Narrowband time-division duplex frame structure for narrowband communications
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may determine a narrowband TDD frame structure of a group of narrowband TDD frame structures for narrowband communications. The apparatus may transmit a series of repetitions of a narrowband physical downlink channel using the narrowband TDD frame structure. In one aspect, a first portion of repetitions from the series of repetitions may be transmitted in one or more first sets of downlink subframes using a first scrambling sequence. In one aspect, a second portion of repetitions from the series of repetitions may be transmitted in one or more second sets of downlink subframes using a second scrambling sequence.
1. A method of wireless communications for a user equipment, comprising:
determining a time-division duplex (TDD) frame structure of a group of TDD frame structures being used by a radio access network for narrowband communications;
receiving, from a base station, a series of repetitions of a narrowband physical downlink channel using the narrowband TDD frame structure, wherein a first portion of repetitions from the series of repetitions comprises a first subframe group and a second portion of repetitions from the series of repetitions comprises a second subframe group;
wherein the first subframe group comprises a first set of downlink subframes scrambled using a first scrambling sequence, the first set of downlink subframes including a first downlink subframe and a predetermined first number of following subframes; and
wherein the second subframe group comprises a second set of downlink subframes scrambled using a second scrambling sequence, the second set of downlink subframes including a second downlink subframe and a predetermined second number of following subframes, and the first subframe group and the second subframe group do not overlap.
2. The method of claim 1 , wherein the first set of downlink subframes includes a same number of subframes as the second set of downlink subframes.
3. The method of claim 1 , wherein the series of repetitions comprises a plurality of subframe groups, each of the plurality of subframe groups being associated with a particular scrambling sequence, and each subframe group being determined based on a downlink subframe and a predetermined number of following subframes, and wherein none of the subframe groups have overlapping subframes.
4. The method of claim 3 , wherein each of the plurality of subframe groups comprises four or less subframes.
5. The method of claim 3 , wherein the first set of downlink subframes includes a different number of subframes than the second set of downlink subframes.
6. The method of claim 1 , wherein the first subframe group and the second subframe group each comprise four or less subframes.
7. An apparatus for wireless communications for a user equipment, comprising:
means for determining a time-division duplex (TDD) frame structure of a group of TDD frame structures being used by a radio access network for narrowband communications;
means for receiving, from a base station, a series of repetitions of a narrowband physical downlink channel using the narrowband TDD frame structure, wherein a first portion of repetitions from the series of repetitions comprises a first subframe group and a second portion of repetitions from the series of repetitions comprises a second subframe group;
wherein the first subframe group comprises a first set of downlink subframes scrambled using a first scrambling sequence, the first set of downlink subframes including a first downlink subframe and a predetermined first number of following subframes; and
wherein the second subframe group comprises a second set of downlink subframes scrambled using a second scrambling sequence, the second set of downlink subframes including a second downlink subframe and a predetermined second number of following subframes, and the first subframe group and the second subframe group do not overlap.
8. The apparatus of claim 7 , wherein the first set of downlink subframes includes a same number of subframes as the second set of downlink subframes.
9. The apparatus of claim 7 , wherein the series of repetitions comprises a plurality of subframe groups, each of the plurality of subframe groups being associated with a particular scrambling sequence, and each subframe group being determined based on a downlink subframe and a predetermined number of following subframes, and wherein none of the subframe groups have overlapping subframes.
10. The apparatus of claim 9 , wherein each of the plurality of subframe groups comprise four or less subframes.
11. The apparatus of claim 9 , wherein the first set of downlink subframes includes a different number of subframes than the second set of downlink subframes.
12. The apparatus of claim 7 , wherein the first subframe group and the second subframe group each comprise four or less subframes.
13. An apparatus for wireless communications for a user equipment, comprising: a memory; and
at least one processor coupled to the memory and configured to:
determine a time-division duplex (TDD) frame structure of a group of TDD frame structures being used by a radio access network for narrowband communications;
receive, from a base station, a series of repetitions of a narrowband physical downlink channel using the narrowband TDD frame structure, wherein a first portion of repetitions from the series of repetitions comprises a first subframe group and a second portion of repetitions from the series of repetitions comprises a second subframe group;
wherein the first subframe, group comprises a first set of downlink subframes scrambled using a first scrambling sequence, the first set of downlink subframes including a first downlink subframe and a predetermined first number of following subframes; and
wherein the second subframe group comprises a second set of downlink subframes scrambled using a second scrambling sequence, the second set of downlink subframes including a second downlink subframe and a predetermined second number of following subframes, and the first subframe group and the second subframe group do not overlap.
14. The apparatus of claim 13 , wherein the first set of downlink subframes includes a same number of subframes as the second set of downlink subframes.
15. The apparatus of claim 13 , wherein the series of repetitions comprises a plurality of subframe groups, each of the plurality of subframe groups being associated with a particular scrambling sequence, and each subframe group being determined based on a downlink subframe and a predetermined number of following subframes, and wherein none of the subframe groups have overlapping subframes.
16. The apparatus of claim 15 , wherein each of the plurality of subframe groups comprise four or less subframes.
17. The apparatus of claim 15 , wherein the first set of downlink subframes includes a different number of subframes than the second set of downlink subframes.
18. The apparatus of claim 13 , wherein the first subframe group and the second subframe group each comprise four or less subframes.
19. A non-transitory computer-readable medium storing computer executable code for a user equipment, the code when executed by a processor cause the processor to:
determine a time-division duplex (TDD) frame structure of a group of TDD frame structures being used by a radio access network for narrowband communications;
receive, from a base station, a series of repetitions of a narrowband physical downlink channel using the narrowband TDD frame structure, wherein a first portion of repetitions from the series of repetitions comprises a first subframe group and a second portion of repetitions from the series of repetitions comprises a second subframe group;
wherein the first subframe group comprises a first set of downlink subframes scrambled using a first scrambling sequence, the first set of downlink subframes including a first downlink subframe and a predetermined first number of following, subframes; and
wherein the second subframe group comprises a second set of downlink subframes scrambled using a second scrambling sequence, the second set of downlink subframes including a second downlink subframe and a predetermined second number of following subframes, and the first subframe group and the second subframe group do not overlap.
20. The non-transitory computer-readable medium of claim 19 , wherein the first set of downlink subframes includes a same number of subframes as the second set of downlink subframes.
21. The non-transitory computer-readable medium of claim 19 , wherein the series of repetitions comprises a plurality of subframe groups, each of the plurality of subframe groups being associated with a particular scrambling sequence, and each subframe group being determined based on a downlink subframe and a predetermined number of following subframes, and wherein none of the subframe groups have overlapping subframes.
22. The non-transitory computer-readable medium of claim 21 , wherein each of the plurality of subframe groups comprise four or less subframes.
23. The non-transitory computer-readable medium of claim 21 , wherein the first set of downlink subframes includes a different number of subframes than the second set of downlink subframes.
24. The non-transitory computer-readable medium of claim 19 , wherein the first subframe group and the second subframe group each comprise four or less subframes.