Mobile Terminal, Base Station and Methods Therein

A method in a mobile terminal for requesting access to a wireless communication system, the method comprising:

• receiving broadcasted system information directly indicating first access request preambles for a first contention based channel, and indirectly indicating second access request preambles for a second contention based channel based on the directly indicated first access request preambles, wherein the received broadcasted system information further indicates a second available resource of the second contention based channel relative to a first available resource of the second contention based channel;
• deriving the second access request preambles from the first access request preambles and the second available resource;
• and
• requesting access to the wireless communication system using the second access request preambles or the first access request preambles, and the second or the first available resource to access the second contention based channel or the first contention based channel, respectively, of the wireless communication system.

A base station for managing access to a first contention based channel and a second contention based channel, the base station comprising:

• a processing circuit configured to:
• encode system information that directly indicates first access request preambles for the first contention based channel, and indirectly indicates second access request preambles for the second contention based channel based on the directly indicated first access request preambles;
• and
• encode system information that indicates a second available resource of the second contention based channel relative to a first available resource of the second contention based channel;
• and
• a transmitter circuit configured to broadcast the encoded system information to mobile terminals.

A mobile terminal for requesting access to a wireless communication system, the mobile terminal comprising:

• a receiver circuit configured to receive broadcasted system information directly indicating first access request preambles for a first contention based channel, and indirectly indicating second access request preambles for a second contention based channel based on the directly indicated first access request preambles, wherein the received broadcasted system information further indicates a second available resource of the second contention based channel relative to a first available resource of the second contention based channel;
• and
• a processing circuit configured to:
• derive the second access request preambles from the first access request preambles and the second available resource;
• and
• request access to the wireless communication system using the second access request preambles or the first access request preambles, and the second or the first available resource to access the second contention based channel or the first contention based channel,
• respectively, of the wireless communication system.