Quick paging in telecommunication systems
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsRajaram Ramesh, Havish Koorapaty, Kumar Balachandran
Life of this patent
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Abstract
In an orthogonal frequency division multiple access communication system, unused frequency resources during a conventional preamble signal are used for a quick paging mechanism. A set of quick paging signals is sent over the unused frequency resources to signal one or more subscriber stations.
Claims25
A method of quick paging in a communication system using a plurality of subcarriers for orthogonal frequency division multiple access, wherein a preamble signal comprises one or more preamble sequences, at least one predetermined preamble sequence being successively transmitted on a predetermined first set of the subcarriers, the method comprising:
- receiving, at a base station, a request to page one or more subscriber stations believed to be in a paging area that includes the base station;
- identifying, by the base station, at least one quick paging code word that corresponds to the one or more subscriber stations;
- transmitting the at least one quick paging code word on a second set of subcarriers;
- wherein the second set includes only subcarriers that were not previously used in the preamble signal, and the quick paging code word and the at least one predetermined preamble sequence are transmitted simultaneously in the preamble signal.
A method in a subscriber station of quick paging in a communication system using a plurality of subcarriers for orthogonal frequency division multiple access, the method comprising:
- receiving, at a subscriber station, quick paging setup information from a base station, wherein the quick paging setup information informs the subscriber station of one or more paging code words to listen for;
- receiving a predetermined preamble signal that can include at least one predetermined quick paging code word carried by a second set of subcarriers, wherein the second set of subcarriers is different from a first set of subcarriers that carry the predetermined preamble sequence;
- and
- determining whether a respective quick paging code word is present in the received preamble signal.
A transmitter for sending quick paging signals in a communication system using a plurality of subcarriers for orthogonal frequency division multiple access, wherein a preamble signal comprises one or more preamble sequences, at least one predetermined preamble sequence being successively sent on a predetermined first set of the subcarriers, the transmitter comprising:
- a memory configured to store associations between quick paging code words and receivers in the communication system;
- a control processor configured to exchange information with the memory;
- and
- a quick paging code word generator configured to use information from the control processor to generate selected quick paging code words to be sent to an associated receiver on a second set of subcarriers;
- wherein the second set includes only subcarriers that were not previously used in the preamble signal, and the quick paging code word and the preamble sequence are sent simultaneously in the preamble signal.
A receiver for receiving quick paging signals in a communication system using a plurality of subcarriers for orthogonal frequency division multiple (OFDM) access, wherein a preamble signal comprises one or more preamble sequences, at least one predetermined preamble sequence being successively sent on a predetermined first set of the subcarriers, comprising:
- an OFDM demodulator;
- a channel estimator in communication with the OFDM demodulator;
- a quick paging signal detector in communication with the OFDM demodulator and the channel estimator;
- and
- a controller configured to control the OFDM modulator, channel estimator, and quick paging signal detector;
- wherein the quick paging signal detector detects presence in a received preamble signal of a quick paging code word associated with the receiver on a second set of the plurality of subcarriers;
- wherein the second set includes only subcarriers that were not previously used in the preamble signal;
- and
- wherein the quick paging code word and the preamble sequence are sent simultaneously in the preamble signal.
Dependencies are inferred from the claim text.