
TA后可以启动 TAT。 在 TAT运行期间， 终端处于上行同步状态。 在本发明 实施例中， 还可以包括， 基站通过发送媒体访问控制 （Medium Access Control; MAC )层定时提前量命令 ( Timing Advance Command )来对 TA 进行校准， 以使终端的上行传输和基站同步。 终端根据从 TA command接 收到的 TA校准值后重启 TAT, 以始终保持上行传输与基站同步。
在本发明实施例中， 终端接收到所述辅助小区激活命令， 所述辅助小 区可能已经激活， 或者也可能没有激活， 终端可以在接收到辅助小区激活 命令后，无论辅助小区是否已经激活，若所述辅助小区的辅助 TAT没有运行， 即可以发起随机接入过程。 或者， 终端在接收到辅助小区激活命令后， 可 以等确认所述辅助小区激活后，若所述辅助小区的辅助 TAT没有运行，再发 起随机接入过程。
本实施例中， 辅助小区的辅助 TA与主小区的主 TA可以不同， 即不属于 同一 TA组（TA Gmup; TAG ) 。 当有多个辅助小区时， 这些多个辅助小区 的辅助 TA与主小区的主 TA可以不同，并且，这些辅助小区的辅助 TA可以相 同。 例如， 如果辅助 TA与主小区的主 TA不同的辅助小区具有物理随机接入 信道 ( Physical Random Access Channel; PRACH )资源， 终端可以^1该 具有 PRACH资源的辅助小区作为参考小区， 在该辅助小区上发起随机接入 过程。 当有辅助 TA与主小区的主 TA不同的多个辅助小区时， 且多个辅助小 区的辅助 TA相同时， 若多个辅助小区中至少有一个辅助小区具有 PRACH 资源， 终端可以以具有 PRACH资源的辅助小区为参考小区， 在该辅助小区 上发起随机接入过程。 其中， 参考小区的作用是， 终端在发起随机接入的 过程中， 终端发送前导码（preamble ) 时以参考小区的下行载波为参考。
本发明提供的实施例中， 当终端接收到辅助小区激活命令后， 或者在 辅助小区激活后，如果辅助小区的辅助 TAT没有运行，终端可以发起随机接 入过程以获取该辅助小区的辅助 TA。 终端可以是在接收到辅助小区激活命 令后， 或者在辅助小区激活后， 如果辅助小区的辅助 TAT没有运行， 终端可 以立即主动发起随机接入， 或者， 终端可以不主动发起随机接入， 而是可 以在基站的触发下发起的， 例如， 可以是在接收到辅助小区激活命令后， 或者在辅助小区激活后，辅助小区的辅助 TAT没有运行， 当终端收到随机接 入命令后， 根据随机接入命令发起随机接入过程。 如果基站发送的随机接 入命令中指示了参考小区， 终端可以根据该指示的参考小区 （即， 终端在 发起随机接入的过程中， 终端发送前导码时以基站指示的参考小区的下行 载波为参考） ， 在具有 PRACH资源的辅助小区上发起随机接入过程； 如果 随机接入命令中没有指示参考小区， 终端可以以承载随机接入命令的小区 为参考小区， 在承载随机接入命令的小区上发起随机接入过程。 在本发明 实施例中， 终端还可以设置一个随机接入定时器， 在接收到辅助小区激活 命令后， 或者在辅助小区激活后， 辅助小区的辅助 TAT没有运行， 如果在随 机接入定时器设定的时长内收到了随机接入命令， 终端可以根据随机接入 命令指示的参考小区发起随机接入， 或者在承载该随机接入命令的小区上 发起随机接入过程； 如果在超过随机接入定时器的设定时长仍未收到随机 接入命令， 终端可以以辅助小区为参考小区， 在该辅助小区上发起随机接 入过程。 即通过随机接入定时器， 先等待随机接入定时器设定的时间， 在 该设定的时间内， 如果收到随机接入命令， 则根据随机接入命令发起随机 接入过程， 否则， 如果在设定的时间内没有收到随机接入命令， 则等待该 设定的时间超时后再发起随机接入。
终端在辅助小区上发起随机接入以获得辅助 TA时， 该辅助 TA可以为终 端在随机接入过程中接收到的 TA。 例如， 基站可以在随机接入过程中向终 端发送的随机接入过程的消息 2 ( message 2 ) , 即随机接入过程的响应消 息， 在该消息 2中携带 TA。 可以理解的是， 在本发明实施例中， 基站还可以 通过随机接入过程中向终端发送的其他消息中携带 TA。
另外， 在本发明实施例中， 终端还可以以主小区为参考小区， 在辅助 小区上发起随机接入过程， 在这种情况下， 终端获取的辅助 TA可以不是在 随机接入过程中发送的 TA, 终端获取的辅助 TA可以是辅助小区下行载波的 定时值与主小区下行载波的定时值的差值， 与基站发送的辅助 TA为随机接 入过程中接收的 TA获取辅助 TA之和。或者，终端获取的辅助 TA可以为随机 接入过程中接收的 TA的 2倍与主小区 TA的差值。 同样， 基站也可以在随机 接入过程中向终端发送的随机接入过程的消息 2中携带的 TA,或者通过随机 接入过程中向终端发送的其他消息中携带 TA。
