Signal measurement apparatus and method for handover in a mobile communication system

A method for measuring by a UE (User Equipment) a synchronization signal on a control channel and second Node B information from a second Node B in a system including a first Node B, the second Node B adjacent to the first Node B, and the UE in a cell occupied by the first Node B, the first Node B and the UE using a TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) communication technique over a frame having a plurality of time periods, a downlink channel being transmitted from the first Node B to the UE over at least one time period among the plurality of time periods in the frame, an uplink channel being transmitted from the UE to the first Node B over at least one time period among the remaining time periods except the at least one time period over which the downlink channel is transmitted, the UE and the second Node B performing communication by a communication technique different from that of the TDD CDMA communication technique, the synchronization signal for synchronizing the UE with the second Node B and the control channel indicating the second Node B information being transmitted over at lest one downlink channel transmitted from the second Node B to the UE, the method comprising the step of:

• changing a position of the time period over which the downlink channel is transmitted from the first Node B to the UE, and changing a position of the time period over which the uplink channel is transmitted from the UE to the first Node B, so that the time period of the control channel transmitted from the second Node B to the UE is located within a previous subframe and within one of a next subframe and a frame.

A method for measuring by a UE (User Equipment) a synchronization signal on a control channel and second Node B information from a second Node B in a system including a first Node B, the second Node B adjacent to the first Node B, a radio network controller (RNC) for managing the first Node B, and the UE in a cell occupied by the first Node B, the first Node B and the UE using a TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) communication technique over a frame having a plurality of time periods, a downlink channel being transmitted from the first Node B to the UE over at least one time period among the plurality of time periods in the frame, an uplink channel being transmitted from the UE to the first Node B over at least one time period among the remaining time periods except the at least one time period over which the downlink channel is transmitted, the UE and the second Node B performing communication by a frequency band or a communication technique different from that of the TDD CDMA communication technique, the synchronization signal for synchronizing the UE with the second Node B and the control channel indicating the second Node B information being transmitted over at least one downlink channel transmitted from the second Node B to the UE, the method comprising the steps of:

• determining by the RNC all parameters available for measurement of the synchronization signal and the second Node B information, transmitting the determined parameters to the first Node B during radio link setup, and transmitting the determined parameters to the UE during radio bearer setup;
• if it is recognized by the RNC that measurement of the synchronization signal and the second Node B information is necessary, transmitting to the first Node B and the UE parameter selection information for measuring the synchronization signal and the second Node B information;
• changing by the first Node B and the UE a position of a downlink time period over which the downlink channel is transmitted from the first Node B to the UE and a position of an uplink time period over which the uplink channel is transmitted from the UE to the first Node B, according to parameters selected from all the parameters based on the parameter selection information;
• and
• receiving by the UE the synchronization signal and the second Node B information transmitted from the second Node B in the time periods except the changed downlink time period and the changed uplink time period among the plurality of time periods.

A method for measuring by a UE (User Equipment) a synchronization signal on a control channel and second Node B information from a second Node B in a system including a first Node B, the second Node B adjacent to the first Node B, a radio network controller (RNC) for managing the first Node B, and the UE in a cell occupied by the first Node B, the first Node B and the UE using a TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) communication technique over a frame having a plurality of time periods, a downlink channel being transmitted from the first Node B to the UE over at least one time period among the plurality of time periods in the frame, an uplink channel being transmitted from the UE to the first Node B over at least one time period among the remaining time periods except the at least one time period over which the downlink channel is transmitted, the UE and the second Node B performing communication by a frequency band or a communication technique different from that of the TDD CDMA communication technique, the synchronization signal for synchronizing the UE with the second Node B and the control channel indicating the second Node B information being transmitted over at lest one downlink channel transmitted from the second Node B to the UE, the method comprising the steps of:

• determining by the RNC all parameters available for measurement of the synchronization signal and the second Node B information, transmitting any one of the determined parameters to the first Node B and the UE if the RNC recognizes that the UE is required to measure the synchronization signal and the second Node B information;
• changing by the first Node B and the UE a position of a downlink time period over which the downlink channel is transmitted from the first Node B to the UE and a position of an uplink time period over which the uplink channel is transmitted from the UE to the first Node B, according to parameters selected by the RNC based on parameter selection information;
• and
• receiving by the UE the synchronization signal and the second Node B information transmitted from the second Node B in time periods except the changed downlink time period and the changed uplink time period among the plurality of time periods.

