KR100547881B1 - Mode transition method of mobile station for wireless data service - Google Patents

Abstract

The present invention relates to a method for transitioning a state of a mobile terminal for a data service in a mobile communication system supporting voice and data services. The mobile terminal in the control-hold state detects at least one predetermined indication bit by wake-up in an allocated timeslot on the forward wake-up channel received from the base station, and transmits the at least one indication bit by the base station. Upon indicating that there is data, it begins monitoring the forward packet data control channel from the base station to determine whether to transition to the active mode. On the other hand, if the at least one indication bit does not indicate that there is data to be transmitted from the base station, the control hold state is maintained to prevent waste of power. As a result, the present invention can save the radio resources of the base station and minimize the power consumption of the mobile terminal.

1XEV-DV, Activation Mode, Control Hold Mode, State Transition, MAC Protocol, F-WUCH

Description

MODE TRANSITION METHOD OF MOBILE STATION FOR WIRELESS DATA SERVICE}

1 is a view showing an example of a state transition operation of a mobile terminal according to the prior art.

2 is a view showing another example of a state transition operation of a mobile terminal according to the prior art.

3 is a flowchart illustrating an operation of a mobile terminal for transitioning from a control hold mode to an active mode according to FIG. 2.

4 is a flowchart illustrating an operation of a base station for transitioning from a control hold mode to an active mode according to FIG. 2.

5 is a message flow diagram illustrating a state transition operation of a mobile terminal according to the present invention.

6 is a diagram illustrating channels for state transition operation of a base station and a mobile terminal according to the present invention.

7 is a diagram illustrating a structure of an F-WUCH for transmitting one indication bit according to the first embodiment of the present invention.

8 is a flowchart illustrating the operation of a mobile terminal using one indication bit according to the first embodiment of the present invention.

9 is a flowchart illustrating operation of a base station using one indication bit according to the first embodiment of the present invention.

10 is a diagram illustrating operations of a mobile terminal and a base station according to the first embodiment of the present invention during continuous packet transmission.

FIG. 11 illustrates a structure of an F-WUCH for transmitting two indication bits according to a second embodiment of the present invention. FIG.

12 is a diagram illustrating a state transition of a mobile terminal using two indication bits according to a second embodiment of the present invention.

13 is a flow diagram illustrating operation of a mobile terminal using two indication bits in accordance with a second embodiment of the present invention.

14 is a flowchart illustrating operation of a base station using two indication bits in accordance with a second embodiment of the present invention.

The present invention relates to a mobile communication system, and more particularly, to a method for performing a state transition for a data service in a mobile terminal.

The typical mobile communication system provided only a voice service, but as a user's demand is increased and communication technology is rapidly developed, it is being developed to support not only a voice service but also a data service for video communication and the Internet. In general, a mobile communication system such as Code Division Multiple Access (CDMA) 2000 1xEV-DV (Evolution Data and Voice), which provides voice and data services, is a subscriber station, a mobile station (MS) and a base station (BS). ). A base station of such a mobile communication system usually separates a circuit channel for a voice service and a packet channel for a data service, and allocates and operates the remaining packet except for the radio resource used for the circuit channel to the packet channel. do. Here, the radio resources used in the base station include a power amount, a number of Walsh codes, and a time interval (time slot).

In the CDMA2000 1xEV-DV, a forward packet data channel (F-PDCH) for a data service is referred to as a forward packet data channel (hereinafter referred to as F-PDCH). And intervals in which no data is transmitted may appear irregularly. Accordingly, the mobile terminal and the base station transition to the control hold mode (CHM) in a period where data is not normally transmitted, and when the data is generated, the mobile terminal and the base station transition to the active mode (AM) again. In the control hold mode, the reverse channel and the forward channel are intermittently transmitted. This is one of the techniques for saving the radio resources of the base station and minimizing the power consumption of the mobile terminal.