在本发明实施例中， 当终端的所有辅助小区均不具有 PRACH资源时， 终端还可以以辅助小区为参考小区， 在主小区上发起随机接入过程。 这种 情况下， 终端获取的辅助 TA可以辅助小区下行载波的定时值和主小区下行 载波的定时值的差值， 与基站在随机接入过程中发送的 TA之和； 或者终端 获取的辅助 TA可以为随机接入过程中接收的 TA的 2倍与主小区 TA的差值。
在本实施例提供的辅助定时提前量的获取方法中， 当需要获取辅助小 区的辅助 TA时， 终端可以不任意地发起随机接入过程， 终端可以在接收到 激活辅助小区命令， 或者， 在辅助小区激活后， 发起随机接入过程以获取 辅助定时提前量， 这样可以避免当辅助小区处于去激活状态时的随机接入 过程和 TA维持过程中的不必要的信令开销和系统资源的浪费， 从而节约信 令开销和系统资源。
图 2为本发明提供的辅助定时提前量的获取方法的另一种实施例的流 程图， 如图 2所示， 该方法包括：
5201、 向终端发送辅助小区激活命令。
5202、 根据所述终端发起的随机接入， 在随机接入过程中向终端发送 TA; 所述随机接入由所述终端在接收到所述辅助小区激活命令后， 或者根 据所述辅助小区激活命令确认所述辅助小区激活后， 若所述辅助小区的辅 助 TAT没有运行后发起， 所述辅助小区的辅助 TA与主小区的主 TA不同。
在本实施例中， 通过随机接入过程向终端发送 TA后， 可以以使终端获 取辅助 TA。
以上步骤的执行主体可以为基站。
本发明提供的实施例中， 基站向终端发送辅助小区激活命令， 终端可 以在接收到该辅助小区激活命令后， 或者是辅助小区激活后， 如果辅助小 区的辅助 TAT没有运行，则终端可以发起随机接入过程以获取该辅助小区的 辅助 TA。
在本实施例中， 终端可以将该具有 PRACH资源的辅助小区作为参考小 区， 在该辅助小区上发起随机接入过程， 终端获取的辅助 TA可以为基站在 随机接入过程中发送给终端的 TA。或者， 终端还可以以主小区为参考小区， 在辅助小区上发起随机接入过程。 或者， 当终端的所有辅助小区均不具有 PRACH资源时， 终端还可以以辅助小区为参考小区， 在主小区上发起随机 接入过程。 在本实施例中， 终端发起随机接入的过程可以参考图 1所示实施 例中方法。
图 3为本发明提供的辅助定时提前量的获取方法的又一种实施例的流 程图， 如图 3所示， 接收到辅助小区激活命令后， 或在辅助小区激活后， 如 果该辅助小区的辅助 TAT没有运行，则以该辅助小区为参考小区，终端在该 辅助小区上发起随机接入过程来获取该辅助小区的辅助 TA。需要说明的是， 对于具有相同辅助 TA的多个辅助小区而言， 至少需要其中一个辅助小区具 有 PRACH资源， 以使终端可以在具有 PRACH资源的辅助小区上发起随机 接入过程。
5301、 基站为终端配置多个辅助小区。
在本实施例中， 例如两个辅助小区， 分别为 SCelM和 SCell2, 并指示 SCelll与主小区属于同一个 TA组， 即 TAG1 ; SCell2属于另一个 TA组， 即 TAG2。由于 SCell2不采用主 TA,因此，终端需要获取 SCell2对应的辅助 TA, 即 TA2。 另外， 基站可以指示 SCell2上具有 PRACH资源。
5302、 终端接收到基站发送的辅助小区激活命令。
例 如 ： 基站可 以 在激活 /去激活媒体控制 组成单元 ( Activation/Deactivation MAC Control Element ) 中携带辅助小区激活命 令。
该辅助小区激活命令可以用于同时激活辅助小区 SCelll和 SCell2。
5303、终端以 SCell2为参考小区， 在 SCell2的 PRACH上发起随机接入 过程。
终端在激活 SCell2后， 如果发现 SCell2的辅助 TAT, 即 TAT2没有运行， 则终端可以发起随机接入过程以获取 SCell的辅助 TA, 即 TA2。 其中， 终端 以 SCell2为参考小区， 也即终端以 SCell2的下行载波为参考， 终端在选定 SCell2的上行子帧 n的 PRACH发送前导码时， 前导码的开始发送时刻为 SCell2对应下行子帧 n的开始接收时刻， n可以为标识子帧的非负整数或用 于标识子帧的符号或字符等。
5304、 终端根据随机接入过程中的消息获取辅助 TA。
终端接收基站发送的随机接入过程的消息 2, 该随机接入过程的消息 2 中携带 TA, 终端获取的 TA2即可以为消息 2中携带的 TA, 从而终端可以启 动 TAT2。
在本实施例中， 提供了不采用主 TA的辅助小区 SCell2的辅助 TA获取过 程， 如果基站还为终端配置了与 SCell2属于同一个 TA组其他辅助小区， 则 其他辅助小区的 TA获取过程采用本实施例提供的方法即可。 如果基站还为 终端配置了与 SCell2不属于同一个 TA组其他辅助小区， 则终端同样需要在 其他辅助小区激活后， 对应的辅助 TAT没有运行的情况下， 在具有 PRACH 资源的辅助小区上发起随机接入过程以获取其他辅助小区对应的辅助 TA。
