CN101056292A - Time frequency resource allocation method, device and base station and radio communication device applying same - Google Patents

Abstract

The invention discloses a method for allocating time-frequency resources in a wireless communication system. The method includes: A. Dividing the working bandwidth into more than one subband, and each cell selects at least one subband as the main frequency subband of the cell , and the remaining part is used as the sub-frequency sub-band of this cell; B. assign the main frequency sub-band of each cell to the distributed transmission or centralized transmission of the cell, and assign the sub-frequency sub-band of each cell to the distributed transmission of the cell or centralized transmission. The invention also discloses a time-frequency resource allocation device in a wireless communication system, a base station and a wireless communication system using the same. After applying the present invention, the dispersed transmission sub-bands can be concentrated on the main frequency sub-band or the sub-frequency sub-band as much as possible, so when soft frequency multiplexing is adopted, the dispersed transmission users can occupy as many frequency resources as possible, so it can Significantly improve diversity performance.

Description

Time-frequency resource allocation method, device, and base station and wireless communication system using the same

technical field

The present invention relates to the technical field of wireless communication, more specifically, to a time-frequency resource allocation method and device, a base station and a wireless communication system using the same.

Background technique

The second-generation mobile communication uses time division multiple access (TDMA) and narrowband code division multiple access (CDMA) as the main access technologies, such as the global mobile communication (GSM) system and the CDMA IS-95 mobile communication system. The three generations of mobile communication use broadband CDMA as the main access technology, such as Universal Mobile Telecommunications System (UMTS) and WCDMA mobile communication system. In CDMA technology, a user's data symbol will occupy all the carrier frequency width, and different users or user data are distinguished by spreading codes. Since the multipath channel destroys the orthogonality between spreading codes, the CDMA technology becomes a self-interfering system. Therefore, the system capacity and spectral efficiency cannot meet the requirements of broadband wireless communication.

The next-generation mobile communication technology needs to support a wide range of business types such as voice, data, audio, video, and images. In order to support a variety of business types, the next generation mobile communication system is required to support higher data rates, higher spectral efficiency, and a complete quality of service (QoS) guarantee mechanism, and provide better mobility support and wireless network coverage. The goal of providing communication services to users anytime, anywhere.

Since the 1990s, multi-carrier technology has become a hot technology in broadband wireless communication. Its basic idea is to divide a broadband carrier into multiple sub-carriers and transmit data on multiple sub-carriers simultaneously. In most system applications, sub-carriers The width of is smaller than the coherence width of the channel, so that on the frequency selective channel, the fading on each subcarrier is flat fading, which reduces the interference between symbols and does not require complex channel equalization, which is suitable for high-speed data transmission. There are many forms of multi-carrier technology, such as Orthogonal Frequency Division Multiplexing (OFDM), Multi-Carrier CDMA (MC-CDMA), Multi-Carrier Direct Spread CDMA (MC-DS-CDMA), Multi-Tone CDMA (MT-CDMA), Multi-carrier TDMA (MC-TDMA), two-dimensional time-frequency domain extension, and various extension technologies based on the above.

OFDM technology is a representative technology among multi-carrier technologies. In OFDM technology, a given channel is divided into many orthogonal sub-channels in the frequency domain, and the sub-carrier spectrum is allowed to partially overlap. As long as the sub-carriers are mutually orthogonal, the data signal can be separated from the aliased sub-carriers.

Figure 1A shows a schematic diagram of the user data transmission process in OFDM technology. As shown in Figure 1A, the user data is firstly processed by channel coding and interleaving, and some modulation methods, such as binary phase shift keying (BPSK, Binary Phase Shift Keying) modulation, quadrature phase shift keying signal (QPSK, Quaternary Phase Shift Keying) modulation, quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation), etc. to form symbols, and then modulated to the radio frequency through OFDM operation. In the OFDM operation, the symbols are first serially/parallel converted to form multiple low-speed sub-data streams, each of which occupies a sub-carrier; the mapping from sub-data streams to sub-carriers can be done through inverse discrete Fourier transform (IDFT) or inverse fast Fourier transform (IFFT); at the same time, OFDM technology uses cyclic prefix (CP) as the guard interval, which greatly reduces or even eliminates intersymbol interference, and ensures the orthogonality between channels, thus greatly reducing the inter-channel interference. mutual interference.

