Method and apparatus for avoiding self-interference in a mobile network

A method for reducing interference in a mobile network in which a node A is to establish a proposed wireless link with node B, said method comprising, operating node A to:

• (a) identify a possible node E to node D link on a frequency of the proposed link;
• (b) identify other possible links that might impinge on node D;
• (c) using a computer to determine a sum of interference from all identified possibly impinging links weaker that the proposed link at node D, plus the proposed link interference;
• and
• (d) prohibit the proposed link depending upon a determined carrier-to-interference ratio for the node E to node D link;
• (e) operating node A to identify other possible node E to node D links on a frequency of the proposed link and to iterate operations (a), (b), (c) and (d) for each node E to node D link until either all node E to node D links are considered or the proposed link is prohibited;
• and
• if the proposed link is not prohibited, further comprising operating node A to send a request to node B to establish the proposed link, and operating node B to:
• receive the request from node A;
• determine interference to a node C to node B link from other possible interfering links;
• rank determined interfering links of the other possible interfering links in order of potential interference;
• sum interference to the node C to node B link from the node A to node B link and all determined interfering links providing less interference than the node A to node B link;
• and
• reject the node A to node B link depending upon whether or not the summed interference is greater than a node C to node B interference limit.

A wireless mobile network having mobile nodes, said network including a node A, a node B, at least one node E and at least one node D, and wherein node A is configured to:

• (a) determine a node E that transmits on a frequency equal to a frequency of a proposed link between node A and node B and which can transmit to a node D;
• (b) determine an effective gain of an antenna on node D with respect to interference from the proposed link between node A and node B, assuming an X-percentile beam criterion selected in accordance with a desired self-interference limit;
• (c) estimate a carrier intensity arriving at node D from node E;
• (d) determine a ratio of node E to node D carrier-to-potential-interference from the proposed link between node A and node B;
• and
• (e) condition establishment of the proposed link between node A and node B upon said determined ratio.

A wireless mobile network having mobile nodes, said network including a node A, a node B, at least one node D and at least one node E, and wherein node A is configured to:

• (a) identify a possible node E to node D link on a frequency of the proposed link;
• (b) identify other possible links that might impinge on node D;
• (c) use a computer to determine a sum of interference from all identified, possibly impinging links weaker that the proposed link at node D, plus the proposed link interference;
• and
• (d) prohibit the proposed link depending upon a determined carrier-to-interference ratio for the node E to node D link.
• node A is being configured to identify other possible node E to node D links on a frequency of the proposed link and to iterate (a), (b), (c) and (d) for each node E to node D link until either all node E to node D links are considered or the proposed link is prohibited;
• and
• at least one node C and wherein node A is configured to send a request to node B to establish the proposed link when the proposed link is not prohibited;
• and node B is configured to:
• receive the request from node A;
• determine interference to a node C to node B link from every other possibly interfering link;
• rank determined interfering links of the other possibly interfering links in order of potential interference;
• sum interference to the node C to node B link from the node A to node B link and all determined interfering links providing less interference than the node A to node B link;
• and
• reject the node A to node B link depending upon whether or not the summed interference is greater than a node C to node B interference limit.

A method for forming a “node A” for use in a wireless mobile network, said node A operating to:

• (a) determine a node E that transmits on a frequency equal to a frequency of a proposed link between node A and a node B and which can transmit to a node D;
• (b) determine an effective gain of an antenna on node D with respect to interference from the proposed link between node A and node B, assuming an X-percentile beam criterion selected in accordance with a desired self-interference limit;
• (c) estimate a carrier intensity arriving at node D from node E;
• (d) determine a ratio of node E to node D carrier-to-potential-interference from node A;
• and
• (e) condition establishment of the proposed link between node A and node B upon said determined ratio.

A method for operating a “node A” for use in a wireless mobile network, comprising:

• using said node A to:
• (a) identify a node E to a node D link on a frequency of a proposed link;
• (b) identify other possible links that might impinge on node D;
• (c) use a computer to determine a sum of interference from all identified, possibly impinging links weaker than the proposed link at node D, plus the proposed link interference;
• and
• (d) prohibit the proposed link depending upon a determined carrier-to-interference ratio for the node E to node D link;
• and
• (e) to prohibit the proposed link depending upon a determined carrier-to-interference ratio for the node E to node D link, node A is configured to determine whether the proposed node A to node B link by itself would not exceed an interference limit for the node E to node D link, and, if so, node A is configured to send a message to at least one of node D or node E to determine whether a node E to node D link exists, and node A is further configured to additionally condition prohibiting the proposed link upon whether the node E to node D link exists.