PTOfSB/14 (07-07)
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`Application Data Sheet 37 CFR 1.76
`
`Title of Invention I PUCCH Resource Allocation for Carrier Aggregation in LTE-Advanced
`
`Application Number
`
`Attorney Docket Number
`
`4015-6942 / P30138-US2
`
`The application data sheet is part of the provisional or nonprovisional application for which it is being submitted. The following form contains the
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`Title of Invention I PUCCH Resource Allocation for Carrier Aggregation in L TE-Advanced
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`Application Data Sheet 37 CFR 1.76
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`Title of Invention I PUCCH Resource Allocation for Carrier Aggregation in L TE-Advanced
`
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`Application Data Sheet 37 CFR 1.76
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`Title of Invention I PUCCH Resource Allocation for Carrier Aggregation in L TE-Advanced
`
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`
`Attorney Docket Number
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`4015-6942 / P30138-US2
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`PTO/SB/14 (07-07)
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`Application Data Sheet 37 CFR 1. 76
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`Title of Invention I PUCCH Resource Allocation for Carrier Aggregation in L TE-Advanced
`
`Application Number
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`First Name
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`David
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`Bennett
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`32194
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`4015-6942
`P30138-US2
`
`PUCCH RESOURCE ALLOCATION FOR CARRIER AGGREGATION
`IN L TE-ADVANCED
`
`RELATED APPLICATION
`
`[001] This application claims the benefit of U.S. Provisional Patent Application
`
`61/248,661 filed October 5, 2009, which is incorporated herein by reference.
`
`TECHNICAL FIELD
`
`[002) The present invention relates generally to carrier aggregation in a mobile
`
`communication system and, more particularly, to an efficient resource allocation for the
`
`physical uplink control channel for carrier aggregation.
`
`BACKGROUND
`
`[003] Carrier aggregation is one of the new features being discussed for the next
`
`generation of Long Term Evolution (L TE) systems, which is being standardized as part
`
`of L TE Release 10 (known as L TE-Advanced). L TE Rel 8 currently supports bandwidths
`
`up to 20 MHz. In L TE-Advanced, bandwidths up to 100 MHz will be supported. The
`
`very high data rates contemplated for L TE-Advanced will require an expansion of the
`
`transmission bandwidth.
`
`In order to maintain backward compatibility with L TE Rel-8
`
`user terminals, the available spectrum is divided into Rel-8 compatible chunks called
`
`component carriers. Carrier aggregation enables the needed bandwidth expansion by
`
`allowing user terminals to transmit data over multiple component carriers comprising up
`
`to 100 MHz of spectrum. Carrier aggregation also ensures efficient use of a wide carrier
`
`for legacy terminals by making it possible for legacy terminals to be scheduled in all
`
`parts of the wideband L TE-Advanced carrier.
`
`[004] The number of aggregated component carriers, as well as the bandwidth of the
`
`individual component carrier, may be different for Uplink (UL) and Downlink (DL). A
`
`1
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`symmetric configuration refers to the case where the number of component carriers in
`
`downlink and uplink is the same. An asymmetric configuration refers to the case where
`
`the number of component carriers is different. The number of component carriers
`
`configured for a geographic cell area may be different from the number of component
`
`carriers seen by a terminal. A user terminal, for example, may support more downlink
`
`component carriers than uplink component carriers, even though in the geographic cell
`
`area the same number of uplink and downlink component carriers is offered by the
`
`network.
`
`[005] One consideration for carrier aggregation is how to transmit control signaling
`
`from the user terminal on the uplink from the user terminal. Uplink control signaling may
`
`include acknowledgement (ACK) signaling for hybrid automatic repeat request (HARO)
`
`protocols, channel state and quality information (CSI, CQI) reporting for downlink
`
`scheduling, and scheduling requests (SRs) indicating that the user terminal needs uplink
`
`resources for uplink data transmissions. One solution is to transmit the uplink control
`
`information on multiple uplink component carriers associated with different downlink
`
`component carriers. However, this option is likely to result in higher user terminal power
`
`consumption and a dependency on speciflc userterminal capabilities. It may also create
`
`implementation issues due to inter-modulation products, and may lead to generally
`
`higher complexity for implementation and testing.