Since 1993, technologies combining strong multi-carrier modulation and CDMA have appeared one after another. At present, these technologies are usually divided into two categories: frequency domain extension and time domain extension. As shown in Figure 1B, user data is channel coded, Symbols are formed after interleaving and modulation, and the formed symbols are expanded in the frequency domain or time domain before OFDM operation. If only the symbols are extended in the frequency domain, it is called MC-CDMA; if only the symbols are extended in the time domain, it is called MC-DS-CDMA; if both the frequency domain extension and the time domain extension of the symbols exist simultaneously, then It is called multi-carrier technology with two-dimensional extension in time-frequency domain.

It can be seen from the above description that the mapping of multi-carriers is realized by IDFT or IFFT, and the spectrums of the sub-carriers overlap each other and remain orthogonal, and the interference between symbols can be overcome by using a cyclic prefix. In the OFDM technology, the out-of-band attenuation of the subcarrier spectrum can also be accelerated through windowing, and there are also some technical means to avoid the use of cyclic prefixes. In this way, the user data transmission process in the multi-carrier technology is shown in Figure 1C. The user data is first subjected to modulation processing, which may include a series of operations such as channel coding, interleaving, symbol modulation, and time domain and/or frequency domain extension. The data obtained after modulation processing is mapped to multiple subcarriers by certain technical means after serial/parallel conversion. These subcarriers can be orthogonal or non-orthogonal, and then passed through parallel/parallel Serial modulation to the radio frequency.

The OFDM technology was first proposed in the mid-1960s, but for a long time thereafter, the OFDM technology has not been applied on a large scale. At that time, the development of OFDM technology encountered many difficult problems. First of all, OFDM operation requires each subcarrier to be orthogonal to each other. Although this modulation method can be well realized by fast Fourier transform (FFT) in theory, in practice In application, according to the technical means provided at that time, such complex real-time Fourier transform equipment could not be realized at that time. In addition, factors such as the stability of transmitter oscillators and receiver oscillators and the linearity requirements of radio frequency power amplifiers have also become constraints for the realization of OFDM technology. Since the 1980s, the development of large-scale integrated circuit technology has solved the problem of FFT realization. With the development of digital signal processing (DSP) technology, OFDM technology has begun to transform from theory to practical application.

OFDM technology has quickly become the focus of research due to its inherent strong resistance to delay extension and high spectral efficiency, and has been adopted by many international standards, such as European Digital Audio Broadcasting (DAB), European Digital Video Broadcasting (DVB), High Performance Local Area Network (HIPERLAN, High Performance Local Area Network), Institute of Electrical and Electronics Engineers (IEEE) 802.11 Wireless Local Area Network, IEEE802.16 Wireless Metropolitan Area Network and other systems all use OFDM technology. At the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) Radio Access Network (RAN, Radio Access Network) conference held in 2004, multi-carrier technology became the main access technology discussed.

Since the frequency reuse factor in the interference-limited CDMA system is 1, not only the spectrum efficiency is high, but also frequency planning is not required, which simplifies network planning. But in a multi-carrier system, the frequency reuse factor of 1 cannot achieve the optimal spectrum efficiency.

In a multi-carrier system, multiple users are multiplexed together by occupying different time-frequency resources. In the 3GPP technical report 25.814, it is pointed out that the uplink and downlink of the EUTRA system adopt SC-FDMA technology and OFDMA technology respectively. The report also mentions that regardless of uplink and downlink, user data can be multiplexed in two ways, namely Localized Transmission and Distributed Transmission. The former combines a certain number of adjacent subcarriers (subbands) within a certain time unit (such as a time slot) into a minimum time-frequency resource unit and allocates it to users, as shown in Figure 2A; the latter distributes a certain number of adjacent subcarriers (subbands) within a certain time unit The subcarriers are combined into the smallest time-frequency resource unit and allocated to users to achieve the effect of frequency diversity. Distributed transmission can have two forms, one is non-frequency hopping mode, that is, the user occupies the same subcarrier position on adjacent symbols within a certain time unit, as shown in Figure 2B; the other is frequency hopping The mode, that is, the positions of subcarriers occupied by users on different symbols can be changed, as shown in FIG. 2C . The gray grids in Figures 2A-2C indicate the time-frequency resources occupied by a user, and the frequency unit is one or several adjacent subcarriers.

