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Inter-cell interference restraint method, base station and system for restraining inter-cell interference

An inter-cell interference and base station technology, applied in transmission systems, multi-frequency code systems, electrical components, etc., can solve problems such as heavy burden, complex execution process, and large workload, and achieves a reduction in burden, operation complexity, and flexibility. good operation effect

Active Publication Date: 2008-08-13
TD TECH COMM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, regardless of the randomization, cancellation method, or coordination / avoidance method, a large amount of coding and calculation according to the scheduling algorithm are required in the process of suppressing inter-cell interference, and the execution process is relatively complicated; moreover, these coding and calculation The operation also makes the transmitting end or receiving end participating in OFDM transmission need to perform a large workload, and the burden is heavy

Method used

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  • Inter-cell interference restraint method, base station and system for restraining inter-cell interference
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  • Inter-cell interference restraint method, base station and system for restraining inter-cell interference

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Embodiment 1

[0059] In this embodiment, the network side assigns priorities to each frequency band for each cell in advance, and the basis for the allocation is that corresponding frequency bands of adjacent cells have different priorities.

[0060] In the OFDM system, the bandwidth is generally divided into two types: wide bandwidth and narrow bandwidth. Among them, 20MHz, 15MHz, 10MHz, and 5MHz are wide bandwidths; 2.5MHz, 1.6MHz, and 1.25MHz are narrow bandwidths. In this embodiment, when assigning priorities, firstly, the entire frequency range is divided into one or more frequency bands in units of each frequency width, and then priorities are assigned to each frequency band corresponding to each frequency width, and the corresponding frequency bands of adjacent cells Bands have different priorities.

[0061] image 3 A schematic diagram of the priority allocation of the wide bandwidth when the entire frequency range is 0-20 MHz is shown. see image 3 , when the bandwidth required...

Embodiment 2

[0074] On the basis of Embodiment 1, this embodiment adds the operation of assigning priorities to RUs in the frequency band according to the UE's occupancy status of RUs, so as to reduce the problems caused by multiple UEs in the same or adjacent cells selecting adjacent RUs. interference, thereby further improving the transmission quality of OFDM signals.

[0075] In an OFDM system, each frequency band is divided into multiple RUs, and each RU includes M subcarriers, where M is greater than or equal to 1. For example, every 375KHz is one RU, and there are 53 RUs in the frequency range of 20MHz. In this embodiment, each RU in each frequency band is assigned a priority in advance. In addition, when the RU is allocated to the UE, the UE accesses the network, and the UE releases the RU, the base station updates the priority of the RU.

[0076] Figure 5 A schematic diagram of RU priority allocation in this embodiment is shown. see Figure 5 , Each frequency band within the ...

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Abstract

The invention discloses a method for rejecting interference between cells, which includes: A. determining frequency bandwidth according to service type of user equipment UE when it is determined that allocating downlink resource for UE is needed; B. selecting frequency band which is not occupied by adjacent cells from available downlink resources of the cell where the UE is located based on determined frequency bandwidth, and allocating the same to the UE. The invention also discloses a base station, including interference rejection unit, receiving available downlink resources of the cell where the UE is located from external, determining frequency bandwidth according to service type of user equipment UE when it is determined downlink resource needs to be allocated for UE, and selecting frequency band which is not occupied by adjacent cells from available downlink resource, allocating the same to the UE. Moreover, the invention also provides a system for rejecting interference between cells, which includes wireless network controller and base station. The inventive scheme can realize rejection of interference between cells by simple operation.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a method for suppressing inter-cell interference in an Orthogonal Frequency Division Multiplexing (OFDM) system, a base station and a system for suppressing inter-cell interference. Background technique [0002] With the rapid development of wireless communication technology and the continuous improvement of communication equipment functions, in order to improve the spectrum utilization rate of wireless communication system and provide higher data transmission rate, and then improve the third generation (3G) mobile communication technology in the mobile communication market To be competitive, the 3rd Generation Partnership Project (3GPP) organization has proposed a Long Term Evolution (LTE) system capable of supporting an uplink rate of up to 100 Mbps and a downlink rate of 50 Mbps. [0003] One of the candidate core technologies that the LTE system pays more attention to is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04Q7/36H04B1/707H04L27/26H04W72/54
Inventor 李蓉沈东栋张大勇
Owner TD TECH COMM TECH LTD
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