Data transmission method and device

Abstract

The present application discloses a data transmission method and apparatus. The method includes: A network device generates downlink control information (DCI). The DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme. The DCI includes a modulation and coding scheme (MCS) field. The DCI indicates a first modulation scheme when the MCS field is in a first state, or the DCI indicates a second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state. The network device transmits the DCI. A terminal receives the downlink control information (DCI) and receives or transmits data based on the DCI. In an embodiment of the present application, the first modulation scheme, the second modulation scheme, and the MCS index of the second modulation scheme are indicated by using different states in the MCS field to support a new modulation scheme without increasing DCI overhead.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202110362864.8, entitled "Data Transmission Method and Apparatus," filed with the State Intellectual Property Office of China on April 2, 2021, the entire contents of which are incorporated herein by reference.

[0002] Technical Field The present application relates to the field of communication technology, and in particular to a data transmission method and apparatus. [Background technology]

[0003] The Internet of Things (IoT) is a network oriented toward machine-type communication (MTC) and is an important network in the future communications field. IoT communication is mainly applied to smart metering, medical detection and monitoring, logistics detection, industrial detection and monitoring, Internet of Vehicles, intelligent communities, wearable device communication, etc. The application scenarios of the Internet of Things are diverse, from outdoor to indoor and above ground to underground, so many special requirements are imposed on the design of the Internet of Things, including improved coverage, a large number of terminals, low service rate requirements, insensitivity to delay, extremely low cost, and low power consumption.

[0004] To meet these special requirements, the 3rd Generation Partnership Project (3GPP) has approved a new research topic to investigate ways to support the Internet of Things with extremely low complexity and cost in cellular networks, launching the Narrowband Internet of Things (NB-IoT) topic.

[0005] Currently, the modulation scheme supported by NB-IoT in the downlink is Quadrature Phase Shift Keying (QPSK), and the modulation schemes supported by NB-IoT in the uplink are Binary Phase Shift Keying (BPSK) and QPSK. NB-IoT can support low-speed Internet of Things services. During data transmission, new modulation schemes such as 16 quadrature amplitude modulation (16QAM) and 64QAM are being considered to improve data transmission rates and support higher-speed Internet of Things services. How downlink control information (DCI) can support scheduling in these new modulation schemes is an urgent issue to be resolved. Summary of the Invention [Problem to be solved by the invention]

[0006] The embodiments of the present application provide a data transmission method and apparatus for supporting new modulation schemes. [Means for solving the problem]

[0007] According to a first aspect, there is provided a data transmission method, the method including: generating downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, the DCI including a modulation and coding scheme (MCS) field, the DCI indicating the first modulation scheme when the MCS field is in a first state, or the DCI indicating the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state; and transmitting the DCI.

[0008] In this embodiment of the present application, in order to support a new modulation scheme (first modulation scheme) without increasing the DCI overhead, it can be seen that the first modulation scheme, the second modulation scheme, and the MCS index of the second modulation scheme are indicated by using different states in the MCS field.

[0009] It should be noted that the DCI can only indicate the second modulation scheme, which means that the DCI can only indicate one of the two modulation schemes, and the DCI may further indicate other information.

[0010] In possible examples, when the DCI indicates only the second modulation scheme, the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; when the DCI indicates the first modulation scheme or the second modulation scheme, the DCI further includes K bits long indicating an MCS index of the first modulation scheme, where K is a positive integer and K is less than or equal to N; the DCI further includes a repetition field, the repetition field being NK bits long or less; or the DCI does not include a repetition field.

[0011] In a possible example, K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission, or N is 4 bits when the DCI schedules a downlink transmission.

[0012] In this embodiment of the present application, for a terminal that supports the NB-IoT capability of the first modulation scheme, when the DCI can only indicate the second modulation scheme, the bits indicating the repetition field in the DCI are reduced or even eliminated. In this way, by including a bit indicating the MCS field of the first modulation scheme in the DCI, the DCI can support scheduling in both the first modulation scheme and the second modulation scheme. This process avoids an increase in DCI overhead and ensures DCI transmission efficiency.

[0013] In a possible example, the DCI is control information scrambled by using the PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field.

[0014] In this embodiment of the present application, when the downlink control information is control information scrambled by using the PUR-RNTI, a new modulation scheme (first modulation scheme) can be supported without increasing the overhead of the downlink control information.

[0015] In one possible example, the DCI is control information scrambled by using a PUR-RNTI. If the DCI indicates a first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0016] In this embodiment of the present application, when the scrambled DCI can indicate only the second modulation scheme by using the PUR-RNTI, the bits indicating the repetition adjustment field in the DCI are reduced or even lost, and the field indicating the MCS index of the first modulation scheme is obtained by splitting the DCI so that the DCI can support scheduling in both the first modulation scheme and the second modulation scheme. This process avoids an increase in DCI overhead and ensures DCI transmission efficiency.

[0017] In one possible example, the MCS field is 4 bits.

[0018] In a possible example, the first state is "1111" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0019] In a possible example, the first modulation scheme is 16-quadrature amplitude modulation QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0020] According to a second aspect, there is provided a data transmission method, the method including the steps of receiving downlink control information (DCI), the DCI including a modulation and coding scheme (MCS) field, the DCI indicating a first modulation scheme when the MCS field is in a first state, or the DCI indicating a second modulation scheme and an MCS index for the second modulation scheme when the MCS field is in a second state; and receiving or transmitting data based on the DCI.

[0021] In possible examples, when the DCI indicates only the second modulation scheme, the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; when the DCI indicates the first modulation scheme or the second modulation scheme, the DCI further includes K bits long indicating an MCS index of the first modulation scheme, where K is a positive integer and K is less than or equal to N; the DCI further includes a repetition field, the repetition field being NK bits long or less; or the DCI does not include a repetition field.

[0022] In a possible example, K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission, or N is 4 bits when the DCI schedules a downlink transmission.

[0023] In a possible example, the DCI is control information scrambled by using the PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field.

[0024] In one possible example, the DCI is the control information scrambled by using a PUR-RNTI. If the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0025] In one possible example, the MCS field is 4 bits.

[0026] In a possible example, the first state is "1111" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0027] In a possible example, the first modulation scheme is 16-quadrature amplitude modulation QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0028] In a possible example, the step of receiving or transmitting data based on the DCI includes receiving or transmitting the data based on the first modulation scheme and an MCS index for the first modulation scheme indicated by the DCI, or based on the second modulation scheme and an MCS index for the second modulation scheme indicated by the DCI.

[0029] According to a third aspect, there is provided a data transmission method, the method including: generating downlink control information (DCI), the DCI being control information scrambled by using a PUR-RNTI, the DCI including an acknowledgement feedback or fallback indication field, the DCI including a modulation and coding scheme (MCS) field, and, when the MCS field is in a first state, the DCI including a first modulation scheme indication field indicating a first modulation scheme; and transmitting the DCI.

[0030] In this embodiment of the present application, for DCI scrambled by using PUR-RNTI, reserved bits in the DCI can be used to support scheduling in new modulation schemes without increasing downlink control information overhead, which avoids increasing DCI overhead.

[0031] In one possible example, when the MCS field is in a second state, a first modulation scheme is indicated by using a redundancy state in a subcarrier indication field.

[0032] In this embodiment of the present application, for DCI scrambled by using the PUR-RNTI, the MCS index of the first modulation scheme (new modulation scheme) is indicated by using redundancy in the subcarrier indication field, provided that the DCI continues to indicate the MCS index of the second modulation scheme (lower modulation), thereby avoiding an increase in DCI overhead and implementing simultaneous indication of two different modulation schemes. In this way, during modulation scheme switching for data scheduled by the DCI, the network device does not need to retransmit the DCI. This improves the efficiency of data scheduling by the DCI.

[0033] In one possible example, the DCI is the control information scrambled by using the PUR-RNTI. If the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0034] In a possible example, the first state is "1110" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0035] According to a fourth aspect, there is provided a data transmission method, the method including the steps of receiving downlink control information (DCI), the DCI being control information scrambled by using a PUR-RNTI, the DCI including an acknowledgement feedback or fallback indication field, the DCI including a modulation and coding scheme (MCS) field, and, when the MCS field is in a first state, the DCI including a first modulation scheme indication field indicating a first modulation scheme; and receiving or transmitting data based on the DCI.

[0036] In one possible example, when the MCS field is in a second state, a first modulation scheme is indicated by using a redundancy state in a subcarrier indication field.

[0037] In one possible example, the DCI is the control information scrambled by using the PUR-RNTI. If the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0038] In a possible example, the first state is "1110" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0039] In a possible example, the step of receiving or transmitting data based on the DCI includes receiving or transmitting the data based on the first modulation scheme and an MCS index of the first modulation scheme indicated by the DCI.

[0040] According to a fifth aspect, there is provided a data transmission method, the method including: generating downlink control information (DCI), the DCI including a modulation and coding scheme (MCS) field and a repetition field, the DCI indicating an MCS index of a first modulation scheme or an MCS index of a second modulation scheme, and if the DCI indicates only the MCS index of the second modulation scheme, the MCS field is N1 bits long and the repetition field is N2 bits long, or if the DCI indicates an MCS index of the first modulation scheme or an MCS index of the second modulation scheme, the MCS field is N1+1 bits long and the repetition field is N2-1 bits or less; or the DCI does not include a repetition field; and transmitting the DCI.

[0041] In this embodiment of the present application, when the bit value included in the downlink control information remains unchanged, if the downlink control information indicates an MCS field for a first modulation scheme or an MCS field for a second modulation scheme, one bit is added to the MCS field and one bit is removed from the repetition field, compared with when the downlink control information indicates only an MCS field for a second modulation scheme. In this way, there are enough states in the MCS field to support both the MCS field for the first modulation scheme and the MCS field for the second modulation scheme. This process avoids an increase in DCI overhead and ensures DCI transmission efficiency.

[0042] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0043] In possible examples, N1 is 4 bits and / or N2 is 3 bits when the DCI schedules an uplink transmission, or N2 is 4 bits when the DCI schedules a downlink transmission.

[0044] According to a sixth aspect, there is provided a data transmission method, the method including the steps of receiving downlink control information (DCI), the DCI including a modulation and coding scheme (MCS) field and a repetition field, the DCI indicating an MCS index of a first modulation scheme or an MCS index of a second modulation scheme, and if the DCI indicates only the MCS index of the second modulation scheme, the MCS field is N1 bits long and the repetition field is N2 bits long, or if the DCI indicates an MCS index of the first modulation scheme or an MCS index of the second modulation scheme, the MCS field is N1+1 bits long and the repetition field is N2-1 bits long; and receiving or transmitting data based on the DCI.

[0045] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0046] In a possible example, N1 is 4 bits and / or N2 is 3 bits when the DCI schedules an uplink transmission, or N2 is 4 bits when the DCI schedules a downlink transmission.

[0047] In a possible example, the step of receiving or transmitting data based on the DCI includes receiving or transmitting the data based on an MCS field of the first modulation scheme indicated by the DCI or an MCS field of the second modulation scheme indicated by the DCI.

[0048] According to a seventh aspect, there is provided a data transmission method, the method including the steps of: transmitting a first message, the first message indicating to a terminal the use of a first modulation scheme and indicating a modulation and coding scheme (MCS) index corresponding to the first modulation scheme, or including first indication information indicating to the terminal the use of a second modulation scheme and indicating an MCS index corresponding to the second modulation scheme, the first message being a random access response message for the terminal, where a subcarrier spacing configured by a network device for the terminal is 15 kHz and a subcarrier indication index is greater than 11; receiving a second message, the second message using the modulation scheme indicated by the first indication information, the second message including a radio resource control (RRC) connection establishment request message; and / or transmitting a third message, the third message using the modulation scheme indicated by the first indication information, the third message including a message for carrying a contention resolution identifier.

[0049] In this embodiment of the present application, when a random access response is sent, the first modulation scheme or the second modulation scheme is indicated to trigger the message for carrying the RRC connection establishment request information or the contention resolution identifier to use the first modulation scheme (new modulation scheme) in the subsequent random access process, i.e., a new modulation scheme is supported, which can effectively improve the information transmission rate and spectrum resource utilization in the random access process.

