Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/26—Systems using multi-frequency codes
  • H04L27/2601—Multicarrier modulation systems
  • H04L27/2602—Signal structure
  • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
  • H04L27/2607—Cyclic extensions
• • 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
• • 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
  • H04L1/1607—Details of the supervisory signal
  • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
• • 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
  • H04L1/1829—Arrangements specially adapted for the receiver end
  • H04L1/1854—Scheduling and prioritising arrangements
• • 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
  • H04L1/1829—Arrangements specially adapted for the receiver end
  • H04L1/1861—Physical mapping arrangements
• • 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
  • H04L1/1893—Physical mapping arrangements
• • 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
  • 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
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
• • 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
  • H04L5/0001—Arrangements for dividing the transmission path
  • H04L5/0003—Two-dimensional division
  • H04L5/0005—Time-frequency
  • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
• • 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
  • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
• • 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
  • H04L5/0055—Physical resource allocation for ACK/NACK
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

• the present invention relates to a method and a apparatus for physical uplink transmission for 3GPP long term evolution (LTE), and more specifically, to a method and a apparatus generally adept at remapping physical uplink control channels for both of a resource block containing acknowledgement and non-acknowledgement (ACK/NAK) channel and a mixed resource block containing the ACK/NAK channels and channel quality indication (CQI) channels.
• LTE long term evolution
• ACK/NAK acknowledgement and non-acknowledgement
• CQI channel quality indication
• Orthogonal Frequency Division Multiplexing is a popular wireless communication technology for multiplexing data in the frequency domain.
• OFDM Orthogonal Frequency Division Multiplexing
• the total bandwidth in an Orthogonal frequency-division multiplexing (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.
• N the FFT/IFFT size
• the number of subcarriers used for data transmission is less than N because some of the subcarriers at the edge of the frequency spectrum are reserved as guard subcarriers, and generally no information is transmitted on these guard subcarriers.
• the Third Generation Partnership Project Long Term evolution (3GPP LTE) is a project within the Third Generation Partnership Project to improve the Universal Mobile Telecommunications System mobile phone standard to cope with future requirements.
• 3GPP LTE Long term evolution
• one type of the resources used for transmitting the uplink control channel (PUCCH) is known as a cyclic shift (CS) for each OFDM symbol.
• CS cyclic shift
• One of important aspects of the system design is resource remapping on either a symbol, slot or subframe-level.
• a method for transmitting physical uplink channel signals contemplates allocating a cyclic shift and an orthogonal cover to physical uplink control channels; and remapping the transmission resources in a slot-level in accordance with a selected remapping scheme, with:
• the remapped resource indices within a first slot in the two slots of a subframe to which the physical uplink channel symbols are mapped being established by:
• the remapped resource indices within a second slot in the two slots of a subframe to which the physical uplink channel symbols are mapped being established by: where: and di and d 2 are a pair of two independent predetermined parameters, is the resource index before remapping, and is the number of subcarriers in one resource block; and transmitting the physical uplink
• a method for transmitting physical uplink channel signals contemplates a method for transmitting physical uplink channel signals, contemplates allocating a cyclic shift and an orthogonal cover to physical uplink control channels; and remapping the transmission resources in a slot-level in accordance with a selected remapping scheme, with:
• the remapped resource indices within a first slot in the two slots of a subframe to which the physical uplink channel symbols are mapped being established by: . and ' when , the remapped resource indices within a second slot in the two slots of a subframe to which the physical uplink channel symbols are mapped being established by:
• a method for transmitting physical uplink channel signals contemplates a method for transmitting physical uplink channel signals, contemplates allocating a cyclic shift and an orthogonal cover to physical uplink control channels; and remapping the transmission resources in a slot-level in accordance with a selected remapping scheme, with:
• the remapped resource indices within a first slot in the two slots of a subframe to which the physical uplink channel symbols are mapped being established by:
• the remapped resource indices within a second slot in the two slots of a subframe to which the physical uplink channel symbols are mapped being established by: where: and d 3 and d 4 are a first pair of two independent predetermined parameters, and e 3 and e 4 are a second pair of two independent predetermined parameters,
• PUCCH is the resource index before remapping
• a method for transmitting physical uplink channel signals comprising the steps of allocating a cyclic shift and an orthogonal cover to physical uplink control channels; remapping in a slot-level, the physical uplink control channels into two resource blocks respectively located at two slots of a subframe, with: when ; resource indices of the physical uplink control channels within a first slot in the two slots of the subframe are established by:
• FIG. 1 is a block diagram of a simplified example of data transmission and reception using Orthogonal Frequency Division Multiplexing (OFDM);
• OFDM Orthogonal Frequency Division Multiplexing
• FIG. 2 is a block diagram of a simplified example of data transmission, data reception and signal processing stages using Orthogonal Frequency Division Multiplexing (OFDM);
• OFDM Orthogonal Frequency Division Multiplexing
• Figure 3 is an illustration showing an example of multiplexing six units of user equipment into one resource block containing channel quality indication signals within one slot;
• Figure 4 is a block diagram illustrating the scenario for the transmission of physical uplink acknowledgement and non-acknowledgement channels and reference signals for acknowledgement and non-acknowledgement demodulation;
• Figure 5 is a flow chart illustrating a transmitting method of physical uplink channel signals in accordance with the embodiments of the present invention.
