Method for estimating the downlink capacity in a spread spectrum wireless communications system
First Claim
1. A method of determining capacity in a wireless network in which plural signals are transmitted on a shared downlink channel to plural mobiles within a coverage area of the network, the method comprising:
- a) transmitting, from a first base station, a real signal on the downlink channel to a test mobile as it is moved on a test route within the network'"'"'s coverage area;
b) determining a mean and a variance of the real signal as it is being transmitted on the downlink channel while the test mobile moves on the test route;
c) transmitting, from the first base station, an aggregate of a plurality of first test signals on the downlink channel, each of the plurality of first test signals corresponding to simulated transmission from the first base station to each of a first plurality of mobiles, each first test signal being a sample of a stochastic process that is calibrated to the determined mean and the determined variance of the real signal so that the plurality of first test signals is statistically equivalent to signals transmitted to live mobiles;
d) transmitting, from at least one second base station, an aggregate of a plurality of second test signals on the downlink channel, each of the plurality of second test signals corresponding to simulated transmission from the second base station to each of a second plurality of mobiles, each second test signal being a sample of a stochastic process that is calibrated to the determined mean and the determined variance of the real signal so that the plurality of first test signals is statistically equivalent to signals transmitted to live mobiles;
e) determining whether or not an acceptable performance is indicated by at least one predetermined measurable performance characteristic when the real signal and the first and second pluralities of test signals are being transmitted as the test mobile is being moved on the test route; and
f) if acceptable performance is determined, determining that the downlink channel has the capacity of handling downlink traffic corresponding to at least the first and second pluralities of mobiles.
12 Assignments
0 Petitions
Accused Products
Abstract
The per sector or per cell downlink capacity in a spread spectrum wireless network is determined using a single test mobile that is operating within a background of simulated co-channel interference being broadcast in each sector by all cell sites in the network whose capacity is of interest. From all sectors, an Orthogonal Channel Noise Simulator (OCNS) generates a multiple number of calibrated test signals, which are aggregated and broadcast downlink, where each transmitted test signal simulates the downlink power transmitted to a live mobile. Each component test signal in the aggregated OCNS output transmitted in each sector is a sample of a stochastic process with a set mean and standard deviation that are determined from the mean and standard deviation of the power of a real signal transmitted downlink to the test mobile as it is moved around the network'"'"'s coverage area. The capacity of the sector is determined by increasing the number of test signals in each aggregated OCNS output until measurable performance is compromised.
28 Citations
7 Claims
-
1. A method of determining capacity in a wireless network in which plural signals are transmitted on a shared downlink channel to plural mobiles within a coverage area of the network, the method comprising:
-
a) transmitting, from a first base station, a real signal on the downlink channel to a test mobile as it is moved on a test route within the network'"'"'s coverage area; b) determining a mean and a variance of the real signal as it is being transmitted on the downlink channel while the test mobile moves on the test route; c) transmitting, from the first base station, an aggregate of a plurality of first test signals on the downlink channel, each of the plurality of first test signals corresponding to simulated transmission from the first base station to each of a first plurality of mobiles, each first test signal being a sample of a stochastic process that is calibrated to the determined mean and the determined variance of the real signal so that the plurality of first test signals is statistically equivalent to signals transmitted to live mobiles; d) transmitting, from at least one second base station, an aggregate of a plurality of second test signals on the downlink channel, each of the plurality of second test signals corresponding to simulated transmission from the second base station to each of a second plurality of mobiles, each second test signal being a sample of a stochastic process that is calibrated to the determined mean and the determined variance of the real signal so that the plurality of first test signals is statistically equivalent to signals transmitted to live mobiles; e) determining whether or not an acceptable performance is indicated by at least one predetermined measurable performance characteristic when the real signal and the first and second pluralities of test signals are being transmitted as the test mobile is being moved on the test route; and f) if acceptable performance is determined, determining that the downlink channel has the capacity of handling downlink traffic corresponding to at least the first and second pluralities of mobiles. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification