CN102006655A - RRC (Radio Resource Control) connection reestablishment method and device in carrier aggregation - Google Patents
RRC (Radio Resource Control) connection reestablishment method and device in carrier aggregation Download PDFInfo
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Abstract
The invention provides RRC (Radio Resource Control) connection reestablishment method and device in carrier aggregation. The method comprises the step that user equipment (UE) performs RRC connection reestablishment according to a parameter on a component carrier, which is specified by a service base station, or by selecting a parameter on a corresponding component carrier according to a preset strategy. The invention initiates the RRC connection reestablishment according to the selected unique parameter to overcome the problem of the prior art that the RRC connection reestablishment in a carrier aggregation cell cannot be established effectively because T311, PCI (Peripheral Command Indicator), C-PNT1, and other parameters have ambiguity when LTE (Line Terminator Equipment)-A UE which simultaneously works on a plurality of component carriers initiates the RRC connection reestablishment.
Description
Technical field
The present invention relates to the communications field, the method and apparatus of Radio Resource control in a kind of carrier aggregation (Radio Resource Control is called for short RRC) connection reconstruction.
Background technology
For higher data rate is provided to the mobile subscriber, advanced long-term evolution system (Long Term Evolution Advance, abbreviate LTE-A as) carrier aggregation technology (Carrier aggregation proposed, abbreviate CA as), its objective is subscriber equipment (User Equipment for having respective capabilities, abbreviate UE as) bigger broadband is provided, improve the peak rate of UE.Long evolving system (Long Term Evolution, abbreviate LTE as) in, the maximum downstream transmission bandwidth of system's support is 20MHz, carrier aggregation is with two or more component carrier (component carriers, abbreviating CC as) polymerization get up to constitute a sub-district, thereby make this sub-district support that maximum is no more than the downstream transmission bandwidth of 100MHz greater than 20MHz, the sub-district of employing carrier aggregation technology is referred to as the sub-district of carrier aggregation sub-district or carrier aggregation.
Whether carrier aggregation is continuous on frequency domain by each component carrier, can divide continuous carrier aggregation and discrete carrier aggregation, and so-called continuous carrier aggregation is meant that each component carrier is interconnective on frequency domain; Discontinuous carrier aggregation then refers to it is unconnected between each component carrier on frequency domain.Carrier aggregation by each component carrier whether in identical frequency band, the carrier aggregation and the carrier aggregation of striding frequency band (over multiple frequency bands) that can be divided into single band (single band), so-called single carrier aggregation is meant all component carriers that participate in carrier aggregation all in same frequency band, and single carrier aggregation can be that continuous carrier aggregation also can be discontinuous carrier aggregation; The carrier aggregation that what is called is striden frequency band is meant that the component carrier that participates in carrier aggregation can be derived from different frequency bands.
In the LTE system; in order to make mobile communication system have stronger robustness; satisfy professional continuity; give the good business experience of user; the subscriber equipment that is under the RRC connection status (RRC_CONNECTED) detects Radio Link Failure; handoff failure; the failure of bottom integrity protection; when RRC connects reasons such as reshuffling (RRC connection reconfiguration) failure; subscriber equipment does not directly withdraw from the RRC connection status; but carry out RRC connection reconstruction (RRC connection Re-establishment) process; purpose is that recovering RRC by this process connects; guarantee professional continuity as far as possible, give the good business experience of user.UE need select a suitable E-UTRA (Evolved Universal Terrestrial Radio Access) sub-district when the RRC connection reconstruction, be called the reconstructed object sub-district, the reconstructed object sub-district can be former sub-district, be UE carry out before the RRC connection reconstruction resident sub-district, also can be other sub-districts that are different from former sub-district.
The prerequisite of RRC connection reconstruction success must be that Target cell is ready sub-district (Prepared cell), be that Target cell has the effective context of current UE (UE context), the UE context comprises the security capabilities (security capability) of current UE, the security information (AS security information) of Access Layer, RAB E-RAB (the E-UTRAN Radio Access Bearer) information that UE sets up, the information (RRC context) relevant with the RRC connection management etc.Target cell can be the UE distributing radio resource according to the UE context that is had directly.UE has at first hung the every other Signaling Radio Bearer (SRB except Signaling Radio Bearer 0 (SRB0) when the RRC connection reconstruction, comprise SRB1 and SRB2) and Data Radio Bearer (DRB), by the RRC connection reconstruction, UE can not need to return RRC_IDLE attitude (idle condition) and directly recover Signaling Radio Bearer 1 (SRB1), and then according to the Radio Resource of the UE context configuration/reconfiguration UE that Target cell had, realize professional continuity, give the good business experience of user.
