Mobile equipment based filtering for packet radio service
11 Assignments
0 Petitions
Accused Products
Abstract
A method for operating a mobile equipment (ME 10) in a wireless network (12), the method having steps of (A) determining a parameter that is indicative of a signal quality experienced by the ME, such as by determining a speed of the ME; (B) calculating in the ME an indication of link quality, the calculation employing a filtering operation having a filter length that is a function of the determined parameter, such as speed or derivative of the speed of the ME; and (C) reporting the calculated indication of link quality to the wireless network. The step of determining includes steps of (a) deriving an indication of ME speed in the wireless network; and (b) transmitting the speed indication to the ME using a point-to-point message. In a preferred embodiment the step of transmitting places the ME speed indication in padding bits of the point-to-point message, such as one sent on a Packet Associated Control Channel (PACCH). In a most preferred embodiment the step of transmitting uses a plurality of bits placed into padding bits of a Packet System Identification 13 (PSI13) message sent on the Packet Associated Control Channel (PACCH). The plurality of bits (e.g., four bits) are used to encode a plurality of speed subranges (e.g., 16 subranges) of a predetermined ME speed range (e.g., 0 km/hr to 250 km/hr). The indication of ME speed is used to one of modify or replace a forgetting factor “a” that is calculated using a parameter received in a broadcast message from the wireless network. The forgetting factor influences the length a running average filter that operates on link quality measurement data, such as a mean Bit Error Probability (BEP) or a coefficient of variation of the BEP.
37 Citations
40 Claims
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1-20. -20. (canceled)
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21. A method comprising:
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wirelessly receiving, at a mobile equipment and from a network, an indication of signal quality experienced by the mobile equipment;
setting a finite length of a filter as a function of the received indication of signal quality;
filtering a sequence of link quality measurement data using the finite length filter; and
transmitting an indication of the filtered link quality measurement data to the network. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A mobile equipment comprising:
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a receiver adapted to wirelessly receive from a network an indication of signal quality experienced by the mobile equipment;
a processor, coupled to the receiver, adapted to implement a filter for filtering a sequence of link quality measurement data, said filter having a finite filter length that is a function of said received indication of signal quality; and
a transmitter, coupled to the processor, adapted to transmit an indication of the filtered link quality measurement data to the network. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A computer program embodied on a memory and executable by a controller of a mobile equipment for executing measurement data filtering operations, the operations comprising:
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setting a finite length of a filter as a function of an indication of signal quality experienced by the mobile equipment, said indication of signal quality received in a wireless message;
filtering a sequence of link quality measurement data using the finite length filter; and
transmitting an indication of the filtered link quality measurement data to the network. - View Dependent Claims (38, 39, 40)
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Specification