CN113950002A

CN113950002A - Switching method of broadcast multicast transmission mode, terminal and base station

Info

Publication number: CN113950002A
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: 2022-01-18
Anticipated expiration: 2040-07-15
Also published as: WO2022012170A1; CN116095615A; CN113950002B

Abstract

The embodiment of the invention provides a switching method of a broadcast multicast transmission mode, a terminal and a base station, 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 modes: acquiring the target transmission mode indicated by the base station in the DCI, acquiring the target transmission mode indicated by the base station in the multicast control channel MCCH, acquiring the target transmission mode indicated by the base station through the MAC-CE, and acquiring the target transmission mode through a preset timer. The embodiment of the invention can quickly indicate the transmission mode of the broadcast multicast service.

Description

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

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 broadcast multicast transmission modes.

Background

With The increasing popularity of mobile video services, peer-to-peer multicast/broadcast streaming, group communication, and Internet of Things (IoT) applications, The global mobile communication industry has reached consensus, and a fifth generation mobile communication (5G) network needs to have The capability of flexibly and dynamically allocating wireless spectrum and network resources between unicast services and multicast services, and needs to support independent deployment of a broadcast/multicast network.

In the current 5G, a base station sends two data types, one is terminal-oriented data, which can only be received by a target terminal, and the data becomes unicast data; the other is data for all terminals or specific groups in the cell, that is, all users or specific groups in the cell can receive the service.

In the technical evolution of New Radio (NR), in order to perform broadcast multicast transmission more efficiently, two transmission modes, namely, a point-to-point (PTP) transmission mode and a point-to-multipoint (PTM) transmission mode, are supported. The PTP method refers to that a transmitting node (base station) transmits data 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 the number of users receiving the broadcast multicast service is small (namely, when the number of terminals needing to receive the service in the PTP mode is small). The PTM scheme means that the sending node transmits data based on a plurality of terminals, that is, the scheduling signaling and corresponding scheduling data are performed for a group of terminals; the method has the characteristics that data transmission needs to be carried out at 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 waste of air interface resources is a problem that needs to be researched at present.

Disclosure of Invention

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

The embodiment of the invention provides a method for switching 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 modes: acquiring the target transmission mode indicated by the 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 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:

sending a target transmission mode of a broadcast multicast service to a terminal, and sending 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 sending the target transmission mode of the broadcast multicast service to the terminal comprises any one of the following steps: and sending the target transmission mode to a terminal through Downlink Control Information (DCI), sending the target transmission mode to the terminal through a Multicast Control Channel (MCCH), and sending the target transmission mode 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:

a sending module, 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,

The embodiment of the invention provides a terminal, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the steps of the switching method of the broadcast multicast transmission mode applied to the terminal.

The embodiment of the invention provides a base station, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the steps of the switching method of the broadcast multicast transmission mode applied to the base station.

An embodiment of the present invention 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 steps of the method for switching a broadcast multicast transmission mode.

According to the switching method of the broadcast multicast transmission mode, the terminal and the base station provided by the embodiment of the invention, the target transmission mode of the broadcast multicast service is acquired by adopting a DCI (Downlink control information), an MCCH (multipoint control channel), an MAC-CE (media access control-chip) or a preset timer mode, namely, the switching of a PTM (packet transport protocol)/PTP (precision time protocol) mode is carried out, so that the switching of the transmission mode of the broadcast multicast service is more flexible, the change of the transmission mode is effectively and quickly indicated, 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 in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a flowchart illustrating steps of a method for switching transmission modes of a broadcast multicast service applied to a terminal according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a target transmission manner of multiple broadcast multicast services indicated by a bitmap according to an embodiment of the present invention;

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

fig. 4 is a second schematic diagram illustrating a target transmission method of a plurality of broadcast multicast services according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating steps of a method for switching transmission modes of a broadcast multicast service applied to a base station according to an embodiment of the present invention;

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

fig. 7 is a block diagram of a switching apparatus for transmission of broadcast multicast service applied to a base station according to an embodiment of the present invention;

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

fig. 9 is a schematic structural diagram of a base station in an embodiment of the present invention.

Detailed Description

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

For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in each embodiment of the present invention, if words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and actions, those skilled in the art can understand that the words such as "first" and "second" do not limit the quantity and execution order.

The term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "three types" generally indicates that the former and latter associated objects are in an "or" relationship.

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

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, an area covered by a cell of a base station is divided into a plurality of areas, each area is divided into a System Synchronization Block (SSB) coverage area, when a System broadcast message is sent, each area sends a System broadcast message with the same content once, in order to ensure the continuity of coverage, there are continuous and certain overlapping areas between the SSB coverage areas, for example, one cell is covered by 4 SSBs. Specifically, for the system broadcast message sent in each SSB coverage area, data transmission between the SSB coverage areas is time-division, that is, data transmission is performed at different time. For example, assuming that a cell includes 4 SSB coverage areas, there are 2 candidate times for each SSB to transmit a scheduling system broadcast message, and a broadcast information monitoring time window includes 8 monitoring occasions, there are 2 monitoring occasions for each SSB coverage area, and at this time, in order to make scheduling flexibility of a base station, when broadcast information corresponding to each SSB coverage area is transmitted, it is only necessary to transmit scheduling information of the broadcast information to a terminal at one of the monitoring occasions. The scheduling information transmitted at the monitoring time is used to instruct the base station to transmit Physical Downlink Shared Channel (PDSCH) scheduling information corresponding to the broadcast information in the SSB coverage area, and includes time domain and frequency domain positions of the PDSCH, modulation and coding format, redundancy version, and the like.