[0050] In one possible example, before the first message is transmitted, the method further includes the steps of receiving a fourth message, the fourth message including a random access preamble sequence; and determining a modulation scheme indicated by the fourth message based on a modulation scheme corresponding to the fourth message.

[0051] In one possible example, the preamble sequence is an early data transmission EDT preamble sequence.

[0052] In this embodiment of the present application, the preamble sequence is an EDT preamble sequence. In this case, the received second message further includes uplink data in addition to the RRC connection establishment request information. Since the second message is transmitted using the first modulation scheme, the transmission rate of the uplink data can be improved.

[0053] In a possible example, if the first indication information indicates the first modulation scheme, the method further includes transmitting first configuration information, the first configuration information including at least one TBS value, the at least one TBS value being greater than a maximum TBS value of the second modulation scheme.

[0054] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is QPSK.

[0055] According to an eighth aspect, there is provided a data transmission method, the method including: receiving a first message, the first message indicating to a terminal a first modulation scheme and indicating a modulation and coding scheme (MCS) index corresponding to the first modulation scheme, or indicating to a terminal a second modulation scheme and indicating an MCS index corresponding to the second modulation scheme, the first message being a random access response message for the terminal; transmitting a second message, the second message using the modulation scheme indicated by the first indication information, the second message including a radio resource control (RRC) connection establishment request message; and / or receiving a third message, the third message using the modulation scheme indicated by the first indication information, the third message including a message for carrying a contention resolution identifier.

[0056] In a possible example, before the first message is transmitted, the method further includes a step of transmitting a fourth message, the fourth message including a random access preamble sequence, and a modulation scheme corresponding to the fourth message being the first modulation scheme or the second modulation scheme.

[0057] In one possible example, the preamble sequence is an early data transmission EDT preamble sequence.

[0058] In one possible example, if the first indication indicates the first modulation scheme, the method further includes receiving first configuration information, the first configuration information including at least one TBS value, the at least one TBS value being greater than a maximum TBS value of the second modulation scheme.

[0059] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is QPSK.

[0060] According to a ninth aspect, there is provided a communication device, the device comprising: a processing unit configured to generate downlink control information (DCI), the DCI including a modulation and coding scheme (MCS) field, the DCI indicating the first modulation scheme when the MCS field is in a first state, or the DCI indicating a second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state; a transmitting unit configured to transmit the DCI.

[0061] In possible examples, when the DCI indicates only the second modulation scheme, the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; when the DCI indicates the first modulation scheme or the second modulation scheme, the DCI further includes K bits long indicating an MCS index of the first modulation scheme, where K is a positive integer and K is less than or equal to N; the DCI further includes a repetition field, the repetition field being NK bits long or less; or the DCI does not include a repetition field.

[0062] In a possible example, K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission, or N is 4 bits when the DCI schedules a downlink transmission.

[0063] In a possible example, the DCI is control information scrambled by using the PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field.

[0064] In one possible example, the DCI is control information scrambled by using a PUR-RNTI. If the DCI indicates a first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0065] In one possible example, the MCS field is 4 bits.

[0066] In a possible example, the first state is "1111" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0067] In a possible example, the first modulation scheme is 16-quadrature amplitude modulation QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0068] According to a tenth aspect, there is provided a communications device, the device comprising: a processing unit configured to receive downlink control information (DCI), the DCI including a modulation and coding scheme (MCS) field, the DCI indicating a first modulation scheme when the MCS field is in a first state, or the DCI indicating a second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state; and a transceiver unit configured to receive or transmit data based on the DCI.

[0069] In possible examples, when the DCI indicates only the second modulation scheme, the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; when the DCI indicates the first modulation scheme or the second modulation scheme, the DCI further includes K bits long indicating an MCS index of the first modulation scheme, where K is a positive integer and K is less than or equal to N; the DCI further includes a repetition field, the repetition field being NK bits long or less; or the DCI does not include a repetition field.

[0070] In a possible example, K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission, or N is 4 bits when the DCI schedules a downlink transmission.

[0071] In a possible example, the DCI is control information scrambled by using the PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field.

[0072] In one possible example, the DCI is the control information scrambled by using a PUR-RNTI. If the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0073] In one possible example, the MCS field is 4 bits.

[0074] In a possible example, the first state is "1111" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0075] In a possible example, the first modulation scheme is 16-quadrature amplitude modulation QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0076] In a possible example, the transceiver unit is specifically configured to receive or transmit the data based on the first modulation scheme and an MCS index for the first modulation scheme indicated by the DCI, or based on the second modulation scheme and an MCS index for the second modulation scheme indicated by the DCI.

[0077] According to an eleventh aspect, there is provided a communications device configured to perform the steps of: generating downlink control information (DCI), the DCI being control information scrambled by using a PUR-RNTI, the DCI including an acknowledgement feedback or fallback indication field, the DCI including a modulation and coding scheme (MCS) field, and, when the MCS field is in a first state, the DCI including a first modulation scheme indication field indicating a first modulation scheme; and transmitting the DCI.

[0078] In this embodiment of the present application, for DCI scrambled by using PUR-RNTI, reserved bits in the DCI can be used to support scheduling in new modulation schemes without increasing downlink control information overhead, which avoids increasing DCI overhead.

[0079] In one possible example, when the MCS field is in a second state, a first modulation scheme is indicated by using a redundancy state in a subcarrier indication field.

[0080] In this embodiment of the present application, for DCI scrambled by using the PUR-RNTI, the MCS index of the first modulation scheme (new modulation scheme) is indicated by using redundancy in the subcarrier indication field, provided that the DCI continues to indicate the MCS index of the second modulation scheme, thereby avoiding an increase in DCI overhead and implementing simultaneous indication of two different modulation schemes. In this way, during modulation scheme switching for data scheduled by the DCI, the network device does not need to retransmit the DCI. This improves the efficiency of data scheduling via DCI.

[0081] In one possible example, the DCI is the control information scrambled by using the PUR-RNTI. If the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0082] In a possible example, the first state is "1110" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0083] According to a twelfth aspect, there is provided a data transmission device, comprising: a transceiver unit configured to receive downlink control information (DCI), the DCI being control information scrambled by using a PUR-RNTI, the DCI including an acknowledgement feedback or fallback indication field, the DCI including a modulation and coding scheme (MCS) field, and when the MCS field is in a first state, the DCI including a first modulation scheme indication field indicating a first modulation scheme; and a processing unit configured in combination with the transceiver unit to receive or transmit data based on the DCI.

[0084] In one possible example, when the MCS field is in a second state, a first modulation scheme is indicated by using a redundancy state in a subcarrier indication field.

[0085] In one possible example, the DCI is the control information scrambled by using the PUR-RNTI. If the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field.

[0086] In a possible example, the first state is "1110" and the second state is a state other than 1111 and 1110 in "0000-1111".

[0087] In a possible example, the processing unit is specifically configured to receive or transmit the data based on the first modulation scheme and an MCS index of the first modulation scheme indicated by the DCI.

[0088] According to a thirteenth aspect, there is provided a data transmission device, the device comprising: a processing unit configured to generate downlink control information (DCI), the DCI including a modulation and coding scheme (MCS) field and a repetition field, the DCI indicating an MCS index of a first modulation scheme or an MCS index of a second modulation scheme, and if the DCI indicates only the MCS index of the second modulation scheme, the MCS field is N1 bits and the repetition field is N2 bits, or if the DCI indicates the MCS index of the first modulation scheme or the MCS index of the second modulation scheme, the MCS field is N1+1 bits and the repetition field is not more than N2-1 bits; or the DCI does not include a repetition field; a transmitting unit configured to transmit the DCI.

[0089] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0090] In possible examples, N1 is 4 bits and / or N2 is 3 bits when the DCI schedules an uplink transmission, or N2 is 4 bits when the DCI schedules a downlink transmission.

[0091] According to a fourteenth aspect, there is provided a data transmission device, comprising: a transceiver unit configured to receive downlink control information (DCI), the DCI including a modulation and coding scheme (MCS) field and a repetition field, the DCI indicating an MCS index of a first modulation scheme or an MCS index of a second modulation scheme, and if the DCI indicates only an MCS index of the second modulation scheme, the MCS field is N1 bits and the repetition field is N2 bits, or if the DCI indicates an MCS index of the first modulation scheme or an MCS index of the second modulation scheme, the MCS field is N1+1 bits and the repetition field is N2-1 bits; and a processing unit configured in combination with the transceiver unit to receive or transmit data based on the DCI.

[0092] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is quadrature phase shift keying QPSK.

[0093] In a possible example, N1 is 4 bits and / or N2 is 3 bits when the DCI schedules an uplink transmission, or N2 is 4 bits when the DCI schedules a downlink transmission.

[0094] In a possible example, receiving or transmitting data based on the DCI includes receiving or transmitting the data based on an MCS field of the first modulation scheme indicated by the DCI or an MCS field of the second modulation scheme indicated by the DCI.

[0095] According to a fifteenth aspect, there is provided a data transmission device, the device comprising: a transmitting unit configured to transmit a first message, the first message including first indication information indicating to a terminal that a first modulation scheme is to be used and indicating a modulation and coding scheme (MCS) index corresponding to the first modulation scheme, or indicating to a terminal that a second modulation scheme is to be used and indicating an MCS index corresponding to the second modulation scheme, the first message being a random access response message for the terminal; a receiving unit configured to receive a second message, the second message using a modulation scheme indicated by the first indication information, the second message including a radio resource control (RRC) connection establishment request message; and the transmitting unit further configured to transmit a third message, the third message using a modulation scheme indicated by the first indication information, the third message including a message for carrying a contention resolution identifier.

[0096] In one possible example, before the first message is transmitted, the receiving unit is further configured to: receive a fourth message, the fourth message including a random access preamble sequence; and determine a modulation scheme indicated by the fourth message based on a modulation scheme corresponding to the fourth message.

[0097] In one possible example, the preamble sequence is an early data transmission EDT preamble sequence.

[0098] In one possible example, when the first indication information indicates the first modulation scheme, the transmitting unit is further configured to transmit first configuration information, the first configuration information including at least one TBS value, the at least one TBS value being greater than a maximum TBS value of the second modulation scheme.

[0099] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is QPSK.

[0100] According to a sixteenth aspect, there is provided a data transmission device, comprising: a receiving unit configured to receive a first message, the first message indicating to a terminal a first modulation scheme and indicating a modulation and coding scheme (MCS) index corresponding to the first modulation scheme, or indicating to a terminal a second modulation scheme and indicating an MCS index corresponding to the second modulation scheme, the first message being a random access response message for the terminal; a transmitting unit configured to transmit a second message, the second message using a modulation scheme indicated by the first indication information, the second message including a radio resource control (RRC) connection establishment request message; and / or The receiving unit is further configured to receive a third message, wherein the third message uses a modulation scheme indicated by the first indication information, and the third message includes a message for carrying a contention resolution identifier.

[0101] In a possible example, before the first message is transmitted, the transmitting unit is further configured to transmit a fourth message, the fourth message including a random access preamble sequence, and a modulation scheme corresponding to the fourth message being the first modulation scheme or the second modulation scheme.

[0102] In one possible example, the preamble sequence is an early data transmission EDT preamble sequence.

[0103] In one possible example, if the first indication indicates the first modulation scheme, the method further includes receiving first configuration information, the first configuration information including at least one TBS value, the at least one TBS value being greater than a maximum TBS value of the second modulation scheme.

[0104] In a possible example, the first modulation scheme is 16QAM and the second modulation scheme is QPSK.

[0105] According to a seventeenth aspect, an embodiment of the present application provides a communication device, the device having functionality to implement any one of the possible implementations of the first, third, fifth, and seventh aspects.

[0106] The device may be a network device or a chip included in a network device. The functionality of the communication device may be implemented by hardware, or by hardware by executing corresponding software. The hardware or software may include one or more modules corresponding to the functionality.

[0107] In a possible design, the structure of the apparatus includes a processing unit and a transceiver unit, the processing unit configured to support the apparatus in performing a method according to the fourth aspect or any one of the possible implementations of the fourth aspect.

