CN116261102A

CN116261102A - Communication method and device

Info

Publication number: CN116261102A
Application number: CN202111490093.7A
Authority: CN
Inventors: 张海森; 王燕; 李秉肇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2023-06-13
Also published as: WO2023104010A1

Abstract

The application provides a communication method and device for improving transmission efficiency of multicast data. The method comprises the following steps: acquiring first multicast data of a first service; and if the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, sending the first multicast data to the terminal equipment on resources except for resources used for synchronously transmitting the multicast data of the first service with other cells. By the method, the multicast data which is received but cannot be synchronously transmitted with other cells can be sent to the terminal equipment under the condition that the synchronous transmission of the multicast data between the cells is not affected.

Description

Communication method and device

Technical Field

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

Background

The multicast broadcast service (multicast and broadcast service, MBS) is a service for a plurality of terminal equipments, such as a live broadcast service, a public safety service, a batch software update service, etc. To support MBS data transmission, long term evolution LTE (long term evolution, LTE) systems support single frequency network (single frequency network, SFN) mechanisms. In the SFN mechanism, two or more cells of the same base station or different base stations operate on the same frequency and use the same time-frequency resource to transmit the same MBS data. Therefore, the terminal equipment can receive the synchronous MBS data sent by two or more cells, and the reliability of the MBS data is enhanced.

In the SFN mechanism, in order not to interfere with the synchronous transmission of MBS data, the base station may discard some of the transmissions of MBS data that have been received. For example, the base station 1 does not receive the data packet 3, so that the data packet 3 corresponds to the wireless transmission block 2, and the wireless transmission block 2 is different from the wireless transmission block 2 to be transmitted by the cells of other base stations, which causes interference to the cells of other base stations for synchronously transmitting the wireless transmission block 2, so that the base station 1 may discard the wireless transmission block 2, and the wireless transmission block 2 may include other data packets which are successfully received by the base station, besides the data packet 3, so that the data packets may also be discarded to be transmitted. For another example, the base station does not transmit the received data packet within a predetermined time, and the data packet which is not transmitted to the terminal device after exceeding the predetermined time is discarded.

According to the above mechanism, some multicast data, although successfully transmitted to the base station, cannot be transmitted to the terminal device, resulting in discarding the multicast data, thereby affecting the transmission efficiency of the multicast data.

Disclosure of Invention

The application provides a communication method and device for improving transmission efficiency of multicast data.

In a first aspect, the present application provides a communication method, where an execution body of the method may be a network device, or may be a system on a chip or a circuit, or an apparatus or a module in the network device, where the network device may be an access network device, or may be a Distributed Unit (DU) and/or a central unit (centrialized unit, CU) in the access network device. The method comprises the following steps: acquiring first multicast data of a first service; and if the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, the first multicast data is sent to the terminal equipment on a first resource, wherein the first resource is a resource except a second resource, and the second resource is used for synchronously transmitting the multicast data of the first service with other cells.

According to the method and the device for transmitting the multicast data of the first service, the multicast data which cannot be synchronously transmitted with other cells of the service are transmitted on resources except for the resources for synchronously transmitting the multicast data of the first service among the cells, so that the received multicast data which cannot be synchronously transmitted with other cells of the first service can be transmitted to the terminal equipment under the condition that the multicast data of the first service are not influenced by the synchronous transmission of the multicast data of the other cells, the defect of synchronous transmission of the multicast data at present can be overcome, the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and further the service experience of the first service can be improved.

In one possible design, the identity used for scrambling the first scheduling information is the same as the identity used for scrambling the second scheduling information, where the first scheduling information is used to indicate transmission of multicast data of the first service on the first resource, and the second scheduling information is used to indicate transmission of multicast data of the first service on the second resource in synchronization with other cells.

In the above manner, the first scheduling information and the second scheduling information are scrambled by adopting the same identifier, so that the terminal device can determine that the multicast data transmitted on the first resource and the multicast data transmitted on the second resource belong to the same service, which is beneficial to improving the data integrity of the first service.

In one possible design, the method further comprises: and sending first information to the terminal equipment, wherein the first information is used for indicating the first resource. By the design, the terminal equipment can receive multicast data from resources except the second resource.

In one possible design, the first information indicates a first search space for the terminal device to detect scheduling information of resources transmitting multicast data of the first service.

In one possible design, the first information may specifically indicate a duration of a first search space, where the duration of the first search space is greater than a duration of a search space corresponding to the second scheduling information.

In the above example, by adding the time domain resource of the first search space, the first search space may include the search space corresponding to the first scheduling information in addition to the search space corresponding to the second scheduling information, so that the terminal device may detect the first scheduling information in the indicated first search space, thereby may receive the multicast data on the first resource, and may further send the multicast data of the first service that has been received but cannot be synchronously transmitted with other cells to the terminal device without affecting the multicast data of the first service that is synchronously transmitted with other cells, so as to improve the transmission efficiency of the multicast data of the first service, improve the data integrity of the first service, and improve the service experience of the first service.

In one possible design, the first information may indicate a third search space. The third search space is used for detecting the first scheduling information by the terminal equipment.

According to the design, the third search space is indicated, so that the terminal equipment can detect the first scheduling information in the third search space, multicast data can be received on the first resource, and then the received multicast data which cannot be synchronously transmitted with other cells in the first service can be sent to the terminal equipment under the condition that the multicast data of the first service is not influenced by synchronous transmission of the multicast data of the first service in other cells, so that the transmission efficiency of the multicast data of the first service is improved, the data integrity of the first service is improved, and the service experience of the first service is improved.

In one possible design, the first information is downlink control information (downlink control information, DCI) carried in the second resource, and the first information indicates the first resource. According to the design, the DCI carried by the second resource indicates resources beyond the second resource, so that the terminal equipment can receive multicast data on the resources beyond the second resource, and therefore the received multicast data which cannot be synchronously transmitted with other cells in the first service can be sent to the terminal equipment under the condition that the multicast data of the first service are not influenced by synchronous transmission of the multicast data of the first service in other cells, so that the transmission efficiency of the multicast data of the first service is improved, the data integrity of the first service is improved, and the service experience of the first service is improved.

In one possible design, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cell includes: and determining that the second multicast data is lost, wherein the first multicast data corresponds to the same wireless transmission block as the second multicast data.

Because the second multicast data and the first multicast data correspond to the same wireless transmission block, if the second multicast data is lost, the data in the wireless transmission block is incomplete, and the wireless transmission block cannot synchronously transmit with the wireless transmission blocks of other cells, so that the first multicast data cannot synchronously transmit with the first multicast data of other cells. In the implementation manner, the first multicast data is sent to the terminal device on the resources other than the second resources, so that the first multicast data can be transmitted to the terminal device under the condition that synchronous transmission of other cells is not affected, transmission efficiency of the multicast data of the first service can be improved, data integrity of the first service can be improved, and service experience of the first service can be improved.

In one possible design, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cell includes: after receiving the first time information, receiving second time information, wherein the first time information indicates the sending time of the first multicast data, the second time information indicates the sending time of the third multicast data, and the first multicast data and the third multicast data belong to the same multicast service; and determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells according to the second time information.

By the method, the first multicast data which is not transmitted in the multicast data associated with the first time information can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data associated with the second time information is not affected, so that the performance of synchronous transmission can be improved.

In one possible design, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cell includes: and determining that the acquisition time of the first multicast data is later than a first time or a second time, wherein the first time is the time for transmitting the first multicast data to the terminal equipment, the second time is positioned before the first time, and the second time is separated from the first time by a preset time length.

By the method, the first multicast data which is received late can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data of other cells is not influenced, so that the synchronous transmission performance can be improved.

In one possible design, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cell includes: according to the information carried by the packet header of the first multicast data, the sending condition of the multicast data before the first multicast data cannot be determined, so that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells.

In the implementation manner, the multicast data which cannot be synchronously transmitted with other cells are transmitted on the resources except the second resources, so that the first multicast data can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data of other cells is not affected, the transmission efficiency of the multicast data of the first service is improved, the data integrity of the first service is improved, and the service experience of the first service is improved.

In a second aspect, the application provides a communication method, where the main implementation body of the method may be a network device, or may be a chip or a circuit, or an apparatus or a module in the network device, where the network device may be an access network device, or may be a DU and/or a CU in the access network device. The method comprises the following steps: acquiring first multicast data of a first service; transmitting scheduling information, wherein the scheduling information is used for indicating resources for transmitting first multicast data, if the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, the scheduling information adopts a first identifier to scramble, and if the first multicast data can be synchronously transmitted with the first multicast data of other cells, the scheduling information adopts a second identifier to scramble; and transmitting the first multicast data on the resources indicated by the scheduling information.

In the embodiment of the invention, the multicast data which can be synchronized with other cells and the multicast data which cannot be synchronized with other cells are distinguished through different identifiers, so that the network equipment can send the received multicast data which cannot be synchronized with other cells to the terminal equipment under the condition of avoiding affecting the synchronous transmission of the multicast data of other cells, thereby overcoming the defect of the synchronous transmission of the multicast data at present, improving the transmission efficiency of the multicast data of the first service, improving the data integrity of the first service, and further improving the service experience of the first service. In addition, in the embodiment of the present application, the resource that transmits the multicast data that cannot be synchronously transmitted with other cells is still the resource that should be synchronously transmitted, and compared with the resource that transmits the multicast data that cannot be synchronously transmitted with other cells through other resources, the resource utilization rate can be improved, and the complexity of resource configuration can be reduced.

