Even providing several benefits and facilities with regard to teaching and learning, mobile learning environments present problems and challenges that must be investigated, especially with respect to the definition and standardization of architectural aspects. Most of these environments are still built in isolation, with particular structures and architectures, hindering aspects such as reuse and interoperability, for instance. On the other hand, several initiatives of using service orientation aspects to support and help the architectural definition of software systems have been investigated. Motivated by this scenario, in this paper we propose a set of architectural requirements for service-oriented mobile learning environments. The architectural requirements are defined by means of a systematic process, being prioritized and complemented with the help of domain experts. In the very end, the main goal is to provide an adequate support for the architectural design of mobile learning environments, promoting quality, interoperability, reuse and reduction of the time spent in the development of such environments. [For the complete proceedings, see ED557171.]