WO2019095339A1 - Feedback method and device - Google Patents

Abstract

Provided in the application are a feedback method and a device. The method comprises: The network device determines a first downlink control information (DCI); The first DCI comprises N bit groups, wherein the N bit groups correspond to N terminal devices, and the N terminal devices work in CE Mode B. The i-th bit group in the first DCI is used to indicate whether the network device correctly receives uplink data sent by the i-th terminal device, wherein i≤N, i and N are positive integers. and the network device sends a first DCI. Therefore, the resource overhead can be reduced.

Description

Feedback method and device Technical field

The present application relates to the field of communications technologies, and in particular, to a feedback method and apparatus.

Background technique

The existing Long Term Evolution (LTE) system can support Machine Type Communication (MTC). The receiving bandwidth of the terminal device applied to the MTC is smaller than the system bandwidth. The bandwidth occupied by the physical downlink control channel (PDCCH) may be the entire system bandwidth, so that the terminal device applied to the MTC may not receive the bearer in the PDCCH. Downlink Control Information (DCI). Therefore, in order to enable the terminal device applied to the MTC to correctly receive the DCI, the DCI needs to be carried by the MTC Physical Downlink Control Channel (MPDCCH) of the device type communication.

In the existing transmission mechanism, the network device can send feedback information to the terminal device. The feedback information is carried in the DCI, and the feedback information is used to indicate whether the network device correctly receives the uplink data. However, the feedback information included in the DCI carried by each MPDCCH is only feedback information for one terminal device, that is, the feedback information in one DCI can only be fed back for the reception of uplink data sent by one terminal device. When the network device needs to feed back the uplink data sent by multiple terminal devices, multiple DCIs need to be sent, which occupies more MPDCCH resources, which makes the resource overhead larger. Especially in a case where the system can support a small frequency domain unit (for example, taking the bandwidth corresponding to three resource elements (RE) as an example) to transmit uplink data, the terminal served in the same time period and the same bandwidth The number of devices increases, and the overhead of the MPDCCH resources occupied by the DCI carrying the feedback information is more obvious.

Summary of the invention

The present application provides a feedback method and device for solving the problem of large resource overhead occupied by DCI carrying feedback information.

In a first aspect, the application provides a feedback method, the method comprising:

The network device determines the first downlink control information DCI, the first DCI includes N bit groups, the N bit groups correspond to N terminal devices, and the N terminal devices work in the coverage enhancement mode CE Mode B, The i-th bit group in the first DCI is used to indicate whether the network device correctly receives the uplink data sent by the i-th terminal device, where i≤N, i and N are positive integers; the network device sends The first DCI.

Compared with the prior art, the feedback information included in each DCI is only feedback information for one terminal device. According to the foregoing method, whether the network device can send uplink data for multiple terminal devices in the first DCI is correct. The feedback is received, so that the feedback efficiency is effectively improved, and since only one first DCI is sent for multiple terminal devices, the problem that the DCI that carries the feedback information occupies a large resource overhead is solved, and the resource overhead is reduced.

In a possible design, the second DCI of each of the N terminal devices has a payload size of K bits, and the second DCI is used to schedule terminal device specific uplink transmissions for the terminal device or Downstream transmission, K is a positive integer.

In a possible design, each of the N terminal devices sends the uplink data to occupy The resource is Q subcarriers, where Q is a positive integer less than 12; or,

The channel bandwidth of each of the N terminal devices is 1.4 MHz; or

The coverage enhanced physical downlink shared channel maximum bandwidth configuration configured by the network device for each of the N terminal devices is 5 MHz; or

The coverage enhanced physical downlink shared channel maximum bandwidth configuration configured by the network device for each of the N terminal devices is 20 MHz.

In one possible design, the load size of the first DCI is the same as the load size of the second DCI.

Therefore, the blind detection complexity of the terminal device can be reduced.

In a possible design, before the network device sends the first DCI, the network device sends a radio network temporary identifier information RNTI to the N terminal devices; the RNTI is used to indicate the first The DCI's cyclic redundancy check CRC scrambling code.

Through the above method, the terminal device can recognize the first DCI. In a possible design, before the network device sends the first DCI, the network device sends domain information corresponding to each terminal device to the N terminal devices;

The domain information corresponding to the ith terminal device is used to indicate the location of the ith bit group in the first DCI.

Through the above method, the terminal device can determine the location of the bit group corresponding to itself.

In a possible design, the ith bit group is used to indicate whether the network device correctly receives the uplink data sent by the ith terminal device, where the ith bit group indicates that the ith terminal device corresponds to Whether the uplink data of the two HARQ processes is correctly received; or the ith bit group indicates whether the HARQ process index corresponding to the uplink data sent by the ith terminal device and the uplink data corresponding to the HARQ process index are correctly received. .

The application provides a plurality of methods for indicating whether a network device correctly receives uplink data sent by an ith terminal device.

In a possible design, the first DCI further carries first indication information, where the first indication information is used to indicate that one or more of the N terminal devices retransmit uplink data.

The terminal device that receives the uplink data incorrectly and retransmits the uplink data may include the following two situations:

The first case is: when the terminal device determines, according to the first DCI, that the network device does not correctly receive the first redundancy version of the HARQ process transmitted by the terminal device, if the terminal device determines the maximum number of transmissions to reach the first redundancy version, further And transmitting, according to the first indication information carried in the first DCI, a second redundancy version of the HARQ process, that is, HARQ retransmission. The transmission order of the second redundancy version is after the transmission order of the first redundancy version.

The second case is: when the terminal device determines, according to the first DCI, that the network device does not correctly receive the first redundancy version of the HARQ process transmitted by the terminal device, if the terminal device determines that the maximum number of transmissions of the first redundancy version is not reached, further And transmitting the first redundancy version of the HARQ process according to the first indication information carried in the first DCI.

Therefore, the first indication information in the embodiment of the present application may be used to indicate that the same redundancy version is repeatedly transmitted, and may also be used for HARQ retransmission. Through the above method, signaling overhead can be effectively saved and resource utilization can be improved.

In a possible design, the first DCI further carries the second indication information, where the second indication information is used to indicate that one or more of the N terminal devices end detecting the physical downlink control channel or Or indicating that one or more of the N terminal devices enter an idle state. The physical downlink channel may be a machine physical downlink control channel MPDCCH.

