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Q algorithm-based dynamic duty ratio coexistence method for LTE-U and Wi-Fi systems in unauthorized frequency band

A technology of unlicensed frequency band and dynamic duty cycle, applied in electrical components, wireless communication, network planning, etc., can solve the problems of uncontrollable WiFi access mechanism and unsatisfactory performance

Active Publication Date: 2017-01-11
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In reality, due to the complexity of the wireless environment and the uncontrollability of the WiFi access mechanism, the traditional time-division multiplexing coexistence method is not ideal for solving the coexistence problem of LTE-U and WiFi systems

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  • Q algorithm-based dynamic duty ratio coexistence method for LTE-U and Wi-Fi systems in unauthorized frequency band
  • Q algorithm-based dynamic duty ratio coexistence method for LTE-U and Wi-Fi systems in unauthorized frequency band
  • Q algorithm-based dynamic duty ratio coexistence method for LTE-U and Wi-Fi systems in unauthorized frequency band

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Embodiment Construction

[0040] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Aiming at the coexistence problem of LTE-U and WiFi at 5GHz, the present invention proposes a dynamic duty ratio scheme based on Q algorithm on the unlicensed frequency band of LTE-U and WiFi system. Different from the traditional time division multiplexing coexistence scheme, the present invention divides time into several transmission periods T, and LTE uses 2GHz and 5GHz at the same time by means of CA technology. In addition, LTE-U will adopt the LAA transmission method, that is, important control data will be transmitted on 2GHz, and user data will be transmitted on 5GHz. In this way, even if the transmission of LTE-U on 5GHz is interrupted, the important data of LTE-U users will not be lost.

[0042] In the scheme, LTE-U users maintain their transmission on 2GHz on the one hand, and transmit on 5GHz according to the transmissi...

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Abstract

The invention relates to a Q algorithm-based dynamic duty ratio coexistence method for LTE-U and Wi-Fi systems in an unauthorized frequency band, and belongs to the technical field of wireless communication. With the aid of a Q learning algorithm, the transmission time of an LTE-U system in a next transmission period T is obtained according to the total throughput of the LTE-U system and a Wi-Fi system in a current transmission period T, and thus, expected network throughput is achieved, and the coexistence performance of the LTE-U system and the Wi-Fi system is improved. The method starts from the perspective of improving the overall network throughput, and supposes that data is transmitted via the Wi-Fi system all the time within T. The LTE-U system determines the transmission time ratio thereof within T according to the result of the Q learning algorithm, and then records the overall network throughput in the current T under the transmission time ratio to provide a basis for the selection of transmission ratio in next Q learning algorithm. The method fully considers the situation in which the throughput of the Wi-Fi system sharply declines due to transmission interference of the LTE-U system when the LTE-U system and the Wi-Fi system coexist, and can be applied to a user moving scene under the premise of coexistence of the LTE-U system and the Wi-Fi system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a dynamic duty ratio coexistence method based on a Q algorithm for LTE-U in an unlicensed frequency band and a WiFi system. Background technique [0002] With the rapid development of wireless communication technology, more and more wireless applications enrich people's life. The explosive growth of high-volume services has exacerbated the current shortage of spectrum resources. It is predicted that by 2020, wireless data services will increase 1,000 times compared to 2010. For this reason, many companies in the industry have proposed the idea of ​​using the LTE system on the 5GHz unlicensed frequency by means of a carrier aggregation technology (Carrier Aggregation, CA), that is, LTE-U. The wider spectrum greatly improves the throughput of the LTE system, but considering that the transmission performance of the unlicensed frequency band is not stable, in order to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04W74/08
Inventor 黄晓舸刘思嘉李扬扬陈前斌何强
Owner CHONGQING UNIV OF POSTS & TELECOMM
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