CN104113906A - Method and system for configuring synchronization new-type carriers in LT-A system - Google Patents
Method and system for configuring synchronization new-type carriers in LT-A system Download PDFInfo
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Abstract
The invention discloses a method and system for configuring synchronization new-type carriers in an LT-A system and belongs to the wireless communication field. The method includes the following steps that: user equipment receives a carrier identification message from a base station, wherein the carrier identification message is used for identifying synchronization new-type carriers and is adopted to perform detection processing and initial synchronization processing on the synchronization new-type carriers; when the user equipment detects the existence of the synchronization new-type carriers and is in initial synchronization with the synchronization new-type carriers, the user equipment transmits a synchronization new-type carrier successful identification massage to the base station, so that the synchronization new-type carriers can be configured as auxiliary component carries, otherwise, the user equipment transmits a synchronization new-type carrier failed identification massage to the base station, so that the base station can transmit a synchronization new-type carrier identification massage again until the user equipment detects the existence of synchronization new-type carriers and is in initial synchronization with the synchronization new-type carriers. With the method and system of the invention adopted, normal access of the synchronization new-type carriers can be realized when synchronization signals and cell-specific reference signals are not transmitted.
Description
Technical field
The present invention relates to wireless communication field, particularly collocation method and the related system of the synchronous newtype carrier wave in senior Long Term Evolution (Long Term Evolution Advanced, LTE-A) system carrier aggregation scene.
Background technology
In order to meet the technical requirement file of the IMT-Advanced of International Telecommunication Union, 3GPP has submitted the technical requirements document of LTE-Advanced to International Telecommunication Union in 2009, and formally relevant Work Item in LTE-A is set up the project, wherein just comprise carrier aggregation technology.LTE-A is the evolution version of LTE, except meeting or exceeding 3GPP TR25.913: all related needs of " Requirements for Evolved UTRA(E-UTRA) demand of universal land radio access web of the access of and Evolved UTRAN(evolved universal terrestrial wireless and evolution) ", also will meet or exceed the demand of the advanced person world mobile communication that International Telecommunication Union proposes.Wherein refer to the demand of LTE backward compatibility: the terminal of LTE can be in the network work of LTE-A, and the terminal of LTE-A can be worked in the network of LTE.Carrier aggregation can form larger bandwidth by two or more the carrier aggregation on a base station together, and the maximum bandwidth after polymerization is 100MHz.In addition, carrier aggregation support continuous with discrete component carrier (Component Carrier, CC), each component carrier has at most 100 Resource Block (Resource Block, RB) in frequency.In the carrier wave of polymerization, the carrier wave of setting up Radio Resource control (Radio Resource Control, RRC) connection becomes principal component carrier wave, and remaining carrier wave becomes auxiliary component carrier.
This non-backward compatible carrier waves is also referred to as newtype carrier wave (New Carrier Type, NCT), the one-component carrier wave that this newtype carrier wave can only be served as in carrier aggregation uses, concentrate and should have at least one-component carrier wave to work alone at the carrier wave of this polymerization, carrier wave is concentrated to a rare backward compatibility carrier wave.That is to say, this newtype carrier wave can not use separately, and LTE user can not use this newtype carrier wave.The thinking of newtype carrier wave design is to reduce the transmission of reference signal and control channel as far as possible, has so just saved overhead, has improved energy utilization efficiency; In addition, on newtype carrier wave, reduce the reference signal or the control channel that even do not transmit some broadband, be more conducive to spectrum allocation may flexibly; In the scene of heterogeneous network, can effectively reduce the phase mutual interference under the node of different stage and the coverage of same levels.
In LTE system and Versions LTE-A system, synchronizing signal is for cell identification, then obtain physical-layer cell identifier code (Identity by detecting primary/secondary synchronizing signal (PSS/SSS), and obtain initial time and Frequency Synchronization, and obtain Cyclic Prefix (CP) length information ID).Cell specific reference signal (Cell-specific Reference Signal, CRS) is for the time after initial synchronisation and frequency-tracking and RRM measurement.Master Information Block (Master Information Block, MIB) in, comprise some important information, comprise system bandwidth, System Frame Number and physical hybrid automatic repeat request indicator channel (Physical Hybrid ARQ Indicator Channel, PHICH) configuration, MIB is carried on the upper transmission of Physical Broadcast Channel (Physical Broadcast Channel, PBCH).Traditional backward compatibility carrier wave needs synchronous signal transmission and cell specific reference signal, and wherein the transmission of PSS/SSS is taking 5ms as the cycle, and cell specific reference signal is taking 1ms as the cycle.Newtype carrier wave can be divided into synchronous newtype carrier wave and asynchronous newtype carrier wave, synchronous newtype carrier wave refer to a kind of newtype carrier wave in time and frequency all with a LTE in backward compatibility carrier synchronization, and this backward compatible carrier wave is the carrier wave (being that described backward compatibility carrier wave is principal component carrier wave or the auxiliary component carrier of user side (User Equipment, UE)) of serving for user side.User side does not need extra synchronizing process.Conventionally this synchronous newtype carrier wave is to be applied to continuous carrier aggregation scene in frequency range, and as shown in Figure 1, newtype carrier wave and the backward compatibility carrier wave of synchronizeing with it are to use same transmitting antenna to scene.For asynchronous newtype carrier wave, need to transmit the cell specific reference signal of primary/secondary synchronizing signal and minimizing, the cell specific reference signal of this minimizing is mainly in time transmission cycle to be increased to 5ms, bandwidth is reduced to 50RB or 25RB.
Because synchronous newtype carrier wave does not need extra synchronizing process at receiving terminal, so do not need transmission for synchronous signal in synchronous newtype carrier wave, as PSS/SSS and CRS, so just can save some overheads, increase the utilization ratio of frequency spectrum, promote energy utilization efficiency, and can reduce the interference between the CRS of different districts in heterogeneous network scene.Meanwhile, do not transmit PSS/SSS and CRS and can be with the problem of serving yet, as user side cannot be found synchronous newtype carrier wave by Cell searching, and cannot obtain physical-layer cell ID and CP length.That is to say, the RRC process of LTE-A system can not meet the configuration of synchronous newtype carrier wave in carrier aggregation and access normally requirement.