As shown in Figure 1, the successful flow process of RRC reconstruction specifically may further comprise the steps in the long evolving system:
S101:UE detects Radio Link Failure, perhaps handoff failure, and perhaps failure of bottom integrity protection or RRC connect and reshuffle (RRC connection reconfiguration) failure;
S 102:UE initiates the RRC connection reconstruction, start timer T311, hung the every other Signaling Radio Bearer (SRB except SRB0, comprise SRB1 and SRB2) and wireless data carrying (DRB), carry out cell selecting then, wherein timer T311 is used for limiting the cell selection time of UE in RRC connection reconstruction process, the concrete value of this timer by UE before the RRC connection reconstruction obtain and preservation the System information block (SIB2) of resident former sub-district;
S103:UE had chosen a proper cell in the LTE system before T311 is overtime, UE stops timer T311, resident to this proper cell, wherein above-mentioned proper cell can be before the RRC connection reconstruction UE resident former sub-district, also can be other sub-districts in the LTE system, patent unification of the present invention be called Target cell;
The base station of S104:UE under Target cell sends RRC connection reconstruction request (RRC connection reestablishment request), in this signaling, comprise Radio Network Temporary Identifier (the Cell Radio Network Temporary Identifier of UE in former sub-district, be called for short C-RNTI), the Physical Cell Identifier of former sub-district (Physical Cell Identity, be called for short PCI) information, UE is in security configuration (Short MAC-I) information of former sub-district etc., wherein UE need be according to the PCI of former sub-district, C-RNTI, and other relevant parameters calculate the shortMAC-I of former sub-district;
S105: after the base station under the Target cell receives the RRC connection reconstruction request of UE, according to the PCI of the former sub-district of carrying in the request of RRC connection reconstruction and UE C-RNTI in former sub-district, the shortMAC-I inquiry is kept at the UEcontext of this UE of this base station in former sub-district, then according to the security information of UE Access Layer in the UE of former sub-district context, the SRB1 information that UE sets up etc. send RRC connection reconstruction (RRC connection reestablishment) signaling to this UE.Comprise in the RRC connection reconstruction signaling that the SRB1 information (being included in radio Resource Configuration Dedicated, in the wireless resource configuration) of UE is given in configuration and about the information (Next Hop Chaining Count) of security configuration etc.;
After S106:UE receives RRC connection reconstruction signaling, extract the parameter that Target cell disposed and carry out radio-resource-configuration, recover the configuration of SRB 1, activate the safety of Access Layer again;
After the configuration of S107:UE successful execution S 106, send the signaling that the RRC connection reconstruction is finished (RRC connection reestablishment complete) to Target cell.
As seen, in the LTE system, the RRC connection reconstruction need be applied to the T311 of former sub-district, PCI, parameters such as C-RNTI.
In the sub-district of carrier aggregation each component carrier by whether compatible LTE, can be divided into the component carrier of backward compatibility and the component carrier of non-backward compatible, the component carrier of backward compatibility allows the UE of LTE and LTE-A to insert, and the component carrier of non-backward compatible only allows the UE of LTE-A to use.The component carrier of backward compatibility and non-backward compatible all needs to broadcast the resident necessary system message of UE in the existing LTE system.The PCI of the sub-district of carrier aggregation on each component carrier can be identical, also can be different, and the C-RNTI on UE each component carrier in the sub-district of carrier aggregation can be the same or different.There are a plurality of upstream components carrier waves the sub-district of carrier aggregation, for LTE-A subscriber equipment that is in idle condition in the sub-district, in order to guarantee backwards compatibility, simplify the behavior of idle condition UE, reduce the power consumption of UE, idle condition UE only resides on some component carriers, and cell selecting and the gravity treatment flow process of idle condition and RRC connection status LTE-A UE also need to guarantee backwards compatibility, i.e. can only select the one-component carrier wave in the carrier aggregation sub-district resident during cell selecting or gravity treatment.But when LTE-A UE enters after the connection status, in order to allow LTA-A UE transmit with higher speed, a plurality of component carriers be distributed/be activated in the base station can for LTE-A UE, LTE-A UE can be dispatched at the enterprising line data of a plurality of component carriers simultaneously, also be that the LTE-A UE of connection status can be operated on a plurality of component carriers simultaneously.
When the inventor finds to be operated in simultaneously in the prior art LTE-AUE on a plurality of component carriers initiate the RRC connection reconstruction in the carrier aggregation sub-district, above-mentioned T311, PCI, the isoparametric ambiguity that exists of C-RNTI causes in the carrier aggregation sub-district RRC connection reconstruction effectively not set up.
Summary of the invention
The present invention aims to provide the method and apparatus of radio resource control connection reestablishment in a kind of carrier aggregation, in the time of can solving the LTE-AUE initiation RRC connection reconstruction that is operated in simultaneously in the prior art on a plurality of component carriers, above-mentioned T311, PCI, the isoparametric ambiguity that exists of C-RNTI, the problem that causes the RRC connection reconstruction effectively not set up.
