CN116326058A

CN116326058A - Data transmission method and device

Info

Publication number: CN116326058A
Application number: CN202080106018.3A
Authority: CN
Inventors: 高宽栋; 颜矛
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2023-06-23
Also published as: WO2022077500A1

Abstract

The application provides a data transmission method and device, relates to the technical field of communication, and is used for solving the problem of limited signal coverage caused by the fact that part of beams are not used for PDCCH transmission when the number of beams is relatively large in the prior art, and improving the coverage of base station signals. The method comprises the following steps: the network equipment transmits a physical downlink control channel PDCCH to the terminal equipment; the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.

Description

Data transmission method and device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a data transmission method and apparatus.

Background

With the continuous development of communication technology, wireless communication systems have undergone technical evolution from the first generation analog communication system to a New Radio (NR) system. In the NR system, the user equipment can search the synchronous signal and the physical broadcast channel block (synchronized signal and Physical Broadcast Channel block, SSB) broadcasted by the network equipment in the cell on the frequency point specified by the protocol in the process of initial access. After blind detection of the SSB, the user equipment receives a master information block (Master Information Block, MIB) carried in the SSB, determines a common search space (Common Search Space, CSS) of a system information block (System Information Block, SIB) 1 and a control resource set (Control Resource Set, CORESET) according to an indication of the MIB. The CORESET of SIB1 indicates the time-frequency resource of the physical downlink control channel (Physical Downlink Control Channel, PDCCH) of SIB1, and the terminal device receives the indication information of SIB1 in the PDCCH, so that the terminal device can receive the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) and acquire system information, such as SIB1, according to the time-frequency resource location indicated by the PDCCH.

In NR, information is transmitted based on beam forming, SSB received by the ue corresponds to one beam, and PDCCH and PDSCH of SIB1 are transmitted based on beams, one SSB corresponds to PDCCH of one SIB 1. Since each beam has a corresponding SSB, the start frame and the start slot of the PDCCH of SIB1 can be calculated from the index of the SSB. Therefore, the time domain position of the PDCCH of SIB1 corresponding to the adjacent indexed beam or SSB is also adjacent, and there is no time-frequency resource position of uplink signal transmission in the middle of the adjacent indexed beam. When the number of beams, that is, the number of SSBs is relatively large, SIB1 signaling of the adjacent index may cause uplink data transmission to be impossible for a long period.

In the prior art, in order to avoid the problem that uplink data transmission cannot be performed in the long period, the PDCCH of part of SIB1 may be knocked out, that is, the number of PDCCHs of SIB1 is reduced, and the PDCCH transmission is not performed by the beam with the partial index. However, since the number of PDCCHs of SIB1 is bundled with the number of SSBs, i.e., the number of beams, decreasing the number of PDCCHs of SIB1 will decrease the number of beams, i.e., the base station does not signal on the beam index. Thereby leading to the restricted coverage of PDCCH of SIB1 and reducing the coverage of base station signals.

Disclosure of Invention

The application provides a data transmission method and device, which solve the problem of limited signal coverage caused by that partial wave beams do not transmit PDCCH when the number of wave beams is relatively large in the prior art, and improve the coverage of base station signals.

In a first aspect, a data transmission method is provided, applied to a network device, and the method includes: transmitting a Physical Downlink Control Channel (PDCCH) to the terminal equipment; the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.

In the technical scheme, the terminal equipment receives the PDCCH repeatedly transmitted by the network equipment, and the SIB1 PDCCH corresponding to part of SSB can be repeatedly transmitted, so that the flexibility of resource scheduling of the network equipment can be increased, and the signal coverage range and the data transmission performance of the network equipment are improved.

In one possible design, K is preconfigured, or K is carried on the physical broadcast channel PBCH of the synchronization signal and physical broadcast channel block SSB.

In the possible implementation manner, the network device may agree through a protocol that the transmission period of the K PDCCHs corresponding to SIB1 in the network device transmission PDCCH is repeated, or may issue the configuration information K through the PBCH of the SSB, so that the network device and the terminal device may implement repeated transmission and demodulation of the PDCCH of SIB1 based on the configuration, and improve the signal coverage of the network device and the data transmission performance of the communication system.

In one possible design, PDCCHs corresponding to a plurality of system information blocks SIB1 in a transmission period of K PDCCHs are repeatedly transmitted, including: the PDCCHs of SIB1 corresponding to N SSBs in the transmission period of the K PDCCHs are repeatedly transmitted, wherein N is a positive integer greater than or equal to 1.

In one possible design, N is preconfigured, or N is carried on the physical broadcast channel PBCH of the SSB.

In the possible implementation manner, the network device may agree that the PDCCH of SIB1 corresponding to N SSBs is repeatedly transmitted in the transmission period of the network device transmitting K PDCCHs through a protocol, or may issue the configuration information N through the PBCH of the SSBs, so that the network device and the terminal device may implement repeated transmission and demodulation of the PDCCH of SIB1 based on the configuration, and improve the signal coverage of the network device and the data transmission performance of the communication system.

