Methods and apparatus for supporting transmission bursts
Methods and apparatus for supporting transmission bursts in unlicensed spectrum are described. Different sets of sub-bands within a downlink bandwidth portion of unlicensed spectrum can be, and sometimes are, occupied during different DL transmission bursts depending on channel availability. A user device is configured with channel usage information, e.g. N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE, and/or reference signal information. The UE determines the occupied sub-bands in a DL transmission burst over the bandwidth portion, and determines control channel resource information based on the determined occupied sub-channels. The UE determines CSI-RS measurement locations based on determined sub-band occupancy. In some embodiments, the UE performs in-sync and out-of-sync evaluations based BLER threshold scaling factors, which are based on sub-band occupancy.
1. A communications method, the method comprising:
operating a user equipment (UE) device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE, or ii) reference signal information, wherein operating the UE device to receive from the base station information relating to communications channel usage includes operating the UE device to receive said N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device;
operating the UE device to determine which sub-bands of a downlink (DL) band being used by the UE device are occupied, said determination being a sub-band occupancy determination where a sub-band occupancy indicates which sub-bands of a communications band are being used to communicate with the UE device;
operating the UE device to determine from one of the N bitmaps corresponding to the determined sub-bands of the DL band that are occupied, a control resource allocation; and
operating the UE device to perform at least one of: i) determining channel state information-reference signal (CSI-RS) measurement locations based on the determined sub-band occupancy or ii) performing at least one of in-sync (IS) or out-of-sync (OOS) evaluations based on the sub-band occupancy.
2. The method of claim 1 , wherein said method includes, as part of operating a user equipment (UE) device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device, or ii) reference signal information, receiving reference signal information including CSI-RS configuration information indicating CSI-RS configurations, said CSI-RS configurations indicating time and frequency resources used for different sub-band occupancies, where each sub-band occupancy corresponds to a different set of sub-bands which are used by the base station for communication with the UE device.
3. The method of claim 2 , wherein operating the UE device to perform at least one of: i) determining CSI-RS measurement locations based on the determined sub-band occupancy or ii) performing in-sync and out-of-sync evaluations based on the sub-band occupancy includes:
operating the UE device to determine CSI-RS measurement locations based on sub-band occupancy, said step of determining CSI-RSI measurement locations based on sub-band occupancy including operating the UE device to use the determined sub-band occupancy to determine from the received CSI-RS configuration information CSI-RS measurement locations.
4. The method of claim 3 , further comprising:
operating the UE device to perform CSI-RS measurements on the time and frequency resources indicated by the determined CSI-RS measurement locations.
5. The method of claim 1 , wherein operating the UE device to perform at least one of: i) determining CSI-RS measurement locations based on the determined sub-band occupancy or ii) performing in-sync and out-of-sync evaluations based on the sub-band occupancy includes:
performing in-sync evaluations based on the sub-band occupancy.
6. The method of claim 1 , further comprising:
operating the UE device to receive from the base station an indication of sub-band occupancy; and
wherein operating the UE device to determine which sub-bands of a DL band being used by the UE are occupied includes determining which sub-bands of the DL band are occupied from the received indication of sub-band occupancy.
7. The method of claim 1 , further comprising:
operating the UE device to monitor the sub-bands of the DL for reference signals; and
wherein operating the UE device to determine which sub-bands of a DL band being used by the UE are occupied includes:
operating the UE device to determine based on signals received during said monitoring which sub-bands of the DL band are occupied.
8. The method of claim 1 , wherein the DL band corresponds to unlicensed spectrum.
9. A communications method, the method comprising:
operating a user equipment device (UE) to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device, or ii) reference signal information,
wherein operating the UE device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device, or ii) reference signal information, includes:
operating the UE device to receive reference signal information including channel state information-reference signal (CSI-RS) configuration information indicating CSI-RS configurations, said CSI-RS configurations indicating time and frequency resources used for different sub-band occupancies, where each sub-band occupancy corresponds to a different set of sub-bands which are used by the base station for communication with the UE device;
operating the UE device to determine which sub-bands of a downlink (DL) band being used by the UE device are occupied, said determination being a sub-band occupancy determination where a sub-band occupancy indicates which sub-bands of a communications band are being used to communicate with the UE device; and
operating the UE device to perform at least one of: i) determining CSI-RS measurement locations based on the determined sub-band occupancy or ii) performing at least one of in-sync (IS) or out-of-sync (OOS) evaluations based on the sub-band occupancy,
wherein operating the UE device to perform at least one of: i) determining CSI-RS measurement locations based on the determined sub-band occupancy or ii) performing in-sync and out-of-sync evaluations based on the sub-band occupancy includes:
operating the UE device to determine CSI-RS measurement locations based on sub-band occupancy, said step of determining CSI-RSI measurement locations based on sub-band occupancy including operating the UE device to use the determined sub-band occupancy to determine from the received CSI-RS configuration information CSI-RS measurement locations;
operating the UE device to perform CSI-RS measurements on the time and frequency resources indicated by the determined CSI-RS measurement locations;
and wherein performing in-sync evaluations is further based on a Block Error Rate (BLER) threshold scaling factor.
10. The method of claim 9 , further comprising:
operating the UE device to determine the BLER threshold scaling factor to use to perform said in-sync evaluation based on the determined sub-band occupancy.
