( 12 ) United States Patent
`Nigam et al .
`
`( 54 ) METHOD AND APPARATUS FOR
`PROCESSING SYSTEM INFORMATION IN
`COMMUNICATION SYSTEM
`( 71 ) Applicant : Samsung Electronics Co . , Ltd ,
`Gyeonggi - do ( KR )
`( 72 ) Inventors : Anshuman Nigam , Bangalore ( IN ) ;
`Jung - Soo Jung , Gyeonggi - do ( KR ) ;
`Sun - Heui Ryoo , Gyeonggi - do ( KR ) ;
`Jung - Min Moon , Gyeonggi - do ( KR ) ;
`Sung - Jin Lee , Gyeonggi - do ( KR )
`( 73 ) Assignee : Samsung Electronics Co . , Ltd . ,
`Suwon - si ( KR )
`Subject to any disclaimer , the term of this
`patent is extended or adjusted under 35
`U . S . C . 154 ( b ) by 0 days .
`15 / 115 , 651
`( 21 ) Appl . No . :
`Jan . 29 , 2015
`( 22 ) PCT Filed :
`PCT / KR2015 / 001005
`( 86 ) PCT No . :
`$ 371 ( c ) ( 1 ) ,
`Jul . 29 , 2016
`( 2 ) Date :
`( 87 ) PCT Pub . No . : WO2015 / 115856
`PCT Pub . Date : Aug . 6 , 2015
`Prior Publication Data
`US 2017 / 0171797 A1
`Jun . 15 , 2017
`Foreign Application Priority Data
`( 30 )
`Jan . 29 , 2014
`( IN ) . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 / KOL / 2014
`( 51 ) Int . Ci .
`H04W 48 / 12
`H04W 68 / 00
`
`( 2009 . 01 )
`( 2009 . 01 )
`( Continued )
`
`( * ) Notice :
`
`( 65 )
`
`US010237810B2
`
`( 56 )
`
`( 10 ) Patent No . : US 10 , 237 , 810 B2
`( 45 ) Date of Patent :
`Mar . 19 , 2019
`( 52 ) U . S . CI .
`CPC . . . . . . . . . . H04W 48 / 12 ( 2013 . 01 ) ; H04W 68 / 005
`( 2013 . 01 ) ; H04W 68 / 02 ( 2013 . 01 ) ; H04W
`88 / 02 ( 2013 . 01 ) ; H04W 88 / 08 ( 2013 . 01 )
`( 58 ) Field of Classification Search
`CPC . . . . . H04W 48 / 12 ; H04W 88 / 08 ; H04W 88 / 02 ;
`H04W 68 / 005 ; H04W 68 / 02
`See application file for complete search history .
`References Cited
`U . S . PATENT DOCUMENTS
`H04W 4 / 08
`8 , 934 , 926 B1 *
`1 / 2015 Greenberg
`455 / 418
`2009 / 0124245 Al 5 / 2009 Somasundaram et al .
`( Continued )
`FOREIGN PATENT DOCUMENTS
`10 - 2009 - 0096784
`9 / 2009
`OTHER PUBLICATIONS
`International Search Report dated Apr . 28 , 2015 in connection with
`International Application No . PCT / KR2015 / 001005 ; 6 pages .
`Primary Examiner — Thai Nguyen
`ABSTRACT
`( 57 )
`The present disclosure relates to a pre - 5th - Generation ( 5G )
`or 5G communication system to be provided for supporting
`higher data rates beyond 4 " - Generation ( 4G ) communica
`tion system such as long term evolution ( LTE ) . Provided is
`a method for processing System Information ( SI ) by a User
`Equipment ( UE ) in a mobile communication system . The
`method includes receiving , from a first base station ( BS ) ,
`information related to change of SI ; and waiting for recep
`tion of changed SI based on the information .
`
`KR
`
`6 Claims , 11 Drawing Sheets
`
`- 416
`UE2
`
`406
`VE1
`
`< - 400
`MeNB
`
`404
`SeNB 1
`
`414
`SeNB 2
`
`500a - 4 Monitor Paging
`Message
`
`Monitor Paging
`Message
`
`500b
`
`Paging Message Including SI
`Change Indication Information
`Paging Message Including Si Change Indication Information
`
`508b
`
`Determine whether
`Sl of SeNB in DC
`State is due to Change
`
`Determine whether - - 5082
`Sl of SeNB in DC
`State is due to Change
`
`Decide to Change ( or Update )
`Sl for Scell of SeNB1
`Change Indication Information of SI
`4 - 504
`506a
`506b
`
`- - - 502
`
`509 - -
`
`Recognize that
`SI of SeNB is not
`due to Change
`
`Broadcast Updated SI
`
`+ - 510
`
`Receive Updated SI - 512
`
` Ex. 1027
`APPLE INC. / Page 1 of 21
`
`

`

`US 10 , 237 , 810 B2
`Page 2
`
`( 56 )
`
`( 51 ) Int . Cl .
