CN115996421A

CN115996421A - Retransmission method and device for group public physical downlink shared channel

Info

Publication number: CN115996421A
Application number: CN202111210404.XA
Authority: CN
Inventors: 李娜; 潘学明
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2023-04-21

Abstract

The embodiment of the invention provides a retransmission method and device for a group public physical downlink shared channel, belonging to the field of terminals. The method comprises the following steps: and scheduling a first unicast PDSCH through a first PDCCH by network equipment, and retransmitting a first G-RNTI scrambled group public PDSCH, wherein CRC of the first PDCCH is scrambled by the first G-RNTI.

Description

Retransmission method and device for group public physical downlink shared channel

Technical Field

The embodiment of the invention relates to the field of communication, in particular to a retransmission method and device for a group public physical downlink shared channel.

Background

A C-RNTI scrambled physical downlink shared channel (Physical downlink shared channel PDSCH), i.e., point To Point (PTP) transmission, is scheduled for a Cell radio network temporary identity (Cell RNTI, C-RNTI) scrambled unicast physical downlink control channel (Physical downlink control channel, PDCCH), which may be a unicast initial or retransmission. When the group common PDSCH, i.e., point-to-Multipoint (PTM), is retransmitted in the form of a unicast PDSCH, if the PDSCH of the group common PDSCH is also C-RNTI scrambled PDCCH scheduled, since the hybrid automatic repeat request (Hybrid automatic repeat request, HARQ) process Identification (Identification, ID) is dynamically shared between the group announcement PDSCH and the unicast PDSCH, and meanwhile, the unicast PDSCH scheduling conditions of different User Equipments (UEs) are different, a new data indication (New data indicator, NDI) state of the same HARQ process number of different UEs is different at a certain moment, and the group common PDSCH is retransmitted in a PTP manner, which may cause a problem of error combination of unicast data in the case that the UE fails to detect the initially transmitted group common PDSCH.

Disclosure of Invention

The embodiment of the application provides a retransmission method and device for a group public physical downlink shared channel, which can avoid error combination caused by the fact that UE (user equipment) fails to detect a group public PDSCH (physical downlink shared channel) of primary transmission when a PDCCH scrambled by a C-RNTI is adopted for PTP retransmission.

In a first aspect, a retransmission method for a group common physical downlink shared channel is provided, where the method includes: the network equipment schedules a first unicast physical downlink shared channel PDSCH through a first physical downlink control channel PDCCH, and retransmits a group public PDSCH scrambled by a first group of radio network temporary identifiers G-RNTI, wherein cyclic redundancy check CRC of the first PDCCH is scrambled by the first G-RNTI.

In a second aspect, a retransmission method for a group common physical downlink shared channel is provided, where the method includes: the terminal equipment detects a first PDCCH; receiving a first unicast PDSCH scheduled through the first PDCCH upon detection of the first PDCCH; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

In a third aspect, an apparatus for retransmitting a group common physical downlink shared channel, the apparatus comprising: and the scheduling module is used for scheduling the first unicast PDSCH through a first PDCCH and carrying out retransmission of the first G-RNTI scrambled group public PDSCH, wherein the CRC of the first PDCCH is scrambled by the first G-RNTI.

In a fourth aspect, a retransmission apparatus for a group common physical downlink shared channel, the apparatus comprising: the detection module is used for detecting the first PDCCH; a processing module, configured to receive a first unicast PDSCH scheduled by the first PDCCH if the first PDCCH is detected; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

In a fifth aspect, there is provided a terminal device comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, the program or instruction when executed by the processor implementing the steps of the method according to the first aspect.

In a sixth aspect, there is provided a network device comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, the program or instruction when executed by the processor implementing the steps of the method according to the first aspect.

In a seventh aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps of the method according to the first or second aspect.

In an eighth aspect, there is provided a computer program product comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the method according to the first or second aspect.

In a ninth aspect, there is provided a chip comprising a processor and a communication interface coupled to the processor, the processor being for running a program or instructions to implement the method of the first or second aspect.

