CN104754639A - Method and base station for reducing handover delay in train broadband access system - Google Patents
Method and base station for reducing handover delay in train broadband access system Download PDFInfo
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- CN104754639A CN104754639A CN201310753141.6A CN201310753141A CN104754639A CN 104754639 A CN104754639 A CN 104754639A CN 201310753141 A CN201310753141 A CN 201310753141A CN 104754639 A CN104754639 A CN 104754639A
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- 238000005259 measurement Methods 0.000 claims abstract description 170
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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Abstract
The invention aims at providing a method and a base station for reducing handover delay in the source base station (eNB) of a train broadband access system. The method comprises the following steps of transmitting measurement control information to user equipment; receiving a first measurement report from the user equipment, which is generated on the basis of the measurement control information; after the first measurement report is received, determining a target object that the user equipment can be switched to; transmitting connection reconfiguration information, which corresponds to the target object for handover, to the user equipment; receiving a second measurement report which is generated by the user equipment on the basis of the measurement control information. The method for reducing the handover delay of the train broadband access system reduce the time duration of handover delay and accurately control the trigger point for executing handover; for the situations requiring measuring clearance, the method for reducing handover delay in the train broadband access system can save a process of activating the measuring clearance for different-frequency measurement, thereby avoiding influence of the measuring clearance on throughput.
Description
Technical field
The present invention relates to communication technical field, particularly relate to the method and base station that reduce switching delay in a kind of base station at train broadband access system (eNB).
Background technology
LTE mobile communication system is applied in bullet train by Long-Term Evolution high-speed backbone system (LTE High-speed Backhaul System, LTEHBS).Fig. 1 shows the Organization Chart of bullet train communication system.Wherein, described Long-Term Evolution high-speed backbone system comprises one or more base stations high-speed backbone (eNB High-speed Backhaul, eNB-HB), and by Mobility Management Entity (Mobility Management Entity, and gateway (Serving Gateway MME), SGW) Evolved Packet Core (Evolved PacketCorenetwork, EPC) formed.Wherein, train broadband access system (TrainBroadband Access System is deployed in train, TBAS), described train broadband access system comprises one or more base station be deployed in train, one or more subscriber equipment (User Equipment, UE), all terminal equipments in TBAS, as mobile phone, PDA etc. are first connected to one or more base station be deployed in train, be connected to by train broadband access unit (TrainBroadband Access Unit, TBAU) and be connected to network by TBAU.Wherein, TBAU and eNB-HBS carries out transfer of data and performs switching.If the handoff failure of TBAU, then all in TBAS terminal equipments all will go offline.Further, because all terminal equipments in TBAS are all connected to network via access unit TBAU, therefore, the throughput in TBAU is very important for the service quality (QoS) guaranteeing terminal equipment.
The handoff procedure of LTE system Plays mainly comprises handover measurement, switch decision and switching and performs three processes.For the switching of community between base station or in base station, A3 event is usually used to trigger switching.Six kinds of situations are below divided to carry out handoff procedure common in brief description LTE system.
Situation one: the switching between base station, frequency
The flow chart of between Fig. 2 shows based on the base station of X2 interface, in frequency handoff procedure.
With reference to Fig. 2, subscriber equipment (User Equipment, UE) switches to target BS from source base station.
In step P1, source base station sends measuring control information (MeasurementControl) to UE and carrys out the measuring process of configuration UE for communication quality, wherein, described measuring control information comprises the measurement requirement of the measurement report that source base station generates for UE needs, such as, measure the information such as mark (Measurement Identity), measuring command (Measurement Command), measuring object (Measurement Object) and measurement report criterion (Measurement reporting criteria).
Then, in step P2, UE sends measurement report to source base station, and wherein, this measurement report generates based on A3 event usually.
Then, in step P3, source base station carries out switching judging according to measurement report.
Then, in step P4, source base station judges to meet switching condition, sends handover request (Handover Request) to target BS.
Then, in step P5, target BS carries out access control.
Then, in step P6, after access success, target BS prepares related resource and sends switching request acknowledgement message (Handover Request ACK) to source base station.
Then, in step P7, source base station sends the wireless resource control connection reconfiguration message (RRC ConnectionReconfiguration) comprised in switching request acknowledgement message to UE, carry out order UE and switch.
Then, in step P8, source base station sends state information to target BS.
Then, in step P9, depart from source base station and be synchronized to target BS.
Then, in step P10, target BS sends downlink allocation information and time advance information to UE.
