METHOD AND SYSTEM FOR IMPROVING FRAME SYNCHRONIZATION, CHANNEL ESTIMATION AND ACCESS IN WIRELESS COMMUNICATION NETWORKS

• US 20070248076A1
• Filed: 04/17/2007
• Published: 10/25/2007
• Est. Priority Date: 04/21/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Mazzarese, David, Ding, Yinong, Ji, Baowei
• Application Number:
  US11/736,158
• Publication Number:
  US 20070248076A1
• Time in Patent Office: Days
• US Class Current: 370/350
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 27/2656 Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 72/535 based on resource usage policies

Abstract

A method and system for improving frame synchronization, channel estimation and access in a wireless network are disclosed. As one example, a method for improving frame synchronization and channel estimation in a wireless network is disclosed. The method includes the steps of generating a first preamble for a frame, generating a false control message for the frame, and scheduling a quiet interval for the frame.

Claims

1. A method for improving frame synchronization and channel estimation in a wireless network, comprising the steps of:

generating a first preamble for a frame;

generating a false control message for the frame; and

scheduling a quiet interval for the frame.

2. The method of claim 1, further comprising the step of:

transmitting the first preamble, false control message, and scheduled quiet interval as a quiet frame.

3. The method of claim 1, wherein the false control message is a dummy broadcast message.

4. The method of claim 1, wherein the first preamble includes information that identifies the frame as a quiet frame.

5. The method of claim 1, wherein a portion of the frame includes a quiet indication bit.

6. The method of claim 1, wherein the generating and scheduling steps are performed by a processing unit associated with a Base Station in the wireless network.

7. The method of claim 1, further comprising the steps of:

generating a superframe header;

generating a non-quiet frame;

appending the non-quiet frame to the superframe header;

transmitting the superframe header and the non-quiet frame; and

transmitting the first preamble, false control message, and scheduled quiet interval as a quiet frame.

8. A method for improving frame synchronization and channel estimation in a wireless network, comprising the steps of:

generating a superframe;

inserting at least one frame in the superframe;

inserting a second frame in the superframe, the second frame including a preamble, a dummy broadcast message, and a quiet interval; and

transmitting the superframe.

9. The method of claim 8, wherein the quiet interval comprises at least one of a quiet sub-channel and a quiet sub-carrier.

10. The method of claim 8, further comprising the step of:

listening for a channel during the quiet interval.

11. The method of claim 8, wherein the steps are performed by a Base Station in a Cognitive Radio-based network.

12. The method of claim 8, wherein the second frame is scheduled periodically in a plurality of superframes.

13. The method of claim 8, wherein the second frame is scheduled opportunistically in a plurality of superframes.

14. A method for maintaining or recovering synchronization in a wireless network, comprising the steps of:

generating a first frame;

determining if the first frame is a quiet frame;

if the first frame is a quiet frame, inserting an extended preamble in a second frame; and

transmitting the second frame two symbols prior to the end of the first frame.

15. A method for maintaining or recovering synchronization in a wireless network, comprising the steps of:

determining if a quiet transmission period is occurring; and

if a quiet transmission period is occurring, generating a frame, inserting an extended preamble in the frame, and transmitting the frame.

16. The method of claim 15, wherein the transmitting step further comprises transmitting the frame two symbols prior to the end of the quiet transmission period.

17. The method of claim 15, wherein the length of the quiet transmission period is greater than the length of a quiet frame.

18. A system for improving frame synchronization and channel estimation in a wireless network, comprising:

a base station; and

at least one user transceiver coupled to the base station by a radio air interface, the base station configured to;

generate a first preamble for a frame;

generate a false control message for the frame; and

schedule a quiet interval for the frame.

19. A system for improving frame synchronization and channel estimation in a wireless network, comprising:

a base station; and

at least one user transceiver coupled to the base station by a radio air interface, the base station configured to;

generate a superframe;

insert at least one frame in the superframe;

insert a second frame in the superframe, the second frame including a preamble, a dummy broadcast message, and a quiet interval; and

transmit the superframe.

20. A system for maintaining or recovering synchronization in a wireless network, comprising:

a base station; and

at least one user transceiver coupled to the base station by a radio air interface, the base station configured to;

generate a first frame;

determine if the first frame is a quiet frame;

if the first frame is a quiet frame, insert an extended preamble in a second frame; and

transmit the second frame two symbols prior to the end of the first frame.

21. A system for maintaining or recovering synchronization in a wireless network, comprising:

a base station; and

at least one user transceiver coupled to the base station by a radio air interface, the base station configured to;

determine if a quiet transmission period is occurring; and

if a quiet transmission period is occurring, generate a frame, insert an extended preamble in the frame, and transmit the frame.

22. The system of claim 21, wherein the base station is further configured to:

if a quiet transmission period is occurring, transmit the frame two symbols prior to the end of the quiet transmission period.