1111111111111111 IIIIII IIIII 111111111111111 1111111111 1111111111 lllll 111111111111111 11111111
`US 20120257552Al
`
`c19) United States
`c12) Patent Application Publication
`Chen et al.
`
`c10) Pub. No.: US 2012/0257552 Al
`Oct. 11, 2012
`(43) Pub. Date:
`
`(54) TRANSMISSION OF CONTROL
`INFORMATION FOR FDD-TDD CARRIER
`AGGREGATION
`
`(75)
`
`Inventors:
`
`Wanshi Chen, San Diego, CA
`(US); Jelena M. Damnjanovic, Del
`Mar, CA(US)
`
`(73) Assignee:
`
`QUALCOMM
`INCORPORATED, San Diego,
`CA (US)
`
`(21) Appl. No.:
`
`13/443,387
`
`(22) Filed:
`
`Apr. 10, 2012
`
`Related U.S. Application Data
`
`(60) Provisional application No. 61/474,219, filed on Apr.
`11, 2011.
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`H04J 3/00
`(2006.01)
`H04W 72104
`(2009.01)
`H04J 1100
`(2006.01)
`(52) U.S. Cl. .......................... 370/280; 370/277; 370/281
`ABSTRACT
`(57)
`
`Techniques for transmitting control information to support
`communication on multiple component carriers (CCs) are
`disclosed. A user equipment (UE) may be configured for
`operation on multiple CCs. These CCs may be associated
`with control messages having different definitions. For
`example, a control message for a CC configured for fre(cid:173)
`quency division duplex (FDD) may have a different definition
`than a control message for a CC configured for time division
`duplex (TDD). A base station may send first control informa(cid:173)
`tion for a first CC based on a definition of a control message
`for a second CC, instead of a definition of a control message
`for the first CC. The control message for the second CC may
`be selected for use to send the first control information based
`on various designs.
`
`130
`
`Network
`Controller
`
`to/from
`Base
`Stations
`
`100
`~
`
`l 120r
`
`IPR2022-00626
`Apple EX1008 Page 1
`
`

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`
`130
`
`IPR2022-00626
`Apple EX1008 Page 2
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`

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`IPR2022-00626
`Apple EX1008 Page 3
`
`(cid:141)
`

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`IPR2022-00626
`Apple EX1008 Page 4
`
`(cid:141)
`

`

`Patent Application Publication
`
`Oct. 11, 2012 Sheet 4 of 13
`
`US 2012/0257552 Al
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`IPR2022-00626
`Apple EX1008 Page 5
`
`

`

`Patent Application Publication
`
`Oct. 11, 2012 Sheet 5 of 13
`
`US 2012/0257552 Al
`
`Single-Carrier Operation
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`IPR2022-00626
`Apple EX1008 Page 6
`
`

`

`Patent Application Publication
`
`Oct. 11, 2012 Sheet 6 of 13
`
`US 2012/0257552 Al
`
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`IPR2022-00626
`Apple EX1008 Page 7
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`

`

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`
`IPR2022-00626
`Apple EX1008 Page 8
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`

`

`Patent Application Publication
`
`Oct. 11, 2012 Sheet 8 of 13
`
`US 2012/0257552 Al
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`IPR2022-00626
`Apple EX1008 Page 9
`
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`Patent Application Publication
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`Oct. 11, 2012 Sheet 10 of 13
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`US 2012/0257552 Al
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`C
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`
`IPR2022-00626
`Apple EX1008 Page 11
`
`

`

`Patent Application Publication
`
`Oct. 11, 2012 Sheet 11 of 13
`
`US 2012/0257552 Al
`
`Start
`
`900
`r"
`
`912
`
`Determine first and second CCs
`configured for a UE, the first and
`second CCs being associated
`with first and second control
`messages, respectively,
`having different definitions
`
`914
`
`Send first control information
`for the first CC based on a
`definition of the second control
`message for the second CC
`
`1000
`r"
`
`Start
`
`1012
`Determine first and second CCs
`configured for a UE, the first and
`second CCs being associated
`with first and second control
`messages, respectively,
`having different definitions
`
`1014
`Receive first control information
`for the first CC sent based on a
`definition of the second control
`message for the second CC
`
`End
`
`FIG. 9
`
`End
`
`FIG. 10
`
`IPR2022-00626
`Apple EX1008 Page 12
`
`