In a second aspect, the application provides a feedback method, the method comprising:

The first terminal device sends uplink data to the network device; the first terminal device receives the first DCI; the first The DCI includes N bit groups, the N bit groups corresponding to N terminal devices, and the N terminal devices operate in a coverage enhancement mode CE Mode B, wherein an ith bit group in the first DCI is used to indicate Whether the network device correctly receives the uplink data sent by the ith terminal device, i ≤ N, i, and N are positive integers; the N terminal devices include the first terminal device.

Compared with the prior art, the feedback information included in each DCI is only feedback information for one terminal device. According to the foregoing method, whether the network device can send uplink data for multiple terminal devices in the first DCI is correct. The feedback is received, so that the feedback efficiency is effectively improved, and since only one first DCI is sent for multiple terminal devices, the problem that the DCI that carries the feedback information occupies a large resource overhead is solved, and the resource overhead is reduced.

In a possible design, the second DCI of each of the N terminal devices has a payload size of K bits, and the second DCI is used to schedule terminal device specific uplink transmissions for the terminal device or Downstream transmission, K is a positive integer.

In one possible design, the load size of the first DCI is the same as the load size of the second DCI.

In a possible design, before the first terminal device receives the first DCI sent by the network device, the first terminal device receives the RNTI sent by the network device, where the RNTI is used by the RNTI. And a scrambling code indicating a cyclic redundancy check CRC of the first DCI.

In a possible design, before the first terminal device receives the first DCI sent by the network device, the first terminal device receives domain information corresponding to the first terminal device that is sent by the network device. The domain information corresponding to the first terminal device is used to indicate the location of the bit group corresponding to the first terminal device in the first DCI. The domain information may be field information or an information element.

In a possible design, the ith bit group is used to indicate whether the network device correctly receives the uplink data sent by the ith terminal device, where the ith bit group indicates that the ith terminal device corresponds to Whether the uplink data corresponding to the two HARQ processes is correctly received; or the i-th bit group indicates whether the HARQ process index corresponding to the uplink data sent by the ith terminal device and the uplink data corresponding to the HARQ process index are correct receive.

In a possible design, the first DCI further carries first indication information, where the first indication information is used to indicate that one or more of the N terminal devices retransmit uplink data.

In a possible design, the first DCI further carries the second indication information, where the second indication information is used to indicate that one or more of the N terminal devices end detecting the physical downlink control channel or Instructing one or more of the N terminal devices to enter an idle state.

In a third aspect, the present application provides a feedback device that performs the method of any of the possible aspects of the first aspect or the first aspect. In particular, the apparatus comprises means for performing the method of the first aspect or any one of the possible implementations of the first aspect.

In a fourth aspect, the present application provides a feedback device that performs the method of any one of the possible aspects of the second aspect or the second aspect. In particular, the apparatus comprises means for performing the method of any of the possible implementations of the second aspect or the second aspect.

In a fifth aspect, the application provides a network device, including: a processor, a transceiver, and a memory. The memory can be used to store program code, and the processor is operative to invoke program code in the memory to perform the method of the first aspect or any of the possible implementations of the first aspect. For specific implementation steps, refer to the first aspect, which is not described here.

In a sixth aspect, the application provides a network device, including: a processor, a transceiver, and a memory. The memory can be used to store program code, and the processor is configured to invoke program code in the memory to perform the method of the second aspect or any of the possible implementations of the second aspect. For specific implementation steps, refer to the second aspect, which is not described here.

In a seventh aspect, the present application provides a computer program product, comprising: computer executable program code, when the computer executable program code is run on a computer, causing the computer to perform the aforementioned aspect or the aforementioned aspect The method in any possible implementation.

In an eighth aspect, the present application provides a computer readable medium storing computer executable program code, when the computer executable program code is run on a computer, causing the computer to perform the foregoing aspects or the foregoing A method in any of the possible implementations.

In a ninth aspect, the present application provides a chip comprising: a processing module and a communication interface, the processing module being configured to perform the method in any of the foregoing aspects or any of the foregoing aspects.

The chip further includes a storage module for computer executable program code, the computer executable program code stored by the memory includes instructions, the processing module is configured to execute the instruction, such that the processing module performs the aforementioned Aspect or method of any of the preceding aspects.

According to a tenth aspect, the present application provides a communication system, including the network device according to the fifth aspect and the terminal device according to the sixth aspect.

DRAWINGS

1 is a schematic structural diagram of a system of a communication system according to an embodiment of the present application;

2 is a flowchart of an overview of a feedback method in an embodiment of the present application;

3 is a schematic diagram of M domains in an embodiment of the present application;

4 is a second schematic diagram of M domains in the embodiment of the present application;

FIG. 5 is a schematic diagram of a corresponding domain of a second indication message in a first DCI according to an embodiment of the present disclosure;

FIG. 6 is a second schematic diagram of a corresponding field of the second indication information in the first DCI in the embodiment of the present application;

FIG. 7 is a schematic structural diagram of a feedback apparatus according to an embodiment of the present application;

FIG. 8 is a second schematic structural diagram of a feedback apparatus according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a network device according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed ways

Embodiments of the present application will be described below with reference to the accompanying drawings.

The embodiments of the present application are mainly applied to an LTE system or an evolved system thereof. The embodiment of the present application can also be applied to other communication systems, as long as the entity in the communication system needs to send uplink data, another entity needs to receive uplink data, and feedback the uplink data in a certain manner.

As shown in FIG. 1, a base station and a user equipment (UE) 1 to UE 6 form a communication system. In the communication system, the UE1 to the UE6 can transmit the uplink data to the base station, and the base station needs to receive the uplink data sent by the UE1 to the UE6, and feedback the uplink data to the UE1 to the UE6 in a certain manner. In addition, UE4 to UE6 can also form a communication system. In the communication system, the UE4 and the UE6 can send the uplink data to the UE5, and the UE5 needs to receive the uplink data sent by the UE4 and the UE6, and feedback the uplink data to the UE4 and the UE6 in a certain manner.

