Methods and apparatus for partial subframe transmission and broadcast channel on unlicensed spectrum in a licensed assisted access (LAA) cell
An apparatus for user equipment (UE). The UE comprises a transceiver configured to receive an indication of a partial subframe configuration over an unlicensed spectrum in a licensed assisted access (LAA) cell. The UE further includes at least one processor configured to determine a resource element (RE) mapping rule based on the indication of the partial subframe configuration; and identify an RE position of at least one reference signal to be received from the eNB based on the RE mapping rule.
1. A user equipment (UE), the UE comprising:
a transceiver configured to receive, from an eNodeB (eNB), an indication of a partial subframe configuration over an unlicensed spectrum in a licensed assisted access (LAA) cell; and
at least one processor configured to:
determine a resource element (RE) mapping rule based on the indication of the partial subframe configuration;
identify an RE position of at least one reference signal to be received from the eNB based on the RE mapping rule;
apply the RE mapping rule when the indication of the partial subframe configuration is received from the eNB; and
apply a different RE mapping rule when the indication of the partial subframe configuration is not received from the eNB.
2. The UE of claim 1 , wherein the at least one processor is further configured to identify a valid starting position of at least one orthogonal frequency division multiplexing (OFDM) symbol of a downlink transmission burst based on the indication of the partial subframe configuration.
3. The UE of claim 2 , wherein the downlink transmission burst including the valid starting position of the at least one OFDM symbol that is configured by the indication of the partial subframe configuration comprises at least one of a physical downlink shared channel (PDSCH), an enhanced physical downlink control channel (EPDCCH), and a physical downlink control channel (PDCCH).
4. The UE of claim 1 , wherein the at least one processor is further configured to determine a set of valid starting and ending positions of at least one OFDM symbol of a downlink transmission burst based on the indication of the partial subframe configuration.
5. The UE of claim 1 , wherein the at least one processor is further configured to determine the RE position of the at least one reference signal based on a valid starting position of at least one OFDM symbol of a downlink transmission burst.
6. The UE of claim 1 , when the indication of the partial subframe configuration is received from the eNB, the RE mapping rule comprises identifying the RE position of at least one reference signal based on a non-multicast broadcast single frequency network (non-MBSFN) subframe pattern for the partial subframe configuration regardless of whether MBSFN subframe is configured for the partial subframe configuration.
7. The UE of claim 1 , wherein:
the at least one reference signal comprises a common reference signal (CRS) that is configured by the indication of the partial subframe configuration, and
the configured CRS is mapped in a non-MBSFN subframe.
8. An eNodeB (eNB), the eNB comprising:
a transceiver configured to transmit, to a user equipment (UE), an indication of a partial subframe configuration over an unlicensed spectrum in a licensed assisted access (LAA) cell; and
at least one processor configured to:
when a resource element (RE) mapping rule is used based on the indication of the partial subframe configuration, configure an RE position of at least one reference signal to be transmitted to the UE based on the RE mapping rule;
apply the RE mapping rule when the indication of the partial subframe configuration is transmitted to the UE; and
apply a different RE mapping rule when the indication of the partial subframe configuration is not transmitted to the UE.
9. The eNB of claim 8 , wherein the at least one processor is further configured to identify a valid starting position of at least one orthogonal frequency division multiplexing (OFDM) symbol of a downlink transmission burst based on the indication of the partial subframe configuration.
10. The eNB of claim 9 , wherein the downlink transmission burst including the valid starting position of the at least one OFDM symbol that is configured by the indication of the partial subframe configuration comprises at least one of a physical downlink shared channel (PDSCH), an enhanced physical downlink control channel (EPDCCH), and a physical downlink control channel (PDCCH).
11. The eNB of claim 8 , wherein the at least one processor is further configured to determine a set of valid starting and ending positions of at least one OFDM symbol of a downlink transmission burst based on the indication of the partial subframe configuration.
12. The eNB of claim 8 , wherein the at least one processor is further configured to determine the RE position of the at least one reference signal based on a valid starting position of at least one OFDM symbol of a downlink transmission burst.
13. The eNB of claim 8 , when the indication of the partial subframe configuration is transmitted to the UE, the RE mapping rule comprises at least one RE positions indicated based on a non-multicast broadcast single frequency network (non-MBSFN) subframe pattern for the partial subframe configuration regardless of whether MBSFN subframe is configured for the partial subframe configuration.
14. The eNB of claim 8 , wherein:
the at least one reference signal comprises a common reference signal (CRS) that is configured by the indication of the partial subframe configuration, and
the configured CRS is mapped in a non-MBSFN subframe.