TWI511508B - Method and apparatus for transmitting paging message in wireless communication system - Google Patents

Description

Method and apparatus for transmitting paging messages in a wireless communication system [Cross-reference to related applications]

The present application claims US Provisional Patent Application No. 61/474,729, filed on Apr. 12, 2011, and U.S. Provisional Application No. 61/479,385, filed on April 26, 2011, and on February 10, 2012 The priority of the Korean Patent Application No. 10-2012-0013529, the entire disclosure of which is incorporated herein by reference.

This invention relates to wireless communications and, more particularly, to methods and apparatus for transmitting paging messages in a wireless communication system.

The Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard was adopted by the International Telecommunications Union Radiocommunication Sector (ITU-R) as International Mobile Telecommunications (IMT) in 2007 under the name "WMAN-OFDMA TDD". The sixth standard of 2000, the ITU-R is one of the departments of the International Telecommunication Union (ITU). The IMT advanced system has been developed by ITU-R as the next generation (ie, fourth generation) mobile communication standard after IMT-2000. The IEEE 802.16 Working Group (WG) decided to implement the 802.16m program to create the existing IEEE 802.16e revision standard as a standard for IMT advanced systems. As can be seen from the above, the 802.16m standard has two aspects, namely, the past (that is, the existing 802.16e standard). Continuity of continuity and continuity with the future (ie, the standard for the next generation of IMT advanced systems). Therefore, the 802.16m standard needs to meet all the requirements of the IMT Advanced System while maintaining compatibility with the 802.16e compliant mobile WiMAX system.

The Institute of Electrical and Electronics Engineers (IEEE) 802.16p standard, which is optimized for machine-to-machine (M2M) communication, is being developed based on the IEEE 802.16e standard and the IEEE 802.16m standard. M2M communication can be defined as the exchange of information performed in the core network, between the subscriber station and the server, or between the subscriber stations without any human interaction. In the IEEE 802.16p standard, media access control (MAC) enhancements to the IEEE 802.16 standard and minimum variations in orthogonal frequency division multiple access (OFDMA) physical layers (PHYs) in licensed bands are being discussed. Due to the discussion of the IEEE 802.16p standard, wide area wireless coverage is required in licensed bands and the scope of application automation M2M communication can be increased for observation and control purposes.

The requirements required for many M2M applications when accessing the network are significantly different from those required for human-initiated or human-controlled network access. M2M applications can include vehicle telematics services, health monitoring of biosensors, remote maintenance and remote control, smart metering, automated services for consumer devices, and more. M2M application requirements may include very low power consumption, a larger number of devices, short burst transmissions, device tampering detection and reporting, improved device authentication, and the like.

The paging message is a media access control (MAC) message, the media access The control message is received by the machine-to-machine (M2M) device operating in idle mode from the base station (BS) in each paging cycle. At the same time, most M2M applications have traffic characteristics in which relatively small messages are transmitted via the uplink (UL) at a fixed location. In addition, the UL message is mainly used for non-instant periodic reports. Therefore, there is a need for a method for efficiently performing non-instant periodic reporting of a BS by an M2M device.

The present invention provides a method and apparatus for transmitting paging messages in a wireless communication system. The present invention also provides a method of using a paging message to trigger uplink data transfer from a machine to machine (M2M) device.

In one aspect, a method of transmitting uplink (UL) data by a machine-to-machine (M2M) device in a wireless communication system is provided. The method includes the steps of: receiving a paging message from a base station, the paging message including an indicator for causing the M2M device to transmit the UL data; and, upon receiving the paging message, based on an indicator for causing the M2M device to transmit the UL data The UL data is transmitted to the base station.

The indicator for causing the M2M device to transmit UL data may be one bit.

If the value of the indicator for transmitting the UL data to the M2M device is 1, the UL data transmission of the M2M device may be indicated.

The paging message can be broadcast.

The M2M device can be fixed.

UL data can be non-instant UL data.

In another aspect, a method for transmitting uplink (UL) data by a machine-to-machine (M2M) device in a wireless communication system is provided. The method comprises the steps of: receiving a release login response message from a base station, the release login response message comprising a transmission type and a maximum number of paging cycles during idle mode entry; corresponding to up to (maximum number of paging cycles x paging cycle) Waiting to receive a paging message for causing the M2M device to transmit the UL data during the period of the length; and transmitting the UL data to the base station.

The transfer type can be one bit.

The value of the transfer type can be 1.

If the value of the transmission type is 1, the transmission type may indicate that the UL data transmission is allowed only after the M2M device receives the paging message for causing the M2M device to transmit the UL data.

If a paging message is received during a period corresponding to (the maximum number of paging cycles x paging cycle), the UL profile can be transmitted immediately after receiving the paging message.

If the paging message is not received during the period corresponding to (the maximum number of paging cycles x paging cycle), the UL profile can be transmitted after the period corresponding to (the maximum number of paging cycles x paging cycle) expires.

The paging message may include an indicator for causing the M2M device to transmit UL data, and the indicator has a value of one.

The paging message can be broadcast.

In another aspect, a machine pair in a wireless communication system is provided Machine (M2M) device. The M2M device includes a radio frequency (RF) unit for transmitting or receiving a radio signal and a processor coupled to the RF unit, wherein the processor is configured to: receive a paging message from the base station, the paging message including An indicator for causing the M2M device to transmit UL data; and upon receiving the paging message, transmitting the UL data to the base station based on an indicator for causing the M2M device to transmit the UL data.

