CN102905333A - Handover method for LTE (long term evolution) mobile communication system and corresponding eNB node - Google Patents
Handover method for LTE (long term evolution) mobile communication system and corresponding eNB node Download PDFInfo
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Abstract
The invention provides a handover method for an LTE (long term evolution) mobile communication system and a corresponding eNB node. The method comprises the following steps of: configuring measurement requests which are relevant to parameter setting of a measurement report for triggering handover preparation and of a measurement report for triggering the handover for UE (user equipment); receiving a measurement report which is from the UE and is used for triggering the handover preparation; judging for handing over according to the received measurement report for triggering the handover preparation; acquiring radio resource control connection reconfiguration information related to handover; storing the radio resource control connection reconfiguration information; receiving a measurement report which is from the UE and is used for triggering the handover; providing the stored radio resource control connection reconfiguration information to the UE to start the handover; and releasing the related resource after successful handover is carried out.
Description
Technical field
The present invention relates to 3GPP Long-Term Evolution (Long Term Evolution is called for short LTE) mobile communication system, particularly, relate to the handoff technique in the LTE mobile communication system.
Background technology
The LTE technology is the evolution of 3G (Third Generation) Moblie technology 3G, is the transition between 3G technology and the 4G technology.
Fig. 1 shows the schematic diagram of the general framework of LTE mobile communication system.As shown in Figure 1, the LTE communications network system adopts two-layer flat network architectures usually, comprise by the Access Network E-UTRAN of eNodeB (being designated hereinafter simply as eNB) node formation and by Mobility Management Entity (Mobility Management Entity, referred to as MME) and gateway (Serving Gateway, referred to as SGW) Evolved Packet Core (Evolved Packet Core network is referred to as the EPC) node that consists of.Access Network E-UTRAN is provided to user's face and the chain of command agreement of subscriber equipment (User Equipment is referred to as UE).Undertaken alternately by X2 interface between the eNB node, the eNB node is connected with the EPC node by the S1 interface.Although only show for convenience of explanation an EPC node in Fig. 1, in fact the LTE mobile communication system can comprise a plurality of EPC nodes, each EPC node is connected with a plurality of eNB nodes.
Switching in the LTE mobile communication system is according to the homing position relation of the Target cell that switches and cell-of-origin, can be divided between the interior switching of connecting system and connecting system and switch, wherein, switch in the connecting system comprise that (intra-eNB) switches in the eNB node, between the eNB node (inter-eNB) switch and MME between switch.In addition, according to the frequency relation of Target cell and cell-of-origin, switching can be divided into (intra-frequency) switching and alien frequencies (inter-frequency) switch frequently.
Usually, the handoff procedure in the LTE mobile communication system comprises following three phases: handover measurement, switch decision and switching are carried out.For the situation that intra-eNB switches, in the handover measurement stage, user equipment (UE) is independently measured according to the measurement configuration of cell-of-origin, and after satisfying report condition, user equipment (UE) is to the cell-of-origin reporting measurement reports.In the switch decision stage, whether needs switch to Target cell the measurement report judgement user equipment (UE) that the cell-of-origin reports according to user equipment (UE).In handover execution stage, the cell-of-origin sends switching command according to the preparation of Target cell to user equipment (UE), so that user equipment (UE) switches to Target cell.For the situation of switching between inter-eNB switching or MME, then above-mentioned handover measurement, switch decision and handover execution stage need the common cooperation of user equipment (UE), source eNB node, target eNB node and EPC node to finish.
The below describes for several situations of switching between the eNB node.
Switch with frequency between situation 1:eNB node
Fig. 2 schematically shows the process of switching between the eNB node based on X2 interface in the existing connecting system, and it can be divided into, and switching is prepared, switching is carried out and three steps are finished in switching, and these three steps are included in above-mentioned handover execution stage.
