CN105357726B - LTE fast switch over method based on downlink timing offset and target BS pre-authorization - Google Patents
LTE fast switch over method based on downlink timing offset and target BS pre-authorization Download PDFInfo
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- CN105357726B CN105357726B CN201510916028.4A CN201510916028A CN105357726B CN 105357726 B CN105357726 B CN 105357726B CN 201510916028 A CN201510916028 A CN 201510916028A CN 105357726 B CN105357726 B CN 105357726B
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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
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
Abstract
The invention discloses a kind of LTE fast switch over method based on downlink timing offset and target BS pre-authorization, this method is a kind of method for effectively shortening Target cell access delay on the basis of it can meet the requirements proposed based on actual scene, mainly includes two contents：Target cell uplink synchronous is carried out based on the downgoing time difference of Target cell and cell-of-origin；Handoff completion message is sent in Target cell based on the physical uplink shared channel scheduling of pre-authorization, the present invention is compared with prior art, handover delay can be greatly lowered, and since pre-authorization frequency is higher, time delay fluctuation range will not be very big, simultaneously because licensing the mode of display notice, resource contention will not be brought.
Description
Technical field
The present invention relates to a kind of LTE fast switch over method, belong to wireless communication technology field.
Background technology
LTE handoff procedures include four steps at present：
1st step, terminal measure and to cell-of-origin reporting measurement reports Target cell in cell-of-origin；
2nd step, cell-of-origin switches over judgement, and carries out resource negotiation with Target cell；
3rd step, cell-of-origin issue the switching command for including Target cell resource to terminal；
4th step, terminal are accessed in Target cell.
Wherein, for the 4th step, terminal is currently to be performed according to random access procedure, such as when Target cell accesses
Shown in Fig. 1, it is as follows：
4.1：Terminal sends lead code Prach Preamble by Physical Random Access Channel PRACH, this message is led to
Frequently referred to MSG 1；
4.2：Base station sends random access response RAR by Physical Downlink Shared Channel PDSCH to terminal
（RandomAccessResponse）, this message is commonly referred to as MSG 2；
4.3：Authorization message of the terminal in MSG 2 and sequential relationship send MSG3 message, including having switched
Into message（RRCConnection ReconfigurationComplete）.
Wherein, there is specific sequential relationship between MSG1, MSG2 and MSG3, specially：
MSG1 is sent using Physical Random Access Channel PRACH resources, PRACH transmission delays and the density of PRACH configurations
It is related.In the case of without using special subframe, PRACH shares letter with physical uplink control channel PUCCH, physical uplink
Road PUSCH shares upstream frequency resource, and under conditions of the frequency domain resource occupied in PUCCH is certain, the resource that PRACH is occupied is got over
More, access efficiency is higher, and access delay can be smaller, and the resource that PUSCH is occupied simultaneously then can be accordingly fewer, and the uplink of system gulps down
Spitting rate can also reduce, therefore PRACH and PUSCH resources need reasonable distribution.It is as 0 using conventional use of Prach configuration indexes
Example is 20ms for the periods of 1, PRACH of proportioning in the time domain, can be sent there are one sub-frame of uplink in each 20ms periods
Therefore PRACH, 20ms will be waited for from PRACH is ready for sending to the time delay longest that can actually send PRACH.
Time interval between MSG1 and MSG2 is grown to control by MSG2 reception windows, according to agreement, when reception window originates
Quarter is calculated since the subframe that MSG1 transmissions terminate adds 3.For medium configuration 5 according to reception window length, it is issued to from MSG1
8ms will be reached by receiving the time interval of MSG2.
And from MSG2 is received to the time interval for sending MSG3, it is since the subframe for receiving MSG2 adds 6 according to agreement
Sub-frame of uplink, and due to TD-LTE TDD limit, the 6th subframe is not that the ratio of sub-frame of uplink is higher, therefore MSG2 is arrived
MSG3 is typically greater than 6ms.
