CN101646234A - Obtaining method of timing lead - Google Patents
Obtaining method of timing lead Download PDFInfo
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- CN101646234A CN101646234A CN200910161920A CN200910161920A CN101646234A CN 101646234 A CN101646234 A CN 101646234A CN 200910161920 A CN200910161920 A CN 200910161920A CN 200910161920 A CN200910161920 A CN 200910161920A CN 101646234 A CN101646234 A CN 101646234A
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- 238000004220 aggregation Methods 0.000 claims description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 230000004931 aggregating effect Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
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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
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- 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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Abstract
The invention discloses an obtaining method of timing lead, which is applied to a carrier wave aggregating system; the method comprises: a user terminal obtains a timing lead through initial access, and system information broadcasted by a cell base station is read; the user terminal determines weather a new timing lead is needed to obtain according to configuration information of the timing lead of each carrier component in the system information, and/or indication information for transmitting the timing lead by the base station, when the base station dispatches the user terminal to transmit an uplink signal on a new carrier component; if yes, random access is initiated on the new carrier component to obtain a new timing lead. By adopting the method, flexible configuration of same timing lead or different timing leads adopted on different carrier components based on the cell or the user terminal is realized, and pay expenses of uplink-synchronization establishment and maintenance suchas random access are reduced at the same time.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of acquisition methods of Timing Advance.
Background technology
3GPP LTE (The 3rd Generation Partnership Project Long Term Evolution, third generation partner program Long Term Evolution) system uplink adopts SC-FDMA (single-carrier frequency division multiple access) transmission technology, in order to satisfy user terminal (User Equipment, abbreviation UE) orthogonality between the upward signal, must guarantee that each UE upward signal arrives the time unanimity of base station receiving terminal, i.e. uplink synchronous.Uplink synchronous can adopt different Timing Advance (Timing AdvanceCommand by base stations control UE, be called for short TA) realize, UE promptly far away apart from the base station, that propagation delay is bigger early sends, the later transmission of the UE nearer apart from the base station, that propagation delay is less, thus make the upward signal of each UE arrive the base station receiving terminal substantially simultaneously.Suitable timing advance TA is adopted by MAC layer signaling indication UE in the base station.
UE can obtain Timing Advance by initiating to insert at random (Random Access) from the accidental access response (Random Access Response) of base station; Also can obtain the renewal of Timing Advance by the MAC layer signaling (Timing Advance Command MAC control element) that the base station sends.Wherein, the Timing Advance in the accidental access response is 11bits, indicates new up timing (uplink timing); Timing Advance among the Timing Advance Command MAC control element is 6bits, and indication is to the adjustment of current up timing.
The acquisition methods of Timing Advance in the accidental access response below is described.
At first, user terminal is set up the synchronous and Frequency Synchronization of downgoing time by Cell searching and cell base station, obtains descending timing (downlink timing).Then, read system information (System Information) on Physical Broadcast Channel (Physical BroadcastChannel, be called for short PBCH) and the Physical Downlink Shared Channel (Physical Downlink SharedChannel, abbreviation PDSCH).
The system information of LTE system is divided into Master Information Block (Master Information Block is called for short MIB) and a series of system information block (System Information Blocks is called for short SIBs).Wherein, Master Information Block (MIB) comprises some the most basic system informations, comprises the configuration information, System Frame Number of downlink system bandwidth, physical down HARQ (mix automatically and retransmit) indicating channel (PHICH) etc.Master Information Block (MIB) sent in Physical Broadcast Channel (PBCH) the last cycle.System information block (SIBs) is divided into 11 classes (SystemInformationBlockType 1～11) according to content, and sends on Physical Downlink Shared Channel.Wherein, SystemInformationBlockType2 (SIB-2) has comprised the wireless resource configuration (Radio Resource Configuration Information) of this sub-district, comprising carrier frequency information, the up-link bandwidth of up-link carrier, and insert configuration parameter at random.
Finish down-going synchronous and obtain after the system information user terminal initiation access at random.By inserting at random, user terminal and cell base station are set up up time synchronized, obtain Timing Advance.According to the difference that takies the resource mode, (contention based) that random access procedure is divided into again based on competition inserts at random and inserts at random based on non-competing (non-contention based).
As shown in Figure 1, the random access procedure based on competition was divided into for four steps:
(1) UE is according to the configuration parameter of access at random among the system information block SIB-2, select Physical Random Access Channel (Physical Random Access Channel, be called for short PRACH) to base station eNg (evolved Node B, the Node B of evolution) sends random access guiding (Random AccessPreamble, be called Message 1 again, be abbreviated as Msg 1).
So-called access at random based on competition, promptly the random access guiding option set of base station configuration is that a plurality of user terminals are shared in the sub-district.
Random access guiding sends (suppose that Timing Advance is 0 this moment) based on subframe (subframe) position of down-going synchronous.Specifically, for Frequency Division Duplexing (FDD) (Frequency Division Duplex is called for short FDD) pattern, random access guiding begins to send in the subframe original position of down-going synchronous; For time division duplex (Time Division Duplex, be called for short TDD) pattern, random access guiding form 0～3 (preamble format 0～3) begins to send in the subframe original position of down-going synchronous, and random access guiding format 4 (preamble format 4) begins to send at preceding 5158 Ts of the end position of the time slot UpPTS of down-going synchronous (uplink pilot time slot).Wherein, Ts=1/ (15000 * 2048) second.
