eNodeB and UE for dynamic cell on and off
Disclosed in some examples are methods, systems, and machine readable mediums which reuse existing LTE functionality to rapidly signal UEs on the availability of a LTE-U cell. Using these techniques the on/off operation can be in the order of a few milliseconds (ms). Several techniques are disclosed herein, including use of component carrier (CC) specific Discontinuous Reception (DRX) signaling, PDCCH signaling, DL assignment based signaling, Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) signaling, Beacon signaling, and the like.
1. An apparatus of an evolved Node B (eNB), the apparatus comprising:
memory; and
processing circuitry, the processing circuitry configured to:
provide a primary cell (P-Cell) on a primary frequency band;
determine that a secondary frequency band is available for use by a secondary cell (S-Cell), wherein the second frequency band is different than the primary frequency band;
encode an information field in a Physical Downlink Control Channel (PDCCH) for transmission to a User Equipment (UE) on the P-Cell, the information field indicating that the S-Cell is available during a specified period of time; and
provide the S-Cell during the specified period of time, the S-Cell including a data channel.
2. The apparatus of claim 1 , wherein the processing circuitry is configured to:
encode the information field in the PDCCH for transmission to the UE on the S-Cell.
3. The apparatus of claim 1 , wherein the information field comprises a binary value, indicating whether the S-Cell is currently available.
4. The apparatus of claim 1 , wherein the information field comprises a binary value, indicating whether the S-Cell is available during the specified period of time.
5. The apparatus of claim 1 , wherein the processing circuitry is configured to:
select a Radio Network Temporary Identifier (RNLI) from a plurality of available RNTIs, the selected RNTI indicating current availability of the S-Cell.
6. The apparatus of claim 5 , wherein the processing circuitry is configured to:
scramble a Cyclic Redundancy Check (CRC) field in the PDCCH using the selected RNTI, the scrambled CRC and the selected RNLI for transmission to the UE, indicating to the UE the current availability of the S-Cell based on the selected RNTI.
7. The apparatus of claim 6 , wherein an absence of a particular RNTI from the scrambled CRC transmission to the UE indicates current unavailability of the S-Cell.
8. The apparatus of claim 1 , wherein the processing circuitry is configured to:
select a Radio Network Temporary Identifier (RNTI) from a plurality of available RNTIs, the selected RNTI indicating current unavailability of the S-Cell.
9. The apparatus of claim 8 , wherein the processing circuitry is configured to:
scramble a Cyclic Redundancy Check (CRC) field in the PDCCH using the selected RNTI, the scrambled CRC and the selected RNTI for transmission to the UE, indicating to the UE the current unavailability of the S-Cell based on the selected RNTI.
10. The apparatus of claim 9 , wherein an absence of a particular RNTI from the scrambled CRC transmission to the UE indicates current availability of the S-Cell.
11. The apparatus of claim 1 , wherein the S-Cell is only provided in a determined timeslot and in one or more other successive timeslots.
12. The apparatus of claim 11 , wherein the determined timeslot is configured in a cell specific manner.
13. The apparatus of claim 1 , wherein the processing circuitry comprises a baseband processor.
14. The apparatus of claim 1 , further comprising a transceiver coupled to one or more antennas, the transceiver configured to transmit to the UE the encoded information field in the PDCCH.
15. A non-transitory machine-readable medium that stores instructions which when performed by a machine, cause the machine to perform operations for signaling a User Equipment (UE) when a cell is available in an unlicensed frequency band, the operations comprising:
providing a primary cell (P-Cell) on a licensed frequency band;
determining that an unlicensed frequency band is available for use by a secondary cell (S-Cell) for a determined time window;
encoding an indication in a Physical Downlink Control Channel (PDCCH) for transmission to a User Equipment (UE) on the P-Cell, that the S-Cell is available for use by the UE for at least a portion of the determined time window; and
providing the S-Cell in the unlicensed frequency band for the determined time window.
16. The machine-readable medium of claim 15 , wherein the determined time window is associated with a current or future time period with a determined timing boundary.
17. The machine-readable medium of claim 15 , wherein the indication comprises a bit field in the PDCCH, the bit field indicating whether the S-Cell is currently available.
18. The machine-readable medium of claim 15 , wherein the indication comprises a bit field in the PDCCH, the bit field indicating whether the S-Cell is available during the determined time window.
19. The machine-readable medium of claim 15 , wherein the operations of encoding the indication comprises building the PDCCH by scrambling a Cyclic Redundancy Check field of the PDCCH using a predetermined Radio Network Temporary Identifier (RNTI) that indicates that the unlicensed frequency band is available for use by the S-CELL.
20. An apparatus of a user equipment (UE), the apparatus comprising:
memory; and
hardware processing circuitry, the hardware processing circuitry configured to:
associate with a primary cell (P-Cell) on a licensed frequency band provided by an Evolved Node-B (eNB);
decode an information field received from the eNB in a Physical Downlink Control Channel (PDCCH) of the P-Cell, the information field indicating that a secondary cell (S-Cell) is available on an unlicensed frequency band during a specified period of time; and
associate with the S-Cell on the unlicensed frequency band for the specified period of time, the S-Cell provided by the eNB.
21. The apparatus of claim 20 , wherein the information field comprises a binary value, indicating that the S-Cell is currently available for association.
22. The apparatus of claim 20 , wherein the information field comprises a binary value, indicating that the S-Cell is unavailable during a second specified period of time.
23. The apparatus of claim 20 , wherein the processing circuitry is configured to:
decode a second information field received from the eNB in a Physical Downlink Control Channel (PDCCH) of the S-Cell, the second information field indicating that the S-Cell is available on an unlicensed frequency band during a second specified period of time.
24. An apparatus of an evolved Node B (eNB), the apparatus comprising:
memory; and
processing circuitry, the processing circuitry configured to:
provide a primary cell (P-Cell) on a primary frequency band;
determine that a secondary frequency band is available for use by a secondary cell (S-Cell), wherein the second frequency band is different than the primary frequency band;
encode an information field in a Physical Downlink Control Channel (PDCCH) for transmission to a User Equipment (UE) on the P-Cell, the information field indicating that the S-Cell is available during a specified period of time;
provide the S-Cell during the specified period of time, the S-Cell including a data channel; and
encode a second information field in the PDCCH for transmission to the UE, the second information field indicating that the S-Cell is not available during a second specified period of time.
25. The apparatus of claim 24 , wherein the processing circuitry is configured to:
encode the second information field in the PDCCH for transmission to the UE on the S-Cell.