[0108] In another possible design, the device may include a processor and further include a memory. The processor may be coupled to the memory and configured to execute computer program instructions stored in the memory, thereby causing the device to perform a method according to the first, third, fifth, or seventh aspect, or any one of the possible implementations of the first, third, fifth, or seventh aspect. Optionally, the device further includes a communication interface, and the processor is coupled to the communication interface. When the device is a network device, the communication interface may be a transceiver or an input / output interface. When the device is a chip included in the network device, the communication interface may be the input / output interface of the chip. Optionally, the transceiver may be a transceiver circuit, and the input / output interface may be an input / output circuit.

[0109] According to an eighteenth aspect, an embodiment of the present application provides a communications device, the device having functionality to implement a terminal according to any possible implementation of the second, fourth, sixth, or eighth aspects.

[0110] The device may be a terminal or a chip included in the terminal. The functions of the communication device may be implemented by hardware, or may be implemented by hardware by executing corresponding software. The hardware or software may include one or more modules corresponding to the functions.

[0111] In a possible design, the structure of the apparatus includes a processing unit and a transceiver unit, the processing unit configured to support the apparatus in performing a method according to the fourth aspect or any one of the possible implementations of the fourth aspect.

[0112] In another possible design, the device may include a processor and further include a memory. The processor may be coupled to the memory and configured to execute computer program instructions stored in the memory such that the device performs a method according to the fourth aspect or any one of the possible implementations of the fourth aspect. Optionally, the device may further include a communication interface, and the processor may be coupled to the communication interface. When the device is a network device, the communication interface may be a transceiver or an input / output interface. When the device is a chip included in a network device, the communication interface may be an input / output interface of the chip. Optionally, the transceiver may be a transceiver circuit, and the input / output interface may be an input / output circuit.

[0113] According to a nineteenth aspect, an embodiment of the present application provides a chip system including a processor. The processor is coupled to a memory. The memory is configured to store a program or instruction. When the program or instruction is executed by the processor, the chip system is enabled to implement a method according to any one of the first, third, fifth, or seventh aspects, or possible implementations of the first, third, fifth, or seventh aspects.

[0114] Optionally, the chip system further includes an interface circuit, the interface circuit configured to exchange code instructions with the processor.

[0115] Optionally, there may be one or more processors in the chip system, and the processor may be implemented by hardware or software. When the processor is realized by hardware, the processor may be a logic circuit, an integrated circuit, etc. When the processor is implemented by software, the processor may be a general-purpose processor and is implemented by reading software code stored in a memory.

[0116] Optionally, there may be one or more memories in the chip system. The memory may be integrated with the processor or located separately from the processor. This is not limited in this application. For example, the memory may be a non-transitory processor, such as a read-only memory (ROM). The memory and the processor may be integrated on the same chip or located on different chips. The type of memory and the manner in which the memory and the processor are located are not particularly limited in this application.

[0117] According to a twentieth aspect, an embodiment of the present application provides a chip system including a processor. The processor is coupled to a memory. The memory is configured to store a program or instruction. When the program or instruction is executed by the processor, the chip system is capable of implementing a method according to the second aspect, the fourth aspect, the sixth aspect, or the eighth aspect, or any one of possible implementation forms of the second aspect, the fourth aspect, the sixth aspect, or the eighth aspect.

[0118] Optionally, the chip system further includes an interface circuit, the interface circuit configured to exchange code instructions with the processor.

[0119] Optionally, there may be one or more processors in the chip system, and the processor may be implemented by hardware or software. If the processor is implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc. If the processor is implemented by software, the processor may be a general-purpose processor and is implemented by reading software code stored in a memory.

[0120] Optionally, there may be one or more memories in the chip system. The memory may be integrated with the processor or located separately from the processor. This is not limited in this application. For example, the memory may be a non-transitory processor, such as a read-only memory (ROM). The memory and the processor may be integrated on the same chip or located on different chips. The type of memory and the manner in which the memory and the processor are located are not particularly limited in this application.

[0121] According to a twenty-first aspect, an embodiment of the present application provides a computer-readable storage medium having stored thereon a computer program or instructions that, when executed, enables a computer to perform a method according to any one of the first, third, fifth, or seventh aspects, or possible implementations of the first, third, fifth, or seventh aspects.

[0122] According to a twenty-second aspect, an embodiment of the present application provides a computer program product which, when read and executed by a computer, enables the computer to perform a method according to any one of the second, fourth, sixth, or eighth aspects, or possible implementations of the second, fourth, sixth, or eighth aspects.

[0123] According to a twenty-third aspect, an embodiment of the present application provides a communication system, the communication system including an apparatus according to the ninth and tenth aspects, or the communication system including an apparatus according to the eleventh and twelfth aspects, or the communication system including an apparatus according to the thirteenth and fourteenth aspects, or the communication system including an apparatus according to the fifteenth and sixteenth aspects. [Brief explanation of the drawings]

[0124] In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, the following briefly describes the accompanying drawings used in describing the embodiments.

[0125] [Figure 1] 1 is a schematic diagram of the structure of a communication system according to an embodiment of the present application;

[0126] [Figure 2A] 1 is a flowchart of a data transmission method according to an embodiment of the present application;

[0127] [Figure 2B] 1 is a schematic diagram of the structure of a DCI according to an embodiment of the present application;

[0128] [Figure 2C] FIG. 10 is a schematic diagram of another structure of a DCI according to an embodiment of the present application;

[0129] [Figure 2D] FIG. 10 is a schematic diagram of another structure of a DCI according to an embodiment of the present application;

[0130] [Figure 3A] 4 is a flowchart of another data transmission method according to an embodiment of the present application;

[0131] [Figure 3B] FIG. 10 is a schematic diagram of another structure of a DCI according to an embodiment of the present application;

[0132] [Figure 4A] 4 is a flowchart of another data transmission method according to an embodiment of the present application;

[0133] [Figure 4B] 1 is a schematic diagram of the structure of a DCI according to an embodiment of the present application;

[0134] [Figure 5A] 1 is a flowchart of a data transmission method according to an embodiment of the present application;

[0135] [Figure 5B] 1 is a schematic diagram of a random access process according to an embodiment of the present application.

[0136] [Figure 6] FIG. 1 is a block diagram of a configuration of a communication device according to an embodiment of the present application.

[0137] [Figure 7]1 is a schematic diagram of the structure of a communication device according to an embodiment of the present application;

[0138] [Figure 8] 1 is a schematic diagram of a hardware structure of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0139] In the specification, claims, and accompanying drawings of this application, terms such as "first," "second," "third," and "fourth" are intended to distinguish between different objects but do not indicate a particular order. Additionally, the terms "comprise" and "have," as well as any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include unlisted steps or units, or may optionally further include other specific steps or units of the process, method, product, or device.

[0140] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described with reference to the embodiment may be included in at least one embodiment of the present application. This phrase appearing in various places in the present specification does not necessarily refer to the same embodiment, nor is it an embodiment that is independent or optional and exclusive of another embodiment. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0141] "Multiple" means two or more. "And / or" describes an association relationship between associated objects and indicates three possible relationships. For example, A and / or B can represent three cases: only A is present, both A and B are present, or only B is present. The character " / " generally represents an "or" relationship between associated objects.

[0142] The application scenarios in the embodiments of the present application are first described.

[0143] Embodiments of the present application may be applied to Long Term Evolution (LTE) systems, e.g., NB-IoT systems, or to other wireless communication systems, e.g., Global System for Mobile Communications (GSM), Universal Mobile Telecommunications System (UMTS), Code Division Multiple Access (CDMA) systems, and new network device systems.

[0144] A terminal device referred to in embodiments of the present invention may be a device providing a user with voice and / or data connectivity, a handheld device with wireless connectivity, or another processing device connected to a wireless modem. A wireless terminal can communicate with one or more core networks through a Radio Access Network (RAN). A wireless terminal may be a mobile terminal, such as a mobile phone (also called a "cellular" phone) or a computer with a mobile terminal, e.g., a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges voice and / or data with a radio access network. A wireless terminal may be a device, such as a Personal Communication Service (PCS) phone, a cordless telephone set, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, or a Personal Digital Assistant (PDA). A wireless terminal may also be called a system, subscriber unit, subscriber station, mobile station, mobile console, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, or user equipment.

[0145] Embodiments of the present invention relate to a base station, which may be configured to convert received radio frames to and from IP packets and function as a router between wireless terminals and the rest of the access network. The rest of the access network may include Internet Protocol (IP) network devices. The base station may further coordinate air interface attribute management. For example, the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Node B in Wideband Code Division Multiple Access (WCDMA), or an evolved Node B (eNB or e-NodeB) in LTE. This is not a limitation of the embodiments of the present invention.

[0146] In the following, a specific embodiment will be described by using the LTE system as an example.

[0147] 1 is a schematic diagram of the structure of a communication system according to an embodiment of the present application. As shown in FIG. 1, the system includes one network device 101 and six terminal devices. The six terminal devices are terminal device 102, terminal device 103, terminal device 104, terminal device 105, terminal device 106, and terminal device 107. In the example shown in FIG. 1, terminal device 102 is an automobile, terminal device 103 is an intelligent air conditioner, terminal device 104 is an intelligent fuel dispenser, terminal device 105 is a mobile phone, terminal device 106 is a smart teacup, and terminal device 107 is a printer.

[0148] During communication between a terminal and a network device, the network device transmits DCI over the Physical Downlink Control Channel (PDCCH). DCI is control information for the Physical Downlink Shared Channel (PDSCH) or the Physical Uplink Shared Channel (PDSCH). Specifically, DCI includes resource block (RB) resource allocation information, modulation and coding scheme (MCS), hybrid automatic repeat request identifier (HARQ-ID), etc. Only after correctly decoding the DCI information can the terminal correctly process PDSCH data or PUSCH data.

[0149] In NB-IoT, DCI is carried in NPDCCH to perform uplink and downlink scheduling. DCI formats include DCI format N0 and DCI format N1. DCI format N0 is used to schedule uplink NPUSCH, and DCI format N1 is used to schedule downlink NPDSCH. In the embodiments of the present application, DCI format N0 is used as an example for explanation.

[0150] If the DCI format is format N0, see Table 1.1 for the contents included in the DCI. [Table 1]

[0151] In Table 1.1, the flag field for format N0 / format N1 distinction indicates that the DCI format is N0 or N1. Format N0 is used for uplink scheduling, and format N1 is used for downlink scheduling. By using the flag field for format N0 / format N1 distinction, a terminal device identifies whether the DCI format is format N0 or format N1 and determines whether the DCI is used for uplink scheduling or downlink scheduling. The flag field for format N0 / format N1 distinction is sometimes referred to as the DCI format flag field.

[0152] The subcarrier indication field indicates a set of consecutive subcarriers.

[0153] The Scheduling Delay field is used to determine the start time for transmitting uplink data and / or signaling scheduled by the DCI.

[0154] The resource allocation field is used to determine the allocation of uplink data and / or signaling resources scheduled by the DCI, e.g., time domain resource allocation.

[0155] The modulation and coding scheme field is used to determine the MCS index of the uplink data and / or signaling scheduled by the DCI. Based on the MCS field and the resource allocation field, the transport block size (TBS) of the uplink data can further be determined.

[0156] The repetition field is used to determine the number of repetitions of the uplink data scheduled by the DCI.

[0157] The New Data Indicator field indicates whether the currently scheduled transmission is a new transmission or a retransmission.

[0158] The redundancy version field is used to determine the redundancy version for transmitting uplink data and / or signaling.

[0159] The DCI repetition field is used to determine the number of repetitions of the DCI.

[0160] For uplink transmission in NB-IoT, the specific TBS table is as follows: [Table 2]

[0161] As shown in Table 1.2, the MCS index (I MCS ) based on the TBS index (I TBS ) is determined, and then the transmission time I is determined by referring to the resource allocation field in the DCI format N0. RU is determined and the TBS is decided.

[0162] The MCS index for QPSK corresponds to TBS indexes 0 to 13 in the TBS table. New modulation methods, such as 16QAM, correspond to TBS indexes 14 to 21 in the TBS table.

