Physical (PHY) layer solutions to support use of mixed numerologies in the same channel
A wireless transmit/receive unit (WTRU) may receive a first signal including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The PSS and SSS may be received in a resource block of a cell and the resource block may have a first numerology. Further, the first numerology may have a first subcarrier spacing, while other resources of the cell at a same time as the resource block may have a second numerology with a different subcarrier spacing than the first numerology. In addition, the WTRU may determine synchronization based on the PSS and SSS. Also, the WTRU may receive a second signal in the cell, and the second signal may have the second numerology. Moreover, the WTRU may transmit user data. In a further example, the WTRU may search a frequency raster for the PSS and the SSS.
1. A wireless transmit/receive unit (WTRU) comprising:
a transceiver; and
a processor, operatively coupled to the transceiver; wherein:
the transceiver is configured to receive a first signal including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), wherein the PSS and the SSS are received in a resource block of a cell, wherein the resource block has a first numerology, wherein the first numerology has a first subcarrier spacing, wherein other resources of the cell at a same time as the resource block have a second numerology with a different subcarrier spacing than the first numerology;
the processor and the transceiver are configured to synchronize to a timing of the cell based on the PSS and the SSS;
the transceiver is configured to receive a second signal in the cell, wherein the second signal has the second numerology; and
the processor and the transceiver are configured to transmit user data.
2. The WTRU of claim 1 , wherein the transceiver and the processor are further configured to search a frequency raster for the PSS and the SSS.
3. The WTRU of claim 2 , wherein the frequency raster varies based on a frequency band being searched.
4. The WTRU of claim 3 , wherein the first numerology is based on the frequency band being searched.
5. The WTRU of claim 1 , wherein the first signal includes a broadcast signal for a plurality of WTRUs and a reference signal.
6. The WTRU of claim 1 , wherein the second signal is received using one or more resources of the other resources, and is received in a part of a cell bandwidth having the second numerology.
7. The WTRU of claim 6 , wherein the second signal is a control channel signal.
8. The WTRU of claim 1 , wherein the transceiver and the processor are configured to transmit a third signal based on the first signal.
9. The WTRU of claim 1 , wherein the transceiver and the processor are configured to transmit a third signal based on the second signal.
10. The WTRU of claim 1 , wherein the transceiver and the processor are configured to transmit a third signal based on the first signal and the second signal.
11. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:
receiving a first signal including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), wherein the PSS and the SSS are received in a resource block of a cell, wherein the resource block has a first numerology, wherein the first numerology has a first subcarrier spacing, wherein other resources of the cell at a same time as the resource block have a second numerology with a different subcarrier spacing than the first numerology;
synchronizing to a timing of the cell based on the PSS and the SSS;
receiving a second signal in the cell, wherein the second signal has the second numerology; and
transmitting user data.
12. The method of claim 11 , further comprising:
searching a frequency raster for the PSS and the SSS.
13. The method of claim 12 , wherein the frequency raster varies based on a frequency band being searched.
14. The method of claim 13 , wherein the first numerology is based on the frequency band being searched.
15. The method of claim 11 , wherein the first signal includes a broadcast signal for a plurality of WTRUs and a reference signal.
16. The method of claim 11 , wherein the second signal is received using one or more resources of the other resources, and is received in a part of a cell bandwidth having the second numerology.
17. The method of claim 16 , wherein the second signal is a control channel signal.
18. The method of claim 11 , further comprising:
transmitting a third signal based on the first signal.
19. The method of claim 11 , further comprising:
transmitting a third signal based on the second signal.
20. The method of claim 11 , further comprising:
transmitting a third signal based on the first signal and the second signal.