Method for channel state measurement in multi-mode multi-hop wireless networks

摘要

The invention concerns a method for measuring channel state information of multiple transmission/reception modes in a wireless network comprising a plurality of nodes, said modes being defined by frequency channels and/or antenna patterns, said wireless network comprising a MAC (Media Access Control) layer and every node comprising at least one MAC queue, comprising the steps of:periodically sending broadcast probe packets by at least one node called transmitter node, using a pre-determined and globally known period and predetermined sequence of transmission modes, each of said probe packets containing the transmission mode used for its transmission a sequence number of the transmission mode in the pre-determined sequence of transmission modes and a timestamp value containing the time said broadcast probe packet was buffered at the MAC queue of the transmitter node; measuring, by at least one second node called receiving node receiving a broadcast probe packet , channel state information of a transmission/reception mode for the link between the transmitter node and the receiving node; storing, by said receiving node, said measured transmission/reception mode for said link; using information contained in said received broadcast probe packet, by said receiving node to determine its reception mode and the beginning and end time instants it will use this reception mode, in order to receive a further broadcast probe packet and measure the next transmission mode of transmitter node, during a next measurement period of transmitter node.

主权项

1. A method for measuring channel state information of multiple communication modes in a multi-mode wireless network comprising a plurality of nodes, the method comprising:
receiving a broadcast probe packet during a measurement period at a first node of said plurality of nodes from a second node of said plurality of nodes using a period and sequence of communication modes, wherein a communication mode is related to a transmission mode or a reception mode for a node of said plurality of nodes and is defined by at least a frequency channel and an antenna pattern, and wherein said broadcast probe packet comprises information including:
(i) an identification of a particular communication mode used for transmission of the broadcast probe packet from the second node;(ii) a sequence number of the particular communication mode in the sequence of communication modes; and(iii) a timestamp value representing a time at which said broadcast probe packet was buffered at a MAC queue included in the second node; measuring, by the first node, channel state information for communication mode used in connecting the second node and the first node; storing, by said first node, said measured channel state information for the communication mode used in connecting the first and second nodes; determining, by said first node, the communication mode for the first node using said information in said received broadcast probe packet; and determining a time during which said first node will use the determined communication mode in order to receive a subsequent broadcast probe packet from said second node during a next measurement period of said second node using said timestamp value from said received broadcast probe packet.