The following techniques are applicable to, for example, code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access. (SC-FDMA) in various wireless communication systems. CDMA can be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented using a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate GSM Evolution (EDGE). OFDMA can be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, or Evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e, and IEEE 802.16m provides backward compatibility with IEEE 802.16e-based systems. UTRA is part of the Universal Mobile Telecommunications System (UMTS). Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of the Evolution UMTS (E-UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA), and the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) employs OFDMA in the downlink (DL) and SC-FDMA is employed in the uplink (UL). LTE-A (Advanced) is an evolution of 3GPP LTE.

The IEEE 802.16m is mainly described as an example to clarify the specification, but the technical spirit of the present invention is not limited to the IEEE 802.16m.

Figure 1 shows a wireless communication system.

Referring to FIG. 1, the wireless communication system 10 includes one or more base stations (BS) 11. BS 11 provides communication services to individual geographic regions (generally referred to as "communities") 15a, 15b, and 15c. Each of the cells is divided into a number of areas (referred to as "sectors"). User equipment (UE) 12 may be fixed or mobile, and UE 12 may be referred to as another term, such as a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station ( SS), wireless device, personal digital assistant (PDA), wireless data modem or handheld device. In general, BS 11 refers to a fixed station that communicates with UE 12, and BS 11 may be referred to as another term, such as an evolved NodeB (eNB), a base transceiver system (BTS), or an access point.

The UE generally belongs to one cell. The cell to which the UE belongs is referred to as a serving cell. A BS that provides communication services to a serving cell is called a servo BS. The wireless communication system is a cellular system, and thus the wireless communication system includes other cells adjacent to the serving cell. Other cells adjacent to the serving cell are referred to as neighboring cells. A BS that provides communication services to neighboring cells is referred to as a neighbor BS. The serving cell and the neighboring cell are relatively determined on the basis of the UE.

This technique can be used in the downlink (DL) or uplink (UL). In general, DL refers to communication from BS 11 to UE 12, and UL refers to communication from UE 12 to BS 11. In the DL, the transmitter can be part of the BS 11 and the receiver can be part of the UE 12. In the UL, the transmitter can be part of the UE 12 and the receiver can be part of the BS 11.

Figure 2 shows the basic M2M service system architecture of IEEE 802.16 supporting machine-to-machine (M2M) communication.

The basic M2M service system architecture 20 includes a mobile network operator (MNO) 21, an M2M service consumer 24, at least one IEEE 802.16 M2M device (hereinafter referred to as an 802.16 M2M device) 28, and at least one non-IEEE 802.16 M2M device 29. The MNO 21 includes an Access Service Network (ASN) and a Connectivity Service Network (CSN). The 802.16 M2M device 28 is an IEEE 802.16 mobile station (MS) with M2M functionality. The M2M server 23 is integral for communicating with one or more 802.16 M2M devices 28. The M2M server 23 has an interface that can be accessed by the M2M service consumer 24. The M2M service consumer 24 is a user of the M2M service. The M2M server 23 can be internal or external to the CSN, and the M2M server 23 can provide specific M2M services to one or more 802.16 M2M devices 28. The ASN may include an IEEE 802.16 base station (BS) 22. The M2M application operates based on the 802.16 M2M device 28 and the M2M server 23.

The basic M2M service system architecture 20 supports two types of M2M communication, that is, M2M communication between one or more 802.16 M2M devices and an M2M server, or point-to-multipoint communication between an 802.16 M2M device and an IEEE 802.16 BS. . The basic M2M service system architecture of Figure 2 allows 802.16 M2M devices to function as non-IEEE 802.16 M2M devices. Gather points to operate. Non-IEEE 802.16 M2M devices use a different radio interface than IEEE 802.16, such as IEEE 802.11, IEEE 802.15, PLC, or the like. In this case, the non-IEEE 802.16 M2M device is not allowed to change the radio interface to IEEE 802.16.

Figure 3 shows an advanced M2M service system architecture for IEEE 802.16 that supports machine-to-machine (M2M) communication.

In the advanced M2M service system architecture, 802.16 M2M devices can operate as a point of aggregation for non-IEEE 802.16 M2M devices, and 802.16 M2M devices can also operate as aggregation points for 802.16 M2M devices. In this case, in order to perform the aggregation function of the 802.16 M2M device and the non-802.16 M2M device, the radio interface can be changed to IEEE 802.16. In addition, the advanced M2M service system architecture supports peer-to-peer (P2P) connectivity between 802.16 M2M devices. In this case, the P2P connection can be established on IEEE 802.16 or another radio interface such as IEEE 802.11, IEEE 802.15, PLC or the like.

Hereinafter, an IEEE 802.16e and IEEE 802.16m frame structure will be described.

Figure 4 shows an example of an IEEE 802.16e frame structure.

