CN101742532A - Control method for mobile communication terminal to receive downlink data and mobile communication terminal - Google Patents

Abstract

The invention relates to mobile communication technology, in particular to technology for receiving downlink data in a discontinuous reception way by a mobile terminal, and provides a control method for receiving the downlink data and the mobile communication terminal, which are used for improving the success rate of receiving retransmission data. The control method for receiving the downlink data and the mobile communication terminal provided by the embodiment of the invention utilizes a third timer to monitor time difference between the earliest arrival time of second retransmission data and the latest arrival time of first retransmission data, to turn on a receiver to wait receiving the re-transmitted data when the third timer is expired, and to start a fourth timer at the same time to monitor the difference between the earliest arrival time and the latest arrival time of the second retransmission data so as to determine whether the receiver is turned off in time when the fourth timer is expired, thereby ensuring that the receiver keeps an opening state in a time period when the second retransmission data is possibly arrived and improving the success rate of receiving the retransmission data.

Description

Control method for mobile communication terminal to receive downlink data and mobile communication terminal

technical field

The invention relates to mobile communication technology, in particular to a technology for discontinuously receiving mobile terminals to receive downlink data.

Background technique

The Discontinuous Reception (DRX) function allows the user equipment (UserEquipment: UE) to turn off the receiver under certain conditions without having to listen to the physical downlink control channel (Physical Downlink Control Channel: PDCCH) all the time, so as to save UE power the goal of.

The basic principle of DRX is shown in Figure 1 below. The DRX cycle consists of a continuous PDCCH listening phase (OnDuration) and a possible dormancy phase (Opportunity for DRX). The units of the length of the On Duration phase and the Opportunity for DRX phase are the number of subframes . In the On Duration phase, the UE must continuously listen to each subframe containing PDCCH to obtain the resource allocation indication for uplink and downlink transmission of each subframe, and determine the uplink and downlink time allocated by the base station to itself according to the resource allocation indication of each subframe frequency resources, and perform 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, Evolved Universal Terrestrial Radio Access Network) system, in order to save the battery consumption of the UE when there is no data to send and receive, the UE can perform DRX operations, that is, temporarily turn off the receiver , wake up at the time agreed with the base station and monitor the corresponding PDCCH, so as to know whether the base station has data to be sent to the UE during the sleep period. The DRX operation includes some set parameters and some timers for control. For example, the parameters included are DRX Cycle (DRX Cycle), and the timers included are OnDuration Timer (OnDuration Timer), DRX Inactivity Timer ( DRX Inactivity Timer), etc. The UE monitors the PDCCH during the OnDuration period. If it does not monitor the data indication sent by the base station to itself, it will enter the sleep state after the On Duration Timer timer expires. If the UE monitors the PDCCH during the On Duration period and learns that there is a data indication sent to itself, it will start the DRX InactivityTimer. If the PDCCH again indicates that there is data transmission to the user before the DRX Inactivity Timer timer expires, the DRX Inactivity Timer will restart Start; only when the DRX Inactivity Timer and the On Duration timer both expire, the UE can enter the sleep phase. Therefore, the On Duration of the UE in the DRX cycle is always in the active (Active) state, but in the Opportunity for DRX phase, it may be in the active state or in the dormant state.

In the E-UTRAN (Evolved Universal Terrestrial Radio Access Network, Evolved Universal Terrestrial Radio Access Network) system, it is stipulated that DRX control and Hybrid Automatic Repeat Request (Hybrid Automatic Repeat Request: HARQ) operate independently, that is to say, in HARQ need When performing downlink data retransmission, 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 order to prepare for receiving the downlink retransmission transfer data. Besides, HARQ retransmission will not further affect normal DRX operation. And because the LTE downlink uses asynchronous HARQ, the existing LTETER8 also defines the DRX Retransmission Timer timer related to the downlink HARQ data transmission control, so that the eUE can return to the dormant state when it does not receive retransmission data within a certain period of time , turn off the receiver.

The following takes eUE in a subframe of the On Duration stage, and determines that the evolved base station (eNB) in the LTE system has allocated downlink data transmission resources for the eUE in this subframe by listening to the resource allocation indication of PDCCH as an example to describe in detail In LTE Release 8 (Release 8), the eUE performs the coordination control process of DRX and downlink HARQ.