需要说明的是， 由于本实施例中终端主动发起随机接入过程时， 需要 与其他终端竟争 PRACH资源， 因此该随机接入过程可能会失败。 如果终端 发起随机接入过程失败， 则终端可以继续以 SCell2为参考小区， 在 SCell2 的 PRACH上发起随机接入过程， 直至随机接入成功， 或者发起随机接入的 次数超过最大值为止。
图 4为本发明提供的辅助定时提前量的获取方法的再一实施例的流程 图， 如图 4所示， 本实施例中， 在接收到辅助小区激活命令后， 或辅助小区 激活后， 辅助小区的辅助 TAT没有运行， 终端不立即发起随机接入， 而是终 端接收到基站发送的随机接入命令后， 终端可以以承载该随机接入命令的 小区为参考小区， 在该参考小区上发起随机接入过程来获取该辅助小区的 辅助 TA。 需要说明的是， 承载该随机接入命令的辅助小区上具有 PRACH 资源， 以使终端可以在该辅助小区上发起随机接入过程。
5401、 基站为终端配置辅助小区。
在本实施例中， 基站可以为终端配置辅助小区 SCelM , 并指示 SCelll 与主小区 PCell不属于同一个 TA组， SCelh属于另一个 TA组， 即 TAG2。 另 外， 基站指示 SCelll上有 PRACH资源。
5402、 终端接收到基站发送的辅助小区激活命令。
该命令用于激活辅助小区 SCelll。
5403、 终端在 SCelM上接收到随机接入命令。 终端收到的随机接入命令例如可以为物理下行控制信道命令 ( Physical Downlink Control Channel Order; PDCCH order ) 。
由于基站指示 SCelll上有 PRACH资源， 因此， 基站可以采用随机接入 命令触发终端在 SCelM发起随机接入过程。
5404、 终端以 SCelll为参考小区， 在 SCelM上发起随机接入过程。
5405、 终端根据随机接入过程中的消息获取辅助 TA。
终端接收基站发送的随机接入过程的消息 2, 该随机接入过程的消息 2 中携带 TA, 终端获取的 Scell的辅助 TA即为该消息 2中携带的 TA, 从而终端 可以启动该 SCell对应的辅助 TAT。
图 5为本发明提供的辅助定时提前量的获取方法的再一实施例的流程 图， 如图 5所示， 本实施例中， 在接收到辅助小区激活命令后， 或辅助小区 激活后，如果该辅助小区的辅助 TAT没有运行，则终端启动随机接入定时器。 如果在该随机接入定时器超时前， 终端接收到基站发送的用于获取该辅助 小区的 TA的随机接入命令， 则终端停止该定时器， 根据基站发送的随机接 入命令在承载该命令的辅助小区或随机接入命令指示的小区上发起随机接 入； 如果在该随机接入定时器超时前终端未接收到基站发送的随机接入命 令， 则终端可以以该辅助小区为参考小区， 发起随机接入过程来获取对应 TA, 但前提是发起随机接入过程的辅助小区需要具有 PRACH资源。
5501、 基站为终端配置辅助小区。
在本实施例中， 基站可以为终端配置辅助小区 SCelM , 并指示 SCelll 与主小区 PCell不属于同一个 TA组， SCelh属于另一个 TA组， 即 TAG2。 另 外， 基站指示 SCelll上有 PRACH资源。
5502、终端接收到基站发送的辅助小区激活命令，或辅助小区激活后， 终端启动随机接入定时器。
其中， 辅助小区激活命令用于激活辅助小区 SCelll。
5503、 在随机接入定时器超时前， 终端没有在 SCelM上接收到基站发 送的随机接入命令，则终端以 SCelll为参考小区，在 SCelM上发起随机接入 过程。
S504、 终端接收到基站发送的随机接入过程的消息， 获取辅助 TA。 终端接收到基站发送的随机接入过程的消息 2, 随机接入过程的消息 2 中携带 TA, 终端获取的 Scell的辅助 TA可以为消息 2中携带的 TA, 从而终端 可以启动 Seel I对应的辅助 TAT。
需要说明的是， 如果在随机接入定时器超时前， 终端接收到基站针对 TAG2发送的随机接入命令，如果随机接入命令明确指示了参考小区或需要 获取的 TA, 则终端可以以该随机接入命令中指示的小区为参考小区， 在需 要获取的辅助 TA的一个辅助小区上发起随机接入过程以获取 TA, 前提是， 发起随机接入过程的辅助小区上具有 PRACH资源。 如果随机接入命令中没 有明确指示参考小区， 则终端可以以承载该随机接入命令的小区为参考小 区， 在该参考小区上发起随机接入过程以获取辅助 TA。
图 6为本发明提供的辅助定时提前量的获取方法的又一实施例的流程 图， 如图 6所示， 本实施例中， 在接收到辅助小区激活命令后， 或辅助小区 激活后， 该辅助小区上不具有 PRACH资源。 如果该辅助小区的辅助 TAT没 有运行， 则终端可以以该辅助小区为参考小区， 在主小区上发起随机接入 过程来获取 TA。 其中， 辅助 TA = TA_msg2 + delta, 或 2 * TA_msg2 - TA— pcell。 其中， TA— msg2为该随机接入过程的消息 2中携带的 TA, delta 为辅助小区下行载波的定时值和主小区下行载波的定时值之间的差值， TA— pcell为主小区的 TA。
