Method and apparatus for retransmission of group common physical downlink shared channel

Abstract

The embodiment of the application provides a kind of group common physical downlink shared channel retransmission method and device, belong to terminal field.The method comprises: by network equipment by first PDCCH scheduling first unicast PDSCH, carries out the retransmission of first G-RNTI scrambling group common PDSCH, wherein the CRC of the first PDCCH is the first G-RNTI scrambling.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and in particular to a retransmission method and apparatus for a shared physical downlink channel. Background Technology

[0002] For unicast physical downlink control channel (PDCCH) scrambled with Cell RNTI (C-RNTI) to schedule physical downlink shared channel (PDSCH) scrambled with C-RNTI, i.e. point-to-point (PTP) transmission, it may be the initial transmission or retransmission of unicast. When the group common PDSCH, i.e., point-to-multipoint (PTM), is retransmitted via unicast PDSCH, if the retransmitted group common PDSCH is also scheduled using a C-RNTI-scrambled PDCCH, the Hybrid Automatic Repeat Request (HARQ) process identification (ID) is dynamically shared between the group announcement PDSCH and the unicast PDSCH. Furthermore, the unicast PDSCH scheduling differs among different User Equipment (UEs). This can lead to situations where, at a certain moment, the New Data Indicator (NDI) status differs for the same HARQ process number across different UEs. When retransmitting the group common PDSCH using the PTP method, if the UE misses the initial transmission of the group common PDSCH, it can result in incorrect merging of unicast data. Summary of the Invention

[0003] This application provides a retransmission method and apparatus for a group common physical downlink shared channel, which can avoid erroneous merging caused by the UE missing the initial group common PDSCH when PTP retransmission is performed using a PDCCH scrambled with C-RNTI.

[0004] In a first aspect, a retransmission method for a group common physical downlink shared channel is provided. The method includes: a network device scheduling a first unicast physical downlink shared channel (PDSCH) through a first physical downlink control channel (PDCCH) to retransmit a group common PDSCH scrambled with a first group of radio network temporary identifiers (G-RNTI), wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled with the first G-RNTI.

[0005] Secondly, a retransmission method for a group of common physical downlink shared channels is provided, the method comprising: a terminal device detecting a first PDCCH; and, upon detecting the first PDCCH, receiving a first unicast PDSCH scheduled through the first PDCCH; wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

[0006] Thirdly, a retransmission device for a group common physical downlink shared channel, the device comprising: a scheduling module, configured to schedule a first unicast PDSCH via a first PDCCH to retransmit a group common PDSCH scrambled by a first G-RNTI, wherein the CRC of the first PDCCH is scrambled by the first G-RNTI.

[0007] Fourthly, a retransmission apparatus for a shared physical downlink channel, the apparatus comprising: a detection module for detecting a first PDCCH; and a processing module for receiving a first unicast PDSCH scheduled through the first PDCCH when the first PDCCH is detected; wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

[0008] Fifthly, a terminal device is provided, the terminal device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method described in the first aspect.

[0009] In a sixth aspect, a network device is provided, the network device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method described in the first aspect.

[0010] In a seventh aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method as described in the first or second aspect.

[0011] Eighthly, a computer program product is provided, the computer program product including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first or second aspect.

[0012] In a ninth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run programs or instructions to implement the methods described in the first or second aspect.

[0013] In a tenth aspect, a terminal is provided, including a processor and a communication interface, wherein the processor is configured to detect a first PDCCH; the communication interface is configured to receive a first unicast PDSCH scheduled through the first PDCCH when the first PDCCH is detected; wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

[0014] Eleventhly, a network-side device is provided, including a processor and a communication interface, wherein the processor is used to schedule a first unicast physical downlink shared channel (PDSCH) through a first physical downlink control channel (PDCCH) to retransmit a group common PDSCH scrambled with a first group of radio network temporary identifiers (G-RNTI), wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled with the first G-RNTI.

