KR20150144250A - Method and apparatus for controlling connection state of user equipment - Google Patents

Abstract

The present invention relates to a method and device for controlling connection state of a terminal for providing the method and device effectively operating a communications module to reduce battery consumption of a communications terminal such as smartphone and machine type communications (MTC) terminal. More specifically, the present invention relates to the method and device for controlling the connection state of the terminal in a communications mode consuming less power for minimizing the battery consumption of the terminal by providing information to change the state of the communications module of the terminal according to a traffic transmission pattern of the terminal and the network.

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for controlling a connection state of a terminal,

More particularly, the present invention relates to a method and apparatus for controlling a connection state of a terminal in a communication mode in which power consumption is reduced in order to minimize battery consumption of the terminal.

With the advent of smartphones, various types of user applications are being serviced. Accordingly, there is a need for a method of increasing battery usage time by efficiently performing various operations within a limited battery while using various services instead of simply making a voice call with a mobile phone.

On the other hand, in case of IoT (Internet of Things) or MTC (Machine Type Communication) terminal which is used for a sensor or a tracking, it has a characteristic that it is difficult to charge or replace the battery once the battery is attached. Such a user terminal needs a method of efficiently using the battery as efficiently as possible so that it can operate for a long time without the intervention of an administrator.

In the case of a terminal having a communication function such as a smart phone or a MTC terminal, much of the power consumed by the terminal is used by the communication module. In particular, the communication module consumes a lot of power when receiving data from the base station or transmitting data to the base station. If the data traffic transmitted by the user terminal has a certain pattern and can predict the idle period or if the user does not need to transmit / receive the traffic for a long period of time, the user terminal temporarily transmits the communication module with low power consumption State to reduce battery consumption.

It is an object of the present invention to provide a method and apparatus for efficiently operating a communication module in order to reduce battery consumption of a communication terminal such as a smart phone and an MTC terminal.

A method for controlling a connection state of a terminal in a wireless communication system of the present invention for solving the above problems comprises determining whether a traffic to be transmitted by the terminal is generated for a preset time of a timer included in a control message received from a base station Transmitting a Signaling Connection Release Indication (SCRI) message to the base station if it is determined that no traffic will be generated as a result of the determination, And changing the RRC connected state of the UE according to the response.

In the wireless communication system of the present invention, a method performed by a base station for controlling a connection state of a terminal includes receiving a signaling connection release indication (SCRI) message from the terminal, Determining an RRC connected state of the terminal based on the information about the traffic occurrence of the terminal; and transmitting an RRC message for changing the state of the terminal to the determined radio resource connection state of the terminal, To the mobile station.

In addition, in the wireless communication system of the present invention, a terminal that performs connection state control determines whether a traffic to be transmitted by the terminal is generated for a preset time of a timer included in a control message received from a communication unit and a base station A Signaling Connection Release Indication (SCRI) message is transmitted to the Node B, and a response for changing the state of the Node B corresponding to the SCRI message is transmitted to the Node B And a controller for changing the RRC connected state of the UE.

A base station for controlling a connection state of a terminal in the wireless communication system of the present invention includes a communication unit for performing data communication and a signaling connection release indication (SCRI) message from the terminal, Determining an RRC connected state of the terminal based on the information about traffic occurrence of the terminal, and transmitting an RRC message for changing the state of the terminal to the determined radio resource connection state of the terminal to the terminal And a control unit for transmitting the control signal.

According to various embodiments of the present invention, in the method and apparatus for changing the state of a terminal according to the present invention, the traffic pattern analysis module of the terminal calculates information for changing the state of the communication module of the terminal according to a traffic transmission pattern of the network and the terminal So that battery consumption of the terminal can be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a simplified illustration of the structure of a wireless communication system,
FIG. 2 illustrates operation of a user terminal according to an embodiment of the present invention; FIG.
3 is a diagram illustrating an operation according to a traffic pattern in a user terminal,
4 is a diagram illustrating an operation of a user terminal determining whether to transmit SCRI according to a traffic pattern analysis result according to the present invention;
5 is a diagram illustrating an operation of a user terminal considering both the pattern observed in the traffic monitoring module and the other traffic transmission conditions,
6 is a diagram illustrating a process in which a user terminal further provides information on a traffic pattern as a RAN to cause a more accurate state change according to an embodiment of the present invention;
7 is a diagram illustrating an operation of a RAN receiving an SCRI message from a user terminal,
8 is a block diagram schematically showing a configuration of a user terminal of the present invention;
9 is a block diagram briefly showing the configuration of the RAN of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

At this point, it will be appreciated that the combinations of blocks and flowchart illustrations in the process flow diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, so that those instructions, which are executed through a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing functions. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory The instructions stored in the block diagram (s) are also capable of producing manufacturing items containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block (s).

In addition, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially concurrently, or the blocks may sometimes be performed in reverse order according to the corresponding function.

Herein, the term " part " used in the present embodiment means a hardware component such as software or an FPGA or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

It is to be noted that, in the following description of the embodiments, the same components are denoted by the same reference symbols as possible in the accompanying drawings. Further, the detailed description of well-known functions and constructions that may obscure the gist of the present invention will be omitted.

