WO2011152673A2 - Method and system for transmitting channel state information in wireless communication systems - Google Patents

Method and system for transmitting channel state information in wireless communication systems Download PDF

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Publication number
WO2011152673A2
WO2011152673A2 PCT/KR2011/004051 KR2011004051W WO2011152673A2 WO 2011152673 A2 WO2011152673 A2 WO 2011152673A2 KR 2011004051 W KR2011004051 W KR 2011004051W WO 2011152673 A2 WO2011152673 A2 WO 2011152673A2
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Prior art keywords
prb
csi
pusch
uci
accordance
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French (fr)
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WO2011152673A3 (en
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Young-Han Nam
Jianzhong Zhang
Jin-Kyu Han
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority to EP11790031.6A priority Critical patent/EP2577897B1/en
Priority to KR1020127033711A priority patent/KR101852854B1/ko
Priority to CN201180027314.5A priority patent/CN102934381B/zh
Priority to EP22167321.3A priority patent/EP4047847A1/en
Priority to JP2013513113A priority patent/JP5781605B2/ja
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072—Error control for data other than payload data, e.g. control data
    • H04L1/0073—Special arrangements for feedback channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the present application relates generally to wireless communications and, more specifically, to a method and system for transmitting channel state information in wireless communication systems.
  • Orthogonal Frequency Division Multiplexing is adopted as a downlink (DL) transmission scheme.
  • a base station includes a transmit path circuitry configured to transmit an uplink grant in a downlink control information (DCI) format to a subscriber station.
  • the base station also includes a receive path circuitry configured to receive only uplink control information (UCI) on a physical uplink shared channel (PUSCH) from the subscriber station when the uplink grant includes a modulation and coding scheme (MCS) of an enabled transport block (TB) with a value of 29, or a redundancy version of the PUSCH is 1; a channel state information (CSI) request field with a non-zero value; and a total number of physical resource blocks allocated for the subscriber station, N PRB , with a value less than or equal to a threshold number of physical resource blocks, T PRB .
  • MCS modulation and coding scheme
  • CSI channel state information
  • T PRB is based at least partly upon one of a total number of CSI information bits to be transmitted on the PUSCH, N total , and a number of downlink component carriers (DL CCs) reported in a current CSI reporting, N CCs .
  • N total a total number of CSI information bits to be transmitted on the PUSCH
  • DL CCs downlink component carriers
  • a method of operating a base station includes transmitting an uplink grant in a downlink control information (DCI) format to a subscriber station.
  • the method also includes receiving only uplink control information (UCI) on a physical uplink shared channel (PUSCH) from the subscriber station when the uplink grant includes a modulation and coding scheme (MCS) of an enabled transport block (TB) with a value of 29, or a redundancy version of the PUSCH with a value of 1; a channel state information (CSI) request field with a non-zero value; and a total number of physical resource blocks allocated for the subscriber station, N PRB , with a value less than or equal to a threshold number of physical resource blocks, T PRB .
  • MCS modulation and coding scheme
  • CSI channel state information
  • T PRB is based at least partly upon one of a total number of CSI information bits to be transmitted on the PUSCH, N total , and a number of downlink component carriers (DL CCs) reported in a current CSI reporting, N CCs .
  • N total a total number of CSI information bits to be transmitted on the PUSCH
  • DL CCs downlink component carriers
  • a subscriber station includes a receive path circuitry configured to receive an uplink grant in a downlink control information (DCI) format from a base station.
  • the subscriber station also includes a transmit path circuitry configured to transmit only uplink control information (UCI) on a physical uplink shared channel (PUSCH) to the base station when the uplink grant includes a modulation and coding scheme (MCS) of an enabled transport block (TB) with a value of 29, or a redundancy version of the PUSCH with a value of 1; a channel state information (CSI) request field with a non-zero value; and a total number of physical resource blocks allocated for the subscriber station, , with a value less than or equal to a threshold number of physical resource blocks, T PRB .
  • MCS modulation and coding scheme
  • CSI channel state information
  • T PRB is based at least partly upon one of a total number of CSI information bits to be transmitted on the PUSCH, N total , and a number of downlink component carriers (DL CCs) reported in a current CSI reporting, N CCs .
  • N total a total number of CSI information bits to be transmitted on the PUSCH
  • DL CCs downlink component carriers
  • a method of operating a subscriber station includes receiving an uplink grant in a downlink control information (DCI) format from a base station.
  • the method also includes transmitting only uplink control information (UCI) on a physical uplink shared channel (PUSCH) to the base station when the uplink grant includes a modulation and coding scheme (MCS) of an enabled transport block (TB) with a value of 29, or a redundancy version of the PUSCH with a value of 1; a channel state information (CSI) request field with a non-zero value; and a total number of physical resource blocks allocated for the subscriber station, N PRB , with a value less than or equal to a threshold number of physical resource blocks, T PRB .
  • MCS modulation and coding scheme
  • CSI channel state information
  • T PRB is based at least partly upon one of a total number of CSI information bits to be transmitted on the PUSCH, N total , and a number of downlink component carriers (DL CCs) reported in a current CSI reporting, N CCs .
  • N total a total number of CSI information bits to be transmitted on the PUSCH
  • DL CCs downlink component carriers
  • FIGURE 1 illustrates an exemplary wireless network that transmits messages in the uplink according to the principles of this disclosure
  • FIGURE 2 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) transmitter according to one embodiment of this disclosure
  • FIGURE 3 is a high-level diagram of an OFDMA receiver according to one embodiment of this disclosure.
  • FIGURE 4 illustrates a diagram of a base station in communication with a plurality of mobile stations according to an embodiment of this disclosure
  • FIGURE 5 illustrates a spatial division multiple access (SDMA) scheme according to an embodiment of this disclosure
  • FIGURE 6 illustrates a method of operating a base station according to an embodiment of this disclosure.
  • FIGURE 7 illustrates a method of operating a subscriber station according to an embodiment of this disclosure.
  • FIGURES 1 through 7, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless communication system.
