KR20080067273A - Method and apparatus for drx resume after up-link data transmission in mobile telecommunication system - Google Patents

Abstract

A reverse data processing method of a terminal which performs a discontinuous receiving action in a mobile communication system and a device thereof are provided to control a sleeping section and an active section variably by considering whether reverse data is retransmitted, thereby more flexibly operating in discontinuous receiving mode. When reverse data is generated in a terminal which performs a discontinuous receiving action(305), the terminal demands transmission resource allocation by reporting a buffer situation to a base station(310). The terminal starts an active period(315). If final data satisfies one of two discontinuous receiving triggering conditions, the terminal receives control information which notifies of 'discontinuous receiving action resume' in an MAC(Medium Access Control) PDU(Packet Data Unit) for receiving the final data, and sends the control information(345). If transmission of the MAC PDU is completed, the terminal resumes a discontinuous receiving action(350).

Description

Method and apparatus for reverse data processing of terminal performing discontinuous reception operation in mobile communication system TECHNICAL FIELD

The present invention relates to a mobile communication system, and more particularly, to a method and apparatus for processing reverse data by a terminal performing a discontinuous reception operation.

The Universal Mobile Telecommunication Service (UMTS) system is based on the European system of Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), and is used for wideband code division multiple access (hereinafter referred to as " CDMA ') is a third generation asynchronous mobile communication system.

First, in the conventional third generation mobile communication system, a terminal in an idle state discontinuously receives a paging message in order to minimize power consumption of the terminal. That is, the terminal turns on the transceiver at a predetermined time, that is, wakes up to monitor the paging channel. When the paging message of the terminal is received through the paging channel, the terminal transitions to a connected state, and if the paging message of the terminal is not received through the paging channel, the terminal turns off the transceiver and maintains a sleep state until the next wake up time. .

The reason why the conventional idle terminal is applied to the discontinuous reception is because the voice call is mainly used in the conventional mobile communication system, and thus, the duration of the terminal staying in the connected state is relatively short.

However, in the next generation mobile communication system such as LTE, which is newly discussed, the terminal is expected to be provided with voice packet service as well as voice call. The terminal provided with such a packet service may stay in a connected state for a relatively long time, and it is necessary to fundamentally solve the minimization of power consumption for the connected state terminal for such a long time.

Accordingly, in the next generation mobile communication system, the network can set an appropriate discontinuous reception mode in consideration of characteristics of a service being driven to the connected state terminal.

1 is a diagram illustrating a concept of a discontinuous reception operation.

Referring to FIG. 1, discontinuous reception generally consists of the following elements.

Active State: An interval in which the receiver of the terminal is on, and the terminal checks the existence of downlink data in the activated state and receives the data.

Sleep State: A period in which the receiver of the terminal is off, and is set to minimize power consumption of the terminal.

DRX cycle length (110, 120): length between activation interval and activation interval

Since the discontinuous (DRX) operation is a method for receiving data while minimizing power consumption of the terminal, start and end of an activation state are defined in connection with data reception.

That is, the start point 130 of the activation state, the end point of the activation state, and the like are determined in consideration of the time of receiving data, the amount of data received, and the like.

2 is a diagram illustrating the effect of reverse data generated on a terminal in a discontinuous reception operation on a discontinuous reception operation.

Referring to FIG. 2, the discontinuous reception period is set to a length between 205, 210, 215, and 217, which are activation periods.

However, if reverse data is generated in the terminal performing the discontinuous reception operation as described in step 220, that is, when the terminal needs to perform the transmission operation, even if the corresponding time is the sleep state on the discontinuous reception operation, the terminal is activated. Transition to state should be performed (225).

In addition, in this case, the terminal corresponds to an acknowledgment (hereinafter, referred to as ACK) signal / negative acknowledgment (NACK) according to HARQ in response to the transmission operation of step 225. ) May involve receiving a signal.

Accordingly, when the ARQ operation is performed, the terminal maintains an activation state in order to receive an ACK / NACK signal indicating whether a reception error for the reverse data is received from the base station.

The period in which the terminal actually stays in the active state may be defined as the sum of the activation state defined for the discontinuous reception operation and the activation state for the transmission operation, as shown in FIG.