(2) after the base station detects random access guiding, utilize random access leader sequence wherein, calculate Timing Advance.As shown in Figure 2, Timing Advance has comprised the propagation delay (propagation delay) of uplink and downlink links, and multidiameter delay (multipath delay).Timing Advance sends through Physical Downlink Shared Channel together with some other signaling information, is called accidental access response (be called Message 2 again, be abbreviated as Msg 2).
(3) user terminal is after receiving accidental access response, according in the accidental access response corresponding to the Timing Advance of the random access guiding of its transmission, on the basis of the subframe original position of down-going synchronous, shifting to an earlier date corresponding a period of time sends first dispatching uplink transmission (First scheduled UL transmission, be called Message 3 again, be abbreviated as Msg 3).Msg 3 includes different information according to the incident difference that triggers this random access procedure.
(4) as previously mentioned, to the random access procedure based on competition, a plurality of user terminals may be selected identical random access guiding from shared random access guiding option set, and have selected identical Random Access Channel.The base station also will solve message (ContentionResolution is called Message 4 again, is abbreviated as Msg 4) to user terminal by its content feed competition after receiving Msg 3, to solve the collision problem that may occur.
Then can be divided into for two steps based on non-competing random access procedure, be similar to first two steps based on the random access procedure of competition.But in (1) step, user terminal is according to the configuration parameter of access at random among the system information block SIB-2, and the configuration of high-level signaling, selects Physical Random Access Channel to send random access guiding.Specifically, the high-level signaling explicitly provides the random access guiding of a special use, and a Physical Random Access Channel mask (PRACH Mask index).User terminal on a definite Physical Random Access Channel, or is selected a Physical Random Access Channel according to this mask in one group of Physical Random Access Channel that limits, send special-purpose random access guiding.
The transmission timing of random access guiding is with the same based on the random access procedure of competition, and the subframe original position that is based on down-going synchronous sends (supposing that Timing Advance is 0).
User terminal can be determined up timing according to descending timing and Timing Advance after confirming to insert successfully at random, and then sends upward signal.Like this, although different user terminals may be arranged in the diverse location of sub-district, propagated time delay and multidiameter delay have nothing in common with each other, and the time that the upward signal that user terminal sends arrives the base station receiving terminal is the same.
Along with moving of user terminal, perhaps the moving of scattering object in the communication environments, user terminal changes with the distance between cell base station, communication environments changes, propagation delay and multidiameter delay also change thereupon, the base station sends Timing Advance by MAC layer signaling and upgrades to user terminal, current up timing is adjusted, to keep uplink synchronous.
LTE-Advanced system (Long Term Evolution-Advanced is called for short the LTE-A system) is the evolution system of future generation of LTE system.As shown in Figure 3, the LTE-A system adopts carrier aggregation (Carrier Aggregation claims carrier wave to assemble again) technological expansion transmission bandwidth, to obtain higher data rate.The carrier wave of each polymerization is called one " component carrier " (Component Carrier).Component carrier can be continuous on frequency spectrum, also can be discontinuous; Same frequency range (frequency band) can be positioned at, also different frequency ranges can be positioned at.
On on the different component carriers/descending propagation delay may be identical with multidiameter delay, also may be different, the factor of influence comprises: the frequency interval between component carrier, if bigger at interval, even being positioned at different frequency ranges, the dissemination channel characteristic of different component carriers may be different; And the transceiver locations of component carrier, if different component carrier uses different antennas, and it wire spacing is bigger, propagation delay and multidiameter delay also may be different.
Therefore, in the carrier aggregation system different with the system of the single carrier wave of prior art, how user terminal obtains the Timing Advance on the different component carriers, to keep uplink synchronous, and reduce simultaneously to become a problem demanding prompt solution by inserting the expense of setting up uplink synchronous at random.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of acquisition methods of Timing Advance, can be applicable in the carrier aggregation system, makes user terminal can obtain Timing Advance on the different component carriers, to keep uplink synchronous.
In order to address the above problem, the invention provides a kind of acquisition methods of Timing Advance, comprising:
User terminal inserts by initial, obtains a Timing Advance, and reads the system information of cell base station broadcasting;
When the described user terminal of described base station scheduling sends upward signal on a new component carrier, the indication information of the Timing Advance that described user terminal sends according to the configuration information of the Timing Advance of each component carrier in the described system information and/or described base station, whether decision needs to obtain new Timing Advance; If desired, then on described new component carrier, initiate to insert at random to obtain new Timing Advance.
Further, the configuration information of the Timing Advance of described each component carrier comprises whether each component carrier of this sub-district uses the information of identical Timing Advance;
When described user terminal determines that according to described configuration information whether needs obtain new Timing Advance, each component carrier uses identical Timing Advance if described configuration information is indicated this sub-district, then described user terminal judgement need not to obtain new Timing Advance, on described new component carrier, use the Timing Advance on the component carrier that initially inserts institute's uplink synchronous to determine up timing, and then send upward signal; Each component carrier uses different Timing Advances if described configuration information is indicated this sub-district, then described user terminal is judged need obtain new Timing Advance, and on described new component carrier, use described new Timing Advance to determine up timing, and then send upward signal.
