Multiple frequency allocation radio frequency device and method

Details Multiple frequency allocation radio frequency device and method Multiple frequency allocation radio frequency device and method

1999-06-24

2003-03-04

Nguyen, Lee (Department: 2683)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S478000, C370S343000, C370S336000, C370S345000, C370S498000, C455S450000

Reexamination Certificate

active

06529488

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to communication systems, including but not limited to transmitters and receivers in radio frequency communication systems.
BACKGROUND OF THE INVENTION
The basic operation and structure of a land mobile radio system is well known. Land mobile radio systems typically comprise one or more radio communication units, such as mobile and portable radios, and one or more repeaters, base stations, or base radios, that transceive information via radio frequency (RF) communication resources. These communication resources may be narrowband frequency modulated channels, TDMA (time division multiple access) slots, carrier frequencies, frequency pairs, FDM (Frequency Division Multiplexed) resources, and other RF transmission media. Land mobile radio systems may be organized as trunked communication systems, where a plurality of communication resources is allocated amongst a group of users by assigning the repeaters on a communication-by-communication basis within an RF coverage area.
A block diagram of an example communication system a known in the art is shown in
FIG. 1. A
communication site
101
services a coverage area
103
using a plurality of base stations, repeaters, and/or base radios
105
. For the sake of simplicity, the term BRs (base radios) will be used to refer to base stations, repeaters, and/or base radios throughout this specification and claims. Within this coverage area are three communication units, a portable radio
107
, and two mobile radios
109
and
111
. Each of these communication units
107
,
109
, and
111
is presently engaged in a different call with the base site
101
. The first communication unit
107
is engaged on communication channel
123
that is sourced by a first BR
113
. The first mobile communication unit
109
is engaged in a call on a communication resource
125
that is sourced by a second BR
115
, and the second mobile communication unit
111
is engaged in a conversation on yet another communication channel
127
that is sourced by a third BR
117
(or BR
119
, e.g.).
As is known in the art, each frequency allocation, such as a TDMA slot, frequency pair, carrier frequency, FDM resource, and so forth, is given a fixed frequency band in which to operate. In today's systems, a different BR is used to service each frequency allocation during a specific time. For example, as shown in
FIG. 2
, frequency allocation
1
(FA
1
) is serviced by BR
201
(BR
1
), frequency allocation
2
is sourced by BR
203
(BR
2
), and frequency allocations
3
through N are sourced by BRs
205
,
207
,
209
,
211
,
213
,
215
, and
217
(BR
3
through BRN), respectively.
Presently, there is a desire to service many more communication units with a single system that covers larger geographic areas and have many different communication resources available at each site. As a consequence, more and more BRs are necessary for each system. In today's systems, a BR is placed at each site for each different communication resource provided at the site. Hence, if there are fifteen different channels at a site, there will be fifteen different BRs at the site. For example, in a multiple site system, where there are fifteen communication resources at each of 10 sites, 150 BRs are necessary. In addition, some systems require back-up BRs to be present in case of an emergency, to ensure communications capability whenever possible. Each site is thus likely to have additional standby BRs in case of emergency. As a result, communication systems requiring so many BRs may be extremely expensive.
Accordingly, there is a need for a less expensive communication system that still provides the same amount of communication throughput over the same coverage area.


REFERENCES:
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patent: 5430716 (1995-07-01), Pawelski
patent: 5608724 (1997-03-01), Green, Jr.
patent: 5809030 (1998-09-01), Mestdagh et al.
patent: 5999818 (1999-12-01), Gilbert et al.
patent: 6023621 (2000-02-01), Jackson et al.

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