Methods and Arrangements for Contention Resolution in a Communication System

A method, in a first Radio Base Station (RBS), for communicating radio connection establishment information using Orthogonal Frequency Division Multiplexing (OFDM) to a plurality of User Equipment (UE), the method comprising:

• broadcasting system information related to establishing a radio connection on a Broadcast Channel (BCH) using a Multicast Broadcast Single Frequency Network (MBSFN) radio transmission format to the plurality of UEs, wherein the broadcasting is performed synchronously in time with broadcasting the same system information on BCH using MBSFN radio transmission format by at least a second RBS;
• receiving a radio connection establishment request from a first UE of the plurality of UEs, wherein the radio connection establishment request is related to the broadcasted system information;
• determining, based on the radio connection establishment request, a set of Downlink (DL) demodulation reference signals associated with a DL control channel;
• transmitting a radio connection establishment response to the first UE, the response comprising the set of DL demodulation reference signals associated with a control channel.

A method, in a User Equipment (UE), for contention resolution of radio connection establishment responses from a plurality of Radio Base Stations (RBS), the method comprising:

• receiving broadcast system information on a Broadcast Channel (BCH) from the plurality of RBS;
• transmitting a radio connection establishment request to the plurality of RBS, the radio connection establishment request related to the received broadcasted system information;
• receiving a radio connection establishment response from each of at least two RBS, each radio connection establishment response comprising a set of Downlink (DL) demodulation reference signals associated with a corresponding DL control channel;
• obtaining measurement results by performing measurements of the received radio connection establishment responses;
• selecting a first RBS responsible for communication with the UE based on the obtained measurement results.

A Radio Base Station (RBS) for communicating radio connection establishment information using Orthogonal Frequency Division Multiplexing (OFDM) to a plurality of User Equipment (UE), the RBS comprising:

• a transceiver configured to:
• broadcast system information related to establishing a radio connection on a Broadcast Channel (BCH) using a Multicast Broadcast Single Frequency Network (MBSFN) radio transmission format to the plurality of UE;
• receive a radio connection establishment request from a UE related to the broadcasted system information;
• a scheduler operatively connected to the transceiver and configured to schedule the transceiver to broadcast the system information synchronously in time with at least another RBS broadcasting the same system information on BCH using MBSFN radio transmission format;
• a processor operatively connected to the scheduler and to the transceiver, the processor configured to determine, based on the received radio connection establishment request, a set of Downlink (DL) demodulation reference signals associated with a DL control channel;
• wherein the transceiver further is configured to transmit, to the UE, a radio connection establishment response comprising the set of DL demodulation reference signals.

A User Equipment (UE) for contention resolution of radio connection establishment responses from a plurality of Radio Base Stations (RBS), the UE comprising:

• a transceiver configured to:
• receive broadcast system information on a Broadcast Channel (BCH) in dedicated sub-frames from the plurality of RBS;
• transmit a radio connection establishment request to a number of RBS based on the received broadcast system information;
• receive radio connection establishment responses from each of at least two RBS, wherein the radio connection establishment responses each comprise a set of Downlink (DL) demodulation reference signals associated with a corresponding DL control channel;
• a processor connected to the transceiver and configured to:
• obtain measurement results by performing measurements of the received radio connection establishment responses;
• select a first RBS to be responsible for communication with the UE based on the obtained measurement results.