CN102802264B - Fractional frequency reuse type resource allocating method and device - Google Patents

Abstract

The present invention provides a resource allocation method and device for partial frequency multiplexing. The method includes: the base station acquires the uplink channel parameters reported by the terminal; The limit value determines whether to adjust the user attributes of the terminal, wherein the user attributes include central users and edge users; re-allocate frequency resources for terminals whose user attributes have been adjusted. Through the present invention, frequency multiplexing technology can be used for frequency-limited uplink frequency bands to effectively suppress co-channel interference, and furthermore, effective load balancing can be performed on full frequency band resources and partial frequency band resources.

Description

Resource allocation method and device for partial frequency reuse

technical field

The present invention relates to a wireless communication system, and more specifically, to a resource allocation method and device for partial frequency multiplexing.

Background technique

The new generation of mobile communication (beyond 3G/4G) will be able to provide a data transmission rate of up to 100Mbit/s, or even higher, and support services ranging from voice to multimedia services, including real-time streaming media services. The data transmission rate can be determined according to these services. The required rate is dynamically adjusted. Another feature of the new generation of mobile communications is low cost. To achieve high speed and large capacity on limited spectrum resources requires a technology with high spectrum efficiency. OFDM (Orthogonal Frequency Division Multiplexing) technology combines above features. OFDM technology is actually a kind of MCM (Multi-Carrier Modulation, multi-carrier modulation). Its main idea is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into transmission on sub-channels. Orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce the mutual interference between sub-channels. The signal bandwidth on each sub-channel is smaller than the relevant bandwidth of the channel, so each sub-channel can be regarded as flat fading, which can eliminate inter-symbol interference, and since the bandwidth of each sub-channel is only a small part of the original channel bandwidth, Channel equalization becomes relatively easy.

OFDM technology is a kind of multi-carrier modulation. Its multi-carriers are orthogonal to each other, which can efficiently use spectrum resources. In addition, OFDM divides the total bandwidth into several narrow-band sub-carriers, which can effectively resist frequency selective fading. With the rapid development of wireless communication, such as WIMAX (Worldwide Interoperability for Microwave Access) based on OFDM system, according to the statistics of WIMAX Forum (Forum), 455 WiMAX networks in 135 countries around the world have entered commercial use , and a large number of countries will issue WiMAX licenses one after another. The bandwidth resources of WiMAX licenses issued by various countries and regions are different. Some national licenses contain very rich bandwidth resources. For example, Sweden issued a 50MHz TDD (Time Division Duplexing) frequency band in the 2.5GHz band The license issued by Japan has a bandwidth of 30MHz; some national licenses contain very little bandwidth resources, for example, India only has a bandwidth of 20MHz, and a certain operator in Singapore only has a bandwidth of 12MHz. When WiMAX bandwidth resources are very limited, how to maximize the use of frequency resources and provide mobile cellular networks with the best capacity and coverage performance is an effective solution that operators expect major communication manufacturers to provide. In the case of limited frequency resources, it is still necessary to maintain a strong system capacity, which actually puts forward higher requirements for developers.

From the perspective of communication, the following parameters can be used to measure the system capacity of a communication system: (1) the maximum number of users who can access the system at the same time; (2) the average number of users who can access the system at the same time; (3) The average loadable traffic (kps) in the system, the number of users that the system can accommodate and the instantaneous peak rate are very important.

In recent years, the attention paid to the system capacity of downlink is obviously greater than that of uplink, but in some special scenarios, the requirement for uplink capacity is very large, such as wireless video surveillance scenarios. In recent years, wireless monitoring technology has been widely used. In the wireless monitoring system, the wireless monitoring center needs to obtain the video information of the monitored point in real time, and the video information must be continuous and clear. At wireless monitoring points, cameras are usually used to collect real-time on-site conditions. The cameras are connected through wireless video transmission equipment, and data signals are sent to the monitoring center through radio waves. This technology only requires uplink transmission of the equipment and does not require feedback from the monitoring center. A lot of downlink data. The advantage of wireless is that there is no need to dig trenches and bury pipes, which is especially suitable for places with long outdoor distances and decorations; in many cases, users are often limited by geographical environment and work content, such as special geographical environments such as mountains, ports and open land. , It will bring great inconvenience to the wiring project of wired network and wired transmission, and the construction period of using wired will be very long, or even impossible to realize. At this time, the use of wireless monitoring can get rid of the shackles of cables, and has the advantages of short installation period, convenient maintenance, strong capacity expansion, and rapid cost recovery. Wireless monitoring does not need to send a large amount of downlink data, but needs to upload a large amount of uplink data. In this case, how to achieve large system capacity at low cost and easily is an urgent problem to be solved.