  • LTE terms “node B”, “enhanced node B”, and “eNodeB” are other terms for “base station” used below.
  • LTE term “user equipment” or “UE” is another term for “subscriber station” used below.
  • FIGURE 1 illustrates exemplary wireless network 100, which transmits messages according to the principles of the present disclosure.
  • wireless network 100 includes base station (BS) 101, base station (BS) 102, base station (BS) 103, and other similar base stations (not shown).
  • Base station 101 is in communication with Internet 130 or a similar IP-based network (not shown).
  • Base station 102 provides wireless broadband access to Internet 130 to a first plurality of subscriber stations within coverage area 120 of base station 102.
  • the first plurality of subscriber stations includes subscriber station 111, which may be located in a small business (SB), subscriber station 112, which may be located in an enterprise (E), subscriber station 113, which may be located in a WiFi hotspot (HS), subscriber station 114, which may be located in a first residence (R), subscriber station 115, which may be located in a second residence (R), and subscriber station 116, which may be a mobile device (M), such as a cell phone, a wireless laptop, a wireless PDA, or the like.
  • SB small business
  • E enterprise
  • subscriber station 113 which may be located in a WiFi hotspot (HS)
  • subscriber station 114 which may be located in a first residence (R)
  • subscriber station 115 which may be located in a second residence (R)
  • subscriber station 116 which may be a mobile device
  • Base station 103 provides wireless broadband access to Internet 130 to a second plurality of subscriber stations within coverage area 125 of base station 103.
  • the second plurality of subscriber stations includes subscriber station 115 and subscriber station 116.
  • base stations 101-103 may communicate with each other and with subscriber stations 111-116 using OFDM or OFDMA techniques.
  • wireless network 100 may provide wireless broadband access to additional subscriber stations. It is noted that subscriber station 115 and subscriber station 116 are located on the edges of both coverage area 120 and coverage area 125. Subscriber station 115 and subscriber station 116 each communicate with both base station 102 and base station 103 and may be said to be operating in handoff mode, as known to those of skill in the art.
  • Subscriber stations 111-116 may access voice, data, video, video conferencing, and/or other broadband services via Internet 130.
  • one or more of subscriber stations 111-116 may be associated with an access point (AP) of a WiFi WLAN.
  • Subscriber station 116 may be any of a number of mobile devices, including a wireless-enabled laptop computer, personal data assistant, notebook, handheld device, or other wireless-enabled device.
  • Subscriber stations 114 and 115 may be, for example, a wireless-enabled personal computer (PC), a laptop computer, a gateway, or another device.
  • FIGURE 2 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) transmit path 200.
  • FIGURE 3 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) receive path 300.
  • the OFDMA transmit path 200 is implemented in base station (BS) 102 and the OFDMA receive path 300 is implemented in subscriber station (SS) 116 for the purposes of illustration and explanation only.
  • BS base station
  • SS subscriber station
  • the OFDMA receive path 300 may also be implemented in BS 102 and the OFDMA transmit path 200 may be implemented in SS 116.
  • the transmit path 200 in BS 102 comprises a channel coding and modulation block 205, a serial-to-parallel (S-to-P) block 210, a Size N Inverse Fast Fourier Transform (IFFT) block 215, a parallel-to-serial (P-to-S) block 220, an add cyclic prefix block 225, and an up-converter (UC) 230.
  • S-to-P serial-to-parallel
  • IFFT Inverse Fast Fourier Transform
  • P-to-S parallel-to-serial
  • UC up-converter
  • the receive path 300 in SS 116 comprises a down-converter (DC) 255, a remove cyclic prefix block 260, a serial-to-parallel (S-to-P) block 265, a Size N Fast Fourier Transform (FFT) block 270, a parallel-to-serial (P-to-S) block 275, and a channel decoding and demodulation block 280.
  • DC down-converter
  • S-to-P serial-to-parallel
  • FFT Size N Fast Fourier Transform
  • P-to-S parallel-to-serial
  • FIGURES 2 and 3 may be implemented in software while other components may be implemented by configurable hardware or a mixture of software and configurable hardware.
  • the FFT blocks and the IFFT blocks described in the present disclosure document may be implemented as configurable software algorithms, where the value of Size N may be modified according to the implementation.
  • the present disclosure is directed to an embodiment that implements the Fast Fourier Transform and the Inverse Fast Fourier Transform, this is by way of illustration only and should not be construed to limit the scope of the disclosure. It will be appreciated that in an alternate embodiment of the disclosure, the Fast Fourier Transform functions and the Inverse Fast Fourier Transform functions may easily be replaced by Discrete Fourier Transform (DFT) functions and Inverse Discrete Fourier Transform (IDFT) functions, respectively.
  • DFT Discrete Fourier Transform
  • IDFT Inverse Discrete Fourier Transform
  • the value of the N variable may be any integer number (i.e., 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of the N variable may be any integer number that is a power of two (i.e., 1, 2, 4, 8, 16, etc.).
  • channel coding and modulation block 205 receives a set of information bits, applies coding (e.g., Turbo coding) and modulates (e.g., QPSK, QAM) the input bits to produce a sequence of frequency-domain modulation symbols.
  • Serial-to-parallel block 210 converts (i.e., de-multiplexes) the serial modulated symbols to parallel data to produce N parallel symbol streams where N is the IFFT/FFT size used in BS 102 and SS 116.
  • Size N IFFT block 215 then performs an IFFT operation on the N parallel symbol streams to produce time-domain output signals.
  • Parallel-to-serial block 220 converts (i.e., multiplexes) the parallel time-domain output symbols from Size N IFFT block 215 to produce a serial time-domain signal.
  • Add cyclic prefix block 225 then inserts a cyclic prefix to the time-domain signal.
  • up-converter 230 modulates (i.e., up-converts) the output of add cyclic prefix block 225 to RF frequency for transmission via a wireless channel.
  • the signal may also be filtered at baseband before conversion to RF frequency.
  • the transmitted RF signal arrives at SS 116 after passing through the wireless channel and reverse operations performed at BS 102.