Summary of the invention
The object of the present invention is to provide collocation method and the system of synchronous newtype carrier wave in a kind of LTE-A system, better solution never send primary/secondary synchronizing signal, Physical Broadcast Channel and do not send cell specific reference signal or the situation of transmitting portion bandwidth cell specific reference signals under, the problem of synchronous newtype carrier wave of using can normally be found and connect to user side.
According to an aspect of the present invention, provide the collocation method of synchronous newtype carrier wave in a kind of LTE-A system, having comprised:
Subscriber equipment receive from base station for identifying the carrier wave identification message of synchronous newtype carrier wave, and utilize described carrier wave identification message, carry out Check processing and the initial synchronization of synchronous newtype carrier wave;
If subscriber equipment detects synchronous newtype carrier wave, and with the described newtype carrier wave initial synchronisation of synchronizeing, send synchronous newtype carrier wave identification success message to base station, to described synchronous newtype carrier wave is configured to the auxiliary component carrier of subscriber equipment;
Otherwise, send synchronous newtype carrier wave recognition failures message to base station so that base station resends carrier wave identification message, until subscriber equipment detect synchronous newtype carrier wave and with the described newtype carrier wave initial synchronisation of synchronizeing.
Preferably, the step of described Check processing comprises:
Subscriber equipment is resolved the described carrier wave identification message of receiving;
When parsing obtains the information of synchronous newtype carrier wave and during with the information of described backward compatibility carrier wave of synchronizeing newtype carrier synchronization, utilizes the information of described synchronous newtype carrier wave, detect described synchronous newtype carrier wave;
Wherein, on described synchronous newtype carrier wave, do not transmit primary/secondary synchronizing signal, Physical Broadcast Channel, cell specific reference signal, or the cell specific reference signal of transmitting portions bandwidth.
Preferably, the step of described initial synchronization comprises:
Subscriber equipment utilizes the information of described backward compatibility carrier wave, obtain initial time and frequency synchronization information on described backward compatibility carrier wave, and described initial time and frequency synchronization information are applied on the described synchronous newtype carrier wave detecting so that with its initial synchronisation.
Preferably, the described step that described synchronous newtype carrier wave is configured to the auxiliary component carrier of subscriber equipment comprises:
Subscriber equipment receive from base station for configuring the carrier wave configuration messages of described synchronous newtype carrier wave, and utilize described carrier wave configuration messages, described synchronous newtype carrier wave is configured to auxiliary component carrier.
Preferably, after the step of the described auxiliary component carrier that described synchronous newtype carrier wave is configured to, also comprise:
Subscriber equipment is acquisition time and frequency offset information from backward compatibility carrier wave, and utilizes described time and frequency shift information, described synchronous newtype carrier wave is carried out to the migration of time and frequency.
Preferably, also comprise:
The transmission rate of subscriber equipment, by activating as the described synchronous newtype carrier wave of auxiliary component carrier, is improved in base station, and by deexcitation the described synchronous new carrier type as auxiliary component carrier, recover the transmission rate of subscriber equipment.
Preferably, subscriber equipment receives before described carrier wave identification message, also comprises:
Base station is divided into one group by described synchronous newtype carrier wave with described backward compatibility carrier wave of synchronizeing newtype carrier synchronization, and identifies respectively, for distinguishing other carrier wave.
According to a further aspect in the invention, provide the configuration-system of synchronous newtype carrier wave in a kind of LTE-A system, having comprised:
Initial synchronization module, for receive from base station for identifying the carrier wave identification message of synchronous newtype carrier wave, and utilize described carrier wave identification message, carry out Check processing and the initial synchronization of synchronous newtype carrier wave;
Detect identification module, synchronous newtype carrier wave detected for working as, and synchronize when newtype carrier wave initial synchronisation with described, send synchronous newtype carrier wave identification success message to base station, to described synchronous newtype carrier wave is configured to the auxiliary component carrier of subscriber equipment, otherwise, send synchronous newtype carrier wave recognition failures message to base station,, so that base station resends carrier wave identification message, until subscriber equipment detect synchronous newtype carrier wave and with the described newtype carrier wave initial synchronisation of synchronizeing.
Preferably, described initial synchronization module comprises:
Check processing submodule, for the described carrier wave identification message of receiving is resolved, and obtain the information of synchronous newtype carrier wave and during with the information of described backward compatibility carrier wave of synchronizeing newtype carrier synchronization when resolving, utilize the information of described synchronous newtype carrier wave, detect described synchronous newtype carrier wave, wherein, on described synchronous newtype carrier wave, do not transmit primary/secondary synchronizing signal, Physical Broadcast Channel, cell specific reference signal, or the cell specific reference signal of transmitting portions bandwidth;
Initial synchronization submodule, for utilizing the information of described backward compatibility carrier wave, obtain initial time and frequency synchronization information on described backward compatibility carrier wave, and described initial time and frequency synchronization information are applied on the described synchronous newtype carrier wave detecting so that with its initial synchronisation.
Preferably, also comprise:
Terminal configuration module, for receive from base station for configuring the carrier wave configuration messages of described synchronous newtype carrier wave, and utilize described carrier wave configuration messages, described synchronous newtype carrier wave is configured to auxiliary component carrier;
Compensating module, for acquisition time and frequency offset information from backward compatibility carrier wave, and utilizes described time and frequency shift information, described synchronous newtype carrier wave is carried out to the migration of time and frequency.
MAC layer control unit, for by activating as the described synchronous newtype carrier wave of auxiliary component carrier, improves the transmission rate of subscriber equipment, and by deexcitation the described synchronous new carrier type as auxiliary component carrier, recover the transmission rate of subscriber equipment;
Base station dispensing unit, for receiving before described carrier wave identification message, is divided into one group by described synchronous newtype carrier wave and the backward compatibility carrier wave of synchronizeing with it, and identifies respectively, for distinguishing other carrier wave.
