Responding to changes in measurement of system load in spread spectrum communication systems
First Claim
1. A method for responding to changes in measurement of a system load in a spread spectrum communication system, the method comprising:
- receiving over a plurality of sampling time periods a first value indicative of received signal strength for said system load within a coverage area;
determining a duration for a fluctuation in the system load across at least two time periods of said plurality of sampling time periods; and
selectively providing a second value different than said first value indicative of received signal strength based on said duration to control the system load.
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Abstract
The present invention provides a method and an apparatus for responding to changes in measurement of a system load in a spread spectrum communication system. Using a load control algorithm, for example, the spread spectrum communication system may handle sudden changes or variations, such as spikes or steps in system load measurements for an uplink and/or a downlink between a mobile unit and an access network. The load control algorithm determines whether a sudden variation of a measured system load is generated by a source not under a power control or is caused by a variation of a spread spectrum communication system load. A load control measure may be selectively applied to adjust one or more parameters associated with the system load. That is, an increase of a first new measurement value may be limited to a given maximum increment for one sampling time period of a plurality of sampling time periods in response to a spike in the system load or a desired response to a sudden increase of the system load may be delayed by a given maximum number of measurement samples. By allowing a limited increase, the response of the spread spectrum communication system to sudden changes of a system load may be controlled such that some blocking may occur but dropping of calls may be avoided. In this manner, the load control algorithm may avoid unnecessary dropping of calls.
36 Citations
25 Claims
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1. A method for responding to changes in measurement of a system load in a spread spectrum communication system, the method comprising:
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receiving over a plurality of sampling time periods a first value indicative of received signal strength for said system load within a coverage area;
determining a duration for a fluctuation in the system load across at least two time periods of said plurality of sampling time periods; and
selectively providing a second value different than said first value indicative of received signal strength based on said duration to control the system load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A spread spectrum communication system, comprising:
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a base station associated with a wireless communication network to communicate with a mobile unit; and
a controller coupled to said base station, said controller including a memory storing instructions to receive over a plurality of sampling time periods a first value indicative of received signal strength for said system load within a coverage area, determine a duration for a fluctuation in said system load across at least two time periods of said plurality of sampling time periods, and selectively provide a second value different than said first value indicative of received signal strength based on said duration to control the system load.
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19. A spread spectrum communication system, as set forth in claim 26, wherein said spread spectrum communication system defined at least in part by a Code Division Multiple Access protocol based on the Universal Mobile Telecommunications System standard.
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20. A spread spectrum communication system, as set forth in claim 26, wherein said wireless communication network defined at least in part by the Universal Mobile Telecommunications System Terrestrial Radio Access Network standard.
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21. A radio network controller to control a wireless communication network serving a plurality of base stations capable of communicating with a mobile unit, the radio network controller comprising:
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a controller; and
a memory coupled to said controller, said memory storing a load control algorithm to receive over a plurality of sampling time periods a first value indicative of received signal strength for said system load within a coverage area, determine a duration for a fluctuation in said system load across at least two time periods of said plurality of sampling time periods, and selectively provide a second value different than said first value indicative of received signal strength based on said duration to control the system load. - View Dependent Claims (22)
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23. A base station coupled to a radio network controller in a wireless communication network capable of communicating with a mobile unit, the base station comprising:
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a controller; and
a memory coupled to said controller, said memory storing a load control algorithm to receive over a plurality of sampling time periods a first value indicative of received signal strength for said system load within a coverage area, determine a duration for a fluctuation in said system load across at least two time periods of said plurality of sampling time periods, and selectively provide a second value different than said first value indicative of received signal strength based on said duration to control the system load. - View Dependent Claims (24)
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25. An article comprising a computer readable storage medium storing instructions that, when executed cause a spread spectrum communication system to:
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receive over a plurality of sampling time periods a first value indicative of received signal strength for said system load within a coverage area to respond to changes in measurement of the system load in said spread spectrum communication system;
determine a duration for a fluctuation in the system load across at least two time periods of said plurality of sampling time periods; and
selectively provide a second value different than said first value indicative of received signal strength based on said duration to control the system load.
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Specification