1111111111111111 IIIIII IIIII 1111111111 1111111111 111111111111111 1111111111 1111111111 11111111
`US 20100098012Al
`
`(19) United States
`02) Patent Application Publication
`Bala et al.
`
`(10) Pub. No.: US 2010/0098012 Al
`Apr. 22, 2010
`(43) Pub. Date:
`
`(54) UPLINK CONTROL INFORMATION
`TRANSMISSION METHODS FOR CARRIER
`AGGREGATION
`
`(22) Filed:
`
`Oct. 20, 2009
`
`Related U.S. Application Data
`
`(75)
`
`Inventors:
`
`Erdem Bala, Farmingdale, NY
`(US); Philip J. Pietraski,
`Huntington Station, NY (US);
`Sung-Hyuk Shiu, Northvale, NJ
`(US); Guodong Zhang, Syosset,
`NY (US); Allan Y. Tsai, Boonton,
`NJ (US); Joseph S. Levy, Merrick,
`NY (US); Pascal M. Adjakple,
`Great Neck, NY (US); John W.
`Halm, Baldwin, NY (US); Robert
`L. Olesen, Huntington, NY (US);
`Kyle Jung-Lin Pan, Smithtown,
`NY(US)
`
`Correspondence Address:
`VOLPE AND KOENIG, P.C.
`DEPT. ICC
`UNITED PLAZA, SUITE 1600, 30 SOUTH 17TH
`STREET
`PHILADELPHIA, PA 19103 (US)
`
`(73) Assignee:
`
`INTERDIGITAL PATENT
`HOLDINGS, INC., Wilmington,
`DE(US)
`
`(21) Appl. No.:
`
`12/582,462
`
`PUCCH~
`
`(60) Provisional application No. 61/106,847, filed on Oct.
`20, 2008, provisional application No. 61 /115,351,
`filed on Nov. 17, 2008, provisional application No.
`61/172,127, filed on Apr. 23, 2009, provisional appli(cid:173)
`cation No. 61/218,782, filed on Jun. 19, 2009.
`
`Publication Classification
`
`(51)
`
`Int.Cl.
`H04W 72104
`(52) U.S. Cl. ........... .....
`
`(2009.0 1)
`. ................ 370/329
`
`(57)
`
`ABSTRACT
`
`A method and apparatus for transmitting uplink control infor(cid:173)
`mation (UC!) for Long Term Evolution-Advanced (LTE-A)
`using carrier aggregation is disclosed. Methods for UC] trans(cid:173)
`mission in the uplink control channel, uplink shared channel
`or uplink data channel are disclosed. The methods include
`transmitting channel quality indicators (CQJ), precoding
`matrix indicators (Pfvil), rank indicators (Rl), hybrid auto(cid:173)
`matic repeat request (HARQ) acknowledgement/non-ac(cid:173)
`knowledgement (ACK/NACK), channel status reports (CQI/
`PW/Rl), source routing (SR) and sounding reference signals
`(SRS). ln addition, methods for providing flexible configura(cid:173)
`tion in signaling UCJ, efficient resource utilization, and sup(cid:173)
`port for high vohune UC! overhead in LTE-A are disclosed.
`
`,
`/
`
`UCI reporting for non(cid:173)
`anchor cell(s)
`
`UCI reporting for non(cid:173)
`anchor cell(s)
`
`14-- - - - - -- ---11.5 rnsec sloti- - --
`
`- - - - --+1
`
`Samsung Ex. 1014
`
`

`

`Patent Application Publication Apr. 22, 2010 Sheet 1 of 7
`
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`Samsung Ex. 1014
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`

`

`Patent Application Publication Apr. 22, 2010 Sheet 3 of 7
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`US 2010/0098012 Al
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`Samsung Ex. 1014
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`

`

`Patent Application Publication Apr. 22, 2010 Sheet 4 of 7
`
`US 2010/0098012 Al
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`II
`[2]
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`
`Samsung Ex. 1014
`
`