For wireless communication products using the OFDM system, the uplink bandwidth is usually designed to be smaller than the downlink bandwidth in order to pursue a higher downlink rate. However, in many application scenarios, high-speed and large-capacity uplink is also required, as mentioned above Therefore, how to make the most effective use of spectrum resources and reduce hardware consumption under the limited uplink spectrum resources is of great practical significance.

The direct problem brought about by limited spectrum resources is co-frequency interference. Intercell interference (ICI) is an inherent problem in cellular mobile communication systems and an inevitable product of frequency reuse. Similarly, the cellular network of the mobile WiMAX system also needs to determine the frequency reuse mode and carry out frequency planning during network planning.

The data rate provided by the existing mobile cellular system (2G or 3G) is very different between the center of the cell and the edge of the cell. This is because the expected signal power inside the cell is large and the interference signal is small. The best choice is to use all frequency bands , it is not worth the candle to improve the signal-to-interference ratio by sacrificing bandwidth, so the natural idea should be to use a reuse factor of 3 at the edge of the cell, and use the same frequency reuse inside the cell. Fractional Frequency Reuse (Fractional Frequency Reuse) is to solve this problem best solution.

FFR is a commonly used frequency reuse technology, and it is also one of the most commonly used means to overcome co-channel interference. In the uplink of the wireless system, that is, adjacent sectors use the same frequency band, and users in the center of each cell can schedule all subcarrier frequencies. (Fm), while the edge users can only schedule part of the subcarrier frequencies (Fb), as shown in Figure 1, the users assigned to the central part can occupy the full frequency bandwidth, while the users at the edge of the three cells only occupy the part of the full bandwidth bandwidth.

At present, many companies adopt the traditional solution of FFR technology with complex power control. For example, Huawei Ericsson and other companies have proposed soft frequency reuse technology (SFR) based on partial power control, but this technology needs to dynamically adjust subcarriers and The ratio of the power threshold of the main carrier is adapted to the distribution of the load inside the cell and at the edge of the cell. Continuous dynamic adjustment of this solution brings high complexity to the implementation and will cause system instability.

Contents of the invention

The technical problem to be solved by the present invention is to provide a partial frequency multiplexing resource allocation method and device to effectively suppress co-channel interference by using frequency multiplexing technology for the uplink frequency band with limited frequency.

In order to solve the above technical problems, the present invention provides a partial frequency reuse resource allocation method, including:

The base station obtains the uplink channel parameters reported by the terminal;

According to the uplink channel parameter and the threshold value of the uplink channel parameter corresponding to the current user attribute of the terminal, decide whether to adjust the user attribute of the terminal, wherein the user attribute includes a central user and an edge user;

Frequency resources are re-allocated for terminals whose user attributes have been adjusted.

Further, the above method also has the following features: the reported uplink channel parameters include a modulation and coding scheme, and the threshold value of the uplink channel parameter corresponding to the user attribute includes an order threshold of the modulation and coding scheme corresponding to the user attribute.

Furthermore, the above method also has the following characteristics:

The order threshold of the modulation and coding mode corresponding to the user attribute includes the order threshold of the modulation and coding mode corresponding to the marginal user;

If the current user attribute of the terminal is an edge user, when the base station decides whether to adjust the user attribute of the terminal, it judges whether the order of the modulation and coding scheme reported by the terminal is greater than that of the modulation and coding scheme corresponding to the edge user If the order threshold is greater than, it is decided to adjust the user attribute of the terminal to be a central user.

