Cooperative slotted aloha method based on trapping effect

A capture effect and time slot technology, applied in wireless network protocols, electrical components, wireless communications, etc., can solve the problem of not considering the application capture effect, and achieve the effects of improving peak throughput, multiple transmission opportunities, and high diversity gain.

Active Publication Date: 2017-03-08
CHANGJIANG SURVEY PLANNING DESIGN & RES
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional cooperative slotted ALOHA method does not consider the application capture effect

Method used

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  • Cooperative slotted aloha method based on trapping effect
  • Cooperative slotted aloha method based on trapping effect
  • Cooperative slotted aloha method based on trapping effect

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0021] Cooperative slot ALOHA based on capture effect, including the following steps:

[0022] (1) In each time slot, the network may be in normal mode or retransmission mode. The initial state of the network is normal mode. In this mode, the probability of each user sending a data frame in each time slot is p, the probability of not sending a data frame is 1-p, and the sending is independent of each other; users who do not send data frames listen to other The data frame sent by the user, and the correctly monitored data frame is stored in a buffer whose capacity is the size of a data frame.

[0023] (2), in normal mode, according to the capture effect, when the received power (P) of a data frame is greater than the capture ratio (R) multiplied by the received power sum of other data frames sent simultaneously in the network (I) plus the channel Noise (N), that is, ...

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Abstract

The present invention relates to a cooperating time slot ALOHA method based on acquisition effect, which includes the following steps: (1) In each time slot, the system may be in normal mode or retransmission mode. The initial state of the network is normal mode, and users who have not sent frames overhear frames sent by other users; (2), in the normal mode time slot, users who successfully overhear other user data frames send a message to the base station at the end of the time slot Report frame; (3), at the end of the normal mode time slot, the base station sends a broadcast frame according to the received data frame and report frame, and the network decides whether to switch to the retransmission mode in the next time slot; (4), enters the retransmission mode After the transmission mode, the user whose buffer is not empty sends the monitored data frame with a certain probability. Compared with the traditional cooperative time slot ALOHA method, under the condition of the same link average signal-to-noise ratio, the cooperative time slot ALOHA method based on the acquisition effect proposed by the present invention improves the system peak throughput.

Description

technical field [0001] The invention belongs to the technical field of multiple access in a wireless communication network, and in particular relates to a cooperative (Cooperative) time slot ALOHA method. Background technique [0002] Due to the broadcast nature of the wireless channel, the data frame sent by a terminal can not only be received by the destination terminal, but also can be overheard by other nearby terminals. In cooperative communication, these terminals forward the received data frames to the destination terminal, so the destination terminal can receive multiple versions of a data frame (that is, a data frame is received after being transmitted through multiple independent channels), thus Gain diversity gain. For the time-slotted ALOHA method widely used in satellite communications, wireless sensor networks, and wireless cellular networks, people have also proposed specific cooperative communication schemes to improve their throughput. [1][2] . [0003] H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W80/02
Inventor 郑迪陈尚法杨薇刘小飞严勇张恒飞
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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