Signal indication for flexible new radio (NR) long term evolution (LTE) coexistence
A New Radio (NR) control signal that indicates one or more Long Term Evolution (LTE) network parameters may be transmitted to NR UEs to enable the NR UEs to identify which resources carry LTE signal(s). The NR UEs may then receive one or more NR downlink signals over remaining resources in a set of resources without processing those resources that carry LTE signal(s). The NR downlink signals may have a zero power level, or otherwise be blanked, over resources that carry the LTE signal(s).
1. A method comprising:
receiving, by a User Equipment (UE), a New Radio (NR) Radio Resource Control (RRC) signal indicating a Long Term Evolution (LTE) network parameter; and
receiving, by the UE, an NR downlink signal over one or more resources in a set of resources, the set of resources comprising a subset of resources reserved for an LTE signal, the subset of resources being indicated by the LTE network parameter, and the one or more resources excluding the subset of resources in the set of resources.
2. The method of claim 1 , wherein the set of resources includes at least some resources that are allocated to the UE.
3. The method of claim 1 , wherein the NR downlink signal is rate matched around the subset of resources reserved for the LTE signal, and wherein the NR downlink signal is rate matched at the resource element (RE) level such that the subset of resources around which the NR downlink signal is rate matched consists of an integer number of REs.
4. The method of claim 1 , wherein the LTE network parameter is an LTE antenna port, and the method further comprises identifying the subset of resources reserved for the LTE signal based on an LTE cell-specific reference signal (CRS) pattern associated with the LTE antenna port.
5. The method of claim 1 , wherein the LTE network parameter is a frequency offset, and the method further comprises identifying the subset of resources reserved for the LTE signal based on the frequency offset.
6. The method of claim 5 , wherein the frequency offset is associated with an LTE cell specific reference signal (CRS).
7. The method of claim 1 , wherein the LTE network parameter is an LTE Multicast-Broadcast Single-Frequency Network (MBSFN) configuration, and the method further comprises identifying the subset of resources reserved for the LTE signal based on an LTE subframe configuration indicated by the LTE MBSFN configuration.
8. The method of claim 1 , wherein receiving the NR downlink signal comprises:
receiving one or more NR downlink signals over the one or more resources, the one or more NR downlink signals having zero power levels over the subset of resources reserved for the LTE signal, wherein the one or more NR downlink signals include an NR signal transmitted over a Physical Downlink Shared Channel (PDSCH).
9. A User Equipment (UE) comprising:
a processor; and
a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
receive a New Radio (NR) Radio Resource Control (RRC) signal indicating a Long Term Evolution (LTE) network parameter; and
receive an NR downlink signal over one or more resources in a set of resources, the set of resources comprising a subset of resources reserved for an LTE signal, the subset of resources being indicated by the LTE network parameter, and the one or more resources excluding the subset of resources in the set of resources.
10. The UE of claim 9 , wherein the set of resources includes at least some resources that are allocated to the UE.
11. The UE of claim 9 , wherein the NR downlink signal is rate matched around the subset of resources reserved for the LTE signal, and wherein the NR downlink signal is rate matched at the resource element (RE) level such that the subset of resources around which the NR downlink signal is rate matched consists of an integer number of REs.
12. The UE of claim 9 , wherein the LTE network parameter is an LTE antenna port, and the programming further includes instructions to identify the subset of resources reserved for the LTE signal based on an LTE cell-specific reference signal (CRS) pattern associated with the LTE antenna port.
13. The UE of claim 9 , wherein the LTE network parameter is a frequency offset, and the programming further includes instructions to identify the subset of resources reserved for the LTE signal based on the frequency offset.
14. The UE of claim 13 , wherein the frequency offset is associated with an LTE cell specific reference signal (CRS).
15. The UE of claim 9 , wherein the LTE network parameter is an LTE Multicast-Broadcast Single-Frequency Network (MBSFN) configuration, and the programming further includes instructions to identify the subset of resources reserved for the LTE signal based on an LTE subframe configuration indicated by the LTE MBSFN configuration.
16. The UE of claim 9 , wherein the instructions to receive the NR downlink signal include instructions to:
receive one or more NR downlink signals over the one or more resources, the one or more NR downlink signals having zero power levels over the subset of resources reserved for the LTE signal, wherein the one or more NR downlink signals include an NR signal transmitted over a Physical Downlink Shared Channel (PDSCH).
17. A method comprising:
receiving, by a User Equipment (UE), a New Radio (NR) Radio Resource Control (RRC) signal indicating a frequency offset between a Long Term Evolution (LTE) subcarrier frequency alignment and an NR subcarrier frequency alignment; and
transmitting, by the UE, an NR uplink signal over one or more resources in a set of resources according to the LTE subcarrier frequency alignment, the set of resources comprising a subset of resources reserved for an LTE signal indicated by the NR control signal, the subset of resources reserved for the LTE signal corresponding to the LTE subcarrier frequency alignment, and the one or more resources excluding the subset of resources in the set of resources.
18. The method of claim 17 , wherein the one or more resources for the NR uplink signal and the subset of resources reserved for the LTE signal are frequency division multiplexed (FDM).
19. The method of claim 17 , further comprising adjusting the NR subcarrier frequency alignment of the NR uplink signal according to the indicated frequency offset.
20. A User Equipment (UE) comprising:
a processor; and
a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
receive a New Radio (NR) Radio Resource Control (RRC) signal indicating a frequency offset between a Long Term Evolution (LTE) subcarrier frequency alignment and an NR subcarrier frequency alignment; and
transmit an NR uplink signal over one or more resources in a set of resources according to the LTE subcarrier frequency alignment, the set of resources comprising a subset of resources reserved for an LTE signal indicated by the NR control signal, the subset of resources reserved for the LTE signal corresponding to the LTE subcarrier frequency alignment, and the one or more resources excluding the subset of resources in the set of resources.
21. The UE of claim 20 , wherein the one or more resources for the NR uplink signal and the subset of resources reserved for the LTE signal are frequency division multiplexed (FDM).
22. The UE of claim 20 , wherein the programming further includes instructions to adjust the NR subcarrier frequency alignment of the NR uplink signal according to the indicated frequency offset.