Furthermore, the above method also has the following characteristics:

The order threshold of the modulation and coding scheme corresponding to the edge user includes a first threshold and a second threshold, wherein the first threshold is greater than the second threshold;

If the current user attribute of the terminal is an edge user, and the reported uplink channel parameters include virtual MIMO type information, then when the base station decides whether to adjust the user attribute of the terminal, the first threshold is used as the edge The order threshold of the modulation and coding method corresponding to the user.

Furthermore, the above method also has the following characteristics:

The threshold value of the uplink channel parameter corresponding to the user attribute includes the order threshold of the modulation and coding mode corresponding to the central user;

If the current user attribute of the terminal is a central user, when the base station decides whether to adjust the user attribute of the terminal, it judges whether the order of the modulation and coding scheme reported by the terminal is smaller than that of the modulation and coding scheme corresponding to the central user If the order threshold is less than, it is decided to adjust the user attribute of the terminal to be a marginal user.

Furthermore, the above method also has the following characteristics:

The order threshold of the modulation and coding scheme corresponding to the central user includes a first threshold and a second threshold, wherein the first threshold is smaller than the second threshold;

If the current user attribute of the terminal is a central user, and the reported uplink channel parameters include virtual MIMO type information, then when the base station decides whether to adjust the user attribute of the terminal, the first threshold is used as the central user The order threshold of the modulation and coding method corresponding to the user.

Further, the above method also has the following features: the step of the base station deciding whether to adjust the user attribute of the terminal further includes:

Determine whether the ratio of the number of center users to edge users after the decision exceeds the matching threshold, if so, adjust the user attributes of some terminals from center users to edge users, so that the ratio of the number of center users to edge users does not exceed the threshold. ratio threshold.

Further, the above method also has the following features: the adjustment of the user attributes of some terminals specifically includes:

The minimum guaranteed rate of service quality of each terminal is obtained, the terminals are sorted according to the minimum guaranteed rate of service quality, and the user attributes of one or more terminals ranked last are adjusted.

Further, the above method also has the following characteristics: before the base station obtains the uplink channel parameters reported by the terminal, it also includes:

Configuring the user attribute of the terminal as an edge user when the terminal initially accesses the cell.

In order to solve the above problems, the present invention also provides a device for allocating partial frequency reuse resources, which is applied to a base station, including:

An acquisition module, configured to acquire uplink channel parameters reported by the terminal;

A decision module, configured to decide whether to adjust the user attribute of the terminal according to the uplink channel parameter and the threshold value of the uplink channel parameter corresponding to the current user attribute of the terminal, wherein the user attribute includes central user and edge user;

The allocating module is used to re-allocate frequency resources for terminals whose user attributes have been adjusted.

Furthermore, the above-mentioned device also has the following characteristics:

The uplink channel parameter includes a modulation and coding scheme, and the threshold value of the uplink channel parameter corresponding to the user attribute includes an order threshold of the modulation and coding scheme corresponding to the user attribute.

Further, the above device also has the following features: the order threshold of the modulation and coding scheme corresponding to the user attribute includes the order threshold of the modulation and coding scheme corresponding to the edge user, and the current user attribute of the terminal is an edge user,

The decision-making module is specifically configured to determine whether the order of the modulation and coding method reported by the terminal is greater than the order threshold of the modulation and coding method corresponding to the edge user when deciding whether to adjust the user attribute of the terminal, such as greater than , then the decision to adjust the user attribute of the terminal to the central user, where,

The order threshold of the modulation and coding method corresponding to the edge user includes a first threshold and a second threshold, wherein the first threshold is greater than the second threshold, for example, the current user attribute of the terminal is an edge user, and the reported uplink channel parameters include virtual MIMO type information, the decision module uses the first threshold as the order threshold of the modulation and coding mode corresponding to the edge user when deciding whether to adjust the user attribute of the terminal.

