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

• US 7,200,124 B2
• Filed: 11/18/2002
• Issued: 04/03/2007
• Est. Priority Date: 11/17/2001
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Sung-Ho, Hwang, Sung-Oh, Kwak, Yong-Jun, Lee, Ju-Ho, Lee, Kook-Heui, Lee, Hye-Young, Park, Joon-Goo, Lee, Hyeon-Woo, Chang, Jin-Weon, Kim, Hyoung-Gwan, XiaoQiang, Li, Kim, Jung-Gon, Ting, Wang, Shuwei, Zhang, GaoKe, Du
• Primary Examiner(s): Gary; Erika A.
• Application Number:
  US10/298,341
• Publication Number:
  US 20030117980A1
• Time in Patent Office: 1,597 Days
• Field of Search: None
• US Class Current: 370/324
• CPC Class Codes: H04W 36/0094 Definition of hand-off measurement parameters
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/142 over the same radio air interface technology

Abstract

An RNC determines parameters available for measurement of a synchronization signal and second Node B information from a second Node B, transmits the determined parameters to a first Node B during radio link setup and to a UE during radio bearer setup, and transmits parameter selection information to the first Node B and the UE, if it is recognized that measurement of the synchronization signal and the second Node B information is necessary. The first Node B changes a position of a downlink time period over which a downlink channel is transmitted from the first Node B to the UE and a position of an uplink time period over which an uplink channel is transmitted from the UE to the first Node B, according to parameters selected from the parameters. The UE receives the synchronization signal and the second Node B information in the remaining time periods except the changed downlink time period and the changed uplink time period among the plurality of time periods.

Claims

1. 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 TDD communication technique using a frequency band 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 from the second Node B to the UE over at least one time period among the plurality of time periods, the method comprising the step of:

changing a position of the downlink time period over which the downlink channel is transmitted from the first Node B to the UE, and changing a position of the uplink 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.

2. The method of claim 1, wherein a first time period and a second time period among a plurality of time periods in the previous subframe are changed to the downlink time period and the uplink time period, respectively, and a third and fourth time periods each adjacent to a second switching point existing in the next subframe are changed to the downlink time period and the uplink time period, respectively.

3. The method of claim 1, wherein a first and second time periods each adjacent to one switching point of two switching points existing in each of the previous subframe and the next subframe are changed to the downlink time period and the uplink time period.

4. The method of claim 1, wherein a first time period and a second time period being spaced apart at the greatest distance from each other among a plurality time periods existing in the previous subframe and the next subframe are changed to the uplink time period and the downlink time period.

5. The method of claim 1, wherein a first four time periods among a plurality of time periods existing in a first subframe among four consecutive subframes are changed to one of the uplink time period and the downlink time period, and a last four time periods among a plurality of time periods existing in the last subframe among the four consecutive subframes are changed to one of the uplink time period and the downlink time period.

6. The method of claim 1, wherein at least two orthogonal codes among a plurality of channelization orthogonal codes used in two time periods among a plurality of time periods existing in a first subframe among four consecutive subframes are changed to one of orthogonal codes for the uplink time period and orthogonal codes for the downlink time period, and at least two orthogonal codes among a plurality of channelization orthogonal codes used in two time periods among a plurality of time periods existing in the last subframe among the four consecutive subframes are changed to one of orthogonal codes for the uplink time period and orthogonal codes for the downlink time period.

7. 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 least 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.

8. The method of claim 7, wherein a first time period and a second time period among a plurality of time periods in the previous subframe are changed to the downlink time period and the uplink time period, respectively, and a third and a fourth time periods each adjacent to a second switching point existing in the next subframe are changed to the downlink time period and the uplink time period, respectively.

9. The method of claim 7, wherein a first and a second time periods each adjacent to one switching point of two switching points existing in each of the previous subframe and the next subframe are changed to the downlink time period and the uplink time period.

10. The method of claim 7, wherein a first time period and a second time period being spaced apart at the greatest distance from each other among a plurality time periods existing in the previous subframe and the next subframe are changed to the uplink time period and the downlink time period.

