Channel dependent coverage enhancement techniques in LTE
Methods, systems, and devices are described for coverage enhancement in a wireless communication system. A base station may select different coverage enhancement techniques for different channels, and transmit the channels using the selected coverage enhancement techniques. Examples of coverage enhancement techniques that may be selected include repetition within subframes, repetition across different subframes, power boosting, and spatial multiplexing. These and other techniques may be used alone or in combination. In some examples, a user equipment (UE) may determine a coverage enhancement need and may monitor a control channel accordingly.
1. A method for wireless communication, comprising:
receiving a first portion of data on a first channel, the first portion of data sent using a first coverage enhancement technique of repetition over different subframes, repetition within a subframe, or power boosting;
receiving a second portion of data on a second channel using a second coverage enhancement technique different from the first coverage enhancement technique, wherein the second channel is different from the first channel;
decoding the first portion of data based at least in part on the first coverage enhancement technique; and
decoding the second portion of data based at least in part on the second coverage enhancement technique.
2. The method of claim 1 , wherein the first channel comprises a broadcast or a groupcast channel and the first coverage enhancement technique comprises repetition over different subframes.
3. The method of claim 1 , wherein the second channel comprises a unicast channel and the second coverage enhancement technique comprises precoding for spatial multiplexing.
4. The method of claim 3 , wherein the second channel comprises a physical downlink shared channel (PDSCH).
5. The method of claim 1 , wherein the first coverage enhancement technique or the second coverage enhancement technique comprises repetition within a subframe.
6. The method of claim 5 , wherein the first channel comprises at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH) and the second coverage enhancement technique comprises the repetition within the subframe.
7. The method of claim 1 , further comprising:
receiving a third portion of data on the second channel using a third coverage enhancement technique.
8. The method of claim 7 , wherein:
the first coverage enhancement technique comprises a first number of repetitions over a first plurality of subframes;
the third coverage enhancement technique comprises a second number of repetitions over a second plurality of subframes; and
the second number of repetitions is less than the first number of repetitions.
9. An apparatus for wireless communication, comprising:
means for receiving a first portion of data on a first channel, the first portion of data sent using a first coverage enhancement technique of repetition over different subframes, repetition within a subframe, or power boosting;
means for receiving a second portion of data on a second channel using a second coverage enhancement technique different from the first coverage enhancement technique, wherein the second channel is different from the first channel;
means for decoding the first portion of data based at least in part on the first coverage enhancement technique; and
means for decoding the second portion of data based at least in part on the second coverage enhancement technique.
10. The apparatus of claim 9 , wherein the first channel comprises a broadcast or a groupcast channel and the first coverage enhancement technique comprises repetition over different subframes.
11. The apparatus of claim 9 , wherein the second channel comprises a unicast channel and the second coverage enhancement technique comprises precoding for spatial multiplexing.
12. The apparatus of claim 9 , wherein the first coverage enhancement techniques comprises repetition within a subframe.
13. The apparatus of claim 9 , further comprising:
means for receiving a third portion of data on the second channel using a third coverage enhancement technique.
14. The apparatus of claim 13 , wherein:
the first coverage enhancement technique comprises a first number of repetitions over a first plurality of subframes;
the third coverage enhancement technique comprises a second number of repetitions over a second plurality of subframes; and
the second number of repetitions is less than the first number of repetitions.
15. 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 a first portion of data on a first channel, the first portion of data sent using a first coverage enhancement technique of repetition over different subframes, repetition within a subframe, or power boosting;
receive a second portion of data on a second channel using a second coverage enhancement technique different from the first coverage enhancement technique, wherein the second channel is different from the first channel;
decode the first portion of data based at least in part on the first coverage enhancement technique; and
decode the second portion of data based at least in part on the second coverage enhancement technique.
16. The apparatus of claim 15 , wherein the first channel comprises a broadcast or a groupcast channel and the first coverage enhancement technique comprises repetition over different subframes.
17. The apparatus of claim 15 , wherein the second channel comprises a unicast channel and the second coverage enhancement technique comprises precoding for spatial multiplexing.
18. The apparatus of claim 15 , wherein the first coverage enhancement techniques comprises repetition within a subframe.
19. The apparatus of claim 15 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive a third portion of data on the second channel using a third coverage enhancement technique.
20. The apparatus of claim 19 , wherein:
the first coverage enhancement technique comprises a first number of repetitions over a first plurality of subframes;
the third coverage enhancement technique comprises a second number of repetitions over a second plurality of subframes; and
the second number of repetitions is less than the first number of repetitions.
21. A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable to:
receive a first portion of data on a first channel, the first portion of data sent using a first coverage enhancement technique of repetition over different subframes, repetition within a subframe, or power boosting;
receive a second portion of data on a second channel using a second coverage enhancement technique different from the first coverage enhancement technique, wherein the second channel is different from the first channel;
decode the first portion of data based at least in part on the first coverage enhancement technique; and
decode the second portion of data based at least in part on the second coverage enhancement technique.
22. The non-transitory computer-readable medium of claim 21 , wherein the first channel comprises a broadcast or a groupcast channel and the first coverage enhancement technique comprises repetition over different subframes.
23. The non-transitory computer-readable medium of claim 21 , wherein the second channel comprises a unicast channel and the second coverage enhancement technique comprises precoding for spatial multiplexing.
24. The non-transitory computer-readable medium of claim 21 , wherein the first coverage enhancement techniques comprises repetition within a subframe.
25. The non-transitory computer-readable medium of claim 21 , wherein the instructions are further executable to:
receive a third portion of data on the second channel using a third coverage enhancement technique.
26. The non-transitory computer-readable medium of claim 25 , wherein:
the first coverage enhancement technique comprises a first number of repetitions over a first plurality of subframes;
the third coverage enhancement technique comprises a second number of repetitions over a second plurality of subframes; and
the second number of repetitions is less than the first number of repetitions.