KR101207053B1 - Apparatus and method for providing system configuration change time in mobile communication - Google Patents

Abstract

The present invention relates to a method and apparatus for notifying change of system information in a mobile communication system, and more particularly, to an apparatus and method for transmitting and receiving a configuration change message using a quick paging message for minimizing terminal power consumption. In the mobile communication system, a method for informing a base station whether to change system setting information to an idle terminal includes checking whether it is time to send quick paging, calculating a time after a system setting is changed, and calculating And setting a configuration change indicator (CCI) corresponding to time to transmit a quick paging slot.

CDMA 2000 1x EV-DO, Paging, Idle state, slot, base station, terminal, system setting information

Description

A method and device for providing a system setting change point in a mobile communication system {APPARATUS AND METHOD FOR PROVIDING SYSTEM CONFIGURATION CHANGE TIME IN MOBILE COMMUNICATION}

1 is a conceptual diagram of a CDMA 2000 1x EV-DO mobile communication system;

2 is a view showing the structure of a quick paging slot according to an embodiment of the present invention,

3 is a flowchart of a base station configuring and transmitting a quick page slot including a configuration change indicator in a specific slot t according to an embodiment of the present invention;

4 is a flowchart illustrating an operation of a terminal receiving a quick page slot including a configuration change indicator in a specific slot t and updating system configuration information according to a value of the configuration change indicator included according to an embodiment of the present invention;

5 is a device block diagram of a terminal 500 and a base station 550 operating in accordance with the present invention.

The present invention relates to a method and apparatus for notifying change of system information in a mobile communication system, and more particularly, to an apparatus and method for transmitting and receiving a configuration change message using a quick page message that minimizes terminal power consumption.

In general, a wireless communication system is a system developed for a case in which a fixed wired network cannot be connected to a terminal and used. Representative systems of such a wireless communication system include a mobile communication system, a wireless LAN, Wibro, a mobile ad hoc, and the like.

Unlike general wireless communication, mobile communication assumes mobility of a user. The ultimate goal of mobile communication is to exchange information media at any time, anywhere, and anywhere using terminals such as mobile phones and pagers.

A representative method of such mobile communication is a cellular system. The cellular system divides a service area into a plurality of cells and installs one radio base station (cellular base station) in which a different frequency is assigned to an adjacent cell for each cell so that the same frequency can be reused. In this case, a service area by one wireless base station is called a cell, and thus, a unit service area is divided into cells and is called a cellular system.

Among the cellular systems, the first technology is an analog method such as Advance Mobile Phone System (AMPS) and Total Access Communication Services (TACS), which is called first generation mobile communication. The first generation of mobile communication systems has made it difficult to accommodate the rapidly increasing subscribers of mobile communication services, and the development of technology has increased the demand for various services as well as previous voice services. Due to these demands, digital second generation mobile communication has emerged more advanced than first generation mobile communication. Unlike the analog system, the second generation mobile communication system digitalizes an analog voice signal, performs a voice encoding, and uses a digital modulation and demodulation method, and uses a frequency of 800 MHz. The multiple access method uses a time division multiple access (TDMA) method and a code division multiple access (CDMA). In the second generation mobile communication system, voice services and low-speed data services are provided, and there are IS-95 (CDMA), IS-54 (TDMA), and GSM (Global System for Mobile communication) systems in the United States. In addition, PCS (Personal Communication Services) system is classified as a 2.5 generation mobile communication system, and uses a frequency of 1.8 ~ 2GHz band. These second generation mobile communication systems have been established for the purpose of increasing the efficiency of mobile communication systems while providing voice services to users. However, the emergence of the Internet and the demand for high-speed data services of users foreshadowed the emergence of a new wireless platform, which is a third generation mobile communication such as IMT-2000 (International Mobile Telecommunication-2000). The IMT-2000 is largely divided into a synchronous asynchronous method and a synchronous method, and a representative system of the asynchronous method is Universal Mobile Telecommunication Systems (UMTS) or Wideband CDMA (W-CDMA) of 3GPP (3rd Generation Partnership Project). The system includes CDMA 2000 1x of 3rd Generation Partnership Project 2 (3GPP2), CDMA 2000 1x Evolution Data Only (EV-DO), CDMA 2000 1x Evolution of Data and Voice (EV-DV), and the like.