[0015] In a twelfth aspect, a computer program / program product is provided, the computer program / program product being stored in a non-volatile storage medium, the program / program product being executed by at least one processor to implement the method as described in the first or second aspect.

[0016] This invention provides a retransmission method and apparatus for a group common physical downlink shared channel. The method involves a network device scheduling a first unicast PDSCH via a first PDCCH to retransmit a group common PDSCH scrambled with a first G-RNTI. The CRC of the first PDCCH is scrambled with the first G-RNTI, which avoids erroneous merging caused by the UE missing the initial group common PDSCH during PTP retransmission using a PDCCH scrambled with C-RNTI. Attached Figure Description

[0017] Figure 1 This diagram illustrates a wireless communication system to which embodiments of this application may be applied.

[0018] Figure 2 This is a schematic flowchart of a retransmission method for a group common physical downlink shared channel according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic flowchart of a retransmission method for a group common physical downlink shared channel according to another embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a retransmission method for a group common physical downlink shared channel according to an embodiment of the present invention;

[0021] Figure 5This is a schematic diagram of the retransmission device for a group common physical downlink shared channel according to another embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the retransmission device for a group common physical downlink shared channel according to another embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of a network device according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of a terminal device according to another embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and NR terminology is used in most of the following description; however, these technologies can also be applied to applications beyond NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0028] Figure 1This diagram illustrates a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as a terminal device or user equipment (UE). The terminal 11 can be a smartwatch, mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), etc. Wearable devices include wristbands, headphones, glasses, etc. It should be noted that this application does not limit the specific type of terminal 11. Network-side device 12 can be a base station or a core network. The base station can be referred to as a node B, evolved node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, WLAN access point, WiFi node, transmitting and receiving point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only the base station in the NR system is used as an example, but the specific type of base station is not limited.

[0029] The retransmission method for the group common physical downlink shared channel provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0030] like Figure 2 As shown, one embodiment of the present invention provides a retransmission method 200 for a group of common physical downlink shared channels. This method can be executed by a network device; in other words, it can be executed by software or hardware installed on the network device. The method includes the following steps:

[0031] S202: The network device schedules the first unicast PDSCH through the first PDCCH to retransmit the group common PDSCH scrambled by the first G-RNTI.

[0032] The CRC of the first PDCCH is scrambled by the first G-RNTI.

[0033] In certain use cases, such as public safety and mission-critical applications, transparent IPv4 / IPv6 multicast delivery, software delivery over wireless, and group communications and IoT applications, broadcast / multicast features can provide substantial improvements, especially in system efficiency and user experience. Broadcast / multicast services are primarily transmitted via a group common PDSCH. A UE can simultaneously receive both group common PDSCH and unicast PDSCH. The group common PDSCH can be scheduled using a group common PDCCH, and the method for determining the Control Channel Element (CCE) index of the search space containing the group common PDSCH is group common. The group common PDSCH is a PDSCH scheduled from a G-RNTI-scrambled PDCCH transmitted in the Common Search Space (CSS). Retransmission of the group common PDSCH can be performed via either the group common PDSCH or the unicast PDSCH.

[0034] 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. That is, the first unicast PDSCH is a retransmission of the group common PDSCH.

[0035] In one implementation, the first unicast PDSCH is scrambled by the first G-RNTI; or the first unicast PDSCH is scrambled by the C-RNTI.

[0036] In one implementation, the first PDCCH is transmitted in the user equipment-specific search space (USS).

[0037] In one implementation, the base station can schedule the retransmission of the group common PDSCH multiple times using the unicast PDCCH scrambled by G-RNTI.

