EP2027732A2 - Procédé et appareil pour gestion de batteries dans une unité d'émission/réception sans fil convergente - Google Patents

Procédé et appareil pour gestion de batteries dans une unité d'émission/réception sans fil convergente

Info

Publication number
EP2027732A2
EP2027732A2 EP07794635A EP07794635A EP2027732A2 EP 2027732 A2 EP2027732 A2 EP 2027732A2 EP 07794635 A EP07794635 A EP 07794635A EP 07794635 A EP07794635 A EP 07794635A EP 2027732 A2 EP2027732 A2 EP 2027732A2
Authority
EP
European Patent Office
Prior art keywords
rat
battery management
power state
state change
unit
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07794635A
Other languages
German (de)
English (en)
Inventor
Catherine Livet
Guang Lu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Technology Corp
Original Assignee
InterDigital Technology Corp
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 InterDigital Technology Corp filed Critical InterDigital Technology Corp
Publication of EP2027732A2 publication Critical patent/EP2027732A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • 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 generally relates to wireless communication systems. More particularly, the present invention relates to power management in a converged wireless transmit/receive unit (WTRU) capable of operating over multiple radio access technologies (RATs).
  • WTRU converged wireless transmit/receive unit
  • RATs radio access technologies
  • a converged WTRU is a mobile device capable of communicating via multiple radio access technologies (RATs).
  • RATs radio access technologies
  • a converged WTRU offers rich services including voice, mobile access to e-mail and personal information, web browsing, audio and video playback and streaming, gaming, and the like.
  • communicating via multiple RATs requires a large amount of power resulting in the rapid drain of a converged WTRU's battery.
  • communication via multiple RATs requires the converged WTRU to transmit and receive on each of the multiple RATs.
  • a converged WTRU may have multiple RF chains, or may be capable of communicating via multiple RATs simultaneously. Since a converged WTRU is generally a portable device, satisfying power demands by increasing the battery size is not desired. Accordingly, minimizing power consumption in a converged WTRU is desirable.
  • the transceiver generally draws the largest amount of power. Therefore, the simplest way to conserve power is to turn off the transceiver or reduce its activity when it is not required. This may be accomplished by placing the WTRU in a sleep state or discontinuous reception (DRX) mode.
  • DRX discontinuous reception
  • RATs radio access technologies
  • the first state is the Awake state, where a WTRU's radio is on.
  • the WTRU can be actively transmitting or receiving data, or the WTRU can be in a power save mode where it generates control traffic to monitor the radio and, if required, quickly switch to active transmission and reception of data.
  • the second state is a Sleep state, where a WTRU's radio is periodically turned off. The WTRU intermittently awakes to receive information from the network, such as, for example, beacons in an IEEE 802.11 RAT, a Pilot Channel (PCH) in a Third Generation Partnership Project (3G) RAT, and the like.
  • the network side may store packets addressed to the sleeping WTRU in a buffer and deliver the packets when the WTRU is in the Awake state.
  • RAT protocols define the required and optional power management modes for a given technology.
  • WLAN wireless local area network
  • the client radio will alternate between two states: (1) active state, where the wireless client is constantly powered actively transmitting and receiving; and (2) power save state that occurs when the wireless client is intermittently sleeping.
  • WLAN access points in an infrastructure network track the state of every associated WTRU. These access points will buffer the traffic destined for a WTRU in a Sleep state. At fixed intervals, the AP will send out a TIM (Traffic Indication Map) frame indicating which sleeping WTRUs have buffered traffic waiting at the access point. A WTRU in a sleep state will intermittently power on its receiver and receive the TIM. If the WTRU has traffic waiting, it will send a packet switched (PS)-PoIl frame to the AP. The WTRU will wait for the traffic until it is received, or the AP will send another TIM frame indicating that there is no buffered traffic.
  • PS packet switched
  • a WTRU may be in either one of two basic states, idle state or connected state. In the idle state, the WTRU is "camping on a cell". However, the WTRU is still able to receive signaling information such as paging. The WTRU will stay in the idle state until a radio resource controller (RRC) connection is established.
  • RRC radio resource controller
  • Various connected state modes are defined in UMTS, including cell dedicated channel (CELL-DCH), cell forward access channel (CELL-FACH), cell paging channel (CELL_PCH), and UMTS terrestrial radio access network (UTRAN) registration area paging channel (URA_PCH), each having varying degrees communication capability and power saving benefits.
  • FIG. 1 a prior art converged WTRU 110 is shown in a multi-RAT wireless environment 100.
  • Various RATs RATi, RAT2, ..., RANN are available for communication via their respective protocols.
  • the converged WTRU 110 includes a plurality of RAT processing units 120i, I2O2, ..., 12ON, for communicating with each RATi, RAT2... RATN, respectively.
  • each RAT processing unit 120i, 1202, ..., 12ON are controlled by respective RAT battery management units, 130i, 1302, ..., 13ON. These RAT battery management units 1301, 1302, ..., 13ON manage power and resources in accordance with their respective RAT protocol.
  • the converged WTRU 110 therefore includes functionality for communicating via multiple RATs, and for managing power and resources in accordance with each respective RAT's protocol and power modes.