In a tenth aspect, a terminal is provided, including a processor and a communication interface, where the processor is configured to detect a first PDCCH; the communication interface is used for receiving a first unicast PDSCH scheduled by the first PDCCH under the condition that the first PDCCH is detected; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

An eleventh aspect provides a network side device, including a processor and a communication interface, where the processor is configured to schedule a first unicast physical downlink shared channel PDSCH through a first physical downlink control channel PDCCH, and perform retransmission of a group common PDSCH scrambled by a first group radio network temporary identifier G-RNTI, where a cyclic redundancy check CRC of the first PDCCH is scrambled by the first G-RNTI.

In a twelfth aspect, there is provided a computer program/program product stored in a non-volatile storage medium, the program/program product being executable by at least one processor to implement the method according to the first or second aspect.

According to the retransmission method and device for the group public physical downlink shared channel, the network equipment schedules the first unicast PDSCH through the first PDCCH to retransmit the group public PDSCH scrambled by the first G-RNTI, wherein CRC of the first PDCCH is scrambled by the first G-RNTI, and error combination caused by that UE (user equipment) leaks to detect the group public PDSCH of the primary transmission when the PDCCH scrambled by the C-RNTI is adopted for PTP retransmission can be avoided.

Drawings

Fig. 1 shows a schematic diagram of a wireless communication system to which embodiments of the present application are applicable.

Fig. 2 is a schematic flow chart of a retransmission method of a group common physical downlink shared channel according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a retransmission method of a group common physical downlink shared channel according to another embodiment of the present invention;

fig. 4 is a schematic diagram of a retransmission method of a group common physical downlink shared channel according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a retransmission apparatus for a group common physical downlink shared channel according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a retransmission apparatus for a group common physical downlink shared channel according to another embodiment of the present invention;

fig. 7 is a schematic diagram of a network device according to an embodiment of the invention;

fig. 8 is a schematic structural view of a terminal device according to another embodiment of the present invention.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

It is noted that the techniques described in embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single-carrier frequency division multiple access (Single-carrier Frequency-Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a new air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 shows a schematic diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may also be referred to as a terminal Device or a User Equipment (UE), the terminal 11 may be a terminal-side Device such as a smart watch, a mobile phone, a tablet (Tablet Personal Computer), a Laptop (lapop Computer) or a notebook (Personal Digital Assistant, PDA), a palm Computer, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet Device (Mobile Internet Device, MID), a Wearable Device (or a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), and the Wearable Device includes: a bracelet, earphone, glasses, etc. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may be a base station or a core network, wherein the base station may be called a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, a transmission and reception point (TransmittingReceivingPoint, TRP), or some other suitable terminology in the field, and the base station is not limited to a specific technical vocabulary so long as the same technical effect is achieved, and it should be noted that, in the embodiment of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

The retransmission method of the group common physical downlink shared channel provided by the embodiment of the application is described in detail below by some embodiments and application scenarios thereof with reference to the accompanying drawings.

As shown in fig. 2, one embodiment of the present invention provides a retransmission method 200 of a group common physical downlink shared channel, which may be performed by a network device, in other words, by software or hardware installed in the network device, the method comprising the steps of:

s202: the network device schedules a first unicast PDSCH through a first PDCCH, and retransmits a group public PDSCH scrambled by a first G-RNTI.

Wherein the CRC of the first PDCCH is scrambled by the first G-RNTI.

Broadcast/multicast (broadcast/multicast) features in some use scenarios, such as public safety and mission critical (public safety and mission critical), transparent IPv4/IPv6 multicast delivery (transparent IPv4/IPv6 multicast delivery), wireless software delivery (software delivery over wireless), group communication and internet of things applications (group communications and IoT applications), and the like, may provide substantial improvements, particularly in terms of system efficiency and user experience. Broadcast multicast traffic is transmitted mainly through a group common PDSCH. The UE may receive the group common PDSCH and the unicast PDSCH simultaneously. The group common PDSCH may be scheduled through a group common PDCCH, and a method of determining a control channel element (Control Channel Element, CCE) index (index) of a search space (search space) where the group common PDCCH is located is group common. The group common PDSCH is a G-RNTI scrambled PDCCH scheduled PDSCH transmitted in a common search space (Common Search Space, CSS). For the group common PDSCH, retransmission may be performed by the group common PDSCH or by the unicast PDSCH.

