CN101848506A - Switching method in long-termed evolution enhancing system and system - Google Patents
Switching method in long-termed evolution enhancing system and system Download PDFInfo
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Abstract
The invention discloses a switching method in a long-termed evolution enhancing system and the system. The method comprises the following steps that: UE receives configuration information that a source eNB sends to SCC and current PCC; when UE supports single-carrier access and after the access of the current PCC fails, whether all SCCs can serve as backup PCCs is judged according to the configuration information, all the SCCs are sequentially accessed according to the priority of the backup PCCs until the access succeeds, the accessed SCC serves as the current PCC, a switching complete message is sent to a target eNB, and the current PCC is marked; and when UE supports and simultaneously accesses a plurality of CCs, according to the configuration information, a plurality of CCs are accessed simultaneously, if the current PCC fails to be accessed but the backup PCC is successfully accessed, the SCC which is successfully accessed and has the highest priority is found out according to the configuration information and serves as the current PCC, and the switching completion message is sent to the target eNB. In the method, UE can be quickly connected to a community with the best access quality, the access time is short and the process is simple.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to changing method and system in a kind of long-term evolution enhancement system.
Background technology
After Long Term Evolution (LTE, the Long Term Evolution) technology of 3GPP, the 3GPP tissue continues the LTE scheme is strengthened, and this technique for enhancing is called the LTE enhancing, and (promptly LTE-A is the follow-up evolution of LTE technology for LTE-A, LTE-Advanced) technology.
In the LTE system, subscriber equipment (UE) only supports that going up access evolution base station (eNB) from a member carrier (CC, Component carrier) carries out transfer of data, like this, UE during handoff failure, can adopt the processing method of Rel-8 handoff failure to handle carrying out that the sub-district is switched.The process flow figure of Rel-8 handoff failure in the LTE system that Fig. 1 provides for prior art.As shown in Figure 1, the process flow of Rel-8 handoff failure is in the LTE system:
Step 101 after source eNB receives the RRC measurement report of UE transmission, sends switching simultaneously to target eNB, the eNB that switches preparation and other eNB and prepares message, is used to notify these eNB to carry out the preparation that switching inserts;
Step 102, source eNB receives after switching that target eNB, the eNB that switch to prepare and other eNB beam back prepares acknowledge message, sends the RRC reconfiguration message to UE, and promptly switching command is used to notify UE to carry out the sub-district and switches; UE sends to source eNB and mixes automatic repeat requests acknowledge message, begins to carry out the sub-district and switches;
Step 103, switching timer T304 starts and carries out timing, and in the timing range of T304, UE attempts inserting Target cell always, until inserting successfully;
Step 104, when switching timer T304 was overtime, the sub-district handoff failure of UE then started switching timer T311, and UE carries out cell selecting again; In the timing range of T311, if UE searches source eNB, target eNB, eNB that switch to prepare or the sub-district under other eNB and see fit, then that this sub-district is affiliated eNB is as eNB to be accessed, at Random Access Channel (RACH, Radam Access Chanel) goes up to eNB transmission random access sequence (RA Preamble) to be accessed, after receiving the answer of access at random of eNB to be accessed, send RRC to eNB to be accessed and rebuild request, eNB to be accessed sends RRC to UE and rebuilds message, thereby make UE be linked into eNB to be accessed, UE sends the RRC reconstruction to eNB to be accessed and finishes message, finally finishes radio link failure recovery process; Then, eNB to be accessed sends the RRC reconfiguration message to UE, after UE reshuffles and finishes, sends RRC to eNB to be accessed and reshuffles and finish message;
Step 105, when switching timer T311 was overtime, RRC connection reconstruction procedure failure, UE entered RRC free time (RRC_IDLE) state.
In the LTE-A system, in order to obtain higher peak data rate, 3GPP only supports from the basis that a CC inserts at the UE of original regulation, another method also has been discussed, be that UE supports to insert on a plurality of CC simultaneously, thereby obtain bigger bandwidth to carry out transfer of data, this method is called member carrier polymerization or bandwidth polymerization, and the maximum bandwidth during the member carrier polymerization can reach 100MHz.
When the LTE-A system adopts the member carrier polymerization to carry out transfer of data in the prior art, if final solution is not determined in the failure of UE switching cell at present as yet.
In Rel-8 handoff failure processing method, when reselecting sub-district to be accessed, UE more at random, so just caused the sub-district cut-in quality of UE not guarantee, and turn-on time is long, and the process of access is more complicated also.
Summary of the invention
The invention provides the changing method in a kind of long-term evolution enhancement system, when the subscriber equipment switching cell was failed, the subscriber equipment in this method can be connected to the best sub-district of cut-in quality fast, and turn-on time is shorter, and access procedure is also fairly simple.
The present invention also provides the switched system in a kind of long-term evolution enhancement system, and when the subscriber equipment switching cell was failed, the subscriber equipment in this system can be connected to the best sub-district of cut-in quality fast, and turn-on time is shorter, and access procedure is also fairly simple.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of Long Term Evolution and strengthen changing method in the LTE-A system, this method comprises:
User equipment (UE) is received the configuration information to current main member carrier PCC and each auxilliary member carrier SCC that the source evolution base station eNB sends, described configuration information comprises: the identification information of current PCC and each SCC, indicate each SCC whether to can be used as the information of standby PCC, and the information of the priority of each SCC;
Under the situation of only supporting to insert from a CC at UE, when UE received the switching command of source eNB transmission, UE preferentially attempted inserting current PCC; If the current PCC access failure, then UE judges according to the configuration information of described each SCC whether each SCC can be used as standby PCC, and obtains can be used as the priority orders of the SCC of standby PCC; UE attempts the highest SCC that can be used as standby PCC of access priority, if insert successfully, then that described priority is the highest SCC that can be used as standby PCC is as current PCC, if access failure, then UE attempts the access priority time high SCC that can be used as standby PCC, until inserting successfully, and with the SCC that can be used as standby PCC that inserted as current PCC; UE sends handoff completion message to target eNB;
Support the while under situation about inserting on a plurality of CC at UE, when UE received the switching command of source eNB transmission, UE inserted a plurality of CC that comprise described current PCC and all or part of SCC simultaneously according to the configuration information of described current PCC and each SCC; If UE inserts the current PCC failure, but comprise a SCC who can be used as standby PCC at least among the SCC that success inserts, then UE is according to the configuration information of described SCC, the SCC that can be used as standby PCC that the priority that finds UE successfully to insert is the highest, and with the SCC that found as current PCC; UE sends handoff completion message to target eNB.
