Rake reception apparatus and method in a mobile terminal

• US 20070242641A1
• Filed: 04/13/2007
• Published: 10/18/2007
• Est. Priority Date: 04/13/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Moon, Hi-Chan, Eun, Yoo-Chang, Ryu, Dong-Ryeol
• Granted Patent: US 7,940,752 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04B 2201/70709 with discontinuous detection
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A rake reception apparatus for determining whether a paging channel is received in a mobile terminal using a Discontinuous Reception (DRX) mode. A searcher searches for a multi-path signal using a received signal output from a Radio Frequency (RF) part, and calculates an energy value for each hypothesis. A demodulator demodulates a Paging Indicator (PI) for a hypothesis for which an energy value calculated by the searcher exceeds a valid path threshold. A controller determines whether a paging channel is received, according to the demodulated signal output from the demodulator, and performs finger allocation using a multi-path search of the searcher if it is determined that the paging channel is transmitted.

Claims

1. A rake reception apparatus for determining whether a paging channel is received in a mobile terminal using a Discontinuous Reception (DRX) mode, the apparatus comprising:

a searcher for searching for a multi-path signal using a received signal output from a Radio Frequency (RF) part, and calculating an energy value for each of a plurality of hypotheses;

a demodulator for demodulating a Paging Indicator (PI) for a hypothesis for which an energy value calculated by the searcher exceeds a valid path threshold; and

a controller for determining whether a paging channel is received, according to the demodulated signal output from the demodulator, and performing finger allocation using a multi-path search of the searcher if it is determined that the paging channel is transmitted.

2. The rake reception apparatus of claim 1, wherein the demodulator demodulates a PI, for a hypothesis for which an energy value for each of the hypotheses, detected as several upper values by the searcher, exceeds a valid path threshold.

3. The rake reception apparatus of claim 1, wherein the demodulator demodulates a PI for each path while searching for the multi-path signal.

4. The rake reception apparatus of claim 1, wherein the demodulator further comprises:

a channelization code generator for generating a channelization code;

a multiplier for multiplying an interval in which a PI is located, by the channelization code output from the channelization code generator, for every hypothesis being checked by the searcher;

a PI accumulator for receiving PI information in a correlation interval of each hypothesis being checked by the searcher, and accumulating a signal in a PI interval;

a channel compensator for performing channel compensation by multiplying the value accumulated for each hypothesis in the searcher by the accumulated PI value output from the PI accumulator;

a decider for determining, as a valid path, a hypothesis for which an energy value for each hypothesis, calculated by the searcher, exceeds a valid path threshold; and

a PI combiner for determining whether combination is possible depending on the validity determination of the decider, and performing combination on a hypothesis having an energy value exceeding a threshold, if combination is possible.

5. The rake reception apparatus of claim 4, wherein the decider determines, as a valid path, a hypothesis for which an energy value for each hypothesis, detected as several upper values by the searcher, exceeds a valid path threshold.

6. The rake reception apparatus of claim 1, wherein the controller transitions to a sleep state if it is determined that the paging channel is not transmitted.

7. The rake reception apparatus of claim 1, wherein the controller performs finger allocation and PI demodulation operations after the RF part of the terminal is powered off.

8. A rake reception method for determining whether a paging channel is received in a mobile terminal using a Discontinuous Reception (DRX) mode, the method comprising:

searching for a multi-path signal using a received signal output from a Radio Frequency (RF) part, and calculating an energy value for each of a plurality of hypotheses;

determining, as a valid path, a hypothesis for which an energy value calculated for each hypothesis exceeds a valid path threshold, and demodulating a Paging Indicator (PI) for a hypothesis for which the energy value exceeds a threshold if it is determined that combination is possible; and

determining whether a paging channel is received, according to the demodulated signal, and performing finger allocation using a multi-path search result if it is determined that the paging channel is transmitted.

9. The rake reception method of claim 8, wherein the PI demodulation is performed while the multi-path signal is searched.

10. The rake reception method of claim 8, further comprising:

determining, as a valid path, a hypothesis for which the energy value for each hypothesis, detected as several upper values, exceeds a valid path threshold; and

determining whether combination is possible depending on the determination of the valid path, and demodulating a PI for a hypothesis having an energy value exceeding a threshold, if combination is possible.