1 is a message flow diagram illustrating an example of a state transition operation of a mobile terminal according to the prior art. Herein, a forward common assignment channel (hereinafter referred to as F-CACH) is allocated between the mobile station MS and the base station BS, which is monitored by the mobile station to transition from the control hold mode to the active mode. Channel. The base station transmits a Resource Allocation Message (RAM) or a Resource Allocation Mini Message (RAMM) through the F-CACH. The RAM or RAMM serves as a state transition indication message for instructing the transition from the control hold mode to the activation mode.

Referring to FIG. 1, the mobile terminal in the control hold mode continuously monitors the F-CACH while intermittently transmitting a reverse pilot signal and reverse channel quality indicator information through a reverse channel. At this time, a Forward Fundamental Channel (F-FCH) or a Forward Dedicated Control Channel (F-DCCH) for data services is not allocated. In addition, the base station in the control hold mode intermittently transmits a power control bit (PCB), which is information for forward power control, through a forward common power control channel (hereinafter, referred to as F-PCCH). Here, intermittently transmitted means that the information transmitted between the base station and the mobile terminal is not discontinuously transmitted but discontinuously according to a predetermined period. The intermittent period is determined by a control message exchanged between the base station and the mobile terminal before data communication is performed.

When data to be transmitted to a mobile terminal occurs, the base station transmits a RAM or a RAMM having a MAC_ID (Media Access Control Identifier), which is a unique identifier of the corresponding mobile terminal, through the F-CACH, and then forward forward channels (F_SPDCCH), which are forward control channels. Encoder Packet (EP) size and slot length of packet data to be currently transmitted are transmitted through Data Control Channel (F_PDCCH) / F_PDCCH (Forward Primary Packet Data Control Channel). The base station then transitions to the active mode and transmits data over the F-PDCH. When the mobile station receives a RAM or a RAMM having its MAC_ID from the base station through the F-CACH, the mobile station monitors the F-SPDCCH and the F-PPDCCH to receive an encoder packet size and slot length of packet data. The mobile terminal then transitions to the activation mode and decodes the data received through the F-PDCH. In the activation mode, all information interrupted (reverse pilot signal and reverse channel quality indication information, PCB) is transmitted at the full rate.

However, in the conventional state transition method as shown in FIG. 1, a dedicated F-CACH must always be allocated between the base station and the mobile terminal, and the mobile terminal must continuously monitor the allocated channel, thereby increasing power consumption of the mobile terminal device. There was a problem.

2 is a message flow diagram illustrating another example of a state transition operation of a mobile terminal according to the prior art.

According to FIG. 2, a dedicated channel is not allocated between the mobile terminal and the base station in the control hold mode, and only the F-SPDCCH and the F-PDCCH are allocated. As in FIG. 1, the mobile terminal in the control hold mode intermittently transmits the reverse pilot signal and the reverse channel quality indication information. Unlike in FIG. 1, however, the base station in the control hold mode transmits the F-SPDCCH at the maximum transmission rate, and the mobile station continuously monitors the F-SPDCCH.
When data to be transmitted is generated, the base station transmits the MAC_ID of the mobile terminal through the F-SPDCCH, transitions to the activation mode, and transmits the data through the F_PDCH. When the mobile station receives its MAC_ID from the F-SPDCCH, the mobile station transitions to the activation mode and decodes the data received through the F-PDCH. The mobile terminal in the active mode transmits the reverse pilot and the reverse channel quality information at the maximum data rate.

3 is a flowchart illustrating an operation of a mobile terminal for transitioning from a control hold mode to an active mode according to FIG. 2.

Referring to FIG. 3, the mobile terminal in the control hold mode continuously monitors the F-SPDCCH. (300) The mobile terminal decodes the F-SPDCCH to determine whether its MAC_ID is detected and does not detect its MAC_ID. If the MAC_ID is detected in step 305, the mobile station transitions to the activation mode and starts receiving the F-PDCH from the base station (310). PICH (Reverse Pilot Channel) and R-CQICH (Reverse Channel Quality Indicator Channel) are transmitted at the maximum transmission rate (315).