• FIG. 1 A simplified example of data transmission/reception using Orthogonal Frequency Division Multiplexing (OFDM) is shown in Figure 1.
• OFDM Orthogonal Frequency Division Multiplexing
• the input data to be transmitted is modulated by a quadrature amplitude modulation (QAM) modulator 1 1 1.
• the QAM modulation symbols are serial-to- parallel converted by a serial-to-parallel converter 113 and input to an inverse fast Fourier transform (IFFT) unit 1 15.
• IFFT inverse fast Fourier transform
• N time-domain samples are obtained.
• N refers to the sampling number of IFFT/FFT used by the OFDM system.
• the signal transmitted from IFFT unit 1 15 is parallel-to-serial converted by a parallel-to-serial convertor 1 17 and a cyclic prefix (CP) 1 19 is added to the signal sequence.
• the resulting sequence of samples is referred to as the OFDM symbol.
• Serial to parallel convertor 1 13 uses shift registers to convert data from serial form to parallel form. Data is loaded into the shift registers in a serial load mode, and is then shifted parallel in a shift mode with a clock signal.
• the cyclic prefix is firstly removed at cyclic prefix remover 121 and the signal is serial-to-parallel converted by serial-to-parallel convertor 123 before feeding the converted parallel signal into fast Fourier transform (FFT) transformer 125.
• FFT fast Fourier transform
• Output of FFT transformer 125 is parallel-to-serial converted by parallel-to-serial convertor 128 and the resulting symbols are input to QAM demodulator 129.
• Parallel-to-serial convertor 128 uses shift registers to convert data from parallel fonn to serial form. Data is loaded into the shift registers in a parallel load mode, and is then shifted serially in a shift mode with a clock signal.
• the total bandwidth in an OFDM system is divided into narrowband frequency units called subca ⁇ iers.
• the number of subcarriers is equal to the FFT/IFFT size N.
• the number of subcarriers used for data is less than N because some of the subcarriers at the edge of the frequency spectrum are reserved as guard subcarriers, and no information is transmitted on guard subcarriers.
• FIG. 2 is a block diagram of a simplified example of data transmission, data reception and signal processing stages using Orthogonal Frequency Division Multiplexing (OFDM).
• serial-to-parallel convertor 1 13 and IFFT unit 1 15 map the converted parallel signal into one resource block and transform a frequency domain representation of the converted parallel signal to a time domain representation.
• the OFDM symbols output from cyclic prefix (CP) 119 are further processed by signal processing unit_Tx 120 before being transmitted by the transmitting antennas.
• the processed OFDM symbols transmitted from the transmitter are firstly processed by signal processing unit Rx 122 before received by the receiving antennas.
• Signal processing unit_Tx 120 and signal processing unit_Rx 122 perform signal processing respectively for the transmitter and the receiver in accordance with certain signal processing schemes.
• PUCCH uplink control channel
• CS cyclic shift
• PUCCHs are defined as channels carrying control signals in the uplink, and PUCCHs may carry control information, e.g., channel quality indication (CQI), ACK/NACK, hybrid automatic repeat requests (HARQ) and uplink scheduling requests.
