|Publication number||US7113810 B2|
|Application number||US 09/993,184|
|Publication date||Sep 26, 2006|
|Filing date||Nov 14, 2001|
|Priority date||Dec 30, 2000|
|Also published as||CN1156181C, CN1364039A, US20020086720|
|Publication number||09993184, 993184, US 7113810 B2, US 7113810B2, US-B2-7113810, US7113810 B2, US7113810B2|
|Original Assignee||Samsung Electronics Co., Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (14), Classifications (9), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims priority to an application entitled “THE ADAPTIVE POWER SAVING METHOD FOR DIGITAL WIRELESS COMMUNICATION SYSTEM DURING STANDBY MODE” filed with the Korean Industrial Property Office on Dec. 30, 2000 and assigned Ser. No. 2000-87188, the contents of which are hereby incorporated by reference.
1. Field of the Invention
The invention relates generally to a method for reducing power consumption in a mobile radio terminal such as a radio telephone, and more particularly, to a method for reducing power consumption in a standby mode of a radio terminal when the radio terminal is operated in a slotted paging mode in a CDMA (Code Division Multiple Access) radio telephone system.
2. Description of the Related Art
The slotted paging mode is a form of DRX (Discontinuous Reception) operations for a mobile radio terminal actuated by a battery such as a cellular radio telephone. The mobile radio terminal is adapted to radio communication with at least one remote base station in the radio telephone system. In the slotted paging mode, when the radio terminal (also referred to as a mobile station) is in an idle mode (or is not in conversation), the radio telephone is generally in a low power state without continuously monitoring a paging channel.
The slotted paging mode is important in the battery life of the radio telephone. It is an object of operating the slotted mode to reduce the operating time of a radio apparatus into the smallest amount and interrupt the power of the radio apparatus as little as possible during a sleep period. In an idle mode, the radio telephone wakes up only in a previously allocated slot by the radio telephone system or for treating certain other conditions such as a user input.
In returning from the sleep period, the radio apparatus should re-acquire an RF (Radio Frequency) link with the base station of the radio telephone system. Acquisition of the link and other operations including communication protocols for such a system are defined in air interface standards. An example of such a standard may include the TIA/EIA (Telecommunications Industry Association/Electronic Industry Association) IS-95: “Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System.” The IS-95 defines a DS (Direct Sequence)-CDMA or CDMA radio telephone system.
In order to re-acquire the RF link, the radio telephone of the CDMA system synchronizes with the system time that is maintained by the base station and a network controller of the CDMA system. The timing for a forward link (base station to mobile station) should be maintained by the radio telephone in anticipation that the radio apparatus is promptly started when an allocated slot is generated. The timing uncertainties are modified and the paging channel is acquired to prepare for treatment.
The synchronization with the forward link includes an alignment of a PN (Pseudorandom Noise) sequence transmitted to a pilot channel by the base station and a locally generated PN sequence. The transmitted sequences include a “short PN” sequence, which is repeated every 26⅔ ms, and a “long PN” sequence, which is repeated every 41 days. The radio telephone includes a sequence generator for generating short and long PN sequences same as those used by the base station. The radio telephone uses a searcher receiver or other mechanism for aligning the short PN sequence with that received from the base station. Once the pilot channel is acquired, the radio telephone acquires a synchronizing channel and the paging channel. Then, the radio telephone correctly demodulates a traffic channel to establish a full-duplex link with the base station.
In the start after the sleep time, the radio telephone synchronizes with the long PN sequence and the short PN sequence. The PN sequences and a frame boundary are repeated with a logical frequency in the IS-95 system. The frame boundary is generated in every third PN roll boundary. The PN roll boundary is defined by a short PN sequence which reverse rolls to the initial value thereof. In the mobile station, the short PN sequence and the long PN sequence are defined as a linear sequence. The short PN sequence and the long PN sequence are generated by using a LSG (Linear Sequence Generator). The LSG is described as a polynomial, and obtained by using a shift register and an exclusive OR gate. Since the short PN sequence is repeated only in every 26⅔ ms, the LSG, when withdrawing from the sleep state, can be conveniently stopped in a specific phase of the sequence until the phase has a correlation with a system PN. Then, the short PN LSG synchronizes with the system timing and starts again.
However, the long PN sequence is repeated only once in every 41 days. It is unpractical that the long PN generator of the radio telephone is stopped (for example, when entering the sleep state) and then the generator is clocked at high speed to catch up the long PN of the system in the start thereafter.
Since the short PN sequence and the long PN sequence are transmitted by the system which varies predictably according to time, the PN sequence acquisition requires that a correct reference time is maintained in the mobile station during the sleep mode. A PN sequence can be suitably determined for the correlation with the system PN sequence in withdrawing from the sleep mode. However, maintaining a precise timing reference requires a relatively high power consumption which is contradictory to the sleep mode designed for low power consumption.
In addition to withdrawing from the sleep mode during the allocated slot, the radio telephone is also required to start for handling other asynchronously generated events in the radio apparatus or for responding to the same. An example of this type of event can include a user input such as pressing a keypad of the radio telephone. The response to such an input should be prompt without any delay which can be recognized by the user.
As it is important in the foregoing related art, a technique for reducing power consumption uses a method in which a receiver in a standby mode is activated only at a pre-designated time to perform a receiving operation during a certain time and then returns to the low power mode by using the slotted paging mode supported by the system. Here, even in the low power mode, minimum clocking is required for the purpose of maintaining synchronization with the system being re-activated and responding to the external input such as an interrupt.
However, while an edge timing should be suitably used in order to use the low frequency clock, actually a mode operated in a high frequency clock is present between receiving modes to maintain the correct edge timing required by the system. Such a mode is referred to as catnap mode in the following description. The operation of this catnap mode is defined with a certain period, and this period is defined via a trade-off according to an experiment.
However, if the operating period of the catnap mode is shorter than required, a loss is caused in power consumption, and if too long, the system may not be suitably synchronized in some cases.
As described hereinbefore, since the catnap mode, which is used for low speed clock compensation to reduce power consumption, is fixed with a certain value, unnecessarily high power consumption may take place or on the contrary abnormal synchronization to the system may take place.
It is therefore an object of the present invention to provide an adaptive method of updating a catnap period so that a stable synchronization to the system can take place without an unnecessary power consumption.
According to an embodiment of the invention to obtain the foregoing object, an adaptive method for reducing power consumption in a standby mode of a digital radio communication terminal is provided. The method comprises the steps: calculating the difference of edge timings between a main clock and a low clock; comparing the calculated timing difference with a predetermined difference reference value; and upgrading or downgrading a catnap period according to the result of the step of comparing.
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
A preferred embodiment of the present invention will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
The present invention is applicable to a digital radio system supporting a slotted paging mode. First, an example of the radio terminal system and the radio terminal will be described in detail in reference to
The base station 102 transmits a spread spectrum signal to the radio telephone 104. A symbol of a traffic channel is spread by using a Walsh code in a process that is known as Walsh covering. The mobile station such as the radio telephone 104 is allocated with a characteristic Walsh code by the base station 102 so that a traffic channel transmission to each mobile station perpendicularly intersects every traffic channel transmission to a different mobile station. The symbol is spread by using a short PN sequence or code repeated every 26⅔ ms or a long PN sequence or code repeated every 41 days. A communication via an RF (Radio Frequency) link between the base station and the radio telephone 104 has the shape of a chip having a velocity of 1.2288 Mega-chips per second. The chip is a data bit.
The radio telephone 104 includes an antenna 106, an analog front end 108, a modem 110, a call processor 112, a timing controller 114, an oscillator 116, a user interface 118 and a battery 150. The battery 150 supplies operating power to other components of the radio telephone 104.
The antenna 106 receives an RF signal from the base station 102 and other neighboring base stations. The received RF signal is converted into an electric signal by the antenna 106, and then sent to the analog front end 108. The analog front end 108 includes an RF section 109 including circuit devices such as a receiver and a transmitter which can be powered off in the slotted paging mode. The analog front end 108 filters the signal to provide a conversion to a base band signal.
The analog base band signal is sent to the modem 110 where the base band signal is converted into a digital data stream for the following process. The modem 110 generally includes a rake receiver and a search receiver. The search receiver searches for a pilot signal which is received by the radio telephone 104 from a number of base stations including the base station 102. The search receiver despreads the pilot signal by using a correlator together with a system PN code generated in the radio telephone 104 by using a local reference timing. The search receiver includes at least one sequence generator such as an LSG 120 to generate the PN code. The modem 110 correlates the locally generated PN code with the received CDMA signal. The modem 110 detects a system timing indicator transmitted by the radio telephone system 100. In particular, the modem 110 detects a PN roll over boundary and sends an indication of the PN roll over boundary to the timing controller 114. The modem also includes a circuit device for transmitting data from the radio telephone 104 to a base station such as the base station 102. The modem 110 can be constructed of conventional elements.