  • Down-converter 255 down-converts the received signal to baseband frequency and remove cyclic prefix block 260 removes the cyclic prefix to produce the serial time-domain baseband signal.
  • Serial-to-parallel block 265 converts the time-domain baseband signal to parallel time domain signals.
  • Size N FFT block 270 then performs an FFT algorithm to produce N parallel frequency-domain signals.
  • Parallel-to-serial block 275 converts the parallel frequency-domain signals to a sequence of modulated data symbols.
  • Channel decoding and demodulation block 280 demodulates and then decodes the modulated symbols to recover the original input data stream.
  • Each of base stations 101-103 may implement a transmit path that is analogous to transmitting in the downlink to subscriber stations 111-116 and may implement a receive path that is analogous to receiving in the uplink from subscriber stations 111-116.
  • each one of subscriber stations 111-116 may implement a transmit path corresponding to the architecture for transmitting in the uplink to base stations 101-103 and may implement a receive path corresponding to the architecture for receiving in the downlink from base stations 101-103.
  • the total bandwidth in an OFDM system is divided into narrowband frequency units called subcarriers.
  • the number of subcarriers is equal to the FFT/IFFT size N used in the system.
  • the number of subcarriers used for data is less than N because some subcarriers at the edge of the frequency spectrum are reserved as guard subcarriers. In general, no information is transmitted on guard subcarriers.
  • the transmitted signal in each downlink (DL) slot of a resource block is described by a resource grid of subcarriers and OFDM symbols.
  • the quantity depends on the downlink transmission bandwidth configured in the cell and fulfills , where and are the smallest and largest downlink bandwidth, respectively, supported.
  • subcarriers are considered the smallest elements that are capable of being modulated.
  • Each element in the resource grid for antenna port P is called a resource element (RE) and is uniquely identified by the index pair (k,l) in a slot where and are the indices in the frequency and time domains, respectively.
  • Resource element (k,l) on antenna port P corresponds to the complex value . If there is no risk for confusion or no particular antenna port is specified, the index P may be dropped.
  • DL reference signals In LTE, DL reference signals (RSs) are used for two purposes. First, UEs measure channel quality information (CQI), rank information (RI) and precoder matrix information (PMI) using DL RSs. Second, each UE demodulates the DL transmission signal intended for itself using the DL RSs.
  • DL RSs are divided into three categories: cell-specific RSs, multi-media broadcast over a single frequency network (MBSFN) RSs, and UE-specific RSs or dedicated RSs (DRSs).
  • Cell-specific reference signals are transmitted in all downlink subframes in a cell supporting non-MBSFN transmission. If a subframe is used for transmission with MBSFN, only the first a few (0, 1 or 2) OFDM symbols in a subframe can be used for transmission of cell-specific reference symbols.
  • the notation R P is used to denote a resource element used for reference signal transmission on antenna port P.
  • UE-specific reference signals (or dedicated RS: DRS) are supported for single-antenna-port transmission on the Physical Downlink Shared Channel (PDSCH) and are transmitted on antenna port 5.
  • PDSCH Physical Downlink Shared Channel
  • the UE is informed by higher layers whether the UE-specific reference signal is present and is a valid phase reference for PDSCH demodulation or not.
  • UE-specific reference signals are transmitted only on the resource blocks upon which the corresponding PDSCH is mapped.
  • the time resources of an LTE system are partitioned into 10 msec frames, and each frame is further partitioned into 10 subframes of one msec duration each.
  • a subframe is divided into two time slots, each of which spans 0.5 msec.
  • a subframe is partitioned in the frequency domain into multiple resource blocks (RBs), where an RB is composed of 12 subcarriers.
  • FIGURE 4 illustrates a diagram 400 of a base station 420 in communication with a plurality of mobile stations 402, 404, 406, and 408 according to an embodiment of this disclosure.
  • base station 420 simultaneously communicates with multiple of mobile stations through the use of multiple antenna beams, each antenna beam is formed toward its intended mobile station at the same time and same frequency.
  • Base station 420 and mobile stations 402, 404, 406, and 408 are employing multiple antennas for transmission and reception of radio wave signals.
  • the radio wave signals can be Orthogonal Frequency Division Multiplexing (OFDM) signals.
  • base station 420 performs simultaneous beamforming through a plurality of transmitters to each mobile station. For instance, base station 420 transmits data to mobile station 402 through a beamformed signal 410, data to mobile station 404 through a beamformed signal 412, data to mobile station 406 through a beamformed signal 414, and data to mobile station 408 through a beamformed signal 416. In some embodiments of this disclosure, base station 420 is capable of simultaneously beamforming to the mobile stations 402, 404, 406, and 408. In some embodiments, each beamformed signal is formed toward its intended mobile station at the same time and the same frequency. For the purpose of clarity, the communication from a base station to a mobile station may also be referred to as downlink communication, and the communication from a mobile station to a base station may be referred to as uplink communication.
  • Base station 420 and mobile stations 402, 404, 406, and 408 employ multiple antennas for transmitting and receiving wireless signals.
  • the wireless signals may be radio wave signals, and the wireless signals may use any transmission scheme known to one skilled in the art, including an Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Mobile stations 402, 404, 406, and 408 may be any device that is capable receiving wireless signals. Examples of mobile stations 402, 404, 406, and 408 include, but are not limited to, a personal data assistant (PDA), laptop, mobile telephone, handheld device, or any other device that is capable of receiving the beamformed transmissions.
  • PDA personal data assistant
  • a MIMO system can be implemented with the schemes of spatial multiplexing, a transmit/receive beamforming, or transmit/receive diversity.
  • multi-user MIMO is a communication scenario where a base station with multiple transmit antennas can simultaneously communicate with multiple mobile stations through the use of multi-user beamforming schemes such as Spatial Division Multiple Access (SDMA) to improve the capacity and reliability of a wireless communication channel.
  • SDMA Spatial Division Multiple Access
  • FIGURE 5 illustrates a SDMA scheme according to an embodiment of this disclosure.
  • base station 420 is equipped with 8 transmit antennas while mobile stations 402, 404, 406, and 408 are each equipped two antennas.