Switching sequence example：
For being below 0 as 1, PRACH configuration indexes using subframe proportioning, shown by Fig. 2 from RRCConnectionReco
NfigurationComplete generates the sequential relationship to transmission：
1）After terminal receives the reconfiguration message of switching, in SFN=11, subframe number=1 at the time of, generates
Handoff completion message RRCConnectionReconfigurationComplete, and be ready for sending；
2）Since PRACH only exists in the subframe 3 of even number radio frames, PRACH can only be in SFN=12, subframe
Number=3 are sent；
3）5, MSG2 is configured in SFN=12 according to window length, and subframe number=9 are sent；
4）According to the sequential relationship of MSG2 and MSG3, MSG3 is sent in SFN=13, subframe number=7, at this time
The base station that RRCConnection ReconfigurationComplete are sent is carried in MSG3, handoff procedure just calculates completion.
According to process above, generated from RRCConnectionReconfigurationComplete message to real hair
It send, during which when a length of 13 *, 10+7-11 * 10+1=26ms of experience.
If switching reconstitution process is happened in SFN=10, RRCConnectionReconfigurationComplete disappears
In SFN=10, subframe number=1 generates breath, and the PRACH resources of this radio frames are since time deficiency cannot at this time
It uses, therefore, SFN=12, the PRACH of subframe number=9 can only be used to send MSG1, in this case,
The transmission delay of RRCConnectionReconfigurationComplete reach 13 * 10+7-10 * 10+1=
36ms.It is specific as shown in Figure 3.
Even if it can be sent, but the sequential relationship of subsequent message is not ahead of time according to PRACH most short configuration period 5ms, MSG1
Significant change is had, transmission delay is 12 * 10+7-11 * 10+1=16ms, such as Fig. 4 at this time.And this needs end
End can be sent in strict accordance with 5ms periodic schedulings PRACH, and in fact due to PRACH unlike other channels have stringent sequential
Limitation, usual terminal prepares PRACH and sends the time needed 2ms shown in figure incessantly, if the standard according to shorter 5ms
Standby time, sequential relationship will become situation shown in fig. 5, at this time RRCConnectionReconfigurationComplete
Transmission delay for 13 *, 10+2-11 * 10+1=21ms, this time is also still long.
In prior art switching, the Target cell of handoff procedure, which accesses, to be realized based on random access procedure, this reality
Existing mode has following defect：
1st, random access time is long, and random access procedure needs carry out 3 friendships between terminal and LTE base station eNodeB
Mutually, each interactive process has stringent sequential relationship, and convenient in view of realizing, the time delay redundancy between message compares
Greatly, this results in total turn-on time long.
2nd, time delay and frequency domain resource difficulty are coordinated, and in order to meet covering demand, PRACH is typically configured in normal uplink
Frame, and PRACH can tie up Traffic Channel PUSCH resources at this time, and this occupy is periodically lasting.If reduced
Prolong the distribution frequency in the time domain it is necessary to increase PRACH, and system-through-up capability can reduce at this time；And if reducing PRACH
Time domain is distributed, and access delay has and can increase while handling capacity is promoted, it is difficult to balance.
3rd, time delay optimization space is limited, is provided based on existing agreement and limit that eNodeB and terminal-pair PRACH are realized
System, the relatively good situation of access delay is all in more than 20ms, it is difficult to advanced optimize.
4th, Delay Variation range is big, and the handover delay of system needs are subject to maximum delay, and according to the example of Section 3,
In the case that configuration is certain, the time delay distribution range of access is larger so that the handover delay degradation of system entirety.
Invention content
The technical problems to be solved by the invention are effectively to shorten the time delay of Target cell on the basis of meeting the requirements, and are carried
Go out a kind of LTE fast switch over method based on downlink timing offset and target BS pre-authorization.
