WO2011082599A1 - 多载波系统上行链路的维护方法、装置及系统 - Google Patents

多载波系统上行链路的维护方法、装置及系统 Download PDF

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Publication number
WO2011082599A1
WO2011082599A1 PCT/CN2010/077632 CN2010077632W WO2011082599A1 WO 2011082599 A1 WO2011082599 A1 WO 2011082599A1 CN 2010077632 W CN2010077632 W CN 2010077632W WO 2011082599 A1 WO2011082599 A1 WO 2011082599A1
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WIPO (PCT)
Prior art keywords
user equipment
base station
component carrier
uplink synchronization
timeout
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PCT/CN2010/077632
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English (en)
French (fr)
Inventor
施小娟
戴谦
黄亚达
Original Assignee
中兴通讯股份有限公司
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Publication of WO2011082599A1 publication Critical patent/WO2011082599A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Definitions

  • the present invention relates to the field of communications, and in particular to a method, an apparatus, and a system for maintaining an uplink of a multi-carrier system.
  • LTE-Advanced Long Term Evolution Advance
  • 3GPP 3rd Generation Partner Project
  • IMT-Advanced International Mobile Telecommunication-Advanced
  • 4 dance standards 4 dance standards.
  • LTE-Advanced system is an evolved version based on Long Term Evolution (LTE). It introduces many new technologies to meet the basic needs of IMT-Advanced. One of the most important technologies is carrier aggregation. .
  • the LTE-Advanced system Due to the current shortage of wireless spectrum resources, the spectrum resources owned by mobile operators in the world tend to be scattered, and IMT-Advanced requires higher peak rate indicators (100 Mbps for high mobility and 1 Gbps for mobility).
  • the current 20MHz bandwidth of the current LTE standard cannot meet the requirements of IMT-Advanced, so it needs to be expanded to higher bandwidth, such as 40MHz, 60MHz, or even higher.
  • One of the methods to increase the bandwidth and peak rate is to expand the frequency domain. For example, several 20-MHz LTE bands are used to expand the bandwidth by "carrier aggregation", which is the essence of carrier aggregation technology. Therefore, the LTE-Advanced system also belongs to a multi-carrier system.
  • the carrier participating in the aggregation is called a component carrier, and the user equipment (User Equipment, UE for short) can be performed on multiple component carriers and the base station (eNB) at the same time.
  • the component carrier may use a frequency band already defined by LTE, or may use a frequency band specifically added for LTE-Advanced. Based on the current spectrum resource shortage, it is impossible to always have a continuous component carrier in the frequency domain that can be allocated to the operator, so the component carrier may be continuous or discontinuous in the frequency band.
  • the UE can transmit and receive on multiple component carriers simultaneously in the RRC connected state (RRC_CONNECTED), but for the idle state (RRC_IDLE) UE, LTE-like, can only reside on one component carrier, after the UE successfully accesses the component carrier, that is, after the UE establishes an RRC connection on the component carrier, the base station can use dedicated RRC signaling according to service requirements.
  • the UE allocates a new component carrier, and after the new component carrier is allocated, there are two behaviors of the base station and the UE: Behavior 1: After allocating a new component carrier, the base station and the UE perform data transmission and reception on the newly added component carrier. That is, the newly added component carrier is activated after being configured.
  • Behavior 2 After allocating a new component carrier, the base station and the UE do not immediately perform data transmission and reception on the newly added component carrier, that is, the base station does not send the service data to the UE on the newly added component carrier, and the UE saves the added
  • the configuration information on the component carrier does not send service data to the base station on the newly added component carrier, and waits for further action of the base station.
  • the subsequent base station can activate the component carrier according to the service requirement, and after the component carrier is activated, the base station and the UE can perform data transmission and reception on the component carrier.
  • the base station in order to implement and maintain uplink synchronization between the user equipment and the base station, the base station sends a timing advance (Timing Advance, abbreviated as TA) to each user equipment according to the transmission delay between the base station and each user equipment.
  • TA Timing Advance
  • the device advances or delays the timing of the respective uplink transmission according to the timing advance sent by the base station, thereby compensating for the transmission delay of the terminal to the base station in the user, so that the uplink signals of different user equipments reach the base station within the receiving window of the base station.
  • the base station in order to obtain and maintain the uplink synchronization between the UE and the base station, the base station configures an uplink synchronization timer (TAT) for the UE. If the UE can receive the time sent by the base station to the UE before the TAT expires, If the amount is advanced, it is considered that the UE maintains uplink synchronization with the base station. Otherwise, the TAT timeout has not received the time advance amount sent by the base station to the UE, and the UE considers that the uplink synchronization is lost.
  • TAT uplink synchronization timer
  • the UE obtains uplink synchronization with the base station by using a random access procedure, and after receiving the random access response sent by the base station, the UE starts the timer TAT, and then starts the data.
  • the timing advance of the base station in the random access response advances or delays the timing of the uplink transmission.
  • the UE considers that it continues to maintain uplink synchronization with the base station; if the UE does not receive the TA command during the TAT operation, that is, when the TAT times out, the UE considers that it has lost uplink synchronization with the base station, deletes all uplink and downlink resources dynamically allocated to the UE, and clears All the hybrid adaptive retransmission buffer ( HARQ buffer ) data to be sent in the uplink, and the radio resource control (RRC) sublayer is released to release the static/semi-static uplink physical resources allocated to the UE. Thereafter, if there is uplink data to be transmitted or downlink data needs to be received, the UE needs to perform random access first to regain uplink synchronization.
  • HARQ buffer hybrid adaptive retransmission buffer
  • the user equipment can work on multiple component carriers at the same time.
  • the component carriers can be continuous or discontinuous in the frequency band. They can be in the same frequency band or from different frequency bands. In the case where the component carriers are discontinuous, or the component carriers are from different frequency bands, since each component carrier has different transmission characteristics, the timing advances on the component carriers may be different from each other; even if each component carrier belongs to the same frequency band and Continuous in the frequency band, if each component carrier originates from a different Remote Radio Units (RRU), or in order to increase cell coverage, each component carrier is processed by a different repeater, then each component The timing advances on the carrier may also differ from each other.
  • RRU Remote Radio Units
  • the UE In the LTE system, the UE only works on one carrier (one carrier for the time division duplex mode, and one pair of uplink and downlink carriers for the frequency division duplex mode, which is referred to as a carrier for convenience), and only needs to maintain one uplink.
  • the uplink synchronization of the link, in the carrier aggregation the UE can work on multiple component carriers at the same time, and the TAs of these component carriers may be different. Therefore, how to maintain uplink synchronization on the multiple uplinks is carrier aggregation.
  • An effective solution has not been proposed for the problem of poor maintenance reliability and robustness of the uplink in a multi-carrier system in the related art.
  • a primary object of the present invention is to provide a method, apparatus, and system for maintaining a multi-carrier system uplink to solve at least the above problems.
  • a method for maintaining an uplink of a multi-carrier system including: the user equipment detects that an uplink synchronization timer expires on a part of the component carriers that are working; and the user equipment notifies the base station about the timeout. Information, or user equipment to activate or delete part of the component carrier.
  • the user equipment detects that the uplink synchronization timer expires on the part of the component carrier that is in operation: the user equipment maintains an independent uplink synchronization timer for each component carrier that is working, and the user equipment detects one or more of the component carriers.
  • the uplink synchronization timer expires on the component carriers; or the user equipment divides the working component carriers into different component carrier groups according to different timing advances, and maintains an independent uplink synchronization timer for each component carrier group, and the user equipment detects The uplink synchronization timer to one or more component carrier groups times out.
  • the user equipment notifying the base station of the information about the timeout includes: the user equipment notifying the base station of the information about the timeout by using the component carrier that the uplink synchronization timer does not time out.
  • the user equipment notifying the base station of the information about the timeout includes: the user equipment notifying the base station of the information about the timeout through the medium access control unit.
  • the information about the timeout includes: information characterizing a partial component carrier.