  • base station 420 has eight transmit antennas.
  • Each of the transmit antennas transmits one of beamformed signals 410, 502, 504, 412, 414, 506, 416, and 508.
  • mobile station 402 receives beamformed transmissions 410 and 502
  • mobile station 404 receives beamformed transmissions 504 and 412
  • mobile station 406 receives beamformed transmissions 506 and 414
  • mobile station 408 receives beamformed transmissions 508 and 416.
  • base station 420 Since base station 420 has eight transmit antenna beams (each antenna beams one stream of data streams), eight streams of beamformed data can be formed at base station 420. Each mobile station can potentially receive up to 2 streams (beams) of data in this example. If each of the mobile stations 402, 404, 406, and 408 was limited to receive only a single stream (beam) of data, instead of multiple streams simultaneously, this would be multi-user beamforming (i.e., MU-BF).
  • MU-BF multi-user beamforming
  • a UE may transmit up to one CW in a subframe.
  • R1-106540 “Way Forward On Aperiodic CSI Triggering,” November 2010, which is hereby incorporated by reference into the present application as if fully set forth herein, in order to determine the modulation order, redundancy version and transport block (TB) size for the physical uplink shared channel (PUSCH), the UE first:
  • N PRB the total number of allocated physical resource blocks
  • the modulation order (Q m ) is determined as follows:
  • the modulation order is given by in Table 8.6.1-1;
  • the UE uses I MCS and Table 8.6.1-1 to determine the redundancy version (rv idx ) to use in the physical uplink shared channel.
  • DCI format 4 a new DCI format, DCI format 4, was defined in R1-106556, Change Request for 3GPP Technical Specification No. 36.212, December 2010, which is hereby incorporated by reference into the present application as if fully set forth herein.
  • DCI format 4 is used for the scheduling of the PUSCH in one UL cell with multi-antenna port transmission mode.
  • the DL cell from which the PUSCH assignments for a given UL cell originate is configured by higher layers.
  • the mapping from a carrier indicator value to a cell is UE specific and configured by higher layers.
  • the least significant bits provide the resource allocation in the UL subframe as defined in section 8.1 of R1-106557, Change Request for 3GPP Technical Specification No. 36.213, December 2010.
  • all the bits in the field provide the resource allocation in the UL subframe as defined in R1-106557, Change Request for 3GPP Technical Specification No. 36.213, December 2010.
  • DM RS demodulation reference signals
  • OCC orthogonal cover code
  • DAI Downlink Assignment Index
  • Precoding information and number of layers number of bits as specified in Table 5.3.3.1.8-1. Bit field as shown in Table 5.3.3.1.8-2 and Table 5.3.3.1.8- 3. If both transport blocks are enabled, transport block 1 is mapped to codeword 0, and transport block 2 is mapped to codeword 1. In the case in which one of the transport blocks is disabled, the transport block to codeword mapping is specified according to Table 5.3.3.1.5-2.
  • CSI channel state information
  • the aperiodic CSI request field contains 2 bits (1 bit is added to the DCI format in the UE-specific search space):
  • - “01” state indicates trigger for the downlink component carrier (DL CC) that is SIB2-linked to the uplink component carrier (UL CC) transmitting the CSI report
  • RRC radio resource control
  • the RRC can configure any combination of up to 5 component carriers.
  • UCI-only reporting (or CQI-only reporting) on a PUSCH implies that a UE maps only UCI on the PUSCH. At the same time, the UE does not map any data transport block on the PUSCH.
  • the UCI includes aperiodic CSI, rank information (RI), and Hybrid Automatic Repeat Request acknowledgement (HARQ-ACK) signaling.
  • TB disabling/enabling is used.
  • UCI-only transmission even if one TB is enabled on the PUSCH, no TBs are transmitted on the PUSCH and only UCI is transmitted.
  • a UE when a UE receives a DCI format 4 scheduling a PUSCH, the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • - the transmission rank is equal to 1;
  • the modulation and coding scheme (MCS) of an enabled TB is 29, or the RV (redundancy version) is one;
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1; and
  • the N PRB i.e., the number of physical resource blocks (PRBs) allocated for the UE, is less than or equal to 4.
  • the CSI coded bits in a UCI only reporting is modulated only with a QPSK modulation scheme.
  • the UE determines that the transmission rank is one according to the following:
  • the UE determines that the transmission rank is one if only one TB is disabled;
  • the UE determines that the transmission rank is one if only one TB is disabled.
  • the precoder information field is one of 0, 1, 2, ..., 23.
  • the number of CSI bits to be reported in the PUSCH is determined by the CSI request bit field.
  • the UE is configured with 5 component carriers (CCs), or 5 serving cells, indexed by cell 0 (or the primary cell), cell 1, ..., cell 4.
  • CCs component carriers
  • the states in the 2-bit CSI request field indicate CSI reporting methods as in Table 1 below.
  • aperiodic CSI request field values 10 and 11 are configured by an RRC signaling.
  • the aperiodic CSI request field value is 11, the UE has to report for all 5 DL CCs.
  • the number of CSI bits to be sent in the UCI-only reporting can be up to five times larger with carrier aggregation than without carrier aggregation, a method of ensuring a reliable transmission of the CSI is provided in this disclosure.
  • One method of ensuring the reliability of the CSI transmission when carrier aggregation is configured is to use a higher modulation for the CSI.
  • the coding rate for the CSI will be reduced to half of the coding rate when QPSK is used for modulating CSI bits.
  • the enabled TB index becomes 3-i. For example, if TB 1 is disabled, then TB (3-1), i.e. TB 2, is enabled.
  • the new data indicator (NDI) bit of a disabled TB is used to indicate a modulation format of CSI. For example,
  • the NDI bit of a disabled TB when only one TB is enabled, the NDI bit of a disabled TB does not convey any information. Hence, the NDI bit of a disabled TB can be used for other purposes, like indicating a modulation format of CSI.
  • MCS 31 (or RV 3) is used to indicate 16QAM.
