WO2011097766A1 - Procédé d'optimisation d'état de gestion des ressources radio et dispositif de communication de type machine - Google Patents

Procédé d'optimisation d'état de gestion des ressources radio et dispositif de communication de type machine Download PDF

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Publication number
WO2011097766A1
WO2011097766A1 PCT/CN2010/000206 CN2010000206W WO2011097766A1 WO 2011097766 A1 WO2011097766 A1 WO 2011097766A1 CN 2010000206 W CN2010000206 W CN 2010000206W WO 2011097766 A1 WO2011097766 A1 WO 2011097766A1
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Prior art keywords
state
resident
type communication
machine type
communication device
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PCT/CN2010/000206
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English (en)
Chinese (zh)
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WO2011097766A8 (fr
Inventor
晁华
汪勇刚
胡中骥
陈宇
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上海贝尔股份有限公司
阿尔卡特朗讯
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Priority to CN201080063167.2A priority Critical patent/CN102754495B/zh
Priority to PCT/CN2010/000206 priority patent/WO2011097766A1/fr
Publication of WO2011097766A1 publication Critical patent/WO2011097766A1/fr
Publication of WO2011097766A8 publication Critical patent/WO2011097766A8/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • 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 the field of Machine-Type Communications (MTC), and more particularly to a Radio Resource Control (RRC) state optimization method and an MTC device for an MTC device.
  • MTC Machine-Type Communications
  • RRC Radio Resource Control
  • Machine-like communication is a form of data communication that contains one or more entities that do not require interaction with humans. Services optimized for machine type communication and services optimized for communication between people are different from each other. Machine-type communication differs from current network communication services in that it includes the following aspects: different market scenarios; data communication; low cost; potentially very large number of communication terminals; and, to a large extent, very small service low mobility per terminal
  • An MTC device refers to an MTC device that does not move, moves very little, or moves only within a certain area. Such as vending machines, smart measurements and urban automation equipment.
  • the network operator can reduce the frequency of the mobility management process or simplify the mobility management; the network operator can dynamically configure the MTC device to reduce the frequency of the mobility management process Or simplify mobility management; it should be possible to configure the network to consider mobility management procedures that reduce frequency of occurrence or MTC devices located in specific areas; network operators can define the frequency of occurrence of location update procedures performed by MTC devices; The quotient can define low mobility for each MTC subscriber.
  • these MTC devices may be inactive for most of the time when data is not required to be transmitted. Powering down these MTC devices is an energy-saving option.
  • these MTC devices need to be able to detect possible network commands. For example, the network notifies/paging some or all of the devices to update the configuration or require the device to make some kind of report. Therefore, the sleep state is more suitable. In this state, the MTC device in question only needs to respond to the page.
  • UE idle state user equipment
  • PLMN Public Land Mobile (Communication) Network
  • UE User Equipment
  • Fig. 8 is a diagram showing the operation of the terminal device in the prior art. As shown in FIG. 8, the terminal device switches between a connection mode, a normal camp, any cell selection, and a state residing in any cell.
  • the above time control means that the MTC device can only transmit data at a predefined time interval or in all of the above features. It can be seen that for these use cases, the MTC device does not need to perform mobility like a conventional UE. Related processes, such as cell update procedure, RA/TA (Routing Area Routing Area/Tracking Area) update procedure, handover procedure, and the like. In addition, it is not necessary to periodically perform the measurements necessary for the cell reselection evaluation process, and thus the corresponding cell reselection process is not triggered. Therefore, the current user activity behavior defined in the 3GPP RRC_IDLE state needs to be optimized to avoid these processes and thus achieve energy savings.
  • the present invention proposes a method for optimizing the RRC state of the MTC device and MTC device. According to the technical solution of the embodiment of the present invention, a method for optimizing a radio resource control state is provided, which includes the following steps: performing network selection and cell selection;
  • the paging channel is detected
  • the connection mode state is entered, the regular data transmission is performed, and then the normal resident state is returned.
  • the paging channel is detected in accordance with the configured discontinuous reception DTX period.
  • the DRX cycle is configured or pre-configured by the network.
  • the paging channel is detected using a longer DTX period than a conventional user equipment.
  • the sleep state is directly switched from the resident sleep state, and the resident sleep state is returned after the emergency data transmission is completed.
  • the connected mode state after establishing a connection between the machine type communication device in the dormant state and the network, switching to the connected mode state.
  • the transition to the normal resident state is performed.