The Time Division Duplex (TDD) frame structure of IEEE 802.16e is shown in FIG. The TDD frame includes a downlink (DL) transmission period and an uplink (UL) transmission period. The DL transfer cycle is temporarily preceded by the UL transfer cycle. The DL transmission cycle includes a preamble, a frame control header (FCH), a DL-MAP, a UL-MAP, and a DL burst area in order. The UL transmission cycle includes a ranging sub-channel and a UL burst area. Will be used to identify the UL transmission cycle and The guard time of the DL transmission period is inserted into the middle portion of the frame (between the DL transmission period and the UL transmission period) and the last portion (following the UL transmission period). The transmit/receive transition gap (TTG) is the gap between the DL burst and the subsequent UL burst. The receive/transmit transition gap (RTG) is the gap between the UL burst and the subsequent DL burst.

The preamble is used between the BS and the MS for the purpose of initial synchronization, cell search and frequency offset and channel estimation. The FCH includes information on the length of the DL-MAP message and the DL-MAP code writing scheme. The DL-MAP is an area for transmitting DL-MAP messages. The DL-MAP message defines access to the DL channel. This implies that the DL-MAP message defines DL channel indication and/or control information. The DL-MAP message includes a configuration change count of a downlink channel descriptor (DCD) and a BS identifier (ID). The DCD describes the DL burst configuration file applied to the current MAP. The DL burst configuration file indicates the characteristics of the DL physical channel. The DCD is periodically transmitted by the BS by using a DCD message. The UL-MAP is an area for transmitting UL-MAP messages. The UL-MAP message defines access to the UL channel. This implies that the UL-MAP message defines UL channel indication and/or control information. The UL-MAP message includes a configuration change count for the Uplink Channel Descriptor (UCD) and also includes the effective start time of the UL allocation defined by the UL-MAP. UCD describes the UL burst configuration file. The UL burst profile indicates the characteristics of the UL physical channel. The UCD is periodically transmitted by the BS by using the UCD message. The DL burst is an area for transmitting data transmitted by the BS to the MS. The UL burst is an area for transmitting data transmitted by the MS to the BS. The fast feedback area is included in the UL burst area of the frame. The fast feedback area is used to transmit information, which requires a quick response from the BS. The fast feedback area is available for CQI transmission. The position of the fast feedback area is determined by the UL-MAP. The location of the fast feedback area can be a fixed position in the frame or can be a variable position.

Figure 5 shows an example of an IEEE 802.16m frame structure.

Referring to FIG. 5, the hyperframe (SF) includes a hyperframe header (SFH) and four frames F0, F1, F2, and F3. Each frame may have the same length in the SF. Although it has been shown that each SF has a size of 20 milliseconds (ms) and each frame has a size of 5 ms, the present invention is not limited to this case. The length of the SF, the number of frames included in the SF, the number of SFs included in the frame, or the like may vary differently. The number of SFs included in the frame may vary differently depending on the channel bandwidth and the cycle first code (CP) length.

A frame includes 8 subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6, and SF7. Each subframe can be used for UL or DL transmission. A subframe includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols or orthogonal frequency division multiple access (OFDMA) symbols in the time domain, and one subframe includes a plurality of subcarriers in the frequency domain . The OFDM symbol is used to represent one symbol period, and the OFDM symbol may be referred to as other terms according to a multiple access scheme, such as an OFDMA symbol, an SC-FDMA symbol, or the like. The subframe can consist of 5, 6, 7, or 9 OFDMA symbols. However, this is for illustrative purposes only, and thus, the number of OFDMA symbols included in the subframe is not limited thereto. Included in the sub-frame The number of OFDMA symbols can vary differently depending on the channel bandwidth and the CP length. The subframe type can be defined according to the number of OFDMA symbols included in the subframe. For example, the subframe type can be defined such that the subframe of type 1 includes 6 OFDMA symbols, the subframe of type 2 includes 7 OFDMA symbols, and the subframe of type 3 includes 5 OFDMA symbols and the children of type 4 The frame includes 9 OFDMA symbols. A frame can include sub-frames each having the same type. Alternatively, a frame may include sub-frames each having a different type. That is, the number of OFDMA symbols included in each subframe may be the same or different in one frame. Alternatively, the number of OFDMA symbols included in at least one subframe of a frame may be different from the number of OFDMA symbols of the remaining subframes of the frame.

Time division duplex (TDD) or frequency division duplex (FDD) can be applied to the frame. In TDD, each subframe is used in UL or DL transmission at the same frequency and at different times. That is, the sub-frames included in the TDD frame are divided into UL sub-frames and DL sub-frames in the time domain. In FDD, each subframe is used for UL or DL transmission at the same time and at a different frequency. That is, the sub-frames included in the FDD frame are divided into UL sub-frames and DL sub-frames in the frequency domain. UL transmission and DL transmission occupy different frequency bands and can be performed simultaneously.

The Hyper Frame Header (SFH) carries basic system parameters and system configuration information. The SFH can be located in the first subframe of the superframe. The SFH can occupy the last 5 OFDMA symbols of the first subframe. SFH can be classified into primary SFH (P-SFH) and secondary SFH (S-SFH). Available at each P-SFH is transmitted in the superframe. The information transmitted on the S-SFH can be divided into three sub-packets, namely, S-SFH SP1, S-SFH SP2, and S-SFH SP3. Each sub-packet can be transmitted periodically and periodically. The information transmitted via S-SFH SP1, S-SFH SP2, and S-SFH SP3 may differ from each other. S-SFH SP1 can be transmitted in the shortest period, and S-SFH SP3 can be transmitted in the longest period. S-SFH SP1 includes information about network re-entry, and the transmission period of S-SFH SP1 can be 40 ms. The S-SFH SP2 includes information about initial network entry and network discovery, and the transmission period of the S-SFH SP2 can be 80 ms. S-SFH SP3 includes other important system information, and the transmission period of S-SFH SP3 can be 160 ms or 320 ms.

