CN102761954A - Uplink synchronization method and uplink synchronization system in multi-carrier communication system - Google Patents
Uplink synchronization method and uplink synchronization system in multi-carrier communication system Download PDFInfo
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- 230000007774 longterm Effects 0.000 abstract description 5
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- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- 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
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Abstract
The invention discloses an uplink synchronization method in a multi-carrier communication system. The uplink synchronization method comprises the following steps of: indicating UE (User Equipment) to be in a state capable of receiving downlink information in a cell to be aggregated by a network side according to a current serving cell of the UE; sending uplink synchronization indicating time information of the uplink synchronization to the UE after the random access of the UE in the cell to be aggregated is finished by the network side; and normally carrying out uplink and downlink data receiving and sending after the uplink synchronization of the uplink synchronization indicating time information is finished in the cell to be aggregated by the UE. The invention simultaneously discloses an uplink synchronization system in the multi-carrier communication system. According to the uplink synchronization method and the uplink synchronization system, disclosed by the invention, the uplink synchronization of an auxiliary cell in an LTE (Long Term Evolution)-Advanced system is realized, and the method is simple and quick.
Description
Technical field
The present invention relates to a kind of uplink synchronous technology, relate in particular to the uplink synchronisation method and the system of auxilliary sub-district in a kind of multi-carrier communications systems.
Background technology
Senior Long Term Evolution (LTE-Advanced; Long Term Evolution Advanced) system is third generation partner program (3GPP; The 3rd Generation Partner Project) tissue is in order to satisfy (the ITU of International Telecommunications Union; The requirement of senior international mobile communication International Telecommunication Union), (IMT-Advanced, International Mobile Telecommunication-Advanced) and the standard released.The LTE-Advanced system is at Long Term Evolution (LTE; Long Term Evolution) an evolution version on the system-based; It has introduced the high-speed transfer demand that a lot of new technologies satisfy IMT-Advanced, and most important one is exactly carrier aggregation technology in the technology of being introduced.
Because the property in short supply of present radio spectrum resources, the frequency spectrum resource that each mobile operator of the world is had is often more scattered, and the index of peak rate is higher (supports 100Mbps under the high mobility and IMT-Advanced requires; Hypomobility is supported 1Gbps down); Bandwidth with the maximum 20MHz of present LTE standard far can not satisfy the IMT-Advanced requirement, need frequency band be extended to more high bandwidth; Such as 40MHz, 60MHz, in addition higher.To the discontinuous reality of present LTE-Advanced system's intermediate frequency spectrum resource, current technological means effectively is that several LTE frequency bands based on 20MHz are carried out bandwidth expansion through the mode of " carrier aggregation ".
Used in the LTE-Advanced system of carrier aggregation technology, the carrier wave of participating in polymerization is called as component carrier (Component Carrier), and subscriber equipment (UE, User Equipment) can be realized transfer of data simultaneously on a plurality of component carriers.The frequency range that component carrier can use LTE to define also can be used for the newly-increased specially frequency range of LTE-Advanced.Because at present frequency spectrum resource is nervous, can not always have component carrier continuous on the frequency domain to distribute to operator and use, so component carrier can be continuous on frequency band, also can be discontinuous.Introduced the notion of main plot and auxilliary sub-district in the carrier aggregation, the main plot refers to that UE initiates the sub-district that Radio Resource control (RRC, Radio Resource Control) connects foundation or RRC connection reconstruction or in handoff procedure, is designated as the main plot; Auxilliary sub-district is meant the frequency that is different from the main plot, and after UE gets into the RRC connection status sub-district that dispose, that be used to provide extra wireless resources.
After introducing carrier aggregation technology, UE can carry out transfer of data at a plurality of Serving cells simultaneously at RRC connected state (RRC_CONNECTED), but for the UE of Idle state (RRC_IDLE); As LTE, only can reside on the sub-district, UE is after successfully inserting on this sub-district; Be that UE is after setting up the RRC connection on this sub-district; According to service needed, the base station can be that UE distributes newly-increased sub-district through the special RRC signaling, distributes base station and the not enterprising line data transmitting-receiving in this newly-increased sub-district immediately of UE behind these newly-increased sub-districts; Be that business datum is not sent to UE in the base station on this newly-increased sub-district; UE preserves the configuration information on this sub-district, but currently on this sub-district, does not send business datum to the base station, but waits for the further activation indication of base station.Subsequent base stations can activate this sub-district according to service needed, and after this sub-district was activated, base station and UE could the enterprising line data transmitting-receivings in this sub-district.
