JP5674105B2 - Method and apparatus for supporting transmission of short message of idle mode terminal in wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a short message in a wireless communication system supporting an idle mode terminal.

  In a fourth-generation (4G) communication system, which is a next-generation communication system, research and commercialization for providing users with various services having a transmission rate of about 100 Mbps are being promoted. In particular, in the current 4G communication system, broadband wireless access (Broadband) such as a wireless short-range communication network (hereinafter referred to as LAN) system and a wireless metropolitan area network (hereinafter referred to as MAN) system. Research for supporting high-speed services in a form that guarantees mobility and QoS for a wireless communication (BWA) communication system has been actively conducted, and a representative communication system is an IEEE (Institut of Electrical and Electronics). (Engineers) 802.16 communication system.

  According to the IEEE 802.16 communication system standard, a terminal (Mobile Station) operates in an idle mode to minimize power consumption when there is no traffic to be transmitted and received during a certain period of time. The terminal is activated during a paging listening interval in the idle mode and receives a paging message. In the paging message, there is downlink data to be transmitted to the terminal in the idle mode, and an instruction to perform a network re-entry operation so as to transition from the idle mode to a connected state, or It includes information for instructing the terminal in the idle mode to perform location registration update (location update). The downlink data includes short message information to be transmitted to the idle mode terminal. When a short message to the terminal is waiting at the base station, the base station uses the paging message to indicate that the terminal Instruct to perform network re-entry operation.

  On the other hand, in the IEEE 802.16m communication system, when a short message must be transmitted to the idle mode terminal, the terminal may receive the short message without a transition procedure from the idle mode to the connected mode. Provide a way to do it. A procedure for supporting transmission of a short message to the idle mode terminal defined in the IEEE 802.16m communication system will be described with reference to FIG.

  FIG. 1 illustrates transmission of a short message from a base station to an idle mode terminal in a wireless communication system.

  As shown in FIG. 1, while the terminal 100 is performing an idle mode paging non-listening interval operation (step 101), a short message to the terminal 100 arrives at the base station 150 (step 103). In step 105, the paging listening section operation of the terminal 100 is performed, and in step 107, the base station 150 transmits a paging message including the information of the terminal 100. The paging message in step 107 includes information for instructing the terminal 100 to perform a location registration update procedure. The terminal 100 that has received the paging message including the location registration update procedure execution instruction information in the step 107 transmits a ranging code to the base station (step 109). The terminal 100 receives a response message for the ranging code transmitted from the base station 150 in the step 109 (step 111). The terminal 100 transmits a ranging request message including an indicator for notifying the base station 150 that the location update registration procedure is being performed (step 113). After receiving the ranging request message of step 113 from the terminal 100, the base station 150 transmits a ranging response message including the short message information (step 115).

  In the method of transmitting a short message to an idle mode terminal in IEEE 802.16m described with reference to FIG. 1, the ranging message used for the ranging procedure is utilized, but in the method of combining the ranging procedure and the short message. From the viewpoint of complicating the processing of the idle mode terminal, a need for a method for transmitting a short message to the idle mode terminal is emerging regardless of the ranging procedure.

Korean Published Patent No. 10-2006-0043533 Korean Published Patent No. 10-2010-0035578

  An object of the present invention is to provide a short message transmission processing method for a terminal in an idle mode.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a terminal operating method for supporting a short message service (SMS) in a wireless communication system, comprising an idle mode (Idle mode). Mode) receiving a short message from a base station via a ranging message, starting a timer when a short message is received from the base station, and while the timer is operating, A process of waiting for uplink resource allocation for transmitting an ACK (ACKnowledge) message to the base station, and when the uplink resource for transmitting the ACK message is allocated by the base station, Use the AC A message and a process of transmitting to the base station.

  In order to achieve the above object, according to a second aspect of the present invention, there is provided an operating method of a base station for supporting a short message service in a wireless communication system, wherein the short message is transmitted via the ranging message. To transmit a short message to the terminal, and to start a timer after transmitting the short message to the terminal, and to transmit an ACK message for the short message to the terminal while the timer is operating. And receiving an ACK message for the short message from the terminal.

  In order to achieve the above-mentioned object, according to a third aspect of the present invention, there is provided a terminal device for supporting a short message service in a wireless communication system, wherein a base station via a ranging message in an idle mode. A receiver for receiving a short message, and a timer when a short message is received from the base station, and for transmitting an ACK message for the short message to the base station while the timer is operating A control unit that waits for uplink resource allocation, and when the uplink resource for transmitting the ACK message is allocated by the base station, transmits the ACK message to the base station using the uplink resource. And a transmission unit.

  In order to achieve the above object, according to a fourth aspect of the present invention, there is provided a base station apparatus for supporting a short message service in a wireless communication system, wherein a short message is transmitted through the ranging message. A transmission unit for transmitting to the device, and after transmitting the short message to the terminal device, a timer is started and the terminal device transmits an ACK message for the short message to the base station while the timer is operating. And a receiving unit that receives an ACK message for the short message from the terminal device.