  • the method further includes: the user equipment receiving the command message from the base station, wherein the command message is used to indicate that the partial component carrier is deactivated or deleted.
  • the method further includes: the user equipment receives the command message from the base station, where the command message is used to indicate that the uplink synchronization of the partial component carriers is reacquired.
  • the method further includes: the user equipment receiving the command message from the base station, wherein the command message is used to indicate that the uplink synchronization is maintained on the partial component carrier.
  • a user equipment including: a detecting module, detecting an uplink synchronization timer timeout on a part of component carriers that are working; and a processing module, configured to deactivate or delete a part of component carriers.
  • a user equipment including: a detecting module, detecting an uplink synchronization timer timeout on a part of component carriers that are working; and a sending module, configured to notify the base station of information about a timeout.
  • a maintenance system for a multi-carrier system uplink including: a user equipment, notifying a base station that a timeout timer of a part of component carriers is detected to be timed out Timeout information or deactivating or deleting part of the component carrier; the base station, when receiving the timeout information, sends a command message to the user equipment, the command message is used to indicate to deactivate or delete part of the component carrier, or for indicating Re-acquiring the uplink synchronization of some component carriers, or indicating that the uplink synchronization is maintained on some component carriers.
  • the user equipment notifies the base station of the information about the timeout by using the component carrier that the uplink synchronization timer does not time out.
  • the user equipment detects that the uplink synchronization timer expires on the part of the component carrier that is working, the user equipment notifies the base station of the information about the timeout, or the user equipment deactivates or deletes part of the component carrier, and solves the problem in the multi-carrier.
  • FIG. 1 is a schematic diagram of coverage of carrier aggregation according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for maintaining uplink of a multi-carrier system according to an embodiment of the present invention
  • FIG. 4 is a flowchart of separately maintaining uplinks on component carriers according to an embodiment of the present invention
  • FIG. 5 is a flowchart of whether uplinks are respectively maintained on each component carrier according to an embodiment of the present invention
  • FIG. 6 is a flow chart of performing uplink maintenance in the same manner according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a user equipment according to an embodiment of the present invention
  • FIG. 1 is a schematic diagram of coverage of carrier aggregation in accordance with an embodiment of the present invention.
  • the following is an example of a Frequency Division Duplex (FDD).
  • FDD Frequency Division Duplex
  • component carrier 1 downlink frequency fl, uplink frequency point fl'
  • component carrier 2 downlink frequency f2, uplink frequency point ⁇ '
  • component carrier 3 downstream frequency point ⁇ , uplink frequency point ⁇ '
  • CC3 DL ⁇ , UL G'
  • the user equipment UE resides on CC1, and the UE does not currently establish any service, and is in an idle state.
  • the UE and the base station respectively maintain uplink synchronization on each component carrier.
  • component carrier 1, component carrier 2, and component carrier 3 may perform carrier aggregation, where component carrier 1 and component carrier 2 have the same ,, component carrier 3 and The chirps of the other two component carriers are different.
  • the user equipment UE resides on CC1, and the UE does not currently establish any service, and is in an idle state.
  • the UE and the base station perform the uplink synchronization maintenance according to whether the UI is the same, that is, the uplink synchronization is uniformly maintained on the same multiple CCs.
  • the uplink synchronization is maintained independently between CCs.
  • a method for maintaining an uplink of a multi-carrier system is provided.
  • 2 is a flow chart of a method for maintaining an uplink of a multi-carrier system according to an embodiment of the present invention.
  • the method includes the following steps: step S202 to step 4: S202: Step S202: The user equipment detects that the uplink synchronization timer expires on the part of the component carrier that is working. Step S204: The user equipment notifies the base station about Timeout information, or user equipment to deactivate or delete part of the component carrier.
  • the user equipment detects that the uplink synchronization timer timeout on the part of the component carrier that is working includes: the user equipment maintains an independent uplink synchronization timer for each component carrier that is working, and the user equipment detects one or more components.
  • the uplink synchronization timer on the carrier times out; or the user equipment divides the working component carriers into different component carrier groups according to whether the time advance (() is the same, and maintains an independent uplink synchronization timer for each component carrier group.
  • the user equipment detects that the uplink synchronization timer expires on one or more component carrier groups.
  • the information that the user equipment notifies the base station about the timeout may include: the user equipment notifies the base station of the information about the timeout by using a component carrier that does not time out by the uplink synchronization timer.
  • the information that the user equipment notifies the base station about the timeout may include: the user equipment notifying the base station of the information about the timeout through the medium access control unit.
  • the foregoing information about the timeout includes: information indicating a partial component carrier.
  • the method may further include: the user equipment receives the command message from the base station, where the command message is used to indicate that the partial component carrier is deactivated or deleted.
  • the method may further include: the user equipment receives the command message from the base station, where the command message is used to indicate that the uplink synchronization of the partial component carrier is re-acquired.
  • the method may further include: the user equipment receives the command message from the base station, where the command message is used to indicate that the uplink synchronization is maintained on the partial component carrier.
  • the method may further include: determining, by the user equipment, whether the added TA of the one or more component carriers is the same as the TA of the working component carrier; If the determination result is yes, the user equipment directly starts the uplink synchronization timer for the newly added one or more component carriers; if the determination result is no, the user equipment performs the new one or more component carriers. Random access.
  • FIG. 3 is a timing diagram of performing uplink maintenance on each component carrier according to an embodiment of the present invention
  • FIG. 4 is a flowchart of separately maintaining an uplink on each component carrier according to an embodiment of the present invention. As shown in FIG. 3 and FIG.
  • the present invention takes a frequency division duplex mode as an example, wherein component carrier 1, component carrier 2, and component carrier 3 can perform carrier aggregation.
  • the user equipment UE resides on CC1, and the UE does not currently establish any service, and is in an idle state.
  • the UE and the base station respectively maintain the uplink synchronization on each component carrier in the embodiment, and the specific process is as shown in FIG. 4, and the method includes the following steps.
  • Step S301 The UE first acquires uplink synchronization with the serving base station on the resident component carrier CC1.
  • the UE performs random access on the component carrier CC1, and after receiving the random access response fed back to the UE by the serving base station, the UE starts the uplink synchronization timer TAT1 on CC1 (as shown in point A in FIG. 3), and according to random Calculate the uplink transmission on CC1 ( fl, ) when the timing advance carried in the access response is calculated.
  • Step S302 The UE maintains uplink synchronization on the component carrier CC1.
  • Step S303 The UE acquires uplink synchronization on the newly added component carrier CC2.
  • the monthly service base station allocates and activates the new component carrier CC2 for the UE according to the service requirement, and indicates whether the TA of the CC2 is the same as CC1 (this embodiment assumes the same).
  • the UE acquires uplink synchronization on CC2 according to whether the TA of CC2 is the same as CC1. That is, if the TA of CC2 is the same as CC1, the UE directly starts the uplink synchronization timer TAT2 on CC2 (as shown in point B of FIG. 3), and directly calculates the latest timing advance on CC1 in CC2 (f2). Uplink transmission timing on '). If the TA of the CC2 is different from the CC1, the UE performs random access on the component carrier CC2. After receiving the random access response fed back to the UE by the serving base station, the UE starts TAT2 and advances according to the time carried in the random access response.
  • the amount calculates the uplink transmission timing on CC2 (f2').
  • the durations of TAT1 and TAT2 can be configured to be the same or different according to actual needs. It should be noted that, while the UE acquires the uplink synchronization on the newly added component carrier CC2, the UE continues to maintain the uplink synchronization on the component carrier CC1.
  • Step S304 The UE and the serving base station respectively maintain uplink synchronization on the component carriers CC1 and CC2. That is, the serving base station transmits a TA command on CC1 ( fl ), CC2 ( f2 ), respectively; the UE restarts TAT1/TAT2 according to the TA command sent on CC1/CC2.