The network element mainly involved in the embodiment of the present application includes a network device and a terminal device. A network device is an entity on the network side that sends or receives signals. The network device can be a base station. The terminal device can be any UE. Terminal The device is an MTC UE, Bandwidth-reduced Low-complexity UE (BL UE), non-bandwidth reduced low complexity user equipment (non-BL UE) or bandwidth reduced low complexity user equipment (Coverage Enhancement) UE, CE UE), etc. In the embodiment of the present application, the terminal device works in a coverage enhancement mode (CE Mode) B mode.

As shown in FIG. 2, the embodiment of the present application provides a feedback method, where the method includes:

Step 200a: The first terminal device sends uplink data to the network device.

Step 200b: The second terminal device sends uplink data to the network device.

Both the first terminal device and the second terminal device belong to the first feedback group.

The first terminal device and the second terminal device are merely examples, and FIG. 2 is only an example, and is not limited to the present application. Specifically, the N terminal devices in the first feedback group can respectively send uplink data to the network device, where N is a positive integer.

Step 210: The network device determines the first DCI.

The first DCI includes N bit groups, the N bit groups correspond to N terminal devices, the N terminal devices belong to the first feedback group, and the N terminal devices work in CE Mode B, where the ith bit group is used. Instructing the network device whether to correctly receive the uplink data sent by the ith terminal device, i ≤ N, i and N are positive integers.

Step 220: The network device sends the first DCI.

Step 230a: The first terminal device receives the first DCI, and determines, according to the first DCI, whether the network device correctly receives the uplink data sent by the first terminal device.

Step 230b: The second terminal device receives the first DCI, and determines, according to the first DCI, whether the network device correctly receives the uplink data sent by the second terminal device.

In a possible design, the first DCI further carries the first indication information, where the first indication information is used to indicate that one or more of the N terminal devices retransmit the uplink data.

In the prior art, a Hybrid Automatic Repeat Request (HARQ) process can have four redundancy versions, which are 0, 1, 2, and 3. When the terminal device first transmits a HARQ process, it first transmits the redundancy version 0 of the HARQ process. If the terminal device transmits the redundancy version 0 and receives the ACK fed back by the network device, it indicates that the uplink data that the terminal device needs to transmit is correctly received, so the remaining redundancy version is not transmitted. If the terminal device transmits the redundancy version 0 and receives the NACK fed back by the network device, it indicates that the uplink data that the terminal device needs to transmit is not correctly received. In this case, it is necessary to continue to transmit other redundancy versions of the HARQ process, such as redundancy version 2. Then there is redundancy version 3, and finally redundancy version 1 (a typical redundancy version transmission sequence is 0-2-3-1), so transmitting different redundancy versions can be considered a classic HARQ retransmission. However, in eMTC, the redundancy version of each HARQ process itself can be configured for repeated transmission (for example, HARQ redundancy version 0 can be repeatedly transmitted 128 times), where the repeated transmission is not HARQ retransmission.

For the terminal device, the transmission feedback of the first DCI to the terminal device can be divided into two possibilities. One possibility is that the uplink data of the first DCI feedback terminal device is not correctly received. The terminal device that receives the uplink data incorrectly and retransmits the uplink data may include the following two situations:

The first case is: when the terminal device determines, according to the first DCI, that the network device does not correctly receive the first redundancy version of the HARQ process transmitted by the terminal device, if the terminal device determines the maximum number of transmissions to reach the first redundancy version, further And transmitting, according to the first indication information carried in the first DCI, a second redundancy version of the HARQ process, that is, HARQ retransmission. The transmission order of the second redundancy version is after the transmission order of the first redundancy version.

The second case is: when the terminal device determines, according to the first DCI, that the network device does not correctly receive the first redundancy version of the HARQ process transmitted by the terminal device, if the terminal device determines that the maximum number of transmissions of the first redundancy version is not reached, further And transmitting the first redundancy version of the HARQ process according to the first indication information carried in the first DCI.

Therefore, the first indication information in the embodiment of the present application may be used to indicate that the same redundancy version is repeatedly transmitted, and may also be used for HARQ retransmission.

Another possibility is that the uplink data of the first DCI feedback terminal device is correctly received. The terminal device determines, according to the first DCI, that the network device correctly receives the first redundancy version of the HARQ process of the transmission of the terminal device, and the terminal device stops the HARQ process even if the number of repeated transmissions of the redundancy version does not reach the configured number of repeated transmissions. The remaining duplicate transmissions of the first redundancy version, and no other redundancy versions of the HARQ process need to be sent.

Uplink transmission of terminal equipment may require the use of multiple HARQ processes. The terminal device determines, according to the first DCI, that the network device correctly receives the uplink data sent by the first terminal device. If the terminal device determines that the HARQ process corresponding to the uplink data is not the last HARQ process of the uplink transmission of the terminal device, the terminal device may continue to monitor the physical downlink channel to obtain the second DCI for scheduling the uplink transmission, where the second DCI is the scheduled uplink transmission or scheduling. Downstream transmission DCI. The physical downlink channel may be a machine physical downlink control channel MPDCCH. Hereinafter, the MPDCCH will be described as an example.

If the terminal device determines that the HARQ process corresponding to the uplink data is the last HARQ process transmitted by the terminal device, the terminal device may stop listening to the MPDCCH or enter an idle state.

Therefore, in a possible design, the first DCI further carries the second indication information, where the second indication information is used to indicate that one or more of the N terminal devices end detecting the physical downlink control channel, or indicate the One or more of the N terminal devices enter an idle state.

It should be understood that, when the terminal device determines that the HARQ process corresponding to the correctly received uplink data is the last HARQ process of the terminal device uplink transmission, the terminal device stops listening to the MPDCCH according to the second indication information, or enters an idle state. However, when the terminal device determines that the HARQ process corresponding to the correctly received uplink data is not the last HARQ process of the terminal device uplink transmission, the terminal device may stop listening to the MPDCCH according to the second indication information, or enter an idle state. For example, when the network device needs to receive the uplink data sent by the terminal device, the network device may carry the second indication information in the first DCI that is sent, regardless of the uplink data corresponding to the terminal device. Whether the HARQ process is the last HARQ process of the uplink transmission of the terminal device, and the terminal device stops listening to the MPDCCH according to the second indication information, or enters an idle state.