In one possible design, the first identifier is at the cell level, or the first identifier is at the access network device level. The design distinguishes the multicast data which cannot be synchronously transmitted with other cells through the cell-level or access network equipment-level identification, so that the influence on the synchronous transmission of the multicast data of other cells can be avoided.

In one possible design, the second identifier is an identifier for semi-static scheduling.

In one possible design, the method further comprises: if the second multicast data is lost, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells; wherein the first multicast data corresponds to the same wireless transport block as the second multicast data.

Because the second multicast data and the first multicast data correspond to the same wireless transmission block, if the second multicast data is lost, the data in the wireless transmission block is incomplete, and the wireless transmission block cannot synchronously transmit with the wireless transmission blocks of other cells, so that the first multicast data cannot synchronously transmit with the first multicast data of other cells. In the above implementation manner, the first multicast data is sent to the terminal device on the resources other than the second resources for synchronously transmitting the multicast data with other cells, so that the first multicast data can be transmitted to the terminal device without affecting the synchronous transmission of other cells, thereby improving the transmission efficiency of the multicast data of the first service, improving the data integrity of the first service, and further improving the service experience of the first service.

In one possible design, the method further comprises: if the acquisition time of the first multicast data is later than the first time or the second time, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells; the first time is a time for transmitting the first multicast data to the terminal device, the second time is located before the first time, and the second time is spaced from the first time by a predetermined time length.

By the method, the first multicast data which is received late can be transmitted to the terminal equipment under the condition that the multicast data of other cells are not influenced, so that the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and the service experience of the first service can be improved.

In the above implementation manner, the multicast data whose transmission time cannot be determined is transmitted on the resources other than the second resources for synchronously transmitting the multicast data with other cells, so that the first multicast data can be transmitted to the terminal device without affecting the synchronous transmission of the multicast data with other cells, thereby improving the transmission efficiency of the multicast data of the first service, improving the data integrity of the first service, and improving the service experience of the first service.

In a third aspect, the present application provides a communication method, where the execution body of the method may be a terminal device, or may be a chip or a circuit, or an apparatus or a module in the terminal device. The method comprises the following steps: descrambling scheduling information by adopting a first identifier and a second identifier, wherein the first identifier is used for descrambling scheduling information of resources which cannot synchronously transmit multicast data with other cells, and the second identifier is used for descrambling scheduling information of resources which can synchronously transmit multicast data with other cells; multicast data is received according to the scheduling information.

According to the embodiment of the invention, the multicast data which can be synchronized with other cells and the multicast data which cannot be synchronized with other cells are distinguished through different identifications, so that the network equipment can send the received multicast data which cannot be synchronized with other cells to the terminal equipment under the condition of reducing the influence of the multicast data which cannot be synchronized with other cells on a multicast data synchronous transmission mechanism, thereby overcoming the defect of synchronous transmission of the current multicast data, improving the transmission efficiency of the multicast data of the first service, improving the data integrity of the first service, and further improving the service experience of the first service. In addition, in the embodiment of the present application, the resource that transmits the multicast data that cannot be synchronously transmitted with other cells is still the resource that should be synchronously transmitted, and compared with the resource that transmits the multicast data that cannot be synchronously transmitted with other cells through other resources, the resource utilization rate can be improved, and the complexity of resource configuration can be reduced.

In a fourth aspect, the present application provides a communication method, where the main execution body of the method may be a network device, or may be a chip or a circuit, or an apparatus or a module in the network device, where the network device may be an access network device, or may be a DU and/or a CU in the access network device. The method comprises the following steps: transmitting first configuration information to the terminal equipment, wherein the first configuration information comprises configuration information carried by a first radio link control (radio link control, RLC) and configuration information carried by a second RLC, the first RLC is used for point-to-point transmission, and the second RLC is used for point-to-multipoint transmission; acquiring first multicast data; determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells; the first multicast data is transmitted over a first RLC bearer.

According to the embodiment of the application, the multicast data which cannot be synchronously transmitted with other cells is transmitted to the terminal equipment in a point-to-point transmission mode, so that the received multicast data which cannot be synchronously transmitted with other cells can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data of other cells is not affected, the defect of synchronous transmission of the current multicast data can be overcome, the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and the service experience of the first service can be improved.

In one possible design, the first configuration information further includes an identifier of a first multicast radio bearer and an identifier of a second multicast radio bearer, where the RLC bearer corresponding to the first multicast radio bearer includes the first RLC bearer, and the RLC bearer corresponding to the second multicast radio bearer includes the second RLC bearer.

In one possible design, the first configuration information further includes an identification of a first multicast radio bearer, where the RLC bearer corresponding to the first multicast radio bearer includes a first RLC bearer.

In one possible design, the first configuration information further includes an identifier of a third multicast radio bearer, where the RCL bearer corresponding to the third multicast radio bearer includes a first RLC bearer and a second RLC bearer.

In one possible design, the first configuration information further includes an identifier of a fourth multicast radio bearer and an identifier of a first data radio bearer, where an RLC bearer corresponding to the fourth multicast radio bearer includes a second RLC bearer, and an RLC bearer corresponding to the first data radio bearer includes a first RLC bearer.

In one possible design, the first configuration information further includes an identification of a first data radio bearer, where the RLC bearer corresponding to the first data radio bearer includes the first RLC bearer.

By the method, the first multicast data which is not transmitted in the multicast data associated with the first time information can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data associated with the second time information is not affected, so that the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and the service experience of the first service can be improved.

In the implementation manner, the multicast data whose transmission time cannot be determined is transmitted on the resources other than the second resource, so that the first multicast data can be transmitted to the terminal device without affecting synchronous transmission of the multicast data in other cells, thereby improving the transmission efficiency of the multicast data of the first service, improving the data integrity of the first service, and improving the service experience of the first service.

In a fifth aspect, the present application provides a communication method, where the execution body of the method may be a terminal device, or may be a chip or a circuit, or an apparatus or a module in the terminal device. The method comprises the following steps: receiving first configuration information, wherein the first configuration information comprises configuration information of a first RLC bearer and configuration information of a second RLC bearer, the first RLC bearer is used for point-to-point transmission, and the second RLC bearer is used for point-to-multipoint transmission; multicast data is received over the first RLC bearer and the second RLC bearer.

In one possible design, the first configuration information further includes an identifier of a first multicast radio bearer and an identifier of a second multicast radio bearer, where an RLC entity corresponding to the first multicast radio bearer includes the first RLC bearer, and an RLC bearer corresponding to the second multicast radio bearer includes the second RLC bearer.

In a sixth aspect, embodiments of the present application provide a communications apparatus, where the method implemented by the network device in the first aspect, the second aspect, the fourth aspect, or any possible design thereof may be implemented. The apparatus comprises corresponding units or means for performing the above-described methods. The units comprised by the device may be implemented in software and/or hardware. The apparatus may be, for example, a network device, or a component or baseband chip, a system-on-chip, or a processor, etc. that may support implementation of the above method in a network device.

The communication device may comprise modular components such as a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), which may perform the corresponding functions of the network device, or the system-on-chip or the circuit, or the apparatus or module in the network device in the above-mentioned first aspect or second aspect or fourth aspect or any of its possible designs, for example. When the communication apparatus is a network device, the transceiver unit may be a transmitter and a receiver, or a transceiver obtained by integrating the transmitter and the receiver. The transceiver unit may include an antenna, a radio frequency circuit, etc., and the processing unit may be a processor, such as a baseband chip, etc. When the communication device is a component having the above-mentioned network equipment function, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiver unit may be an input/output interface of the chip system, and the processing unit may be a processor of the chip system, for example: a central processing unit (central processing unit, CPU).

The transceiver unit may be adapted to perform the actions of receiving and/or transmitting performed by the network device in the first aspect or the second aspect or the fourth aspect or any possible designs thereof. The processing unit may be operative to perform actions other than the receiving and transmitting performed by the network device in the first aspect or the second aspect or the fourth aspect or any possible designs thereof. E.g., acquiring first multicast data, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, etc.

In a seventh aspect, embodiments of the present application provide a communications apparatus, where the method implemented by the terminal device in the third aspect or the fifth aspect or any possible design thereof may be implemented. The apparatus comprises corresponding units or means for performing the above-described methods. The units comprised by the device may be implemented in software and/or hardware. The apparatus may be, for example, a terminal device, or a component or baseband chip, a system-on-chip, a processor, or the like that may support implementation of the above method in a terminal device.

The communication device may comprise modular components such as a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), which may perform the corresponding functions of the terminal device in the third or fifth aspect or any of its possible designs. When the communication apparatus is a terminal device, the transceiver unit may be a transmitter and a receiver, or a transceiver obtained by integrating the transmitter and the receiver. The transceiver unit may include an antenna, a radio frequency circuit, etc., and the processing unit may be a processor, such as a baseband chip, etc. When the communication device is a component having the above-mentioned terminal equipment function, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiver unit may be an input/output interface of the chip system, and the processing unit may be a processor of the chip system, for example: and a CPU.

The transceiving unit may be operable to perform the actions of receiving and/or transmitting performed by the terminal device in the third or fifth aspect or any possible design thereof. The processing unit may be operative to perform actions other than the receiving and transmitting performed by the terminal device in the third or fifth aspect or any possible design thereof. Such as detecting scheduling information using the first identifier and the second identifier.

