KAN MATA NA MATA NATIN
`WA MALI MALTA AL CANI A
`US 20170332372A1
`( 19 ) United States
`( 12 ) Patent Application Publication ( 10 ) Pub . No . : US 2017 / 0332372 A1
`( 43 ) Pub . Date :
`Nov . 16 , 2017
`Lee et al .
`
`( 72 )
`
`( 54 ) METHOD AND APPARATUS FOR
`REQUESTING ADDITIONAL SYSTEM
`INFORMATION
`( 71 ) Applicant : LG ELECTRONICS INC . , Seoul
`( KR )
`Inventors : Youngdae Lee , Seoul ( KR ) ; Sangwon
`Kim , Seoul ( KR ) ; Jaewook Lee , Seoul
`( KR )
`( 21 ) Appl . No . : 15 / 590 , 644
`( 22 ) Filed :
`May 9 , 2017
`Related U . S . Application Data
`( 60 ) Provisional application No . 62 / 334 , 418 , filed on May
`10 , 2016 , provisional application No . 62 / 334 , 427 ,
`filed on May 10 , 2016 , provisional application No .
`62 / 334 , 443 , filed on May 10 , 2016 .
`Publication Classification
`
`( 51 ) Int . Ci .
`H04W 72 / 04
`H04W 72 / 04
`
`( 2009 . 01 )
`( 2009 . 01 )
`
`( 2009 . 01 )
`( 2009 . 01 )
`
`H04W 72 / 08
`H04W 72 / 08
`U . S . CI .
`CPC . . . . . H04W 72 / 0413 ( 2013 . 01 ) ; H04W 72 / 087
`( 2013 . 01 ) ; H04W 72 / 042 ( 2013 . 01 ) ; H04W
`72 / 085 ( 2013 . 01 )
`
`ABSTRACT
`
`( 52 )
`
`( 57 )
`
`Provided are a method for a user equipment ( UE ) to request
`additional system information in a wireless communication
`system , and an apparatus supporting the same . The method
`may include : transmitting a first uplink message including a
`system information request to a radio access network
`( RAN ) ; receiving a
`first downlink message including
`requested system information from the RAN in response to
`the system information request ; transmitting a second uplink
`message including an additional system information request
`to the RAN ; and receiving requested additional system
`information from the RAN in response to the additional
`system information request .
`
`MME / S - GW
`
`30
`
`MME / S - GW
`AN
`
`30
`
`si
`20 _ *
`
`si
`
`51 /
`
`51
`
`> E - UTRAN
`
`10
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 1 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 1
`
`MME / S - GW
`
`MME / S - GW
`
`- 30
`
`30 30
`
`| s1
`
`i
`
`s1
`
`s1
`
`s1
`
`- 20
`
`> E - UTRAN
`
`y BS
`X2
`
`BS
`
`BS
`
`UE
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 2 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 2
`
`-
`
`-
`
`-
`
`-
`
`-
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`-
`
`-
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`-
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`-
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`-
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`-
`
`1 BS
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`- -
`
`RRC
`
`PDCP
`
`-
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`-
`
`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`UE
`
`-
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`- - - - - - - - - - -
`
`- - - - -
`
`- - - - - - - - -
`
`- - -
`
`- - - - -
`
`NAS
`
`RRC
`
`PDCP
`
`-
`
`-
`
`-
`
`-
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`-
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`-
`
`-
`
`-
`
`-
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`-
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`-
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`-
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`-
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`-
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`-
`
`MME
`
`NAS
`
`-
`
`- -
`
`- - - - - - - - -
`
`- - - -
`
`- - - - - - - - -
`
`- - - -
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`-
`
`- - - - - - -
`
`RLC
`
`MAC
`
`PHY
`
`- - - - - -
`
`-
`
`- - - -
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`RLC
`
`MAC
`
`PHY
`
`- - - - - - - -
`
`- - - - - - - - - -
`
`- - -
`
`- -
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`- -
`
`- - - -
`
`- -
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`- -
`
`L
`
`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`- - - - - - - - -
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`- - -
`
`- - - - - -
`
`- -
`
`

`

`Patent Application Publication
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`Nov . 16 , 2017 Sheet 3 of 17
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`US 2017 / 0332372 A1
`
`FIG . 3
`
`UE
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`BS
`
`- -
`
`- -
`
`- -
`
`-
`
`- - -
`
`-
`
`-
`
`-
`
`- -
`
`- - -
`
`-
`
`- -
`
`PDCP
`
`RLC
`
`MAC
`
`PHY
`
`-
`
`-
`
`-
`
`-
`
`PDCP
`
`RLC
`
`MAC
`
`PHY
`
`L
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
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`-
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`-
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`- -
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
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`-
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 4 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 4
`
`UE UE
`
`NETWORK
`
`RRC Connection Request
`
`RRC Connection Setup
`
`RRC Connection Setup Complete
`
`5410
`
`5420
`
`S430
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 5 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 5
`
`UE
`
`NETWORK
`
`RRC Connection Reconfiguration
`
`RRC Connection Reconfiguration Complete L
`
`5510
`
`eon
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 6 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 6
`
`( START )
`
`.
