Radio telephone receiver with quick quiescent mode

Details Radio telephone receiver with quick quiescent mode Radio telephone receiver with quick quiescent mode

1996-12-19

2001-02-27

Bost, Dwayne D. (Department: 2744)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S039000, C455S343200

Reexamination Certificate

active

06195573

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a receiver, and method for operation thereof, for a radio telephone.
BACKGROUND TO THE INVENTION
Radio telephones, in particular battery powered hand portable telephones, have been designed to be smaller and more lightweight than ever before. This is due to user requirements for small, lightweight mobile terminals. However, users also require longer periods of use of the mobile terminals before the battery requires replacing or recharging. This requirement is in conflict with the requirement that mobile terminals are small and lightweight, since a battery's current capacity is proportional to its weight and/or volume. Thus, in order to increase the time period of operation of a mobile terminal between recharging or replacing of a battery, effort has been made to reduce the power consumption of the mobile terminal, as well as attempting to increase the power to weight (volume) ratio of the batteries for the mobile terminal.
For a mobile terminal there are two distinct modes of operation, each characterized by different power consumption levels. In the first mode, known as an “in call” mode, power consumption is high since the mobile will be periodically transmitting up to 0.8 watts of power for a Class III PDC hand portable for example. The second mode is the “standby” mode. In this mode the mobile terminal operates on a low current consumption for internal housekeeping of the mobile terminal such as a clock, only periodically “waking up” to receive information signals such as paging information from a base station of the radio telephone network. Even when receiving signals the power consumption of the mobile terminal is much lower than when it is transmitting.
Typically, a user of a mobile telephone does not make many calls, and if they do they accept high power consumption. However, users are concerned with the length of standby time, and this is an important marketing feature of a mobile terminal.
FIG. 6
shows a typical radio telephone. The portable radio telephone shown in
FIG. 6
is a cellular telephone
1
powered by a rechargeable battery pack. The telephone
1
includes a transceiver
8
comprising a receiver and transmitter and all the other features
9
conventionally found in a cellular telephone. Also, since these aspects of the telephone are not directly relevant to the instant invention no further details will be given here, except to say that a single microprocessor
4
is employed to control all the basic functions of the telephone
1
and to control the keypad and display functions.
Optionally, however, the telephone functions may be controlled by a master microcomputer, while the keypad and display functions are under the control of a separate slave microcomputer coupled to communicate with the master microcomputer.
The user-interface of telephone
1
comprises a display, e.g. a liquid crystal display
5
, itself well-known in the art and a keypad
6
on the front of the telephone
1
. The display is coupled to and regulated by the microprocessor
4
in the usual manner. The keypad
6
essentially comprises two main sets of keys, namely alpha numeric keys
6
a
associated with alpha numeric data especially for dialling telephone numbers, but also (optionally) for entering alphanumeric data into the telephone memories, e.g. a subscriber number index, and a set of function keys
6
b
for enabling various predetermined functions or operations.
The keys
6
a
are arranged in four rows of three keys each. As is conventional for the numeric key layout of a telephone, the top row comprises keys for numbers
1
,
2
and
3
respectively, the second row down for numbers
4
,
5
and
6
respectively, the next row down for numbers
7
,
8
and
9
respectively, and the bottom row for *,
0
and # respectively. Some or all of these keys may also be associated with alphabet information, as again is quite conventional. The alphabetic rather than numeric data is selected for example by preceding the alphanumeric keystroke with another predetermined keystroke or set of keystrokes, specifically using the function keys. Hence the alphabetic data mode may be enabled for example by preceding the particular keystroke with previously depressing a “MEMORY” or “STORE” key disposed among the function keys
6
b.
As is usual in cellular telephones, the keys
6
b
include a “SEND” and “END” key for respectively initiating and terminating a telephone call. Another key, specifically located in the top left-hand corner is an “ON/OFF” key for turning the telephone on and off, i.e. by connecting and disconnecting the battery pack power supply. Another of the function keys may be a menu or function key labelled, for example, “MENU” or “FUNCTION” or with a suitable abbreviation thereof. Depression of this key enables a variety of pre-set menus, the related instructions of which are stored in memory, to be viewed and selectively enabled. The various menus are selected by depressing the appropriate alphanumeric keys after depressing the “MENU” or “FUNCTION” key. The relevant menu is shown to the user in words or abbreviations on the display panel
5
.
SUMMARY OF THE INVENTION
According to a first aspect of the present invention, there is provided a receiver for a radio telephone, comprising receiving means for receiving a signal comprising multi-stage encoded information, means for recognising information from the multi-stage encoded information or first stage decoded information, and control means for enabling a quiescent mode for the receiver in accordance with a recognition result.
According to a second aspect of the present invention, there is provided a method of receiving multi-stage encoded information signals for a radio telephone receiver, comprising
recognising information from the multi-stage encoded information or first stage decoded information, and
enabling a quiescent mode for the receiver in accordance with a recognition result.
This has the advantage that the receiver need only be turned on if there is the likelihood that the incoming signal requires a response or acknowledgement from the mobile terminal. Thus, the receiver is only kept on when required. This results in a substantial saving in power consumption.
In a preferred embodiment the means for recognising information comprises means for deriving information from the multi-stage encoded information or a first stage decoded information, and comparing means for comparing derived information with predetermined information, the quiescent mode being enabled in accordance with a comparison result.
Preferably, the predetermined information is a bit pattern, and the deriving means derives information bit by bit. This has the advantage that information can be derived quickly on a bit by bit or collection of bits basis, for example block by block.
Additionally, the comparing means compares the derived information bit by bit with the predetermined bit pattern. Thus, the receiver can be put into a quiescent or low power mode quickly if the information is not of interest.
The first stage decoded information is derivable after de-scrambling the received signal. Optionally, the predetermined information is adaptable in accordance with a scrambling process, and the information is derivable from the received multi-stage encoded information signal.
Suitably, the received signal is a paging control channel message. Thus, in standby mode a receiver is only turned on when expecting a message, and only for a duration during which it detects a likelihood of there being a paging message for it. The Applicant believes that the utilisation of the present invention in standby mode for the reception of paging channel messages may result in up to 30% increase in standby time for a given power source (e.g. battery type).
The paging control channel message is indicative of a paging message being present in the received signal. Alternatively, the paging control channel message is indicative of no paging messages being present in the received signal.
The received signal may be an actual

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