FREQUENCY HOPPING IN A WIRELESS COMMUNICATION NETWORK

• US 20100189032A1
• Filed: 11/19/2009
• Published: 07/29/2010
• Est. Priority Date: 01/28/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kitazoe, Masato, Ho, Saiyiu Duncan, Montojo, Juan, Chen, Wanshi, Tenny, Nathan E., Gaal, Peter
• Granted Patent: US 9,374,131 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns

Abstract

Techniques for performing frequency hopping in a wireless network are described. In an aspect, frequency hopping may be performed based on both cell identity (ID) and system time information. In one design, a user equipment (UE) may determine a cell ID of a cell and may obtain system time information for the cell. The UE may determine resources to use for transmission with frequency hopping based on the cell ID and the system time information. In one design, the UE may initialize a PN generator in each radio frame with an initial value determined based on the cell ID and a system frame number (SFN) for the radio frame. The UE may determine the resources to use for transmission based on a hopping function, a mirroring function, and a PN sequence from the PN generator. The UE may send a transmission on the resources to the cell.

Claims

1. A method for wireless communication, comprising:

determining a cell identity (ID) of a cell;

obtaining system time information for the cell; and

determining resources to use for transmission with frequency hopping based on the cell ID and the system time information.

2. The method of claim 1, further comprising:

sending a transmission on the resources from a user equipment (UE) to the cell.

3. The method of claim 1, further comprising:

receiving a transmission sent on the resources by a user equipment (UE) to the cell.

4. The method of claim 1, wherein the determining the resources to use for transmission comprises

initializing a pseudo-random number (PN) generator based on the cell ID and the system time information,

generating a PN sequence with the PN generator, and

determining the resources to use for transmission based on the PN sequence.

5. The method of claim 4, wherein the system time information comprises a system frame number (SFN), and wherein the initializing the PN generator comprises

determining an initial value for the PN generator in each radio frame based on the cell ID and the SFN for the radio frame, and

initializing the PN generator in each radio frame with the initial value for the radio frame.

6. The method of claim 5, wherein the initial value for the PN generator in each radio frame comprises L bits for the cell ID and M bits for M least significant bits (LSBs) of the SFN, where L and M are each one or greater.

7. The method of claim 1, wherein the system time information comprises a system frame number (SFN), and wherein the determining the resources to use for transmission comprises

generating a pseudo-random number (PN) sequence in each radio frame based on the cell ID and the SFN,

determining a subband to use for transmission based on a hopping function and the PN sequence, and

determining the resources to use for transmission based on the subband.

8. The method of claim 7, wherein the determining the resources to use for transmission further comprises

determining whether to use mirroring based on a mirroring function and the PN sequence, and

determining the resources to use for transmission based further on whether to use mirroring.

9. The method of claim 7, wherein the PN sequence is generated in each radio frame based on at least one bit of the SFN, and wherein the hopping function has a periodicity of at least two radio frames.

10. The method of claim 7, wherein the PN sequence is generated in each radio frame based on two least significant bits (LSBs) of the SFN, and wherein the hopping function has a periodicity of four radio frames.

11. The method of claim 1, wherein the system time information comprises a system frame number (SFN), and wherein the determining the resources to use for transmission comprises

generating a pseudo-random number (PN) sequence in each radio frame based on the cell ID,

determining an offset for each radio frame based on the SFN,

determining a subband to use for transmission based on a hopping function, the PN sequence, and the offset, and

determining the resources to use for transmission based on the subband.

12. The method of claim 11, wherein the determining the resources to use for transmission further comprises

determining whether to use mirroring based on a mirroring function, the PN sequence, and the offset, and

determining the resources to use for transmission based further on whether to use mirroring.

13. The method of claim 1, further comprising:

obtaining the system time information from a broadcast channel sent by the cell.

14. The method of claim 1, further comprising:

not transmitting with frequency hopping if the system time information is not available.

15. The method of claim 1, further comprising:

not transmitting with frequency hopping during a random access procedure.

16. The method of claim 1, further comprising:

receiving an assignment with frequency hopping; and

treating the assignment as invalid if the system time information is not available.

17. The method of claim 7, further comprising:

using a default value for the SFN or a default number of subbands for the hopping function if the SFN is not available.

18. The method of claim 2, wherein the determining the resources to use for transmission comprises

obtaining an assignment of at least one virtual resource block (VRB) from the cell, and

mapping the at least one VRB to at least one physical resource block (PRB) based on a hopping function and a pseudo-random number (PN) sequence generated based on the cell ID and the system time information, and wherein the sending a transmission on the resources comprises sending a transmission on the at least one PRB for a Physical Uplink Shared Channel (PUSCH) from the UE to the cell.