In an eighth aspect, a communication system is provided, comprising a communication device and a terminal device performing the method as shown in the first aspect or any one of its possible designs.

A ninth aspect provides a communication system comprising communication means for performing the method as shown in the second aspect or any one of its possible designs and communication means for performing the method as shown in the third aspect or any one of its possible designs.

In a tenth aspect, there is provided a communication system comprising a communication device performing the method shown in the fourth aspect or any one of its possible designs and a communication device performing the method shown in the fifth aspect or any one of its possible designs.

In an eleventh aspect, there is provided a computer readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the method shown in the first to fifth aspects or any one of their possible designs.

In a twelfth aspect, there is provided a computer program product containing instructions for storing computer instructions which, when run on a computer, cause the computer to perform the method shown in the first to fifth aspects or any one of their possible designs.

In a thirteenth aspect, there is provided a circuit coupled to a memory, the circuit being adapted to perform the method shown in the first to fifth aspects or any one of its possible designs. The circuitry may include chip circuitry.

Drawings

Fig. 1 is a schematic diagram of MBS data transmission according to an embodiment of the present application;

fig. 2A is a schematic diagram of a multicast radio bearer according to an embodiment of the present application;

fig. 2B is a schematic diagram of another multicast radio bearer according to an embodiment of the present application;

fig. 3 is a schematic diagram of a wireless transport block being silenced according to an embodiment of the present application;

fig. 4 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

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

Fig. 8 is a flow chart of a communication method according to an embodiment of the present application;

fig. 9 is a schematic diagram of a search space corresponding to second scheduling information in an embodiment of the present application;

FIG. 10 is a schematic diagram of a first search space according to an embodiment of the present application;

FIG. 11 is a flow chart of a communication method according to an embodiment of the present application;

FIG. 12 is a schematic diagram of scheduling resource scrambling according to an embodiment of the present application;

fig. 13 is a flow chart of a communication method according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings. The specific method of operation in the method embodiment may also be applied to the device embodiment or the system embodiment.

In the following, some terms in the embodiments of the present application are explained for easy understanding by those skilled in the art.

1) MBS: MBS is a service that is simultaneously transmitted to a plurality of terminal devices, for example, a live broadcast service, a public security service, a batch software update service, etc. MBS is an acronym for multicast/broadcast or multicast/broadcast services. The MBS comes from a data server, firstly the data server sends the data of the MBS to core network equipment, then the core network equipment sends the data of the MBS to access network equipment, and finally the access network equipment sends the data of the MBS to at least one terminal equipment for receiving the MBS. When the core network device sends the data of the MBS to the access network device, the data of the MBS is transmitted through a common transmission channel, namely MBS session, and when the access network device sends the data to the terminal device, two transmission modes exist: the first method may adopt a point-to-multipoint (PTM) transmission mode; the second type may employ a point-to-point (PTP) transmission scheme. As shown in fig. 1.

In the embodiment of the present application, MBS may also be referred to as "MBS service", "MBS broadcast service", "MBS session", "MBS broadcast service", "MBS multicast service", "broadcast service", "multicast service", "MBS service", and so on.

It should be noted that MBS is only an exemplary naming of the multicast service, and the naming of the multicast service may be different under different communication schemes, for example, the multicast service may be called as a multimedia broadcast multicast service (multimedia broadcast multicast service, MBMS) in long term evolution (long term evolution, LTE), the multicast service may be called as an MBS in new air radio, NR), and the multicast service may be named as other in future communication development, which is not particularly limited in this application, and hereinafter collectively called as a multicast service.

2) The single frequency network (single frequency network, SFN) mechanism refers to: and a plurality of cells synchronized with each other in a certain area transmit the same data to the terminal equipment on the same time frequency resource at the same time, the same physical signals transmitted by the cells are overlapped on an air interface, and the terminal equipment looks to receive single overlapped data, so that the strength of the received signals can be improved, and meanwhile, the interference among the cells is eliminated. The mechanism requires that the data transmitted by two or more cells, which may belong to the same base station or to different base stations, be identical, otherwise the transmitted signals cannot be correctly combined.

In the current MBSFN technology, i.e. the SFN mechanism of the MBS, N cells use the same time-frequency resource when transmitting MBS data, and the N cells transmit the same MBS data on the same time-frequency resource, i.e. the N cells all transmit data packet 0 on resource 0, and transmit data packet 1 on resource 1, N is an integer greater than 1, and the N cells belong to the same base station or to different base stations. Thus, the MBS data transmitted by a plurality of cells is as if one cell is transmitting MBS data. If a certain UE is at the edge covered by a certain cell, the UE may receive signals of the current cell and the neighboring cell, and because MBS data is sent on the same time-frequency resource, the UE may receive superimposed MBS data signals sent by two or more cells, thereby enhancing the reliability of MBS data transmission.

In order to ensure that the same MBS data is transmitted on the same resource, a control device (or referred to as a transmission control device) of the MBS data, such as a core network device, an access network device, a CU of the access network device, or an application server of the MBS, may carry a time tag in the MBS data, where the time tag may indicate a time of transmitting the MBS data (or the group of MBS data), so as to ensure synchronization of MBS data transmission between a plurality of cells.

3) Multicast Radio Bearer (MRB): currently, when a base station performs multicast transmission, a data packet in a packet data convergence layer protocol (packet data convergence protocol, PDCP) entity is transmitted to a medium access control (media access control, MAC) entity through one RLC entity, and then the data packet is sent out through a physical layer, and a plurality of terminal devices receive the data packet. If a PTM transmission mode is adopted, the data packet is sent to the terminal device through a PTM path or a PTM branch or a PTM leg (leg) or an entity for PTM transmission. If a PTP transmission mode is adopted, the data packet is sent to the terminal device through a PTP path or PTP branch or PTP leg (leg) or an entity for PTP transmission. Where paths, branches, legs, or entities are schematically depicted transmission paths of corresponding transmission means, the present application is not limited.

In one implementation, a base station may configure a split-MRB (split-MRB) for a terminal device, i.e., the MRB configured by the base station for the terminal device may include at least two paths. For example, as shown in fig. 2A, MRB1 may be configured for a terminal device. MRB1 may include one PDCP entity, which may connect RLC1 entity and RLC2 entity, RLC1 entity may correspond to PTP path, and RLC2 entity may correspond to PTM path.

In another implementation, the MRB configured by the base station for the terminal device may include 1 path, which may be a PTP path or a PTM path. For example, as shown in fig. 2B, the base station may configure MRB2 for the terminal device. MRB2 may include a PDCP entity, which may be connected to an RLC entity, which may correspond to a PTP path or a PTM path.

It should be noted that fig. 2A and fig. 2B are only exemplary illustrations, and do not limit the protocol architecture of the terminal device.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

And, unless otherwise indicated, the terms "first," "second," and the like in the embodiments herein are used for distinguishing between multiple objects and are not used for limiting the size, content, order, timing, priority, importance, or the like of the multiple objects. For example, the first information and the second information are only for distinguishing different information, and are not indicative of the difference in size, content, priority, importance, or the like of the two pieces of information.

The foregoing presents some concepts related to the embodiments of the present application, and the following presents technical features related to the embodiments of the present application.

Currently, in the SFN mechanism, if the base station does not receive multicast data from the core network device (or the DU of the base station does not receive multicast data from the CU of the base station), the data in the radio transmission block corresponding to the multicast data is incomplete, if the radio transmission block is still transmitted on the SFN resource through the PTM, the multicast data content sent on the SFN resource by the cell of the other base station (or other DU of the base station) is inconsistent, so that interference is caused to the synchronous transmission of the radio transmission block by the cell of the other base station (or other DU of the base station), and SFN cannot be implemented. Therefore, the corresponding radio transport block for the missing multicast data should be muted (muted), i.e., not transmitted. The radio transport block may include other multicast data in addition to the lost multicast data, and the radio transport block is muted, so that the other multicast data included in the radio transport block cannot be transmitted. For example, taking multicast data that is not received by a DU of a base station from a CU of the base station as shown in fig. 3, a DU of the base station does not receive PDCP protocol data unit (protocol data unit, PDU) 2 from the CU of the base station, the PDCP PDU 2 should be transmitted with one segment of PDCP PDU 1 and PDCP PDU 3 encapsulation in radio transport block 1, and the radio transport block 1 is muted due to loss of PDCP PDU 2, so that other multicast data that should be included in the radio transport block 1 cannot be simultaneously transmitted with those of cells of other DUs.

Furthermore, according to the foregoing term introduction 2), the multicast data received by the base station carries a time stamp, and the time stamp may indicate the time when the base station transmitted the multicast data on the air interface. If the multicast data associated with the time tag is not transmitted before the transmission time indicated by the next time tag because the data size is large, so as not to affect the synchronous transmission of the multicast data of the next time tag, the multicast data which is not transmitted should be discarded, and the multicast data which is not transmitted is not successfully received by the base station but cannot be synchronously transmitted with the multicast data of the cells of other base stations.

According to the above mechanism, some multicast data, although successfully transmitted to the base station, cannot be transmitted to the terminal device, resulting in discarding the data packets, thereby affecting transmission efficiency.

Based on this, the embodiment of the application provides a communication method and device, which are used for improving the transmission efficiency of multicast data. The method and the device are based on the same technical conception, and because the principle of solving the problems by the method and the device is similar, the implementation of the device and the method can be mutually referred to, and the repeated parts are not repeated.