The invention also discloses the switched system in a kind of LTE-A system, this system comprises source evolution base station, subscriber equipment and target evolution base station, wherein,
The source evolution base station is used for to the configuration information of subscriber equipment transmission to current PCC and each SCC, and described configuration information comprises: the identification information of current PCC and each SCC, and indicate each SCC whether to can be used as the information of standby PCC, and the information of the priority of each SCC; Send switching command to subscriber equipment;
Subscriber equipment is used for the configuration information to SCC and current PCC that the reception sources evolution base station sends; Self only supporting that under the situation about inserting from a CC, when receiving the switching command that the source evolution base station sends, preferential trial inserts current PCC; If the current PCC access failure then according to the configuration information of described SCC, judges whether each SCC can be used as standby PCC, and obtain can be used as the priority orders of the SCC of standby PCC; Attempt the highest SCC that can be used as standby PCC of access priority; If insert successfully, then that described priority is the highest SCC that can be used as standby PCC is as current PCC, if access failure is then attempted the access priority time high SCC that can be used as standby PCC, until inserting successfully, and with the SCC that can be used as standby PCC that inserted as current PCC; Send handoff completion message to target evolution base station; Self supporting the while under situation about inserting on a plurality of CC, when receiving the switching command that the source evolution base station sends,, insert a plurality of CC that comprise described current PCC and all or part of SCC simultaneously according to described configuration information to SCC and current PCC; If insert the current PCC failure, but comprise a SCC who can be used as standby PCC at least among the SCC that success inserts, then according to the configuration information of described SCC, find the highest SCC that can be used as standby PCC of priority that successfully inserts, and with the SCC that found as current PCC; Send handoff completion message to target evolution base station;
Target evolution base station is used to receive the handoff completion message that subscriber equipment sends.
This shows, among the present invention, because what UE received can reflect the performance index of each CC more exactly to the configuration information of SCC and current PCC, quality is fine, therefore, no matter be under the situation that UE only supports to insert from a CC, still support simultaneously under situation about inserting on a plurality of CC at UE, when UE inserts the current PCC failure, can obtain can be used as the priority orders of the SCC of standby PCC according to configuration information to SCC, and be linked into the highest SCC of priority that can insert, thereby make cut-in quality reach best.And, because UE utilizes the configuration information to SCC and current PCC to carry out the sub-district switching among the present invention, when having reduced direct employing Rel-8 handoff failure processing method required carry out carry out the step that Cell searching and system information read again, therefore, with respect to prior art, turn-on time of the present invention is shorter, and access procedure is also fairly simple.
Description of drawings
The process flow figure of Rel-8 handoff failure in the LTE system that Fig. 1 provides for prior art;
Fig. 2 is the changing method flow chart in the LTE-A provided by the invention system;
Fig. 3 is the flow chart of the handover success under the situation of only supporting to insert from a CC of UE in the LTE-A system in the embodiment of the invention;
Fig. 4 is the flow chart of the handoff failure under the situation of only supporting to insert from a CC of UE in the LTE-A system in the embodiment of the invention;
Fig. 5 supports the flow chart of handover success under situation about inserting on a plurality of CC simultaneously for UE in the LTE-A system in the embodiment of the invention;
Fig. 6 supports the flow chart of handoff failure under situation about inserting on a plurality of CC simultaneously for UE in the LTE-A system in the embodiment of the invention;
Fig. 7 is the switched system figure in the LTE-A provided by the invention system.
Embodiment
Core concept of the present invention is: UE receive that source eNB sends to current main member carrier (PCC, Primary CC) and each auxilliary member carrier (SCC, Secondary CC) behind the configuration information, under the situation of only supporting to insert at UE from a CC, if UE inserts the current PCC failure, then according to the configuration information of the SCC that receives, judge whether each SCC can be used as standby PCC, and obtain can be used as the priority orders of the SCC of standby PCC, UE is according to this priority orders, attempt the highest SCC that can be used as standby PCC of access priority, insert successfully then this SCC as current PCC, access failure is then attempted the access priority time high SCC that can be used as standby PCC, until inserting successfully, as current PCC, UE sends handoff completion message to target eNB then with the SCC that inserted, and this handoff completion message can help target eNB to upgrade the current PCC of self this UE of side; Support simultaneously under situation about inserting on a plurality of CC at UE, UE is according to the configuration information to SCC and current PCC, insert a plurality of CC that comprise current PCC and all or part of SCC simultaneously, if UE inserts the current PCC failure, but comprise a SCC who can be used as standby PCC at least among the SCC that success inserts, then UE is according to the configuration information of SCC, the SCC that can be used as standby PCC that the priority that finds UE successfully to insert is the highest, with this SCC of being found as current PCC, and to target eNB transmission handoff completion message, this handoff completion message can help the current PCC of target eNB renewal self this UE of side.
Like this, because what UE received can reflect the performance index of each CC more exactly to the configuration information of SCC and current PCC, quality is fine, therefore, no matter be under the situation that UE only supports to insert from a CC, still support simultaneously under situation about inserting on a plurality of CC at UE, when UE inserts the current PCC failure, can obtain can be used as the priority orders of the SCC of standby PCC according to the configuration information of SCC, and when being linked into the highest SCC of the priority that can insert, so just obtained best cut-in quality.And, because UE utilizes the configuration information to SCC and current PCC to carry out the sub-district switching among the present invention, when having reduced direct employing Rel-8 handoff failure processing method required carry out carry out the step that Cell searching and system information read again, therefore, with respect to prior art, turn-on time of the present invention is shorter, and access procedure is also fairly simple.
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Fig. 2 is the changing method flow chart in the LTE-A provided by the invention system.As shown in Figure 2, this method may further comprise the steps:
Step 201:UE receives the configuration information to current PCC and each SCC that source eNB sends.
Here, in the LTE-A system, each UE can only have a current PCC, and when the member carrier polymerization, each UE can insert a plurality of CC that comprise a current PCC and an above SCC simultaneously.
