Flexible short Transmission Time Interval (TTI) resource allocation
A network node, wireless device and methods for short transmission time interval, sTTI, resource allocation in a communication network are provided. The network node includes processing circuitry configured to determine a downlink control information, DCI, message. The DCI message includes a bit field of at least two bits. Each bit corresponds to a group of at least one short Control Channel Element, sCCE, of a configured sPDCCH region. The processing circuitry is configured to transmit the DCI message to a wireless device. The bit field indicates whether the group of at least one sCCE is used for data transmission to the wireless device.
1. A network node for short transmission time interval, sTTI, resource allocation in a communication network, the network node comprising:
processing circuitry configured to:
determine a downlink control information, DCI, message, the DCI message including a bit field of at least two bits, each bit corresponding to a group of at least one short Control Channel Element, sCCE, of a configured short Physical Downlink Control Channel, sPDCCH, region; and
transmit the DCI message to a wireless device; and
the bit field indicating whether the group of at least one sCCE is used for data transmission to the wireless device.
2. The network node of claim 1 , wherein the data transmission is short Physical Downlink Shared Channel, sPDSCH, data transmission.
3. The network node of claim 1 , wherein at least a portion of the configured sPDCCH region is used for short Physical Downlink Shared Channel, sPDSCH, data transmission.
4. The network node of claim 1 , wherein each group of the at least one sCCE corresponds to a same quantity of sCCEs.
5. The network node of claim 1 , wherein each bit corresponds to a respective group of non-overlapping sCCEs.
6. The network node of claim 1 , wherein the group of at least one sCCE corresponds to a sCCE for transmission of the DCI message and at least one sCCE for the data transmission.
7. The network node of claim 1 , wherein each sCCE has a respective sCCE index; and
a mapping of the at least two bits to sCCE indices is based on a number of bits and size of the configured sPDCCH region.
8. The network node of claim 1 , wherein each sCCE has a respective sCCE index; and
a mapping of the at least two bits to sCCE indices is based on a predefined mapping.
9. The network node of claim 1 , wherein a grouping of sCCEs is based on a location and aggregation level of a sPDCCH candidate associated with the DCI message.
10. The network node of claim 1 , wherein the wireless device shares the sPDCCH region with a second wireless device.
11. The network node of claim 1 , wherein an assignment of sPDCCH candidates for each wireless device is spread out over the sPDCCH region.
12. A method for a network node for short transmission time interval, sTTI, resource allocation in a communication network, the method comprising:
determining a downlink control information, DCI, message, the DCI message including a bit field of at least two bits, each bit corresponding to a group of at least one short Control Channel Element, sCCE, of a configured short Physical Downlink Control Channel, sPDCCH, region; and
transmitting the DCI message to a wireless device; and
the bit field indicating whether the group of at least one sCCE is used for data transmission to the wireless device.
13. A wireless device for short transmission time interval, sTTI, resource allocation in a communication network, the wireless device comprising:
processing circuitry configured to:
receive a downlink control information, DCI, message, the DCI message including a bit field of at least two bits, each bit corresponding to a group of at least one short Control Channel Element, sCCE, of a configured short Physical Downlink Control Channel, sPDCCH, region; and
determine whether the group of at least one sCCE is used for data transmission based at least in part on the bit field of the DCI message.
14. The wireless device of claim 13 , wherein the data transmission is short Physical Downlink Shared Channel, sPDSCH, data transmission.
15. The wireless device of claim 13 , wherein at least a portion of the configured sPDCCH region is used for short Physical Downlink Shared Channel, sPDSCH, data transmission.
16. The wireless device of claim 13 , wherein each group of the at least one sCCE corresponds to a same quantity of sCCEs.
17. The wireless device of claim 13 , wherein each bit corresponds to a respective group of non-overlapping sCCEs.
18. The wireless device of claim 13 , wherein the group of at least one sCCE corresponds to a sCCE for transmission of the DCI message and at least one sCCE for the data transmission.
19. The wireless device of claim 13 , wherein each sCCE has a respective sCCE index; and
a mapping of the at least two bits to sCCE indices is based on a number of bits and size of the configured sPDCCH region.
20. The wireless device of claim 13 , wherein each sCCE has a respective sCCE index; and
a mapping of the at least two bits to sCCE indices is based on a predefined mapping.
21. The wireless device of claim 13 , wherein a grouping of sCCEs is based on a location and aggregation level of a sPDCCH candidate associated with the DCI message.
22. The wireless device of claim 13 , wherein the wireless device shares the sPDCCH region with another wireless device.
23. The wireless device of claim 13 , wherein an assignment of sPDCCH candidates for each wireless device is spread out over the sPDCCH region.
24. A method for a wireless device for short transmission time interval, sTTI, resource allocation in a communication network, the method comprising:
receiving a downlink control information, DCI, message, the DCI message including a bit field of at least two bits, each bit corresponding to a group of at least one short Control Channel Element, sCCE, of a configured short Physical Downlink Control Channel, sPDCCH, region; and
determining whether the group of at least one sCCE is used for data transmission based at least in part on the bit field of the DCI message.