`H04W 68 / 02
`( 2009 . 01 )
`H04W 88 / 02
`( 2009 . 01 )
`H046 88 / 08
`( 2009 . 01 )
`References Cited
`U . S . PATENT DOCUMENTS
`2009 / 0181661 A1
`7 / 2009 Kitazoe et al .
`2012 / 0099464 AL
`4 / 2012 Chun et al .
`2013 / 0343270 Al
`12 / 2013 Abe et al .
`3 / 2016 Vannithamby . . . . . . . . H04W 4 / 005
`2016 / 0073326 A1 *
`370 / 312
`
`* cited by examiner
`
` Ex. 1027
`APPLE INC. / Page 2 of 21
`
`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 1 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 1 ]
`
`-
`
`-
`
`- L
`
`Updated SI
`
`
`
`- BCCH Modification Period N + 1 —
`
`102
`
`
`
`
`
`Change Notification for SI
`
`
`
`
`
`BCCH Modification Period N 100
`
` Ex. 1027
`APPLE INC. / Page 3 of 21
`
`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 2 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 2 ]
`
`Paging Group 4
`
`206
`
`Paging Group 3
`
`204
`
`Paging Group 2
`
`202
`
`200
`
`Paging Group 1
`
`
`
`SFN mod T = ( T div N ) * ( UEID mod T ) where N = min ( T , nB )
`
`
`
`12 - 70 - 15 16 17 - 23 124 125 - 32 31 | 32 - 3740 - 47 | 48 | 49 - 155 / 56 57 -
`
`
`
`Cycle ( T ) of UE = 32 Cell - Specific Loading Parameter ( nB ) = T14
`Paging
`
`0
`
` Ex. 1027
`APPLE INC. / Page 4 of 21
`
`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 3 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 3a ]
`
`Paging Group 4
`
`206
`
`Paging Group 3
`
`204
`
`Paging Group 2
`
`202
`
`200
`
`Paging Group 1
`
`
`
`Wake - up Period for Default Paging Cycle
`Additional
`
`
`
`Active DRX Period ( ON Period )
`
`3014
`
`0 1 / 2 ) - 70 - 1516 | 17 ) - 23 24 25 - 32 31 32 - 3740 - 47 | 48 | 49 - 55 | 56 | 57 -
`
`L
`
`-
`
`-
`
`
`
`302 306
`
`ON
`
`SLEEP
`
` Ex. 1027
`APPLE INC. / Page 5 of 21
`
`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 4 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 3b ]
`
`Paging Group 4
`
`206
`
`Paging Group 3
`
`204
`
`Paging Group 2
`
`202
`
`Paging Group 1
`
`200
`
`[ Fig . 41
`
`
`
`for Default Paging Cycle
`Additional Wake - up Period
`
`
`
`
`M Active DRX Period ( ON Period )
`
`314
`
`021 / 2 ) - - [ 7 10 . - 15 | 16 | 17 - 23 | 2 | | 25 ) - - 12 31 | 32 - 37 20 - 47 | 48 | 49 - 55 56 57 -
`
`316
`7 mm
`
`V
`
`ON
`
`SLEEP
`
`UE1
`
`406
`
`404
`
`MeNB
`
`SENB2
`
`UE2
`
`416
`
`414
`
` Ex. 1027
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`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 5 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 5 )
`414
`
`SeNB 2
`
`e ) - 502
`
`- 404
`SeNB 1
`
`- 504
`
`Decide to Change ( or Update ) Le
`
`Sl for Scell of SeNB1
`
`510
`
`
`
`Broadcast Updated SI
`
`
`
`Receive Updated si _ 512
`
`
`Recognize that SI of SeNB is not due to Change
`5097
`
`
`
`
`
`Paging Message Including SI Change Indication Information of SI
`
`
`
`
`
`506a
`
`+ 506b
`
`400
`
`MeNB
`
`416
`
`
`
`Change Indication Information
`
`
`
`
`Paging Message Including SI Change Indication Information
`Paging Message
`406
`å
`Monitor
`UE1
`
`
`
`Determine whether Determine whether Sl of SeNB in DC Sl of SeNB in DC
`Paging Message
`å
`Monitor
`VE2
`500
`
`500b
`
`508a
`
`
`
`State is due to Change State is due to Change
`
`5085
`
` Ex. 1027
`APPLE INC. / Page 7 of 21
`
`

`

`atent
`
`Mar . 19 , 2019
`
`Sheet 6 of 11
`
`US 10 , 237 , 810 B2
`
`- 612
`
`
`
`Broadcast Updated SI
`
`+ 606a
`t - 6066
`
`Paging Message Including Change Indication
`
`
`
`
`
`Information and Scell ID
`
`SI Change Indication
`
`- - 610
`
`[ Fig . 6 ]
`
`- 414
`SeNB 2
`
`s 404 SeNB 1
`