  • MCS of the CSI in the UCI-only reporting is determined as follows:
  • RVs are used in the order of RV0, RV2 (MCS 30), RV3 (MCS 31), RV1 (MCS 29) in HARQ transmission rounds. This implies that RV1 will be used the least and RV3 will be used the second least. Therefore, using MCS 31 (or RV3) to indicate a UCI only request transmission is subject to fewer scheduling restrictions than the other MCS.
  • MCS 31 or RV3
  • the modulation format of the CSI is determined by at least one of the payload size and the number of DL CCs reported by the current CSI reporting.
  • the coding rate of the CSI is dependent on the number of CSI information bits to be transmitted in at most 4 RBs (as determined by the CSI-only reporting condition) and a modulation format.
  • the number of CSI bits is small enough, even QPSK can provide a sufficiently low coding rate to ensure a reliable transmission.
  • the number of CSI bits is large, 16QAM will be needed to keep the coding rate low.
  • a threshold number, T bits of total CSI information bits is used to determine the modulation format for the CSI in the UCI-only reporting. If the total CSI information bits to be transmitted in the current UCI-only reporting is greater than or equal to T bits , then 16QAM is used. Otherwise, QPSK is used.
  • the total number of CSI bits in the UCI only transmission is determined by both the number of DL CCs reported by the CSI report and the CSI feedback modes in the DL CCs currently being reported.
  • a threshold number e.g. T CCs , of the number of DL CCs reported by the current UCI only reporting is used to determine the modulation format for the CSI in the UCI-only reporting. If the number of DL CCs reported in the current UCI-only reporting is greater than or equal to T CCs , then 16QAM is used. Otherwise, QPSK is used.
  • the modulation format of the CSI is RRC configured.
  • the modulation format of the CSI is determined by a disabled TB index.
  • QPSK is used. Otherwise, 16QAM is used.
  • a UE when a UE receives a DCI format 4 scheduling a PUSCH, the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • - the transmission rank is equal to 1;
  • the MCS of an enabled TB is 29, or the RV (redundancy version) is one;
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1; and
  • the N PRB i.e., the number of PRBs allocated for the UE, is less than or equal to the threshold number of PRBs, i.e., T PRB .
  • the UE determines that the transmission rank is one according to the following:
  • the UE determines that the transmission rank is one if only one TB is disabled;
  • the UE determines that the transmission rank is one if only one TB is disabled and at the same time the precoder information field is one of 0, 1, 2, ..., 23.
  • the CSI coding rate can be decreased, which will be useful to ensure a reliable transmission of the CSI in the case of carrier aggregation.
  • T PRB 8
  • the enabled TB index becomes 3-i. For example, if TB 1 is disabled, TB (3-1), i.e., TB 2 is enabled.
  • the NDI bit of a disabled TB is used to indicate the threshold number of PRBs, i.e., the T PRB .
  • the T PRB the threshold number of PRBs
  • T PRB the threshold number of PRBs, T PRB , in the UCI-only reporting is determined as follows:
  • the threshold number of PRBs, T PRB is determined by at least one of the payload size and the number of DL CCs reported in the current CSI reporting.
  • T CCs is 2.
  • the threshold number of PRBs, T PRB is RRC configured.
  • the threshold number of PRBs, T PRB is determined by a disabled TB index as indicated by the table below.
  • QPSK For example, if TB1 is disabled, then QPSK is used. Otherwise, 16QAM is used.
  • a UE when a UE receives a DCI format 4 scheduling a PUSCH, the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • - the transmission rank is equal to 1;
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1; and
  • the N PRB i.e., the number of PRBs allocated for the UE, is less than or equal to T PRB .
  • the modulation format used for CSI modulation can be determined by any of the embodiments provided in this disclosure, and the T PRB can be determined by any of the embodiments provided in this disclosure.
  • CSI modulation format is indicated by the NDI bit of the disabled TB, while the T PRB is determined by a disabled TB index as shown in the following tables:
  • the CSI modulation format and the T PRB are jointly indicated by one codepoint, e.g., the NDI of a disabled TB, as shown in the following tables:
  • the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • RV redundancy version
  • the CSI request field is non-zero. If carrier aggregation is configured and the DCI is transmitted in a UE-specific search space, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured or if the DCI is transmitted in a cell-specific search space, this implies that CSI request field is 1; and
  • the N PRB i.e., the number of PRBs allocated for the UE, is less than or equal to T PRB .
  • the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • - the transmission rank is equal to 1;
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1; and
  • the NDI bit of a disabled TB when only one CW is enabled, the NDI bit of a disabled TB does not convey any information. Hence, the NDI bit of a disabled TB can be used for other purposes, such as indicating the UCI-only transmission. In a sense, this method is a simpler method than the other embodiments, as the number of conditions to be met for determining a UCI-only transmission is smaller. Another benefit is that the UCI-only transmission is no longer limited within a PUSCH with a small number of RB allocation (e.g., up to 4 RBs).
  • the enabled TB index becomes 3-i.
  • the UE determines that the transmission rank is one according to the following:
  • the UE determines that the transmission rank is one if only one TB is disabled;
  • the UE determines that the transmission rank is one if only one TB is disabled and at the same time the precoder information field is one of 0, 1, 2, ..., 23.
  • any of the embodiments provided in this disclosure may be used. Furthermore, the embodiments described below may be used to indicate the modulation format.
  • the MCS field of the enabled TB indicates a modulation format for the CSI in the UCI-only transmission.
  • the modulation order of the CSI is determined as in the following table:
  • the modulation order of the CSI is determined by the modulation order indicated by the MCS field to Table 8.6.1-1 in R1-106557, Change Request for 3GPP Technical Specification No. 36.213, December 2010.
  • the modulation order of the CSI is determined as in the following table:
  • one bit of the 5-bit MCS field of the enabled TB indicates the modulation order. If the most significant bit (MSB) of the 5-bit MCS field of the enabled TB is used for indicating the modulation order, the following table is used:
  • the MCS field of the enabled TB may be used to jointly indicate the UCI contents to be reported in the current UCI-only reporting and the modulation format.