In the LTE system; In order to realize and to keep the uplink synchronous between UE and the base station; Each UE is given according to the propagation delay time transmitting time lead between base station and each UE (TA, Timing Advance) in the base station, and the Timing Advance that UE sends according to the base station shifts to an earlier date the opportunity of uplink separately; Thereby remedy the propagation delay time of UE, make the upward signal of different UEs all within the receive window of base station, arrive the base station to the base station.
In the LTE system; In order to keep the uplink synchronous between UE and the base station, the base station be UE disposed a upstream synchronous timing device (TAT, TimeAlignmentTimer); If UE can receive the Timing Advance that the base station sends to UE before TAT is overtime; Then think to keep uplink synchronous between this UE and this base station, otherwise, think that UE loses uplink synchronous.At not synchronous regime or desynchronizing state; UE is through the uplink synchronous between random access procedure acquisition and the base station; After UE receives the accidental access response (Random Access Response) that sends the base station; Start timer TAT, and shift to an earlier date the opportunity of uplink in accidental access response according to the Timing Advance that carry the base station.After the uplink synchronous of UE acquisition and base station; At the TAT run duration,, then restart TAT if receive the TA order (TimeAlignment command) that the base station sends to UE; And use the Timing Advance that carries in the TA order to shift to an earlier date the uplink time, think that UE still keeps uplink synchronous with the base station; If UE does not receive the TA order at the TAT run duration; Be that TAT is when overtime; Think that UE and base station have lost uplink synchronous; Need the deletion dynamic assignment to give all up-downgoing resources of this UE, and empty all up mixed self-adapting retransmission buffer to be sent (HARQ buffer) data, notice RRC sublayer discharges static state/semi-static ascending physical signal resource of distributing to this UE; If after this there is upstream data need send or have downlink data to need to receive, UE need insert to regain uplink synchronous at first at random.
After introducing carrier aggregation, UE may be simultaneously operated on a plurality of Serving cells, and these Serving cells can be continuous on frequency band, also can be discontinuous; Can be in the identical frequency band, also can come from different frequency bands.For the discontinuous situation of Serving cell, perhaps Serving cell comes from the situation of different frequency bands, because each Serving cell has different transmission characteristics, the Timing Advance of each Serving cell maybe be different; Even each Serving cell belongs to identical frequency band and on frequency band continuously; If each Serving cell is derived from different Remote Radio Unit (RRU; Remote Radio Unit); Perhaps cover in order to increase the sub-district, each Serving cell is handled via different repeater (repeater) respectively, and then the Timing Advance on each Serving cell also maybe be different.In the LTE system, UE only is operated in that (for TDD mode is a carrier wave, comprises up, descending a pair of carrier wave for mode of frequency division duplexing on the carrier wave; For describing conveniently, abbreviate a carrier wave here as), only need safeguard the uplink synchronous of a up link; And in carrier aggregation; UE may be simultaneously operated on a plurality of Serving cells, and in the application scenarios of Rel-10, the TA of these Serving cells can think identical; After in system, having introduced radio frequency and zooming out (RRH, Remote Radio Head) and repeater, the TA of these Serving cells might be different.Therefore when UE is in the RRC connection status,, some does not send upstream data on accomplishing the sub-district of uplink synchronous, can cause losing of data.To this situation, to make that how activating this Serving cell after a certain Serving cell is accomplished up initial synchronisation and completion synchronously is the problem of needing solution in the multi-carrier aggregation system badly on what opportunity on.
Summary of the invention
In view of this, main purpose of the present invention is to provide uplink synchronisation method and system in a kind of multi-carrier communications systems, can when the sub-district is assisted in the UE interpolation, make this auxilliary sub-district to be added realize uplink synchronous quickly and easily.
For achieving the above object, technical scheme of the present invention is achieved in that
Uplink synchronisation method in a kind of multi-carrier communications systems comprises:
Network side indicates said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of UE;
Said network side sends uplink synchronous information instruction time that is used for uplink synchronous to said UE said UE accomplishes access at random in the sub-district of treating polymerization after;
Said UE accomplishes uplink synchronous in said uplink synchronous instruction time in the sub-district of treating polymerization.
