111111
`
`1111111111111111111111111111111111111111111111111111111111111
`US008885587B2
`
`(12) United States Patent
`Chen et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8,885,587 B2
`Nov. 11,2014
`
`(54) METHOD, BASE STATION, AND USER
`EQUIPMENT FOR FEEDING BACK
`ACKINACK INFORMATION FOR CARRIER
`AGGREGATION
`
`(75)
`
`Inventors: Xiaobo Chen, Shenzhen (CN); Chaojun
`Li, Shenzhen (CN)
`
`(73) Assignee: Huawei Technologies Co., Ltd.,
`Shenzhen (CN)
`
`( *) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.c. 154(b) by 0 days.
`
`(21) Appl. No.: 13/487,172
`
`(22) Filed:
`
`Jun. 2,2012
`
`(65)
`
`Prior Publication Data
`
`US 2012/0236812 Al
`
`Sep. 20, 2012
`
`Related U.S. Application Data
`
`application
`of
`(63) Continuation
`PCT/CN2010/079423, filed on Dec. 3, 2010.
`
`No.
`
`(30)
`
`Foreign Application Priority Data
`
`Dec. 3, 2009
`Mar. 24, 2010
`
`(CN) .......................... 2009 1 0251390
`(CN) .......................... 201010137731
`
`(51)
`
`(2009.01)
`
`Int. Cl.
`H04W72104
`(52) U.S. Cl.
`USPC .......................................................... 370/329
`(58) Field of Classification Search
`USPC .......................................................... 370/329
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`8/2009 Duan et al.
`7,570,970 B2
`200910197630 Al *
`8/2009 Ahn et al.
`..................... 455/522
`4/2010 Kwaket al.
`201010103899 Al
`201210140726 Al * 6/2012 Moon et al. ................... 370/329
`201210155316 Al
`6/2012 Li et al.
`201210224553 Al * 912012 Kimet al. ..................... 370/329
`
`FOREIGN PATENT DOCUMENTS
`
`CN
`CN
`JP
`JP
`RU
`WO
`WO
`
`101594211 A
`1212009
`101998509 A
`3/2011
`2010521942 A
`6/2010
`2010539847 A
`1212010
`2005124991 A
`212007
`2009041785 A2
`4/2009
`2009116760 A2
`912009
`OTHER PUBLICATIONS
`
`First Chinese Office Action of Chinese Application No.
`201010137731.2 mailed Aug. 27, 2012, 7 pages.
`
`(Continued)
`Primary Examiner - Sulaiman Nooristany
`(74) Attorney, Agent, or Firm - Slater & Matsil, L.L.P.
`(57)
`ABSTRACT
`The present invention provides a method, a base station, and
`a user equipment for feeding back ACKINACK information
`for carrier aggregation. The method includes: configuring a
`common field preset in DCI as at least one type of command
`field related to ACKINACK feedback of at least two types of
`command fields related to ACKINACK feedback, where the
`common field can be configured as the command fields
`related to ACKINACK feedback; and sending the DCI to a
`user equipment, so that the user equipment feeds backACKI
`NACK information according to the DCI. The present inven(cid:173)
`tion may realize backward compatibility of the ACKINACK
`information feedback with an LTE system in carrier aggrega(cid:173)
`tion.
`
`11 Claims, 6 Drawing Sheets
`
`Set a common field in DCI, where the common ~
`
`field can be configured as a TPC command field
`and an ART command field
`
`+
`
`Configure the common field in at least one piece of
`DCT transmitted by a system-linked component
`carrier as a TPC command field and configure the
`common field in at least one piccc of DCI
`transmitted by a non-system-linked component
`carrier as an ART command field
`
`2
`~
`
`+
`Send the DCI to a user equipment, so that the user ~
`
`equipment feeds back ACKINACK information
`according to the DCI
`
`3
`
`Samsung Exhibit 1001, Page 1
`
`

