Evolved Node-B and user equipment and methods for operation in a coverage enhancement mode
Embodiments of an eNB to operate in accordance with a coverage enhancement mode are disclosed herein. The eNB may comprise hardware processing circuitry to, during a legacy sub-frame, transmit a system information block (SIB) in legacy SIB frequency resources according to a legacy SIB transmission format and refrain from transmission of channel state information reference signals (CSI-RS). The hardware processing circuitry may be further to, during a first coverage enhancement sub-frame, transmit a first portion of the SIB in first SIB frequency resources included in the legacy SIB frequency resources. The hardware processing circuitry may be further to, during a first coverage enhancement sub-frame, transmit a first set of CSI-RS in first CSI-RS frequency resources that include at least a portion of the legacy SIB frequency resources.
1. An apparatus of an Evolved Node-B (eNB), the apparatus comprising: processing circuitry; and memory, the processing circuitry configured to:
encode an information block for transmission to a user equipment (UE) to indicate a mapping of resource elements for a physical downlink shared channel (PDSCH);
map the PDSCH to all the resource elements indicated in the mapping for transmission of the PDSCH; and
configure the eNB for transmission of the PDSCH in the resource elements based on the mapping,
wherein if the UE is configured for enhanced coverage, the processing circuitry is configured to exclude the resource elements indicated by the mapping that are occupied by a channel state information reference signal (CSI-RS) when transmitting the PDSCH, and
wherein the memory is configured to store the information block.
2. The apparatus of claim 1 , wherein one or more CSI-RSs occupies one or more or the resource elements indicated in the mapping for the PDSCH.
3. The apparatus of claim 1 wherein the information block is a system information block (SIB).
4. The apparatus of claim 1 wherein the information block is a master information block (MIB).
5. The apparatus of claim 1 wherein the processing circuitry is configured to encode the PDSCH for transmission based on all the resource elements indicated by the mapping and refrain from transmitting the PDSCH in the resource elements occupied by a CSI-RS.
6. The apparatus of claim 1 wherein the processing circuitry is configured to count the resource elements occupied by the CS-RSs in the PDSCH mapping but not use the resource elements occupied by the CS-RSs for transmission of the PDSCH.
7. The apparatus of claim 1 wherein the processing circuitry is configured to:
determine the mapped resource elements to repeat periodically in sets of frames; and
if the UE is configured for enhanced coverage:
encode the information block for transmission during an enhanced coverage sub-frame;
refrain from transmission of the CSI-RS within resource elements of the enhanced coverage sub-frame; and
refrain from transmission of a CSI-RS in a subframe where transmission of the CSI-RS would collide with the information block.
8. The apparatus of claim 7 , wherein the processing circuitry is further configured to configure the eNB to:
transmit, during the enhanced coverage sub-frame, a first portion of the SIB within the plurality of mapped resource elements of the PDSCH; and
transmit, during the enhanced coverage sub-frame, a first set of CSI-RS within a portion of the plurality of mapped resource elements of the PDSCH.
9. The apparatus of claim 8 , wherein the processing circuitry is further configured to configure the eNB to:
transmit, during the enhanced coverage sub-frame, a second portion of the SIB to the UE within a second plurality of mapped resource elements of the PDSCH; and
transmit, during the enhanced coverage sub-frame, a second set of CSI-RS in within a portion of the second plurality of mapped resource elements of the PDSCH, wherein the portion of the plurality of mapped resource elements for transmission of the first set of CSI-RS is excluded from the portion of the second plurality of mapped resource elements.
10. The apparatus of claim 1 wherein the processing circuitry comprises a baseband processor.
11. A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of an Evolved Node-B (eNB), the instructions to configure the processing circuitry to:
encode an information block for transmission to a user equipment (UE) to indicate a mapping of resource elements for a physical downlink shared channel (PDSCH);
map the PDSCH to all the resource elements indicated in the mapping for transmission of the PDSCH;
configure the eNB for transmission of the PDSCH in the resource elements based on the mapping; and
store the information block in memory,
wherein if the UE is configured for enhanced coverage, the processing circuitry is configured to exclude the resource elements indicated by the mapping that are occupied by a channel state information reference signal (CSI-RS) when transmitting the PDSCH.
12. The non-transitory computer-readable storage medium of claim 11 , wherein one or more CSI-RSs occupies one or more or the resource elements indicated in the mapping for the PDSCH.
13. The non-transitory computer-readable storage medium of claim 11 wherein the information block is a system information block (SIB).
14. The non-transitory computer-readable storage medium of claim 11 wherein the information block is a master information block (MIB).
15. The non-transitory computer-readable storage medium of claim 11 wherein the processing circuitry is configured to encode the PDSCH for transmission based on all the resource elements indicated by the mapping and refrain from transmitting the PDSCH in the resource elements occupied by a CSI-RS.
16. The non-transitory computer-readable storage medium of claim 11 wherein the processing circuitry is configured to count the resource elements occupied by the CS-RSs in the PDSCH mapping but not use the resource elements occupied by the CS-RSs for transmission of the PDSCH.
17. The non-transitory computer-readable storage medium of claim 11 wherein the processing circuitry is configured to:
determine the mapped resource elements to repeat periodically in sets of frames; and
if the UE is configured for enhanced coverage:
encode the information block for transmission during an enhanced coverage sub-frame;
refrain from transmission of the CSI-RS within resource elements of the enhanced coverage sub-frame; and
refrain from transmission of a CSI-RS in a subframe where transmission of the CSI-RS would collide with the information block.
18. The non-transitory computer-readable storage medium of claim 17 , wherein the processing circuitry is further configured to configure the eNB to:
transmit, during the enhanced coverage sub-frame, a first portion of the SIB within the plurality of mapped resource elements of the PDSCH; and
transmit, during the enhanced coverage sub-frame, a first set of CSI-RS within a portion of the plurality of mapped resource elements of the PDSCH.
19. The non-transitory computer-readable storage medium of claim 18 , wherein the processing circuitry is further configured to configure the eNB to:
transmit, during the enhanced coverage sub-frame, a second portion of the SIB to the UE within a second plurality of mapped resource elements of the PDSCH; and
transmit, during the enhanced coverage sub-frame, a second set of CSI-RS in within a portion of the second plurality of mapped resource elements of the PDSCH, wherein the portion of the plurality of mapped resource elements for transmission of the first set of CSI-RS is excluded from the portion of the second plurality of mapped resource elements.
20. An apparatus of User Equipment (UE) configured for enhanced coverage, the apparatus comprising: processing circuitry; and memory, the processing circuitry configured to:
decode an information block received from an Evolved Node-B (eNB), the information block to indicate a mapping of resource elements for a physical downlink shared channel (PDSCH);
decode one or more channel state information reference signals (CSI-RSs) received on some of the resource elements indicated in the mapping for transmission of the PDSCH;
decode the PDSCH received on the resource elements indicated in the mapping for transmission of the PDSCH that were not occupied by a CSI-RS; and
store the information block in the memory.