4 is a flowchart illustrating an operation of a base station for transitioning from the control hold mode to the active mode according to FIG. 2.

In FIG. 4, when data to be transmitted from the base station in the control hold mode is generated to the mobile terminal, the base station transmits the MAC_ID of the mobile terminal to the F-SPDCCH (400), transitions to the activation mode, and transmits the packet data through the F-PDCH. The base station transmits the F-CPCCH at the maximum transmission rate (410). At this time, the PCB transmitted to the F-CPCCH is intermittently received through the R-PICH and R-CQICH of the reverse link. It is determined by referring to the information.

However, even in the state transition method shown in Figs. 2 to 4, the mobile terminal needs to continuously monitor the F-SPDCCH or F-PDCCH without knowing the presence or absence of the state transition message in the control hold mode, thereby unnecessary power of the mobile terminal. There was a problem that exhaustion occurred.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, relates to a method for performing a state transition between a control hold mode and an activation mode for data service in a mobile terminal and a base station.

Another object of the present invention is to provide a fast state transition method from the control hold mode to the active mode to reduce the consumption of radio resources in the forward link.

Another object of the present invention is to provide a fast state transition method from the control hold mode to the active mode to minimize the power consumption of the mobile terminal in the reverse link.                         

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In order to achieve the above object, the method of the present invention provides an activation mode by determining whether there is data to be transmitted from the base station by a mobile terminal transitioned to the control hold mode during a period in which the base station does not transmit data during data service. In the method to return to,

Detecting at least one indication bit predetermined in at least one slot allocated for the mobile terminal on a first forward channel from the base station;

Monitoring the second forward packet data control channel from the base station to determine whether to transition to the activation mode when the at least one indication bit indicates that there is data to be transmitted from the base station;
And when the control information including the unique identifier of the mobile terminal is received as a result of monitoring the forward packet data control channel, returning to the activation mode to receive data from the base station.

Another method of the present invention devised to achieve the above object is that the base station transitioned to the control hold mode in the period of no data to be transmitted to the mobile terminal during the data service to return to the activation mode to resume the transmission of data. In the method,

When data to be transmitted to the mobile terminal is generated, there is data to be transmitted by the base station at least one indication bit transmitted through at least one slot allocated to the mobile terminal on a forward wake-up channel to the mobile terminal. Setting to a value indicating

After transmitting the at least one indication bit, transmitting control information including a unique identifier of the mobile terminal through a forward packet data control channel to the mobile terminal.

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, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention to be described later allocates a forward wake-up channel (hereinafter referred to as F-WUCH) between the mobile terminal and the base station. The F-WUCH delivers information indicating whether the mobile terminal monitors a dedicated control channel (Wake-Up Indicator: WUI). The mobile terminal in the control hold mode continuously monitors the F-WUCH to detect predetermined indication information, and when the detected indication information instructs to monitor the dedicated control channel, the mobile terminal wakes up to supply power to the demodulation related circuit. Decoding the control channel.

In the control hold mode, the mobile terminal shuts down power supplied to a circuit unit related to a radio frequency (hereinafter referred to as RF) and a circuit unit related to demodulation, thereby preventing unnecessary power consumption. This state will hereinafter be referred to as sleep. The mobile terminal in the sleep state wakes up a short time before the F-WUCH reaches its pre-allocated timeslot, detects the indication information, and receives a radio frequency (RF) when monitoring of the dedicated control channel is instructed. Power up the circuit section and the demodulation circuit section.

5 is a message flow diagram illustrating a state transition operation of a mobile terminal according to the present invention.

Referring to FIG. 5, when data to be transmitted in the control hold mode (CHM) is generated, the base station transmits maximum indication information predetermined to the mobile station in a specific time slot of a forward wake up channel (F-WUCH). Transmit at full rate. The indication information indicates whether the mobile terminal monitors a dedicated control channel, that is, a forward packet data control channel (F-PDCCH). That is, in the control hold mode, the mobile terminal operates in a sleep mode, wakes up only in the F-WUCH slot to be monitored, and receives predetermined indication information. The F-SPDCCH is monitored according to the indicated indication information.

