CN113950002B

CN113950002B - Switching method, terminal and base station of broadcast multicast transmission mode

Info

Publication number: CN113950002B
Application number: CN202010682228.9A
Authority: CN
Inventors: 王俊伟
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2023-05-26
Anticipated expiration: 2040-07-15
Also published as: CN116095615A; CN113950002A; WO2022012170A1

Abstract

The embodiment of the invention provides a switching method, a terminal and a base station of a broadcast multicast transmission mode, wherein the method comprises the following steps: acquiring a target transmission mode of a broadcast multicast service and acquiring configuration information of the target transmission mode; receiving the broadcast multicast service based on the configuration information of the target transmission mode; wherein, the target transmission mode is a PTP mode or a PTM mode; the acquisition mode of the target transmission mode comprises any one of the following: the target transmission mode indicated by the base station in DCI is obtained, the target transmission mode indicated by the base station in a multicast control channel MCCH is obtained, the target transmission mode indicated by the base station through MAC-CE is obtained, and the target transmission mode is obtained through a preset timer. The embodiment of the invention can rapidly indicate the transmission mode of the broadcast multicast service.

Description

Switching method, terminal and base station of broadcast multicast transmission mode

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a terminal, and a base station for switching a broadcast multicast transmission mode.

Background

With the increasing popularity of mobile video services, peer-to-peer multicast/broadcast streaming, group communication, and broadcast/multicast internet of things (The Internet of Things, ioT) applications, the global mobile communications industry has agreed that fifth generation mobile communication (5th generation mobile networks,5G) networks need to have the ability to flexibly and dynamically allocate wireless spectrum and network resources between unicast-type services and multicast-type services, and to support independent deployment of broadcast/multicast networks.

In the current 5G, the base station transmits two data types, one being terminal-oriented data that can only be received by the target terminal, such data being unicast data; another is data for all terminals or specific groups in the cell, i.e. all users or specific group users in the cell are able to receive the service.

In the technical evolution of New Radio, NR, two transmission modes, i.e., a point-to-point (PTP) transmission mode and a point-to-multipoint (PTM) transmission mode, are supported for more efficient broadcast multicast transmission. The PTP mode refers to that a transmitting node (base station) performs data transmission based on a single terminal, that is, a scheduling signaling and corresponding scheduling data are performed for one terminal; the method is characterized in that the base station can adjust the data code rate according to the channel condition of the terminal, and is beneficial to saving air interface resources when fewer users receive the broadcast and multicast service (namely, the terminals which need to receive the service in the PTP mode are fewer). The PTM mode means that the transmitting node performs data transmission based on a plurality of terminals, that is, the scheduling signaling and the corresponding scheduling data are performed for a group of terminals; the method is characterized in that data transmission is required to be carried out with a lower data code rate, and when the number of the receiving terminals is larger, the method is favorable for saving air interface resources.

When the transmission mode needs to be switched between the PTP mode and the PTM mode, how to effectively and quickly indicate that the transmission mode is changed to avoid the waste of air interface resources is a problem that needs to be studied at present.

Disclosure of Invention

The embodiment of the invention provides a switching method, a terminal and a base station of a broadcast multicast transmission mode, which are used for rapidly indicating the transmission mode of a broadcast multicast service.

The embodiment of the invention provides a switching method of a broadcast multicast transmission mode, which is applied to a terminal and comprises the following steps:

acquiring a target transmission mode of a broadcast multicast service and acquiring configuration information of the target transmission mode;

receiving the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

the target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode;

the acquisition mode of the target transmission mode comprises any one of the following: the method comprises the steps of obtaining the target transmission mode indicated by a base station in downlink control information DCI, obtaining the target transmission mode indicated by the base station in a multicast control channel MCCH, obtaining the target transmission mode indicated by the base station through a media access control-control unit MAC-CE, and obtaining the target transmission mode through a preset timer.

The embodiment of the invention provides a switching method of a broadcast multicast transmission mode, which is applied to a base station and comprises the following steps:

transmitting a target transmission mode of a broadcast multicast service to a terminal, and transmitting configuration information of the target transmission mode to the terminal so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

the method for transmitting the target transmission mode of the broadcast multicast service to the terminal comprises any one of the following steps: the target transmission mode is sent to the terminal through downlink control information DCI, the target transmission mode is sent to the terminal through a multicast control channel MCCH, and the target transmission mode is sent to the terminal through a media access control-control unit MAC-CE.

The embodiment of the invention provides a switching device of a broadcast multicast transmission mode, which is applied to a terminal and comprises the following components:

the acquisition module is used for acquiring a target transmission mode of the broadcast multicast service and acquiring configuration information of the target transmission mode;

a receiving module, configured to receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The embodiment of the invention provides a switching device of a broadcast multicast transmission mode, which is applied to a base station and comprises the following components:

the sending module is used for sending the target transmission mode of the broadcast multicast service to the terminal and sending the configuration information of the target transmission mode to the terminal so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

The embodiment of the invention provides a terminal, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of a switching method of a broadcast multicast transmission mode applied to the terminal when executing the computer program.

The embodiment of the invention provides a base station, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of a switching method applied to a broadcast multicast transmission mode of the base station when executing the computer program.

The embodiment of the invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the steps of the broadcast multicast transmission mode switching method.

According to the switching method, terminal and base station of the broadcast multicast transmission mode, the target transmission mode of the broadcast multicast service is obtained by adopting the DCI, MCCH, MAC-CE or preset timer mode, namely the PTM/PTP mode is switched, so that the switching of the transmission mode of the broadcast multicast service is more flexible, the change of the effective and rapid indication transmission mode is realized, the waste of air interface resources is avoided, and the air interface resources are effectively saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a step flowchart of a switching method of a broadcast multicast service transmission mode applied to a terminal in an embodiment of the present invention;

fig. 2 is a schematic diagram of indicating a target transmission mode of a plurality of broadcast multicast services through a bitmap in an embodiment of the present invention;

fig. 3 is a schematic diagram of a target transmission manner of a packet indicating a plurality of broadcast multicast services according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a second mode of target transmission of packet indicating multiple broadcast multicast services according to an embodiment of the present invention;

fig. 5 is a flow chart of steps of a switching method of a broadcast multicast service transmission mode applied to a base station in an embodiment of the present invention;

fig. 6 is a block diagram of a switching device applied to a broadcast multicast service transmission mode of a terminal in an embodiment of the present invention;

Fig. 7 is a block diagram of a switching device applied to a broadcast multicast service transmission mode of a base station in 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 schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In order to clearly describe the technical solutions of the embodiments of the present invention, in each embodiment of the present invention, if "first", "second", and the like words are used to distinguish the same item or similar items having substantially the same function and effect, those skilled in the art will understand that the "first", "second", and the like words do not limit the number and execution order.

In the embodiment of the invention, the term "and/or" describes the association relation of the association objects, which means that three relations can exist, for example, a and/or B can be expressed as follows: a exists alone, A and B exist together, and B exists alone. The character "three kinds generally indicates that the front-rear association object is an or relationship.

The term "plurality" in embodiments of the present invention means two or more, and other adjectives are similar.

Furthermore, it should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Specifically, in the current 5G system design, a region covered by a base station cell is divided into a plurality of regions, each region is divided into a system synchronization block coverage area (System synchronous block, SSB), when a system broadcast message is sent, each region will send a system broadcast message with the same content, and in order to ensure the coverage continuity, the SSB coverage areas are continuous and have a certain overlapping area, for example, one cell is covered by 4 SSBs. Specifically, the data transmission between the SSB coverage areas is time-division, that is, at different times, corresponding to the system broadcast message transmitted by each SSB coverage area. For example, assuming that a cell includes 4 SSB coverage areas, 2 candidate times for sending a broadcast message of a scheduling system of each SSB are included, and in one broadcast information monitoring opportunity window, 8 monitoring opportunities are included, each SSB coverage area has 2 monitoring opportunities, and in this case, for flexibility of base station scheduling, when sending broadcast information corresponding to each SSB coverage area, only the scheduling information of the broadcast information needs to be sent to a terminal on one of the monitoring opportunities. The scheduling information sent at the monitoring time is used to instruct the base station to send the scheduling information of the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) corresponding to the broadcast information in the SSB coverage area, including the time domain and frequency domain positions of the PDSCH, the modulation coding format, the redundancy version, and the like.

