WO2011026377A1 - Method and user equipment (ue) for obtaining timing advance command (ta) - Google Patents
Method and user equipment (ue) for obtaining timing advance command (ta) Download PDFInfo
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- 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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- component carrier
- timing advance
- new
- user terminal
- uplink
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 239000000969 carrier Substances 0.000 claims abstract description 52
- 230000002776 aggregation Effects 0.000 claims abstract description 15
- 238000004220 aggregation Methods 0.000 claims abstract description 15
- 230000011664 signaling Effects 0.000 claims description 27
- 230000001360 synchronised effect Effects 0.000 claims description 21
- 230000000977 initiatory effect Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036963 noncompetitive effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- 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
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- 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), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- 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
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- 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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Abstract
A method and a User Equipment (UE) for obtaining a Timing Advance Command (TA) are disclosed. The method is applied in the system of Carrier Aggregation and includes: the UE obtains a TA through an initial access and reads the System Information (SI) broadcasted by a cell site; when the UE is scheduled by a Base Station (BS) to transmit an uplink signal on a new Component Carrier, the UE decides whether it is required to obtain a new TA according to the configuration information of the TA of each Component Carrier in the SI and/or the indication information of the TA transmitted by the BS; if required, the UE then initiates a random access on the new Component Carrier to obtain a new TA. Through the method, the flexible configuration which adopts the same or different TAs on different Component Carriers which are based on cells or UEs can be realized, and the cost for establishing and maintaining uplink synchronization such as random access can be reduced as well.
Description
一种定时提前量的获取方法和用户终端 Method for acquiring timing advance amount and user terminal
技术领域 Technical field
本发明涉及移动通信领域, 特别涉及一种定时提前量的获取方法和用户 终端。 The present invention relates to the field of mobile communications, and in particular, to a method for acquiring timing advance and a user terminal.
背景技术 Background technique
第三代合作伙伴计划 ( The 3rd Generation Partnership Project, 3 GPP )长 期演进( Long Term Evolution, LTE ) 系统上行釆用 SC-FDMA (单载波频分 多址)传输技术, 为了满足用户终端 (User Equipment, 简称 UE )上行信号 之间的正交性, 必须保证各 UE上行信号到达基站接收端的时间一致, 即上 行同步。 上行同步可以通过基站控制 UE 釆用不同的定时提前量 (Timing Advance Command, 简称 TA ) 来实现, 即距离基站较远、 传播时延较大的 UE较早发送, 距离基站较近、 传播时延较小的 UE较晚发送, 从而使各个 UE 的上行信号基本同时到达基站接收端。 基站通过媒体接入控制 (MAC ) 层信令指示 UE釆用适当的定时提前量 TA。 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) For example, the orthogonality between the uplink signals of the UE must ensure that the uplink signals of the UEs arrive at the receiving end of the base station at the same time, that is, uplink synchronization. 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. 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.
UE可以通过发起随机接入(Random Access ) , 从基站的随机接入响应 ( Random Access Response )中获得定时提前量;也可以通过基站发送的 MAC 层信令定时提前量 MAC控制单元 ( Timing Advance Command MAC control element ) 获得定时提前量的更新。 其中, 随机接入响应中的定时提前量为 1 lbits , 指示新的上行定时 ( uplink timing ); Timing Advance Command MAC control element中的定时提前量为 6bits , 指示对当前上行定时的调整。 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.
以下说明随机接入响应中定时提前量的获取方法。 The following describes the acquisition method of the timing advance amount in the random access response.
首先,用户终端通过小区搜索与小区基站建立下行时间同步和频率同步, 获得下行定时( downlink timing )。然后,读取物理广播信道( Physical Broadcast Channel,简称 PBCH )和物理下行共享信道( Physical Downlink Shared Channel, 简称 PDSCH )上的系统信息 ( System Information ) 。 First, 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.
LTE系统的系统信息分为主信息块( Master Information Block,简称 MIB )
和一系列系统信息块 ( System Information Blocks, 简称 SIBs ) 。 其中, 主信 息块( MIB )包含一些最基本的系统信息,包括下行系统带宽、物理下行 HARQ (混合自动重传)指示信道(PHICH ) 的配置信息、 系统帧号等。 主信息块 ( MIB )在物理广播信道(PBCH )上周期发送。 系统信息块(SIBs )根据内 容分为 11类 (系统信息块类型 ( SystemlnformationBlockType ) 1-11 ) , 并 在物理下行共享信道上发送。 其中, SystemInformationBlockType2 ( SIB-2 ) 包含了该小区的无线资源配置信息 ( Radio Resource Configuration Information ) , 其中包括上行载波的载频信息、 上行系统带宽, 以及随机接入 配置参数。 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.
完成下行同步和获取系统信息之后, 用户终端发起随机接入。 通过随机 接入, 用户终端与小区基站建立上行时间同步, 获得定时提前量。 根据占用 资源方式的不同, 随机接入过程又分为基于竟争的 ( contention based ) 随机 接入和基于非竟争的 ( non-contention based ) 随机接入。 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.
如图 1所示, 基于竟争的随机接入过程分为四步: As shown in Figure 1, the contention-based random access process is divided into four steps:
( 1 ) UE根据系统信息块 SIB-2中的随机接入配置参数, 选择物理随机 接入信道( Physical Random Access Channel,简称 PRACH )向基站 eNB( evolved Node B, 演进的节点 B )发送随机接入前导( Random Access Preamble, 又称 为 Message 1 , 简写为 Msg. 1 ) 。 (1) 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).
所谓基于竟争的随机接入, 即基站配置的随机接入前导可选集是小区内 多个用户终端共享的。 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.
随机接入前导基于下行同步的子帧( subframe )位置发送(此时假设定时 提前量为 0 )。具体说,对于频分双工( Frequency Division Duplex, 简称 FDD ) 模式, 随机接入前导在下行同步的子帧起始位置开始发送; 对于时分双工 ( Time Division Duplex, 简称 TDD )模式, 随机接入前导格式 0~3 ( reamble format 0~3 ) 在下行同步的子帧起始位置开始发送, 随机接入前导格式 4 ( reamble format 4 )在下行同步的时隙 UpPTS (上行导频时隙)的结束位置 前 5158个 Ts开始发送。 其中, Ts=l/(15000 x 2048)秒。 The random access preamble is transmitted based on the subframe synchronization (subframe) position (assuming that the timing advance is 0). Specifically, for the Frequency Division Duplex (FDD) mode, the random access preamble starts to be transmitted at the start position of the downlink synchronization subframe; for the Time Division Duplex (TDD) mode, the random access The preamble format 0~3 (reamble format 0~3) starts to be transmitted at the start position of the downlink synchronization subframe, and the random access preamble format 4 (reamble format 4) is in the downlink synchronization time slot UpPTS (uplink pilot time slot). The end of the 5158 Ts starts to send. Where Ts = l / (15000 x 2048) seconds.
( 2 )基站检测到随机接入前导后, 利用其中的随机接入前导序列, 计算 定时提前量。 如图 2 所示, 定时提前量包括了上行和下行链路的传播时延
( ropagation delay ) 以及多径时延 ( multipath delay ) 。 定时提前量连同其他 一些信令信息,经物理下行共享信道发送,称为随机接入响应(又称为 Message 2, 简写为 Msg. 2 ) 。 (2) 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).
( 3 )用户终端在收到随机接入响应后, 按照随机接入响应中对应于其发 送的随机接入前导的定时提前量, 在下行同步的子帧起始位置的基础上, 提 前相应的一段时间发送首次调度上行传输 ( First scheduled UL transmission, 又称为 Message 3 , 简写为 Msg. 3 ) 。 Msg. 3根据触发该随机接入过程的事 件不同而包含有不同的信息。 (3) 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.
( 4 )如前所述, 对基于竟争的随机接入过程, 多个用户终端可能从共用 的随机接入前导可选集中选择相同的随机接入前导, 并选择了相同的随机接 入信道。 基站收到 Msg. 3 后还要按其内容反馈竟争解决消息 (Contention Resolution, 又称为 Message 4, 简写为 Msg. 4 )给用户终端, 以解决可能出 现的冲突问题。 (4) As described above, for a contention-based 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. . 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.
基于非竟争的随机接入过程则可分为两步, 类似于基于竟争的随机接入 过程的前两步。 但在第 (1 )步中, 用户终端根据系统信息块 SIB-2中的随机 接入配置参数, 以及高层信令的配置, 选择物理随机接入信道发送随机接入 前导。 具体说, 高层信令显式地给出一个专用的随机接入前导, 以及一个物 理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端根据该掩码, 在一个 确定的物理随机接入信道上, 或在一组限定的物理随机接入信道中选择一个 物理随机接入信道, 发送专用的随机接入前导。 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. However, in the step (1), 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. Specifically, the high layer signaling explicitly gives a dedicated random access preamble and a physical random access channel mask (PRACH Mask index). 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.
随机接入前导的发送时序同基于竟争的随机接入过程一样, 是基于下行 同步的子帧起始位置发送(假设定时提前量为 0 ) 。 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).
