US 20190260530A1
`( 19 ) United States
`( 12 ) Patent Application Publication ( 10 ) Pub . No . : US 2019 / 0260530 A1
`( 43 ) Pub . Date :
`Aug . 22 , 2019
`YI et al .
`
`( 54 ) METHOD AND APPARATUS FOR
`CONFIGURING SUBBAND AGGREGATION
`IN NR CARRIER IN WIRELESS
`COMMUNICATION SYSTEM
`( 71 ) Applicant : LG ELECTRONICS INC . , Seoul
`( KR )
`( 72 ) Inventors : Yunjung YI , Seoul ( KR ) ; Kijun KIM ,
`Seoul ( KR ) ; Byounghoon KIM , Seoul
`( KR )
`( 73 ) Assignee : LG Electronics Inc . , Seoul ( KR )
`( 21 ) Appl . No . :
`16 / 064 , 936
`( 22 ) PCT Filed :
`Nov . 1 , 2017
`( 86 ) PCT No . :
`PCT / KR2017 / 012255
`$ 371 ( c ) ( 1 ) ,
`( 2 ) Date :
`Jun . 21 , 2018
`Related U . S . Application Data
`( 60 ) Provisional application No . 62 / 492 , 935 , filed on May
`1 , 2017 , provisional application No . 62 / 457 , 802 , filed
`
`on Feb . 10 , 2017 , provisional application No . 62 / 452 ,
`393 , filed on Jan . 31 , 2017 , provisional application
`No . 62 / 417 , 449 , filed on Nov . 4 , 2016 , provisional
`application No . 62 / 416 , 108 , filed on Nov . 1 , 2016 .
`Publication Classification
`
`( 51 )
`
`Int . CI .
`H04L 5 / 00
`( 2006 . 01 )
`( 2006 . 01 )
`H04W 72 / 12
`( 52 ) U . S . CI .
`CPC . . . . . . . . . . . . H04L 5 / 0037 ( 2013 . 01 ) ; H04L 57001
`( 2013 . 01 ) ; H04L 5 / 0048 ( 2013 . 01 ) ; H04W
`72 / 1289 ( 2013 . 01 ) ; H04L 5 / 0057 ( 2013 . 01 ) ;
`H04L 5 / 0098 ( 2013 . 01 )
`ABSTRACT
`( 57 )
`A method and apparatus for configuring a data subband in a
`wireless communication system is provided . A user equip
`ment ( UE ) receives an indication of a data subband from a
`network , configures at least one data subband according to
`the indication , and performs communication with the net
`work via the at least one data subband . One data subband
`consists of contiguous or non - contiguous physical resource
`blocks ( PRBs ) .
`
`( START
`Receive an indication of a data subband
`from a network
`
`- $ 100
`
`Configure at least one data
`subband according to the indication
`
`-
`
`$ 110
`
`Perform communication with the network
`via the at least one data subband
`
`_ 5120
`
`END
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 1 of 22
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`[ Fig . 1 ]
`
`15a
`
`15b
`
`[ Fig . 2 ]
`
`SLOT
`# 1
`# 0
`SUBFRAME
`
`RADIO FRAME
`
`# 2
`
`# 18
`
`# 19
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 2 of 22
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`[ Fig . 3 ]
`
`1 DOWNLINK SLOT
`
`7 OFDM SYMBOL
`k = NRB X 12 - 1
`
`RB
`7x12 RE
`
`RE ( k , l )
`
`Neg * 12 SUBCARRIER 12 SUBCARRIER
`
`l = 0
`
`k = 0
`f = 6
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 3 of 22
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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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`:
`
`. . . .
`: : . .
`.
`
`[ Fig . 4 ]
`
`DL only or UL only
`
`L
`
`3
`
`: 1 :
`
`: 1
`
`2 :
`
`Frequency
`
`RB index
`
`: . .
`
`.
`
`: : :
`.