`

`US 8,885,587 B2
`Page 2
`
`(56)
`
`References Cited
`
`OTHER PUBLICATIONS
`
`Ericsson, "Details of ACKINAK bundling for TDD," TSG-RAN
`WG 1 #53, RI-082002, Kansas City, MO, May 5-9,2008,6 pages.
`United States Office Action received in U.S. Appi. No. 13/725,413,
`mailed May 15, 2013, 17 pages.
`Second Office Action of Chinese Application No. 201010137731.2
`mailed May 2,2013, 12 pages. (Partial Translation).
`Extended Search Report received in European Patent Application No.
`10834239.5, mailed Jui. 27, 2012, 5 pages.
`International Search Report received in Patent Cooperation Treaty
`Application No. PCT/CN20101079423, mailed Mar. 10, 20ll, 3
`pages.
`Written Opinion of the International Searching Authority received in
`Patent Cooperation Treaty Application No. PCT/CN2010/079423,
`mailed Mar. 10,2011,5 pages.
`CMCC, "UL ACKINACK and CQI Feedback in Carrier Aggrega(cid:173)
`tion," 3GPP TSG RAN WGI Meeting #58, RI-093269, Shenzhen,
`China, Aug. 24-28, 2009, 2 pages.
`Ericsson, et al., "PUCCH Transmission for Carrier Aggregation,"
`3GPP TSG RAN WGI Meeting #58bis, RI-094273, Miyazaki,
`Japan, Oct. 12-16,2009,3 pages.
`Nokia, et ai., "DAI Design for TDD Configuration #5 (9: 1) in ACKI
`NACK Bundling," RI-082615 (revised from RI-8260 1), 3GPP TSG
`
`RAN WG 1 Meeting #53bis, Warzaw, Poland, Jun. 30-Jui. 4, 2008, 7
`pages.
`3m Generation Partnership Project, "Technical Specification Group
`Radio Access Network; Evolved Universal Terrestrial Radio Access
`(E-UTRA); Multiplexing and Channel Coding (Release 8)," 3GPP
`TS 36.212, v8.7.0, May 2009,60 pages.
`3m Generation Partnership Project, "Technical Specification Group
`Radio Access Network; Evolved Universal Terrestrial Radio Access
`(E-UTRA); Physical Layer Procedures (Release 8)," 3GPP TS
`36.213, v8.8.0, Sep. 2009, 77 pages.
`Australian Patent Examination Report received in Application No.
`2010327189, Applicant: Huawei Technologies Co., Ltd., issued Aug.
`9,2013,3 pages.
`3rd Generation Partnership Project; Technical Specification Group
`Radio Access Network; Evolved Universal Terrestrial Radio Access
`(E-UTRA); Physical layer procedures (Release 8), 3GPP TS 36.213,
`V8.6.0, Mar. 2009, 77 pages.
`Extended European Search Report received in Application No.
`13185753.4-1860 mailed Oct. 29, 2013, 6 pages.
`Japanese Office Action for Application No. 2012-541313, mailed
`Nov. 12,2013,5 pages.
`Huawei, "UL ACKINACK Feedback Related DCI Design for Carrier
`Aggregation," 3GPP TSG RAN WG 1 Meeting #60bis, Rl-l 0 1943,
`Beijing, China, Apr. 12-16,2010,4 pages.
`* cited by examiner
`
`Samsung Exhibit 1001, Page 2
`
`

`

`u.s. Patent
`
`Nov. 11,2014
`
`Sheet 1 of 6
`
`US 8,885,587 B2
`
`Configure a common field preset in DCI as at least one
`command field related to ACKINACK feedback of at
`least two command fields related to ACKINACK
`feedback, where the common field can be configured as
`the command fields related to ACKINACK feedback
`
`~
`
`+
`Send the DCI to a user equipment, so that the user ~
`
`equipment feeds back ACKINACK information
`according to the DCI
`
`2
`
`FIG. 1
`
`Downlink
`Downlink
`Downlink
`component carrier-l component carrier-2 component carrier-3
`
`~
`
`- - - - - - - - - - - -
`r
`,
`
`j ~--r-----
`
`Uplink component Uplink component
`carrier-l
`carrier-2
`
`FIG. 2
`
`Samsung Exhibit 1001, Page 3
`
`