用户终端确认随机接入成功以后, 即可根据下行定时和定时提前量确定 上行定时, 进而发送上行信号。 这样, 尽管不同的用户终端可能位于小区中 的不同位置, 路径传播时延和多径时延各不相同, 用户终端发送的上行信号 到达基站接收端的时间却是一样的。 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.
随着用户终端的移动, 或者传播环境中散射体的移动, 用户终端同小区 基站间的距离发生变化, 传播环境发生变化, 传播时延和多径时延也随之变 化, 基站通过 MAC层信令发送定时提前量更新给用户终端, 对当前的上行
定时加以调整, 以保持上行同步。 As the user terminal moves or the scatterer moves in the propagation environment, the distance between the user terminal and the cell site changes, the propagation environment changes, and the propagation delay and multipath delay also change. 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.
高级长期演进系统( Long Term Evolution-Advanced , 简称 LTE-A系统) 是 LTE系统的下一代演进系统。如图 3所示, LTE-A系统釆用载波聚合( Carrier Aggregation, 又称载波聚集)技术扩展传输带宽, 以获得更高的数据速率。 每个聚合的载波称为一个 "分量载波" (Component Carrier )。 分量载波在频 谱上可以是连续的, 也可以是非连续的; 可以位于同一个频段(frequency band ) , 也可位于不同的频段。 The Long Term Evolution-Advanced (LTE-A system) is the next-generation evolution system of the LTE system. As shown in FIG. 3, the LTE-A system uses Carrier Aggregation (Carrier Aggregation) technology to extend the transmission bandwidth to obtain a higher data rate. Each aggregated carrier is called a "Component Carrier". The component carriers may be contiguous or non-contiguous in the spectrum; they may be in the same frequency band or in different frequency bands.
不同分量载波上的上 /下行传播时延和多径时延可能相同, 也可能不同, 影响的因素包括: 分量载波间的频率间隔, 如果间隔较大, 甚至位于不同的 频段, 不同分量载波的信道传播特性可能不一样; 以及分量载波的收发机位 置, 如果不同分量载波使用不同的天线, 且天线间间隔较大, 传播时延和多 径时延也可能不一样。 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.
因此, 在与现有技术的单一载波的系统不同的载波聚合系统中, 用户终 端如何获取不同分量载波上的定时提前量, 以保持上行同步, 并同时减小通 过随机接入建立上行同步的开销, 成为一个亟待解决的问题。 Therefore, in a carrier aggregation system different from the prior art single carrier system, how does the user terminal acquire the timing advance on different component carriers to maintain uplink synchronization and reduce the overhead of establishing uplink synchronization through random access; , become an urgent problem to be solved.
发明内容 Summary of the invention
本发明要解决的技术问题是提供一种定时提前量的获取方法和用户终 端, 可应用于载波聚合系统中, 使用户终端能够获取不同分量载波上的定时 提前量, 以保持上行同步。 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.
为了解决上述问题, 本发明提供了一种定时提前量的获取方法, 包括: 用户终端通过初始接入, 获取一个定时提前量, 并读取基站广播的系统 信息; In order to solve the above problem, the present invention provides a method for acquiring a timing advance amount, including: a user terminal acquires a timing advance amount through initial access, and reads system information broadcasted by the base station;
当所述基站调度所述用户终端在一个新的分量载波上发送上行信号时, 所述用户终端根据所述系统信息中的各分量载波的定时提前量的配置信息、 和 /或所述基站发送的定时提前量的指示信息, 决定是否需要获取新的定时提 前量; 如果需要获取新的定时提前量, 则在所述新的分量载波上发起随机接 入以获取新的定时提前量。
优选地, 所述各分量载波的定时提前量的配置信息包括本小区各分量载 波是否使用相同的定时提前量的信息; 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. Preferably, 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;
在所述用户终端根据所述配置信息决定是否需要获取新的定时提前量的 步骤中, In the step of determining, by the user terminal, whether it is necessary to acquire a new timing advance according to the configuration information,
如果所述配置信息指示本小区各分量载波使用相同的定时提前量, 则所 述用户终端判定无需获取新的定时提前量, 如果所述配置信息指示本小区各 分量载波使用不同的定时提前量, 则所述用户终端判定需要获取新的定时提 前量; If the configuration information indicates that each component carrier of the cell uses the same timing advance, 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;
在所述用户终端在一个新的分量载波上发送上行信号的步骤中, 在所述 新的分量载波上, 使用初始接入所上行同步的分量载波上的定时提前量确定 上行定时, 并发送上行信号; 或者在所述新的分量载波上, 使用所述新的定 时提前量确定上行定时, 并发送上行信号。 In 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.
优选地, 所述各分量载波的定时提前量的配置信息包括本小区分量载波 组的配置信息, 使用相同的定时提前量的分量载波属于同一个分量载波组; 在所述用户终端根据所述配置信息决定是否需要获取新的定时提前量的 步骤中, Preferably, the configuration information of the timing advance of each component carrier includes configuration information of a carrier group of the current cell, and component carriers that use the same timing advance belong to the same component carrier group; according to the configuration of the user terminal The information determines whether a step of acquiring a new timing advance is required,
所述用户终端根据所述配置信息, 将初始接入的分量载波所属的分量载 波组标记为已上行同步, 并将已获取的定时提前量作为该分量载波组的定时 提前量; And the user terminal marks, according to the configuration information, a component carrier group to which the initially accessed component carrier belongs as uplink synchronization, and uses the acquired timing advance amount as a timing advance amount of the component carrier group;
判断所述新的分量载波是否属于已上行同步的分量载波组, 如果所述新 的分量载波属于已上行同步的分量载波组, 则所述用户终端判定无需获取新 的定时提前量, 如果所述新的分量载波不属于已上行同步的任何一个分量载 波组, 则所述用户终端判定需要获取新的定时提前量; Determining whether the new component carrier belongs to a component carrier group that has been uplink-synchronized, and 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, if If the new component carrier does not belong to any one of the component carrier groups that have been uplink synchronized, the user terminal determines that it is necessary to acquire a new timing advance amount;
在所述用户终端在一个新的分量载波上发送上行信号的步骤中, 在所述 新的分量载波上, 使用其所属的分量载波组的定时提前量确定上行定时, 并 发送上行信号; 或者在所述新的分量载波上, 使用所述新的定时提前量确定 上行定时, 并发送上行信号。 In 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 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.
优选地, 在所述用户终端在所述新的分量载波上发起随机接入以获取新
的定时提前量的步骤之后, 所述方法还包括: Preferably, the user terminal initiates random access on the new component carrier to acquire new After the step of timing advance, the method further includes:
将所述分量载波组的配置信息中, 所述新的分量载波所属的分量载波组 标记为已上行同步, 并将获取的所述新的定时提前量作为该分量载波组的定 时提前量。 In the configuration information of the component carrier group, 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.
优选地, 所述定时提前量的配置信息包含在包含小区无线资源配置信息 或小区载波聚合配置信息的系统信息块中, 所述系统信息块在物理下行共享 信道上发送。 Preferably, the configuration information of the timing advance is included in a system information block including cell radio resource configuration information or cell carrier aggregation configuration information, and the system information block is sent on a physical downlink shared channel.
优选地, 所述定时提前量的指示信息包括指示所述用户终端使用已获得 的定时提前量, 或者不能使用已获得的任何一个定时提前量的信息; Preferably, 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;
在所述用户终端根据所述指示信息决定是否需要获取新的定时提前量的 步骤中, In the step of determining, by the user terminal, whether it is necessary to acquire a new timing advance according to the indication information,
如果所述指示信息指示所述用户终端使用已获得的定时提前量, 则所述 用户终端判定无需获取新的定时提前量, 如果所述指示信息指示所述用户终 端不能使用已获得的任何一个定时提前量, 则所述用户终端判定在所述新的 分量载波上需要发起随机接入以获得一个新的定时提前量; If the indication information indicates that the user terminal uses the obtained timing advance amount, 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;
在所述用户终端在一个新的分量载波上发送上行信号的步骤中, 在新的 分量载波上, 使用所述已获得的定时提前量确定上行定时, 并发送上行信号; 或者在所述新的分量载波上, 使用新的定时提前量确定上行定时, 并发送上 行信号。 In the step of the user terminal transmitting an uplink signal on a new component carrier, determining, on the new component carrier, the uplink timing using the obtained timing advance, and transmitting an uplink signal; or in the new On the component carrier, the new timing advance is used to determine the uplink timing and the uplink signal is transmitted.
优选地, 所述定时提前量的指示信息包含在所述基站为所述用户终端调 度新的分量载波的无线资源控制信令中。 Preferably, 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.
优选地, 在所述用户终端根据所述系统信息中的各分量载波的定时提前 量的配置信息和 /或所述基站发送的定时提前量的指示信息, 决定是否需要获 取新的定时提前量的步骤中, 当所述系统信息中包含所述定时提前量的配置 信息、 并且所述基站也发送了所述定时提前量的指示信息时, 所述用户终端 优先根据所述定时提前量的指示信息决定是否需要获取新的定时提前量。 Preferably, 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. In the step, when the system information includes the configuration information of the timing advance amount, and 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.