Broadcast multicast service is an important multimedia service that 5G needs to support, and from the service type, the broadcast multicast service includes streaming media types, such as audio broadcast, live television broadcast, etc.; from a data type perspective, including, for example, data files for software upgrades; from a public safety class, information such as earthquake, tsunami, or public health safety is included. Different services correspond to different time delay requirements and have large and small data rates, and compared with the system broadcasting information, the method has the characteristics of different service quality requirements, different rates and the like, and particularly needs higher service rate and transmission quality requirements for television live broadcast services. In addition, in the transmission mode, the transmission of the broadcast multicast ancestral includes two modes of PTP and PTM, wherein the PTM mode refers to that the base station establishes a radio bearer, and single-point transmission is performed, and a plurality of terminals simultaneously receive, and the mode is suitable for receiving broadcast multicast service data by a plurality of terminals (such as more than 10 terminals); the PTP mode refers to a mode that the base station establishes a radio bearer for each terminal, and the mode is suitable for a small number of users to receive broadcast multicast service data.

In addition, in the NR system, one cell supports multi-beam (beam) transmission, and when a terminal and a base station transmit control channel and traffic channel data, a beam to be explicitly transmitted is required so that a receiving end can receive the data. When the base station transmits a physical downlink control channel (physical downlink control channel, PDCCH) as when the terminal is in the coverage area of SSB1, its transmission beam and SSB1 remain identical (i.e., PDCCH and SSB1 have a Quasi Co-Location (QCL) relationship, i.e., the channel characteristics on the transmit PDCCH antenna port symbol can be deduced from the antenna port transmitting SSB 1). When a terminal moves from the coverage area of SSB1 to the coverage area of SSB2, the base station needs to adjust its transmission beam to the direction of SSB2 (i.e., PDCCH and SSB2 have QCL relationship) when transmitting PDCCH. This QCL relationship of PDCCH and certain SSB adopts a transmission configuration indication (Transmission Configuration Indication, TCI) state, and when the terminal moves from SSB1 to SSB2, the base station transmits TCI state indication information through a medium access control-control element (MAC-CE) message.

In addition, when the switching between PTP and PTM transmission modes occurs, the conventional process of PTP to PTM switching indication and PTM establishment is: the transmitting node indicates a transmission mode, namely a PTM mode, in a Multicast Control Channel (MCCH); then the receiving node (terminal) releases the PTP link and indicates PTM configuration information on the MCCH; and then the sending node receives the multicast broadcast service data according to the PTM configuration information. The traditional procedure for switching indication from PTM to PTP and establishing PTP is as follows: the transmitting node indicates a transmission mode, namely a PTP mode, in the MCCH; then the receiving node releases the PTM configuration information; and then if the idle state is the idle state, carrying out a random process to enter a link state, establishing PTP connection, and establishing data transmission.

Specifically, when switching between MCCH indication PTP and PTM is used, a field is used to indicate the transmission mode of a specific broadcast multicast service, for example, when PTP is indicated, it indicates that a specific broadcast multicast service in the cell adopts PTP mode; when a PTM is indicated, it means that a specific broadcast multicast service in the cell adopts the PTM method.

But only the MCCH is used to indicate PTP/PTM switch, there are the following drawbacks: first, the switching instruction is delayed, and the requirement of switching transmission modes cannot be responded quickly. The main application scenario of PTP/PTM switching is to make the resource utilization ratio best. On the one hand, when the number of users receiving broadcast multicast service and the channel change, a handover is required, and when the load of the base station communication changes, a handover may also be required. The response time of the MCCH depends on the content modification period of the MCCH configuration, the more common configuration period is hundred milliseconds or 1-2 seconds, and the time delay is larger (the shorter MCCH content modification period is required to be configured, the terminal is required to continuously receive the MCCH data, namely, the resources of an air interface are wasted, and the terminal is not beneficial to saving electricity). And secondly, the switching instruction taking the cell as a unit causes waste of air interfaces. For example, when a plurality of terminals satisfy PTM in the coverage area of SSB1, PTM is used in the coverage area of all SSBs in the cell, and this operation causes a waste of resources. For this, the invention provides the following examples:

As shown in fig. 1, the method for switching transmission modes of broadcast multicast in the embodiment of the present invention includes the following steps:

step 101: and acquiring a target transmission mode of the broadcast multicast service and acquiring configuration information of the target transmission mode.

Specifically, the target transmission mode of the broadcast multicast service is PTP mode or PTM mode.

In addition, when the terminal acquires the target transmission mode of the broadcast multicast service, the acquisition mode of the target transmission mode may include any one of the following:

the method comprises the steps of obtaining a target transmission mode indicated by a base station in DCI, obtaining a target transmission mode indicated by the base station in MCCH, obtaining a target transmission mode indicated by the base station through MAC-CE, and obtaining the target transmission mode through a preset timer.

The target transmission mode of the broadcast and multicast service can be indicated through DCI, MAC-CE and MCCH of a control channel or through a preset timer, thereby avoiding the delay of transmission mode switching indication and enabling the request of switching the transmission mode of the broadcast and multicast service to be responded quickly.

In addition, the specific configuration information of the target transmission mode may include any one of the following: control channel detection timing, PDSCH rate matching information, and partial Bandwidth (BWP) information.

Step 102: and receiving the broadcast multicast service based on the configuration information of the target transmission mode.

In this step, specifically, after the configuration information of the target transmission mode is obtained, the broadcast multicast service may be received directly based on the configuration information of the target transmission mode.

For example, if the target transmission mode is a PTP mode, the broadcast multicast service is received based on the configuration information of the PTP mode, and if the target transmission mode is a PTM mode, the broadcast multicast service is received based on the configuration information of the PTM mode, thereby ensuring the correct receiving process of the broadcast multicast service.

In this way, the embodiment determines the target transmission mode of the broadcast multicast service by adopting the mode of DCI, MCCH, MAC-CE or the preset timer, namely, switches the PTM/PTP mode, so that the switching of the transmission mode of the broadcast multicast service is more flexible, and the air interface resource is effectively saved.

Further, each acquisition mode of the target transmission mode is described below.

First, a method for indicating a target transmission method by DCI:

the method may include any one of the following modes when the terminal obtains the target transmission mode indicated by the base station in the DCI:

(1) And receiving first indication information sent by the base station through a special DCI signaling, wherein the first indication information comprises a broadcast multicast service identification number and identification information of a target transmission mode.

The dedicated DCI refers to one DCI format for indicating a broadcast/multicast service transmission mode, and is configured with a special Radio Network Temporary Identifier (RNTI) to distinguish existing other DCI formats, such as a defined mode switch-radio network temporary identifier (ms-RNTI). At this time, the sending end uses ms-RNTI to scramble DCI transmitted on the PDCCH channel, the receiving end uses ms-RNTI to detect and descramble PDCCH, and the terminal can obtain indication information of a target transmission mode to perform PTP/PTM conversion.

In addition, the dedicated DCI format includes a broadcast multicast service identification field and an identification field of a target transmission mode, where the broadcast multicast service identification field is used to identify a broadcast multicast service identification number, and the identification field of the target transmission mode is used to identify the target transmission mode, for example, a 0-identification PTM mode, a 1-identification PTP mode, or a 1-identification PTM mode, and a 0-identification PTP mode are not specifically limited herein.

In addition, specifically, when the broadcast multicast service is at least two services configured based on a cell or SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of the broadcast multicast service.

For example, broadcast multicast service may be identified with a Temporary Mobile Group Identity (TMGI), and the configuration order may be: in the dedicated DCI signaling, each bit in the bitmap corresponds to a target transmission mode of a broadcast multicast service, that is, the bitmap indicates the transmission mode of the corresponding TMGI, and each bit in the bitmap corresponds to the configured broadcast multicast service, as shown in fig. 2. In fig. 2, the target transmission modes of the broadcast multicast service identified as TMGI-1 to TMGI-12 are indicated by bitmap indication modes, wherein 0 indicates PTM mode and 1 indicates PTM mode.

