US 20190068308A1
`( 19 ) United States
`( 12 ) Patent Application Publication ( 10 ) Pub . No . : US 2019 / 0068308 A1
`( 43 ) Pub . Date :
`Feb . 28 , 2019
`SHIN et al .
`
`( 54 ) DMRS PORT GROUPING METHOD AND
`APPARATUS FOR USE IN WIRELESS
`CELLULAR COMMUNICATION SYSTEM
`( 71 ) Applicant : Samsung Electronics Co . , Ltd . ,
`Gyeonggi - so ( KR )
`( 72 ) Inventors : Cheolkyu SHIN , Gyeonggi - do ( KR ) ;
`Youngwoo Kwak , Gyeonggi - do ( KR ) ;
`Hoondong Noh , Gyeonggi - do ( KR ) ;
`Taehan Bae , Seoul ( KR ) ; Jeongho Yeo ,
`Gyeonggi - do ( KR ) ; Jinyoung Oh ,
`Seoul ( KR )
`( 21 ) Appl . No . : 16 / 111 , 935
`( 22 ) Filed :
`Aug . 24 , 2018
`Foreign Application Priority Data
`( 30 )
`Aug . 24 , 2017
`( KR ) . . .
`. . . 10 - 2017 - 0107485
`Sep . 1 , 2017
`( KR ) . . . . . . . . . . . . . . . . . . . . . . . . 10 - 2017 - 0111949
`Sep . 29 , 2017
`. . 10 - 2017 - 0128078
`( KR ) . . .
`Nov . 10 , 2017
`( KR ) . . . . . . . . . . . . . . . . . . . . . 10 - 2017 - 0149873
`Publication Classification
`
`( 51 ) Int . Cl .
`H04 ) 13 / 12
`H04W 76 / 27
`H04L 1 / 18
`H04L 5 / 00
`H04W 72 / 04
`H04 ) 13 / 00
`
`( 2006 . 01 )
`( 2006 . 01 )
`( 2006 . 01 )
`( 2006 . 01 )
`( 2006 . 01 )
`( 2006 . 01 )
`
`( 52 ) U . S . CI .
`CPC . . . .
`PO
`
`H04J 13 / 12 ( 2013 . 01 ) ; H04W 76 / 27
`( 2018 . 02 ) ; H04L 1 / 1861 ( 2013 . 01 ) ; H04J
`2013 / 0096 ( 2013 . 01 ) ; H04W 72 / 042
`( 2013 . 01 ) ; H042 13 / 0003 ( 2013 . 01 ) ; H04L
`570048 ( 2013 . 01 )
`
`ABSTRACT
`( 57 )
`The present disclosure relates to a communication method
`and system for converging a 5th Generation ( 5G ) commu
`nication system for supporting higher data rates beyond a
`4th - Generation ( 4G ) system with a technology for Internet of
`Things ( IoT ) . The present disclosure may be applied to
`intelligent services based on the 5G communication tech
`nology and the IoT - related technology , such as smart home ,
`smart building , smart city , smart car , connected car , health
`care , digital education , smart retail , security and safety
`services .
`A method of a terminal in a wireless communication system
`is provided . The method includes identifying demodulation
`reference signal ( DMRS ) type information and DMRS sym
`bol length information , identifying port number information
`for receiving a DMRS and receiving the DMRS based on the
`DMRS type information , the DMRS symbol length infor
`mation and port number information , wherein the port
`number information indicates a port number for the terminal
`in DMRS information including parameters for code divi
`sion multiplexing ( CDM ) group information , offset infor
`mation , frequency - domain orthogonal cover code ( OCC )
`information , and time - domain OCC information corre
`sponding respectively to multiple port numbers , and wherein
`the DMRS information is defined per DMRS type .
`
`Radio frame ( 114 )
`
`KH
`
`Subframe ( 105 )
`
`DCI
`Slot ( 106 )
`
`- - - - - - - -
`
`
`
`No subcarriers ( 104 ) NRB Subcarriers ( 110 )
`
`Resource element
`( 112 )
`
`Resource block
`( 108 )
`
`N symbOFDM symbols
`( 1021
`
`Ex.1006
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`Feb . 28 , 2019 Sheet 1 of 21
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`FIG . 1
`
`Radio frame ( 114 )
`
`Subframe ( 105 )
`
`D
`
`Slot ( 106 )
`
`-
`
`-
`
`-
`
`-
`
`Resource element
`( 112 )
`
`Resource block
`( 108 )
`
`
`
`Note subcarriers ( 104 ) NRB subcarriers ( 110 )
`
`
`
`- -
`
`-
`
`-
`
`-
`
`-
`
`N symb OFDM symbols
`( 102 )
`
`Ex.1006
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`FIG . 2
`
`Radio frame ( 214 )
`
`-
`
`Subframe ( 205 )
`
`Slot ( 206 )
`
`-
`
`-
`
`-
`
`-
`
`-
`
`Resource element
`( 212 )
`
`Resource block
`( 208 )
`
`
`
`Note subcarriers ( 204 ) NRB Subcarriers ( 210 )
`
`
`
`-
`
`I
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`Neum SC - FDMA symbols
`( 202 )
`
`Ex.1006
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`CRS
`
`DMRS
`
`PDSCH
`
`
`
`Control Channels
`
`N
`
`Y
`
`XXX
`
`CSI - RS
`
`-
`
`-
`
`FIG . 3
`
`
`
`1 subframe = 14 OFDM symbols = 1 msec
`
`III
`
`
`
`Data Region
`
`
`
`Control Region
`
`1 RB = 12 subcarriers = 180kHz
`
`Ex.1006
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`: Green
`WZ : Red
`?????????????????????????????????????