优选地, 在所述用户终端判定需要获取新的定时提前量, 则在所述新的 分量载波上发起随机接入以获取新的定时提前量的步骤中,
釆用基于竟争的或基于非竟争的随机接入方式在所述新的分量载波上发 起随机接入; Preferably, in the step that the user terminal determines that it is necessary to acquire a new timing advance, and then initiates random access on the new component carrier to acquire a new timing advance, Initiating random access on the new component carrier using a contention-based or non-contention based random access method;
在所述用户终端釆用基于非竟争的随机接入方式在所述新的分量载波上 发起随机接入的步骤中, In the step of the user terminal initiating random access on the new component carrier by using a non-contention based random access method,
所述基站通过为所述用户终端调度新的分量载波的无线资源控制信令指 示专用的随机接入前导和物理随机接入信道掩码, 所述用户终端根据所述随 机接入前导和物理随机接入信道掩码, 并结合所述新的分量载波上的随机接 入配置参数, 选择物理随机接入信道发送专用的随机接入前导。 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.
优选地,在所述用户终端在所述新的分量载波上发起随机接入的步骤中, 基于对时分双工模式下的新的分量载波、 或基于对频分双工模式下的新的上 行分量载波对应的下行分量载波的下行同步的子帧起始位置发送随机接入前 导, 并假设定时提前量为 0; Preferably, in 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;
在所述用户终端在所述新的分量载波上发送上行信号的步骤中, 根据所 述新的分量载波的下行定时和所述新的定时提前量确定上行定时。 In the 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.
优选地,在所述用户终端在所述新的分量载波上发起随机接入的步骤中, 基于初始接入所下行同步的子帧起始位置发送随机接入前导, 并假设定时提 前量为 0; Preferably, in the step of the user terminal initiating random access on the new component carrier, the random access preamble is sent based on the start position of the subframe in which the initial access is downlink synchronization, and the timing advance is assumed to be 0. ;
在所述用户终端在所述新的分量载波上发送上行信号的步骤中, 根据初 始接入的下行定时和所述新的定时提前量确定上行定时。 In the step of the user terminal transmitting an uplink signal on the new component carrier, the uplink timing is determined according to the downlink timing of the initial access and the new timing advance.
为了解决上述技术问题, 本发明还公开了一种用户终端, 所述用户终端 设置为, 通过初始接入获取一个定时提前量, 并读取基站广播的系统信息; 接收基站的调度信号后, 根据所述系统信息中的各分量载波的定时提前量的 配置信息和 /或所述基站发送的定时提前量的指示信息, 决定是否需要获取新 的定时提前量; 如果需要获取新的定时提前量, 则在所述新的分量载波上发 起随机接入以获取新的定时提前量;并在一个新的分量载波上发送上行信号。 In order to solve the above technical problem, the present invention also discloses a user terminal, where the user terminal is configured to acquire a timing advance amount through initial access, and read system information broadcasted by the base station; after receiving the scheduling signal of the base station, according to The configuration information of the timing advance amount of each component carrier in the system information and/or the indication information of the timing advance amount sent by the base station determines whether a new timing advance amount needs to be acquired; if a new timing advance amount needs to be acquired, Then, random access is initiated on the new component carrier to acquire a new timing advance; and an uplink signal is sent on a new component carrier.
优选地, 所述各分量载波的定时提前量的配置信息包括本小区各分量载 波是否使用相同的定时提前量的信息; Preferably, the configuration information of the timing advance of each component carrier includes information on whether the component carriers of the cell use the same timing advance amount;
所述用户终端是设置为, 如果所述配置信息指示本小区各分量载波使用
相同的定时提前量, 则判定无需获取新的定时提前量, 在所述新的分量载波 上, 使用初始接入所上行同步的分量载波上的定时提前量确定上行定时, 并 发送上行信号; 如果所述配置信息指示本小区各分量载波使用不同的定时提 前量, 则判定需要获取新的定时提前量, 在所述新的分量载波上, 使用所述 新的定时提前量确定上行定时, 并发送上行信号。 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.
优选地, 所述各分量载波的定时提前量的配置信息包括本小区分量载波 组的配置信息, 使用相同的定时提前量的分量载波属于同一个分量载波组; 所述用户终端是设置为, 根据所述配置信息, 将初始接入的分量载波所 属的分量载波组标记为已上行同步, 并将已获取的定时提前量作为该分量载 波组的定时提前量; 判断所述新的分量载波是否属于已上行同步的分量载波 组, 如果所述新的分量载波属于已上行同步的分量载波组, 则所述用户终端 判定无需获取新的定时提前量, 在所述新的分量载波上, 使用其所属的分量 载波组的定时提前量确定上行定时, 并发送上行信号; 如果所述新的分量载 波不属于已上行同步的任何一个分量载波组, 则所述用户终端判定需要获取 新的定时提前量; 在所述新的分量载波上, 使用所述新的定时提前量确定上 行定时, 并发送上行信号。 Preferably, 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.
优选地, 所述用户终端是设置为, 在所述系统信息包含所述定时提前量 的配置信息和所述基站也发送了定时提前量的指示信息时, 优先根据所述定 时提前量的指示信息决定是否需要获取新的定时提前量。 Preferably, 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.
本发明提供的载波聚合系统中不同分量载波上的定时提前量的获取方法 和用户终端,可实现基于小区的( cell-specific )或基于用户终端的( UE-specific ) 不同分量载波上相同或是不同定时提前量的灵活配置, 同时减小随机接入等 上行同步建立和维持的开销。 附图概述 The method for acquiring timing advance on different component carriers in the carrier aggregation system provided by the present invention and the user terminal can implement cell-specific or UE-specific different component carriers on the same or Flexible configuration of different timing advances, while reducing the overhead of uplink synchronization establishment and maintenance such as random access. BRIEF abstract
图 1是 LTE系统基于竟争的随机接入过程的示意图; 1 is a schematic diagram of a contention-based random access procedure of an LTE system;
图 2是定时提前量的示意图; Figure 2 is a schematic diagram of timing advance;
图 3是 LTE-A系统载波聚合示意图。
本发明的较佳实施方式 FIG. 3 is a schematic diagram of carrier aggregation of an LTE-A system. Preferred embodiment of the invention
本发明提供的载波聚合系统中不同分量载波上的定时提前量的获取方 法, 可以釆用如下方式: 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:
(一)基站在系统信息中携带各分量载波的定时提前量的配置信息, 例如, 本小区各分量载波是否使用相同的定时提前量的信息。 (1) 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.
所述用于指示各分量载波是否使用相同的定时提前量的系统信息为 1 比 特,该比特信息为 0 (或 1 )表示各分量载波使用相同的定时提前量, 为 1 (或 0 )表示使用不同的定时提前量。 The system information for indicating whether each component carrier uses the same timing advance amount is 1 bit, and the bit information is 0 (or 1), indicating that each component carrier uses the same timing advance amount, and 1 (or 0) indicates use. Different timing advances.
所述定时提前量的配置信息可以承载于包含小区无线资源配置信息或小 区载波聚合配置信息的系统信息块 SIB中, 所述 SIB在物理下行共享信道上 发送。 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.
所述各分量载波是指 TDD模式下的分量载波, 或 FDD模式下的上行分 量载波。 The component carriers refer to component carriers in TDD mode or uplink component carriers in FDD mode.
TDD模式下,所述系统信息在所有分量载波或部分分量载波上广播; FDD 模式下, 所述系统信息在所有下行分量载波或部分下行分量载波上广播。 In the TDD 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.
用户终端通过初始接入(initial access ) , 获得一个定时提前量, 并读取 基站广播的系统信息, 该系统消息包括小区各分量载波是否使用相同的定时 提前量的信息。 The user terminal obtains a timing advance by initial access, and reads system information broadcast by the base station, where the system message includes information on whether the component carriers of the cell use the same timing advance amount.
用户终端在已上行同步的分量载波上, 根据定时提前量确定上行定时, 发送上行信号。 The user terminal determines the uplink timing according to the timing advance amount on the component carrier that has been uplink synchronized, and transmits an uplink signal.
当基站调度用户终端在一个新的分量载波上发送上行信号时, 用户终端 根据所述系统信息中各分量载波的定时提前量的配置信息, 决定是否需要获 取新的定时提前量, 如果需要, 则在新的分量载波上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on a new component carrier, 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.
如果所述配置信息指示本小区各分量载波使用相同的定时提前量, 则用 户终端在新的分量载波上无需发起随机接入。 用户终端在新的分量载波上, 使用初始接入所上行同步的分量载波上的定时提前量确定上行定时, 进而发 送上行信号。 If the configuration information indicates that each component carrier of the cell uses the same timing advance, the user terminal does not need to initiate random access on the new component carrier. 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.
如果所述配置信息指示本小区各分量载波使用不同的定时提前量, 则用
户终端在新的分量载波上需要发起随机接入以获得一个新的定时提前量。 用 户终端在新的分量载波上, 使用新的定时提前量确定上行定时, 进而发送上 行信号。 If the configuration information indicates that each component carrier of the cell uses a different timing advance, 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.