[0038] The retransmission method for the group common physical downlink shared channel provided in this invention retransmits the group common PDSCH scrambled with the first group radio network temporary identifier (G-RNTI) by scheduling the first unicast physical downlink shared channel (PDSCH) through the first physical downlink control channel (PDCCH). The cyclic redundancy check (CRC) of the first PDCCH is scrambled with the first G-RNTI, which avoids the erroneous merging caused by the UE missing the initial group common PDSCH when using the C-RNTI scrambled PDCCH for PTP retransmission. In other words, by scheduling the unicast PDSCH through the G-RNTI scrambled PDCCH in the USS for retransmission, the potential erroneous merging problem caused by using the C-RNTI scrambled PDCCH to schedule the unicast PDSCH is avoided, thus improving the effectiveness of the communication system.

[0039] The above combination Figure 2 A retransmission method for a group common physical downlink shared channel according to an embodiment of the present invention is described in detail below. The following will be combined with... Figure 3 A retransmission method for a group common physical downlink shared channel according to another embodiment of the present invention is described in detail. It is understood that... Figure 2 The interaction between network devices and terminal devices, as described from the network device side, and Figure 3 The descriptions of the terminal device side in the methods shown are the same or corresponding; to avoid repetition, relevant descriptions are omitted as appropriate.

[0040] like Figure 3 As shown, one embodiment of the present invention provides a retransmission method 300 for a group of common physical downlink shared channels. This method can be executed by a terminal device; in other words, the method can be executed by software or hardware installed on the terminal device. The method includes the following steps:

[0041] S302: Terminal equipment detects the first PDCCH.

[0042] S304: If the first PDCCH is detected, receive the first unicast PDSCH scheduled through the first PDCCH.

[0043] The cyclic redundancy check (CRC) of the first PDCCH is scrambled by the first G-RNTI.

[0044] In one implementation, the first PDCCH is sent in the USS.

[0045] In one implementation, a group common PDSCH is received before the first unicast PDSCH scheduled via the first PDCCH is received. In this case, the first unicast PDSCH scheduled via 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, where X is a positive integer, such as 0, 1, ..., 15, and the New Data Indicator NDI is Y, where Y is, for example, 0 or 1. The first unicast PDSCH is a retransmission of the group common PDSCH. A retransmission refers to a retransmission of a corresponding transport block (TB).

[0046] In one implementation, after receiving the first unicast PDSCH scheduled by the first PDCCH, the method further includes: if the group common PDSCH decoding fails, then merging and decoding the first unicast PDSCH and the group common PDSCH.

[0047] In one implementation, if no group common PDSCH has been received before receiving the first unicast PDSCH scheduled through the first PDCCH, the first unicast PDSCH scheduled through the first PDCCH is received. 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, if the HARQ process number of the group common PDSCH is X and the NDI is Y, then the first unicast PDSCH is considered a new transmission, i.e., its corresponding TB is a new TB, and the first unicast PDSCH is decoded. Furthermore, it is not merged with the unicast PDSCH scheduled by the previously C-RNTI-scrambled unicast PDCCH.

[0048] In one implementation, after receiving the first unicast PDSCH scheduled via the first PDCCH, the method further includes: descrambling the first unicast PDSCH via G-RNTI; or descrambling the first unicast PDSCH via C-RNTI.

[0049] The following combination Figure 2 From the perspective of network devices Figure 3 The embodiments of the present invention will be described by way of example from the description of the terminal device side.

