Read the following context and choose the best option to answer the question.
Context: Cross - Layer Adaptive Feedback Scheduling of Wireless Control Systems . ( arXiv:0809.4924v1 [ cs . NI ] ) There is a trend towards using wireless technologies in networked control systems . However , the adverse properties of the radio channels make it difficult to design and implement control systems in wireless environments .
Question: What may be the purpose of the post ?
Options: 
- to give a user review
 - To describe technology
 - to give tech support
 - None of the above choices .


To describe technology