WO2012146027A1

WO2012146027A1 - Multi-network common mode method and system

Info

Publication number: WO2012146027A1
Application number: PCT/CN2011/082901
Authority: WO
Inventors: 张庆宏
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-04-25
Filing date: 2011-11-24
Publication date: 2012-11-01
Also published as: CN102761877B; CN102761877A

Abstract

Disclosed in the present invention are a multi-network common mode method and system. The method comprises: embedding a Global System for Mobile Communication (GSM) frequency band in a Long Term Evolution/Long Term Evolution-Advanced (LTE/LTE-A) bandwidth as a sub-band of the LTE/LTE-A system (510); directly superimposing a Code Division Multiple Access (CDMA) signal on the frequency band of the GSM and LTE/LTE-A systems (520). The present invention allows LTE/LTE-A, GSM and CDMA to network on the same frequency and utilizes a single-channel common frequency RRU to support multiple networks simultaneously, thereby reducing RRU design and manufacturing costs and solving the problem of spectrum resource waste resulting from low utilization of the GSM and CDMA spectrums and from guard intervals between different systems. The invention also reduces hardware costs and engineering costs in other conventional common mode schemes, minimizing risk and implementation difficulties of a smooth evolution from a third generation (3G) mobile communication system to an LTE/LTE-A system.

Description

Multi-network common mode method and system

The present invention relates to the field of communications, and in particular to a multi-network common mode method and system. Background technique

With the development of wireless broadband communication technology and the continuous improvement of user demand, wireless spectrum resources have become more and more precious as a non-renewable resource. Orthogonal Frequency Division Multiplexing (OFDM) technology greatly improves spectrum efficiency due to its high spectral efficiency and simple implementation. Currently, LTE (Long Term Evolution) systems and Advanced LTE (LTE-A, LTE Advanced) systems use OFDM technology.

However, the Global System for Mobile Communications (GSM) system will also operate for a long time. The frequency efficiency of Frequency Division Multiplexing (FDM) and Time Division Multiplexing (TDM) adopted by the GSM system is far lower than that of OFDM, so that a large number of low-frequency bands with excellent wireless performance cannot be effectively utilized; The spectral efficiency of Code Division Multiple Access (CDMA) technology is also not compatible with OFDM. In order to realize the smooth evolution of wireless communication technology and save hardware cost and engineering cost, common mode technology has become a hot spot for evolution.

It can be seen that since the GSM network and the CDMA network will exist for a long time, a large number of wireless spectrum resources with excellent wireless performance cannot be fully and effectively utilized, and the introduction of the new generation wireless communication technology LTE/LTE-A cannot improve the spectrum efficiency of these bands. In order to avoid inter-system interference, the inter-system protection interval introduced will also cause further waste of spectrum resources.

Common common mode solutions focus on reducing construction costs and hardware manufacturing costs, such as: co-site, total antenna, radio remote unit (RRU) and baseband (BBU), but for spectrum efficiency. There is no contribution. Summary of the invention

In view of this, the main object of the present invention is to provide a multi-network common mode method and system to solve the problem of waste of spectrum resources caused by low spectrum utilization of GSM and CDMA and guard interval between different systems.

In order to solve the above problems, the technical solution of the present invention is implemented as follows:

A multi-network common mode method, including:

The GSM band is used as a sub-band of LTE/LTE-A and embedded in the system bandwidth of LTE/LTE-A; the CDMA signal is directly superimposed on the GSM and LTE/LTE-A bands.

The process of embedding GSM as a sub-band of LTE/LTE-A into an LTE/LTE-A system includes:

Determining a location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system, and embedding the GSM bandwidth as a sub-band in the determined location; wherein, when embedding the GSM bandwidth, avoiding the bandwidth of the LTE/LTE-A system Static pilot and static physical channel;

The static means that: the frequency domain position of the pilot or physical channel cannot be changed.

