CN107404738A - Cell switching method, apparatus and system - Google Patents
Cell switching method, apparatus and system Download PDFInfo
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- CN107404738A CN107404738A CN201610331548.3A CN201610331548A CN107404738A CN 107404738 A CN107404738 A CN 107404738A CN 201610331548 A CN201610331548 A CN 201610331548A CN 107404738 A CN107404738 A CN 107404738A
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- downlink data
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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
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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Abstract
The invention provides a kind of cell switching method, apparatus and system, wherein, this method is applied during user equipment (UE) switches over from source base station to target BS, including：Source base station sends radio resource control RRC connection reconfiguration message to the UE；The source base station sends the downlink data state report of the UE according to predetermined period to the target BS, wherein, the downlink data state report is used to indicate that the source base station, by the present invention, solves the problems, such as service disconnection occur when UE is switched to target BS from source base station in correlation technique to the state of the UE downlink datas transmitted.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of cell switching method, device
And system.
Background technology
Long Term Evolution (Long Term Evolution, LTE) network includes the general land of evolution
Ground wireless access network (Evolved Universal Terrestrial Radio Access Network,
) and core net (Core Network, CN) E-UTRAN.E-UTRAN includes evolution
Base station (evolved Node B, eNB).CN includes mobile management entity (Mobile
Management Entity, MME) and gateway (Serving Gateway, S-GW)
Deng.Connected by S1 interfaces between eNB and CN, can be connected between eNB by X2 interface
Connect.One eNB can manage one or more cells (Cell).User equipment (User
Equipment, UE) interface between cell is referred to as Uu mouths (or eating dishes without rice or wine).
In the LTE system of correlation technique, UE be switched to from eNB cell it is another
During individual eNB cell, can first disconnect with the connection of cell-of-origin, then carry out and target
The connection of cell, this will cause UE the service disconnection of short time occur.One kind avoids UE from going out
The method that existing short time service interrupts is that UE is kept and cell-of-origin as far as possible in handoff procedure
Connection is connected until UE is successfully established with Target cell.But target eNB is it is determined that target
When cell can send downlink data to UE, there is no the descending of correlation in target eNB
Data and downlink data state report, are connected even if being established with target BS, or nothing
Method sends downlink data to UE in time, so as to which of short duration service disconnection still occur.
For above mentioned problem present in correlation technique, at present it is not yet found that the solution of effect.
The content of the invention
The embodiments of the invention provide a kind of cell switching method, apparatus and system, at least to solve
There is the problem of service disconnection when certainly UE is switched to target BS from source base station in correlation technique.
According to one embodiment of present invention, there is provided a kind of cell switching method, apply with
During family equipment UE switches over from source base station to target BS, including：Source base station to
The UE sends wireless heterogeneous networks (Radio Resource Control, referred to as RRC)
Connect reconfiguration message；The source base station is according to described in predetermined period to target BS transmission
UE downlink data state report, wherein, the downlink data state report is used to indicate institute
Source base station is stated to the state of the UE downlink datas transmitted.
Alternatively, disappear in source base station to UE transmissions wireless resource control connection reconfiguration
After breath, methods described also includes：The source base station carries out the UE to the target BS
Downlink data forwarding.
Alternatively, in the source base station according to described in predetermined period to target BS transmission
After UE downlink data state report, methods described also includes：The source base station receives institute
The downlink data state report expiry notification of target BS transmission is stated, wherein, the downlink data
State report expiry notification is used to start to send downlink data to the UE in the target BS
When, indicate that the source base station stops sending the downlink data state report.
Alternatively, the downlink data state report of the target BS transmission is received in the source base station
After accusing expiry notification, methods described also includes：The source base station judges the UE described
Whether the downlink data not forwarded also be present on source base station；If it is judged that be yes, continue to
The target BS forwards the downlink data of the UE.
Alternatively, the downlink data state report is sent by the first X2 application protocol messages.
Alternatively, the downlink data state report includes wireless with the general land of the UE
Information related access network RAB E-RAB.
Alternatively, the information related to the E-RAB of the UE includes at least one of：
E-RAB marks, the target BS descending protocol data unit (Protocol Data to be allocated
Unit, referred to as PDU) PDCP PDCP sequence numbers and Hyper Frame Number HFN,
The source base station does not send the successful first descending PDU PDCP to the UE first
The transmission state of the second descending PDU after SN and HFN, the first descending PDU.
Alternatively, the downlink data state report is disappeared by SN STATUS TRANSFER
Breath (serial-number-state forwarding message) is transmitted.
