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WO2011026377A1 - Procédé et équipement utilisateur (eu) utilisés pour obtenir une commande d'avance temporelle (ta) - Google Patents

Procédé et équipement utilisateur (eu) utilisés pour obtenir une commande d'avance temporelle (ta) Download PDF

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Publication number
WO2011026377A1
WO2011026377A1 PCT/CN2010/074807 CN2010074807W WO2011026377A1 WO 2011026377 A1 WO2011026377 A1 WO 2011026377A1 CN 2010074807 W CN2010074807 W CN 2010074807W WO 2011026377 A1 WO2011026377 A1 WO 2011026377A1
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WO
WIPO (PCT)
Prior art keywords
component carrier
timing advance
new
user terminal
uplink
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2010/074807
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English (en)
Chinese (zh)
Inventor
朱鹏
郝鹏
喻斌
王瑜新
张戎
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ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of WO2011026377A1 publication Critical patent/WO2011026377A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method for acquiring timing advance and a user terminal.
  • the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system uses SC-FDMA (Single-Carrier Frequency Division Multiple Access) transmission technology to meet user terminals (User Equipment)
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • Uplink synchronization can be implemented by the base station controlling the UE to use different Timing Advance Command (TA), that is, the UE that is far away from the base station and has a large propagation delay is transmitted earlier, and is closer to the base station and has a propagation delay.
  • TA Timing Advance Command
  • the smaller UEs are sent later, so that the uplink signals of the respective UEs arrive at the base station receiving end substantially simultaneously.
  • the base station instructs the UE to use the appropriate timing advance TA by Medium Access Control (MAC) layer signaling.
  • MAC Medium Access Control
  • the UE may obtain a timing advance from a random access response of the base station by initiating random access (Random Access), or a MAC layer signaling timing advance amount MAC control unit (Tiing Advance Command) sent by the base station.
  • MAC control element Gets an update of the timing advance.
  • the timing advance in the random access response is 1 lbits, indicating a new uplink timing.
  • the timing advance in the Timing Advance Command MAC control element is 6 bits, indicating the adjustment of the current uplink timing.
  • the following describes the acquisition method of the timing advance amount in the random access response.
  • the user terminal establishes downlink time synchronization and frequency synchronization with the cell base station through cell search, and obtains downlink timing. Then, the system information (System Information) on the Physical Broadcast Channel (PBCH) and the Physical Downlink Shared Channel (PDSCH) is read.
  • System Information System Information
  • PBCH Physical Broadcast Channel
  • PDSCH Physical Downlink Shared Channel
  • the system information of the LTE system is divided into a Master Information Block (MIB). And a series of System Information Blocks (SIBs).
  • the main information block (MIB) contains some basic system information, including downlink system bandwidth, physical downlink HARQ (Hybrid Automatic Retransmission) indicator channel (PHICH) configuration information, system frame number, and so on.
  • the Master Information Block (MIB) is periodically transmitted on the Physical Broadcast Channel (PBCH).
  • System Information Blocks (SIBs) are classified into 11 categories (System Information Block Types 1-11) according to the content, and are transmitted on the physical downlink shared channel.
  • the SystemInformationBlockType2 (SIB-2) includes radio resource configuration information of the cell, including carrier frequency information of the uplink carrier, uplink system bandwidth, and random access configuration parameters.
  • the user terminal After completing downlink synchronization and acquiring system information, the user terminal initiates random access. Through random access, the user terminal establishes uplink time synchronization with the cell base station to obtain a timing advance. According to different ways of occupying resources, the random access process is further divided into contention based random access and non-contention based random access.
  • the contention-based random access process is divided into four steps:
  • the UE selects a physical random access channel (Physical Random Access Channel, PRACH for short) to send a random connection to the base station eNB (evolved Node B, evolved Node B) according to the random access configuration parameter in the system information block SIB-2.
  • the Random Access Preamble also known as Message 1 , abbreviated as Msg. 1).
  • the so-called contention-based random access that is, the random access preamble optional set configured by the base station is shared by multiple user terminals in the cell.