An OFDMA symbol includes a plurality of subcarriers, and the number of subcarriers is determined according to a fast Fourier transform (FFT) size. There are several types of subcarriers. The subcarrier types may include data subcarriers for data transmission, pilot subcarriers for various estimates, and null carriers for guard bands and DC carriers. The parameters used to characterize the OFDMA symbols include BW, N _used , n, G, and the like. BW represents the nominal channel bandwidth. N _used indicates the number of subcarriers (including DC subcarriers) in use. n represents the sampling factor. This parameter is _used to determine the subcarrier spacing and useful symbol time along with BW and N _used . G represents the ratio of CP time to useful time.

Table 1 below shows the OFDMA parameters. The OFDMA parameters of Table 1 are equally applicable to the 802.163 frame structure of FIG.

[Table 1]

In Table 1, N _FFT is the power of a minimum of 2 greater than N _used . The sampling factor F _s is the bottom limit (n.BW/8000)×8000, the subcarrier spacing Δf is F _s /N _FFT , the useful symbol time T _b is 1/Δ, and the CP time T _g is G. T _b , OFDMA symbol time T _s is T _b +T _g , and the sampling time is T _b /N _FFT .

In the following, a paging message will be described.

The paging message is machine-to-machine operated by the idle mode (M2M) A Media Access Control (MAC) message received by the device from the base station (BS) in each paging cycle. The paging message may indicate the presence of a downlink (DL) traffic to be transmitted to a particular mobile station (MS). Alternatively, the paging message may indicate the polling of the MS and the location update request in the absence of a request for network access. The paging message can be broadcast.

Table 2 shows an example of a BS broadcast paging message (i.e., MOB_PAG-ADV message), which is a paging message of IEEE 802.16e.

Referring to Table 2, when the value of the action code field of the MOB_PAG-ADV message is 0, the MOB_PAG-ADV message may indicate to the MS that there is a DL message to be transmitted. When the value of the action code field of the MOB_PAG-ADV message When 1, the MOB_PAG-ADV message can request the MS to perform a location update. In addition to the fields in Table 2, the MOB_PAG-ADV message may further include other fields.

Table 3 shows an example of a paging advertisement message (i.e., an AAI-PAG-ADV message), which is an IEEE 802.16m paging message.

Referring to Table 3, when the value of the action code field of the AAI-PAG-ADV message is 0, the AAI-PAG-ADV message can instruct the MS to perform network re-entry. When the value of the action code field of the AAI-PAG-ADV message is 1, the AAI-PAG-ADV message can instruct the MS to perform ranging for location update. In addition to the fields in Table 3, the AAI-PAG-ADV message may further include other fields.

The MS can transmit a deregistration request message to the BS. The MS may report the release request for the normal operation service provided from the BS to the BS via the release registration request message. The IEEE 802.16e release registration request message may be a DREG-REQ message. The IEEE 802.16m release registration request message may be an AAI-DREQ-REQ message.

In response to the release of the login request message, the BS may transmit the release registration response message to the MS. Alternatively, the release of the login response message can be transmitted separately without the request to cancel the login request. The release of the login response message may indicate a change in the access status of the MS. MS receives the unregistered response message Information, and take the action indicated in the action code. The IEEE 802.16e release login response message can be a DREG-CMD message. The IEEE 802.16m release login response message can be an AAI-DREQ-RSP message.

Table 4 shows an example of the message format of the DREG-CMD message of IEEE 802.16e.

Table 5 shows an example of DREG-CMD/REQ message coding of IEEE 802.16e. The TLV encoding parameter fields of Table 4 can be encoded as shown in Table 5.

Table 6 shows an example of the message format of the AAI-DREG-RSP message of IEEE 802.16m.

The paging message can be transmitted not only to the normal MS but also to the M2M device. That is, the MOV_PAG-ADV message of Table 2 can be transmitted to the M2M device operating in the IEEE 802.16e system, and the AAI-PAG-ADV message of Table 3 can be transmitted to the M2M device operating in the IEEE 802.16m system. At the same time, assume that most M2M devices are based on M2M The application transmits non-instantaneous periodic uplink (UL) data at a fixed location. Therefore, the paging message can be used to trigger non-instantaneous periodic UL data transmission of the fixed M2M device.

Hereinafter, the proposed UL data transmission method will be described. The present invention proposes a method of triggering UL data transmission by an M2M device by using a paging message.

According to the proposed UL data transmission method, the paging message may additionally include a field for triggering the UL data transmission of the M2M device. Regarding the M2M device operating in the IEEE 802.16e system, Table 7 shows an example of a MOB_PAG-ADV message including a field for triggering the UL data transfer of the M2M device.