Compared with prior art, beneficial effect of the present invention is:
The present invention is not sending primary/secondary synchronizing signal, Physical Broadcast Channel, cell specific reference signal, or when the cell specific reference signal of transmitting portion bandwidth, realize the synchronous newtype carrier wave of normal access, reduce system resource overhead, improve the availability of frequency spectrum, and reduced the interference between the cell specific reference signal of different districts in heterogeneous network scene.
Brief description of the drawings
Fig. 1 is the interior continuous carrier aggregation scene schematic diagram of frequency range that prior art provides;
Fig. 2 is the collocation method flow chart of the synchronous newtype carrier wave that provides of the embodiment of the present invention;
Fig. 3 is that in the carrier aggregation that provides of the embodiment of the present invention, component carrier covers schematic diagram;
Fig. 4 is the first pass figure of the configuration successful of the synchronous newtype carrier wave that provides of the embodiment of the present invention;
Fig. 5 is according to the second flow chart of the configuration successful of the synchronous new carrier type of the embodiment of the present invention;
Fig. 6 is according to the 3rd flow chart of the configuration failure of the synchronous new carrier type of the embodiment of the present invention.
Embodiment
To a preferred embodiment of the present invention will be described in detail, should be appreciated that following illustrated preferred embodiment, only for description and interpretation the present invention, is not intended to limit the present invention below in conjunction with accompanying drawing.
Subscriber equipment, by sending carrier wave identification message to subscriber equipment, is informed by frequency, physical-layer cell ID, the circulating prefix-length of the backward compatibility carrier wave of synchronous newtype carrier wave and synchronous newtype carrier wave in base station.Subscriber equipment obtains after the information of relative synchronous newtype carrier wave, detects in the list of Serving cell whether contain the backward compatibility carrier wave of informing in carrier wave identification message, if comprised, reports synchronous newtype carrier wave identification success message to base station; If do not comprised, report synchronous newtype carrier wave recognition failures message to base station.Like this, in the situation that there is no primary/secondary synchronizing signal and cell specific reference signal, can make subscriber equipment obtain the information such as time and frequency, physical-layer cell ID and circulating prefix-length of synchronous newtype carrier wave, make primary/secondary synchronizing signal, cell specific reference signal, the synchronization related information of LTA-A system can flexible configuration.
Fig. 2 is the collocation method flow chart of the synchronous newtype carrier wave that provides of the embodiment of the present invention, and as shown in Figure 2, step comprises:
Step S201: base station configuration synchronization newtype carrier wave.
The carrier wave of base station end is divided three classes: synchronous newtype carrier wave, the backward compatibility carrier wave of synchronizeing with it, and asynchronous newtype carrier wave and other backward compatibility carrier wave.Base station is divided into one group by synchronous newtype carrier wave with the backward compatibility carrier wave of its synchronised, and respectively these two kinds of carrier wave collection is carried out to extra mark, for distinguishing other carrier wave.The backward compatibility carrier wave of base station in order to distinguish synchronous newtype carrier wave and to synchronize with it is 0 and 1 by these two kinds of carrier identification.Wherein, additional identification is 0 to represent that this is one group of backward compatibility carrier type in carrier wave, and additional identification is 1 to represent that this is synchronous newtype carrier wave, and other carrier wave does not have this extra mark.
Further, the method configuration that primary carrier (Legacy carrier) is pressed in base station and described backward compatibility carrier wave of synchronizeing newtype carrier synchronization, and in physical channel structure, synchronous newtype carrier wave is carried out to different processing, on synchronous newtype carrier wave, do not transmit PSS/SSS, PBCH and do not transmit CRS or hop bandwidth CRS.Can transmission of data signals in the resource particle of not transmitting above-mentioned signal, also can transmit other reference signals etc.Owing to there is no synchronous signal transmission on synchronous newtype carrier wave, user side cannot be found this carrier wave by Cell searching, and user side can not be obtained and the initial synchronisation of this carrier wave.
Step S202: base station sends the information of relative synchronous newtype carrier wave to user side.
For the user side in RRC connection status, base station is by sending carrier wave identification message to user side, by the information notification user side of relative synchronous newtype carrier wave, the information of described relative synchronous newtype carrier wave comprises the information of synchronous newtype carrier wave and the information with described backward compatibility carrier wave of synchronizeing newtype carrier synchronization.
The information of described backward compatibility carrier wave can comprise the physical-layer cell ID of backward compatibility carrier wave.If described backward compatibility carrier wave is principal component carrier wave, can not comprise the physical-layer cell ID of this carrier wave, acquiescence backward compatibility carrier wave is principal component carrier wave; If backward compatibility carrier wave is non-principal component carrier wave (comprising auxiliary component carrier and other carrier waves that do not used by user), need the physical-layer cell ID that comprises this carrier wave.Also can adopt in another way, not distinguish principal component carrier wave and non-principal component carrier wave, all comprise the physical-layer cell ID of backward compatibility carrier wave.
The information of described synchronous newtype carrier wave comprises frequency, physical-layer cell ID, the circulating prefix-length of synchronous newtype carrier wave, and the source-information of initial time and frequency synchronization information (inform that user side can inform from carrier wave identification message with synchronize the backward compatibility carrier wave that newtype carrier wave is associated obtain initial time and frequency synchronization information).
Wherein, described physical-layer cell ID and circulating prefix-length are the necessary informations of the synchronous newtype carrier wave of demodulation down physical channel, and wherein physical-layer cell ID is the necessary information of descrambling, and circulating prefix-length is the necessary information of OFDM demodulation.User side is the down physical channel of the synchronous newtype carrier wave of normally demodulation next, as PDSCH, PDCCH etc.
Step S203: user side obtains the information of relative synchronous newtype carrier wave, and carrier wave is obtained initial synchronisation therewith, and report synchronous identify successfully/failed message of newtype carrier wave to base station.