  • UCI contents include the number and the identities of the DL CCs (or serving cells) reported in the current UCI-only reporting, how many HARQ-ACK bits and how many RI bits should be piggybacked in the current UCI-only reporting, and so on.
  • the MCS field of the enabled TB indicates the UCI contents and the modulation order as in the following:
  • one bit of the 5-bit MCS field of the enabled TB indicates the modulation order
  • another bit of the 5-bit MCS field of the enabled TB indicates the UCI contents. If the MSB of the 5-bit MCS field of the enabled TB is used for indicating the modulation order and the 2nd MSB of the 5-bit MCS field of the enabled TB is used for indicating the UCI contents, the following table for the modulation order indication is used:
  • the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • - the transmission rank is equal to 1;
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1;
  • the N PRB i.e., the number of PRBs allocated for the UE, is less than or equal to T PRB .
  • the NDI bit of a disabled TB when only one CW is enabled, the NDI bit of a disabled TB does not convey any information. Hence, the NDI bit of a disabled TB can be used for other purposes, like indicating the UCI-only transmission. In a sense, this method is a simpler method than the other embodiments, as the number of conditions to be met for finding out a UCI-only transmission is smaller. Another benefit is that the UCI-only transmission is no longer limited within a PUSCH with a small number of RB allocation (e.g., up to 4 RBs).
  • the enabled TB index becomes 3-i.
  • the NDI of the disabled TB will indicate a state as in the following table:
  • the UE determines that the transmission rank is one according to the following:
  • the UE determines that the transmission rank is one if only one TB is disabled;
  • the UE determines that the transmission rank is one if only one TB is disabled and at the same time the precoder information field is one of 0, 1, 2, ..., 23.
  • any of the above described embodiments may be used.
  • the MCS field of the enabled TB may be used to jointly indicate the UCI contents reported in the current UCI-only reporting, the modulation format and the threshold number of PRBs, i.e., T PRB .
  • the UCI contents include the number and the identities of the DL CCs (or serving cells) to be reported in the current UCI-only reporting, how many HARQ-ACK bits and how many RI bits should be piggybacked in the current UCI-only reporting, and so on.
  • the MCS field of the enabled TB indicates UCI contents as in the following:
  • one bit of the 5-bit MCS field of the enabled TB indicates the modulation order
  • another bit of the 5-bit MCS field of the enabled TB indicates the UCI contents
  • a still other bit of the 5-bit MCS field of the enabled TB indicates the threshold number of PRBs T PRB . If the MSB of the 5-bit MCS field of the enabled TB is used for indicating the modulation order, the 2nd MSB of the 5-bit MCS field of the enabled TB is used for indicating the UCI contents, and the 3rd MSB of the 5-bit MCS field of the enabled TB is used for indicating threshold number of PRBs T PRB , then the following table is used for the modulation order indication:
  • a UE when a UE receives a DCI format 4 scheduling a PUSCH, the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1.
  • one CW (e.g., CW0) is enabled to carry UCI on the enabled CW even if both TBs are disabled.
  • the UE reads a column for one enabled CW in the transmitted precoding matrix indicator (TPMI) tables 5.3.3.1.8-2 and 5.3.3.1.8-3 in R1-106557, Change Request for 3GPP Technical Specification No. 36.213, December 2010, for example, to determine a TPMI from the precoder information field.
  • TPMI transmitted precoding matrix indicator
  • the modulation format used for CSI modulation can be determined by any of the embodiments provided in this disclosure, and the T PRB can be determined by any of the embodiments provided in this disclosure.
  • both NDI bits do not convey any information.
  • one NDI bit can be used to indicate the CSI modulation format.
  • NDI1 indicate the CSI modulation format as follows:
  • a UE when a UE receives a DCI format 4 scheduling a PUSCH, the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • the transmission rank is one
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1.
  • one CW (e.g., CW0) is enabled to carry UCI on the enabled CW even if both TBs are disabled.
  • the UE reads a column for one enabled CW in the transmitted precoding matrix indicator (TPMI) tables 5.3.3.1.8-2 and 5.3.3.1.8-3 in R1-106557, Change Request for 3GPP Technical Specification No. 36.213, December 2010, for example, to determine a TPMI from the precoder information field.
  • TPMI transmitted precoding matrix indicator
  • the UE determines that the transmission rank is one according to the following:
  • the UE determines that the transmission rank is one if only one TB is disabled;
  • the UE determines that the transmission rank is one if only one TB is disabled and at the same time the precoder information field is one of 0, 1, 2, ..., 23.
  • a UE when a UE receives a DCI format 4 scheduling a PUSCH, the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1; and
  • the N PRB i.e., the number of PRBs allocated for the UE, is less than or equal to T PRB .
  • one CW (e.g., CW0) is enabled to carry UCI on the enabled CW even if both TBs are disabled.
  • the UE reads a column for one enabled CW in the transmitted precoding matrix indicator (TPMI) tables 5.3.3.1.8-2 and 5.3.3.1.8-3 in R1-106557, Change Request for 3GPP Technical Specification No. 36.213, December 2010, for example, to determine a TPMI from the precoder information field.
  • TPMI transmitted precoding matrix indicator
  • the modulation format used for the CSI modulation can be determined by any of the embodiments provided in this disclosure, and the T PRB can be determined by any of the embodiments provided in this disclosure.
  • both NDI bits do not convey any information.
  • one NDI bit can be used to indicate the CSI modulation format, while the other NDI bit can be used to indicate the threshold number of RBs.
  • NDI1 indicates the CSI modulation format as follows:
  • NDI2 indicates the threshold number of PRBs as follows:
  • the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • the MCS of TB2 i.e., the MCS of the enabled TB
  • the RV(redundancy version) is one
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1; and
  • the N PRB i.e., the number of PRBs allocated for the UE, is less than or equal to 4.
  • the UE determines that the transmission rank is one according to the following:
  • the UE determines that the transmission rank is one if only one TB is disabled;
  • the UE determines that the transmission rank is one, if only one TB is disabled and at the same time the precoder information field is one of 0, 1, 2, ..., 23.
