CN116208302A

CN116208302A - Multicast service transmission method, terminal, base station, electronic equipment and storage medium

Info

Publication number: CN116208302A
Application number: CN202111444026.1A
Authority: CN
Inventors: 杨蓓; 朱剑驰; 佘小明; 蒋峥; 谢伟良; 王庆扬
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2023-06-02

Abstract

The disclosure provides a multicast service transmission method, a terminal, a base station, electronic equipment and a storage medium, and relates to the technical field of communication. The method comprises the following steps: the terminal receives the multicast service transmission configuration information sent by the base station, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time frequency resource configuration information and uplink feedback configuration information, wherein the downlink time frequency resource configuration information is used for receiving downlink multicast service data from the base station by the terminal, the uplink feedback configuration information is used for sending uplink measurement feedback information to the base station by the terminal, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; and the terminal receives the downlink multicast service data from the base station according to the multicast service transmission configuration information and/or sends uplink measurement feedback information to the base station. The method and the device can optimize and adjust the configuration information of the multicast service transmission according to the uplink measurement feedback of the multicast service transmission, and improve the service quality of the multicast service transmission.

Description

Multicast service transmission method, terminal, base station, electronic equipment and storage medium

Technical Field

The disclosure relates to the field of communication technologies, and in particular, to a multicast service transmission method, a terminal, a base station, an electronic device and a storage medium.

Background

The RRC Inactive (Inactive) state has significant energy saving advantages over the RRC Connected state (Connected). The 3GPP will be specifically defined and designed for multicast traffic transmission in the RRC_IDLE/INACTIVE state. In general, the requirement of the multicast service on QoS (Quality of Service ) is much higher than that of the broadcast service, so for the transmission of the multicast service in the inactive state, enhancement design is required in terms of improving the transmission rate and reliability.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure provides a multicast service transmission method, a terminal, a base station, an electronic device, and a storage medium, which at least overcome to some extent the technical problem that a terminal in an inactive state in a related technology is difficult to satisfy the quality of service requirement of a multicast service.

Other features and advantages of the present disclosure will be apparent from the following detailed description, or may be learned in part by the practice of the disclosure.

According to one aspect of the present disclosure, there is provided a multicast service transmission method, the method including: the terminal receives multicast service transmission configuration information sent by the base station, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; and the terminal receives downlink multicast service data from the base station according to the multicast service transmission configuration information and/or sends the uplink measurement feedback information to the base station.

In some embodiments, the multicast service transmission configuration information is for a terminal in one of the following states: an RRC inactive state and an RRC idle state.

In some embodiments, the base station transmits multicast service transmission configuration information to the terminal by at least one of: broadcasting the multicast service transmission configuration information using a system message; carrying the multicast service transmission configuration information in the existing RRC message; and carrying the multicast service transmission configuration information in a special RRC message which is newly added for multicast service configuration.

In some embodiments, the multicast service transmission configuration information is for all or part of the terminals or a particular terminal served by the base station.

In some embodiments, the multicast traffic transmission configuration information is for all or part or a particular multicast traffic type, and/or a multicast group, and/or a UE group.

In some embodiments, the terminal acquires the multicast service type or the multicast group or the UE group to which the terminal belongs by one of the following modes: according to the non-access layer signaling of the core network, acquiring a multicast group or a UE group configured for the terminal by the core network through the non-access layer signaling; acquiring a multicast service type or a multicast group to which the terminal belongs according to standards or network predefining; and determining the multicast service type or the UE group to which the terminal belongs according to the service information of the terminal.

In some embodiments, the uplink feedback configuration information at least includes one of the following: physical uplink control channel resource configuration information, small packet transmission configuration information, and uplink channel configuration information in an RRC inactive state or an RRC idle state.

In some embodiments, when the terminal transmits the uplink measurement feedback information according to the physical uplink control channel resource configuration information, distinguishing whether the uplink measurement feedback information is the multicast service by at least one of the following methods includes: the new uplink control information format is added, the partial field is added based on the mode of multiplexing the partial field of the existing uplink control information format, and the cyclic redundancy check scrambling code type is added based on the mode of the existing uplink control information format. In some embodiments, when the terminal sends the uplink measurement feedback information according to the small data packet transmission configuration information, the uplink measurement feedback information is carried by a message a of the 2-step random access procedure or a message 3 of the 4-step random access procedure; and distinguishing whether the uplink measurement feedback information is multicast service or not through different preamble sequences and/or random access occasions and/or random access configurations.

In some embodiments, when the terminal sends the uplink measurement feedback information according to the uplink channel configuration information in the RRC inactive state or the RRC idle state, an uplink data sending mechanism of the terminal in the RRC inactive state or the RRC idle state is defined.

In some embodiments, the multicast service transmission configuration information is configured according to at least one of multicast service feature information, network coverage, geographical environment information, channel conditions, geographical location information of the base station and the terminal.

In some embodiments, the uplink feedback configuration information is used for the terminal to uplink feedback information of at least one of the following: HARQ-ACK feedback information, CSI measurement information, SSB measurement information.

In some embodiments, the base station is further configured to perform optimization adjustment on multicast service transmission configuration information sent to all or part of a cell service where the base station is located or to a specific terminal according to uplink measurement feedback information sent by the terminal.