`PARAMPARAR with
`
`LUULUU
`
`PUP2
`| P1P2 P3 / 04
`
`P1 / P2
`
`P1 / P2
`
`FIG . 4 .
`
`P1 / P3
`
`P1 / P3 P2 / P4
`
`Edlld | P1 / P3 P2 / 24
`
`OIP
`
`P1 / P2 / P3 / P4 P5 / P6 / 07 / 08 P1 / P2 / P3 / P4 P5 / P6 / 07 / P8 PU / P2 / P3 / P4 P5 / P6 / P7 / 08 P1 / P2 / P3 / 04 P5 / P6 / 07 / 08 PU / P2 / P3 / P4
`
`P1 / P2 / P3 / P4
`
`wytyytyyyy
`P1 / P2 / P5 / P6 P3 / P4 / P7 / 18 PIP2P5IP6 P3 / 24 / 27 / 28 P1 / P2 / P5 / P6 P3 / P4 / P7 / 18 P1 / P21P5 / P6 P3 / P4 / P7 / P8 P1 / P2 / P5 / P6 P3 / P4 / P7 / 18 P1 / P2 / 05 / P6 P3 / P4 / P71P8
`
`HE71 PH www .
`
`d60
`
`P1 / P2 / P5 / 27 P3 / P4 / P6 / P8 P1 / P2 / P5 / P7 P3 / P4 / P6 / P8 P1 / P2 / P5 / P7 P31P4 / P6 / P8 P1 / P2 / 05 / P7 P3 / P4 / P6 / P8 P1 / P2 / P5 / P7 P3 / P4 / P6 / P8 P1 / P2 / P5 / P7 P3 / PA / P6 / P8
`
`d50
`
`???? / ????? P2 / P4 / P7 / P8 ?? ??I??IP6 P2 / 04 / 07 / P8 P1 / P3 / P5 / P6 P2 / P4 / P7 / P8 P1 / P3 / P5 / P6 - P2PAPTP8 P1 / P3 / P5 / P6 P2 / 04 / 07 / 08 P1 / P3 / P5 / P6 P2 / P4 / P7 / 08
`d40
`
`P1 / P3 / P5 / P7 P2 / P4 / P6 / P8 P1 / P3 / P5 / 07 P2 / P4 / P6 / P8 P1 / P3 / P5 / P7 P2 / P4 / P6 / P8 P1 / P3 / P5 / 07 P2 / P4 / P6 / P8 P1 / P3 / P5 / P7 P2 / P4 / P6 / P8 P1 / P3 / 05 / 07 P2P4 / P6 / P8
`
`OEP
`
`Ex.1006
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`X 311
`IR
`
`PUP2 / P31P4 P1 / P2 / P3 / P4
`
`P5 / P6 / P7 / P8 P9 / P10 / P10P12 P9 / P10 / P11 / P12 P1 / P2 / P3 / P4 P1 / P2 / P3 / P4 - P5 / P6 / P7 / P8 P5 / P6 / P7 / 08 P9 / P10 / P11 / P12 P9 / P10 / P11 / P12
`
`D
`
`T
`
`: Green
`U2 : Red
`
`WA : Blue
`
`e70
`
`PMPA )
`
`| P2 / P5
`
`FIG . 5
`
`e20
`
`www .
