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OFDM honeycomb wireless communication method, OFDM honeycomb wireless communication system and base station

A technology of cellular wireless and communication methods, applied in the directions of wireless communication, radio transmission system, diversity/multi-antenna system, etc., can solve the problems of throughput reduction, halving, and no disclosure of multi-cellular inter-cell cooperation to remedy boundary terminals, etc. , to achieve the effect of preventing throughput decline, improving communication quality, and eliminating the bottleneck of QoS guarantee services.

Active Publication Date: 2012-11-21
HITACHI LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, by always operating as one sector, the throughput (throughput) is halved compared to the case of operating as two sectors alone, so there is a problem that the throughput of the entire system decreases as a result.
[0018] On the other hand, in the conventional recovery method for terminals at cell borders, the communication quality of terminals at cell borders has been improved by using a mode that is less likely to be interfered with by other cells, and it has not been disclosed Collaboration to remedy the borderline's end point of view

Method used

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  • OFDM honeycomb wireless communication method, OFDM honeycomb wireless communication system and base station
  • OFDM honeycomb wireless communication method, OFDM honeycomb wireless communication system and base station
  • OFDM honeycomb wireless communication method, OFDM honeycomb wireless communication system and base station

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Embodiment 1

[0048] use Figure 9 , Figure 10 The first embodiment of the present invention will be described. In the first embodiment, the base station tries inter-sector cooperation when the communication quality of the transmission destination terminal is equal to or lower than the first threshold, and cooperates when the cooperation destination sector does not overlap with a resource scheduled to be used. In the case of overlapping resources, control is performed so that the cooperation destination sector is prioritized.

[0049] Figure 9 A sequence diagram showing the first embodiment. Here, the actions of 701-707 are the same as Figure 7 Similarly, the fact that the base station performs inter-sector association processing 901 after the data transmission destination determination operation 705 is the same as Figure 7 action is different.

[0050] Figure 10 The details of the processing operation of the inter-sector association processing 901 are shown. The base station f...

Embodiment 2

[0064] use Figure 14 The second embodiment will be described. In the second embodiment, when the priority of the transmission destination terminal (the degree of need for QoS (Quality of Service) control of services such as VoIP (Voice over IP)) is equal to or greater than the second threshold, cooperation between sectors is tried, When the cooperation destination sector overlaps with the resources scheduled to be used, the cooperation destination sector is given priority. For example, in 3GPP2C.R1001-EV1.0 (2005-10), it is assumed that the main service is defined in the form of Flow Profile ID, and the base station that receives the ID of the service accepted by the transmission destination terminal can use the ID The priority is judged in association with the threshold (second threshold).

[0065] The sequence diagram of the second embodiment is the same as that of the first embodiment (refer to Figure 9 ). Figure 14 The details of inter-sector linkage operations in t...

Embodiment 3

[0068] use Figure 15 The third embodiment will be described. In the third embodiment, when the communication quality of the transmission destination terminal is equal to or lower than the first threshold, cooperation between sectors is tried, and when the cooperation destination sector overlaps with a resource scheduled to be used, the coordination source Sectors cover resources for priority.

[0069] The sequence diagram of the third embodiment is the same as that of the first embodiment (refer to Figure 9 ). Figure 15 The details of inter-sector association operation in the third embodiment are shown. 1001~1005 and Figure 10 Similarly, the only difference is that the overlay (1501) is performed when the existing communication of the cooperation destination sector overlaps with the resources used. That is, if using Figure 19 To explain, the cooperative operation is executed even for the resource 1902 which is a repetition pattern. These processes can of course be ...

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Abstract

Since the OFDM communication method does not select whether plural sectors use a same terminal as a transmission destination, or always use it as a transmission destination, giving a preference to system throughput deteriorates channel quality of a terminal in a sector boundary, while increasing channel quality in sector boundaries greatly deteriorates system throughput. In a base station, when asector transmits to a terminal in the front of a beam, only the sector performs the transmission, and when transmission is made to a terminal in a sector boundary off the direction of the beam, a different sector transmits to the same terminal using a same hopping pattern. Thereby, tradeoff between the channel quality of the terminal in a sector boundary and deterioration in system throughput canbe minimized.

Description

technical field [0001] The present invention relates to cellular wireless communication technology using Orthogonal Frequency Division Multiplexing (OFDM) in wireless communication. Background technique [0002] Currently, research and development of a wireless communication method using OFDM (Orthogonal Frequency Division Multiple, ie, Orthogonal Frequency Division Multiplexing) is in progress. OFDM creates transmitted data in the frequency domain, transforms it into a signal in the time domain by IFFT (Inverse Fast Fourier Transform), and transmits it as a wireless signal. On the receiving side, the signal is converted from the time domain to the frequency domain by FFT (Fast Fourier Transform), and the original information is extracted. [0003] OFDM cellular wireless communication systems are generally as figure 1 As shown, it is composed of a plurality of base station devices and a plurality of terminal devices. The base station apparatus 101 is connected to the netw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/26H04W88/10H04B1/713H04B1/7143H04J1/00H04J11/00H04W16/06H04W16/28
CPCH04B7/0491H04W16/06H04W16/28H04L5/0007H04L27/2626
Inventor 斋藤利行片山伦太郎吉田显彦真泽史郎
Owner HITACHI LTD