Referring to Table 7, when the MOB-PAG-ADV message is used to poll the non-instantaneous periodic UL data transmission of the fixed M2M device, the M2M report code field can be newly added to the MOB_PAG-ADV message. If the value of the M2M report code field is 1, the BS can instruct the M2M device to transmit the UL data. In addition to the fields in Table 7, the MOB_PAG-ADV message may further include other fields.

Regarding the M2M device operating in the IEEE 802.16m system, Table 8 shows an example of an AAI-PAG-ADV including a field for triggering UL data transmission of the M2M device.

Although the MOB_PAG-ADV message or the AAI-PAG-ADV message has been described above for triggering UL data transmission, the present invention is not limited to this case. In addition, the field for triggering the UL data transfer of the M2M device can be newly added as described above, or the existing action code field can be used.

At the same time, the paging sequence of the existing paging message indicating the presence of the DL traffic to be transmitted to the MS may be equal to or different from the paging cycle of the paging message for triggering the UL data transmission of the M2M device proposed in the present invention. If the paging cycles of the two paging messages are different from each other, the M2M device needs to negotiate the paging cycle of each paging message when entering the idle mode. It is assumed hereinafter that the M2M device has a paging cycle that does not take into account the purpose of the paging message.

Figure 6 shows an embodiment of the proposed UL data transfer method.

In step S100, the BS transmits the paging message to the M2M device in the idle mode. In this case, the paging message triggers the UL data transmission of the M2M device. When the M2M device is operating in the IEEE 802.16e system For the M2M device, the paging message can be the MOB_PAG-ADV message of Table 7. When the M2M device is an M2M device operating in an IEEE 802.16m system, the paging message may be the AAI-PAG-ADV message of Table 8. That is, the field for triggering the UL data transmission of the M2M device can be added to the paging message.

In step S110, the M2M device performs ranging to the BS to transmit UL data. In step S120, the M2M device transmits the UL data to the BS.

Figure 7 shows an example of a paging listening window in accordance with the proposed UL data transmission method.

A smart meter for transmitting UL data every 24 hours is shown in FIG. The frame length is 20 milliseconds (ms) and the paging cycle is 512SF = 10.24 seconds. Therefore, the smart meter wakes up every 10.24 seconds to receive the AAI-PAG-ADV message transmitted from the BS. In addition, 8437 paging cycles = 4319744 hyperframes = 86394.88 seconds = about 24 hours. Therefore, the BS transmits an AAI-PAG-ADV message for triggering UL data transmission every 8437 paging cycles. As shown in Table 8, the M2M report code field in the AAI-PAG-ADV message can be one. Based on the AAI-PAG-ADV message transmitted in every 8437 paging cycles for triggering UL data transmission, the smart meter can periodically transmit UL data to the BS every 24 hours.

Figure 8 shows another embodiment of the proposed UL data transfer method.

Even if the BS transmits a paging message for triggering UL data transmission to the M2M device, there may be no data to be transmitted by the M2M device to the BS. In this case, the M2M device can not take action after receiving the message. Work. Therefore, the M2M device may not perform ranging for the BS, and may reduce unnecessary ranging attempts. However, when the M2M device does not transmit the UL data, the BS may not be able to discern whether the M2M device fails to receive the paging message without transmitting the UL data or because there is no UL data to be transmitted without transmitting the UL data. Therefore, the BS transmits the paging message for triggering the UL data transmission N times, and if there is no response from the M2M device to the situation, the M2M device can be instructed to perform the location update. This operation is to check the presence and location of the M2M device.

Referring to FIG. 8, in step S200, the BS transmits a paging message for triggering UL data transmission to the M2M device. In step S201, the M2M device performs ranging to the BS to transmit UL data. In the next paging cycle, that is, in step S210, the BS transmits a paging message for DL data transmission to the M2M device. In step S211, the M2M device performs ranging to the BS to receive the DL data.

In step S220, the BS transmits a paging message for triggering UL data transmission to the M2M device. However, since there is no UL material to be transmitted, the M2M device does not perform ranging for the BS. In the next paging cycle, that is, in step S230, the BS retransmits the paging message for triggering the UL data transmission to the M2M device. However, since there is no UL material to be transmitted, the M2M device does not perform ranging for the BS. If N = 2 is assumed, the BS transmits a paging message for location update to the M2M device (i.e., S240) in the next paging cycle. The action code of the paging message used for location update may be a location update. In step S241, the M2M device transmits a ranging request message for location update to the BS. (RNG-REQ message).

Figure 9 shows another embodiment of the proposed UL data transfer method.

Even if the BS transmits a paging message for triggering UL data transmission to the M2M device, if there is no UL data to be transmitted to the BS by the M2M device, the M2M device can report to the BS that there is no UL data by using the location update. In this case, the M2M device transmits the RNG-REQ message to the BS even if there is no UL data to be transmitted. The purpose of the RNG-REQ message can be location update. Even if there is no UL data to be transmitted, try unnecessary distance measurement. However, the BS can clearly recognize that there is no UL data to be transmitted, and the M2M device can report to the BS that there is no UL data without performing network entry.

Referring to FIG. 9, in step S250, the BS transmits a paging message for triggering UL data transmission to the M2M device. In step S251, the M2M device performs ranging on the BS to transmit the UL material. In the next paging cycle, that is, in step S260, the BS transmits a paging message for DL data transmission to the M2M device. In step S261, the M2M device performs ranging to the BS to receive the DL data.

