A media access control method based on the OFDMA technology

A technology of orthogonal frequency division multiple access and media access control, which is applied in the communication between multiple stations, diversity/multi-antenna system, multi-frequency code system, etc. Reduce access delay and other issues to reduce signaling interaction, improve system performance, and improve system efficiency

Active Publication Date: 2007-08-15
BEIJING STARPOINT TECH COMPANY
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Problems solved by technology

For the current classic MAC methods, such as PRMA protocol and MPRMA protocol, the PRMA protocol combines the slotted-ALOHA access method, and the MT uses the slotted-ALOHA access method to compete for the available time slot of the uplink channel to access the base station, and only the voice service Reservations can only be made, and data services cannot continue resource reservations; while the MPRMA protocol is an improvement to the PRMA protocol. At the end of the access competition time slot, the BS notifies each mobile station of the access status through an ACK message. After the MT is allowed to access, Select the available time slot closest to the access competition time slot to send data, and indicate whether reservation is required through the flag bit. Although this protocol allows voice users and data users to make reservations, the access method still uses time division multiplexing (TDMA) technology , cannot be applied to advanced OFDMA / TDD systems to dynamically and flexibly allocate system resources, and thus cannot meet the requirements of future mobile communications to increase system capacity, reduce access delay, and reduce system cost

Method used

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  • A media access control method based on the OFDMA technology
  • A media access control method based on the OFDMA technology
  • A media access control method based on the OFDMA technology

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Embodiment Construction

[0031] In order to make the purpose, technical method and advantages of the present invention more clear, the present invention, especially the access process of the inventive method, the adaptive change of the system access probability threshold, and the dynamic resource allocation mechanism will be further described below in conjunction with the accompanying drawings and specific preferred embodiments. describe.

[0032] As shown in Figure 1, in the MAC frame structure of the TDD mode of the inventive method, the uplink stage is composed of an access time slot and an uplink transmission time slot, and a user (MT) initiates an access request in the access time slot, and the access method adopts In order to reduce the probability of user collision and the MT side Deal with complexity. The detailed access control process will be described in conjunction with preferred embodiments below. MT uses transmission time slots to send user services. In order to effectively and dynamic...

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Abstract

The disclosed media access control method based on FDMA comprises: with resource pre-served mechanism, setting flag bit in user data package to show whether pre-serve same resource in next frame, and adjusting transmission resource from BS to mobile platform according to data quantity in buffer. This invention improves system efficiency.

Description

technical field [0001] The present invention relates to an Orthogonal Frequency Division Multiple Access (OFDMA) system, in particular to a medium access control (MAC) method based on OFDMA technology. Background technique [0002] With the rapid development of mobile communication technology and the rapid growth of user demand, multimedia services such as audio, video, images, and the Internet will become the dominant services of future mobile communications, and these services have significantly increased requirements for wireless link transmission capabilities. In this case, Orthogonal Frequency Division Multiplexing (OFDM) technology is gradually emerging. OFDM technology will not only have the ability to resist multipath delay, but also completely eliminate the intersymbol interference (ISI) caused by multipath delay. At present, OFDM technology has been adopted by several communication standards, and has been basically recognized as the next generation of mobile One o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/22H04B7/26H04B7/04H04L27/26H04L12/56H04W28/26H04W72/04H04W74/08
Inventor 田辉张平高有军孙雷徐海博王爽陶小峰
Owner BEIJING STARPOINT TECH COMPANY
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