In more detail, in the control hold mode, the base station intermittently transmits a power control bit (PCB) through a forward common power control channel (F-CPCCH). When data to be transmitted to a mobile terminal occurs, the base station transmits predetermined indication information through a slot allocated to the mobile terminal in the F-WUCH, and includes a control including a media access control identifier (MACID) of the mobile terminal through the F-PDCCH. After transmitting the information, the transition to the activation mode transmits data through the F-PDCH (Forward Packet Data Channel). In this case, the MAC_ID is information allocated to the mobile terminal when starting the data service, and is used to identify mobile terminals in data service in the base station.

In the control hold mode, the mobile station intermittently transmits a reverse pilot channel (R-PICH) and a reverse channel quality indicator channel (R-CQICH), and the mobile station of the F-WUCH It wakes up only in the time slot to retrieve the indication information. Herein, the position of the F-WUCH slot allocated to the mobile terminal is determined at the time of call setup for data service between the base station and the mobile terminal, which will be described later.

If no indication information is detected in the assigned slot of the F-WUCH, the mobile terminal goes back to sleep and waits until it reaches the next assigned F-WUCH slot. On the other hand, if the indication information is detected, the mobile terminal wakes up and monitors the F-PDCCH. Upon receiving its MAC_ID through the F-PDCCH, the mobile terminal transitions to the activation mode and starts receiving data through the F-PDCH.
In the active mode, the mobile station transmits a reverse pilot channel (R-PICH) and a reverse channel quality indication channel (R-CQICH) at the maximum transmission rate, and the base station transmits a forward common power control channel (F-CPCCH). ) At maximum speed.

6 is a diagram illustrating channels for state transition operation of a base station and a mobile terminal according to the present invention. Here, FIG. 6 illustrates an F-WUCH composed of a 40ms long frame divided into 256 slots, but the frame length and the number of slots of the F-WUCH may be easily changed according to a designer's intention.

Referring to FIG. 6, in the control hold mode, the base station BS intermittently transmits the F-CPCCH according to a predetermined intermittent period. At this time, the interruption period is determined by a signaling message transmitted from the base station to the mobile terminal during the call setup procedure. When data to be transmitted to the mobile terminal is generated, the base station transmits predetermined indication information, that is, WUI, to the mobile terminal MS through the F-WUCH. The WUI is transmitted in a slot previously allocated between the base station and the mobile terminal. Here, an example of the F-WUCH transmitting a 1-bit WUI is shown.

When the base station transmits a WUI for a mobile terminal at a predetermined position (slot) of 40 ms frame composed of 256 slots, the terminal detects a WUI transmitted at a pre-assigned position (slot) of every frame. After transmitting the WUI in the assigned slot of the F-WUCH, the base station transmits control information including the MAC_ID of the mobile terminal to the F-PDCCH and transmits the F-CPCCH at the maximum transmission rate.

In FIG. 6, 'A', 'B', 'C', and 'D' show the time required until the terminal receives its MAC_ID through the F-SPCCH. That is, 'A' is the time taken to receive and decode the WUI through the F-WUCH, 'B' is the time taken to find the synchronization of the F-PDCCH, 'C' is the mobile terminal through the F-PDCCH 'D' is the time taken to decode the control information including the received MAC_ID, and 'D' decodes the data received through the F-PDCH and transmits ACK (Acknowledge) / NACK (NACK) in response thereto. It's time to take. And Tmot represents the time that the terminal monitors the F-PDCCH.
As shown, the mobile terminal in the control hold mode intermittently transmits the R-PICH and the R-CQICH, and after receiving its MAC_ID, transitions to the activation mode and receives data through the F-PDCH. R-CQICH is transmitted at the maximum transmission rate.