The broadcast multicast service is an important multimedia service which needs to be supported by 5G, and comprises streaming media, such as audio broadcast, television live broadcast and the like, from the aspect of service types; from a data type perspective, including data files as used for software upgrades; from the public safety category, information such as earthquake, tsunami, or public health safety is included. Different services correspond to different time delay requirements and data rates have different sizes, so compared with system broadcast information, the system broadcast information has the characteristics of different service quality requirements, different rates and the like, and particularly, the television live broadcast service needs higher service rate and transmission quality requirements. In addition, in the transmission mode, the transmission of the broadcast multicast ancestry comprises two modes of PTP and PTM, wherein the PTM mode means that a base station establishes a radio bearer, single-point transmission is carried out, a plurality of terminals receive at the same time, and the mode is suitable for a plurality of terminals (for example, more than 10 terminals) to receive the broadcast multicast service data; the PTP mode is a mode in which a base station establishes a radio bearer for each terminal, and the PTP 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 transmitted needs to be clarified so that a receiving end can receive the data. For example, when the base station transmits a Physical Downlink Control Channel (PDCCH) when the terminal is in the coverage area of the SSB1, the transmission beam and the SSB1 are consistent (i.e., the PDCCH and the SSB1 have a Quasi-Co-Location (QCL) relationship, i.e., the channel characteristics on the antenna port symbol of the transmission PDCCH can be derived from the antenna port of the transmission SSB 1). When the terminal moves from the coverage of the SSB1 to the coverage of the SSB2, the base station transmits the PDCCH, and its transmission beam needs to be adjusted in the direction of the SSB2 (i.e., the PDCCH and the SSB2 have a QCL relationship). Such QCL relationship between the PDCCH and a certain SSB adopts a Transmission Configuration Indication (TCI) state, and when the terminal moves from the SSB1 to the SSB2, the base station transmits TCI state Indication information through a media access control-control element (MAC-CE) message.

In addition, when the PTP and PTM transmission modes are switched, the conventional procedures of PTP to PTM switching indication and PTM establishment are as follows: 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 the PTM configuration information on the MCCH; and then the sending node receives the multicast broadcast service data according to the PTM configuration information. The conventional procedures for the PTM to PTP handover indication and PTP establishment are: a sending 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 state is an idle state, performing a random process to enter a link state, establishing PTP connection and establishing data transmission.

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

However, the MCCH is only used to indicate the PTP/PTM handover, and has the following disadvantages: first, the switching instruction is delayed, and the request for switching the transmission scheme cannot be responded to quickly. The switching of PTP/PTM mainly applies the scenario to make the resource utilization the best. On one hand, when the number of service users receiving the broadcast multicast and the channel change, the switching is needed, and when the communication load of the base station changes, the switching may also be needed. The response time of the MCCH depends on the content modification period configured for the MCCH, the configuration period is a hundred milliseconds or 1 to 2 seconds, and the time delay is relatively large (it should be noted that configuring a shorter MCCH content modification period requires the terminal to continuously receive MCCH data, which wastes air interface resources and is not beneficial to saving power for the terminal). Second, the handover indication in units of cells will cause waste of empty ports. For example, when there are a plurality of terminals satisfying PTM in the coverage area of SSB1, PTM is used in all the SSBs of the cell, which results in waste of resources. To this end, the invention provides the following examples:

as shown in fig. 1, a flowchart of a method for switching transmission modes of broadcast multicast in an embodiment of the present invention is shown, where the method 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 a PTP mode or a 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 a target transmission mode through a preset timer.

Namely, the target transmission mode of the broadcast multicast service can be indicated through DCI, MAC-CE, MCCH of a control channel or through a preset timer, so that the delay of the indication of the transmission mode switching is avoided, and the requirement for the transmission mode switching of the broadcast multicast service can be quickly responded.

In addition, specifically, the configuration information of the target transmission method may include any one of the following items: control channel detection timing, PDSCH rate matching information, and partial bandwidth part (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 scheme is obtained, the broadcast multicast service may be received directly based on the configuration information of the target transmission scheme.

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

In this way, the present embodiment determines the target transmission mode of the broadcast multicast service by using DCI, MCCH, MAC-CE or a preset timer, that is, performs the switching of the PTM/PTP mode, 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 acquisition method of the target transmission method is explained below.

First, a scheme of instructing a target transmission scheme by DCI:

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

(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.

It should be noted that the dedicated DCI refers to a DCI format for indicating a broadcast multicast service transmission method, and a special Radio Network Temporary Identifier (RNTI) is configured to distinguish existing other DCI formats, such as a defined mode switching-radio network temporary identifier (ms-RNTI). At this time, the sending end uses the ms-RNTI to carry out scrambling processing on DCI transmitted on the PDCCH, the receiving end uses the ms-RNTI to carry out PDCCH detection and descrambling, and the terminal can obtain the indication information of the target transmission mode to carry out PTP/PTM conversion.

