A method for multiplexing uplink transmission resources in a cellular wireless communications network, the method performed at a user equipment,UE, and comprising the steps of: receiving a signal indicating allocation of first uplink transmission resources to the UE for a configured grant transmission; and receiving an overlap indication from a base station indicating an overlap of the first uplink transmission resources with uplink resources allocated to at least one other UE; wherein the overlap indication also indicates changes to parameters of the configured grant transmission; and wherein the overlap indication comprises an indication of resources that overlap which comprises a bitmap of 14 bits that are mapped to the first uplink transmission resources in one mapping option among a plurality of mapping options, in which a first mapping option is associated with a number of partitions of the first uplink transmission resources in one slot in a time domain and a first number of symbols in each partition of the first uplink transmission resources in the time domain and associated with a second number of physical resource blocks in each partition of the first uplink transmission resources in a frequency domain, and a second mapping option is associated with a number of partitions of the first uplink transmission resources in one slot in a time domain and a third number of symbols in each partition of the first uplink transmission resources in the time domain and associated with a fourth number of physical resource blocks in each partition of the first uplink transmission resources in a frequency domain, wherein each bit of the bitmap indicates: a frequency portion of 1/14th of physical resource blocks over a full slot of the first uplink transmission resources in the first mapping option, or a frequency portion of 1/7th of physical resource blocks over half a slot of the first uplink transmission resources in the second mapping option. receiving a signal indicating allocation of first uplink transmission resources to the UE for a configured grant transmission; and receiving an overlap indication from a base station indicating an overlap of the first uplink transmission resources with uplink resources allocated to at least one other UE; wherein the overlap indication also indicates changes to parameters of the configured grant transmission; and wherein the overlap indication comprises an indication of resources that overlap which comprises a bitmap of 14 bits that are mapped to the first uplink transmission resources in one mapping option among a plurality of mapping options, in which a first mapping option is associated with a number of partitions of the first uplink transmission resources in one slot in a time domain and a first number of symbols in each partition of the first uplink transmission resources in the time domain and associated with a second number of physical resource blocks in each partition of the first uplink transmission resources in a frequency domain, and a second mapping option is associated with a number of partitions of the first uplink transmission resources in one slot in a time domain and a third number of symbols in each partition of the first uplink transmission resources in the time domain and associated with a fourth number of physical resource blocks in each partition of the first uplink transmission resources in a frequency domain, wherein each bit of the bitmap indicates: a frequency portion of 1/14th of physical resource blocks over a full slot of the first uplink transmission resources in the first mapping option, or a frequency portion of 1/7th of physical resource blocks over half a slot of the first uplink transmission resources in the second mapping option. a frequency portion of 1/14th of physical resource blocks over a full slot of the first uplink transmission resources in the first mapping option, or a frequency portion of 1/7th of physical resource blocks over half a slot of the first uplink transmission resources in the second mapping option.