WO2012146021A1 - 双网共模方法与系统 - Google Patents

双网共模方法与系统 Download PDF

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Publication number
WO2012146021A1
WO2012146021A1 PCT/CN2011/081729 CN2011081729W WO2012146021A1 WO 2012146021 A1 WO2012146021 A1 WO 2012146021A1 CN 2011081729 W CN2011081729 W CN 2011081729W WO 2012146021 A1 WO2012146021 A1 WO 2012146021A1
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Prior art keywords
lte
cdma
signal
rlbw
flbw
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PCT/CN2011/081729
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English (en)
French (fr)
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张庆宏
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中兴通讯股份有限公司
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Publication of WO2012146021A1 publication Critical patent/WO2012146021A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • H04W88/10Access point devices adapted for operation in multiple networks, e.g. multi-mode access points

Definitions

  • the present invention relates to the field of communications, and in particular, to a dual network common mode method and system. Background technique
  • Orthogonal Frequency Division Multiplexing greatly improves spectrum efficiency due to its high spectral efficiency and simple implementation.
  • LTE Long Term Evolution
  • LTE-A Advanced LTE
  • LTE Advanced uses OFDM technology.
  • CDMA Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • OFDM orthogonal frequency division multiplexing
  • the main object of the present invention is to provide a dual-network common mode method and system to improve the radio spectrum efficiency and spectrum utilization occupied by a CDMA network.
  • a dual-network common mode method includes: superimposing a code division multiple access CDMA signal on a long-term evolution LTE/Advanced Long Term Evolution (LTE-A) signal; on a spectrum superimposed by CDMA and LTE/LTE-A signals, Limiting the maximum received power spectral density P SD of the LTE/LTE-A signal on the overlapping resources.
  • LTE-A long-term evolution LTE/Advanced Long Term Evolution
  • the process of superimposing a CDMA signal on an LTE/LTE-A signal includes: determining a frequency band superposition manner of the CDMA and LTE/LTE-A systems.
  • the method for determining a CDMA/LTE/LTE-A system band superposition manner is: setting an LTE/LTE-A uplink frequency band ULBW, a downlink frequency band DLBW, and a CDMA forward link frequency band FLBW and a reverse link frequency band RLBW;
  • the FLBW and RLBW are superimposed on one or two frequency bands of LTE/LTE-A, ensuring that the FLBW and the RLBW do not overlap.
  • the process of superimposing the FLBW and the RLBW on one or two frequency bands of the LTE/LTE-A includes: superimposing the FLBW of the CDMA on the DLBW of the LTE/LTE-A, and superimposing the RLBW of the CDMA on the LTE/LTE-A On the ULBW, either superimpose the CDMA RLBW on the LTE/LTE-A DLBW, superimpose the CDMA FLBW on the LTE/LTE-A ULBW, or superimpose the CDMA frequency band on the LTE/LTE-A ULBW. Up, or the frequency band of CDMA is superimposed on the DLBW of LTE/LTE-A.
  • the method for limiting the maximum receiving PSD of the LTE/LTE-A signal on the overlapping resource is: setting the LTE/LTE receiving PSD to PSDRxL, the PSD of the CDMA system to PSDRxC, and the signal detection threshold of the CDMA system to SINRC, then:
  • PSDRxC-PSDRxL-Noise> SINRC+InterferenceMargin;
  • InterferenceMargin is the cell interference margin
  • PSDRxL ⁇ PSDRxC— Noise— SINRC-InterferenceMargin.
  • a dual-network common mode system comprising a CDMA and LTE/LTE-A band superposition method determining unit, and an LTE/LTE-A power control unit;
  • the CDMA and LTE/LTE-A band superposition manner determining unit is configured to superimpose a CDMA signal on an LTE/LTE-A signal;
  • the LTE/LTE-A power control unit is configured to limit the maximum received PSD of the LTE/LTE-A signal on the overlapping resources on the spectrum superimposed by the CDMA and the LTE/LTE-A signals.
  • the CDMA and LTE/LTE-A band superposition manner determining unit is configured to determine a CDMA and LTE/LTE-A system band superposition manner when the CDMA signal is superimposed on the LTE/LTE-A signal.
