WO2010054535A1

WO2010054535A1 - Control method for receiving downlink data in the mobile communication terminal and mobile communication terminal

Info

Publication number: WO2010054535A1
Application number: PCT/CN2009/001260
Authority: WO
Inventors: 谢芳; 胡臻平; 崔春风
Original assignee: 中国移动通信集团公司
Priority date: 2008-11-14
Filing date: 2009-11-13
Publication date: 2010-05-20
Also published as: CN101742532A; CN101742532B

Abstract

The present invention provides a control method receiving downlink data in the mobile communication terminal and a mobile communication terminal, the method uses the third timer to monitor the time difference between the earliest arrival time of the data retransmitted again and the latest arrival time of the data retransmitted firstly, and while the third timer is expired, the receiver is turned on and the data retransmitted again is waited to receive, and the fourth timer is started at the same time, so the difference value between the earliest arrival time and the latest arrival time of the data retransmitted again is monitored, thereby it can determine whether turns off the receiver in time while the fourth time is expired. The application of the present invention embodiment can ensure that the receiver maintains opening status during the time cycle that the data retransmitted again is possible arrived, and improve the success rate of retransmission data reception.

Description

Control method for mobile communication terminal receiving downlink data and mobile communication terminal

The present invention relates to mobile communication technologies, and in particular, to a method for controlling downlink mobile terminal receiving downlink data and a mobile communication terminal. Background technique

The Discontinuous Reception (DRX) function allows the user equipment (User Equipment: UE) to shut down the receiver under certain conditions without constantly listening to the Physical Downlink Control Channel (PDCCH). The purpose of the electricity.

The basic principle of DR is as shown in Figure 1. The DR period consists of the continuous PDCCH listening phase (On Duration) and the possible sleep phase (Opportunity for DRX). The units of the On Duration phase and the Opportunity for DRX phase are subframes. number. During the On Duration phase, the UE must continuously listen to each of the PDCCH-containing subframes to obtain the resource allocation indication of the uplink and downlink transmissions of each subframe, and determine the uplink and downlink allocations that the base station allocates to itself according to the resource allocation indication of each subframe. Frequency resources, and data processing on the allocated time-frequency resources. The UE may not need to continuously listen to the PDCCH during the Opportunity for DRX phase.

In the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) system, in order to save the battery consumption of the UE when there is no data to be transmitted and received, the UE may perform a DRX operation, that is, temporarily turn off the reception. And waking up to monitor the corresponding PDCCH at a time agreed with the base station, so as to know whether the base station needs to send data to the UE during the sleep period. The DR operation includes some set parameters and some control timers. For example, the included parameters include a DRX cycle, and the included timer has an On Duration Timer and a DRX inactivity timer. (DRX Inactivity Timer) and so on. The UE monitors the PDCCH in the On Duration period. If the data indication sent by the base station to the base station is not monitored, the sleep state is performed after the On Duration Timer expires. If UE is on On Duration The DRX Inactivity Timer is started when the monitoring PDCCH is informed that there is a data indication sent to itself, and if the PDCCH again indicates that data is transmitted to the user before the DRX Inactivity Timer expires, the DRX Inactivity Timer will be restarted; Both the DRX Inactivity Timer timer and the On Duration timer expire, and the UE can enter the sleep phase. Therefore, the UE's On Duration in the DR cycle remains active (Active), while in the Opportunity for DRX phase it may be active or in a dormant state.

In the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) system, DRX control and Hybrid Automatic Repeat Request (HARQ) are independently operated, that is, in HARQ. When the downlink data retransmission is required, the evolved user equipment (eUE) in the LTE system will start the receiver to listen to the PDCCH according to the set HARQ RTT (round Trip Time) Timer regardless of the current DRX operation status, in preparation for receiving the downlink. Retransmit the data. In addition, HARQ retransmissions will not further affect normal DRX operations. And because the LTE downlink adopts asynchronous HARQ, the existing LTE R8 also defines a DRX Retransmission Timer timer related to the downlink HARQ data transmission control, so that the eUE can resume to sleep when it does not receive the retransmitted data within a certain period of time. Status, turn off the receiver.

