Information transmission method and apparatus, terminal, and network side device

1 . An information transmission method, performed by a terminal, the method comprising:

obtaining configuration information of a multimedia broadcast service through radio resource control (RRC) signaling;

wherein the obtaining configuration information of a multimedia broadcast service through radio resource control RRC signaling comprises:

initiating an RRC connection event; and

obtaining the configuration information of the multimedia broadcast service through the RRC signaling in the RRC connection event;

wherein the RRC connection event comprises:

an RRC connection establishment process, or an RRC connection resume process, or an RRC connection re-establishment process;

wherein the RRC connection event is used for obtaining configuration information of a multimedia broadcast service, and a triggering condition of the RRC connection event comprises at least one of:

the terminal has a multimedia broadcast service capability;

the terminal is interested in the multimedia broadcast service;

the terminal is receiving the multimedia broadcast service; or

a configuration of the multimedia broadcast service is updated;

wherein a cause value in the RRC connection event is a cause value already defined or a newly set cause value;

the newly set cause value is a cause value different from the cause value already defined;

wherein the already defined cause value or the newly set cause value is used for multimedia broadcast service configuration; and

the cause value in the RRC connection event comprises at least one of:

a value of an establishment cause during the RRC connection establishment process;

a value of a resume cause during the RRC connection resume process; or

a value of a re-establishment cause during the RRC connection re-establishment process.

2 . The information transmission method according to claim 1 , wherein the configuration information of the multimedia broadcast service comprises at least one of:

information related to multimedia broadcast service scheduling; or

information related to service continuity of the multimedia broadcast service;

and/or

wherein the RRC signaling comprises at least one of:

an RRC reject message;

an RRC re-establishment message;

an RRC setup message;

an RRC resume message; or

an RRC release message.

3 . The information transmission method according to claim 1 , wherein unified access control (UAC) in the RRC connection establishment process or the RRC connection resume process comprises at least one of:

an access attempt is directly allowed without performing a UAC check;

a defined access value; or

a newly set access value, wherein the newly set access value is an access value different from the defined access value, and

the access value comprises at least one of a value of an access category or a value of an access identity.

4 . The information transmission method according to claim 1 , further comprising:

obtaining an indication message, wherein the indication message is used for indicating whether the configuration information of the multimedia broadcast service changes.

5 . The information transmission method according to claim 4 , wherein the indication message is a short message, and a first bit or a second bit in the short message is used for indicating whether the configuration information changes, wherein the first bit is at least one bit that has been used in the short message, and the second bit is at least one bit that has not been used in the short message; or

the indication message is downlink control information scrambled by a first radio network temporary identity (RNTI), and the first RNTI is an RNTI different from an already defined RNTI.

6 . The information transmission method according to claim 5 , wherein a terminal to which the first RNTI is applicable comprises at least one of:

a terminal having a multimedia broadcast service capability;

a terminal interested in the multimedia broadcast service; or

all terminals.

7 . An information transmission method, performed by a network side device, the method comprising:

sending configuration information of a multimedia broadcast service through radio resource control (RRC) signaling;

wherein the sending configuration information of a multimedia broadcast service through radio resource control RRC signaling comprises:

sending the configuration information of the multimedia broadcast service through the RRC signaling in the RRC connection event;

wherein the RRC connection event comprises:

an RRC connection establishment process, or an RRC connection resume process, or an RRC connection re-establishment process;

wherein the RRC connection event is used for obtaining configuration information of a multimedia broadcast service, and a triggering condition of the RRC connection event comprises at least one of:

the terminal has a multimedia broadcast service capability;

the terminal is interested in the multimedia broadcast service;

the terminal is receiving the multimedia broadcast service; or

a configuration of the multimedia broadcast service is updated;

wherein a cause value in the RRC connection event is a cause value already defined or a newly set cause value;

the newly set cause value is a cause value different from the cause value already defined;

wherein the already defined cause value or the newly set cause value is used for multimedia broadcast service configuration; and

the cause value in the RRC connection event comprises at least one of:

a value of an establishment cause during the RRC connection establishment process;

a value of a resume cause during the RRC connection resume process; or

a value of a re-establishment cause during the RRC connection re-establishment process.