Preferably, said UE is in the state that can receive downstream message in the sub-district of treating polymerization, for:
Said UE can receive the condition of information that random access procedure uses in the sub-district of treating polymerization;
Perhaps, said UE can receive the state of all downstream messages in the sub-district of treating polymerization.
Preferably, said network side indicates said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of UE, for:
Said network side sends being used for that physical layer signaling by PDCCH carries through the current Serving cell of UE to said UE and indicates said UE to be in the Indication message that can receive downstream message in the sub-district of treating polymerization; Carry said UE in the said Indication message and insert the said random access resource information of treating the sub-district of polymerization at random.
Preferably, after said UE received said Indication message, said method also comprised:
Said UE direct entering in the sub-district of treating polymerization can receive the state of downstream message, and initiates random access procedure in the said sub-district of polymerization of treating to said network side according to said random access resource information;
Perhaps, said UE initiates random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and gets into the state that can receive downstream message simultaneously;
Perhaps, said UE initiates random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and after receiving the accidental access response of said network side, gets into the state that can receive downstream message.
Preferably, said network side indicates said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of UE, for:
Said network side sends to said UE and carries the Indication message that activates the MAC control element.
Preferably, after said UE received said Indication message, said method also comprised:
Said UE gets into the state that can receive downstream message in the sub-district of treating polymerization, and selects random access resource information to initiate random access procedure in the said sub-district of polymerization of treating to said network side voluntarily;
Perhaps, said UE selects random access resource information to initiate random access procedure in the said sub-district of polymerization of treating to said network side voluntarily, and gets into the state that can receive downstream message in the sub-district of treating polymerization.
Preferably, said UE accomplishes uplink synchronous in said sub-district of treating polymerization after, method also comprises:
Said UE sends Physical Uplink Shared Channel PUSCH message in the said sub-district of polymerization of treating to the base station, notifies the said sub-district of polymerization of treating of said network side to accomplish uplink synchronous; Wherein, carry the said Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI, Cell Radio Network Temporary Identifier) of treating the sub-district of polymerization in the said PUSCH message.
Uplink synchronous system in a kind of multi-carrier communications systems comprises network side and UE, wherein,
Network side is used for indicating said UE to be in the state that can receive downstream message in the sub-district of treating polymerization through the current Serving cell of UE; And, said UE accomplishes access at random in the sub-district of treating polymerization after, send uplink synchronous information instruction time that is used for uplink synchronous to said UE;
UE is used for accomplishing uplink synchronous in the sub-district of treating polymerization instruction time in said uplink synchronous.
Preferably, said UE is in the state that can receive downstream message in the sub-district of treating polymerization, for:
Said UE can receive the condition of information of using in the random access procedure in the sub-district of treating polymerization;
Perhaps, said UE can receive the state of all downstream messages in the sub-district of treating polymerization.
Preferably, said network side is further used for, and sends being used for that physical layer signaling by PDCCH carries through the current Serving cell of UE to said UE and indicates said UE to be in the Indication message that can receive downstream message in the sub-district of treating polymerization; Carry said UE in the said Indication message and insert the said random access resource information of treating the sub-district of polymerization at random.
Preferably, said UE is further used for after receiving said Indication message,
Direct entering can receive the state of downstream message in treating the sub-district of polymerization, and initiates random access procedure in the said sub-district of polymerization of treating to said network side according to said random access resource information;
Perhaps, initiate random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and get into the state that can receive downstream message simultaneously;
Perhaps, initiate random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and after receiving the accidental access response of said network side, get into the state that can receive downstream message.
Preferably, said network side is further used for, and sends to said UE and carries the Indication message that activates the MAC control element.
Preferably, said UE is further used for after receiving said Indication message:
Get into the state that can receive downstream message in the sub-district of treating polymerization, and select random access resource information to initiate random access procedure to said network side voluntarily in the said sub-district of polymerization of treating;
Perhaps, select random access resource information to initiate random access procedure to said network side voluntarily, and get into the state that can receive downstream message in the sub-district of treating polymerization in the said sub-district of polymerization of treating.
