ADAPTIVE RADIO FREQUENCY INTERFERENCE MITIGATION DURING CHANNEL SCANNING OR HOPPING

US 20090080498A1
Filed: 09/24/2007
Published: 03/26/2009
Est. Priority Date: 09/24/2007
Status: Active Grant

First Claim

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1. An apparatus comprising:

an adaptive clock controller to determine clock interference associated with a channel changing pattern for a radio in a computing platform, and to determine an earliest switching time of a clock of the computing platform; and

a clock generator to change a frequency of the clock in response to the determined clock interference and in response to the earliest switching time.

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Abstract

In some embodiments an adaptive clock controller is to determine clock interference associated with a channel changing pattern for a radio in a computing platform, and to determine an earliest switching time of a clock of the computing platform. A clock generator is to change a frequency of the clock in response to the determined clock interference and in response to the earliest switching time. Other embodiments are described and claimed.

Citations

39 Claims

1. An apparatus comprising:
- an adaptive clock controller to determine clock interference associated with a channel changing pattern for a radio in a computing platform, and to determine an earliest switching time of a clock of the computing platform; and
  
  a clock generator to change a frequency of the clock in response to the determined clock interference and in response to the earliest switching time.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- - 2. The apparatus of claim 1, wherein the channel changing pattern is a channel scanning pattern.
  - 3. The apparatus of claim 1, wherein the channel changing pattern is a channel hopping pattern.
  - 4. The apparatus of claim 1, the adaptive clock controller further to identify the channel changing pattern.
  - 5. The apparatus of claim 1, further comprising a radio to provide a channel pattern and a current position in the pattern to the adaptive clock controller.
  - 6. The apparatus of claim 1, further comprising a radio to provide a channel change notification to the adaptive clock controller.
  - 7. The apparatus of claim 1, wherein the adaptive clock controller is to determine clock interference by generating an interference cost pattern.
  - 8. The apparatus of claim 7, wherein the adaptive clock controller is to generate the interference cost pattern by choosing from among a set of frequencies to achieve a lowest interference.
  - 9. The apparatus of claim 7, wherein the adaptive clock controller is to generate the interference cost pattern by generating one pattern per clock frequency for the clock.
  - 10. The apparatus of claim 7, wherein the adaptive clock controller is to generate the interference cost pattern such that the cost pattern of the p^thclock frequency is:
    - C₁^p, C₂^p, . . . , C_T^pwherein the interference cost at time slot t is;
      
      C_t=C(ω
      
      ₀,ω
      
      _c,1(t),ω
      
      _bw,1(t),ω
      
      _c,2(t),ω
      
      _bw,2(t), . . . ω
      
      _c,M(t),ω
      
      _bw,M(t),)where C(·
      
      ) is defined as;
      
      $C (ω_{0}, ω_{c, 1}, ω_{bw, 1}, \dots, ω_{c, M}, ω_{bw, M}) = \int [\sum_{n = 1}^{N_{p}} A_{n} δ (n ω_{0} - ω)] [\sum_{m = 1}^{M} P_{m} (\frac{ω_{c, m} - ω}{ω_{bw, m}})] \partial ω$ and wherein;
      
      A_nis the amplitude of the n^thharmonicω
      
      _pis the fundamental frequency of the clockP_m(x) is the interference penalty function for the m^thradioω
      
      _c,mis the center frequency of active channel of the m^thradioω
      
      _bw,mis the bandwidth of the active channel of the m^thradio.
  - 11. The apparatus of claim 1, wherein the adaptive clock controller is to determine the earliest switching time as follows:
    - If C_t^p=C_t^qfor all q, where p is the index of the current clock frequency, then for time slots t+1, t+2, . . . , . . . T, determine the first time slot slot t_cfor which C_t_c^p≠
      
      C_t_c^qfor some q; and
      
      If C_t_c^p>
      
      C_t_c^qthen switch slot t_c−
      
      t slots in advance.