In other words, for example, as shown in a of FIG. 2, an activation section for receiving forward data is set in an arbitrary terminal (205, 210, 215, 217), and backward data is generated at an arbitrary time point 'E' which is a sleeping section. After the transition to the activated state (220) (225), it is assumed that the active state is maintained until the 'F' point.

At this time, the overall activation interval of the actual terminal is the sum of the activation interval for data reception and the activation interval for data transmission (230, 235, 240, 245).

That is, when the terminal transitions to the active state for the transmission operation as described above, it is very important to define a time point to terminate the activation state in order to ensure the efficiency of the discontinuous reception operation of the terminal.

Therefore, in the conventional mobile communication system such as the Universal Mobile Telecommunication Service (UMTS) system, once the system transitions to the active state for reverse data transmission, the mobile terminal maintains the active state until the network gives a separate instruction. That is, the termination of the activation state and the resumption of the discontinuous reception operation were made by the control of the network.

In addition, the conventional discontinuous reception operation of the UMTS targets an idle terminal that does not involve substantial data transmission and reception.

However, in the next-generation mobile communication system newly discussed based on UMTS, the terminal in a connected state operates in a discontinuous reception mode in response to a voice packet service. That is, this is a discontinuous reception operation in the terminal state, which is different from the terminal in the idle state in which the conventional data transmission and reception are not accompanied.

Therefore, in this context, if reverse data has been generated in a terminal in a connected state performing a discontinuous reception operation, it is not preferable to maintain the activated state of the terminal in terms of power consumption.

Therefore, in a next generation mobile communication system, when a terminal in a connected state operates in a discontinuous transmission / reception mode, it is necessary to newly define an activation state according to reverse data generation. That is, in the next generation mobile communication system, there is a need to define an activation state according to a state of a terminal and to propose a more efficient power consumption by operating a discontinuous transmission / reception of the terminal in response to the activation state.

Accordingly, the present invention devised to solve the problems of the prior art operating as described above provides a terminal apparatus and method for transmitting reverse data and supporting discontinuous reception in a mobile communication system.

The present invention also provides an apparatus and method for efficiently controlling power consumption by a terminal in a connected state in a mobile communication system variably setting an activation state according to reverse data generation.

The present invention also provides an apparatus and method for notifying a network that a terminal in a connected state performing a discontinuous reception operation in a mobile communication system transmits reverse data and operates again in a sleep state.

The present invention relates to a method for discontinuous transmission of reverse data by a discontinuous receiving terminal in a mobile communication system, the method comprising: receiving a radio resource control connection establishment message including a discontinuous reception start time and a discontinuous reception period from a base station and establishing a connection; Maintaining a sleep state with the discontinuous reception period at the start of discontinuous reception; Detecting the occurrence of reverse data and transitioning to an active state; transmitting reverse data including control information indicating transition to a sleep state according to whether forward data corresponding to the reverse data is received; Characterized in that the process includes the transition to the sleep state.

In the present invention, a terminal device transmitting reverse data includes at least one radio link control (RLC) block for receiving data generated from a higher layer and reconstructing a packet of a predetermined transmission unit, and a transmission unit received from the RLC block. A medium access control (MAC) block for checking and multiplexing retransmission of the packets of the packet and a predetermined discontinuous reception period at the start of a predetermined discontinuity with the network in consideration of retransmission and transmission of the packet of the transmission unit received from the RLC block. It characterized in that it comprises a discontinuous reception control block for controlling the transmission and reception device on / off with a discontinuous reception period different from.

According to the present invention, in the reverse data transmission method, in response to the reverse data generation, a process of transmitting a transmission resource allocation request signal to the scheduler of the base station, starting an activation period, and when the transmission resource is allocated, The method includes transmitting data using the allocated transmission resource until the data transmission is completed, and determining the discontinuous reception period according to the type of the last data.

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

The present invention has the advantage of using the discontinuous reception mode more flexibly by controlling the activation period and the sleep interval determined in consideration of the retransmission for the reverse data in the terminal transmits the reverse data.

In addition, the power consumption of the terminal is minimized by maintaining the activation interval in a variable length corresponding to the nature of the backward transmission data.