Then, in step P11, UE sends wireless heterogeneous networks (RadioResource Control, RRC) connection to target BS and has reshuffled message (RRC ConnectionReconfiguration Complete).
Then, in step P12, target BS is to Mobility Management Entity (MobilityManagement Entity, MME) transmit path handover request (Path Switch Request).
Then, in step P13, MME sends user face update request (User Plane Update Request) to gateway (Serving Gateway, SGW).
Gateway conversion switches the path of down link data to target BS in step S14, and in step P15, sends user face update request response (User Plane UpdateRequest Response) to MME.
Then, in step P16, MME transmit path switching request acknowledgement message (PathSwitch Request Ack) is to target BS.
Then, in step P17, target BS sends UE resource release message (UE Context Release) to source base station, with the resource of notification source base station release UE in source base station.
Finally, source base station discharges related resource in step P18, and switching completes.
Wherein, step P2 belongs to handoff preparation phase to step P7, and step P7 belongs to handover execution stage to step P11, and step P11 to step P18 belongs to switching and completes the stage.
In the process, handoff preparation phase, and step P2 is to step P7, subscriber equipment can be made to produce switching delay, and this switching delay may continue several milliseconds.
Situation two: the switching not needing measurement clearance (Measurement Gap) between base station, frequency
If UE self completes different-frequency measure without the need to measurement clearance, then handoff procedure is now identical with the step P1 to P18 in Fig. 2, repeats no more.
Situation three: the switching needing measurement clearance between base station, frequency
For the switching needing measurement clearance between frequency, source base station needs configuration UE to start different-frequency measure, namely the handoff procedure in this situation needs to increase the step that activation measurement clearance carries out different-frequency measure between step P2 in fig. 2 and step P3, other part is identical with step P1 to P18, repeats no more.
In this case, due to during measurement clearance, the transfer of data of UE can be interrupted, thus can reduce the throughput of system.
Situation four: the switching in base station, frequency
Fig. 3 shows the flow chart of the handoff procedure in base station, frequency.
With reference to Fig. 3, in step Q1, UE and MME/SGW carries out transfer of data.
In step Q2, UE sends measurement report to source base station, and wherein, described measurement report generates based on A3 event usually.
In step Q3, source base station carries out switch decision according to measurement report.
In step q 4, source base station sets up the relevant resource of UE in Target cell.
In step Q5, source base station carrys out order UE to UE transmission wireless resource control connection reconfiguration message (RRC Connection Reconfiguration) and switches;
In step Q6, source base station switches down link to Target cell and the uplink data started in receiving target community;
In step Q7, UE departs from from original community and is synchronized to new community;
Then, in step Q8, UE sends wireless resource control connection reconfiguration to target BS and completes message (RRC Connection Reconfiguration Complete);
Finally, in step Q9, the resource that source base station release UE takies in cell-of-origin, switching completes.
Wherein, the switching delay of subscriber equipment can be caused in the process of Q2 to step Q5, and this switching delay may continue several milliseconds, add the packet loss in handoff procedure, affect Consumer's Experience.
Situation five: the switching not needing measurement clearance between base station, frequency
If UE self completes different-frequency measure without the need to measurement clearance, then handoff procedure is now identical to step Q9 with the step Q1 in Fig. 3, repeats no more.
Situation six: the switching needing measurement clearance between base station, frequency
Handoff procedure in this situation needs to increase the step that activation measurement clearance carries out different-frequency measure between step Q2 in figure 3 and step Q3, and other part is identical to step Q9 with step Q1 in situation four, repeats no more.
Can find out, according to the scheme of prior art, all can produce longer switching delay (handover latency), it may increase the packet loss in handoff procedure.Further, for the switching between frequency, UE needs measurement clearance to carry out the measurement of alien frequencies usually, and for LTEHBS system, during measurement clearance, the transfer of data of TBAU can be affected, and then reduces the throughput of system.
Summary of the invention
The object of this invention is to provide a kind of method and base station for reducing switching delay in the source base station (base station) of train broadband access system.
According to an aspect of the present invention, providing a kind of method for reducing switching delay in the source base station (eNB) of train broadband access system, wherein, said method comprising the steps of:
A sends measuring control information to subscriber equipment;
B receive from subscriber equipment, the first measurement report of generating based on described measuring control information;
C, after receiving described first measurement report, determines the destination object that described subscriber equipment can switch to;
Connection reconfiguration information that is corresponding with described destination object, that be used for switching is sent to described subscriber equipment by d;
E receives the second measurement report that described subscriber equipment generates based on aforementioned measuring control information.
