1111111111111111 IIIIII IIIII 111111111111111 1111111111 11111 11111 lllll 111111111111111 11111111
`US 20170289981Al
`
`c19) United States
`c12) Patent Application Publication
`KIM et al.
`
`c10) Pub. No.: US 2017 /0289981 Al
`Oct. 5, 2017
`(43) Pub. Date:
`
`(54) METHOD AND APPARATUS FOR
`TRANSMITTING AND RECEIVING
`FEEDBACK IN WIRELESS
`COMMUNICATION SYSTEM
`
`(71) Applicant: Samsung Electronics Co., Ltd.,
`Suwon-si (KR)
`
`(72)
`
`Inventors: Jaewon KIM, Seoul (KR); Eunyong
`KIM, Yongin-si (KR); Jeehwan NOH,
`Suwon-si (KR); Hyunseok RYU,
`Yongin-si (KR); Hyukmin SON,
`Hanam-si (KR); Hyunkyu YU,
`Suwon-si (KR); Hyunil YOO, Suwon-si
`(KR)
`
`(21) Appl. No.: 15/477,600
`
`(22) Filed:
`
`Apr. 3, 2017
`
`Related U.S. Application Data
`
`(60) Provisional application No. 62/317,943, filed on Apr.
`4, 2016.
`
`(30)
`
`Foreign Application Priority Data
`
`Nov. 14, 2016
`
`(KR) ........................ 10-2016-0151368
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`H04W72/04
`H04L5/14
`(52) U.S. Cl.
`CPC ............. H04W 721044 (2013.01); H04L 5114
`(2013.01); H04W 721042 (2013.01); H04W
`7210413 (2013.01)
`
`(2006.01)
`(2006.01)
`
`(57)
`
`ABSTRACT
`
`The present disclosure relates to a pre-5 th-generation (5G) or
`5G communication system to be provided for supporting
`higher data rates beyond 4th -generation ( 4G) communica(cid:173)
`tion system such as long term evolution (LTE). In a feedback
`method of a terminal, receiving a first subframe from a base
`station, detecting, from the first subframe, downlink control
`information (DCI) including transmission timing informa(cid:173)
`tion and frequency resource information for feedback, cre(cid:173)
`ating feedback information for data decoding of the first
`subframe to be transmitted in a second subframe determined
`based on the DCI, and transmitting the feedback informa(cid:173)
`tion, based on a time resource indicated from the transmis(cid:173)
`sion timing information and a frequency resource indicated
`from the frequency resource information in the DCI.
`
`101
`!
`
`102
`
`! Suoframe #N ! !
`
`#!l+1
`
`103
`! I #N+2
`
`104
`
`105
`
`106
`
`1, • . /
`
`107
`
`#N+5
`
`#fl+6
`
`11
`
`1~0
`
`108
`
`/c_)
`
`109
`
`_ _)
`
`110
`
`#N+7 -~ #N+9
`
`xPUSCH
`
`xPUSCH
`
`xPUSCH
`
`xPUSCH
`
`"" = c.:,
`
`1
`
`APPLE 1005
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 1 of 14
`
`US 2017/0289981 Al
`
`2
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 2 of 14
`
`US 2017/0289981 Al
`
`= + = '¾,
`
`·~ · · ·
`·.+· .. '
`
`··~·
`
`
`
`· · • · .. = . · •. ·.···.•· ...
`
`·.
`
`N
`
`= + = '%:
`
`.,_,
`c:::
`co ,-..,..~~,..,.,
`Cl i ' : . , LhLh-""-,J
`ro ,-!·';-,,:::-..;r..;r-,',?
`....,
`t'iJ
`'C
`....I
`i:::l
`/
`I
`
`\.,~
`
`'
`
`\
`\
`
`3
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 3 of 14
`
`US 2017/0289981 Al
`
`FIG. 3
`
`310
`'
`,-'
`
`Base station
`
`)
`
`320
`r
`Terminal
`
`Transmit DCI and data
`
`-----335
`
`Detect (cid:143) Cl and decode data
`
`~-
`
`create feedback information
`
`~-,.345
`
`Transmit feedback information
`
`""-350
`
`4
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 4 of 14
`
`US 2017/0289981 Al
`
`FIG. 4
`
`)
`
`Start
`t
`Receive signal
`
`+
`Detect (cid:143) Cl from received signal
`
`+
`Decode data
`
`+
`Create feedbacK information
`
`+
`Transmit feedback information
`
`+
`End
`
`)
`
`--.___. -410
`
`_...._,___ __ ·420
`
`-'-. ~430
`
`,...,,_
`
`-------450
`
`5
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 5 of 14
`
`US 2017/0289981 Al
`
`FIG. 5
`
`Start
`
`Create (cid:143) Cl and data
`
`Transmit (cid:143) Cl and data
`
`-510
`
`--·520
`
`Receive feedback information
`
`-"-~530
`
`Retransmit based on feedback
`
`End
`
`6
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 6 of 14
`
`US 2017/0289981 Al
`
`FIG. 6
`
`41:lit
`
`6bit
`
`81:lit
`
`a,
`
`7
`
`

`

`QO
`1,0
`1,0
`QO
`N
`0
`~
`0 ....