Further, the configuration information of the Timing Advance of described each component carrier comprises the configuration information of this sub-district component carrier group, uses the component carrier of identical Timing Advance to belong to same component carrier group;
Described user terminal is according to described configuration information, the component carrier group echo under the component carrier that initially inserts is uplink synchronous, and the Timing Advance that will obtain is as the Timing Advance of this component carrier group;
When described user terminal determines that according to described configuration information whether needs obtain new Timing Advance, judge whether described new component carrier belongs to certain component carrier group of uplink synchronous, if described new component carrier belongs to certain component carrier group of uplink synchronous, then described user terminal judgement need not to obtain new Timing Advance, and on described new component carrier, use the Timing Advance of its affiliated component carrier group to determine up timing, and then send upward signal; If described new component carrier does not belong to any one component carrier group of uplink synchronous, then described user terminal is judged need obtain new Timing Advance, and on described new component carrier, use described new Timing Advance to determine up timing, and then send upward signal.
Further, after described user terminal is being initiated on the described new component carrier to insert at random and is being obtained new Timing Advance, in the configuration information with described component carrier group, component carrier group echo under the described new component carrier is uplink synchronous, and the described new Timing Advance that will obtain is as the Timing Advance of this component carrier group.
Further, the configuration information of described Timing Advance is included in the system information block that comprises cell radio resource configuration information or cell carrier aggregation configuration information, and described system information block sends on Physical Downlink Shared Channel.
Further, the indication information of described Timing Advance comprises that the described user terminal of indication uses acquired certain Timing Advance, perhaps can not use the information of acquired any one Timing Advance;
When described user terminal determines that according to described indication information whether needs obtain new Timing Advance, if described indication information indicates described user terminal to use acquired certain Timing Advance, then described user terminal judgement need not to initiate to insert at random on this new component carrier, on new component carrier, use described acquired Timing Advance to determine up timing, and then send upward signal; If described indication information indicates described user terminal can not use acquired any one Timing Advance, then described user terminal is judged to be needed to initiate to insert at random to obtain a new Timing Advance on described new component carrier, and on described new component carrier, use new Timing Advance to determine up timing, and then send upward signal.
Further, the indication information of described Timing Advance is included in the radio resource control signaling that described base station is the new component carrier of described scheduling of user terminals.
Further, when the configuration information that comprises described Timing Advance in the described system information and described base station had sent the indication information of described Timing Advance again, described user terminal preferentially was as the criterion with the indication information of described Timing Advance.
Further, judge need obtain new Timing Advance the time when described user terminal, adopt based on competition or on described new component carrier, initiates access at random based on non-competing access way at random; When described user terminal adopts based on non-competing access way at random, described base station is by special-purpose random access guiding and the Physical Random Access Channel mask of radio resource control signaling indication for the new component carrier of described scheduling of user terminals, described user terminal is according to described random access guiding and Physical Random Access Channel mask, and, select Physical Random Access Channel to send special-purpose random access guiding in conjunction with the configuration parameter of access at random on the described new component carrier.
Further, when described user terminal initiates to insert at random on described new component carrier, based on sending random access guiding to the new component carrier under the TDD mode or to the subframe original position based on the down-going synchronous of the downlink component carrier of the new upstream components carrier wave correspondence under the mode of frequency division duplexing, and the hypothesis Timing Advance is 0;
When described user terminal sends upward signal on described new component carrier, determine up timing according to the descending timing and the described new Timing Advance of described new component carrier.
Further, when described user terminal initiates to insert at random, send random access guiding based on the initial subframe original position that inserts institute's down-going synchronous, and the hypothesis Timing Advance is 0 on described new component carrier;
When described user terminal sends upward signal on described new component carrier, determine up timing according to the descending timing and the described new Timing Advance of initial access.
The acquisition methods of the Timing Advance in the carrier aggregation system provided by the invention on the different component carriers, can realize based on the identical or flexible configuration of different timing lead on (cell-specific) of sub-district or (UE-specific) different component carriers, the expense that uplink synchronous is set up and kept such as reduce to insert at random simultaneously based on user terminal.
Description of drawings
Fig. 1 is the schematic diagram of LTE system based on the random access procedure of competition;
Fig. 2 is the schematic diagram of Timing Advance;
Fig. 3 is a LTE-A system carrier aggregation schematic diagram.
Embodiment
The acquisition methods of the Timing Advance in the carrier aggregation system provided by the invention on the different component carriers, can be in the following way:
(1) configuration information of the Timing Advance of each component carrier is carried in the base station in system information, and for example, whether each component carrier of this sub-district uses the information of identical Timing Advance.
The described system information that is used to indicate each component carrier whether to use identical Timing Advance is 1 bit, and this bit information is that 0 (or 1) represents that each component carrier uses identical Timing Advance, is that different Timing Advances is used in 1 (or 0) expression.
The configuration information of described Timing Advance can be carried among the system information block SIB that comprises cell radio resource configuration information or cell carrier aggregation configuration information, and described SIB sends on Physical Downlink Shared Channel.
Described each component carrier is meant the component carrier under the tdd mode, or the upstream components carrier wave under the fdd mode.
Under the tdd mode, described system information is broadcasted on all component carriers or part component carrier; Under the fdd mode, described system information is broadcasted on all downlink component carriers or part downlink component carrier.
User terminal obtains a Timing Advance, and reads the system information of base station broadcast by initial insert (initial access), comprises whether each component carrier of sub-district uses the information of identical Timing Advance.
User terminal is determined up timing according to Timing Advance on the component carrier of uplink synchronous, send upward signal.
When the base station scheduling user terminal sends upward signal on a new component carrier, user terminal is according to the configuration information of the Timing Advance of each component carrier in the described system information, whether decision needs to obtain new Timing Advance, if desired, then on new component carrier, initiate to insert at random.
