CN109565645B

CN109565645B - Multicast service transmission method, terminal, base station and communication system

Info

Publication number: CN109565645B
Application number: CN201680088281.8A
Authority: CN
Inventors: 沈兴亚; 花梦; 铁晓磊; 周涵; 汲桐
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-08-11
Filing date: 2016-11-04
Publication date: 2021-05-18
Anticipated expiration: 2036-11-04
Also published as: WO2018028062A1; CN109565645A

Abstract

The embodiment of the invention provides a multicast service transmission method, a terminal, a base station and a communication system, wherein the method comprises the following steps: receiving multicast service data sent by core network equipment; acquiring transmission indication information of multicast service; the transmission indication information includes: the transmission mode of the multicast service data and the transmission times; and sending the transmission indication information to a terminal, and transmitting the multicast service data to the terminal according to the transmission indication information. The multicast service transmission method, the terminal, the base station and the communication system provided by the embodiment of the invention can improve the probability of successfully receiving the multicast service data by the terminal and enhance the robustness of the multicast service by increasing the transmission times of the multicast service data when the data volume of the multicast service data is large.

Description

Multicast service transmission method, terminal, base station and communication system

Technical Field

The present invention relates to communications technologies, and in particular, to a multicast service transmission method, a terminal, a base station, and a communication system.

Background

A Narrow-Band Internet of Things (NB-IoT) based on honeycomb deployed in a Long Term Evolution (LTE) system is a branch of the Internet of everything, and has the characteristics of wide coverage, more connections, low speed, low cost, low power consumption, excellent architecture and the like. Therefore, the NB-IoT can provide support for massive Internet of things terminals with low throughput, low cost and low energy consumption. The terminal can be, for example, a smart meter, a smart water meter, a smart parking device, and the like.

In the prior art, a base station in an NB-IoT may send multicast service data sent by core network equipment to all terminals in a Cell coverage area through a Single Cell Point to multipoint (SC-PTM for short) multicast technology. The multicast service corresponding to the multicast service data may be, for example, a software upgrade service, an emergency notification service in an area, and the like. In a specific implementation, the base station may map the multicast service data to a plurality of transport blocks according to the size of the transport block, and then sequentially transmit each transport block to all terminals in the cell, so as to achieve the purpose of transmitting the multicast service data to the terminals.

However, when the data amount of the multicast service data is large, the number of the transmission blocks corresponding to the multicast service data is also large, so that when the base station transmits the multicast service data in a manner of sequentially transmitting each transmission block to all terminals of the cell, the probability that the terminal successfully receives the multicast service data is low, and therefore, how the base station transmits the multicast service data to the terminals to enhance the robustness of the multicast service is an urgent problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a multicast service transmission method, a terminal, a base station and a communication system, which are used for enhancing the robustness of a multicast service.

In a first aspect, an embodiment of the present invention provides a method for transmitting a multicast service, including: receiving multicast service data sent by core network equipment; acquiring transmission indication information of multicast service; the transmission indication information includes: the transmission mode of the multicast service data and the transmission times; and sending the transmission indication information to a terminal, and transmitting the multicast service data to the terminal according to the transmission indication information.

With the multicast service transmission method provided in the first aspect, after receiving the multicast service data sent by the core network device, the base station may obtain the transmission mode including the multicast service data and the transmission indication information of the transmission times, so that the base station may transmit the multicast service data to the terminal for multiple times according to the transmission indication information, and simultaneously, the base station may also send the transmission indication information to the terminal, so that the terminal may correctly receive the multicast service data sent by the base station for multiple times according to the transmission indication information. Therefore, the multicast service transmission method provided by the embodiment of the invention can improve the probability of successfully receiving the multicast service data by the terminal and enhance the robustness of the multicast service by increasing the transmission times of the multicast service data when the data volume of the multicast service data is large.

Optionally, in a possible implementation manner of the first aspect, the multicast service data includes: a plurality of multicast service data units, each of which comprises at least one multicast service data packet; the number of the multicast service data units included in the multicast service data is determined by the base station.

Optionally, in a possible implementation manner of the first aspect, a transmission mode of the multicast service data is: transmitting the multicast service data to the terminal by taking all the data of the multicast service data as a repeated transmission unit; the transmitting the multicast service data to the terminal according to the transmission indication information includes: and according to the transmission times, repeatedly transmitting the multicast service data to the terminal by taking all the data of the multicast service data as a repeated transmission unit.

Optionally, in a possible implementation manner of the first aspect, a transmission mode of the multicast service data is: transmitting the multicast service data to the terminal by taking the multicast service data unit as a repeated transmission unit; the transmitting the multicast service data to the terminal according to the transmission indication information includes: and according to the transmission times, taking the multicast service data unit as a repeated transmission unit, and repeatedly transmitting the multicast service data to the terminal.

Optionally, in a possible implementation manner of the first aspect, a transmission mode of the multicast service data is: transmitting the multicast service data to the terminal by taking the multicast service data packet as a repeated transmission unit; the transmitting the multicast service data to the terminal according to the transmission indication information includes: and according to the transmission times, taking the multicast service data packet as a repeated transmission unit, and repeatedly transmitting the multicast service data to the terminal.

Optionally, in a possible implementation manner of the first aspect, the acquiring transmission indication information of the multicast service includes: and determining the transmission indication information of the multicast service according to the service type of the multicast service data and the mapping relation between the preset service type and the transmission indication information.

Optionally, in a possible implementation manner of the first aspect, the acquiring transmission indication information of the multicast service includes: and receiving the transmission indication information of the multicast service sent by the core network equipment.

Optionally, in a possible implementation manner of the first aspect, the method further includes: and sending multicast service notification information to the terminal, wherein the multicast service notification information is used for indicating the number of multicast service data packets of the multicast service data to the terminal.

By the multicast service transmission method provided by the possible embodiment, the base station can send the multicast service notification information to the terminal, so that after the terminal receives the multicast service notification information, whether all multicast service data packets of the multicast service data have been received or not can be judged according to the number of the multicast service data packets successfully received by the terminal, and further, the terminal can be ensured to correctly and completely receive the multicast service data by the method, the probability of successfully receiving the multicast service data by the terminal is improved, and the robustness of the multicast service is enhanced.

Optionally, in a possible implementation manner of the first aspect, before sending the multicast service data to the terminal according to the transmission indication information, the method further includes: generating first indication information for the multicast service data packet of the multicast service data according to the number of the multicast service data packets, wherein the first indication information is used for indicating the identifier of the multicast service data packet to the terminal; the sending the multicast service data to the terminal according to the transmission indication information includes: and sending the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information.

Through the multicast service transmission method provided by the possible embodiment, the base station may generate, for each multicast service data packet, first indication information for indicating an identifier of the multicast service data packet, and when transmitting multicast service data to the terminal according to the transmission indication information, transmit the first indication information to the terminal along with the multicast service data packet, so that the terminal may determine whether the multicast service data packet has been successfully received according to the first indication information, and when determining that the multicast service data packet has not been successfully received, may continue to receive the multicast service data packet transmitted by the base station, and when determining that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, the terminal may ignore the multicast service data packet transmitted by the base station, and does not perform any processing. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

In a second aspect, an embodiment of the present invention provides a method for transmitting a multicast service, including: receiving transmission indication information sent by a base station; the transmission indication information includes: the transmission mode of the multicast service data and the transmission times; and receiving the multicast service data transmitted by the base station according to the transmission indication information.

By the multicast service transmission method provided by the second aspect, the terminal may receive the transmission indication information sent by the base station, so that the terminal may correctly receive the multicast service data that is transmitted to the terminal by the base station for multiple times according to the transmission indication information. Therefore, the multicast service transmission method provided by the embodiment of the invention can improve the probability of successfully receiving the multicast service data by the terminal and enhance the robustness of the multicast service by increasing the transmission times of the multicast service data when the data volume of the multicast service data is large.

Optionally, in a possible implementation manner of the second aspect, the multicast service data includes: a plurality of multicast service data units, each of which comprises at least one multicast service data packet; the number of multicast service data units included in the multicast service data is determined by the base station.

Optionally, in a possible implementation manner of the second aspect, a transmission mode of the multicast service data is: receiving the multicast service data transmitted by the base station by taking all data of the multicast service data as a repeated transmission unit; the receiving the multicast service data transmitted by the base station according to the transmission indication information includes: and receiving the multicast service data repeatedly transmitted by the base station by taking all the data of the multicast service data as a repeated transmission unit according to the transmission times.

Optionally, in a possible implementation manner of the second aspect, a transmission mode of the multicast service data is: receiving the multicast service data transmitted by the base station by taking the multicast service data unit as a repeated transmission unit; the receiving the multicast service data transmitted by the base station according to the transmission indication information includes: and receiving the multicast service data repeatedly transmitted by the base station by taking the multicast service data unit as a repeated transmission unit according to the transmission times.

Optionally, in a possible implementation manner of the second aspect, a transmission mode of the multicast service data is: receiving the multicast service data transmitted by the base station by taking the multicast service data packet as a repeated transmission unit; the receiving the multicast service data transmitted by the base station according to the transmission indication information includes: and receiving the multicast service data repeatedly transmitted by the base station by taking the multicast service data packet as a repeated transmission unit according to the transmission times.

Optionally, in a possible implementation manner of the second aspect, the method further includes: and receiving multicast service notification information sent by the base station, wherein the multicast service notification information is used for indicating the number of multicast service data packets of the multicast service data.

By the multicast service transmission method provided by the possible implementation manner, the terminal can receive the multicast service notification information sent by the base station, so that the terminal can judge whether all multicast service data packets of the multicast service data have been received or not according to the number of the multicast service data packets successfully received by the terminal, and further the terminal can be ensured to correctly and completely receive the multicast service data by the method, the probability of successfully receiving the multicast service data by the terminal is improved, and the robustness of the multicast service is enhanced.

