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An uplink random access method and its realization device and method

A random access and link technology, applied in the direction of selection device, radio/induction link selection arrangement, shaping network in transmitter/receiver, etc. problems such as large interference, to achieve the effect of increasing the number of users, reducing interference, and reducing complexity

Inactive Publication Date: 2008-04-23
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The number of users accessed by TDM and FDM cannot be too many, and the interference between multiple cells is relatively large
[0005] (2) Although CDM can resist the interference between multiple cells, the number of access users is not enough

Method used

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  • An uplink random access method and its realization device and method
  • An uplink random access method and its realization device and method
  • An uplink random access method and its realization device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0085] Embodiment 1, the mobile terminal transmitter is used to implement the LTE uplink random access method, see Figure 4 . The mobile terminal transmitter is used to transmit RACH, which consists of RACH signal generator 1, Fourier transform unit 2, subcarrier mapping unit 3, inverse Fourier transform unit 4, parallel / serial conversion unit 5, D / A conversion unit 6, radio frequency transmitting unit 7 and a transmitting antenna 8;

[0086] The working steps of the mobile terminal transmitter are as follows: first, the RACH signal generator 1 generates a signal x ( n ) = exp [ j 2 πl M ( n + n n + 1 2 ) ] , This is t...

Embodiment 2

[0096] Embodiment 2, the base station receiver is used to implement the LTE uplink random access method, see Figure 5 . The base station receiver is used to receive RACH, and consists of a receiving antenna 9, a radio frequency receiving unit 10, an A / D conversion unit 11, a serial / parallel conversion unit 12, a Fourier transform unit 13, a subcarrier demapping unit 14, and K correlators Correlation detection unit 15 and threshold detection decision unit 16 are formed;

[0097] The receiving antenna 9 in the base station receiver receives the transmitted signal, first down-converts the frequency by the radio frequency receiving unit 10, and then performs sampling through the A / D conversion unit 11 to obtain a baseband signal, and obtains N parallel data through the serial / parallel conversion unit 12 Afterwards, the Fourier transform unit transforms 13 to obtain N channels of frequency domain signals, and detects them in the frequency domain. First, according to the subcarri...

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Abstract

The method is applicable to long-term evolution system. The idea of the invention is that combination of time division multiplex (TDM) and frequency division multiplex (FDM) is adopted in RACH design, and combinations of multiple code words are adopted for RACH precursor. Relative to individual FDM, TDM, and CDM (code division multiplexing), technical scheme of the invention can obtain larger number of access users, and reduce interference between multiple users, and multiple sectors, use less number of correlator, and lowers complexity of sequence design.

Description

technical field [0001] The present invention relates to a mobile terminal access technology, in particular to a method for uplink random access in the long-term evolution system of the third-generation mobile communication, and an implementation device and method. Background technique [0002] As we all know, in cellular mobile communication, when a mobile terminal applies for network access, it first sends network access request information to the base station, and then obtains uplink time synchronization and can access the network. In the existing LTE (Long Term Evolution System for Third Generation Mobile Communications) uplink random access methods, there are TDM (Time Division Multiplexing), FDM (Frequency Division Multiplexing), CDM (Code Division Multiplexing) and TDM / FDM several access methods. [0003] The existing LTE uplink random access methods have the following deficiencies: [0004] (1) The number of users accessed by TDM and FDM cannot be too many, and the...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04L27/26H04Q7/32H04J13/00H04W74/08H04L25/03
Inventor 张峻峰
Owner ZTE CORP
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