IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0529559
(2002-10-23)
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등록번호 |
US-7526289
(2009-07-01)
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국제출원번호 |
PCT/FI02/000824
(2002-10-23)
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§371/§102 date |
20050329
(20050329)
|
국제공개번호 |
WO04/040935
(2004-05-13)
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발명자
/ 주소 |
- Schwarz, Uwe
- Hakalin, Petteri
- Tölli, Antti
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출원인 / 주소 |
|
대리인 / 주소 |
Squire, Sanders & Dempsey, LLP
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인용정보 |
피인용 횟수 :
12 인용 특허 :
5 |
초록
▼
The invention relates to a radio resource control method, a mobile communications system and a network element implementing the method. According to the invention, the cell change procedures performed by the user equipment in an idle state are controlled dynamically with control information that is
The invention relates to a radio resource control method, a mobile communications system and a network element implementing the method. According to the invention, the cell change procedures performed by the user equipment in an idle state are controlled dynamically with control information that is adjusted according to a predetermined time pattern. The invention enables for instance an advanced cell change in an idle state, thus reducing the probability of a handover while the user equipment is in a dedicated connection to the network.
대표청구항
▼
The invention claimed is: 1. A method, comprising: camping, in an idle state, on a serving cell formed by a serving base station; adjusting, in a network element of a mobile communication system, at least one element of control information according to a predetermined time pattern comprising time e
The invention claimed is: 1. A method, comprising: camping, in an idle state, on a serving cell formed by a serving base station; adjusting, in a network element of a mobile communication system, at least one element of control information according to a predetermined time pattern comprising time elements having a characteristic profile in terms of a state of the mobile communication system, to form adjusted control information, wherein the control information controls cell change procedures of a user equipment camping in the idle state on the serving cell; receiving, in the user equipment, the adjusted control information for controlling cell change procedures of the user equipment, said cell change being conducted from the serving cell to a target cell; and performing, in the user equipment, the cell change procedures based on the received control information; and controlling the cell change procedures based on said adjusted control information, wherein at least one neighbor cell is formed by a neighbor base station, and the user equipment is configured to receive signals from said serving base station and said neighbor base stations. 2. A system, comprising: a network part configured to provide the fixed infrastructure of the mobile communication system, the network part comprising a serving base station configured to form a serving cell, and a neighbour base station configured to form a neighbour cell; a user equipment comprising a receiver configured to receive signals from the serving base station and from the neighbour base station; the network part further comprises a controller configured to control cell change procedures with control information, said cell change being conducted from the serving cell to a target cell, the user equipment further comprising a cell changer configured to perform cell change procedures based on control information received from the network part, wherein the receiver and the cell changer are configured to camp on the serving cell in an idle state, and wherein the network part further comprises an adjuster configured to adjust at least one element of said control information according to a predetermined time pattern comprising time elements having a characteristic profile in terms of a state of the mobile communication system, to form adjusted control information. 3. The system of claim 2, wherein the cell changer is configured to select the target cell based on the adjusted control information, and wherein the receiver and the cell changer are configured to camp on the target cell. 4. The system of claim 2, wherein the receiver and the cell changer are configured to measure a quality of the serving cell based on the adjusted control information, wherein the receiver and the cell changer are configured to measure a quality of at least one neighbour cell based on the adjusted control information, wherein the cell changer is configured to rank the measured cells based on the measured quality of the serving cell, the measured quality of the neighbour cell, and the adjusted control information, and wherein the changer is configured to select the target cell based on the ranking. 5. The mobile communication system of claim 2, wherein the network part comprises separate base station controllers for the serving base station and neighbour base station. 6. A network element of a mobile communication system, comprising a serving base station configured to form a serving cell, a neighbour base station configured to form a neighbour cell, and a user equipment camped on the serving cell in an idle state and comprising a receiver configured to receive signals from the serving base station and from the neighbor base station, the user equipment further comprising a cell changer configured to perform cell change procedures based on control information, and a controller configured to control cell change procedures with control information, said cell change being conducted from the serving cell to a target cell, the network element comprising: an adjuster configured to adjust at least one element of said control information according to a predetermined time pattern comprising time elements having a characteristic profile in terms of a state of the mobile communication system, to form adjusted control information. 