Radio communication apparatus and packet scheduling method

一种无线通信装置、分组调度的技术，应用在无线通信、电话通信、选择装置等方向，能够解决指向性模式更新周期不能追踪传播环境变动等问题

Inactive Publication Date: 2005-09-07
HITACHI LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that the update period of the directional pattern cannot track the change of the propagation environment

Method used

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  • Radio communication apparatus and packet scheduling method
  • Radio communication apparatus and packet scheduling method
  • Radio communication apparatus and packet scheduling method

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Embodiment Construction

[0024] First, the method of forming fixed beams and the concept of mutual interference, which are the premise of the present invention, will be described.

[0025] FIG. 1( a ) is a conceptual diagram of a wireless communication device outputting fixed beams.

[0026] The wireless communication device 11 outputs a fixed beam 31 determined in advance by a directivity pattern using N array antenna elements. In order to perform transmission using each fixed beam 31, the wireless communication device 11 combines the weights (Weight1, Weight2, ..., WeightN) held by each array antenna element in advance with the ID (Beam ID) of each fixed beam (hereinafter referred to simply as BID) are correspondingly stored in the memory. The array weight table 32 storing these information is shown in Fig. 1(b). The radio communication device 11 refers to the array weight table 32 based on the ID of the fixed beam, performs transmission and reception using the fixed beam, and reads the array weig...

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Abstract

Cell throughput improvement and high-speed processing of the same technology are achieved by establishing an adaptive control technology of the spatial multiplexing number in consideration of interference within the cell itself applied to a wireless communication device outputting a fixed beam. Regarding the adaptive control technique involving the number of spatial multiplexing and fixed beam combination selection in consideration of interference within the cell itself, a packet scheduling method for selecting a combination of fixed beams with reference to a cross-correlation amount between fixed beams is key. On the other hand, for the high-speed processing of the same technology, it is key to use a wireless communication device that stores array weights in a memory and outputs a fixed beam by referring to the memory. By generating fixed beams, it is possible to reduce the calculation amount of array weights for each terminal. In addition, since the array weight is a fixed value, the amount of mutual interference between fixed beams is also a fixed value, and high-speed adaptive technology can be provided.

Description

technical field [0001] The present invention relates to a method and a device for scheduling packets in a cellular system using downlink communication to control the directional gain of a base station. Background technique [0002] Japanese Unexamined Patent Publication No. 2003-110486 (Patent Document 1) discloses a wireless channel scheduling method capable of supporting a smart antenna base station capable of communicating with a plurality of mobile stations at the same time. In this conventional example, spatial channels are allocated sequentially from terminals with good communication quality, and downlink signals are multiplexed (multiplexed) and transmitted. Interference due to spatial multiplexing is suppressed by using smart antennas to generate nulls. In addition, it is characterized in that by making the directivity pattern of the array antenna follow the movement of the terminal, handover is not required in the cell of the terminal. This feature indicates frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04J99/00H04M1/00H04Q7/36H04W16/28H04W72/04H04W72/08
CPCH04B7/0408H04W72/082H04W72/046H04W16/28H04W72/541
Inventor 藤岛坚三郎桑原干夫平良正宪目黒浩二冈本亨
Owner HITACHI LTD
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