Further, in a possible implementation manner of the second aspect, the receiving, according to the transmission indication information, the multicast service data transmitted by the base station includes: receiving first indication information sent by the base station according to the transmission indication information, wherein the first indication information is used for indicating the identifier of the multicast service data packet; the first indication information is indication information generated by the base station for the multicast service data packet of the multicast service data according to the number of the multicast service data packets; determining whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received or not according to the first indication information; and when the multicast service data packet indicated by the identifier of the multicast service data packet is determined to be unsuccessfully received, continuously receiving the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station according to the transmission indication information.

Through the multicast service transmission method provided by the possible embodiment, the terminal may receive, according to the transmission indication information, the first indication information generated by the base station for each multicast service data packet and used for indicating the identifier of the multicast service data packet, so that the terminal may determine, according to the first indication information, whether the multicast service data packet has been successfully received, and when it is determined that the multicast service data packet has not been successfully received, may continue to receive the multicast service data packet sent by the base station, and when it is determined that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, the terminal may ignore the multicast service data packet transmitted by the base station, and does not perform any processing. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

Further, in a possible implementation manner of the second aspect, after the continuing to receive the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station, the method further includes: and recording the identifier of the multicast service data packet when the multicast service data packet corresponding to the identifier of the multicast service data packet is successfully received.

With the multicast service transmission method provided by this possible embodiment, after determining that the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station is successfully received, the terminal may record the identifier of the multicast service data packet, so that after receiving the first indication information generated by the base station for each multicast service data packet and indicating the identifier of the multicast service data packet, the terminal may determine whether the multicast service data packet indicated by the first indication information has been successfully received according to the identifier of the multicast service data packet that has been successfully received and the identifier of the multicast service data packet in the first indication information, and when determining that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, continue to receive the multicast service data packet sent by the base station, and when determining that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, the terminal can ignore the multicast service data packet transmitted by the base station and does not perform any processing. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

Optionally, in a possible implementation manner of the second aspect, the determining, according to the first indication information, whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received includes: judging whether the recorded identification of the multicast service data packet contains the identification of the multicast service data packet, and if the recorded identification of the multicast service data packet does not contain the identification of the multicast service data packet, determining that the multicast service data packet corresponding to the identification of the multicast service data packet is not successfully received.

In a third aspect, an embodiment of the present invention provides a base station, where the base station includes:

the receiver is used for receiving the multicast service data sent by the core network equipment; the processor is used for acquiring the transmission indication information of the multicast service; the transmission indication information includes: the transmission mode of the multicast service data and the transmission times; and the transmitter is used for sending the transmission indication information to a terminal and transmitting the multicast service data to the terminal according to the transmission indication information.

With the base station provided in the third aspect, after the receiver of the base station receives the multicast service data sent by the core network device, the processor of the base station may obtain the transmission mode including the multicast service data and the transmission indication information of the transmission times, so that the transmitter of the base station may transmit the multicast service data to the terminal for multiple times according to the transmission indication information, and simultaneously the transmitter of the base station may also send the transmission indication information to the terminal, so that the terminal may correctly receive the multicast service data sent by the base station for multiple times according to the transmission indication information. Therefore, when the data volume of the multicast service data is large, the probability of successfully receiving the multicast service data by the terminal is improved by increasing the transmission times of the multicast service data, and the robustness of the multicast service is enhanced.

Optionally, in a possible implementation manner of the third aspect, the multicast service data includes: a plurality of multicast service data units, each of which comprises at least one multicast service data packet; the number of multicast service data units included in the multicast service data is determined by the base station.

Optionally, in a possible implementation manner of the third aspect, a transmission mode of the multicast service data is: and in the case that the multicast service data is transmitted to the terminal with all the data of the multicast service data as a retransmission unit, the transmitter is specifically configured to repeatedly transmit the multicast service data to the terminal with all the data of the multicast service data as the retransmission unit according to the transmission times.

Optionally, in a possible implementation manner of the third aspect, a transmission mode of the multicast service data is: and under the condition that the multicast service data unit is used as a repeat transmission unit to transmit the multicast service data to the terminal, the transmitter is specifically used for repeatedly transmitting the multicast service data to the terminal according to the transmission times by using the multicast service data unit as a repeat transmission unit.

Optionally, in a possible implementation manner of the third aspect, a transmission mode of the multicast service data is: and under the condition that the multicast service data is transmitted to the terminal by taking the multicast service data packet as a repeat transmission unit, the transmitter is specifically configured to repeat transmission of the multicast service data to the terminal by taking the multicast service data packet as a repeat transmission unit according to the transmission times.

Optionally, in a possible implementation manner of the third aspect, the processor is specifically configured to determine the transmission indication information of the multicast service according to a service type of the multicast service data and a mapping relationship between a preset service type and the transmission indication information.

Optionally, in a possible implementation manner of the third aspect, the processor is specifically configured to control the receiver to receive transmission indication information of the multicast service sent by the core network device.

Optionally, in a possible implementation manner of the third aspect, the transmitter is further configured to send multicast service notification information to the terminal, where the multicast service notification information is used to indicate, to the terminal, the number of multicast service data packets of the multicast service data.

With the base station provided by this possible embodiment, the transmitter of the base station may also send multicast service notification information to the terminal, so that after receiving the multicast service notification information, the terminal may determine whether all multicast service data packets of the multicast service data have been received according to the number of the multicast service data packets successfully received by the terminal, and thus, by this way, the terminal may be ensured to correctly and completely receive the multicast service data, the probability that the terminal successfully receives the multicast service data is improved, and the robustness of the multicast service is enhanced.

Optionally, in a possible implementation manner of the third aspect, the processor is further configured to generate, before the transmitter sends the multicast service data to the terminal according to the transmission indication information, first indication information for a multicast service data packet of the multicast service data according to the number of the multicast service data packets, where the first indication information is used to indicate an identifier of the multicast service data packet to the terminal; the transmitter is specifically configured to send the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information.

With the base station provided in this possible embodiment, the processor of the base station may generate, for each multicast service data packet, first indication information indicating an identifier of the multicast service data packet, so that when the transmitter of the base station sends the multicast service data to the terminal according to the transmission indication information, the first indication information can be sent to the terminal along with the multicast service data packet, so that the terminal can determine whether the multicast service data packet has been successfully received according to the first indication information, and will continue to receive the multicast service data packet sent by the transmitter of the base station only when it is determined that the multicast service data packet is not successfully received, and when the multicast service data packet corresponding to the multicast service data packet identifier is determined to be successfully received, the terminal can ignore the multicast service data packet transmitted by the base station and does not perform any processing. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

In a fourth aspect, an embodiment of the present invention provides a terminal, where the terminal includes:

the receiver is used for receiving the transmission indication information sent by the base station; a processor, configured to control the receiver to receive the multicast service data transmitted by the base station according to the transmission indication information; the transmission indication information includes: the transmission mode of the multicast service data and the transmission times.

With the terminal provided in the fourth aspect, the receiver of the terminal may receive the transmission indication information sent by the base station, so that the processor of the terminal may correctly control the receiver to receive the multicast service data that is transmitted to the terminal by the base station for multiple times according to the transmission indication information. Therefore, when the data volume of the multicast service data is large, the probability of successfully receiving the multicast service data by the terminal is improved by increasing the transmission times of the multicast service data, and the robustness of the multicast service is enhanced.

Optionally, in a possible implementation manner of the fourth aspect, the multicast service data includes: a plurality of multicast service data units, each of which comprises at least one multicast service data packet; the number of multicast service data units included in the multicast service data is determined by the base station.

Optionally, in a possible implementation manner of the fourth aspect, a transmission mode of the multicast service data is: and in the case that all the data of the multicast service data are used as the retransmission unit to receive the multicast service data transmitted by the base station, the processor is specifically configured to control the receiver to receive the multicast service data repeatedly transmitted by the base station according to the transmission times and with all the data of the multicast service data as the retransmission unit.

Optionally, in a possible implementation manner of the fourth aspect, a transmission mode of the multicast service data is: and in the case that the multicast service data unit is used as a repeat transmission unit to receive the multicast service data transmitted by the base station, the processor is specifically configured to control the receiver to receive the multicast service data repeatedly transmitted by the base station according to the transmission times and by using the multicast service data unit as a repeat transmission unit.

Optionally, in a possible implementation manner of the fourth aspect, a transmission mode of the multicast service data is: and under the condition that the multicast service data transmitted by the base station is received by taking the multicast service data packet as a repeat transmission unit, the processor is specifically configured to control the receiver to receive the multicast service data repeatedly transmitted by the base station by taking the multicast service data packet as a repeat transmission unit according to the transmission times.

Optionally, in a possible implementation manner of the fourth aspect, the receiver is further configured to receive multicast service notification information sent by the base station, where the multicast service notification information is used to indicate, to the terminal, the number of multicast service data packets of the multicast service data.

With the terminal provided by the possible embodiment, the receiver of the terminal can receive the multicast service notification information sent by the base station, so that the processor of the terminal can judge whether all multicast service data packets of the multicast service data have been received according to the number of the multicast service data packets successfully received by the processor of the terminal, and further, the terminal can be ensured to correctly and completely receive the multicast service data by the method, the probability of successfully receiving the multicast service data by the terminal is improved, and the robustness of the multicast service is enhanced.

Further, in a possible implementation manner of the fourth aspect, the processor is specifically configured to control the receiver to receive, according to the transmission indication information, first indication information sent by the base station, determine, according to the first indication information, whether a multicast service data packet corresponding to an identifier of the multicast service data packet has been successfully received, and when it is determined that the multicast service data packet indicated by the identifier of the multicast service data packet has not been successfully received, control the receiver to continue to receive, according to the transmission indication information, the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station; the first indication information is used for indicating the identifier of the multicast service data packet; the first indication information is indication information generated by the base station for the multicast service data packet of the multicast service data according to the number of the multicast service data packets.