A typical mobile communication system having a channel structure for such a high speed data transmission is a CDMA 2000 1x-EV-DO (1x EVolution Data Only) system. The 1xEVDO system is a mobile communication system of a standard proposed by 3GPP2 (3rd Generation Partnership Project 2) to supplement data communication of the IS-2000 system.

Looking at the configuration of the forward channel of the 1x-EVDO system, the time division multiplexing of the pilot channel, forward medium access control (MAC: MAC) channel, forward traffic channel and forward control channel (Time Division) Multiplexing). In this case, a bundle of time division multiplexed signals is referred to as a burst.

User data packets are transmitted in the forward traffic channel, and control messages and user data packets are transmitted in the forward control channel. The forward MAC channel is used to transmit reverse rate control and power control information or a designated channel for forward data transmission.

Unlike the forward channel, the reverse channel of the 1x-EVDO system has a channel having a different identification code for each terminal, and the reverse channel for each terminal includes a pilot channel, a reverse traffic channel, an access channel, and a data rate control. Control (hereinafter referred to as "DRC") channel and the Reverse Rate Indicator (RRI) channel. In the reverse traffic channel, a user data packet is transmitted, and a data rate control (DRC) channel is used to indicate a forward rate that the UE can support and a reverse rate indication (RRI). Indicator) channel is used to indicate the data rate of the data channel transmitted in the reverse direction. The access channel is used when the terminal transmits a message or traffic to the base station before the traffic channel is connected.

The structure and rate control operation of the 1x-EVDO system and its related channel will be described with reference to FIG. 1 as follows.

Referring to FIG. 1, a 1x-EVDO system is connected to the Internet network and transmits a packet data service node (hereinafter referred to as a PDSN) 40 to transmit high-speed packet data to a base station 20, and the base station. A base station controller (ANC) 30 for controlling 20 is configured. The base station 20 wirelessly communicates with a plurality of terminals 10 and transmits the high speed packet data to a specific terminal 10a.

In case of transmission rate control of the forward channel, the terminal 10 measures the reception strength of the pilot transmitted by the base station 20 to determine the forward data rate that the terminals 10 intend to receive based on the measured reception strength of the pilot. Decide The terminal 10 transmits DRC information corresponding to the determined forward data rate to the base station 20 through a data rate control channel. Then, the base station 20 may receive the DRC information transmitted by each terminal and transmit packet data at a transmission rate reported by the terminal to the terminals 10a having a good state among the various terminals.

Unlike the IS-95 system, the 1x-EVDO system is designed for instantaneous high speed data transmission so that the quick paging function is not used, but various services such as voice service (VoIP) or gaming (Gaming) are used over time. As a result, a quick paging function is needed to reduce power consumption of the terminal.

In the IS-95A system, the UE wakes up from an idle sleep state only when a paging message is transmitted from a base station and receives a paging message in a slotted mode for monitoring a paging channel. However, in the conventional method of receiving a slotted paging, the terminal has sufficient power consumption due to time for re-acquisition and time for receiving a message after idle sleep, thereby ensuring sufficient stand-by time. It was hard to do. Accordingly, in the IMT-2000, as described above, quick paging has been adopted to guarantee a longer waiting time than in the related art.

In the above-described quick paging method, a new channel, a forward quick paging channel, is created in addition to the current paging channel, and the base station receives a paging / control message through the new channel. Indicate whether there is slot or not. The information on the quick paging channel is transmitted in a 1-bit message without interleaving and encoding, and the terminal monitors the quick paging channel transmitted by the base station at a designated location. .

That is, the terminal determines whether or not to monitor the paging channel by receiving a 1-bit message of the quick paging channel without undergoing deinterleaving and decoding at the allocated time. The quick paging message is repeatedly transmitted at 40msec intervals twice in an 80msec slot for reliability. The transmission speed is transmitted at one of 9600bps and 4800bps.

The present invention provides an apparatus and method for notifying how much time has passed since a base station changes system information to an idle terminal in a mobile communication system.