In one implementation, the HARQ process number of the first unicast PDSCH is the same as the HARQ process number of the group common PDSCH, and the NDI of the first unicast PDSCH is the same as the NDI of the group common PDSCH. I.e. the first unicast PDSCH is a retransmission of the group common PDSCH.

In one implementation, the first unicast PDSCH is scrambled by the first G-RNTI; or the first unicast PDSCH is C-RNTI scrambled.

In one implementation, the first PDCCH is transmitted in a user equipment specific search space (UE-specific search space, USS).

In one implementation, the base station may schedule retransmission of the group common PDSCH multiple times through the G-RNTI scrambled unicast PDCCH.

According to the retransmission method of the group public physical downlink shared channel, the first unicast physical downlink shared channel PDSCH is scheduled through the first physical downlink control channel PDCCH, retransmission of the group public PDSCH scrambled by the first group radio network temporary identifier G-RNTI is carried out, wherein the cyclic redundancy check CRC of the first PDCCH is scrambled by the first G-RNTI, error combination caused by the fact that UE (user equipment) missed detection of the initially transmitted group public PDSCH when the PTP retransmission is carried out by the PDCCH scrambled by the C-RNTI is carried out, namely retransmission is carried out by scheduling unicast PDSCH through the PDCCH scrambled by the G-RNTI in USSs, the possible error combination problem caused by scheduling unicast PDSCH by the PDCCH scrambled by the C-RNTI is avoided, and the effectiveness of a communication system is improved.

The retransmission method of the group common physical downlink shared channel according to the embodiment of the present invention is described in detail above with reference to fig. 2. A retransmission method of a group common physical downlink shared channel according to another embodiment of the present invention will be described in detail with reference to fig. 3. It will be appreciated that the interaction between the network device and the terminal device described in fig. 2 from the network device side is the same as or corresponding to the description of the terminal device side in the method shown in fig. 3, and the related description is omitted as appropriate to avoid repetition.

As shown in fig. 3, an embodiment of the present invention provides a retransmission method 300 of a group common physical downlink shared channel, which can be performed by a terminal device, in other words, by software or hardware installed in the terminal device, the method comprising the steps of:

s302: the terminal device detects a first PDCCH.

S304: and receiving a first unicast PDSCH scheduled by the first PDCCH under the condition that the first PDCCH is detected.

Wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

In one implementation, the first PDCCH is transmitted in a USS.

In one implementation, a group common PDSCH is received before the first unicast PDSCH scheduled by the first PDCCH is received, in which case the first unicast PDSCH scheduled by the first PDCCH is received, wherein the HARQ process number of the group common PDSCH is the same as the HARQ process number of the first unicast PDSCH, and the NDI of the group common PDSCH is the same as the NDI of the first unicast PDSCH. For example, the HARQ process number of the group common PDSCH is X, which is a positive integer, e.g., the

integers

0,1, …, and the new data indicates NDI as Y, e.g., 0 or 1. The first unicast PDSCH is a retransmission of the group common PDSCH. Retransmission refers to retransmission (retransmission) of a certain Transport Block (TB) to which it corresponds.

In one implementation, after the receiving the first unicast PDSCH scheduled through the first PDCCH, the method further includes: and if the decoding of the group public PDSCH fails, combining and decoding the first unicast PDSCH and the group public PDSCH.

In one implementation, a first unicast PDSCH scheduled by the first PDCCH is received without receiving a group common PDSCH before the first unicast PDSCH scheduled by the first PDCCH. The HARQ process number of the group common PDSCH is the same as the HARQ process number of the first unicast PDSCH, and the NDI of the group common PDSCH is the same as the NDI of the first unicast PDSCH. For example, the HARQ process number of the group common PDSCH is X, NDI is Y; the first unicast PDSCH is considered as an initial or new transmission, i.e., its corresponding TB is a new transmission (new TB), and is decoded. And is not combined with the unicast PDSCH scheduled by the unicast PDCCH scrambled by the previous C-RNTI.