`

`PDCCH
`
`PDCCH
`
`PDSCH
`
`Downlink
`component
`carrier-l
`
`POSCH
`
`Downlink
`component
`carrier-2
`
`PDCCH
`
`PDSCH
`
`Downlink
`component carrie,,-
`3
`
`P
`U
`C
`C
`H
`
`P
`U
`C
`C
`H
`
`Uplink component
`carrier-2
`
`FIG. 3
`
`~
`7Jl
`•
`~
`~
`~
`
`~ = ~
`
`z o
`~ ....
`.... ~
`N o ....
`
`.j;o.
`
`('D
`
`rFJ =-('D
`.....
`N
`0 ....
`
`0\
`
`d
`rJl
`QO
`00
`QO
`tit
`11.
`QO
`
`-....l = N
`
`Samsung Exhibit 1001, Page 4
`
`

`

`u.s. Patent
`
`Nov. 11,2014
`
`Sheet 3 of 6
`
`US 8,885,587 B2
`
`be configured as an ARI command field and a DAI
`command field
`
`1
`
`Set a common field in DCI, where the common field can ~
`+
`
`When a bundling feedback mode is adopted, a base
`station configures at least one of common fields in the
`
`DCI transmitted by all downlink component carriers as r0
`
`2
`
`the DAI command field; when a multiplexing feedback
`mode is adopted, the base station configures at least one
`of the common fields in the DCI transmitted by all
`downlink component carriers as the ARI command field
`
`+
`Send the DCI to a user equipment, so that the user r0
`
`equipment feeds back ACKINACK information
`according to the DCI
`
`3
`
`FIG. 4
`
`Set a common field in DCI, where the common ~
`
`field can be configured as a TPC command field
`and an ARI command field
`
`1
`
`+
`
`2
`~.
`
`Configure the common field in at least one piece of
`DCI transmitted by a system-linked component
`carrier as a TPC command field and configure the
`common field in at least one piece of DCI
`transmitted by a non-system-linked component
`carrier as an ARI command field
`
`•
`
`Send the DCI to a user equipment, so that the user ~.
`3
`equipment feeds back ACKINACK information
`according to the DCI
`
`FIG. 5
`
`Samsung Exhibit 1001, Page 5
`
`

`

`u.s. Patent
`
`Nov. 11,2014
`
`Sheet 4 of 6
`
`US 8,885,587 B2
`
`Set a common field in DCI, where the common field
`can be configured as a TPC command field and an
`ARI command field
`
`1
`~
`
`A base station configures the common field in at
`least one piece of DCI transmitted by a downlink
`
`corresponding to PDSCH transmission of the
`downlink PCC as the ARI command field; and
`configures at least one of common fields in the rest
`DCI as the TPC command field
`
`4
`
`•
`PCC and/or the common field in the DCI ~
`,
`
`Send the DCI to a user equipment, so that the user
`equipment feeds back ACKINACK information
`according to the DCI
`
`3
`~.
`
`FIG.5a
`
`Set a common field in DCI, where the common field
`can be configured as a TPC command field and a DAI
`
`1
`~
`
`command field •
`
`Configure the common field in at least one piece of
`DCI transmitted by a system-linked component carrier
`2
`as a TPC command field and configure the common ~
`field in at least one piece of DCI transmitted by a non-
`system-linked component carrier as a DAI command
`
`field •
`
`Send the DCI to a user equipment, so that the user
`equipment feeds back ACKINACK information
`according to the DCI
`
`3
`~.
`
`FIG. 6
`
`Samsung Exhibit 1001, Page 6
`
`

