Patent ID: 6289217
Filing Date: 2001-09-11
Classification: H04L,H04W

Abstract:
A method for adapting a radio connection to a changing environment in a cellular radio system comprising a base station and a multitude of mobile stations, both the base station and the mobile stations being capable of functioning as transmitting devices and as receiving devices, said method comprising the steps of:arranging the radio traffic between the base station and the mobile stations on a multiple access principle according to a given frame structure,for a given connection between a transmitting device and a receiving device reserving a given data transmission capacity in said frame structure,during said given radio connection, using the receiving device to measure the connection quality, andas a response to a situation where the measured connection quality differs in a predefined way from a certain predetermined target level of connection quality, changing the size of data transmission capacity reserved for said radio connection in said frame structure;wherein for measuring the connection quality the receiving device forms a value describing said radio connection and compares said value to a given threshold value, in which casea1) if said value describing the connection quality is lower than said threshold value, the size of data transmission capacity reserved in said frame for the radio connection in question is increased, anda2) if said value describing the connection quality is higher than said threshold value, there is formed an estimate of what would be the value describing the connection quality if a smaller data transmission capacity were reserved in said frame structure for said radio connection, and this estimate is compared to said threshold value, in which caseb1) if said estimate is lower than said threshold value, the measurement of the connection quality is restarted, andb2) if said estimate is higher than said threshold value, the size of data transmission capacity reserved for said radio connection in said frame structure is reduced,and wherein said threshold value is a parameter, the value of which is changeable during the operation of the cellular radio system.