Also, in describing embodiments of the present disclosure in particular, the subject matter of the present disclosure is not limited to any other communication system having a similar technical background, for example a GERAN or LTE system, even though the 3GPP UTRAN / It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In this specification and the drawings, 3G network can be used in the same meaning as UTRAN. Also, in the present specification and drawings, the communication control module may correspond to a radio resource control (RRC) layer or a non-access stratum (NAS) in an implementation conforming to the 3GPP standard. Although the timer used for the RRC connection control is referred to as T323 in the embodiment of the present invention, the main point of the present invention is not limited to the timer name. In the embodiments of the present invention, . Also, in the embodiment of the present invention, the value of a counter or a variable used for RRC connection control is referred to as V316, but the main point of the present invention is not limited to a counter / variable name. Other counters / variables with different names may be used in the examples.

Also, in the present specification and drawings, the presence in one network means that the MS is connected to one network, is in a forward access channel (FACH) state, is in a paging channel (PCH) state, Camping in an idle state can be all included. The term base station may also include a base station control node, which may correspond to an RNC for UTRAN, an eNB for E-UTRAN, and a BSC for GERAN.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram schematically illustrating a structure of a wireless communication system. FIG.

A User Equity (UE) 101 is connected to a Radio Access Network (RAN) through a wireless channel to transmit and receive data. If the target system is a 3G network, the RAN corresponds to the UTRAN. At this time, the user terminal is connected to the base station (node B) through a radio channel, and the base station controller (RNC) can control the radio channel. The base station and the base station controller may be physically configured into one entity.

The RAN 103 is connected to the core network 105. If the target system is a 3G network, the core network can be composed of SGSN, GGSN in the PS (Packet Switched) domain, and MSC in the CS (Circuit Switched) domain .

Various servers 107 may be connected to the outside of the provider network. That is, the user terminal 101 is connected to various servers 107 through a provider network including the RAN 103 and the core network 105, and can transmit and receive traffic. Here, various servers may widely include network entities for providing services of the third party service providers, including network entities providing voice calls or SMS (short message service).

The user terminal 101 can access the RAN 103 to send and receive data. The connection mode between the user terminal 101 and the RAN 103 may be referred to as an RRC (Radio Resource Control) connection mode or an RRC connection mode. This connection mode can be largely classified as follows.

● UE idle mode

● RRC connected mode

In addition, the RRC connected mode can be divided into the following detailed states.

● CELL_PCH (or URA_PCH)

● CELL_FACH state

● CELL_DCH state

That is, the RRC connected mode of the UE at the UMTS radio interface includes Cell_DCH, Cell_FACH, Cell_PCH (or URA_PCH), and various active states known as sleep mode. In the Cell_DCH (Dedicated Transport channel) state, a dedicated physical channel is allocated to a user terminal for uplink and downlink transmission.

Also, in the Cell_FACH (Forward Access Channel) state, there is no dedicated physical channel allocated to the user terminal. In this case, the user terminal can continuously monitor the FACH upon downlink transmission. The user terminal is allocated a default common or shared transport channel in the uplink that can be used at any time according to the access procedure for the transport channel.

Also, in the Cell_PCH (Paging Channel), there is no dedicated physical channel allocated to the user terminal, and uplink transmission is also impossible. Therefore, the location of the user terminal can be known by the UTRAN over the cell level according to the cell where the user terminal last performed the cell update procedure. Likewise, in the UTRAN registration area (URA_PCH) state, there is no dedicated channel allocated to the user terminal and uplink transmission is also impossible. The location of the user terminal may be known through the UTRAN registration area level by the URA assigned to the user terminal during the last URA update procedure executed.

Generally, the RRC connected mode consumes more power than the UE idle mode, and the CELL_DCH consumes more power than the CELL_FACH or CELL_PCH state in the RRC connected mode. In general, the CELL_FACH state consumes more power than the CELL_PCH state. On the other hand, in the RRC connected mode, the user terminal 101 does not need to establish an RRC connection when data to be transmitted / received occurs. However, in the UE idle mode, a process of establishing an RRC connection is required when data to be transmitted / received is generated.

The present invention proposes a method for reducing the battery consumption of the user terminal and increasing the availability of the provider network by determining the connection mode and the detailed connection state of the user terminal in consideration of the traffic characteristics of the user terminal. More specifically, if the probability of transmission of the subsequent data traffic is low after the user terminal completes the data transmission / reception, it is informed to the base station control node to cause transition to a low battery consumption state.

2 is a diagram illustrating an operation of a user terminal according to an embodiment of the present invention.

2, when the T323 is included in the RRC message received from the RAN in step 201, the UE stores PS data in the provider network for a predetermined period of time when the T323 is included. It may be determined that the SCRI (Signaling Connection Release Indication) message is allowed to be transmitted.

In operation 203, the user terminal monitors the transmission status of the PS data, and may determine that there is no more PS data during a prolonged period (205). This determination process may be performed directly in the communication module or by receiving a notification from an upper layer.

