Method and apparatus for determining repetition quantity of downlink control channel
Embodiments of the present invention provide a method and an apparatus for determining a repetition quantity of a downlink control channel, which relate to the radio communications field. The method includes: acquiring processing information corresponding to a repetition quantity of a downlink control channel; and sending the downlink control channel to user equipment UE according to the processing information, where the downlink control channel is used to carry processed downlink control information, so that the UE determines the repetition quantity of the downlink control channel according to the processing information. The apparatus includes a first acquisition module and a sending module. In the present invention, a repetition quantity sent by a network side is the same as a repetition quantity detected by UE.
1. An apparatus for determining a repetition quantity of a downlink control channel, wherein the apparatus comprises:
a receiver, configured to receive downlink control information carried on a downlink control channel, wherein the downlink control information is processed by a parameter corresponding to a repetition quantity of the downlink control channel; and
a processor, configured to:
determine the repetition quantity of the downlink control channel according to the downlink control information;
for any repetition quantity in multiple stored repetition quantities, perform, according to a scrambling sequence corresponding to the repetition quantity, descrambling on the processed downlink control information carried on the downlink control channel;
perform verification on the descrambled downlink control information according to cyclic redundancy check (CRC) bits corresponding to the downlink control information carried on the downlink control channel;
determine the repetition quantity as the repetition quantity of the downlink control channel in a case that the verification succeeds; and
perform, according to a mask corresponding to the repetition quantity, an antenna selection mask, and a radio network temporary identifier (RNTI), descrambling on the scrambled CRC bits in the processed downlink control information carried on the downlink control channel.
2. The apparatus according to claim 1 , wherein the processor is further configured to:
multiply, bit by bit, a symbol corresponding to the processed downlink control information carried on the downlink control channel and the scrambling sequence corresponding to the repetition quantity, to obtain the descrambled downlink control information.
3. The apparatus according to claim 1 , wherein the processor is further configured to:
for any repetition quantity in multiple stored repetition quantities, acquire the corresponding downlink control channel according to a subframe set corresponding to the repetition quantity;
perform detection on the acquired downlink control channel; and
if the detection succeeds, determine the repetition quantity as the repetition quantity of the downlink control channel.
4. The apparatus according to claim 3 , wherein subframe sets corresponding to the multiple stored repetition quantities comprise at least one non-overlapping subframe.
5. The apparatus according to claim 1 , wherein the processor is further configured to:
acquire a repetition quantity of a data channel according to the repetition quantity of the downlink control channel from a stored correspondence between the repetition quantity of the downlink control channel and the repetition quantity of the data channel; and
perform data transmission according to the repetition quantity of the data channel.
6. The apparatus according to claim 5 , wherein the receiver is configured to:
receive the stored correspondence between the repetition quantity of the downlink control channel and the repetition quantity of the data channel.
7. A method for determining a repetition quantity of a downlink control channel, wherein the method comprises:
receiving downlink control information carried on a downlink control channel, wherein the downlink control information is processed by a parameter corresponding to a repetition quantity of the downlink control channel; and
determining the repetition quantity of the downlink control channel according to the downlink control information;
wherein the determining the repetition quantity of the downlink control channel according to the downlink control information comprises:
for any repetition quantity in multiple stored repetition quantities, performing, according to a scrambling sequence corresponding to the repetition quantity, descrambling on the processed downlink control information carried on the downlink control channel;
performing verification on the descrambled downlink control information according to cyclic redundancy check (CRC) bits corresponding to the downlink control information carried on the downlink control channel; and
if the verification succeeds, determining the repetition quantity as the repetition quantity of the downlink control channel;
wherein the performing, according to a scrambling sequence corresponding to the repetition quantity, descrambling on the processed downlink control information carried on the downlink control channel comprises:
performing, according to a mask corresponding to the repetition quantity, an antenna selection mask, and a radio network temporary identifier (RNTI), descrambling on the scrambled CRC bits in the processed downlink control information carried on the downlink control channel.
8. The method according to claim 7 , wherein the performing, according to the scrambling sequence corresponding to the repetition quantity, descrambling on the processed downlink control information carried on the downlink control channel comprises:
multiplying, bit by bit, a symbol corresponding to the processed downlink control information carried on the downlink control channel and a scrambling sequence corresponding to the repetition quantity, to obtain the descrambled downlink control information.
9. The method according to claim 7 , wherein the determining the repetition quantity of the downlink control channel according to the downlink control information comprises:
for any repetition quantity in multiple stored repetition quantities, acquiring the corresponding downlink control channel according to a subframe set corresponding to the repetition quantity;
performing detection on the acquired downlink control channel; and
if the detection succeeds, determining the repetition quantity as the repetition quantity of the downlink control channel.
10. The method according to claim 9 , wherein subframe sets corresponding to the multiple stored repetition quantities comprise at least one non-overlapping subframe.
11. The method according to claim 7 , wherein the method further comprises:
acquiring a repetition quantity of a data channel according to the repetition quantity of the downlink control channel from a stored correspondence between the repetition quantity of the downlink control channel and the repetition quantity of the data channel; and
according to the repetition quantity of the data channel, receiving a downlink data channel or sending an uplink data channel.
12. The method according to claim 11 , wherein before the acquiring a repetition quantity of a data channel according to the repetition quantity of the downlink control channel from a stored correspondence between the repetition quantity of the downlink control channel and the repetition quantity of the data channel, further comprising:
receiving the stored correspondence between the repetition quantity of the downlink control channel and the repetition quantity of the data channel.