According to another aspect of the present disclosure, there is also provided a multicast service transmission method, including: the base station sends multicast service transmission configuration information to the terminal, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; and the base station transmits downlink multicast service data to the terminal and/or receives uplink measurement feedback information transmitted by the terminal according to the multicast service transmission configuration information.

According to another aspect of the present disclosure, there is also provided a terminal including: the system comprises a multicast service configuration acquisition module, a multicast service configuration processing module and a multicast service configuration processing module, wherein the multicast service configuration acquisition module is used for receiving multicast service transmission configuration information sent by a base station, and the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; and the first multicast service transmission module is used for receiving the downlink multicast service data from the base station and/or sending the uplink measurement feedback information to the base station according to the multicast service transmission configuration information.

According to another aspect of the present disclosure, there is also provided a base station including: the multicast service configuration issuing module is used for sending multicast service transmission configuration information to the terminal, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; and the second multicast service transmission module is used for sending downlink multicast service data to the terminal and/or receiving the uplink measurement feedback information sent by the terminal according to the multicast service transmission configuration information.

According to another aspect of the present disclosure, there is also provided an electronic device including: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform any of the multicast service delivery methods described above via execution of the executable instructions.

According to another aspect of the present disclosure, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the multicast service transmission method of any one of the above.

According to the multicast service transmission method, the terminal, the base station, the electronic equipment and the storage medium, the terminal receives downlink multicast service data from the base station according to the multicast service transmission configuration information sent by the base station and/or sends uplink measurement feedback information to the base station, so that the terminal in an RRC inactive state and/or an RRC idle state can realize uplink measurement feedback of multicast service transmission, and the base station can optimize and adjust the multicast service transmission configuration information according to the uplink measurement feedback information of the terminal, thereby improving the service quality of multicast service transmission.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

FIG. 1 illustrates a schematic diagram of a communication system architecture in an embodiment of the present disclosure;

fig. 2 shows a flowchart of a multicast service transmission method applied to a terminal side in an embodiment of the present disclosure;

fig. 3 shows a flowchart of a multicast service transmission method applied to a base station side in an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of internal components of a terminal according to an embodiment of the disclosure;

FIG. 5 is a schematic diagram of an internal component module of a base station according to an embodiment of the disclosure;

FIG. 6 shows a block diagram of an electronic device in an embodiment of the disclosure;

fig. 7 shows a schematic diagram of a computer-readable storage medium in an embodiment of the disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software or in one or more hardware modules or integrated circuits or in different networks and/or processor devices and/or microcontroller devices.

For ease of understanding, before describing embodiments of the present disclosure, several terms referred to in the embodiments of the present disclosure are first explained as follows:

DRX: english is called Discontinuous Reception, and is translated into discontinuous reception;

RRC: english is called Radio Resource Control, and is translated into radio resource control;

CSI: english is called Channel State Information, and is translated into channel state information;

SSB: english is called Synchronization Signal Block, translated into a 'synchronous signal block', and synchronous signals PSS, SSS and PBCH channels jointly form SSB;

HARQ-ACK: english is called Hybrid Automatic Repeat Request ACK, and is translated into 'hybrid automatic repeat request-acknowledgement'.

Embodiments of the present disclosure are described in detail below with reference to the attached drawings.

Fig. 1 is a schematic diagram of a communication system architecture according to an embodiment of the disclosure, where, as shown in fig. 1, the communication system architecture includes a network side device 101 and a terminal 102; the network side device 101 sends the multicast service transmission configuration information to the terminal 102, and after receiving the multicast service transmission configuration information from the base station 101, the terminal 102 receives downlink multicast service data from the base station and/or sends uplink measurement feedback information to the base station according to the multicast service transmission configuration information.

Optionally, the terminal 102 in the embodiment of the present disclosure may also be referred to as a UE (User Equipment), and in a specific implementation, the terminal 102 may be a terminal side Device such as a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer), a personal digital assistant (Personal Digital Assistant, PDA), a mobile internet Device (Mobile Internet Device, MID), a Wearable Device (webable Device), or a vehicle-mounted Device, which is not limited to a specific type of the terminal in the embodiment of the present disclosure.

Alternatively, the network-side device 101 in the embodiment of the present disclosure may be a base station, a relay, or an access point, or the like. The base station may be a 5G or later version base station (e.g., 5G NR NB, gNB, ng-teng, en-gNB), or a base station in other communication systems (e.g., eNB (Evolutional Node B, evolved base station)), and it should be noted that the specific type of network side device is not limited in the embodiments of the present disclosure.

Those skilled in the art will appreciate that the number of terminals and network side devices in fig. 1 is merely illustrative, and any number of terminals and network side devices may be provided as desired. The embodiments of the present disclosure are not limited in this regard.

Under the system architecture, the embodiment of the disclosure provides a multicast service transmission method applied to a terminal side, and the method can be executed by any electronic device with computing processing capability.

Fig. 2 shows a flowchart of a multicast service transmission method applied to a terminal side in an embodiment of the present disclosure, and as shown in fig. 2, the multicast service transmission method provided in the embodiment of the present disclosure includes the following steps:

step S202, the terminal receives the multicast service transmission configuration information sent by the base station, wherein the multicast service transmission configuration information at least comprises one of the following steps: the base station comprises downlink time frequency resource configuration information and uplink feedback configuration information, wherein the downlink time frequency resource configuration information is used for receiving downlink multicast service data from the base station by the terminal, the uplink feedback configuration information is used for sending uplink measurement feedback information to the base station by the terminal, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information.