In an embodiment of the present invention, the method of radio resource control connection reestablishment in a kind of carrier aggregation is provided, this method is a user equipment (UE) according to the parameter on the specified component carrier of serving BS, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the radio resource control RRC connection reconstruction.
Further, in said method, user equipment (UE) is according to the parameter on the specified component carrier of serving BS, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, carrying out the radio resource control RRC connection reconstruction specifically comprises: UE is according to the parameter on the specified component carrier of serving BS, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, target BS under proper cell sends the request of RRC connection reconstruction, wherein, UE is operated on two component carriers at least; Target BS is according to the UE context of the parameter query UE that carries in the request of RRC connection reconstruction, and sends RRC connection reconstruction signaling according to the UE context to UE; UE carries out self configuration after receiving RRC connection reconstruction signaling, and finishes signaling to target BS transmission RRC connection reconstruction.
Further, in said method, the connected network of UE all has the carrier aggregation ability.
Further, in said method, UE is according to the parameter on the specified component carrier of serving BS, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, target BS under proper cell sends the request of RRC connection reconstruction and specifically comprises: the T311 value of the component carrier of common parameter institute reference or serving BS are the special-purpose T311 value that UE distributes at least two component carriers of the UE work that serving BS is specified, perhaps select T311 value on the corresponding component carrier as the value of UE startup timer T311 according to predetermined policy described UE; UE hangs every other Signaling Radio Bearer and the Data Radio Bearer outside the Signaling Radio Bearer 0, carries out cell selecting; UE successfully chooses on the component carrier of proper cell before timer T311 is overtime, and stops timer T311.
Further, in said method, the specified component carrier of serving BS is the component carrier of appointment in the serving BS space interface signaling.
Further, in said method, space interface signaling is system message or special RRC signaling.
Further, in said method, UE selects the parameter on the corresponding component carrier specifically to comprise according to predetermined policy: when UE selected generation RRC connection reconstruction that UE and network make an appointment, UE selected the parameter on the specific component carrier.
Further, in said method, UE selects the parameter on the corresponding component carrier specifically to comprise according to predetermined policy: UE selects UE the last time successfully to set up the component carrier that RRC connects, the perhaps component carrier of the detected last generation Radio Link Failure of UE is perhaps given tacit consent to the parameter on the component carrier of ad-hoc location.
Further, in said method, above-mentioned parameter comprises following at least a: T311 value, Physical Cell Identifier and Radio Network Temporary Identifier.
In an embodiment of the present invention, the device of radio resource control connection reestablishment in a kind of carrier aggregation also is provided, this device is used for user equipment (UE) according to the parameter on the specified component carrier of serving BS, perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the radio resource control RRC connection reconstruction.
Further, said apparatus comprises: request module, be used for UE according to the parameter on the specified component carrier of serving BS, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, target BS under proper cell sends the request of RRC connection reconstruction, and wherein, UE is operated on two component carriers at least; Enquiry module is used for the UE context of the target BS parameter query UE that request is carried according to the RRC connection reconstruction, and sends RRC connection reconstruction signaling according to the UE context to UE; Confirm module, be used for carrying out self configuration after UE receives RRC connection reconstruction signaling, and finish signaling to target BS transmission RRC connection reconstruction.
In the above-described embodiments, when the UE on being operated at least two component carriers initiates the RRC connection reconstruction, select parameter on the corresponding component carrier according to predetermined policy, and then initiate the RRC connection reconstruction according to the parameter of selected uniqueness, when having overcome the LTE-A UE that is operated in simultaneously in the prior art on a plurality of component carriers and in the carrier aggregation sub-district, having initiated the RRC connection reconstruction, above-mentioned T311, PCI, the isoparametric ambiguity that exists of C-RNTI causes the problem that the RRC connection reconstruction can not effectively be set up in the carrier aggregation sub-district.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the flow chart of RRC connection reconstruction in the medium-term and long-term evolution system of correlation technique;
Fig. 2 shows the network structure schematic diagram of LTE system according to an embodiment of the invention;
Fig. 3 shows the method flow diagram of radio resource control connection reestablishment in the carrier aggregation according to an embodiment of the invention;
Fig. 4 shows the schematic diagram of UE from carrier cell RRC connection reconstruction to another carrier cell in accordance with a preferred embodiment of the present invention;
Fig. 5 shows the method flow diagram of UE from carrier cell RRC connection reconstruction to another carrier cell according to an embodiment of the invention;
Fig. 6 shows the method flow diagram of UE from carrier cell RRC connection reconstruction to another carrier cell according to a preferred embodiment of the present invention;
Fig. 7 shows the schematic diagram of UE from carrier cell RRC connection reconstruction to the LTE sub-district in accordance with a preferred embodiment of the present invention;
Fig. 8 show UE according to an embodiment of the invention according to the present invention from carrier cell RRC connection reconstruction to LTE sub-district method flow diagram;
Fig. 9 shows the device schematic diagram of radio resource control connection reestablishment in the carrier aggregation according to an embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 2 shows the network structure schematic diagram of LTE system according to an embodiment of the invention.As shown in Figure 2, the framework of LTE system comprises the base station (eNodeB of evolution, be called for short eNB, for convenience of description, all abbreviate the base station as in the embodiment of the invention) form the Radio Access Network (E-RAN, Evolved Radio Access Network) of evolution and the packet core network of evolution, wherein, the packet core network of evolution is made up of Mobility Management Entity (MME, Mobility Management Entity) and service gateway entity (S-GW, Serving Gateway).Interface between eNB and the core network is the S1 interface, and wherein, the interface between eNB and the MME is expressed as S1-MME, is used to finish the chain of command function of mobile management and S1 interface; Interface between eNB and the S-GW is expressed as S1-U, is used to finish the function such as route, transmission of user data.Link to each other by X2 interface between the eNB, X2 interface be used to finish subscriber equipment under state of activation the mobile management function and the information interaction between the eNB of equity.