`VP1 / P4 / P7 / P8 P1 / PA / P7 / P8 P2 / P5 / P9 / P10 P2 / P5 / P9 / P10 P3 / P6 / P11 / P12 P3 / PG / P11 / P12 P1 / P4 / 07 / P8 PPA P708 P2 / P5 / P9 / P10 P2 / P5 / P9 / P10 P3 / P6 / P11 / 012 P3 / P6 / P11 / P12
`
`
`mo
`
`XX
`
`P1 / P4 / 07 / P10 PUP4 / 07 / P10 P2 / P5 / P8 / P11 P2 / P5 / P8 / P11 P3 / P6 / P9 / P12 P3 / P6 / P9 / P12 PUP4 / P7 / P10 P1 / P4 / P7 / P10 P2 / P5 / P8 / P10 P2 / P5 / P8 / P11 P3 / P6 / P9 / P12 P3 / P6 / P9 / P12
`
`POPOTOPILA
`
`050
`
`PUP2IP71P10
`
`P1 / P2P71010
`
`P3 / P4 / P8 / P11 P5 / P6 / P9 / P12 P5 / P6 / P9 / P12 P1 / P2 / P2 / P10 P1 / P2 / P7 / P10 P3 / 24 / 28 / P11 P3 / P4 / P8 / P11 P5 / P6 / P9 / P12 P5 / Pb / P9 / P12
`www . wasababu
`
`IN
`
`PIP2
`
`P3 / P4
`
`P5 / P6
`P1 / P2 P3 / P4
`
`5
`
`e40
`
`P1P21P7 / P8
`P5 / P6 / P11 / P12 P1 / P2IP7 / P8 P1 P2P7P8 .
`P3P4 P9 / 10 P3 / P4 / P9 / P10 P5 / P6 / P11 / P12
`P1 P2 . 1P11P8
`
`P3 / P4 / P9 / P10 P5 / P6 / P11 / 12 P5 / P6 / P11 / P12
`
`e30
`
`Ex.1006
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`
`
`
`
`configured for two - symbol pattern
`
`
`signaling for Type 1
`
`gNB assume ' number of layers / port number
`
`
`
`
`
`
`
`pattern ? One symbol or two symbol DMRS
`
`f10
`
`
`
`DMRS Type 1 or 2 ?
`
`Ww
`
`. . .
`
`FIG . 6A
`start
`
`(
`
`
`
`
`
`gNB configure DMRS Type information via
`
`
`higher layer signaling
`
`C
`
`f20
`
`
`
`signaling for Type 1
`
`gNB assume ' number of layers / port number
`
`
`
`pattern ? One symbol or two symbol DMRS
`
`
`
`
`
`
`
`check detailed DMRS information
`
`
`
`
`
`
`
`configure parameter for one - symbol
`
`pattern
`
`140
`
`end
`
`
`
`
`
`UE perform channel estimation
`
`
`
`
`
`configure parameter for two - symbol
`
`pattern
`
`
`
`Configure parameter for one - symbol
`
`pattern
`
`
`
`
`
`
`
`UE check detailed DMRS information
`
`Ex.1006
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`FIG . 6B
`
`a
`( 1
`1
`1
`
`b
`1
`1
`1
`
`c
`1
`1
`- 1
`
`d
`1
`- 11
`- 1
`
`Layer
`
`Ex.1006
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`????????w
`?????????
`
`the ther
`
`timulture
`
`RB n
`
`RB 1 + 1
`
`alc b / d
`FIG . 7A
`
`alc
`
`RB n
`
`bld
`
`cla
`
`BB 1 + 1
`
`- 3 . 03dB
`
`? The peak power variation is 4 . 77dB
`
`
`
`920
`
`1 . 76MB OdB
`Power
`
`revers " :
`
`ProveProve a re - Prove a rev " rever - Prever - Prevers "
`
`???????
`
`Wall
`
`be
`
`RB n
`
`016
`
`Power
`
`940
`
`080
`
`WA : Red ? : Green
`
`Ex.1006
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`
`
`
`
`??? ??? ?????
`
`1 / 1
`
`0 / 0
`
`XXVIK .
`
`RB n
`
`RB 1 + 1
`
`???
`
`Power
`086
`
`PIN
`
`wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
`
`CWLWWLLLLLLLLLLLLLLLLLLLL
`
`RB 1 + 1
`
`WARUUUUUUUUUUU
`
`.
`
`OL6
`
`FIG . 7B
`
`Violet p / q1
`
`pla
`
`RB n
`
`OIU
`470
`
`wwwwwwwwwwwwwwwwwwwwwwwwwww
`
`/
`
`Valc b / d
`
`RB n
`
`wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
`
`WWWWWWWWWWWWWWWWWW
`
`8P971 Lapore
`
`950
`
`XX
`
`- 1 . 76dB
`
`
`
`
`
`? The peak power variation is 3 . 01dB
`
`096
`
`B : Green WA : Blue
`UZZ : Red
`
`Ex.1006
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`1 / 1 1 / 1 1 / 1 1 / 1
`1 / 1 1 / 1
`1 / 1
`
`1 / 1
`
`11
`
`1 / 1 1 / 1 1 / 1
`
`11 1 / 1 1 / 1 1 / 1 OdB
`
`RB n
`
`RB n + 1
`
`
`
`Sonylalayang yang
`
`FIG . 7C
`
`RB n
`
`RB 1 + 1
`
`Power
`9120
`
`9110
`
`g100
`
`- 0 . 79dB
`
`? The peak power variation is 1 . 46dB
`
`
`
`
`
`
`
`????????????