Further, the above device also has the following characteristics: the threshold value of the uplink channel parameter corresponding to the user attribute includes the order threshold of the modulation and coding mode corresponding to the central user, and the current user attribute of the terminal is the central user,

The decision-making module is specifically used to determine whether the order of the modulation and coding method reported by the terminal is smaller than the order threshold of the modulation and coding method corresponding to the central user when deciding whether to adjust the user attribute of the terminal, such as less than , then it is decided to adjust the user attribute of the terminal to an edge user, where,

The order threshold of the modulation and coding method corresponding to the central user includes a first threshold and a second threshold, wherein the first threshold is smaller than the second threshold; if the current user attribute of the terminal is a central user, and the reported uplink channel parameters include virtual MIMO type information, the decision-making module uses the first threshold as the order threshold of the modulation and coding scheme corresponding to the central user when deciding whether to adjust the user attribute of the terminal.

Further, the above-mentioned device also has the following characteristics: the device also includes:

A configuration module, configured to configure the user attribute of the terminal as an edge user when the terminal initially accesses a cell.

Further, the above-mentioned device also has the following characteristics: the device also includes:

The balance module is used to judge whether the ratio of the number of center users and edge users exceeds the ratio threshold value after the decision-making. If it exceeds, the user attributes of some terminals are adjusted from center users to edge users, so that the center user and edge users The quantity ratio does not exceed the ratio threshold.

To sum up, the present invention provides a resource allocation method and device for partial frequency multiplexing. For the uplink frequency band with limited frequency, frequency multiplexing technology can be used to effectively suppress co-channel interference, and further, full frequency band resources and partial Effective load balancing of frequency band resources.

Description of drawings

Figure 1 is a schematic diagram of the FFR principle;

FIG. 2 is a schematic diagram of an apparatus for FFR resource allocation according to an embodiment of the present invention;

FIG. 3 is a flowchart of a partial frequency multiplexing resource allocation method according to the present invention;

FIG. 4 is a schematic diagram of a frequency spectrum of a WIMAX uplink frame according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

FIG. 2 is a schematic diagram of an apparatus for allocating FFR resources according to an embodiment of the present invention. As shown in FIG. 2, the apparatus of this embodiment is applied to a base station and may include:

An acquisition module, configured to periodically acquire uplink channel parameters reported by the terminal;

A decision module, configured to decide whether to adjust the user attributes of the terminal according to the uplink channel parameters and the threshold value of the uplink channel parameters corresponding to the current user attributes of the terminal, wherein the user attributes include central users and edge users;

The allocating module is configured to re-allocate spectrum resources for terminals whose user attributes have been adjusted.

In this way, when a terminal using the OFDM system is used, the frequency multiplexing technology can be used to effectively suppress co-channel interference for the uplink frequency band with limited frequency.

The uplink channel parameters in this embodiment include modulation and coding methods, and of course other parameters, such as BER (Bit Error Rate, bit error rate), received signal signal-to-interference ratio, CQI (channel quality indicator),

The uplink channel parameter in this embodiment includes a modulation and coding scheme, and the threshold value of the uplink channel parameter corresponding to the user attribute includes an order threshold of the modulation and coding scheme corresponding to the user attribute.

Wherein, if the order threshold of the modulation and coding scheme corresponding to the user attribute includes the order threshold of the modulation and coding scheme corresponding to the edge user, and the current user attribute of the terminal is an edge user, then

The decision-making module is specifically used to determine whether the order of the modulation and coding mode reported by the terminal is greater than the order threshold of the modulation and coding mode corresponding to the edge user when deciding whether to adjust the user attribute of the terminal, such as greater than , then the decision to adjust the user attribute of the terminal to the central user, where,

The order threshold of the modulation and coding method corresponding to the edge user includes a first threshold and a second threshold, wherein the first threshold is greater than the second threshold, for example, the current user attribute of the terminal is an edge user, and the reported uplink channel parameters include virtual MIMO type information, the decision module uses the first threshold as the order threshold of the modulation and coding mode corresponding to the edge user when deciding whether to adjust the user attribute of the terminal.

