WO2007082934A1 - Method for dynamically adapting the drx cycle length in a radio communications system - Google Patents

Method for dynamically adapting the drx cycle length in a radio communications system Download PDF

Info

Publication number
WO2007082934A1
WO2007082934A1 PCT/EP2007/050538 EP2007050538W WO2007082934A1 WO 2007082934 A1 WO2007082934 A1 WO 2007082934A1 EP 2007050538 W EP2007050538 W EP 2007050538W WO 2007082934 A1 WO2007082934 A1 WO 2007082934A1
Authority
WO
WIPO (PCT)
Prior art keywords
cycle length
user terminal
drx
radio communications
drx cycle
Prior art date
Application number
PCT/EP2007/050538
Other languages
French (fr)
Inventor
Volker Breuer
Norbert Kroth
Original Assignee
Nokia Siemens Networks Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Gmbh & Co. Kg filed Critical Nokia Siemens Networks Gmbh & Co. Kg
Publication of WO2007082934A1 publication Critical patent/WO2007082934A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H04B1/1615—Switching on; Switching off, e.g. remotely
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving 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
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted 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

Definitions

  • the present invention relates to a method for dynamically adapting the DRX (Discontinuous Reception) cycle length in a radio communications system.
  • DRX Continuous Reception
  • 3G radio communications systems like e.g. UMTS
  • 3G radio communications systems like e.g. UMTS
  • a common way to save battery power and trigger state changes from inactive to active state is to use a paging mechanism wherein the user terminal periodically monitors a base station' s paging channel in order to identify that it has to turn on its receiver in order to fetch transmitted data. If a DRX mechanism is applied together with paging, an optimised battery power utilisation can be achieved allowing a tradeoff between activation time and power consumption at the user terminal .
  • the proposed technique provides for an efficient and simple control of a user terminal's battery power.
  • Said independent method controls a discontinuous reception cycle length of a user terminal in a radio communications system, wherein the cycle length is dynamically adapted depending on connection and/or terminal related parameters.
  • Said independent user terminal of a radio communications system comprises means for dynamically adapting a discontinuous reception cycle length depending on connection and/or terminal related parameters.
  • the nowadays static DRX cycle length is dynamically adapted to the user terminal' s behaviour, services and/or user characteristics in order to better match the time of inactivity from services perspective to the periodicity where the user terminal monitors the paging channel for detection of triggers for a state transition .
  • the DRX cycle length is dynamically adapted based on history/statistics and other information by
  • Fig. 1 shows a DRX cycle length adaptation scheme based on data throughput .
  • Fig. 2 shows an exemplary variation of the DRX cycle length over time for a user terminal.
  • Fig. 3 shows a DRX cycle length adaptation scheme based on packet-arrival-rate .
  • Fig. 4 shows an exemplary embodiment depicting the different means used to implement the inventive technique.
  • Fig. 1 shows a DRX cycle length adaptation scheme based on data throughput.
  • the exemplary scheme is based on data throughput wherein the DRX cycle length is continuously adapted for a particular user.
  • the process is characterised by two phases: a DRX Increase Phase and a DRX Decrease Phase.
  • the cycle length will be increased in case the user has received a service where high throughput (e.g. good peak to average ratio) has been achieved in active state.
  • high throughput e.g. good peak to average ratio
  • the user terminal is in a good radio condition where a longer paging period may be compensated with high peak data rate for successive transmissions.
  • the cycle length decreases in case the user terminal has re ⁇ ceived a service where low data throughput (e.g. bad peak to average ratio) has been achieved in active state.