If the condition is satisfied, in step 207, it is possible to evaluate at least one or more transmission conditions for determining whether the SCRI message can be sent. That is, the UE determines whether the current state (CELL_DCH, CELL_FACH, CELL_PCH / URA_PCH) of the UE, whether the UE has no connection to the CS domain, DRX configuration parameter, whether T323 is not running, It can be judged whether it is small or not.

In step 209, the user terminal can determine whether the SCRI message can be transmitted to the RAN. That is, it is possible to determine whether transmission of the SCRI message is possible based on the SCRI transmission conditions evaluated in step 207. As a result of the determination, if the condition for transmitting the SCRI transmission message is not satisfied, the SCRI message transmission condition may be evaluated by returning to step 207. Alternatively, if the condition for transmitting the SCRI transmission message is not satisfied, It is possible to return to the step to monitor the traffic condition.

If the SCRI message transmission is possible, the UE sets the CN Domain Identity of the SCRI message to the PS domain and the SCRI Cause to the UE Requested PS Data Session end to transmit to the RAN. In Step 211, Start.

Thereafter, in step 213, if the RAN transmits a message for changing the connection mode or the RRC connection state of the user terminal, the user terminal changes the connection mode (UE idle mode) or changes the RRC connection state.

3 is a diagram illustrating an operation according to a traffic pattern in a user terminal.

Referring to FIG. 3, in step 301, the traffic monitoring module of the user terminal monitors a traffic transmission / reception state of an application being performed in the terminal, and analyzes the result to analyze patterns. The traffic monitoring module may be a component in a user terminal implemented in the form of SW or HW and is referred to as a traffic monitoring module in describing an embodiment of the present invention, For example, a control unit, a traffic analyzer, or a connection manager. For the sake of convenience of description, the operation of the present invention will be described by way of example. However, the operation of the present embodiment of the present invention is not limited to the application, but also to all logical elements that generate and receive data traffic such as service, activity, Can be applied.

In step 303, the traffic monitoring module of the user terminal can analyze whether there is PS data based on the collected patterns. If it is predicted that the traffic will no longer occur as a result of the traffic pattern analysis in step 305, the traffic monitoring module transmits the traffic to the communication control module (the same component as the 3GPP modem control part) Information indicating that there is no more data or a data session end has been transmitted. In describing an embodiment of the present invention, a module that receives information indicating that traffic no longer occurs or that a data session is terminated is a communication control module. However, a control unit that controls the operation of a communication unit or a communication unit processes And that the

As a method for predicting that no more traffic will occur in the above determination process, when a timer starts at the last data transmission / reception time and there is no additional data transmission / reception until the timer expires at a preset time, It can be expected that no abnormality will occur.

As a result of analyzing the traffic transmission pattern, if the expectation of the time interval between the last data transmission / reception and the next data transmission / reception (i.e., the inter arrival time of data) is higher than a predetermined threshold value, traffic will no longer occur Can be expected.

Meanwhile, the traffic monitoring module can determine the degree of inactivity of the current user terminal during the traffic pattern analysis process. For example, a high value indicates that the probability of the next traffic transmission / reception is very low after the last traffic transmission, and a small value indicates that the probability of the next traffic transmission / reception is high. Or, the user terminal may grasp it by using an expected value of time until the next traffic is transmitted / received after the last traffic is transmitted. In other words, when the expected value of time is related by associating the two pieces of information, the inactivity level is considered to be high, and if the expected value of time is short, the inactivity level may be considered to be low. When transmitting information indicating that data transmission will no longer occur as described above, the traffic monitoring module may transmit to the communication control module information that can identify the inactivity level or expected value of time until the next traffic arrives have.

Meanwhile, in order to transmit the information between the traffic monitoring module and the communication control module, a method of generating IPC (Inter Processing Communication) may be used, or one module (for example, a traffic monitoring module) (Application Program Interface) provided by the communication control module), and transmitting the information through a parameter.

If it is determined that the PS data is generated as a result of analyzing the traffic transmission pattern in step 305, the traffic monitoring module may return to step 301 to monitor the traffic transmission / reception of the applications and collect patterns.

Upon receiving the information that the traffic will no longer occur, the communication control module may perform the operation from step 407 of FIG.

4 is a diagram illustrating an operation of a user terminal determining whether to transmit SCRI according to a traffic pattern analysis result according to the present invention.

Referring to FIG. 4, in step 401, the communication control module of the user terminal stores T323 if the RRC message provided by the RAN includes T323. In this case, if the T323 is included, the terminal may determine that the SCN (Signaling Connection Release Indication) message is allowed to be transmitted if PS data is not generated in the user terminal for a predetermined period of time.

