METHOD AND APPARATUS FOR DECREASING LATENCIES DURING HANDOVER

• US 20070037576A1
• Filed: 08/03/2006
• Published: 02/15/2007
• Est. Priority Date: 08/13/2005
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Agrawal, Rajeev, Bedekar, Anand, Tzavidas, Stavros, Subramanian, Vijay
• Granted Patent: US 8,175,600 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0064 of control information between different access points

Abstract

A method and apparatus for handing over a mobile station (106) from a serving base station (104a) to a target base station (104b) within a wireless communication system (100) is described. A session is established between the mobile station and the serving base station and it is determined that the mobile station is to be handed over from the serving base station to the target base station. The target base station notifies the serving base station of identifying data of the target base station and added to the identifying data is a message to be sent to mobile station regarding the handover of the mobile station. The serving base station sends the message including the identifying data to the mobile station and the mobile station is handed over from the serving base station to the target base station using the identifying data of the target base station.

Claims

1-6. -6. (canceled)

7. A method of handing over a mobile station from a serving base station to a target base station within a wireless communication system, the method comprising:

establishing a session between the mobile station and the serving base station;

determining that the mobile station is to be handed over from the serving base station to the target base station;

notifying the serving base station by the target base station of identifying data of the target base station;

adding the identifying data to a message to be sent to mobile station regarding the handover of the mobile station from the serving base station to the target base station;

sending the mobile station the message including the identifying data, and

handing over the mobile station from the serving base station to the target base station using the identifying data of the target base station.

8. The method according to claim 7 wherein the message is a request for a handover message sent by the serving base station to mobile station.

9. The method according to claim 7 wherein the message is a response to a request for a handover message sent by the serving base station to the mobile station.

10. The method according to claim 7 wherein the message is a scanning message sent by the serving base station to the mobile station.

11. The method according to claim 7 wherein the identifying data includes an uplink channel identifier of the target base station.

12. The method according to claim 7 wherein the identifying data includes a downlink channel identifier of the target base station.

27. The method according to claim 7 wherein handing over the mobile station comprises the mobile station scanning for the target base station.

28. The method according to claim 7 wherein handing over the mobile station comprises the mobile station associating with the target base station.

13. (canceled)

14. A serving base station for use within a wireless communications system in communication, the base station comprising:

a memory;

a transmitter to send messages to a target base station within the wireless communication system and to a mobile station within the wireless communication system;

a receiver to receive messages to the target base station and the mobile station,

wherein the transmitter sends channel identifiers of the target base station to the mobile station wherein the channel identifiers is added to a handover process message sent before the handover of the mobile station from the serving base station to the target handover base station.

16. The base station according to claim 14 wherein the handover process message is a scan response sent from the serving base station to the mobile station.

17. The base station according to claim 14 wherein the handover process message is a base station handover request message sent from the serving base station to the mobile station.

18. The base station according to claim 14 wherein the handover process message is a base station handover response message sent from the serving base station to the mobile station.

19. The base station according to claim 14 wherein the channel parameters include an uplink channel descriptor.

20. The base station according to claim 14 wherein the channel parameters include a downlink channel descriptor.

15. (canceled)

21. A method comprising:

establishing a session between a first station within a communication system and a second station within the communication system, wherein the second station includes information about a third station within the communication system, and where the second station and the third station broadcast identifying data;

updating the second station with a timing that the third station will be broadcasting its identifying data;

arranging a timing of a connection of the first station to the third station based on the timing the third station will be broadcasting its identifying data received by the third station, and

connecting the session between the first station and the second station to a session between the first station and the third station at the timing that the third station broadcasts its identifying information.

22. The method according to claim 21 wherein the identifying data includes a channel descriptor of the third station.

23. The method of claim 21 wherein the arranging a timing step comprises providing the timing in a response sent from the second station to the first station to a request from the first station for a handover of the session from the second station to the third station.

24. The method of claim 21 wherein the arranging a timing step comprises providing the timing in a request sent from the second station to the first station for a handover of the session from the second station to the third station.

25. The method according to claim 21 wherein the connecting step comprises the first station scanning for the third station.

26. A method comprising:

storing identifying information of an uplink channel where the identifying information of the uplink is to be decoded,

receiving identifying information of a downlink channel after storing the identifying information of the uplink channel

decoding the stored identifying information of the uplink channel using the received identified information of the downlink channel, and

initiating random access procedure with the decoded identifying information of the uplink channel.