The following is an example of determining that the evolved base station (eNB) in the LTE system allocates downlink data transmission resources for the eUE in the subframe by using the resource allocation indication of the PDCCH in the subframe of the On Duration. In LTE Release 8 (Release 8), the eUE performs the coordinated control process of DRX and downlink HARQ.

As shown in Figure 2, taking a DRX cycle as an example, the DRX cycle is 20 subframes, where: the On Duration phase is two subframes, and the DRX Inactivity Timer is two subframes. The existing standard specifies one subframe. The length is lms. If the eUE listens to the downlink data sent to itself in the first subframe of the On Duration phase, the receiving control process of the downlink data specifically includes the following steps:

S201: The eUE starts a first timer, a HARQ RTT (Round Trip Time) Timer timer, and processes downlink data in a first subframe of the current DRX cycle. At the same time, the eUE starts the DRX Inactivity Timer;

5202. The eUE determines whether the data is correctly received. If the data is received correctly, the eUE feeds back an ACK (Acknowledgement) to the eNB. If the downlink data is not received correctly, the eUE feeds back the NACK to the eNB.

( Negative Acknowledgement );

The purpose of the HARQ RTT Timer is to determine the minimum time interval before the possible retransmission data arrives. The length of the HARQ RTT Timer timer can only be less than or equal to the minimum time interval to ensure that the receiver is turned on when the retransmission arrives. . In the prior art, the eUE receives and processes the downlink data, which generally takes 4 ms, that is, the fourth subframe after the first subframe of the current DRX cycle may feed back ACK or NACK to the eNB, and the ACK or NACK arrives at the eNB for transmission delay and the eNB. The sum of time for demodulating ACK or NACK is generally 4ms. Thus, even if the eNB demodulates the NACK and immediately schedules retransmission of data, the retransmitted data will be sent to the eUE in the 8th subframe after the first subframe. Therefore, when setting the length of the HARQ RTT Time timer, the minimum time interval is generally set to 8ms, thereby ensuring that the receiver is turned on before retransmission of data to ensure that the retransmitted data can be received.

5203. When the HARQ RTT timer expires and the downlink data is not correctly received, that is, the eUE feeds back the NACK to the eNB, the eUE turns on the receiver, ends the sleep state, enters the receiving state, and starts another timer DRX Retransmission Timer.

The DRX Retransmission Timer is started to monitor the waiting time for receiving retransmission data. When the eNB does not demodulate the NACK into an ACK and then does not retransmit the data, the eUE waits indefinitely. The length depends on the required maximum waiting time. It is determined that the eNB is configured to the eUE through a Radio Resource Control (RRC) procedure. During the operation of the DRX Retransmission Timer, if the eUE correctly receives the retransmitted data, the receiver turns off the receiver and enters the sleep state after receiving the data. When the DRX Retransmission Timer is set to receive no retransmission data, the eUE does not. Wait again, turn off the receiver, and go to sleep.

If the eUE does not detect the downlink data indication sent to itself on the PDCCH during the On Duration phase, the UE turns off the receiver after the On Duration ends, and enters the sleep phase; if the UE monitors the PDCCH within the On Duration, it is sent to itself. When the data is indicated, it starts The DRX Inactivity Timer, if the PDCCH again indicates that data is transmitted to the user before the DRX Inactivity Timer expires, the DRX Inactivity Timer will be restarted; only when the DRX Inactivity Timer and the On Duration timer expire, the UE In order to enter the sleep phase. When the eUE fails to correctly receive downlink data, the eUE also needs to open the receiver after the HARQ RTT Timer expires, and the maximum time that is turned on is equal to the duration of the DRX Retransmission Timer.

However, if the PDCCH that indicates the downlink retransmission data transmission is lost, and the DRX Retransmission Timer does not receive the retransmission data, the eUE cannot receive the retransmission scheduled by the eNB for the eUE if it enters the sleep state.

