neering Task Force (IETF) and elsewhere. Current research challenges in ICN include naming, security, routing, system scalability, mobility management, wire- less networking, transport services, in-network caching, and network management. lxxx Introduction and Background enhancements to user data rates and system capacity with full-dimension MIMO (FD- MIMO), improved support for unlicensed operations [47], and latency reduction in both control and user planes. The enhancements in LTE Rel-14 and Rel-15 are also intended to provide better support for use cases such as massive MTC, mission-critical communications, and intelligent transportation systems. The MIMO enhancement in 3GPP makes it possible to dynamically adapt the transmission both vertically and horizontally by steering a two- dimensional antenna array. The concept of FD-MIMO in the current LTE releases builds on the channel state information feedback mechanisms introduced in LTE Rel-13, in which precoding matrix codebooks support two-dimensional port layouts with up to 16 antenna ports. To enhance both non-precoded and beamformed CSI-RS operation, LTE Rel-14 intro- duced several new features, including hybrid non-precoded/beamformed CSI mode with optimized feedback; aperiodic triggering of CSI-RS measurements and support for up to 32 antenna ports. Other 3GPP work items include uplink enhancements such as higher order modulation and coding (e.g., 256QAM in the uplink) in baseline LTE systems. While it is theoretically possible to increase uplink peak data rates with improvements such as this in small-cell deployments, commercially available mobile devices are almost invariably use modulation orders limited to 16QAM in the uplink due to practical constraints. The ability to combine unlicensed spectrum with licensed spectrum is a highly attractive opportunity for network operators. This can be achieved by LTE-WLAN link aggregation and/or by carrier aggregation of LTE in both licensed and unlicensed bands through licensed-assisted access. These features are