A communication method and apparatus

Abstract

A communication method and apparatus, comprising: a first network device generates first indication information, the first indication information is used to indicate a first downlink resource, and whether there is a second indication information in a first time unit, the second indication information is used to indicate the second downlink resource; the first downlink resource and the second downlink resource are used to carry downlink data; the first network device sends the first indication information in the first time unit. Since the first indication information can be used to indicate whether there is the second indication information, if the terminal device detects the first indication information in the first time unit, and the first indication information indicates that there is no second indication information in the first time unit, then the terminal device can terminate the blind detection process of the second indication information in advance, thereby effectively reducing the blind detection complexity of the terminal device, supporting the terminal device to perform fast PDSCH demodulation, and avoiding the technical problem of high power consumption caused by always blindly detecting two indication information in the prior art.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on September 14, 2018, with application number 201811072500.0 and application name “A Communication Method and Device”, the entire contents of which are incorporated by reference in this application. Technical Field

[0002] The present invention relates to the field of wireless communication technology, and in particular to a communication method and device. Background Art

[0003] In the downlink transmission of the new radio access technology (NR) system of the 3rd generation partnership project (3GPP), the user equipment (UE) can use the coordinated multiple points transmission / reception (CoMP) mode to communicate with multiple network devices (such as base stations) at the same time. These multiple network devices form a collaboration set, and the network devices in the collaboration set can exchange collaboration strategy information to achieve the purpose of collaborative transmission.

[0004] There may be a serving base station in the collaborative set, which is used to make scheduling decisions for data communication with the UE, determine the time-frequency resources of the control channel and data channel of the UE based on the scheduling decision, and send downlink control information (DCI) in the physical downlink control channel (PDCCH), send data in the physical uplink shared channel (PUSCH) / physical downlink shared channel (PDSCH), etc. The remaining base stations in the collaborative set except the serving base station are called collaborative base stations, which are used to communicate with the UE according to the scheduling decision of the serving base station, such as sending DCI in the PDCCH and sending data in the PUSCH / PDSCH according to the scheduling decision of the serving base station. The base station transmits downlink data in the PDSCH in the form of codewords, each codeword corresponds to an independent modulation and coding method, and each codeword corresponds to an independent data transmission layer.

[0005] In CoMP transmission mode, PDSCH scheduling can use one DCI indication or two DCI indications. If PDSCH scheduling uses one DCI indication, such asFigure 1 As shown, the base station on the left can act as a serving base station to make scheduling decisions for the UE and send DCI, which may include a time-frequency resource allocation indication and a transmission mode indication for downlink data modulated and coded in the form of one codeword or two codewords. If the PDSCH is scheduled using two DCI indications, such as Figure 2 As shown, two base stations may respectively send a DCI, and each DCI corresponds to a time-frequency resource allocation indication and a transmission mode indication of at least one codeword.

[0006] At present, when scheduling PDSCH, the base station does not inform the UE of the number of DCIs used for scheduling PDSCH, so the UE always needs to blindly detect two DCIs until the maximum number of blind detections is reached, thereby increasing the complexity of UE blind detection and the power consumption of blind detection of DCI. Therefore, how to reduce the complexity of UE blind detection of DCI is an urgent problem to be solved. Summary of the invention

[0007] The embodiments of the present application provide a communication method and apparatus for enabling a terminal device to terminate unnecessary blind detection processes in advance, thereby reducing the blind detection complexity and detection power consumption of the terminal device.

[0008] In a first aspect, an embodiment of the present application provides a communication method, which includes: a first network device generates first indication information; the first indication information is used to indicate a first downlink resource, and whether second indication information exists within a first time unit, and the second indication information is used to indicate a second downlink resource; the first downlink resource and the second downlink resource are used to carry downlink data; the first network device sends the first indication information within the first time unit.

[0009] In a second aspect, an embodiment of the present application provides another communication method, which includes: a terminal device detects first indication information in a first time unit; the first indication information is used to indicate a first downlink resource, and whether second indication information exists in the first time unit, and the second indication information is used to indicate a second downlink resource; the first downlink resource and the second downlink resource are used to carry downlink data; if the terminal device detects that the first indication information indicates that the second indication information does not exist in the first time unit, the terminal device stops detecting the second indication information in the first time unit.

[0010] From this, it can be seen that since the first indication information sent by the first network device to the terminal device within the first time unit can be used to indicate whether the second indication information exists within the first time unit, therefore, when the terminal device detects the first indication information, if the first indication information indicates that the second indication information does not exist within the first time unit, then the terminal device can terminate the blind detection process for the second indication information in advance, thereby effectively reducing the blind detection complexity of the terminal device, supporting the terminal device to perform fast PDSCH demodulation, and avoiding the technical problem of high power consumption caused by always blindly detecting two indication information in the prior art.

[0011] In one possible design, if the first indication information indicates that the second indication information exists within the first time unit, the first network device sends the second indication information within the first time unit; wherein the second indication information is used to indicate that the first indication information exists within the first time unit. Correspondingly, the terminal device also detects the second indication information within the first time unit.

[0012] In an embodiment of the present application, if the first network device sends the first indication information and the second indication information within the first time unit, then the first indication information will indicate that the second indication information exists in the first time unit, and correspondingly, the second indication information will also indicate that the first indication information exists in the first time unit. Since the order in which the UE blindly detects the first indication information and the second indication information is unknown to the network device, no matter which indication information of the first indication information and the second indication information is detected first by the terminal device, the indication information detected first can always indicate the existence of the other indication information, so as to prompt the terminal device to detect two indication information. In this way, the terminal device can terminate the detection of the second indication information in advance when the first indication information indicates that the second indication information does not exist, thereby reducing the actual number of blind detections.

[0013] For example, the terminal device detects the first indication information and the second indication information within the first time unit according to the search space configuration (SearchSpace) information of each of the first indication information and the second indication information. Assuming that the terminal device detects any one of the first indication information and the second indication information first, the terminal device can determine whether there is another indication information different from any one of the first indication information and the second indication information according to any one of the detected first indication information and the second indication information. When there is another indication information different from any one of the first indication information and the second indication information, the terminal device will continue the detection process of the indication information according to the corresponding search space configuration information. When there is no other indication information different from any one of the first indication information and the second indication information, the terminal device will stop the detection process of the indication information.

[0014] In the embodiment of the present application, the first indication information indicating "whether the second indication information exists within the first time unit" may have multiple possible implementations. In one possible implementation, the first indication information includes at least two codeword information fields, and each of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled; if all the codewords corresponding to the at least two codeword information fields in the first indication information are enabled, the first indication information is used to indicate that the second indication information does not exist; if part of the codewords corresponding to the at least two codeword information fields in the first indication information are enabled, the first indication information is used to indicate that the second indication information exists.

[0015] In this way, the presence of the second indication information within the first time unit can be indicated according to the activation status of the codeword corresponding to the codeword information field in the first indication information, thereby effectively avoiding additional signaling overhead caused by adding new fields in the indication information and reducing the blind detection complexity of the terminal device. At the same time, when the downlink data transmission adopts the transmission mode of a single base station transmitting two codewords, since only one DCI needs to be detected and decoded, there is no need to wait for complete detection and decoding to obtain the information carried by the two DCIs, thereby supporting the terminal device to perform fast data demodulation.

[0016] In another possible implementation, the first indication information includes a demodulation reference signal DMRS port indication field and at least two codeword information fields, and each of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled; if the codewords corresponding to the at least two codeword information fields in the first indication information are all enabled, and the state value of the DMRS port indication field is within a first preset range, then the first indication information is used to indicate the presence of the second indication information; if the codewords corresponding to the at least two codeword information fields in the first indication information are all enabled, and the state value of the DMRS port indication field is within a second preset range, then the first indication information is used to indicate that the second indication information does not exist; if some of the codewords corresponding to the at least two first codeword information fields in the first indication information are enabled, then the second indication information is used to indicate that the first indication information does not exist.

[0017] In this way, based on the activation status of the codeword corresponding to the codeword information field in the first indication information and the status value indicated by the DMRS port indication field, it is possible to indicate whether the second indication information exists within the first time unit, thereby effectively avoiding the additional signaling overhead caused by adding new fields in the indication information and reducing the blind detection complexity of the terminal device. At the same time, when the downlink data transmission adopts the transmission mode of a single base station transmitting two codewords, since only one DCI needs to be detected and decoded, there is no need to wait for complete detection and decoding to obtain the information carried by the two DCIs, thereby supporting the terminal device to perform fast data demodulation.

[0018] In one possible design, if all the codewords corresponding to the at least two codeword information fields are enabled, the number of DMRS ports corresponding to the status value of the DMRS port indication field within the first preset range is less than or equal to the first threshold value, and the number of DMRS ports corresponding to the status value of the DMRS port indication field within the second preset range is greater than the first threshold value, thereby supporting a transmission mode in which 1 DCI indicates that a single base station transmits 1 or 2 codewords and a transmission mode in which 2 DCIs indicate that two base stations transmit at least 2 codewords. In this way, only the transmission mode in which two base stations transmit at least 2 codewords requires the terminal device to perform blind detection of 2 DCIs, thereby reducing the blind detection complexity of the terminal device and supporting the terminal device to perform fast data demodulation, and the above transmission modes can be switched dynamically.

[0019] Further, if all the codewords corresponding to the at least two codeword information fields are enabled, the number of DMRS ports corresponding to the status value of the DMRS port indication field within the first preset range is less than or equal to the first threshold value, and the DMRS port number corresponding to the status value corresponds to the same CDM group.

[0020] In one possible design, each of the at least two codeword information fields includes: a modulation and coding strategy MCS field and a redundant version RV field; when the state value of the MCS field is within a third preset range and the state value of the RV field is within a fourth preset range, the codeword information field is used to indicate that the codeword corresponding to the codeword information field is not enabled, otherwise the codeword corresponding to the codeword information field is enabled.

[0021] In another possible implementation, if the mask of the cyclic redundancy check CRC bit corresponding to the first indication information is the first scrambling sequence, the first indication information is used to indicate the existence of the second indication information; if the mask of the CRC bit corresponding to the first indication information is the second scrambling sequence, the first indication information is used to indicate the absence of the second indication information. In this way, the mask of the CRC bit corresponding to the first indication information can be used to carry whether the second indication information exists within the first time unit, thereby effectively avoiding the additional signaling overhead caused by adding a new field in the indication information and reducing the blind detection complexity of the terminal device.

[0022] In another possible implementation, if the first indication information satisfies a first information format, then the first indication information can be used to indicate that the second indication information does not exist, and the first information format is a format with the least number of bits among multiple DCI formats used to schedule downlink data transmission; and / or, if the first indication information satisfies a second information format, then the first indication information can be used to indicate that the second indication information exists; and the second information format is a format with a larger number of bits than the first information format among multiple DCI formats used to schedule downlink data transmission. In this way, the information format satisfied by the first indication information can be used to indicate whether the second indication information exists within the first time unit, thereby effectively avoiding the additional signaling overhead caused by adding a new field in the indication information and reducing the blind detection complexity of the terminal device.