In a possible design, each of the bit groups includes a second indication information, where the second indication information in the i-th bit group is used to indicate that the i-th terminal device ends detecting the MPDCCH or enters an idle state.

As shown in FIG. 3, the ith bit group includes 2 bits indicating whether the network device correctly receives the uplink data sent by the ith terminal device, and further includes 1-bit second indication information, indicating that the ith terminal device ends. Detect MPDCCH or enter idle state. For example, the bit is “0”, and the i-th terminal device ends detecting the MPDCCH, and the bit is “1”, and the i-th terminal device continues to detect the MPDCCH. Alternatively, the bit is “0”, which means that the i th terminal device enters an idle state, and the bit is “1”, which means that the i th terminal device is maintained in the connected state.

In another possible design, the second indication information is public information in the first DCI, and there is only one second indication information in the first DCI. As shown in FIG. 4, the field of the second indication information occupies 1 bit after the Mth bit group. At this time, the second indication information may simultaneously indicate that multiple terminal devices end detecting the MPDCCH, or enter an idle state. For example, the second indication information indicates that one or more terminal devices whose uplink data corresponding to the last HARQ process in the first feedback group is correctly received ends detecting the MPDCCH, or enters an idle state.

Before step 210, in one possible design, the network device sends a Radio Network Temporary Identifier (RNTI) to the N terminal devices.

The RNTI is used to indicate a scrambling code of a Cyclic Redundancy Check (CRC) of the first DCI.

In a possible design, the network device sends the domain information corresponding to each terminal device to the N terminal devices.

The domain information can be field information, or an information element.

It should be understood that the network device sending the domain information corresponding to each terminal device to the N terminal devices may include, but is not limited to, the following two situations:

The first case: the network device sends the domain information corresponding to the terminal device to each terminal device.

In the second case, the network device sends domain information corresponding to the plurality of terminal devices including the domain information corresponding to the terminal device to each terminal device.

The domain information corresponding to the i th terminal device is used to indicate the location of the i th bit group in the first DCI.

Therefore, the terminal device can detect the first DCI carried by the MPDCCH according to the group RNTI of the first feedback group. The terminal device may determine, according to the received domain information corresponding to the terminal device, a location of the bit group corresponding to the terminal device in the first DCI, and determine, by the bit group corresponding to the terminal device, whether the network device correctly receives the terminal device. The uplink data sent.

In one possible design, M is the maximum number of terminal devices belonging to the first feedback group. M ≥ N, M is a positive integer.

It should be understood that the maximum number of terminal devices included in the first feedback group is M. Therefore, the first DCI can simultaneously feed back the M terminal devices, and the first DCI can include at most M bit groups. In the embodiment shown in FIG. 2, it is assumed that N terminal devices send uplink data to the network device, N≤M. At this time, there are N bit groups corresponding to N terminal devices for feedback, and the first DCI feeds back the network device. Whether the uplink data sent by the N terminal devices is correctly received.

For example, the first feedback group includes a total of 10 terminal devices, and 6 of the terminal devices send uplink data to the network device. Therefore, the first DCI performs feedback for the six terminal devices, and the six bit groups corresponding to the six terminal devices participate in the feedback. The six terminal devices receive the first DCI sent by the network device, and each of the six terminal devices can determine, according to the bit group corresponding to the terminal device, whether the network device correctly receives the uplink data sent by the terminal device.

In a possible design, the ith bit group is used to indicate whether the network device correctly receives the uplink data sent by the ith terminal device. For the terminal device working in the CE Mode B, there are two HARQ processes. , can be used but not limited to the following two situations:

In the first case, the i-th bit group indicates whether the uplink data corresponding to the two HARQ processes corresponding to the i-th terminal device is correctly received.

Assume that the i-th bit group includes 2 bits, as shown in FIG. 5 is one of the schematic diagrams of M domains, UE1 corresponds to Field0, Field0 includes 2 bits, 1 bit indicates whether HARQ#0 is correctly received, and 1 bit indicates HARQ#. 1 Is it received correctly? Generally, the terminal device transmits uplink data to the network device using one HARQ process, and therefore, only 1 bit participates in the feedback. The second bit of the 2 bits of Field 1 in FIG. 3 is "0", and the transmission of HARQ #1 representing UE2 has been correctly demodulated.

The second case is: whether the HARQ process index corresponding to the uplink data sent by the i-th bit group of the i-th bit group and the uplink data corresponding to the HARQ process index are correctly received.

Assume that the i-th bit group includes 2 bits, as shown in FIG. 6 is a schematic diagram of M domains. UE1 corresponds to Field0, Field0 includes 2 bits, 1 bit indicates that UE1 transmits HARQ corresponding to uplink data, and another bit indicates UE1. Whether the HARQ corresponding to the uplink data is correctly received. For example, if the HARQ corresponding to the uplink data sent by the UE1 is HARQ#1, the other bit indicates whether the HARQ#1 is correctly received.

It should be understood that the above i-th bit group including 2 bits or including 3 bits is only an example and is not limited by the present application. The number of bits included in each bit group may also be other values, which is not limited in this application.

Therefore, compared with the prior art, the feedback information included in each DCI is only feedback information for one terminal device, and by using the foregoing method, the network device may send uplink data for multiple terminal devices in the first DCI. The feedback is correctly received, so that the feedback efficiency is effectively improved, and since only one first DCI needs to be sent for multiple terminal devices, the problem that the DCI occupying the feedback information occupies a large resource overhead is solved, and the resource overhead is reduced.

The following describes how to divide a plurality of terminal devices into feedback groups in the embodiment of the present application.

In a possible design, the second DCI of each of the N terminal devices has a payload size of K bits, and the second DCI is used to schedule terminal device specific uplink transmissions for the terminal device or Downstream transmission, K is a positive integer.

For a terminal device operating in CE Mode B, its physical uplink shared channel (PUSCH) transmission is scheduled by DCI format 6-0B, and its physical downlink shared channel is scheduled by DCI format 6-1B ( Physical Downlink Shared Channel, PDSCH). In the embodiment of the present application, the second DCI refers to DCI format 6-0B or DCI format 6-1B.