Among the present invention; In the time need assisting sub-district (treating the sub-district of polymerization) for the UE activation; Network side at first need indicate said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of UE; Send the random access resource that is used for inserting at random to this UE then,, make UE accomplish random access procedure in auxilliary sub-district to be added like random access lead code.Network side will be used to indicate UE in this auxilliary cell uplink to be added synchronous uplink synchronous instruction time (TA) through accidental access response etc. again, make UE accomplish uplink synchronous in this auxilliary sub-district to be added, get into up-downgoing normal data reiving/transmitting state.The present invention has realized that the auxilliary cell uplink in the LTE-Advanced system is synchronous, and mode is simple and quick.
Description of drawings
Fig. 1 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention one;
Fig. 2 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention two;
Fig. 3 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention three;
Fig. 4 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention four;
Fig. 5 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention five;
Fig. 6 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention six.
Embodiment
Basic thought of the present invention is: in the time need assisting sub-district (treating the sub-district of polymerization) for the UE interpolation; Network side at first need indicate said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of UE; Send the resource that is used for inserting at random to this UE then; Like random access lead code, make UE accomplish random access procedure in auxilliary sub-district to be added.Network side will be used to indicate UE in this auxilliary cell uplink to be added synchronous uplink synchronous instruction time (TA) through accidental access response etc. again, make UE accomplish uplink synchronous in this auxilliary sub-district to be added.
For understanding the present invention better, technical scheme of the present invention is done further explain.
Provide the definition of two states among the present invention:
State 1: Serving cell begins downlink data and receives; Can be only limited to RACH (RACH; Random Access Channel) Physical Downlink Control Channel (PDCCH of msg2, msg4 in the process; Physical Downlink Control Channel) and physical layer descending shared channel (PDS CH; Physical Downlink shared Channel) receives, perhaps can allow to receive all PDCCH message and PDSCH message of line correlations down, think the Serving cell down-going synchronous at this moment.That is, state 1 time, UE can realize that above-mentioned msg2, msg4 message and PDSCH that PDCCH carries go up the msg2 that carries and the reception of msg4 message, maybe can receive all message of PDCCH and PDSCH carrying.
State 2: Serving cell begins the transmission of comprehensive downlink data reception and upstream data; And UE can send interception reference signal (SRS, Sounding Reference Signal), report physical layer metrical information (CQI (Channel Quality Indicator)/PMI (Precoding Matrix Indicator)/RI (Rank Index)) to the base station on this Serving cell.
Technical scheme of the present invention provides two kinds of implementation methods; Wherein, The technical scheme that method one relates to is: when UE is in the RRC connection status; The initial uplink of base station or certain auxilliary Serving cell of UE initiation is synchronous, and this auxilliary Serving cell gets the hang of 1, and the initial uplink of this sub-district of initiation, base station need not send the MAC control element to UE when synchronous.UE is in the uplink synchronous process of receiving this Serving cell of indication back initiation.This Serving cell got the hang of 2 after synchronizing process was accomplished.Perhaps UE directly gets the hang of 2 without state 1.The performing step of this method can be used for reference the synchronous implementation procedure of LTE system, therefore can effectively reduce the synchronous complexity of cell uplink.
The technical scheme that method two relates to is: when UE is in the RRC connection status; The MAC control element that activates auxilliary Serving cell is sent to a certain auxilliary Serving cell of uplink synchronous that needs in the base station; UE should get the hang of 1 by auxilliary Serving cell after using the MAC control element, next can begin immediately this Serving cell is carried out uplink synchronous.The promoter of synchronizing process can be the base station, also can be subscriber equipment.After this Serving cell was accomplished the uplink synchronous process, this auxilliary Serving cell got the hang of 2.
Through the present invention, the opportunity of up initial synchronisation can clearly be initiated in user terminal and base station to a certain Serving cell; Subscriber equipment can be confirmed on this Serving cell, to intercept downstream signal, send interception reference signal, reports opportunity of physical layer metrical information (CQI/PMI/RI) to the base station.
Among the present invention, after being in state 1, for follow-up downstream message, network side can send through the UE current service cell, also can send through this sub-district of treating polymerization.Wait to be in after the state 2, UE is sent to the upstream message of network side, both can send through the former Serving cell of UE, also can be through the sub-district transmission of treating polymerization of uplink synchronous.
Below, through concrete example, further illustrate the essence of technical scheme of the present invention.
