CN112804753A

CN112804753A - Channel transmission method and device

Info

Publication number: CN112804753A
Application number: CN201911114053.5A
Authority: CN
Inventors: 朱昀
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2021-05-14

Abstract

The application discloses a channel transmission method and a channel transmission device, which are used for improving the transmission reliability of a PDCCH (physical Downlink control channel) and a PDSCH (physical Downlink shared channel) and shortening the time delay of a service flow, so that the requirements of high reliability and low time delay in URLLC (Universal resource level control Link control) service application are met. The channel sending method provided by the application comprises the following steps: determining that channel retransmission is required; the channels comprise a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH); and repeatedly transmitting the PDCCH and the PDSCH according to a preset period.

Description

Channel transmission method and device

Technical Field

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

Background

The high-reliability low-delay (URLLC) service is an important service in a 5G communication system, can be applied to a plurality of industrial communication fields such as remote driving, factory automation, smart power grids and the like in the future, and has wide application prospect. The 5G URLLC service requires extremely low data error transmission rate and extremely short transmission delay, the data packet size of the URLLC service is 32Bytes, and the packet error rate requirement is less than 10^-5The end-to-end interaction latency requirement is less than 1 ms.

In a downlink communication mechanism, a base station generally configures scheduling of a Physical Downlink Shared Channel (PDSCH), for example, a time-frequency domain position of the PDSCH, a modulation scheme used, a code rate, a number of data streams, and the like, to a User Equipment (UE) through a Physical Downlink Control Channel (PDCCH). And then the UE receives the PDSCH channel at the corresponding position according to the scheduling information. Due to the unreliability of the wireless channel transmission, the PDCCH channel or PDSCH channel inevitably has the condition of being unable to receive correctly, and the prior art usually solves the problem by retransmission, as shown in fig. 1.

The first transmitted PDCCH is not demodulated correctly by the UE (but the base station does not know at this time and still transmits PDSCH according to the scheduled scheduling), the UE misses the reception of the first PDSCH, and waits for a period of time, the base station finds that the UE does not respond to the first transmitted PDSCH, transmits PDCCH for the second time and transmits PDSCH according to the scheduled scheduling. It is seen from the above flow that, since the UE does not correctly demodulate the PDCCH transmitted for the first time, the transmission of the PDCCH and the PDSCH transmitted for the first time is wasted, and the base station finds that a period of time is required after the PDSCH transmitted for the first time is sent, so that the time delay of the whole service flow is too long, and the service which is very sensitive to the time delay, such as URLLC, is not applicable.

As shown in fig. 2 and 3, the technical solution is that the time delay can be shortened, in fig. 2, after the PDCCH is transmitted for the first time, the UE feeds back to the base station whether the PDCCH is received correctly, if the PDCCH cannot be received correctly, the base station repeatedly transmits the PDCCH to the UE, and in fig. 3, the base station directly repeatedly transmits the PDCCH to the UE.

However, the above improved scheme still has the following defects: firstly, since the PDCCH is repeatedly transmitted twice (or many times), the time delay still cannot meet the URLLC service requirement, and comparatively, in fig. 2, the UE has one more response, which results in longer time delay; secondly, if the UE can correctly demodulate the PDCCH for the first time, the second transmission of the PDCCH is unnecessary, and the delay of the procedure is increased.

Disclosure of Invention

The embodiment of the application provides a channel transmission method and a channel transmission device, which are used for improving the transmission reliability of a PDCCH (physical Downlink control channel) and a PDSCH (physical Downlink shared channel) and shortening the time delay of a service flow, so that the requirements of high reliability and low time delay in URLLC (Universal resource level Link control) service application are met.

On a network side, a channel transmission method provided in an embodiment of the present application includes:

determining that channel transmission is required; the channels comprise a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH);

and repeatedly transmitting the PDCCH and the PDSCH according to a preset period.

Optionally, in different periods, the scheduling information of the PDSCH carried on the PDCCH is the same, and/or the content of the PDSCH is the same.

Optionally, the method further comprises: and configuring the preset period to the terminal.

Optionally, the identifier of the current period is recorded in downlink control information DCI of the PDCCH.

Correspondingly, on the terminal side, the channel receiving method provided by the embodiment of the application comprises the following steps:

receiving and storing channel data transmitted by a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) by a network side according to a preset period;

if the PDCCH is correctly demodulated in the current period, the PDSCH transmitted in the current period and the PDSCH transmitted in the previous period are merged and demodulated by using the correctly demodulated PDCCH.

Optionally, the method further comprises:

and when the PDSCH is correctly demodulated, sending a response message to the network side, so that the network side stops the subsequent overall retransmission of the PDCCH and the PDSCH.

