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Dynamic redundancy of the radio transmitters

IP.com Disclosure Number: IPCOM000234950D
Original Publication Date: 2014-Feb-18
Included in the Prior Art Database: 2014-Feb-18
Document File: 4 page(s) / 343K

Publishing Venue

Motorola

Related People

Dworakowski, Waldemar: INVENTOR [+2]

Abstract

This paper describes means that could improve reliability of multi-transmitter sites. We propose introduction of small number of transmitters not strictly allocated to specific radio frequency channel. We propose additional means to route signal from standby (backup) transmitters to an antenna. Additionally, we propose means that allow standby transmitters to follow changes of the configuration of each active transmitter they replace in the real time. Further, there are described means to verify ‘health’ of the transmitter. Finally we propose means to substitute failed transmitter by the backup transmitter both for the network communication and for the connection to the antenna.

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Dynamic redundancy of the radio transmitters

By Waldemar Dworakowski, Grzegorz Szyszka

Motorola Solutions, Inc.

GP&S Business

 

ABSTRACT

This paper describes means that could improve reliability of multi-transmitter sites. We propose introduction of small number of transmitters not strictly allocated to specific radio frequency channel. We propose additional means to route signal from standby (backup) transmitters to an antenna. Additionally, we propose means that allow standby transmitters to follow changes of the configuration of each active transmitter they replace in the real time. Further, there are described means to verify ‘health’ of the transmitter. Finally we propose means to substitute failed transmitter by the backup transmitter both for the network communication and for the connection to the antenna.

PROBLEM

In radio transmission sites we usually have multiple transmitters working on different (but usually nearby) frequencies.

To reduce effect of the failure of the single transmitter in systems transmitters have backup transmitters yet they usually are in one-to-one relation.

The reasons why it is done that way are:

·         Existence of the combiner in the antenna tract where single input to the combiner is dedicated to the single frequency.

·         Need to guarantee that backup transmitter is always configured as the active transmitter

·         Ease of operation

As number of active transmitters increase it is not untypical that in the single transmission site we have transmitters for 40 or more channels. If we would still use one to one relation then this would mean 80 transmitters in the same physical location.

Cost of the operation of the radio transmission per site strictly relate to the number of transmitters installed. Reason is cost of the space required for equipment, cost of the location of the antenna on the tower, cost of the power, and cost of the cooling of the equipment. Transmitters must be kept in the standby even when not active to reduce time to operate so usually backup transmitters work all the time but are not keyed up until main transmitter fails.

SOLUTION

Presented idea is to use only a few backup transmitters per site.

The idea requires solving of a few unknown before problems before that organization of the site would be possible to operate.

First problem is how to connect backup transmitter instead of the main transmitter and achieve scalability and ability to detect failures in not allocated backup transmitter.

Solution that we propose to this problem is to use a new hardware device called Antenna Router and which will be described in details below.

Another problem is to achieve ability to quickly substitute failed transmitter even when we change configuration of transmitters on the fly and when failure can occur during no connectivity to the ‘outside world’ and with complete failure of the transmitter.

Solution is the active configuration tracking that will be described below in one of following chapters.

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