  In order to achieve the above object, according to a fifth aspect of the present invention, there is provided an operating method of a terminal for processing a short message service (SMS) in a wireless communication system, comprising: an idle mode; When a short message to be transmitted is generated, a process of receiving an uplink resource allocation necessary for transmitting the short message from a base station by driving a timer and using an uplink resource allocated by the base station And transmitting a short message to the base station and receiving an ACK message for the short message from the base station.

  In order to achieve the above object, according to a sixth aspect of the present invention, there is provided an operating method of a base station for processing a short message service in a wireless communication system, which is necessary for transmission of a short message. Allocating link resources, driving a timer, checking whether the short message is received from the terminal while driving the timer, and receiving the short message from the terminal, A step of canceling the timer and transmitting an ACK message for the short message to the terminal.

  The present invention provides a method for transmitting a short message to a terminal in an idle mode in a wireless communication system, and a method for transmitting a short message from an idle mode terminal. There is an advantage that data can be transmitted without unnecessary state transition.

It is a figure which shows transmission of the short message from the base station to an idle mode terminal in a radio | wireless communications system. 5 is a signal flowchart between a base station and a terminal when a short message is transmitted to an idle mode terminal in the wireless communication system according to the embodiment of the present invention. 5 is a signal flowchart between a base station and a terminal when an idle mode terminal transmits a short message in the wireless communication system according to the embodiment of the present invention. 5 is an operation flowchart of a terminal that receives a short message in an idle mode in a wireless communication system according to an embodiment of the present invention. 5 is an operation flowchart of a base station that transmits a short message to a terminal in an idle mode in the wireless communication system according to the embodiment of the present invention. 5 is an operation flowchart of a terminal that transmits a short message in an idle mode in the wireless communication system according to the embodiment of the present invention. 7 is an operation flowchart of a base station that receives a short message from an idle mode terminal in the wireless communication system according to the embodiment of the present invention. 1 is a device diagram for transmitting and receiving a short message from an idle mode terminal in a wireless communication system according to an embodiment of the present invention; FIG. 5 is an operation flowchart of a terminal that processes a reception response to a short message in the wireless communication system according to the embodiment of the present invention. 5 is an operation flowchart of a base station that processes a reception response to a short message in the wireless communication system according to the embodiment of the present invention. 4 is an operation flowchart of a terminal that processes a short message in the wireless communication system according to the embodiment of the present invention. 5 is an operation flowchart of a base station that processes a short message in the wireless communication system according to the embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a specific description of a related known function or configuration may obscure the gist of the present invention, detailed description thereof will be omitted. The terms described later are terms defined in consideration of the functions of the present invention, and this may vary depending on the user, the intention of the operator, the custom, or the like. Therefore, the definition must be made based on the contents throughout this specification.

  Hereinafter, the present invention describes a method and apparatus for supporting short message transmission to an idle mode terminal and transmission of a short message from an idle mode terminal in a wireless communication system (eg, IEEE 802.16m system).

  FIG. 2 shows a signal flow between a base station and a terminal when a short message is transmitted to an idle mode terminal in the wireless communication system according to the embodiment of the present invention.

  As shown in FIG. 2, the terminal 200 transits to the idle mode paging listening section in step 205 while performing the idle mode paging non-listening section operation in step 201. Meanwhile, the base station 250 recognizes the occurrence of a short message service (SMS) to be transmitted to the terminal 200 in the idle mode in step 203, and performs the paging listening section operation in step 207. A paging message including 200 information is transmitted. The paging message includes information instructing the terminal 200 to perform a location registration update procedure. Here, the instruction for performing the location registration update procedure corresponds to instruction information for performing a general location registration update procedure, but separately defines instruction information indicating that the location registration update procedure for receiving a short message can be performed. In such a case, such instruction information may be included in the paging message in step 207.

  The terminal 200 transmits a ranging code to the base station 250 in step 209, and receives a ranging code response message from the base station 250 in step 209. In step 213, the terminal 200 transmits a ranging request message including an indicator notifying the base station 250 that the location update registration procedure has been performed. On the other hand, if the terminal 200 already knows the short message transmission information through the paging message of the step 207, the location update registration procedure for the short message information is performed in the ranging request message transmitted in the step 213. Can be included.

  The indicator indicating that the location update registration procedure for short message information is performed, included in the ranging request message, may use one bit of a ranging purchase indicator that is a field of the ranging request message.

  When bit # 0 of “Ranging Purpose Indicator” is set to 1, the BSID is combined with the serving BSID to indicate that the terminal is currently attempting HO, and when bit # 1 is set to 1, Paging In combination with the Controller ID, the terminal indicates that it is attempting to re-enter the network from the idle mode. When bit # 2 is set to 1, it indicates that the terminal is currently attempting a handover prepared by the terminal. , Bit # 3 is set to 1, it indicates that the MS performs Idle Mode Location Update process. When Bit # 4 is set to 1, it represents the terminal operation of emergency call processing. Finally, when Bit # 5 is set to 1, it indicates that the idle mode location update process for the short message service is started.