As shown in FIG. 3, when the downlink data indication is detected by the TO time, the HARQ RTT timer is started, and the DRX Retransmission Timer is started after the HARQ RTT Timer expires. If the downlink data is not correctly received, the eUE feeds back the NACK to the eNB at the time T1. . The eNB schedules the retransmission data of the eUE according to the NACK, and sets the PDCCH of the first retransmission indication to occur at the T2 time and the T4 time. If the PDCCH of the first retransmission indication is lost, the eUE does not feed back the correct reception downlink to the eNB. The ACK of the data is retransmitted; if the maximum number of retransmissions has not been reached at this time, the eNB again resends the retransmission data to the eUE after the length of the HARQ RTT Timer after the last PDCCH. Corresponding to the first retransmission PDCCH that may occur at the earliest possible time, T2, the retransmission is first appeared at time T3: T3=T2+HARQ RTT Timer, the latest occurs at time Τ5, T5=T2+HARQ RTT Timer+DRX Retransmission Timer =T3+ DRX Retransmission Timer. Corresponding to the first retransmission PDCCH that may occur at the time of T4, the retransmission is first appeared at time T5, T5=T4+HARQ RTT Timer, and the latest occurs at time Τ6, T6=T4+HARQ RTT Timer+DRX Retransmission Timer=T5+DRX Retransmission Timer. In fact, the retransmission data may arrive at any time from T3 to Τ6. If the eUE enters the sleep state after the end of T4 according to the DRX Retransmission Timer, the retransmission data that appears in Τ4~Τ6 will be missed. Summary of the invention

Embodiments of the present invention provide a downlink data receiving control method and a mobile communication terminal, which are used to provide High success rate of receiving retransmitted data.

A method for controlling downlink data reception by a first mobile communication terminal according to an embodiment of the present invention includes:

Not receiving the first retransmission data when the second timer for monitoring the first retransmission data waiting time expires, and determining that the second timer length is less than the first retransmission data arrival time for monitoring the downlink data When a timer is length, the receiver is turned off and a third timer for monitoring the earliest arrival time of the data to be retransmitted again is started;

When the third timer expires, the receiver is turned on to wait for receiving data for retransmission, and a fourth timer for monitoring the retransmission data waiting time is started.

Further, when the first timer fails to receive the first retransmission data, and further determines that the second timer length is not less than the first timer length, the fifth timer is started to wait for receiving the retransmission again. data.

Preferably, when the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, the receiver is turned on, and a second timer for monitoring the first retransmission data waiting time is started.

Preferably, the first timer is started when a downlink data transmission indication is received during a listening phase of discontinuous reception.

Or the first timer is started after determining that the downlink data is not correctly received by the base station when the downlink data is not correctly received.

Preferably, the length of the first timer is less than or equal to a minimum time interval between the start time of the first timer and the arrival time of the first retransmission data;

The length of the third timer is the difference between the length of the first timer minus the length of the second timer; the length of the fourth timer is twice the length of the second timer.

Preferably, the length of the fifth timer is the sum of the length of the first timer plus the length of the second timer.

And, when the start time of the first timer and the sending time of the incorrectly received indication information are the same, the minimum time interval is: the incorrectly received indication information is in the mobile communication terminal and a transmission delay transmitted between the base stations, plus a sum obtained by the base station after processing the time required to correctly receive the indication information;

When the start time of the first timer is earlier than the sending time of the indication information, the minimum time interval is: the transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station, And a sum obtained after the base station processes the time required for the incorrect reception of the indication information and the time difference between the timer start time and the time when the indication information is not correctly received;

When the start time of the first timer is later than the sending time of the indication information that is not correctly received, the minimum time interval is: the transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station, The value obtained by the time when the base station processes the time required to correctly receive the indication information, and subtracts the time difference between the timer start time and the time when the indication information transmission time is not correctly received.

Preferably, the control method further includes: when determining that the downlink data is correctly received, returning the correct receiving indication information to the base station.

A method for controlling downlink data reception by a second mobile communication terminal according to an embodiment of the present invention includes:

When the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, if the receiver is in the off state, the receiver is turned on, and a second timer for monitoring the retransmission data waiting time is started. The length of the first timer is less than or equal to a minimum time interval between the first timer start time and the first retransmission data arrival time, where the first timer length is greater than the second timer length;

Not receiving the retransmission data when the second timer expires, the receiver is turned off, and the third timer is started, where the length of the third timer is the difference between the length of the first timer minus the length of the second timer. When the third timer expires, the receiver is turned on to wait for receiving data that is retransmitted again, and a fourth timer for monitoring the duration of the continuous opening of the receiver is started, and the length of the fourth timer is the second timing. The length of the device is twice.