`N
`rJJ
`c
`
`> ....
`....
`
`.i;...
`
`....
`0 ....
`('D ....
`rJJ =(cid:173)
`
`-....J
`
`('D
`
`N
`~Ul
`~
`(')
`0
`
`0 ....
`
`-....J
`
`.... 0 =
`""O = O" -....
`.... 0 =
`t "e -....
`
`~ ....
`
`(')
`
`~ ....
`
`(')
`
`('D = ....
`~ ....
`""O
`
`0000
`
`0
`[]
`
`ACK/NACK update @ subframe N
`Initialization @ Subframe N
`
`Bitmap index
`xPUCCH resource index : i
`xPUGCH su!Jframe index offset : koi1set
`HARO process number
`
`l lli'UCCH :: {O, '", 15}
`
`B= 4
`
`koefaul!::: 3
`
`Parameters
`
`@ Subframe N + 3
`on xPUCCH index 1
`"· HARQ reoorting
`")
`
`K de/auit = 3
`
`@Subframe N
`(cid:143)l om detection
`
`DCI·~,,--
`Subframe index : N
`
`N+9 N+10 N+11
`
`N+B
`
`N+7
`
`N+6
`
`N+5
`
`N+4
`
`N+3
`
`N+2
`
`N+1
`
`FIG. 7
`
`8
`
`

`

`QO
`1,0
`1,0
`QO
`N
`0
`~
`0 ....
`N
`rJJ
`c
`
`> ....
`....
`
`....
`0 ....
`QO
`.....
`rJJ =(cid:173)
`
`('D
`('D
`
`.i;...
`
`000
`0000
`
`ACK/NACK update @ subframe N + 1
`Initialization@ Subframe N +1
`Bitmao update forHARQ rnporung N+7
`
`Under PHY processing for xPUCCH transmission @ N+3
`
`2
`3
`
`xooo
`0000
`
`0
`
`0
`0
`
`ACK/NACK update @ subframe N
`lnitiali2ation @ Subframe N
`
`Bitmap index
`xPUCCH resource index : i
`xPUCCH subframe index offset : kot1set
`HARO process numMr
`
`0 ....
`
`-....J
`
`N
`~Ul
`:-+-
`0
`
`(')
`
`xPUCCH tx timing {K 011set = 31
`
`Additional offset for
`
`---•-----
`
`K default = 3
`
`--
`@ Subf rnme N+ 1
`Dl (cid:143)Cl detection
`
`(cid:141)-
`
`N+6
`
`N+5
`
`N+4
`
`N+3
`
`N+2
`
`\ / N+l
`OCI
`
`[
`
`Subframe index : N
`
`.... 0 =
`""O = O" -....
`.... 0 =
`t "e -....
`
`~ .....
`
`(')
`
`('D = .....
`~ .....
`""O
`
`~ .....
`
`(')
`
`fwuc~~ = {O, '", 15}
`
`B= 4
`
`.
`
`Kdera~lt;;;; 3
`
`.
`
`Parameters
`
`N+9 N+10 N+11
`
`N+ 7 N+8
`
`@ Subframe N + 7
`Oil xPUCCH index 2
`' HARO reporting
`-;
`
`FIG. 8
`
`9
`
`

`

`QO
`1,0
`1,0
`QO
`N
`0
`~
`0 ....
`N
`rJJ
`c
`
`> ....
`....
`
`xvoo
`xooo
`0000
`
`ACK/NACK uPdate @ subframe N +2
`ACK/NACK update @ subframe N + 1
`Initialization @ Subframe tV + 1
`Bitmao uodate for HARO reoorting @ N + 7
`
`Under PHY processing for xPUCCH transmission @ N+3
`xooo
`0000
`
`ACK/NACK update @ subframe N
`lnitializatiOn @ Subframe N
`
`....