According to an aspect of the present invention, additionally providing a kind of method for reducing switching delay in the subscriber equipment of train broadband access system, wherein, said method comprising the steps of:
-receive measuring control information from source base station (eNB);
-based on described measuring control information, generate the first measurement report;
-described first measurement report is sent to source base station;
-receive from described source base station, for performing the connection reconfiguration information of switching and storing;
-generate the second measurement report based on measuring control information and be sent to described source base station;
-send the second measurement report after start to switch according to stored connection reconfiguration message.
According to an aspect of the present invention, additionally provide a kind of base station for reducing switching delay in train broadband access system, wherein, described base station comprises:
First dispensing device, for sending measuring control information to subscriber equipment;
First receiving device, for receive from subscriber equipment, the first measurement report of generating based on described measuring control information;
Determining device, for after receiving described first measurement report, determines the destination object that described subscriber equipment can switch to;
Second dispensing device, for being sent to described subscriber equipment by connection reconfiguration information that is corresponding with described destination object, that be used for switching;
Second receiving system, for receiving the second measurement report that described subscriber equipment generates based on aforementioned measuring control information.
According to an aspect of the present invention, additionally provide a kind of subscriber equipment for reducing switching delay in train broadband access system, wherein, described subscriber equipment comprises:
4th receiving system, for receiving the measuring control information from source base station (base station);
Second generating apparatus, for based on described measuring control information, generates the first measurement report;
4th dispensing device, for being sent to source base station by described first measurement report;
5th receiving system, for receive from described source base station, for performing the connection reconfiguration information of switching and storing;
5th dispensing device, for generating the second measurement report based on measuring control information and being sent to described source base station;
Switching device shifter, starts to switch according to stored connection reconfiguration message after sending the second measurement report.
Compared with prior art, the present invention has the following advantages: based on the one-way that in train broadband access system, This train is bound for XXX, by using based on the first measurement report of A2 event and starting the preparatory stage of switching and the execution of switching respectively based on A2 or A3 event second measurement report, thus reduce the switching delay lasting time, and the trigger point that subscriber equipment starts to perform switching can be controlled accurately; For the situation needing measurement clearance, the present invention triggers the first measurement report and the second measurement report respectively by using two A2 events, avoids and activates measurement clearance to carry out the process of different-frequency measure, thus avoid the impact of measurement clearance on throughput.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 shows a kind of Organization Chart of bullet train communication system;
Fig. 2 show in prior art based between the base station of X2 interface, the flow chart of handoff procedure in frequency;
Fig. 3 shows the flow chart of the handoff procedure in prior art in base station, frequency;
Fig. 4 shows according to a kind of method flow diagram for the switching between the middle base station reducing switching delay of the source base station (eNB) of train broadband access system of the present invention;
The method flow diagram of the switching between Fig. 5 shows according to the base station of a modification of the present invention;
Fig. 6 shows the method flow diagram according to the switching in the base station of a modification of the present invention;
Fig. 7 shows according to of the present invention a kind of for reducing the base station of switching delay and the structural representation of subscriber equipment in train broadband access system;
In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 4 shows according to a kind of method flow diagram for the switching between the middle base station reducing switching delay of the source base station (base station) of train broadband access system of the present invention.Wherein, according to method of the present invention, subscriber equipment switches to destination object by the cell-of-origin in source base station.
Wherein, method according to the present invention comprises the step S101, step S102, step S103, step S104 and the step 105 that are performed by base station, and the step S201, step S202, step S203, step S204, step S205 and the step S206 that are performed by subscriber equipment.Composition graphs 2, because method according to the present invention is the improvement on the basis based on the switching flow between the base station shown in Fig. 2, therefore, all the other are still identical with the step in Fig. 2 for the step performing handoff procedure.
Wherein, described train broadband access system includes but not limited to the wireless communication system based on 3GPP LTE.Described base station includes but not limited to the macro base station, micro-base station, Home eNodeB etc. that can be applicable to described Long-Term Evolution high-speed backbone system.Preferably, described base station comprises base station high-speed backbone.Described subscriber equipment comprises and wirelessly directly or indirectly and the electronic installation of base station communication, can include but not limited to mobile phone, PDA etc.Preferably, as the mediation device of each terminal equipment, the equipment carrying out with base station directly or indirectly communicating also can by the subscriber equipment can regarded as in the present invention, such as, train broadband access unit (Train Broadband Access Unit, TBAU) etc. in train broadband access system.