`0 . 67dB
`OdB
`Power
`
`RB n
`
`VA
`hid
`
`a / C
`
`990
`
`RB n
`
`Ex.1006
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`h32
`
`
`
`information QCled for Type 2
`
`
`
`UE check DMRS port grouping
`
`Type 2
`
`h30
`
`
`
`
`
`
`
`configure two or more DMRS port groups
`
`
`
`
`
`DMRS type information
`
`940
`
`Type 1
`
`
`
`
`information QCLed for Type 1
`
`
`
`UE check DMRS port grouping
`
`
`
`
`port locations and QCL information
`
`
`UE perform channel estimation based on RS transmit a DMRS
`
`end
`
`FIG . 8
`
`h00
`
`start
`
`grouping , etc . ) UE receives DMRS information | h10 ( DMRS information , # of layers , port , DMRS type
`
`
`
`
`port grouping , etc . )
`
`port type information , # of layers , port , OMRS
`
`
`
`
`
`GNB configure DMRS information ( DMRS
`
`
`
`
`
`
`
`< Number of DMRS port group
`
`. . .
`
`. . .
`
`.
`
`. .
`
`.
`
`ports are QCLed
`UE assume all
`
`
`configure one DMRS port group
`
`
`
`h20
`
`Ex.1006
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`checked by UE # of CDMed groups configured by GNB > number of CDMed groups
`
`
`
`
`
`
`100
`
`start
`
`
`type information , # of layers , port , # of CDMed groups , etc . )
`
`
`VE receive DMRS information ( DMRS
`
`
`
`
`
`
`
`
`
`
`
`transmission locations and based on DMRS port number of CDMed group configured by gNB
`
`groups checked UE compare number of CDMed
`
`140
`
`O
`
`FIG . 9A
`
`
`
`port locations and QCL information
`
`
`UE perform channel estimation based on RS transmitted at DMRS
`
`
`
`data at non - DMRS port locations
`UE receive
`
`end
`
`equal
`
`121
`
`DMRS IS transmitted at all RES of OFDM symbol ?
`
`130
`
`
`port locations UE assume RS being transmitted at DMRS
`
`
`
`
`YES
`
`
`
`
`
`UE perform channel estimation based on RS transmitted at DMRS port
`
`locations and QCL information
`
`Ex.1006
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`I 191
`
`
`UE assume no data
`
`being transmitted at non - DMRS port locations
`
`
`
`port locations and QCL information
`
`
`UE perform channel estimation based on RS transmitted at DMRS
`
`
`
`
`number of CDM groups configured by GNB
`
`180
`
`181
`
`182
`
`Type 2
`
`FIG . 9B
`
`DATA being UE assume RS and transmitted at non - DMRS port locations
`
`
`
`
`
`
`
`
`
`
`port locations and QCL information
`
`
`UE perform channel estimation based on RS transmitted at OMRS
`
`
`end
`
`
`
`
`
`UE receive data transmitted at data transmission locations
`
`
`
`
`
`
`
`DMRS type information
`
`Type 1
`
`161
`
`
`
`
`
`UE assume no data being transmitted at non - DMRS port locations
`
`
`
`
`UE perform channel estimation based on RS transmitted at OMRS
`
`
`locations and QCL information
`port
`
`Ex.1006
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`FIG . 10A
`
`2 / 3 / 6 / 7
`0 / 1 / 4 / 5
`2 / 3 / 6 / 7
`0 / 1 / 4 / 5
`2 / 3 / 6 / 7
`0 / 1 / 4 / 5
`2 / 3 / 6 / 7
`0 / 1 / 4 / 5
`2 / 3 / 6 / 7
`0 / 14 / 5
`2 / 3 / 6 / 7
`0 / 174 / 5
`
`4 / 5 / 10 / 11
`4 / 5 / 10 / 11
`2 / 3 / 8 / 9
`2 / 3 / 8 / 9
`0 / 1 / 6 / 7
`KX
`0 / 1 / 6 / 7
`4 / 5 / 10 / 11
`4 / 5 / 10 / 11
`2 / 3 / 8 / 9
`2 / 3 / 8 / 9
`0 / 1 / 6 / 7
`0 / 1 / 6 / 7
`
`W
`w
`
`140
`
`2 / 3
`
`2 / 3
`
`213
`
`2 / 3
`
`2 / 3
`
`4 / 5
`
`23
`2 / 3
`0 / 1
`
`415
`4 / 5
`23
`23
`0 / 1
`| 0 / 1
`
`U2 : Red
`· Green
`: Blue
`
`Ex.1006
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`FIG . 10B
`
`i50
`
`160
`
`KIRINKININ
`
`NINIRINININ
`
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`
`VI : Red
`E
`: Green
`: Blue
`
`??