[0023] Similarly, in the embodiment of the present application, the second indication information indicating that "the first indication information exists in the first time unit" may have multiple possible implementation methods. In one possible implementation method, the second indication information includes at least two codeword information fields, and each of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled; if the codeword parts corresponding to at least two codeword information fields in the second indication information are enabled, then the second indication information is used to indicate the existence of the first indication information. In this way, the presence of the first indication information in the first time unit can be indicated according to the activation status of the codeword corresponding to the codeword information field in the second indication information, thereby effectively avoiding the additional signaling overhead caused by adding a new field in the indication information, reducing the blind detection complexity of the terminal device, and at the same time, when the downlink data transmission adopts the transmission mode of a single base station transmitting two codewords, since only one DCI needs to be detected and decoded, there is no need to wait for full detection and decoding to obtain the information carried by the two DCIs, thereby supporting the terminal device to perform fast data demodulation.

[0024] In another possible implementation, the second indication information includes a demodulation reference signal DMRS port indication field and at least two codeword information fields, each of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled; if the codewords corresponding to the at least two codeword information fields in the second indication information are all enabled, and the state value of the DMRS port indication field is within the first preset range, the second indication information is used to indicate the existence of the first indication information. In this way, the first indication information can be indicated to exist within the first time unit according to the enabling status of the codeword corresponding to the codeword information field in the second indication information, combined with the state value indicated by the DMRS port indication field, thereby effectively avoiding the additional signaling overhead caused by adding a new field in the indication information, reducing the blind detection complexity of the terminal device, and at the same time, when the downlink data transmission adopts the transmission mode of a single base station transmitting two codewords, since only one DCI needs to be detected and decoded, there is no need to wait for complete detection and decoding to obtain the information carried by the two DCIs, thereby supporting the terminal device to perform fast data demodulation.

[0025] In one possible design, if all the codewords corresponding to the at least two codeword information fields are enabled, the number of DMRS ports corresponding to the status value of the DMRS port indication field within the first preset range is less than or equal to the first threshold value, and the number of DMRS ports corresponding to the status value of the port indication field within the second preset range is greater than the first threshold value, thereby supporting a transmission mode in which 1 DCI indicates that a single base station transmits 1 or 2 codewords and a transmission mode in which 2 DCIs indicate that two base stations transmit at least 2 codewords. In this way, only the transmission mode in which two base stations transmit at least 2 codewords requires the terminal device to perform blind detection of 2 DCIs, thereby reducing the blind detection complexity of the terminal device and supporting the terminal device to perform fast data demodulation.

[0026] Further, if all the codewords corresponding to the at least two codeword information fields are enabled, the number of DMRS ports corresponding to the status value of the DMRS port indication field within the first preset range is less than or equal to the first threshold value, and the DMRS port number corresponding to the status value corresponds to the same CDM group.

[0027] In one possible design, each of the at least two codeword information fields includes: a modulation and coding strategy MCS field and a redundant version RV field; when the state value of the MCS field is within a third preset range and the state value of the RV field is within a fourth preset range, the codeword information field is used to indicate that the codeword corresponding to the codeword information field is not enabled, otherwise the codeword corresponding to the codeword information field is enabled.

[0028] In another possible implementation, if the mask of the cyclic redundancy check CRC bit corresponding to the second indication information is the first scrambling sequence, the first indication information is used to indicate the existence of the second indication information. In this way, the first indication information in the first time unit can be carried by the mask of the CRC bit corresponding to the second indication information, thereby effectively avoiding additional signaling overhead caused by adding a new field in the indication information and reducing the blind detection complexity of the terminal device.

[0029] In another possible implementation, if the second indication information satisfies the second information format, the second indication information can be used to indicate the existence of the first indication information, the second information format is a format with a larger number of bits than the first information format among multiple DCI formats used to schedule downlink data transmission, and the first information format is a format with the least number of bits among multiple DCI formats used to schedule downlink data transmission. In this way, the information format satisfied by the second indication information can indicate the existence of the first indication information in the first time unit, thereby effectively avoiding the additional signaling overhead caused by adding a new field in the indication information and reducing the blind detection complexity of the terminal device.

[0030] In a possible design, the first indication information and the second indication information both include a first field, and the first network device may further send third indication information, the third indication information being used to indicate that the first field in the first indication information is the same as the content indicated by the first field in the second indication information. The terminal device may further receive the third indication information; the terminal device may quickly decode the first indication information and the second indication information according to the first field, or verify the correctness of the decoding of the first indication information and the second indication information.

[0031] In a third aspect, an embodiment of the present application provides a network device having the function of implementing the first aspect or any possible design of the network device in the first aspect. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0032] In one possible design, the structure of the network device includes a processing module and a transceiver module, and the processing module is configured to support the network device to perform the corresponding functions in the first aspect or any one of the designs of the first aspect. The transceiver module is used to support communication between the network device and other communication devices. The network device may also include a storage module, which is coupled to the processing module and stores program instructions and data necessary for the network device. As an example, the processing module may be a processor, the communication module may be a transceiver, and the storage module may be a memory.

[0033] In a fourth aspect, an embodiment of the present application provides a terminal device, which has the function of implementing the above-mentioned second aspect or any possible design of the terminal device in the second aspect. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions.

[0034] In one possible design, the structure of the terminal device includes a processing module and a transceiver module, and the processing module is configured to support the terminal device to perform the corresponding functions in the above second aspect or any one of the designs of the second aspect. The transceiver module is used to support communication between the terminal device and other communication devices. The terminal device may also include a storage module, which is coupled to the processing module and stores program instructions and data necessary for the terminal device. As an example, the processing module may be a processor, the communication module may be a transceiver, and the storage module may be a memory.

[0035] In a fifth aspect, an embodiment of the present application provides a chip, which is coupled to a memory and is used to read and execute a software program stored in the memory to implement a method in any possible design in the first aspect above, or to implement a method in any possible design in the second aspect above.

[0036] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-readable instructions are stored. When a computer reads and executes the computer-readable instructions, the computer executes a method in any possible design in the first aspect above, or executes a method in any possible design in the second aspect above.

[0037] In the seventh aspect, an embodiment of the present application provides a computer program product. When a computer reads and executes the computer program product, the computer executes a method in any possible design in the above-mentioned first aspect, or executes a method in any possible design in the above-mentioned second aspect.

[0038] In an eighth aspect, an embodiment of the present application provides a communication system, which includes a terminal device and a network device, wherein the network device can be used to execute the method described in the above-mentioned first aspect or any possible design of the first aspect, and the terminal device can be used to execute the method described in the above-mentioned second aspect or any possible design of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 An application scenario in which a DCI is used for scheduling indication of a PDSCH in the prior art;

[0040] Figure 2It is an application scenario in which two DCIs are used for scheduling indication of PDSCH in the prior art;

[0041] Figure 3 A schematic diagram of a network architecture applicable to an embodiment of the present application;

[0042] Figure 4 A flow chart of a communication method provided in an embodiment of the present application;

[0043] Figure 5 This is a schematic diagram of a detection process of a terminal device applicable to implementation method 2 in an embodiment of the present application;

[0044] Figure 6a and Figure 6b A schematic diagram of a first CRC mask and a second CRC mask provided in an embodiment of the present application;

[0045] Figure 7 This is a schematic diagram of a detection process of a terminal device applicable to implementation method 5 in an embodiment of the present application;

[0046] Figure 8 A schematic diagram of the structure of a network device provided in an embodiment of the present application;

[0047] Fig. 9 A schematic diagram of the structure of another network device provided in an embodiment of the present application;

[0048] Fig.10 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0049] Fig.11 A schematic diagram of the structure of another terminal device provided in an embodiment of the present application;

[0050] Fig.12 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0051] Fig.13 Another schematic diagram of the structure of the communication device provided in the embodiment of the present application;

[0052] Fig.14 A further structural diagram of a communication device provided in an embodiment of the present application;

[0053] Fig.15 A further structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of this application clearer, the following is a detailed description of the embodiments of this application in conjunction with the accompanying drawings. It should be noted that the terms used in the implementation method of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application.

[0055] See also Figure 3 , is a schematic diagram of a network architecture applicable to an embodiment of the present application, the network architecture includes a first network device 301, a second network device 302 and a terminal device UE 303, the first network device and the second network device form a collaboration set for jointly / collaboratively transmitting data to the terminal device 303, of course, the collaboration set may also include other network devices such as a third network device, a fourth network device, etc., and the embodiment of the present application does not specifically limit this.

[0056] It should be understood that the network architecture of the embodiments of the present application can be applied to various communication systems, such as: global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS) and future 5G communication system, 6G communication system, etc.

[0057] Below, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0058] 1) Terminal equipment, including equipment that provides voice and / or data connectivity to users, such as a handheld device with wireless connection function, or a processing device connected to a wireless modem. The terminal equipment can communicate with the core network via a radio access network (RAN) and exchange voice and / or data with the RAN. The terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point (AP), remote terminal equipment, access terminal equipment, user terminal equipment, user agent, or user equipment, etc. For example, it may include a mobile phone (or "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device, a smart wearable device, etc. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA), etc. It also includes limited devices, such as devices with low power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. For example, it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), laser scanners, etc.

[0059] As an example but not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and fully or partially independent of smartphones, such as smart watches or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0060] 2) Network equipment, such as a base station (e.g., an access point), may refer to a device in an access network that communicates with a wireless terminal device through one or more cells at an air interface. The network equipment may be used to convert received air frames to and from Internet Protocol (IP) packets, as a router between the terminal device and the rest of the access network, wherein the rest of the access network may include an IP network. The network equipment may also coordinate the attribute management of the air interface. For example, the network equipment may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), or may also include a next generation node B (next generation node B, gNB) in a fifth generation mobile communication technology (fifth generation, 5G) new radio (new radio, NR) system, or may also include a centralized unit (CU) and a distributed unit (DU) in a cloud access network (CloudRAN) system, and the embodiments of the present application are not limited thereto.

[0061] 3) The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "Multiple" refers to two or more. In view of this, in the embodiments of the present application, "multiple" can also be understood as "at least two". "At least two" can be understood as two or more, for example, two, three or more. "At least one" can be understood as one or more, for example, one, two or more. Similarly, the understanding of descriptions such as "multiple" is similar. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the previously associated objects are in an "or" relationship.

[0062] It should be understood that in the following description, the words "first", "second" and the like are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order. Based on the above network structure, Figure 4 For a flow chart of a communication method provided in an embodiment of the present application, please refer to Figure 4 , the method specifically comprises the following steps:

[0063] Step S401: The first network device generates first indication information; the first indication information is used to indicate a first downlink resource, and whether second indication information exists within a first time unit, and the second indication information is used to indicate a second downlink resource; the first downlink resource and the second downlink resource are used to carry downlink data;

[0064] Step S402: the first network device sends the first indication information to the terminal device within the first time unit;

[0065] Step S403: The terminal device detects first indication information in a first time unit. If the detected first indication information indicates that the second indication information does not exist in the first time unit, the terminal device stops detecting the second indication information in the first time unit.

[0066] It can be seen from this that since the first indication information sent by the first network device within the first time unit can be used to indicate whether the second indication information exists within the first time unit, therefore, when the terminal device detects the first indication information, if the first indication information is the first indication information actually detected by the terminal device, and the first indication information indicates that the second indication information does not exist within the first time unit, then the terminal device can terminate the blind detection process of the second indication information in advance, that is, the number of blind detections for the second indication information does not need to reach the pre-defined maximum number of blind detections, thereby effectively reducing the blind detection complexity of the terminal device, supporting the terminal device to perform fast PDSCH demodulation, and avoiding the technical problem of high power consumption caused by always blindly detecting two indication information in the prior art.

