USING IDENTIFICATION SEQUENCES IN WIRELESS COMMUNICATION SYSTEMS

• US 20100029278A1
• Filed: 06/17/2009
• Published: 02/04/2010
• Est. Priority Date: 07/07/2008
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Zhang, Wenfeng, Bhalla, Rajesh, Fang, Yonggang, Zhao, Xiaowu
• Granted Patent: US 8,675,621 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

Techniques, apparatuses, and systems for using identification sequences in a wireless communication system can include receiving information indicative of a pilot code detected by a wireless device, the pilot code being shared by multiple Femto Access Points (FAPs) that each provide wireless service in at least a portion of the coverage area; receiving information indicative of an identification sequence detected by the wireless device that is associated with the pilot code, using the information indicative of the identification sequence to identify one of the FAPs that share the pilot code; and performing a hand-off of the call to the identified FAP to continue to provide wireless service for the call via the identified FAP.

Claims

1. A method for operating a base station, comprising:

providing wireless service to wireless devices in a coverage area;

transacting a call with a wireless device;

receiving information indicative of a pilot code detected by the wireless device, the pilot code being shared by multiple Femto Access Points (FAPs) that each provide wireless service in at least a portion of the coverage area;

receiving information indicative of an identification sequence detected by the wireless device that is associated with the pilot code, wherein the wireless device detects different portions of the identification sequence over different periods of time;

using the information indicative of the identification sequence to identify one of the FAPs that share the pilot code; and

performing a hand-off of the call to the identified FAP to continue to provide wireless service for the call via the identified FAP.

2. The method of claim 1, wherein the identification sequence comprises two or more Pseudorandom Noise (PN) sequences in two or more different transmission frames.

3. The method of claim 1, wherein the identification sequence comprises two or more Walsh codes modulated on a Pseudorandom Noise (PN) sequence over different periods of time.

4. The method of claim 1, wherein receiving information indicative of the pilot code comprises receiving information indicative of the identification sequence.

5. The method of claim 1, further comprising:

operating the FAPs to each transmit a different identification sequence; and

transmitting assistance information to the wireless device to assist the wireless device in detecting one or more identification sequences.

6. The method of claim 1, wherein receiving information indicative of the identification sequence comprises receiving a value that corresponds to a FAP.

7. The method of claim 1, wherein receiving information indicative of the identification sequence comprises receiving different time indices and information detected by the wireless device during the time periods associated the time indices.

8. A wireless communication system, comprising:

two or more Femto Access Points (FAPs) configured to provide wireless service to wireless devices in different portions of a coverage area and transmit different identification sequences, wherein the two or more FAPs share a pilot code; and

a base station in communication with the two or more FAPs, comprising;

means for providing wireless service to wireless devices in the coverage area;

means for transacting a call with a wireless device;

means for receiving information indicative of a detected pilot code from the wireless device;

means for receiving information indicative of a detected identification sequence from the wireless device, the detected identification sequence being associated with the detected pilot code, wherein the wireless device detects different portions of the detected identification sequence over different periods of time;

means for using the information indicative of the detected identification sequence to identify one of the two or more FAPs; and

means for performing a hand-off of the call to the identified FAP to continue to provide wireless service for the call via the identified FAP.

9. The system of claim 8, wherein the detected identification sequence comprises two or more Pseudorandom Noise (PN) sequences in two or more different transmission frames.

10. The system of claim 8, wherein the detected identification sequence comprises two or more Walsh codes modulated on a Pseudorandom Noise (PN) sequence over different periods of time.

11. The system of claim 8, wherein the means for receiving information indicative of the detected pilot code comprises the means for receiving information indicative of the detected identification sequence.

12. The system of claim 8, wherein the base station further comprises:

means for transmitting a message to at least one of the two or more FAPs to request a transmission of an identification sequence; and

means for transmitting assistance information to the wireless device to assist the wireless device in detecting one or more identification sequences.

13. The system of claim 8, wherein the means for receiving information indicative of the detected identification sequence comprises means for receiving a value that corresponds to a FAP.

14. The system of claim 8, wherein the means for receiving information indicative of the detected identification sequence comprises means for receiving different time indices and information detected by the wireless device during the time periods associated the time indices.