`Decide to Change ( or Update )
`
`SI for Scell of SeNB1
`
`E - 604
`
`Information of SI
`
`< 400
`
`MeNB
`
`( 406
`
`UE1
`
`416
`
`UE2
`
`602
`
`- 600b
`
`Message
`Monitor Paging
`
`
`Message
`Monitor Paging
`
`6000
`
`
`
`
`
`
`
`Paging Message Including Sl Change Indication Information and Scell ID
`
`
`
`
`
`
`
`h 614
`
`
`
`Receive Updated SI
`
`Recognize that Sl of SeNB1 is
`
`
`due to Change based on SI
`
`SeNB1 for Reception of Updated SI and Scell ID , and Monitor
`
`
`
`
`
`
`Change Indication Information
`
`
`Recognize that Sl of
`
`
`Information and Scell ID , and
`
`
`Stop Monitoring SeNB2
`
`based on SI Change Indication
`
`608b SeNB2 is not due to Change
`
` Ex. 1027
`APPLE INC. / Page 8 of 21
`
`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 7 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 7 ]
`
`702
`
`718 718
`
`UE1 UE3
`
`706
`
`MeNBA
`
`A
`SENDT
`704
`AL 716
`UE2
`SeNB2
`
`[ Fig . 8a ]
`
`714
`
`812
`
`
`SeNB2 Group 1 VE2 SI Change Notification Pattern for
`
`
`810
`
`
`SeNB1 Group 1 UE1 & UE3 SI Change Notification Pattern for
`
`
`
`
`
`
`BCCH Modification Period N + 1 —
`802
`
`
`
`
`
`BCCH Modification Period N -
`800
`
` Ex. 1027
`APPLE INC. / Page 9 of 21
`
`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 8 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 8b ]
`5714 SeNB 2
`
`704
`
`SeNB 1
`
`_ 828
`
`~ 834
`
`Decide to Change ( or Update ) SI for Scell of SeNB1
`
`Indication Information
`SI Change
`
`.
`
`826
`
`- 830
`
`N
`
`— 820a
`
`+ - 820b
`
`- 700 MeNB
`
`
`
`
`
`Broadcast Updated Sl for SeNB1
`
`
`
`
`
`Information about Patterns for Sl Change Notification
`
`
`
`
`
`
`
`
`
`
`Information about Patterns for SI Change Notification
`
`- 706 VE1
`
`716
`
`UE2
`
`822b
`
`Pattern 1 for SeNB2
`Obtain
`
`Broadcast Sl Change Notification in Subframe Corresponding to Pattern 1
`
`
`
`for SeNB2 Corresponding to 824b Obtained Pattern 1
`
`Monitor Sl Change Notification
`
`- 832
`
`for Reception of Updated SI
`
`
`
`
`SeNB1 and Wait Receive Si Change Notification for
`
`
`Obtained Pattern 2
`Monitor Sl Change Notification
`
`
`
`824a - 4 for SeNB2 Corresponding to
`
`Pattern 2 for SeNB2
`Obtain
`
`822a
`
` Ex. 1027
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`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 9 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 8c ]
`838
`
`r 714
`
`SENB 21
`
`704
`SeNB 1
`
`700
`
`MeNB
`
`- 706
`
`UE1
`
`716
`
`UE2
`
`Decide to Change ( or Update ) Sl for Scell of SeNB1
`
`- 840
`
`Indication Information
`SI Change
`
`1836
`
`Receive Updated Sl of SeNB1
`
`
`
`
`
`Broadcast Sl Change Notification in Subframe Corresponding to Pattern 2
`
`wait for Reception of Updated SI SeNB2 and
`
`Receive SI Change Notification for
`
`
`
`
`
`
`Broadcast Updated Sl for SeNB2
`
`
`
`Updated Sl for SeNB2 Receive
`
`846 - *
`
`844
`
`848 -
`
` Ex. 1027
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`

`

`atent
`
`Mar . 19 , 2019
`
`Sheet 10 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 9 ]
`
`906
`
`Pattern 4 of SeNB4
`
`904
`
`Pattern 3 of SeNB3
`
`902
`
`Pattern 2 of SeNB2
`
`900
`
`Pattern 1 of SeNB1
`
`[ Fig . 10 ]
`
`8
`
`612 - 17 . 00 - 15 / 10 17 - 12 / 23 - 12 / 31 | 2 - 3720 - 27 / 08 / 29 - 5 / 5 / 57 - -
`
`-
`
`-
`
`L
`
`-
`
`SLEEP
`
`
`
`
`
`
`Monitoring Period for SI Change Notification for MeNB
`
`
`
`
`
`
`
`SeNB Additional Monitoring Period for SI Change for
`
`
`
`
`
`Active DRX Cycle
`
`Controller
`
`1004
`
`1002
`
`Transmitter !