In the new generation wireless communication system (NR system or 5G system), three radio resource control RRC states are supported, respectively: an IDLE state (rrc_idle), an INACTIVE state (rrc_inactive), and a CONNECTED state (rrc_connected). The terminal UE in the inactive state keeps the core network connection, but has no air interface connection, namely has no connection relation with a specific cell which can perform data transmission at any time. Because the multicast service transmission requires higher QoS requirements, an enhanced design of the multicast service transmission is required for the terminals in the RRC idle state and the RRC inactive state to improve the rate and reliability of the multicast service transmission.

The terminal in the step S202 described above in the embodiment of the present disclosure may be, but is not limited to, a terminal in one of the following states: an RRC inactive state and an RRC idle state. When the terminal receiving the multicast service transmission configuration information is the terminal in the RRC inactive state or the RRC idle state, the terminal in the RRC inactive state or the RRC idle state can receive the downlink multicast service data from the base station according to the downlink time-frequency resource configuration information sent by the base station, and the service quality of the multicast service transmission is improved. Further, the terminal in the RRC inactive state or the RRC idle state sends uplink measurement feedback information to the base station according to the uplink feedback configuration information sent by the base station, so that the multicast service transmission configuration information can be optimized and adjusted according to the uplink measurement feedback information of the terminal, and the service quality of the multicast service transmission is further improved.

In step S204, the terminal receives the downlink multicast service data from the base station and/or sends uplink measurement feedback information to the base station according to the multicast service transmission configuration information.

It should be noted that, the multicast service transmission configuration information sent by the base station to the terminal includes downlink time-frequency resource configuration information and/or uplink feedback configuration information, so when the above step S204 is implemented, the following cases may be included:

first case: the terminal receives downlink multicast service data from the base station according to the downlink time-frequency resource configuration information sent by the base station;

second case: the terminal sends uplink measurement feedback information to the base station according to the uplink feedback configuration information sent by the base station;

third case: and the terminal receives the downlink multicast service data from the base station according to the downlink time-frequency resource configuration information sent by the base station, and sends uplink measurement feedback information to the base station according to the uplink feedback configuration information sent by the base station.

As can be seen from the foregoing, in the multicast service transmission method provided by the embodiments of the present disclosure, the terminal receives downlink multicast service data from the base station according to the multicast service transmission configuration information sent by the base station, and/or sends uplink measurement feedback information to the base station, so that the terminal in the RRC inactive state and/or the RRC idle state can implement uplink measurement feedback of multicast service transmission, so that the base station optimizes and adjusts the multicast service transmission configuration information according to the uplink measurement feedback information of the terminal, and improves the service quality of multicast service transmission.

In some embodiments, the base station sends the multicast service transmission configuration information to the terminal by at least one of: transmitting configuration information using a system message broadcast multicast service; carrying multicast service transmission configuration information in the existing RRC message; a dedicated RRC message for multicast service configuration is newly added.

In the embodiment of the disclosure, the cell broadcast system message SIB or the dedicated RRC message of the multicast service is used or the existing RRC message (such as RRC connection release message) carries the time-frequency resource configuration of the cell multicast service and the uplink feedback configuration information of the terminal multicast service, so that the terminal can effectively acquire the time-frequency resources used by different multicast services/multicast groups/UE groups and the uplink feedback time-frequency resource configuration in an RRC inactive state and/or an RRC idle state.

In some embodiments, the multicast service transmission configuration information in the embodiments of the present disclosure may be used for all terminals or part of terminals or specific terminals served by the cell in which the base station is located. The multicast service transmission configuration information may be for all or part of terminals or specific terminals within the cell in which the base station is located. For example: different users of the cell service can use different multicast service transmission configurations according to the cell coverage condition and the geographic environment, and terminals with close geographic ranges can receive the multicast service by adopting the same multicast beam, wherein the multicast beam is one configuration parameter in the multicast service transmission configuration information.

In some embodiments, the multicast traffic transmission configuration information is for all or part or a particular multicast traffic type, and/or multicast group, and/or UE group. Different multicast services and/or multicast groups and/or terminal groups may employ different multicast service transmission configurations. The cell configures multicast service configuration information for service users, the terminal selects multicast service transmission configuration for use according to the multicast service and/or the multicast group and/or the terminal group, carries out different multicast service transmission configuration aiming at different multicast service requirements, and provides different multicast service configurations (such as wide/narrow wave beams, repeated transmission times and time-frequency resource size) according to different service QoS and terminal QoE requirements so as to meet the requirements of different capacities, rates, time delays and reliability.

In some embodiments, the terminal obtains the multicast service type or the multicast group or the UE group to which it belongs by one of the following ways: according to the non-access layer signaling of the core network, acquiring a multicast group or a UE group configured for the terminal by the core network through the non-access layer signaling; acquiring a multicast service type or a multicast group or a UE group to which a terminal belongs according to standards or network predefining; and determining the multicast service type or the multicast group or the UE group to which the terminal belongs according to the service information of the terminal.

