ADAPTIVE TIME SLOT ALLOCATION TO REDUCE LATENCY AND POWER CONSUMPTION IN A TIME SLOTTED CHANNEL HOPPING WIRELESS COMMUNICATION NETWORK

摘要

Excessive latencies and power consumption are avoided when a large number of leaf nodes (LNs) contend simultaneously to join a time slotted channel hopping wireless communication network having a root node (RN) interfaced to LNs by one or more intermediate nodes (INs). A first plurality of shared transmit/receive slots (STRSs) is allocated for at least one IN, and a second plurality of STRSs is advertised for use by contending LNs, where the first plurality is larger than the second plurality. When a LN joins, its STRSs are re-defined such that most become shared transmit-only slots (STOSs) and no STRSs remain. The numbers of STRSs allocated to INs may vary inversely with their hop counts from the RN. One or more STOSs may be added for each of one or more INs in response to a predetermined network condition.

主权项

1. A method of allocating slots of time in a time slotted channel hopping (TSCH) wireless communication network that includes at least one intermediate node (IN) that interfaces between a root node (RN) and a plurality of leaf nodes (LNs), comprising:
allocating a first plurality of shared transmit/receive slots (STRSs) to an IN when the IN associates with the network; and advertising a second plurality of STRSs allocated as contention slots in which LNs may contend for association with the network; wherein the first plurality of STRSs is larger than the second plurality of STRSs.