GB2359458A - A battery operated mobile telephone wherein receiving slots of a channel are skipped in idle mode and a communication circuit de energised - Google Patents
A battery operated mobile telephone wherein receiving slots of a channel are skipped in idle mode and a communication circuit de energised Download PDFInfo
- Publication number
- GB2359458A GB2359458A GB0003942A GB0003942A GB2359458A GB 2359458 A GB2359458 A GB 2359458A GB 0003942 A GB0003942 A GB 0003942A GB 0003942 A GB0003942 A GB 0003942A GB 2359458 A GB2359458 A GB 2359458A
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- GB
- United Kingdom
- Prior art keywords
- mobile telephone
- skipping
- control channel
- mode
- mobile
- Prior art date
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- 238000004891 communication Methods 0.000 title claims abstract description 36
- 230000011664 signaling Effects 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims description 14
- 230000007704 transition Effects 0.000 claims description 3
- 108091006146 Channels Proteins 0.000 description 44
- 230000001413 cellular effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000013179 statistical model Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0238—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is an unwanted signal, e.g. interference or idle signal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A battery-operated, mobile telephone and method for use with a base station, which sends each message several times to the mobile telephone so as to increase the probability of receipt thereby. The mobile telephone comprises a slot skipping unit for invoking a skipping mode wherein receiving slots of a mobile control channel are skipped while in idle mode, and a switch coupled to the slot skipping unit for deenergizing a communication circuit of the mobile telephone except during those receiving slots that are not skipped and for energizing said communication circuit when an incoming call is received. Preferably, a coverage characteristic constituted by the signal strength of the mobile control channel and a channel characteristic constituted by the signaling load are monitored and, based on these parameters, the slot skipping unit decides whether or not to invoke slot skipping mode.
Description
2359458 Mobile telephone allowing for reduced battery consumption during
idle mode
FIELD OF THE INVENTION
This invention relates to power conservation in mobile or cellular telephones.
BACKGROUND OF THE INVENTION
Mobile or cellular telephones remain effective only so long as their internal batteries are ffinctional and therefore manufacturers of cellular telephones have invested considerable effort to extending battery life of portable subscriber units. It is known to reduce battery consumption in such units by invoking a so-called "idle mode" during those periods when the unit is waiting for a user input and receiving lo the mobile control channel, while monitoring for incoming calls. Various statistical models have been constructed on the basis of which it has been shown that "idle" mode accounts for approximately 90% of subscriber unit usage. Therefore, much of the battery capacity is wasted in idle mode when most of the time many high power consumption components are not used and processing is minimal. For example, in the Motorola TETRA mobile station, 60% of the battery capacity is spent in the idle mode. Moreover, most of the current drain in idle mode is spent in receiving and processing the mobile channel control in order to establish that no call/signaling was sent to the subscriber unit.
Specifically, in Digital TDMA (Time Division Multiple Access) systems, the main operation of the subscriber unit during idle mode consists in activating in each frame the radio frequency receiver hardware to obtain samples of the mobile channel control slot, further digital processing, demodulation, error checking followed, finally, by data analysis. All this must be done even though the eventual conclusion may be that no message was received.
It is known to reduce battery consumption in cellular telephone subscriber units by reducing the frequency (in terms of how often the circuits are on) with which various circuits within the units are fully energized. For example, US Patent io No. 5,870,389 (Hadar) and assigned to CTP Systems, Ltd. discloses a method and apparatus for reducing power consumed by mobile wireless units, such as personal cominunications systems or wireless PBX telephones, by reducing the frequency with which various circuits within the units are fully energized. During on-going voice communications between a base station and a wireless unit, the wireless unit reduces the frequency of its references to a control channel and may eliminate such references altogether. In addition, while idle, the wireless units may not attempt to reference the control channel during all occurrences of the control chawiel, reducing both power consumption and the possibility of collisions with other wireless units in attempting to access the control channel.
According to US Patent No. 5,870,389, there is provided in a communication system compfising plural base stations communicating with and controlling a plurality of mobile telephones, a method of determining at the mobile telephones with which base station it is to communicate, comprising the steps of.
(One) dividing the communication medium into a time series of repeating frames; (Two) dividing each of the frames into plural slots; (Three) transmitting control information by each of the base stations in a designated one of the slots during each frame; (Four) at the mobile telephone searching at the mobile telephone for the control information being transmitted by each of the base stations; (Five) evaluating a predetermined characteristic of each of the signals having control information; and, (Six) selecting the base station with which to communicate on the basis of the predetermined characteristic.
