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WO2007102689A1 - Procédé permettant de réduire la consommation électrique d'un terminal dans un système cellulaire - Google Patents

Procédé permettant de réduire la consommation électrique d'un terminal dans un système cellulaire Download PDF

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Publication number
WO2007102689A1
WO2007102689A1 PCT/KR2007/001094 KR2007001094W WO2007102689A1 WO 2007102689 A1 WO2007102689 A1 WO 2007102689A1 KR 2007001094 W KR2007001094 W KR 2007001094W WO 2007102689 A1 WO2007102689 A1 WO 2007102689A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
low power
consuming operation
base station
drx
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.)
Ceased
Application number
PCT/KR2007/001094
Other languages
English (en)
Inventor
Jae-Heung Kim
Jung-Im Kim
Kyoung-Seok Lee
Byung-Han Ryu
Seung-Chan Bang
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.)
Electronics and Telecommunications Research Institute ETRI
Original Assignee
Electronics and Telecommunications Research Institute ETRI
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
Priority claimed from KR1020070010883A external-priority patent/KR101208271B1/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to US14/884,156 priority Critical patent/USRE47212E1/en
Priority to US12/281,913 priority patent/US8560025B2/en
Priority to US16/236,229 priority patent/USRE48984E1/en
Publication of WO2007102689A1 publication Critical patent/WO2007102689A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower 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. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/287—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission when the channel is in stand-by
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/44—TPC being performed in particular situations in connection with interruption of transmission
    • 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 low power-consuming operation in a cellular system; and, more particularly, to a low power-consuming operation method of a terminal that can reduce the power consumption of the terminal and extend a call waiting time in a cellular system for packet transmission.
  • terminals have performed a low power- consuming operation, i.e., a power-saving operation, by using a sleep-mode operation based on a discontinuous reception (DRX) cycle, which is a system parameter.
  • DRX discontinuous reception
  • the WCDMA 3GPP system aims to provide circuit and packet services in a circuit- based system.
  • a Long-Term Evolution (LTE) which is under standardization process to provide diverse packet services, is a packet-based system aiming to provide only a packet service.
  • the LTE system which is devised to provide a packet service having a burst characteristic requires an efficient low power-consuming operation method for terminals.
  • a method for performing low power-consuming operation to reduce power consumption of a terminal in a cellular system for a packet service including the steps of: a) establishing low power-consuming operation parameters including a low power-consuming operation indicator in a terminal operating in a transmission suspension mode, which is a sub-state of an active state; and b) performing the low power-consuming operation based on the low power-consuming operation parameters in the terminal according to a value of the low power-consuming operation indicator.
  • the method of the present invention can effectively reduce power consumption of a terminal by using an indicator indicating whether the terminal needs to perform a low power-consuming operation to control the low power-consuming operation in a cellular system for transmitting packets, when the terminal is in an active state.
  • FIG. 1 is a diagram illustrating a terminal state in a cellular system to which the present invention is applied.
  • FIG. 2 is a view showing a low power-consuming operation based on low power- consuming operation parameters in accordance with an embodiment of the present invention.
  • FIG. 3 is a signaling flowchart between a base station and a terminal that perform low power-consuming operation in accordance with an embodiment of the present invention.
  • Fig. 1 is a diagram illustrating terminal states in a cellular system to which the present invention is applied.
  • a cellular system providing a packet service defines and manages the state of a terminal as shown in Fig. 1 to efficiently operate limited radio resources in nodes over a base station, i.e., a node B.
  • the state of the terminal is defined as an attached mode 1.
  • the state of the terminal is defined as a detached mode 2.
  • Terminals in the attached mode 1 are divided into those of an active state 3 and those of an idle state 4 according to whether or not a packet service is provided.
  • the active state 3 is a state where a terminal can be allocated with radio resources for transmitting/receiving packet data under the control of a scheduling unit disposed in a base station.
  • the active state 3 is divided into a transmission mode (Tx on) 5 and a transmission suspension mode (Tx off) 6 according to whether radio resources for transmitting packet data are allocated.
  • a conventional terminal performs a low power-consuming operation, which is so-called a power-saving operation, by maintaining only the least control channel with a base station only in the idle state 4 where there is no data to be transmitted/received based on the burst property of packet data.
  • the terminal may enter the idle state 4 by a scheduling unit of a base station, regardless of the state of the terminal.
  • the scheduling unit operates in the transmission suspension mode because there are no data to be transmitted or received due to the burst characteristic of packet data or other reasons and does not allocate the radio resources for transmitting/receiving packet data and control information.
  • the terminals need to efficiently perform the low power- consuming operation in a transmission suspension mode duration to minimize the power consumption of the terminal.
  • terminals performs low power-consuming operation based on a discontinuous reception (DRX) cycle established between the terminals and the base station in a duration of the transmission suspension mode 6, which is a sub-state of the active state 3, while maintaining the least power for a control channel.