[0163] For downlink transmission in NB-IoT, the specific TBS table is as follows: [Table 3]

[0164] There are two deployment modes during downlink transmission: Standalone or Guard-Band (SA / GB) and In-Band (IB). In SA / GB deployment mode, the MCS index for QPSK corresponds to TBS index 0-13 in the TBS table, and the MCS index for 16QAM corresponds to TBS index 13-21 in the TBS table. In IB mode, the MCS index for QPSK corresponds to TBS index 0-10 in the TBS table, and the MCS index for 16QAM corresponds to TBS index 11-17 in the TBS table.

[0165] The MCS field in the DCI is 4 bits long and indicates only the second modulation scheme. In this case, if the TBS index is 0 to 13, see Table 1.4 for the allocation status of the MCS field. [Table 4]

[0166] As shown in Table 1.4, the 4-bit MCS field can indicate a total of MCS indices 0 to 15, where indices 0 to 13 indicate TBS indices for QPSK, and the remaining two MCS indices 14 and 15 are reserved.

[0167] When the TBS index of the second modulation method is 0 to 11, see Table 1.5 for the allocation status of the MCS field in the DCI. [Table 5]

[0168] A new modulation scheme is introduced into the data transmission process to improve the data transmission rate and further support faster Internet of Things services. Suppose the new modulation scheme (first modulation scheme) is 16QAM. As shown in Table 1.4, the 4-bit MCS field can indicate MCS indices 0 to 15 in total, with indices 0 to 13 indicating TBS indices for QPSK and the remaining two MCS indices, 14 and 15, being reserved. As a result, it cannot fully indicate TBS indices 14 to 21 for 16QAM.

[0169] Alternatively, as shown in Table 1.5, the 4-bit MCS field can indicate a total of MCS indices 0 to 15, where indices 0 to 10 indicate TBS indices for QPSK, and the remaining five MCS indices 11 to 15 are reserved, so that TBS indices 11 to 17 for 16QAM cannot be fully indicated.

[0170] A method that may be used where possible to enable DCI to support scheduling in new modulation schemes includes the following steps:

[0171] (1) Introduce a new bit to DCI.

[0172] A new bit is introduced into the DCI to indicate that the modulation scheme is 16QAM or QPSK. For example, a bit value of "0" indicates that the modulation scheme is QPSK. In this case, the bit value in the 4-bit MCS field represents the corresponding MCS index in the QPSK modulation scheme. A bit value of "1" indicates that the modulation scheme is 16QAM. In this case, the bit value in the 4-bit MCS field represents the corresponding MCS index in the 16QAM modulation scheme. For details, see Table 1.6. [Table 6]

[0173] As shown in Table 1.6, the states "0000" (0)-"0111" (7) ("-" means "or," i.e., multiple consecutive values ​​including the end-point values) in the MCS field indicate TBS indexes 14-21 for 16QAM, and the corresponding MCS indexes are 14-21. In this case, one dedicated bit in the MCS field indicates 16QAM or QPSK. For example, as shown in Table 1.6, "0" indicates QPSK and "1" indicates 16QAM.

[0174] Similarly, if the TBS index for 16QAM is 11 to 17, the states "10000" (0) to "10110" (6) ("-" means "to" i.e., multiple consecutive values ​​including the end values) in the MCS field indicate that the corresponding MCS index is 11 to 17.

[0175] Alternatively, the new one bit may be "0" indicating that another bit value in the MCS field represents a corresponding MCS index in the 16QAM modulation scheme. The new one bit may be "1" indicating that another bit value in the MCS field represents a corresponding MCS index in the QPSK modulation scheme. This is not a limitation in the embodiments of the present application.

[0176] (2) Add one bit to the MCS field.

[0177] A new bit is introduced into the MCS field (one bit is also added to the DCI), so that the MCS field contains 5 bits and can indicate a total of 32 states. In this case, it can indicate the number of MCS indexes for QPSK and the number of MCS indexes for 16QAM. For details, see Table 1.7. [Table 7]

[0178] As shown in Table 1.7, if the TBS index for 16QAM is 14 to 21, the index may be indicated by the states "01110" (14) to "10101" (21) in the MCS field.

[0179] Similarly, if the TBS index for 16QAM is 11 to 17, the index may be indicated by the states "01011" (11) to "10001" (17) in the MCS field.

[0180] (3) Adjust the mapping relationship between the MCS index and the TBS index.

[0181] The MCS field remains 4 bits long, but the mapping relationship between the MCS index and the TBS index is adjusted. That is, if the TBS index for 16QAM is 14-21, the sum of the number of TBS indexes for QPSK and 16QAM is 14 + 8 = 22, but these indices correspond to only 16 states (16 MCS index values) in the MCS field. It is possible that one MCS index state corresponds to multiple TBS index values, or one MCS index state corresponds to one TBS index value, but some TBS indices do not correspond to an MCS index. See Table 1.8 for details. [Table 8]

[0182] As shown in Table 1.8, when the state in the MCS field is "0001" and the MCS index value is 1, the corresponding mapped TBS index is 2. That is, even values ​​are used for the TBS index within the interval to achieve a compression effect.

[0183] Similarly, if the TBS index for 16QAM is 11 to 17, the total number of TBS indexes for QPSK and 16QAM is 10 + 7 = 17, and these indexes correspond to 16 states (16 MCS index values) in the MCS field. Also, if possible, one MCS index state may correspond to multiple TBS index values, or one MCS index state may correspond to one TBS index value.

[0184] In the above process, scheduling in a new modulation scheme can be indicated by DCI. An embodiment of the present application provides a data transmission method for further optimizing the allocation of bit values ​​in DCI, ensuring that all TBS indexes are fully indicated, and reducing the overhead caused by increasing the bit values ​​in DCI. As shown in Figure 2A, the method includes the following steps:

[0185] 201: A network device generates downlink control information (DCI), where the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, and the DCI includes a modulation and coding scheme (MCS) field, where when the MCS field is in a first state, the DCI indicates the first modulation scheme, or when the MCS field is in a second state, the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme.

[0186] 202: Network device sends DCI.

[0187] 203: The terminal receives the DCI and receives or transmits data based on the DCI.

[0188] A network device generates DCI to perform uplink and downlink scheduling. From the above description, it can be seen that the DCI format can be format N0 or format N1. In some possible cases, the DCI can indicate only a second modulation scheme, which may be, for example, QPSK. As shown in Table 1.1, the DCI in format N0 or format N1 includes an MCS field, which is 4 bits long. In addition, any state in "0000-1101" indicates a corresponding MCS index, which indicates that the MCS index corresponding to QPSK is 0-13, and may also indicate a TBS index for QPSK. The states "1110" and "1111" are unused.

[0189] It should be noted that the DCI can only indicate the second modulation scheme, which means that compared with the two modulation schemes, the DCI can only indicate the second modulation scheme, and the DCI further indicates other information.

[0190] To meet new communication requirements, DCI needs to support scheduling in new modulation schemes. The new modulation scheme may be, for example, 16QAM or 64QAM. 16QAM is used as an example for explanation. There are eight TBS indices corresponding to 16QAM, and the corresponding TBS index values ​​are 14 to 21. However, based on the original DCI format, two unused states remain in the MCS field indicating the TBS index. Some fields in the DCI may be reinterpreted to indicate the MCS index of the new modulation scheme and also to indicate the TBS index of the new modulation scheme, so that the DCI can indicate the new TBS index by using the existing bit length.

[0191] In this embodiment of the present application, the first state of the MCS indicates a first modulation scheme. The first modulation scheme may be a new modulation scheme, which has a modulation order equal to or greater than four, such as 16QAM. The second state of the MCS correspondingly indicates an MCS index of a second modulation scheme. The second modulation scheme may be a lower-order modulation originally supported by the DCI, which has a modulation order less than four, such as QPSK.

[0192] See Table 2.1 for more information about standalone or guard band deployment modes. [Table 9]

[0193] From Table 2.1, it can be seen that the first state is "1111" and the first modulation method is 16QAM, the second state is any one of "0000" to "1101" and the second modulation method is QPSK.

[0194] For more information about in-band deployment modes, see Table 2.2. [Table 10]

[0195] From Table 2.2, it can be seen that the first state is "1111", the first modulation scheme is 16QAM, and the second state is one of "0000" to "1000", and the second modulation scheme is QPSK. Optionally, since the MCS states "1001" to "1110" do not indicate anything else, any one of these states may be used as the first state to indicate the first modulation scheme.

[0196] It can be seen that in embodiments of the present application, in order to support new modulation schemes without increasing DCI overhead, the MCS field of the first modulation scheme and the MCS field of the second modulation scheme are indicated by using different states within the MCS field.

[0197] Optionally, the method further includes: when the DCI can indicate only the second modulation scheme, the DCI further includes a repetition field, where the repetition field is N bits, where N is a positive integer; when the DCI can indicate the first modulation scheme or the second modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, where the field indicating the MCS index of the first modulation scheme is K bits, where K is a positive integer, and K is less than or equal to N; the DCI further includes a repetition field, where the repetition field is N K bits or less; or the DCI does not include a repetition field.

[0198] When the MCS field indicates the first modulation scheme by using the first state, the MCS index of the first modulation scheme must also be indicated. Optionally, K bits can be extracted from the DCI bits as the field indicating the MCS index of the first modulation scheme. This field may be referred to as the MCS field of the first modulation scheme. For example, the first modulation scheme is 16QAM. Here, K=3. The states "000" (0) to "111" (7) in the MCS field of the first modulation scheme may indicate TBS indexes 14 to 21 of 16QAM, or may indicate TBS indexes 11 to 17 of 16QAM.

[0199] Since K bits are extracted from the bits of the DCI to form the MCS field that specifically indicates the first modulation scheme, another field in the DCI has K missing bits. Optionally, if the DCI can indicate only the second modulation scheme, the N bits in the repetition field can be changed to NK bits. For example, if the DCI can indicate only QPSK (the second modulation scheme), the corresponding length of the repetition field is 3 bits when the DCI performs uplink scheduling, and the corresponding length of the repetition field is 4 bits when the DCI performs downlink scheduling. After the DCI indicates the first modulation scheme or the second modulation scheme, the MCS field of the first modulation scheme may be K = 3 bits. In this case, for uplink scheduling, the repetition field is NK = 3 - 3 = 0 bits, and the DCI does not include a repetition field. For downlink scheduling, the repetition field is NK = 4 - 3 = 1 bit, and the repetition field may also be 1 bit. Alternatively, the remaining 1 bit is a reserved bit. In other words, the DCI does not include a repetition field. For downlink scheduling, K=4 is assumed. The repetition field is NK=4-4=0 bits. In other words, the DCI does not include a repetition field. In addition, the bit positions of the MCS field of the first modulation scheme may be the same as or different from the bit positions of the original repetition field. Figure 2B is a schematic diagram of a DCI structure according to an embodiment of the present application. As shown in Figure 2B, if the state in the MCS field is "1111", the DCI indicates 16QAM, and the original repetition field in the DCI is converted to the MCS field of 16QAM.

[0200] See the table below for the specific way in which the MCS field for 16QAM indicates the TBS index in the modulation scheme. [Table 11]

[0201] As shown in Table 2.3 or Table 2.4, when the state in the MCS field is "1111," the state of the MCS field indicates the first modulation scheme. In this case, the MCS index needs to be determined based on the state of the field indicating the MCS index of the first modulation scheme in the DCI to further determine the TBS index of the first modulation scheme. Table 2.3 shows the indication mode used when the TBS index of 16QAM is 14 to 21, and Table 2.4 shows the indication mode used when the TBS index of 16QAM is 11 to 17.

[0202] In this embodiment of the present application, for a terminal that supports the NB-IoT capability of the first modulation scheme (new modulation scheme), when the DCI can only indicate the second modulation scheme, it can be seen that the bits indicating the repetition field in the DCI are reduced or even lost. In this way, the DCI includes a bit indicating the MCS field of the first modulation scheme, so that the DCI can support scheduling in both the first modulation scheme and the second modulation scheme. This process avoids an increase in DCI overhead and ensures DCI transmission efficiency.