In such a method, the predetermined characteristic of the base stations is not evaluated by a mobile unit during a frame in which the mobile unit transmits voice data, and the mobile unit reduces its power consumption during the control slot of each frame in which the mobile unit transmits data.
According to a specific embodiment, power is reduced when a portable io telephone is in a "stand-by" mode. In this mode, the portable telephone is energized but voice communications are not occurring, principally while awaiting a new telephone call or for the user to place a telephone call. In the stand-by mode, a portable telephone operating in accordance with the above-described method, does not monitor every frame of the communications but rather monitors every Nth frame and, upon completing the monitoring, reduces the power to the communications circuits and sets a timer to re-power the communications circuits after the passage of N- 1 frames. In this way, communicationpower zonswaption is reduced substantially, whilst allowing the telephone to remain available to Ccanswer" calls and to place calls on user request.
Within the context of such a method for reducing power consumption, it is to be understood that in TDNIA communication systems, a plurality of portable telephones may share a single frequency. A particular frequency or carrier may be divided into multiple slots, typically eight. With proper coordination between a base station and a portable telephone, the latter may expect to receive its digital messages in a specific, predetermined slot - the same slot recurring from one frame to the next. Thus, in each frame, each of a plurality of portable telephones receives a respective parallel communication along the same carrier, in a unique, known slot. In fact, for full duplex communication, two slots are required for each telephone: one for the passage of digital data to the portable telephone and the other for the passage of digital data to the base station.
Thus, the principle of above-mentioned US Patent No. 5,870,389 is based on dedicating one slot in each frame for the transmission of control information and each of the portable telephones searching for the control information transmitted by each base station. Based on the control information thus received, a mobile telephone can determine with which base station to communicate - typically the nearest based on the signal strength of the received signal. The base station determines which slots and frequencies are available and retums a message to the portable telephone identifying the slot and frequency to be used by the portable telephone as a voice channel. By remaining in the same voice channel so long as lo the channel has acceptable communications, the portable telephone typically does not need to monitor the control channel during a telephone call. Because the assigned slot occurs at a known repetition rate, during a voice communication the portable unit may deenergize its communication circuits except during the slot in which it is communicating. By such means, battery consumption may be reduced significantly.
It is apparent that such energy conservation requires the establishment of a predetermined communications protocol between the base stations and each of the portable telephones, in order that each base station be able to manage the mechanism for allocating an appropriate slot for communicating with each mobile unit. Furthermore, additional signaling is required for the transmission of control information and the system lacks flexibility.
It would clearly be desirable to provide an improved mechanism that allows a mobile telephone unit to deenergize its communication circuits when in idle mode except for periodic checking of an incoming signal and to remain energized only on detection of an incoming signal.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method for allowing a mobile telephone unit to deenergize its communication circuits during idle mode in a manner that is independent of the base station.
According to a broad aspect of the invention there is provided in a communication system for effecting communication between a base station and a battery-operated, mobile telephone, wherein each message is sent several times by the base station to the mobile telephone so as to increase the probability of receipt thereby, a method for reducing battery consumption of the mobile telephone during idle mode, said method comprising the following steps all carried out by the mobile telephone:
(One)skipping receiving slots on a mobile control channel while in idle mode and deenergizing a communication circuit of the mobile telephone except during those receiving slots that are not skipped, and (Two) energizing said communication circuit when an incoming call is received.
According to a preferred embodiment, the method of skipping receiving slots comprises:
(One)while in idle mode, monitoring all receiving slots so as to determine a coverage characteristic of the mobile control channel, (Two) while in idle mode, monitoring a channel characteristic of the mobile control channel, (Three) using the coverage characteristic of the mobile control channel and the channel characteristic, determining whether to invoke a skipping mode wherein some of the receiving slots are skipped and, if so:
a) skipping receiving slots and remaining deenergized except during those receiving slots that are to be monitored, and b) repeating steps (a) and (b) until an incoming call is received or until a signaling transition is initiated whereupon skipping mode is canceled; and (Four) if skipping mode is not required, reverting to normal operation.
Preferably, the coverage characteristic is the signal strength of the mobile control channel and the channel characteristic is the signaling load thereof.