The present invention provides an apparatus and method for transmitting information including the time since the system setting related information is changed in the quick paging channel in order to minimize the power consumption of the terminal.
In a mobile communication system according to the present invention, a method for providing a time point for changing system configuration information to a terminal in an idle state includes a quick paging slot in which a current slot should transmit a quick paging message. Checking whether it is a time point, if the current slot is the quick paging slot, calculating a time elapsed after a system setting is changed, and a configuration change indicator corresponding to the calculated time. CCI) to transmit a quick paging message including the configuration change indicator in the quick paging slot.
In the mobile communication system according to the present invention, a method for providing a change time of system setting information by a terminal in an idle state includes: checking whether a current slot is a quick paging slot to which a quick paging message is transmitted; If the current slot is the quick paging slot, receiving a forward channel to receive the quick paging message, and when or after the time indicated by the configuration change indicator (CCI) included in the quick page message Checking whether the system setting information has been updated at a point in time, and if the system setting information has not been updated at or after the point indicated by the setting change indicator, the control channel received from the base station. And updating the system setting information with system setting information.
In the mobile communication system according to the present invention, the base station apparatus for notifying whether the system setting information has been changed to the terminal in the idle state checks whether the current slot is a quick paging slot to which a quick paging message is transmitted. If the current slot is the quick paging slot, a quick paging message including the configuration change indicator is calculated by calculating a time elapsed after a system setting is changed and setting a configuration change indicator corresponding to the elapsed time. And a radio frequency unit for transmitting a control channel including the quick paging message and system setting information.
In the mobile communication system according to the present invention, an idle state terminal apparatus for checking whether system setting information has been changed is a radio frequency unit for receiving a quick paging message in a quick paging slot from a base station and receiving a control channel in a control channel slot. And, if the current slot is the quick paging slot, whether to wake up from the idle state and update the system configuration information at or after the time supported by the Configuration Change Indicator (CCI) included in the quick paging message; And a control unit for updating the system information with system information included in the control channel if the system setting information has not been updated.

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Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

As described above, unlike the IS-95 system, the 1x-EVDO system is designed for instantaneous high-speed data transmission so that the quick paging function is not used, but various services such as voice service (VoIP) or gaming (Gaming) are passed over time. As a result of this problem, a quick paging function for reducing power consumption of a terminal is required, and a quick paging slot for a time division multiple access structure of 1x-EVDO has been introduced.

The quick paging slot is a slot in front of a certain slot at the time of transmission of a control channel slot used to transmit paging and system overhead information about the terminal in the 1x-EVDO system. A slot is transmitted to (previous). Generally, one control channel slot is transmitted in one slot as compared to 8 slots and 16 slots. The quick paging slot serves to transmit a quick paging message, and the quick paging message includes a plurality of quick paging indicators each having a length of one bit.

The terminal receiving the quick paging slot receives one of a plurality of quick paging indicators included in the quick paging message according to a result of a function having its terminal identifier as an input value. At this time, if the bit has a value of '1', the terminal receiving the corresponding bit determines that the paging has been received, and receives the control channel slot transmitted following the quick paging slot to receive the actual paging message included therein. do. Since the quick paging slot is transmitted in only one slot, the terminal that receives it sleeps immediately without receiving a control channel slot transmitted in 8 slot or 16 slot length if its quick paging indicator bit is '0'. The mode can be switched to save power consumption.

Apart from this quick paging operation, the terminals of the 1x-EVDO system must update the system configuration information each time they wake up from the slotted mode operation to know that the system configuration information has changed. The system setting information is transmitted to the terminal through a system parameters message or an access parameters message as information including transmission characteristics of the system or an access method.

If the system configuration information is not updated with the latest contents, the terminal performs the reception of the paging message and the system access operation assuming that the base station has changed the system configuration information and other information. It can result in failure. For example, assume that the channel list transmitted by the base station included in the system parameter message is changed. The terminal performs an operation of receiving a paging message through one channel determined through a hash function or the like among these channel lists. However, when the base station changes this channel list and the terminal does not know this fact, the terminal misses paging because the base station cannot find the channel that actually transmits the paging.

According to an embodiment of the present invention, in configuring a quick paging slot or a quick paging message, the base station determines a time elapsed since the system configuration related information was last changed along with a paging indicator (or paging message) of the terminal in the quick paging slot or quick paging message. The present invention proposes a method of transmitting a configuration change indicator (or configuration change message) to a terminal.

