Apparatus and method for adding burst of single-input multiple-output mode or collaborative spatial multiplexing mode to frame in spatial multiplexing system

• US 9,166,668 B2
• Filed: 03/06/2009
• Issued: 10/20/2015
• Est. Priority Date: 03/06/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ahn, Byung-Chan, Maeng, Seung-Joo
• Primary Examiner(s): Zaidi, Iqbal
• Application Number:
  US12/381,085
• Publication Number:
  US 20090225783A1
• Time in Patent Office: 2,419 Days
• Field of Search: 370/230, 370/396, 370329-339, 370/342, 370376-380, 370491-497, 370458-461, 370500-545, 370/74, 370/98, 370/68, 455450-460
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04J 3/24 in which the allocation is indicated by an address the different channels being transmitted sequentiallyH04J3/17 takes precedence; in computers G06F12/00, G06F13/00 code multiplex systems H04J13/00; selecting techniques H04Q; relay systems H04B7/14
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

A system and method for adding a burst of a single-input multiple-output mode or collaborative spatial multiplexing mode to a frame in a spatial multiplexing system. A base station is configured to add a burst of a single-input multiple-output mode to a frame in a spatial multiplexing system. The system and method includes backing up a pilot pattern and a number of slots allocated for connections with terminals; releasing slots allocated for a burst; resetting a pilot pattern of a collaborative spatial multiplexing mode burst of the terminals: and recalculating the number of remaining slots; comparing the number of slots that can be additionally allocated to the single-input multiple-output mode with the number of slots released in the releasing step; and determining a transmission format.

Claims

1. A method for performing, by a base station, an uplink scheduling in a spatial multiplexing system, the method comprising:

determining one of a single-input multiple-output (SIMO) mode and a collaborative spatial multiplexing (C-SM) mode as an uplink transmission mode to be used by a mobile station, based on at least one of channel status information and an uplink transmission power of the mobile station;

determining a transmission format of the base station, the transmission format corresponding to the determined uplink transmission mode from the SIMO mode and the C-SM mode;

adjusting a disposition of previously allocated uplink bursts of the SIMO mode and the C-SM mode within a frame, for allocation of an uplink burst according to the determined uplink transmission mode;

generating resource allocating information including mode information regarding the determined uplink transmission mode, format information regarding the determined transmission format, and position information regarding allocation of the uplink bursts according to the adjusted disposition; and

transmitting the resource allocating information to the mobile station.

2. The method as claimed in claim 1, wherein adjusting the disposition of the previously allocated uplink bursts comprises:

if the determined uplink transmission mode is the SIMO mode, backing up a SIMO pilot pattern, which is a pilot pattern for uplink bursts of the SIMO mode, C-SM pilot patterns, which are pilot patterns for uplink bursts of the C-SM mode, and a number of total slots allocated for the previously allocated uplink bursts of the SIMO mode and the C-SM mode, and releasing the total slots;

resetting the C-SM pilot patterns, and recalculating a number of remaining slots;

if uplink bursts for which a pilot pattern has not been determined remain, selecting an uplink burst to which most slots are allocated from among the remaining uplink bursts;

if a pilot pattern for a mobile station corresponding to the selected uplink burst has not been determined, comparing a number of slots that are able to be additionally allocated to a first pilot pattern among the C-SM pilot patterns with a number of slots that are able to be additionally allocated to a second pilot pattern among the C-SM pilot patterns;

determining a pilot pattern for the selected uplink burst according to a result of the comparison; and

adjusting a disposition of the selected uplink burst in the frame based on the pilot pattern determined for the selected uplink burst.

3. The method as claimed in claim 2, wherein determining the pilot pattern for the selected uplink burst according to the result of the comparison comprises:

performing a first comparison that compares a number of allocation slots of the selected uplink burst with the number of slots that are able to be additionally allocated to the first pilot pattern, and determining the pilot pattern for the selected uplink burst according to a result of the first comparison, if the number of slots that are able to be additionally allocated to the first pilot pattern is not less than the number of slots that are able to be additionally allocated to the second pilot pattern; and

performing a second comparison that compares the number of allocation slots of the selected uplink burst with the number of slots that are able to be additionally allocated to the second pilot pattern, and determining the pilot pattern for the selected uplink burst according to a result of the second comparison, if the number of slots that are able to be additionally allocated to the first pilot pattern is less than the number of slots that are able to be additionally allocated to the second pilot pattern.