[0203] As shown in Table 2.1 and Table 2.2, since the state "1110" of the MCS field is also a reserved state, it should be noted that the state "1110" can also be used as the first state to indicate the first modulation scheme. In this case, the method for indicating the MCS index of the first modulation scheme is as described above. The details will not be described again here.

[0204] Optionally, the DCI generated by the network device is control information scrambled by using a Pre-configured Uplink Resource-Radio Network Temporary Identity (PUR-RNTI). For example, DCI format N0 scrambled using PUR-RNTI is used to describe the division of the corresponding bit fields as shown in Table 2.5. [Table 12]

[0205] As shown in Table 2.5, if the DCI is scrambled by using the PUR-RNTI, the MCS is 14, and the corresponding state in the MCS field is "1110", the DCI contains the following content:

[0206] The flag for the format N0 / format N1 distinction field indicates whether the DCI format is N0 or N1.

[0207] The corresponding state in the MCS field is "1110".

[0208] The Acknowledgement Feedback (ACK) or Fall Back Indication field indicates whether the current PUR transmission is successful or whether the next transmission will fall back to another transmission mode. Specific indications may be 0-ACK or 1-Fall Back. If the field indicates 0, the current PUR transmission is successful; if the field indicates 1, the transmission will fall back to the other transmission mode.

[0209] The NPUSCH Repetition Adjustment field indicates the number of times the physical uplink shared channel may be retransmitted.

[0210] The Timing Advance Adjustment (TA advance) field indicates the timing advance adjustment.

[0211] Reserved bits are bits that are not currently used in the DCI, and have a bit value of all 1s in the corresponding field.

[0212] Similarly, DCI scrambled using the PUR-RNTI must also support data scheduling in a new modulation scheme. DCI scrambled using the PUR-RNTI can indicate that the next data transmission mode uses a new modulation scheme. For DCI scrambled using the PUR-RNTI, the state "1110" in the MCS field corresponds to the indication in the ACK or Fallback Indication field to determine the next data transmission mode, i.e., the MCS field has a fixed value and a determined meaning, and does not indicate the first modulation scheme.

[0213] In this embodiment of the present application, the first state "1111" in the MCS field may indicate a first modulation scheme (in this case, the first state does not include "1110").

[0214] When the first state indicates a first modulation scheme, please refer to Figure 2C. Figure 2C is a schematic diagram of another structure of DCI according to an embodiment of the present application. As shown in Figure 2C, when the state in the MCS field is "1111", the DCI indicates 16QAM. In addition, the DCI scrambled by using the PUR-RNTI further includes a 1-bit acknowledgement feedback or fallback indication field, which indicates the next data transmission mode.

[0215] In addition, the MCS index of the first modulation scheme must also be indicated. Similarly, for example, the first modulation scheme is 16QAM. TBS indexes 14 to 21 of 16QAM require at least eight MCS index indications, or TBS indexes 11 to 17 of 16QAM require at least seven MCS index indications. Generally, three bits can be extracted from the existing bits of the DCI to form the MCS field indicating 16QAM. If the DCI scrambled using the PUR-RNTI can only indicate the MCS index of the second modulation scheme, the DCI includes a three-bit repetition adjustment field. Optionally, if the DCI scrambled using the PUR-RNTI indicates the first modulation scheme or the second modulation scheme, the DCI scrambled using the PUR-RNTI does not include a repetition adjustment field, and the field indicating the MCS index of the first modulation scheme, i.e., the indication field of the MCS index of the first modulation scheme, is obtained through division. Specifically, as shown in Figure 2C, the original repetition adjustment field in the DCI is converted into a 16QAM MCS field. In other words, if the DCI can only indicate a second modulation scheme (e.g., QPSK), the 3-bit repetition adjustment field does not exist, and a 16QAM MCS field is further obtained through division. The bit positions of the 16QAM MCS field may be the same as or different from the bit positions of the original repetition adjustment field.

[0216] The specific manner in which the MCS field of 16QAM indicates the TBS index in the modulation scheme is the same as that in Table 2.3 and Table 2.4, and the details will not be described again here.

[0217] Optionally, the reserved bits in the DCI scrambled by using the PUR-RNTI may be divided as the MCS field of 16QAM. The reserved bits are an unused field and can indicate any new parameters.

[0218] In this embodiment of the present application, when the scrambled DCI can indicate only the second modulation scheme by using the PUR-RNTI, the bits indicating the repetition adjustment field in the DCI are reduced or even lost, and the field indicating the MCS index of the first modulation scheme is obtained by dividing the DCI, so that the DCI can support scheduling in both the first modulation scheme and the second modulation scheme. This process avoids an increase in DCI overhead and ensures DCI transmission efficiency.

[0219] Alternatively, the first modulation scheme may also be indicated when the MCS field is in a state other than "1111" or "1110" (second state). The second state is a state of the MCS index indicating a second modulation scheme. When the TBS index is 0 to 13, the second state is one of "0000" to "1101". When the TBS index is 0 to 17, the second state is one of "0000" to "1000". The DCI further includes a subcarrier indication field including a total of 6 bits, which can indicate 64 states. Since the 64 states cannot be fully used in the existing subcarrier allocation, the first modulation scheme may be indicated by using redundant states in the subcarrier indication field.

[0220] Specifically, NB-IoT supports subcarrier spacing of 3.75 kHz (megahertz) and 15 kHz. For 3.75 kHz and 180 kHz, there are a total of 48 subcarriers. For 15 kHz and 180 kHz, there are a total of 12 subcarriers. 15 kHz supports scheduling of 1 subcarrier, 3 subcarriers, 6 subcarriers, and 12 subcarriers. The subcarrier index (Isc) indicated by the subcarrier indication field in DCI format N0 and the assigned subcarrier (n sc ) is shown in Table 3.1. [Table 13]

[0221] A total of 19 states are required, as shown in the table.

[0222] The terminal can learn the subcarrier spacing configuration in another message. If the subcarrier spacing is configured to be 3.75 kHz in the other message, the terminal can learn the subcarrier spacing configuration in another message. sc =I sc If the subcarrier spacing is configured to be 15 kHz in the other message, the terminal interprets the subcarrier indication field in DCI format N0 based on the relationship in Table 3.1. Thus, at 3.75 kHz (for a subcarrier spacing that uses more subcarrier indication field states), the subcarrier indication field in DCI format N0 has 16 (64 - 48) redundant states.

[0223] The DCI (which may be specifically DCI format N0) indicates that the first modulation scheme is a 16QAM modulation scheme. sc ) and the allocated subcarriers (n sc ) is shown in Table 3.2. [Table 14]

[0224] As shown in Table 3.2, a total of seven states 48-54 are used in the subcarrier indication field to indicate subcarriers corresponding to 16QAM. In this case, the remaining states in the subcarrier indication field are 55-63, i.e., a total of nine states. Some of the nine states may indicate that the assigned subcarriers correspond to the 16QAM modulation scheme.

[0225] Specifically, please refer to Figure 2D. Figure 2D is a schematic diagram of another structure of DCI according to an embodiment of the present application. As shown in (a) in Figure 2D, when the second state is any one of "0000" to "1101", 16QAM can be indicated by a redundant state in the subcarrier indication field, including 16QAM corresponding to scheduling of 3 subcarriers, 6 subcarriers, and 12 subcarriers, respectively.

[0226] Alternatively, as shown in (b) of Figure 2D, when the second state is one of "0000" to "1000", 16QAM can be indicated by a redundant state in the subcarrier indication field, including 16QAM corresponding to scheduling of 3 subcarriers, 6 subcarriers, and 12 subcarriers, respectively.

[0227] In addition to the first modulation scheme, the MCS index of the first modulation scheme also needs to be indicated. Optionally, as described in the previous embodiment, when the DCI indicates only the second modulation scheme, the bits indicating the repetition field may be reduced or even eliminated, so that the DCI includes bits indicating the MCS field of the first modulation scheme.

[0228] When a first modulation scheme is indicated by using a subcarrier indication field, an MCS index for the first modulation scheme is indicated by using another field, and an MCS index for a second modulation scheme is indicated by the DCI by using a second state, it can be expected that the DCI can indicate two different modulation schemes, which can indicate that DCI scheduling can be switched between two different modulation schemes.

[0229] In this embodiment of the present application, the first modulation scheme (new modulation scheme) is indicated by using redundancy in the subcarrier indication field, provided that the DCI continues to indicate the MCS index of the second modulation scheme, thereby avoiding an increase in DCI overhead and implementing simultaneous indication of two different modulation schemes. In this way, during the switching of the modulation scheme for data scheduled by the DCI, the network device does not need to retransmit the DCI. This improves the efficiency of data scheduling via DCI.

[0230] After generating the DCI, the network device transmits the DCI to the terminal. After receiving the DCI, the terminal transmits or receives data based on the DCI. Specifically, after receiving the DCI, the terminal demodulates the DCI to obtain the modulation scheme indicated by the DCI, determines an MCS index corresponding to the modulation scheme, and further determines a TBS index. Then, the terminal transmits data based on the modulation scheme and transport block indicated by the TBS index. For example, if the DCI indicates 16QAM and an MCS index corresponding to 16QAM, the terminal transmits data (including receiving or transmitting data) on the transport block corresponding to the TBS index indicated by the MCS index by using 16QAM.

[0231] In a downlink standalone or guard band deployment mode, when data is transmitted on a narrowband physical downlink shared channel (NPDSCH) by using 16QAM, the first power ratio is a ratio of the NPDSCH power per resource element to the NRS power per resource element on a time-domain symbol including the narrowband reference signal (NRS), and the second power ratio is a ratio of the energy per resource element (EPRE) of the NPDSCH to the NRS power per resource element on a time-domain symbol not including the narrowband reference signal (NRS). For a UE in which 16QAM modulation is performed, a network constraint or the network indicates whether the powers of the resource elements of the NPDSCH are the same based on a first message. If the powers are the same, the network indicates the first power ratio or the second power ratio to the UE. If the powers are different, the network indicates the first power ratio and the second power ratio to the UE. The UE receives the first message and demodulates the NPDSCH based on the first message.

[0232] In the downlink in-band mode, when data is transmitted on a narrowband physical downlink shared channel (NPDSCH) using 16QAM, the first power ratio is the ratio of the NPDSCH power per resource element to the NRS power per resource element on a time-domain symbol containing the narrowband reference signal (NRS), the second power ratio is the ratio of the NPDSCH energy per resource element (EPRE) to the NRS power per resource element on a time-domain symbol not containing the narrowband reference signal (NRS) and the cell-specific reference signal (CRS), and the third power ratio is the ratio of the NPDSCH energy per resource element (EPRE) to the NRS power per resource element on a time-domain symbol containing the cell-specific reference signal (CRS). For UEs using 16QAM modulation, the network constraint or the network indicates whether the powers of the NPDSCH resource elements are the same or partially the same. If all of the powers are the same, the network indicates the first power ratio, the second power ratio, or the third power ratio to the UE. If the power per resource unit of the NPDSCH on a time domain symbol including only the narrowband reference signal (NRS) is the same as the energy per resource element (EPRE) of the NPDSCH on a time domain symbol including no narrowband reference signal (NRS) or cell-specific reference signal (CRS), the network indicates the first power ratio or the second power ratio and the third power ratio to the UE. If all of these powers are different, the network indicates the first power ratio, the second power ratio, and the third power ratio to the UE. The UE receives the first message and demodulates the NPDSCH based on the first message. The UE receives the first message and demodulates the NPDSCH based on the first message.

[0233] Alternatively, an embodiment of the present application further provides another data transmission method. As shown in Figure 3A, the method includes the following steps:

[0234] 301: A network device generates downlink control information (DCI), where the DCI is control information scrambled by using a PUR-RNTI, the DCI includes an acknowledgement feedback or fallback indication field, the DCI includes a modulation and coding scheme (MCS) field, and when the MCS field is in a first state, the DCI includes a first modulation scheme indication field indicating a first modulation scheme.

[0235] 302: The network device sends a DCI.

[0236] 303: The terminal receives the DCI and receives or transmits data based on the DCI.