  • the UE if receiving the TA command sent by the serving base station on CC1, the UE restarts TAT1 and calculates the uplink transmission timing on CC1 (fl ') using the timing advance carried in the TA command; also in TAT2 During operation, if receiving the TA command sent by the serving base station on CC2, the UE restarts TAT2 and calculates the uplink transmission opportunity on CC2 ( ⁇ 2 ' ) using the timing advance carried in the TA command.
  • the serving base station may carry information indicating the component carrier in the ⁇ command, and after receiving the ⁇ command, the UE determines, based on the information, which ⁇ command on the component carrier.
  • Step S305 The UE does not receive the TA command sent by the serving base station on the CC1 during the TAT1 operation, that is, the TAT1 times out, but the TAT2 has not timed out yet (as shown in FIG. 3C); the UE transits to the maintenance uplink.
  • Step S306-1 The UE continues to perform normal data communication and link maintenance on CC2 (as shown in FIG. 3, the UE receives the TA command sent on CC2, restarts TAT2), and the UE notifies the monthly service through CC2.
  • the specific notification mode may be: sending a special uplink MAC address (Medium Access Control Element) on the CC2, where the MAC CE carries information indicating CC1 (fl'). For example, the frequency information of the CC1, or the identification information (or index information) of the CC1 allocated by the serving base station when the CC1 is allocated to the UE.
  • the base station allocates CC1 and CC2 respectively when allocating CC1 and CC2 to the UE.
  • Two identification information, CC 1 is the identifier 1 and CC 2 is the identifier 2
  • the information representing the CC1 ( fl ' ) carried in the MAC CE is the identifier 1.
  • the MAC CE is used to indicate that the indicated component carrier uplink is out of synchronization, or the TAT is timed out.
  • the UE stops transmitting uplink data on CC1 and waits for a command from the serving base station. After receiving the uplink situation of the CC1 reported by the UE, the serving base station judges that the CC1 uplink is out of synchronization according to the factors such as the uplink synchronization and holding algorithm, the resource scheduling algorithm, and the downlink channel quality, or is not in the CC1 because the scheduling algorithm is unreasonable.
  • the TA command is sent, or because the CC1 downlink channel is too poor, the UE cannot correctly receive the TA command sent by CC1, and so on.
  • the serving base station may instruct the UE to perform random access on the CC 1 to reacquire the uplink synchronization according to the service requirement, or the serving base station may notify the UE to deactivate the CC1, or notify the UE to directly delete the configuration of the CC1; Because the scheduling algorithm is unreasonable and the TA command is not sent on the CC 1 for a long time, the monthly service base station can continue to schedule the UE on the CC 1 or send a new TA command to the UE. After receiving the UE, the TAT1 on the CC1 is started.
  • Step S306-2 The uplink synchronization of CC1 is re-maintained, and the transmission and reception transmission is restarted on CC1; if the downlink channel is too bad, the monthly service base station may notify the UE to deactivate CC1, or notify the UE to directly delete the configuration of CC1.
  • Step S306-2 The UE continues to perform normal data communication and link maintenance on the CC2 (as shown in FIG. 3, the UE receives the TA command sent on the CC2, restarts the TAT2), and the UE deactivates the CC1, that is, the UE. Save the configuration information on CC1, but do not send or receive service data on CC1; or directly delete the configuration of CC1.
  • the serving base station deactivates CC1 or deletes the configuration on CC1 according to the uplink synchronization holding algorithm or the scheduling mechanism.
  • the specific deactivation or deletion is agreed in advance by the UE and the serving base station, or by the agreement.
  • the uplink is independently maintained on each component carrier, and when the uplink synchronization timer expires on some component carriers, the UE notifies the serving base station, or deactivates/deletes these components.
  • the carrier continues to maintain normal communication on the uplink synchronized component carrier, which enhances the reliability of uplink maintenance, and finally ensures the continuity of data transmission, thereby providing a good service experience for the user equipment.
  • FIG. 5 is a timing diagram of performing uplink maintenance with whether TAs are the same according to an embodiment of the present invention
  • FIG. 6 is a flowchart of performing uplink maintenance with whether TAs are the same according to an embodiment of the present invention.
  • component carrier 1, component carrier 2, and component carrier 3 in the embodiment of the present invention may perform carrier aggregation, where component carrier 1 and component carrier 2 have the same TA, component carrier 3 and the other two.
  • the TAs of the component carriers are all different.
  • the user equipment UE resides on CC1, and the UE does not currently establish any service, and is in an idle state. When the UE needs to perform service transmission on multiple component carriers, in conjunction with FIG.
  • the UE and the base station perform uplink synchronization maintenance according to whether the TA is the same, that is, the uplink synchronization is uniformly maintained on multiple CCs with the same TA.
  • the TA is independently maintained between the different CCs.
  • the specific process is as shown in FIG. 6.
  • the method includes the following steps: Step S501: The method synchronizes the convergence S301.
  • Step S503 The serving base station allocates and activates the newly added component carrier CC2 for the UE according to the service requirement, and indicates that the TA of the CC2 is the same as the CC1.
  • the UE After receiving the allocation message, the UE determines that the uplink synchronization of CC2 is unified with CC1, that is, the UE uniformly maintains the uplink synchronization timer TAT1 on CC1 and CC2, and directly calculates the latest timing advance on CC1 in CC2 ( ⁇ ' Uplink transmission timing.
  • Step S504 The UE and the serving base station uniformly maintain uplink synchronization on the component carriers CC1 and CC2.
  • the serving base station may send the command in different manners according to different scheduling algorithms.
  • the serving base station sends the ⁇ command simultaneously on CC1 and CC2; the serving base station transmits or transmits the ⁇ command randomly in CCl and CC2; the serving base station selects the CC with the best channel quality (such as CC1) to send the ⁇ command; the serving base station first selects one in the After the ⁇ command is sent on the CC (such as CC1), the serving base station does not receive the UE feedback after the ⁇ command is retransmitted multiple times (such as ⁇ ) on the CC. Then the serving base station reselects other CCs (such as CC2) to send TA commands.
  • CC channel quality
  • Step S505 The UE acquires uplink synchronization on the newly added component carrier CC3.
  • the monthly service base station allocates and activates the new component carrier CC3 for the UE according to the service requirement, and indicates that the TA of CC3 is different from CC1/CC2.
  • the UE performs random access on the component carrier CC3. After receiving the random access response fed back to the UE by the serving base station, the UE starts TAT2 and calculates the time advance amount carried in the random access response on CC3 ( ⁇ '). Uplink transmission timing.
  • Step S506 The UE and the serving base station uniformly maintain uplink synchronization on CC1 and CC2, and independently maintain uplink synchronization on CC3. That is, the serving base station sends a ⁇ command on CC1 or CC2 by using the possible method described in step S504, and the serving base station independently transmits a ⁇ command on CC3; the UE restarts ⁇ 1/ ⁇ 2 according to the ⁇ command on CC1 or CC2, CC3, respectively.
  • Step S507 The UE does not receive the ⁇ command sent by the serving base station on CC1 or CC2 during the operation of TAT1, that is, TAT1 times out, but ⁇ 2 has not timed out at this time (point D shown in FIG. 5;). At this time, the UE transits to step S508-1 or step S508-2 of maintaining the uplink.
  • Step S508-1 The UE continues to perform normal data communication and link maintenance on the CC3 (as shown in FIG. 5, the UE receives the TA command sent on the CC3, restarts the TAT2), and the UE notifies the monthly service through CC3.
  • the specific notification mode may be: sending a special uplink access control element (MAC CE) on the CC3, the MAC CE carrying the representation CC1 (fl,) And/or CC2 (f2') information, such as frequency information of CC1 and/or CC2, or identification information (or index information) allocated by the serving base station when assigning CC1 and CC2 to the UE, as in this embodiment,
  • MAC CE special uplink access control element
  • CC1 fl,
  • CC2 f2'
  • identification information or index information allocated by the serving base station when assigning CC1 and CC2 to the UE, as in this embodiment
  • the base station allocates CC1, CC2, and CC3 to the UE, it assigns three identification information to CC1, CC2, and CC3 respectively.