As shown in Figure 2, taking a DRX cycle as an example, set the DRX cycle to 20 subframes, among which: set the length of the On Duration phase to two subframes, and the length of the DRX Inactivity Timer to two subframes. According to existing standards, one subframe The length is 1ms. If the eUE monitors 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 the first timer for the corresponding HARQ process in the first subframe of the current DRX cycle, the HARQ RTT (Round Trip Time) Timer timer, and processes downlink data; at the same time, the eUE starts the DRX Inactivity Timer;

S202. The eUE judges whether the data is received correctly. If it is received correctly, the eUE feeds back ACK (Acknowledgment) to the eNB; if the downlink data is not received correctly, the eUE feeds back NACK (Negative Acknowledgment) to the eNB;

The purpose of the HARQ RTT Timer 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 UE receiver is on when the retransmission arrives. . In the prior art, it generally takes 4ms for the eUE to receive and process downlink data, that is, the 4th subframe after the first subframe of the current DRX cycle may feed back ACK or NACK to the eNB, and the transmission delay of the ACK or NACK to the eNB and eNB The sum of the time to demodulate ACK or NACK is generally 4ms. In this way, even if eNB demodulates NACK and immediately schedules retransmission data, the retransmission data will be delivered to eUE in the 8th subframe after the first subframe at the earliest Therefore, when setting the length of the HARQ RTT Time timer, the minimum time interval is generally set to 8ms, so as to ensure that the receiver is turned on before the retransmission data arrives, so as to ensure that the retransmission data can be received.

S203. When the HARQ RTT Timer expires and the downlink data is not received correctly, that is, when the eUE feeds back 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 at the same time.

The start of the DRX Retransmission Timer timer is to monitor the waiting time for receiving retransmission data, and prevent the eNB from mistakenly demodulating NACK into ACK and no longer retransmitting data. The eUE waits indefinitely, and its length depends on the maximum waiting time required. Determined, the eNB configures it to the eUE through the radio resource control (Radio Resource Control: RRC) process. During the operation of DRX Retransmission Timer, if the eUE receives the retransmission data correctly, it will turn off the receiver and enter the dormant state after receiving the data; Wait again, turn off the receiver, and go to sleep mode.

If the eUE does not detect the downlink data indication sent to itself on the PDCCH during the On Duration period, the UE will turn off the receiver after the On Duration is over and enter the sleep phase; if the UE monitors the PDCCH during the On Duration period and knows that it has sent it to itself When the data indicates that the DRXInactivity Timer is started, if the PDCCH indicates data transmission to the user again before the DRX Inactivity Timer timer expires, the DRX Inactivity Timer will be restarted; only when the DRXInactivity Timer timer and the On Duration timer are both expires, the UE can enter the sleep phase. When the eUE fails to receive downlink data correctly, the eUE also needs to turn on the receiver after the HARQ RTT Timer expires, and the longest time it is turned on is equal to the duration of the DRX Retransmission Timer.

However, if the PDCCH indicating downlink retransmission data transmission is lost, the retransmission data is not received after the DRXRetransmission Timer is set, and the eUE cannot receive the retransmission scheduled by the eNB for the eUE if it enters the dormant state.

As shown in Figure 3, when the downlink data indication is monitored at T ₀ , 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 received correctly, the eUE sends the eNB _the Feedback NACK. The eNB schedules the retransmission data of the eUE according to the NACK, assuming that the PDCCH indicated by the first retransmission appears at T ₂ at the earliest and at T ₄ at the latest. If the PDCCH indicated by the first retransmission is lost, the eUE will not feedback the correct Receive the ACK of the downlink retransmission data; if the maximum number of retransmissions has not been reached at this time, the eNB will schedule retransmission data for the eUE again after the time length of the HARQ RTT Timer after the last PDCCH. Corresponding to the first retransmission of the PDCCH that may occur at the earliest possible time _T2 , its retransmission occurs at the earliest time _T3 : _T3 = _T2 + HARQ RTT Timer, and occurs at the latest time _T5 , _T5 = _T2 + HARQ RTTTimer+DRX Retransmission Timer=T ₃ +DRX Retransmission Timer. Corresponding to the first retransmission of the PDCCH that may occur at the latest at time T ₄ , its retransmission occurs at the earliest time T ₅ , T ₅ =T ₄ +HARQ RTT Timer, and occurs at the latest at T ₆ time, T ₆ =T ₄ +HARQ RTT Timer+DRX Retransmission Timer=T ₅ +DRX Retransmission Timer. In fact, the retransmitted data may arrive at any time from T ₃ to T ₆ . If the eUE enters the dormant state after the end of T ₄ according to the DRX Retransmission Timer, it will miss the retransmission data occurring in T ₄ to T ₆ .

