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Method for fast packet scheduling of HSDPA system

A packet scheduling and fast technology, applied in transmission systems, digital transmission systems, network traffic/resource management, etc., can solve problems such as inability to provide QoS, guarantees, and increased packet loss rates

Inactive Publication Date: 2010-02-17
SUN YAT SEN UNIV +1
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Problems solved by technology

But none of these three algorithms can provide QoS guarantee in multi-service environment
Although the modified maximum weight delay first (M-LWDF) algorithm and Expo-linear algorithm have taken into account the user's QoS requirements, they have not considered the user's current QoS quality (QoS, the full name is Quality of Service, and the Chinese name is service). quality), resulting in an increase in the packet loss rate in a multi-service environment

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  • Method for fast packet scheduling of HSDPA system
  • Method for fast packet scheduling of HSDPA system
  • Method for fast packet scheduling of HSDPA system

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[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] On the premise of ensuring the throughput of users and cells, the present invention not only provides data rates that meet requirements for different services, but also effectively reduces packet loss rates, especially in high-speed mobile environments where user channel conditions change more drastically.

[0051] like figure 1 As shown, a fast packet scheduling method for an HSDPA system in a high-speed mobile environment, the packet scheduling method includes the following steps:

[0052] a) Modeling under different channel conditions respectively, and calculating the instantaneous CQI of all users in the HSDPA system according to the propagation model, the user moving speed and the distance between the user and the base station, and calculating the average CQI of the user over a period of time according to the instantaneous CQI;

[0053] b) In a s...

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Abstract

The invention discloses a method for fast packet scheduling of an HSDPA system, comprising the following steps: a) estimating downlink channel quality indicator (CQI) of each user and calculating average CQI of the users in five time slots according to movement speed of the users and simulation environment; b) determining scheduling priority according to the requirements of quality of service (QoS) and the quality of the current channels of the users and QoS levels; c) selecting the users with highest priority to carry out scheduling, determining the transport block size, the code modulation method and the number of channels according to the current CQI of the users; d) if the channels is surplus, repeating the step c until the channels are totally distributed, and thus completing one-time scheduling. In the invention, fast packet scheduling of multiusers can be realized in multi-service environment, under the condition that the packet delay of different services and the packet loss rate are ensured, and the throughput in a subdistrict is improved by utilizing multiuser diversity. The invention can be applicable to a multi-service type HSDPA system in fast-moving environment, and provides the fast packet scheduling with QoS guarantee.

Description

technical field [0001] The present invention relates to a grouping scheduling method of an HSDPA system, in particular to a fast grouping scheduling method of the HSDPA system in a high-speed mobile environment. Background technique [0002] In order to better develop mobile data services, 3GPP has improved the air interface technology of the UMTS R99 / R4 version and introduced the R5 version (HSDPA) wireless data broadband technology. Compared with the original WCDMA system, in the 3GPP R5 specification, a high-speed downlink shared channel (HS-DSCH) is introduced to support streaming media, interactive and background access bearer services. [0003] HSDPA adopts Adaptive Modulation and Coding (AMC), which enables the Node B to adjust the modulation method and coding efficiency in time according to the current channel conditions of the UE, so as to better match the data transmission rate and channel conditions, and improve cell throughput and spectrum utilization. Rate. In...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04W28/24H04W72/12
Inventor 戴宪华李勇陈莉莉庞斌陈嫦娟廖建强肖舟
Owner SUN YAT SEN UNIV
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