In the patent application with Chinese patent application number 200510067540.2 and the application name "A Method for Realizing Soft Frequency Reuse in Wireless Communication System", the applicant proposed a scheme for soft frequency reuse. In this solution, the frequency reuse factor of 1 is reserved inside the cell, and the interference between cells is reduced through frequency grouping planning at the cell border, so as to improve the communication quality and spectrum efficiency at the cell border. The specific method is: divide all subcarriers into N groups, each cell selects one of them as the primary subcarrier of the cell, and other subcarriers as secondary subcarriers of the cell, and sets different settings for the primary subcarriers and secondary subcarriers. transmit power threshold. Generally, the transmit power threshold of the primary subcarrier is higher than the transmit power threshold of the secondary subcarrier. By selecting different primary subcarriers for adjacent cells and allocating primary subcarriers with higher power to users at the cell borders, the interference at cell borders can be reduced.

According to this method, for the cell boundary, a frequency reuse scheme with a frequency reuse factor of 3 is used, and for the inside of the cell, a frequency reuse scheme with a frequency reuse factor of 1 is used. Due to the limitation of the transmission power inside the cell, the reuse factor Island coverage of 1. By setting different frequency reuse factors in different areas of a cell, on the one hand, the interference problem of adjacent cells in the case of continuous coverage is solved, and the communication rate at the cell boundary is improved; on the other hand, precious frequency resources are fully utilized to realize According to the method proposed in this application, the inter-cell interference problem can be solved in a controllable manner, which is conducive to the implementation of radio resource management strategies and makes the operation of the network more stable.

However, when the frequency soft multiplexing scheme is adopted, since the division of primary subcarriers and user resource allocation are carried out independently, it is easy to cause the resources allocated to a single user to include both primary subcarriers and secondary subcarriers. It is obviously contrary to the original intention of the soft multiplexing scheme, and it cannot solve the interference problem at the cell boundary. For example, in a specific implementation scheme of soft frequency multiplexing, the concepts of main frequency subband (main frequency band) and secondary frequency subband (secondary frequency band) are proposed, and the width of these subbands is the same as the subband in the prior art scheme The width remains the same. Since the division of main frequency subbands and sub frequency subbands and the division of dispersed transmission subbands and concentrated transmission subbands are still carried out independently, the situation that both main frequency subbands and sub frequency subbands are included in the same kind of transmission subbands still exists. Although the combination of centralized transmission and frequency soft multiplexing can be solved by comprehensively considering the transmission power and channel conditions, for decentralized transmission, a single user can only occupy the main frequency subband or sub-frequency subband in the scattered transmission subbands, which is extremely difficult. This greatly limits the user's diversity performance. Especially for the cell boundary users who must use the main frequency, since there are fewer main frequency subbands, there are fewer main frequency subbands located in the scattered transmission subbands, and this problem becomes more prominent.

Contents of the invention

In view of this, the main purpose of the present invention is to propose a time-frequency resource allocation method in a wireless communication system, so that when soft frequency multiplexing is adopted, distributed transmission users can occupy as many frequency resources as possible, thereby improving diversity performance .

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for allocating time-frequency resources in a wireless communication system, the method comprising:

A. Divide the working bandwidth into more than one sub-band, each cell selects at least one sub-band as the primary frequency sub-band of the cell, and the remaining part as the sub-frequency sub-band of the cell;

B. Allocating the primary frequency subband of each cell to the distributed or centralized transmission of the cell, and allocating the secondary frequency subband of each cell to the distributed or centralized transmission of the cell.

The step B includes: allocating all main frequency subbands as dispersed transmission subbands, and allocating all subfrequency subbands as concentrated transmission subbands.

The step B includes: allocating all main frequency subbands as concentrated transmission subbands, and allocating all subfrequency subbands as scattered transmission subbands.

The step B includes: allocating the entire working bandwidth as distributed transmission subbands, or allocating the entire working bandwidth as concentrated transmission subbands.

The step B includes: allocating only the main frequency sub-band or only allocating the sub-frequency sub-band to the same data block.