  • Other WTRU components 140 include various other components and functionality including a display, input devices, transmitter, and the like.
  • RATi processing unit 12Oi provides RAT specific protocol functionality in conjunction with the other WTRU components 140, while RATi battery management unit 13Oi manages power resources and power modes.
  • converged WTRU 110 lacks coordination in that each RAT processing unit 120i, 1202, ..., 12ON, and associated RAT battery management unit 130i, 1302, ..., 13ON, operate independently of each other. Opportunities for minimizing power consumption are therefore lost. Accordingly, a method and apparatus for coordinating multi-RAT battery management in a converged WTRU is desired.
  • the present invention is a method and apparatus for minimizing power consumption in a converged WTRU.
  • power consumption is minimized by coordinating battery management of the various RATs supported by the converged WTRU.
  • a coordinated multi-RAT battery management (CMRBM) unit is used by the converged WTRU to minimize power consumption.
  • the CMRBM unit monitors various power and link metrics of the various RATs supported by the converged WTRU, and coordinates power states of the converged WTRU.
  • Figure 1 illustrates conventional battery management in a converged WTRU
  • Figure 2 illustrates a converged WTRU including a coordinated multi-RAT battery management unit according to a preferred embodiment of the present invention
  • Figure 3 is a state machine diagram of the possible power modes of the converged WTRU of Figure 2;
  • Figure 4 is a flow diagram of a method for coordinating multi-RAT battery management in the converged WTRU of Figure 2;
  • Figure 5 is a flow diagram of a method for coordinating multi-RAT battery management using a configuration reports.
  • Figure 6 is a flow diagram of a method for coordinating multi-RAT battery management during inter-RAT handover.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0026] Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone (without the other features and elements of the preferred embodiments) or in various combinations with or without other features and elements of the present invention.
  • a WTRU includes but is not limited to a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, or any other type of device capable of operating in a wireless environment.
  • UE user equipment
  • FIG. 2 shows a converged WTRU 210 including a CMRBM unit
  • the CMRBM unit 220 coordinates the various RAT battery management units 230i, 2302, - - - , 23ON 3 (collectively referred to herein using reference numeral 230) which in turn control the power and resource management of each respective RAT processing unit 240i, 2402, ..., 24ON (collectively referred to herein using reference numeral 240).
  • the multi-RAT wireless communication environment includes RATi, RAT2, ..., RATN, which may be, purely by way of example and in no way limiting the scope of the present invention, a general packet radio service (GPRS) network, a universal mobile telecommunication (UMTS) network, a global system for mobile communications (GSM) network, a GSM enhanced data rates for GSM evolution (EDGE) radio access network (GERAN), and a wireless local area network (WLAN), such as an IEEE 802. Hx compliant network.
  • the converged WTRU 210 includes other WTRU components 250, which may include a transceiver, memory, display, and the like.
  • the CMRBM unit 220 coordinates the various RAT battery management units 240i, 2402, ..., 24ON of the converged WTRU 210.
  • three generic power states are preferably utilized by the CMRBM unit 220.
  • the first power state is the Awake state. In the Awake state, the converged WTRU 210 is actively transmitting and/or receiving data.
  • the CMRBM Awake state is analogous to a WLAN active state and the UMTS connected state, discussed above.
  • the second power state is the Sleep state. In the Sleep state, a RAT is operating with reduced functionality and decreased power consumption, typically powering on only periodically.
  • the Sleep power state is analogous to a UMTS idle state, discussed above.
  • the third power state is the Off state. In the Off state, a RAT is completely powered down and does not periodically transmit or receive traffic.
  • a state machine 300 utilized by the CMRBM unit 220 of converged WTRU 210 of Figure 2 for controlling RAT battery management units is shown.
  • a given RAT processing unit is completely powered off.
  • a given RAT processing unit is powered and at least partially operational.
  • the ON state 320 further comprises an Awake Mode 330 and a Sleep Mode 340.
  • Awake Mode 330 a RAT processing unit is fully operational and may even be actively transmitting data to or receiving data from a network.
  • the RAT processing unit is operating with reduced functionality.
  • a RAT processing unit will power off its transceiver periodically and reduce control messaging, as described above.
  • the CMRBM unit 220 power states are generalized power states for use in coordinating multi-RAT battery management.
  • a given RAT protocol may define various sub-states or modes of a given CMRBM power state.
  • the Active state in the UMTS access technology comprises at least four sub-states (URA_PCH, CELLJDCH, CELL_PCH, and CELL_FACH described above). While the CMRBM unit 220 coordinates battery management generally, the specific sub-state selected by a RAT battery management unit is ultimately determined by the RAT battery management unit according to its respective RAT protocol.
  • a RAT battery management unit may change from the OFF state 310 to the ON state 320, and vice versa, via receipt of a state change request. While in the ON state, a RAT battery management unit may alternate between the Awake Mode 330 and the Sleep Mode 340 by way of a state change request. Alternatively, a RAT battery management unit may unilaterally change its state or mode based on its respective RAT protocol and battery management configuration.
