CN109526033A - A kind of method and apparatus switched over - Google Patents
A kind of method and apparatus switched over Download PDFInfo
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- CN109526033A CN109526033A CN201710848452.9A CN201710848452A CN109526033A CN 109526033 A CN109526033 A CN 109526033A CN 201710848452 A CN201710848452 A CN 201710848452A CN 109526033 A CN109526033 A CN 109526033A
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- 238000000034 method Methods 0.000 title claims abstract description 226
- 230000005540 biological transmission Effects 0.000 claims abstract description 145
- 230000008569 process Effects 0.000 claims abstract description 34
- 238000012545 processing Methods 0.000 claims description 44
- 238000004590 computer program Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 15
- 241000209094 Oryza Species 0.000 description 5
- 235000007164 Oryza sativa Nutrition 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
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- 235000009566 rice Nutrition 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000013475 authorization Methods 0.000 description 2
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Classifications
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
本发明公开了一种进行切换的方法与设备，用以解决现有技术中存在终端在基站间切换耗时长且数据传输中断时间长的问题。本发明实施例中，源基站分别向目标基站和终端发送进行传输的数据包信息。随后终端与目标基站进行随机接入过程，同时核心网开始进行路径切换，伴随随机接入过程进行终端与源基站的数据传输，最后目标基站与终端间开始数据传输。由于本发明实施例源基站分别向目标基站和终端发送进行传输的数据包信息，这样保证在终端进行随机接入过程的同时进行核心网路径切换过程，并在两个过程完成后根据数据包信息进行数据传输，从而减少了等待核心网路径切换的时间，可以使得终端与基站间的数据传输在终端进行切换后能够快速恢复。
The invention discloses a handover method and device, which are used to solve the problems in the prior art that the terminal takes a long time to switch between base stations and the data transmission interruption time is long. In the embodiment of the present invention, the source base station sends the data packet information for transmission to the target base station and the terminal respectively. Then the terminal and the target base station perform a random access process, and at the same time, the core network starts to perform path switching, accompanied by the random access process, data transmission between the terminal and the source base station, and finally data transmission between the target base station and the terminal starts. Since the source base station in the embodiment of the present invention sends the data packet information for transmission to the target base station and the terminal respectively, this ensures that the core network path switching process is performed while the terminal performs the random access process, and after the two processes are completed, according to the data packet information The data transmission is performed, thereby reducing the time for waiting for the core network path switching, which can enable the data transmission between the terminal and the base station to be quickly recovered after the terminal switches.
Description
Technical field
The present invention relates to wireless communication technology field, in particular to a kind of method and apparatus switched over.
Background technique
Wireless communication is that the characteristic that can be propagated in free space using electromagnetic wave signal carries out one kind of information exchange
Communication mode.The wireless communication realized on the move is commonly referred to as mobile communication again, and the two is collectively referred to as wireless mobile communications by people.
Switching in wireless mobile communications refers to that terminal (UE is referred to as user equipment) carries out letter between base station
When breath transmission, due to various reasons, needs to be transferred to the enterprising row information of channel that one is more suitable for from original channel used and pass
Defeated process.There are mainly two types of needing the reason of switching:
One is terminals when carrying out information transmission between base station, and terminal is moved to another from a wireless coverage cell
A wireless coverage cell needs to switch since original channel transmission quality used is too poor.In this case, judge channel
The foundation of quality can be received signal power, received signal to noise ratio and frame error rate etc..
When another kind is that terminal carries out information transmission between base station, among two radio coverages, system is
Balancing traffic and need to switch over currently used channel.
Currently, terminal first is completed to switch with target BS, then core when terminal switches in message transmitting procedure
Net can just start path being switched to target BS from source base station.There are when data transmission between terminal and base station before switching,
Switching starts, data transmission suspension, and switching is completed, and data transmission restores, since the time spent needed for switching is long, so data
The time of Transmission also can be long.
In conclusion terminal switches between base station in the presence of time-consuming in the prior art, data-transmission interruptions time length is asked
Topic.
Summary of the invention
The present invention provides a kind of method and apparatus switched over, to solve to exist in the prior art terminal between base station
The switching problem that time-consuming and the data-transmission interruptions time is long.
The embodiment of the present invention provides a kind of method switched over, this method comprises:
Source base station determines the target BS that terminal needs to switch；
The source base station will need to be sent to target by switching request message with the packet information that terminal is transmitted
Base station, and terminal is sent to by mobile control information, so that the target device carries out random access mistake in the terminal
Core network diameter handoff procedure is carried out while journey, and the terminal and the target BS is made to be existed according to the packet information
Carry out data transmission after the completion of the switching of core network diameter.
The embodiment of the present invention provides a kind of method switched over, this method comprises:
Target BS receives the packet information from source base station, wherein the packet information is the source base station needs
The packet information transmitted with terminal；
The target BS is after the feedback message for received data packet information for receiving terminal transmission, in the terminal
It carries out carrying out core network diameter handoff procedure while random access procedure；
The target BS switches in path to be completed, and after the completion of the random access procedure of the terminal,
The embodiment of the present invention provides a kind of method switched over, this method comprises:
Terminal receives the packet information from source base station, wherein the packet information is that the source base station needs and end
Hold the packet information transmitted；
The terminal sends the feedback message for being directed to received data packet information to target BS, so that the target BS
Core network diameter handoff procedure is carried out while the terminal carries out random access procedure；
The terminal is completed carrying out path switching, and after the completion of random access procedure, according to the packet information with
Target BS terminal carries out data transmission.
The embodiment of the present invention provides a kind of source base station switched over, comprising: processor and transceiver:
The processor for carrying out data transmission by transceiver, and determines the target BS that terminal needs to switch；It will
It needs the packet information transmitted with terminal to be sent to target BS by switching request message, and passes through mobile control
Information is sent to terminal, so that the target device carries out core net path while the terminal carries out random access procedure
Handoff procedure, and make the terminal and the target BS according to the packet information core network diameter switch after the completion of into
The transmission of row data.