Alternatively, the downlink data state report includes at least one of：Downlink data shape
Configured information, the information related to the E-RAB of the UE of state report, wherein, with institute
Stating the information of UE E-RAB correlations includes at least one of：The source base station is to described
UE first does not send the successful first descending PDU PDCP SN and HFN, described
The transmission state of the second descending PDU after one descending PDU.
Alternatively, the described second descending PDU transmission state is represented using bit string,
Wherein, 0 represent not send success, 1 represents to have sent success.
Alternatively, the downlink data state report expiry notification is connect by the 2nd X2AP message
Receive, wherein, the downlink data state report expiry notification includes being used to stop sending lower line number
According to the instruction of state report.
Alternatively, the downlink data state report expiry notification passes through UE CONTEXT
RELEASE (context release) message is transmitted, wherein, the downlink data state
Report that expiry notification includes being used to stop the instruction for sending downlink data state report.
According to one embodiment of present invention, there is provided another cell switching method, apply
During user equipment (UE) switches over from source base station to target BS, including：Target base
Stand and receive the downlink data state report for the UE that source base station is sent, wherein, the downlink data
State report is used to indicate the source base station to the state of the UE downlink datas transmitted；Institute
Target BS is stated when it is determined that sending downlink data to the UE, according to the downlink data shape
State, which is reported to the UE, sends downlink data.
Alternatively, downlink data is being sent to the UE according to the downlink data state report
When, methods described also includes：The target BS sends downlink data shape to the source base station
State reports expiry notification, wherein, the downlink data state report expiry notification is used to indicate institute
Source base station is stated to stop sending the downlink data state report.
According to another embodiment of the invention, there is provided a kind of cell switching device, apply
User equipment (UE) from source base station into the source base station that target BS switches over, including：First
Sending module, for sending radio resource control RRC connection reconfiguration message to the UE；
Second sending module, for being sent according to predetermined period to the target BS under the UE
Row data status report, wherein, the downlink data state report is used to indicate the source base station
The state of the downlink data transmitted to the UE.
According to another embodiment of the invention, there is provided another cell switching device, application
User equipment (UE) from source base station into the target BS that target BS switches over, including：
Receiving module, the downlink data state report of the UE for receiving source base station transmission, wherein,
The downlink data state report is used to indicate the lower line number that the source base station transmits to the UE
According to state；Sending module, for it is determined that to the UE send downlink data when, according to
The downlink data state report sends downlink data to the UE.
According to still another embodiment of the invention, there is provided a kind of cell handover system, including source
Base station, target BS, UE, wherein, the source base station, for being sent to the UE
After radio resource control RRC connection reconfiguration message, according to predetermined period to the target
Base station sends the downlink data state report of the UE, wherein, the downlink data state report
Accuse for indicating the source base station to the state of the UE downlink datas transmitted；The target
Base station, for receive source base station transmission UE downlink data state report, and it is determined that to
When the UE sends downlink data, sent out according to the downlink data state report to the UE
Send downlink data.
According to still another embodiment of the invention, a kind of storage medium is additionally provided.The storage is situated between
Matter is arranged to the program code that storage is used to perform following steps：
Radio resource control RRC connection reconfiguration message is sent to the UE；
The downlink data state report of the UE is sent to the target BS according to predetermined period,
Wherein, the downlink data state report is used to indicate what the source base station transmitted to the UE
The state of downlink data.
By the present invention, source base station sends radio resource control RRC connection weight to the UE
After configuring message, the lower line number of the UE is sent to the target BS according to predetermined period
According to state report, wherein, the downlink data state report is used to indicate the source base station to institute
State UE transmission downlink data state, due to source base station to target BS have sent UE with
The downlink data state report of downlink data is transmitted between source base station, therefore target BS can obtain
Downlink data transmission situations of the UE on source base station is known, so as to be established in target BS and UE
Transmission UE downlink data can timely be continued after connection, service disconnection is avoided, can solve
There is the problem of service disconnection when certainly UE is switched to target BS from source base station in correlation technique,
The effect of lifting Consumer's Experience is reached.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the application
A part, schematic description and description of the invention is used to explain the present invention, not structure
Into inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the eNB using cell switching method of embodiment of the present invention hardware configuration frame
Figure；
Fig. 2 is a kind of flow chart of cell switching method according to embodiments of the present invention；
Fig. 3 is the flow chart of another cell switching method according to embodiments of the present invention；
Fig. 4 is a kind of structured flowchart of cell switching device according to embodiments of the present invention；
Fig. 5 is the structured flowchart of another cell switching device according to embodiments of the present invention；
Fig. 6 is the structured flowchart of cell handover system according to embodiments of the present invention；
Fig. 7 is the switching method flow chart of according to embodiments of the present invention 3 optimization.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.Need what is illustrated
It is that, in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.