[0067] Before describing the method steps of the embodiment of the present application in detail, it should be noted that the embodiment of the present application is described by taking the example that the protocol stipulates that a maximum of two codewords (i.e., codewords) are transmitted, and accordingly, the network device configures the terminal device to detect a maximum of two DCIs through high-level signaling. It should be understood that as the data processing capabilities of network devices and terminal devices continue to increase, future communication systems may also support the transmission of more codewords. Therefore, in this case, further expansion can be made based on the embodiment of the present application so that the terminal device can know the number of DCIs to be detected, thereby stopping unnecessary DCI blind detection processes in a timely manner and reducing the detection power consumption of the terminal device.

[0068] In the specific implementation of step S401, the first network device is any network device in the cooperation set. Taking the network device as a base station, the cooperation set includes multiple base stations as an example, the network device can be a serving base station in the cooperation set, or a cooperative base station in the cooperation set, which is not specifically limited in the present embodiment.

[0069] The first indication information and the second indication information are indication information sent by the first network device within the first time unit for indicating the downlink resource carrying downlink data. Specifically, the first indication information may be a first DCI for downlink data scheduling, the first DCI being used to indicate the first downlink resource allocated by the first network device to the terminal device, and whether the second indication information exists within the first time unit, the second indication information may be a second DCI for downlink data scheduling, being used to indicate the second downlink resource allocated by the first network device to the terminal device, the first downlink resource and the second downlink resource occupy the same time unit in the time domain, i.e., the first time unit. That is, when the terminal device transmits and receives downlink data using the first downlink resource and the second downlink resource, the data transmission on the first downlink resource and the data transmission on the second downlink resource occur (or can be approximately regarded as) at the same time. The first downlink resource and the second downlink resource may also occupy different time units in the time domain, and the time units occupied by the first downlink resource and the second downlink resource in the time domain are respectively determined by the time domain resources indicated by the first DCI and the second DCI.

[0070] The first DCI may include at least two codeword information fields, each of which is used to indicate whether the corresponding codeword is enabled. Similarly, the second DCI may include at least two codeword information fields, each of which is used to indicate whether the corresponding codeword is enabled.

[0071] It should be noted that in the embodiment of the present application, each codeword information field in the first codeword information field and / or the second codeword information field may correspond to one codeword or multiple codewords. In the current application scenario, generally one codeword information field corresponds to one codeword, and the current communication protocol only supports the transmission of the maximum codeword. The first codeword information field and / or the second codeword information field may contain multiple codeword information fields, and each codeword information field may correspond to one codeword. Therefore, the embodiment of the present application will be described by taking one codeword information field corresponding to one codeword and one DCI including two codeword information fields as an example, and will not be repeated later.

[0072] In the embodiment of the present application, a codeword can be understood as a group of data bits carried on the downlink resource indicated by the network device. The network device can use an independent modulation and coding method for the data of each codeword, and indicate it through the codeword information field in the DCI. For example, if the first DCI includes two codeword information fields, the two codeword information fields correspond to two codewords respectively. If both codewords are enabled, it means that the network device has configured two independent modulation and coding methods for the downlink data transmitted on the first downlink resource. If only one codeword is enabled, it means that the network device has configured a modulation and coding method for the downlink data transmitted on the first downlink resource. And each codeword corresponds to an independent transmission layer, and also corresponds to a maximum transmission layer value. This is because when the number of transmission layers is large, the channel state of each layer of data is quite different. The use of the same modulation and coding method may bring about a large performance loss, so it is necessary to use multiple codewords to transmit data with a large number of transmission layers.

[0073] More specifically, the DCI involved in the embodiments of the present application may have two possible formats: format 1_1 and format 1-0. Among them, format 1_1 is a common DCI format for downlink grant (scheduling PDSCH), and the DCI format specifically includes the following fields:

[0074] ●DCI format indication information: 1 bit, used to indicate downlink DCI or uplink DCI;

[0075] ●Carrier indicator (CI): 0 or 3 bits;

[0076] Bandwidth part (BWP) indication: 0, 1, 2 bits, used to indicate the activated BWP for transmission of PDSCH and PDCCH;

[0077] ● Frequency domain resource location indication: N RBG Bit, N RBG Indicates that the activated BWP is divided into N resource blocks with resource block group (RBG) as the granularity. RBG bandwidths, each bandwidth uses 1 bit to indicate whether it is allocated to the UE to receive PDSCH, that is, the bitmap indication method;

[0078] ●Time domain resource location indication information: 0, 1, 2, 3, 4 bits, used to indicate the time domain resource location of PDSCH;

[0079] Virtual resource block (VRB) to physical resource block (PRB) mapping: 0, 1 bit, used to indicate whether PDSCH is frequency-domain interleaved;

[0080] ●PRB bundling size indication: 0, 1 bit, used to indicate the size of the PRB bundling of the PDSCH;

[0081] ●Rate matching indication: 0, 1, 2 bits, used to indicate the resource set for PDSCH rate matching;

[0082] ●Zero power channel state information reference signal (ZP CSI-RS) trigger: used to indicate the triggering of a ZP CSI-RS resource set for PDSCH rate matching;

[0083] ●For transport block (TB) 1:

[0084] ■ Modulation and coding scheme (MCS): 5 bits;

[0085] ■New data indicator (NDI): 1 bit, used to indicate that the PDSCH is new data.

[0086] It is retransmission data;

[0087] ■Redundancy version (RV): 2 bits;

[0088] ●For transport block (TB) 2:

[0089] ■ Modulation and coding strategy MCS: 5 bits;

[0090] ■New Data Indicator NDI: 1 bit, used to indicate whether the data carried by the PDSCH is new data or retransmission data;

[0091] ■Redundancy version RV: 2 bits;

[0092] ● Number of hybrid automatic repeat request (HARQ) processes;

[0093] ● Downlink assignment index (DAI): 0, 2, 4 bits, used to indicate the HARQ count;

[0094] ●Scheduled PUCCH transmission power control command (TPC command): 2 bits, used to indicate the PUCCH transmission power adjustment;

[0095] ●PUCCH resource indication: 3 bits, used to indicate the uplink PUCCH resource used for PDSCH-related HARQ feedback;

[0096] ●PDSCH to HARQ feedback timing indication: 0, 1, 2, 3 bits;

[0097] ●Demodulation reference signal (DMRS) port indication: 4, 5, 6 bits, used to indicate the antenna port used by PDSCH and the corresponding DMRS; the maximum number of orthogonal DMRS ports currently supported is 12. Different DMRS ports are used to distinguish data of different layers, and different DMRS ports correspond to different time-frequency resource locations and precoding matrices. Therefore, the base station needs to notify the UE of the DMRS port number and port number corresponding to the PDSCH currently received, so that the UE can receive the corresponding PDSCH according to the correct DMRS. The DM-S antenna port indication includes the indication of "CDM group that does not carry data", and its indication values ​​1, 2, and 3 correspond to CDM groups {0}, {0, 1} and {0, 1, 2} respectively. For example, when the "CDM group that does not carry data" indication is 1, it means that CDM group {1, 2} will carry PDSCH data, and the UE needs to receive PDSCH on the corresponding time-frequency resources, while CDM group 0 will not carry PDSCH data, and the UE does not need to receive PDSCH on the corresponding time-frequency resources;

[0098] ● Transmission configuration indication: 0, 3 bits, used to indicate the quasi co-location (QCL) assumption information and receive beam information of the PDSCH and the corresponding DMRS;

[0099] ●SRS request: 2, 3 bits, used to indicate the triggering of aperiodic SRS transmission;

[0100] ●Code block group (CBG) transmission information: 0, 2, 4, 6, 8;

[0101] ●CBG flushing information (flushing out): 0, 1 bit;

[0102] ●DMRS sequence initialization: 0, 1 bit;

[0103] Format 1_0 is a compact DCI format for downlink grant (scheduling PDSCH). This DCI format contains fewer fields than the above format 1_1, and only has the most necessary DCI fields for scheduling PDSCH. This DCI format specifically includes the following fields:

[0104] ●DCI format indication information: 1 bit, used to indicate downlink DCI or uplink DCI;

[0105] ● Frequency domain resource location indication: N RBG Bit;

[0106] ●Time domain resource location indication information - 0, 1, 2, 3, 4 bits;

[0107] ● Virtual Resource Block (VRB) to Physical Resource Block (PRB) mapping - 0,1 bit;

[0108] ●For transport block (TB) 1:

[0109] ■ Modulation and coding strategy MCS: 5 bits;

[0110] ■New data indication NDA: 1 bit;

[0111] ■Redundancy version RV: 2 bits;

[0112] Number of HARQ processes;

[0113] ●Transmission configuration indication DAI: 0, 2, 4 bits;

[0114] ●Scheduled PUCCH transmit power control command (TPC command): 2 bits;

[0115] ●PUCCH resource indication: 3 bits;

[0116] ●PDSCH to HARQ feedback timing indication: 0, 1, 2, 3 bits;

[0117] It can be seen that the above format 1_1 includes the modulation and coding strategy MCS field, the new data indication NDI field, and the redundant version RV field of two transport blocks, each transport block corresponds to a codeword, and a group of MCS fields, NDI fields, and RV fields corresponding to each transport block is a codeword information field. In the embodiment of the present application, both the first DCI and the second DCI can adopt the above format 1_1.

[0118] In a possible implementation, the first DCI and the second DCI both include two codeword information fields, which can be understood as, for a DCI that satisfies the above format, when scheduling data transmission at a certain moment, the DCI can be used to indicate the scheduling of one codeword or two codewords, and regardless of whether the DCI is used to schedule one codeword or two codewords, the DCI includes a modulation and coding strategy MCS field, a new data indication NDI field, and a redundant version RV field of two transmission blocks. When the DCI is used to schedule two codewords, the MCS, NDI, and RV fields corresponding to the two codewords indicate that both codewords are enabled. When the DCI schedules a codeword, the MCS, NDI, and RV fields corresponding to one of the codewords indicate that the codeword is enabled, while the MCS, NDI, and RV fields corresponding to the other codeword indicate that the codeword is not enabled.

[0119] In step S401, the first network device may generate a first DCI, and indicate, through the first DCI, whether a second DCI exists within a first time unit.

[0120] If the second DCI exists in the first time unit, it means that the network device in the collaboration set has sent two DCIs to the terminal device, and each DCI is used to schedule a codeword. In one possible implementation, the first DCI and the second DCI may both be sent by the first network device, corresponding to the application scenario of single base station transmission; in another possible implementation, the first DCI and the second DCI may be sent by the first network device and the second network device, respectively, corresponding to the application scenario in which the network devices in the collaboration set use the CoMP transmission mode to transmit data to the terminal device. For the sake of simplicity of description, the subsequent embodiments of the present application will be described by taking the example that both the first DCI and the second DCI are sent by the first network device, but it should be understood that the embodiments of the present application are not limited to this.

[0121] In the embodiment of the present application, the first time unit may be one or more time slots, subframes or OFDM symbols. The first time unit should be understood as that the first DCI and the second DCI are both configured with a detection period, and the detection moment of each detection period can be used as the first time unit. The detection period can be independently configured in the search space of the first DCI and the second DCI, or the detection period can be configured as the same value in advance.