`

`u.s. Patent
`
`Nov. 11,2014
`
`Sheet 5 of 6
`
`US 8,885,587 B2
`
`Set a common field in DCI, where the common field can
`
`field, and an ARI command field
`
`be configured as a TPC command field, a DAI command ~ 1
`+
`
`Configure the common field in at least one piece of DCI
`transmitted by a system-linked downlink component
`carrier as the TPC command field; when a feedback mode
`of ACKINACK information is a bundling feedback mode,
`configure the common field in at least one DCI
`transmitted by a non-system-linked downlink component
`carrier as the DAI command field; or when the feedback
`mode of the ACKINACK information is a multiplexing
`feedback mode, configure the common field in at least
`one piece of DCI transmitted by a non-system-linked
`downlink component carrier as the ARI command field
`
`2 ~.
`
`+
`Send the DCI to a user equipment, so that the user ~.
`3
`equipment feeds back ACKINACK information according
`to the DCI
`
`FIG. 7
`
`Configuring
`module
`
`~----------------------~
`
`81
`
`FIG. 8
`
`Sending
`module
`
`82
`
`Samsung Exhibit 1001, Page 7
`
`

`

`u.s. Patent
`
`Nov. 11,2014
`
`Sheet 6 of 6
`
`US 8,885,587 B2
`
`Receiving
`module
`
`Feedback
`r-----------------------~
`module
`
`91
`
`Determining
`module
`
`92
`
`93
`
`FIG. 9
`
`Samsung Exhibit 1001, Page 8
`
`