  • the modulation format used for the CSI modulation can be determined by any of the embodiments provided in this disclosure, and the T PRB can be determined by of the embodiments provided in this disclosure.
  • a UE when a UE receives a DCI format 4 scheduling a PUSCH, the UE determines UCI-only reporting if the following set of conditions are satisfied:
  • the MCS of TB1 i.e., MCS of the enabled TB
  • RV(redundancy version) is one
  • the CSI request field is non-zero. If carrier aggregation is configured, this implies that CSI request field is 01, 10 or 11. If carrier aggregation is not configured, this implies that CSI request field is 1; and
  • the N PRB i.e., the number of PRBs allocated for the UE, is less than or equal to 4.
  • the UE determines that the transmission rank is one according to the following:
  • the UE determines that the transmission rank is one if only one TB is disabled;
  • the UE determines that the transmission rank is one if only one TB is disabled and at the same time the precoder information field is one of 0, 1, 2, ..., 23.
  • the modulation format used for the CSI modulation can be determined by any of the embodiments provided in this disclosure, and the T PRB can be determined by any of the embodiments provided in this disclosure.
  • the modulation format of the CSI in UCI-only transmission is determined by which DCI format triggers a UCI only transmission. For example, when DCI format 0/0A triggers UCI-only transmission, QPSK is used for the modulation format of the UCI. When DCI format 4 triggers UCI-only transmission, 16QAM is used for the modulation format of UCI as shown in the following table:
  • CQI/PMI is mapped/allocated onto a subset of the Ns layers being transmitted on the uplink in a MIMO uplink subframe.
  • the size of the subset, Ns could be less than or equal to the total number of layers, which is denoted by N.
  • UCI UL control information
  • the initial-transmission MCSs and for the two TBs (CWs) are determined according to the following procedure:
  • the UE reads the MCS1 in DCI 0B. If TB1 is to be transmitted for the first time, i.e., if , then the UE sets the initial-transmission MCS for TB1, . Otherwise, i.e., if , then the UE determines the initial-transmission MCS for TB1, , from the DCI transported in the latest PDCCH for TB1 using .
  • the UE reads the MCS2 in DCI 0B. If TB2 is to be transmitted for the first time, i.e., , then the UE sets the initial-transmission MCS for TB2, . Otherwise, i.e., if , then the UE determines the initial-transmission MCS for TB2, , from the DCI transported in the latest PDCCH for TB2 using .
  • the UCI is mapped onto the layers of that CW.
  • the UCI is mapped onto the layers of the CW with the higher initial MCS value.
  • Method 1 the UE always maps the UCI on CW0 (codeword0, or the first codeword), which is mapped to either layer 0 or layers 0 and 1, according to the CW to layer mapping table, and transmission rank.
  • CW0 codeword0, or the first codeword
  • Method 2 the UE always maps the UCI on CW1 (codeword1, or the second codeword).
  • Method 3 the UE maps the UCI on CW1 (the second codeword) for the case of rank 3 (3 layers) transmission, and maps UCI on CW0 for other rank transmissions.
  • the reason for the special treatment for rank 3 is that in rank3, CW0 is mapped to layer0, and CW1 is mapped to layers 1 and 2. Therefore, it may be better to map UCI to the CW with 2-layer transmission since this provides more resources for UCI transmission.
  • the UE When a CQI-only request is signaled to a UE, the UE does not transmit TB for the UL-SCH in a CW that will carry CQI/PMI, and the UE transmits only UCI (without UL data) in the CW.
  • DCI format 0B includes the following IEs:
  • the number of CQI/PMI information bits to be transmitted in a subframe can be significantly larger than that of Rel-8/9 LTE, when carrier aggregation and enhanced MIMO CQI/PMI feedback are considered.
  • carrier aggregation and enhanced MIMO CQI/PMI feedback are considered.
  • two options can be considered.
  • Option 1 Allow higher-order modulations for UCI-only transmissions.
  • Option 2 Allow multi-CW transmissions for UCI-only transmissions.
  • CQI-only request in LTE-A is indicated to a UE when IEs in DCI 0B intended for the UE satisfy the following three conditions:
  • At least one MCS IE is 29 (i.e., either or or both ),
  • the number of information bits carried in a CQI report can depend on the number of DL CCs reported by the CQI report.
  • the threshold number of the PRBs, T PRB indicating the CQI-only report may need to be adapted according to the number of DL CCs.
  • a number of coded bits in a CQI only report depend on a modulation order and a number of layers used for the CQI-only report.
  • the threshold number of the PRBs, T PRB , in Condition 3 is defined as a function of at least one of a number of DL CCs reported by a CQI report, N DLCC , a modulation order Qm ⁇ ⁇ 2,4,6, ⁇ and a number of layers on which a CQI report is transmitted, L CQI .
  • T PRB 4N DLCC /(Q m /2)/L CQI ,
  • T PRB 4N DLCC
  • T PRB 4N DLCC /(Q m /2), and
  • T PRB 4N DLCC /L CQI .
  • the following describes methods of indicating a CW to transmit CQI to a UE in case of 2 CW transmissions.
  • the UE determines the initial-transmission MCS and for the two TBs (CWs) according to the procedure described in embodiment 1:
  • a CW to carry CQI/PMI is determined by comparing the two MCSs used for the initial transmission of the two TBs (or the two CWs). When the two MCSs are different, a CW having a higher initial-transmission MCS carries the CQI/PMI. When the two MCSs are the same, CW0 carries the CQI/PMI. This operation can be done at the UE as in the following:
  • TB1 is transmitted in CW1 and TB2 is transmitted in CW0. If , then CQI/PMI is transmitted in CW0. If , then CQI/PMI is transmitted in CW1.
  • a CW to carry CQI/PMI is determined depending on whether at least one of and is 29 or not.
  • CQI/PMI is transmitted in a CW with a higher initial-transmission MCS.
  • the CQI/PMI is transmitted in a CW having MCS IE index 29.
  • CQI/PMI is transmitted in one fixed CW, e.g., CW0.