In step 405, the communication control module of the user terminal determines whether information indicating that traffic no longer occurs (No more data) or data session end is received from the traffic monitoring module. If it is determined that the traffic is no longer generated from the traffic monitoring module or information indicating that the data session is terminated is not received, the normal operation may be performed in step 403. [ Meanwhile, the traffic monitoring module may generate the information and transmit the generated information to the communication control module through the above-described embodiment of FIG. If the information is received, in step 407, the communication control module in the user terminal can evaluate at least one or more transmission conditions for determining whether the SCRI message can be sent. That is, the communication control module determines whether or not the state (CELL_DCH, CELL_FACH, CELL_PCH / URA_PCH) of the user terminal, whether or not it has no connection to the CS domain, DRX setting parameter, whether T323 is not being executed, Or not.

In step 409, the communication control module can determine whether the SCRI message can be transmitted to the RAN. In step 411, if the SCRI message transmission is possible, the communication control module of the user terminal sets the CN Domain Identity of the SCRI message to the PS domain and the SCRI Cause to the UE Requested PS Data Session end to transmit to the RAN and starts T323.

In step 413, if the RAN transmits a message for changing the connection mode or the RRC connection state of the user terminal, the communication control module of the user terminal changes the connection mode (UE idle mode) or the RRC connection state Change it.

Meanwhile, if the traffic that can be observed by the traffic monitoring module is limited (that is, when only a part of the traffic transmitted and received by the user terminal can be observed), the mode of the user terminal or the RRC connection state Changing it can be rather inefficient.

5 is a diagram illustrating an operation of a user terminal considering both the pattern observed in the traffic monitoring module and the other traffic transmission conditions.

Operation of the user terminal is the same as that of FIG. 4 except for step 505, and therefore, the operation of the user terminal in step 505 will be mainly described, and the remaining parts will be replaced with the description of FIG. In step 505, the communication control module of the user terminal can determine whether the traffic monitoring module receives information indicating that traffic no longer occurs (No more data) or data session end (data session end) is received. The traffic monitoring module may generate and transmit the information to the communication control module through the embodiment of FIG. Also, the communication control module of the user terminal can observe whether traffic transmission / reception further occurs until a predetermined timer expires after the last data is transmitted / received. If the information is received from the traffic monitoring module and the traffic control module detects no traffic transmission / reception for a predetermined period of time, the communication control module in the user terminal can determine whether the SCRI message can be transmitted to the RAN. The elements to be considered at this time are the state of the user terminal (CELL_DCH, CELL_FACH, CELL_PCH / URA_PCH), whether the CS domain has no connection, the DRX configuration parameter, whether T323 is not running, Whether it is small.

The operations of the user terminals (steps 511 to 513) are the same as those of steps 411 to 413 of FIG.

6 is a diagram illustrating a process in which a user terminal further provides information on a traffic pattern as a RAN to cause a more accurate state change according to an embodiment of the present invention.

Referring to FIG. 6, in step 601, the communication control module of the user terminal may store T323 if the RRC message provided by the RAN includes T323. In this case, if the T323 is included, the terminal may determine that the SCN (Signaling Connection Release Indication) message is allowed to be transmitted if PS data is not generated in the user terminal for a predetermined period of time.

In step 605, the communication control module of the user terminal determines whether information indicating that traffic no longer occurs (No more data) or data session end is received from the traffic monitoring module.

As a result of the determination, if it is determined that no traffic is no longer generated from the traffic monitoring module or information indicating that the data session is ended is not received, the normal operation can be performed in step 603. [

In step 605, the traffic monitoring module generates the information and transmits the generated information to the communication control module through the embodiment of FIG. Information indicating that the inactivity level of the user terminal can be grasped together with information indicating that the traffic no longer occurs, or information indicating an expected value of time until the next traffic is transmitted or received may be received.

If the information is received, in step 607, the communication control module in the user terminal may evaluate at least one transmission condition for determining whether the SCRI message can be transmitted to the RAN. The transmission conditions include whether or not the state of the user terminal (CELL_DCH, CELL_FACH, CELL_PCH / URA_PCH), the connection to the CS domain, the DRX configuration parameter, whether T323 is not running, .

In step 609, the user terminal can determine whether transmission of the SCRI message is possible. If the SCRI message transmission is possible, the communication control module of the user terminal sets the CN Domain Identity of the SCRI message to the PS domain and the SCRI Cause to the UE Requested PS Data Session end to transmit to the RAN in step 611. If information indicating that the traffic is no longer generated and information indicating an inactivity level of the user terminal or information indicating an expected value of time until the next traffic is received is received, The communication control module may transmit the information together with the SCRI message. In addition, the communication control module of the user terminal starts T323.

According to another modification of the embodiment of the present invention, if the SCRI message transmission is possible, the communication control module of the user terminal sets the CN Domain Identity of the SCRI message to PS domain and the SCRI Cause to the traffic monitoring Information indicating the inactivity level of the user terminal received from the module or information indicating the expected value of time until the next traffic is transmitted / received to the RAN. In addition, the communication control module of the user terminal starts T323.

In step 613, if the RAN transmits a message for changing the connection mode or the RRC connection state of the user terminal, the communication control module of the user terminal changes the connection mode (UE idle mode) or changes the RRC connection state Can be changed.

7 is a diagram illustrating an operation of a RAN receiving a SCRI message from a user terminal.

In step 701, the RAN receives an SCRI message from the user terminal.

