ENODEB and UE for dynamic cell on and off
View Patent ↗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 eNodeB, comprising:
hardware processing circuitry configured to:
provide a primary cell (P-Cell) on a primary frequency band during a first time slot;
determine that a secondary frequency band is available for use by a secondary cell (S-Cell) during a second time slot, the second time slot being a subsequent time slot to the first time slot and the second frequency band being different than the primary frequency band; and
transmit an indication to a User Equipment (UE) during the first time slot, that the S-Cell is available for association after the first time slot and during the determined subsequent time slot, the subsequent time slot being associated with a timing boundary defining a beginning time and an end time of the subsequent time slot; and
an S-Cell module configured to:
provide the S-Cell during the subsequent time slot, the S-Cell including a data channel.
2. The eNodeB of claim 1 , wherein the indication is a Radio Resource Control (RRC) message specifying a Discontinuous Reception (DRX) cycle which instructs the UE to access the S-Cell during the determined subsequent time slot.
3. The eNodeB of claim 1 , wherein the indication is located in a Physical Downlink Control Channel (PDCCH).
4. The eNodeB of claim 3 , wherein the indication is a bit field in the PDCCH.
5. The eNodeB of claim 3 , wherein the indication is located in a Physical Hybrid-ARQ Indicator Channel (PHICH).
6. The eNodeB of claim 1 , wherein the indication is located in a beacon signal.
7. The eNodeB of claim 1 , wherein the indication is located in a physical downlink shared channel (PDSCH) associated with the P-Cell.
8. The eNodeB of claim 1 , wherein the S-Cell is only provided in the determined timeslot and in one or more other successive timeslots.
9. The eNodeB of claim 1 , wherein the determined timeslot is configured in a cell specific manner.
10. 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, the time window associated with a current or future time period with a determined timing boundary;
sending an indication to the UE that the unlicensed frequency band is available for use by the S-Cell, the indication signaling the UE that the frequency band is available for use by the UE for at least a portion of the determined time window; and
providing the S-Cell in the frequency band for the determined time window.
11. The machine-readable medium of claim 10 , wherein the indication is a Radio Resource Control (RRC) message specifying a Discontinuous Reception (DRX) cycle which instructs the UE to access the S-Cell during the determined time window.
12. The machine-readable medium of claim 10 , wherein the indication is located in a Physical Downlink Control Channel (PDCCH).
13. The machine-readable medium of claim 12 , wherein the indication is a bit field in the PDCCH.
14. The machine-readable medium of claim 12 , wherein the operations of sending 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.
15. The machine-readable medium of claim 12 , wherein the operations of sending the indication comprises scheduling a Physical Downlink Shared Channel (PDSCH) of the S-Cell on the PDCCH, the PDCCH sent on the P-Cell.
16. The machine-readable medium of claim 12 , wherein the operations of sending the indication comprises scheduling a Physical Downlink Shared Channel (PDSCH) of the S-Cell on the PDCCH, the PDCCH sent on the S-Cell.
17. The machine-readable medium of claim 10 , wherein the indication is located in a Physical Hybrid-ARQ Indicator Channel (PHICH).
18. The machine-readable medium of claim 10 , wherein the indication is located in a beacon signal.
19. A user equipment (UE), 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 eNodeB;
receive an indication on the P-Cell that a secondary cell (S-Cell) is available on an unlicensed frequency band at a particular time period defined by a particular timing boundary; and
associate with the S-Cell on the unlicensed frequency band for the particular time period, the S-Cell provided by the eNodeB.
20. The UE of claim 19 , wherein the indication is a Radio Resource Control (RRC) message specifying a Discontinuous Reception (DRX) cycle.
21. The UE of claim 19 , wherein the indication is located in a Physical Downlink Control Channel (PDCCH).
22. The UE of claim 19 , wherein the indication is located in a Physical Hybrid-Automatic Repeat Request (ARQ) Indicator Channel (PHICH).
23. The UE of claim 19 , wherein the indication is located in a beacon signal.