4. The method as claimed in claim 3, wherein determining the pilot pattern for the selected uplink burst according to the result of the first comparison comprises determining the pilot pattern for the selected uplink burst as the first pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the first pilot pattern.

5. The method as claimed in claim 3, wherein determining the pilot pattern for the selected uplink burst according to the result of the first comparison comprises restoring the backed-up number of slots and the backed-up pilot patterns, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the first pilot pattern.

6. The method as claimed in claim 3, wherein determining the pilot pattern for the selected uplink burst according to the result of the second comparison comprises determining the pilot pattern for the selected uplink burst as the second pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the second pilot pattern.

7. The method as claimed in claim 3, wherein determining the pilot pattern for the selected uplink burst according to the result of the second comparison comprises restoring the backed-up number of slots and the backed-up pilot patterns, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the second pilot pattern.

8. The method as claimed in claim 2, further comprising:

if the pilot pattern for the mobile station corresponding to the selected uplink burst has been determined, comparing a number of allocation slots of the selected uplink burst with a number of remaining slots of the pilot pattern determined for the mobile station;

if the number of allocation slots of the selected uplink burst is less than the number of remaining slots of the determined pilot pattern, adjusting disposition of the selected uplink burst in the frame based on the pilot pattern determined for the mobile station; and

if the number of allocation slots of the selected uplink burst is not less than the number of remaining slots of the determined pilot pattern, restoring the backed-up number of slots and the backed-up pilot patterns.

9. The method as claimed in claim 1, wherein adjusting the disposition of the previously allocated uplink bursts comprises:

if the determined uplink transmission mode is the C-SM mode, backing up a SIMO pilot pattern, which is a pilot pattern for uplink bursts of the SIMO mode, C-SM pilot patterns, and a number of total slots allocated for the previously allocated uplink bursts of the SIMO mode and the C-SM mode, and releasing the total slots;

resetting the C-SM pilot patterns, and recalculating a number of remaining slots;

if uplink bursts for which a pilot pattern has not been determined remain, selecting an uplink burst to which most slots are allocated from among the remaining uplink bursts;

if a pilot pattern for a mobile station corresponding to the selected uplink burst has not been determined, checking if there is an uplink burst allocated to the mobile station;

if there is not the uplink burst allocated to the mobile station, performing a first comparison that compares a number of allocation slots of the selected uplink burst with a number of slots that are able to be additionally allocated to a first pilot pattern among the C-SM pilot patterns;

determining a pilot pattern for the selected uplink burst according to a result of the first comparison; and

adjusting a disposition of the selected uplink burst in the frame based on the pilot pattern determined for the selected uplink burst.

10. The method as claimed in claim 9, wherein determining the pilot pattern for the selected uplink burst according to the result of the first comparison comprises:

determining the pilot pattern for the selected uplink burst as the first pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the first pilot pattern; and

in a second comparison, comparing the number of allocation slots of the selected uplink burst with the number of slots that are able to be additionally allocated to the second pilot pattern, and determining the pilot pattern for the selected uplink burst according to a result of the second comparison, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the first pilot pattern.

11. The method as claimed in claim 10, wherein determining the pilot pattern for the selected uplink burst according to the result of the second comparison comprises:

determining the pilot pattern for the selected uplink burst as the second pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the second pilot pattern.

12. The method as claimed in claim 10, wherein determining the pilot pattern for the selected uplink burst according to the result of the second comparison comprises

restoring the backed-up number of slots and the backed-up pilot patterns, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the second pilot pattern.

13. The method as claimed in claim 9, further comprising:

if the pilot pattern for the mobile station corresponding to the selected uplink burst has been determined, comparing the number of allocation slots of the selected uplink burst with a number of remaining slots of the pilot pattern determined for the mobile station;

if the number of allocation slots of the selected uplink burst is less than the number of remaining slots of the determined pilot pattern, adjusting the disposition of the selected uplink burst in the frame based on the pilot pattern determined for the mobile station; and

if the number of allocation slots of the selected uplink burst is not less than the number of remaining slots of the determined pilot pattern, restoring the backed-up number of slots and the backed-up pilot pattern.