In addition, specifically, when the broadcast multicast service is at least two services configured based on a cell or SSB coverage area, and the number of bits carried by the dedicated DCI signaling is smaller than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used for indicating a target transmission mode of the broadcast multicast service in the same transmission mode.

For example, if M broadcast multicast services that need to be indicated by the dedicated DCI signaling are configured in total, the maximum number of bits carried by the dedicated DCI signaling is N, and M > N, the packet manner adopted at this time may be:

dividing M into L groups, each of L-1 groups containing K services

The L group contains (M-K (L-1)) services, wherein +.>

Representing an upward rounding. Furthermore, in an N-bit bitmap, +.>

And the packet number is represented, and K represents transmission modes corresponding to K services.

In addition, after the base station configures the values of M and N, the method for determining the values of L and K by the terminal and the base station is as follows: satisfy the following requirements

In the case where the equation is true, the L is takenThe smallest value in the set {1,2,3 … N-1 }. Examples are as follows:

for example, when n=16, m < =16, l=1, the number of packets is 1, and the indication is a special case where no packets are performed.

As another example, as shown in fig. 3, when n=16 and m=25, l=2 and the number of packets is 2, among the 16 bits of the dedicated DCI, 1 bit indicates the group number, and the remaining 15 bits indicate the transmission mode of the corresponding broadcast multicast service by using a bitmap; that is, in the bitmap indicating information in fig. 3, the transmission mode of the broadcast multicast service group with the group number of 0 is indicated.

As another example, as shown in fig. 4, when n=16 and m=40, l=3 and the number of packets is 3, 2 bits of the 16 bits of the dedicated DCI represent the group number, and the remaining 14 bits indicate the transmission mode of the corresponding broadcast multicast service by using a bitmap; that is, in the group bitmap indication information in fig. 4, the transmission mode of the group broadcast multicast service with the group number of 2 (corresponding to 01) is indicated.

In this way, the target transmission mode of the broadcast multicast service is indicated by the bitmap mode, so that the cost of the special DCI is reduced.

(2) And receiving second indication information sent by the base station through the DCI of the broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Specifically, when the second indication information is indicated by the DCI of the broadcast multicast, the second indication information is indicated in the DCI of the unicast schedule when the current transmission mode of the broadcast multicast service is the PTP mode, and the second indication information is indicated in the DCI of the multicast schedule when the current transmission mode of the broadcast multicast service is the PTM mode.

In addition, specifically, the manner in which the DCI of the broadcast multicast contains the second indication information may include:

an indication field is newly added in DCI of the broadcast multicast, and the indication field contains second indication information; alternatively, the meaning of the target original field in the DCI of the broadcast multicast is redefined as the second indication information.

Specifically, when the indication field is newly added to the DCI, the content information of the original DCI needs to be added, and the total size (size, sum of bits of all information fields) of the relevant DCI increases. For example, adding 1 bit in DCI indicates second indication information (e.g., 0 indicates that the current mode is kept unchanged, 1 indicates that the transmission mode is converted, or vice versa), that is, indicates that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode, and the implementation process of the mode is simple.

In addition, specifically, the original target field includes any one of the following: DCI indication format, PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication (e.g., using a combination that is not used in frequency domain resource indication, e.g., all "1"), time domain resource allocation indication. The original meaning of the original field of any item label is redefined as second indication information by modifying the original meaning of the original field of the target, so that the terminal is facilitated to detect the channel, and the requirement of the channel detection capability is reduced.

In this way, the indication of the target transmission scheme by the DCI scheme is achieved by either one of the above two schemes.

In addition, when the target transmission mode is the PTM mode, the DCI for indicating the target transmission mode further includes carrier indication information and/or BWP information. This enables the terminal to receive the corresponding PDSCH according to the carrier indication information in the DCI when the PDSCH for transmitting the broadcast multicast service and the carrier transmitted by the PDCCH are on different carriers or BWP.

Secondly, the method for indicating the target transmission method through the MCCH is as follows:

when the terminal obtains the target transmission mode indicated by the base station in the MCCH, the terminal may receive third indication information periodically sent by the base station through the MCCH.

Specifically, the third indication information includes a target transmission mode of the broadcast multicast service, carrier or cell information for transmitting the broadcast multicast service, and an index number of the SSB when the broadcast multicast service is transmitted by using at least one SSB coverage area as a unit.

For example, the third indication information includes the following contents:

tmgi=1, indicating that the broadcast multicast service identification number is 1;

cell id=3, indicating that the Cell identification number is 3;

SSB index=0, mode=ptp, indicating that when the index number of the SSB coverage area is 0, the target transmission mode is the PTP mode;

SSB index=1, mode=ptm, when the index number indicating the SSB coverage area is 1, the target transmission mode is the PTM mode;

SSB index=2, mode=ptm, when the index number indicating the SSB coverage area is 2, the target transmission mode is the PTM mode;

SSB index=3, mode=ptp, and when the index number indicating the SSB coverage area is 3, the target transmission mode is PTP mode.

The above example defines that the broadcast multicast service identifier 1 is sent in the cell 3, where the cell 3 is sent by using a PTP transmission mode under the SSB0, the cell 3 is sent by using a PTM transmission mode under the SSB1, the cell 3 is sent by using a PTM transmission mode under the SSB2, and the cell 3 is sent by using a PTP transmission mode under the SSB 3.

In this way, the MCCH periodically indicates the target transmission mode, so that the terminal newly accessed to receive the broadcast multicast service can acquire the transmission mode of the specific broadcast multicast service.

Thirdly, the method for indicating the target transmission method by the MAC-CE is as follows:

when the terminal obtains the target transmission mode indicated by the base station through the MAC-CE, the terminal may receive fourth indication information sent by the base station through the MAC-CE.

Specifically, the fourth indication information includes a control resource aggregate identifier and a Transmission Configuration Indication (TCI) status identifier, wherein the TCI status identifier is associated with the SSB index number.

Specifically, for the manner of indicating the target transmission manner through the MAC-CE, the main application scenario is that the terminal moves from one SSB coverage area to another SSB coverage area. When the terminal moves from one SSB coverage area (e.g., SSB-index=1) to another SSB coverage area (e.g., SSB-index=2), the destination transmission mode of the broadcast multicast service may be indicated by the fourth indication information sent by the MAC-CE. At this time, the contents of the fields of the MAC-CE are as follows:

when detecting that the SSB index associated with the resource set (the control resource set of PTP or PTM) of the control channel for transmitting the broadcast multicast data is changed, periodically indicating the broadcast multicast transmission mode corresponding to the SSB coverage area based on the MCCH, so that a certain SSB index has the corresponding broadcast multicast transmission mode, and the terminal can acquire the target transmission mode of the broadcast multicast service of the corresponding SSB through the changed SSB index number. That is, when the broadcast multicast transmission method of the SSB corresponding to the SSB before the SSB index conversion is the PTM method and the broadcast multicast transmission method of the SSB corresponding to the SSB after the SSB index conversion is PTP, switching to the PTP mode is indicated.

Fourth, the method for indicating the target transmission method by the preset timer is as follows:

when the terminal obtains the target transmission mode through the preset timer, the terminal may determine the target transmission mode of the broadcast multicast service as another transmission mode except the current transmission mode, i.e. switch the transmission modes when the terminal does not receive the DCI of the broadcast multicast in the timing duration of the preset timer.

Specifically, when the service transmission of the broadcast and multicast is in a certain mode, the terminal detects the corresponding control channel on the detection opportunity of the corresponding mode, and when no control information of the broadcast and multicast is received within a certain period of time (possibly the base station sends a notification, but the terminal does not detect the information), the transmission mode of the broadcast and multicast is considered to be changed, and the terminal switches to another transmission mode to detect the corresponding control channel on the detection opportunity of the other transmission mode.

The indication of the target transmission mode is performed through the preset timer, so that the transmission mode can be switched under the condition that the terminal cannot receive the information.

In this way, the above embodiment realizes the indication of the target transmission mode of the broadcast multicast service by means of DCI, MCCH, MAC-CE or a preset timer, that is, the switching indication of the transmission mode of the broadcast multicast service is realized, which is equivalent to the prior art, so that the switching of the transmission mode is more flexible, and the air interface resource is effectively saved.

