[특허]Cell identification based on distance

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-007/20
출원번호	US-0196167 (1998-11-20)
우선권정보	SE0004281 (1997-11-21)
발명자 / 주소	Magnusson Sverker,SEX Olofsson H.ang.kan,SEX Isaksson Katarina,SEX Trzeciak Stephan,SEX
출원인 / 주소	Telefonaktiebolaget LM Ericsson (publ), SEX
대리인 / 주소	Burns, Doane, Swecker & Mathis, L.L.P.
인용정보	피인용 횟수 : 47 인용 특허 : 5

초록 ▼

The present invention relates generally to the problem of determining the identity of a cell for e.g. cell handoff or automatic frequency planning, and more particularly to the problem of determining the true identity of a cell when only the transmission frequency and a non-unique identity code is k

The present invention relates generally to the problem of determining the identity of a cell for e.g. cell handoff or automatic frequency planning, and more particularly to the problem of determining the true identity of a cell when only the transmission frequency and a non-unique identity code is known. A candidate list is created for each cell. This candidate list is created based on a function of various elements e.g. distance, transmission power, cell type, and antenna placement. The cells are then ranked on the candidate list based on this function. When a particular frequency/code combination is detected, the candidate list is then consulted, and the highest ranking cell with the same frequency/code combination is chosen as being the signal source. In an alternative embodiment the neighbor cell list is used to create the candidate list. If there are no matches on this list for the detected frequency/code combination, then the neighbors of the cells on the candidate list are also added to the candidate list which is then checked for a match.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for determining the identity of a cell from which a signal is transmitted in a cellular mobile communications system having a plurality of cells, said cells having base stations for receiving and transmitting radio signals to and from at least one mobile statio

[ What is claimed is:] [1.]1. A method for determining the identity of a cell from which a signal is transmitted in a cellular mobile communications system having a plurality of cells, said cells having base stations for receiving and transmitting radio signals to and from at least one mobile station, said mobile station being situated in a first cell, said first cell having a candidate list and a non-unique identification of a second cell, said method comprising the steps of:defining a virtual distance from said first cell to said second cell;detecting, in said first cell, a non-unique identification transmitted from a cell other than said first cell;checking said candidate list for said first cell for a matching, non-unique identification; andconcluding that the cell identity on said candidate list, for which the non-unique identification matches the non-unique identification transmitted from said other cell, and for which said virtual distance is shortest, is the identity of the cell from which the signal was transmitted. [12.]12. The method of claim 1 wherein said non-unique transmitted identification is a combination of the transmission signal frequency and a transmitted identification code.13. The method of claim 1 wherein said non-unique transmitted identification is the transmission signal frequency.14. The method of claim 1 wherein said non-unique transmitted identification is a transmitted code.15. The method of claim 1 wherein said origin of said signal is used for planning the frequencies broadcast by the cells in said system.16. The method of claim 1 wherein said origin of said signal is used for deciding which cell to handover to from said first cell.17. The method of claim 1 wherein said origin of said signal is used for automatically producing a neighbor cell list for said first cell.18. A method for determining the identity of a cell from which a signal is transmitted in a cellular mobile communications system having a plurality of cells, said cells having base stations for receiving and transmitting radio signals to and from at least one mobile station, said mobile station being situated in a first cell, said first cell having a neighbor cell list including a plurality of fields corresponding to neighbor cells of said first cell and fields for non-unique identification of a neighbor cells, said first cell also having a candidate list and a non-unique identification of said second cell, said method comprising the steps of:a first step of detecting, in said first cell, a non-unique identification transmitted from a cell other than said first cell;a second step of adding said plurality of fields for said cells in said neighbor cell list to said candidate list;a third step of checking said candidtate list for a matching non-unique identification;if there is no match then checking the neighbor cell lists for each cell on said candidate list and modifying said candidate list by repeating said second step and adding fields for each cell on each neighbor cell list for each cell on said candidate list and then repeating said third step and checking the modified candidate list for a matching non-unique identification.19. The method of claim 18 wherein if there is only one match in said third step then conclude that the match is the origin of said signal.

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[미국특허] Cell identification based on distance 원문보기

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