The CC that UE can insert can be divided three classes, and they are respectively backward compatibility carrier wave, non-backward compatible carrier waves and expansion carrier wave.Wherein, the backward compatibility carrier wave is the CC that any UE can insert, non-backward compatible carrier waves is to only inserting the UE that has defined this carrier wave, and these two kinds of CC can independently undertake the task of transfer of data, the part among the CC that UE inserts simultaneously in the time of also can be as the member carrier polymerization; And the expansion carrier wave can not independently be undertaken the task of transfer of data, the part among the CC that UE inserts simultaneously in the time of can only be as the member carrier polymerization.Owing to must have the task of can independently undertake transfer of data at least among the CC that UE inserted, and the current PCC described in the present invention must independently be undertaken data transfer task with the SCC that can be used as standby PCC, therefore, current PCC described in the present invention can only be backward compatibility carrier wave or non-backward compatible carrier waves with the SCC that can be used as standby PCC, can not select the expansion carrier wave for use.Like this, in the LTE-A system, each sub-district can only be corresponding to the transfer of data on backward compatibility carrier wave or the non-backward compatible carrier waves.After UE inserted current PCC or can be used as the SCC of standby PCC, this UE just had been linked into current PCC or has can be used as the pairing sub-district of SCC of standby PCC, and this UE just can communicate with pairing source eNB in this sub-district or target eNB like this.
Each sub-district all has the cellular global identity (E-CGI, Evolu-tionary-Cell Global Identification) of unique evolution.Particular cell can be used to provide security information and Non-Access Stratum (NAS, Non-Access Stratum) mobility information.Each UE can insert a plurality of sub-districts, but can only insert a particular cell.
In this step, the configuration information to current PCC and each SCC that UE receives comprises: the type of each CC, the identification information of current PCC and each SCC indicates each SCC whether to can be used as the information of standby PCC, and the information of the priority of each SCC.Because this configuration information derives from the measurement report of UE to each CC, thereby can reflect the performance index of each CC that comprises SCC and current PCC more exactly, quality is fine.
Because the UE in the LTE-A system both can only support to insert from a CC, promptly support single carrier to insert, can adopt the method for member carrier polymerization again, support on a plurality of CC, to insert simultaneously, therefore, when the UE switching cell, the present invention handles in two kinds of situation, under the situation of only supporting to insert at UE from a CC, and execution in step 202 to 211, support the while under situation about inserting on a plurality of CC at UE, execution in step 208,211 to 216.
Step 202: under the situation of only supporting to insert from a CC at UE, when UE received the switching command of source eNB transmission, UE preferentially attempted inserting current PCC.
Here, the relevant information of the current PCC that UE attempted inserting is to obtain according to the configuration information to current PCC that source eNB sends.
Step 203:UE judges whether the access current PCC is successful, if then execution in step 208, otherwise execution in step 204.
Step 204:UE judges according to the configuration information of SCC whether each SCC can be used as standby PCC, and obtains can be used as the priority orders of the SCC of standby PCC.
Here, because the configuration information of each SCC that receives in the step 201 can reflect the performance index of each SCC more exactly, quality is fine, therefore, the priority orders of the SCC that can be used as standby PCC that this step obtains, can reflect the cut-in quality after UE is connected to these SCC well, promptly the priority of the SCC that UE inserted is high more, illustrates that cut-in quality is good more.Therefore, utilize the present invention, UE can find the best SCC of cut-in quality among the SCC that can be used as standby PCC at an easy rate after inserting the current PCC failure, thereby guarantees the cut-in quality that switch the sub-district, and reduces turn-on time, reduces the complexity of access procedure.
Step 205:UE attempts the highest SCC that can be used as standby PCC of access priority.
Step 206:UE judges whether successfully to insert the SCC that this can be used as standby PCC, if then the SCC that UE inserted is exactly the best SCC of cut-in quality during switch this sub-district, execution in step 207, otherwise execution in step 209.
Here, if the SCC that UE attempted inserting both can be the highest SCC that can be used as standby PCC of priority described in the step 205, also can be time high SCC that can be used as standby PCC of priority described in the step 210.
Step 207:UE with this SCC that can be used as standby PCC as current PCC.
Here, the SCC that UE successfully inserts can be the highest SCC that can be used as standby PCC of priority described in the step 205, also can be time high SCC that can be used as standby PCC of priority described in the step 210, under the both of these case, the SCC that UE inserted must be the best SCC of cut-in quality in this sub-district switching, therefore, UE with the SCC that can be used as standby PCC that inserted as current PCC after, just arrived best cut-in quality.
Step 208:UE sends handoff completion message to target eNB.
Here, UE sends the purpose of handoff completion message to target eNB, be current PCC notification target eNB for self has been switched to, make can upgrade in time the current PCC of self this UE of side of target eNB, and reshuffling (RRC connection reconfiguration) message to the connection of UE transmission radio resource control whenever necessary, thereby reshuffle the current PCC of UE.
Whether all step 209:UE judges the SCC access failure can be used as standby PCC, if then execution in step 211, otherwise execution in step 210.
Step 210:UE attempts the access priority time high SCC that can be used as standby PCC, and returns execution in step 206.
Here, the priority time high SCC that can be used as standby PCC is meant that priority is lower than the SCC SCC of one-level only that can be used as standby PCC described in the step 206.Owing to judge the UE access failure in the step 206, and judge to also have in the step 209 UE do not tried into the SCC that can be used as standby PCC exist, therefore, time high SCC that can be used as standby PCC of priority described in this step is the best SCC of cut-in quality that UE may be connected in this switches.
Step 211:UE changes the Rel-8 handoff failure processing procedure in the LTE system over to.
Here, UE can not insert any SCC that can be used as standby PCC, therefore, handles according to Rel-8 handoff failure processing procedure of the prior art.
Step 212: support the while under situation about inserting on a plurality of CC at UE, when UE received the switching command of source eNB transmission, UE inserted a plurality of CC that comprise current PCC and all or part of SCC simultaneously according to the configuration information to SCC and current PCC.
Here, support the while under situation about inserting on a plurality of CC at UE, what system adopted is the member carrier polymerization, and therefore, UE can insert a plurality of CC that comprise current PCC and all or part of SCC simultaneously, but in these a plurality of CC, must comprise current PCC.
Step 213:UE judges whether the access current PCC is successful, if then execution in step 208, otherwise execution in step 214.