  • DRX discontinuous reception
  • FIG. 2 is a view showing a low power-consuming operation based on low power- consuming operation parameters in accordance with an embodiment of the present invention.
  • the low power-consuming operation of a terminal is controlled based on low power-consuming operation parameters in the transmission suspension mode 8 of the active state.
  • the low power-consuming operation parameters include an active-state initial DRX cycle length 10, a DRX cycle augmentation coefficient, a DRX duration 11, the number of DRX durations 12, active dwelling time (Active_dwell_time) 13, low power consuming operation indicator, i.e., a power-saving indicator, and a physical layer uplink sync sustaining time (Ll_UL_Sync_keep_time) 16.
  • the active-state initial DRX cycle length 10 is the minimum value of a DRX cycle length for a terminal in the transmission suspension mode to perform low power- consuming operation.
  • the DRX cycle augmentation coefficient is an increased amount of the DRX cycle length that performs DRX operation.
  • the DRX duration 11 is a section to which a DRX is applied. It is established as a counter number or time. When one DRX duration ends, another DRX cycle which is obtained by increasing the DRX cycle as much as the DRX cycle augmentation coefficient parameters in the next DRX duration.
  • the number of DRX durations 12 is the number of DRX durations needed for a terminal to perform the low power-consuming operation.
  • the active dwelling time (Active_dwell_time) 13 is a threshold value of time for which a terminal can remain in the active state without having packet data to be transmitted to a transmission buffer.
  • the low power-consuming operation indicator i.e., a power-saving indicator indicates whether to perform the low power-consuming operation in a terminal.
  • the low power-consuming operation indicator is set “on,” the base station and terminal performs low power-consuming operation when the terminal enters the transmission suspension mode.
  • the low power-consuming operation indicator is set “off,” the low power-consuming operation is not performed in the terminal.
  • the physical layer uplink sync sustaining time (Ll_UL_Sync_keep_time) 16 is a threshold value of time for which uplink synchronization should be sustained in a physical layer while a terminal operates in the transmission suspension mode.
  • the low power-consuming operation parameters are established through negotiation between the base station and the terminal.
  • the active-state initial DRX cycle length parameter may differ according to the quality of service (QoS) attributes of a provided packet service.
  • QoS quality of service
  • the base station may inform the generation of downlink traffic in a monitoring section 9 at a termination moment of a DRX cycle or it may transmit radio resource allocation information for reporting or a radio resource allocation request through the uplink.
  • a terminal operating in the transmission suspension mode recognizes the presence of downlink traffic transmitted through a downlink traffic notification channel in the monitoring section and determines whether to receive the downlink packet data or not. Otherwise, the terminal operating in the transmission suspension mode recognizes uplink radio resource allocation information transmitted through a downlink control channel and transmits control information, such as measurement information or a radio resource allocation request through the uplink.
  • the terminal When there is no downlink traffic or when packet data to be transmitted through the uplink is not transmitted from the upper layer of a terminal, the terminal performs the low power-consuming operation in DRX cycles until the next monitoring section. In the low power-consuming operation, the terminal does not receive downlink signals and does not transmit signals through the uplink, either.
  • the DRX cycle length for low power-consuming operation is determined by a base station to efficiently operate the system.
  • the base station may determine the next DRX cycle based on the control information transmitted in the monitoring section 9 and notify terminals of the next DRX cycle.
  • the scheduling unit of the base station may change the DRX cycle according to the QoS attributes of the provided packet service and loads applied to the system.
  • a DRX cycle is applied to one DRX duration.
  • the base station and the terminals can negotiate and reestablish the next DRX duration.
  • a DRX cycle is determined in the following algorithm based on the parameters determined through the negotiation between the base station and the terminals.
  • DRX cycle(n+l) DRX cycle (n) * DRX cycle augmentation coefficient.
  • DRX duration time duration (or a threshold value of a counter) to which the same
  • the terminals perform the low power-consuming operation based on the low power-consuming operation parameters determined as above.
  • the scheduling unit in the base station shifts the terminal into the idle state or reestablishes the low power-consuming operation parameters.
  • the scheduling unit of the base station shifts the terminal into the idle state or re-establishes the low power-consuming operation parameters.
  • the scheduling unit and the terminal may include a timer for a physical layer uplink sync sustaining time (Ll_UL_Sync_keep_time) and, when data to be transmitted or received are not generated until the moment 17 when a physical layer uplink sync sustaining time is achieved, they operate the terminal not to sustain the physical layer sync for the uplink and reduce the power consumption of the terminal.
  • Ll_UL_Sync_keep_time a timer for a physical layer uplink sync sustaining time
  • FIG. 3 is a signaling flowchart between a base station and a terminal that perform low power-consuming operation in accordance with an embodiment of the present invention.
  • the base station determines low power-consuming operation parameters based on the QoS of the packet service, generates system information including the low power- consuming operation parameters, and transmits it through a broadcasting channel at step S311.
