Wireless telecommunicatons network

• US 9,048,981 B2
• Filed: 11/19/2008
• Issued: 06/02/2015
• Est. Priority Date: 07/31/2008
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Touboul, Assaf, Barak, Oz
• Primary Examiner(s): Zhao, Wei
• Assistant Examiner(s): Morlan, Robert M
• Application Number:
  US12/273,572
• Publication Number:
  US 20100027694A1
• Time in Patent Office: 2,386 Days
• Field of Search: 370/310, 370/315, 370/328, 370/329, 370/350, 370/503
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0093 Neighbour cell search
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation

Abstract

A femtocell including a transceiver and a processor coupled to the transceiver for implementing transmission and reception in a wireless communication network utilizing OFDM/OFDMA, and the processor including modules for collecting information about neighboring base stations and femtocells and utilizing the collected information to select the femtocell'"'"'s own radio parameters, and a method for radio resource allocation in a wireless communication network implementing OFDM/OFDMA, the method including performing preamble synchronization by a sniffing femtocell on a neighboring femtocell, and determining radio resource parameters of the neighboring femtocell based on the synchronized preamble.

Claims

1. A sniffing femtocell comprising:

means for synchronizing the sniffing femtocell on a preamble transmitted by a neighboring femtocell over a wireless communication network;

means for determining radio and physical layer parameters of said neighboring femtocell based on said preamble and a measurement of signals received over a frequency allocated to said neighboring femtocell during a frame of said sniffing femtocell, wherein;

said frame is divided into a downlink subframe and an uplink subframe,

said measurement is during said downlink subframe,

said downlink subframe comprises a preamble portion, a control channel portion, and an empty data portion,

said parameters of said neighboring femtocell comprise a sector ID, and

said received signals comprise a data carrier detect;

means for determining a direction of arrival of said received signals;

means for generating an RF spatial map based on said direction of arrival of said received signals, said RF spatial map comprising a location of said neighboring femtocell and said parameters of said neighboring femtocell; and

means for selecting radio and physical layer parameters for said sniffing femtocell based on said RF spatial map, said radio and physical layer parameters selected for said sniffing femtocell comprising at least a sector ID, a beam direction, or a combination thereof, in said wireless communication network for said sniffing femtocell.

2. The sniffing femtocell according to claim 1, wherein said radio and physical layer parameters selected for said sniffing femtocell comprise at least a channel selection.

3. The sniffing femtocell according to claim 1, wherein said means for selecting comprises:

means for detecting, in said sniffing femtocell, said preamble from said neighboring femtocell in said network for synchronization;

means for determining, in said sniffing femtocell, a received signal strength indication (RSSI) and CINR (carrier to interference and noise ratio) from said preamble; and

means for implementing radio resource and physical layer allocation by said sniffing femtocell in accordance with said determined radio and physical layer parameters.

4. The sniffing femtocell according to claim 1, wherein said means for selecting comprises:

means for updating a neighboring femtocell parameter database in said sniffing femtocell;

means for performing network entry by said sniffing femtocell said neighboring femtocell;

means for requesting said radio and physical layer parameters from said neighboring femtocell; and

means for receiving and implementing radio and physical layer configuration parameters by said sniffing femtocell.

5. The sniffing femtocell according to claim 4, wherein said means for requesting said radio and physical layer configuration parameters from said neighboring femtocell comprises:

means for receiving said requested radio and physical layer configuration parameters from a central service through said neighboring femtocell.

6. The sniffing femtocell according to claim 5, further comprising:

means for communicating with said central service over a backhaul channel allocated for said sniffing femtocell at said neighboring femtocell.

7. The sniffing femtocell according to claim 1, wherein said means for selecting comprises:

means for updating a neighboring femtocell parameter database in said sniffing femtocell;

means for performing network entry by said sniffing femtocell to said neighboring femtocell;

means for requesting a neighboring femtocell list from said neighboring femtocell; and

means for selecting configuration parameters by said sniffing femtocell according to said neighboring femtocell list.

8. The sniffing femtocell according to claim 7, wherein said neighboring femtocell list identifies a set of the neighboring femtocells comprising configuration parameters available for use by said sniffing femtocell.

9. The sniffing femtocell according to claim 1, wherein said radio and physical layer parameters comprise at least one of:

a segment parameter, a frequency parameter, or a transmission power.

