Paging receiver with improved synchronization techniques

A method for intermittently receiving a transmission signal after synchronization establishment, the transmission signal including a frame synchronization signal and a frame identifying signal, the method comprising the steps of:

• storing an ideal frame identifying value which was produced at a preceding intermittent receiving timing;
• detecting a received frame synchronization signal from a received transmission signal;
• detecting a received frame identifying signal from the received transmission signal to produce a received frame identifying value;
• comparing the received frame identifying value with the ideal frame identifying value;
• determining intermittent receiving timing based on the ideal frame identifying value when either the received frame synchronization signal or the received frame identifying signal is not detected;
• determining intermittent receiving timing based on the ideal frame identifying value when the received frame identifying value is coincident with the ideal frame identifying value;
• storing a next ideal frame identifying value which should be received at a next intermittent receiving timing, the next ideal frame identifying value being produced based on the ideal frame identifying value;
• determining whether a predicted frame identifying value which was predicted at the preceding intermittent receiving timing is stored when the received frame identifying value is not coincident with the ideal frame identifying value;
• comparing the received frame identifying value with the predicted frame identifying value when the predicted frame identifying value is stored;
• determining intermittent receiving timing based on the received frame identifying value when the received frame identifying value is coincident with the predicted frame identifying value;
• determining intermittent receiving timing based on both the ideal frame identifying value and the received frame identifying value when the received frame identifying value is not coincident with the predicted frame identifying value;
• storing a next predicted frame identifying value which should be received at the next intermittent receiving timing, the next predicted frame identifying value being predicted based on the received frame identifying value when the received frame identifying value is not coincident with the predicted frame identifying value;
• and
• storing a next ideal frame identifying value which should be received at the next intermittent receiving timing, the next ideal frame identifying value being produced based on the ideal frame identifying value when the received frame identifying value is not coincident with the predicted frame identifying value.

A wireless selective calling receiver for intermittently receiving a transmission signal after synchronization establishment, the transmission signal including a frame synchronization signal and a frame identifying signal, the receiver comprising:

• storage means for storing an ideal frame identifying value which was produced at a preceding intermittent receiving timing;
• first means for detecting a received frame synchronization signal from a received transmission signal;
• second means for detecting a received frame identifying signal from the received transmission signal to produce a received frame identifying value;
• comparing means for comparing the received frame identifying value with the ideal frame identifying value;
• synchronization setting means for setting intermittent receiving timing of the receiver;
• and
• control means for controlling the synchronization setting means such that the intermittent receiving timing is determined based on the ideal frame identifying value when either the received frame synchronization signal or the received frame identifying signal is not detected and that the intermittent receiving timing is determined based on the ideal frame identifying value when the received frame identifying value is coincident with the ideal frame identifying value, and storing a next ideal frame identifying value which should be received at a next intermittent receiving timing onto the storage means, the next ideal frame identifying value being produced based on the ideal frame identifying value.

A receiver for intermittently receiving a transmission signal after synchronization establishment, the transmission signal including a frame synchronization signal and a frame identifying signal, the receiver comprising:

• storage means for storing an ideal frame identifying value which was produced at a preceding intermittent receiving timing;
• first means for detecting a received frame synchronization signal from a received transmission signal;
• second means for detecting a received frame identifying signal from the received transmission signal to produce a received frame identifying value;
• comparing means for comparing the received frame identifying value with the ideal frame identifying value;
• first synchronization Betting means for setting the intermittent receiving timing;
• second synchronization setting means for setting the intermittent receiving timing;
• and
• control means determining intermittent receiving timing based on the ideal frame identifying value when either the received frame synchronization signal or the received frame identifying signal is not detected, determining intermittent receiving timing based on the ideal frame identifying value when the received frame identifying value is coincident with the ideal frame identifying value storing a next ideal frame identifying value which should be received at a next intermittent receiving timing, the next ideal frame identifying value being produced based on the ideal frame identifying value,. determining whether a predicated frame identifying value which was predicted at the preceding intermittent receiving timing is stored when the received frame identifying value is&not coincident with the ideal frame identifying value, comparing the received frame identifying value with the predicated frame identifying value when the predicated frame identifying value is stored, determining intermittent receiving timing based on the received frame identifying value when the received frame identifying value is coincident with the predicted frame identifying value, determining intermittent receiving timing based on both the ideal frame identifying value and the received frame identifying value when the received frame identifying value is not coincident with the predicted frame identifying value, storing a next predicted frame identifying value which should be received at the next intermittent receiving timing, the next predicted frame identifying value being predicted based on the received frame identifying value when the received frame identifying value is not coincident with the predicted frame identifying value, and storing a next ideal frame identifying value which should be received at the next intermittent receiving timing, the next ideal frame identifying value being produced based on the ideal frame identifying value when the received frame identifying value is not coincident with the predicted frame identifying value.