WO2012003695A1

WO2012003695A1 - Method for allocating downlink resources and base station

Info

Publication number: WO2012003695A1
Application number: PCT/CN2010/079520
Authority: WO
Inventors: 何哲
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-09
Filing date: 2010-12-07
Publication date: 2012-01-12
Also published as: CN102316593A

Abstract

A method for allocating downlink resources and a base station are disclosed by the present invention. Wherein, the method for allocating downlink resources includes that the base station determines a frequency interference level of a terminal based on parameters information reported by the terminal(S402), wherein, the parameters information include Carrier to Interference plus Noise Ratio (CINR), Received Signal Strength Indication (RSSI), and strength of neighbor cell signals received by the terminal; based on the frequency interference level of the terminal the base station allocates downlink resources to the terminal according to a predetermined strategy (S404), wherein, the predetermined strategy includes that the downlink resources allocated to the terminal with the highest frequency interference level in different sectors of the base station are not reused. With the present invention, the neighbor interference of the terminal located at the cell edge can be avoided, thus the user experience can be improved.

Description

The present invention relates to the field of communications, and in particular to a downlink resource allocation method and a base station. BACKGROUND OF THE INVENTION Orthogonal Frequency Division Multiplexing (referred to as

OFDM technology is a multi-carrier transmission technology, which is a high-speed transmission technology developed in the wireless environment by Multi-Carrier Modulation (MCM). The frequency response curve of the wireless channel is mostly non-flat. The OFDM technique divides a given channel into a plurality of orthogonal subchannels in the frequency domain, and modulates each subcarrier on each subchannel, and each subcarrier is transmitted in parallel. The World Interoperability for Microwave Access (WiMAX) system uses OFDM technology. The frame structure of Time Division Duplex (TDD) mode is as shown in Figure 1. The frame structure is a In the two-dimensional structure, the horizontal axis is composed of symbols in the time domain (Symbol), and the vertical axis is composed of subcarriers in the frequency domain. The Transmit/Receive Transition Gap (TTG) is the downlink subframe and adjacent. The interval between the bursts and the bursts. As shown in Figure 1, the downlink sub-frame preamble (Preamble) is the start, and the preamble is mainly used for physical layer synchronization and equalization. The preamble is followed by a Frame Control Header (FCH). In addition, if there is still a downlink mapping (DL-MAP) message in the current frame, the burst (Burst) carrying the DL-MAP message should be followed by the FCH. Moreover, if the downlink frame also needs to transmit an uplink mapping (UL-MAP) message, the UL-MAP message should also appear next to the DL-MAP message. The next frame portion is used to transfer data, which is composed of multiple bursts. Since frequency resources are a non-renewable scarce and expensive resource, efficient use of frequency resources is needed. Frequency reuse technology is a networking technology proposed to improve spectrum utilization and expand system capacity. The traditional frequency reuse technology can be divided into an inter-frequency multiplexing technology and an equal frequency multiplexing technology. The same frequency multiplexing technology can achieve a frequency reuse factor of 1, that is, cells within the coverage of the entire system use the same frequency band to serve users in the cell. The inter-frequency multiplexing technology divides thousands of cells in different frequency bands into one multiplexing cluster in the system. The frequency band occupied by the multiplexing cluster is all the frequency bands allowed by the system, and the whole system is composed of multiple multiplexing clusters. of. The same-frequency multiplexing technology has a high spectrum utilization and system capacity because the multiplexing factor is only 1. However, since all cells use the same frequency band, edge users are subject to the same frequency interference from other neighboring cells, and the communication quality is seriously affected, so it is rarely used in actual cellular systems. The inter-frequency multiplexing technology can suppress the same-frequency interference well because the physical location of the same-frequency cell is far apart. However, with the increasing number of wireless users, the system capacity of the inter-frequency reuse system has been greatly tested. In order to avoid the same-frequency interference between base stations, WiMAX operators may use the networking mode CxNxS as l x3Segment (segment) χ3, where C is the number of base stations in each cluster, and Ν is the total channel (or channel) of frequency reuse. Group), S is the number of sectors per base station. In this networking mode, the same-frequency interference between base stations can be better suppressed, but the spectrum utilization becomes very low, and the throughput is difficult to guarantee. When the frequency resource of the WiMAX operator is not rich, the CxNxS of the same-frequency networking mode is 1 x 1 x3 in the wireless communication network planning, where C is the number of base stations in each cluster, and N is the total frequency reuse. The number of channels (or channel groups), S is the number of sectors per base station. At present, in this networking mode, since the base station transmits the downlink signal on each of its sectors using the same carrier frequency, the user at the cell boundary is more disturbed by the neighboring area, thereby lowering the boundary. User experience. Although the network mode CxNxS is 1 x 3 Segment (segment) χ 3, the same-frequency interference between base stations can be better suppressed, but the spectrum utilization becomes very low, and the throughput is difficult to guarantee. With some of the above traditional frequency reuse methods, the terminal cannot obtain the required bandwidth resources to the utmost extent. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a downlink resource allocation method and a base station, so as to solve at least the problem that a user at a cell boundary is subject to a large interference in a neighboring cell when the intra-frequency networking mode is 1 χ 1 χ 3. According to an aspect of the present invention, a downlink resource allocation method is provided, including: determining, by a base station, a frequency interference level of the terminal according to the parameter information reported by the terminal, where the parameter information includes: CINR, RSSI, and the terminal receiving the neighboring area Signal strength; The base station allocates downlink resources to the terminal according to a preset frequency according to a frequency interference level of the terminal, where the preset policy includes: downlink resources allocated to terminals of a maximum frequency of 4 different levels in different sectors of the base station Do not reuse. Before the base station determines the frequency of the terminal, the method further includes: the base station setting N frequency interference levels according to the CINR, the RSSI, and the signal strength of the neighboring cell, where the frequency interference level is larger, the frequency interference level is The corresponding terminal is more affected by the neighboring area, where N is greater than or equal to 2 and less than or equal to the total number of users in any sector; the base station divides the downlink resources of each of the following sectors from the frequency domain and the time domain into N resource areas, each frequency is configured to correspond to a resource area The frequency of the resource regions corresponding to the maximum frequency of each sector is different from each other. The base station allocates downlink resources to the terminal according to the preset frequency according to the frequency interference level of the terminal. The base station allocates, to the terminal, a resource area corresponding to the frequency of the terminal. If the resource area corresponding to the frequency interference level of the terminal having a higher frequency interference level is idle, the downlink resource allocated by the base station to the terminal further includes the resource area corresponding to the high frequency. When N = 3, the N frequency interference levels are: advanced frequency interference, intermediate frequency interference, and low frequency. The base station divides the downlink resources of each sector into N from the frequency domain and the time domain. The resource region includes: the base station divides the symbol of the downlink subframe of each sector into two parts according to the time domain, wherein all symbols of the latter part on the entire frequency resource are the second resource region, and the second resource region and the intermediate frequency region are Corresponding to the interference, all symbols of the previous part on the entire frequency resource are divided into a first resource area and a third resource area in the frequency domain, and the first resource area corresponds to a low-level frequency interference, and the third resource area and the advanced frequency The disturbance level corresponds. The first resource region occupies 2/3 of the frequency resource in the frequency domain, and the third resource region occupies 1/3 of the frequency resource in the frequency domain. When N = 2, the N frequency interference levels are: advanced frequency interference and intermediate frequency interference; the base station divides the downlink resources of each sector from the frequency domain and the time domain into N resource areas including: The symbol of the downlink subframe of each sector is divided into two parts according to the time domain, wherein all symbols of the latter part on the entire frequency resource are the second resource area, and the second resource area corresponds to the advanced frequency interference, the former part is All symbols on the entire frequency resource are the first resource region, and the first resource region corresponds to the intermediate frequency. When N = 2, the N frequency interference levels are: advanced frequency interference and low frequency interference; the base station divides the downlink resources of each sector from the frequency domain and the time domain into N resource areas including: The symbols of the downlink subframes of the respective sectors are divided into two regions according to the frequency domain, and respectively correspond to the advanced frequency interference and the frequency of the gradation. When the base station is configured with a resource region corresponding to the frequency level, the method further includes: the base station configuring a corresponding transmit power for each frequency interference level, wherein the frequency interference level is smaller, and the frequency interference level corresponds to The smaller the transmission power. When the base station allocates downlink resources to the terminal according to a preset frequency according to the frequency interference level of the terminal, The method further includes: the base station acquiring the transmit power corresponding to the frequency interference level of the terminal, and using the transmit power as the power used to send the signal to the terminal. According to another aspect of the present invention, a base station is provided, including: a determination module, configured to determine a frequency interference level of the terminal according to the parameter information reported by the terminal, where the parameter information includes: CINR, RSSI, and the terminal receiving the neighbor a signal strength of the area; an allocation module, configured to allocate a downlink resource to the terminal according to a preset frequency according to a frequency interference level of the terminal, where the preset policy includes: a maximum frequency interference level for different sectors of the base station The downlink resources allocated by the terminal are not multiplexed. The foregoing base station further includes: a configuration module, configured to set N