  • the base station After detecting the random access preamble, the base station calculates the timing advance by using the random access preamble sequence therein. As shown in Figure 2, the timing advance includes the uplink and downlink propagation delays. (ropagation delay) and multipath delay. The timing advance, along with some other signaling information, is sent over the physical downlink shared channel, called the random access response (also known as Message 2, abbreviated as Msg. 2).
  • Msg. 2 the random access response
  • the user terminal after receiving the random access response, the user terminal according to the timing advance amount corresponding to the random access preamble sent by the user in the random access response, on the basis of the start position of the downlink synchronized subframe, correspondingly in advance
  • the first scheduled UL transmission (also called Message 3, abbreviated as Msg. 3) is sent for a period of time.
  • Msg. 3 contains different information depending on the event that triggered the random access procedure.
  • multiple user terminals may select the same random access preamble from the shared random access preamble selective set and select the same random access channel.
  • the base station After receiving the Msg. 3, the base station also feeds the content resolution resolution (Contention Resolution, also known as Message 4, abbreviated as Msg. 4) to the user terminal to solve the possible conflict problem.
  • Contention Resolution also known as Message 4, abbreviated as Msg. 4
  • the non-contention based random access procedure can be divided into two steps, similar to the first two steps of the contention based random access procedure.
  • the user terminal selects the physical random access channel to send the random access preamble according to the random access configuration parameter in the system information block SIB-2 and the configuration of the high layer signaling.
  • the high layer signaling explicitly gives a dedicated random access preamble and a physical random access channel mask (PRACH Mask index).
  • PRACH Mask index physical random access channel mask
  • the user terminal selects a physical random access channel on a certain physical random access channel or a set of defined physical random access channels according to the mask, and sends a dedicated random access preamble.
  • the transmission timing of the random access preamble is the same as the contention based random access procedure, which is based on the downlink synchronization start position of the subframe (assuming the timing advance is 0).
  • the user terminal After confirming that the random access is successful, the user terminal can determine the uplink timing according to the downlink timing and the timing advance, and further send the uplink signal. In this way, although different user terminals may be located at different locations in the cell, the path propagation delay and the multipath delay are different, and the time when the uplink signal sent by the user terminal arrives at the receiving end of the base station is the same.
  • the base station passes the MAC layer letter. Update the transmission timing advance amount to the user terminal, for the current uplink Adjust it regularly to keep the uplink synchronized.
  • the uplink/downlink propagation delay and multipath delay on different component carriers may be the same or different.
  • the factors affecting include: the frequency spacing between component carriers. If the interval is large, even in different frequency bands, different component carriers.
  • the channel propagation characteristics may be different; and the transceiver position of the component carrier. If different component carriers use different antennas, and the spacing between antennas is large, the propagation delay and multipath delay may also be different.
  • the technical problem to be solved by the present invention is to provide a method for acquiring timing advance and a user terminal, which can be applied to a carrier aggregation system, so that the user terminal can acquire timing advances on different component carriers to maintain uplink synchronization.
  • the user terminal When the base station schedules the user terminal to send an uplink signal on a new component carrier, the user terminal sends, according to configuration information of a timing advance amount of each component carrier in the system information, and/or the base station sends
  • the indication of the timing advance amount determines whether a new timing advance amount needs to be acquired; if a new timing advance amount needs to be acquired, random access is initiated on the new component carrier to acquire a new timing advance amount.
  • the configuration information of the timing advance of each component carrier includes information about whether the component carriers of the cell use the same timing advance amount;
  • the user terminal determines that it is not necessary to acquire a new timing advance, and if the configuration information indicates that each component carrier of the cell uses a different timing advance, Then the user terminal determines that it is necessary to acquire a new timing advance amount;
  • the step of the user terminal transmitting an uplink signal on a new component carrier determining, on the new component carrier, an uplink timing by using a timing advance on a component carrier that is initially connected to the uplink synchronization, and transmitting the uplink Signaling; or determining, on the new component carrier, the uplink timing using the new timing advance and transmitting an uplink signal.
  • the user terminal transmitting an uplink signal on a new component carrier, determining, on the new component carrier, an uplink timing by using a timing advance of the component carrier group to which it belongs, and transmitting an uplink signal; or On the new component carrier, the uplink timing is determined by using the new timing advance, and an uplink signal is sent.