The embodiment of the present invention provides a kind of target BS switched over, comprising: processor and transceiver:
The processor for carrying out data transmission by transceiver, and receives the packet information from source base station,
Described in packet information be packet information that the source base station needs to be transmitted with terminal；In the needle for receiving terminal transmission
After the feedback message for receiving packet information, core network quarter sawing is carried out while the terminal carries out random access procedure
Change process；Switch in path and complete, and after the completion of the random access procedure of the terminal, according to the packet information with it is described
Terminal carries out data transmission.
The embodiment of the present invention provides a kind of terminal switched over, comprising: processor and transceiver:
The processor for carrying out data transmission by transceiver, and receives the packet information from source base station,
Described in packet information be packet information that the source base station needs to be transmitted with terminal；It is directed to target BS transmission
The feedback message of received data packet information, so that the target BS the terminal carry out random access procedure while into
Row core network diameter handoff procedure；It completes carrying out path switching, and after the completion of random access procedure, is believed according to the data packet
Breath carries out data transmission with target BS terminal.
The embodiment of the present invention provides a kind of source base station switched over, the equipment include: at least one processing unit and
At least one storage unit, wherein the storage unit is stored with program code, when said program code is by the processing unit
When execution, so that the processing unit executes following process:
Determine the target BS that terminal needs to switch；The packet information transmitted with terminal will be needed to ask by switching
It asks message to be sent to target BS, and terminal is sent to by mobile control information, so that the target device is at the end
End carry out random access procedure while carry out core network diameter handoff procedure, and make the terminal and the target BS according to
The packet information carries out data transmission after the completion of core network diameter switches.
The embodiment of the present invention provides a kind of target BS switched over, the equipment include: at least one processing unit with
And at least one storage unit, wherein the storage unit is stored with program code, when said program code is single by the processing
When member executes, so that the processing unit executes following process:
Receive the packet information from source base station, wherein the packet information be the source base station need and terminal into
The packet information of row transmission；After the feedback message for received data packet information for receiving terminal transmission, in the terminal
It carries out carrying out core network diameter handoff procedure while random access procedure；Switch in path and complete, and the terminal is random
After the completion of access procedure, carried out data transmission according to the packet information and the terminal.
The embodiment of the present invention provides a kind of terminal switched over, which includes: at least one processing unit and extremely
A few storage unit, wherein the storage unit is stored with program code, when said program code is held by the processing unit
When row, so that the processing unit executes following process:
Receive the packet information from source base station, wherein the packet information be the source base station need and terminal into
The packet information of row transmission；The feedback message for being directed to received data packet information is sent to target BS, so that the target
Base station carries out core network diameter handoff procedure while the terminal carries out random access procedure；Switch carrying out path
At, and after the completion of random access procedure, carried out data transmission according to the packet information and target BS terminal.
In the embodiment of the present invention, source base station sends the packet information transmitted to target BS and terminal respectively.Eventually
It terminates and sends feedback information to target BS after receiving the packet information that source base station sends over, switched carrying out path
At, and after the completion of random access procedure, carried out data transmission according to the packet information and target BS terminal.Target BS
After the feedback message for received data packet information for receiving terminal transmission, the same of random access procedure is carried out in the terminal
Shi Jinhang core network diameter handoff procedure；Switch in path and complete, and after the completion of the random access procedure of the terminal, according to institute
Packet information is stated to carry out data transmission with the terminal.Since source base station of the embodiment of the present invention is respectively to target BS and terminal
The packet information transmitted is sent, guarantees to carry out core network while the terminal carries out random access procedure in this way
Diameter handoff procedure, and carried out data transmission after the completion of two processes according to packet information, to reduce waiting core net
The time of path switching, the data between terminal and base station can be made to transmit being capable of fast quick-recovery after terminal switches over.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of system flow schematic diagram for switching over method of the embodiment of the present invention；
For the embodiment of the present invention, the first switches over the flow diagram of method to Fig. 2；
Fig. 3 is second of the embodiment of the present invention flow diagram for switching over method；
For the embodiment of the present invention, the third switches over the flow diagram of method to Fig. 4；
Fig. 5 is the structural schematic diagram of the first source base station switched over of the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the first target BS switched over of the embodiment of the present invention；
Fig. 7 is the structural schematic diagram of the first terminal switched over of the embodiment of the present invention；
Fig. 8 is the structural schematic diagram of second of the embodiment of the present invention source base station switched over；
Fig. 9 is the structural schematic diagram of second of the embodiment of the present invention target BS switched over；
Figure 10 is the structural schematic diagram of second of the embodiment of the present invention terminal switched over；
Figure 11 is a kind of complete method flow diagram for switching over method of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that the described embodiments are only some of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
As described in Figure 1, the system that the embodiment of the present invention switches over includes:
Source base station 100, the target BS for needing to switch for determining terminal；The data packet that will need to transmit with terminal
Information is sent to target BS by switching request message, and is sent to terminal by mobile control information, so that the mesh
Marking device carries out core network diameter handoff procedure while the terminal carries out random access procedure, and makes the terminal and institute
It states target BS and is carried out data transmission after the completion of core network diameter switches according to the packet information.
Target BS 101, for receiving the packet information from source base station, wherein the packet information is the source
Base station needs the packet information transmitted with terminal；Disappear in the feedback for received data packet information for receiving terminal transmission
After breath, core network diameter handoff procedure is carried out while the terminal carries out random access procedure；Switch in path and completes, and
After the completion of the random access procedure of the terminal, carried out data transmission according to the packet information and the terminal.
Terminal 102, for receiving the packet information from source base station, wherein the packet information is the source base station
Need the packet information transmitted with terminal；The feedback message for being directed to received data packet information is sent to target BS,
So that the target BS carries out core network diameter handoff procedure while the terminal carries out random access procedure；Carry out
Path switching is completed, and after the completion of random access procedure, carries out data biography according to the packet information and target BS terminal
It is defeated.