`
`RRC connection state
`
`stopping use of all RB ( except for SRB 0 ) ,
`and initializing AS layer
`
`performing a cell selection
`
`determining whether or
`not a selected cell is suitable
`
`S610
`
`5620
`
`5630
`
`selecting a suitable E - UTRAN cell ?
`
`NO
`
`YES
`
`transmitting RRC connection
`re - establishment request message
`
`S640
`
`receiving RRC connection
`re - establishment message ?
`
`NO
`
`entering RRC idle state L
`
`YES
`transmitting RRC connection
`re - establishment complete message 15660
`CEND
`
`END
`
`5650
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 7 of 17
`
`US 2017 / 0332372 A1
`
`. . .
`WW
`
`. WIZ VA ZA
`
`
`
`
`
`MV IZ
`
`MW
`
`FIG . 7
`
`
`
`WZZZA MW
`
`777
`
`NII
`
`LAWW WZZZ
`
`80ms
`ANT
`
`- - - AX _ ZZ _ ZZA .
`
`TZA
`
`SIB1 ( T = 80ms )
`S1 - 3 ( T = 320ms ) SI - 4 ( T = 640ms )
`SI - 2 ( T = 160ms )
`
`SI - 5 ( T = 1280ms ) N
`
`?????? SIBx
`
`??????
`
`( SI repetition in each Sl window ) Sl window
`
`SEN = 1
`
`1
`
`L L L 1 1 1 TIL TIL I
`
`T L
`
`II III 1 1 1
`
`10ms
`
`SEN = 0
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 8 of 17
`
`US 2017 / 0332372 A1
`
`
`
`
`
`BCCH modification period ( n + 1 )
`
`N N N
`
`
`
`
`
`Transmit new system information
`
`FIG . 8
`
`N
`
`-
`
`-
`
`
`
`
`
`BCCH modification period ( n )
`
`N N N
`
`
`
`
`
`
`
`Notify system information change
`
`N
`
`-
`
`-
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 9 of 17
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`US 2017 / 0332372 A1
`
`FIG . 9
`
`Core network
`
`RAN - CN
`interface
`
`+
`
`gNB H +
`
`Inter - BS
`interface
`
`gNBHH ELTE
`
`eNB
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 10 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 10
`
`Core network
`
`RAN - CN
`interface -
`
`Site A
`
`Site B
`
`E - UTRA New Radio
`
`E - UTRA New Radio
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 11 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 11
`
`Core network
`
`RAN - CN
`interface
`
`Central unit
`( upper layer of gNB )
`
`Distributed unit
`( lower layer of gNB )
`
`Distributed unit
`( lower layer of GNB )
`
`

`

`Patent Application Publication
`
`application Publicatio
`
`Nov . 16 , 2017 Sheet 12 of 17
`
`US 2017 / 0332372 A1
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`FIG . 12
`
`UE
`
`RAN
`
`system information request
`
`requested system information
`
`MS1210
`
`- S1220
`
`additional system information request AS1230
`
`requested additional system information on
`
`on
`51240
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 13 of 17
`
`US 2017 / 0332372 A1
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`FIG . 13
`
`UE
`
`RAN
`
`RRC connection request
`( including system information request )
`
`_
`
`_ 51310
`
`RRC connection setup
`( including requested system information ) _ d51320
`RRC connection setup complete
`( including additional system information request ) "
`
`51330
`
`requested additional system information
`
`d51340
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 14 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 14
`
`UE
`
`RAN
`
`RRC connection resume request
`( including system information request )
`
`RRC connection resume
`( including requested system information ) -
`
`RRC connection resume complete
`( including additional system information request ) d
`
`S1410
`
`51420
`
`requested additional system information -
`
`51440
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 15 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 15
`
`UE UE
`
`RRC connection re - establishment request