27. The method as claimed in claim 1, wherein adjusting the disposition of the previously allocated uplink bursts comprises:

if the determined uplink transmission mode is the SIMO mode, evenly dividing and allocating the previously allocated uplink bursts of the C-SM mode to a first layer using a first pilot pattern and a second layer using a second pilot pattern; and

if the determined uplink transmission mode is the C-SM mode, allocating the previously allocated uplink bursts of the C-SM mode to one of the first layer and the second layer.

29. The method as claimed in claim 1, wherein if a transmission format of the base station corresponding to one of the SIMO mode and the C-SM mode is determined based on the determined uplink transmission mode, the resource allocating information further comprises information regarding the determined transmission format.

14. A base station comprising:

an uplink scheduler configured to;

determine one of a single-input multiple-output (SIMO) mode and a collaborative spatial multiplexing (C-SM) mode as an uplink transmission mode to be used by a mobile station, based on at least one of channel status information and an uplink transmission power of the mobile station;

determine a transmission format of the base station, the transmission format corresponding to the determined uplink transmission mode from the SIMO mode and the C-SM mode;

adjust a disposition of previously allocated uplink bursts of the SIMO mode and the C-SM mode in a frame, for allocation of an uplink burst according to the determined uplink transmission mode;

a controller configured to generate resource allocating information including mode information regarding the determined uplink transmission mode, format information regarding the determined transmission format, and position information regarding allocation of the uplink burst according to the adjusted disposition; and

a transmitter configured to transmit the resource allocating information to the mobile station.

15. The base station as claimed in claim 14, wherein, in changing the disposition of the previously allocated uplink bursts, the uplink scheduler is further configured to:

if the determined uplink transmission mode is the SIMO mode, back up a SIMO pilot pattern, which is a pilot pattern for uplink bursts of the SIMO mode, C-SM pilot patterns, which are pilot patterns for uplink bursts of the C-SM mode, and a number of total slots allocated for the previously allocated uplink bursts of the SIMO mode and the C-SM mode, and release the total slots;

reset the C-SM pilot patterns, and recalculate a number of remaining slots;

if uplink bursts for which a pilot pattern has not been determined remain, select an uplink burst to which most slots are allocated from among the remaining uplink bursts;

if a pilot pattern for a mobile station corresponding to the selected uplink burst has not been determined, compare a number of slots that are able to be additionally allocated to a pilot pattern among the C-SM pilot patterns with a number of slots that are able to be additionally allocated to a second pilot pattern among the C-SM pilot patterns;

determine a pilot pattern for the selected uplink burst according to a result of the comparison; and

adjust a disposition of the selected uplink burst in the frame based on the pilot pattern determined for the selected uplink burst.

16. The base station as claimed in claim 15, wherein in determining the pilot pattern for the selected uplink burst according to the result of the comparison, the uplink scheduler is further configured to:

perform a first comparison that compares a number of allocation slots of the selected uplink burst with the number of slots that are able to be additionally allocated to the first pilot pattern, and determine the pilot pattern for the selected uplink burst according to a result of the first comparison, if the number of slots that are able to be additionally allocated to the first pilot pattern is not less than the number of slots that are able to be additionally allocated to the second pilot pattern; and

perform a second comparison that compares the number of allocation slots of the selected uplink burst with the number of slots that are able to be additionally allocated to the second pilot pattern, and determine the pilot pattern for the selected uplink burst according to a result of the second comparison, if the number of slots that are able to be additionally allocated to the first pilot pattern is less than the number of slots that can are able to be additionally allocated to the second pilot pattern.

17. The base station as claimed in claim 16, wherein, in determining the pilot pattern for the selected uplink burst according to the result of the first comparison the uplink scheduler is further configured to determine the pilot pattern for the selected uplink burst as the first pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the first pilot pattern.

18. The base station as claimed in claim 16, wherein, in determining the pilot pattern for the selected uplink burst according to the result of the first comparison, the uplink scheduler is further configured to restore the backed-up number of slots and the backed-up pilot patterns, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the first pilot pattern.

19. The base station as claimed in claim 16, wherein, in determining the pilot pattern for the selected uplink burst according to the result of the second comparison, the uplink scheduler is further configured to determine a pilot pattern for the selected uplink burst to be the second pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the second pilot pattern.

20. The base station as claimed in claim 16, wherein, in determining the pilot pattern for the selected uplink burst according to the result of the second comparison, the uplink scheduler is further configured to restore the backed-up number of slots and the backed-up pilot patterns, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the second pilot pattern.