Wherein, if the threshold value of the uplink channel parameter corresponding to the user attribute includes the order threshold of the modulation and coding mode corresponding to the central user, and the current user attribute of the terminal is the central user, then

The decision-making module is specifically used to determine whether the order of the modulation and coding method reported by the terminal is smaller than the order threshold of the modulation and coding method corresponding to the central user when deciding whether to adjust the user attribute of the terminal, such as less than , then it is decided to adjust the user attribute of the terminal to an edge user, where,

The order threshold of the modulation and coding method corresponding to the central user includes a first threshold and a second threshold, wherein the first threshold is smaller than the second threshold; if the current user attribute of the terminal is a central user, and the reported uplink channel parameters include virtual MIMO type information, the decision-making module uses the first threshold as the order threshold of the modulation and coding scheme corresponding to the central user when deciding whether to adjust the user attribute of the terminal.

In a preferred embodiment, in addition to the modules in the above embodiments, the device may also include:

A configuration module, configured to determine that the terminal initially accesses a cell, and then configure the user attribute of the terminal as an edge user.

In a preferred embodiment, in addition to the modules in the above embodiments, the device may also include:

The balance module is used to judge whether the ratio of the number of center users and edge users exceeds the ratio threshold value after the decision-making. If it exceeds, the user attributes of some terminals are adjusted from center users to edge users, so that the center user and edge users The quantity ratio does not exceed the ratio threshold.

Wherein, the equalization module adjusts the user attributes of some terminals, specifically including: obtaining the minimum guaranteed rate of service quality of each terminal, sorting the terminals according to the minimum guaranteed rate of service quality, and sorting the last one or more The user properties of the terminal are adjusted.

In this way, the present invention can also effectively load balance the full frequency band resources and part of the frequency band resources. The so-called load balance is to make the allocation of load resources inside the cell reasonable, so as to maximize the utilization of frequency resources, that is to say, allocate them to the inner ring and outer ring. The load of the ring cannot be too much or too little, and the load balancing needs to be controlled by the balancing threshold.

In this way, the capacity of the uplink system can be increased through the device of the present invention without dynamic complex operations, delay waiting with power control is slowed down, and the complexity of hardware implementation is reduced at the same time.

Fig. 3 is the flow chart of a kind of partial frequency reuse resource allocation method of the present invention, as shown in Fig. 3, this method comprises the following steps:

S10. The base station acquires uplink channel parameters reported by the terminal;

S20. The base station decides whether to adjust the user attribute of the terminal according to the uplink channel parameter and the threshold value of the uplink channel parameter corresponding to the current user attribute of the terminal, wherein the user attribute includes a central user and an edge user;

S30. Reallocate spectrum resources for the terminals whose user attributes have been adjusted.

In this way, when a product using the OFDM system is used, the method of the present invention can effectively suppress co-channel interference by using the frequency multiplexing technology for an uplink frequency band with limited frequency.

In step S20, the step of the base station deciding whether to adjust the user attributes of the terminal further includes: judging whether the ratio of the number of center users and edge users after the decision exceeds the ratio threshold, and if it exceeds, the user attributes of some terminals Adjust from central users to marginal users, so that the ratio of the number of central users to marginal users does not exceed the ratio threshold.

In a preferred embodiment, the reported uplink channel parameters include a modulation and coding scheme, and the threshold value of the uplink channel parameter corresponding to the user attribute includes an order threshold of the modulation and coding scheme corresponding to the user attribute.

Wherein, if the order threshold of the modulation and coding method corresponding to the user attribute includes the order threshold of the modulation and coding method corresponding to the marginal user, then

If the current user attribute of the terminal is an edge user, when the base station decides whether to adjust the user attribute of the terminal, it judges whether the order of the modulation and coding scheme reported by the terminal is greater than that of the modulation and coding scheme corresponding to the edge user If the order threshold is greater than, it is decided to adjust the user attribute of the terminal to be a central user. in,

The order threshold of the modulation and coding scheme corresponding to the edge user includes a first threshold and a second threshold, wherein the first threshold is greater than the second threshold;

If the current user attribute of the terminal is an edge user, and the reported uplink channel parameters include virtual MIMO type information, then when the base station decides whether to adjust the user attribute of the terminal, the first threshold is used as the edge The order threshold of the modulation and coding method corresponding to the user.

