The fourth-generation mobile phone network is a high-speed mobile network commonly used in the world in the mid-2010s. It can be divided into TDD-LTE (time-sharing long-term evolution technology) and FDD-LTE (frequency-division long-term evolution). Technology) and WiMAX (IEEE 802.16m); while TDD-LTE, FDD-LTE specifications have been unified instructure. The most important feature of the fourth-generation mobile phone network is the use of smartphones that can perform various Internet services online. The fourth generation of mobile phone technology uses the traditional traditional voice communication as a data packet to transmit, which is very different from the previous third generation network. Since the smartphone as the fourth-generation mobile network terminal is already functioning like a small computer, the fourth-generation mobile network is not so much a digital high-speed telephone communication network as it can be described as a base. A large Internet (Internet) service network that extends the range of use. In Taiwan, the fourth-generation digital mobile phone network began service in Western Singapore in 2014, and is the new generation of mobile Internet service for smartphones. It is expected to receive the communication bandwidth left after the removal of the second generation mobile phone network in 2017.


4.5G adopts LTE Advanced Pro, and its concept was first proposed by NOKIA at the end of 2014, and was confirmed by 3GPP as a new standard of LTE in October 2015. As the name suggests, 4.5G is a further technological evolution of LTE and LTE Advanced. It is also an important station for major network operators to enter 5G. 4.5G through aggregated carrier, 4x4 MIMO and 256 QAM technologies, network providers can provide The 4G network capacity and download speed of the service will be more and faster in the past, which will help solve problems such as network traffic jams.


4.5G is the way to prepare the 5G server in Hong Kong. 4.5G provided by Huawei in some company which support the 4.5G signal. Moreover, there are not many smartphone can reach the required of 4.5G. However, compare the speed of data transmission between 4G & 4.5G. The result showed that the speed is similar but 4.5G more stable in the city. There are more benefits on the train or MTR station compare with the 4G service, the stability increased and speed also stronger than 4G.