KR101731345B1 - Method for receiving sms at dual mode device and apparatus therefor - Google Patents

Abstract

A method for receiving an SMS from a dual mode terminal in a wireless communication system, the method comprising: receiving first time information from a first communication network; receiving second time information from a second communication network; Calculating and storing an error average of the first time information and the second time information based on the time average of the time information included in the SMS message received from the second communication network, And setting the time information of the time stamp.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for receiving an SMS message in a dual mode terminal,

The present invention relates to a dual mode terminal. More particularly, the present invention relates to a Short Message Service (SMS) receiving method and apparatus therefor in a dual mode terminal.

In the wireless mobile communication field, not only voice communication but also data transmission and reception have been steadily evolving. Currently, 4th generation mobile communication technology, for example, LTE (Long Term Evolution) wireless communication system is attracting attention. However, in the situation where the fourth generation communication network and the third generation communication network that have been commercialized are mixed, the mobile communication terminal or the mobile communication data card is not only used for the fourth generation mobile communication technology but also for the 3G mobile communication technology At the same time. Accordingly, a mobile terminal or a data card type device (hereinafter referred to as a dual mode terminal) having a dual modem processor is required to simultaneously support the next generation mobile communication technology and the existing generation mobile communication technology.

The dual mode terminal is equipped with two modems having different communication methods and supports wireless communication using each of them, and is mainly used in a region where heterogeneous communication networks are mixed. 2. Description of the Related Art As a typical example of a dual-mode terminal, a device that can use both LTE (Long Term Evolution) wireless communication and CDMA (Code Division Multiple Access) wireless communication is attracting attention. In the present invention, a multi-mode device capable of communicating with both the LTE network and the CDMA network is assumed, but other types of wireless communication can also be applied to those skilled in the art. It is true.

It is an object of the present invention to provide an SMS receiving method and an apparatus therefor in a dual mode terminal.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

A method for receiving a short message service (SMS) in a dual mode terminal in a wireless communication system, the method comprising: receiving first time information from a first communication network; Receiving second time information from a second communication network; Calculating and storing an error average of the first time information and the second time information; And setting a value of the time information included in the SMS to the time information of the SMS received from the second communication network when the SMS is received from the second communication network, 1 communication network is a CDMA (Code Division Multiple Access) communication network, and the second communication network is an LTE (Long Term Evolution) communication network. Further, it is assumed that when an SMS is received from the LTE communication network, signal transmission / reception with the CDMA communication network is impossible.

More preferably, when the time information of the SMS from the LTE communication network is earlier than the time information of the SMS previously received, the time information of the SMS is set as the time information of the immediately received SMS from the LTE communication network The method comprising the steps of:

According to another aspect of the present invention, there is provided a method of receiving a short message service (SMS) in a wireless communication system, the method comprising: receiving a Short Term Service (LTE) signal in an area where signal transmission / reception is impossible with the Code Division Multiple Access Receiving an SMS from an Evolution network; Obtaining time information included in the SMS; And setting a reception time stamp by reflecting the estimated transmission time from the LTE communication network to the dual mode terminal to the time information, wherein the estimated transmission time is determined based on the base station information on which the transmitter is located and the dual mode terminal And is a value that is statistically calculated using the connected base station information.

According to an aspect of the present invention, a dual mode terminal of a wireless communication system includes a first wireless communication unit for transmitting and receiving signals from a CDMA (Code Division Multiple Access) communication network; A second wireless communication unit for transmitting and receiving signals from an LTE (Long Term Evolution) communication network; And a processor for processing a signal received from the LTE communication network and a signal received from the CDMA communication network, wherein the processor is configured to receive the first time information received from the CDMA communication network and the second time information received from the LTE communication network And calculates a value reflecting the error averaging on the time information included in the SMS when the SMS receives the Short Message Service from the LTE communication network as time information of the SMS received from the LTE communication network . Preferably, when the time information of the SMS from the LTE communication network is earlier than the time information of the SMS received immediately before, the processor transmits the time information of the SMS from the LTE communication network to the time Information is set.