In one possible design, the method for transmitting the physical downlink control channel PDCCH to the terminal device specifically includes: the PDCCHs corresponding to the SIB1 are carried in the first time slot corresponding to the SSB index, and the N PDCCHs in the transmission period of the K PDCCHs are repeatedly transmitted; or, if the PDCCHs corresponding to the SIB1 are carried in the second slot corresponding to the SSB index, it indicates that N PDCCHs in the transmission period of K PDCCHs are repeatedly transmitted.

In the possible implementation manner, the network device and the terminal device can pre-configure the SIB1 PDCCH for repeated transmission to be carried in the time slot position corresponding to the SSB index, so that the network device and the terminal device can implement repeated transmission and demodulation of the PDCCH of SIB1 based on the configuration, the flexibility of resource scheduling of the network device is increased, and the signal coverage of the network device and the data transmission performance of the communication system are improved.

In one possible design, the method further includes: the downlink control information DCI corresponding to the PDCCH is the same.

In the above possible implementation manner, the downlink control information DCI corresponding to the SIB1 PDCCH that is repeatedly transmitted is also the same, so the time-frequency resource location of the PDSCH of SIB1 may be determined according to the same DCI indication. Therefore, the terminal equipment does not need to carry out more blind detection times, and can combine and demodulate based on PDCCHs of multiple repeated transmissions, thereby increasing the coverage range of the network equipment and improving the data transmission performance of a communication system.

In one possible design, the method further includes: the number of Control Channel Elements (CCEs) corresponding to the PDCCH is the same, and/or the modulation modes of the CCEs are the same, and/or the positions indicated by the CCEs in the corresponding control resource set (CORESET) are the same.

In the possible implementation manner, the plurality of repeated transmission SIB1 PDCCHs correspond to the same number of CCEs and the frequency domain position and the time domain position of the CCEs, so that the terminal equipment does not need to perform more blind detection times, thereby reducing the complexity of the terminal equipment, and in addition, the terminal equipment can also combine and demodulate based on the plurality of repeated transmission PDCCHs, thereby improving the performance of the communication system.

In a second aspect, a data transmission method is provided and applied to a terminal device, and the method includes: receiving a Physical Downlink Control Channel (PDCCH) transmitted by network equipment; the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.

In one possible design, the method for receiving the PDCCH from the network device includes: the PDCCHs corresponding to the SIB1 are carried in the first time slot corresponding to the SSB index, and the N PDCCHs in the transmission period of the K PDCCHs are repeatedly transmitted; or, if the PDCCHs corresponding to the SIB1 are carried in the second slot corresponding to the SSB index, it indicates that N PDCCHs in the transmission period of K PDCCHs are repeatedly transmitted.

In a third aspect, a communication apparatus is provided, where the communication apparatus includes a sending module configured to transmit a physical downlink control channel PDCCH to a terminal device; the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.

In a fourth aspect, there is provided a communication apparatus comprising: receiving a Physical Downlink Control Channel (PDCCH) transmitted by a network device; the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.

In a fifth aspect, there is provided a network device comprising: a processor and a transmission interface; wherein the processor is configured to execute instructions stored in a memory to implement the method according to any one of the first aspects above.

In a sixth aspect, there is provided a terminal device comprising: a processor and a transmission interface; wherein the processor is configured to execute instructions stored in a memory to implement the method of any one of the second aspects above.

In a seventh aspect, there is provided a computer readable storage medium having instructions stored therein which, when executed by a computer or processor, enable the computer or processor to perform the method of any one of the first aspects.

In an eighth aspect, there is provided a computer readable storage medium having instructions stored therein which, when executed by a computer or processor, enable the computer or processor to perform the method of any one of the second aspects above.

In a ninth aspect, there is provided a computer program product for, when run on a computer, causing the computer to perform any one of the possible implementations of the first aspect as described above.

In a tenth aspect, there is provided a computer program product which, when run on a computer, causes the computer to perform any one of the possible implementations of the second aspect as described above.

An eleventh aspect provides a communication system comprising a communication device as described in the third aspect and a device as described in the fourth aspect.

It will be appreciated that any of the above-mentioned data transmission methods, apparatuses, communication systems, computer program products or computer readable storage media may be implemented by the corresponding methods provided above, and thus, the advantages achieved by the methods may refer to the advantages in the corresponding methods provided above, and are not repeated herein.

Drawings

Fig. 1 is a schematic diagram of a random access procedure in a communication system according to an embodiment of the present application;

fig. 2 is a system architecture diagram of an implementation environment of a data transmission method according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 4 is a flow chart of a data transmission method according to an embodiment of the present application;

fig. 5 is a schematic diagram of PDCCH retransmission of SIB1 in a data transmission method according to an embodiment of the present application;

fig. 6 is a schematic diagram of a PDCCH retransmission occupied time slot in a data transmission method according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

The terms first, second, third and the like in the description and in the claims and drawings are used for distinguishing between different objects and not for limiting the specified sequence. In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

For ease of understanding the present application, related concepts related to the embodiments of the present application will now be described.