`( including system information request )
`
`RAN
`
`S1510
`
`RRC connection re - establishment
`( including requested system information ) A51520
`
`RRC connection re - establishment complete
`( including additional system information request ) t51530
`
`requested additional system information 451540
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 16 of 17
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`US 2017 / 0332372 A1
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`FIG . 16
`
`( START
`
`transmit first uplink message including
`system information request to RAN
`
`receive first downlink message including
`requested system information from
`RAN in response to system information request
`
`transmit second uplink message including
`additional system information request to RAN
`
`receive requested additional system
`information from RAN in response to
`additional system information request
`
`END
`
`S1610
`
`S1620
`
`51630
`
`$ 1640
`
`

`

`Patent Application Publication
`
`Nov . 16 , 2017 Sheet 17 of 17
`
`US 2017 / 0332372 A1
`
`FIG . 17
`
`1700
`
`1710
`
`1701
`1701
`
`1703 V
`1703
`
`1713
`
`1711
`
`processor
`
`transceiver
`
`transceiver
`
`processor
`
`1702
`
`memory
`
`memory
`
`

`

`US 2017 / 0332372 A1
`
`Nov . 16 , 2017
`
`METHOD AND APPARATUS FOR
`REQUESTING ADDITIONAL SYSTEM
`INFORMATION
`CROSS - REFERENCE TO RELATED
`APPLICATIONS
`[ 0001 ] Pursuant to 35 U . S . C . $ 119 ( e ) , this application
`claims the benefit of U . S . Provisional Applications No .
`62 / 334 , 418 , filed on May 10 , 2016 , No . 62 / 334 , 427 , filed on
`May 10 , 2016 and No . 62 / 334 , 443 , filed on May 10 , 2016 ,
`the contents of which are all hereby incorporated by refer
`ence herein in their entirety .
`BACKGROUND OF THE INVENTION
`Field of the Invention
`[ 0002 ] The present invention relates to a wireless com
`munication system , and more particularly , to a method for a
`user equipment ( UE ) to request additional system informa
`tion and an apparatus supporting the same .
`Related Art
`In order to meet the demand for wireless data
`[ 0003 ]
`traffic , which has been increasing since the commercializa
`tion of a fourth - generation ( 4G ) communication system ,
`efforts are being made to develop an improved fifth - genera
`tion ( 5G ) communication system or pre - 5G communication
`system . For this reason , a 5G communication system or
`pre - 56 communication system is referred to as a beyond
`4G - network communication system or post - long - term evo
`lution ( LTE ) system .
`10004 ]
`To achieve a high data transmission rate , imple
`menting a 5G communication system in an extremely high
`frequency ( mm Wave ) band ( for example , a 60 GHz band ) is
`being considered . To relieve the path loss of signals and to
`increase the transmission distance of signals in an extremely
`high frequency band , beamforming , massive multiple - input
`and multiple - output ( massive MIMO ) , full dimensional
`MIMO ( FD - MIMO ) , array antenna , analog beamforming ,
`and large - scale antenna techniques are under discussion for
`a 5G communication system .
`[ 0005 ] Further , to improve the network of the system ,
`technical development in an evolved small cell , an advanced
`small cell , a cloud radio access network ( cloud RAN ) , an
`ultra - dense network , device - to - device ( D2D ) communica
`tion , wireless backhaul , a moving network , cooperative
`communication , coordinated multi - points ( COMP ) , and
`interference cancellation is progressing for the 5G commu
`nication system .