In step 703, the RAN determines that there is no traffic transmission to the user terminal for a while when the UE request PS session end cause is included in the SCRI message received from the user terminal. If the RAN determines that there is no traffic transmission for a while, , CELL_PCH / URA_PCH, or UE idle mode).

Or the RAN includes information indicating an inactivity level of the user terminal in the SCRI message received from the user terminal or information indicating an expected value of time until the next traffic is transmitted and received (as described above, May be received in a separate IE from the UE requested PS session end cause or may be received in the form of a value of cause), the RAN may change the inactivity level or next traffic when changing the state of the user terminal from CELL_DCH to another state The expected value of the time until transmission / reception can be considered. For example, if the inactivity level is high or the expectation value of the traffic arrival time is large, it is determined that the RAN can not be transmitted to the user An operation for releasing the RRC connection and changing to the UE idle mode may be performed to reduce the power consumption of the UE. On the other hand, if it is judged that the traffic transmission / reception will not occur for a while based on the information received from the user terminal, but the probability is not high (when the inactivity level is low or the expectation value of the traffic arrival time is small) It is possible to reduce the power consumption of the UE and perform an operation of changing the state of the UE to CELL_FACH in order to reduce the burden of the connection generation process necessary for subsequent traffic transmission.

In the above description, the RAN changes the state of the user terminal by transmitting an RRC message. In step 705, the RAN transmits an RRC message for changing the state of the user terminal to another state (CELL_FACH, CELL_PCH / URA_PCH, or UE idle mode) having lower power consumption than CELL_DCH.

8 is a block diagram briefly showing a configuration of a user terminal of the present invention.

Referring to FIG. 8, the user terminal 800 of the present invention may include a communication unit 801 and a control unit 803. Also, the control unit of the user terminal 800 according to the present invention may include a traffic monitoring unit 805 for monitoring traffic of the terminal. The control unit (and the traffic monitoring unit) may be viewed as a higher layer to the communication unit. That is, in applying the present invention and the embodiments, an upper layer of the communication unit (communication control module) may refer to a control unit (traffic monitoring unit).

The communication unit 801 may be a module for performing data communication of a terminal. In this specification, for convenience of description, it is specified that the communication unit 801, the communication module, or the communication control module can be used in combination.

The control unit 803 can control the overall operation of the terminal 800 including the communication unit 801. [ For convenience of description, the control unit 803, the traffic monitoring unit 805, the traffic monitoring control module, or the traffic monitoring control module may be used in the present specification. Alternatively, the controller 803 may be referred to as a connection manager.

Although only the communication unit 801 and the control unit 803 are shown in FIG. 8 for the convenience of description, it is to be understood that various modules may be subdivided or combined into one module according to the operation and function of the terminal. Specifies that the technician can design selectively.

The control unit 803 determines whether or not a traffic to be transmitted by the terminal is generated for a preset time of a timer included in a control message received from the base station. If it is determined that no traffic will be generated, And transmits a Signaling Connection Release Indication (SCRI) message to the base station. The RRC connected state of the UE can be changed according to a response to change the state of the base station corresponding to the SCRI message.

In addition, the controller 803 may collect a traffic generation pattern from the traffic transmission / reception state of the application performed in the terminal, and may determine whether or not traffic is generated by the terminal based on the collected pattern.

In addition, the control unit 803 judges that no traffic will occur if additional data transmission / reception does not occur until the predetermined time of the arbitrary timer starts, when an arbitrary timer starts at the time of the last data transmission / reception of the application can do.

In addition, the controller 803 may determine that no traffic will occur when the time interval between traffic transmission and reception of the application is higher than a predetermined threshold.

Also, the controller 803 can determine the inactivity level of the terminal by determining the possibility of traffic of the application from the collected pattern, and the SCRI message can determine the inactivity level of the terminal The SCRI message may include information on an expected value of time until a next traffic is transmitted / received after an arbitrary traffic is transmitted.

In this case, the condition for transmitting the SCRI message includes a condition of a radio resource connection (RRC connected) state of the UE, a CS (Circuit Switched) domain, discontinuous reception (DRX) configuration parameters of the UE, and whether to execute any timer for transmission of an SCRI message.

9 is a block diagram briefly showing the configuration of the RAN of the present invention.

In FIG. 9, the RAN 900 may correspond to any of a wireless network, a wireless network node, a base station, and a network control node having a communication function such as an eNB. Although only the communication unit 901 and the control unit 903 are illustrated in the present specification for the sake of convenience of description, it is to be understood that various modifications may be made to the various modules or may be combined into one module according to the operations and functions. As shown in Fig.

The communication unit 901 may be a module for performing data communication of a terminal. In this specification, for convenience of description, it is specified that the communication unit 901, the communication module, or the communication control module can be used in combination.

The control unit 903 can control the overall operation of the RAN 900 including the communication unit 901. [

The control unit 903 receives a Signaling Connection Release Indication (SCRI) message from the UE, and transmits a signaling connection release indication (SCRI) message to the UE through the RRC connected ) State, and may transmit an RRC message for changing the state of the UE to the determined radio resource connection state of the UE to the UE.

