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Multi-point coordinated transmission method based on limited feedback in heterogenous network system

A heterogeneous network and multi-point coordination technology, applied in diversity/multi-antenna systems, using return channels for error prevention/detection, space transmit diversity, etc., can solve problems such as system performance degradation and limited capacity of uplink feedback links , to achieve large performance gains, reduce feedback overhead, and improve feedback efficiency

Inactive Publication Date: 2012-09-12
TSINGHUA UNIV +1
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Problems solved by technology

However, in the actual FDD (Frequency Division Duplex) system, the capacity of the uplink feedback link is limited, each user can only feed back limited information, and the BS can only obtain part of the channel information, that is: limited feedback system, its model like figure 2 As shown, this will lead to a decrease in system performance

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  • Multi-point coordinated transmission method based on limited feedback in heterogenous network system
  • Multi-point coordinated transmission method based on limited feedback in heterogenous network system
  • Multi-point coordinated transmission method based on limited feedback in heterogenous network system

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Embodiment 1

[0074] System scenario description:

[0075] In order to have a clear understanding of the present invention, the method described in the present invention will be described in detail below with specific examples.

[0076] Specifically, in an embodiment of the present invention, the scenario where the heterogeneous network system is applied is as follows: Coordinated scheduling and cooperative beamforming under limited feedback in a heterogeneous network involving multiple cells and multiple users. The scenario of the network system is as follows: image 3 shown. The entire heterogeneous network system consists of a base station eNB (macro base station) and two low-power RRHs (Remote Radio Heads), and these RRHs are connected to the central eNB through optical fibers. These RRHs are just radio heads pulled from the central eNB, which only have the function of sending and receiving but not signal processing capabilities. That is to say, these RRHs need to transmit the informat...

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Abstract

The invention provides a multi-point coordinated transmission method based on limited feedback in a heterogenous network system. The multi-point coordinated transmission method includes that quantitative channels and channel module values are fed back by users of first transmitting nodes; a plurality of users of a plurality of second transmitting modes search and find preset code words, and a feedback information set is generated according to indexes and interference values of the preset code words; weight vectors of downlink transmitting beams of the first nodes are determined by the first transmitting nodes according to shared feedback information, and scheduling users of the first transmitting nodes and scheduling users of the second transmitting nodes are determined; the scheduling users of the second transmitting nodes feed back quantitative channels of the scheduling users to the corresponding second transmitting nodes according to codebooks; and vectors of downlink transmitting beams are determined by the second transmitting nodes according to the quantitative channels, so that the first transmitting nodes and the second transmitting nodes simultaneously transmit downlink data via the respective beams. According to an embodiment of the invention, the feedback efficiency of the heterogenous network system is effectively improved, system overhead is reduced, and fine system performances are realized.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a coordinated multi-point scheduling cooperative beamforming based on limited feedback in a heterogeneous network, and a heterogeneous network system based on limited feedback in a heterogeneous network system based on coordinated multi-point transmission under limited feedback in an LTE-A system Coordinated Multi-point transmission method for feedback. Background technique [0002] Inter-cell Interference (ICI: Inter-cell Interference) in a wireless cellular network is a major factor restricting system performance. Although Multiple Input Multiple Output (MIMO: Multiple Input Multiple Output) technology can effectively improve system capacity in a single cell, in a frequency reused cellular environment, due to serious inter-cell interference (ICI: Inter-cell Interference), the system The performance is degraded, especially the QoS of the users at the edge...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04W72/12H04L1/16
Inventor 彭碧君陈巍张煜雷鸣
Owner TSINGHUA UNIV
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