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Random access method, random access system, access equipment at network side and terminal

A technology of random access and access equipment, applied in the field of communication, can solve the problems of high probability of selecting the same preamble and reduced probability of terminals correctly accessing the network side access equipment, etc., so as to improve the correct access rate and increase the number of terminals. The number of accesses and the effect of reducing the probability of collision

Active Publication Date: 2012-04-25
CHINA MOBILE COMM GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a random access method, system, network-side access device, and terminal to solve the problem in the prior art that different terminals in the same cell have a high probability of selecting the same preamble, which causes the terminal to correctly access The problem of reducing the probability of accessing devices on the network side

Method used

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  • Random access method, random access system, access equipment at network side and terminal
  • Random access method, random access system, access equipment at network side and terminal
  • Random access method, random access system, access equipment at network side and terminal

Examples

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example 1

[0089] Figure 5 , 6 and 7 represent that when the radius of the cell is 2.5km, 5km and 20km (i.e. the maximum round-trip delay is 16.67μs, 33.33μs and 133.33μs respectively), using the scheme of the present invention and the two-step random access scheme in the prior art to obtain The relationship between the signal-to-noise ratio (SNR) and the collision probability can be seen from the figure, regardless of whether the number of random access users supported in the current cell is 2, 3 or 4, under the same SNR condition, using The collision probability of the scheme of the present invention is obviously lower than that of the two-step random access scheme in the prior art, and the larger the cell radius is, the lower the collision probability obtained by the scheme of the present invention is.

example 2

[0091] Figure 8 and 9 Indicates the number of access terminals that can be supported under the same collision probability obtained by using the scheme of the present invention and the two-step random access scheme in the prior art when the radius of the cell is 5km. exist Figure 8 In the case where the collision probability is lower than 0.3, the method in the prior art can only access one terminal, but in the system using the scheme of the present invention, with the increase of the signal-to-noise ratio, the number of accessible terminals is also reduced by 2 increased to 4. Figure 9 The conclusion is similar when the collision probability is lower than 0.4.

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Abstract

The invention discloses a random access method. The method comprises the following steps: sending access request information by a receiving terminal at a network side, wherein the access request information comprises a lead code and a sub-identifier; according to the lead code and the sub-identifier, identifying the terminal; and when the terminal is successfully identified, accessing the terminal. The method effectively reduces the collision probability, improves the accurate accessing rate of the terminal and increases the access number of the terminals which a cell can support. The invention also discloses a random access system, the terminal and access equipment at the network side.

Description

technical field [0001] The present invention relates to data transmission technology in the communication field, in particular to a random access method, system, network-side access device and terminal. Background technique [0002] The currently extensively researched B3G mobile communication system is a cellular system based on Orthogonal Frequency Division Multiple Access (OFDMA) or Single Carrier Frequency Division Multiple Access (SC-FDMA). A fully synchronized terminal needs to access the base station before uplink data transmission, that is, to perform a random access process for asynchronous terminals, referred to as the random access process. In the random access process, the terminal sends information requesting access to the base station in the random access channel (RACH), which is called RACH burst. From the perspective of time domain, a RACH burst consists of cyclic prefix (CP), preamble , resource request data and protection time. Two random access procedure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04W88/02H04W88/08
Inventor 别志松林家儒韩璐任斌刘光毅黄宇红
Owner CHINA MOBILE COMM GRP CO LTD
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