Among the present invention, be that example is described with FDD (FDD, Frequency Division Duplex) pattern.The implementation that it will be appreciated by those skilled in the art that time division duplex (TDD, Time Division Duplex) pattern also is identical, gives unnecessary details no longer one by one.
Among the present invention,, be called CC1 (DL f1, UL f1 ') with Serving cell 1 (descending frequency f1, up frequency f1 '); With Serving cell 2 (descending frequency f2, up frequency f2 '), be called CC2 (DL f2, UL f2 '), CC1 (DL f1, UL f1 ') and CC2 (DL f2, UL f2 ') can carry out carrier aggregation.UE is in the RRC connection status at present on CC1 (current service cell), promptly UE is current has the uplink and downlink data to transmit at CC1.When UE need be when the enterprising industry of a plurality of Serving cells be engaged in transmission, another one Serving cell (being assumed to be CC2) can directly dispose random access resource through network side, and CC2 need carry out initial uplink earlier before carrying out transmitting uplink data synchronous.Among the present invention, UE and base station (network side) safeguarded the uplink synchronisation on each Serving cell respectively.
Fig. 1 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention one, and as shown in Figure 1, uplink synchronisation method specifically may further comprise the steps in the multi-carrier communications systems of this example:
Step 101; When CC2 needed uplink synchronous, Indication message was sent to UE in the base station on CC1, as sending physical layer signaling (carrying said Indication message) through the PDCCH channel; This physical layer signaling is the physical layer signaling of existing P DCCH order or redetermination; Carry CC2 random access resource information (like random access code) in this Indication message, and in message, indicate in this message the information of carrying and use, as indicating and use through carrying carrier wave ID by CC2 by CC2.
Step 102, UE gets the hang of 1 after receiving this message; Promptly beginning to receive data in CC2 descending (allows UE that certain processing delay is arranged, promptly after receiving this message in k the transmission time slot interval (TTI, Transmission Timing Interval); K is specified by agreement; For example, k=4 can be set for LTE FDD system), lead code and resource with the base station indication on CC2 are initiated to begin random access procedure in the time of appointment;
Perhaps, UE is after receiving this message, and lead code and resource with the base station indication on CC2 are initiated to begin the RACH process in the time of appointment, and get the hang of 1 at the moment CC2 that initiates to insert at random.
Perhaps, UE is after receiving this message, and lead code and resource with the base station indication on CC2 are initiated to begin random access procedure in the time of appointment, and when accepting accidental access response (Random Access Response), CC2 gets the hang of 1.CC2 gets the hang of 1, and promptly UE gets the hang of 1 in CC2.
Perhaps, after UE receives this message, get the hang of 2, on CC2, initiate the RACH process then.
Step 103, base station are sent accidental access response message to UE on CC2 after receiving this lead code that inserts at random, carry synchronous adjustment (TA) information in this message.
Step 104, UE uses the uplink synchronous process of synchronous adjustment information (TA) the completion CC2 in the accidental access response message, and CC2 gets the hang of 2.
Fig. 2 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention two, and as shown in Figure 2, uplink synchronisation method specifically may further comprise the steps in the multi-carrier communications systems of this example:
Step 201, when CC2 needed uplink synchronous, UE initiated random access procedure on CC2, adopted the common preamble sign indicating number.
Step 202, base station are sent accidental access response message to UE after receiving this lead code, carry synchronous adjustment information in this message.
Step 203, UE uses the synchronous adjustment information (TA) in the accidental access response message, and CC2 gets the hang of 1, and sends upstream message to the base station, carries the C-RNTI of UE.
Step 204, the base station manages conflict, and replys conflict solution message to UE.
Step 205, UE receives that conflict solves message, accomplishes the uplink synchronous of CC2, gets the hang of 2.
Fig. 3 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention three, and as shown in Figure 3, uplink synchronisation method specifically may further comprise the steps in the multi-carrier communications systems of this example:
Step 301, when CC2 needed uplink synchronous, message was sent to UE in the base station on CC1, and this message is carried and is activated the MAC control element.The uplink synchronous indication of CC2 can be adopted latent showing and explicit two modes.Implicit expression mode: promptly CC2 is carried out uplink synchronous after activating CC2; Display mode: carry the synchronous sign of indication CC2 in the control element.
Step 302, UE uses this MAC control element, and CC2 gets the hang of 1.