  Thereafter, in step 215, the terminal 200 receives a ranging response message from the base station 250 as a response to the ranging request message. The ranging response message includes an indicator that informs the terminal 200 that it is a location update registration procedure for short message information. The indicator notifying that it is a location update registration procedure for the short message information notifies that there is a short message received by the terminal 200 in response to the terminal 200 performing the location registration update procedure.

  The indicator notifying that it is a location update registration procedure for the short message information included in the ranging response message can use one bit of Location update response which is a field of the ranging response message.

  The ranging response message includes a terminal identifier (STID) that is used by the terminal 200 to receive a short message.

  Thereafter, in step 217, the terminal 200 receives an L2 transmission message including the short message information from the base station 250. The L2 transmission message is encoded using the STID information received in the step 215, and the flow identifier corresponding to the primary connection (hereinafter referred to as FID (Flow IDentifier)) is included in the header of the L2 transmission message. ) Is included. The terminal 200 transmits an ACK message to the base station 250 after receiving the L2 transmission message including the short message information in step 219. Thereafter, the terminal 200 performs an idle mode operation in step 221. After receiving the ACK message from the terminal 200, the base station 250 releases the STID and primary connection assigned to the terminal 200, and manages the terminal 200 as an idle mode terminal.

  FIG. 3 is a signal flowchart between the base station and the terminal when the idle mode terminal transmits a short message in the wireless communication system according to the embodiment of the present invention.

  As shown in FIG. 3, during the idle mode operation in step 301, the terminal 300 recognizes that the short message to be transmitted to the uplink in step 303 is in the buffer. The terminal 300 transmits a ranging code for connection to the base station 350 in order to transmit the short message in step 305. Thereafter, the terminal 300 receives a ranging code response message for the ranging code transmitted from the base station 350 in step 307. In step 309, the terminal 300 transmits a ranging request message to the base station 350. The ranging request message includes an indicator for notifying that a location update procedure for transmitting a short message is performed, and the indicator included in the ranging request message may be expressed as shown in Table 1. The base station 350 that has received the ranging request message including an indicator for performing a location update procedure for transmitting the short message transmits a ranging response message to the terminal 300 in step 311. The ranging response message transmitted in the step 311 includes an indicator for notifying a location update procedure for transmitting a short message having a structure as shown in Table 2. The indicator notifying that the location update procedure is performed is a response to the indicator notifying that the location update procedure is to be performed, and the base station 350 informs the user that it is ready to receive the short message transmitted by the terminal.

  In addition, the terminal 300 transmits an STID (terminal identifier) used for transmitting the short message via the ranging response message. In step 313, the terminal 300 transmits an L2 transmission message including short message information to the base station 350. When transmitting the L2 transmission message, the terminal 300 uses the STID received in step 311 and the FID corresponding to the primary connection. Here, in order to transmit the L2 transmission message, the terminal 300 must allocate an uplink band from the base station 350. At this time, the terminal 300 uses the FID corresponding to the STID and the primary connection. . After receiving the L2 transmission message including the short message information from the terminal 300, the base station 350 transmits an ACK message to the terminal 300 in step 315. After receiving the ACK message, the terminal 300 proceeds to step 317 and continues to perform the idle mode operation. In step 317, the base station 350 continues to manage the terminal 300 as an idle mode terminal after releasing the FID corresponding to the STID and the primary connection allocated to transmit the short message of the terminal 300.

  FIG. 4 illustrates an operation of a terminal that receives a short message in the idle mode in the wireless communication system according to the embodiment of the present invention.

  As shown in FIG. 4, the terminal is in the idle mode paging non-listening period in step 401. In step 403, the terminal checks whether it is time to transition to the paging listening section. When the terminal transitions to the paging listening section, the terminal proceeds to step 405 and receives a paging message in the paging listening section. As a result of the determination in step 403, if it is not the time to transition to the paging listening section, the paging non-listening section in step 401 is maintained.

  Thereafter, in step 407, the terminal determines whether or not the corresponding information is included in the paging message. If the corresponding information is not included in the paging message, the terminal proceeds to step 401. If it is determined in step 407 that the terminal information is included in the paging message, the terminal proceeds to step 409 and determines whether the terminal information is a network re-entry instruction. When receiving the network re-entry instruction in step 409, the terminal performs a network re-entry procedure in step 411, and ends the idle mode in step 413. The network re-entry procedure performed in step 411 starts when the terminal performs a ranging procedure with the base station. However, since the network re-entry procedure is not directly related to the present invention, detailed description thereof is omitted.