The communication method provided by the application can be applied to various communication systems, for example, the communication method can be the Internet of things (internet of things, ioT), the narrowband Internet of things (narrow band internet of things, NB-IoT), the long term evolution (long term evolution, LTE) or the fifth generation (5) ^th generation, 5G) communication system, may be a LTE and 5G hybrid architecture, or may be a new communication system that appears in 6G or future communication development, etc. The 5G communication system described herein may include at least one of a non-independent Networking (NSA) 5G communication system and an independent networking (SA) 5G communication system. The communication system may also be a machine-to-machine (machine-to-machine)hine, M2M) communication, machine-type communication (machine type communication, MTC), vehicle-to-vehicle communication, or vehicle-to-node communication or other communication system.

As shown in fig. 4, the communication method provided in the embodiment of the present application may be applied to a communication system, where the communication system includes a terminal device and a plurality of access network devices, and may further include a core network device. Fig. 4 exemplifies 3 access network devices, namely access network device 1, access network device 2 and access network device 3. The plurality of access network devices simultaneously transmit the same multicast data to the terminal device on the same time-frequency resource.

The embodiments of the present application may also be used in other communication systems, as long as multiple cell/access network devices need to perform multicast data synchronous transmission in the communication system. Fig. 4 is merely a schematic view, and the type of the communication system, and the number, type, and the like of devices included in the communication system are not particularly limited.

The terminal devices shown above may be User Equipment (UE), terminals (terminal), access terminals, terminal units, terminal stations, mobile Stations (MS), remote stations, remote terminals, mobile terminals (mobile terminal), wireless communication devices, terminal agents, terminal devices, cellular phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital processing (personal digital assistant, PDA) devices, handheld devices with wireless communication functionality, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in future 5G networks or terminal devices in future evolved PLMN networks, etc. The terminal device may be provided with a radio transceiver function capable of communicating (e.g., radio) with one or more access network devices of one or more communication systems and receiving network services provided by the access network devices, including but not limited to the access network device shown in fig. 4.

In addition, the terminal device may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the terminal equipment can also be deployed on the water surface (such as a ship and the like); the terminal device may also be deployed in the air (e.g., on an aircraft, balloon, satellite, etc.). The terminal device may specifically be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or the like. The terminal device may be a communication chip having a communication module, a vehicle having a communication function, or an in-vehicle device (e.g., an in-vehicle communication apparatus, an in-vehicle communication chip), or the like.

The access network device (or access network station refers to a device that provides network access functions, such as a radio access network (radio access network, RAN) base station (or RAN device)), and the like, the access network device may specifically include a Base Station (BS), or include a base station and a radio resource management device for controlling the base station, and the like.

For example, access network devices include, but are not limited to: the next generation base station (G nodeB, gNB) in 5G, evolved nodeB (eNB) in long term evolution (long term evolution, LTE) system, radio network controller (radio network controller, RNC), radio controller under cloud radio access network (cloud radio access network, CRAN) system, base station controller (base station controller, BSC), home base station (e.g., home evolved nodeB, or home node B, HNB), baseBand unit (BBU), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), mobile switching center, also may be evolved NB (eNB or eNodeB) in LTE, also may be base station equipment in 5G network or access network equipment in future evolved PLMN network, also may be wearable equipment or vehicle-mounted equipment.

In some deployments, the access network device may include a Centralized Unit (CU) and DUs. The access network device may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functions of the access network device, the DU implements part of the functions of the access network device, e.g. the CU is responsible for handling non-real time protocols and services, implementing radio resource control (radio resource control, RRC), the PDCP layer functions. The DU is responsible for handling physical layer protocols and real-time services, and implements functions of an RLC layer, a MAC layer, and a physical layer (PHY) layer. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the access network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into access network devices in an access network (radio access network, RAN), or may be divided into access network devices (may be referred to as CN devices) in a Core Network (CN), which is not limited in this application.

Furthermore, the access network device may be connected to a Core Network (CN) device, which may be used to provide core network services for terminal devices accessing the access network. The core network device may correspond to different devices under different systems. The core network device may correspond to a serving support node (serving GPRS support node, SGSN) of a general packet radio service technology (general packet radio service, GPRS) and/or a gateway support node (gateway GPRS Support Node, GGSN) of GPRS, for example in 3G. In 4G the core network device may correspond to a mobility management entity (mobility management entity, MME) and/or a serving gateway (S-GW), etc. The core network device may correspond to an access and mobility management function (access and mobility management function, AMF) entity, a session management function (session management function, SMF) entity, or a user plane function (user plane function, UPF) entity, etc. in 5G.

Possible configurations of the access network device and the terminal device are described below with reference to the accompanying drawings.

By way of example, fig. 5 shows a schematic diagram of one possible construction of the device. The apparatus shown in fig. 5 may be a communication device, or may be a chip applied to the communication device or other combination devices, components (or called modules) having functions of the communication device shown in the application, where the communication device may be a network device, such as a first network device shown in an embodiment of the application, or may also be a terminal device. The apparatus may include a processing module 510 and a transceiver module 520. Wherein the transceiver module 520 may be a functional module that can perform both a transmitting operation and a receiving operation, e.g., the transceiver module 520 may be used to perform all transmitting and receiving operations performed by the communication device, e.g., when performing a transmitting operation, the transceiver module 520 may be considered a transmitting module and when performing a receiving operation, the transceiver module 520 may be considered a receiving module; alternatively, the transceiver module 520 may be two functional modules, where the transceiver module 520 may be regarded as a generic term of the two functional modules, and the two functional modules are a transmitting module and a receiving module, respectively, where the transmitting module is used to perform a transmitting operation, for example, the transmitting module may be used to perform all transmitting operations performed by the communication device, and the receiving module is used to perform all receiving operations performed by the communication device.

For example, when the apparatus is a communication device, the transceiver module 520 may include a transceiver and/or a communication interface. The transceiver may include an antenna, radio frequency circuitry, and the like. A communication interface such as a fiber optic interface. The processing module 510 may be a processor, such as a baseband processor, which may include one or more central processing units (central processing unit, CPU) therein.

When the apparatus is a component having the function of the communication device as shown in the present application, the transceiver module 520 may be a radio frequency unit, and the processing module 510 may be a processor, for example, a baseband processor.

When the device is a system-on-chip, the transceiver module 520 may be an input-output interface of a chip (e.g., a baseband chip), and the processing module 510 may be a processor of the system-on-chip, and may include one or more central processing units.

It should be appreciated that the processing module 510 in embodiments of the present application may be implemented by a processor or processor-related circuit component, and the transceiver module 520 may be implemented by a transceiver or transceiver-related circuit component.

In one implementation, when the communication device is a network device, the processing module 510 may be configured to perform all operations performed by the first network device in the embodiments of the present application, such as processing operations, and/or other procedures for supporting the techniques described herein, such as determining that the first multicast data cannot be transmitted synchronously with the first multicast data of other cells, scrambling scheduling information, and so on. The transceiver module 520 may be used to perform all of the receiving and transmitting operations performed by the first network device in embodiments of the present application, and/or to support other processes of the techniques described herein.

It will be appreciated that the transceiver module is also referred to as a transceiver unit. When the apparatus shown in fig. 5 is a terminal device, the transceiver module 520 may be specifically the transceiver 610 in fig. 6, and the processing module 510 may be specifically the processor 620 in fig. 6. When the apparatus shown in fig. 5 is a network device, the transceiver module 520 may be specifically the transceiver 710 in fig. 7, and the processing module 510 may be specifically the processor 720 in fig. 7.

In another implementation, when the communication device is a terminal device, the processing module 510 may be configured to perform all operations performed by the terminal device in the embodiments of the present application, such as processing operations, and/or other procedures for supporting the techniques described herein, such as receiving, by the transceiver module 520, the first multicast data on the first resource, descrambling the scheduling information with the first identifier and the second identifier, and so on. Transceiver module 520 may be used to perform all of the receiving and transmitting operations performed by the terminal device in embodiments of the present application, and/or to support other processes of the techniques described herein.

Fig. 6 shows another possible structural schematic of the terminal device. As shown in fig. 6, the terminal device includes a processor 620 and a transceiver 610, and may also include one or more of a memory and input-output devices. The processor 620 is mainly used for processing communication protocols and communication data, controlling the device, executing software programs, processing data of the software programs, and the like. The memory is mainly used for storing software programs and data. The transceiver 610 is used to perform functions related to data transmission and reception. The transceiver 610 may include a radio frequency unit (or radio frequency circuit), an antenna, among others. The radio frequency unit is mainly used for converting the baseband signal and the radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user. It should be noted that some kinds of terminal apparatuses may not have an input/output device.

When the terminal device needs to transmit data, the processor 620 performs baseband processing on the data to be transmitted, and outputs a baseband signal to the radio frequency circuit of the transceiver 610, and the radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal device, the radio frequency circuit of the transceiver 610 receives a radio frequency signal through an antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 620, and the processor 620 converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor is shown in fig. 6. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, which is not limited by the embodiments of the present application.

Fig. 7 shows another possible architecture diagram of a network device. As shown in fig. 7, the network device includes a processor 720 and a transceiver 710, alternatively, the transceiver 710 may also be referred to as a transceiver, transceiver circuitry, or the like. The network device may also include one or more of a memory and an input-output device.

