The two-user interference channel with limited cooperation under finite precision CSIT has sum-GDoF exactly equal to a min of four linear bounds, so each bit of cooperation buys 0, 1, 1/2, or 1/3 over-the-air bits.
Channels with cooperation links that may be absent,
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GDoF of Interference Channel with Limited Cooperation under Finite Precision CSIT
The two-user interference channel with limited cooperation under finite precision CSIT has sum-GDoF exactly equal to a min of four linear bounds, so each bit of cooperation buys 0, 1, 1/2, or 1/3 over-the-air bits.