• CQI channel quality indication
• ACK/NACK ACK/NACK
• HARQ hybrid automatic repeat requests
• the physical uplink control channel carries uplink control information. All PUCCH formats use a cyclic shift (CS) of a sequence in each OFDM symbol.
• Figure 3 is an illustration showing an example of multiplexing six user equipments (UEs) into one resource block containing channel quality indication (CQI) signals within one slot.
• the PUCCH occupies twelve subcarriers in the resource block and twelve cyclic shift resources (co through Ci i) exist in the resource block.
• the CQI signals include both of CQI data signals (e.g., CQI data signal 201) occupying several symbol elements (e.g., so) within the OFDM symbols and CQI reference signals (e.g., CQI reference signal 202) occupying several symbol elements (e.g., Si).
• CQI data signals e.g., CQI data signal 201
• CQI reference signals e.g., CQI reference signal 202
• occupying several symbol elements e.g., Si.
• Six UEs i.e., UE 1 through UE 6 are multiplexed in the resource block. Here, only six out of twelve cyclic shifts are actually used.
• Figure 4, cited from reference [3] shows the working assumption on the transmission block of uplink ACK/NAK channels and reference signals. Here, the position of the reference signal long block is not determined, therefore, Figure 4 is only for illustrative purposes.
• Serial- to-parallel convertor 1 13 and IFFT unit 115 transform a frequency domain representation of the ACK/NAK signals and the uplink reference signals to a time domain representation, and map the ACK/NAK signals and the uplink reference signals into the transmission block.
• ACK/NAK signals and the uplink reference signals (UL RS) for ACK/NAK demodulation are multiplexed on code channels 301 constructed by both a cyclic shift of a base sequence (e.g., Zadoff-Chu sequence) and an orthogonal cover.
• ACK/NAK signals and the uplink reference signals are multiplexed on code channels 301 constructed by both of a Zadoff-Chu sequence ZC(u, ⁇ ) and an orthogonal cover.
• a Zadoff-Chu sequence ZC(u, ⁇ ) with a particular cyclic shift r , ZC(u, ⁇ ) is placed in sub-carriers and an orthogonal cover is applied to time domain long block (LB).
• the IFFTs transform a frequency domain representation of the input sequence to a time domain representation.
• the orthogonal cover may be used for both of UL RS and for PUCCH data, the actual code of the orthogonal cover used only for UL RS is different from ⁇ wo, which is used only for PUCCH data.
• Figure 3 shows an example of a mapping method exclusively adapted to resource blocks only containing CQI channels
• Figure 4 shows an example of a mapping method for ACK/NAK channels.
• the physical resources used for PUCCH depends on two parameters, and , given by higher layers.
• the variable denotes the bandwidth in terms of resource blocks that are
• variable denotes the number of cyclic shift used for PUCCH formats 1/la/lb in a resource block used for
• PUCCH format 1 information is carried by the presence/absence of transmission of
• PUCCH from the UE. In the remainder of this section, shall be assumed for PUCCH format 1.
• PUCCH formats Ia and Ib For PUCCH formats Ia and Ib, one or two explicit bits are transmitted, respectively.
• the block of bits shall be modulated as described in section 7.1, resulting in a complex-valued symbol .
• the modulation schemes for the different PUCCH formats are given by Table 5.4-1.
• the complex-valued symbol d(0) shall be multiplied with a cyclically shifted length sequence according to:
• Resources used for transmission of PUCCH format 1, Ia and Ib are identified by a resource index from which the orthogonal sequence index and the cyclic shift are determined according to:
• N' being the number of cyclic shifts and c being the number of orthogonal covers.
• novel slot-level remapping methods are proposed to provide a better intra-cell randomization, especially for ACK/NAK resource blocks with extended cyclic prefix, and for normal cyclic prefix cases with mixed resource block where the ACK/NAK and
• Equations (8) and (9) are referred by the present invention.
• FIG. 5 is a flow chart illustrating a mapping and transmitting method of physical uplink channel signals in accordance with the embodiments of the present invention.