  • low data throughput e.g. bad peak to average ratio
  • the gradient for increasing or decreasing the cycle length is defined by discrete curves, as shown in fig. 1 for three dif- ferent situations, high, medium, low throughput.
  • the new DRX cycle length can thus be calculated based on the current (stored) cycle length value which is used as an input parame ⁇ ter for the calculation of a new value according to the following DRX-formula.
  • New DRX cycle length f (current DRX cycle length, data throughput)
  • the DRX cycle length value would be continuously updated in case the user terminal changes from active to idle state, as shown for example in fig. 2.
  • Fig. 2 shows an exemplary variation of the DRX cycle length over time for a user terminal.
  • the example of fig. 3 shows a DRX cycle length adaptation scheme based on packet-arrival-rate, continuously adapting the DRX cycle length for a particular user terminal.
  • the DRX cycle length is increased if the last idle period was longer than the previous one, thus resulting in a lower packet arrival rate.
  • the DRX cycle length is de ⁇ creased.
  • the gradient for increasing or decreasing the cycle length is defined by discrete curves for the three dif ⁇ ferent situations, high, medium and low arrival-rate.
  • the new DRX cycle length will now be calculated based on the current (stored) cycle length value which is used as an input parame ⁇ ter in the calculation of the new value according to the DRX- formula below.
  • New DRX cycle length f (current DRX cycle length, packet- arrival-rate)
  • a "DRX evaluation window" based on multiple individual "DRX evaluation periods” (arbitrary idle period) may be used to adapt the DRX cycle length to a cumulated packet-arrival-rate, as shown in fig. 2.
  • the new DRX cycle length may be calcu ⁇ lated according to the following DRX-formula.
  • New DRX cycle length f (current DRX cycle length, packet- arrival-rate [DRX Evaluation Window] )
  • the maximum DRX cycle may be a parameter sig ⁇ nalled by the network or the base station to the user terminal, wherein the parameter is dimensioned depending on the operation environment the user is currently in.
  • the maximum value of the cycle length may also vary, for example depending on the cell environment (macro, micro, pico cells), terminal capacity and/or maximum expected user terminal speed, etc.
  • a radio communications system 1000 comprising of a plurality of base stations (BSs) 100 and a plurality of user terminals 10.
  • BS 100 and user terminal 10 communicate and exchange data over a connection C.
  • User terminal 10 comprises of means 11 adapted for dynamically adapting a discontinuous reception cycle length depending on connection and/or user terminal 10 related parameters as already mentioned herein above.
  • User terminal 10 also comprises of further means 12 adapted for receiving the at least one parameter transmitted from a base station 100 of the radio communications system 1000. Means 12 are also further adapted to transmit over a plurality of channels to base station 100. Means 11 are also further arranged to control the functioning of user terminal 10 and to execute any further operations required. User terminal 10 also comprises of means 13 arranged to store data, such as the different connection and/or user terminal 10 related parameters, cycle lengths, reception evaluation periods etc.
  • the different means can be implemented in at least one of the following: a microcomputer, an integrated circuit, a microprocessor .
  • Base station 100 comprises of means 101 arranged to control the functioning of the base station 100, and, means 102 arranged to transmit and to receive transmissions from user terminal 10.
  • the different means can also be implemented in at least one of the following: a microcomputer, an integrated circuit, a microprocessor.
  • paging/DRX mechanism e.g. packet-arrival-rate, pre-defined service scheduling
  • radio characteristics/conditions e.g. throughput

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

According to the invention, a cycle length of a discontinuous reception (DRX) at a user terminal is dynamically adapted depending on connection and/or terminal related parameters.