`

`> ....
`
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`,,J
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`
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`CIF & Search
`
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`
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`
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`
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`
`1156
`
`,,J
`
`1158
`
`,,J
`
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`
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`
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`PDCCH/DCI
`
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`
`1154
`
`,,J
`
`1152
`UE
`
`,,J
`
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`
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`
`8
`
`1150
`
`1160
`
`,,J
`
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`
`Transmission
`POSCH/Data
`
`Module
`
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`PDCCH/DCI
`
`Module
`
`1114
`
`,,J
`
`1112
`
`,,J
`
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`
`,,J
`
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`
`110x
`
`FIG. 11
`
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`
`1132
`
`1170
`
`Scheduler
`
`Processor
`Controller/
`
`,,J
`1130
`
`Configuration
`Space Sharing
`CIF & Search
`
`Module
`
`1128
`
`,,J
`
`1124
`
`,,J
`
`,,J 8
`
`UCI Reception
`PUSCH/Data/
`
`Module
`
`1116
`
`1118
`
`Determination
`Definition/Size
`
`Module
`
`DCI
`,,J
`1126
`
`Configuration
`Multi-Carrier
`
`Module
`
`1122
`
`,,J
`
`Module
`Reception
`PUCCH/UCI
`
`1120
`
`,,J
`
`IPR2022-00626
`Apple EX1008 Page 13
`
`

`

`....
`0 ....
`....
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`1264
`
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`
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`Controller/
`
`1282
`
`Sink
`Data
`
`1260
`
`~
`
`120y
`
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`Receive
`
`Detector
`MIMO
`
`1258
`
`1256
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`
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`
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`
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`
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`
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`
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`
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`
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`
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`•
`•
`TXMIMO
`
`MOD
`----------
`DEMOD
`
`DEMOD
`----------
`
`Detector
`MIMO
`
`Processor
`Receive
`
`FIG. 12
`
`1252r
`
`•
`•
`•
`
`.. •
`
`1234t
`
`•
`•
`•
`
`1238
`
`Sink
`Data
`
`1239
`
`Scheduler
`
`Processor
`Controller/
`
`Memory
`
`1244
`
`1242
`
`IPR2022-00626
`Apple EX1008 Page 14
`
`