  • the event triggered paging comprises at least one of the following conditions:
  • a machine type communication device including: a network and a cell selection device, performing network selection and cell selection after the machine type communication device is powered on;
  • a state switching device that switches the machine type communication device between a normal resident state, a resident sleep state, and a connected mode state
  • a paging channel detecting device detecting a paging channel
  • the state switching device is controlled to enter the resident sleep state by the state switching device;
  • the machine type communication device is controlled by the state switching device to enter a connected mode state, perform regular data transmission, and then enter a normal resident state.
  • the machine type communication device in the resident sleep state detects the paging channel according to the configured discontinuous reception DTX period by using the paging channel detecting means.
  • the DTX period is configured or pre-configured by the network.
  • the paging channel is detected using a longer DTX period than a legacy user equipment.
  • the state switching device switches the machine type communication device directly from the resident sleep state to the connected mode state, and returns to the location after performing the emergency data transmission.
  • the resident sleep state Preferably, after the connection between the machine type communication device in the dormant state and the network is established, the machine type communication device is switched to the connected mode state by the state switching device.
  • the machine type communication device in the resident sleep state, when the paging channel detecting means detects the event-triggered paging, the machine type communication device is switched to the normal resident state by the state switching means.
  • the event triggered paging comprises at least one of the following conditions:
  • the method further includes a time-controlled device, wherein the event-controlled device determines a timing condition of the uplink data transmission timer, and the state switching device sets the device-type communication device if the timing condition is met Transition from resident sleep state to normal resident state.
  • the measurements necessary for the cell reselection evaluation process are performed, thereby triggering the corresponding cell reselection process.
  • the task when the task is switched from the normal resident state to the connected mode, the task returns to the normal resident state after the task is completed; when the task is switched from the resident sleep state to the connected mode, the task returns to the resident sleep state after the task is completed.
  • the shutdown operation is performed after entering the resident sleep mode for a predetermined time.
  • the beneficial effects of the present invention are: by introducing the idle mode for the current 3GPP system. Entering a new state saves energy and signaling overhead while ensuring immediate implementation of the MTC system requirements.
  • the invention also has the beneficial effects that the present invention introduces an event-triggered measurement necessary for performing a cell reselection evaluation process and a corresponding cell reselection process for a low mobility MTC device, thereby selecting one before each data transmission. The most suitable cell sends data to ensure the quality of data transmission.
  • FIG. 1 is a schematic diagram showing an RRC idle state transition according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing state switching between an MTC device and a network according to a first embodiment of the present invention
  • FIG. 3 is a schematic diagram showing state switching between an MTC device and a network according to a second embodiment of the present invention
  • a schematic diagram of state switching between an MTC device and a network according to a third embodiment of the present invention is shown
  • FIG. 5 is a schematic diagram showing state switching between an MTC device and a network according to a fourth embodiment of the present invention
  • Fig. 7 is a block diagram showing the structure of another MTC device according to an embodiment of the present invention.
  • Fig. 8 is a view showing the operation of the terminal device in the prior art. detailed description
  • Embodiments of the present invention are primarily concerned with low mobility MTC devices.
  • the low mobility MTC device does not need to transmit uplink data and there is no relevant mobility procedure, it is necessary to avoid unnecessary periodic measurement of the cell reselection evaluation process, thereby avoiding the corresponding cell reselection process, so as to make the MTC
  • the embodiment of the present invention proposes a technical solution for optimizing the activity of user equipment defined in the current 3GPP RRC-IDLE state, to allow the MTC device to sleep, which includes the following two aspects:
  • the basic idea of the embodiment of the present invention is to propose a new idle state, that is, a dormant state (Camped Sleep introduces such a dormant sleep state into the current RRC_IDLE state, in order to provide a kind of MTC device to the MTC device.
  • Good sleep state to save energy and optimize signaling overhead, avoid excessively heavy signaling processing and reduce excessive battery energy requirements.
  • MTC device activity behavior the activity behavior of this MTC device will be mainly for low
  • the RRC-IDLE mode uses this state to do the following:
  • the non-access stratum configures the discontinuous reception (DRX) of the MTC device.
  • the MTC DRX cycle can be longer than the DRX cycle of the traditional user equipment.
  • the terminal device In DRX mode, the terminal device only needs to monitor the information on the paging channel at a specific paging time within each DRX cycle to reduce power consumption.
