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Method and system for random switch-in of user equipment

A technology of random access and user equipment, applied in the direction of code division multiplexing system, access restriction, multiplexing communication, etc., can solve the problems of not taking into account, low positioning accuracy, etc., to improve flexible control, Ensure positioning accuracy and increase the effect of access radius

Inactive Publication Date: 2009-02-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this solution, the area with dense Node B is not considered, that is, the UE that is relatively close to the Node B has high requirements for TOA positioning accuracy, so there is a defect of low positioning accuracy

Method used

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  • Method and system for random switch-in of user equipment
  • Method and system for random switch-in of user equipment
  • Method and system for random switch-in of user equipment

Examples

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Embodiment 1

[0043] see figure 2 , figure 2 It is a flowchart of a random access method of UE in the first embodiment of the present invention. In this embodiment, a distance threshold is set in advance for the distance between the UE and the Node B, and for UEs whose distance is greater than the distance threshold, the chip increase rate is set to a high value. The purpose of setting a high value is to make the propagation Delayed cells can carry information at a greater distance, thereby increasing the access radius; for UEs whose distance is less than or equal to the distance threshold, set the chip increase rate to a low increase value. The purpose of setting a low increase value is to ensure In order to achieve compatibility with the existing densely distributed Node Bs, the TOA positioning accuracy of the short-distance UE may not be set to a low increment value, and the chip increment rate of 3 in the prior art is still used. The relationship among the distance threshold value, ...

Embodiment 2

[0064] see image 3 , image 3 It is a flowchart of a random access method of UE in the second embodiment of the present invention. In this embodiment, taking the case where the access radius is 200 kilometers as an example, a distance threshold is set in advance for the distance between UE and Node B, and the distance threshold is set to 300 chip lengths. Compatible with the Node B, in this embodiment, the chip increase rate is not set to a low increase value, but the measurement value in the prior art is used. Every increase of 1 unit represents an increase of 3 chip lengths, that is, the chip increase rate is 3 , then the cell unit of the propagation delay cell corresponding to the length of 300 chips, that is, Pd0 is: 300÷3=100, then according to the relational expression: Pd0×3×78 meters+((2 8 -1)-Pd0) × high value added × 78 meters = the access radius to be achieved, there are 100 × 3 × 78 meters + (255-100) × high value increased × 78 meters = 200 kilometers, you can ...

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Abstract

The invention discloses a method of UE random access, which presets a distance threshold value between the UE and the base station NodeB, and presets high increase value on the code increase rate. Said method comprises: NodeB measures the distance with present UE, when the obtained distance value is larger than the distance threshold value, based on the high increase value, calculates out the transmission delay Pd and sends it to RNC; RNC receives the Pd value of NodeB; based on said high increase value, fixes the distance range between present UE and the NodeB that reporting said Pd value. And the invention also discloses a relative system, which comprise NodeB and RNC. The invention can increase the access radius, and confirm the position accuracy on UE near the NodeB.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a method and system for random access of user equipment (UE, UserEquipment). Background technique [0002] In the initial protocol formulation of Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), the maximum radius of the cell is set to 60 kilometers, that is, the coverage of the base station (Node B) in the WCDMA system can only reach a maximum radius of The range of 60 kilometers, therefore, can only complete WCDMA system access for UEs within 60 kilometers. However, in the actual application of WCDMA, some occasions require a larger access radius, for example, 200 kilometers. At this time, it is necessary to complete access to UEs within 200 kilometers. However, the length of the Propagation Delay (PD, Propagation Delay) cell, which is one of the cells used to complete the access, is 8 bits (bits) in total, 2 bits in total. 8 -1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/38H04Q7/34H04B7/26H04Q7/32H04J13/00H04W48/04H04W74/08
Inventor 聂际敏
Owner HUAWEI TECH CO LTD
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