`Receiver
`
`1006
`
`- 1000
`
`DC State
`Determiner
`
` Ex. 1027
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`

`

`U . S . Patent
`
`Mar . 19 , 2019
`
`Sheet 11 of 11
`
`US 10 , 237 , 810 B2
`
`[ Fig . 11 ]
`
`MeNB
`
`Controller
`
`1104
`
`1102
`
`Transmitter /
`Receiver
`
`1106
`
`- 1100
`
`Change Notification
`Configuring Unit
`
`[ Fig . 12 ]
`
`SeNB
`
`1202
`
`Transmitter
`Receiver
`
`Controller
`
`| _ 1204
`
`Contarer I , 1204
`
`1200
`
`1206
`Update
`Decider
`
` Ex. 1027
`APPLE INC. / Page 13 of 21
`
`

`

`US 10 , 237 , 810 B2
`
`METHOD AND APPARATUS FOR
`PROCESSING SYSTEM INFORMATION IN
`COMMUNICATION SYSTEM
`
`TECHNICAL FIELD
`The present disclosure relates to a method and apparatus
`for processing System Information ( SI ) in a communication
`system .
`
`PRIORITY
`This application is a National Phase Entry of PCT Inter
`national Application No . PCT / KR2015 / 001005 , which was
`filed on Jan . 29 , 2015 , and claims a priority to Indian Patent
`Application No . 122 / KOL / 2014 , which was filed on Jan . 29 ,
`2014 , the contents of which are incorporated herein by
`reference .
`
`Accordingly , various aspects of the present disclosure
`provide a method and apparatus for processing System
`Information ( SI ) in a mobile communication system .
`Various aspects of the present disclosure also provide a
`5 method and apparatus for providing an SI change or update
`notification in a dual - connectivity - based mobile communi
`cation system .
`Other objects to be provided in the present disclosure may
`be understood by embodiments described below .
`According to an aspect of the present disclosure , there is
`provided a method for processing System Information ( SI )
`by a User Equipment ( UE ) in
`a mobile communication
`system , the method including receiving , from a first base
`station ( BS ) , information related to change of SI ; and
`waiting for reception of changed SI based on the informa
`15 tion .
`According to another aspect of the present disclosure ,
`there is provided a method for processing SI by a first BS in
`a mobile communication system , the method including
`receiving change notification of the SI from at least one
`20 second BS providing dual connectivity ( DC ) , together with
`BACKGROUND
`the first BS , to user equipments ( UEs ) located in a service
`coverage of the first BS ; and broadcasting a paging message
`comprising change indication information of the SI .
`To meet the demand for wireless data traffic having
`According to another aspect of the present disclosure ,
`increased since deployment of 4G ( 4th - Generation ) commu -
`nication systems , efforts have been made to develop an 25 there is provided a method for processing SI by a second BS
`improved 5G
`( 5th - Generation ) or pre - 5G communication
`in a mobile communication system , the method delivering
`change indication information of the SI to
`a first BS , if
`system . Therefore , the 5G or pre - 56 communication system
`deciding to change the Sl ; and changing and transmitting the
`is also called a “ beyond 4G network ’ or a ‘ post LTE system ' .
