Transmission of system information on a downlink shared channel

1. A method of transmitting system information on a downlink shared channel of a wireless communication network comprising:

transmitting system information on the downlink shared channel in recurring time windows, each time window spanning one or more subframes,

wherein a set of subframes out of the one or more subframes within a time window is used for carrying the system information; and

using an indicator in each subframe in the set of subframes that is used for carrying the system information to indicate to receiving user equipment that the subframe carries system information, wherein the indicator is a System Information Radio Network Temporary Identifier (SI-RNTI).

2. The method of claim 1 , wherein the set of subframes within the time window is a contiguous set of subframes within the time window.

3. The method of claim 1 , wherein the set of subframes within the time window is a non-contiguous set of subframes within the time window.

4. The method of claim 1 , wherein the set of subframes within the time window used for carrying the system information is dynamically selected in view of competing transmission priorities associated with other control or data signaling.

5. The method of claim 1 , wherein using an indicator in each subframe in the set of subframes that is used for carrying the system information to indicate to receiving user equipment that the subframe carries system information includes using an end-of-system-information indicator in a last subframe of the time window that carries system information.

6. The method of claim 1 , further comprising varying window sizes of the recurring time windows.

7. The method of claim 1 , further comprising dynamically configuring a window size for the recurring time windows.

8. The method of claim 1 , wherein using an indicator in each subframe in the set of subframes that is used for carrying the system information to indicate to receiving user equipment that the subframe carries system information includes using different indicators corresponding to different types of system information, such that the indicator used for a particular subframe indicates the type of system information carried in that subframe.

9. The method of claim 1 , wherein the wireless communication network is an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.

10. A network transmitter comprising a baseband processor configured to:

generate system information for transmission on a downlink shared channel in recurring time windows, each time window spanning one or more subframes, wherein a set of subframes out of the one or more subframes within a time window is used for carrying the system information; and

use an indicator in each subframe in the set of subframes that is used for carrying the system information to indicate to receiving user equipment that the subframe carries system information, wherein the indicator is a System Information Radio Network Temporary Identifier (SI-RNTI).

11. The network transmitter of claim 10 , wherein the network transmitter comprises a radio base station configured for operation in accordance with 3GPP E-UTRA standards.

12. The network transmitter of claim 10 , wherein the network transmitter is configured for operation in an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.

13. A method of transmitting system information on a downlink shared channel structured as successive subframes, the method comprising:

transmitting system information in regularly occurring time windows, each time window spanning some number of successive subframes; and

indicating to receiving user equipment which subframes within the time windows carry system information, by using an indicator in each subframe within the time windows that carries system information.

14. The method of claim 13 , further comprising dynamically selecting which subframes within the time windows are used for carrying system information.

15. The method of claim 13 , wherein the indicator is a System Information Radio Network Temporary Identifier (SI-RNTI).

16. The method of claim 13 , wherein the method is performed in an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.

17. A method for a user equipment to receive system information from a supporting wireless communication network, the method comprising:

monitoring, by the user equipment, at least one subframe within a time window for an indication of presence of system information in the at least one subframe, the time window being one of a set of recurring time windows used for transmission of the system information, each of said recurring time windows spanning a number of subframes, and said indication being present in each subframe where system information is present;

and reading, by the user equipment, system information from the at least one subframe when said indication is present in the at least one subframe, wherein the indication is a System Information Radio Network Temporary Identifier (SI-RNTI).

18. The method of claim 17 , further comprising recognizing an end-of-system-information indicator in a signal received within the time window and terminating monitoring within the time window in response.

19. The method of claim 17 , further comprising adapting to changing or configurable window sizes used for the time window.

20. The method of claim 17 , further comprising storing a default window size for monitoring for system information transmissions.

21. The method of claim 20 , further comprising monitoring for system information transmissions based on a specified window size indicated in received information rather than the default window size.

22. The method of claim 17 , further comprising recognizing different types of system information based on recognizing different system information indicators in different subframes.

23. The method of claim 17 , wherein the wireless communication network is an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.

24. A user equipment comprising a baseband processor configured to:

monitor at least one subframe within a time window for an indication of presence of system information in the at least one subframe, the time window being one of a set of recurring time windows used for transmission of the system information, each of said recurring time windows spanning a number of subframes, and said indication being present in each subframe where system information is present;

and read system information from the at least one subframe when said indication is present in the at least one subframe, wherein the indication is a System Information Radio Network Temporary Identifier (SI-RNTI).

25. The user equipment of claim 24 , wherein the baseband processor is configured to recognize an end-of-system-information indicator in a subframe received within the time window and terminate monitoring within the time window in response.

26. The user equipment of claim 24 , wherein the baseband processor is configured to adapt to changing or configurable window sizes used for the time window.

27. The user equipment of claim 24 , wherein the baseband processor is configured to monitor for system information transmissions based on a specified window size indicated in received information rather than a default window size.

28. The user equipment of claim 24 , wherein the baseband processor is configured to recognize different types of system information based on different system information indicators detected in different signal subframes.

29. The user equipment of claim 24 , wherein the user equipment is configured for operation in an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.

30. A network transmitter for transmitting system information on a downlink shared channel structured as successive subframes, the network transmitter comprising a baseband processor configured to:

transmit system information in regularly occurring time windows, each time window spanning some number of successive subframes; and

indicate to receiving user equipment which subframes within the time windows carry system information, by using an indicator in each subframe within the time windows that carries system information.

31. The network transmitter of claim 30 , wherein the indicator is a System Information Radio Network Temporary Identifier (SI-RNTI).

32. The network transmitter of claim 30 , wherein the network transmitter is configured for operation in an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.

33. A method for a user equipment to receive system information transmitted in recurring time windows from a supporting wireless communication network, the method comprising:

monitoring, by the user equipment, in a time window spanning a number of subframes, for an indication of presence of system information in a subframe within the time window, wherein said indication is a System Information Radio Network Temporary Identifier (SI-RNTI) that is present in the subframe if the subframe comprises system information; and

reading, by the user equipment, system information from the subframe when the SI-RNTI is present in the subframe.

34. The method of claim 33 , wherein the wireless communication network is an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.

35. A user equipment for receiving system information transmitted in recurring time windows from a supporting wireless communication network, the user equipment comprising a baseband processor configured to:

monitor in a time window spanning a number of subframes, for an indication of presence of system information in a subframe within the time window, wherein said indication is a System Information Radio Network Temporary Identifier (SI-RNTI) that is present in the subframe if the subframe comprises system information; and

read system information from the subframe when the SI-RNTI is present in the subframe.

36. The user equipment of claim 35 , wherein the wireless communication network is an Orthogonal Frequency Division Multiplexing (OFDM) based wireless communication network.