  • the user terminal initiates random access on the new component carrier to acquire new After the step of timing advance, the method further includes:
  • the component carrier group to which the new component carrier belongs is marked as uplink synchronization, and the acquired new timing advance amount is used as the timing advance amount of the component carrier group.
  • the indication information of the timing advance amount includes information indicating that the user terminal uses the obtained timing advance amount, or cannot use any one of the timing advance amounts that have been obtained;
  • the user terminal determines that it is not necessary to acquire a new timing advance amount, if the indication information indicates that the user terminal cannot use any one of the obtained timings In advance, the user terminal determines that random access needs to be initiated on the new component carrier to obtain a new timing advance;
  • the indication information of the timing advance amount is included in the radio resource control signaling that the base station schedules a new component carrier for the user terminal.
  • the user terminal determines whether it is necessary to acquire a new timing advance according to configuration information of a timing advance amount of each component carrier in the system information and/or indication information of a timing advance amount sent by the base station.
  • the system information includes the configuration information of the timing advance amount
  • the base station also sends the indication information of the timing advance amount
  • the user terminal preferentially according to the indication information of the timing advance amount. Decide if you need to get a new timing advance.
  • the base station indicates a dedicated random access preamble and a physical random access channel mask by scheduling radio resource control signaling of the new component carrier for the user terminal, where the user terminal is based on the random access preamble and physical randomness Accessing the channel mask, and combining the random access configuration parameters on the new component carrier, selecting a physical random access channel to send a dedicated random access preamble.
  • the step of the user terminal initiating random access on the new component carrier based on a new component carrier in a time division duplex mode, or based on a new uplink in a frequency division duplex mode Transmitting a random access preamble at a downlink start position of the downlink component of the downlink component carrier corresponding to the component carrier, and assuming that the timing advance is 0;
  • step of the user terminal transmitting an uplink signal on the new component carrier, determining an uplink timing according to a downlink timing of the new component carrier and the new timing advance amount.
  • the uplink timing is determined according to the downlink timing of the initial access and the new timing advance.
  • the user terminal is configured to: if the configuration information indicates use of each component carrier in the local cell If the same timing advance amount is determined, it is determined that it is not necessary to acquire a new timing advance quantity, and on the new component carrier, the uplink timing is determined by using the timing advance on the component carrier of the uplink synchronization that is initially accessed, and the uplink signal is sent;
  • the configuration information indicates that each component carrier of the cell uses a different timing advance quantity, and then determines that a new timing advance quantity needs to be acquired, and on the new component carrier, the new timing advance quantity is used to determine an uplink timing, and the uplink timing is determined. Uplink signal.
  • the configuration information of the timing advance of each component carrier includes configuration information of a component carrier group of the current cell, and component carriers that use the same timing advance amount belong to the same component carrier group; the user terminal is set to, according to The configuration information indicates that the component carrier group to which the initially accessed component carrier belongs is marked as uplink synchronization, and the acquired timing advance amount is used as the timing advance amount of the component carrier group; determining whether the new component carrier belongs to a component carrier group that has been uplink-synchronized, if the new component carrier belongs to a component carrier group that has been uplink-synchronized, the user terminal determines that it is not necessary to acquire a new timing advance amount, and uses the same on the new component carrier.
  • the timing advance of the component carrier group determines the uplink timing, and transmits an uplink signal; if the new component carrier does not belong to any one of the component carriers that have been uplink synchronized, the user terminal determines that it is necessary to acquire a new timing advance amount; Determining using the new timing advance on the new component carrier Horizontal timing, and transmits the uplink signal.
  • the user terminal is configured to preferentially indicate the information according to the timing advance amount when the system information includes the timing advance amount configuration information and the base station also sends the timing advance amount indication information. Decide if you need to get a new timing advance.
  • 1 is a schematic diagram of a contention-based random access procedure of an LTE system
  • FIG. 3 is a schematic diagram of carrier aggregation of an LTE-A system. Preferred embodiment of the invention
  • the method for obtaining the timing advance on different component carriers in the carrier aggregation system provided by the present invention may be as follows:
  • the base station carries configuration information of the timing advance amount of each component carrier in the system information, for example, whether the component timing carriers of the same cell use the same timing advance amount information.