In an embodiment of the present invention, in transmitting a quick paging slot, the base station may use specific bits of the quick paging message transmitted to the quick paging slot as a configuration change indicator indicating the time since the system configuration related information was last changed. .

According to an embodiment of the present invention, when the terminal receives the quick paging slot prior to the reception of a specific control channel slot, the terminal receives a configuration change indicator transmitted using specific bits of the quick paging message transmitted to the quick paging slot and relates to system configuration. Determine when the information last changed, and if no system configuration related information has been received, e.g., a system parameter message and an access parameter message at or after the time indicated by the configuration change indicator, Perform an update operation.

In the scheme proposed by the present invention, if the terminal receiving the quick paging slot has received system setting related information, for example, a system parameter message and an access parameter message, at or after the time indicated by the configuration change indicator, The receiving operation of the parameter message and the access parameter message can be omitted.

2 is a diagram illustrating a structure of a quick paging message 210 transmitted to a quick paging slot according to an exemplary embodiment of the present invention. As illustrated in FIG. 2, the quick paging message proposed by the present invention is a control channel packet (Control Channel header: CC header) 200 which is the same as a control channel packet in a special form of a control channel packet. And MAC layer header 204 structure. Since the control channel header 200 and the MAC layer header 202 are not related to the gist of the present invention, description thereof will be omitted. The security layer packet 204, which is transmitted after the two headers 200 and 202, consists of a plurality of bits, each bit serving as a quick paging indicator (or quick paging message). Following the Security Layer Packet 204, a Configuration Change Indicator (CCI) field 206, which indicates a configuration change indicator, is transmitted. The CCI field 206 has a plurality of bits and the combination of bits serves to indicate a specific point in time.

Table 1 below shows another structure of a quick paging message transmitted to a quick paging slot according to an embodiment of the present invention. The MessageID field of Table 1 below has a value of a message identifier indicating a quick paging message, and a ConfigurationChange field has a value of a configuration change indicator proposed by the present invention. The QuickPageIndicatorCount field is a field indicating the number of quick paging indicators transmitted and included in the quick paging message, and each bit of the QuickPageIndicator field included in the number of QuickPageIndicatorCount fields is a field indicating whether paging has been received for a specific terminal.

Field Length (bits) MessageID 8 ConfigurationChange 4 QuickPageIndicatorCount 8 QuickPageIndicatorCount occurrences of the following field: QuickPageIndicator One

Table 2 below is an example of when the CCI field 206 has 3 bits according to an embodiment of the present invention, the combination of each bit indicates the point in time at which the system configuration indicates a change. In the example of Table 2, CCI '000' means that the system setting information is changed in the control channel period (configured with 256 slots) in which the quick paging slot is transmitted. The value of CCI '001' means that the system setting information is changed 1 to 4 control channel cycles in the control channel cycle in which the quick paging slot is transmitted. As such, the value of each CCI may indicate different points in time at which the system setting information is changed. In <Table 2> below, "Time" means a period unit of a control channel.

CCI bits Time elapsed since the overhead information changed last time
(in units of control channel cycles) 000 0 <= Time <1 001 1 <= Time <5 010 5 <= Time <32 011 32 <= Time <181 100 181 <= Time <1024 101 1024 <= Time <5792 110 5792 <= Time <32768 111 32768 <= Time <INFINITE

Table 3 below is an example when the CCI field 206 has 4 bits according to another embodiment of the present invention, the combination of each bit indicates the point in time at which the system configuration indicates a change. In the example of <Table 3> below, CCI '0000' means that the system setting information is changed before one control channel period in the control channel period (256 slots) in which the quick paging slot is transmitted. The value of CCI '0001' means that system setting information has been changed before 2 control channel cycles in the control channel cycle in which the quick paging slot is transmitted. As such, the value of each CCI may indicate different points in time at which the system setting information is changed.