Contents of the invention

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

The first method for controlling a mobile communication terminal receiving downlink data provided by an embodiment of the present invention includes:

When the first timer used to monitor the arrival time of the first retransmission data of the downlink data expires, if the receiver is turned off, the receiver is turned on, and the second timer used to monitor the waiting time of the retransmission data is started, so The length of the first timer is less than or equal to the minimum time interval between the start time of the first timer and the arrival time of the first retransmission data;

No retransmission data is received when the second timer expires, and when it is determined that the length of the first timer is greater than the length of the second timer, turn off the receiver and start a third timer, the third timer The length of is the difference between the length of the first timer minus the length of the second timer;

When the third timer expires, open the receiver to wait for receiving data retransmitted again, and start a fourth timer for monitoring the continuous open time of the receiver, the length of the fourth timer is the second timer twice the length.

Further, when the retransmission data is not received when the second timer expires, and it is further determined that the length of the first timer is not greater than the length of the second timer, start a fifth timer and wait for receiving retransmitted data again , the length of the fifth timer is the sum of the length of the first timer plus the length of the second timer.

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

Alternatively, the first timer is started after it is determined to send downlink data incorrectly received indication information to the base station when the downlink data is not received correctly.

And, when the start time of the first timer is the same as the sending time of the incorrectly received indication information, the minimum time interval is: when the incorrectly received indication information is transmitted between the mobile communication terminal and the base station delay, and the sum obtained after adding the time required by the base station to process the incorrectly received indication information;

When the start time of the first timer is earlier than the sending time of the incorrectly received 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, The sum obtained by adding the time required for the base station to process the incorrectly received indication information and the time difference between the timer start time and the incorrectly received indication information sending time;

When the start time of the first timer is later than the sending time of the incorrectly received 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, The sum obtained by adding the time required for the base station to process the incorrectly received indication information, and subtracting the time difference between the timer start time and the incorrectly received indication information sending time is obtained.

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

The second control method for a mobile communication terminal to receive downlink data provided by an embodiment of the present invention includes:

When the first timer used to monitor the arrival time of the first retransmission data of the downlink data expires, if the receiver is turned off, the receiver is turned on, and the second timer used to monitor the waiting time of the retransmission data is started, so The length of the first timer is less than or equal to the minimum time interval between the start time of the first timer and the arrival time of the first retransmitted data, and the length of the first timer is greater than the length of the second timer;

When the second timer expires, no retransmission data is received, the receiver is turned off and a third timer is started, and 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, open the receiver to wait for receiving data retransmitted again, and start a fourth timer for monitoring the continuous open time of the receiver, the length of the fourth timer is the second timer twice the length.

The first 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 turned off, the receiver is turned on, and the unit for starting the second timer for monitoring the waiting time of the retransmission data , the length of the first timer is less than or equal to the minimum time interval between the start time of the first timer and the arrival time of the first retransmitted data;

A unit for turning off the receiver and starting a third timer when no retransmission data is received when the second timer expires and it is determined that the length of the first timer is greater than the length of the second timer, the 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 retransmitted again, and a unit for starting a fourth timer for monitoring the duration of the receiver being continuously turned on, the length of the fourth timer is Twice the length of the second timer.

Further, the mobile communication terminal also includes:

When the second timer expires and no retransmission data is received, and it is further determined that the length of the first timer is not greater than the length of the second timer, start a fifth timer and wait to receive retransmitted data again unit, the length of the fifth timer is the sum of the length of the first timer plus the length of the second timer.

Wherein, the first timer: is started when a downlink data transmission instruction is received during the listening phase of discontinuous reception; or after the downlink data is not correctly received when the downlink data is not received correctly, it is determined to send the downlink data incorrectly received instruction information to the base station started.

The 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 turned off, the receiver is turned on, and the unit for starting the second timer for monitoring the waiting time of the retransmission data , the length of the first timer is less than or equal to the minimum time interval between the start time of the first timer and the arrival time of the first retransmitted data, and the length of the first timer is greater than the length of the second timer;

A unit for turning off the receiver and starting a third timer when no retransmission data is received when the second timer expires, the length of the third timer being the length of the first timer minus the second timer the difference in length;

When the third timer expires, the receiver is turned on to wait for receiving data retransmitted again, and a unit for starting a fourth timer for monitoring the duration of the receiver being continuously turned on, the length of the fourth timer is Twice the length of the second timer.