15. An apparatus for wireless communications, comprising:

transceiver electronics to communicate with wireless devices in a coverage area; and

processor electronics, in communication with the transceiver electronics, configured to perform operations, the operations comprising;

transacting a call with a wireless device;

operating the transceiver electronics to receive information indicative of a pilot code detected by the wireless device, the pilot code being shared by multiple Femto Access Points (FAPs) that each provide wireless service in at least a portion of the coverage area;

operating the transceiver electronics to receive information indicative of an identification sequence detected by the wireless device that is associated with the pilot code, wherein the wireless device detects different portions of the identification sequence over different periods of time;

using the information indicative of the identification sequence to identify one of the FAPs that share the pilot code; and

performing a hand-off of the call to the identified FAP to continue to provide wireless service for the call via the identified FAP.

16. The apparatus of claim 15, wherein the identification sequence comprises two or more Pseudorandom Noise (PN) sequences in two or more different transmission frames.

17. The apparatus of claim 15, wherein the identification sequence comprises two or more Walsh codes modulated on a Pseudorandom Noise (PN) sequence over different periods of time.

18. The apparatus of claim 15, wherein receiving information indicative of the pilot code comprises receiving information indicative of the identification sequence.

19. The apparatus of claim 15, the operations further comprising:

operating the transceiver electronics to transmit a message to at least one of the two or more FAPs to request a transmission of an identification sequence; and

operating the transceiver electronics to transmit assistance information to the wireless device to assist the wireless device in detecting one or more identification sequences.

20. The apparatus of claim 15, wherein receiving information indicative of the detected identification sequence comprises receiving a value that corresponds to a FAP.

21. The apparatus of claim 15, wherein receiving information indicative of the detected identification sequence comprises receiving different time indices and information detected by the wireless device during the time periods associated the time indices.

22. An apparatus for wireless communications, comprising:

means for communicating with wireless devices in a coverage area;

means for transacting a call with a wireless device;

means for receiving information indicative of a pilot code detected by the wireless device, the pilot code being shared by multiple Femto Access Points (FAPs) that each provide wireless service in at least a portion of the coverage area;

means for receiving information indicative of an identification sequence detected by the wireless device that is associated with the pilot code, wherein the wireless device detects different portions of the identification sequence over different periods of time;

means for identifying one of the FAPs that share the pilot code, the means for identifying one of the FAPs being responsive to the information indicative of the identification sequence; and

means for performing a hand-off of the call to the identified FAP to continue to provide wireless service for the call via the identified FAP.

23. The apparatus of claim 22, wherein the identification sequence comprises two or more Pseudorandom Noise (PN) sequences in two or more different transmission frames.

24. The apparatus of claim 22, wherein the identification sequence comprises two or more Walsh codes modulated on a Pseudorandom Noise (PN) sequence over different periods of time.

25. The apparatus of claim 22, wherein the means for receiving information indicative of the pilot code comprises the means for receiving information indicative of the identification sequence.

26. The apparatus of claim 22, further comprising:

means for transmitting a message to at least one of the two or more FAPs to request a transmission of an identification sequence; and

means for transmitting assistance information to the wireless device to assist the wireless device in detecting one or more identification sequences.

27. The apparatus of claim 22, wherein the means for receiving information indicative of the detected identification sequence comprises means for receiving a value that corresponds to a FAP.

28. The apparatus of claim 22, wherein the means for receiving information indicative of the detected identification sequence comprises means for receiving different time indices and information detected by the wireless device during the time periods associated the time indices.

29. An apparatus for wireless communications, comprising:

transceiver electronics configured to communicate with wireless devices in a coverage area and transmit a signal indicative of a pilot code, the pilot code being shared by multiple base stations that provide wireless service to wireless devices in different portions of the coverage area; and

processor electronics, in communication with the transceiver electronics, configured to perform operations, the operations comprising;

operating the transceiver electronics to transmit a signal indicative of different portions of an identification sequence over different periods of time to a wireless device; and

operating the transceiver electronics to receive a hand-in request for a call associated with the wireless device, the hand-in request being generated in response to the transmitted signal; and

operating the transceiver electronics to provide wireless service for the call in response to the hand-in request.

30. The apparatus of claim 29, wherein operating the transceiver electronics to transmit the signal comprises operating the transceiver electronics to transmit two or more Pseudorandom Noise (PN) sequences in two or more different transmission frames, wherein the identification sequence comprises the two or more Pseudorandom Noise (PN) sequences.

31. The apparatus of claim 29, wherein operating the transceiver electronics to transmit the signal comprises operating the transceiver electronics to transmit the signal responsive to two or more Walsh codes modulated on a Pseudorandom Noise (PN) sequence, wherein the identification sequence comprises the two or more Walsh codes.

32. The apparatus of claim 29, the operations further comprising:

receiving a message that requests a transmission of the identification sequence;

wherein operating the transceiver electronics to transmit the signal comprises operating the transceiver electronics to transmit the signal in accordance with the received message.