Step 214:UE judges among the SCC that successfully inserts whether comprise a SCC who can be used as standby PCC at least, if then execution in step 215, otherwise execution in step 211.
Step 215:UE is according to the configuration information to SCC, the SCC that can be used as standby PCC that the priority that finds UE successfully to insert is the highest.
Here, step 213 judges that UE inserts the current PCC failure, but comprise a SCC who can be used as standby PCC at least among the SCC that step 214 judgement UE successfully inserts, therefore, UE need select the best SCC that can be used as standby PCC of cut-in quality to insert, and the method for selection is: according to the configuration information that UE in the step 201 receives to SCC, and the priority orders of the SCC that can be used as standby PCC of the access of succeeding, select the highest SCC of priority to insert, cut-in quality is good more like this.
Step 216:UE incites somebody to action the highest SCC of the successful SCC medium priority that can be used as standby PCC that inserts as current PCC, execution in step 208.
Here, the SCC that priority is the highest is this UE best SCC of cut-in quality in switch this sub-district, and therefore, UE incites somebody to action the highest SCC of the successful SCC medium priority that can be used as standby PCC that inserts as current PCC, and execution in step 208.
This shows, among the present invention, because what UE received can reflect the performance index of each CC more exactly to the configuration information of SCC and current PCC, quality is fine, therefore, no matter be under the situation that UE only supports to insert from a CC, still support simultaneously under situation about inserting on a plurality of CC at UE, when UE inserts the current PCC failure, can obtain the priority orders of standby PCC according to the configuration information of SCC, priority according to each SCC can insert the highest standby PCC of priority that can insert, thereby obtains best cut-in quality.And, because UE utilizes the configuration information to SCC and current PCC to carry out the sub-district switching among the present invention, when having reduced direct employing Rel-8 handoff failure processing method required carry out carry out the step that Cell searching and system information read again, therefore, with respect to prior art, turn-on time of the present invention is shorter, and access procedure is also fairly simple.
The configuration information that UE receives in the step 201 is included in the switching command of source eNB transmission.In addition, the information that whether included each SCC of indication can be used as standby PCC in the described configuration information of step 201 has two kinds, first kind is the E-CGI of SCC place frequency and respective cell thereof, only for the SCC that can be used as standby PCC, the E-CGI that just comprises this SCC in the configuration information, for cannot only comprising SCC place frequency in the configuration information, and do not comprise the E-CGI of this SCC as the SCC of standby PCC; Second kind is the above standby PCC indication information of 1bit, for the SCC that can be used as standby PCC and cannot be as the SCC of standby PCC, in configuration information, distinguished with different standby PCC indication informations respectively, for example, when source eNB is provided with the standby PCC indication information of 1bit in configuration information, can represent that this SCC cannot be as standby PCC with symbol 0, and represent that with symbol 1 this SCC can be used as standby PCC.
Source eNB is before sending switching command, further, source eNB judges whether each SCC satisfies three criterions simultaneously, if, then source eNB indicates this SCC to can be used as standby PCC in configuration information, otherwise source eNB indicates this SCC cannot be as standby PCC in configuration information, and these three criterions are:
First criterion: this SCC is backward compatibility carrier wave or non-backward compatible carrier waves;
Second criterion: this SCC meets the standard that the sub-district is inserted;
The 3rd criterion: this SCC does not belong to the forbidding public land mobile communication network of UE.
In second criterion, source eNB judges to the measurement report of this SCC whether this SCC meets the sub-district and insert standard according to UE.
Further, under the situation of only supporting to insert at UE from a CC, before source eNB sends described switching command, source eNB according to UE to the measurement report of each SCC and the load of each SCC, determine to can be used as the priority orders of each SCC of standby PCC, the method for determining is:
The measurement report of this SCC shows that the access standard that the cut-in quality of this SCC exceeds the sub-district is many more, and the priority of this SCC is high more;
Load on the SCC is more little, and the priority of this SCC is high more.
For instance, on the one hand, if the cut-in quality of SCC1 and SCC2 all exceeds the access standard of sub-district, and the cut-in quality of SCC1 to exceed the access standard of sub-district more more, it is the cut-in quality that the cut-in quality of SCC1 is better than SCC2, on the other hand, the duty ratio SCC2's of SCC1 is smaller, and then source eNB can determine that the priority of SCC1 will be higher than the priority of SCC2.
If the cut-in quality of SCC1 and SCC2 all exceeds the access standard of sub-district, and the cut-in quality of SCC1 to exceed the access standard of sub-district more more, but the duty ratio SCC2's of SCC1 is big, then when determining the priority of the two, should take all factors into consideration the cut-in quality of SCC1 and SCC2 and load these two factors.For example, can pay the utmost attention to the factor of cut-in quality, because the cut-in quality of SCC1 is more excellent, thereby source eNB determines that the priority of SCC1 is higher than SCC2.Certainly, the present invention can also pay the utmost attention to the load factor of SCC, and promptly because the load of SCC2 is smaller, thereby source eNB determines that the priority of SCC2 is higher than SCC1.
After source eNB has determined to can be used as the priority of each SCC of standby PCC, need in configuration information, the priority orders to each SCC be described.Among the present invention, the information of the priority of each SCC is: the precedence that information element (IE, Information Element) occurs, and IE order occurs more by the SCC of elder generation in the configuration information, and its priority is high more.Like this, UE receives in step 201 after the configuration information, just can judge the priority of each SCC according to the order that IE in the configuration information occurs.
Under the situation of only supporting to insert at UE from a CC, the SCC that can be used as standby PCC that UE will success inserts in the step 207 as current PCC after, UE described in the step 208 sends handoff completion message to target eNB: UE sends handoff completion message to target eNB on current PCC, send mode can send handoff completion message to target eNB for the safety input that is adopted as the particular cell configuration, comprise the current PCC sign in this handoff completion message, perhaps the E-CGI of current PCC respective cell.Like this, target eNB is after receiving this handoff completion message that UE sends, can be according to the E-CGI of sign of the current PCC in the handoff completion message or current PCC respective cell, with the current PCC of indicating in the handoff completion message or the pairing SCC of E-CGI current PCC as self this UE of side, having under the situation about needing, when for example target eNB need reconfigure the parameter of current PCC of UE, target eNB can send radio resource control to UE and connect and reshuffle (RRC connectionreconfiguration) message.