The step A includes: when the number of main frequency subbands increases, under the premise of not affecting the interference coordination, retain the main frequency subband when the number of main frequency subbands is small as the new main frequency subband.

The step A includes: selecting one subband or more than one uniformly distributed subbands as the main frequency subband of the cell.

A device for allocating time-frequency resources in a wireless communication system, the device comprising:

The main and sub-band division module is used to divide the working bandwidth into more than one sub-band, and each cell selects at least one sub-band as the main frequency sub-band of the cell, and the remaining part is used as the sub-frequency sub-band of the cell;

The transmission subband division module is used to allocate the main frequency subband of each cell to the distributed transmission or centralized transmission of the cell, and assign the sub-frequency subband of each cell to the distributed transmission or centralized transmission of the cell;

The main and sub-band division module is connected to the transmission sub-band division module.

The transmission subband division module is used to allocate all main frequency subbands as dispersed transmission subbands, and allocate all subfrequency subbands as concentrated transmission subbands.

The transmission subband division module is used to allocate all main frequency subbands as concentrated transmission subbands, and allocate all subfrequency subbands as scattered transmission subbands.

The transmission subband division module is used to allocate the entire working bandwidth as dispersed transmission subbands, or to allocate the entire working bandwidth as concentrated transmission subbands.

The wireless communication system is a multi-carrier wireless communication system.

A base station, the base station includes the device for allocating time-frequency resources in the wireless communication system according to any one of the above items.

A wireless communication system comprising a base station and a mobile station communicating with the base station,

Wherein the base station includes the time-frequency resource allocation device in any one of the above wireless communication systems, and the base station is used to allocate the time-frequency resources allocated to the main frequency sub-band, sub-frequency sub-band, centralized transmission and distributed transmission Notify the mobile station of the information;

The mobile station is configured to adjust a time-frequency position for receiving information according to the time-frequency resource information.

It can be seen from the above technical solutions that in the present invention, the operating bandwidth is used as the operation object. The working bandwidth here usually refers to the system bandwidth, such as 1.25M, 2.5M, 5M, 10M, 20M bandwidth; it can also refer to a section of independent frequency bands divided within the system bandwidth, and each such independent frequency band operates at a fixed time ( For example, a subframe) has its own specific user group, that is, the same user cannot occupy two or more working bandwidths at the same time. The most common situation is to divide the 20M system bandwidth into two 10M working bandwidths.

In the present invention, at first the working bandwidth is divided into subbands greater than one, and each sub-district selects at least one sub-band as the main frequency sub-band of the sub-district, and the remaining part is used as the sub-frequency sub-band of the sub-district; then each sub-district The main frequency sub-band of each cell is allocated to the distributed transmission or concentrated transmission of the cell, and the sub-frequency sub-band of each cell is allocated to the distributed transmission or concentrated transmission of the cell. Therefore, after the application of the present invention, when allocating time-frequency resources for users, the main and sub-frequency division of frequency soft multiplexing is also considered, so that the two can be organically combined, so the scattered transmission sub-bands can be concentrated on the main frequency as much as possible. sub-band or try to concentrate on the sub-frequency sub-band. Therefore, when soft frequency multiplexing is adopted, after applying the present invention, distributed transmission users can occupy as many frequency resources as possible, thereby significantly improving diversity performance.

Description of drawings

FIG. 1A shows a schematic diagram of user data transmission process in OFDM technology;

FIG. 1B shows a schematic diagram of the user data transmission process in the frequency domain/time domain extension technology;

FIG. 1C shows a schematic diagram of user data transmission process in multi-carrier technology;

Figure 2A shows an exemplary embodiment of centralized transmission;

Figure 2B shows an exemplary embodiment of a non-frequency hopping mode of distributed transmission;

Figure 2C shows an exemplary embodiment of a dispersive transmission frequency hopping pattern;

FIG. 3 shows an exemplary flowchart of a method for allocating time-frequency resources in a wireless communication system according to the present invention;

FIG. 4A is an exemplary embodiment of time-frequency resource allocation according to the first embodiment of the present invention;

FIG. 4B is an exemplary embodiment of time-frequency resource allocation according to the second embodiment of the present invention;

FIG. 4C is an exemplary embodiment of time-frequency resource allocation according to the third embodiment of the present invention;

FIG. 4D is an exemplary embodiment of time-frequency resource allocation according to the fourth embodiment of the present invention;