In one implementation, after the receiving the first unicast PDSCH scheduled through the first PDCCH, the method further includes: descrambling the first unicast PDSCH through a G-RNTI; or descramble the first unicast PDSCH with a C-RNTI.

An exemplary embodiment of the present invention will be described below with reference to a description of fig. 2 from the network device side and a description of fig. 3 from the terminal device side.

As shown in fig. 4, UE-a and UE-b are within one Multicast/broadcast service (MBS) group. For a certain HARQ process ID X, UE-a has a unicast scheduling, i.e. a C-RNTI scrambled PDSCH of C-RNTI PDCCH scheduling, ndi=0. Wherein C-RNTI PDCCH, CRC, is a C-RNTI scrambled PDCCH. For UE-b, for HARQ process ID X, its unicast schedule: C-RNTI PDCCH scheduled C-RNTI scrambled PDSCH with corresponding ndi=1. The base station uses the G-RNTI-scrambled group common PDCCH to schedule the G-RNTI-scrambled group common PDSCH, i.e. PTM1 in the figure, using HARQ process ID X, ndi=1. UE-a and UE-b do group common PDCCH and group common PDSCH reception. In S302, it is assumed that UE-a detects a group common PDCCH and performs reception of a group common PDSCH, and UE-b does not detect a group common PDCCH and thus does not receive a group common PDSCH. Suppose that UE-a fails to decode the group common PDSCH and feeds back a Negative Acknowledgement (NACK) to the base station. In S202, the base station retransmits the group common PDSCH through the unicast PDSCH. The base station sends a G-RNTI scrambled unicast PDCCH in USS of UE-a and UE-b, respectively, the unicast PDSCH scheduled by the PDCCH is retransmission of the group public PDSCH, i.e. its HARQ process ID is X, ndi=1, and the scrambling RNTI of the unicast PDSCH may be a C-RNTI or a G-RNTI, for example, a protocol prescribes which RNTI or base station configuration the unicast PDSCH adopts or indicates an RNTI of the PDSCH of the UE.

In S304, for UE-a, when a G-RNTI scrambled PDCCH is detected in USS, the UE decodes the PDCCH, and if the HARQ process ID of the PDSCH scheduled by the PDCCH is X, the UE expects that the NDI indicated by the PDCCH is not flipped with respect to the NDI of the PDSCH scheduled by the previous G-RNTI scrambling group common PDCCH. When the UE configures a plurality of G-RNTIs, the G-RNTI corresponding to the unicast PDCCH should be identical to the G-RNTI of the previous group common PDSCH. And the UE receives the corresponding PDSCH according to the unicast PDCCH scrambled by the G-RNTI and performs merging decoding with the PDSCH scheduled by the public PDCCH of the previous G-RNTI scrambling group.

In S304, for UE-b, when detecting the G-RNTI scrambled PDCCH in USS, the UE decodes the PDCCH, if the HARQ process ID of the PDSCH scheduled by the PDCCH is X, since the last PDSCH of the HARQ process is the unicast PDSCH scheduled by the unicast PDCCH scrambled by the C-RNTI, that is, the group common PDSCH not scrambled by the G-RNTI, the UE considers the PDSCH scheduled by the unicast PDCCH scrambled by the G-RNTI as retransmission of a certain group common PDSCH and it misses the group common PDSCH, so the UE receives the PDSCH scheduled by the unicast PDCCH scrambled by the G-RNTI and does not combine with the unicast PDSCH scheduled by the unicast PDCCH scrambled by the previous C-RNTI, that is, the UE decodes the unicast PDSCH in a primary transmission manner.

The retransmission method of the group public physical downlink shared channel provided by the embodiment of the invention detects the first PDCCH through the terminal equipment; receiving a first unicast PDSCH scheduled through the first PDCCH upon detection of the first PDCCH; the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by the first G-RNTI, so that error combination caused by the fact that the UE fails to detect the initially transmitted group public PDSCH when the PDCCH scrambled by the C-RNTI is adopted for PTP retransmission can be avoided, namely, the unicast PDSCH is scheduled for retransmission by the PDCCH scrambled by the G-RNTI in the USS, the problem of possible error combination caused by the fact that the unicast PDSCH is scheduled by the PDCCH scrambled by the C-RNTI is avoided, and the effectiveness of a communication system is improved.