Value (4 bits) Control channel Cycles 0 ('0000') One 1 ('0001') 2 2 ('0010') 4 3 ('0011') 8 4 ('0100') 16 5 ('0101') 32 6 ('0110') 64 7 ('0111') 128 8 ('1000') 256 9 ('1001') 512 10 ('1010') 1024 11 ('1011') 2048 12 ('1100') 4096 13 ('1101') 8192 14 ('1110') 16384 15 ('1111') 32768

3 is a flowchart of configuring and transmitting a quick paging slot including a configuration change indicator in a specific slot t according to an embodiment of the present invention.

The base station checks whether the current slot t transmits a quick paging slot in step 300. This determination checks the terminal's quick paging slots (slots in which the terminal wakes up to receive the quick paging slots) and stores the terminal waking up to receive the quick paging channel in the current slot. This can be done by comprehensively determining the degree and the like. In step 300, the base station determining not to transmit the quick paging slot ends the quick paging related operation in the slot t.

On the other hand, the base station, which has decided to transmit the quick paging slot in step 300, determines how much time has passed since the system configuration information was last changed in step 302. Thereafter, the base station selects a configuration change indicator value corresponding to the time calculated in operation 302 in step 304 and configures a quick paging channel including the configuration change indicator. The base station transmits the quick paging channel configured in step 306 and terminates the operation in slot t.

The operation of setting the quick paging indicators constituting the quick paging slot is irrelevant to the present invention, and thus description thereof is omitted.

4 is a flowchart illustrating an operation of a terminal receiving a quick paging slot including a configuration change indicator in a specific slot t and updating system configuration information according to a value of the configuration change indicator included in the terminal according to an embodiment of the present invention.

In step 400, the terminal checks whether the terminal should wake up to receive the quick paging slot in the current slot t. (The terminal stores the number of specific slots waking up to receive the quick paging slot after negotiating with the base station.) The terminal determines that the terminal does not need to wake up to receive the quick paging slot. Terminate the quick paging related operation at t.

On the contrary, in step 402, the UE that needs to receive the quick paging slot wakes up from the slot t and receives the forward channel in step 402 to detect the quick paging slot. In step 404, the terminal checks whether a quick paging slot is detected. If the quick paging slot is detected, the terminal proceeds to step 406 and at or after the time indicated by the configuration change indicator included in the quick paging message transmitted to the quick paging slot. Check if the system configuration information has been updated.

If the system setting information has not been updated at or after the time specified by the setting change indicator in step 406, the system setting information is determined to be out of date and the system setting information is updated in step 408. . That is, when the UE first receives the quick paging channel in step 400, the UE switches from the sleep mode to the wake mode in step 402. If the UE does not receive the system setting information after the time point indicated by the CCI in step 406, the quick step in step 408. The system setting information is updated with system information included in the control channel received after the paging channel. On the other hand, when the quick paging slot is not detected in step 404 or when the system setting information is updated at or after the configuration change indicator is indicated in step 406, the terminal terminates the operation related to the configuration change indicator in slot t.

On the other hand, the operation of receiving the quick paging indicators constituting the quick paging slot is irrelevant to the present invention, so a description thereof is omitted.

5 is a device block diagram of a terminal 500 and a base station 550 operating in accordance with the present invention. The base station 550 apparatus for transmitting the configuration change indicator includes a scheduler and controller 550a, an RF unit 550b, and a data queue 550c. The apparatus 500 for transmitting the DRC information includes a transceiver 500a, a demodulator 500b, a decoder 500c, a controller 500d, and an encoder. (Encoder) 500e and modulator (Mod) 500f.

The data queue 550c of the apparatus of the base station 550 stores data or paging information received from an upper node in a queue for each terminal or service, and the scheduler and the controller 550a store the data or paging information stored for each queue. In consideration of DRC information (ie, forward channel conditions), service characteristics, fairness, etc. transmitted by UEs, data of a specific user or a specific queue is selectively controlled, and the radio frequency unit 550b receives the screened controlled data signal. The terminal 500 transmits to the device.

When the scheduler and the controller 550b select and transmit paging for a specific terminal, the scheduler and the controller 550b may configure and transmit a quick paging slot including the configuration change indicator proposed by the present invention. According to an embodiment of the present invention, the scheduler and the controller 550b check whether the current slot is a slot for transmitting a quick paging slot, calculate a time elapsed after the system setting is changed, and select a corresponding CCI to configure the quick paging slot. The mobile station transmits the data to the terminal device 500 through the radio frequency unit 550f.