  On the other hand, when it is not a network re-entry instruction, the terminal determines in step 415 whether or not the terminal information instructs to perform location registration update. When the terminal instructs to perform the location registration update procedure of the terminal in step 415, the terminal performs a code-based ranging procedure to the base station in step 417. The ranging procedure corresponds to Steps 209 to 211 in FIG. In step 419, the terminal transmits a ranging request message to the base station, and the ranging request message includes information indicating that the terminal performs a location registration update procedure. At this time, the information of Table 1 can be included. Thereafter, the terminal receives a ranging response message from the base station in step 421, and determines in step 423 whether short ranging message instruction information is included in the ranging response message. The short message instruction information in step 423 is a location registration update execution indicator for transmitting the short message, and corresponds to the information in Table 2.

  If the result of determination in step 423 includes an indicator that informs the terminal that a short message will be transmitted, the ranging response message in step 421 is necessary for the terminal to receive the short message. Contains STID information. Further, the terminal recognizes that a primary connection is set in order to receive the short message, and an FID corresponding to the primary connection can be used.

  In step 425, the terminal receives an L2 transmission message including the short message information. The L2 transmission message can be decoded using the FID corresponding to the STID and the primary connection. In step 427, the terminal transmits an ACK message to the base station, and proceeds to step 401 to continue the idle mode operation.

  If the result of determination in step 423 is that a short message information indicator is not included, the terminal proceeds to step 401 and continues to perform idle mode operation.

  If it is determined in step 415 that execution of the location registration update procedure of the terminal has not been instructed, another defined procedure is performed (eg, the process proceeds to step 401).

  FIG. 5 illustrates an operation of a base station that transmits a short message to a terminal in an idle mode in a wireless communication system according to an embodiment of the present invention.

  As shown in FIG. 5, the base station recognizes in step 501 that a short message to a terminal in the idle mode has arrived in the message buffer. In step 503, the base station waits until a time corresponding to the paging listening interval of the terminal. In step 505, the base station transmits a paging message instructing the terminal to perform a location registration update procedure during the paging listening period of the terminal.

  Thereafter, the base station waits until it receives the location registration update procedure message (ranging request message) of the terminal in step 507, and in step 509 receives information indicating the location registration update procedure from the terminal. It is determined whether a ranging request message is received. The ranging request message received from the terminal in step 509 may include the information of Table 1. In step 511, the base station transmits a ranging response message as a response to the ranging request message. The ranging response message includes an indicator (information in Table 2) for instructing the terminal to transmit a short message and the STID information of the terminal.

  Thereafter, in step 513, the base station transmits an L2 transmission message including the short message information to the terminal. The base station receives an ACK message from the terminal at step 515 and recognizes that the terminal has entered the idle mode at step 517.

  FIG. 6 illustrates an operation of a terminal that transmits a short message in an idle mode in a wireless communication system according to another embodiment of the present invention.

  As shown in FIG. 6, the terminal determines whether or not a short message has occurred in the buffer in step 603 while staying in the idle mode state in step 601 (that is, the user inputs a short message). If any). If it is determined in step 603 that there is a short message to be transmitted by the terminal, the process proceeds to step 605, where the terminal performs code-based ranging to perform a location registration update procedure for transmitting the short message. Do the procedure. Step 605 corresponds to step 305 to step 307 in FIG. In step 607, the terminal transmits a ranging request message including instruction information notifying that a location registration update procedure for transmitting a short message is performed. The instruction information for informing execution of the location registration update procedure for transmitting the short message corresponds to Table 1. In step 609, the terminal receives a ranging response message from the base station. The ranging response message includes instruction information for informing execution of a location registration update procedure for transmitting a short message corresponding to Table 2, and includes STID information used by the terminal for transmitting the short message. In step 611, the terminal transmits an L2 transmission message including short message information. At this time, the terminal uses the STID and the primary connection FID information included in the ranging response message in step 609 for an uplink bandwidth request / allocation procedure for transmitting the L2 transmission message. In step 613, the terminal receives an ACK message from the base station and proceeds to step 601 to continue the idle mode operation.

  FIG. 7 illustrates an operation of a base station that receives a short message from an idle mode terminal in a wireless communication system according to another embodiment of the present invention.

  As shown in FIG. 7, the base station receives a ranging request message instructing that it is performing a location registration update procedure for transmitting a short message in step 701. The ranging request message includes the information of Table 1. The base station recognizes that the terminal that transmitted the ranging request message in step 703 is a terminal in an idle mode, and in step 705, performs an instruction to perform a location registration update procedure for transmitting the short message to the terminal. Send a ranging response message with children. The indicator information corresponds to the information in Table 2. The base station transmits STID information used by the terminal for transmitting a short message to the ranging response message. In addition, the base station sets a primary connection in which the terminal transmits short message information. Thereafter, in step 707, the base station receives an L2 transmission message including short message information from the terminal. Before the step 707, the base station may perform an uplink bandwidth request / allocation procedure for an L2 transmission message transmitted by the terminal.