The present invention using following technical scheme, is as follows to solve above-mentioned technical problem：
A kind of LTE fast switch over method, includes the following steps：
Step 1：Terminal obtains the downlink timing information of Target cell, while small with source when measuring Target cell process
The clock in area keeps synchronizing, and obtains the downlink timing information of cell-of-origin, is believed based on the downlink timing to cell-of-origin and Target cell
Breath, calculates deviation of the Target cell relative to the downlink transmission link between cell-of-origin, according to uplink and downlink link by terminal
Symmetry, obtain deviation of the Target cell relative to the uplink transmission link between cell-of-origin；
Step 2：Resource needed for cell-of-origin to Target cell request switching, including pre-authorization resource, Target cell root
Pre-authorization resource is distributed according to Physical Uplink Shared Channel PUSCH, by resource notification needed for switching to cell-of-origin, and according to pre-authorization
The distribution of resource carries out uplink scheduling, and authorization message by configuration information DCI0 is shown and is handed down to terminal；
Step 3：Cell-of-origin issues handover request to terminal, including the pre-authorization resource of Target cell distribution；
Step 4：Terminal is according to pre-authorization resource, according to Target cell and the deviation of the uplink transmission link of cell-of-origin
Start to monitor DCI0 in Target cell, when receiving the DCI0 for belonging to Target cell, then using pre-authorization resource therein to mesh
It marks cell and sends handoff completion message；
Step 5：Target cell stops pre-authorization after effective completion message is received on PUSCH.
As the further prioritization scheme of LTE fast switch over method of the present invention, Target cell supports the distribution of pre-authorization
And scheduling；It supports the handoff procedure processing accessed based on PUSCH, and supports X2, UU interface message to pre-authorization resource parameters
Encapsulation and parsing；Terminal supports the handoff procedure processing accessed based on PUSCH, and UU interface messages is supported to join pre-authorization resource
Several encapsulation and parsing.
As the further prioritization scheme of LTE fast switch over method of the present invention, pre-authorization resource only refers to time-domain resource, when
Domain resource is deviated by pre-schedulingPreSchOffsetParameter and pre-scheduling periodPreSchCycleParameter identifies, and is used to indicate
The subframe numbers SN (subframe number) that DCI0 is issued, needs to meet：
[(SFN * 10) + SN] modulo (PrSchCeycle) = (PreSchOffset) modulo
(PreSchCycle), wherein SFN（System Frame Number）For System Frame Number.
As the further prioritization scheme of LTE fast switch over method of the present invention, DCI0 show issue the cell that uses without
Line Network Temporary Identifier C-RNTI is the C-RNTI that Target cell distributes to terminal, and pre-authorization resource is according under configuration periodicity
Hair.
As the further prioritization scheme of LTE fast switch over method of the present invention, if terminal is in two wireless frame periods
When not receiving configuration information inside, retract and complete switching using original random access procedure.
Using above technical scheme compared with prior art, handover delay can be greatly lowered in the present invention, and due to
Pre-authorization frequency is higher, and time delay fluctuation range will not be very big, simultaneously because licensing the mode of display notice, will not bring
Resource contention from the perspective of resource occupation, sends RRCConnectionReconfigurationComplete usually only
Need a small amount of resource block Resource Block that can meet, simultaneously because it is smaller that total duration is authorized usually all to set,
Therefore to the waste very little of resource, in addition, the present invention has also fully considered that the cut-in method under fail condition retracts, Ke Yibao
Card handover success rate will not reduce.
Description of the drawings
3 interactive modes when Fig. 1 is random access procedure between terminal and eNodeB.
Fig. 2, Fig. 3, Fig. 4, Fig. 5 be it is several in background technology in the case of RRCConnectionReconfigurationComp
Lete generates the sequential relationship to transmission.
Fig. 6 is the step flow chart of the present invention.
Fig. 7 is Target cell time-delay calculation schematic diagram of the present invention.
Fig. 8 is pre-authorization mode particular flow sheet of the present invention.
Fig. 9 is the sequence diagram using inventive algorithm.
Figure 10 be the present invention for terminal do not receive DCI0 and according to original switching sequence figure.
Specific embodiment
Technical scheme of the present invention is described in further detail below in conjunction with the accompanying drawings.Those skilled in the art of the present technique can
With understanding, unless otherwise defined, all terms used herein（Including technical terms and scientific terms）With with this hair
The identical meaning of the general understanding of those of ordinary skill in bright fields.It should also be understood that in such as general dictionary
Those terms of definition, which should be understood that, to be had a meaning that is consistent with the meaning in the context of the prior art, and unless picture
Here it equally defines, will not be explained with the meaning of idealization or too formal.
