Control method for downlink data reception of mobile communication terminal and mobile communication terminal

[0034] In the embodiment of the present invention, considering that the ACK/NACK repetition mechanism is used in the TDD system, the eNB makes a judgment after receiving the last ACK/NACK to decide whether to retransmit the failed data or to send new data. Since the mobile communication terminal starts the HARQ RTT Timer when receiving the downlink data transmission instruction, and then according to whether the downlink data is correctly received, the number of consecutive uplink subframes after the downlink data is reached, and according to the configured number of retransmissions, the base station reports whether there are multiple To correctly receive the indication information ACK or NACK of the downlink data, the eNB will make a decision after receiving the last ACK or NACK. If the decision result is NACK, the downlink data will be retransmitted. Therefore, the best timing duration T1 of the HARQ RTT Timer is three parts The sum of time is calculated according to the following formula:

[0035] T1=kt+T ANRep +Δt (1)

[0036] Among them: t is the duration of a subframe, kt is: the time difference between the mobile communication terminal receiving the downlink data transmission instruction and sending the first feedback indicating whether the downlink data is received correctly;

[0037] T ANRep It is: the sum of the duration from the mobile communication terminal sending the first feedback indication information to the last feedback indication information;

[0038] Δt is the sum of the feedback indication information sent by the mobile communication terminal after being transmitted between the mobile communication terminal and the base station and processed by the base station.

[0039] If the number of subframes is used as the unit, k is the number of subframes between the downlink subframe where the mobile communication terminal receives the downlink data transmission instruction and the uplink subframe where the first feedback instruction information is sent plus 1, that is, for The first feedback indication information of the downlink data sent in the nkth subframe will be sent in the nth subframe; T ANRep It is: the number of subframes between the uplink subframes in which the mobile communication terminal sends the first and last feedback indication information plus two, that is, the number of uplink subframes in which the mobile communication terminal sends the first and last feedback indication information The number of all subframes spanned, including the uplink subframes for sending the first and last feedback indication information; Δt is: the mobile communication terminal sends the last feedback indication information for the uplink subframe and the base station if it retransmits the data if the downlink subframe The number of subframes in the interval is increased by 1. In the prior art, Δt is 3 subframes in length, that is, 3ms, as shown in formula 2:

[0040] T1=kt+T ANRep +3ms (2)

[0041] Such as image 3 As shown, taking 4 retransmissions of ACK or NACK as an example: T1=7+16+3=26ms.

[0042] Such as Figure 4 As shown, in the TDD system, according to the number of retransmissions of the feedback indication information, the different ratios of the uplink and downlink time slots in a radio frame, the position of the uplink subframe where the first feedback indication information is sent, and the repetition of the feedback indication information The number of times is determined, according to the above factors, T ANRep The length of is different, for example:

[0043] The first configuration relationship is that the ratio of uplink and downlink time slots in a radio frame with a period of 5 ms in configuration 0 is 3:1. If the number of retransmissions of the feedback indication information is 2, the position of the uplink subframe that sends the first feedback indication information Is the third subframe, then T ANRep Equal to 2ms;

[0044] It is still the first configuration relationship. If the number of retransmissions of the feedback indication information is 4, the position of the uplink subframe sending the first feedback indication information is the third subframe, and the position of the uplink subframe sending the last feedback indication information is the third subframe. 7 subframes, T ANRep Equal to 6ms;

[0045] It is still the first configuration relationship. If the number of retransmissions of the feedback indication information is 6, the position of the uplink subframe sending the first feedback indication information is the fifth subframe, and the position of the uplink subframe sending the last feedback indication information is the relative position. Next to the fourth subframe of the next radio frame, T ANRep Equal to 10ms;

[0046] Taking the sixth configuration relationship as an example, if the number of retransmissions of the feedback indication information is 4, the position of the uplink subframe sending the first feedback indication information is the third subframe, and the position of the uplink subframe sending the last feedback indication information Is the third subframe of the subsequent fourth radio frame, T ANRep Equal to 41ms;

[0047] Taking the seventh configuration relationship as an example, if the number of retransmissions of the feedback indication information is 6, the position of the uplink subframe sending the first feedback indication information is the fourth subframe, and the position of the uplink subframe sending the last feedback indication information Is the 4th subframe of the next adjacent radio frame, T ANRep Equal to 11ms.

[0048] Calculate T according to the ratio of other time slots, the number of retransmissions, and the location of the uplink subframe that sends the first feedback indication information ANRep The method is exactly the same, and will not be described in detail here.

[0049] Of course, in order to further ensure the reliability of receiving the retransmitted data, the receiver can also be activated a certain subframe in advance. Therefore, the minimum timing duration T2 of the HARQ RTT Timer is calculated according to the following formula 3:

[0050] T2=kt+Nt+Δt+1 (3)

[0051] Where: N is the number of repeated transmissions of the feedback indication information, and t is the duration of one subframe.

[0052] In the embodiment of the present invention, repeated transmission of ACK or NACK is adopted in the TDD system, and the timing duration of HARQ RTTTimer is set to be less than or equal to the length of any single subframe duration multiple between T1 and greater than or equal to T2. It is possible that under the condition of retransmission of the data that arrives in the shortest time, compared with the method of setting the HARQ RTT Timer in the non-repetitive transmission of ACK or NACK, the power consumption of the mobile communication terminal is saved.

[0053] Correspondingly, if the ACK/NACK repetition mechanism is adopted during DRX operation, according to the best technical solution provided by the embodiment of the present invention, there is no need to set the DRX Retransmission Timer to a longer value, which further saves UE power consumption. Even if the best implementation scheme is not adopted, the timing duration of the DRX Retransmission Timer can be appropriately extended according to the specific timing duration of the HARQ RTT Timer.

[0054] Based on the above analysis, such as Figure 5 As shown, an embodiment of the present invention provides a method for controlling downlink data received by a mobile communication terminal in a TDD system, including:

[0055] Step S501: When receiving the downlink data transmission instruction, start the HARQ RTT Timer for monitoring the earliest arrival time of the retransmitted data of the downlink data, and the timing duration of the HARQ RTT Timer is less than or equal to T1 and greater than or equal to T2;

[0056] Step S502: When the time duration of the HARQ RTT Timer arrives, if the mobile communication terminal is in a dormant state, turn on the receiver to wait for the reception of retransmitted data.

[0057] Such as Image 6 As shown, the embodiment of the present invention also provides a mobile communication terminal, including:

[0058] Timer 601 is used to monitor the arrival time of retransmission data of downlink data, and the timing duration is less than or equal to T1 and greater than or equal to T2;

[0059] The receiver 602 is used to receive downlink data;

[0060] The control unit 603 is configured to start the timer 601 when the downlink data transmission instruction is received, and when the timing duration of the timer 601 arrives, if the mobile communication terminal is in a sleep state, turn on the receiver and wait for the reception to be repeated. Transfer data.

[0061] The specific implementation method is as described above, and the description will not be repeated here.

[0062] Obviously, 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. In this way, 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 is also intended to include these modifications and variations.