`[ 0006 ]
`In addition , an advanced coding modulation
`( ACM ) scheme including hybrid frequency shift keying
`( FSK ) and quadrature amplitude modulation ( FQAM ) and
`sliding window superposition coding ( SWSC ) and an
`advanced access technique including filter bank multi carrier
`( FBMC ) , non - orthogonal multiple access ( NOMA ) , and
`sparse code multiple access ( SCMA ) are being developed in
`the 5G system .
`10007 ]
`System information refers to essential information
`for communications between a user equipment ( UE ) and a
`base station ( BS ) . In 3GPP LTE , system information is
`divided into a master information block ( MIB ) and a system
`information block ( SIB ) . The MIB is the most essential
`information , and the SIB is subdivided into SIBs - x accord -
`
`ing to importance or period . The MIB is transmitted through
`a physical broadcast channel ( PBCH ) that is a physical
`channel , while the SIB is transmitted as common control
`information through a PDCCH .
`SUMMARY OF THE INVENTION
`The number of system information blocks ( SIBs ) is
`[ 0008 ]
`steadily increasing . As the use of radio resources is needed
`to broadcast SIBs , an increase in the number of SIBs
`inevitably leads to an increase in the quantity of radio
`resources needed to broadcast SIBs . In transmitting a con
`stantly increasing number of SIBs to a user equipment ( UE ) ,
`it is necessary to propose a system information acquiring
`method using efficiently utilizing radio resources .
`[ 0009 ] One embodiment provides a method for a UE to
`request additional system information in a wireless commu
`nication system . The method may include : transmitting a
`first uplink message including a system information request
`to a radio access network ( RAN ) ; receiving a first downlink
`message including requested system information from the
`RAN in response to the system information request ; trans
`mitting a second uplink message including an additional
`system information request to the RAN ; and receiving
`requested additional system information from the RAN in
`response to the additional system information request .
`Transmission of the system information request may be
`initiated by a radio link failure ( RLF ) . Transmission of the
`system information request may be initiated by a handover
`failure ( HOF ) . Transmission of the system information
`request may be initiated by a service request for a mobile
`originating ( MO ) signaling , MO call or mobile terminating
`( MT ) call . Transmission of the system information request
`may be initiated by a tracking area update or an attach
`request .
`[ 0010 ] When the first uplink message has a size which is
`not sufficient to include the additional system information
`request , the additional system information request may be
`transmitted to the RAN via the second uplink message .
`[ 0011 ]
`The system
`information request may further
`include information indicating that the additional system
`information request is to be transmitted .
`[ 0012 ] The system information received by the system
`information request may be system information set higher in
`priority than the additional system information received by
`the additional system information request .
`[ 0013 ] The first uplink message may be a radio resource
`control ( RRC ) connection request message , the first down
`link message may be an RRC connection setup message , and
`the second uplink message may be an RRC connection setup
`complete message .
`[ 0014 ] . The first uplink message may be an RRC connec
`tion resume request message , the first downlink message
`may be an RRC connection resume message , and the second
`uplink message may be an RRC connection resume com
`plete message .
`[ 0015 ] The first uplink message may be an RRC connec
`tion re - establishment request message , the first downlink
`message may be an RRC connection re - establishment mes
`sage , and the second uplink message may be an RRC
`Connection re - establishment complete message .
`[ 0016 ] Another embodiment provides a UE requesting
`additional system information in a wireless communication
`system . The UE may include : a memory ; a transceiver , and
`a processor configured to connect the memory and the
`
`

`

`US 2017 / 0332372 A1
`
`Nov . 16 , 2017
`
`transceiver , wherein the processor may be configured to
`control the transceiver to : transmit a first uplink message
`comprising a system information request to a radio access
`network ( RAN ) ; receive a first downlink message compris
`ing requested system information from the RAN in response
`to the system information request ; transmit a second uplink
`message comprising an additional system information
`request to the RAN ; and receive requested additional system
`information from the RAN in response to the additional
`system information request .
`BRIEF DESCRIPTION OF THE DRAWINGS
`[ 0017 )
`FIG . 1 shows LTE system architecture .