[0050] like Figure 4As shown, UE-a and UE-b are in a Multicast / Broadcast Service (MBS) group. For a certain HARQ process ID X, UE-a has unicast scheduling, i.e., C-RNTI scrambled PDSCH scheduled by C-RNTI PDCCH, with NDI = 0. Here, C-RNTI PDCCH, i.e., CRC, is a C-RNTI scrambled PDSCH. For UE-b, for HARQ process ID X, its unicast scheduling is also C-RNTI scrambled PDSCH scheduled by C-RNTI PDCCH, with corresponding NDI = 1. The base station uses G-RNTI scrambled group common PDSCH to schedule G-RNTI scrambled group common PDSCH, i.e., PTM1 in the figure, which uses HARQ process ID X, with NDI = 1. UE-a and UE-b receive group common PDCCH and group common PDSCH. In S302, assume UE-a detects the group common PDCCH and receives the group common PDSCH, while UE-b does not detect the group common PDCCH and therefore does not receive it. Assume UE-a fails to decode the group common PDSCH and sends a negative acknowledgment (NACK) to the base station. In S202, the base station retransmits the group common PDSCH via unicast PDSCH. The base station sends G-RNTI-scrambled unicast PDCCHs in the USS of both UE-a and UE-b. The unicast PDSCH scheduled by this PDCCH is a retransmission of the aforementioned group common PDSCH, i.e., its HARQ process ID is X, NDI = 1, and the scrambling RNTI of this unicast PDSCH can be either C-RNTI or G-RNTI. For example, the protocol specifies which RNTI to use for this unicast PDSCH, or the base station configures or instructs the UE on the RNTI of this PDSCH.

[0051] In S304, for UE-a, when a G-RNTI-scrambled PDCCH is detected in the USS, the UE decodes the PDCCH. If the HARQ process ID of the PDSCH scheduled by this PDCCH is X, the UE expects that the NDI indicated by this PDCCH has not flipped relative to the NDI of the PDSCH scheduled by the previous G-RNTI-scrambled group common PDCCH. When the UE has configured multiple G-RNTIs, the G-RNTI corresponding to the unicast PDCCH should be the same as the G-RNTI of the previous group common PDSCH. The UE receives the corresponding PDSCH based on the unicast PDCCH scrambled by this G-RNTI and merges and decodes it with the PDSCH scheduled by the previous G-RNTI-scrambled group common PDCCH.

[0052] In S304, for UE-b, when a G-RNTI scrambled PDCCH is detected in the USS, the UE decodes the PDCCH. If the HARQ process ID of the PDSCH scheduled by the PDCCH is X, since the previous PDSCH of the HARQ process was a unicast PDSCH scheduled by a C-RNTI scrambled unicast PDCCH, i.e., there is no G-RNTI scrambled group common PDSCH, the UE considers the PDSCH scheduled by the G-RNTI scrambled unicast PDCCH to be a retransmission of a certain group common PDSCH, and it missed detecting that group common PDSCH. Therefore, the UE receives the PDSCH scheduled by the G-RNTI scrambled unicast PDCCH, and does not merge it with the unicast PDSCH scheduled by the previous C-RNTI scrambled unicast PDCCH. That is, the UE decodes the unicast PDSCH in the manner of the initial transmission.

[0053] The retransmission method for the group common physical downlink shared channel provided in this invention involves the terminal device detecting a first PDCCH; upon detecting the first PDCCH, receiving a first unicast PDSCH scheduled through the first PDCCH; wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled by a first G-RNTI, which can avoid erroneous merging caused by the UE missing the initial transmission of the group common PDSCH when using a C-RNTI scrambled PDCCH for PTP retransmission, i.e., retransmitting by scheduling the unicast PDSCH through the G-RNTI scrambled PDCCH in the USS, avoiding the possible erroneous merging problem caused by using a C-RNTI scrambled PDCCH to schedule the unicast PDSCH, and improving the effectiveness of the communication system.

[0054] It should be noted that the retransmission method for the group common physical downlink shared channel provided in this application embodiment can be executed by a group common physical downlink shared channel retransmission device, or a control module in that device for executing the above-described method. This application embodiment uses the execution of the group common physical downlink shared channel retransmission method by a group common physical downlink shared channel retransmission device as an example to illustrate the group common physical downlink shared channel retransmission method provided in this application embodiment.

[0055] Figure 5 This is a schematic diagram of the structure of a retransmission device for a shared physical downlink channel according to an embodiment of the present invention. Figure 5 As shown, the retransmission device 500 for the group common physical downlink shared channel includes: a scheduling module 510.