`SI , wherein the second BS is located in a service coverage
`The 5G communication system is considered to be imple
`of the first BS and provides dual connectivity ( DC ) to at least
`mented in higher frequency ( mm Wave ) bands , e . g . , 60 GHz 30 one user equipment ( UE ) located in the service coverage ,
`bands , so as to accomplish higher data rates . To decrease
`together with the first BS .
`propagation loss of the radio waves and increase the trans
`According to another aspect of the present disclosure ,
`mission distance , the beamforming , massive multiple - input
`there is provided a UE for processing SI in a mobile
`multiple - output ( MIMO ) , full dimensional MIMO ( FD -
`communication system , the UE including a transceiver
`MIMO ) , array antenna , an analog beam forming , large scale 35 configured to receive from a first base station ( BS ) , infor
`antenna techniques are discussed in 5G communication
`mation related to change of the SI ; and a controller config
`ured to control the receiver to wait for reception of changed
`systems .
`In addition , in 5G communication systems , development
`SI based on the information .
`According to another aspect of the present disclosure ,
`for system network improvement is under way based on
`advanced small cells , cloud radio access networks ( RANs ) , 40 there is provided a first BS for processing SI in a mobile
`communication system , the first BS comprising a transceiver
`ultra - dense networks , device - to - device ( D2D ) communica
`tion , wireless backhaul , moving network , cooperative com -
`is configured to receive change notification of Sl from at
`munication , coordinated multi - points ( COMP ) , reception in
`least one second BS providing dual connectivity ( DC ) ,
`together with the first BS , to at least one user equipment
`end interference cancellation and the like .
`In the 5G system . hybrid FSK and OAM modulation 45 ( UE ) located in a service coverage of the first BS ; and a
`controller configured to control the transceiver broadcasting
`( FQAM ) and sliding window superposition coding ( SWSC )
`a paging message comprising change indication information
`as an advanced coding modulation ( ACM ) , and filter bank
`of the SI .
`multi carrier ( FBMC ) , non - orthogonal multiple access
`According to another aspect of the present disclosure ,
`( NOMA ) , and sparse code multiple access ( SCMA ) as an
`there is provided a second BS for processing SI in a mobile
`advanced access technology have been developed .
`50 communication system , the second BS comprising a trans
`Due to an increase in communication capacity , mobile
`ceiver configured to deliver change indication information
`communication systems have employed various techniques ,
`of the SI to a first BS , if deciding to change the SI ; and a
`such as Carrier Aggregation ( CA ) for transmitting and
`controller configured to change and transmitting the SI ,
`receiving data through multiple cells , Dual Connectivity
`wherein the second BS is located in a service coverage of the
`( DC ) for providing data boosting using a macro cell and 55 first BS and provides dual connectivity ( DC ) to at least one
`user equipment ( UE ) located in the service coverage ,
`multiple pico cells , and so forth .
`The above information is presented as background infor -
`together with the first BS .
`Other aspects , advantages , and salient features of the
`mation only to assist with an understanding of the present
`disclosure . No determination has been made , and no asser -
`disclosure will become apparent to those skilled in the art
`tion is made , as to whether any of the above might be 60 from the following detailed description , which , taken in
`applicable as prior art with regard to the present disclosure .
`conjunction with the annexed drawings , discloses exemplary
`embodiments of the disclosure .
`SUMMARY
`BRIEF DESCRIPTION OF THE DRAWINGS
`The present disclosure has been made to at least partially 65
`The above and other aspects , features and advantages of
`solve , alleviate , or remove at least one of problems and / or
`disadvantages described above .
`embodiments of the present disclosure will be more apparent
`
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`

`US 10 , 237 , 810 B2
`
`15
`
`Thus , a User Equipment ( UE ) receives an MIB which is
`from the following detailed description taken in conjunction
`with the accompanying drawings , in which :
`transmitted at a pre - defined location and with pre - defined
`transmission parameters . The UE then receives SIB1 to
`FIG . 1 illustrates an example of an operation in which a
`obtain periodicities and scheduling information of the other
`legacy enhanced nodeB ( eNB ) transmits updated SI ;
`FIG . 2 illustrates an example of general paging cycle and 5 SIBs . Thereafter , the UE receives the other SIBs based on
`the information received in SIB1 .