Wherein, the method for determining the location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system is:

The GSM bandwidth is embedded as a subband in an uplink UL bandwidth of the LTE/LTE-A system; or the GSM bandwidth is used as a subband, one part is embedded in the uplink bandwidth of the LTE/LTE-A system, and the other part is embedded. The LTE/LTE-A system downlink DL bandwidth is placed outside the LTE/LTE-A system bandwidth; or the GSM bandwidth is embedded as a subband in the downlink bandwidth of the LTE/LTE-A system; or The GSM bandwidth is used as a subband, one part is embedded in the downlink bandwidth of the LTE/LTE-A system, and the other part is placed outside the bandwidth of the LTE/LTE-A system.

When determining the location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system, the GSM bandwidth and the uplink bandwidth value of the LTE/LTE-A system are also obtained, and it is determined whether the GSM bandwidth is smaller than the LTE/LTE-A system. The uplink bandwidth, if less, the GSM bandwidth is taken as The subband is embedded in the uplink bandwidth of the LTE/LTE-A system; if not smaller, the GSM bandwidth is used as a subband, one part is embedded in the uplink of the LTE/LTE-A system, and the other part is embedded in the LTE/LTE -A system downlink bandwidth or placed outside the LTE/LTE-A system bandwidth;

When determining whether the GSM bandwidth is smaller than the uplink bandwidth of the LTE/LTE-A system, the uplink bandwidth of the LTE/LTE-A system is the uplink bandwidth remaining after deducting the static pilot and the static physical channel.

After the GSM bandwidth is embedded as a subband in the LTE/LTE-A system bandwidth, the method further includes:

The LTE/LTE-A system radio resource control layer avoids the embedded GSM band when allocating resources for semi-static pilot and semi-static physical channels;

The LTE/LTE-A system media access control layer avoids the GSM frequency band being used by the embedded local cell when scheduling the dynamic pilot and dynamic physical channel resources.

The method for directly superimposing the CDMA signal on the GSM and LTE/LTE-A bands is:

Selecting a CDMA signal to superimpose the frequency domain position, and controlling the received power spectral density PSD of the LTE/LTE-A, GSM and CDMA signals at the CDMA signal superposition;

When the CDMA signal is selected to be superimposed with the GSM and LTE/LTE-A bands, the CDMA forward link signals do not overlap with the reverse link signals.

Wherein the received power spectral density satisfies:

PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

Wherein, InterferenceMargin is a cell interference margin;

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

The PSDRxL is the LTE/LTE-A receiving PSD, the PSDRxC is the receiving PSD of the CDMA system, the SINRC is the signal detecting SINR threshold of the CDMA system, and the noise is the Gaussian white noise PSD. A multi-network common mode system, comprising a frequency band embedding and superposition position selection unit, and a power constraint unit; wherein

The frequency band embedding and superposition location selecting unit is configured to embed a GSM frequency band as a subband of LTE/LTE LTE-A, and embed in a system bandwidth of LTE/LTE-A;

The power constraint unit is configured to superimpose the CDMA signal directly on the GSM and LTE/LTE-A bands.

The band embedding and superposition location selecting unit is used to: when GSM is used as a sub-band of LTE/LTE-A in the LTE/LTE-A system,

The band embedding and superposition location selecting unit is configured to: when determining a location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system:

The band embedding and superposition location selecting unit is further configured to: when determining the location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system:

Obtaining a GSM bandwidth and an uplink bandwidth value of the LTE/LTE-A system, determining whether the GSM bandwidth is smaller than an uplink bandwidth of the LTE/LTE-A system, and if not, embedding the GSM bandwidth as a subband in LTE In the uplink bandwidth of the /LTE-A system; if not less than The GSM bandwidth is used as a subband, one part is embedded in the uplink of the LTE/LTE-A system, and the other part is embedded in the downlink bandwidth of the LTE/LTE-A system or placed outside the bandwidth of the LTE/LTE-A system; When the bandwidth is smaller than the uplink bandwidth of the LTE/LTE-A system, the uplink bandwidth of the LTE/LTE-A system is the uplink bandwidth remaining after deducting the static pilot and the static physical channel.