  • the CDMA and LTE/LTE-A band superposition manner determining unit is configured to: set LTE/LTE-A ULBW, DLBW, and CDMA FLBW when determining a CDMA and LTE/LTE-A system band superposition manner. RLBW; superimposing the FLBW and the RLBW on one or two frequency bands of the LTE/LTE-A, ensuring that the FLBW and the RLBW do not overlap.
  • the CDMA and LTE/LTE-A band superposition manner determining unit is configured to: superimpose the CDMA FLBW on the LTE when the FLBW and the RLBW are superimposed on one or two frequency bands of the LTE/LTE-A.
  • the CDMA frequency band is superimposed on the LTE/LTE-A ULBW
  • the CDMA frequency band is superimposed on the LTE/LTE-A DLBW.
  • the LTE/LTE-A power control unit is configured to: when limiting the maximum received PSD of the LTE/LTE-A signal on the overlapping resources:
  • LTE/LTE receive PSD as PSDRxL
  • CDMA system PSD as PSDRxC
  • CDMA system signal detection threshold is SINRC
  • B'J Let LTE/LTE receive PSD as PSDRxL, CDMA system PSD as PSDRxC, CDMA system signal detection threshold is SINRC, B'J:
  • PSDRxC-PSDRxL-Noise> SINRC+InterferenceMargin;
  • InterferenceMargin is the cell interference margin
  • PSDRxL ⁇ PSDRxC— Noise— SINRC-InterferenceMargin.
  • the dual-network common mode technology of the present invention can implement the LTE/LTE-A and CDMA common carrier frequency, effectively improving the wireless spectrum efficiency and spectrum utilization occupied by the CDMA network, and effectively solving the problem.
  • the problem of wasted spectrum resources caused by low 3G spectrum utilization and protection interval between different systems, and reduces the number of RRU transmission channels, making single-channel RRUs It is possible to support multiple networks, and it also has the effect of reducing construction cost and hardware manufacturing cost in other conventional common mode solutions, and minimizes the operational risk and implementation difficulty of 3G smooth evolution to LTE/LTE-A.
  • TD-SCDMA time division synchronous code division multiple access
  • FIG. 2 is a schematic diagram of a common carrier frequency of WCDMA or CDMA lx and LTE-A common mode according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a common carrier frequency of a CDMA and LTE-A common mode according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a CDMA and LTE-A common mode system according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a dual network common mode process according to an embodiment of the present invention. detailed description
  • the CDMA signal can be superimposed on the LTE/LTE-A signal to realize the cooperation between CDMA and LTE/LTE-A.
  • the carrier frequency design enables the CDMA system and the LTE/LTE-A system to share the same spectrum, improving spectrum efficiency and spectrum utilization, while taking into account the advantages of the conventional common mode method.
  • the CDMA system has high spread spectrum gain and low Signal Interference and Noise Ratio (SINR) threshold, and limits LTE on overlapping resources in the spectrum superimposed on CDMA and LTE/LTE-A signals.
  • SINR Signal Interference and Noise Ratio
  • LTE-A signal Maximum Received Power Spectral Density (PSD) to ensure CDMA system communication.
  • Step one determining a frequency band superposition manner of the CDMA and LTE/LTE-A systems
  • LTE/LTE-A uplink frequency band ULBW1, ULBW2, ULBWm
  • Downlink frequency band DLBW
  • DLBW1 Downlink frequency band
  • DLBW2 Downlink frequency band
  • DLBWn Downlink frequency band
  • FLBW forward link frequency band
  • RLBW reverse link frequency band
  • Step 2 limiting the maximum reception of signals on the frequency band where LTE/LTE-A and CDMA signals are superimposed
  • LTE/LTE receive PSD as PSDRxL (in dBm), CDMA system PSD as PSDRxC (in dBm), and CDMA system signal detection threshold as SINRC (in dB), then:
  • PSDRxC-PSDRxL-Noise> SINRC+InterferenceMargin;
  • InterferenceMargin is the cell interference margin and belongs to the existing wireless system.
  • PSDRxL ⁇ PSDRxC— Noise— SINRC-InterferenceMargin.
  • CDMA and LTE common mode as an example.
