Adaptive scheduling method of DL-MAP for 802.16 systems
Publication Date: 2014-Feb-13
The IP.com Prior Art Database
AbstractIn 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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Adaptive scheduling method of DL
Adaptive scheduling method of DL- --MAP for MAP for
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
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:
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1 4 7 10
P R E A M B
The adaptive DL-MAP scheduler is below:
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DL-MAP training unit Wireless feature acquirement unit DL-MAP decision unit
Full scheduling module
Statistical learning module
User level information
Network level information collection
DL-MAP IE scheduling
The following picture shows user level wireless feature indicator...