CN100429682C - Method and system for reducing power consumption of IrDA enabled handsets - Google Patents
Method and system for reducing power consumption of IrDA enabled handsets Download PDFInfo
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- CN100429682C CN100429682C CNB2005100918616A CN200510091861A CN100429682C CN 100429682 C CN100429682 C CN 100429682C CN B2005100918616 A CNB2005100918616 A CN B2005100918616A CN 200510091861 A CN200510091861 A CN 200510091861A CN 100429682 C CN100429682 C CN 100429682C
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Abstract
Certain aspects of reducing power consumption of IrDA enabled devices by dynamically turning ON/OFF an IrDA port may comprise receiving a first signal, which indicates that IrDA data is received. In response to receiving the IrDA data, a second signal such as an interrupt signal may be generated and sent to a processor. The second signal may cause the processor to wakeup from a power saving mode or state. The processor may receive a connection request and in response to the received connection request, the processor may generate and send a connection response to the IrDA enabled device. If it is determined that the IrDA enabled device has received the connection response, then an IrDA connection may be established between the processor and the IrDA enable device.
Description
Technical field
Some embodiment of the present invention relates to IrDA and activates handheld device.More specifically, some embodiment of the present invention relates to and a kind ofly reduces the method and system that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically.
Background technology
Infrared data ANSI (Infrared Data Association is called for short IrDA) is a standard, and it has stipulated to come by infrared radiation the mode of wirelessly transmitting data.This IrDA standard comprises the standard of the agreement that physical equipment and this physical equipment are used to communicate with one another.
Infrared remote control unit can be used to control many common consumption electronic products, as PDA, TV and DVD player.For example, when a button of pressing on this remote control unit, signal sends to the equipment that comprises infrared remote receiver from this remote control unit.Utilize frequency range for the modulated carrier wave coding of 30kHz 56kHz with send this signal, wherein to be appointed as IrDA used for this frequency range.It is mobile device that great majority have the equipment of IrDA ability, as kneetop computer, PDA and cell phone.These device designs are, by when equipment is unmovable it being transformed into the life-span that sleep pattern keeps battery.In this, the one or more processors in the particular device are configured to: when this equipment sensing to one unmovable period, this processor enters sleep pattern, or some battery saving mode.For example, an equipment is not used in a preset time section, and then sleep pattern can be closed this equipment automatically, to keep battery life.When an equipment is in sleep pattern and data and is sent to this equipment, its revive and enter can handle the operating state that is received data before, need a period of time.As a result, because the inherent delay in the wakeup process, this equipment has lost some initial characteristicses.Even some systems can minimize recovery time, feature still can be lost.
A kind of solution to this problem comprises that the menu by handling handheld device or portable system manually will activate or stop infrared function at present.This IrDA port can be configured to make that this equipment keeps lasting active state, never enters sleep pattern when this IrDA port is activated, and has therefore increased energy consumption.On the other hand, by making this infrared port hold function, equipment enters sleep state in the not use age that prolongs, and therefore causes the valuable information dropout that sends by infrared port.
By such system and the present invention are compared with reference to described some aspect of the remainder of accompanying drawing, concerning the those of ordinary skill in this field, more limitations and shortcoming conventional and classic method will become clearly.
Summary of the invention
Some embodiment of the present invention provides a kind of method and system that reduces the energy consumption of IrDA activated equipment such as handheld device by opening/closing IrDA port dynamically.Some aspect of this method comprises receiving indicates received first signal of IrDA data.Response receives this first signal, produces the secondary signal of impelling processor to revive from low-energy state.When this processor when low-energy state is revived, this processor receives and handles the IrDA data.This secondary signal can be a look-at-me.
This processor receives a connection request, and when the IrDA activated equipment receives response from this processor, sets up IrDA and be connected between this processor and this IrDA activated equipment.This connection request can be a serial infrared (serial infra red is called for short a SIR) connection request, and this processor produces a serial infrared (SIR) connection response to respond this connection request.Can determine whether serial infrared (SIR) connection response that this processor sends is received by this IrDA activated equipment.When definite this serial infrared (SIR) when connection response is received, between this IrDA activated equipment and this processor, set up IrDA and be connected.
