Classifications

• • 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
  • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
  • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
• • 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
  • H04L1/0028—Formatting
  • H04L1/0031—Multiple signaling transmission
• • 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
  • H04L1/1607—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
  • H04L1/1861—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
  • H04L1/0001—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
  • 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 signaling, i.e. of overhead other than pilot signals

Definitions

• the present invention relates to the field of wireless communications, and in particular, to a method and apparatus for transmitting uplink control information, and more particularly to a method and apparatus for transmitting uplink control information on a physical uplink shared channel of a plurality of codewords. Background technique
• the terminal in order to support dynamic scheduling, downlink MIMO (Multiple Input Multiple Output) transmission, and hybrid automatic retransmission, the terminal needs to pass PUCCH (Physical).
• the UCI that is fed back through the PUSCH includes: CQI (Channel Quality Information), RI (Rank Indication), and HARQ-ACK (Hybrid Automatic Repeat Request-Acknowledgment). information).
• the CQI includes channel quality indication and coding matrix indication information when the MIMO transmission mode is closed loop spatial division multiplexing and MU-MIMO (multi-user MIMO), and the channel quality indication information is used in other transmission modes.
• the PUSCH supports only one codeword in a TTI (Transmission Time Interval).
• the codeword corresponds to a channel coded bit of a transport block.
• the terminal calculates the number of modulation symbols occupied by various UCIs
• the terminal calculates the number of bits after encoding the various UCI channels
• the terminal performs channel coding correlation processing on the data, CQI, RI, and HARQ-ACK, and then multiplexes the encoded data with the encoded CQI, and finally the multiplexed bits and the encoded bits of the RI and the HARQ.
• the terminal performs a series of processing such as scrambling, modulation, DFT (Discrete Fourier Transform) and resource mapping on the channel interleaved, and then transmitting the signal to the base station;
• DFT Discrete Fourier Transform
• the base station performs channel decoding to determine whether the UCI transmission is correct. If it is correct, the original information bits of the transmitted CQI, RI and HARQ-ACK can be obtained.
• the above method is a method for transmitting a UCI when a PUSCH supports one codeword in one TTI, and in the technical development, the PUSCH can support multiple codewords in one TTI, for example, when using Layer Shifting or not.
• PUSCH can support up to two codewords in one TTI. Therefore, it is necessary to study the method of transmitting UCI when PUSCH can support multiple codewords in one frame. How the UCI is transmitted on the PUSCH of multiple codewords is a new problem, and there is no related prior art at present. Summary of the invention
• the embodiment of the present invention provides a method and apparatus for transmitting uplink control information.
• the technical solution is as follows:
• a method for transmitting uplink control information includes:
• the codeword corresponding to the UCI is determined among the plurality of codewords according to a preset rule
• a device for transmitting uplink control information including:
• a determining module configured to: when transmitting the uplink control information UCI on the physical uplink shared channel PUSCH of the multiple codewords, determine a codeword corresponding to the UCI among the plurality of codewords according to a preset rule;
• a transmission module configured to map the UCI to a corresponding codeword for transmission.
• the technical solution provided by the embodiment of the present invention solves the problem of how to transmit UCI on the PUSCH of multiple codewords, and can implement the scheme more easily based on LTE R8 without additionally adding too much standardized work.
• FIG. 1 is a flowchart of a method for transmitting uplink control information according to an embodiment of the present invention
• FIG. 2 is a flowchart of a method for transmitting uplink control information according to Embodiment 1 of the present invention
• FIG. 3 is a flowchart of a process of mapping each part after UCI partitioning to a corresponding codeword transmission and receiving by a base station according to Embodiment 1 of the present invention
• FIG. 4 is a flowchart of a process for processing data related to UCI channel coding by a terminal according to Embodiment 1 of the present invention
• FIG. 5 is a schematic diagram showing a position of data and UCI in a TTI after channel interleaving according to Embodiment 1 of the present invention
• 7 is a schematic flowchart of transmitting a UCI on two codewords according to Embodiment 2 of the present invention
• FIG. 8 is a flowchart of a method for transmitting uplink control information according to Embodiment 3 of the present invention
• FIG. 9 is a flowchart of a method for transmitting uplink control information according to Embodiment 4 of the present invention.