Each component carrier uses identical Timing Advance if described configuration information is indicated this sub-district, and then user terminal need not to initiate to insert at random on new component carrier.User terminal uses the Timing Advance on the component carrier that initially inserts institute's uplink synchronous to determine up timing on new component carrier, and then sends upward signal.
Each component carrier uses different Timing Advances if described configuration information is indicated this sub-district, and then user terminal needs to initiate to insert at random to obtain a new Timing Advance on new component carrier.User terminal uses new Timing Advance to determine up timing on new component carrier, and then sends upward signal.
(2) configuration information of the Timing Advance of each component carrier is carried in the base station in system information, for example, indicates which component carrier of this sub-district to use identical Timing Advance.
The described system information that is used to indicate which component carrier to use identical Timing Advance is the configuration information of component carrier group, use the component carrier of identical Timing Advance to form the one-component carrier wave set, use the component carrier of different timing lead to belong to different component carrier groups.Each component carrier group has the one-component carrier wave at least.
The configuration of described Timing Advance can be carried among the system information block SIB that comprises cell radio resource configuration information or cell carrier aggregation configuration information, and described SIB sends on Physical Downlink Shared Channel.
Described component carrier is meant the component carrier under the tdd mode, or the upstream components carrier wave under the fdd mode.
Under the tdd mode, described system information is broadcasted on all component carriers or part component carrier; Under the fdd mode, described system information is broadcasted on all downlink component carriers or part downlink component carrier.
User terminal inserts by initial, obtains a Timing Advance, and reads the system information of base station broadcast, comprises which component carrier of sub-district uses the information of identical Timing Advance.
User terminal is on the component carrier of uplink synchronous, and the up timing according to Timing Advance is determined sends upward signal.
User terminal is according to the configuration information of component carrier group, and the component carrier group echo under the component carrier of uplink synchronous is uplink synchronous, and with the Timing Advance that the obtains Timing Advance as this component carrier group.
When the base station scheduling user terminal sends upward signal on a new component carrier, user terminal is according to the configuration information of the Timing Advance of each component carrier in the described system information, it is the configuration information of component carrier group, judge whether new component carrier belongs to certain component carrier group of uplink synchronous, whether decision need be initiated to insert at random on new component carrier.
If new component carrier belongs to certain component carrier group of uplink synchronous, then user terminal need not to initiate to insert at random on new component carrier.User terminal uses the Timing Advance of its affiliated component carrier group to determine up timing on new component carrier, and then sends upward signal.
If new component carrier does not belong to any one component carrier group of uplink synchronous, then user terminal needs to initiate to insert at random to obtain a new Timing Advance on new component carrier.After random access procedure is finished,, the component carrier group echo under this component carrier is uplink synchronous, and the new Timing Advance that will obtain is as the Timing Advance of this component carrier group according to the configuration information of component carrier group.User terminal uses new Timing Advance to determine up timing on new component carrier, and then sends upward signal.
(3) base station is to the indication information of user terminal transmission Timing Advance, and indicating user terminal uses acquired certain Timing Advance of this user terminal, perhaps can not use acquired any one Timing Advance.
User terminal inserts by initial, obtains a Timing Advance.
On the component carrier of uplink synchronous, the up timing that user terminal is determined according to Timing Advance sends upward signal.
When the base station scheduling user terminal sent upward signal on a new component carrier, indicating user terminal used acquired certain Timing Advance of this user terminal, perhaps can not use acquired any one Timing Advance.
If the base station indicating user terminal uses acquired certain Timing Advance, then user terminal need not to initiate to insert at random on this new component carrier according to described indication information decision; User terminal uses the Timing Advance of described indication information indication to determine up timing, and then sends upward signal on new component carrier.
If the base station indicating user terminal can not use acquired any one Timing Advance, then user terminal initiates to insert at random to obtain a new Timing Advance according to described indication information needs on new component carrier.User terminal uses new Timing Advance to determine up timing on new component carrier, and then sends upward signal.
Above-mentioned indication information can send to user terminal for RRC (Radio Resource Control, the Radio Resource control) signaling of the new component carrier of scheduling of user terminals by the base station.
To sum up, method () and method (two) are based on (cell-specific) of sub-district, and method (three) is based on (UE-specific) of user terminal.Wherein, method () and method (three), perhaps method (two) and method (three) can be used, and to certain component carrier, are higher than configuration information based on the Timing Advance of sub-district based on the indication information priority of the Timing Advance of user terminal.For example, when configuration information based on the Timing Advance of sub-district has been indicated in the base station in system information, whether use identical Timing Advance as each component carrier, or which component carrier of this sub-district uses identical Timing Advance, when in the RRC signaling certain user terminal being obtained Timing Advance and indicate on certain component carrier again, this user terminal should be to be as the criterion based on the indication in the RRC signaling of user terminal.
When the base station scheduling user terminal sends upward signal on a new component carrier, and user terminal need initiate to insert at random on new component carrier when obtaining new Timing Advance, user terminal can adopt based on competition or based on non-competing access way at random.When user terminal adopts based on non-competing access at random, the random access guiding and the Physical Random Access Channel mask (PRACH Mask index) of the RRC signaling indication special use of base station by giving the new component carrier of this scheduling of user terminals.User terminal selects Physical Random Access Channel to send special-purpose random access guiding in conjunction with the configuration parameter of access at random on the new component carrier.