Therefore, the network device can use the same load size of the second DCI as the terminal device grouping rule. For example, the number of terminal devices with the second DCI payload size of 21 bits in the current cell is 10, and the network device can use the 10 terminal devices as the A feedback group, or, divide the 10 terminal devices into two feedback groups.

Specifically, for different terminal devices, the information bits of the DCI format 6-0B and the information bits of the DCI format 6-1B may also be different due to different high-level signaling configurations of the respective terminal devices, as shown in Table 1 below:

Table 1

As can be seen from Table 1, the number of information bits of the DCI may change when the system bandwidth is different, and for the DCI format 6-1B, the number of information bits is also affected by the high-level parameter "ce-pdsch-maxBandwidth-config": If the parameter is not configured for the terminal device, the PDSCH bandwidth of the terminal device is 1.4 MHz. If the parameter is configured for the terminal device and the configuration is 5 MHz, the PDSCH bandwidth of the terminal device is 5 MHz. If the parameter is configured for the terminal device and the configuration is 20 MHz, Then, the PDSCH bandwidth of the terminal device is 20 MHz. When the terminal device has different PDSCH bandwidths, the number of information bits of DCI format 6-1B may change, as shown in [x/y/z] in Table 1.

In order to reduce the blind detection complexity of the terminal device, the existing standard specifies that if the information bit of the DCI format 6-0B If the number is less than the load size of DCI format 6-1B, it will be filled with 0 in DCI format 6-0B until the load size of the two is the same. Vice versa, if the number of information bits in DCI format 6-1B is less than the payload size of DCI format 6-0B, it will be filled with 0 in DCI format 6-1B until the size of the two is the same. In this way, the terminal device only needs to blindly detect the DCI of one payload size.

In addition, in Rel-15, resource allocation of less than one physical resource block (PRB) granularity (sub-PRB) can be supported for PUSCH transmission. In order to achieve fine-grained resource allocation, X bits are additionally introduced in DCI format 6-0B (for example, X is one of {1, 2, 3}), and the capability of the terminal device to support sub-PRB is The configured, that is, the terminal information of the DCI format 6-0B of the terminal device may be more than X bits, and some terminal devices may not have more than X bits. This results in a change in the column of DCI format 6-0B in Table 1 as shown in Table 2 below, ie in the DCI format 6-0B column +X.

Table 2

It can be seen that the payload size of DCI format 6-0B and the payload size of DCI format 6-1B may be different for each terminal device.

Similarly, in order to reduce the blind detection complexity of the terminal device, if the number of information bits of the DCI format 6-0B is smaller than the load size of the DCI format 6-1B, the DCI format 6-0B is filled with 0 until the load of the two is loaded. The same size. Vice versa, if the number of information bits in DCI format 6-1B is less than the payload size of DCI format 6-0B, it will be filled with 0 in DCI format 6-1B until the load size of the two is the same. In this way, the terminal device only needs to blindly detect the DCI of one payload size.

In one possible design, the load size of the first DCI is the same as the load size of the second DCI. This design can reduce the blind detection complexity of the terminal device.

The following tables give a list of possible end device groupings when X=2. It should be noted that X=2 is not limited to the present application, and when X is other values, the same method can be used.

Table 3 is a list of the number of information bits of DCI format 6-0B and the number of information bits of DCI format 6-1B at different system bandwidths when X=2.

table 3

Table 4

table 5

Table 6

Among them, different letters A, B, and C indicate different feedback groups. Table 4 shows when the system bandwidth is 1.4MHz or system The grouping of terminal devices when the width is 3MHz. Table 5 shows the grouping of terminal devices when the system bandwidth is 5 MHz. Table 6 shows the grouping of terminal devices when the system bandwidth is 10 MHz or the system bandwidth is 15 MHz or the system bandwidth is 20 MHz.

Table 6 corresponding to the system bandwidth = 10 MHz is used as an example. As shown in Table 6, the terminal device configured with the sub-PRB resource allocation and the terminal device not configured with the sub-PRB resource allocation but with the PDSCH bandwidth of 20 MHz can be divided into the same feedback. Group (A), because, as can be seen from Table 3, when the system bandwidth = 10 MHz, the number of information bits of the DCI format 6-0B of the terminal device configured with the sub-PRB resource allocation is 20 bits, and the different PDSCH bandwidths [1.4M/5M] The number of information bits of the DCI format 6-1B corresponding to the terminal device of the /20M]Hz is 18bits/19bits/20bits, so the load of the second DCI of the terminal device configured with the sub-PRB resource allocation after the 0-fill operation is 20bits. . When the system bandwidth is 10 MHz, the number of information bits of the DCI format 6-0B of the terminal device that does not configure the sub-PRB resource allocation is 18 bits, and the number of information bits of the DCI format 6-1B of the terminal device with the PDSCH bandwidth of 20 MHz is 20 bits. The load size of the second DCI of the terminal device that does not configure the sub-PRB resource allocation and the PDSCH bandwidth is 20 MHz after the zero-fill operation is 20 bits. Therefore, in the above two cases, the load of the second DCI of the terminal device is the same, both being 20 bits. At this time, the load of the first DCI is also 20 bits.

Similarly, in Table 6, the terminal devices that do not have the sub-PRB resource allocation and the PDSCH bandwidth of 1.4 MHz can be divided into the same feedback group (B). At this time, the size of the first DCI is also 18 bits. A terminal device that does not configure sub-PRB resource allocation and has a PDSCH bandwidth of 5 MHz may be divided into the same feedback group (C). At this time, the size of the first DCI is 19 bits.

In the following, UE1 divides the feedback group and the process of using the first DCI for feedback for the sake of explanation.

After the UE1 accesses the network device, the UE1 can report to the network device that it has the capability of receiving group feedback, that is, the UE1 can detect and demodulate the first DCI. The network device can divide the UE1 into one feedback group according to the information. In addition, UE1 can also report whether it supports sub-PRB resource allocation, and the network device can configure sub-PRB resource allocation for UE1 accordingly. Specifically, the network device may determine the load size of the DCI format 6-0B or the DCI format 6-1B of the UE1 according to the system bandwidth, the high-level parameter configuration of the UE1 (the maximum PDSCH bandwidth, and the sub-PRB resource allocation). Since the load sizes of DCI format 6-0B and DCI format 6-1B are the same, the following is an example of DCI format 6-0B. Assume that the DCI format 6-0B has a payload size of 20 bits.