In step S270, the BS transmits a paging message for triggering UL data transmission to the M2M device. However, since there is no UL data to be transmitted in step S271, the M2M device transmits an RNG-REQ message indicating that there is no UL material to be transmitted to the BS. The purpose of the RNG-REQ message can be location update. In step S272, in response to the RNG-REQ message, the BS transmits the RNG-RSP message to the M2M device.

At the same time, the access control for the M2M device can be achieved by using the present invention. Executed in the paging message used to trigger UL data transmission. Hereinafter, an access control method using a paging message will be described. The access control method proposed in the present invention can be classified into a method of controlling access of an M2M device by not transmitting a paging message, and a method of controlling access of an M2M device by using a paging message to report whether or not UL data can be transmitted. .

1) First, a method of controlling access of an M2M device by not transmitting a paging message will be described. In the following, when the paging message is said to have not been transmitted, this may imply that the paging message itself is not transmitted or may imply that the paging message is transmitted, but the identifier of the M2M device is not included in the paging message.

Figure 10 shows another embodiment of the proposed UL data transfer method.

Due to network overload, the BS may not transmit paging messages to the M2M device during a particular paging cycle. The M2M device expects to receive paging messages in each paging cycle. However, if the M2M fails to receive the paging message for triggering the UL data transmission, the M2M cannot transmit the UL data to the BS. Therefore, the BS can control access to a specific M2M device. At the same time, in this case, not all M2M devices fail to receive the paging message for triggering the UL data transmission, but the specific M2M device can receive the paging message, and another specific M2M device may not receive the paging message.

Referring to FIG. 10, in step S300, the BS transmits a paging message for triggering UL data transmission to the M2M device. In step S301, the M2M device performs ranging on the BS to transmit UL data. In the next paging cycle That is, in step S310, the BS transmits a paging message for DL data transmission to the M2M device. In step S311, the M2M device performs ranging to the BS to receive the DL data.

In step S320, a traffic overload occurs. Therefore, the BS does not transmit a paging message for triggering UL data transmission to the M2M device. Since the M2M device fails to receive the paging message, the ranging for UL data transmission is not performed. Therefore, access control for the M2M device is achieved.

Figure 11 shows another embodiment of the proposed UL data transfer method.

Due to network overload, the BS may not transmit a paging message for triggering UL data transmission to the M2M device during a specific paging cycle. In this case, the M2M device may expect to receive a paging message for triggering UL data transmission in the next paging cycle and may postpone the transmission of the UL data. However, if the BS continues to transmit the paging message for triggering the UL data transmission, the UL data to be transmitted by the M2M device expires, and the ranging for transmitting the UL data cannot be performed. Therefore, in the case where the M2M device cannot receive the paging message from the BS and thus cannot satisfy the quality of service (QoS), the M2M device can attempt to measure the BS to transmit the UL data. When the M2M device fails to receive the paging message during up to N paging cycles, the M2M device may attempt to measure the BS. For example, N can be 3.

When the M2M device transmits the RNG-REQ message to the BS, the purpose of reporting the ranging is to expire the maximum number of transmissions of the paging message. The BS can recognize this and can allow the network of the M2M device to enter the process. The maximum number of transmissions of paging messages can be equally applied to all M2M devices. In this case, the maximum number of transmissions of the paging message can be defined by system parameters. Alternatively, the maximum number of transmissions of the paging message may be different for each M2M device depending on the type of service. In this case, the maximum number of transmissions of the paging message may be negotiated as one of the capability values or may be defined during the DSx process.

In this case, the M2M device can be configured such that the UL material is transmitted only after receiving a message from the BS for triggering the UL data transmission. The BS can control the overall network load by controlling the presence/absence of UL data transmission according to the load. In addition, in this case, the UL data of the M2M device generally has a delay tolerance characteristic, and thus the UL data transmission of the M2M device has no major problem. The M2M device can negotiate this characteristic of the M2M device with the BS during the login process or when entering the idle mode. Alternatively, the M2M device may negotiate the characteristics of the M2M device with the BS in each of the service flows via the DSx process.

Referring to FIG. 11, in step S400, the BS transmits a paging message for triggering UL data transmission to the M2M device. In step S401, the M2M device performs ranging to the BS to transmit UL data.

In step S410, a traffic overload occurs. Therefore, the BS does not transmit a paging message for triggering UL data transmission to the M2M device. Since the M2M device fails to receive the paging message, the ranging for UL data transmission is not performed. The BS does not transmit the paging message to the M2M device during the N paging cycles, and thus the M2M device cannot receive the paging message during the N paging cycles.

When the M2M fails to receive the paging message during the N paging cycles corresponding to the maximum number of transmissions of the paging message, the M2M device is in step In S420, code ranging is attempted. In step S421, the M2M device transmits the RNG-REQ message to the BS. In this case, the RNG-REQ message may indicate the expiration of the maximum number of transmissions of the paging message. In step S422, in response to the RNG-REQ message, the BS may transmit the RNG-RSP message to the M2M device. Therefore, the M2M device can continue to perform the network entry process on the BS.