5601、 基站为终端配置辅助小区。
在本实施例中，基站为终端配置辅助小区 SCelM ,并指示 SCelll与主小 区 PCell不属于同一个 TA组， SCelll属于另一个 TA组， 即 TAG2。
5602、 终端接收到基站发送的辅助小区激活命令。
该辅助小区激活命令可以用于激活辅助小区 SCell 1。 5603、终端以 SCelM为参考小区，在主小区 PCell上发起随机接入过程。 终端在接收到基站发送的辅助小区激活命令后， 或者在激活 SCelM后， 如果终端发现 SCelh的辅助 TAT没有运行，则终端可以发起随机接入过程获 取 Scell的辅助 TA。 终端以 ScelM为参考小区， 即终端以 SCelll的下行载波 为参考， 终端在选定 PCell上行子帧 n的 PRACH发送前导码时， 前导码的开 始发送时刻为 SCelll对应下行子帧 n的开始接收时刻， n可以为标识子帧的 非负整数或用于标识子帧的符号或字符等。
5604、 终端接收到基站发送的随机接入过程的消息， 获取辅助 TA。 终端接收到基站发送的随机接入过程的消息 2, 根据该随机接入过程的 消息 2中携带的 TA计算 ScelM的辅助 TA, 从而可以启动 Scell的辅助 TAT。
图 7为图 6提供的实施例中获取辅助 TA的示意图， TA2的计算方法参见 图 7:
图 7中， Msg1为随机接入过程中的消息 1 ( message 1 ) , 其中可以包 含前导码， eNB为演进型基站（ evolved NodeB ) 。
TA2 = TA_msg2 + delta或 TA2 = 2 χ TA_msg2 - TA— pcelL 其中， TA— msg2为随机接入过程的消息 2携带的 TA, delta为辅助小区下行载波和 主小区下行载波的定时值之间的差值， TA— pcell为主小区的 TA。
图 8为本发明提供的辅助定时提前量的获取方法的又一实施例的流程 图， 如图 8所示， 本实施例中， 在接收到辅助小区激活命令后， 或辅助小区 激活后，如果该辅助小区的辅助 TAT没有运行，则终端可以以主小区为参考 小区，在该辅助小区上发起随机接入过程来获取 TA。该辅助 TA = TA_msg2 + delta或 2 * TA_msg2 - TA— pcell。 其中， TA— msg2为该随机接入过程的 消息 2中携带的 TA, delta为辅助小区下行载波的定时值和主小区下行载波 的定时值之间的差值， TA— pcell为主小区的 TA。
S701、 基站为终端配置辅助小区。
在本实施例中， 基站可以为终端配置辅助小区 SCelM , 并指示 SCelll 与主小区 PCell不属于同一个 TA组， SCelh属于另一个 TA组， 即 TAG2。
S702、 终端接收到基站发送的辅助小区激活命令。
该命令用于激活辅助小区 SCelll。
S703、终端以主小区 PCell为参考小区，在 SCell 1上发起随机接入过程。 终端在接收到基站发送的辅助小区激活命令后， 或者激活 SCelM后， 如果终端发现 SCelh的辅助 TAT没有运行，则终端可以发起随机接入过程获 取 Scell的辅助 TA。 其中， 终端以 PCell为参考小区， 即终端以 PCell的下行 载波为参考， 终端在选定 SCelM上行子帧 n的 PRACH发送前导码 ( preamble ) 时， 前导码的开始发送时刻为 PCell对应下行子帧 n的开始接 收时刻， n可以为标识子帧的非负整数或用于标识子帧的符号或字符等。
S704、 终端接收基站发送的随机接入过程的消息， 获取辅助 TA。
终端接收基站发送的随机接入过程的消息 2, 根据该随机接入过程的消 息 2中携带的 TA获取 ScelM的辅助 TA2, 从而可以启动 Scell的辅助 TAT。
图 9为图 8提供的实施例中获取辅助 TA的示意图， TA2的计算方法如图 9 所示：
图 9中， Msg1为随机接入过程中的消息 1 , 其中可以包括前导码， eNB 为演进型基站（ evolved NodeB ) 。
TA2 = TA_msg2 + delta或 TA2 = 2 χ TA_msg2 - TA— pcell或 TA2 = TA— pcell + 2 x delta。其中，TA— msg2为该随机接入过程的消息 2指示的 TA, delta为辅助小区下行载波和主小区下行载波的定时值之间的差值， TA— pcell为主小区的 TA。