The system further includes an LTE/LTE-A system radio resource control layer and an LTE/LTE-A system media access control layer;

After the GSM bandwidth is used as a subband in the LTE/LTE-A system bandwidth, the LTE/LTE-A system radio resource control layer and the LTE/LTE-A system media access control layer are respectively used for:

The LTE/LTE-A system radio resource control layer avoids the embedded GSM frequency band when allocating resources for the semi-static pilot and the semi-static physical channel; the LTE/LTE-A system media access control layer is dynamic When the pilot and dynamic physical channel resources are scheduled, the GSM band that is being used by the embedded cell is avoided.

The power constraint unit is configured to: when superimposing the CDMA signal directly on the GSM and LTE/LTE-A bands,

Selecting a CDMA signal to superimpose the frequency domain position, and controlling the receiving PSD of the LTE/LTE-A, GSM, and CDMA signals at the CDMA signal superposition;

Wherein the received power spectral density satisfies:

PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

Wherein, InterferenceMargin is a cell interference margin;

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

Among them, PSDRxL is LTE/LTE-A receiving PSD, PSDRxC is receiving PSD of CDMA system, SINRC is signal detection SINR threshold of CDMA system, and Noise is Gaussian white noise Sound PSD.

The multi-network common mode technology of the invention can enable LTE/LTE-A to be co-frequency networking with GSM and CDMA, and can simultaneously support multiple networks by using a single-channel RRU, effectively reducing the design and manufacturing cost of the RRU, and effectively solving the GSM and CDMA spectrum. Low utilization rate and waste of spectrum resources caused by different inter-system protection intervals; At the same time, it also takes into account other common common mode solutions to save hardware costs and engineering costs, making 3G smooth evolution to LTE/LTE-A work. Risk and implementation difficulties are minimized. DRAWINGS

1 is a schematic diagram of a GSM/LTE-A system and a CDMA, GSM common carrier frequency principle; FIG. 2 is a schematic diagram of a LTE/LTE-A system and a GSM and CDMA co-carrier frequency according to Embodiment 1 of the present invention;

3 is a schematic diagram of a GSM/LTE-A system and a GSM and CDMA co-carrier frequency according to Embodiment 3 of the present invention;

4 is a schematic diagram of an LTE/LTE-A system and a GSM, CDMA common mode system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a multi-network common mode process according to an embodiment of the present invention. detailed description

GSM is a narrowband system, CDMA is a spread spectrum system, and LTE/LTE-A is a broadband system. In practical applications, the GSM system bandwidth can be used as a sub-band of LTE/LTE-A, embedded in the system bandwidth of LTE/LTE-A, and a common mode solution of GSM and LTE/LTE-A common carrier frequency is realized. The CDMA system band is directly superimposed on the common carrier frequency of LTE/LTE-A and GSM, and realizes the common carrier mode of GSM, CDMA, LTE/LTE-A three networks, and realizes GSM, CDMA, LTE as shown in FIG. /LTE-A multiple networks share carrier frequency.

Specifically, combined with the respective network characteristics of GSM, CDMA, LTE/LTE-A, analysis and design The calculation process is as follows:

GSM is a narrowband system, LTE/LTE-A is a broadband system. If a narrowband GSM signal is embedded in a broadband LTE/LTE-A system under the condition of avoiding different system interference, the system of LTE/LTE-A will hardly be affected. Performance, at the same time can guarantee the normal operation of GSM, and achieve common carrier frequency sharing between GSM and LTE/LTE-A. CDMA is a spread spectrum system with hundreds of times of spread spectrum gain, low PSD (Power Spectrum Density), low SINR (Signal Interference Noise Ratio), and low PSD CDMA. The signal is superimposed on the GSM and LTE/LTE-A signals, with little interference to GSM and LTE/LTE-A, and little impact on the performance of GSM and LTE/LTE-A; and the spread spectrum gain of hundreds of times for CDMA systems Its low SINR characteristics make it fully capable of withstanding the interference caused by GSM and LTE/LTE-A.