Hereinafter, a procedure of transmitting wake-up indication information (WUI) through the F-WUCH will be described in more detail. The wake-up indication information transmitted through the F-WUCH may be configured to have a very short length compared to the message transmitted through the F-PDCCH. Preferably, the indication information consists of one indication bit or two indication bits to further improve reliability.

First, the first embodiment of the present invention in which the indication information (WUI) transmitted through the F-WUCH consists of one indication bit will be described.

7 shows a structure of an F-WUCH for transmitting one indication bit according to the first embodiment of the present invention.

Referring to FIG. 7, the F-WUCH delivers a 40 ms long frame that is periodically repeated, and each frame is divided into 256 slots. Each slot has a length of 0.15625 ms, and each frame is assigned one slot (eg, a slot index having 128 slots) to a specific mobile terminal. The mobile terminal in the sleep state wakes up when the slot is allocated, detects an indication bit, and returns to the sleep state. Since the indication bit has a very short length compared to the message of the F-PDCCH, the time for the mobile terminal to wake up to detect the indication bit is very short and negligible in terms of power consumption. If the indication bit does not indicate to monitor the F-PDCCH, the mobile terminal continues to sleep until the assigned slot of the next frame period.

8 is a flowchart illustrating an operation of a mobile terminal transitioning from the control hold mode to the active mode using one indication bit according to the first embodiment of the present invention.

Referring to FIG. 8, in the control hold mode, the mobile terminal wakes up and detects an indication bit (WUI) in the allocated slot of the F-WUCH when it reaches its assigned slot. If the value of the indication bit detected in the slot allocated to the device is “ON”, the mobile station monitors the F-PDCCH (800). If the value of the detected indication bit is " OFF ", the base station determines that there is no data to transmit to the mobile terminal and returns to step 800 to determine the next allocated slot. Sleep until
When the MAC_ID is detected in step 815, the mobile station transitions to the activation mode, decodes the data received through the F-PDCH from the base station, performs error detection, and returns the error detection result to the base station as HARQ ACK / NACK. The mobile terminal also transmits a reverse pilot channel (R-PICH) and a reverse channel quality indicator channel (R-CQICH) at the maximum transmission rate (825).

9 is a flowchart illustrating the operation of a base station using one indication bit according to the first embodiment of the present invention.

In FIG. 9, when data to be transmitted to the mobile terminal is generated, the base station in the control hold mode sets the value of the indication bit transmitted through the allocated slot of the mobile terminal to "ON" in the F-WUCH (900). After transmitting the MAC_ID of the mobile terminal to the F-PDCCH (905), it transitions to the activation mode and starts transmitting packet data through the F-PDCH. (910) Meanwhile, the base station transmits the F-CPCCH at the maximum transmission rate. (915)
10 is a diagram illustrating operations of a mobile terminal and a base station according to the first embodiment of the present invention during continuous packet transmission. In the current 1xEV-DV system, it is possible to perform continuous packet transmission between the base station and the mobile terminal using a 2-bit WUI, Figure 10 shows the operation in this case. The mobile terminal and the base station in FIG. 10 can perform two operations as follows.
In the first case, when the continuous transmission of packet data started by the indication bit of the first frame in the F-WUCH is terminated before the next indication bit is transmitted to the second frame, the base station determines the first frame. Set the indication bit of 'ON (1)' and the indication bit of the second frame to 'OFF (0)'. The monitoring of the F-PDCCH started by the indication bit of the first frame then ends by the indication bit of the second frame. Therefore, the mobile station monitors the F-PDCCH for at least 40 ms when receiving the indication bit of the first frame.
In the second case, if the continuous transmission of the packet data starting from the indication bit of the first frame in the F-WUCH ends after the next indication bit is transmitted to the second frame, the base station is configured with the indication bit of the first frame. All of the indication bits of the second frame are set to 'ON (1)'. The mobile station then continues to monitor the F-PDCCH by the indication bits.