Before switching preparation process, source eNB node is by the measurement of Measurement Control (measuring control) message arrangement user equipment (UE).Measuring control message is the measurement requirement that source eNB node is issued user equipment (UE), can comprise information such as measuring sign, measuring command, measurement type, measuring object, measuring amount, report amount, measurement report criterion, measurement clearance.Wherein, measuring type can be common frequency measurement, different-frequency measure etc.Measuring amount is such as being Reference Signal Received Power RSRP, Reference Signal Received Quality RSRQ etc.The measurement report criterion refers to the triggering criterion of measurement report, and for example the cycle triggers or Event triggered.So-called Event triggered refers to when satisfying the condition of event, sends measurement report.In with the frequency handoff procedure, to measure type and be configured to common frequency measurement, the measurement report criterion is configured to for example A3 event, and namely the neighbor cell quality is better than the Serving cell quality, and difference surpasses appointed threshold.User equipment (UE) according to the content of measuring control message, is measured after receiving the measurement control message, and when satisfying the measurement report criterion, sends measurement report message to source eNB node.At this moment, measurement report is the A3 event of switching for triggering.
After source eNB node received measurement report message, according to the content of measurement report message, the criterion of switching was satisfied in judgement, and therefore judgement is switched.Simultaneously, source eNB node is determined the target eNB node also according to the target cell information in the measurement report message.
In switching preparation process, source eNB node sends handover request (Handover Request) message to the target eNB node, the target eNB node is carried out access control, be the user equipment (UE) Resources allocation, and return Handover Request Acknowledge (Handover Request ACK) message to source eNB node, in this switching request acknowledgement message, comprise " RRC Connection Reconfiguration (wireless resource control connection reconfiguration) ".
Then, in switching execution in step, source eNB node is after receiving switching request acknowledgement message, " the RRC Connection Reconfiguration " that comprise in the switching request acknowledgement message that receives sent to user equipment (UE) as switching command message, and the order user equipment (UE) switches.In addition, source eNB node is also to target eNB node forward downlink packet, and the transmission state information.The target eNB node begins the packet that buffer memory is forwarded.Then, user equipment (UE) is synchronized to the target eNB node according to the new configuration that receives.The target eNB node provides downlink allocation and time advance information to user equipment (UE).User equipment (UE) sends " RRC Connection Reconfiguration Complete (the RRC connection is reshuffled and finished) " message again to the target eNB node, to confirm switching.
At last, in switching completing steps, the target eNB node sends Path Switch Request (path handover request) message to Mobility Management Entity MME, carries out the upper strata link switching with request.Then, Mobility Management Entity MME sends User Plane Update Request (user plane update request) message to gateway SGW, gateway SGW conversion downlink data path is to the target eNB node, and transmission User Plane Update Response (user plane upgrades response) message is to Mobility Management Entity MME.Mobility Management Entity is replied Path Switch Request ACK (path Handover Request Acknowledge) message to the target eNB node.At this moment, target eNB node notification source eNB node discharges related resource, and namely user equipment (UE) is in the resource of source eNB Nodes.
In above-mentioned same frequency handoff procedure, switching delay can carry out access control and target eNB node to target eNB node request switching, target eNB node at source eNB node and return in three steps of Handover Request Acknowledge and produce about several milliseconds.Owing to there is long switching delay, therefore, can increase the cutting off rate during the handover operation.
Alien frequencies switches between situation 2:eNB node, carries out different-frequency measure but user equipment (UE) need not measurement clearance (Measurement GAP is called for short MG)
So-called alien frequencies switching refers to the switching that Target cell is different from the operating frequency of cell-of-origin.When user equipment (UE) had many antennas, when namely user equipment (UE) can be operated under a plurality of frequencies, when carrying out the alien frequencies switching, subscriber equipment need not measurement clearance and carries out different-frequency measure.In this case, between the eNB node between the eNB node of alien frequencies handoff procedure and situation 1 with handoff procedure is identical frequently.
Alien frequencies switches between situation 3:eNB node, but user equipment (UE) needs measurement clearance to carry out different-frequency measure
If user equipment (UE) only has individual antenna, namely user equipment (UE) can only be operated under the single frequency, and then when carrying out the alien frequencies switching, user equipment (UE) needs measurement clearance to carry out different-frequency measure.At this moment, eNB node in source need to and activate measurement clearance for the user equipment (UE) configuration.
