Random access in a mobile telecommunications system

US6643275B1 · kind B1 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Maria Gustafsson · Stockholm, SE
• Henrik Olofsson · Stockholm, SE
• Fredrik Ovesjö · Stuvsta-Snättringe, SE
• Georg Frank · Nürnberg, DE
• Wolfgang Granzow · Heroldsberg, DE

Key dates

• Filing date: May 15, 1998
• Grant date: Nov 4, 2003
• Expiry date: May 15, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W74/0866
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An uplink common physical channel (random access channel) frame structure with a separate preamble and data portion. The preamble is used by a base station to detect that a mobile station is attempting a random access request. The data portion of the channel includes user data, and pilot symbols that provide energy for channel estimation during reception of the data portion. A guard interval is preferably inserted between the preamble and data portion of the frame, which enables data detection to occur during an idle period. As such, the frame structures for both the common physical (random access) uplink channel and dedicated physical (traffic) uplink channel are compatible.