  • the CMRBM unit 220 preferably communicates with the various RAT battery management units 240i, 2402, ..., 24ON of the converged WTRU 210 by way of the messaging primitives detailed, by way of example, in Table 1 below.
  • Other primitives may also be used, and the primitives discussed below may contain additional information elements than those explicitly recited in the description, as desired.
  • Figure 4 is a flow diagram 400 of a method for coordinating multi-
  • the CMRBM unit 220 monitors the various RAT battery management units 240i, 2402, ..., 24ON contained in the converged WTRU 210, as well as various signal and link metrics of the RAT, (step 410). Based on this monitoring, the CMRBM unit 220 determines whether a state or mode change of any of the RAT battery management units is desired, (step 420). This determination may be based on any principal for minimizing battery power of the converged WTRU 220. For example, when there is no network of a given RAT available, for example RATi, it is desirable to place the corresponding RAT battery management unit 23Oi and RAT processing unit 240i.in an OFF mode to conserve power.
  • the RAT battery management unit 23Oi and RAT processing unit 240i may then be placed in the ON mode.
  • predetermined RAT processing units may be placed in an OFF mode, either permanently or periodically, to conserve battery power.
  • a user of the converged WTRU 210 may configure the
  • the CMRBM unit 220 may adjust power modes and states as desired.
  • the CMRBM unit 220 may request the change of state of a RAT battery management unit 230 from Sleep mode to Awake mode, or to refuse the RAT battery management unit 230 to change to Sleep mode based on its respective power management protocol, when a handover to this RAT is imminent, as discussed in greater detail below with reference to Figure 6.
  • the CMRBM may utilize link quality metrics to affect the state change of any RAT. For example, when the WTRU 210 is connected to several RATs and the link quality is good on these RATs, the CMRBM may request a RAT to change its state to Sleep mode, or vice versa.
  • the CMRBM unit 220 determines that a state or mode change is required in step 420, the CMRBM unit 220 requests a RAT battery management unit 230 to make a state or mode change, (step 430).
  • the CMRBM unit 220 uses the primitives defined in Table 1 above for requesting the state change.
  • the CMRBM unit 220 sends a "State Change Request" message to the RAT battery management unit 230 where a state or mode change is requested.
  • the RAT battery management unit 230 indicates whether it will comply with the request, based on its RAT specific protocols, and preferably sends a "State Change Indication" message confirming its current state, (step 440).
  • a specific RAT changes modes eg., from an
  • the network is typically informed of the mode or state change so that traffic destined for the converged WTRU 210 may be buffered by the network, as discussed above, or for other reasons.
  • the RAT specific protocols for synchronizing power modes with the network are used in order to accomplish this.
  • any RAT battery management 230 unit desires a state change (step 450).
  • a RAT battery management unit 230 may make an independent decision regarding its state based upon RAT specific protocols. If no RAT battery management unit 230 desires a state change, the method returns to step 410 for further monitoring. If a RAT battery management unit 230 desires a state change, the RAT battery management unit 230 requests permission for the state change from the CMRBM unit 220, (step 460).
  • the request is a "State Information Request" primitive as detailed above in Table 1.
  • the CMRBM unit 220 Upon receiving the state change request, the CMRBM unit 220 determines whether to grant the state change request and signals the requesting RAT battery management unit 230 accordingly, (step 470). Preferably, the CMRBM unit 220 signals the requesting RAT battery management unit 230 using a "State Information Response" message as detailed above in Table 1. It is noted that the CMRBM unit 220 may or may not grant the requested state change, and the requesting RAT battery management unit 230 may proceed with the state change regardless of the permission granted or denied by the CMRBM unit 220. [0039] In another embodiment, referring to Figure 5, a flow diagram 500 of a method for coordinating multi-RAT battery management in converged WTRU 210 using configuration reports is shown.
  • each RAT battery management unit 230 informs the CMRBM unit 220 of its respective battery management configuration, (step 520).
  • the RAT battery management units 230 send the CMRBM unit 220 a "Configuration Report" message as defined in Table 1 above. It is noted that typically the initial battery management configuration is dictated by the specific RAT protocol.
  • the CMRBM unit 220 compiles the reports and determines the need to request state changes of any of the RAT battery management units 230 so that power consumption is ininimized, (step 530). If the CMRBM unit 210 determines no state changes are required (i.e.
  • the method advances to step 550.
  • the CMRBM unit 220 determines a state change is desired (i.e. the converged WTRU 210 could be configured more efficiently)
  • the CMRBM unit 220 requests a RAT battery management unit 230 to make a state change, (step 540).
  • this request is in the form of a "Configuration Request" message as defined above in Table 1.
  • the RAT battery management unit 230 requested to change states may then determine, on its own accord, whether to make the state change or not, based on its specific RAT protocol. The chosen state will be indicated by the RAT battery management unit 230 in the next configuration report.
  • the various RAT battery management units 230 repeat the configuration reporting periodically, (step 550). The periodic reporting may be at fixed intervals, or may be dynamically adjusted based on user controls, or the CMRBM unit 220.