`0 ....
`.....
`rJJ =(cid:173)
`
`1,0
`
`('D
`('D
`
`.i;...
`
`0 ....
`
`-....J
`
`N
`~Ul
`:-+-
`0
`
`(')
`
`.... 0 =
`""O = O" -....
`.... 0 =
`t "e -....
`
`~ .....
`
`(')
`
`('D = .....
`~ .....
`""O
`
`~ .....
`
`(')
`
`0
`~,
`3
`1
`N+l I @N+2
`
`2
`2
`2
`
`I
`I
`I
`
`0
`
`0
`0
`
`Bitmap index
`xPUCCH resource index : i
`xPUCCH subframe index offset : kottset
`HARO process numoer
`
`xPUCCH tx timing [K onset = 21
`
`Additional offset for
`
`kdefault = 3
`
`J Jl!!UeCH ::: {O, ···, 15}
`
`B=4
`
`kdefautt "'3
`
`Parameters
`
`@ Subframe N + 7
`on xPUCCH index 2
`HARO reoorting
`
`',
`
`@ Subframe N+2
`DL (cid:143)Cl detection
`
`N+ 10 N+ 11
`
`N+9
`
`N+ 7 N+8
`
`N+B
`
`N+5
`
`N+4
`
`N+3
`
`/ N+2
`\
`(cid:143)Cl
`
`N+1
`
`Subframe index : N
`
`FIG. 9
`
`10
`
`

`

`QO
`1,0
`1,0
`QO
`N
`0
`~
`0 ....
`N
`rJJ
`c
`
`> ....
`....
`
`XY 0
`XYO(cid:143)
`xOOO
`mmo
`
`ACK/NACK update @ subframe N +3
`ACK/NACK update @ subframe N +2
`ACK/t~ACK update @ subframe N + 1
`Initialization @ Subframe :v + 1
`Bitmao update for HARO reporting @ N + 7
`
`1
`N+1 @N+2 @N+3
`
`2
`1
`3
`
`2
`2
`2
`
`0
`2
`v
`'J
`
`I
`
`I
`
`.... 0 =
`""O = O" -....
`.... 0 =
`t "e -....
`
`~ .....
`
`(')
`
`('D = .....
`~ .....
`""O
`
`....
`0 ....
`0
`....
`.....
`rJJ =(cid:173)
`
`('D
`('D
`
`.i;...
`
`0 ....
`
`-....J
`
`N
`~Ul
`:-+-
`0
`
`(')
`
`~ .....
`
`(')
`
`lxrUCl}I ::: {O, .. \ 15}
`
`B= 4
`
`koefault "'3
`
`Parameters
`
`Under PHY processing for xPUCCH transmission @ N+3
`
`000
`IJO!JO
`
`0
`
`0
`0
`
`i"
`
`/
`
`ACK/NACK update @ subframe N
`Initialization @ Subframe N
`
`Bitmap index
`xPUCCH resource index : i
`xPUCCH subframe index offset : koflset
`HARO process number
`
`xPUCCH tx timing [k offset = 11
`
`Additional offset for
`
`kdetault = 3
`
`@ Subframe N+3
`DL (cid:143)Cl detection
`
`1\1+1(cid:143) N+11
`
`N+9
`
`N+ 7 N+8
`
`N+6
`
`N+5
`
`N+4
`
`N+2 ) N+3
`
`N+1
`
`DC!
`
`Subframe index ; N
`
`FIG. 10
`
`@ Sut:lf rame N + 7
`on xPUCCH index 2
`" HARO reporting
`I
`-,
`
`11
`
`

`

`QO
`1,0
`1,0
`QO
`N
`0
`~
`0 ....
`N
`rJJ
`c
`
`> ....
`....
`
`....
`0 ....
`....
`....
`.....
`rJJ =(cid:173)
`
`('D
`('D
`
`.i;...
`
`N
`~Ul
`~
`(')
`0
`
`0 ....
`
`-....J
`
`2
`
`(cid:143)
`
`4
`
`.. @111+4
`
`3
`1
`N+1 @N+2 @N+3
`
`2
`2
`1
`
`0
`n
`
`1
`2
`2
`2
`
`.... 0 =
`""O = O" -....
`.... 0 =
`t "e -....
`
`~ .....
`
`(')
`
`('D = .....
`~ .....
`""O
`
`~ .....
