Method and apparatus to maintain network coverage when using a transport media to communicate with a remote antenna
First Claim
1. A method for use in a cellular communications system having a centralized radio processing portion in communication with a plurality of remote air interface radio portions over a transport medium, the method comprising:
- in the centralized radio processing portion, compensating for a fixed delay associated with the transport medium coupling the centralized radio processing portion and one of the remote air interface radio portions in evaluating a time period corresponding to a variable delay between transmission by a mobile station and receipt of the transmission by the centralized radio processing portion, the mobile station communicating with the one of air interface radio portions, the communication being received by the centralized radio processing portion from the one of the remote air interface radio portions; and
providing to the mobile station a timing adjust value independent of the fixed delay;
wherein the timing adjustment value is used to avoid overlap in time slots with another mobile station.
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Abstract
In a cellular communications system having a centralized radio processing portion (a base station hotel) in communication with a plurality of remote air interface radio portions (or radio heads) over a transport medium, the centralized radio processing portion compensates for a fixed delay associated with the transport medium coupling the centralized radio processing portion and one of the remote air interface radio portions when evaluating a time period corresponding to a variable delay between transmission by a mobile in communication with the one of air interface radio portions and receipt of the transmission by the centralized radio processing portion. The variable delay may relate to time out periods or time slot synchronization.
30 Citations
21 Claims
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1. A method for use in a cellular communications system having a centralized radio processing portion in communication with a plurality of remote air interface radio portions over a transport medium, the method comprising:
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in the centralized radio processing portion, compensating for a fixed delay associated with the transport medium coupling the centralized radio processing portion and one of the remote air interface radio portions in evaluating a time period corresponding to a variable delay between transmission by a mobile station and receipt of the transmission by the centralized radio processing portion, the mobile station communicating with the one of air interface radio portions, the communication being received by the centralized radio processing portion from the one of the remote air interface radio portions; and providing to the mobile station a timing adjust value independent of the fixed delay;
wherein the timing adjustment value is used to avoid overlap in time slots with another mobile station. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. A method for use in a cellular communications system having a centralized radio processing portion in communication with a plurality of remote air interface radio portions over a transport medium, the method comprising:
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in the centralized radio processing portion, compensating for a fixed delay associated with the transport medium coupling the centralized radio processing portion and one of the remote air interface radio portions in evaluating a time period corresponding to a variable delay between transmission by a mobile station and receipt of the transmission by the centralized radio processing portion, the mobile station communicating with the one of air interface radio portions, the communication being received by the centralized radio processing portion from the one of the remote air interface radio portions; and wherein the evaluating is determining a time out period associated with the transmission from the mobile station to determine if the transmission was received within the time out period.
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9. A cellular communication system comprising:
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a host processing part coupled to receive a communication over a transport medium from a remote air interface part, the host processing part determining a time interval between transmission by a mobile station in communication with the remote air interface part and receipt of the transmission at the host processing part, the host processing part compensating for a fixed delay associated with the transport medium coupling the host processing part and the remote radio interface part in evaluating the time interval; and wherein the evaluating determines if the transmission from the mobile station was received within an allowable timeout period. - View Dependent Claims (10, 11, 12, 13, 14, 16, 17, 18, 19, 20)
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15. A cellular communication system comprising:
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a host processing part coupled to receive a communication over a transport medium from a remote air interface part, the host processing part determining a time interval between transmission by a mobile station in communication with the remote air interface part and receipt of the transmission at the host processing part, the host processing part compensating for a fixed delay associated with the transport medium coupling the host processing part and the remote radio interface part in evaluating the time interval; and wherein the time interval corresponds to a timing advance time period summed with the fixed delay, the timing advance period being used to avoid overlap in time slots with another mobile station.
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21. A cellular communication system comprising:
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a host processing part coupled to receive a communication from a mobile station via a transport medium; and means for compensating for a fixed delay associated with a transport medium coupling the host processing part and a remote radio interface part when evaluating a timing period associated with a transmission from the mobile station in communication with the remote radio interface part; and wherein the timing period is one of a time out period associated with dropping a call if the transmission is not received within the time out period and an adjustable timing advance provided to the mobile station independent of the fixed delay that is used to avoid overlap in time slots with another mobile station.
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Specification