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Adaptive scheduling method of DL-MAP for 802.16 systems

IP.com Disclosure Number: IPCOM000234900D
Publication Date: 2014-Feb-13
Document File: 5 page(s) / 75K

Publishing Venue

The IP.com Prior Art Database

Abstract

In order to meet the high requirements of networks, WiMAX networks based on 802.16 incorporate several qualities of service (QoS) mechanisms at the Media Access Control (MAC) level for guaranteed services for data, voice and video. The scheduling problem is to allocate available resources among users in order to meet the QoS criteria such as delay, delay jitter and throughput requirements. As we known, data resources allocation depends on DL-MAP resources occupying, but DL-MAP resources allocation subjects to data resource scheduling. Thus, scheduling in 802.16 systems is much sophisticate. Traditional approaches either focused on fix DL-MAP resource allocation with adjusting number of bursts or full optimization with DL-MAP and data. The former limits the performance when DL-MAP reaches the ceiling before data do, and the latter will bring NP problems or rollback strategies which are time consuming. Our work introduces a novel concept statistical learning of DL-MAP to solve this problem. In the traditional arts, DL-MAP scheduling and data scheduling are always done together. In our scheme, scheduling for DL-MAP and scheduling for data is separate, in DL-MAP scheduling, we using training results to decide how many resources is allocated to DL-MAP. And then data scheduling can be done by using these information.

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Page 01 of 5

Adaptive scheduling method of DL

Adaptive scheduling method of DL- --MAP for MAP for

MAP for

802.16

802.16 802.16

systems

systems

Our invention is an adaptive scheduling method of DL-MAP for 802.16 systems based on statistical learning technology. It is a novel and effective mechanism which contains the following key points:


1. Separation method of DL-MAP scheduling and data scheduling using statistical information


2. DL-MAP scheduling scheme based on the statistical information


3. Statistical information acquirement method

Advantages:

1. Dynamic and adaptive. The mechanism based on statistical learning can provide a flexible dynamic and adaptive approach to break the limitation which fixed DL-MAP resource allocation schemes have.

Loose coupling and stable. By decoupling the DL-MAP scheduling and data scheduling, scheduling becomes much easier and less time consuming.

The WiMAX frame structure(5M/DL) is shown below:

1


Page 02 of 5

symbol

     0 subchannel

1 4 7 10

37

 DL- MAP2

F

C

H

...

P R E A M B

L E

UL- MAP

 DL- MAP1

The adaptive DL-MAP scheduler is below:

2


Page 03 of 5

Scheduler

DL-MAP scheduling

DL-MAP training unit Wireless feature acquirement unit DL-MAP decision unit

Full scheduling module

Statistical learning module

User level information

collection module

Network level information collection

modue

DL-MAP maximum

resource allocation

module

DL-MAP IE scheduling

module

RLC PHY

MAC

Data scheduling

The following picture shows user level wireless feature indicator...