On new component carrier, user terminal can send random access guiding (supposing that Timing Advance is 0) based on the subframe original position to downlink component carrier (fdd mode) down-going synchronous of this component carrier (tdd mode) or this upstream components carrier wave correspondence.User terminal is determined up timing on each component carrier according to separately descending timing and Timing Advance on each new component carrier, and then sends the upward signal on each component carrier.
So-called subframe original position based on down-going synchronous sends random access guiding (supposing that Timing Advance is 0), is meant for fdd mode, and random access guiding begins to send in the subframe original position of down-going synchronous; For tdd mode, random access guiding form 0～3 begins to send in the subframe original position of down-going synchronous, and the random access guiding format 4 begins to send at preceding 5158 Ts of the end position of the time slot UpPTS of down-going synchronous.Wherein, Ts=1/ (15000 * 2048) second.
On new component carrier, user terminal also can send random access guiding (supposing that Timing Advance is 0) based on the initial subframe original position that inserts institute's down-going synchronous.User terminal is being determined up timing on each component carrier according to the Timing Advance on the descending timing of initial access and the component carrier that each is new on each new component carrier, and then sends upward signal.
Describe the present invention in detail below in conjunction with embodiment and accompanying drawing.
Embodiment one
Suppose the LTE-A system of a carrier aggregation, be operated under the tdd mode that 5 component carrier CC 1～5 are arranged.
The base station indicates each component carrier of this sub-district to use different Timing Advances with 1 bit (this bit is 1) in the system information of each component carrier.
User terminal is when initial the access, on CC1, finish earlier down-going synchronous and access at random, obtain descending timing DL timing1, and timing advance TA 1, and read system information on the CC1, comprise the 1bit configuration information of each component carrier Timing Advance in the system information.
User terminal is on the component carrier CC1 of uplink synchronous, and the up timing according to descending timing DL timing1 and timing advance TA 1 are determined sends upward signal.
When the base station scheduling user terminal sent upward signal on CC3, user terminal was according to the configuration information of each component carrier Timing Advance in the described system information, and decision need be initiated to insert at random on CC3.
User terminal is finished down-going synchronous earlier on CC3, obtain descending timing DL timing3, and read the system information on the CC3.According to the configuration parameter of access at random in the system information, on CC3, initiate random access procedure again, obtain a new timing advance TA 3 based on competition.
Perhaps, when user terminal is given at scheduling CC3 in the base station, special-purpose random access guiding and Physical Random Access Channel mask (PRACH Mask index) in the RRC signaling, have been disposed.User terminal initiates to obtain a new timing advance TA 3 based on non-competing random access procedure on CC3 in conjunction with the configuration parameter of access at random on the CC3.
User terminal is determined up timing according to descending timing DL timing3 and new timing advance TA 3, and then is sent upward signal on new component carrier.
Embodiment two
Suppose the LTE-A system of a carrier aggregation, be operated under the fdd mode that 2 downlink component carrier D1 are arranged, D2 and 2 upstream components carrier wave U1, U2.
The base station indicates this sub-district each component carrier to use identical Timing Advance with 1 bit (this bit is 0) at D1 in the system information of D2 (or only at D1).
The family terminal is when initial the access, on D1 and U1, finish earlier down-going synchronous and access at random, obtain descending timing DL timing1, and timing advance TA 1, and read system information on the D1, comprise the 1bit configuration information of each component carrier Timing Advance in the system information.
User terminal is on the U1 of uplink synchronous, and the up timing according to descending timing DL timing1 and timing advance TA 1 are determined sends upward signal.
When the base station scheduling user terminal sent upward signal on U2, user terminal was according to the configuration information of each component carrier Timing Advance in the described system information, and decision need not initiated to insert at random on U2.
User terminal is finished down-going synchronous earlier on D2, obtain descending timing DL timing2, and read the system information on the D2.
User terminal is on U2, and the up timing according to descending timing DL timing2 and timing advance TA 1 are determined sends upward signal.
Perhaps, D1, D2 and U1, U2 are strict Time and Frequency Synchronization, and then user terminal is on U2, and the up timing according to descending timing DL timing1 on the D1 and the timing advance TA on the U1 1 are determined sends upward signal.
Embodiment three
Suppose the LTE-A system of a carrier aggregation, be operated under the tdd mode that 4 component carrier CC 0～3 are arranged.Wherein, CC0 has identical Timing Advance with CC1, is component carrier group 0; CC2 has identical Timing Advance with CC3, is component carrier group 1.
The base station indicates which component carrier of this sub-district to use identical Timing Advance in the system information of each component carrier.Particularly, can indicate CC0 and CC1 in cell radio resource configuration information or cell carrier aggregation configuration information is component carrier group 0; CC2 and CC3 are component carrier group 1.
User terminal is when initial the access, on CC3, finish earlier down-going synchronous and access at random, obtain descending timing DL timing3, and timing advance TA 3, and read system information on the CC3, the configuration information that comprises the Timing Advance of each component carrier in the system information, the i.e. configuration information of component carrier group.
User terminal is according to the configuration information of component carrier group, and the component carrier group 1 under the CC3 of uplink synchronous is labeled as uplink synchronous, and with the timing advance TA 3 that the obtains Timing Advance as this component carrier group.
User terminal is on the CC3 of uplink synchronous, and the up timing according to descending timing DL timing3 and timing advance TA 3 are determined sends upward signal.
When the base station scheduling user terminal sent upward signal on CC2, user terminal judged that according to the configuration information of described component carrier group CC2 belongs to the component carrier group 1 of uplink synchronous, and decision need not initiated to insert at random on CC2.
