WO2011097766A1

WO2011097766A1 - Method for optimizing radio resource control state and device for machine-type communications

Info

Publication number: WO2011097766A1
Application number: PCT/CN2010/000206
Authority: WO
Inventors: 晁华; 汪勇刚; 胡中骥; 陈宇
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2010-02-12
Filing date: 2010-02-12
Publication date: 2011-08-18
Also published as: CN102754495B; CN102754495A; WO2011097766A8

Abstract

A method for optimizing radio resource control (RRC) state and a device for machine-type communications (MTC) are disclosed. The method for optimizing RRC state includes the following steps: executing network selection and cell selection; entering a camped normally state; in the camped normally state, monitoring if any paging information related to the MTC device exists; if paging information related to the MTC device is not found, entering a camped sleep state; otherwise, entering a connected mode state, executing regular data transmission, and then returning to the camped normally state. The optimization method and the MTC device in the present invention introduce a new state into the idle mode of present 3GPP systems, thus ensuring immediate realization of the function required by the MTC system, and meanwhile saving energy and signaling overhead.

Description

Radio resource control state optimization method and MTC device

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. Background technique

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. For the low mobility feature, the following features: 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.

In machine type communication, where low mobility MTC devices transmit small amounts of data over the uplink at fixed times, 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. However, 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.

Based on the above analysis, it can be concluded that the active behavior of the user equipment defined in the RRC-IDLE state (radio resource control idle state) of the prior art is not suitable for the use case in question, and the MTC device needs to be too Heavy signaling throughput, and excessive battery energy requirements.

The various processes and activity behaviors of the idle state user equipment (User Equipment, UE) are defined in Reference 1 and Reference 2. Select the PLMN (Public Land Mobile (Communication) Network) when the UE is down and select A suitable cell in the PLMN is camped on. The UE selects the suitable cell to provide the appropriate service. 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 classification of requirements for MTC communication is defined in reference 3. The problems existing in the existing Radio Access Network (RAN) scheme for MTC communication will be described below. Table 1 first lists the common features of the various uses of the low mobility MTC devices discussed herein.

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.

[Reference 1] 3GPP TS 25. 304, v. 900, UE procedures in idle mode and procedures for cell reselection in connected mode

[Reference 2] 3GPP TS 36. 304, v. 910, E-UTRA, UE procedures in idle mode [Reference 3] 3GPP TS 22. 368, v. Ill, Service requirements for machine-type communications, Aug. 2009 Invention content In order to optimize the activity behavior of the current user equipment defined in the 3GPP RRC_IDLE state to avoid several procedures related to mobility to achieve energy saving, 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;

Enter the normal resident state;

In the normal camping state, the paging channel is detected;

If no relevant paging information is found, the resident sleep state is entered;

If the relevant paging information is detected, the connection mode state is entered, the regular data transmission is performed, and then the normal resident state is returned. Preferably, in the parked sleep state, the paging channel is detected in accordance with the configured discontinuous reception DTX period. Preferably, the DRX cycle is configured or pre-configured by the network. Preferably, the paging channel is detected using a longer DTX period than a conventional user equipment. Preferably, if an urgent data transmission is required in the resident sleep state, 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. Preferably, after establishing a connection between the machine type communication device in the dormant state and the network, switching to the connected mode state. Preferably, in the resident sleep state, when an event is triggered to trigger the paging, the transition to the normal resident state is performed. Preferably, the event triggered paging comprises at least one of the following conditions:

User plane transmission requirements from the network;

Control surface information acquisition requirements from the network. Preferably, in the case where the timing condition of the uplink data transmission timer is satisfied, the resident sleep state is switched to the normal resident state. Preferably, after transitioning from the resident sleep state to the normal camp state, the measurements necessary for the cell reselection evaluation process are performed, thereby triggering the corresponding cell reselection process. Preferably, 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. Preferably, the shutdown operation is performed after entering the resident sleep mode for a predetermined time. According to the technical solution of the embodiment of the present invention, a machine type communication device is further provided, 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,

If the paging information related to the machine type communication device is not found, the state switching device is controlled to enter the resident sleep state by the state switching device;