This processor waits for that this IrDA activated equipment stops to send the IrDA data, and when this IrDA activated equipment stopped to send the IrDA data, first counter was activated.Can determine whether these IrDA data are just received by processor.If this processor receives the IrDA data from this IrDA activated equipment, this first counter is reset.Can determine whether this first counter has reached threshold value, if this processor can be activated into a kind of battery saving mode.
If this IrDA activated equipment does not receive from the serial of this processor infrared (SIR) connection response, wherein this serial infrared (SIR) connection response is that response is from the serial of this IrDA activated equipment infrared (SIR) connection request, between this IrDA activated equipment and this processor, to connect, can increase by second counter.Can determine also whether this second counter has reached a maximum count value.If determine not reach this maximum count value, this IrDA activated equipment also can be sent to processor with another one serial infrared (SIR) connection request.If reached this maximum count value, this IrDA activated equipment produces overtime (TIME OUT) information, show this IrDA activated equipment can not with this processor communication.
An alternative embodiment of the invention provides a machine readable memory, has stored computer program thereon, and this computer program has at least one to be used for reducing the code section of the energy consumption of IrDA activated equipment.This at least one code section can be carried out by machine, thereby impels machine to carry out above-mentioned steps, to pass through the dynamically energy consumption of opening/closing IrDA port minimizing IrDA activated equipment.
According to another embodiment of the invention, provide a kind of system that is used for reducing the energy consumption of IrDA activated equipment.In this, this system comprises the circuit of first signal that receives the received IrDA data of indication.Response receives this first signal, and this circuit produces the look-at-me of impelling a processor to revive from low-energy state.When this processor when this low-energy state is revived, it can receive and handle these IrDA data.
This system can comprise reception by processor send, in order to the circuit of the connection request that between this processor and this IrDA activated equipment, connects.This connection request can be a serial infrared (SIR) connection request, and this system comprises the circuit of serial infrared (SIR) connection response that produces this connection request of response.This system comprises the circuit of determining whether serial infrared (SIR) connection response has been received by this IrDA activated equipment.If this serial infrared (SIR) connection response is received, this system is included in and sets up the circuit that IrDA connects between this IrDA activated equipment and this processor.
This system can comprise the circuit of waiting for that this IrDA activated equipment stops to send these IrDA data and start first counter when this IrDA activated equipment stops to transmit these IrDA data.This circuit is used to determine whether these IrDA data are just received by this processor, if this processor has received the IrDA data from this IrDA activated equipment, this first counter is reset.This system comprises also whether definite this first counter has reached threshold value and made this processor enter the circuit of battery saving mode when this first counter reaches threshold value.
In another aspect of this invention, this system comprises a circuit, if described IrDA activated equipment does not receive from the serial of this processor infrared (SIR) connection response, wherein this serial infrared (SIR) connection response is that response is from the serial of this IrDA activated equipment infrared (SIR) connection request, to connect between this IrDA activated equipment and this processor, then this circuit increases by second counter.This system comprises also whether definite this second counter has reached the circuit of a maximum count value.If reached maximum count value, then this IrDA activated equipment can comprise produce this IrDA activated equipment of indication can not with the circuit of overtime (TIME OUT) information of this processor communication.If do not reach this maximum count value, this circuit can be used to another serial infrared (SIR) connection request is sent to processor.
According to an aspect of the present invention, provide a kind of method of energy consumption of the IrDA of minimizing activated equipment, this method comprises:
Receive first signal of the received IrDA data of indication; And
Response receives described first signal, produces the secondary signal of impelling processor to revive from low-energy state.
Preferably, described method also comprise when described processor when described low-energy state is revived, receive described IrDA data by described processor.
Preferably, described method also comprise when described processor when described low-energy state is revived, by the described IrDA data of described processor processing.
Preferably, described secondary signal is a look-at-me.
Preferably, described method also comprises:
Receive connection request; And
Setting up IrDA between described processor and described IrDA activated equipment is connected.
Preferably, described connection request is serial infrared (SIR) connection request.
Preferably, described method comprises that also producing serial infrared (SIR) responds to respond described connection request.
Preferably, described method comprises also whether definite described serial infrared (SIR) connection response is received.
Preferably, described method also comprises if described serial infrared (SIR) connection response is received, and sets up IrDR and connects.
Preferably, described method comprises that also the described IrDA data of wait stop.
