Method and device for enhancing downlink control channel
Embodiments of the disclosure generally relate to enhancement of downlink control channel. A network device maps control information to a resource region. The control information is associated with data to be transmitted at a first subframe of a first cell. The resource region crosses a plurality of subframes and/or a plurality of cells. Then, the network device transmits the control information on the resource region to a terminal device.
1. A method implemented at a network device, comprising:
mapping control information to a resource region, the control information being associated with data to be transmitted at a first subframe of a first cell, and the resource region crossing a plurality of cells; and
transmitting the control information on the resource region to a terminal device, wherein
mapping control information to a resource region comprises: mapping the control information to one or more control channel elements and mapping the one or more control channel elements to resource elements of subframes of the first cell and a second cell, and
mapping the control information to control channel elements comprises:
mapping the control information to the control channel elements based on a self-contained encoding scheme, wherein symbols in the mapped control channel element in each subframe may be decoded independently by the terminal device to obtain the control information, or
mapping the control information to the control channel elements based on a combined encoding scheme, wherein symbols in the mapped control channel element in all subframes are combined before being decoded to obtain the control information.
2. The method of claim 1 , further comprising:
determining a type of the data to be transmitted; and
in response to determining the type belonging to mission critical communication, mapping the control information to the resource region.
3. The method of claim 1 , further comprising:
transmitting, to the terminal device, mapping information about at least one of:
subframes to which the control information is mapped,
cells to which the control information is mapped,
control channel elements or resource elements of subframes to which the control information is mapped,
control channel elements or resource elements of cells to which the control information is mapped,
an encoding scheme used in the mapping,
a numerology of the resource region, and
a search space of the resource region.
4. A network device, comprising:
a processor and a memory, the memory containing program instructions executable by the processor, the processor being configured to cause the network device to perform the method of claim 1 .
5. A method implemented at a terminal device, comprising:
determining a resource region carrying control information, the control information being associated with data transmitted at a first subframe of a first cell, and the resource region crossing a plurality of cells; and
detecting, on the resource region, the control information transmitted from a network device, wherein
detecting the control information comprises:
decoding the control information based on a self-contained encoding scheme, wherein symbols in the mapped control channel element in each subframe may be decoded independently by the terminal device to obtain the control information, or
decoding the control information based on a combined encoding scheme, wherein symbols in the mapped control channel element in all subframes are combined before being decoded to obtain the control information.
6. The method of claim 5 , wherein determining a resource region carrying control information comprises:
receiving, from the network device, mapping information about at least one of:
subframes to which the control information is mapped,
cells to which the control information is mapped,
control channel elements or resource elements of subframes to which the control information is mapped,
control channel elements or resource elements of cells to which the control information is mapped,
an encoding scheme used in the mapping,
a numerology of the resource region, and
a search space of the resource region; and
determining the resource region based on the mapping information.