(c) Transitions in traffic passing over the Internet in Japan

We estimated the total download traffic by broadband service subscribers in Japan from A1 — the traffic of ISP5 broadband service subscribers (DSL, FTTH, etc.) — and the percentage of ISP5 subscriptions among all broadband subscriptions in Japan. This estimate found that an average of approximately 5.4 Tbps of traffic passed over the Internet during November 2015. This was a 52.8 percent increase from the same month one year ago, continuing the increase in traffic over the Internet (Figure 5-2-2-7).

Figure 5-2-2-6 Transitions in subscriptions to MVNO services (excluding MVNOs that are MNO)

Prepared from “Announcement of Quarterly Data on Telecommunication Service Contracts and Market Shares (4Q of FY 2015 (March 31, 2016)),” MIC

Figure 5-2-2-7 Tabulations and estimates of Internet traffic in Japan

Traffic tabulations and estimates

Year	Month	Total traffic by broadband service subscribers in Japan (estimated) [Gbps]	Traffic per broadband service subscriber (estimated) [kbps]	(A1) Traffic by broadband service subscribers (DSL, FTTH, etc.) [Gbps]	(A2) Traffic by other subscribers (leased lines, data centers, etc.) [Gbps]	(B1) Traffic exchanged between major domestic IXs and ISP5 [Gbps]	(B2) Traffic exchanged between domestic ISPs and ISP5 without passing through major domestic IXs [Gbps]	(B3) Traffic exchanged between overseas ISPs and ISP5 [Gbps]	(X) ISP5 share (calculated from subscription numbers)
In	out	In	out	In	out	In	out	In	out	In	out	In	out
2011	May	693	1516	20.2	44.1	302.5	662.0	193.9	174.4	98.4	90.0	242.9	131.5	420.9	160.5	43.67%
November	640	1600	18.4	46.0	281.1	702.3	221.9	207.5	102.9	89.4	265.1	139.1	498.5	169.6	43.89%
2012	May	658	1730	18.8	49.3	287.8	756.6	251.5	243.0	118.4	98.6	317.4	145.1	528.7	178.8	43.74%
November	666	1905	18.9	54.0	294.0	840.3	268.3	257.2	103.2	83.2	316.6	135.7	517.3	201.6	44.12%
2013	May	770	2275	21.7	64.2	347.8	1027.8	300.3	286.4	114.5	85.5	423.3	161.3	633.9	231.6	45.18%
November	834	2584	23.3	72.3	370.0	1146.3	336.5	326.2	138.9	94.9	520.8	186.2	714.5	259.7	44.36%
2014	May	905	2892	25.2	80.4	398.9	1274.5	359.2	317.2	163.6	101.5	614.9	214.3	808.3	282.3	44.07%
November	99	3549	25.7	98.1	407.6	1557.0	496.1	426.1	192.3	104.6	765.1	246.5	924.6	340.6	43.83%
2015	May	1086	4582	29.3	123.5	457.0	1928.9	525.6	440.2	198.9	117.5	955.6	287.5	941.5	308.1	42.10%
November	1051	5423	27.9	144.1	452.9	2336.1	581.1	503.0	251.9	137.1	1306.4	366.6	1059.7	307.9	43.08%

(Notes) ISP5 is the total for five cooperating ISPs, namely the Internet Initiative Japan (IIJ), NTT Communications, K-Opticom, KDDI, and SoftBank. In stands for uploads and Out stands for downloads in the Total traffic by broadband service subscribers in Japan (estimated), the Traffic per broadband service subscriber (estimated), A1, and A2 columns.

Total traffic by broadband service subscribers in Japan was estimated from the traffic of ISP5 broadband service subscribers (A1) and the ISP5 share of all subscriptions.

A1 includes the following types of traffic:

☑ Traffic on interior Wi-Fi

● Some traffic on public Wi-Fi services from some ISP carriers

● Some traffic on femtocell services from some mobile communication carriers

● Some mobile communication traffic between mobile phone networks from some ISP carriers (since May 2011)

Of the traffic exchanged without passing through major domestic IXs, B2 includes traffic exchanged via private peering with domestic ISPs, transit, and public peering at other domestic IXs.

Of the traffic exchanged without passing through major domestic IXs, B3 includes traffic exchanged via private peering with overseas ISPs, transit, and public peering at overseas IXs.