`[ 0018 ] FIG . 2 shows a control plane of a radio interface
`protocol of an LTE system .
`[ 0019 ] FIG . 3 shows a user plane of a radio interface
`protocol of an LTE system .
`[ 0020 ]
`FIG . 4 shows an RRC connection establishment
`procedure .
`[ 0021 ] FIG . 5 shows an RRC connection reconfiguration
`procedure .
`[ 0022 ] FIG . 6 shows an RRC connection re - establishment
`procedure .
`[ 0023 ]
`FIG . 7 illustrates an example of transmitting a
`master information block ( MIB ) , system information block1
`( SIB1 ) , and other SIBs .
`[ 0024 ]
`FIG . 8 illustrates an update of system information .
`[ 0025 ]
`FIG . 9 illustrates a non - centralized deployment .
`[ 0026 ] FIG . 10 illustrates a co - sited deployment with
`E - UTRA .
`[ 0027 ] FIG . 11 illustrates a centralized deployment
`[ 0028 ] FIG . 12 illustrates a procedure in which a UE
`requests additional system information according to an
`embodiment of the present invention .
`[ 0029 ] FIG . 13 illustrates a procedure in which a UE
`requests additional system information through an RRC
`connection establishment procedure according to
`an
`embodiment of the present invention .
`[ 0030 ] FIG . 14 illustrates a procedure in which a UE
`requests additional system information through an RRC
`connection resume procedure according to an embodiment
`of the present invention .
`[ 0031 ] FIG . 15 illustrates a procedure in which a UE
`requests additional system information through an RRC
`connection re - establishment procedure according to an
`embodiment of the present invention .
`10032 ] FIG . 16 is a block diagram illustrating a method for
`a UE to request additional system information according to
`an embodiment of the present invention .
`[ 0033 ] FIG . 17 is a block diagram illustrating a wireless
`communication system according to the embodiment of the
`present invention .
`DESCRIPTION OF EXEMPLARY
`EMBODIMENTS
`The technology described below can be used in
`[ 0034 ]
`various wireless communication systems such as code divi
`sion multiple access ( CDMA ) , frequency division multiple
`access ( FDMA ) , time division multiple access ( TDMA ) ,
`orthogonal frequency division multiple access ( OFDMA ) ,
`single carrier frequency division multiple access ( SC
`FDMA ) , etc . The CDMA can be implemented with a radio
`technology such as universal terrestrial radio access ( UTRA )
`
`or CDMA - 2000 . The TDMA can be implemented with a
`radio technology such as global system for mobile commu
`nications ( GSM ) / general packet ratio service ( GPRS ) / en
`hanced data rate for GSM evolution ( EDGE ) . The OFDMA
`can be implemented with a radio technology such as institute
`of electrical and electronics engineers ( IEEE ) 802 . 11 ( Wi
`Fi ) , IEEE 802 . 16 ( WiMAX ) , IEEE 802 . 20 , evolved UTRA
`( E - UTRA ) , etc . IEEE 802 . 16m is evolved from IEEE 802 .
`16e , and provides backward compatibility with a system
`based on the IEEE 802 . 16e . The UTRA is a part of a
`universal mobile telecommunication system ( UMTS ) . 3rd
`generation partnership project ( 3GPP ) long term evolution
`( LTE ) is a part of an evolved UMTS ( E - UMTS ) using the
`E - UTRA . The 3GPP LTE uses the OFDMA in a downlink
`and uses the SC - FDMA in an uplink . LTE - advanced ( LTE
`A ) is an evolution of the LTE . 5G communication system is
`an evolution of the LTE - A .
`[ 0035 ] For clarity , the following description will focus on
`LTE - A . However , technical features of the present invention
`are not limited thereto .
`10036 ]
`FIG . 1 shows LTE system architecture . The com
`munication network is widely deployed to provide a variety
`of communication services such as voice over internet
`protocol ( VoIP ) through IMS and packet data .
