Figure 6-2-2-5 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 2016 (March 31, 2017)),” MIC

(b) Transitions in traffic exchanged between ISPs

The traffic exchanged with major domestic internet exchanges (IX)s $ ^{48} $ (B1), the traffic exchanged with domestic ISPs without passing through major domestic Internet exchanges (IX) (B2) and traffic exchanged with overseas ISPs (B3), data inflow has exceeded outflow in all types. The gap has been increasing (Figure 6-2-2-6).

## (c) Estimations 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, CATV, FWA) — and the percentage of ISP5 subscriptions among all broadband subscriptions in Japan. This estimate found that an average of approximately 8.3 Tbps of traffic passed over the Internet during November 2016. This was a 52.2 percent increase from the same month 1 year ago, continuing the increase in traffic over the Internet (Figure 6-2-2-6).

## (ii) Mobile communication traffic

### ● Mobile communication traffic increased at a pace of about 1.4 times over the last year

The rapid increase in traffic, particularly data communications, in recent years is a significant factor in radio spectrum congestion in the frequencies assigned to mobile communication systems. In view of this, five mobile communication carriers (NTT Docomo, KDDI, SoftBank, UQ Communications, and Wireless City Planning) worked together to tabulate and analyze data on mobile communication traffic volumes (non-voice traffic). According to this group's figures, as of March 2016 mobile communication traffic increased about 1.4 times over the last year, reaching an average of 1815.6 Gbps (Figure 6-2-2-7).

Figure 6-2-2-6 Tabulations and estimates of Internet traffic in Japan $ ^{*1*2} $

【Traffic tabulations and estimates】

Year	Month	Total traffic by broadband service subscribers in Japan (estimated) [Gbps] $ ^{*3} $	Traffic per broadband service subscriber (estimated) [kbps]	(A1) Traffic by broadband service subscribers (DSL, FTTH, CATV, FWA, 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 sub-scrip-tion numbers) $ ^{*4} $
in	out	in	out	in	out	in	out	in	out	in	out	in	out
2012	May	658	1,730	18.8	49.3	287.8	756.6	251.5	243.0	118.4	98.6	317.4	145.1	528.7	178.8	43.82%
November	666	1,905	18.9	54.0	294.0	840.3	268.3	257.2	103.2	83.2	316.6	135.7	571.3	201.6	43.99%
2013	May	770	2,275	21.7	64.2	347.8	1,027.8	300.3	286.4	114.5	85.5	423.3	161.3	633.9	231.6	44.52%
November	834	2,584	23.3	72.3	370.0	1,146.3	336.5	326.2	138.9	94.9	520.8	186.2	714.5	259.7	44.28%
2014	May	905	2,892	25.2	80.4	398.9	1,274.5	359.2	317.2	163.6	101.5	614.9	214.3	808.3	282.3	44.02%
November	930	3,552	25.7	98.2	407.6	1,557.0	496.1	426.1	192.3	104.6	765.1	246.5	924.6	340.6	43.80%
2015	May	1,086	4,582	29.3	123.5	457.0	1,928.9	525.6	440.2	198.9	117.5	955.6	287.5	941.5	308.1	43.10%
November	1,051	5,423	28.0	144.5	452.9	2,336.1	581.1	503.0	251.9	137.1	1,306.4	366.6	1,059.7	307.9	42.48%
2016	May	1,324	6,876	34.8	180.5	551.5	2,863.3	652.7	570.5	277.0	112.6	1,765.1	453.8	1,080.1	292.4	41.64%
November	1,464	8,254	37.9	213.5	602.5	3,396.6	1,246.0	653.6	311.0	113.6	1,989.2	518.2	1,221.9	353.8	41.15%

(Notes) *1 ISP5 is the total for five cooperating ISPs, namely the Internet Initiative Japan (IIJ), NTT Communications, K-Opticom, KDDI, and SoftBank. *2 the Total traffic by broadband service subscribers in Japan (estimated), the Traffic per broadband service subscriber (estimated) For A1, and A2 columns, In stands for uploads and Out stands for downloads.

*3 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 (X).

$ ^{*} $ 4 Estimation by linear interpolation using the data of “Announcement of Quarterly Data on Telecommunication Service Contracts and Market Shares”