`
`SUMMARY
`
`[006) The invention provides a signaling mechanism for efficient transmission of control
`
`information in a communication system using carrier aggregation. The signaling
`
`mechanism allows the transmission, on a single uplink component carrier, of control
`
`information associated with downlink transmissions on multiple aggregated downlink
`
`component carriers. Semi-statically reserved resources for the transmission of control
`
`2
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`information on the uplink component carrier may be dynamically shared by user
`
`terminals that are assigned multiple downlink component carriers for downlink
`
`transmissions. Implicit or explicit resource indication can be used in combination with
`
`dynamic resource indication.
`
`[007] One exemplary embodiment of the invention comprises a method implemented
`
`by a base station of receiving control information from user terminals. The method
`
`comprises scheduling downlink transmissions to said user terminal on one or more
`
`downlink component carriers; if the user terminal is scheduled to receive downlink
`
`transmissions on a first single downlink component carrier, receiving control information
`
`associated with the downlink transmissions to the user terminal on a first set of radio
`
`resources on a uplink primary component carrier associated with said first downlink
`
`component carrier; and if the user terminal is scheduled to receive downlink
`
`transmissions on a second single downlink component carrier or multiple downlink
`
`component carriers, receiving control information associated with the downlink
`
`transmissions to the user terminal on a second set of radio resources on the uplink
`
`primary component carrier.
`
`[008j · Another exempiary embodiment of the invention comprises a base station for
`
`transmitting data to one or more user terminals. The base station comprises a
`
`transmitter to transmit user data on one or more downlink component carriers to a user
`
`terminal; and a controller to schedule downlink transmissions to the user terminal. The
`
`controller is configured to schedule downlink transmissions to the user terminal on one
`
`or more downlink component carriers; if the user terminal is scheduled to receive
`
`downlink transmissions on a first single downlink component carrier, receive control
`
`information associated with the downlink transmissions to the user terminal on a first set
`
`of radio resources on a uplink primary component carrier associated with said first
`
`downlink component carrier; and, if the user terminal is scheduled to receive downlink
`
`3
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`transmissions on a second single downlink component carrier or multiple downlink
`
`component carriers, receive control information associated with the downlink
`
`transmissions to the user terminal on a second set of radio resources on the uplink
`
`primary component carrier ..
`
`[009] Another exemplary embodiment of the invention comprises a method of
`
`transmitting control information implemented by a user terminal in a mobile
`
`communication network. The method comprises receiving an assignment of radio
`
`resources for downlink transmissions from a base station; transmitting control
`
`information associated with the downlink transmissions on a first set of radio resources
`
`on an uplink component carrier if an assignment of single downlink component carrier for
`
`the downlink transmission is received; and transmitting control information associated
`
`with the downlink transmissions on a second set of radio resources on the uplink
`
`component carrier if an assignment of multiple downlink component carriers for the
`
`downlink transmission is received.
`
`[01 OJ Another exemplary embodiment of the invention comprises a user terminal
`
`configured to send control information associated with downlink transmissions on one or
`
`more downiink component carriers. The userterminai comprises a receiver to receive
`
`downlink transmissions from a base station; a transmitter to transmit control information
`
`associated with the downlink transmission to a base station; and a controller to select
`
`radio resources for transmission of control information associated with the downlink
`
`transmissions. The controller is configured to select a. first set of radio resources on an
`
`uplink component carrier if an assignment of a single downlink component carrier for the
`
`downlink transmission is received; and select a second set of radio resources on the
`
`uplink component carrier if an assignment of multiple downlink component carriers lor
`
`the downlink transmission is received.
