Dedicated synchronization signal for OFDMA system
View Patent ↗A mobile node, method, apparatus and system for neighbor cell identification and measurements in a wireless network. A first synchronization signal is provided a first base station, wherein the received first synchronization signal is on a predetermined frequency of a transmission bandwidth. Initial synchronization is performed. A second synchronization signal is provided, wherein the second synchronization signal is outside of the predetermined frequency of the transmission bandwidth. Neighbor cell identification based on the received second synchronization signal.
1. An apparatus, comprising:
a receiver unit configured to receive a first synchronization signal, wherein the first synchronization signal has a first operating bandwidth corresponding in size to at least an operating bandwidth of the receiver unit that is a predetermined portion of an operating bandwidth of a network;
a synchronization unit configured to provide initial synchronization with the network,
wherein the receiver unit is further configured to receive a second synchronization signal, wherein the second synchronization signal has a second operating bandwidth that is outside the first operating bandwidth of the first synchronization signal, wherein the second synchronization signal is provided in a different sequence than the first synchronization signal in a frequency domain, so that the second synchronization signal is not detected during the initial synchronization, wherein the second synchronization signal is configured to depend upon an expected number of narrowband mobile stations, and
wherein the apparatus is further configured to perform neighbor cell identification based at least on the second synchronization signal.
2. The apparatus according to claim 1 , wherein the receiver unit is configured to receive the second synchronization signal, wherein the second synchronization signal includes system information for a wireless network.
3. The apparatus according to claim 1 , wherein the receiver unit is configured to receive the second synchronization signal, and wherein the neighbor cell identification is utilized for cell reselection.
4. The apparatus according to claim 3 , wherein the receiver unit is configured to receive the second synchronization signal, and wherein the neighbor cell identification is further utilized for handover.
5. The apparatus according to claim 1 , further comprising a second receiver unit configured to receive the second synchronization signal.
6. A method, comprising:
providing a first synchronization signal from a base station to a mobile node wherein the first synchronization signal has a first operating bandwidth corresponding in size to at least an operating bandwidth of the mobile node that is a predetermined portion of an operating bandwidth of a network;
providing a second synchronization signal from the base station to the mobile node, wherein the second synchronization signal has a second operating bandwidth that is outside the first operating bandwidth of the first synchronization signal, wherein the second synchronization signal is provided in a different sequence than the first synchronization signal in a frequency domain, so that the second synchronization signal is not detected during initial synchronization, and wherein the second synchronization signal is configured to depend upon an expected number of narrowband mobile stations;
identifying neighbor cells in the network based at least on the second synchronization signal; and
synchronizing the mobile node with the identified neighbor cells.
7. The method according to claim 6 , wherein providing the second synchronization signal further comprises providing the second synchronization signal that is smaller than the operating bandwidth of the network.
8. The method according to claim 7 , further comprising performing cell reselection based on the second synchronization signal.
9. The method according to claim 7 , further comprising performing handover based on the second synchronization signal.
10. The method according to claim 6 , further comprising providing system information in the second synchronization signal.
11. An apparatus, comprising:
at least one receiving means for receiving a first synchronization signal from a base station and a second synchronization signal from a base station, wherein the first synchronization signal has a first operating bandwidth corresponding in size to at least an operating bandwidth of the receiving means that is a predetermined portion of an operating bandwidth of a network, wherein the second synchronization signal has a second operating bandwidth that is outside the first operating bandwidth of the first synchronization signal, and wherein the second synchronization signal is configured to depend upon an expected number of narrowband mobile stations;
a synchronization means for performing initial synchronization with the network, wherein the second synchronization signal is provided in a different sequence than the first synchronization signal in a frequency domain, so that the second synchronization signal is not detected during the initial synchronization; and
an identification means for identifying a neighbor cell based at least on the second synchronization signal,
wherein the apparatus is configured to provide synchronization with the identified neighbor cell.
12. The apparatus according to claim 11 , wherein the at least one receiving means is configured to receive the second synchronization signal, wherein the second synchronization signal includes system information for a wireless network.
13. The apparatus according to claim 11 , wherein the identification means identifies the neighbor cell for cell reselection.
14. The apparatus according to claim 13 , wherein the identification means identifies the neighbor cell for handover.
15. The apparatus according to claim 11 , wherein in the receiving means the second synchronization signal includes system information.
16. An apparatus, comprising:
a transmitter configured to transmit a first synchronization signal, wherein the first synchronization signal has a first operating bandwidth corresponding in size to at least an operating bandwidth of a mobile node that is a predetermined portion of an operating bandwidth of a network,
wherein the transmitter is further configured to transmit at least one second synchronization signal, wherein the at least one second synchronization signal has a second operating bandwidth that is outside the first operating bandwidth of the first synchronization signal, wherein the at least one second synchronization signal is provided in a different sequence than the first synchronization signal in a frequency domain, so that the at least one second synchronization signal is not detected during initial synchronization, and wherein the at least one second synchronization signal is configured to depend upon an expected number of narrowband mobile stations.
17. The apparatus according to claim 16 , wherein the at least one second synchronization signal includes system information for a wireless network.
18. The apparatus according to claim 16 , wherein the transmitter unit is configured to transmit a plurality of second synchronization signals.
19. A system, comprising:
a plurality of cells in a network;
a base station, wherein the base station comprises, a transmitter configured to transmit a first synchronization signal, wherein the first synchronization signal has a first operating bandwidth corresponding in size to at least an operating bandwidth of a mobile node that is a predetermined portion of an operating bandwidth of the network, and is further configured to transmit at least one second synchronization signal, wherein the at least one second synchronization signal has a second operating bandwidth that is outside the first operating bandwidth of the first synchronization signal, wherein the at least one second synchronization signal is provided in a different sequence than the first synchronization signal in a frequency domain, so that the at least one second synchronization signal is not detected during initial synchronization, and wherein the at least one second synchronization signal is configured to depend upon an expected number of narrowband mobile stations; and
a mobile node, wherein the mobile node comprises, a receiver unit configured to receive the first synchronization signal, and is configured to receive one of the at least one second synchronization signal,
wherein the mobile node identifies the cells in the network based at least on the received second synchronization signal.