A method and system for uplink mu-mimo

Abstract

The present invention is applicable to the technical field of wireless communication, and provides an uplink MU-MIMO method and system, the method comprising: a user equipment sends a sounding reference signal to a base station, so that the base station constructs a precoding matrix according to the sounding reference signal , and generate a first scheduling message according to the precoding matrix; receive the first scheduling message sent by the base station, the first scheduling message includes a layer mapping rule and a precoding matrix; according to the first scheduling message, generate at least A MAC layer user packet data unit MAC PDU, and sending the MAC PDU, so that the MAC PDU is exchanged between the multiple user equipments; an uplink signal generated after the MAC PDU is processed on each layer ; Sending the uplink signal to the base station on the antenna. The present invention greatly improves the uplink spectrum efficiency of the system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an uplink MU-MIMO method and system. Background technique [0002] With the rapid development of mobile communication technology, mobile communication systems of various standards have appeared, for example, Global System of Mobile Communication (Global System of Mobile communication, GSM) network, General Packet Radio Service technology (General Packet Radio Service, GPRS) network, Wideband Code Division Multiple Access (WCDMA) network, CDMA-2000 network, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) network, Worldwide Microwave Interconnection Access (Worldwide Interoperability for Microwave Access, WiMAX) network, etc. These mobile communication systems usually provide data communication services in addition to voice communication services. Therefore, users can use the data communication services provided by these mobile communi...

AI Technical Summary

Problems solved by technology

[0004] On the one hand, for the method for a single user equipment (User Equipment, UE), even if other enhanced communication means are used to improve the reliability and / or throughput of data transmission of the user equipment, such as Coordinated Multipoint transmission (Coordinated Multipoint, CoMP) to improve the reliability of the user equipment at the edge of the cell, or Carrier Aggregation (CA) to improve the throughput of the user. The disadvantage of this method is that once the environment of the user equipment itself deteriorates, the throughput of the data transmission of the user equipment will be reduced. and / or reliability will drop dramatically;

[0005] On the other hand, for the method of two user equipments, in order to solve the above problems, the concept of combined communication is proposed. Under combined communication, no matter whether it is uplink or downlink data transmission, it can be forwarded by other user equipments. Among them, the user equipment The communication between them can be realized through short-distance technologies such as WIFI and Bluetooth, or through long-term evolution D2D (Long Term Evolution Device-to-Device, LTE D2D). The method of Multipe Input Mul-tipe Output, MU-MIMO is virtual Multiple Input Multiple Output (virtual Multipe Input Mul-tipe Output, virtual-MIMO), that is, the base station (evolved Node B, eNB) schedules two user equipments on the same In order to realize MIMO transmission by sending respective data on time-frequency resources, the disadvantage is that the channel orthogonality of the user equipment is required to be good, and the receiving signal-to-noise ratios of the two user equipments at the base station cannot be too different, otherwise, the channel conditions are relatively poor. Poor user equipment will be subject to strong interference. Therefore, although virtual-MIMO has gain, its application scenarios are relatively limited and the gain is small

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