(二)基站在系统信息中携带各分量载波的定时提前量的配置信息, 例如, 指示本小区哪些分量载波使用相同的定时提前量。 (2) The base station carries the configuration information of the timing advance of each component carrier in the system information, for example, indicating which component carriers of the local cell use the same timing advance.
所述用于指示哪些分量载波使用相同的定时提前量的系统信息为分量载 波组的配置信息, 使用相同定时提前量的分量载波组成一个分量载波组, 使 用不同定时提前量的分量载波属于不同的分量载波组。 每个分量载波组至少 有一个分量载波。 The system information for indicating which component carriers use the same timing advance amount is the configuration information of the component carrier group, and the component carriers of the same timing advance amount are used to form one component carrier group, and the component carriers using different timing advance amounts belong to different groups. Component carrier group. Each component carrier group has at least one component carrier.
所述定时提前量的配置可以承载于包含小区无线资源配置信息或小区载 波聚合配置信息的系统信息块 SIB中,所述 SIB在物理下行共享信道上发送。 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.
所述分量载波是指 TDD模式下的分量载波, 或 FDD模式下的上行分量 载波。 The component carrier refers to a component carrier in TDD mode, or an uplink component carrier in FDD mode.
TDD模式下,所述系统信息在所有分量载波或部分分量载波上广播; FDD 模式下, 所述系统信息在所有下行分量载波或部分下行分量载波上广播。 In the TDD 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.
用户终端通过初始接入, 获得一个定时提前量, 并读取基站广播的系统 信息, 该系统信息包括小区哪些分量载波使用相同的定时提前量的信息。 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.
用户终端在已上行同步的分量载波上 ,根据定时提前量确定的上行定时 , 发送上行信号。 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.
用户终端根据分量载波组的配置信息, 将已上行同步的分量载波所属的 分量载波组标记为已上行同步, 并将获得的定时提前量作为该分量载波组的 定时提前量。 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.
当基站调度用户终端在一个新的分量载波上发送上行信号时, 用户终端 根据所述系统信息中的各分量载波的定时提前量的配置信息, 即分量载波组 的配置信息, 判断新的分量载波是否属于已上行同步的某个分量载波组, 决 定是否需要在新的分量载波上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on a new component carrier, 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.
如果新的分量载波属于已上行同步的某个分量载波组, 则用户终端在新 的分量载波上无需发起随机接入。 用户终端在新的分量载波上, 使用其所属
的分量载波组的定时提前量确定上行定时, 进而发送上行信号。 If the new component carrier belongs to a certain component carrier group that has been uplink synchronized, 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.
如果新的分量载波不属于已上行同步的任何一个分量载波组, 则用户终 端在新的分量载波上需要发起随机接入以获得一个新的定时提前量。 当随机 接入过程完成后, 根据分量载波组的配置信息, 将该分量载波所属的分量载 波组标记为已上行同步, 并将获得的新的定时提前量作为该分量载波组的定 时提前量。 用户终端在新的分量载波上, 使用新的定时提前量确定上行定时, 进而发送上行信号。 If the new component carrier does not belong to any of the component carrier groups that have been uplink synchronized, 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.
(三)基站向用户终端发送定时提前量的指示信息, 指示用户终端使用该 用户终端已获得的某个定时提前量, 或者不能使用已获得的任何一个定时提 前量。 (3) The base station transmits the timing advance amount indication information to the user terminal, instructing the user terminal to use a certain timing advance amount that the user terminal has obtained, or cannot use any of the timing advance amounts that have been obtained.
用户终端通过初始接入, 获得一个定时提前量。 The user terminal obtains a timing advance by initial access.
在已上行同步的分量载波上,用户终端根据定时提前量确定的上行定时, 发送上行信号。 On the component carrier that has been uplinked, the user terminal sends an uplink signal according to the uplink timing determined by the timing advance.
当基站调度用户终端在一个新的分量载波上发送上行信号时, 指示用户 终端使用该用户终端已获得的某个定时提前量, 或者不能使用已获得的任何 一个定时提前量。 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.
如果基站指示用户终端使用已获得的某个定时提前量, 则用户终端根据 所述指示信息决定无需在该新的分量载波上发起随机接入; 用户终端在新的 分量载波上, 使用所述指示信息指示的定时提前量确定上行定时, 进而发送 上行信号。 If the base station indicates that the user terminal uses a certain 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.
如果基站指示用户终端不能使用已获得的任何一个定时提前量, 则用户 终端根据所述指示信息在新的分量载波上需要发起随机接入以获得一个新的 定时提前量。 用户终端在新的分量载波上, 使用新的定时提前量确定上行定 时, 进而发送上行信号。 If the base station indicates that the user terminal cannot use any of the timing advances that have been obtained, 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.
上述指示信息可以通过基站给用户终端调度新的分量载波的 RRC( Radio The foregoing indication information may be used by the base station to schedule a new component carrier RRC (Radio)
Resource Control, 无线资源控制)信令发送给用户终端。 Resource Control, Radio Resource Control) signaling is sent to the user terminal.
综上, 方法(一)和方法(二)是基于小区的( cell-specific ) , 方法(三) 是基于用户终端的 ( UE-specific ) 。 其中, 方法 (一)和方法 (三) , 或者
方法 (二)和方法 (三)可以配合使用, 且对某个分量载波, 基于用户终端 的定时提前量的指示信息优先级高于基于小区的定时提前量的配置信息。 例 如, 当基站在系统信息中指示了基于小区的定时提前量的配置信息, 如各分 量载波是否使用相同的定时提前量, 或本小区哪些分量载波使用相同的定时 提前量,又在 RRC信令中对某个用户终端在某个分量载波上获取定时提前量 进行指示时, 该用户终端应以基于用户终端的 RRC信令中的指示为准。 In summary, method (1) and method (2) are cell-specific, and method (3) is based on user-terminal (UE-specific). Wherein, 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. For example, when the base station indicates configuration information of the timing advance amount based on the cell in the system information, such as whether each component carrier uses the same timing advance amount, or which component carriers of the local cell use the same timing advance amount, and in the RRC signaling In the case that a certain user terminal indicates the timing advance on a certain component carrier, the user terminal shall take the indication in the RRC signaling based on the user terminal as the standard.
当基站调度用户终端在一个新的分量载波上发送上行信号, 并且用户终 端需要在新的分量载波上发起随机接入以获得新的定时提前量时, 用户终端 可以釆用基于竟争的或基于非竟争的随机接入方式。 当用户终端釆用基于非 竟争的随机接入时,基站通过给该用户终端调度新的分量载波的 RRC信令指 示专用的随机接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用 户终端结合新的分量载波上的随机接入配置参数, 选择物理随机接入信道发 送专用的随机接入前导。 When the base station schedules the user terminal to transmit an uplink signal on a new component carrier, and the user terminal needs to initiate random access on the new component carrier to obtain a new timing advance, the user terminal may use the contention based or based on Non-competitive random access method. When the user terminal uses the non-contention based random access, 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. . The user terminal combines the random access configuration parameters on the new component carrier to select a physical random access channel to transmit a dedicated random access preamble.
在新的分量载波上, 用户终端可以基于对该分量载波(TDD模式)或该 上行分量载波对应的下行分量载波(FDD模式)下行同步的子帧起始位置发 送随机接入前导 (假设定时提前量为 0 ) 。 用户终端在各新的分量载波上按 照各自的下行定时和定时提前量确定各分量载波上的上行定时, 进而发送各 分量载波上的上行信号。 On the new component carrier, 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.
所谓基于下行同步的子帧起始位置发送随机接入前导(假设定时提前量 为 0 ) , 是指对于 FDD模式, 随机接入前导在下行同步的子帧起始位置开始 发送; 对于 TDD模式, 随机接入前导格式 0~3在下行同步的子帧起始位置开 始发送, 随机接入前导格式 4在下行同步的时隙 UpPTS的结束位置前 5158 个 Ts开始发送。 其中, Ts=l/(15000 x 2048)秒。 The so-called random access preamble based on the downlink synchronization start position (assuming the timing advance is 0) means that for the FDD mode, the random access preamble starts to be transmitted at the start position of the downlink synchronization subframe; for the TDD mode, The random access preamble format 0~3 starts to be transmitted at the start position of the downlink synchronization subframe, and the random access preamble format 4 starts to transmit at 5158 Ts before the end position of the downlink synchronization time slot UpPTS. Where Ts = l / (15000 x 2048) seconds.
在新的分量载波上, 用户终端也可以基于初始接入所下行同步的子帧起 始位置发送随机接入前导 (假设定时提前量为 0 ) 。 用户终端在各新的分量 载波上按照初始接入的下行定时, 和各新的分量载波上的定时提前量确定各 分量载波上的上行定时, 进而发送上行信号。 On the new component carrier, the user terminal may also transmit a random access preamble based on the starting position of the subframe in which the initial access is downlinked (assuming that the timing advance is 0). The user terminal determines the uplink timing on each component carrier according to the downlink timing of the initial access and the timing advance on each new component carrier on each new component carrier, and further transmits an uplink signal.