[0122] It should be noted that, since the network device is unknowable in the search order of the UE blind detection search space, for example, when the network device sends two DCIs, the two DCIs can be configured in different search spaces respectively, and the UE can first detect the search space corresponding to the search space with a smaller index number, or it may first detect the search space corresponding to the search space with a larger index number. Alternatively, when the two DCIs are respectively configured on partially identical search spaces, each search space corresponds to multiple PDCCH candidates, and the multiple PDCCH candidates belong to two DCIs respectively, the network device is also unknowable in the detection order of the multiple PDCCH candidates in the UE detection search space. In the embodiment of the present application, if no additional DCI configuration and detection restrictions are made, the network cannot determine which DCI of the two DCIs in the first time unit the UE will detect first, and the UE may first detect the first DCI, or it may first detect the second DCI. Therefore, the second DCI also needs to indicate that the first DCI exists in the first time unit. That is, when the network device in the collaborative set sends two DCIs to the terminal device, each DCI indicates the existence of another DCI to prompt the terminal device to detect two DCIs.

[0123] If the second DCI does not exist within the first time unit, it means that only the first network device in the collaborative set has sent the first DCI to the terminal device. When the first DCI schedules one codeword, it corresponds to a single base station transmission scenario. When the first DCI schedules two codewords, the data of the two codewords can be sent by the first network device, corresponding to the application scenario of single base station transmission, or the data of different codewords can be transmitted by the first network device and the second network device in a collaborative manner, and each network device is used to transmit the data of one codeword, such as the first network device sends the first codeword scheduled by the first DCI, and the second network device sends the second codeword scheduled by the second DCI, that is, the CoMP transmission mode.

[0124] It should be noted that the CoMP transmission mode involved in the embodiments of the present application specifically includes the following transmission modes:

[0125] 1. Dynamic point switching (DPS): In response to changes in channel conditions when a terminal device is transmitting data, a network device with better channel conditions in the cooperation set is dynamically selected to schedule the data of the terminal device each time data is transmitted. This can be understood as multiple base stations transmitting data for a certain UE in a time-sharing manner.

[0126] 2. Coherent joint transmission (C-JT): Multiple network devices transmit data to a terminal device at the same time, and the antenna ports of multiple network devices are jointly precoded, that is, the optimal precoding matrix is ​​selected to perform joint phase and amplitude weighting between the antenna ports of multiple network devices. This mechanism requires phase calibration of the antennas of multiple network devices so that accurate phase weighting is performed between multiple groups of antennas;

[0127] 3. Non-coherent joint transmission (NC-JT): Multiple network devices transmit data to a terminal device at the same time, and the antenna ports of multiple network devices are independently precoded. That is, each network device independently selects the optimal precoding matrix to perform joint phase and amplitude weighting between the antenna ports of the network device. This mechanism does not require phase calibration of the antennas of multiple network devices.

[0128] 4. Diversity transmission: The above three transmission modes all assume that two network devices transmit different data bits, that is, they support multi-stream transmission to improve the transmission rate and system capacity. The purpose of the transmission mode based on spatial multiplexing is to enhance the robustness of data transmission. Therefore, this transmission mode is that two network devices use different transmission methods (such as precoding, power, beam) to send the same data bits. The terminal device receives two identical data streams and can perform soft bit merging operations on the two data streams to improve data demodulation performance.

[0129] In the embodiment of the present application, any one of the first DCI and the second DCI may indicate that "whether there is another DCI in the first time unit". There are multiple possible implementations. Several possible implementations are described in detail below.

[0130] Implementation method 1:

[0131] Taking the first DCI indicating "whether there is a second DCI within the first time unit" as an example, in implementation mode 1, a field newly added to the first DCI may be used to indicate whether there is a second DCI, and the newly added field (not shown in the above formats 1_1 and 1_0) may be 1 bit. For example, when the value of the newly added field in the first DCI is 1, it indicates that there is a second DCI, and when the value of the newly added field in the first DCI is 0, it indicates that there is no second DCI.

[0132] In this way, if the second DCI does not exist, in step S402, the first network device may send the first DCI to the terminal device within the first time unit; if the second DCI exists, in step S402, the first network device may send the first DCI and the second DCI to the terminal device within the first time unit. Subsequently, in step S403, the terminal device may detect DCI on the time-frequency resources occupied by PDCCH. If the first DCI is the first DCI detected by the terminal device, the terminal device may decide whether to continue detecting the second DCI based on the value of the newly added field in the first DCI. If the value of the newly added field indicates that there is a second DCI, detection continues, otherwise detection stops. If the first DCI is the second DCI detected by the terminal device, the terminal device may confirm that the indication carried by the first DCI is "the second DCI exists in the first time unit" based on the first DCI detected previously (i.e., the second DCI).

[0133] In the embodiment of the present application, the second DCI may adopt the same indication method as the first DCI, that is, the second DCI also includes the above-mentioned newly added field for indicating "the first DCI exists in the first time unit", which will not be repeated here.

[0134] Implementation method 2:

[0135] In the second implementation method, the existing fields in the DCI format can be reused to carry the information indicating whether a second DCI exists within the first time unit for any one of the two DCIs, thereby avoiding additional signaling overhead caused by adding new fields in the current DCI.

[0136] For the first DCI, the first DCI may include at least two codeword information fields, and the first codeword information field of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled. When all the codewords corresponding to the at least two codeword information fields are enabled, the first DCI can be used to indicate that the second DCI does not exist in the first time unit; when some of the codewords corresponding to the at least two first codeword information fields are enabled, the first DCI can be used to indicate that the second DCI exists in the first time unit. At this time, the second DCI is also used to indicate that the first DCI exists in the first time unit, then the second DCI also includes at least two codeword information fields, and some of the codewords corresponding to the at least two codeword information fields are enabled.

[0137] In a specific example, the first DCI may include two codeword information fields, namely: codeword information field 1 for indicating transport block TB1 and codeword information field 2 for indicating transport block TB2. Codeword information field 1 may include an MCS field, an NDI field, and an RV field, which are respectively used to indicate the modulation and coding strategy adopted by the codeword corresponding to codeword information field 1, whether it is new transmission data or retransmission data, and the encoding method of retransmission data. The same is true for codeword information field 2, which will not be repeated here.

[0138] When the codeword corresponding to codeword information field 1 and the codeword corresponding to codeword information field 2 are both enabled, the first DCI can be used to indicate that there is no second DCI within the first time unit. In this way, in step S402, the first network device can send the first DCI to the terminal device. In step S403, the terminal device can detect DCI on the time-frequency resources occupied by PDCCH, and determine that the network device in the collaborative set has only sent one DCI based on the detected first DCI, and then stop the blind detection process for the second DCI to reduce detection power consumption. At this time, the DMRS corresponding to the codewords corresponding to codeword information field 1 and codeword information field 2 both use the same QCL assumption, and the corresponding transmission mode is PDSCH transmission with a single base station greater than 4 layers (corresponding to 2 codewords).

[0139] When the codeword corresponding to codeword information field 1 is enabled, and the codeword corresponding to codeword information field 2 is not enabled, or when the codeword corresponding to codeword information field 1 is not enabled, and the codeword corresponding to codeword information field 2 is enabled, one understanding may be that the first DCI may be used to indicate the presence of the second DCI in the first time unit, and another understanding may be that the first DCI does not explicitly indicate whether the second DCI exists in the first time unit. In this case, in step S403, after the terminal device detects the first DCI, it may default to continuing to detect the second DCI. If the second DCI is subsequently detected, it is determined that the current transmission mode is NC-JT transmission using two codewords. Otherwise, if the second DCI is still not detected after completing the maximum number of blind detections (the maximum number of blind detections for UE specified in the current protocol is 44 times), it is confirmed that the network device in the collaborative set has only sent one DCI. At this time, the corresponding transmission mode is PDSCH transmission of no more than 4 layers (corresponding to one codeword) by a single base station.

[0140] Similarly, for the second DCI (if the second DCI exists), the second DCI may include at least two codeword information fields, each of which is used to indicate whether the corresponding codeword is enabled. When all the codewords corresponding to the at least two codeword information fields are enabled, the second DCI may be used to indicate that the first DCI does not exist within the first time unit; when some of the codewords corresponding to the at least two codeword information fields are enabled, the second DCI may be used to indicate that the first DCI exists in the first time unit.

[0141] In a specific example, the second DCI may include two codeword information fields, namely: codeword information field 3 for indicating transport block TB1 and codeword information field 4 for indicating transport block TB2. Codeword information field 3 may include an MCS field, an NDI field, and an RV field, which are respectively used to indicate the modulation and coding strategy adopted by the codeword corresponding to codeword information field 3, whether it is new transmission data or retransmission data, and the encoding method of retransmission data. The same is true for codeword information field 4, which will not be repeated here.

[0142] When the codeword corresponding to codeword information field 3 and the codeword corresponding to codeword information field 4 are both enabled, the second DCI can be used to indicate that the first DCI does not exist in the first time unit; when the codeword corresponding to codeword information field 1 is enabled, and the codeword corresponding to codeword information field 2 is not enabled, the second DCI can be used to indicate that the first DCI exists in the first time unit. Of course, since the network device will send at least one DCI when scheduling downlink data to the terminal device, and the embodiment of the present application is described from the perspective of assuming that the first DCI must exist and the first network device will send the first DCI in the first time unit, there will be no situation where "the second DCI indicates that the first DCI does not exist in the first time unit", but it should be understood that the description of "the second DCI indicates that the first DCI does not exist in the first time unit" is to illustrate the indication method of the second DCI indicating "whether the first DCI exists". That is, when only some codewords are enabled in the first DCI, the second DCI also indicates that only some codewords are enabled, or, when only some codewords are enabled in the first DCI, the second DCI also indicates that only some codewords are enabled, so that the first DCI and the second DCI mutually indicate that there is another DCI, and no matter which DCI the UE detects first, it will continue to detect the other DCI. When the UE detects two DCIs, both DCIs indicate that only some codewords are enabled. If other situations occur, such as the later detected DCI indicates that all codewords are enabled, the UE may consider that its detection is erroneous and may terminate the demodulation and decoding of the data indicated by the two DCIs.

[0143] Thus, in step S402, the first network device may send the first DCI and the second DCI to the terminal device. In step S403, the terminal device may detect DCI on the time-frequency resources occupied by the PDCCH. If the first DCI is the first DCI detected by the terminal device, the terminal device may determine that the network device in the collaborative set has sent two DCIs based on the detected first DCI, and then continue to detect the second DCI. After the second DCI is subsequently detected, it may be determined that the current transmission mode is NC-JT transmission.

[0144] It should be noted that in the embodiment of the present application, the terminal device can determine whether the codeword corresponding to a codeword information field is enabled according to the values ​​of the MCS field and the RV field of a codeword information field. When the values ​​of the MCS field and the RV field are certain specific values, such as when the value of the MCS field is 26 and the value of the RV field is 1, it indicates that the codeword corresponding to the codeword information field is not enabled, and when the values ​​of the MCS field and the RV field are other values, it indicates that the codeword corresponding to the codeword information field is enabled, and the modulation and coding method indicated by the MCS and RV fields is used to demodulate the data corresponding to the codeword.

[0145] The detection process of the terminal equipment can be as follows Figure 5 As shown, Figure 5 The nth blind detection (blind detection, BD) time represents the detection of the nth PDCCH candidate among the N PDCCH candidates (corresponding to the maximum number of blind detection times of N) included in the entire search space configured for the terminal device. In the embodiment of the present application, a search space includes multiple aggregation levels, and each aggregation level can correspond to multiple PDCCH candidates. Assuming that the terminal device usually performs serial detection, each blind detection can only detect one PDCCH candidate, and BD 1 corresponds to the PDCCH candidate of DCI 1, and BD 2 corresponds to the PDCCH candidate of DCI 2. When the terminal device performs the n+3th detection of the PDCCH candidate, DCI 2 is successfully detected and it is determined that both codewords are enabled. At this time, the terminal device does not need to detect the subsequent PDCCH candidate corresponding to DCI 1 (BD 1); when the terminal device performs the n+3th detection of the PDCCH candidate, DCI 2 is successfully detected and it is determined that both codewords are enabled. At this time, the terminal device continues to detect the subsequent PDCCH candidate corresponding to DCI 1 (i.e., BD 1).

