Method and arrangement for satisfying performance requirements by tuning parameters for accessing a network with random access channels

摘要

A method and a communication network node for satisfying detection miss probability and false detection probability requirements in a random access channel used by mobile stations (MS) for accessing a communication network system comprising radio base stations (BS) each serving at least one cell (19). The method includes optimizing a random access channel, wherein the method performs estimating detection miss probability (P m) in said cell, tuning random access parameters such that said estimated detection miss probability satisfies predetermined requirements, estimating a false detection probability (P f) in said communication cell (19), tuning said random access parameters such that said estimated false detection probability satisfies predetermined requirements, and tuning said random access parameters such that an extensive interference caused by mobile stations attempting random access in said communication cell is avoided.

主权项

1. A method for satisfying random access attempt success requirements of a random access channel (RACH) used by a mobile station (MS) for accessing a communication network accessible in a communication cell served by a radio base station (BS), said mobile station (MS) communicating on uplink and downlink channels, the method comprising the steps of:
gathering data during a time period, the data including a number of preamble transmission attempts to the base station made by the mobile station in order to perform a successfully executed random access to the base station, estimating quantities, including a false detection probability, related to random access attempt success statistics in said cell based on the gathered data, tuning random access parameters such that said estimated quantities related to random access attempt success statistics satisfy predetermined random access attempt success requirements, and using said false detection probability and requirements on a maximum false detection probability to compute a detection threshold.