  • CC1 is the identifier 1
  • CC2 is the identifier 2
  • CC3 is the identifier 3.
  • the characterization CC1 carried in the MAC CE ( The information of fl,) and/or CC2 (f2,) is the identifier 1 and/or the identifier 2.
  • the MAC CE is used to indicate that the indicated component carrier uplink is out of synchronization, or the TAT is timed out.
  • the UE stops transmitting uplink data on CC1 and CC2, waiting for the command of the serving base station.
  • the processing after the serving base station receives the uplink situation reported by the UE is the same as step S306-1.
  • Step S508-2 The UE continues to perform normal data communication and link maintenance on CC3 (as shown in FIG.
  • the UE receives the TA command sent on CC3, restarts TAT2), and the UE deactivates CC1 and CC2. That is, the UE saves the configuration information on CC1 and CC2, but does not perform service data transmission and reception on CC1 and CC2; or directly deletes the configurations of CC1 and CC2.
  • the serving base station is deactivated according to an uplink synchronization and maintaining algorithm or a scheduling mechanism.
  • CC1 and CC2 or J are set in addition to CC1 and CC2.
  • the specific deactivation or deletion is agreed in advance by the UE and the serving base station, or by the agreement.
  • CC group multiple CCs on the same TA
  • different CC groups independently maintain uplink synchronization.
  • the uplink synchronization timer of one or more CC groups partial component carriers
  • the UE notifies the serving base station, or deactivates/deletes these component carriers, and continues to maintain normal communication on the uplink synchronized component carriers, enhancing the uplink.
  • FIG. 7 is a schematic diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment includes: a detection module 701 and a sending module 702.
  • the detecting module 701 is configured to detect an uplink synchronization timer timeout on a part of the component carriers that are working, and the sending module 702 is connected to the detecting module 701, and configured to notify the base station of information about the timeout.
  • FIG. 8 is a schematic diagram of a user equipment according to an embodiment of the present invention. As shown in FIG.
  • the user equipment includes: a detection module 801 and a processing module 802.
  • the detecting module 801 is configured to detect an uplink synchronization timer timeout on a part of the component carriers that are working
  • the processing module 802 is connected to the detecting module 801, for deactivating or deleting part of the component carriers.
  • a maintenance system for an uplink of a multi-carrier system is provided.
  • the maintenance system of the uplink of the multi-carrier system includes: a user equipment, configured to notify the base station of information about timeout or deactivate or delete part of component carriers when detecting that the uplink synchronization timer expires on a part of the component carriers that are working.
  • a base station configured to send a command message to the user equipment when the timeout information is received, where the command message is used to indicate that the partial component carrier is deactivated or Delete, or used to indicate that the uplink synchronization of a part of the component carriers is reacquired, or to indicate that the uplink synchronization is maintained on a part of the component carriers.
  • the user equipment notifies the base station of the information about the timeout by using the component carrier that the uplink synchronization timer does not time out.
  • the uplink synchronization timer of the component carrier of the maintenance system of the multi-carrier system uplink times out, the UE notifies the service base station, or the UE deactivates the component carrier, or the UE deletes the component carrier.
  • the serving base station and the UE independently maintain the uplink on each component carrier.
  • the UE When the uplink synchronization timer of one or several component carriers expires, the UE notifies the serving base station of one or several components by using the component carrier that does not time out by the uplink synchronization timer.