`
`213
`
`213
`23
`
`8 / 9 / 10 / 11
`8 / 9 / 10 / 11
`4 / 5 / 6 / 7
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`XKX Be
`0 / 1 / 2 / 3
`180
`8 / 9 / 10 / 11
`8 / 9 / 10 / 11
`4 / 5 / 6 / 7
`4 / 5 / 6 / 7
`0 / 1 / 2 / 3
`0128
`
`Ex.1006
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`FIG . 10C
`
`1100
`
`2 / 3 / 5 / 7
`0 / 1 / 4 / 6
`2 / 3 / 5 / 7
`0 / 1 / 4 / 6
`2 / 3 / 5 / 7
`0 / 1 / 4 / 6
`2 / 3 / 5 / 7
`0 / 1 / 4 / 6
`2 / 3 / 5 / 7
`OFT 4 6
`2 / 3 / 5 / 7
`
`4 / 5 / 8 / 11
`4 / 5 / 8 / 11
`2 / 3 / 7 / 10
`2 / 3 / 7 / 10
`0 / 1 / 6 / 9
`
`4 / 5 / 8 / 11
`4 / 5 / 8 / 11
`2 / 3 / 7 / 10
`2 / 3 / 7 / 10
`0 / 1 / 6 / 9
`0 / 1 / 6 / 9
`
`KI
`
`j110
`
`2 / 3
`2 / 3
`
`2 / 3
`2 / 3
`
`QUI
`
`Ex.1006
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`Patent Application Publication
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`Feb . 28 , 2019 Sheet 17 of 21
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`US 2019 / 0068308 A1
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`FIG . 11
`
`TP - A
`
`TP - B
`
`OOOO Ooo
`
`UE1
`
`000
`
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`Patent Application Publication
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`Feb . 28 , 2019 Sheet 18 of 21
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`US 2019 / 0068308 A1
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`
`
`
`
`
`
`maximum DMRS symbol length ? ( DL - DMRS - max - len , UL - DMRS - max - len )
`
`K30
`
`DL - OMRS - config - type or UL - OMRS - config - type is 2
`
`KOO
`
`k10
`
`
`
`
`
`containing information associated with DMRS type2 one / two VE receive DMRS table
`
`symbol pattern )
`
`
`
`DL - DMRS - max - len or UL - DMRS - max - len is 2
`
`
`
`containing information associated with DMRS type2 UE receive DMRS table
`
`
`one symbol pattern )
`
`
`
`
`
`
`
`
`containing information associated with DMRS type1 one / two UE receive DMRS table
`
`symbol pattern )
`
`
`
`
`
`
`DL - DMRS - max - len or UL - DMRS - max - len is 1
`
`FIG . 12 start
`
`
`
`
`
`UE receive DMRS information ( DL - DMRS - Config - type , UL - DMRS - Config - type , DL - DMRS - max - len , UL - DMRS - max - len , etc . )
`
`
`
`DMRS type ? ( DL - DMRS - Config - type , UL - DMRS - config - type )
`
`DL - DMRS - max - len or UL - DMRS - max - len is 2
`
`KU
`
`DL - DMRS - Config - type or UL - DMRS - config - type is 1
`
`
`
`maximum DMRS symbol length ? ( DL - DMRS - max - len , UL - DMRS - max - len )
`
`
`
`
`
`
`
`containing information associated with DMRS type1 on symbol UE receive DMRS table
`pattern )
`
`
`
`
`
`
`DL - DMRS - max - len or UL - OMRS - max - len is 1
`
`Ex.1006
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`Feb . 28 , 2019 Sheet 19 of 21
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`method 2
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`method 2
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`DL - DMRS - config - type or UL - DMRS - config - type
`
`DL - DMRS - max - len or UL - DMRS - max - len
`
`Method 1
`
`method 2
`
`
`
`maximum DMRS symbol length
`
`
`
`
`
`Method 1
`
`method 2
`
`131
`
`FIG . 13
`
`type1
`
`
`
`DMRS type ?