With reference to Fig. 4, in step S101, source base station sends measuring control information to subscriber equipment.
Wherein, described measuring control information (Measurement Control) carrys out the measuring process of configure user equipment for communication quality.
Preferably, described measuring control information includes but not limited to indicate the information such as measurement mark, measuring command, measuring amount and the measurement report criterion relevant to the measuring process of subscriber equipment.
More preferably, described measuring control information comprises the information of the event type being used to indicate subscriber equipment generation measurement report time institute foundation.
More preferably, the information that equipment for indicating user generates the first measurement report and the second measurement report is comprised in described measuring control information, wherein, described first measurement report can generate based on A2 event, and described second measurement report can generate based on A2 or A3 event.Wherein, the definition of the A2 event described in the present invention and A3 event be can refer to the content of the 5.5.4 chapters and sections in LTE36.331 agreement.
It should be noted that, the event after further expanding above-mentioned A2 or A3 event or improve, as can be applicable to the present invention, also should be contained in this.
In step s 201, subscriber equipment receives the measuring control information from source base station.
Then, in step S202, subscriber equipment, based on described measuring control information, generates the first measurement report.
Particularly, subscriber equipment, based on measuring control information, is measured the relevant information of the A2 event for generating the first measurement report, and when determining that this relevant information meets the trigger condition of A2 event, generates the first measurement report.
Then, in step S203, described first measurement report is sent to source base station by subscriber equipment.
Then, in step s 102, source base station receive from subscriber equipment, the first measurement report of generating based on described measuring control information.
Then, in step s 103, source base station, after receiving described first measurement report, determines the destination object that described subscriber equipment can switch to.Preferably, described destination object comprise following any one:
1) target BS;
2) Target cell in described origin base station cell.
Preferably, source base station is according to described first measurement report and This train is bound for XXX, determines the destination object that described subscriber equipment can switch to.
Particularly, source base station obtains the cell information adjacent with cell-of-origin self prestored, and obtains the directional information of train driving, then, according to This train is bound for XXX, selects the neighbor cell being applicable to carrying out switching as Target cell.
Preferably, source base station selects to be positioned at the neighbor cell that This train is bound for XXX or position near the neighbor cell that This train is bound for XXX as the Target cell being applicable to carrying out switching.
Such as, source base station gets the community adjacent with cell-of-origin community A and community B, northwest that its small area A is positioned at cell-of-origin to, community B is positioned at the southeastern direction of cell-of-origin, and, the travel direction that source base station gets train is south by east 37 degree, then source base station is according to the travel direction of train, selects to be positioned at community B as Target cell near what This train is bound for XXX.
Wherein, those skilled in the art should be able to determine to obtain the mode that This train is bound for XXX according to actual conditions and demand, repeat no more herein.
Then, source base station performs and switches beamhouse operation accordingly.
It should be noted that, because method according to the present invention is by generating the second measurement report based on A2 event, thus the measurement clearance avoided between frequency in handoff procedure, the process of the method according to the switching in base station of the present invention shown in Fig. 5 is applicable to afore-mentioned one, the handoff procedure of situation two and situation three, the process of the method according to the switching in base station of the present invention shown in Fig. 6 is applicable to above-mentioned situation four, the handoff procedure of situation five and situation six.
Then, in step S104, connection reconfiguration information that is corresponding with described destination object, that be used for switching is sent to described subscriber equipment by source base station.
According to a preferred embodiment of the present invention, with reference to Fig. 5, subscriber equipment switches to target BS from source base station.Wherein, the step S106 and step S107 that are performed by source base station is also comprised according to method of the present invention.
In step s 106, source base station sends handover request to described target BS.
Then, in step s 107, the switching confirmation that source base station receiving target base station is fed back based on described handover request, wherein, described switching confirmation comprises described connection reconfiguration information.
Preferably, source base station also performs other existing operations as shown in Figure 5, as carried out the operations such as switching judging according to measurement report, realizes switching preparation.
According to another preferred embodiment of the present invention, with reference to Fig. 6, subscriber equipment switches to the Target cell in this source base station from the cell-of-origin source base station.Wherein, the step S108 performed by source base station is also comprised according to method of the present invention.
In step S108, source base station generates and connects reconfiguration information.
Preferably, source base station also performs other existing operations as shown in Figure 6, as set up the operations such as the resource relevant to subscriber equipment, realizes switching preparation.
