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Method for power reduced transmission of speech inactivity
| Details |
Inventors: Bruhn, Stefan;
Assignee: Telefonaktiebolaget L M Ericsson (publ) (Stockholm, SE)
Primary Examiner: Olms; Douglas
Assistant Examiner: Pizarro; Ricardo M.
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.
A method is disclosed for reducing the power during discontinuous transmission in a digital cellular systems. In order to reduce battery usage and decrease interference to other users, a method is disclosed which employs the transmission of a silence descriptor frame and the following reduction of power once the frame is properly received in the receiver. While the power is reduced there is still the ability to receive and decode inactivity frames. |
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DETAILED DESCRIPTION While the present invention will be described in connection with several exemplary embodiments, it will be understood by those skilled in the art that the invention is not intended to be limited to these particular examples.
On the contrary, the present invention is intended to cover all alternatives, modifications and equivalent arrangements within the spirit and scope of the invention.
For example, while the exemplary embodiments described below are based upon the GSM standard, the present invention can be applied in any other TDMA based system, for example DAMPS, PDC or NMTS.
Moreover, the present invention is not limited to access methodologies which include TDMA, but can also be applied to frequency division multiple access (FDMA), code division multiple access (CDMA) or hybrids thereof.
As mentioned above, one object of the present invention is to provide continuous (or more frequent or equal rate) but power reduced transmission during non-speech periods by exploiting the fact that the number of information bits per frame to be transmitted for SID information is much less than that associated with speech frames.
This allows additional redundancy (i.
e.
, more code bits) to be used which provides a very high amount of error protection.
The resulting gain in error protection permits transmission at a reduced power level while still fulfilling requirements concerning channel error robustness.
The present invention can be implemented in different ways.
A first exemplary embodiment uses all of the available gross bit rate to transmit coded SID information to provide a continuous but power reduced transmission during non-speech periods.
A second exemplary embodiment, as described below, also reduces the transmission power of the non-speech frames but does not use all of the available gross bit rate to transmit SID information.
For exemplary embodiments employing continuous transmission, the following exemplary parameters are used as a basis for describing these exemplary embodiments
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Cell Phones 
