CN105722153A - Cell reselection method for CE-MTC UE (Cell-Machine Type Communication User Equipment) - Google Patents
Cell reselection method for CE-MTC UE (Cell-Machine Type Communication User Equipment) Download PDFInfo
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- CN105722153A CN105722153A CN201410407901.2A CN201410407901A CN105722153A CN 105722153 A CN105722153 A CN 105722153A CN 201410407901 A CN201410407901 A CN 201410407901A CN 105722153 A CN105722153 A CN 105722153A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a cell reselection method for UE (User Equipment). The method comprises: A, if the UE is in a coverage enhancement area of a current cell and/or the wireless environment of the UE is changed and/or the UE receives information indicative of the UE working in a coverage enhancement mode from the current cell, running the UE in the coverage enhancement mode; and B, determining, by the UE, a cell or frequency to reside according to network auxiliary information. By adopting the method, when the UE moves or the wireless environment is changed, the UE can quickly determine the cell or frequency to reside, so that the utilization rate of spectra is improved and the power consumption is reduced.
Description
Technical field
The present invention generally relates to wireless communication field, more specifically, for the residence reselecting of CE-MTCUE (subscriber equipment).
Background technology
Machine type communication (MTC) equipment is by the equipment UE for special applications, for instance intelligent electric meter.Owing to some intelligent electric meters are disposed in basement, this will cause that it has higher penetration loss, thus being difficult to communicate with network.Therefore, the MTCUE of low-power consumption and the method for overlay area enhancing it are currently suggested.The purpose strengthening region is in that to promote the covering 15dB of MTCUE.
The current effective overlay area promoting MTCUE, realizes mainly by repeating physical channel, but the number repeated is generally higher (being likely to be breached 100 times), and this substantially will reduce spectrum efficiency.Therefore, for this situation, set up different covering grades, and the UE being in each covering grade is configured to correspond to repetition in various degree.
Although these MTC-UE equipment are considered as static, but still they can have some mobilitys to have company to wish.Except mobility, the change of wireless environment also leads to the change of the level of coverage of MTC-UE.
The community supporting coverage enhancement needs particular channel for UE (such as PDSCH, EPDCCH, PUSCH etc.) for the enough repetition of normal channel transmission.But, if having been completed by UE effectively accumulative and do not revised generation during BCCH revises, that coverage enhancement MTCUE (CE-MTCUE) being in coverage enhancement pattern remains able to receive the PBCH not supporting coverage enhancement community and system information (especially important SIB).The community supporting CE-MTC indicates in SIB, and therefore UE can find whether current area supports CE-MTC easily.
Therefore, the CE-MTCUE being under coverage enhancement pattern may reside within the community not supporting CE-MTC, and receives the crucial SIB for cell reselection.Based on the conventional cell gravity treatment priority of the community not supporting CE-MTC, CE-MTCUE will give not support the frequency priority of CEUE.The current method adopted by LCMTCUE is prohibited from not supporting the community of LCMTCUE.Then, it is believed that UE resides in current community until it finds that another one supports that the community of CE-MTCUE is relatively good.Reason is, UE is likely to be of the wireless environment of a degree of mobility and UE and is likely to change, and these all can cause that UE is non-covered enhancement mode from coverage enhancement patten transformation.
Currently resident cell selection standard is as follows:
Srxlev=Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation(1)
Squal=Qqualmeas-(Qqualmin+Qqualminoffset)(2)
Wherein, QrxlevmeasCurrent service cell for measuring receives power；QrxlevminFor Serving cell minimal detectable power, PcompensationFor offset.QqualmeasFor actually measured EC/NO value, QqualminFor the EC/NO value required.
Required community needs to meet the following conditions:
Srxlev > 0 and Squal > 0
In above-mentioned S criterion, it is possible to by QrxlevminAnd QrxlevminoffsetIt is configured to minima, to guarantee that CE-MTCUE may reside within community.This will UE be attempted reside in any one it detects that community, regardless of whether be support or do not support coverage enhancement UE.After long cell search and gravity treatment, UE can finally reside in the community supporting coverage enhancement UE, but this will waste power consumption.