`[ 0037 ] Referring to FIG . 1 , the LTE system architecture
`includes one or more user equipment ( UE ; 10 ) , an evolved
`UMTS terrestrial radio access network ( E - UTRAN ) and an
`evolved packet core ( EPC ) . The UE 10 refers to a commu
`nication equipment carried by a user . The UE 10 may be
`fixed or mobile , and may be referred to as another termi
`nology , such as a mobile station ( MS ) , a user terminal ( UT ) ,
`a subscriber station ( SS ) , a wireless device , etc .
`[ 0038 ] The E - UTRAN includes one or more evolved
`node - B ( eNB ) 20 , and a plurality of UEs may be located in
`one cell . The eNB 20 provides an end point of a control
`plane and a user plane to the UE 10 . The eNB 20 is generally
`a fixed station that communicates with the UE 10 and may
`be referred to as another terminology , such as a base station
`( BS ) , a base transceiver system ( BTS ) , an access point , etc .
`One eNB 20 may be deployed per cell . There are one or
`more cells within the coverage of the eNB 20 . A single cell
`is configured to have one of bandwidths selected from 1 . 25 ,
`2 . 5 , 5 , 10 , and 20 MHz , etc . , and provides downlink or
`uplink transmission services to several UEs . In this case ,
`different cells can be configured to provide different band
`widths .
`10039 ] Hereinafter , a downlink ( DL ) denotes communica
`tion from the eNB 20 to the UE 10 , and an uplink ( UL )
`denotes communication from the UE 10 to the eNB 20 . In
`the DL , a transmitter may be a part of the eNB 20 , and a
`receiver may be a part of the UE 10 . In the UL , the
`transmitter may be a part of the UE 10 , and the receiver may
`be a part of the eNB 20 .
`[ 0040 ]
`The EPC includes a mobility management entity
`( MME ) which is in charge of control plane functions , and a
`system
`architecture evolution ( SAE ) gateway ( S - GW )
`which is in charge of user plane functions . The MME / S - GW
`30 may be positioned at the end of the network and con
`nected to an external network . The MME has UE access
`information or UE capability information , and such infor
`mation may be primarily used in UE mobility management .
`The S - GW is a gateway of which an endpoint is an
`E - UTRAN . The MME / S - GW 30 provides an end point of a
`session and mobility management function for the UE 10 .
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`The EPC may further include a packet data network ( PDN )
`gateway ( PDN - GW ) . The PDN - GW is a gateway of which
`an endpoint is a PDN .
`[ 0041 ] The MME provides various functions including
`non - access stratum ( NAS ) signaling to eNBs 20 , NAS
`signaling security , access stratum ( AS ) security control ,
`Inter core network ( CN ) node signaling for mobility
`between 3GPP access networks , idle mode UE reachability
`( including control and execution of paging retransmission ) ,
`tracking area list management ( for UE in idle and active
`mode ) , P - GW and S - GW selection , MME selection for
`handovers with MME change , serving GPRS support node
`( SGSN ) selection for handovers to 2G or 3G 3GPP access
`networks , roaming , authentication , bearer management
`functions including dedicated bearer establishment , support
`for public warning system ( PWS ) ( which includes earth
`quake and tsunami warning system ( ETWS ) and commercial
`mobile alert system ( CMAS ) ) message transmission . The
`S - GW host provides assorted functions including per - user
`based packet filtering ( by e . g . , deep packet inspection ) ,
`lawful interception , UE Internet protocol ( IP ) address allo
`cation , transport level packet marking in the DL , UL and DL
`service level charging , gating and rate enforcement , DL rate
`enforcement based on APN - AMBR . For clarity MME / S
`GW 30 will be referred to herein simply as a “ gateway , ” but
`it is understood that this entity includes both the MME and
`S - GW .
`Interfaces for transmitting user traffic or control
`[ 0042 ]
`traffic may be used . The UE 10 and the eNB 20 are
`connected by means of a Uu interface . The eNBs 20 are
`interconnected by means of an X2 interface . Neighboring
`eNBs may have a meshed network structure that has the X2
`interface . The eNBs 20 are connected to the EPC by means
`of an S1 interface . The eNBs 20 are connected to the MME
`by means of an S1 - MME interface , and are connected to the
`S - GW by means of S1 - U interface . The S1 interface sup
`ports a many - to - many relation between the eNB 20 and the
`MME / S - GW .