In summary, the downlink data reception control method and mobile communication terminal provided by the embodiments of the present invention use the third timer to monitor the time difference between the earliest arrival time of retransmitted data and the latest arrival time of first retransmitted data, and When the third timer expires, open the receiver and wait to receive the data retransmitted again, and start the fourth timer simultaneously to monitor the difference between the earliest arrival time and the latest arrival time of the retransmission data again, thereby It is possible to decide whether to turn off the receiver in time when the fourth timer expires. It is ensured that the receiver remains open during the time period when retransmission data may arrive again, and the success rate of receiving retransmission data is improved.

Description of drawings

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

FIG. 2 and FIG. 3 are respectively schematic diagrams of downlink data reception control principles of an 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 provided by the embodiment of the present invention.

Detailed ways

As shown in Figure 4, in order to improve the success rate of receiving retransmission data, the embodiment of the present invention provides the following technical solutions when the length of the DRXRetransmission Timer is less than the length of the HARQ RTT Timer, that is, when the _T3 time appears after the _T4 time:

Step S401, when the eUE monitors the downlink data indication at time T ₀ , start the first timer HARQ RTT Timer;

The HARQ RTT Timer timer is used to monitor the arrival time of the first retransmission data of the 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 timer expires at time _T2 . If the eUE is dormant when the HARQ RTT Timer timer expires and the receiver is turned off, then turn on the receiver and start the second timer: DRX Retransmission Timer If the eUE receiver is already on when the HARQ RTT Timer timer expires, it will keep the receiver on and start the DRX Retransmission Timer timer;

The DRX Retransmission Timer timer is used to monitor the retransmission data waiting time, and the length should be the difference between the latest arrival time and the earliest arrival time of the first retransmission data, that is, T ₄ minus T ₂ .

Step S403, the DRX Retransmission Timer timer expires at time _T4 , and when the eUE does not receive retransmission data when the Retransmission Timer timer expires, it turns off the receiver and enters the sleep state and starts a third timer, 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 retransmitted data. The length is T ₃ minus T ₄ , which is equal to the length of the HARQ RTT Timer minus DRX Retransmission The length of the Timer timer.

Step S404, when the Timer X timer expires, the eUE must open the receiver to wait for receiving the retransmitted data again, and start the fourth timer Timer Y at the same time;

The Timer Y timer is used to monitor the continuous open time of the receiver to receive the retransmitted data again. The continuous open time of the receiver should be the difference between the earliest arrival time and the latest arrival time of the retransmitted data again, and the length is T ₆ Subtracting T ₃ is equal to twice the length of the DRX Retransmission Timer.

In this way, when the retransmission data is received during the running of the Timer Y timer, the eUE can turn off the receiver when no other related timers are running, or when the retransmission data is still not received when the Timer Y timer expires, The eUE may also turn off the receiver when no other relevant timers are running. Therefore, it is ensured that the receiver is in the open state during the period T ₄ ~ T ₆ , and can receive possible retransmission data, and the receiver is in the closed state when there is no data retransmission during the period T ₄ ~ T ₃ , The power of the eUE is saved.

In the above embodiment, if the length of the DRX Retransmission Timer is limited to be less than the length of the HARQRTT Timer, then in step S403, the eUE can directly start the third timer TimerX, if there is no limit, the length of the DRX Retransmission Timer must be less than the length of the HARQ RTT Timer length, you need to make sure that the length of the DRX Retransmission Timer is less than the length of the HARQ RTT Timer, and then start the third timer Timer X, otherwise the third timer will not be started, but the fifth timer will be started. The specific technology The scheme is as follows.

As shown in Figure 5, when the length of the DRX Retransmission Timer is not less than the length of the HARQ RTT Timer, that is, when the time _T4 occurs after the time _T3 , the eUE keeps the receiver on after the DRX Retransmission Timer expires and starts the first Five timers, NEW Timer timer, whose length is the sum of HARQ RTT Timer and DRX Retransmission Timer, so that the eUE receiver can be in the open state during T ₄ ~ T ₆ , waiting to receive possible retransmission data again.

In the embodiments shown in Figure 4 and Figure 5, the minimum time interval for setting the length of the HARQ RTT Timer timer includes the sum of the following three parts: the time required for the eUE to receive and process downlink data, the ACK or NACK sent by the eUE to the eNB Transmission delay, and the time required for eNB to demodulate and process ACK or NACK. Generally, it takes 4ms for the eUE to receive and process downlink data, that is, in the fourth subframe after the first subframe of the current DRX cycle, ACK or NACK may be fed back to the eNB at time _T1 , and the transmission delay for the ACK or NACK to reach the eNB The total time for demodulating ACK or NACK with eNB is generally 4ms. In this way, even if eNB demodulates NACK and immediately schedules retransmission data, the retransmission data will be sent at the fastest in the 8th subframe after the first subframe For eUE, therefore, when setting the length of the HARQ RTTTime timer, the minimum time interval is generally set to 8ms.