Then, in step S204, subscriber equipment receive from described source base station, for performing the connection reconfiguration information of switching and storing.
Then, in step S205, subscriber equipment generates the second measurement report based on measuring control information and is sent to described source base station.
Particularly, subscriber equipment, based on measuring control information, continues to measure the relevant information of A2 or the A3 event for generating the second measurement report, and when determining that this relevant information meets the trigger condition of A2 or A3 event, generates the second measurement report.
Then, in step S206, start to switch according to stored connection reconfiguration message after subscriber equipment sends the second measurement report.Such as, subscriber equipment starts the step P9 performed in Fig. 2, to be synchronized to target BS.
In step S105, source base station receives the second measurement report that described subscriber equipment generates based on aforementioned measuring control information.
Then, subscriber equipment, by performing the handover operation similar to prior art, has carried out switching.Such as, when performing the switching between base station, subscriber equipment is by performing as the step P9 in Fig. 2 to step P11 is synchronized to the operation of target BS, again such as, when performing the switching between base station, subscriber equipment is by performing as the step Q6 in Fig. 3 to step Q7 is synchronized to the operation etc. of Target cell.
Such as, dispose train broadband access system in train, in train, the terminal equipment of the use of all passengers is linked into network by TBAU, and the TBAU in this system can be taken as subscriber equipment.Source base station sends measuring control information to TBAU in step S101.This measuring control information comprises: the first measurement report generates based on A2 event Event_A2_Prepare; When performed switching to switches between frequency, described second measurement report generates based on A2 event Event_A2_HO; When performed switch to intra-frequency time, described second measurement report generates based on A3 event Event_A3_HO.When meeting the trigger condition of Event_A2_Prepare event, TBAU generates the first measurement report and in step S203, described first measurement report is sent to source base station in step S202.Then, in step s 103, after source base station receives the first measurement report, according to described first measurement report and This train is bound for XXX, using the base station belonging to the neighbor cell cell_1 near train direction of advance as target BS.Source base station sends handover request Ho_Request to the target BS determined, and the switching confirmation Ho_Request_Ack that receiving target base station is fed back based on described handover request, wherein, Ho_Request_Ack comprises the connection reconfiguration information RRC_Conn_Reconf for switching.Then, in step S104, RRC_Conn_Reconf is sent to TBAU by source base station.TBAU receive in step S204 from described source base station, for performing the connection reconfiguration information of switching and storing.Then, TBAU continues the transfer of data between source base station, until when meeting the trigger condition of Event_A3_HO, TBAU generates the second measurement report and is sent to described source base station in step S205.Source base station receives the second measurement report that TBAU generates based on aforementioned measuring control information in step S105.Further, TBAU starts to perform the operation being synchronized to Target cell cell_1, to switch according to stored connection reconfiguration message RRC_Conn_Reconf after transmission second measurement report.
Can find out, according to Fig. 4 according in changing method of the present invention, due to Target cell can be determined according to the unicity that This train is bound for XXX, therefore can send the first measurement report to source base station when A2 event meets and carry out switching beamhouse operation accordingly to enable source base station, subscriber equipment self then can after sending the second measurement report to cell-of-origin, can clearly start to perform handover operation, and without the need to as prior art, after have sent a measurement report, need the associative operation waiting for source base station, could start to perform switching, thus significantly reduce the switching delay of subscriber equipment.
According to method of the present invention, based on the one-way that in train broadband access system, This train is bound for XXX, by using based on the first measurement report of A2 event and starting the preparatory stage of switching and the execution of switching respectively based on A2 or A3 event second measurement report, thus reduce the switching delay lasting time, and the trigger point that subscriber equipment starts to perform switching can be controlled accurately; For the situation needing measurement clearance, the present invention triggers the first measurement report and the second measurement report respectively by using two A2 events, avoids and activates measurement clearance to carry out the process of different-frequency measure, thus avoid the impact of measurement clearance on throughput.
Fig. 7 shows according to of the present invention a kind of for reducing the base station of switching delay and the structural representation of subscriber equipment in train broadband access system.Base station according to the present invention comprises the first dispensing device 101, first receiving device 102, determining device 103, second dispensing device 104 and the second receiving system 105.Subscriber equipment according to the present invention comprises the 4th receiving system 201, second generating apparatus 202, the 4th dispensing device 203, the 5th receiving system 204, the 5th dispensing device 205 and switching device shifter 206
With reference to Fig. 4, the first dispensing device 101 sends measuring control information to subscriber equipment.