  • the configuration information of the timing advance may be carried in a system information block SIB including cell radio resource configuration information or cell carrier aggregation configuration information, and the SIB is sent on a physical downlink shared channel.
  • SIB system information block
  • the system information is broadcast on all component carriers or partial component carriers; in the FDD mode, the system information is broadcast on all downlink component carriers or part of downlink component carriers.
  • the user terminal determines, according to the configuration information of the timing advance amount of each component carrier in the system information, whether to acquire a new timing advance amount, if necessary, Random access is initiated on the new component carrier.
  • the user terminal determines the uplink timing by using the timing advance on the component carrier of the uplink synchronization that is initially accessed, and then transmits the uplink signal.
  • the subscriber terminal needs to initiate random access on the new component carrier to obtain a new timing advance.
  • the user terminal determines the uplink timing on the new component carrier using a new timing advance, and then transmits the uplink signal.
  • the configuration of the timing advance may be carried in a system information block SIB including cell radio resource configuration information or cell carrier aggregation configuration information, and the SIB is transmitted on a physical downlink shared channel.
  • SIB system information block
  • the component carrier refers to a component carrier in TDD mode, or an uplink component carrier in FDD mode.
  • the system information is broadcast on all component carriers or partial component carriers; in the FDD mode, the system information is broadcast on all downlink component carriers or part of downlink component carriers.
  • the user terminal obtains a timing advance amount through initial access, and reads system information broadcasted by the base station, where the system information includes information on which component carriers of the cell use the same timing advance amount.
  • the user terminal transmits an uplink signal according to the uplink timing determined by the timing advance on the component carrier that has been uplink synchronized.
  • the user terminal marks the component carrier group to which the uplink-synchronized component carrier belongs as uplink synchronization according to the configuration information of the component carrier group, and uses the obtained timing advance amount as the timing advance amount of the component carrier group.
  • the user terminal determines the new component carrier according to the configuration information of the timing advance amount of each component carrier in the system information, that is, the configuration information of the component carrier group. Whether it belongs to a certain component carrier group that has been uplink synchronized, and determines whether random access needs to be initiated on the new component carrier.
  • the user terminal does not need to initiate random access on the new component carrier.
  • the user terminal uses the new component carrier
  • the timing advance of the component carrier group determines the uplink timing, and further transmits an uplink signal.
  • the user terminal needs to initiate random access on the new component carrier to obtain a new timing advance. After the random access procedure is completed, according to the configuration information of the component carrier group, the component carrier group to which the component carrier belongs is marked as uplink synchronization, and the obtained new timing advance amount is used as the timing advance amount of the component carrier group. The user terminal determines the uplink timing on the new component carrier using a new timing advance, and then transmits the uplink signal.
  • the user terminal sends an uplink signal according to the uplink timing determined by the timing advance.
  • the base station When the base station schedules the user terminal to transmit an uplink signal on a new component carrier, it instructs the user terminal to use a certain timing advance amount that the user terminal has obtained, or cannot use any timing advance amount that has been obtained.
  • the user terminal determines, according to the indication information, that no random access needs to be initiated on the new component carrier; and the user terminal uses the indication on the new component carrier.
  • the timing advance amount indicated by the information determines the uplink timing, and further transmits an uplink signal.
  • the user terminal needs to initiate random access on the new component carrier according to the indication information to obtain a new timing advance.
  • the user terminal determines the uplink timing on the new component carrier using the new timing advance, and then transmits the uplink signal.
  • the foregoing indication information may be used by the base station to schedule a new component carrier RRC (Radio)
  • method (1) and method (2) are cell-specific, and method (3) is based on user-terminal (UE-specific).
  • method (a) and method (c), or The method (2) and the method (3) may be used together, and for a certain component carrier, the indication information based on the timing advance amount of the user terminal has a higher priority than the configuration information of the timing advance amount based on the cell.
  • the user terminal may use the contention based or based on Non-competitive random access method.
  • the base station indicates the dedicated random access preamble and the physical random access channel mask (PRACH Mask index) by scheduling the RRC signaling of the new component carrier to the user terminal. .