In addition, the special 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, and for example, a 0-identification PTM mode and a 1-identification PTP mode may be used, or a 1-identification PTM mode and a 0-identification PTP mode may be used, which is not specifically limited herein.

In addition, specifically, when the broadcast multicast service is at least two services configured based on a cell or an 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, the broadcast multicast service may be identified by a Temporary Mobile Group Identity (TMGI), and the configuration order may be: TMGI-1, TMGI-2, TMGI-3 … TMGI-N, 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 sequence corresponds to the configured broadcast multicast service, as shown in fig. 2 specifically. In fig. 2, the target transmission modes of the broadcast multicast service identified as TMGI-1 to TMGI-12 are indicated by a bitmap indication mode, where 0 indicates the PTM mode and 1 indicates the PTM mode.

In addition, specifically, when the broadcast multicast service is at least two services configured based on a cell or an SSB coverage area, and the bit number carried by the dedicated DCI signaling is smaller than the total configured number of 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 with the same transmission mode.

For example, if M broadcast multicast services that need to be indicated by the DCI signaling are configured in total, the maximum bit number carried by the DCI signaling is N, and M > N, the grouping method adopted in this case may be:

dividing M into L groups, each group in L-1 group contains K services

The L-th group contains (M-K (L-1)) services, wherein

Indicating rounding up. In addition, in the N-bit bitmap,

the packet number is shown, and K represents the transmission mode corresponding to K services.

In addition, after the base station configures M and N values, the method for the terminal and the base station to determine L and K values includes: satisfy the requirement of

In the case where the equation holds, L takes the minimum value in the array {1,2,3 … N-1 }. Examples are as follows:

for example, when N is 16 and M is 16, L is 1 and the number of packets is 1, indicating that the method is a special case where no packets are performed.

For another example, as shown in fig. 3, when N is 16 and M is 25, L is 2, the number of packets is 2, of the 16 bits of the dedicated DCI, 1 bit represents a group number, and the remaining 15 bits indicate a transmission scheme of the corresponding broadcast multicast service in a bitmap manner; that is, in the set of bitmap indication information in fig. 3, the transmission method of a set of broadcast multicast services with a set number of 0 is indicated.

For another example, as shown in fig. 4, when N is 16 and M is 40, L is 3, the number of packets is 3, 2 bits of the 16 bits of the dedicated DCI indicate a group number, and the remaining 14 bits indicate a transmission scheme of the corresponding broadcast multicast service in a bitmap manner; that is, in the set of bitmap indication information in fig. 4, the transmission method of a set of broadcast multicast services with a set number 2 (corresponding to 01) is indicated.

Therefore, the target transmission mode of the broadcast multicast service is indicated in a bitmap mode, and the overhead 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 DCI for broadcast multicast indicates the second indication information, the second indication information is indicated in the DCI for unicast scheduling when the current transmission mode of the broadcast multicast service is the PTP mode, and the second indication information is indicated in the DCI for multicast scheduling when the current transmission mode of the broadcast multicast service is the PTM.

Specifically, the method for including the second indication information in the DCI of the broadcast multicast may include:

an indication field is newly added in the DCI of the broadcast multicast, and the indication field contains second indication information; or, redefining the meaning of the target original field in the DCI of the broadcast multicast into second indication information.

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

In addition, specifically, the target native field includes any one of the following items: DCI indication format, PUCCH power control parameter, HARQ process number, frequency domain resource allocation indication (for example, using combination which is not used in frequency domain resource indication, such as all '1'), time domain resource allocation indication. The original meaning of any one of the original target fields is modified, and the original meaning of the original target field is redefined into second indication information, so that the channel detection is favorably carried out by a terminal, and the requirement on the channel detection capability is reduced.

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

In addition, it should be noted herein that, when the target transmission scheme is the PTM scheme, the DCI for indicating the target transmission scheme further includes carrier indication information and/or BWP information. Therefore, when the carrier transmitted by the PDSCH and the PDCCH for transmitting the broadcast multicast service is on different carriers or BWPs, the terminal can receive the corresponding PDSCH according to the carrier indication information in the DCI.

Secondly, aiming at the method of indicating the target transmission mode through the MCCH:

when acquiring the target transmission mode indicated by the base station in the MCCH, the terminal may receive third indication information periodically transmitted 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 in units of at least one SSB coverage area.

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

TMG1 is 1, which indicates that the broadcast multicast service identification number is 1;

cell ID 3, which indicates Cell ID number 3;

the SSB index is 0, the mode is PTP, and when the index number of the SSB coverage area is 0, the target transmission mode is PTP;

the SSB index is 1, the mode is PTM, when the index number of the SSB coverage area is 1, the target transmission mode is a PTM mode;

the SSB index is 2, the mode is PTM, when the index number of the SSB coverage area is 2, the target transmission mode is PTM mode;

and the SSB index is 3, the mode is PTP, and when the index number of the SSB coverage area is 3, the target transmission scheme is the PTP scheme.