For example: the core network configures the terminal to belong to a certain multicast group/UE group for the terminal through non-access layer signaling; the terminal judges that the terminal belongs to a certain multicast service or a multicast group or a UE group according to the multicast service of the terminal according to the standard or the network predefining. The network predefining may be that the operator self-defines different multicast service types, multicast groups, terminal groups, etc. according to the multicast service types/user grades, etc. provided by the own network, so as to facilitate the operator to provide differentiated customized multicast service for the user. In addition, the multicast service type or the terminal group to which the terminal belongs can be obtained according to the terminal service information provided by the terminal application.

In some embodiments, the uplink feedback configuration information at least includes one of the following: physical uplink control channel (Physical Uplink Control Channel, PUCCH) resource configuration information, small packet transmission configuration information, uplink channel configuration information in RRC inactive state or RRC idle state. Configuring resources for transmitting PUCCH by different multicast service/multicast group/UE group while configuring multicast time-frequency resources, transmitting the above measurement feedback information of the multicast service to the base station using a PUCCH channel, wherein whether to be uplink measurement feedback information of the multicast service can be distinguished by at least one of the following methods, including: the new uplink control information format is added, the partial field is added based on the existing uplink control information format, the Cyclic Redundancy Check (CRC) scrambling code type (such as multicast broadcast special RNTI value MBS-C-RNTI/M-RNTI/MBS-RNTI), the multicast service HARQ process and the UCI channel format special for the multicast service are added based on the existing uplink control information format.

When a terminal is in an RRC inactive state or an RRC idle state, a multicast service needs a higher QoS/QoE requirement relative to broadcast information, and the embodiments of the present disclosure may provide a flexible and effective uplink feedback mechanism by, but not limited to, the following three ways, so as to effectively promote QoS guarantee of the multicast service:

1) Uplink feedback (newly adding UCI format or multiplexing partial field in the existing UCI format or newly adding partial field based on the existing UCI format, newly adding Cyclic Redundancy Check (CRC) scrambling code type based on the existing UCI format) of the multicast service is realized by using PUCCH; whether the uplink measurement feedback information of the multicast service is the uplink measurement feedback information of the multicast service can be distinguished through a multicast service HARQ process or a UCI channel format special for the multicast service.

2, using small data packet transmission configuration to realize the uplink feedback of the multicast service, and carrying uplink feedback measurement information of the multicast service through two messages which can carry uplink load by 2 steps of random access message A or 4 steps of random access message 3; the above measurement feedback information and/or different multicast services/multicast groups/UE groups may be optionally differentiated for multicast services by a preamble sequence and/or random access occasions RO.

It should be noted that, in the 4G LTE and R15G systems, the random access technology adopted is a conventional 4-step random access technology, and the terminal and the base station need to perform 5 times of information interaction to complete the random access process, which are respectively: (1) the terminal sends a message 1 to the base station, wherein the message 1 is a preamble sequence and is used for timing advance estimation by the base station; (2) the base station sends a message 2 to the terminal, wherein the message 2 is a random access response of the message 1, and comprises a preamble sequence identifier, a TA (Timing Advance) indication, uplink authorization information of the message 3 sent by the terminal to the base station, and a temporary cell radio network temporary identifier (TC-RNTI); (3) the terminal sends a message 3 to the base station, when the terminal reads the preamble sequence identifier corresponding to the message 1 in the message 2, the message 3 is sent by using the uplink authorization in the message 2, and the content of the message 3 is related to an event triggering a random access process; (4) the base station sends a message 4 to the terminal, wherein the message 4 is a response for resolving the competition conflict, and when the message 4 detected by the terminal contains relevant competition conflict resolution identification information in the corresponding message 3, the random access is considered to be successful; (5) the terminal that successfully detects message 4 sends an ACK acknowledgment to the base station.

It can be seen that a 4-step random access technique based on multiple information interactions between a terminal and a base station introduces a large delay overhead. In order to reduce the time delay in the random access process, a 2-step random access technology is introduced into 5G R16, the information of the message A is designed to bear the functions of the message 1 and the message 3, the message A is transmitted to the base station once by the terminal, the response information B corresponding to the message A is designed to bear the functions of the message 2 and the message 4, and the message A is transmitted to the terminal once by the base station, so that the steps of the random access process are simplified, and the transmission efficiency of the system is improved.

3) Uplink channel configuration information defining RRC inactive state and/or RRC idle state (e.g.: defining new uplink transmission channel, defining new uplink transmission mechanism by using existing uplink transmission channel, distinguishing uplink feedback of multicast service by preamble sequence or random access time or random access configuration), and implementing uplink feedback of multicast service. For example: the uplink feedback of the multicast service uses a specific random access preamble sequence set, or a specific partial random access opportunity, or a separate random access configuration, and uses different time-frequency resource partitions to perform the uplink feedback of the multicast service.

In either way, the base station can schedule the multicast service transmission configuration more reasonably (for example, reduce the MCS level of the multicast or increase the repetition coefficient of the data channel or modulate the beam) according to the information fed back by the uplink of the terminal, thereby improving the reliability of the multicast service transmission.

