Random access method for multi-antenna wireless communication system

Abstract

The invention discloses a random access method for multi-antenna wireless communication system. The method comprises the steps that a multi-antenna base station distributes a section of virtual carrier sub-time slot to each random access terminal with a need in each downlink channel time slot; in the virtual carrier sub-time slot, the base station forms a transmitting beam for each distributed terminal of a next uplink channel time slot, and transmits a virtual carrier signal by using the transmitting beam; and each random access terminal with the need judges whether a chance is provided to access the next uplink channel time slot by monitoring and detecting the virtual carrier signal. According to the method, in the case of not interfering distributed users, the random access terminals with the needs share the uplink channel time slot, and thus the system capacity is improved; compared with the traditional terminal random access method, the method provided by the invention allow each uplink time slot to serve as a random access time slot, so that the quantity of random access time slot resources is greatly increased, the utilization rate of the resources is high, and the time delay of random terminal access is short; the method can meet the large-scale access requirements of mass wireless terminals in future 5G.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a random access method of a multi-antenna wireless communication system. Background technique [0002] The fifth generation of mobile communication (5G) has become a global research and development hotspot. As the main application scenario of 5G, machine type communication (MTC) has great development prospects. MTC can realize the intelligent connection of hundreds of millions of terminals without manual intervention. This large-scale intelligent terminal connection method will create unprecedented application scenarios and economic models. It is estimated that by 2030, the number of global MTC terminal connections will be close to 100 billion, of which China will exceed 20 billion. In such a large-scale terminal connection scenario, how to meet the large-scale communication needs of MTC terminals without interfering with traditional mobile Inter...

AI Technical Summary

Problems solved by technology

[0003] The random access method in the prior art is the random access method of the LTE communication system, including non-contention-based and contention-based random access methods; in the non-contention-based random access method, the base station allocates the designated access resources For access terminals with specific needs (high time limit requirements), this access method has no terminal conflicts, but the number of accessible terminals is small; in the contention-based random access method, the number of terminals to be accessed is limited through the base station. The time and spectrum resources of the terminal send access requests, and compete with other terminals for wireless resources available for communication; because multiple terminals may simultaneously select the same pilot sequence to request access, there is a potential access conflict between terminals

[0004] Due to the limited wireless resources available for random access in the LTE system, and MTC usually has massive access requirements and high latency requirements, the random access method in the LTE system is likely to cause a large-scale terminal in the future MTC scenario. conflicts, unable to provide timely and reliable access services; on the other hand, since the data packets sent by MTC terminals are usually short, the random access method in which the terminal interacts with the base station to obtain wireless resources is efficient in terms of resource utilization and time efficiency lower

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