[0146] Implementation method three:

[0147] In implementation method three, the MCS field, NDI field, RV field in the multiplexing codeword information field, and the DMRS port indication field in the DCI can be used to jointly achieve the purpose of indicating "whether there is another DCI in the first time unit" in any of the two DCIs, thereby also achieving the purpose of avoiding the additional signaling overhead caused by the new field in the current DCI, while ensuring that when the DMRS port indication field is multiplexed, the flexibility of the DMRS port indication field is not affected regardless of whether one codeword or two codewords are scheduled. In the prior art, the number of DMRS ports and the port number indicated by the DMRS port indication field in the DCI are determined according to the number of enabled codewords indicated by the codeword information field in the DCI. When the DCI indicates that the number of enabled codewords is greater than a predefined value, such as 2 (assuming that the maximum number of enabled codewords is 2), the number of DMRS ports indicated by the DMRS port indication field is greater than 4. When the DCI indicates that the number of enabled codewords is less than or equal to a predefined value, such as 1 (assuming that the maximum number of enabled codewords is 2), the number of DMRS ports indicated by the DMRS port indication field is less than or equal to 4.

[0148] Specifically, for the first DCI, the first DCI may include a DMRS port indication field and at least two codeword information fields, wherein each of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled, and the DMRS port indication field is used to indicate the port of the demodulation reference signal DMRS corresponding to the data transmitted on the first downlink resource.

[0149] When all the codewords corresponding to the at least two codeword information fields are enabled and the status value of the DMRS port indication field is within the first preset range, the first DCI can be used to indicate that the second DCI exists in the first time unit; when all the codewords corresponding to the at least two codeword information fields are enabled and the status value of the port indication field is within the second preset range, the first DCI can be used to indicate that the second DCI does not exist in the first time unit; when some of the codewords corresponding to the at least two first codeword information fields are enabled, the first DCI can be used to indicate that the second DCI does not exist in the first time unit.

[0150] In one possible design, the number of DMRS ports corresponding to the state value of the DMRS port indication field within the first preset range is less than or equal to the first threshold value, and the number of DMRS ports corresponding to the state value of the DMRS port indication field within the second preset range is greater than the first threshold value. The specific value of the first threshold value can be set by those skilled in the art according to actual needs and is not specifically limited here. It is generally believed that when the number of transmission layers is greater than 4, using 1 codeword for data transmission will cause performance loss, so one possible setting method is to set the first threshold value to 4.

[0151] In a specific example, the first DCI may include a first DMRS port indication field and two codeword information fields, wherein the two codeword information fields are: codeword information field 1 for indicating transmission block TB1 and codeword information field 2 for indicating transmission block TB2. Codeword information field 1 may include an MCS field, an NDI field, and an RV field, which are respectively used to indicate the modulation and coding strategy adopted by the codeword corresponding to codeword information field 1, whether it is new transmission data or retransmission data, and the encoding method of retransmission data. The same is true for codeword information field 2, which will not be repeated here. The first DMRS port indication field is used to indicate the DMRS port number corresponding to the data transmitted on the first downlink resource this time, and the port number of DMRS, which represents the number of transmission layers corresponding to the data transmitted this time.

[0152] If the codeword corresponding to the codeword information field 1 and the codeword corresponding to the codeword information field 2 are both enabled, and the field value of the first DMRS port indication field is within the first preset range, the first DCI can be used to indicate the presence of the second DCI in the first time unit. In this way, in step S402, the first network device can send the first DCI and the second DCI to the terminal device. In step S403, the terminal device can detect DCI on the time-frequency resources occupied by the PDCCH. If the first DCI is the first DCI detected by the terminal device, the terminal device can determine, based on the detected first DCI, that the network device in the collaborative set has sent two DCIs, and that it is necessary to continue to detect the second DCI later. At this time, the corresponding transmission mode is NC-JT transmission using two codewords. Similarly, if the second DCI is the first DCI detected by the terminal device, the terminal device can determine that it is necessary to continue to detect the first DCI later. At this time, the corresponding transmission mode is NC-JT transmission using two codewords.

[0153] On the contrary, if the codeword corresponding to the codeword information field 1 and the codeword corresponding to the codeword information field 2 are both enabled, but the field value of the first DMRS port indication field is within the second preset range (the second preset range is different from the first preset range and does not overlap), the first DCI can be used to indicate that the second DCI does not exist within the first time unit. In this way, in step S402, the first network device can send the first DCI to the terminal device. In step S403, the terminal device can detect the DCI on the time-frequency resources occupied by the PDCCH, and determine, based on the detected first DCI, that the network device in the collaborative set has only sent one DCI, thereby stopping unnecessary blind detection processes and reducing detection power consumption. At this time, the corresponding transmission is a PDSCH transmission of more than 4 layers (corresponding to 2 codewords) for a single base station.

[0154] Further, if only one of the codewords corresponding to the codeword information field 1 and the codeword corresponding to the codeword information field 2 is enabled, at this time, regardless of whether the value of the first DMRS port indication field is within the first preset range or within the second preset range, the first DCI can be used to indicate that the second DCI does not exist within the first time unit. In this way, in step S402, the first network device can send the first DCI to the terminal device. In step S403, the terminal device can detect the DCI on the time-frequency resources occupied by the PDCCH, and determine, based on the detected first DCI, that the network device in the collaborative set has only sent one DCI, thereby stopping unnecessary blind detection processes and reducing detection power consumption. At this time, the corresponding transmission is a PDSCH transmission of no more than 4 layers (corresponding to one codeword) of a single base station.

[0155] Similarly, for the second DCI, the second DCI may include a DMRS port indication field and at least two codeword information fields, wherein each of the at least two codeword information fields can be used to indicate whether the corresponding codeword is enabled, and the second DMRS port indication field can be used to indicate the DMRS port corresponding to the data transmitted on the second downlink resource.

[0156] When all the codewords corresponding to the at least two codeword information fields are enabled and the status value of the DMRS port indication field is within the first preset range, the second DCI may be used to indicate that the first DCI exists in the first time unit; when all the codewords corresponding to the at least two codeword information fields are enabled and the status value of the DMRS port indication field is within the second preset range, the second DCI may be used to indicate that the first DCI does not exist in the first time unit; when some of the codewords corresponding to the at least two codeword information fields are enabled, the second DCI may be used to indicate that the first DCI does not exist in the first time unit.

[0157] In one possible design, the number of DMRS ports corresponding to the state value of the DMRS port indication field within the first preset range is less than or equal to the first threshold value, and the number of DMRS ports corresponding to the state value of the DMRS port indication field within the second preset range is greater than the first threshold value.

[0158] In a specific example, the second DCI may include two codeword information fields and a second DMRS port indication field, wherein the two codeword information fields are: codeword information field 3 for indicating transmission block TB1 and codeword information field 4 for indicating transmission block TB2. Codeword information field 3 may include an MCS field, an NDI field, and an RV field, which are respectively used to indicate the modulation and coding strategy adopted by the codeword corresponding to codeword information field 3, whether it is new transmission data or retransmission data, and the encoding method of retransmission data. The same is true for codeword information field 4, which will not be repeated here. The second DMRS port indication field is used to indicate the DMRS port number corresponding to the data transmitted on the second downlink resource this time, and the port number of DMRS, which represents the number of transmission layers corresponding to the data transmitted this time.

[0159] If the codeword corresponding to the codeword information field 3 and the codeword corresponding to the codeword information field 4 are both enabled, and the field value of the second DMRSDMRS port indication field is within the first preset range, the second DCI can be used to indicate that the first DCI exists in the first time unit. In this way, in step S402, the first network device can send the first DCI and the second DCI to the terminal device. In step S403, the terminal device can detect DCI on the time-frequency resources occupied by the PDCCH. If the second DCI is the first DCI detected by the terminal device, the terminal device can determine that the network device in the collaborative set has sent two DCIs based on the detected second DCI, and the first DCI needs to be detected later. At this time, the corresponding transmission is NC-JT transmission. Similarly, if the first DCI is the first DCI detected by the terminal device, the terminal device can determine that the second DCI needs to be detected later. At this time, the corresponding transmission is NC-JT transmission.

[0160] On the contrary, if the codeword corresponding to the codeword information field 3 and the codeword corresponding to the codeword information field 4 are both enabled, but the field value of the second DMRS port indication field is within the second preset range (the second preset range is different from the first preset range and does not overlap), the second DCI can be used to indicate that the first DCI does not exist within the first time unit. In this way, in step S402, the first network device can send the second DCI to the terminal device. In step S403, the terminal device can detect the DCI on the time-frequency resources occupied by the PDCCH, and determine, based on the detected second DCI, that the network device in the collaborative set has only sent one DCI (i.e., the second DCI), thereby stopping unnecessary blind detection processes and reducing detection power consumption. At this time, the corresponding transmission is a PDSCH transmission of more than 4 layers (corresponding to 2 codewords) for a single base station.

[0161] Further, if only one of the codewords corresponding to the codeword information field 3 and the codeword corresponding to the codeword information field 4 is enabled, at this time, regardless of whether the value of the second DMRS port indication field is within the first preset range or within the second preset range, the second DCI can be used to indicate that the first DCI does not exist within the first time unit. In this way, in step S402, the first network device can send the second DCI to the terminal device. In step S403, the terminal device can detect the DCI on the time-frequency resources occupied by the PDCCH, and determine, based on the detected second DCI, that the network device in the collaborative set has only sent one DCI (i.e., the second DCI), thereby stopping unnecessary blind detection processes and reducing detection power consumption. At this time, the corresponding transmission mode is PDSCH transmission of no more than 4 layers (corresponding to one codeword).

[0162] It should be understood that in the scenario where the network device schedules downlink data transmission for the terminal device, the network device will send down at least one DCI. If one DCI is sent down and the DCI schedules one codeword, it means that the scheduled downlink data transmission is a single base station transmission. If two DCIs are sent down, or one DCI is sent down but the DCI schedules two codewords, it means that the scheduled downlink data transmission may be a multi-base station coordinated transmission. Therefore, the embodiment of the present application is described from the perspective that the first DCI must exist, but the second DCI may or may not exist. Therefore, in the embodiment of the present application, there will be no situation where "the second DCI indicates that the first DCI does not exist within the first time unit". However, the above description is only for the purpose of explaining the indication method of the second DCI, and the second DCI can be indicated in the same or similar manner as the first DCI.

[0163] It should be noted that in this implementation method three, whether the codeword corresponding to a certain codeword information field is enabled is similar to the description in implementation method two, that is, when the values ​​of the MCS field and the RV field in the codeword information field are certain specific values, it means that the codeword corresponding to the codeword information field is not enabled, otherwise, the codeword is enabled, which will not be repeated here.

