Method and Apparatus for Configuring Transmission Time Interval, Data Transmission Method and Apparatus and System
This application provides a method and an apparatus for configuring transmission time interval, a data transmission method and apparatus and a system. The method for configuring transmission time interval includes: an eNB transmits to a user equipment configuration information about data radio bearers (DRBs), the configuration information about DRBs indicating TTI length to which each DRB configured by the eNB for the UE is applicable. With the embodiments, multiplexing packets of traffics applicable to different TTI lengths by the user equipment to the same transport block for transmission may be avoided, and occurrence of being unable to fully use resources may also be avoided.
1 . An apparatus for configuring transmission time interval (TTI), applicable to an eNB, the apparatus comprising:
a configuring unit configured to transmit to a user equipment (UE) configuration information about data radio bearers (DRBs), the configuration information about DRBs indicating TTI length to which each DRB configured by the eNB for the UE is applicable.
2 . The apparatus according to claim 1 , wherein the apparatus further comprises:
a scheduling unit configured to schedule one or more uplink grants of the UE, each uplink grant corresponding to one type of TTI length.
3 . The apparatus according to claim 2 , wherein,
the TTI lengths to which the uplink grants correspond are indicated by fields in downlink control information scheduling the uplink grants.
4 . The apparatus according to claim 2 , wherein,
there is a corresponding relationship between the TTI length to which the uplink grant corresponds and a downlink control channel scheduling the uplink grant.
5 . The apparatus according to claim 4 , wherein,
the corresponding relationship between the TTI length to which the uplink grant corresponds and the downlink control channel scheduling the uplink grant is a predefined relationship or is determined by the eNB.
6 . The apparatus according to claim 2 , wherein,
there is a corresponding relationship between the TTI length to which the uplink grant corresponds and a serving cell of the UE to which the uplink grant corresponds.
7 . The apparatus according to claim 6 , wherein,
the corresponding relationship between the TTI length to which the uplink grant corresponds and the serving cell of the UE to which the uplink grant corresponds is determined by the eNB.
8 . The apparatus according to claim 2 , wherein multiple uplink grants are scheduled by one or more downlink control information.
9 . The apparatus according to claim 2 , wherein transmission of uplink data to which each uplink grant corresponds occurs at an m-th TTI starting from the TTI scheduling the uplink grant, the length of the TTI being the TTI length to which the uplink grant corresponds, and m being a predetermined value.
10 . The apparatus according to claim 9 , wherein transmission of uplink data to which uplink grants scheduled at different TTIs correspond temporally overlaps or not.
11 . The apparatus according to claim 1 , wherein the apparatus further comprises:
a notifying unit configured to notify a target eNB of the TTI length to which each DRB of the UE is applicable when the UE needs to be handed over.
12 . A data transmission apparatus, applicable to a UE, the apparatus comprising:
a receiving unit configured to receive configuration information about DRBs transmitted by an eNB, the configuration information about DRBs indicating TTI length to which each DRB configured by the eNB for the UE corresponds;
an establishing unit configured to establish a data processing entity of media access control (MAC) layer and an uplink shared channel corresponding to each TTI length; and
a transmitting unit configured to transmit data using the established data processing entity of MAC layer and the uplink shared channel corresponding to each TTI length according to a received uplink grant.
13 . The apparatus according to claim 12 , wherein the transmitting unit comprises:
a receiving module configured to receive an uplink grant;
a determining module configured to determine TTI length to which the uplink grant corresponds;
a generating module configured to generate a media access control protocol data unit (MAC PDU) by acquiring data from a DRB to which the TTI length corresponds; and
a transmitting module configured to transmit the MAC PDU at an m-th TTI starting from the TTI receiving the uplink grant, length of the TTI being the TTI length to which the uplink grant corresponds, and m being a predetermined value.
14 . The apparatus according to claim 12 , wherein the apparatus further comprises:
a releasing unit configured to release data processing entities of MAC layers and uplink shared channels to which other TTI lengths than a default TTI length correspond when the UE initiates radio resource control (RRC) connection reestablishment.
15 . The apparatus according to claim 12 , wherein the data processing entity of MAC layer comprises:
a logic channel prioritization entity, a multiplexing/demultiplexing entity, and a hybrid automatic repeat request (HARQ) entity.
16 . A communications system, comprising an eNB and a UE, wherein,
the eNB is configured to:
transmit to the UE configuration information about data radio bearers (DRBs), the configuration information about DRBs indicating TTI length to which each DRB configured by the eNB for the UE is applicable;
and the UE is configured to:
receive the configuration information about DRBs transmitted by the eNB;
establish a data processing entity of MAC layer and an uplink shared channel corresponding to each TTI length;
and transmit data using the established data processing entity of MAC layer and the uplink shared channel corresponding to each TTI length according to received uplink grant.