The first mobile communication terminal provided by the embodiment of the present invention includes:

Not receiving retransmission when the second timer that monitors the first retransmission data waiting time expires Data, and determining that the second timer length is less than a first timer length for monitoring the first retransmission data arrival time of the downlink data, turning off the receiver and starting a third for monitoring the earliest arrival time of the retransmitted data again The unit of the timer;

And means for turning on the receiver to wait for receiving data for retransmission when the third timer expires, and starting a unit for monitoring a fourth timer for retransmitting the data waiting time.

Further, the mobile communication terminal further includes:

And when the first timer is not received when the second timer expires, and further determining that the second timer length is not less than the first timer length, starting the fifth timer to wait for receiving the retransmission again The unit of data.

Further, the mobile communication terminal further includes:

When the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, the receiver is turned on, and the unit of the second timer for monitoring the first retransmission data waiting time is started.

The first timer is started when the downlink data transmission indication is received in the listening phase of the discontinuous reception; or the first timer determines to send the downlink to the base station when the downlink data is not correctly received. The data was started after the data was not received correctly.

The length of the first timer is less than or equal to a minimum time interval between the start time of the first timer and the arrival time of the first retransmission data;

The length of the fifth timer is the sum of the length of the first timer plus the length of the second timer. A second mobile communication terminal provided by the embodiment of the present invention includes:

When the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, if the receiver is in the off state, the receiver is turned on, and the unit for monitoring the second timer of the retransmission data waiting time is started. The length of the first timer is less than or equal to a minimum time interval between the first timer start time and the first retransmission data arrival time, where the first timer length is greater than the second timer length; a unit for not receiving retransmission data when the second timer expires to turn off the receiver and start a third timer, where the length of the third timer is the first timer length minus the second timer The difference in length;

And a unit for turning on a receiver to wait for receiving retransmission when the third timer expires, and starting a unit for monitoring a fourth timer of a continuous open duration of the receiver, where the length of the fourth timer is The second timer is twice the length.

In summary, the downlink data receiving control method and the mobile communication terminal provided by the embodiment of the present invention use the third timer to monitor the time difference between the earliest arrival time of the retransmitted data and the latest arrival time of the first retransmission data, and When the third timer expires, the receiver is turned on to wait for the data to be retransmitted again, and the fourth timer is started at the same time to monitor the difference between the earliest arrival time and the latest arrival time of the data to be retransmitted again. It is possible to decide whether to turn off the receiver in time when the fourth timer expires. It ensures that the receiver remains open during the period when the retransmission data can be reached again, which improves the success rate of receiving retransmitted data. DRAWINGS

1 is a schematic diagram of a principle of a DRX control mechanism of an existing mobile communication terminal;

FIG. 2 and FIG. 3 are respectively schematic diagrams of the downlink data receiving control principle of the existing mobile communication terminal; FIG. 4, FIG. 5 and FIG. 6 are respectively schematic diagrams of the downlink data receiving control principle of the mobile communication terminal according to an embodiment of the present invention. detailed description

As shown in FIG. 4, in the embodiment of the present invention, to improve the success rate of receiving retransmission data, when the length of the DRX Retransmission Timer is less than the length of the HARQ RTT Timer, that is, the time T3 occurs after the time T4, the following technical solutions are provided:

Step S401: The eUE starts the first timer HARQ RTT Timer when the downlink data indication is monitored at the time of the TO;

The HARQ RTT Timer is used to monitor the first retransmission data arrival time of downlink data. The length of the HARQ RTT Timer timer should be less than or equal to the minimum time interval between the start time of the timer and the arrival of the first retransmission data.

Step S402: The HARQ RTT Timer expires at time T2. If the eUE is in hibernation when the HARQ RTT Timer expires, the receiver is turned off, the receiver is turned on, and the second timer is started: DRX Retransmission Timer Timing The eUE keeps the receiver open and starts the DRX Retransmission Timer timer if the receiver is already on when the HARQ RTT Timer expires;

The DRX Retransmission Timer is used to monitor the retransmission data waiting time. The length should be the difference between the latest arrival time and the earliest arrival time of the first retransmission data, that is, T4 minus T2.