User terminal is finished down-going synchronous earlier on CC2, obtain descending timing DL timing2, and read the system information on the CC2.
User terminal is on CC2, and the up timing according to descending timing DL timing2 and timing advance TA 3 are determined sends upward signal.
Perhaps, CC3, CC2 are strict Time and Frequency Synchronization, and then user terminal is on CC2, and the up timing according to descending timing DL timing3 on the CC3 and the timing advance TA on the CC3 3 are determined sends upward signal.
When the base station scheduling user terminal sent upward signal on CC0 (or CC1), user terminal judged that according to the configuration information of described component carrier group CC0 does not belong to the component carrier group 1 of uplink synchronous, and decision need be initiated to insert at random on CC0.
User terminal is finished down-going synchronous earlier on CC0, obtain descending timing DL timing0, and read the system information on the CC0.According to the configuration parameter of access at random in the system information, on CC0, initiate random access procedure again, obtain a new timing advance TA 0 based on competition.
Perhaps, when user terminal is given at scheduling CC0 in the base station, special-purpose random access guiding and Physical Random Access Channel mask (PRACH Mask index) in the RRC signaling, have been disposed.User terminal initiates to obtain a new timing advance TA 0 based on non-competing random access procedure on CC0 in conjunction with the configuration parameter of access at random on the CC0.
User terminal is according to the configuration information of component carrier group, and the component carrier group 0 under the CC0 of uplink synchronous is labeled as uplink synchronous, and with the timing advance TA 0 that the obtains Timing Advance as this component carrier group.
User terminal is on CC0, and the up timing according to descending timing DL timing0 and timing advance TA 0 are determined sends upward signal.
Embodiment four
Suppose the LTE-A system of a carrier aggregation, be operated under the fdd mode that 3 downlink component carrier D0 are arranged, D1, D2 and 2 upstream components carrier wave U0, U1, U2.
The family terminal is finished earlier down-going synchronous and access at random on D1 and U1 when initial the access, obtain descending timing DL timing1, and timing advance TA 1, and reads the system information on the D1.
User terminal is determined up timing according to descending timing DL timing1 and timing advance TA 1 on the U1 of uplink synchronous, send upward signal.
When the base station scheduling user terminal sends upward signal on U2, on U2, can not use acquired any one Timing Advance of this user terminal by RRC signaling indicating user terminal.User terminal need initiate to insert at random on U2.
User terminal is finished earlier down-going synchronous on D2, obtain subframe original position DL timing2, and reads the system information on the D2.According to the configuration parameter of access at random in the system information, on U2, initiate random access procedure again, obtain a new timing advance TA 2 based on competition.
Perhaps, when user terminal is given at scheduling U2 in the base station, special-purpose random access guiding and Physical Random Access Channel mask (PRACH Mask index) in the RRC signaling, have been disposed.User terminal initiates to obtain a new timing advance TA 2 based on non-competing random access procedure on U2 in conjunction with the configuration parameter of access at random on the D2.
User terminal is determined up timing according to descending timing DL timing2 and timing advance TA 2 on U2, send upward signal.
When the base station scheduling user terminal sends upward signal on U0, on U0, use the acquired timing advance TA 1 of this user terminal by RRC signaling indicating user terminal.User terminal need not initiate to insert at random on U0.
User terminal is finished down-going synchronous earlier on D0, obtain descending timing DL timing0, and read the system information on the D0.
User terminal is determined up timing according to the timing advance TA 1 of descending timing DL timing0 and signaling indication on U0, send upward signal.
Perhaps, D1, D0 are strict Time and Frequency Synchronization, and then user terminal is on U0, and the TA1 that indicates according to descending timing DL timing1 on D1 and signaling determines up timing, sends upward signal.
Embodiment five
Suppose the LTE-A system of a carrier aggregation, be operated under the tdd mode that 5 component carrier CC 0～4 are arranged.Wherein, CC0 has identical Timing Advance with CC1, is component carrier group 0; CC2 is a component carrier group 1; CC3 has identical Timing Advance with CC4, is component carrier group 2.
The base station indicates which component carrier of this sub-district to use identical Timing Advance in the system information of each component carrier.Specifically, be that indication CC0 and CC1 are component carrier group 0 in cell radio resource configuration information or cell carrier aggregation configuration information; CC2 is a component carrier group 1; CC3 and CC4 are component carrier group 2.
User terminal is when initial the access, on CC0, finish earlier down-going synchronous and access at random, obtain descending timing DL timing0, and timing advance TA 0, and read system information on the CC0, the configuration information that comprises the Timing Advance of each component carrier in the system information, the i.e. configuration information of component carrier group.
User terminal is according to the configuration information of component carrier group, and the component carrier group 0 under the CC0 of uplink synchronous is labeled as uplink synchronous, and with the timing advance TA 0 that the obtains Timing Advance as this component carrier group.
User terminal is determined up timing according to descending timing DL timing0 and timing advance TA 0 on the CC0 of uplink synchronous, send upward signal.
When the base station scheduling user terminal sent upward signal on CC1, user terminal judged that according to the configuration information of described component carrier group CC1 belongs to the component carrier group 0 of uplink synchronous, and decision need not initiated to insert at random on CC1.
User terminal is finished down-going synchronous earlier on CC1, obtain descending timing DL timing1, and read the system information on the CC1.