With the terminal provided by this possible embodiment, the processor of the terminal may receive, according to the transmission indication information, the first indication information that is generated by the base station for each multicast service data packet and used for indicating the identifier of the multicast service data packet, so that the processor of the terminal may determine, according to the first indication information, whether the multicast service data packet has been successfully received, and when it is determined that the multicast service data packet has not been successfully received, the processor of the terminal may continue to receive the multicast service data packet sent by the base station, and when it is determined that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, the processor of the terminal may ignore the multicast service data packet transmitted by the base station and does not perform any processing. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

Further, in a possible implementation manner of the fourth aspect, the processor is further configured to, after controlling the receiver to continue receiving the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station, record the identifier of the multicast service data packet when it is determined that the multicast service data packet corresponding to the identifier of the multicast service data packet is successfully received.

With the terminal provided in this possible embodiment, after determining that the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station is successfully received, the processor of the terminal may record the identifier of the multicast service data packet, so that after controlling the receiver to receive the first indication information generated by the base station for each multicast service data packet and indicating the identifier of the multicast service data packet, the processor of the terminal may determine whether the multicast service data packet indicated by the first indication information has been successfully received according to the recorded identifier of the multicast service data packet successfully received and the identifier of the multicast service data packet in the first indication information, and when determining that the multicast service data packet has not been successfully received, may control the receiver to continue receiving the multicast service data packet sent by the base station, and when determining that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, the terminal can ignore the multicast service data packet transmitted by the base station and does not perform any processing. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

Optionally, in a possible implementation manner of the fourth aspect, the processor is configured to determine, according to the first indication information, whether a multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, specifically: the processor is specifically configured to determine whether the identifier of the recorded multicast service data packet includes the identifier of the multicast service data packet, and determine that the multicast service data packet corresponding to the identifier of the multicast service data packet is not successfully received when it is determined that the identifier of the recorded multicast service data packet does not include the identifier of the multicast service data packet.

The beneficial effects of the terminal provided by the fourth aspect and each possible implementation manner of the fourth aspect may refer to the beneficial effects brought by each possible implementation manner of the first aspect, and are not described herein again.

In a fifth aspect, an embodiment of the present invention provides a communication system, where the communication system includes: the base station provided in each possible implementation manner of the third aspect and the third aspect, and the terminal provided in each possible implementation manner of the fourth aspect and the fourth aspect.

With the communication system provided in the fifth aspect, after receiving the multicast service data sent by the core network device, the base station may obtain the transmission mode including the multicast service data and the transmission indication information of the transmission times, so that the base station may transmit the multicast service data to the terminal for multiple times according to the transmission indication information, and simultaneously, the base station may also send the transmission indication information to the terminal, so that the terminal may correctly receive the multicast service data sent by the base station for multiple times according to the transmission indication information. Therefore, the multicast service transmission method provided by the embodiment of the invention can improve the probability of successfully receiving the multicast service data by the terminal and enhance the robustness of the multicast service by increasing the transmission times of the multicast service data when the data volume of the multicast service data is large.

In the multicast service transmission method, the terminal, the base station and the communication system provided in the embodiments of the present invention, after receiving multicast service data sent by a core network device, the base station may obtain a transmission mode including the multicast service data and transmission indication information of transmission times, so that the base station may transmit the multicast service data to the terminal for multiple times according to the transmission indication information, and simultaneously, the base station may also send the transmission indication information to the terminal, so that the terminal may correctly receive the multicast service data sent by the base station for multiple times according to the transmission indication information. Therefore, the multicast service transmission method provided by the embodiment of the invention can improve the probability of successfully receiving the multicast service data by the terminal and enhance the robustness of the multicast service by increasing the transmission times of the multicast service data when the data volume of the multicast service data is large.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a signaling interaction flow chart of a multicast service transmission method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of multicast service data according to an embodiment of the present invention;

fig. 3 is a schematic diagram of another multicast service data according to an embodiment of the present invention;

fig. 4 is a schematic diagram of another multicast service data according to an embodiment of the present invention;

fig. 5 is a signaling interaction flowchart of another multicast service transmission method according to an embodiment of the present invention;

fig. 6 is a signaling interaction flow diagram of a third embodiment of a multicast service transmission method according to the present invention;

fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 9 is a block diagram of a structure of a terminal in the case where the terminal is a mobile phone according to the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A terminal according to embodiments of the present invention may refer to a device that provides voice and/or data connectivity to a user, a handheld device having wireless connectivity, or other processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. The wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), a User Device (User Device), or a User Equipment (User Equipment).

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

The multicast service transmission method provided by the embodiment of the invention can be suitable for the base station and the terminal in NB-IoT deployed on any communication system. Here, the communication may be, for example, a 2G communication system, a 3G communication system, an LTE communication system, a 5G communication system, or the like.

Taking NB-IoT deployed in an LTE system as an example, when a core network device multicasts a certain multicast Service Data to each terminal in a cell through a base station, the base station may first split the Service Data into a plurality of Packet Data Convergence Protocol (PDCP) Service Data Unit (Service Unit, SDU) packets in a network layer, and then map each PDCP SDU Packet to a plurality of TBs in a physical layer according to the size of a Transport Block (TB), so that the base station can multicast the multicast Service Data to the terminals in the physical layer in a manner of sequentially multicasting each TB to all terminals interested in the multicast Service Data in the cell.

In the prior art, the data volume that can be carried by the largest PDCP SDU packet supported by the base station is 1.5kB, and the maximum TB supported by the NB-IoT base station is 680 bits. If the data amount of a certain multicast service data multicast to the terminal by the base station is large, taking 200kB as an example, at this time, even if the base station splits the multicast service data by using the largest PDCP SDU packet and maps each PDCP SDU packet by using the largest TB, each PDCP SDU packet will still be mapped to about 20 TBs. However, when the base station transmits each PDCP SDU of the software upgrade service to the terminal by 20 TBs, the probability of at least one error in the 20 TBs received by the terminal is about 87%, and therefore, for the terminal, the probability of the PDCP SDU packet reception failure is high, resulting in a high probability of multicast service data reception failure. Therefore, how to repeatedly transmit the multicast service data to the terminal when the base station transmits the multicast service data to the terminal so that the terminal can successfully receive the multicast service data is a problem to be solved urgently.

The multicast service transmission method provided by the embodiment of the invention aims to solve the technical problem that how a base station transmits multicast service data to a terminal to enhance the robustness of the multicast service when the data volume of the multicast service data is large in the prior art.

The following application documents take NB-IoT base stations and terminals deployed in an LTE system as examples to describe the multicast service transmission method provided in the embodiments of the present invention, but those skilled in the art can understand that the multicast service transmission method according to the embodiments of the present invention includes, but is not limited to, the above application scenarios and devices, and the multicast service transmission method provided in the embodiments of the present invention can be adopted as long as the scenarios and devices related to transmitting multicast service data are involved.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a signaling interaction flowchart of a multicast service transmission method according to an embodiment of the present invention. The first embodiment relates to a specific process of transmitting, by a base station, multicast service data to a terminal according to acquired transmission indication information of a multicast service. As shown in fig. 1, the method includes:

s101, the base station receives multicast service data sent by core network equipment.

Specifically, when the core network device needs to transmit a certain service to each terminal in the cell coverage through the base station, the base station may receive the multicast service data sent by the core network device. The multicast service data may be multicast service data with a large data volume, such as a software upgrade service, an emergency notification service, and the like. In this embodiment, the core network device may be, for example, an application server, a core network server gateway, a mobility management entity, and the like.

S102, the base station acquires the transmission indication information of the multicast service.

Specifically, after receiving the multicast service data sent by the core network device, the base station may obtain a transmission mode including the multicast service data and transmission indication information of the transmission times. The transmission mode of the multicast service data is used for indicating the repeated transmission unit adopted by the base station to repeatedly transmit the multicast service data to the terminal. The retransmission unit may be, for example, a Transport Block (TB), a whole Multicast service data (Multicast Session), a Segment (Segment) formed by concatenating a plurality of TBs, a combination of any two of the above, or a combination of all three, and may be specifically set according to a requirement.

The number of times of transmission of the multicast service data is used to indicate how many times the base station transmits each retransmission unit to the terminal on the transmission channel. The Transport Channel may be, for example, a Single Cell-Multicast Transport Channel (SC-MTCH).

It should be noted that, this embodiment does not limit the manner in which the base station acquires the transmission indication information of the multicast service. Optionally, if the transmission indication information of the multicast service may be determined by a base station, the base station may determine the transmission indication information of the multicast service according to a mapping relationship between a preset service type and the transmission indication information and a service type of the multicast service data.

The base station can also acquire the transmission indication information of the multicast service according to the related information of the multicast service data. The related information may be the data size of the multicast service data, the channel condition of the terminal involved in the multicast service data, the coverage level distribution of the user, and the like. For example: if the channel condition of the terminal involved in the multicast service data is better, and the coverage level of the user is mainly distributed on the better coverage level, the value of the transmission times in the transmission indication information of the multicast service is smaller. If the channel condition of the terminal related to the multicast service data is poor and the coverage level of the user is mainly distributed on the poor coverage level, the value of the transmission times in the transmission indication information of the multicast service is large. In a specific implementation, the base station may determine the channel condition and the transmission frequency, and/or the coverage level and the transmission frequency according to the historical multicast service data statistical data and/or the historical multicast service data empirical data. If the data volume of the multicast service data is small, the repeated transmission unit in the transmission indication information of the multicast service can be a transmission unit with small data volume; if the data size of the multicast service data is large, the retransmission unit in the transmission indication information of the multicast service may be a transmission unit with a large data size. Optionally, if the channel condition of the terminal related to the multicast service data is better, and the coverage level of the user is mainly distributed on the better coverage level, the repeated transmission unit in the transmission indication information of the multicast service may be a transmission unit with a smaller data size; if the channel condition of the terminal involved in the multicast service data is poor and the coverage level of the user is mainly distributed on the poor coverage level, the repeated transmission unit in the transmission indication information of the multicast service may be a transmission unit with a large data volume.