In the embodiment of the present invention, source base station sends the packet information transmitted to target BS and terminal respectively.Eventually
It terminates and sends feedback information to target BS after receiving the packet information that source base station sends over, switched carrying out path
At, and after the completion of random access procedure, carried out data transmission according to the packet information and target BS terminal.Target BS
After the feedback message for received data packet information for receiving terminal transmission, the same of random access procedure is carried out in the terminal
Shi Jinhang core network diameter handoff procedure；Switch in path and complete, and after the completion of the random access procedure of the terminal, according to institute
Packet information is stated to carry out data transmission with the terminal.Since source base station of the embodiment of the present invention is respectively to target BS and terminal
The packet information transmitted is sent, guarantees to carry out core network while the terminal carries out random access procedure in this way
Diameter handoff procedure, and carried out data transmission after the completion of two processes according to packet information, to reduce waiting core net
The time of path switching, the data between terminal and base station can be made to transmit being capable of fast quick-recovery after terminal switches over.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Sequence SN (sequence number, sequence number) number.
In the embodiment of the present invention, when switching, source base station is by the last one that be transmitted between source base station and terminal
Sequence SN of allocation of packets issues terminal and target BS, specific to inform that terminal source base station interacts most with terminal room
The generic sequence number of the latter data packet, so it is known that the position of the data transfer ends of source base station and terminal, Yi Ji
Core net and the transmission of the data of target BS will be opened from the data packet of which generic sequence number after the completion of the switching of core network diameter
Begin to transmit, while being also known that the suitable of the data packet for starting transmission between terminal and target BS after the switching of core network diameter
Sequence sequence number.
For example, source base station is carrying out data transmission with terminal, target BS has been determined for source base station and measure will be the 500th
A data packet carries out the switching between terminal and base station after being transmitted, in this way, source base station can will will pass between source base station and terminal
Sequence No. SN 500 of the last one defeated allocation of packets sends terminal and target BS to.
Wherein, sequence number is the transmission package number mode based on a kind of connection-oriented Apple talk Data Stream Protocol Apple Ta, it guarantees
The sequence of transmission data packet, by checking that sequence number can determine whether data transmission is out-of-order.
Processing feature is faced in conjunction with protocol stack data, the SN that data packet uses is most preferably PDCD (Packet Data
Convergence Protocol, Packet Data Convergence Protocol) PDU (Protocol Data Unit, protocol Data Unit)
SN.The sequence SN of the last one that be transmitted allocation of packets and source base station and terminal between specific source base station and terminal
Between the value of the generic sequence number of first allocation of packets that will transmit can be according to the realization self-defining of system.
Optionally, the packet information can also include but is not limited to some or all of in following message:
1, the generic sequence number for first allocation of packets that will be transmitted between source base station and terminal；
2, data packet reception state inquiry request indicates information；
3, terminal carry out random access procedure in source base station carry out data transmission using TDM (Time Division
Multiplex, time division multiplexing transmitting-receiving) mode.
Wherein, 1: the generic sequence number for first allocation of packets that will be transmitted between source base station and terminal is source base station
After measurement monitors and determines that target is fought fiercely, the sequence number of the data packet carried out data transmission with terminal will be continued.
2: data packet reception state inquiry request instruction information is Polling (poll) instruction.
Poll is how a kind of CPU (Central Processing Unit, central processing unit) decision provides peripheral equipment
The mode of service, also known as program-controlled import and export.When poll, processor timing successively inquires whether each peripheral equipment needs to take
Business, needs, gives and service, next equipment is inquired again after service, then constantly in cycles.
It include monitoring data of the terminal to the data packet downloaded in downlink path, terminal in Polling instruction herein
Successively the data packet of downloading is inquired, confirms it with the presence or absence of data packet transmission failure, situations such as error of transmission, and by phase
The data packet transmission situation answered indicates that information feeds back to source base station by data packet reception state inquiry request, and such source base station can
To indicate that information timely knows the state of data packet transmission according to data packet reception state inquiry request.Source base station again will letter
Breath transmits the target BS and terminal, after the completion of the switching of core network diameter, terminal and target BS are intervened at random, target base
It stands and starts data transmission with terminal, then lost according to the data packet reception state inquiry request instruction information of source base station transmission
The accidentally re-transmission of data.
3: terminal carry out in random access procedure carrying out data transmission with source base station using TDM mode be exactly the time-division it is multiple
Use mode.
Time division multiplexing refers to a kind of intersection digit pulse by different channels or time slot, while in the same communication medium
The upper technology for transmitting multiple digitalized datas, voice and video signal etc..For time division multiplex system, the time of the whole network is same
Step be it is critically important, otherwise cannot accurately transmit information.
It is to increase TDM in RACH-ConfigDedicated (random access procedure specialized configuration) in the embodiment of the present invention
When eat dishes without rice or wine using RACH (Random Access Channel, random access channel) channel mode, to ensure that terminal can
The transmitting-receiving of TDM is realized between source carrier wave and purpose carrier wave.
In the embodiment of the present invention, source base station sends the packet information of terminal in addition to be transmitted between source base station and terminal
The sequence SN extra of the last one allocation of packets can also have first data packet that will be transmitted between source base station and terminal
The generic sequence number of distribution so can make system preferably and be the transmission of the data of source base station and terminal room to reserve transmission hair
Send window space.In addition, packet information further includes data packet reception state inquiry request instruction information, this information is mainly used for
When downlink path, data packet reception state inquiry request instruction information is simultaneously transferred to source base station, source base by terminal downloads data packet
It stands and these data packet reception state inquiry requests instruction information is transferred to target BS again, so that target BS transmits data
The packet retransmission of failure is to terminal.It is carried out in random access procedure in terminal, the data transmission of terminal and source base station makes
TDM mode can make terminal while carrying out random access procedure between processing and source base station with TDM mode
Data transmission does not need interrupt latency switching and completes.