In addition, by notifying the network of the activation state and the sleep state of the terminal corresponding to the discontinuous reception mode, the network ensures the reliability and efficiency of the transmission resource allocation according to the reverse data transmission and reception.

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.

On the other hand, the present invention describes a new generation mobile communication system, LTE system that is newly proposed based on the asynchronous third generation mobile communication system as an example. Hereinafter, the present invention can be applied to other communication systems applying the discontinuous reception mode without any addition or subtraction. In addition, it can be applied to the mobile communication system to which the base station scheduling is applied without any addition or subtraction.

In addition, the present invention is applicable to a mobile communication system supporting a reverse service. In addition, the present invention is applicable to a system that applies an automatic retransmission request (hereinafter referred to as 'ARQ') and a complex automatic retransmission request (Hybrid-ARQ).

In the present invention, when reverse data is generated in a terminal in discontinuous reception operation, the discontinuous reception is stopped and the reverse data is transmitted. Then, the discontinuous reception is resumed at the most suitable time according to the characteristics of the transmitted data, Present method and apparatus for notification.

More specifically, in the present invention, the terminal performing the discontinuous reception operation transitions to the activated state according to the reverse data transmission, and after performing the reverse data transmission, appropriately determines the end point of the activation period according to the nature of the data to be transmitted. Setting it to Then, a method of notifying the base station is proposed.

3 is a view showing the overall operation of the terminal for controlling the discontinuous reception operation according to the present invention.

Hereinafter, in the present invention, the terminal transitions to the active state, the terminal is turned on the transceiver. And when the terminal terminates the activation state, the terminal turns off the transceiver. Since the discontinuous reception operation is not substantially performed when the terminal is in the active state, the terminal terminates the activation state and the terminal resumes the discontinuous reception operation in the same sense.

In addition, in the present invention, the reverse data may be classified as causing or not receiving the forward data according to the type thereof.

As an example, the data that causes the reception of the forward data may be the last packet of data to which the ARQ of the second layer is applied, and the data that does not cause the reception of the forward data may be data to which the ARQ is not applied. Here, ARQ is a technique of checking the serial number of a received packet and requesting retransmission of the received packet. That is, the ARQ scheme does not soft combine previously received packets and retransmitted packets.

In this regard, in a general ARQ protocol such as Radio Link Control (hereinafter referred to as 'RLC'), the transmitting side transmits a series of packets and controls that require a 'packet reception status report' to the last packet. Include the information and send it.

This control information is called a 'POLL', and when the receiving side receives a packet including a poll, the receiver receives the serial number of the packets received up to that point and the serial numbers of the packets requiring retransmission in the reception status report message. Send it.

If the terminal transmits a packet including a poll as described above, since the reception status report message will be sent to the terminal in the near future, it is preferable that the terminal maintains an activated state.

On the other hand, if the terminal receives a poll and transmits a reception status report message, since there will be no further packet transmission and reception after transmitting the reception status report message, it is preferable to terminate the activation state and resume the discontinuous reception operation.

In the following embodiment of the present invention, when the terminal transmits the last packet stored in the transmission buffer, the MAC PDU containing the packet according to the type of the packet, the activation state is terminated and resume the discontinuous reception operation; The control information to be notified is stored together and transmitted. When the transmission of the MAC PDU is completed, the discontinuous reception operation is resumed.

And, according to the type of the packet transmits the MAC PDU not containing the control information to inform the 'the activation state is terminated and resume the discontinuous reception operation,' and when the transmission of the MAC PDU is completed, a predetermined timer is driven And keeps the activation state until the timer expires. By allowing the terminal to determine the end of the activation state as described above, the activation state is terminated at the most appropriate time point, and the base station is notified of the end of the activation state to prevent the problem of allocating transmission resources to the terminal in the sleep state.

Referring to FIG. 3, when reverse data is generated in a terminal performing a discontinuous reception operation (305), the terminal requests transmission resource allocation by reporting a buffer status to the base station (310). The activation period, which operates in an activated state, is started 315. Starting the activation period is equivalent to stopping the discontinuous receiving operation.