  • the CDMA system may be WCDMA, CDMAlx, TD-SCDMA, etc.
  • the specific steps are as follows:
  • Step one determining a frequency band superposition mode of the CDMA and LTE systems
  • 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;
  • Figures 1 and 2 show two superposition methods
  • Step 2 limiting the maximum receiving PSD of the signal on the frequency band where the LTE and CDMA signals are superimposed;
  • LTE receive PSD as PSDRxL (in dBm)
  • CDMA system PSD as PSDRxC (in dBm)
  • CDMA system signal detection threshold as SINRC (in dB)
  • PSDRxC-PSDRxL-Noise> SINRC+InterferenceMargin;
  • InterferenceMargin is the cell interference margin and belongs to the existing wireless system.
  • PSDRxL ⁇ PSDRxC— Noise— SINRC-InterferenceMargin.
  • the preferred superposition method is to superimpose the CDMA FLBW on
  • the RLBW of CDMA is superimposed on the ULBW of LTE/LTE-A, or the frequency band of CDMA is superimposed on the ULBW of LTE/LTE-A (because the load of LTE UL is generally lower than DL , its UL has a power control mechanism).
  • CDMA and LTE-A common mode as an example.
  • the CDMA system may be WCDMA, CDMA lx, TD-SCDMA, etc.
  • the specific steps are as follows:
  • Step one determining a frequency band superposition manner of the CDMA and LTE-A systems
  • 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 One frequency band;
  • Figure 3 shows a superposition method
  • Step 2 Limiting the maximum received PSD of the signal on the frequency band where the LTE-A and the CDMA signal are superimposed; setting the LTE-A receiving PSD to PSDRxL (in dBm), and the PSD of the CDMA system to PSDRxC (in dBm), the signal of the CDMA system
  • the detection threshold is SINRC (in dB)
  • PSDRxC-PSDRxL-Noise> SINRC+InterferenceMargin;
  • InterferenceMargin is the cell interference margin, which belongs to the existing wireless system.
  • PSDRxL ⁇ PSDRxC— Noise— SINRC-InterferenceMargin.
  • This embodiment uses CDMA and LTE/LTE-A common mode as an example to describe a CDMA and
  • the LTE/LTE-A common mode system as shown in Figure 4, is described as follows:
  • the CDMA and LTE/LTE-A band superposition manner determining unit 401 is configured to determine a CDMA and LTE/LTE-A band superposition manner to finally superimpose the CDMA signal on the LTE/LTE-A signal, as follows:
  • DLBW1, DLBW2, DLBWn; and CDMA forward link band FLBW, reverse link band RLBW, for TD-SCDMA, FLBW and RLBW are the same band; FLBW and RLBW are superimposed on one or two of LTE/LTE-A Bands, ensuring that FLBW and RLBW do not overlap, Figures 1 to 3 show three superposition methods;
  • the LTE/LTE-A power control unit 402 is configured to limit the maximum receiving PSD of the LTE/LTE-A signal on the overlapping resources on the spectrum superimposed by the CDMA and the LTE/LTE-A signals. Specifically: Let LTE/LTE receive PSD as PSDRxL (in dBm), CDMA system PSD as PSDRxC (in dBm), and CDMA system signal detection threshold as SINRC (in dB), then:
  • PSDRxC-PSDRxL-Noise> SINRC+InterferenceMargin;
  • InterferenceMargin is the cell interference margin and belongs to the existing wireless system.
  • PSDRxL ⁇ PSDRxC— Noise— SINRC-InterferenceMargin.
  • the radio resource control (RRC) function entity of the LTE/LTE-A embeds the GSM band determined by the CDMA and LTE/LTE-A band superposition manner determining unit 401. Location, configure the frequency domain location of the relevant radio channel to avoid inter-system interference caused by the overlap of LTE/LTE-A and GSM bands.
  • RRC radio resource control
  • the dual-network common mode operation of the present invention can represent the process shown in FIG. 5, and the process includes the following steps:
  • Step 510 Superimpose the CDMA signal on the LTE/LTE-A signal.
  • Step 520 Limit the maximum receiving PSD of the LTE/LTE-A signal on the overlapping resources on the spectrum superimposed by the CDMA and LTE/LTE-A signals.