The call processor 112 controls functions of the radio telephone 104. The call processor 112 is operated in response to a stored command program, and includes a memory for storing commands and other data. The call processor 112 includes a clock input 122 for receiving a clock signal and an interrupt input 124 associated with the timing controller 114 for receiving an interrupt request signal. The call processor 112 receives an interval from the base station 102, in which the radio telephone should search for a page. The radio telephone can monitor the paging channel for 160 ms during this interval, but cannot be in a sleep state. The call processor 112 adjusts an event in the radio telephone required for entry and exit into/from the sleep mode. Such an event includes steps of continuously tracing a system time, proceeding to the LSG state, restarting the oscillator 116, enabling power to the RF section 109 of the analog front end 108 and restarting the clock from the timing controller 114 to the modem 110. The call processor 112 is associated with other elements of the radio telephone.
The user interface 118 allows the user to control the operation of the radio telephone 104. The user interface 118 typically includes a display, a keypad, a microphone and a receiver. The user interface 118 is associated with the call processor 112 by a bus 152.
The timing controller 114 controls the timing of the radio telephone 104. In particular, the timing controller 114 controls an entry/exit into/from the slotted paging mode by the radio telephone 104 and a synchronization of the local timing of the radio telephone 104 with the system timing of the radio telephone system 100. The timing controller 114 has a clock input 130 for receiving a clock signal from the oscillator 116, an interrupt input 131 for receiving an interrupt request from the user interface 118 and an interrupt input 132 for receiving an interrupt request from other components of the radio telephone 104.
The timing controller 114 has a timing input 134 for receiving the timing signal from the modem 110 and a timing output 136 for sending the timing signal to the modem 110. The timing signal (designated as “PNSTROBE” in
The oscillator 116 is a reference oscillator for generating a reference clock signal at a first velocity. In the disclosed embodiment, the oscillator 116 generates a precise clock signal having accurate resolution such as a clock signal of 16.8 MHz. The timing controller 114 has a control output 138 for sending a control signal to the oscillator 116. In response to the control signal, the oscillator 116 is activated and inactivated. When inactivated, the oscillator 116 enters the low power mode. The timing controller 114 further sends the control signal (designated as “RXCTRLB” in
In such a method for reducing power consumption of the radio telephone 104 of the radio telephone system, a certain period has been given to the catnap mode so far which operates in the high frequency clock, even in the receiving mode, to maintain a correct edge timing as required by the system to suitably use the edge timing with the low frequency clock.
The present invention adaptively adjusts the operating period of the catnap mode to prevent that the operating period of the catnap mode from having a power consumption loss if in practice, the operating period of the catnap mode is shorter than necessary or the operating period of the catnap mode is not suitably synchronized to the system if too long.
In step 402, it is determined if the edge timing difference “DIFF” of the main clock and the low frequency clock calculated above is over a predetermined difference reference value “DA (Difference Allowed).” Being over the difference reference value “DA”, the process proceeds to upgrade the catnap period calculation variable “TTEMP” by using the difference value “DIFF” and “SFI” in step 403, which is followed by proceeding to step 405. Conversely, if the edge timing difference “DIFF” is less then or equal to the predetermined difference reference value “DA” in step 402, the process proceeds to downgrade the “TTEMP” by using “DIFF” and “SFD” in step 404, which is also followed by proceeding to step 405. Steps 402 to 404 are repeatedly calculated in the catnap generated in the low power mode during one slot cycle.
In step 405, a calculated result is compared to a predetermined value as the maximum critical value “TU.” If the calculated result is greater than the maximum critical value “TU”, the process proceeds to step 406 to shorten the catnap period “T” to prevent any unsuitable synchronization to the system. Conversely, if the calculated result is less than or equal to the maximum critical value “TU”, the process proceeds to step 407. In step 407, the calculated result is compared with a predetermined value as the minimum critical value “TL.” If the calculated result is less than the minimum critical value “TL”, the process proceeds to step 408 to lengthen the catnap period “T” to reduce an unnecessarily consumed current. In step 409, the “TTEMP” is initialized. The process is then repeated by returning to step 401.
