# The Broadcast Channel with Degraded Message Sets and Unreliable Conference

## TL;DR

This paper investigates the capacity of broadcast channels with degraded message sets and unreliable cooperation links, proposing coding schemes that adapt to the presence or absence of cooperation in dynamic communication environments.

## Contribution

It introduces a capacity region characterization for broadcast channels with degraded message sets under uncertain cooperation link availability.

## Key findings

- Derived the capacity region for channels with unreliable cooperation links.
- Proposed coding schemes that adapt to link presence or absence.
- Enhanced understanding of communication performance under link uncertainty.

## Abstract

As demonstrated in many recent studies, cooperation between users can greatly improve the performance of communication systems. Most of the works in the literature present models where all the users are aware of the resources available for cooperation. However, the scenario where cooperation links are sometimes unavailable or that some users cannot be updated whether the cooperation links are present or not, is more realistic in today's dynamic ad-hoc communication systems. In such a case we need coding schemes that exploit the cooperation links if they are present, and can still operate if cooperation is not possible. In this work we study the general broadcast channel model with degraded message sets and cooperation links that may be absent, and derive it's capacity region under such uncertainty conditions.