Step S403: The DRX Retransmission Timer expires at time T4, and when the Retransmission Timer expires, the eUE turns off the receiver to enter the sleep state and starts a third timer if the retransmission data is not received, Timer X;

The Timer X timer is used to monitor the time difference between the earliest arrival time of the retransmitted data and the latest arrival time of the first retransmission data. The length is T3 minus T4, which is equal to the length of the HARQ RTT Timer timer minus the DRX Retransmission Timer timing. The length of the device.

Step S404, when the Timer X timer expires, the eUE must open the receiver to wait for receiving data for retransmission, and simultaneously start the fourth timer Timer Y;

The Timer Y timer is used to monitor the duration of the continuous open time of the receiver to receive the data again. The duration of the continuous open time of the receiver should be the difference between the earliest arrival time and the latest arrival time of the data again. The length is T6 minus Go to T3, which is equal to twice the length of the DRX Retransmission Timer.

In this way, when receiving the retransmission data during the operation of the Timer Y timer, the eUE can turn off the receiver when there is no other related timer running, or when the Timer Y timer expires, the data is still not retransmitted. The eUE can also turn off the receiver when no other related timers are running. Therefore, it is ensured that the receiver is in an open state during T3~T6, and can receive retransmission data that may occur again, and the receiver is turned off during the period of no retransmission of data during Τ4~3, saving eUE. Electricity. In the above embodiment, if the length of the DRX Retransmission Timer is less than the length of the HARQ RTT Timer, the eUE may directly start the third timer Timer X in step S403. If the length of the DRX Retransmission Timer is not limited, the length of the DRX Retransmission Timer must be less than the HARQ RTT. The length of the Timer needs to be determined after the length of the DRX Retransmission Timer is less than the length of the HARQ RTT Timer, and then the third timer, Timer X, is started. Otherwise, the third timer is not started, but the fifth timer is started. The specific technical solutions are as follows.

As shown in FIG. 5, when the length of the DRX Retransmission Timer is not less than the length of the HARQ RTT Timer, that is, after the time T3 occurs, the eUE keeps the receiver open and starts the fifth timing after the DRX Retransmission Timer expires. The NEW Timer timer has a length of the sum of the HARQ RTT Timer and the DRX Retransmission Timer, so that the eUE receiver can be turned on during the T4~Τ6 phase, waiting to receive the retransmission data that may occur again.

In the embodiment shown in FIG. 4 and FIG. 5, the minimum time interval for setting the length of the HARQ RTT Timer timer includes the sum of the following three parts: eUE receives the time required to process the downlink data, and the ACK or NACK sent by the eUE to the eNB Transmission delay, and the time required for the eNB to demodulate and process the ACK or NACK. Generally, the eUE receives and processes the downlink data, which generally takes 4 ms, that is, the 4th subframe after the first subframe of the current DRX cycle, and the T1 may feed back the ACK or NACK to the eNB, and the transmission delay of the ACK or NACK to the eNB. The sum of time for the eNB to demodulate the ACK or the NACK is generally 4 ms. Thus, even if the eNB demodulates the NACK and immediately schedules the retransmission of data, the retransmitted data is sent to the 8th subframe after the first subframe as soon as possible. eUE, therefore, when setting the length of the HARQ RTT Time timer, the minimum time interval is generally set to 8ms.

Considering that the eUE correctly receives the downlink data and feeds back the ACK to the eNB, no downlink retransmission data arrives. Therefore, in order to further reduce the power loss of the eUE, the embodiment of the present invention further provides the following improvement scheme, after the eUE feeds back the NACK to the eNB, The HARQ RTT Timer timer that controls the retransmission data reception is started, which avoids the timer start after receiving the downlink data correctly, thereby saving the power consumption of the eUE. As shown in Figure 6, the following steps are included:

Step S601: The eUE receives the processed downlink data at the TO time, and determines whether the data is correctly received. Step S602: If correctly received, the eUE feeds back an ACK to the eNB at time T1; According to the eNB, the eeNB feeds back the NACK to the eNB at the time of the T1, and starts the timer for the corresponding HARQ process, which is referred to as an eNB processing delay timer (eNB Processing Timer) in the embodiment of the present invention;

Step S603: When the eNB Processing Timer expires, if the eUE is in sleep, the receiver is in the off state, the eUE turns on the receiver to end the sleep state, enters the receiving state of the retransmission data, and starts the DRX Retransmission Timer.