In order to realize GSM, CDMA, LTE/LTE-A common carrier common mode design, the GSM band can be embedded as a subband of LTE/LTE-A in the system bandwidth of LTE/LTE-A, and the CDMA signal is directly superimposed on On the GSM and LTE/LTE-A bands.

It should be noted that the GSM is embedded in the LTE/LTE-A system as a sub-band of the LTE/LTE-A system, including:

Determining a location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system, and embedding the GSM bandwidth as a sub-band in the determined location; wherein, when embedding the GSM bandwidth, avoiding the bandwidth of the LTE/LTE-A system Static pilot and static physical channel; The static means that the frequency domain position of the pilot or physical channel cannot be changed.

The specific location for embedding is: the GSM bandwidth is embedded as a subband in an uplink (UL, Up Links) bandwidth of the LTE/LTE-A system; or the GSM bandwidth is used as a subband, and a part is embedded in LTE/LTE- In the uplink bandwidth of the A system, another part is embedded in the LTE/LTE-A system downlink (DL, Down Links) bandwidth or placed outside the LTE/LTE-A system bandwidth; or the GSM bandwidth is used as a subband Embedded in the downlink bandwidth of the LTE/LTE-A system; or the GSM bandwidth is used as a subband, and a part of the downlink is embedded in the LTE/LTE-A system In the bandwidth, the other part is outside the bandwidth of the LTE/LTE-A system.

And determining that the GSM bandwidth is embedded in the LTE/LTE-A system bandwidth, the GSM bandwidth and the LTE/LTE-A system uplink bandwidth value are obtained, and determining whether the GSM bandwidth is smaller than the LTE/LTE-A system Uplink bandwidth, if yes, embedding the GSM bandwidth as a subband in the uplink bandwidth of the LTE/LTE-A system; otherwise, the GSM bandwidth is used as a subband and a part is embedded in the LTE/LTE-A system In the uplink bandwidth, another part is embedded in the downlink bandwidth of the LTE/LTE-A system or placed outside the bandwidth of the LTE/LTE-A system. When determining whether the GSM bandwidth is smaller than the uplink bandwidth of the LTE/LTE-A system, the uplink bandwidth of the LTE/LTE-A system is an uplink bandwidth remaining after deducting the static pilot and the static physical channel.

After the GSM bandwidth is embedded as a subband in the LTE/LTE-A system bandwidth, the LTE/LTE-A system radio resource control layer (RRC, Ratio Resources Control) is a semi-static pilot and a semi-static physical channel (semi-static finger) The pilot position or the physical channel time-frequency domain location may be changed by the RRC configuration. When the resource is allocated, the embedded GSM frequency band may be avoided; the LTE/LTE-A system media access control (MAC, Media Access) The Control layer avoids the GSM frequency band being used by the embedded own cell when the resource scheduling is dynamic pilot and dynamic physical channel (dynamically, the pilot position or the physical channel time-frequency domain position can be scheduled by MAC).

Furthermore, when the CDMA signal is directly superimposed on the GSM and LTE/LTE-A bands, the CDMA signal can be selected to superimpose the frequency domain position, and the received power spectrum of the LTE/LTE-A, GSM and CDMA signals at the superposition of the CDMA signal can be controlled. density. Of course, when the CDMA signal is selected to overlap with the GSM and LTE/LTE-A bands, the CDMA forward link signals do not overlap with the reverse link signals.

In addition, when controlling the received power spectral density of LTE/LTE-A, GSM, and CDMA signals at the superposition of CDMA signals, it is necessary to satisfy: PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

Among them, InterferenceMargin is the cell interference margin, which belongs to the existing parameters in the existing wireless system.

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

Among them, PSDRxL is LTE/LTE receiving PSD (in dBm), PSDRxC is CDMA system receiving PSD (in dBm), SINRC is CDMA system signal detection SINR threshold (in dB), and Noise is Gaussian white noise PSD ( Unit dBm).

