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US 7,096,016 B2Granted
High-speed all-band-cell search cellular phone
AssigneeNEC Corporation
InventorOsamu Hasegawa
Life of this patent
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Abstract
A cellular phone includes a RSSI measurement circuit for measuring power levels of received baseband signal at divided band portions of the whole band, a band sorting circuit sorting the divided band portions based on the descending order of the power levels, and a cell search circuit searching the carriers of each divided band portion in the order of the results of the sorting, to thereby determine a tentative waiting cell.
Claims21
A cellular phone comprising:
- a first search section for measuring a profile of power distribution of a whole band of the cellular phone to select a band portion from said whole band based on said profile of power distribution, said band portion including therein a plurality of carriers;
- and
- a second search section for performing an ordinary cell search for the carriers of said band portion to determine a tentative waiting cell, wherein,
- the first search section measures the profile of the power distribution of the whole band by measuring individual power levels within frequency overlapping divided bands portions that, in total, define the whole band, and
- said ordinary cell search includes slot identification, frame timing and PSC group identification, PSC identification, and RSCP measurement as prescribed in 3GPP:Ts25.124 Annex C.
2 more elements
A method for determining a waiting cell in a cellular phone comprising the steps of:
- in a 3GPP system, measuring a profile of power distribution of a whole band of the cellular phone, by measuring power levels of divided band portions of the whole band using a center frequency of each divided band portion, to select a band portion from said whole band based on said profile of power distribution, said band portion including therein a plurality of carriers;
- and
- searching a tentative waiting cell by using an ordinary cell search for the carriers of said selected band portion.
A cellular phone, comprising:
- an antenna (16);
- a receiver (11) connected to receive a radio frequency signal through the antenna;
- and
- a band-cell detection block (10) connected to an output of the receiver and connected to control the receiver,
- the band-cell detection block comprising
- a band sorting circuit (13),
- a RSSI measurement circuit (12) connected to the receiver output, the RSSI measurement circuit i) measuring a RSSI level of the received signal at divided bands of the whole band of the signal and ii) delivering the measured RSSI levels of the divided bands to the band sorting circuit,
- a cell search circuit (14) connected to the receiver output and connected to an output of the band sorting circuit, and
- a band cell determination circuit (15), wherein,
- the band sorting circuit sorts the divided bands based on the RSSI levels received from the RSSI measurement circuit and selects one or more of the divided bands for delivery, together with frequency information of the selected divided band, to the receiver and to the cell search circuit,
- the cell search circuit performs an ordinary cell search for carriers of the selected divided band to determine a tentative waiting cell, and
- said ordinary cell search includes slot identification, frame timing and PSC group identification, PSC identification, and RSCP measurement as prescribed in 3GPP:Ts25.124 Annex C.
9 more elements
Dependencies are inferred from the claim text.