[0237] As described in the previous embodiment, the first modulation scheme is a new modulation scheme, such as 16QAM or 64QAM, and the second modulation scheme is a lower-order modulation scheme, such as QPSK. In this embodiment of the present application, the DCI generated by the network device is control information scrambled by using the PUR-RNTI. According to Table 2.5 in the previous embodiment, when the state in the MCS field is "1110," the structure of the DCI scrambled by using the PUR-RNTI can be obtained.

[0238] When the state in the MCS field is "1110" (first state), a first modulation scheme may be indicated. Specifically, see FIG. 3B. FIG. 3B is a schematic diagram of another structure of a DCI according to an embodiment of the present application. As shown in FIG. 3B, when the state in the MCS field is "1110," the DCI includes a 1-bit acknowledgment feedback or fallback indication field. In this case, to specifically indicate the first modulation scheme, one bit is extracted from the original DCI scrambled by using the PUR-RNTI as a reserved bit, and this bit may be referred to as a first modulation scheme indication field. In FIG. 3B, if the first modulation scheme is 16QAM, the bit field may be referred to as a 16QAM indication field. In one possible case, the value of the 16QAM indication field is "0," indicating that the modulation scheme is 16QAM. Alternatively, the bit field may further indicate a second modulation scheme. For example, the value of the 16QAM indication field is "1", indicating that the modulation scheme is the second modulation scheme (for example, QPSK).

[0239] Similarly, the MCS index of the first modulation scheme needs to be indicated. Similar to the embodiments described in Figures 2A to 2C, when the DCI scrambled using the PUR-RNTI indicates only the MCS index of the second modulation scheme, the DCI includes a 3-bit repetition adjustment field. When the DCI scrambled using the PUR-RNTI indicates the first modulation scheme or the second modulation scheme, the DCI scrambled using the PUR-RNTI does not include a repetition adjustment field, but is divided into an MCS index indication field for the first modulation scheme. Specifically, as shown in Figure 3B, the original repetition adjustment field in the DCI is converted into an MCS field for 16QAM. The bit position of the MCS field for 16QAM may be the same as or different from the bit position of the original repetition adjustment field.

[0240] Optionally, one bit of the reserved bits in the DCI scrambled by using the PUR-RNTI may be divided as the MCS field of the first modulation scheme. The reserved bit is an unused field and can indicate any new parameters.

[0241] In this embodiment of the present application, it can be seen that for DCI scrambled by using PUR-RNTI, the reserved bits in the DCI can be used to support scheduling in new modulation schemes without increasing downlink control information overhead, which avoids increasing DCI overhead.

[0242] After generating the DCI, the network device transmits the DCI to the terminal. After receiving the DCI, the terminal transmits or receives data based on the DCI. Specifically, after receiving the DCI, the terminal demodulates the DCI to obtain the modulation scheme indicated by the DCI, determines the MCS index corresponding to the modulation scheme, and further determines the TBS index. Then, the terminal transmits data based on the modulation scheme and transport block indicated by the TBS index. In addition, the scrambled DCI using the PUR-RNTI further indicates whether the current PUR transmission is successful or whether the next transmission will fall back to another transmission mode by using an acknowledgement feedback or fallback indication field.

[0243] Therefore, after the terminal receives the DCI, if the DCI indicates whether the modulation scheme for the next data transmission, including a PUR transmission or other data transmission, is 16QAM and the MCS index of 16QAM, the terminal transmits data on the transport block indicated by the TBS index corresponding to the MCS index by using 16QAM.

[0244] In some cases, please refer to Figure 4A, which is a flowchart of another data transmission method according to an embodiment of the present application. As shown in Figure 4A, the method includes the following steps:

[0245] 401: A network device generates downlink control information (DCI), where the DCI can indicate an MCS index of a first modulation scheme or an MCS index of a second modulation scheme, or can indicate only an MCS index of the second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field and a repetition field, where if the DCI can indicate only an MCS index of the second modulation scheme, the MCS field is N1 bits and the repetition field is N2 bits, or if the DCI indicates an MCS index of the first modulation scheme or an MCS index of the second modulation scheme, the MCS field is N1+1 bits and the repetition field is N2-1 bits or less; or the DCI does not include a repetition field.

[0246] 402: The network device sends a DCI.

[0247] 403: The terminal receives the DCI and transmits or receives data based on the DCI.

[0248] As described in the previous embodiment, the first modulation scheme is a new modulation scheme, for example, 16QAM or 64QAM, and the second modulation scheme is a lower order modulation scheme, for example, QPSK.

[0249] If the DCI can only indicate the MCS index of the second modulation scheme, the corresponding downlink DCI content is shown in Table 1.1. The second modulation scheme may be QPSK, and the 4-bit MCS field indicates the QPSK MCS index, implementing the indication of the uplink TBS index 0-13. For downlink scheduling, in GB / SA deployment mode, the TBS index is 0-13, and in IB deployment mode, the TBS index is 0-10. The TBS index is also indicated by the corresponding 4 bits in the MCS field.

[0250] It should be noted that the DCI can only indicate the MCS index of the second modulation scheme, which means that the DCI can only indicate the MCS index of one modulation scheme out of the two modulation schemes, and the DCI further indicates other information.

[0251] In this embodiment of the present application, the DCI needs to further indicate the MCS index of the first modulation scheme in addition to the MCS field for QPSK to further indicate the TBS index of the first modulation scheme. If the first modulation scheme is 16QAM, the corresponding TBS index is 14 to 21 or 11 to 17. In the former case, at least eight MCS states are required for indication, and 14 MCS states for QPSK are considered, resulting in a total of 22 MCS states. In the latter case, at least seven MCS states are required for indication, and 11 MCS states for QPSK are considered, resulting in a total of 18 MCS states. However, a 4-bit MCS field cannot meet this requirement.

[0252] In view of this, this embodiment of the present application proposes adding one bit to the MCS field. That is, if the DCI can indicate only the second modulation scheme, the length of the MCS field is N1 bits and indicates the MCS index of the second modulation scheme. In this case, if the DCI indicates both the first modulation scheme and the second modulation scheme, the length of the MCS field is N1+1 bits and indicates the MCS index of the first modulation scheme or the second modulation scheme. For example, if the DCI can support scheduling using only the second modulation scheme, N1=4, as shown in Table 1.1. In this embodiment of the present application, when the DCI supports scheduling using both the first modulation scheme and the second modulation scheme, the length of the MCS field is 5 bits. In this way, the MCS field can indicate 25=32 MCS states, which can meet the requirements for indicating MCS indexes for 16QAM and QPSK. For details, please refer to Figure 4B. Figure 4B is a schematic diagram of a DCI structure according to an embodiment of the present application. As shown in Figure 4B, in the DCI, the MCS field is 5 bits and the repetition field is 2 bits. The MCS field indicates the MCS index of the first modulation scheme and the second modulation scheme.

[0253] Since one bit is added to the MCS field, another field needs to be shortened by one bit without changing the overall length of the DCI. In this embodiment of the present application, the field from which one bit is reduced is the repetition field. That is, if the DCI can support scheduling using only the second modulation scheme, the length of the repetition field is assumed to be N2 bits. In this case, if the DCI supports scheduling using both the first modulation scheme and the second modulation scheme, the length of the repetition field is N2-1 bits. Alternatively, the length of the repetition field may be less than N2-1 bits, or the DCI may no longer include a repetition field. For uplink transmissions scheduled by the DCI, N2=3. For downlink transmissions scheduled by the DCI, N2=4.

[0254] The 1 bit added to the MCS field and the 1 bit removed from the repetition field may be the same bit or different bits, which is not limited here.

[0255] For example, if the DCI supports scheduling of both the first modulation scheme and the second modulation scheme, the length of the MCS field is 5 bits, the first modulation scheme is 16QAM, and the second modulation scheme is QPSK. The manner in which the state in the MCS field indicates the TBS index is shown in Table 4.1. [Table 15]

[0256] As shown in the table, the MCS indexes corresponding to QPSK are 0 to 13, and the MCS indexes corresponding to 16QAM are 14 to 21. There is a one-to-one correspondence between the MCS index and the TBS index, and they have the same value.

[0257] Alternatively, see Table 4.2. [Table 16]

[0258] As shown in the table, the MCS index corresponding to QPSK is 0 to 13, and the TBS index corresponding to QPSK is 0 to 13. However, since TBS index 13 can be indicated by using the MCS index corresponding to QPSK or by using the MCS index corresponding to 16QAM, the MCS index corresponding to 16QAM is 14 to 22. In other words, the transport block corresponding to the TBS index can be used for both QPSK scheduling and 16QAM scheduling.

[0259] Alternatively, see Table 4.3. [Table 17]

[0260] As shown in the table, the MCS indices corresponding to QPSK are 0 to 13, indicating that the TBS indices corresponding to QPSK are 0 to 13. However, TBS indices 12 and 13 can be indicated by using the MCS indices corresponding to QPSK or by using the MCS indices corresponding to 16QAM, so the MCS indices corresponding to 16QAM are 14 to 23. In other words, the transport blocks corresponding to these TBS indices can be used for both QPSK scheduling and 16QAM scheduling.

[0261] Additionally, the manner in which the state in the MCS field indicates the TBS index is shown in Table 4.4. [Table 18]

[0262] As shown in the table, the MCS indexes corresponding to QPSK are 0 to 10, and the MCS indexes corresponding to 16QAM are 11 to 17. The MCS index and the TBS index have a one-to-one correspondence and have the same value.

[0263] Thus, for DCI for scheduling uplink transmissions, the repetition field is N2-1 bits, where N2 = 3. A manner of indicating the repetition field is shown in Table 4.5. [Table 19]

[0264] For DCI for scheduling downlink transmissions, the repetition field is N2-1 bits, where N2 = 4. A manner of indicating the repetition field is shown in Table 4.6. [Table 20]

[0265] In addition, when the MCS field indicates an MCS index of a first modulation scheme or an MCS index of a second modulation scheme, since the first modulation scheme is a new modulation scheme, the network device may further indicate the first modulation scheme by using higher layer signaling. In this way, after receiving the DCI and obtaining the MCS index, the network device can determine a specific first modulation scheme based on the higher layer signaling and further determine the MCS index of the modulation scheme.

[0266] In this embodiment of the present application, when the bit value included in the downlink control information remains unchanged, one bit is added to the MCS field and one bit is removed from the repetition field when the downlink control information indicates an MCS index for the first modulation scheme or an MCS index for the second modulation scheme, compared to when the downlink control information indicates only an MCS index for the second modulation scheme. In this way, there are enough states in the MCS field to support both the MCS index for the first modulation scheme and the MCS index for the second modulation scheme. This process avoids an increase in DCI overhead and ensures DCI transmission efficiency.

[0267] After receiving the DCI sent by the network device, the terminal also demodulates the DCI to obtain the modulation scheme and MCS index corresponding to the modulation scheme indicated by the DCI, and then transmits data based on the modulation scheme and the transport block indicated by the DCI. For details, please refer to the description of the embodiment corresponding to Figures 2A to 2C. The details will not be described again here.

[0268] IoT is sensitive to power consumption. Every time a terminal transmits uplink data, it must establish a Radio Resource Control (RRC) connection to a network device through a random access process. If the transmitted uplink data packets are small and infrequent, establishing an RRC connection during random access consumes a lot of power. This is unfavorable for energy conservation in IoT devices. In this case, early data transmission (EDT) technology is used; that is, the terminal can transmit small packets of uplink data along with an RRC connection establishment request (Msg 3) during the random access process. This eliminates the need to transmit small packets only after the entire random access process is completed and the RRC connection is set up. How to support scheduling with new modulation schemes during the random access process is an urgent issue that needs to be resolved.

[0269] Please refer to Figure 5A, which is a flowchart of a data transmission method according to an embodiment of the present application. As shown in Figure 5A, the method includes the following steps:

[0270] 501: A network device transmits a first message, the first message indicating to a terminal that a first modulation scheme is to be used and indicating a modulation and coding scheme (MCS) index corresponding to the first modulation scheme, or indicating to the terminal that a second modulation scheme is to be used and indicating an MCS index corresponding to the second modulation scheme, the first message being a random access response message for the terminal, where the subcarrier spacing configured by the network device for the terminal is 15 kHz and the subcarrier indication index is greater than 11.