`[ 0043 ]
`The eNB 20 may perform functions of selection for
`gateway 30 , routing toward the gateway 30 during a radio
`resource control ( RRC ) activation , scheduling and transmit
`ting of paging messages , scheduling and transmitting of
`broadcast channel ( BCH ) information , dynamic allocation
`of resources to the UEs 10 in both UL and DL , configuration
`and provisioning of eNB measurements , radio bearer con
`trol , radio admission control ( RAC ) , and connection mobil
`ity control in LTE _ ACTIVE state . In the EPC , and as noted
`above , gateway 30 may perform functions of paging origi
`nation , LTE _ IDLE state management , ciphering of the user
`plane , SAE bearer control , and ciphering and integrity
`protection of NAS signaling .
`[ 0044 ] FIG . 2 shows a control plane of a radio interface
`protocol of an LTE system . FIG . 3 shows a user plane of a
`radio interface protocol of an LTE system .
`[ 0045 ] Layers of a radio interface protocol between the
`UE and the E - UTRAN may be classified into a first layer
`( L1 ) , a second layer ( L2 ) , and a third layer ( L3 ) based on the
`lower three layers of the open system interconnection ( OSI )
`model that is well - known in the communication system . The
`radio interface protocol between the UE and the E - UTRAN
`may be horizontally divided into a physical layer , a data link
`layer , and a network layer , and may be vertically divided
`into a control plane ( C - plane ) which is a protocol stack for
`control signal transmission and a user plane ( U - plane ) which
`
`is a protocol stack for data information transmission . The
`layers of the radio interface protocol exist in pairs at the UE
`and the E - UTRAN , and are in charge of data transmission of
`the Uu interface .
`[ 0046 ]
`A physical ( PHY ) layer belongs to the Ll . The
`PHY layer provides a higher layer with an information
`transfer service through a physical channel . The PHY layer
`is connected to a medium access control ( MAC ) layer , which
`is
`a higher layer of the PHY layer , through a transport
`channel A physical channel is mapped to the transport
`channel . Data is transferred between the MAC layer and the
`PHY layer through the transport channel . Between different
`PHY layers , i . e . , a PHY layer of a transmitter and a PHY
`layer of a receiver , data is transferred through the physical
`channel using radio resources . The physical channel is
`modulated using an orthogonal frequency division multi
`plexing ( OFDM ) scheme , and utilizes time and frequency as
`a radio resource .
`[ 0047 ] The PHY layer uses several physical control chan
`nels . A physical downlink control channel ( PDCCH ) reports
`to a UE about resource allocation of a paging channel ( PCH )
`and a downlink shared channel ( DL - SCH ) , and hybrid
`automatic repeat request ( HARQ ) information related to the
`DL - SCH . The PDCCH may carry a UL grant for reporting
`to the UE about resource allocation of UL transmission . A
`physical control format indicator channel ( PCFICH ) reports
`the number of OFDM symbols used for PDCCHs to the UE ,
`and is transmitted in every subframe . A physical hybrid ARQ
`indicator channel ( PHICH ) carries an HARQ acknowledge
`ment ( ACK ) / non - acknowledgement ( NACK ) signal in
`response to UL transmission . A physical uplink control
`channel ( PUCCH ) carries UL control information such as
`HARQ ACK / NACK for DL transmission , scheduling
`request , and CQI . A physical uplink shared channel
`( PUSCH ) carries a UL - uplink shared channel ( SCH ) .
`[ 0048 ]
`A physical channel consists of a plurality of sub
`frames in time domain and a plurality of subcarriers in
`frequency domain . One subframe consists of a plurality of
`symbols in the time domain . One subframe consists of a
`plurality of resource blocks ( RBs ) . One RB consists of a
`plurality of symbols and a plurality of subcarriers . In addi
`tion , each subframe may use specific subcarriers of specific
`symbols of a corresponding subframe for a PDCCH . For
`example , a first symbol of the subframe may be used for the
`PDCCH . The PDCCH carries dynamic allocated resources ,
`such as a physical resource block ( PRB ) and modulation and
`coding scheme ( MCS ) . A transmission time interval ( TTI )
`which is a unit time for data transmission may be equal to
`a length of one subframe . The length of one subframe may
`be 1 ms .