Summary of the invention
For problem above, the invention provides a kind of residence reselecting for CE-MTCUE.
One aspect of the present invention proposes a kind of residence reselecting for UE, including: if A. UE is in the wireless environment of the coverage enhancement region of current area and/or described UE and produces change and/or receive the described UE that indicates from described current area and need the information being operated under coverage enhancement pattern, then described UE is with coverage enhancement mode operation；B. described UE according to network-assist information determine will be resident community or frequency.
When this technical scheme solves UE with coverage enhancement mode operation, and determines its community that will be resident according to network-assist information.It is to say, when wireless environment is received the notice of current area by good variation or UE, UE can determine if to need to be operated in coverage enhancement pattern according to this change.Obviously, " notice " here is the information indicating its mode of operation from current area.
Preferably, step B also includes: described UE determines the priority of its community detected resident or frequency based on described network-assist information.
So, will ensure that UE auxiliary information Network Based carries out network reselection.
Preferably, when described UE is operated under coverage enhancement pattern, if described UE have selected, by cell reselection, the community not supporting coverage enhancement UE, described UE will reside in the community of gravity treatment.
So, the UE situation being in the community not supporting coverage enhancement UE is defined.
Preferably, when described UE is changed into connection mode by idle pulley, if described UE is in outside the coverage of the first frequency of current area, described UE attempts residing on described first frequency, wherein, described first frequency is once be in frequency resident during connection mode before described UE.
So, UE can utilize the network-assist information obtained before it and current network environment to also determine that the frequency that its needs are resident.
Preferably, described UE receives the described network-assist information sent by described first frequency from described current area.
So, although UE is in outside the coverage of first frequency, but community still can pass through first frequency and send network-assist information to UE.
Preferably, when described UE is in the coverage of the first frequency of current area and resides in described first frequency, described UE receives the described network-assist information from described current area.
So, when UE is in first frequency, community still can by first frequency transmission network-assist information to UE.
Preferably, when described UE moves to the coverage of described first frequency and enters the coverage of second frequency, described UE resides on described second frequency based on described network-assist information and is operated under coverage enhancement pattern, and wherein said second frequency supports the UE of coverage enhancement.
So, it is provided that when UE enters network enhancing region, the method how quickly to select resident frequency.
Preferably, when described UE enters the coverage enhancement region of another community, described UE accesses another community described based on described network-assist information and is operated under coverage enhancement pattern.
Preferably, described UE obtains described network-assist information by receiving the SIB newly increased.
Preferably, described network-assist information includes at least one in the following: support the frequency of the UE of coverage enhancement；Support the list of frequency of the UE of coverage enhancement；Support the community of the vicinity of the UE of coverage enhancement；And support the cell list of the UE of coverage enhancement.
The invention allows for a kind of residence reselecting being applied to base station side, including: send the instruction UE information needing to be operated under coverage enhancement pattern；And/or send network-assist information to UE, wherein, described network-assist information includes at least one in the following: support the frequency of the UE of coverage enhancement；Support the list of frequency of the UE of coverage enhancement；Support the community of the vicinity of the UE of coverage enhancement；And support the cell list of the UE of coverage enhancement.
The invention allows for a kind of subscriber equipment (UE) that can carry out cell reselection, including: detection unit, for detecting region and/or the surrounding wireless environment of current area residing for described UE；Receive unit, be used for receiving network-assist information, described determine based on described network-assist information will be resident community or frequency；Wherein, if detection unit detects that described UE is in the wireless environment around the coverage enhancement region of community and/or described UE and produces change, then described UE is with coverage enhancement mode operation.
Preferably, described UE also comprises timer, and described timer is for controlling the time span that described network-assist information is used.
Preferably, when described UE is changed into connection mode by idle pulley, if described UE is in outside the coverage of the first frequency of current area, described UE attempts residing on described first frequency, wherein, described first frequency is once be in frequency resident during connection mode before described UE；Or when described UE moves to the coverage of described first frequency and enters the coverage of second frequency, described UE resides on described second frequency based on described network-assist information and is operated under coverage enhancement pattern, and wherein said second frequency supports the UE of coverage enhancement.