Beam: the beam may be embodied in the NR protocol as a spatial filter (spatial domain filter), or spatial filter, or spatial parameter (spatial parameter). The beam used to transmit the signal may be referred to as a transmit beam (transmission beam, tx beam), may be referred to as a spatial transmit filter (spatial domain transmission filter) or spatial transmit parameters (spatial transmission parameter); the beam used to receive the signal may be referred to as a receive beam (Rx beam), may be referred to as a spatial receive filter (spatial domain receive filter) or spatial receive parameters (spatial RX parameter).

The transmit beam may refer to a distribution of signal strengths formed in spatially different directions after signals are transmitted through the antennas, and the receive beam may refer to a distribution of signal strengths of wireless signals received from the antennas in spatially different directions.

Furthermore, the beam may be a wide beam, or a narrow beam, or other type of beam. The technique of forming the beam may be a beamforming technique or other technique. The beamforming technique may specifically be a digital beamforming technique, an analog beamforming technique, or a hybrid digital/analog beamforming technique, etc.

The beam generally corresponds to a resource or a signal, for example, when the network device measures the beam, the network device measures different beams through different resources, the terminal device feeds back the measured quality of the resource, and the network device knows the quality of the corresponding beam. During data transmission, beam information is also indicated by its corresponding time-frequency resource. For example, the network device indicates information of the PDSCH beam of the terminal device through resources in the TCI of the DCI.

Alternatively, a plurality of beams having the same or similar communication characteristics are regarded as one beam. One or more antenna ports may be included in a beam for transmitting data channels, control channels, and sounding signals, etc. One or more antenna ports forming a beam may also be considered as a set of antenna ports.

In the embodiment of the present application, if no specific description is made, the beam refers to a transmission beam of the network device. In beam measurement, each beam of the network device corresponds to a time-frequency resource, so that the beam corresponding to the resource can be uniquely identified by an index of the resource.

The beams may be represented in the standard using a quasi co-located (QCL) relationship, i.e. the different beams may be associated with a QCL relationship. The association in this application is related to what may also be referred to as mapping, correspondence. When two signals have a QCL relationship, at least one of the same delay spread, the same doppler spread, the same average gain, the same average delay, the same spatial parameters and the same beam may be used to transmit or receive the signals. The parameters of quasi co-location include: at least one of doppler spread, doppler shift, average delay, delay spread and spatial domain receive parameters.

System information block: the system information block (system information block, SIB) is included, and a plurality of system information blocks are included in one cell, and the system information blocks bear different information, for example, SIB1, mainly bear configuration information of some cells, for example, random access related information, PDCCH related information, other information block related information, UE access cell information, cell identification information and the like.

Synchronization signal block: SSB (Synchronization Signal block ) may also be referred to as SS (Synchronization Signal )/PBCH (Physical broadcast channel, physical broadcast channel) block, where SS/PBCH block includes at least one of primary synchronization signal (Primary Synchronization signal, PSS), secondary synchronization signal (Secondary Synchronization signal, SSs), physical broadcast channel (Physical broadcast channel, PBCH), demodulation reference signal (Demodulationed Reference Signal, DMRS). The signals of the SSB/PBCH blocks may be the same antenna ports.

With the development of NR communication technology, data rate and efficiency requirements are increasing. Among them, the beamforming technique is used to limit the energy of the transmission signal to a certain beam direction, thereby increasing the efficiency of signal and reception. The beam forming technology can effectively enlarge the transmission range of wireless signals and reduce signal interference, thereby achieving higher communication efficiency and obtaining higher network capacity. However, in a communication network employing the beamforming technology, it is first necessary to match a transmission beam and a reception beam so that the gain from the transmitting end to the receiving end is maximized, otherwise, relatively high communication efficiency cannot be obtained. And the beam at the base station end is required to be scanned in order to achieve full coverage. The NR protocol thus specifies that SSBs are recurring within SSB periods and that there is no QCL relationship between different SSBs.

As shown in fig. 1, the procedure of accessing the cell by the terminal device may include: the terminal device firstly blindly detects the SSB, and after blindly detecting the SSB, receives MIB (master information block, main information block) information carried in the SSB, where MIB signals include configuration information of a control resource set (CORESET, control resource set) and a common search space (common search space, CSS) of SIB1, and other indications, such as subcarrier spacing. The terminal device receives the CORESET of SIB1 according to the indication, where the CORESET of SIB1 contains the PDCCH of SIB 1. The PDCCH of SIB1 indicates relevant information such as PDSCH position of SIB1 and modulation coding strategy. The terminal device receives the PDSCH according to the indication of the PDCCH.