下面将结合实施例和附图详细描述本发明。 The invention will be described in detail below with reference to the embodiments and the accompanying drawings.
实施例一
假定一个载波聚合的 LTE-A系统, 工作在 TDD模式下, 有 5个分量载 波 CC 1~5。 Embodiment 1 Assume that a carrier-aggregated LTE-A system operates in TDD mode with five component carriers CC 1~5.
基站在各分量载波的系统信息中用 1 比特(该比特为 1 )指示本小区各 分量载波使用不同的定时提前量。 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.
用户终端在初始接入时, 先在 CC1上完成下行同步和随机接入, 获得下 行( DL )定时( timing ) 1 , 以及定时提前量 TA1 , 并读取 CC1上的系统信息, 包括系统信息中各分量载波定时提前量的 lbit配置信息。 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.
用户终端在已上行同步的分量载波 CC1上,按照下行定时 DL timingl和 定时提前量 TA1确定的上行定时, 发送上行信号。 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.
当基站调度用户终端在 CC3上发送上行信号时, 用户终端根据所述系统 信息中各分量载波定时提前量的配置信息,决定需要在 CC3上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on CC3, the user terminal determines that random access needs to be initiated on CC3 according to the configuration information of the timing advance of each component carrier in the system information.
用户终端先在 CC3上完成下行同步, 获得下行定时 DL timing3 , 并读取 CC3上的系统信息。 再根据系统信息中的随机接入配置参数, 在 CC3上发起 基于竟争的随机接入过程, 得到一个新的定时提前量 TA3。 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.
或者, 基站在调度 CC3给用户终端时, 在 RRC信令中配置了专用的随 机接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端结合 CC3上的随机接入配置参数, 在 CC3上发起基于非竟争的随机接入过程, 得 到一个新的定时提前量 TA3。 Alternatively, 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. 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.
用户终端在新的分量载波上, 按照下行定时 DL timing3 , 和新的定时提 前量 TA3确定上行定时, 进而发送上行信号。 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.
实施例二 Embodiment 2
假定一个载波聚合的 LTE-A系统, 工作在 FDD模式下, 有 2个下行分 量载波 D1和 D2, 以及 2个上行分量载波 U1和 U2。 Assume that 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.
基站在 D1, D2 (或只在 D1 )的系统信息中用 1比特(该比特为 0 )指示 本小区各分量载波使用相同的定时提前量。 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.
户终端在初始接入时, 先在 D1和 U1上完成下行同步和随机接入, 获得 下行定时 DL timingl , 以及定时提前量 TA1 , 并读取 D 1上的系统信息, 包括
系统信息中各分量载波定时提前量的 lbit配置信息。 During initial access, 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.
用户终端在已上行同步的 U1上, 按照下行定时 DL timingl和定时提前 量 TA1确定的上行定时, 发送上行信号。 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.
当基站调度用户终端在 U2 上发送上行信号时, 用户终端根据所述系统 信息中各分量载波定时提前量的配置信息, 决定不需要在 U2 上发起随机接 入。 When the base station schedules the user terminal to send an uplink signal on the U2, 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.
用户终端先在 D2上完成下行同步, 获得下行定时 DL timing2, 并读取 D2上的系统信息。 The user terminal first performs downlink synchronization on D2, obtains downlink timing DL timin g 2, and reads system information on D2.
用户终端在 U2上, 按照下行定时 DL timing2, 和定时提前量 TA1确定 的上行定时, 发送上行信号。 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.
或者, Dl, D2以及 Ul , U2是严格时频同步的, 则用户终端在 U2上, 按照 D1上的下行定时 DL timingl ,和 U1上的定时提前量 TA1确定的上行定 时, 发送上行信号。 Alternatively, Dl, D2 and Ul, U2 are strictly time-frequency synchronized, and the user terminal transmits an uplink signal on U2 according to the uplink timing determined by the downlink timing DL timingl on D1 and the timing advance TA1 on U1.
实施例三 Embodiment 3
假定一个载波聚合的 LTE-A系统, 工作在 TDD模式下, 有 4个分量载 波 CC 0~3。 其中, CC0和 CC1有相同的定时提前量, 为分量载波组 0; CC2 和 CC3有相同的定时提前量, 为分量载波组 1。 Assume that a carrier-aggregated LTE-A system operates in TDD mode with four component carriers CC 0~3. Among them, 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.
基站在每个分量载波的系统信息中指示本小区哪些分量载波使用相同的 定时提前量。 具体地, 可以在小区无线资源配置信息或小区载波聚合配置信 息中指示 CC0和 CC1为分量载波组 0; CC2和 CC3为分量载波组 1。 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 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.
用户终端在初始接入时, 先在 CC3上完成下行同步和随机接入, 获得下 行定时 DL timing3 , 以及一个定时提前量 TA3 , 并读取 CC3上的系统信息, 包括系统信息中各分量载波的定时提前量的配置信息, 即分量载波组的配置 信息。 When the user terminal initially accesses, the downlink synchronization and random access are completed on the CC3, the downlink timing DL timing3 is obtained, and a timing advance amount TA3 is obtained, and 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.
用户终端根据分量载波组的配置信息, 将已上行同步的 CC3所属的分量 载波组 1标记为已上行同步, 并将获得的定时提前量 TA3作为该分量载波组 的定时提前量。 The user terminal marks the component carrier group 1 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.
用户终端在已上行同步的 CC3上, 按照下行定时 DL timing3 , 和定时提
前量 TA3确定的上行定时, 发送上行信号。 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.
当基站调度用户终端在 CC2上发送上行信号时, 用户终端根据所述分量 载波组的配置信息, 判断 CC2属于已上行同步的分量载波组 1 , 决定不需要 在 CC2上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on the CC2, 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.
用户终端先在 CC2上完成下行同步, 获得下行定时 DL timing2, 并读取The user terminal first completes downlink synchronization on CC2, obtains downlink timing DL timin g 2, and reads
CC2上的系统信息。 System information on CC2.
用户终端在 CC2上, 按照下行定时 DL timing2, 和定时提前量 TA3确定 的上行定时, 发送上行信号。 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.
或者, CC3, CC2是严格时频同步的, 则用户终端在 CC2上, 按照 CC3 上的下行定时 DL timing3 , 和 CC3上的定时提前量 TA3确定的上行定时, 发 送上行信号。 Alternatively, 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.
当基站调度用户终端在 CC0 (或 CC1 )上发送上行信号时, 用户终端根 据所述分量载波组的配置信息,判断 CC0不属于已上行同步的分量载波组 1 , 决定需要在 CC0上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on CC0 (or CC1), the user terminal determines, according to the configuration information of the component carrier group, that CC0 does not belong to the component carrier group 1 that has been uplinked, and determines that a random connection needs to be initiated on CC0. In.
用户终端先在 CC0上完成下行同步, 获得下行定时 DL timingO, 并读取 The user terminal first completes downlink synchronization on CC0, obtains downlink timing DL timingO, and reads
CC0上的系统信息。 再根据系统信息中的随机接入配置参数, 在 CC0上发起 基于竟争的随机接入过程, 得到一个新的定时提前量 TA0。 System information on CC0. Then, according to the random access configuration parameter in the system information, a contention-based random access procedure is initiated on CC0, and a new timing advance TA0 is obtained.
或者, 基站在调度 CC0给用户终端时, 在 RRC信令中配置了专用的随 机接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端结合 CC0上的随机接入配置参数, 在 CC0上发起基于非竟争的随机接入过程, 得 到一个新的定时提前量 TA0。 Alternatively, 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. 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.
用户终端根据分量载波组的配置信息, 将已上行同步的 CC0所属的分量 载波组 0标记为已上行同步, 并将获得的定时提前量 TA0作为该分量载波组 的定时提前量。 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.
用户终端在 CC0上, 按照下行定时 DL timingO, 和定时提前量 TA0确定 的上行定时, 发送上行信号。 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.
实施例四
假定一个载波聚合的 LTE-A系统, 工作在 FDD模式下, 有 3个下行分 量载波 D0、 D1和 D2, 以及 3个上行分量载波 U0、 U1和 U2。 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.
户终端在初始接入时, 先在 D1和 U1上完成下行同步和随机接入, 获得 下行定时 DL timingl , 以及定时提前量 TA1 , 并读取 D 1上的系统信息。 During initial access, 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.
用户终端在已上行同步的 U1上,按照下行定时 DL timingl , 和定时提前 量 TA1确定上行定时, 发送上行信号。 The user terminal determines the uplink timing and transmits the uplink signal according to the downlink timing DL timing1 and the timing advance TA1 on the U1 that has been uplink synchronized.
当基站调度用户终端在 U2上发送上行信号时, 通过 RRC信令指示用户 终端在 U2 上不能使用该用户终端已获得的任何一个定时提前量。 用户终端 需要在 U2上发起随机接入。 When 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.