In some embodiments, when the terminal transmits uplink measurement feedback information of the multicast service according to the physical uplink control channel resource configuration information, whether the uplink measurement feedback information of the multicast service is the uplink measurement feedback information of the multicast service may be distinguished by newly adding an uplink control information (Uplink Control Information, UCI) format or multiplexing a partial field based on an existing uplink control information format.

In the above embodiment, whether the uplink measurement feedback information is the multicast service is distinguished by adding the uplink control information format, so that the uplink control information format can be defined according to the requirement, and flexible configuration is realized; the method of using the existing uplink control information format multiplexing part field to distinguish whether the uplink measurement feedback information is the multicast service (for example, using the original UCI HARQ process to distinguish whether the uplink measurement feedback information is the multicast service) does not need to add a new uplink control information format, does not need additional blind detection times and complexity, and is simpler to implement.

In some embodiments, when the terminal sends uplink measurement feedback information of the multicast service according to the small data packet transmission configuration information, the message a of the 2-step random access procedure or the message 3 of the 4-step random access procedure carries the uplink measurement feedback information; and distinguishing whether the uplink measurement feedback information is multicast service or not through different preamble sequences and/or random access occasions and/or random access configurations.

In the above embodiment, the small packet transmission configuration is used, and two messages that can carry uplink load carry uplink feedback information of multicast service through 2 steps of random access message a or 4 steps of random access message 3, or different multicast service/multicast group/UE group is distinguished by using different preamble sequences and/or random access timing (RO) and/or random access configuration. The existing small data packet transmission mechanism is utilized without additionally increasing standard definition workload of a base station and a terminal, development difficulty is low, different multicast services/multicast groups/UE groups can be distinguished simply and easily by using a preamble sequence/random access time/random access configuration, multicast service related information carried by the terminal is convenient to transfer implicitly, and the method can be effectively distinguished from the conventional public random access/slice exclusive random access/small data packet random access. After the uplink feedback of the multicast service is obtained by the method, the uplink feedback base station of the multicast service adopting small data packet transmission can optimally adjust the downlink multicast service transmission configuration based on uplink measurement feedback information.

In some embodiments, when the terminal sends uplink measurement feedback information of the multicast service according to the uplink channel configuration information in the RRC inactive state or the RRC idle state, an uplink data sending mechanism of the terminal in the RRC inactive state or the RRC idle state is defined.

The terminal may use the RRC inactive state/RRC idle state to newly define the physical channel or perform uplink feedback based on a new transmission mechanism of the existing physical channel. For example: defining a new uplink physical channel as single uplink information based on a specific preamble sequence and a data load, wherein the base station does not need to send a response after receiving the information; for example: defining a new UCI format to transmit on an existing PUCCH, or defining a new preamble sequence or transmitting on PRACH using an existing partial preamble sequence through a network configuration.

In some embodiments, the multicast service transmission configuration information in the embodiments of the present disclosure may be configured according to at least one of multicast service characteristic information (e.g., service period, service size, service QoS requirement, etc.), network coverage, geographical environment information, channel condition, geographical location information of the base station and the terminal.

Different multicast services require different QoS/QoE requirements, for example, a multicast service with higher latency and reliability requirements should be configured with a lower MCS level and a higher channel repetition coefficient to ensure that the service reaches the reliability index within the latency requirements. For transmitting multicast traffic on a higher frequency band, the beam/millimeter wave will be the main transmission means adopted, and different network coverage conditions, geographic environments and geographic locations will affect the use of millimeter waves, for example: for a group of terminals with more concentrated geographic positions, the same more concentrated narrow beams can be used for transmitting multicast service data, and for some terminals with more uniform geographic distribution, the wide beams with a large range are more suitable.

In some embodiments, the uplink feedback configuration information is used for uplink feedback of at least one of the following information by the terminal: HARQ-ACK feedback information, CSI measurement information, SSB measurement information.

In the above embodiment, based on the HARQ-ACK feedback information of the terminal uplink feedback, the base station may stop sending the multicast service data that has been received successfully, and repeatedly send the multicast service data that has not been received successfully, so as to improve the system resource utilization, improve the spectrum efficiency, reduce the multicast service receiving delay, and ensure QoS/QoE; based on the CSI measurement information and SSB measurement information fed back by the terminal in the uplink, the base station may adjust and optimize the configuration of the multicast service transmission according to the better configuration of the measurement feedback information, for example: MCS level selection, number of repetitions, beam configuration, etc.

It should be noted that, in a cellular communication system, signal transmission failure is caused by time-varying characteristics of a wireless channel and influence of multipath fading, and some unpredictable interference, a method such as forward error correction (FEC, forward Error Correction) coding and Automatic Repeat reQuest (ARQ) is generally used for error control, so as to ensure quality of service.

ARQ and FEC are used in most wireless packet transmission systems in a hybrid, i.e. hybrid automatic repeat request (HARQ, hybrid Automatic Repeat reQuest) regime. In HARQ, FEC is adopted to reduce the retransmission times, reduce the error rate, and ARQ retransmission and CRC check are used to ensure the situation that the packet data transmission and the like have extremely low requirement on the error rate. The mechanism is a compromise scheme, errors are automatically corrected within the error correction capability range, and the sending end is required to resend when the error correction capability exceeds the error correction range, so that the reliability of the system is improved, and the transmission efficiency of the system is improved.