`: : ' . ' . '
`
`11 12 13
`
`10
`
`9
`
`8
`
`7 One TTI
`
`6
`
`5
`
`4
`
`3
`
`
`
`: UL Control Channel
`
`
`
`2 : 0l Control Channel
`
`2
`
`
`
`1 Symbol index
`
`0
`
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`Patent Application Publication
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`Aug . 22 , 2019 Sheet 4 of 22
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`[ Fig . 5 ]
`
`UE supported
`
`BW
`
`UE supported
`
`BW
`
`BW
`
`NR Carrier
`System
`supported BW
`
`UE
`
`| NR Carrier
`System BW
`supported BW
`
`UE
`
`| NR Carrier
`System BW
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 5 of 22
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`[ Fig . 6 ]
`
`Carrier 1
`
`Carrier 1
`
`carrier bonding
`
`System BW
`
`BW
`
`BW
`
`Carrier 1
`
`| System BW
`
`Carrier 2
`
`BW
`
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`Patent Application Publication
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`Aug . 22 , 2019 Sheet 6 of 22
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`[ Fig . 7 ]
`
`
`
`Not available
`
`M - SB
`
`M - SB
`
`
`
`Not available
`
`Anchor M - SB
`
`
`
`sync signals —
`
`maxRB + N
`
`maxRB + 1 maxRB maxRB - 1
`
`– maxRB - M
`
`maxRB - N
`
`
`
`sync signals
`
`( 6 )
`
`System BW
`
`- maxRB + N
`
`- maxRB + 1
`- maxRB - 1
`- maxRB
`
`- maxRB - M
`
`
`
`sync signals
`
`System BW
`
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`Aug . 22 , 2019 Sheet 7 of 22
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`[ Fig . 8 ]
`
`UE1 RF
`
`System
`bandwidth
`
`UE2 RF
`
`UE1 RF
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 8 of 22
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`[ Fig . 9 ]
`
`SB1
`
`SB2
`
`Anchor SB
`sync
`
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`Patent Application Publication
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`Aug . 22 , 2019 Sheet 9 of 22
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`[ Fig . 101
`
`?
`
`?
`
`ME
`
`AA
`
`?
`
`5
`
`net
`
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`
`MG
`
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`
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`
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`
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`
`1
`
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`
`( 3 )
`
`.
`
`?
`
`??
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 10 of 22 US 2019 / 0260530 A1
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`D - SB1
`
`D - SB2
`
`UE RF BW
`
`[ Fig . 11 ]
`
`System BW
`
`?
`
`AID - SB2
`
`?
`
`?
`
`?
`
`?
`
`carrier 1
`
`: . . . . . . . .
`
`UE RE BW
`
`D - SB3
`
`. . . .
`
`. .
`
`. . . . . .
`
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`Patent Application Publication
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`Aug . 22 , 2019 Sheet 11 of 22
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`[ Fig . 12 ]
`
`A data subband
`
`N —
`
`. . : :
`
`: . . . . . . .
`
`- maxRB + N
`
`maxRB + 1
`- maxRB
`maxRB - 1
`
`maxRB - M
`
`System BW
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 12 of 22 US 2019 / 0260530 A1
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`[ Fig . 13 ]
`
`. . .
`
`. .
`
`. . . .
`
`. .
`
`:
`
`. :
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`: in '
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`
`data
`
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`
`
`
`control subband
`
`
`
`control subband
`
`
`
`control subband
`
`System BW
`
`data
`
`System BW
`
`data
`
`BW - B
`
`System BW
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 13 of 22 US 2019 / 0260530 A1
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`BW - A .
`
`: : . : . :
`
`.
`
`:
`
`. . :
`
`" .
`
`. .
`
`:
`
`BW - B
`
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`supported
`BW
`
`VE
`supported
`BW
`
`BW - A
`
`System
`BW
`
`UE
`supported
`BW
`
`UF
`supported
`BW
`
`[ Fig . 14 ]
`
`System
`BW
`
`[ Fig . 15 )
`
`System BW
`
`DIAN
`DVV
`
`BW - A
`
`T
`
`M
`
`2 * M
`
`4 * M
`
`-
`
`center
`
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`Patent Application Publication
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`Aug . 22 , 2019 Sheet 14 of 22
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`[ Fig . 16 ]
`
`UE | supported BW
`
`UE
`
`BW
`
`U - carrier 1 | supported
`
`N - carrier | U - carrier
`
`N - carrier
`
`N - carrier
`
`N - carrier
`
`System BW
`supported BW
`
`VE
`
`UE supported BW
`
`U - carrier
`
`: .