7. A method, comprising: providing, in a network element of a mobile communication system, control information controlling cell change procedures of a user equipment camping in an idle state on a serving cell formed by a base station; adjusting at least one element of said control information according to a predetermined time pattern comprising time elements having a characteristic profile in terms of a state of the mobile communication system, to form adjusted control information; transmitting the adjusted control information to the user equipment; and controlling the cell change procedures based on the adjusted control information. 8. The method of claim 7, further comprising: performing, in the user equipment. the cell change procedures based on the received control information; and adjusting at least one element of the idle state control information. 9. The method of claim 7, wherein performing the cell change procedures comprises: selecting the target cell based on the adjusted control information; and camping on the target cell. 10. The method of claim 7, wherein performing the cell change procedures comprises: measuring the quality of the serving cell; measuring the quality of at least one neighbour cell; ranking the measured cells based on the measured quality of the serving cell and the measured quality of the neighbour cell; and selecting the target cell based on the ranking. 11. The method of claim 7, further comprising: adjusting at least one quality threshold of the serving cell, and wherein performing the cell change procedures comprises: measuring the quality of the serving cell, triggering measurements on the neighbour cell based on the measured quality of the serving cell and the quality threshold of the serving cell, and selecting the target cell based on the triggered measurements. 12. The method of claim 7, further comprising: camping on the serving cell that uses a different carrier frequency from that used by the neighbour cell; and adjusting at least one inter-frequency measurement threshold, and wherein performing the cell change procedures comprises: measuring the quality of the serving cell, triggering inter-frequency measurements on the neighbour cell based on the measured quality of the serving cell and the inter-frequency measurement threshold, and selecting the target cell based on the inter-frequency measurement. 13. The method of claim 7, further comprising: camping on the serving cell that uses a different radio-access technology from that used by the neighbour cell; adjusting an inter-radio access technology measurement threshold, and wherein performing the cell change procedures comprises: measuring the quality of the serving cell, triggering inter-radio access technology measurements on the neighbour cell based on the measured quality of the serving cell and the inter-radio access technology measurement threshold; and selecting the target cell based on the inter-radio access technology measurement. 14. The method of claim 7, further comprising: adjusting at least one quality threshold of the neighbour cell, and wherein the performing, in the user equipment, of the cell change procedures comprises, measuring the quality of the serving cell, triggering measurements on the neighbour cell based on the measured quality of the serving cell, measuring the quality of the neighbour cell, forming the candidate cell selection based on the measured quality of the neighbour cell and the quality threshold of the neighbour cell, and selecting the target cell based on the candidate cell selection. 15. The method of claim 7, further comprising: adjusting at least one quality offset of the serving cell, and wherein the performing, in the user equipment, of the cell change procedures comprises: measuring the quality of the serving cell, applying the quality offset of the serving cell to the measured quality of the serving cell, thus obtaining an offset-applied quality of the serving cell, measuring the quality of at least one neighbour cell, and selecting the target cell based on the measured quality of the neighbour cell, and the offset-applied quality of the serving cell. 16. The method of claim 7, further comprising: adjusting at least one quality offset of the neighbour cell, and wherein the performing, in the user equipment, of the cell change procedures comprises: measuring the quality of the serving cell, measuring the quality of at least one neighbour cell, applying the quality offset of the neighbour cell to the measured quality of the neighbour cell, thus obtaining an offset-applied quality of the neighbour cell, and selecting the target cell based on the measured quality of the serving cell and the offset-applied quality of the neighbour cell. 17. The method of claim 7, further comprising: adjusting at least one temporary quality offset of the neighbour cell and a penalty time of the neighbour cell, and wherein the performing, in the user equipment, of the cell change procedures comprises: measuring the quality of the serving cell, measuring quality of at least one neighbour cell, applying the quality offset of the neighbour cell to the measured quality of the neighbour cell for the duration of the penalty time, thus obtaining a temporary offset-applied quality of the neighbour cell, and selecting the target cell based on the measured quality of the serving cell and the temporary offset-applied quality of the neighbour cell. 18. The method of claim 7, further comprising: adjusting at least one element of the control information to assumed capacity requirements of the mobile communication system. 