FIG. 4E is an exemplary embodiment of time-frequency resource allocation according to the fifth embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an apparatus for allocating time-frequency resources according to an exemplary embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The main idea of the present invention is: when allocating time-frequency resources for users, the main and sub-frequency division method of frequency soft multiplexing is considered at the same time, so that the allocation of time-frequency resources and the main and sub-frequency division of frequency soft multiplexing are organically combined, thereby Improve system performance. That is, first divide the working bandwidth into more than one sub-band, each cell selects at least one sub-band as the primary frequency sub-band of the cell, and the rest as the sub-frequency sub-band of the cell; then, the sub-band of each cell The primary frequency sub-band is allocated to the distributed or concentrated transmission of the cell, and the sub-frequency sub-band of each cell is allocated to the distributed or concentrated transmission of the cell.

Fig. 3 shows an exemplary flowchart of a method for allocating time-frequency resources in a wireless communication system according to the present invention. As shown in Figure 3, the exemplary process includes:

Step 301: Divide the working bandwidth into more than one sub-band, each cell selects at least one sub-band as the main frequency sub-band of the cell, and the rest as the sub-frequency sub-band of the cell.

Here, the operating bandwidth is used as the operation object. The working bandwidth here usually refers to the system bandwidth, such as 1.25M, 2.5M, 5M, 10M, 20M bandwidth; it can also refer to a section of independent frequency bands divided within the system bandwidth, and each such independent frequency band operates at a fixed time ( For example, a subframe) has its own specific user group, that is, the same user cannot occupy two or more working bandwidths at the same time. Wherein it is preferable to select one subband or more than one uniformly distributed subbands as the main frequency subband of the cell. Moreover, preferably, when the number of main frequency subbands increases, the main frequency subband when the number of main frequency subbands is small is reserved as a new main frequency subband without affecting interference coordination.

Step 302: Resource allocation is performed on the main frequency subband and the sub frequency subband respectively, the main frequency subband of each cell is allocated to the decentralized transmission and/or centralized transmission of the cell, and the sub frequency subband of each cell is allocated Distributed transmission and/or centralized transmission to the cell.

Here, it is preferable to allocate all main frequency subbands as concentrated transmission subbands, and allocate all sub frequency subbands as scattered transmission subbands; or, it is also possible to allocate all main frequency subbands as scattered transmission subbands, and allocate all sub frequency subbands Frequency subbands are used as concentrated transmission subbands.

Preferably, the entire working bandwidth is allocated as concentrated transmission sub-bands.

Preferably, the entire operating bandwidth is allocated as dispersed transmission subbands. Among them, it is preferable to allocate all main frequency subbands to dispersed transmission users who need high-power transmission or reception.

Preferably, when the distributed transmission must occupy the main frequency and the number of occupied frequency bands is less than the number of main frequency subbands, a part of the main frequency band is allocated as the distributed transmission subbands, and the remaining frequency bands are allocated as the concentrated transmission subbands.

Preferably, when the dispersed transmission must occupy the main frequency, and the number of occupied frequency bands is more than the number of main frequency sub-bands, all the main frequency sub-bands and a part of the sub-frequency sub-bands are allocated as dispersed transmission sub-bands, and the remaining frequency bands are allocated as concentrated transmission Subband. Among them, it is preferable to allocate all main frequency subbands to dispersed transmission users who need high-power transmission or reception.

Preferably, when distributed transmission only occupies sub-frequency, and the number of occupied frequency bands is less than the number of sub-frequency sub-bands, a part of sub-frequency sub-bands are allocated as distributed transmission sub-bands, and the remaining frequency bands are allocated as concentrated transmission sub-bands.

Preferably, in step 302, one subband or more than one uniformly distributed subbands are assigned as dispersed transmission subbands. Furthermore, preferably, when the number of distributed transmission subbands increases, the distributed transmission subband when the number of distributed transmission subbands is small is reserved as a new distributed transmission subband. Moreover, the distributed transmission in step 302 may be distributed transmission in a non-frequency hopping mode or distributed transmission in a frequency hopping mode.