Fig. 3 schematically shows the existing interior process of switching based on alien frequencies between the eNB node of X2 interface of connecting system that needs measurement clearance.
As shown in Figure 3, source eNB node comprises the configuration of common frequency measurement, different-frequency measure, relevant A2 event (can be expressed as Event_A2_MG) for activating measurement clearance, the configuration of relevant A3 event (can be expressed as Event_A3) for triggering switching etc. in the measurement control message when the measurement of configure user equipment UE.The A2 event refers to that the Serving cell quality is lower than the absolute thresholding of appointment.By the absolute thresholding in the configuration A2 event and the appointed threshold in the A3 event, can be used in the A2 event that activates measurement clearance and be sent out prior to being used for triggering the A3 event of switching.
Then, user equipment (UE) is measured according to measuring control message, when satisfying the A2 event, sends measurement report to source eNB node: the A2 event that is used for activating measurement clearance.Source eNB node activates measurement clearance according to measurement report, and reshuffles (RRC ReConfig) message to the control of user equipment (UE) transmission Radio Resource.In this message, notifying user equipment UE measurement clearance is activated, adds about the configuration of the A1 event that is used for the deexcitation measurement clearance and removes for the A2 event that activates measurement clearance.
When the A3 event was satisfied in the measurement of carrying out when user equipment (UE), it sent measurement report to source eNB node: be used for triggering the A3 event of switching.Then, source eNB node determination target eNB node, and jointly cooperate with target eNB node, user equipment (UE), Mobility Management Entity MME and to carry out alien frequencies switching between the eNB node.With handoff procedure is identical frequently, repeat no more between the eNB node in concrete handoff procedure and the situation 1 herein.
In this alien frequencies handoff procedure, need measurement clearance carrying out different-frequency measure, and during measurement clearance, user equipment (UE) can not be scheduled, thereby cause the throughput of system to reduce.
For switching in the eNB node, also exist in the eNB node with the alien frequencies that frequently switches, need not in the eNB node measurement clearance switch and the eNB node in need the alien frequencies of measurement clearance to switch three kinds of situations, the concrete handoff procedure of these three kinds of situations is known for those of ordinary skill in the art.
Be applied in the LTE mobile communication system in the situation of high ferro train, can adopt at whole high ferro train deploy train broadband access system (Train Broadband Access System, be called for short TBAS) and this TBAS in all terminal equipments via the formation of train broadband access unit (Train Broadband Access Unit is called for short TBAU) access LTE mobile communication system.In this formation, access unit TBAU can be considered to the subscriber equipment of LTE mobile communication system.If the handoff failure of access unit TBAU, then all terminal equipments among the TBAS all will go offline, and therefore, the success rate of switching is very important for access unit TBAU.In addition, because all terminal equipments among the TBAS are all accessed the LTE mobile communication system via access unit TBAU, therefore, the throughput of access unit TBAU also is very important for the service quality of guaranteeing terminal equipment (QoS).
Yet, in the technical scheme of between existing eNB node, switching, exist switching delay to grow, sometimes need the situation of measurement clearance, this all may cause access unit TBAU to switch unsuccessful or throughput descends.
Summary of the invention
The present invention proposes in view of above-mentioned technical problem just, its purpose is to provide a kind of changing method for the LET mobile communication system and corresponding node, it can reduce switching delay, and control is switched and avoided measurement clearance exactly, thereby strengthens the performance of switching between the eNB node.
According to an aspect of the present invention, a kind of changing method for the LTE mobile communication system is provided, comprises: comprise and the measurement report be used for to trigger switch prepared and be used for triggering the measurement requirement that the relevant parameter of the measurement report that switches arranges to user device configuration; Reception is from the measurement report that is used for triggering the switching preparation of described subscriber equipment; Described for triggering the measurement report that switches preparation according to what receive, judgement is switched; Obtain and comprise and the Handover Request Acknowledge that switches relevant wireless resource control connection reconfiguration information; Store described wireless resource control connection reconfiguration information; Reception is from the measurement report that is used for triggering switching of described subscriber equipment; Sending the switching command that comprises the wireless resource control connection reconfiguration information of storing to described subscriber equipment switches to start; And behind handover success, discharge related resource.