An apparatus for measuring by a UE (User Equipment) a synchronization signal on a control channel and second Node B information from a second Node B in a system-including a first Node B, the second Node B adjacent to the first Node B, a radio network controller (RNC) for managing the first Node B, and the UE in a cell occupied by the first Node B, the first Node B and the UE using a TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) communication technique over a frame having a plurality of time periods, a downlink channel being transmitted from the first Node B to the UE over at least one time period among the plurality of time periods in the frame, an uplink channel being transmitted from the UE to the first Node B over at least one time period among the remaining time periods except the at least one time eriod over which the downlink channel is transmitted, the UE and the second ode B performing communication by a frequency band or a communication technique different from that of the TDD CDMA communication technique, the synchronization signal for synchronizing the UE with the second Node B and the control channel indicating the second Node B information being transmitted over at lest one downlink channel transmitted from the second Node B to the UE, the apparatus comprising:

• the RNC for determining all parameters available for measurement of the synchronization signal and the second Node B information, transmitting the determined parameters to the first Node B during radio link setup, transmitting the determined parameters to the UE during radio bearer setup, and transmitting to the first Node B and the UE parameter selection information for measuring the synchronization signal and the second Node B information, if it is recognized that measurement of the synchronization signal and the second Node B information is necessary;
• the first Node B for changing a position of a downlink time period over which the downlink channel is transmitted from the first Node B to the UE and a position of an uplink time period over which the uplink channel is transmitted from the UE to the first Node B, according to parameters selected from all the parameters based on the parameter selection information;
• and
• the UE for changing a position of a downlink time period over which the downlink channel is transmitted from the first Node B to the UE and a position of an uplink time period over which the uplink channel is transmitted from the UE to the first Node B, according to parameters selected from all the parameters based on the parameter selection information, and receiving the synchronization signal and the second Node B information transmitted from the second Node B in time periods except the changed downlink time period and the changed uplink time period among the plurality of time periods.

An apparatus for measuring by a UE (User Equipment) a synchronization signal on a control channel and second Node B information from a second Node B in a system including a first Node B, the second Node B adjacent to the first Node B, a radio network controller (RNC) for managing the first Node B, and the UE in a cell occupied by the first Node B, the first Node B and the UE using a TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) communication technique over a frame having a plurality of time periods, a downlink channel being transmitted from the first Node B to the UE over at least one time period among the plurality of time periods in the frame, an uplink channel being transmitted from the UE to the first Node B over at least one time period among the remaining time periods except the at least one time period over which the downlink channel is transmitted, the UE and the second Node B performing communication by a frequency band or a communication technique different from that of the TDD CDMA communication technique, the synchronization signal for synchronization with the second Node B and the control channel indicating the second Node B information being transmitted over at lest one downlink channel transmitted from the second Node B to the UE, the apparatus comprising:

• the RNC for determining all parameters available for measurement of the synchronization signal and the second Node B information, transmitting any one of the determined parameters to the first Node B and the UE if it is recognized that the UE is required to measure the synchronization signal and the second Node B information;
• the first Node B for changing a position of a downlink time period over which the downlink channel is transmitted from the first Node B to the UE and a position of an uplink time period over which the uplink channel is transmitted from the UE to the first Node B, according to parameters selected by the RNC based on parameter selection information;
• and
• the UE for changing a position of a downlink time period over which the downlink channel is transmitted from the first Node B to the UE and a position of an uplink time period over which the uplink channel is transmitted from the UE to the first Node B, according to parameters selected by the RNC based on parameter selection information, and receiving the synchronization signal and the second Node B information transmitted from the second Node B in time periods except the changed downlink time period and the changed uplink time period among the plurality of time periods.