Further, the network device determines another UE with the same payload size as the DCI format 6-0B of the UE1. For example, the payload size of the DCI format 6-0B of the UE5 is also 20 bits, and the payload size of the DCI format 6-0B of the UE8 is also 20bits.

Therefore, the network device can use UE1, UE5, and UE8 as one feedback group A. The payload size of the first DCI is also 20 bits.

The network device sends the RNTI of the feedback group A to the UE, and the domain information of the UE1.

It should be understood that if UE5 and UE8 access the network device before UE1, the network device may have UE5 and UE8 as a feedback group. At this time, UE1 joins an existing feedback group, or accesses the network at UE1. After the device, the network device uses UE1, UE5, and UE8 as a feedback group, and feedback group A is a new feedback group. Or, after the UE2 accesses the network device, if the payload size of the DCI format 6-0B of the UE2 is also 20 bits, the network device may add the UE2 to the feedback group A, or join another existing feedback group or add a feedback group. This application does not limit this.

When the feedback group A includes UE1, UE5, and UE8, it is assumed that both UE1 and UE8 work in CE Mode B, and send uplink data to the network device respectively. The network device determines that the uplink data sent by the UE1 is correctly received, and the uplink data sent by the UE8 is not correctly received, and the network device sends the first DCI, where the first DCI includes the bit group corresponding to the UE1 and the bit group corresponding to the UE8, where the UE1 corresponds to The bit group indicates that the network device correctly receives the uplink data sent by the UE1, and the bit group corresponding to the UE8 indicates that the network device does not correctly receive the uplink data sent by the UE8.

The UE1 receives the first DCI according to the RNTI of the feedback group A, and locates the first DCI according to the domain information of the UE1. The position of the bit group corresponding to the UE1 is read, and the bit group corresponding to the UE1 is read to determine that the network device correctly receives the uplink data sent by the UE1.

Therefore, if the prior art solution is adopted, the network device needs to send two DCIs, one DCI is sent to the UE1 to instruct the network device to correctly receive the uplink data sent by the UE1, and one DCI is sent to the UE8 to indicate that the network device does not correctly receive the uplink data sent by the UE8. . Therefore, the two DCIs need to occupy two MPDCCH resources, and the method provided by the embodiment of the present application, the network device sends the first DCI, and only needs to occupy one MPDCCH resource, which reduces resource overhead and improves feedback efficiency.

Based on the above embodiment, the embodiment of the present application provides a feedback device, corresponding to the network device in the embodiment shown in FIG. 3, as shown in FIG. 7, the device 700 includes:

The processing unit 701 is configured to determine first downlink control information DCI, where the first DCI includes N bit groups, the N bit groups correspond to N terminal devices, and the N terminal devices work in a coverage enhancement mode. a mode B, wherein the i-th bit group in the first DCI is used to indicate whether the device correctly receives uplink data sent by the i-th terminal device, where i≤N, i and N are positive integers;

The transceiver unit 702 is configured to send the first DCI.

In a possible design, the second DCI of each of the N terminal devices has a payload size of K bits, and the second DCI is used to schedule terminal device specific uplink transmissions for the terminal device or Downstream transmission, K is a positive integer.

In one possible design, the load size of the first DCI is the same as the load size of the second DCI.

In a possible design, each of the N terminal devices sends the uplink data to occupy Q subcarriers, where Q is a positive integer less than 12; or

The channel bandwidth of each of the N terminal devices is 1.4 MHz; or

The maximum bandwidth configuration of the coverage enhanced physical downlink shared channel configured by the device 700 for each of the N terminal devices is 5 MHz; or

The coverage enhanced physical downlink shared channel maximum bandwidth configuration configured by the apparatus 700 for each of the N terminal devices is 20 MHz.

In a possible design, before the sending and receiving unit 702 sends the first DCI, the transceiver unit 702 is further configured to send the wireless network temporary identifier information RNTI to the N terminal devices; The RNTI is used to indicate a scrambling code of the cyclic redundancy check CRC of the first DCI.

In a possible design, before the sending and receiving unit 702 sends the first DCI, the transceiver unit 702 is further configured to send domain information corresponding to each terminal device to the N terminal devices;

The domain information corresponding to the ith terminal device is used to indicate the location of the ith bit group in the first DCI.

In a possible design, the ith bit group is used to indicate whether the device correctly receives the uplink data sent by the ith terminal device, including: the ith bit group indicating the ith terminal device corresponding to Whether the uplink data corresponding to the two HARQ processes is correctly received; or the ith bit group indicates whether the HARQ process index corresponding to the uplink data sent by the ith terminal device and the uplink data corresponding to the HARQ process index are correctly received .

In a possible design, the first DCI further carries first indication information, where the first indication information is used to indicate that one or more of the N terminal devices retransmit uplink data.

In a possible design, the first DCI further carries second indication information, where the second indication information is used to refer to One or more of the N terminal devices are shown to end detecting the physical downlink control channel or instructing one or more of the N terminal devices to enter an idle state.

Based on the above embodiment, the embodiment of the present application provides a feedback device, which corresponds to the first terminal device or the second terminal device in the embodiment shown in FIG. 3. As shown in FIG. 8, the device 800 includes:

The sending unit 801 is configured to send uplink data to the network device.

The receiving unit 802 is configured to receive the first DCI, where the first DCI includes N bit groups, the N bit groups correspond to N terminal devices, and the N terminal devices work in the coverage enhancement mode CE Mode B, The i-th bit group in the first DCI is used to indicate whether the network device correctly receives the uplink data sent by the i-th terminal device, where i≤N, i and N are positive integers; the N terminal devices The device is included.

In a possible design, the second DCI of each of the N terminal devices has a payload size of K bits, and the second DCI is used to schedule terminal device specific uplink transmissions for the terminal device or Downstream transmission, K is a positive integer.

In one possible design, the load size of the first DCI is the same as the load size of the second DCI.