As shown in fig. 6, the idiographic flow of the present invention is as follows：
1st, terminal measures Target cell signal strength, while measures the downlink delay inequality between Target cell and cell-of-origin；
2nd, when meeting handoff threshold to cell-of-origin reporting measurement reports；
3rd, cell-of-origin is to Target cell application switchable resource；
4th, Target cell distribution switchable resource, and proceed by pre-granted right scheduling；
5th, the switchable resource of distribution and pre-authorization scheduling resource are returned to cell-of-origin by Target cell；
6th, cell-of-origin issues handover request RRCConnectionReconfiguration to terminal, including pre-authorization
Configuration；
7th, terminal receive complete after RRCConnectionReconfiguration message it is internal be configured, generate and to lower floor
Submit RRCConnectionReconfigurationComplete message；
8th, terminal obtains Target Cell Identifier from RRCConnectionReconfiguration, calculate Target cell with
The delay inequality of cell-of-originTn-s-offset, when calculating the transmission of Target cell according to the uplink transmission delay of current service cell
ProlongTn-offset；
9th, terminal is configured parameter PreSchOffset and PreSchCycle according to pre-authorization and begins listening for DCI0；
If the 10th, DCI0 is received in 2 wireless frame periods：
10.1 authorize transmission PUSCH according to DCI0, wherein including RRCConnectionReconfigurationComple
Te and MAC layer BSR, transmission delay offset is using Tn-offset, on the basis of Target cell downlink timing.
10.2 base stations receive PUSCH, cancel pre-granted right scheduling；
If the 11st, DCI0 is not received in 2 wireless frame periods：
11.1 terminals find PRACH in next radio frames and send opportunity, send MSG1；
11.2 base stations receive and send MSG2 to terminal after PRACH；
11.3 terminals are configured according to MSG2 and carry out uplink synchronous, MSG3 are sent, including RRCConnectionRecon
figurationComplete。
No matter the 12, receiving DCI0 or random access success, terminal all thinks to switch successfully, otherwise it is assumed that handover failure.
Here is the specific embodiment of synchronization process：
Terminal can get the accurate 10ms and 1ms downlinks timing of Target cell during Target cell is measured
Information, while terminal is synchronous with the holding of cell-of-origin clock, also has the downlink timing information of cell-of-origin, based on to cell-of-origin and target
The measurement data of the downlink timing of cell, terminal can accurately calculate Target cell relative to the downlink timing between cell-of-origin
Deviation is denoted asT n-s-offset .Due to the symmetry of uplink downlink, time delay and the downlink one of two cell uplink transmission links
Cause andT n-s-offset 。
Terminal receives the switching command that base station issues, and prepares to be accessed in Target cell.If as shown in fig. 7, terminal
The uplink time delay finally used in cell-of-origin isT s-offset , then its time delay used when Target cell is sent（Relative to target
Cell downlink Timing Synchronization）For：
T
n-offset
=T
s-offset
+T
n-s-offset
And for traditional Random Access, result of the terminal based on Target cell down-going synchronous is directly in Target cell
It is accessed, blind synchronization is surveyed in target quite in the case of no any prior information, at the time of reaching Target cell at this time
It is close with the distance relation of terminal and target cell base station completely without predictability.And based on the present invention Access Algorithm, then
It considers the downlink timing relationship between Target cell and cell-of-origin and applies it to uplink transmission, it is anticipated that it can be accurate
Target cell reception window is reached, and unrelated with the distance of base station with terminal.
According to analysis above, it can more accurately reach Target cell using the algorithm terminal uplink transmission of the present invention
Reception window, therefore tradition adapts to the strategy no longer needs of large-scale time delay estimation by PRACH, can by PUSCH
To meet the needs of time delay assessment.
It is the specific embodiment of authorisation process below：
PUSCH is directly used since Target cell access can not use PRACH, it is therefore desirable to consider awarding for PUSCH
The problem of how power distributes, present invention proposition use the authorization of pre-authorization, and detailed process as shown in Figure 8 is：
1st, cell-of-origin prepares to switch the terminal into Target cell, therefore to Target cell application switchable resource；
2nd, Target cell distribution switching needed for resource, including uplink pre-authorization resource, and by related resource notify to
Cell-of-origin.The only specified time-domain resource of pre-authorization resource, and frequency domain resource is indicated by DCI0, time-domain resource is by two parametersPreSchOffsetWithPreSchCycleIt identifies, indicates the subframe numbers SN (subframe number) that DCI0 is issued, it is full
Foot：
[(SFN * 10) + SN] modulo (PreSchCycle) = (PreSchOffset) modulo
(PreSchCycle)
3rd, Target cell starts to carry out uplink scheduling according to the resource allocation of pre-authorization, and authorization message is shown down by DCI0
Hair, the C-RNTI used are the C-RNTI that target side distributes to UE, and uplink scheduling is periodically issued according to configuration.
