Framework for communications in unlicensed narrow band internet of things (NB-IOT) system
The present disclosure provides apparatuses, systems, methods, and machine readable storage medium for communications in a Narrow Band Internet of Things (NB-IoT) system in a sub-1 GHz band. In an embodiment, an apparatus for a user equipment (UE) includes a memory interface and a processor. The memory interface is operable to receive a configuration of a frame from a memory, the frame is to be used for communications in a Narrow Band Internet of Things (NB-IoT) system in a sub-1 GHz band, wherein the frame includes one or more anchor channels and one or more data channels. The processor is operable to encode uplink (UL) communication data for a base station or decode downlink (DL) communication data from the base station based on the configuration of the frame.
1. An apparatus, comprising
a processor configured to cause a user equipment (UE) to:
receive a configuration of a frame from a memory, wherein the frame is to be used for communications in a Narrow Band Internet of Things (NB-IoT) system in an unlicensed sub-1 GHz band, wherein the frame includes an anchor channel and a plurality of data channels, wherein synchronization channels and a physical broadcast channel (PBCH) are received on the anchor channel, wherein traffic data is received according to a hopping pattern on the plurality of data channels, and wherein random channel hopping patterns for different channels are selected to avoid a frequency point collision between different channels at a specific time instance;
encode uplink (UL) communication data for a base station or decode downlink (DL) communication data from the base station based on the configuration of the frame; and
when the UE is in an idle mode, initiate an initial access procedure or a resynchronize procedure on the anchor channel of the frame to synchronize or resynchronize with the base station, wherein the anchor channel for the initial access procedure or the resynchronization procedure is defined as N data ×T dwell , wherein T dwell is a time duration of the anchor channel, and N data is a number of data dwells of time duration T dwell .
2. The apparatus of claim 1 , wherein the anchor channel is a fixed channel or a hard-coded physical channel.
3. The apparatus of claim 1 , wherein the anchor channel is used for broadcasting DL transmissions, including at least one or more of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH).
4. The apparatus of claim 1 , wherein each of the anchor channel and data channels is predefined as either hopped or fixed, and when a channel is predefined as hopped, the hopping pattern is generated based on one or more of: a cell identity (ID), a frame/subframe index, a high layer configured index, and a UE index.
5. The apparatus of claim 1 , wherein different channels have the same or different UL/DL configurations.
6. The apparatus of claim 1 , wherein when the frequency point collision occurs between two data channels, the processor is operable to:
decode a decision received from the base station, wherein the decision is made by the base station based on an implementation of the base station for scheduling on the collided frequency point, and the decision is to schedule different UEs on one channel or different channels.
7. The apparatus of claim 1 , wherein the processor is operable to:
decode a Discovery Reference Signal (DRS) received from the base station on the anchor channel, wherein the DRS includes one or more of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), and a System Information Block (SIB).
8. The apparatus of claim 1 , wherein a frequency of the anchor channel is fixed, and wherein the frequency of the anchor channel corresponds to a logic channel index.
9. The apparatus of claim 1 , wherein the hopping pattern is a pseudo random pattern.
10. The apparatus of claim 1 , wherein each of the anchor channel and data channels is able to be used for transmission of one or more of: a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), an essential System Information Block (SIB), and broadcast or unicast downlink or uplink subframes.
11. An apparatus, comprising:
a processor configured to cause a base station to: receive a configuration of a frame from a memory, wherein the frame is to be used for communications in a Narrow Band Internet of Things (NB-IoT) system in an unlicensed sub-1 GHz band, wherein the frame includes an anchor channel and a plurality of data channels, wherein synchronization channels and a physical broadcast channel (PBCH) are transmitted on the anchor channel and traffic data is transmitted according to a hopping pattern on the plurality of data channels, and wherein random channel hopping patterns for different channels are selected to avoid a frequency point collision between different channels at a specific time instance;
decode uplink (UL) communication data from a user equipment (UE) or encode downlink (DL) communication data for the UE based on the configuration of the frame; and
when the UE is in an idle mode, perform an initial access procedure or a resynchronize procedure on the anchor channel of the frame to synchronize or resynchronize with the UE, wherein the anchor channel for the initial access procedure or the resynchronization procedure is defined as N data ×T dwell , wherein T dwell is a time duration of the anchor channel, and N data is a number of data dwells of time duration T dwell .
12. The apparatus of claim 11 , wherein the anchor channel is a fixed channel or a hard coded physical channel.
13. The apparatus of claim 11 , wherein the anchor channel is used for broadcasting DL transmission, including at least one or more of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH).
14. The apparatus of claim 11 , wherein each of the anchor channel and data channels is predefined as either hopped or fixed, and when a channel is predefined as hopped, the hopping pattern is generated based on one or more of: a cell identity (ID), a frame/subframe index, a high layer configured index, and a UE index.
15. The apparatus of claim 11 , wherein different channels have the same or different UL/DL configurations.
16. The apparatus of claim 11 , wherein when the frequency point collision occurs between two data channels, the processor is operable to:
make a decision based on an implementation of the base station for scheduling on the collided frequency point, and the decision is to schedule different UEs on one channel or different channels.
17. The apparatus of claim 11 , wherein the processor is operable to:
encode a Discovery Reference Signal (DRS) to be transmitted on the anchor channel, wherein the DRS includes one or more of: a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), and a System Information Block (SIB).
18. The apparatus of claim 11 , wherein a number of the anchors is predefined.
19. The apparatus of claim 11 , wherein each of the anchor channel and data channels is able to be used for transmission of one of more of: a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), an essential System Information Block (SIB), and broadcast or unicast downlink or uplink subframes.
20. One or more non-transitory computer-readable media having instructions stored thereon, the instructions when executed by one or more processors of a user equipment (UE), cause the UE to:
initiate an initial access procedure or a resynchronization procedure on an anchor channel of a frame for communications in a Narrow Band Internet of Things (NB-IoT) system in an unlicensed sub-1 GHz band, to synchronize or resynchronize with a base station, when the UE is in an idle mode, wherein the frame includes an anchor channel and a plurality of data channels, wherein synchronization channels and a physical broadcast channel (PBCH) are received on the anchor channel and traffic data is received according to a hopping pattern on the plurality of data channels, wherein random channel hopping patterns for different channels are selected to avoid a frequency point collision between different channels at a specific time instance, and wherein the anchor channel for the initial access procedure or the resynchronization procedure is defined as N data ×T dwell , wherein T dwell is a time duration of the anchor channel, and N data is a number of data dwells of time duration T dwell ; and
decode downlink (DL) transmission received from the base station on the anchor channel, wherein the DL transmission includes at least one of more of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS) and a Physical Broadcast Channel (PBCH).