  • the low power-consuming operation parameters included in the system information are the active-state initial DRX cycle length 10, the DRX cycle augmentation coefficient, the DRX duration 11, the number 12 of DRX durations, and the active dwelling time (Active_dwell_time) 13.
  • the base station when packet data are generated, the base station attempts to provide a service corresponding to the packet data.
  • the base station attempts to provide the service through paging, and the terminal receives the system information during a paging monitoring section and attempts to access in a random access method to receive the service corresponding to the generated packet data.
  • the base station shifts the terminal into the active state at step S313, and the terminal shifts into the active state and operates in the transmission mode at step S314.
  • the terminal shifts from the idle state into the active state, the base station and the terminal establish a session though negotiation.
  • RRC Radio Resource Control
  • the terminal reports a low power-consuming operation indicator preferred according to the power setup environment of the terminal to the base station.
  • the terminal When the terminal is connected to an external power source or it does not need to perform the low power-consuming operation for other reasons, the terminal reports a low power-consuming operation indicator set to be "off to the base station to inform the base station that the terminal does not need to perform the low power-consuming operation. In the other cases, the terminal reports a low power-consuming operation set to be "on" which informs the base station that it needs to perform the low power- consuming operation.
  • the terminal may receive a signal directly from a user and set up a needed low power-consuming operation indicator.
  • the base station determines a low power-consuming operation indicator to be applied to the terminal based on the low power-consuming operation indicator reported by the terminal and the environment of the base station.
  • the terminal is shifted into the active state by controlling the state shift, and the terminal whose mode is shifted into the active state operates in the transmission mode at step S722, and the base station and terminal establishes session for the packet data service at step S723.
  • the base station determines the low power-consuming operation value to be applied to the terminal to be "on", it negotiates and sets up the low power-consuming operation parameters at step S318.
  • the terminal negotiates the low power-consuming operation parameters, such as the physical layer uplink sync sustaining time, the active-state initial DRX cycle length, the DRX cycle augmentation coefficient, the DRX duration, the number of DRX durations, and the active dwelling time, through negotiation with the base station, or establishes the parameters based on the system information transmitted through a broadcasting channel without negotiation.
  • the low power-consuming operation parameters such as the physical layer uplink sync sustaining time, the active-state initial DRX cycle length, the DRX cycle augmentation coefficient, the DRX duration, the number of DRX durations, and the active dwelling time
  • step S319 the terminal enters the transmission suspension mode and performs low power-consuming operation based on the established low power- consuming operation parameters.
  • the base station can not only apply an appropriate DRX cycle in consideration of the QoS of the provided packet service, but also divide the terminals within the service coverage into those in need of the low power-consuming operation and those that do not need the low power-consuming operation based on the low power-consuming operation indicator.
  • the scheduling unit of the base station can inform generation of downlink traffic to the terminals operating in the transmission suspension mode of the active state and having a low power-consuming operation indicator of "off, whenever it needs to do, regardless of the value of the low power-consuming operation parameters, such as the DRX cycle length.
  • the scheduling unit can also transmit a report or radio resource allocation information for requesting resources through the uplink.
  • the scheduler sets up the low power-consuming operation parameters according to the QoS of the provided packet service, and performs low power-consuming operation.
  • the base station determines and changes the low power-consuming operation indicator from on into off and notifies the change to the terminal to there by control the terminal operate in the active state without performing the low power-consuming operation.
  • the base station determines the low power-consuming operation indicator in consideration of the low power-consuming operation indicator reported by the terminal and the base station environment, and informs the terminal of the determined low power-consuming operation indicator.
  • the base station transmits information informing the generation of downlink traffic in a monitoring section 9 where a downlink signal is received, or it transmits radio resource allocation information for transmitting uplink control information to make a report or request for radio resources through the uplink at step S320.
  • the terminal changes its mode into the transmission mode upon the state shift control, which is performed in the base station at step S321, at step S322.
  • the terminal transmits packet data or attempts to provide a new service.
  • the terminal cancels a session.
  • the method of the present invention may be realized as a program and stored in computer-readable recording media, such as CD-ROM, RAM, ROM, floppy disks, hard disks, and magneto-optical disks. Since the present invention can be easily implemented by those of ordinary skill in the art of the present invention, detailed description on it will not be provided herein.
  • the method of the present invention can effectively reduce the power consumption of a terminal by controlling the terminal to perform the low power-consuming operation in the active state with an low power-consuming operation indicator, which indicates whether the terminal is in need of performing the low power-consuming operation, in a cellular system for transmitting packets.