Next, a second embodiment of the present invention in which the indication information (WUI) transmitted through the F-WUCH is composed of two indication bits will be described.

11 shows a structure of an F-WUCH for transmitting two indication bits according to the second embodiment of the present invention.

Referring to FIG. 11, as in FIG. 7, the F-WUCH periodically transmits 40 ms long frames, and each frame is divided into 256 slots. Here, two slots (for example, slot indexes of 4 and 251) of the allocated positions are allocated to a specific mobile terminal every frame. Each of the two slots carries one indication bit and the state transition condition of the mobile terminal according to the two indication bits is shown in FIG. 12.

Referring to FIG. 12, the mobile terminal in the sleep state wakes up in the allocated first slot of every frame to detect the first indication bit. If the detected first indication bit is '0 (OFF)', the mobile terminal maintains a sleep state until the allocated first slot of the next frame. On the other hand, if the detected first indication bit is '1 (ON)' or its value cannot be determined, that is, 'Erasure', the second indication bit is detected in the allocated second slot of the current frame.
If the detected second indication bit is '0 (OFF)', the mobile terminal maintains a slim state until the allocated first slot of the next frame. On the other hand, if the detected second indication bit is '1 (ON)' or 'Erasure', the wake-up monitors the F-PDCCH. If the MAC_ID is not detected as a result of monitoring the F-PDCCH, the mobile terminal returns to the sleep state.

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13 is a flowchart illustrating an operation of a mobile terminal transitioning from a control hold mode to an active mode using two indication bits according to a second embodiment of the present invention.

Referring to FIG. 13, in the control hold mode, the mobile station intermittently transmits the R-PICH and the R-CQICH on the reverse link while maintaining the sleep state of the forward link (1300). Detect the first indication bit (WUI # 1) in the allocated first slot of the WUCH (1305) and determine the detected first indication bit (1310). If the first indication bit cannot be detected or the If the detected first indication bit is not 'ON', the process returns to the process 1300. On the other hand, if the detected first indication bit is 'ON', the second indication bit (WUI # 2) is detected (1315) in the allocated second slot of the F-WUCH, and the detected second indication bit is determined. If the second indication bit cannot be detected or the value of the detected second indication bit is not 'ON', the process returns to the process 1300.
On the other hand, if the detected second indication bit is also 'ON', the mobile terminal monitors the F-PDCCH (1325) and checks whether its own MAC_ID is received. (1330) If its MAC_ID is detected in step 1330, The mobile terminal transitions to the activation mode, decodes the data received from the base station via the F-PDCH, performs error detection, and feeds back the error detection result as ACK / NACK to the base station. (1335) The mobile terminal also transmits the R-PICH. (Reverse Pilot Channel) and R-CQICH (Reverse Channel Quality Indicator Channel) are transmitted at the maximum transmission rate (1340).

14 is a flowchart illustrating the operation of a base station using two indication bits according to the second embodiment of the present invention.

In FIG. 14, the base station in the control hold mode intermittently transmits the F-CPCCH, and when there is data to be transmitted to the mobile terminal, the first indication bit (WUI) transmitted through the allocated first slot of the mobile terminal in the F-WUCH. # 1) is set to "ON" and transmitted (1400), and the second indication bit (WUI # 2) transmitted through the allocated second slot of the mobile terminal is set to "ON" and transmitted (1405). Subsequently, the base station transmits the MAC_ID of the mobile station to the F-PDCCH (1410) and then transitions to an activation mode and starts transmitting packet data through the F-PDCH.

In the following, a method of allocating slots to be monitored for wake-up by a mobile terminal in F-WUCH will be described. This is to distribute the slots in order to minimize mutual interference caused by the indication information transmitted by the base station to the mobile terminal in service. There may be various methods for allocating slots for transmitting indication information. In the present specification, a first method using a hashing algorithm using a unique index of a mobile terminal as a hash key and a second method using a control message are preferred embodiments. Explain.

First, a first method for transmitting indication information will be described.

