Claims
- 1. An apparatus for a soft handoff, comprising:
a plurality of base station transceivers; and a mobile station configured to:
measure power of signals transmitted by said plurality of base station transceivers; identify each base station transceiver whose measured signal power is greater than a threshold; place indicators of said identified base station transceivers to a first set; transmit the indicators; and establish a traffic channel to at least one of the identified base station transceivers not in communication with the mobile station via a traffic channel.
- 2. The apparatus of claim 1 wherein the mobile station places indicators of said identified base station transceivers to a first set by being configured to:
determine indicators of said identified base station transceivers not included in the first set; and place the determined indicators to the first set.
- 3. The apparatus of claim 1 wherein the mobile station transmits the indicators by being configured to:
transmit the indicators from the first set.
- 4. The apparatus of claim 1 wherein the mobile station transmits the indicators by being configured to:
determine indicators of said identified base station transceivers not included in the first set; and transmit the determined indicators.
- 5. The apparatus of claim 1 wherein said plurality of base station transceivers are configured to:
receive transmission of indicators; and send a direction message if a base station transceiver is identified by the indicators.
- 6. The apparatus of claim 1 wherein said mobile station is further configured to:
receive a direction message.
- 7. The apparatus of claim 1 wherein the direction message comprises an identification of at least one neighboring base station transceiver.
- 8. The apparatus of claim 6 wherein said mobile station is further configured to:
adjust the indicators in the first set in accordance with the direction message.
- 9. The apparatus of claim 1 wherein said mobile station is further configured to:
use the indicators in the active set to search for the direction message.
- 10. The apparatus of claim 1, wherein a first set of said plurality of base station transceivers is configured to:
provide coverage to a cell in a cellular system.
- 11. The apparatus of claim 1, wherein a second set of said plurality of base station transceivers is configured to:
provide coverage to a sector of a cell in a cellular system.
- 12. In a communication system consisting of a plurality of base station transceivers transmitting signals on at least two channels and at least one mobile station capable of receiving the channels a method for a soft handoff, comprising:
measuring a signal strength for each of received plurality of first channels at a mobile station; identifying the first channels whose measured signal power is greater than a threshold at the mobile station; and placing indicators of said identified first channels to a first set at the mobile station.
- 13. The method as claimed in claim 12 wherein said placing indicators of said identified first channels to a first set, comprises:
determining indicators of said identified first channels not included in the first set; and placing said determined indicators to the first set.
- 14. The method of claim 12 further comprising:
searching for a direction message using the indicators contained in the first set.
- 15. The method of claim 12 further comprising receiving a direction message at the mobile station.
- 16. The method of claim 15 further comprising:
adjusting the indicators of the first set in accordance with the direction message.
- 17. The method of claim 12 further comprising:
transmitting the indicators from the mobile station.
- 18. The method of claim 17 wherein said transmitting the indicators comprises:
transmitting the indicators placed to the first set.
- 19. The method of claim 17 wherein said transmitting the indicators comprises:
determining indicators of said identified first channels not included in the first set; and transmitting said determined indicators.
- 20. In a communication system consisting of a plurality of base station transceivers transmitting signals on at least two channels and at least one mobile station capable of receiving the channels an apparatus for a soft handoff, comprising:
a mobile station configured to:
measure a signal strength for each of received plurality of first channels; identifying the first channels whose measured signal power is greater than a threshold; and placing indicators of said identified first channels to a first set.
- 21. The apparatus as claimed in claim 20 wherein said mobile station places indicators of said identified first channels to a first set by being configured to:
determine indicators of said identified first channels not included in the first set; and place said determined indicators to the first set.
- 22. The apparatus of claim 20 wherein said mobile station is further configured to:
search for a direction message using the indicators contained in the first set.
- 23. The apparatus of claim 20 wherein said mobile station is further configured to:
receive a direction message.
- 24. The apparatus of claim 23 wherein said mobile station is further configured to:
adjust the indicators in the first set in accordance with the direction message.
- 25. The apparatus of claim 20 wherein said mobile station is further configured to:
transmit the indicators.
- 26. The apparatus of claim 20 wherein said mobile station is configured to:
transmit the indicators placed to the first set.
- 27. The apparatus of claim 20 wherein said mobile station is configured to:
determine indicators of the identified first channels not included in the first set; and transmit the determined indicators.
CROSS REFERENCE
[0001] This application is a continuation application of application Ser. No. 09/158,665, filed Sep. 22, 1998, entitled “Method for Robust Handoff in Wireless Communication System and currently assigned to the assignee of the present application.
Continuations (1)
|
Number |
Date |
Country |
Parent |
09158665 |
Sep 1998 |
US |
Child |
10020036 |
Dec 2001 |
US |