When the terminal is in a connection state, the terminal measures adjacent SSB and reports the measurement result to the base station, and the base station determines the moment of SSB switching of the terminal, thereby ensuring that PTP/PTM switching is effectively performed in a specific SSB coverage area. When the terminal is in idle state, the terminal can only receive broadcast multicast service sent by PTM mode, when SSB coverage area is changed due to mobile, SSB coverage area is selected according to mobility measurement result.

Further, in this embodiment, when acquiring the target transmission configuration information, before acquiring the target transmission mode of the broadcast multicast service, the configuration information of the PTP mode and the configuration information of the PTM mode sent by the base station through the higher layer signaling may be received; or after the target transmission mode of the broadcast multicast service is acquired, receiving the configuration information of the target transmission mode sent by the base station.

That is, the base station may send configuration information of PTM and PTP to the terminal in advance through a high layer signaling, and directly apply the configuration information of PTM or PTP after the terminal obtains the target transmission mode of the broadcast multicast service, without obtaining from the base station again, so that the delay of transmission mode conversion can be further reduced. Of course, the base station may also receive the configuration information of the target transmission mode sent by the base station after obtaining the target transmission mode of the broadcast multicast service, so as to avoid receiving the configuration information of the invalid transmission mode.

In addition, the configuration information specifically includes control channel detection timing and/or rate matching information of PDSCH of the corresponding transmission mode.

In addition, it should be noted that the control channel detection timing is configured based on a single broadcast multicast service or a group of broadcast multicast services; the rate matching information of the PDSCH corresponding to the PTM scheme is configured based on a group of terminals.

Furthermore, in this embodiment, when the target transmission mode is a PTP mode and the terminal is in an idle state, the terminal may receive a random access channel RACH resource configured by the base station to establish PTP; or when the target transmission mode is a PTP mode and the terminal is in an idle state, the terminal can generate a random number, and when the random number is larger than a preset access factor, the random access process is performed.

It should be noted that the RACH resource is an additional RACH resource, and may be configured by broadcasting or multicasting a message, so that the terminal may initiate a random access procedure on the additionally configured RACH resource, thereby avoiding the problem of instantaneous network congestion.

Thus, the problem of instant network blocking caused when the transmission mode of the broadcast and multicast service is PTP mode and a large number of idle terminals need to perform random access process is avoided.

Further, in this embodiment, the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas. The indication granularity of the transmission mode is SSB coverage area level, and compared with the cell level, the indication granularity of the transmission mode is finer, so that air interface resources are further saved.

According to the switching method of the broadcast multicast service transmission mode, the target transmission mode of the broadcast multicast service is determined by adopting the mode of DCI, MCCH, MAC-CE or a preset timer, namely the switching of the PTM/PTP mode is performed, so that the switching of the transmission mode of the broadcast multicast service is more flexible, and the air interface resource is effectively saved.

As shown in fig. 5, the method for switching the broadcast multicast service transmission mode applied to the base station in the embodiment of the present invention includes the following steps:

step 501: and sending the target transmission mode of the broadcast multicast service to the terminal, and sending configuration information of the target transmission mode to the terminal.

In this step, the base station sends the target transmission mode of the broadcast multicast service to the terminal, and sends the configuration information of the target transmission mode to the terminal, so that the terminal can receive the broadcast multicast service based on the configuration information of the target transmission mode.

In addition, the mode of transmitting the target transmission mode of the broadcast multicast service to the terminal includes any one of the following modes: the target transmission mode is sent to the terminal through DCI, the target transmission mode is sent to the terminal through MCCH, and the target transmission mode is sent to the terminal through MAC-CE.

The base station can indicate the target transmission mode of the broadcast multicast service through DCI, MAC-CE or MCCH, thereby avoiding the delay of transmission mode switching indication and enabling the request of switching the transmission mode of the broadcast multicast service to be responded quickly.

In addition, the configuration information of the target transmission mode may include control channel detection timing and/or rate matching information of PDSCH.

In this way, the embodiment uses DCI, MCCH or MAC-CE to indicate the target transmission mode of the broadcast multicast service, namely switches PTM/PTP modes, so that the switching of the transmission mode of the broadcast multicast service is more flexible, and the air interface resources are effectively saved.

Further, each indication mode of the target transmission mode is described below.

First, a method for indicating a target transmission method by DCI:

When the base station sends the target transmission mode to the terminal through the DCI, the method may include any one of the following modes:

(1) And sending first indication information through a special DCI signaling, wherein the first indication information comprises a broadcast multicast service identification number and identification information of the target transmission mode.

Specifically, when the broadcast multicast service is at least two services configured based on a cell or SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of the broadcast multicast service.

(2) And sending second indication information through DCI of the broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Specifically, the manner in which the DCI of the broadcast multicast contains the second indication information may include: an indication field is newly added in DCI of the broadcast multicast, and the indication field contains second indication information; alternatively, the meaning of the target original field in the DCI of the broadcast multicast is redefined as the second indication information.

In addition, specifically, the original target field includes any one of the following: DCI indication format, PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication.

Note that, when the target transmission scheme is the PTM scheme, the DCI for indicating the target transmission scheme further includes carrier indication information.

when the target transmission mode is sent to the terminal through the MCCH, the third indication information may be periodically sent through the MCCH.

The third indication information includes a target transmission mode of the broadcast multicast service, carrier or cell information for transmitting the broadcast multicast service, and an index number of the SSB when the broadcast multicast service is transmitted by taking at least one SSB coverage area as a unit.

when the base station sends the target transmission mode to the terminal through the MAC-CE, the base station can send fourth indication information through the MAC-CE.

Wherein the fourth indication information comprises a control resource aggregate identifier and a transmission configuration indication, TCI, status identifier, wherein the TCI status identifier is associated with an SSB index number.

In this way, the above embodiment realizes the indication of the target transmission mode of the broadcast multicast service by the DCI, MCCH or MAC-CE mode, that is, the switching indication of the transmission mode of the broadcast multicast service, which is equivalent to the prior art, so that the switching of the transmission mode is more flexible, and the air interface resource is effectively saved.

The specific content of any of the foregoing embodiments may be referred to the relevant content of the terminal side method embodiment, and will not be described in detail herein.

Further, in this embodiment, when the configuration information of the target transmission mode is sent to the terminal, before the target transmission mode of the broadcast multicast service is sent to the terminal, the configuration information of the PTP mode and the configuration information of the PTM mode may be sent to the terminal through a high-layer signaling; or after the target transmission mode of the broadcast multicast service is sent to the terminal, the configuration information of the target transmission mode is sent to the terminal; the configuration information includes control channel detection time of corresponding transmission mode and/or rate matching information of physical downlink shared channel PDSCH.

Furthermore, in this embodiment, when the target transmission mode is a PTP mode and the terminal is in an idle state, the base station may further configure the RACH resource of the random access channel used by the terminal to establish PTP.

The specific content of the above embodiment may refer to the related content of the method embodiment at the terminal side, and will not be described herein.

According to the switching method of the broadcast multicast service transmission mode, the indication of the target transmission mode of the broadcast multicast service is performed by adopting the DCI, MCCH or MAC-CE mode, so that the switching of the transmission mode of the broadcast multicast service is more flexible, and the air interface resource is effectively saved.

The present invention will be specifically described with reference to the following examples.

First embodiment:

in this embodiment, the target transmission mode of the broadcast multicast service is indicated through the dedicated DCI signaling, which specifically includes the following steps:

step 1, a base station indicates a target transmission mode of a broadcast multicast service through a special DCI signaling.

Specifically, the dedicated DCI signaling refers to a DCI format for indicating a broadcast multicast service transmission mode, where the format may be configured with a special Radio Network Temporary Identifier (RNTI) to distinguish existing other DCI formats, such as defining a mode conversion radio network temporary identifier (ms-RNTI), where a transmitting end (may be a base station) uses the ms-RNTI to scramble DCI transmitted on a PDCCH channel, and a receiving end (may be a terminal) uses the ms-RNTI to perform PDCCH detection and descrambling, so as to obtain PTP/PTM conversion information. Specifically, the content of the dedicated DCI signaling format includes the following:

a broadcast multicast service identification field for indicating a broadcast multicast service identification number;

the identification field of the target transmission mode, which is used to identify the target transmission mode, may be, for example, "0" to identify the PTM mode, "1" to identify the PTP mode, or "1" to identify the PTM mode, "0" to identify the PTP mode, which is not specifically limited herein.

