Social-Aware Edge Caching Strategy of Video Resources in 5G Ultra-Dense Network

Algorithm 1

Aggregation Process of users.

	1: /∗ is user set; is set of user groups;
2: and are empty sets∗/;
3: for (; ¡++)
4:    is added into ;
5:   for (; ¡++)
6:    if has same domain with
7:      is added into ;
8:    end if
9:   end for
10:  if
11:    is removed from and is added into ;
12:  else items in are removed from ;
13:    is added into ;
14:  end if
15:   is set to empty set;
16: end for
17: all items in are added into ;
18: if is not
19:  if is
20:   for (; ¡++)
21:     is a group and is added into ;
22:   end for
23: else for (; ¡++)
24:    computes similarity values between and all centric items in ;
25:    if centric item of subset has the largest similarity with
26:      is added into ;
27:    end if
28:   end for
29:  end if
30: end if