Resource scheduling method utilized in operations sensitive to downward error in OFDM

A resource scheduling and business technology, applied in the direction of network traffic/resource management, error correction/detection using convolutional code, frequency modulation carrier system, etc., can solve problems such as little reference effect

Inactive Publication Date: 2003-12-24
TSINGHUA UNIV
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Problems solved by technology

However, the wireless transmission technology used by these systems is quite differen

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  • Resource scheduling method utilized in operations sensitive to downward error in OFDM
  • Resource scheduling method utilized in operations sensitive to downward error in OFDM
  • Resource scheduling method utilized in operations sensitive to downward error in OFDM

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Embodiment Construction

[0047] Table 1 Transmission scheme

[0048] Different users decide the algorithm of the recommended data rate according to the size and importance of the amount of data to be transmitted, as well as the changing characteristics of the channel. For users with high requirements, the current amount of data that can be transmitted can be calculated in a short period of time, and a relatively accurate algorithm of information theory capacity can be used. On the contrary, for users with very low data volume and relatively low QOS index, a relatively rough method of looking up the average signal-to-noise ratio threshold can be used.

[0049] During initialization, the base station analyzes the received ACK information. If it is found that a mobile station has a retransmission request, the system enters the second sub-process to schedule data that needs to be retransmitted. We think that the priority of the retransmitted data is higher than all o...

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Abstract

The invented method includes following steps with characters of supporting hybrid automatic feed back request (HARQ) technique. In preparing step, the dispatching cycle is fixed. Several adjacent subcarrier waves constitute the sub band. The resource composed of several sub bands is dispatched once a time in each time slot. Then, the mobile station feeds back the word of data rate control (DRC) obtained by quantizing average S/N ratio based on each sub band. In the step of dispatching retransmission data, after calling out the parameters of the scheme at last transmission for retransmission data, the retransmission data are fed back for several transmissions, which have largest DRC, in user's all available sub bands. The invention uses the low error rate of HARQ method and gives attention to both of fairness and system efficiency, and processes low feedback quantity and control amount of information.

Description

technical field [0001] The resource scheduling method for error-sensitive services under OFDM belongs to the resource scheduling technology in the field of wireless communication. Background technique [0002] The growing demand for wireless data services requires communication systems to transmit various types of data flexibly and at high speed, such as high-speed multimedia services, low-speed Internet browsing and low-speed voice services. These services can be divided into delay-sensitive and error-sensitive types. Delay-sensitive services have high requirements on transmission delay and delay jitter, but a certain degree of transmission error can be tolerated. The error-sensitive business has higher requirements on the accuracy of data transmission, but there is no strict delay requirement, so it can also be called non-real-time business. For this kind of business, it is suitable to adopt HARQ technology to further improve its bit error performance. How to schedule l...

Claims

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Application Information

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IPC IPC(8): H03M13/23H04B7/26H04J11/00H04L12/24H04L27/10H04L27/26H04W28/04
Inventor 周世东肖亮王京周春晖粟欣
Owner TSINGHUA UNIV
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