Step S604, the DRX Retransmission Timer timer expires at time T4, and when the DRX Retransmission Timer expires, the eUE turns off the receiver to enter a sleep state and starts a third timer, Timer X;

Step S605: When the Timer X timer expires, the eUE must open the receiver to wait for receiving data for retransmission, and simultaneously start the fourth timer Timer Y.

The Timer Υ timer is used to monitor the duration of the receiver's continuous open time for receiving retransmitted data. The maximum duration of the receiver's continuous open time should be the difference between the earliest arrival time and the latest arrival time of the data again. The length is Τ6. Subtract Τ3, which is equal to twice the DRX Retransmission Timer.

The eNB Processing Timer timer is still used to monitor the minimum time interval before the retransmission data arrives. The length of the eNB processing delay timer must be less than or equal to the minimum time interval to ensure that the receiver is turned on before the retransmission data arrives. When the eNB processes the expiration of the delay timer, if the eUE is in the dormant state, the eUE needs to open the receiver to end the sleep state, and wait until the retransmission data is received.

The eeNB starts the eNB Processing Timer timer and the time is the same as the time for sending the NACK, for example, the same subframe or the same millisecond (ms), or different, as long as the length of the timer is less than or equal to: eNB Processing Timer timer start time and The retransmission data of the downlink data may reach the time interval between the earliest times. Retransmission of data earliest possible arrival time and eNB The interval between the start times of the Processing Timer timers is the minimum time interval before the retransmission data arrives. The eNB Processing Timer timer must expire before the retransmission data arrives or just arrives, triggering the eUE to turn on the receiver.

When the start time of the eNB Processing Timer timer is the same as the transmission time of the NACK, the minimum time interval is exactly: the transmission delay of the indication information NACK transmitted between the mobile communication terminal and the base station is not correctly received, and the base station needs to process the NACK. The sum obtained after time. When the start time of the eNB Processing Timer timer is earlier than the transmission time of the NACK, the time difference between the eNB Processing Timer timer start time and the NACK transmission time should be added to the minimum time. Otherwise, when the eNB Processing Timer timer is started. When the time is later than the transmission time of the NACK, the minimum time should be the value obtained by subtracting the time difference between the eNB Processing Timer timer start time and the NACK transmission time.

The following is a detailed description of the preferred embodiment of the eNB Processing Timer timer and the NACK transmission time.

The eUE receives the retransmission data during the operation of the DRX Retransmission Timer, and then closes the receiver to enter the sleep state after receiving the retransmitted data, or does not receive the retransmission data during the operation of the DRX Retransmission Timer. After the DRX Retransmission Timer timer expires, the receiver is turned off and goes to sleep again. Of course, if the DRX Inactivity Timer has not expired when the DRX Retransmission Timer expires, the eUE needs to shut down the receiver and enter the sleep state again when the DRX Inactivity Timer expires.

In this way, when the eUE receives the downlink data and determines that the data is correctly received, since the later data retransmission does not occur, the eNB does not start the delay timer, thereby reducing the number of timer starts and avoiding additional power. Consumption. Especially in an environment with good communication conditions, the probability of data retransmission is very low, and the power consumption of the eUE is greatly saved.

As shown in FIG. 4, the minimum time interval for setting the length of the HARQ RTT Timer timer includes the following three parts: the eeNB receives the time required to process the downlink data, the transmission delay of the ACK or NACK sent by the eUE to the eNB, and the eNB. When demodulating and processing ACK or NACK Between. As shown in FIG. 6, the minimum time interval for setting the length of the corresponding eNB Processing Timer in the embodiment of the present invention only needs to consider the transmission delay of the NACK sent by the eUE to the eNB and the time required for the eNB to demodulate the NACK. The sum of the two parts of time is substantially equal to the time required for the eUE to receive the processed downlink data, so the maximum duration of the eNB processing delay timer is set according to the sum of the transmission delay of the ACK or NACK and the time required for the eNB to demodulate the ACK or NACK. For example, 4ms, thereby further reducing the running time of the first timer, thereby further saving the power loss of the eUE. Of course, the duration of the eNB Processing Timer timer may also be set to 3 ms or 2 ms.

