Abstract: A method including receiving, by a radio equipment control (REC) device of a wireless communication system over an interface link, time domain compressed data from a radio equipment (RE) device at a first data transmission rate. The method further including transforming, by the REC device, the time domain compressed data to frequency domain decompressed full rate data for a second transmission data rate utilizing a Fast Fourier processing engine of the REC device.

Abstract: Interfacing between radio units in a base station in a mobile communication system uses a common public radio interface CPRI for streaming IQ data samples and control data arranged in lanes. A separate serial interface sRIO is now additionally used for transferring selected control data arranged in packets to a controller, the selected control data being streamed between other radio units via the common public radio interface. In the radio unit, the selected control data are arranged in packets to be transmitted via the serial interface, and, vice versa, the selected control data arranged in packets received via the serial interface are arranged in lanes to be streamed. Advantageously the control data of the streaming CPRI interface is seamlessly transferred to the controller via the packet based serial interface.

Abstract: Interfacing between radio units in a base station in a mobile communication system uses a common public radio interface CPRI for streaming IQ data samples arranged in lanes. A separate serial interface sRIO is now additionally used for transferring selected data samples arranged in packets, the selected samples corresponding to selected lanes streamed between other radio units via the common public radio interface. In the radio unit, the selected data samples are arranged in packets to be transmitted via the serial interface, and, vice versa, the selected data samples arranged in packets received via the serial interface are arranged in lanes. A system timer coupled to the CPRI generates a timebase for controlling the sRIO interface in order to have it synchronized. Advantageously the data sample transfer capacity of the streaming CPRI interface is extended using the packet based serial interface.

Abstract: A system for use in nodes communicating over a CPRI (common public radio interface) allows each networking node in a daisychain configuration to seamlessly manage the control and management HDLC (high-speed data link control) channel for both uplink and downlink. The connection is kept alive through a soft reset flow. Received HDLC packets can be extracted for use by a local node. Locally generated packets can be inserted into the packet data stream at the datalink layer for onward transmission over the CPRI. The system arbitrates between the locally generated packet data held in a buffer in the local node and remote packet data received from a remote node and held in the local node in a first in first out buffer for onward transmission to a subsequent node after arbitration. Remote packet data is given priority.

Abstract: A method performed by a radio equipment control (REC) device, including storing values of link configuration registers of a radio equipment control (REC) device at shadow registers of the REC device in response to determining that a synchronization of a current communication link between the REC device and a radio equipment (RE) device has been lost. The method further including re-establishing the current communication link based on the values of the link configuration registers stored at the shadow registers of the REC device.

Abstract: A method including performing a delay measurement of a first round trip delay value of an interface link, the first round trip delay value based on a transmission of a first REC synchronization signal to a RE and when a REC receives a first RE synchronization signal back, wherein frames transmitted by the REC are synchronized based upon the first REC synchronization signal, and frames transmitted by the RE are synchronized based upon the first RE synchronization signal. Calculating a first delay change value between the first round trip delay value and a previous round trip delay value, in response to determining that the first delay change value violates a delay tolerance value, transmitting an offset indicator that indicates an amount of offset the RE is to shift the first RE synchronization signal at a future time, and transmitting frames from the REC after shifting the first REC synchronization signal.

Abstract: A method performed by a radio base station, the method including determining a link configuration of a first communication link, the first communication link being a current communication link between a first radio equipment control (REC) device and a radio equipment (RE) device. The method further including in response to determining that a second communication link between a second REC device and the RE device is to replace the current communication link, instead of the first communication link, establishing, by the second REC device, the second communication link based on the determined link configuration of the first communication link.

Abstract: A method performed by a radio base station, the method including receiving streaming data information, the data information includes a first portion from a first set of antenna carriers and a second portion from a second set of antenna carriers, wherein the first portion is to be processed prior to the second portion. The method further including streaming the first portion of the data information from a radio equipment control device in a first data frame over an interface link that is configured to operate based on a first mapping configuration that indicates a set of locations of the first data frame at which the first portion of information is to be streamed, and streaming the second portion of the data information from the REC device in a second data frame over the interface link that is configured to operate based on a second mapping configuration.

Abstract: The present application relates to a Common Public Radio Interface, CPRI, lane controller and a method of operating thereof. The CPRI lane controller comprises a transaction counter, a symbol counter and a comparator. The transaction counter is provided for maintaining a current aggregated transactions' size, Sizetrans, representative of an accumulated size of DMA transactions performed by a DMA controller in response to symbols transferred on a CPRI link from or to the CPRI lane controller. The symbol counter is provided for maintaining a current aggregated expected symbols' size, Sizeexp, representative of an accumulated size of a sequence of transferred symbols and a currently transferred symbol. The comparator is configured to issue a symbol awareness signal, SAS, in case the current aggregated transactions' size, Sizetrans, exceeds the current aggregated expected symbols' size, Sizeexp.

Abstract: A method performed by a radio base station, the method including determining that one of a Direct Memory Access (DMA) buffers of a communication link for a service provider has gone beyond a DMA buffer limit (empty or full), the communication link between a radio equipment control (REC) device and a radio equipment (RE) device that is operating based on a first bandwidth configuration of the communication link. The method further including in response to determining that the communication link is to change operation (due to reaching the DMA buffer limit) based on a second bandwidth configuration of the communication link, instead of the first bandwidth configuration, continuing operation of the communication link based on the second bandwidth configuration. The method further including that after going back under the DMA buffer limit, the communication link continuing operation based on the original first bandwidth configuration.