It should be noted that the art in description and claims of this specification and above-mentioned accompanying drawing
Language " first ", " second " etc. are for distinguishing similar object, without specific for describing
Order or precedence.
Embodiment 1
The embodiment of the method that the embodiment of the present application one is provided can eNB, terminal or
Performed in the similar arithmetic unit of person.Exemplified by operating in base station eNB, Fig. 1 is this hair
The eNB using cell switching method of bright embodiment hardware block diagram.As shown in figure 1,
ENB10 can include one or more (processors of (one is only shown in figure) processor 102
102 can include but is not limited to Micro-processor MCV or PLD FPGA etc.
Processing unit), the memory 104 for data storage and the transmission for communication function
Device 106.It will appreciated by the skilled person that the structure shown in Fig. 1 is only to illustrate,
It does not cause to limit to the structure of above-mentioned electronic installation.For example, eNB10 may also include than figure
More either less components shown in 1 have the configuration different from shown in Fig. 1.
Memory 104 can be used for the software program and module of storage application software, such as present invention
Programmed instruction/module corresponding to cell switching method in embodiment, processor 102 pass through fortune
Row is stored in software program and module in memory 104, so as to perform various function application
And data processing, that is, realize above-mentioned method.Memory 104 may include high speed random storage
Device, may also include nonvolatile memory, as one or more magnetic storage device, flash memory,
Or other non-volatile solid state memories.In some instances, memory 104 can be further
Including that can pass through relative to the remotely located memory of processor 102, these remote memories
Network connection is to eNB10.The example of above-mentioned network includes but is not limited to internet, enterprises
Net, LAN, mobile radio communication and combinations thereof.
Transmitting device 106 is used to data are received or sent via a network.Above-mentioned network
Instantiation may include the wireless network that eNB10 communication providerses provide.In an example
In, transmitting device 106 include network adapter (Network Interface Controller,
NIC), it can be connected so as to be communicated with internet by base station with other network equipments.
In an example, transmitting device 106 can be radio frequency (Radio Frequency, RF) mould
Block, it is used to wirelessly be communicated with internet.
A kind of cell switching method for running on above-mentioned eNB is provided in the present embodiment, should
During user equipment (UE) switches over from source base station to target BS, Fig. 2 is root
According to a kind of flow chart of cell switching method of the embodiment of the present invention, as shown in Fig. 2 the flow
Comprise the following steps：
Step S202, source base station send radio resource control RRC connection reconfiguration to UE and disappeared
Breath；
Step S204, source base station send UE downlink data according to predetermined period to target BS
State report, wherein, downlink data state report is used under indicating that source base station transmits to UE
The state of row data.
By above-mentioned steps, source base station sends radio resource control RRC connection to UE and matched somebody with somebody again
After putting message, UE downlink data state report is sent to target BS according to predetermined period,
Wherein, downlink data state report is used to indicate source base station to the shape of the UE downlink datas transmitted
State, downlink data is transmitted between UE and source base station because source base station have sent to target BS
Downlink data state report, therefore target BS can know lower line numbers of the UE on source base station
According to transmission situation, so as to can timely continue to transmit after target BS establishes connection with UE
UE downlink data, avoids service disconnection, can solve in correlation technique UE from source base
There is the problem of service disconnection when being switched to target BS in station, has reached the effect of lifting Consumer's Experience
Fruit.
Alternatively, the executive agent of above-mentioned steps can be base station etc., but not limited to this.
Optionally, source base station to UE send wireless resource control connection reconfiguration message it
Afterwards, method also includes：The downlink data that source base station carries out UE to target BS forwards.That is,
Performing lower line number of the step S204 source base stations according to predetermined period to target BS transmission UE
During according to state report, the downlink data that source base station carries out UE to target BS forwards.
Optionally, UE downlink data is sent to target BS according to predetermined period in source base station
After state report, method also includes：Source base station receives the downlink data that target BS is sent
State report expiry notification, wherein, downlink data state report expiry notification is used in target base
When standing beginning to UE transmission downlink datas, instruction source base station stops sending downlink data state report
Accuse.
