in order to transmit srs to the pico enb the ue can be configured with dedicated parameters for the srs subframe configuration the srs bandwidth configuration and a parameter for enabling disabling simultaneous srs and harq ack transmission for tdd systems a ue can further be configured with a parameter defining the maximum uplink pilot time slot uppts region both open loop and closed loop ul power control are closely related to comp operation this is because a wireless network may configure one set of transmission points for the dl of a ue and a different set of reception points for the ul of a ue referring back to fig3 for example ue 214 may be configured to send ul transmissions to pico enb 206 to minimize interference however ue 214 may still be configured to receive dl transmissions from macro enb 202 a problem of power control arises when the path loss between ue 214 and pico enb 206 is significantly different from the path loss between ue 214 and macro enb 202 the ue may be ul power controlled such that the reception at the pico enb is below a desired threshold however the macro enb 202 may still monitor ul transmissions from ue 214 for radio resource management functions or for use in the dl in tdd systems where channel reciprocity between ul and dl can be exploited therefore a reduction in power to just satisfy a reception threshold at the pico enb may degrade reception at the macro enb this problem typically arises whenever transmission points tps and reception points rps for.