`

`US 8,885,587 B2
`
`1
`METHOD, BASE STATION, AND USER
`EQUIPMENT FOR FEEDING BACK
`ACKINACK INFORMATION FOR CARRIER
`AGGREGATION
`
`CROSS-REFERENCE TO RELATED
`APPLICATIONS
`
`This application is a continuation of International Appli(cid:173)
`cation No. PCT/CN2010/079423, filed on Dec. 3, 2010,
`which claims priority to Chinese Patent Application No.
`200910251390.9, filed on Dec. 3, 2009 and Chinese Patent
`Application No. 201010137731.2, filed on Mar. 24, 2010, all
`of which are hereby incorporated by reference in their entire(cid:173)
`ties.
`
`FIELD OF THE INVENTION
`
`The present invention relates to the filed of mobile com(cid:173)
`munications technologies, and in particular to a method, a
`base station, and a user equipment for feeding back ACKI
`NACK information for carrier aggregation.
`
`BACKGROUND OF THE INVENTION
`
`In the hybrid automatic repeat request (Hybrid Automatic
`Repeat Request, HARQ) technology, a data receiver needs to
`feed back acknowledgement/negative-acknowledgement
`(Acknow ledgementiN egative-acknow ledgement,
`ACKI
`NACK) information to a data sender to help to determine 30
`whether data is correctly received. In an uplink direction of a
`3rd Generation Partnership Project (3rd Generation Partner(cid:173)
`ship Project, 3GPP) Evolved Universal Terrestrial Radio
`Access
`(Evolved Universal Terrestrial Radio Access,
`E-UTRA) system, a user equipment feeds back ACKINACK
`information about downlink data reception to a base station
`through a physical uplink control channel (Physical Uplink
`Control Channel, PUCCH). The 3GPP E-UTRA system is
`also known as a Long Term Evolution (Long Term Evolution,
`LTE) system. In the following description, the PUCCH chan(cid:173)
`nel used by the user equipment to feed back ACKINACK
`information about downlink data reception to the base station
`is referred to as an uplink ACK channel.
`In the LTE system, the feedback of the ACKINACK infor(cid:173)
`mation may be controlled through downlink control informa- 45
`tion (Downlink Control Information, DCI). The DCI is used
`to indicate scheduling information transmitted over a PDSCH
`and is transmitted over a physical downlink control channel
`(Physical Downlink Control Channel, PDCCH) correspond(cid:173)
`ing to the physical downlink shared channel (Physical Down- 50
`link Shared Channel, PDSCH) indicated by the DCI. The DCI
`includes a transmission power control (Transmission Power
`Control, TPC) command field, which is used to adjust trans(cid:173)
`mission power of the uplink ACK channel to send the ACKI
`NACK information. The TPC command field is generally 2 55
`bits long. Particularly, in an LTE time division duplex (Time
`Division Duplex, TDD) system, one user equipment may feed
`backACKINACK information corresponding to PDSCH data
`transmission of multiple downlink subframes in one uplink
`subframe. Specifically, the LTE TDD system supports two 60
`ACKINACK information feedback modes, which are an
`ACKINACK multiplexing mode (ACKINACK Multiplexing
`Mode) and an ACKINACK bundling mode (ACKINACK
`Bundling Mode) respectively. In the ACKINACK multiplex(cid:173)
`ing mode, uplink ACKINACK information corresponding to 65
`each PDSCH data transmission is fed back to the base station
`independently. In the ACKINACK bundling mode, uplink
`
`5
`
`2
`ACKINACK information corresponding to multiple times of
`PDSCH data transmission is fed back to the base station
`together after a logic AND operation. To support the ACKI
`NACK bundling mode, a 2-bit downlink assignment index
`(Downlink Assignment Index, DAI) command field is intro(cid:173)
`duced in the DCI and is used to indicate the number of
`PDCCHs that carry the DCI.
`In an LTE-Advanced (LTE-Advanced, LTE-A) system, a
`carrier aggregation technology is chosen to support wider
`10 bandwidth so as to meet requirements of the International
`Telecommunication Union (International Telecommunica(cid:173)
`tion Union, lTU) on a peak data rate of the 4th generation
`communications technology. In the carrier aggregation tech(cid:173)
`nology, the spectrums of two or more component carriers are
`15 aggregated together to get wider transmission bandwidth, and
`every component carrier has an independent HARQ process.
`An LTE-A user equipment may be configured with different
`numbers of uplink and downlink component carriers. When
`the LTE-A user equipment accesses multiple downlink com-
`20 ponent carriers simultaneously, ACKINACK information
`corresponding to the data transmission over PDSCH of every
`downlink component carrier is fed back over the uplink ACK
`channel. When the ACKINACK information corresponding
`to the data transmission of multiple downlink component
`25 carriers needs to be fed back over a same uplink component
`carrier, a problem offeeding back the ACKINACK informa(cid:173)
`tion corresponding to the data transmission of multiple down(cid:173)
`link component carriers over the same uplink component
`carrier needs to be solved.
`With reference to the LTE TDD system, in the LTE-A
`system, when a user equipment is configured with multiple
`downlink component carriers to receive data, feedback of the
`uplink ACKINACK information corresponding to the data
`transmission of the multiple downlink component carriers
`35 may also adopt the ACKINACK multiplexing mode or ACKI
`NACK bundling mode Likewise, the DCI information may be
`adopted to control the feedback of ACKINACK information.
`For example, a TPC command field is used to control the
`transmission power of an uplink component carrier and a DAI
`40 command field is used to support the ACKINACK bundling
`mode.
`Particularly, in a carrier aggregation LTE-A system, con(cid:173)
`sidering the relatively small number of users simultaneously
`scheduled over multiple downlink component carriers, the
`uplink ACK channel assignment for the user equipment may
`be notified by the base station through explicit signaling. One
`manner is that the base station directly notifies the assigned
`uplink ACK channel resources through high-level signaling.
`To increase the statistical multiplexing probability of uplink
`ACK channels of different user equipment, another manner is
`that the base station assigns a group of ACK channel
`resources to the user equipment through high-level signaling
`and adds anACK resource indication (ACK Resource Indi(cid:173)
`cation, ARI) command field to the DCI information carried by
`the PDCCH to further indicate which one of the group of
`high-level assigned uplink ACK channel resources is used
`currently. The ARI command field does not exist in the LTE
`system and needs to be introduced additionally in the LTE-A
`system. The number of bits depends on the number of the
`high-level assigned uplinkACK channel resources, and gen(cid:173)
`erally 2 bits are considered enough.
`In the carrier aggregation LTE-A system, to solve the prob(cid:173)
`lem offeeding back ACKINACK information corresponding
`to the data transmission of multiple downlink component
`carriers over the same uplink component carrier, it may be
`necessary to introduce a DAI command field and/or an ARI
`command field on the basis of the DCI in the LTE system.
`
`Samsung Exhibit 1001, Page 9
`
`