The maximum number of transmissions of the paging message may be included in the unregistration response message. For example, the maximum number of transmissions of the paging message may be included in the DREG-CMD message, which is the IEEE 802.16e release registration response message. Alternatively, the maximum number of transmissions of the paging message may be included in the AAI-DREG-RSP message, which is an IEEE 802.16m deregistration response message. Table 9 shows an example of a DREG-CMD message including a field for indicating the maximum number of transmissions of a paging message.

Referring to Table 9, when the BS controls the access of the M2M device by using the paging message, the Transmission Type field and the maximum number of paging periods can be newly added to the DREG-CMD message. The M2M device can receive the DREG-CMD message, which includes the maximum number of paging periods and the transmission type field (in the transmission type field, the M2M device is set to 1). In this case, the M2M device may wait for the MOB_PAG-ADV message (ie, the paging message with the M2M report code) during the period corresponding to (the maximum number of paging cycles x paging cycle) before transmitting the UL data, the MOB_PAG- The ADV message is used to trigger UL data transfer. If the M2M device fails to receive the MOB_PAG-ADV message for triggering at least one UL data transmission during the period corresponding to (the maximum number of paging cycles × paging cycle), the M2M device may transmit the UL data to the BS without receiving the MOB_PAG. -ADV message.

Table 10 shows an example of an AAI-DREG-RSP message including a field indicating the maximum number of transmissions of the paging message.

Referring to Table 10, when the BS controls the access of the M2M device by using the paging message, the transmission type field and the maximum number of paging periods can be newly added to the AAI-DREG-RSP message. The transmission period of the UL data is equal to or greater than the paging cycle. The M2M device can receive an AAI-DREG-RSP message including a maximum number of paging periods and a transmission type field set to one. In this case, the M2M device can correspond to (the maximum number of paging cycles before transmitting the UL data) The AAI-PAG-ADV message (i.e., the paging message with the M2M report code = 0b1) is waited for during the period of the video paging cycle, and the AAI-PAG-ADV message is used to trigger the UL data transmission. If the M2M device fails to receive the AAI-PAG-ADV message for triggering at least one UL data transmission during the period corresponding to (the maximum number of paging cycles x paging cycle), the M2M device may transmit the UL data to the BS without Receive AAI-PAG-ADV messages.

Figure 12 shows another embodiment of the proposed UL data transfer method.

In step S500, the BS transmits an AAI-DREG-RSP message to the M2M device, the AAI-DREG-RSP message being set to the transmission type=1. In step S510, the BS transmits an AAI-PAG-ADV message to the M2M device, and the AAI-PAG-ADV message is set to the M2M report code = 0b1. Therefore, the MS can transmit the UL data to the BS. In step S520, the M2M device transmits the AAI-DREG-REQ message to the BS. In step S521, the BS transmits an AAI-DREG-RSP message to the M2M device, and the AAI-DREG-RSP message is set to the transmission type=1.

In step S530, an access overload occurs. Therefore, the BS does not transmit an AAI-PAG-ADV message to the M2M device, and the AAI-PAG-ADV message is set to the M2M report code = 0b1. The M2M device may wait for an AAI-PAG-ADV message during a period corresponding to (the maximum number of paging cycles x paging cycles), the AAI-PAG-ADV message being set to M2M reporting code = 0b1. If the M2M device fails to receive the AAI-PAG-ADV message during the period corresponding to (the maximum number of paging cycles x paging cycle), the AAI-PAG-ADV message is set to If the M2M report code = 0b1, the M2M device can attempt to perform ranging for UL data transmission.

2) A method of controlling the access of the M2M device by reporting whether the M2M device can transmit the UL data via the paging message will be described.

Figure 13 shows another embodiment of the proposed UL data transfer method.

The BS may allow the paging message to include a UL barring indicator. Upon receiving the paging message including the UL Prohibition Indicator, the M2M device may wait for a predefined interval and then may receive a paging message for triggering the UL data transmission, and may transmit the UL material.

Referring to FIG. 13, in step S600, the BS transmits a paging message for triggering UL data transmission to the M2M device. In step S601, the M2M device performs ranging on the BS to transmit UL data. In the next paging cycle, that is, in step S610, the BS transmits a paging message for DL data transmission to the M2M device. In step S611, the M2M device performs ranging to the BS to receive the DL data.

In step S620, a traffic overload occurs. The BS transmits a paging message including a UL prohibition indicator to the M2M device. When a paging message is received, the M2M device may defer UL data transmission during a predefined interval. The predefined interval can be a paging loop. In step S630, the BS transmits a paging message for triggering UL data transmission to the M2M device. In step S640, the M2M device attempts to measure the BS to transmit the UL data.

Figure 14 shows another embodiment of the proposed UL data transfer method.

The BS may allow the paging message to include the UL Prohibited Time. When received When the UL prohibits the paging message of the time, the M2M device can wait for the UL prohibition time and then can transmit the UL data.

Referring to FIG. 14, in step S650, the BS transmits a paging message for triggering UL data transmission to the M2M device. In step S651, the M2M device performs ranging to the BS to transmit UL data. In the next paging cycle, that is, in step S660, the BS transmits a paging message for DL data transmission to the M2M device. In step S661, the M2M device performs ranging to the BS to receive the DL data.

In step S670, a traffic overload occurs. The BS transmits a paging message including the UL prohibition time to the M2M device. When a paging message is received, the M2M device may defer UL data transmission during the UL barring time. In step S680, the M2M device attempts to measure the BS to transmit the UL data.