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`ACK/NACK for Carrler-1
`(1 / 2 bits)
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`(1 /2 b its)
`.
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`
`Samsung Ex. 1014
`
`

`

`Patent Application Publication Apr. 22, 2010 Sheet 6 of 7
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`PatentApplicatioo Publication
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`Apr. 22, 2010 Sheet 7 of 7
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`US 2010/0098012 Al
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`

`

`US 2010/0098012 Al
`
`Apr. 22, 2010
`
`1
`
`UPLINK CONTROL INFORMATION
`TRANSMISSION METHODS FOR CARRIER
`AGGREGATION
`
`CROSS REFERENCE TO RELATED
`APPLICATIONS
`
`[0001] This application claims the benefit of U.S. provi(cid:173)
`sional application Nos. 61/106,847 filed Oct. 20, 2008;
`61/115,351 filed Nov. 17, 2008; 61/172,127 filed Apr. 23,
`2009; and 61/218,782 filed Jun. 19, 2009, all of which are
`incorporated by reference as if fully set forth.
`
`FIELD OF INVENTION
`
`[0002] This application is related to wireless communica(cid:173)
`tions.
`
`BACKGROUND
`
`[0003] Long Term Evolution (LTE) supports data rates up
`to 100 Mbps in the downlink and 50 Mbps in the uplink.
`LTE-Advanced (LTE-A) provides a fivefold improvement in
`downlink data rates relative to LTE using, among other tech(cid:173)
`niques, carrier aggregation. Carrier aggregation may support,
`for example, flexible bandwidth assignments up to 100 MHz.
`Carriers are known as component carriers in LTE-A.
`[0004] LTE-A may operate in symmetric and asymmetric
`configurations with respect to component carrier size and the
`number of component carriers. This is supported through the
`use or aggregation ofup to five 20 MHz component carriers.
`For example, a single contiguous downlink (DL) 40 MHz
`LTE-A aggregation of multiple component carriers may be
`paired with a single 15 MHz uplink (UL) carrier. Non-con(cid:173)
`tiguous LTE-A DL aggregate carrier assignments may there(cid:173)
`fore not correspond with the UL aggregate carrier assign(cid:173)
`ment.
`[0005] Aggregate carrier bandwidth may be contiguous
`where multiple adjacent component carriers may occupy con(cid:173)
`tinuous 10, 40 or 60 MHz. Aggregate carrier bandwidth may
`also be non-contiguous where one aggregate carrier may be
`built from more than one, but not necessarily adjacent com(cid:173)
`ponent carriers. For example, a first DL component carrier of
`15 MHz may be aggregated with a second non-adjacent DL
`component carrier of 10 MHz, yielding an overall 25 MHz
`aggregate bandwidth for LTE-A. Moreover, component car(cid:173)
`riers may be situated at varying pairing distances. For
`example, the 15 and 10 MHz component carriers may be
`separated by 30 MHz, or in another setting, by only 20 MHz.
`As such, the number, size and continuity of component car(cid:173)
`riers may be different in the UL and DL.
`[0006] As more than one component carrier may be used to
`support larger transmission bandwidths in LTE-A, a wireless
`transmit/receive unit (WTRU) may be required to feedback
`uplink control information (UCI) such as for example, chan(cid:173)
`nel quality indicators (CQI), precoding matrix indicators
`(PMI), rank indicators (RI), hybrid automatic repeat request
`(HARQ), acknowledgement/non-acknowledgement (ACK/
`NACK), channel status reports (CQI/PMI/RI), and source
`routing (SR) associated with downlink transmission for sev(cid:173)
`eral component carriers. This means that the number of bits
`for UCI is increased compared to LTE. In addition, for uplink