Several preferred embodiments are presented below in conjunction with the drawings to explain the implementation of the present invention in more detail.

Embodiment 1

This embodiment takes GSM, CDMA, and LTE common mode as an example, and specifically includes:

First, determining that the GSM bandwidth is embedded in the location of the LTE system bandwidth, and embedding the GSM bandwidth as a subband in the determined location;

Considering that the LTE downlink pilot spreads over the entire LTE DL bandwidth, in order to avoid direct mutual interference between the LTE DL pilot and the GSM signal, the GSM bandwidth embedding location is selected on the LTE uplink system bandwidth as much as possible;

The Physical Uplink Control Channel (PUCCH) of the LTE uplink is located at both ends of the bandwidth of the UL system. To avoid interference between the GSM signal and the PUCCH, when the GSM bandwidth is embedded in the LTE uplink, the embedded location should avoid the PUCCH dedicated resource. The rest of the positions can be used as the embedded position, as shown in Figure 2.

Secondly, in order to further reduce the interference between the two systems, after embedding the GSM bandwidth into the bandwidth of the LTE system, the GSM embedded bandwidth can also be processed, specifically involving the following:

LTE Radio Resource Control (RRC) needs to avoid the GSM band when distributing semi-static pilots and semi-static physical channels (such as physical random access channels);

When the LTE MAC is scheduled on a dynamic pilot and a dynamic physical channel (such as a physical uplink shared channel), The GSM band being used cannot be used.

Finally, the CDMA spectrum is directly superimposed on the GSM and LTE signals, and the superposition needs to satisfy the CDMA forward link signal and the reverse link signal do not overlap each other; and the CDMA signal superimposed at LTE/LTE-A, GSM and The received power spectral density of the CDMA signal is:

PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

Among them, InterferenceMargin is the cell interference margin, which belongs to existing parameters in the existing wireless system.

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

There is no chronological order between the above CDMA band superposition process and the GSM band embedding process, and either process may be performed first, or both processes may be performed simultaneously.

Embodiment 2

In this embodiment, it is assumed that the GSM bandwidth does not meet the condition of fully embedding the uplink bandwidth of the LTE system. At this time, half of the GSM bandwidth is embedded in the uplink bandwidth of the LTE system, and the other half is embedded in the downlink bandwidth of the LTE system or placed. Outside the LTE system bandwidth.

When there is a partial embedding in the downlink bandwidth of the LTE system, since the LTE downlink pilot spreads over the entire LTE DL bandwidth, there may be interference between the GSM signal and the LTE downlink pilot, and interference may be considered at this time. And the implementation complexity, and whether to perform interference cancellation processing; and when partially placed outside the bandwidth of the LTE system, the interference between the GSM signal and the LTE system signal can be avoided at this time, but only partial fusion of the GSM bandwidth and the LTE system bandwidth can be realized. Secondly, in order to further reduce the interference between the two systems, after embedding the GSM bandwidth into the LTE system bandwidth, the LTE/LTE-A resources at the GSM embedded bandwidth can also be processed, specifically the following:

LTE RRC needs to avoid the GSM frequency band when semi-static pilot and semi-static physical channel allocation;

The LTE MAC cannot use the GSM band being used when scheduling dynamic and dynamic physical channels.

Superimposing the CDMA spectrum directly on the GSM and LTE signals, the superposition needs to satisfy the LTE/LTE-A, GSM and CDMA signals where the CDMA forward link signal does not overlap with the reverse link signal; The received power spectral density satisfies:

PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

Embodiment 3

This embodiment takes GSM, CDMA, and LTE-A common mode as an example, and specifically includes:

First, determining that the GSM bandwidth is embedded in the location of the LTE-A system bandwidth, and embedding the GSM bandwidth as a sub-band in the determined location;

In order to avoid interference between LTE-A and GSM, this embodiment embeds GSM bandwidth into

In the LTE-A uplink bandwidth, and the GSM bandwidth embedding location avoids the physical uplink control channel, such as Figure 3 shows.