Optionally, if the transmission indication information of the multicast service may be determined by a core network device, the base station may obtain the transmission indication information of the multicast service and the like by receiving the transmission indication information of the multicast service sent by the core network device.

S103, the base station sends transmission indication information to the terminal.

Specifically, after acquiring the transmission indication information of the multicast service, the base station may send the transmission indication information to the terminal that receives the multicast service data, so that the terminal knows, through the transmission indication information, what kind of retransmission unit the base station will use to send the multicast service data to the terminal, and the base station will transmit the multicast service data several times when repeatedly transmitting each retransmission unit.

However, the present embodiment does not limit the manner in which the base station sends the transmission instruction information to the terminal. Optionally, the base station may send the transmission indication information to the terminal separately, or may send the transmission indication information to the terminal by carrying the transmission indication information in a control channel. The Control Channel may be, for example, a Multicast-service Control Channel (SC-MCCH), a Physical Downlink Control Channel (PDCCH), or a System Information Block (SIB).

Taking the example that the transmission indication information is carried in an SC-MCCH and sent to the terminal, in a specific implementation, the base station may carry the transmission indication information in an MTCH list on the SC-MCCH and send the MTCH list to the terminal, where the MTCH list carrying the transmission indication information may be as follows:

wherein, the repetionationfactor in the high-level signaling is the transmission times in the transmission indication information. The number of transmissions may be, for example, a positive integer between 1 and 8.

The repetitionmode in the higher layer signaling is a retransmission unit in the transmission indication information, for example, when a value of the repetitionmode is 1, the retransmission unit is TB, when the value of the repetitionmode is 2, the retransmission unit is entire Multicast service data (Multicast Session), and when the value of the repetitionmode is 3, the retransmission unit is a Segment (Segment) formed by concatenating a plurality of TBs.

The mbmsSessionInfo-r13 in the higher layer signaling indicates the identifier of the multicast service data being transmitted. g-RNTI-r13 in the above-mentioned higher layer signaling indicates an RNTI identifier used by the physical layer for scrambling multicast service data (SC-MTCH). Sc-mtch-scheduling info-r13 in the higher layer signaling indicates Discontinuous Reception (DRX) information related to multicast service data. Sc-mtch-neighbor cell-r13 in the higher layer signaling indicates the neighbor cell that is transmitting the multicast service data.

Optionally, the MTCH list may include two repetionationfactors, where one of the repetionation factors is used to indicate the transmission times in the transmission indication information of the multicast service according to the present invention, and the other is used to indicate the times of the physical layer transport block retransmission in the prior art, and the like.

Optionally, in another implementation manner of the present invention, all multicast service data (i.e., all MTCHs) indicated by the SC-MCCH may share the same transmission indication information, that is, the repeated transmission mode and the repeated transmission times of all multicast service data corresponding to the SC-MCCH are the same. In this case, the MTCH list in the SC-MCCH may be, for example, as follows:

wherein, the meaning of each feature in the code can be referred to the above explanation.

Optionally, the MCCH list may include two repetionationfactors, where one of the repetionationfactors is used to indicate the transmission times in the transmission indication information of the multicast service according to the present invention, and the other is used to indicate the times of repeated transmission of the physical layer transport block in the prior art, and the like.

Taking the transmission indication information carried in the SIB and sent to the terminal as an example, in a specific implementation, the SIB carrying the transmission indication information may be as follows:

optionally, the SIB may include two repetionationfactors, where one of the repetionationfactors is used to indicate the transmission frequency of the multicast service data, and the other is used to indicate the number of times of the physical layer transport block repeat transmission.

Taking the example that the repetition factor in the transmission indication Information is carried in the PDCCH and sent to the terminal, in a specific implementation, the base station may carry the repetition factor in the transmission indication Information in Downlink Control Information (DCI) of the PDCCH, and the like. The repetition factor here includes the above-mentioned two kinds of repetition factors, i.e., the repetition factor at the multicast service data level and the repetition factor at the physical transport block level.

And S104, the terminal receives the transmission indication information.

And S105, the base station transmits the multicast service data to the terminal according to the transmission instruction information.

Specifically, after the base station acquires the transmission indication information of the multicast service, the base station may repeatedly transmit the multicast service data to the terminal according to the transmission times included in the transmission indication information and the repeated transmission unit indicated by the multicast service data transmission mode, that is, the base station repeatedly transmits each repeated transmission unit to the terminal in sequence according to the transmission times. When the base station transmits each repeated transmission unit according to the transmission times, the data quantity included in the repeated transmission unit and the TB quantity mapped by the data quantity are the same, so that the base station can ensure that the repeated transmission is the same repeated transmission unit.

Specifically, when the base station transmits the multicast Service Data, a Radio Link Control (RLC) entity at a transmitter of the base station repeatedly transmits a Radio resource Link Control Service Data Unit (SDU) to the lower layer one or more times. Here, the lower layer may be a Media Access Control (MAC) layer in the LTE protocol; the number of repeated transmissions may be indicated by physical layer downlink control information indication or parameters in a system message (SIB), as described above. A radio resource link control entity at a transmitter of a base station processes a radio resource link control service Data Unit (RLC SDU) into a Protocol Data Unit (UMD PDU) of Unacknowledged Mode Data in the following manner:

step 1: a radio Resource Link Control (RLC) entity segments and/or reassembles RLC SDUs into one or more UMD PDUs such that the size of each UMD PDU fits into the size of an RLC PDU indicated by the medium access control layer.

Step 2: the RLC entity adds a corresponding RLC header to each UMD PDU.

Through the above steps, the RLC entity processes one or more radio resource link control service data units (RLC SDUs) into one or more radio resource link control protocol data units (RLC PDUs). In some embodiments, the RLC entity may transpose the above steps when processing RLC SDUs.

When one RLC SDU needs to be retransmitted, the RLC segments/reassembles the RLC SDU into one or more UMD PDUs according to the segmentation/reassembly mode when the RLC SDU is initially transmitted.

When each new UMD PDU is transmitted to the mac layer, the transmitter RLC entity needs to add sequence numbers to the UMD PDUs in sequence, and the specific operation mode is as follows:

step 1: setting a Sequence Number (SN) of the UMD PDU as a parameter VT (US), and adding one to the parameter VT (US);

step 2: storing the sequence number corresponding to each UMD PDU and the value of a corresponding parameter VT (US);

when the RLC entity repeatedly transmits one UMD PDU to the medium access control layer, the transmitter RLC entity needs to operate as follows:

the RLC entity sets the Sequence Number (SN) of the UMD PDU to a parameter vt (us) and the parameter vt (us) is incremented by one. Which is equal to the corresponding sequence number stored by the previous transmitter.

For the initial transmission and retransmission of each RLC SDU(s), the segmentation and/or reassembly mode of the RLC SDU is kept consistent, and the sequence number of each corresponding UMD PDU for initial transmission and retransmission is kept consistent.

And S106, the terminal receives the multicast service data transmitted by the base station according to the transmission indication information.

Specifically, after receiving the transmission indication information sent by the base station, the terminal can correctly receive the multicast service data repeatedly transmitted by the base station for multiple times according to the transmission times included in the transmission indication information and the repeat transmission unit indicated in the transmission mode when the base station transmits the multicast service data to the terminal, so that the situation that the terminal considers the multicast service data repeatedly transmitted by the base station as new multicast service data can be avoided.

In the multicast service transmission method provided in the embodiment of the present invention, after receiving multicast service data sent by a core network device, a base station may obtain a transmission mode including the multicast service data and transmission indication information of transmission times, so that the base station may transmit the multicast service data to a terminal for multiple times according to the transmission indication information, and simultaneously, the base station may also send the transmission indication information to the terminal, so that the terminal may correctly receive the multicast service data sent by the base station for multiple times according to the transmission indication information. Therefore, the multicast service transmission method provided by the embodiment of the invention can improve the probability of successfully receiving the multicast service data by the terminal and enhance the robustness of the multicast service by increasing the transmission times of the multicast service data when the data volume of the multicast service data is large.

Further, on the basis of the foregoing embodiment, the multicast service data received by the base station may include: a plurality of multicast service data units (i.e., PDCP SDU packets), each including at least one multicast service data packet. The multicast service data unit may be a minimum unit for the base station to split the multicast service data in the network layer. The multicast service data packet included in each multicast service data unit may be a TB, or may also be a segment, which may be specifically set according to the requirement of the user. Here, the segmentation may be a unit of one TB or more and one PDCP SDU packet or less, for example: 2 cascaded TBs, etc., which may be specifically determined by the base station and/or higher layer configuration.

In this embodiment, the number of the multicast service data units may be determined by the base station. In a specific implementation, the base station may determine the number of multicast service data units of the multicast service data according to a data volume carried by a preset multicast service data unit and a data volume of the multicast service data. Optionally, the base station may further determine the number of multicast service data units of the multicast service data according to a mapping relationship between a preset service type and a data amount carried by the multicast service data unit, and the service type of the multicast service data. Optionally, the base station may further determine the number of multicast service data units of the multicast service data according to a preset data volume of the multicast service data, a data volume carried by the multicast service data unit, and the data volume of the multicast service data, and may specifically determine according to a user requirement.

Further, on the basis of the foregoing embodiment, this embodiment relates to a specific process in which the base station transmits multicast service data to the terminal according to the transmission indication information. In this embodiment, the foregoing S105 may be specifically classified into the following cases:

in the first case: the transmission mode of the multicast service data is as follows: and the base station transmits the multicast service data to the terminal by taking all the data of the multicast service data as a repeated transmission unit. The above S105 may include: and the base station repeatedly transmits the multicast service data to the terminal by taking all the data of the multicast service data as a repeated transmission unit according to the transmission times.