The above example defines that the broadcast multicast service identification number is 1, and is transmitted in the cell 3, where the SSB0 of the cell 3 is transmitted in the PTP transmission mode, the SSB1 of the cell 3 is transmitted in the PTM transmission mode, the SSB2 of the cell 3 is transmitted in the PTM transmission mode, and the SSB3 of the cell 3 is transmitted in the PTP transmission mode.

Therefore, the target transmission mode is periodically indicated through the MCCH mode, so that a terminal newly accessed to receive the broadcast multicast service can acquire the transmission mode of the specific broadcast multicast service.

Thirdly, aiming at the method of indicating the target transmission mode through the MAC-CE:

and the terminal can receive the fourth indication information sent by the base station through the MAC-CE when acquiring the target transmission mode indicated by the base station through the MAC-CE.

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

Specifically, for the method of indicating the target transmission mode 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 target 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 shown in the following table:

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

Fourthly, aiming at the mode of indicating the target transmission mode through a preset timer:

when the terminal acquires 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, that is, perform switching of the transmission modes, when the terminal does not receive the DCI of the broadcast multicast within the timing duration of the preset timer.

Specifically, when the service transmission of the broadcast multicast is in a certain mode, the terminal detects a corresponding control channel on a detection opportunity of the corresponding mode, and when the terminal does not receive any control information of the broadcast multicast (possibly, the base station sends a notification, but the terminal does not detect) within a certain time period, the terminal determines that the transmission mode of the broadcast multicast is changed, and then the terminal switches to a detection opportunity of another transmission mode to detect the corresponding control channel.

The preset timer is used for indicating the target transmission mode, so that the transmission mode can be switched under the condition that the terminal cannot receive the information.

Thus, the above-mentioned embodiment implements indication of a target transmission mode of a broadcast multicast service by means of DCI, MCCH, MAC-CE or a preset timer, i.e. implements indication of switching of a transmission mode of a broadcast multicast service, which is equivalent to the prior art, so that switching of a transmission mode is more flexible, and air interface resources are effectively saved.

It should be further noted that, when the terminal is in the connected state, the terminal determines the timing of the SSB handover performed by the terminal through measuring the neighboring SSBs and reporting the measurement result to the base station, so as to ensure that the PTP/PTM handover is effectively performed in a specific SSB coverage area. When the terminal is in idle state, the terminal can only receive the broadcast multicast service sent by PTM mode, when the SSB coverage area is changed due to movement, the selection of the SSB coverage area is automatically carried out according to the result of the mobility measurement.

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, which are sent by the base station through a high-level signaling, may be received; or after acquiring the target transmission mode of the broadcast multicast service, receiving the configuration information of the target transmission mode sent by the base station.

That is, the base station may send the configuration information of the PTM and PTP to the terminal in advance through the high-level signaling, and directly apply the configuration information of the PTM or PTP after the terminal acquires the target transmission mode of the broadcast multicast service, without acquiring from the base station again, thereby further reducing the time delay of the transmission mode conversion. Of course, the base station may also receive the configuration information of the target transmission scheme sent by the base station after acquiring the target transmission scheme of the broadcast multicast service, so as to avoid receiving the configuration information of the invalid transmission scheme.

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

In addition, it should be noted herein that the control channel detection opportunity is configured based on a single broadcast multicast service or configured based on a group of broadcast multicast services; the rate matching information of the PDSCH corresponding to the PTM mode 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 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 may generate a random number, and perform a random access process when the random number is greater than a preset access factor.

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

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

In addition, in this embodiment, the target transmission method of the broadcast multicast service is configured in units of a single SSB coverage area or a group of SSB coverage areas. This makes the indication granularity of the transmission mode be SSB coverage area level, which is finer than cell level, further saving air interface resources.

In the method for switching transmission modes of a broadcast multicast service provided in this embodiment, a target transmission mode of the broadcast multicast service is determined by using DCI, MCCH, MAC-CE or a preset timer, that is, a PTM/PTP mode is switched, so that the transmission modes of the broadcast multicast service are switched more flexibly, and air interface resources are effectively saved.

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

step 501: and 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.

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 method for transmitting the target transmission mode of the broadcast multicast service to the terminal includes any one of the following: and sending the target transmission mode to the terminal through the DCI, sending the target transmission mode to the terminal through the MCCH and sending the target transmission mode to the terminal through the MAC-CE.

Namely, 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 the transmission mode switching indication and quickly responding to the requirement of the transmission mode switching of the broadcast multicast service.

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

In this way, the present embodiment performs the indication of the target transmission mode of the broadcast multicast service, i.e., performs the switching of the PTM/PTP mode, by using DCI, MCCH, or MAC-CE, 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 method of the target transmission method will be described below.

First, a scheme of instructing a target transmission scheme 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:

(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 an 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.

In addition, specifically, when the broadcast multicast service is at least two services configured based on a cell or an SSB coverage area, and the bit number 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 with the same transmission mode.

(2) And sending second indication information 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, the manner in which the DCI of the broadcast multicast includes the second indication information may include: an indication field is newly added in the DCI of the broadcast multicast, and the indication field contains second indication information; or, redefining the meaning of the target original field in the DCI of the broadcast multicast into second indication information.

