scope:

The present document specifies the technical requirements for equipment that supports packet data services and operates in the following TETRA bands:

• TETRA 380: 380-390 MHz Mobile transmit; 390-400 MHz base station transmit;

• TETRA 410: 410-420 MHz Mobile transmit; 420-430 MHz base station transmit;

• TETRA 450: 450-460 MHz Mobile transmit; 460-470 MHz base station transmit;

• TETRA 870: 870-876 MHz Mobile transmit; 915-921 MHz base station transmit;

The technology to be used is that of GSM and the technical requirements are specified by reference to the GSM standards. This specification lists the GSM standards and specifications that apply and specifies which clauses are retained, deleted or amended. The amendments are specified in the annexes of the present document.

The scope of the present document covers the following interfaces, Gi, Gr, Gp and the Air Interface.

The present document supports the following packet data traffic channels:

• PDTCH/F;

• PDTCH/H;

• PDTCH/U;

• PDTCH/D.

It also supports SMS in packet channels and their associated signaling.

All circuit switched channels, including all speech channels are outside the scope of the present document.

NOTE 1: TAPS adapts (E)GPRS technology to provide an overlay network for TETRA systems. TAPS provides high speed packet data at speeds approximately ten times that available in existing TETRA, to support multimedia and other high speed data applications required by existing and future TETRA users.

NOTE 2: TR 101 976 provides an overview description of the principles of TAPS, including a description of the structure of the TAPS specifications.