It should be noted that, in the retransmission method for a group common physical downlink shared channel provided in the embodiment of the present application, the execution body may be a retransmission device for the group common physical downlink shared channel, or a control module in the device for executing loading the method. In the embodiment of the present application, a retransmission method for loading a group common physical downlink shared channel is performed by a retransmission device for the group common physical downlink shared channel as an example, which is described in the embodiment of the present application.

Fig. 5 is a schematic structural diagram of a retransmission apparatus for a group common physical downlink shared channel according to an embodiment of the present invention. As shown in fig. 5, the retransmission apparatus 500 for a group common physical downlink shared channel includes: a scheduling module 510.

The scheduling module 510 is configured to schedule a first unicast PDSCH through a first PDCCH, and perform retransmission of a first G-RNTI scrambled group common PDSCH, where a CRC of the first PDCCH is scrambled by the first G-RNTI.

In one implementation, the HARQ process number of the first unicast PDSCH is the same as the HARQ process number of the group common PDSCH, and the new data indication NDI of the first unicast PDSCH is the same as the NDI of the group common PDSCH.

In one implementation, the first PDCCH is transmitted in a USS.

Optionally, the apparatus 500 further includes a determining module configured to determine a first unicast PDSCH, where a CRC of the first PDCCH is scrambled by the first G-RNTI.

The retransmission apparatus for the group common physical downlink shared channel in the embodiment of the present application may be an apparatus, an apparatus with an operating system or an electronic device, or may be a component, an integrated circuit, or a chip in a terminal. The apparatus or electronic device may be a mobile electronic device or a non-mobile electronic device. By way of example, the mobile electronic device may be a cell phone, tablet computer, notebook computer, palm computer, vehicle-mounted electronic device, wearable device, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), netbook or personal digital assistant (personal digital assistant, PDA), etc., and the non-mobile electronic device may be a server, network attached storage (Network Attached Storage, NAS), personal computer (personal computer, PC), television (TV), teller machine or self-service machine, etc., and the embodiments of the present application are not limited in particular.

The apparatus 500 according to the embodiment of the present invention may refer to the flow of the method 200 corresponding to the embodiment of the present invention, and each unit/module in the apparatus 500 and the other operations and/or functions described above are respectively for implementing the corresponding flow in the method 200, and may achieve the same or equivalent technical effects, which are not described herein for brevity.

Fig. 6 is a schematic structural diagram of a retransmission apparatus for a group common physical downlink shared channel according to an embodiment of the present invention. As shown in fig. 6, the retransmission apparatus 600 for a group common physical downlink shared channel includes: a detection module 610 and a processing module 620.

The detection module 610 is configured to detect a first PDCCH. The processing module 620 is configured to receive a first unicast PDSCH scheduled by the first PDCCH if the first PDCCH is detected; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

In one implementation, the first PDCCH is transmitted in a USS.

In one implementation, the processing module 620 is configured to: and under the condition that the group public PDSCH is received, a first unicast PDSCH scheduled through the first PDCCH is received, the HARQ process number of the group public PDSCH is the same as that of the first unicast PDSCH, and the NDI of the group public PDSCH is the same as that of the first unicast PDSCH.

In one implementation, the processing module 620 is configured to: and after the first unicast PDSCH scheduled by the first PDCCH is received, if the decoding of the group public PDSCH fails, combining and decoding the first unicast PDSCH and the group public PDSCH.

In one implementation, the processing module 620 is configured to: receiving a first unicast PDSCH scheduled through the first PDCCH in case that a group common PDSCH is not received; the HARQ process number of the group public PDSCH is the same as the HARQ process number of the first unicast PDSCH, and the NDI of the group public PDSCH is the same as the NDI of the first unicast PDSCH; decoding the first unicast PDSCH.

In one implementation, the processing module 620 is further configured to: descrambling a first unicast PDSCH scheduled by the first PDCCH through a G-RNTI after the receiving of the first unicast PDSCH; or descramble the first unicast PDSCH with a C-RNTI.