Considering that when the eUE correctly receives the downlink data and feeds back ACK to the eNB, no downlink retransmission data arrives. Therefore, the embodiment of the present invention further reduces the power consumption of the eUE and provides the following improvement scheme. Only after the eUE feeds back NACK to the eNB, the Start the HARQ RTTTimer timer that controls the reception of retransmission data, avoiding the timer start after the downlink data is correctly received, thereby saving the power consumption of the eUE. As shown in Figure 6, it includes the following steps:

Step S601, the eUE receives and processes downlink data at time T ₀ , and judges whether the data is received correctly;

Step S602, if the reception is correct, the eUE feeds back ACK to the eNB at time _T1 ; if the downlink data is not received correctly, the eUE feeds back NACK to the eNB at time _T1 , and starts a timer for the corresponding HARQ process. The embodiment of the present invention is called It is eNB Processing Delay Timer (eNB ProcessingTimer);

Step S603, when the eNB Processing Timer timer expires, if the eUE is sleeping and the receiver is off, the eUE turns on the receiver to end the sleeping state, enters the receiving state of retransmission data, and starts the DRX Retransmission Timer timer at the same time.

Step S604, the DRX Retransmission Timer expires at time _T4 , and when the DRXRetransmission Timer expires, if the eUE does not receive retransmission data, it turns off the receiver and enters the dormant state and starts a third timer, 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 retransmitted data. The length is T ₃ minus T ₄ , which is equal to the length of the HARQ RTT Timer minus DRX Retransmission The length of the Timer timer.

Step S605, when the Timer X timer expires, the eUE must turn on the receiver and wait to receive the retransmitted data again, and start the fourth timer Timer Y at the same time.

The Timer Y timer is used to monitor the continuous open time of the receiver to receive retransmitted data again. The maximum continuous open time of the receiver should be the difference between the earliest arrival time and the latest arrival time of the retransmitted data again, and the length is T ₆ minus T ₃ is equal to twice the DRX Retransmission Timer.

Among them: the function of the eNB Processing Timer timer is still to monitor the minimum time interval before the retransmission data arrives, and 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 a dormant state, the eUE needs to turn on the receiver to end the dormant state, and wait until receiving retransmitted data.

The eUE starts the eNB Processing Timer timer and the time can be the same as the time of sending NACK, for example, the same subframe or the same millisecond (ms), or it can be different, as long as the length of the timer is less than or equal to: the start time of the eNB Processing Timer timer and The time interval between the earliest possible arrival times of retransmitted data of the downlink data. The time interval between the earliest possible arrival time of the retransmission data and the start time of the eNB ProcessingTimer timer is the minimum time interval before the arrival of the retransmission data, and the eNB Processing Timer timer must expire before or when the retransmission data arrives, This triggers the eUE to turn on the receiver.

When the starting time of the eNB Processing Timer timer is the same as the sending time of NACK, the minimum time interval is exactly: the transmission delay of the incorrectly received indication information NACK transmitted between the mobile communication terminal and the base station, plus the time required by the base station to process the NACK The sum obtained after time. When the start time of the eNB Processing Timer timer is earlier than the sending time of NACK, the minimum time should be added to the time difference between the starting time of the eNB Processing Timer timer and the sending time of NACK, otherwise when the start time of the eNB Processing Timer timer When it is later than the sending time of NACK, the minimum time should be the value obtained after subtracting the time difference between the start time of the eNB Processing Timer timer and the sending time of NACK.

In the following, the start time of the eNB Processing Timer is the same as the sending time of the NACK as a preferred embodiment for detailed description.

When the eUE receives retransmission data during the running of the DRX Retransmission Timer timer, it will turn off the receiver and enter the dormant state again after receiving the retransmission data, or if it does not receive retransmission data during the running of the DRXRetransmission Timer timer, then the DRXRetransmission After the timer set time is up, turn off the receiver and enter the dormant state again. Of course, if the DRX Inactivity Timer has not expired when the DRX Retransmission Timer timer expires, the eUE needs to turn off the receiver and enter the sleep state again when the DRX Inactivity Timer timer expires.