Optionally, the identifier of the current period is recorded on the downlink control information DCI of the PDCCH.

Optionally, the combining and demodulating, by using the correctly demodulated PDCCH, the PDSCH transmitted in the current period and the PDSCH transmitted in the previous period includes:

reading channel data received in a previous period of a current period by using an identifier of the current period recorded on the DCI in the PDCCH which is correctly demodulated;

and carrying out combined demodulation on the PDSCH transmitted in the current period and the PDSCH transmitted in the previous period by using the correctly demodulated DCI in the PDCCH.

On the network side, a channel transmitting apparatus provided in an embodiment of the present application includes:

a determining unit, configured to determine that channel transmission is required; the channels comprise a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH);

and the sending unit is used for repeatedly sending the PDCCH and the PDSCH according to a preset period.

On a terminal side, a channel receiving apparatus provided in an embodiment of the present application includes:

a receiving unit, configured to receive and store channel data, which is transmitted by a network side through a physical downlink control channel PDCCH and a physical downlink shared channel PDSCH, according to a preset period;

and the demodulation unit is used for merging and demodulating the PDSCH transmitted in the current period and the PDSCH transmitted in the previous period by using the correctly demodulated PDCCH if the PDCCH is correctly demodulated in the current period.

On the network side, another channel transmitting apparatus provided in the embodiment of the present application includes:

a memory for storing program instructions;

a processor for calling the program instructions stored in the memory and executing according to the obtained program:

Optionally, the processor is further configured to call a program instruction stored in the memory, and execute, according to the obtained program:

and configuring the preset period to the terminal.

At a terminal side, another channel receiving apparatus provided in an embodiment of the present application includes:

a memory for storing program instructions;

Another embodiment of the present application provides a computing device, which includes a memory and a processor, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions stored in the memory and executing any one of the above methods according to the obtained program.

Another embodiment of the present application provides a computer storage medium having stored thereon computer-executable instructions for causing a computer to perform any one of the methods described above.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a prior art solution through retransmission in the case where a PDCCH channel or a PDSCH channel cannot be correctly received;

FIG. 2 is a schematic diagram of a prior art approach for reducing latency;

FIG. 3 is a schematic diagram of another prior art approach for reducing latency;

fig. 4 is a schematic diagram of a scheme that a base station repeatedly transmits to a UE with a PDCCH and a PDSCH as a whole according to an embodiment of the present application;

fig. 5 is a schematic flowchart of a base station repeatedly transmitting a PDCCH and a PDSCH as a whole to a UE according to an embodiment of the present application;

fig. 6 is a schematic diagram of a scheme that a UE does not receive a PDCCH for the first time but correctly receives a PDCCH for the second time according to an embodiment of the present application;

fig. 7 is a schematic diagram that after two combinations, the UE can correctly demodulate the PDSCH and send an acknowledgement message ACK to the base station, and the base station stops subsequent overall transmission of the PDCCH and the PDSCH after receiving the ACK message;

fig. 8 is a flowchart illustrating a channel transmission method on a network side according to an embodiment of the present application;

fig. 9 is a flowchart illustrating a channel receiving method at a terminal side according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a channel transmitting apparatus on a network side according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a channel receiving apparatus at a terminal side according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another channel transmitting apparatus on a network side according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of another channel receiving apparatus at a terminal side according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Through the analysis of the prior art, the reason that the time delay of the prior art cannot meet the URLLC service requirement is found to be:

the PDCCH and the PDSCH are in a serial relation, and the PDCCH must be correctly demodulated first to continue receiving the PDSCH;

repeated transmission of PDCCH to improve PDCCH demodulation reliability may further increase the delay of the traffic flow in some scenarios.

Therefore, the embodiment of the present application provides a channel transmission method and apparatus, so as to reduce channel transmission delay on the premise of ensuring high reliability, thereby meeting the requirements of high reliability and low delay in URLLC service application.

The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G (Fifth Generation) system. For example, the applicable System may be a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (General Packet Radio Service, GPRS) System, a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) System, a 5G NR System, and the like. These various systems include terminal devices and network devices.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. The names of the terminal devices may also be different in different systems, for example, in a 5G system, the terminal devices may be referred to as User Equipments (UEs). Wireless terminal devices, which may be mobile terminal devices such as mobile telephones (or "cellular" telephones) and computers with mobile terminal devices, e.g., mobile devices that may be portable, pocket, hand-held, computer-included, or vehicle-mounted, communicate with one or more core networks via the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to interconvert received air frames with Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) or a Code Division Multiple Access (CDMA), may also be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may also be an evolved network device (eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station in a 5G network architecture (next generation system), and may also be a home evolved node B (HeNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like, which are not limited in the embodiments of the present application.