Preferably, described network-assist information includes at least one in the following: support the frequency of the UE of coverage enhancement；Support the list of frequency of the UE of coverage enhancement；Support the community of the vicinity of the UE of coverage enhancement；And support the cell list of the UE of coverage enhancement.
The present invention can so that UE be when motion or wireless environment variation, it is possible to determine that it is by resident community or frequency, improves the availability of frequency spectrum, and reduces power consumption quickly
Accompanying drawing explanation
After the description of the specific embodiment of the present invention given by reference drawings below, it is better understood with the present invention, and other purposes of the present invention, details, feature and advantage will become apparent from.In the accompanying drawings:
Fig. 1 is the schematic diagram at two kinds of handover between cells of the UE according to the embodiment of the present invention；
Fig. 2 is the network diagram of the community run with two kinds of frequencies according to the embodiment of the present invention.
Detailed description of the invention
It is more fully described the preferred implementation of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows the preferred implementation of the disclosure, however, it is to be appreciated that may be realized in various forms the disclosure and should do not limited by embodiments set forth herein.On the contrary, it is provided that these embodiments are to make the disclosure more thorough and complete, and complete for the region of the disclosure can be conveyed to those skilled in the art.
Compared to forbidding that UE is resident in the cell, for do not support the gravity treatment in the community of coverage enhancement MTCUE provide network-assist information with helps UE find support CE-MTCUE community time, it is allowed to being in the CE-MTCUE of coverage enhancement pattern, to reside in the community not supporting coverage enhancement be relatively good method.
In the present invention, when UE moves to when not supporting the community of CE-MTCUE, remain able to be continuing with the network-assist information of the community of its support CE-MTCUE received at the idling mode.Network-assist information can be frequency or the list of frequency of supporting CE-MTCUE, or supports community or the cell list of the vicinity of CE-MTCUE, and it can be provided by SIB or the signaling specified.Timer can be provided to use this network-assist information.Alternatively, this network-assist information can also by not supporting that the community of CT-MTCUE provides.
When the CE-MTCUE under coverage enhancement pattern reselects the community that is not supported CE-MTCUE, it will reside in the community of gravity treatment, and now UE will access this community in a conventional manner, and namely UE will be switched under non-covered enhancement mode.If CE-MTCUE is not supported in community, then need community being carried out correspondingly upgrading and allow it to send the network-assist information included about near by frequency and/or support or the community not supporting CE-MTCUE.Use network-assist information district is given this frequency priority by resident CE-MTCUE in the cell, thus performing cell reselection or community that lookup is listed.During UE rests on the overlay area of the community not supporting CE-MTCUE, being no longer in coverage enhancement region if UE finds it, it accesses this community by starting.
When the CE-MTCUE being operated under coverage enhancement pattern is in the overlay area of the community supporting CE-MTCUE, it can store the network-assist information from community.If when it moves the overlay area to the community not supporting CE-MTCUE, UE can continue to use its network-assist information obtained from a upper community supporting CE-MTCUE.This will ensure that UE auxiliary information Network Based carries out network reselection, and this network information is from the community of the priority mechanism and information that provide the cell reselection being suitable for CE-MTCUE.UE can also receive these network-assist informations by the signaling specified in the connection mode.Intervalometer (Timer) may be used for limiting the operable time span of this network-assist information
It addition, the present invention also introduces new SIB for carrying the network-assist information of frequency and the adjacent cell information supporting CE-MTCUE.Although network-assist information is to be carried by the community not supporting CE-MTCUE, but this network-assist information need nonetheless remain for the CE-MTCUE that reaches to be in outside covering, to notify that they support the community of CE-MTCUE and frequency.Therefore, it is very easy to the mode of the covering by increasing SIB increases the covering of network-assist information.
The CE-MTCUE of non-covered enhancement mode can carry out cell reselection, thus selecting not support the community of CE-MTCUE, and and routine UE is the same accesses.Due to the change of the weak mobility of UE or around radio condition, CE-MTCUE is likely to be switched to coverage enhancement pattern.CE-MTCUE finds, by using network-assist information to help, the community supporting CE-MTCUE.