The basis of the above analysis is that after determining that the downlink data is not correctly received, the eUE can obtain an uplink resource that sends ACK or NACK feedback information to the eNB, thereby successfully transmitting ACK or NACK feedback information, according to the duplex mode of the FDD system, in the FDD system. There is no problem in the TDD system. However, since there are 7 different uplink and downlink time slot ratios in the TDD system, after the eUE determines that the downlink data is not correctly received, there may be no uplink resources available immediately for feedback ACK or NACK. This causes the length of the DRX Retransmission Timer to be set long enough to ensure that the eNB schedules the retransmission of the eUE during the DRX Retransmission Timer. Therefore, in the prior art, for the TDD system, it must be considered that the eUE is not likely to receive retransmission data for a certain period of time after the receiver is turned on, which causes unnecessary power consumption. At the same time, this also means that the eNB must schedule the downlink retransmission data sent to the eUE within the remaining time of the DRX Retransmission Timer, which will reduce the flexibility of the eNB scheduling and cause the eUE to not use the smaller DRX Retransmission Timer. Lms, 2ms, etc., and must use larger values such as 16ms, 24ms, 33ms, etc., which further reduces the power saving function of the DRX mechanism. After the technical solution provided by the embodiment of the present invention is used, in the TDD system, the start time of the eNB Processing Timer timer is the time for sending the NACK, so the downlink transmission caused by the eNB Processing Timer timer and the corresponding uplink ACK or The difference in delay between the NACK feedback information only needs to consider the transmission delay of the NACK sent by the eUE to the eNB and the time required for the eNB to demodulate the NACK, thereby further reducing the running time of the first timer and improving in the TDD system. eNB scheduling The flexibility to retransmit data.

It should be noted that, in all the foregoing embodiments, after the eUE determines that the data is correctly received, the eeNB may not feed back any information to the eNB, and only feed back the NACK to the eNB when the eNB does not receive the correct information, so that the eNB does not receive any feedback information of the eUE. The data has been received correctly and the data is retransmitted when a NACK is received.

In the embodiment of the present invention, the technical solution is described in detail by taking the receiving control of one downlink data as an example. In fact, the receiving control process of each downlink data is completely the same.

The embodiment of the present invention further provides a first mobile communication terminal, including:

When the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, if the receiver is in the off state, the receiver is turned on, and the second timer for monitoring the waiting time of the first retransmission data is started. Unit, the length of the first timer is less than or equal to a minimum time interval between the first timer start time and the first retransmission data arrival time;

The unit is configured to: when the second timer expires, when the second timer expires, and the first timer length is greater than the second timer length, the receiver is turned off and the third timer is started, and the length of the third timer is used. Subtracting the difference between the length of the second timer and the length of the second timer;

And configured to: when the third timer expires, turn on the receiver to wait for receiving the data that is retransmitted again, and start a unit for monitoring the fourth timer of the continuous open duration of the receiver, where the length of the fourth timer is the second timer. Twice the length.

Further, the first mobile communication terminal provided by the embodiment of the present invention further includes:

Means for starting the fifth timer to wait for receiving data for retransmission when the second timer expires without receiving the retransmission data, and further determining that the first timer length is not greater than the second timer length, The length of the five timers is the sum of the first timer length plus the second timer length.

The embodiment of the present invention further provides a second mobile communication terminal, including:

When the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, if the receiver is in the off state, the receiver is turned on, and the second timer for monitoring the waiting time of the first retransmission data is started. The unit, the length of the first timer is less than or equal to a minimum time interval between the first timer start time and the first retransmission data arrival time, and the first timer length is greater than the second timing Length

a unit for not closing the receiver and starting the third timer when the second timer expires, the length of the third timer is the difference between the length of the first timer minus the length of the second timer ;

The first timer is started when receiving a downlink data transmission indication during a listening phase of discontinuous reception; or

When the downlink data is not correctly received, it is determined that the downlink data is sent to the base station and the indication information is not correctly received.