`
`(')
`
`J,rnccH "'{O, ... , 15}
`
`B=4
`
`kae1ai11t =3
`
`Parameters
`
`@ Subf rnme N + 7
`on xPUCCH index 2
`HARO reporting
`
`!
`.,!
`
`N+9 N+i(cid:143) N+i 1
`
`N+ 7 N+8
`
`N+B
`
`N+5
`
`FIG. 11
`
`N+3 ) N+4
`
`!
`
`00
`
`N+2
`
`N+1
`
`Subframe index : N
`
`0
`
`2
`
`I
`
`xnw
`lO/ z(l
`xyOO
`xooo
`0000
`
`()
`
`0
`0
`
`.:,:·,:·.<;·,;
`
`k defaUlt = 3
`
`@ Subframe N+4
`DL (cid:143)Cl detection
`
`ACK/NACK update @ subframe N +4
`ACK/NACK update @ subframe N +3
`ACKiNACK update @ subframe N +2
`ACK/NACK update @ subframe N + 1
`Initialization @ Subframe N + 1
`
`Bitmap index
`xPUCCH resource index : i
`xPUCCH subframe index offset : .konset
`HARO process num(cid:143)er
`
`12
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 12 of 14 US 2017/0289981 Al
`
`FIG. 12
`
`Start
`
`1205
`
`j
`
`n+1
`
`Receive n-th subframe and detect DGI
`
`1215
`
`/_j
`
`Prepare xPUCCH transmission 1-t--.---N_O--<=
`
`1210
`
`1220
`
`J
`
`Extract HARO related information from
`detected (cid:143) Cl lxPUCCH TX
`resource and bitmap index]
`
`1225
`
`Call bitmap message corresnonding
`to PUCCH Tx resource
`
`1230
`
`NO
`
`~ te for bitma~~
`message?
`
`1235
`,.I
`
`Extract information reauired for data
`decoding from detected DC! and
`oerf orm decoding
`
`1240
`__J
`Create 1 bit HARO information r·1" on decoding
`success, "O'' on failure]
`
`1245
`___)
`
`Update 1 bit HARO information at
`location corresponding to bitmap
`index within called bitmap message
`
`13
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 13 of 14 US 2017/0289981 Al
`
`FIG. 13
`
`1310
`~
`
`Transceiver Unit
`
`1330
`
`I
`,-'
`
`Control Unit
`
`14
`
`

`

`Patent Application Publication
`
`Oct. 5, 2017 Sheet 14 of 14 US 2017/0289981 Al
`
`FIG. 14
`
`1410
`~
`
`Transceiver Unit
`
`1430
`
`I
`,-'
`
`Control Unit
`
`15
`
`

`

`US 2017/0289981 Al
`
`Oct. 5, 2017
`
`1
`
`METHOD AND APPARATUS FOR
`TRANSMITTING AND RECEIVING
`FEEDBACK IN WIRELESS
`COMMUNICATION SYSTEM
`
`CROSS-REFERENCE TO RELATED
`APPLICATION(S)
`
`[0001] This application claims the benefit under 35 U.S.C.
`§119(e) of a U.S. Provisional application filed on Apr. 4,
`2016 in the U.S. Patent and Trademark Office and assigned
`Ser. No. 62/317,943, and under 35 U.S.C. §119(a) of a
`Korean patent application filed on Nov. 14, 2016 in the
`Korean Intellectual Property Office and assigned Serial
`number 10-2016-0151368, the entire disclosure of each of
`which is hereby incorporated by reference.
`
`TECHNICAL FIELD
`
`[0002] The present disclosure relates to a method and
`apparatus for transmitting and receiving feedback in a
`wireless communication system, especially, in a time divi(cid:173)
`sion duplex (TDD) frame structure.
`
`BACKGROUND
`
`[0003] To meet the demand for wireless data traffic that
`has increased since deployment of 4th generation ( 4G) com(cid:173)
`munication systems, efforts have been made to develop an
`improved 5th generation (5G) or pre-5G communication
`system. Therefore, the 5G or pre-5G communication system
`is also called a 'Beyond 4G Network' or a 'Post LTE
`System'.
`[0004] 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 beamforming, massive mul(cid:173)
`tiple-input multiple-output
`(MIMO),
`full dimensional
`MIMO (FD-MIMO), array antenna, an analog beam form(cid:173)
`ing, and large scale antenna techniques are discussed in 5G
`communication systems.