Wherein, if the threshold value of the uplink channel parameter corresponding to the user attribute includes the order threshold of the modulation and coding mode corresponding to the central user, then

If the current user attribute of the terminal is a central user, when the base station decides whether to adjust the user attribute of the terminal, it judges whether the order of the modulation and coding scheme reported by the terminal is smaller than that of the modulation and coding scheme corresponding to the central user If the order threshold is less than, it is decided to adjust the user attribute of the terminal to be a marginal user. in,

The order threshold of the modulation and coding scheme corresponding to the central user includes a first threshold and a second threshold, wherein the first threshold is smaller than the second threshold;

If the current user attribute of the terminal is a central user, and the reported uplink channel parameters include virtual MIMO type information, then when the base station decides whether to adjust the user attribute of the terminal, the first threshold is used as the central user The order threshold of the modulation and coding method corresponding to the user.

In this way, the method of the present invention can also perform effective load balancing on the full frequency band resources and part of the frequency band resources, thereby maximizing the utilization of frequency resources.

The method of the present invention will be described in detail below with a specific embodiment.

In the uplink frame of any product that uses the OFDM system, for the convenience of explanation, the WIMAX uplink frame based on the IEEE802.16 protocol is cited as an example. As shown in Figure 4, the WIMAX uplink frame except for the Ranging (ranging) area is sent The Burst region of the data.

In the embodiment of the present invention, the inner ring (central area) indicates that users in the center can use all the frequency resources, and the outer ring (edge area) indicates that the system frequency resources are divided into three sections, and each base station uses part of the frequency band to reduce the number of base stations. In other words, the full frequency band of Fm is divided into three disjoint frequency bands (also called isolation bands). The frequencies Fb1, Fb2, and Fb3 shown in FIG. 1 use three different patterns to represent three disjoint frequency band resources, that is, the multiplexing factor mentioned in the background art is 3.

In the embodiment of the present invention, both the outer ring (edge users) and the inner ring (central users) are an attribute for users who access the cell, and the base station with this frequency reuse technology will When , set the properties of all terminals to 'outer ring'. After accessing for a period of time, according to the parameters reported by the terminal, such as modulation and coding scheme (MCS) (for example, BPSK (Binary Phase Shift Keying, binary phase shift keying), QPSK (Quadrature Phase Shift Keying, quadrature phase shift keying control), 16QAM (Quadrature Amplitude Modulation, phase quadrature amplitude modulation), 64QAM, etc.), virtual MIMO (Multiple-Input Multiple Output, multiple input multiple output) type, QoS (quality of service) and internal and external ring resource utilization and other parameters, To decide in which area the terminal transmits data more efficiently, and store the decision result. The so-called decision result means which users will switch from the attribute of the 'outer ring' to the attribute of the 'inner ring', and which users will continue to maintain the 'outer ring' ' attribute, which users need to switch from the attribute of 'inner ring' to the attribute of 'outer ring', etc., and pass this decision result to the balance module. Then the equalization module judges the user's inner and outer ring attributes according to the parameters such as the empirical threshold value and sorting user level, so as to make effective use of frequency resources and improve system capacity.

As shown in FIG. 4 , the vertical direction represents the entire frequency band, and the x area represents the division of the entire frequency band into three disjoint frequency band resources. When many users first access the network, the base station assigns the attribute to all users as 'outer ring', that is, in the three frequency bands of area x in Figure 3. Then, after the decision is made by the present invention, users whose user attributes in the 3 frequency bands are changed to 'inner ring' are switched to the inner ring, and users with inner ring attributes can use the full-band spectrum at this time, that is, enter the y area .

The following is the flow of the FFR resource allocation method of the embodiment of the present invention, which may include the following steps:

Step 101: All terminals are initially connected to the outer ring, and the user attribute of the terminal is configured as 'outer ring (edge user)', as shown in Figure 1, the frequency allocated to the terminal whose user attribute is the edge user can be Any one of the Fb1, Fb2, and Fb3 frequency bands, which area it falls into when accessing, will use the outer ring attribute of this area;

Step 102: After the terminal accesses for a period of time, the base station obtains the MCS and virtual MIMO types of all terminals at regular intervals, and decides whether to adjust the user attributes of the terminal, and updates the resource utilization of all inner and outer loops, that is, updates the number of central users and edge users .