`
`4
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`[011] Another exemplary embodiment of the invention comprises an alternate method
`
`of transmitting control information implemented by a user terminal in a mobile
`
`communication network. The method comprises receiving an assignment of radio
`
`resources for a downlink transmissions from a base station; transmitting control
`
`information associated with the downlink transmission on a first set of radio resources on
`
`an uplink component carrier if an assignment of a first downlink component carrier for
`
`the downlink transmission is received; and transmitting control information associated
`
`with the downlink transmission on a second set of radio resources on the uplink
`
`component carrier if an assignment of a second downlink component carrier for the
`
`downlink transmission is received.
`
`[012] Another exemplary embodiment of the invention comprises a user terminal
`
`configured to send control information associated with downlink transmissions on one or
`
`more downlink component carriers. The user terminal comprises a receiver to receive
`
`downlink transmissions from a base station; a transmitter to transmit control information
`
`associated with the downlink transmission to a base station; and a controller to select
`
`radio resources for transmission of control information associated with the downlink
`
`transniisston. · The controller is configured to select a first set of radio resources on an
`
`uplink component carrier if an assignment of a first downlink component carrier for the
`
`downlink transmission is received; and select a second set of radio resources on the
`
`uplink component carrier if an assignment of a second downlink component carrier for
`
`the downlink transmission is received.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[013] Fig. 1 illustrates an·exemplary OFDM communication system.
`
`[014] Fig. 2 illustrates an exemplary time-frequency grid for an OFDM system.
`
`[015) Fig. 3 illustrates an exemplary time-domain structure for an OFDM system.
`
`5
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`[016] Fig. 4 illustrates uplink L 1/L2 control signaling transmission on PUCCH.
`
`[017] Fig. 5 illustrates the PUCCH format 1 using a normal _cyclic prefix.
`
`[018] Fig. 6 illustrates the PUCCH format 2 using a normal cyclic prefix.
`
`[019] Fig. 7 illustrates an exemplary allocation of resource blocks for PUCCH.
`
`[020] Fig. 8 illustrates the concept of carrier aggregation.
`
`[021] Fig. 9 illustrates an exemplary method implemented by a base station of
`
`receiving control information from user terminals scheduled on a single carrier and
`
`multiple carriers.
`
`[022] Fig. 10 illustrates an exemplary method implemented by a user terminal of
`
`signaling control information to a base station.
`
`[023] Fig. 11 illustrates another exemplary method implemented by a user terminal of
`
`signaling control information to a base station.
`
`[024) Fig. 12 illustrates an exemplary base station with a controller for controlling
`
`downlink transmissions by the base station to one or more user terminals and
`
`associated transmissions of uplink control information by the user terminals
`
`[025) Fig. 13 illustrates an exemplary user terminal with a controller for controlling
`transmission ofupiink control information lo a ba.se station.
`
`DETAILED DESCRIPTION
`
`[026] Referring now to the drawings, Fig. 1 illustrates an exemplary mobile
`
`communication network 10 for providing wireless communication services tq user
`
`terminals 100. Three user terminals 100 are shown in Fig. 1. The user terminals 100
`
`may comprise, for example, cellular telephones, personal digital assistants, smart
`
`phones, laptop computers, handhetd computers, or other devices with wireless
`
`communication capabilities. The mobile communication network 10 comprises a
`
`plurality of geographic cell areas or sectors 12. Each geographic cell area or sector 12
`
`6
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`
`I I
`t
`
`is served by a base station 20, which is referred to in L TE as a NodeB or Enhanced
`
`Nod~B (eNodeB). A single base station 20 may provide service in multiple geographic
`
`cell areas or sectors 12. The user terminals 100 receive signals from a serving base
`
`station 20 on one or more downlink (DL) channels, and transmit signals to the base
`
`station 20 on one or more uplink (UL) channels.