In some embodiments, the base station is further configured to optimally adjust, according to uplink measurement feedback information sent by the terminal, multicast service transmission configuration information sent to all or part of a cell service where the base station is located or to a specific terminal. For example, the base station selects a beam for multicast service transmission according to the SSB measurement feedback result, for example: different groups of UEs use different beams. When the number of HARQ-ACK failures is excessive/CSI feedback/SSB measurements is below a set RSRP/SINR threshold, the base station may decrease the MCS level used by the multicast service/increase the repetition factor of the data channel/adjust the power control or beam.

It should be noted that RSRP (Reference Signal Receiving Power, reference signal received power) is one of the key parameters representing radio signal strength and physical layer measurement requirements in the LTE/NR network, and is an average value of signal powers received on all REs (resource elements) carrying reference signals within a certain symbol. SINR (Signal to Interference plus Noise Ratio ) refers to the ratio of the strength of a received useful signal to the strength of a received interfering signal (noise and interference); can be simply understood as "signal to noise ratio"; MCS (Modulation and Coding Scheme, modulation and coding strategy) is used to implement configuration to achieve 802.11n/LTE/NR radio frequency rates.

Under the system architecture shown in fig. 1, the embodiment of the present disclosure further provides a multicast service transmission method applied to a network device (e.g., a base station), where the method may be performed by any electronic device with computing processing capability.

Fig. 3 shows a flowchart of a multicast service transmission method applied to a base station side in an embodiment of the present disclosure, and as shown in fig. 3, the multicast service transmission method provided in the embodiment of the present disclosure includes the following steps:

step S302, the base station sends multicast service transmission configuration information to the terminal, where the multicast service transmission configuration information at least includes one of the following: the base station comprises downlink time frequency resource configuration information and uplink feedback configuration information, wherein the downlink time frequency resource configuration information is used for receiving downlink multicast service data from the base station by the terminal, the uplink feedback configuration information is used for sending uplink measurement feedback information to the base station by the terminal, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information;

step S304, the base station sends the downlink multicast service data to the terminal, and/or receives the uplink measurement feedback information sent by the terminal according to the multicast service transmission configuration information.

As can be seen from the foregoing, in the multicast service transmission method provided by the embodiments of the present disclosure, the base station sends the multicast service transmission configuration information to the terminal, so that the terminal receives downlink multicast service data from the base station according to the multicast service transmission configuration information, and/or sends uplink measurement feedback information to the base station, so that the terminal in an RRC inactive state and/or an RRC idle state can implement uplink measurement feedback of multicast service transmission, so that the base station optimizes and adjusts the multicast service transmission configuration information according to the uplink measurement feedback information of the terminal, and improves service quality of multicast service transmission.

Based on the same inventive concept, a terminal is also provided in the embodiments of the present disclosure, as described in the following embodiments. Since the principle of the solution of the problem of the terminal embodiment is similar to that of the method embodiment, the implementation of the terminal embodiment can refer to the implementation of the method embodiment, and the repetition is omitted.

Fig. 4 is a schematic diagram illustrating internal components of a terminal according to an embodiment of the present disclosure, as shown in fig. 4, where the terminal includes: a multicast service configuration acquisition module 41 and a first multicast service transmission module 42.

The multicast service configuration obtaining module 41 is configured to receive multicast service transmission configuration information sent by the base station, where the multicast service transmission configuration information at least includes one of the following: the base station comprises downlink time frequency resource configuration information and uplink feedback configuration information, wherein the downlink time frequency resource configuration information is used for receiving downlink multicast service data from the base station by the terminal, the uplink feedback configuration information is used for sending uplink measurement feedback information to the base station by the terminal, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; the first multicast service transmission module 42 is configured to receive downlink multicast service data from the base station and/or send uplink measurement feedback information to the base station according to the multicast service transmission configuration information.

As can be seen from the above, the terminal provided in the embodiments of the present disclosure receives, through the multicast service configuration obtaining module 41, the multicast service transmission configuration information sent by the base station; the first multicast service transmission module 42 receives downlink multicast service data from the base station according to the multicast service transmission configuration information and/or sends uplink measurement feedback information to the base station, so that the terminal in the RRC inactive state and/or the RRC idle state can implement uplink measurement feedback of multicast service transmission, and the base station can optimize and adjust the multicast service transmission configuration information according to the uplink measurement feedback information of the terminal, thereby improving the service quality of multicast service transmission.

Based on the same inventive concept, a base station is also provided in the embodiments of the present disclosure, as described in the following embodiments. Since the principle of the solution of the problem of the base station embodiment is similar to that of the method embodiment, the implementation of the base station embodiment can be referred to the implementation of the method embodiment, and the repetition is omitted.

Fig. 5 is a schematic diagram showing internal constituent modules of a base station according to an embodiment of the disclosure, as shown in fig. 5, the base station includes: a multicast service configuration issuing module 51 and a second multicast service transmitting module 52.

The multicast service configuration issuing module 51 is configured to send multicast service transmission configuration information to the terminal, where the multicast service transmission configuration information at least includes one of the following: the base station comprises downlink time frequency resource configuration information and uplink feedback configuration information, wherein the downlink time frequency resource configuration information is used for receiving downlink multicast service data from the base station by the terminal, the uplink feedback configuration information is used for sending uplink measurement feedback information to the base station by the terminal, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; the second multicast service transmission module 52 is configured to send downlink multicast service data to the terminal, and/or receive uplink measurement feedback information sent by the terminal according to the multicast service transmission configuration information.