Indication message can be sent to UE in the base station on CC2; Like the physical layer signaling that sends through the PDCCH channel; This physical layer signaling can be the physical layer signaling of existing P DCCH order or redetermination, carries the CC2 random access information in this message, like lead code etc.
Step 303, UE adopts the lead code of base station assigns and random access resource on CC2, to initiate to insert at random;
Step 304, base station are sent accidental access response message to UE on CC2, wherein comprise the TA adjustment information of CC2.
Step 305, UE receives accidental access response message, and CC2 uses this TA, accomplishes the initial uplink synchronizing process of CC2, and this moment, CC2 got the hang of 2.
Fig. 4 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention four, and as shown in Figure 4, uplink synchronisation method specifically may further comprise the steps in the multi-carrier communications systems of this example:
Step 401, when CC2 needed uplink synchronous, message was sent to subscriber equipment in the base station on CC1, and this message is carried and is activated the MAC control element.The uplink synchronous indication of CC2 can be adopted latent showing and explicit two modes.Implicit expression mode: promptly CC2 is carried out uplink synchronous after activating CC2; Display mode: carry the synchronous sign of indication CC2 in the control element.
Step 402, the MAC control element in the UE application message, CC2 gets the hang of 1.UE selects random access lead code on CC2, to initiate the RACH process voluntarily;
Perhaps, UE uses this MAC control element, and selects random access lead code on CC2, to initiate the RACH process voluntarily, and this moment, CC2 got the hang of 1.
Step 403, base station are sent accidental access response message to UE after receiving the lead code that UE sends on CC2, carry time adjustment information TA in the message;
Step 404, UE uses this TA value at CC2 after receiving accidental access response message,, this moment, CC2 got the hang of 2.
Step 405; Because also do not know that CC2 initiates random access procedure as the auxilliary Serving cell of UE and accomplishes uplink synchronous base station this moment; So this moment, UE can send up PUSCH message to the base station on CC2; And in message, comprising the C-RNTI sign of UE, this is that a CC2 accomplishes the uplink synchronous process as auxilliary Serving cell for an informing base station;
Step 406, base station are received UE after the PUSCH message of sending on the CC2, according to the C-RNTI information that comprises in the message learn reason that UE initiates random access procedure be for the initial uplink of setting up CC2 synchronous.The base station can according to circumstances be sent downlink data or indicate UE uplink authorization information UE on CC2.
Step 407, UE accomplishes the uplink synchronous of CC2.
Fig. 5 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention five, and as shown in Figure 5, uplink synchronisation method specifically may further comprise the steps in the multi-carrier communications systems of this example:
Step 501, when CC2 needed uplink synchronous, message was sent to subscriber equipment in the base station on CC1, and this message is carried and is activated the MAC control element.The uplink synchronous indication of CC2 can be adopted latent showing and explicit two modes.Wherein, the implicit expression mode can for: promptly CC2 is carried out uplink synchronous after activating CC2; Display mode can for: carry indication CC2 synchronous sign in the control element.
Step 502, the MAC control element in the UE application message gets the hang of 1.If disposed cross-scheduling this moment, carry the CC2 random access information in the physical layer signaling (can be the physical layer signaling of existing P DCCH order or redetermination) that the base station can be sent through the PDCCH channel on CC1, like lead code.
Step 503 after UE has received the PDCCH message of carrying lead code at CC1, adopts the lead code that obtains to initiate random access procedure on CC2;
Step 504, base station are sent accidental access response message to UE after receiving lead code on CC2, carry time adjustment information TA in the message;
Step 505, UE uses this TA value at CC2 after receiving accidental access response message, the synchronous completion of CC2 at this moment, CC2 gets the hang of 2.
Fig. 6 is the flow chart of uplink synchronisation method in the multi-carrier communications systems of the embodiment of the invention six, and as shown in Figure 6, uplink synchronisation method specifically may further comprise the steps in the multi-carrier communications systems of this example:
Step 601, when CC2 needed uplink synchronous, message was sent to subscriber equipment in the base station on CC1, and this message is carried and is activated the MAC control element.The uplink synchronous indication of CC2 can be adopted latent showing and explicit two modes.Implicit expression mode: promptly CC2 is carried out uplink synchronous after activating CC2; Display mode: carry the synchronous sign of indication CC2 in the control element.The base station is carried the preamble information that CC2 initiates random access procedure simultaneously in this message;
Step 602, the MAC control element in the UE application message, CC2 gets the hang of 1.UE uses and on CC2, initiates random access procedure in the lead code of receiving on the CC1;
Step 603, base station are sent accidental access response message to UE after receiving lead code on CC2, carry time adjustment information TA in the message;
Step 604, UE uses this TA value at CC2 after receiving accidental access response message, the synchronous completion of CC2 at this moment, CC2 gets the hang of 2.
