A communication method and wireless communication system for realizing multi-user scheduling

Abstract

The invention discloses a communication method and system for realizing multi-user scheduling in a wireless communication system. The method includes: subdividing and multiplexing the physical resources of the wireless communication system for multiple users to access in parallel at the same time; downlink transmission is based on OFDMA and multi-user multiple-input multiple-output mechanism; The transmission is based on OFDMA or OFDMA combined with time division; the access point sends a multi-user polling frame or channel detection frame carrying an uplink transmission resource indication; the user station performs data transmission according to the resource indication and feeds back the status information of each channel; the system selects the downlink User group for data transmission, and send data to users in the user group. According to the present invention, the MAC layer scheduling mechanism that allows multiple users to access at the same time, and comprehensively considers the uplink and downlink services, realizes two-way communication in the wireless communication system, can significantly reduce the access delay and improve the system throughput, and meet more requirements Multimedia service access.

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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