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Coverage reinforcing system based on radio remote unit and method thereof

A radio frequency remote unit and coverage enhancement technology, which is applied in radio relay systems, active electrical relay systems, radio/inductive link selection arrangements, etc., can solve problems such as increasing system costs and wasting base station capacity, and achieve faster The effect of building site speed, expanding area and reducing cost

Inactive Publication Date: 2008-10-22
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wide-area coverage with low traffic volume, multiple RRU independent cells must be adopted, which wastes the capacity of the base station and increases the system cost

Method used

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  • Coverage reinforcing system based on radio remote unit and method thereof
  • Coverage reinforcing system based on radio remote unit and method thereof
  • Coverage reinforcing system based on radio remote unit and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 2 As shown, the coverage enhancement system based on remote radio units is composed of BBUs connected to RRU1-RRU4, and each of the RRUs covers the same cell 1.

[0032] Such as image 3 Shown is a networking method in which each RRU is connected to a BBU through a star networking method, and the RRUs 201 and 202 are set in parallel and connected to the BBU 200 respectively.

[0033] The working process of the coverage enhancement system based on remote radio units using the above-mentioned star networking method is as follows:

[0034] The BBU200 directly measures the time delay T01 of RRU201 and the time delay T02 of RRU202, compares the time delays of T01 and T02, selects the largest one, and then BBU200 configures the difference between the maximum time delay value and T01 subtraction value to RRU201, the maximum time delay value The difference subtracted from T02 is configured to RRU202. Each RRU compensates the uplink and downlink I / Q signals ac...

Embodiment 2

[0037] Such as Figure 4 As shown, the daisy chain networking method is adopted, and each RRU is connected in sequence and then connected to the BBU.

[0038] The working process of the coverage enhancement system based on the radio remote unit using the above daisy chain networking method is as follows:

[0039] The BBU300 directly measures the time delay TT01 of the RRU301, and the RRU301 directly measures the time delay TT02 from the RRU302 to the RRU301, and reports it to the BBU300.

[0040] The time delay from RRU301 to BBU300 obtained by BBU300 is TT01, and the time delay from RRU302 to BBU300 obtained by BBU300 is TT01+TT02. The delay compensation value of RRU301 is TT02, the delay compensation value of RRU302 is 0, the BBU300 configures the delay compensation value to each RRU, and the RRU compensates the uplink and downlink I / Q signals according to the delay compensation value configured by the BBU.

[0041] In the downlink of the daisy chain, RRUs at all levels re...

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Abstract

The invention provides a coverage enhancement system based on a remote radio unit. The system consists of a BBU and a plurality of RRU, wherein the plurality of RRU of the coverage enhancement system based on the remote radio unit covers the same cell. The coverage enhancement system based on the remote radio unit is a star network system or a daisy chain network system, an air interface of each level RRU transmits the same I / Q data, and compensates time delay of each level RRU at the same time, ensuring the time delays from baseband data of the BBU to an antenna port of each level RRU are approximately same, avoiding time delay dispersion influence of an overlapping area of each level RRU caused by different time delays, improving the cell coverage, and reducing baseband treatment cost of the BBU, thereby coverage demands of a mobile communication network can be better satisfied.

Description

technical field [0001] The invention relates to outdoor coverage technology in the field of wireless communication, in particular to a coverage enhancement system and method based on radio remote units. Background technique [0002] Radio remote units have been widely used in mobile communication systems. The use of radio remote units can solve problems such as difficult site selection of equipment rooms and reduce feeder loss, and improve system efficiency. The remote radio unit improves the flexibility of network construction, reduces the network construction cost and operation cost of operators, and promotes the development of mobile communications. [0003] Currently in the actual network, such as figure 1 As shown, a base station uses four remote radio units (RRUs), namely RRU1, RRU2, RRU3, and RRU4, and each RRU corresponds to an independent cell 1, cell 2, cell 3, and cell 4 in sequence to cover the outdoor area. The downlink transmission signal of each RRU comes f...

Claims

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Application Information

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IPC IPC(8): H04B7/15H04Q7/30
Inventor 罗漫江张远见
Owner COMBA TELECOM SYST CHINA LTD
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