As can be seen from the foregoing, in the base station provided in the embodiments of the present disclosure, the multicast service configuration issuing module 51 sends the multicast service transmission configuration information to the terminal, so that after the second multicast service transmission module 52 sends the downlink multicast service data to the terminal, the terminal receives the downlink multicast service data from the base station according to the multicast service transmission configuration information, and/or sends the uplink measurement feedback information to the base station, so that the terminal in the RRC inactive state and/or the RRC idle state can implement uplink measurement feedback of multicast service transmission, so that the base station optimizes and adjusts the multicast service transmission configuration information according to the uplink measurement feedback information of the terminal, and improves the service quality of multicast service transmission.

Those skilled in the art will appreciate that the various aspects of the present disclosure may be implemented as a system, method, or program product. Accordingly, various aspects of the disclosure may be embodied in the following forms, namely: an entirely hardware embodiment, an entirely software embodiment (including firmware, micro-code, etc.) or an embodiment combining hardware and software aspects may be referred to herein as a "circuit," module "or" system.

An electronic device 600 according to such an embodiment of the present disclosure is described below with reference to fig. 6. The electronic device 600 shown in fig. 6 is merely an example and should not be construed to limit the functionality and scope of use of embodiments of the present disclosure in any way.

As shown in fig. 6, the electronic device 600 is in the form of a general purpose computing device. Components of electronic device 600 may include, but are not limited to: the at least one processing unit 610, the at least one memory unit 620, and a bus 630 that connects the various system components, including the memory unit 620 and the processing unit 610.

Wherein the storage unit stores program code that is executable by the processing unit 610 such that the processing unit 610 performs steps according to various exemplary embodiments of the present disclosure described in the above-described "exemplary methods" section of the present specification.

When the electronic device 600 shown in fig. 6 is a terminal, the processing unit 610 may perform the following steps of the above-described method embodiment: receiving multicast service transmission configuration information sent by a base station, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time frequency resource configuration information and uplink feedback configuration information, wherein the downlink time frequency resource configuration information is used for receiving downlink multicast service data from the base station by the terminal, the uplink feedback configuration information is used for sending uplink measurement feedback information to the base station by the terminal, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; and receiving downlink multicast service data from the base station and/or sending uplink measurement feedback information to the base station according to the multicast service transmission configuration information.

When the electronic device 600 shown in fig. 6 is a base station, the processing unit 610 may perform the following steps of the above-described method embodiment: transmitting multicast service transmission configuration information to the terminal, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time frequency resource configuration information and uplink feedback configuration information, wherein the downlink time frequency resource configuration information is used for receiving downlink multicast service data from the base station by the terminal, the uplink feedback configuration information is used for sending uplink measurement feedback information to the base station by the terminal, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information; and transmitting the downlink multicast service data to the terminal, and/or receiving uplink measurement feedback information transmitted by the terminal according to the multicast service transmission configuration information.

The storage unit 620 may include readable media in the form of volatile storage units, such as Random Access Memory (RAM) 6201 and/or cache memory unit 6202, and may further include Read Only Memory (ROM) 6203.

The storage unit 620 may also include a program/utility 6204 having a set (at least one) of program modules 6205, such program modules 6205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.

Bus 630 may be a local bus representing one or more of several types of bus structures including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or using any of a variety of bus architectures.

The electronic device 600 may also communicate with one or more external devices 640 (e.g., keyboard, pointing device, bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 600, and/or any device (e.g., router, modem, etc.) that enables the electronic device 600 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 650. Also, electronic device 600 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet, through network adapter 660. As shown, network adapter 660 communicates with other modules of electronic device 600 over bus 630. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with electronic device 600, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.

From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or may be implemented in software in combination with the necessary hardware. Thus, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.) or on a network, including several instructions to cause a computing device (may be a personal computer, a server, a terminal device, or a network device, etc.) to perform the method according to the embodiments of the present disclosure.

In an exemplary embodiment of the present disclosure, a computer-readable storage medium, which may be a readable signal medium or a readable storage medium, is also provided. Fig. 7 illustrates a schematic diagram of a computer-readable storage medium in an embodiment of the present disclosure, and as illustrated in fig. 7, a program product capable of implementing the above method of the present disclosure is stored on a computer-readable storage medium 700 provided in an embodiment of the present disclosure. In some possible implementations, various aspects of the disclosure may also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the steps according to the various exemplary embodiments of the disclosure as described in the "exemplary methods" section of this specification, when the program product is run on the terminal device.

More specific examples of the computer readable storage medium in the present disclosure may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

In this disclosure, a computer readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Alternatively, the program code embodied on a computer readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

In particular implementations, the program code for carrying out operations of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).

It should be noted that although in the above detailed description several modules or units of a device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.

Furthermore, although the steps of the methods in the present disclosure are depicted in a particular order in the drawings, this does not require or imply that the steps must be performed in that particular order or that all illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.