`
`type2
`
`Method 1
`
`Method 1
`
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`FIG . 14
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`1802
`
`processor
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`1800
`
`receiver
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`1804
`
`transmitter
`
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`Feb . 28 , 2019 Sheet 21 of 21
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`US 2019 / 0068308 A1
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`FIG . 15
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`1903
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`processor
`
`1901
`
`receiver
`
`1905
`
`transmitter
`
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`US 2019 / 0068308 A1
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`Feb . 28 , 2019
`
`DMRS PORT GROUPING METHOD AND
`APPARATUS FOR USE IN WIRELESS
`CELLULAR COMMUNICATION SYSTEM
`CROSS - REFERENCE TO RELATED
`APPLICATION ( S )
`[ 0001 ] This application is based on and claims priority
`under 35 U . S . C . $ 119 ( a ) to Korean Patent Application
`Serial No . 10 - 2017 - 0107485 , which was filed on Aug . 24 ,
`2017 in the Korean Intellectual Property Office , Korean
`Patent Application Serial No . 10 - 2017 - 0111949 , which was
`filed on Sep . 1 , 2017 in the Korean Intellectual Property
`Office , Korean Patent Application Serial No . 10 - 2017
`0128078 , which was filed on Sep . 29 , 2017 in the Korean
`Intellectual Property Office , and Korean Patent Application
`Serial No . 10 - 2017 - 0149873 , which was filed on Nov . 10 ,
`2017 in the Korean Intellectual Property Office , the entire
`disclosure of each of which is incorporated herein by
`reference .
`
`BACKGROUND
`
`1 . Field
`[ 0002 ] The present disclosure relates , generally , to a wire
`less communication system , and more particularly , to a
`method for a base station to group demodulation reference
`signal ( DMRS ) ports and transmit DMRS port group infor
`mation to a terminal .
`2 . Description of the Related Art
`To meet the demand for wireless data traffic having
`[ 0003 ]
`increased since deployment of 4G communication systems ,
`efforts have been made to develop an improved 5G or
`pre - 56 communication system . Therefore , the 5G or pre - 5G
`communication system is also called a " Beyond 4G Net
`work ' or a ' Post LTE System ' . The 5G communication
`system is considered to be implemented in higher frequency
`( mm Wave ) bands , e . g . , 60 GHz bands , so as to accomplish
`higher data rates . To decrease propagation loss of the radio
`waves and increase the transmission distance , the beam
`forming , massive multiple - input multiple - output ( MIMO ) ,
`Full Dimensional MIMO ( FD - MIMO ) , array antenna , an
`analog beam forming , large scale antenna techniques are
`discussed in 5G communication systems . In addition , in 5G
`communication systems , development for system network
`improvement is under way based on advanced small cells ,
`cloud Radio Access Networks ( RANs ) , ultra - dense net
`works , device - to - device ( D2D ) communication , wireless
`backhaul , moving network , cooperative communication ,
`Coordinated Multi - Points ( COMP ) , reception - end interfer
`ence cancellation and the like . In the 3G system , Hybrid
`FSK and QAM Modulation ( FQAM ) and sliding window
`superposition coding ( SWSC ) as an advanced coding modu
`lation ( ACM ) , and filter bank multi carrier ( FBMC ) , non
`orthogonal multiple access ( NOMA ) , and sparse code mul
`tiple access ( SCMA ) as an advanced access technology have
`been developed .
`00041 The Internet , which is a human centered connec
`tivity network where humans generate and consume infor
`mation , is now evolving to the Internet of Things ( IoT )
`where distributed entities , such as things , exchange and
`process information without human intervention . The Inter
`net of Everything ( IoE ) , which is a combination of the IoT
`
`technology and the Big Data processing technology through
`connection with a cloud server , has emerged . As technology
`elements , such as " sensing technology ” , “ wired / wireless
`communication and network infrastructure ” , “ service inter
`face technology ” , and “ Security technology ” have been
`demanded for IoT implementation , a sensor network , a
`Machine - to - Machine ( M2M ) communication , Machine
`Type Communication ( MTC ) , and so forth have been
`recently researched . Such an IoT environment may provide
`intelligent Internet technology services that create a new
`value to human life by collecting and analyzing data gen
`erated among connected things . IoT may be applied to a
`variety of fields including smart home , smart building , smart
`city , smart car or connected cars , smart grid , health care ,
`smart appliances and advanced medical services through
`convergence and combination between existing Information
`Technology ( IT ) and various industrial applications .
`0005 ]
`In line with this , various attempts have been made
`to apply 5G communication systems to IoT networks . For
`example , technologies such as a sensor network , Machine
`Type Communication ( MTC ) , and Machine - to - Machine
`( M2M ) communication may be implemented by beamform
`ing , MIMO , and array antennas . Application of a cloud
`Radio Access Network ( RAN ) as the above - described Big
`Data processing technology may also be considered to be as
`an example of convergence between the 5G technology and
`the IoT technology .
`10006 ]
`In a wireless communication system , a base station
`transmits a reference signal for use by a terminal in esti
`mating a channel . The terminal may perform channel esti
`mation based on the reference signal and demodulate
`received signals with the channel estimation result . The
`terminal may also estimate channel condition base on the
`reference signal and report the estimated channel condition
`to the base station . Unlike the legacy LTE systems , the 5th
`generation ( 5G ) wireless communication systems are
`designed to support an increased number of orthogonal
`DMRS antenna ports , an increased number of cell - IDs , an
`increased channel bandwidth , various subcarrier spacings ,
`slot - based transmission and slot aggregation , DMRS bun
`dling in time domain , and a configurable DMRS structure . In
`order to support such features , the base station has to
`generate DMRS and transmit DMRS - related information to
`a terminal in a method different from that currently being
`used for the legacy LTE systems .
