IP Library › Granted Patent US 8,681,719

Granted Patent B2

US 8,681,719 · App. 12/910,551 · Granted Mar 25, 2014

Systems, apparatus and methods for facilitating frequency reuse for downlink control channels

Inventors: Juan Montojo (San Diego, CA); Wanshi Chen (San Diego, CA); Aleksandar Damnjanovic (Del Mar, CA)

Assignee: QUALCOMM Incorporated

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Quick Facts

Patent No.: US 8,681,719
App. No.: 12/910,551
Granted: Mar 25, 2014
Kind: B2

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Abstract

Systems and methods for frequency reuse on downlink control channels (DLCCs) are provided. One method can include determining a first number of symbols to support transmission of control information on a DLCC, and configuring a second number of symbols for transmission of the control information on the DLCC, wherein the second number of symbols is greater than the first number of symbols. The method can also include assigning a number of DLCCs based on the second number of symbols, and transmitting control information over an assigned number of DLCCs to achieve an effective reuse factor less than one. Another method can include identifying fractions of bandwidth in a system having cells, and allocating at least one of the cells to at least one of the fractions of bandwidth in a system. Resource element groups allocated to the fractions of bandwidth can be coordinated across cells to provide frequency reuse.

Claims (50)

1. A method for facilitating frequency reuse on downlink control channels in a wireless communication system by overbooking the downlink control channel, the method comprising:

determining a first number of symbols to support transmission of control information on a downlink control channel, wherein the first number of symbols to support transmission of control information on a downlink control channel is a minimum number for supporting transmission;

overbooking the downlink control channel by configuring a second number of symbols for transmission of control information on the downlink control channel, wherein the second number of symbols for transmission of control information on the downlink control channel is greater than the first number of symbols;

wherein the overbooking further comprises assigning a number of downlink control channels based, at least, on the second number of symbols for transmission of control information on the downlink control channel, wherein the number of downlink control channels based, at least, on the second number of symbols for transmission of control information on the downlink control channel is increased relative to a number of downlink control channels corresponding to the first number of symbols to support transmission of control information on a downlink control channel; and

transmitting control information over the assigned number of downlink control channels to facilitate frequency reuse based on the overbooking, wherein the transmitted control information comprises a subset of the configured second number of symbols equal to the determined first number of symbols to facilitate the frequency reuse.

2. The method of claim 1 , wherein the transmitting of the control information over the assigned number of downlink control channels is configured to achieve an effective reuse factor less than one.

3. The method of claim 2 , wherein the effective reuse factor is no more than the first number of symbols to support transmission of control information on a downlink control channel divided by the second number of symbols for transmission of control information on the downlink control channel.

4. The method of claim 1 , wherein the downlink control channel is a physical downlink control channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

5. The method of claim 1 , wherein the downlink control channel is at least one of a physical control format indicator channel or a physical hybrid automatic repeat request indicator channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

6. The method of claim 1 , wherein the second number of symbols for transmission of control information on the downlink control channel is based, at least, on a system bandwidth of the wireless communication system, a subframe type of the wireless communication system or channel conditions in the wireless communication system.

7. The method of claim 6 , wherein the second number of symbols for transmission of control information on the downlink control channel is three symbols if the system bandwidth of the wireless communication system is greater than 10 resource blocks.

8. The method of claim 6 , wherein the second number of symbols for transmission of control information on the downlink control channel is up to two symbols if the subframe type of the wireless communication system is a multimedia broadcast over a single frequency network or a special subframe in the wireless communication system operating according a time division duplex protocol.

9. A computer program product, comprising:

a non-transitory computer-readable medium, comprising:

a first set of codes for causing a computer to determine a first number of symbols to support transmission of control information on a downlink control channel, wherein the first number of symbols to support transmission of control information on a downlink control channel is a minimum number for supporting transmission;

a second set of codes for causing the computer to overbook the downlink control channel by configuring a second number of symbols for transmission of control information on the downlink control channel, wherein the second number of symbols for transmission of control information on the downlink control channel is greater than the first number of symbols;

a third set of codes for causing the computer to transmit control information over the assigned number of downlink control channels to facilitate frequency reuse based on the overbooking, wherein the transmitted control information comprises a subset of the configured second number of symbols equal to the determined first number of symbols to facilitate the frequency reuse.

10. The computer program product of claim 9 , wherein the fourth set of codes for causing the computer to transmit the control information over the assigned number of downlink control channels is configured to achieve an effective reuse factor less than one.

11. The computer program product of claim 10 , wherein the effective reuse factor is no more than the first number of symbols to support transmission of control information on a downlink control channel divided by the second number of symbols for transmission of control information on the downlink control channel.

12. The computer program product of claim 9 , wherein the downlink control channel is a physical downlink control channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

13. The computer program product of claim 9 , wherein the downlink control channel is at least one of a physical control format indicator channel or a physical hybrid automatic repeat request indicator channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

14. The computer program product of claim 9 , wherein the second number of symbols for transmission of control information on the downlink control channel is based, at least, on a system bandwidth of a wireless communication system including the computer, a subframe type of the wireless communication system including the computer or channel conditions in the wireless communication system including the computer.

