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The 5G logical architecture is presented in detail, and key procedures for dynamic control plane instantiation, device attachment, and service request and mobility management are specified. Key feature of the proposed architecture is <jats:italic>flexibility<\/jats:italic>, needed to support efficiently a heterogeneous set of services, including Machine Type Communication, Vehicle to X and Internet of Things traffic. These applications are imposing challenging targets, in terms of end\u2010to\u2010end latency, dependability, reliability and scalability. Additionally, <jats:italic>backward compatibility<\/jats:italic> with legacy systems is guaranteed by the proposed solution, and Control Plane and Data Plane are <jats:italic>fully decoupled<\/jats:italic>. The <jats:italic>three levels of unified signaling<\/jats:italic> unify Access, Non\u2010access and Management strata, and a <jats:italic>clean\u2010slate forwarding layer<\/jats:italic>, designed according to the software defined networking principle, replaces tunneling protocols for carrier grade mobility. Copyright \u00a9 2014 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/ett.2915","type":"journal-article","created":{"date-parts":[[2014,12,9]],"date-time":"2014-12-09T02:37:27Z","timestamp":1418092647000},"page":"82-92","source":"Crossref","is-referenced-by-count":105,"title":["SDN\u2010based 5G mobile networks: architecture, functions, procedures and backward compatibility"],"prefix":"10.1002","volume":"26","author":[{"given":"R.","family":"Trivisonno","sequence":"first","affiliation":[{"name":"Huawei European Research Institute  Munich Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R.","family":"Guerzoni","sequence":"additional","affiliation":[{"name":"Huawei European Research Institute  Munich Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"I.","family":"Vaishnavi","sequence":"additional","affiliation":[{"name":"Huawei European Research Institute  Munich Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D.","family":"Soldani","sequence":"additional","affiliation":[{"name":"Huawei European Research Institute  Munich Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2014,12,5]]},"reference":[{"key":"e_1_2_7_2_1","unstructured":"METIS.Scenario requirements and KPIs for 5G mobile and wirelss system. 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