Description

Title of the invention
Method for dynamically adapting the DRX cycle length in a ra¬ dio communications system
Field of the invention
The present invention relates to a method for dynamically adapting the DRX (Discontinuous Reception) cycle length in a radio communications system.
Summary of the invention
One of the most important requirements for the evolution of third generation (3G) radio communications systems, like e.g. UMTS, are efficient usage of battery power and short transition times (i.e. low C-plane latency) between inactive idle state and active state at the user terminal. A common way to save battery power and trigger state changes from inactive to active state is to use a paging mechanism wherein the user terminal periodically monitors a base station' s paging channel in order to identify that it has to turn on its receiver in order to fetch transmitted data. If a DRX mechanism is applied together with paging, an optimised battery power utilisation can be achieved allowing a tradeoff between activation time and power consumption at the user terminal .
However, current systems only use a fixed value for the DRX cycles length (e.g. in 3G: one for CS (Circuit Switched), one for PS (Packet Switched) domain) which does not cope well with "real-world-usage-scenarios". Applying a fixed cycle length could lead to a situation where new data arrives at the radio access network just after the user terminal has finished reading the paging channel. This means, for indicating this event to the user terminal the network has to wait almost an entire DRX cycle, which could last up to several seconds paging delay (e.g. up to 5 seconds in 3G) . On the other hand, making the DRX cycle length shorter will result in a faster draining of the user terminal's battery. Especially, this would be highly inefficient in cases where a few short data packets are transmitted rather infrequently.
A need therefore exists for a technique that resolves the above mentioned issues and ensures that the power of a user terminal' s battery is efficiently controlled and not wasted.
With the present invention the above mentioned issues are resolved. The proposed technique provides for an efficient and simple control of a user terminal's battery power.
The technique is achieved by the teaching contained in the independent claims. Further advantageous embodiments can be seen in the dependent claims .
Said independent method controls a discontinuous reception cycle length of a user terminal in a radio communications system, wherein the cycle length is dynamically adapted depending on connection and/or terminal related parameters.
Said independent user terminal of a radio communications system, comprises means for dynamically adapting a discontinuous reception cycle length depending on connection and/or terminal related parameters.
According to the present invention, the nowadays static DRX cycle length is dynamically adapted to the user terminal' s behaviour, services and/or user characteristics in order to better match the time of inactivity from services perspective to the periodicity where the user terminal monitors the paging channel for detection of triggers for a state transition . Furthermore, the DRX cycle length is dynamically adapted based on history/statistics and other information by
1. taking performance/service characteristics into account (data throughput [peak, average] , data rate, data arrival rate [measured over a certain time period] , known/estimated service scheduling times, etc.), and/or
2. taking user terminal/environment/user related aspects into account (terminal capability, operation environment [fixed installation], velocity, etc.).
Short description of the drawings
The present invention will become more fully apparent from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
Fig. 1 shows a DRX cycle length adaptation scheme based on data throughput .
Fig. 2 shows an exemplary variation of the DRX cycle length over time for a user terminal.
Fig. 3 shows a DRX cycle length adaptation scheme based on packet-arrival-rate .
Fig. 4 shows an exemplary embodiment depicting the different means used to implement the inventive technique.
Detailed description of the invention
Fig. 1 shows a DRX cycle length adaptation scheme based on data throughput. The exemplary scheme is based on data throughput wherein the DRX cycle length is continuously adapted for a particular user. The process is characterised by two phases: a DRX Increase Phase and a DRX Decrease Phase.
According to this scheme, the cycle length will be increased in case the user has received a service where high throughput (e.g. good peak to average ratio) has been achieved in active state. Here it is assumed that the user terminal is in a good radio condition where a longer paging period may be compensated with high peak data rate for successive transmissions. The cycle length decreases in case the user terminal has re¬ ceived a service where low data throughput (e.g. bad peak to average ratio) has been achieved in active state. Here it is assumed that the user is in a bad radio condition where a short paging period is necessary because buffered data for successive transmissions (which triggered the paging) cannot be quickly transmitted over the air interface.
The gradient for increasing or decreasing the cycle length is defined by discrete curves, as shown in fig. 1 for three dif- ferent situations, high, medium, low throughput. The new DRX cycle length can thus be calculated based on the current (stored) cycle length value which is used as an input parame¬ ter for the calculation of a new value according to the following DRX-formula.
New DRX cycle length = f (current DRX cycle length, data throughput)
In such a mode of operation, the DRX cycle length value would be continuously updated in case the user terminal changes from active to idle state, as shown for example in fig. 2.