[0056] The scheduling module 510 is used to schedule the first unicast PDSCH through the first PDCCH to retransmit the group common PDSCH scrambled by the first G-RNTI, wherein the CRC of the first PDCCH is scrambled by the first G-RNTI.

[0057] 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 Indicator (NDI) of the first unicast PDSCH is the same as the NDI of the group common PDSCH.

[0058] In one implementation, the first unicast PDSCH is scrambled by the first G-RNTI; or the first unicast PDSCH is scrambled by the C-RNTI.

[0059] In one implementation, the first PDCCH is sent in the USS.

[0060] Optionally, the device 500 further includes a determining module for determining a first unicast PDSCH, wherein the CRC of the first PDCCH is scrambled by the first G-RNTI.

[0061] The retransmission device for the shared physical downlink channel in this application embodiment can be a device, a device or electronic device with an operating system, or a component, integrated circuit, or chip in a terminal. This device or electronic device can be a mobile electronic device or a non-mobile electronic device. For example, mobile electronic devices can be mobile phones, tablets, laptops, PDAs, in-vehicle electronic devices, wearable devices, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc., while non-mobile electronic devices can be servers, network attached storage (NAS), personal computers (PCs), televisions (TVs), ATMs, or self-service machines, etc. This application embodiment does not impose specific limitations.

[0062] The apparatus 500 according to the embodiments of the present invention can refer to the flow of the method 200 corresponding to the embodiments of the present invention. Furthermore, each unit / module in the apparatus 500 and the other operations and / or functions described above are respectively implemented to achieve the corresponding flow in the method 200 and can achieve the same or equivalent technical effects. For the sake of brevity, they will not be described in detail here.

[0063] Figure 6This is a schematic diagram of the structure of a retransmission device for a shared physical downlink channel according to an embodiment of the present invention. Figure 6 As shown, the retransmission device 600 for the group common physical downlink shared channel includes: a detection module 610 and a processing module 620.

[0064] The detection module 610 is used to detect the first PDCCH. The processing module 620 is used to receive the first unicast PDSCH scheduled through the first PDCCH when the first PDCCH is detected; wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled by the first G-RNTI.

[0065] In one implementation, the first PDCCH is sent in the USS.

[0066] In one implementation, the processing module 620 is configured to: upon receiving a group common PDSCH, receive a first unicast PDSCH scheduled through the first PDCCH, 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.

[0067] In one implementation, the processing module 620 is configured to: after receiving the first unicast PDSCH scheduled by the first PDCCH, if the group common PDSCH decoding fails, merge and decode the first unicast PDSCH and the group common PDSCH.

[0068] In one implementation, the processing module 620 is configured to: receive a first unicast PDSCH scheduled through the first PDCCH when no group common PDSCH is received; 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; and decode the first unicast PDSCH.

[0069] In one implementation, the processing module 620 is further configured to: after receiving the first unicast PDSCH scheduled by the first PDCCH, descramble the first unicast PDSCH by G-RNTI; or descramble the first unicast PDSCH by C-RNTI.

[0070] The retransmission device for the shared physical downlink channel in this application embodiment can be a device, a device or electronic device with an operating system, or a component, integrated circuit, or chip in a terminal. This device or electronic device can be a mobile electronic device or a non-mobile electronic device. For example, mobile electronic devices can be mobile phones, tablets, laptops, PDAs, in-vehicle electronic devices, wearable devices, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc., while non-mobile electronic devices can be servers, network attached storage (NAS), personal computers (PCs), televisions (TVs), ATMs, or self-service machines, etc. This application embodiment does not impose specific limitations.

[0071] The apparatus 600 according to an embodiment of the present invention can refer to the flow of the method 300 corresponding to an embodiment of the present invention. Furthermore, each unit / module in the apparatus 600 and the other operations and / or functions described above are respectively implemented to achieve the corresponding flow in the method 300 and can achieve the same or equivalent technical effects. For the sake of brevity, they will not be described in detail here.