In the foregoing construction according to the digital radio communication terminal system of the present invention, the reducing operation of adaptive power consumption can be performed in a standby mode. As described hereinbefore, the invention can adaptively adjust the period for suitable system synchronization which is necessary for the low power mode required by the digital radio mobile terminal thereby having effects to suitably adjust the system synchronization and optimize the consumed current as well according to the system state.
While the invention has been shown and described with reference to a certain preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US6016312 *||Feb 28, 1997||Jan 18, 2000||Motorola, Inc.||Radiotelephone and method for clock calibration for slotted paging mode in a CDMA radiotelephone system|
|US6029061 *||Mar 11, 1997||Feb 22, 2000||Lucent Technologies Inc.||Power saving scheme for a digital wireless communications terminal|
|US6333939 *||Aug 14, 1998||Dec 25, 2001||Qualcomm Incorporated||Synchronization of a low power oscillator with a reference oscillator in a wireless communication device utilizing slotted paging|
|US6453181 *||Nov 4, 1999||Sep 17, 2002||Qualcomm, Incorporated||Method and apparatus for compensating for frequency drift in a low frequency sleep clock within a mobile station operating in a slotted paging mode|
|US6725067 *||Mar 24, 2000||Apr 20, 2004||International Business Machines Corporation||Method and system for restarting a reference clock of a mobile station after a sleep period with a zero mean time error|
|US6735454 *||Nov 4, 1999||May 11, 2004||Qualcomm, Incorporated||Method and apparatus for activating a high frequency clock following a sleep mode within a mobile station operating in a slotted paging mode|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7463910 *||Nov 9, 2005||Dec 9, 2008||Qualcomm Incorporated||Apparatus and method for determining sleep clock timing|
|US7529531||Nov 9, 2005||May 5, 2009||Qualcomm, Incorporated||Apparatus and methods for estimating a sleep clock frequency|
|US7596366 *||Sep 10, 2003||Sep 29, 2009||Temic Automotive Of North America, Inc.||System and method for controlling the power in a wireless client device|
|US7599484 *||May 30, 2003||Oct 6, 2009||Adc Dsl Systems, Inc.||Element management system for managing line-powered network elements|
|US7610035||Apr 11, 2003||Oct 27, 2009||Temic Automotive Of North America, Inc.||System and method for controlling the power in a wireless client device|
|US7783261 *||Feb 25, 2005||Aug 24, 2010||Zte Corporation||Method for wired connection measuring the standby time of a CDMA mobile terminal|
|US8823518 *||Dec 8, 2008||Sep 2, 2014||Motorola Solutions, Inc.||Method of sensor cluster processing for a communication device|
|US20040032947 *||May 30, 2003||Feb 19, 2004||Nattkemper Dieter H.||Element management system for managing line-powered network elements|
|US20040127206 *||Apr 11, 2003||Jul 1, 2004||Van Bosch James A.||System and method for controlling the power in a wireless client device|
|US20040127265 *||Sep 10, 2003||Jul 1, 2004||Van Bosch James A.||System and method for controlling the power in a wireless client device|
|US20060205382 *||Nov 9, 2005||Sep 14, 2006||Wang Michael M||Apparatus and method for determining sleep clock timing|
|US20070105525 *||Nov 9, 2005||May 10, 2007||Wang Michael M||Apparatus and methods for estimating a sleep clock frequency|
|US20090011712 *||Feb 25, 2005||Jan 8, 2009||Zte Corporation||Method for wired connection measuring the standby time of a cdma mobile terminal|
|US20100141399 *||Dec 8, 2008||Jun 10, 2010||Motorola, Inc.||Method of sensor cluster processing for a communication device|
|U.S. Classification||455/574, 455/343.1|
|International Classification||H04M1/73, H04B1/38, H04B1/40|
|Cooperative Classification||H04W52/0287, H04W52/0229, Y02B60/50|
|Nov 14, 2001||AS||Assignment|
Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OF
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIM, GI-BEOM;REEL/FRAME:012326/0990
Effective date: 20011109
|Mar 11, 2010||FPAY||Fee payment|
Year of fee payment: 4
|Mar 7, 2014||FPAY||Fee payment|
Year of fee payment: 8


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Anyway, a lot’s happened since we first wrote about the company’s Kickstarter campaign. It’s racked up nearly 2,500 backers and met its funding goal, raising more than $150,000 (compared to the $40,000 it was hoping to raise). It’s also announced a slightly more expensive version of the device in white — for people who want to be a little bit more fashionable, I guess.