Wherein, described measuring control information (Measurement Control) carrys out the measuring process of configure user equipment for communication quality.
Preferably, described measuring control information includes but not limited to indicate the information such as measurement mark, measuring command, measuring amount and the measurement report criterion relevant to the measuring process of subscriber equipment.
More preferably, described measuring control information comprises the information of the event type being used to indicate subscriber equipment generation measurement report time institute foundation.
More preferably, the information that equipment for indicating user generates the first measurement report and the second measurement report is comprised in described measuring control information, wherein, described first measurement report can generate based on A2 event, and described second measurement report can generate based on A2 or A3 event.
Then, the 4th receiving system 201 receives the measuring control information from source base station.
Then, the second generating apparatus 202, based on described measuring control information, generates the first measurement report.
Particularly, the second generating apparatus 202, based on measuring control information, is measured the relevant information of the A2 event for generating the first measurement report, and when determining that this relevant information meets the trigger condition of A2 event, generates the first measurement report.
Then, described first measurement report is sent to source base station by the 4th dispensing device 203.
Then, first receiving device 102 receive from subscriber equipment, the first measurement report of generating based on described measuring control information.
Then, really after receiving described first measurement report, determine device 103 and determine the destination object that described subscriber equipment can switch to.Preferably, described destination object comprise following any one:
1) target BS;
2) Target cell in described origin base station cell.
Preferably, determining device 103 is according to described first measurement report and This train is bound for XXX, determines the destination object that described subscriber equipment can switch to.
Particularly, determining device 103 obtains the cell information adjacent with cell-of-origin self prestored, and obtains the directional information of train driving, then, according to This train is bound for XXX, selects the neighbor cell being applicable to carrying out switching as Target cell.
Preferably, determining device 103 selects to be positioned at the neighbor cell that This train is bound for XXX or position near the neighbor cell that This train is bound for XXX as the Target cell being applicable to carrying out switching.
Such as, determining device 103 gets the community adjacent with cell-of-origin community A and community B, northwest that its small area A is positioned at cell-of-origin to, community B is positioned at the southeastern direction of cell-of-origin, and, the travel direction that determining device 103 gets train is south by east 37 degree, then determining device 103 is according to the travel direction of train, selects to be positioned at community B as Target cell near what This train is bound for XXX.
Wherein, those skilled in the art should be able to determine to obtain the mode that This train is bound for XXX according to actual conditions and demand, repeat no more herein.
Then, source base station performs and switches beamhouse operation accordingly.
Preferably, source base station also performs other existing operations as shown in Figure 6, as set up the operations such as the resource relevant to UE, realizes switching preparation.
It should be noted that, because according to the solution of the present invention by generating the second measurement report based on A2 event, thus the measurement clearance avoided between frequency in handoff procedure, the process of the scheme according to the switching in base station of the present invention shown in Fig. 5 is applicable to afore-mentioned one, the handoff procedure of situation two and situation three, the process of the method according to the switching in base station of the present invention shown in Fig. 6 is applicable to above-mentioned situation four, the handoff procedure of situation five and situation six.
Then, connection reconfiguration information that is corresponding with described destination object, that be used for switching is sent to described subscriber equipment by the second dispensing device 104.
According to a preferred embodiment of the present invention, with reference to Fig. 5, subscriber equipment switches to target BS from source base station.Wherein, the 3rd dispensing device (not shown) and the 3rd receiving system (not shown) is also wrapped according to base station of the present invention.
3rd dispensing device sends handover request to target BS.
Then, the switching confirmation that the 3rd receiving system receiving target base station is fed back based on described handover request, wherein, described switching confirmation comprises described connection reconfiguration information.
Preferably, source base station also performs other existing operations as shown in Figure 5, as carried out the operations such as switching judging according to measurement report, realizes switching preparation.
According to another preferred embodiment of the present invention, with reference to Fig. 6, subscriber equipment switches to the Target cell in this source base station from the cell-of-origin source base station.Wherein, base station according to the present invention also comprises generating apparatus.
After completing at source base station the operation switching and prepare, generating apparatus generates and connects reconfiguration information.
Then, the 5th receiving system 204 receive from described source base station, for performing the connection reconfiguration information of switching and storing.
Then, the 5th dispensing device 205 generates the second measurement report based on measuring control information and is sent to described source base station.