`frames ;
`FIGS . 3a and 3b illustrate examples in which a User
`When deciding to update the SI , the eNB broadcasts the
`update or change notification for the SI in
`Equipment ( UE ) in a connected mode receives an Active
`a Broadcast
`Control Channel ( BCCH ) modification period and then from
`Mode DRX mode - based paging message ;
`FIG . 4 illustrates an example of a communication system
`10 the next BCCH modification period , broadcasts the updated
`for providing a DC according to an embodiment of the
`information . Hereinafter , ' update ' and ' change ' will be used
`as the same meaning .
`present disclosure ;
`FIG . 5 illustrates an example of an operation flow of an
`FIG . 1 illustrates an example of an operation in which a
`SI change notification according to an embodiment of the
`legacy eNB transmits updated SI .
`Referring to FIG . 1 , the eNB sends the change notification
`present disclosure ;
`FIG . 6 illustrates an example of an operation flow of an
`for the SI ( or the SI change notification ) by using all the
`SI change notification according to another embodiment of
`paging messages that the eNB sends in a BCCH modifica
`tion period n 100 . In this case , once receiving paging
`the present disclosure ;
`FIG . 7 illustrates another example of a communication
`messages , UEs in Radio Resource Control ( RRC ) IDLE and
`system for providing a DC according to an embodiment of 20 UEs in RRC _ CONNECTED may come to know SI updated
`in the next BCCH modification period ( n + 1 ) 102 . Although
`the present disclosure ;
`FIG . Sa illustrates an example of an SI change notification
`the UEs in RRC _ IDLE are expected to receive the paging
`message , the UEs in RRC _ CONNECTED may optionally
`pattern according to another embodiment of the present
`decode the paging message to obtain the SI change notifi
`disclosure ;
`FIGS . 8b and 8c illustrate an example of an operation flow 25 cation . As the paging message including the SI change
`of an SI update operation based on an SI change notification
`notification is broadcast , this may help the UEs to constantly
`pattern according to another embodiment of the present
`monitoring the SIB1 .
`In 3GPP Carrier Aggregation ( CA ) , the UE may be
`disclosure ;
`FIG . 9 illustrates an example of an SI change notification
`configured to transmit and receive data on multiple cells .
`pattern according to another embodiment of the present 30 Among the multiple cells , one cell may be configured as a
`Primary Cell ( Pcell ) while the other cells may be configured
`disclosure ;
`FIG . 10 illustrates an example of a UE according to an
`as Secondary Cells ( Scells ) . The SI monitoring of the UE is
`done for Pcell only . For Scell , SI is given via dedicated
`embodiment of the present disclosure ;
`FIG . 11 illustrates an example of an MeNB according to
`signaling when adding the Scell . When SI changes for Scell ,
`35 the SI is updated via an RRC Connection Reconfiguration
`an embodiment of the present disclosure ; and
`FIG . 12 illustrates an example of a SeNB according to an
`message .
`In a legacy 3GPP LTE system , the UE is given a paging
`embodiment of the present disclosure .
`Throughout the drawings , like reference numerals will be
`cycle determined in advance in Idle Mode . For example , the
`understood to refer to like parts , components , and structures .
`paging cycle may be 32 , 64 , 128 or 256 frames . If a paging
`40 cycle is not given , then a default paging cycle which is
`DETAILED DESCRIPTION
`broadcasted in SIB3 is used . A paging occasion frame is
`calculated by the UE , for example , based on Equation 1 .
`Hereinafter , operating principles of exemplary embodi
`( 1 ) ,
`SFN mod T = ( T div 1 ) * ( UEID mod T )
`ments of the present disclosure will be described in detail
`with reference to the accompanying drawings . Like compo - 45 5
`where T represents a paging cycle , N represents min ( T ,
`nB ) , and nB represents a cell specific loading parameter
`nents are referred to as like reference numerals although
`broadcast in SIB2 . Based on Equation 1 , each paging cycle
`being shown in different drawings , and a detailed description
`may be configured with subframes as given in Equation 2 .
`of well - known functions or structures will not be provided
`That is , a subframe unit forming a paging cycle may be 1 ,
`if it unnecessarily obscures the subject matter of the present
`disclosure . The following terms have been defined based on 50 2 , 4 , 8 , 10 , and 32 sub frames .
`0 , 1 , 2 , 3 , 4 , . . . All Frames
`their functions in the present disclosure and may change
`according to users ' or operators ' intention or custom . There
`0 , 2 , 4 , . . .
`fore , the definition of the terms should be made based on the
`specification .
`0 , 4 , 8 , 12 , . . .
`Hereinafter , a Generation Partnership Project ( GPP ) Long 55
`Term Evolution ( LTE ) system will be used only for illus
`0 , 8 , 16 , . . .