The packet information that source base station is sent to target BS can also be containing will transmit between source base station and terminal
The generic sequence of first allocation of packets SN, in conjunction with the last one that be transmitted between source base station and terminal allocation of packets
Generic sequence SN, be apparent that the accurate data packet number that source base station and terminal room need to transmit, so may be used
Think that the transmission of these data packets reserves enough data transmission and sends window space.If only between source base station and terminal
The generic sequence of the last one that be transmitted allocation of packets SN, when source base station and terminal room carry out data transmission, only
It can know that the transmission of the data between source base station and terminal will wherein terminate according to obtained information, without knowing source base station and terminal
Between the data packet number that specifically needs to transmit.
Such as: this time transmission should transmit 100 data packets, when source base station and terminal are transmitted to the 5th data packet, data packet
Transmission failure, at this point, terminal will send the information of the 5th data packet transmission failure to source base station.Wherein, the 5th data packet
The information of transmission failure can be described as data packet reception state inquiry request instruction information.
Below by RACH-ConfigDedicated increase TDM when eat dishes without rice or wine using RACH channel mode for carry out
Explanation.
In ra-HO-TDMModelndex (Radio Access-Handover-TDM Mode Index, random access
Time division multiplexing index) definition, according to PRACH, (Physical Random Access Channel, physical accidental are connect
Enter channel) in the format of molecule frame and Preamble (random access preamble) code eated dishes without rice or wine.
For example, the radio frames of a 10ms, wireless sub-frame are encoded to 0~9, wherein there is 2 wireless sub-frames can be used as
The transmission of PRACH progress random access procedure information.When terminal switches between base station, it can use the two wireless sons
As PRACH, the information of the random process transmission of all terminals and target BS all passes through the two wireless sub-frames and passes through, other
It is not engaged in the data transmission that source base station and terminal room are carried out in the wireless sub-frame of random access procedure.
Optionally, source base station will need to be sent to mesh by switching request message with the packet information that terminal is transmitted
Base station is marked, and after being sent to terminal by mobile control information, is connect at random in the terminal and the target BS
During entering, carried out data transmission by the not used running time-frequency resource of random access procedure with the terminal.
Correspondingly, terminal passes through in carrying out random access procedure after receiving the packet information from source base station
The not used running time-frequency resource of random access procedure carries out data transmission with the source base station.
In the embodiment of the present invention, source base station is after being sent respectively to terminal and target BS for packet information, terminal
Enter random access procedure with target BS.At this point, there is no pauses for the data transmission between terminal and source base station, but utilize
The wireless sub-frame that do not use in the radio frames frame of random access procedure specialized configuration carries out the transmission of data.So can with
It persistently keeps the data between source base station and terminal to transmit in machine access procedure, saves the resource of system.
Below by RACH-ConfigDedicated increase TDM when eat dishes without rice or wine using RACH channel mode for carry out
Explanation.
In the definition of ra-HO-TDMModelndex, according to PRACH in the molecule frame eated dishes without rice or wine and the format of Preamble code.
For example, the radio frames of a 10ms, wireless sub-frame are encoded to 0~9, wherein there is 2 wireless sub-frames can be used as
The transmission of PRACH progress random access procedure information.When terminal switches between base station, it is wireless to can choose one of them
Subframe is fixed as PRACH, and the information of the random process transmission of all terminals and target BS is all logical from this wireless sub-frame
It crosses, it is other to be not engaged in the data transmission that source base station and terminal room are carried out in the wireless sub-frame of random access procedure.
For example wireless sub-frame 3 is selected to carry out the letter that terminal and target BS random access procedure information are transmitted as PRACH
Road.At this point, when reaching wireless sub-frame 3, terminal just carries out the related letter of random access to target BS often by a radio frames
The transmission of breath then carries out data transmission between terminal and source base station when other wireless sub-frames reach, i.e. arrival wireless sub-frame 0
When~2,4~9, carry out data transmission between terminal and source base station.
Optionally, source base station sends out some or all of caching data packet after completing to re-establish the data processing of process
Target BS is given, so that the target BS is when needing to retransmit, according to the packet information and the data received
Packet is retransmitted.
Correspondingly, target BS after re-establishing the data processing of process with source base station completion, receives the source base station hair
The data packet sent；When needing to retransmit, retransmitted according to the packet information and the data packet received.
In the embodiment of the present invention, terminal can be by data packet reception state inquiry request instruction information hair after downloading data packet
Source base station is given, source base station is indicating information by the data packet of corresponding transmission failure according to data packet reception state inquiry request
It sends target BS to, so that target BS can accurately retransmit the data packet of transmission failure, so can be good at guaranteeing
The accuracy of data transmission.
For example, this time transmission should transmit 5000 data packets, it, will when source base station and terminal are transmitted to the 500th data packet
It switches.In preceding 500 data packets, the 30th, 59,275 data packet transmission failure, terminal is that source base station is transmitted
When, the corresponding data packet reception state inquiry request instruction information of the 30th, 59,275 data packet transmission failure can be sent to
Source base station.After source base station receives information, then by corresponding data packet reception state inquiry request instruction information be sent to target base
Stand and terminal, while the 30th, 59,275 data packet can be also sent to target BS by source base station, so as to target BS according to
Corresponding data packet reception state inquiry request indicates that the 30th, 59,275 data packet of transmission failure is retransmitted to end by information
End.
Optionally, terminal carries out data transmission it by the not used running time-frequency resource of random access procedure and the source base station
Afterwards, it is separated from the source base station and carries out data transmit-receive on target BS.
In the embodiment of the present invention, after the completion of the random access procedure of target BS and terminal room, and and target BS
Data transmission between source base station is still continuing, after the data that should be transmitted all between terminal and source base station have all transmitted,
Terminal can just separate with source base station and carry out data transmit-receive on target BS, in this way, can be very good to guarantee the complete of data transmission
Whole property.
Wherein, the quantity for needing the time spent to have the required data packet transmitted is said in the data transmission between terminal and source base station
It determines.At the end of after random process and core net path integration, data transmission may be between terminal and source base station,
Also it may also continue to transmit.And terminal is separated with source base station after must waiting until that all data packets for answering high-transmission are all transmitted
Just it is able to achieve.At the same time, terminal carries out data transmit-receive and needs only assure that meet between terminal and source base station on target BS
Random access procedure is completed, and core net path is converted into the two conditions of function.