Support simultaneously under situation about inserting on a plurality of CC at UE, the highest SCC of the SCC medium priority that can be used as standby PCC that UE will success inserts in the step 216 as current PCC after, the described UE of step 208 sends handoff completion message to target eNB: the safety input that UE is adopted as the particular cell configuration sends handoff completion message to target eNB, comprise the current PCC sign in this handoff completion message, or the E-CGI of current PCC respective cell.Like this, target eNB is after receiving the handoff completion message that UE sends, can be according to the E-CGI of sign of the current PCC in the handoff completion message or current PCC respective cell, with the current PCC of indicating in the handoff completion message or the pairing SCC of E-CGI current PCC as self this UE of side, having under the situation about needing, when for example target eNB need reconfigure the parameter of current PCC of UE, target eNB sent RRC connection reconfiguration message to UE.
This shows, in the present invention, the UE of LTE-A system both can only support to insert from a CC, can support again on a plurality of CC, to insert simultaneously, all may finally insert success or access failure again in both cases, below these four kinds of situations are divided into four specific embodiments, are illustrated respectively with Fig. 3, Fig. 4, Fig. 5 and Fig. 6.In Fig. 3, Fig. 4, Fig. 5 and Fig. 6, source PCC/SCC is the pairing CC of source eNB, target P CC and target SCC are the pairing CC of target eNB, switch the CC for preparing among Fig. 4 and Fig. 6 and switch the pairing CC of eNB for preparing, owing to need these different CC are distinguished among the present invention, therefore, in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, do not indicate source eNB, target eNB and switch the eNB for preparing, and indicate with corresponding C C.
Fig. 3 is the flow chart of the handover success under the situation of only supporting to insert from a CC of UE in the LTE-A system in the embodiment of the invention.As shown in Figure 3, this flow process may further comprise the steps:
Step 301:UE receives switching command, comprises the descriptor that whether each SCC be can be used as standby PCC in this switching command.
Here, source eNB utilizes source PCC or source SCC that switching command is sent to UE in this step, requires UE to switch to target eNB, and preferential the trial inserted target P CC during switching, and the target P CC here is the current PCC described in the changing method provided by the invention.
Step 302: switching timer T304 starts and carries out timing, and in the timing range of T304, UE attempts inserting target P CC always, until inserting successfully.
Step 303: when switching timer T304 is overtime, the failure of UE switching cell, reselecting proper cell inserts, cut-in method is: UE is according to the configuration information to each SCC, obtain can be used as the priority orders of the SCC of standby PCC, then that priority is the highest SCC that can be used as standby PCC is as target SCC, and trial inserts target SCC.
After step 304:UE successfully inserts target SCC, with this target SCC that successfully inserts as current PCC.
Here, if UE inserts target SCC failure, then UE attempts the access priority time high SCC that can be used as standby PCC, by that analogy, until inserting successfully, with the target SCC of successful access as current PCC.
Step 305:UE utilizes target SCC to send handoff completion message to target eNB, carries the current PCC sign after the renewal or the E-CGI of current PCC respective cell in this handoff completion message.
Fig. 4 is the flow chart of the handoff failure under the situation of only supporting to insert from a CC of UE in the LTE-A system in the embodiment of the invention.As shown in Figure 4, this flow process may further comprise the steps:
Step 401 to 403 respectively with Fig. 3 in step 301 to 303 identical, do not do at this and to give unnecessary details.
Step 404: when switching timer T304 is overtime, UE inserts target SCC failure, then the SCC that can be used as standby PCC that UE is time high with priority is as new target SCC, and trial inserts new target SCC when new switching timer T304 starts timing, if new T304 is overtime again, then repeat this step,, perhaps not can be used as till the SCC of standby PCC until all whole access failures of SCC that can be used as standby PCC.
Step 405: start switching timer T311, UE carries out cell selecting again, carries out RRC connection reconstruction process.
Step 406: if switching timer T311 is overtime, RRC connection reconstruction procedure failure, then UE changes the RRC_IDLE state over to.
Fig. 5 supports the flow chart of handover success under situation about inserting on a plurality of CC simultaneously for UE in the LTE-A system in the embodiment of the invention.As shown in Figure 5, this flow process may further comprise the steps:
Step 501 is identical with step 301 among Fig. 3, does not do at this and gives unnecessary details.
Step 502: switching timer T304 starts and carries out timing, and in the timing range of T304, UE attempts inserting a plurality of CC that comprise target P CC and all or part of SCC simultaneously according to the configuration information to target P CC and SCC.
Step 503: when switching timer T304 is overtime, UE inserts target P CC failure, but successfully insert at least one SCC, then UE is according to the configuration information to SCC, judge whether each SCC that successfully inserts can be used as standby PCC, if the SCC that can be used as standby PCC that has only a success to insert, then with this SCC as current PCC, if the SCC that can be used as standby PCC that has a plurality of successes to insert, then UE is according to the configuration information of SCC, obtain the priority orders of the SCC that can be used as standby PCC that UE successfully inserts, the SCC that priority is the highest is as current PCC.
Step 504:UE utilizes target SCC to send handoff completion message to target eNB, carries the current PCC sign after the renewal or the E-CGI of current PCC respective cell in this handoff completion message.
Fig. 6 supports the flow chart of handoff failure under situation about inserting on a plurality of CC simultaneously for UE in the LTE-A system in the embodiment of the invention.As shown in Figure 6, this flow process may further comprise the steps:
Step 601 with 602 respectively with Fig. 5 in step 501 and 502 identical, do not do at this and to give unnecessary details.
Step 603: when switching timer T304 was overtime, UE inserted target P CC failure, and the SCC that not can be used as standby PCC inserts successfully, then started timer T311 timing, and UE carries out cell selecting again, carries out RRC connection reconstruction process.
Step 604: when timer T311 is overtime, RRC connection reconstruction procedure failure, then UE changes the RRC_IDLE state over to.