According to another aspect of the present invention, a dual mode terminal of a wireless communication system includes a first wireless communication unit for transmitting and receiving signals from a CDMA (Code Division Multiple Access) communication network; A second wireless communication unit for transmitting and receiving signals from an LTE (Long Term Evolution) communication network; And a processor for processing a signal received from the LTE communication network and a signal received from the CDMA communication network, wherein when receiving an SMS from an LTE communication network in an area where signal transmission / reception with the CDMA communication network is impossible, Acquires time information included in the SMS, sets a reception time stamp by reflecting the estimated transmission time from the LTE communication network to the time information, and sets the reception time stamp, And a value statistically calculated using base station information to which the dual mode terminal is connected.

1 is a diagram conceptually showing a network structure of an E-UMTS.
2 is a conceptual diagram illustrating a network structure of an evolved universal terrestrial radio access network (E-UTRAN).
3 and 4 illustrate a control plane and a U-Plane (User-Plane) structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard Fig.
5 is a diagram illustrating a structure of a dual mode terminal of the present invention.
6 is a diagram illustrating an SMS receiving method in a conventional terminal device supporting only a CDMA communication network.
7 is a diagram for explaining a problem that may occur in a general dual mode terminal device,
8 is a diagram illustrating an SMS receiving method in a dual mode terminal according to an embodiment of the present invention.
9 is a diagram illustrating an SMS receiving method in a dual mode terminal according to another embodiment of the present invention.
10 illustrates a block diagram of a terminal device according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, the following detailed description assumes that the main mobile communication system is a 3GPP LTE system, but it is applicable to any other mobile communication system except for the specific aspects of 3GPP LTE.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

In the following description, it is assumed that the UE collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment) and an MS (Mobile Station). It is also assumed that the base station collectively refers to any node of a network end that communicates with a terminal such as a Node B, an eNode B, and a base station.

Prior to describing the present invention, the Evolved Universal Mobile Telecommunications System (E-UMTS), which is a technical field to which the present invention is applied, and related technical features will be described below.

1 is a diagram conceptually showing a network structure of an E-UMTS. In particular, the E-UMTS system has evolved from the existing WCDMA UMTS system, and is currently undergoing basic standardization work in the 3rd Generation Partnership Project (3GPP). E-UMTS is also called Long Term Evolution (LTE) system. For details of the technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of "3rd Generation Partnership Project (Technical Specification Group Radio Access Network)" respectively.

Referring to FIG. 1, an E-UMTS is an Access Gateway (hereinafter referred to as AG) located at the end of a UE, a cell (eNB), and a network (E-UTRAN) . Typically, an eNB may simultaneously transmit multiple data streams for broadcast services, multicast services, and / or unicast services. An interface for transmitting user traffic or control traffic may be used between eNBs.

The AG may be divided into a part for handling user traffic and a part for processing control traffic. At this time, a new interface between the AG for processing new user traffic and the AG for processing control traffic can be communicated with each other. Also, the AG manages the mobility of the UE in a TA (Tracking Area) unit, and the TA is composed of a plurality of cells. If the terminal moves from one TA to another TA, it informs AG that the TA where it is located has changed.

The CN (Core Network) can be configured as a network node for user registration of AG and UE. An interface for distinguishing E-UTRAN and CN may be used.

2 is a conceptual diagram illustrating a network structure of an evolved universal terrestrial radio access network (E-UTRAN).

Referring to FIG. 2, the E-UTRAN system is an evolved system in an existing UTRAN system. The E-UTRAN is composed of cells (eNBs), and the cells are connected via the X2 interface. The cell is connected to the terminal through the air interface, and is connected to the EPC (Evolved Packet Core) through the S1 interface.

EPC is composed of MME (Mobility Management Entity), S-GW (Serving-Gateway) and PDN-GW (Packet Data Network-Gateway). The MME has information on the access information of the terminal or the capability of the terminal, and this information is mainly used for managing the mobility of the terminal. The S-GW is a gateway having an E-UTRAN as an end point, and the PDN-GW is a gateway having a PDN (Packet Data Network) as an end point.

