Downlink control channel in wireless systems
Systems, methods, and instrumentalities may be disclosed for implementing a flexible radio access communication system. A flexible radio access communication system may be supported using spectrum of varying size, including aggregation of non-adjacent carriers in the same and/or in different frequency bands. A wireless transmit/receive unit (WTRU) may receive a first transmission via a common downlink control channel. The first transmission may include first control information. The first control information may include information regarding the configuration of a first dedicated downlink control channel of one or more dedicated control channels. The WTRU may receive a second transmission via the first dedicated downlink control channel of the dedicated control channels. The second transmission may include second control information. The second control information may be associated with a transmission of a first transmission type. The dedicated downlink control channels may be used for providing control information associated with different types of transmissions.
1. A network element associated with a base station, the network element configured to:
transmit a first downlink control channel transmission within a first bandwidth region, wherein the first bandwidth region is 1) a subset of a system bandwidth and 2) was used by a wireless transmit/receive unit (WTRU) when initially accessing the network element;
transmit configuration information related to: 1) a second downlink control channel transmission associated with a second bandwidth region of the system bandwidth and 2) a set of search spaces associated with the second bandwidth region; and
transmit the second downlink control channel transmission within the second bandwidth region.
2. The network element of claim 1 , wherein the configuration information related to the second downlink control channel transmission is associated with any of: a waveform, a numerology, a resource element type, a resource block type, or a control channel type.
3. The network element of claim 2 , wherein the numerology comprises any of: a subcarrier spacing, a time symbol length, or a cyclic prefix.
4. The network element of claim 1 , wherein the network element is further configured to transmit an indication in the first downlink control channel transmission.
5. The network element of claim 1 , wherein each of the first and second bandwidth regions is associated with a respective set of contiguous physical resource blocks.
6. The network element of claim 1 , wherein the first downlink control channel transmission is a common control channel transmission, and the second downlink control channel transmission is a dedicated control channel transmission.
7. The network element of claim 1 , wherein the configuration information indicates a time and frequency location of the second downlink control channel transmission associated with the second bandwidth region.
8. The network element of claim 1 , wherein the first and second bandwidth regions are each associated with a different numerology.
9. The network element of claim 1 , wherein the configuration information is transmitted using radio resource control signaling.
10. The network element of claim 1 , wherein the configuration information indicates a first set of search spaces associated with the first bandwidth region is different from a second set of search spaces associated with the second bandwidth region.
11. The network element of claim 1 , wherein the configuration information indicates any of: a first subcarrier spacing associated with the first bandwidth region is different from a second subcarrier spacing associated with the second bandwidth region, or a first cyclic prefix associated with the first bandwidth region is different from a second cyclic prefix associated with the second bandwidth region.
12. A method implemented by a network element associated with a base station, the method comprising:
transmitting a first downlink control channel transmission within a first bandwidth region, wherein the first bandwidth region is 1) a subset of a system bandwidth and 2) was used by a wireless transmit/receive unit (WTRU) when initially accessing the base network element;
transmitting configuration information related to: 1) a second downlink control channel transmission associated with a second bandwidth region of the system bandwidth and 2) a set of search spaces associated with the second bandwidth region; and
transmitting the second downlink control channel transmission within the second bandwidth region.
13. The method of claim 12 , wherein the configuration information related to the second downlink control channel transmission is associated with any of: a waveform, a numerology, a resource element type, a resource block type, or a control channel type.
14. The method of claim 13 , wherein the numerology comprises any of: a subcarrier spacing, a time symbol length, or a cyclic prefix.
15. The method of claim 12 , wherein each of the first and second bandwidth regions is associated with a respective set of contiguous physical resource blocks.
16. The method of claim 12 , wherein the first downlink control channel transmission is a common control channel transmission, and the second downlink control channel transmission is a dedicated control channel transmission.
17. The method of claim 12 , wherein the configuration information indicates a time and frequency location of the second downlink control channel transmission associated with the second bandwidth region.
18. The method of claim 12 , wherein the first and second bandwidth regions are each associated with a different numerology.
19. The method of claim 12 , wherein the configuration information is transmitted using radio resource control signaling.
20. The method of claim 12 , wherein the configuration information indicates any of:
a first set of search spaces associated with the first bandwidth region is different from a second set of search spaces associated with the second bandwidth region,
a first subcarrier spacing associated with the first bandwidth region is different from a second subcarrier spacing associated with the second bandwidth region, or
a first cyclic prefix associated with the first bandwidth region is different from a second cyclic prefix associated with the second bandwidth region.