10. A sniffing femtocell comprising:

a base station transceiver having at least one receive antenna; and

a baseband processor coupled to said transceiver for implementing transmission and reception in a wireless communication network, said baseband processor configured to;

synchronize said sniffing femtocell on a preamble transmitted by a neighboring femtocell;

determine radio and physical layer parameters of said neighboring femtocell based on said preamble and a measurement of signals received over a frequency allocated to said neighboring femtocell during a frame of said sniffing femtocell, wherein;

said frame is divided into a downlink subframe and an uplink subframe,

said measurement is during said downlink subframe,

said downlink subframe comprises a preamble portion, a control channel portion, and an empty data portion,

said parameters of said neighboring femtocell comprise a sector ID, and

said received signals comprise a data carrier detect;

determine a direction of arrival of said received signals;

generate an RF spatial map based on said direction of arrival of said received signals, said RF spatial map comprising a location of said neighboring femtocell and said parameters of said neighboring femtocell; and

select, in said baseband processor, radio and physical layer parameters of said sniffing femtocell based on said RF spatial map, said physical layer parameters selected for said sniffing femtocell comprising at least a sector ID, a beam direction, or a combination thereof, in said wireless communication network for said sniffing femtocell.

11. A method for radio resource allocation of a sniffing femtocell in a wireless communication network, the method comprising:

synchronizing said sniffing femtocell on a preamble transmitted by a neighboring femtocell;

determining, in said sniffing femtocell, radio and physical layer parameters of said neighboring femtocell based on said preamble and a measurement of signals received over a frequency allocated to said neighboring femtocell during a frame of said sniffing femtocell, wherein;

said frame is divided into a downlink subframe and an uplink subframe,

said measurement is during said downlink subframe,

said downlink subframe comprises a preamble portion, a control channel portion, and an empty data portion,

said parameters of said neighboring femtocell comprise a sector ID, and

said received signals comprise a data carrier detect;

determining, in said sniffing femtocell, a direction of arrival of said received signals;

generating, in said sniffing femtocell, an RF spatial map based on said direction of arrival of said received signals, said RF spatial map comprising a location of said neighboring femtocell and said parameters of said neighboring femtocell; and

selecting, in said sniffing femtocell, radio and physical layer parameters of said sniffing femtocell based on said RF spatial map, said physical layer parameters selected for said sniffing femtocell comprising at least a sector ID, a beam direction, or a combination thereof, in said wireless communication network for said sniffing femtocell.

12. The method according to claim 11, wherein selecting said radio and physical layer parameters includes:

detecting, in said sniffing femtocell, said preamble from said neighboring femtocell in said network for synchronization;

determining, in said sniffing femtocell, a received signal strength indication (RSSI) and CINR (carrier to interference and noise ratio) from said preamble; and

implementing radio resource and physical layer allocation by said sniffing femtocell in accordance with said determined radio and physical layer parameters.

13. The method according to claim 11, wherein said selecting includes:

updating a neighboring femtocell parameter database in said sniffing femtocell;

performing network entry by said sniffing femtocell to said neighboring femtocell;

requesting said radio and physical layer parameters from said neighboring femtocell; and

receiving and implementing radio and physical layer configuration parameters by said sniffing femtocell.

14. The method according to claim 11, wherein said selecting includes:

updating a neighboring femtocell parameter database in said sniffing femtocell;

performing network entry by said sniffing femtocell to said neighboring femtocell;

requesting a neighboring femtocell list from said neighboring femtocell; and

selecting configuration parameters by said sniffing femtocell according to said neighboring femtocell list.

15. The method according to claim 11, wherein said radio and physical layer parameters comprise at least one of:

a segment parameter, a frequency parameter, or a transmission power.

16. The method according to claim 11, further comprising:

subscribing said sniffing femtocell to said neighboring femtocell.

17. The method according to claim 13, wherein requesting said radio and physical layer configuration parameters from said neighboring femtocell comprises:

requesting said requested radio and physical layer configuration parameters from a central service through said neighboring femtocell.

18. The method according to claim 17, further comprising:

receiving said requested radio and physical layer configuration parameters from said central service through said neighboring femtocell.

19. The method according to claim 17, further comprising:

communicating with said central service over a backhaul channel allocated for said sniffing femtocell at said neighboring femtocell.

20. The method according to claim 14, wherein said neighboring femtocell list identifies a set of neighboring femtocells comprising configuration parameters available for use by said sniffing femtocell.