Abstract: In a heterogeneous wireless network that includes a macro base station and one or more micro base stations, a wireless device to wirelessly transmit, in a first time slot at a first position in a first transmission subframe, data over a first physical communication channel. An ACK/NACK control message is received over a backhaul network connection a first time period after the first time slot. A response message is transmitted to the wireless device such that when the control message is received prior to the second time slot, then the response message uses data reception information from the control message and when the control message is not received prior to the second time slot, then the response message indicates that the data was successfully received.

Abstract: A heterogeneous wireless communication network comprises a macrocell base station that includes a first transmission point, at least one microcell base station that includes a second transmission point and a controller configured to enable transmission of wireless data from the macrocell base station and the at least one microcell base station to a user equipment (UE). The controller is configured to determine a set of transmission point combinations for providing downlink data, determine, using a statistics of ACKs and NACKs received for previous downlink transmissions from the transmission point combinations, a sequence of downlink transmissions to the UE from the transmission point combinations in the set.

Abstract: In a heterogeneous network deployment that includes one or more macro base stations and one or more low power nodes, a technique can be provided to encode network operational information using phase differences in synchronization signals transmitted by a network node. The synchronization signals may be one of the first signals that a user equipment (UE) attempts to locate when attempting to join a wireless network. The phase-encoded network operational information indicates to the UE where to locate a geometry indicator transmission from a low power node that is a part of the network, but is not the node that transmits the synchronization signals. The geometry indicator transmission may include identity information for the transmitting node and may be transmitted at a pre-determined nominal transmit power.

Abstract: In a heterogeneous network deployment that includes a macro base station and a low power node, a geometry indicator is transmitted by the low power node to facilitate the calculation of a path loss difference value at a user equipment using power estimates of the received synchronization signal from the macro base station and received geometry indicator signal from the low power node. Using the estimated path loss difference value, the user equipment adjusts the power level of an initial preamble signal transmission to the macro base station.

Abstract: A relative delay between analog R.F. output signals of a plurality of digital radio transmitters in a digital radio transmitter system is controlled. At least one interface receives delay information for each transmitter. A processing unit determines the relative delay between the output signals based on the received delay information. An adjuster adjusts in the digital domain the absolute delay of at least one of the radio transmitters in accordance with the determined relative delay.

Abstract: A device (200) for controlling a relative delay between analog R.F. output signals of a plurality of digital radio transmitters (102, 104) in a digital radio transmitter system (100) is described. The device (200) comprises at least one interface (206a, 206b) for receiving delay information, a processing unit (206) for determining the relative delay between the output signals based on the received delay information and an adjusting system for adjusting in the digital domain the absolute delay of at least one of the radio transmitters (102, 104) in accordance with the determined relative delay. The invention further relates to a method for controlling a relative delay between analog R.F. output signals of a plurality of digital radio transmitters (102, 104).