WO2012145999A1

WO2012145999A1 - Common mode method and system for gsm and lte/lte-a

Info

Publication number: WO2012145999A1
Application number: PCT/CN2011/081201
Authority: WO
Inventors: 张庆宏; 王衍文
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-04-25
Filing date: 2011-10-24
Publication date: 2012-11-01
Also published as: CN102761874A; CN102761874B

Abstract

Disclosed in the present invention are a common mode method and system for Global System for Mobile Communications (GSM) and Long Term Evolution/Long Term Evolution-Advanced (LTE/LTE-A), said common mode method comprising: embedding the GSM bandwidth as a sub-band in the LTE/LTE-A system bandwidth so as to enable a common carrier frequency for the GSM and LTE/LTE-A systems. The common mode scheme of the present invention achieves the technical effects of utilizing a single channel remote radio unit (RRU) simultaneously to support both GSM and LTE/LTE-A networks, lowering the RRU design and manufacturing costs, and simplifying the GSM system upgrade to a LTE/LTE-A system.

Description

GSM and LTE/LTE-A common mode method and system

The present invention relates to the field of wireless communication technologies, and in particular, to a Global System for Mobile Communications (GSM) and Long Term Evolution (LTE) 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 is widely used in B3G (Beyond 3rd Generation) and 4G (4th Generation) due to its high spectral efficiency and simple implementation, which greatly improves the spectrum. effectiveness. At present, the mainstream systems of B3G and 4G technologies, LTE and LTE-A (LTE Advanced), adopt OFDM technology.

Advances in technology have indeed made it possible to improve the spectrum efficiency of wireless communication systems; however, GSM is the longest-running wireless network system with the widest number of users to date, and will continue to operate for a long time. The frequency multiplex (FDM, Frequency Division Multiplexing) and Time Division Multiplexing (TDM) spectrum efficiency used by GSM is much lower than that of OFDM. Therefore, a large number of low-frequency bands with excellent wireless performance occupied by GSM cannot be effectively utilized.

The common common mode solution is a common site, a common antenna, a radio remote unit (RRU), and a baseband unit (BBU) designed to reduce construction cost and hardware manufacturing cost. There is no contribution to spectral efficiency. Summary of the invention

The invention provides a GSM and LTE/LTE-A common mode method and system, which are used to solve the existing The common mode solution in the technology cannot improve the spectrum efficiency of the LTE/LTE-A system.

The GSM and LTE/LTE-A common mode methods provided by the present invention include:

Embedding the GSM bandwidth as a subband into the LTE/LTE-A system bandwidth to implement the GSM and

The LTE/LTE-A system has a common carrier frequency.

The embedding the GSM bandwidth as a subband into the LTE/LTE-A system bandwidth specifically includes:

Determining, according to the current GSM and LTE/LTE-A bandwidth configurations, a location of the GSM bandwidth embedded in the LTE/LTE-A system bandwidth, and embedding the GSM bandwidth as a subband in the determined location; wherein, when embedding the GSM bandwidth And avoiding static pilots and static physical channels in the bandwidth of the LTE/LTE-A system.

The embedded location is: the GSM bandwidth is embedded as a subband in an uplink bandwidth of the LTE/LTE-A system; or the GSM bandwidth is used as a subband, and a part of the LTE/LTE-A system is uplinked. In the path 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; or the GSM bandwidth is embedded as a sub-band in the downlink of the LTE/LTE-A system In the bandwidth; 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.

Preferably, the determining, according to the current GSM and LTE/LTE-A bandwidth configuration, the location of the GSM bandwidth embedded in the LTE/LTE-A system bandwidth further includes:

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 embedded as part of the subband in the uplink bandwidth 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 bandwidth of the LTE/LTE-A system.

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

Preferably, 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 avoids the embedded GSM frequency band during resource planning; the LTE/LTE The -A system media access control layer avoids the GSM frequency band being used by the embedded own cell during resource scheduling.

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 When scheduling dynamic pilot and dynamic physical channel resources, the GSM band being used by the embedded cell is avoided.

The present invention also provides a GSM and LTE/LTE-A common mode system, including:

The system embeds GSM bandwidth as a sub-band into the LTE/LTE-A system bandwidth to achieve a common carrier frequency of the GSM and LTE/LTE-A systems.