4th, Target cell issues switching command RRCConnectionReconfiguration message to terminal, including
Pre-authorization resource parametersPreSchOffsetWithPreSchCycle。
5th, terminal starts to monitor DCI0 in Target cell according to pre-authorization configuration, when receiving the DCI0 for belonging to it, then makes
With authorization message therein handoff completion message is sent to Target cell：RRCConnectionReconfiguration
Complete, the offset of physical layer transmission delay calculate the time delay value of gained using upper one sectionT n-offset 。
6th, Target cell stops pre-authorization after effective completion message is received on PUSCH.
It is described according to above-mentioned two sections, the present invention meets two aspect need of Target cell random access in conventional handover procedure
It asks, therefore can ensure the smooth execution in handoff procedure.
In order to realize the method for the present invention, eNodeB and terminal need to support following functions：
eNodeB：
Support the distribution and scheduling of pre-authorization resource；
Support the handoff procedure processing accessed based on PUSCH；
Support encapsulation and parsing of X2, UU interface message to pre-granted weight parameter；
Terminal：
Support the offset of target side sending timeT n-offset Calculating and use；
Support the handoff procedure processing sent based on pre-authorization PUSCH；
Support encapsulation and parsing of the UU interface messages to pre-granted weight parameter；
It is switched over using inventive algorithm, parameter is configuredPreSchOffset=4,PreSchCycle=For 5,
Sequential relationship is as shown in Figure 9：
Since before handover request RRCConnectionReconfiguration is issued to terminal, Target cell is
Pre-authorization resource is got out, therefore, in the SFN=9, subframe that RRCConnectionReconfiguration is reached
Before number=9, Target cell may have begun pre-granted right scheduling.
Assuming that RRCConnectionReconfigurationComplete message is still in SFN=10, subframe
Number=1 is generated, and since the DCI0 of pre-authorization is in subframe 4 and 9, handoff completion message earliest can in SFN=10,
Subframe number=8 are sent to eNodeB, and transmission delay is 10 *, 10+8-10 * 10+1=7ms.The value
21ms with calculating before shortens 14ms, that is, reduces 67%；If shortening 29ms compared with 36ms, 80% is reduced, when
Prolong reducing effect clearly.
It should be noted that the following in implementation procedure：
1st, RRCConnectionReconfiguration message and RRCConnectionReconfigurationCompl
Ete message will use relatively low modulating-coding grade MCS, success rate be sent to improve message, so as to shorten pre-authorization
Duration；
2nd, mixed automatic retransfer is supported for carrying the PUSCH of RRCConnectionReconfigurationComplete
HARQ procedure is asked, the HARQ configured numbers of MSG3 in system configuration can be used；
3rd, the standard that Target cell cancels pre-authorization is that the PUSCH power that receives and signal-to-noise ratio are effective, even if CRC check
Mistake is also considered as terminal and has been received by DCI0 mandates, can terminate pre-authorization, complete PUSCH by HARQ procedure later
It retransmits；
4th, DCI0 authorizes the space for needing to consider that Padding BSR can be accommodated, and dispatches and uses so as to subsequent upstream；
5th, end side receives DCI0 and then thinks to switch successfully；
If the 6, terminal does not receive DCI0, complete Target cell using conventional random access procedure and access；
7th, base station needs to support the access of new algorithm and conventional algorithm simultaneously.
It does not receive DCI0 for terminal and the situation of switching is completed according to random access procedure, sequential is as shown in Figure 10：
If terminal does not receive pre-authorization within 2 radio-frame time periods, begun look for from next radio frames
PRACH resources send MSG1, are accessed by random access procedure in Target cell, so as to complete handoff procedure.
