Synergy slotted ALOHA protocol based on capture 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 effect of improving peak throughput, high diversity gain, and multiple transmission opportunities.

Active Publication Date: 2014-06-18
CHANGJIANG SURVEY PLANNING DESIGN & RES
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  • Abstract
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Problems solved by technology

[0004] The traditional coordinated slot ALOHA pr...

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  • Synergy slotted ALOHA protocol based on capture effect
  • Synergy slotted ALOHA protocol based on capture effect
  • Synergy slotted ALOHA protocol based on capture effect

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the drawings:

[0021] The cooperative time slot ALOHA based on the capture effect includes 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 the normal mode. In this mode, the probability of each user sending a data frame in each time slot is p, and the probability of not sending a data frame is 1-p. The transmissions are independent of each other; users who do not send data frames monitor others The data frame sent by the user and the correctly monitored data frame are stored in a buffer whose capacity is the size of a data frame.

[0023] (2) In the 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 sum of the received power of other data frames simultaneously sent in the network (I) plus the channel ...

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Abstract

The invention relates to a synergy slotted ALOHA protocol based on the capture effect, which comprises the following steps: (1) in each time slot, a system might be in an ordinary mode or in a retransmission mode, the initial state of the network is the ordinary mode, and a user who does not transmit a frame overhears frames transmitted by other users; (2) in an ordinary mode time slot, the user who successfully overhears the data frames of the other users transmits a reporting frame to a base station at the end of the time slot; (3) at the end of the ordinary mode time slot, the base station transmits a broadcast frame according to the received data frame and reporting frame, and the network decides whether to switch to the retransmission mode accordingly; (4) after entering the retransmission mode, the user whose buffer area is not null transmits the data framed overheard by the user at certain frequency. Compared with the traditional synergy slotted ALOHA protocol, under the condition of the same average signal noise ratio of a link, the synergy slotted ALOHA protocol based on the capture effect disclosed by the invention improves the throughput rate of system peaks.

Description

Technical field [0001] The invention belongs to the technical field of multiple access in a wireless communication network, and specifically relates to a cooperative (Cooperative) time slot ALOHA protocol. Background technique [0002] Due to the broadcast nature of the wireless channel, a data frame sent by a terminal can not only be received by the destination terminal, but can also be overheared by other nearby terminals. In cooperative communication, these terminals forward the received data frame 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), thereby Obtain diversity gain. For the time slot ALOHA protocol, which is widely used in satellite communications, wireless sensor networks, and wireless cellular networks, people have also proposed specific cooperative communication schemes to improve its throughput. [1][2] . [0003...

Claims

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Application Information

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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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