RRC connection reconstruction scene in the embodiment of the invention is that UE is reconstructed into another 2/LTE sub-district, carrier aggregation sub-district from a carrier aggregation sub-district 1, as shown in Figure 2, and all suppose in the embodiment of the invention, before the RRC connection reconstruction, the base station 1 under 1 has got access to the context of this UE from the carrier aggregation sub-district by the X2/S1 interface in base station 2 under the 2/LTE sub-district, carrier aggregation sub-district, concrete obtain manner is this area public's technology, repeats no more in the embodiment of the invention; In addition except that specifying, the UE described in the embodiment of the invention is LTE-A UE, has the carrier aggregation ability.
In an embodiment of the present invention, the method of RRC connection reconstruction in a kind of carrier aggregation is provided, this method is UE according to the parameter on the specified component carrier of serving BS, and perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the radio resource control RRC connection reconstruction.
Fig. 3 shows the method flow diagram of radio resource control connection reestablishment in the carrier aggregation according to an embodiment of the invention, UE is according to the parameter on the specified component carrier of serving BS among this embodiment, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the radio resource control RRC connection reconstruction and specifically comprises:
S302, be operated in user equipment (UE) at least two component carriers according to the parameter on the specified component carrier of serving BS, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, the target BS under this suitable cell sends the request of RRC connection reconstruction;
S304, target BS be according to the UE context of the parameter query UE that carries in the request of RRC connection reconstruction, and send RRC connection reconstruction signaling according to the UE context to UE;
S306, UE carry out self configuration after receiving RRC connection reconstruction signaling, and finish signaling to target BS transmission RRC connection reconstruction.
In the present embodiment, when the UE on being operated at least two component carriers initiates the RRC connection reconstruction, according to the parameter on the specified component carrier of serving BS, perhaps select parameter on the corresponding component carrier according to predetermined policy, and then initiate the RRC connection reconstruction according to the parameter of selected uniqueness, when having overcome the LTE-A UE initiation RRC connection reconstruction that is operated in simultaneously in the prior art on a plurality of component carriers, above-mentioned T311, PCI, the isoparametric ambiguity that exists of C-RNTI, the problem that causes the RRC connection reconstruction effectively not set up.
Further, in said method, the connected network of UE all has the carrier aggregation ability.
Further, in said method, step 302 specifically comprises: the T311 value of the component carrier of the common parameter institute reference at least two component carriers of the UE work that serving BS is specified, or serving BS is the special-purpose T311 value that UE distributes, and perhaps selects T311 value on the corresponding component carrier as the value of UE startup timer T311 according to predetermined policy UE; UE hangs every other Signaling Radio Bearer and the Data Radio Bearer outside the Signaling Radio Bearer 0, carries out cell selecting; UE successfully chooses a proper cell before timer T311 is overtime, and stops timer T311.
Further, in said method, the specified component carrier of serving BS is the component carrier of serving BS appointment in space interface signaling.
Further, in said method, space interface signaling is system message or special RRC signaling.
Further, in said method, UE selects the parameter on the corresponding component carrier specifically to comprise according to predetermined policy: when UE selected generation RRC connection reconstruction that UE and network make an appointment, UE selected the parameter on the specific component carrier.
Further, in said method, UE selects the parameter on the corresponding component carrier specifically to comprise according to predetermined policy: UE selects UE the last time successfully to set up the component carrier that RRC connects, the perhaps component carrier of the detected last generation Radio Link Failure of UE is perhaps given tacit consent to the parameter on the component carrier of ad-hoc location.
Further, in said method, above-mentioned parameter comprises following at least a: T3 value, Physical Cell Identifier and Radio Network Temporary Identifier.