`
`: . : . :
`
`:
`
`:
`
`:
`
`: :
`
`:
`
`N - carrier
`
`System
`
`BW
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 15 of 22 US 2019 / 0260530 A1
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`[ Fig . 17 ]
`
`— UE1
`
`- UE2
`
`
`
`Potential Interference
`
`-
`
`
`
`system bandwidth
`
`UE allocated BW
`
`UE allocated BW
`
`+
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 16 of 22 US 2019 / 0260530 A1
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`[ Fig . 18 ]
`
`UE1
`
`
`
`Potential Interference
`
`_ UE RF BW _ ,
`
`-
`
`
`
`system bandwidth
`
`
`
`UE allocated BW
`
`_ UE RF BW _ ,
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 17 of 22 US 2019 / 0260530 A1
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`[ Fig . 19 ]
`
`system BW
`
`N - carrier
`
`1st block
`
`2nd block
`
`1st block
`
`2nd block )
`
`3rd block
`
`4th block
`
`1st block
`
`2nd block
`
`3rd block
`
`4th block
`
`5th block
`
`6th block
`
`7th block
`
`8th block
`
`M MHz
`
`M / 2 MHz
`
`M / 4 MHz
`
`M / 8 MHz
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 18 of 22 US 2019 / 0260530 A1
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`[ Fig . 20 ]
`
`RRMSCSI - RS
`
`BW3
`
`Periodicity for RRM / CSI for UE - BW1
`
`BW3
`
`BW3
`
`
`
`
`
`Periodicity for RRM / CSI for UE - BW2
`
`, ' .
`
`.
`
`JU - carrier
`
`.
`
`.
`
`N
`
`UE - BW3 ( primary )
`
`??????????????????????????????????????????
`???????
`?
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`?
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`JU - carrier
`
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`
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`
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`
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`
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`
`UE - BW2
`
`?????
`
`.
`
`JU - carrier
`
`UE - BW1
`
`N - carrier
`
`System BW
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 19 of 22 US 2019 / 0260530 A1
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`[ Fig . 21 ]
`
`measurement BW
`
`. . . .
`wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
`
`U - carrier
`. . .
`. .
`
`.
`
`. . will
`
`UE - BW3 ( primary )
`
`-
`
`.
`
`. . . .
`
`. . . .
`
`.
`
`U - carrier
`
`UE - BW2
`
`!
`
`!
`
`
`
`
`
`Periodicity for RRM
`
`.
`
`. .
`
`.
`
`: :
`
`.
`
`1 . U - carrier :
`. . . . . . . ii
`
`.
`
`UE - BW1
`
`N - carrier
`
`System BW
`
`BW1
`
`BW3
`
`measurement deb
`
`BW3
`
`measurement
`
`BW3
`
`BW1
`
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`Aug . 22 , 2019 Sheet 20 of 22
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`[ Fig . 22 ]
`
`RRM / CSI - RS
`: RRM RS BW
`
`"
`
`.
`
`.
`
`.
`
`WWU - carrier
`
`UE - BW3 ( primary )
`
`-
`
`.
`
`.
`
`.
`
`.
`
`.
`
`UE - BW2
`
`- carrier
`
`UE - BW1
`
`N - carrier
`
`System BW
`
`BW3
`
`BW2
`
`
`
`RRM Periodicity
`
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`Aug . 22 , 2019 Sheet 21 of 22
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`BW2 - T
`
`
`
`RRM Periodicity
`
`BW adaptation
`
`BW1
`
`( b )
`
`1BW2
`
`T
`
`|
`
`:
`
`[ Fig . 23 ]
`
`- BW1
`
`
`
`RRM Periodicity
`
`BW2
`
`BW1 -
`
`Bandwidth BW1 BW2
`
`KUE RF BW
`
`? Part . .
`
`RRM RS BW
`
`NR CC1
`
`System BW
`
`: ?