`
`[027) For illustrative purposes, an exemplary embodiment of the present invention wilt
`
`be described in the context of a Long-Term Evolution (L TE) system. Those skilled in the
`
`art will appreciate, however, that the present invention is more generally applicable to
`
`other wireless communication systems, including Wideband Code-Division Multiple
`
`Access (WCDMA) and WiMax (IEEE 802.16) systems.
`
`[028] L TE uses Orthogonal Frequency Division Multiplexing (OFDM) in the downlink
`
`and Discrete Fourier Transform (DFT) spread OFDM in the uplink. The basic L TE
`
`downlink physical resource can be viewed as a time-frequency grid. Fig. 2 illustrates a
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`portion of an exemplary OFDM time-frequency grid 50 for L TE. Generally speaking, the
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`time-frequency grid 50 is divided into one millisecond subframes. Each subframe
`
`includes a number of OFDM symbols. For a normal cyclic prefix (CP) length, suitable for
`
`use in situations where muitipath dispersion ls not expected to be extremely severe, a
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`subframe comprises fourteen OFDM symbols. A subframe comprises twelve OFDM
`
`symbols if an extended cyclic prefix is used. In the frequency domain, the physical
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`resources are divided into adjacent subcarriers with a spacing of 15 kHz. The number of
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`subcarriers varies according to tbe allocated system bandwidth. The smallest eler:nent
`
`of the time-frequency grid 50 is a resource element. A resource element comprises one
`
`OFDM subcarrier during one OFDM symbol interval.
`
`[0291
`
`In L TE systems, data is transmitted to the user terminals over a downlink
`
`transport channel known as the Physical Downlink Shared Channel {POSCH). The
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`POSCH is a time and frequency multiplexed channel shared by a plurality of user
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`terminals. As shown in Fig. 3, the downlink transmissions are organized into 1 O ms
`
`radio frames. Each .radio frame comprises ten equally-sized subframes. For purposes
`
`of scheduling users to receive downlink transmissions, the downlink time-frequency
`
`resources are allocated in units called resource blocks (RBs). Each resource block
`
`spans twelve subcarriers {which may be adjacent or distributed across the frequency
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`spectrum) and one 0.5 ms slot {one half of one subframe). The term "resource block
`
`pair" refers to two consecutive resource blocks occupying an entire one millisecond
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`subframe.
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`[030] The base station 20 dynamically schedules downlink transmissions to the user
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`terminals based on channel state· and quality information (CSI, COi) reports from the
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`user terminals on the Physical Uplink Control Channel (PUCCH) or Physical Uplink
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`Shared Channel {PUSCH). The COi and CSI reports indicate the instantaneous channel
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`conditions as seen by the receiver. In each subframe, the base station 20 transmits
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`downlink control information (DCI) identifying the user terminals that have been
`
`scheduled to receive data (hereinafter the scheduled terminals) in the current downlink
`
`subframe and the resource blocks on which the data is being transmitted to the
`
`scheduied tem1inais. The DCI is typicaiiyiransmitted oh the Physical Dowriiink Contini
`
`Channel (PDCCH) in the first 1, 2, or 3 OFDM symbols in each subframe.
`
`[031) Hybrid Automatic Repeat Request {HARO) is used to mitigate errors that occur
`
`during transmission of data on the downlink. When the base station 20 indicates that a
`
`user terminal 100 is scheduled to receive a transmission on the POSCH, the user
`
`terminal 100 decodes the PDSCH and transmits an acknowledgement (ACK/NACK
`
`message to base station 20 on the PUCCH or PUSCH. The acknowledgement
`
`message informs the base station 20 whether the data packet was correctly received by
`
`the user terminal 100. The acknowledgement message could be either a positive
`
`acknowledgement {ACK) indicating a successful decoding or a negative
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`acknowledgement (NACK) message indicating a decoding failure. Based on the
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`acknowledgement message received frQm the user terminal 100, base station 20
`
`determines whether to transmit new data (ACK received) or to retransmit the previous
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`data {NACK received).