In NR, PDCCH of SIB1 and PDSCH of SIB1 have the same subcarrier spacing. Wherein, specific information of SIB1 is transmitted in PDSCH, and PDCCH of SIB1 indicates time-frequency resource location of PDSCH and other relevant information of PDSCH, such as modulation coding information. For the frequency band above 52.6GHz, the information is transmitted based on beamforming, so the PDCCH and PDSCH transmissions of SIB1 are also based on beamforming. Since the signal received first by the terminal device is SSB, and the SSB of the base station corresponds to each beam, the beam of SSB can be regarded as a reference standard, and the relevant information of SIB1 is also associated with the beam of SSB, that is, the beam of SIB1 is the same as the beam of SSB, and the two information are transmitted by using the same beam.

For SIB1 for multiple beams, typically, each beam has a PDCCH for the corresponding SIB1, and for example, four beams have four PDCCH time-domain positions for SIB1, which are a combination of frames, i.e., slots and coincidences. Since each beam has a corresponding SSB, the time domain position of the PDCCH of SIB1 is calculated from the index (index) number of the SSB to calculate its start frame and start slot. Therefore, the positions of the PDCCHs corresponding to the SSBs of adjacent numbers are adjacent by default, that is, the time domain positions of the PDCCHs of SIB1 corresponding to the SSBs or the beams of adjacent indexes are also adjacent, and there is no position for uplink signal transmission in the middle.

When the number of beams, that is, SSBs, is relatively large, this adjacent SIB1 relationship results in failure to transmit uplink data for a long period of time. To avoid this, in practical implementation, the PDCCH of part of SIB1 may be knocked out, that is, the number of PDCCHs of SIB1 is reduced, and the PDCCH of SIB1 of the partial beam index is not transmitted, but since the number of PDCCHs of SIB1 is bundled with the number of SSBs, that is, the number of beams. For example, the number of SSBs may be 64 at maximum under the protocol specification, and reducing the number of PDCCHs of SIB1 will reduce the number of beams, which will result in that the beams of the entire base station cannot be full, resulting in limited coverage of communication signals, and thus, transmission demodulation of PDCCHs of common channels is relatively limited.

Based on the above-mentioned problems, the embodiments of the present application provide a data transmission method, which can be applied to a communication system as shown in fig. 2. As shown in fig. 2, the communication system includes a network device and a terminal device.

The network device may be a device capable of communicating with the terminal device, and specifically may be a base station, a relay station, or an access point. For example, the base station may be a multi-beam base station or a single-beam base station. In addition, the network device may be a BTS (Base Transceiver Station ) in a GSM (Global System for Mobile Communication, global system for mobile communications) or CDMA (Code Division Multiple Access ) network, an NB (NodeB) in WCDMA (Wideband Code Division Multiple Access ), or an eNB or eNodeB (Evolutional NodeB) in LTE (Long Term Evolution ). The network device may also be a wireless controller in CRAN (Cloud Radio Access Network, cloud wireless access network) scenario, or a base station device in a future 5G network or a network device in a future evolved PLMN network.

The terminal device may be a UE (User Equipment), an access terminal, a UE unit, a UE station, a mobile station, a remote terminal, a mobile device, a UE terminal, a wireless communication device, a UE agent, a UE apparatus, or the like. An access terminal may be a cellular telephone, a cordless telephone, a SIP (Session Initiation Protocol ) phone, a WLL (Wireless Local Loop, wireless local loop) station, a PDA (Personal Digital Assistant ), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved PLMN network, etc. The device for implementing the function of the terminal device may be a conventional terminal device, or may be a device capable of supporting the terminal device to implement the function, for example, a chip system, and the device may be installed in the terminal device or used in cooperation with the terminal device. The following describes an example in which the apparatus for implementing the functions of the present application is a terminal device.

In specific implementation, each network element shown in fig. 2 includes: the terminal device, the network device may adopt the constituent structure shown in fig. 3 or include the components shown in fig. 3. Fig. 3 is a schematic structural diagram of a communication device 300 provided in the embodiment of the present application, where the communication device 300 has the function of the terminal device in the embodiment of the present application, the communication device 300 may be a terminal device or a chip or a system on a chip in the terminal device. When the communication apparatus 300 has the function of the network device described in the embodiment of the present application, the communication apparatus 300 may be a network device or a chip or a system on a chip in the network device.

As shown in fig. 3, the communication device 300 may include a processor 301, a communication line 302, and a communication interface 303. Further, the communication device 300 may also include a memory 304. The processor 301, the memory 304, and the communication interface 303 may be connected by a communication line 302.

The processor 301 may be a central processing unit (Central Processing Unit, CPU), a general purpose processor network processor (Network Processor, NP), a digital signal processor (Digital Signal Processing, DSP), a microprocessor, a microcontroller, a programmable logic device, or any combination thereof. The processor 301 may also be other means for processing, such as a circuit, device, or software module.

Communication lines 302 for conveying information between the various components included in the communications device 300.

A communication interface 303 for communicating with other devices or other communication networks. The other communication network may be an ethernet, a radio access network (Radio Access Network, RAN), a wireless local area network (Wireless Local Area Networks, WLAN), etc. The communication interface 303 may be an interface circuit, pin, radio frequency module, transceiver, or any device capable of enabling communication.