  • the DRX period is configured by the network to the UE, and the paging moment of the UE is related to the identity of the UE itself;
  • the location of the MTC device known to the network is in the granularity of the routing area RA for the Universal Mobi le Telecommunication System (UMTS) and the granularity of the tracking area RA for the LTE system;
  • UMTS Universal Mobi le Telecommunication System
  • RRC Radio Network Controller
  • eNB Enhanced Base Station
  • FIG. 1 shows an RRC-IDLE state and state transition of an MTC device according to an embodiment of the present invention.
  • the RRC connection status for the UMTS system is denoted as CELL_FACH or CELL_DCH. Due to this new resident sleep state, there are four states in total for the RRC-IDLE mode.
  • Figure 1 shows the RRC-IDLE mode MTC device new task.
  • the MTC device After the MTC device successfully performs the PLMN selection and cell selection process, the MTC device finds a suitable cell resident and enters a normal camping state. Also, the AS (Access Stratum) reports this event to the NAS to be able to perform the necessary NAS registration process. In this normal park state, the MTC device obtains the normal service and performs the service in the normal park state. When the MTC device is in normal camping in the selected cell, the MTC device performs the following tasks:
  • the MTC device enters the state of selecting any cell; or the MTC device in the normal camping state does not find a suitable cell in the cell reselection evaluation process, the MTC device enters the state of selecting any cell; or the network rejects the NAS registration process, and the MTC device also Enter to select any cell status.
  • the resident sleep mode is a new state introduced in the idle state in the embodiment of the present invention.
  • the MTC device When entering the resident sleep state, the MTC device performs the following tasks:
  • ⁇ Detect the paging channel. If the paging information related to the MTC device itself is detected, the MTC device is stationed. Leave the sleep state and enter the normal park state to perform the paging response;
  • Network-triggered uplink transmissions for example: triggered by paging.
  • the MTC device After completing the emergency uplink transmission, the MTC device releases the RRC connection with the network and returns from the connected mode to the resident sleep state;
  • the MTC device residing in hibernation can be shut down to further save power.
  • a first embodiment of the present invention will be described in detail below with reference to FIG.
  • Fig. 2 is a diagram showing the state switching between the MTC device and the network according to the first embodiment of the present invention.
  • the MTC device is configured in multiple cells in the network.
  • Figure 2 shows the network and
  • the PLMN selection is performed and the cell selection process is completed in step S201.
  • the MTC determines the cells that can serve it. The MTC device then enters the normal park state.
  • step S202 in the normal camping state, the paging channel is detected. If the paging information related to the MTC device is not found, the resident sleep state is entered to save power (step S2031).
  • the time interval in which the paging information associated with the MTC device itself is not found may be several DRX cycles controlled by the timer. The length of the time interval is not limited here, and the time interval for not discovering the paging information associated with itself can be adjusted according to system operating conditions and energy saving requirements. For example, if the service interval required by the MTC device is long, the time interval in which the paging is not found may be set to be relatively short, so that the MTC device can enter the resident sleep mode as soon as possible to save energy.
  • the MTC device If the paging information associated with the MTC device itself is detected, the MTC device performs a discovery paging step and enters a connected mode state (S2032). The MTC device then performs regular data transfer (steps) S204) o After the data transmission ends (step S205), the RRC connection is released, and the normal resident state is returned. As such, the normal camping MTC device continues to perform paging detection, switching between the resident sleep state, the connected mode state, and the normal resident state.
  • the MTC device in the dormant state detects the paging channel according to the DRX cycle of the configured MTC device.
  • the DRX cycle of the MTC device in the dormant state can detect the paging channel using a longer DTX period than the legacy UE.
  • This DTX cycle can be pre-configured to the MTC device or notified to the MTC device by the network. When selecting a network notification to the MTC device, each time the network changes this cycle, the corresponding MTC device is notified.
  • FIG. 3 is a schematic diagram showing state switching between an MTC device and a network according to a second embodiment of the present invention.
  • a second embodiment of the present invention will be described in detail with reference to FIG.
  • the event-triggered paging may be a user plane transmission request from the network, such as a NAS report request; or a control plane information acquisition request from the network, such as requiring the MTC device to update the DRX cycle.
  • the MTC device in the normal camping state establishes an RRC connection with the network to respond to the paging, and then the MTC device transitions to the connected mode state.
  • the MTC device feeds back the NAS report to the network.
  • the RRC connection is released, and the normal camping state is returned.
  • the MTC device in the normal camping state can perform paging detection according to the first embodiment of the present invention, and return to the resident sleep mode if no paging is found.
  • the MTC device in the resident sleep mode returns to the normal camp state when it needs to work, that is, under the action of the event-triggered paging, and then enters the connection mode to establish a connection and complete the data. Transfer, report and other tasks ensure that the MTC device can work normally when needed.