Optionally, the downlink data state report that target BS transmission is received in source base station stops leading to
After knowing, method also includes：
S11, source base station judge whether UE also has the downlink data not forwarded on source base station；
S12, if it is judged that being yes, continue the downlink data to target BS forwarding UE.
Optionally, downlink data state report passes through the first X2 application protocols (X2application
Protocol, referred to as X2AP) message transmission.Optionally, the first X2 application protocols disappear
Breath is new X2AP message.When being sent using new X2AP message, downlink data state
Report includes the universal land radio access web RAB (E-UTRAN with UE
Radio Access Bearer, referred to as E-RAB) related information.Specifically, and UE
The related information of E-RAB can be, but not limited to for：E-RAB marks, target BS are treated point
The descending protocol data unit PDU matched somebody with somebody PDCP (Packet Data
Convergence Protocol, referred to as PDCP) sequence number and Hyper Frame Number HFN, source base station
To UE first the PDCP SN and HFN for not sending the successful first descending PDU, first
The transmission state of the second descending PDU after descending PDU.
Optionally, downlink data state report forwards SN STATUS by serial-number-state
TRANSFER message is transmitted.Now, downlink data state report can be, but not limited to
For：The configured information of downlink data state report, the information related to UE E-RAB,
Wherein, the information related to UE E-RAB includes at least one of：Source base station is to UE
It is first the PDCP SN and HFN for not sending the successful first descending PDU, first descending
The transmission state of the second descending PDU after PDU.
Optionally, the present embodiment can use the second descending PDU of bit string expression hair
State is sent, wherein, 0 represents not send success, and 1 represents to have sent success, certainly, also may be used
To use other representations, e.g., 1 represents not send success, and 0 represents to have sent success.
Optionally, downlink data state report expiry notification is by the 2nd X2AP message sinks,
Wherein, downlink data state report expiry notification includes being used to stop sending downlink data state report
The instruction of announcement.Optionally, the 2nd X2AP message can be new X2AP message.
Optionally, downlink data state report expiry notification passes through UE CONTEXT
RELEASE message is transmitted, wherein, downlink data state report expiry notification includes using
In the instruction for stopping sending downlink data state report.
The cell switching method for running on above-mentioned eNB provided according to the present embodiment, can be with
Apply in target BS, apply and cut in user equipment (UE) from source base station to target BS
During changing, Fig. 3 is the flow of another cell switching method according to embodiments of the present invention
Figure, as shown in figure 3, the flow comprises the following steps：
Step S302, target BS receive the downlink data state report for the UE that source base station is sent,
Wherein, downlink data state report is used to indicate source base station to the shape of the UE downlink datas transmitted
State；
Step S304, target BS to UE when it is determined that send downlink data, according to lower line number
According to state report downlink data is sent to UE.
Optionally, when sending downlink data to UE according to downlink data state report, method
Also include：Target BS sends downlink data state report expiry notification to source base station, wherein,
Downlink data state report expiry notification is used to indicate that source base station stops sending downlink data state
Report.
Through the above description of the embodiments, those skilled in the art can be understood that
The mode of general hardware platform necessary to can add to the method according to above-described embodiment by software
To realize, naturally it is also possible to which by hardware, but the former is more preferably embodiment in many cases.
Based on such understanding, technical scheme substantially makes tribute to prior art in other words
The part offered can be embodied in the form of software product, and the computer software product is stored in
In one storage medium (such as ROM/RAM, magnetic disc, CD), including some instructions to
A so that station terminal equipment (can be mobile phone, computer, server, or network equipment etc.)
The method for performing each embodiment of the present invention.
Embodiment 2
A kind of cell switching device, system are additionally provided in the present embodiment, and the device is used for real
Existing above-described embodiment and preferred embodiment, had carried out repeating no more for explanation.It is such as following
Used, term " module " can realize the combination of the software and/or hardware of predetermined function.
Although device described by following examples is preferably realized with software, hardware, or
The realization of the combination of software and hardware is also what may and be contemplated.
Fig. 4 is a kind of structured flowchart of cell switching device according to embodiments of the present invention, application
User equipment (UE) from source base station into the source base station that target BS switches over, such as Fig. 4 institutes
Show, the device includes：
First sending module 40, match somebody with somebody again for sending radio resource control RRC connection to UE
Put message；
Second sending module 42, for sending the descending of UE to target BS according to predetermined period
Data status report, wherein, downlink data state report is used to indicate that source base station transmits to UE
Downlink data state.