  Thereafter, the base station transmits an ACK message to the terminal in step 709, and recognizes that the terminal continues to operate in the idle mode again in step 711. In step 711, the base station releases the STID and primary connection assigned to the terminal in step 705.

  As described above, it is assumed that the uplink bandwidth request and allocation procedure for transmitting the L2 transmission message including the short message information between the terminal and the base station is performed in the procedures of FIG. 3, FIG. 6 and FIG. explained. Meanwhile, the base station knows in advance that the terminal transmits an L2 transmission message including short message information through a ranging request message transmitted by the terminal. At this time, the bandwidth allocation information for transmitting the L2 transmission message may be transmitted together through the ranging response message without the separate uplink bandwidth request and allocation procedure.

  On the other hand, when a short message and general downlink data to be transmitted to the idle mode terminal exist in the base station, the base station transmits a paging message instructing network re-entry in the paging listening period of the idle mode terminal. . Thereafter, when the network re-entry procedure with the terminal is completed, the base station transmits the short message and general downlink data to the terminal. On the contrary, if there is a short message and general uplink data transmitted by the idle mode terminal, the terminal performs a network re-entry procedure to the base station, and thereafter the short message and general uplink data. Send. The above-described operation is not different from a transition operation from a general idle mode to a connected state, and follows a network re-entry procedure performed at the time of state transition.

  FIG. 8 shows an apparatus for transmitting and receiving a short message from a terminal in an idle mode in a wireless communication system according to an embodiment of the present invention. The apparatus may be a base station or a terminal.

  As shown in FIG. 8, the apparatus includes an RF processor 801, an ADC 803, an OFDM demodulator 805, a decoder 807, a message processor 809, a controller 811, a message generator 817, an encoder 819, and OFDM modulation. 821, DAC (Digital to Analog Converter) 823, and RF processor 825. Here, the RF processor 801 and the RF processor 825 can operate in a TDD (Time Division Duplex) or FDD (Frequency Division Duplex) mode. For example, when operating in the TDD mode, the time controller 829 controls the switch 827 to operate the RF processor 801 during the reception period, and controls the switch 827 to control the switch 827 during the transmission period. Make it work.

  The RF processor 401 converts an RF (Radio Frequency) signal received via an antenna into a baseband analog signal. The ADC 803 converts the analog signal from the RF processor 801 into sample data and outputs it. The OFDM demodulator 805 converts the sample data output from the ADC 803 into frequency domain data by performing FFT (Fast Fourier Transform), and selects the subcarrier data to be actually received from the frequency domain data. Output. The decoder 807 demodulates and decodes the data from the OFDM demodulator 805 according to a predetermined modulation level (MCS level) and outputs the demodulated data. The message processing unit 809 divides the control message input from the decoder 807 and provides the result to the control unit 811. For example, a ranging request message, a ranging response message, a paging message, etc. are divided and the result is provided to the control unit 811.

  The control unit 811 performs a corresponding process on the information from the message processing unit 809, generates information to be transmitted, and provides the generated information to the message generation unit 817. The message generation unit 817 generates a message with various information provided from the control unit 811 and outputs the message to the physical layer encoder 819. For example, a ranging request message, a ranging response message, a paging message, and the like are generated and output to the physical layer encoder 819.

  The encoder 819 encodes and modulates data from the message generator 817 according to a predetermined modulation level (MCS level) and outputs the result. The OFDM modulator 821 performs IFFT (Inverse Fast Fourier Transform) on the data from the encoder 819 and outputs sample data (OFDM symbols). The DAC 823 converts the sample data into an analog signal and outputs the analog signal. The RF processor 825 converts the analog signal from the DAC 823 into an RF (Radio Frequency) signal and transmits it through an antenna.

  In the configuration described above, the control unit 811 is a protocol control unit, and controls the message processing unit 809 and the message generation unit 817. That is, the control unit 811 can perform the functions of the message processing unit 809 and the message generation unit 817. The reason why this is separately configured in the present invention is to distinguish and explain each function. Accordingly, when actually implemented, all of these can be processed by the control unit 811, and only some of them can be processed by the control unit 811. In addition, the controller 811 provides necessary information to the corresponding component in the physical layer during protocol processing, or generates a control signal in the corresponding component in the physical layer.

  The operation when the base station transmits a short message to the terminal will be described. The controller 811 of the terminal 200 transitions to the idle mode paging listening section while performing the idle mode paging non-listening section operation.

  The control unit 811 of the base station 250 recognizes the occurrence of a short message service (SMS) to be transmitted to the terminal 200 in the idle mode, and performs paging including information of the terminal 200 that performs a paging listening section operation. Send a message. The paging message includes information instructing the terminal 200 to perform a location registration update procedure.

  The control unit 811 of the terminal 200 transmits a ranging code to the base station 250 and receives a ranging code response message from the base station 250. The control unit 811 of the terminal 200 transmits a ranging request message including an indicator notifying the base station 250 that the location update registration procedure is performed. The indicator indicating that the location update registration procedure for the short message information included in the ranging request message is being performed may use one bit of the ranging purpose indicator that is a field of the ranging request message.

