US20030108006A1 — Method and apparatus for effecting handoff betwee…

Claim 1

Independent Claim 190 words

1 . A method of effecting handoff of a mobile station from a first base station in a first cellular communications system controlled by a first mobile switching control station to a second base station in a second, different cellular system controlled by a second mobile switching control station, the method comprising: measuring at the mobile station a parameter of a signal transmitted by said first base station; measuring at the mobile station a parameter of a signal transmitted by said second base station; communicating a signal quality message from the mobile station via the first base station to said first mobile switching control station, when the parameters reach a predetermined condition; generating at the first mobile switching control station information for a channel request message for the second mobile switching control station; communicating the information from said first mobile switching control station to said mobile station; generating at the mobile station from the information from the first mobile switching control station a channel request message for the second mobile switching control station; and communicating the channel request message from the mobile station to the second mobile switching control station.

Claim 2

Dependent Claim 190 words

1 . A method of effecting handoff of a mobile station from a first base station in a first cellular communications system controlled by a first mobile switching control station to a second base station in a second, different cellular system controlled by a second mobile switching control station, the method comprising: measuring at the mobile station a parameter of a signal transmitted by said first base station; measuring at the mobile station a parameter of a signal transmitted by said second base station; communicating a signal quality message from the mobile station via the first base station to said first mobile switching control station, when the parameters reach a predetermined condition; generating at the first mobile switching control station information for a channel request message for the second mobile switching control station; communicating the information from said first mobile switching control station to said mobile station; generating at the mobile station from the information from the first mobile switching control station a channel request message for the second mobile switching control station; and communicating the channel request message from the mobile station to the second mobile switching control station.

Claim 3

Dependent Claim 34 words

2 . The method as claimed in claim 1 , further comprising generating at the second mobile switching control station channel information identifying a channel in the second communications system for the mobile station.

Claim 4

Dependent Claim 27 words

3 . The method as claimed in claim 2 , further comprising establishing communication between said mobile unit and said second base station in the identified channel.

Claim 5

Dependent Claim 23 words

4 . The method as claimed in claim 3 , further comprising discontinuing communication between said mobile unit and said first base station.

Claim 6

Dependent Claim 17 words

5 . The method as claimed in claim 1 , wherein said parameter corresponds to signal strength.

Claim 7

Dependent Claim 20 words

6 . The method as claimed in claim 1 , wherein said first cellular communications system is a CDMA system.

Claim 8

Dependent Claim 20 words

7 . The method as claimed in claim 6 , wherein said second cellular communications system is a GSM system.

Claim 9

Dependent Claim 151 words

8 . A mobile station comprising: a first transceiver chain operable to receive and transmit signals with a first base station in a first cellular communications system; a second transceiver chain operable to receive and transmit signals with a second base station in a second cellular communications system; and a controller for: measuring a parameter of a signal transmitted by said first base station; measuring a parameter of a signal transmitted by said second base station; communicating a signal quality message from the mobile station via the first base station to said first cellular communications system, when the parameters reach a predetermined condition; receiving from the first base station information for a channel request message for the second cellular communications system; generating from the information from the first base station a channel request message for the second cellular communications system; and communicating the channel request message to the second mobile station.

Claim 10

Dependent Claim 151 words

8 . A mobile station comprising: a first transceiver chain operable to receive and transmit signals with a first base station in a first cellular communications system; a second transceiver chain operable to receive and transmit signals with a second base station in a second cellular communications system; and a controller for: measuring a parameter of a signal transmitted by said first base station; measuring a parameter of a signal transmitted by said second base station; communicating a signal quality message from the mobile station via the first base station to said first cellular communications system, when the parameters reach a predetermined condition; receiving from the first base station information for a channel request message for the second cellular communications system; generating from the information from the first base station a channel request message for the second cellular communications system; and communicating the channel request message to the second mobile station.

Claim 11

Dependent Claim 37 words

9 . The mobile station as claimed in claim 8 , wherein the controller is further for receiving from said second base station channel information identifying a channel in the second communications system for the mobile station.