According to another aspect of the present invention, a kind of node that uses in the LTE mobile communication system is provided, comprise: measure and require configuration module, for comprising to user device configuration and switching the measurement report of preparing and the measurement requirement that arranges for the relevant parameter of the measurement report of triggering switching for triggering; Receiver module, the measurement report of preparing is switched in the triggering that is used for that is used for receiving from described subscriber equipment, and receives the measurement report that triggering is switched that is used for from described subscriber equipment; The switch decision module is used for according to the described measurement report for triggering the switching preparation that receives, and judgement is switched; Acquisition module is used for obtaining the Handover Request Acknowledge that comprises the wireless resource control connection reconfiguration information relevant with switching; Memory module is used for storing described wireless resource control connection reconfiguration information; Sending module is used for sending the switching command that comprises the wireless resource control connection reconfiguration information of storing to described subscriber equipment and switches to start; And the resource release module, be used for behind handover success, discharging related resource.
Description of drawings
Fig. 1 is the schematic diagram of the general framework of LTE mobile communication system;
Fig. 2 is the schematic diagram of the process switched between the eNB node based on X2 interface in the existing connecting system;
Fig. 3 is the existing interior schematic diagram based on the process of alien frequencies switching between the eNB node of X2 interface of connecting system that needs measurement clearance;
Fig. 4 is the flow chart of the changing method for the LTE mobile communication system according to an embodiment of the invention;
Fig. 5 is the indicative flowchart of the obtaining step in the changing method embodiment illustrated in fig. 4;
Fig. 6 is the schematic diagram of an example that can use the LTE mobile communication system of changing method embodiment illustrated in fig. 4;
Fig. 7 is the schematic block diagram of the eNB node that uses in the LTE mobile communication system according to an embodiment of the invention.
Embodiment
Believe that by below in conjunction with the detailed description of accompanying drawing to specific embodiments of the invention, above and other objects of the present invention, feature and advantage will be more readily apparent from.
Fig. 4 shows the flow chart of the changing method for the LTE mobile communication system according to an embodiment of the invention.Below in conjunction with accompanying drawing, present embodiment is described in detail.
In the present embodiment, the LTE mobile communication system adopts framework shown in Figure 1.The changing method of present embodiment is carried out at source eNB Nodes, and source eNB node refers to the eNB node of current service subscriber equipment.
As shown in Figure 4, in step S401, source eNB node is to the requirement of user equipment (UE) allocating and measuring, and this measurement requires to comprise with the measurement report that is used for triggering switching preparation and be used for triggering the relevant parameter setting of measurement report of switching.
Comprise that being provided for triggering the measurement report that switches preparation is the A2 Event triggered in the present embodiment, with for the relevant parameter setting of the measurement report that triggers the switching preparation, the first thresholding of A2 event etc. is set.The parameter setting relevant with the measurement report that is used for the triggering switching comprises that being provided for triggering the measurement report that switches preparation is A2 event or A3 Event triggered, the second thresholding of A2 event or the thresholding of A3 event etc. is set.The thresholding of the first thresholding, the second thresholding and A3 event by the A2 event is set can switch the measurement report of preparing and send first than being used for triggering the measurement report that switches so that be used for triggering.
For switching with the internodal alien frequencies that need not measurement clearance of eNB in the above-mentioned eNB node and in eNB internodal together frequency switching and the eNB node, be used for triggering and switch (can be expressed as " Event_A2_Prepare ") that the measurement report of preparing is set to be the A2 Event triggered, be used for triggering (can be expressed as " Event_A3_HO ") that the measurement report that switches is set to be the A3 Event triggered.For switching with the internodal alien frequencies of measurement clearance that needs of eNB in the above-mentioned eNB node, be used for triggering the measurement report that switches preparation and be used for triggering (can be expressed as respectively " Event_A2_Prepare " and " Event_A2_HO ") that the measurement report that switches all is set to be the A2 Event triggered.