  • the uplink condition of the carrier After receiving the notification from the UE, the serving base station notifies the UE to re-acquire the uplink synchronization on one or several component carriers, or informs the UE to deactivate one or several component carriers, or informs the UE to delete one or several component carriers, or continues to The UE is scheduled on one or several component carriers.
  • the serving base station and the UE independently maintain the uplink on each component carrier.
  • the UE deactivates one or several component carriers.
  • the serving base station and the UE independently maintain the uplink on each component carrier.
  • the UE deletes one or several component carriers.
  • the uplink base station and the UE uniformly maintain the uplink of the same component carrier group of the TA, and independently maintain the uplink of each component carrier group.
  • the uplink synchronization timer of one or several component carrier groups expires, the UE passes the uplink.
  • the component carrier in the component carrier group in which the synchronization timer does not time out notifies the uplink condition of one or several component carrier groups of the monthly service base station.
  • the serving base station and the UE uniformly maintain the uplink of the same component carrier group of the TA, and independently maintain the uplink of each component carrier group.
  • the UE deactivates one or several The component carrier group either deletes one or several component carrier groups.
  • the serving base station adds one or several component carriers
  • the UE acquires uplink synchronization on the newly added component carrier.
  • the UE starts the uplink synchronization timer for each newly added component carrier according to whether the TA of the newly added component carrier is the same as the component carrier that is already working. If the UE is different, the UE performs random access on the newly added component carrier.
  • modules or steps of the present invention may be Implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of computing devices, optionally, they may be implemented by program code executable by the computing device, such that They may be stored in a storage device by a computing device, and in some cases, the steps shown or described may be performed in an order different than that herein, or separately fabricated into individual integrated circuit modules. Alternatively, multiple modules or steps of them can be implemented as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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Abstract

本发明公开了一种多载波系统上行链路的维护方法、装置及系统。其中，该方法包括：用户设备检测到所工作的部分分量载波上的上行同步定时器超时，用户设备向基站通知关于超时的信息，或者用户设备去激活或删除部分分量载波。通过本发明，能够提高多载波系统下对上行链路的维护可靠性和健壮性。

Description

多载波系统上 4亍链路的维护方法、 装置及系统 技术领域 本发明涉及通信领域， 具体而言， 涉及一种多载波系统上行链路的维护 方法、 装置及系统。 背景技术 高级长期演进系 统 ( Long Term Evolution Advance , 简称为 LTE-Advanced ) 是第三代合作伙伴计划 ( the 3rd Generation Partner Project, 简称为 3GPP ) 组织为了满足国际电信联盟 （ International Telecommunication Union , 简称为 ITU ) , 高级国 际移动通讯 （ International Mobile Telecommunication-Advanced , 简称为 IMT-Advanced )的要求而 4舞出的标准。 LTE-Advanced系统是在长期演进系统 （ Long Term Evolution, 简称为 LTE ) 基础上的一个演进版本， 它引入了很多新技术来满足 IMT-Advanced的基本 需求， 其中最重要的一项技术就是载波聚合。 由于目前无线频谱资源的紧缺性， 世界各移动运营商拥有的频谱资源往 往比较零散， 而 IMT-Advanced要求峰值速率的指标更高 （高移动性下支持 100Mbps , 氏移动性下支持 1 Gbps ), 以目前的 LTE标准最大 20MHz的带宽 是无法满足 IMT-Advanced要求的， 所以需要扩充到更高带宽， 比如 40MHz、 60MHz, 甚至更高。 提高带宽和峰值速率的方法之一是对频域进行扩充， 例 如 ί巴几个基于 20MHz的 LTE频带通过 "载波聚合" 的方式进行带宽扩大， 这就是载波聚合技术的本质。 因此， LTE-Advanced系统也属于多载波系统。 应用了载波聚合技术的 LTE-Advanced 系统中， 参与聚合的载波被称为 分量载波（ Component Carrier ), 用户设备 （ User Equipment , 简称为 UE ) 可以同时在多个分量载波上和基站 （eNB ) 进行收发传输。 分量载波可以使 用 LTE已经定义的频段， 也可以使用为 LTE-Advanced专门新增的频段。 基 于目前频谱资源紧张， 不可能总有频域上连续的分量载波可以分配给运营商 使用， 因此分量载波在频带上可以是连续的， 也可以是不连续的。 引入载波聚合技术后， UE在 RRC连接态 （ RRC_CONNECTED ) 可以 同时在多个分量载波上进行收发传输，但是对于空闲态（ RRC_IDLE )的 UE, 像 LTE—样， 仅能驻留在一个分量载波上， UE在该分量载波上成功接入后， 即 UE在该分量载波上建立 RRC连接后， 根据业务需要， 基站可以通过专用 RRC信令为 UE分配新增分量载波， 分配这些新增分量载波后基站和 UE的 行为有两种： 行为 1 : 分配某一新增分量载波后， 基站和 UE即在该新增分量载波上 进行数据收发， 即该新增分量载波在配置后即被激活。 行为 2: 分配某一新增分量载波后， 基站和 UE并不立即在该新增分量 载波上进行数据收发，即基站并不在新增该分量载波上向 UE发送业务数据， UE 保存该新增分量载波上的配置信息， 也并不在该新增分量载波上向基站 发送业务数据， 等待基站的进一步动作。 后续基站可以根据业务需要去激活 该分量载波， 该分量载波被激活后， 基站和 UE才能在该分量载波上进行数 据收发。 在 LTE系统中， 为了实现并保持用户设备与基站之间的上行同步， 基站 根据基站与各用户设备之间的传输时延发送时间提前量 （Timing Advance, 简称为 TA ) 给各用户设备， 用户设备根据基站发送的时间提前量提前或推 迟各自上行传输的时机， 从而弥补用户中终端至基站的传输时延， 使得不同 用户设备的上行信号都在基站的接收窗口之内到达基站。