  The control unit 811 of the terminal 200 receives a ranging response message from the base station 250 as a response to the ranging request message. The ranging response message includes an indicator that informs the terminal 200 that it is a location update registration procedure for short message information. The indicator notifying that it is a location update registration procedure for the short message information notifies that there is a short message received by the terminal 200 in response to the terminal 200 performing the location registration update procedure.

  The control unit 811 of the terminal 200 receives an L2 transmission message including the short message information from the base station 250. The L2 transmission message is encoded using the STID information received in step 215, and the FID (Flow IDentifier) corresponding to the primary connection is included in the header of the L2 transmission message. The control unit 811 of the terminal 200 transmits an ACK message to the base station 250 after receiving the L2 transmission message including the short message information. The control unit 811 of the terminal 200 performs an idle mode operation after transmitting the ACK message. After receiving the ACK message from the terminal 200, the control unit 811 of the base station 250 releases the STID and primary connection assigned to the terminal 200, and manages the terminal 200 as an idle mode terminal.

  On the contrary, the operation when the terminal transmits a short message to the base station is described. During the idle mode operation, the control unit 811 of the terminal 300 recognizes that the short message to be transmitted to the uplink is in the buffer. In order to transmit the short message, a ranging code for connection to the base station 350 is transmitted. The control unit 811 of the terminal 300 receives a ranging code response message for the ranging code transmitted from the base station 350. The control unit 811 of the terminal 300 transmits a ranging request message to the base station 350. The ranging request message includes an indicator for notifying that a location update procedure for transmitting a short message is performed, and the indicator included in the ranging request message may be expressed as shown in Table 1.

  The controller 811 of the base station 350 transmits a ranging response message to the terminal 300. The ranging response message includes an indicator for notifying the location update procedure for transmitting a short message having a structure as shown in Table 2. The indicator notifying that the location update procedure is performed is a response to the indicator notifying that the location update procedure is to be performed, and the base station 350 informs the user that it is ready to receive the short message transmitted by the terminal.

  In addition, the control unit 811 of the terminal 300 transmits an STID (terminal identifier) used for transmitting the short message via the ranging response message. The control unit 811 of the terminal 300 transmits an L2 transmission message including short message information to the base station 350. When transmitting the L2 transmission message, the control unit 811 of the terminal 300 uses the received STID and the FID corresponding to the primary connection. Here, in order to transmit the L2 transmission message, the control unit 811 of the terminal 300 needs to be allocated an uplink band from the base station 350, and at this time, it corresponds to the STID and the primary connection. FID to be used. The control unit 811 of the base station 350 transmits an ACK message to the terminal 300 after receiving an L2 transmission message including the short message information from the terminal 300. The control unit 811 of the terminal 300 continues to perform the idle mode operation after receiving the ACK message.

  On the other hand, in the example of FIG. 2, when a short message is transmitted using an L2 transmission message, the short message is received, and an STID and an FID are assigned to the terminal to transmit an ACK for the received short message. Explained the case. The STID and the FID are assigned in a state where a connection between the base station and the terminal is established. In other words, in the example of FIG. 2, in order to use the L2 transmission message, a bandwidth request operation based on the terminal identifier (STID) is necessary.

  In other embodiments of FIGS. 9 to 12 below, the base station transmits the short message of the L2 layer without assigning STID and FID to the terminal in the idle mode. The short message may be included in the ranging response message. In such a case, there is a need for a method in which the terminal transmits a reception response to the short message included in the ranging response message. For this purpose, a reception response resource for a separate short message is used while the base station and the terminal are in a connectionless state. In other words, even if there is no resource request from the terminal, the base station allocates an upper link resource for transmitting the ACK message.

  FIG. 9 shows an operation flowchart of a terminal that processes a reception response to a short message in the wireless communication system according to the embodiment of the present invention.

  As shown in FIG. 9, when the terminal receives a ranging response message including a short message in step 901, the terminal starts timer X in step 903. The ranging response message including the short message in step 901 corresponds to the ranging response message in step 215. After the timer X is started, the terminal waits in step 905 for uplink resources to transmit an ACK message for the short message from the base station in an unconnected state with the base station.

  An identifier used for decoding the uplink resource that can determine whether uplink resources have been allocated to the terminal is included in the ranging response message of step 901. Alternatively, the identifier can be configured based on a terminal identifier used by the terminal in an idle mode, and can be used to distinguish the terminal in combination with information such as a paging cycle of the terminal. . As a result of the confirmation in step 905, when the uplink resource for transmitting the ACK message is allocated to the terminal, the terminal interrupts the timer X in step 909, and the base station in step 911 Send an ACK message. The ACK message may be the same as the ACK message of step 219. At this time, the FID included in the MAC header of the ACK message corresponds to the FID that is received from the base station through the ranging response message in step 901 or that is defined in advance as a short message reception response use. After transmitting the ACK message, the terminal proceeds to the idle mode of Step 913. If the timer X expires in step 907 without allocating uplink resources for transmitting the ACK message, the terminal proceeds to the idle mode in step 913. On the other hand, if the uplink resource for transmitting the ACK message has not been allocated and the timer X has not expired in step 907, the process proceeds to step 905 to wait for ACK message resource allocation.