[0271] 502: The terminal receives a first message and sends a second message to the network device, where the second message uses a modulation scheme indicated by the first instruction information and includes a radio resource control (RRC) connection establishment request; and / or the terminal receives a third message sent by the network device, where the third message uses a modulation scheme indicated by the first instruction information and includes a message for carrying a contention resolution identifier.

[0272] In this embodiment of the present application, the first message sent by the network device is a random access response message for the terminal. In other words, the first message is a response message returned by the network device after the network device receives the random access request sent by the terminal. For the random access process, please refer to FIG. 5B. As shown in FIG. 5B, in the random access process, the terminal first sends a random access request to the network device. The random access request may specifically be a random access preamble sequence (which may be referred to as Msg 1). After receiving the random access request sent by the terminal, the network device sends a response message for the random access request (Random Access Response, RAR, which may be referred to as Msg 2) to the terminal. After receiving the random access response message, the terminal sends an RRC connection establishment request (which may be referred to as Msg 3) to the network device. After receiving the RRC connection establishment request, the network device sends a message (sometimes referred to as Msg 4) to the terminal to carry a contention resolution identifier. When the subcarrier indication index is greater than 11, the first indication information in the first message indicates the first modulation scheme or the second modulation scheme and the MCS index corresponding to the modulation scheme. If the first message indicates only the second modulation scheme and the MCS index of the second modulation scheme, specific indication manners are shown in Table 5.1. The redundancy status in the first indication information may indicate the first modulation scheme and the MCS index of the first modulation scheme. The first modulation scheme is 16QAM, and the second modulation scheme is QPSK.

[0273] Alternatively, a 1-bit modulation scheme indication field is added to the first message to indicate the first modulation scheme or the second modulation scheme. The first message does not include a repeat field or includes several bits in the repeat field, and two or three bits indicate the MCS index of the first modulation scheme.

[0274] Alternatively, if the 1-bit modulation scheme indication field indicates that the modulation scheme is 16QAM, "011-111" in the RAR indicates an MCS index corresponding to 16QAM. [Table 21]

[0275] As can be seen from Table 5.1, I sc is the index of the subcarrier indication field, nsc is the scheduled subcarrier, and I sc = 0 to 11 indicates that the scheduled subcarrier nsc is a single-carrier scheduling of one of the subcarriers with sequence numbers 0 to 11; I sc = 12 to 15 indicates that the scheduled subcarrier nsc is one of 0 to 2, 3 to 5, 6 to 8, and 9 to 11, which is a three-carrier scheduling; sc = 16~17 indicates that the scheduled subcarriers are either 0~5 or 6~11, which is 6-carrier scheduling; sc =18 indicates that the scheduled subcarriers are 0 to 11, which is 12-carrier scheduling. sc>11 indicates multi-carrier scheduling (>1). The number of RUs indicates the number of subframes transmitted. MCS states "000" to "010" (MCS index 0 to 2) indicate QPSK (second modulation scheme) or Pi / 2 BPSK (second modulation scheme) and Pi / 4 QPSK (third modulation scheme). "011" to "111" (MCS index 3 to 7) are reserved.

[0276] In view of this, when the first message indicates a first modulation scheme and an MCS index for the first modulation scheme, or when the first message indicates a second modulation scheme and an MCS index for the second modulation scheme, the corresponding indication manner may be shown in Table 5.2. [Table 22]

[0277] The subcarrier spacing is 15 kHz, and I sc >11, as shown in Table 5.2, MCS states "000" to "010" (MCS index 0 to 2) still indicate QPSK (second modulation scheme), and "011" to "101" indicate 16QAM (first modulation scheme).

[0278] In some possible cases, before transmitting the first message, the network device further receives a fourth message transmitted by the terminal, the fourth message including a preamble sequence used by the terminal to perform random access, and the network device can then determine the modulation scheme indicated by the first indication information based on the modulation scheme corresponding to the first message.

[0279] In other words, the random access preamble sequence (Msg 1) sent by the terminal device to the network device may be a preamble sequence corresponding to the first modulation scheme or a preamble sequence corresponding to the second modulation scheme. Therefore, after receiving the preamble sequence, the network device can determine the modulation scheme supported by the terminal for data transmission. Furthermore, the network device can determine how the first indication information indicates the modulation scheme. In some possible cases, the first indication information may indicate to the terminal that the modulation scheme corresponding to Msg 1 should be used, or may indicate to the terminal that a modulation scheme different from that corresponding to Msg 1 should be used. When transmitting an RRC connection establishment request message (Msg 3), the terminal transmits Msg 3 based on the indicated modulation scheme, and / or when receiving a message for carrying a contention resolution identifier (Msg 4), the terminal demodulates Msg 4 based on the indicated modulation scheme. This is not limited to this embodiment of the present application.

[0280] In some possible cases, the random access preamble sequence sent by the terminal to the network device is an EDT preamble sequence. In other words, the terminal supports the EDT transmission mode, and the terminal can transmit uplink data in the process of transmitting an RRC connection establishment request (Msg 3). In this case, after receiving the first indication information sent by the network device using the first message, the terminal transmits a second message to the network device, where the second message includes the RRC connection establishment request message and uplink data transmitted together. The terminal transmits the message based on the modulation scheme indicated by the first indication information and the transport block indicated by the TBS index value corresponding to the MCS field. After receiving the second message, the network device transmits a third message in response. In this case, in addition to the message for carrying the contention resolution identifier, the third message further includes downlink data. The message can be transmitted based on the modulation scheme indicated by the first indication information and the transport block indicated by the TBS index value corresponding to the MCS field.

[0281] In the above process, if the network device does not configure a corresponding transport block for a modulation scheme, the network device may send only configuration information to the terminal to configure the transport block. In one possible case, the network device configures a transport block only for a lower-order modulation but not for a new modulation scheme. In this case, the first instruction information is assumed to instruct the terminal to use the first modulation scheme. Because the first modulation scheme is a new modulation scheme and the terminal does not configure a transport block that can be called by the new modulation scheme, the network device may further send first configuration information to the terminal. The first configuration information includes a TBS value in a configurable TBS value set, and the TBS values ​​included in the set include at least one configurable maximum TBS value of the second modulation scheme.

[0282] For example, in an EDT transmission process, the maximum configurable TBS value corresponding to QPSK is "1000," and the network device configures a transport block corresponding to 16QAM for the terminal. More specifically, the TBS values ​​in the configurable TBS set in the first configuration information include one or more of {1192, 1352, 1544, 1736, 2024, 2280, 2536}. The network device configures any value in the TBS set corresponding to 16QAM for the terminal device, so that the terminal can perform transmission on a transport block corresponding to the first modulation scheme.

[0283] After receiving the first message sent by the network device, the terminal may transmit a second message based on the first indication information in the first message. In other words, the terminal transmits the second message based on the first modulation scheme or the second modulation scheme. From the above description, it can be seen that the second message may be an RRC connection establishment request message. In the EDT transmission mode, the second message may further include uplink data, which is also transmitted based on the modulation scheme indicated by the first indication information. In addition, the first indication information further indicates an MCS field of the first modulation scheme or the second modulation scheme, and the terminal transmits data based on the transport block corresponding to the TBS index indicated by the corresponding modulation scheme and MCS field.

[0284] Alternatively, the terminal may receive a third message transmitted by the network device. The third message is transmitted based on the first modulation scheme or the second modulation scheme. In the EDT transmission mode, the third message may further include downlink data, which may also be transmitted based on the first modulation scheme or the second modulation scheme. The network device may transmit the third message after or before the terminal transmits the second message, or may transmit the third message and the second message simultaneously. Assume that the terminal receives the third message transmitted by the network device. The method may further include the following steps: The network device transmits the third message, and the third message schedules data based on the first modulation scheme or the second modulation scheme and an MCS index corresponding to the first modulation scheme or the second modulation scheme.

[0285] In this embodiment of the present application, when sending a random access response to a terminal, the network device instructs the terminal to use the first modulation scheme or the second modulation scheme to trigger the subsequent random access process to use the first modulation scheme (new modulation scheme) for the RRC connection establishment request information or the message for carrying the contention resolution identifier, i.e., it is determined that the first modulation scheme is supported. This can effectively improve the information transmission rate and spectrum resource utilization in the random access process. Furthermore, the preamble sequence is an EDT preamble sequence. In this case, the received second message may further include uplink data in addition to the RRC connection establishment request information, and the third message may further include downlink data in addition to the message for carrying the contention resolution identifier (Msg 4). The second or third message is transmitted based on the first modulation scheme, thereby increasing the transmission rate of the uplink or downlink data contained in the second or third message.

[0286] 6 illustrates a communication device 600 according to an embodiment of the present application. The communication device 600 may be configured to perform the data transmission method and specific embodiments applied to the network devices of FIGS. 2A to 2D. In one possible implementation, as shown in FIG. 6, the communication device 600 includes a processing unit 601 and a transmitting unit 602.

[0287] The processing unit 601 is configured to generate downlink control information (DCI). The DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme. The DCI includes a modulation and coding scheme (MCS) field. The DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state.

[0288] The transmitting unit 602 is configured to transmit the DCI.

[0289] For the process of the processing unit 601 and the sending unit 602 performing the data transmission method, please refer to the specific description in the embodiment corresponding to Figures 2A to 2D, and the details will not be described again here.

[0290] Optionally, the processing unit 601 may be a chip, an encoder, an encoding circuit, or another integrated circuit capable of implementing the methods herein.

[0291] Optionally, the communication device 600 may further include a receiving unit. The receiving unit and the transmitting unit may be separate units or may be combined into a transceiver unit. The transceiver unit may be an interface circuit or a transceiver.

[0292] Optionally, the communication device 600 may further include a storage module (not shown). The storage module may be configured to store data and / or signaling, and may be coupled to the processing unit 601, the transmitting unit 602, the receiving unit, or the transceiver unit. For example, the processing unit 601 may be configured to read the data and / or signaling in the storage module so that the signal transmission method in the above method embodiments is performed.

[0293] 7 illustrates a communication device 700 according to an embodiment of the present invention. The communication device 700 may be applied to a terminal and configured to perform the data transmission methods and specific embodiments shown in FIGS. 2A to 2D. In one possible implementation, as shown in FIG. 7, the communication device 700 includes a processing unit 701 and a transceiver unit 702.

[0294] The processing unit 701 is configured to receive downlink control information (DCI). The DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme. The DCI includes a modulation and coding scheme (MCS) field. The DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state.

[0295] The transceiver unit 702 is configured to receive or transmit data based on the DCI.

[0296] For the process performed by the processing unit 701 and the transceiver unit 702 to transmit data, please refer to the specific description in the embodiment corresponding to Figures 2A to 2D, and the details will not be described again here.

[0297] Optionally, the processing unit 701 may be a chip, an encoder, an encoding circuit, or another integrated circuit capable of implementing the methods herein.

[0298] Optionally, the transceiver unit 702 may be an interface circuit or a transceiver.

[0299] Optionally, the communication device 700 may further include a storage module (not shown). The storage module may be configured to store data and / or signaling, and the storage module may be coupled to the processing unit 701 or the transceiver unit 702. For example, the processing unit 701 may be configured to read the data and / or signaling in the storage module so that the signal transmission method in the above method embodiments is performed.

[0300] 8 is a schematic diagram of a hardware structure of a communication device according to an embodiment of the present application. For the structure of the communication device of FIG. 6 or FIG. 7, please refer to the structure shown in FIG. 8. The communication device 900 includes a processor 111 and a transceiver 112. The processor 111 is electrically coupled to the transceiver 112.

[0301] The processor 111 is configured to execute some or all of the computer program instructions in the memory, which, when executed, enable the device to perform a method according to any one of the preceding embodiments.

[0302] The transceiver 112 is configured to communicate with another device, for example, to receive a message from a first network element, the message including a multicast and / or broadcast service identifier, a multicast and / or broadcast service key, and / or a multicast and / or broadcast service key identifier.