`transmissions, the Peak to Average Power Ratio (PAPR) or
`Cubic Metric (CM) property needs to be considered. A large
`PAPR would cause the WTRU to back-off the power which
`would result in performance degradation. Accordingly,
`
`physical uplink control channel (PUCCH) transmissions
`need to have a low PAPR or CM.
`[0007]
`In LTE-A, it is anticipated that the UCI overhead
`may be increased, compared to LTE, taking into account the
`new features including coordinated multipoint transmission
`(CoMP), higher order DL multiple-input multiple-output
`(MIMO), bandwidth extension, and relay. For example, in
`order to support high order MIMO (8x8 MIMO) and/or
`CoMP, a large amount of channel status reports (CQI/PMI/
`RI) are fed back to the serving base station and possibly
`neighboring base stations as well in Co MP. The UCI overhead
`will be further increased in asymmetric bandwidth extension.
`Accordingly, the payload size of Release 8 LTE PUCCH may
`not be sufficient to carry the increased UCI overhead even for
`a single DL component carrier in LTE-A. Therefore new
`methods are needed to carry UCI in a LTE-A carrier aggre(cid:173)
`gation system.
`
`SUMMARY
`
`[0008] A method and apparatus for transmitting uplink
`control information (UCI) for Long Term Evolution-Ad(cid:173)
`vanced (LTE-A) using carrier aggregation is disclosed. Meth(cid:173)
`ods for UCI transmission in the uplink control channel, uplink
`shared channel or uplink data channel are disclosed. The
`methods include transmitting channel quality indicators
`(CQI), precoding matrix indicators (PMI), rank indicators
`(RI), hybrid automatic repeat request (HARQ) acknowledge(cid:173)
`ment/non-acknowledgement (ACK/NACK), channel status
`reports (CQI/PMI/RI), source routing (SR) and sounding ref(cid:173)
`erence signals (SRS). In addition, methods for providing
`flexible configuration in signaling UCI, efficient resource
`utilization, and support for high volume UCI overhead in
`LTE-A is disclosed.
`[0009] Methods are also disclosed for using, configuring
`and multiplexing of a periodic uplink data channel to handle
`high volume variable size wireless transmit/receive unit
`(WTRU) feedback due to bandwidth extension in cases of
`multi-carriers, higher order multiple-input multiple-output
`(MIMO), coordinated multi-point transmission and reception
`(CoMP), frequency selectivity, and other scenarios where
`WTRU feedback information is large and may not use con(cid:173)
`ventional periodic uplink control channels. The periodic
`uplink data channels carry high volume variable size WTRU
`feedback information, such as precoding matrix indicator
`(PMI), rank indication (RI), channel quality indicator (CQI),
`Acknowledge/Not Acknowledge (ACK/NACK), channel
`state information (CSI) etc. Configuration of periodic uplink
`data channel, reporting mode, reporting format, is also pro(cid:173)
`vided. Procedures to handle collisions between hybrid auto(cid:173)
`matic repeat request (HARQ)-ACK and SR with multiplex
`periodic uplink data channel ( control) and other uplink data
`channel (data) in the same subframe are disclosed.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[001 OJ A more detailed understanding may be had from the
`following description, given by way of example in conjunc(cid:173)
`tion with the accompanying drawings wherein:
`[0011] FIG. 1 is an embodiment of a wireless communica(cid:173)
`tion system/access network oflong term evolution (LTE);
`[0012] FIG. 2 are example block diagrams of a wireless
`transmit/receive unit (WTRU) and a base station of an LTE
`wireless communication system;
`[0013] FIG. 3 shows example resource block allocations;
`
`Samsung Ex. 1014
`
`

