Group call management through receive/transmit synchronization

• US 20050079883A1
• Filed: 10/09/2003
• Published: 04/14/2005
• Est. Priority Date: 10/09/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Liu, Bin, Khawand, Charbel, Miller, Jianping W.
• Granted Patent: US 7,366,532 B2
• Time in Patent Office: Days
• US Class Current: 455/502
• CPC Class Codes: H04B 7/269 Master/slave synchronisation
• CPC Class Codes: H04W 56/002 Mutual synchronization
• CPC Class Codes: H04W 56/0035 detecting errors in frequency or phase
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

A method of communicating with a transceiver (120). In one arrangement, the method of communicating with the transceiver can be performed in a systemless group environment. Synchronization information (150) can be received from a mobile transceiver (110) and used to synchronize to the mobile transceiver. The synchronization information can include a timing offset and a frequency offset. Synchronization can be maintained until a predetermined condition is met, for example, a predetermined amount of group inactivity.

Claims

1. A method of communicating with a transceiver comprising the steps of:

receiving synchronization information from a mobile transceiver;

synchronizing to the mobile transceiver using the synchronization information; and

maintaining synchronization with the mobile transmitter until a predetermined condition is met.

2. The method according to claim 1, wherein the predetermined condition comprises a predetermined amount of group inactivity.

3. The method according to claim 1, wherein said receiving synchronization information step comprises receiving a timing offset and a frequency offset.

4. The method according to claim 1, further comprising the step of transmitting a transmission request comprising a preamble, the transmission request being transmitted in a time slot synchronized with the mobile transceiver.

5. The method according to claim 4, wherein the transmission request further comprises synchronization information.

6. The method according to claim 4, further comprising the step of randomly selecting the synchronized time slot.

7. The method according to claim 1, wherein the method of communicating with a transceiver is performed in a systemless group environment.

8. A method of communicating with a transceiver comprising the steps of:

transmitting synchronization information to at least one transceiver, the synchronization information establishing group synchronization with the at least one transceiver; and

maintaining synchronization with the at least one transceiver until a predetermined condition is met.

9. The method according to claim 8, wherein the predetermined condition comprises a predetermined amount of group inactivity.

10. The method according to claim 8, wherein said transmitting synchronization information step comprises transmitting a timing offset and a frequency offset.

11. The method according to claim 8, further comprising the step of receiving a transmission request from the at least one transceiver, the transmission request comprising a preamble and the transmission request being received in a synchronous time slot.

12. The method according to claim 11, wherein the transmission request further comprises synchronization information.

13. The method according to claim 8, further comprising the step of transmitting synchronization information to a second transceiver, the synchronization information establishing group synchronization with the second transceiver.

14. The method according to claim 13, wherein said step of transmitting synchronization information to the second transceiver is performed after said step of transmitting synchronization information to the at least one transceiver.

15. The method according to claim 8, wherein the method of communicating with a transceiver is performed in a systemless group environment.

16. A machine-readable storage, having stored thereon a computer program having a plurality of code sections executable by a machine for causing the machine to perform the steps of:

receiving synchronization information from a mobile transceiver;

synchronizing to the mobile transceiver using the synchronization information; and

maintaining synchronization with the mobile transmitter until a predetermined condition is met.

17. The machine readable storage of claim 16, wherein the predetermined condition comprises a predetermined amount of group inactivity.

18. The machine readable storage of claim 16, further comprising the step of transmitting a transmission request comprising a preamble, the transmission request being transmitted in a time slot synchronized with the mobile transceiver.

19. The machine readable storage of claim 16, wherein the method of communicating with a transceiver is performed in a systemless group environment.

20. A machine-readable storage, having stored thereon a computer program having a plurality of code sections executable by a machine for causing the machine to perform the steps of:

transmitting synchronization information to at least one transceiver, the synchronization information establishing group synchronization with the at least one transceiver; and

maintaining synchronization with the at least one transceiver until a predetermined condition is met.

21. The machine readable storage of claim 20, wherein the predetermined condition comprises a predetermined amount of group inactivity.

22. The machine readable storage of claim 20, wherein the method of communicating with a transceiver is performed in a systemless group environment