Particularly, the 5th dispensing device 205, based on measuring control information, continues to measure the relevant information of A2 or the A3 event for generating the second measurement report, and when determining that this relevant information meets the trigger condition of A2 or A3 event, generates the second measurement report.
Then, start to switch according to stored connection reconfiguration message after switching device shifter 206 sends the second measurement report.Such as, subscriber equipment starts the step P9 performed in Fig. 2, to be synchronized to target BS.
Second receiving system 105 receives the second measurement report that described subscriber equipment generates based on aforementioned measuring control information.
Then, subscriber equipment, by performing the handover operation similar to prior art, has carried out switching.Such as, when performing the switching between base station, subscriber equipment is by performing as the step P9 in Fig. 2 to step P11 is synchronized to the operation of target BS, again such as, when performing the switching between base station, subscriber equipment is by performing as the step Q6 in Fig. 3 to step Q7 is synchronized to the operation etc. of Target cell.
Such as, dispose train broadband access system in train, in train, the terminal equipment of the use of all passengers is linked into network by TBAU, and the TBAU in this system can be taken as subscriber equipment.First dispensing device 101 of source base station sends measuring control information to TBAU.This measuring control information comprises: the first measurement report generates based on A2 event Event_A2_Prepare; When performed switching to switches between frequency, described second measurement report generates based on A2 event Event_A2_HO; When performed switch to intra-frequency time, described second measurement report generates based on A3 event Event_A3_HO.When meeting the trigger condition of Event_A2_Prepare event, the second generating apparatus 202 in TBAU generates the first measurement report and by the 4th dispensing device 203, described first measurement report is sent to source base station.Then, after the first receiving device 102 of source base station receives the first measurement report, the determining device 103 of source base station is according to described first measurement report and This train is bound for XXX, using the base station belonging to the neighbor cell cell_1 near train direction of advance as target BS.Then, 3rd dispensing device of source base station sends handover request Ho_Request to the target BS determined, and the switching confirmation Ho_Request_Ack fed back based on described handover request by the 3rd receiving system receiving target base station of source base station, wherein, Ho_Request_Ack comprises the connection reconfiguration information RRC_Conn_Reconf for switching.Then, RRC_Conn_Reconf is sent to TBAU by the second dispensing device 104 of source base station.The 5th receiving system 204 in TBAU receive from described source base station, for performing the connection reconfiguration information of switching and storing.Then, TBAU continues the transfer of data between source base station, until when meeting the trigger condition of Event_A3_HO, the 5th dispensing device 205 in TBAU generates the second measurement report and is sent to described source base station.The second measurement report that subscriber equipment described in TBAU generates based on aforementioned measuring control information is received in the second receiving system 105 in source base station.Further, after transmission second measurement report, the switching device shifter in TBAU starts to perform the operation being synchronized to Target cell cell_1, to switch according to stored connection reconfiguration message RRC_Conn_Reconf.
Can find out, according to Fig. 4 according in handover scheme of the present invention, due to Target cell can be determined according to the unicity that This train is bound for XXX, therefore can send the first measurement report to source base station when A2 event meets and carry out switching beamhouse operation accordingly to enable source base station, subscriber equipment self then can after sending the second measurement report to cell-of-origin, can clearly start to perform handover operation, and without the need to as prior art, after have sent a measurement report, need the associative operation waiting for source base station, could start to perform switching, thus significantly reduce the switching delay of subscriber equipment.
According to the solution of the present invention, based on the one-way that in train broadband access system, This train is bound for XXX, by using based on the first measurement report of A2 event and starting the preparatory stage of switching and the execution of switching respectively based on A2 or A3 event second measurement report, thus reduce the switching delay lasting time, and the trigger point that subscriber equipment starts to perform switching can be controlled accurately; For the situation needing measurement clearance, the present invention triggers the first measurement report and the second measurement report respectively by using two A2 events, avoids and activates measurement clearance to carry out the process of different-frequency measure, thus avoid the impact of measurement clearance on throughput.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.In addition, obviously " comprising " one word do not get rid of other unit or step, odd number does not get rid of plural number.Multiple unit of stating in system claims or device also can be realized by software or hardware by a unit or device.First, second word such as grade is used for representing title, and does not represent any specific order.