Fig. 4 shows the schematic diagram of UE from carrier cell RRC connection reconstruction to another carrier cell in accordance with a preferred embodiment of the present invention.As shown in Figure 4, suppose the carrier aggregation sub-district 1 and the carrier aggregation sub-district 2 that have two to belong to base station 1 and base station 2 respectively in the current system.There are two component carrier CC1 and CC2 in carrier aggregation sub-district 1, equal backward compatibility, promptly carrier aggregation sub-district 1 by on CC1 and the CC2 (CC1, PCI1) and (CC2 PCI2) forms.In order to guarantee backwards compatibility (CC1, PCI1) and (CC2, PCI2) all broadcast the resident necessary system message of LTE UE in the existing LTE system, in addition, (CC1, PCI1) and (CC2, PCI2) information of other CC in the broadcast carrier aggregation cell 1 all also, as PCI, frequency, information such as bandwidth (i.e. (CC1, PCI1) broadcasting (vice versa for CC2, information PCI2)), and to indicate the component carrier of this carrier aggregation sub-district common parameter institute reference be CC2, concrete broadcast mode can be to increase new system message, also can be the above-mentioned information that increases in original system message (as System information block SIB3), and above-mentioned information can only be received by LTE-A UE, promptly at LTE UE, (CC1 is PCI1) with (CC2 PCI2) is two independently sub-districts respectively, and, residently to any one-component carrier wave, can both know the information that constitutes other component carriers of same carrier aggregation sub-district with this component carrier for LTE-A UE.There are two component carrier CC3 and CC4 in carrier aggregation sub-district 2, equal backward compatibility, and promptly carrier aggregation sub-district 2 is by (the CC3 on CC3 and the CC4, PCI3) and (CC4 PCI4) forms (CC3, PCI3) and (CC4, PCI4) broadcast mechanism of system message is with carrier aggregation sub-district 1.
Fig. 5 shows the method flow diagram of UE from carrier cell RRC connection reconstruction to another carrier cell according to an embodiment of the invention.As shown in Figure 5, the ambiguity concrete grammar of RRC connection reconstruction parameter is as follows in the present embodiment solution carrier aggregation sub-district:
S501:UE arrives component carrier (CC1 in IDLE attitude cell selecting, PCI1), the system message that UE broadcasts by this component carrier gets access to the frequency of component carrier CC2, PCI and bandwidth information are CC2 in this component carrier of knowing this carrier aggregation sub-district common parameter institute reference simultaneously;
S502:UE initiates professional, at component carrier (CC1, PCI1) setting up RRC on connects, then according to the relevant information of the component carrier CC2 that S101 obtained, directly obtain at component carrier (CC2, PCI2) carry out the necessary system message of transfer of data (as Master Information Block MIB, System information block SIB1, System information block SIB2).Because current service traffics need, afterwards, base station 1 (serving BS) is at component carrier (CC1, PCI1) distributed component carrier (CC2 for UE again on the basis, PCI2), the concrete method of salary distribution can be to connect to reshuffle in (RRC connection reconfiguration) process at existing RRC to dispose, and also can be to dispose above-mentioned component carrier by newly-increased RRC signaling.Be that UE is operated on component carrier CC1 and the CC2 (be called the work carrier wave or activate carrier wave) simultaneously, base station 1 is respectively this UE and has distributed Radio Network Temporary Identifier C-RNTI1 and C-RNTI2 on CC1 and CC2;
S503:UE 1 carries out in the process of transfer of data in the carrier aggregation sub-district, measurement report and corresponding radio resource management algorithm that base station 1 reports according to UE, judgement need switch to carrier aggregation sub-district 2 to UE, UE according to the switching command of base station 1 to carrier aggregation sub-district 2 ((CC3, PCI3) and (CC4, PCI4)) switch, but handoff failure;
After S504:UE judges handoff failure, initiate RRC connection reconstruction flow process.UE knows that according to system message the component carrier of common parameter institute reference in the carrier aggregation sub-district 1 is CC2, so UE starts timer T311, the timer value is (CC2, the T311 value of PCI2) being broadcasted among the SIB2.UE hangs every other Signaling Radio Bearer (SRB comprises SRB 1 and SRB2) and the Data Radio Bearer (DRB) except SRB0, carries out cell selecting;
S505:UE before T311 is overtime, successfully choose carrier aggregation sub-district 2 component carrier (CC3, PCI3) on, UE stops timer T311;
S506:UE sends the request of RRC connection reconstruction to base station 2 (target BS), UE knows that according to carrier aggregation sub-district 1 system message the component carrier of common parameter institute reference in the carrier aggregation sub-district 1 is CC2, so the UE PCI and the C-RNTI that carry in this request are respectively PCI2 and C-RNTI2, and the shortMAC-I that calculates according to PCI2 and C-RNTI2 and other relevant parameters;
S507: after the RRC connection reconstruction request of UE is received in base station 2, at the UE of carrier aggregation sub-district 1 context, send the reconstruction signaling to this UE according to UE context according to the content search UE that carries in the request of RRC connection reconstruction;
After S508:UE receives RRC connection reconstruction signaling, extract configuration parameter and carry out radio-resource-configuration, recover the configuration of SRB 1, activate the safety of Access Layer again, send the signaling that the RRC connection reconstruction is finished to Target cell.