[0164] Table 1 exemplifies the meaning of the DMRS port indication field in the embodiment of the present application. Please refer to the following Table 1, taking the first DCI as an example, when only one of the codewords corresponding to the codeword information field 1 and the codeword corresponding to the codeword information field 2 is enabled, the meaning of the DMRS port indication field can be interpreted according to the left half of Table 1 in Table 1. At this time, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to the 1 codeword enabled by the first DCI indication. When there are two codewords enabled, the meaning of the DMRS port indication field can be interpreted according to the right half of Table 1. When the state value indicated by the DMRS port indication field is within the first preset range, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to the two codewords enabled by the first DCI indication; when the state value indicated by the DMRS port indication field is within the second preset range, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to one of the two codewords enabled by the first DCI indication, and the DMRS port corresponding to the other codeword will be indicated by the second indication information, that is, the second DCI. At this time, the second DCI will also indicate the enabling of two codewords, and the state value indicated by the DMRS port indication field is within the second preset range, and the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to one of the two codewords enabled by the second DCI indication.

[0165] For example, when the field value of the DMRS port indication field is 0, if only one codeword is enabled at this time, it means that DMRS occupies port 0 (that is, the codeword is transmitted using port 0, and the total number of layers of the current transmission is 1); if both codewords are enabled at this time, it means that DMRS occupies ports 0-4 (that is, the codeword is transmitted using ports 0-4, and the total number of layers of the current transmission is 5, codeword 0 corresponds to 2 layers of transmission, and codeword 1 corresponds to 3 layers of transmission). It is worth noting that in the embodiments of the present application, the mapping relationship between the codeword and the number of transmission layers can be pre-defined by the protocol. Here, the meaning of the DMRS port indication field is explained only through a possible example, but the mapping relationship between the codeword and the number of transmission layers is not limited to this.

[0166] Referring to Table 1, in the third implementation, the first preset range of the field value of the DMRS port indication field specifically refers to: the value range of the DMRS port indication field (i.e., the bit domain field value in Table 1) is [4, 31], a closed interval, including 4 and 31; correspondingly, the second preset range specifically refers to: the value range of the DMRS port indication field is [0, 3], a closed interval, including 0 and 3. It is worth noting that the DMRS port information specifically corresponding to the state value 0-31 of the field can be determined in a predefined manner and not necessarily in the order in the example table, that is, the DMRS port information needs to include the DMRS port combination in the example table, and the correspondence between the DMRS port combination and the bit domain field value can be in any predefined manner.

[0167]

[0168]

[0169] Table 1: DMRS port indication table for a maximum of 8 DMRS ports

[0170] Table 1 above corresponds to a DMRS configuration method, that is, the maximum number of DMRS ports supporting DCI indication is 8, that is, the maximum number of transmission layers for data transmission is 8. Tables 2 to 4 correspond to other DMRS configuration methods respectively.

[0171] For example, the maximum number of DMRS ports corresponding to the DCI indication supported in Table 2 (2) is 4, that is, the maximum number of transmission layers for data transmission is 4. At this time, the first DCI and the second DCI can only contain the MCS, RV, and NDI indication fields corresponding to one codeword. Among them, when the number of DMRS ports is greater than 2, it indicates that there is no other DCI, such as the field value is 9, 10. And the DMRS port indicated by the DMRS port indication field in a DCI is in the same CDM group. In this embodiment, when the field value is 0, 1, 2, 5, 6, or 8, the DMRS port indicated by the field value is the DMRS port corresponding to the codeword enabled by the DCI, and the DMRS port corresponding to another codeword is determined according to another DCI, and the DMRS port indication field value in the other DCI also takes 0, 1, 2, 5, 6, or 8; when the field value is 3, 4, 7, 9-13, the DMRS port indicated by the field value is the DMRS port corresponding to a codeword enabled by the DCI, and there is no other DCI.

[0172] For another example, the maximum number of DMRS ports corresponding to DCI indication supported in Table 3 is 6, that is, the maximum number of transmission layers for data transmission is 6. The principle of indicating whether another DCI is enabled is similar to the indication method corresponding to Table 1. The state value 0-1 on the right half of the DMRS table indicates that there is no other DCI, and the state value 2-25 indicates that there is another DCI. Taking the first DCI as an example, when only one of the codewords corresponding to the codeword information field 1 and the codeword corresponding to the codeword information field 2 is enabled, the meaning of the DMRS port indication field can be interpreted according to the left half of Table 3. At this time, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to the 1 codeword enabled by the first DCI indication. When there are two codewords enabled, the meaning of the DMRS port indication field can be interpreted according to the right half of Table 3. When the state value indicated by the DMRS port indication field is within the first preset range, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS ports corresponding to the two codewords enabled by the first DCI indication; when the state value indicated by the DMRS port indication field is within the second preset range, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to one of the two codewords enabled by the first DCI indication, and the DMRS port corresponding to the other codeword will be indicated by the second indication information, that is, the second DCI. At this time, the second DCI will also indicate the enabling of two codewords, and the state value indicated by the DMRS port indication field is within the second preset range, and the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to one of the two codewords enabled by the second DCI indication.

[0173] Referring to Table 3, in the third implementation, the first preset range of the field value of the DMRS port indication field specifically refers to: the value range of the DMRS port indication field (i.e., the bit domain field value in Table 2) is [2, 31], a closed interval, including 2 and 31; correspondingly, the second preset range specifically refers to: the value range of the DMRS port indication field is [0, 1], a closed interval, including 0 and 1. It is worth noting that the DMRS port information corresponding to the status value 0-31 of the field can be determined in a predefined manner and not necessarily in the order in the example table, that is, the DMRS port information needs to include the DMRS port combination in the example table, and the correspondence between the DMRS port combination and the bit domain field value can be any predefined manner. Among them, the number of DMRS ports corresponding to the first preset range is greater than 4, and the number of DMRS ports corresponding to the second preset range is less than or equal to 4.

[0174] For another example, the maximum number of DMRS ports corresponding to DCI indication supported in Table 4 is 12, that is, the maximum number of transmission layers for data transmission is 12. The principle of indicating whether another DCI is enabled is similar to the indication method corresponding to Table 1. The right half of the DMRS table 0-5 indicates that there is no other DCI, and 6-63 indicates that there is another DCI. Taking the first DCI as an example, when only one of the codewords corresponding to the codeword information field 1 and the codeword corresponding to the codeword information field 2 is enabled, the meaning of the DMRS port indication field can be interpreted according to the left half of Table 4. At this time, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to the 1 codeword enabled by the first DCI indication. When there are two codewords enabled, the meaning of the DMRS port indication field can be interpreted according to the right half of Table 4. When the state value indicated by the DMRS port indication field is within the first preset range, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS ports corresponding to the two codewords enabled by the first DCI indication; when the state value indicated by the DMRS port indication field is within the second preset range, the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to one of the two codewords enabled by the first DCI indication, and the DMRS port corresponding to the other codeword will be indicated by the second indication information, that is, the second DCI. At this time, the second DCI will also indicate the enabling of two codewords, and the state value indicated by the DMRS port indication field is within the second preset range, and the DMRS port indicated by the DMRS port indication field corresponds to the DMRS port corresponding to one of the two codewords enabled by the second DCI indication.

[0175] Referring to Table 4, in the third implementation, the first preset range of the field value of the DMRS port indication field specifically refers to: the value range of the DMRS port indication field (i.e., the bit domain field value in Table 2) is [6, 63], a closed interval, including 6 and 63; correspondingly, the second preset range specifically refers to: the value range of the DMRS port indication field is [0, 5], a closed interval, including 0 and 5. It is worth noting that the DMRS port information corresponding to the status value 0-63 of the field can be determined in a predefined manner and not necessarily in the order in the example table, that is, the DMRS port information needs to include the DMRS port combination in the example table, and the correspondence between the DMRS port combination and the bit domain field value can be any predefined manner. Among them, the number of DMRS ports corresponding to the first preset range is greater than 4, and the number of DMRS ports corresponding to the second preset range is less than or equal to 4.

[0176]

[0177]

[0178] Table 2 (1) Indication table of maximum 4 DMRS ports in the prior art

[0179]

[0180] Table 2 (2) Indication table of maximum 4 DMRS ports in the solution of the present invention

[0181]

[0182]

[0183] Table 3: DMRS port indication table for a maximum of 6 DMRS ports

[0184]

[0185]

[0186]

[0187] Table 4: DMRS port indication table for a maximum of 12 DMRS ports

[0188] In this way, after the first network device sends the first DCI to the terminal device in step S402, in step S403, the terminal device can detect the first DCI according to the search space configured by the first DCI on the time-frequency resources occupied by the corresponding PDCCH. If the first DCI detected by the terminal device precedes the second DCI, then after the terminal device detects the first DCI, it can first determine the number of enabled codewords according to the codeword information field 1 and the codeword information field 2 in the first DCI, and then determine whether it is necessary to continue detecting the second DCI according to the field value of the DMRS port indication field in the first DCI.

[0189] Specifically, when the MCS and RV fields of the two codeword information fields in the first DCI first detected by the terminal device both indicate that the codeword is enabled, and the field value indicated by the first DMRS port indication field is 0-3, the terminal device can read the right half of Table 1 and determine not to continue detecting the second DCI. The current transmission is a PDSCH transmission of more than 4 layers for a single base station. The scheduling information of the codewords corresponding to the two codeword information fields is indicated by the first DCI, and the DMRS port is also indicated by the right half of the field value 0-3 of the DMRS port indication table in the first DCI.

[0190] When the MCS and RV fields of the two codeword information fields in the first DCI detected by the terminal device first indicate that the codeword is enabled, but the field value indicated by the DM-RS port indication field is 4-31, the terminal device can read the right half of Table 1 and determine that it is necessary to continue detecting the second DCI. At this time, the current transmission is NC-JT transmission, but the field value 4-31 of the DMRS port indication field in the first DCI detected by the terminal device only indicates the DMRS port information of one codeword (i.e., the codeword currently scheduled by the first DCI), and the DMRS port information of the other codeword is indicated by the DMRS port indication field in the second DCI detected by the terminal device later.

[0191] When the MCS and RV fields of one of the two codeword information fields in the first DCI detected by the terminal device indicate that the corresponding codeword is not enabled, the terminal device can determine that the second DCI does not exist and stop the blind detection process of the DCI. At this time, the transmission is a PDSCH transmission of less than 4 layers of a single base station. The terminal device can read the left half of Table 1 and determine the DMRS port information corresponding to the enabled codeword according to the DMRS port indication information.

[0192] It should be noted that there are 31 states for the DM-RS port indication when one codeword is enabled, and when two codewords are enabled, the state in which the field takes the value 4-31 is used to indicate the DM-RS port of one codeword, corresponding to a total of 28 states, and 3 states cannot be indicated, corresponding to the values ​​3, 25, and 30 in the left half of Table 1. The reason why these three values ​​do not need to be indicated is that for value 3, the terminal device can determine whether the PDSCH is mapped on CDM group 1 based on whether the second DCI is detected. When the second DCI is detected, the PDSCH is not mapped on CDM group 1. When the second DCI is not detected, the PDSCH is mapped on CDM group 1; for values ​​25 and 30, the current protocol stipulates that the DMRS ports in a CDM group have the same quasi-co-location assumption QCL, and the DMRS ports sent by the same base station should have the same QCL assumption, and the DM-RS ports sent by different base stations should have different QCL assumptions, so the above values ​​25 and 30 do not need to be indicated.

[0193] Implementation method 4:

[0194] In implementation manner 4, the indication of "whether there is another DCI" may be carried through a mask of a cyclic redundancy check (CRC) code used by the control information bit of each DCI.

