method for preventing interference between a first and a second communication in a mobile telephone system.

摘要

A method for avoiding interference between two messages in a mobile telephone system which operates on the time divided multiple access system (TDMA). The first message (RA) constitutes a request for the establishment of a connection from a mobile station (M2) to a base station (B1) in the system, and the second message (HA) constitutes a request for handover access from a second mobile station (M1) to another base station (B2) in the system. These two messages may possibly be transmitted on one and the same carrier frequency and their respective radio channels (RACCH and FACCH) may be confused with one another, causing the messages to be misinterpreted by a base station (B1). According to the method, a given data field of each message is coded so that the data field (HNR) of the one message will not assume the same code combination as the data field (CA) of the other message. The method can also be applied such that the two messages (HA1, HA2) concerning handover access or two messages concerning random access request can be distinguished one from the other. IMAGE