Preferably, described method also comprises startup first counter.
Preferably, described method comprises also whether definite described IrDA data are received.
Preferably, described method also comprises if described IrDA data are received, described first counter of resetting.
Preferably, described method comprises also whether definite described first counter has reached threshold value.
Preferably, described method also comprises if described first counter has reached described threshold value, starts described processor and enters battery saving mode.
Preferably, described method also comprises if described serial infrared (SIR) connection response is not received, increases by second counter.
Preferably, described method comprises also whether definite described second counter reaches maximum count value.
Preferably, described method also comprises if reach described maximum count value, produces time-out information.
Preferably, described method also comprises if do not reach described maximum count value, sends another serial infrared (SIR) connection request.
According to an aspect of the present invention, provide a kind of system of energy consumption of the IrDA of minimizing activated equipment, this system comprises:
Receive the circuit of first signal of the received IrDA data of indication, and
Response receives the circuit that described first signal produces secondary signal, and described secondary signal is impelled processor
Revive from low-energy state.
Preferably, described system also comprises the circuit that impels described IrDA data to be received by described processor when described processor when described low-energy state is revived.
Preferably, when described processor when described low-energy state is revived, the described IrDA data of described processor processing.
Preferably, described secondary signal is a look-at-me.
Preferably, described system also comprises:
Receive the circuit of connection request; And
Between described processor and described IrDA activated equipment, set up the circuit that IrDA is connected.
Preferably, described connection request is serial infrared (SIR) connection request.
Preferably, described system comprises that also generation serial infrared (SIR) connection response is to respond the circuit of described connection request.
Preferably, described system also comprises and determines whether received circuit of described serial infrared (SIR) connection response.
Preferably, described system also comprises if described serial infrared (SIR) connection response is received, and sets up the circuit that IrDA connects.
Preferably, described system also comprises the circuit of waiting for that described IrDA data stop.
Preferably, described system also comprises the circuit that starts first counter.
Preferably, described system also comprises and determines whether received circuit of described IrDA data.
Preferably, described system also comprises if described IrDA data are received, the circuit of described first counter of resetting.
Preferably, described system comprises also whether definite described first counter has reached the circuit of threshold value.
Preferably, described system also comprises if described first counter has reached described threshold value, starts the circuit that described processor enters battery saving mode.
Preferably, described system also comprises if described serial infrared (SIR) connection response is not received, increases the circuit of second counter.
Preferably, described system comprises also whether definite described second counter reaches the circuit of maximum count value.
Preferably, described system also comprises if reach described maximum count value, produces the circuit of time-out information.
Preferably, described system also comprises if do not reach described maximum count value, sends the circuit of another serial infrared (SIR) connection request.
According to an aspect of the present invention, provide a kind of machine readable memory, storage computation machine program thereon, this computer program has at least one code section that is used for reducing the energy consumption of IrDA activated equipment.This at least one code section is carried out by computing machine so that this machine is carried out following steps:
Receive first signal of the received IrDA data of indication; And
Response receives described first signal, produces the secondary signal of impelling processor to revive from low-energy state.
Preferably, described machine readable memory also comprise when described processor when described low-energy state is revived, be used for receiving the code of described IrDA data by described processor.
Preferably, described machine readable memory also comprise when described processor when described low-energy state is revived, be used for code by the described IrDA data of described processor processing.
Preferably, described secondary signal is a look-at-me.
Preferably, described machine readable memory also comprises:
Be used for receiving the code of connection request; And
Be used between described processor and described IrDA activated equipment, setting up the code that IrDA is connected.
Preferably, described connection request is serial infrared (SIR) connection request.
Preferably, described machine readable memory also comprises and is used for producing serial infrared (SIR) connection response to respond the code of described connection request.
Preferably, described machine readable memory also comprises and is used for determining whether received code of described serial infrared (SIR) connection response.
Preferably, described machine readable memory also comprises if described serial infrared (SIR) connection response is received, and is used for setting up the code that IrDA connects.
Preferably, described machine readable memory comprises that also the described IrDA data of wait stop.
Preferably, described machine readable memory also comprises the code that is used for starting first counter.
Preferably, described machine readable memory also comprises and is used for determining whether received code of described IrDA data.
Preferably, described machine readable memory also comprises if described IrDA data are received, the code of described first counter that is used for resetting.
