Springer Science+Business Media
The rapid progress made in mobile device technologies has implied that the access network must volute and develops new strategies to satisfy the requirements of the users. Heterogeneous Network (HetNet) allows for a flexible deployment strategy and offers economically viable solutions to improve network scalability and indoor coverage. This emerging topic has caught the attention of the research community and the industry because of the importance of these networks to satisfy the demand of data services. To provide this demand, different parameters of Quality of Service (QoS) must be satisfied. In this paper, they present a study on recent advances and open research issues on Mobility Protocols in conjunction with Multi-Protocol Label Switching (MPLS)-based Packet Transport Network (PTN) to provide QoS in wireless heterogeneous networks.