19. An apparatus for wireless communication, comprising:

means for determining a cell identity (ID) of a cell;

means for obtaining system time information for the cell;

means for determining resources to use for transmission with frequency hopping based on the cell ID and the system time information; and

means for sending a transmission on the resources from a user equipment (UE) to the cell.

20. The apparatus of claim 19, wherein the system time information comprises a system frame number (SFN), and wherein the means for determining the resources to use for transmission comprises

means for determining an initial value for a pseudo-random number (PN) generator in each radio frame based on the cell ID and the SFN for the radio frame,

means for initializing the PN generator in each radio frame with the initial value for the radio frame,

means for generating a PN sequence in each radio frame with the PN generator, and

means for determining the resources to use for transmission in each radio frame based on the PN sequence for the radio frame.

21. The apparatus of claim 19, wherein the system time information comprises a system frame number (SFN), and wherein the means for determining the resources to use for transmission comprises

means for generating a pseudo-random number (PN) sequence in each radio frame based on the cell ID and the SFN,

means for determining a subband to use for transmission based on a hopping function and the PN sequence, and

means for determining the resources to use for transmission based on the subband.

22. The apparatus of claim 21, wherein the means for determining the resources to use for transmission further comprises

means for determining whether to use mirroring based on a mirroring function and the PN sequence, and

means for determining the resources to use for transmission based further on whether to use mirroring.

23. The apparatus of claim 21, wherein the PN sequence is generated in each radio frame based on two least significant bits (LSBs) of the SFN, and wherein the hopping function has a periodicity of four radio frames.

24. The apparatus of claim 19, further comprising:

means for obtaining the system time information from a broadcast channel sent by the cell; and

means for not transmitting with frequency hopping if the system time information is not available.

25. The apparatus of claim 19, wherein the means for determining the resources to use for transmission comprises

means for obtaining an assignment of at least one virtual resource block (VRB) from the cell, and

means for mapping the at least one VRB to at least one physical resource block (PRB) based on a hopping function and a pseudo-random number (PN) sequence generated based on the cell ID and the system time information, and wherein the means for sending a transmission on the resources comprises means for sending a transmission on the at least one PRB for a Physical Uplink Shared Channel (PUSCH) from the UE to the cell.

26. An apparatus for wireless communication, comprising:

at least one processor configured to determine a cell identity (ID) of a cell, to obtain system time information for the cell, to determine resources to use for transmission with frequency hopping based on the cell ID and the system time information, and to send a transmission on the resources from a user equipment (UE) to the cell.

27. The apparatus of claim 26, wherein the system time information comprises a system frame number (SFN), and wherein the at least one processor is configured to determine an initial value for a pseudo-random number (PN) generator in each radio frame based on the cell ID and the SFN for the radio frame, to initialize the PN generator in each radio frame with the initial value for the radio frame, to generate a PN sequence in each radio frame with the PN generator, and to determine the resources to use for transmission in each radio frame based on the PN sequence for the radio frame.

28. The apparatus of claim 26, wherein the system time information comprises a system frame number (SFN), and wherein the at least one processor is configured to generate a pseudo-random number (PN) sequence in each radio frame based on the cell ID and the SFN, to determine a subband to use for transmission based on a hopping function and the PN sequence, and to determine the resources to use for transmission based on the subband.

29. The apparatus of claim 28, wherein the at least one processor is configured to determine whether to use mirroring based on a mirroring function and the PN sequence, and to determine the resources to use for transmission based further on whether to use mirroring.

30. The apparatus of claim 28, wherein the PN sequence is generated in each radio frame based on two least significant bits (LSBs) of the SFN, and wherein the hopping function has a periodicity of four radio frames.

31. The apparatus of claim 26, wherein the at least one processor is configured to obtain the system time information from a broadcast channel sent by the cell, and to not transmit with frequency hopping if the system time information is not available.

32. The apparatus of claim 26, wherein the at least one processor is configured to obtain an assignment of at least one virtual resource block (VRB) from the cell, to map the at least one VRB to at least one physical resource block (PRB) based on a hopping function and a pseudo-random number (PN) sequence generated based on the cell ID and the system time information, and to send a transmission on the at least one PRB for a Physical Uplink Shared Channel (PUSCH) from the UE to the cell.

33. A computer program product, comprising:

a computer-readable medium comprising;

code for causing at least one computer to determine a cell identity (ID) of a cell,

code for causing the at least one computer to obtain system time information for the cell,

code for causing the at least one computer to determine resources to use for transmission with frequency hopping based on the cell ID and the system time information, and

code for causing the at least one computer to send a transmission on the resources from a user equipment (UE) to the cell.