Every mobile terminal registered in the mobile communication system has some kind of ID to be uniquely identified. Among these, there is a 32-bit digit International Mobile Station Identifier (IMSI) as an ID of a mobile terminal commonly used internationally. Bits 0 through 15 of the 32-bit IMSI are defined as lower bits (L), and bits 16 through 32 are defined as upper bits (H).

According to the second embodiment of the present invention, if the indication information consists of two indication bits R1 and R2, the positions of the slots in which the indication information is carried in the frame are determined according to Equation 1 below. .

In Equation 1, X is a value determined according to a transmission characteristic of the F-WUCH, in particular, a data rate. If the transmission rate of the F-WUCH is 4.8 Kbps, X is 4, and if 9.6 Kbps, X is 8. That is, this is a value determined according to the F-WUCH. Then, the position at which the indication information is transmitted depends on the transmission frame length of the F-WUCH. "N" is also a value determined by the data transmission rate of the F-WUCH like "X". If 9.6 Kbps, N is 384. If 4.8 Kbps, 192 is applied. In addition, DECORR1 and DECORR2 are determined according to Equation 2 below.

In Equation 2, t is a system time.

Next, a second method for transmitting indication information will be described.

The standard IS-2000 defines an extended release message (ERM), an extended release mini message (ERMM), and a universal handoff direction message (UHDM) for releasing a packet data channel and transitioning to a control hold mode. Therefore, one of the messages is used by adding a field for notifying the mobile terminal of the slot information allocated to the F-WUCH.

Table 1 below shows the format of the proposed ERM according to the present invention.

Information field Length (bits) USE_TIME One ACTION_TIME 0 or 6 CH_IND 3 GATING_RATE_INCL One PILOT_GATING_RATE 0 or 2 WUCH_ID 0 or 2 WUSCH_ID 0 or 4

Table 1 shows the format of ERM in which WUCH_ID (Wake_up Channel ID) and WUSCH_ID (Wake_up SubChannel ID) are added to information fields defined in standard IS-2000. The WUCH_ID informs the mobile terminal receiving the message of the wake-up channel information, and the WUSCH_ID informs the slot information allocated to the mobile terminal in the wake-up channel. The two fields have a value only when the value of GATING_RATE_INCL is set to '1'. If the value of the GATING_RATE_INCL is set to '1', the mobile terminal intermittently transmits the reverse pilot at the transmission rate specified in the PILOT_GATING_RATE in the control hold mode and also periodically monitors the wake-up channel slot specified by the WUCH_ID and WUSCH_ID. do.

In the ERM shown in Table 1, four wake-up channels (2-bit WUCH_ID) and each wake-up channel may designate 16 slots (4-bit WUSCH_ID). If the indication bit consists of only one bit, only one slot is allocated to each mobile station. Accordingly, the ERM can accommodate up to 64 mobile terminals in the control hold mode. The number of bits of the WUCH_ID may change depending on the number of mobile terminals in the control hold mode to be accommodated in the system. In addition, the number of bits of the WUSCH_ID may be changed according to the number of slots that can be allocated in one wake-up channel. For example, when the number of bits of the WUSCH_ID is 3, one wake-up channel may accommodate 8 control-hold mode mobile terminals. The maximum number of control-hold mode mobile terminals that can be accommodated can be obtained by Equation 3 below.

(Number of wake-up channels) * (number of slots allocated per wake-up channel)

Here, the number of wake-up channels is the number ^{of bits} of 2 ^WUCH_IDs, and the number of slots allocated per wake-up channel is the number ^{of bits} of 2 ^WUSCH_IDs .

