Method for transmitting broadcast information in a digital control channel
First Claim
Patent Images
1. A method for transmitting at a transmitter and receiving at a receiver information which changes from time to time and which is transmitted at regular intervals comprising the steps of:
- transmitting along with each transmission of said information from said transmitter an indication of whether said information has changed, said indication being set to any one of first, second and third values, said first value indicating that said information has not changed and should not be read, said second value indicating that said information has changed and should be read, and said third value being transmitted a predetermined number of times after said second value is transmitted to indicate that said information should be read only if it has not been read since said second value was transmitted; and
reading said information at said receiver as indicated by said values.
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Abstract
The present invention provides a method for transmitting information on a communications channel, e.g. , a digital control channel between a base station and a mobile station in a cellular system. The method includes the steps of grouping the information into a plurality of information elements, providing at least one change flag to indicate whether the value of at least one of the information elements has changed and transmitting the change flag and the information element over the communications channel.
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Citations
55 Claims
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1. A method for transmitting at a transmitter and receiving at a receiver information which changes from time to time and which is transmitted at regular intervals comprising the steps of:
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transmitting along with each transmission of said information from said transmitter an indication of whether said information has changed, said indication being set to any one of first, second and third values, said first value indicating that said information has not changed and should not be read, said second value indicating that said information has changed and should be read, and said third value being transmitted a predetermined number of times after said second value is transmitted to indicate that said information should be read only if it has not been read since said second value was transmitted; and reading said information at said receiver as indicated by said values. - View Dependent Claims (2, 3)
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4. A method for communicating information over a digital control channel (DCC) divided into a plurality of channels including a broadcast control channel (BCCH) and a paging channel (PCH) comprising the steps of:
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dividing said BCCH into a plurality of subchannels for transmitting different portions of said information; transmitting at least one portion of said information in at least one of said BCCH subchannels; transmitting at least one change flag in at least one of said PCH and said BCCH subchannels to indicate when said at least one information portion changes; receiving said at least one change flag; and reading said at least one information portion in response to an indication in said at least one change flag. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for receiving at a mobile station overhead information comprised of a plurality of overhead information elements transmitted during predetermined time intervals, each of said information elements being associated with a change of value indication also transmitted to said mobile station, comprising the steps of:
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reading the overhead information elements contained in at least the first interval; reading an element of the overhead information contained in at least one interval subsequent to said at least first interval in response to the receipt of an indication that the value of said overhead information element has changed; and placing said mobile station in a sleep mode during at least a portion of the time when said mobile station is not reading said overhead information elements. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. In a radio communications system operating on a digital control channel (DCC) which is divided into a plurality of time slots, said time slots being grouped into a series of superframes, a method for transmitting a plurality of information elements having changeable values over said DCC comprising the steps of:
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dividing said information elements into a plurality of groups each including at least one information element; assigning to each of said groups a change flag indicating whether the value of any of its constituent information elements has changed; and transmitting said groups and said assigned change flags in at least one of said time slots in said superframes. - View Dependent Claims (27, 28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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29. A method of transmitting a plurality of messages over a digital control channel (DCC) comprising the steps of:
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dividing the DCC into a plurality of channels including a broadcast control channel (BCCH) and a paging channel (PCH); grouping the messages into the first and second categories, said first category comprising messages to be transmitted at a first rate over the BCCH and said second category comprising messages to be transmitted at a second rate over the BCCH; and dividing the BCCH into first and second subchannels, said first subchannel being used for transmitting messages in said first category at said first rate and said second subchannel being used for transmitting messages in said second category at said second rate.
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40. In a radio communications system using a digital control channel (DCC) comprised of a broadcast control channel (BCCH) for transmitting broadcast information and a paging channel (PCH) for transmitting paging information, a method for transmitting the broadcast information over the BCCH comprising the steps of:
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dividing the BCCH into a plurality of subchannels for transmitting a plurality of different types of broadcast information; and transmitting in the PCH at least one flag which indicates whether there is a change in at least a portion of the broadcast information transmitted in one of the BCCH subchannels. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47)
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48. A method for transmitting changeable information in a broadcast control channel (BCCH) comprising the steps of:
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dividing the BCCH into a plurality of subchannels including first and second subchannels; transmitting a first portion of the information in said first subchannel and a second portion of the information in said second subchannel; and transmitting in said first subchannel an indication of whether said second portion of information has changed. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55)
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Specification