## 2 Background of Immune Game Theory  
### Artificial Immune Theory  
Two theories are associated with artificial immunity: _self/tonself_ (SNS) and danger theory (DT).  
(1) SNS theory  
In 1994, [PERSON] proposed the SNS theory [15], which strictly divides cells and molecules in the immune body into their own cells and allogeneic cell molecules, including foreign viruses, bacteria, and mutated cells. All cell molecules can be defined as a collection \(U\), consisting of a set \(N\) of viruses, bacteria, and mutated cells from the outside world, and a set \(S\) of their own cells, satisfying  
\[S\cap N=\varnothing,S\cup N=U \tag{1}\]  
In the SNS mode, antibody cells in the body judge between the cells. Once the antibody cells judge a cell as a foreign cell, the corresponding elimination process will be carried out. On the contrary, if all antibody cells do not match the cell, it is judged to be an autologous cell. According to the above analysis, the SNS theory of self-body and allogeneic cells should satisfy formula (2). Let \(f\) be a binary classification function of, and define \(Ab\) as an antibody set gained by constantly learning access data in the mechanism of the immune system. If \(u\) is set to a conventional value, i.e., u\(\in\)U, then  
\[f(Ab,u)=\left\{\begin{array}{c}u\in N,\;when\;Ab\;mathes\;u\\ u\in S,\;others\end{array}\right.\] (2) DT theory was first proposed by [PERSON] in 1994 [16]. The theory holds that the immune system produces the corresponding protective mechanism according to the sensitivity of the danger signal. Immune response is a response to the process of cell death. The generation and detection of danger signals are closely related to immune biochemical reactions [17].  
As shown in Figure 2 dendritic cell (DC) in the biological immune system is an antigen-presenting cell that ingests antigens in tissues and presents antigen fragments. Immature dendritic cells (DCs) receive both safe and dangerous signals from the environment wherein antigens are present. Then, it divides into mature and semi-mature cells. The proportion of mature antigens to total antigens ultimately determines whether there is a danger.  
The DT theory states that the immune system of a living organism does not distinguish all antigens as either self or foreign. In contrast, the theory of immune risk states that the immune system only responds to harmful antigens, which greatly reduces the scale of response and makes it more practical. In addition, the immune risk theory and the traditional artificial immunity theory can also recognize and immunize the mutated antigens by updating the antibody library.  
DT theory holds that damaged, apoptosis, and abnormal death cells caused by an antigen attack will transmit a red flag to antigen-presenting cells (APCs), which will create a hazardous area. At the same time, antibodies that match the danger area are activated and cloned for secondary immunity. The immune process is shown in Figure 3.  
SNS theory divides matter into auto and foreign bodies, so abnormal detection requires the production of antibodies that match all foreign bodies, i.e., detectors. To cover all foreign antigens, the system requires a large number of detectors. In contrast, DT theory divides antigen substances into harmful and harmless antigens; hence measures will only be taken against antigens that may be dangerous to the body. For example, no response will be produced against food that is ingested.  
In view of the huge, multi-source characteristics of mobile multimedia network data, the immune principle adopted in this paper is based on DT theory, and only the harmful  
Figure 3: Immune process.  
Figure 2: Danger theory of immune system.  
antigens are immunized, which can effectively reduce resource consumption and save computation time. It ensures data security and communication fluency of network nodes.