The system includes:

a GSM band embedding device, configured to determine a location of a GSM bandwidth embedded in an LTE/LTE-A system bandwidth according to a current GSM and LTE/LTE-A bandwidth configuration, and embedding the GSM bandwidth as a subband in the determined location Wherein, when embedding the GSM bandwidth, avoiding static pilots and/or static physical channels in the bandwidth of the LTE/LTE-A system;

The LTE/LTE-A resource configuration apparatus is configured to avoid the embedded GSM frequency band according to the embedded location determined by the GSM frequency band embedding device, and to avoid the embedded GSM frequency band in the resource scheduling The part used.

The GSM band embedding device acquires a GSM bandwidth and an LTE/LTE-A system uplink bandwidth value, and determines whether the GSM bandwidth is smaller than an uplink bandwidth of the LTE/LTE-A system, and if so, The GSM bandwidth is embedded 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 The other part of the uplink bandwidth of the system is embedded in the downlink bandwidth of the LTE/LTE-A system or placed outside the bandwidth of the LTE/LTE-A system.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The GSM and LTE/LTE-A common carrier common mode solution provided by the present invention compensates for the disadvantage of low GSM spectrum efficiency and improves spectrum efficiency through the LTE/LTE-A system; and the common mode solution of the present invention can Reaching a single-channel radio remote unit (RRU) to support both GSM and LTE/LTE-A networks, reducing RRU design and manufacturing costs, and making GSM systems upgrade to LTE/LTE-A systems easier Technical effect. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the drawings Other drawings may also be obtained from these drawings without the inventive labor.

1 is a schematic diagram of a LTE/LTE-A system and a GSM common carrier frequency provided by the present invention; FIG. 2 is a schematic diagram of a LTE/LTE-A system and a GSM shared carrier frequency according to Embodiment 1 of the present invention; 3 is a schematic diagram of a LTE/LTE-A system and a GSM common carrier system; FIG. 4 is a block diagram of an LTE/LTE-A system and a GSM common mode system provided by the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention. Since the GSM network will exist for a long time, a large number of wireless spectrum resources with good wireless performance occupied by GSM cannot be effectively and fully utilized. The introduction of the new generation wireless communication technology LTE/LTE-A cannot improve the spectrum efficiency of these frequency bands. Furthermore, further waste of spectrum resources is caused by the inter-system guard interval introduced to avoid inter-system interference. In order to solve the above problem, the present invention provides a GSM and LTE/LTE-A common mode method and system, which makes LTE/LTE-A and GSM co-frequency networking effectively solve the problem of low GSM spectrum utilization and different systems. The problem of waste of spectrum resources caused by the interval between guards, while taking into account the role of other conventional common mode solutions to save civil engineering and hardware costs.

Specifically, the present invention considers that GSM is a narrowband system, and the LTE/LTE-A system is a broadband system, so the present invention embeds GSM bandwidth as a subband of LTE/LTE-A in the system bandwidth of LTE/LTE-A. Thus, a common mode solution of GSM and LTE/LTE-A common carrier frequency is realized, as shown in FIG. 1, which is a schematic diagram of a common carrier frequency of GSM and LTE/LTE-A. The above solution achieves the spectrum utilization of the LTE/LTE-A system through GSM, and the LTE/LTE-A system improves the efficiency of the GSM spectrum.

The specific implementation process of the method of the present invention is as follows:

First, determining, according to the current GSM and LTE/LTE-A bandwidth configuration, a location where the GSM bandwidth is embedded in the bandwidth of the LTE/LTE-A system, and embedding the GSM bandwidth as a subband in the determined location; wherein, the GSM bandwidth is embedded The static pilot and the static physical channel in the bandwidth of the LTE/LTE-A system are avoided.

Specifically, the location embedded in the bandwidth of the LTE/LTE-A system may be:

The GSM bandwidth is embedded as a subband in the uplink 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 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.

Preferably, when determining the embedded location, interference between GSM and LTE/LTE-A is avoided, and the characteristics of the LTE/LTE-A pilot and the physical channel are selected according to the proportional relationship of the bandwidth of the GSM and LTE/LTE-A systems. Reasonable embedding position.

In this regard, the present invention considers that the LTE/LTE-A system downlink (DL, Down Link) pilot spreads over the entire LTE DL bandwidth. To avoid direct mutual interference between the LTE DL pilot and the GSM signal, the GSM bandwidth embedding position is preferably Selected on the LTE/LTE-A system uplink (UL, Up Link) system bandwidth.