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

In addition, it should be noted herein that, when the target transmission scheme is the PTM scheme, the DCI for indicating the target transmission scheme further includes carrier indication information.

and when the target transmission mode is sent to the terminal through the MCCH, the third indication information can 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 sending the broadcast multicast service, and an index number of the SSB when the broadcast multicast service is sent in units of at least one SSB coverage area.

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

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

Thus, the above-mentioned embodiment implements indication of a target transmission mode of a broadcast multicast service through a DCI, MCCH, or MAC-CE mode, that is, implements indication of switching of a transmission mode of a broadcast multicast service, which is equivalent to the prior art, so that switching of a transmission mode is more flexible, and air interface resources are effectively saved.

It should be noted that, for specific contents of any of the above manners, reference may be made to related contents of the terminal-side method embodiment, and details are not described herein again.

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-level signaling; or after the target transmission mode of the broadcast multicast service is sent to the terminal, sending the configuration information of the target transmission mode to the terminal; the configuration information includes a control channel detection opportunity corresponding to the transmission mode and/or rate matching information of the 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 a random access channel RACH resource used by the terminal to establish PTP.

It should be noted that specific contents of the foregoing embodiments may refer to related contents of the method embodiments at the terminal side, and are not described herein again.

In the method for switching transmission modes of a broadcast multicast service provided in this embodiment, a DCI, MCCH, or MAC-CE mode is used to indicate a target transmission mode of the broadcast multicast service, so that the switching of the transmission modes of the broadcast multicast service is more flexible, and air interface resources are effectively saved.

The present invention will be specifically described below with reference to specific examples.

The first embodiment:

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

step 1, the base station indicates the target transmission mode of the broadcast multicast service through the 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 distinguished from other existing DCI formats by configuring a special Radio Network Temporary Identifier (RNTI), such as a radio network temporary identifier (ms-RNTI) for mode switching, at this time, a transmitting end (which may be a base station) performs scrambling processing on DCI transmitted on a PDCCH channel using the ms-RNTI, and a receiving end (which may be a terminal) performs PDCCH detection and descrambling using the ms-RNTI, so as to obtain PTP/PTM switching 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;

an identification field of the destination transmission mode, where the field is used to identify the destination transmission mode, for example, "0" may be used to identify the PTM mode, "1" may be used to identify the PTP mode, or "1" may be used to identify the PTM mode, "0" may be used to identify the PTP mode, which is not limited specifically 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 the specific indication mode is as follows:

when the broadcast multicast service is at least two services in the local cell or 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 Identity (TMGI), and the configuration sequence may be: TMGI-1, TMGI-2, TMGI-3 … TMGI-N, 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 sequence corresponds to the configured broadcast multicast service, as shown in fig. 2 specifically. In fig. 2, 0 indicates a PTM scheme, and 1 indicates a PTM scheme.

In addition, when the bit number carried by the dedicated DCI signaling is less than the configured total number of broadcast multicast services, a grouping indication mode 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 mode of the broadcast multicast service of the same transmission mode. For example, if M broadcast multicast services that need to be indicated by the DCI signaling are configured in total, the maximum bit number carried by the DCI signaling is N, and M > N, the grouping method adopted in this case may be:

dividing M into L groups, each group in L-1 group contains K services

The lth group contains (M-K (L-1)) services. In addition, in the N-bit bitmap,

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

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

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

The control channel detection timing refers to which time (time slot or symbol) the control channel is detected when the terminal receives the broadcast multicast service. The base station configures 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 may be configured through RRC signaling or broadcast signaling or multicast signaling.

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

Furthermore, the step 2 may be performed after the step 1, that is, the base station transmits the configuration information of the target transmission scheme according to the target transmission scheme of the broadcast multicast service. Of course, this step may be performed before step 1, that is, the base station configures both the configuration information of the PTP system and the configuration information of the PTM system to the terminal, and the terminal selects the configuration information of the target transmission system according to the target transmission system.

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

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

In addition, the terminal adopts different receiving processes for different transmission modes, and the specific receiving process mode is as follows:

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

Specifically, in order to increase the scheduling flexibility of the base station, when the target transmission mode is the PTM mode, the DCI of the group scheduling information includes carrier indication information (that is, carriers transmitted 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 indicating of the target transmission mode of the broadcast multicast service through the DCI signaling of the broadcast multicast scheduling specifically includes the following steps:

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

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

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 all information field bits) of the relevant DCI increases). For example, adding 1 bit to DCI indicates that a PTP or PTM mode handover is to be performed. The method is simple in implementation process.

And secondly, redefining the meaning of the target original field in the DCI of the broadcast multicast into 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 content meaning of the original DCI is modified, and the total SIZE of the DCI is not changed. The method is beneficial to the terminal to carry out channel detection and reduces the requirement on the channel detection capability.

Specifically, the target legacy 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 as 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 all the frequency domain resource allocation indications are 1, and the switching of the transmission mode of the broadcast multicast service may be indicated when all the time domain resource allocation indications are 0, which is not specifically limited herein.

In addition, in order to increase the scheduling flexibility of the base station, when the target transmission mode is the PTM mode, the DCI of the group scheduling information includes carrier indication information (that is, the carriers transmitted 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 be indicated in two ways, one is a new information field, and the other is to redefine the meaning of the original field in the DCI.

