Establishment of a connection between a base station and a mobile station using random access channels

Abstract

A connection establishment method for establishing a random access type connection using a random access channel, which is used in a radio system having several subscriber terminal equipments (37 to 38) and base stations (33 to 36) where one or more transceiver units (40 to 47) operate, and in which system connection establishment between one of the subscriber terminal equipments (37 to 38) and the base station (33 to 36) is possible when the one subscriber terminal equip nt (37 to 38) is situated in the coverage area of one or more transceiver units (40 to 47) of the base station, where the one subscriber terminal equipment (3 to 38) evaluates the quality of the connections to be established. Starting from a condition in which no connection is established with the one subscriber terminal equipment, the one subscriber terminal equipment (37 to 38) forms a random access type connection to more than one base station transceiver unit (40 to 47) included in one or more base stations (33 to 38).m

Description

[0001]This application is the national phase of international application PCT / F197 / 00064, filed Feb. 4, 1997 which designated the U.S.FIELD OF THE INVENTION[0002]The invention relates to a connection establishment method comprising a random access type connection establishment using a random access channel, which is used in a radio system comprising several subscriber terminal equipments and base stations where one or more transceiver units operate, and in which system the connection establishment between the subscriber terminal equipment and the base station is possible when the subscriber terminal equipment is situated in the coverage area of one or more transceiver units of the base station, in which area the subscriber terminal equipment evaluates the quality of the connections to be established.[0003]The invention further relates to a subscriber terminal equipment which is arranged to establish a random access type connection by using a random access channel in a radio system c...

AI Technical Summary

Benefits of technology

[0010]The object of the present invention is to accomplish a solution which will diminish interferences relating especially to the initial stage of the connection and enable the use of macrodiversity also for a packet-mode connection.

[0014]Considerable advantages are attained with the solution of the invention. By using the method of the invention, macrodiversity state will be assumed from the beginning of connection establishment. In that case the updating of the active group is required less and at the beginning of the connection, a lower transmission power can be used than in prior art solutions. In this way the need for signaling will be reduced and the capacity of the system will increase.

Problems solved by technology

Furthermore, during a packet-mode transmission it is difficult to carry out soft handover the middle of the packet although the quality of the connection during the transmission would change to be favourable for handover.

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