The terminal monitors the forward control channel and transmits reverse data using the transmission resource when the transmission resource is allocated. When the transmission resource is allocated, the terminal transmits data to the allocated transmission resource and transmits the last data stored in the transmission buffer.

In this case, if the last data satisfies one of the following two conditions of discontinuous reception triggering, the UE informs the MAC PDU containing the last data of 'discontinuous reception operation resume' control information (hereinafter 'DRX RESUME' And store together and transmit (345). Thereafter, when transmission of the MAC PDU is completed, the discontinuous reception operation is resumed (350). That is, the activation period ends and transitions to the sleep state.

[DRX RESUME triggering condition]

[1] When all other logical channel transmit buffers are empty, the last data stored in the transmit buffer of the logical channel to which no ARQ is applied is transmitted.

[2] A reception status report message, in which information for requesting retransmission is not received, that is, a reception status report message containing only a positive acknowledgment signal is transmitted as the last data, and data in which poll information has been previously received of the last data is not transmitted. Or the reception status report message which is a response to this even if the data containing the poll information has been transmitted.

On the other hand, when the terminal transmits the last data stored in the transmission buffer, if the last data does not satisfy the [DRX RESUME triggering condition], the terminal completes the transmission of the MAC PDU containing the last data (320) In operation 325, the timer is driven for t time.

If no data is received in the forward direction until the t timer expires, the activation period ends and the system transitions to the sleep state (335).

At this time, if data is received in the forward direction before the t timer expires, the terminal maintains the activation period until the base station commands the end of the activation period or until no data is received for another predetermined period.

As described above, according to an embodiment of the present invention, after the terminal notifies the network of control information on whether to operate in the discontinuous reception mode again in transmitting the last reverse data, the terminal maintains an activation state and according to discontinuous reception. Activate sleep state.

4 illustrates a terminal device for controlling a DRX mode according to an embodiment of the present invention.

Referring to FIG. 4, the terminal is composed of a transmission / reception block 435, a MAC block 425, an RLC block 405, 410, and 415, an RRC block 420, and a discontinuous reception control block 430.

One RLC block (405, 410, 415) is made per service, it is responsible for reconfiguring the packet generated in the upper layer to a size suitable for transmitting over the radio channel, and if necessary apply ARQ.

A radio link control packet data unit (RLC PDU) transfers data transmitted from the RLC blocks 405, 410, and 415 to the MAC block 425 or from the MAC block 425 to the RLC blocks 405, 410, and 415. ).

The MAC block 425 multiplexes the packets configured in the RLC blocks 405, 410, and 415 to MAC PDUs and transmits them through the transmit / receive block, or demultiplex the RLC PDUs from the MAC PDU received through the transmit / receive block to appropriate RLC block. It is responsible for delivering to the network.

Since the connection interface between the RLC blocks 405, 410, and 415 and the MAC block 425 is called a logical channel, the MAC block 425 is responsible for delivering RLC PDUs demultiplexed in the MAC PDU to an appropriate logical channel. .

The transmission / reception block 435 is responsible for the transmission and reception of the reverse data generated through the physical channel.

The discontinuous reception control block 430 controls the discontinuous reception operation according to the discontinuous reception setting. That is, the transceiver 435 is turned on in the activation period and the transceiver 435 is turned off in the sleep period.

In other words, the discontinuous reception control block 430 sets the discontinuous reception according to the instruction of the RRC block 420 or according to the nature of the data generated in each of the RLC blocks 405, 410, and 415. Control device 435.

That is, when the RLC PDU transmitted in a specific RLC block is the last data and the data is the last data to which ARQ is not applied, the transmission / reception block 435 is turned off. Also, the transmission / reception block 435 may be turned off in the case where the information requesting retransmission is a reception status report message which is not stored.

The RRC block 420 controls the setting and release of various blocks related to wireless communication, such as the RLC blocks 405, 410, and 415, the MAC block 425, the transmit / receive block 435, and the discrete reception control block 430. .

5 is a signal flow diagram between a base station and a terminal in a variable discontinuous reception state according to the present invention.

Referring to FIG. 5, in step 515, the terminal 505 receives a SETUP message from a base station (or a device for managing radio resources in a network). The logical channels are set according to the setting information stored in the SETUP message to transition to the connected mode. That is, in the present invention, the terminal in the connected state in which the network and the logical channels are set as described above performs discontinuous reception.

