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Proportional fair dispatcher using failure CQI feedback and dispatching method

A technology of proportional fair scheduling and modulation and coding scheme, which is applied in the field of WiMAX scheduling method and scheduler, and can solve the problems of poor cell throughput performance and unreliability

Inactive Publication Date: 2010-06-23
NEC (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The scheduling algorithm based on this unreliable CQI in the prior art will lead to poor cell throughput performance

Method used

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  • Proportional fair dispatcher using failure CQI feedback and dispatching method
  • Proportional fair dispatcher using failure CQI feedback and dispatching method
  • Proportional fair dispatcher using failure CQI feedback and dispatching method

Examples

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no. 1 example

[0139] Figure 4 is a flowchart showing the PF scheduling process according to the first embodiment of the present invention. It should be noted that marked with the same reference numerals as figure 2 Same or similar steps to indicate that it is the same or similar.

[0140] refer to Figure 4 , the scheduling process is described as follows.

[0141] In S201, each MS is required to report its CQI information to the BS in each frame. The CQI can be measured through a pilot signal or a data message, and can be transmitted to the BC through a signaling channel or a dedicated data channel.

[0142] At S203, after receiving the CQI information of each user, the link adaptation module may map the CQI information to its current transmission rate. Although various mapping methods are available, here, we use a threshold-based mapping method. For example, Table 1 shows a typical mapping table.

[0143] Table 1 Mapping of CQI and MCS

[0144] Modulated FEC-CC rate

...

no. 2 example

[0161] Figure 5 is a flowchart showing the PF scheduling process according to the second embodiment of the present invention. It should be noted that marked with the same reference numerals as figure 2 the same or similar steps to indicate that the same reference number is used to indicate the same figure 2 Same or similar steps to indicate that it is the same or similar.

[0162] refer to Figure 5 , the scheduling process is described as follows.

[0163] In S201, each MS is required to report its CQI information to the BS in each frame. The CQI can be measured through a pilot signal or a data message, and can be transmitted to the BC through a signaling channel or a dedicated data channel.

[0164] At S203, after receiving the CQI information of each user, the link adaptation module may map the CQI information to its current transmission rate. Although various mapping methods are available, here, we use a threshold-based mapping method. Table 1 above shows the map...

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Abstract

The present invention provides a proportional fair dispatcher used in a base station, which is suitable for high shifting environment. The proportional fair dispatcher comprises a modifying factor estimator, a measuring calculator and a transmitting chance enduing machine, wherein the modifying factor estimator is used for aiming to every user equipment in a base station sever subdistrict to estimate a modifying factor aiming to the real-time transmitting rate of the next frame according to the statistical result of channel quality changes in the current frame; the measuring calculator is used for aiming to every user equipment in the base station sever subdistrict to calculate measurement based on real time transmitting speed rate of the user equipment, the estimated modifying factor and thuoughput aiming at history recorded by the user equipment; and the transmitting chance enduing machine is used for enduing transmitting chances of the next frame to the user equipment with the best measurement in all the user equipment. In addition, the present invention also provides a proportional fair dispatching method used in the base station.

Description

technical field [0001] The present invention relates to the field of mobile communication, more specifically, to a scheduling method using imperfect CQI (channel quality information) feedback and a scheduler using the scheduling method, especially a scheduling method and a scheduler for WiMAX. Background technique [0002] Since it provides many possibilities such as high spectral efficiency, flexible spectrum selection and scalable carrier bandwidth selection, and exhibits the most outstanding mobility characteristics, IEEE 802.16 is expected to become a candidate standard for future wireless systems, it is also known as WiMAX. In order to achieve the above goals, the WiMAX physical layer (PHY) is based on OFDM (Orthogonal Frequency Division Multiplexing). OFDM is a solution with good anti-multipath effect, so that WiMAX can work under NLOS (Non-Line-of-Sight) conditions. OFDM technology is also widely recognized as a physical layer method for next generation communication...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/08H04W72/06H04W72/54H04W24/10
CPCH04W72/1231H04W72/1257H04W72/542H04W72/535
Inventor 王刚易粟夏勇
Owner NEC (CHINA) CO LTD
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