If paging information associated with the machine type communication device is detected, 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. Preferably, 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. Preferably, the DTX period is configured or pre-configured by the network. Preferably, the paging channel is detected using a longer DTX period than a legacy user equipment. Preferably, if urgent data transmission is required in the resident sleep state, 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. Preferably, 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. Preferably, the event triggered paging comprises at least one of the following conditions:

User plane transmission requirements from the network;

Control surface information acquisition requirements from the network. Preferably, 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. Preferably, after transitioning from the resident sleep state to the normal camp state, the measurements necessary for the cell reselection evaluation process are performed, thereby triggering the corresponding cell reselection process. Preferably, 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. Preferably, the shutdown operation is performed after entering the resident sleep mode for a predetermined time. Compared with the prior art, 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. DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from the Detailed Description of Description

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; A schematic structural diagram of an MTC device according to an 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; and Fig. 8 is a view showing the operation of the terminal device in the prior art. detailed description

Hereinafter, the present invention will be described based on the drawings. In the following description, some specific embodiments are for illustrative purposes only and should not be construed as limiting the invention. Conventional structures or configurations will be omitted when it may result in obscuring the understanding of the present invention. Embodiments of the present invention are primarily concerned with low mobility MTC devices. When 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 There is no need to consume energy to carry out the above activities, thereby achieving the purpose of energy saving. 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:

· There is no measurement necessary to perform the cell reselection evaluation process, and there is no corresponding cell re Selection process

• There are no mobility related processes.

Compared to conventional user equipment, since the network is unable to know the different activity behaviors of the MTC devices in question, it is proposed in the embodiments of the present invention to perform more optimization work in the terminal portion than in the network. Therefore, several possible solutions are given here.

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. The following defines the MTC device activity behavior, the activity behavior of this MTC device will be mainly for low In the case of mobility MTC usage, the RRC-IDLE mode uses this state to do the following:

• The non-access stratum (NAS) 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. 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;

• Listen to the page;

• 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;

• There is no context in which RRC is stored in the RNC (Radio Network Controller) for the UMTS system and the eNB (Enhanced Base Station) for the LTE system.

Therefore, mobility related procedures such as cell update, RA or TA update and handover procedures can be avoided. Moreover, the MTC device in this state does not need to perform the measurements necessary for the cell reselection evaluation process, and thus there is no corresponding cell reselection process. 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.

Normal resident state

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:

• Select and monitor the paging channel based on the information sent in the system information. If no paging information related to the MTC device itself is found, the MTC device enters the parked sleep state to save power;

· Monitoring relevant system information;

• Periodically perform the measurements necessary for the cell reselection evaluation process; perform the cell reselection evaluation process internally by the MTC device to meet the system performance requirements; trigger the execution of the cell re-reduction when the network changes the information for the cell reselection evaluation process Select the evaluation process.

• Whenever an MTC device in a normal park state has uplink data to transmit, do the following:

■ Perform the measurements necessary for the cell reselection assessment process;

■ Perform a cell reselection procedure to select the best cell;

■ Switch to connection mode for uplink data transmission;

■ Release the RRC connection after completing the uplink data transmission.

2. Select any cell status: If the MTC device does not find a suitable cell on the selected PLMN,

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.

3. State residing in any cell: After selecting an operation of any cell, the MTC device resides in any cell selected. In this state, MTC devices can only get limited services. In addition, the MTC device will regularly try to find a suitable cell.

4. Resident sleep

The resident sleep mode is a new state introduced in the idle state in the embodiment of the present invention. 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;

State transitions from the resident sleep state to the normal park state can be triggered in the following ways: ■ Time-controlled uplink transmission;

■ Network-triggered uplink transmissions, for example: triggered by paging.

State transitions from the sleep state to the connected state can be triggered in the following ways:

■ Emergency uplink transmission, if urgent uplink data transmission is required when the sleep state is camped, enter the connection mode directly from the resident sleep state, establish an RRC connection with the network and proceed through the established RRC connection. Uplink data transmission. In this way, the transition from the resident sleep state to the normal resident state is avoided to save RRC connection setup time.

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;

When there is no event-triggered paging from the network, for example: via pre-configuration or via network notification, 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. In the example shown in Figure 2, the MTC device is configured in multiple cells in the network. Figure 2 shows the network and

The entire process of state transition of the MTC device when interacting between MTC devices. Each step and the corresponding MTC device state transition are explained in detail below.

First, after the MTC device is down, the PLMN selection is performed and the cell selection process is completed in step S201. Through PLMN selection and cell selection, the MTC determines the cells that can serve it. The MTC device then enters the normal park state.

In 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. 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. For example, 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.

By introducing a new resident sleep mode for the MTC device, the energy consumption of the MTC device is saved while ensuring the data transmission requirements of the MTC service. 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. Next, a second embodiment of the present invention will be described in detail with reference to FIG. As shown in FIG. 3, in step S301, when the MTC device in the dormant state detects an event-triggered page, it transitions to the normal camping state. 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. 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. When the paging is a NAS report request from the network, in step S302, 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. In step S303, the MTC device feeds back the NAS report to the network. In step S304, after completing the NAS report, 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. According to the embodiment shown in FIG. 3, 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. When 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. And power. 4 is a diagram showing state transitions in an MTC device in accordance with a third embodiment of the present invention. As shown in Figure 4, time controlled uplink (UL) data transmission can also trigger the MTC device to migrate from a resident sleep state to a normal resident state. In the case where the timing condition of the uplink data transmission timer is satisfied, in step S401, 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. After the best cell is selected as the serving cell of the MTC device, 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. After completing the UL data transmission in step S404, 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. In the above second and third embodiments, after the RRC connection is released, the MTC device can also directly return to the resident sleep mode to save energy. 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. In order to ensure the uplink data transmission quality of the MTC device, whenever the MTC device has data to transmit to the network, in the normal camping state, 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. The cell is used for data transmission to ensure the quality of data transmission. With the method according to the third embodiment of the present invention, cell reselection has been performed in step S402. 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. As shown in FIG. 5, if 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. For example, 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). The released RRC connection is released after the data transmission is completed (step S504), and continues to return to the power-saving resident sleep state. FIG. 6 shows an MTC device in accordance with an embodiment of the present invention. As shown in FIG. 6, 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. After the MTC device 600 is down, 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. 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. Finally, after the data transmission is completed, 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. In addition, when 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. Such 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. Next, the MTC device 600 in the normal camping state establishes an RRC connection with the network 610 through the network connection device 604 in response to the paging, and the MTC device 600 transitions to the connected mode state for uplink data transmission. After completing the uplink data transmission, the network connection device 604 releases the RRC connection with the network 610 and converts the MTC device 600 to the resident sleep state by the state switching device 603 to save power. FIG. 7 illustrates another MTC device 600 in accordance with an embodiment of the present invention. In the drawings, 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. In the case where the timing condition of the uplink data transmission timer is satisfied, the MTC device 600 is switched from the resident sleep state to the normal resident state by the time-controlled timing device 605. In addition, after the MTC device 600 according to the embodiment of the present invention 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. After the best cell is selected as the serving cell of the MTC device 600, the RRC connection can be established for the uplink data transmission by the network connection device 604. After the successful establishment, the MTC device 600 is changed to the connected mode state by the state switching device 603. After completing the uplink data transmission, 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. 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 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. For example, 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. In addition, to cover all possible MTC applications in low mobility usage, 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;

■ When designing an MTC application using event-free triggered paging, you can further migrate from resident sleep mode to a shutdown state to further save power. After the power is turned off, the downtime can be performed by remote remote control or a preset downtime condition. For embodiments such as vending machines, smart measurements, and urban automation equipment, in accordance with embodiments of the present invention 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:

■ In this new dwell-sleep state, 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;

■ In the case where no paging is found in the normal park state, 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.

■ After completing the necessary data transfer, 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. In order to optimize the RRC state of the MTC device to obtain new technical features required for the MTC application for the MTC device in the case of low mobility use, 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. The above examples are for illustrative purposes only and are not intended to limit the invention. It will be appreciated by those skilled in the art that various modifications and substitutions may be made to the embodiments without departing from the scope and spirit of the invention. In the scope.

Claims

Rights request

A radio resource control state optimization method, comprising the following steps - performing network selection and cell selection;

Enter the normal resident state;

In the normal camping state, the paging channel is detected;

If no relevant paging information is found, then the resident sleep state is entered:

If the relevant paging information is detected, the connection mode state is entered, the regular data transmission is performed, and then the normal resident state is returned.

