US 6,888,810 B2 · Wireless communication device and method of predicting a frame rate in a CDMA communication system

Abstract

In a method of controlling a searcher used in a wireless communication device supplied with a sequence of baseband reception data signals divisible into a sequence of frames, a current frame and preceding frames are selected which satisfy a first relationship. A current and preceding frame rates are statistically processed to obtain frequencies of combinations of the current and the preceding frame rates and to store the frequencies. The first relationship is determined by a difference between a processing time of correlators and the like and a delay time of a delay unit. A next frame search rate judgement portion statistically processes frequencies of combinations of the current and the preceding frame rates so as to calculate a next frame rate candidate in accordance with the first relationship. The next frame rate is predicted by using the next frame rate candidate with reference to a second relationship similar to the first relationship.

Claims21

Dependent claims

A wireless communication device for use in a DS/CDMA mobile communication system, the wireless communication device being operable in response to a sequence of reception signals divisible into a plurality of frames each of which has a frame rate and which is further divided into a plurality of slots, the reception signal sequence being processed with a processing time and a delay time in the wireless communication device, comprising:

processing means for statistically processing preceding frame rates in previously received ones of the frames to produce a result of statistical processing, the previously received frames being determined on the basis of a time difference between the processing time and delay time;
predicting means for predicting a later one of the frame rates in a next one of the frames on the basis of the result of statistical processing to produce a predicted frame rate of the later one of the frame, the next frame being determined with reference to the time difference between the processing time and the delay time;
and
executing means for executing a predetermined operation within candidate ones of the slots determined for the predicted frame rate.

1 more element

A circuit operable in response to a sequence of frame rate signals derived from a sequence of reception signals in a wireless communication device of a mobile communication system, the reception signal sequence being processed with a processing time and a delay time in the wireless communication device and including a reference frame, a previous frame sequence preceding the reference frame, and a later frame following the reference frame while the circuit is used for calculating a later frame rate of the later frame, comprising:

processing means for statistically processing a reference frame rate extracted from the reference frame and a previous frame rate extracted from the preceding frame sequence selected with reference to a time difference between the processing time and the delay time to successively store a frame rate candidate in the later frame as a result of statistically processing;
and
selecting means for selecting the frame rate candidate from the later frame determined with reference to the time difference to produce the frame rate candidate as the later frame rate.

Dependencies are inferred from the claim text.

Wireless communication device and method of predicting a frame rate in a CDMA communication system

Life of this patent

Wireless communication device and method of predicting a frame rate in a CDMA communication system

Life of this patent

Abstract

Claims21