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Resource scheduling in wireless communication systems using beam forming

A resource scheduling and resource technology, applied in wireless communication, power management, electrical components, etc., can solve the problem of not being able to benefit

Inactive Publication Date: 2009-07-15
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, existing solutions do not enable systems to benefit from the capacity / coverage gains promised by narrow beam / adaptive antenna techniques

Method used

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  • Resource scheduling in wireless communication systems using beam forming
  • Resource scheduling in wireless communication systems using beam forming
  • Resource scheduling in wireless communication systems using beam forming

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Embodiment Construction

[0029] In order to better understand the present invention, it may be useful to begin with an overview and analysis of the prior art.

[0030] As mentioned, the inventors have realized that a major problem with scheduling algorithms for multi-beam antenna systems is how to manage interference variations. Existing conventional solutions do not allow the system to benefit from the spatial interference filtering provided by the narrow beams and are typically not designed to avoid sudden changes in transmit power due to different narrow beams caused by large disturbance changes. Where it occurs, the CQI used for scheduling and link adaptation decisions may not reflect the actual interference level when the user is actually scheduled, leading to incorrect detection of received data at the user equipment side , many retransmissions, and ultimately, inefficient handling and poor utilization of the available radio resources.

[0031] Unbalanced transmissions in different beams also ...

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Abstract

A basic idea of the invention is to provide multi-user resource scheduling and distribution based on balancing the power resources used for the different narrow beams in order to smooth the interference levels over the whole cell, area and to reduce interference fluctuations. The resource scheduling principle according to the invention is especially useful when the available resources are not fully utilized. The idea is to select, for each antenna beam of at least a subset of the antenna beams, at least two mobile users for service using the respective antenna beam during a transmission time interval (Sl), and to distribute power resources to the antenna beams for use during the transmission time interval based on the guideline of balancing the power resources among different antenna (S2).

Description

technical field [0001] The present invention relates generally to wireless or cellular communications, and more particularly to advanced resource scheduling. Background technique [0002] The use of adaptive or smart antennas is considered one of the key features for increasing the coverage and capacity of wireless or cellular systems. When beamforming is applied in a base station, several narrow beams can be generated, compared to sector / cell beams, which can be created to maintain coverage in a cell. Figure 1A Sector cell antenna beams are illustrated. While sector antennas are useful for delivering broadcast and / or control information to all mobiles in the sector cell, adaptive antennas can be used to transmit within narrow beams covering only a portion of the sector cell and receive. Figure 1B An example of a narrow antenna beam is shown. figure 2 An example of a cellular network is illustrated having a base station transmitting a sector beam, a base station transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/28H04W52/34H04W52/00H04W52/42H04W72/54
CPCH04W16/28H04W52/346H04W72/1231H04W52/42H04W72/542
Inventor B·哈格曼B·戈兰森D·英贝尼R·德伯纳迪
Owner TELEFON AB LM ERICSSON (PUBL)
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