`

`US 2012/0257552 Al
`
`Oct. 11, 2012
`
`1
`
`TRANSMISSION OF CONTROL
`INFORMATION FOR FDD-TDD CARRIER
`AGGREGATION
`
`CLAIM OF PRIORITY UNDER 35 U.S.C. § 119
`
`[0001] The present application claims priority to provi(cid:173)
`sional U.S. Application Ser. No. 61/474,219, entitled
`"SEARCH SPACE DESIGN FOR FDD-TDD CARRIER
`AGGREGATION," filed Apr. 11, 2011, and incorporated
`herein by reference in its entirety.
`
`BACKGROUND
`
`[0002]
`I. Field
`[0003] The present disclosure relates generally to commu(cid:173)
`nication, and more specifically to techniques for transmitting
`control information in a wireless communication network.
`[0004]
`II. Background
`[0005] Wireless communication networks are widely
`deployed to provide various communication content such as
`voice, video, packet data, messaging, broadcast, etc. These
`wireless networks may be multiple-access networks capable
`of supporting multiple users by sharing the available network
`resources. Examples of such multiple-access networks
`include Code Division Multiple Access (CDMA) networks,
`Time Division Multiple Access (TDMA) networks, Fre(cid:173)
`quency Division Multiple Access
`(FDMA) networks,
`Orthogonal FDMA (OFDMA) networks, and Single-Carrier
`FDMA (SC-FDMA) networks.
`[0006] A wireless communication network may include a
`number of base stations that can support communication for a
`number of user equipments (UEs). AUE may communicate
`with a base station via the downlink and uplink. The downlink
`( or forward link) refers to the communication link from the
`base station to the UE, and the uplink ( or reverse link) refers
`to the communication link from the UE to the base station.
`[0007] A wireless communication network may support
`operation on multiple component carriers (CCs ). A CC may
`refer to a range of frequencies used for communication and
`may be associated with certain characteristics. For example, a
`CC may be associated with system information defining
`operation on the CC. A CC may also be referred to as a carrier,
`a frequency channel, a cell, etc. A base station may send data
`and downlink control information (DCI) on one or more CCs
`to a UE. The UE may send data and uplink control informa(cid:173)
`tion (UCI) on one or more CCs to the base station.
`
`SUMMARY
`
`[0008] Techniques for transmitting control information to
`support communication on multiple CCs are disclosed
`herein. A UE may be configured for operation on multiple
`CCs with carrier aggregation. The UE may be scheduled for
`data transmission on a given CC via a grant sent on the same
`CC without cross-carrier signaling or on another CC with
`cross-carrier signaling.
`[0009]
`In one design, a base station may determine first and
`second CCs configured for a UE for carrier aggregation. The
`first and second CCs may be associated with first and second
`control messages, respectively, having different definitions.
`For example, one CC may be configured for frequency divi(cid:173)
`sion duplex (FDD), and the other CC may be configured for
`time division duplex (TDD). A control message for the FDD
`CC may have a different definition than a control message for
`the TDD CC. The base station may send first control infor-
`
`mation for the first CC based on the definition of the second
`control message for the second CC, instead of the definition
`of the first control message for the first CC.
`[001 OJ The UE may be configured with a plurality of CCs
`including the first and second CCs. In one design, control
`information for the plurality of CCs may be sent on the second
`CC based on a predetermined message size or a largest mes(cid:173)
`sage size among a plurality of control messages associated
`with the plurality of CCs. In another design, a control mes(cid:173)
`sage for a CC having a smaller message size may include at
`least one additional control information field not included in
`a control message for a CC having a larger message size. In
`yet another design, a control message for a CC carrying a
`downlink control channel for the UE may be used to send
`control information for the plurality of CCs. In yet another
`design, a control message for a CC carrying an uplink control
`channel for the UE may be used to send control information
`for the plurality of CCs. The various designs for sending
`control information for the plurality of CCs are described in
`detail below.
`[0011] Various aspects and features of the disclosure are
`described in further detail below.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 shows a wireless communication network.
`FIG. 2A shows an exemplary frame structure for
`
`[0012]
`[0013]
`FDD.
`[0014]
`TDD.
`[0015]
`CCs.
`[0016] FIG. 3B shows carrier aggregation with non-con(cid:173)
`tiguous CCs.
`[0017] FIG. 4A shows single-carrier operation.
`[0018] FIG. 4B shows carrier aggregation without cross(cid:173)
`carrier signaling.
`[0019] FIG. 4C shows carrier aggregation with cross-car(cid:173)
`rier signaling.
`[0020] FIG. 5 shows an example of multiple VE-specific
`search spaces for a CC with cross-carrier signaling.
`[0021] FIG. 6 shows an example of search space sharing.
`[0022] FIG. 7 shows anexampleofthreeCCs with different
`configurations.
`[0023] FIG. 8 shows an example of cross-carrier signaling
`for two CCs.
`[0024] FIG. 9 shows a process for transmitting control
`information.
`[0025] FIG. 10 shows a process for receiving control infor-
`mation.
`[0026] FIG. 11 shows a block diagram of a base station and
`aUE.
`[0027] FIG. 12 shows another block diagram of a base
`station and a UE.
`
`FIG. 2B shows an exemplary frame structure for
`
`FIG. 3A shows carrier aggregation with contiguous
`
`DETAILED DESCRIPTION
`
`[0028] The techniques described herein may be used for
`various wireless communication networks such as CDMA,
`TDMA, FDMA, OFDMA, SC-FDMA and other wireless
`networks. The terms "network" and "system" are often used
`interchangeably. A CDMA network may implement a radio
`technology such as Universal Terrestrial Radio Access
`(UTRA), cdma2000, etc. UTRA includes Wideband CDMA
`(WCDMA), Time Division Synchronous CDMA (TD-
`
`IPR2022-00626
`Apple EX1008 Page 15
`
`