  • step 510 there is no chronological order between step 510 and step 520, and any step may be performed first, or two steps may be performed simultaneously.
  • the dual-network common mode technology of the present invention can implement the LTE/LTE-A and CDMA common carrier frequency, effectively improving the wireless spectrum efficiency and spectrum utilization occupied by the CDMA network, and effectively solving the problem.
  • the problem of waste of spectrum resources caused by low 3G spectrum utilization and protection interval between different systems, while reducing the number of RRU transmission channels, makes it possible to support multiple networks with single-channel RRUs, and has other conventional common mode solutions. It reduces the construction cost and hardware manufacturing cost, and minimizes the work risk and implementation difficulty of 3G smooth evolution to LTE/LTE-A.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明公开了一种双网共模方法和系统,将CDMA信号叠加在LTE/LTE-A信号上;并在CDMA与LTE/LTE-A信号叠加的频谱上,限制重叠资源上的LTE/LTE-A信号最大接收PSD。本发明的双网共模技术能实现LTE/LTE-A与CDMA共载频,有效提高了CDMA网络占用的无线频谱效率和频谱利用率,有效解决了3G频谱利用率低和异系统间的保护间隔带来的频谱资源浪费问题,同时减少了RRU的发射通道数,使得用单通道RRU支持多个网络成为可能,同时还具有其他常规共模方案中降低施工成本和硬件制造成本的作用,并使得3G平滑演进到LTE/LTE-A的工作风险和实施难度降到最低。

Description

双网共模方法与系统 技术领域
本发明涉及通信领域, 具体涉及双网共模方法与系统。 背景技术
随着无线宽带通信技术的发展与用户需求的不断提高, 无线频谱资源 作为一种不可再生资源, 已经越发珍贵。正交频分复用(OFDM, Orthogonal Frequency Division Multiplexing )技术以其频谱效率高和实现简单的特点, 极大地提高了频谱效率。 目前, 长期演进( LTE, Long Term Evolution ) 系 统和高级 LTE ( LTE-A, LTE Advanced ) 系统均采用了 OFDM技术。
然而, 码分多址(CDMA )技术作为 3G系统的基础而被广泛采用, 还 将长期运行。 而 3G 系统所采用的码分复用 (CDM )技术的频谱效率低于 OFDM,从而使得被 3G系统所占用的大量无线性能优良的低频频带无法被 有效利用。
通常的共模方案都专注于降低施工成本和硬件制造成本, 如: 共站址、 共天馈、共射频( RRU, Radio Remote Unite )和基带( BBU, Base Band Unite ) 等, 但对于频谱效率则没有任何贡献。 发明内容
有鉴于此, 本发明的主要目的在于提供一种双网共模方法与系统, 以 提高 CDMA网络占用的无线频谱效率和频谱利用率。
为达到上述目的, 本发明的技术方案是这样实现的:
一种双网共模方法,包括:将码分多址 CDMA信号叠加在长期演进 LTE/ 高级长期演进 LTE-A信号上;在 CDMA与 LTE/LTE-A信号叠加的频谱上, 限制重叠资源上的 LTE/LTE-A信号最大接收功率谱密度 P SD。
其中, 所述将 CDMA信号叠加在 LTE/LTE-A信号上的过程, 包括: 确 定 CDMA与 LTE/LTE-A系统频带叠加方式。
