METHOD AND APPARATUS FOR HANDOVER IN A MOBILE STATION SUPPORTING RADIO ACCESS TECHNOLOGY

• US 20110188471A1
• Filed: 02/02/2011
• Published: 08/04/2011
• Est. Priority Date: 02/02/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Hye-Jeong
• Granted Patent: US 9,374,730 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method and apparatus supports Inter-Radio Access Technology (IRAT) Packet Switch (PS) handover during a simultaneous voice and data (SVD) mode in a mobile station that supports a Radio Access Technology (RAT). The method includes determining a state in which a data call is connected through a first system and a voice call is connected through a second system. The MS determines whether handover to the second system should be performed for the data call. A measurement report message that indicates a set of active base stations (BSs) of voice call connection in the second system is generated. And the measurement report message is transmitted to a serving BS of the data call connection in the first system.

Claims

1. A method for handover in a mobile station (MS) supporting a Radio Access Technology (RAT), the method comprising:

determining a state in which a data call is connected through a first system and a voice call is connected through a second system;

determining whether handover to the second system should be performed for the data call;

generating a measurement report message that indicates a set of active base stations (BSs) of voice call connection in the second system; and

transmitting the measurement report message to a serving BS of the data call connection in the first system.

2. The method of claim 1, wherein generating the measurement report message indicates whether each of a plurality of neighboring BSs in the second system, for which a measured signal intensity is greater than a preset threshold value, corresponds to the set of active BSs.

3. The method of claim 1, wherein the measurement report message indicates a priority value for each of a plurality of neighboring BSs in the second system, for which a measured signal intensity is greater than a preset threshold value, and

wherein the priority values of BSs that correspond to the set of active BSs are set higher than the priority values of BSs that do not correspond to the set of active BSs.

4. The method of claim 3, wherein the priority value of each of the BSs is set based on at least one of a Reference Signal Receive Power (RSRP), a Receive Signal Strength Indicator (RSSI), a pilot strength, recently camped BS information, information on a BS with the highest number of times of camping, and long-time camped BS information.

5. The method of claim 1, wherein the measurement report message comprises information of at least one BS that corresponds to the set of active BSs from among a plurality of neighboring BSs in the second system for which measured signal intensities are greater than a preset threshold value.

6. The method of claim 1, wherein generating the measurement report message comprises:

determining a plurality of neighboring BSs in the second system for which signal intensities are greater than a preset threshold value; and

setting a signal intensity for each of the plurality of neighboring BSs that corresponds to the set of active BSs to a different value.

7. The method of claim 6, wherein the signal intensity for each of the plurality of neighboring BSs that corresponds to the set of active BSs is set higher than the signal intensities of BSs that do not correspond to the set of active BSs.

8. The method of claim 7, wherein the signal intensity of the active BS is set based on at least one of a Reference Signal Receive Power (RSRP), a Receive Signal Strength Indicator (RSSI), a pilot strength, recently camped BS information, information on a BS with the highest number of times of camping, and long-time camped BS information.

9. The method of claim 1, wherein the handover to the second system is performed when an intensity of a signal received from a BS of the first system is below a threshold value and an intensity of a signal received from a BS of the second system is above the threshold value.

10. The method of claim 1, further comprising:

receiving a handover instruction message from the serving BS; and

performing the handover according to the handover instruction message.

11. An apparatus for handover in a mobile station supporting a Radio Access Technology (RAT), the apparatus comprising:

a first transceiver configured to transmit and receive signals of a first system;

a second transceiver configured to transmit and receive signals of a second system; and

a controller configured to determine a state in which a data call is connected through the first system and a voice call is connected through the second system, determine whether handover to the second system should be performed for the data call, generate a measurement report message that indicates a set of active base stations (BSs) of voice call connection, and transmit the measurement report message to a serving BS of the data call connection in the first system.

12. The apparatus of claim 11, wherein the measurement report message indicates whether each of a plurality of neighboring BSs in the second system, for which a measured signal intensity is greater than a preset threshold value, corresponds to the set of active BSs.

13. The apparatus of claim 11, wherein the measurement report message indicates a priority value for each of a plurality of BSs in the second system, for which a measured signal intensity is greater than a preset threshold value, and

wherein the priority values of BSs that correspond to the set of active BSs are set higher than the priority values of BSs that do not correspond to the set of active BSs.

14. The apparatus of claim 13, wherein the priority value of each of the BSs is set based on at least one of a Reference Signal Receive Power (RSRP), a Receive Signal Strength Indicator (RSSI), a pilot strength, recently camped BS information, information on a BS with the highest number of times of camping, and long-time camped BS information.

15. The apparatus of claim 11, wherein the measurement report message comprises information of at least one BS that corresponds to the set of active BSs from among a plurality of neighboring BSs in the second system for which measured signal intensities are greater than a preset threshold value.

16. The apparatus of claim 11, wherein the controller determines a plurality of neighboring BSs in the second system for which signal intensities are greater than a preset threshold value, and sets a signal intensity for each of the plurality of neighboring BSs that corresponds to the set of active BSs to a different value.

17. The apparatus of claim 16, wherein the controller sets the signal intensity for each of the plurality of neighboring BSs that corresponds to the set of active BSs to be higher than the signal intensities of BSs that do not correspond to the set of active BSs.

18. The apparatus of claim 17, wherein the signal intensity of the active BS is set based on at least one of a Reference Signal Receive Power (RSRP), a Receive Signal Strength Indicator (RSSI), a pilot strength, recently camped BS information, information on a BS with the highest number of times of camping, and long-time camped BS information.

19. The apparatus of claim 11, wherein the controller determines to perform the handover to the second system is when an intensity of a signal received from a BS of the first system is below a threshold value and an intensity of a signal received from a BS of the second system is above the threshold value.

20. The apparatus of claim 11, wherein the first transceiver receives a handover instruction message from the serving BS, and the controller performs the handover according to the handover instruction message.