15. The computer program product of claim 14 , wherein the second number of symbols for transmission of control information on the downlink control channel is three symbols if the system bandwidth of the wireless communication system including the computer is greater than 10 resource blocks.

16. The computer program product of claim 14 , wherein the second number of symbols for transmission of control information on the downlink control channel is up to two symbols if the subframe type of the wireless communication system including the computer is a multimedia broadcast over a single frequency network or a special subframe in the wireless communication system including the computer operating according a time division duplex protocol.

17. An apparatus, comprising:

means for determining a first number of symbols to support transmission of control information on a downlink control channel, wherein the first number of symbols to support transmission of control information on a downlink control channel is a minimum number for supporting transmission;

means for overbooking the downlink control channel by configuring a second number of symbols for transmission of control information on the downlink control channel, wherein the second number of symbols for transmission of control information on the downlink control channel is greater than the first number of symbols;

means for transmitting control information over the assigned number of downlink control channels to facilitate frequency reuse based on the overbooking, wherein the transmitted control information comprises a subset of the configured second number of symbols equal to the determined first number of symbols to facilitate the frequency reuse.

18. The apparatus of claim 17 , wherein the means for transmitting the control information over the assigned number of downlink control channels is configured to achieve an effective reuse factor less than one.

19. The apparatus of claim 18 , wherein the effective reuse factor is no more than the first number of symbols to support transmission of control information on a downlink control channel divided by the second number of symbols for transmission of control information on the downlink control channel.

20. The apparatus of claim 17 , wherein the downlink control channel is a physical downlink control channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

21. The apparatus of claim 17 , wherein the downlink control channel is at least one of a physical control format indicator channel or a physical hybrid automatic repeat request indicator channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

22. The apparatus of claim 17 , wherein the second number of symbols for transmission of control information on the downlink control channel is based, at least, on a system bandwidth of a wireless communication system including the apparatus, a subframe type of the wireless communication system including the apparatus or channel conditions in the wireless communication system including the apparatus.

23. The apparatus of claim 22 , wherein the second number of symbols for transmission of control information on the downlink control channel is three symbols if the system bandwidth of the wireless communication system including the apparatus is greater than 10 resource blocks.

24. The apparatus of claim 22 , wherein the second number of symbols for transmission of control information on the downlink control channel is up to two symbols if the subframe type of the wireless communication system including the apparatus is a multimedia broadcast over a single frequency network or a special subframe in the wireless communication system including the apparatus operating according a time division duplex protocol.

25. An apparatus, comprising:

a resource allocation module configured to:

determine a first number of symbols to support transmission of control information on a downlink control channel, wherein the first number of symbols to support transmission of control information on a downlink control channel is a minimum number for supporting transmission;

overbook the downlink control channel by configuring a second number of symbols for transmission of control information on the downlink control channel, wherein the second number of symbols for transmission of control information on the downlink control channel is greater than the first number of symbols;

a transmitter configured to transmit control information over the assigned number of downlink control channels to facilitate frequency reuse based on the overbooking, wherein the transmitted control information comprises a subset of the configured second number of symbols equal to the determined first number of symbols to facilitate the frequency reuse.

26. The apparatus of claim 25 , wherein the transmitter configured to transmit the control information over the assigned number of downlink control channels is configured to achieve an effective reuse factor less than one.

27. The apparatus of claim 26 , wherein the effective reuse factor is no more than the first number of symbols to support transmission of control information on a downlink control channel divided by the second number of symbols for transmission of control information on the downlink control channel.

28. The apparatus of claim 25 , wherein the downlink control channel is a physical downlink control channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

29. The apparatus of claim 25 , wherein the downlink control channel is at least one of a physical control format indicator channel or a physical hybrid automatic repeat request indicator channel, and wherein symbols to support transmission of control information on a downlink control channel are orthogonal frequency division multiplexing symbols.

30. The apparatus of claim 25 , wherein the second number of symbols for transmission of control information on the downlink control channel is based, at least, on a system bandwidth of a wireless communication system including the apparatus, a subframe type of the wireless communication system including the apparatus or channel conditions in the wireless communication system including the apparatus.

31. The apparatus of claim 30 , wherein the second number of symbols for transmission of control information on the downlink control channel is three symbols if the system bandwidth of the wireless communication system including the apparatus is greater than 10 resource blocks.

32. The apparatus of claim 30 , wherein the second number of symbols for transmission of control information on the downlink control channel is up to two symbols if the subframe type of the wireless communication system including the apparatus is a multimedia broadcast over a single frequency network or a special subframe in the wireless communication system including the apparatus operating according a time division duplex protocol.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 29, 2010

From: MONTOJO, JUAN; CHEN, WANSHI; DAMNJANOVIC, ALEKSANDAR

To: QUALCOMM INCORPORATED

Reel/Frame 025553/0968 →

Continuity (1)

Related Publication 20120099489A1 · Apr 26, 2012