In this way, when the eUE receives the downlink data and judges that the data is received correctly, the eNB processing delay timer is not started because the later data retransmission will not occur, thereby reducing the number of times the timer is started and avoiding additional power consumption consume. Especially in an environment with good communication conditions, the probability of data retransmission is very low, which greatly saves the power consumption of the eUE.

Referring to Figure 4, it can be seen that the minimum time interval for setting the length of the HARQ RTT Timer timer includes the sum of the following three parts: the time required for the eUE to receive and process downlink data, the transmission delay of the ACK or NACK sent by the eUE to the eNB, and the eNB The time required to demodulate and process an ACK or NACK. As shown in Figure 6, the minimum time interval for setting the length of the corresponding eNB Processing Timer 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, usually Yes, the sum of these two parts of time is basically equal to the time required for eUE to receive and process downlink data, so the maximum duration of eNB processing delay timer is set according to the sum of the transmission delay of ACK or NACK and the time required for eNB to demodulate ACK or NACK time, for example 4ms, thereby further reducing the running time of the first timer and further saving the power consumption of the eUE. Of course, the duration of the eNB Processing Timer timer can also be set to 3ms or 2ms, etc.

The basis of the above analysis is that after the eUE determines that the downlink data has not been received correctly, it can obtain the uplink resource to send the ACK or NACK feedback information to the eNB, so as to successfully send the ACK or NACK feedback information. According to the duplex mode of the FDD system, in the FDD system However, in the TDD system, since there are 7 different uplink and downlink time slot ratios, after the eUE determines that the downlink data has not been received correctly, there may not be immediately available uplink resources for feeding back ACK or NACK , which makes it necessary to set the duration of the DRX Retransmission Timer long enough to ensure that the eNB schedules the retransmission data of the eUE during the operation of the DRX Retransmission Timer. Therefore, for the TDD system in the prior art, it must be considered that the eUE may not receive retransmitted data within a certain period of time after turning on the receiver, 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 DRXRetransmission Timer, which will reduce the flexibility of the eNB scheduling and cause the eUE to be unable to use a smaller DRX RetransmissionTimer, such as 1ms, 2ms, etc., but larger values such as 16ms, 24ms, 33ms, etc. must be used, which further leads to the power saving function of the DRX mechanism being greatly reduced. After adopting the technical solution provided by the embodiment of the present invention, in the TDD system, since the start time of the eNB Processing Timer timer is the time to send NACK, when setting the maximum duration of the eNB Processing Timer timer, it is not necessary to consider the The difference in delay between downlink transmission and the corresponding uplink ACK or NACK feedback information caused by the difference in time slot configuration and the used downlink subframe only needs to consider the transmission delay and eNB demodulation of the NACK sent by the eUE to the eNB The time required for NACK, thus further reducing the running time of the first timer in the TDD system, and improving the flexibility of eNB scheduling retransmission data.

It should be noted that in all the above-mentioned embodiments, after the eUE judges that the data is received correctly, it may not feed back any information to the eNB, and only feed back NACK to the eNB when the data is not received correctly, so that the eNB defaults to receiving any feedback information from the eUE The data has been received correctly, and the data is retransmitted when a NACK is received.

The embodiment of the present invention takes the receiving control of one downlink data as an example to describe the technical solution in detail. In fact, the receiving control process of each downlink data is completely the same.

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

When the first timer used to monitor the arrival time of the first retransmission data of the downlink data expires, if the receiver is turned off, the receiver is turned on, and the second timer used to monitor the waiting time of the retransmission data is started unit, the length of the first timer is less than or equal to the minimum time interval between the start time of the first timer and the arrival time of the first retransmitted data;

When the second timer expires and no retransmission data is received, and it is determined that the length of the first timer is greater than the length of the second timer, the unit that turns off the receiver and starts the third timer, the length of the third timer is the difference between the length of the first timer minus the length of the second timer;

It is used to turn on the receiver when the third timer expires and wait to receive the data retransmitted again, and start the unit of the fourth timer for monitoring the duration of the continuous opening of the receiver. The length of the fourth timer is the second timer twice the length.

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

A unit for starting the fifth timer and waiting to receive retransmitted data when the second timer expires and no retransmission data is received, and it is further determined that the length of the first timer is not greater than the length of the second timer. The length of the fifth timer is the sum of the length of the first timer plus the length of the second timer.

