A Beam Scanning Method for Designing Beam Width by Multiple Sub-beam Superposition

A technology of beam width and beam scanning, which is applied in wireless communication, diversity/multi-antenna system, space transmit diversity, etc., can solve the problem of not being able to ensure that the user and the system can quickly establish a link connection, increase the cell search delay, and reduce the system capacity etc. to reduce cell search delays, solve coverage gap problems, and reduce overhead

Active Publication Date: 2021-04-20
XI AN JIAOTONG UNIV
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Problems solved by technology

Therefore, there is still a certain coverage gap between initial user discovery and data transmission, which will prolong the waiting time for users to access the network. Links are built, and the system capacity decreases accordingly

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  • A Beam Scanning Method for Designing Beam Width by Multiple Sub-beam Superposition
  • A Beam Scanning Method for Designing Beam Width by Multiple Sub-beam Superposition
  • A Beam Scanning Method for Designing Beam Width by Multiple Sub-beam Superposition

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Embodiment Construction

[0048] A kind of beam scanning method of the present invention designs the beam width by superposition of a plurality of sub-beams, comprises the following steps:

[0049] S1. When the base station broadcasts the pilot signal in the cell discovery stage, establish expressions for the cell search delay and the minimum number of scanning beams, and cover the entire area through K times of beam scanning;

[0050] Assume that a frame duration T includes a cell discovery phase τ and a data transmission phase T-τ, where 0figure 2 shown. Here, τ represents the cell search delay. During the cell discovery phase, the base station broadcasts a pilot signal, such as a search beam for a time T s , and the time to monitor user response is T p -T s , alternately for K times, where the pilot signal ratio is defined as

[0051] The cell search delay τ is then expressed as a function of K (i.e., search time or number of search beams) as:

[0052] τ=KT p =KT s / η (1)

[0053] because ...

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Abstract

The invention discloses a beam scanning method for designing the beam width through the superposition of multiple sub-beams. When the base station broadcasts the pilot signal in the cell discovery stage, the expressions for the cell search delay and the minimum number of scanning beams are established, and the entire beam scan is covered by K times. area; using a one-dimensional uniform linear array, the N T An array antenna is divided into M sub-arrays, a sub-array model is established, and the total array response is given, the relationship between the number of sub-arrays M and the minimum number of scanning beams K is analyzed, and the direction of each sub-beam is adjusted to realize flexible beam width scanning; Analyze the relationship between the beamforming gain and the number of array antennas in the desired coverage area, design and optimize the number K of beams with flexible widths to maximize system capacity. The invention optimizes the number of beams scanned with flexible width, reduces the cost of user discovery by designing the number of optimal flexible width beams, greatly improves the system capacity, and solves the problem of coverage gap between user discovery and data transmission.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a beam scanning method for designing a beam width by superposition of multiple sub-beams. Background technique [0002] With the rapid development of modern society, the number of new multimedia services and intelligent terminals continues to increase, which makes mobile communication systems have higher and higher requirements for system capacity, data rate and other aspects. The target capacity index of 5G requires a peak value of 20Gbit / s, and the traditional way of improving spectral efficiency is no longer enough to meet such a high capacity demand. Now the frequency band below 3GHz is already congested, so millimeter wave has become a hot spot for people to pay attention to. , the millimeter wave with abundant spectrum resources greatly relieves the pressure on spectrum resources in current mobile communications. However, compared with traditiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B7/06H04W48/16
CPCH04B7/0413H04B7/0617H04B7/0695H04W48/16
Inventor 范建存刘雪莹许睿罗新民
Owner XI AN JIAOTONG UNIV
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