3 and 4 illustrate a control plane and a U-Plane (User-Plane) structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard Fig. In particular, the wireless interface protocol consists of a physical layer, a data link layer, and a network layer vertically, and horizontally includes a user plane for data information transmission and a control plane And a control plane for signal transmission.

The protocol layers of FIGS. 3 and 4 are based on an Open System Interconnection (OSI) reference model widely known in communication systems. The lower three layers are referred to as L1 (first layer), L2 (second layer) , And L3 (third layer).

The control plane is a path through which control messages used by the UE and the network to manage calls are transmitted. The user plane means a path through which data generated in the application layer, for example, voice data or Internet packet data, is transmitted. Hereinafter, the layers of the control plane and the user plane of the wireless protocol will be described.

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to the upper layer of Medium Access Control (MAC) layer through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. Data is transferred between the transmitting side and the receiving side physical layer through the physical channel. The physical channel is modulated by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

The MAC layer of the second layer provides a service to a radio link control (RLC) layer, which is an upper layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a function block inside the MAC. In this case, the RLC layer may not exist. The Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information for efficient transmission in an air interface having a narrow bandwidth when transmitting IP packets such as IPv4 or IPv6 .

A Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only on the control plane and includes a configuration, reconfiguration, and release of radio bearers (RBs) And controls the logical channels, the transport channels, and the physical channels. The radio bearer means a service provided by the second layer for data transmission between the UE and the E-UTRAN. To this end, the RRC layer exchanges RRC messages between the UE and the network.

In FIG. 3, the Non-Access Stratum (NAS) layer at the top of the RRC layer performs functions such as session management and mobility management. The NAS layer exists in the Mobility Management Entity (MME) of the UE and the network.

The MME is a key control-node in an LTE access network. The MME is responsible for the tracking and paging procedures for the terminals in the idle state. In addition, the MME participates in the radio bearer activation / deactivation process and is responsible for selecting a Serving Gateway (SGW) at the time of 'Initial Attach' or during an intra-LTE handover including a core network relocation. It is. The MME takes charge of terminal authentication through interaction with a Home Subscriber Server (HSS). The NAS signaling is terminated at the MME, and the MME is responsible for creating and assigning a temporary identifier to the terminal. The MME verifies that the terminal has the authority to camp-on the service provider's PLMN (Public Land Mobile Network). MME is the endpoint for encryption / integrity protection for NAS signaling in the network and is responsible for security key management. The MME provides a control plane function for mobility between LTE and 2G / 3G access networks.

In the NAS layer, two states of EMM (EPS Mobility Management) registration state (EMM-REGISTERED) and EMM unregistered state (EMM-UNREGISTERED state) are defined for terminal mobility management, and these states are applied to the terminal and the MME. The initial terminal is an EMM unregistered state, and the terminal performs a process of registering with the network through an initial attach procedure to access the network. When the contact procedure is successfully performed, the terminal and the MME are in the EMM registration state.

In the NAS layer, two types of ECM (EPS Connection Management) idle state (ECM_IDLE) and ECM connection state (ECM_CONNECTED) are defined to manage a signaling connection between a terminal and an EPC. . When the UE in the ECM idle state establishes the RRC connection with the E-UTRAN, the UE enters the ECM connected state. ECM The MME in the idle state is connected to the ECM when it makes an S1 connection with the E-UTRAN. When the UE is in the ECM idle state, the E-UTRAN has no context of the UE. Therefore, the terminal in the ECM idle state performs terminal-based mobility-related procedures such as cell selection or cell re-selection procedure without receiving commands from the network. On the other hand, when the terminal is in the ECM connection state, the mobility of the terminal is managed by a command of the network. If the position of the terminal differs from the position known to the network in the ECM idle state, the terminal informs the network of the corresponding position of the terminal through a TA update (Tracking Area Update) procedure.

5 is a diagram illustrating a structure of a dual mode terminal of the present invention.

5, a dual mode terminal may include an application processor and an LTE processor for processing signals received from the LTE network and a CDMA processor for processing signals received from the CDMA network.