Need to prove, for LTE UE or only be operated in LTE-A UE on the one-component carrier wave, when the RRC connection reconstruction takes place when, the parameter that T311, PCI, C-RNTI just use broadcasting on this component carrier or distribute.
Need to prove that in addition if different component carriers adopts identical PCI in the carrier aggregation sub-district, same UE uses same C-RNTI in the carrier aggregation sub-district, only need determine that when the RRC connection reconstruction parameter of T311 is selected.
Fig. 6 shows the method flow diagram of UE from carrier cell RRC connection reconstruction to another carrier cell according to a preferred embodiment of the present invention.As shown in Figure 4, suppose the carrier aggregation sub-district 1 and the carrier aggregation sub-district 2 that have two to belong to base station 1 and base station 2 respectively in the current system.There are two component carrier CC1 and CC2 in the carrier aggregation sub-district, the frequency ratio CC1 height of CC2 wherein, be that carrier aggregation sub-district 1 is by (the CC1 on CC1 and the CC2, PCI1) and (CC2, PCI2) form, (CC1 is PCI1) with (CC2, PCI2) only broadcasting has the resident necessary system message of UE in the LTE system now, does not promptly broadcast the relevant information of other CC.There are two component carrier CC3 and CC4 in carrier aggregation sub-district 2, promptly carrier aggregation sub-district 2 by on CC3 and the CC4 (CC3, PCI3) and (CC4 PCI4) forms, (CC3, PCI3) and (CC4, PCI4) broadcast mechanism of system message is with carrier aggregation sub-district 1.As shown in Figure 6, the ambiguity concrete grammar of RRC connection reconstruction parameter is as follows in the present embodiment solution carrier aggregation sub-district:
S601:UE IDLE attitude cell selecting to component carrier (CC1, PCI1); UE initiates professional, UE is in that (CC1 PCI1) sets up RRC and connects, and base station 1 is notice UE component carrier (CC2 in setting up the process that RRC connects, PCI2) PCI, frequency, information such as bandwidth, UE is according to this message pick-up (CC2, PCI2) enterprising line data transmits on the necessary system message, such as MIB, SIB1, SIB2 etc.; Because current service traffics need, afterwards, base station 1 (serving BS) component carrier (CC1, on basis PCI1) again for UE distributed component carrier (CC2, PCI2), optionally, base station 1 can also be distributed the T311 value of this UE special use for this UE, and embodiment can be to adopt existing RRC dedicated signaling, such as, the RRC connection is reshuffled, and also can be increases new RRC dedicated signaling on the existing protocol basis.Be that UE is operated on component carrier CC1 and the CC2 simultaneously, base station 1 is respectively this UE and has distributed Radio Network Temporary Identifier C-RNTI1 and C-RNTI2 on CC1 and CC2;
S602:UE 1 carries out in the process of transfer of data in the carrier aggregation sub-district, and Radio Link Failure successively takes place for component carrier CC1 and CC2;
S603:UE judges that Radio Link Failure has taken place for CC1 and CC2, initiates RRC connection reconstruction flow process.UE starts timer T311, if the base station 1 T311 value special-purpose for this UE has distributed, then timer is got this value; If base station 1 does not have to distribute special-purpose T311 value for this UE, then UE can independently select the T311 value that a job is broadcasted on the carrier wave, such as, UE can select successfully to set up the carrier wave of RRC connection (to be (CC1 in the present embodiment, PCI1), perhaps selecting the last carrier wave that Radio Link Failure takes place (is CC2 in the present embodiment, PCI2), perhaps select the carrier wave of the acquiescence ad-hoc location of UE and network convention, such as the minimum component carrier of all component carrier medium frequencys (is (CC1 in the present embodiment, PCI1), specifically select rule that parameter on which component carrier carries out the RRC connection reconstruction by UE and network make an appointment (title predetermined policy).UE hangs every other Signaling Radio Bearer (SRB comprises SRB1 and SRB2) and the Data Radio Bearer (DRB) except SRB0, carries out cell selecting;
S604:UE before T311 is overtime, successfully choose carrier aggregation sub-district 2 component carrier (CC3, PCI3) on, UE stops timer T311;
S605:UE sends the request of RRC connection reconstruction to base station 2 (target BS).If the T311 value that base station 1 is special-purpose for UE has distributed, when then UE sends the request of RRC connection reconstruction, can independently select a PCI and a C-RNTI on the work carrier wave, concrete system of selection is with the method for S603, and calculate shortMAC-I according to this PCI and C-RNTI and other relevant parameters, PCI, C-RNTI and shortMAC-I send to base station 2.If special-purpose T311 value is not distributed for UE in base station 1, when then UE sends the request of RRC connection reconstruction, carry PCI and C-RNTI on the selected component carrier when selecting T311, and calculate shortMAC-I according to this PCI and C-RNTI and other relevant parameters, PCI, C-RNTI and shortMAC-I send to base station 2;
S606: after the RRC connection reconstruction request of UE is received in base station 2, at the UE of carrier aggregation sub-district 1 context, send the reconstruction signaling to this UE according to UE context according to the content search UE that carries in the request of RRC connection reconstruction;
After S607:UE receives RRC connection reconstruction signaling, extract configuration parameter and carry out radio-resource-configuration, recover the configuration of SRB1, activate the safety of Access Layer again, send the signaling that the RRC connection reconstruction is finished to Target cell.
