Claims
- 1. A method for uplink interference detection comprising:
determining if a cell specific trigger has occurred at a mobile device; determining if at least one co-sited cell exists; performing inter-frequency measurements and comparison of co-sited cells to determine if a soft handover area exists if the cell specific trigger has occurred and at least one co-sited cell exists; and initiating reselection from a current cell downlink carrier to a co-sited cell downlink carrier.
- 2. The method according to claim 1, wherein the cell specific trigger comprises a cell quality indicator of the current cell being higher than or lower than a desired level.
- 3. The method according to claim 2, wherein the cell quality indicator is CPICH Ec/lo.
- 4. The method according to claim 1, wherein the cell specific trigger comprises a signal strength indicator of the current cell being higher than or lower than a desired level.
- 5. The method according to claim 4, wherein the signal strength indicator is RSSI.
- 6. The method according to claim 1, wherein the cell specific trigger comprises a mobile speed indicator being higher than or lower than a desired level.
- 7. The method according to claim 1, wherein the cell specific trigger comprises a positioning indicator being higher than or lower than a desired level.
- 8. The method according to claim 1, wherein the cell specific trigger comprises a combination of at least two of a cell quality indicator of the current cell, a signal strength indicator of the current cell, a mobile speed indicator of the current cell, and a positioning indicator of the current cell being higher than or lower than a desired level.
- 9. The method according to claim 1, further comprising initiating reselection from current cell downlink carrier in an extension band to a co-sited cell downlink carrier in the extension band if a co-sited cell is found in same frequency band as the current cell downlink carrier.
- 10. The method according to claim 1, further comprising initiating reselection from current cell downlink carrier in an extension band to a co-sited cell downlink carrier in a core band.
- 11. The method according to claim 1, further comprising initiating reselection from the current cell downlink carrier in an extension band to a non co-sited cell downlink carrier in a core band.
- 12. The method according to claim 1, further comprising starting a timer after the cell specific trigger has occurred and initiating cell reselection to a best found core band cell if the timer expires before a co-sited cell has been identified.
- 13. The method according to claim 12, wherein the best found core band cell is determined by performing inter-frequency measurements and comparison of core band cells.
- 14. The method according to claim 1, further comprising setting the cell specific trigger at the mobile device by a network node.
- 15. The method according to claim 1, further comprising performing inter-frequency measurements and comparison of co-sited cells while the mobile device is in an idle mode using idle mode measurement periods.
- 16. The method according to claim 1, further comprising performing inter-frequency measurements and comparison of co-sited cells while the mobile device is in one of a Cell_PCH state and a URA_PCH state.
- 17. The method according to claim 1, wherein the soft handover area comprises a soft handover area in an area of the co-sited downlink carrier area but not in an area of the downlink carrier.
- 18. A method for uplink interference detection comprising:
determining a trigger criteria threshold for a mobile device, the mobile device using a downlink carrier; determining if a trigger criteria has risen above or fallen below the trigger criteria threshold; performing inter-frequency measurements at co-sited cells and comparing the measurements to determined if a soft handover area exists; searching co-sited cells for downlink carriers useable by the mobile device; initiating reselection from the downlink carrier to a co-sited cell downlink carrier if a co-sited cell downlink carrier useable by the mobile device is found; and initiating reselection from the downlink carrier to a non co-sited cell downlink carrier if no co-sited cell downlink carrier useable by the mobile device is found, wherein the reselection is initiated so as to avoid uplink carrier interference.
- 19. The method according to claim 18, further comprising determining cells excluded from reselection and initiating reselection only to downlink carriers from non-excluded cells.
- 20. The method according to claim 18, wherein the trigger criteria comprises a cell quality indicator.
- 21. The method according to claim 20, wherein the cell quality indicator is CPICH Ec/lo.
- 22. The method according to claim 18 wherein the trigger criteria comprises a signal strength indicator.
- 23. The method according to claim 22, wherein the signal strength indicator is RSSI.
- 24. The method according to claim 18, wherein the trigger criteria comprises a mobile speed indicator.
- 25. The method according to claim 18, wherein the trigger criteria comprises a positioning indicator.
- 26. The method according to claim 18, wherein the trigger criteria comprises a combination of at least two of a cell quality indicator, a signal strength indicator, a mobile speed indicator, and a positioning indicator.
- 27. The method according to claim 18, further comprising initiating reselection from the downlink carrier in an extension band to a co-sited cell downlink carrier in the extension band.
- 28. The method according to claim 18, further comprising initiating reselection from the downlink carrier in an extension band to a co-sited cell downlink carrier in a core band.
- 29. The method according to claim 18, further comprising initiating reselection from the downlink carrier in an extension band to a non co-sited cell downlink carrier in a core band.
- 30. The method according to claim 18, further comprising starting a timer after the trigger criteria has risen above or fallen below the trigger criteria threshold and initiating cell reselection to a best found core band cell if the timer expires before a co-sited cell has been found.
- 31. The method according to claim 30, wherein the best found core band cell is determined by performing inter-frequency measurements and comparison of core band cells.
- 32. The method according to claim 18, further comprising setting the trigger criteria threshold at the mobile device by a network node.
- 33. The method according to claim 18, further comprising performing the inter-frequency measurements of the trigger criteria at co-sited cells and comparing to determined if a soft handover area exists while the mobile device is in an idle mode using idle mode measurement periods.
- 34. The method according to claim 18, further comprising performing the inter-frequency measurements of the trigger criteria at co-sited cells and comparing to determined if a soft handover area exists while the mobile device is in one of a Cell_PCH state and a URA_PCH state.
- 35. The method according to claim 18, wherein the soft handover area comprises a soft handover area in an area of the co-sited downlink carrier area but not in an area of the downlink carrier.
- 36. A system for soft handover detection for uplink interference avoidance comprising:
at least two network devices in a communications network; and a mobile device, the mobile device operatively connected to the communications network and using a downlink carrier, wherein if a cell specific trigger has occurred at the mobile device inter-frequency measurements and comparison of co-sited cells are performed to determine if a soft handover area exists, reselection is initiated from a current cell downlink carrier to a co-sited cell downlink carrier if a co-sited cell is found and from the current cell downlink carrier to a non co-sited cell downlink carrier if no co-sited cell is found, the system providing for reselection while uplink carrier interference is avoided.
- 37. The system according to claim 36, wherein the network device comprises one of a radio network controller (RNC) and base station controller (BSC).
- 38. The system according to claim 36, wherein the cell specific trigger occurs if an indicator rises above or falls below a desired level.
- 39. The system according to claim 38, wherein the indicator comprises a cell quality indicator.
- 40. The system according to claim 39, wherein the cell quality indicator comprises CPICH Ec/lo.
- 41. The system according to claim 38, wherein the indicator comprises a signal strength indicator.
- 43. The system according to claim 41, wherein the signal strength indicator comprises RSSI.
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Patent Application serial No. 60/375,809 filed Apr. 29, 2002, the contents of which is expressly incorporated by reference herein.
Provisional Applications (1)
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Number |
Date |
Country |
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60375809 |
Apr 2002 |
US |