`
`Part 1 : Part 1
`
`. ' :
`
`BW part 1 BW part 2
`
`UE RF BW UE RF BW
`
`
`| Bandwidth Bandwidth
`BW1
`
`' . '
`
`NR CC1
`
`System BW
`
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`Patent Application Publication Aug . 22 , 2019 Sheet 22 of 22 US 2019 / 0260530 A1
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`[ Fig . 24 ]
`
`START
`
`Receive an indication of a data subband
`from a network
`
`Configure at least one data
`subband according to the indication
`
`Perform communication with the network
`via the at least one data subband
`
`- S100
`
`- S110
`
`- S120
`
`( END
`
`800
`830
`TRANSCEIVER
`
`[ Fig . 25 ]
`
`810
`PROCESSOR
`820
`
`MEMORY
`
`900
`
`910
`
`930
`
`TRANSCEIVER
`
`PROCESSOR
`
`MEMORY
`
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`US 2019 / 0260530 A1
`
`Aug . 22 , 2019
`
`METHOD AND APPARATUS FOR
`CONFIGURING SUBBAND AGGREGATION
`IN NR CARRIER IN WIRELESS
`COMMUNICATION SYSTEM
`TECHNICAL FIELD
`[ 0001 ] The present invention relates to wireless commu
`nications , and more particularly , to a method and apparatus
`for configuring subband aggregation in a new radio access
`technology ( NR ) carrier in a wireless communication sys
`tem .
`
`BACKGROUND ART
`[ 0002 ] 3rd generation partnership project ( 3GPP ) long
`term
`evolution ( LTE ) is a technology for enabling high
`speed packet communications . Many schemes have been
`proposed for the LTE objective including those that aim to
`reduce user and provider costs , improve service quality , and
`expand and improve coverage and system capacity . The
`3GPP LTE requires reduced cost per bit , increased service
`availability , flexible use of a frequency band , a simple
`structure , an open interface , and adequate power consump
`tion of a terminal as an upper - level requirement .
`[ 0003 ] As more and more communication devices require
`more communication capacity , there is a need for improved
`mobile broadband communication over existing radio access
`technology . Also , massive machine type communications
`( MTC ) , which provides various services by connecting
`many devices and objects , is one of the major issues to be
`considered in the next generation communication . In addi
`tion , communication system design considering reliability !
`latency sensitive service / UE is being discussed . The intro
`duction of next generation radio access technology
`considering enhanced mobile broadband communication
`( MBB ) , massive MTC ( mMTC ) , ultra - reliable and low
`latency communication ( URLLC ) is discussed . This new
`technology may be called new radio access technology ( new
`RAT or NR ) for convenience .
`[ 0004 ]
`In NR , analog beamforming may be introduced . In
`case of millimeter wave ( mmW ) , the wavelength is short
`ened so that a plurality of antennas can be installed in the
`same area . For example , in the 30 GHz band , a total of 100
`antenna elements can be installed in a 2 - dimension array of
`0 . 5 lambda ( wavelength ) intervals on a panel of 5 by 5 cm
`with a wavelength of 1 cm . Therefore , in mm W , multiple
`antenna elements can be used to increase the beamforming
`gain to increase the coverage or increase the throughput .
`10005 ] .
`In this case , if a transceiver unit ( TXRU ) is pro
`vided so that transmission power and phase can be adjusted
`for each antenna element , independent beamforming is
`possible for each frequency resource . However , installing a
`TXRU on all 100 antenna elements has a problem in terms
`of cost effectiveness . Therefore , a method of mapping a
`plurality of antenna elements to one TXRU and adjusting the
`direction of a beam using an analog phase shifter is consid
`ered . This analog beamforming method has a disadvantage
`that it cannot perform frequency selective beaming because
`it can make only one beam direction in all bands .
`[ 0006 ]
`A hybrid beamforming with B TXRUS , which is an
`intermediate form of digital beamforming and analog beam
`forming , and fewer than Q antenna elements , can be con
`sidered . In this case , although there is a difference depending
`on the connection method of the B TXRU and Q antenna
`
`elements , the direction of the beam that can be simultane
`ously transmitted is limited to B or less .
`[ 0007 ] For operating NR efficiently , various schemes have
`been discussed .
`DISCLOSURE OF INVENTION
`Technical Problem
`[ 0008 ] The present invention provides a method and appa
`ratus for configuring subband aggregation in
`a new radio
`access technology ( NR ) carrier in a wireless communication
`system . The present invention proposes handling wideband
`carrier where different user equipments ( UEs ) may support
`different UE system bandwidth and also the configured
`bandwidth is changed for UE power saving and efficient
`resource management .