The indication information of the indicating carrier wave of the original field of the redefined DCI is described as follows:

in the above expression, a DCI format indicator (DCI format) with a length of 1 bit is used to indicate whether uplink or downlink scheduling is performed when the DCI is a non-broadcast multicast (the non-broadcast multicast DCI refers to an existing scheduling signaling format DCI, such as unicast data scheduled with C-RNTI, CS-RNTI, and MCS-RNTI as scrambling codes). When the DCI is broadcast multicast (where the broadcast multicast DCI is broadcast or multicast data scheduled for a channel scrambling code using "different from existing unicast RNTI", such as G-RNTI), only downlink scheduling is available, so that the bit information can be used to indicate carrier indication information.

In addition, in the above table, the 2-bit PUCCH power control parameter is used to indicate an uplink power parameter when the DCI is non-broadcast multicast. When the DCI is broadcast multicast, because of group scheduling, 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, and may be used to indicate carrier indication information in this case.

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

This step is the same as step 2 of the first embodiment, and is not described again here.

In addition, it should be noted that, when the transmission mode of the broadcast multicast is switched from the PTM to the PTP, if there are a large number of idle terminals that need to establish a connection, that is, there are a large number of terminals performing a random access process, which may cause instantaneous network congestion, at this time, the present embodiment may solve the problem in the following manner:

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, the RACH resources configured by the base station for establishing the PTP may be received. Specifically, some extra RACH access resources are configured through broadcast or multicast messages, and when the network instructs to switch to PTP, the network instructs the RACH resources to take effect at the same time, and a terminal that needs to establish connection for receiving broadcast multicast service, and some or all terminals initiate random access on the extra PRACH resources. In order to reduce the resource waste, the base station indicates an additional RACH resource valid period, i.e., during the valid period, the terminal may initiate random access using the additionally configured RACH resource. The extra RACH resource may be a RACH resource configured separately, or a RACH resource that is configured by the base station in the original state but is masked by the MASK.

And secondly, 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, and performing a random access process when the random number is greater than the preset access factor, or else, waiting for a certain time and then starting random access.

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

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

When the DCI analysis result indicates that PTP occurs, the terminal starts detecting the control channel at the detection time configured for the PTP mode and stops detecting the control channel at the detection time configured for the PTM mode.

Example three:

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

Specifically, indicating the target transmission mode of the broadcast multicast service 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 fails to detect the target transmission mode of the broadcast multicast service for some reason (for example, the channel quality is poor, the related information cannot be correctly detected, or the terminal receives a service with higher priority due to a problem of priority), the terminal indicates the target transmission mode based on a 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, and when no control information of the broadcast multicast is received within the timing duration of the preset timer, it is considered that the transmission mode of the broadcast multicast is changed (possibly, 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 time, the base station indicates a specific broadcast multicast service to be sent in a PTM manner, the terminal detects a broadcast multicast control channel at a detection time corresponding to the PTM manner, starts a preset timer (for example, the time length of the timer is 1 second), and executes the following processes:

before the preset timer is overtime, if the control information of the broadcast multicast is received, the timing is restarted, and the terminal continues to detect the control channel of the broadcast multicast on the detection opportunity of the PTM;

if the preset timer is overtime (that is, no control information of the broadcast multicast is received within 1 s), determining that the target transmission mode of the broadcast multicast service is a PTP mode, and receiving the broadcast multicast service by the terminal in the PTP mode.

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

As shown in fig. 6, a block diagram of a switching apparatus of a broadcast multicast transmission scheme applied to a terminal in an embodiment of the present invention is shown, where the apparatus 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,

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 cell or a 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 mode of the broadcast multicast service.

Optionally, 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 to indicate a target transmission mode of the broadcast multicast service with 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,

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

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

and when the terminal does not receive the DCI of the broadcast multicast within 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 apparatus 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 effect, which is not described herein again.

As shown in fig. 7, a block diagram of a switching apparatus of a broadcast multicast transmission scheme applied to a base station in an embodiment of the present invention is shown, where the apparatus 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 the downlink control information DCI includes:

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; or,

and sending second indication information 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.

It should be noted that the apparatus provided in this embodiment can implement all the method steps that can be implemented by the method embodiment on the base station side, and can achieve the same technical effect, which is not described herein again.

Fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 8, the terminal 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 understood that the bus system 805 is used to enable communications among the components connected. The bus system 805 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, 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, trackball (trackball), touch pad, or touch screen.

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

In some embodiments, memory 802 stores elements, executable modules or data structures, or a subset thereof, or an expanded set thereof, such as: an operating system 8021 and application programs 8022.

The operating system 8021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application program 8022 includes various application programs, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. A program implementing a method according to an embodiment of the present invention may be included in application program 8022.

In the embodiment of the present invention, by calling the computer program or instruction stored in the memory 802, specifically, the computer program or instruction stored in the application program 8022, the processor 801 is configured to:

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 modes: acquiring the target transmission mode indicated by the 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 methods disclosed in the embodiments of the present invention described above may be implemented in the processor 801 or implemented by the processor 801. The processor 801 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 801. The Processor 801 may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed 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 directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802, and combines the hardware to complete the steps of the method.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, 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 the 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 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, as another embodiment, when the broadcast multicast service is at least two services configured based on a cell or a 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 mode of the broadcast multicast service.

