S1
D1
S2
D2
D1
S2
D2
…
…
SK
…
S1
DK
S1
D1
S2
D2
S1
D1
SR
S2
D2
2 user IC
K-user IC
2 user cognitive IC
Weak interference
Moderate
interference
Strong interference
Treating
interference as noise
Rate splitting
(within one bit)
Jointly decoding
Lattice coding
(very strong)
Unknown
Gel’fand-Pinsker
coding
2 user IC with a
cognitive relay
Unknown
3 user IC with a
cognitive transmitter
Unknown
Unknown
Superposition coding
with jointly decoding
Superposition coding
with jointly decoding
2 user IC
K-user IC
2 user cognitive IC
Weak interference
Moderate
interference
Strong interference
Treating
interference as noise
Rate splitting
(within one bit)
Jointly decoding
Lattice coding
(very strong)
Unknown
Gel’fand-Pinsker
coding
Unknown
Superposition coding
with jointly decoding
2 user IC with a
cognitive relay
Unknown
Superposition coding
with jointly decoding
3 user IC with a
cognitive transmitter
Unknown
Our work
Inner Bound
Four channel
conditions
=
Four channel
conditions
Outer bound
Capacity region
with 8 channel
conditions
S3 → Dk: strong
Sk → Dl: strong
Sk → D3: strong
S3 → Dk: strong
Sk → Dl: strong
Sk → D3: strong
Weak
Strong