From the description of the above embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or may be implemented in software in combination with the necessary hardware. Thus, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.) or on a network, including several instructions to cause a computing device (may be a personal computer, a server, a mobile terminal, or a network device, etc.) to perform the method according to the embodiments of the present disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A method for transmitting multicast service, comprising:

the terminal receives multicast service transmission configuration information sent by the base station, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information;

and the terminal receives downlink multicast service data from the base station according to the multicast service transmission configuration information and/or sends the uplink measurement feedback information to the base station.

2. The multicast service transmission method according to claim 1, wherein the multicast service transmission configuration information is for a terminal in one of the following states: an RRC inactive state and an RRC idle state.

3. The multicast service transmission method according to claim 1, wherein the base station transmits multicast service transmission configuration information to the terminal at least by one of:

Broadcasting the multicast service transmission configuration information using a system message;

carrying the multicast service transmission configuration information in the existing RRC message;

a dedicated RRC message for multicast service configuration is newly added.

4. The multicast service transmission method according to claim 1, wherein the multicast service transmission configuration information is for all terminals or part of terminals or specific terminals served by the base station.

5. The multicast service transmission method according to claim 1, wherein the multicast service transmission configuration information is for all or part or a specific multicast service type, and/or a multicast group, and/or a UE group.

6. The method for transmitting multicast service according to claim 1, wherein the terminal obtains the multicast service type or the multicast group or the UE group to which itself belongs by one of the following means:

according to the non-access layer signaling of the core network, acquiring a multicast group or a UE group configured for the terminal by the core network through the non-access layer signaling;

acquiring a multicast service type or a multicast group or a UE group to which the terminal belongs according to standards or network predefining;

and determining the multicast service type or the multicast group or the UE group to which the terminal belongs according to the service information of the terminal.

7. The method for transmitting multicast service according to claim 1, wherein the uplink feedback configuration information at least comprises one of: physical uplink control channel resource configuration information, small packet transmission configuration information, and uplink channel configuration information in an RRC inactive state or an RRC idle state.

8. The method for transmitting multicast traffic according to claim 1 or 7, wherein when the terminal transmits the uplink measurement feedback information according to the physical uplink control channel resource allocation information, distinguishing whether the uplink measurement feedback information is the multicast traffic by at least one of the following methods comprises: the new uplink control information format is added, the partial field is added based on the mode of multiplexing the partial field of the existing uplink control information format, and the cyclic redundancy check scrambling code type is added based on the mode of the existing uplink control information format.

9. The multicast service transmission method according to claim 1 or 7, wherein when the terminal transmits uplink measurement feedback information according to the small data packet transmission configuration information, message a of a 2-step random access procedure or message 3 of a 4-step random access procedure carries uplink measurement feedback information; and distinguishing whether the uplink measurement feedback information is multicast service or not through different preamble sequences and/or random access occasions and/or random access configurations.

10. The method for multicast service transmission according to claim 1 or 7, wherein when the terminal transmits uplink measurement feedback information according to uplink channel configuration information in an RRC inactive state or an RRC idle state, an uplink data transmission mechanism of the terminal in the RRC inactive state or the RRC idle state is defined.

11. The multicast service transmission method according to any one of claims 1 to 7, wherein the multicast service transmission configuration information is configured according to at least one of multicast service feature information, network coverage, geographical environment information, channel condition, geographical location information of the base station and the terminal.

12. The method for transmitting multicast service according to any one of claims 1 to 7, wherein the uplink feedback configuration information is information for the terminal to uplink feedback at least one of: HARQ-ACK feedback information, CSI measurement information, SSB measurement information.

13. The method according to any one of claims 1 to 7, wherein the base station is further configured to optimally adjust multicast service transmission configuration information sent to all or part of the base station service or a specific terminal according to uplink measurement feedback information sent by the terminal.

14. A method for transmitting multicast service, comprising:

the base station sends multicast service transmission configuration information to the terminal, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information;

and the base station transmits downlink multicast service data to the terminal and/or receives uplink measurement feedback information transmitted by the terminal according to the multicast service transmission configuration information.

15. A terminal, comprising:

the system comprises a multicast service configuration acquisition module, a multicast service configuration processing module and a multicast service configuration processing module, wherein the multicast service configuration acquisition module is used for receiving multicast service transmission configuration information sent by a base station, and the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information;

And the first multicast service transmission module is used for receiving the downlink multicast service data from the base station and/or sending uplink measurement feedback information to the base station according to the multicast service transmission configuration information.

16. A base station, comprising:

the multicast service configuration issuing module is used for sending multicast service transmission configuration information to the terminal, wherein the multicast service transmission configuration information at least comprises one of the following components: the base station comprises downlink time-frequency resource configuration information and uplink feedback configuration information, wherein the downlink time-frequency resource configuration information is used for the terminal to receive downlink multicast service data from the base station, the uplink feedback configuration information is used for the terminal to send uplink measurement feedback information to the base station, and the uplink measurement feedback information comprises: uplink measurement information and/or uplink feedback information;

and the second multicast service transmission module is used for sending the downlink multicast service data to the terminal and/or receiving the uplink measurement feedback information sent by the terminal according to the multicast service transmission configuration information.

17. An electronic device, comprising:

a processor; and

a memory for storing executable instructions of the processor;

Wherein the processor is configured to perform the multicast service transmission method of any of claims 1-13 via execution of the executable instructions.

18. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the multicast service transmission method according to any of claims 1 to 13.