RFIS-136 vs IS-95: 2G Cellular Technology Comparison
cellular technology
2g
is-136
is-95
mobile communication
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This article compares IS-136 and IS-95, exploring the similarities and differences between these two 2nd generation cellular systems.
Similarities Between IS-136 and IS-95
Both IS-136 and IS-95 are second-generation (2G) cellular technologies designed to facilitate mobile-to-mobile communication. Key similarities include:
- 2G Systems: Both belong to the 2G era of mobile technology.
- Time of Introduction: Both were introduced in the 19th century.
- Frequency Spectrum: They operate within the same frequency spectrum: 869 MHz to 894 MHz for the downlink (base station to mobile) and 824 MHz to 849 MHz for the uplink (mobile to base station).
Differences Between IS-136 and IS-95
While they share some common ground, IS-136 and IS-95 differ significantly in their underlying technologies and implementations.
| Feature | IS-136 | IS-95 |
|---|---|---|
| Multiple Access | TDMA (Time Division Multiple Access) | CDMA (Code Division Multiple Access) |
| Channel Bandwidth | ~30 KHz | ~1250 KHz |
| Modulation | pi/4 (DQPSK) | QPSK |
| Speech Coding | VSELP | QCELP |
| Frame Duration | ~40ms | ~20ms |
| Duplex Channels Supported | 832 | 20 |
In summary:
- Multiple Access: IS-136 employs TDMA, dividing the channel into time slots, whereas IS-95 uses CDMA, where multiple users share the same channel simultaneously, differentiated by unique codes.
- Bandwidth: IS-95 utilizes a much wider channel bandwidth compared to IS-136.
- Modulation: They use different modulation schemes for transmitting data.
- Speech Coding: They also differ in the speech coding techniques employed to compress and transmit voice data.
- Frame Duration: IS-136 has a longer frame duration compared to IS-95.
- Channel capacity: IS-136 supports more channels than IS-95.