`[0005]
`In addition, in 5G communication systems, devel(cid:173)
`opment for system network improvement is under way
`based on advanced small cells, cloud radio access networks
`(RANs), ultra-dense networks, device-to-device (D2D)
`communication, wireless backhaul, moving network, coop(cid:173)
`erative communication, coordinated multi-points (CoMP),
`reception-end interference cancellation and the like.
`[0006]
`In the 5G system, hybrid FSK and QAM modula(cid:173)
`tion (FQAM) and sliding window superposition coding
`(SWSC) as an advanced coding modulation (ACM), and
`filter bank multi carrier (FBMC), non-orthogonal multiple
`access (NOMA), and sparse code multiple access (SCMA)
`as an advanced access technology have been developed.
`[0007] Meanwhile, it is necessary to define a feedback
`method of a terminal for downlink transmission of a base
`station in an environment where various services capable of
`supporting the 5G communication system coexist.
`[0008] The above information is presented as background
`information only to assist with an understanding of the
`present disclosure. No determination has been made, and no
`assertion is made, as to whether any of the above might be
`applicable as prior art with regard to the present disclosure.
`
`SUMMARY
`
`[0009] Aspects of the present disclosure are to address at
`least the above-mentioned problems and/or disadvantages
`and to provide at least the advantages described below.
`Accordingly, an aspect of the present disclosure is to provide
`a method and apparatus for transmitting and receiving
`feedback in a time division duplex (TDD) frame structure of
`a wireless communication system. Also, the present disclo(cid:173)
`sure provides a method and apparatus for performing a
`hybrid automatic repeat request (HARQ) procedure in a
`dynamic TDD frame structure.
`[0010]
`In accordance with an aspect of the present disclo(cid:173)
`sure, a feedback method of a terminal is provided. The
`feedback method includes receiving a first subframe from a
`base station, detecting, from the first subframe, downlink
`control information (DCI) including transmission timing
`information and frequency resource information for feed(cid:173)
`back, creating feedback information for data decoding of the
`first subframe to be transmitted in a second subframe
`determined based on the DCI, and transmitting the feedback
`information, based on a time resource indicated from the
`transmission timing information and a frequency resource
`indicated from the frequency resource information in the
`DCI.
`[0011]
`In accordance with another aspect of the present
`disclosure, a terminal is provided. The terminal includes a
`transceiver unit configured to transmit or receive a signal,
`and at least one processor configured to receive a first
`subframe from a base station, detect, from the first subframe,
`DCI including transmission timing information and fre(cid:173)
`quency resource information for feedback, create feedback
`information for data decoding of the first subframe to be
`transmitted in a second subframe determined based on the
`DCI, and transmit the feedback information, based on a time
`resource indicated from the transmission timing information
`and a frequency resource indicated from the frequency
`resource information in the DCI.
`[0012]
`In accordance with another aspect of the present
`disclosure, a feedback reception method of a base station is
`provided. The feedback reception method includes creating
`DCI including transmission timing information and fre(cid:173)
`quency resource information for feedback and data in a first
`subframe, transmitting the first subframe containing the DCI
`and the data to a terminal, and receiving feedback informa(cid:173)
`tion from the terminal, based on a time resource indicated
`from the transmission timing information and a frequency
`resource indicated from the frequency resource information
`in the DCI.
`[0013]
`In accordance with another aspect of the present
`disclosure, a base station is provided. The base station
`includes a transceiver unit configured to transmit or receive
`a signal, and at least one processor configured to create DCI
`including transmission timing information and frequency
`resource information for feedback and data in a first sub(cid:173)
`frame, transmit the first subframe containing the DCI and the
`data to a terminal, and receive feedback information from
`the terminal, based on a time resource indicated from the
`transmission timing information and a frequency resource
`indicated from the frequency resource information in the
`DCI.
`[0014]
`In accordance with another aspect of the present
`disclosure, the base station may indicate resources for
`HARQ feedback transmission to the terminal by using the
`
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`Oct. 5, 2017
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`2
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`DCI, and the terminal may transmit an HARQ feedback by
`using the resources indicated by the base station.