LTE 系统中， 为了获得并保持 UE与基站之间的上行同步， 基站为 UE 配置了一个上行同步定时器 （ timeAlignmentTimer , 简称为 TAT ), 若 UE能 在 TAT超时之前接收到基站发送给 UE的时间提前量， 则认为该 UE与该基 站之间保持上行同步， 否则 TAT超时还没有接收到基站发送给 UE的时间提 前量， UE认为失去上行同步。 在未同步状态或者失步状态， UE通过随机接 入过程获得与基站之间的上行同步， UE 接收到基站发送的随机接入响应 ( Random Access Response ) 后， 启动定时器 TAT, 并才艮据基站在随机接入 响应中携带的时间提前量提前或推迟上行传输的时机。 UE 获得与基站的上 行同步后， 在 TAT运行期间， 如果接收到基站发送给 UE的 TA命令 （TA command ), 则重启 TAT, 并使用 TA命令中携带的时间提前量提前或推迟上 行传输时间， UE认为自己继续与基站保持上行同步； 如果 UE在 TAT运行 期间没有接收到 TA命令， 即 TAT超时时， UE认为自己与基站失去了上行 同步， 删除动态分配给该 UE的所有上下行资源， 清空所有上行待发送的混 合自适应重传緩冲区（ HARQ buffer )数据，通知无线资源控制（ Radio Resource Control, 简称 RRC ) 子层释放掉分配给该 UE的静态 /半静态上行物理资源， 此后如果有上行数据需要发送或有下行数据需要接收， UE 都需要首先进行 随机接入以重新获得上行同步。 引入载波聚合后， 用户设备可以同时工作在多个分量载波上， 这些分量 载波在频带上可以是连续的， 也可以是不连续的； 可以是同一频带内的， 还 可以是来自于不同频带。 对于分量载波不连续的情况， 或者分量载波来自于 不同频带的情况， 由于各分量载波具有不同的传输特性， 各分量载波上的时 间提前量可能互不相同； 即使各分量载波属于同一频带且在频带上连续， 如 果各分量载波源自不同的射频拉远单元（ Remote Radio Units, 简称为 RRU ), 或者为了增加小区覆盖，各分量载波分别经由不同的中继器（ repeater )处理， 则各分量载波上的时间提前量也可能互不相同。 LTE 系统中， UE 只工作在 一个载波上 （对于时分双工模式是一个载波， 对于频分双工模式包括上行、 下行一对载波， 为描述方便， 这里简称一个载波）， 仅需要维护一条上行链路 的上行同步， 而在载波聚合中， UE 可以同时工作在多个分量载波上， 并且 这些分量载波的 TA有可能不同， 因此如何维护这多个上行链路上的上行同 步， 是载波聚合中亟需解决的课题。 针对相关技术中在多载波系统下对上行链路的维护可靠性和健壮性比较 差的问题， 目前尚未提出有效的解决方案。 发明内容 本发明的主要目的在于提供一种多载波系统上行链路的维护方法、 装置 及系统， 以至少解决上述问题。 才艮据本发明的一个方面， 提供了一种多载波系统上行链路的维护方法， 包括： 用户设备检测到所工作的部分分量载波上的上行同步定时器超时； 用 户设备向基站通知关于超时的信息， 或者用户设备去激活或删除部分分量载 波。 优选地， 用户设备检测到所工作的部分分量载波上的上行同步定时器超 时包括： 用户设备为所工作的各个分量载波维护独立的上行同步定时器， 用 户设备检测到各个分量载波中一个或多个分量载波上的上行同步定时器超 时； 或者用户设备按照时间提前量的不同将所工作的各个分量载波分成不同 的分量载波组， 为各个分量载波组维护独立的上行同步定时器， 用户设备检 测到一个或多个分量载波组的上行同步定时器超时。 优选地， 用户设备向基站通知关于超时的信息包括： 用户设备通过上行 同步定时器没有超时的分量载波来向基站通知关于超时的信息。 优选地， 用户设备向基站通知关于超时的信息包括： 用户设备通过媒体 接入控制单元向基站通知关于超时的信息。 优选地， 关于超时的信息包括： 表征部分分量载波的信息。 优选地， 在用户设备向基站通知关于超时的信息之后， 方法还包括： 用 户设备接收来自基站的命令消息， 其中， 命令消息用于指示对部分分量载波 进行去激活或删除。 优选地， 在用户设备向基站通知关于超时的信息之后， 方法还包括： 用 户设备接收来自基站的命令消息， 其中， 命令消息用于指示重新获取部分分 量载波的上行同步。 优选地， 在用户设备向基站通知关于超时的信息之后， 方法还包括： 用 户设备接收来自基站的命令消息， 其中， 命令消息用于指示重新在部分分量 载波上维护上行同步。 根据本发明的另一方面， 提供了一种用户设备， 包括： 检测模块， 检测 在所工作的部分分量载波上的上行同步定时器超时； 处理模块， 用于去激活 或删除部分分量载波。 根据本发明的另一方面， 提供了一种用户设备， 包括： 检测模块， 检测 在所工作的部分分量载波上的上行同步定时器超时； 发送模块， 用于向基站 通知关于超时的信息。 根据本发明的另一方面， 提供了一种多载波系统上行链路的维护系统， 包括： 用户设备， 在检测到所工作的部分分量载波上的上行同步定时器超时 的情况下向基站通知关于超时的信息或去激活或删除部分分量载波； 基站， 在接收到超时的信息的情况下， 向用户设备发送命令消息， 命令消息用于指 示对部分分量载波进行去激活或删除， 或者用于指示重新获取部分分量载波 的上行同步， 或者用于指示重新在部分分量载波上维护上行同步。 优选地， 用户设备通过上行同步定时器没有超时的分量载波来向基站通 知关于超时的信息。 通过本发明， 釆用用户设备检测到所工作的部分分量载波上的上行同步 定时器超时， 用户设备向基站通知关于超时的信息， 或者用户设备去激活或 删除部分分量载波， 解决了在多载波系统下对上行链路的维护可靠性和健壮 性较差的问题。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1是根据本发明实施例的载波聚合的覆盖的示意图； 图 2是根据本发明实施例的多载波系统上行链路的维护方法的流程图； 图 3是根据本发明实施例的各分量载波上分别进行上行链路维护的时序 示意图； 图 4是根据本发明实施例的各分量载波上分别维护上行链路的流程图； 图 5是根据本发明实施例的以 ΤΑ是否相同进行上行链路维护的时序示 意图； 图 6是根据本发明实施例的以 ΤΑ是否相同进行上行链路维护的流程图； 图 7是根据本发明实施例的用户设备的示意图； 图 8是根据本发明实施例的用户设备的示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。 图 1是根据本发明实施例的载波聚合的覆盖的示意图。 下面以频分双工模式（ Frequency Division Duplex, 简称为 FDD )为例来 进行描述。 如图 1所示，分量载波 1 (下行频点 fl , 上行频点 fl' ), 简称为 CC1 fl , UL fl ' ); 分量载波 2 (下行频点 f2, 上行频点 β' ), 简称为 CC2 ( DL Ϊ2, UL f2' ); 分量载波 3 (下行频点 β , 上行频点 β' ), 简称 CC3为 （ DL β , UL G' )可以进行载波聚合。 用户设备 UE驻留在 CC1上， UE当前没有建立 任何业务， 处于空闲态。 当 UE需要在多个分量载波上进行业务传输时， 本 发明中 UE和基站分别维护各分量载波上的上行链路同步。 如图 1所示， 才艮据本发明的另一种实施方式， 分量载波 1 , 分量载波 2, 分量载波 3可以进行载波聚合， 其中分量载波 1和分量载波 2的 ΤΑ相同， 分量载波 3与其他两个分量载波的 ΤΑ均不同。用户设备 UE驻留在 CC1上， UE当前没有建立任何业务， 处于空闲态。 当 UE需要在多个分量载波上进行 业务传输时， 本实施例中 UE和基站以 ΤΑ是否相同进行上行链路同步维护， 即 ΤΑ相同的多个 CC上统一维护上行链路同步， ΤΑ不同的 CC之间独立维 护上行链路同步。 才艮据本发明的实施例， 提供了一种多载波系统上行链路的维护方法。 图 2是根据本发明实施例的多载波系统上行链路的维护方法的流程图。 如图 2所示， 该方法包括如下步 4聚 S202至步 4聚 S204： 步骤 S202,用户设备检测到所工作的部分分量载波上的上行同步定时器 超时； 步骤 S204 , 用户设备向基站通知关于超时的信息， 或者用户设备去激活 或删除部分分量载波。 在本发明中， 用户设备检测到所工作的部分分量载波上的上行同步定时 器超时包括：用户设备为所工作的各个分量载波维护独立的上行同步定时器， 用户设备检测到一个或多个分量载波上的上行同步定时器超时； 或者用户设 备把所工作的各个分量载波以时间提前量（ ΤΑ )是否相同， 分成不同的分量 载波组， 为每一个分量载波组维护一个独立的上行同步定时器， 用户设备检 测到一个或多个分量载波组上的上行同步定时器超时。 其中， 用户设备向基站通知关于超时的信息可以包括： 用户设备通过上 行同步定时器没有超时的分量载波来向基站通知关于超时的信息。 其中， 用户设备向基站通知关于超时的信息可以包括： 用户设备通过媒 体接入控制单元向基站通知关于超时的信息。 其中， 上述关于超时的信息包括： 表征部分分量载波的信息。 在本发明中， 在用户设备向基站通知关于超时的信息之后， 该方法还可 以包括： 用户设备接收来自基站的命令消息， 其中， 命令消息用于指示对部 分分量载波进行去激活或删除。 