  • PRACH Mask index the physical random access channel mask
  • the user terminal may send a random access preamble based on the subframe start position of the downlink carrier (FDD mode) downlink synchronization corresponding to the component carrier (TDD mode) or the uplink component carrier (assuming timing advance) The amount is 0).
  • the user terminal determines the uplink timing on each component carrier according to the respective downlink timing and timing advance on each new component carrier, and then transmits the uplink signal on each component carrier.
  • Embodiment 1 Assume that a carrier-aggregated LTE-A system operates in TDD mode with five component carriers CC 1 ⁇ 5.
  • the base station uses 1 bit (the bit is 1) in the system information of each component carrier to indicate that each component carrier of the cell uses a different timing advance.
  • the user terminal When the user terminal initially accesses, it performs downlink synchronization and random access on CC1, obtains downlink (DL) timing (1), and timing advance TA1, and reads system information on CC1, including system information. 1-bit configuration information of the timing advance of each component carrier.
  • the user terminal transmits an uplink signal on the component carrier CC1 that has been uplinked, according to the uplink timing determined by the downlink timing DL timing1 and the timing advance TA1.
  • the user terminal first performs downlink synchronization on CC3, obtains downlink timing DL timin g 3 , and reads system information on CC3. Then, according to the random access configuration parameter in the system information, a contention-based random access procedure is initiated on CC3, and a new timing advance TA3 is obtained.
  • the user terminal determines the uplink timing according to the downlink timing DL timin g 3 and the new timing advance TA3 on the new component carrier, and then transmits the uplink signal.
  • a carrier-aggregated LTE-A system operates in FDD mode with two downlink component carriers D1 and D2 and two uplink component carriers U1 and U2.
  • the base station uses 1 bit (the bit is 0) in the system information of D1, D2 (or only D1) to indicate that each component carrier of the cell uses the same timing advance.
  • the user terminal first performs downlink synchronization and random access on D1 and U1, obtains downlink timing DL timingl, and timing advance TA1, and reads system information on D1, including 1 bit configuration information of timing advance of each component carrier in the system information.
  • the user terminal transmits an uplink signal according to the uplink timing determined by the downlink timing DL timing1 and the timing advance TA1 on the U1 that has been uplink synchronized.
  • the user terminal determines that the random access is not required to be initiated on the U2 according to the configuration information of the timing advance of each component carrier in the system information.
  • the user terminal transmits an uplink signal on U2 according to the uplink timing determined by the downlink timing DL timing2 and the timing advance TA1.
  • a carrier-aggregated LTE-A system operates in TDD mode with four component carriers CC 0 ⁇ 3.
  • CC0 and CC1 have the same timing advance amount, which is component carrier group 0;
  • CC2 and CC3 have the same timing advance amount, which is component carrier group 1.
  • the base station indicates in the system information of each component carrier which component carriers of the cell use the same timing advance.
  • CC0 and CC1 may be indicated as component carrier group 0 in the cell radio resource configuration information or the cell carrier aggregation configuration information;
  • CC2 and CC3 are component carrier group 1.
  • the downlink synchronization and random access are completed on the CC3
  • the downlink timing DL timing3 is obtained
  • a timing advance amount TA3 is obtained
  • the system information on the CC3 is read, including the component carriers in the system information.
  • the configuration information of the timing advance amount that is, the configuration information of the component carrier group.
  • the user terminal is on the CC3 that has been uplink synchronized, according to the downlink timing DL timin g 3 , and timing The uplink timing determined by the preamble TA3 transmits an uplink signal.
  • the user terminal determines, according to the configuration information of the component carrier group, that the CC2 belongs to the component carrier group 1 that has been uplinked, and determines that the random access is not required to be initiated on the CC2.
  • the user terminal first completes downlink synchronization on CC2, obtains downlink timing DL timin g 2, and reads
  • the user terminal transmits an uplink signal on the CC2 according to the uplink timing determined by the downlink timing DL timin g 2 and the timing advance TA3.
  • CC3 and CC2 are strictly time-frequency synchronized, and the user terminal transmits an uplink signal on CC2 according to the uplink timing determined by the downlink timing DL timin g 3 on CC3 and the timing advance TA3 on CC3.