`

`US 2010/0098012 Al
`
`Apr. 22, 2010
`
`2
`
`[0014] FIG. 4 shows an example of frequency multiplexing
`of control data;
`[0015] FIG. 5 shows an example of code division multi(cid:173)
`plexing based acknowledgement/non-acknowledgement
`transmission in asymmetric carrier aggregation;
`[ 0016] FIG. 6 shows an example of frequency division mul(cid:173)
`tiplexing based on uplink control information (UCI) trans(cid:173)
`mission using multiple physical uplink channel (PUCCH)
`resource blocks; and
`[0017] FIG. 7 shows an example of transmitting high vol(cid:173)
`ume UCI on both the PUCCH and physical uplink shared
`channel (PUSCH) from a WTRU in downlink coordinated
`multi-point transmission and reception.
`
`DETAILED DESCRIPTION
`
`[0018] When referred to hereafter, the terminology "wire(cid:173)
`less transmit/receive unit (WTRU)" includes but is not lim(cid:173)
`ited to a user equipment (UE), a mobile station, a fixed or
`mobile subscriber unit, a pager, a cellular telephone, a per(cid:173)
`sonal digital assistant (PDA), a computer, or any other type of
`user device capable of operating in a wireless environment.
`When referred to hereafter, the terminology "base station"
`includes but is not limited to a Node-B, a site controller, an
`access point (AP), or any other type of interfacing device
`capable of operating in a wireless environment.
`[0019] FIG.1 shows a Long Term Evolution (LTE) wireless
`communication system/access network 100 that includes an
`Evolved-Universal Terrestrial Radio Access Network (E-UT(cid:173)
`RAN) 105. The E-UTRAN 105 includes a WTRU 110 and
`several base stations, such as evolved Node-Bs, (eNBs) 120.
`The WTRU 110 is in communication with an eNB 120. The
`eNBs 120 interface with each other using an X2 interface.
`Each of the eNBs 120 interface with a Mobility Management
`Entity (MME)/Serving Gate Way (S-GW) 130 through an Sl
`interface. Although a single WTRU 110 and three eNBs 120
`are shown in FIG. 1, it should be apparent that any combina(cid:173)
`tion of wireless and wired devices may be included in the
`wireless communication system access network 100.
`[0020] FIG. 2 is an exemplary block diagram of an LTE
`wireless communication system 200 including the WTRU
`110, the eNB 120, and the MME/S-GW 130. As shown in
`FIG. 2, the WTRU 110, the eNB 120 and the MME/S-GW
`130 are configured to perform uplink control information
`transmission methods for carrier aggregation.
`[0021]
`In addition to the components that may be found in
`a typical WTRU, the WTRU 110 includes a processor 216
`with an optional linked memory 222, at least one transceiver
`214, an optional battery 220, and an antenna 218. The pro(cid:173)
`cessor 216 is configured to perform uplink control informa(cid:173)
`tion transmission methods for carrier aggregation. The trans(cid:173)
`ceiver 214 is in communication with the processor 216 and
`the antenna 218 to facilitate the transmission and reception of
`wireless communications. In case the optional battery 220 is
`used in the WTRU 110, it powers the transceiver 214 and the
`processor 216.
`[0022]
`In addition to the components that may be found in
`a typical eNB, the eNB 120 includes a processor 217 with an
`optional linked memory 215, transceivers 219, and antennas
`221. The processor 217 is configured to perform uplink con(cid:173)
`trol information transmission methods for carrier aggrega(cid:173)
`tion. The transceivers 219 are in communication with the
`processor 217 and antennas 221 to facilitate the transmission
`and reception of wireless communications. The eNB 120 is
`connected to the Mobility Management Entity/Serving Gate-
`