In summary, the downlink data receiving control method and the mobile communication terminal provided by the embodiment of the present invention use the Timer X timer to monitor the time difference between the earliest arrival time of the retransmitted data and the latest arrival time of the first retransmission data, and When the Timer X timer expires, the receiver is turned on to wait for receiving data to be retransmitted again, and the timer Timer Y is simultaneously started to monitor the difference between the earliest arrival time and the latest arrival time of the data to be retransmitted again, thereby It is possible to decide whether to turn off the receiver in time when the Timer expires. Therefore, it is ensured that the receiver remains open during the period in which the retransmission data can be reached again, and the success rate of receiving the retransmitted data is improved.

Further, the embodiment of the present invention starts the timer for monitoring the retransmission data receiving time only after receiving the downlink data and determining that the data is not correctly received, and avoids starting the timer when the data has been correctly received, thereby greatly reducing The number of timer starts is avoided, and additional power consumption is avoided. Further, since the start time of the timer is the time for sending the NACK, the set duration of the timer can be reduced, thereby further reducing the running time of the first timer, thereby further saving the power loss of the eUE. In the TDD system, the UE is prevented from opening the receiver in advance to receive the retransmission data, and the flexibility of the eNB to schedule retransmission data is improved. It is within the spirit and scope of the invention. Thus, if these modifications and variations of the invention belong to the invention The invention is also intended to cover such modifications and variations within the scope of the appended claims.

Claims

Rights request

A control method for receiving downlink data by a mobile communication terminal, comprising: not receiving the first retransmission data when a second timer for monitoring the first retransmission data waiting time expires, and determining the When the second timer length is less than the first timer length for monitoring the first retransmission data arrival time of the downlink data, the receiver is turned off and a third timer for monitoring the earliest arrival time of the retransmitted data is started;

2. The control method according to claim 1, further comprising:

When the first retransmission data is not received when the second timer expires, and further determining that the second timer length is not less than the first timer length, the fifth timer is started to wait for receiving the data that is retransmitted again.

The control method according to claim 1 or 2, further comprising:

When the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, the receiver is turned on, and a second timer for monitoring the first retransmission data waiting time is started.

4. The control method according to claim 1 or 2, characterized in that

The first timer is started after determining that the downlink data is not correctly received by the base station when the downlink data is not correctly received.

5. The method of claim 1 or 2, wherein

The length of the first timer is less than or equal to a minimum time interval between the first timer start time and the first retransmission data arrival time;

6. The method of claim 2, wherein The length of the fifth timer is the sum of the first timer length plus the second timer length.

7. The control method according to claim 5, characterized in that

When the start time of the first timer and the sending time of the incorrect receiving indication information are the same, the minimum time interval is: a transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station, And the sum obtained after the base station processes the time required to correctly receive the indication information;

The control method according to claim 7, wherein the transmission delay of the incorrectly received indication information transmitted between the mobile communication terminal and the base station is added, and the base station needs to process the incorrect reception of the indication information. The sum obtained after time is: 4 ms.

The control method according to claim 1 or 2, further comprising: returning correct reception indication information to the base station when determining that the downlink data is correctly received.

10. A mobile communication terminal, comprising:

And not receiving the retransmission data when the second timer for monitoring the first retransmission data waiting time expires, and determining that the second timer length is less than the first time of the first retransmission data arrival time for monitoring the downlink data At the length of the timer, the receiver is turned off and a unit for monitoring the third timer for monitoring the earliest arrival time of the data again is started;

The mobile communication terminal according to claim 10, further comprising: configured to: when the second timer expires, not receiving the first retransmission data, and further determining the second timer length When not less than the first timer length, the fifth timer is started to wait for receiving the data of the retransmitted data again.

The mobile communication terminal according to claim 10 or 11, further comprising: when the first timer for monitoring the arrival time of the first retransmission data of the downlink data expires, causing the receiver to be in an open state, And initiating a unit for monitoring the second timer of the first retransmission data waiting time.

13. The mobile communication terminal according to claim 10 or 11, wherein

The mobile communication terminal according to claim 10 or 11, wherein

15. The mobile communication terminal according to claim 11, wherein

The length of the fifth timer is the sum of the first timer length plus the second timer length.