Specifically, when the base station repeatedly transmits the multicast service data to the terminal according to the transmission mode in which all the data of the multicast service data are used as the repeat transmission unit, the base station may repeatedly transmit the multicast service data to the terminal by using all the data of the multicast service data as the repeat transmission unit, that is, after the base station has transmitted all the data of the multicast service data to the terminal, all the data of the multicast service data are retransmitted to the terminal again, and the repetition is performed until the transmission frequency is reached. Accordingly, after receiving the transmission indication information including the transmission mode of the multicast service data sent by the base station, the terminal may learn from the transmission mode, and may receive the multicast service data transmitted by the base station with all data of the multicast service data as a repeat transmission unit. Therefore, when receiving the multicast service data transmitted by the base station according to the transmission indication information, the terminal can receive the multicast service data repeatedly transmitted by the base station by taking all the data of the multicast service data as a repeated transmission unit according to the transmission times.

Fig. 2 is a schematic diagram of multicast service data according to an embodiment of the present invention, as shown in fig. 2, taking an example that the multicast service data includes N multicast service data units (i.e., PDCP SDUs), and each multicast service data unit includes k multicast service data packets (in this example, a multicast service data packet is TB), assuming that a transmission mode of the multicast service data included in the transmission indication information is: and the base station transmits the multicast service data to the terminal by taking all the data of the multicast service data as a repeated transmission unit, wherein the transmission times are 4. The specific way for the base station to transmit the multicast service data to the terminal according to the transmission indication information may be: and the base station sequentially transmits all TBs of the multicast service data to the terminal according to the sequence of each PDCP SDU of the multicast service data and the sequence of the TBs in each PDCP SDU, and then sequentially transmits all the TBs of the multicast service data to the terminal again according to the sequence of each PDCP SDU of the multicast service data and the sequence of the TBs in each PDCP SDU until the transmission times reach 4 times. Accordingly, when receiving the multicast service data according to the transmission indication information, the terminal can receive all the data of the multicast service data as a repeated transmission unit without distinguishing which data is the repeated transmission data, thereby ensuring that the terminal can correctly receive the multicast service data which is transmitted for multiple times when the base station transmits the same multicast service data to the terminal for multiple times.

In the second case: the transmission mode of the multicast service data is as follows: and the base station transmits the multicast service data to the terminal by taking the multicast service data unit as a repeated transmission unit. The above S105 may include: and the base station repeatedly transmits the multicast service data to the terminal by taking the multicast service data unit as a repeated transmission unit according to the transmission times.

Specifically, when the base station repeatedly transmits the multicast service data to the terminal according to the transmission mode in which the multicast service data unit is used as the repeat transmission unit to transmit the multicast service data to the terminal, the base station may repeatedly transmit the multicast service data to the terminal by using the multicast service data unit of the multicast service data as the repeat transmission unit. That is, after the base station has transmitted one multicast service data unit of the multicast service data to the terminal, the base station will repeatedly transmit the multicast service data unit to the terminal until the transmission times are reached, and then the base station continues to transmit the next multicast service data unit of the multicast service data to the terminal in this way until all multicast service data units of the multicast service data are transmitted to the terminal. Accordingly, after receiving the transmission indication information including the transmission mode of the multicast service data sent by the base station, the terminal may learn from the transmission mode, and may receive the multicast service data transmitted by the base station with the multicast service data unit as a repeat transmission unit. Therefore, when receiving the multicast service data transmitted by the base station according to the transmission indication information, the terminal can receive the multicast service data repeatedly transmitted by the base station by taking the multicast service data unit as a repeated transmission unit according to the transmission times.

Fig. 3 is a schematic diagram of another multicast service data according to an embodiment of the present invention, as shown in fig. 3, fig. 3 shows one multicast service data unit PDCP SDU1 of the multicast service data, and assuming that the multicast service data unit includes k multicast service data packets (in this example, the multicast service data packet is TB), when a transmission mode of the multicast service data included in the transmission indication information is: the base station transmits the multicast service data to the terminal by using the multicast service data unit as a repeat transmission unit, and when the transmission times is 4 times, the base station may specifically transmit the multicast service data to the terminal according to the transmission indication information: after the base station sequentially transmits the TBs 1-TBk of the multicast service data unit to the terminal according to the sequence of each TB of the multicast service data unit, sequentially transmits the TBs 1-TBk of the multicast service data unit to the terminal again according to the sequence of each TB of the multicast service data unit until the transmission times reach 4 times, and the base station continues to transmit the next multicast service data unit of the multicast service data to the terminal in this way. Accordingly, when receiving the multicast service data according to the transmission indication information, the terminal can receive the multicast service data by taking the multicast service unit as a repeated transmission unit without data which can not be distinguished from which multicast service data unit is currently transmitted, thereby ensuring that the terminal can correctly receive the multicast service data when the base station transmits the same multicast service data to the terminal for multiple times.

In the third case: the transmission mode of the multicast service data is as follows: and the base station transmits the multicast service data to the terminal by taking the multicast service data packet as a repeated transmission unit. The above S105 may include: and the base station repeatedly transmits the multicast service data to the terminal by taking the multicast service data packet as a repeated transmission unit according to the transmission times.

Specifically, when the base station repeatedly transmits the multicast service data to the terminal according to the transmission mode in which the multicast service data packet is used as the repeat transmission unit, the base station may repeatedly transmit the multicast service data to the terminal by using the multicast service data packet of the multicast service data as the repeat transmission unit. That is, after the base station has transmitted one multicast service data packet of the multicast service data to the terminal, the base station will repeatedly transmit the multicast service data packet to the terminal until the transmission frequency is reached, and then the base station continues to transmit the next multicast service data packet of the multicast service data to the terminal in this way until all multicast service data packets of the multicast service data are transmitted to the terminal. Accordingly, after receiving the transmission indication information including the transmission mode of the multicast service data sent by the base station, the terminal may learn from the transmission mode, and may receive the multicast service data transmitted by the base station by using the multicast service data packet as a repeat transmission unit. Therefore, when receiving the multicast service data transmitted by the base station according to the transmission indication information, the terminal can receive the multicast service data repeatedly transmitted by the base station by taking the multicast service data packet as a repeated transmission unit according to the transmission times.

Taking the above-mentioned multicast data packet as an example TB, fig. 4 is a schematic diagram of another multicast service data provided by the embodiment of the present invention, as shown in fig. 4, fig. 4 shows one multicast service data unit PDCP SDU1 of the multicast service data, and assuming that the multicast service data unit includes k multicast service data packets (in this example, the multicast service data packet is TB), when the transmission mode of the multicast service data included in the transmission indication information is: the base station transmits the multicast service data to the terminal by using the multicast service data packet as a repeat transmission unit, and when the number of repeat transmissions is 3, the base station may specifically transmit the multicast service data to the terminal according to the transmission indication information: after the base station transmits the TB1 of the multicast service data unit to the terminal according to the sequence of each TB of the multicast service data unit, the base station repeatedly transmits the TB1 to the terminal until the number of times of repeated transmission reaches 3 times, and the base station will continue to transmit the next multicast service data packet of the multicast service data unit, that is, TB2, to the terminal in this way until the last multicast service data packet of the last multicast service data unit is transmitted to the terminal. Accordingly, when receiving the multicast service data according to the transmission indication information, the terminal can receive the multicast service data packet as a repeat transmission unit without distinguishing which data is the repeat transmission data, thereby ensuring that the terminal can correctly receive the multicast service data which is transmitted for a plurality of times when the base station transmits the same multicast service data to the terminal for a plurality of times.

When the terminal receives the multicast data, the way of processing RLC PDU by the Radio Link Control (RLC) entity at the receiver end is consistent with the UM mode in the LTE, and will not be described here.

In the multicast service transmission method provided in the embodiment of the present invention, after the base station acquires the transmission mode including the multicast service data and the transmission indication information of the transmission times, the base station may transmit the multicast service data to the terminal for multiple times according to the transmission indication information, and simultaneously, the base station may also transmit the transmission indication information to the terminal, so that the terminal may correctly receive the multicast service data sent by the base station for multiple times according to the transmission indication information without distinguishing which data is repeatedly transmitted. Therefore, the multicast service transmission method provided by the embodiment of the invention ensures that the terminal can correctly receive the multicast service data which is transmitted for multiple times on the basis of realizing the multiple transmission of the same multicast service data to the terminal, improves the probability of successfully receiving the multicast service data by the terminal, and enhances the robustness of the multicast service.

Fig. 5 is a signaling interaction flowchart of another multicast service transmission method according to an embodiment of the present invention. The second embodiment relates to a specific process in which the base station sends the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information. As shown in fig. 5, S105 and S106 may be replaced by the following steps, specifically:

s201, the base station sends the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information.

Specifically, in this embodiment, before the base station sends the multicast service data to the terminal according to the transmission indication information, the base station may further generate, for each multicast service data packet of the multicast service data, first indication information corresponding to the multicast service data packet according to the number of the multicast service data packets. The first indication information is used to indicate an identifier of a multicast service data packet, so that when the terminal receives the multicast service data packet, the terminal can know which multicast service data packet the currently received multicast service data packet is according to the first indication information.

The identifier of the multicast service data packet may be allocated by the base station, and in a specific implementation, if the transmission mode of the multicast service data is: the base station transmits the multicast service data to the terminal by taking all the multicast service data as a repeated transmission unit, and then the base station can allocate a number to each multicast service data packet as an identifier of the multicast service data packet according to the number of all the multicast service data packets of the multicast service data and the sequence of the multicast service data packets of the multicast service data in a physical layer, and generate first indication information for the multicast service data packet according to the identifier of the multicast service data packet, so that when the terminal receives the multicast service data packet, the terminal can determine which multicast service data packet in the multicast service data is received according to the first indication information.

