Base station, terminal, and communication method
View Patent ↗In a base station, a signal allocating unit allocates downlink control signals (DCI) to a control channel region (CORESET) constituted by a plurality of control channel elements (CCEs), and a transmitting unit transmits the downlink control signals. In this case, the number of resource element groups (REGs) that constitute the CCE is a power of 2, and a bundling size indicating the number of REGs included in the REGs that constitute the CCE and arranged in adjacent resource blocks is a power of 2.
1. A communication apparatus, comprising:
a receiver, which, in operation, receives downlink control signals in a control channel region formed of a plurality of control channel elements (CCEs); and
circuitry, which is coupled to the receiver and which, in operation, demodulates the downlink control signals,
wherein each of the plurality of CCEs is formed of a plurality of resource element group (REG) bundles, and a number of REGs included in each of the plurality of REG bundles is different according to a number of symbols in which the control channel region is arranged, and
wherein one of the plurality of CCEs is formed of six (6) REGs, which are bundled into the plurality of REG bundles forming the CCE depending on the number of symbols in which the control channel region is arranged.
2. The communication apparatus according to claim 1 , wherein the number of symbols in which the control channel region is arranged is indicated by a higher layer signaling.
3. The communication apparatus according to claim 1 , wherein in case the number of symbols in the control channel region is two or more, each of the plurality of CCEs is assigned over a plurality of symbols of the control channel region.
4. The communication apparatus according to claim 1 , wherein a number of REGs is the same in each symbol of the control channel region, irrespective of an aggregation level.
5. The communication apparatus according to claim 1 , wherein a common demodulation reference signal (DMRS) is used in each of the plurality of REG bundles.
6. The communication apparatus according to claim 1 , wherein the REG is formed of one symbol within a physical resource block (PRB).
7. The communication apparatus according to claim 1 , wherein a plurality of REGs included in each of the plurality of REG bundles are adjacent to each other.
8. A communication method comprising:
receiving downlink control signals in a control channel region formed of a plurality of control channel elements (CCEs); and
demodulating the downlink control signals,
wherein each of the plurality of CCEs is formed of a plurality of resource element group (REG) bundles, and a number of REGs included in each of the plurality of REG bundles is different according to a number of symbols in which the control channel region is arranged,
wherein one of the plurality of CCEs is formed of six (6) REGs, which are bundled into the plurality of REG bundles forming the CCE depending on the number of symbols in which the control channel region is arranged.
9. The communication method according to claim 8 , wherein the number of symbols in which the control channel region is arranged is indicated by a higher layer signaling.
10. The communication method according to claim 8 , wherein in case the number of symbols in the control channel region is two or more, each of the plurality of CCEs is assigned over a plurality of symbols of the control channel region.
11. The communication method according to claim 8 , wherein a number of REGs is the same in each symbol of the control channel region, irrespective of an aggregation level.
12. The communication method according to claim 8 , wherein a common demodulation reference signal (DMRS) is used in each of the plurality of REG bundles.
13. The communication method according to claim 8 , wherein the REG is formed of one symbol within a physical resource block (PRB).
14. The communication method according to claim 8 , wherein a plurality of REGs included in each of the plurality of REG bundles are adjacent to each other.
15. A communication apparatus comprising:
circuitry, which, in operation, assigns downlink control signals in a control channel region formed of a plurality of control channel elements (CCEs); and
a transmitter, which is coupled to the circuitry and which, in operation, transmits the downlink control signals,
wherein each of the plurality of CCEs is formed of a plurality of resource element group (REG) bundles, and a number of REGs included in each of the plurality of REG bundles is different according to a number of symbols in which the control channel region is arranged, and
wherein one of the plurality of CCEs is formed of six (6) REGs, which are bundled into the plurality of REG bundles forming the CCE depending on the number of symbols in which the control channel region is arranged.
16. The communication apparatus according to claim 15 , wherein the number of symbols in which the control channel region is arranged is indicated by a higher layer signaling.
17. The communication apparatus according to claim 15 , wherein in case the number of symbols in the control channel region is two or more, each of the plurality of CCEs is assigned over a plurality of symbols of the control channel region.
18. The communication apparatus according to claim 15 , wherein a number of REGs is the same in each symbol of the control channel region, irrespective of an aggregation level.
19. The communication apparatus according to claim 15 , wherein a common demodulation reference signal (DMRS) is used in each of the plurality of REG bundles.
20. The communication apparatus according to claim 15 , wherein the REG is formed of one symbol within a physical resource block (PRB).
21. The communication apparatus according to claim 15 , wherein a plurality of REGs included in each of the plurality of REG bundles are adjacent to each other.
22. A communication method comprising:
assigning downlink control signals in a control channel region formed of a plurality of control channel elements (CCEs); and
transmitting the downlink control signals,
wherein each of the plurality of CCEs is formed of a plurality of resource element group (REG) bundles, and a number of REGs included in each of the plurality of REG bundles is different according to a number of symbols in which the control channel region is arranged, and
wherein one of the plurality of CCEs is formed of six (6) REGs, which are bundled into the plurality of REG bundles forming the CCE depending on the number of symbols in which the control channel region is arranged.
23. The communication method according to claim 22 , wherein the number of symbols in which the control channel region is arranged is indicated by a higher layer signaling.
24. The communication method according to claim 22 , wherein in case the number of symbols in the control channel region is two or more, each of the plurality of CCEs is assigned over a plurality of symbols of the control channel region.
25. The communication method according to claim 22 , wherein a number of REGs is the same in each symbol of the control channel region, irrespective of an aggregation level.
26. The communication method according to claim 22 , wherein a common demodulation reference signal (DMRS) is used in each of the plurality of REG bundles.
27. The communication method according to claim 22 , wherein the REG is formed of one symbol within a physical resource block (PRB).
28. The communication method according to claim 22 , wherein a plurality of REGs included in each of the plurality of REG bundles are adjacent to each other.