Optionally, as another embodiment, when the broadcast multicast service is at least two services configured based on a cell or a synchronization signal block SSB coverage area, and a bit number carried by the dedicated DCI signaling is smaller than a total configured number of 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 the broadcast multicast service in the same transmission mode.

Optionally, as another embodiment, a manner that 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 target original field in the DCI of the broadcast multicast into the second indication information.

Optionally, as another embodiment, the target legacy 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 and 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 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 (service quality indicator) 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: receiving fourth indication information sent by a base station through a MAC-CE, wherein the fourth indication information comprises a control resource assembly identification number and a Transmission Configuration Indication (TCI) state identification number, and the TCI state identification number is associated with an 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 within 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-level signaling; or after acquiring the target transmission mode of the broadcast multicast service, receiving configuration information of the target transmission mode sent by the base station;

the configuration information includes a control channel detection opportunity corresponding to the transmission mode and/or rate matching information of a Physical Downlink Shared Channel (PDSCH).

Optionally, as another embodiment, the control channel detection occasion is configured based on a single broadcast multicast service or configured 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 a random access channel RACH resource 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 performs a random access process when the random number is greater than a preset access factor.

Optionally, as another embodiment, the target transmission method 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 present invention can implement each process implemented by the terminal in the foregoing embodiments, and is not described herein again to avoid repetition.

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 the base station 900 are coupled together by a bus system 905. It is understood that the bus system 905 is used to enable communications among the components. The bus system 905 includes a power bus, a control bus, and a status signal bus, in addition to a data bus. For clarity of illustration, however, the various buses are labeled in fig. 9 as bus system 905, which may include any number of interconnected buses and bridges, with one or more processors, represented by processor 901, and various circuits, represented by memory 902, being linked together. The bus system may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, embodiments of the present invention will not be described any further. The bus interface provides an interface. The transceiver 904 may be a number of elements including a transmitter and a receiver that provide 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 a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

It is to be understood that the memory 902 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (ddr Data Rate SDRAM, ddr SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 902 of the systems and methods described in connection with 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 used by the processor 901 in performing operations, in particular, the processor 901 may be configured to: sending a target transmission mode of a broadcast multicast service to a terminal, and sending 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 sending the target transmission mode of the broadcast multicast service to the terminal comprises any one of the following steps: and sending the target transmission mode to a terminal through Downlink Control Information (DCI), sending the target transmission mode to the terminal through a Multicast Control Channel (MCCH), and sending the target transmission mode to the terminal through a media access control-control unit (MAC-CE).

The method disclosed in the above embodiments of the present invention may be applied to the processor 901, or implemented by the processor 901. The processor 901 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 901. The Processor 901 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps and logic blocks disclosed 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 directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 902, and the processor 901 reads the information in the memory 902, and completes the steps of the above method in combination with the hardware thereof.

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

Optionally, as another embodiment, the processor 901 is further configured to: transmitting fourth indication information through the MAC-CE, wherein the fourth indication information comprises a control resource assembly identification number and a Transmission Configuration Indication (TCI) status identification number, wherein the TCI status identification number is associated with an SSB index number.

Optionally, as another embodiment, the processor 901 is further configured to: before sending the target transmission mode of the broadcast multicast service to the terminal, sending the configuration information of the PTP mode and the configuration information of the PTM mode to the terminal through a high-level signaling; or after sending the target transmission mode of the broadcast multicast service to the terminal, sending the configuration information of the target transmission mode 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 the RACH resource of the random access channel, which is used for establishing PTP, of the terminal.

The base station provided by the embodiment of the present invention can implement each process implemented by the base station in the foregoing embodiments, and is not described herein again to avoid repetition.

The above description mainly introduces the solutions provided by the embodiments of the present invention from the perspective of electronic devices. It is understood that the electronic device provided by the embodiment of the present invention includes a hardware structure and/or a software module for performing the above functions. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software for performing the exemplary elements and algorithm steps described in connection with the embodiments disclosed herein.

Whether a function is performed as hardware or computer software drives 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.

In the embodiment of the present invention, the electronic device and the like may be divided into functional modules according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units.

The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute all or part of the steps of the method according to the embodiments of the present invention. The computer storage medium is a non-transitory (English) medium, comprising: flash memory, removable hard drive, read only memory, random access memory, magnetic or optical disk, and the like.

In another aspect, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer being capable of executing the method provided by the above-mentioned method embodiments.

On the other hand, embodiments of the present invention further provide 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 details are not repeated herein.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A switching method of broadcast multicast transmission mode is applied to a terminal, and is characterized by comprising the following steps:

2. The method of claim 1, wherein the acquiring the target transmission scheme indicated by the base station in the DCI comprises:

3. The method according to claim 2, wherein when the broadcast multicast service is at least two services configured based on a cell or a 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 mode of the broadcast multicast service.

4. The method according to claim 2, 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 a bit number carried by the dedicated DCI signaling is smaller than a total configured number of 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 the broadcast multicast service with the same transmission mode.

