Method and system for making handoff between CDMA mobile communication system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-007/216
H04B-007/204
H04Q-007/00
출원번호
US-0964537
(2001-09-28)
등록번호
US-7307969
(2007-12-11)
우선권정보
KR-10-2000-64302(2000-10-31)
발명자
/ 주소
Shin,Yeong Jong
출원인 / 주소
LG Electronics, Inc.
대리인 / 주소
Ked & Associates, LLP
인용정보
피인용 횟수 :
3인용 특허 :
9
초록▼
A method and system for performing a handoff between different CDMA systems in a mobile communication network having first and second cells and a gateway cell is disclosed. The handoff between the first and second cells is performed using a gateway, wherein one frequency is used by the first cell an
A method and system for performing a handoff between different CDMA systems in a mobile communication network having first and second cells and a gateway cell is disclosed. The handoff between the first and second cells is performed using a gateway, wherein one frequency is used by the first cell and a first sector of the gateway, and a second frequency is used by the second cell and a second sector of the gateway. The system and method allow for performing a handoff of a call between two different communication systems having two different communication standards, such as between a CDMA 2G system and a CDMA 3G system, and further allows for the handoff to be performed without dropping the call.
대표청구항▼
What is claimed is: 1. A method for performing a handoff between different mobile communication networks, comprising: performing a first handoff from a cell region of a first base station of a first communication network to a first sector of a gateway base station when a pilot signal strength from
What is claimed is: 1. A method for performing a handoff between different mobile communication networks, comprising: performing a first handoff from a cell region of a first base station of a first communication network to a first sector of a gateway base station when a pilot signal strength from the gateway base station exceeds a threshold value, the first handoff being performed while maintaining a frequency of the first base station; performing an inter-sector hard handoff from the first sector of the gateway base station to a second sector of the gateway base station when a pilot signal strength of the first base station meets a drop threshold value, the hard handoff changing the frequency of the first base station to a frequency of a second base station different from the frequency of the first base station; and performing a second handoff from the second sector of the gateway base station to a cell region of the second base station of a second communication network when a pilot signal strength of the second base station exceeds a threshold value, the second handoff being performed while maintaining the frequency of the second base station, wherein each of the first and second sectors of the gateway base station comprise an overlap area of the first and second base stations. 2. The method of claim 1, wherein the first and second handoffs are one of a soft handoff or a softer handoff. 3. The method of claim 1, wherein the first sector of the gateway base station operates at the frequency of the first base station and wherein the second sector of the gateway base station operates at the frequency of the second base station. 4. The method of claim 1, wherein the gateway base station comprises a gateway control station that is communicatively coupled to a first control station of the first communication network and a second control station of the second communication network. 5. The method of claim 1, wherein a communication standard of the first communication network is different than a communication standard of the second network. 6. The method of claim 5, wherein the communication standard of the first communication network is CDMA 2G, and wherein the communication standard of the second communication network is CDMA 3G. 7. The method of claim 1, wherein performing the first handoff comprises: performing an ADD handoff to receive a signal from the first sector of the gateway base station along with a signal from the first base station if the strength of the signal of the first sector exceeds the threshold value; and performing a drop handoff to release the signal from the first base station if the strength of the signal of the first base station falls below the drop threshold value. 8. The method of claim 1, wherein performing the inter-sector hard handoff comprises switching from the first sector of the gateway base station to the second sector of the gateway base station, and changing a frequency of the first sector equal to the frequency of the first base station to a frequency of the second sector equal to the frequency of the second base station after performing the first handoff. 9. The method of claim 1, wherein performing the second handoff comprises: performing an ADD handoff to receive a signal from the second sector of the gateway base station along with a signal from the second base station if the strength of the signal of the second base station exceeds the threshold value; and performing a drop handoff to release the signal from the second sector if the strength of the signal of the second sector falls below the drop threshold value. 10. The method of claim 1, wherein the first and second sectors of the gateway base station overlap one another. 11. The method of claim 1, wherein the cell regions of the first and second base stations overlap one another. 12. A method for making handoff in a mobile communication network having a cell 'A', a cell 'B', and a cell 'G' coupled between cell 'A' and cell 'B', comprising: performing a first handoff from cell 'A' to an α sector of cell 'G' if a strength of a signal from cell 'G' is higher than a threshold value; performing an inter-sector hard handoff from the α sector of cell 'G' to the β sector of cell 'G' if a signal of cell 'A' meets a drop threshold value; and performing a second handoff from the β sector of cell 'G' to cell 'B' if a strength of a signal of cell 'B' is higher than a threshold value wherein cell 'A' and the α sector of cell 'G' use a first frequency and signal strengths overlapped with each other and cell 'B' and the β sector of cell 'G' use a second frequency and signal strengths overlapped with each other, wherein a first base station controls cell A and a second base station controls cell B and wherein each of the α and β sectors comprise an overlap area of the first and second base stations. 