`

`US 8,885,587 B2
`
`3
`Therefore, an ACKINACK information feedback solution
`that is backward compatible with the LTE system needs to be
`provided.
`
`SUMMARY OF THE INVENTION
`
`Embodiments of the present invention provide a method, a
`base station, and a user equipment for feeding back ACKI
`NACK information for carrier aggregation, which realize the
`ACKINACK information feedback that is backward compat(cid:173)
`ible with an LTE system in carrier aggregation.
`An embodiment of the present invention provides a method
`for feeding back ACKINACK information for carrier aggre(cid:173)
`gation, including:
`configuring a common field preset in downlink control
`information, DCI, as at least one type of command field 15
`related to ACKINACK feedback, where the common field can
`be configured as the command fields related to ACKINACK
`feedback; and
`sending the DCI to a user equipment, so that the user
`equipment feeds back ACKINACK information according to
`the DCI.
`An embodiment of the present invention further provides a
`method for feeding back ACKINACK information for carrier
`aggregation, including:
`receiving downlink control information, DCI, which is sent 25
`by a base station and transmitted by a downlink component
`carrier; and
`feeding backACKINACK information according to a com(cid:173)
`mand field which is related to ACKINACK feedback and
`configured in a common field preset in the DCI, where the
`common field can be configured as at least two types of 30
`command fields related to ACKINACK feedback.
`An embodiment of the present invention provides a base
`station, including:
`a configuring module, configured to configure a common
`field preset in downlink control information, DCI, as at least 35
`one type of command field related to ACKINACK feedback,
`where the common field can be configured as the at least two
`types of command fields related to ACKINACK feedback;
`and
`a sending module, configured to send the DCI to a user
`equipment, so that the user equipment feeds back ACKI
`NACK information according to the DCI.
`An embodiment of the present invention provides a user
`equipment, including:
`a receiving module, configured to receive downlink control 45
`information, DCI, which is sent by a base station and trans(cid:173)
`mitted by a downlink component carrier; and
`a feedback module, configured to feed back ACKINACK
`information according to a command field which is related to
`ACKINACK feedback and configured in a common field
`preset in the DCI, where the common field can be configured
`as at least two types of command fields related to ACKINACK
`feedback.
`It can be known from the foregoing technical solutions that,
`in the embodiments of the present invention, a common field
`that can be configured as at least two types of command fields
`related to ACKINACK feedback is preset in the DCI, so the
`common field may be configured as different command fields
`so as to be different required command fields related to ACKI
`NACK feedback for LTE-A carrier aggregation, which real- 60
`izes the ACKINACK information feedback that is backward
`compatible with an LTE system in carrier aggregation.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`To explain the technical solutions in the embodiments of
`the present invention more clearly, accompanying drawings
`
`4
`required in the description of the embodiments are briefly
`introduced below. Apparently, the accompanying drawings to
`be described in the following are only some embodiments of
`the present invention. Those of ordinary skill in the art may
`5 also derive other drawings from these accompanying draw(cid:173)
`ings without creative efforts.
`FIG. 1 is a schematic flowchart of a method according to a
`first embodiment of the present invention;
`FIG. 2 is a schematic composition diagram of a system-
`10 linked downlink component carrier according to an embodi(cid:173)
`ment of the present invention;
`FIG.3 is a schematic diagram of adopted uplink and down(cid:173)
`link component carriers according to an embodiment of the
`present invention;
`FIG. 4 is a schematic flowchart of a method according to a
`second embodiment of the present invention;
`FIG. S is a schematic flowchart of a method according to a
`third embodiment of the present invention;
`FIG. Sa is a schematic flowchart of a method according to
`20 a third embodiment of the present invention;
`FIG. 6 is a schematic flowchart of a method according to a
`fourth embodiment of the present invention;
`FIG. 7 is a schematic flowchart of a method according to a
`fifth embodiment of the present invention;
`FIG. 8 is a schematic structural diagram of a base station
`according to a sixth embodiment of the present invention; and
`FIG. 9 is a schematic structural diagram of a user equip(cid:173)
`ment according to a seventh embodiment of the present inven(cid:173)
`tion.
`
`DETAILED DESCRIPTION OF THE
`EMBODIMENTS
`