Various embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the display sequence of the embodiment of the present application only represents the sequence of the embodiment, and does not represent the merits of the technical solutions provided by the embodiments.

The PDCCH channel transmission method provided by the embodiment of the application meets the requirements of high reliability and low time delay in 5G high reliability low time delay (URLLC) service application, and solves the problem that the time delay is further increased due to retransmission caused by packet loss in downlink data transmission in the prior art.

As shown in fig. 4, in the embodiment of the present application, a base station repeatedly transmits a PDCCH and a PDSCH as a whole to a UE, and scheduling information of the PDCCH is the same in each repeated transmission process. The UE may receive and demodulate the PDSCH transmitted before and/or after based on scheduling information (DCI) of the PDCCH that is contended for demodulation, only by correctly receiving and demodulating the PDCCH once. If the PDSCH can be correctly demodulated in the reception process of one of the PDSCHs, an Acknowledgement (ACK) message is transmitted to the base station, thereby stopping the subsequent retransmission process.

Example 1:

as shown in fig. 5, a flow of a specific embodiment in the embodiment of the present application includes, for example:

step 1 (preparation step), the base station configures a service flow period, i.e. a period for transmitting the PDCCH and the PDSCH to the UE.

In the embodiment of the present application, the period may be referred to as a service period for short, or may also be referred to as a period for short, and the subsequent period may be a retransmission period except for the first transmission period.

Wherein the scheduling of the PDSCH by the PDCCH is consistent in each cycle.

Any period of any one service flow may be one slot (slot) or several slots in succession, and for URLLC service, it is usually one slot. In the configuration, the sequence number of the current cycle is described in Downlink Control Information (DCI) carried in each PDCCH.

And 2, the base station repeatedly transmits the PDCCH and the PDSCH to the UE in each period.

The content of the PDSCH repeatedly transmitted by the base station to the UE in each cycle is the same, the scheduling of the PDSCH included in the PDCCH is the same, and the PDCCH is recorded with a cycle identifier (for example, a sequence number) for transmitting the PDCCH, so that the terminal can read the stored channel data transmitted in the previous cycle according to the cycle identifier.

Scheduling of the URLLC service scenario is usually scheduling within a slot, i.e. the PDCCH occupies the first few symbols within the slot, and the PDSCH occupies the last few symbols.

And 3, caching data with the service flow cycle length (namely receiving data of the PDCCH and the PDSCH in each cycle) by the UE, continuously trying to receive and demodulate the PDCCH, and receiving the PDSCH transmitted in the cycle and the previous cycle according to scheduling information indicated by the PDCCH which is successfully demodulated if one PDCCH can be successfully demodulated.

If the UE can correctly demodulate the PDCCH in the first period, the PDSCH in the first period and the PDSCH in the later period are immediately received for combined demodulation;

if the UE does not correctly demodulate the PDCCH in the first period but can correctly demodulate the PDCCH in the second or later period, the buffered channel data received in the previous period can be fetched according to the period number recorded in the DCI in the correctly demodulated PDCCH, and the PDSCH in the current period and the previous period is received according to the scheduling information of the DCI, and then merged and demodulated.

The merging demodulation is to perform channel estimation on the PDSCH received in each period and obtain a symbol to be demodulated. And combining the symbol to be demodulated in the current period with the symbols to be demodulated in a plurality of previous periods, demodulating to obtain a soft bit sequence, and sending the soft bit sequence to a decoder.

And 4, if the UE receives the PDSCH in a certain period and can correctly demodulate, immediately sending a response message to the base station.

Example 2:

in the preparation step, the base station configures the period of the service flow to the UE:

as shown in fig. 6, the UE does not receive the PDCCH transmitted for the first time, but correctly receives the PDCCH transmitted for the second time. Since the UE buffers the channel data transmitted in the service flow period (here, the PDCCH reception data in each repetition period), when receiving the PDCCH transmitted for the second time, the UE can calculate the PDSCH scheduling information in the first period, and in step 3, the UE takes out the buffered PDSCH data and performs combining reception with the PDSCH transmitted for the second time.

Here, regarding when receiving the PDCCH transmitted for the second time, the UE may calculate PDSCH scheduling information of the first period, for example: after the UE correctly receives the PDCCH, the UE may obtain DCI information carried thereon by parsing, and obtain frequency domain and time domain information of the PDSCH scheduled in the current cycle by parsing, and since the PDSCH scheduling in each cycle is the same, the UE may obtain PDSCH scheduling information in the previous cycle.

