Telecommunications – Transmitter and receiver at separate stations
Patent
1995-05-25
1998-02-24
Pham, Chi H.
Telecommunications
Transmitter and receiver at separate stations
455343, H04B 700, H04Q 302, H04Q 914
Patent
active
057220654
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the constitution of the paging signal sequences sent to mobiles in a mobile communications system, and to the constitution of the mobiles. It relates in particular to a battery saving technique for mobiles. This invention can be utilized not only in the radio paging system described in the embodiments, but also in general mobile communications systems in which mobile units receive, on the basis of intermittent receiving, paging signals that have been transmitted from a base station.
BACKGROUND TECHNOLOGY
A prior art example will be explained with reference to FIG. 4 and FIG. 5. FIG. 4 shows the overall constitution of a radio paging system, while FIG. 5 shows the format of the paging signal sequences used in said radio paging system. In a conventional radio paging system, as shown in FIG. 4, radio waves comprising modulated paging signal sequences are transmitted from base station 1 as a result of call requests from telephone terminal equipment 5 connected to telephone network 4, whereupon radio paging receivers 2 which have received these radio waves are paged.
As shown in FIG. 5(a), the paging signal sequences transmitted from base station 1 comprise n subframes F1-Fn, while, as shown in FIG. 5(b), the signal corresponding to each subframe Fi consists of k paging signals S1-Sk. Paging signals S1-Sk respectively comprise address signals A1i-Aki which are subscriber ID signals, plus message signals M1i-Mki which follow said address signals.
Radio paging receivers 2 are capable of receiving only in one or more assigned subframes F, and receive each of the signals in this or these subframes F. FIG. 5(c) shows the receiving state of a radio paging receiver to which subframe Fi has been assigned. When an address signal A1i-Aki in the received signal matches the address number Aki of radio paging receiver 2 to which subframe Fi has been assigned, a ringing tone is emitted by the radio paging receiver 2 in question, and message signal Mki which immediately follows this address signal Aki is displayed on the liquid crystal display (LCD). A system in which radio paging receiver 2 becomes capable of receiving only during the one or more subframes F which have been assigned to said radio paging receiver is called intermittent reception, and achieves extended battery life by utilizing the fact that most of the time, receiving is unnecessary because paging signals S1-Sk directed at radio paging receivers 2 are usually transmitted no more than a few times a day.
It may be mentioned that during the night and at other times when the traffic volume of paging signals S1-Sk is small, there will be cases in which a given subframe Fi is not filled with paging signals, and cases in which no paging signals S1-Sk are present in a given subframe Fi.
The state of subframes F1-Fn under such circumstances is shown in FIG. 6, which shows the state of subframes F1-Fn when there is little traffic of paging signals S1-Sk. When a given subframe Fi is not filled with paging signals S1-Sk, termination signals E indicating the end of paging signals S1-Sk within a given subframe Fi are transmitted a plurality of times immediately following paging signal S1 up to the very end of this subframe Fi. If no paging signals S1-Sk are present in a given subframe Fi, then the entirety of said subframe Fi is transmitted as a plurality of termination signals E. Under these circumstances, as shown in FIG. 6(c), a radio paging receiver which has been assigned only subframe Fi becomes capable of receiving only when subframe Fi is being received, and discontinues its receiving operation when a termination signal E has been received. This enables the consumption of power in unnecessary signal reception to be suppressed.
In Japanese Unexamined Patent No.63-199526 there is disclosed an intermittent receiving method wherein the length of the frame to be intermittently received changes in accordance with traffic volume. This method pertains not to radio paging receivers but to telephone equipment, and because the len
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Ito Shogo
Yamao Yasushi
Arthur Gertrude
NTT Mobile Communications Network Inc.
Pham Chi H.
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