用户终端先在 D2上完成下行同步, 获得 DL timing2, 并读取 D2上的系 统信息。 再根据系统信息中的随机接入配置参数, 在 U2 上发起基于竟争的 随机接入过程, 得到一个新的定时提前量 TA2。 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.
或者, 基站在调度 U2给用户终端时, 在 RRC信令中配置了专用的随机 接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端结合 D2上的随机接入配置参数, 在 U2上发起基于非竟争的随机接入过程, 得到 一个新的定时提前量 TA2。 Alternatively, 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. 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.
用户终端在 U2上, 按照下行定时 DL timing2, 和定时提前量 TA2确定 上行定时, 发送上行信号。 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.
当基站调度用户终端在 U0上发送上行信号时, 通过 RRC信令指示用户 终端在 U0上使用该用户终端已获得的定时提前量 TA1。 用户终端不需要在 U0上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on U0, 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.
用户终端先在 DO上完成下行同步, 获得下行定时 DL timingO, 并读取 DO上的系统信息。 The user terminal first performs downlink synchronization on the DO, obtains downlink timing DL timingO, and reads system information on the DO.
用户终端在 U0上,按照下行定时 DL timingO, 和信令指示的定时提前量 The user terminal is on U0, according to the downlink timing DL timingO, and the timing advance indicated by the signaling.
TA1确定上行定时, 发送上行信号。 TA1 determines the uplink timing and sends an uplink signal.
或者, Dl, DO是严格时频同步的, 则用户终端在 U0上, 按照在 D1上的 下行定时 DL timingl , 和信令指示的 TA1确定上行定时, 发送上行信号。
实施例五 Alternatively, 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
假定一个载波聚合的 LTE-A系统, 工作在 TDD模式下, 有 5个分量载 波 CC 0~4。 其中, CC0和 CC1有相同的定时提前量, 为分量载波组 0; CC2 为分量载波组 1 ; CC3和 CC4有相同的定时提前量, 为分量载波组 2。 Assume that a carrier-aggregated LTE-A system operates in TDD mode with five component carriers CC 0~4. Among them, 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.
基站在每个分量载波的系统信息中指示本小区哪些分量载波使用相同的 定时提前量。 具体说, 是在小区无线资源配置信息或小区载波聚合配置信息 中指示 CC0和 CC1为分量载波组 0; CC2为分量载波组 1 ; CC3和 CC4为分 量载波组 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.
用户终端在初始接入时, 先在 CC0上完成下行同步和随机接入, 获得下 行定时 DL timingO, 以及一个定时提前量 TAO, 并读取 CCO上的系统信息, 包括系统信息中各分量载波的定时提前量的配置信息, 即分量载波组的配置 信息。 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.
用户终端根据分量载波组的配置信息, 将已上行同步的 CC0所属的分量 载波组 0标记为已上行同步, 并将获得的定时提前量 TA0作为该分量载波组 的定时提前量。 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.
用户终端在已上行同步的 CC0上, 按照下行定时 DL timingO, 和定时提 前量 TA0确定上行定时, 发送上行信号。 The user terminal determines the uplink timing and transmits the uplink signal according to the downlink timing DL timingO and the timing advance amount TA0 on the CC0 that has been uplink synchronized.
当基站调度用户终端在 CC1上发送上行信号时, 用户终端根据所述分量 载波组的配置信息, 判断 CC1属于已上行同步的分量载波组 0, 决定不需要 在 CC1上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on CC1, 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.
用户终端先在 CC1上完成下行同步, 获得下行定时 DL timingl , 并读取 CC1上的系统信息。 The user terminal first performs downlink synchronization on CC1, obtains downlink timing DL timingl, and reads system information on CC1.
用户终端在 CC1上, 按照下行定时 DL timingl , 和定时提前量 TA0确定 上行定时, 发送上行信号。 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.
或者, CCO, CC1是严格时频同步的, 则用户终端在 CC1上, 按照 CC0 上的下行定时 DL timingO , 和 CC0上的定时提前量 TA0确定上行定时, 发送 上行信号。 Alternatively, if the CCO and CC1 are strictly time-frequency synchronized, 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.
当基站调度用户终端在 CC2上发送上行信号时, 用户终端根据所述分量 载波组的配置信息, 判断 CC2不属于已上行同步的分量载波组 0, 决定需要
在 CC3上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on the CC2, 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.
用户终端先在 CC2上完成下行同步, 获得下行定时 DL timing2, 并读取 CC2上的系统信息。 再根据系统信息中的随机接入配置参数, 在 CC2上发起 基于竟争的随机接入过程, 得到一个新的定时提前量 TA2。 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.
或者, 基站在调度 CC2给用户终端时, 在 RRC信令中配置了专用的随 机接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端结合 CC2上的随机接入配置参数, 在 CC2上发起基于非竟争的随机接入过程, 得 到一个新的定时提前量 TA2。 Alternatively, 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. 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.
用户终端根据分量载波组的配置信息, 将已上行同步的 CC2所属的分量 载波组 1标记为已上行同步, 并将获得的定时提前量 TA2作为该分量载波组 的定时提前量。 The user terminal marks the component carrier group 1 to which the uplink synchronization CC2 belongs as uplink synchronization according to the configuration information of the component carrier group, and uses the obtained timing advance amount TA2 as the timing advance amount of the component carrier group.
用户终端在 CC2上, 按照下行定时 DL timing2, 和定时提前量 TA2确定 上行定时, 发送上行信号。 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.
当基站调度用户终端在 CC3上发送上行信号时, 用户终端根据所述分量 载波组的配置信息, 判断 CC3不属于已上行同步的分量载波组 0或分量载波 组 1 , 决定需要在 CC3上发起随机接入。 When the base station schedules the user terminal to send an uplink signal on the CC3, 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.
用户终端先在 CC3上完成下行同步, 获得下行定时 DL timing3 , 并读取 CC3上的系统信息。 再根据系统信息中的随机接入配置参数, 在 CC3上发起 基于竟争的随机接入过程, 得到一个新的定时提前量 TA3。 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.
或者, 基站在调度 CC3给用户终端时, 在 RRC信令中配置了专用的随 机接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端结合 CC3上的随机接入配置参数, 在 CC3上发起基于非竟争的随机接入过程, 得 到一个新的定时提前量 TA3。 Alternatively, 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. 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.
用户终端根据分量载波组的配置信息, 将已上行同步的 CC3所属的分量 载波组 2标记为已上行同步, 并将获得的定时提前量 TA3作为该分量载波组 的定时提前量。 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.
用户终端在 CC3上, 按照下行定时 DL timing3 , 和定时提前量 TA3确定 上行定时, 发送上行信号。 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.
当基站调度用户终端在 CC4上发送上行信号时, 通过 RRC信令指示用
户终端在 CC4 上不能使用该用户终端已获得的任何一个定时提前量(TA0, TA2, 或 TA3 ) 。 用户终端需要在 CC4上发起随机接入。 When 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.
用户终端先在 CC4上完成下行同步, 获得下行定时 DL timing4, 并读取 CC4上的系统信息。 再根据系统信息中的随机接入配置参数, 在 CC4上发起 基于竟争的随机接入过程, 得到一个新的定时提前量 TA4。 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.
或者, 基站在调度 CC4给用户终端时, 在 RRC信令中配置了专用的随 机接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端结合 CC4上的随机接入配置参数, 在 CC4上发起基于非竟争的随机接入过程, 得 到一个新的定时提前量 TA4。 Alternatively, 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. 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.
用户终端在 CC4上, 按照下行定时 DL timing4, 和定时提前量 TA4确定 上行定时, 发送上行信号。 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.
实施例六 Embodiment 6
假定一个载波聚合的 LTE-A系统, 工作在 TDD模式下, 有 5个分量载 波 CC 1~5。 Assume that a carrier-aggregated LTE-A system operates in TDD mode with five component carriers CC 1~5.
基站在每个分量载波的系统信息中用 1 比特(该比特为 1 )指示本小区 各分量载波使用不同的定时提前量。 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.
用户终端在初始接入时, 先在 CC1上完成下行同步和随机接入, 获得下 行定时 DL timingl , 以及定时提前量 TAl , 并读取 CCl上的系统信息, 包括 系统信息中各分量载波定时提前量的 lbit配置信息。 When the user terminal initially accesses, 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.
用户终端在已上行同步的 CC1上, 按照下行定时 DL timingl , 和定时提 前量 TA1确定上行定时, 发送上行信号。 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.
当基站调度用户终端在 CC3上发送上行信号时, 用户终端根据所述系统 信息, 决定需要在 CC3上发起随机接入。 When 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.
用户终端从 CC1上的系统信息中获得了 CC3上的随机接入配置参数,在 CC3上基于 DL timingl发送随机接入前导, 发起基于竟争的随机接入过程, 得到一个新的定时提前量 TA3。 The user terminal obtains the random access configuration parameter on the CC3 from the system information on the CC1, sends a random access preamble based on the DL timing1 on the CC3, initiates a random access procedure based on the competition, and obtains a new timing advance TA3. .