  • the user terminal first completes downlink synchronization on CC0, obtains downlink timing DL timingO, and reads
  • the base station when the base station schedules CC0 to the user terminal, the base station configures a dedicated random access preamble and a physical random access channel mask (PRACH Mask index) in the RRC signaling.
  • PRACH Mask index a physical random access channel mask
  • the user terminal initiates a non-contention based random access procedure on CC0 in conjunction with the random access configuration parameters on CC0, and obtains a new timing advance TA0.
  • the user terminal marks the component carrier group 0 to which the uplink synchronization CC0 belongs as uplink synchronization according to the configuration information of the component carrier group, and uses the obtained timing advance TA0 as the timing advance of the component carrier group.
  • the user terminal transmits an uplink signal on CC0 according to the uplink timing determined by the downlink timing DL timingO and the timing advance TA0.
  • Embodiment 4 Assume that a carrier-aggregated LTE-A system operates in FDD mode with three downlink component carriers D0, D1, and D2, and three uplink component carriers U0, U1, and U2.
  • the user terminal first performs downlink synchronization and random access on D1 and U1, obtains downlink timing DL timing1, and timing advance TA1, and reads system information on D1.
  • the base station schedules the user terminal to send an uplink signal on U2
  • the RRC signaling indicates that the user terminal cannot use any timing advance amount that the user terminal has obtained on U2.
  • the user terminal needs to initiate random access on U2.
  • the user terminal first performs downlink synchronization on D2, obtains DL timin g 2, and reads system information on D2. Then, according to the random access configuration parameter in the system information, a contention-based random access procedure is initiated on U2, and a new timing advance amount TA2 is obtained.
  • the base station when the base station schedules U2 to the user terminal, the base station configures a dedicated random access preamble and a physical random access channel mask (PRACH Mask index) in the RRC signaling.
  • PRACH Mask index a physical random access channel mask
  • the user terminal initiates a non-contention based random access procedure on U2 in conjunction with the random access configuration parameters on D2, and obtains a new timing advance TA2.
  • the user terminal determines the uplink timing and transmits the uplink signal according to the downlink timing DL timing2 and the timing advance TA2 on U2.
  • the RRC signaling indicates that the user terminal uses the timing advance TA1 that the user terminal has obtained on U0.
  • the user terminal does not need to initiate random access on U0.
  • the user terminal is on U0, according to the downlink timing DL timingO, and the timing advance indicated by the signaling.
  • D1 and DO are strictly time-frequency synchronized, and the user terminal determines the uplink timing according to the downlink timing DL timing1 on D1 and the TA1 indicated by the signaling on U0, and transmits an uplink signal.
  • Embodiment 5 is strictly time-frequency synchronized, and the user terminal determines the uplink timing according to the downlink timing DL timing1 on D1 and the TA1 indicated by the signaling on U0, and transmits an uplink signal.
  • a carrier-aggregated LTE-A system operates in TDD mode with five component carriers CC 0 ⁇ 4.
  • CC0 and CC1 have the same timing advance amount, which is component carrier group 0;
  • CC2 is component carrier group 1;
  • CC3 and CC4 have the same timing advance amount, which is component carrier group 2.
  • the base station indicates in the system information of each component carrier which component carriers of the cell use the same timing advance. Specifically, CC0 and CC1 are indicated as component carrier group 0 in the cell radio resource configuration information or cell carrier aggregation configuration information; CC2 is component carrier group 1; CC3 and CC4 are component carrier group 2.
  • the user equipment When the user equipment initially accesses, it performs downlink synchronization and random access on CC0, obtains downlink timing DL timingO, and a timing advance TAO, and reads system information on the CCO, including component carriers in the system information.
  • the configuration information of the timing advance amount that is, the configuration information of the component carrier group.
  • the user terminal marks the component carrier group 0 to which the uplink synchronization CC0 belongs as uplink synchronization according to the configuration information of the component carrier group, and uses the obtained timing advance TA0 as the timing advance of the component carrier group.
  • the user terminal determines, according to the configuration information of the component carrier group, that CC1 belongs to the component carrier group 0 that has been uplinked, and determines that random access is not required to be initiated on CC1.
  • the user terminal first performs downlink synchronization on CC1, obtains downlink timing DL timingl, and reads system information on CC1.
