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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Comparison of mobile phone standards | 2/2 | https://en.wikipedia.org/wiki/Comparison_of_mobile_phone_standards | reference | science, encyclopedia | 2026-05-05T08:24:50.209254+00:00 | kb-cron |
=== Disadvantages of IS-95 === Most technologies are patented and must be licensed from Qualcomm. Breathing of base stations, where coverage area shrinks under load. As the number of subscribers using a particular site goes up, the range of that site goes down. Because IS-95 towers interfere with each other, they are normally installed on much shorter towers. Because of this, IS-95 may not perform well in hilly terrain. USSD, PTT, concatenated/E-sms are not supported by IS-95/CDMA IS-95 covers a smaller portion of the world, and IS-95 phones are generally unable to roam internationally. Manufacturers are often hesitant to release IS-95 devices due to the smaller market, so features are sometimes late in coming to IS-95 devices. Even barring subsidy locks, CDMA phones are linked by ESN to a specific network, thus phones are typically not portable across providers.
== Development of the market share of mobile standards == This graphic compares the market shares of the different mobile standards.
In a fast-growing market, GSM/3GSM (red) grows faster than the market and is gaining market share, the CDMA family (blue) grows at about the same rate as the market, while other technologies (grey) are being phased out
== Comparison of wireless Internet standards == As a reference, a comparison of mobile and non-mobile wireless Internet standards follows.
Notes: All speeds are theoretical maximums and will vary by a number of factors, including the use of external antennas, distance from the tower and the ground speed (e.g. communications on a train may be poorer than when standing still). Usually the bandwidth is shared between several terminals. The performance of each technology is determined by a number of constraints, including the spectral efficiency of the technology, the cell sizes used, and the amount of spectrum available. For more comparison tables, see bit rate progress trends, comparison of mobile phone standards, spectral efficiency comparison table and OFDM system comparison table.
== See also ==
Advanced Mobile Phone System Car phone List of wireless network protocols Spectral efficiency comparison table SMS – contain the content of its standardization
== References ==