`Way (MME/S-GW) 130 which includes a processor 233 with
`an optional linked memory 234.
`[0023] Methods for transmitting uplink control informa(cid:173)
`tion (UCI) for Long Term Evolution-Advanced (LTE-A)
`using carrier aggregation are disclosed. An example method
`using an uplink control channel such as a physical uplink
`control channel (PUCCH) is disclosed. UCI may include
`channel quality indicators (CQI), precoding matrix indicators
`(PMI), rank indicators (RI), hybrid automatic repeat request
`(HARQ), acknowledgement (ACK/NACK), channel status
`reports (CQI/PMI/RI), source routing (SR) and sounding ref(cid:173)
`erence signals (SRS).
`[0024] Methods are also disclosed for providing flexible
`configuration in signaling UCI, efficient resource utilization,
`and support for high volume UCI overhead in LTE-A with
`respect to the PUCCH.
`[0025]
`In an embodiment for mapping ofCQI, PMI and RI
`to physical resource elements in carrier aggregation, the
`PUCCH that carries the CQI (and any other possible control
`information such as scheduling request, ACK/NACK, etc.) is
`transmitted on one uplink component carrier. This WTRU(cid:173)
`specific uplink component carrier which carries the PUCCH
`may be configured by the eNodeB and signaled to the WTRU
`with higher layer signaling, for example RRC signaling.
`Alternatively, this uplink component carrier may be signaled
`by the eNodeB with L1 signaling. Alternatively, this uplink
`component carrier may be predetermined by an implicit map(cid:173)
`ping rule. Alternatively, this uplink component carrier may be
`selected by the WTRU.
`[0026]
`In an example method for transmission over one
`uplink component carrier, the mapping of control data or
`control information to physical resource elements in carrier
`aggregation may comprise joint coding of the control data for
`downlink (DL) component carriers. For example, the CQI
`corresponding to several downlink component carriers may
`be jointly coded. The terms control data and control informa(cid:173)
`tion are used interchangeably throughout.
`[0027] The control data bits may be modulated and then
`each modulated symbol may be spread with a sequence, for
`example, a constant amplitude zero autocorrelation
`(CAZAC) sequence like a Zadoff-Chu sequence. The length
`of the spreading sequence, denoted by N, may be equal to the
`length of the subcarriers allocated for PUCCH transmission.
`In LTE, N= 12 corresponds to the number of subcarriers in one
`resource block. PUCCHs of different WTRUs may use the
`spreading sequence with different cyclic shifts to maintain the
`orthogonality between them. The spread symbols may be
`mapped to the allocated subcarriers in an inverse fast Fourier
`transform (IFFT) block and transmitted after the IFFT is
`performed. For LTE-A, N may be larger than twelve. With a
`larger N, (i.e., a spreading sequence with longer length), a
`WTRU may use several different cyclic shifts of the spreading
`sequence to transmit more than one modulated data symbol
`per Single Carrier Frequency Division Multiple Access (SC(cid:173)
`FDMA) or Orthogonal frequency-division multiplexing
`(OFDM) symbol.
`[0028] The number of downlink carriers for each WTRU
`may be different, resulting in N being different. The code
`orthogonality may not be maintained if the same set of
`resource blocks (RBs) are used for all WTRUs each having
`different N. In this case, different sets of RBs may be allo(cid:173)
`cated for different sequence lengths. As an example, if there
`are sequence lengths of12k where k=l, 2, ... 5, then five sets
`of RBs may be required. In this case, the Peak to Average
`
`Samsung Ex. 1014
`
`

