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
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[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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