  FIG. 10 shows an operation flowchart of the base station that processes the reception response to the short message in the wireless communication system according to the embodiment of the present invention.

  As shown in FIG. 10, the base station transmits a short message to the terminal through a ranging response message in step 1001. The ranging response message corresponds to the ranging message in step 215. At this time, the base station can provide an identifier necessary for decoding an uplink resource from which the terminal transmits an ACK message through the ranging response message. The base station allocates uplink resources necessary for the terminal to transmit an ACK message in step 1003, and starts a timer Y in step 1005. In step 1007, the base station confirms whether an ACK message is received from the terminal. When receiving the ACK message from the terminal, the base station interrupts the timer Y in step 1011 and processes the received ACK message in step 1013. Thereafter, the base station continues to manage the terminal in the idle mode in step 1015. Alternatively, as a result of the confirmation in step 1007, if an ACK message has not been received from the terminal, it is confirmed in step 1009 whether or not the timer Y has expired. If the timer Y expires without receiving an ACK message from the terminal, the base station proceeds to step 1015 and continues to manage the terminal in the idle mode, and the base station continues to manage the terminal in the next paging listening period. Attempt to send the short message in step 1001 again. On the other hand, if the ACK message has not been received from the terminal and the timer Y has not expired, the process proceeds to step 1007 to wait for the reception of the ACK message.

  On the other hand, in the embodiment of FIG. 3, the case where the idle mode terminal tries to transmit a short message has been described. In this case, STID and FID necessary for the short message transmission and ACK message reception are assigned. Here, a method in which the idle mode terminal transmits a short message and receives the ACK message without assigning the STID and the FID will be described.

  FIG. 11 shows an operation flowchart of a terminal that processes a short message in the wireless communication system according to the embodiment of the present invention.

  As shown in FIG. 11, when a short message to be transmitted is generated, the idle mode terminal performs a location update procedure for transmitting the short message as in FIG. 3 (step 1101). In step 1103, the terminal receives a ranging response message from the base station. The ranging response message in step 1103 corresponds to the ranging response message received in 311 of FIG. In step 1105, the terminal starts timer A and waits for the base station to allocate uplink resources necessary for transmission of a short message. In step 1107, the terminal checks whether uplink resources necessary for transmission of the short message are allocated. If the uplink resources are allocated, the terminal interrupts the timer A in step 1111. Here, the identifier used when decoding the uplink resource allocated to the terminal can be allocated by the base station through the ranging response message of step 1101. Or it corresponds to the identifier comprised from the information which can distinguish the said terminal like the paging period of the said terminal based on the idle mode identifier of the said terminal. In step 1113, the terminal transmits a short message using the allocated uplink resource. The short message transmitted in step 1113 corresponds to the L2 transmission message in step 313 or further corresponds to another L2 layer message (for example, a ranging request message). The FID included in the message header of the short message may be the FID assigned by the base station through the ranging response message in the step 1101 or a FID defined in advance for transmitting the short message. Thereafter, the terminal receives an ACK message for the short message from the base station in step 1115 and proceeds to step 1117 to continue the idle mode operation. On the other hand, if the uplink resource for transmitting the short message is not allocated until the timer A expires as a result of the determination in step 1109, the terminal proceeds to step 1101 and transmits the short message. Repeat the location update procedure. On the other hand, the terminal proceeds to step 1109 and when the timer A has not expired, the terminal proceeds to step 1107 and waits for allocation of uplink resources necessary for transmission of the short message.

  FIG. 12 shows an operation flowchart of the base station that processes the short message in the wireless communication system according to the embodiment of the present invention.

  As shown in FIG. 12, the base station transmits a ranging response message in step 1201 to a terminal that performs a location update procedure to transmit a short message. The ranging response message corresponds to the ranging response message in step 311. The base station allocates uplink resources necessary to transmit a short message to the terminal in step 1203 and starts timer B in step 1205. The uplink resource must be encoded into an identifier indicating the terminal to represent allocation to the terminal, and the identifier is allocated by the base station and transmitted via the ranging response message of step 1201 Alternatively, the paging cycle of the terminal may be combined based on the idle mode identifier of the terminal. The base station checks whether a short message is received from the terminal through the uplink resource allocated in step 1203 (step 1207). When the short message is received in step 1207, the base station interrupts the timer B in step 1211 and processes the short message in step 1213. The base station transmits an ACK message for the short message to the terminal in step 1215 and proceeds to step 1217 to continue managing the terminal in the idle mode. When the timer B expires in step 1209, the base station proceeds to step 1217. On the other hand, if the timer B has not expired in step 1209, the base station proceeds to step 1207 and waits for reception of the short message. As described above, the present invention provides a method for transmitting a short message to a terminal in an idle mode in a wireless communication system, and a method for transmitting a short message from an idle mode terminal, thereby connecting to the idle mode. There is an advantage that data can be transmitted without an unnecessary state transition with the mode.