User terminal is determined up timing according to descending timing DL timing1 and timing advance TA 0 on CC1, send upward signal.
Perhaps, CC0, CC1 are strict Time and Frequency Synchronization, and then user terminal is determined up timing according to descending timing DL timing0 on the CC0 and the timing advance TA on the CC0 0 on CC1, sends upward signal.
When the base station scheduling user terminal sent upward signal on CC2, user terminal judged that according to the configuration information of described component carrier group CC2 does not belong to the component carrier group 0 of uplink synchronous, and decision need be initiated to insert at random on CC3.
User terminal is finished down-going synchronous earlier on CC2, obtain descending timing DL timing2, and read the system information on the CC2.According to the configuration parameter of access at random in the system information, on CC2, initiate random access procedure again, obtain a new timing advance TA 2 based on competition.
Perhaps, when user terminal is given at scheduling CC2 in the base station, special-purpose random access guiding and Physical Random Access Channel mask (PRACH Mask index) in the RRC signaling, have been disposed.User terminal initiates to obtain a new timing advance TA 2 based on non-competing random access procedure on CC2 in conjunction with the configuration parameter of access at random on the CC2.
User terminal is according to the configuration information of component carrier group, and the component carrier group 1 under the CC2 of uplink synchronous is labeled as uplink synchronous, and with the timing advance TA 2 that the obtains Timing Advance as this component carrier group.
User terminal is determined up timing according to descending timing DL timing2 and timing advance TA 2 on CC2, send upward signal.
When the base station scheduling user terminal sent upward signal on CC3, user terminal judged that according to the configuration information of described component carrier group CC3 does not belong to the component carrier group 0 or the component carrier group 1 of uplink synchronous, and decision need be initiated to insert at random on CC3.
User terminal is finished down-going synchronous earlier on CC3, obtain descending timing DL timing3, and read the system information on the CC3.According to the configuration parameter of access at random in the system information, on CC3, initiate random access procedure again, obtain a new timing advance TA 3 based on competition.
Perhaps, when user terminal is given at scheduling CC3 in the base station, special-purpose random access guiding and Physical Random Access Channel mask (PRACH Mask index) in the RRC signaling, have been disposed.User terminal initiates to obtain a new timing advance TA 3 based on non-competing random access procedure on CC3 in conjunction with the configuration parameter of access at random on the CC3.
User terminal is according to the configuration information of component carrier group, and the component carrier group 2 under the CC3 of uplink synchronous is labeled as uplink synchronous, and with the timing advance TA 3 that the obtains Timing Advance as this component carrier group.
User terminal is determined up timing according to descending timing DL timing3 and timing advance TA 3 on CC3, send upward signal.
When the base station scheduling user terminal sends upward signal on CC4, on CC4, can not use acquired any one Timing Advance of this user terminal (TA0, TA2, or TA3) by RRC signaling indicating user terminal.User terminal need initiate to insert at random on CC4.
User terminal is finished down-going synchronous earlier on CC4, obtain descending timing DL timing4, and read the system information on the CC4.According to the configuration parameter of access at random in the system information, on CC4, initiate random access procedure again, obtain a new timing advance TA 4 based on competition.
Perhaps, when user terminal is given at scheduling CC4 in the base station, special-purpose random access guiding and Physical Random Access Channel mask (PRACH Mask index) in the RRC signaling, have been disposed.User terminal initiates to obtain a new timing advance TA 4 based on non-competing random access procedure on CC4 in conjunction with the configuration parameter of access at random on the CC4.
User terminal is determined up timing according to descending timing DL timing4 and timing advance TA 4 on CC4, send upward signal.
Embodiment six
Suppose the LTE-A system of a carrier aggregation, be operated under the tdd mode that 5 component carrier CC 1～5 are arranged.
The base station indicates each component carrier of this sub-district to use different Timing Advances with 1 bit (this bit is 1) in the system information of each component carrier.
User terminal is when initial the access, on CC1, finish earlier down-going synchronous and access at random, obtain descending timing DL timing1, and timing advance TA 1, and read system information on the CC1, comprise the 1bit configuration information of each component carrier Timing Advance in the system information.
User terminal is determined up timing according to descending timing DL timing1 and timing advance TA 1 on the CC1 of uplink synchronous, send upward signal.
When the base station scheduling user terminal sent upward signal on CC3, user terminal was according to described system information, and decision need be initiated to insert at random on CC3.
Obtained the configuration parameter of access at random on the CC3 the system information of user terminal from CC1, on CC3, sent random access guiding, initiated random access procedure, obtained a new timing advance TA 3 based on competition based on DL timing1.
Perhaps, when user terminal is given at scheduling CC3 in the base station, in the RRC signaling, disposed the configuration parameter of access at random on the CC3, special-purpose random access guiding and Physical Random Access Channel mask (PRACHMask index).User terminal sends random access guiding based on DL timing1 on CC3, initiate to obtain a new timing advance TA 3 based on non-competing random access procedure.
User terminal is on CC3, and descending timing DL timing1 and timing advance TA 3 during according to initial the access are determined up timing, send upward signal.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (11)
1, a kind of acquisition methods of Timing Advance is characterized in that, comprising:
User terminal inserts by initial, obtains a Timing Advance, and reads the system information of cell base station broadcasting;
When the described user terminal of described base station scheduling sends upward signal on a new component carrier, the indication information of the Timing Advance that described user terminal sends according to the configuration information of the Timing Advance of each component carrier in the described system information and/or described base station, whether decision needs to obtain new Timing Advance; If desired, then on described new component carrier, initiate to insert at random to obtain new Timing Advance.