Fig. 7 is the switched system figure in the LTE-A provided by the invention system.As shown in Figure 7, this system comprises source evolution base station 701, subscriber equipment 702 and target evolution base station 703, wherein,
Source evolution base station 701, be used for to the configuration information of subscriber equipment 702 transmissions to SCC and current PCC, this configuration information comprises: the type of each CC, the identification information of current PCC and each SCC, indicate each SCC whether to can be used as the information of standby PCC, and the information of the priority of each SCC; Send switching command to subscriber equipment 702;
Subscriber equipment 702 is used for the configuration information to SCC and current PCC that reception sources evolution base station 701 sends; Self only supporting that under the situation about inserting from a CC, when receiving the switching command that source evolution base station 701 sends, preferential trial inserts current PCC; If the current PCC access failure then according to the configuration information of SCC, judges whether each SCC can be used as standby PCC, and obtain can be used as the priority orders of the SCC of standby PCC; Attempt the highest SCC that can be used as standby PCC of access priority; If insert successfully, then that this priority is the highest SCC that can be used as standby PCC is as current PCC, if access failure is then attempted the access priority time high SCC that can be used as standby PCC, until inserting successfully, and with the SCC that can be used as standby PCC that inserted as current PCC; Send handoff completion message to target evolution base station 703; Self supporting the while under situation about inserting on a plurality of CC, when receiving the switching command that source evolution base station 701 sends,, insert a plurality of CC that comprise current PCC and all or part of SCC simultaneously according to configuration information to SCC and current PCC; If insert the current PCC failure, but comprise a SCC who can be used as standby PCC at least among the SCC that success inserts, then, find the highest SCC that can be used as standby PCC of priority that successfully inserts according to the configuration information of SCC, with the SCC that found as current PCC; Send handoff completion message to target evolution base station 703;
Target evolution base station 703 is used to receive the handoff completion message that subscriber equipment 702 sends.
Wherein, the configuration information that source evolution base station 701 sends to subscriber equipment 702 to current PCC and each SCC, because derive from the measurement report of 702 couples of each CC of subscriber equipment, thereby can reflect the performance index of each CC that comprises SCC and current PCC more exactly, quality is fine.
After subscriber equipment 702 successfully inserts current PCC or can be used as the SCC of standby PCC, just can communicate with this current PCC or the target evolution base station 703 that can be used as the SCC institute respective cell of standby PCC.
Between evolution base station 701 of source shown in Fig. 7 and the subscriber equipment 702 and the arrow between subscriber equipment 702 and the target evolution base station 703 be two-way, meaning needs the mutual of the information of carrying out between them.For example, subscriber equipment 702 is after source evolution base station 701 sends measurement report, and source evolution base station 701 can send the RRC reconfiguration message to subscriber equipment 702; Target evolution base station 703 sends the RRC reconfiguration message to subscriber equipment 702, subscriber equipment 702 reshuffle finish after, can send RRC to target evolution base station 703 and reshuffle and finish message.
This shows, among the present invention, because subscriber equipment 702 can reflect the performance index of each CC from what source evolution base station 701 was received more exactly to the configuration information of SCC and current PCC, quality is fine, therefore, no matter be under the situation that 702 supports of subscriber equipment insert from a CC, still support simultaneously under situation about inserting on a plurality of CC at subscriber equipment 702, when subscriber equipment 702 inserts the current PCC failure, can obtain can be used as the priority orders of the SCC of standby PCC according to the configuration information of SCC, and find the highest SCC of priority that can insert, thereby obtain best cut-in quality according to this priority orders.And, because subscriber equipment 702 utilizes the configuration information to SCC and current PCC to carry out the sub-district switching among the present invention, when having reduced direct employing Rel-8 handoff failure processing method required carry out carry out the step that Cell searching and system information read again, therefore, with respect to prior art, turn-on time of the present invention is shorter, and access procedure is also fairly simple.
The configuration information that subscriber equipment 702 receives is included in the switching command that source evolution base station 701 sends.In addition, the information that whether included each SCC of indication can be used as standby PCC in the configuration information that source evolution base station 701 sends has two kinds, first kind is the above standby PCC indication information of 1bit, to the SCC that can be used as standby PCC and cannot be as the SCC of standby PCC, adopt different standby PCC indication informations to be distinguished, for example, when the standby PCC indication information in the configuration information is 1bit, can represent that this SCC cannot be as standby PCC with symbol 0, represent with symbol 1 that this PCC can be used as and do not use PCC; Another kind is the E-CGI of SCC respective cell, for cannot in configuration information, including only the frequency at this SCC place, and do not comprise the E-CGI of this SCC respective cell as the SCC of standby PCC, only, just comprise the E-CGI of this SCC in the configuration information for the SCC that can be used as standby PCC.
Source evolution base station 701 is used to judge whether each SCC satisfies three criterions simultaneously, if then this SCC of indication can be used as standby PCC in configuration information, otherwise this SCC of indication cannot be as standby PCC in configuration information.These three criterions are:
First criterion: this SCC is backward compatibility carrier wave or non-backward compatible carrier waves;
Second criterion: this SCC meets the standard that the sub-district is inserted;
The 3rd criterion: this SCC does not belong to the forbidding public land mobile communication network of subscriber equipment 702.
In second criterion, source evolution base station 701 judges according to the measurement report of 702 couples of these SCC of subscriber equipment whether this SCC meets the sub-district and insert standard.
Under the situation that 702 supports of subscriber equipment insert from a CC, before source evolution base station 701 sends switching command, source evolution base station 701 is further used for according to the measurement report of 702 couples of each SCC of subscriber equipment and the load of each SCC, determine to can be used as the priority orders of each SCC of standby PCC, the principle of determining priority orders has two, is respectively:
First principle: the measurement report of this SCC shows that the access standard that the cut-in quality of this SCC exceeds the sub-district is many more, and the priority of this SCC is high more;
Second principle: the load on the SCC is more little, and the priority of this SCC is high more.
Source evolution base station 701 has been determined to can be used as after the priority orders of each SCC of standby PCC, carries the information of the priority of each SCC that can be used as standby PCC in configuration information.The information of the priority of each SCC is: the precedence that IE occurs, and IE order occurs more by the SCC of elder generation in the configuration information, and its priority is high more.Like this, subscriber equipment 702 just can be determined the priority of each SCC according to the precedence of IE appearance in the configuration information.