`[0015] Other aspects, advantages, and salient features of
`the disclosure will become apparent to those skilled in the art
`from the following detailed description, which, taken in
`conjunction with the annexed drawings, discloses various
`embodiments of the present disclosure.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[0016] The above and other aspects, features, and advan(cid:173)
`tages of certain embodiments of the present disclosure will
`be more apparent from the following description taken in
`conjunction with the accompanying drawings, in which:
`[0017] FIG. 1 is a diagram illustrating a time division
`duplex (TDD) frame structure according to an embodiment
`of the present disclosure;
`[0018] FIG. 2 is a diagram illustrating a method for
`scheduling a subframe according to an embodiment of the
`present disclosure;
`[0019] FIG. 3 is a diagram illustrating a feedback proce(cid:173)
`dure between a base station and a terminal according to an
`embodiment of the present disclosure;
`[0020] FIG. 4 is a diagram illustrating operations of a
`terminal according to an embodiment of the present disclo(cid:173)
`sure;
`[0021] FIG. 5 is a diagram illustrating operations of a base
`station according to an embodiment of the present disclo(cid:173)
`sure;
`[0022] FIG. 6 is a diagram illustrating a bitmap according
`to an embodiment of the present disclosure;
`[0023] FIG. 7 is a diagram illustrating a method for
`creating a bitmap according to an embodiment of the present
`disclosure;
`[0024] FIG. 8 is a diagram illustrating a method for
`creating a bitmap according to another embodiment of the
`present disclosure;
`[0025] FIG. 9 is a diagram illustrating a method for
`creating a bitmap according to still another embodiment of
`the present disclosure;
`[0026] FIG. 10 is a diagram illustrating a method for
`creating a bitmap according to yet another embodiment of
`the present disclosure;
`[0027] FIG. 11 is a diagram illustrating a method for
`creating a bitmap according to further another embodiment
`of the present disclosure;
`[0028] FIG. 12 is a diagram illustrating a feedback method
`of a terminal according to another embodiment of the
`present disclosure;
`[0029] FIG. 13 is a diagram illustrating a terminal accord(cid:173)
`ing to an embodiment of the present disclosure; and
`[0030] FIG. 14 is a diagram illustrating a base station
`according to an embodiment of the present disclosure.
`[0031] Throughout the drawings, it should be noted that
`like reference numbers are used to depict the same or similar
`elements, features, and structures.
`
`DETAILED DESCRIPTION
`
`[0032] The following description with reference to the
`accompanying drawings is provided to assist in a compre(cid:173)
`hensive understanding of various embodiments of the pres(cid:173)
`ent disclosure as defined by the claims and their equivalents.
`It includes various specific details to assist in that under(cid:173)
`standing but these are to be regarded as merely exemplary.
`
`Accordingly, those of ordinary skill in the art will recognize
`that various changes and modifications of the various
`embodiments described herein can be made without depart(cid:173)
`ing from the scope and spirit of the present disclosure. In
`addition, descriptions of well-known functions and con(cid:173)
`structions may be omitted for clarity and conciseness.
`[0033] The terms and words used in the following descrip(cid:173)
`tion and claims are not limited to the bibliographical mean(cid:173)
`ings, but, are merely used by the inventor to enable a clear
`and consistent understanding of the present disclosure.
`Accordingly, it should be apparent to those skilled in the art
`that the following description of various embodiments of the
`present disclosure is provided for illustration purpose only
`and not for the purpose of limiting the present disclosure as
`defined by the appended claims and their equivalents.
`[0034]
`In this present disclosure, terms are defined in
`consideration of functions of the present disclosure and may
`be varied depending on user or operator's intention or
`custom. Therefore, the definition should be made based on
`the contents throughout this description. For the same rea(cid:173)
`son, some elements are exaggerated, omitted or schemati(cid:173)
`cally shown in the accompanying drawings. Also, the size of
`each element does not entirely reflect the actual size. In the
`drawings, the same or corresponding elements are denoted
`by the same reference numerals.
`[0035] The advantages and features of the present disclo(cid:173)
`sure and the manner of achieving them will become apparent
`with reference to the various embodiments described in
`detail below with reference to the accompanying drawings.
`The present disclosure may, however, be embodied in many
`different forms and should not be construed as limited to the
`various embodiments set forth herein. Rather, these various
`embodiments are provided so that this disclosure will be
`thorough and complete, and will fully convey the scope of
`the present disclosure to those skilled in the art. To fully
`disclose the scope of the present disclosure to those skilled
`in the art, and the present disclosure is only defined by the
`scope of the claims.