`

`US 2010/0098012 Al
`
`Apr. 22, 2010
`
`3
`
`Power Ratio (PAPR) is also not increased. If a WTRU uses
`orthogonal sequences over the same RBs to transmit different
`modulation symbols, the PAPR may be increased after the
`IFFT.
`In another method, the length of the spreading
`[0029]
`sequence may be the same for all WTRU s, for example N= 12,
`as in LTE Release 8. Then, a WTRU may be configured to use
`more RBs to transmit more modulated symbols. For example,
`five RBs may be used to transmit five modulated symbols per
`SC-FD MA or OFDM symbol. The same or different spread(cid:173)
`ing sequences may be used on these RBs.
`[0030] For example, in FIG. 3, each RB may carry one
`modulated symbol with a spreading sequence of twelve. Up
`to three RBs may be used in an SC-OFDM symbol to transmit
`three modulated symbols. In this case, because more than one
`sequence is used, the PAPR after the IFFT may be increased.
`In FIG. 3, each WTRU in LTE Release 8 uses one RB that is
`indexed with m. For example, m=l. N is the total number of
`RBs in an SC-FD MA symbol. In LTE-A, the WTRU may use
`more than one RB. For example, RBs indexed with m=0, 1,
`and 2. In this case, the WTRU uses 3 RBs. In LTE Release 8,
`a WTRU can use only a single RB.
`[0031] To send more information in PUCCH as compared
`to LTE Release 8, the WTRU may be assigned more RBs with
`the same spreading sequence and cyclic shift. In this case, the
`WTRU may spread different data symbols with the same
`cyclic shift of the root sequence and map the spread symbols
`on different sets of RBs. Alternatively, the WTRU may be
`assigned the same set of RBs with more cyclic shifts of the
`same root sequence. In this case, the WTRU may spread
`different data symbols with different cyclic shifts of the same
`root sequence and map the spread symbol on the same set of
`RBs. In another alternative, the WTRU may be assigned more
`RBs with possibly different spreading sequences and cyclic
`shifts. In this case, the WTRU may spread different data
`symbols with possibly different cyclic shifts of different root
`sequences and map the spread symbol on different sets of
`RBs. In yet another alternative, the WTRU may be assigned a
`combination of the above. The assignment may be performed
`with L1 or L2/L3 signaling or pre-determined by an implicit
`mapping rule.
`[0032] To control the PAPR increase, an adaptive PUCCH
`transmission method may be used where power-limited
`WTRU s may be required to transmit fewer modulated control
`data symbols in an SC-OFDM symbol. These WTRUs, for
`example may be assigned only a single downlink carrier.
`Alternatively, these WTRUs may be required to report wide(cid:173)
`band CQI/PMI/RI which requires a smaller number of bits or
`these WTRUs may be configured to use more subframes to
`transmit the whole control information. For example, in one
`subframe, the WTRU may transmit the control information
`corresponding to only one downlink component carrier and
`complete transmitting the control information corresponding
`to all component carriers in several subframes. For example,
`in subframe 1, the WTRU may transmit control information
`for downlink component carrier #1, and then in subframe 2,
`the WTRU may transmit the control information for downlink
`component carrier# 2, etc. The WTRU configuration may be
`performed with L1 or L2/L3 signaling.
`[0033] The carrier (or spectrum) edge resource blocks
`(RBs) may be used for control data transmission when an
`LTE-A network is configured to use LTE uplink control chan(cid:173)
`nel structure, as shown in FIG. 3. As shown in FIG. 3 for LTE
`Release 8, the WTRU uses two different RBs in the two time
`
