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Method for realizing coexistence of LTE-LAA system and wifi system in unlicensed frequency band

An unlicensed frequency band and algorithm technology, applied in transmission systems, wireless communications, electrical components, etc., can solve the problems of low spectrum utilization, increase system delay, etc., to enhance spectrum efficiency, avoid transmission delay, and have the the effect of compatibility

Active Publication Date: 2020-04-07
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] From the above description, we can see that although the existing methods can avoid collisions to a certain extent and realize the harmonious coexistence of the LTE system and the Wi-Fi system, there are also problems of increased system delay and low spectrum utilization.

Method used

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  • Method for realizing coexistence of LTE-LAA system and wifi system in unlicensed frequency band
  • Method for realizing coexistence of LTE-LAA system and wifi system in unlicensed frequency band
  • Method for realizing coexistence of LTE-LAA system and wifi system in unlicensed frequency band

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Embodiment 1

[0054] In order to solve the coexistence problem of the two systems, the embodiment of the present invention proposes a solution based on frequency hopping technology. Specifically, the WiFi system sends data normally, and the LTE-LAA (Licensed Assisted Access) system does not use the LBT mechanism for interception and backoff, but uses frequency hopping to send data. The LTE-LAA system first performs channel detection, puts the channels that can be sent into a channel set, and designs a reasonable frequency hopping algorithm according to the QoS (Quality of Service) of the sent data and some prior knowledge. The QoS of the data mainly considers the requirements of the data transmission rate and delay. The above-mentioned prior knowledge includes the channels often used by the WiFi system, the number of users that need to be activated in LTE-LAA, etc.

[0055] In addition to the characteristics of uniformity and randomness required by general frequency hopping algorithms, the ...

Embodiment 2

[0088] In order to verify the scheme proposed by the embodiment of the present invention, on the basis of the existing frequency hopping technology in Bluetooth, an improved frequency hopping algorithm is proposed, and its characteristics include:

[0089] 1: In order to support more users in LTE and adapt to wider bandwidth, the 79 channels in Bluetooth are expanded to 99;

[0090] 2: The bandwidth is not limited to 1MHz, but is suitable for various bandwidths of the LTE system from 1.4MHz to 20MHz;

[0091] 3: The frequency hopping generation algorithm similar to the existing Bluetooth system is adopted, and the randomness and uniformity of the obtained algorithm are maintained.

[0092] The details are as follows:

[0093] channel definition

[0094] It can be defined in unlicensed frequency bands such as 5GHz, 2.4GHz, and 900MHz. There are a total of 99 data channels, and the bandwidth is defined according to the specific system capacity. The following takes the 5GHz fr...

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Abstract

A method for realizing coexistence of LTE-LAA system and WiFi system on unauthorized frequency band is disclosed. The method mainly comprises the following steps: on an unauthorized frequency band, the WiFi system normally transmits data, the LTE-LAA system designs a frequency hopping algorithm according to the QoS and a priori knowledge of the data to be transmitted, and uses the frequency hopping algorithm to transmit the data in a frequency hopping manner on a usable channel set. The invention applies frequency hopping technology to LTE-LAA system, a frequency assignment scheme based on frequency hopping technology is provided. By designing a reasonable frequency hopping algorithm, the two systems can coexist harmoniously without using LBT technology, which avoids transmission delay andenhances the spectrum efficiency of the system.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for realizing the coexistence of an LTE-LAA system and a WiFi system in an unlicensed frequency band. Background technique [0002] With the growth of mobile devices and the diversification of mobile applications, wireless carriers are experiencing explosive growth in data traffic. According to industry reports, from 2010 to 2020, the global mobile data traffic will increase by more than 1,000 times. Users' demands are increasing and they pay more attention to experience, especially the reliability and business continuity of mobile communications. Previous telecommunication networks were carried by licensed frequency bands. However, due to the rapid development of network services, the resources of licensed frequency bands are almost exhausted, especially the low-frequency band resources with high utilization value are rapidly consumed by the growing user ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/713H04B1/7136H04B1/715H04W74/08
CPCH04B1/713H04B1/7136H04B1/715H04B2001/7154H04W74/0833
Inventor 徐少毅方锦龙
Owner BEIJING JIAOTONG UNIV
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