And if the UE can correctly demodulate the PDSCH, sending a response message to the base station, otherwise, continuously receiving and combining subsequent PDSCH data.

Example 3:

as shown in fig. 7, this embodiment is a further optimization of embodiment 2.

If the UE can correctly demodulate the PDSCH after the two times of combination, and send an Acknowledgement (ACK) message to the base station, the base station stops the subsequent overall transmission of the PDCCH and the PDSCH after receiving the ACK message.

Therefore, frequency resources can be saved, and the system efficiency is improved.

In summary, the following steps:

referring to fig. 8, on a network side, a channel transmission method provided in an embodiment of the present application includes:

s101, determining that channel transmission is needed; the channels comprise a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH);

and S102, repeatedly transmitting the PDCCH and the PDSCH according to a preset period.

The PDCCH and the PDSCH are repeatedly transmitted according to a preset period, or the PDCCH and the PDSCH are repeatedly transmitted as a whole according to a preset period, for example:

It should be noted that, in different periods, except for the scheduling information of the PDSCH, other information in the PDCCH may be different.

In each preset period, the PDCCH and the PDSCH may be sent repeatedly continuously, that is, occupied time-frequency resources are continuous, and certainly, the PDCCH and the PDSCH may also be sent repeatedly discontinuously in each preset period, that is, an interval exists between occupied time-frequency resources. The PDCCH and PDSCH may be packed separately or in one packet.

Referring to fig. 9, on a terminal side, a channel receiving method provided in an embodiment of the present application includes:

s201, receiving and storing channel data transmitted by a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) by a network side according to a preset period;

s202, if the PDCCH is correctly demodulated in the current period, the PDSCH transmitted in the current period and the PDSCH transmitted in the previous period are merged and demodulated by using the correctly demodulated PDCCH.

Optionally, the method further comprises:

Referring to fig. 10, on the network side, a channel transmission apparatus provided in an embodiment of the present application includes:

a determining unit 11, configured to determine that channel transmission is required; the channels comprise a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH);

a sending unit 12, configured to repeatedly send the PDCCH and the PDSCH according to a preset period.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

Referring to fig. 11, on the terminal side, a channel receiving apparatus provided in an embodiment of the present application includes:

a receiving unit 21, configured to receive and store channel data, which is transmitted by a network side through a physical downlink control channel PDCCH and a physical downlink shared channel PDSCH, according to a preset period;

a demodulating unit 22, configured to, if the PDCCH is correctly demodulated in the current period, perform combined demodulation on the PDSCH transmitted in the current period and the PDSCH transmitted in the previous period by using the correctly demodulated PDCCH.

Referring to fig. 12, another channel transmission apparatus provided in the embodiment of the present application includes:

a processor 500 for reading the program in the memory 520, performing the following processes:

and repeatedly transmitting the PDCCH and the PDSCH through the transceiver 510 according to a preset period.

Optionally, the processor 500 is further configured to call the program instruction stored in the memory, and execute, according to the obtained program:

and configuring the preset period to the terminal.

A transceiver 510 for receiving and transmitting data under the control of the processor 500.

Where in fig. 12, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 500 and memory represented by memory 520. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.

The processor 500 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD).

Referring to fig. 13, another channel receiving apparatus provided in the embodiment of the present application includes:

the processor 600, which is used to read the program in the memory 620, executes the following processes:

receiving and storing channel data transmitted by a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) by a network side through a transceiver 610 according to a preset period;

Optionally, the processor 600 is further configured to call the program instruction stored in the memory, and execute, according to the obtained program:

A transceiver 610 for receiving and transmitting data under the control of the processor 600.

Where in fig. 13 the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 630 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.

Alternatively, the processor 600 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a CPLD (Complex Programmable Logic Device).

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit 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 substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The embodiment of the present application provides a computing device, which may specifically be a desktop computer, a portable computer, a smart phone, a tablet computer, a Personal Digital Assistant (PDA), and the like. The computing device may include a Central Processing Unit (CPU), memory, input/output devices, etc., the input devices may include a keyboard, mouse, touch screen, etc., and the output devices may include a Display device, such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), etc.

The memory may include Read Only Memory (ROM) and Random Access Memory (RAM), and provides the processor with program instructions and data stored in the memory. In the embodiments of the present application, the memory may be used for storing a program of any one of the methods provided by the embodiments of the present application.

The processor is used for executing any one of the methods provided by the embodiment of the application according to the obtained program instructions by calling the program instructions stored in the memory.