Then, at step S405, source eNB node receives the measurement report that is used for triggering the switching preparation from user equipment (UE).User equipment (UE) requires to measure according to measuring after receiving measurement that source eNB node disposes and requiring.When the A2 event with first thresholding was satisfied, user equipment (UE) sent to be used for triggering to source eNB node and switches the measurement report of preparing, and switches set-up procedure to trigger.
At step S410, source eNB node is according to the measurement report that is used for triggering the switching preparation that receives, and judgement is switched.Particularly, source eNB node judges that according to the content of this measurement report it satisfies switching criterion, thereby judgement is switched.Simultaneously, eNB node in source will be determined the Target cell that user equipment (UE) will switch to.
At step S415, source eNB node obtains and switches relevant wireless resource control connection reconfiguration information.Referring to Fig. 5, at step S4151, according to target cell information, source eNB node judges that this switching is to switch between the interior switching of eNB node or eNB node.Usually, if Target cell belongs to source eNB node, show that then this switching is to switch in the eNB node.If Target cell belongs to another eNB node, show that then this switching is to switch between the eNB node, and the eNB node under the Target cell becomes the target eNB node.If it is to switch in the eNB node that source eNB node is judged this switching, then at step S4152, source eNB node carries out the access control of Target cell, and is the user equipment (UE) Resources allocation, determines corresponding wireless resource control connection reconfiguration information.If it is to switch between the eNB node that source eNB node is judged this switching, then at step S4153, source eNB node switches to the request of target eNB node, and at step S4154, receives the wireless resource control connection reconfiguration information relevant with switching from this target eNB node.In the present embodiment, after source eNB node sends handover request message to the target eNB node, the target eNB node carries out the access control of Target cell, be the user equipment (UE) Resources allocation, make up corresponding wireless resource control connection reconfiguration information, and it is included in returns to source eNB node in the Handover Request Acknowledge.
Then, at step S420, the wireless resource control connection reconfiguration information that eNB node storage in source is obtained, and directly do not send to user equipment (UE).
During the step 420, user equipment (UE) is proceeded to measure at above-mentioned steps S410.When the A3 event with thresholding was satisfied, perhaps when the A2 event with second thresholding was satisfied, user equipment (UE) sent to source eNB node and is used for triggering the measurement report that switches.
At step S425, source eNB node receives the measurement report that is used for triggering switching from user equipment (UE), and then, at step S430, source eNB node provides the wireless resource control connection reconfiguration information of storing to switch to start to user equipment (UE) immediately.This step can be sent realization to subscriber equipment by this wireless resource control connection reconfiguration information is included in the switching command.Then, when switching in switching is the eNB node, under the control of source eNB node, user equipment (UE) switches to the Target cell that belongs to same eNB node.When switching is when switching between the eNB node, under the common cooperation of user equipment (UE), source eNB node, target eNB node, Mobility Management Entity MME and gateway SGW, user equipment (UE) switches to the Target cell of target eNB node from source eNB node.Behind handover success, the target eNB node sends resource release message to source eNB node.At last, at step S435, the shared related resource of source eNB node releasing user equipment UE.
Can find out by above description, in the changing method of present embodiment, switch the measurement report of preparing and be used for triggering the measurement report that switches by using to be used for triggering, can be so that wireless resource control connection reconfiguration information be stored in source eNB node before the measurement report that is used for the triggering switching is triggered, therefore, obtaining the required time of wireless resource control connection reconfiguration information is not comprised in the switching delay, thereby can greatly reduce switching delay.Further, wireless resource control connection reconfiguration information can receive after triggering the measurement report that switches at source eNB node and offer immediately user equipment (UE), therefore, can control exactly switching.In addition, owing to for switching with the internodal alien frequencies of measurement clearance that needs of eNB in the eNB node, use two A2 events to replace the A3 events that need measurement clearance of the prior art, therefore, the changing method of present embodiment need not measurement clearance, thereby can not affect the throughput of system.In addition, adopt the changing method of present embodiment can also carry out at an easy rate the network optimization.