Fig. 5 is the structured flowchart of another cell switching device according to embodiments of the present invention, should
Used in user equipment (UE) from source base station into the target BS that target BS switches over, such as scheme
Shown in 5, the device includes：
Receiving module 50, the downlink data state report of the UE for receiving source base station transmission,
Wherein, downlink data state report is used to indicate source base station to the shape of the UE downlink datas transmitted
State；
Sending module 52, for it is determined that to UE send downlink data when, according to downlink data
State report sends downlink data to UE.
Fig. 6 is the structured flowchart of cell handover system according to embodiments of the present invention, the system bag
Include：Source base station 60, target BS 62, UE64, wherein
Source base station 60, for sending radio resource control RRC connection reconfiguration to UE64
After message, UE64 downlink data state report is sent to target BS according to predetermined period,
Wherein, downlink data state report is used to indicate source base station to the UE64 downlink datas transmitted
State；
Target BS 62, the downlink data state report of the UE64 for receiving source base station transmission,
And when it is determined that sending downlink data to UE64, according to downlink data state report to UE64
Send downlink data.
It should be noted that above-mentioned modules can be realized by software or hardware,
For the latter, can be accomplished by the following way, but not limited to this：Above-mentioned module is respectively positioned on together
In one processor；Or the form of above-mentioned modules in any combination is respectively positioned at different
In processor.
Embodiment 3
The present embodiment is according to alternative embodiment of the present invention, for specific detailed to present invention progress
Explanation：
A kind of switching method of optimization is present embodiments provided, including：
In the mistake that UE switches over from source eNB cell-of-origin to target eNB Target cell
Cheng Zhong, after sending RRC Connection Reconfiguration message to UE in cell-of-origin,
Source eNB periodically sends the downlink data state report of the UE to target eNB, and opens
The downlink data for beginning to carry out the UE to target eNB forwards (Data forwarding).
Target eNB is when it is determined that Target cell can send downlink data to UE, mesh
ENB is marked according to downlink data the state report newest UE received from source eNB, is started
Downlink data is sent to UE, and the downlink data state report for sending to source eNB the UE is stopped
Only notify, but the downlink data forwarding times of the UE so continues (if now the UE exists
Source eNB also has if downlink data do not forward).
Optionally, downlink data state report, sent by new X2AP message, including this
Any one or more combinations of UE each related E-RAB following information：E-RAB
Mark, target eNB should not also have sequence number (Sequence Number, SN) to be next
Downlink service data unit (Service Data Unit, referred to as SDU) distribution PDCP
Sequence number and Hyper Frame Number (Hyper Frame Number, HFN), first do not send success
Descending PDU PDCP SN and HFN, represented with bit string first do not send out
Sending successful descending PDU follow-up descending PDU transmission state, (such as 0 represents not sending into
Work(, 1 represents to have sent success).
Optionally, downlink data state report, existing SN STATUS TRANSFER are utilized
Message is sent, including is only instruction (the Downlink Status of downlink data state report
Transfer Only), each related E-RAB of the UE following information any one or it is more
Individual combination：First does not send successful descending PDU PDCP SN and HFN, use
First follow-up descending PDU's for not sending successful descending PDU that bit string represents
Transmission state (such as 0 represents not send success, and 1 represents to have sent success).
Optionally, downlink data state report expiry notification, sent by new X2AP message,
Instruction including stopping sending downlink data state report.
Optionally, downlink data state report expiry notification, existing UE CONTEXT are utilized
RELEASE message is sent, including is only the instruction for stopping sending downlink data state report
(Stop Downlink Status Transfer Only)。
Fig. 7 is the switching method flow chart of according to embodiments of the present invention 3 optimization, such as Fig. 7 institutes
Show, this programme is illustrated with reference to Fig. 7 and two specific embodiment.
Specific embodiment 1
Step 1, source eNB determine UE being switched to target eNB from source eNB cell-of-origin
Target cell.Source eNB sends HANDOVER REQUEST message to target eNB.
Step 2, target eNB receive HANDOVER REQUEST message, target eNB
Agree to UE handover request, HANDOVER REQUEST are returned to source eNB
ACKNOWLEDGE message.
Step 3, source eNB receive HANDOVER REQUEST ACKNOWLEDGE
Message, determine that target eNB has agreed to UE handover request, source eNB by cell-of-origin to
UE sends RRC Connection Reconfiguration message.
Step 4, source eNB send the UE's by new X2AP message to target eNB
1st downlink data state report, include each related E-RAB of the UE following information：
E-RAB marks, target eNB should be next also without the descending of sequence number (SN)
SDU distribution PDCP sequence numbers and Hyper Frame Number (HFN), first do not send successfully under
Row PDU PDCP SN and HFN.