Claims (15)
1., for reducing a method for switching delay in the source base station (eNB) of train broadband access system, wherein, said method comprising the steps of:
A sends measuring control information to subscriber equipment;
B receive from subscriber equipment, the first measurement report of generating based on described measuring control information;
C, after receiving described first measurement report, determines the destination object that described subscriber equipment can switch to;
Connection reconfiguration information that is corresponding with described destination object, that be used for switching is sent to described subscriber equipment by d;
E receives the second measurement report that described subscriber equipment generates based on aforementioned measuring control information.
2. method according to claim 1, wherein, described step c comprises the following steps:
-according to described first measurement report and This train is bound for XXX, determine the destination object that described subscriber equipment can switch to.
3. the method according to claim 1 and 2, wherein, described destination object comprises target BS, and wherein, described method is further comprising the steps of:
-send handover request to described target BS;
The switching confirmation that-receiving target base station is fed back based on described handover request, wherein, described switching confirmation comprises described connection reconfiguration information.
4. the method according to claim 1 and 2, wherein, described destination object comprises the Target cell in described source base station, and wherein, described method is further comprising the steps of:
-generate connection reconfiguration information.
5. method according to any one of claim 1 to 4, wherein, described first measurement report generates based on A2 event; Wherein, when performed switching to switches between frequency, described second measurement report generates based on A2 event; When performed switch to intra-frequency time, described second measurement report generates based on A2 or A3 event.
6., for reducing a method for switching delay in the subscriber equipment of train broadband access system, wherein, said method comprising the steps of:
-receive measuring control information from source base station (eNB);
-based on described measuring control information, generate the first measurement report;
-described first measurement report is sent to source base station;
-receive from described source base station, for performing the connection reconfiguration information of switching and storing;
-generate the second measurement report based on measuring control information and be sent to described source base station;
-send the second measurement report after start to switch according to stored connection reconfiguration message.
7. method according to claim 6, wherein, described first measurement report generates based on A2 event; Wherein, when performed switching to switches between frequency, described second measurement report generates based on A2 event; When performed switch to intra-frequency time, described second measurement report generates based on A3 event.
8., for reducing a base station for switching delay in train broadband access system, wherein, described base station comprises:
First dispensing device, for sending measuring control information to subscriber equipment;
First receiving device, for receive from subscriber equipment, the first measurement report of generating based on described measuring control information;
Determining device, for after receiving described first measurement report, determines the destination object that described subscriber equipment can switch to;
Second dispensing device, for being sent to described subscriber equipment by connection reconfiguration information that is corresponding with described destination object, that be used for switching;
Second receiving system, for receiving the second measurement report that described subscriber equipment generates based on aforementioned measuring control information.
9. base station according to claim 8, wherein, described determining device also for:
-according to described first measurement report and This train is bound for XXX, determine the destination object that described subscriber equipment can switch to.
10. base station according to claim 9, wherein, described destination object comprises target BS, and wherein, described base station comprises:
3rd dispensing device, for sending handover request to described target BS;
3rd receiving system, for the switching confirmation that receiving target base station is fed back based on described handover request, wherein, described switching confirmation comprises described connection reconfiguration information.
Base station described in 11. according to Claim 8 with 9, wherein, described destination object comprises the Target cell in described base station, and wherein, described base station also comprises:
First generating apparatus, for generating connection reconfiguration information.
Base station according to any one of 12. according to Claim 8 to 11, wherein, described first measurement report generates based on A2 event; Wherein, when performed switching to switches between frequency, described second measurement report generates based on A2 event; When performed switch to intra-frequency time, described second measurement report generates based on A2 or A3 event.
13. 1 kinds for reducing the subscriber equipment of switching delay in train broadband access system, wherein, described subscriber equipment comprises:
4th receiving system, for receiving the measuring control information from source base station (eNB);
Second generating apparatus, for based on described measuring control information, generates the first measurement report;
4th dispensing device, for being sent to source base station by described first measurement report;
5th receiving system, for receive from described source base station, for performing the connection reconfiguration information of switching and storing;
5th dispensing device, for generating the second measurement report based on measuring control information and being sent to described source base station;
Switching device shifter, starts to switch according to stored connection reconfiguration message after sending the second measurement report.
14. subscriber equipmenies according to claim 13, wherein, described first measurement report generates based on A2 event; Wherein, when performed switching to switches between frequency, described second measurement report generates based on A2 event; When performed switch to intra-frequency time, described second measurement report generates based on A2 or A3 event.
15. 1 kinds of train broadband access systems, wherein, described train broadband access system comprises the base station described in one or more according to Claim 8 to 12, and one or more according to claim 13 to the subscriber equipment described in 14.
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