或者, 基站在调度 CC3给用户终端时, 在 RRC信令中配置了 CC3上的 随机接入配置参数, 专用的随机接入前导和物理随机接入信道掩码 ( PRACH Mask index ) 。 用户终端在 CC3上基于 DL timingl发送随机接入前导, 发起
基于非竟争的随机接入过程, 得到一个新的定时提前量 TA3。 Alternatively, when scheduling the CC3 to the user terminal, the base station configures a random access configuration parameter, a dedicated random access preamble, and a physical random access channel mask (PRACH Mask index) on the CC3 in the RRC signaling. The user terminal sends a random access preamble based on DL timing1 on CC3, and initiates Based on the non-contention random access procedure, a new timing advance TA3 is obtained.
用户终端在 CC3上, 按照初始接入时的下行定时 DL timingl , 和定时提 前量 TA3确定上行定时, 发送上行信号。 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.
本发明还公开了一种用户终端, 所述用户终端设置为, 通过初始接入获 取一个定时提前量, 并读取基站广播的系统信息; 接收基站的调度信号后, 根据所述系统信息中的各分量载波的定时提前量的配置信息和 /或所述基站 发送的定时提前量的指示信息, 决定是否需要获取新的定时提前量; 如果需 要获取新的定时提前量, 则在所述新的分量载波上发起随机接入以获取新的 定时提前量; 并在一个新的分量载波上发送上行信号。 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.
其中, 所述各分量载波的定时提前量的配置信息包括本小区各分量载波 是否使用相同的定时提前量的信息; The configuration information of the timing advance amount of each component carrier includes information about whether the same timing advance amount is used by each component carrier of the local cell;
所述用户终端是设置为, 如果所述配置信息指示本小区各分量载波使用 相同的定时提前量, 则判定无需获取新的定时提前量, 在所述新的分量载波 上, 使用初始接入所上行同步的分量载波上的定时提前量确定上行定时, 并 发送上行信号; 如果所述配置信息指示本小区各分量载波使用不同的定时提 前量, 则判定需要获取新的定时提前量, 在所述新的分量载波上, 使用所述 新的定时提前量确定上行定时, 并发送上行信号。 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.
其中, 所述各分量载波的定时提前量的配置信息包括本小区分量载波组 的配置信息, 使用相同的定时提前量的分量载波属于同一个分量载波组; 所述用户终端是设置为, 根据所述配置信息, 将初始接入的分量载波所 属的分量载波组标记为已上行同步, 并将已获取的定时提前量作为该分量载 波组的定时提前量; 判断所述新的分量载波是否属于已上行同步的分量载波 组, 如果所述新的分量载波属于已上行同步的分量载波组, 则所述用户终端 判定无需获取新的定时提前量, 在所述新的分量载波上, 使用其所属的分量 载波组的定时提前量确定上行定时, 并发送上行信号; 如果所述新的分量载 波不属于已上行同步的任何一个分量载波组, 则所述用户终端判定需要获取 新的定时提前量; 在所述新的分量载波上, 使用所述新的定时提前量确定上 行定时, 并发送上行信号。 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.
另外, 所述用户终端是设置为, 在所述系统信息包含所述定时提前量的
配置信息和所述基站也发送了定时提前量的指示信息时, 优先根据所述定时 提前量的指示信息决定是否需要获取新的定时提前量。 In addition, the user terminal is configured to include, in the system information, the timing advance amount When 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.
上述用户终端的功能与方法实施例中的用户终端的功能相同, 在此不赘 述。 The functions of the user terminal are the same as those of the user terminal in the method embodiment, and are not described herein.
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。 One of ordinary skill in the art will appreciate that all or a portion of the steps above may be accomplished by a program to instruct the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.
当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.
工业实用性 本发明提供的一种定时提前量的获取方法和用户终端, 可应用于载波聚 合系统中, 使用户终端能够获取不同分量载波上的定时提前量, 从而保持了 上行同步, 同时减小了随机接入等上行同步建立和维持的开销。
INDUSTRIAL APPLICABILITY A method for acquiring timing advance amount and a user terminal provided by the present invention can be applied to a carrier aggregation system, so that a user terminal can acquire timing advance amounts on different component carriers, thereby maintaining uplink synchronization and reducing The overhead of establishing and maintaining uplink synchronization, such as random access.
Claims
1、 一种定时提前量的获取方法, 包括: 1. A method for obtaining a timing advance amount, comprising:
用户终端通过初始接入, 获取一个定时提前量, 并读取基站广播的系统 信息; The user terminal acquires a timing advance amount through initial access, and reads system information broadcast by the base station;
当所述基站调度所述用户终端在一个新的分量载波上发送上行信号时, 所述用户终端根据所述系统信息中的各分量载波的定时提前量的配置信息和 /或所述基站发送的定时提前量的指示信息, 决定是否需要获取新的定时提前 量; 如果需要获取新的定时提前量, 则在所述新的分量载波上发起随机接入 以获取新的定时提前量。 When the base station schedules the user terminal to send an uplink signal on a new component carrier, the user terminal is configured according to configuration information of a timing advance amount of each component carrier in the system information, and/or sent by the base station. The indication information 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.
2、 如权利要求 1所述的方法, 其中, 2. The method of claim 1 wherein
所述各分量载波的定时提前量的配置信息包括本小区各分量载波是否使 用相同的定时提前量的信息; The configuration information of the timing advance of each component carrier includes information about whether the same timing advance amount is used by each component carrier of the current cell;
在所述用户终端根据所述配置信息决定是否需要获取新的定时提前量的 步骤中, In the step of determining, by the user terminal, whether it is necessary to acquire a new timing advance according to the configuration information,
如果所述配置信息指示本小区各分量载波使用相同的定时提前量, 则所 述用户终端判定无需获取新的定时提前量, 如果所述配置信息指示本小区各 分量载波使用不同的定时提前量, 则所述用户终端判定需要获取新的定时提 前量; If the configuration information indicates that each component carrier of the cell uses the same timing advance, 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;
在所述用户终端在一个新的分量载波上发送上行信号的步骤中, 在所述 新的分量载波上, 使用初始接入所上行同步的分量载波上的定时提前量确定 上行定时, 并发送上行信号; 或者在所述新的分量载波上, 使用所述新的定 时提前量确定上行定时, 并发送上行信号。 In 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.
3、 如权利要求 1所述的方法, 其中, 3. The method of claim 1, wherein
所述各分量载波的定时提前量的配置信息包括本小区分量载波组的配置 信息, 使用相同的定时提前量的分量载波属于同一个分量载波组; 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;
在所述用户终端根据所述配置信息决定是否需要获取新的定时提前量的 步骤中, 所述用户终端根据所述配置信息, 将初始接入的分量载波所属的分量载 波组标记为已上行同步, 并将已获取的定时提前量作为该分量载波组的定时 提前量; In the step of determining, by the user terminal, whether it is necessary to acquire a new timing advance according to the configuration information, The user terminal marks, according to the configuration information, a component carrier group to which the initially accessed component carrier belongs as uplink synchronization, and uses the acquired timing advance amount as a timing advance amount of the component carrier group;
判断所述新的分量载波是否属于已上行同步的分量载波组, 如果所述新 的分量载波属于已上行同步的分量载波组, 则所述用户终端判定无需获取新 的定时提前量, 如果所述新的分量载波不属于已上行同步的任何一个分量载 波组, 则所述用户终端判定需要获取新的定时提前量; Determining whether the new component carrier belongs to a component carrier group that has been uplink-synchronized, and 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, if If the new component carrier does not belong to any one of the component carrier groups that have been uplink synchronized, the user terminal determines that it is necessary to acquire a new timing advance amount;
在所述用户终端在一个新的分量载波上发送上行信号的步骤中, 在所述 新的分量载波上, 使用其所属的分量载波组的定时提前量确定上行定时, 并 发送上行信号; 或者在所述新的分量载波上, 使用所述新的定时提前量确定 上行定时, 并发送上行信号。 In 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 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.
4、 如权利要求 3所述的方法, 其中, 4. The method of claim 3, wherein
在所述用户终端在所述新的分量载波上发起随机接入以获取新的定时提 前量的步骤之后, 所述方法还包括: After the step of the user terminal initiating a random access on the new component carrier to obtain a new timing advance amount, the method further includes:
将所述分量载波组的配置信息中, 所述新的分量载波所属的分量载波组 标记为已上行同步, 并将获取的所述新的定时提前量作为该分量载波组的定 时提前量。 In the configuration information of the component carrier group, 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.
5、 如权利要求 2、 3或 4所述的方法, 其中, 5. The method of claim 2, 3 or 4, wherein
所述定时提前量的配置信息包含在包含小区无线资源配置信息或小区载 波聚合配置信息的系统信息块中, 所述系统信息块在物理下行共享信道上发 送。 The configuration information of the timing advance is included in a system information block including cell radio resource configuration information or cell carrier aggregation configuration information, and the system information block is transmitted on a physical downlink shared channel.