Fig. 2 shows an exemplary variation of the DRX cycle length over time for a user terminal.
As mentioned above, in addition to "data throughput" parame¬ ter in the DRX-formula many other input parameters like e.g. "packet-arrival-rate" may also be taking into account, which determines the period after the last transmitted packet and before a new data packet arrives .
The example of fig. 3 shows a DRX cycle length adaptation scheme based on packet-arrival-rate, continuously adapting the DRX cycle length for a particular user terminal.
According to this scheme, the DRX cycle length is increased if the last idle period was longer than the previous one, thus resulting in a lower packet arrival rate. In case the last idle period was shorter than the one before, i.e. a higher packet-arrival-rate, the DRX cycle length is de¬ creased.
In fig. 3, the gradient for increasing or decreasing the cycle length is defined by discrete curves for the three dif¬ ferent situations, high, medium and low arrival-rate. The new DRX cycle length will now be calculated based on the current (stored) cycle length value which is used as an input parame¬ ter in the calculation of the new value according to the DRX- formula below.
New DRX cycle length = f (current DRX cycle length, packet- arrival-rate)
However, in order to obtain better statistical results on the fluctuation of the period after the last transmitted packet and before a new data packet arrives (idle period) , it would be beneficial to also take into account the history of packet-arrival-rates. For this purpose, a "DRX evaluation window" based on multiple individual "DRX evaluation periods" (arbitrary idle period) may be used to adapt the DRX cycle length to a cumulated packet-arrival-rate, as shown in fig. 2. As a consequence, the new DRX cycle length may be calcu¬ lated according to the following DRX-formula. New DRX cycle length = f (current DRX cycle length, packet- arrival-rate [DRX Evaluation Window] )
It is of course also possible to combine different types of parameters in the DRX-formula, such as throughput and arri¬ val-rate. Furthermore, it should even be possible to combine a continuous calculation of the cycle length with an a-priori knowledge about scheduling times of services (e.g. frequent scheduled news service) . For this purpose, the a-priori knowledge would interrupt the continuous DRX process.
Additionally, by taking into account also information on the terminal, environment and/or user, it would be possible to configure short DRX cycle lengths for fixed installations, because battery power is not an issue.
Furthermore, the maximum DRX cycle may be a parameter sig¬ nalled by the network or the base station to the user terminal, wherein the parameter is dimensioned depending on the operation environment the user is currently in. In different scenarios, the maximum value of the cycle length may also vary, for example depending on the cell environment (macro, micro, pico cells), terminal capacity and/or maximum expected user terminal speed, etc.
In fig. 4, a further exemplary embodiment is depicted showing the different means that can be used to implement the inventive technique. Fig. 4 depicts a radio communications system 1000 comprising of a plurality of base stations (BSs) 100 and a plurality of user terminals 10. For ease of understanding of the inventive technique only one base station 100 and one user terminal 10 are shown. In fig. 4, BS 100 and user terminal 10 communicate and exchange data over a connection C. Nevertheless, a person skilled in the art would be aware that in such a radio communications system 1000, there exist more of these devices. User terminal 10 comprises of means 11 adapted for dynamically adapting a discontinuous reception cycle length depending on connection and/or user terminal 10 related parameters as already mentioned herein above. User terminal 10 also comprises of further means 12 adapted for receiving the at least one parameter transmitted from a base station 100 of the radio communications system 1000. Means 12 are also further adapted to transmit over a plurality of channels to base station 100. Means 11 are also further arranged to control the functioning of user terminal 10 and to execute any further operations required. User terminal 10 also comprises of means 13 arranged to store data, such as the different connection and/or user terminal 10 related parameters, cycle lengths, reception evaluation periods etc. The different means can be implemented in at least one of the following: a microcomputer, an integrated circuit, a microprocessor .
Base station 100 comprises of means 101 arranged to control the functioning of the base station 100, and, means 102 arranged to transmit and to receive transmissions from user terminal 10. The different means can also be implemented in at least one of the following: a microcomputer, an integrated circuit, a microprocessor.
Advantages of the present invention are the following:
- optimal adaptation of paging/DRX mechanism to service characteristics (e.g. packet-arrival-rate, pre-defined service scheduling) , - optimal adaptation of paging/DRX mechanism to radio characteristics/conditions (e.g. throughput),
- optimal adaptation/configuration of paging/DRX mechanism based on terminal/environment/user aspects (e.g. fixed installation, mobile) , - optimised utilisation of the terminal' s battery power with fastest possible state switching (lowest C-plane latency for idle-active transition) , - increased system efficiency and user satisfaction, and
- maintained network and operator control due to maximum DRX cycle being a signalled parameter.
Although the invention has been described in terms of a preferred embodiment described herein, those skilled in the art will appreciate other embodiments and modifications which can be made without departing from the scope of the teachings of the invention. All such modifications are intended to be included within the scope of the claims appended hereto.