`Solution to Problem
`In an aspect , a method for configuring a data
`[ 0009 ]
`subband by a user equipment ( UE ) in a wireless communi
`cation system is provided . The method includes receiving an
`indication of a data subband from a network , configuring at
`least one data subband according to the indication , and
`performing communication with the network via the at least
`one data subband . One data subband consists of contiguous
`or non - contiguous physical resource blocks ( PRBs ) .
`a
`[ 0010 ]
`In another aspect , a user equipment ( UE ) in
`wireless communication system is provided . The UE
`includes a memory , a transceiver , and a processor , operably
`coupled to the memory and the transceiver , that controls the
`transceiver to receive an indication of a data subband from
`a network , configures at least one data subband according to
`the indication , and controls the transceiver to perform com
`munication with the network via the at least one data
`subband . One data subband consists of contiguous or non
`contiguous physical resource blocks ( PRBs ) .
`Advantageous Effects of Invention
`Efficient communication between UE and network
`[ 0011 ]
`and resource management can be enabled by using subbands
`in a NR carrier .
`BRIEF DESCRIPTION OF DRAWINGS
`[ 0012 ] FIG . 1 shows a 3GPP LTE system .
`[ 0013 ] FIG . 2 shows structure of a radio frame of 3GPP
`LTE .
`FIG . 3 shows a resource grid for one downlink slot .
`[ 0014 ]
`FIG . 4 shows an example of subframe type for NR .
`[ 0015 )
`FIG . 5 shows an example of different system
`[ 0016 ]
`bandwidth between network and UE in a NR carrier .
`[ 0017 ] FIG . 6 shows an example of carrier bonding .
`[ 0018 ]
`FIG . 7 shows an example of RB indexing accord
`ing to an embodiment of the present invention .
`[ 0019 ] FIG . 8 shows an example of configuration of
`different search space per UE according to an embodiment
`of the present invention .
`10020 ]
`FIG . 9 shows an example of handling anchor
`subband and other subband for UE - specific bandwidth sepa
`rately according to an embodiment of the present invention .
`[ 0021 ] FIG . 10 shows examples of different UE - specific
`bandwidth options according to an embodiment of the
`present invention .
`
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`
`Aug . 22 , 2019
`
`[ 0022 ] FIG . 11 shows an example of UE - specific sup
`ported bandwidth according to an embodiment of the present
`invention .
`[ 0023 ] FIG . 12 shows an example of individual RB index
`ing according to an embodiment of the present invention .
`[ 0024 ]
`FIG . 13 shows examples of dynamic bandwidth
`adaptation via data subband aggregation according to an
`embodiment of the present invention .
`[ 0025 )
`FIG . 14 shows examples of bandwidth adaptation
`via data subband aggregation with multiple RF according to
`an embodiment of the present invention .
`10026 ] FIG . 15 shows an example of resource allocation in
`a nested manner according to an embodiment of the present
`invention .
`[ 0027
`FIG . 16 shows an example of different handling
`options for wideband spectrum with narrowband UE RFs
`according to an embodiment of the present invention .
`10028 ]
`FIG . 17 shows an example of interference in case
`of small bandwidth transmission .
`10029 ]
`FIG . 18 shows an example of interference in case
`of multiple RFs .
`10030 )
`FIG . 19 shows an example of overlaid structure
`according to an embodiment of the present invention .
`( 0031 ) FIG . 20 shows an example of option 1 for RRM
`handling in wideband according to an embodiment of the
`present invention .
`[ 0032 ]
`FIG . 21 shows an example of option 2 for RRM
`handling in wideband according to an embodiment of the
`present invention .
`[ 0033 ]
`FIG . 22 shows an example of option 3 for RRM
`handling in wideband according to an embodiment of the
`present invention .
`[ 0034 ]
`FIG . 23 shows an example of different RRM band
`width options according to an embodiment of the present
`invention
`[ 0035 ] FIG . 24 shows a method for configuring a data
`subband by a UE according to an embodiment of the present
`invention .
`[ 0036 ] FIG . 25 shows a wireless communication system to
`implement an embodiment of the present invention .