其中,所述确定 CDMA与 LTE/LTE-A系统频带叠加方式的方法为:设 LTE/LTE-A上行频带 ULBW、 下行频带 DLBW, 以及 CDMA 正向链路 频带 FLBW、 反向链路频带 RLBW; 将所述 FLBW 和 RLBW 叠加在 LTE/LTE-A的一个或二个频带上, 确保 FLBW与 RLBW不重叠。
将所述 FLBW和 RLBW叠加在 LTE/LTE-A的一个或二个频带上的过 程包括: 将 CDMA的 FLBW叠加在 LTE/LTE-A的 DLBW上, 将 CDMA 的 RLBW叠加在 LTE/LTE-A的 ULBW上, 或者将 CDMA的 RLBW叠加 在 LTE/LTE-A的 DLBW上,将 CDMA的 FLBW叠加在 LTE/LTE-A的 ULBW 上,或者将 CDMA的频带都叠加在 LTE/LTE-A的 ULBW上,或者将 CDMA 的频带都叠加在 LTE/LTE-A的 DLBW上。
其中,所述限制重叠资源上的 LTE/LTE-A信号最大接收 PSD的方法为: 设 LTE/LTE接收 PSD为 PSDRxL, CDMA系统的 PSD为 PSDRxC, CDMA系统的信号检测门限为 SINRC, 则:
PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;
其中 InterferenceMargin为小区干扰余量;
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
一种双网共模系统 ,包括 CDMA与 LTE/LTE-A频带叠加方式确定单元、 LTE/LTE-A功率控制单元; 其中,
所述 CDMA与 LTE/LTE-A频带叠加方式确定单元, 用于将 CDMA信 号叠加在 LTE/LTE-A信号上;
所述 LTE/LTE-A功率控制单元, 用于在 CDMA与 LTE/LTE-A信号叠 加的频谱上, 限制重叠资源上的 LTE/LTE-A信号最大接收 PSD。 其中 ,所述 CDMA与 LTE/LTE-A频带叠加方式确定单元,在将 CDMA 信号叠加在 LTE/LTE-A信号上时, 用于确定 CDMA与 LTE/LTE-A系统频 带叠加方式。
其中, 所述 CDMA 与 LTE/LTE-A 频带叠加方式确定单元, 在确定 CDMA与 LTE/LTE-A系统频带叠加方式时,用于:设 LTE/LTE-A的 ULBW、 DLBW, 以及 CDMA的 FLBW、 RLBW; 将所述 FLBW和 RLBW叠加在 LTE/LTE-A的一个或二个频带上, 确保 FLBW与 RLBW不重叠。
其中, 所述 CDMA与 LTE/LTE-A频带叠加方式确定单元, 在将所述 FLBW和 RLBW叠加在 LTE/LTE-A的一个或二个频带上时,用于:将 CDMA 的 FLBW叠加在 LTE/LTE-A的 DLBW上, 将 CDMA的 RLBW叠加在 LTE/LTE-A的 ULBW上, 或者将 CDMA的 RLBW叠加在 LTE/LTE-A的 DLBW上, 将 CDMA的 FLBW叠加在 LTE/LTE-A的 ULBW上, 或者将 CDMA的频带都叠加在 LTE/LTE-A的 ULBW上, 或者将 CDMA的频带都 叠加在 LTE/LTE-A的 DLBW上。
其中,所述 LTE/LTE-A功率控制单元 ,在限制重叠资源上的 LTE/LTE-A 信号最大接收 PSD时, 用于:
设 LTE/LTE接收 PSD为 PSDRxL, CDMA系统的 PSD为 PSDRxC, CDMA系统的信号检测门限为 SINRC, 贝' J :
PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;
其中 InterferenceMargin为小区干扰余量;
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
综上所述可见, 无论是方法还是系统, 本发明的双网共模技术能实现 LTE/LTE-A与 CDMA共载频, 有效提高了 CDMA网络占用的无线频谱效 率和频谱利用率,有效解决了 3G频谱利用率低和异系统间的保护间隔带来 的频谱资源浪费问题, 同时减少了 RRU的发射通道数,使得用单通道 RRU 支持多个网络成为可能, 同时还具有其他常规共模方案中降低施工成本和 硬件制造成本的作用, 并使得 3G平滑演进到 LTE/LTE-A的工作风险和实 施难度降到最低。 附图说明
图 1为本发明实施例的时分同步码分多址(TD-SCDMA )与 LTE共模 的共载频示意图;