The processor 720 is mainly configured to process a communication protocol and communication data, perform baseband processing, control a network device, execute a software program, process data of the software program, and the like. The memory is mainly used for storing software programs and data. The transceiver 710 is used to perform functions related to data transmission and reception. Wherein the transceiver 710 may include at least one antenna 711 and a radio frequency unit 712. The transceiver 710 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals into baseband signals. The radio frequency unit is mainly used for converting the baseband signal and the radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves.

The transceiver 710 and the processor 720 may be physically located together or may be physically separate, i.e., a distributed access network device.

Illustratively, the transceiver 710 may include one or more radio frequency units, such as a remote radio frequency unit (remote radio unit, RRU), and the processor 720 may include one or more baseband units (BBUs) (also referred to as digital units, DUs).

In one example, the processor 720 may be configured by one or more single boards, where the multiple single boards may support a single access system radio access network (such as an LTE network), or may support different access systems radio access networks (such as an LTE network, a 5G network, or other networks). The processor 720 further comprises a memory unit 721 and a processing unit 722. The memory unit 721 is configured to store necessary instructions and data. The processing unit 722 is configured to control the network device to perform necessary actions, for example, to control the network device to execute the operation procedure related to the first network device in the embodiment shown in the present application. The memory unit 721 and the processing unit 722 may serve one or more boards. That is, the storage unit and the processing unit may be separately provided on each board. It is also possible that multiple veneers share the same memory unit and processing unit. In addition, each single board can be provided with necessary circuits.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided in the embodiments of the present application is applicable to similar technical problems.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. For ease of description, the method is hereinafter performed by a network device and a terminal device as an example, where the network device may be an access network device, or may be a DU and/or a CU in the access network device. The method can be applied to a multicast data synchronous transmission scene, such as an SFN scene, in which a plurality of network devices can cooperatively transmit data to terminal devices. For the sake of facilitating understanding of the scheme, the following description is made with respect to a communication flow between one network device participating in multicast transmission (hereinafter referred to as a first network device) and a terminal device in a multicast scenario, and it should be understood that a process of communicating with other network devices and terminal devices that cooperate with the first network device to perform multicast data synchronous transmission may refer to a flow of communicating with the terminal device by the first network device.

It should be noted that, the embodiments of the present application only take multicast data as an example for illustration, and it should be understood that the schemes provided in the embodiments of the present application may also be applied to synchronous transmission scenarios of unicast data or other data. In addition, in the method according to the embodiment of the present application, the related actions of the network device, the actions of the access network device, the actions of the base station, and the actions of the cell are expressed in the same meaning unless otherwise specified. For example, in S801 below, the first network device may acquire the first multicast data of the first service, or may be expressed as that the first access network device acquires the first multicast data of the first service, or expressed as that the first cell acquires the first multicast data of the first service, or the like. And will not be described in detail below.

It should also be understood that the embodiments of the present application may be implemented alone or in combination with one another.

Referring to fig. 8, a flow chart of a communication method provided in the present application is shown. The method comprises the following steps:

s801, the first network device acquires first multicast data of a first service.

Optionally, the first network device may obtain the first multicast data through a generation manner, or may obtain the first multicast data through an upper node, or may obtain the first multicast data through other manners, which is not limited herein specifically. The first network device may be an access network device or a CU of the access network device, and the upper node may be a core network device, or may be a host node, a relay node, or the like. Alternatively, the first network device may be a DU in the access network device, and the upper node may be a CU in the access network device.

In one exemplary illustration, the first network device may also obtain first time information from an upper node, wherein the first time information may indicate a time of transmission of the first multicast data. Wherein the time information may also be referred to as a time stamp, etc.

Alternatively, the first multicast data may be a data packet, for example, the first multicast data may be a PDCP PDU, or may be an RLC service data unit (service data unit, SDU), or may be a Synchronization (SYNC) PDU, or may be a new air interface user plane (NR-U) PDU, or may be a general packet radio service tunneling protocol user plane (GPRS tunnel protocol user, GTP-U) PDU. Wherein, NR-U PDU can also be called NR-U packet (NR-U packet)

In one example, in a scenario where the first network device is a DU of the access network device and the upper node of the first network device is a CU of the access network device, the first multicast data may be a PDCP PDU, or an RLC SDU, or a SYNC PDU, or an NR-U PDU, or a GTP-U PDU.

In another example, in a scenario where the first network device is an access network device or a CU of the access network device, and a higher node of the first network device is a core network device, the first multicast data may be a SYNC PDU, or an NR-U PDU, or a GTP-U PDU.

S802, the first network device determines that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cell.

Synchronous transmission is understood to mean that the same data are transmitted on the same resources at the same transmission time. The "other cell" may be a cell corresponding to other network devices than the first network device, or another cell corresponding to the first network device.

The specific implementation of step S802 will be described in detail below.

S803, the first network device sends the first multicast data to the terminal device on the first resource, where the first resource is a resource other than the second resource, and the second resource is used to transmit the multicast data of the first service in synchronization with other cells. Correspondingly, the terminal device receives the first multicast data on the first resource.

It may be appreciated that the second resource may be part or all of the third resource, which is a resource of the terminal device used for inter-cell synchronous transmission, that is, the third resource is a resource common to all services, and is not a resource specific to a certain service, and the second resource is a resource used for transmitting data of the first service in the third resource.

The first resource may be part or all of the resources other than the second resource. For example, the first resource may be part or all of the resources other than the third resource. Alternatively, the first resource may be part or all of the resources other than the second resource in the third resource. Alternatively, the first resource may include a part or all of the resources other than the second resource in the third resource, and a part or all of the resources other than the third resource.

Optionally, the first network device may further send first information to the terminal device, where the first information is used to indicate the first resource. The first network device enables the terminal device to receive multicast data from resources other than the SFN resource, i.e. the second resource, by indicating the first resource to the terminal device.

Three examples of the first information are described below.

In example one, the first information indicates a first search space. Wherein the first search space is used for detecting scheduling information of resources for transmitting multicast data by the terminal device.

In one specific implementation manner of the first example, the first information may indicate a duration of the first search space, and the duration of the first search space is greater than a duration of a search space corresponding to the second scheduling information. The search space corresponding to the second scheduling information is used for detecting the second scheduling information by the terminal equipment. The search space corresponding to the second scheduling information is hereinafter referred to as a second search space.

Wherein the second scheduling information is used for indicating the multicast data of the first service to be transmitted on the second resource in synchronization with other cells, and the first scheduling information is used for indicating the multicast data of the first service to be transmitted on the first resource.

Alternatively, if the second resource includes the PDCCH resource, the search space corresponding to the second scheduling information may also be described as the search space of the second resource. If the first resource includes the PDCCH resource, the search space corresponding to the first scheduling information may also be described as the search space of the first resource.

The duration may be the duration of one burst (burst) or may be understood as the number of consecutive time domain resources. The duration may also be referred to as a duration. Taking the duration of the second search space as an example, assume that the time domain resource unit is a time slot, as shown in fig. 9, slots 0-2 and slots 5-7 are second search spaces, where slots 0-2 can be regarded as a group of continuous time domain resources, can also be regarded as a burst, slots 5-7 can be regarded as a group of continuous time domain resources, can also be regarded as a burst, and the duration of the second search space is 3 time slots. As illustrated in connection with fig. 9, the duration of the second search space in fig. 9 is 3 slots, and the duration of the first search space in the embodiment of the present application may be greater than 3 slots, for example, the duration of the first search space is 4 slots, as shown in fig. 10, and the first search space includes slots 0 to 3 and slots 5 to 8. The terminal device may detect the first scheduling information on time slot 3 and time slot 8 so that multicast data may be received on a first resource other than the second resource according to the first scheduling information.

In the above example, by adding the time domain resource of the first search space, the first search space may further include a search space corresponding to the first scheduling information in addition to the search space corresponding to the second scheduling information, so that the terminal device may detect the first scheduling information in the search space other than the search space corresponding to the second scheduling information, and may further receive multicast data on the first resource.

In another specific implementation manner of the first example, the first information may indicate two sets of parameters of the first search space, where the first set of parameters may correspond to the first scheduling information, and the second set of parameters may correspond to the second scheduling information.

Wherein the first set of parameters may include, but is not limited to, at least one of: the method comprises the steps of monitoring a period of a PDCCH corresponding to first scheduling information, shifting time slots of the PDCCH corresponding to the first scheduling information, and continuously monitoring the number of time slots (duration) corresponding to the first scheduling information. As illustrated in fig. 9, the PDCCH corresponding to the first scheduling information has a listening period of 4 slots, an offset slot of 3, and a duration slot of 1, and based on this, slot 3 and slot 8 may be scheduled to receive data.

The second set of parameters may include, but is not limited to, at least one of: the monitoring period of the PDCCH corresponding to the second scheduling information, the offset time slot of the PDCCH corresponding to the second scheduling information, and the number (duration) of time slots of continuous monitoring corresponding to the second scheduling information. As illustrated in fig. 9, the PDCCH corresponding to the second scheduling information has a listening period of 4 slots, an offset slot of 0, and a duration slot of 3, based on which slots 0 to 2 and slots 5 to 7 can be scheduled to receive data.

In another example, the first information may indicate a third search space. The third search space is used for detecting the first scheduling information by the terminal equipment.

For example, referring to fig. 9, slots 0 to 2 and slots 5 to 7 are search spaces corresponding to the second scheduling information, and slots 3 and 8 may be search spaces corresponding to the first scheduling information, that is, the third search space.

