Synchronization signal transmission and detection
Aspects of the present disclosure provide designs for transmitting and detecting bursts of synchronization signal (SS) blocks. For example, a method for wireless communications by a base station (BS) may include determining a position of a first synchronization signal (SS) block, within a burst of SS blocks and transmitting the burst of SS blocks, in accordance with the determination.
1. A method for wireless communications by a user equipment (UE), comprising:
determining positions, in time, of multiple synchronization signal (SS) blocks, within a burst, based at least in part on a subcarrier spacing among a plurality of subcarrier spacings; and
processing one or more of the multiple SS blocks in the burst, in accordance with the determination, wherein:
symbol indexes indicate the positions of the multiple SS blocks within the burst;
an integer number of symbols between at least a first SS block within the burst and a second SS block within the burst depends on a carrier frequency on which the subcarrier spacing is deployed; and
a symbol index of at least the second SS block of the multiple SS blocks within the burst depends, at least in part, on the integer number of symbols that depends on the carrier frequency.
2. The method of claim 1 , wherein the positions of the multiple SS blocks within the burst of SS blocks depend on the carrier frequency.
3. The method of claim 1 , further comprising:
detecting an anchor synchronization signal (SS) block with a distinctive feature, wherein the distinctive feature comprises an order of SS signals that is different from other SS blocks within the burst of SS blocks;
determining a position of the first SS block, within the burst of SS blocks, based on the detection of the anchor SS block with the distinctive feature; and
wherein processing the burst of SS blocks comprises processing the burst of SS blocks, in accordance with the determination of the position of the first SS block.
4. The method of claim 3 , wherein the anchor SS block is the first SS block in the burst.
5. The method of claim 3 , wherein the position of the first SS block is determined based on at least one of a symbol index, slot numbers, subframe number, or radio frames number identified based on the anchor SS block.
6. The method of claim 3 , wherein the determination of the position of the first SS block is based on a pattern where one or more non-anchor SS blocks in the burst are not transmitted.
7. The method of claim 6 , wherein anchor SS blocks are transmitted each burst.
8. The method of claim 1 , wherein the burst comprises the multiple SS blocks in a half radio frame.
9. The method of claim 1 , wherein the positions of the multiple SS blocks in the burst are arranged in a symbol pattern associated with the subcarrier spacing.
10. The method of claim 1 , wherein a maximum number of SS blocks in the burst depends on the carrier frequency.
11. The method of claim 10 , wherein:
the maximum number of SS blocks is four if the carrier frequency is less than 3 GHz, the maximum number of SS blocks is eight if the carrier frequency is between 3 GHz and 6 GHz, and the maximum number of SS blocks is sixty four if the carrier frequency is between 6 GHz and 52.6 GHz.
12. The method of claim 1 ,
wherein a set of SS blocks, of the multiple SS blocks in the burst, are not transmitted in accordance with a pattern, wherein processing the one or more SS blocks in the burst is in accordance with the set of SS blocks that are not transmitted.
13. An apparatus for wireless communications by a user equipment (UE), comprising:
means for determining positions, in time, of multiple synchronization signal (SS) blocks, within a burst, based at least in part on a subcarrier spacing among a plurality of subcarrier spacings; and
means for processing one or more of the multiple SS blocks in the burst, in accordance with the determination, wherein:
symbol indexes indicate the positions of the multiple SS blocks within the burst;
an integer number of symbols between at least a first SS block within the burst and a second SS block within the burst depends on a carrier frequency on which the subcarrier spacing is deployed; and
a symbol index of at least the second SS block of the multiple SS blocks within the burst depends, at least in part, on the integer number of symbols that depends on the carrier frequency.
14. A non-transitory computer readable medium for wireless communications by a user equipment (UE) having instructions stored thereon for:
determining positions, in time, of multiple synchronization signal (SS) blocks, within a burst, based at least in part on a subcarrier spacing among a plurality of subcarrier spacings; and
processing one or more of the multiple SS blocks in the burst, in accordance with the determination, wherein:
symbol indexes indicate the positions of the multiple SS blocks within the burst;
an integer number of symbols between at least a first SS block within the burst and a second SS block within the burst depends on a carrier frequency on which the subcarrier spacing is deployed; and
a symbol index of at least the second SS block of the multiple SS blocks within the burst depends, at least in part, on the integer number of symbols that depends on the carrier frequency.
15. An apparatus for wireless communications by a user equipment (UE), comprising:
at least one processor configured to:
determine positions, in time, of multiple synchronization signal (SS) blocks, within a burst, based at least in part on a subcarrier spacing among a plurality of subcarrier spacings; and
process one or more of the multiple SS blocks in the burst, in accordance with the determination, wherein:
symbol indexes indicate the positions of the multiple SS blocks within the burst;
an integer number of symbols between at least a first SS block within the burst and a second SS block within the burst depends on a carrier frequency on which the subcarrier spacing is deployed; and
a symbol index of at least the second SS block of the multiple SS blocks within the burst depends, at least in part, on the integer number of symbols that depends on the carrier frequency; and
a memory coupled to the at least one processor.
16. The apparatus of claim 15 , wherein the positions of the multiple SS blocks within the burst of SS blocks depend on the carrier frequency.
17. The apparatus of claim 15 , wherein the at least one processor is further configured to:
detect an anchor synchronization signal (SS) block with a distinctive feature, wherein the distinctive feature comprises an order of SS signals that is different from other SS blocks within the burst of SS blocks;
determine a position of the first SS block, within the burst of SS blocks, based on the detection of the anchor SS block with the distinctive feature; and
process the burst of SS blocks, in accordance with the determination of the position of the first SS block.
18. The apparatus of claim 17 , wherein the anchor SS block is the first SS block in the burst.
19. The apparatus of claim 17 , wherein the position is determined based on at least one of a symbol index, slot numbers, subframe number, or radio frames number identified based on the anchor SS block.
20. The apparatus of claim 17 , wherein the determination of the position of the first SS block is based on a pattern where one or more non-anchor SS blocks in the burst are not transmitted.
21. The apparatus of claim 20 , wherein anchor SS blocks are transmitted each burst.
22. The apparatus of claim 15 ,
wherein a set of SS blocks, of the multiple SS blocks in the burst, are not transmitted in accordance with a pattern, wherein processing the one or more SS blocks in the burst is in accordance with the set of SS blocks that are not transmitted.