Apparatus and method for system selection

• US 20050266844A1
• Filed: 05/25/2004
• Published: 12/01/2005
• Est. Priority Date: 05/25/2004
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Narasimha, Murali
• Granted Patent: US 7,206,578 B2
• Time in Patent Office: Days
• US Class Current: 455/435.200
• 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 56/00 Synchronisation arrangements
• 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

An apparatus and method of system selection. A synchronization channel is received. A synchronization channel message received on the synchronization channel is decoded. An acquisition assistance channel is received. An advanced services information message received on the acquisition assistance channel is decoded. A system is selected based on the advanced services information message.

Claims

1. A method for system selection in a wireless communication device, the method comprising:

receiving a synchronization channel;

decoding a synchronization channel message received on the synchronization channel;

receiving an acquisition assistance channel;

decoding an advanced services information message received on the acquisition assistance channel; and

selecting a system based on the advanced services information message.

2. The method according to claim 1, further comprising:

selecting a current channel;

acquiring a pilot channel; and

synchronizing to a pilot pseudorandom noise code.

3. The method according to claim 2, wherein selecting a system further comprises determining from the advanced services information message if a desired service is available on a current system.

4. The method according to claim 3, wherein selecting a system further comprises:

if a desired service is available on the current system and the current system can be used, selecting the current system for operation of the wireless communication device; and

if a desired service is not available on the current system, selecting another channel and repeating acquiring, synchronizing, receiving a synchronization channel, decoding a synchronization channel message, receiving an acquisition assistance channel, and decoding an advanced services information message.

5. The method according to claim 1, wherein the acquisition assistance channel is a different channel from the synchronization channel.

6. The method according to claim 1, wherein the acquisition assistance channel includes an encoded, interleaved, spread, and modulated signal.

7. The method according to claim 1, wherein the acquisition assistance channel includes an acquisition assistance channel superframe having three acquisition assistance channel frames.

8. The method according to claim 1, wherein the acquisition assistance channel includes an advanced services information message, the advanced services information message including at least one of a push-to-talk service availability, a broadcast multicast service availability, alternate network availability, and a list of service options available.

9. The method according to claim 1, wherein receiving a synchronization channel and decoding a synchronization channel message are performed concurrently with receiving an acquisition assistance channel and decoding an advanced services information message.

10. The method according to claim 1, wherein receiving a synchronization channel and decoding a synchronization channel message are performed separately from receiving an acquisition assistance channel and decoding an advanced services information message.

11. A wireless communication device comprising:

a transceiver configured to receive a synchronization channel and an acquisition assistance channel;

a controller coupled to the transceiver, the controller configured to control operations of the wireless communication device;

a synchronization channel module coupled to the controller, the synchronization channel module configured to decode a synchronization channel message received on the synchronization channel;

a acquisition assistance channel module coupled to the controller, the acquisition assistance channel module configured to decode an advanced services information message received on the acquisition assistance channel; and

a system selection module coupled to the controller, the system selection module configured to select a system based on the advanced services information message.

12. The wireless communication device according to claim 11, wherein the controller is further configured to select a current channel, acquire a pilot channel, and synchronize to a pilot pseudorandom noise code.

13. The wireless communication device according to claim 12, wherein the system selection module is further configured to determine, from the advanced services information message, if a desired service is available on a current system.

14. The wireless communication device according to claim 13, wherein the system selection module is further configured to select the current system for operation of the wireless communication device if a desired service is available on the current system and the current system can be used, and if a desired service is not available on the current system, select another channel and instruct the wireless communication device to repeat acquiring, synchronizing, receiving a synchronization channel, decoding a synchronization channel message, receiving an acquisition assistance channel, and decoding an advanced services information message.

15. The wireless communication device according to claim 11, wherein the acquisition assistance channel is a different channel from the synchronization channel.

16. The wireless communication device according to claim 11, wherein the acquisition assistance channel includes an encoded, interleaved, spread, and modulated signal.

17. The wireless communication device according to claim 11, wherein the acquisition assistance channel includes an acquisition assistance channel superframe having three acquisition assistance channel frames.

18. The wireless communication device according to claim 11, wherein the acquisition assistance channel includes an advanced services information message, the advanced services information message including at least one of a push-to-talk service availability, a broadcast multicast service availability, alternate network availability, and a list of service options available.

19. The wireless communication device according to claim 11, wherein the synchronization channel module decodes the synchronization channel message concurrently with the acquisition assistance channel module decoding the advanced services information message.

20. The wireless communication device according to claim 11, wherein the synchronization channel module decodes the synchronization channel message separately from the acquisition assistance channel module decoding the advanced services information message.

21. A method for system selection in a wireless communication device, the method comprising:

selecting a current channel;

acquiring a pilot channel;

synchronizing to a pilot pseudorandom noise code;

receiving a synchronization channel;

decoding a synchronization channel message received on the synchronization channel;

receiving an acquisition assistance channel;

decoding an advanced services information message received on the acquisition assistance channel; and

selecting a system based on the advanced services information message,

wherein the acquisition assistance channel is a different channel from the synchronization channel.

22. A method for system selection in a wireless communication device, the method comprising:

receiving a synchronization channel;

decoding a synchronization channel message received on the synchronization channel;

decoding an advanced services information message received on the synchronization channel, and

selecting a system based on the advanced services information message

23. The method according to claim 22, further comprising:

selecting a current channel;

acquiring a pilot channel; and

synchronizing to a pilot pseudorandom noise code.

24. The method according to claim 23, wherein selecting a system further comprises determining from the advanced services information message if a desired service is available on a current system.

25. The method according to claim 24, wherein selecting a system further comprises:

if a desired service is available on the current system and the current system can be used, selecting the current system for operation of the wireless communication device; and

if a desired service is not available on the current system, selecting another channel and repeating acquiring, synchronizing, receiving a synchronization channel, decoding a synchronization channel message, and decoding an advanced services information message.

26. A wireless communication device comprising:

a transceiver configured to receive a synchronization channel and an acquisition assistance channel;

a controller coupled to the transceiver;

the controller configured to control operations of the wireless communication device;

a synchronization channel module coupled to the controller, the synchronization channel module configured to decode a synchronization channel message received on the synchronization channel, the synchronization channel module further configured to decode an advanced services information message received on the synchronization channel; and

a system selection module coupled to the controller, the system selection module configured to select a system based on the advanced services information message.

27. The wireless communication device according to claim 26, wherein the controller is further configured to select a current channel, acquire a pilot channel, and synchronize to a pilot pseudorandom noise code.

28. The wireless communication device according to claim 27, wherein the system selection module is further configured to determine, from the advanced services information message, if a desired service is available on a current system.