图 2为本发明实施例的 WCDMA或 CDMA lx与 LTE-A共模的共载频 示意图;
图 3为本发明实施例的 CDMA与 LTE-A共模的共载频示意图; 图 4为本发明实施例的 CDMA与 LTE-A共模系统示意图;
图 5为本发明实施例的双网共模流程简图。 具体实施方式
为了提高 CDMA网络占用的无线频谱的使用效率, 降低多网络同覆盖 情况下的硬件开销和施工成本,可以将 CDMA信号叠加在 LTE/LTE-A信号 上, 实现 CDMA 与 LTE/LTE-A 的共载频设计, 使得 CDMA 系统和 LTE/LTE-A 系统可以共用相同的频谱, 提高了频谱效率和频谱利用率, 同 时兼顾了常规共模方法的优点。 并且, 利用 CDMA系统扩频增益高、 信号 检测信干噪比( SINR, Signal Interference and Noise ratio ) 门限低的特点, 在 CDMA与 LTE/LTE-A信号叠加的频谱上,限制重叠资源上的 LTE/LTE-A 信号最大接收功率谱密度(PSD, Power Spectrum Density ), 以保证 CDMA 系统能够正常通信。
具体而言, 可以执行如下步驟:
步驟一, 确定 CDMA与 LTE/LTE-A系统频带叠加方式;
设 LTE/LTE-A上行频带 (ULBW ) ULBW1 , ULBW2, ULBWm; 下行频带 (DLBW ) DLBW1 , DLBW2, · · · , DLBWn; 以及 CDMA 正 向链路频带(FLBW ),反向链路频带(RLBW ),对于 TD-SCDMA , FLBW 与 RLBW为同一个频带;
将 FLBW和 RLBW 叠加在 LTE/LTE-A 的一个或二个频带上, 确保 FLBW与 RLBW不重叠, 附图 1至 3给出了 3种叠加方式;
步驟二,限制 LTE/LTE-A与 CDMA信号叠加处频带上的信号最大接收
PSD;
设 LTE/LTE接收 PSD为 PSDRxL (单位为 dBm ), CDMA系统的 PSD 为 PSDRxC (单位为 dBm ), CDMA系统的信号检测门限为 SINRC (单位 为 dB ), 则:
PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;
其中 InterferenceMargin为小区干扰余量, 属于现有无线系统中既有参 数。
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
下面结合附图和实施例对本发明进行描述。
实施例一,
本实施例以 CDMA 和 LTE 共模为例, 此处 CDMA 系统可以是 WCDMA、 CDMAlx、 TD-SCDMA等, 具体步驟介绍如下:
步驟一, 确定 CDMA与 LTE系统频带叠加方式;
设 LTE上行频带 ULBW, 下行频带 DLBW; 以及 CDMA正向链路频 带 FLBW, 反向链路频带 RLBW, 对于 TD-SCDMA , FLBW与 RLBW为 同一个频带;
将 FLBW和 RLBW叠加在 LTE的一个或二个频带上, 确保 FLBW与 RLBW不重叠, 附图 1、 2给出了 2种叠加方式;
步驟二, 限制 LTE与 CDMA信号叠加处频带上的信号最大接收 PSD; 设 LTE接收 PSD为 PSDRxL (单位为 dBm ), CDMA系统的 PSD为 PSDRxC (单位为 dBm ), CDMA 系统的信号检测门限为 SINRC (单位为 dB ), 则:
PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;
其中 InterferenceMargin为小区干扰余量, 属于现有无线系统中既有参 数。
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
需要说明的是, 优选的叠加方式还是将 CDMA 的 FLBW 叠加在
LTE/LTE-A的 DLBW上,将 CDMA的 RLBW叠加在 LTE/LTE-A的 ULBW 上,或者将 CDMA的频带都叠加在 LTE/LTE-A的 ULBW上(因为 LTE UL 的负载一般低于 DL, 其 UL有功率控制机制 )。
实施例二,
本实施例以 CDMA 和 LTE-A共模为例, 此处 CDMA 系统可以是 WCDMA、 CDMAlx、 TD-SCDMA等, 具体步驟介绍如下:
步驟一, 确定 CDMA与 LTE-A系统频带叠加方式;
设 LTE-A上行频带 ULBW1 , ULBW2 , ... , ULBWm;下行频带 DLBW1 , DLBW2, DLBWn; 以及 CDMA正向链路频带 FLBW, 反向链路频带 RLBW, 对于 TD-SCDMA, FLBW与 RLBW为同一个频带;