User side receive and resolve from base station for identify synchronous newtype carrier wave carrier wave identification message, obtain the information of synchronous newtype carrier wave and the information of backward compatibility carrier wave; According to the information of described synchronous newtype carrier wave, described synchronous newtype carrier wave detected; According to the information of described backward compatibility carrier wave (being the backward compatibility carrier wave of informing in described carrier wave identification message), obtain initial time and frequency synchronization information on described backward compatibility carrier wave; Described initial time and frequency synchronization information are applied on synchronous newtype carrier wave, make the receiver and the described newtype carrier wave initial synchronisation of synchronizeing of user side, for example, the initial time of the backward compatibility carrier wave of synchronizeing with it is applied on synchronous newtype carrier wave, the initial frequency deviation of the backward compatibility carrier wave of synchronizeing with it is compensated to the frequency values to synchronous newtype carrier wave.Wherein, user side, according to the frequency of described synchronous newtype carrier wave, detects this carrier wave on corresponding frequency, without just can find this synchronous newtype carrier wave by cell search procedure.
Wherein, initial time synchronously refers to determines half frame boundaries and rough character boundary, directly the initial timing of the backward compatibility carrier wave of synchronised is applied on synchronous newtype carrier wave; Frequency Synchronization refers to and obtains the frequency values that obtains after compensate of frequency deviation, first obtains the initial frequency deviation of the backward compatibility carrier wave of synchronised, then this compensate of frequency deviation is given to the frequency values of synchronous newtype carrier wave.
Further, if user side gets information and initial time and the Frequency Synchronization success of relative synchronous newtype carrier wave, that is to say, user side detects synchronous newtype carrier wave, and with the described newtype carrier wave initial synchronisation of synchronizeing, user side is reported synchronous newtype carrier wave identification success message to base station.In the time that user side is reported synchronous newtype carrier wave identification success message, represent that user side has completed the identification of synchronous newtype carrier wave.At user side whenever necessary, base station can be configured to this synchronous newtype carrier wave by sending carrier wave configuration messages the auxiliary component carrier of user side according to the conventional method, in described carrier wave configuration messages, comprise the information in MIB, comprise the configuration of system bandwidth, System Frame Number, PHICH.
If user side obtains information failure or initial time and the Frequency Synchronization failure of relative synchronous newtype carrier wave, be that user side does not detect synchronous newtype carrier wave, or fail with detect synchronize newtype carrier wave initial synchronisation, user side report identification of base stations carrier wave failed message.In the time that user side is reported synchronous newtype carrier wave recognition failures message, base station need to send carrier wave identification message again, makes user side again obtain the information of relative synchronous newtype carrier wave.
User side can continue from synchronize acquisition time and frequency offset information the backward compatibility carrier wave of newtype carrier synchronization, utilize described time and frequency shift information, described synchronous newtype carrier wave is carried out to the migration of time and frequency.
In the time that user side needs higher transmission rate, base station can be passed through media access control (Medium Access Control, MAC) layer control unit (Control Element, CE) and activate synchronous newtype carrier wave.In the time that user side does not need high transfer rate, the synchronous newtype carrier wave of MAC layer control unit CE deexcitation, the synchronous newtype carrier wave of same deexcitation in the time of timer expired can be passed through in base station.
Further, above-mentioned carrier wave identification message and carrier wave configuration messages are carried by RRC signaling in base station, and send user side.
Below by three specific embodiments, implementation procedure of the present invention is described in detail.
Specific embodiment one
Fig. 3 is that in the carrier aggregation that provides of the embodiment of the present invention, component carrier covers schematic diagram, and as shown in Figure 3, user side is the LTE-A UE with carrier aggregation capacity, and has the ability of supporting newtype carrier wave.LTE-A UE is at component carrier 1(CC1, and frequency is f1) on set up RRC connect, CC1 is principal component carrier wave.In order to improve transmission rate, base station need to increase by two auxiliary component carriers for this UE, is respectively component carrier 2(CC2, and frequency is f2) and component carrier 3(CC3, frequency is f3).Wherein, CC1 and CC2 are backward compatibility carrier waves, and CC3 is synchronous newtype carrier wave.CC1 and CC3 be in same frequency range, and these two to carry wave frequency be continuous, CC3 is the newtype carrier wave of synchronizeing with CC1, CC2 and CC3 are discontinuous.
Fig. 4 is the first pass figure of the configuration successful of the synchronous newtype carrier wave that provides of the embodiment of the present invention, and as shown in Figure 4, step comprises:
Step S401: base station end configuration CC3.
The carrier wave of base station end is divided three classes: synchronous newtype carrier wave CC3, the backward compatibility carrier wave CC1 of synchronizeing with CC3, and asynchronous newtype carrier wave and other backward compatibility carrier waves CC2.CC3 and CC1 need to be distinguished in base station, that is to say, synchronous newtype carrier wave CC3 and the backward compatibility carrier wave CC1 of synchronizeing with it are divided into one group by base station, and respectively these two kinds of carrier wave collection are carried out to extra mark, is designated 0 and 1.Wherein, be designated 0 and represent that this is CC1, be designated 1 and represent that this is CC3, and other carrier wave (as CC2) does not have this extra mark.
Base station end carries out different processing to CC3 in physical channel structure, on CC3, does not transmit PSS/SSS, PBCH and does not transmit CRS or hop bandwidth CRS.Can transmission of data signals in the resource particle of not transmitting above-mentioned signal, also can transmit other reference signals etc.Owing to there is no the transmission of synchronizing signal on CC3, therefore, LTE-A UE cannot find CC3 by Cell searching, and LTE-A UE can not obtain initial synchronisation with CC3.
Step S402: base station sends the information about CC3 to LTE-A UE.