Below in conjunction with diagram, embodiments of the invention are illustrated.
Fig. 1 is the schematic diagram at two class handover between cells of the UE according to the embodiment of the present invention, and wherein, territory, the normal coverage area point-like of community represents, the coverage enhancement region oblique line of community represents.
First embodiment:
In this embodiment, community 1 does not support that CE-MTCUE, community 2 support CE-MTCUE, and the marginal area of two cell coverage areas is all coverage enhancement region.Currently, UE1 is in the covering of community 1, and UE2 is in the edge of community 1.
Coverage enhancement region for UE1, RuoUE1Xiang community 2 is moved, owing to UE1 receives the network-assist information sent by community 1, thus obtaining the relevant information of community or the frequency supporting CE-MTCUE.Therefore, when UE1 moves to the coverage enhancement region of community 2, it is the community supporting CE-MTCUE that UE1 can quickly determine community 2 according to this network-assist information, then accesses community 2.It is to say, UE1 can be quickly found the community supporting CE-MTCUE by network-assist information.
For UE2, if the signal intensity that the coverage enhancement region detection that UE2 is in current community 1 arrives is enough good, namely UE2 can read PBCH and the SIB of community 1, and that UE2 may reside within community 1.Network-assist information (frequency comprising community 2 and/or PCI) in the SIB sent by community 1 can help UE to find community 2.
It is to say, if UE2 is also into the coverage enhancement region of community 2, that above-mentioned network-assist information can help UE2 to find community 2 quickly, is in, thus reducing, the time that cell footprint is overseas.Equally, when UE2 has moved to the territory, normal coverage area of community 2, if now UE2 still changes (such as, be deteriorated) at mobile or its wireless environment, then UE2 can be switched to coverage enhancement pattern.
Entering the process of community 1 at UE2 from community 2, UE2 can use its network-assist information obtained from community 2, and namely UE2 auxiliary information Network Based carries out network reselection.After UE2 is completely into community 1, its just conventional UE equally access community, namely it would operate under non-covered enhancement mode.
Fig. 2 is the network diagram of the community run with two kinds of frequencies according to the embodiment of the present invention, and wherein, the overlay area (i.e. territory, normal coverage area) of frequency F1 represents by point-like, supports that the overlay area oblique line shape of the frequency F2 of CE-MTCUE represents.
Second embodiment:
Show referring now to Fig. 2, Fig. 2 with the community 3 that two frequencies (F1 and F2) are run.Frequency F1 only supports conventional covering, and frequency F2 then supports the UE of coverage enhancement.It is understood that owing to frequency F2 supports CE-MTCUE, therefore which reduce spectrum efficiency.Therefore, in order to avoid spectrum efficiency too reduces, it is necessary to configure a frequency supporting CE-MTCUE for MTC device, for instance frequency F2, this makes the reduction degree of spectrum efficiency be only a frequency.
As can be seen from Figure, UE3 is nearly at outside the overlay area of frequency F1, and can be configured to reside in community 1 on frequency F1.UE3 will receive network-assist information, namely comprise the fresh information block (IE) about the community and frequency supporting CE-MTCUE, thus obtaining the relevant information supporting CE-MTCUE.
Based on this network-assist information, UE3 is it will be appreciated that CE-MTCUE is supported in community 3 on frequency F2.The edge of RuoUE3Xiang community 3 moves, such as it moves out the overlay area of frequency F1, due to UE3 it have been found that frequency F2 supports CE-MTCUE, therefore UE3 can be quickly carried out frequency re-selections, thus selecting frequency F2, and it is operated under coverage enhancement pattern, it is to avoid on frequency F2, process is found in long community.