`tration for the sake of convenience , and embodiments of the
`0 , 16 , . . .
`present disclosure are equally applied to other mobile sys
`0 , 32 , 64 , . . . , 256 .
`tems . For example , in
`a 3rd GPP ( 3GPP ) LTE system ,
`( 2 )
`System Information ( SI ) is categorized as a block set known 60
`A subframe forming a paging cycle is decided by param
`as System Information Blocks ( SIBs ) and transmitted . The
`eters N , and paging subframes are predefined , such that one
`SI is periodically transmitted with different periodicities for
`of configurations of Equation 3 may be used .
`different SIBs . A special information block is defined as a
`Subframe 9
`Master Information Block ( MIB ) containing essential PHY
`information for receiving additional SI . SIB1 includes a 65
`Subframe 4 & 9
`value tag indicating a version of currently transmitted SI
`together with scheduling information of other SIBs .
`Subframe 0 , 4 , 5 , 9
`
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`

`US 10 , 237 , 810 B2
`
`un
`through the Pcell of the MeNB . SI for other cells is provided
`FIG . 2 illustrates an example of general paging cycle and
`to the UE through the Pcell through dedicated signaling .
`frames .
`However , one macro cell may be related to multiple pico
`Referring to FIG . 2 , for example , a total of four paging
`cells , such that this first method increases interaction
`groups are illustrated which satisfy conditions that a paging
`cycle T of a UE is 32 and a cell specific loading parameter 5 between eNBs that become more relevant to each other in
`nB is T / 4 . More specifically . Paging Group 1 200 includes
`DC . In this situation , the Pcell of the MeNB needs to ensure
`communication of SI change for all relevant cells to corre
`Oth subframe and 32nd subframe . Paging Group 2 202
`sponding UES .
`includes 8th subframe and 40th subframe . Paging Group 3
`The second method is to independently handle the SI . In
`204 includes 16th subframe and 48th subframe . Paging
`10 this case , the UE independently monitors SI of the MeNB
`Group 4 206 includes 24th subframe and 56th subframe .
`and SeNB cells . SI handling in the second method is
`The UE in the connected mode ( or connected mode UE )
`performed in each eNB , which means that SI for all cells of
`may operate based on an Active Mode Discontinuous
`the SeNB , that is , Scells and pScell , is broadcast to the UE
`Reception ( DRX ) mode to reduce power consumption . In
`through the pScell of the SeNB and SI for all Scells of the
`15 MeNB is broadcast to the UE through the Pcell of the
`the Active Mode DRX mode , the UE is configured with a
`cycle of ON / OFF periods in which data communication
`MeNB . This second method increases complexity at the UE
`happens in the ON period . In such a situation , a paging
`because the UE needs to independently monitor SI for the
`MeNB and SI for the SeNB and to track the SI change for
`frame / subframe may or may not fall during the ON duration .
`FIGS . 3a and 3b illustrate examples in which the connected
`the MeNB and SeNB cells . In addition , as the UE first needs
`mode UE receives an Active Mode DRX mode - based paging 20 to receive SIB1 and SIB2 , it may take additional time to add
`message . Referring to FIGS . 3a and 3b , assuming that the
`SeNB ( pScell ) . Therefore , a need exists for a DC - based SI
`UE cannot receive any paging during its ON period , the UE
`handling method for reducing load increased by the use of
`may further use a default paging cycle in addition to
`the first method and UE complexity increased by the use of
`DRX - based ON periods 302 and 304 . In this case , the UE
`the second method .
`may additionally wake up in a default paging period 306 25
`Hence , an embodiment of the present disclosure proposes
`corresponding to the default paging cycle . According to
`a method for efficiently handling SI in a DC - based mobile
`another embodiment , the UE may monitor all possible
`communication system .
`FIG . 4 illustrates an example of a communication system
`paging frames . Referring to FIG . 3B according to another
`for providing a DC according to an embodiment of the
`embodiment of the present disclosure , the UE may monitor
`a frame 316 nearest to an ON period 312 for monitoring a 30 30 present disclosure .
`Referring to FIG . 4 , for example , it is assumed that two
`SI change notification . According to another embodiment of
`SeNBs 404 and 414 , UE1 406 , and UE2 416 exist in a cell
`the present disclosure , the UE may ignore the SI change
`402 of MeNB 400 . Then , UE1 406 is in a Dual Connectivity
`notification monitoring the paging message and instead may
`( DC ) state with MeNB 400 and SeNB1 404 and UE2 416 is
`continuously monitor SIB1 for detecting SI version change . ,
`nange . 35 in a DC state with MeNB 400 and SeNB2 414 . A UE
`All these methods cause complexity at the UE .