[0072] This application embodiment also provides a network-side device, including a processor and a communication interface. The processor is used to schedule a first unicast physical downlink shared channel (PDSCH) through a first physical downlink control channel (PDCCH) to retransmit a group common PDSCH scrambled with a first group of radio network temporary identifiers (G-RNTI), wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled with the first G-RNTI.

[0073] 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 Indicator (NDI) of the first unicast PDSCH is the same as the NDI of the group common PDSCH.

[0074] In one implementation, the first unicast PDSCH is scrambled by the first G-RNTI; or the first unicast PDSCH is scrambled by the C-RNTI.

[0075] In one implementation, the first PDCCH is sent in the User Equipment Specific Search Space (USS).

[0076] This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiment can be applied to this network-side device embodiment and can achieve the same technical effect.

[0077] Specifically, embodiments of this application also provide a network-side device. For example... Figure 7 As shown, the network device 700 includes an antenna 701, a radio frequency (RF) device 702, and a baseband device 703. The antenna 701 is connected to the RF device 702. In the uplink direction, the RF device 702 receives information through the antenna 701 and transmits the received information to the baseband device 703 for processing. In the downlink direction, the baseband device 703 processes the information to be transmitted and sends it to the RF device 702. The RF device 702 processes the received information and transmits it through the antenna 701.

[0078] The aforementioned frequency band processing device can be located in the baseband device 703. The method executed by the network-side device in the above embodiments can be implemented in the baseband device 703, which includes a processor 704 and a memory 705.

[0079] The baseband device 703 may include at least one baseband board, on which multiple chips are disposed, as shown in the figure. One of the chips is, for example, a processor 704, which is connected to a memory 705 to call the program in the memory 705 and execute the network device operation shown in the above method embodiment.

[0080] The baseband device 703 may also include a network interface 706 for exchanging information with the radio frequency device 702, such as a common public radio interface (CPRI).

[0081] Specifically, the network-side device in this embodiment of the invention further includes: instructions or programs stored in memory 705 and executable on processor 704, wherein processor 704 calls the instructions or programs in memory 705 to execute:

[0082] Processor 704 executes instructions or programs stored in memory 705. Figure 5 The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0083] This application embodiment also provides a terminal, including a processor and a communication interface. The processor is used for the terminal device to detect a first PDCCH; the communication interface is used to receive a first unicast PDSCH scheduled through the first PDCCH when the first PDCCH is detected; wherein, the cyclic redundancy check (CRC) of the first PDCCH is scrambled by a first G-RNTI.

[0084] In one implementation, the first PDCCH is sent in the USS.

[0085] In one implementation, receiving the first unicast PDSCH scheduled through the first PDCCH includes: receiving the first unicast PDSCH scheduled through the first PDCCH when a group common PDSCH is received, wherein the HARQ process of the group common PDSCH is X and the NDI is Y.

[0086] In one implementation, after receiving the first unicast PDSCH scheduled by the first PDCCH, if the group common PDSCH decoding fails, the first unicast PDSCH and the group common PDSCH are merged and decoded.

[0087] In one implementation, if no group common PDSCH is received, a first unicast PDSCH scheduled through the first PDCCH is received; the HARQ process of the group common PDSCH is X, and the NDI is Y; the first unicast PDSCH is decoded.

[0088] In one implementation, after receiving the first unicast PDSCH scheduled via the first PDCCH, the method further includes: descrambling the first unicast PDSCH via G-RNTI; or descrambling the first unicast PDSCH via C-RNTI.

[0089] This terminal embodiment corresponds to the aforementioned terminal-side method embodiment. All implementation processes and methods of the aforementioned method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 8 A schematic diagram of the hardware structure of a terminal device to implement an embodiment of this application.

[0090] The terminal device 800 includes, but is not limited to, at least some of the following components: radio frequency unit 801, network module 802, audio output unit 803, input unit 804, sensor 805, display unit 806, user input unit 807, interface unit 808, memory 809, and processor 88.