BRIEF DESCRIPTION OF THE DRAWINGS In order to understand the invention and to see how it may be carried out in practice, a preferred embodiment will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which: 5 Fig. 1 is a flow diagram showing a method for a mobile telephone to skip receiving slots on a mobile control channel while in idle mode; and Fig. 2 is a block diagram showing functionally a control unit for enabling a mobile telephone to skip receiving slots on a mobile control channel while in idle mode.
io DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Fig. 1 shows the principal steps performed by a mobile telephone in a communication system for effecting communication with a base station for skipping receiving slots on a mobile control channel while in idle mode. It is assumed that each message sent by the base station is repeated and that, in consequence, there exists some redundancy. As will be explained, the invention exploits this redundancy to avoid monitoring each successive incoming message slot and therefore allows the receiving circuits to be deenergized for some of the receiving slots, whilst still receiving the message in at least one of the receiving slots which is monitored. By such means, battery saving is accomplished.
To achieve this, the mobile telephone performs the following steps:
(One)while in idle mode, monitoring all receiving slots so as to determine a signal strength characteristic of the mobile control channel, (Two) while in idle mode, monitoring a signaling load on the mobile control channel, (Three) using the signal strength characteristic of the mobile control channel and the signaling load, determining whether to invoke a skipping mode wherein some of the receiving slots are skipped and, if so:
b) a) skipping receiving slots and remaining deenergized except during those receiving slots that are to be monitored, and repeating steps (a) and (b) until an incoming call is received or until a signaling transition is initiated whereupon skipping mode is canceled; and (Four) if skipping mode is not required, reverting to normal operation.
The signal strength characteristic is indicative of channel coverage and may be either the RSSI (Received Signal Strength Indication) and/or the signal quality estimation. The base station signaling is designed to overcome fadings and to io permit communication while achieving some declared performance even if the mobile telephone is at the cell edge coverage. Such design implies sending the mobile channel signaling messages several times. If the measured signal strength characteristic indicates that the mobile telephone is considerably above the low performance threshold, this means that some of the signaling information is redundant and can be ignored by the mobile telephone. Therefore, invoking skipping mode is no different to the situation that would obtain if several slots were lost, thus maintaining system performance.
The signaling load constitutes a channel characteristic, which may be monitored so as to enable the mobile telephone to determine how sensitive the mobile control channel is to an increase in the necessary signaling required to be sent. It should be understood in this context that usually messages sent by the base station must be acknowledged by the receiving mobile telephone. In such case, the base station sends each message several times until the mobile telephone returns an acknowledge signal. Therefore, the sooner an acknowledge signal is received by the base station, the fewer is the number of repeated messages that need to be sent. It thus follows that skipping slots causes a statistical increase in the need for the base station to send repeated messages. Thus, monitoring the signaling load ensures that the artificial increase in the mobile channel signaling during skipping mode (owing to the need for the base station to send repeated signals) will not cause undue degradation of the overall system performance.
The invention also contemplates the situation where the base station does not require acknowledgement by the receiving mobile telephone. Such is the case, for example, particularly for group or conference calls where it is normal for the base station to send each message a specified number of times, commonly three. The same information is then sent at a decreasing rate and is called "late entry information". It may thus be assumed that at least one of the messages will be received. Here, too, the redundancy inherent in the repeated signaling may be exploited to allow for slot skipping and consequent battery saving.
In deciding which slots to skip, several approaches may be adopted. The io mobile telephone can skip a predetermined number of specific slots whose sequence is thus also fixed in advance. Thus, for example, alternate slots can be skipped. Alternatively, a predetermined number of slots can.be skipped whilst selecting which slots to skip randomly. It is also possible for the number of slots to be skipped to vary randomly from one frame to another.
Fig. 2 shows functionally a battery-operated, mobile telephone 10 according to the invention, comprising a slot skipping unit 11 for invoking a skipping mode wherein receiving slots of a mobile control channel are skipped while in idle mode, and a switch 12 coupled to the slot skipping unit 11 for deenergizing a communication circuit 13 of the mobile telephone except during those receiving slots that are not skipped and for energizing said communication circuit when an incoming call is received. The mobile telephone 10 further comprises a mode detector 14 for detecting whether the mobile telephone is in idle mode, and a coverage module 15 coupled to the mode detector 14 for monitoring all receiving slots while in idle mode, so as to determine a coverage characteristic of the mobile control channel. A channel characteristic module 16 is likewise coupled to the mode detector 14 for monitoring a channel characteristic of the mobile control channel while in idle mode. The slot skipping unit 11 is coupled to the coverage module 15 and to the channel characteristic module 16 and is responsive to the coverage characteristic of the mobile control channel and the channel characteristic, for deter-mining whether to invoke said skipping mode.
k Preferably, the coverage module 15 includes a signal strength detector 17 for determining signal strength of the mobile control channel, and the channel characteristic module 16 includes a load detector 18 for determining a signaling load of the mobile control channel.