`
`[032] For uplink transmissions, the user terminals transmit scheduling requests (SRs)
`
`to the base station 20 on the PUCCH when the user terminals have data to send but no
`
`valid uplink grant. The base stations 20 allocate uplink resources responsive to the
`
`scheduling requests and transmit a scheduling grant to the user terminal 100 on the
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`PDCCH. When the data is received, the base station 20 transmits ACK/NACK signaling
`
`-
`.
`to the user terminal 100 on the Physical Hybrid Automatic Repeat Request Indicator
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`Channel. (PHICH) to indicate whether the data is received correctly.
`
`[033]
`
`If the user terminal 100 has not been assigned an uplink resource for data
`
`transmission, the L 1/L2 control information (CQI reports, ACK/NACKs, and SRs} is
`
`transmitted in uplink resources (resource blocks) specifically assigned for uplink
`
`transmission of L 1/L2 control information on the Physical Uplink Control Channel
`
`(PUCCH}. As illustrated in Fig. 4, these resources are located at the edges of the total
`
`availabie c-eii bandwidth. Each PUCCH resource comprises ofcme resource biock
`
`(twelve subcarriers) within each of the two slots of an uplink subframe. Frequency
`
`hopping is used to provide frequency diversity. The frequency of the resource blocks
`
`alternate at the slot boundary, with one resource block at the upper part of the spectrum
`
`within the first slot of a subframe and an equally sized r.esource block at the lower part of
`
`the spectrum during the second slot of the subframe, or vice versa. If more resources
`
`are needed for the uplink L 1 /L2 control signaling, e.g., in case of very large overall
`
`transmission bandwidth supporting a large number of users, additional resources blocks
`
`can be assigned adjacent the previously assigned resource blocks.
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`[034) The reasons for locating the PUCCH resources at the edges of the overall
`
`available spectrum are two-fold. First, the allocation maximizes the frequency diversity,
`
`particularly when frequency hopping is employed. Second, the allocation avoids
`
`fragmentation of the uplink spectrum, which would make it impossible to assign very
`
`wide transmission bandwidths to a single user terminal 100 and still retain the single(cid:173)
`
`carrier property of the uplink transmission.
`
`[035) The bandwidth of one resource block during one subframe is too large for the
`
`control signaling needs of a single user terminal 100. Therefore, to efficiently exploit the
`
`resources set aside for control signaling, multiple user terminals can share the same
`
`resource block. This is done by assigning the different terminals different orthogonal
`
`phase rotations of a cell-specific length-1 2 frequency-domain sequence. A linear phase
`
`rotation in the frequency domain is equivalent to applying a cyclic shift in the time
`
`domain. Thus, although the term "phase rotation" is used herein, the term cyclic shift is
`
`r ; . ,.
`
`sometimes used with an implicit reference to the time domain.
`
`[036) The resource used by a PUCCH is therefore not only specified in the time(cid:173)
`
`frequency domain by the resource-block pair, but also by the phase rotation applied.
`Simiiariy to the case of reference sighais; there are up to twehie different phase rofatioris
`
`specified in the L TE standard, providing up to twelve different orthogonal sequences
`
`from each cell-specific sequence. However, in the case of frequency-selective channels,
`
`not all the twelve phase rotations can be used if orthogonality is to be maintained .
`
`. Typically, up to six rotations are considered usable in a cell,
`
`(037) There are two message formats defined for transmission of control information
`
`on the PUCCH, each capable of carrying a different number of bits. A user terminal 100
`
`uses PUCCH format 1 to transmit HARQ acknowledgements and scheduling requests.
`
`For CQI reporting, the user terminal 100 uses PUCCH format 2.
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`[038] Hybrid-ARO acknowledgements are used to acknowledge the reception of one
`
`(or two in case of spatial multiplexing) transport blocks in the downlink. S