The apparatus 600 according to the embodiment of the present invention may refer to the flow of the method 300 corresponding to the embodiment of the present invention, and each unit/module in the apparatus 600 and the other operations and/or functions described above are respectively for implementing the corresponding flow in the method 300, and may achieve the same or equivalent technical effects, which are not described herein for brevity.

The embodiment of the application also provides network side equipment, which comprises a processor and a communication interface, wherein the processor is used for scheduling a first unicast physical downlink shared channel PDSCH through a first physical downlink control channel PDCCH and carrying out retransmission of a group public PDSCH scrambled by a first group of radio network temporary identifiers G-RNTI, wherein a cyclic redundancy check CRC of the first PDCCH is scrambled by the first G-RNTI.

In one implementation, the first PDCCH is transmitted in a user equipment specific search space USS.

The network side device embodiment corresponds to the network side device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 7, the network device 700 includes: an antenna 701, a radio frequency device 702, and a baseband device 703. The antenna 701 is connected to a radio frequency device 702. In the uplink direction, the radio frequency device 702 receives information via the antenna 701, and transmits the received information to the baseband device 703 for processing. In the downlink direction, the baseband device 703 processes information to be transmitted, and transmits the processed information to the radio frequency device 702, and the radio frequency device 702 processes the received information and transmits the processed information through the antenna 701.

The above-described band processing apparatus may be located in the baseband apparatus 703, and the method performed by the network-side device in the above embodiment may be implemented in the baseband apparatus 703, and the baseband apparatus 703 includes a processor 704 and a memory 705.

The baseband apparatus 703 may, for example, comprise at least one baseband board on which a plurality of chips are disposed, as shown, wherein one chip, for example, a processor 704, is connected to the memory 705 to invoke a program in the memory 705 to perform the network device operations shown in the above method embodiments.

The baseband apparatus 703 may further comprise a network interface 706 for interacting with the radio frequency apparatus 702, such as a common public radio interface (common public radio interface, CPRI for short).

Specifically, the network side device of the embodiment of the present invention further includes: instructions or programs stored on the memory 705 and executable on the processor 704, the processor 704 invoking instructions or programs in the memory 705 to perform:

the processor 704 invokes instructions or programs in the memory 705 to execute the methods executed by the modules shown in fig. 5, and achieve the same technical effects, and are not described herein for the sake of avoiding repetition.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the processor is used for detecting the first PDCCH by the terminal equipment; the communication interface is used for receiving a first unicast PDSCH scheduled by the first PDCCH under the condition that the first PDCCH is detected; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

In one implementation, the first PDCCH is transmitted in a USS.

In one implementation, the receiving the first unicast PDSCH scheduled through the first PDCCH includes: and under the condition that the group public PDSCH is received, receiving a first unicast PDSCH scheduled by the first PDCCH, wherein the HARQ process of the group public PDSCH is X, and the NDI is Y.

In one implementation, after the receiving the first unicast PDSCH scheduled through the first PDCCH, if the decoding of the group common PDSCH fails, the first unicast PDSCH and the group common PDSCH are combined and decoded.

In one implementation, a first unicast PDSCH scheduled through the first PDCCH is received without receiving a group common PDSCH; the HARQ process of the group public PDSCH is X, and NDI is Y; decoding the first unicast PDSCH.

The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment are applicable to the terminal embodiment and can achieve the same technical effects. Specifically, fig. 8 is a schematic hardware structure of a terminal device for implementing an embodiment of the present application.

The terminal device 800 includes, but is not limited to: at least some of the components of the radio frequency unit 801, the network module 802, the audio output unit 803, the input unit 804, the sensor 805, the display unit 806, the user input unit 807, the interface unit 808, the memory 809, and the processor 88.

