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Efficient paging system with sleep mode duration determined by the guaranteed number of repeats
| Details |
Inventors: Dent, Paul W.;
Assignee: Ericsson Inc. (Research Triangle Park, NC)
Primary Examiner: Hudspeth; David R.
Assistant Examiner: Richardson; Scott
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.
A method for efficiently paging a mobile phone in a radio communication system having a plurality of mobile phones is disclosed. A first paging signal is transmitted for a mobile phone on a first try channel. If the mobile phone does not acknowledge the first paging signal within a predetermined period of time, the call is transferred to at least a second try channel. A second paging signal is then transmitted for the first mobile phone on at least the second channel. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention applies to radiotelephone systems such as cellular phone systems or a satellite communication system or a hybrid system serving dual mode cellular/satellite portable phones or any other radiotelephone system.
The present invention is particularly advantageous when a high percentage of mobile phones, perhaps 90%, will receive a call on the first attempt even with little or no error correction coding.
Thus, according to one embodiment of the present invention, first call attempts are transmitted from the network with little or no error correction coding in the signal.
In addition, the signal is not repeatedly transmitted for the majority of mobiles that reply within a predetermined period of time which may range from but is not limited to 0.
5 to 2 seconds.
A method for efficiently using the calling channel will now be described in more detail in connection with FIG.
2.
A call signal is first transmitted on the calling channel in step S200.
If the mobile phone acknowledges the transmitted signal, in step S210, the system connects the call to the paged mobile phone in step S220.
However, if the mobile phone does not acknowledge the transmitted page signal within a predetermined period of time in step S210, the call is transferred to another calling channel, i.
e.
, a second try channel, in step S230.
The paging signal is then transmitted on the second try channel in step S240.
If the mobile station acknowledges the paging signal on the second try channel, in step S250, the system connects the call to the mobile phone in step S220.
However, if the mobile phone does not acknowledge the paging signal on the second try channel, the call is transferred to another channel which transmits another paging signal for the mobile station.
This procedure can be repeated on more channels if the mobile station does not acknowledge the paging signal on the third try channel.
The second try channel only needs approximately 10% of the capacity of the first try channel, given the 90% chance of first time success
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