Product Description

nanoBTS Product Description Software Specification

5.9 Traffic

5.9.1 Channel Types

The BTS supports the transport of

• Full Rate (FR)

• Enhanced Full Rate (EFR) GSM speech.

• AMR full- and half-rate speech (requires 165 BTS with SR3 software)

• BS20 (14.4k) single slot circuit switched data.

• BS21-26 (up to 9600) single slot circuit switched data

• BS61 and BS81 speech-then-data and alternate-speech-and-data.

The BTS does not perform any transcoding, but it does perform rate adaption for circuit

switched calls to deliver all CSD bearers in V.110 frame format, for compatibility with the

ip.access circuitBSC.

5.9.2 Encryption

The BTS supports A5/1 and A5/2 encryption, as well as no-encryption. Some units may

not be supplied with encryption in the software load, because of export restrictions or other

reason. The BTS rejects attempts to set up channels with encryption scheme not

supported in a particular software build.

5.9.3 Traffic Frame Formats

The BTS supports the carrying of raw 64kb/s payload for circuit switched data (as PCM

may be carried by IETF standards).

The BTS supports the IETF standard frame format of RTP for Speech calls on (for AMR

see RFC3267, and RFC3551 for FR/EFR).

The BTS supports a nanoGSM-proprietary RTP payload format for multiplexed payloads

(to minimise bandwidth).

5.10 Performance

The BTS is rated to support a loading of 600 BHCA with <1% error rate of call set-up

failures, directed retries, handovers and location updates due to internal performance

constraints of the BTS.