Memory 304 for storing instructions. Wherein the instructions may be computer programs.

The Memory 304 may be a Read-only Memory (ROM) or other type of static storage device capable of storing static information and/or instructions, a random access Memory (Random Access Memory, RAM) or other type of dynamic storage device capable of storing information and/or instructions, an electrically erasable programmable Read-only Memory (Electrically Erasable Programmable Read-only Memory, EEPROM), a compact disc Read-only Memory (Compact Cisc Read-only Memory, CD-ROM) or other optical disc storage, magnetic disc storage medium or other magnetic storage device, and optical disc storage includes compact discs, laser discs, optical discs, digital versatile discs, or blu-ray discs, etc.

It should be noted that, the memory 304 may exist separately from the processor 301, or may be integrated with the processor 301. Memory 304 may be used to store instructions or program code or some data, etc. The memory 304 may be located in the communication device 300 or may be located outside the communication device 300, without limitation. The processor 301 is configured to execute instructions stored in the memory 304 to implement a method provided in the following embodiments of the present application.

In one example, processor 301 may include one or more CPUs, such as CPU0 and CPU1 in fig. 2.

As an alternative implementation, the communication device 300 includes multiple processors, e.g., in addition to the processor 301 in fig. 2, a processor 307 may be included.

As an alternative implementation, the communication apparatus 300 further comprises an output device 305 and an input device 306. Illustratively, the input device 306 is a keyboard, mouse, microphone, or joystick, etc., and the output device 305 is a display screen, speaker, etc.

It should be noted that the constituent structure shown in fig. 3 does not constitute a limitation of the communication apparatus, and the communication apparatus may include more or less components than those shown in fig. 3, or may combine some components, or may be arranged in different components.

In fig. 2 and fig. 3, the embodiment of the present application provides a data transmission method, which is applied to communication transmission between a network device and a terminal device. As shown in fig. 4, the method may include:

s401: the network device transmits a Physical Downlink Control Channel (PDCCH) to the terminal device, wherein PDCCHs corresponding to a plurality of system information blocks (SIB 1) in a transmission period of K PDCCHs are repeatedly transmitted.

Wherein, the value of K can be a positive integer greater than 1. For example, at least one of 2, 3, 4, 6, 8, 12, 16, 32, etc. is possible.

In one embodiment, K may be protocol-specific or preconfigured between the network device and the terminal device. Or the network device can also bear K in the physical broadcast channel PBCH of the SSB and send the K to the terminal device.

Specifically, the base station transmits the PDCCH of SIB1, which is repeatedly transmitted in different transmission periods within the TTI period of the same SIB 1. The resource locations of the PDCCH of the SIB1 that is repeatedly transmitted are the same, and the configuration information carried by the PDCCH of the SIB1 that is repeatedly transmitted is the same.

That is, a plurality of SIB1 PDCCHs are repeatedly transmitted within a fixed time range, wherein the plurality of SIB1 PDCCHs may be PDCCHs corresponding to a specific SSB index. The fixed time range may be K SIB1 transmission periods, for example, the PDCCH transmission period of SIB1 may be 20ms, i.e., the fixed time range may be K20 ms.

Exemplary, as shown in fig. 5, a PDCCH transmission period including two SIBs 1, a PDCCH transmission period 1 and a PDCCH transmission period 2. Wherein, each transmission period comprises 4 PDCCHs of SIB1, which are respectively 1, 2, 3 and 4. Wherein the PDCCH of part or all of SIB1 may be repeatedly transmitted. For example, PDCCHs of the first two SIB1 s (1 and 2 corresponding to PDCCH transmission period 1 in the figure) in the PDCCH transmission period of the first SIB1 s and PDCCHs of the first two SIB1 s (1 and 2 corresponding to PDCCH transmission period 2 in the figure) in the PDCCH transmission period of the second SIB1 s are repeatedly transmitted.

The SIB1 transmission period indicates that SIB1 PDCCHs corresponding to all SSB indexes are transmitted for one round in the period. For example, if the number of SSBs is 8, in the transmission period of SIB1, 8 SIB1 PDCCHs corresponding to the 8 SSB indexes are all transmitted for one round; if the number of SSBs is 64, the 64 SIB1 PDCCHs corresponding to the 64 SSB indexes are all transmitted for one round in the SIB1 transmission period.

Another period of SIB1 is a transmission time interval (Transmission Time Interval, TTI) period, the TTI period of SIB1 indicating that the content of SIB1 cannot change during this period. Typically, one TTI period contains multiple SIB1 transmission periods.

Furthermore, the terminal device and the network device may agree on SIB1 PDCCHs with multiple SSB indexes to perform retransmission, and the network device and the terminal device may agree on SIB1 PDCCHs corresponding to all or part of SSB indexes to perform retransmission. For example, SIB1 PDCCHs corresponding to the indexes of the first 8 SSBs may be repeatedly transmitted, or SIB1 PDCCHs corresponding to the last 16 SSBs may be repeatedly transmitted.