Fig. 7 shows the schematic diagram of UE from carrier cell RRC connection reconstruction to the LTE sub-district in accordance with a preferred embodiment of the present invention.As shown in Figure 7, suppose the carrier aggregation sub-district and the LTE sub-district that have one to belong to base station 1 and base station 2 in the current system.There are two component carrier CC1 and CC2 in the carrier aggregation sub-district, be that carrier aggregation sub-district 1 is by (the CC1 on CC1 and the CC2, PCI1) and (CC2, PCI2) form, (CC1, PCI1) and (CC2, PCI2) the resident necessary system message of UE in the existing LTE system of broadcasting are not only promptly broadcasted the relevant information of other CC.
Fig. 8 show UE according to an embodiment of the invention according to the present invention from carrier cell RRC connection reconstruction to the carrier aggregation of LTE sub-district the flow chart of method of radio resource control connection reestablishment.As shown in Figure 8, the ambiguity concrete grammar of RRC connection reconstruction parameter is as follows in the present embodiment solution carrier aggregation sub-district:
S801:UE IDLE attitude cell selecting to component carrier (CC1, PCI1); UE initiates professional, UE is in that (CC1 PCI1) sets up RRC and connects, and base station 1 (serving BS) be notice UE component carrier (CC2 in setting up the process that RRC connects, PCI2) PCI, frequency, information such as bandwidth, UE is according to this message pick-up (CC2, PCI2) enterprising line data transmits on the necessary system message, such as MIB, SIB1, SIB2 etc.; Because current service traffics need, afterwards, base station 1 component carrier (CC1, on basis PCI1) again for UE distributed component carrier (CC2, PCI2), and specify this UE at the employed common parameter reference component of RRC connection status carrier wave (CC2, PCI2), embodiment can be to adopt existing RRC dedicated signaling, such as, the RRC connection is reshuffled, and also can be increases new RRC dedicated signaling on the existing protocol basis.Be that UE is operated on component carrier CC1 and the CC2 simultaneously, base station 1 is respectively this UE and has distributed Radio Network Temporary Identifier C-RNTI1 and C-RNTI2 on CC1 and CC2;
S802:UE 1 carries out in the process of transfer of data in the carrier aggregation sub-district, measurement report and corresponding radio resource management algorithm that base station 1 reports according to UE, judgement need switch to the LTE sub-district to UE, and UE switches to the LTE sub-district according to the switching command of base station 1, but handoff failure;
After S803:UE judges handoff failure, initiate RRC connection reconstruction flow process.UE judges that according to the indication of base station 1 CC2 is the reference component carrier wave of this UE at the employed common parameter of RRC connection status, so UE starts timer T311, the timer value is (CC2, the T311 value of PCI2) being broadcasted among the SIB2.UE hangs every other Signaling Radio Bearer (SRB comprises SRB1 and SRB2) and the Data Radio Bearer (DRB) except SRB0, carries out cell selecting;
S804:UE successfully chooses before T311 is overtime on the LTE sub-district, and UE stops timer T311;
S805:UE sends the request of RRC connection reconstruction to base station 2 (target BS), UE knows that according to carrier aggregation sub-district 1 system message the component carrier of common parameter institute reference in the carrier aggregation sub-district 1 is CC2, so the UE PCI and the C-RNTI that carry in this request are respectively PCI2 and C-RNTI2, and the shortMAC-I that calculates according to PCI2 and C-RNTI2 and other relevant parameters;
S806: after the RRC connection reconstruction request of UE is received in base station 2, at the UE of carrier aggregation sub-district 1 context, send the reconstruction signaling to this UE according to UE context according to the content search UE that carries in the request of RRC connection reconstruction;
After S807:UE receives RRC connection reconstruction signaling, extract configuration parameter and carry out radio-resource-configuration, recover the configuration of SRB1, activate the safety of Access Layer again, send the signaling that the RRC connection reconstruction is finished to Target cell.