The application processor may be configured as a single hardware module in the dual mode terminal, or may be included in the PC and configured independently of the dual mode terminal. In addition, the application processor may include a connection manager (CM) for managing and controlling the connection status to the CDMA network or the LTE network depending on the network environment.

More specifically, the CM performs a switching function for transmitting and receiving data between the application and one of the two processors (CDMA processor or LTE processor) according to the network connection state. That is, when the dual mode terminal is connected to the CDMA network, application data is transmitted / received through the A interface so that the CDMA processor and the application are connected to each other. When the dual mode terminal is connected to the LTE network, The application sends and receives to the B interface to be connected.

The host interface is located between the CDMA processor and the LTE processor and can be used for transmission of control signals and data signals between the processors.

6 is a diagram illustrating an SMS receiving method in a conventional terminal device supporting only a CDMA communication network.

Referring to FIG. 6, a conventional terminal device supporting only signal transmission / reception with a CDMA communication network receives time information from a CDMA communication network of a synchronous type to acquire time synchronization as in step 601. FIG. Thereafter, when the SMS is received from the CDMA communication network in step 602, it is possible to display the time at which the SMS was received based on the acquired time synchronization, that is, the time stamp, to the user in step 603.

7 is a diagram for explaining a problem that may occur in a general dual mode terminal apparatus.

Referring to FIG. 7, in order to set the system time, even in the case of a dual mode terminal apparatus, time synchronization is acquired on the basis of the CDMA communication network of the synchronous type Phone time. Therefore, if the terminal apparatus is not connected to the CDMA communication network at the time of initial operation, the system time of the terminal apparatus can not acquire time synchronization.

However, if the dual mode terminal can not access the CDMA communication network, it is highly likely that the dual mode terminal is located in an area where connection with the LTE communication network is possible, so that SMS reception from the LTE communication network is possible. Of course, the LTE communication network transmits time information but differs from the time information transmitted in the CDMA communication network. Since the LTE communication network is basically asynchronous, the time at which the dual mode terminal receives the SMS, that is, the time stamp is inaccurate Problems may arise.

Hereinafter, an SMS receiving method in a dual mode terminal apparatus for solving such a problem will be described.

8 is a diagram illustrating an SMS receiving method in a dual mode terminal according to an embodiment of the present invention. It is assumed that the dual mode terminal is located in an area accessible to both the CDMA communication network and the LTE communication network.

Referring to FIG. 8, time information is received from a synchronous CDMA communication network and time synchronization is obtained as in step 801. On the other hand, since the dual mode terminal device can be connected to the LTE communication network, time information is also received from the LTE communication network.

In this case, an error between the time information received from the LTE communication network and the time information received from the CDMA communication network is calculated as in step 802 and the error average value is stored as shown in Equation 1 below.

&Quot; (1) "

CDMA_LTE_Diff = average (CDMA time - LTE Time)

Therefore, the dual mode terminal of the present invention can receive the SMS from the LTE communication network even when the dual mode terminal does not connect to the CDMA communication network as shown in FIG. 7, and transmits the received SMS to the LTE communication network based on the time information received from the LTE communication network and the error average value. Time stamps can be calculated and displayed on the received SMS. This can be expressed by the following equation (2).

&Quot; (2) "

Stamp Time = LTE Time + CDMA_LTE_Dif

9 is a diagram illustrating an SMS receiving method in a dual mode terminal according to another embodiment of the present invention. In particular, FIG. 9 assumes that the dual mode terminal is located in an area where connection with the LTE communication network is possible. Likewise, if the dual mode terminal is not connected to the CDMA communication network at the initial operation, the system time of the terminal device does not acquire time synchronization

Referring to FIG. 9, the SMS received from the LTE communication network may include information on the time when the sender transmits the SMS. In this case, the reception time stamp may be calculated by adding the transmission expected time to the transmission time.

Here, the estimated transmission time may be a value preset by the terminal manufacturer, or may be a value calculated statistically using base station information on which the transmitter is located and base station information on which the receiver is connected.