For the LTE-A UE that is in RRC connection status, base station can send RRC signaling to LTE-A UE and inform the information of LTE-A UE about CC3, comprises the information of synchronous newtype carrier wave and the information of backward compatibility carrier wave.Wherein, the information of described synchronous newtype carrier wave comprises the source (informing that LTE-A UE can obtain initial time and frequency synchronization information from CC1) of frequency, physical-layer cell ID, circulating prefix-length, initial time and the frequency synchronization information of CC3.The information of described backward compatibility carrier wave can comprise the physical-layer cell ID of CC1, also can not comprise the physical-layer cell ID of CC1, and acquiescence backward compatibility carrier wave is principal component carrier wave CC1.
Step S403:LTE-A UE obtains the information about CC3, obtains initial synchronisation with CC3.
LTE-A UE obtains the information about CC3 from the RRC signaling of receiving, comprises the source of frequency, physical-layer cell ID, circulating prefix-length, initial time and frequency synchronization information of CC3 and the CC1 of synchronizeing with CC3.
LTE-A UE obtains after the frequency of CC3, can on corresponding frequency, CC3 be detected, that is to say, without just finding CC3 by cell search procedure.
LTE-A UE can obtain initial time and frequency synchronization information from the CC1 of RRC signaled, and described initial time and frequency synchronization information are applied to CC3 above, to obtain initial synchronisation with CC3.Wherein, initial time synchronously refers to determines half frame boundaries and rough character boundary, and the initial time that obtains CC1 is applied to CC3, and the initial timing of CC3 and CC1 are identical; Frequency Synchronization refers to and obtains the frequency values that obtains after compensate of frequency deviation, first obtains the initial frequency deviation △ f of CC1, the then frequency values to CC3 by this compensate of frequency deviation, thus obtain f3 '=f3-△ f.
Physical-layer cell ID and circulating prefix-length are the necessary informations for demodulation CC3 down physical channel, and wherein, physical-layer cell ID is the necessary information of descrambling, and circulating prefix-length is the necessary information of OFDM demodulation.LTE-A UE utilizes the normally down physical channel of demodulation CC3 of physical-layer cell ID and circulating prefix-length, as PDSCH, PDCCH etc.
Step S404:LTE-A UE sends CC3 identification success message to base station.
LTE-A UE obtains the information about CC3 in RRC signaling, and obtains after initial synchronisation with CC3, to base station report CC3 identification success message.
Step S405: base station configuration CC2 and CC3 are auxiliary component carrier.
Because CC1 is the principal component carrier wave for user service, so base station can be according to conventional method in the time that user side needs, by send RRC signaling on CC1, CC2 and CC3 are configured to the auxiliary component carrier of LTE-A UE.Especially, base station can first configure in CC2 or CC3 by RRC signaling, then to configure another be auxiliary component carrier, also can configure CC2 and CC3 is auxiliary component carrier by RRC signaling simultaneously.Wherein, described RRC signaling comprises some system informations, comprises mib information, CC2 and CC3 downlink system bandwidth, dedicated radio resources (Physical Downlink Shared Channel, down control channel, Physical Uplink Shared Channel, ascending control channel and other resources etc.) information.
Step S406:LTE-A UE successfully configures CC2 and CC3 is auxiliary component carrier.
LTE-A UE adds CC2 and CC3 is auxiliary component carrier.Acquisition time from CC1 and frequency offset information that LTE-A UE can continue, and at the enterprising line time of CC3 and frequency offset compensation.Be the timing that LTE-A UE follows the tracks of CC1, CC3 uses the timing identical with CC1, estimates in real time the frequency shift (FS) △ f of CC1, is compensated to the frequency f 3 of CC3, thereby obtains f3 '=f3-△ f.And for CC2, LTE-A UE need to detect synchronizing signal and the CRS on CC2, obtain and the synchronizeing of CC2.
In the time that LTE-A UE needs higher transmission rate, CC3 can be activated by MAC layer control unit CE in base station.Particularly, comprise 8 bit informations in control unit CE, each bit is corresponding one by one with list Zhong community, Serving cell, by being set to " 1 " corresponding to the bit of CC3 position, represents to activate this locational carrier wave.LTE-A UE need to open the physical downlink control channel PDCCH that monitors synchronous newtype carrier wave, transmitting SRS and report CQI/PMI/RI/PTI.
In the time that LTE-A UE does not need high transfer rate, MAC layer control unit CE deexcitation CC3 can be passed through in base station, by being set to " 0 " corresponding to the bit of CC3 position, represents this locational carrier wave of deexcitation.Same deexcitation CC3 in the time of timer expired.LTE-A UE need to close the PDCCH that monitors synchronous new carrier type, not transmitting SRS and do not report CQI/PMI/RI/PTI.
The activation of auxiliary component carrier CC2 is identical with deactivation process and CC3, by being set to " 1 " corresponding to the bit of CC2 position or " 0 " is controlled.
Specific embodiment two
Fig. 3 is that in the carrier aggregation that provides of the embodiment of the present invention, component carrier covers schematic diagram, and as shown in Figure 3, user side is the LTE-A UE with carrier aggregation capacity, and has the ability of supporting newtype carrier wave.UE is at component carrier 1(CC1, and frequency is f1) on set up RRC connect, in order to improve transmission rate, base station need to increase by two auxiliary component carriers for LTE-A UE, be respectively component carrier 2(CC2, frequency is f2) and component carrier 3(CC3, frequency is f3).Wherein, CC1 and CC2 are backward compatibility carrier waves, and CC3 is synchronous newtype carrier wave.CC2 and CC3 be in same frequency range, and these two to carry wave frequency be continuous, CC3 is the newtype carrier wave of synchronizeing with CC2.CC1 and CC3 are discontinuous.
Fig. 5 is that as shown in Figure 5, step comprises according to the second flow chart of the configuration successful of the synchronous new carrier type of the embodiment of the present invention:
Step S501: base station end configuration CC3.
The carrier wave of base station end is divided three classes: synchronous newtype carrier wave CC3, the backward compatibility carrier wave CC2 of synchronizeing with CC3, and asynchronous newtype carrier wave and other backward compatibility carrier waves CC1.CC3 and CC2 need to be distinguished in base station, that is to say, synchronous newtype carrier wave CC3 and the backward compatibility carrier wave CC2 of synchronizeing with it are divided into one group by base station, and respectively these two kinds of carrier wave collection are carried out to extra mark, is designated 0 and 1.Wherein, be designated 0 and represent that this is CC2, be designated 1 and represent that this is CC3, and other carrier wave (as CC1) does not have this extra mark.