Among the various allocation methods, a preferred embodiment is to make the division of the concentrated transmission subbands and the scattered transmission subbands completely consistent with the division of the main and sub-frequency subbands. That is, allocate all main frequency subbands as concentrated transmission subbands, and allocate all subfrequency subbands as scattered transmission subbands; or allocate all main frequency subbands as scattered transmission subbands, and allocate all subfrequency subbands as concentrated transmission subbands.

In various allocation manners, it is preferable to allocate only the main frequency subband or only the sub frequency subband to the same data block.

The wireless communication system here is preferably a multi-carrier wireless communication system, more preferably, the multi-carrier wireless communication system is an orthogonal frequency division multiplexing wireless communication system, or a multi-carrier code division multiple access wireless communication system, or is The multi-carrier direct spread code division multiple access wireless communication system, or the multi-tone code division multiple access wireless communication system, or the multi-carrier time division multiple access wireless communication system, or the time-frequency domain two-dimensional extended multi-carrier wireless communication system.

FIG. 4A is an exemplary embodiment of time-frequency resource allocation according to the first embodiment of the present invention. The first embodiment corresponds to the situation that when the dispersed transmission must occupy the main frequency and the number of occupied frequency bands is less than the number of main frequency subbands, a part of the main frequency band is allocated as the dispersed transmission subband, and the rest of the frequency band is allocated as the concentrated transmission subband . FIG. 4B is an exemplary embodiment of time-frequency resource allocation according to the second embodiment of the present invention. The second embodiment corresponds to allocating all main frequency subbands as distributed transmission subbands, and allocating all subfrequency subbands as concentrated transmission Subbands; FIG. 4C is an exemplary embodiment of time-frequency resource allocation according to the third embodiment of the present invention. The third embodiment corresponds to when the distributed transmission must occupy the main frequency, and the number of occupied frequency bands is more than the number of main frequency subbands When counting, allocate all main frequency subbands and a part of subfrequency subbands as scattered transmission subbands, and allocate the remaining frequency bands as centralized transmission subbands; FIG. 4D is an exemplary time-frequency resource allocation according to the fourth embodiment of the present invention Embodiment, the fourth embodiment corresponds to when the distributed transmission only occupies the sub-frequency, and the number of occupied frequency bands is less than the number of sub-frequency sub-bands, allocate a part of the sub-frequency sub-bands as the distributed transmission sub-bands, and allocate the rest of the frequency bands as centralized transmission The case of subbands; FIG. 4E is an exemplary embodiment of time-frequency resource allocation according to the fifth embodiment of the present invention. The fifth embodiment corresponds to when all main frequency subbands are allocated as centralized transmission subbands, and all subfrequency subbands are allocated The subbands are used as the case of scattered transmission subbands.

In the example shown in FIGS. 4A-4E , the working bandwidth is divided into several subbands, and 1/3 of the subbands are divided into main frequency subbands, and these subbands are evenly distributed. In the first embodiment, the distributed transmission occupies 1/6 of the total resources, and all of them are in the main frequency subband; in the second embodiment, the distributed transmission occupies 1/3 of the total resources, and all of them are in the main frequency subband; In the third embodiment, distributed transmission occupies 2/3 of the total resources, half of which is in the main frequency sub-band and half in the sub-frequency sub-band; in the fourth embodiment, distributed transmission occupies 1/3 of the total resources, and All are in the sub-frequency sub-band; in the fifth embodiment, the distributed transmission occupies 2/3 of the total resources, and all are in the sub-frequency sub-band. In these instances, the subbands occupied by the scattered transmissions are relatively evenly distributed across the frequency domain. The slanted areas in Fig. 4A-4E indicate scattered transmission subbands, and the remaining blank areas indicate concentrated transmission subbands.

In addition, in the sixth embodiment, the distributed transmission can also occupy the entire working bandwidth; in the seventh embodiment, the centralized transmission can also occupy the entire working bandwidth.

In addition, those skilled in the art can appreciate that although the specific implementation manners of frequency band division and frequency band allocation are listed above, the present invention is not limited thereto, but may have various implementation forms.