`MODE FOR THE INVENTION
`[ 0037 ] FIG . 1 shows a 3GPP LTE system . The 3rd gen
`eration partnership project ( 3GPP ) long - term evolution
`( LTE ) system 10 includes at least one eNodeB ( NB ) 11 .
`Respective eNBs 11 provide a communication service to
`particular geographical areas 15a , 15b , and 15c ( which are
`generally called cells ) . Each cell may be divided into a
`plurality of areas ( which are called sectors ) . A user equip
`ment ( UE ) 12 may be fixed or mobile and may be referred
`to by other names such as mobile station ( MS ) , mobile
`terminal ( MT ) , user terminal ( UT ) , subscriber station ( SS ) ,
`wireless device , personal digital assistant ( PDA ) , wireless
`modem , handheld device . The eNB 11 generally refers to a
`fixed station that communicates with the UE 12 and may be
`called by other names such as base station ( BS ) , base
`transceiver system ( BTS ) , access point ( AP ) , etc .
`[ 0038 ]
`In general , a UE belongs to one cell , and the cell to
`which a UE belongs is called a serving cell . An eNB
`providing a communication service to the serving cell is
`called a serving eNB . The wireless communication system is
`a cellular system , so a different cell adjacent to the serving
`cell exists . The different cell adjacent to the serving cell is
`called a neighbor cell . An eNB providing a communication
`
`service to the neighbor cell is called a neighbor eNB . The
`serving cell and the neighbor cell are relatively determined
`based on a UE .
`[ 0039 ] This technique can be used for DL or UL . In
`general , DL refers to communication from the eNB 11 to the
`UE 12 , and UL refers to communication from the UE 12 to
`the eNB 11 . In DL , a transmitter may be part of the eNB 11
`and a receiver may be part of the UE 12 . In UL , a transmitter
`may be part of the UE 12 and a receiver may be part of the
`eNB 11 .
`[ 0040 ] The wireless communication system may be any
`one of a multiple - input multiple - output ( MIMO ) system , a
`multiple - input single - output ( MISO ) system , a single - input
`single - output ( SISO ) system , and a single - input multiple
`output ( SIMO ) system . The MIMO system uses a plurality
`of transmission antennas and a plurality of reception anten
`nas . The MISO system uses a plurality of transmission
`antennas and a single reception antenna . The SISO system
`uses a single transmission antenna and a single reception
`antenna . The SIMO system uses a single transmission
`antenna and a plurality of reception antennas . Hereinafter , a
`transmission antenna refers to a physical or logical antenna
`used for transmitting a signal or a stream , and a reception
`antenna refers to a physical or logical antenna used for
`receiving a signal or a stream .
`( 0041 ]
`FIG . 2 shows structure of a radio frame of 3GPP
`LTE . Referring to FIG . 2 , a radio frame includes 10 sub
`frames . A subframe includes two slots in time domain . A
`time for transmitting one transport block by higher layer to
`physical layer ( generally over one subframe ) is defined as a
`transmission time interval ( TTI ) . For example , one subframe
`may have a length of 1 ms , and one slot may have a length
`of 0 . 5 ms . One slot includes a plurality of orthogonal
`frequency division multiplexing ( OFDM ) symbols in time
`domain . Since the 3GPP LTE uses the OFDMA in the DL ,
`the OFDM symbol is for representing one symbol period .
`The OFDM symbols may be called by other names depend
`ing on a multiple - access scheme . For example , when SC
`FDMA is in use as a UL multi - access scheme , the OFDM
`symbols may be called SC - FDMA symbols . A resource
`block ( RB ) is a resource allocation unit , and includes a
`plurality of contiguous subcarriers in one slot . The structure
`of the radio frame is shown for exemplary purposes only .
`Thus , the number of subframes included in the radio frame
`or the number of slots included in the subframe or the
`number of OFDM symbols included in the slot may be
`modified in various manners .
`[ 0042 ]
`The wireless communication system may be
`divided into a frequency division duplex ( FDD ) scheme and
`a time division duplex ( TDD ) scheme . According to the
`FDD scheme , UL transmission and DL transmission are
`made at different frequency bands . According to the TDD
`scheme , UL transmission and DL transmission are made
`during different periods of time at the same frequency band .