Figure 15 is a block diagram showing a wireless communication system for implementing an embodiment of the present invention.

The BS 800 can include a processor 810, a memory 820, and a radio frequency (RF) unit 830. Processor 810 can be configured to implement the proposed functions, procedures, and/or methods described in this specification. The layers of the radio interface protocol can be implemented in the processor 810. The memory 820 is operatively coupled to the processor 810, and the memory 820 stores various information for operating the processor 810. The RF unit 830 is operatively coupled to the processor 810 and the RF unit 830 transmits and/or receives radio signals.

The M2M device 900 can include a processor 910, a memory 920, and an RF unit 930. Processor 910 can be configured to implement the proposed functions, procedures, and/or methods described in this specification. Can be implemented in the processor 910 Apply layers of the radio interface agreement. The memory 920 is operatively coupled to the processor 910, and the memory 920 stores various information for operating the processor 910. The RF unit 930 is operatively coupled to the processor 910, and the RF unit 930 transmits and/or receives radio signals.

Processors 810 and 910 can include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and/or data processing devices. The memory 820, 920 can include read only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The RF units 830, 930 can include a baseband circuit to process the radio frequency signals. When embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., programs, functions, etc.) that perform the functions described herein. The modules can be stored in memory 820, 920 and executed by processors 810, 910. The memory 820, 920 can be implemented within the processor 810, 910 or external to the processor 810, 910, in which case their memory 820, 920 can be coupled in a communication manner via various means as is known in the art. Connected to the processors 810, 910.

Machine-to-machine (M2M) devices efficiently transmit uplink data.

10‧‧‧Wireless communication system

11‧‧‧Base station/BS

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20‧‧‧Basic M2M Service System Architecture

21‧‧‧Mobile Internet Operator/MNO

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23‧‧‧M2M server

24‧‧‧M2M service consumers

28‧‧‧IEEE 802.16 M2M device/802.16 M2M device

29‧‧‧Non-IEEE 802.16 M2M devices

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21‧‧‧Mobile Internet Operator/MNO

22‧‧‧Base station/BS

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800‧‧‧BS

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900‧‧‧M2M device

910‧‧‧ processor

920‧‧‧ memory

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Figure 1 shows a wireless communication system.

Figure 2 shows the basic M2M service system architecture of IEEE 802.16 supporting machine-to-machine (M2M) communication.

Figure 3 shows IEEE 802.16 supporting machine-to-machine (M2M) communication. Advanced M2M service system architecture.

Figure 4 shows an example of an IEEE 802.16e frame structure.

Figure 5 shows an example of an IEEE 802.16m frame structure.

Figure 6 shows an embodiment of the proposed UL data transfer method.

Figure 7 shows an example of a paging listening window in accordance with the proposed UL data transmission method.

Figure 8 shows another embodiment of the proposed UL data transfer method.

Figure 9 shows another embodiment of the proposed UL data transfer method.

Figure 10 shows another embodiment of the proposed UL data transfer method.

Figure 11 shows another embodiment of the proposed UL data transfer method.

Figure 12 shows another embodiment of the proposed UL data transfer method.

Figure 13 shows another embodiment of the proposed UL data transfer method.

Figure 14 shows another embodiment of the proposed UL data transfer method.

Figure 15 is a block diagram showing a wireless communication system for implementing an embodiment of the present invention.

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Claims (9)

A method for transmitting uplink (UL) data by a machine to machine (M2M) device in a wireless communication system, the method comprising the steps of: receiving a deregistration response message from a base station, the deregistration The response message includes a transmission type and a maximum number of paging cycles during an idle mode entry period; waiting for receiving one for triggering during one of the periods corresponding to up to (the maximum number of paging cycles x one of the paging cycles) The M2M device transmits a paging message of the UL data; and transmits the UL data to the base station. The method of claim 1, wherein the transfer type is one bit. The method of claim 2, wherein one of the transfer types has a value of one. The method of claim 3, wherein if the value of the transmission type is 1, the transmission type indicates that the UL is allowed only after the M2M device receives the paging message for causing the M2M device to transmit the UL data. Data transfer. The method of claim 1, wherein if the paging message is received during a period corresponding to (the maximum number of paging cycles x paging cycles), the UL data is transmitted immediately after receiving the paging message. The method of claim 1, wherein if the paging message is not received during the period corresponding to (the maximum number of paging cycles x paging cycle), then corresponds to (the maximum number of paging cycles x paging cycle) ) The UL data is transmitted after the expiration of the period. The method of claim 1, wherein the paging message includes an indicator for causing the M2M device to transmit the UL data, and one of the indicators has a value of one. The method of claim 1, wherein the paging message is broadcast. A machine-to-machine (M2M) device, comprising: a memory; a radio frequency (RF) unit; and a processor coupled to the memory and the RF unit, and the processor is configured to Controlling the RF unit to receive a de-registration response message from a base station, the de-registration response message including a transmission type and a maximum number of paging cycles during an idle mode entry; corresponding to as many as (paging loop) One of the maximum number x length of the paging cycle) waiting to receive a paging message for triggering the M2M device to transmit uplink (UL) data; and controlling the RF unit to transmit the UL data to the base station .