METHODS AND APPARATUS FOR CELL SELECTION/RESELECTION OF A MOBILE TERIMINAL FROM A LEGACY NETWORK TO AN ADVANCED NETWORK

• US 20110098046A1
• Filed: 12/14/2009
• Published: 04/28/2011
• Est. Priority Date: 10/23/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SHIN, Jong-Keol
• Granted Patent: US 9,220,055 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• 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

Methods and apparatus are provided for performing a cell selection by a multi-mode terminal from a legacy network (2G, 3G) to a advanced network (4G). The terminal performs the cell selection upon the existence of a Base Station (BS) on the advanced network system. The terminal does not attempt to perform the cell selection when the LTE BS does not exist.

Claims

1. A method for creating a mapping table in an advanced network by a terminal, comprising:

receiving information from a Base Station (BS) of the advanced network;

storing a cell IDentification (ID) of each of a legacy network and the advanced network, using the information;

creating the mapping table between the legacy network and the advanced network using the cell IDs.

2. The method of claim 1, wherein the information includes a Master Information Block (MIB) and a System Information Block (SIB), and the BS is an evolved Node B.

3. The method of claim 1, wherein the legacy network is at least one of a Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA) and a Wideband CDMA network.

4. The method of claim 1, wherein the advanced network is at least one of a Long Term Evolution (LTE) network and an Advanced LTE network.

5. The method of claim 1, wherein the terminal is a multi-mode terminal supporting the legacy network and the advanced network.

6. The method of claim 5, wherein the terminal receives a first System Information Block (SIB) including frequency information of a first legacy network, and a second SIB including frequency information of a second legacy network that is different from the first legacy network.

7. The method of claim 6, wherein the terminal connects to the advanced network using the frequency information included in the first and second SIBs.

8. The method of claim 1, further comprising:

receiving new information; and

updating the mapping table using the new information.

9. A method for performing cell reselection from a legacy network to an advanced network by a terminal, comprising:

pre-storing, in the terminal, a cell IDentification (ID) of each of the legacy network and the advanced network in a mapping table;

connecting to the advanced network using the pre-stored cell identifications;

receiving information of the legacy network or the advanced network; and

updating the mapping table using the information.

10. The method of claim 9, wherein the information is received from an evolved Node B of the advanced network.

11. The method of claim 9, wherein the information includes a new cell ID that is received when the terminal performs a measurement of the legacy network.

12. A system for cell selection, comprising:

a terminal for transmitting a report including a first cell IDentification (ID) of a neighbor cell; and

a Base Station (BS) for receiving the first cell ID and transmitting a command message for obtaining a second cell ID of the neighbor cell,

wherein the terminal receives the command message, obtains the second cell ID and stores the second cell ID in a mapping table, for cell selection.

13. The system of claim 12, wherein the first cell ID comprises a physical cell ID of the legacy network, and the second cell ID comprises a Global cell ID of the legacy network.

14. The system of claim 12, wherein the BS comprises an evolved Node B (eNB) of an advanced network.

15. A method for cell reselection from a legacy network to an advanced network, comprising:

performing registration with the legacy network;

entering an idle state, when a received signal from the legacy network is less than a threshold;

accessing a cell IDentification (ID) of the legacy network and the advanced network from a mapping table; and

performing the cell reselection from the legacy network to the advanced network, when the received signal of the advanced network is greater than a threshold.

16. The method of claim 15, wherein the cell ID includes a Global cell ID that is received from an evolved Node B (eNB) through a Broadcast Control CHannel (BCCH) message, and is stored in the mapping table.

17. The method of claim 16, wherein the cell ID is re-accessed from the mapping table and another cell selection is performed, when the cell ID changes or cell reselection is unsuccessful.

18. An apparatus for cell reselection, comprising:

a receiver for receiving a location of a Base Station (BS); and

a controller for determining a distance from the location of the BS to a location of a terminal and performing the cell reselection when the distance is less than a predefined threshold.

19. The apparatus of claim 18, wherein the BS comprises an evolved Node B (eNB) of a new standard network.

20. The apparatus of claim 18, wherein the location information of the BS and the terminal comprises a Global Positioning System (GPS) location.

21. The apparatus of claim 18, wherein the location of the BS is pre-stored in the terminal or is received by a control message or a command.

22. The apparatus of claim 18, wherein the location of the BS or terminal is determined by a triangulation method.