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Low power consumption for STB standby active mode in Satellite and DTT systems

IP.com Disclosure Number: IPCOM000178954D
Publication Date: 2009-Feb-01
Document File: 6 page(s) / 558K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present paper is intended to describe a system that allows the DVB satellite and DTT STB to operate active standby mode with low power consumption.

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Title: Low power consumption for STB standby active mode in Satellite and DTT systems

Author: Jie Wang

Abstract:

The present paper is intended to describe a system that allows the DVB satellite and DTT STB to operate active standby mode with low power consumption.

The problem:

In digital TV broadcast systems, STBs often require to be permanently connected to the broadcast network in order to be reactive to the broadcast system maintenance signals. The system maintenance signals may include, e.g., the service plan change, new system software download, daily EPG data update, program schedule change, new VOD program catalogue etc. Emergency message is not part of the system maintenance data, but it also needs the immediate reaction of the STB when it arrives.

When such permanent connection to the network is required, if the user does not use the STB to watch or to record programs or any main function, the STB is usually turned into standby active mode, meaning that it continue to “listen” to the broadcast signals without processing audio and video.

In European CoC [Ref.1], the definition of Standby active is as follows:

“The appliance is connected to a power source, does not fulfil a main function but can be switched into another mode with the remote control unit or an internal signal. It can additionally be switched into another mode with an external signal or it is receiving a minimal level of data from an external source.”

The problem is that, in the standby mode, the STB continue to consume significant amount of electricity. Our lab test on a given satellite STB showed that its electricity consumption in the standby active mode may be very close to its active mode (16W vs. 20W). 

The European committee has established a specification in order to save energy - Code of Conduct on Energy Efficiency of Digital TV Service Systems [Ref.1]. In fact, it estimates that with the applications according to this CoC, a total European consumption may be reduced from 23 TWh to 15 TWh per year, which is equivalent to total saving of about 750 Million euros per year.

The European Code of conduct specifies the following consumption limits in standby active mode for complex STBs in basic configuration for the period from 1-1-2009 to 31-12-2009:

  • Cable : 6.0 W
  • Terrestrial: 5.0 W
  • Satellite: 7.0 W
  • DSL: 5.0 W

Clearly, our tested satellite STB does not meet the European Code of Conduct requirement.

In general, system maintenance data are cyclically broadcast. The STB needs to acquire the data from the live stream once in order to store them in the local memory and then it shall wait for the next data version change.  In the emergency system, the STB may be requested to perform immediate actions. Usually, the system maintenance data are not frequent.

With the current DVB-S/C/ T broadcast systems, the system maintenance vers...