It should be noted that the system bandwidth of GSM is usually 1M to 2M, the bandwidth of LTE system is usually 1.4M to 20M, and the bandwidth of LTE-A system is usually 100M. It can be seen that, in general, narrowband GSM bandwidth can usually be embedded in the uplink bandwidth of the LTE-A system. Since the LTE-A system bandwidth is composed of multiple carrier components (CC, Component Carrier), the GSM bandwidth can be embedded in the corresponding carrier component of the uplink of the LTE-A system while ensuring the guard interval of GSM.

Secondly, in order to further reduce the interference between the two systems, after embedding the GSM bandwidth into the LTE-A system bandwidth, the LTE resources at the GSM embedded bandwidth can also be processed, specifically involving the following:

LTE-A system RRC needs to avoid the GSM band when distributing semi-static pilots and semi-static physical channels (such as physical random access channels);

The LTE-A system MAC may not use the GSM band being used when scheduling dynamic and dynamic physical channel resources (e.g., physical uplink shared channels).

The CDMA spectrum is directly superimposed on the GSM and LTE signals, and the superposition needs to satisfy the LTE/LTE-A, GSM and CDMA signals where the CDMA forward link signal does not overlap with the reverse link signal and the CDMA signal is superimposed. The received power spectral density satisfies:

PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

Among them, PSDRxL is LTE/LTE receiving PSD (in dBm), PSDRxC is CDMA system receiving PSD (in dBm), SINRC is CDMA system signal detection SINR threshold (in dB), and Noise is Gaussian white noise PSD (in dBm).

There is no time sequence between the above CDMA band superposition process and the GSM band embedding process. In order, either process can be performed first, or both processes can be performed simultaneously.

It can be seen from the method of the present invention described above that the LTE/LTE-A system can compensate for the disadvantages of insufficient spectrum utilization and low spectrum efficiency of GSM and CDMA, greatly improving spectrum efficiency; and saving multi-network common mode environment. The number of RRU transmission channels reduces the RRU design and manufacturing cost; at the same time, it takes into consideration the conventional common mode solution, saving other hardware costs and engineering costs, and minimizing the system upgrade cost from GSM to CDMA to LTE/LTE-A; Bu, you can also avoid interference between multiple systems by selecting the GSM bandwidth embedding location and receiving PSD control.

Embodiment 4

The GSM, CDMA and LTE/LTE-A common mode system of the present invention embeds the GSM bandwidth as a subband in the bandwidth of the LTE/LTE-A system, and superimposes the CDMA signal on the GSM and LTE/LTE-A common mode spectrum. The carrier frequency of the GSM, CDMA and LTE/LTE-A systems is implemented.

As shown in FIG. 4, the system specifically includes:

a band embedding and superposition location selecting unit 401, configured to determine a location of a GSM bandwidth embedded in a bandwidth of the LTE/LTE-A system and a CDMA signal superposition location, and embed the GSM bandwidth as a subband in the determined location, so as to be GSM The frequency band acts as a sub-band of LTE/LTE-A and is embedded in the system bandwidth of LTE/LTE-A.

Wherein, when the GSM bandwidth is embedded, the static pilot and/or the static physical channel in the bandwidth of the LTE/LTE-A system may be avoided; the CDMA signal superposition position needs to satisfy the CDMA forward link signal not to reverse The link signal is superimposed.

The LTE/LTE-A resource configuration unit 402 is configured to avoid the embedded GSM frequency band during resource planning according to the embedded location determined by the GSM band embedding device; avoid the embedded used GSM frequency band during resource scheduling.

Wherein, the location where the GSM band embedding device is embedded in the GSM bandwidth may be:

The GSM bandwidth is embedded as a subband in the uplink bandwidth of the LTE/LTE-A system; or By,

The GSM bandwidth is used as a subband, one part is embedded in the uplink bandwidth of the LTE/LTE-A system, and the other part is embedded in the downlink bandwidth of the LTE/LTE-A system or placed outside the bandwidth of the LTE/LTE-A system; or ,

The GSM bandwidth is embedded as a subband in the downlink bandwidth of the LTE/LTE-A system; or

The GSM bandwidth is used as a subband, one part is embedded in the downlink bandwidth of the LTE/LTE-A system, and the other part is placed outside the bandwidth of the LTE/LTE-A system.

