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Methods, systems and units of a distributed base staton system for handling of downlink communication

A distributed base station and downlink technology, applied in the field of distributed base station systems

Pending Publication Date: 2020-08-25
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will increase further when the antenna size increases to e.g. 128 and 256 etc.

Method used

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  • Methods, systems and units of a distributed base staton system for handling of downlink communication
  • Methods, systems and units of a distributed base staton system for handling of downlink communication
  • Methods, systems and units of a distributed base staton system for handling of downlink communication

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Embodiment Construction

[0028] According to an embodiment, in order to divide the RAN processing functionality more efficiently between the RRU and the BBU when the RRU has multiple antennas, the present invention proposes to decompose the precoding coefficients into two parts, where the first part is determined in the RRU , and the smaller second part is determined in the BBU and sent from the BBU to the RRU. Then, at the RRU, the first and second parts of the precoding coefficients are used to precode the signal to be transmitted from the RRU to the UE via the multiple antennas. With such a solution, a cost-effective use of fronthaul link capacity is achieved with good air interface performance and cost-effective RRU at the same time.

[0029] figure 2 A wireless communication network is shown in which the invention may be used. The wireless communication network includes a distributed base station system 100 which in turn includes a BBU 110 and an RRU 120 . The BBU 110 has communication with o...

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PUM

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Abstract

A method is disclosed performed by a RRU (120) of a distributed base station system (100), which further comprising a BBU, (110) connected to the RRU. The RRU (120) is arranged to wirelessly communicate with at least one UE (131, 132, 133). The method comprises determining a downlink channel estimate from received uplink signals and determining a first part of precoding coefficients to be used forprecoding signals to be sent downlink to the at least one UE based on the determined downlink channel estimate. The method further comprises receiving a second part of the precoding coefficients fromthe BBU (110), and precoding downlink signals of data received from the BBU using the first and the second part of the precoding coefficients and sending the precoded downlink signals to the at leastone UE (131, 132, 133) via the plurality of antennas.

Description

technical field [0001] The present disclosure generally relates to methods, systems and units for a distributed base station system handling downlink communications. More specifically, the present disclosure relates to an RRU of a distributed base station system of a wireless communication network and a method performed by such an RRU, wherein the distributed base station system further includes a BBU connected to the RRU, and the RRU is connected to multiple antennas, and the RRU Wirelessly communicate with at least one UE through the plurality of antennas. The present disclosure also relates to corresponding methods and systems and computer programs and carriers for wireless communication networks. Background technique [0002] In a centralized radio access network C-RAN (also known as a distributed base system radio access network RAN), processing is carried out by two independent units: the remote radio unit RRU and the baseband unit BBU. The BBU is connected to the RR...

Claims

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Application Information

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IPC IPC(8): H04B7/024H04B7/0456H04B7/0413H04B7/06H04W88/08
CPCH04B7/024H04B7/0456H04B7/0478H04B7/0617H04W88/085H04B7/0634
Inventor E.特洛耶吕晨光M.伯格黄叶子
Owner TELEFON AB LM ERICSSON (PUBL)