The embodiment of the present invention also 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 turned off, the receiver is turned on, and the unit for starting the second timer for monitoring the waiting time of the retransmission data , the length of the first timer is less than or equal to the minimum time interval between the start time of the first timer and the arrival time of the first retransmitted data, and the length of the first timer is greater than the length of the second timer;

A unit for turning off the receiver and starting a third timer when no retransmission data is received when the second timer expires, the length of the third timer being the difference between the length of the first timer minus the length of the second timer ;

It is used to turn on the receiver when the third timer expires and wait to receive the data retransmitted again, and start the unit of the fourth timer for monitoring the duration of the continuous opening of the receiver. The length of the fourth timer is the second timer twice the length.

Wherein, the first timer: is started when a downlink data transmission instruction is received during the listening phase of discontinuous reception; or

It is started after it is determined to send downlink data incorrectly received indication information to the base station when the downlink data is not received correctly.

In summary, the downlink data reception control method and mobile communication terminal provided by the embodiments of the present invention use the TimerX timer to monitor the time difference between the earliest arrival time of retransmitted data and the latest arrival time of first retransmitted data, and When the Timer X timer expires, turn on the receiver and wait to receive the retransmitted data, and start the timer Timer Y at the same time to monitor the difference between the earliest arrival time and the latest arrival time of the retransmission data, so that When Timer Y expires, decide whether to turn off the receiver in time. Therefore, it is ensured that the receiver remains open during the time period when retransmission data may arrive again, and the success rate of receiving retransmission data is improved.

Further, the embodiment of the present invention only starts the timer for monitoring the receiving time of retransmission data after receiving the downlink data and judging that the data has not been received correctly, so as to avoid starting the timer when the data has been received correctly, thereby greatly reducing The number of starts of the timer is increased, and additional power consumption is avoided. Further, since the start time of the timer is the time of sending the NACK, the setting duration of the timer can be reduced, thereby further reducing the running time of the first timer, and further saving the power consumption of the eUE. And in the TDD system, the UE is prevented from turning on the receiver in advance to wait for retransmission data, and at the same time, the flexibility of eNB scheduling retransmission data is improved.

Apparently, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (18)

1. the control method of a mobile communication terminal downlink data receiving is characterized in that, comprising:

When the first timer of the data retransmission first time of advent that is used to monitor downlink data expires, if being in closed condition, receiver opens receiver, and starting the second timer be used to monitor the data retransmission stand-by period, the length of described first timer is smaller or equal to first timer start-up time and the minimum interval of data retransmission between the time of advent first;

When expiring, described second timer do not receive data retransmission, and when determining that described first timer length is greater than second timer length, close receiver and start the 3rd timer, the length of described the 3rd timer deducts the difference of second timer length for first timer length;

Open receiver and wait for receive the data that retransmit once more when described the 3rd timer expires, and start and be used for the 4th timer that monitoring receiver continues to open duration, the length of described the 4th timer is the twice of second timer length.

2. control method as claimed in claim 1 is characterized in that, also comprises:

When expiring, described second timer do not receive data retransmission, and when determining that further described first timer length is not more than second timer length, start the 5th timer and wait for to receive the data that retransmit once more, the length of described the 5th timer for first timer length add second timer length and.

3. control method as claimed in claim 1 or 2 is characterized in that, described first timer: be to start when the stage of intercepting of discontinuous reception receives the downlink data transmission indication.

4. control method as claimed in claim 1 or 2 is characterized in that, described first timer: be when correct downlink data receiving, determine to send to the base station and start after downlink data does not correctly receive indication information.

5. control method as claimed in claim 4, it is characterized in that, when the start-up time of described first timer is identical with the transmitting time that does not correctly receive indication information, described minimum interval is: describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described correctly do not receive obtain behind the indication information required time and;

When start-up time of described first timer when correctly not receiving the transmitting time of indication information, described minimum interval is: describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described that obtain after correctly not receiving indication information required time and timer start-up time and correctly not receiving time difference between the indication information transmitting time and;

When be later than the transmitting time that does not correctly receive indication information the start-up time of described first timer, described minimum interval is: describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described correctly do not receive that the indication information required time obtains and, the value that obtains after deducting timer start-up time again and correctly not receiving time difference between the indication information transmitting time.

6. control method as claimed in claim 5, it is characterized in that, describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described correctly do not receive obtain behind the indication information required time and be: 4 milliseconds.

7. control method as claimed in claim 1 or 2 is characterized in that, also comprises: when determining that downlink data is correctly received, return correct reception indication information to the base station.