In order to reduce interference and determine the location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system, the following location embedding is preferably selected:

Obtaining a GSM bandwidth and an LTE/LTE-A system uplink bandwidth value, determining whether the GSM bandwidth is smaller than an uplink bandwidth of the LTE/LTE-A system, and if yes, embedding the GSM bandwidth as a subband in LTE/ In the uplink bandwidth of the LTE-A system; otherwise, the GSM bandwidth is used as a subband, one part is embedded in the uplink of the LTE/LTE-A system, and the other part is embedded in the downlink bandwidth of the LTE/LTE-A system. Or placed outside the bandwidth of the LTE/LTE-A system.

A power constraint unit 403 is provided for controlling the signal reception PSD at the superposition of the CDMA signal to superimpose the CDMA signal directly on the GSM and LTE/LTE-A bands.

When the PSD is controlled to control the signal at the superposition of the CDMA signal, the CDMA signal superimposed at the receiving PSD can satisfy:

PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

PSDRxL is the LTE/LTE receiving PSD (in dBm), PSDRxC is the receiving PSD (in dBm) of the CDMA system, and SINRC is the signal detection SINR of the CDMA system. Threshold (in dB), Noise is Gaussian white noise PSD (in dBm).

As can be seen from the foregoing embodiments, the multi-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: The GSM frequency band is used as a sub-band of LTE/LTE-A and embedded in the system bandwidth of LTE/LTE-A.

Step 520: Superimpose the CDMA signal directly on the GSM and LTE/LTE-A bands. It should be noted that 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.

Moreover, the CDMA system may include all CDMA systems (such as CDMA-IS95, CDMA-2000, TD-SCDMA, WCDMA, etc.); it can be seen that the three-network common mode in the above description is only an embodiment, and may be used in practical applications. Apply the same method to achieve multi-network common mode.

In summary, the multi-network common mode technology of the present invention enables the LTE/LTE-A network to be co-frequency with GSM and CDMA in both the method and the system, and can simultaneously support multiple networks by using a single-channel RRU, thereby effectively reducing The RRU design and manufacturing cost effectively solves the problem of low spectrum utilization of GSM and CDMA and the waste of spectrum resources caused by the protection interval between different systems. At the same time, it also takes into account the hardware and engineering costs of other conventional common mode solutions. The role of 3G smooth evolution to LTE / LTE-A work risk and implementation difficulties are minimized.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

1. A multi-network common mode method, comprising:

The GSM band of the Global System for Mobile Communications (LTE) is used as a sub-band of Long Term Evolution (LTE)/Advanced Long Term Evolution (LTE-A) embedded in the system bandwidth of LTE/LTE-A; the code division multiple access CDMA signal is directly superimposed on GSM and LTE/LTE-A On the frequency band.

2. The method according to claim 1, wherein the process of embedding GSM as a sub-band of LTE/LTE-A in an LTE/LTE-A system includes:

3. The method of claim 2 wherein the method of determining that the GSM bandwidth is embedded in the location in the LTE/LTE-A system bandwidth is:

The method according to claim 3, wherein when determining that the GSM bandwidth is embedded in a location in the LTE/LTE-A system bandwidth, the GSM bandwidth and the LTE/LTE-A system uplink bandwidth value are also obtained, and the GSM is determined. Whether the bandwidth is smaller than the uplink bandwidth of the LTE/LTE-A system, and if not, embedding the GSM bandwidth as a subband in an uplink bandwidth of the LTE/LTE-A system; if not smaller, the GSM is Bandwidth is used as a subband, part of which is embedded in the uplink of the LTE/LTE-A system, and another part is embedded in the downlink bandwidth of the LTE/LTE-A system or placed Outside the LTE/LTE-A system bandwidth;