The specific decisions are as follows:

If the terminal is currently in the outer ring and the user attribute is an edge user, it is judged whether the MCS order of the terminal is higher than the threshold value (Outter_MCS) under the outer ring area. If it is higher, the decision is made to adjust the user attribute of the terminal to central user. If the value of Outter_MCS in the current system is 16QAM-CTC (Convolutional Turbo Code, convolutional Turbo code); if the terminal enables the virtual MIMO transmission mode, and the reported uplink channel parameters include virtual MIMO information, the value of Outter_MCS is 64QAM -CTC.

If the terminal is currently in the inner ring and the user attribute is a central user, it is judged whether the order of the MCS reported by the terminal is lower than the threshold (Inner_MCS) under the inner ring area, and if it is lower, the decision is made to adjust the user attribute of the terminal to the edge user. If the value of Inner_MCS in the current system implementation is 16QAM-CTC; if the terminal enables the virtual MIMO transmission mode, and the reported uplink channel parameters include virtual MIMO information, the value of Inner_MCS is QPSK-CTC.

In summary, it can be seen that when judging the attributes of the inner and outer rings of the terminal, threshold values are set for both the inner and outer rings, and the inner and outer ring attributes of the final terminal are judged according to the threshold range, and the specific values of these thresholds It is the experience value accumulated through a large number of tests and simulations, which is of great practical value.

Step 103: judge whether the ratio of the number of central users and edge users exceeds the matching threshold, if exceeded, then obtain the Qos minimum guaranteed rate of each terminal, sort the terminals according to the size of the Qos minimum guaranteed rate, and rank the last one or The user attributes of multiple terminals are adjusted until the ratio of the number of central users to edge users does not exceed the ratio threshold.

Through a large number of tests, the ratio threshold is preferably a value within the range of [4:1, 8:1].

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.

The above are only preferred embodiments of the present invention. Of course, the present invention also has other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various Corresponding changes and modifications, but these corresponding changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Claims (12)

1. A resource allocation method for fractional frequency reuse comprises the following steps:

a base station acquires uplink channel parameters reported by a terminal;

deciding whether to adjust the user attribute of the terminal according to the uplink channel parameter and a threshold value of the uplink channel parameter corresponding to the current user attribute of the terminal, wherein the user attribute comprises a central user and an edge user;

reallocating frequency resources for the terminal with the adjusted user attribute;

the reported uplink channel parameters comprise modulation coding modes, and the threshold value of the uplink channel parameters corresponding to the user attributes comprises the order threshold of the modulation coding modes corresponding to the user attributes;

the order threshold of the modulation coding mode corresponding to the user attribute comprises the order threshold of the modulation coding mode corresponding to the edge user;

the order threshold of the modulation coding mode corresponding to the edge user comprises a first threshold and a second threshold, wherein the first threshold is larger than the second threshold;

if the current user attribute of the terminal is an edge user and the reported uplink channel parameter includes virtual multiple-input multiple-output type information, the base station takes the first threshold as an order threshold of a modulation coding mode corresponding to the edge user when deciding whether to adjust the user attribute of the terminal.

2. The method of claim 1, wherein:

if the current user attribute of the terminal is an edge user, the base station decides whether to adjust the user attribute of the terminal, and then judges whether the order of the modulation coding mode reported by the terminal is greater than the order threshold of the modulation coding mode corresponding to the edge user, and if so, then decides to adjust the user attribute of the terminal to be a center user.

3. The method of claim 1, wherein:

the threshold value of the uplink channel parameter corresponding to the user attribute comprises an order threshold of a modulation coding mode corresponding to a central user;

if the current user attribute of the terminal is a central user, and the base station decides whether to adjust the user attribute of the terminal, the base station judges whether the order of the modulation coding mode reported by the terminal is smaller than the order threshold of the modulation coding mode corresponding to the central user, and if the order of the modulation coding mode reported by the terminal is smaller than the order threshold of the modulation coding mode corresponding to the central user, the base station decides to adjust the user attribute of the terminal to be an edge user.