[0091] Those skilled in the art will understand that the terminal device 800 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to the processor 810 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal device structure shown in the figure does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0092] It should be understood that, in this embodiment, the input unit 804 may include a graphics processing unit (GPU) 8041 and a microphone 8042. The GPU 8041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 806 may include a display panel 8061, which 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. The touch panel 8071 is also called a touch screen. The touch panel 8071 may include a touch detection device and a touch controller. Other input devices 8072 may include, but are not limited to, a physical keyboard, function keys (such as volume control buttons, power buttons, etc.), a trackball, a mouse, and a joystick, which will not be described in detail here.

[0093] In this embodiment, the radio frequency unit 801 receives downlink data from the network-side device and processes it for the processor 810; additionally, it sends uplink data to the network-side device. Typically, 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, etc.

[0094] The memory 809 can be used to store software programs or instructions and various data. The memory 809 may primarily include a program or instruction storage area and a data storage area. The program or instruction storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 809 may include high-speed random access memory and non-volatile memory, which may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0095] Processor 810 may include one or more processing units; optionally, processor 810 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications or instructions, and the modem processor mainly handles wireless communication, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 810.

[0096] The processor 810 is used for the terminal device to detect the first PDCCH; and when the first PDCCH is detected, to receive the first unicast PDSCH scheduled through the first PDCCH; wherein the cyclic redundancy check (CRC) of the first PDCCH is scrambled by the first G-RNTI.

[0097] In one implementation, the first PDCCH is sent in the USS.

[0098] In one implementation, receiving the first unicast PDSCH scheduled through the first PDCCH includes: upon receiving a group common PDSCH, receiving the first unicast PDSCH scheduled through the first PDCCH, 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.

[0099] In one implementation, after receiving the first unicast PDSCH scheduled by the first PDCCH, the method further includes: if the group common PDSCH decoding fails, then merging and decoding the first unicast PDSCH and the group common PDSCH.

[0100] In one implementation, receiving the first unicast PDSCH scheduled through the first PDCCH includes: receiving the first unicast PDSCH scheduled through the first PDCCH when no group common PDSCH is received; the HARQ process of the group common PDSCH is X, and the NDI is Y; and decoding the first unicast PDSCH.

[0101] In one implementation, after receiving the first unicast PDSCH scheduled by the first PDCCH, the first unicast PDSCH is descrambled by G-RNTI; or the first unicast PDSCH is descrambled by C-RNTI.

[0102] The terminal device 800 according to the embodiments of the present invention can refer to the process of the method 300 corresponding to the embodiments of the present invention. Furthermore, each unit / module in the terminal device 800 and the other operations and / or functions described above are respectively implemented to achieve the corresponding process in the method 300 and can achieve the same or equivalent technical effects. For the sake of brevity, they will not be described in detail here.

[0103] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described retransmission method embodiments for the common physical downlink shared channel and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0104] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0105] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above-described retransmission method embodiments for the common physical downlink shared channel, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0106] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0107] This application also provides a computer program product, which includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the method described in the first aspect.

[0108] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0109] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0110] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A retransmission method for a shared physical downlink channel, characterized in that, The method includes: The network device schedules the first unicast physical downlink shared channel PDSCH through the first physical downlink control channel PDCCH to retransmit the group common PDSCH scrambled with the first group of radio network temporary identifiers G-RNTI. The cyclic redundancy check (CRC) of the first PDCCH is scrambled with the first G-RNTI, and the first unicast PDSCH is scrambled with C-RNTI.

2. The method as described in claim 1, characterized in that, The Hybrid Automatic Repeat Request (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 Indicator (NDI) of the first unicast PDSCH is the same as the NDI of the group common PDSCH.

3. The method as described in claim 1 or 2, characterized in that, The first PDCCH is sent in the User Equipment Specific Search Space (USS).

