Communication method and wireless communication system for realizing multi-user dispatching

Abstract

The invention discloses a communication method and wireless communication system for realizing multi-user dispatching. The method comprises the following steps: refining and multiplexing are carried out on physical resources in the wireless communication system so that multiple users can simultaneously access the physical resources in parallel; downlink transmission is carried out based on orthogonal frequency division multiple access (OFDMA) and multi-user-multiple-input and multiple-output (MU-MIMO) mechanism, and uplink transmission is carried out based on OFDMA or OFDMA+time division multiple access (OFMA+TDMA); an access point sends a multi-user polling frame or channel detection frame which carries an uplink transmission resource indication; a user station transmits data and feeds back channel status information according to the resource indication; and the system selects a user group for downlink data transmission and sends data to the users in the user group. According to the invention, a media access control (MAC) layer dispatching mechanism allowing multiple users to access simultaneously is achieved, and uplink and downlink services are comprehensively considered to realize two-way communication in the wireless communication system, thus the access delay can be obviously reduced, the system throughput can be obviously improved, and the requirement of accessing more multi-media services can be met.

Description

technical field [0001] The present invention relates to the field of wireless communication and network technology, in particular to a communication method and a wireless communication system for realizing multi-user scheduling. Background technique [0002] At present, the mainstream technology for medium and short-distance communication is based on the wireless local area network (WLAN) defined by IEEE 802.11 series standards. In the existing WLAN system, as the number of users increases, due to the limitations of the access mechanism of Media Access Control (MAC, Media Access Control), the quality of service (QoS, Quality of Service) in multi-user scenarios Cannot be guaranteed. If the bandwidth of a single user is guaranteed, the number of users served at the same time can be increased, which will be of great help to improve the QoS quality of users, and joint use will be considered in the new generation of ultra-high-speed wireless communication systems for medium and ...

AI Technical Summary

Problems solved by technology

[0003] The existing WLAN system is mainly defined based on the IEEE 802.11 series standards. Although the physical layer PHY layer adopts orthogonal frequency division multiplexing and multiple-input multiple The protocol is still based on the DCF of Carrier Sense Multiple Access with Collision Detection (CSMA / CA, Carrier Sense Multiple Access with Collision Detection) and the PCF mechanism based on polling, so it is difficult to greatly improve the throughput of the WLAN system

In the IEEE 802.11e and IEEE802.11n standards, the improved MAC protocols, including EDCA and HCCA, have improved the overhead caused by competition and polling to a certain extent, but the traditional WLAN is still based on one-way communication. system, it is difficult to meet the increasing user access of multimedia services in the future

[0004] In the existing WLAN system, multiple users are not allowed to access the system at the same time, and each user can only occupy the channel in turn for data transmission in a time-division manner, and perform half-duplex one-way communication, which will inevitably lead to extended access time and system throughput. Low, difficult to meet more multimedia service access

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