In an embodiment of the present invention, the device of RRC connection reconstruction in a kind of carrier aggregation also is provided, this device is used for user equipment (UE) according to the parameter on the specified component carrier of serving BS, perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the radio resource control RRC connection reconstruction.
Fig. 9 shows the schematic representation of apparatus of RRC connection reconstruction in the carrier aggregation according to an embodiment of the invention, and this device specifically comprises:
Rebuild request module 10, be used for UE according to the parameter on the specified component carrier of serving BS, perhaps UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, target BS under proper cell sends the request of RRC connection reconstruction, wherein, UE is operated on two component carriers at least;
In the present embodiment, when the UE on being operated at least two component carriers initiates the RRC connection reconstruction, select parameter on the corresponding component carrier according to predetermined policy, and then initiate the RRC connection reconstruction according to the parameter of selected uniqueness, when having overcome the LTE-A UE that is operated in simultaneously in the prior art on a plurality of component carriers and in the carrier aggregation sub-district, having initiated the RRC connection reconstruction, above-mentioned T311, PCI, the isoparametric ambiguity that exists of C-RNTI causes the problem that the RRC connection reconstruction can not effectively be set up in the carrier aggregation sub-district.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method for radio resource control connection reestablishment in the carrier aggregation is characterized in that:
User equipment (UE) is according to the parameter on the specified component carrier of serving BS, and perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the radio resource control RRC connection reconstruction.
2. method according to claim 1 is characterized in that, UE is according to the parameter on the specified component carrier of serving BS, and perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the RRC connection reconstruction and specifically comprises:
UE is according to the parameter on the specified component carrier of serving BS, perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, target BS under described proper cell sends the request of RRC connection reconstruction, wherein, described UE is operated on two component carriers at least;
Described target BS is according to the UE context of the described UE of parameter query that carries in the request of described RRC connection reconstruction, and sends RRC connection reconstruction signaling according to described UE context to described UE;
Described UE carries out self configuration after receiving described RRC connection reconstruction signaling, and finishes signaling to described target BS transmission RRC connection reconstruction.
3. method according to claim 2 is characterized in that, described UE all has the carrier aggregation ability with its described network that is connected.
4. method according to claim 2, it is characterized in that, UE is according to the parameter on the specified component carrier of serving BS, perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, the target BS under described proper cell sends the request of RRC connection reconstruction and specifically comprises:
The T311 value of the component carrier of common parameter institute reference or described serving BS are the special-purpose T311 value that described UE distributes at least two component carriers of UE that described serving BS is specified work, perhaps select T311 value on the corresponding component carrier as the value of described UE startup timer T311 according to predetermined policy described UE;
Described UE hangs every other Signaling Radio Bearer and the Data Radio Bearer outside the Signaling Radio Bearer 0, carries out cell selecting;
Described UE successfully chooses on the component carrier of described proper cell before described timer T311 is overtime, and stops described timer T311.
5. method according to claim 2 is characterized in that, the specified component carrier of serving BS is the component carrier of described serving BS appointment in space interface signaling.
6. method according to claim 5 is characterized in that, described space interface signaling is system message or special RRC signaling.
7. method according to claim 2 is characterized in that, described UE selects the parameter on the corresponding component carrier specifically to comprise according to predetermined policy:
When described UE selected generation RRC connection reconstruction that described UE and network make an appointment, described UE selected the parameter on the specific component carrier.
8. method according to claim 2 is characterized in that, described UE selects the parameter on the corresponding component carrier specifically to comprise according to predetermined policy:
Described UE selects described UE the last time successfully to set up the component carrier that RRC connects, and the component carrier of the detected last generation Radio Link Failure of perhaps described UE is perhaps given tacit consent to the parameter on the component carrier of ad-hoc location.
9. method according to claim 2 is characterized in that, described parameter comprises following at least a:
T311 value, Physical Cell Identifier and Radio Network Temporary Identifier.
10. the device of radio resource control connection reestablishment in the carrier aggregation, it is characterized in that, be used for user equipment (UE) according to the parameter on the specified component carrier of serving BS, perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, carries out the radio resource control RRC connection reconstruction.
11. device according to claim 10 is characterized in that, comprising:
Request module, be used for UE according to the parameter on the specified component carrier of serving BS, perhaps described UE selects parameter on the corresponding component carrier according to predetermined policy, and according to proper cell of parameter selection, target BS under described proper cell sends the request of RRC connection reconstruction, wherein, described UE is operated on two component carriers at least;
Enquiry module is used for the UE context of the described target BS described UE of parameter query that request is carried according to described RRC connection reconstruction, and sends RRC connection reconstruction signaling according to described UE context to described UE;
Confirm module, be used for carrying out self configuration after described UE receives described RRC connection reconstruction signaling, and finish signaling to described target BS transmission RRC connection reconstruction.
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