The above is only some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of LTE fast switch over method, which is characterized in that include the following steps：
Step 1：Terminal obtains the downlink timing information of Target cell when measuring Target cell process, at the same with cell-of-origin
Clock keeps synchronizing, and obtains the downlink timing information of cell-of-origin, based on the downlink timing information to cell-of-origin and Target cell, by
Terminal calculates deviation of the Target cell relative to the downlink transmission link between cell-of-origin, according to pair of uplink and downlink link
Title property, obtains deviation of the Target cell relative to the uplink transmission link between cell-of-origin；
Step 2：Resource needed for cell-of-origin to Target cell request switching, including pre-authorization resource, Target cell is according to object
Uplink Shared Channel PUSCH distribution pre-authorization resources are managed, by resource notification needed for switching to cell-of-origin, and according to pre-authorization resource
Distribution carry out uplink scheduling, authorization message by configuration information DCI0 is shown and is handed down to terminal；Wherein, pre-authorization resource is only
Refer to time-domain resource, time-domain resource by pre-scheduling deviate PreSchOffset parameters and pre-scheduling period PreSchCycle parameters Lai
Mark, is used to indicate the subframe numbers SN that DCI0 is issued, needs to meet：
[(SFN*10)+SN] modulo (PreSchCycle)=(PreSchOffset) modulo (PreSchCycle)
Wherein, SFN is System Frame Number；
Step 3：Cell-of-origin issues handover request to terminal, including the pre-authorization resource of Target cell distribution；
Step 4：Terminal starts according to pre-authorization resource according to the deviation of Target cell and the uplink transmission link of cell-of-origin
DCI0 is monitored in Target cell, it is when receiving the DCI0 for belonging to Target cell, then small to target using pre-authorization resource therein
Area sends handoff completion message；
Step 5：Target cell stops pre-authorization after effective completion message is received on PUSCH.
2. LTE fast switch over method according to claim 1, which is characterized in that
Target cell supports the distribution and scheduling of pre-authorization；Handoff procedure access based on PUSCH is supported to handle, and support X2,
Encapsulation and parsing of the UU interface messages to pre-authorization resource parameters；
Terminal supports the handoff procedure processing accessed based on PUSCH, and supports envelope of the UU interface messages to pre-authorization resource parameters
Dress and parsing.
3. LTE fast switch over method according to claim 1, which is characterized in that DCI0 show issue the cell that uses without
Line Network Temporary Identifier C-RNTI is the C-RNTI that Target cell distributes to terminal, and pre-authorization resource is according under configuration periodicity
Hair.
4. LTE fast switch over method according to claim 1, which is characterized in that if terminal is in two wireless frame periods
When not receiving configuration information inside, retract and complete switching using original random access procedure.
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| CN107018538A (en) * | 2016-01-27 | 2017-08-04 | 普天信息技术有限公司 | A kind of method, base station and user equipment for reducing switching time |
| JP2019083358A (en) * | 2016-03-17 | 2019-05-30 | シャープ株式会社 | Terminal device, base station device, communication method, and integrated circuit |
| CN107277929A (en) * | 2016-04-07 | 2017-10-20 | 北京信威通信技术股份有限公司 | The method of packet delay is reduced in a kind of handoff procedure |
| CN107426810B (en) * | 2016-05-23 | 2022-04-29 | 中兴通讯股份有限公司 | Method and device for acquiring uplink timing |
| CN107682899A (en) * | 2016-08-01 | 2018-02-09 | 中兴通讯股份有限公司 | Switching handling method and device |
| US20180049079A1 (en) * | 2016-08-12 | 2018-02-15 | Qualcomm Incorporated | Handover in wireless communications |
| CN107734576A (en) * | 2016-08-12 | 2018-02-23 | 中兴通讯股份有限公司 | Method for transmitting uplink data and device |
| CN106941702B (en) * | 2017-04-19 | 2020-05-29 | 上海创远仪器技术股份有限公司 | Method for realizing switching time detection control of mobile communication terminal device |
| CN107517461B (en) * | 2017-08-21 | 2021-08-27 | 上海掌门科技有限公司 | Method and equipment for carrying out wireless connection pre-authorization on user equipment |
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