• FIG. 10 is a structural diagram of an apparatus for transmitting uplink control information according to Embodiment 5 of the present invention.
• FIG. 11 is another structural diagram of an apparatus for transmitting uplink control information according to Embodiment 5 of the present invention. Specific form
• an embodiment of the present invention provides a method for transmitting uplink control information, including:
• the above method solves the problem of how to transmit UCI over multiple codewords, and can support LTE R8 version, LTE R9 version and higher, which fills a gap in related technologies in the field.
• LTE R8 version since there is only one codeword, the codeword is directly determined as a codeword corresponding to the UCI, and the UCI is mapped onto the codeword for transmission.
• the UCI in the embodiment of the present invention may be any type of UCI, including but not limited to: CQI, RI, HARQ-ACK, or channel information, and the like, which is not specifically limited in this embodiment of the present invention.
• the UCI to be transmitted in the embodiment of the present invention may be one or multiple.
• a UCI refers to control information corresponding to a control information code block.
• the types of any two UCIs in the multiple UCIs may be the same or different, such as: There are 3 UCIs, all of which are CQIs; or, one is CQI, and one is RI. , one for
• preset rules in the embodiment of the present invention including but not limited to: one UCI mapping to one codeword transmission, one UCI divided into multiple parts respectively mapped to multiple codeword transmissions, and multiple UCI mappings
• the embodiment of the present invention does not specifically limit the transmission to a codeword.
• the following is a detailed description of the four embodiments.
• the preset rules in the embodiments of the present invention may be any one of the following four embodiments.
• this embodiment provides a method for transmitting uplink control information, which is divided into multiple parts and then transmitted with multiple codewords, including: 201: When UCI is transmitted on a PUSCH of multiple codewords, for a UCI to be transmitted, the UCI is divided into multiple parts, the number of the multiple parts is equal to the number of the multiple codewords, and each The portion corresponds to one of the plurality of code words.
• codeword 1 there are two codewords: codeword 1 and codeword 2, which divides a UCI into two parts, UCI1 and UCI2, where UCI1 corresponds to codeword 1, UCI2 corresponds to codeword 2.
• the method for dividing a UCI into a plurality of parts is not specifically limited in the embodiment of the present invention. Any two of the divided portions may be the same length or different.
• the processing flow of each part after the UCI division is the same.
• the process of the above 202 is specifically as follows:
• the current part of the UCI is HARQ-ACK or RL
• the following formula (1) is used for calculation.
• the current part of I is CQI
• the following formula (2) is used for calculation.
• the transmission bandwidth of the PUSCH; ⁇ is the sum of the number of information bits of the first code block and the number of CRC check bits; C is the number of code blocks; Vs is the number of SC-FDMA occupied by the same transport block; Qri The number of modulation symbols occupied by RJ; the number of bits of the CRC check bit, the value of L when the CQI is RM encoded is 0, the value when convolutional coding is 8; ⁇ TM is the modulation order; when UCI is HARQ -ACK, nPUSCH _ nHARQ-ACK nPUSCH _ nRl nPUSCH _ nCQl
• P. Ffsa P offset .
• P °ff set P. Ff set .
• formula (3) can be used for calculation:
• 303 Perform channel coding correlation processing on the transport block, that is, the data to be transmitted, CQI, RI, and HARQ-ACK, respectively, and multiplex the encoded data and the encoded CQI, and then combine the multiplexed bits with the RI.
• the coded bits and the coded bits of the HARQ-ACK are channel interleaved.
• the channel interleaved bits are subjected to a series of processing such as scrambling, modulation, DFT transform, and resource mapping, and then sent to the base station to complete UCI transmission.
• the series of processing refers to the related processing performed between the terminal and the base station for wireless transmission.
• the processing method is the same as the processing when the terminal side only transmits the service data without including the UCI, and therefore, details are not described herein.
• N is a natural number and NS ⁇ 2.
• the base station After receiving the signal from the terminal, the base station performs a series of processing on the signal, and performs channel interleaving and demultiplexing to separate the UCI information transmitted with the data; de-channel coding to determine whether the UCI transmission is correct, if correct, obtain The original information bits of the current part of the UCI transmitted by the terminal.