The radio resource control state optimization method according to claim 1, wherein, in the resident sleep state, the paging channel is detected according to the configured discontinuous reception DTX cycle.

The radio resource control state optimization method according to claim 2, wherein the DRX cycle is configured or pre-configured by the network.

The radio resource control state optimization method according to claim 2, wherein the paging channel is detected using a longer DTX period than the legacy user equipment.

5. The radio resource control state optimization method according to claim 1, wherein if an urgent data transmission is required in the resident sleep state, the mode is directly switched from the resident sleep state to the connected mode state, and the emergency data is completed. Return to the resident sleep state after transmission.

6. The radio resource control state optimization method according to claim 5, wherein after the connection between the machine type communication device in the dormant state and the network is established, the mode is switched to the connected mode state.

7. The radio resource control state optimization method according to claim 1, wherein, in the resident sleep state, when an event is triggered to trigger paging, transitioning to a normal camping state is performed.

The radio resource control state optimization method according to claim 7, wherein the event triggering Paging includes at least one of the following conditions:

User plane transmission requirements from the network;

Control surface information acquisition requirements from the network.

9. The radio resource control state optimization method according to claim 1, wherein, when the timing condition of the uplink data transmission timer is satisfied, the resident sleep state is switched to the normal resident state.

10. The radio resource control state optimization method according to claim 1, wherein after the dwell state is transferred to the normal dwell state, the measurement necessary for the cell reselection evaluation process is performed, thereby triggering a corresponding cell reselection process.

The radio resource control state optimization method according to any one of claims 1 to 10, wherein, when the task is switched from the normal camping state to the connected mode, the task returns to the normal camping state after the task is completed; When the sleep state is switched to the connected mode to perform the task, the task returns to the sleep state after the task is completed.

The radio resource control state optimization method according to any one of claims 1 to 11, wherein the shutdown operation is performed after entering the resident sleep mode for a predetermined time.

13. A machine type communication device, comprising:

a network and cell selection device, performing network selection and cell selection after the machine type communication device is down;

a paging channel detecting device, detecting a paging channel,

If paging information associated with the machine type communication device is detected, 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 according to claim 13, wherein said machine type communication device in the resident sleep state detects the paging channel in accordance with the configured discontinuous reception DTX period by using the paging channel detecting means.

15. The machine type communication device of claim 14, wherein the DTX cycle is configured or pre-configured by a network.

16. The machine type communication device of claim 14, wherein the paging channel is detected using a longer DTX period than the legacy user equipment.

17. The machine type communication device according to claim 13, wherein the state switching device switches the machine type communication device directly from the resident sleep state to the connection if urgent data transmission is required in the resident sleep state The mode state, and returning to the resident sleep state after the emergency data transmission is completed.

18. The machine type communication device according to claim 17, wherein the machine type communication device is switched to a connected mode state by a state switching device after establishing a connection between the machine type communication device in the dormant state and the network .

19. The machine type communication device according to claim 13, wherein, in the resident sleep state, when the paging channel detecting means detects an event-triggered paging, the machine type communication device is passed through the state switching means Switch to normal parked state.

20. The machine type communication device of claim 13, wherein the event triggered page comprises at least one of the following conditions - a user plane transmission request from a network;

Control surface information acquisition requirements from the network.

21. The machine type communication device according to claim 13, further comprising a time controlled device, wherein the event controlled device determines a timing condition of an uplink data transmission timer, and satisfies the timing bar In the case of the device, the state switching device converts the machine type communication device from a resident sleep state to a normal resident state.

22. The machine type communication of claim 13, wherein the measurements necessary to perform the cell reselection evaluation process are performed after transitioning from the resident sleep state to the normal resident state, thereby triggering a corresponding cell reselection procedure.

The radio resource control state optimization method according to any one of claims 13 to 22, wherein, when the task is switched from the normal camping state to the connected mode, the task returns to the normal camping state after the task is completed; When the sleep state is switched to the connected mode to perform the task, the task returns to the sleep state after the task is completed.

The machine type communication device according to any one of claims 13 to 23, wherein the shutdown operation is performed after a predetermined time of entering the resident sleep mode.