Claims

Patent claims
1. Method for controlling a discontinuous reception (DRX) cycle length of a user terminal in a radio communications sys- tern, wherein the cycle length is dynamically adapted depend¬ ing on connection and/or user terminal related parameters.
2. Method according to claim 1, wherein the connection parameters are at least one of performance characteristics, service characteristics, data throughput, data rate, data arrival rate, service scheduling times.
3. Method according to claim 1 or 2, wherein the terminal related parameters are at least one of user terminal capacity, operation environment, cell size, user terminal speed.
4. Method according to one of the preceding claims, wherein a gradient for increasing and/or decreasing the cycle length is described by discrete curves for different parameters.
5. Method according to one of the preceding claims, wherein when adapting the cycle length, a previous cycle length is taken into account .
6. Method according to one of the preceding claims, wherein when adapting the cycle length, an evaluation window containing a number of discontinuous reception evaluation periods is considered.
7. User terminal (10) of a radio communications system (1000), comprising means (11) for dynamically adapting a discontinuous reception cycle length depending on connection and/or user terminal (10) related parameters.
8. User terminal (10) according to claim 7, comprising means (12) for receiving the at least one parameter from a base station (100) of the radio communications system (1000) .
PCT/EP2007/050538 2006-01-20 2007-01-19 Method for dynamically adapting the drx cycle length in a radio communications system WO2007082934A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP06001260 2006-01-20
EP06001260.6 2006-01-20
EP06020702.4 2006-10-02
EP06020702 2006-10-02

Publications (1)

Publication Number Publication Date
WO2007082934A1 true WO2007082934A1 (en) 2007-07-26

Family

ID=37845333

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/050538 WO2007082934A1 (en) 2006-01-20 2007-01-19 Method for dynamically adapting the drx cycle length in a radio communications system

Country Status (1)

Country Link
WO (1) WO2007082934A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2450167A (en) * 2007-06-18 2008-12-17 Nec Corp Discontinuous Reception In A Mobile Radio Communications Network
WO2009100136A2 (en) * 2008-02-04 2009-08-13 Qualcomm Incorporated Suitable trigger mechanism to control new cell identification in ue when in drx mode
US8089739B2 (en) 2007-10-30 2012-01-03 Agere Systems Inc. Electrostatic discharge protection circuit
WO2012065914A1 (en) 2010-11-15 2012-05-24 Research In Motion Limited Managing wireless communications
WO2012065915A1 (en) * 2010-11-15 2012-05-24 Research In Motion Limited Managing wireless communications
WO2013044415A1 (en) * 2011-09-30 2013-04-04 Nokia Siemens Networks Oy Discontinuous reception
WO2013006381A3 (en) * 2011-07-01 2013-05-10 Intel Corporation User equipment initiated discontinuous operation in a wireless communications network
US8937876B2 (en) 2010-11-15 2015-01-20 Blackberry Limited Managing communications across a wireless network
US9225759B2 (en) 2012-01-27 2015-12-29 Intel Corporation User equipment and method for discontinuous reception (DRX) mode in wireless communication networks
US9693299B2 (en) 2009-11-30 2017-06-27 Nokia Technology Oy Method and apparatus for power saving operations in wireless network elements
JP2018522439A (en) * 2015-05-04 2018-08-09 クアルコム，インコーポレイテッド Inter-node coordination to manage the modem processing pipeline