11. A user equipment (UE) device comprising:
a receiver; and
a processor configured to:
operate the user equipment (UE) device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device, or ii) reference signal information, wherein operating the UE device to receive from the base station information relating to communications channel usage includes operating the UE to receive said N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device;
determine which sub-bands of a downlink (DL) band being used by the UE device are occupied, said determination being a sub-band occupancy determination where a sub-band occupancy indicates which sub-bands of a communications band are being used to communicate with the UE device;
determine from one of the N bitmaps corresponding to the determined sub-bands of the DL band that are occupied, a control resource allocation; and
operate the UE device to perform at least one of: i) determining channel state information-reference signal (CSI-RS) measurement locations based on the determined sub-band occupancy or ii) performing at least one of in-sync (IS) or out-of-sync (OOS) evaluations based on the sub-band occupancy.
12. The UE device of claim 11 , wherein said processor is configured, as part of being configured to operate a user equipment (UE) device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device, or ii) reference signal information, to receive reference signal information including CSI-RS configuration information indicating CSI-RS configurations, said CSI-RS configurations indicating time and frequency resources used for different sub-band occupancies, where each sub-band occupancy corresponds to a different set of sub-bands which are used by the base station for communication with the UE device.
13. The UE device of claim 12 , wherein said processor is configured, as part of being configured to operate the UE device to perform at least one of: i) determining CSI-RS measurement locations based on the determined sub-band occupancy or ii) performing in-sync and out-of-sync evaluations based on the sub-band occupancy, to:
operate the UE device to determine CSI-RS measurement locations based on sub-band occupancy, said step of determining CSI-RSI measurement locations based on sub-band occupancy including operating the UE device to use the determined sub-band occupancy to determine from the received CSI-RS configuration information CSI-RS measurement locations.
14. The UE device of claim 13 , wherein said processor is further configured to:
operate the UE device to perform CSI-RS measurements on the time and frequency resources indicated by the determined CSI-RS measurement locations.
15. The UE device of claim 11 , wherein said processor is configured, as part of being configured to operate the UE device to perform at least one of: i) determining CSI-RS measurement locations based on the determined sub-band occupancy or ii) performing in-sync and out-of-sync evaluations based on the sub-band occupancy, to:
perform in-sync evaluations based on the sub-band occupancy.
16. The UE device of claim 11 , wherein said processor is further configured to:
operate the UE device to receive from the base station an indication of sub-band occupancy; and
wherein said processor is configured, as part of being configured to operate the UE to determine which sub-bands of a DL band being used by the UE device are occupied, to determine which sub-bands of the DL band are occupied from the received indication of sub-band occupancy.
17. The UE device of claim 11 , wherein said processor is further configured to:
operate the UE device to monitor the sub-bands of the DL for reference signals; and
wherein, said processor is configured, as part of being configured to operate the UE device to determine which sub-bands of a DL band being used by the UE device are occupied, to operate the UE device to determine based on signals received during said monitoring which sub-bands of the DL band are occupied.
18. A user equipment (UE) device comprising:
a receiver; and
a processor configured to:
operate the user equipment (UE) device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE, or ii) reference signal information;
determine which sub-bands of a DL downlink (DL) band being used by the UE device are occupied, said determination being a sub-band occupancy determination where a sub-band occupancy indicates which sub-bands of a communications band are being used to communicate with the UE device; and
operate the UE device to perform at least one of: i) determining channel state information-reference signal (CSI-RS) measurement locations based on the determined sub-band occupancy or ii) performing at least one of in-sync (IS) or out-of-sync (OOS) evaluations based on the sub-band occupancy; and
wherein said processor is configured, as part of being configured to operate a user equipment (UE) device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device, or ii) reference signal information, to receive reference signal information including CSI-RS configuration information indicating CSI-RS configurations, said CSI-RS configurations indicating time and frequency resources used for different sub-band occupancies, where each sub-band occupancy corresponds to a different set of sub-bands which are used by the base station for communication with the UE device;
wherein said processor is configured, as part of being configured to operate the UE device to perform at least one of: i) determining CSI-RS measurement locations based on the determined sub-band occupancy or ii) performing in-sync and out-of-sync evaluations based on the sub-band occupancy, to operate the UE device to determine CSI-RS measurement locations based on sub-band occupancy, said step of determining CSI-RSI measurement locations based on sub-band occupancy including operating the UE device to use the determined sub-band occupancy to determine from the received CSI-RS configuration information CSI-RS measurement locations;
wherein said processor is further configured to: operate the UE device to perform CSI-RS measurements on the time and frequency resources indicated by the determined CSI-RS measurement locations;
wherein said processor is configured, as part of being configured to perform in-sync evaluations, to base the in-sync evaluation on a Block Error Rate (BLER) threshold scaling factor; and
wherein said processor is further configured to determine the BLER threshold scaling factor to use to perform said in-sync evaluation based on the determined sub-band occupancy.
19. A non-transitory computer readable medium including computer executable instructions which when executed by a processor control a user equipment (UE) device using unlicensed spectrum to perform the steps of:
operating the UE device to receive from a base station information relating to communications channel usage, said information including one or more of: i) N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device, or ii) reference signal information, wherein operating the UE device to receive from the base station information relating to communications channel usage includes operating the UE device to receive said N bitmaps, each bitmap indicating a different control channel resource allocation that may be used for communication with the UE device;
operating the UE device to determine which sub-bands of a downlink (DL) band being used by the UE device are occupied, said determination being a sub-band occupancy determination where a sub-band occupancy indicates which sub-bands of a communications band are being used to communicate with the UE device;
operating the UE device to determine from one of the N bitmaps corresponding to the determined sub-bands of the DL band that are occupied, a control resource allocation; and
operating the UE device to perform at least one of: i) determining channel state information-reference signal (CSI-RS) measurement locations based on the determined sub-band occupancy or ii) performing at least one of in-sync (IS) or out-of-sync (OOS) evaluations based on the sub-band occupancy.