# Time Segmentation-Based Hybrid Caching in 5G-ICN Bearer Network
## 2 Related Work  
### 5G-ICN Network  
ICN is an emerging paradigm in which data or content is assigned a name. Unlike IP-based networks, ICN networks retrieve data/content without knowing the physical location of the content provider. Several ICN architectures have been proposed, such as DONA [5], NDN [6], PURSUIT [7], and NetInf [8]. For research on the integration of ICNand 5G, in addition to the 5G-ICN architecture proposed in paper [1], paper [9] presents an extension of the 5G core (5 GC) control and user planes to support protocol data unit (PDU) sessions from endpoints in ICN. The paper [10] proposes that the fusion of the ICN paradigm and MEC brings new opportunities and challenges for realizing the 5G vision and beyond the 5G system. The paper [11] proposes the great potential of ICN for 5G mobile edge computing (MEC), software-defined networking (SDN), and network function virtualization (NFV). Among other things, it summarizes content naming schemes and content caching schemes. The paper [12] points out that the current content caching strategy (CCS) in ICN is not suitable for the 5G-ICN architecture and proposes an improved optimization scheme. In the 5G-ICN research, the Internet Research Task Force (IRTF) [3] pointed out the new data-centric architecture of the ICN network and its network capabilities, such as in-network caching and multicast. These capabilities are an effective solution to the needs of 5G. In this architecture, PDU coexists in the dual-stack mode of ICN and IP and is combined according to the ICN and IP protocol of PDU and network facilities. IRTF pointed out that the current network architecture can adopt different deployment implementations such as IPoIP, ICNoIP, IPoICN, and ICNoICN. Table 1 summarizes how these four deployments work and the pros and cons of each. Table 1 shows that the ICNoIP deployment method is the most suitable for the current principles of minimum cost and optimal effect. For improving the deployment method of ICNoIP, the ICN network that solves the 5G requirements can be sunk under the user plane function. [13; 14] both try to use ICN-enabled forwarding equipment between the base station (gNB) and the core network, while [15; 16] enable ICN and adopt device-to-device (D2D) communication in 5G. However, due to the limited resources of mobile devices, edge caching also needs to be considered to balance the load on mobile devices. In the converged architecture proposed by IRTF above, the working group considered three possible 5G-ICN deployment scenarios, all of which were discussed with reference to the Long Term Evolution (LTE) architecture. The first is the coverage model. On the premise \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Deployment Method** & **Work Method** & **Advantage** & **Disadvantage** \\ \hline \hline \multirow{4}{*}{IPoIP} & Existing traditional methods & Use the existing framework system & Uncertainty of business and traffic; difficult to guarantee user experience; more complicated network operation and maintenance \\  & & & \\ \hline \multirow{4}{*}{ICNoIP} & The business system newly adopts the ICN method, which can inherit the existing infrastructure & Effectively improve performance in terms of bandwidth, delay, synchronization, and reliability; strong practicability & Different network connections need to be solved by specific gateways \\ \hline \multirow{4}{*}{IPoICN} & The business system follows the existing IP protocol system and builds a new ICN infrastructure & High compatibility of business systems & High cost; weak practicability \\ \hline \multirow{4}{*}{ICNoICN} & Both business systems and infrastructure are ICN protocol systems & High efficiency; completely solve the limitations of traditional IP networks & High cost; poor compatibility; weak practicability \\ \cline{1-1}  & Both business systems and infrastructure are ICN protocol systems & High efficiency; completely solve the limitations of traditional IP networks & High cost; poor compatibility; weak practicability \\ \hline \hline \end{tabular}
\end{table}