8 . The information transmission method according to claim 7 , wherein the configuration information of the multimedia broadcast service comprises at least one of:

information related to multimedia broadcast service scheduling; or

information related to service continuity of the multimedia broadcast service;

and/or

wherein the RRC signaling comprises at least one of:

an RRC reject message;

an RRC re-establishment message;

an RRC setup message;

an RRC resume message; or

an RRC release message.

9 . The information transmission method according to claim 7 , further comprising:

sending an indication message, wherein the indication message is used for indicating whether the configuration information of the multimedia broadcast service changes.

10 . The information transmission method according to claim 9 , wherein the indication message is a short message, and a first bit or a second bit in the short message is used for indicating whether the configuration information changes, wherein the first bit is at least one bit that has been used in the short message, and the second bit is at least one bit that has not been used in the short message; or

the indication message is downlink control information scrambled by a first radio network temporary identity (RNTI), and the first RNTI is an RNTI different from an already defined RNTI.

11 . The information transmission method according to claim 10 , wherein a terminal to which the first RNTI is applicable comprises at least one of:

a terminal having a multimedia broadcast service capability;

a terminal interested in the multimedia broadcast service; or

all terminals.

12 . A network side device, comprising a processor, a memory, and a program or an instruction stored in the memory and executable by the processor, the program or instruction, when executed by the processor, implementing steps of the information transmission method according to claim 7 .

13 . The network side device according to claim 12 , wherein the steps further comprises:

sending an indication message, wherein the indication message is used for indicating whether the configuration information of the multimedia broadcast service changes.

14 . The network side device according to claim 13 , wherein the indication message is a short message, and a first bit or a second bit in the short message is used for indicating whether the configuration information changes, wherein the first bit is at least one bit that has been used in the short message, and the second bit is at least one bit that has not been used in the short message; or

the indication message is downlink control information scrambled by a first radio network temporary identity (RNTI), and the first RNTI is an RNTI different from an already defined RNTI.

15 . A terminal, comprising a processor, a memory, and an instruction stored in the memory and executable by the processor, the instruction, when executed by the processor, implementing steps of an information transmission method, the steps comprising:

obtaining configuration information of a multimedia broadcast service through radio resource control (RRC) signaling;

wherein the obtaining configuration information of a multimedia broadcast service through radio resource control RRC signaling comprises:

initiating an RRC connection event; and

obtaining the configuration information of the multimedia broadcast service through the RRC signaling in the RRC connection event;

wherein the RRC connection event comprises:

an RRC connection establishment process, or an RRC connection resume process, or an RRC connection re-establishment process;

wherein the RRC connection event is used for obtaining configuration information of a multimedia broadcast service, and a triggering condition of the RRC connection event comprises at least one of:

the terminal has a multimedia broadcast service capability;

the terminal is interested in the multimedia broadcast service;

the terminal is receiving the multimedia broadcast service; or

a configuration of the multimedia broadcast service is updated;

wherein a cause value in the RRC connection event is a cause value already defined or a newly set cause value;

the newly set cause value is a cause value different from the cause value already defined;

wherein the already defined cause value or the newly set cause value is used for multimedia broadcast service configuration; and

the cause value in the RRC connection event comprises at least one of:

a value of an establishment cause during the RRC connection establishment process;

a value of a resume cause during the RRC connection resume process; or

a value of a re-establishment cause during the RRC connection re-establishment process.

16 . The terminal according to claim 15 , wherein unified access control (UAC) in the RRC connection establishment process or the RRC connection resume process comprises at least one of:

an access attempt is directly allowed without performing a UAC check;

a defined access value; or

a newly set access value, wherein the newly set access value is an access value different from the defined access value, and

the access value comprises at least one of a value of an access category or a value of an access identity.

17 . The terminal according to claim 15 , wherein the steps further comprises:

obtaining an indication message, wherein the indication message is used for indicating whether the configuration information of the multimedia broadcast service changes.