11. The method of claim 7, wherein a first four time periods among a plurality of time periods existing in a first subframe among four consecutive subframes are changed to one of the uplink time period and the downlink time period, and a last four time periods among a plurality of time periods existing in the last subframe among the four consecutive subframes are changed to one of the uplink time period and the downlink time period.

12. The method of claim 7, wherein at least two orthogonal codes among a plurality of channelization orthogonal codes used in two time periods among a plurality of time periods existing in a first subframe among four consecutive subframes are changed to one of orthogonal codes for the uplink time period and orthogonal codes for the downlink time period, and at least two orthogonal codes among a plurality of channelization orthogonal codes used in two time periods among a plurality of time periods existing in the last subframe among the four consecutive subframes are changed to one of orthogonal codes for the uplink time period and orthogonal codes for the downlink time period.

13. 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.

14. The method of claim 13, wherein each of the parameters comprises a measurement period starting point (MPSP), a measurement period (MP), a measurement period interval (MPI), a measurement period sequence (MPS), and a measurement period sequence repetition number (MPSRN).

15. The method of claim 13, wherein the parameter selection information is an index indicating any one of the parameters.

16. The method of claim 13, wherein the parameters are determined based on positions of a downlink time period and an uplink time period, where the time periods of the control channel transmitted from the second Node B can be located within a previous subframe and within one of a next subframe and a frame.

17. The method of claim 16, wherein the changed downlink time period and the changed uplink time period in the previous subframe and the next subframe occur in succession, and the changed downlink time period and the changed uplink time period in the previous subframe are spaced apart as far as possible from the changed downlink time period and the changed uplink time period in the next subframe.

18. 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 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.

19. The method of claim 18, wherein each of the parameters comprises a measurement period starting point (MPSP), a measurement period (MP), a measurement period interval (MPI), a measurement period sequence (MPS), and a measurement period sequence repetition number (MPSRN).

20. The method of claim 18, wherein the parameter selection information is an index indicating any one of the parameters.

21. The method of claim 18, wherein the parameters are determined based on positions of a downlink time period and an uplink time period, where the time periods of the control channel transmitted from the second Node B can be located within a previous subframe and within one of a next subframe and a frame.

22. The method of claim 21, wherein the changed downlink time period and the changed uplink time period in the previous subframe and the next subframe occur in succession, and the changed downlink time period and the changed uplink time period in the previous subframe are spaced apart as far as possible from the changed downlink time period and the changed uplink time period in the next subframe.

23. 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 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 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.

24. The apparatus of claim 23, wherein each of the parameters comprises a measurement period starting point (MPSP), a measurement period (MP), a measurement period interval (MPI), a measurement period sequence (MPS), and a measurement period sequence repetition number (MPSRN).

25. The apparatus of claim 23, wherein the parameter selection information is an index indicating any one of the parameters.

26. The apparatus of claim 23, wherein the parameters are determined based on positions of a downlink time period and an uplink time period, where the time periods of the control channel transmitted from the second Node B can be located within a previous subframe and within one of a next subframe and a frame.

27. The apparatus of claim 26, wherein the changed downlink time period and the changed uplink time period in the previous subframe and the next subframe occur in succession, and the changed downlink time period and the changed uplink time period in the previous subframe are spaced apart as far as possible from the changed downlink time period and the changed uplink time period in the next subframe.

28. 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 least 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.

29. The apparatus of claim 28, wherein each of the parameters comprises a measurement period starting point (MPSP), a measurement period (MP), a measurement period interval (MPI), a measurement period sequence (MPS), and a measurement period sequence repetition number (MPSRN).

30. The apparatus of claim 28, wherein the parameter selection information is an index indicating any one of the parameters.

31. The apparatus of claim 28, wherein the parameters are determined based on positions of a downlink time period and an uplink time period, where the time periods of the control channel transmitted from the second Node B can be located within a previous subframe and within one of a next subframe and a frame.

32. The apparatus of claim 31, wherein the changed downlink time period and the changed uplink time period in the previous subframe and the next subframe occur in succession, and the changed downlink time period and the changed uplink time period in the previous subframe are spaced apart as far as possible from the changed downlink time period and the changed uplink time period in the next subframe.