Those skilled in the art will appreciate that the terminal device 800 may further include a power source (e.g., a battery) for powering the various components, and that the power source may be logically coupled to the processor 810 by a power management system to perform functions such as managing charging, discharging, and power consumption by the power management system. The terminal device structure shown in the drawings does not constitute a limitation of the terminal device, and the terminal device may include more or less components than those shown in the drawings, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 804 may include a graphics processor (Graphics Processing Unit, GPU) 8041 and a microphone 8042, with the graphics processor 8041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 807 includes a touch panel 8071 and other input devices 8072. Touch panel 8071, also referred to as a touch screen. The touch panel 8071 may include two parts, a touch detection device and a touch controller. Other input devices 8072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In this embodiment, after receiving downlink data from a network side device, the radio frequency unit 801 processes the downlink data with the processor 810; in addition, the uplink data is sent to the network side equipment. In general, the radio frequency unit 801 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 809 may be used to store software programs or instructions and various data. The memory 809 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 809 may include a high-speed random access memory, and may also include a nonvolatile memory, wherein the nonvolatile memory may be a Read-only memory (ROM), a programmable Read-only memory (ProgrammableROM, PROM), an erasable programmable Read-only memory (ErasablePROM, EPROM), an electrically erasable programmable Read-only memory (ElectricallyEPROM, EEPROM), or a flash memory. Such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device.

The processor 810 may include one or more processing units; alternatively, the processor 810 may integrate an application processor that primarily processes operating systems, user interfaces, and applications or instructions, etc., with a modem processor that primarily processes wireless communications, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 810.

Wherein, the processor 810 is configured to detect a first PDCCH by the terminal device; receiving a first unicast PDSCH scheduled through the first PDCCH upon detection of the first PDCCH; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

In one implementation, the first PDCCH is transmitted in a USS.

In one implementation, the receiving the first unicast PDSCH scheduled through the first PDCCH includes: and receiving a first unicast PDSCH scheduled through the first PDCCH under the condition that a group public PDSCH is received, wherein the HARQ process number of the group public PDSCH is the same as that of the first unicast PDSCH, and the NDI of the group public PDSCH is the same as that of the first unicast PDSCH.

In one implementation, the receiving the first unicast PDSCH scheduled through the first PDCCH includes: receiving a first unicast PDSCH scheduled through the first PDCCH in case that a group common PDSCH is not received; the HARQ process of the group public PDSCH is X, and NDI is Y; decoding the first unicast PDSCH.

In one implementation, after the receiving a first unicast PDSCH scheduled through the first PDCCH, descrambling the first unicast PDSCH through a G-RNTI; or descramble the first unicast PDSCH with a C-RNTI.

The terminal device 800 according to the embodiment of the present invention may refer to the flow of the method 300 corresponding to the embodiment of the present invention, and each unit/module in the terminal device 800 and the other operations and/or functions described above are respectively for implementing the corresponding flow in the method 300, and can achieve the same or equivalent technical effects, which are not described herein for brevity.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the processes of the embodiment of the retransmission method of the group of common physical downlink shared channels are implemented, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

The embodiment of the application further provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction, implement each process of the retransmission method embodiment of the group of common physical downlink shared channels, and achieve the same technical effect, so that repetition is avoided, and no further description is given here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.

Embodiments of the present application further provide a computer program product comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the method according to the first aspect.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A method for retransmitting a group common physical downlink shared channel, the method comprising:

the network equipment schedules a first unicast physical downlink shared channel PDSCH through a first physical downlink control channel PDCCH, and retransmits a group public PDSCH scrambled by a first group of radio network temporary identifiers G-RNTI, wherein cyclic redundancy check CRC of the first PDCCH is scrambled by the first G-RNTI.

2. The method of claim 1, wherein a hybrid automatic repeat request HARQ process number of the first unicast PDSCH is the same as a HARQ process number of the group common PDSCH, and new data of the first unicast PDSCH indicates NDI is the same as NDI of the group common PDSCH.

3. The method of claim 1 or 2, wherein,

the first unicast PDSCH is scrambled by the first G-RNTI; or alternatively

The first unicast PDSCH is C-RNTI scrambled.

4. A method according to any of claims 1 to 3, characterized in that the first PDCCH is transmitted in a user equipment specific search space USS.