When the uplink bandwidth of the LTE/LTE-A system is selected as the embedded location, it is necessary to determine in advance whether the GSM bandwidth MGSM is smaller than the LTE/LTE-A uplink bandwidth MLTE UL, and if so, the LTE/LTE-A uplink bandwidth is used as Embedded position; otherwise, the GSM bandwidth half bandwidth can be embedded into the LTE/LTE-A uplink bandwidth and the other half embedded in the LTE/LTE-A downlink bandwidth or placed in the LTE/LTE-A system according to the principle of minimum interference. Outside the bandwidth; of course, when the LTE/LTE-A downlink bandwidth MLTE DL is larger than MGSM, the GSM bandwidth can also be embedded in the downlink bandwidth of the LTE/LTE-A system. At this time, due to LTE/LTE The -A system downlink pilots spread throughout the LTE DL bandwidth, so LTE DL pilots and GSM signals may interfere with each other, and the effect is relatively poorer than the embedded uplink.

Specifically, the foregoing GSM bandwidth MGSM includes an uplink bandwidth, an uplink frequency hopping bandwidth, an uplink and downlink protection interval, a downlink bandwidth, and a downlink hopping bandwidth; and the LTE/LTE-A uplink bandwidth MLTE UL is deducted from static pilot and static. Physical channel remaining uplink bandwidth MLTE UL.

The static pilot and the static physical channel are pilot and physical channels whose spectrum positions are not variable, for example: a synchronization channel, a physical broadcast channel, a downlink common pilot, an uplink control channel, etc.; In addition to the static pilot and the static physical channel, the characteristics of the LTE/LTE-A pilot and physical channels can also be divided into semi-static according to the configuration frequency (the spectrum location can be through the radio resource control layer (RRC, Radio Resource Control), such as physical random access channel and dynamic (the spectrum location can be scheduled in the Media Access Control Layer (MAC), such as physical downlink shared channel, physical uplink shared channel).

Secondly, after determining the GSM bandwidth embedding position, in order to reduce the signal interference between the systems, the LTE/LTE-A resource allocation module processes the GSM embedded bandwidth, and the specific performance is as follows:

The LTE/LTE-A RRC tries to avoid the GSM bandwidth including the hopping bandwidth during resource planning. The LTE/LTE-A MAC tries to avoid the GSM band that the embedded cell is using during dynamic scheduling. That is, the RRC of the LTE/LTE-A avoids the inter-system interference caused by the overlap of the LTE/LTE-A and the GSM band when configuring the frequency domain location of the relevant radio channel according to the GSM band embedding position; LTE/LTE-A MAC According to the GSM band embedding position, the frequency domain position of the relevant radio channel is scheduled to avoid inter-system interference caused by overlapping of LTE/LTE-A and GSM bands.

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

First, according to the current GSM and LTE/LTE-A bandwidth configuration, determining a location where the GSM bandwidth is embedded in the bandwidth of the LTE system, and embedding the GSM bandwidth as a subband in the determined location; considering that the LTE downlink pilot is throughout For 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 position 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 location Can be used as an 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 LTE resource allocation module also processes the GSM embedded bandwidth, which specifically relates to the following:

When LTE RRC is allocated on a semi-static pilot and a semi-static physical channel (such as a physical random access channel), it is necessary to avoid the GSM band;

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

Embodiment 2

First, according to the current GSM and LTE/LTE-A bandwidth configuration, determining the location of the GSM bandwidth embedded in the LTE system bandwidth, and embedding the GSM bandwidth as a subband in the determined location; in this embodiment, it is assumed that the GSM bandwidth is not The condition for fully inserting the uplink bandwidth of the LTE system is satisfied. 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 bandwidth of the LTE system.

Where, when partially embedded 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 when partially placed in the LTE When the system bandwidth is outside, the interference between the GSM signal and the LTE system signal can be avoided at this time, but only the 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 resource allocation module also processes the GSM embedded bandwidth, which specifically relates to the following:

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

When the LTE MAC is scheduled for dynamic pilot and dynamic physical channel, it cannot be used. GSM band.

Embodiment 3

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

First, according to the current GSM and LTE/LTE-A bandwidth configuration, determining a location where the GSM bandwidth is embedded in the bandwidth of the LTE-A system, and embedding the GSM bandwidth as a subband in the determined location;

In order to avoid interference between LTE-A and GSM, this embodiment embeds the GSM bandwidth into the LTE-A uplink bandwidth; and the GSM bandwidth embedding location avoids the physical uplink control channel, as shown in FIG.