12. A method comprising:
- determining clock interference associated with a channel changing pattern for a radio in a computing platform;
  
  determining an earliest switching time of a clock of the computing platform; and
  
  changing a frequency of the clock in response to the determined clock interference and in response to the earliest switching time.
- View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- - 13. The method of claim 12, wherein the channel changing pattern is a channel scanning pattern.
  - 14. The method of claim 12, wherein the channel changing pattern is a channel hopping pattern.
  - 15. The method of claim 12, further comprising identifying the channel changing pattern.
  - 16. The method of claim 15, wherein the identifying includes receiving a channel pattern and a current position in the pattern from the radio.
  - 17. The method of claim 15, wherein the identifying includes receiving a channel change notification from the radio.
  - 18. The method of claim 12, wherein the determining includes choosing from among a set of frequencies to achieve a lowest interference.
  - 19. The method of claim 12, wherein the determining includes generating one pattern per clock frequency for the clock.
  - 20. The method of claim 12, wherein the determining includes generating an interference cost pattern.
  - 21. The method of claim 20, wherein the interference cost pattern is generated such that the cost pattern of the p^thclock frequency is:
    - C₁^p, C₂^p, . . . , C_T^pwherein the interference cost at time slot t is;
      
      C_t=C(ω
      
      ₀,ω
      
      _c,1(t),ω
      
      _bw,1(t),ω
      
      _c,2(t),ω
      
      _bw,2(t), . . . ω
      
      _c,M(t),ω
      
      _bw,M(t),)where C(·
      
      ) is defined as;
      
      $C (ω_{0}, ω_{c, 1}, ω_{bw, 1}, \dots, ω_{c, M}, ω_{bw, M}) = \int [\sum_{n = 1}^{N_{p}} A_{n} δ (n ω_{0} - ω)] [\sum_{m = 1}^{M} P_{m} (\frac{ω_{c, m} - ω}{ω_{bw, m}})] \partial ω$ and wherein;
      
      A_nis the amplitude of the n^thharmonicω
      
      _pis the fundamental frequency of the clockP_m(x) is the interference penalty function for the m^thradioω
      
      _c,mis the center frequency of active channel of the m^thradioω
      
      _bw,mis the bandwidth of the active channel of the m^thradio.
  - 22. The method of claim 12, wherein the determining includes:
    - If C_t^p=C_t^qfor all q, where p is the index of the current clock frequency, then for time slots t+1, t+2, . . . , . . . T, determine the first time slot slot t_cfor which C_t_c^p≠
      
      C_t_c^qfor some q; and
      
      If C_t_c^p>
      
      C_t_c^qthen switch slot t_c−
      
      t slots in advance.

23. A computing platform comprising:
- a clock;
  
  an adaptive clock controller to determine clock interference associated with a channel changing pattern for a radio in a computing platform, and to determine an earliest switching time of the clock; and
  
  a clock generator to change a frequency of the clock in response to the determined clock interference and in response to the earliest switching time.
- View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 39)
- - 24. The computing platform of claim 23, wherein the channel changing pattern is a channel scanning pattern.
  - 25. The computing platform of claim 23, wherein the channel changing pattern is a channel hopping pattern.
  - 26. The computing platform of claim 23, the adaptive clock controller further to identify the channel changing pattern.
  - 27. The computing platform of claim 23, further comprising a radio to provide a channel pattern and a current position in the pattern to the adaptive clock controller.
  - 28. The computing platform of claim 23, further comprising a radio to provide a channel change notification to the adaptive clock controller.
  - 29. The computing platform of claim 23, wherein the adaptive clock controller is to determine the clock interference by generating an interference cost pattern.
  - 30. The computing platform of claim 29, wherein the adaptive clock controller is to generate the interference cost pattern by choosing from among a set of frequencies to achieve a lowest interference.
  - 31. The computing platform of claim 29, wherein the adaptive clock controller is to generate the interference cost pattern by generating one pattern per clock frequency for the clock.
  - 32. The computing platform of claim 29, wherein the adaptive clock controller is to generate the interference cost pattern such that the cost pattern of the p^thclock frequency is:
    - C₁^p, C₂^p, . . . , C_T^pwherein the interference cost at time slot t is;
      
      C_t=C(ω
      
      ₀,ω
      
      _c,1(t),ω
      
      _bw,1(t),ω
      
      _c,2(t),ω
      
      _bw,2(t), . . . ω
      
      _c,M(t),ω
      
      _bw,M(t),)where C(·
      
      ) is defined as;
      