Further, in order to reduce the overhead of the dedicated DCI signaling, a bitmap may be used to indicate a target transmission mode of the broadcast multicast service, where a specific indication mode is as follows:

when the broadcast multicast service is at least two services in the own cell or a coverage area of a certain SSB configured by the base station through a broadcast channel (BCCH) or a Multicast Control Channel (MCCH) or RRC signaling, the services may be identified by a Temporary Mobile Group Identifier (TMGI), and the configuration sequence may be: in the dedicated DCI signaling, each bit in the bitmap corresponds to a target transmission mode of a broadcast multicast service, that is, the bitmap indicates the transmission mode of the corresponding TMGI, and each bit in the bitmap corresponds to the configured broadcast multicast service, as shown in fig. 2. In fig. 2, 0 denotes a PTM scheme, and 1 denotes a PTM scheme.

In addition, when the number of bits carried by the dedicated DCI signaling is less than the configured total broadcast multicast service number, a packet indication manner may be adopted, that is, at least two sets of bitmap indication information are included in the dedicated DCI signaling, and each set of bitmap indication information is used to indicate a target transmission manner of a broadcast multicast service in the same transmission manner. For example, if M broadcast multicast services that need to be indicated by the dedicated DCI signaling are configured in total, the maximum number of bits carried by the dedicated DCI signaling is N, and M > N, the packet manner adopted at this time may be:

Dividing M into L groups, each of L-1 groups containing K services

The L-th group contains (M-K (L-1)) traffic. Furthermore, in an N-bit bitmap, +.>

Represents a packet number, K represents K servicesCorresponding transmission modes.

When the equation is satisfied, L is the smallest value in the array {1,2,3 … N-1 }. Examples are as follows:

In this way, by the above grouping method, when the value of N is determined, the base station and the terminal can adaptively perform grouping according to the change of the value of M to represent the target transmission method of the broadcast multicast service.

And 2, the terminal acquires configuration information of a transmission mode of the corresponding broadcast multicast service.

Specifically, the configuration information includes control channel detection timing and/or rate matching information of PDSCH of the corresponding transmission mode.

The control channel detection timing refers to the time (time slot or symbol) at which the terminal detects the control channel when receiving the broadcast multicast service. The base station configures the detection time according to the service characteristics, so that the terminal can receive the control channel at a specific time, and the effect of saving electricity is achieved. It should be noted that the detection opportunity may be configured based on a single service (e.g., associated with the TMGI) or may be configured based on a group of services. Of course, the configuration information thereof may be configured through RRC signaling or broadcast signaling or multicast signaling.

The rate matching information of the PDSCH refers to that when the base station transmits PDSCH data of scheduling broadcast multicast, resource units which cannot be occupied by part of PDSCH are subtracted from the scheduled frequency domain or time resource, so that the flexibility of base station call can be ensured. It should be noted that, these resources (time information and frequency domain information) that cannot be occupied by call are configured through RRC signaling or broadcast signaling or multicast signaling. In addition, the rate matching information of the PTM is configured separately from the rate matching information of the PTP schedule, i.e. the configuration is valid from a group of terminals.

In addition, the step 2 may be performed after the step 1, that is, the base station sends the configuration information of the target transmission mode according to the target transmission mode of the broadcast multicast service. Of course, this step may also be performed before step 1, that is, the base station configures both the PTP mode configuration information and the PTM mode configuration information to the terminal, and the terminal selects the target transmission mode configuration information according to the target transmission mode.

Step 3: and receiving the broadcast multicast service based on the configuration information of the target transmission mode.

Specifically, the terminal may detect the scheduling signaling DCI according to the configuration information of the target transmission mode, and receive PDSCH data on the carrier or other carriers according to the DCI indication.

In addition, the terminal adopts different receiving processes aiming at different transmission modes, and the specific receiving processing modes are as follows:

when the target transmission mode is the PTM mode, the terminal starts to detect the control channel on the detection time configured by the PTM mode. When the corresponding scheduling information is detected, the DCI analysis is performed in a group scheduling format, if the DCI contains a rate matching instruction, the rate matching information configured according to the PTM mode is analyzed, and the detection of the control channel on the detection occasion configured in the PTP mode is stopped.

When the target transmission mode is PTP, the terminal starts to detect the control channel at the detection time configured by the PTP mode, when the corresponding scheduling information is detected, DCI analysis is performed in a unicast scheduling format, if the DCI contains a rate matching instruction, the rate matching information configured by the PTP mode is analyzed, and the detection of the control channel at the detection time configured by the PTM mode is stopped.

Specifically, in order to increase the flexibility of base station scheduling, when the target transmission mode is the PTM mode, the DCI of the group scheduling information includes carrier indication information (i.e., the carriers sent by the PDSCH and the PDCCH are on different carriers), and at this time, the terminal receives the corresponding PDSCH according to the configured carrier indication information.

Second embodiment:

in this embodiment, the DCI signaling scheduled by the broadcast multicast indicates the target transmission mode of the broadcast multicast service, which specifically includes the following steps:

step 1, a base station indicates a target transmission mode of a broadcast multicast service through DCI signaling of broadcast multicast scheduling.

Specifically, when the DCI support of broadcast multicast indicates that the transmission mode of the broadcast multicast service is changed, any one of the following modes may be adopted:

firstly, an indication field for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode is added.

In this way, the content information of the original DCI needs to be increased, and the total size (size, sum of bits of all information fields) of the relevant DCI increases. For example, adding 1 bit to DCI indicates that a PTP or PTM mode switch is to be performed. The implementation process of the method is simple.

And redefining the meaning of the original target field in the DCI of the broadcast multicast as second indication information, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

In this case, the meaning of the content of the original DCI is modified, and the total SIZE of the DCI is unchanged. The method is beneficial to the terminal to detect the channel and reduces the requirement on the channel detection capability.

Specifically, the original target field includes any one of the following:

DCI indication format, PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication.

Specifically, as shown in the following table, the signaling content of the broadcast multicast schedule is shown in the following table:

/>

specifically, when the switching of the transmission scheme is indicated by a specific combination of the fields of the "frequency domain resource allocation indication" or the "time domain resource allocation indication", the switching of the transmission mode of the broadcast-multicast service may be indicated when the frequency domain resource allocation indication is all 1, and the switching of the transmission mode of the broadcast-multicast service may be indicated when the time domain resource allocation indication is all 0, which is not particularly limited herein.

In addition, in order to increase the flexibility of base station scheduling, when the target transmission mode is the PTM mode, the DCI of the group scheduling information includes carrier indication information (i.e., the carriers sent by the PDSCH and the PDCCH are on different carriers), and at this time, the terminal receives the corresponding PDSCH according to the configured carrier indication information. Specifically, the carrier indication information may also be indicated in two ways, one is a newly added information field, and the other is the meaning of the original field in the redefined DCI.

Here, the description of the indication information of the redefined DCI original field indicating the carrier is as follows:

in the above expression, a DCI format indicator (DCI formats) of 1 bit length indicates whether uplink or downlink scheduling is performed when DCI is non-broadcast multicast (herein, non-broadcast multicast DCI refers to existing scheduling signaling format DCI, such as unicast data scheduled by C-RNTI, CS-RNTI, and MCS-RNTI as scrambling codes). When the DCI is broadcast multicast (here, broadcast multicast DCI is broadcast or multicast data scheduled for a channel scrambling code using "different from existing unicast RNTI", e.g., G-RNTI), there is only downlink scheduling, and thus the bit information may be used to indicate carrier indication information.

In addition, as in the above table, a 2-bit PUCCH power control parameter is used to indicate an uplink power parameter when DCI is non-broadcast multicast. When the DCI is broadcast multicast, the power control parameter needs to be performed in other manners (e.g., based on downlink path loss of each terminal), and the power control parameter of the uplink PUCCH may be omitted, which may be used to indicate carrier indication information.

Step 2: the terminal obtains configuration information of the target transmission mode.

This step is the same as step 2 of the first embodiment, and will not be described in detail here.