`

`US 2012/0257552 Al
`
`Oct. 11, 2012
`
`2
`
`SCDMA), and other variants of CDMA. cdma2000 covers
`IS-2000, IS-95 and IS-856 standards. A TDMA network may
`implement a radio technology such as Global System for
`Mobile Communications (GSM). An OFDMA network may
`implement a radio technology such as Evolved UTRA
`(E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11
`(Wi-Fi and Wi-Fi Direct), IEEE 802.16 (WiMAX), IEEE
`802.20, Flash-OFDM®, etc. UTRA and E-UTRA are part of
`Universal Mobile Telecommunication System (UMTS).
`3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE(cid:173)
`A), in both FDD and TDD, are new releases ofUMTS that use
`E-UTRA, which employs OFDMA on the downlink and SC(cid:173)
`FDMA on the uplink. UTRA, E-UTRA, UMTS, LTE, LTE-A
`and GSM are described in documents from an organization
`named "3rd Generation Partnership Project" (3GPP).
`cdma2000 and UMB are described in documents from an
`organization named "3rd Generation Partnership Project 2"
`(3GPP2). The techniques described herein may be used for
`the wireless networks and radio technologies mentioned
`above as well as other wireless networks and radio technolo(cid:173)
`gies. For clarity, certain aspects of the techniques are
`described below for LTE/LTE-A, and LTE/LTE-A terminol(cid:173)
`ogy is used in much of the description below.
`[0029] FIG. 1 shows a wireless communication network
`100, which may be an LTE network or some other wireless
`network. Wireless network 100 may include a number of
`evolved Node Bs (eNBs) 110 and other network entities. An
`eNB may be a station that communicates with the UEs and
`may also be referred to as a base station, a Node B, an access
`point, etc. Each eNB 110 may provide communication cov(cid:173)
`erage for a particular geographic area. In 3GPP, the term
`"cell" can refer to a coverage area of an eNB and/or an eNB
`subsystem serving this coverage area, depending on the con(cid:173)
`text in which the term is used.
`[0030] An eNB may provide communication coverage for a
`macro cell, a pico cell, a femto cell, and/or other types of cell.
`A macro cell may cover a relatively large geographic area
`(e.g., several kilometers in radius) and may allow unrestricted
`access by UEs with service subscription. A pico cell may
`cover a relatively small geographic area and may allow unre(cid:173)
`stricted access by UEs with service subscription. A fem to cell
`may cover a relatively small geographic area ( e.g., a home)
`and may allow restricted access by UEs having association
`with the femto cell (e.g., UEs in a Closed Subscriber Group
`(CSG)). In the example shown in FIG. 1, eNBs 110a, 110b
`and 110c maybe macro eNBs for macro cells 102a, 102band
`102c, respectively. eNB 110d may be a pico eNB for a pico
`cell 102d. eNBs ll0e and 110/ may be fem to eNBs for femto
`cells 102e and 102/, respectively. An eNB may support one or
`multiple (e.g., three) cells.
`[0031] Wireless network 100 may also include relays. In
`the example shown in FIG. 1, a relay llOr may communicate
`with eNB 110a and a UE 120r in order to facilitate commu(cid:173)
`nication between eNB 110a and UE 120r.
`[0032] A network controller 130 may couple to a set of
`eNBs and provide coordination and control for these eNBs.
`Network controller 130 may communicate with the eNBs via
`a backhaul. The eNBs may also communicate with one
`another, e.g., directly or indirectly via wireless or wireline
`backhaul.
`[0033] UEs 120 (e.g., 120d, 120e, etc.) may be dispersed
`throughout wireless network 100, and each UE may be sta(cid:173)
`tionary or mobile. AUE may also be referred to as a terminal,
`a mobile station, a subscriber unit, a station, etc.A UEmaybe
`
`a cellular phone, a smartphone, a tablet, a personal digital