In addition, the controller 903 can change the state of the terminal to a state in which power consumption is low, when the idle level is higher than a predetermined value.

If the expected value is higher than a preset value, the controller 903 can change the state of the terminal to a state in which power consumption is low.

Although only the communication unit 901 and the control unit 903 are shown in FIG. 9 for the convenience of description, it is to be understood that various modules may be subdivided into one module or a single module according to the operation and function of the terminal, Specifies that the technician can design selectively.

Meanwhile, in the above embodiments of the present invention, the traffic monitoring unit 805 monitors the traffic status of various service applications executed in the user terminal and adjusts the rate of synchronizing the operation, for example, .

On the other hand, in embodiments of the present invention, a probability distribution can be used to predict whether the next traffic (or packet) is generated (hereinafter, the same meaning is used for generation and arrival) for the user terminal. To this end, the traffic monitoring unit in the user terminal measures a time when a traffic (or a packet) is generated every time a traffic (or a packet) is generated, and a statistical distribution on the arrival time of the traffic I ask.

를 구하는 것일 수 있다. 이러한 통계적인 분포들은, 현재로부터 시작하여 정해진 시간 간격을 갖는 과거를 기준으로 또는 정해진 수의 샘플을 기준으로 또는 가장 최근의 특정 갯수의 샘플을 기준으로 구하는 것일 수 있다.In an embodiment of the present invention, obtaining a statistical distribution may be to obtain an average and a standard deviation. Also in an embodiment of the present invention, the statistical distribution of the time at which traffic (or packet) arrives may be a statistical distribution of the inter-arrival time at which the traffic (or packet) arrives . In addition, in the embodiment of the present invention, the statistical distribution of the arrival time of traffic (or packet) is obtained by calculating the number (n) of traffic (or packets) generated during a predetermined time interval ), That is, arrival rate expressed in n / T

. ≪ / RTI > These statistical distributions may be based on a past having a predetermined time interval starting from the present, or on the basis of a predetermined number of samples or on the most recent specific number of samples.

That is, a window for observing occurrence of traffic (or packet) for obtaining the statistical distributions is characterized by moving. The size of the window is characterized by having a settable value.

The observation of the arrival time of the traffic (or packet) and the statistical distribution can be performed separately for all the traffic of the user terminal, for each service application, PDN context (PDP context), or IP flow . Further, in the embodiment of the present invention, it is possible to observe the time at which the traffic (or packet) arrives, and obtain a statistical distribution therefor, selectively only for some traffic (or packet).

In addition, in the embodiment of the present invention, the time when the traffic (or packet) arrives and the statistical distribution thereof is obtained is obtained by separating the uplink traffic and the downlink traffic, And can be separately classified. On the other hand, if the synchronization function is applied to the traffic (packets) in the user terminal, the statistical distribution of the arrival time of the traffic (packet) is obtained by using the traffic (or packet) . ≪ / RTI >

In an embodiment of the present invention, it may be assumed that when the statistical distribution is obtained, the process of generating traffic (or packet) follows a Poisson arrival process. In the embodiment of the present invention, when the statistical distribution is obtained, it can be assumed that the time interval of the generated traffic (or packet) follows an exponential distribution.

When a traffic (or packet) is generated (transmitted or received), the traffic monitoring unit of the user terminal monitors traffic of the next traffic (or traffic) for a predetermined time (t) according to a statistical distribution of the arrival time of the previously obtained traffic (Or packet) will not occur if the probability that the packet (or packet) occurs m times (or m times) is less than P,

Here, the probability P of occurrence of the next traffic can be obtained by using the following equation (1).

P can be calculated using Equation (1) above, the calculated P can be compared with a predetermined reference value p, and it can be determined that the probability of occurrence of traffic (or packet) is small (or small or equal). In particular, when calculating P using the above equation, 1 can be used as the value of m. According to this determination, the user terminal can determine that the PS data session has been terminated, and can also perform an operation for changing the RRC connection state, that is, an operation for transmitting the SCRI message, based on the PS data session. This process can be implemented by notifying the upper layer (traffic monitoring module) of the user terminal structure that the data transmission / reception to the user terminal is completed by the lower layer (communication control module), or notifying the user terminal to release the RRC connection.

Meanwhile, as described above, the embodiments of the present invention can be applied to a user terminal accessing a network other than a 3G (UTRAN) network, for example, an LTE (E-UTRAN) network. If the embodiments of the present invention are applied to a user terminal accessing an LTE network, the layer in which the operation is performed is changed (for example, a request message for changing the connection state is sent from the NAS instead of RRC) (E.g., UE Assistance Information message or RRC Release Request message instead of the SCRI message of the RRC layer), or some steps / operations of embodiments of the present invention may be omitted or reordered.

If the user terminal uses the E-UTRAN network, the user terminal may transmit a request message to the base station to change the connection state. This operation is performed in accordance with embodiments of the present invention, in which information indicating that an upper layer (traffic monitoring unit or NAS layer) has completed transmission and reception of traffic, a PS data session has been terminated, user inactivity, or RRC connection release is required (RRC layer) to the communication control unit (RRC layer).