• the base station After obtaining the UCI part transmitted with each codeword, the base station obtains 110 parts, and then combines the N partial original information bits to obtain a complete UCI transmitted by the terminal, thereby completing the UCI transmission.
• the foregoing step 303 may specifically include:
• channel coding is also performed on the UCI, where channel coding is performed on the UCI, including: performing channel coding on the CQI, channel coding the RI, or channel coding the HARQ-ACK. This step is not limited to the above The order of 401-405, if UCI is CQI, it can be done before 406. If UCI is RI or HARQ-ACK, just do it before 407.
• the multiplexed bits are channel-interleaved with the channel-coded RI and the channel-coded HARQ-ACK.
• the channel interleaving makes the time-frequency position of the data and control information in a TTI after the PUSCH resource mapping is substantially as shown in FIG. 5.
• Each small square in the figure represents a time-frequency resource unit, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain.
• the above method provided by this embodiment solves the problem of how to transmit UCI on PUSCH of multiple codewords.
• the division of a uci into multiple parts, each encoded with a different codeword, can fully utilize the transmission power of the terminal.
• the total transmit power of the terminal is up to 23 dBm
• the transmit power of the two antennas on the terminal is at most 20 dBm.
• the UCI is divided into two parts and transmitted with two codewords, so that each UCI transmission is available on the root antenna. In this case, the maximum transmission power of UCI can reach 23dBm. If the UCI is not divided into two parts, but is transmitted with one of the codewords, the UCI is transmitted on only one antenna at a time.
• the maximum transmit power of the UCI can only reach 20 dBm.
• the method can make full use of the transmission power of the terminal.
• the method in this embodiment can reuse the LTE R8 version related standard and the transmitting and receiving processing flow in the implementation to the greatest extent, maintains backward compatibility, and can implement the solution more easily based on LTE R8, without additional increase. Too much standardized work.
• Example 2
• the embodiment provides another method for transmitting uplink control information.
• the channel-coded UCI is divided into multiple parts and then transmitted with multiple codewords. Specifically include:
• the process of channel coding the UCI is as follows:
• Equations (4) and (5) are corrections for the corresponding formula of LTE R8.
• the UCI occupies the same number of modulation symbols on each codeword, and both are ⁇ ' ⁇ P.
• O is! ; ⁇ the number of bits of the current part of the original information; M t is the same transmission block when it is first transmitted
• the transmission bandwidth symb of the PUSCH is the number of SC-FDMAs occupied by the same transmission block: Poffset is the offset of the current part of UCI relative to the MCS; M is the transmission bandwidth of the PUSCH; ⁇ is the zth codeword The sum of the number of information bits of the code block and the number of CRC check bits; the number of code blocks of the zth codeword;
• W is the number of codewords; the number of SC-FDMAs occupied by the same transport block; ⁇ is the number of modulation symbols occupied by RI on each codeword; L is the number of bits of CRC check bits, CQI is performed
• RM encoding is 0, the value when convolutional encoding is 8; ⁇ TM is the modulation order; when UCI is HARQ-ACK, When UCI is RI, when UCI is CQI, ⁇ ,
• the channel coding is first divided into multiple parts, and the channel coding is performed only once. It can be seen from /(4) and (5) that only The value can be calculated, no more than one
• this embodiment can save signaling overhead.
• equation (6) the calculation can be performed using equation (6):
• ⁇ is the number of bits after channel coding UCI, ⁇ »"'for the first ⁇ ' codeword modulation order, ⁇ 'is the number of modulation symbols occupied by UCI on each codeword.
• N is a natural number
• N 2 divides the channel-encoded UCI into N parts:
• UCI1, UCI2 UCIN respectively correspond to codeword 1, codeword 2 codeword N.
• One of the methods is that the number of bits occupied by each part on its corresponding codeword is calculated by ⁇ " « ⁇ ' ⁇ ', which represents the number of bits occupied by the i-th part on its corresponding i-th codeword.
• the channel interleaved bits are subjected to a series of processing such as scrambling, modulating, DFT, and resource mapping, and then sent to the base station. This step is the same as 304, and is not described here;
• the base station After receiving the signal from the terminal, the base station performs a series of processing on the signal, and deinterleaves and demultiplexes each codeword to separate the information of the UCI part transmitted with each codeword, N codes. A total of N UCI parts are obtained.