In another example, the first information is DCI carried in the second resource, and the first information indicates the first resource. For example, the first information is a DCI with a format (format) of format 1-1 carried in the second resource, and may also be described as the first information is a DCI 1-1 carried in the second resource, where the DCI 1-1 may indicate whether to use K0 configured by RRC signaling and a specifically used K0 value. The present example may indicate the first resource by a K0 value, where the K0 value specifically refers to the number of slots offset between the Slot in which the resource scheduled by the DCI is located and the Slot in which the DCI is transmitted, and if DCI is transmitted in Slot n, k0=2, then the K0 value indicates the resource in the DCI schedule Slot n+2.

Typically, the DCI carried by the second resource can only schedule the second resource, i.e. the resource indicated by the K0 value is within the second resource, while this example indicates a resource other than the second resource by enabling the DCI carried by the second resource, e.g. may indicate the K0 value to the first resource by RRC signaling configuration, and indicates that the K0 value is used by the DCI 1-1 carried by the second resource, so that the terminal device may receive multicast data on the resource other than the second resource by the DCI detected in the second resource.

In a possible embodiment, the identity of the first scheduling information scrambling use is the same as the identity of the second scheduling information scrambling use. For example, the first scheduling information and the second scheduling information are both scrambled with a group radio network temporary identity (group radio network temporary identifier, G-RNTI).

In the above manner, the first scheduling information and the second scheduling information are scrambled by using the same identifier, so that the terminal device can determine that the multicast data transmitted on the first resource and the multicast data transmitted on the second resource belong to the same service.

According to the embodiment of the application, the multicast data which can not be synchronously transmitted with other cells is transmitted on the resources except the resources used for synchronously transmitting the multicast data in the cells, so that the received multicast data which can not be synchronously transmitted with other cells can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data in other cells is not affected, the defect of synchronous transmission of the multicast data at present can be overcome, the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and the service experience of the first service can be improved.

The implementation of S802 is illustrated below.

In one implementation, the first network device determines that the second multicast data is lost, and the first multicast data corresponds to the same wireless transport block as the second multicast data.

Where "second multicast data is lost" may refer to the first network device not receiving second multicast data from the superordinate node. Alternatively, it may also mean that the time when the first network device receives the second multicast data from the upper node is later than the time when the first network device transmits the second multicast data to the terminal device. Alternatively, it may also mean that the first network device does not receive the second multicast data before the transmission time. The "wireless transport blocks in which the first multicast data corresponds to the second multicast data" may be understood that if the second multicast data is successfully acquired, the first multicast data and the second multicast data should be encapsulated in the same wireless transport block for transmission. Or if the second multicast data is successfully acquired, the first multicast data and the second multicast data should be transmitted on the same wireless transport block.

The second multicast data corresponds to the same wireless transmission block as the first multicast data, and because the second multicast data is lost, the data included in the wireless transmission block is incomplete compared with the data included in the wireless transmission block of other cells, the wireless transmission block of the first network device cannot synchronously transmit with the wireless transmission block of other cells, so that the first multicast data included in the wireless transmission block of the first network device cannot synchronously transmit with the first multicast data of other cells.

According to the method and the device for transmitting the first multicast data to the terminal equipment on the resources except the second resources, the first multicast data can be transmitted to the terminal equipment under the condition that synchronous transmission of other cells is not affected, so that the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and further the service experience of the first service can be improved.

In a second implementation manner, after receiving the first time information, the first network device receives second time information, where the first time information indicates a transmission time of the first multicast data, and the second time information indicates a transmission time of the third multicast data, and the first multicast data and the third multicast data belong to the same multicast service. And determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells according to the second time information.

Optionally, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells according to the second time information may mean that the first multicast data cannot be completely transmitted or cannot be transmitted until the transmission time indicated by the second time information. Alternatively, it may be described that the transmission time of the first multicast data is determined to be after the transmission time indicated by the second time information, or that the interval between the transmission time of the first multicast data determined according to the first time information and the transmission time indicated by the second time information is less than or equal to a preset time, resulting in failure to complete the transmission of the first multicast data before the transmission time indicated by the second time information.

In one exemplary illustration, the first multicast data may be multicast data that is less than the multicast data that was transmitted prior to the transmission time indicated by the second time information among the multicast data corresponding to the first time information.

In a second implementation, the first time information is different from the second time information.

In one example, the time information corresponding to a set of multicast data acquired by the first network device may be the same, and it is assumed that multicast data group 1 corresponds to the first time information, and the next set of multicast data group 1, that is, multicast data group 2 corresponds to the second time information. The first time information and the second time information are different, and specifically, the transmission time indicated by the second time information is later than the transmission time indicated by the first time information.

The time information corresponding to the multicast data in the multicast data group 1 is first time information, that is, the sending time of the multicast data group 1 is determined according to the first time information, and the multicast data in the multicast data group 1 is sent in sequence according to the sending time. The time information corresponding to the multicast data in the multicast data group 2 is the second time information, that is, the sending time of the multicast data group 2 is determined according to the second time information, and the multicast data in the multicast data group 2 is sent in sequence according to the sending time.

Multicast data group 1 includes first multicast data and it is determined that the first multicast data is not transmitted as soon as it is transmitted according to the second time information.

In connection with the description of the foregoing term introduction 2), the first network device receives first time information indicating a time at which multicast data associated with the first time information is transmitted to the terminal device. The multicast data associated with the first time information should be transmitted before the transmission time indicated by the next time information, i.e., the second time information. If the multicast data associated with the first time information is not transmitted before the transmission time indicated by the second time information because the data amount is large, the first multicast data associated with the first time information is not transmitted before the transmission time indicated by the second time information. In order not to affect the synchronous transmission of the multicast data associated with the second time information later, in the embodiment of the present application, the first multicast data, which is the multicast data that is not transmitted, is transmitted to the terminal device on the resources other than the second resources. By the method, the first multicast data can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data associated with the second time information is not affected, so that the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and the service experience of the first service can be improved.

In a third implementation manner, the first network device determines that the acquisition time of the first multicast data is later than a first time or a second time, where the first time is a time for transmitting the first multicast data to the terminal device, the second time is before the first time, and the second time is spaced from the first time by a predetermined time length.

The time for acquiring the first multicast data may be the time for starting to acquire the first multicast data, or may be the time for completing the acquisition of the first multicast data.

The first time may be a time indicated by a time stamp at which the first multicast data is transmitted. The time stamp may refer to the related description in the foregoing term introduction 2), and a detailed description is not repeated here.

In the fourth implementation manner, the first network device cannot determine the sending condition of the multicast data before the first multicast data according to the information carried by the packet header of the first multicast data, so that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells.

In a specific implementation manner, the first network device cannot determine, according to information carried by a packet header of the first multicast data, a sending condition of the multicast data before the first multicast data, which may be: the packet division condition of the multicast data before the first multicast data, that is, the number of packets corresponding to the multicast data before the first multicast data and the data amount included in each packet, cannot be determined according to the information carried by the packet header of the first multicast data. The first network device cannot determine packet information of multicast data before the first multicast data, so that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells.

An application scenario of the fourth implementation is illustrated below. Before introducing a specific scenario, first, introducing a packet header Type of a data packet, where the packet header Type of the data packet has Type 1 (Type 1), where a packet header of the Type 1 may carry a data amount of data sent before a current data packet, and a packet division case of data not carrying data sent before the current data packet, that is, a data amount included in each data packet. Of course, the header Type of the data packet may also have other types such as Type 3 (Type 3), which is not described here.

An application scenario of the fourth implementation manner may be that a continuous packet loss occurs before the first multicast data, a packet header of the first multicast data is of Type 1, and the plurality of multicast data are associated with the same time information, where the time information indicates a time of transmitting the plurality of multicast data. In this scenario, the first network device may determine, according to the header of the first multicast data, the amount of data lost before the first multicast data, but cannot determine the packet division of the data lost before the first multicast data, which results in that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells.

For example, the multicast data 3 to 8 is associated with time information 1, the time information 1 indicating the time of transmitting the multicast data 3 to 8, and the multicast data 3 to 8 are sequentially transmitted when the transmission time indicated by the time information 1 is reached. It is assumed that the header of multicast data 6 indicates that 200 bytes of data were transmitted before multicast data 6, and the header of multicast data 2 that was successfully received last for the first multicast data indicates that 100 bytes of data were transmitted before this multicast data 2. The first network device may determine that 100 bytes of data are lost, i.e. that multicast data 3 to 5 total 100 bytes, but cannot determine the amount of data that multicast data 3 to 5 respectively comprise. The data division of the multicast data 3-5 affects the packet situation of the multicast data 6-8, i.e. the correspondence between the multicast data 6-8 and the wireless transmission block. Therefore, the first network device cannot determine the packet situation of the multicast data 6 to 8 because the data amounts included in the multicast data 3 to 5 respectively cannot be determined, and thus cannot synchronously transmit the first multicast data with the first multicast data of other cells.

Referring to fig. 11, another flow chart of a communication method provided in the present application is shown. The method comprises the following steps:

s1101, the first network device obtains first multicast data of the first service.

Step S1101 may specifically refer to S801 in fig. 8, and the description thereof is not repeated here.

S1102, the first network device sends scheduling information. The scheduling information is used for indicating resources for sending the first multicast data, if the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, the scheduling information is scrambled by adopting a first identifier, and if the first multicast data can be synchronously transmitted with the first multicast data of other cells, the scheduling information is scrambled by adopting a second identifier. Correspondingly, the terminal equipment adopts the first identifier and the second identifier to descramble the scheduling information.