In an upper layer, it may be determined by embodiments of the present invention to determine whether to announce one or more of the above information. The user terminal can use the UE Assistance Information message as a request message, which includes information indicating that the transmission / reception of traffic has ended, the PS data session has been terminated, RRC connection release is required, user inactivity, or low power consumption is required One or more may be included.

Upon receiving the message including the information from the user terminal, the base station transmits an RRC connection release message to the user terminal, that is, an RRC connection release message to the user terminal, and transmits a request message to release the UE context to the MME Lt; / RTI > Meanwhile, the UE Assistance Information may be replaced with an RRC connection release request message.

Alternatively, the information may not be a separate control message transmitted from the user terminal to the base station, but may be included in a header or a control element used when the user terminal transmits a user plane data packet. Meanwhile, the base station may suspend the RRC connection release until the user plane data transmission / reception to the user terminal is terminated.

In a variation of the instant embodiment, if the user terminal uses an E-UTRAN network, the user terminal may send a request message to the MME to change the connection state. This operation is performed in accordance with the embodiments of the present invention. At least one of the information indicating that the upper layer (traffic monitoring unit) has completed the traffic transmission / reception, the PS data session has been terminated, the user inactivity, or the RRC connection release is required To the communication control unit (NAS layer).

In an upper layer, it may be determined by embodiments of the present invention to determine whether to inform one or more of the above information. The user terminal may use the NAS message as a request message, which may include one or more of the information indicating that the transmission / reception of traffic has ended, the PS data session has been terminated, the RRC connection is required to be released, user inactivity, or low power consumption May be included.

In one embodiment of the present invention, the NAS message may be an EMM status message, indicating that the traffic transmission / reception has ended, the PS data session has expired, RRC disconnect is required, user inactivity, or low power consumption is indicated The information may be included in the EMM cause information element.

Upon receiving the NAS message including the information from the user terminal, the MME performs an operation to release the RRC connection to the user terminal. Releasing the RRC connection to the user terminal may mean that the MME releases the logical connection associated with the user terminal, and for this purpose the MME may send a UE context release command message to the base station. This message may include one of traffic transmission / reception terminated due to disconnect, PS data session terminated, RRC disconnect required, user inactivity, or information indicating that low power consumption is required.

If the base station receives the UE context release command message from the MME, the base station performs an operation to release the RRC connection to the user terminal. If the message received by the base station includes one of the traffic transmission / reception termination, the PS data session termination, the RRC connection release required, user inactivity, or information indicating that low power consumption is required, It is possible to perform an operation to wait until the user plane data transmission / reception for all the user plane data is completed and to release the RRC connection.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And is not intended to limit the scope of the invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are illustrative and explanatory and are intended to provide further explanation of the invention as claimed. no. It should also be understood that the embodiments of the present invention described above are merely illustrative, and that those skilled in the art will be able to make various modifications and equivalent embodiments. Accordingly, the true scope of the present invention should be determined by the following claims.

800 terminal
801:
803:
805: Traffic monitoring unit

Claims (26)