由于现有技术中，如果辅助 TAT超时后，终端将刷新所有上行混合自动 重传请求 ( Hybrid Automatic Repeat Request; HARQ )的緩存 ( buffer ) , 并且清空上行下行半静态调度的资源， 通知无线资源控制协议 （ Radio Resource Control; RRC )层释放物理上行链路控制信道（ Physical Uplink Control Channel; PUCCH )和/或 Sounding参考信号（ Sounding Reference Signal; SRS ) 资源。 但这将导致 PUCCH、 SRS和半静态调度资源被错误 释放， 进而影响数据传输。 并且， 基站在获知辅助小区上行失步之前， 可 能会继续调度失步的辅助小区， 从而造成资源浪费， 并且可能会因为应用 无效的辅助 TA而导致上行沖突。
本发明实施例还提供了解决现有技术中 PUCCH、 SRS和半静态调度资 源被错误释放影响数据传输， 以及基站调度失步的辅助小区造成的资源浪 费和上行沖突问题的方法。 图 10为本发明提供的上行失步处理方法的流程 图， 如图 10所示， 该方法具体包括：
S801、 终端启动配置的辅助小区的辅助 TAT。
S802、 若所述辅助小区的辅助 TAT超时， 所述终端通知基站， 和 /或停 止所述辅助小区上的上行传输， 和 /或激活所述辅助小区。
在本发明实施例中， 终端例如可以根据上述辅助定时提前量的获取方 法实施例提供的方法获取辅助小区的辅助 TA, 从而启动辅助小区的辅助 TAT。
例如， 基站为终端配置辅助小区 SCelll和 SCell2 , 并激活 SCelll和 SCell2,基站在配置消息中指示 SCelll和 SCell2同属 TAG2,终端启动 SCelH 和 SCell2的辅助 TAT, 即 TAT2。 如果 TAT2超时， 则终端通知基站， 和 /或 停止 SCelll及 SCell2上的所有上行传输， 和 /或去激活 SCelll和 SCell2。
终端可以通过 RRC信令（可以是新定义的 RRC信令）或媒体接入控制 组成单元 ( Media Access Control Component Element; MAC CE )或物 理层（ Physical; PHY )信令在主小区或其它上行同步的辅助小区上通知基 站由于 TAT2超时而导致上行失步。 终端还可以停止所有上行传输， 具体可 以停止包括物理上行共享信道 PUSCH、 物理上行控制信道 PUCCH和 Sounding参考信号 SRS的传输。从而避免资源浪费和可能出现的上行沖突。
需要说明的是， 该方法可以与本发明实施例提供的辅助定时提前量的 获取方法配合使用， 以节约信令开销和系统资源， 并且避免资源浪费和可 能出现的上行沖突。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流 程， 是可以通过计算机程序来指令相关的硬件来完成， 或者可以通过芯片 或处理器来完成， 所述的程序可存储于一计算机可读取存储介质中， 该程 序在执行时， 可包括如上述各方法的实施例的流程。 其中， 所述的存储介 质可为磁碟、 光盘、 只读存储记忆体（Read-Only Memory, ROM )或随 机存储记忆体 ( Random Access Memory, RAM )等。
图 1 1本发明提供的终端的一个实施例的结构示意图，本发明实施例提 该终端包括： 接收单元 11、 随机接入单元 12和获取单元 13;
接收单元 1 1 , 用于接收辅助小区激活命令， 所述辅助小区的辅助定时 提前量 TA与主小区的主 TA不同；
随机接入单元 12, 用于所述接收单元 1 1接收所述辅助小区随机接入命 令后， 或者在所述辅助小区激活后， 若所述辅助小区的辅助时间对齐定时 器 TAT没有运行， 发起随机接入过程；
获取单元 13 , 用于根据所述随机接入过程中接收的 TA获取所述辅助
TA。
其中， 当接收单元 1 1接收到基站发送的辅助小区激活命令后， 或者是 辅助小区激活后， 如果辅助小区的辅助 TAT没有运行， 则随机接入单元 12 可以发起随机接入过程以获取该辅助小区的辅助 TA。 随机接入单元 12可以 在接收单元 1 1接收到基站发送的辅助小区激活命令后， 或者是辅助小区激 活后， 如果辅助小区的辅助 TAT没有运行， 立即主动发起随机接入， 或者， 随机接入单元 12可以不主动发起随机接入， 而是在接站的触发下发起随机 接入， 例如， 可以是在终端接收到随机接入命令后， 根据随机接入命令发 起随机接入过程。 或者， 随机接入单元 12还可以根据一个设定的随机接入 定时器设定的时长确定随机接入， 如果终端在随机接入定时器设定的时长 内收到了随机接入命令， 随机接入单元 12可以根据随机接入命令指示的参 考小区发起随机接入， 或者在承载该随机接入命令的小区上发起随机接入； 如果在超过随机接入定时器设定的时长仍未收到随机接入命令， 则随机接 入单元 12可以以辅助小区为参考小区， 在该辅助小区上发起随机接入。