`To make the purpose, technical solutions and benefits in the
`embodiments of the present invention clearer, the technical
`solutions in the embodiments of the present invention are
`described below in detail with reference to the accompanying
`drawing in the embodiments of the present invention. Appar(cid:173)
`ently, the described embodiments herein are only part of
`40 rather than all embodiments of the present invention. Based
`on the embodiments of the present invention, all other
`embodiments derived by those of ordinary skill in the art
`without creative efforts shall fall within the protection scope
`of the present invention.
`FIG. 1 is a schematic flowchart of a method according to a
`first embodiment of the present invention, including:
`Step 11: A base station configures a common field preset in
`DCI as at least one type of command field related to ACKI
`NACK feedback of at least two types of command fields
`50 related to ACKINACK feedback, where the common field can
`be configured as the command fields related to ACKINACK
`feedback.
`The at least two types of command fields related to ACKI
`NACK feedback include at least a DAI command field and/or
`55 an ARI command field. In addition, the at least two types of
`command fields related to ACKINACK feedback may further
`include a TPC command field or other command fields that
`the DCI may have, such as a carrier indication command field
`and a redundant version command field.
`In different scenarios, the common field may be configured
`as different command fields. The different scenarios may be
`different feedback modes. For example, when the feedback
`mode of the ACKINACK information is a bundling feedback
`mode, the common field is configured as the DAI command
`65 field; when the feedback mode of the ACKINACK informa(cid:173)
`tion is a multiplexing feedback mode, the common field is
`configured as theARI command field. The different scenarios
`
`Samsung Exhibit 1001, Page 10
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`US 8,885,587 B2
`
`10
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`5
`may also be different types of downlink component carriers.
`For example, the common field in the DCI transmitted over a
`system-linked downlink component carrier is configured as
`the TPC command field; and the common field in the DCI
`transmitted over a non-system-linked downlink component
`carrier is configured as the ARI command field and/or the
`DAI command field. For the specific definitions of the sys(cid:173)
`tem-linked downlink component carrier and non system(cid:173)
`linked downlink component carrier, reference may be made
`to the following description.
`Specifically, at one moment, the common field in the DCI
`transmitted over every downlink component carrier is respec(cid:173)
`tively configured as a specific command field. The common
`field transmitted by every downlink component carrier may
`be configured as a same command field; or the common field 15
`transmitted by the system-linked downlink component car(cid:173)
`rier and the common field transmitted by the non system(cid:173)
`linked downlink component carrier may be configured as
`different command fields respectively.
`Step 12: The base station sends the DCI to a user equip- 20
`ment, so that the user equipment feeds back ACKINACK
`information according to the DCI.
`Specifically, through the foregoing flexible configuration
`of the common field, the DCI may have different control
`command fields related to ACKINACK information feed- 25
`back. Therefore, the user equipment may parse the DCI to
`obtain the related control command field so as to realize the
`feedback of ACKINACK information for carrier aggregation.
`Further, before step 11, the method may include that: the
`base station sets the common filed in the DCI, which realizes
`the flexible configuration of the common field.
`In the embodiment of the present invention, a public field is
`set in the DCI and the public field may be configured as
`different command fields in different scenarios. Therefore,
`from the perspective of effectiveness, the common field is 35
`equivalent to the sum of command fields that the common
`field may be configured as, which realizes the representation
`of more command fields by using a smaller number of bits,
`and reduces bit overheads and the complexity of design and
`implementation. Therefore, the number of bits of the DCI 40
`information in an LTE-A system is kept consistent with that in
`an LTE system as much as possible, which realizes compat(cid:173)
`ibility with the LTE system, so that most design in the LTE
`system is passed down to the LTE-A system.
`In a carrier aggregation LTE-A system, it may be necessary 45
`to add an ARI command field; in an FDD system, an addi(cid:173)
`tional DAI command field may be required further. If the
`command fields are added independently, and in an example