Preferably, described machine readable memory also comprises and is used for determining whether described first counter has reached the code of threshold value.
Preferably, described machine readable memory also comprises if described first counter has reached described threshold value, is used for starting the code that described processor enters battery saving mode.
Preferably, described machine readable memory also comprises if described serial infrared (SIR) connection response is not received, is used for increasing the code of second counter.
Preferably, described machine readable memory also comprises and is used for determining whether described second counter reaches the code of maximum count value.
Preferably, described machine readable memory also comprises if reach described maximum count value, is used for producing the code of time-out information.
Preferably, described machine readable memory also comprises if do not reach described maximum count value, is used for sending the code of another serial infrared (SIR) connection request.
From following description and accompanying drawing, these and other advantage of the present invention, aspect and novel features and the details of illustrational embodiment, all will obtain understanding more completely.
Description of drawings
Fig. 1 reduces the structural drawing of example system that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically according to one embodiment of present invention.
Fig. 2 is the sequential chart of message exchange according to an embodiment of the invention, and this information is used in conjunction with reduce the method and system that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically.
Fig. 3 reduces the process flow diagram of exemplary steps that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically according to one embodiment of present invention.
Fig. 4 can be used to reduce the process flow diagram of exemplary steps that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically according to one embodiment of present invention.
Embodiment
Some embodiment of the present invention can find in reduce the method and system of energy consumption that IrDA activates handheld device by opening/closing IrDA port dynamically.In one aspect of the invention, the IrDA activated equipment is designed to by being transformed into sleep pattern during not in active state when it to preserve battery life.When this equipment receives signal, trigger an interruptable controller, this interruptable controller sends a look-at-me and entire equipment is revived to this processor.This wakeup process can spend for example about 8 microseconds, needs for example about 6-8 of cost second and set up an IrDA connection.Therefore, this revives for the preprocessor adequate time and receives data, can not lose any valuable information.
Fig. 1 reduces the structural drawing of example system that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically according to one embodiment of present invention.Referring to Fig. 1, chip 102 comprises processor 104, interruptable controller 106, IrDA transceiver 108 and IrDA interface 110.
This chip 102 can be that for example, one can be used on as the baseband processor chip in the equipment of deferring to GSM/GPRS/EDGE.This chip 102 can be used to provide high-caliber level of integrated system, performance and feature for radio multimedium handheld device of future generation and data module.For low-energy-consumption, accelerator is widely used, so that some necessary computation-intensive function to be provided.This chip 102 can comprise as, the analog-and digital-GSM/GPRS/EDGE Base-Band Processing function on the single CMOS chip.
This processor 104 can be an arm processor for example, or the processor of other adequate types, and is 32 synthetic fully risc processors, is used to monitor whether the activity of IrDA port has data just to be received to check.This IrDA interface 110 can be used to set up infrared the connection between this processor 104 and IrDA transceiver 108.This IrDA transceiver 108 has the input port and the output port of the data RXD that receives being sent back to chip 102 and interruptable controller 106 that receive the data TXD that is transmitted from chip 102.This system enters battery saving mode, as deep sleep mode at operational phase not for a long time.When this system is in battery saving mode, can receive data RXD from this IrDA transceiver.Respond this IrDA transceiver 108 and receive data RXD, this interruptable controller 106 can produce a look-at-me.This look-at-me can impel this processor 104 to revive from low-energy state.When this processor 104 when this low-energy state is revived, can receive and deal with data, do not lose any valuable information.
Fig. 2 is the sequential chart of message exchange according to an embodiment of the invention, and this information is used in conjunction with reduce the method and system that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically.Referring to Fig. 2, at rising edge 202, this signal is transmitted (Tx) to this IrDA transceiver; Be received (Rx) at 204, one signals of negative edge.Serial infrared (SIR) mainly is the RS232 agreement, but has other signal level and pulse length.