If the transmission mode of the multicast service data is as follows: the base station transmits the multicast service data to the terminal by taking the multicast service data unit as a repeated transmission unit, the base station can allocate a number to each multicast service data packet as an identifier of the multicast service data packet according to the number of all multicast service data packets of the multicast service data and the sequence of the multicast service data packets of the multicast service data in a physical layer, and also allocate a number to each multicast service data packet of the multicast service data unit as an identifier of the multicast service data packet according to the number of all multicast service data packets of each multicast service data unit and the sequence of each multicast service data packet in the multicast service data unit in the physical layer, and generate first indication information for the multicast service data packet according to the identifier of the multicast service data packet, so that when the terminal receives the multicast service data packet, it may be determined which multicast service data packet in the multicast service data unit is received according to the first indication information.

Optionally, if the multicast service data packet is a TB, the first indication information is used to indicate an identifier of the TB. If the multicast service data packet is a segment and the segment includes a plurality of TBs, all the TBs in the segment correspond to the same first indication information, that is, the identifiers of all the TBs in the segment are the same. When the multicast service data packet is a segment and the segment is equal to a multicast service data unit, that is, when the multicast service data packet is a multicast service data unit, all TBs in the multicast service data unit correspond to the same first indication information, that is, the identifiers of all TBs in the segment are the same.

In this way, after the base station generates the first indication information corresponding to the multicast service data packet for each multicast service data packet of the multicast service data, the base station may transmit the first indication information of the multicast service data packet to the terminal according to the transmission indication information when transmitting each multicast service data packet of the multicast service data. It should be noted that, although the base station sends the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information, the base station is not limited that the retransmission unit in the transmission mode in the transmission indication information is the multicast service data packet, may be all data of the multicast service data, or may be a multicast service data unit (i.e., one PDCP SDU) of the multicast service data.

The embodiment does not limit the manner in which the base station sends the first indication information to the terminal. Optionally, the base station may send the first indication information to the terminal separately, or may send the first indication information to the terminal by carrying it in a control channel. The control channel may be, for example, PDCCH. Taking the example that the first indication Information is carried in the PDCCH and sent to the terminal, in a specific implementation, the base station may send the first indication Information to the terminal and the like, where the first indication Information is carried in Downlink Control Information (DCI) of the PDCCH.

S202, the terminal receives first indication information sent by the base station according to the transmission indication information.

S203, the terminal determines whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received according to the first indication information.

Specifically, in this embodiment, the terminal may determine, according to the first indication information, whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received by the terminal, if so, the terminal does not need to receive the multicast service data packet again, and if not, the terminal continues to receive, according to the transmission indication information, the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

Meanwhile, because different terminals may not receive the successfully multicast service data packets under different channel conditions, by sending the first indication information to indicate each multicast service data packet to the terminal, each terminal involved in the multicast service data can use the first indication information to judge whether the terminal has successfully received the multicast service data packet corresponding to the first indication information. Therefore, on the premise of ensuring that all terminals related to the multicast service data can successfully receive the multicast service data, the overhead of all terminals related to the multicast service data is reduced.

Specifically, when the foregoing S203 is implemented, the terminal may determine whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received by determining whether the identifier of the recorded multicast service data packet includes the identifier of the multicast service data packet. If so, it is determined that the multicast service data packet corresponding to the multicast service data packet identifier has been successfully received, and the terminal may ignore the multicast service data packet transmitted by the base station and does not perform any processing. If not, determining that the multicast service data packet corresponding to the identifier of the multicast service data packet is not successfully received, and continuing to execute S204.

S204, when the terminal determines that the multicast service data packet indicated by the identifier of the multicast service data packet is not successfully received, the terminal continues to receive the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station according to the transmission indication information.

Specifically, if the terminal determines that the multicast service data packet corresponding to the identifier of the multicast service data packet is not successfully received according to the first indication information, the terminal may continue to receive the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station according to the transmission indication information. How the terminal receives the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station according to the transmission indication information may specifically refer to the above embodiments, which is not described herein again.

Optionally, after the step S204, the method may further include: if the terminal determines that the multicast service data packet can be successfully analyzed after continuously receiving the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station, that is, when it is determined that the multicast service data packet corresponding to the identifier of the multicast service data packet is successfully received, the terminal can record the identifier of the multicast service data packet, so that when the base station multicasts the multicast service data packet again, the terminal can determine that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received through the identifier of the multicast service data packet recorded by the terminal, that is, the terminal can ignore the multicast service data packet transmitted by the base station and does not perform any processing, thereby reducing the overhead of the terminal.

In the multicast service transmission method provided in the embodiment of the present invention, the base station may generate, for each multicast service data packet, first indication information for indicating an identifier of the multicast service data packet, and when transmitting multicast service data to the terminal according to the transmission indication information, send the first indication information to the terminal along with the multicast service data packet, so that the terminal may determine whether the multicast service data packet has been successfully received according to the first indication information, and when determining that the multicast service data packet has not been successfully received, may continue to receive the multicast service data packet sent by the base station, and when determining that the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received, the terminal may ignore the multicast service data packet transmitted by the base station, and does not perform any processing. By the method, the terminal can be prevented from repeatedly receiving the successfully received multicast service data packet, and the expense of the terminal is reduced.

Fig. 6 is a signaling interaction flow chart of a third embodiment of a multicast service transmission method according to an embodiment of the present invention. The third embodiment relates to a specific process of the base station sending the multicast service notification information to the terminal. As shown in fig. 6, the method may further include:

s301, the base station sends the multicast service notification information to the terminal.

The multicast service notification information is used for indicating the number of multicast service data packets of the multicast service data to the terminal.

Specifically, in this embodiment, before the base station transmits the multicast service data to the terminal according to the transmission indication information, the base station may further send multicast service notification information to the terminal to indicate the number of multicast service data packets of the multicast service data.

However, the present embodiment does not limit the manner in which the base station transmits the multicast service notification information to the terminal. Optionally, the base station may send the multicast service notification information to the terminal separately, and may also send the multicast service notification information to the terminal by being carried in a control channel. The control channel may be, for example, SC-MCCH or PDCCH. Taking the example that the transmission indication information is carried in the PDCCH and transmitted to the terminal, in a specific implementation, the base station may carry the transmission indication information in the DCI of the PDCCH and transmit the DCI to the terminal.

Taking the example that the multicast service notification information is carried in the SC-MCCH and sent to the terminal, in a specific implementation, the base station may carry the multicast service notification information in the MTCH list on the SC-MCCH and send the MTCH list to the terminal. With continuing reference to the MTCH list of the SC-MCCH indicated in S103, in the code of the MTCH list, the segmentnumber indicates the number of multicast data packets included in the multicast service data, and the number of multicast service data packets of the multicast service data can be indicated to the terminal through the parameter of the segmentnumber. Optionally, the MTCH may further include: the multicast service data includes a pdcsdumbersize for indicating the number of multicast service data units (i.e., PDCP SDUs) included in the multicast service data, a pdcpsmize for indicating the number of transport blocks included in one multicast service data packet PDCP SDU, and a segmentsize for indicating the number of transport blocks included in one multicast service data packet.

S302, the terminal receives the multicast service notification information.

Specifically, after receiving the multicast service notification information, the terminal can determine whether all multicast service data packets of the multicast service data have been received according to the number of the multicast service data packets successfully received by the terminal, and thus, the terminal can be ensured to correctly and completely receive the multicast service data by this way, the probability of successfully receiving the multicast service data by the terminal is improved, and the robustness of the multicast service is enhanced.

Optionally, in another implementation manner of the present invention, the multicast service notification information may further include: the number of the TBs in each multicast service data packet enables the terminal to determine whether each multicast service data packet of the multicast service data has been received according to the number of the TBs in the multicast service data packet successfully received by the terminal, and thus the terminal can be ensured to correctly and completely receive the multicast service data by this way, the probability of successfully receiving the multicast service data by the terminal is further improved, and the robustness of the multicast service is further enhanced.

In the multicast service transmission method provided by the embodiment of the present invention, the base station may send the multicast service notification information to the terminal, so that after receiving the multicast service notification information, the terminal may determine whether all multicast service data packets of the multicast service data have been received according to the number of the multicast service data packets successfully received by the terminal, and thus, the terminal may be ensured to correctly and completely receive the multicast service data by this way, the probability of successfully receiving the multicast service data by the terminal is improved, and the robustness of the multicast service is enhanced.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 7, the base station may include: a receiver 11, a processor 12 and a transmitter 13; wherein the content of the first and second substances,

a receiver 11, configured to receive multicast service data sent by a core network device;

a processor 12, configured to acquire transmission indication information of a multicast service; the transmission indication information includes: the transmission mode of the multicast service data and the transmission times; optionally, the processor 12 may determine the transmission indication information of the multicast service according to the service type of the multicast service data and a mapping relationship between a preset service type and the transmission indication information, and may further control the receiver 11 to receive the transmission indication information of the multicast service sent by the core network device.

And a transmitter 13, configured to send the transmission indication information to the terminal, and transmit the multicast service data to the terminal according to the transmission indication information.

The base station provided in the embodiment of the present invention may be configured to execute the steps executed by the base station in the method embodiment shown in fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.

Optionally, in an implementation manner of the present invention, the multicast service data includes: a plurality of multicast service data units, each multicast service data unit comprising at least one multicast service data packet; the number of the multicast service data units included in the multicast service data is determined by the base station.

Then, in this implementation, the transmission mode of the multicast service data is: in the case of transmitting the multicast service data to the terminal by using all the data of the multicast service data as the retransmission unit, the transmitter 13 is specifically configured to repeatedly transmit the multicast service data to the terminal by using all the data of the multicast service data as the retransmission unit according to the transmission times. The transmission mode of the multicast service data is as follows: in the case of transmitting the multicast service data to the terminal by using the multicast service data unit as the retransmission unit, the transmitter 13 is specifically configured to repeatedly transmit the multicast service data to the terminal by using the multicast service data unit as the retransmission unit according to the transmission times. The transmission mode of the multicast service data is as follows: in the case of transmitting the multicast service data to the terminal by using the multicast service data packet as the retransmission unit, the transmitter 13 is specifically configured to repeatedly transmit the multicast service data to the terminal by using the multicast service data packet as the retransmission unit according to the transmission times.