The downlink data that step 5, source eNB start to carry out UE to target eNB forwards.
Step 6, UE receive RRC Connection Reconfiguration message, according to disappearing
The configuration information carried in breath carries out the configuration of Radio Resource to UE, and UE was switching
The connection with source eNB is kept in journey as far as possible.
Step 7, source eNB send the UE's by new X2AP message to target eNB
2nd downlink data state report, include each related E-RAB of the UE following information：
E-RAB marks, target eNB should be next also without the descending of sequence number (SN)
SDU distribution PDCP sequence numbers and Hyper Frame Number (HFN), first do not send successfully under
Row PDU PDCP SN and HFN.
Step 8, UE and Target cell carry out random access procedure.
Step 9, source eNB send the UE's by new X2AP message to target eNB
3rd downlink data state report, include each related E-RAB of the UE following information：
E-RAB marks, target eNB should be next also without the descending of sequence number (SN)
SDU distribution PDCP sequence numbers and Hyper Frame Number (HFN), first do not send successfully under
Row PDU PDCP SN and HFN.
Step 10, target eNB are it is determined that Target cell can send downlink data to UE
When, target eNB is according to downlink data state the report newest UE received from source eNB
Accuse (i.e. the 3rd downlink data state report), start to send downlink data to the UE.
Step 11, target eNB are sent under UE by new X2AP message to source eNB
Row data status report expiry notification, including stop sending the downlink data state report of the UE
Instruction.
Step 12, UE send RRC Connection Reconfiguration to Target cell
Complete message.
After step 13, source eNB receive downlink data state report expiry notification, stop to mesh
Mark eNB sends the downlink data state report of the UE, but so continuation is appointed in downlink data forwarding
(if the now UE is if source eNB also has downlink data not forward).
Specific embodiment 2
Step 1, source eNB determine UE being switched to target eNB from source eNB cell-of-origin
Target cell.Source eNB sends HANDOVER REQUEST message to target eNB.
Step 2, target eNB receive HANDOVER REQUEST message, target eNB
Agree to UE handover request, HANDOVER REQUEST are returned to source eNB
ACKNOWLEDGE message.
Step 3, source eNB receive HANDOVER REQUEST ACKNOWLEDGE
Message, determine that target eNB has agreed to UE handover request, source eNB by cell-of-origin to
UE sends RRC Connection Reconfiguration message.
Step 4, source eNB are disappeared by the existing SN STATUS TRANSFER of X2 interface
Cease the 1st downlink data state report that the UE is sent to target eNB, including under being only
The instruction (Downlink Status Transfer Only) of row data status report, the UE it is each
Related E-RAB following information：First PDCP SN for not sending successful descending PDU
And HFN.
The downlink data that step 5, source eNB start to carry out UE to target eNB forwards.
Step 6, UE receive RRC Connection Reconfiguration message, according to disappearing
The configuration information carried in breath carries out the configuration of Radio Resource to UE, and UE was switching
The connection with source eNB is kept in journey as far as possible.
Step 7, source eNB are disappeared by the existing SN STATUS TRANSFER of X2 interface
Cease the 2nd downlink data state report that the UE is sent to target eNB, including under being only
The instruction (Downlink Status Transfer Only) of row data status report, the UE it is each
Related E-RAB following information：First PDCP SN for not sending successful descending PDU
And HFN.
Step 8, UE and Target cell carry out random access procedure.
Step 9, source eNB are disappeared by the existing SN STATUS TRANSFER of X2 interface
Cease the 3rd downlink data state report that the UE is sent to target eNB, including under being only
The instruction (Downlink Status Transfer Only) of row data status report, the UE it is each
Related E-RAB following information：First PDCP SN for not sending successful descending PDU
And HFN.
Step 10, target eNB are it is determined that Target cell can send downlink data to UE
When, target eNB is according to downlink data state the report newest UE received from source eNB
Accuse (i.e. the 3rd downlink data state report), according to comprising only downlink data state report
The instruction of announcement, the information that downlink data state report is related in message is only obtained, ignores other letters
Breath, and start to send downlink data to the UE.
Step 11, target eNB pass through the existing UE CONTEXT RELEASE of X2 interface
Message sends the downlink data state report expiry notification of the UE to source eNB, including is only
Stop sending instruction (the Stop Downlink Status Transfer of downlink data state report
Only)。
Step 12, UE send RRC Connection Reconfiguration to Target cell
Complete message.