• two codewords are taken as an example to illustrate the specific implementation process of the foregoing method provided by this embodiment.
• the transport blocks on the two codewords are respectively channel coded, and the UCI performs channel coding, including: CQI, RI, HARQ-ACK; the channel coding is divided into two parts, wherein part of the mapping is transmitted to the first codeword, and A part of the mapping is transmitted to the second codeword, and the base station receives the de-channel interleaving and demultiplexing, and obtains two parts of the UCI, and performs combined re-channel decoding to obtain the original information bits of the UCI transmitted by the terminal.
• the above method provided in this embodiment solves the problem of how to transmit UCI on the PUSCH of multiple codewords.
• a UCI is divided into a plurality of parts after channel coding, and each is transmitted with a different codeword, and the transmission power of the terminal can be fully utilized for the same reason as described in Embodiment 1.
• the complexity of the implementation is reduced, the performance of the UCI is improved, and the scheme can be easily implemented based on the LTE R8 without additionally adding too much standardized work.
• the UCI is channel coded and then divided into multiple parts, and the channel coding is performed only once. It can be seen from equations (4) and (5) that only one value can be used for calculation, and multiple ⁇ , >PUSCH are not required.
• this embodiment provides another method for transmitting uplink control information. Different from the manners in Embodiments 1 and 2, a UCI is mapped to a codeword for transmission. Referring to FIG. 8, specifically, :
• the specified codeword may be a codeword specified by the terminal, or a codeword indicated by the uplink grant UL Grant, or a codeword that is signaled by the base station, such as by RRC (Radio Resource Control). ) Signaling notification.
• the UL Grant may display or implicitly indicate the codeword through one of the domains, such as by adding a domain in the UL Grant to display the codeword, or implicitly indicating the codeword through the MCS domain, the terminal The corresponding codeword can be determined according to the value of the MCS field.
• the UL Grant is obtained by the terminal by receiving downlink control signaling of the base station.
• the process may include:
• the base station After receiving the signal from the terminal, the base station separates the UCI transmitted by the codeword by de-interleaving and de-multiplexing, performs channel decoding, determines whether the UCI transmission is correct, and if correct, acquires the UCI transmitted by the terminal.
• the information is the same as 305 and will not be described here.
• the above method provided by this embodiment solves the problem of how to transmit UCI on PUSCH of multiple codewords.
• the LTE R8 version related standard and the transmission and reception processing flow in the implementation can be reused to the greatest extent, and the process is maintained.
• additional repetitive coding can be avoided, saving resources.
• the UCI to be transmitted by the terminal in the embodiment of the present invention may be a UCI for one downlink carrier or a UCI for multiple downlink carriers.
• the UCI of multiple downlink carriers may be independently coded or jointly coded, and the combined coding includes UCI joint coding of all downlink carriers, or UCI joint coding of some downlink carriers.
• the UCI of each downlink carrier will be channel coded separately.
• joint coding the UCIs of the jointly coded multiple downlink carriers jointly perform channel coding.
• the method for transmitting the uplink control information is provided in addition to the method provided in Embodiment 3, and FIG. 9 specifically includes :
• the codeword corresponding to each UCI is determined among the multiple codewords according to a preset rule.
• the pre-set rules are as follows:
• a plurality of UCIs such as Z, select Z codewords in a specified order, and the remaining Z UCIs
• M, N, X, Y and Z are all natural numbers, and N53 ⁇ 4 2.
• the order of designation involved in the above steps is specifically as follows: the order of MCS corresponding to each codeword is from high to low, or the order of MCS corresponding to each codeword is from low to high.
• the terminal may further map one of the multiple UCIs to a specified codeword, where the specified codeword may be a codeword specified by the terminal, or by UL Grant.
• the specified codeword may be a codeword specified by the terminal, or by UL Grant.
• One of the fields displays or implicitly indicates a codeword, or a codeword that is signaled by the base station. That is, the terminal can ensure that one of the UCIs is mapped to the specified codeword while satisfying the above rules.
• a plurality of UCIs are mapped to corresponding codewords uniformly and in a specified order, and UCI is not required to be divided into parts, and one or more UCIs are mapped on one codeword, which solves how The problem of transmitting multiple UCIs on PUSCHs of multiple codewords, and maximally reusing the LTE R8 version related standards and the implementation of the transmit and receive processing flows, maintaining backward compatibility, and based on LTE R8 Easily implement this solution without the need to add too much standardization work.