Here, the "descrambling schedule information" may be described as "detection schedule information", or may be described as "listening schedule information", or the like.

For example, as shown in fig. 12, it is assumed that slots 0 to 2 and slots 5 to 7 are used for transmitting multicast data in synchronization with other cells. The first network device determines that multicast data on slot 0, slot 1 and slots 5-7 can be synchronously transmitted with the multicast data of other cells, and multicast data on slot 2 cannot be synchronously transmitted with the multicast data of other cells. The first network device adopts the second identifier to scramble the scheduling information of slot 0, slot 1 and slots 5-7, and adopts the first identifier to scramble the scheduling information of slot 2. Correspondingly, the terminal equipment adopts the first identifier and the second identifier to descramble the scheduling information of slots 0-2 and slots 5-7. If the scheduling information of slot 0, slot 1 and slots 5-7 adopts the second identification to descramble successfully, the terminal equipment receives the multicast data synchronously transmitted with other cells. If the scheduling information of the slot 2 adopts the first identification to descramble successfully, the terminal equipment determines that the multicast data sent by the cell on the slot 2 is asynchronous with the multicast data carried by other cells on the slot 2.

The first identity may be cell-level, or the first identity may be access network device-level, for example. For example, the first identity may be a cell-level G-RNTI.

The second identification may be an identification for semi-static scheduling. The second identity may be, for example, a configuration scheduling radio network temporary identity (configured scheduling radio network temporary identifier, CS-RNTI), or a group configuration scheduling radio network temporary identity (group configured scheduling radio network temporary identifier, G-CS-RNTI).

Alternatively, the first network device may determine that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cells by using the method described in S802 in fig. 8, and the specific implementation manner may refer to the related description in the implementation manner one, the implementation manner two and the implementation manner five of S802 in the method described in fig. 8, which are not repeated here.

In a possible implementation, before step S1102 or S1101, the first network device may configure the first identifier and the second identifier to the terminal device. For example, the first network device may send an identification of the multicast service corresponding to the first multicast data, such as a temporary mobile group identification (temporary mobile group identity, TMGI), a first identification, and a second identification, to the terminal device. Correspondingly, after receiving the identifier, the first identifier and the second identifier of the multicast service, the terminal device descrambles scheduling information of resources corresponding to the multicast service by adopting the first identifier and the second identifier.

In a specific embodiment, the first network device may instruct the terminal device to descramble the scheduling information by using the first identifier and the second identifier through RRC configuration information. Alternatively, the RRC configuration information may be sent on a multicast logical channel or in a system message.

Optionally, the first network device may further configure a search space corresponding to the scheduling information to the terminal device. Accordingly, the terminal device may descramble the scheduling information using the first identifier and the second identifier in the search space.

S1103, the first network device sends the first multicast data on the resource indicated by the scheduling information. Correspondingly, the terminal device receives the first multicast data on the resources indicated by the scheduling information.

In this way, the terminal device can distinguish between the multicast data that can be synchronized with other cells and the multicast data that cannot be synchronized with other cells, specifically, the multicast data received on the resource indicated by the scheduling information with successful descrambling by the first identifier is asynchronous with the multicast data sent by other cells on the resource indicated by the scheduling information, and the multicast data received on the resource indicated by the scheduling information with successful descrambling by the second identifier is synchronous with the multicast data sent by other cells on the resource indicated by the scheduling information.

According to the embodiment of the invention, the multicast data which can be synchronously transmitted with other cells and the multicast data which cannot be synchronously transmitted with other cells are distinguished through different RNTI, so that the network equipment can send the received multicast data which cannot be synchronously transmitted with other cells to the terminal equipment under the condition of reducing the influence of the multicast data which cannot be synchronously transmitted with other cells on a multicast data synchronous transmission mechanism, thereby overcoming the defect of synchronous transmission of the current multicast data, improving the transmission efficiency of the multicast data of the first service, improving the data integrity of the first service and improving the service experience of the first service. In addition, in the embodiment of the present application, the resource that transmits the multicast data that cannot be synchronously transmitted with other cells is still the resource that should be synchronously transmitted, and compared with the resource that transmits the multicast data that cannot be synchronously transmitted with other cells through other resources, the resource utilization rate can be improved, and the complexity of resource configuration can be reduced.

Referring to fig. 13, a further flow chart of a communication method provided in the present application is shown. The method comprises the following steps:

S1301, the first network device sends first configuration information to the terminal device. Correspondingly, the terminal equipment receives the first configuration information.

The first configuration information includes configuration information of a first radio link control RLC bearer and configuration information of a second RLC bearer, where the first RLC bearer is used for point-to-point transmission, and the second RLC bearer is used for point-to-multipoint transmission.

It should be noted that, the first configuration information may be sent by one message or may be sent by a plurality of messages, which is not specifically limited in this application. The message carrying the first configuration information may be an RRC reconfiguration message, an RRC restore message, a system message, or the like.

The first configuration information is exemplarily described below.

In an example one, the first configuration information further includes an identifier of a first multicast radio bearer and an identifier of a second multicast radio bearer, where an RLC bearer corresponding to the first multicast radio bearer includes the first RLC bearer, and an RLC bearer corresponding to the second multicast radio bearer includes the second RLC bearer.

For example, the first configuration information may include a radio bearer configuration and an RLC bearer configuration, where the radio bearer configuration may include a multicast radio bearer list, and the multicast radio bearer list includes an identifier of the first multicast radio bearer and an identifier of the second multicast radio bearer, and the multicast radio bearer list may further include identifiers of other multicast radio bearers, which are not specifically limited herein. Optionally, the radio bearer configuration may further include a PDCP configuration configured to be a PDCP corresponding to the first multicast radio bearer and a PDCP corresponding to the second multicast radio bearer.

The RLC bearer configuration may comprise at least one RLC configuration, in particular comprising a first RLC bearer and a second RLC bearer. The RLC bearer configuration may further include an identifier of a radio bearer corresponding to the at least one RLC bearer, and specifically, the RLC bearer configuration includes an identifier of a first multicast radio bearer corresponding to the first RLC bearer, and an identifier of a second multicast radio bearer corresponding to the second RLC bearer.

In example two, the first configuration information further includes an identifier of the first multicast radio bearer. The difference between the first example and the second example is that the second example does not include the identifier of the second multicast radio bearer.

One application scenario of the second example may be that the configuration information carried by the second RLC is configured for broadcasting. The first configuration information may not include an identification of the second multicast radio bearer.

In example three, the first configuration information may further include an identification of a third multicast radio bearer, where the RCL bearer corresponding to the third multicast radio bearer includes a first RLC bearer and a second RLC bearer.

For example, the first configuration information may include a radio bearer configuration and an RLC bearer configuration, wherein the radio bearer configuration may include a multicast radio bearer list including an identification of a third multicast radio bearer. In addition, the multicast radio bearer list may also include identification of other radio bearers, not specifically limited herein. Optionally, the radio bearer configuration may further include a PDCP configuration configured for PDCP corresponding to the third radio bearer.

The RLC bearer configuration may comprise at least one RLC configuration, in particular comprising a first RLC bearer and a second RLC bearer. The RLC bearer configuration may further include an identifier of a radio bearer corresponding to the at least one RLC bearer, and specifically, the RLC bearer configuration includes identifiers of third radio bearers corresponding to the first RLC bearer and the second RLC bearer.

In a fourth example, the first configuration information further includes an identifier of a fourth multicast radio bearer and an identifier of a first data radio bearer, where an RLC bearer corresponding to the fourth multicast radio bearer includes a second RLC bearer, and an RLC bearer corresponding to the first data radio bearer includes a first RLC bearer.

For example, the first configuration information may include a radio bearer configuration and an RLC bearer configuration, wherein the radio bearer configuration may include a multicast radio bearer list including an identification of the fourth multicast radio bearer and a data radio bearer identification, and the data radio bearer list includes an identification of the first data radio bearer. In addition, the multicast radio bearer list may further include an identifier of another multicast radio bearer, and the data radio bearer list may further include an identifier of another data radio bearer, which is not specifically limited herein. Optionally, the radio bearer configuration may further include a PDCP configuration configured to be a PDCP corresponding to the fourth multicast radio bearer and a PDCP corresponding to the first data radio bearer.

The RLC bearer configuration may comprise at least one RLC configuration, in particular comprising a first RLC bearer and a second RLC bearer. The RLC bearer configuration may further include an identifier of a radio bearer corresponding to the at least one RLC bearer, and specifically, the RLC bearer configuration includes an identifier of a fourth multicast radio bearer corresponding to the first RLC bearer, and an identifier of a first data radio bearer corresponding to the second RLC bearer.

In example five, the first configuration information further includes an identification of the first data radio bearer.

One application scenario of the fifth example may be that the configuration information carried by the second RLC is configured for broadcasting. The first configuration information may not include an identification of the fourth multicast radio bearer described above.

In S1302, the first network device acquires first multicast data of a first service.

Step S1302 may specifically refer to S801 in fig. 8, and the description thereof is not repeated here.

The first network device determines that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cell in S1303.

Alternatively, the first network device may determine that the first multicast data cannot be synchronously transmitted with the first multicast data of the other cells by using the method described in S802 in fig. 8, and the specific implementation manner may refer to the descriptions related to the implementation manner one to the implementation manner four of S802 in the method described in fig. 8, which are not repeated here.