Terminal carries out the mode of data transmit-receive on target BS target BS, and there are two types of may situation:
One, the data of source base station and terminal room be transmitted the time earlier than the random access procedure between terminal and source base station with
And the deadline of core net path integration:
At this point, terminal could be in target BS after only random access procedure and core net path being waited to convert
Upper carry out data transmit-receive.
Two, when the data of source base station and terminal room are transmitted the random access procedure that the time is later than between terminal and source base station
And the deadline of core net path integration:
Mode one:
The data that terminal waits the data of source base station and terminal room to be carried out again between target BS after being transmitted are transmitted；
Mode two:
The data that terminal is carried out while the data of source base station and terminal room are transmitted between terminal and target BS are transmitted, etc.
It is ranked up again by terminal log according to the generic sequence number of packet after being all transmitted to all data packets.
Based on the same inventive concept, a kind of method switched over is additionally provided in the embodiment of the present invention, due to this method
Corresponding equipment is source base station, target BS and terminal in the embodiment of the present invention, and the principle that this method solves the problems, such as
It is similar to the system, therefore the implementation of this method may refer to the implementation of system, overlaps will not be repeated.
As shown in Fig. 2, the embodiment of the present invention provides a kind of method switched over, this method comprises:
Step 200: source base station determines the target BS that terminal needs to switch；
Step 201: source base station will need the packet information transmitted with terminal to be sent to by switching request message
Target BS, and terminal is sent to by mobile control information, so that the target device is connect at random in the terminal
Core network diameter handoff procedure is carried out while entering process, and believes that the terminal and the target BS according to the data packet
Breath carries out data transmission after the completion of the switching of core network diameter.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Sequence SN.
Optionally, the packet information further includes some or all of in following message:
The generic sequence number for first allocation of packets that will be transmitted between source base station and terminal；
Data packet reception state inquiry request indicates information；
Terminal carry out random access procedure in source base station carry out data transmission using time division multiplexing receive and dispatch TDM mould
Formula.
Optionally, the source base station will need the packet information transmitted with terminal to send by switching request message
It is sent to after terminal to target BS, and by mobile control information, further includes:
The source base station carries out passing through random access procedure in random access procedure in the terminal and the target BS
Not used running time-frequency resource carries out data transmission with the terminal.
Optionally, the source base station is after completing to re-establish the data processing of process, by some or all of caching data
Packet is sent to target BS so that the target BS is when needing to retransmit, according to the packet information and receive described in
Data packet is retransmitted.
As shown in figure 3, the embodiment of the present invention provides a kind of method switched over, this method comprises:
Step 300: target BS receives the packet information from source base station, wherein the packet information is the source
Base station needs the packet information transmitted with terminal；
Step 301: target BS is after the feedback message for received data packet information for receiving terminal transmission, described
Terminal carries out carrying out core network diameter handoff procedure while random access procedure；
Step 302: target BS switches in path to be completed, and after the completion of the random access procedure of the terminal, according to institute
Packet information is stated to carry out data transmission with the terminal.
Optionally, the target BS receives the source base after re-establishing the data processing of process with source base station completion
Stand send data packet；
The target BS carries out weight when needing to retransmit, according to the packet information and the data packet received
It passes.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Generic sequence number.
As shown in figure 4, the embodiment of the present invention provides a kind of method switched over, this method comprises:
Step 400: terminal receives the packet information from source base station, wherein the packet information is the source base station
Need the packet information transmitted with terminal；
Step 401: terminal sends the feedback message for being directed to received data packet information to target BS, so that the target
Base station carries out core network diameter handoff procedure while the terminal carries out random access procedure；
Step 402: terminal is carrying out path switching completion, and after the completion of random access procedure, is believed according to the data packet
Breath carries out data transmission with target BS terminal.
Optionally, after the packet information of the terminal reception from source base station, further includes:
The terminal passes through the not used running time-frequency resource of random access procedure and the source in carrying out random access procedure
Base station carries out data transmission.
Optionally, the terminal carries out data biography by the not used running time-frequency resource of random access procedure and the source base station
After defeated, separated from the source base station and carry out data transmit-receive on target BS.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Generic sequence number.
As shown in figure 5, the embodiment of the present invention provides a kind of source base station switched over, comprising: processor 500 and transmitting-receiving
Machine 501:
The processor 500 for carrying out data transmission by transceiver, and determines the target base that terminal needs to switch
It stands；It will need to be sent to target BS by switching request message with the packet information that terminal is transmitted, and pass through shifting
Dynamic control information is sent to terminal, so that the target device carries out core while the terminal carries out random access procedure
Network diameter handoff procedure, and switched the terminal and the target BS in core network diameter according to the packet information
Carry out data transmission after.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Sequence SN.
Optionally, the packet information further includes some or all of in following message:
The generic sequence number for first allocation of packets that will be transmitted between source base station and terminal；
Data packet reception state inquiry request indicates information；
Terminal carry out random access procedure in source base station carry out data transmission using time division multiplexing receive and dispatch TDM mould
Formula.
Optionally, the processor 500 is also used to:
The packet information transmitted with terminal will needed to be sent to target BS by switching request message, and
After being sent to terminal by mobile control information, carries out in random access procedure, lead in the terminal and the target BS
The not used running time-frequency resource of random access procedure is crossed to carry out data transmission with the terminal.
Optionally, the processor 500 is also used to:
After completing to re-establish the data processing of process, some or all of caching data packet is sent to target BS,
So that the target BS when needing to retransmit, is retransmitted according to the packet information and the data packet received.
