Methods for improving differential encoding based measurement reporting

An apparatus for Differential Measurement Reporting performed by a user equipment (UE) in a wireless communication system, the apparatus comprising a wireless transceiver, a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to, when executed by the processor, cause the apparatus to improve Differential Encoding based Measurement Reporting for Transmission between the user equipment (UE) in a communication system wherein the user equipment (UE) includes a transceiver configured to receive quantities representing the quality of the transmission of the communication system to be reported and wherein the user equipment (UE) measures the quantities to be reported by perform operations comprising:

• if more than two measured quality values are to be reported and are within a value set of a predefined codebook of differential values, a reduction of the number of feedback bits send from user equipment (UE) used for the representation of the measured quality values is proceeded;
• and
• wherein the user equipment (UE) sends a maximum value of the number of feedback bits coded and sends a minimum value among number of values to be reported, wherein the communication system determines the number of levels in-between the maximum value and the minimum value among the values to be reported and generates a reduced feedback codebook for decoding the remaining values based on its prior knowledge of the number of levels between the maximum and minimum values in the original codebook user equipment (UE) generates the same reduced feedback codebook based on its prior knowledge of the number of levels between the maximum and minimum values in the original codebook and sends then the remaining measured quality values by encoding them with reduced number of bits according to the reduced feedback codebook.