At the same time, the invention also proposes a time-frequency resource allocation device in a wireless communication system. Fig. 5 is a structural diagram of an apparatus 500 for allocating time-frequency resources in a wireless communication system according to an exemplary embodiment of the present invention. As shown in Figure 5, the device 500 includes:

The primary and secondary frequency band division module 501 is used to divide the working bandwidth into more than one sub-band, and each cell selects at least one sub-band as the primary frequency sub-band of the cell, and the remaining part is used as the sub-frequency sub-band of the cell;

The transmission sub-band division module 502 is configured to allocate resources to the main frequency sub-band and the sub-frequency sub-band respectively, allocate the main frequency sub-band of each cell to the decentralized transmission and/or centralized transmission of the cell, and allocate each cell The sub-frequency subband allocated to the cell for distributed transmission and/or centralized transmission.

The primary and secondary frequency band division module 501 is connected to the transmission subband division module 502 .

Preferably, the transmission subband division module 502 can be used to allocate all main frequency subbands as scattered transmission subbands, and allocate all sub frequency subbands as concentrated transmission subbands, or allocate all main frequency subbands as centralized transmission subbands, and allocate all subfrequency subbands as scattered transmission subbands.

Preferably, the transmission subband division module 502 can be used to allocate the entire working bandwidth as scattered transmission subbands. Preferably, the transmission subband division module 502 can also be used to allocate the main frequency subbands to those requiring high power transmission Or receiving decentralized transmission users.

Preferably, the transmission subband dividing module 502 can be configured to allocate the entire working bandwidth as concentrated transmission subbands.

Preferably, the transmission subband division module 502 can be used to allocate a part of the main frequency subbands as dispersed transmission subbands when the distributed transmission must occupy the main frequency and the number of occupied frequency bands is less than the number of main frequency subbands The frequency band acts as a concentrated transmission sub-band.

Preferably, the transmission subband division module 502 can also be used to allocate all main frequency subbands and a part of subfrequency subbands as Disperse the transmission subbands and allocate the remaining frequency bands as concentrated transmission subbands. Preferably, the transmission subband division module 502 can also be used to allocate the main frequency subbands to the dispersed transmission subbands that require high-power transmission or reception.

Preferably, the transmission sub-band division module 502 can also be used to allocate a part of the sub-frequency sub-bands as distributed transmission sub-bands when the distributed transmission only occupies sub-frequency and the number of occupied frequency bands is less than the number of sub-frequency sub-bands. The remaining frequency bands are used as concentrated transmission sub-bands.

Preferably, the transmission sub-band division module 502 can be used to allocate only the main frequency sub-band or only the sub-frequency sub-band to the same data block.

Preferably, the main frequency subband division module 501 can be used to reserve the main frequency subband when the number of main frequency subbands is small as the new main frequency subband without affecting interference coordination when the number of main frequency subbands increases. frequency subband. The primary and secondary frequency band division module 501 can also be used to select one subband or more than one uniformly distributed subbands as the primary frequency subband of the cell.

The transmission subband dividing module 502 may also be configured to reserve the distributed transmission subband when the number of distributed transmission subbands is small as a new distributed transmission subband when the number of distributed transmission subbands increases. The transmission subband division module 502 may also be configured to allocate one subband or more than one uniformly distributed subbands as dispersed transmission subbands.

It can be appreciated that the present invention can be applied to a base station of a wireless communication system to implement time-frequency resource allocation to the communication system. For example, any one of the time-frequency resource allocation devices described above can be applied to the base station. For those skilled in the art, it is obvious to couple the apparatus for allocating time-frequency resources with the base station to implement a communication connection, so details are not repeated here.

Likewise, the present invention can also be applied to various wireless communication systems. Usually, the applied wireless communication system includes a base station and a mobile station communicating with the base station, wherein the base station includes any one of the above-mentioned time-frequency resource allocation devices, and the base station is used to allocate The time-frequency resource information of the transmission and distributed transmission is notified to the mobile station, so that the mobile station can adjust the time-frequency position for receiving information according to the time-frequency resource information.

In the above description, the present invention is especially applicable to multi-carrier wireless communication systems. These multi-carrier wireless communication systems include but are not limited to: orthogonal frequency division multiplexing wireless communication systems, or multi-carrier code division multiple access wireless communication systems, or multi-carrier direct spread code division multiple access wireless communication systems, Or it is a multi-tone code division multiple access wireless communication system, or it is a multi-carrier time division multiple access wireless communication system, or it is a time-frequency domain two-dimensional extended multi-carrier wireless communication system.