[0195] Specifically, the first DCI is carried on the physical downlink control channel PDCCH for transmission. The original control data bits on the PDCCH are first attached with CRC check bits, and then scrambled with the radio network temporary identifier (RNTI), and then sent to the channel coding module for rate matching. PDCCH is modulated according to specific criteria, such as quadrature phase shift keying (QPSK), and finally mapped to time-frequency resources.

[0196] In an embodiment of the present application, the network device can convey different indication information to the terminal device by defining the meaning of the mask of the CRC bit (also referred to as CRC mask, scrambling bit or scrambling sequence) used in the RNTI scrambling process. After detecting the DCI, the terminal device can determine the indication information of the network device by interpreting the CRC check bits and according to the meaning of the scrambling sequence defined by the network device, thereby conveying additional indication information from the network device to the terminal device without affecting the information length of the DCI. The different meanings of the CRC bit mask can be agreed upon by the terminal device and the network device in a predefined manner.

[0197] Take the scrambling sequence as 16 bits as an example. Figure 6a and Figure 6b As shown, if the terminal device determines through decoding that the mask of the CRC bits of the detected first DCI is the first scrambling sequence (such as <0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>), the first DCI can be used to indicate the existence of the second DCI. At this time, the network devices in the collaborative set have sent a total of two DCIs. If the first DCI is the first DCI detected by the terminal device, the terminal device can continue to detect the subsequent second DCI; if the terminal device determines through decoding that the mask of the CRC bits of the detected first DCI is the second scrambling sequence (such as <1,1,1,1,1,1,1,1,1,1,1,1,1,1>), the first DCI can be used to indicate that there is no second DCI. At this time, the network devices in the collaborative set have only sent one DCI (i.e., the first DCI). Therefore, the terminal device can determine that there is no subsequent second DCI and stop unnecessary blind detection process.

[0198] It should be understood that the first scrambling sequence of <0,0,0,0,0,0,0,0,0,0,0,0,0,0,0> and the second scrambling sequence of <1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1> are only one possible example; in another possible design, the first scrambling sequence may also be <0,1,0,1,0,1,0,1,0,1,0,1,0,1>, and accordingly, the second scrambling sequence may also be <1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0>; it should be understood that based on the examples in the embodiments of the present application, the first scrambling sequence and the second scrambling sequence may also have other possible variations or implementations, as long as the indication information corresponding to different scrambling sequences is pre-agreed upon by the terminal device and the network device, and the embodiments of the present application will not be listed one by one here.

[0199] Implementation method five:

[0200] In implementation method five, the indication of "whether there is another DCI within the first time unit" can be carried through the information format of DCI, thereby avoiding additional signaling overhead caused by adding a new field in the current DCI.

[0201] Specifically, taking the first DCI indicating whether the second DCI exists as an example, in a possible implementation, if the first DCI sent by the first network device satisfies the first information format, the first DCI can be used to indicate that the second DCI does not exist in the first time unit; or, in another possible implementation, if the first DCI sent by the first network device satisfies the second information format, the first DCI can be used to indicate that the second DCI exists in the first time unit. The first information format is the format with the least number of bits among multiple DCI formats used for scheduling downlink data transmission, such as format 1_0, and the second information format is the format with more bits than the first information format among multiple DCI formats used for scheduling downlink data transmission.

[0202] In the embodiment of the present application, the network device can configure the terminal device to detect a maximum of 2 DCIs through high-level signaling, and will configure the DCI format currently detected by the terminal device. For each search space, the terminal device can detect a maximum of two DCI formats. Figure 7As shown, when the network device configures the terminal device to detect both format 1_0 and format 1_1, if the terminal device detects that the first DCI satisfies format 1_0, it can stop detecting the second DCI. This is because DCI format 1_0 is a fallback transmission mode for enhancing robustness. When the terminal device detects DCI format 1_0, the fallback transmission mode does not support CoMP transmission (multi-layer transmission), so there is no second DCI, and there is no need to continue detecting the second DCI. Unnecessary blind detection processes can be stopped directly, reducing the blind detection complexity and detection power consumption of the terminal device, supporting the terminal device to perform fast PDSCH demodulation, and avoiding the additional overhead of DCI.

[0203] It should be understood that the above-mentioned implementation methods 1 to 5 only use "the first DCI indicates whether the second DCI exists" as an example to illustrate the information indication method. Since the network device cannot know the order of its search space for blind detection of the terminal device, the second DCI also needs to indicate whether the first DCI exists. Therefore, the second DCI can be indicated in the same or similar indication method as the first DCI, and the embodiments of the present application do not make specific limitations on this.

[0204] In addition, in response to the problem that the network device does not know which DCI of the two DCIs the terminal device will detect first, the embodiment of the present application also provides another solution. Specifically, the network device can limit the configuration information of the search space where the two DCIs are located. For example, the DCI carrying the indication of "whether another DCI exists" in the two DCIs is configured to be sent on a resource with a smaller search space ID, and the DCI that does not carry the indication of "whether another DCI exists" is configured to be sent on a resource with a larger search space ID. In this way, the terminal device needs to adaptively adopt the blind detection sequence from the search space ID with a smaller ID number to the search space ID with a larger ID number to detect in sequence. When the network device sends two DCIs, it only needs to carry the indication of "whether another DCI exists" in one of the DCIs, and the formats of the two DCIs may be different, thereby achieving the same purpose of terminating unnecessary detection processes in advance. For example, one of the DCIs may carry the MCS, RV, and NDI fields indicating two codewords, while the other DCI may only carry the MCS, RV, and NDI fields indicating one codeword.

[0205] In the embodiment of the present application, when the second DCI exists, and the network devices in the collaboration set use two DCIs to schedule two codewords respectively, the information contained in some fields in the two DCIs is the same, and the terminal device will decode and obtain repeated information according to the two DCIs. Here, these signaling fields indicating the same information are referred to as redundant fields, and the following Table 5 exemplifies the redundant fields in the DCI, that is, the same information indicated in the two DCIs.

[0206] Since redundant fields will bring unnecessary DCI overhead, in an embodiment of the present application, the first network device may send a third indication information to indicate that the first field in the first DCI and the first field in the second DCI indicate the same content. The first field is a signaling field included in both the first DCI and the second DCI. In a possible implementation, the third indication information may be indicated to the terminal device by the network device through high-layer signaling before sending the first DCI and the second DCI, and the third indication information may include the field name of the first field or the corresponding field index value to indicate which fields in the existing DCI format 1_1 are the first field. For example, the first field may include some or all of the fields shown in Table 5 below.

[0207] Thus, in a possible design, the terminal device can verify the DCI decoding according to these redundant signaling fields to help the terminal device determine the correctness of the detection and decoding. For example, field A is a redundant field in the DCI. When the terminal device detects the first DCI and the second DCI, if it is determined through decoding that the content indicated by each redundant signaling field in the first DCI is the same as the content indicated by the redundant signaling field in the second DCI, then the terminal device can determine that the first DCI and the second DCI have been correctly decoded, and the terminal device can receive the PDSCH according to the indications of the first DCI and the second DCI; if the terminal device determines through decoding that the content indicated by field A in the first DCI and the second DCI is different, then the terminal device can determine that the two DCI decoding errors occur and terminate the reception of the PDSCH.

[0208] In another possible design, the terminal device can perform fast decoding of the DCI based on these redundant signaling fields. For example, field B is a redundant field in the DCI. After the terminal device decodes and obtains the bit value of field B of one of the two DCIs, the terminal device can ignore the decoding process of field B when decoding the other DCI.

[0209]

[0210] Table 5 Redundant fields

[0211] Based on the same inventive concept, the present application embodiment also provides a network device, see Figure 8 As shown, it is a schematic diagram of the structure of a network device provided in an embodiment of the present application, such as Figure 8As shown, the network device includes: a processing module 810 and a transceiver module 820. The processing module 810 is used to execute the operation of the network device generating the first indication information or the second indication information, or the third indication information in the above method embodiment; the transceiver module 820 is used to execute the operation of sending the first indication information or the second indication information within the first time unit, or the operation of sending the third indication information. It should be understood that the processing module 810 in the embodiment of the present invention can be implemented by a processor or a processor-related circuit component, and the transceiver module 820 can be implemented by a transceiver or a transceiver-related circuit component.

[0212] See also Fig. 9 As shown, it is another structural diagram of the network device provided in the embodiment of the present application. Fig. 9 As shown, the network device 900 includes a processor 910, a memory 920 and a transceiver 930, wherein the memory 920 stores instructions or programs, and the processor 910 is used to execute the instructions or programs stored in the memory 920. When the instructions or programs stored in the memory 920 are executed, the processor 910 is used to execute the operations performed by the processing module 820 in the above embodiment, and the transceiver 930 is used to execute the operations performed by the transceiver module 810 in the above embodiment.

[0213] It should be understood that the network device 800 or the network device 900 according to the embodiment of the present invention may correspond to the first network device in S401 to S403 in the communication method of the embodiment of the present invention, and the operations and / or functions of the various modules in the network device 800 or the network device 900 are respectively to implement Figure 4 For the sake of brevity, the corresponding process of the method described in will not be repeated here.

[0214] The present application also provides a terminal device, see Fig.10 As shown, it is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application, such as Fig.10As shown, the terminal device includes a transceiver module 1010 and a processing module 1020. The transceiver module 1010 is used to execute the operation of the terminal device receiving the first indication information, or the second indication information, or the third indication information in the first time unit in the above method embodiment. The processing module 1020 is used to execute the operation of the terminal device detecting that the first indication information indicates that the second indication information does not exist within the first time unit in the above method embodiment, and stopping the detection of the second indication information within the first time unit. How to detect specifically and determine whether the first indication information indicates that the second indication information exists within the first time unit based on the detection result can be specifically referred to the above method embodiment, and no further details are given here. It should be understood that the processing module 1010 can be implemented by a processor or a processor-related circuit component, and the transceiver module 1020 can be implemented by a transceiver or a transceiver-related circuit component.

[0215] See also Fig.11 As shown in FIG. 1 , another schematic diagram of the structure of the terminal device provided in the embodiment of the present application is shown. Fig.11 As shown, the terminal device 1100 includes: a processor 1110, a memory 1120 and a transceiver 1130, wherein the memory 1120 stores instructions or programs, and the processor 1110 is used to execute the instructions or programs stored in the memory 1120. When the instructions or programs stored in the memory 1120 are executed, the processor 1110 is used to execute the operations performed by the processing module 1020 in the above embodiment, and the transceiver 1130 is used to execute the operations performed by the transceiver module 1010 in the above embodiment.

[0216] It should be understood that the terminal device 1000 or the terminal device 1100 according to the embodiment of the present invention may correspond to the terminal device in the communication method S401 to S403 of the embodiment of the present invention, and the operations and / or functions of the various modules in the terminal device 1000 or the terminal device 1100 are respectively to implement Figure 4 , Figure 5 , Figure 7 For the sake of brevity, the corresponding processes of each method in are not repeated here.

[0217] The present application also provides a communication device, which may be a chip, a network device (such as a base station), a terminal device, a circuit or other network device. The communication device includes one or more processors, and the one or more processors may implement Figure 4 The actions performed by the network device or terminal device in the method embodiment shown.