  • the MTC device marks the release of the RRC connection and completes the required work, the MTC device immediately switches to the normal camping state, and transitions to the resident sleep mode under the paging detection condition that satisfies the resident sleep, saving system resources.
  • power. 4 is a diagram showing state transitions in an MTC device in accordance with a third embodiment of the present invention.
  • time controlled uplink (UL) data transmission can also trigger the MTC device to migrate from a resident sleep state to a normal resident state.
  • the MTC The device enters the normal park state from the resident sleep state. Since the MTC device needs to perform UL data transmission, it performs the measurement necessary for the cell reselection evaluation process in step S402, and triggers the cell reselection process to select the best cell, which is similar to the operation in the ordinary wireless system.
  • an RRC connection is established for the UL data transmission in step S403, and after the RRC connection is successfully established, the TC device changes to the connected mode state.
  • the MTC device releases the RRC connection with the network in step S405, returning to the normal camping state.
  • the MTC device in the normal camping state may perform paging detection according to the first embodiment of the present invention, returning to the resident sleep mode if no paging is found, as will be understood by those of ordinary skill in the art, in accordance with the present invention.
  • the MTC device can also directly return to the resident sleep mode to save energy.
  • the MTC device Since the activity behavior of the MTC device with low activity is not frequent, after the RRC connection is released, the MTC device directly returns to the resident sleep state, which can further save resource consumption and energy when switching from the normal resident state to the resident sleep state. Consumption.
  • the MTC device can perform the measurement necessary for the cell reselection evaluation process and trigger the cell reselection. process. For example, for the method according to the second embodiment of the present invention, before step S302, the MTC device performs cell reselection, selects the best cell in the current state to provide the service, thereby ensuring that the best for the current MTC device is always provided.
  • FIG. 5 is a diagram showing a state transition between an MTC device and a network according to a fourth embodiment of the present invention.
  • an urgent data transmission is required in the resident sleep state, it is possible to directly switch from the resident sleep state to the connected mode state.
  • step S501 under the emergency uplink data transmission request (step S501), a connection is directly established between the MTC device and the network (step S502), and the MTC device is switched from the resident sleep state to the connected mode, thereby completing data transmission (step S503).
  • FIG. 6 shows an MTC device in accordance with an embodiment of the present invention.
  • the MTC device 600 includes a network and cell selection device 601, a paging channel detecting device 602, a state switching device 603, and a network connection device 604.
  • the MTC device 600 establishes a connection with the network 610 via the network connection device 604.
  • the network and cell selection device 601 performs PLMN selection and cell selection. Through PLMN selection and cell selection, the MTC device 600 determines the cells that can provide services for it.
  • the MTC device 600 After the cell selection is completed, the MTC device 600 enters the normal camping state by the operation of the state switching device 603 under the trigger of the paging channel detecting device 602.
  • the paging channel detecting means 602 detects the paging channel when the MTC device is in the normal camping state, and determines whether there is paging information related to the MTC device: if the paging information related to the MTC device 600 is not found, the state switching device is passed. 603 enters the resident sleep state to save energy; and if the paging information related to the MTC device 600 is detected, the state switching device 603 notifies the network connection device 604 to enter the connection mode, establishes a connection with the network 610, performs normal data transmission, Reports and more.
  • the MTC device 600 releases the RRC connection with the network 610 through the network connection device 604, and the state switching device 603 converts the MTC device 600 to the normal resident state.
  • the MTC device 600 in the dormant state detects an event-triggered page, it can also transition to the normal camping state by the state switching device 603.
  • event-triggered paging may be a user plane transmission request from the network, such as a NAS report request; or a control plane information acquisition request from the network, such as requiring the MTC device to update the DRX cycle, and the like. It should be understood by those of ordinary skill in the art that the description herein is merely illustrative, and the event for triggering paging is not limited thereto.
  • FIG. 7 illustrates another MTC device 600 in accordance with an embodiment of the present invention.
  • the same components are denoted by the same reference symbols. The difference between the embodiment shown in FIG. 7 and FIG. 6 is that the MTC device 600 further includes a time-controlled timing device 605.
  • the time-controlled upstream data transmission can also trigger the MTC device to migrate from the resident sleep state to the normal resident state.
  • the MTC device 600 is switched from the resident sleep state to the normal resident state by the time-controlled timing device 605.