Fig. 6 is the schematic diagram of an example that to use the LTE mobile communication system of changing method embodiment illustrated in fig. 4.Although only show in the drawings an EPC node, be not limited to this, the LTE mobile communication system can comprise a plurality of EPC nodes.As shown in Figure 6, this LTE mobile communication system (is illustrated as LTE-HBS, LTE high-speed backbone system) be connected with the TBAS system via access unit TBAU, the various terminal equipments in the TBAS system are all by access unit TBAU access LTE mobile communication system like this.In this case, access unit TBAU can be counted as the user equipment (UE) of LTE mobile communication system.Along with travelling of train, access unit TBAU (belongs to source eNB node) from the cell-of-origin and switches to Target cell (belonging to same eNB node (being source eNB node) or another eNB node (being the target eNB node)).
Particularly, source eNB node according to the content of this measurement report, determines to satisfy switching criterion behind the measurement report that is used for triggering switching preparation that receives from access unit TBAU, and definite Target cell.When determining Target cell, although in this measurement report, do not comprise the information of neighbor cell, because therefore the unidirectional of train driving, is easy to the travel direction according to train, determine Target cell.In addition, if there are a plurality of overlapping covered Target cells that have, then can set up in advance the neighbouring relations between the residential quarter of all eNB nodes, be that neighbor cell, residential quarter 2 and the residential quarter 4 of residential quarter 2 is neighbor cells of residential quarter 3 etc. such as residential quarter 1 and residential quarter 3.Then, according to these neighbouring relations and in conjunction with the travel direction of train, source eNB node can easily be determined Target cell.
Under same inventive concept, Fig. 7 shows the schematic block diagram of the eNB node that uses according to an embodiment of the invention in the LTE mobile communication system.For for simplicity, eNB node shown in Figure 7 only shows and switches relevant module, and those of ordinary skill in the art should be appreciated that the eNB node also comprises other module.Below in conjunction with accompanying drawing, the eNB node of present embodiment is described in detail, wherein, for the part identical with front embodiment, suitably the description thereof will be omitted.
As shown in Figure 7, the eNB node 700 of present embodiment comprises: measure and to require configuration module 701, it comprises and is used for triggering and switches the measurement report of preparing and be used for triggering the measurement requirement that the relevant parameter of the measurement report that switches arranges to the user equipment (UE) configuration; Receiver module 702, it receives the measurement report that is used for triggering the switching preparation from user equipment (UE), and receives the measurement report that is used for triggering switching from user equipment (UE); Switch decision module 703 is used for according to the measurement report that is used for triggering the switching preparation that receives, and judgement is switched; Acquisition module 704 is used for obtaining and switching relevant wireless resource control connection reconfiguration information; Memory module 705 is used for the wireless resource control connection reconfiguration information that storage is obtained; Module 706 is provided, is used for providing the wireless resource control connection reconfiguration information of storing to switch to start to user equipment (UE); And resource release module 707, be used for behind handover success, discharging related resource.
As previously mentioned, in the measurement that measurement requires configuration module 701 to dispose requires, the parameter setting relevant with the measurement report of be used for to trigger switch preparing comprise and be provided for triggering that to switch the measurement report of preparing be the A2 Event triggered, the first thresholding of A2 event etc. is set, and the parameter setting relevant with being used for triggering the measurement report that switches comprises it being to be provided for triggering that to switch the measurement report of preparing be A2 event or A3 Event triggered, the second thresholding of A2 event or the thresholding of A3 event etc. are set.In addition, for switching with the internodal alien frequencies that need not measurement clearance of eNB in the eNB node and in eNB internodal together frequency switching and the eNB node, it is the A2 Event triggered that measurement requires configuration module 701 to be set to for the measurement report that triggers the switching preparation, and being set to for the measurement report that triggers switching is the A3 Event triggered.For in the eNB node and the internodal alien frequencies that needs measurement clearance of eNB switch, measuring that the measurement report that requires configuration module 701 will be used for triggering to switch the measurement report of preparing and be used for triggering switching all is set to be the A2 Event triggered.