Claim 12

Dependent Claim 38 words

10 . The mobile station as claimed in claim 9 , wherein the controller is arranged to respond to the channel information by establishing communication between said mobile unit and said second base station in the identified channel.

Claim 13

Dependent Claim 34 words

11 . The mobile station as claimed in claim 10 , herein the controller is arranged to respond to the channel information by discontinuing communication between said mobile unit and said first base station.

Claim 14

Dependent Claim 18 words

12 . The mobile station as claimed in claim 8 , wherein said parameter corresponds to signal strength.

Claim 15

Dependent Claim 21 words

13 . The mobile station as claimed in claim 8 , wherein said first cellular communications system is a CDMA system.

Claim 16

Dependent Claim 21 words

14 . The mobile station as claimed in claim 13 , wherein said second cellular communications system is a GSM system.

Claim 17

Dependent Claim 25 words

15 . The mobile station as claimed in claim 8 , wherein the first transceiver chain is active when the second transceiver chain is inactive.

Claim 18

Dependent Claim 25 words

16 . The mobile station as claimed in claim 8 , wherein the second transceiver chain is active when the first transceiver chain is inactive.

Claim 19

Dependent Claim 204 words

17 . An apparatus for effecting handoff of a mobile station from a first base station in a first cellular communications system controlled by a first mobile switching control station to a second base station in a second, different cellular system controlled by a second mobile switching control station, the method comprising: means for measuring at the mobile station a parameter of a signal transmitted by said first base station; means for measuring at the mobile station a parameter of a signal transmitted by said second base station; means for communicating a signal quality message from the mobile station through the first base station to said first mobile switching control station, when the parameters reach a predetermined condition; means for generating at the first mobile switching control station information for a channel request message for the second mobile switching control station; means for communicating the information from said first mobile switching control station to said mobile station; means for generating at the mobile station from the information from the first mobile switching control station a channel request message for the second mobile switching control station; and means for communicating the channel request message from the mobile station to the second mobile switching control station.

Claim 20

Dependent Claim 204 words

17 . An apparatus for effecting handoff of a mobile station from a first base station in a first cellular communications system controlled by a first mobile switching control station to a second base station in a second, different cellular system controlled by a second mobile switching control station, the method comprising: means for measuring at the mobile station a parameter of a signal transmitted by said first base station; means for measuring at the mobile station a parameter of a signal transmitted by said second base station; means for communicating a signal quality message from the mobile station through the first base station to said first mobile switching control station, when the parameters reach a predetermined condition; means for generating at the first mobile switching control station information for a channel request message for the second mobile switching control station; means for communicating the information from said first mobile switching control station to said mobile station; means for generating at the mobile station from the information from the first mobile switching control station a channel request message for the second mobile switching control station; and means for communicating the channel request message from the mobile station to the second mobile switching control station.

Claim 21

Dependent Claim 36 words

18 . The apparatus as claimed in claim 17 , further comprising means for generating at the second mobile switching control station channel information identifying a channel in the second communications system for the mobile station.

Claim 22

Dependent Claim 29 words

19 . The apparatus as claimed in claim 18 , further comprising means for establishing communication between said mobile unit and said second base station in the identified channel.

Claim 23

Dependent Claim 25 words

20 . The apparatus as claimed in claim 19 , further comprising means for discontinuing communication between said mobile unit and said first base station.

Claim 24

Dependent Claim 17 words

21 . The apparatus as claimed in claim 17 , wherein said parameter corresponds to signal strength.

Claim 25

Dependent Claim 20 words

22 . The apparatus as claimed in claim 17 , wherein said first cellular communications system is a CDMA system.

Claim 26

Dependent Claim 20 words

23 . The apparatus as claimed in claim 22 , wherein said second cellular communications system is a GSM system.

Claim 27

Dependent Claim 20 words

24 . The apparatus as claimed in claim 22 , wherein said second cellular communication system is a GPRS system.

Method and apparatus for effecting handoff between different cellular communications systems

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