19. The method of claim 7, further comprising: adjusting at least one element of the control information based on assumed cell load of the serving cell. 20. The method of claim 7, further comprising: camping, on the serving cell belonging to the same hierarchical cell structure as the neighbour cell; adjusting prioritising information of hierarchical cell structure; re-prioritising the cells in a hierarchical cell structure using the adjusted prioritising information; and performing the cell change procedures based on the re-prioritising information. 21. The method of claim 7, further comprising: camping in one of the idle states specified in third generation partnership project specifications, including idle mode, a cell forward access channel state, a user registration area paging channel state, a cell paging channel state. 22. The method of claim 7, further comprising: camping on the serving cell controlled by a base station controller different from the base station controller controlling the neighbour cell. 23. An apparatus, comprising: a controller configured to provide control information controlling cell change procedures of a user equipment camping in an idle state on a serving cell formed by a base station; and an adjuster configured to adjust at least one element of said control information according to a predetermined time pattern comprising time elements having a characteristic profile in terms of a state of the mobile communication system, to form adjusted control information, wherein the controller is further configured to transmit the adjusted control information to the user equipment and control the cell change procedures based on the adjusted control information. 24. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one element of the idle state control information. 25. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one quality threshold of the serving cell. 26. The system of claim 23, wherein the adjuster is configured to adjust at least one inter-frequency measurement threshold. 27. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one inter-radio access technology measurement threshold. 28. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one quality threshold of the neighbour cell. 29. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one quality offset of the serving cell. 30. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one quality offset of the neighbour cell. 31. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one temporary quality offset of the cell and a penalty time of the neighbour cell. 32. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one element of the control information to assumed capacity requirements of the mobile communication system. 33. The apparatus of claim 23, wherein the adjuster is configured to adjust at least one element of the control information based on an assumed cell load in the serving cell. 34. The system of claim 23, wherein the base station and a neighbour base station are configured to form a hierarchical cell structure such that the serving cell and a neighbour cell belong to the same hierarchical cell structure, wherein the adjuster is configured to adjust prioritising information, and wherein the controller is configured to re-prioritise the serving cell and the neighbour cell based on the adjusted prioritising information. 35. An apparatus, comprising: providing means for providing control information controlling cell change procedures of a user equipment camping in an idle state on a serving cell formed by a base station; adjusting means for adjusting at least one element of said control information according to a predetermined time pattern comprising time elements having a characteristic profile in terms of a state of the mobile communication system, to form adjusted control information; transmitting means for transmitting the adjusted control information to the user equipment; and controlling means for controlling the cell change procedures based on the adjusted control information. 36. The apparatus according to claim 35, wherein the adjusting means adjusts at least one element of the idle state control information. 37. The apparatus according to claim 35, wherein the adjusting means adjusts at least one quality threshold of the serving cell. 38. A computer-readable program distribution medium encoding a computer program of instructions being configured to control a processor to perform: providing, in a network element of a mobile communication system, control information controlling cell change procedures of a user equipment camping in an idle state on a serving cell formed by a base station; adjusting at least one element of said control information according to a predetermined time pattern comprising time elements having a characteristic profile in terms of a state of the mobile communication system, to form adjusted control information; transmitting the adjusted control information to the user equipment; and controlling the cell change procedures based on the adjusted control information. 39. The apparatus according to claim 38, further comprising: adjusting at least one element of the idle state control information. 40. The apparatus according to claim 38, further comprising: adjusting at least one quality threshold of the serving cell. 41. The apparatus according to claim 23, further comprising: a receiver and a cell changer configured to measure a quality of the serving cell. 42. The apparatus according to claim 41, wherein the cell charger is configured to select a target cell based on a triggered measurements.
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