Motorola US Patents Applicable or Potentially Applicable to All or Some TETRA products

U.S. Patent App Date Grant Date Expiry

Improved Dispatched Trunked Radio System 4692945 11/19/1986 9/8/1987 11/19/2006 Expired

A method of operating a Radio Transmission or Communication System Including a Central Station and a Plurality of Individual Rem4872204 11/24/1987 10/3/1989 11/24/2007 Expired

Trunked Communication System with Nationwide Roaming Capability 4833701 1/27/1988 5/23/1989 1/27/2008 Expired

Packet-Switched Cellular Telephone System 4887265 3/18/1988 12/12/1989 3/18/2008 Expired

Selective System Scan for Multizone Radiotelephone Subscriber Units 4905301 7/28/1988 2/27/1990 7/28/2008 Expired

Digital Speech Coder Having Improved Long Term Lag Parameter Determination 5097508 8/31/1989 3/17/1992 8/31/2009 Expired

Assigning voice call to a control slot 5239678 11/21/1991 8/24/1993 11/21/2011 [possibly not used in terminals?]

Multi-Channel TDM Communication System Slot Phase Correction 5241544 11/1/1991 8/31/1993 11/1/2011 Applicable only to TEDS (TETRA 2)

Quadrature Amplitude Modulation Synchronization Method 5343499 1/9/1992 8/30/1994 1/9/2012 Applicable only to TEDS (TETRA 2)

Peak to Average Power Ratio Reduction Methodology for QAM Communication Systems 5381449 11/1/1991 1/10/1995 1/10/2012 Applicable only to TEDS (TETRA 2)

Method for Providing and Selecting Amongst Multiple Date Rates in a Time Division Multiplexed System 5533004 11/7/1994 7/2/1996 11/7/2014 Applicable only to TEDS (TETRA 2)

Communication Signal Having a Time-Domain Pilot Component 5519730 10/28/1991 5/21/1996 5/21/2013 Applicable only to TEDS (TETRA 2)

Scalable Pattern Methodology For Multicarrier Communications Systems 6424678 8/1/2000 7/23/2002 8/1/2020 Applicable only to TEDS (TETRA 2)

Slot Format and Method for Increasing Random Opportunities in a Wireless Communication System 7088734 3/27/2001 10/3/2002 3/27/2021 Applicable only to TEDS (TETRA 2)

Encryption Synchronization Combined with Encryption Key Identification 5185796 5/30/1991 2/9/1993 5/30/2011 See Note 1 below

Communications Apparatus 5481541 8/13/1992 1/2/1996 1/2/2013 See Note 1 below

Power Amplifier Linearization in a TDMA Mobile Radio System 5559807 11/17/1994 9/24/1996 11/17/2014 See Note 1 below

Digital Speech Coder Having Improved Sub-Sample Resolution Long-Term Predictor 5359696 3/21/1994 10/25/1994 3/21/2014 See Note 1 below

Using TETRA SSI as a key modifier. Applies to DMO 5357571 7/1/1993 10/18/1994 7/1/2013 See Note 1 below

Notes

1. Whether this patent is essential to various TETRA products is not noted here, but it is potentially applicable at minimum to some products.

2. TEDS (TETRA 2) is an addition to TETRA not yet substantially deployed. It uses two or more channels to achieve higher speed data, up to 100's kbs. It requires the spectrum to achieve this.

Conclusions

1. By the later part of 2014, no Motorola US patent will remain valid with regard to TETRA (1 or 2) products.

2. "Narrowband" requirement in the US for entities holdings certain VHF and higher channels to move to 12.5 kHz (or more narrow) channels, on actual or effective basis, is early 2013.

The FCC accepts 4-slot TDMA, which provides 6.25-kHz effective channels, as meeting this narrowband requirement. (So does NTIA, for Federal agencies.)

3. Entities moving from old 25-kHz channel equipment to narroband equipment may use TETRA from the start without patent infringment, in ways the undersinged has explained, and that

a US Court may address, if appropriate in some cases. Or, they may commence with MPT1327 using base stations that support MPT and TETRA, and migrate to TETRA. The MPT

terminals will communicat with the TETRA terminals via the infrastructure.

These patents claimed applicability to TETRA can be confirmed in the ESTI communications with Motorola posted at www.tetra-us.us