• mapping multiple UCIs onto multiple codewords it is avoided to map multiple UCIs onto one codeword, and a large number of resources are occupied by UCI.
• the available resources of the data are few, and the amount of data carried is very small.
• the small amount of data needs to be retransmitted on the same resource as this time. If there is no new UCI to be transmitted when retransmitting A scenario in which data is retransmitted at a very low code rate is generated, which causes unnecessary waste of resources. Therefore, the method of this embodiment can also effectively reduce unnecessary resource waste caused by data retransmission.
• the embodiment provides an apparatus for transmitting uplink control information, including:
• a determining module 1001 configured to: when transmitting a UCI on a PUSCH of multiple codewords, determine a codeword corresponding to the UCI among the plurality of codewords according to a preset rule;
• the transmission module 1002 is configured to map the UCI to the corresponding codeword for transmission.
• the determining module 1001 may specifically include: The first determining unit 1001a is configured to: when transmitting the UCI on the PUSCH of the multiple codewords, determine, for one UCI to be transmitted, the codeword specified in the multiple codewords as the codeword corresponding to the UCI, the specified code
• the word is a codeword specified by the terminal, or a codeword indicated by the UL Grant, or a codeword signaled by the base station.
• the UL Grant may display or implicitly indicate the codeword through one of the fields.
• the determining module 1001 specifically includes:
• the second determining unit 1001b is configured to, when transmitting the UCI on the PUSCH of the multiple codewords, divide the UCI into multiple parts for a UCI to be transmitted, and the number of the multiple parts is equal to the number of the multiple codewords And each part corresponds to one of the plurality of code words.
• the determining module 1001 specifically includes:
• the third determining unit 1001c is configured to, when transmitting the UCI on the PUSCH of the multiple codewords, perform channel coding on the UCI for one UCI to be transmitted, and divide the channel-encoded UCI into multiple parts, and multiple parts.
• the number is equal to the number of the plurality of code words, and each part corresponds to one of the plurality of code words.
• the determining module 1001 specifically includes:
• the fourth determining unit 1001d is configured to: when the UCI is transmitted on the PUSCH of the multiple codewords, for the plurality of UCIs of the same type in the UCI to be transmitted, if the number M and the codewords of the multiple types of the UCI of the same type Dividing the number N by an integer, dividing the M UCIs into N groups, each group corresponding to one of the N code words, and each group containing MN UCIs; if M ⁇ N and M/N If it is not an integer, M codewords are selected from the N codewords in a specified order, and M UCIs are corresponding to the M codewords, where each UCI corresponds to one codeword; if M>N and M/N is not an integer, the quotient is X, and the remainder is Y.
• one UCI is divided into groups, each group corresponds to one codeword of N codewords, and each group contains X UCIs, and then Y codewords are selected in the specified order in the N codewords, and the remaining U UCIs after the grouping are corresponding to the Y codewords, wherein each UCI corresponds to one codeword; M and N are natural numbers, And N 2 .
• the transmitting module 1002 specifically includes:
• the transmitting unit 1002a is configured to map each part of the UCI to a corresponding codeword for transmission.
• the specified order is specifically as follows: the order of the MCS corresponding to each codeword is from high to low, or the order of the MCS corresponding to each codeword is from low to high.
• Any of the above devices provided in this embodiment may be integrated in a terminal, and the terminal communicates with the base station in a wireless manner.
• the foregoing method provided in this embodiment solves how to transmit one or more on a PUSCH of multiple codewords.
• the UCI problem and, to the extent possible, reuses the LTE R8 version related standards and the implementation of the transmit and receive processing flow, maintains backward compatibility, and can easily implement the solution based on LTE R8, without additional addition too More standardized work. Mapping multiple UCIs to multiple codewords can improve the resources available for data, effectively reducing unnecessary resource waste caused by data retransmissions.
• All or part of the above technical solutions provided by the embodiments of the present invention may be completed by hardware related to program instructions, and the program may be stored in a readable storage medium, and the storage medium includes: a ROM, a RAM, a magnetic disk or an optical disk.

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