`in which theARI command field and the DAI command field
`are both 2 bits long, 4 more bits are occupied by the DCI
`information in the FDD system. This is not good for the
`compatibility with the LTE system and what's more,
`increases the bit overheads and the complexity of design and
`implementation. For example, more bits occupied by the DCI
`information complicate the design of blind detection. There(cid:173)
`fore, in the embodiment of the present invention, a common
`field is set in the DCI. The command filed represented by the
`common field is not fixedly configured but may be configured
`as the DAI command field, or the ARI command field, or the
`TPC command field, or other command fields according to
`different scenarios. Therefore, one filed has the meanings of
`multiple command fields, which realized that the required
`multiple command fields are represented by fewer fields so
`that the bit overheads and the complexity of design and imple(cid:173)
`mentation is reduced.
`In a specific embodiment, the common field may be set in
`a marmer of adding bits in the DCI. For example, a 2-bit field
`
`6
`is added as the common field, and, according to different
`scenarios, the common field may be configured as the DAI
`command field or ARI command field. Compared with the
`conventional manner where the DAI command field and the
`ARI command field need to be added, the marmer in the
`embodiment of the present invention occupies fewer bits.
`That is, in the embodiment of the present invention, only 2
`bits need to be added, while 4 bits need to be added in the
`conventional mode.
`Although the manner of adding a new common field has
`advantages over the prior art, the manner of adding the new
`common field still adds to the bits of the DCI. For compat(cid:173)
`ibility with the prior art, a more preferable marmer is to make
`full use of the existing command fields in the DCI to set a
`common field without increasing the bits occupied by the
`DCI.
`To keep compatibility with the LTE system, the command
`fields in the DCI of the LTE system, such as the TPC com(cid:173)
`mand field, modulation and coding scheme command field,
`new data indication command field, and redundant version
`command field, are passed down to the DCI of the LTE-A
`system. In addition, to support some LTE-A specific fnnc(cid:173)
`tions, some special command fields are added for the LTE-A
`user equipment, for example, a carrier indication command
`field used to support cross-carrier scheduling of PDSCH
`transmission by a PDCCH.
`One or more of the foregoing LTE-A command fields may
`be used as the common field. For example, the DCI informa-
`30 tion of an LTE-A user equipment that supports cross-carrier
`scheduling of a PDSCH by a PDCCH includes a 3-bit carrier
`indication command field; when the number of aggregated
`carriers of the user equipment is small, the 3-bit carrier indi(cid:173)
`cation command field has some rednndant bits or redundant
`states. The 3 bits may be used as a common field, and the
`rednndant bits or redundant states may be used to transmit the
`carrier indication command field, and/or the ARI command
`field, and/or the DAI command field simultaneously. For
`another example, the redundant version command field is
`used to indicate the redundant version of the current PDSCH
`transmission in a physical layer HARQ process, and the 2 bits
`corresponding of the redundant version command field may
`be used as the common field. For an initial PDSCH transmis(cid:173)
`sion, the common field is used as the ARI command field and
`a preset default redundant version is used. For a PDSCH
`retransmission, the common field is used as the redundant
`version command field and the same uplinkACK channel as
`that for the initial transmission is assigned for the retransmis(cid:173)
`sion. However, no matter whether the common field is
`50 designed based on the existing carrier indication command
`field or redundant version command field, a great loss of
`scheduling flexibility is brought.
`During the implementation of the present invention, the
`inventor finds that, in the case of one user equipment, for a
`55 PDSCH transmitted over a downlink component carrier that
`are configured to feed backACKINACK information over the
`same uplink component carrier, the DCI that carries schedul(cid:173)
`ing information of the PDSCH has the same TPC command
`field at a same moment. This is because the TPC command
`60 fields are all used to control the transmission power of the
`uplink ACK charmel on a same uplink component carrier.
`Because the TPC command field included in each DCI is the
`same, the TPC command field is rednndant to the system, so
`the TPC command field may be fully utilized and configured
`65 as a common field. According to whether the common field is
`carried in the DCI of a system-linked downlink component
`carrier, the common field that replaces the original TPC com-
`
`S