`assistant (PDA), a wireless modem, a netbook, a smartbook,
`a wireless communication device, a handheld device, a laptop
`computer, a cordless phone, a wireless local loop (WLL)
`station, etc. AUE may be able to communicate with macro
`eNBs, pico eNBs, femto eNBs, relays, etc.
`[0034] Wireless network 100 may support data transmis(cid:173)
`sion with hybrid automatic repeat request (HARQ) in order to
`improve reliability. For HARQ, a transmitter (e.g., an eNB)
`may send an initial transmission of a packet and may send one
`or more additional transmissions of the packet, if needed,
`until the packet is decoded correctly by a receiver ( e.g., a UE),
`or the maximum number of transmissions of the packet has
`occurred, or some other termination condition is encountered.
`After each transmission of the packet, the receiver may send
`an acknowledgement (ACK) if the packet is decoded cor(cid:173)
`rectly or a negative acknowledgement (NACK) if the packet
`is decoded in error. The transmitter may send another trans(cid:173)
`mission of the packet if a NACK is received and may termi(cid:173)
`nate transmission of the packet if an ACK is received. A
`packet may also be referred to as a transport block, a code(cid:173)
`word, a data block, etc.
`[0035] Wirelessnetworkl00mayutilizeFDDand/orTDD.
`For FDD, the downlink and uplink may be allocated separate
`frequency channels, and downlink transmissions and uplink
`transmissions may be sent concurrently on the two frequency
`channels. For TDD, the downlink and uplink may share the
`same frequency channel, and downlink and uplink transmis(cid:173)
`sions may be sent on the same frequency channel in different
`time periods.
`[0036] FIG. 2A shows an exemplary frame structure 200
`for FDD in LTE. The transmission timeline for each of the
`downlink and uplink may be partitioned into units of radio
`frames. Each radio frame may have a predetermined duration
`(e.g., 10 milliseconds (ms)) and may be partitioned into 10
`subframes with indices of0 through 9. Each subframe may
`include two slots. Each radio frame may thus include 20 slots
`with indices ofO through 19. Each slot may include L symbol
`periods, e.g., seven symbol periods for a normal cyclic prefix
`(as shown in FIG. 2A) or six symbol periods for an extended
`cyclic prefix. The 2L symbol periods in each subframe may be
`assigned indices of 0 through 2L-1.
`[0037] FIG. 2B shows an exemplary frame structure 250 for
`TDD in LTE. The transmission timeline for the downlink and
`uplink may be partitioned into units of radio frames, and each
`radio frame may be partitioned into 10 subframes with indi(cid:173)
`ces of 0 through 9. LTE supports a number of uplink-down(cid:173)
`link configurations for TDD. Each uplink-downlink configu(cid:173)
`ration indicates whether each subframe is a downlink
`subframe, an uplink subframe, or a special subframe. Sub(cid:173)
`frames O and 5 are used for the downlink and subframe 2 is
`used for the uplink for all uplink-downlink configurations.
`Subframes 3, 4, 7, 8 and 9 may each be used for the downlink
`or uplink depending on the uplink-downlink configuration.
`Subframe 1 includes a Downlink Pilot Time Slot (DwPTS), a
`Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS).
`Subframe 6 may include only the DwPTS, or all three special
`fields, or a downlink subframe depending on the uplink(cid:173)
`downlink configuration.
`[0038] For both FDD and TDD, a subframe for the down(cid:173)
`link may be referred to as a downlink subframe. A subframe
`for the uplink may be referred to as an uplink subframe. A CC
`configured for FDD may be referred to as an FDD CC. A CC
`configured for TDD may be referred to as a TDD CC.
`
`IPR2022-00626
`Apple EX1008 Page 16
`
`