As shown in fig. 6, the embodiment of the present invention provides a kind of target BS switched over, comprising: processor 600 and receipts
Hair machine 601:
The processor 600 for carrying out data transmission by transceiver, and receives the data packet letter from source base station
Breath, wherein the packet information is the packet information that the source base station needs to be transmitted with terminal；Receiving terminal hair
After the feedback message for received data packet information sent, core net is carried out while the terminal carries out random access procedure
Path handoff procedure；Switch in path and complete, and after the completion of the random access procedure of the terminal, according to the packet information
Carry out data transmission with the terminal.
Optionally, the processor 600 is also used to:
After re-establishing the data processing of process with source base station completion, the data packet that the source base station is sent is received；
When needing to retransmit, retransmitted according to the packet information and the data packet received.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Generic sequence number.
As shown in fig. 7, the embodiment of the present invention provides a kind of terminal switched over, comprising: processor 700 and transceiver
701:
The processor 700 for carrying out data transmission by transceiver, and receives the data packet letter from source base station
Breath, wherein the packet information is the packet information that the source base station needs to be transmitted with terminal；It is sent out to target BS
The feedback message for received data packet information is sent, so that the target BS carries out random access procedure in the terminal
Core network diameter handoff procedure is carried out simultaneously；It is completed carrying out path switching, and after the completion of random access procedure, according to the number
Carry out data transmission according to package informatin and target BS terminal.
Optionally, the processor 700 is also used to:
After receiving the packet information from source base station, carry out passing through random access procedure in random access procedure
Not used running time-frequency resource carries out data transmission with the source base station.
Optionally, the processor 700 is also used to:
After being carried out data transmission by the not used running time-frequency resource of random access procedure and the source base station, from the source
Base station separates and carries out data transmit-receive on target BS.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Generic sequence number.
As shown in figure 8, the second provided in an embodiment of the present invention source base station switched over, which includes: at least one
A processing unit 800 and at least one storage unit 801, wherein the storage unit is stored with program code, when the journey
When sequence code is executed by the processing unit, so that the processing unit executes following process:
Determine the target BS that terminal needs to switch；The packet information transmitted with terminal will be needed to ask by switching
It asks message to be sent to target BS, and terminal is sent to by mobile control information, so that the target device is at the end
End carry out random access procedure while carry out core network diameter handoff procedure, and make the terminal and the target BS according to
The packet information carries out data transmission after the completion of core network diameter switches.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Sequence SN.
Optionally, the packet information further includes some or all of in following message:
The generic sequence number for first allocation of packets that will be transmitted between source base station and terminal；
Data packet reception state inquiry request indicates information；
Terminal carry out random access procedure in source base station carry out data transmission using time division multiplexing receive and dispatch TDM mould
Formula.
Optionally, the processing unit 800 is also used to:
The packet information transmitted with terminal will needed to be sent to target BS by switching request message, and
After being sent to terminal by mobile control information, carries out in random access procedure, lead in the terminal and the target BS
The not used running time-frequency resource of random access procedure is crossed to carry out data transmission with the terminal.
Optionally, the processing unit 800 is also used to:
After completing to re-establish the data processing of process, some or all of caching data packet is sent to target BS,
So that the target BS when needing to retransmit, is retransmitted according to the packet information and the data packet received.
As shown in figure 9, the second provided in an embodiment of the present invention target BS switched over, the equipment include: at least
One processing unit 900 and at least one storage unit 901, wherein the storage unit is stored with program code, when described
When program code is executed by the processing unit, so that the processing unit executes following process:
Receive the packet information from source base station, wherein the packet information be the source base station need and terminal into
The packet information of row transmission；After the feedback message for received data packet information for receiving terminal transmission, in the terminal
It carries out carrying out core network diameter handoff procedure while random access procedure；Switch in path and complete, and the terminal is random
After the completion of access procedure, carried out data transmission according to the packet information and the terminal.
Optionally, the processing unit 900 is also used to:
After re-establishing the data processing of process with source base station completion, the data packet that the source base station is sent is received；It is needing
When retransmitting, retransmitted according to the packet information and the data packet received.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Generic sequence number.
As shown in Figure 10, the second provided in an embodiment of the present invention terminal switched over, the equipment include: at least one
Processing unit 1000 and at least one storage unit 1001, wherein the storage unit is stored with program code, when the journey
When sequence code is executed by the processing unit, so that the processing unit executes following process:
Receive the packet information from source base station, wherein the packet information be the source base station need and terminal into
The packet information of row transmission；The feedback message for being directed to received data packet information is sent to target BS, so that the target
Base station carries out core network diameter handoff procedure while the terminal carries out random access procedure；Switch carrying out path
At, and after the completion of random access procedure, carried out data transmission according to the packet information and target BS terminal.
Optionally, the processing unit 1000 is also used to:
After receiving the packet information from source base station, carry out passing through random access procedure in random access procedure
Not used running time-frequency resource carries out data transmission with the source base station.
Optionally, the processing unit 1000 is also used to:
After being carried out data transmission by the not used running time-frequency resource of random access procedure and the source base station, from the source
Base station separates and carries out data transmit-receive on target BS.
Optionally, the packet information includes the last one that be transmitted between source base station and terminal allocation of packets
Generic sequence number.
The embodiment of the invention provides a kind of computer can storage medium, be stored thereon with computer program, the program quilt
The step of method method of the step of method of the step or Fig. 3 in the method for Fig. 2 is realized when processor execution or Fig. 4.