Abstract: The present application relates to a Common Public Radio Interface, CPRI, lane controller and a method of operating thereof. The CPRI lane controller comprises a transaction counter, a symbol counter and a comparator. The transaction counter is provided for maintaining a current aggregated transactions' size, Sizetrans, representative of an accumulated size of DMA transactions performed by a DMA controller in response to symbols transferred on a CPRI link from or to the CPRI lane controller. The symbol counter is provided for maintaining a current aggregated expected symbols' size, Sizeexp, representative of an accumulated size of a sequence of transferred symbols and a currently transferred symbol. The comparator is configured to issue a symbol awareness signal, SAS, in case the current aggregated transactions' size, Sizetrans, exceeds the current aggregated expected symbols' size, Sizeexp.

Abstract: A method including receiving, by a radio equipment control (REC) device of a wireless communication system over an interface link, time domain compressed data from a radio equipment (RE) device at a first data transmission rate. The method further including transforming, by the REC device, the time domain compressed data to frequency domain decompressed full rate data for a second transmission data rate utilizing a Fast Fourier processing engine of the REC device.

Abstract: Interfacing according to a common public radio interface in a base station in a mobile communication system is described. The interfacing comprises a conversion process for rate-converting legacy data samples. First a predetermined number of the legacy data samples is converted to frequency samples in a frequency domain, then the frequency samples are zero padded to extend the frequency range according to a related sample rate of a 4G data format and then converted into a number of data samples of the related sample rate. The related sample rate is a multiplication of S/K times a basic frame rate of the 4G data format, S samples being allocated to K frames, K and S being integers and K being 8 or less. Advantageously large buffers for allocating a large number of legacy samples to 4G frames are avoided.

Abstract: A method including performing a delay measurement of a first round trip delay value of an interface link, the first round trip delay value based on a transmission of a first REC synchronization signal to a RE and when a REC receives a first RE synchronization signal back, wherein frames transmitted by the REC are synchronized based upon the first REC synchronization signal, and frames transmitted by the RE are synchronized based upon the first RE synchronization signal. Calculating a first delay change value between the first round trip delay value and a previous round trip delay value, in response to determining that the first delay change value violates a delay tolerance value, transmitting an offset indicator that indicates an amount of offset the RE is to shift the first RE synchronization signal at a future time, and transmitting frames from the REC after shifting the first REC synchronization signal.

Abstract: A method performed by a radio base station, the method including receiving streaming data information, the data information includes a first portion from a first set of antenna carriers and a second portion from a second set of antenna carriers, wherein the first portion is to be processed prior to the second portion. The method further including streaming the first portion of the data information from a radio equipment control device in a first data frame over an interface link that is configured to operate based on a first mapping configuration that indicates a set of locations of the first data frame at which the first portion of information is to be streamed, and streaming the second portion of the data information from the REC device in a second data frame over the interface link that is configured to operate based on a second mapping configuration.

Abstract: A method performed by a radio base station, the method including determining that one of a Direct Memory Access (DMA) buffers of a communication link for a service provider has gone beyond a DMA buffer limit (empty or full), the communication link between a radio equipment control (REC) device and a radio equipment (RE) device that is operating based on a first bandwidth configuration of the communication link. The method further including in response to determining that the communication link is to change operation (due to reaching the DMA buffer limit) based on a second bandwidth configuration of the communication link, instead of the first bandwidth configuration, continuing operation of the communication link based on the second bandwidth configuration. The method further including that after going back under the DMA buffer limit, the communication link continuing operation based on the original first bandwidth configuration.

Abstract: An apparatus for facilitating the re-distribution of processing load between a plurality of radio equipment controllers arranged in a daisy chain configuration on a Common Public Radio Interface. The apparatus may be included in each REC and has two framers which may co-operate to forward IQ data of antenna carriers received on a downlink from a preceding REC to a subsequent REC in the chain and a DMA module or channel which can read IQ data from a system memory for onward transmission. In a re-allocation mode, the framer may be reconfigured so that an AxC initially allocated to a preceding REC for processing may be instead, accessed by a second (usually redundant) transmit DMA module included in the apparatus from system memory and transferred to the framer for onward transmission.

Abstract: A method performed by a radio base station, the method including determining a link configuration of a first communication link, the first communication link being a current communication link between a first radio equipment control (REC) device and a radio equipment (RE) device. The method further including in response to determining that a second communication link between a second REC device and the RE device is to replace the current communication link, instead of the first communication link, establishing, by the second REC device, the second communication link based on the determined link configuration of the first communication link.

Abstract: A method performed by a radio equipment control (REC) device, including storing values of link configuration registers of a radio equipment control (REC) device at shadow registers of the REC device in response to determining that a synchronization of a current communication link between the REC device and a radio equipment (RE) device has been lost. The method further including re-establishing the current communication link based on the values of the link configuration registers stored at the shadow registers of the REC device.

Abstract: A controller device can control the time of a slave sub-system in a chain in a base station system. The controller device comprises a slave transceiver for receiving/transmitting from/to a master sub-system, and a synchronization device for synchronizing a clock of the slave transceiver to a clock of the master sub-system based on the received signal received from the master sub-system. The synchronization circuitry comprises a clock input port for receiving an external clock signal from an external clock generator. At a received signal input port the received signal can be received from the master transceiver. A tracking loop couples the received signal input and the second phase input to a control input of a controllable PLL, for providing a negative feedback which controls a phase and/or frequency of the feedback signal to counter the phase and or frequency error between the external clock signal and the received signal.