  • RV redundancy version
  • Option 2 CQI/PMI is transmitted in both CWs, where CQI/PMI information bits are separately encoded and mapped for the two CWs.
  • Option 3 CQI/PMI is transmitted in both CWs, where CQI/PMI modulation symbols are split into the layers of the two CWs.
  • Option 1 immediately above is used as an example to illustrate how this modulation format is indicated by DCI format 0B.
  • the modulation order of the CQI/PMI is determined by the CSI IE of the DCI format. If the CSI value belongs to subset 1, one modulation order is indicated. If the CIS value belongs to subset 2, another modulation order is indicated for Option 1 immediately above, for example, as shown in the table below:
  • the modulation order of the CQI/PMI is determined by the following rules:
  • DCI format 0B indicates that only 1TB (CW) is enabled (although no data TB is transmitted, and only UCI is transmitted in this CW), the NDI bit of the enabled TB is used to indicate the modulation format of CQI/PMI.
  • the NDI of the 1st TB is always used to indicate modulation format of CQI/PMI.
  • the NDI of the 2nd TB is always used to indicate the modulation format of CQI/PMI.
  • NDI1 (NDI of TB1) indicates the modulation order as shown below:
  • NDI2 (NDI of TB2) indicates the modulation order as shown below:
  • NDI2 indicates the modulation order.
  • NDI1 indicates the modulation order.
  • this disclosure provides two options of determining the modulation order:
  • Option 1 always use QPSK
  • Option 2 use the NDI bit to indicate the modulation format, similar to the method proposed above for format 0B.
  • the modulation order of the CQI/PMI is jointly determined by the CSI IE of the DCI format and the one selected NDI bit.
  • CQI-only request in LTE-A is indicated to a UE when IEs in DCI 0B intended for the UE satisfy the following three conditions (assuming CQI is always transmitted on CW 0):
  • this MCS can be associated with either TB1 or TB2 in the case in which 1 TB (CW) is enabled, and
  • this MCS is associated with TB1 in the case in which 2 TBs (2 CWs) are enabled assuming no swap bit. Otherwise, both TBs are possible.
  • CQI-only request in LTE-A is indicated to a UE when IEs in DCI 0B intended for the UE satisfy the following three conditions:
  • Condition 1 If only 1 TB (CW) is enabled, the MCS associated with CW0 is 29. If 2 TBs (CWs) are enabled, the MCS associated with CW1 is 29.
  • FIGURE 6 illustrates a method 600 of operating a base station according to an embodiment of this disclosure.
  • method 600 includes transmitting an uplink grant in a downlink control information (DCI) format to a subscriber station (block 601).
  • Method 600 also includes receiving only uplink control information (UCI) on a physical uplink shared channel (PUSCH) from the subscriber station when the uplink grant includes a modulation and coding scheme (MCS) of an enabled transport block (TB) with a value of 29, or a redundancy version of the PUSCH with a value of 1; a channel state information (CSI) request field with a non-zero value; and a total number of physical resource blocks allocated for the subscriber station, N PRB , with a value less than or equal to a threshold number of physical resource blocks, T PRB .
  • MCS modulation and coding scheme
  • CSI channel state information
  • T PRB is based at least partly upon one of a total number of CSI information bits to be transmitted on the PUSCH, N total , and a number of downlink component carriers (DL CCs) reported in a current CSI reporting, N CCs (block 603).
  • N total a total number of CSI information bits to be transmitted on the PUSCH
  • DL CCs downlink component carriers
  • the uplink grant when the DCI format is DCI format 4, the uplink grant further includes a transmission rank of the UCI information with a value of 1 when receiving only UCI on the PUSCH from the subscriber station.
  • FIGURE 7 illustrates a method 700 of operating a subscriber station according to an embodiment of this disclosure.
  • method 700 includes receiving an uplink grant in a downlink control information (DCI) format 4 from a base station (block 701).
  • Method 700 also includes transmitting only uplink control information (UCI) on a physical uplink shared channel (PUSCH) to the base station when the uplink grant includes a modulation and coding scheme (MCS) of an enabled transport block (TB) with a value of 29, or a redundancy version of the PUSCH with a value of 1; a channel state information (CSI) request field with a non-zero value; and a total number of physical resource blocks allocated for the subscriber station, N PRB , with a value less than or equal to a threshold number of physical resource blocks, T PRB .
  • MCS modulation and coding scheme
  • CSI channel state information
  • T PRB is based at least partly upon one of a total number of CSI information bits to be transmitted on the PUSCH, N total , and a number of downlink component carriers (DL CCs) reported in a current CSI reporting, N CCs (block 703).
  • N total a total number of CSI information bits to be transmitted on the PUSCH
  • DL CCs downlink component carriers
  • the uplink grant when the DCI format is DCI format 4, the uplink grant further includes a transmission rank of the UCI information with a value of 1 when transmitting only UCI on the PUSCH from the subscriber station.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
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CN201180027314.5A CN102934381B (zh) 2010-06-02 2011-06-02 无线通信系统中用于发送信道状态信息的方法和系统
EP22167321.3A EP4047847A1 (en) 2010-06-02 2011-06-02 Method and system for transmitting channel state information in wireless communication systems
JP2013513113A JP5781605B2 (ja) 2010-06-02 2011-06-02 無線通信システムにおいてチャネル情報を送信するための方法及びシステム

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US8971261B2 (en) 2015-03-03
KR20130083391A (ko) 2013-07-22
JP2013527729A (ja) 2013-06-27
WO2011152673A3 (en) 2012-04-26
US20110299484A1 (en) 2011-12-08
EP2577897A2 (en) 2013-04-10
US20150172028A1 (en) 2015-06-18
KR101852854B1 (ko) 2018-04-27
US9270439B2 (en) 2016-02-23
EP2577897B1 (en) 2022-09-07
CN102934381A (zh) 2013-02-13
EP2577897A4 (en) 2017-01-04
JP5781605B2 (ja) 2015-09-24
CN102934381B (zh) 2016-04-06
EP4047847A1 (en) 2022-08-24

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