In an embodiment, the PDCCH corresponding to the SIB1 s in the transmission period of the K PDCCHs is repeatedly transmitted, which may specifically include:

the PDCCH of SIB1 corresponding to N SSBs in the transmission period of the K PDCCHs is repeatedly transmitted, where the value of N may be a positive integer greater than 1.

In one embodiment, N may be protocol-defined or preconfigured between the network device and the terminal device. Or the network device may also load N in the physical broadcast channel PBCH of the SSB and send the N to the terminal device. For example, the value of N may be any one or more of 2, 4, 6, 8.

The PDCCH of the N SIB1 may be the PDCCH of SIB1 corresponding to the first N SSBs in all SSBs, or may be the PDCCH of SIB1 corresponding to the last N SSBs in all SSBs, which is not specifically limited in this application.

The starting index frame of the transmission period of SIB1 may satisfy: SFN mod 2 n=0, where SFN refers to the system frame number (System Frame Number) and mod represents the remainder function.

As shown in fig. 6, SIB1 is transmitted in a window with 2 slots as one SSB index, and each SSB index corresponds to a starting slot of the window. In the window, SIB1 PDCCH corresponding to the SSB index may be transmitted in a previous time slot or in a subsequent time slot. Therefore, in the embodiment of the application, whether the SIB1 PDCCH is repeatedly transmitted can be determined at the SSB index window position through the transmission time slot of the SIB1 PDCCH.

In an embodiment, the PDCCH corresponding to N SIB1 s in the transmission period of the K PDCCHs transmitted by the network device to the terminal device is repeatedly transmitted, and the specific indication mode may be specified by a protocol, or the network device and the terminal device are preconfigured:

in the first embodiment, if PDCCHs corresponding to the SIB1 are carried in the first slot (or slot 0) corresponding to the SSB index, N PDCCHs in a transmission period of K PDCCHs are repeatedly transmitted.

For example, as shown in fig. 6, SIB1 PDCCH in the SSB index window is located in slot 0 to indicate that PDCCH of SIB1 is retransmitted, and PDCCH of SIB1 in the window is located in slot 1 to indicate that no retransmission is performed.

In the second aspect, if PDCCHs corresponding to the SIB1 are carried in the second slot (or slot 1) corresponding to the SSB index, N PDCCHs in the transmission period of K PDCCHs are repeatedly transmitted.

For example, as shown in fig. 6, SIB1 PDCCH in the SSB index window is located in slot 1 for indicating the PDCCH retransmission of SIB1, and PDCCH of SIB1 in the window is located in slot 0 for indicating no retransmission.

In addition, the PDCCH is also used to carry downlink control information (Downlink Control Information, DCI), which may be used to schedule SIB1, which may be scrambled by a system information radio network temporary identity (System Information-Radio Network Temporary Indicator, SI-RNTI). Thus, the terminal device can receive the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) on the time-frequency resource position indicated by the DCI, and the PDSCH carries the system information. The terminal device may acquire system information, such as SIB1, according to the indication of the DCI. The terminal device may obtain configuration information of random access resources from SIB1, etc.

Accordingly, the PDCCH corresponding to N SIB 1S is repeatedly transmitted in the transmission period of the K PDCCH S in step S401, and the DCI corresponding to the PDCCH corresponding to the N SIB 1S is the same, and the position and modulation and coding scheme (Modulation and Coding Scheme, MCS) of the PDSCH corresponding to the DCI is also the same.

In one embodiment, the number of control channel elements (Control Channel Element, CCEs) corresponding to the PDCCH is the same, the locations of CCEs are the same, the content of DCI is the same, and/or the modulation scheme of CCEs is the same, and/or the locations indicated by CCEs in the corresponding control resource set CORESET are the same.

In addition, in the above step S401, the time domain positions of the N SIB1 PDCCHs are the same in the corresponding time domain positions in the transmission periods of the K SIB1 PDCCHs. That is, the N repeatedly transmitted SIB1 PDCCHs have the same frame position, the same slot position, the same symbol position, and the same frequency domain resource position within the PDCCH transmission period.

S402: the terminal equipment receives a physical downlink control channel PDCCH transmitted from the network equipment.

The PDCCH corresponding to the SIB1 s is repeatedly transmitted in the transmission period of the K PDCCHs, and specifically, the PDCCH corresponding to the SIB1 s is repeatedly transmitted in the transmission period of the K PDCCHs.

Based on the above, the values of K and N may be protocol-specified or may be preconfigured between the network device and the terminal device. Or, the configuration information of K and N may be carried on a PBCH of the SSB transmitted by the network device, and the configuration information of K and N is received through the PBCH.

In one embodiment, in step S402, the terminal device may determine whether the DMRS of the SIB1 PDCCH exists through a demodulation reference signal (Demodulation Reference Signal, DMRS) corresponding to the SIB1 PDCCH.