4. A retransmission method for a shared physical downlink channel, characterized in that, The method includes: Terminal equipment detects the first PDCCH; If the first PDCCH is detected, a first unicast PDSCH scheduled through the first PDCCH is received; wherein, the first unicast PDSCH is used for retransmission of a group common PDSCH scrambled with a first group of radio network temporary identifiers (G-RNTI); the cyclic redundancy check (CRC) of the first PDCCH is scrambled with the first G-RNTI, and the first unicast PDSCH is scrambled with the C-RNTI.

5. The method as described in claim 4, characterized in that, The first PDCCH is sent in the USS.

6. The method as described in claim 4, characterized in that, The receiving of the first unicast PDSCH scheduled through the first PDCCH includes: Upon receiving a group common PDSCH, a first unicast PDSCH scheduled through 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.

7. The method as described in claim 6, characterized in that, After receiving the first unicast PDSCH scheduled via the first PDCCH, the method further includes: If the group common PDSCH decoding fails, the first unicast PDSCH and the group common PDSCH will be merged and decoded.

8. The method as described in claim 5, characterized in that, The receiving of the first unicast PDSCH scheduled through the first PDCCH includes: In the absence of a group common PDSCH, a first unicast PDSCH scheduled through 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. Decode the first unicast PDSCH.

9. The method according to any one of claims 4 to 8, characterized in that, After receiving the first unicast PDSCH scheduled via the first PDCCH, the method further includes: The first unicast PDSCH is descrambled using C-RNTI.

10. A retransmission device for a shared physical downlink channel, characterized in that, The device includes: The scheduling module is used to schedule the first unicast PDSCH through the first PDCCH to retransmit the group common PDSCH scrambled by the first G-RNTI, wherein the CRC of the first PDCCH is scrambled by the first G-RNTI, and the first unicast PDSCH is scrambled by the first C-RNTI.

11. The apparatus as claimed in claim 10, characterized in that, 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.

12. The apparatus as claimed in claim 10 or 11, characterized in that, The first PDCCH is sent in the USS.

13. A retransmission device for a shared physical downlink channel, characterized in that, The device includes: The detection module is used to detect the first PDCCH; The processing module is configured to receive a first unicast PDSCH scheduled through the first PDCCH when the first PDCCH is detected; wherein the first unicast PDSCH is used for retransmission of a group common PDSCH scrambled with a first group of radio network temporary identifiers (G-RNTI); the cyclic redundancy check (CRC) of the first PDCCH is scrambled with the first G-RNTI, and the first unicast PDSCH is scrambled with the C-RNTI.

14. The apparatus as claimed in claim 13, characterized in that, The first PDCCH is sent in the USS.

15. The apparatus as claimed in claim 13, characterized in that, The processing module is used for: Upon receiving a group common PDSCH, a first unicast PDSCH scheduled through 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.

16. The apparatus as claimed in claim 15, characterized in that, The processing module is configured to: after receiving the first unicast PDSCH scheduled through the first PDCCH, if the group common PDSCH decoding fails, merge and decode the first unicast PDSCH and the group common PDSCH.

17. The apparatus as claimed in claim 13, characterized in that, The processing module is used for: If no group common PDSCH is received, a first unicast PDSCH scheduled through 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; the first unicast PDSCH is decoded.

18. The apparatus as claimed in any one of claims 13 to 17, characterized in that, The processing module is further configured to: after receiving the first unicast PDSCH scheduled by the first PDCCH, descramble the first unicast PDSCH by C-RNTI.

19. A network device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the retransmission method for the group common physical downlink shared channel as described in any one of claims 1-3.

20. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the retransmission method for the group common physical downlink shared channel as described in any one of claims 4-9.

21. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the retransmission method for the group common physical downlink shared channel as described in any one of claims 1-3; or The steps of implementing the retransmission method for the group common physical downlink shared channel as described in any one of claims 4-9.

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