21. The base station as claimed in claim 15, the uplink scheduler is further configured to:

if the pilot pattern for the mobile station corresponding to the selected uplink burst has been determined, compare a number of allocation slots of the selected uplink burst with a number of remaining slots of the pilot pattern determined for the mobile station;

if the number of allocation slots of the selected uplink burst is less than the number of remaining slots of the determined pilot pattern, adjust a disposition of the selected uplink burst in the frame based on the pilot pattern determined for the mobile station; and

if the number of allocation slots of the selected uplink burst is not less than the number of remaining slots of the determined pilot pattern, restore the backed-up number of slots and the backed-up pilot patterns.

22. The base station as claimed in claim 14, wherein, in adjusting the disposition of the previously allocated uplink bursts, the uplink scheduler is further configured to:

if the determined uplink transmission mode is the C-SM mode, back up a SIMO pilot pattern, which is a pilot pattern for uplink bursts of the SIMO mode, C-SM pilot patterns, and a number of total slots allocated for the previously allocated uplink bursts of the SIMO mode and the C-SM mode, and release the total slots;

reset the C-SM pilot patterns, and recalculate a number of remaining slots;

if uplink bursts for which a pilot pattern has not been determined remain, select a uplink burst to which most slots are allocated from among the remaining uplink bursts;

if a pilot pattern for a mobile station corresponding to the selected uplink burst has not been determined, check if there is a uplink burst allocated to the mobile station;

if there is not the uplink burst allocated to the mobile station, perform a first comparison that compares a number of allocation slots of the selected uplink burst with a number of slots that are able to be additionally allocated to a first pilot pattern among the C-SM pilot patterns;

determine a pilot pattern for the selected uplink burst according to a result of the first comparison; and

adjust a disposition of the selected uplink burst in the frame based on the pilot pattern determined for the selected uplink burst.

23. The base station as claimed in claim 22, wherein, in determining the pilot pattern for the selected uplink burst according to the result of the first comparison, the uplink scheduler is further configured to:

determine the pilot pattern for the selected uplink burst as the first pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the first pilot pattern; and

perform a second comparison that compares the number of allocation slots of the selected uplink burst with the number of slots that are able to be additionally allocated to the second pilot pattern, and determine the pilot pattern for the selected uplink burst according to a result of the second comparison, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the first pilot pattern.

24. The base station as claimed in claim 23, wherein, in determining the pilot pattern for the selected uplink burst according to the result of the second comparison, the uplink scheduler is further configured to determine the pilot pattern for the selected uplink burst as the second pilot pattern, if the number of allocation slots of the selected uplink burst is less than the number of slots that are able to be additionally allocated to the pilot pattern B.

25. The base station as claimed in claim 23, wherein, in determining the pilot pattern for the selected uplink burst according to the result of the second comparison, the uplink scheduler is further configured to restore the backed-up number of slots and the backed-up pilot patterns, if the number of allocation slots of the selected uplink burst is not less than the number of slots that are able to be additionally allocated to the pilot pattern B.

26. The base station as claimed in claim 22, the uplink scheduler is further configured to:

if the pilot pattern for the mobile station corresponding to the selected uplink burst has been determined, compare the number of allocation slots of the selected uplink burst with a number of remaining slots of the pilot pattern determined for the mobile station;

if the number of allocation slots of the selected uplink burst is less than the number of remaining slots of the determined pilot pattern, adjust the disposition of the selected uplink burst in the frame based on the pilot pattern determined for the mobile station; and

if the number of allocation slots of the selected uplink burst is not less than the number of remaining slots of the determined pilot pattern, restore the backed-up number of slots and the backed-up pilot patterns.

28. The base station as claimed in claim 14, wherein uplink scheduler is further configured to:

if the determined uplink transmission mode is the SIMO mode, evenly divide and allocate the previously allocated uplink bursts of the C-SM mode to a first layer using a first pilot pattern and a second layer using a second pilot pattern; and

if the determined uplink transmission mode is the C-SM mode, allocate the previously allocated uplink bursts of the C-SM mode to one of the first layer and the second layer.

30. The base station as claimed in claim 14, wherein if a transmission format of the base station corresponding to one of the SIMO mode and the C-SM mode is determined by the uplink scheduler based on the determined uplink transmission mode, the resource allocating information further comprises info nation regarding the determined transmission format.