其中，在用户设备向基站通知关于超时的信息之后，该方法还可以包括： 用户设备接收来自基站的命令消息， 其中， 命令消息用于指示重新获取部分 分量载波的上行同步。 其中，在用户设备向基站通知关于超时的信息之后，该方法还可以包括： 用户设备接收来自基站的命令消息， 其中， 命令消息用于指示重新在部分分 量载波上维护上行同步。 本发明中， 在基站新增一个或多个分量载波的情况下， 该方法还可以包 括： 用户设备判断新增的一个或多个分量载波的 TA是否与已工作的分量载 波的 TA相同； 在判断结果为是的情况下， 用户设备直接为新增的一个或多 个分量载波启动上行同步定时器； 在判断结果为否的情况下， 用户设备在新 增的一个或多个分量载波上进行随机接入。 图 3是根据本发明实施例的各分量载波上分别进行上行链路维护的时序 示意图； 图 4是根据本发明实施例的各分量载波上分别维护上行链路的流程 图。 如图 3和图 4所示， 本发明以频分双工模式为例， 其中， 分量载波 1、 分量载波 2和分量载波 3可以进行载波聚合。 用户设备 UE驻留在 CC1上， UE当前没有建立任何业务， 处于空闲态。 当 UE需要在多个分量载波上进行 业务传输时， 结合图 3 , 本实施例中 UE和基站分别维护各分量载波上的上 行链路同步， 具体流程如图 4所示， 该方法包括如下步骤： 步骤 S301 : UE首先在驻留分量载波 CC1获取与服务基站的上行同步。 即 UE在分量载波 CC1上进行随机接入， UE接收到服务基站反馈给 UE的 随机接入响应后， 启动 CC1上的上行同步定时器 TAT1 (如图 3所示 A点；)， 并根据随机接入响应中携带的时间提前量计算在 CC1 ( fl， )上的上行传输时 机 步骤 S302: UE维护分量载波 CC1上的上行同步。 即 UE在 TAT1运行 期间若接收到服务基站发送的 TA命令， 则重启 TAT 1 , 并使用 TA命令中携 带的时间提前量计算在 CC1 ( fl ' ) 上的上行传输时机； 如果 UE在 TAT1运 行期间没有接收到 TA命令， 则 TAT1超时时， UE认为与服务基站失去上行 同步。 步骤 S303 : UE获取新增分量载波 CC2上的上行同步。 月艮务基站才艮据业 务需要为 UE分配并激活新增分量载波 CC2,同时指示 CC2的 TA是否与 CC1 相同（本实施例假设相同）。 UE根据 CC2的 TA是否与 CC1相同， 获取 CC2 上的上行同步。 即如果 CC2的 TA与 CC1相同， 则 UE直接启动 CC2上的 上行同步定时器 TAT2 (如图 3所示 B点；)， 并直接才艮据 CC 1上最新的时间 提前量计算在 CC2 ( f2' )上的上行传输时机。 如果 CC2的 TA与 CC1不同， 则 UE在分量载波 CC2上进行随机接入， 当 UE接收到服务基站反馈给 UE 的随机接入响应后 ， 启动 TAT2, 并根据随机接入响应中携带的时间提前量 计算在 CC2 ( f2' ) 上的上行传输时机。 其中， TAT1和 TAT2的时长才艮据实际需要， 可以配置成相同， 也可以配 置成不同。 需要说明的是，在 UE获取新增分量载波 CC2上的上行同步的同时， UE 继续维护分量载波 CC1上的上行同步。 步骤 S304: UE和服务基站分别维护分量载波 CC1和 CC2上的上行同 步。 即服务基站分别在 CC1 ( fl ), CC2 ( f2 )上发送 TA命令； UE分别根据 CC1/CC2上发送的 TA命令， 重启 TAT1/TAT2。 其中， 在 TAT1运行期间， 若接收到服务基站在 CC1上发送的 TA命令， UE重启 TAT1 , 并使用 TA命令中携带的时间提前量计算在 CC1 ( fl ' )上的 上行传输时机； 同样在 TAT2运行期间， 若接收到服务基站在 CC2上发送的 TA命令， UE重启 TAT2, 并使用 TA命令中携带的时间提前量计算在 CC2 ( ί2' ) 上的上行传输时机。 服务基站可以在 ΤΑ命令中携带表征分量载波的信息， UE接收到 ΤΑ命 令后， 根据该信息确定是哪个分量载波上的 ΤΑ命令。 步骤 S305 : UE在 TATl运行期间没有接收到服务基站在 CC1上发送的 TA命令， 即 TAT1超时， 但此时 TAT2尚未超时（如图 3所示 C点；)， UE转 入维护上行链路的步骤 S306-1或步骤 S306-2。 步骤 S306-1 : UE继续在 CC2上进行正常的数据通信和链路维护 （如图 3所示 D点， UE接收到 CC2上发送的 TA命令， 重新启动 TAT2 ), UE通过 CC2通知月艮务基站 CC1 的上行链路情况， 具体通知方式可以是通过在 CC2 上发送特殊的上行 MAC CE ( Medium Access Control Elements, 媒体接入控 制单元；)， 该 MAC CE携带表征 CC1 ( fl' ) 的信息， 比如 CC1的频率信息， 或者服务基站在为 UE分配 CC1 时所分配的 CC1的标识信息 （或称索引信 息 ), 如本实施例中， 基站在为 UE分配 CC1和 CC2时分别为 CC1和 CC2 分配了两个标识信息， CC 1为标识 1 , CC2为标识 2 , 则该 MAC CE中携带 的表征 CC1 ( fl' )的信息即为标识 1。 该 MAC CE用于表示所指示的分量载 波上行链路失步， 或者说 TAT超时。 UE停止在 CC1上发送上行数据， 等待 服务基站的命令。 服务基站接收 UE上报的 CC1的上行链路情况后， 根据上行同步保持算 法， 资源调度算法， 下行信道质量等因素判断是 CC1上行失步了， 或者是因 为调度算法不合理导致长时间没有在 CC1 上发 TA命令， 或者是因为 CC1 下行信道太差导致 UE无法正确接收到 CC1发送的 TA命令等， 釆取不同的 动作。 比如如果 CC1 上行失步， 则服务基站根据业务需要可以指示 UE在 CC 1上进行随机接入以重新获取上行同步， 或者服务基站可以通知 UE去激 活 CC1 , 或者通知 UE直接删除 CC1的配置； 如果是因为调度算法不合理导 致长时间没有在 CC 1上发 TA命令， 则月艮务基站可以继续在 CC 1上调度 UE 或者向 UE发送新的 TA命令， UE接收到后启动 CC1上的 TAT1 , 重新维护 CC1的上行同步，并在 CC1上重新开始收发传输；如果是因为下行信道太差， 则月艮务基站可以通知 UE去激活 CC1 , 或者通知 UE直接删除 CC1的配置。 步骤 S306-2: UE继续在 CC2上进行正常的数据通信和链路维护 （如图 3所示 D点， UE接收到 CC2上发送的 TA命令， 重新启动 TAT2 ), UE去激 活 CC1 , 即 UE保存 CC1上的配置信息， 但不在 CC1上进行业务数据收发； 或者直接删除 CC1的配置。 服务基站根据上行同步保持算法， 或者调度机制， 相应的去激活 CC1或 者删除 CC1上的配置。 具体釆用去激活还是删除， 由 UE和服务基站事先约定， 或由协议规定。 釆用本发明该实施例所用的方法， 在载波聚合中， 各分量载波上独立维 护上行链路， 当部分分量载波上上行同步定时器超时时， UE通知服务基站， 或者去激活 /删除这些分量载波，并继续在上行同步的分量载波上保持正常通 信， 增强了上行链路维护的可靠性， 最终保证了数据传输的连续性， 从而为 用户设备提供良好的业务体验。 图 5是根据本发明实施例的以 TA是否相同进行上行链路维护的时序示 意图； 图 6是根据本发明实施例的以 TA是否相同进行上行链路维护的流程 图。 如图 5和图 6所示， 本发明实施例中的分量载波 1 , 分量载波 2, 分量 载波 3可以进行载波聚合， 其中分量载波 1和分量载波 2的 TA相同， 分量 载波 3与其他两个分量载波的 TA均不同。 用户设备 UE驻留在 CC1上， UE 当前没有建立任何业务， 处于空闲态。 当 UE需要在多个分量载波上进行业 务传输时， 结合图 5 , 本实施例中 UE和基站以 TA是否相同进行上行链路同 步维护， 即 TA相同的多个 CC上统一维护上行链路同步， TA不同的 CC之 间独立维护上行链路同步， 具体流程如图 6所示， 该方法包括如下步骤： 步骤 S501 : 方法同步 4聚 S301。 步骤 S502: 方法同步骤 S302。 步骤 S503:服务基站根据业务需要为 UE分配并激活新增分量载波 CC2, 同时指示 CC2的 TA与 CC1相同。 UE接收到该分配消息后， 判断 CC2的上 行同步与 CC1统一，即 UE统一维护 CC1和 CC2上的上行同步定时器 TAT1 , 并直接才艮据 CC1上最新的时间提前量计算在 CC2 ( β' )上的上行传输时机。 步骤 S504: UE和服务基站统一维护分量载波 CC1和 CC2上的上行同 步。 其中，服务基站可以根据不同的调度算法釆用不同的方式发送 ΤΑ命令。 如： 服务基站在 CC1和 CC2上同时发送 ΤΑ命令； 服务基站轮流或随机在 CCl , CC2发送 ΤΑ命令； 服务基站选择信道质量最好的 CC (如 CC1 )发送 ΤΑ命令； 服务基站首先选择在一个 CC上（如 CC1 )发送 ΤΑ命令， 服务基 站在该 CC上多次重传（比如 Ν次）该 ΤΑ命令后都没有接收到 UE的反馈， 则服务基站重新选择其他 CC (如 CC2 ) 发送 TA命令。