  • the CMRBM unit 220 may request a RAT battery management unit 230 to completely power down, thereby shutting down its respective RAT processing unit 240. This is preferably achieved by sending a "Turn Off Request” message as defined above in Table 1. Similarly, the CMRBM unit 220 may request a RAT battery management unit 230 in a powered down state to turn on. This is preferably achieved by sending a "Turn On Request” message as defined above in Table 1. Converged WTRU 210 may power a RAT battery management unit 230, and thereby a corresponding RAT processing unit 240, on and off in various circumstances to conserve power.
  • the CMRBM unit 220 may turn off a RAT battery management unit 230 and corresponding RAT processing unit 240.
  • the CMRBM unit 220 provides efficient power management of converged WTRU's 210 various access technologies during inter-RAT handover.
  • the CMRBM unit 220 works in conjunction with a converged WTRU's 210 inter-RAT handover policy functionality to improve the execution of an inter-RAT handover by reducing handover delay.
  • Converged WTRU's 210 CMRBM unit 220 monitors various RAT battery management units 230 and RAT signal quality and power management metrics, (step 610). Based on the converged WTRU's 210 inter-RAT handover policy, it is determined whether an inter-RAT handover is desired, (step 620).
  • step 620 it is then determined whether the target RAT processing unit(s) 240 are in an awake state, (step 630). If the target RAT processing unit(s) are not in an awake state, the CMRBM unit 220 signals the target RAT(s) battery management unit(s) 230 to place the target RAT(s) processing unit(s) 240 in an appropriate awake state for handover, step (640). This may be accomplished by either method described above with reference to Figure 4 and 5 (i.e. individual RAT signaling or configuration reports).
  • the converged WTRU 210 When the target RAT processing unit(s) are in an awake state, the converged WTRU 210 performs inter-RAT handover, (step 650). Finally, the CMRBM unit 220 signals the various RAT battery management units 230 in the converged WTRU 210 so that a minimal power consumption configuration is achieved, (step 660). [0042] For example, when converged WTRU 210 is in an active state using a first RAT processing unit 240i, but the CMRBM unit 220 senses diminishing link quality (i.e.
  • the CMRBM unit 220 requests a second RAT battery management unit 2302, or plurality of other RAT battery management units 2302, ..., 23ON, and corresponding RAT processing units 2402, ..., 24ON that are currently in a sleep state to change to an awake state.
  • the CMRBM unit 220 may select RAT processing units 2402, ..., 24ON that have the best link quality, or RAT processing units 2402, ..., 24ON that are best suited to handle the type of traffic transmitted using the first RAT processing unit 240i. In this manner, a handover target RAT is in an awake state and ready to receive traffic, thereby minimizing handover delay.
  • WTRU converged wireless transmit/receive unit
  • RATs radio access technologies
  • a method further comprising: requesting a power state change of a RAT battery management unit based on the determination.
  • a method according to any of embodiments 3-8, wherein determining whether a power state change is desired is further based on link quality metrics. 10. The method of embodiment 9, wherein if a link quality metric of a RAT is below a predetermined threshold, a change in the power state of a RAT battery management unit associated with the RAT is requested.
  • a method further comprising: each RAT battery management unit reporting its power management configuration, wherein determining whether a power state change is desired is based on the reporting.
  • a method further comprising: determining at each RAT battery management unit whether a power state change is desired; and requesting permission to change power state when the determination is positive.
  • a method according to any of embodiments 3-15, wherein the determination of whether a power state change is required is based on data rates of the plurality of RATs. 17. A method according to any of embodiments 3-16, wherein the determination of whether a power state change is required is based on the converged WTRU's inter-RAT handover policy.
  • a converged wireless transmit/receive unit comprising: a transceiver; and a plurality of radio access technology (RAT) processing units; each RAT processing unit in conjunction with the transceiver configured to transmit and receive over a different RAT.
  • WTRU converged wireless transmit/receive unit
  • each of the plurality of RAT battery management units are configured to control a power state of a respective RAT processing unit.
  • a WTRU according to any of embodiments 18-20, further comprising: a coordinated multiple RAT battery management (CMRBM) unit configured to coordinate each of the plurality of RAT battery management units to minimize power consumption.
  • CRBM coordinated multiple RAT battery management
  • each RAT battery management unit is configured to receive a power state change request from the CMRBM unit.
  • each RAT battery management unit is further configured to determine whether to implement the requested power state change based on the RAT battery management unit's protocol.
  • each RAT battery management unit is further configured to indicate its compliance with the power state change request to the CMRBM unit.
  • the CMRBM unit is further configured to determine whether a power state change is desired based on the reporting.
  • each RAT battery management unit is further configured to report its power management configuration.
  • each RAT battery management unit is configured to: determine whether a power state change is desired.
  • each RAT battery management unit is configured to: request permission from the CMRBM unit to change power state when the determination is positive.

