Synchronization in a flexible bandwidth wireless network
In a wireless network, a primary synchronization signal and a secondary synchronization signal are sent at a predetermined bandwidth in a transmission. The predetermined bandwidth is a lowest operating bandwidth of the wireless network. Data is also sent in the transmission using an operating bandwidth greater than the lowest operating bandwidth.
1. A user equipment comprising:
a receiver; and
a processor; wherein:
the receiver and the processor are configured to process signals in a first bandwidth, the processed signals including a primary synchronization signal and a secondary synchronization signal;
the processor is configured to determine a cell bandwidth from an indication of the cell bandwidth included in at least one of the processed signals in the first bandwidth, wherein the cell bandwidth has a larger bandwidth than the first bandwidth and the first bandwidth is a portion of the cell bandwidth; and
the processor and the receiver are configured to receive signals in the cell bandwidth including signals having at least a portion of those signals' bandwidth outside of the first bandwidth.
2. The user equipment of claim 1 , wherein the first bandwidth is a lowest potential cell bandwidth.
3. The user equipment of claim 1 , wherein the processor is further configured to determine time alignment synchronization based on the primary synchronization signal and the secondary synchronization signal.
4. The user equipment of claim 1 , wherein the processor and the receiver are configured to demodulate system information from a broadcast channel based on the primary synchronization signal and the secondary synchronization signal.
5. The user equipment of claim 1 , wherein at least one of the received signals in the cell bandwidth includes transport channel data.
6. The user equipment of claim 1 , wherein the secondary synchronization signal is included in a portion of a time slot and is offset from a start of the time slot.
7. The user equipment of claim 1 , wherein the indication of the cell bandwidth indicates the cell bandwidth out of a set of potential cell bandwidths.
8. A method comprising:
processing, by a user equipment, signals in a first bandwidth, the processed signals including a primary synchronization signal and a secondary synchronization signal;
determining, by the user equipment, a cell bandwidth from an indication of the cell bandwidth included in at least one of the processed signals in the first bandwidth, wherein the cell bandwidth has a larger bandwidth than the first bandwidth and the first bandwidth is a portion of the cell bandwidth; and
receiving, by the user equipment, signals in the cell bandwidth including signals having at least a portion of those signals' bandwidth outside of the first bandwidth.
9. The method of claim 8 , wherein the first bandwidth is a lowest potential cell bandwidth.
10. The method of claim 8 , comprising determining, by the user equipment, time alignment synchronization based on the primary synchronization signal and the secondary synchronization signal.
11. The method of claim 8 , comprising demodulating system information from a broadcast channel based on the primary synchronization signal and the secondary synchronization signal.
12. The method of claim 8 , wherein at least one of the received signals in the cell bandwidth includes transport channel data.
13. The method of claim 8 , wherein the secondary synchronization signal is included in a portion of a time slot and is offset from a start of the time slot.
14. The method of claim 8 , wherein the indication of the cell bandwidth indicates the cell bandwidth out of a set of potential cell bandwidths.
15. A base station comprising:
a transmitter; and
a processor; wherein:
the transmitter and the processor are configured to transmit, in a first bandwidth, signals including a primary synchronization signal and a secondary synchronization signal, wherein the signals in the first bandwidth include an indication of a cell bandwidth, wherein the cell bandwidth has a larger bandwidth than the first bandwidth and the first bandwidth is a portion of the cell bandwidth; and
the transmitter and the processor are configured to transmit signals in the cell bandwidth including signals having at least a portion of those signals' bandwidth outside of the first bandwidth.
16. The base station of claim 15 , wherein the first bandwidth is a lowest potential cell bandwidth.
17. The base station of claim 15 , comprising a receiver, wherein the receiver, the transmitter, and the processor are configured to transmit and receive using time division duplex in the cell bandwidth.
18. The base station of claim 15 , wherein the processor and the transmitter are configured to transmit system information in a broadcast channel having a transmission timing synchronized with the primary synchronization signal and the secondary synchronization signal.