8. the control method of a mobile communication terminal downlink data receiving is characterized in that, comprising:

When the first timer of the data retransmission first time of advent that is used to monitor downlink data expires, if being in closed condition, receiver opens receiver, and startup is used to monitor the second timer of data retransmission stand-by period, the length of described first timer is smaller or equal to first timer start-up time and the minimum interval of data retransmission between the time of advent first, and described first timer length is greater than second timer length;

Do not receive data retransmission and close receiver and start the 3rd timer when described second timer expires, the length of described the 3rd timer deducts the difference of second timer length for first timer length;

Open receiver and wait for receive the data that retransmit once more when described the 3rd timer expires, and start and be used for the 4th timer that monitoring receiver continues to open duration, the length of described the 4th timer is the twice of second timer length.

9. control method as claimed in claim 8 is characterized in that, described first timer: be to start when the stage of intercepting of discontinuous reception receives the downlink data transmission indication.

10. control method as claimed in claim 8 is characterized in that, described first timer: be when correct downlink data receiving, determine to send to the base station and start after downlink data does not correctly receive indication information.

11. control method as claimed in claim 10, it is characterized in that, when the start-up time of described first timer is identical with the transmitting time that does not correctly receive indication information, described minimum interval is: describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described correctly do not receive obtain behind the indication information required time and;

When start-up time of described first timer when correctly not receiving the transmitting time of indication information, described minimum interval is: describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described that obtain after correctly not receiving indication information required time and timer start-up time and correctly not receiving time difference between the indication information transmitting time and;

When be later than the transmitting time that does not correctly receive indication information the start-up time of described first timer, described minimum interval is: describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described correctly do not receive that the indication information required time obtains and, the value that obtains after deducting timer start-up time again and correctly not receiving time difference between the indication information transmitting time.

12. control method as claimed in claim 8, it is characterized in that, describedly correctly do not receive the propagation delay time that indication information transmits between mobile communication terminal and base station, add the base station handle described correctly do not receive obtain behind the indication information required time and be: 4 milliseconds.

13. as the arbitrary described control method of claim 8～12, it is characterized in that, also comprise: when determining that downlink data is correctly received, return correct reception indication information to the base station.

14. a mobile communication terminal is characterized in that, comprising:

Be used for when the first timer of data retransmission first time of advent of monitoring downlink data expires, if being in closed condition, receiver opens receiver, and starting the unit of the second timer be used to monitor the data retransmission stand-by period, the length of described first timer is smaller or equal to first timer start-up time and the minimum interval of data retransmission between the time of advent first;

Be used for when described second timer expires, not receiving data retransmission, and when determining that described first timer length is greater than second timer length, close receiver and start the unit of the 3rd timer, the length of described the 3rd timer deducts the difference of second timer length for first timer length;

Be used for opening receiver and wait for and receive the data that retransmit once more when described the 3rd timer expires, and start and be used for the unit that monitoring receiver continues to open the 4th timer of duration, the length of described the 4th timer is the twice of second timer length.

15. mobile communication terminal as claimed in claim 14 is characterized in that, also comprises:

Be used for when described second timer expires, not receiving data retransmission, and when determining that further described first timer length is not more than second timer length, start the unit that the 5th timer wait for to receive the data that retransmit once more, the length of described the 5th timer for first timer length add second timer length and.

16., it is characterized in that described first timer: be when the stage of intercepting of discontinuous reception receives the downlink data transmission indication, to start as claim 14 or 15 described mobile communication terminals; Perhaps

Be when correct downlink data receiving, determine to send and start after downlink data does not correctly receive indication information to the base station.

17. a mobile communication terminal is characterized in that, comprising:

Be used for when the first timer of data retransmission first time of advent of monitoring downlink data expires, if being in closed condition, receiver opens receiver, and start the unit of the second timer be used to monitor the data retransmission stand-by period, the length of described first timer is smaller or equal to first timer start-up time and the minimum interval of data retransmission between the time of advent first, and described first timer length is greater than second timer length;

Be used for not receiving when described second timer expires the unit that data retransmission is closed receiver and started the 3rd timer, the length of described the 3rd timer deducts the difference of second timer length for first timer length;

Be used for opening receiver and wait for and receive the data that retransmit once more when described the 3rd timer expires, and start and be used for the unit that monitoring receiver continues to open the 4th timer of duration, the length of described the 4th timer is the twice of second timer length.

18. mobile communication terminal as claimed in claim 17 is characterized in that, described first timer:

Be when the stage of intercepting of discontinuous reception receives the downlink data transmission indication, to start; Perhaps

Be when correct downlink data receiving, determine to send and start after downlink data does not correctly receive indication information to the base station.

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