Minimization of channel filters within wireless access nodes

• US 8,036,130 B2
• Filed: 03/04/2008
• Issued: 10/11/2011
• Est. Priority Date: 04/08/2004
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited (Hitachi, Ltd.)
• Original Assignee: Tropos Networks Incorporated (ABB Limited)
• Inventors: Behroozi, Cyrus
• Primary Examiner(s): Chou; Albert T
• Application Number:
  US12/074,427
• Publication Number:
  US 20080151816A1
• Time in Patent Office: 1,316 Days
• Field of Search: 370/238, 370/338, 455/445
• US Class Current: 370/238
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04W 40/12 based on transmission quality or channel quality

Abstract

A wireless access node includes a first radio operable to transmit/receive on one of at least N transmission channels. A second radio is operable to transmit/receive on another one of the at least N transmission channels. A first filter bank, of less than N filters, filters a first transmit/receive signal of the first radio. A second filter bank, of less than N filters, filters a second transmit/receive signal of the second radio. Generally, N is greater than 2.

Claims

1. A wireless access node comprising:

a first radio operable to transmit/receive on one of at least N transmission channels;

a second radio operable to transmit/receive on another one of the at least N transmission channels, wherein N is greater than 2;

a first filter bank of less than N filters for filtering a first transmit/receive signal of the first radio; and

a second filter bank of at least 2 but less than N filters for filtering a second transmit/receive signal of the second radio, at least one of the pass-bands of the second filter bank being different than the pass-bands of the first filter bank;

wherein N is greater than 2, and wherein the combination of the first radio and the second radio are operable to transmit/receive on all N transmission channels;

wherein the access node is in communication with a first device and a second device, the first radio being in communication with the first device, and the second radio being in communication with the second device; and

wherein the communication of the access node to the first device and the second device is reversible so that the first radio is in communication with the second device and the second radio is in communication with the first device.

2. The wireless access node of claim 1, wherein the access node is within a mesh network, and the first radio is in communication with at least one of the first device and the second device depending upon a selected mesh network routing.

3. A method of routing information through at least one access node of a mesh network, comprising:

selecting a routing path between a client and a gateway;

selecting a transmission channel for each hop of the selected routing path;

selecting an upstream versus downstream orientation of at least one access node within the selected routing path, wherein the orientation of at least one access node is able to rotate;

selecting channel filtering within the at least one access node within the selected routing path, comprising;

selecting a first filter bank of at least 2 but less than N filters for filtering a first transmit/receive signal of a first radio; and

selecting a second filter bank of at least 2 but less than N filters for filtering a second transmit/receive signal of a second radio, at least one of the pass-bands of the second filter bank being different than the pass-bands of the first filter bank;

wherein N is greater than 2, and wherein the combination of the first radio and the second radio are operable to transmit/receive on all N transmission channels.

4. The method of claim 3, wherein selecting a routing path comprises determining the routing path that provides a maximal throughput.

5. The method of claim 3, wherein selecting a transmission channel for each hop of the selected routing path comprises selecting each transmission channel for minimizing interference.

6. The method of claim 3, wherein the orientation is selected based upon filters available to the radios within the access node.

7. The method of claim 3, wherein selecting channel filtering within the at least one access node within the selected routing path comprises selecting the first filter bank within the first radio of at least one access node that is complementary with the second filter bank within the second radio of the access node.