Furthermore, it should be noted that, when the transmission mode of broadcast multicast is switched from PTM to PTP, if there are a large number of terminals in idle state to establish connection, that is, there are a large number of terminals performing random access procedure, this may cause instant congestion of the network, and this embodiment may solve the problem by:

firstly, additional RACH resources are configured, that is, when the target transmission mode is the PTP mode and the terminal is in an idle state, RACH resources configured by the base station for establishing PTP may be received. Specifically, some additional RACH access resources are configured through a broadcast or multicast message, when the network instructs to switch to PTP, these RACH resources are indicated to be effective at the same time, and some or all terminals need to initiate random access on the additional configured PRACH resources due to the terminals that establish a connection when receiving the broadcast multicast service. To reduce resource waste, the base station indicates an additional RACH resource validity period, i.e., during the validity period, the terminal may initiate random access using the additionally configured RACH resources. The additional RACH resources may be RACH resources configured independently, or RACH resources configured in the original but MASK-off state by the base station.

Setting an access factor, namely when the target transmission mode is a PTP mode and the terminal is in an idle state, generating a random number by the terminal, performing a random access process when the random number is larger than a preset access factor, and otherwise, waiting for a certain period of time and then starting random access.

Step 3: and receiving the broadcast multicast service according to the configuration information of the target transmission mode.

Specifically, the terminal detects the scheduling signaling DCI according to the configuration information of the target transmission mode, and receives PDSCH data on the carrier or other carriers according to the DCI indication.

When the DCI analysis result is that PTP occurs, the terminal starts to detect the control channel at the detection timing configured for the PTP method, and stops detecting the control channel at the detection timing configured for the PTM method.

Embodiment III:

in this embodiment, the target transmission mode of the broadcast multicast service is indicated by a preset timer.

Specifically, the target transmission mode of the broadcast multicast service indicated based on the preset timer is a supplementary mode to the first embodiment and the second embodiment, and can be used together with the first embodiment and the second embodiment. When the terminal for some reason fails to detect the target transmission mode of the broadcast multicast service (for example, the channel quality is poor, the related information cannot be detected correctly, or the terminal receives the service with higher priority because of the priority problem), the indication of the target transmission mode is performed based on the preset timer.

That is, when the service transmission of the broadcast multicast is in a certain mode, the terminal detects the corresponding control channel on the detection opportunity of the corresponding mode, when no control information of the broadcast multicast is received within the timing duration of the preset timer, the transmission mode of the broadcast multicast is considered to be changed (possibly that the base station sends a notification, but the terminal does not detect), and the terminal switches to the detection opportunity of another transmission mode to detect the corresponding control channel.

For example, at a certain moment, the base station instructs a specific broadcast multicast service to send in a PTM manner, the terminal detects a broadcast multicast control channel on a detection occasion corresponding to the PTM manner, starts a preset timer (for example, the duration of the timer is 1 second), and performs the following procedures:

before the timeout of the preset timer, if the control information of the broadcast multicast is received, restarting the timing, and continuously detecting the control channel of the broadcast multicast on the detection opportunity of the PTM by the terminal;

if the preset timer is overtime (i.e. no control information of broadcast multicast is received within 1 s), the target transmission mode of the broadcast multicast service is determined to be a PTP mode, and the terminal receives the broadcast multicast service in the PTP mode.

Thus, the invention realizes flexible switching of the broadcast multicast transmission mode through the embodiment.

In addition, as shown in fig. 6, a block diagram of a switching device applied to a broadcast multicast transmission mode of a terminal in an embodiment of the present invention is shown, where the device includes:

an obtaining module 601, configured to obtain a target transmission mode of a broadcast multicast service, and obtain configuration information of the target transmission mode;

a receiving module 602, configured to receive the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

Optionally, the acquiring the target transmission mode indicated by the base station in the downlink control information DCI includes:

receiving first indication information sent by a base station through a special DCI signaling, wherein the first indication information comprises a broadcast multicast service identification number and identification information of the target transmission mode; or alternatively, the process may be performed,

And receiving second indication information sent by the base station through the DCI of the broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Optionally, when the broadcast multicast service is at least two services configured based on a coverage area of a cell or a synchronization signal block SSB, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of the broadcast multicast service.

Optionally, when the broadcast multicast service is at least two services configured based on a cell or a coverage area of a synchronization signal block SSB, and the number of bits carried by the dedicated DCI signaling is smaller than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used for indicating a target transmission mode of the broadcast multicast service in the same transmission mode.

Optionally, the manner in which the DCI of the broadcast multicast includes the second indication information includes:

an indication field is newly added in the DCI of the broadcast multicast, and the indication field contains the second indication information; or alternatively, the process may be performed,

And redefining the meaning of the original field of the target in the DCI of the broadcast and multicast as the second indication information.

Optionally, the obtaining the target transmission mode through a preset timer includes:

and when the terminal does not receive the DCI of the broadcast multicast in the timing duration of the preset timer, determining the target transmission mode of the broadcast multicast service as another transmission mode except the current transmission mode.

It should be noted that, the device provided in this embodiment can implement all the method steps that can be implemented by the terminal side method embodiment, and can achieve the same technical effects, and will not be described herein again.

In addition, as shown in fig. 7, a block diagram of a switching device applied to a broadcast multicast transmission mode of a base station in an embodiment of the present invention is shown, where the device includes:

a sending module 701, configured to send a target transmission mode of a broadcast multicast service to a terminal, and send configuration information of the target transmission mode to the terminal, so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

Optionally, the sending the target transmission mode to the terminal through downlink control information DCI includes:

transmitting first indication information through a special DCI signaling, wherein the first indication information comprises a broadcast multicast service identification number and identification information of the target transmission mode; or alternatively, the process may be performed,

and sending second indication information through DCI of broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

It should be noted that, the device provided in this embodiment can implement all the method steps that can be implemented by the base station side method embodiment, and can achieve the same technical effects, and will not be described herein.

Fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention, as shown in fig. 8, the terminal 800 may include: at least one processor 801, memory 802, at least one network interface 804, and other user interfaces 803. The various components in the mobile terminal 800 are coupled together by a bus system 805. It is appreciated that the bus system 805 is used to enable connected communications between these components. The bus system 805 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity of illustration, the various buses are labeled as bus system 805 in fig. 8.

The user interface 803 may include, among other things, a display, a keyboard, or a pointing device, such as a mouse, a trackball (trackball), a touch pad, or a touch screen.

It will be appreciated that the memory 802 in embodiments of the invention can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). The memory 802 of the systems and methods described in the various embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.

In some implementations, the memory 802 stores elements, executable modules or data structures, or a subset thereof, or an extended set thereof, such as: an operating system and application programs.

The operating system includes various system programs, such as a framework layer, a core library layer, a driving layer, and the like, and is used for realizing various basic services and processing hardware-based tasks. Applications, including various applications such as Media Player (Media Player), browser (Browser), etc., are used to implement various application services. The program for implementing the method of the embodiment of the invention can be contained in an application program.

In the embodiment of the present invention, the processor 801 is configured to, by calling a computer program or an instruction stored in the memory 802, specifically, a computer program or an instruction stored in an application program:

acquiring a target transmission mode of a broadcast multicast service and acquiring configuration information of the target transmission mode; receiving the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

the target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; the acquisition mode of the target transmission mode comprises any one of the following: the method comprises the steps of obtaining the target transmission mode indicated by a base station in downlink control information DCI, obtaining the target transmission mode indicated by the base station in a multicast control channel MCCH, obtaining the target transmission mode indicated by the base station through a media access control-control unit MAC-CE, and obtaining the target transmission mode through a preset timer.

The method disclosed in the above embodiment of the present invention may be applied to the processor 801 or implemented by the processor 801. The processor 801 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuitry in hardware in the processor 801 or by instructions in software. The processor 801 described above may be a general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory 802, and the processor 801 reads information in the memory 802 and, in combination with its hardware, performs the steps of the above method.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For a hardware implementation, the processing units may be implemented within one or more application specific integrated circuits (Application Specific Integrated Circuits, ASIC), digital signal processors (Digital Signal Processing, DSP), digital signal processing devices (DSP devices, DSPD), programmable logic devices (Programmable Logic Device, PLD), field programmable gate arrays (Field-Programmable Gate Array, FPGA), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described in embodiments of the invention. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

Optionally, as another embodiment, the processor 801 is further configured to: receiving first indication information sent by a base station through a special DCI signaling, wherein the first indication information comprises a broadcast multicast service identification number and identification information of the target transmission mode; or receiving second indication information sent by the base station through DCI of broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Optionally, as another embodiment, when the broadcast multicast service is at least two services configured based on a coverage area of a cell or a synchronization signal block SSB, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission manner of the broadcast multicast service.

