A multi-base station cooperative transmission method when the capacity of the backbone network is limited
A backbone network capacity, cooperative transmission technology, applied in the field of multi-base station cooperative transmission, can solve problems such as high complexity and inapplicability to actual systems, and achieve the effect of high spectral efficiency
Inactive Publication Date: 2017-03-29
BEIHANG UNIV +1
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Problems solved by technology
From the perspective of information theory, the best way to make full use of the backbone network is to share some data related to rate splitting, but this method is too complex and not suitable for practical systems
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[0120] The present invention proposes a hybrid cooperative precoding method with limited backbone network capacity under a heterogeneous network, the flow chart of which is as follows figure 1 shown. Use matlab emulation platform in the embodiment, carry out emulation analysis to the performance of this method, emulation scene is as figure 2 As shown, the heterogeneous network includes 1 macro cell and 2 micro cells. The macro base station has a maximum transmit power of 46dBm and has 4 antennas. The micro base station has a maximum transmit power of 30dBm and has 2 antennas. Each cell has 1 single-antenna users. The main steps are as follows:
[0121] For the above-mentioned 3-cell heterogeneous network system, there is no interference between the two micro-cells, the two micro-users are only interfered by the macro base station (base station 0), and the macro-user (user 0) is only affected by the first micro base station (base station 1) Interference, not interfered by ...
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The invention discloses a multi-base-station cooperative transmission method used in the limited state of backbone network capacity in a heterogeneous network. The method includes the first step of calculating normalized equivalent pre-codes, based on the P-ZFBF, of an equivalent channel, a CoMP-JP mode and a CoMP-CB mode, the second step of constructing a hybrid cooperative pre-code, and conducting plural weighting combination on the CoMP-JP mode and the CoMP-CB mode to obtain hybrid pre-code vectors of a base station 0 and a base station 1 for a user k, the third step of calculating the maximum weighted sum and the data rate alpha[0]R[0]+alpha[1]R[1] and a corresponding cooperative transmission method under the condition that the limited capacity of the backbone network and the maximum transmitting power of the base station end are satisfied according to the data rate weighting coefficient alpha[0] of a user 0, the data rate weighting coefficient alpha[1] of a user 1, the capacity Cbh of the backbone network, the maximum transmitting power P[max]<0> of the base station 0, and the maximum transmitting power P[max]<1> of the base station 1, and the fourth step of calculating the optimized weighted sum and the optimized data rate according to the result of the third step. According to the multi-base-station cooperative transmission method, the optimized performance is achieved by selecting the cooperative mode with the maximum weighted sum and the optimized data rate in a self-adaptive mode.
Description
technical field [0001] The invention belongs to the field of wireless communication, relates to a heterogeneous network downlink transmission scenario, and in particular relates to a multi-base station cooperative transmission method when the backbone network capacity is limited. Background technique [0002] Research data shows that global mobile data traffic may increase 18 times between 2011 and 2016, with an average annual growth rate of 78%. The most direct way to increase network capacity is to deploy more base stations. In order to meet the needs of data services, mobile network operators deploy additional base stations in areas with high data volume requirements. In order to reduce overhead, they must be compatible with the existing network structure while deploying base stations. [2] . Therefore, the future mobile communication system will have a heterogeneous network (HetNet, Heterogeneous Network) structure, that is, the system will be composed of traditional mac...
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IPC IPC(8): H04L1/00H04L1/06
Inventor 韩圣千刘文佳杨晨阳王刚雷鸣
Owner BEIHANG UNIV