LTE transmission in unlicensed bands
A method of receiving LTE data by a user device, the data being transmitted on a channel of an unlicensed band comprising the steps of receiving a cell ID from a primary LTE cell, receiving system information from the primary LTE cell for access to an unlicensed channel, receiving LTE data on the channel of an unlicensed band.
1. A method of receiving long-term evolution (LTE) data by a user device, the data being transmitted on a channel of an unlicensed band, the method comprising:
receiving a cell ID from a primary LTE cell;
receiving system information from the primary LTE cell for access to an unlicensed channel;
receiving LTE user plane and control plane data on the channel of an unlicensed band; wherein the unlicensed channel is served by a secondary LTE cell identified by the received cell ID and that is of a different eNodeB than the primary LTE cell;
the method further comprising the user device decoding a WiFi header from the channel of the unlicensed band and wherein the user device turns off its LTE in unlicensed spectrum (LTE-U) WiFi capable receiver for a duration specified in the header if the header indicates that the WiFi header has not originated from the secondary LTE cell.
2. The method of claim 1 wherein the cell ID and system information is received as unicast data.
3. The method of claim 1 further comprising
determining from physical downlink control channel (PDCCH) whether an LTE transmission subframe on the unlicensed channel is one of used, partially used and not used.
4. The method of claim 1 wherein the user device determines one or more transmission measurements of the unlicensed channel in relation to transmission on that channel based on used and/or partially used LTE transmission subframes on the unlicensed channel.
5. The method of claim 4 wherein the user device sends data indicative of the one or more transmission and/or channel measurements to the primary cell.
6. The method of claim 1 wherein the user device determines one or more channel measurements of the unlicensed channel in relation to interference and/or noise on that channel based on unused LTE transmission subframes.
7. The method of claim 1 wherein the user device sends its geographical position to the primary LTE cell.
8. The method of claim 1 wherein the user device calculates a timing error based on at least one of cell specific reference signal (RS), user device specific RS and positioning RS.
9. The method of claim 8 wherein a determination is made as to whether a synchronization signal is required, when the user device registers to the primary cell.
10. The method of claim 1 further comprising receiving a synchronization signal through radio resource control (RRC) or media access control (MAC) from the primary cell.
11. A non-transitory computer readable medium comprising instructions that when executed on a processor cause the processor to carry out the method of claim 1 .
12. A user device arranged to carry out the method of claim 1 .
13. A method of receiving long-term evolution (LTE) data by a user device, the data being transmitted on a channel of an unlicensed band, the method comprising:
receiving a cell ID from a primary LTE cell;
receiving system information from the primary LTE cell for access to an unlicensed channel;
receiving LTE user plane and control plane data on the channel of an unlicensed band; wherein the unlicensed channel is served by a secondary LTE cell identified by the received cell ID and that is of a different eNodeB than the primary LTE cell;
the method further comprising the user device determining from LTE downlink control information (DCI) whether a detected WiFi header has originated from the secondary LTE cell, and if it has not originated from the secondary LTE cell, turning off its LTE-U WiFi capable receiver for the rest of the duration specified in the header.
14. The method of claim 13 wherein the cell ID and system information is received as unicast data.
15. The method of claim 13 further comprising
determining from physical downlink control channel (PDCCH) whether an LTE transmission subframe on the unlicensed channel is one of used, partially used and not used.
16. The method of claim 13 wherein the user device determines one or more transmission measurements of the unlicensed channel in relation to transmission on that channel based on used and/or partially used LTE transmission subframes on the unlicensed channel.
17. The method of claim 16 wherein the user device sends data indicative of the one or more transmission and/or channel measurements to the primary cell.
18. The method of claim 13 wherein the user device determines one or more channel measurements of the unlicensed channel in relation to interference and/or noise on that channel based on unused LTE transmission subframes.
19. The method of claim 13 wherein the user device sends its geographical position to the primary LTE cell.
20. The method of claim 13 wherein the user device calculates a timing error based on at least one of cell specific reference signal (RS), user device specific RS and positioning RS.
21. The method of claim 20 wherein a determination is made as to whether a synchronization signal is required, when the user device registers to the primary cell.
22. The method of claim 13 further comprising receiving a synchronization signal through radio resource control (RRC) or media access control (MAC) from the primary cell.
23. A non-transitory computer readable medium comprising instructions that when executed on a processor cause the processor to carry out the method of claim 13 .
24. A user device arranged to carry out the method of claim 13 .