Optionally, in another implementation manner of the present invention, the transmitter 13 may be further configured to send multicast service notification information to the terminal, where the multicast service notification information is used to indicate the number of multicast service data packets of the multicast service data to the terminal.

The base station provided in the embodiment of the present invention may be configured to execute the steps executed by the base station in the method embodiment shown in fig. 6, and the implementation principle and the technical effect are similar, which are not described herein again.

The processor 12 is further configured to generate first indication information for the multicast service data packet of the multicast service data according to the number of the multicast service data packets before the transmitter 13 sends the multicast service data to the terminal according to the transmission indication information, where the first indication information is used to indicate an identifier of the multicast service data packet to the terminal;

in this case, the transmitter 13 may be specifically configured to send the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information.

The base station provided in the embodiment of the present invention may be configured to execute the steps executed by the base station in the method embodiment shown in fig. 5, and the implementation principle and the technical effect are similar, which are not described herein again.

Fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 8, the terminal may include: a receiver 21 and a processor 22; wherein the content of the first and second substances,

a receiver 21, configured to receive transmission indication information sent by a base station;

a processor 22, configured to control the receiver 21 to receive the multicast service data transmitted by the base station according to the transmission indication information; the transmission indication information includes: the transmission mode of the multicast service data, and the transmission times.

The terminal provided in the embodiment of the present invention may be configured to execute the steps executed by the terminal in the method embodiment shown in fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.

Optionally, in an implementation manner of the present invention, the multicast service data may include: a plurality of multicast service data units, each multicast service data unit comprising at least one multicast service data packet; the number of the multicast service data units included in the multicast service data is determined by the base station.

Then, in this implementation, the transmission mode of the multicast service data is: in the case of receiving the multicast service data transmitted by the base station by using all the data of the multicast service data as the retransmission unit, the processor 22 may be specifically configured to control the receiver 21 to receive the multicast service data repeatedly transmitted by the base station by using all the data of the multicast service data as the retransmission unit according to the transmission times. The transmission mode of the multicast service data is as follows: in the case of receiving the multicast service data transmitted by the base station by using the multicast service data unit as the retransmission unit, the processor 22 may be specifically configured to control the receiver 21 to receive the multicast service data repeatedly transmitted by the base station by using the multicast service data unit as the retransmission unit according to the transmission times. The transmission mode of the multicast service data is as follows: in the case of receiving the multicast service data transmitted by the base station by using the multicast service data packet as the retransmission unit, the processor 22 may be specifically configured to control the receiver to receive the multicast service data repeatedly transmitted by the base station by using the multicast service data packet as the retransmission unit according to the transmission times.

Optionally, in another implementation manner of the present invention, the receiver 21 is further configured to receive multicast service notification information sent by the base station, where the multicast service notification information is used to indicate the number of multicast service data packets of multicast service data.

The terminal provided in the embodiment of the present invention may be configured to execute the steps executed by the terminal in the method embodiment shown in fig. 6, and the implementation principle and the technical effect are similar, which are not described herein again.

The processor 22 is specifically configured to control the receiver 21 to receive the first indication information sent by the base station according to the transmission indication information, determine whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received according to the first indication information, and control the receiver 21 to continue to receive the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station according to the transmission indication information when it is determined that the multicast service data packet indicated by the identifier of the multicast service data packet has not been successfully received; the first indication information is used for indicating the identifier of the multicast service data packet; the first indication information is indication information generated for the multicast service data packet of the multicast service data by the base station according to the number of the multicast service data packets.

The terminal provided in the embodiment of the present invention may be configured to execute the steps executed by the terminal in the method embodiment shown in fig. 5, and the implementation principle and the technical effect are similar, which are not described herein again.

Further, the processor 22 is further configured to record the identifier of the multicast service data packet when it is determined that the multicast service data packet corresponding to the identifier of the multicast service data packet is successfully received after the control receiver 21 continues to receive the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station.

Optionally, the processor 22 may be specifically configured to determine whether the identifier of the recorded multicast service data packet includes an identifier of the multicast service data packet, and determine that the multicast service data packet corresponding to the identifier of the multicast service data packet is not successfully received when it is determined that the identifier of the recorded multicast service data packet does not include the identifier of the multicast service data packet.

As described in the foregoing embodiment, the terminal according to the embodiment of the present invention may be a wireless terminal such as a mobile phone and a tablet computer, and therefore, taking the terminal as a mobile phone as an example: fig. 9 is a block diagram of a structure of a terminal in the case where the terminal is a mobile phone according to the embodiment of the present invention. Referring to fig. 9, the mobile phone may include: radio Frequency (RF) circuitry 1110, memory 1120, input unit 1130, display unit 1140, sensors 1150, audio circuitry 1160, wireless fidelity (WiFi) module 1170, processor 1180, and power supply 1190. Those skilled in the art will appreciate that the handset configuration shown in fig. 9 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The following describes each component of the mobile phone in detail with reference to fig. 9:

RF circuit 1110 may be used for receiving and transmitting signals during a message transmission or call, and in particular, for receiving downlink messages from a base station and then processing the received downlink messages to processor 1180; in addition, the uplink data is transmitted to the base station. Typically, the RF circuitry includes, but is not limited to, an antenna, at least one Amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 1110 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to Global System for Mobile communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE)), e-mail, Short Messaging Service (SMS), and the like.

The memory 1120 may be used to store software programs and modules, and the processor 1180 may execute various functional applications and data processing of the mobile phone by operating the software programs and modules stored in the memory 1120. The memory 1120 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 1120 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 1130 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the cellular phone. Specifically, the input unit 1130 may include a touch panel 1131 and other input devices 1132. Touch panel 1131, also referred to as a touch screen, can collect touch operations of a user on or near the touch panel 1131 (for example, operations of the user on or near touch panel 1131 by using any suitable object or accessory such as a finger or a stylus pen), and drive corresponding connection devices according to a preset program. Alternatively, the touch panel 1131 may include two parts, namely, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 1180, and can receive and execute commands sent by the processor 1180. In addition, the touch panel 1131 can be implemented by using various types, such as resistive, capacitive, infrared, and surface acoustic wave. The input unit 1130 may include other input devices 1132 in addition to the touch panel 1131. In particular, other input devices 1132 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The display unit 1140 may be used to display information input by the user or information provided to the user and various menus of the cellular phone. The Display unit 1140 may include a Display panel 1141, and optionally, the Display panel 1141 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like. Further, touch panel 1131 can be overlaid on display panel 1141, and when touch operation is detected on or near touch panel 1131, the touch operation is transmitted to processor 1180 to determine the type of touch event, and then processor 1180 provides corresponding visual output on display panel 1141 according to the type of touch event. Although in fig. 9, the touch panel 1131 and the display panel 1141 are two independent components to implement the input and output functions of the mobile phone, in some embodiments, the touch panel 1131 and the display panel 1141 may be integrated to implement the input and output functions of the mobile phone.

The handset may also include at least one sensor 1150, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 1141 according to the brightness of ambient light, and the light sensor may turn off the display panel 1141 and/or the backlight when the mobile phone moves to the ear. As one type of motion sensor, the acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.

Audio circuitry 1160, speaker 1161, and microphone 1162 may provide an audio interface between a user and a cell phone. The audio circuit 1160 may transmit the electrical signal converted from the received audio data to the speaker 1161, and convert the electrical signal into a sound signal for output by the speaker 1161; on the other hand, the microphone 1162 converts the collected sound signals into electrical signals, which are received by the audio circuit 1160 and converted into audio data, which are then processed by the audio data output processor 1180, and then transmitted to, for example, another cellular phone via the RF circuit 1110, or output to the memory 1120 for further processing.

WiFi belongs to short-distance wireless transmission technology, and the cell phone can help a user to receive and send e-mails, browse webpages, access streaming media and the like through the WiFi module 1170, and provides wireless broadband internet access for the user. Although fig. 9 shows the WiFi module 1170, it is understood that it does not belong to the essential constitution of the handset, and can be omitted entirely as needed within the scope not changing the essence of the invention.

The processor 1180 is a control center of the mobile phone, and is connected to various parts of the whole mobile phone through various interfaces and lines, and executes various functions of the mobile phone and processes data by operating or executing software programs and/or modules stored in the memory 1120 and calling data stored in the memory 1120, thereby performing overall monitoring of the mobile phone. Optionally, processor 1180 may include one or more processing units; preferably, the processor 1180 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated within processor 1180.

The phone also includes a power supply 1190 (e.g., a battery) for powering the various components, and preferably, the power supply may be logically connected to the processor 1180 via a power management system, so that the power management system may manage charging, discharging, and power consumption management functions.

The mobile phone may further include a camera 1200, which may be a front camera or a rear camera. Although not shown, the mobile phone may further include a bluetooth module, a GPS module, etc., which will not be described herein.

In the embodiment of the present invention, the processor 1180 included in the mobile phone may be configured to execute the foregoing multicast service transmission method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again.

Another aspect of the embodiments of the present invention further provides a communication system, where the communication system may include the base station provided in fig. 7 and the terminal provided in fig. 8, where the base station may be configured to execute the steps executed by the base station in the method embodiments shown in fig. 1, 5, and 6, and the terminal may be configured to execute the steps executed by the terminal in the method embodiments shown in fig. 1, 5, and 6, which are similar in implementation principle and technical effect and are not described herein again.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for transmitting multicast service, which is applied in a base station, the method comprising:

receiving multicast service data sent by core network equipment, wherein the multicast service data comprises: a plurality of multicast service data units, each of which comprises at least one multicast service data packet;

acquiring transmission indication information of a multicast service, wherein the transmission indication information comprises: a transmission mode of the multicast service data and a transmission frequency, wherein the transmission mode is used for indicating a repeated transmission unit of the multicast service data; and sending the transmission indication information to a terminal, and transmitting the multicast service data to the terminal according to the transmission indication information.

