Method of interference management for interference/collision prevention/avoidance and spatial reuse enhancement
First Claim
1. A collision prevention method for coordinating medium access among a plurality of nodes according to claim 1 of the parent application (i.e., the U.S. patent application Ser. No. 10/881,414 filed on 2004 Jun. 30) wherein option (d) an interference/sensing-based signaling approach is employed, comprising the following steps:
- (d.1) a node transmitting intermittent signal(s) in a channel the same as or different from that of associated data;
(d.2) other nearby nodes sensing the channel to understand the conveyed information or instructions according to the pattern of the signals, using information including, but not limited to, the timing, length, and/or power levels of the signals;
(d.3) nodes successfully sensing the signals optionally following the instructions and/or utilizing the conveyed information if there are any and the said nodes know the corresponding instructions and/or information, or simply reacting according to the protocol they are running;
thereby achieving desired purposes such as avoiding collision of an associated reception while other nearby nodes are running other coexisting MAC approaches;
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Abstract
Interference, collisions, power control, and spatial reuse constitute important issues that need to be resolved urgently in multihop wireless networks such as ad hoc networks, single-hop/multihop wireless LANs, sensor networks, and mesh networks. A method called the evolvable interference management (EIM) method is disclosed in this patent for avoiding/preventing interference and collision and increasing network throughput and energy efficiency in wireless networks. EIM employs sensitive CSMA/CA, patching approaches, interference engineering, differentiated multichannel, detached dialogues, and/or spread spectrum techniques to solve the interference and QoS problems. Also, EIM embodiments based on collision prevention without dialogues are capable of collision reduction/control and can resolve several important problems encountered in previous MACP or RTS/CTS-based protocols, while improving/retaining their important advantages.
530 Citations
24 Claims
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1. A collision prevention method for coordinating medium access among a plurality of nodes according to claim 1 of the parent application (i.e., the U.S. patent application Ser. No. 10/881,414 filed on 2004 Jun. 30) wherein option (d) an interference/sensing-based signaling approach is employed, comprising the following steps:
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(d.1) a node transmitting intermittent signal(s) in a channel the same as or different from that of associated data; (d.2) other nearby nodes sensing the channel to understand the conveyed information or instructions according to the pattern of the signals, using information including, but not limited to, the timing, length, and/or power levels of the signals; (d.3) nodes successfully sensing the signals optionally following the instructions and/or utilizing the conveyed information if there are any and the said nodes know the corresponding instructions and/or information, or simply reacting according to the protocol they are running;
thereby achieving desired purposes such as avoiding collision of an associated reception while other nearby nodes are running other coexisting MAC approaches; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 24)
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- 20. A coding technique for representing a numerical value, wherein a codeword is changed to a non-codeword when none of its 1-bits are changed to 0 and at least one 0-bit is changed to 1.
Specification