Step 13, source eNB receive UE CONTEXT RELEASE message, according to comprising
Be only stop send downlink data state report instruction, only stop to target eNB send
The downlink data state report of the UE, other behaviors on source eNB do not influence.
Embodiment 4
Embodiments of the invention additionally provide a kind of storage medium.Alternatively, in the present embodiment,
Above-mentioned storage medium can be configured to the program code that storage is used to perform following steps：
S1, radio resource control RRC connection reconfiguration message is sent to UE；
S2, UE downlink data state report is sent to target BS according to predetermined period, its
In, downlink data state report is used to indicate source base station to the state of the UE downlink datas transmitted.
Alternatively, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk,
Read-only storage (ROM, Read-Only Memory), random access memory (RAM,
Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various to store
The medium of program code.
Alternatively, in the present embodiment, processor is according to the program generation stored in storage medium
Code performs to UE and sends radio resource control RRC connection reconfiguration message；
Alternatively, in the present embodiment, processor is according to the program generation stored in storage medium
Code performs the downlink data state report for sending UE to target BS according to predetermined period, wherein,
Downlink data state report is used to indicate source base station to the state of the UE downlink datas transmitted.
Alternatively, the specific example in the present embodiment may be referred to above-described embodiment and optional implementation
Example described in mode, the present embodiment will not be repeated here.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each
Step can realize that they can concentrate on single computing device with general computing device
On, or be distributed on the network that multiple computing devices are formed, alternatively, they can be used
The executable program code of computing device is realized, it is thus possible to be stored in storage dress
Performed in putting by computing device, and in some cases, can be with suitable different from herein
Sequence performs shown or described step, or they are fabricated to each integrated circuit die respectively
Block, or the multiple modules or step in them are fabricated to single integrated circuit module to realize.
So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
For those skilled in the art, the present invention can have various modifications and variations.It is all this
Within the spirit and principle of invention, any modification, equivalent substitution and improvements made etc. all should
Within protection scope of the present invention.
Claims (17)
1. a kind of cell switching method, apply in user equipment (UE) from source base station to mesh
During mark base station switches over, it is characterised in that including：
Source base station sends radio resource control RRC connection reconfiguration message to the UE；
The source base station is sent under the UE according to predetermined period to the target BS
Row data status report, wherein, the downlink data state report is used to indicate the source
State of the base station to the UE downlink datas transmitted.
2. according to the method for claim 1, it is characterised in that exist in source base station
After sending wireless resource control connection reconfiguration message to the UE, methods described is also
Including：The downlink data that the source base station carries out the UE to the target BS forwards.
3. according to the method for claim 1, it is characterised in that in the source base
Stand and send the downlink data state report of the UE to the target BS according to predetermined period
After reporting to, methods described also includes：
The source base station receives the downlink data state report that the target BS is sent and stopped
Only notify, wherein, the downlink data state report expiry notification is used in the target
When base station is started to UE transmission downlink datas, indicate that the source base station stops sending
The downlink data state report.
4. according to the method for claim 3, it is characterised in that in the source base station
It is described after receiving the downlink data state report expiry notification that the target BS is sent
Method also includes：
The source base station judges whether the UE also exists on the source base station and not forwarded
Downlink data；
If it is judged that being yes, continue to forward under the UE to the target BS
Row data.
5. according to the method for claim 1, it is characterised in that the lower line number
Sent according to state report by the first X2 application protocol messages.
6. according to the method for claim 5, it is characterised in that the lower line number
Include the universal land radio access web RAB with the UE according to state report
Information related E-RAB.
7. according to the method for claim 6, it is characterised in that with the UE
The related information of E-RAB include at least one of：E-RAB marks, the target
Base station descending protocol data unit PDU to be allocated PDCP PDCP
Sequence number and Hyper Frame Number HFN, the source base station do not send success to the UE first
The first descending PDU PDCP SN and HFN, after the first descending PDU
Second descending PDU transmission state.
8. according to the method for claim 1, it is characterised in that the lower line number
It is transmitted according to state report by SN STATUS TRANSFER message.
9. according to the method for claim 8, it is characterised in that the lower line number
Include at least one of according to state report：The configured information of downlink data state report,
The information related to the E-RAB of the UE, wherein, the E-RAB phases with the UE
The information of pass includes at least one of：The source base station is not sent out to the UE first
Send the successful first descending PDU PDCP SN and HFN, the first descending PDU
The transmission state of the second descending PDU afterwards.
10. the method according to claim 7 or 9, it is characterised in that use two
Second descending PDU transmission state described in system bits string representation, wherein, 0 represents not send out
Success is sent, 1 represents to have sent success.