Specifically, the terminal device may detect PDCCH DMRS of coreset#0 by detecting SIB1 PDCCH within a window of SIB1 PDCCH corresponding to SSB index, if PDCCH DMRS exists, SIB1 PDCCH exists, and if PDCCH DMRS does not exist, SIB1 PDCCH does not exist. Wherein, within the window of SIB1 PDCCH, coreset#0 exists at this location if SIB1 PDCCH exists, and coreset#0 does not exist at this location if SIB1 PDCCH does not exist.

Alternatively, the terminal device may perform the blind detection directly on the SIB1 PDCCH without performing the discrimination using the DMRS.

In one embodiment, after step S402, the method may further include: and the terminal equipment receives the SIB1 PDSCH according to the configuration information of the SIB1 PDCCH.

As can be seen from the foregoing, the PDCCH of SIB1 is further used to carry DCI, and the terminal device may receive PDSCH at a time-frequency resource location indicated by the DCI, so that the terminal device may demodulate SIB1 according to the indication of the DCI.

In one embodiment, when the terminal device receives the SIB1 PDSCH according to the configuration information of the SIB1 PDCCH, a time domain position of the SIB1 PDSCH is configured in the DCI, and the time domain position may refer to a position of the SIB1 PDSCH corresponding to an indication of a last SIB1 PDCCH in the K transmission periods. At least one SIB1 PDCCH repeatedly transmitted in a plurality of transmission periods may be combined according to K transmission periods, or the time domain position of the last SIB1 PDCCH in the SIB1 PDCCH in which a plurality of SIB1 PDCCHs are used for combining may be referred to, thereby locating the position of the SIB1 PDSCH. The present application is not particularly limited thereto.

By the above implementation manner provided by the embodiment of the present application, the terminal device receives the PDCCH repeatedly transmitted from the network device, and the SIB1 PDCCH corresponding to the partial SSB may be repeatedly transmitted, so that the flexibility of resource scheduling of the network device may be increased. And the terminal equipment does not need to carry out more blind detection times, and can combine and demodulate based on PDCCHs of multiple repeated transmissions, thereby increasing the coverage range of the network equipment and improving the data transmission performance of a communication system. In addition, the plurality of repeated transmission SIB1 PDCCHs correspond to the same number of CCEs and the frequency domain position and the time domain position of the CCEs, so that the terminal equipment does not need to carry out more blind detection times, the complexity of the terminal equipment can be reduced, and in addition, the terminal equipment can also combine and demodulate based on the plurality of repeated transmission PDCCHs, and the performance of a communication system is improved.

In addition, as shown in fig. 7, the communication device 700 includes a sending module 701, where the sending module 701 is configured to transmit a physical downlink control channel PDCCH to a terminal device; the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.

In addition, as shown in fig. 8, the communication device 800 includes a receiving module 801, where the receiving module 801 is configured to receive a physical downlink control channel PDCCH transmitted by a network device; the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.

It should be noted that, the sending or receiving performed by the sending module or the receiving module in the above embodiments of the present application may be performed under the control of a processing unit (e.g., a processor), so that the sending or receiving actions may also be described as being performed by the processing unit (e.g., a processor) in the embodiments of the present application, which does not affect understanding of the solution by those skilled in the art.

The terminal device and the network device in the above-described respective apparatus embodiments may correspond completely to the terminal device or the network device in the method embodiments, and the corresponding steps are performed by corresponding modules or units, for example, when the apparatus is implemented in a chip, the above-described receiving module 801 may be an interface circuit of the chip for receiving signals from other chips or apparatuses. The above unit for transmitting is an interface circuit of the apparatus for transmitting signals to other apparatuses, for example, when the apparatus is implemented in a chip, the above transmitting module 701 is an interface circuit of the chip for transmitting signals to other chips or apparatuses.

It should be appreciated that the processor in embodiments of the present application may be a CPU, but may also be other general purpose processors, digital signal processing (digital signal processing, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like.

It should also be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example but not limitation, many forms of random access memory (random access memory, RAM) are available, such as Static RAM (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

The embodiment of the application also provides a communication system, which comprises: the network equipment and the terminal equipment are described above.

The embodiments of the present application also provide a computer readable medium storing a computer program code comprising instructions for executing the method performed in the network device and the terminal device in the method described above. The readable medium may be ROM or RAM, which is not limited by the embodiments of the present application.

The present application also provides a computer program product comprising instructions which, when executed, cause a terminal device and a network device to perform operations of the terminal device and the network device, respectively, corresponding to the above method.

The embodiment of the application also provides a system chip, which comprises: a processing unit, which may be, for example, a processor, and a communication unit, which may be, for example, an input/output interface, pins or circuitry, etc. The processing unit may execute the computer instructions to cause the communication device to which the chip is applied to execute the operations of the terminal device and the network device in the method provided in the embodiments of the present application.

Alternatively, any one of the communication devices provided in the embodiments of the present application may include the system chip.

Optionally, the computer instructions are stored in a storage unit.