`[ 00491 . The transport channel is classified into a common
`transport channel and a dedicated transport channel accord
`ing to whether the channel is shared or not . A DL transport
`channel for transmitting data from the network to the UE
`includes a broadcast channel ( BCH ) for transmitting system
`information , a paging channel ( PCH ) for transmitting a
`paging message , a DL - SCH for transmitting user traffic or
`control signals , etc . The DL - SCH supports HARQ , dynamic
`link adaptation by varying the modulation , coding and
`transmit power , and both dynamic and semi - static resource
`allocation . The DL - SCH also may enable broadcast in the
`entire cell and the use of beamforming . The system infor
`ation carries one or more system information blocks . All
`system information blocks may be transmitted with the same
`
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`periodicity . Traffic or control signals of a multimedia broad
`cast / multicast service ( MBMS ) may be transmitted through
`the DL - SCH or a multicast channel ( MCH ) .
`[ 0050 ]
`UL transport channel for transmitting data from
`the UE to the network includes a random access channel
`( RACH ) for transmitting an initial control message , a UL
`SCH for transmitting user traffic or control signals , etc . The
`UL - SCH supports HARQ and dynamic link adaptation by
`varying the transmit power and potentially modulation and
`coding . The UL - SCH also may enable the use of beamform
`ing . The RACH is normally used for initial access to a cell .
`10051 ]
`A MAC layer belongs to the L2 . The MAC layer
`provides services to a radio link control ( RLC ) layer , which
`is a higher layer of the MAC layer , via a logical channel . The
`MAC layer provides a function of mapping multiple logical
`channels to multiple transport channels . The MAC layer also
`provides a function of logical channel multiplexing by
`mapping multiple logical channels to a single transport
`channel . A MAC sublayer provides data transfer services on
`logical channels .
`[ 0052 ] The logical channels are classified into control
`channels for transferring control plane information and
`traffic channels for transferring user plane information ,
`according to a type of transmitted information . That is , a set
`of logical channel types is defined for different data transfer
`services offered by the MAC layer . The logical channels are
`located above the transport channel , and are mapped to the
`transport channels .
`[ 0053 ] The control channels are used for transfer of con
`trol plane information only . The control channels provided
`by the MAC layer include a broadcast control channel
`( BCCH ) , a paging control channel ( PCCH ) , a common
`control channel ( CCCH ) , a multicast control channel
`( MCCH ) and a dedicated control channel ( DCCH ) . The
`BCCH is a downlink channel for broadcasting system con
`trol information . The PCCH is a downlink channel that
`transfers paging information and is used when the network
`does not know the location cell of a UE . The CCCH is used
`by UEs having no RRC connection with the network . The
`MCCH is a point - to - multipoint downlink channel used for
`transmitting MBMS control information from the network
`to a UE . The DCCH is a point - to - point bi - directional chan
`nel used by UEs having an RRC connection that transmits
`dedicated control information between a UE and the net -
`work .
`Traffic channels are used for the transfer of user
`[ 0054 ]
`plane information only . The traffic channels provided by the
`MAC layer include a dedicated traffic channel ( DTCH ) and
`a multicast traffic channel ( MTCH ) . The DTCH is a point
`to - point channel , dedicated to one UE for the transfer of user
`information and can exist in both uplink and downlink . The
`MTCH is a point - to - multipoint downlink channel for trans
`mitting traffic data from the network to the UE .
`10055 ] Uplink connections between logical channels and
`transport channels include the DCCH that can be mapped to
`the UL - SCH , the DTCH that can be mapped to the UL - SCH
`and the CCCH that can be mapped to the UL - SCH . Down
`link connections between logical channels and transport
`channels include the BCCH that can be mapped to the BCH
`or DL - SCH , the PCCH that can be mapped to the PCH , the
`DCCH that can be mapped to the DL - SCH , and the DTCH
`that can be mapped to the DL - SCH , the MCCH that can be
`mapp