Will be when this RF chip to be set up IrDA and is connected when this infrared equipment, this infrared equipment sends a SIR connection request, waits for a SIR connection response.When this IrDA transceiver was received the SIR connection response, this IrDA connection was established.If in short-term, the IrDA transceiver does not receive this SIR connection response, and then this IrDA transceiver sends another request at rising edge 206, waits for this SIR connection response at next negative edge 208 once more.This IrDA transceiver sends as about 6-8 request, and each request spends about 1s period.The sustainable 6-8 of total request time second, and processor can approximately be revived in the 8ms after interruptable controller receives a look-at-me.This revives and prepares for the processor adequate time and has received data from this IrDA transceiver.If this IrDA transceiver does not obtain a response after for example attempting for 6-8 time, then overtime, a timeout signal is generated, and can not communicate by letter with chip 102 to indicate this IrDA transceiver.
Fig. 3 reduces the process flow diagram of exemplary steps that IrDA activates the energy consumption of handheld device by opening/closing IrDA port dynamically according to one embodiment of present invention.Referring to Fig. 3, in step 302, when this system kept segment length period idle, each equipment entered battery saving mode, and sleep pattern for example is to reduce energy consumption.In step 304, when this chip when this IrDA transceiver receives data RXD, response receives data RXD from this IrDA transceiver, interruptable controller produces a look-at-me.In step 306, this look-at-me is revived this processor and this system.In step 308, after this IrDA transceiver sent a SIR connection request and receives a SIR connection response from processor, IrDA connected and is established, and data are processed.In step 310, after this IrDA activity stopped, this system kept wake mode several seconds.In step 312, processor is activated so that system is changed back sleep pattern, receives another look-at-me until it.
Fig. 4 can be used to reduce the process flow diagram of exemplary steps that IrDA activates the energy consumption of handheld device by opening/closing IrDA port rice dynamically according to one embodiment of present invention.Referring to Fig. 4, in step 402, when this system kept segment length period idle, all equipment all was in idle pulley, and system enters battery saving mode, and for example, deep sleep mode is to reduce energy consumption.In step 404, this IrDA transceiver transmits data to chip.In step 406, response receives data from this IrDA transceiver, and interruptable controller produces a look-at-me.In step 408, as the result of the look-at-me of this generation, the signal of reviving is generated, and this signal of reviving can make system and processor revive, shown in step 410.
In step 412, this IrDA transceiver sends a SIR connection request and increases to 1 to this chip and with first counter.In step 414, the IrDA transceiver is waited for the SIR connection response of this chip.In step 416, whether the inspection of IrDA transceiver has received the SIR connection response from chip.If do not receive response, control advances to 418, is increased at this first counter.In step 420, check the value of this first counter, if the value of this first counter equals maximal value, for example 8, then control advances to step 424, produces overtime (TIME OUT) information at this this IrDA transceiver, indicate its can not with this chip communication.
If at this first counter of step 420 less than this maximal value, for example 8, then control proceeds to step 422, sends another SIR connection request at this this IrDA transceiver to chip.In step 414, wait for the SIR connection response of chip.In step 416, if receive the SIR connection response, control proceeds to step 426.This process continues to be reached timeout mode (TIME OUT) by this IrDA transceiver reception or system until a SIR connection response.In step 426, to have set up an IrDA between this processor and the IrDA transceiver and be connected, data are processed in chip.In step 428, system keeps wake states, waits for that the IrDA data stop.In step 432, when this processor stopped to receive the IrDA data, second counter was activated.Whether this systems inspection processor is just receiving any more IrDA data in step 434.If this processor is just receiving any more IrDA data,, wait for that these IrDA data stop at resetting this second counter and get back to step 428 of step 436.If this processor does not receive any more IrDA data, in step 438, this second counter is examined to determine whether it has reached its threshold value.If this second counter does not reach its threshold value, control continues to get back to step 434, determines whether processor is just receiving the IrDA data.If this second counter has reached its threshold value, in step 430, this processor is activated system is transformed into its battery saving mode until receiving another look-at-me.
Therefore, the present invention can realize in the combining of hardware, software or hardware and software.The present invention can realize with concentrated form at least one computer system, or realize with the distribution form that different elements is scattered in several interconnective computer systems.The computer system or the miscellaneous equipment that can be used to carry out any kind of said method all are fit to.A kind of typical hardware can be the general-purpose computing system with computer program with combining of software, when computer program is loaded and be performed, controls this computer system, so that it carries out said method herein.
