<s>
Augmented	B-Protocol
tree-based	I-Protocol
routing	I-Protocol
(	O
ATR	O
)	O
protocol	O
,	O
first	O
proposed	O
in	O
2007	O
,	O
is	O
a	O
multi-path	O
DHT-based	O
routing	O
protocol	O
for	O
scalable	B-Architecture
networks	O
.	O
</s>
<s>
ATR	O
resorts	O
to	O
an	O
augmented	O
tree-based	O
address	B-General_Concept
space	I-General_Concept
structure	O
and	O
a	O
hierarchical	O
multi-path	O
routing	O
protocol	O
in	O
order	O
to	O
gain	O
scalability	B-Architecture
and	O
good	O
resilience	O
against	O
node	B-Protocol
failure/mobility	O
and	O
link	O
congestion/instability	O
.	O
</s>