      $C (ω_{0}, ω_{c, 1}, ω_{bw, 1}, \dots, ω_{c, M}, ω_{bw, M}) = \int [\sum_{n = 1}^{N_{p}} A_{n} δ (n ω_{0} - ω)] [\sum_{m = 1}^{M} P_{m} (\frac{ω_{c, m} - ω}{ω_{bw, m}})] \partial ω$ and wherein;
      
      A_nis the amplitude of the n^thharmonicω
      
      _pis the fundamental frequency of the clockP_m(x) is the interference penalty function for the m^thradioω
      
      _c,mis the center frequency of active channel of the m^thradioω
      
      _bw,mis the bandwidth of the active channel of the m^thradio.
  - 33. The computing platform of claim 23, wherein the adaptive clock controller is to determine the earliest switching time as follows:
    - If C_t^p=C_t^qfor all q, where p is the index of the current clock frequency, then for time slots t+1, t+2, . . . , . . . T, determine the first time slot slot t_cfor which C_t_c^p≠
      
      C_t_c^qfor some q; and
      
      If C_t_c^p>
      
      C_t_c^qthen switch slot t_c−
      
      t slots in advance.
  - 39. The article of claim 33, wherein the instructions when executed further cause the computer to determine the earliest switching time by:
    - If C_t^p=C_t^qfor all q, where p is the index of the current clock frequency, then for time slots t+1, t+2, . . . , . . . T, determine the first time slot slot t_cfor which C_t_c^p≠
      
      C_t_c^qfor some q; and
      
      If C_t_c^p>
      
      C_t_c^qthen switch slot t_c−
      
      t slots in advance.

34. An article comprising:
- a computer readable medium having instructions thereon which when executed cause a computer to;
  
  determine clock interference associated with a channel changing pattern for a radio in a computing platform;
  
  determine an earliest switching time of a clock of the computing platform; and
  
  change a frequency of the clock in response to the determined clock interference and in response to the earliest switching time.
- View Dependent Claims (35, 36, 37, 38)
- - 35. The article of claim 34, wherein the instructions when executed further cause the computer to generate an interference cost pattern to determine the clock interference.
  - 36. The article of claim 35, wherein the instructions when executed further cause the computer to choose from among a set of frequencies to achieve a lowest interference to generate the interference cost pattern.
  - 37. The article of claim 35, wherein the instructions when executed further cause the computer to generate one pattern per clock frequency for the clock to generate the interference cost pattern.
  - 38. The article of claim 35, wherein the interference cost pattern is generated such that the cost pattern of the p^thclock frequency is:
    - C₁^p, C₂^p, . . . , C_T^pwherein the interference cost at time slot t is;
      
      C_t=C(ω
      
      ₀,ω
      
      _c,1(t),ω
      
      _bw,1(t),ω
      
      _c,2(t),ω
      
      _bw,2(t), . . . ω
      
      _c,M(t),ω
      
      _bw,M(t),)where C(·
      
      ) is defined as;
      
      $C (ω_{0}, ω_{c, 1}, ω_{bw, 1}, \dots, ω_{c, M}, ω_{bw, M}) = \int [\sum_{n = 1}^{N_{p}} A_{n} δ (n ω_{0} - ω)] [\sum_{m = 1}^{M} P_{m} (\frac{ω_{c, m} - ω}{ω_{bw, m}})] \partial ω$ and wherein;
      
      A_nis the amplitude of the n^thharmonicω
      
      _pthe fundamental frequency of the clockP_m(x) is the interference penalty function for the m^thradioω
      
      _c,mis the center frequency of active channel of the m^thradioω
      
      _bw,mis the bandwidth of the active channel of the m^thradio.

Specification

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Current Assignee
Intel Corporation
Original Assignee
Intel Corporation
Inventors
Zhou, Haicheng, Deisher, Michael E.

Granted Patent

US 8,625,655 B2
Time in Patent Office

Days
Field of Search
US Class Current

375/136
CPC Class Codes

H04B 1/715   Interference-related aspects

H04B 15/04   the interference being caus...

H04B 2001/7154   with means for preventing i...

H04B 2215/065   by changing the frequency o...

ADAPTIVE RADIO FREQUENCY INTERFERENCE MITIGATION DURING CHANNEL SCANNING OR HOPPING

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ADAPTIVE RADIO FREQUENCY INTERFERENCE MITIGATION DURING CHANNEL SCANNING OR HOPPING

First Claim

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Abstract

Citations

39 Claims

Specification

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