Base station end carries out different processing to CC3 in physical channel structure, on CC3, does not transmit PSS/SSS, PBCH and does not transmit CRS or hop bandwidth CRS.Can transmission of data signals in the resource particle of not transmitting above-mentioned signal, also can transmit other reference signals etc.Due to not synchronous signal transmission of CC3, therefore, LTE-A UE cannot find CC3 by Cell searching, and LTE-A UE can not obtain initial synchronisation with CC3.
Step S502: base station configuration CC2 is auxiliary component carrier.
Base station can be according to conventional method, utilizes CC1 to send RRC signaling, to CC2 is configured to the auxiliary component carrier of LTE-A UE.Wherein, described RRC signaling comprises some system informations, comprises CC2 downlink system bandwidth, dedicated radio resources information (Physical Downlink Shared Channel, down control channel, Physical Uplink Shared Channel, ascending control channel and other resources etc.).
Step S503: base station sends the information about CC3 to user side
For the LTE-A UE that is in RRC connection status, base station can send RRC signaling to LTE-A UE and inform the information of LTE-A UE about CC3, comprises the information of synchronous newtype carrier wave and the information of backward compatibility carrier wave.Wherein, the information of described synchronous newtype carrier wave comprises the source (informing that LTE-A UE can obtain initial time and frequency synchronization information from CC2) of frequency, physical-layer cell ID, circulating prefix-length, initial time and the frequency synchronization information of CC3.The information of described backward compatibility carrier wave can comprise the physical-layer cell ID of CC2, also can not comprise the physical-layer cell ID of CC2, acquiescence backward compatibility carrier wave is CC1, but this scene CC2 is the backward compatibility carrier wave of synchronizeing with CC3, so need to inform the physical-layer cell ID of CC2 in RRC signaling.
Step S504: user side obtains the information about CC3, obtains initial synchronisation with CC3.
LTE-A UE obtains the information about CC3 from the RRC signaling of receiving, comprise frequency, physical-layer cell ID, the circulating prefix-length of CC3, the source (informing that LTE-A UE can obtain initial time and frequency synchronization information from CC2) of initial time and frequency synchronization information and the physical-layer cell ID of CC2.
LTE-A UE obtains after the frequency of CC3, can on corresponding frequency, CC3 be detected, that is to say, without just finding CC3 by cell search procedure.
LTE-A UE, by the physical-layer cell ID of the CC2 that obtains, obtains initial time and frequency synchronization information from CC2, and it is upper that described initial time and frequency synchronization information are applied to CC3, to obtain initial synchronisation with CC3.
Wherein, initial time synchronously refers to determines half frame boundaries and rough character boundary, and it is upper that the initial time of the CC2 that is about to obtain is applied to CC3, makes the initial timing of CC3 identical with CC2.Frequency Synchronization refers to the frequency values obtaining after compensate of frequency deviation, first obtains the initial frequency deviation △ f of CC2, the then frequency values to CC3 by this compensate of frequency deviation, thus obtain f3 '=f3-△ f.
Physical-layer cell ID and circulating prefix-length are the necessary informations for demodulation CC3 down physical channel, and wherein, physical-layer cell ID is the necessary information of descrambling, and circulating prefix-length is the necessary information of OFDM demodulation.LTE-A UE utilizes the normally down physical channel of demodulation CC3 of physical-layer cell ID and circulating prefix-length, as PDSCH, PDCCH etc.
Step S505:LTE-A UE sends CC3 identification success message to base station.
LTE-A UE obtains the information about CC3 in RRC signaling, and obtains after initial synchronisation with CC3, to base station report CC3 identification success message.
Step S506: CC3 is configured to auxiliary component carrier by base station.
Particularly, be to be the auxiliary component carrier of user's service due to CC2, base station can, according to conventional method, by send RRC signaling on CC1, be configured to CC3 the auxiliary component carrier of LTE-A UE.Wherein, described RRC signaling comprises some system informations, comprises mib information, CC3 downlink system bandwidth, dedicated radio resources information (Physical Downlink Shared Channel, down control channel, Physical Uplink Shared Channel, ascending control channel and other resources etc.).
Step S507:LTE-A UE successfully configures CC2 and CC3 is auxiliary component carrier.
LTE-A UE adds CC2 and CC3 is auxiliary component carrier.Acquisition time from CC2 and frequency offset information that LTE-A UE can continue, and at the enterprising line time of CC3 and frequency offset compensation.And for CC1, LTE-A UE need to detect synchronizing signal and the CRS on CC1, obtain and the synchronizeing of CC1.
In the time that LTE-A UE needs higher transmission rate, CC3 can be activated by MAC layer control unit CE in base station.Particularly, comprise 8 bit informations in control unit CE, each bit is corresponding one by one with list Zhong community, Serving cell, by being set to " 1 " corresponding to the bit of CC3 position, represents to activate this locational carrier wave.LTE-A UE need to open the PDCCH that monitors synchronous newtype carrier wave, transmitting SRS and report CQI/PMI/RI/PTI.
In the time that LTE-A UE does not need high transfer rate, MAC layer control unit CE deexcitation CC3 can be passed through in base station, by being set to " 0 " corresponding to the bit of CC3 position, represents this locational carrier wave of deexcitation.Same deexcitation CC3 in the time of timer expired.LTE-A UE need to close the PDCCH that monitors synchronous new carrier type, not transmitting SRS and do not report CQI/PMI/RI/PTI.
The activation of auxiliary component carrier CC2 is identical with deactivation process and CC3, by being set to " 1 " corresponding to the bit of CC2 position or " 0 " is controlled.