Embodiments of the present application provide a computer storage medium for storing computer program instructions for an apparatus provided in the embodiments of the present application, which includes a program for executing any one of the methods provided in the embodiments of the present application.

The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

The method provided by the embodiment of the application can be applied to terminal equipment and also can be applied to network equipment.

The Terminal device may also be referred to as a User Equipment (User Equipment, abbreviated as "UE"), a Mobile Station (Mobile Station, abbreviated as "MS"), a Mobile Terminal (Mobile Terminal), or the like, and optionally, the Terminal may have a capability of communicating with one or more core networks through a Radio Access Network (RAN), for example, the Terminal may be a Mobile phone (or referred to as a "cellular" phone), a computer with Mobile property, or the like, and for example, the Terminal may also be a portable, pocket, hand-held, computer-built-in, or vehicle-mounted Mobile device.

A network device may be a base station (e.g., access point) that refers to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, an evolved Node B (NodeB or eNB or e-NodeB) in LTE, or a gNB in 5G system. The embodiments of the present application are not limited.

The above method process flow may be implemented by a software program, which may be stored in a storage medium, and when the stored software program is called, the above method steps are performed.

In summary, the embodiments of the present application provide:

at the 1 st point, the PDCCH and the PDSCH are repeatedly transmitted (namely, two channels of the PDCCH and the PDSCH are simultaneously transmitted), and the scheduling and the content of the PDSCH in each repeatedly transmitted period are the same; wherein, the PDCCH and the PDSCH are also transmitted as a whole in the first repeated transmission period.

At point 2, a repetition transmission cycle is configured in advance for the UE, and a sequence number (i.e., a flag) of the current repetition transmission cycle is described in DCI of the PDCCH;

and 3, the UE stores the channel data (including PDCCH and PDSCH) received in the service flow period (including the first sending period and the subsequent retransmission period), and when one PDCCH is correctly demodulated, the stored channel data in the service flow period is used for combining and receiving the PDSCH correctly demodulated currently and the PDSCH received in the previous service flow period.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following main advantages:

1. since the PDCCH and the PDSCH are repeatedly transmitted at the same time and the scheduling of the PDSCH is the same in each cycle of the repeated transmission, the UE can obtain PDSCH information in all cycles for PDSCH reception as long as the PDCCH is correctly demodulated in one cycle. Therefore, the reliability of receiving the PDSCH is improved, and the time delay of the service flow is shortened.

2. Due to repeated transmission of the PDCCH, the UE can receive and combine the PDCCH at multiple times, and the reliability of the PDCCH is improved.

And 3, the UE can respond after correctly demodulating any one PDSCH, and can respond after receiving the same slot PDSCH scheduled by the correctly demodulated PDCCH, so that the time delay of the service process is further shortened.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A channel transmission method, comprising:

2. The method of claim 1, wherein the scheduling information of the PDSCH carried on the PDCCH is the same and/or the content of the PDSCH is the same in different periods.

3. The method of claim 1, further comprising: and configuring the preset period to the terminal.

4. The method according to claim 1, wherein an identifier of a current period is described in Downlink Control Information (DCI) of a PDCCH.

5. A channel receiving method, characterized in that the method comprises:

6. The method of claim 5, further comprising:

7. The method of claim 5, wherein an identifier of a current period is recorded on Downlink Control Information (DCI) of the PDCCH.

8. The method of claim 7, wherein the performing combined demodulation on the PDSCH transmitted in the current period and the PDSCH transmitted in the previous period by using the correctly demodulated PDCCH specifically comprises:

9. A channel transmission apparatus, comprising:

10. A channel receiving apparatus, comprising:

11. A channel transmission apparatus, comprising:

a memory for storing program instructions;

12. The apparatus of claim 11, wherein the scheduling information of the PDSCH carried on the PDCCH is the same and/or the content of the PDSCH is the same in different periods.

13. The apparatus of claim 11, wherein the processor is further configured to call program instructions stored in the memory to perform, in accordance with the obtained program:

and configuring the preset period to the terminal.

14. The apparatus according to claim 11, wherein an identifier of a current period is described in downlink control information DCI of a PDCCH.

15. A channel receiving apparatus, comprising:

a memory for storing program instructions;

16. The apparatus of claim 15, wherein the processor is further configured to call program instructions stored in the memory to perform, in accordance with the obtained program:

17. The apparatus according to claim 15, wherein an identifier of a current period is recorded on downlink control information DCI of a PDCCH.

18. The apparatus of claim 17, wherein the performing combined demodulation on the PDSCH transmitted in the current cycle and the PDSCH transmitted in the previous cycle by using the correctly demodulated PDCCH specifically comprises:

19. A computer storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1 to 8.