The SETUP message includes configuration information of logical channels for providing a service desired by the terminal, for example, information related to various timers or variables used in an RLC block.

In addition, if the terminal performs the discontinuous reception operation, the discontinuous reception setting information is also included. For example, information such as start point information of a discontinuous reception period or information on a discontinuous reception period is included. In addition, the SETUP setting message stores a timer 1 value and a timer 2 value.

Accordingly, when the RRC block of the UE receives the SETUP message, the RRC block transmits the logical timer value and the discontinuous reception setting information to the discontinuous reception control block, and sets the logical channel according to the configuration information for each logical channel.

When the SETUP process ends, in step 520, the terminal and the base station performs a discontinuous reception operation according to the discontinuous reception setting information. In other words, the terminal wakes up at the set-up wake-up time with the base station, that is, transitions to the active state to determine whether to receive data.

On the other hand, in the activation state, if no data is received for a certain period or if the base station instructs to end the activation period, the activation period ends and transitions back to the sleep state. When the base station receives the forward data to be transmitted to the terminal, the base station stores the forward data until the activation period of the nearest terminal. When the activation period starts, forward data stored in the terminal is transmitted, and when the transmission of the forward data ends, the terminal is instructed to end the activation period.

In step 525, which is a random point in time, the terminal detects that reverse data to be transmitted to the base station is generated through the logical channel.

Accordingly, in step 530, the UE reports the buffer status for transmitting the reverse data to the scheduler of the base station. In other words. The terminal requests transmission resource allocation for reverse data transmission and transitions to an active state. In response to the buffer status report, the UE receives an allocation of transmission resources through a forward control channel and transmits reverse data through the allocated transmission resources.

In step 535, the terminal transmitting the reverse data checks whether the last data satisfies the [DRX RESUME triggering condition] before transmitting the last data. That is, it is checked whether the last reverse data is the last data in the transmission buffer of the logical channel to which ARQ is not applied, or a reception status report message in which information for requesting retransmission is not received. If the above conditions are met, the terminal stores and transmits control information called DRX RESUME in the MAC PDU containing the last data.

When the transmission of the MAC PDU is completed in step 540, the activation period ends and transitions to the sleep mode. In other words, resume the discontinuous reception operation.

On the other hand, if the last data does not satisfy the [DRX RESUME triggering condition] in step 535, the timer 1 is driven after completing the transmission of the MAC PDU containing the last data. Until the timer 1 expires, if the forward data is not scheduled from the base station, the terminal terminates the activation period, and goes back to sleep mode.

In addition, if the forward data is scheduled before the timer 1 expires, the terminal maintains an activation period until one of the following [terminal activation period termination conditions] is satisfied.

[Terminal Activation Period End Condition]

-No data is received during timer 2 after the most recently received data.

Command the base station to end the activation period

Here, the timer 1 is a timer that is driven and maintained in an active state for a maximum time to maintain power consumption of the terminal after the terminal transmits reverse data to the base station. In addition, timer 2 is a timer that is driven for a time set to maintain an active state for ACK / NACK transmission after receiving forward data from the base station. The timer 1 and the timer 2 is set to a value that can maintain the optimal terminal power by the system operator. In addition, the value of the timer 1 and the timer 2 is set differently, but the base station and the terminal may terminate the activation state at the same time point again to match the discontinuous reception time.

In response to the operation of the terminal, when the base station receives a buffer status report from the terminal performing the discontinuous reception operation, the base station recognizes that the discontinuous reception operation is stopped and remains active. In addition, according to the scheduler's decision, an appropriate transmission resource is allocated to the terminal, and when the MAC PDU containing the DRX RESUME is stored from the terminal, the terminal recognizes that the discontinuous reception operation is resumed.

On the other hand, even if the DRX RESUME does not receive the MAC PDU stored in the terminal, if the data is not received from the terminal for a predetermined period and there is no data to be transmitted to the terminal resumes the discontinuous reception operation.