5. A method for retransmitting a group common physical downlink shared channel, the method comprising:

The terminal equipment detects a first PDCCH;

receiving a first unicast PDSCH scheduled through the first PDCCH upon detection of the first PDCCH; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

6. The method of claim 5, wherein the first PDCCH is transmitted in USS.

7. The method of claim 5 or 6, wherein the receiving the first unicast PDSCH scheduled through the first PDCCH comprises:

and receiving a first unicast PDSCH scheduled through the first PDCCH under the condition that a group public PDSCH is received, wherein the HARQ process number of the group public PDSCH is the same as that of the first unicast PDSCH, and the NDI of the group public PDSCH is the same as that of the first unicast PDSCH.

8. The method of claim 7, wherein after the receiving the first unicast PDSCH scheduled through the first PDCCH, the method further comprises:

and if the decoding of the group public PDSCH fails, combining and decoding the first unicast PDSCH and the group public PDSCH.

9. The method of claim 5 or 6, wherein the receiving the first unicast PDSCH scheduled through the first PDCCH comprises:

Receiving a first unicast PDSCH scheduled through the first PDCCH in case that a group common PDSCH is not received; wherein the HARQ process number of the group common PDSCH is the same as the HARQ process number of the first unicast PDSCH, and the NDI of the group common PDSCH is the same as the NDI of the first unicast PDSCH;

decoding the first unicast PDSCH.

10. The method of any of claims 5 to 9, wherein after the receiving the first unicast PDSCH scheduled through the first PDCCH, the method further comprises:

descrambling the first unicast PDSCH through a G-RNTI; or alternatively

The first unicast PDSCH is descrambled by a C-RNTI.

11. A retransmission apparatus for a group common physical downlink shared channel, the apparatus comprising:

and the scheduling module is used for scheduling the first unicast PDSCH through a first PDCCH and carrying out retransmission of the first G-RNTI scrambled group public PDSCH, wherein the CRC of the first PDCCH is scrambled by the first G-RNTI.

12. The apparatus of claim 11, wherein a HARQ process number of the first unicast PDSCH is the same as a HARQ process number of the group common PDSCH, and an NDI of the first unicast PDSCH is the same as an NDI of the group common PDSCH.

13. The apparatus of claim 11 or 12, wherein,

the first unicast PDSCH is scrambled by the first G-RNTI; or alternatively

The first unicast PDSCH is C-RNTI scrambled.

14. The apparatus of any of claims 11 to 13, wherein the first PDCCH is transmitted in USS.

15. A retransmission apparatus for a group common physical downlink shared channel, the apparatus comprising:

the detection module is used for detecting the first PDCCH;

a processing module, configured to receive a first unicast PDSCH scheduled by the first PDCCH if the first PDCCH is detected; wherein the Cyclic Redundancy Check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

16. The apparatus of claim 15, wherein the first PDCCH is transmitted in USS.

17. The apparatus of claim 15 or 16, wherein the processing module is to:

18. The apparatus of claim 17, wherein the processing module is to: and after the first unicast PDSCH scheduled by the first PDCCH is received, if the decoding of the group public PDSCH fails, combining and decoding the first unicast PDSCH and the group public PDSCH.

19. The apparatus of claim 15 or 16, wherein the processing module is to:

receiving a first unicast PDSCH scheduled through the first PDCCH in case that a group common PDSCH is not received; wherein the HARQ process number of the group common PDSCH is the same as the HARQ process number of the first unicast PDSCH, and the NDI of the group common PDSCH is the same as the NDI of the first unicast PDSCH; decoding the first unicast PDSCH.

20. The apparatus of any of claims 15 to 19, wherein the processing module is further to: descrambling a first unicast PDSCH scheduled by the first PDCCH through a G-RNTI after the receiving of the first unicast PDSCH; or descramble the first unicast PDSCH with a C-RNTI.

21. A network device comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the method of retransmission of a group common physical downlink shared channel as claimed in any one of claims 1 to 4.

22. A terminal comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the method for retransmitting a group common physical downlink shared channel as claimed in any one of claims 5 to 11.

23. A readable storage medium, wherein a program or instructions is stored on the readable storage medium, which when executed by a processor, implements the steps of the retransmission method for a group common physical downlink shared channel according to any one of claims 1-4; or alternatively

A step of implementing a retransmission method for a group common physical downlink shared channel according to any of claims 5-11.