A terminal device arranged to communicate with a base station via a relay device in a wireless communications system, the terminal device comprising: a transmitter arranged to transmit an access request message to the base station wherein the access request message comprises one from a set of access preambles that indicate relay device uplink assistance is required; a receiver arranged to receive a random access response comprising an access request grant response from the base station; and a control processor operably coupled to the transmitter and receiver and arranged to: process the access request grant response; the terminal device characterised in that the control processor is further arranged to: extract therefrom transmit power control information that comprises a power control δ msg 2 command and a power delta value for transmissions to the relay device, wherein the power delta value has a coarser granularity compared to the δ msg 2 command; map a first power level indicated in the transmit power control information to a second power level associated with a transmission via the relay device using the coarser granularity power delta value followed by a finer granularity δ msg 2 adjustment; and generate and transmit a transmission to the relay device at the mapped transmit second power level. a transmitter arranged to transmit an access request message to the base station wherein the access request message comprises one from a set of access preambles that indicate relay device uplink assistance is required; a receiver arranged to receive a random access response comprising an access request grant response from the base station; and a control processor operably coupled to the transmitter and receiver and arranged to: process the access request grant response; the terminal device characterised in that the control processor is further arranged to: extract therefrom transmit power control information that comprises a power control δ msg 2 command and a power delta value for transmissions to the relay device, wherein the power delta value has a coarser granularity compared to the δ msg 2 command; map a first power level indicated in the transmit power control information to a second power level associated with a transmission via the relay device using the coarser granularity power delta value followed by a finer granularity δ msg 2 adjustment; and generate and transmit a transmission to the relay device at the mapped transmit second power level. process the access request grant response; the terminal device characterised in that the control processor is further arranged to: extract therefrom transmit power control information that comprises a power control δ msg 2 command and a power delta value for transmissions to the relay device, wherein the power delta value has a coarser granularity compared to the δ msg 2 command; map a first power level indicated in the transmit power control information to a second power level associated with a transmission via the relay device using the coarser granularity power delta value followed by a finer granularity δ msg 2 adjustment; and generate and transmit a transmission to the relay device at the mapped transmit second power level. extract therefrom transmit power control information that comprises a power control δ msg 2 command and a power delta value for transmissions to the relay device, wherein the power delta value has a coarser granularity compared to the δ msg 2 command; map a first power level indicated in the transmit power control information to a second power level associated with a transmission via the relay device using the coarser granularity power delta value followed by a finer granularity δ msg 2 adjustment; and generate and transmit a transmission to the relay device at the mapped transmit second power level.