Alternatively, the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the communication apparatus located outside the chip, such as a ROM or other type of static storage device that can store static information and instructions, a RAM, etc. The processor mentioned in any of the above may be a CPU, microprocessor, ASIC, or integrated circuit executing one or more programs for controlling the above-mentioned methods of feedback information transmission. The processing unit and the storage unit may be decoupled and respectively disposed on different physical devices, and the respective functions of the processing unit and the storage unit are implemented by wired or wireless connection, so as to support the system chip to implement the various functions in the foregoing embodiments. Alternatively, the processing unit and the memory may be coupled to the same device. It should be appreciated that the processor in the embodiments of the present application may be a CPU, but the processor may also be other general purpose processors, DSP, ASIC, 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 or the like.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in this application, it should be understood that the disclosed system, communication device, and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of 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.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.

Finally, it should be noted that: the foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A data transmission method applied to a network device, the method comprising:

transmitting a Physical Downlink Control Channel (PDCCH) to the terminal equipment;

the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.
The method of claim 1, wherein the K is pre-configured or the K is carried on a physical broadcast channel PBCH of a synchronization signal and physical broadcast channel block SSB.
The method according to claim 1 or 2, wherein PDCCHs corresponding to a plurality of system information blocks SIB1 in a transmission period of the K PDCCHs are repeatedly transmitted, comprising:

and the PDCCHs of SIB1 corresponding to N SSBs in the transmission period of the K PDCCHs are repeatedly transmitted, wherein N is a positive integer greater than or equal to 1.
The method of claim 3, wherein the N is preconfigured or carried on a physical broadcast channel, PBCH, of the SSB.
The method according to any one of claims 1-4, wherein the transmitting the physical downlink control channel PDCCH to the terminal device specifically includes:

the PDCCHs corresponding to the SIB1 are carried in the first time slot corresponding to the SSB index, and the N PDCCHs in the transmission period of the K PDCCHs are repeatedly transmitted;

or, if the PDCCHs corresponding to the SIB1 are carried in the second time slot corresponding to the SSB index, it indicates that N PDCCHs in the transmission period of the K PDCCHs are repeatedly transmitted.
The method according to any one of claims 1-5, further comprising:

and the downlink control information DCI corresponding to the PDCCH is the same.
The method according to any one of claims 1-6, further comprising:

the number of the Control Channel Elements (CCEs) corresponding to the PDCCH is the same, and/or the modulation modes of the CCEs are the same, and/or the positions indicated by the CCEs in the corresponding control resource set (CORESET) are the same.
A data transmission method applied to a terminal device, the method comprising:

Receiving a Physical Downlink Control Channel (PDCCH) transmitted by a network device;

the PDCCH corresponding to the system information block SIB1 is repeatedly transmitted in a transmission period of K PDCCHs, where K is a positive integer greater than 1.
The method of claim 8, wherein the K is pre-configured or the K is carried on a physical broadcast channel PBCH of a synchronization signal and physical broadcast channel block SSB.
The method according to claim 8 or 9, wherein PDCCHs corresponding to a plurality of system information blocks SIB1 in a transmission period of the K PDCCHs are repeatedly transmitted, comprising:

and the PDCCHs of SIB1 corresponding to N SSBs in the transmission period of the K PDCCHs are repeatedly transmitted, wherein N is a positive integer greater than or equal to 1.
The method of claim 10, wherein the N is preconfigured or carried on a physical broadcast channel, PBCH, of the SSB.
The method according to any one of claims 8-11, wherein the receiving the PDCCH from the network device comprises:

the PDCCHs corresponding to the SIB1 are carried in the first time slot corresponding to the SSB index, and the N PDCCHs in the transmission period of the K PDCCHs are repeatedly transmitted;

Or, if the PDCCHs corresponding to the SIB1 are carried in the second time slot corresponding to the SSB index, it indicates that N PDCCHs in the transmission period of the K PDCCHs are repeatedly transmitted.
The method according to any one of claims 8-12, further comprising:

and the downlink control information DCI corresponding to the PDCCH is the same.
The method according to any one of claims 8-13, further comprising:

the number of the Control Channel Elements (CCEs) corresponding to the PDCCH is the same, and/or the modulation modes of the CCEs are the same, and/or the positions indicated by the CCEs in the corresponding control resource set (CORESET) are the same.
A communication apparatus for performing the data transmission method according to any one of claims 1 to 7.
A communication device for performing the data transmission method according to any one of claims 8 to 14.
A network device, the network device comprising:

a processor and a transmission interface;

wherein the processor is configured to execute instructions stored in a memory to implement the method of any one of claims 1 to 7.
A terminal device, characterized in that the terminal device comprises:

a processor and a transmission interface;

wherein the processor is configured to execute instructions stored in the memory to implement the method of any one of claims 8 to 14.
A computer-readable storage medium having instructions stored therein, which when executed by a computer or processor, cause the computer or processor to perform the method of any of claims 1 to 7 or 8-14.
A communication system comprising a communication device according to claim 15 and a device according to claim 16.