In a possible design, before the receiving unit 802 receives the first DCI sent by the network device, the receiving unit 802 is further configured to receive the RNTI sent by the network device, where the The RNTI is used to indicate a scrambling code of the cyclic redundancy check CRC of the first DCI.

In a possible design, before the receiving unit 802 receives the first DCI sent by the network device, the receiving unit 802 is further configured to receive domain information corresponding to the device sent by the network device; The domain information corresponding to the device is used to indicate a location of a bit group corresponding to the device in the first DCI.

In a possible design, the ith bit group is used to indicate whether the network device correctly receives the uplink data sent by the ith terminal device, where the ith bit group indicates that the ith terminal device corresponds to Whether the uplink data corresponding to the two HARQ processes is correctly received; or the i-th bit group indicates whether the HARQ process index corresponding to the uplink data sent by the ith terminal device and the uplink data corresponding to the HARQ process index are correct receive.

In a possible design, the first DCI further carries first indication information, where the first indication information is used to indicate that one or more of the N terminal devices retransmit uplink data.

In a possible design, the first DCI further carries the second indication information, where the second indication information is used to indicate that one or more of the N terminal devices end detecting the physical downlink control channel or Instructing one or more of the N terminal devices to enter an idle state.

It should be understood that the division of each unit above is only a division of logical functions, and the actual implementation may be integrated into one physical entity in whole or in part, or may be physically separated. Moreover, these units may all be implemented in the form of software by means of processing component calls; or may be implemented entirely in hardware; some units may be implemented in software in the form of processing component calls, and some units may be implemented in hardware. For example, the processing unit may be a separately set processing element, or may be integrated in a certain chip. Alternatively, it may be stored in a memory in the form of a program, and a function of the unit is called and executed by a certain processing element. The implementation of other units is similar. In addition, all or part of these units can be integrated or implemented independently. The processing elements described herein can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above units may be completed by an integrated logic circuit of hardware in the processor element or an instruction in a form of software.

Based on the above embodiment, referring to FIG. 9, the embodiment of the present application further provides a network device 900, which corresponds to the network device in the embodiment shown in FIG. 3, and the network device 900 includes: a transceiver 901, a processor 902, and a memory. 903. It can be understood that the feedback device in the embodiment shown in FIG. 7 above can be implemented by the network device 900 shown in FIG. Network equipment The structure of 900 does not constitute a limitation on the embodiments of the present application.

The memory 903 is configured to store computer program code. The memory 903 may include a random access memory (RAM), etc., and may also include a non-volatile memory, such as at least one disk storage. The processor 1002 may be a central processing unit (CPU), a network processor (NP), a hardware chip, or any combination thereof. The processor 1002 executes the computer program code stored in the memory 1003 to implement the method as shown in FIG. For specific implementation steps, refer to the foregoing method embodiments, which are not described herein.

Based on the above embodiment, referring to FIG. 10, the embodiment of the present application further provides a terminal device 1000, for example, a first terminal device or a second terminal device in the embodiment shown in FIG. 3, the terminal device 1000 includes: a transceiver 1001, processor 1002, memory 1003. It can be understood that the feedback device in the above embodiment shown in FIG. 8 can be implemented by the terminal device 1000 shown in FIG. Specifically, the receiving unit 802 and the sending unit 801 in FIG. 8 can be implemented by the transceiver 1001. The structure of the terminal device 1000 does not limit the embodiment of the present application.

The memory 1003 is configured to store computer program code. The memory 1003 may include a random access memory (RAM), etc., and may also include a non-volatile memory, such as at least one disk storage. The processor 1002 may be a central processing unit (CPU), a network processor (NP), a hardware chip, or any combination thereof. The processor 1002 executes the computer program code stored in the memory 1003 to implement the method as shown in FIG. For specific implementation steps, refer to the foregoing method embodiments, which are not described herein.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, embodiments of the present application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The specific embodiments of the present invention have been described in detail with reference to the specific embodiments of the present application. It is to be understood that the foregoing description is only The scope of protection, any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application are included in the scope of protection of the present application.

Claims (30)

