Patent ID: 8509204

Claim:
A method of sending control information from a first node to a second node in a communications system providing a plurality of resource units for the transmission of data, the method comprising the steps of: using a code book to send the control information; the code book comprises at least one code word identifying control information relating to data transmission over a resource unit; and the code book is dynamically updated by means of repeatedly transmitting an updated version of code book information from the first node to the second node; creating the code book; assigning a code word to at least one resource unit in a manner so that the control information identified by the assigned code word applies to the resource unit to which the assigned code word is assigned; creating resource unit usage information comprising at least one assigned code word, the resource unit usage information being indicative of at least one resource unit to which the assigned code word has been assigned; wherein an order of appearance of the assigned code word with respect to other assigned code words in the resource unit usage information signifies the at least one resource unit to which the assigned code word applies; sending the code book information to the second node; and sending the resource unit usage information to the second node; wherein the code book is dynamically updated by means of repeatedly performing the steps of creating a code book and sending code book information; and wherein the control information applicable to a resource unit comprises an identity of a session to which a resource unit should be allocated and a transmission format to be applied to the resource unit, and the code book information comprises a session identity field identifying a session to which at least two resource units should be allocated on which different transmission formats should be used, and wherein the session identity field is associated with the transmission format of the at least two resource units.