`A channel response of the TDD scheme is substantially
`reciprocal . This means that a DL channel response and a UL
`channel response are almost the same in a given frequency
`band . Thus , the TDD - based wireless communication system
`is advantageous in that the DL channel response can be
`obtained from the UL channel response . In the TDD scheme ,
`the entire frequency band is time - divided for UL and DL
`transmissions , so a DL transmission by the eNB and a UL
`transmission by the UE cannot be simultaneously per
`formed . In a TDD system in which a UL transmission and
`
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`a DL transmission are discriminated in units of subframes ,
`the UL transmission and the DL transmission are performed
`in different subframes . In a TDD system , to allow fast
`switching between DL and UL , UL and DL transmission
`may be performed within a same subframe / slot in time
`division multiplexing ( TDM ) / frequency division multiplex
`ing ( FDM ) manner .
`[ 0043 ] FIG . 3 shows a resource grid for one downlink slot .
`Referring to FIG . 3 , a DL slot includes a plurality of OFDM
`symbols in time domain . It is described herein that one DL
`slot includes 7 OFDM symbols , and one RB includes 12
`subcarriers in frequency domain as an example . However ,
`the present invention is not limited thereto . Each element on
`the resource grid is referred to as a resource element ( RE ) .
`One RB includes 12x7 or 12x14 resource elements . The
`number Nb of RBs included in the DL slot depends on a DL
`transmit bandwidth . The structure of a UL slot may be same
`as that of the DL slot . The number of OFDM symbols and
`the number of subcarriers may vary depending on the length
`of a CP , frequency spacing , etc . For example , in case of a
`normal cyclic prefix ( CP ) , the number of OFDM symbols is
`7 or 14 , and in case of an extended CP , the number of OFDM
`symbols is 6 or 12 . One of 128 , 256 , 512 , 1024 , 1536 , 2048 ,
`4096 and 8192 may be selectively used as the number of
`subcarriers in one OFDM symbol .
`[ 0044 ]
`5th generation mobile networks or 5th generation
`wireless systems , abbreviated 5G , are the proposed next
`telecommunications standards beyond the current 4G LTE /
`international mobile telecommunications ( IMT ) - dvanced
`standards . 5G includes both new radio access technology
`( new RAT or NR ) and LTE evolution . Hereinafter , among
`5G , NR will be focused . 5G planning aims at higher capacity
`than current 4G LTE , allowing a higher density of mobile
`broadband users , and supporting device - to - device , ultra
`reliable , and massive machine communications . 5G research
`and development also aims at lower latency than 4G equip
`ment and lower battery consumption , for better implemen
`tation of the Internet of things .
`100451 NR may use the OFDM transmission scheme or a
`similar transmission scheme . NR may follow the existing
`LTE / LTE - A numerology , or may follow the different numer
`ology from the existing LTE / LTE - A numerology . NR may
`have a larger system bandwidth ( e . g . 100 MHz ) . Or , one cell
`may support multiple numerologies in NR . That is , UEs
`operating in different numerologies may coexist within one
`cell in NR .
`[ 0046 ]
`It is expected that different frame structure may be
`necessary for NR . Particularly , different frame structure in
`which UL and DL may be present in every subframe or may
`change very frequently in the same carrier may be necessary
`for NR . Different application may require different mini
`mum size of DL or UL portions to support different latency
`and coverage requirements . For example , massive machine
`type communication ( mMTC ) for high coverage case may
`require relatively long DL and UL portion so that one
`transmission can be successfully transmitted . Furthermore ,
`due to different requirement on synchronization and tracking
`accuracy requirements , different subcarrier spacing and / or
`different CP length may be considered . In this sense , it is
`necessary to consider mechanisms to allow different frame
`structures coexisting in the same carrier and be operated by
`the same cell / eNB .
`[ 0047 ]
`In NR , utilizing a subframe in which downlink and
`uplink are contained may be considered . This scheme may
`
`be applied for paired spectrum and unpaired spectrum . The
`paired spectrum means that one carrier consists of two
`carriers . For example , in the paired spectrum , the one carrier
`may include a DL carrier and an UL carrier , which are paired
`with each other . In the paired spectrum , communication ,
`such as DL , UL , device - to - device communication , and / or
`relay communication , may be performed by utilizing the
`paired spectrum . The unpaired spectrum means that that one
`carrier consists of only one carrier , like the current 4G LTE .