  • the user terminal determines the uplink timing and transmits the uplink signal according to the downlink timing DL timing1 and the timing advance TA0 on CC1.
  • the user terminal determines the uplink timing and sends the uplink signal according to the downlink timing DL timingO on CC0 and the timing advance TA0 on CC0 on CC1.
  • the user terminal determines, according to the configuration information of the component carrier group, that the CC2 does not belong to the component carrier group 0 that has been uplinked, and determines that it is required. Random access is initiated on CC3.
  • the user terminal first performs downlink synchronization on CC2, obtains downlink timing DL timin g 2, and reads system information on CC2. Then, according to the random access configuration parameter in the system information, a contention-based random access procedure is initiated on CC2, and a new timing advance TA2 is obtained.
  • the base station configures a dedicated random access preamble and a physical random access channel mask (PRACH Mask index) in the RRC signaling when scheduling the CC2 to the user terminal.
  • PRACH Mask index a physical random access channel mask
  • the user terminal initiates a non-contention based random access procedure on CC2 in conjunction with the random access configuration parameters on CC2, and obtains a new timing advance TA2.
  • the user terminal determines the uplink timing according to the downlink timing DL timin g 2 and the timing advance amount TA2 on the CC2, and transmits an uplink signal.
  • the user terminal determines, according to the configuration information of the component carrier group, that the CC3 does not belong to the uplink-synchronized component carrier group 0 or the component carrier group 1, and determines that a randomization needs to be initiated on the CC3. Access.
  • the user terminal first performs downlink synchronization on CC3, obtains downlink timing DL timin g 3 , and reads system information on CC3. Then, according to the random access configuration parameter in the system information, a contention-based random access procedure is initiated on CC3, and a new timing advance TA3 is obtained.
  • the base station configures a dedicated random access preamble and a physical random access channel mask (PRACH Mask index) in the RRC signaling when scheduling the CC3 to the user terminal.
  • PRACH Mask index a physical random access channel mask
  • the user terminal initiates a non-contention based random access procedure on CC3 in conjunction with the random access configuration parameters on CC3, and obtains a new timing advance TA3.
  • the user terminal marks the component carrier group 2 to which the uplink synchronization CC3 belongs as uplink synchronization according to the configuration information of the component carrier group, and uses the obtained timing advance amount TA3 as the timing advance amount of the component carrier group.
  • the user terminal determines the uplink timing according to the downlink timing DL timin g 3 and the timing advance amount TA3 on the CC3, and transmits an uplink signal.
  • the base station schedules the user terminal to send an uplink signal on the CC4, it uses the RRC signaling indication.
  • the subscriber terminal cannot use any timing advance (TA0, TA2, or TA3) that the user terminal has obtained on CC4.
  • the user terminal needs to initiate random access on CC4.
  • the user terminal first performs downlink synchronization on CC4, obtains downlink timing DL timin g 4, and reads system information on CC4. Then, according to the random access configuration parameter in the system information, a contention-based random access procedure is initiated on CC4, and a new timing advance amount TA4 is obtained.
  • the base station configures a dedicated random access preamble and a physical random access channel mask (PRACH Mask index) in the RRC signaling when scheduling the CC4 to the user terminal.
  • PRACH Mask index a physical random access channel mask
  • the user terminal initiates a non-contention based random access procedure on CC4 in conjunction with the random access configuration parameters on CC4, and obtains a new timing advance TA4.
  • the user terminal determines the uplink timing according to the downlink timing DL timin g 4 and the timing advance amount TA4 on the CC4, and transmits an uplink signal.
  • the base station uses 1 bit (the bit is 1) in the system information of each component carrier to indicate that each component carrier of the cell uses a different timing advance.
  • the downlink synchronization and random access are completed on the CC1, the downlink timing DL timing1, and the timing advance amount TAl are obtained, and the system information on the CCl is read, including the timing advance of each component carrier in the system information.
  • the amount of lbit configuration information is obtained.
  • the user terminal determines the uplink timing and transmits the uplink signal according to the downlink timing DL timing1 and the timing advance amount TA1 on the CC1 that has been uplink synchronized.
  • the base station schedules the user terminal to send an uplink signal on the CC3
  • the user terminal determines that a random access needs to be initiated on the CC3 according to the system information.