The first network device sends the first multicast data over the first RLC bearer S1304. Correspondingly, the terminal device receives the first multicast data through the first RLC bearer.

According to the embodiment of the application, the multicast data which cannot be synchronously transmitted with other cells is transmitted to the terminal equipment in a point-to-point transmission mode, so that the received multicast data which cannot be synchronously transmitted with other cells can be transmitted to the terminal equipment under the condition that the synchronous transmission of the multicast data of other cells is not affected, the defect of a multicast data synchronous transmission mechanism can be overcome, the transmission efficiency of the multicast data of the first service can be improved, the data integrity of the first service can be improved, and the service experience of the first service can be improved.

The embodiment of the application provides a communication device. The communication device may be used to implement the functions of the terminal device according to the above embodiments, and the communication device may include the structure shown in fig. 5 and/or fig. 6.

The embodiment of the application provides a communication device. The communication device may be used to implement the functionality of the first network apparatus according to the above-described embodiments, and the communication device may include the structure shown in fig. 5 and/or fig. 7.

The embodiment of the application provides a communication system. The communication system may comprise at least one terminal device and at least one network device, wherein the terminal device and the network device in the communication system may perform the method as shown in any of the above-described method embodiments.

The present application further provides a computer readable storage medium, where a computer program is stored, where the computer program when executed by a computer may implement a procedure related to a terminal device or a first network device in any of the embodiments of the method described above.

The embodiments of the present application further provide a computer program product, where the computer program product is configured to store a computer program, where the computer program when executed by a computer may implement a procedure related to a terminal device or a first network device in any of the embodiments of the method described above.

The present application further provides a chip or a chip system, where the chip may include a processor, and the processor may be configured to invoke a program or an instruction in a memory to execute a procedure related to the terminal device or the first network device in any of the embodiments of the method described above. The chip system may include the chip, and may also include other components such as a memory or transceiver.

Embodiments of the present application also provide a circuit, which may be coupled to the memory, and may be configured to perform the process related to the terminal device or the first network device in any of the embodiments of the method described above. The chip system may include the chip, and may also include other components such as a memory or transceiver.

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

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

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

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

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A method of communication, the method comprising:

acquiring first multicast data of a first service;

determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells;

and transmitting the first multicast data to the terminal equipment on a first resource, wherein the first resource is a resource except a second resource, and the second resource is used for transmitting the multicast data of the first service synchronously with other cells.

2. The method of claim 1, wherein an identification of a first scheduling information scrambling employed is the same as an identification of a second scheduling information scrambling employed, wherein the first scheduling information is used to indicate transmission of multicast data for the first service on the first resource, and the second scheduling information is used to indicate transmission of multicast data for the first service on the second resource in synchronization with other cells.

3. The method of claim 1 or 2, wherein the method further comprises:

and sending first information to the terminal equipment, wherein the first information is used for indicating the first resource.

4. The method of claim 3, wherein the first information indicates a duration of a first search space that is greater than a duration of a search space corresponding to second scheduling information indicating transmission of multicast data of the first service on the second resource in synchronization with other cells.

5. The method of claim 3, wherein the first information is downlink control information, DCI, carried in the second resource, and the first information indicates the first resource.

6. The method of any of claims 1-5, wherein the determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells comprises:

and determining that second multicast data is lost, wherein the first multicast data corresponds to the same wireless transmission block as the second multicast data.

7. The method of any of claims 1-5, wherein the determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells comprises:

after receiving the first time information, receiving second time information, wherein the first time information indicates the sending time of the first multicast data, the second time information indicates the sending time of the third multicast data, and the first multicast data and the third multicast data belong to the same multicast service;

and determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells according to the second time information.

8. The method of any of claims 1-5, wherein the determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells comprises:

determining that the acquisition time of the first multicast data is later than a first time or a second time, wherein the first time is the time for transmitting the first multicast data to the terminal equipment, the second time is positioned before the first time, and the second time is a preset time length with the first time interval.

9. A method of communication, the method comprising:

acquiring first multicast data of a first service;

transmitting scheduling information, wherein the scheduling information is used for indicating a resource for transmitting the first multicast data, if the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, the scheduling information adopts a first identifier to scramble, and if the first multicast data can be synchronously transmitted with the first multicast data of other cells, the scheduling information adopts a second identifier to scramble;

and transmitting the first multicast data on the resources indicated by the scheduling information.

10. The method of claim 9, wherein the first identification is cell-level or the first identification is access network device-level.

11. The method according to claim 9 or 10, wherein the second identity is an identity for semi-persistent scheduling.

12. The method of any one of claims 9-11, wherein the method further comprises:

if the second multicast data is lost, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells;

wherein the first multicast data corresponds to the same wireless transport block as the second multicast data.

13. The method of any one of claims 9-11, wherein the method further comprises:

if the acquisition time of the first multicast data is later than the first time or the second time, determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells;

the first time is a time for sending the first multicast data to the terminal equipment, the second time is located before the first time, and the second time is spaced from the first time by a preset time length.

14. A method of communication, the method comprising:

descrambling scheduling information by adopting a first identifier and a second identifier, wherein the first identifier is used for descrambling scheduling information of resources which cannot synchronously transmit multicast data with other cells, and the second identifier is used for descrambling scheduling information of resources which can synchronously transmit multicast data with other cells;

and receiving multicast data according to the scheduling information.

15. The method of claim 14, wherein the first identification is cell-level or the first identification is access network device-level.

16. The method of claim 14 or 15, wherein the second identification is an identification for semi-persistent scheduling.

17. A communication device, the device comprising:

the processing module is used for acquiring first multicast data of a first service; and

and the receiving and transmitting module is used for transmitting the first multicast data to the terminal equipment on a first resource, wherein the first resource is a resource except a second resource, and the second resource is used for transmitting the multicast data of the first service synchronously with other cells.

18. The apparatus of claim 17, wherein an identity employed by a first scheduling information scrambling is the same as an identity employed by a second scheduling information scrambling, wherein the first scheduling information is used to indicate transmission of multicast data for the first service on the first resource, and the second scheduling information is used to indicate transmission of multicast data for the first service on the second resource in synchronization with other cells.

19. The apparatus of claim 17 or 18, wherein the transceiver module is further configured to:

20. The apparatus of claim 19, wherein the first information indicates a duration of a first search space that is greater than a duration of a search space corresponding to second scheduling information indicating transmission of multicast data of the first traffic on the second resource in synchronization with other cells.

21. The apparatus of claim 19, wherein the first information is downlink control information, DCI, carried in the second resource, and the first information indicates the first resource.

22. The apparatus according to any of claims 17-21, wherein the processing module, when determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, is specifically configured to:

23. The apparatus according to any of claims 17-21, wherein the processing module, when determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, is specifically configured to:

after receiving first time information through the transceiver module, receiving second time information through the transceiver module, wherein the first time information indicates the sending time of the first multicast data, the second time information indicates the sending time of third multicast data, and the first multicast data and the third multicast data belong to the same multicast service;

24. The apparatus according to any of claims 17-21, wherein the processing module, when determining that the first multicast data cannot be synchronously transmitted with the first multicast data of other cells, is specifically configured to:

25. A communication device, the device comprising:

the processing module is used for acquiring first multicast data of a first service;

a transceiver module, configured to send scheduling information, where the scheduling information is used to indicate a resource for sending the first multicast data, where if the first multicast data cannot be synchronously transmitted with the first multicast data in other cells, the scheduling information is scrambled with a first identifier, and if the first multicast data can be synchronously transmitted with the first multicast data in other cells, the scheduling information is scrambled with a second identifier;

26. The apparatus of claim 25, wherein the first identification is cell-level or the first identification is access network device-level.

27. The apparatus of claim 25 or 26, wherein the second identification is an identification for semi-persistent scheduling.

28. The apparatus of any of claims 25-27, wherein the processing module is further to:

29. The apparatus of any of claims 25-27, wherein the processing module is further to:

30. A communication device, the device comprising:

the receiving and transmitting module is used for communicating with the network equipment;

The processing module is used for descrambling scheduling information by adopting a first identifier and a second identifier, wherein the first identifier is used for descrambling scheduling information of resources which cannot synchronously transmit multicast data with other cells, and the second identifier is used for descrambling scheduling information of resources which can synchronously transmit multicast data with other cells; and

and receiving multicast data through the receiving and transmitting module according to the scheduling information.

31. The apparatus of claim 30, wherein the first identification is cell-level or the first identification is access network device-level.

32. The apparatus of claim 30 or 31, wherein the second identification is an identification for semi-persistent scheduling.

33. A communication device, comprising: a processor coupled to a memory, the memory for storing instructions;

the processor is configured to invoke and execute the instructions from the memory, to cause the communication device to perform the method according to any of claims 1-8, or to cause the communication device to perform the method according to any of claims 9-13.

34. A communication device, comprising: a processor coupled to a memory, the memory for storing instructions;

The processor is configured to invoke and execute the instructions from the memory, to cause the communication device to perform the method according to any of claims 14-16.

35. A computer readable storage medium having instructions stored therein which, when invoked for execution on a computer, cause the computer to perform the method of any one of claims 1-16.

36. A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of claims 1-16.

37. A circuit coupled to a memory for reading and executing instructions stored in the memory to perform the method of any one of claims 1-16.