  On the other hand, specific embodiments have been described in the detailed description of the present invention, but it goes without saying that various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention is not limited to the above-described embodiment, but must be determined not only by the claims but also by the equivalents of the claims.

100, 200, 300: terminal 150, 250, 350: base station 801: RF processor 803: ADC
805: OFDM demodulator 807: Decoder 809: Message processing unit 811: Control unit 813: Message generation unit 819: Encoder 821: OFDM modulator 823: DAC

Claims (15)

A method for operating a terminal for supporting a short message service (SMS) in a wireless communication system, comprising:
Receiving a short message from a base station via a ranging response message in idle mode;
A process of starting a timer when receiving a short message from the base station , wherein the ranging response message is transmitted from the base station using an identifier;
Waiting for uplink resource allocation to send an ACK (ACKnowledge) message for the short message while the timer is running;
Determining an uplink resource for transmitting the ACK message based on the identifier ;
And transmitting the ACK message using the uplink resource . A base station operating method for supporting a short message service in a wireless communication system, comprising:
Transmitting a short message via a ranging response message , wherein the ranging response message is transmitted from the base station using an identifier;
A process of starting a timer after sending the short message;
Allocating uplink resources for transmitting an ACK message for the short message based on the identifier while the timer is operating;
Receiving an ACK message for the short message. A terminal device for supporting a short message service in a wireless communication system,
A receiver for receiving a short message from a base station via a ranging response message in an idle mode , wherein the ranging response message is transmitted from the base station using an identifier;
When receiving a short message from the base station, start a timer,
While the timer is operating, the control unit waits for an uplink resource allocation for transmitting an ACK message for the short message, and determines an uplink resource for transmitting the ACK message based on the identifier. When,
A transmission unit that transmits the ACK message using the uplink resource . A base station apparatus for supporting a short message service in a wireless communication system,
A transmitting unit for transmitting a short message via a ranging response message , wherein the ranging response message is transmitted from a base station using an identifier;
After sending the short message, start a timer,
A controller that allocates uplink resources for transmitting an ACK message for the short message based on the identifier while the timer is operating;
A receiving unit configured to receive an ACK message for the short message. The process of receiving a short message from the base station via the ranging message in the idle mode includes:
Receiving a location registration update procedure request for receiving a short message via a paging message in a paging listening interval from the base station;
Transmitting a ranging code to the base station and receiving a response to the ranging code;
Transmitting a ranging request message to the base station;
The method according to claim 1, further comprising: receiving a ranging response message including the short message from the base station. The process of sending a short message via the ranging response message includes:
A process of transmitting a location registration update procedure request for receiving a short message via a paging message to a terminal during a paging listening period;
Receiving a ranging code from the terminal and transmitting a response to the ranging code;
The method of claim 2, further comprising: after receiving a ranging request message from the terminal, transmitting a ranging response message including the short message to the terminal. The method according to claim 5 or 6, wherein the ranging request message includes information indicating that it is a location update registration procedure for short message information. The method according to claim 5 or 6, wherein the ranging response message includes information indicating successful location update registration procedure for short message information. The method according to claim 1 or 2, wherein the uplink resource is a CDMA Allocation A-MAP IE. An identifier for decoding the uplink resource allocation is:
The method according to claim 1, wherein the method is configured based on a terminal identifier included in the ranging response message or used in the idle mode. The FID (Flow IDentifier) included in the MAC header of the ACK message is:
The method according to claim 1 or 2, wherein the FID is received from a base station via the ranging response message or is a FID predefined for the reception response of the short message. The method of claim 1, further comprising a transition to the idle mode when the timer expires. The receiving unit receives a location registration update procedure request for receiving a short message via a paging message in the paging listening period from the base station, transmits a ranging code to the base station, and responds to the ranging code And receiving a ranging response message including the short message from the base station,
The apparatus according to claim 3, wherein the transmission unit transmits a ranging request message to the base station. The transmitter is
A location registration update procedure request for receiving a short message via a paging message is transmitted to the terminal during the paging listening period, a response to the ranging code is transmitted, and a ranging response message including the short message is transmitted to the terminal. ,
The apparatus according to claim 4, wherein the receiving unit receives the ranging code from the terminal and receives a ranging request message from the terminal. The ranging response message is a response to the ranging request message sent from the terminal to the base station, and is an indicator for notifying that the location update registration procedure for short message information included in the ranging request message is being performed. Uses one bit of the ranging purchase indicator which is a field of the ranging request message.
The method according to claim 1 or 2, characterized in that

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