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627836A2 (en) * 1993-06-02 1994-12-07 Koninklijke Philips Electronics N.V. Enhanced power saving method for handhold communication system and the handhold communication system thereof
US20030185162A1 (en) * 2002-03-28 2003-10-02 General Motors Corporation Method and system for dynamically determining sleep cycle values in a quiescent mobile vehicle
EP1499144A1 (en) * 2003-07-18 2005-01-19 Kabushiki Kaisha Toshiba Mobile communication terminal and discontinuous reception method thereof
EP1613107A2 (en) * 1998-10-15 2006-01-04 Telefonaktiebolaget L M Ericsson (Publ) A variable sleep mode for mobile stations in a mobile communications network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627836A2 (en) * 1993-06-02 1994-12-07 Koninklijke Philips Electronics N.V. Enhanced power saving method for handhold communication system and the handhold communication system thereof
EP1613107A2 (en) * 1998-10-15 2006-01-04 Telefonaktiebolaget L M Ericsson (Publ) A variable sleep mode for mobile stations in a mobile communications network
US20030185162A1 (en) * 2002-03-28 2003-10-02 General Motors Corporation Method and system for dynamically determining sleep cycle values in a quiescent mobile vehicle
EP1499144A1 (en) * 2003-07-18 2005-01-19 Kabushiki Kaisha Toshiba Mobile communication terminal and discontinuous reception method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TAO ZHENG ET AL: "PMAC: An Adaptive Energy-Efficient MAC Protocol for Wireless Sensor Networks", PARALLEL AND DISTRIBUTED PROCESSING SYMPOSIUM, 2005. PROCEEDINGS. 19TH IEEE INTERNATIONAL DENVER, CO, USA 04-08 APRIL 2005, PISCATAWAY, NJ, USA,IEEE, 4 April 2005 (2005-04-04), pages 237a - 237a, XP010785829, ISBN: 0-7695-2312-9 *