如果辅助小区与主小区不属于同一 TA组的辅助小区具有 PRACH资源， 或者辅助 TA与主小区的主 TA不属于同一 TA组的多个辅助小区中至少有一 个辅助小区具有 PRACH资源， 则随机接入单元 12可以以具有 PRACH资源 的辅助小区为参考小区， 在该辅助小区上发起随机接入过程。
随机接入单元 12发起的随机接入过程可以是主动发起的， 或者， 也可 以是在基站的触发下发起的， 接收单元 1 1还可以接收基站发送的随机接入 命令， 例如， 随机接入单元 12根据接收到基站发送的随机接入命令， 发起 随机接入过程。 随机接入单元 12可以根据该指示的参考小区， 在具有 PRACH资源的辅助小区上发起随机接入过程； 或者可以以承载随机接入命 令的小区为参考小区， 在承载随机接入命令的小区上发起随机接入过程。 另外， 终端可以包括随机接入定时器， 如果在超过随机接入定时器单元设 定的时长仍未收到基站发送的随机接入命令， 随机接入单元 12仍可以以辅 助小区为参考小区， 在该辅助小区上发起随机接入过程。 在辅助小区上发 起随机接入时， 获取单元 13获取得到的辅助 TA可以为在随机接入过程中接 收到的 TA。
另外， 随机接入单元 12还可以以主小区为参考小区， 在辅助小区上发 起随机接入过程， 在这种情况下， 获取单元 13获取的辅助 TA可以不是基站 在随机接入过程中发送的 TA, 终端获取的辅助 TA可以是辅助小区下行载波 的定时值与主小区下行载波的定时值的差值， 与基站发送的辅助 TA为随机 接入过程中接收的 TA获取辅助 TA之和。 或者， 获取单元 13获取的辅助 TA 可以为随机接入过程中接收的 TA的 2倍与主小区 TA的差值。
当终端的所有辅助小区均不具有 PRACH资源时， 随机接入单元 12还可 以以辅助小区为参考小区， 在主小区上发起随机接入过程。 这种情况下， 获取单元 13获取的辅助 TA可以辅助小区下行载波的定时值和主小区下行载 波的定时值的差值， 与基站在随机接入过程中发送的 TA之和； 或者获取单 元 13获取的辅助 TA可以为随机接入过程中接收的 TA的 2倍与主小区 TA的 差值。
本实施例提供的终端， 终端在接收到基站发出的激活辅助小区命令， 或者在辅助小区激活后， 发起随机接入过程以获取辅助定时提前量， 从而 节约信令开销和系统资源。
图 12本发明提供的终端的另一个实施例的结构示意图， 本发明实施例 示， 该终端包括： 接收单元 1 1、 随机接入单元 12和获取单元 13;
进一步的， 随机接入单元 12具体用于： 以辅助小区为参考小区， 在辅 助小区上发起随机接入过程。
接收单元 1 1还可以用于： 接收基站发送的随机接入命令。
若接收单元 1 1接收的随机接入命令中指示参考小区；
相应的， 随机接入单元 12可以用于： 根据随机接入命令中指示的参考 小区， 在辅助小区上发起随机接入过程。
随机接入单元 12还可以用于： 以承载随机接入命令的小区为参考小区， 在承载随机接入命令的小区上发起随机接入过程。
本实施例提供的终端还可以包括： 随机接入定时器 14, 用于在接收单 元接收 1 1基站发送的辅助小区激活命令后或者所述辅助小区激活后启动； 随机接入单元 12具体用于： 若超过随机接入定时器 14的设定时长仍未 收到基站发送的随机接入命令， 则以辅助小区为参考小区， 在辅助小区上 发起随机接入过程。
获取单元 13获取的所述辅助 TA为所述随机接入过程中接收的 TA。
随机接入单元 12还可以用于： 以主小区为参考小区， 在辅助小区上发 起随机接入过程； 或者， 以辅助小区为参考小区， 在主小区上发起随机接 入过程。
相应的，获取单元 13获取的所述辅助 TA为所述随机接入过程中接收 TA 与所述辅助小区下行载波和主小区下行载波的定时值的差值之和； 或者为 所述随机接入过程中接收的 TA的两倍与所述主小区 TA的差值。
随机接入单元 12还用于： 在发起随机接入过程中， 在发送前导码时以 所述参考小区的下行载波为参考。
本发明实施例提供的终端还可以包括： 启动单元 15;
启动单元 15, 用于根据获取单元 13获取的辅助 TA启动辅助 TAT 处理单元 16, 用于若辅助 TAT超时， 则通知基站辅助 TAT超时， 和 /或 停止在辅助 TAT对应的辅助小区进行上行传输， 和 /或去激活辅助 TAT对应 的辅助小区。
本发明实施例还可以提供一种终端， 该终端可以单元包括图 12中所示 的启动单元 15和处理单元 16。 该终端可以通过本发明实施例中提供的获取 TA的方法实施例获取辅助小区的辅助 TA。
在前一实施例的基础上， 可以设置一个随机接入定时器 14, 如果在超 过随机接入定时器 14的设定时长， 接收单元 11仍未收到基站发送的随机 接入命令， 则随机接入单元 12仍可以以辅助小区为参考小区， 在该辅助小 区上，或者在共用同一辅助 TA并且具有 PRACH资源的其他辅助小区上发 起随机接入过程。 这种情况下， 获取单元 13在随机接入过程中接收的基站 发送的 TA即为辅助 TA。