Abstract

La présente invention concerne un procédé et un appareil permettant de minimiser la consommation d'énergie dans une unité d'émission/réception sans fil (WTRU) convergente. Dans un mode de réalisation préféré, la consommation d'énergie est minimisée en coordonnant la gestion de batteries des divers outils RAT pris en charge par l'unité WTRU convergente. Une unité coordonnée de gestion de batteries d'outils RAT multiples (CMRBM) est utilisée par l'unité WTRU convergente afin de minimiser la consommation d'énergie. L'unité CMRBM surveille diverses mesures de puissance et de liaison des divers outils RAT pris en charge par l'unité WTRU convergente et coordonne les états de puissance de l'unité WTRU convergente.
EP07794635A 2006-05-10 2007-05-08 Procédé et appareil pour gestion de batteries dans une unité d'émission/réception sans fil convergente Withdrawn EP2027732A2 (fr)

Applications Claiming Priority (3)

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US79919606P 2006-05-10 2006-05-10
US82756806P 2006-09-29 2006-09-29
PCT/US2007/011076 WO2007133526A2 (fr) 2006-05-10 2007-05-08 Procédé et appareil pour gestion de batteries dans une unité d'émission/réception sans fil convergente

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EP2027732A2 true EP2027732A2 (fr) 2009-02-25

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EP (1) EP2027732A2 (fr)
JP (1) JP5036808B2 (fr)
KR (2) KR101289601B1 (fr)
CN (1) CN101444131B (fr)
TW (2) TWI423704B (fr)
WO (1) WO2007133526A2 (fr)

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WO2007133526A2 (fr) 2007-11-22
JP5036808B2 (ja) 2012-09-26
CN101444131B (zh) 2012-04-18
TWI423704B (zh) 2014-01-11
KR20090018732A (ko) 2009-02-20
TWI364918B (en) 2012-05-21
KR20090014201A (ko) 2009-02-06
TW200814557A (en) 2008-03-16
WO2007133526A3 (fr) 2008-03-06
KR101289601B1 (ko) 2013-08-07
TW200947888A (en) 2009-11-16
JP2009536804A (ja) 2009-10-15

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