Specific embodiment three
Fig. 3 is that in the carrier aggregation that provides of the embodiment of the present invention, component carrier covers schematic diagram, and as shown in Figure 3, subscriber equipment is the LTE-A UE with carrier aggregation capacity, and has the ability of supporting newtype carrier wave.UE is at component carrier 1(CC1, and frequency is f1) on set up RRC and connect, in order to improve transmission rate, base station need to, for two auxiliary component carriers of this UE increase, be respectively component carrier 2(CC2, frequency is f2) and component carrier 3(CC3, frequency is f3).Wherein, CC1 and CC2 are backward compatibility carrier waves, and CC3 is synchronous newtype carrier wave.CC1 and CC3 be in same frequency range, and these two to carry wave frequency be continuous, CC3 is the newtype carrier wave of synchronizeing with CC1.CC2 and CC3 are discontinuous.
Fig. 6 is that as shown in Figure 6, step comprises according to the 3rd flow chart of the configuration failure of the synchronous new carrier type of the embodiment of the present invention:
Step S601: base station end configuration CC3.
Concrete configuration is identical with the step S401 in specific embodiment one.
Step S602: base station sends the information about CC3 to LTE-A UE.
Concrete steps are identical with the step S402 of specific embodiment one.
Step S603:LTE-A UE obtains the information about CC3, obtains initial synchronisation with CC3.
Concrete steps are shown in the step S403 of specific embodiment one, and in this step, LTE-A UE obtains about the information failure of CC3 or failed with CC3 initial synchronisation.
Step S604:LTE-A UE sends CC3 recognition failures message to base station.
LTE-A UE obtain in RRC signaling about the information failure of CC3 or with the failure of CC3 initial synchronisation after, to base station report CC3 recognition failures message.
The present invention also provides the system of the new carrier type of configuration synchronization in a kind of LTE-A system, comprises the subscriber equipment of base station and user side, wherein:
Described base station is for storing one group of newtype carrier wave and the list of the backward compatibility carrier wave of synchronizeing with it, issue the configuration information of synchronous newtype carrier wave to user side by RRC signaling, and configure the auxiliary component carrier that this synchronous newtype carrier wave is user side, and activate with deexcitation and to synchronize newtype carrier wave as auxiliary component carrier by MAC layer control unit CE.Wherein, the configuration information that issues synchronous newtype carrier wave to user side by RRC signaling refers to, base station sends the configuration information of synchronous newtype carrier wave to a user or multiple user by RRC signaling, comprise frequency, community ID, the circulating prefix-length of synchronous newtype carrier wave and the backward compatibility carrier wave sequence number of synchronizeing with it.Detailed process, as described in the step S401 of embodiment 1, S402, S405, here repeats no more.Described base station comprises with lower module:
Base station dispensing unit is for receiving before described carrier wave identification message, described synchronous newtype carrier wave and the backward compatibility carrier wave of synchronizeing with it is divided into one group, and identifies respectively, for distinguishing other carrier wave;
MAC layer control unit, for by activating as the described synchronous newtype carrier wave of auxiliary component carrier, improves the transmission rate of subscriber equipment, and by deexcitation the described synchronous new carrier type as auxiliary component carrier, recover the transmission rate of subscriber equipment.
Described subscriber equipment is used for receiving RRC signaling, configuration synchronization newtype carrier wave, obtain frequency, physical-layer cell ID, the circulating prefix-length information of synchronous newtype carrier wave, and obtain the time and frequency shift information of synchronous newtype carrier wave from the backward compatibility carrier wave of synchronizeing with it, and carry out time and frequency-offset compensation, send synchronous identify successfully/failed message of newtype carrier wave to base station.Detailed process, as described in the step S403 of embodiment 1, S404, S406, here repeats no more.Described subscriber equipment comprises with lower module:
Initial synchronization module, for receive from base station for identifying the carrier wave identification message of synchronous newtype carrier wave, and utilize described carrier wave identification message, carry out Check processing and the initial synchronization of synchronous newtype carrier wave;
Detect identification module, synchronous newtype carrier wave detected for working as, and synchronize when newtype carrier wave initial synchronisation with described, send synchronous newtype carrier wave identification success message to base station, to described synchronous newtype carrier wave is configured to the auxiliary component carrier of subscriber equipment, otherwise, synchronous newtype carrier wave recognition failures message sent to base station, so that base station resends carrier wave identification message, until subscriber equipment detect synchronous newtype carrier wave and with the described newtype carrier wave initial synchronisation of synchronizeing;
Terminal configuration module, for receive from base station for configuring the carrier wave configuration messages of described synchronous newtype carrier wave, and utilize described carrier wave configuration messages, described synchronous newtype carrier wave is configured to auxiliary component carrier;
Compensating module, for acquisition time and frequency offset information from backward compatibility carrier wave, and utilizes described time and frequency shift information, described synchronous newtype carrier wave is carried out to the migration of time and frequency.
Wherein, described initial synchronization module comprises:
Check processing submodule is for resolving the described carrier wave identification message of receiving, and obtain the information of synchronous newtype carrier wave and during with the information of described backward compatibility carrier wave of synchronizeing newtype carrier synchronization when resolving, utilize the information of described synchronous newtype carrier wave, detect described synchronous newtype carrier wave, wherein, on described synchronous newtype carrier wave, do not transmit primary/secondary synchronizing signal, Physical Broadcast Channel, cell specific reference signal, or the cell specific reference signal of transmitting portions bandwidth;
Initial synchronization submodule is for utilizing the information of described backward compatibility carrier wave, obtain initial time and frequency synchronization information on described backward compatibility carrier wave, and described initial time and frequency synchronization information are applied on the described synchronous newtype carrier wave detecting so that with its initial synchronisation.
Further, above-mentioned carrier wave identification message and carrier wave configuration messages are carried by RRC signaling in base station, and send user side.
Obviously, those skilled in the art should be understood that, each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, also can be distributed on the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby they are stored in storage device and are carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
In sum, the present invention can ensure user side normally find and connect use synchronous newtype carrier wave.
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various amendments according to principle of the present invention.Therefore, all amendments of doing according to the principle of the invention, all should be understood to fall into protection scope of the present invention.