Measure after the measurement that requires the configuration module 701 to dispose requires when user equipment (UE) has received, according to measuring the content that requires, measure.After having satisfied the A2 event with first thresholding, user equipment (UE) sends the measurement report that is used for triggering the switching preparation to the eNB node 700 of present embodiment.Receiver module 702 receptions are switched the measurement report of preparing from user equipment (UE) for triggering, and switch the measurement report prepared according to what receive for triggering by switch decision module 703, and judgement is switched.In switch decision module 703, switch determining unit 7031 according to being used for triggering the measurement report that switching is prepared, determine to satisfy switching criterion, thereby the Target cell that while Target cell determining unit 7032 definite user equipment (UE)s will switch to is switched in judgement.When user equipment (UE) was access unit TBAU in the TBAS system, Target cell determining unit 7032 was determined Target cell according to the travel direction of train.
After 703 judgements of switch decision module were switched, acquisition module 704 obtained and switches relevant wireless resource control connection reconfiguration information.Particularly, in acquisition module 704, at first judging unit 7041 judges that according to the information of the Target cell that obtains this switching is to switch between the interior switching of eNB node or eNB node in the switch decision module.As previously mentioned, judging unit 7041 can according to Target cell whether belong to this eNB node judge in the eNB node switch or the eNB node between switch.If Target cell belongs to this eNB node, then this switching is to switch in the eNB node.If Target cell belongs to another eNB node that is not this eNB node, then this switching is to switch between the eNB node, and the eNB node under the Target cell is the target eNB node.Then, when switching in switching is the eNB node, determining unit 7042 is determined corresponding wireless resource control connection reconfiguration information by the access control of Target cell.When switching is when switching between the eNB node, handover request unit 7043 switches to the request of target eNB node, the target eNB node is after receiving handover request, carry out the access control of Target cell, and make up corresponding wireless resource control connection reconfiguration information, then this wireless resource control connection reconfiguration information is included in the Handover Request Acknowledge and returns, received by receiver module 702.Then, memory module 705 is stored the wireless resource control connection reconfiguration information that acquisition modules 704 obtain.
When receiver module 702 received the measurement report that be used for to trigger switches from user equipment (UE), the wireless resource control connection reconfiguration information that provides module 706 to provide to user equipment (UE) to store was switched to start.Usually, wireless resource control connection reconfiguration information is included in sends to user equipment (UE) in the switching command.Behind handover success, the shared related resource of resource release module 707 releasing user equipment UE.
The eNB node 700 that should be pointed out that present embodiment can be realized the changing method of Fig. 4 and embodiment shown in Figure 5 in operation.
Should be understood that, the eNB node of above-described embodiment and part thereof can be by such as very lagre scale integrated circuit (VLSIC) or gate array, realize such as the semiconductor of logic chip, transistor etc. or such as the hardware circuit of the programmable hardware device of field programmable gate array, programmable logic device etc., also can use the software of being carried out by various types of processors to realize, also can be realized by the combination of above-mentioned hardware circuit and software.
Although more than describe the changing method for the LTE mobile communication system of the present invention and corresponding eNB node in detail by exemplary embodiment, but above these embodiment are not exhaustive, and those skilled in the art can realize variations and modifications within the spirit and scope of the present invention.Therefore, the present invention is not limited to these embodiment, and scope of the present invention is only defined by the appended claims.
Claims (11)
1. changing method that is used for the Long-Term Evolution mobile communication system comprises:
Comprise and the measurement report be used for to trigger switch prepared and be used for triggering the measurement requirement that the relevant parameter of the measurement report that switches arranges to user device configuration;
Reception is from the measurement report that is used for triggering the switching preparation of described subscriber equipment;
Described for triggering the measurement report that switches preparation according to what receive, judgement is switched;
Obtain and switch relevant wireless resource control connection reconfiguration information;
Store described wireless resource control connection reconfiguration information;
Reception is from the measurement report that is used for triggering switching of described subscriber equipment;
Provide the wireless resource control connection reconfiguration information of storing to switch to start to described subscriber equipment; And
Behind handover success, discharge related resource.