  • the user terminal determines the uplink timing and transmits the uplink signal according to the downlink timing DL timing1 at the initial access and the timing advance amount TA3 on the CC3.
  • the present invention also discloses a user terminal, the user terminal is configured to acquire a timing advance by initial access, and read system information broadcast by the base station; after receiving the scheduling signal of the base station, according to the system information
  • the configuration information of the timing advance amount of each component carrier and/or the indication information of the timing advance amount transmitted by the base station determines whether it is necessary to acquire a new timing advance amount; if it is necessary to acquire a new timing advance amount, the new A random access is initiated on the component carrier to acquire a new timing advance; and an uplink signal is transmitted on a new component carrier.
  • the user terminal is configured to: if the configuration information indicates that each component carrier of the cell uses the same timing advance amount, determine that it is not necessary to acquire a new timing advance, and use the initial access station on the new component carrier.
  • the timing advance on the component carrier of the uplink synchronization determines the uplink timing, and sends an uplink signal; if the configuration information indicates that each component carrier of the local cell uses a different timing advance amount, it is determined that a new timing advance amount needs to be acquired, where On the new component carrier, the new timing advance is used to determine the uplink timing and the uplink signal is transmitted.
  • the configuration information of the timing advance of each component carrier includes configuration information of a component carrier group of the current cell, and the component carriers that use the same timing advance amount belong to the same component carrier group; the user terminal is set to, according to the The configuration information indicates that the component carrier group to which the initially accessed component carrier belongs is marked as uplink synchronization, and the acquired timing advance amount is used as the timing advance amount of the component carrier group; determining whether the new component carrier belongs to An uplink-synchronized component carrier group, if the new component carrier belongs to an uplink-synchronized component carrier group, the user terminal determines that it is not necessary to acquire a new timing advance amount, and uses the associated component on the new component carrier
  • the timing advance of the component carrier group determines an uplink timing, and transmits an uplink signal; if the new component carrier does not belong to any one of the component carriers that have been uplink synchronized, the user terminal determines that a new timing advance is required to be acquired; Determining on the new component carrier using the new timing advance Line timing and send an upstream signal
  • the user terminal is configured to include, in the system information, the timing advance amount
  • the configuration information and the base station also transmit the indication information of the timing advance amount, it is preferred to determine whether it is necessary to acquire a new timing advance amount according to the indication information of the timing advance amount.
  • the functions of the user terminal are the same as those of the user terminal in the method embodiment, and are not described herein.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un équipement utilisateur (EU) utilisés pour obtenir une commande d'avance temporelle (TA). Le procédé s'applique au système d'agrégation de porteuses et comprend les étapes suivantes : l'EU obtient une TA via un accès initial et lit les informations système (SI) diffusées par un site de cellule; quand l'EU est programmé par une station de base (BS) pour transmettre un signal de liaison montante sur une nouvelle composante porteuse, l'EU détermine s'il est nécessaire d'obtenir une nouvelle TA en se basant sur les informations de configuration de la TA de chaque composante porteuse dans les SI et/ou sur les informations d'indication de la TA transmises par la BS; le cas échéant, l'EU initie ensuite un accès aléatoire sur la nouvelle composante porteuse de sorte à obtenir une nouvelle TA. Le procédé selon l'invention permet de réaliser une configuration flexible qui adopte la même TA ou des TA différentes sur différentes composantes porteuses qui sont basées sur des cellules ou des UE. Le procédé permet en outre de réduire le coût d'établissement et de maintien de la synchronisation sur la liaison montante (pour l'accès aléatoire, par exemple).
PCT/CN2010/074807 2009-09-01 2010-06-30 Procédé et équipement utilisateur (eu) utilisés pour obtenir une commande d'avance temporelle (ta) Ceased WO2011026377A1 (fr)

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WO2015018371A1 (fr) * 2013-08-08 2015-02-12 Telefonaktiebolaget L M Ericsson (Publ) Procédés et dispositifs d'accès aléatoire
US20230083477A1 (en) * 2016-03-31 2023-03-16 Telefonaktiebolaget Lm Ericsson (Publ) Application of Timing Advance Command in Wireless Communication Device in Enhanced Coverage Mode

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