The base station may explicitly instruct the resumption of the discontinuous reception operation by transmitting a MAC PDU containing control information informing the resumption of the discontinuous reception operation, and by not transmitting any data to the terminal for a predetermined period of time, You can also let yourself resume discontinuous reception.

FIG. 6 is a diagram illustrating an operation of an RLC block for controlling to maintain a variable activation state in a terminal device according to the present invention.

Referring to FIG. 6, in step 605, the RLC block is instructed to deliver data to the MAC block from a layer in charge of scheduling inside the terminal.

In step 610, the RLC block determines whether the received data is the last data stored in the transmission buffer. If the data is the last data, the RLC block proceeds to step 615. If the data is not the last data, the RLC block proceeds to step 630.

In step 630, the RLC block constructs an RLC PDU of a size required by the scheduler from the data stored in the transmission buffer and delivers the RLC PDU to the MAC layer, and waits until the scheduler issues the next command.

On the other hand, if the RLC block confirming that the data is the last data does not perform the ARQ process on the data in step 615, that is, if it is operating in the RLC unacknowledged mode (UM), the process proceeds to step 625.

On the other hand, if the ARQ process is performed on the transmission data, the process proceeds to step 620. In step 620, the RLC block checks whether the last data satisfies the following [Indicator 1 triggering condition].

[Indicator 1 triggering condition]

-Status report message not containing resend request

-There is no poll that does not receive a response. In other words, the RLC PDU containing the poll has never been transmitted or has already received the reception status report message.

If all of the above conditions are satisfied, the process proceeds to step 625. If none of the conditions are satisfied, the process proceeds to step 635.

In step 625, the RLC block configures an RLC PDU with the last data, and delivers the RLC PDU to the lower layer together with the indicator 1. Indicator 1 indicates that the RLC PDUs delivered together are the last data satisfying the [DRX RESUME triggering condition]. That is, ARQ is not performed according to operation with RLC UM, which is data that does not cause reception of forward data. Therefore, the terminal transmits the last data together with the DRX RESUME and resumes the discontinuous reception operation when the transmission is completed.

On the other hand, in step 635, the RLC block configures an RLC PDU with the last data, and delivers the RLC PDU to the lower layer together with the indicator 2. Indicator 2 indicates that the RLC PDUs delivered together are the last data that do not satisfy the [DRX RESUME triggering condition]. This is a situation where it is considered necessary to receive data in the forward direction for a set timer. Therefore, the terminal transmits the last data, and upon completion of the transmission, determines a time point when the discontinuous reception operation is resumed by driving a predetermined timer.

7 is a diagram illustrating operations of a discontinuous reception control block and a MAC block according to the present invention.

Referring to FIG. 7, in operation 705, backward data is generated in an arbitrary logical channel transmission buffer of a terminal to which a discontinuous reception operation is applied.

The MAC block requests the scheduler to allocate transmission resources in step 710. In this case, the MAC block reports the buffer state of the data generated in the transmission buffer to the base station and requests allocation of transmission resources required for the data transmission. In operation 715, the discontinuous reception control block controls the transmission and reception block to start the activation interval.

If a transmission resource is allocated to the UE in step 720, in step 725, the scheduler of the MAC block instructs the RLC block to construct an RLC PDU having a size that can be transmitted using the allocated transmission resource and deliver it to the MAC block. When the RLC PDU arrives at the MAC block in step 730, the discontinuous receiving block checks whether indicator 1 is delivered with the RLC PDU in step 735.

In other words, it is checked if the RLC PDU is the last data and is a RLC UM data or a reception status report message that does not contain a retransmission request. That is, if the indicator 1 is delivered together, the process proceeds to step 740 and, if not, the process proceeds to step 750.

In step 740, the discontinuous receiving block controls the MAC block to receive and transmit control information called DRX RESUME to the MAC PDU containing the RLC PDU. The DRX RESUME control information may be implemented as a kind of control information of a MAC. For example, an indicator 810 indicating whether to receive DRX RESUME information is included in a MAC header, and if the DRX RESUME needs to be transmitted, the indicator Can be set to an appropriate value and the DRX RESUME 820 can be stored at the back of the MAC PDU.

When the base station receives the DRX RESUME control information, the base station recognizes that the discontinuous reception operation is resumed and does not allocate transmission resources or transmit data to the terminal until the next activation period.