• transmitter allocates a cyclic shift and an orthogonal cover to physical uplink control channels using allocating section; in step 703, transmitter maps in a slot-level, the physical uplink control channels into two resource blocks respectively located at two slots of a subframe using remapper section; and in step 705, transmitter transmits the mapped physical uplink control channels using transmitting antenna unit.
• the present invention introduces novel remapping methods for performing step 703.
• a slot-level remapping method (C) is proposed.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by:
• resource indices of the physical uplink control channels within a first slot of the two slots of the subframe are established by:
• n s is a slot index within a subframe, is a resource index for physical uplink control channel format 1, 1a and Ib, is a number of cyclic shifts used for the physical uplink control channel format 1, 1a and Ib in the resource block, and is a resource block size in the frequency domain.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by: when , the resource indices of the physical uplink control channels within a first slot of the two slots of the subframe to which the physical uplink channel symbols are remapped by:
• the resource indices of the physical uplink control channels within a second slot of the two slots of the subframe to which the physical uplink channel symbols are remapped by:
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped may be also given by: when , the resource indices of the physical uplink control channels within the first slot of the two slots of the subframe to which the physical uplink channel symbols are remapped by:
• Method D has been accepted by 3GPP standards presented by document TSG RAN WGl #53b Rl-082660 developed at meeting held in Warsaw, Poland, from June 30, 2008 through July 4, 2008. On page 2 of Rl-082660, it is stated that:
• equation (16) is rewritten to: for , where A while the contents of equation (16) are not altered.
• a slot-level remapping method (E) is proposed.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by:
• WIt being a pair of two independent parameters
• 3 ' 4 being another pair of two independent parameters.
• One example of the parameter pair Another example of the parameter pair .
• the proposed method C may be generally adapted to a complex 3GPP LTE physical uplink where ACK/NAK resource blocks may be applied by the extended cyclic prefix, mixed resource blocks (where the ACK/NAK and CQl channels coexist) may be applied by the normal cyclic prefix, or mixed resource blocks (where the ACK/NAK and CQI channels coexist) may be applied by the extended cyclic prefix.
• Examples One through Six of Method C are on the assumption that the parameter pair
• Table 1 shows the example of CS/OC sequence remapping, where and an extended cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by Table 1.
• Table 2 shows the example of CS/OC sequence remapping, where and an extended cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by Table 2.
• ACK/NAK channels and CQI channels are carried by the resource block and the extended cyclic prefix is applied.
• ; and thus and ) are achieved as .
• Table 3 shows the example of CS/OC sequence remapping, where and an extended cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by Table 3.
• ACK/NAK channels and CQI channels are carried by the resource block and the extended cyclic prefix is applied.
• Table 4 shows the example of CS/OC sequence remapping, where and an extended cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a sub frame to which the PUCCH is mapped are given by Table 4.
• ACK/NAK channels and CQI channels are carried by the resource block and the normal cyclic prefix is applied.
• Table 5 shows the example of CS/OC sequence remapping, where and a normal cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by Table 5.
• ACK/NAK channels and CQI channels are carried by the resource block and the normal cyclic prefix is applied.
• Table 6 shows the example of CS/OC sequence remapping, where and a normal cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by Table 6.
• the proposed method D may be generally adapted to a complex 3GPP LTE physical uplink where ACK/NAK resource blocks may be applied by the extended cyclic prefix, mixed resource blocks (where the ACK/NAK and CQI channels coexist) may be applied by the normal cyclic prefix, or mixed resource blocks (where the ACK/NAK and CQI channels coexist) may be applied by the extended cyclic prefix.
• Examples of Method D are on the assumption that normal CP are used and normal CP parameter Example Seven
• ACK/NAK channels and CQI channels are carried by the resource block and the normal cyclic prefix is applied.
• Table 7 shows the example of CS/OC sequence remapping, where J '" y ' " and a normal cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by Table 7.
• ACK/NAK channels and CQI channels are carried by the resource block and the normal cyclic prefix is applied.
• Table 8 shows the example of CS/OC sequence remapping, where and a normal cyclic prefix is applied.
• the resource indices within the two resource blocks respectively in the two slots of a subframe to which the PUCCH is mapped are given by Table 8.

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