If desired, the slot skipping unit 11 may include a random slot unit 19 for skipping randomly selected slots during skipping mode.
The invention thus allows a mobile telephone to skip slots so as to reduce battery consumption of the mobile telephone, in a manner that is independent of, and completely transparent to, the base station. By adopting the algorithm io according to the invention, the probability of maintaining a required system performance is high. That is to say, the probability of not receiving an individual call is low. Moreover, for group calls, this probability is even lower owing to the late entry information, which continues to be sent on the mobile control channel.
It will be appreciated that modifications may be made without departing from the scope of the invention as defined in the attached claims. For example, whilst in the preferred embodiment, received signal strength is used as an indication of the potential for redundancy, any other parameter representative of coverage may equally well be employed. Likewise, whilst in the preferred embodiment signaling load is used as an indication as to how sensitive the mobile control channel is to an increase in the necessary signaling required to be sent, other suitable parameters representative of channel coverage are also contemplated. Thus, for example, empty slots or new calls ratio can also be used as indications of channel coverage.
In the method claims that follow, alphabetic characters used to designate claim steps are provided for convenience only and do not imply any particular order of performing the steps.
Claims (11)
1. In a communication system for effecting communication between a base station and a battery-operated, mobile telephone, wherein each message is sent several times by the base station to the mobile telephone so as to increase the probability of receipt thereby, a method for reducing battery consumption of the mobile telephone during idle mode, said method comprising the following steps all carried out by the mobile telephone:
(One)skipping receiving slots on a mobile control channel while in idle mode and deenergizing a communication circuit of the mobile telephone except during those receiving slots that are not skipped, and - (Two) energizing said communication circuit when an incoming call is received.
2. In a communication system for effecting communication between a base station and a battery-operated, mobile telephone, wherein each message is sent several times by the base station to the mobile telephone so as to increase the probability of receipt thereby, a method for skipping receiving slots on a mobile control channel while in idle mode, said method comprising the following steps all carried out by the mobile telephone:
(One)while in idle mode, monitoring all receiving slots so as to determine a coverage characteristic of the mobile control channel, (Two) while in idle mode, monitoring a channel characteristic of the mobile control channel, (Three) using the coverage characteristic of the mobile control channel and the channel characteristic, determining whether to invoke a skipping mode wherein some of the receiving slots are skipped and, if so:
a) skipping receiving slots and remaining deenergized except during those receiving slots that are to be monitored, and b) repeating steps (a) and (b) until an incoming call is received or until a signaling transition is initiated whereupon skipping mode is canceled; and (Four) if skipping mode is not required, reverting to normal operation.
3. The method according to Claim 2, wherein in skipping mode alternate slots are skipped.
4. The method according to Claim 2, wherein in skipping mode random slots are skipped.
5. The method according to any one of the preceding claims, wherein the coverage characteristic is a signal strength of the mobile control channel.
6. The method according to any one of the preceding claims, wherein the channel characteristic is a signaling load of the mobile control channel.
io
7. A battery-operated, mobile telephone for use with a base station, which sends each message several times to the mobile telephone so as to increase the probability of receipt thereby, said mobile telephone comprising: a slot skipping unit for invoking a skipping mode wherein receiving slots of a mobile control channel are skipped while in idle mode, and 15 a switch coupled to the slot skipping unit for deenergizing a communication circuit of the mobile telephone except during those receiving slots that are not skipped and for energizing said communication circuit when an incoming call is received.
8. The mobile telephone according to Claim 7, further comprising: 20 a mode detector for detecting whether the mobile telephone is in idle mode, a coverage module coupled to the mode detector for monitoring all receiving slots while in idle mode, so as to determine a coverage characteristic of the mobile control channel, and a channel characteristic module coupled to the mode detector for monitoring a channel characteristic of the mobile control channel while in idle mode; said slot skipping unit being coupled to the coverage module and to the channel characteristic module and being responsive to the coverage characteristic of the mobile control channel and the channel characteristic, for determining whether to invoke said skipping mode.
9. The mobile telephone according to Claim 8, wherein the coverage module includes a signal strength detector for determining signal strength of the mobile control channel.