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2450167A (en) * 2007-06-18 2008-12-17 Nec Corp Discontinuous Reception In A Mobile Radio Communications Network
GB2450167B (en) * 2007-06-18 2009-07-29 Nec Corp Discontinuous Reception In A Mobile Radio Communications Network
US8089739B2 (en) 2007-10-30 2012-01-03 Agere Systems Inc. Electrostatic discharge protection circuit
WO2009100136A2 (en) * 2008-02-04 2009-08-13 Qualcomm Incorporated Suitable trigger mechanism to control new cell identification in ue when in drx mode
WO2009100136A3 (en) * 2008-02-04 2009-12-30 Qualcomm Incorporated Suitable trigger mechanism to control new cell identification in ue when in drx mode
US8121632B2 (en) 2008-02-04 2012-02-21 Qualcomm Incorporated Suitable trigger mechanism to control new cell identification in UE when in DRX mode
US9693299B2 (en) 2009-11-30 2017-06-27 Nokia Technology Oy Method and apparatus for power saving operations in wireless network elements
US8611240B2 (en) 2010-11-15 2013-12-17 Blackberry Limited Managing wireless communications
WO2012065914A1 (en) 2010-11-15 2012-05-24 Research In Motion Limited Managing wireless communications
EP4297527A3 (en) * 2010-11-15 2024-03-13 Malikie Innovations Limited Managing wireless communications
WO2012065915A1 (en) * 2010-11-15 2012-05-24 Research In Motion Limited Managing wireless communications
US8654691B2 (en) 2010-11-15 2014-02-18 Blackberry Limited Managing wireless communications
US8937876B2 (en) 2010-11-15 2015-01-20 Blackberry Limited Managing communications across a wireless network
EP3573421A1 (en) * 2010-11-15 2019-11-27 BlackBerry Limited Managing wireless communications
EP3515150A1 (en) * 2010-11-15 2019-07-24 BlackBerry Limited Managing wireless communications
US9538547B2 (en) 2011-07-01 2017-01-03 Intel Corporation User equipment initiated discontinuous operation in a wireless communications network
US9713164B2 (en) 2011-07-01 2017-07-18 Intel Corporation User equipment initiated discontinuous operation in a wireless communications network
EP2727418A4 (en) * 2011-07-01 2015-11-18 Intel Corp User equipment and method for quality of experience based discontinuous reception in lte-a networks
WO2013006381A3 (en) * 2011-07-01 2013-05-10 Intel Corporation User equipment initiated discontinuous operation in a wireless communications network
US9420533B2 (en) 2011-09-30 2016-08-16 Nokia Solutions And Networks Oy Discontinuous reception
WO2013044415A1 (en) * 2011-09-30 2013-04-04 Nokia Siemens Networks Oy Discontinuous reception
US9225759B2 (en) 2012-01-27 2015-12-29 Intel Corporation User equipment and method for discontinuous reception (DRX) mode in wireless communication networks
JP2018522439A (en) * 2015-05-04 2018-08-09 クアルコム，インコーポレイテッド Inter-node coordination to manage the modem processing pipeline

Similar Documents

Publication Publication Date Title
WO2007082934A1 (en) Method for dynamically adapting the drx cycle length in a radio communications system
EP1985036B1 (en) A method for aperiodic mobile assisted sleep mode
CN101682891B (en) Method and apparatus for configuring mode timers
US9838965B2 (en) Method and apparatus for discontinuous transmission/reception operation for reducing power consumption in cellular system
US20090325533A1 (en) Method for using an adaptive waiting time threshold estimation for power saving in sleep mode of an electronic device
CN1675949B (en) Timer-based sleep for terminals in wireless communication systems
KR101576142B1 (en) Apparatus and method for managementing power of wlan module in portable terminal
US8693355B2 (en) Jitter buffer management for power savings in a wireless communication device
EP2468049B1 (en) Power manager and method
CN104125615A (en) Dual-band adaptive concurrent handling method and dual-band adaptive concurrent handling device
JP2009206762A (en) Communication terminal device and receiving method
WO2013184050A1 (en) Controlling fast dormancy
Agrawal et al. Opsm-opportunistic power save mode for infrastructure ieee 802.11 wlan
JP4161988B2 (en) Method and station for optimizing the energy consumption of a station in a network
Zheng et al. Performance analysis of power management policies in wireless networks
Zhu et al. On supporting power-efficient streaming applications in wireless environments
Chakraborty et al. Policies for increasing throughput and decreasing power consumption in bluetooth mac
Hwang et al. The power saving mechanism with binary exponential traffic indications in the IEEE 802.16 e/m
Chakraborty et al. MAC scheduling policies with reduced power consumption and bounded packet delays for centrally controlled TDD wireless networks
Tabrizi et al. An intelligent power save mode mechanism for IEEE 802.11 WLAN
De Turck et al. An analytic model of IEEE 802.16 e sleep mode operation with correlated traffic
KR20080046837A (en) An apparatus and method for saving power in communication
Liu et al. A counter-driven adaptive sleep mode scheme for 802.16 e networks
WO2010028693A1 (en) Enhanced power saving mode for a mobile station
Lee et al. Cumulative-TIM method for the sleep mode in IEEE 802.16 e wireless MAN

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07704008

Country of ref document: EP

Kind code of ref document: A1