Transmission of system information on a downlink shared channel

• US 8,995,357 B2
• Filed: 04/10/2008
• Issued: 03/31/2015
• Est. Priority Date: 06/18/2007
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Dahlman, Erik, Vukajlovic, Vera
• Primary Examiner(s): Cho, Un C
• Assistant Examiner(s): Liu, Siming
• Application Number:
  US12/664,347
• Publication Number:
  US 20100297991A1
• Time in Patent Office: 2,546 Days
• Field of Search: 370/311, 370328-334, 370/468, 455/422.1
• US Class Current: 370/329
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint

Abstract

In one embodiment, a method of transmitting system information on a down link shared channel structured as successive subframes includes transmitting (400-416) system information in regularly occurring time windows, each time window spanning some number of successive subframes. The method further includes indicating (406/408) to receiving user equipment (120) which subframes within a given time window carry system information. The method and variations of it are applied, for example, to the transmission of dynamic system information on the down link shared channel or other down link channel in a 3GPP E-UTRA wireless communication network (100).

Claims

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 a plurality of subframes;

dynamically selecting which subframes within a given time window are to be used for carrying the system information; and

including an indicator in each of the selected subframes to indicate to receiving user equipment that the subframe carries system information,

wherein the wireless communication network is configured for operation in accordance with 3GPP E-UTRA standards and wherein the indicator is a System information Radio Network Temporary Identifier (SI-RNTI).

2. The method of claim 1, wherein dynamically selecting which subframes within a given time window are to be used for carrying system information comprises selecting a contiguous set of subframes within the given time window.

3. The method of claim 1, wherein dynamically selecting which subframes within a given time window are to be used for carrying system information comprises selecting a non-contiguous set of subframes within the given time window.

4. The method of claim 1, wherein dynamically selecting which subframes within a given time window are to be used for carrying system information comprises selecting which subframes to use for transmitting system information in view of competing transmission priorities associated with other control or data signaling.

5. The method of claim 1, wherein including an indicator in each of the selected subframes 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 given 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 including an indicator in each of the selected subframes 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. A network transmitter for transmitting system information on a downlink shared channel in a wireless communications network, the network transmitter configured to transmit system information in recurring time windows, each time window spanning a plurality of subframes;

the network transmitter comprising a baseband processor configured to;

dynamically select which subframes on the downlink shared channel within a given time window are to be used for carrying system information; and

include an indicator in each of the selected subframes to indicate to receiving user equipment that the subframe carries system information,

wherein the wireless communication network is configured for operation in accordance with 3GPP E-UTRA standards and wherein the indicator is a System information Radio Network Temporary Identifier (SI-RNTI).

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

transmitting system information on the downlink shared channel in regularly occurring time windows, each time window spanning a plurality of successive subframes;

dynamically selecting which subframes within the time windows are to be used for carrying system information;

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

wherein the wireless communication network is configured for operation in accordance with 3GPP E-UTRA standards and wherein the indicator is a System information Radio Network Temporary Identifier (SI-RNTI).

11. The method of claim 10, wherein indicating to receiving user equipment which subframes within the time windows carry system information includes indicating the last subframe within each time window that carries system information, thereby allowing the receiving user equipment to cease monitoring for system information within each time window.

12. A method, in a mobile station, for receiving system information on a downlink shared channel from a network transmitter in a wireless communication network, the method comprising:

monitoring for the receipt of system information on the downlink shared channel in recurring time windows used for transmission of system information, each time window spanning a plurality of subframes, by monitoring, within each time window, each subframe for an indication indicating presence of system information in the subframe and reading system information from the subframe if such information is present; and

terminating monitoring at or before the end of the time window,

wherein the wireless communication network is configured for operation in accordance with 3GPP E-UTRA standards and wherein the indicator is a System information Radio Network Temporary Identifier (SI-RNTI).

13. The method of claim 12, further comprising recognizing an end-of-system-information indicator in a subframe received within the time window and terminating monitoring for receipt of system information within the time window in response.

14. The method of claim 12, further comprising storing a default window size for monitoring for system information transmissions.

15. The method of claim 14, further comprising monitoring for system information transmissions based on a specified window size indicated in received information rather than the default window size.

16. The method of claim 12, further comprising recognizing different types of system information based on recognizing different system information indicators in different subframes.

17. A mobile station operative to receive system information on a downlink shared channel from a network transmitter in a wireless communications network, the mobile station comprising a baseband processor configured to:

monitor for the receipt of system information on the downlink shared channel in recurring time windows used for transmission of system information, each time window spanning a plurality of subframes, by monitoring within each time window, each subframe for an indication indicating presence of system information in the subframe and read system information from the subframe if such information is present; and

terminate monitoring at or before the end of the time window,

wherein the wireless communication network is configured for operation in accordance with 3GPP E-UTRA standards and wherein the indicator is a System information Radio Network Temporary Identifier (SI-RNTI).

18. The mobile station of claim 17, 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 for receipt of system information within the time window in response.

19. The mobile station of claim 17, wherein the baseband processor is configured to adapt to variable window sizes used for the time window.

20. The mobile station of claim 17, 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.

21. The mobile station of claim 17, wherein the baseband processor is configured to recognize different types of system information based on different system information indicators detected in different subframes.

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

transmitting system information in recurring time windows, each time window spanning a plurality of subframes;

dynamically selecting which subframes within a given time window are to be used for carrying the system information; and

including an indicator in each of the selected subframes to indicate to receiving user equipment that the subframe carries system information;

wherein the dynamically selecting comprises dynamically selecting subframes such that the same system information is assigned for transmission to different subframes in first and second consecutive time windows, with the different subframes occupying differing respective positions within their corresponding frames.

23. A method of transmitting system information on a downlink shared channel of a wireless communication network configured for operation in accordance with 3GPP E-UTRA standards, the system information having a fixed part and a dynamic part, the method comprising:

transmitting the dynamic part of the system information on the downlink shared channel in recurring time windows, each time window spanning a plurality of subframes, and each time window being a predetermined time interval in one or more corresponding frames;

dynamically selecting which subframes within a given time window are to be used for carrying the dynamic part of the system information;

wherein the selecting is such that subframes carrying the dynamic part of the system information within a given frame are non-consecutive, such that a second subframe not carrying any of the system information is disposed between first and third subframes carrying the dynamic part of the system information;

including an indicator in each of the selected subframes to indicate to receiving user equipment that the subframe carries system information.

24. A method of transmitting system information on a downlink shared channel of a wireless communication network configured for operation in accordance with 3GPP E-UTRA standards, the system information having a fixed part and a dynamic part, the method comprising:

transmitting the dynamic part of the system information in recurring time windows, each time window spanning a plurality of subframes, and each time window being a predetermined time interval in one or more corresponding frames;

dynamically selecting which subframes within the time windows are to be used for carrying the dynamic part of the system information;

wherein the selecting is such that subframes carrying the dynamic part of the system information for a first time window begin at a first subframe for a first frame, and the subframes carrying the dynamic part of the system information for a second time window begin at a second subframe in a second frame, where the first and second subframes have different subframe indexes relative to their corresponding frame;

including an indicator in each of the selected subframes to indicate to receiving user equipment that the subframe carries system information.