`[0036]
`It will be understood that each block of the flow(cid:173)
`chart illustrations, and combinations of blocks in the flow(cid:173)
`chart illustrations, may be implemented by computer pro(cid:173)
`gram instructions. These computer program instructions
`may be provided to a processor of a general purpose
`computer, special purpose computer, or other programmable
`data processing apparatus to produce a machine, such that
`the instructions, which are executed via the processor of the
`computer or other programmable data processing apparatus,
`generate means for implementing the functions specified in
`the flowchart block or blocks. These computer program
`instructions may also be stored in a computer usable or
`computer-readable memory that may direct a computer or
`other programmable data processing apparatus to function in
`a particular manner, such that the instructions stored in the
`computer usable or computer-readable memory produce an
`article of manufacture including instruction means that
`implement the function specified in the flowchart block or
`blocks. The computer program instructions may also be
`loaded onto a computer or other programmable data pro(cid:173)
`cessing apparatus to cause a series of operations to be
`performed on the computer or other programmable appara(cid:173)
`tus to produce a computer implemented process such that the
`instructions that are executed on the computer or other
`programmable apparatus provide operations for implement(cid:173)
`ing the functions specified in the flowchart block or blocks.
`
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`3
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`[0037] And each block of the flowchart illustrations may
`represent a module, segment, or portion of code, which
`comprises one or more executable instructions for imple(cid:173)
`menting the specified logical function(s). It should also be
`noted that in some alternative implementations, the func(cid:173)
`tions noted in the blocks may occur out of the order. For
`example, two blocks shown in succession may in fact be
`executed substantially concurrently or the blocks may some(cid:173)
`times be executed in the reverse order, depending upon the
`functionality involved.
`[0038] The term "unit", as used herein, may refer to a
`software or hardware component or device, such as a field
`programmable gate array (FPGA) or application specific
`integrated circuit (ASIC), which performs certain tasks. A
`unit may be configured to reside on an addressable storage
`medium and configured to execute on one or more proces(cid:173)
`sors. Thus, a module or unit may include, by way of
`example, components, such as software components, object(cid:173)
`oriented software components, class components and task
`components, processes, functions, attributes, procedures,
`subroutines, segments of program code, drivers, firmware,
`microcode, circuitry, data, databases, data structures, tables,
`arrays, and variables. The functionality provided for in the
`components and modules/units may be combined into fewer
`components and modules/units or further separated into
`additional components and modules.
`[0039] Efforts have been made to develop an improved 5th
`generation (5G) communication system after commercial(cid:173)
`ization of the 4th generation (4G) communication system.
`The main feature of the 5G communication system is to
`support various service scenarios having different require(cid:173)
`ments in comparison with the 4G communication system.
`These requirements may be a latency, a data rate, a battery
`life, the number of concurrent users, communication cover(cid:173)
`age, and the like.
`[0040] For example, the enhanced mobile broad band
`(eMBB) service aims at a data transmission rate that is 100
`times or more higher than that of the 4G communication
`system, and may be regarded as a service for supporting a
`surge of user data traffic. As another example, the ultra(cid:173)
`reliable and low latency (URLL) service aims at very high
`data transmission/reception reliability and very low latency
`in comparison with the 4G communication system, and may
`be useful for autonomous driving, e-health, drones, and
`other services. As still another example, the massive
`machine-type-communication (mMTC) service aims to sup(cid:173)
`port a greater number of device-to-device communications
`per area in comparison with the 4G communication system,
`and is an evolved service of the 4G MTC such as smart
`metering.
`[0041] The present disclosure relates to a method and
`apparatus for feedback of a terminal with regard to downlink
`transmission of a base station in an environment where
`various services capable of supporting the 5G communica(cid:173)
`tion system coexist.
`In a general cellular system (e.g., the long term
`[0042]
`evolution (LTE) system), the terminal receives a physical
`downlink control channel (PDCCH) transmitted from the
`base station.
`[0043] The PDCCH is transmitted in a control channel
`region on the first, second or third symbol of every subframe
`(1 ms), and the control channel region is transmitted over the
`entire system bandwidth on the frequency axis. For example,
`in a system with a bandwidth of 20 MHz, the control channel
`
`region for the PDCCH occupies the first, second or third
`symbol of the subframe on the time axis and 20 MHz on the
`frequency axis. As another example, in a system with a
`bandwidth of 5 MHz, the control channel region for the
`PDCCH occupies the first, second or third symbol of the
`subframe on the time axis and 5 MHz on the frequency axis.
`In the PDCCH, DCI information such as resource allocation
`information of the terminal is transmitted. The number of
`symbols used for forming the PDCCH may be transmitted to
`the terminal through a separate physical control format
`indication channel (PCFICH). This PCFICH may not be
`present, depending on the communication system.
