Method and apparatus for configuring transmission time interval in mobile communication system
Disclosed herein is a base station of a mobile communication system configuring at least one low latency transmission time interval (TTI) within a length of at least one transmission symbol in a subframe including a plurality of transmission symbols and transmitting LL (low latency) TTI related information using a physical control format indicator channel (PCFICH) transmitted at a pre-defined transmission symbol position within the subframe.
1. A method for configuring a transmission time interval (TTI) in a base station of a mobile communication system, comprising:
configuring at least one LL (low latency) TTI, with a length of at least one transmission symbol and shorter than a length of one subframe, in a subframe including a plurality of transmission symbols;
transmitting LL (low latency) TTI related information using a control format indicator (CFI) of N bits larger than 2 bits of a physical control format indicator channel (PCFICH) transmitted at a defined transmission symbol position within the subframe;
wherein the CFI includes:
first CFI values of M bits among the N bits representing a number of transmission symbols within the LL TTI, and
second CFI values of L bits among the N bits representing configuration information of a control region and a data region within the LL TTI.
2. The method of claim 1 , wherein:
the configuring at least one LL TTI includes configuring a control region and a data region within the LL TTI which are changed in units of LL TTI.
3. The method of claim 2 , wherein:
the configuring at least one LL TTI further includes dividing the control region and the data region in the at least one LL TTI into a frequency domain or a time domain.
4. An apparatus for configuring a transmission time interval in a mobile communication system, comprising:
a processor configuring at least one low latency transmission time interval (TTI), with a length of at least one transmission symbol and shorter than a length of one subframe, in a subframe including a plurality of transmission symbols; and
a transceiver transmitting LL (low latency) TTI related information using a control format indicator (CFI) of N bits larger than 2 bits of a physical control format indicator channel (PCFICH) transmitted at a defined transmission symbol position within the subframe;
wherein the CFI includes:
first CFI values of M bits among the N bits representing number of transmission symbols within the LL TTI, and
second CFI values of L bits among the N bits representing configuration information of a control region and a data region within the LL TTI
the PCFICH at a predefined transmission symbol position within the subframe.
5. The apparatus of claim 4 , wherein:
the processor indicates duration in which the CFI is applied using other some of the remaining unused bits of the N bits.
6. The apparatus of claim 4 , wherein:
the processor indicates a division scheme of the control region and the data region using other some of the remaining unused bits of the N bits, and
the division scheme includes a division scheme in a frequency domain and a division scheme in a time domain.
7. The apparatus of claim 4 , wherein:
the processor changes configuration of a control region and a data region within LL TTI in at least one LL TTI unit.
8. The apparatus of claim 4 , wherein:
the processor identically configures a control region and a data region within the LL TTI during the at least one LL TTI, and
the number of LL TTIs within the subframe and the configurations of the control region and the data region within the LL TTI are changed for each subframe.