[0303] Optionally, the device further includes a memory 113 configured to store computer program instructions. Optionally, memory 113 (memory #1) is located within the device, memory 113 (memory #2) is integrated with processor 111, or memory 113 (memory #3) is located external to the device.

[0304] It should be understood that the communication device 900 shown in FIG. 8 may be a chip or a circuit, for example, a chip or a circuit that may be disposed in a terminal device or a communication device. Alternatively, the transceiver 112 may be a communication interface. The transceiver includes a receiver and a transmitter. The communication device 900 may also include a bus system.

[0305] The processor 111, the memory 113, and the transceiver 112 are connected through a bus system. The processor 111 is configured to execute instructions stored in the memory 113, receive signals, and control the transceiver to transmit signals to complete steps of the first device or the second device in the implementation method of the present application. The memory 113 may be integrated with the processor 111 or may be located separately from the processor 111.

[0306] In some implementations, the functionality of the transceiver 112 may be considered to be implemented by using a transceiver circuit or a dedicated transceiver chip. The processor 111 may be considered to be implemented by using a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip. The processor may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP. The processor may further include a hardware chip or another general-purpose processor. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any combination thereof. The general purpose processor may be a microprocessor, or the processor may be any conventional processor or the like.

[0307] It can be understood that the memory referred to in the embodiments of the present application may be volatile memory or nonvolatile memory, or may include volatile memory and nonvolatile memory. The nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory may be random access memory (RAM) and is used as an external cache. By way of example and not limitation, many forms of RAM may be used, such as static random access memory (Static RAM, SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), Synchlink dynamic random access memory (Synchlink DRAM, SLDRAM), and direct Rambus random access memory (Direct Rambus RAM, DR RAM). Note that memory as described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0308] An embodiment of the present application provides a computer storage medium storing a computer program for use in performing a method corresponding to a network element device, such as an AF / AS, a NEF / MBSF-C, a MB-SMF, or a UDR / UDM, in the aforementioned embodiments.

[0309] An embodiment of the present application provides a computer storage medium storing a computer program for use in a terminal device to execute a method corresponding to the aforementioned embodiment.

[0310] An embodiment of the present application provides a computer program product including instructions, which, when executed on a computer, enable the computer to perform a method corresponding to a network element device, such as an AF / AS, a NEF / MBSF-C, a MB-SMF, or a UDR / UDM, in the aforementioned embodiments.

[0311] An embodiment of the present application provides a computer program product including instructions, which, when executed on a computer, enable the computer to perform a method corresponding to the terminal device in the aforementioned embodiment.

[0312] It should be understood that the sequence numbers of the above processes do not mean the execution sequence in various embodiments of the present application, and the execution order of the processes should be determined based on the functions and internal logic of those processes, but should not be construed as any limitation on the implementation process in the embodiments of the present application.

[0313] Those skilled in the art may recognize that, in combination with the examples described in the embodiments disclosed herein, the units and algorithm steps may be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether a function is performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be considered to go beyond the scope of the present application.

[0314] For the sake of convenience, those skilled in the art can clearly understand that the detailed operating processes of the aforementioned systems, devices and units may be referred to the corresponding processes in the aforementioned method embodiments, and the details will not be described again here.

[0315] In some embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely examples. For example, the division of units is merely a logical division of function, and other divisions may be used in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented. In addition, mutual couplings or direct couplings or communication connections shown or discussed may be implemented through some interfaces. Indirect couplings or communication connections between devices or units may be implemented electronically, mechanically, or otherwise.

[0316] Units described as separate parts may or may not be physically separate, and parts shown as units may or may not be physical units, and may be located in one location or distributed over multiple network units, some or all of which may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments.

[0317] In addition, the functional units in the embodiments of the present application may be integrated into one processing unit, each of the units may exist physically alone, or two or more units may be integrated into one unit.

[0318] When a function is implemented in the form of a software functional unit and sold or used as an independent product, the function may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application may essentially be implemented in the form of a software product, or a portion of the technical solutions may contribute to the prior art. The computer software product may be stored in a storage medium and include instructions for instructing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or some of the steps of the methods described in the embodiments of the present application. The storage medium may include any medium capable of storing program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0319] The above description is merely a specific implementation of the present application and is not intended to limit the scope of protection of the present application. Any modifications or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. 1. A data transmission method, the method comprising: generating downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111", and the second state being a state in "0000 to 1111" other than 1111 and 1110; transmitting the DCI; The DCI is control information scrambled by using a PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field. method.

2. the DCI further includes a repetition field; When the first modulation scheme is 16-quadrature amplitude modulation (QAM), and the DCI indicates 16-QAM, the repetition field is converted into a field indicating an MCS index of 16-QAM in the DCI. The method of claim 1.

3. 2. The method of claim 1, wherein the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; if the DCI indicates the first modulation scheme or the second modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, the field indicating the MCS index of the first modulation scheme being K bits long, where K is a positive integer and K is less than or equal to N; or the DCI does not include the repetition field, or the DCI includes the repetition field, and the repetition field is N-K bits long.

4. 2. The method of claim 1, wherein the MCS field is 4 bits.

5. 2. The method of claim 1, wherein the first modulation scheme is 16-quadrature amplitude modulation (QAM) and the second modulation scheme is quadrature phase shift keying (QPSK).

6. 4. The method of claim 3, wherein K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission or N is 4 bits when the DCI schedules a downlink transmission.

7. A data transmission method, the method comprising: generating downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111", and the second state being a state in "0000 to 1111" other than 1111 and 1110; transmitting the DCI; The DCI is control information scrambled by using a PUR-RNTI, and when the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field. method.

8. 1. A data transmission method, the method comprising: receiving downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only a second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111", and the second state being a state other than 1111 and 1110 in "0000 to 1111"; receiving or transmitting data based on the DCI; The DCI is control information scrambled by using a PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field. method.

9. the DCI further includes a repetition field; When the first modulation scheme is 16-quadrature amplitude modulation (QAM), and the DCI indicates 16-QAM, the repetition field is converted into a field indicating an MCS index of 16-QAM in the DCI. The method of claim 8.

10. 9. The method of claim 8, wherein the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; if the DCI can indicate the first modulation scheme or the second modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, the field indicating the MCS index of the first modulation scheme being K bits long, where K is a positive integer and K is less than or equal to N; the DCI does not include the repetition field, or the DCI includes the repetition field, and the repetition field is N-K bits long.

11. 9. The method of claim 8, wherein the MCS field is 4 bits.

12. 9. The method of claim 8, wherein the first modulation scheme is 16-quadrature amplitude modulation (QAM) and the second modulation scheme is quadrature phase shift keying (QPSK).

13. 9. The method of claim 8, wherein the step of receiving or transmitting data based on the DCI includes receiving or transmitting the data based on the first modulation scheme and an MCS index for the first modulation scheme indicated by the DCI, or based on the second modulation scheme and an MCS index for the second modulation scheme indicated by the DCI.

14. 11. The method of claim 10, wherein K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission or N is 4 bits when the DCI schedules a downlink transmission.

15. A data transmission method, the method comprising: receiving downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only a second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111", and the second state being a state other than 1111 and 1110 in "0000 to 1111"; receiving or transmitting data based on the DCI; The DCI is control information scrambled by using a PUR-RNTI, and when the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field. method.

16. 1. A communications device, the device comprising: a processing unit configured to generate downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111" and the second state being a state in "0000 to 1111" other than 1111 and 1110; a transmitting unit configured to transmit the DCI; The DCI is control information scrambled by using a PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field. Device.

17. the DCI further includes a repetition field; When the first state is "1111", the first modulation scheme is 16-quadrature amplitude modulation (QAM), and the DCI indicates 16-QAM, the repetition field is converted into a field indicating an MCS index of 16-QAM in the DCI.

17. The apparatus of claim 16.

18. 18. The apparatus of claim 16 or 17, wherein the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; when the DCI indicates the first modulation scheme or the second modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, the field indicating the MCS index of the first modulation scheme being K bits long, where K is a positive integer and K is less than or equal to N; the DCI does not include the repetition field, or the DCI includes the repetition field, and the repetition field is N-K bits long.

19. 17. The apparatus of claim 16, wherein the MCS field is 4 bits.

20. 17. The apparatus of claim 16, wherein the first modulation scheme is 16-quadrature amplitude modulation (QAM) and the second modulation scheme is quadrature phase shift keying (QPSK).

21. 20. The apparatus of claim 18, wherein K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission or N is 4 bits when the DCI schedules a downlink transmission.

22. A communications device, comprising: a processing unit configured to generate downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111" and the second state being a state in "0000 to 1111" other than 1111 and 1110; a transmitting unit configured to transmit the DCI; The DCI is control information scrambled by using a PUR-RNTI, and when the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field. Device.

23. 1. A communications device, the device comprising: a processing unit configured to receive downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111" and the second state being a state in "0000 to 1111" other than 1111 and 1110; a transceiver unit configured to receive or transmit data based on the DCI; The DCI is control information scrambled by using a PUR-RNTI, and the DCI further includes an acknowledgement feedback or fallback indication field. Device.

24. the DCI further includes a repetition field; When the first state is "1111", the first modulation scheme is 16-quadrature amplitude modulation (QAM), and the DCI indicates 16-QAM, the repetition field is converted into a field indicating an MCS index of 16-QAM in the DCI.

24. The apparatus of claim 23.

25. 25. The apparatus of claim 23 or 24, wherein the DCI further includes a repetition field, the repetition field being N bits long, where N is a positive integer; if the DCI can indicate the first modulation scheme or the second modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, the field indicating the MCS index of the first modulation scheme being K bits long, where K is a positive integer and K is less than or equal to N; the DCI does not include the repetition field, or the DCI includes the repetition field, and the repetition field is N-K bits long.

26. 24. The apparatus of claim 23, wherein the MCS field is 4 bits.

27. 24. The apparatus of claim 23, wherein the first modulation scheme is 16-quadrature amplitude modulation (QAM) and the second modulation scheme is quadrature phase shift keying (QPSK).

28. 24. The apparatus of claim 23, wherein the transceiver unit is specifically configured to receive or transmit the data based on the first modulation scheme and an MCS index for the first modulation scheme indicated by the DCI or the second modulation scheme and an MCS index for the second modulation scheme indicated by the DCI.

29. 26. The apparatus of claim 25, wherein K is 3 bits and / or N is 3 bits when the DCI schedules an uplink transmission or N is 4 bits when the DCI schedules a downlink transmission.

30. A communications device, comprising: a processing unit configured to receive downlink control information (DCI), the DCI can indicate a first modulation scheme or a second modulation scheme, or can indicate only the second modulation scheme, the DCI includes a modulation and coding scheme (MCS) field, the DCI indicates the first modulation scheme when the MCS field is in a first state, or the DCI indicates the second modulation scheme and an MCS index of the second modulation scheme when the MCS field is in a second state, the first state being "1111" and the second state being a state in "0000 to 1111" other than 1111 and 1110; a transceiver unit configured to receive or transmit data based on the DCI; The DCI is control information scrambled by using a PUR-RNTI, and when the DCI indicates the first modulation scheme, the DCI further includes a field indicating an MCS index of the first modulation scheme, and the DCI does not include a repetition adjustment field. Device.

31. 1. A communication device having a processor and an interface circuit, the interface circuitry is configured to exchange code instructions with the processor; The processor is configured to execute computer programs or instructions stored in at least one memory so as to enable the device to perform the method of any one of claims 1 to 7. Device.

32. 1. A communication device having a processor and an interface circuit, the interface circuitry is configured to exchange code instructions with the processor; The processor is configured to execute computer programs or instructions stored in at least one memory so as to enable the device to perform the method of any one of claims 8 to 15. Device.

33. A readable storage medium configured to store instructions which, when executed, perform the method of any one of claims 1 to 7.

34. A readable storage medium configured to store instructions which, when executed, perform the method of any one of claims 8 to 15.

35. A computer program product for causing a computer to carry out the method according to any one of claims 1 to 7.

36. A computer program product for causing a computer to carry out the method according to any one of claims 8 to 15.

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