`slots. For example, the RB indexed with m=l is used by one
`WTRU, and m= 1 is on opposite edges of the frequency in the
`two time slots. RBs on opposite edges of the spectrum may be
`used in two time slots for maximum frequency diversity. In
`this case, LTE-A and LTE Release 8 WTRUs may be config(cid:173)
`ured to share the same PUCCH resources within the uplink
`(UL) carrier.
`[0034] Alternatively, a predetermined portion of resources
`may be reserved and allocated for LTE-A PUCCH only. In
`this case, PUCCH'sofLTE WTRUs andLTE-A WTRUsmay
`use different RBs.
`[0035] When there are multiple UL carriers (including one
`LTE carrier) available for the LTE-A WTRU, PUCCH trans(cid:173)
`mission may be performed in one of the LTE-A carriers
`(excluding the LTE carrier), in order to avoid the control data
`to RE mapping collision with LTE, where RE is a resource
`element. In this case, the assignment of a LTE-A carrier may
`be performed on channel conditions, e.g. using the best com(cid:173)
`ponent carrier over all the carriers.
`In another example method for transmission over
`[0036]
`one uplink component carrier, the WTRU and the base station
`may be configured for separate coding of control for down(cid:173)
`link (DL) carriers. In this example, the control data bits for
`different downlink carriers may be coded separately and then
`modulated. The methods disclosed herein above may be used
`for mapping to physical resource elements.
`[0037] The control information for each downlink carrier
`may be transmitted by using different RBs, different spread(cid:173)
`ing sequences/cyclic shifts or a combination of these. As an
`example, RBs m=l and m=3 may be used for control data
`transmission corresponding to two different downlink carri(cid:173)
`ers. In this case, the mapping of the control data resources
`(frequency, sequence, cyclic shift) to the downlink carrier
`may be performed with L1 and/or L2/L3 signaling. This
`mapping may also be performed implicitly by using mapping
`rules. For example, the CQI for the second downlink carrier
`may be transmitted with the same spreading sequence/cyclic
`shift pair as for the first downlink carrier but on the next
`available RB.
`In another embodiment for mapping of CQI, PMI
`[0038]
`and RI to physical resource elements in carrier aggregation,
`the PUCCH that carries the CQI (and any other possible
`control information such as scheduling request, ACK/NACK,
`etc.) is transmitted on more than one uplink component car(cid:173)
`rier. In an example method for transmission on more than one
`uplink carrier, there is one PUCCH per UL component carrier
`carrying control information corresponding to one DL com(cid:173)
`ponent carrier. The same PUCCH structure as in LTE may be
`used in each uplink carrier. Uplink carriers and downlink
`carriers may be linked to each other. Alternatively, if a com(cid:173)
`ponent carrier is also used for LTE WTRU s, then no resource
`allocation is made for LTE-A PUCCH, in order to avoid
`resource collision between LTE-A PUCCH and LTE
`PUCCH. Alternatively, a certain portion of resources may be
`reserved and allocated for LTE-A PUCCH only. In this case,
`PUCCH's ofLTE WTRUs and LTE-A WTRUs will use dif(cid:173)
`ferent RBs. This may allow the network to maintain backward
`compatibility with LTE.
`In another example method for transmission on
`[0039]
`more than one uplink carrier, one PUCCH per UL component
`carrier may carry control data corresponding to several DL
`component carriers. In this example, a combination of the
`methods disclosed hereinabove may be implemented. The
`uplink carrier and the corresponding downlink carriers may
`
`Samsung Ex. 1014
`
`

