Enhanced discontinuous reception design for a shared frequency band
Methods, systems, and devices for wireless communication are described. A base station may transmit a configuration for enhanced paging to a UE being served by a cell over a shared frequency band. The enhanced paging may include multiple paging intervals for each paging cycle. The UE may enable reception for a paging interval and determine whether the UE receives a downlink transmission. The UE may lengthen a paging interval or enable reception during a second paging interval based in part on determining whether the UE receives a downlink transmission. In some examples, the UE may receive a paging queue status indication indicating that paging information will be transmitted during a paging interval or a later interval, or indicating that no paging information is present at a serving cell.
1. A method of wireless communication comprising:
receiving, at a user equipment (UE) served via a cell of a shared frequency band, a configuration for discontinuous reception (DRX) operation on the cell, the configuration including a set of paging opportunities comprising at least a first paging interval;
enabling reception for the first paging interval of the set of paging opportunities;
detecting whether a downlink transmission from a base station is present on the cell during the first paging interval, wherein the downlink transmission is subject to a listen before talk channel access procedure of the shared frequency band; and
determining whether to enable reception for a second paging interval of the set of paging opportunities based at least in part on a result of the detecting.
2. The method of claim 1 , wherein the detecting comprises detecting that no downlink transmission is present on the cell during the first paging interval, the method further comprising:
disabling reception at an end of the first paging interval based on the detecting; and
enabling reception for the second paging interval based on the detecting.
3. The method of claim 1 , wherein the detecting comprises detecting that the downlink transmission is present on the cell during the first paging interval, the method further comprising:
detecting whether a paging indication is present in the downlink transmission during the first paging interval; and
disabling reception at an end of the first paging interval based at least in part on detecting that no paging indication for the UE is present in the downlink transmission during the first paging interval.
4. The method of claim 3 , wherein
the first paging interval and the second paging interval overlap.
5. The method of claim 3 , wherein
the paging indication comprises a control channel masked with a paging radio network temporary identity (P-RNTI).
6. The method of claim 3 , wherein
the disabling is based at least in part on detecting that the paging indication is present in a first portion of the first paging interval and then detecting that the paging indication is absent in a second portion of the first paging interval.
7. The method of claim 1 , wherein enabling reception for the second paging interval is based at least in part on:
detecting that no downlink transmission on the cell is present during the first paging interval;
or detecting that the downlink transmission is present during the first paging interval and detecting that a paging indication is present during a portion of the first paging interval.
8. The method of claim 7 , further comprising:
disabling reception at an end of the second paging interval based at least in part on detecting that an additional downlink transmission is present during the second paging interval and detecting that no paging indication is present during the second paging interval.
9. The method of claim 1 , wherein
the downlink transmission comprises a reference signal, a cell-specific reference signal (CRS), a discovery reference signal (DRS), or any combination thereof.
10. The method of claim 1 , wherein
the second paging interval is discontinuous in time from the first paging interval.
11. The method of claim 1 , further comprising:
disabling reception for a remainder of the set of paging opportunities based at least in part on detecting that the downlink transmission comprises a paging queue empty indication, wherein the paging queue empty indication indicates that paging information for the UE will not be transmitted during the set of paging opportunities.
12. The method of claim 11 , wherein
the disabling reception occurs before an end of the first paging interval.
13. The method of claim 11 , wherein
the configuration for DRX operation comprises the second paging interval, and wherein the disabling reception comprises disabling reception for the second paging interval of the set of paging opportunities.
14. The method of claim 11 , wherein
the paging queue empty indication is indicated in a physical channel of the downlink transmission, in a physical frame format indication channel (PFFICH), in a physical micro sleep indicator channel (PMSICH), in a physical broadcast channel (PBCH), in a radio resource control (RRC) message, or in a message masked with a radio network temporary identity (RNTI).
15. The method of claim 11 , wherein
the paging queue empty indication indicates that no paging information for at least a subset of UEs served by the cell will be transmitted in the set of paging opportunities.
16. An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive, at a user equipment (UE) served via a cell of a shared frequency band, a configuration for discontinuous reception (DRX) operation on the cell, the configuration including a set of paging opportunities comprising at least a first paging interval;
enable reception for the first paging interval of the set of paging opportunities;
detect whether a downlink transmission from a base station is present on the cell during the first paging interval, wherein the downlink transmission is subject to a listen before talk channel access procedure of the shared frequency band; and
determine whether to enable reception for a second paging interval of the set of paging opportunities based at least in part on a result of the detecting.
17. The apparatus of claim 16 , wherein:
the detecting comprises: detecting that no downlink transmission is present on the cell during the first paging interval, the method further comprising:
the instructions are further executable to disable reception at an end of the first paging interval based on the detecting; and
enable reception for the second paging interval based on the detecting.
18. The apparatus of claim 16 , wherein:
the detecting comprises: detecting that the downlink transmission is present on the cell during the first paging interval, the method further comprising:
the instructions are further executable to detect whether a paging indication is present in the downlink transmission during the first paging interval; and
disable reception at an end of the first paging interval based at least in part on detecting that no paging indication for the UE is present in the downlink transmission during the first paging interval.