Claims (10)
1. a collocation method for synchronous newtype carrier wave in LTE-A system, is characterized in that, comprising:
Subscriber equipment receive from base station for identifying the carrier wave identification message of synchronous newtype carrier wave, and utilize described carrier wave identification message, carry out Check processing and the initial synchronization of synchronous newtype carrier wave;
If subscriber equipment detects synchronous newtype carrier wave, and with the described newtype carrier wave initial synchronisation of synchronizeing, send synchronous newtype carrier wave identification success message to base station, to described synchronous newtype carrier wave is configured to the auxiliary component carrier of subscriber equipment;
Otherwise, send synchronous newtype carrier wave recognition failures message to base station so that base station resends carrier wave identification message, until subscriber equipment detect synchronous newtype carrier wave and with the described newtype carrier wave initial synchronisation of synchronizeing.
2. method according to claim 1, is characterized in that, the step of described Check processing comprises:
Subscriber equipment is resolved the described carrier wave identification message of receiving;
When parsing obtains the information of synchronous newtype carrier wave and during with the information of described backward compatibility carrier wave of synchronizeing newtype carrier synchronization, utilizes the information of described synchronous newtype carrier wave, detect described synchronous newtype carrier wave;
Wherein, on described synchronous newtype carrier wave, do not transmit primary/secondary synchronizing signal, Physical Broadcast Channel, cell specific reference signal, or the cell specific reference signal of transmitting portions bandwidth.
3. method according to claim 2, is characterized in that, the step of described initial synchronization comprises:
Subscriber equipment utilizes the information of described backward compatibility carrier wave, obtain initial time and frequency synchronization information on described backward compatibility carrier wave, and described initial time and frequency synchronization information are applied on the described synchronous newtype carrier wave detecting so that with its initial synchronisation.
4. method according to claim 3, is characterized in that, the described step that described synchronous newtype carrier wave is configured to the auxiliary component carrier of subscriber equipment comprises:
Subscriber equipment receive from base station for configuring the carrier wave configuration messages of described synchronous newtype carrier wave, and utilize described carrier wave configuration messages, described synchronous newtype carrier wave is configured to auxiliary component carrier.
5. method according to claim 4, is characterized in that, after the step of the described auxiliary component carrier that described synchronous newtype carrier wave is configured to, also comprises:
Subscriber equipment is acquisition time and frequency offset information from backward compatibility carrier wave, and utilizes described time and frequency shift information, described synchronous newtype carrier wave is carried out to the migration of time and frequency.
6. according to the method described in claim 1-5 any one, it is characterized in that, also comprise:
The transmission rate of subscriber equipment, by activating as the described synchronous newtype carrier wave of auxiliary component carrier, is improved in base station, and by deexcitation the described synchronous new carrier type as auxiliary component carrier, recover the transmission rate of subscriber equipment.
7. method according to claim 6, is characterized in that, subscriber equipment receives before described carrier wave identification message, also comprises:
Base station is divided into one group by described synchronous newtype carrier wave with described backward compatibility carrier wave of synchronizeing newtype carrier synchronization, and identifies respectively, for distinguishing other carrier wave.
8. a configuration-system for synchronous newtype carrier wave in LTE-A system, is characterized in that, comprising:
Initial synchronization module, for receive from base station for identifying the carrier wave identification message of synchronous newtype carrier wave, and utilize described carrier wave identification message, carry out Check processing and the initial synchronization of synchronous newtype carrier wave;
Detect identification module, synchronous newtype carrier wave detected for working as, and synchronize when newtype carrier wave initial synchronisation with described, send synchronous newtype carrier wave identification success message to base station, to described synchronous newtype carrier wave is configured to the auxiliary component carrier of subscriber equipment, otherwise, synchronous newtype carrier wave recognition failures message sent to base station, so that base station resends carrier wave identification message, until subscriber equipment detect synchronous newtype carrier wave and with the described newtype carrier wave initial synchronisation of synchronizeing.
9. system according to claim 8, is characterized in that, described initial synchronization module comprises:
Check processing submodule, for the described carrier wave identification message of receiving is resolved, and obtain the information of synchronous newtype carrier wave and during with the information of described backward compatibility carrier wave of synchronizeing newtype carrier synchronization when resolving, utilize the information of described synchronous newtype carrier wave, detect described synchronous newtype carrier wave, wherein, on described synchronous newtype carrier wave, do not transmit primary/secondary synchronizing signal, Physical Broadcast Channel, cell specific reference signal, or the cell specific reference signal of transmitting portions bandwidth;
Initial synchronization submodule, for utilizing the information of described backward compatibility carrier wave, obtain initial time and frequency synchronization information on described backward compatibility carrier wave, and described initial time and frequency synchronization information are applied on the described synchronous newtype carrier wave detecting so that with its initial synchronisation.
10. system according to claim 8 or claim 9, is characterized in that, also comprises:
Terminal configuration module, for receive from base station for configuring the carrier wave configuration messages of described synchronous newtype carrier wave, and utilize described carrier wave configuration messages, described synchronous newtype carrier wave is configured to auxiliary component carrier;
Compensating module, for acquisition time and frequency offset information from backward compatibility carrier wave, and utilizes described time and frequency shift information, described synchronous newtype carrier wave is carried out to the migration of time and frequency.
MAC layer control unit, for by activating as the described synchronous newtype carrier wave of auxiliary component carrier, improves the transmission rate of subscriber equipment, and by deexcitation the described synchronous new carrier type as auxiliary component carrier, recover the transmission rate of subscriber equipment;
Base station dispensing unit, for receiving before described carrier wave identification message, is divided into one group by described synchronous newtype carrier wave and the backward compatibility carrier wave of synchronizeing with it, and identifies respectively, for distinguishing other carrier wave.
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| PCT/CN2013/083342 WO2014169559A1 (en) | 2013-04-19 | 2013-09-11 | Synchronous new carrier configuration method and system |
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| CN104113906B (en) | 2019-01-04 |
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