11. according to the method for claim 3, it is characterised in that the lower line number
According to state report expiry notification by the 2nd X2AP message sinks, wherein, it is described descending
Data status report expiry notification includes being used to stop sending downlink data state report
Instruction.
12. according to the method for claim 3, it is characterised in that the lower line number
It is transmitted according to state report expiry notification by UE CONTEXT RELEASE message,
Wherein, the downlink data state report expiry notification includes being used to stop sending lower line number
According to the instruction of state report.
13. a kind of cell switching method, apply in user equipment (UE) from source base station to mesh
During mark base station switches over, it is characterised in that including：
Target BS receives the downlink data state report for the UE that source base station is sent, wherein,
The downlink data state report is used under indicating that the source base station transmits to the UE
The state of row data；
The target BS to the UE when it is determined that send downlink data, according to described
Downlink data state report sends downlink data to the UE.
14. according to the method for claim 13, it is characterised in that according to institute
When stating downlink data state report to UE transmission downlink datas, methods described is also wrapped
Include：
The target BS sends downlink data state report to the source base station to be stopped leading to
Know, wherein, the downlink data state report expiry notification is used to indicate the source base station
Stop sending the downlink data state report.
15. a kind of cell switching device, is applied in user equipment (UE) from source base station to mesh
In the source base station that mark base station switches over, it is characterised in that including：
First sending module, for sending radio resource control RRC connection to the UE
Reconfiguration message；
Second sending module, for according to described in predetermined period to target BS transmission
UE downlink data state report, wherein, the downlink data state report is used to indicate
State of the source base station to the UE downlink datas transmitted.
16. a kind of cell switching device, is applied in user equipment (UE) from source base station to mesh
In the target BS that mark base station switches over, it is characterised in that including：
Receiving module, the downlink data state report of the UE for receiving source base station transmission,
Wherein, the downlink data state report is used to indicate that the source base station passes to the UE
The state of defeated downlink data；
Sending module, for it is determined that to the UE send downlink data when, according to institute
State downlink data state report and send downlink data to the UE.
17. a kind of cell handover system, including source base station, target BS, UE, it is special
Sign is, wherein,
The source base station, for sending radio resource control RRC connection to the UE
After reconfiguration message, send the UE's to the target BS according to predetermined period
Downlink data state report, wherein, the downlink data state report is described for indicating
State of the source base station to the UE downlink datas transmitted；
The target BS, the downlink data state of the UE for receiving source base station transmission
Report, and when it is determined that sending downlink data to the UE, according to the downlink data
State report sends downlink data to the UE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610331548.3A CN107404738A (en) | 2016-05-18 | 2016-05-18 | Cell switching method, apparatus and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610331548.3A CN107404738A (en) | 2016-05-18 | 2016-05-18 | Cell switching method, apparatus and system |
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| CN201610331548.3A Pending CN107404738A (en) | 2016-05-18 | 2016-05-18 | Cell switching method, apparatus and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019105074A1 (en) * | 2017-11-29 | 2019-06-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for reestablishing rrc connection, terminal and storage medium |
| CN111556523A (en) * | 2019-02-12 | 2020-08-18 | 电信科学技术研究院有限公司 | Data transmission method and base station |
-
2016
- 2016-05-18 CN CN201610331548.3A patent/CN107404738A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019105074A1 (en) * | 2017-11-29 | 2019-06-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for reestablishing rrc connection, terminal and storage medium |
| CN111542053A (en) * | 2017-11-29 | 2020-08-14 | Oppo广东移动通信有限公司 | Method, terminal and storage medium for reestablishing RRC connection |
| RU2735411C1 (en) * | 2017-11-29 | 2020-11-02 | Гуандун Оппо Мобайл Телекоммьюникейшнз Корп., Лтд. | Method of restoring connection rrc, terminal device and data medium |
| US10932316B2 (en) | 2017-11-29 | 2021-02-23 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for reestablishing RRC connection, terminal and storage medium |
| CN111542053B (en) * | 2017-11-29 | 2022-07-08 | Oppo广东移动通信有限公司 | Method and terminal for reestablishing RRC connection |
| US11570835B2 (en) | 2017-11-29 | 2023-01-31 | Guangdong Oppo Mobile Telecommunications Corp. | Method for reestablishing RRC connection, terminal and storage medium |
| CN111556523A (en) * | 2019-02-12 | 2020-08-18 | 电信科学技术研究院有限公司 | Data transmission method and base station |
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