In step 745, when the transmission of the MAC PDU is completed, the discontinuous reception control block controls the transmission / reception block to end the activation section and enter the sleep section. In other words, resume the discontinuous reception operation.

Meanwhile, in step 750, the discontinuous reception control block checks whether the RLC PDU is delivered with the indicator 2. The forwarding of the indicator 2 together means that the RLC PDU is the last RLC PDU, but since there may be data reception from the base station after transmitting the RLC PDU, the discontinuous reception operation should not be immediately resumed. Accordingly, if the indicator 2 is transmitted together, the process proceeds to step 755. If the indicator 2 is not transmitted together, it means that there is still data to be transmitted in the RLC transmission buffer.

In step 755, the MAC block transmits a MAC PDU, and when the transmission of the MAC PDU is completed, the MAC block drives timer 1 and proceeds to step 760.

In step 760, if no forward data is received until timer 1 expires, the discontinuous receiving block proceeds to step 765 to end the activation period and resume the discontinuous receiving operation. On the other hand, if forward data is received before the timer 1 expires, the discontinuous reception block proceeds to step 770 to maintain the activation period until the activation termination condition is satisfied, and resumes the discontinuous reception operation when the activation termination condition is satisfied.

8 is a diagram illustrating the structure of a MAC PDU according to the present invention.

Referring to FIG. 8, the MAC block configures a MAC PDU by accommodating a MAC header 805 and control information 820 called DRX RESUME together in the RLC PDU received from the RLC block. In this case, the indicator 810 indicating whether the control information 820 called DRX RESUME may be further included. That is, setting the indicator to 1 indicates that the RLC PDU is information on a condition for triggering a DRX RESUME according to the present invention. On the other hand, the indicator is set to 2 indicates that the trigger triggers DRX RESUME after maintaining the activation state for a predetermined timer time.

<Example 2>

In the second embodiment of the present invention, in resuming the discontinuous reception operation temporarily suspended for the reverse data transmission by the terminal performing the discontinuous reception operation, the period of the discontinuous reception operation to be resumed is adjusted according to the nature of the last reverse data. How to do it.

9 illustrates the operation of a terminal according to the second embodiment of the present invention.

Referring to FIG. 9, in operation 905, backward data is generated in an arbitrary logical channel transmission buffer of a terminal to which a discontinuous reception operation is applied.

In step 910, the terminal requests the scheduler of the base station to allocate a transmission resource for reporting the status of the transmission buffer. In more detail, through the process of the following three steps, the terminal reports the buffer status for the data generated in the transmission buffer to the base station and requests the allocation of transmission resources required for the data transmission.

The transmission resource allocation request process may be performed in three steps as follows. When the UE starts the transmission resource allocation request process, that is, transmits a transmission resource allocation signal to a base station through a predetermined physical channel, the discontinuous reception operation is immediately stopped and activated. Start the segment.

<Transfer resource allocation request process>

1. A terminal requests a base station to allocate a transmission resource for reporting a buffer status through a predetermined physical channel

2. The base station allocates transmission resources for reporting the buffer status to the terminal

3. The terminal reports the buffer status by using the allocated transmission resource

When the terminal starts the transmission resource allocation request process as described above, that is, transmits the transmission resource allocation signal to the base station through a predetermined physical channel, in step 915, the discontinuous reception operation is immediately stopped and the activation period starts.

The terminal, which has stopped the discontinuous reception operation, monitors a predetermined forward control channel and transmits reverse data when a transmission resource is allocated to the terminal through the forward control channel.

The terminal repeats the operation of transmitting data using the allocated transmission resource until the transmission of the last data is completed.

In step 920, if the terminal has finished transmitting the last data and the base station determines that the data is the last data, the terminal proceeds to step 925.

Although not shown in the figure, when there is no data to be transmitted, the terminal transmits reverse data by adding padding which is meaningless data. Therefore, when the terminal transmits the last data, if the amount of the allocated transmission resource is larger than the last data, by inserting padding in the last data, it indirectly indicates to the base station that there is no more data to transmit. In this way, when the padding is added to the last data to indicate that the base station is empty of the transmission buffer, the terminal transmits the last data immediately proceeds to step 925.

