Selective call receiver with battery saving features and method therefor

Claim 3

The method of claim 1 wherein the step of performing the baud rate detection includes the step of accessing, by a processor, a codeplug storing a plurality of predetermined selective call signal parameters for the selective call receiver.

Claim 4

The method of claim 2 wherein the plurality of predetermined selective call signal parameters includes a predetermined baud rate for the selective call signal.

Claim 5

The method of claim 3 wherein the plurality of predetermined selective call signal parameters further includes information identifying a plurality of assigned data frames allocated to the selective call receiver.

Claim 6

The method of claim 1 wherein the step of determining includes the step of determining to activate the receiver circuit during a next expected synchronization codeword when the receiver circuit was not activated during a synchronization codeword in the subsequent one of the plurality of data batches and the baud rate is not detected in the at least one of the plurality of assigned data frames.

Claim 7

The method of claim 5 further including the step of switching operation to an asynchronous battery saving mode when the next expected synchronization codeword is not found.

Claim 8

The method of claim 5 further including the step of continuing operation in a synchronous battery saving mode when the next expected synchronization codeword is found.

Claim 9

The method of claim 1 wherein the step of determining includes the step of determining to switch operation to an asynchronous battery savings mode when the receiver circuit was activated during a synchronization codeword in the subsequent one of the plurality of data batches and the baud rate is not detected in the at least one of the plurality of assigned data frames.

Claim 10

The method of claim 1 further comprising the steps of: determining whether a POCSAG preamble is detected in response to the baud rate being detected in the at least one of the plurality of assigned data frames; and activating the receiver circuit to monitor for a new synchronization codeword in response to the POCSAG preamble being detected.

Claim 13

The method of claim 10 further including the step of accessing a memory device storing a plurality of predetermined selective call signal parameters including the predetermined baud rate and information identifying the plurality of assigned data frames.

Claim 14

The method of claim 10 wherein the step of activating the receiver circuit comprises the step of activating the receiver circuit for a next expected synchronization codeword after the synchronization codeword in the subsequent one of the plurality of data batches in response to the receiver circuit being activated during the synchronization codeword in the subsequent one of the plurality of data batches and the predetermined baud rate being not detected.

Claim 15

The method of claim 12 further including the step of continuing operation in a synchronous battery saving mode in response to the next expected synchronization codeword being detected.

Claim 16

The method of claim 12 further including the step of switching operation to an asynchronous battery saving mode in response to the next expected synchronization codeword not being detected.

Claim 17

A selective call receiver for receiving a selective call signal at a predetermined baud rate, wherein the selective call signal includes a preamble and a plurality of data batches, and wherein each of the plurality of data batches includes a synchronization codeword and at least one assigned data frame, the selective call receiver comprising: a receiver circuit for receiving and demodulating the selective call signal; a baud rate detector coupled to the receiver circuit for detecting the predetermined baud rate of the selective call signal; a synchronization codeword detector coupled to the receiver circuit for detecting synchronization codewords within the plurality of data batches; and a processor coupled to the receiver circuit and the baud rate detector for inactivating the receiver circuit and the synchronization codeword detector during reception of a synchronization codeword in one of the plurality of data batches in response to detecting the predetermined baud rate in the at least one assigned data frame of an immediately preceding one of the plurality of data batches and for activating the receiver circuit and the synchronization codeword detector during reception of a synchronization codeword in one of the plurality of data batches in response to not detecting the predetermined baud rate in the at least one assigned data frame of an immediately preceding one of the plurality of data batches.

Claim 18

A selective call receiver for receiving a selective call signal at a predetermined baud rate, wherein the selective call signal includes a preamble and a plurality of data batches, and wherein each of the plurality of data batches includes a synchronization codeword and at least one assigned data frame, the selective call receiver comprising: a receiver circuit for receiving and demodulating the selective call signal; a baud rate detector coupled to the receiver circuit for detecting the predetermined baud rate of the selective call signal; a synchronization codeword detector coupled to the receiver circuit for detecting synchronization codewords within the plurality of data batches; and a processor coupled to the receiver circuit and the baud rate detector for inactivating the receiver circuit and the synchronization codeword detector during reception of a synchronization codeword in one of the plurality of data batches in response to detecting the predetermined baud rate in the at least one assigned data frame of an immediately preceding one of the plurality of data batches and for activating the receiver circuit and the synchronization codeword detector during reception of a synchronization codeword in one of the plurality of data batches in response to not detecting the predetermined baud rate in the at least one assigned data frame of an immediately preceding one of the plurality of data batches.

Claim 19

The selective call receiver of claim 15 further comprising a preamble detector coupled to the receiver circuit for detecting the preamble, wherein the processor activates the preamble detector in response to detecting the predetermined baud rate in the at least one assigned data frame.