Method and apparatus for broadcasting synchronization signals and system information in a new type carrier

1. A method performed by a base station for broadcasting in a wireless communication network, the method comprising:

selecting first time-frequency resources in dependence on a cell identity of a network cell provided by the base station;

broadcasting a synchronization signal for the network cell on the first transmission resources, the synchronization signal comprising at least one of a primary synchronization signal and a secondary synchronization signal, for use by wireless devices in gaining synchronization with the network cell;

selecting second time-frequency resources in dependence on the first time-frequency resources, the second time-frequency resources being selected from among a plurality of candidate time-frequency resources according to a mapping function that maps different candidates for the first time-frequency resources to different candidates for the second time-frequency resources; and

broadcasting system information on the second time-frequency resources, the system information being broadcasted on a broadcast channel of the network cell using the second time-frequency resources and comprising cell access information, for use by wireless devices in accessing the network cell.

2. The method according to claim 1 , wherein the first time-frequency resources are located within a subframe.

3. The method according to claim 1 , further comprising muting the remaining ones among the plurality of candidate time-frequency resources not selected as said second time-frequency resources, based on allocating zero transmission power to them when broadcasting the system information.

4. The method according to claim 1 , wherein the second time-frequency resources are positioned in a different subframe than the first time-frequency resources.

5. A base station for broadcasting in a wireless communication network, the base station comprising:

transmitter circuitry; and

processing circuitry configured to:

select first time-frequency resources in dependence on a cell identity of a network cell provided by the base station;

broadcast, via the transmitter circuitry, a synchronization signal for the network cell on the first transmission resources, the synchronization signal comprising at least one of a primary synchronization signal and a secondary synchronization signal, for use by wireless devices in gaining synchronization with the network cell;

select second time-frequency resources in dependence on the first time-frequency resources, the second time-frequency resources being selected from among a plurality of candidate time-frequency resources according to a mapping function that maps different candidates for the first time-frequency resources to different candidates for the second time-frequency resources; and

broadcast, via the transmitter circuitry, system information on the second time-frequency resources, the system information being broadcasted on a broadcast channel of the network cell using the second time-frequency resources and comprising cell access information, for use by wireless devices in accessing the network cell.

6. A method performed by a User Equipment (UE) in a wireless communication system, for receiving information broadcasted from a base station, the method comprising:

receiving a synchronization signal from the base station for a network cell provided by the base station, the synchronization signal being received on first time-frequency resources selected by the base station in dependence on a cell identity of the network cell and comprising at least one of a primary synchronization signal and a secondary synchronization signal;

identifying second time-frequency resources in dependence on the first time-frequency resources, the second time-frequency resources being identified from among a plurality of candidate time-frequency resources according to a mapping function that maps different candidates for the first time-frequency resources to different candidates for the second time-frequency resources; and

receiving system information on the second time-frequency resources, the system information being broadcasted by the base station on a broadcast channel of the network cell using the second time-frequency resources and comprising cell access information, for use by the wireless device in accessing the network cell.

7. The method according to claim 6 , wherein the first time-frequency resources are located within a subframe.

8. The method according to claim 6 , wherein the second time-frequency resources are positioned in a different subframe than the first time-frequency resources.

9. A User Equipment (UE) for receiving information broadcasted from a base station in a wireless communication system, the UE comprising:

receiver circuitry; and

processing circuitry configured to:

receive, via the receiver circuitry a synchronization signal from the base station for a network cell provided by the base station, the synchronization signal being received on first time-frequency resources selected by the base station in dependence on a cell identity of the network cell and comprising at least one of a primary synchronization signal and a secondary synchronization signal;

identify second time-frequency resources in dependence on the first time-frequency resources, the second time-frequency resources being identified from among a plurality of candidate time-frequency resources according to a mapping function that maps different candidates for the first time-frequency resources to different candidates for the second time-frequency resources; and

receive, via the receiver circuitry, system information on the second time-frequency resources, the system information being broadcasted by the base station on a broadcast channel of the network cell using the second time-frequency resources and comprising cell access information, for use by the wireless device in accessing the network cell.