As shown in figure 11, a kind of detailed process of method switched over provided in an embodiment of the present invention is as follows:
Step 1100: source base station, purpose base station and core net carry out region limitation and are arranged；(Area Restriction
Provided)
Step 1101: source base station carries out observing and controlling to terminal；(Measurement Control)
Step 1102: being grouped data between terminal and source base station, source base station and core net；(Packet data)
Step 1103: source base station terminal sends uplink authorization instruction；(Uplink allocation)
Step 1104: source base station obtains the measurement report of terminal；(Measurement Report)
Step 1105: source base station switches over judgement；(Handover decision)
Step 1106: source base station issues switching request to target BS；(Handover Request)
Step 1107: for target BS after receiving switching request, confirmation receives control；(Admission Control)
Step 1108: target BS issues switching request response to source base station；(Handover Request Ack)
Step 1109: terminal sends downlink distribution to source base station；(downlink allocation)
Step 1110: RRC (Radio Resource Control, wireless heterogeneous networks) connection weight between terminal and source base station
Configuration；(RRC Conn.Reconf.incl.mobility Controlinformation)
Step 1111: terminal sends the feedback information for being directed to received data packet information to target BS；
Step 1112A: source base station transmits buffering and transmission data packet to target BS；(Deliver buffered and
in transit packets to target eNB)
Step 1113A: source base station is to target BS transfer sequence state；(SN Status Transfer)
Step 1114A: source base station carries out data to target BS forward；(Data Forwarding)
Step 1115A: data are grouped between core net and target BS；(packet data)
Step 1116A: target BS is to core net transmitting path switching request；(path Switch Request)
Step 1117A: core net network node sends modification carrying response to service/Service Gateway；(Modify
Bearer Request)
Step 1118A: Core Network Service/Service Gateway carries out downlink path switching；(Switch Downlink patch)
Step 1119A: core net is sent to source base station terminates label；(End Marker)
Step 1120A: core net is grouped data；(packet data)
Step 1121A: Core Network Service/Service Gateway feeds back modification to network node and accepts response；(Modify
Bearer Request)
Step 1122A: core net issues the instruction of data Handover Request Acknowledge to target BS；(path Switch
Request Ack)
Step 1123A: target BS buffers the data packet from source base station；(buffer packets form source
eNB)
Step 1112B: source base station and the time division multiplexing of terminal synchronize；(synchronisation)
Step 1113B: target BS sends uplink authorization instruction to terminal and target BS is synchronous with terminal time；
(Uplink allocation+Time Alignment for UE)
Step 1114B: terminal issues RRC connection reconfiguration to target BS and sets completion instruction；(RRC
Conn.Reconf.complete)
Step 1115B: target BS packet data；(packet data)
Step 1124: source base station is sent to target BS terminates label；(End Marder)
Step 1125: target BS sends the release of UE (User Equipment, user equipment) context to source base station and refers to
It enables；(UE Context Release)
Step 1126: terminal is from old residential area attachment removal and is synchronized to new cell；(Detach form old cell and
synchronize to new cell)
Step 1127: source base station discharges resource.(Release Resources)
Wherein, step 1112A~1123A is accomplished that the path between core net and base station switches, step 1112B~
1115B is accomplished that the random access procedure between terminal and target BS, the generation of the two processes in no particular order, while into
Row.
Above by reference to showing according to the method, apparatus (system) of the embodiment of the present application and/or the frame of computer program product
Figure and/or flow chart describe the application.It should be understood that can realize that block diagram and or flow chart is shown by computer program instructions
The combination of the block of a block and block diagram and or flow chart diagram for figure.These computer program instructions can be supplied to logical
With computer, the processor of special purpose computer and/or other programmable data processing units, to generate machine, so that via meter
The instruction that calculation machine processor and/or other programmable data processing units execute creates for realizing block diagram and or flow chart block
In specified function action method.
Correspondingly, the application can also be implemented with hardware and/or software (including firmware, resident software, microcode etc.).More
Further, the application can take computer usable or the shape of the computer program product on computer readable storage medium
Formula has the computer realized in the medium usable or computer readable program code, to be made by instruction execution system
It is used with or in conjunction with instruction execution system.In the present context, computer can be used or computer-readable medium can be with
It is arbitrary medium, may include, stores, communicates, transmits or transmit program, is made by instruction execution system, device or equipment
With, or instruction execution system, device or equipment is combined to use.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (26)
1. a kind of method switched over, which is characterized in that this method comprises:
Source base station determines the target BS that terminal needs to switch；
The source base station will need to be sent to target BS by switching request message with the packet information that terminal is transmitted,
And terminal is sent to by mobile control information, so that the target device carries out the same of random access procedure in the terminal
Shi Jinhang core network diameter handoff procedure, and make the terminal and the target BS according to the packet information in core net
Carry out data transmission after the completion of the switching of path.
2. the method as described in claim 1, which is characterized in that the packet information includes wanting between source base station and terminal
Generic sequence SN of the last one allocation of packets of transmission.
3. method according to claim 2, which is characterized in that the packet information further include part in following message or
All:
The generic sequence number for first allocation of packets that will be transmitted between source base station and terminal；
Data packet reception state inquiry request indicates information；
Terminal carry out random access procedure in source base station carry out data transmission using time division multiplexing receive and dispatch TDM mode.
4. the method as described in claim 1, which is characterized in that the data packet that the source base station will need to transmit with terminal
Information is sent to target BS by switching request message, and is sent to after terminal by mobile control information, further includes:
The source base station do not make in random access procedure by random access procedure in the terminal and the target BS
Running time-frequency resource carries out data transmission with the terminal.
5. the method as described in claim 1, which is characterized in that this method further include:
The source base station is sent to target after completing to re-establish the data processing of process, by some or all of caching data packet
Base station, so that the target BS carries out weight when needing to retransmit, according to the packet information and the data packet received
It passes.
6. a kind of method switched over, which is characterized in that this method comprises:
Target BS receives the packet information from source base station, wherein the packet information is that the source base station needs and end
Hold the packet information transmitted；
The target BS carries out after the feedback message for received data packet information for receiving terminal transmission in the terminal
Core network diameter handoff procedure is carried out while random access procedure；
The target BS switches in path to be completed, and after the completion of the random access procedure of the terminal, according to the data packet
Information carries out data transmission with the terminal.
7. method as claimed in claim 6, which is characterized in that this method further include:
The target BS receives the data that the source base station is sent after re-establishing the data processing of process with source base station completion
Packet；
The target BS is retransmitted when needing to retransmit according to the packet information and the data packet received.
8. method as claimed in claim 6, which is characterized in that the packet information includes wanting between source base station and terminal
The generic sequence number of the last one allocation of packets of transmission.