Under the situation that 702 supports of subscriber equipment insert from a CC,
Subscriber equipment 702 is used for, and sends handoff completion message to target evolution base station 703 on current PCC, and send mode is: the safety input that is adopted as the particular cell configuration sends handoff completion message to target evolution base station 703; The E-CGI that comprises current PCC sign or current PCC respective cell in this handoff completion message;
Target evolution base station 703 is used for, after receiving the handoff completion message that subscriber equipment 702 sends, according to the E-CGI of the current PCC in this handoff completion message sign or current PCC respective cell, with the SCC of the current PCC of indicating in the handoff completion message or E-CGI correspondence current PCC as self this subscriber equipment 702 of a side; Having under the situation about needing, when for example needing to reconfigure the parameter of current PCC of subscriber equipment 702, sending RRC connection reconfiguration message to subscriber equipment 702.
Support the while under situation about inserting on a plurality of CC at subscriber equipment 702,
Subscriber equipment 702 is used for, and sends handoff completion message to target evolution base station 703, and send mode is: the safety input that is adopted as the particular cell configuration sends handoff completion message to target evolution base station 703; The E-CGI that comprises current PCC sign or current PCC respective cell in this handoff completion message;
Target evolution base station 703 is used for, after receiving the handoff completion message that subscriber equipment 702 sends, according to the E-CGI of the current PCC in this handoff completion message sign or current PCC respective cell, with the SCC of the current PCC of indicating in the handoff completion message or E-CGI correspondence current PCC as self this subscriber equipment 702 of a side; Having under the situation about needing, when for example needing to reconfigure the parameter of current PCC of subscriber equipment 702, sending RRC connection reconfiguration message to subscriber equipment 702.
Further, subscriber equipment 702 is used for,
Self only supporting if can be used as the whole access failures of the SCC of standby PCC, then to change the Rel-8 handoff failure processing procedure in the LTE system under the situation about inserting from a CC;
Self supporting simultaneously under situation about inserting on a plurality of CC, if insert the current PCC failure, and the SCC that not can be used as standby PCC inserts successfully, then changes the Rel-8 handoff failure processing procedure in the LTE system over to.
This shows that the present invention has the following advantages:
(1) among the present invention, because source eNB is according to UE the measurement report of each CC to be obtained to the configuration information of current PCC and each SCC, the performance index that can reflect each CC more exactly, quality is fine, therefore, no matter be under the situation that UE only supports to insert from a CC, still support simultaneously under situation about inserting on a plurality of CC at UE, when UE inserts the current PCC failure, obtain can be used as the priority orders of the SCC of standby PCC according to the configuration information of SCC, UE can find the highest SCC of priority that can insert to finish access according to this priority orders, thereby the cut-in quality that guarantees the sub-district reaches best.And, because carrying out the sub-district, the configuration information to current PCC and each SCC that UE utilizes source eNB to send among the present invention switches, reduced direct employing Rel-8 handoff failure processing method required carry out carry out the step that Cell searching and system information read again, therefore, with respect to prior art, turn-on time of the present invention is shorter, and access procedure is also fairly simple.
(2) the present invention has made full use of the configuration information to current PCC and each SCC that UE sends to source eNB, and because these configuration information quality are fine, therefore, the present invention can accurately promptly find the best sub-district of cut-in quality, the randomness that this has effectively overcome when prior art is reselected sub-district to be accessed behind the handoff failure of sub-district has improved the quality that switch the sub-district.
(3) among the present invention, because UE can utilize the configuration information to each SCC behind handoff failure, whether each SCC that accurately forms a prompt judgement out can be used as standby PCC, and then find the best sub-district of cut-in quality, therefore, the present invention can effectively avoid problem in the prior art the problem includes: the sub-district of selecting at random behind the UE handoff failure to insert again the time may insert this problem that can not independently undertake the CC of data transfer task of expansion carrier wave.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a Long Term Evolution strengthens the changing method in the LTE-A system, it is characterized in that this method comprises:
User equipment (UE) is received the configuration information to current main member carrier PCC and each auxilliary member carrier SCC that the source evolution base station eNB sends, described configuration information comprises: the identification information of current PCC and each SCC, indicate each SCC whether to can be used as the information of standby PCC, and the information of the priority of each SCC;
Under the situation of only supporting to insert from a CC at UE, when UE received the switching command of source eNB transmission, UE preferentially attempted inserting current PCC; If the current PCC access failure, then UE judges according to the configuration information of described each SCC whether each SCC can be used as standby PCC, and obtains can be used as the priority orders of the SCC of standby PCC; UE attempts the highest SCC that can be used as standby PCC of access priority, if insert successfully, then that described priority is the highest SCC that can be used as standby PCC is as current PCC, if access failure, then UE attempts the access priority time high SCC that can be used as standby PCC, until inserting successfully, and with the SCC that can be used as standby PCC that inserted as current PCC; UE sends handoff completion message to target eNB;
Support the while under situation about inserting on a plurality of CC at UE, when UE received the switching command of source eNB transmission, UE inserted a plurality of CC that comprise described current PCC and all or part of SCC simultaneously according to the configuration information of described current PCC and each SCC; If UE inserts the current PCC failure, but comprise a SCC who can be used as standby PCC at least among the SCC that success inserts, then UE is according to the configuration information of described SCC, the SCC that can be used as standby PCC that the priority that finds UE successfully to insert is the highest, and with the SCC that found as current PCC; UE sends handoff completion message to target eNB.
2. method according to claim 1 is characterized in that, the configuration information that described UE receives is included in the switching command of source eNB transmission;
The information whether each SCC of described indication can be used as standby PCC is:
The cellular global identity E-CGI of the evolution of SCC respective cell only for the SCC that can be used as standby PCC, just comprises the E-CGI of this SCC in the configuration information;
Or,
The standby PCC indication information that 1bit is above is for the SCC that can be used as standby PCC with cannot be distinguished with different standby PCC indication informations respectively in configuration information as the SCC of standby PCC.
3. method according to claim 1 and 2 is characterized in that, described source eNB is before sending described switching command, and this method further comprises:
Described source eNB judges whether each SCC satisfies three criterions simultaneously, is then to indicate this SCC to can be used as standby PCC in configuration information, otherwise this SCC of indication cannot be as standby PCC in configuration information;
Described three criterions are: this SCC is backward compatibility carrier wave or non-backward compatible carrier waves; This SCC meets the standard that the sub-district is inserted; This SCC does not belong to the forbidding public land mobile communication network of UE;
Wherein, described source eNB judges to the measurement report of this SCC whether this SCC meets the sub-district and insert standard according to UE.