UE如果在 TAT1运行期间接收到 CC1或 CC2上的 TA命令，重启 TAT1 , 并使用 TA命令中携带的时间提前量计算在 CC1 ( fl，）、 CC2 ( fl，） 上的上 行传输时机。 如果在 TAT1运行期间， UE没有在 CC1或 CC2上接收到 TA 命令， 则 TAT1超时时， UE认为与服务基站失去上行同步。 步骤 S505 : UE获取新增分量载波 CC3上的上行同步。 月艮务基站才艮据业 务需要为 UE分配并激活新增分量载波 CC3 ,同时指示 CC3的 TA与 CC1/CC2 不同。 UE在分量载波 CC3上进行随机接入， 当 UE接收到服务基站反馈给 UE的随机接入响应后， 启动 TAT2 , 并根据随机接入响应中携带的时间提前 量计算在 CC3 ( β' ) 上的上行传输时机。 步骤 S506: UE和服务基站统一维护 CC1和 CC2上的上行同步， 独立 维护 CC3上的上行同步。 即服务基站釆用步骤 S504所述的可能方法在 CC1 或 CC2上发送 ΤΑ命令， 服务基站独立在 CC3上发送 ΤΑ命令； UE分别根 据 CC1或 CC2, CC3上的 ΤΑ命令， 重启 ΤΑΤ1/ΤΑΤ2。 步骤 S507: UE在 TAT1运行期间没有接收到服务基站在 CC1或 CC2上 发送的 ΤΑ命令， 即 TAT1超时， 但此时 ΤΑΤ2尚未超时 （图 5所示 D点；)。 此时 UE转入维护上行链路的步骤 S508-1或步骤 S508-2。 步骤 S508-1 : UE继续在 CC3上进行正常的数据通信和链路维护 （如图 5所示 E点， UE接收到 CC3上发送的 TA命令， 重新启动 TAT2 ), UE通过 CC3通知月艮务基站 CC1和 CC2的上行链路情况， 具体通知方式可以是通过 在 CC3 上发送特殊的上行媒体接入控制单元 （Medium Access Control Elements, 简称为 MAC CE ), 该 MAC CE携带表征 CC1 ( fl，） 和 /或 CC2 ( f2' ) 的信息， 比如 CC1和 /或 CC2的频率信息， 或者服务基站在为 UE分 配 CC1 , CC2 时所分配的标识信息 （或称索引信息）， 如本实施例中， 基站 在为 UE分配 CC1、 CC2和 CC3时分别为 CC1、 CC2和 CC3分配了三个标 识信息， CC1为标识 1 , CC2为标识 2, CC3为标识 3 , 则该 MAC CE中携 带的表征 CC1 ( fl，）和 /或 CC2 ( f2，）的信息即为标识 1和 /或标识 2。该 MAC CE用于表示所指示的分量载波上行链路失步， 或者说 TAT超时。 UE停止在 CC1和 CC2上发送上行数据， 等待服务基站的命令。 服务基站接收到 UE上报的上行链路情况后的处理同步骤 S306-1。 步骤 S508-2: UE继续在 CC3上进行正常的数据通信和链路维护 （如图 5所示 E点， UE接收到 CC3上发送的 TA命令， 重新启动 TAT2 ), UE去激 活 CC1和 CC2, 即 UE保存 CC1和 CC2上的配置信息， 但不在 CC1和 CC2 上进行业务数据收发； 或者直接删除 CC1和 CC2的配置。 其中， 服务基站根据上行同步保持算法， 或者调度机制， 相应的去激活
CC1和 CC2或者， J除 CC1和 CC2上 ό 己置。 具体釆用去激活还是删除， 由 UE和服务基站事先约定， 或由协议规定。 釆用本发明该实施例所用的方法， 在载波聚合中， TA相同的多个 CC上 (称为 CC组）统一维护上行链路同步， TA不同的 CC组之间独立维护上行 链路同步，当某个或多个 CC组（部分分量载波）的上行同步定时器超时， UE 通知服务基站， 或者去激活 /删除这些分量载波， 并继续在上行同步的分量载 波上保持正常通信， 增强了上行链路维护的可靠性， 最终保证了数据传输的 连续性， 从而为用户设备提供良好的业务体 -险。 根据本发明实施例， 提供了一种用户设备。 图 7是根据本发明实施例的 用户设备的示意图。 如图 7所示， 该用户设备包括： 检测模块 701和发送模 块 702。 其中， 检测模块 701 , 用于检测在所工作的部分分量载波上的上行同步 定时器超时； 发送模块 702 , 连接至检测模块 701 , 用于向基站通知关于超 时的信息。 图 8是根据本发明实施例的用户设备的示意图。 如图 8所示， 该用户设 备包括： 检测模块 801和处理模块 802。 其中， 检测模块 801 , 用于检测在所工作的部分分量载波上的上行同步 定时器超时； 处理模块 802 , 连接至检测模块 801 , 用于去激活或删除部分 分量载波。 才艮据本发明实施例， 提供了一种多载波系统上行链路的维护系统。 该多载波系统上行链路的维护系统包括： 用户设备， 用于在检测到所工 作的部分分量载波上上行同步定时器超时的情况下向基站通知关于超时的信 息或去激活或删除部分分量载波；基站， 用于在接收到超时的信息的情况下， 向用户设备发送命令消息， 命令消息用于指示对部分分量载波进行去激活或 删除， 或者用于指示重新获取部分分量载波的上行同步， 或者用于指示重新 在部分分量载波上维护上行同步。 优选地， 用户设备通过上行同步定时器没有超时的分量载波来向基站通 知关于超时的信息。 该多载波系统上行链路的维护系统部分分量载波的上行同步定时器超时 时， UE通知艮务基站， 或 UE去激活分量载波， 或 UE删除分量载波。 其中， 服务基站和 UE独立维护各分量载波上的上行链路， 当一个或者 几个分量载波的上行同步定时器超时， UE 通过上行同步定时器没有超时的 分量载波通知服务基站一个或者几个分量载波的上行链路状况。 服务基站接 收到 UE的通知后， 通知 UE重新获取一个或者几个分量载波上的上行同步， 或者通知 UE去激活一个或者几个分量载波， 或者通知 UE删除一个或几个 分量载波， 或者继续在一个或者几个分量载波上调度 UE。 本发明中， 服务基站和 UE独立维护各分量载波上的上行链路， 当一个 或者几个分量载波的上行同步定时器超时， UE 去激活一个或者几个分量载 波。 其中， 服务基站和 UE独立维护各分量载波上的上行链路， 当一个或者 几个分量载波的上行同步定时器超时， UE删除一个或者几个分量载波。 其中， 月艮务基站和 UE统一维护 TA相同的分量载波组的上行链路， 独 立维护各分量载波组的上行链路， 当一个或者几个分量载波组的上行同步定 时器超时， UE 通过上行同步定时器没有超时的分量载波组中的分量载波通 知月艮务基站一个或者几个分量载波组的上行链路状况。 服务基站和 UE统一维护 TA相同的分量载波组的上行链路， 独立维护 各分量载波组的上行链路， 当一个或者几个分量载波组的上行同步定时器超 时， UE去激活一个或者几个分量载波组或者删除一个或者几个分量载波组。 本发明中， 当服务基站新增一个或几个分量载波时， UE 获取新增分量 载波上的上行同步。 UE根据新增分量载波的 TA与已经工作的分量载波是否 相同， 如果相同， UE 直接为各个新增分量载波启动上行同步定时器； 如果 不同， UE在新增分量载波上进行随机接入。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并 且在某些情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种多载波系统上行链路的维护方法， 其特征在于， 包括：
用户设备检测到所工作的部分分量载波上的上行同步定时器超时； 所述用户设备向基站通知关于超时的信息， 或者所述用户设备去激 活或删除所述部分分量载波。
2. 根据权利要求 1所述的方法， 其特征在于， 用户设备检测到所工作的部 分分量载波上的上行同步定时器超时包括：
所述用户设备为所工作的各个分量载波维护独立的上行同步定时 器， 所述用户设备检测到所述各个分量载波中一个或多个分量载波上的 上行同步定时器超时； 或者
所述用户设备按照时间提前量的不同将所工作的各个分量载波分成 不同的分量载波组， 为各个分量载波组维护独立的上行同步定时器， 所 述用户设备检测到一个或多个分量载波组的上行同步定时器超时。
3. 根据权利要求 1所述的方法， 其特征在于， 所述用户设备向基站通知关 于超时的信息包括：
所述用户设备通过上行同步定时器没有超时的分量载波来向所述基 站通知所述关于超时的信息。
4. 根据权利要求 3所述的方法， 其特征在于， 所述用户设备向基站通知关 于超时的信息包括：
所述用户设备通过媒体接入控制单元向所述基站通知所述关于超时 的信息。
5. 根据权利要求 1所述的方法， 其特征在于， 所述关于超时的信息包括： 表征所述部分分量载波的信息。
6. 根据权利要求 1所述的方法， 其特征在于， 在所述用户设备向基站通知 关于超时的信息之后， 所述方法还包括：
所述用户设备接收来自所述基站的命令消息， 其中， 所述命令消息 用于指示对所述部分分量载波进行去激活或删除。 根据权利要求 1所述的方法， 其特征在于， 在所述用户设备向基站通知 关于超时的信息之后， 所述方法还包括：
所述用户设备接收来自所述基站的命令消息， 其中， 所述命令消息 用于指示重新获取所述部分分量载波的上行同步。 根据权利要求 1所述的方法， 其特征在于， 在所述用户设备向基站通知 关于超时的信息之后， 所述方法还包括：
所述用户设备接收来自所述基站的命令消息， 其中， 所述命令消息 用于指示重新在所述部分分量载波上维护上行同步。
一种用户设备, 其特征在于， 包括： 检测模块， 用于检测在所工作的部分分量载波上的上行同步定时 超时；
发送模块, 用于向基站通知关于超时的信息。 一种用户设备, 其特征在于， 包括： 检测模块 用于检测在所工作的部分分量载波上的上行同步定时 超时；
处理模块， 用于去激活或删除所述部分分量载波。
11. 一种多载波系统上行链路的维护系统， 其特征在于， 包括：
用户设备， 用于在检测到所工作的部分分量载波上的上行同步定时 器超时的情况下向基站通知关于超时的信息或去激活或删除所述部分分 量载波；
基站， 用于在接收到所述超时的信息的情况下， 向所述用户设备发 送命令消息， 所述命令消息用于指示对所述部分分量载波进行去激活或 删除， 或者用于指示重新获取所述部分分量载波的上行同步， 或者用于 指示重新在所述部分分量载波上维护上行同步。
12. 根据权利要求 11所述的系统， 其特征在于， 所述用户设备通过上行同步 定时器没有超时的分量载波来向所述基站通知所述关于超时的信息。
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