`In the unpaired spectrum , communication , such as DL , UL ,
`device - to - device communication , and / or relay communica
`tion , may be performed in the unpaired spectrum .
`[ 0048 ] Further , in NR , the following subframe types may
`be considered to support the paired spectrum and the
`unpaired spectrum mentioned above .
`[ 0049 ]
`( 1 ) Subframes including DL control and DL data
`[ 0050 ]
`( 2 ) Subframes including DL control , DL data , and
`UL control
`[ 0051 ]
`( 3 ) Subframes including DL control and UL data
`[ 0052 ]
`( 4 ) Subframes including DL control , UL data , and
`UL control
`[ 00531 ( 5 ) Subframes including access signals or random
`access signals or other purposes .
`[ 0054 ]
`( 6 ) Subframes including both DL / UL and all UL
`signals .
`[ 0055 ] However , the subframe types listed above are only
`exemplary , and other subframe types may also be consid
`ered .
`100561 . FIG . 4 shows an example of subframe type for NR .
`The subframe shown in FIG . 4 may be used in TDD system
`of NR , in order to minimize latency of data transmission .
`Referring to FIG . 4 , the subframe contains 14 symbols in
`one TTI , like the current subframe . However , the subframe
`includes DL control channel in the first symbol , and UL
`control channel in the last symbol . A region for DL control
`channel indicates a transmission area of a physical downlink
`control channel ( PDCCH ) for Downlink control information
`( DCI ) transmission , and a region for UL control channel
`indicates a transmission area of a physical uplink control
`channel ( PUCCH ) for uplink control information ( UCI )
`transmission . Here , the control information transmitted by
`the eNB to the UE through the DCI may include information
`on the cell configuration that the UE should know , DL
`specific information such as DL scheduling , and UL specific
`information such as UL grant . Also , the control information
`transmitted by the UE to the eNB through the UCI may
`include a hybrid automatic repeat request ( HARQ ) acknowl
`edgement / non - acknowledgement ( ACK / NACK ) report for
`the DL data , a channel state information ( CSI ) report on the
`DL channel status , and a scheduling request ( SR ) . The
`remaining symbols may be used for DL data transmission
`( e . g . physical downlink shared channel ( PDCCH ) ) or for UL
`data transmission ( e . g . physical uplink shared channel
`( PUCCH ) ) .
`[ 0057 ] According to this subframe structure , DL transmis
`sion and UL transmission may sequentially proceed in one
`subframe . Accordingly , DL data may be transmitted in the
`subframe , and UL acknowledgement / non - acknowledgement
`( ACK / NACK ) may also be received in the subframe . In this
`manner , the subframe shown in FIG . 4 may be referred to as
`self - contained subframe . As a result , it may take less time to
`retransmit data when a data transmission error occurs ,
`thereby minimizing the latency of final data transmission . In
`the self - contained subframe structure , a time gap may be
`
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`required for the transition process from the transmission
`mode to the reception mode or from the reception mode to
`the transmission mode . For this purpose , some OFDM
`symbols at the time of switching from DL to UL in the
`subframe structure may be set to the guard period ( GP ) .
`10058 ]
`In NR , wideband may be used if the network
`supports . Further in NR , both network and UE may have
`different bandwidths to be supported . In this case , it may
`need to be clarified how the network and UE operate
`transmission and reception .
`[ 0059 ]
`FIG . 5 shows an example of different system
`bandwidth between network and UE in a NR carrier . The
`carrier bandwidth that the network supports may be a system
`bandwidth . The UE supported bandwidth may be equal to
`the system bandwidth or different from the system band
`width ( may be narrower or wider than the system band
`width ) . FIG . 5 - ( a ) shows a case that the system bandwidth
`is same as the UE supported bandwidth . FIG . 5 - ( b ) shows a
`case that the system bandwidth is different from the UE
`supported bandwidth , i . e . the system bandwidth is wider
`than the UE supported bandwidth . FIG . 5 - ( c ) shows a case
`that the system band