9. a kind of method switched over, which is characterized in that this method comprises:
Terminal receives the packet information from source base station, wherein the packet information be the source base station need and terminal into
The packet information of row transmission；
The terminal to target BS send be directed to received data packet information feedback message, so that the target BS in institute
Terminal is stated to carry out carrying out core network diameter handoff procedure while random access procedure；
The terminal is carrying out path switching completion, and after the completion of random access procedure, according to the packet information and target
Base station terminal carries out data transmission.
10. method as claimed in claim 9, which is characterized in that the terminal receive the packet information from source base station it
Afterwards, further includes:
The terminal passes through the not used running time-frequency resource of random access procedure and the source base station in carrying out random access procedure
Carry out data transmission.
11. method as claimed in claim 10, which is characterized in that this method further include:
After the terminal is carried out data transmission by the not used running time-frequency resource of random access procedure and the source base station, from institute
Source base station is stated to separate and carry out data transmit-receive on target BS.
12. method as claimed in claim 9, which is characterized in that the packet information includes between source base station and terminal
The generic sequence number of the last one that be transmitted allocation of packets.
13. a kind of source base station switched over characterized by comprising processor and transceiver:
The processor for carrying out data transmission by transceiver, and determines the target BS that terminal needs to switch；It will need
The packet information transmitted with terminal is sent to target BS by switching request message, and passes through mobile control information
It is sent to terminal, so that the target device carries out the switching of core network diameter while the terminal carries out random access procedure
Process, and count the terminal and the target BS after the completion of core network diameter switches according to the packet information
According to transmission.
14. source base station as claimed in claim 13, which is characterized in that the packet information include for source base station and terminal it
Between sequence SN of the last one that be transmitted allocation of packets.
15. source base station as claimed in claim 13, which is characterized in that the packet information further includes the portion in following message
Divide or whole:
The generic sequence number for first allocation of packets that will be transmitted between source base station and terminal；
Data packet reception state inquiry request indicates information；
Terminal carry out random access procedure in source base station carry out data transmission using TDM mode.
16. source base station as claimed in claim 13, which is characterized in that the processor is used for:
The packet information transmitted with terminal will needed to be sent to target BS by switching request message, and passed through
Mobile control information is sent to after terminal, is carried out in random access procedure in the terminal and the target BS, by with
The not used running time-frequency resource of machine access procedure carries out data transmission with the terminal.
17. source base station as claimed in claim 13, which is characterized in that the processor is used for:
After completing to re-establish the data processing of process, some or all of caching data packet is sent to target BS, so that
The target BS is retransmitted when needing to retransmit according to the packet information and the data packet received.
18. a kind of target BS switched over characterized by comprising processor and transceiver:
The processor for carrying out data transmission by transceiver, and receives the packet information from source base station, wherein institute
Stating packet information is the packet information that the source base station needs to be transmitted with terminal；It is connect receiving being directed to for terminal transmission
After the feedback message for receiving packet information, core network diameter is carried out while the terminal carries out random access procedure and was switched
Journey；Switch in path and complete, and after the completion of the random access procedure of the terminal, according to the packet information and the terminal
Carry out data transmission.
19. target BS as claimed in claim 18, which is characterized in that the processor is used for:
After re-establishing the data processing of process with source base station completion, the data packet that the source base station is sent is received；
When needing to retransmit, retransmitted according to the packet information and the data packet received.
20. target BS as claimed in claim 18, which is characterized in that the packet information includes for source base station and terminal
Between the last one that be transmitted allocation of packets generic sequence number.
21. a kind of terminal switched over characterized by comprising processor and transceiver:
The processor for carrying out data transmission by transceiver, and receives the packet information from source base station, wherein institute
Stating packet information is the packet information that the source base station needs to be transmitted with terminal；It sends to target BS for reception
The feedback message of packet information, so that the target BS carries out core while the terminal carries out random access procedure
Heart network diameter handoff procedure；Completed carrying out path switching, and after the completion of random access procedure, according to the packet information with
Target BS terminal carries out data transmission.
22. terminal as claimed in claim 21, which is characterized in that the processor is used for:
After receiving the packet information from source base station, in carrying out random access procedure, do not made by random access procedure
Running time-frequency resource carries out data transmission with the source base station.
23. terminal as claimed in claim 21, which is characterized in that the processor is used for:
After being carried out data transmission by the not used running time-frequency resource of random access procedure and the source base station, from the source base station
It separates and carries out data transmit-receive on target BS.
24. terminal as claimed in claim 21, which is characterized in that the packet information includes between source base station and terminal
The generic sequence number of the last one that be transmitted allocation of packets.
25. a kind of equipment switched over, which is characterized in that the equipment include: at least one processing unit and at least one
Storage unit, wherein the storage unit is stored with program code, when said program code is executed by the processing unit,
So that the processing unit perform claim requires the step of 1~5 any the method or any the method for claim 6~8
The step of or the step of claim 9~12 any the method.
26. a kind of computer can storage medium, be stored thereon with computer program, which is characterized in that the program is held by processor
It is realized when row such as the step of Claims 1 to 5 any the method or the step of claim 6~8 any the method or power
Benefit requires the step of 9~12 any the method.
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| CN110519811A (en) * | 2019-08-16 | 2019-11-29 | 成都电科慧安科技有限公司 | A kind of LTE base station cell switching method based on S1 interface |
| CN111194060A (en) * | 2019-12-19 | 2020-05-22 | 京信通信技术(广州)有限公司 | Data processing method, data processing device, computer equipment and storage medium |
| WO2020215340A1 (en) * | 2019-04-26 | 2020-10-29 | Nokia Shanghai Bell Co., Ltd. | Random access procedure |
| WO2021051284A1 (en) * | 2019-09-17 | 2021-03-25 | Oppo广东移动通信有限公司 | Up line retransmission processing method, electronic device and storage medium |
| WO2022056689A1 (en) * | 2020-09-15 | 2022-03-24 | Nokia Shanghai Bell Co., Ltd. | Serving cell change procedure utilizing multiple candidate target cells |
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