On the other hand, in transmitting the last data. If the amount of allocated transmission resources exactly matches the last data, the terminal cannot indicate to the base station that there is no data to transmit anymore, and the base station is likely to allocate the transmission resources to the terminal later. Therefore, even if the terminal transmits the last data, if the padding or the information indicating the last data has not been inserted into the last data, the terminal does not proceed to step 925 and maintains the activation period. In step 925, the transmission resource is allocated to transmit the information indicating that there is no data to be transmitted to the base station.

In step 925, the terminal determines the nature of the last data to determine which discontinuous reception period to apply.

If the last data is data generated in a logical channel to which ARQ is not applied, or data generated in a logical channel to which ARQ is applied, the terminal proceeds to step 935 if the data is a reception status report message in which information for requesting retransmission is not received. If no, go to step 930.

In step 930, the UE resumes the discontinuous reception operation and applies a predetermined first discontinuous reception period as the discontinuous reception period of the discontinuous reception operation. In step 935, the UE resumes the discontinuous reception operation and applies a predetermined second discontinuous reception period as the discontinuous reception period of the discontinuous reception operation.

The base station signals the first discontinuous receiving period and the second discontinuous receiving period to the terminal in a call setup process, and the first discontinuous receiving period has a smaller value than the second discontinuous receiving period.

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.

1 is a view for explaining the concept of a discontinuous reception operation.

2 is a diagram illustrating the effect of reverse data generated on a terminal in a discontinuous reception operation on a discontinuous reception operation;

3 is a view illustrating the entire operation of discontinuous reception of a terminal processing reverse data according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a terminal device according to an exemplary embodiment of the present invention.

5 is a diagram illustrating a signaling flow and processing operations of a terminal and a base station according to an exemplary embodiment of the present invention.

6 is a view for explaining the operation of the RLC block of the terminal according to an embodiment of the present invention.

7 is a view for explaining the operation of the MAC block and the discontinuous reception operation control block of the terminal according to an embodiment of the present invention.

8 illustrates a structure of a MAC PDU according to the present invention.

9 is a view for explaining the operation of the terminal according to an embodiment of the present invention.

Claims (5)

In the method for discontinuous receiving terminal transmits reverse data in a mobile communication system, Receiving a radio resource control connection establishment message including a discontinuous reception start time and a discontinuous reception period from a base station and establishing a connection; Maintaining a sleep state with the discontinuous reception period at the start of discontinuous reception; Detecting the occurrence of reverse data and transitioning to an active state, Transmitting reverse data including control information indicating transition to a sleep state according to whether forward data corresponding to the reverse data is received; Transmitting the reverse data, and then transitioning to and maintaining a sleep state. The method of claim 1, wherein the terminal, If the forward data is not received corresponding to the reverse data according to the nature of the reverse data, transmitting reverse data including control information indicating that the forward data is not received, and then transitioning to a sleep state. Reverse data transmission method characterized in that. The method of claim 1, wherein the terminal, When receiving forward data corresponding to the reverse data according to the nature of the reverse data, after transmitting reverse data including control information indicating that the forward data is received, the active state is maintained for a predetermined timer time, and then The method of claim 1, further comprising transitioning to a sleep state. A terminal device for transmitting reverse data, At least one radio link control (RLC) block for receiving data received from an upper layer and reconstructing a packet of a predetermined transmission unit; A medium access control (MAC) block for checking and multiplexing a retransmission for a packet of a transmission unit received from the RLC block; Discontinuous reception control for controlling a transmission / reception apparatus to have a discontinuous reception period different from a predetermined discontinuous reception period at a predetermined discontinuity start time point with a network in consideration of whether or not a packet of a transmission unit received from the RLC block is retransmitted. Reverse data transmission terminal device characterized in that it comprises a block. In the method for discontinuous receiving terminal transmits reverse data in a mobile communication system, In response to generation of reverse data, transmitting a resource allocation request signal to a scheduler of a base station and starting an activation period; When a transmission resource is allocated, transmitting data using the allocated transmission resource until the completion of the last data transmission, and And determining a discontinuous reception period according to the last data type.

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