`

`US 2012/0257552 Al
`
`Oct. 11, 2012
`
`3
`
`[0039] For both FDD and TDD, a cell may transmit a Physi(cid:173)
`cal Downlink Control Channel (PDCCH), a Physical HARQ
`Indicator Channel (PRICH), and/or other physical channels
`in a control region of a downlink subframe. The PDCCH may
`carry downlink control information (DCI) such as downlink
`grants, uplink grants, etc. The PRICH may carry ACK/NACK
`feedback for data transmission sent on the uplink with
`HARQ. The cell may also transmit a Physical Downlink
`Shared Channel (PD SCH) and/ or other physical channels in a
`data region of a downlink subframe. The PDSCH may carry
`data for UEs scheduled for data transmission on the down(cid:173)
`link. A UE may transmit either a Physical Uplink Control
`Channel (PUCCH) in a control region of an uplink subframe
`or a Physical Uplink Shared Channel (PUSCH) in a data
`region of the uplink subframe. The PUCCH may carry uplink
`control information (UCI) such as channel state information
`(CSI), ACK/NACK, scheduling request, etc. The PUSCH
`may carry data and/or UCL The various signals and channels
`in LTE are described in 3GPP TS 36.211, entitled "Evolved
`Universal Terrestrial Radio Access (E-UTRA); Physical
`Channels and Modulation," which is publicly available.
`[0040] Wireless network 100 may support operation with
`multiple CCs, which may be referred to as carrier aggregation
`or multi-carrier operation. A UE may be configured with
`multiple CCs for the downlink and one or more CCs for the
`uplink for carrier aggregation. A CC for the downlink may be
`referred to as a downlink CC. A CC for the uplink may be
`referred to as an uplink CC. An eNB may send data and DCI
`on one or more CCs to the UE. The UE may send data and UCI
`on one or more CCs to the eNB.
`[0041] FIG. 3A shows an example of continuous carrier
`aggregation. K CCs may be available for communication and
`may be adjacent to each other, where K may be any integer
`value.
`[0042] FIG. 3B shows an example of non-continuous car(cid:173)
`rier aggregation. K CCs may be available for communication
`and may be separate from each other.
`[0043]
`In LTE Release 10, for example, a UE may be con(cid:173)
`figured with up to five CCs for carrier aggregation. Each CC
`may have a bandwidth of up to 20 MHz and may be backward
`compatible with LTE Release 8. The UE may thus be config(cid:173)
`ured with up to 100 MHz for up to five CCs. One CC may be
`designated as a primary CC (PCC), and the remaining CCs
`may be referred to as secondary CCs (SCCs ). An eNB may
`transmit the PDCCH on the PCC, and the UE may transmit
`the PUCCH on the PCC. Two or more CCs may also be
`configured as PCCs so that UCI can be sent on the PUCCH on
`two or more CCs.
`[0044] FIG. 4A shows an example of single-carrier opera(cid:173)
`tion. A UE may operate on a single CC for communication
`with an eNB. The eNB may send a downlink (DL) grant
`and/or an uplink (UL) grant for the UE on the PDCCH in the
`control region of a downlink subframe. The downlink grant
`may comprise various parameters for data transmission from
`the eNB to the UE. The uplink grant may comprise various
`parameters for data transmission from the UE to the eNB. The
`eNB may send data transmission to the UE on the PDSCH in
`the data region of the downlink subframe. The UE may send
`data transmission to the eNB on the PUSCH in the data region
`of an uplink subframe.
`[0045] FIG. 4B shows an example of carrier aggregation
`without cross-carrier signaling. AUE may be configured with
`multiple CCs for carrier aggregation. Each CC for the down(cid:173)
`link may be paired or associated with one CC for the uplink,
`
`e.g., via higher layer configuration. A pair of downlink CC
`and uplink CC may be referred to as a cell. Control informa(cid:173)
`tion (e.g., grants) may be sent on a downlink CC to support
`data transmission on the downlink CC and the paired uplink
`CC.
`[0046] FIG. 4C shows an example of carrier aggregation
`with cross-carrier signaling. Cross-carrier signaling refers to
`sending control information on one CC to support data trans(cid:173)
`mission on another CC. For example, a downlink grant may
`be sent on one CC to schedule data transmission on another
`CC.
`[0047] LTE supports a number ofDCI formats that may be
`used to send DCI on the downlink. Table 1 lists a set of DCI
`formats supported by LTE. DCI format O may be used to send
`uplink grants for data transmission on the uplink. DCI for(cid:173)
`mats 1, IA, 1B, IC and ID may be used to send downlink
`grants for transmission of one codeword/packet on the down(cid:173)
`link. DCI formats 2, 2A and 2B may be used to send downlink
`grants for transmission of two codewords on the downlink for
`multiple-input multiple output (MIMO). DCI formats 3 and
`3A may be used to send transmit power control (TPC) infor(cid:173)
`mation to UEs. DCI formats 0, IA, 3 and 3A have the same
`size. DCI formats 1, 18, IC, ID, 2, 2A and 2B may have
`different sizes.
`
`TABLE 1
`
`DCI Formats
`
`DCI Format Description
`
`0
`
`!A
`
`lB
`
`lC
`
`lD
`
`2
`
`2A
`
`2B
`
`3
`
`3A
`
`Used for scheduling uplink transmission on the PUSCH.
`Used for scheduling transmission of one codeword on the
`PDSCH.
`Used for compact scheduling of one codeword on the
`PDSCH and for random access procedure.
`Used for compact scheduling of one codeword on the
`PDSCH with precoding information.
`Used for very compact scheduling of one codeword on the
`PDSCH.
`Used for compact scheduling of one codeword on the
`PDSCH with precoding and power offset information.
`Used for scheduling two codewords on the PDSCH with
`closed-loop spatial multiplexing with cell-specific reference
`signal (CRS).
`Used for scheduling two codewords on the PDSCH with
`open-loop spatial multiplexing with CRS.
`Used for scheduling two codewords on the PDSCH with
`spatial multiplexing with precoded DE-specific reference
`signal.
`Used for transmission ofTPC commands for the PUCCH
`and PUSCH with 2-bit power adjustruents.
`Used for transmission ofTPC commands for the PUCCH
`and PUSCH with 1-bit power adjustruents.
`
`[0048] Table I lists a set ofDCI formats supported by LTE
`Release 9, for example. Other DCI formats may also be
`supported, e.g., DCI format 2C in LTE