19. The base station of claim 15 , wherein at least one of the transmitted signals in the cell bandwidth includes transport channel data.
20. The base station of claim 15 , wherein the secondary synchronization signal is transmitted in a portion of a time slot and the secondary synchronization signal is offset from a start of the time slot.
21. The base station of claim 15 , wherein the indication of the cell bandwidth indicates the cell bandwidth out of a set of potential cell bandwidths.
22. A user equipment comprising:
a receiver; and
a processor; wherein:
the receiver and the processor are configured to process a received signal burst in a predetermined first bandwidth, the processed signal burst including a primary synchronization signal and a secondary synchronization signal and including an indication of a second bandwidth, wherein the second bandwidth is different than the first bandwidth, the first bandwidth is less than a cell bandwidth; and
the processor and the receiver are configured to scan for signals in the second bandwidth including signals having at least a portion of those signals' bandwidth outside of the first bandwidth.
23. The user equipment of claim 22 , wherein a frame timing is derived from the received signal burst.
24. The user equipment of claim 22 , wherein a plurality of signal bursts are received in the predetermined first bandwidth, and each signal burst has a different timing than the other signal bursts in the plurality of signal bursts.
25. The user equipment of claim 22 , wherein the receiver and the processor receive an indication of the cell bandwidth.
26. The user equipment of claim 25 , wherein the indication of the cell bandwidth indicates the cell bandwidth out of a set of potential cell bandwidths.
27. The user equipment of claim 22 , wherein the primary synchronization signal and the secondary synchronization signal are used to demodulate system information from a broadcast channel.
28. The user equipment of claim 22 , further comprising a transmitter, wherein the receiver, the transmitter, and the processor are configured to transmit and receive using time division duplex.
29. A method comprising:
processing, by a user equipment, a signal burst in a predetermined first bandwidth, the processed signal burst including a primary synchronization signal and a secondary synchronization signal and including an indication of a second bandwidth, the second bandwidth different than the first bandwidth, the first bandwidth is less than a cell bandwidth; and
the user equipment is configured to scan for signals in the second bandwidth including signals having at least a portion of those signals' bandwidth outside of the first bandwidth.
30. The method of claim 29 , comprising determining, by the user equipment, a frame timing derived from the signal burst.
31. The method of claim 29 , wherein a plurality of signal bursts are received in the predetermined first bandwidth, and each signal burst has a different timing than the other signal bursts in the plurality of signal bursts.
32. The method of claim 29 , further comprising receiving, by the user equipment, an indication of the cell bandwidth.
33. The method of claim 32 , wherein the indication of the cell bandwidth indicates the cell bandwidth out of a set of potential cell bandwidths.
34. The method of claim 29 , further comprising demodulating, by the user equipment, system information from a broadcast channel using the primary synchronization signal and the secondary synchronization signal.
35. The method of claim 29 , further comprising transmitting and receiving, by the user equipment, using time division duplex.
36. A base station comprising:
a transmitter; and
a processor; wherein:
the transmitter and the processor are configured to transmit a signal burst in a predetermined first bandwidth, the signal burst including a primary synchronization signal and a secondary synchronization signal and including an indication of a second bandwidth, the second bandwidth different than the first bandwidth, the first bandwidth is less than a cell bandwidth; and
the transmitter and the processor are configured to transmit signals in the second bandwidth including signals having at least a portion of those signals' bandwidth outside of the first bandwidth.
37. The base station of claim 36 , wherein a plurality of signal bursts are transmitted in the predetermined first bandwidth, and each signal burst has a different timing than the other signal bursts in the plurality of signal bursts.
38. The base station of claim 36 , wherein the transmitter and the processor transmit an indication of a cell bandwidth.
39. The base station of claim 38 , wherein the indication of the cell bandwidth indicates the cell bandwidth out of a set of potential cell bandwidths.
40. The base station of claim 36 , further comprising a receiver, wherein the receiver, the transmitter, and the processor are configured to transmit and receive using time division duplex.