`[0044] The PDCCH is scrambled with a variety of radio
`network temporary identifications (RNTis) ( or may be
`referred to as a radio identifier) according to the use, and is
`transmitted to the terminal. For example, the P-RNTI is an
`RNTI related to paging, the RA-RNTI is an RNTI related to
`random access, the SI-RNTI is an RNTI related to system
`information, and the C-RNTI is an RNTI related to the
`downlink or uplink resource allocation. The terminal
`receives the PDCCH transmitted at every subframe, per(cid:173)
`forms descrambling through the RNTI, and then decodes the
`PDCCH.
`[0045] Meanwhile, in the 5G communication system, dif(cid:173)
`ferent transmission time interval (TTis) may be considered
`for each service in order to satisfy different requirements for
`each service. For example, in case of the URLL service, it
`is possible to use a shorter TTI (e.g., 0.2 ms) to meet the
`requirement of short latency. In case of the mMTC service,
`it is possible to use a longer TTI ( e.g., 2 ms) to meet the
`requirement of wide coverage (The longer TTI may increase
`coverage because it may transmit longer with a lot of
`energy).
`[0046] The terms used in various embodiments of the
`present disclosure described below may be defined as fol(cid:173)
`lows.
`In various embodiments of the present disclosure,
`[0047]
`feedback information may refer to information that indicates
`whether decoding of data transmitted from the base station
`is successful or not. Instead of the feedback information,
`other terms such as hybrid automatic repeat request (HARQ)
`information, HARQ feedback information, and feedback
`result may be used.
`In various embodiments of the present disclosure,
`[0048]
`transmission timing information for feedback may be
`referred to as transmission time information, time resources,
`offset information, time information, and the like. Frequency
`information ofx physical uplink control channel (xPUCCH)
`for feedback may be referred to as frequency resources,
`frequency information, and the like.
`In various embodiments of the present disclosure,
`[0049]
`resources for feedback may include time resources for
`feedback and frequency resources for feedback. The time
`resources may be indicated based on the transmission timing
`information, and the frequency resources may be indicated
`based on the frequency information.
`[0050] Receiving a subframe may be interpreted as receiv(cid:173)
`ing information, data, and signals that are mapped to the
`subframe or mapped to resources of the subframe.
`[0051] FIG. 1 is a diagram illustrating a time division
`duplex (TDD) frame structure according to an embodiment
`of the present disclosure. A TDD frame shown in FIG. 1 may
`be a dynamic TDD frame. The TDD frame of FIG. 1 is not
`to be construed as a limitation.
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`
`4
`
`[0052] Referring to FIG. 1, the TDD frame according to an
`embodiment may include a plurality of subframes 101, 102,
`103, ... , 110, which may constitute a single radio frame. In
`the LTE communication, ten subframes may constitute one
`radio frame. In this embodiment, n 5G subframes may
`constitute one radio frame. For example, the unknown n may
`be 50. The value of n may be set to a different value
`depending on the communication system.
`[0053] A reference numeral 120 denotes an enlarged view
`of the structure of a subframe 105, and a reference numeral
`130 denotes an enlarged view of the structure of a subframe
`109. The reference numeral 120 indicates a subframe includ(cid:173)
`ing a downlink control channel, a downlink data channel,
`and an uplink control channel. The reference numeral 130
`indicates a subframe including a downlink control channel,
`an uplink data channel, and an uplink control channel. In a
`subframe, the horizontal axis is the time domain, and the
`vertical axis is the frequency domain. The horizontal axis
`may be composed of symbols, and the vertical axis may be
`composed of subcarriers. In the 5G system, symbol units and
`subcarrier units may be configured in various ways. A
`subframe including x physical downlink shared channel
`(xPDSCH) may be referred to as a downlink subframe, and
`a subframe including x physical uplink control channel
`(xPUSCH) may be referred to as an uplink subframe. In the
`dynamic TDD system, the base station may directly sched(cid:173)
`ule a subframe to be used as an uplink subframe or a
`downlink subframe. In the dynamic TDD system, after
`downlink control information (DCI) decoding of a received
`subframe, the terminal may identify whether a correspond(cid:173)
`ing subframe is a downlink subframe or an uplink subframe.
`[0054] Referring to the reference numeral 120, a subframe
`may include an xPDCCH region and an xPDSCH region.
`The subframe 120 is a downlink subframe. The xPDCCH is
`a downlink control channel used in the 5G system and may
`be hereinafter referred to as the downlink control channel.
`The xPDSCH is a downlink data channel used in the 5G
`system and may be hereinafter referred to as the downlink
`data channel. The subframe may furt