A method of controlling a connection state of a terminal in a wireless communication system,
Determining whether a traffic to be transmitted by the terminal is generated for a preset time of a timer included in a control message received from the base station;
Transmitting a signaling connection release indication (SCRI) message to the base station if it is determined that no traffic will be generated;
And changing a RRC connected state of the UE according to a response for changing the state of the BS corresponding to the SCRI message. The method as claimed in claim 1, wherein the step of determining whether to generate a traffic to be transmitted by the terminal during a preset time of a timer included in a control message received from the base station,
Collecting a traffic generation pattern from a traffic transmission / reception state of an application performed in the terminal; And
And determining whether to generate traffic to be transmitted by the terminal based on the collected patterns. 3. The method of claim 2, wherein determining whether to generate traffic to be transmitted by the terminal based on the collected patterns comprises:
And judges that no traffic will occur if additional data transmission / reception does not occur until a predetermined timer of the arbitrary timer is completed by starting an arbitrary timer at the time of the last data transmission / reception of the application. Connection state control method. 3. The method of claim 2, wherein determining whether to generate traffic to be transmitted by the terminal based on the collected patterns comprises:
And determining that no traffic will occur if a time interval between traffic transmission and reception of the application is higher than a preset threshold value. 3. The method of claim 2,
Determining an inactivity level of the terminal by determining the traffic occurrence possibility of the application from the collected patterns,
Wherein the SCRI message includes information for determining an inactivity level of the UE. The method according to claim 2, wherein
Determining an inactivity level of the terminal by determining the traffic occurrence possibility of the application from the collected patterns,
Wherein the SCRI message includes information on an expected value of time until a next traffic is transmitted / received after a certain traffic is transmitted. The method as claimed in claim 1, wherein, if it is determined that no traffic will be generated, the step of transmitting a signaling connection release indication (SCRI) message to the base station,
Further comprising: determining whether a condition for transmitting the SCRI message is satisfied,
The conditions for transmitting the SCRI message include:
(RRC connected state), whether or not the UE is connected to a Circuit Switched (CS) domain, discontinuous reception (DRX) setting parameters of the UE, or execution of an arbitrary timer for transmission of an SCRI message Whether or not the terminal is connected to the terminal. 2. The method of claim 1, wherein the RRC connected state of the UE comprises:
Wherein the mobile station is one of a Cell_DCH (Dedicated Transport channel), a Cell_FACH (Forward Access Channel), a Cell_PCH (Paging Channel), or a UE idle mode. A method performed by a base station for controlling a connection state of a terminal in a wireless communication system,
Receiving a signaling connection release indication (SCRI) message from the terminal;
Determining a radio resource connection (RRC connected) state of the UE based on information on traffic occurrence of the UE included in the SCRI message; And
And transmitting an RRC message for changing a state of the UE to the determined radio resource connection state of the UE to the UE. The method as claimed in claim 9,
And information about an expected value of time until the next traffic is transmitted / received after an inactivity level of the terminal or an arbitrary traffic transmission is performed by the base station. The method as claimed in claim 10, wherein the step of determining a radio resource connection (RRC connected) state of the terminal based on information on traffic generation of the terminal included in the SCRI message comprises:
And changes to a state where the power consumption of the terminal is low when the idle level is higher than a preset value. The method as claimed in claim 10, wherein the step of determining a radio resource connection (RRC connected) state of the terminal based on information on traffic generation of the terminal included in the SCRI message comprises:
And changing the state of the terminal to a state of low power consumption when the expected value is higher than a preset value. 10. The method of claim 9, wherein the RRC connected state of the UE comprises:
Characterized in that the method is one of a Cell_DCH (Dedicated Transport channel), a Cell_FACH (Forward Access Channel), a Cell_PCH (Paging Channel), or a UE idle mode. A terminal for performing connection state control in a wireless communication system,
A communication unit for performing data communication; And
The method comprising: determining whether a traffic to be transmitted by the terminal is generated for a preset time of a timer included in a control message received from the base station; and if it is determined that no traffic will be generated, A Connection Release Indication message to a base station and changing a radio resource connection state of the mobile station according to a response for changing a state of the base station corresponding to the SCRI message. 15. The apparatus of claim 14,
Collects a traffic generation pattern from a traffic transmission / reception state of an application performed in the terminal, and determines whether to generate traffic to be transmitted by the terminal based on the collected pattern. 16. The apparatus of claim 15,
And judges that no traffic will occur if no additional data transmission / reception occurs until the predetermined time of the arbitrary timer is completed by starting an arbitrary timer at the time of the last data transmission / reception of the application. 16. The apparatus of claim 15,
And judges that no traffic will occur when the time interval between traffic transmission and reception of the application is higher than a preset threshold value. 16. The apparatus of claim 15,
Determining an inactivity level of the terminal by determining the traffic occurrence possibility of the application from the collected patterns,
Wherein the SCRI message includes information for determining an inactivity level of the UE. 16. The apparatus of claim 15,
Determining an inactivity level of the terminal by determining the traffic occurrence possibility of the application from the collected patterns,
Wherein the SCRI message includes information on an expected value of time until a next traffic is transmitted / received after an arbitrary traffic is transmitted. 15. The apparatus of claim 14,
Further determining whether a condition for transmitting the SCRI message is satisfied,
The conditions for transmitting the SCRI message include:
(RRC connected state), whether or not the UE is connected to a Circuit Switched (CS) domain, discontinuous reception (DRX) setting parameters of the UE, or execution of an arbitrary timer for transmission of an SCRI message Whether or not at least one of the terminal and the terminal is connected to the terminal. 15. The method of claim 14, wherein the RRC connected state of the UE comprises:
Wherein the UE is one of a Cell_DCH (Dedicated Transport channel), a Cell_FACH (Forward Access Channel), a Cell_PCH (Paging Channel), or a UE idle mode. A base station for controlling a connection state of a terminal in a wireless communication system,
A communication unit for performing data communication; And
Receives a signaling connection release indication (SCRI) message from the terminal, and determines a radio resource connection (RRC connected) state of the terminal based on information on the traffic generation of the terminal included in the SCRI message And a controller for transmitting an RRC message for changing a state of the UE to a radio resource connection state of the determined UE. 23. The method of claim 22, wherein the information about the traffic occurrence of the terminal comprises:
And information on an expected value of a time until an inactivity level of the terminal or an inactivity level or a traffic is transmitted and received after a certain traffic is transmitted. 24. The apparatus of claim 23,
When the idle level is higher than a preset value, changes the state of the terminal to a state in which power consumption is low. 24. The apparatus of claim 23,
And changes the state of the terminal to a state in which power consumption is low when the expected value is higher than a preset value. 23. The method of claim 22,
The radio resource connection (RRC connected)
Wherein the base station is one of a Cell_DCH (Dedicated Transport channel), a Cell_FACH (Forward Access Channel), a Cell_PCH (Paging Channel), or a UE idle mode.

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