A feedback method, characterized in that the method comprises: The network device determines the first downlink control information DCI, the first DCI includes N bit groups, the N bit groups correspond to N terminal devices, and the N terminal devices work in the coverage enhancement mode CE Mode B, The i-th bit group in the first DCI is used to indicate whether the network device correctly receives the uplink data sent by the i-th terminal device, where i≤N, i and N are positive integers; The network device sends the first DCI. The method according to claim 1, wherein a load size of a second DCI of each of the N terminal devices is K bits, and the second DCI is used to schedule a terminal device for the terminal device. For a particular upstream or downstream transmission, K is a positive integer. The method of claim 1 wherein The resources occupied by each of the N terminal devices to send the uplink data are Q subcarriers, where Q is a positive integer less than 12; or The channel bandwidth of each of the N terminal devices is 1.4 MHz; or The coverage enhanced physical downlink shared channel maximum bandwidth configuration configured by the network device for each of the N terminal devices is 5 MHz; or The coverage enhanced physical downlink shared channel maximum bandwidth configuration configured by the network device for each of the N terminal devices is 20 MHz. The method according to any one of claims 1 to 3, wherein the load size of the first DCI is the same as the load size of the second DCI. The method according to any one of claims 1 to 4, further comprising: Transmitting, by the network device, domain information corresponding to each terminal device to the N terminal devices; The domain information corresponding to the ith terminal device is used to indicate the location of the ith bit group in the first DCI. The method according to any one of claims 1-5, wherein the ith bit group is used to indicate whether the network device correctly receives the uplink data sent by the ith terminal device, including: The ith bit group indicates whether the uplink data corresponding to the two HARQ processes of the ith terminal device is correctly received; Or the ith bit group indicates whether the HARQ process index corresponding to the uplink data sent by the ith terminal device and the uplink data corresponding to the HARQ process index are correctly received. The method according to any one of claims 1-6, wherein the first DCI further carries first indication information, where the first indication information is used to indicate one or more of the N terminal devices. The terminal device resends the uplink data. The method according to any one of claims 1 to 7, wherein the first DCI further carries second indication information, and the second indication information is used to indicate one or more of the N terminal devices. The terminal devices end detecting the physical downlink control channel or instructing one or more of the N terminal devices to enter an idle state. A feedback method, characterized in that the method comprises: The first terminal device sends uplink data to the network device; The first terminal device receives the first DCI; The first DCI includes N bit groups, the N bit groups correspond to N terminal devices, and the N terminal devices operate in a coverage enhancement mode CE Mode B, where the i th in the first DCI The bit group is used to indicate whether the network device correctly receives the uplink data sent by the ith terminal device, i ≤ N, i and N are positive integers; the N terminal devices include the first terminal device. The method according to claim 9, wherein a load size of a second DCI of each of the N terminal devices is K bits, and the second DCI is used to schedule a terminal device for the terminal device. For a particular upstream or downstream transmission, K is a positive integer. The method of claim 10 wherein the load size of the first DCI is the same as the load size of the second DCI. The method according to any one of claims 9 to 11, wherein before the first terminal device receives the first DCI sent by the network device, the method further includes: Receiving, by the first terminal device, domain information corresponding to the first terminal device that is sent by the network device; The domain information corresponding to the first terminal device is used to indicate a location of the bit group corresponding to the first terminal device in the first DCI. The method according to any one of claims 9 to 12, wherein the ith bit group is used to indicate whether the network device correctly receives the uplink data sent by the ith terminal device, including: The ith bit group indicates whether the uplink data corresponding to the two HARQ processes of the ith terminal device is correctly received; Or the ith bit group indicates the HARQ process index corresponding to the uplink data sent by the ith terminal device and the uplink data corresponding to the HARQ process index is correctly received. The method according to any one of claims 9 to 13, wherein the first DCI further carries first indication information, where the first indication information is used to indicate one or more of the N terminal devices. The terminal device resends the uplink data. The method according to any one of claims 9 to 14, wherein the first DCI further carries second indication information, where the second indication information is used to indicate one or more of the N terminal devices. The terminal devices end detecting the physical downlink control channel or instructing one or more of the N terminal devices to enter an idle state. A feedback device, comprising: a processing unit, configured to determine first downlink control information DCI, where the first DCI includes N bit groups, the N bit groups correspond to N terminal devices, and the N terminal devices work in a coverage enhancement mode CE Mode B, wherein the i-th bit group in the first DCI is used to indicate whether the device correctly receives uplink data sent by the i-th terminal device, where i≤N, i and N are positive integers; And a transceiver unit, configured to send the first DCI. The apparatus according to claim 16, wherein a load size of a second DCI of each of the N terminal devices is K bits, and the second DCI is used to schedule a terminal device for the terminal device For a particular upstream or downstream transmission, K is a positive integer. The device according to any one of claims 16-17, wherein each of the N terminal devices sends the uplink data to occupy Q subcarriers, where Q is less than 12. Positive integer; or, The channel bandwidth of each of the N terminal devices is 1.4 MHz; or The maximum bandwidth configuration of the coverage enhanced physical downlink shared channel configured by the device for each of the N terminal devices is 5 MHz; or The coverage enhanced physical downlink shared channel maximum bandwidth configuration configured by the apparatus for each of the N terminal devices is 20 MHz. The apparatus according to any one of claims 16-18, wherein the load size of the first DCI is the same as the load size of the second DCI. The device according to any one of claims 16 to 19, wherein before the transmitting and receiving unit sends the first DCI, the transceiver unit is further configured to send each terminal to the N terminal devices. Domain information corresponding to the device; The domain information corresponding to the ith terminal device is used to indicate the location of the ith bit group in the first DCI. The device according to any one of claims 16 to 20, wherein the ith bit group is used to indicate whether the device correctly receives the uplink data sent by the ith terminal device, including: the ith bit The group indicates whether the uplink data corresponding to the two HARQ processes corresponding to the ith terminal device is correctly received; or the ith bit group indicates the HARQ process index corresponding to the uplink data sent by the ith terminal device, and the Whether the uplink data corresponding to the HARQ process index is correctly received. The device according to any one of claims 16 to 21, wherein the first DCI further carries first indication information, where the first indication information is used to indicate one or more of the N terminal devices. The terminal device resends the uplink data. The device according to any one of claims 16 to 22, wherein the first DCI further carries second indication information, where the second indication information is used to indicate one or more of the N terminal devices. The terminal devices end detecting the physical downlink control channel or instructing one or more of the N terminal devices to enter an idle state. A feedback device, comprising: a sending unit, configured to send uplink data to the network device; a receiving unit, configured to receive a first DCI; the first DCI includes N bit groups, the N bit groups correspond to N terminal devices, and the N terminal devices operate in a coverage enhancement mode CE Mode B, where The i-th bit group in the first DCI is used to indicate whether the network device correctly receives the uplink data sent by the i-th terminal device, where i≤N, i and N are positive integers; in the N terminal devices The device is included. The apparatus according to claim 24, wherein a load size of a second DCI of each of the N terminal devices is K bits, and the second DCI is used to schedule a terminal device for the terminal device For a particular upstream or downstream transmission, K is a positive integer. The apparatus according to claim 25, wherein a load size of said first DCI is the same as a load size of said second DCI. The device according to any one of claims 24 to 26, wherein before the receiving unit receives the first DCI sent by the network device, the receiving unit is further configured to receive the sending by the network device The domain information corresponding to the device, where the domain information corresponding to the device is used to indicate the location of the bit group corresponding to the device in the first DCI. The device according to any one of claims 24 to 27, wherein the i-th bit group is used to indicate whether the network device correctly receives uplink data sent by the i-th terminal device, including: the i-th bit The bit group indicates whether the uplink data corresponding to the two HARQ processes corresponding to the ith terminal device is correctly received; or the ith bit group indicates the HARQ process index and the corresponding uplink data sent by the ith terminal device Whether the uplink data corresponding to the HARQ process index is correctly received. The apparatus according to any one of claims 24 to 28, wherein the first DCI further carries a first indication The first indication information is used to indicate that one or more of the N terminal devices retransmit the uplink data. The device according to any one of claims 24 to 29, wherein the first DCI further carries second indication information, where the second indication information is used to indicate one or more of the N terminal devices. The terminal devices end detecting the physical downlink control channel or instructing one or more of the N terminal devices to enter an idle state.

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