  • the MTC device 600 transitions from the resident sleep state to the normal camp state, for example, when performing uplink data transmission, performing a measurement process and a cell reselection process necessary for the cell reselection evaluation process to select the most Good cell, which is similar to the operation in a normal wireless system.
  • the RRC connection can be established for the uplink data transmission by the network connection device 604.
  • the MTC device 600 is changed to the connected mode state by the state switching device 603.
  • the MTC sets each 600 to release the RRC connection with the network 610 through the network connection device 604, and returns to the normal camping state.
  • the MPC device in the normal camp state continues to perform paging detection, switching between the resident sleep state, the connected mode state, and the normal resident state.
  • the MTC device can also return to the resident sleep mode to save energy.
  • the MTC device in the dormant state may detect the paging channel according to the configured DRC cycle of the MTC device by the paging channel detecting means 602.
  • the MTC device DRX cycle in the dormant state can detect the paging channel using a longer period than the legacy UE. This period can be pre-configured to the MTC device or notified to the MTC device by the network. When the network is notified to the MTC device, the corresponding MTC device is notified each time the network changes this cycle.
  • the transition from resident sleep state to other states includes the following:
  • ⁇ Can be controlled by time-controlled UL data transmission or network-triggered uplink transmission, for example: by paging trigger to trigger state transition from resident sleep state to normal resident state; ⁇ Can be transmitted by emergency UL data To trigger a state transition from the resident sleep state to the connected mode;
  • the downtime can be performed by remote remote control or a preset downtime condition.
  • the method and the MTC device implement the resident sleep mode of the MTC device, and can provide a good sleep state in the idle mode.
  • the method, the MTC device, and the base station according to embodiments of the present invention save power of the MTC device for the following reasons:
  • the MTC device in question only needs to respond to possible network pages; it does not require periodic measurements to perform the cell re-selection evaluation process, and thus does not trigger the corresponding Cell reselection process;
  • the transition from the current normal park state to the new park sleep state is triggered by some operational events, such as timer expiration, etc.
  • the MTC device releases the RRC connection with the network and enters the parked sleep state or the normal park state from the connected mode according to the state before entering the connected mode. For example, if the MTC device transitions from the resident sleep state to the connected mode, the MTC device still transitions to the resident sleep mode after the data transmission; if the MTC device transitions from the normal resident state to the connected mode, the data The MTC device still transitions to the normal resident state after transmission.
  • Advantageous Effects of Invention The RRC-IDLE state user activity behavior currently defined in the prior art is not suitable for the situation of the low mobility MTC device in question. For low mobility MTC devices, the existing RRC-IDLE defined user activity uses too much signaling processing and excessive battery energy requirements.
  • the present invention introduces a new state for the idle mode of the current 3GPP system, and ensures the real-time implementation of the MTC system demand function. At the same time, energy and signaling overhead is saved.
  • the beneficial effects of the present invention are also: introducing, for a low mobility MTC device, an event-triggered measurement necessary for performing a cell reselection evaluation process and a corresponding cell reselection process, thereby selecting one most suitable before each data transmission.
  • the cell sends data to ensure the quality of data transmission.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention porte sur un procédé d'optimisation d'état de gestion des ressources radio (RRC) et sur un dispositif de communication de type machine (MTC). Le procédé d'optimisation d'état RRC comprend les étapes suivantes : exécution d'une sélection de réseau et d'une sélection de cellule ; entrée dans un état de mise en attente normal ; dans l'état de mise en attente normal, surveillance de l'existence ou non d'informations d'appel concernant le dispositif MTC ; si des informations d'appel concernant le dispositif MTC ne sont pas trouvées, entrée dans un état de mise en attente en sommeil ; sinon, entrée dans un état de mode connecté, exécution d'une transmission de données ordinaire, puis retour à l'état de mise en attente normal. Le procédé d'optimisation et le dispositif MTC dans la présente invention introduisent un nouvel état dans le mode veille des systèmes 3GPP actuels, ce qui assure une réalisation immédiate de la fonction requise par le système MTC, et par ailleurs économise l'énergie et réduit le surdébit de signalisation.
PCT/CN2010/000206 2010-02-12 2010-02-12 Procédé d'optimisation d'état de gestion des ressources radio et dispositif de communication de type machine WO2011097766A1 (fr)

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CN201080063167.2A CN102754495B (zh) 2010-02-12 2010-02-12 无线资源控制状态优化方法和mtc设备
PCT/CN2010/000206 WO2011097766A1 (fr) 2010-02-12 2010-02-12 Procédé d'optimisation d'état de gestion des ressources radio et dispositif de communication de type machine

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