Optionally, as another embodiment, when the broadcast multicast service is at least two services configured based on a coverage area of a cell or a synchronization signal block SSB, and the number of bits carried by the dedicated DCI signaling is smaller than the configured total broadcast multicast service number, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used for indicating a target transmission mode of the broadcast multicast service in the same transmission mode.

Optionally, as another embodiment, the manner in which the DCI of the broadcast multicast includes the second indication information includes: an indication field is newly added in the DCI of the broadcast multicast, and the indication field contains the second indication information; or redefining the meaning of the original field of the target in the DCI of the broadcast multicast as the second indication information.

Optionally, as another embodiment, the target original field includes any one of the following: DCI indication format, physical uplink control channel PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication.

Optionally, as another embodiment, when the target transmission mode is a PTM mode, the DCI for indicating the target transmission mode further includes carrier indication information.

Optionally, as another embodiment, the processor 801 is further configured to: and receiving third indication information periodically sent by the base station through the MCCH, wherein the third indication information comprises a target transmission mode of the broadcast multicast service, carrier wave or cell information for sending the broadcast multicast service and an index number of an SSB when the broadcast multicast service is sent by taking at least one SSB coverage area as a unit.

Optionally, as another embodiment, the processor 801 is further configured to: and receiving fourth indication information sent by the base station through the MAC-CE, wherein the fourth indication information comprises a control resource aggregate identification number and a transmission configuration indication TCI state identification number, and the TCI state identification number is associated with the SSB index number.

Optionally, as another embodiment, the processor 801 is further configured to: and when the terminal does not receive the DCI of the broadcast multicast in the timing duration of the preset timer, determining the target transmission mode of the broadcast multicast service as another transmission mode except the current transmission mode.

Optionally, as another embodiment, the processor 801 is further configured to: before acquiring a target transmission mode of a broadcast multicast service, receiving configuration information of the PTP mode and configuration information of the PTM mode, which are sent by a base station through a high-layer signaling; or after the target transmission mode of the broadcast multicast service is obtained, receiving configuration information of the target transmission mode sent by the base station;

the configuration information includes control channel detection time of a corresponding transmission mode and/or rate matching information of a physical downlink shared channel PDSCH.

Optionally, as another embodiment, the control channel detection opportunity is configured based on a single broadcast multicast service or based on a group of broadcast multicast services; and configuring the rate matching information of the PDSCH corresponding to the PTM mode based on a group of terminals.

Optionally, as another embodiment, the processor 801 is further configured to: when the target transmission mode is a PTP mode and the terminal is in an idle state, receiving Random Access Channel (RACH) resources configured by a base station and used for establishing PTP; or when the target transmission mode is a PTP mode and the terminal is in an idle state, the terminal generates a random number, and when the random number is larger than a preset access factor, a random access process is performed.

Alternatively, as another embodiment, the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas.

The terminal provided by the embodiment of the invention can realize each process realized by the terminal in the previous embodiment, and in order to avoid repetition, the description is omitted here.

Fig. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 9, the base station 900 may include at least one processor 901, a memory 902, at least one other user interface 903, and a transceiver 904. The various components in base station 900 are coupled together by bus system 905. It is appreciated that the bus system 905 is employed to enable connected communications between these components. The bus system 905 includes a power bus, a control bus, and a status signal bus in addition to the data bus. The various buses are labeled in fig. 9 as a bus system 905 for clarity of illustration, which may include any number of interconnected buses and bridges, and in particular one or more processors, as represented by processor 901, and various circuits of the memory, as represented by memory 902, linked together. The bus system may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., all as are well known in the art and, therefore, further description of embodiments of the present invention will not be provided. The bus interface provides an interface. The transceiver 904 may be a number of elements, i.e. comprising a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The user interface 903 may also be an interface capable of interfacing with an inscribed desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc., for different user devices.

It will be appreciated that the memory 902 in embodiments of the invention can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). The memory 902 of the systems and methods described in the various embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.

The processor 901 is responsible for managing the bus system and general processing, and the memory 902 may store computer programs or instructions for use by the processor 901 in performing operations, and in particular, the processor 901 may be configured to: transmitting a target transmission mode of a broadcast multicast service to a terminal, and transmitting configuration information of the target transmission mode to the terminal so that the terminal receives the broadcast multicast service based on the configuration information of the target transmission mode; wherein,

the target transmission mode is a point-to-point PTP mode or a point-to-multipoint PTM mode; the method for transmitting the target transmission mode of the broadcast multicast service to the terminal comprises any one of the following steps: the target transmission mode is sent to the terminal through downlink control information DCI, the target transmission mode is sent to the terminal through a multicast control channel MCCH, and the target transmission mode is sent to the terminal through a media access control-control unit MAC-CE.

The method disclosed in the above embodiment of the present invention may be applied to the processor 901 or implemented by the processor 901. Processor 901 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 901 or instructions in the form of software. The processor 901 may be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory 902, and the processor 901 reads information in the memory 902 and performs the steps of the above method in combination with its hardware.

Optionally, as another embodiment, the processor 901 is further configured to: transmitting first indication information through a special DCI signaling, wherein the first indication information comprises a broadcast multicast service identification number and identification information of the target transmission mode; or sending second indication information through DCI of broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from the current transmission mode to the target transmission mode.

Optionally, as another embodiment, the processor 901 is further configured to: and third indication information periodically transmitted through the MCCH, wherein the third indication information comprises a target transmission mode of the broadcast multicast service, carrier wave or cell information for transmitting the broadcast multicast service and an index number of an SSB when the broadcast multicast service is transmitted by taking at least one SSB coverage area as a unit.

Optionally, as another embodiment, the processor 901 is further configured to: and transmitting fourth indication information through the MAC-CE, wherein the fourth indication information comprises a control resource aggregate identification number and a transmission configuration indication TCI state identification number, and the TCI state identification number is associated with the SSB index number.

Optionally, as another embodiment, the processor 901 is further configured to: before a target transmission mode of a broadcast multicast service is sent to a terminal, configuration information of the PTP mode and configuration information of the PTM mode are sent to the terminal through a high-layer signaling; or after the target transmission mode of the broadcast multicast service is sent to the terminal, the configuration information of the target transmission mode is sent to the terminal;

Optionally, as another embodiment, the processor 901 is further configured to: and when the target transmission mode is a PTP mode and the terminal is in an idle state, configuring a Random Access Channel (RACH) resource used by the terminal for establishing the PTP.

The base station provided by the embodiment of the present invention can implement each process implemented by the base station in the foregoing embodiment, and in order to avoid repetition, details are not repeated here.

The scheme provided by the embodiment of the invention is mainly described from the perspective of the electronic equipment. It may be understood that, in order to implement the above-mentioned functions, the electronic device provided in the embodiment of the present invention includes corresponding hardware structures and/or software modules for executing each function. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software.

Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The embodiment of the invention can divide the functional modules of the electronic equipment and the like according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules.

It should be noted that, in the embodiment of the present invention, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. The specific working processes of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or units.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented in the form of software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. With such understanding, all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in the embodiments of the invention. The computer storage medium is a non-transitory (english) medium comprising: flash memory, removable hard disk, read-only memory, random access memory, magnetic or optical disk, and the like.

In another aspect, embodiments of the present invention also provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the methods provided by the above-described method embodiments.

