HIERARCHICAL PILOT STRUCTURE IN WIRELESS COMMUNICATION SYSTEMS

• US 20090225722A1
• Filed: 02/06/2009
• Published: 09/10/2009
• Est. Priority Date: 03/10/2008
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: MONDAL, BISHWARUP, THOMAS, TIMOTHY A., TALUKDAR, ANUP K., CUDAK, MARK C., WANG, FAN, VOOK, FREDERICK W.
• Granted Patent: US 8,537,790 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 25/03248 Arrangements for operating in conjunction with other apparatus
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

A method for communicating control channel information in a wireless communication system, including transmitting a super-frame having a time-frequency resource region containing an allocation control channel and multiple pilot elements, at least some of which are associated with the allocation control channel, and indicating, in a configuration information control channel of the super-frame, a characteristic of the pilots elements associated with the allocation control channel.

Claims

4-1. The entity of claim 1, each of the multiple time-frequency tiles tile has a rectangular shape with the same number of subcarriers and the same number of pilot elements.

5-2. The entity of claim 4, the time-frequency resource region containing a time-frequency resource block, the frequency dimension of the time-frequency resource block is an integer multiple of the frequency dimension of the time-frequency tile.

9. A method in a wireless network infrastructure entity, the method comprising:

transmitting a time-frequency resource region containing an allocation control channel and multiple pilot elements,

the allocation control channel includes multiple time-frequency tiles,

each time-frequency tile comprises multiple subcarriers and at least one of the multiple pilot elements.

10. The method of claim 9, the at least one pilot element of each tile is a dedicated pilot element, wherein the dedicated pilot element is functionally associated only with the multiple subcarriers of the tile of which the dedicated pilot element is a part.

11. The method of claim 9, the allocation control channel containing at least one resource allocation message constituted by multiple time-frequency tiles.

12. The method of claim 11, each of the multiple time-frequency tiles comprises the same number of subcarriers and the same number of pilot elements.

13. The method of claim 11, distributing each of the multiple time-frequency tiles constituting the resource allocation message along a frequency dimension of the time-frequency resource region, wherein at least some of the multiple time-frequency tiles constituting the resource allocation message are interleaved with time-frequency tiles that do not constitute the resource allocation message.

14. The method of claim 9, each of the multiple time-frequency tiles tile has a rectangular shape with the same number of subcarriers and the same number of pilot elements.

15. The method of claim 14, the time-frequency resource region containing a time-frequency resource block, the frequency dimension of the time-frequency resource block is an integer multiple of the frequency dimension of the time-frequency tile.

16. The method of claim 14, the time-frequency resource region containing a time-frequency resource block, the time dimension of the time-frequency resource block is an integer multiple of the time dimension of the time-frequency tile.

17. The method of claim 9, providing the allocation control channel within a first in time sub-frame adjacent to a second in time sub-frame that is devoid of a control channel, the first and second sub-frames are located within the time-frequency resource region.

18. The method of claim 17, wherein the first in time sub-frame includes a data channel.

19. A wireless network infrastructure entity comprising:

a transceiver;

a controller coupled to the transceiver,

the controller configured to cause the transceiver to transmit a time-frequency resource region containing a control channel, a resource block and multiple pilot elements,

the resource block having multiple sub-carriers;

providing information for indicating which sub-carriers associated with the resource block are pilot elements based on a channel metric.

20. The entity of claim 19, wherein the channel metric is a velocity metric, providing information for indicating which sub-carriers associated with the resource block are pilot elements based on the velocity metric.

21. The method of claim 19, the controller configured to indicate, in the allocation control channel, a number of spatial streams transmitted on the resource block.

22. The method of claim 19,

the controller configured to cause the transceiver to transmit a set of pilot sequences on the multiple pilot elements, and

the controller configured to indicate, in the control channel, which pilot sequences of the set of pilot sequences are assigned to a particular user.

23. The method of claim 19, providing the information for indicating which sub-carriers associated with the resource block are pilot elements based on a channel metric selected from a group comprising a velocity metric, data rate, delay spread.

24. A method in a wireless network infrastructure entity, the method comprising:

transmitting a time-frequency resource region containing a control channel, a resource block and multiple pilot elements,

the resource block having multiple sub-carriers;

providing information for indicating which sub-carriers associated with the resource block are pilot elements based on a channel metric.

25. The method of claim 24, wherein the channel metric is a velocity metric, providing information for indicating which sub-carriers associated with the resource block are pilot elements based on the velocity metric.

26. The method of claim 24, indicating, in the allocation control channel, a number of spatial streams transmitted on the resource block.

27. The method of claim 24,

transmitting a set of pilot sequences on the multiple pilot elements,

indicating, in the control channel, which pilot sequences of the set of pilot sequences are assigned to a particular user.

28. The method of claim 24, providing the information for indicating which sub-carriers associated with the resource block are pilot elements based on a channel metric selected from a group comprising a velocity metric, data rate, delay spread.