本发明实施例提供的终端， 为本发明实施例提供的辅助定时提前量的 获取方法的执行设备， 与本发明实施例提供的辅助定时提前量的获取方法 相对应， 其执行辅助定时提前量的获取方法的具体过程可参见方法实施例， 在此不再赘述。
本发明实施例提供的终端， 在接收到基站发出的激活辅助小区命令或 者辅助小区激活后， 发起随机接入过程以获取辅助定时提前量， 从而节约 信令开销和系统资源。
图 13为本发明提供的基站的一个实施例的结构示意图，本发明实施例 示， 基站包括： 第一发送单元 21和第二发送单元 22;
第一发送单元 21 , 用于向终端发送辅助小区激活命令。
第二发送单元 22, 用于根据所述终端发起的随机接入， 在所述随机接 入过程中向所述终端发送 TA; 所述随机接入由所述终端在接收到所述辅助 小区激活命令后， 或者根据所述辅助小区激活命令确认所述辅助小区激活 后， 若所述辅助小区的辅助 TAT没有运行后发起， 所述辅助小区的辅助 TA 与主小区的主 TA不同。
在本实施例中， 通过第二发送单元 22向终端发送 TA后， 可以以使终 端获取辅助 TA。
第一发送单元 21还可以用于： 在所述终端发起随机接入过程之前， 向 所述终端发送随机接入命令， 以使所述终端以承载所述随机接入命令的小 区为参考小区， 在所述承载所述随机接入命令的小区上发起随机接入过程； 若所述随机接入命令中指示参考小区， 则以使所述终端根据所述随机接入 命令中指示的参考小区， 在所述辅助小区上发起随机接入过程。
其中， 随机接入过程中向所述终端发送 TA为所述辅助 TA。
第一发送单元 21还可以用于： 在所述终端发起随机接入过程之前， 向 所述终端发送随机接入命令， 以使所述终端以所述主小区为参考小区， 在 所述辅助小区上发起随机接入过程； 或者以使所述终端以所述辅助小区为 参考小区， 在所述主小区上发起随机接入过程。
在本实施例中， 所述终端可以为图 1 1和图 12所示实施例中的终端。 本发明实施例提供的基站， 为本发明实施例提供的辅助定时提前量的 获取方法的执行设备， 与本发明实施例提供的辅助定时提前量的获取方法 相对应， 其执行辅助定时提前量的获取方法的具体过程可参见方法实施例， 在此不再赘述。
本发明实施例提供的基站， 在接收到基站发出的激活辅助小区命令或 者辅助小区激活后， 发起随机接入过程以获取辅助定时提前量， 从而节约 信令开销和系统资源。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对 其限制； 尽管参照前述实施例对本发明进行了详细的说明， 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发明各实施例技术方案的范围。

Claims

权利要求
1、 一种辅助定时提前量的获取方法， 其特征在于， 包括：
终端在接收辅助小区激活命令后， 或者， 在所述辅助小区激活后， 若 所述辅助小区的辅助时间对齐定时器 TAT没有运行， 发起随机接入过程； 所述终端根据所述随机接入过程中接收的 TA获取所述辅助小区的辅助 定时器提前量 TA。
2、 根据权利要求 1所述的方法， 其特征在于， 所述终端在接收所述辅 助小区激活命令后， 或者， 在所述辅助小区激活后， 所述辅助小区的辅助 TAT没有运行， 发起所述随机接入过程包括：
所述终端在接收辅助小区激活命令后， 或者， 在所述辅助小区激活后， 若所述辅助小区的辅助 TAT没有运行， 直接发起所述随机接入过程； 或者， 所述终端在接收所述辅助小区激活命令后， 或者， 在所述辅助小区激 活后，若所述辅助小区的辅助 TAT没有运行，若所述终端接收到随机接入命 令， 根据所述随机接入命令发起所述随机接入过程； 或者，
所述终端在接收所述辅助小区激活命令后， 或者， 在所述辅助小区激 活后， 若所述辅助小区的辅助 TAT没有运行， 启动随机接入定时器，
若在所述随机接入定时器设定的时长内收到所述随机接入命令， 根据 所述随机接入命令发起所述随机接入过程，
若在所述随机接入定时器设定的时长内没有收到所述随机接入命令， 在所述随机接入定时器设定的时长超时后直接发起所述随机接入过程。
3、 根据权利要求 2所述的方法， 其特征在于， 所述直接发起所述随机 接入过程包括：
以所述辅助小区为参考小区， 在所述辅助小区上发起所述随机接入过 程。
4、 根据权利要求 2所述的方法， 其特征在于， 所述根据所述随机接入 命令发起所述随机接入过程包括：
根据所述随机接入命令中指示的参考小区， 在所述辅助小区上发起所 述随机接入过程； 或者，
所述终端以承载所述随机接入命令的小区为参考小区， 在所述承载所 述随机接入命令的小区上发起所述随机接入过程。
5、 根据权利要求 1或 2所述的方法， 其特征在于， 所述辅助 TA为所述 随机接入过程中接收的 TA。
6、 根据权利要求 1或 2所述的方法， 其特征在于， 所述发起所述随机接 入过程具体为：
以所述主小区为参考小区， 在所述辅助小区上发起所述随机接入过程； 或者，