2, the method for claim 1 is characterized in that,
The configuration information of the Timing Advance of described each component carrier comprises whether each component carrier of this sub-district uses the information of identical Timing Advance;
When described user terminal determines that according to described configuration information whether needs obtain new Timing Advance, each component carrier uses identical Timing Advance if described configuration information is indicated this sub-district, then described user terminal judgement need not to obtain new Timing Advance, on described new component carrier, use the Timing Advance on the component carrier that initially inserts institute's uplink synchronous to determine up timing, and then send upward signal; Each component carrier uses different Timing Advances if described configuration information is indicated this sub-district, then described user terminal is judged need obtain new Timing Advance, and on described new component carrier, use described new Timing Advance to determine up timing, and then send upward signal.
3, the method for claim 1 is characterized in that,
The configuration information of the Timing Advance of described each component carrier comprises the configuration information of this sub-district component carrier group, uses the component carrier of identical Timing Advance to belong to same component carrier group;
Described user terminal is according to described configuration information, the component carrier group echo under the component carrier that initially inserts is uplink synchronous, and the Timing Advance that will obtain is as the Timing Advance of this component carrier group;
When described user terminal determines that according to described configuration information whether needs obtain new Timing Advance, judge whether described new component carrier belongs to certain component carrier group of uplink synchronous, if described new component carrier belongs to certain component carrier group of uplink synchronous, then described user terminal judgement need not to obtain new Timing Advance, and on described new component carrier, use the Timing Advance of its affiliated component carrier group to determine up timing, and then send upward signal; If described new component carrier does not belong to any one component carrier group of uplink synchronous, then described user terminal is judged need obtain new Timing Advance, and on described new component carrier, use described new Timing Advance to determine up timing, and then send upward signal.
4, method as claimed in claim 3 is characterized in that,
After described user terminal is being initiated on the described new component carrier to insert at random and is being obtained new Timing Advance, in the configuration information with described component carrier group, component carrier group echo under the described new component carrier is uplink synchronous, and the described new Timing Advance that will obtain is as the Timing Advance of this component carrier group.
5, as claim 2,3 or 4 described methods, it is characterized in that,
The configuration information of described Timing Advance is included in the system information block that comprises cell radio resource configuration information or cell carrier aggregation configuration information, and described system information block sends on Physical Downlink Shared Channel.
6, the method for claim 1 is characterized in that,
The indication information of described Timing Advance comprises that the described user terminal of indication uses acquired certain Timing Advance, perhaps can not use the information of acquired any one Timing Advance;
When described user terminal determines that according to described indication information whether needs obtain new Timing Advance, if described indication information indicates described user terminal to use acquired certain Timing Advance, then described user terminal judgement need not to initiate to insert at random on this new component carrier, on new component carrier, use described acquired Timing Advance to determine up timing, and then send upward signal; If described indication information indicates described user terminal can not use acquired any one Timing Advance, then described user terminal is judged to be needed to initiate to insert at random to obtain a new Timing Advance on described new component carrier, and on described new component carrier, use new Timing Advance to determine up timing, and then send upward signal.
7, method as claimed in claim 6 is characterized in that,
The indication information of described Timing Advance is included in the radio resource control signaling that described base station is the new component carrier of described scheduling of user terminals.
8, as claim 1,2,3,4, each described method of 6 or 7, it is characterized in that,
When the configuration information that comprises described Timing Advance in the described system information and described base station had sent the indication information of described Timing Advance again, described user terminal preferentially was as the criterion with the indication information of described Timing Advance.
9, method as claimed in claim 8 is characterized in that,
Judge need obtain new Timing Advance the time when described user terminal, adopt based on competition or on described new component carrier, initiates access at random based on non-competing access way at random; When described user terminal adopts based on non-competing access way at random, described base station is by special-purpose random access guiding and the Physical Random Access Channel mask of radio resource control signaling indication for the new component carrier of described scheduling of user terminals, described user terminal is according to described random access guiding and Physical Random Access Channel mask, and, select Physical Random Access Channel to send special-purpose random access guiding in conjunction with the configuration parameter of access at random on the described new component carrier.
10, method as claimed in claim 8 is characterized in that,
When described user terminal initiates to insert at random on described new component carrier, based on sending random access guiding to the new component carrier under the TDD mode or to the subframe original position based on the down-going synchronous of the downlink component carrier of the new upstream components carrier wave correspondence under the mode of frequency division duplexing, and the hypothesis Timing Advance is 0;
When described user terminal sends upward signal on described new component carrier, determine up timing according to the descending timing and the described new Timing Advance of described new component carrier.
11, method as claimed in claim 8 is characterized in that,
When described user terminal initiates to insert at random, send random access guiding based on the initial subframe original position that inserts institute's down-going synchronous, and the hypothesis Timing Advance is 0 on described new component carrier;
When described user terminal sends upward signal on described new component carrier, determine up timing according to the descending timing and the described new Timing Advance of initial access.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910161920A CN101646234A (en) | 2009-09-01 | 2009-09-01 | Obtaining method of timing lead |
| PCT/CN2010/074807 WO2011026377A1 (en) | 2009-09-01 | 2010-06-30 | Method and user equipment (ue) for obtaining timing advance command (ta) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910161920A CN101646234A (en) | 2009-09-01 | 2009-09-01 | Obtaining method of timing lead |
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