It should be noted that the system bandwidth of GSM is usually 1M to 2M wide, 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 the narrowband GSM bandwidth can be embedded in LTE in general. In the uplink bandwidth of system A. 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 LTE-A system uplink under the protection interval within the GSM bandwidth.

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-A resource allocation module also processes the GSM embedded bandwidth, which specifically involves 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 GSM and LTE/LTE-A common carrier common mode solution provided by the present invention compensates for the disadvantage of low GSM spectrum efficiency and improves spectrum efficiency through the LTE/LTE-A system; and the common mode solution of the present invention can Supports both GSM and LTE/LTE-A networks with a single channel RRU Network, reducing the design and manufacturing cost of the RRU, and the simpler technical effect of upgrading the GSM system to the LTE/LTE-A system.

For example: If the GSM network frequency reuse factor N, the ratio of the GSM spectrum efficiency to the average spectrum efficiency of LTE is 1: M, the spectrum resource utilization ratio occupied by the GSM network can be increased by N times and the spectrum efficiency is increased by M times. Therefore, the efficiency of the original GSM spectrum resources is increased by NXM times, usually N is 12, M>50. The invention can increase the efficiency of the original spectrum of GSM by hundreds of times while taking into account the other hardware and engineering costs of conventional common mode solutions.

The present invention also provides a GSM and LTE/LTE-A common mode system, which embeds GSM bandwidth as a subband in the bandwidth of the LTE/LTE-A system to implement a common carrier frequency of the GSM and LTE/LTE-A systems.

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

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

In order to reduce interference, the GSM band embedding device determines the position of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system according to the current GSM and LTE/LTE-A bandwidth configuration, and preferably selects the sub-portal embedding:

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.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Claim

1. A global mobile communication system GSM and long-term evolution LTE/LTE-A common mode method, characterized in that it comprises:

The GSM bandwidth is embedded as a sub-band in the LTE/LTE-A system bandwidth to implement the GSM and LTE/LTE-A system common carrier frequency.

2. The method according to claim 1, wherein the embedding the GSM bandwidth as a subband in the LTE/LTE-A system bandwidth comprises:

The method according to claim 2, wherein the embedded location is: the GSM bandwidth is embedded as a subband in an uplink bandwidth of an 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 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 method according to claim 2 or 3, wherein the determining, according to the current GSM and LTE/LTE-A bandwidth configuration, the location of the GSM bandwidth embedded in the bandwidth of the LTE/LTE-A system further comprises:

Obtaining the GSM bandwidth and the uplink bandwidth value of the LTE/LTE-A system, and determining the GSM band Whether the width is smaller than the uplink bandwidth of the LTE/LTE-A system, and if so, embedding the GSM bandwidth as a subband in an uplink bandwidth of the LTE/LTE-A system; otherwise, the GSM bandwidth is used as a subband The band 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.

The method according to claim 4, wherein, when the 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 deducted The remaining uplink bandwidth after static pilot and static physical channels.

The method according to claim 1 or 2 or 3, wherein after the GSM bandwidth is embedded as a subband in an LTE/LTE-A system bandwidth, the LTE/LTE-A system radio resource control layer is During resource planning, the embedded GSM frequency band is avoided; the LTE/LTE-A system medium access control layer avoids the GSM frequency band being used by the embedded local cell during resource scheduling.

The method according to claim 4, wherein, 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 is in resource planning, Avoiding the embedded GSM frequency band; the LTE/LTE-A system medium access control layer avoids the GSM frequency band being used by the embedded local cell during resource scheduling.

A GSM and LTE/LTE-A common mode system, comprising: the system embedding a GSM bandwidth as a subband in an LTE/LTE-A system bandwidth to implement the GSM and LTE/LTE-A The system has a total carrier frequency.

9. The system of claim 8 wherein: the system comprises:

LTE/LTE-A resource configuration apparatus, configured to avoid an embedded GSM frequency band according to the embedded location determined by the GSM frequency band embedding device; avoiding embedding during resource scheduling The GSM band that the cell is using.

10. The system according to claim 9, wherein the GSM band embedding device acquires a GSM bandwidth and an LTE/LTE-A system uplink bandwidth value, and determines 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 taken 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 downlink bandwidth of the LTE/LTE-A system or placed outside the bandwidth of the LTE/LTE-A system.