Multi-user scheduling method and system for full duplex cache relay system

Abstract

The invention provides a multi-user scheduling method and system for a full duplex cache relay system. The multi-user scheduling method comprises: a relay system establishing step of setting a plurality of paired source node-destination node user pairs, and a relay station working in a full duplex mode; a relay system working mode selection step of making the relay system work in a decode-and-forward mode; a source node and destination node selection step of selecting a transmission source node and a transmission destination node, namely, selecting a transmission user pair; and a scheduling step of sending a control instruction to all users by a relay node, storing information transmitted by the selected transmission source node in corresponding cache by the relay node, and extracting data from the corresponding cache to be transmitted to the destination node in order to finish user scheduling in one time slot. Through adoption of the method provided by the invention, maximum system throughput is provided; leakage of relay cache can be prevented; and the service quality of the system is ensured.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular, to a multi-user scheduling method and system for a full-duplex buffer relay system. Background technique [0002] At present, with the development of wireless communication technology, the drawbacks of the traditional wireless communication mode are becoming more and more prominent. As the next-generation 5G mobile communication standards become increasingly clear, new requirements are placed on the spectral efficiency of the next-generation wireless communication systems. Traditional communication systems all work in half-duplex mode, the most typical ones being Time Division Duplex (TDD) and Frequency Division Duplex (FDD). Orthogonal time slots or frequency bands reduce the spectrum usage of the system. At present, with the exponentially increasing trend of the access devices of the wireless communication system, the frequency spectrum utilization rate o...

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Problems solved by technology

Therefore, it is impossible to determine whether the relay node can store all the received information without overflow

[0007] 2) When the user selects, it only judges whether the cache of the relay node is empty or full, without considering the size of the specific remaining cache space

Therefore, it is impossible to judge how much data bits can be stored in the buffer in the next time slot

[0008] 3) Since there is no specific number of bits that can be transmitted in a time slot, and the remaining buffer space of the buffer corresponding to the relay node and different users in each time slot, it is impossible to compare the number of bits that can be transmitted by the user with the number of bits that the relay node can transmit. The number of bits of stored information to compare

Therefore, the following situation will occur, even if a certain user is selected, but because the amount of bits that can be transmitted by the user in one time slot is greater than the vacant buffer space of the relay node

overflow of information

[0009] 4) Since the user does not know the free buffer size of the corresponding relay node, the number of transmitted bits cannot be determined, so in addition to the information overflow at the relay node, the user's information is prone to loss, which reduces the user's service quality

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