以所述辅助小区为参考小区， 在所述主小区上发起所述随机接入过程。
7、 根据权利要求 6所述的方法， 其特征在于， 所述辅助 TA为所述辅助 小区的下行载波的定时值和所述主小区的下行载波的定时值的差值， 与所 述随机接入过程中接收的 TA之和； 或者，
所述辅助 TA为所述随机接入过程中接收的 TA的两倍与所述主小区的 TA的差值。
8、 根据权利要求 1或 2所述的方法， 其特征在于， 还包括： 根据所述辅 助 TA, 启动所述辅助小区的辅助 TAT;
若所述辅助 TAT超时， 则通知所述基站， 和 /或停止在所述辅助 TAT对 应的辅助小区进行上行传输， 和 /或去激活所述辅助 TAT对应的辅助小区。
9、 一种终端， 其特征在于， 包括：
接收单元， 用于接收辅助小区激活命令；
随机接入单元， 用于所述接收单元接收所述辅助小区随机接入命令后 或者在所述辅助小区激活后， 若所述辅助小区的辅助时间对齐定时器 TAT 没有运行， 发起随机接入过程； 获取单元， 用于根据所述随机接入过程中接收的 TA获取所述辅助小区 的辅助定时提前量 TA。
1 0、 根据权利要求 9所述的终端， 其特征在于， 所述随机接入单元进一 步用于： 以所述辅助小区为参考小区， 在所述辅助小区上发起所述随机接 入过程。
1 1、 根据权利要求 9所述的终端， 其特征在于， 所述接收单元还用于： 接收所述基站发送的随机接入命令；
所述随机接入单元进一步用于： 根据所述随机接入命令中指示的参考 小区， 在所述辅助小区上发起所述随机接入过程； 或者， 以承载所述随机 接入命令的小区为参考小区， 在所述承载所述随机接入命令的小区上发起 所述随机接入过程。
12、 根据权利要求 9或 10所述的终端， 其特征在于， 还包括： 随机接入 定时器， 用于在所述接收单元接收基站发送的辅助小区激活命令后或者所 述辅助小区激活后启动；
所述接收单元还用于： 接收所述基站发送的随机接入命令；
所述随机接入单元进一步用于： 若在所述随机接入定时器设定的时长 内所述接收单元收到所述随机接入命令， 根据所述随机接入命令发起所述 随机接入过程； 若在所述随机接入定时器设定的时长内所述接收单元没有 收到所述随机接入命令， 在所述随机接入定时器设定的时长超时后发起直 接随机接入。
13、 根据权利要求 9或 10所述的终端， 其特征在于， 所述获取单元获取 的所述辅助 TA为所述随机接入过程中接收的 TA。
14、 根据权利要求 9所述的终端， 其特征在于， 所述随机接入单元进一 步用于： 以所述主小区为参考小区， 在所述辅助小区上发起所述随机接入 过程； 或者， 以所述辅助小区为参考小区， 在所述主小区上发起所述随机 接入过程。
15、 根据权利要求 14所述的终端， 其特征在于， 所述获取单元获取的 所述辅助 TA为所述辅助小区的下行载波的定时值和所述主小区的下行载波 的定时值的差值， 与所述随机接入过程中接收 TA之和； 或者所述获取单元 获取的所述辅助 TA为所述随机接入过程中接收的 TA的两倍与所述主小区 TA的差值。
16、 根据权利要求 9所述的终端， 其特征在于， 还包括：
启动单元， 用于根据所述获取单元获取的所述辅助 TA启动所述辅助 TAT;
处理单元， 用于若所述辅助 TAT超时， 则通知所述基站， 和 /或停止在 所述辅助 TAT对应的辅助小区进行上行传输，和 /或去激活所述辅助 TAT对 应的辅助小区。
17、 一种基站， 其特征在于， 包括：
第一发送单元， 用于向终端发送辅助小区激活命令；
第二发送单元， 用于根据所述终端发起的随机接入， 在所述随机接入 的过程中向所述终端发送 TA; 所述随机接入由所述终端在接收到所述辅助 小区激活命令后， 或者根据所述辅助小区激活命令确认所述辅助小区激活 后， 若所述辅助小区的辅助 TAT没有运行后发起的。
18、 根据权利要求 17所述的基站， 其特征在于， 所述第一发送单元还 用于在所述终端发起所述随机接入之前， 向所述终端发送随机接入命令。
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JP2014509809A (ja) 2014-04-21
ES2739217T3 (es) 2020-01-29
EP3598836B1 (en) 2022-05-04
CN106060919B (zh) 2019-11-29
CN106060919A (zh) 2016-10-26
US20140029575A1 (en) 2014-01-30
US20170041893A1 (en) 2017-02-09
EP3125636A1 (en) 2017-02-01
CN105979576A (zh) 2016-09-28
US20180234932A1 (en) 2018-08-16
JP5894652B2 (ja) 2016-03-30

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