Method for transmitting system information and related devices

1. A method for transmitting system information, comprising:

receiving, by a base station, a system information request sent by a terminal; and

sending, by the base station, the system information to the terminal according to the system information request, wherein the system information comprises minimum system information and other system information, and wherein the minimum system information comprises a bitmap field for indicating a system information block existing in the other system information.

2. The method of claim 1 , wherein

the terminal is in an active state; and

receiving, by the base station, the system information request sent by the terminal comprises:

receiving, by the base station, the system information request sent by the terminal in the active state through a radio resource control message.

3. The method of claim 2 , wherein

the system information request comprises a broadcast transmission mode; and

sending, by the base station, the system information to the terminal according to the system information request comprises:

sending, by the base station, the system information to the terminal in the active state in the broadcast transmission mode according to the system information request.

4. The method of claim 2 , further comprising:

after receiving, by the base station, the system information request sent by the terminal in the active state through the radio resource control message:

determining, by the base station, a number of terminals that send the system information request; and

determining, by the base station, a transmission mode for sending the system information to the terminals according to the number of the terminals.

5. The method of claim 4 , wherein determining, by the base station, the transmission mode for sending the system information to the terminals according to the number of the terminals comprises:

when the number of the terminals is greater than a preset threshold, determining to send the system information to the terminals in a broadcast transmission mode; and

when the number of the terminals is not greater than the preset threshold, determining to send the system information to the terminals through a radio resource control dedicated signaling.

6. A method for transmitting system information, comprising:

sending, by a terminal, a system information request to a base station; and

receiving, by the terminal, the system information sent by the base station, wherein the system information comprises minimum system information and other system information, and wherein the minimum system information comprises a bitmap field for indicating a system information block existing in the other system information.

7. The method of claim 6 , wherein

the terminal is in an active state; and

sending, by the terminal, the system information request to the base station comprises:

sending, by the terminal, the system information request to the base station through a radio resource control message.

8. The method of claim 7 , wherein

the system information request comprises a broadcast transmission mode; and

receiving, by the terminal, the system information sent by the base station comprises:

receiving, by the terminal, the system information sent by the base station in the broadcast transmission mode.

9. The method of claim 6 , wherein receiving, by the terminal, the system information sent by the base station comprises:

reading, by the terminal, the bitmap field; and

acquiring, by the terminal, the system information block existing in the other system information according to the bitmap field.

10. The method of claim 9 , wherein

the system information request comprises a broadcast transmission mode; and

receiving, by the terminal, the system information sent by the base station comprises:

receiving, by the terminal, the system information sent by the base station in the broadcast transmission mode.

11. The method of claim 6 , wherein

the system information request comprises a broadcast transmission mode; and

receiving, by the terminal, the system information sent by the base station comprises:

receiving, by the terminal, the system information sent by the base station in the broadcast transmission mode.

12. A base station, comprising:

at least one processor; and

a computer readable storage, coupled with the at least one processor and storing at least one computer executable instruction therein which, when executed by the at least one processor, causes the at least one processor to:

receive a system information request sent by a terminal; and

send system information to the terminal according to the system information request, wherein the system information comprises minimum system information and other system information, and wherein the minimum system information comprises a bitmap field for indicating a system information block existing in the other system information.

13. The base station of claim 12 , wherein the terminal is in an active state and the at least one processor is configured to receive the system information request sent by the terminal in the active state through a radio resource control message.

14. The base station of claim 13 , wherein

the system information request comprises a broadcast transmission mode; and

the at least one processor is configured to send the system information to the terminal in the active state in the broadcast transmission mode according to the system information request.

15. The base station of claim 13 , wherein the at least one processor is further configured to:

determine a number of terminals that send the system information request; and

determine a transmission mode for sending the system information to the terminal according to the number of the terminals.

16. The base station of claim 15 , wherein the at least one processor is further configured to:

when the number of the terminals is greater than a preset threshold, determine to send the system information to the terminals in a broadcast transmission mode; and

when the number of the terminals is not greater than the preset threshold, determine to send the system information to the terminals through a radio resource control dedicated signaling.

17. A terminal, comprising:

at least one processor; and

a computer readable storage, coupled with the at least one processor and storing at least one computer executable instruction therein which, when executed by the at least one processor, causes the at least one processor to:

send a system information request to a base station; and

receive system information sent by the base station, wherein the system information comprises minimum system information and other system information, and wherein the minimum system information comprises a bitmap field for indicating a system information block existing in the other system information.

18. The terminal of claim 17 , wherein the at least one processor is configured to send the system information request to the base station through a radio resource control message.

19. The terminal of claim 17 , wherein the at least one processor is further configured to read the bitmap field and to acquire the system information block existing in the other system information according to the bitmap field.

20. The terminal of claim 17 , wherein

the system information request comprises a broadcast transmission mode; and

the at least one processor is configured to receive the system information sent by the base station in the broadcast transmission mode.