The terminal device 500 demodulates the signal received by the transceiver 500a by the demodulator 500b, decodes the signal by the decoder 500c, and processes the determination by the controller 500d. The transceiver 500a and the controller 500d may determine whether system setting related information is changed by receiving a quick paging slot including a setting change indicator proposed by the present invention. That is, when the quick paging slot is received from the base station apparatus 500, the terminal device 550 checks whether the system configuration information has been updated at or after the time indicated by the CCI included in the quick paging slot. If the system setting information is not updated at or after the instruction, the system information is updated with the system setting information included in the control channel slot received from the base station apparatus 500.

When the data to be transmitted is generated, the terminal device 500 encodes the data in the encoder 500e and modulates the data in the modulator 500f to transmit the data to the base station 550 through the transceiver 500a. To send. The terminal 500 measures the strength of the pilot channel of the base station 550 received by the transceiver 500a in order to assist scheduling of the base station 550, and determines the DRC, that is, the data rate, that can be received from the base station. The transmission unit 500a transmits the data to the base station 550 again.

As described above, according to the present invention, when the system configuration information is changed, the terminal in the idle sleep state checks when the system configuration information is changed and updates the system configuration information, thereby reducing power consumption of the terminal.

Claims (12)

A method for providing a change point of system setting information to a terminal in an idle state in a mobile communication system, Checking whether the current slot is a Quick paging slot at which the Quick paging message should be sent; Calculating a time after a system setting is changed if the current slot is the quick paging slot; And setting a configuration change indicator (CCI) corresponding to the calculated time, and transmitting a quick paging message including the configuration change indicator in the quick paging slot. To provide when to change system settings on Windows. The method according to claim 1, The quick paging slot, A method for providing a system setting change point in a mobile communication system, characterized in that it is located at a previous point of a control channel slot. The method according to claim 1, The time passed after the system setting is changed, And providing a combination of a plurality of bits included in the configuration change indicator. In the method for providing a change time of the system setting information by the terminal in the idle state in the mobile communication system, Checking whether the current slot is a quick paging slot through which a quick paging message is sent; If the current slot is the quick paging slot, receiving a forward channel to receive the quick paging message, and when or after the time indicated by the configuration change indicator (CCI) included in the quick page message Checking whether the system setting information has been updated at the time; If the system setting information has not been updated at the time indicated by the setting change indicator or later, updating the system setting information with the system setting information included in the control channel received from the base station. Method of providing a system setting change point in a mobile communication system. 5. The method of claim 4, And providing a quick paging slot at a previous point of time of a control channel slot. 5. The method of claim 4, The time passed after the system setting is changed, And providing a combination of a plurality of bits included in the configuration change indicator. In the base station apparatus for notifying the terminal of the idle state whether to change the system setting information in the mobile communication system, Check whether the current slot is a quick paging slot through which a quick paging message is transmitted, and if the current slot is the quick paging slot, calculate a time elapsed after a system setting is changed and correspond to the elapsed time. A scheduler and a controller configured to configure a configuration change indicator to configure a quick paging message including the configuration change indicator; And a radio frequency unit for transmitting a control channel including the quick paging message and system setting information. 8. The method of claim 7, The quick paging slot, A base station apparatus in a mobile communication system, characterized in that located at a previous time point of the control channel slot. 8. The method of claim 7, The time passed after the system setting is changed, A base station apparatus in a mobile communication system, characterized in that represented by a combination of a plurality of bits included in the configuration change indicator. An idle terminal device for checking whether system setting information has been changed in a mobile communication system, A radio frequency unit for receiving a quick paging message in a quick paging slot from a base station and receiving a control channel in a control channel slot; If the current slot is the quick paging slot, it is checked whether the system configuration information has been updated at the time of supporting the configuration change indicator (CCI) included in the quick paging message or after waking from the idle state. And a controller which updates the system information with system information included in the control channel if the system setting information has not been updated. The method of claim 10, And the quick paging slot is located at a previous time point of the control channel slot. The method of claim 10, The time passed after the system setting is changed, Terminal device in a mobile communication system, characterized in that represented by a combination of a plurality of bits included in the configuration change indicator.

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