3rd embodiment:
Please continue to refer to Fig. 2, when UE4 starts shooting and is in outside the overlay area of frequency F1.Owing to the frequency that the last time of UE4 is successfully resident is F1, and as common process, UE4 first attempts to reside on the frequency F1 of community 3.UE4 reads PSS (the master sync signal)/SSS (auxiliary synchronous signals) and MIB of F1 with being configured to the trial and success by repeating.Although F1 does not support CE-MTCUE, as a current embodiment, community 3 still can send network-assist information (namely new SIB) and comprise the information about the frequency and community supporting CE-MTCUE to UE4, corresponding SIB.
UE4 reads other SIB in the frequency F1 of community 3 by trial or other is based on the UE method realized, it is determined that it is in the coverage enhancement region of community 3.Then UE4 reselection frequency F2, and be operated under coverage enhancement pattern, thus avoiding long-term cell search procedure on a different frequency.
Above-mentioned example is only embodiments of the invention, it is understandable that, RuoUECong community 1 enters community 3, UE auxiliary information Network Based can also know that the frequency of coverage enhancement is supported in community 3, thus UE can access the corresponding frequencies of community 3, it is clear that this frequency can be equal or unequal with the frequency of community 1.
The present invention proposes a kind of trigger mechanism, when UE from one cover grade move cover grade to another time, it is allowed to UE estimates and to network-reporting.Based on the method for above-mentioned enforcement, CE-MTCUE can also be the enforcement that the replacement of LC-MTCUE, UE has no effect on technique scheme.It addition, UE can also pass through the UE that indicates received from current area needs the information being operated under coverage enhancement pattern, and then determine its mode of operation.
It will be appreciated to those of skill in the art that above-mentioned state is used only for example, be not intended to limit the application region of the present invention.Those of ordinary skill in the art it is also understood that the various exemplary logical block, module, circuit and the algorithm steps that describe in conjunction with embodiments herein can be implemented as electronic hardware, computer software or combination.In order to clearly show that this interchangeability between hardware and software, above various exemplary parts, block, module, circuit and step are all carried out general description around its function.It is implemented as hardware as this function and is also implemented as software, depend on specific application and apply design constraint over the whole system.Those skilled in the art for every kind of application-specific, can realize described function in the way of flexible, but, this realize decision-making and should not be construed as the protection zone deviating from the present invention.
Claims (15)
1. for a residence reselecting of UE, including:
If A. the wireless environment in coverage enhancement region and/or described UE that UE is in current area produces the described UE that indicates changing and/or receiving from described current area needs the information being operated under coverage enhancement pattern, then described UE is with coverage enhancement mode operation；
B. described UE according to network-assist information determine will be resident community or frequency.
2. the method for claim 1, wherein step B also includes:
Described UE determines the priority of its community detected resident or frequency based on described network-assist information, and selects resident community or frequency according to described priority.
3. method as claimed in claim 2, wherein,
When described UE is operated under coverage enhancement pattern, if described UE have selected, by cell reselection, the community not supporting coverage enhancement UE, described UE is by the community residing in gravity treatment with non-covered enhancement mode.
4. method as claimed in claim 2, wherein,
When described UE is changed into connection mode by idle pulley, if described UE is in outside the coverage of the first frequency of current area, then described UE attempts residing on described first frequency, and wherein, described first frequency is once be in frequency resident during connection mode before described UE.
5. method as claimed in claim 4, wherein,
Described UE receives the described network-assist information sent by described first frequency from described current area.
6. method as claimed in claim 2, wherein,
When described UE is in the coverage of the first frequency of current area and resides in described first frequency, described UE receives the described network-assist information from described current area.
7. method as claimed in claim 6, wherein,
When described UE moves to the coverage of described first frequency and enters the coverage of second frequency, described UE resides on described second frequency based on described network-assist information and is operated under coverage enhancement pattern, and wherein said second frequency supports the UE of coverage enhancement.
8. method as claimed in claim 2, wherein, when described UE enters the coverage enhancement region of another community, described UE accesses another community described based on described network-assist information and is operated under coverage enhancement pattern.
9. the method for claim 1, wherein
Described UE obtains described network-assist information by receiving the SIB newly increased.
10. the method for claim 1, wherein described network-assist information includes at least one in the following:
Support the frequency of the UE of coverage enhancement；
Support the list of frequency of the UE of coverage enhancement；
Support the community of the vicinity of the UE of coverage enhancement；And
Support the cell list of the UE of coverage enhancement.