The present invention also can be embedded in the computer program, and this computer program comprises all features of carrying out method described herein, in the time of in being loaded onto a computer system, can carry out these methods.Computer program herein means that one group of instruction sequence can adopt any expression, any language, code or symbol, the system with information processing capability directly or with following one of the two or the two carry out a specific function: a) convert another kind of language, code or symbol to; B) under different material forms, duplicate.
Though the description of the present invention being carried out with reference to some embodiment, those of ordinary skill in the art should be appreciated that embodiment of the present invention is carried out various changes or equivalence to be replaced and not depart from the scope of the present invention.In addition, for adapting to special situation or material,, do not depart from the scope of the present invention various modifications of the present invention yet.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the claim scope of the present invention.
Related application
The application with reference to, advocate that right of priority and requirement apply on August 16th, 2004, sequence number be _ _ _ _ _ _ _ _ _ _ _ (agency's case number: the benefit of U.S. Provisional Patent Application 15804US01), these applications are by being incorporated into herein with reference to its full text.
Claims (4)
1, a kind of method that reduces the energy consumption of IrDA activated equipment is characterized in that, comprising:
S1 receives first signal of indicating received IrDA data;
S2, response receives described first signal, produces the secondary signal of impelling processor to revive from low-energy state;
S3, when described processor when described low-energy state is revived, set up IrDA and connect, and receive and handle described IrDA data by described processor;
S4 after the intact described IrDA data of described processor processing, does not receive described IrDA data in the IrDA activated equipment keeps the wake mode Preset Time, then start described processor and enter low-yield sleep state.
2, a kind of method that reduces the energy consumption of IrDA activated equipment according to claim 1 is characterized in that, among the step S3, the described IrDA of foundation step of connecting specifically comprises:
S31, the IrDA transceiver sends the SIR connection request and first counter is increased to 1 to the IrDA activated equipment;
S32 waits for the response of IrDA activated equipment to described SIR connection request, if described SIR connection request responds has been received, then set up IrDA and connect, otherwise execution in step S33;
S33, increase described first counter and judge whether the value of described first counter reaches pre-set threshold value, if reach pre-set threshold value, then the IrDA transceiver produces the information that overtime connection disconnects, if do not reach pre-set threshold value, then the IrDA transceiver sends another SIR connection request to the IrDA activated equipment again, and returns step S32.
3, a kind of method that reduces the energy consumption of IrDA activated equipment according to claim 1 is characterized in that, among the step S4, the step after the intact described IrDA data of described processor processing specifically comprises:
S41 waits for when described processor stops to receive the IrDR data, starts second counter;
S42 judges whether described processor is just receiving more IrDA data, if described processor is just receiving more IrDA data, second counter of then resetting, and return step S41, if described processor does not receive any IrDA data, then execution in step S43;
S43 judges whether described second counter reaches pre-set threshold value, enters low-yield sleep state if reach then start described processor, otherwise returns step S42.
4, a kind of method that reduces the energy consumption of IrDA activated equipment according to claim 1 is characterized in that described secondary signal is a look-at-me.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60205704P | 2004-08-16 | 2004-08-16 | |
| US60/602,057 | 2004-08-16 | ||
| US10/926,621 | 2004-08-26 |
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| CN100429682C true CN100429682C (en) | 2008-10-29 |
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| CN101632244B (en) * | 2007-04-18 | 2013-03-06 | 深圳Tcl新技术有限公司 | Electronic equipment capable of receiving control signal and method for processing control signal |
| KR101947652B1 (en) * | 2012-09-28 | 2019-04-25 | 삼성전자 주식회사 | Operation method for low energy blue-tooth communication in terminal and device thereof |
| US9183171B2 (en) * | 2012-09-29 | 2015-11-10 | Intel Corporation | Fast deskew when exiting low-power partial-width high speed link state |
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| EP1089466A1 (en) * | 1999-09-28 | 2001-04-04 | Lucent Technologies Inc. | Infra-red link |
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| EP0772307A1 (en) * | 1995-10-31 | 1997-05-07 | Nokia Mobile Phones Ltd. | Communication protocol for half-duplex traffic |
| WO2000010270A1 (en) * | 1998-08-17 | 2000-02-24 | Calibre, Inc. | System and method for providing an improved standby mode for infrared data transceivers |
| EP1089466A1 (en) * | 1999-09-28 | 2001-04-04 | Lucent Technologies Inc. | Infra-red link |
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