`according to another embodiment of the present disclosure
`A UE based on Dual Connectivity ( DC ) which is being
`and another UE in a non - DC state in a Scell of a DC - state
`standardized may simultaneously be connected to eNB
`Ne
`( MeNB ) of a macro cell and a Secondary eNB ( SeNB ) of a
`Hereinafter in an embodiment of the present disclosure
`pico cell . The primary motivation of dual connectivity is 40 a change notification for SI of a SeNB Scell is broadcast to
`data boosting by using a large number of picocells in
`UEs through a MeNB Pcell . It is assumed that a SeNB cell
`hotspots . But this leads to highly decreased mobility robust -
`in a MeNB decides to change SI . Then , the SeNB delivers
`ness as the UE may need to perform frequent handovers due
`a change notification for the SI to the MeNB , and the MeNB
`to small size of the picocells . In order to overcome this issue ,
`incorporates the SI change notification into paging messages
`the architecture of DC is used in which the mobility is 45 to be transmitted in a corresponding BCCH modification
`handled by the umbrella macrocell . In this new architecture
`period . UEs having received the SI change notification for
`of DC , a UE may be allocated an uplink data channel in both
`the Scell from the SeNB monitors SIBs for the Scell of its
`the MeNB and the SeNB . The MeNB is considered as a
`SeNB in the DC state in the next BCCH modification period .
`controller for many control plane functionalities , but the
`The UE monitors the SI for cells of the MeNB and obtains
`data plane is largely independently performed in each eNB . 50 SI for all Scells of the MeNB through the Pcell of the MeNB .
`The main reason being that an inter eNB communication
`According to an embodiment of the present disclosure , the
`delay is much higher than the typical scheduling interval .
`change notification incorporated into the paging messages
`The inter eNB communication incurs a delay of 2 - 60 ms by the MeNB indicates change of SI of the SeNB only , and
`which is higher than a scheduling delay of about 1 ms .
`the change notification may be indicated by , for example , an
`Hence , the eNB performs its own scheduling . The eNB 55 1 - bit indicator . Thus , the change notification does not indi
`performing its own scheduling may also be considered as
`cate an identifier of the SeNB whose SI is due to change .
`Inter - eNB Carrier Aggregation . Further in DC , cells served
`Thus , upon receiving a paging message from the MeNB , the
`by the MeNB are referred to as a Pcell group and one of cells
`connected mode UEs the paging message and determine
`of the Pcell group of the MeNB is defined as a Pcell . Cells
`whether the paging message includes the change notifica
`served by the SeNB are referred to as a Scell group and one 60 tion . If determining that the received paging message
`of cells included in the Scell group is defined as a Pcell of
`includes the change notification , the UEs monitor all Scells
`of the SeNB which is in the DC state with the UEs or pScell
`the Scell group , which will be referred to as a pScell .
`Several methods are under discussion for the update of the
`of the SeNB , because the UEs cannot identify the SeNB
`SI of the SeNB . First , the update of the SI of the SeNB may
`whose SI is due to change .
`be handled in the same manner as legacy CA . In this case , 65
`Substantially , even if SI for one Scell has changed , all
`in the same manner as legacy CA , SI for all cells included
`connected mode UEs which are in the DC state with one cell
`in the SeNB , that is Scells and pScells , is delivered to the UE
`of the MeNB as a Pcell may monitor the pScell of the MeNB
`
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`US 10 , 237 , 810 B2
`
`SI is due to be updated , such that overhead may be increased
`in the DC state with the UEs to determine whether the SI has
`when compared to the paging message according to an
`changed . The UEs decode SIB1 of the corresponding SeNB
`embodiment of the present disclosure . On the other hand ,
`to match the current version of the SI with the version of the
`only UEs in the DC state with the SeNB corresponding to
`stored SI . If the stored version and the current version are
`different , the UEs may recognize that the SI of the SeNB has 5 the Scell ID perform monitoring , thereby preventing other
`changed or has been updated .
`UEs from unnecessarily monitoring the updated SI .
`FIG . 5 illustrates an example of an operation flow of an
`FIG . 6 illustrates an example of an operation flow of an
`SI change notification according to an embodiment of the
`SI change notification according t