2. changing method according to claim 1, wherein, described obtaining with the step of switching relevant wireless resource control connection reconfiguration information comprises:
According to target cell information, judge that described switching is to switch between the interior switching of eNB node or eNB node;
If switch in the eNB node, then determine described wireless resource control connection reconfiguration information;
If switch between the eNB node, then switch to the request of target eNB node, and receive described wireless resource control connection reconfiguration information from described target eNB node.
3. changing method according to claim 1 and 2, wherein, for the alien frequencies switching that need not measurement clearance between the alien frequencies switching that need not measurement clearance in the same frequency switching in the eNB node, the switching of the internodal together frequency of eNB, the eNB node and eNB node, described measurement report for trigger to switch preparing is set to be the A2 Event triggered, describedly is set to be the A3 Event triggered for triggering the measurement report that switches.
4. changing method according to claim 1 and 2, wherein, for the alien frequencies that needs measurement clearance in the eNB node switch and the eNB node between need the alien frequencies of measurement clearance to switch, describedly switch the measurement report prepared and describedly all be set to be the A2 Event triggered for triggering the measurement report that switches for triggering.
5. according to claim 1 to the described changing method of 4 any one, wherein, described subscriber equipment is the train broadband access unit in the train broadband access system.
6. changing method according to claim 5, wherein, describedly describedly switch the step that the measurement report judgement of preparing switches and comprise for triggering according to what receive:
Switch the measurement report of preparing according to described for triggering, determine to satisfy switching criterion; And
According to the travel direction of train, determine the Target cell that described subscriber equipment will switch to.
7. eNB node that uses in the Long-Term Evolution mobile communication system comprises:
Measurement requires configuration module, for comprising to user device configuration and switching the measurement report of preparing and the measurement requirement that arranges for the relevant parameter of the measurement report of triggering switching for triggering;
Receiver module, the measurement report of preparing is switched in the triggering that is used for that is used for receiving from described subscriber equipment, and receives the measurement report that triggering is switched that is used for from described subscriber equipment;
The switch decision module is used for according to the described measurement report for triggering the switching preparation that receives, and judgement is switched;
Acquisition module is used for obtaining and switching relevant wireless resource control connection reconfiguration information;
Memory module is used for storing described wireless resource control connection reconfiguration information;
Module is provided, is used for providing the wireless resource control connection reconfiguration information of storing to switch to start to described subscriber equipment; And
The resource release module is used for discharging related resource behind handover success.
8. eNB node according to claim 6, wherein, described acquisition module comprises:
Judging unit is used for according to target cell information, judges that described switching is to switch between the interior switching of eNB node or eNB node;
Determining unit when being used for switching, is determined described wireless resource control connection reconfiguration information in described switching is the eNB node;
The handover request unit, being used in described switching is when switching between the eNB node, switches to the request of target eNB node;
Wherein, described receiver module also is used for receiving described wireless resource control connection reconfiguration information from described target eNB node.
9. according to claim 7 or 8 described eNB nodes, wherein, for the alien frequencies switching that need not measurement clearance between the alien frequencies switching that need not measurement clearance in the same frequency switching in the eNB node, the switching of the internodal together frequency of eNB, the eNB node and eNB node, it is the A2 Event triggered that described measurement requires configuration module to be used for that described measurement report for trigger to switch preparing is set to, and described is the A3 Event triggered for triggering that the measurement report that switches is set to.
10. according to claim 7 or 8 described eNB nodes, wherein, switch and the internodal alien frequencies of measurement clearance that needs of eNB switches for the alien frequencies that needs measurement clearance in the eNB node, described measurement requires configuration module to be used for described that to switch that the measurement report prepared and described measurement report for triggering switching all be set to be the A2 Event triggered for triggering.
11. according to claim 7 to the described eNB node of 10 any one, wherein, described subscriber equipment is the train broadband access unit in the train broadband access system;
Described switch decision module comprises:
Switch determining unit, be used for switching the measurement report of preparing according to described for triggering, determine to satisfy switching criterion; And
The Target cell determining unit is used for the travel direction according to train, determines the Target cell that described subscriber equipment will switch to.
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