With that success already behind it, the team behind Poppy is thinking about other things that can be done with the device, looking to go beyond just taking and viewing 3-D photos and videos. One possibility is to provide its customers with 3-D-based games, and it’s courting game developers to make that a reality.
Founders Joe Heitzeberg and Ethan Lowry see an opportunity for augmented reality and virtual reality games being made to work with Poppy. While it works to shoot photos and videos, it would also work equally well as a viewfinder for games that wanted to layer AR images on top. Developers could even use the iPhone’s volume buttons, available at the top of the device, for controls. At $49, Heitzeberg says, the device could be a poor man’s version of the Occulus Rift, particularly for casual games.
To be honest, there’s nothing really to stop developers from building for the device. It doesn’t require any special API or anything, just visualization that takes into account the two sides of the screen that get combined in the viewfinder.
Of course, it will help to actually get Poppy into developers’ hands so that they can test it out themselves and refine whatever they hope to build. On that front, now that they’ve reached their funding goal, the guys working on Poppy are hoping to start moving into production and hope to have units shipping by the holidays.
The Kickstarter’s still going for another week. Want one? Get it here.


Auto-dimming mirror/compass with HomeLink® (if equipped)
1) HomeLink® button 1
2) HomeLink® button 2
4) HomeLink® button 3
6) Automatic dimming on/off button
7) Compass display button
8) Compass display
The auto-dimming mirror has an anti-glare feature which automatically reduces glare coming from headlights of vehicles behind you. It also contains a built-in compass and HomeLink® wireless control system.
• By pressing the automatic dimming on/ off button, the automatic dimming function is toggled on or off. When the automatic dimming function is on, the LED indicator will illuminate.
Even with the mirror in the automatic dimming mode, the mirror surface turns bright if the transmission is shifted into reverse. This is to ensure good rearward visibility during reversing.
• By pressing the compass display button, the compass display is toggled on or off. When the compass is on, an illuminated compass reading will appear in the upper right corner of the mirror.
When cleaning the mirror, use a paper towel or similar material dampened with glass cleaner. Do not spray glass cleaner directly on the mirror as that may cause the liquid cleaner to enter the mirror housing and damage the mirror.
Some clips and fender linings must be removed before replacing the air cleaner elements or specific bulbs. ...
Rear window side seating position
1) Head restraint 2) Release button To raise: Pull the head restraint up. To lower: Push the head restraint down while pressing the release button on the top of the seatback. To remove: Whil ...
Never drill the frame or under-body of your vehicle to install a commercial trailer hitch. If you do, dangerous exhaust gas, water or mud may enter the passenger compartment through the ...


When you think of a restful night's sleep, there's an often overlooked yet critical factor in play – the choice of your mattress. It may be a surprise, but the mattress you sleep on can influence your posture and overall well-being.
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Let's explore some options that not only prioritise your comfort but also contribute to your overall well-being:
This mattress places a strong emphasis on both comfort and support. With a 4cm soft plate foam and a hard felt layer, it delivers exceptional orthopaedic support, promoting proper spinal alignment.
With an organic Bamboo fibre cover and 800 Individually hand nested pocket springs, the Noomi mattress ensures a luxurious night's sleep. The individual pocket springs provide optimal support and comfort as they work together to hold you comfortably in any position.
If you seek a luxurious and comfortable mattress, this mattress fits the bill. It boasts substantial thickness, includes a quilted pad, and incorporates a pocket-sprung system that combines to provide a great night's sleep.
Available in Single 3'0", Small double 4'0", Double 4'6", Kingsize 5'0", and Superking 6'0", the Maxitex Cloud Pocket Memory Mattress is the epitome of luxury for any bedroom.
Taking the time to understand your specific needs will set you on the right path to finding the perfect mattress for your posture and health. You are sure to enjoy many restful nights with any of these outstanding mattress options from BedKingdom.


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