`SUMMARY
`[ 0007 ] The present disclosure has been made to address at
`least the disadvantages described above and to provide at
`least the advantages described below .
`[ 0008 ] An aspect of the disclosure provides a DMRS port
`grouping and signaling method in a 50 wireless communi
`cation system supporting non - coherent joint transmission
`( NC - JT ) . An aspect of the disclosure provides a method for
`generating additional DMRS and signaling additional
`DMRS information in the 5G wireless communication sys
`tem .
`In accordance with an aspect of the disclosure ,
`[ 0009 ]
`there is provided a method of a terminal in
`a wireless
`communication system . The method includes identifying
`demodulation reference signal ( DMRS ) type information
`and DMRS symbol length information , identifying port
`number information for receiving a DMRS and receiving the
`DMRS based on the DMRS type information , the DMRS
`
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`symbol length information and port number information ,
`wherein the port number information indicates a port num
`ber for the terminal in DMRS information including param
`eters for code division multiplexing ( CDM ) group informa
`tion , offset information , frequency - domain orthogonal cover
`code ( OCC ) information , and time - domain OCC informa
`tion corresponding respectively to multiple port numbers ,
`and wherein the DMRS information is defined per DMRS
`type .
`[ 0010 ]
`In accordance with an aspect of the disclosure ,
`there is provided a terminal in
`a wireless communication
`system . The terminal includes a transceiver and a controller
`operably connected to the transceiver and configured to
`identified demodulation reference signal ( DMRS ) type
`information and DMRS symbol length information , identi
`fied port number information for receiving a DMRS , and
`control the transceiver to receive the DMRS based on the
`DMRS type information , the DMRS symbol length infor
`mation and port number information , wherein the port
`number information indicates a port number for the terminal
`in DMRS information including parameters for code divi
`sion multiplexing ( CDM ) group information , offset infor
`mation , frequency - domain orthogonal cover code ( OCC )
`information , and time - domain OCC information corre
`sponding respectively to multiple port numbers , and wherein
`the DMRS information is defined per DMRS type .
`[ 0011 ]
`In accordance with an aspect of the disclosure ,
`there is provided a method of a base station in a wireless
`communication system . The method includes transmitting a
`first message associated with demodulation reference signal
`( DMRS ) type information and DMRS symbol length infor
`mation , transmitting a second message including port num
`ber information for receiving a DMRS by a terminal and
`transmitting the DMRS to the terminal based on the infor
`mation included in the first and second messages , wherein
`the port number information indicates a port number for the
`terminal in DMRS information including parameters for
`code division multiplexing ( CDM ) group information , offset
`information , frequency - domain orthogonal cover code
`( OCC ) information , and time - domain OCC information
`corresponding respectively to multiple port numbers , and
`wherein the DMRS information is defined per DMRS type .
`[ 0012 ]
`In accordance with an aspect of the disclosure ,
`there is provided a base station in a wireless communication
`system . The base station includes a transceiver and a con
`troller operably connected to the transceiver and configured
`to control the transceiver to transmit a first message asso
`ciated with demodulation reference signal ( DMRS ) type
`information and DMRS symbol length information , transmit
`a second message including port number information for
`receiving a DMRS by a terminal , and transmit the DMRS to
`the terminal based on the information included in the first
`and second messages , wherein the port number information
`indicates a port number for the terminal in DMRS informa
`tion including parameters for code division multiplexing
`( CDM ) group information , offset information , frequency
`domain orthogonal cover code ( OCC ) information , and
`time - domain OCC information corresponding respectively
`to multiple port numbers , and wherein the DMRS informa
`tion is defined per DMRS type .