4. method according to claim 3, it is characterized in that, under the situation of only supporting to insert at UE from a CC, before source eNB sends described switching command, this method further comprises: described source eNB according to UE to the measurement report of each SCC and the load of each SCC, determine to can be used as the priority orders of each SCC of standby PCC, the method for determining is:
The measurement report of this SCC shows that the access standard that the cut-in quality of this SCC exceeds the sub-district is many more, and the priority of this SCC is high more;
Load on the SCC is more little, and the priority of this SCC is high more;
The information of the priority of described each SCC is: the precedence that information element IE occurs, and IE order occurs more by the SCC of elder generation in the described configuration information, and its priority is high more.
5. method according to claim 1 is characterized in that,
Under the situation of only supporting to insert from a CC at UE, UE sends handoff completion message to target eNB and is: UE sends handoff completion message to target eNB on current PCC; And/or the safety input that UE is adopted as the particular cell configuration sends handoff completion message to target eNB;
Support the while under situation about inserting on a plurality of CC at UE, described UE sends handoff completion message to target eNB and is: UE is adopted as the safety input of particular cell configuration to target eNB transmission handoff completion message.
6. method according to claim 1 is characterized in that,
Under the situation of only supporting to insert at UE, comprise the E-CGI of current PCC sign or current PCC respective cell in the described handoff completion message from a CC; After target eNB is received the described handoff completion message that UE sends, with the SCC of the current PCC of described handoff completion message indication or described E-CGI correspondence current PCC as self this UE of side;
When needs reconfigured the parameter of current PCC of UE, target eNB further sent radio resource control to UE and connects reconfiguration message;
Support the while under situation about inserting on a plurality of CC at UE, comprise the E-CGI of current PCC sign or current PCC respective cell in the described handoff completion message; After target eNB is received the described handoff completion message that UE sends, with the SCC of the current PCC of described handoff completion message indication or described E-CGI correspondence current PCC as self this UE of side;
When needs reconfigured the parameter of current PCC of UE, target eNB further sent radio resource control to UE and connects reconfiguration message.
7. the switched system in the LTE-A system is characterized in that this system comprises source evolution base station, subscriber equipment and target evolution base station, wherein,
The source evolution base station is used for to the configuration information of subscriber equipment transmission to current PCC and each SCC, and described configuration information comprises: the identification information of current PCC and each SCC, and indicate each SCC whether to can be used as the information of standby PCC, and the information of the priority of each SCC; Send switching command to subscriber equipment;
Subscriber equipment is used for the configuration information to SCC and current PCC that the reception sources evolution base station sends; Self only supporting that under the situation about inserting from a CC, when receiving the switching command that the source evolution base station sends, preferential trial inserts current PCC; If the current PCC access failure then according to the configuration information of described SCC, judges whether each SCC can be used as standby PCC, and obtain can be used as the priority orders of the SCC of standby PCC; Attempt the highest SCC that can be used as standby PCC of access priority; If insert successfully, then that described priority is the highest SCC that can be used as standby PCC is as current PCC, if access failure is then attempted the access priority time high SCC that can be used as standby PCC, until inserting successfully, and with the SCC that can be used as standby PCC that inserted as current PCC; Send handoff completion message to target evolution base station; Self supporting the while under situation about inserting on a plurality of CC, when receiving the switching command that the source evolution base station sends,, insert a plurality of CC that comprise described current PCC and all or part of SCC simultaneously according to described configuration information to SCC and current PCC; If insert the current PCC failure, but comprise a SCC who can be used as standby PCC at least among the SCC that success inserts, then according to the configuration information of described SCC, find the highest SCC that can be used as standby PCC of priority that successfully inserts, and with the SCC that found as current PCC; Send handoff completion message to target evolution base station;
Target evolution base station is used to receive the handoff completion message that subscriber equipment sends.
8. system according to claim 7 is characterized in that,
Described source evolution base station be used to judge whether each SCC satisfies three criterions simultaneously, is then to indicate this SCC to can be used as standby PCC in configuration information, otherwise this SCC of indication cannot be as standby PCC in configuration information;
Described three criterions are: this SCC is backward compatibility carrier wave or non-backward compatible carrier waves; This SCC meets the standard that the sub-district is inserted; This SCC does not belong to the forbidding public land mobile communication network of described subscriber equipment;
Wherein, described source evolution base station judges to the measurement report of this SCC whether this SCC meets the sub-district and insert standard according to described subscriber equipment.
9. system according to claim 8 is characterized in that,
Under the situation of only supporting to insert at subscriber equipment from a CC, before described source evolution base station sends described switching command, described evolution base station, be further used for according to subscriber equipment the measurement report of each SCC and the load of each SCC, determine to can be used as the priority orders of each SCC of standby PCC, determine that principle is:
The measurement report of this S CC shows that the access standard that the cut-in quality of this SCC exceeds the sub-district is many more, and the priority of this SCC is high more;
Load on the SCC is more little, and the priority of this SCC is high more;
The information of the priority of described each SCC is: the precedence that IE occurs, and IE order occurs more by the SCC of elder generation in the described configuration information, and its priority is high more.
10. system according to claim 7 is characterized in that,
Under the situation of only supporting to insert from a CC at subscriber equipment, described subscriber equipment comprises the E-CGI of current PCC sign or current PCC respective cell in the handoff completion message that target evolution base station sends;
Described target evolution base station is used for, after receiving the handoff completion message that subscriber equipment sends, with the SCC of current PCC in the described handoff completion message or the described E-CGI correspondence current PCC as self this subscriber equipment of side; When needs reconfigure the parameter of current PCC of subscriber equipment, further send radio resource control and connect reconfiguration message to subscriber equipment;
Simultaneously under situation about inserting on a plurality of CC, described subscriber equipment comprises the E-CGI of current PCC sign or current PCC respective cell in the handoff completion message that target evolution base station sends in the subscriber equipment support;
Described target evolution base station is used for, after receiving the handoff completion message that subscriber equipment sends, with the current PCC in the described handoff completion message or the pairing SCC of the described E-CGI current PCC as self this subscriber equipment of side; When needs reconfigure the parameter of current PCC of subscriber equipment, further send radio resource control and connect reconfiguration message to subscriber equipment.
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