The method according to any one of claims 1 to 4, wherein after the GSM bandwidth is embedded as a subband in the LTE/LTE-A system bandwidth, the method further includes:

The method according to any one of claims 1 to 4, wherein the method of directly superimposing a CDMA signal on a GSM and LTE/LTE-A frequency band is:

7. The method according to claim 6, wherein the received power spectral density satisfies: PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

Wherein, InterferenceMargin is a cell interference margin;

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;

Among them, PSDRxL is LTE/LTE-A receiving PSD, PSDRxC is CDMA system receiving PSD, SINRC is CDMA system signal detection SINR threshold, and Noise is Gaussian white noise PSD.

8. A multi-network common mode system, comprising a frequency band embedding and superposition position selecting unit, and a power constraint unit; wherein The frequency band embedding and superposition location selecting unit is configured to embed a GSM frequency band as a subband of LTE/LTE LTE-A, and embed in a system bandwidth of LTE/LTE-A;

9. The system according to claim 8, wherein the band embedding and superposition location selecting unit is configured to: determine GSM bandwidth when embedding GSM as a sub-band of LTE/LTE-A in an LTE/LTE-A system. Embedding a location in the bandwidth of the LTE/LTE-A system, and embedding the GSM bandwidth as a subband in the determined location; wherein, when embedding the GSM bandwidth, avoiding the static pilot in the bandwidth of the LTE/LTE-A system Frequency and static physical channels;

10. The system according to claim 9, wherein the frequency band embedding and superposition location selecting unit is configured to: use the GSM bandwidth as a subband when determining a location of a GSM bandwidth embedded in an LTE/LTE-A system bandwidth Embedding in the uplink UL bandwidth of the LTE/LTE-A system; or the GSM bandwidth is used as a subband, one part is embedded in the uplink bandwidth of the LTE/LTE-A system, and the other part is embedded in the LTE/LTE-A system. Or the DL bandwidth is placed in the downlink bandwidth of the LTE/LTE-A system as a subband; or the GSM bandwidth is used as a subband. One part is embedded in the downlink bandwidth of the LTE/LTE-A system, and the other part is placed outside the bandwidth of the LTE/LTE-A system.

The system according to claim 10, wherein the band embedding and superposition location selecting unit is further configured to: acquire GSM bandwidth and LTE/ when determining a location in which the GSM bandwidth is embedded in the LTE/LTE-A system bandwidth. An LTE-A system uplink bandwidth value, determining whether the GSM bandwidth is smaller than an uplink bandwidth of the LTE/LTE-A system, and if not, embedding the GSM bandwidth as a sub-band in an LTE/LTE-A system In the uplink bandwidth; if not less than, the GSM bandwidth is used as a subband, one part is embedded in the uplink of the LTE/LTE-A system, and the other part is embedded in the downlink bandwidth of the LTE/LTE-A system or Outside the bandwidth of the LTE/LTE-A system; When determining whether the GSM bandwidth is smaller than the uplink bandwidth of the LTE/LTE-A system, the uplink bandwidth of the LTE/LTE-A system is an uplink bandwidth remaining after deducting the static pilot and the static physical channel.

The system according to any one of claims 8 to 11, wherein the system further comprises an LTE/LTE-A system radio resource control layer, and an LTE/LTE-A system media access control layer;

The system according to any one of claims 8 to 11, wherein the power constraint unit is configured to: when superimposing a CDMA signal directly on the GSM and LTE/LTE-A bands:

Selecting a CDMA signal to superimpose the frequency domain position, and controlling the LTE/LTE-A, GSM and CDMA signal receiving PSD at the CDMA signal superposition;

14. The system according to claim 13, wherein the received power spectral density satisfies: PSDRxC-PSDRxL-Noise>=SINRC+InterferenceMargin;

Wherein, InterferenceMargin is a cell interference margin;

That is: PSDRxL<=PSDRxC— Noise— SINRC-InterferenceMargin;