2. The method of claim 1, wherein the transmission mode of the multicast service data is: transmitting the multicast service data to the terminal by taking all the data of the multicast service data as a repeated transmission unit; the transmitting the multicast service data to the terminal according to the transmission indication information includes:

and according to the transmission times, repeatedly transmitting the multicast service data to the terminal by taking all the data of the multicast service data as a repeated transmission unit.

3. The method of claim 1, wherein the transmission mode of the multicast service data is: transmitting the multicast service data to the terminal by taking the multicast service data unit as a repeated transmission unit;

the transmitting the multicast service data to the terminal according to the transmission indication information includes:

and according to the transmission times, taking the multicast service data unit as a repeated transmission unit, and repeatedly transmitting the multicast service data to the terminal.

4. The method of claim 1, wherein the transmission mode of the multicast service data is: transmitting the multicast service data to the terminal by taking the multicast service data packet as a repeated transmission unit;

and according to the transmission times, taking the multicast service data packet as a repeated transmission unit, and repeatedly transmitting the multicast service data to the terminal.

5. The method of claim 1, further comprising:

and sending multicast service notification information to the terminal, wherein the multicast service notification information is used for indicating the number of multicast service data packets of the multicast service data to the terminal.

6. The method of claim 5, wherein before the sending the multicast service data to the terminal according to the transmission indication information, further comprising:

generating first indication information for the multicast service data packet of the multicast service data according to the number of the multicast service data packets, wherein the first indication information is used for indicating the identifier of the multicast service data packet to the terminal;

the sending the multicast service data to the terminal according to the transmission indication information includes:

and sending the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information.

7. A method for transmitting multicast service is applied to a terminal, and the method comprises the following steps:

receiving transmission indication information sent by a base station; the transmission indication information includes: the transmission mode of the multicast service data and the transmission times are used for indicating the repeated transmission unit of the multicast service data;

receiving the multicast service data transmitted by the base station according to the transmission indication information, wherein the multicast service data comprises: the system comprises a plurality of multicast service data units, wherein each multicast service data unit comprises at least one multicast service data packet.

8. The method of claim 7, wherein the transmission mode of the multicast service data is: receiving the multicast service data transmitted by the base station by taking all data of the multicast service data as a repeated transmission unit; the receiving the multicast service data transmitted by the base station according to the transmission indication information includes:

and receiving the multicast service data repeatedly transmitted by the base station by taking all the data of the multicast service data as a repeated transmission unit according to the transmission times.

9. The method of claim 7, wherein the transmission mode of the multicast service data is: receiving the multicast service data transmitted by the base station by taking the multicast service data unit as a repeated transmission unit;

the receiving the multicast service data transmitted by the base station according to the transmission indication information includes:

and receiving the multicast service data repeatedly transmitted by the base station by taking the multicast service data unit as a repeated transmission unit according to the transmission times.

10. The method of claim 7, wherein the transmission mode of the multicast service data is: receiving the multicast service data transmitted by the base station by taking the multicast service data packet as a repeated transmission unit;

and receiving the multicast service data repeatedly transmitted by the base station by taking the multicast service data packet as a repeated transmission unit according to the transmission times.

11. The method of claim 7, further comprising:

and receiving multicast service notification information sent by the base station, wherein the multicast service notification information is used for indicating the number of multicast service data packets of the multicast service data.

12. The method of claim 11, wherein the receiving the multicast service data transmitted by the base station according to the transmission indication information comprises:

receiving first indication information sent by the base station according to the transmission indication information, wherein the first indication information is used for indicating the identifier of the multicast service data packet; the first indication information is indication information generated by the base station for the multicast service data packet of the multicast service data according to the number of the multicast service data packets;

determining whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received or not according to the first indication information;

and when the multicast service data packet indicated by the identifier of the multicast service data packet is determined to be unsuccessfully received, continuously receiving the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station according to the transmission indication information.

13. The method of claim 12, wherein after the continuing to receive the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station, the method further comprises:

and recording the identifier of the multicast service data packet when the multicast service data packet corresponding to the identifier of the multicast service data packet is successfully received.

14. The method of claim 12, wherein the determining, according to the first indication information, whether the multicast service data packet corresponding to the identifier of the multicast service data packet has been successfully received comprises:

judging whether the recorded identification of the multicast service data packet contains the identification of the multicast service data packet, and if the recorded identification of the multicast service data packet does not contain the identification of the multicast service data packet, determining that the multicast service data packet corresponding to the identification of the multicast service data packet is not successfully received.

15. A base station, characterized in that the base station comprises:

a receiver, configured to receive multicast service data sent by a core network device, where the multicast service data includes: a plurality of multicast service data units, each of which comprises at least one multicast service data packet;

the processor is used for acquiring the transmission indication information of the multicast service; the transmission indication information includes: a transmission mode of the multicast service data and a transmission frequency, wherein the transmission mode is used for indicating a repeated transmission unit of the multicast service data;

and the transmitter is used for sending the transmission indication information to a terminal and transmitting the multicast service data to the terminal according to the transmission indication information.

16. The base station of claim 15, wherein the transmission mode of the multicast service data is: and in the case that the multicast service data is transmitted to the terminal with all the data of the multicast service data as a retransmission unit, the transmitter is specifically configured to repeatedly transmit the multicast service data to the terminal with all the data of the multicast service data as the retransmission unit according to the transmission times.

17. The base station of claim 15, wherein the transmission mode of the multicast service data is: and under the condition that the multicast service data unit is used as a repeat transmission unit to transmit the multicast service data to the terminal, the transmitter is specifically used for repeatedly transmitting the multicast service data to the terminal according to the transmission times by using the multicast service data unit as a repeat transmission unit.

18. The base station of claim 15, wherein the transmission mode of the multicast service data is: and under the condition that the multicast service data is transmitted to the terminal by taking the multicast service data packet as a repeat transmission unit, the transmitter is specifically configured to repeat transmission of the multicast service data to the terminal by taking the multicast service data packet as a repeat transmission unit according to the transmission times.

19. The base station of claim 15, wherein the transmitter is further configured to send multicast service notification information to the terminal, and wherein the multicast service notification information is used to indicate the number of multicast service data packets of the multicast service data to the terminal.

20. The base station of claim 19,

the processor is further configured to generate first indication information for a multicast service data packet of the multicast service data according to the number of the multicast service data packets before the transmitter sends the multicast service data to the terminal according to the transmission indication information, where the first indication information is used to indicate an identifier of the multicast service data packet to the terminal;

the transmitter is specifically configured to send the first indication information and the multicast service data packet indicated by the first indication information to the terminal according to the transmission indication information.

21. A terminal, characterized in that the terminal comprises:

the receiver is used for receiving the transmission indication information sent by the base station;

a processor, configured to control the receiver to receive the multicast service data transmitted by the base station according to the transmission indication information; the transmission indication information includes: a transmission mode of the multicast service data, and a transmission frequency, where the transmission mode is used to indicate a repeat transmission unit of the multicast service data, and the multicast service data includes: the system comprises a plurality of multicast service data units, wherein each multicast service data unit comprises at least one multicast service data packet.

22. The terminal of claim 21, wherein a transmission mode of the multicast service data is: and in the case that all the data of the multicast service data are used as the retransmission unit to receive the multicast service data transmitted by the base station, the processor is specifically configured to control the receiver to receive the multicast service data repeatedly transmitted by the base station according to the transmission times and with all the data of the multicast service data as the retransmission unit.

23. The terminal of claim 21, wherein a transmission mode of the multicast service data is: and in the case that the multicast service data unit is used as a repeat transmission unit to receive the multicast service data transmitted by the base station, the processor is specifically configured to control the receiver to receive the multicast service data repeatedly transmitted by the base station according to the transmission times and by using the multicast service data unit as a repeat transmission unit.

24. The terminal of claim 21, wherein a transmission mode of the multicast service data is: and under the condition that the multicast service data transmitted by the base station is received by taking the multicast service data packet as a repeat transmission unit, the processor is specifically configured to control the receiver to receive the multicast service data repeatedly transmitted by the base station by taking the multicast service data packet as a repeat transmission unit according to the transmission times.

25. The terminal of claim 21, wherein the receiver is further configured to receive multicast service notification information sent by the base station, and the multicast service notification information is used to indicate the number of multicast service data packets of the multicast service data to the terminal.

26. The terminal according to claim 25, wherein the processor is specifically configured to control the receiver to receive, according to the transmission indication information, first indication information sent by the base station, determine, according to the first indication information, whether a multicast service data packet corresponding to an identifier of the multicast service data packet has been successfully received, and when it is determined that the multicast service data packet indicated by the identifier of the multicast service data packet has not been successfully received, control the receiver to continue receiving, according to the transmission indication information, the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station;

the first indication information is used for indicating the identifier of the multicast service data packet; the first indication information is indication information generated by the base station for the multicast service data packet of the multicast service data according to the number of the multicast service data packets.

27. The terminal of claim 26, wherein the processor is further configured to, after controlling the receiver to continue receiving the multicast service data packet corresponding to the identifier of the multicast service data packet sent by the base station, record the identifier of the multicast service data packet when it is determined that the multicast service data packet corresponding to the identifier of the multicast service data packet is successfully received.

28. The terminal of claim 26, wherein the processor is specifically configured to determine whether the identifier of the recorded multicast service data packet includes the identifier of the multicast service data packet, and determine that the multicast service data packet corresponding to the identifier of the multicast service data packet is not successfully received when it is determined that the identifier of the recorded multicast service data packet does not include the identifier of the multicast service data packet.

29. A communication system, the communication system comprising: a base station according to any of claims 16-20, and a terminal according to any of claims 21-28.

30. A computer-readable storage medium, having stored therein at least one program code, which is loaded and executed by a processor to implement the method according to any one of claims 1 to 6.

31. A computer-readable storage medium, having stored therein at least one program code, which is loaded and executed by a processor to implement the method according to any one of claims 7 to 14.