Communications system with control of access to a shared communications medium

A method of communication in a communications system (1) comprising

• at least two nodes (101, 102, 103),
• a control entity (10) and
• a shared communications medium (11),
• wherein the method comprises the following steps to be carried out by the control entity:
• determining a first node;
• and
• sending a message (501, 502, 503, 504) in a first transmission mode to the first node, wherein the message contains an indication and
• the control entity will send data in a second transmission mode to the first node when the indication is a first indication;
• and
• the control entity releases the shared communications medium (11) for the node to send data in the second transmission mode when the indication is a second indication;
• wherein the second transmission mode has a higher data transmission rate and transmission complexity than the first transmission mode;
• and
• wherein the node (103) is a first node and the communications system (1) comprises a further node (104), and wherein the method furthermore comprises the following steps to be carried out by the first node when the indication is a third indication:
• sending a notification (505) in the first transmission mode to the further node, wherein the notification announces a data transmission in the second transmission mode;
• and sending data (513) in the second transmission mode directly to the further node.

A method of communication in a communications system (1) comprising

• a node (101, 102, 103),
• a control entity (10) and
• a shared communications medium (11),
• wherein the method comprises the following steps to be carried out by the node (101, 102, 103):
• receiving one or a plurality of message(s) (501, 502, 505) from the control entity or another node in the communications system, wherein the one or the plurality of message(s) was/were or is/are sent in a first transmission mode and contains/contain an indication, wherein, based on the indication,
• the node receives data sent in a second transmission mode;
• the shared communications medium (11) is released for the node for sending data in the second transmission mode;
• and the node receives data sent in the second transmission mode (512, 513)
• the node sends (510, 511, 513) data in the second transmission mode;
• wherein the second transmission mode has a higher data transmission rate and transmission complexity than the first transmission mode;
• and
• wherein the node (103) is a first node and the communications system (1) comprises a further node (104), and wherein the method furthermore comprises the following steps to be carried out by the first node, based on the indication:
• sending a notification (505) in the first transmission mode to the further node, wherein the notification announces a data transmission in the second transmission mode;
• and sending data (513) in the second transmission mode directly to the further node.