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

Abstract

La présente invention a trait à un procédé et à un appareil permettant d'émettre/recevoir des paquets de manière discontinue afin de garantir la faible consommation électrique d'un terminal dans un système cellulaire de transmission par paquets. L'invention concerne un procédé et un appareil permettant un fonctionnement à faible consommation électrique lorsqu'un terminal est à l'état actif dans un système cellulaire. Le procédé d'émission/réception discontinues de données par paquets destiné à réduire la consommation électrique d'un terminal dans un système cellulaire comprend les étapes consistant : (a) à établir des paramètres d'émission/réception discontinues (DTX/DRX) contenant des informations de cycle de DTX/DRX discontinues pour des terminaux fonctionnant en mode de suspension d'émission, qui est un sous-état de l'état actif; et (b) à effectuer la DTX/DRX sur la base des paramètres de DTX/DRX dans les terminaux fonctionnant en mode de suspension d'émission.
PCT/KR2007/001094 2006-03-07 2007-03-06 Procédé permettant de réduire la consommation électrique d'un terminal dans un système cellulaire Ceased WO2007102689A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US14/884,156 USRE47212E1 (en) 2006-03-07 2007-03-06 Method for reducing power consumption of a terminal in cellular system
US12/281,913 US8560025B2 (en) 2006-03-07 2007-03-06 Method for reducing power consumption of a terminal in cellular system
US16/236,229 USRE48984E1 (en) 2006-03-07 2007-03-06 Method for reducing power consumption of a terminal in cellular system

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR20060021316 2006-03-07
KR10-2006-0021316 2006-03-07
KR10-2006-0022697 2006-03-10
KR20060022697 2006-03-10
KR1020070010883A KR101208271B1 (ko) 2006-03-07 2007-02-02 셀룰라 시스템에서의 단말기 저전력 소모 동작 방법
KR10-2007-0010883 2007-02-02

Publications (1)

Publication Number Publication Date
WO2007102689A1 true WO2007102689A1 (fr) 2007-09-13

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PCT/KR2007/001094 Ceased WO2007102689A1 (fr) 2006-03-07 2007-03-06 Procédé permettant de réduire la consommation électrique d'un terminal dans un système cellulaire

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US (1) USRE48984E1 (fr)
WO (1) WO2007102689A1 (fr)

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