Telefonaktiebolaget Lm Ericsson (publ)

Leonardo Ramalho

Miguel Berg

Chenguang Lu

Aldebaro Klautau

Elmar Trojer

Per-Erik Eriksson

Stefan Höst

Marcos Takeda

Per Ola Börjesson

Nilma Fonseca

A method performed by an IRU of a base station system, the base station system comprising the IRU, a BBU connected to the IRU, and a first RH connected to the IRU via a packet data network. The first RH is arranged for wireless transmission in RF of a plurality of antenna carriers to UEs. The method comprises receiving, from the BBU, a plurality of first digital representations of the plurality of antenna carriers of the first RH, each first digital representation representing one antenna carrier, the plurality of first digital representations being received in a baseband frequency range, frequency multiplexing the plurality of first digital representations of the plurality of antenna carriers into a second digital representation over a first bandwidth, and transmitting the second digital representation to the first RH.

Methods, intermediate radio units and radio heads of base station systems for transmission of antenna carriers

Disclosed is a method performed by an IRU () of a base station system (), the base station system comprising the IRU (), a BBU () connected to the IRU (), and a first RH () connected to the IRU () via a packet data network (). The first RH () is arranged for wireless transmission in RF of a plurality of antenna carriers to UEs (). The method comprises receiving, from the BBU (), a plurality of first digital representations of the plurality of antenna carriers of the first RH (), each first digital representation representing one antenna carrier, the plurality of first digital representations being received in a baseband frequency range, frequency multiplexing the plurality of first digital representations of the plurality of antenna carriers into a second digital representation over a first bandwidth, and transmitting the second digital representation to the first RH ().

Described is a method performed by an encoder of a base station system of a wireless communication network, for handling a data stream comprising a number of consecutive IQ samples for transmission over a transmission network between a remote unit and a base unit of the base station system. The remote unit is arranged to transmit wireless signals to and receive from mobile stations, each of the number of IQ samples comprising a first number of bits. The method comprises quantizing, by a quantizer, the IQ samples or IQ prediction errors of the IQ samples with a second number of bits, wherein an amplitude range of the quantizer for the second number of bits is variable and set based on an acceptable signal quality value, entropy encoding the quantized IQ samples or IQ prediction errors applying a first entropy encoding dictionary out of a plurality of entropy encoding dictionaries, based on the set amplitude range of the quantizer, and transmitting, to a decoder, the entropy encoded and quantized IQ samples or IQ prediction errors over the transmission network.

Methods, encoder and decoder for handling a data stream for transmission between a remote unit and a base unit of a base station system

Described is a method performed by an encoder of a base station system () of a wireless communication network, for handling a bit stream for transmission over a transmission link () between a remote unit () and a base unit () of the base station system. The remote unit is arranged to transmit wireless signals to and receive from mobile stations (). The bit stream comprises a first OFDM symbol and a second OFDM symbol, each OFDM symbol comprising a number of consecutive IQ samples. The method comprises, for a first number of the IQ samples situated at a boundary between the first and the second OFDM symbol, transmitting, over the transmission link to a decoder of the base station system, the first number of IQ samples having a representation spanning a first amplitude range. The method further comprises, for a second number of IQ samples of the second OFDM symbol, following the first number of IQ samples, converting, using a predictive filter, individual of the second number of IQ samples to IQ prediction errors, where the IQ prediction errors have a representation spanning a second amplitude range that is smaller than the first amplitude range, and transmitting the IQ prediction errors over the transmission link to the decoder.

Method, decoder and encoder for handling a bit stream for transmission over a transmission link between a remote unit and a base unit of a base station system

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Marambaia-Belem-Para, Brazil

Leonardo Ramalho