10. The mobile telephone according to Claim 8 or 9, wherein the channel characteristic module includes a load detector for determining a signaling load of the mobile control channel.
11. The mobile telephone according to any one of Claims 7 to 10, wherein the io slot skipping unit includes a random slot unit for skipping randomly selected slots during skipping mode.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0003942A GB2359458A (en) | 2000-02-18 | 2000-02-18 | A battery operated mobile telephone wherein receiving slots of a channel are skipped in idle mode and a communication circuit de energised |
| PCT/IB2001/000215 WO2001062028A1 (en) | 2000-02-18 | 2001-02-19 | Mobile telephone allowing for reduced battery consumption during idle mode |
| AU2001235883A AU2001235883A1 (en) | 2000-02-18 | 2001-02-19 | Mobile telephone allowing for reduced battery consumption during idle mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0003942A GB2359458A (en) | 2000-02-18 | 2000-02-18 | A battery operated mobile telephone wherein receiving slots of a channel are skipped in idle mode and a communication circuit de energised |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0003942D0 GB0003942D0 (en) | 2000-04-12 |
| GB2359458A true GB2359458A (en) | 2001-08-22 |
Family
ID=9886011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0003942A Withdrawn GB2359458A (en) | 2000-02-18 | 2000-02-18 | A battery operated mobile telephone wherein receiving slots of a channel are skipped in idle mode and a communication circuit de energised |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2001235883A1 (en) |
| GB (1) | GB2359458A (en) |
| WO (1) | WO2001062028A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2414362A (en) * | 2004-05-18 | 2005-11-23 | Motorola Inc | Synchronisation of mobile devices communicating in a direct mode of operation |
| EP2136588A1 (en) * | 2008-06-19 | 2009-12-23 | EADS Secure Networks Oy | Control mechanism for common control channel use |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2410654B (en) * | 2004-01-28 | 2006-11-29 | Motorola Inc | A mobile station and a method of operation of the mobile station in which a receiver of the mobile station is selectively in a reduced activity state |
| US8441971B2 (en) | 2004-12-21 | 2013-05-14 | Intel Corporation | Idle state management |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150361A (en) * | 1989-01-23 | 1992-09-22 | Motorola, Inc. | Energy saving protocol for a TDM radio |
| EP0536099A1 (en) * | 1991-10-04 | 1993-04-07 | Telefonaktiebolaget Lm Ericsson | A method for avoiding an unnecessarily high energy consumption in mobile stations of a mobile telephone system |
| WO1999031811A1 (en) * | 1997-12-12 | 1999-06-24 | Thomson Licensing S.A. | Power saving protocol for tdma multi-line wireless telephone handsets |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU655219B2 (en) * | 1990-11-26 | 1994-12-08 | Motorola, Inc. | Method and apparatus for paging in a communication system |
| US6240288B1 (en) * | 1998-04-07 | 2001-05-29 | Conexant Systems, Inc. | Power management system for a mobile unit by intelligent page monitoring |
-
2000
- 2000-02-18 GB GB0003942A patent/GB2359458A/en not_active Withdrawn
-
2001
- 2001-02-19 WO PCT/IB2001/000215 patent/WO2001062028A1/en not_active Ceased
- 2001-02-19 AU AU2001235883A patent/AU2001235883A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150361A (en) * | 1989-01-23 | 1992-09-22 | Motorola, Inc. | Energy saving protocol for a TDM radio |
| EP0536099A1 (en) * | 1991-10-04 | 1993-04-07 | Telefonaktiebolaget Lm Ericsson | A method for avoiding an unnecessarily high energy consumption in mobile stations of a mobile telephone system |
| WO1999031811A1 (en) * | 1997-12-12 | 1999-06-24 | Thomson Licensing S.A. | Power saving protocol for tdma multi-line wireless telephone handsets |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2414362A (en) * | 2004-05-18 | 2005-11-23 | Motorola Inc | Synchronisation of mobile devices communicating in a direct mode of operation |
| GB2414362B (en) * | 2004-05-18 | 2006-10-04 | Motorola Inc | Wireless communication unit and method for acquiring synchronisation therein |
| EP2136588A1 (en) * | 2008-06-19 | 2009-12-23 | EADS Secure Networks Oy | Control mechanism for common control channel use |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2001235883A1 (en) | 2001-08-27 |
| WO2001062028A1 (en) | 2001-08-23 |
| GB0003942D0 (en) | 2000-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |