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Uplink interference coordination method of LET-Advanced relay system

A technology for interference coordination and relay systems, applied in power management, electrical components, wireless communications, etc., can solve problems such as poor user satisfaction, low spectrum utilization, and low network throughput, so as to improve system throughput and improve Spectrum utilization and the effect of reducing uplink interference

Active Publication Date: 2014-06-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing frequency reuse schemes for suppressing inter-cell interference are static and cannot adapt to the dynamic changes of the load inside the cell, and its method of allocating fixed bandwidth according to user identity makes the spectrum utilization rate low
At present, many interference coordination technologies applicable to the LTE-Advanced relay system are based on the above-mentioned technologies used in the LTE system, and do not take into account the new characteristics of the new system, so there is a spectrum utilization rate caused by inter-cell interference. Low performance, low network throughput, and poor user satisfaction

Method used

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  • Uplink interference coordination method of LET-Advanced relay system
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  • Uplink interference coordination method of LET-Advanced relay system

Examples

Experimental program
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Effect test

Embodiment 1

[0020] figure 2 It is a flow chart of the uplink interference coordination method applicable to the LTE-Advanced relay system of the present invention, comprising the following steps:

[0021] Step 201: Initially allocate spectrum resources to each user in each cell in the LTE-Advanced relay system;

[0022] Step 202: Combining the OI information and the RSRP value to determine the type of each user UE in the cell, whether it is a direct UE or a relay UE;

[0023] Step 203: judging whether operations such as dynamic spectrum allocation and power adjustment have been performed successively on each cell in the LTE-Advanced relay system, if yes, the operation ends, if otherwise, perform step 204;

[0024] Step 204: According to the result of step 201 and the user type determined in step 202, HII information is counted;

[0025] Step 205: The cell eNodeB executes a dynamic spectrum allocation strategy in combination with step 204;

[0026] Step 206: Perform open-loop power adj...

Embodiment 2

[0028] image 3 It is a flowchart of user type determination involved in the present invention, and the method includes the following steps:

[0029] Step 301: The eNodeB detects PRBs in the cell that are subject to uplink interference, and passes X 2 The interface (that is, the interface between the base station and the base station) sends OI information (Overload Indicator, OI for short) to the adjacent cell. The OI information indicates the PRB that is highly interfered by the adjacent cell, thereby determining the interfering user;

[0030] Step 302: According to the result obtained in step 301, measure the RSRP values ​​of all neighboring cells and the cell where the user is located for each of the users who are determined to cause interference; find out the maximum value of the RSRP values ​​of the neighboring cells, and record it as RSRP max ; Denote the RSRP of the serving cell as RSRP 0 ;

[0031] Step 303: RSRP max with RSRP 0 Compare to determine the main inter...

Embodiment 3

[0038] Figure 5 It is a flowchart of dynamic spectrum allocation involved in the present invention, and the process includes the following steps:

[0039] Step 501: Count the HII information shared between cells, and obtain the list of PRBs vulnerable to interference of relay UEs in neighboring cells;

[0040] Step 502: Combine the bandwidth allocation of the relay UE in the current cell with the execution result of step 501, find out the PRB that is free and will not interfere with the relay UE in the neighboring cell, and record it as the free resource block set FPRB s ;

[0041] Step 503: From FPRB s Select the PRB to reassign to the interfering relay user; (

[0042] Step 504: judging whether there are remaining free resource blocks, if yes, execute step 505, if otherwise, execute step 506;

[0043] Step 505: set the FPRB s The remaining PRBs in are allocated to direct users;

[0044] Step 506: The dynamic resource allocation ends.

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Abstract

The invention discloses an uplink interference coordination method of an LET-Advanced relay system. The method includes the following steps that according to interactive high-interference indicating OI information among eNodeBs and RSRP values of all UE, the UE of a cell is divided into the direct-connection UE and the relay UE; after the types of the UE are determined, the cell eNodeBs are used for achieving dynamic spectrum allocation according to the HII information by combining the bandwidth distribution condition of the relay UE of the cell; loop-opening power regulating is carried out on the UE conforming to conditions in the cell and the handling capacity is summed up. Compared with the prior art, frequency domain coordination and power control are combined, interactive information among bases of all cells in the LET-Advanced relay system are utilized for obtaining the use condition of physical resource blocks of adjacent cells and resource blocks which are not interfered are allocated to interfered users. Under the condition that interference on the adjacent cells is not enhanced, transmitting power of the direction-connection users is properly regulated. By means of the uplink interference coordination method of the LET-Advanced relay system, the uplink interference of the LET-Advanced relay system is greatly relieved, the spectral efficiency and the handling capacity of the system are improved and the degree of satisfaction of the direct-connection users are improved.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular, relates to an uplink interference coordination method applicable to an LTE-Advanced relay system. Background technique [0002] LTE-Advanced is an evolved version of LTE (Long Term Evolution) technology, started in March 2008, and confirmed the requirements in May 2008. In order to meet the higher demand and more applications of the wireless communication market in the next few years, LTE-Advanced will reach a peak rate of 1Gbit / s for downlink and 500Mbit / s for uplink. Relay is a key feature of LTE-Advanced stipulated in 3GPP Release10, which can expand cell coverage area and improve cell capacity. However, the relay (RN) also brings more complex interference situations to the LTE-Advanced system. LTE-Advanced adopts Orthogonal Frequency Division Multiplexing (OFDM) technology, and each UE (UE) in a cell occupies different mutually orthogonal subcarriers, so there is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/10H04W24/02H04W52/04
Inventor 苏寒松李亚男刘高华
Owner TIANJIN UNIV
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