[0218] When the communication device is a network device, Fig.12 FIG. 1 shows a schematic diagram of the structure of a network device, such as a schematic diagram of the structure of a base station. Fig.12As shown, the base station can be applied to Figure 3 In the system shown, the functions of the network device in the above method embodiment are performed. The base station 1200 may include one or more radio frequency units, such as a remote radio unit (RRU) 1201 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU) 1202. The RRU 1201 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 12011 and a radio frequency unit 12012. The RRU 1201 part is mainly used for the transmission and reception of radio frequency signals and the conversion of radio frequency signals and baseband signals, for example, for sending the first indication information described in the above embodiment to the terminal device. The BBU 1202 part is mainly used for baseband processing, controlling the base station, etc. The RRU 1201 and the BBU 1202 may be physically arranged together or physically separated, that is, a distributed base station.

[0219] The BBU 1202 is the control center of the base station, which can also be called a processing unit, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, etc. For example, the BBU (processing unit) 1202 can be used to control the base station to execute the operation process of the network device in the above method embodiment.

[0220] In one example, the BBU 1202 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network with a single access indication (such as an LTE network), or may respectively support wireless access networks with different access standards (such as an LTE network, a 5G network, or other networks). The BBU 1202 also includes a memory 12021 and a processor 12022, and the memory 12021 is used to store necessary instructions and data. For example, the memory 5021 stores the correspondence between the codebook index and the precoding matrix in the above embodiment. The processor 12022 is used to control the base station to perform necessary actions, such as controlling the base station to execute the operation flow of the network device in the above method embodiment. The memory 12021 and the processor 12022 can serve one or more single boards. In other words, a memory and a processor may be separately set on each single board. It is also possible that multiple single boards share the same memory and processor. In addition, necessary circuits may also be set on each single board.

[0221] When the communication device is a terminal device, Fig.13 A simplified schematic diagram of the structure of a terminal device is shown. For ease of understanding and illustration, Fig.13 In this article, a mobile phone is used as an example of a terminal device. Fig.13As shown, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used to process communication protocols and communication data, as well as to control the terminal device, execute software programs, process software program data, etc. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for conversion between baseband signals and radio frequency signals and processing of radio frequency signals. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input-output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input-output devices.

[0222] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Fig.13 Only one memory and processor are shown. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device. The memory may be set independently of the processor or may be integrated with the processor, and the embodiments of the present application do not limit this.

[0223] In the embodiments of the present application, the antenna and the radio frequency circuit having transceiver functions may be regarded as the transceiver unit of the terminal device, and the processor having the processing function may be regarded as the processing unit of the terminal device. Fig.13 As shown, the terminal device includes a transceiver unit 1310 and a processing unit 1320. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. The processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, etc. Optionally, the device used to implement the receiving function in the transceiver unit 1310 may be regarded as a receiving unit, and the device used to implement the sending function in the transceiver unit 1310 may be regarded as a sending unit, that is, the transceiver unit 1310 includes a receiving unit and a sending unit. The transceiver unit may also be sometimes referred to as a transceiver, a transceiver, or a transceiver circuit, etc. The receiving unit may also be sometimes referred to as a receiver, a receiver, or a receiving circuit, etc. The sending unit may also be sometimes referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0224] It should be understood that the transceiver unit 1310 is used to perform sending operations and receiving operations on the terminal device side in the above method embodiment, and the processing unit 1320 is used to perform other operations on the terminal device except the sending and receiving operations in the above method embodiment.

[0225] For example, in one implementation, the transceiver unit 1310 is used to execute Figure 4 The sending operation of the terminal device side in the embodiment of the present application, and / or the transceiver unit 1310 is also used to perform other sending and receiving steps on the terminal device side. The processing unit 1320 is used to perform Figure 4 Step S401 in, and / or processing unit 1320 is also used to execute other processing steps on the terminal device side in the embodiment of the present application.

[0226] When the communication device is a chip, the chip includes a transceiver unit and a processing unit, wherein the transceiver unit may be an input / output circuit or a communication interface; and the processing unit may be a processor or a microprocessor or an integrated circuit integrated on the chip.

[0227] When the communication device in this embodiment is a terminal device, it can refer to Fig.14 As an example, the device can perform similar Fig.11 The function of the processor 1120. Fig.14 In the embodiment, the device includes a processor 1410, a sending data processor 1420, and a receiving data processor 1430. The processing module 1020 in the above embodiment can be Fig.14 The processor 1410 in the embodiment can perform corresponding functions. Fig.14 The sending data processor 1420 and / or the receiving data processor 1430 in the embodiment of the present invention are as follows. Fig.14 A channel encoder and a channel decoder are shown in the figure, but it can be understood that these modules do not constitute a restrictive description of this embodiment and are only illustrative.

[0228] Fig.15 Another form of this embodiment is shown. The processing device 1500 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem. The communication device in this embodiment can be used as a modulation subsystem therein. Specifically, the modulation subsystem may include a processor 1503 and an interface 1504. The processor 1503 performs the functions of the above-mentioned processing module 1020, and the interface 1504 performs the functions of the above-mentioned transceiver module 1010. As another variation, the modulation subsystem includes a memory 1506, a processor 1503, and a program stored on the memory 1506 and executable on the processor, and the processor 1503 implements the method on the terminal device side in the above-mentioned method embodiment when executing the program. It should be noted that the memory 1506 may be non-volatile or volatile, and its location may be located inside the modulation subsystem or in the processing device 1500, as long as the memory 1506 can be connected to the processor 1503.

[0229] An embodiment of the present application also provides a computer-readable storage medium, in which computer-readable instructions are stored. When a computer reads and executes the computer-readable instructions, the computer executes the method on the network device side in any of the above method embodiments.

[0230] An embodiment of the present application provides a computer program product. When a computer reads and executes the computer program product, the computer executes the method on the network device side in any of the above method embodiments.

[0231] An embodiment of the present application provides a chip, which is connected to a memory and is used to read and execute a software program stored in the memory to implement the method on the network device side in any of the above method embodiments.

[0232] An embodiment of the present application provides a computer-readable storage medium having instructions stored thereon, and when the instructions are executed, the method on the terminal device side in the above method embodiment is executed.

[0233] An embodiment of the present application provides a computer program product including instructions, which, when executed, execute the method on the terminal device side in the above method embodiment.

[0234] An embodiment of the present application provides a chip, which is connected to a memory and is used to read and execute a software program stored in the memory to implement the method on the terminal device side in any of the above method embodiments.

[0235] An embodiment of the present application provides a communication system, which includes a terminal device and a network device, wherein the terminal device can be used to execute the method on the terminal device side in any of the above method embodiments, and the network device can be used to execute the method on the network device side in any of the above method embodiments.

[0236] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0237] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (doubledatarate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM), and direct rambus RAM (DR RAM).

[0238] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) is integrated in the processor.

[0239] It should be noted that the memory described herein is intended to include, without being limited to, these and any other suitable types of memory.

[0240] It should also be understood that the first, second, third, fourth and various numerical numbers involved in this document are only distinctions made for convenience of description and are not intended to limit the scope of the present application.

[0241] It should be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0242] It should be understood that in various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0243] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0244] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0245] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0246] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0247] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0248] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0249] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: The method comprises: Sending third indication information to the terminal device, where the third indication information is used to indicate that the first field in the first indication information is the same as the content indicated by the first field in the second indication information, the first indication information is used to indicate a first downlink resource, the second indication information is used to indicate a second downlink resource, and the first downlink resource and the second downlink resource are used to carry downlink data; Send the first indication information to the terminal device.

2. The method according to claim 1, characterized in that The first field includes at least one of the following fields: Partial bandwidth BWP indication field; Rate Matching Indication field; Zero power channel state information reference signal ZP CSI-RS indication field.

3. The method according to claim 1, characterized in that The first indication information and the second indication information are located in the same time unit.

4. The method according to any one of claims 1 to 3, characterized in that: The first indication information is further used to indicate that the second indication information exists in the first time unit; The method further comprises: The second indication information is sent within the first time unit.

5. The method according to claim 4, characterized in that The first indication information includes at least two codeword information fields, and each of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled; The first indication information is used to indicate the existence of the second indication information, including: The codeword parts corresponding to at least two codeword information fields in the first indication information are enabled.

6. A communication method, characterized in that: The method comprises: receiving third indication information from the first network device, the third indication information being used to indicate that a first field in the first indication information is the same as content indicated by the first field in the second indication information, the first indication information being used to indicate a first downlink resource, the second indication information being used to indicate a second downlink resource, and the first downlink resource and the second downlink resource being used to carry downlink data; Receive the first indication information from the first network device.

7. The method according to claim 6, characterized in that The first indication information is further used to indicate that the second indication information exists within a first time unit, The method further comprises: Receive the second indication information from the first network device.

8. The method according to claim 6, characterized in that The method further comprises: According to the first field, the first indication information and the second indication information are quickly decoded, or the correctness of the decoding of the first indication information and the second indication information is verified.

9. The method according to any one of claims 6 to 8, characterized in that: The first field includes at least one of the following fields: Partial bandwidth BWP indication field; Rate Matching Indication field; Zero power channel state information reference signal ZP CSI-RS indication field.

10. The method according to any one of claims 6 to 8, characterized in that: The first indication information and the second indication information are located in the same time unit.

11. A communication device, characterized in that: The communication device comprises: a transceiver module, configured to send third indication information to a terminal device, wherein the third indication information is used to indicate that the first field in the first indication information is the same as the content indicated by the first field in the second indication information, the first indication information is used to indicate a first downlink resource, the second indication information is used to indicate a second downlink resource, and the first downlink resource and the second downlink resource are used to carry downlink data; The transceiver module is also used to send the first indication information to the terminal device.

12. The communication device according to claim 11, characterized in that: The first field includes at least one of the following fields: Partial bandwidth BWP indication field; Rate Matching Indication field; Zero power channel state information reference signal ZP CSI-RS indication field.

13. The communication device according to claim 11 or 12, characterized in that: The first indication information and the second indication information are located in the same time unit.

14. The communication device according to claim 11, characterized in that: The first indication information is further used to indicate that the second indication information exists in the first time unit; The transceiver module is also used for: The second indication information is sent within the first time unit.

15. The communication device according to claim 14, characterized in that: The first indication information includes at least two codeword information fields, and each of the at least two codeword information fields is used to indicate whether the corresponding codeword is enabled; The first indication information is used to indicate the existence of the second indication information, including: The codeword parts corresponding to at least two codeword information fields in the first indication information are enabled.

16. A communication device, characterized in that: The communication device comprises: a transceiver module, configured to receive third indication information from a first network device, wherein the third indication information is used to indicate that a first field in the first indication information is the same as a content indicated by the first field in the second indication information, the first indication information is used to indicate a first downlink resource, the second indication information is used to indicate a second downlink resource, and the first downlink resource and the second downlink resource are used to carry downlink data; The transceiver module is further used to receive the first indication information from the first network device.

17. The communication device according to claim 16, characterized in that: The first indication information is further used to indicate that the second indication information exists within a first time unit; The transceiver module is further used to receive the second indication information from the first network device.

18. The communication device according to claim 16, characterized in that: The communication device also includes: A processing module is used to quickly decode the first indication information and the second indication information according to the first field, or to verify the correctness of the decoding of the first indication information and the second indication information.

19. The communication device according to claim 16, characterized in that: The first field includes at least one of the following fields: Partial bandwidth BWP indication field; Rate Matching Indication field; Zero power channel state information reference signal ZP CSI-RS indication field.

20. The communication device according to any one of claims 16 to 19, characterized in that: The first indication information and the second indication information are located in the same time unit.

21. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes instructions, and when the instructions are called and executed by a computer, the method according to any one of claims 1 to 20 is executed.

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