`BRIEF DESCRIPTION OF THE DRAWINGS
`10013 ]
`The above and other aspects , features and advan -
`tages of certain embodiments of the disclosure will be more
`
`apparent from the following detailed description taken in
`conjunction with the accompanying drawings , in which :
`10014 ]
`FIG . 1
`is a diagram of a basic time - frequency
`resource structure for transmitting downlink data or control
`channels in the legacy LTE / LTE - advanced ( LTE - A ) system ;
`[ 0015 ] . FIG . 2 is a diagram of a basic time - frequency
`resource structure of the radio resource for data and / or
`control information in uplink of LTE and LTE - A systems ;
`[ 0016 ]
`FIG . 3 is a diagram of radio resources correspond
`ing to one resource block ( RB ) as a smallest downlink
`scheduling unit in the LTE / LTE - A system ;
`[ 0017 ] FIG . 4 is a diagram of patterns available for Typel ,
`in an antenna port mapping method , according to an embodi
`ment ;
`[ 0018 ]
`FIG . 5 is a diagram of patterns available for Type2 ,
`in an antenna port mapping method , according to an embodi
`ment ;
`[ 0019 ]
`FIG . 6A is a flowchart of a method of a gateway
`node B ( GNB ) and a user equipment ( UE ) , according to an
`embodiment ;
`[ 0020 ] FIG . 6B is a diagram of CDM with OCC of length
`4 , according to an embodiment ;
`[ 0021 ] FIGS . 7A to 7C are diagrams of a power imbalance
`problem ;
`[ 0022 ] . FIG . 8 is a flowchart of a method of a UE operation
`for DMRS port grouping , according to an embodiment ;
`50023 ] FIGS . 9A to 9B are flowcharts of a method for a UE
`to receive information on a number of CDM groups and
`operate based on the received information , according to an
`embodiment ;
`[ 0024 ] FIGS . 10A to 10C are diagrams of a signaling
`overhead reduction method , according to the embodiment ;
`[ 0025 ] FIG . 11 is a diagram of a multi - user MIMO ( MU
`MIMO ) transmission with multiple transmission points
`( TPs ) , according to an embodiment ;
`[ 0026 ] FIG . 12 is a flowchart of a DMRS table interpre
`tation method of a UE , according to an embodiment ;
`[ 0027 ] FIG . 13 is a flowchart of a method for selecting a
`DMRS table determination method , according to an embodi
`ment ;
`[ 0028 ] FIG . 14 is a diagram of a UE , according to an
`embodiment ; and
`[ 0029 ]
`FIG . 15 is a diagram of a gNB , according to an
`embodiment .
`
`DETAILED DESCRIPTION
`[ 0030 ) Embodiments of the disclosure will be described
`herein below with reference to the accompanying drawings .
`However , the embodiments of the disclosure are not limited
`to the specific embodiments and should be construed as
`including all modifications , changes , equivalent devices and
`methods , and / or alternative embodiments of the present
`disclosure . In the description of the drawings , similar ref
`erence numerals are used for similar elements .
`[ 0031 ] The terms “ have , " " may have , " “ include , " and
`“ may include ” as used herein indicate the presence of
`corresponding features ( for example , elements such as
`numerical values , functions , operations , or parts ) , and do not
`preclude the presence of additional features .
`[ 0032 ] The terms “ A or B , " " at least one of A or / and B , "
`or “ one or more of A or / and B ” as used herein include all
`possible combinations of items enumerated with them . For
`example , “ Aor B , " " at least one of A and B , ” or “ at least one
`
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`of A or B ” means ( 1 ) including at least one A , ( 2 ) including
`at least one B , or ( 3 ) including both at least one A and at least
`one B .
`[ 0033 ] The terms such as “ first ” and “ second ” as used
`herein may use corresponding components regardless of
`importance or an order and are used to distinguish a com
`ponent from another without limiting the components . These
`terms may be used for the purpose of distinguishing one
`element from another element . For example , a first user
`device and a second user device may indicate different user
`devices regardless of the order or importance . For example ,
`a first element may be referred to as a second element
`without departing from the scope the disclosure , and simi
`larly , a second element may be referred to as a first element .
`[ 0034 ]
`It will be understood that , when an element ( for
`example , a first element ) is “ ( operatively or communica
`tively ) coupled with / to ” or “ connected to ” another element
`( for example , a second element ) , the element may be
`directly coupled with / to another element , and there may be
`an intervening element ( for example , a third element )
`between the element and another element . To the contrary , it
`will be understood that , when an element ( for example , a
`first element ) is “ directly coupled with / to ” or “ directly
`connected to ” another element ( for example , a second ele
`ment ) , there is no intervening element ( for example , a third
`element ) between the element and another element .
`[ 0035 ] The expression “ configured to ( or set to ) ” as used
`herein may be used interchangeably with “ suitable for , "
`“ having the capacity to , " " designed to , " " adapted to , ” “ made
`to , " or " capable of ” according to
`a context . The term
`" configured to ( set to ) " does not necessarily mean “ specifi
`cally designed to ” in a hardware level . Instead , the expres
`sion " apparatus configured to . . . ” may mean that the
`apparatus is capable of . . . ” along with other devices or
`parts in a certain context . For example , " a processor con
`figured to ( set to ) perform A , B , and C ” may mean a
`dedicated processor ( e . g . , an embedded processor ) for per
`forming a corresponding operation , or a generic - purpose
`processor ( e . g . , a central processing unit ( CPU ) or an
`application processor ( AP ) ) capable of performing a corre
`sponding operation by executing one or more software
`programs stored in a memory device .
`[ 0036 ] The terms used in describing the various embodi
`ments of the disclosure are for the purpose of describing
`particular embodiments and are not intended to limit the
`di