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Dual-network common-mode method and system

A common mode, LTE-A technology, applied in the field of communication, can solve the problems of low spectral efficiency, low frequency band cannot be effectively used, and spectral efficiency has no contribution, so as to reduce construction cost and hardware manufacturing cost, work risk and implementation The effect of low difficulty and reducing the number of launch channels

Inactive Publication Date: 2012-10-31
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spectral efficiency of the Code Division Multiplexing (CDM) technology used in the 3G system is lower than that of OFDM, so that a large number of low-frequency bands with excellent wireless performance occupied by the 3G system cannot be effectively utilized.
[0004] The usual common mode solutions focus on reducing construction costs and hardware manufacturing costs, such as: common site, common antenna feeder, common radio frequency (RRU, Radio Remote Unite) and baseband (BBU, Base Band Unite), etc., but for spectral efficiency then no contribution

Method used

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  • Dual-network common-mode method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0043] This embodiment takes CDMA and LTE common mode as an example, where the CDMA system can be WCDMA, CDMA1x, TD-SCDMA, etc. The specific steps are as follows:

[0044] Step 1, determining the CDMA and LTE system frequency band superposition mode;

[0045] Let LTE uplink frequency band ULBW, downlink frequency band DLBW; and CDMA forward link frequency band FLBW, reverse link frequency band RLBW, for TD-SCDMA, FLBW and RLBW are the same frequency band;

[0046] Superimpose FLBW and RLBW on one or two frequency bands of LTE to ensure that FLBW and RLBW do not overlap, attach figure 1 , 2 Two superposition methods are given;

[0047] Step 2, limiting the maximum received PSD of the signal on the frequency band where the LTE and CDMA signals are superimposed;

[0048] Let LTE receive PSD be PSDRxL (unit is dBm), PSD of CDMA system is PSDRxC (unit is dBm), and the signal detection threshold of CDMA system is SINRC (unit is dB), then:

[0049] PSDRxC-PSDRxL-Noise>=SINRC+Inte...

Embodiment 2

[0054] This embodiment takes CDMA and LTE-A common mode as an example, where the CDMA system can be WCDMA, CDMA1x, TD-SCDMA, etc. The specific steps are as follows:

[0055] Step 1, determining the CDMA and LTE-A system frequency band superposition mode;

[0056] Let LTE-A uplink frequency bands ULBW1, ULBW2, ..., ULBWm; downlink frequency bands DLBW1, DLBW2, ..., DLBWn; and CDMA forward link frequency band FLBW, reverse link frequency band RLBW, for TD-SCDMA, FLBW It is the same frequency band as RLBW;

[0057] Superimpose FLBW and RLBW on one or two frequency bands of LTE-A to ensure that FLBW and RLBW do not overlap, image 3 One superposition method is given;

[0058] Step 2, limiting the maximum received PSD of the signal on the frequency band where the LTE-A and CDMA signals are superimposed;

[0059] Let LTE-A receive PSD be PSDRxL (unit is dBm), PSD of CDMA system is PSDRxC (unit is dBm), and the signal detection threshold of CDMA system is SINRC (unit is dB), then:...

Embodiment 3

[0064] This embodiment takes CDMA and LTE / LTE-A common mode as an example, and describes a CDMA and LTE / LTE-A common mode system, as shown in the attached Figure 4 As shown, its composition is described as follows:

[0065] The CDMA and LTE / LTE-A frequency band superposition mode determination unit 401 is used to determine the CDMA and LTE / LTE-A frequency band superposition mode, so as to finally superimpose the CDMA signal on the LTE / LTE-A signal, specifically as follows:

[0066] Let LTE / LTE-A uplink frequency bands ULBW1, ULBW2, ..., ULBWm; downlink frequency bands DLBW1, DLBW2, ..., DLBWn; and CDMA forward link frequency band FLBW, reverse link frequency band RLBW, for TD-SCDMA , FLBW and RLBW are the same frequency band;

[0067] Superimpose FLBW and RLBW on one or two frequency bands of LTE / LTE-A to ensure that FLBW and RLBW do not overlap. Figures 1 to 3 Three superposition methods are given;

[0068] The LTE / LTE-A power control unit 402 is configured to limit the ...

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Abstract

The invention discloses a dual-network common-mode method and system. A CDMA (Code Division Multiple Access) signal is superpositioned on an LTE / LTE / A (Long Term Evolution / Long Term Evolution Advanced) signal; and on a frequency spectrum where the CDMA signal is superpositioned on the LTE / LTE / A signal, the maximum receiving PSD of the LTE / LTE / A signal on the superpositioned resource is limited. The dual-network common-mode technology provided by the invention can realize common carrier frequency of LTE / LTE-A and CDMA, thus radio frequency efficiency and frequency spectrum utilization rate which are occupied by a CDMA network are effectively increased, the problems of low 3G frequency spectrum utilization rate and frequency spectrum resource waste caused by protection intervals among intersystems are effectively solved, the quantity of transmitting channels of RRU (Radio Remote Unit) is reduced, the possibility that the single-channel RRU supports a plurality of networks exists; and the method and system provided by the invention have the function of lowering construction cost and hardware manufacture cost just like other conventional common-mode schemes, and ensure that the working risk and the implementing difficulty of smoothly evoluting 3G to the LTE / LTE-A are reduced to be minimum.

Description

technical field [0001] The invention relates to the communication field, in particular to a dual-network common mode method and system. Background technique [0002] With the development of wireless broadband communication technology and the continuous improvement of user needs, wireless spectrum resources, as a non-renewable resource, have become more and more precious. Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology greatly improves the spectrum efficiency due to its high spectrum efficiency and simple implementation. Currently, both the Long Term Evolution (LTE, Long Term Evolution) system and the LTE-Advanced (LTE-A, LTE Advanced) system use the OFDM technology. [0003] However, Code Division Multiple Access (CDMA) technology is widely used as the basis of 3G systems and will continue to operate for a long time. However, the spectral efficiency of the Code Division Multiplexing (CDM) technology adopted by the 3G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14
CPCH04W88/10H04W16/14
Inventor 张庆宏
Owner ZTE CORP
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