The present invention has put down in writing uplink synchronous system in a kind of multi-carrier communications systems simultaneously, comprises network side and UE, wherein,
Network side is used for indicating said UE to be in the state that can receive downstream message in the sub-district of treating polymerization through the current Serving cell of UE; And, said UE accomplishes access at random in the sub-district of treating polymerization after, send uplink synchronous information instruction time that is used for uplink synchronous to said UE;
UE is used for accomplishing uplink synchronous in the sub-district of treating polymerization instruction time in said uplink synchronous.
Above-mentioned UE is in the state that can receive downstream message in the sub-district of treating polymerization, for:
Said UE can receive the condition of information of using in the random access procedure in the sub-district of treating polymerization;
Perhaps, said UE can receive the state of all downstream messages in the sub-district of treating polymerization, and promptly current UE has realized down-going synchronous in treating the sub-district of polymerization, can receive all downstream messages of network side.
Said network side is further used for, and sends being used for that physical layer signaling by PDCCH carries through the current Serving cell of UE to said UE and indicates said UE to be in the Indication message that can receive downstream message in the sub-district of treating polymerization; Carry said UE in the said Indication message and insert the said random access resource information of treating the sub-district of polymerization at random.
Said UE is further used for after receiving said Indication message,
Direct entering can receive the state of downstream message in treating the sub-district of polymerization, and initiates random access procedure in the said sub-district of polymerization of treating to said network side according to said random access resource information;
Perhaps, initiate random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and get into the state that can receive downstream message simultaneously;
Perhaps, initiate random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and after receiving the accidental access response of said network side, get into the state that can receive downstream message.
Perhaps, said network side is further used for, and sends to said UE and carries the Indication message that activates the MAC control element.Said UE is further used for after receiving said Indication message:
Get into the state that can receive downstream message in the sub-district of treating polymerization, and select random access resource information to initiate random access procedure to said network side voluntarily in the said sub-district of polymerization of treating;
Perhaps, select random access resource information to initiate random access procedure to said network side voluntarily, and get into the state that can receive downstream message in the sub-district of treating polymerization in the said sub-district of polymerization of treating.
It will be appreciated by those skilled in the art that in the multi-carrier communications systems of the present invention the details of the function of each network element in the uplink synchronous system, can understand referring to the associated description of uplink synchronisation method in the aforementioned multi-carrier communications systems.The uplink synchronous system does not have change to the existing network system in the multi-carrier communications systems of the present invention, but the function of wherein related network elements is expanded.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (13)
1. uplink synchronisation method in the multi-carrier communications systems is characterized in that said method comprises:
Network side indicates said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of user equipment (UE);
Said network side sends uplink synchronous information instruction time that is used for uplink synchronous to said UE said UE accomplishes access at random in the sub-district of treating polymerization after;
Said UE accomplishes uplink synchronous in said uplink synchronous instruction time in the sub-district of treating polymerization.
2. method according to claim 1 is characterized in that, said UE is in the state that can receive downstream message in the sub-district of treating polymerization, for:
Said UE can receive the condition of information that random access procedure uses in the sub-district of treating polymerization;
Perhaps, said UE can receive the state of all downstream messages in the sub-district of treating polymerization.
3. method according to claim 1 and 2 is characterized in that, said network side indicates said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of UE, for:
Said network side sends being used for that physical layer signaling by PDCCH carries through the current Serving cell of UE to said UE and indicates said UE to be in the Indication message that can receive downstream message in the sub-district of treating polymerization; Carry said UE in the said Indication message and insert the said random access resource information of treating the sub-district of polymerization at random.
4. method according to claim 3 is characterized in that, after said UE received said Indication message, said method also comprised:
Said UE direct entering in the sub-district of treating polymerization can receive the state of downstream message, and initiates random access procedure in the said sub-district of polymerization of treating to said network side according to said random access resource information;
Perhaps, said UE initiates random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and gets into the state that can receive downstream message simultaneously;
Perhaps, said UE initiates random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and after receiving the accidental access response of said network side, gets into the state that can receive downstream message.