`

`US 2010/0098012 Al
`
`Apr. 22, 2010
`
`4
`
`be linked to each other. Several methods are available for
`transmitting the control data information. In an example, the
`control information transmitted on each uplink carrier ( cor(cid:173)
`responding to one or several D L component carriers) may be
`coded separately. In another example, the control information
`transmitted on each uplink carrier corresponding to different
`downlink carriers may be coded separately. In yet another
`example, the control information transmitted over all uplink
`carriers may be coded jointly.
`In another embodiment for mapping of CQI, PMI,
`[0040]
`RI and ACK/NACK to physical resource elements in carrier
`aggregation, frequency diversity/hopping over different
`uplink carriers may be implemented. The PUCCH data may
`be transmitted on different uplink carriers at different time
`instances. For example, when the PUCCH may be transmitted
`only on one uplink carrier at any time to maintain low PAPR,
`the PUCCH may be transmitted on different UL component
`carriers using intra-subframe or inter-subframe hopping. The
`same PUCCH can be repeated on different uplink carriers.
`[0041] Disclosed hereinafter are the different reporting
`modes for the CQI information. In LTE, there are three main
`CQI reporting modes: WTRU selected, base station config(cid:173)
`ured subband reporting and wideband reporting. In WTRU
`selected mode, the WTRU selects the best M subbands and
`reports theCQI andPMI to the base station. In the base station
`configured mode, the base station configures a set of sub(cid:173)
`bands, and the WTRU reports the CQI/PMI of the whole set
`or a subset of the set.
`In an example method for use with multiple down(cid:173)
`[0042]
`link carriers, the CQI/PMI/RI for each downlink carrier may
`be selected independently. In another example method for use
`with multiple downlink carriers, all or several of the downlink
`carriers may form an aggregated bandwidth and the CQI/
`PMI/RI may be reported by using this bandwidth. The sub(cid:173)
`bands selected may be different in each carrier or they may
`span more than one carrier. For example, if there are N car(cid:173)
`riers, each with k RBs, then a single carrier ofNk RBs may be
`assumed, and accordingly a wideband CQI/PMI and a single
`RI over Nk RBs may be reported. This approach may be more
`useful when the carriers are contiguous. The latter example
`method may be used when the aggregated carriers are con(cid:173)
`tiguous and former example method may be used over sets of
`non-contiguous carriers.
`[0043] For purposes of discussion, a WTRU has an
`'assigned' carrier and possibly other 'associated' carriers.
`This is also referred to as "anchor" and "non-anchor" com(cid:173)
`ponent carriers. The assigned carrier is a primary carrier that
`e.g., may correspond to the carrier that WTRU may monitor
`to for PDCCH information. The WTRU also has associated
`carriers (secondary) which are, for example, carriers that the
`WTRU is informed may have granted physical downlink
`shared channel (PDSCH) RBs, and thus CQI reporting may
`be required. Associated and assigned carriers may be semi(cid:173)
`statically configured, but may also modified by discontinuous
`reception (DRX) periods, e.g., if one or more of the carriers is
`DRX for a WTRU, it may not be required to send CQI infor(cid:173)
`mation that would correspond to a DRX time-frequency.
`In one reporting example, the WTRU is informed
`[0044]
`via L1, L2/3, or broadcast signaling, which carriers within the
`LTE-A aggregation it should report the best M sub bands and
`CQI/PMI/RI information. The best M sub bands are not pref(cid:173)
`erentially from any particular component carrier.
`In another reporting example, L1, L2/3, or broadcast
`[ 0045]
`signaling may be transmitted to the WTRU selecting the
`
`carriers within the LTE-A aggregation for which the WTRU
`should report the best Ml subbands and CQI/PMI/RI infor(cid:173)
`mation, where Ml is associated with the subcarriers in an
`assigned carrier. Additionally the signal may select which
`component carriers within the LTE-A aggregation that the
`WTRU may report the best M2 subbands and CQI/PMI/RI
`information, where M2 is associated with the subcarriers in
`the associated carriers. For example, WTRU may be config(cid:173)
`ured to report the best Ml subbands from the carrier it is
`assigned to listen for PDCCH and reports the best M2 sub(cid:173)
`bands from K specific other carriers.
`In another reporting example, L1, L2/3, or broadcast
`[0046]
`signaling may be transmitted to the WTRU that identifies or
`selects the carriers within the LTE-A aggregation for which
`the WTRU should report the best M sub bands and CQI/PMI/
`RI information for each associated DL carrier, e.g., the CQI
`for best M sub bands within each carrier are reported.
`In another reporting example, L1, L2/3, or broadcast
`[0047]
`signaling may be transmitted to the WTRU that identifies or
`selects the carrier within the LTE-A aggregation for which the
`WTRU should report the wideband CQI, e.g., where the
`wideband CQI report corresponds to the carrier that the
`WTRU is assigned to listen to for the PDCCH, i.e., wideband
`assigned carrier CQI reporting.
`In another reporting example, L1, L2/3, or broadcast
`[0048]
`signaling may be transmitted to the WTRU indicating which
`carriers are associated carriers within the LTE-A aggregation
`for which it should report carrier wide CQI/PMI/RI. The
`WTRU may be configured to transmit a network defined set of
`wideband CQI reports. Carrier wide is meant to cover the fact
`that "associated carriers" may mean multiple carriers and we
`want to report for all. In addition, separate reports for each of
`these component carriers may be sent.
`In another reporting example, L1, L2/3, or broadcast
`[0049]
`signaling may be transmitted to the WTRU indicating which
`carriers are associated carriers within the LTE-A aggregation
`for which the WTRU should report the best