5. The method of claim 2, wherein the means for including the second indication information in the DCI of the broadcast multicast comprises:

6. The method of claim 5, wherein the target legacy field comprises any one of the following:

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

7. The method of claim 1, wherein when the target transmission mode is a PTM mode, the DCI for indicating the target transmission mode further includes carrier indication information.

8. The method of claim 1, wherein the acquiring the target transmission scheme indicated by the base station in the MCCH comprises:

and 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 (service quality indicator) when the broadcast multicast service is sent by taking at least one SSB coverage area as a unit.

9. The method of claim 1, wherein the acquiring the target transmission scheme indicated by the base station through a MAC-CE comprises:

receiving fourth indication information sent by a base station through a MAC-CE, wherein the fourth indication information comprises a control resource assembly identification number and a Transmission Configuration Indication (TCI) state identification number, and the TCI state identification number is associated with an SSB index number.

10. The method of claim 1, wherein the acquiring the target transmission mode by a preset timer comprises:

11. The method of claim 1, wherein the obtaining the configuration information of the target transmission scheme comprises:

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-level signaling; or,

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

12. The method of claim 11, wherein the switching of the transmission mode of the broadcast multicast is performed according to the received multicast request,

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.

13. The method of claim 1, further comprising:

when the target transmission mode is a PTP mode and the terminal is in an idle state, receiving a random access channel RACH resource configured by a base station and used for establishing PTP; or,

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

14. The method of switching transmission modes according to any one of claims 1 to 13, 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.

15. A switching method of broadcast multicast transmission mode is applied to a base station, and is characterized by comprising the following steps:

16. The method of claim 15, wherein the sending the target transmission mode to the terminal through the DCI comprises:

17. The method of claim 16, wherein when the broadcast multicast service is at least two services configured based on a cell or a 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 mode of the broadcast multicast service.

18. The method of claim 16, 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 a bit number carried by the dedicated DCI signaling is smaller than a total configured number of 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 the broadcast multicast service with the same transmission mode.

19. The method of claim 17, wherein the means for including the second indication information in the DCI of the broadcast multicast comprises:

20. The method of claim 19, wherein the target legacy field comprises any one of the following:

21. The method of claim 15, wherein when the target transmission mode is a PTM mode, the DCI for indicating the target transmission mode further includes carrier indication information.

22. The method of claim 15, wherein the sending the target transmission mode to the terminal through a multicast control channel MCCH comprises:

and third indication information periodically sent through the MCCH, wherein the third indication information comprises a target transmission mode of the broadcast multicast service, carrier or cell information for sending the broadcast multicast service, and an index number of an SSB (service quality indicator) when the broadcast multicast service is sent by taking at least one SSB coverage area as a unit.

23. The method of claim 15, wherein the sending the target transmission scheme to the terminal through a media access control-control element MAC-CE comprises:

transmitting fourth indication information through the MAC-CE, wherein the fourth indication information comprises a control resource assembly identification number and a Transmission Configuration Indication (TCI) status identification number, wherein the TCI status identification number is associated with an SSB index number.

24. The method of claim 15, wherein the sending the configuration information of the target transmission scheme to the terminal comprises:

before sending the target transmission mode of the broadcast multicast service to the terminal, sending the configuration information of the PTP mode and the configuration information of the PTM mode to the terminal through a high-level signaling; or,

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

25. The method of claim 24, wherein the switching of the transmission mode of the broadcast multicast is performed according to the received multicast request,

26. The method of claim 15, further comprising:

and when the target transmission mode is a PTP mode and the terminal is in an idle state, configuring the RACH resource of the random access channel, which is used for establishing PTP, of the terminal.

27. The method of switching transmission modes according to any one of claims 15 to 26, 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.

28. A switching device of broadcast multicast transmission mode is applied to a terminal, and is characterized by comprising:

29. A switching device of broadcast multicast transmission mode is applied to a base station, and is characterized by comprising the following components:

30. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program performs the steps of:

31. The terminal of claim 30, wherein the acquiring the target transmission mode indicated by the base station in the DCI comprises:

32. The terminal of claim 31, wherein when the broadcast multicast service is at least two services configured based on a cell or a 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 mode of the broadcast multicast service.

33. The terminal of claim 31, 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 a bit number carried by the dedicated DCI signaling is smaller than a total configured number of 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 with the same transmission mode.

34. The terminal of claim 31, wherein the means for including the second indication information in the DCI of the broadcast multicast comprises:

35. The terminal of claim 30, wherein the obtaining the target transmission mode by a preset timer comprises:

36. A base station comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program performs the steps of:

37. The base station of claim 36, wherein the sending the target transmission mode to the terminal through the downlink control information DCI comprises:

38. The base station of claim 37, wherein when the broadcast multicast service is at least two services configured based on a cell or a 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 mode of the broadcast multicast service.

39. The base station of claim 37, 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 a number of bits carried by the dedicated DCI signaling is less than a 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 with the same transmission mode.

40. The base station of claim 37, wherein the means for including the second indication information in the DCI of the broadcast multicast comprises:

41. A non-transitory computer readable storage medium, having stored thereon a computer program, which when executed by a processor, performs the steps of the method for switching a broadcast multicast transmission according to any one of claims 1 to 14 or the steps of the method for switching a broadcast multicast transmission according to any one of claims 15 to 27.