5. method according to claim 1 and 2 is characterized in that, said network side indicates said UE in the sub-district of treating polymerization, to be in the state that can receive downstream message through the current Serving cell of UE, for:
Said network side sends to said UE and carries the Indication message that activates the MAC control element.
6. method according to claim 5 is characterized in that, after said UE received said Indication message, said method also comprised:
Said UE gets into the state that can receive downstream message in the sub-district of treating polymerization, and selects random access resource information to initiate random access procedure in the said sub-district of polymerization of treating to said network side voluntarily;
Perhaps, said UE selects random access resource information to initiate random access procedure in the said sub-district of polymerization of treating to said network side voluntarily, and gets into the state that can receive downstream message in the sub-district of treating polymerization.
7. method according to claim 6 is characterized in that, said UE accomplishes uplink synchronous in said sub-district of treating polymerization after, method also comprises:
Said UE sends Physical Uplink Shared Channel PUSCH message in the said sub-district of polymerization of treating to the base station, notifies the said sub-district of polymerization of treating of said network side to accomplish uplink synchronous; Wherein, carry the said Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI that treats the sub-district of polymerization in the said PUSCH message.
8. uplink synchronous system in the multi-carrier communications systems comprises network side and UE, it is characterized in that:
Network side is used for indicating said UE to be in the state that can receive downstream message in the sub-district of treating polymerization through the current Serving cell of UE; And, said UE accomplishes access at random in the sub-district of treating polymerization after, send uplink synchronous information instruction time that is used for uplink synchronous to said UE;
UE is used for accomplishing uplink synchronous in the sub-district of treating polymerization instruction time in said uplink synchronous.
9. system according to claim 8 is characterized in that, said UE is in the state that can receive downstream message in the sub-district of treating polymerization, for:
Said UE can receive the condition of information of using in the random access procedure in the sub-district of treating polymerization;
Perhaps, said UE can receive the state of all downstream messages in the sub-district of treating polymerization.
10. according to Claim 8 or 9 described systems; It is characterized in that; Said network side is further used for, and sends being used for that physical layer signaling by PDCCH carries through the current Serving cell of UE to said UE and indicates said UE to be in the Indication message that can receive downstream message in the sub-district of treating polymerization; Carry said UE in the said Indication message and insert the said random access resource information of treating the sub-district of polymerization at random.
11. system according to claim 10 is characterized in that, said UE is further used for after receiving said Indication message,
Direct entering can receive the state of downstream message in treating the sub-district of polymerization, and initiates random access procedure in the said sub-district of polymerization of treating to said network side according to said random access resource information;
Perhaps, initiate random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and get into the state that can receive downstream message simultaneously;
Perhaps, initiate random access procedure in the said sub-district of polymerization of treating to said network side in the time of appointment according to said random access resource information, and after receiving the accidental access response of said network side, get into the state that can receive downstream message.
12. according to Claim 8 or 9 described systems, it is characterized in that said network side is further used for, send to said UE and carry the Indication message that activates the MAC control element.
13. system according to claim 12 is characterized in that, said UE is further used for after receiving said Indication message:
Get into the state that can receive downstream message in the sub-district of treating polymerization, and select random access resource information to initiate random access procedure to said network side voluntarily in the said sub-district of polymerization of treating;
Perhaps, select random access resource information to initiate random access procedure to said network side voluntarily, and get into the state that can receive downstream message in the sub-district of treating polymerization in the said sub-district of polymerization of treating.
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| CN201110111834.6A CN102761954B (en) | 2011-04-29 | 2011-04-29 | Uplink synchronisation method and system in multi-carrier communications systems |
| PCT/CN2012/074471 WO2012146154A1 (en) | 2011-04-29 | 2012-04-20 | Uplink synchronization method and system in multi-carrier communication system |
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| CN201110111834.6A CN102761954B (en) | 2011-04-29 | 2011-04-29 | Uplink synchronisation method and system in multi-carrier communications systems |
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Also Published As
| Publication number | Publication date |
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| CN102761954B (en) | 2017-09-29 |
| WO2012146154A1 (en) | 2012-11-01 |
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