将 FLBW和 RLBW叠加在 LTE-A的一个或二个频带上, 确保 FLBW 与 RLBW不重叠, 图 3给出了 1种叠加方式;
步驟二,限制 LTE-A与 CDMA信号叠加处频带上的信号最大接收 PSD; 设 LTE-A接收 PSD为 PSDRxL (单位为 dBm ), CDMA系统的 PSD为 PSDRxC (单位为 dBm ), CDMA 系统的信号检测门限为 SINRC (单位为 dB ), 则:
PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin; 其中 InterferenceMargin为小区干扰余量, 属于现有无线系统中既有参 数。
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
实施例三
本实施例以 CDMA和 LTE/LTE-A共模为例, 描述了一种 CDMA与
LTE/LTE-A共模系统, 如附图 4所示, 其组成描述如下:
CDMA与 LTE/LTE-A频带叠加方式确定单元 401 ,用于确定 CDMA与 LTE/LTE-A频带叠加方式,以最终将 CDMA信号叠加在 LTE/LTE-A信号上, 具体说明如下:
设 LTE/LTE-A上行频带 ULBW1 , ULBW2, ULBWm; 下行频带
DLBW1 , DLBW2, DLBWn; 以及 CDMA正向链路频带 FLBW, 反向 链路频带 RLBW, 对于 TD-SCDMA, FLBW与 RLBW为同一个频带; 将 FLBW和 RLBW叠加在 LTE/LTE-A的一个或二个频带 ,确保 FLBW 与 RLBW不重叠, 附图 1至 3给出了 3种叠加方式;
LTE/LTE-A功率控制单元 402,用于在 CDMA与 LTE/LTE-A信号叠加 的频谱上, 限制重叠资源上的 LTE/LTE-A信号最大接收 PSD。 具体而言: 设 LTE/LTE接收 PSD为 PSDRxL (单位为 dBm ), CDMA系统的 PSD 为 PSDRxC (单位为 dBm ), CDMA系统的信号检测门限为 SINRC (单位 为 dB ), 则:
PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;
其中 InterferenceMargin为小区干扰余量, 属于现有无线系统中既有参 数。
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
在实际应用时, LTE/LTE-A 的无线资源控制 (RRC ) 功能实体根据 CDMA与 LTE/LTE-A频带叠加方式确定单元 401所确定的 GSM频带嵌入 位置, 配置相关无线信道的频域位置, 避免 LTE/LTE-A与 GSM频带重叠 而造成系统间干扰。
结合以上各实施例可见, 本发明的双网共模操作思路可以表示如图 5 所示的流程, 该流程包括以下步驟:
步驟 510: 将 CDMA信号叠加在 LTE/LTE-A信号上。
步驟 520: 在 CDMA与 LTE/LTE-A信号叠加的频谱上, 限制重叠资源 上的 LTE/LTE-A信号最大接收 PSD。
需要说明的是, 步驟 510与步驟 520之间不存在时间先后顺序, 其中 任一步驟可以首先进行, 或者两个步驟同时进行。
综上所述可见, 无论是方法还是系统, 本发明的双网共模技术能实现 LTE/LTE-A与 CDMA共载频, 有效提高了 CDMA网络占用的无线频谱效 率和频谱利用率,有效解决了 3G频谱利用率低和异系统间的保护间隔带来 的频谱资源浪费问题, 同时减少了 RRU的发射通道数,使得用单通道 RRU 支持多个网络成为可能, 同时还具有其他常规共模方案中降低施工成本和 硬件制造成本的作用, 并使得 3G平滑演进到 LTE/LTE-A的工作风险和实 施难度降到最低。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种双网共模方法, 包括:
将码分多址 CDMA信号叠加在长期演进 LTE/高级长期演进 LTE-A信 号上; 在 CDMA 与 LTE/LTE-A信号叠加的频谱上, 限制重叠资源上的 LTE/LTE-A信号最大接收功率谱密度 PSD。
2、 根据权利要求 1 所述的方法, 其中, 所述将 CDMA信号叠加在 LTE/LTE-A信号上的过程, 包括:确定 CDMA与 LTE/LTE-A系统频带叠加 方式。
3、根据权利要求 2所述的方法,其中,所述确定 CDMA与 LTE/LTE-A 系统频带叠加方式的方法为:
设 LTE/LTE-A上行频带 ULBW、 下行频带 DLBW, 以及 CDMA 正 向链路频带 FLBW、 反向链路频带 RLBW;
将所述 FLBW和 RLBW叠加在 LTE/LTE-A的一个或二个频带上, 确 保 FLBW与 RLBW不重叠。
4、 根据权利要求 3所述的方法, 其中, 将所述 FLBW和 RLBW叠加 在 LTE/LTE-A的一个或二个频带上的过程包括:
将 CDMA的 FLBW叠加在 LTE/LTE-A的 DLBW上,将 CDMA的 RLBW 叠加在 LTE/LTE-A的 ULBW上,或者将 CDMA的 RLBW叠加在 LTE/LTE-A 的 DLBW上, 将 CDMA的 FLBW叠加在 LTE/LTE-A的 ULBW上, 或者 将 CDMA的频带都叠加在 LTE/LTE-A的 ULBW上,或者将 CDMA的频带 都叠加在 LTE/LTE-A的 DLBW上。
5、 根据权利要求 1至 4任一项所述的方法, 其中, 所述限制重叠资源 上的 LTE/LTE-A信号最大接收 PSD的方法为:
设 LTE/LTE接收 PSD为 PSDRxL, CDMA系统的 PSD为 PSDRxC, CDMA系统的信号检测门限为 SINRC, 贝' J : PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;
其中 InterferenceMargin为小区干扰余量;
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
6、 一种双网共模系统, 包括 CDMA与 LTE/LTE-A频带叠加方式确定 单元、 LTE/LTE-A功率控制单元; 其中,
所述 CDMA与 LTE/LTE-A频带叠加方式确定单元, 用于将 CDMA信 号叠加在 LTE/LTE-A信号上;
所述 LTE/LTE-A功率控制单元, 用于在 CDMA与 LTE/LTE-A信号叠 加的频谱上, 限制重叠资源上的 LTE/LTE-A信号最大接收 PSD。
7、 根据权利要求 6所述的系统, 其中, 所述 CDMA与 LTE/LTE-A频 带叠加方式确定单元,在将 CDMA信号叠加在 LTE/LTE-A信号上时, 用于 确定 CDMA与 LTE/LTE-A系统频带叠加方式。
8、 根据权利要求 7所述的系统, 其中, 所述 CDMA与 LTE/LTE-A频 带叠加方式确定单元 , 在确定 CDMA与 LTE/LTE-A系统频带叠加方式时 , 用于:
设 LTE/LTE-A的 ULBW、 DLBW, 以及 CDMA的 FLBW、 RLBW; 将所述 FLBW和 RLBW叠加在 LTE/LTE-A的一个或二个频带上, 确 保 FLBW与 RLBW不重叠。
9、 根据权利要求 8所述的系统, 其中, 所述 CDMA与 LTE/LTE-A频 带叠加方式确定单元, 在将所述 FLBW和 RLBW叠加在 LTE/LTE-A的一 个或二个频带上时, 用于:
将 CDMA的 FLBW叠加在 LTE/LTE-A的 DLBW上,将 CDMA的 RLBW 叠加在 LTE/LTE-A的 ULBW上,或者将 CDMA的 RLBW叠加在 LTE/LTE-A 的 DLBW上, 将 CDMA的 FLBW叠加在 LTE/LTE-A的 ULBW上, 或者 将 CDMA的频带都叠加在 LTE/LTE-A的 ULBW上,或者将 CDMA的频带 都叠加在 LTE/LTE-A的 DLBW上。
10、 根据权利要求 6至 9任一项所述的系统, 其中, 所述 LTE/LTE-A 功率控制单元, 在限制重叠资源上的 LTE/LTE-A信号最大接收 PSD时, 用 于:
设 LTE/LTE接收 PSD为 PSDRxL, CDMA系统的 PSD为 PSDRxC, CDMA系统的信号检测门限为 SINRC, 则:
PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;
其中 InterferenceMargin为小区干扰余量;
即: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin。
PCT/CN2011/081729 2011-04-25 2011-11-03 双网共模方法与系统 WO2012146021A1 (zh)

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CN1210405A (zh) * 1997-07-14 1999-03-10 三菱电机株式会社 移动通信系统
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