Mobile station apparatus, mobile communication system, and carrier detecting method
AssigneeNtt Docomo, Inc.
InventorsYoshiaki Ofuji, Motohiro Tanno, Takehiro Nakamura
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Abstract
For detecting service carriers, a received power measuring section initially carries out received power measurement in a frequency band assigned to the system, a frequency limiting section limits a service carrier seeking frequency range to the vicinity of a frequency where thus measured received power exceeds a threshold, the received power measuring section measures the received power at a frequency where a service carrier may exist within this frequency range, and the controller chooses a frequency yielding a high measured received power as a service carrier candidate frequency. Then, the cell search executing section initially executes a cell search for this candidate frequency.
Claims21
A mobile station apparatus for detecting a carrier containing information necessary for a base station apparatus employing a CDMA scheme to shift to an in-zone standby state, said mobile station apparatus comprising:
- a measuring means for measuring received power of a received frequency fmi (1≦i≦I), wherein i is the frequency number of the received frequency and I is the total number of frequencies;
- a limiting means for limiting a frequency range within which said carrier is to be sought to a limited frequency range containing a frequency fmj (1≦j≦I, wherein j is the frequency number) having a measured received power that is greater than a predetermined value, and there is a frequency, J (J<I), within the limited frequency range;
- a control means for choosing a number of K frequencies (K<J) in said limited frequency range as candidates for said carrier;
- and
- a search means for carrying out a cell search for a number of K frequencies chosen as said candidates so as to detect said carrier.
A carrier detecting method for detecting in a mobile station apparatus a carrier containing information necessary for a base station apparatus employing a CDMA scheme to shift to an in-zone standby state, said method comprising:
- a measuring step of measuring a received power of a received frequency fmi (1≦i≦I), wherein i is the frequency number of the received frequency and I is the total number of frequencies;
- a limiting step of limiting a frequency range within which said carrier is to be sought to a limited frequency range containing a frequency fmj (1≦j≦I, wherein j is the frequency number) having a measured received power that I greater than a predetermined value, and there is a frequency, J (J<I), within the limited frequency range;
- a control step of choosing a number of K frequencies (K<J) in said frequency range limited by said limiting step as candidates for said carrier;
- and
- a search step of carrying out a cell search for a number of K frequencies chosen as said candidates in said control step so as to detect said carrier.
Dependencies are inferred from the claim text.