Base station synchronization for handover in a hybrid GSM/CDMA network

Abstract

A mobile wireless telecommunications system, which includes base stations (30) of a first type operating according to a first air interface, and base stations (36) of a second type operating according to a second air interface. Methods and apparatus are provided for handing over a mobile station (40) in the system from a first base station (30), which is of the first type, to a second base station (36), which is of the second type. A communications link is established over the first air interface between the mobile station (40) and the first base station (30). Data is received from the mobile station (40) responsive to a signal received by the mobile station (40) over the second air interface from the second base station (36), substantially without breaking the communications link with the first base station. The mobile station (40) is handed over from the first (30) to the second base station (36) responsive to the data received therefrom.

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Technology	Declaration Information			Specification Information	Explicitly Disclosed	Patent Type
Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Number	Explicitly Disclosed	Patent Type
3G	27/01/2010	ISLD-201004-004	QUALCOMM INC	S1 TS Number: TS 125 331 Version No: Illustrative part: ---- Release: + -	Yes	Family Member
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Technologies

Broadcast/Multicast

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Use Cases

Wireless communication

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Claim

1. In a mobile wireless telecommunications system, which includes base stations of a first type operating according to a first air interface, and base stations of a second type operating according to a second air interface, a method for handing over a mobile station in the system from a first base station, which is of the first type, to a second base station, which is of the second type, comprising: establishing a communications link over the first air interface between the mobile station and the first base station; receiving data from the mobile station responsive to a signal received by the mobile station over the second air interface from the second base station, substantially without breaking the communications link with the first base station; and handing over the mobile station from the first to the second base station responsive to the data received therefrom, wWarein receiving the data comprises receiving a measurement of signal strength, and wherein handing over the mobile station comprises comparing measurements of signal strengths from the first and second base stations and handing over the mobile station responsive to the comparison.

2. A method according to claim 1 , wherein receiving the data comprises applying a weighting factor to the measurement of signal strength.

3. A method according to claim 2, wherein applying the weighting factor comprises varying the factor according to a network condition in the system.

4. A method according to claim 2, wherein applying the weighting factor comprises transmitting a weighting factor over the communications link to the mobile station, which applies the weighting factor to the measurement.

5. A method according to claim 1 , wherein receiving the data comprises receiving an identification of the second base station based on decoding by the mobile station of the signal received over the second air interface. 150,472/3

6. A method according to claim 1 , and comprising transmitting from the first base station to the mobile station a list of frequencies of base stations of the second type in the system, such that the mobile station seeks to receive the signal at a frequency in the list.

7. A method according to claim 1, wherein handing over the mobile station comprises transmitting a handover command from the first base station.

8. A method according to claim 1, wherein establishing the communications link and receiving the data responsive to the signal comprise establishing the link and receiving the signal at the mobile station using a single RF transceiver in the mobile station.

9. An apparatus of facilitating intersystem handover of communications between a mobile station and at least one base station of a first wireless communications system to the mobile station and at least one base station of a second wireless communication system, the apparatus comprising: means for transmitting a message from the mobile station to the at least one base station of the first wireless communications system, the message including timing information about the at least one base station of the second wireless system; and means for determining relative timing between the at least one base station of the first wireless communications system and the at least one base station of the second wireless communications system. For the Applicant,']

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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)

The information in grey was provided by the patent holder

The information in purple was extracted from the FrandAvenue

Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.

Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.

Family member:related patents or applications that share a common priority or original filing.