11. be applied to a residence reselecting for base station side, including:
Send the instruction UE information needing to be operated under coverage enhancement pattern；And/or
Sending network-assist information to described UE, wherein, described network-assist information includes at least one in the following:
Support the frequency of the UE of coverage enhancement；
Support the list of frequency of the UE of coverage enhancement；
Support the community of the vicinity of the UE of coverage enhancement；And
Support the cell list of the UE of coverage enhancement.
12. the subscriber equipment (UE) that cell reselection can be carried out, including:
Detection unit, for detecting region and/or the surrounding wireless environment of current area residing for described UE；
Receive unit, for receive from described current area indicate described UE need to be operated in the information under coverage enhancement pattern and/or network-assist information, described UE based on described network-assist information determine will be resident community or frequency；
Wherein, if detection unit detects that described UE is in the wireless environment around the coverage enhancement region of community and/or described UE and produces change, then described UE is with coverage enhancement mode operation.
13. subscriber equipment as claimed in claim 12, wherein,
Described UE also comprises timer, and described timer is for controlling the time span that described network-assist information is used.
14. subscriber equipment as claimed in claim 12, wherein,
When described UE is changed into connection mode by idle pulley, if described UE is in outside the coverage of the first frequency of current area, described UE attempts residing on described first frequency, and wherein, described first frequency is once be in frequency resident during connection mode before described UE；Or
When described UE moves to the coverage of described first frequency and enters the coverage of second frequency, described UE resides on described second frequency based on described network-assist information and is operated under coverage enhancement pattern, and wherein said second frequency supports the UE of coverage enhancement.
15. subscriber equipment as claimed in claim 12, wherein, described network-assist information includes at least one in the following:
Support the frequency of the UE of coverage enhancement；
Support the list of frequency of the UE of coverage enhancement；
Support the community of the vicinity of the UE of coverage enhancement；And
Support the cell list of the UE of coverage enhancement.
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| CN110602751A (en) * | 2018-06-13 | 2019-12-20 | 中国电信股份有限公司 | Cell reselection method and device, and user terminal |
| WO2019242622A1 (en) * | 2018-06-21 | 2019-12-26 | FG Innovation Company Limited | Method and apparatus for performing cell (re) selection in wireless communication system |
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| WO2018082689A1 (en) * | 2016-11-04 | 2018-05-11 | 中兴通讯股份有限公司 | Method and apparatus for selecting and accessing network, and computer storage medium |
| US11172376B2 (en) | 2016-11-04 | 2021-11-09 | Zte Corporation | Method and apparatus for selecting and accessing network, and computer storage medium |
| CN108574968A (en) * | 2017-03-13 | 2018-09-25 | 中兴通讯股份有限公司 | Base station, mixed networking resource information are obtained, are reported and cell switching method |
| CN110169111A (en) * | 2017-03-20 | 2019-08-23 | 华为技术有限公司 | Method, terminal device and the network equipment of covering pattern switching |
| CN110637488A (en) * | 2017-03-23 | 2019-12-31 | 瑞典爱立信有限公司 | Network node, wireless communication device, method, and computer program |
| CN110602751A (en) * | 2018-06-13 | 2019-12-20 | 中国电信股份有限公司 | Cell reselection method and device, and user terminal |
| WO2019242622A1 (en) * | 2018-06-21 | 2019-12-26 | FG Innovation Company Limited | Method and apparatus for performing cell (re) selection in wireless communication system |
| US11272406B2 (en) | 2018-06-21 | 2022-03-08 | FG Innovation Company Limited | Method and apparatus for performing cell (re)selection in wireless communication system |
| US11382011B2 (en) | 2018-06-21 | 2022-07-05 | FG Innovation Company Limited | Method and apparatus for performing cell (re)selection in wireless communication system |
| US11758450B2 (en) | 2018-06-21 | 2023-09-12 | FG Innovation Company Limited | Method and apparatus for performing cell (re)selection in wireless communication systems |
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