To sum up, after applying the present invention, when allocating time-frequency resources for users, the primary and secondary frequency division method of frequency soft multiplexing is considered at the same time, so that the two are organically combined, thereby improving system performance. Specifically, the present invention can concentrate the dispersed transmission sub-bands on the main frequency sub-band or the sub-frequency sub-band as much as possible, so that when soft frequency multiplexing is adopted, the distributed transmission users can occupy as many frequency resources as possible, significantly improving Improve diversity performance.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (14)

1. A time-frequency resource allocation method in a wireless communication system, characterized in that the method comprises: A. Divide the working bandwidth into more than one sub-band, each cell selects at least one sub-band as the primary frequency sub-band of the cell, and the remaining part as the sub-frequency sub-band of the cell; B. Allocating the primary frequency subband of each cell to the distributed or centralized transmission of the cell, and allocating the secondary frequency subband of each cell to the distributed or centralized transmission of the cell. 2. The method for allocating time-frequency resources in a wireless communication system according to claim 1, wherein said step B comprises: allocating all main frequency subbands as scattered transmission subbands, and allocating all subfrequency subbands Assigned as concentrated transmission subbands. 3. The method for allocating time-frequency resources in a wireless communication system according to claim 1, wherein said step B comprises: allocating all main frequency subbands as centralized transmission subbands, and allocating all subfrequency subbands Assigned as scatter transmission subbands. 4. The method for allocating time-frequency resources in a wireless communication system according to claim 1, wherein said step B comprises: allocating the entire working bandwidth as distributed transmission subbands, or allocating the entire working bandwidth as centralized transmission subbands Subband. 5. The method for allocating time-frequency resources in a wireless communication system according to claim 4, wherein said step B comprises: allocating only main frequency subbands or only subfrequency subbands to the same data block. 6. The method for allocating time-frequency resources in a wireless communication system according to claim 1, wherein said step A comprises: when the number of main frequency subbands increases, under the premise of not affecting interference coordination, reserving The main frequency subband when the number of main frequency subbands is small is used as a new main frequency subband. 7. The method for allocating time-frequency resources in a wireless communication system according to claim 1, wherein the step A includes: selecting one subband or more than one uniformly distributed subbands as the main frequency of the cell Subband. 8. A device for allocating time-frequency resources in a wireless communication system, characterized in that the device comprises: The main and sub-band division module is used to divide the working bandwidth into more than one sub-band, and each cell selects at least one sub-band as the main frequency sub-band of the cell, and the remaining part is used as the sub-frequency sub-band of the cell; The transmission subband division module is used to allocate the main frequency subband of each cell to the distributed transmission or centralized transmission of the cell, and assign the sub-frequency subband of each cell to the distributed transmission or centralized transmission of the cell; The main and sub-band division module is connected to the transmission sub-band division module. 9. The time-frequency resource allocation device in the wireless communication system according to claim 8, characterized in that: The transmission subband division module is used to allocate all main frequency subbands as dispersed transmission subbands, and allocate all subfrequency subbands as concentrated transmission subbands. 10. The time-frequency resource allocation device in the wireless communication system according to claim 8, characterized in that: The transmission subband division module is used to allocate all main frequency subbands as concentrated transmission subbands, and allocate all subfrequency subbands as scattered transmission subbands. 11. The device for allocating time-frequency resources in a wireless communication system according to claim 8, characterized in that: The transmission subband division module is used to allocate the entire working bandwidth as dispersed transmission subbands, or to allocate the entire working bandwidth as concentrated transmission subbands. 12. The device for allocating time-frequency resources in a wireless communication system according to any one of claims 8-11, wherein the wireless communication system is a multi-carrier wireless communication system. 13. A base station, characterized in that the base station comprises the device for allocating time-frequency resources in the wireless communication system according to any one of claims 8-11. 14. A wireless communication system, characterized in that the system includes a base station and a mobile station communicating with the base station, Wherein the base station includes the time-frequency resource allocation device in the wireless communication system according to any one of claims 8-11, and the base station is used to allocate the main frequency sub-band, sub-frequency sub-band, centralized transmission and Notify the mobile station of the time-frequency resource information of the distributed transmission; The mobile station is configured to adjust a time-frequency position for receiving information according to the time-frequency resource information.

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