6、 如权利要求 1所述的方法, 其中, 6. The method of claim 1, wherein
所述定时提前量的指示信息包括指示所述用户终端使用已获得的定时提 前量, 或者不能使用已获得的任何一个定时提前量的信息; 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;
在所述用户终端根据所述指示信息决定是否需要获取新的定时提前量的 步骤中, In the step of determining, by the user terminal, whether it is necessary to acquire a new timing advance according to the indication information,
如果所述指示信息指示所述用户终端使用已获得的定时提前量, 则所述 用户终端判定无需获取新的定时提前量, 如果所述指示信息指示所述用户终 端不能使用已获得的任何一个定时提前量, 则所述用户终端判定在所述新的 分量载波上需要发起随机接入以获得一个新的定时提前量; If the indication information indicates that the user terminal uses the obtained timing advance amount, the user terminal determines that it is not necessary to acquire a new timing advance amount, if the indication information indicates the user end The terminal cannot use any one of the timing advances that have been obtained, and the user terminal determines that random access needs to be initiated on the new component carrier to obtain a new timing advance amount;
在所述用户终端在一个新的分量载波上发送上行信号的步骤中, 在新的 分量载波上, 使用所述已获得的定时提前量确定上行定时, 并发送上行信号; 或者在所述新的分量载波上, 使用新的定时提前量确定上行定时, 并发送上 行信号。 In the step of the user terminal transmitting an uplink signal on a new component carrier, determining, on the new component carrier, the uplink timing using the obtained timing advance, and transmitting an uplink signal; or in the new On the component carrier, the new timing advance is used to determine the uplink timing and the uplink signal is transmitted.
7、 如权利要求 6所述的方法, 其中, 7. The method of claim 6, wherein
所述定时提前量的指示信息包含在所述基站为所述用户终端调度的新的 分量载波的无线资源控制信令中。 The indication information of the timing advance amount is included in radio resource control signaling of a new component carrier scheduled by the base station for the user equipment.
8、 如权利要求 1、 2、 3、 4、 6或 7所述的方法, 其中, 在所述用户终端 根据所述系统信息中的各分量载波的定时提前量的配置信息和 /或所述基站 发送的定时提前量的指示信息,决定是否需要获取新的定时提前量的步骤中, 当所述系统信息中包含所述定时提前量的配置信息、 并且所述基站也发 送了所述定时提前量的指示信息时, 所述用户终端优先根据所述定时提前量 的指示信息决定是否需要获取新的定时提前量。 8. The method according to claim 1, 2, 3, 4, 6 or 7, wherein: at the user terminal, according to configuration information of a timing advance amount of each component carrier in the system information, and/or the In the step of determining whether to acquire a new timing advance amount, the system information includes the timing advance amount configuration information, and the base station also sends the timing advance When the amount of indication information is obtained, the user terminal preferentially determines whether it is necessary to acquire a new timing advance amount according to the indication information of the timing advance amount.
9、 如权利要求 8所述的方法, 其中, 9. The method of claim 8 wherein
在所述用户终端判定需要获取新的定时提前量, 则在所述新的分量载波 上发起随机接入以获取新的定时提前量的步骤中, In the step of the user terminal determining that a new timing advance is required to be acquired, and then performing random access on the new component carrier to acquire a new timing advance,
釆用基于竟争的或基于非竟争的随机接入方式在所述新的分量载波上发 起随机接入; Generating random access on the new component carrier using a contention-based or non-contention based random access method;
在所述用户终端釆用基于非竟争的随机接入方式在所述新的分量载波上 发起随机接入的步骤中, In the step of the user terminal initiating random access on the new component carrier by using a non-contention based random access method,
所述基站通过为所述用户终端调度新的分量载波的无线资源控制信令指 示专用的随机接入前导和物理随机接入信道掩码, 所述用户终端根据所述随 机接入前导和物理随机接入信道掩码, 并结合所述新的分量载波上的随机接 入配置参数, 选择物理随机接入信道发送专用的随机接入前导。 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.
10、 如权利要求 8所述的方法, 其中, 10. The method of claim 8 wherein
在所述用户终端在所述新的分量载波上发起随机接入的步骤中, 基于对 时分双工模式下的新的分量载波、 或基于对频分双工模式下的新的上行分量 载波对应的下行分量载波的下行同步的子帧起始位置发送随机接入前导, 并 假设定时提前量为 0; In the step of the user terminal initiating random access on the new component carrier, based on The new component carrier in the time division duplex mode, or the random access preamble based on the downlink start position of the downlink component of the downlink component carrier corresponding to the new uplink component carrier in the frequency division duplex mode, and assumes timing advance The amount is 0;
在所述用户终端在所述新的分量载波上发送上行信号的步骤中, 根据所 述新的分量载波的下行定时和所述新的定时提前量确定上行定时。 In the 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.
11、 如权利要求 8所述的方法, 其中, 11. The method of claim 8, wherein
在所述用户终端在所述新的分量载波上发起随机接入的步骤中, 基于初 始接入所下行同步的子帧起始位置发送随机接入前导, 并假设定时提前量为 0; In the step of the user terminal initiating random access on the new component carrier, the random access preamble is sent based on the start position of the subframe in which the downlink synchronization is initially accessed, and the timing advance is assumed to be 0;
在所述用户终端在所述新的分量载波上发送上行信号的步骤中, 根据初 始接入的下行定时和所述新的定时提前量确定上行定时。 In the step of the user terminal transmitting an uplink signal on the new component carrier, the uplink timing is determined according to the downlink timing of the initial access and the new timing advance.
12、 一种用户终端, 所述用户终端设置为, 通过初始接入获取一个定时 提前量, 并读取基站广播的系统信息; 接收基站的调度信号后, 根据所述系 统信息中的各分量载波的定时提前量的配置信息和 /或所述基站发送的定时 提前量的指示信息, 决定是否需要获取新的定时提前量; 如果需要获取新的 定时提前量,则在所述新的分量载波上发起随机接入以获取新的定时提前量; 并在一个新的分量载波上发送上行信号。 12. 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 each component carrier in the system information The configuration information of the timing advance amount and/or the indication information of the timing advance amount sent by the base station determines whether a new timing advance amount needs to be acquired; if a new timing advance amount needs to be acquired, on the new component carrier Initiating random access to acquire a new timing advance; and transmitting an uplink signal on a new component carrier.
13、 如权利要求 12所述的用户终端, 其中, 13. The user terminal according to claim 12, wherein
所述各分量载波的定时提前量的配置信息包括本小区各分量载波是否使 用相同的定时提前量的信息; The configuration information of the timing advance of each component carrier includes information about whether the same timing advance amount is used by each component carrier of the current cell;
所述用户终端是设置为, 如果所述配置信息指示本小区各分量载波使用 相同的定时提前量, 则判定无需获取新的定时提前量, 在所述新的分量载波 上, 使用初始接入所上行同步的分量载波上的定时提前量确定上行定时, 并 发送上行信号; 如果所述配置信息指示本小区各分量载波使用不同的定时提 前量, 则判定需要获取新的定时提前量, 在所述新的分量载波上, 使用所述 新的定时提前量确定上行定时, 并发送上行信号。 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.
14、 如权利要求 12所述的用户终端, 其中, 14. The user terminal according to claim 12, wherein
所述各分量载波的定时提前量的配置信息包括本小区分量载波组的配置 信息, 使用相同的定时提前量的分量载波属于同一个分量载波组; The configuration information of the timing advance of each component carrier includes the configuration of the component carrier group of the local cell. Information, component carriers using the same timing advance amount belong to the same component carrier group;
所述用户终端是设置为, 根据所述配置信息, 将初始接入的分量载波所 属的分量载波组标记为已上行同步, 并将已获取的定时提前量作为该分量载 波组的定时提前量; 判断所述新的分量载波是否属于已上行同步的分量载波 组, 如果所述新的分量载波属于已上行同步的分量载波组, 则所述用户终端 判定无需获取新的定时提前量, 在所述新的分量载波上, 使用其所属的分量 载波组的定时提前量确定上行定时, 并发送上行信号; 如果所述新的分量载 波不属于已上行同步的任何一个分量载波组, 则所述用户终端判定需要获取 新的定时提前量; 在所述新的分量载波上, 使用所述新的定时提前量确定上 行定时, 并发送上行信号。 The user terminal is configured to mark, according to the configuration information, a component carrier group to which the initially accessed component carrier belongs as uplink synchronization, and use the acquired timing advance amount as a 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, and 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, On the new component carrier, the uplink timing is determined by using the timing advance of the component carrier group to which it belongs, and the uplink signal is sent; if the new component carrier does not belong to any component carrier group that has been uplink synchronized, the user terminal Determining that a new timing advance is required; on the new component carrier, determining the uplink timing using the new timing advance and transmitting an uplink signal.
15、 如权利要求 12所述的用户终端, 所述用户终端是设置为, 在所述系 统信息包含所述定时提前量的配置信息和所述基站也发送了定时提前量的指 示信息时, 优先根据所述定时提前量的指示信息决定是否需要获取新的定时 提前量。 The user terminal according to claim 12, wherein the user terminal is configured to: when the system information includes configuration information of the timing advance amount and indication information that the base station also transmits a timing advance amount, Determining whether it is necessary to acquire a new timing advance amount according to the indication information of the timing advance amount.
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