That is, the time stamp that is finally calculated and displayed can be expressed by Equation 3 below.

&Quot; (3) "

Stamp Time = SMS Sending Time + Transmission Duration Expectation Time

Meanwhile, the time stamp value calculated in Equations (2) and (3) may be calculated to be a time before the time stamp of the SMS received immediately before by the dual mode terminal. In such a case, the dual mode terminal may determine that it is a time stamp error, and may replace the time stamp of the immediately received SMS with the time stamp of the received SMS.

10 illustrates a block diagram of a terminal device according to an embodiment of the present invention.

10, a terminal apparatus 1000 includes a processor 1010, a memory 1020, an RF module 1030, a display module 1040, and a user interface module 1050. The terminal device 1000 is shown for the convenience of explanation, and some modules may be omitted. In addition, the terminal device 1000 may further include necessary modules. In addition, some modules in the terminal device 1000 can be divided into more detailed modules. The processor 1010 may separately include an LTE processor for communicating with the LTE network and a CDMA processor for communicating with the CDMA network and is configured to perform operations according to the embodiments of the present invention described above.

The memory 1020 is connected to the processor 1010 and stores an operating system, an application, a program code, data, and the like. The RF module 1030 is connected to the processor 1010 and performs a function of converting a baseband signal into a radio signal or a radio signal into a baseband signal. To this end, the RF module 1030 performs analog conversion, amplification, filtering, and frequency up conversion, or vice versa. Display module 1040 is coupled to processor 1010 and displays various information. The display module 1040 may use well known elements such as, but not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED), and an Organic Light Emitting Diode (OLED). The user interface module 1050 is connected to the processor 1010 and may be configured as a combination of well known user interfaces such as a keypad, a touch screen, and the like.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

In this document, the embodiments of the present invention have been mainly described with reference to the data transmission / reception relationship between the terminal and the base station. The specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal may be replaced by terms such as a UE (User Equipment), a Mobile Station (MS), and a Mobile Subscriber Station (MSS).

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (10)

A method for receiving a Short Message Service (SMS) in a wireless communication system, the method comprising:
Receiving first time information from a first communication network;
Receiving second time information from a second communication network;
Calculating and storing an error average of the first time information and the second time information; And
And setting the time information included in the SMS to the time information of the SMS received from the second communication network when the SMS message is received from the second communication network,
SMS receiving method. The method according to claim 1,
The first communication network is a Code Divisional Multiple Access (CDMA) communication network,
Wherein the second communication network is an LTE (Long Term Evolution) communication network.
SMS receiving method. 3. The method of claim 2,
Wherein when the SMS is received from the LTE communication network, it is impossible to transmit / receive a signal to / from the CDMA communication network.
SMS receiving method. 3. The method of claim 2,
If the time information of the SMS from the LTE communication network is earlier than the time information of the SMS previously received, setting the time information of the SMS from the LTE communication network as the time information of the immediately received SMS Lt; RTI ID = 0.0 >
SMS receiving method. delete delete A dual mode terminal in a wireless communication system,
A first wireless communication unit for transmitting and receiving signals from a CDMA (Code Division Multiple Access) communication network;
A second wireless communication unit for transmitting and receiving signals from an LTE (Long Term Evolution) communication network; And
And a processor for processing a signal received from the LTE communication network and a signal received from the CDMA communication network,
The processor comprising:
Calculating and storing an average of an error between the first time information received from the CDMA communication network and the second time information received from the LTE communication network and storing the time information included in the SMS when receiving the Short Message Service (SMS) And setting a value reflecting the error average as time information of the SMS received from the LTE communication network.
Dual mode terminal. 8. The method of claim 7,
Wherein when the SMS is received from the LTE communication network, it is impossible to transmit / receive a signal to / from the CDMA communication network.
Dual mode terminal. 8. The method of claim 7,
The processor comprising:
And sets the time information of the SMS received from the LTE communication network as the time information of the SMS received immediately before when the time information of the SMS from the LTE communication network is earlier than the time information of the previously received SMS. ,
Dual mode terminal. delete

Images