Method for changing BCCH carrier frequency without disturbing ongoing call traffic
First Claim
1. A method for establishing a new BCCH carrier frequency within a cell comprising the steps of:
- establishing a second BCCH carrier frequency within a cell having a first BCCH carrier frequency;
transmitting a BCCH data on the first BCCH carrier frequency during a first time period;
transmitting the BCCH data on the first and the second BCCH carrier frequencies during a second time period; and
discontinuing transmission of the BCCH data on the first BCCH carrier frequency in a time delayed manner during a third time period such that the BCCH data is only transmitted on the second BCCH carrier frequency after the third time period.
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Accused Products
Abstract
A method for establishing a new broadcast control channel carrier frequency within a cell without disturbing ongoing call traffic is disclosed. A cell having a base station transmitting broadcast control channel data over an existing BCCH carrier frequency establishes a second BCCH carrier frequency within the cell. During a first time period BCCH data is transmitted on the existing first BCCH carrier frequency. During a second time period, both the existing and new BCCH carrier frequencies carry BCCH data to enable surrounding mobile stations to detect and recognize both carriers. The transmission of the old BCCH carrier frequency is then discontinued during a third time period, such that the broadcast control channel data is only transmitted on the new BCCH carrier frequency.
33 Citations
16 Claims
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1. A method for establishing a new BCCH carrier frequency within a cell comprising the steps of:
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establishing a second BCCH carrier frequency within a cell having a first BCCH carrier frequency; transmitting a BCCH data on the first BCCH carrier frequency during a first time period; transmitting the BCCH data on the first and the second BCCH carrier frequencies during a second time period; and discontinuing transmission of the BCCH data on the first BCCH carrier frequency in a time delayed manner during a third time period such that the BCCH data is only transmitted on the second BCCH carrier frequency after the third time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for establishing a new BCCH channel carrier frequency within a cell without disturbing ongoing call traffic, comprising the steps of:
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establishing a second BCCH carrier frequency within a cell having a first BCCH carrier frequency; transmitting BCCH filling on the second BCCH carrier frequency during a time period wherein the first BCCH carrier frequency is still active; stopping transmission of the FCCH, BCCH, CCCH, SCH and BCCH filling on the first BCCH carrier frequency in a time delayed manner such that selected channels are deactivated at different times over a selected time period; and disabling the first BCCH carrier frequency. - View Dependent Claims (11, 12, 13)
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14. A base station serving a cell within a cellular communications network, comprising:
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a transceiver for transmitting and receiving carrier frequencies; means for controlling the transceiver to define and transmit a first and a second BCCH carrier frequency, wherein the means for controlling enables transmission of the first BCCH carrier during a first time period, transmission of both the first and the second BCCH carrier frequency during a second time period and transmission of only the second BCCH carrier frequency after a third time period, wherein the means for controlling stops transmission of data associated with the first BCCH carrier frequency in a time delayed manner. - View Dependent Claims (15, 16)
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Specification