4. The method of claim 3, wherein:

the order threshold of the modulation coding mode corresponding to the central user comprises a first threshold and a second threshold, wherein the first threshold is smaller than the second threshold;

if the current user attribute of the terminal is a central user and the reported uplink channel parameters include virtual multiple-input multiple-output type information, the base station takes the first threshold as an order threshold of a modulation coding mode corresponding to the central user when deciding whether to adjust the user attribute of the terminal.

5. The method of any one of claims 1-4, wherein: the step of the base station deciding whether to adjust the user attribute of the terminal further comprises:

and judging whether the number ratio of the central users to the edge users after decision is over a matching threshold value, if so, adjusting the user attributes of part of the terminals from the central users to the edge users, and enabling the number ratio of the central users to the edge users not to exceed the matching threshold value.

6. The method of claim 5, wherein: the adjusting the user attributes of the partial terminals specifically includes:

and obtaining the minimum guaranteed service quality rate of each terminal, sequencing the terminals according to the minimum guaranteed service quality rate, and adjusting the user attributes of one or more terminals arranged at the end.

7. The method of any one of claims 1-4, wherein: before the base station acquires the uplink channel parameters reported by the terminal, the method further comprises the following steps:

and configuring the user attribute of the terminal as an edge user when the terminal initially accesses the cell.

8. An apparatus for fractional frequency reuse resource allocation, applied in a base station, comprises:

the acquisition module is used for acquiring uplink channel parameters reported by the terminal;

a decision module, configured to decide whether to adjust a user attribute of the terminal according to the uplink channel parameter and a threshold of the uplink channel parameter corresponding to the current user attribute of the terminal, where the user attribute includes a center user and an edge user;

the allocation module is used for reallocating the frequency resources for the terminal with the adjusted user attribute;

the uplink channel parameters comprise modulation coding modes, and the threshold values of the uplink channel parameters corresponding to the user attributes comprise order thresholds of the modulation coding modes corresponding to the user attributes;

the order threshold of the modulation coding mode corresponding to the edge user comprises a first threshold and a second threshold, wherein the first threshold is greater than the second threshold, if the current user attribute of the terminal is the edge user and the reported uplink channel parameter comprises virtual multiple-input multiple-output type information, the decision module takes the first threshold as the order threshold of the modulation coding mode corresponding to the edge user when deciding whether to adjust the user attribute of the terminal.

9. The apparatus of claim 8, wherein:

if the current user attribute of the terminal is edge user,

the decision module is specifically configured to, when deciding whether to adjust the user attribute of the terminal, determine whether an order of a modulation and coding scheme reported by the terminal is greater than an order threshold of a modulation and coding scheme corresponding to the edge user, and if so, decide to adjust the user attribute of the terminal to be the center user.

10. The apparatus of claim 8, wherein: the threshold value of the uplink channel parameter corresponding to the user attribute comprises an order threshold of a modulation coding mode corresponding to the central user,

if the current user attribute of the terminal is the central user,

the decision module is specifically configured to, when deciding whether to adjust the user attribute of the terminal, determine whether an order of a modulation and coding scheme reported by the terminal is smaller than an order threshold of a modulation and coding scheme corresponding to the central user, and if so, decide to adjust the user attribute of the terminal to be an edge user, where,

the order threshold of the modulation coding mode corresponding to the central user comprises a first threshold and a second threshold, wherein the first threshold is smaller than the second threshold; if the current user attribute of the terminal is a central user and the reported uplink channel parameters include virtual multiple-input multiple-output type information, the decision module takes the first threshold as the order threshold of the modulation coding mode corresponding to the central user when deciding whether to adjust the user attribute of the terminal.

11. The apparatus of claim 8, wherein: the device further comprises:

a configuration module, configured to configure the user attribute of the terminal as an edge user when the terminal initially accesses a cell.

12. The apparatus of any one of claims 8-11, wherein: the device further comprises:

and the balancing module is used for judging whether the number ratio of the center users and the edge users after decision making exceeds a matching threshold value, if so, adjusting the user attributes of part of the terminals from the center users to the edge users, and enabling the number ratio of the center users to the edge users not to exceed the matching threshold value.