13. The method of claim 12, wherein performing the first handoff comprises: making an ADD handoff in which the α sector of cell 'G' is added to cell 'A' if the strength of the signal of the α sector of cell 'G' is higher than the threshold value; and making a drop handoff in which cell 'A' is dropped if the strength of the signal of cell 'A' drops below the drop threshold value. 14. The method of claim 12, wherein performing the inter-sector hard handoff comprises switching from the α sector of cell 'G' to the β sector of cell 'G' and changing from the first frequency to the second frequency upon performing the inter-sector hard handoff. 15. The method of claim 12, wherein performing the second handoff comprises: making an ADD handoff in which the β sector of cell 'G' is added to cell 'B' if the strength of the signal of cell 'B' is higher than the threshold value; and making a drop handoff in which the β of cell 'G' is dropped if the strength of the signal of the β sector of cell 'G' drops below the drop threshold value. 16. The method of claim 12, wherein a communication standard of cell 'A' is different than a communication standard of cell 'B.' 17. The method of claim 16, wherein the communication standard of the first communication network is CDMA 2G, and wherein the communication standard of the second communication network is CDMA 3G. 18. The method of claim 12, wherein the β sector of cell 'G' overlaps the α sector of cell 'G' overlap. 19. The method of claim 12, wherein the cells 'A' and 'B' overlap one another. 20. A system for performing a handoff between CDMA mobile communication systems, comprising: a first mobile communication system having a first communication standard; a second mobile communication system different from the first mobile communication system having a second communication standard; and a gateway station in an overlap region of the first and second communication system having a first sector inclusive of a frequency group of the first mobile communication system and a second sector inclusive of a frequency group of the second mobile communication system, the gateway station to control and manage a hard handoff from a first frquency of the first mobile communication system to a second frequency of the second mobile communication system, wherein at least one cell of the first communication system and at least one cell of the second communication system overlap one another in said overlap region at an area where the first and second sectors overlap. 21. The system of claim 20, wherein the gateway station comprises: a gateway base station to communicate with base stations of the first mobile communication system and the second mobile communication system, and a gateway control station having functions and characteristics of the first mobile communication system and the second mobile communication system for controlling the gateway base station. 22. The system of claim 20, wherein the communication standard of the first mobile communication system is CDMA 2G, and wherein the communication standard of the second mobile communication system is CDMA 3G. 23. The system of claim 20, wherein the first and second sectors overlap one another. 24. A gateway for performing a handoff between a first communication system using a first communication standard and a second communication system using a second communication standard, comprising: a gateway base station located in an overlap region between base stations of the first and second communication systems and having first and second sectors of coverage using first and second frequencies, respectively, and the gateway base station to communicate with a mobile terminal; and a gateway control station communicatively coupled with each of the first and second communication networks and the gateway control station to control the gateway base station, wherein a first communication network performs first soft handoff of a call to the first sector of the gateway base station using the first frequency, the gateway base station performs an inter-frequency hard handoff of the call between the first and second sectors of the gateway base station from the first frequency to the second frequency, and wherein the gateway base station performs a second soft handoff of the call to the second communication network using the second frequency, wherein the gateway base station prevents a ping-pong effect during the handoff of the call from the first communication network to the second communication network. 25. The gateway of claim 24, wherein the frequency used by the first sector is a frequency used by the first communication system, and wherein the frequency used by the second sector is a frequency used by the second communication system. 26. The gateway of claim 25, wherein the gateway base station acquires a mobile terminal communicating on the first communication network using the first frequency by the first soft handoff, performs the inter-frequency hard handoff from the first sector using the first frequency to the second sector using the second frequency, and passes the mobile terminal to the second communication network using the second frequency by performing the second soft handoff. 27. The gateway of claim 21, wherein the first and second sectors overlap one another.
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이 특허에 인용된 특허 (9)
Czaja, Stanislaw; Anderson, Kraig, Forward link inter-generation soft handoff between 2G and 3G CDMA systems.
Jalloul, Louay; Tenbrook, Keith A.; Luz, Yuda Yehuda; Chen, Jiangnan (Jason); Rotstein, Ron, Method and apparatus for soft handoff communications in a communication system operating according to IS-95B and IS-95C standards.
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