On the other hand, the embodiment of the present invention further provides a non-transitory computer readable storage medium, on which a computer program is stored, where the computer program when executed by a processor implements the method steps provided in the foregoing embodiments and can achieve the same technical effects, and no further description is given here.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for switching broadcast multicast transmission modes, applied to a terminal, comprising the steps of:

The acquisition mode of the target transmission mode comprises any one of the following: acquiring the target transmission mode indicated by a base station in downlink control information DCI, acquiring the target transmission mode indicated by the base station in a multicast control channel MCCH, acquiring the target transmission mode indicated by the base station through a media access control-control unit MAC-CE, and acquiring the target transmission mode through a preset timer;

the obtaining the target transmission mode indicated by the base station in the downlink control information DCI includes:

receiving second indication information sent by a base station through DCI of broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from a current transmission mode to the target transmission mode;

the obtaining the target transmission mode indicated by the base station in the multicast control channel MCCH includes:

receiving third indication information periodically sent by a base station through an MCCH, wherein the third indication information comprises a target transmission mode of the broadcast multicast service, carrier wave or cell information for sending the broadcast multicast service and an index number of an SSB (synchronous signal block) when the broadcast multicast service is sent by taking at least one SSB coverage area as a unit;

The acquiring the target transmission mode indicated by the base station through the media access control-control unit (MAC-CE) comprises the following steps:

receiving fourth indication information sent by a base station through an MAC-CE, wherein the fourth indication information comprises a control resource aggregate identification number and a transmission configuration indication TCI state identification number, and the TCI state identification number is associated with an SSB index number;

the obtaining the target transmission mode through a preset timer includes:

2. The method for switching a broadcast multicast transmission mode according to claim 1, wherein when the broadcast multicast service is at least two services configured based on a coverage area of a cell or a synchronization signal block SSB, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service.

3. The method for switching a broadcast multicast transmission mode according to claim 1, wherein when the broadcast multicast service is at least two services configured based on a cell or a synchronization signal block SSB coverage area and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used for indicating a target transmission mode of a broadcast multicast service in the same transmission mode.

4. The method for switching a broadcast multicast transmission mode according to claim 1, wherein the mode in which the DCI of the broadcast multicast contains the second indication information includes:

5. The method for switching a broadcast multicast transmission mode according to claim 4, wherein the original target field includes any one of the following:

DCI indication format, physical uplink control channel PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication, time domain resource allocation indication.

6. The method for switching a broadcast multicast transmission scheme according to claim 1, wherein when the target transmission scheme is a PTM scheme, DCI for indicating the target transmission scheme further includes carrier indication information.

7. The method for switching a broadcast multicast transmission mode according to claim 1, wherein the obtaining the configuration information of the target transmission mode includes:

Before acquiring a target transmission mode of a broadcast multicast service, receiving configuration information of the PTP mode and configuration information of the PTM mode, which are sent by a base station through a high-layer signaling; or alternatively, the process may be performed,

after the target transmission mode of the broadcast multicast service is acquired, receiving configuration information of the target transmission mode sent by the base station;

8. The method for switching between broadcast multicast transmission modes as recited in claim 7, wherein,

the control channel detection opportunity is configured based on a single broadcast multicast service or a group of broadcast multicast services;

and configuring the rate matching information of the PDSCH corresponding to the PTM mode based on a group of terminals.

9. The method for switching a broadcast multicast transmission mode according to claim 1, further comprising:

when the target transmission mode is a PTP mode and the terminal is in an idle state, receiving Random Access Channel (RACH) resources configured by a base station and used for establishing PTP; or alternatively, the process may be performed,

when the target transmission mode is a PTP mode and the terminal is in an idle state, the terminal generates a random number, and when the random number is larger than a preset access factor, a random access process is performed.

10. The method according to any one of claims 1 to 9, wherein the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas.

11. A method for switching broadcast multicast transmission modes, applied to a base station, comprising the following steps:

the method for transmitting the target transmission mode of the broadcast multicast service to the terminal comprises any one of the following steps: the target transmission mode is sent to a terminal through downlink control information DCI, the target transmission mode is sent to the terminal through a multicast control channel MCCH, and the target transmission mode is sent to the terminal through a media access control-control unit MAC-CE;

the sending the target transmission mode to the terminal through downlink control information DCI includes:

transmitting second indication information through DCI of broadcast multicast, wherein the second indication information is used for indicating that the transmission mode of the broadcast multicast service is switched from a current transmission mode to the target transmission mode;

the sending the target transmission mode to the terminal through the multicast control channel MCCH comprises the following steps:

third indication information periodically transmitted through the MCCH, wherein the third indication information comprises a target transmission mode of the broadcast multicast service, carrier wave or cell information for transmitting the broadcast multicast service and an index number of an SSB (service broadcast multicast service) when at least one SSB coverage area is used as a unit for transmitting the broadcast multicast service;

the sending, by the MAC-CE, the target transmission mode to the terminal includes:

and transmitting fourth indication information through the MAC-CE, wherein the fourth indication information comprises a control resource aggregate identification number and a transmission configuration indication TCI state identification number, and the TCI state identification number is associated with the SSB index number.

12. The method for switching a broadcast multicast transmission mode according to claim 11, wherein when the broadcast multicast service is at least two services configured based on a coverage area of a cell or a synchronization signal block SSB, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission mode of a broadcast multicast service.

13. The method for switching a broadcast multicast transmission mode according to claim 11, wherein when the broadcast multicast service is at least two services configured based on a cell or a synchronization signal block SSB coverage area and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used for indicating a target transmission mode of the broadcast multicast service in the same transmission mode.

14. The method for switching a broadcast multicast transmission mode according to claim 11, wherein the mode in which the DCI of the broadcast multicast contains the second indication information includes:

15. The method for switching a broadcast multicast transmission mode according to claim 14, wherein the original target field includes any one of the following:

16. The method for switching a broadcast multicast transmission scheme according to claim 11, wherein when the target transmission scheme is a PTM scheme, DCI for indicating the target transmission scheme further includes carrier indication information.

17. The method for switching a broadcast multicast transmission mode according to claim 11, wherein the sending the configuration information of the target transmission mode to the terminal includes:

before a target transmission mode of a broadcast multicast service is sent to a terminal, configuration information of the PTP mode and configuration information of the PTM mode are sent to the terminal through a high-layer signaling; or alternatively, the process may be performed,

after a target transmission mode of a broadcast multicast service is sent to a terminal, configuration information of the target transmission mode is sent to the terminal;

18. The method for switching between broadcast multicast transmission modes as recited in claim 17, wherein,

19. The method for switching a broadcast multicast transmission mode according to claim 11, further comprising:

and when the target transmission mode is a PTP mode and the terminal is in an idle state, configuring a Random Access Channel (RACH) resource used by the terminal for establishing the PTP.

20. The method according to any one of claims 11 to 19, wherein the target transmission mode of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas.

21. A switching device of a broadcast multicast transmission mode, applied to a terminal, comprising:

the obtaining the target transmission mode through a preset timer includes:

22. A switching device of broadcast multicast transmission mode, applied to a base station, comprising:

23. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the following steps when executing the computer program:

the obtaining the target transmission mode through a preset timer includes:

24. The terminal of claim 23, wherein when the broadcast multicast service is at least two services configured based on a cell or synchronization signal block SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission manner of the broadcast multicast service.

25. The terminal of claim 23, wherein when the broadcast multicast service is at least two services configured based on a cell or synchronization signal block SSB coverage area and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate a target transmission mode of a broadcast multicast service of the same transmission mode.

26. The terminal of claim 23, wherein the manner in which the broadcast-multicast DCI contains the second indication information comprises:

27. A base station comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the following steps when executing the computer program:

28. The base station of claim 27, wherein when the broadcast multicast service is at least two services configured based on a cell or synchronization signal block SSB coverage area, the first indication information is bitmap indication information, and each bit in the bitmap indication information corresponds to a target transmission manner of the broadcast multicast service.

29. The base station of claim 27, wherein when the broadcast multicast service is at least two services configured based on a cell or synchronization signal block SSB coverage area and the number of bits carried by the dedicated DCI signaling is less than the total number of configured broadcast multicast services, the first indication information includes at least two sets of bitmap indication information, and each set of bitmap indication information is used to indicate a target transmission mode of a broadcast multicast service of the same transmission mode.

30. The base station of claim 27, wherein the manner in which the broadcast-multicast DCI contains the second indication information comprises:

31. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of switching a broadcast multicast transmission mode according to any one of claims 1 to 10 or performs the steps of the method of switching a broadcast multicast transmission mode according to any one of claims 11 to 20.