4G LTE and 4G LTE Advanced (LTE-A) represent two stages in the evolution of 4G technology, with LTE Advanced offering significant improvements over the original LTE (Long-Term Evolution) standards.
Overall, LTE Advanced represents a significant advancement over LTE, offering higher speeds, more efficient use of spectrum, and better network performance. These improvements make LTE-A better suited to meet the increasing demands for mobile data and the growing number of connected devices.
Higher Speeds: LTE Advanced provides considerably higher peak data rates, with potential speeds up to several Gbps for stationary or pedestrian users and 100 Mbps for users in high mobility environments (e.g., cars and trains). In contrast, standard LTE offers peak download speeds of up to 300 Mbps. (NOTE : The highest data rate that I personally confirmed was 2Gbps downlink throughput, but it can be much higher based on 3GPP depending on MIMO and Carrier Aggregation scheme)
Carrier Aggregation (CA): LTE-A introduces carrier aggregation, a technology that allows the combination of multiple LTE carriers (up to five 20 MHz carriers, for a total of up to 100 MHz) into a single data stream. This significantly increases bandwidth and speeds compared to LTE, which typically operates on single carriers up to 20 MHz wide.
Improved MIMO Capabilities: LTE Advanced supports up to 8x8 MIMO (Multiple Input Multiple Output) in the downlink and 4x4 MIMO in the uplink, enhancing data rates and network capacity. Original LTE standards support up to 4x4 MIMO in the downlink and 1x2 or 2x2 in the uplink.
Enhanced Use of Heterogeneous Networks (HetNets): LTE-A improves the performance and integration of HetNets, which include a mix of macrocells, picocells, femtocells, and relay nodes. This leads to better coverage, especially in densely populated areas, and more efficient use of spectrum and network resources.
Coordinated Multi-Point Operation (CoMP): LTE-A introduces CoMP to improve the network's efficiency in dealing with interference, especially at cell edges. This enhances user experience by improving data rates and reducing latency for users in challenging environments.