System for connecting radio access nodes of a radio access network

A system for connecting radio access nodes of a radio access network, said radio access network comprising a plurality of radio access nodes, or cells, each of said cells providing a coverage area to a plurality of user equipments, each of said radio access nodes is splitted into:

• a common processing section which performs a main processing stage;
• and
• a plurality of remote transceiving sections, each performing a local processing stage complementing said main processing stage, being operatively connected to said common processing section, and constituting a sub-cell providing a coverage sub-area, wherein said coverage area is distributed into said coverage sub-areas, wherein
• said common processing section performs data processing functionalities between a radio resource control layer and a modulation mapper of the physical layer, said common processing section comprising the following blocks in the communication direction between the common processing section and the remote transceiving section:
• a code block segmentation, a channel coding, a rate matching, a code block concatenation, a circular buffer, a scrambling and a pre-modulation mapper;
• wherein said pre-modulation mapper block adds the following information to data stream:
• type of modulation to be applied in said remote transceiving section;
• and
• the number of radio resources reserved to a user equipment;
• wherein said radio resources are resources blocks, and said pre-modulation mapper block further adds the initial resource block where data will be mapped at said remote transceiving section to data stream, so that the output constitutes a lower data rate than the output of a common complex-modulated modulator;
• and
• wherein said plurality of remote transceiving sections include the following blocks in the communication direction between the remote transceiving section and the common processing section:
• an IQ demodulation, a downconversion, an analog to digital conversion, a cyclic prefix removal, a FFT and IFFT processing, a resource element demapper and a demodulation demapper.

A method for connecting radio access nodes of a radio access network, said radio access network comprising a plurality of radio access nodes, or cells, each of said cells providing a coverage area to a plurality of user equipments, wherein it comprises splitting each of said radio access nodes into:

• a common processing section for performing a main processing stage;
• and
• a plurality of remote transceiving sections, for performing each a local processing stage complementing said main processing stage, wherein each of said remote transceiving sections constitutes a sub-cell providing a coverage sub-area, wherein said coverage area is distributed into said coverage sub-areas,
• the method being characterised in that further comprises:
• performing, by said common processing section, data processing functionalities between a radio resource control layer and a modulation mapper of the physical layer, said common processing section comprising the following blocks in the communication direction between the common processing section and the remote transceiving section:
• a code block segmentation, a channel coding, a rate matching, a code block concatenation, a circular buffer, a scrambling and a pre-modulation mapper;
• adding, said pre-modulation mapper block, the following information to data stream:
• type of modulation to be applied in said remote transceiving section;
• and
• the number of radio resources reserved to a user equipment;
• further adding, said pre-modulation mapper block the initial resource block where data will be mapped at said remote transceiving section to data stream, so that the output constitutes a lower data rate than the output of a common complex-modulated modulator;
• and
• obtaining a lower data rate after a downconversion process than the output of a common analog to digital converted at the output of a demodulation demapper, said demodulation demapper being one of the blocks included in the communication direction between the remote transceiving section and the common processing section of said plurality of remote transceiving sections.