In other cases, WUCH_ID and WUSCH_ID may be added to other messages such as ERMM or UHDM to designate a slot to be monitored by the mobile terminal in control hold mode. In another case, another message including WUCH_ID and WUSCH_ID may be used. This message may be transmitted through a dedicated control channel or a common control channel transmitted from the base station to the mobile terminal. If it is transmitted through a common control channel, an additional field for indicating a destination mobile terminal is used.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention is to minimize the power consumption of the mobile terminal transitioned to the control hold mode in the period when no data is transmitted, and to save the radio resources of the base station used to instruct the mobile terminal to transition to the active mode in the control hold mode can do. In addition, there is an effect that the base station and the mobile terminal can be quickly synchronized to the transition to the activation mode.

Claims (16)

A method for a mobile terminal transitioned to a control hold mode in a section in which a base station does not transmit data during a data service, determines whether there is data to be transmitted from the base station, and returns to an active mode. Detecting at least one indication bit predetermined in at least one slot allocated for the mobile terminal on a forward wake-up channel from the base station; Monitoring the control channel from the base station to determine whether to transition to the active mode when the at least one indication bit indicates that there is data to be transmitted from the base station, And returning to the activation mode to receive data from the base station when a unique identifier of the mobile terminal is received as a result of monitoring the control channel. 2. The method of claim 1, further comprising: maintaining the control hold mode until the at least one assigned slot indicates that there is data to be transmitted from the base station. Way. 2. The method as claimed in claim 1, wherein the allocated slot is designated according to a unique identifier of the mobile terminal at the time of call setup for the data service. 4. The method as claimed in claim 3, wherein the allocated slot position is designated by performing a hashing algorithm using a unique index of the mobile terminal as a hash key. 2. The method as claimed in claim 1, wherein the slot allocated for the mobile terminal on the wake-up channel is designated by a control message received from the base station upon call setup for the data service. The method of claim 5, wherein the control message comprises: an information field for indicating the forward wake-up channel among a plurality of forward channels, and an information field for indicating the position of the allocated slot in the forward wake-up channel. The method characterized in that it comprises a. The method of claim 1, wherein the mobile terminal in the control hold mode intermittently transmits a reverse pilot signal and reverse channel quality indication information to the base station. The method as claimed in claim 1, wherein the mobile station in the activation mode transmits a reverse pilot signal and reverse channel quality indication information to the base station at the maximum transmission rate. The method of claim 1, wherein the monitoring of the forward packet data control channel comprises: Detecting a first indication bit in a first slot allocated for the mobile terminal on the forward wake-up channel; Checking whether the first indication bit is lost or set to a predetermined value indicating that there is data to be transmitted by the base station; Detecting a second indication bit in a second slot allocated for the mobile terminal on the forward wake-up channel if the first indication bit is missing or set to the predetermined value; Monitoring the forward packet data control channel if the second indication bit is missing or set to a predetermined value indicating that there is data to be transmitted by the base station. A method for a base station transitioned to a control hold mode to return to an active mode to resume data transmission in a section in which there is no data to be transmitted to a mobile terminal during a data service, When data to be transmitted to the mobile terminal is generated, there is data to transmit to the base station at least one indication bit transmitted through at least one slot allocated to the mobile terminal on a forward wake-up channel to the mobile terminal. Setting to a value indicating And after transmitting the at least one indication bit, transmitting a unique identifier of the mobile terminal through a forward packet data control channel to the mobile terminal. The method as claimed in claim 10, wherein the allocated slots are designated according to a unique index of the mobile terminal when setting up a call for the data service. 12. The method of claim 11, wherein the allocated slot position is designated by performing a hashing algorithm using a unique index of the mobile terminal as a hash key. The method as claimed in claim 10, wherein the allocated slot is designated by a control message transmitted to the mobile terminal when a call is set up for the data service. 15. The apparatus of claim 13, wherein the control message comprises: an information field for indicating the forward wake-up channel among a plurality of forward channels, and an information field for indicating the position of the allocated slot in the forward wake-up channel. The method characterized in that it comprises a. 12. The method of claim 11, wherein the base station in the control hold mode intermittently transmits a forward power control channel to the mobile terminal. 12. The method of claim 11, wherein the base station in the activation mode transmits a forward power control channel at a maximum transmission rate.

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