frequency levels according to CINR, RSSI, and signal strength of the neighboring cell, and divide downlink resources of each sector of the base station into N frequency and time domains. In the resource area, each frequency interference level is configured to correspond to one resource area, and the frequency of the resource area corresponding to the maximum frequency of each sector is different from each other, wherein the frequency is higher, and the frequency is more disturbed. The terminal corresponding to the level is more disturbed by the neighboring area, where N is greater than or equal to 2 and less than or equal to the total number of users in any sector. The configuration module is further configured to configure a corresponding transmit power for each frequency interference level, wherein the smaller the frequency interference level, the smaller the transmit power corresponding to the frequency interference level. According to the present invention, when the terminal allocates downlink resources for the terminal, the base station allocates downlink resources to the terminal by determining the frequency interference level of the terminal, where the base station is the terminal of the maximum frequency interference level under different sectors (ie, in the cell) Endpoints of the boundary) The allocated downlink resources are not multiplexed. In the present invention, since the downlink resources of the terminals at different cell boundaries are not multiplexed, the neighboring cells received by the terminals at the cell boundary are avoided, and the user experience is improved. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic structural diagram of a downlink physical frame in a TDD mode in a conventional WiMAX system; FIG. 2 is a schematic structural diagram of a base station according to Embodiment 1 of the present invention; FIG. 3 is a preferred embodiment of the present invention. Schematic diagram of the structure of the base station; 4 is a flowchart of a downlink resource allocation method according to Embodiment 2 of the present invention; FIG. 5 is a schematic diagram of a scenario of a 3-sector networking and N=3 in Embodiment 3 of the present invention; FIG. 6 is a third embodiment of the present invention. FIG. 7 is a schematic diagram of a three-sector networking in the third embodiment of the present invention and N=2; FIG. 8 is a schematic diagram of a three-sector group in the third embodiment of the present invention; FIG. 9 is a schematic structural diagram of a downlink frame in Embodiment 5 of the present invention; FIG. 10 is a schematic structural diagram of a downlink frame in Embodiment 5 of the present invention; FIG. 11 is a fifth embodiment of the present invention; A flow chart of processing a terminal of a frequency interference level of a different frequency in a medium base station; FIG. 12 is a flow chart of bandwidth allocation of a frame-by-frame scheduling of terminals of different frequencies of the frequency of the fourth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. Embodiment 1 FIG. 2 is a schematic structural diagram of a base station according to Embodiment 1 of the present invention. The base station includes: a decision module 10, configured to determine a frequency interference level of the terminal according to the parameter information reported by the terminal, where the parameter information includes: a carrier-to-interference plus noise ratio (CINR), a received signal strength indicator (RSSI), and a signal strength of the terminal receiving the neighboring area; an allocation module 20, configured to use the terminal The frequency interference level is allocated to the terminal according to a preset policy, where the preset policy includes: downlink resources allocated for terminals of the maximum frequency of the base station in different sectors are not multiplexed. In the foregoing base station provided by the first embodiment of the present invention, in order to avoid the interference of the neighboring area received by the terminal at the cell boundary, the allocating module 20 is the terminal that is most interfered by the neighboring area under different sectors (ie, the terminal at the cell edge) The allocated downlink resources are not multiplexed, so that the cell boundary can be avoided. The terminal between the terminal and the terminal of other cells is a thousand. FIG. 3 is a schematic structural diagram of a preferred base station according to Embodiment 1 of the present invention. The preferred base station is different from the base station shown in FIG. 2 in that the preferred base station further includes a configuration module 30, configured to perform CINR, RSSI, and neighboring cells. The signal strength is set to N frequency interference levels, and the downlink resources of each sector of the base station are divided into N resource regions from the frequency domain and the time domain, and each frequency interference level is assigned to one resource region, and each fan is The frequency of the resource region corresponding to the maximum frequency of the region is different from each other. The frequency of the frequency interference level is larger, and the terminal corresponding to the frequency interference level is more affected by the neighboring region, wherein N is greater than or equal to 2 Less than or equal to the total number of users in any sector. The determining module 10 can query the frequency interference level set by the configuration module 30 according to the CINR, the RSSI reported by the terminal, and the signal strength of the neighboring area received by the terminal, and determine the frequency interference level of the terminal, and the allocation module 20 resides in the terminal. The frequency of the frequency is 4, and the resource area corresponding to the frequency of the frequency is configured by the query configuration module 30, and the corresponding downlink resource is allocated to the terminal. Specifically, the allocating module 20 may use the resource area corresponding to the frequency of the terminal as the downlink resource of the terminal, or if the resource area corresponding to the frequency interference level higher than the frequency interference level is idle, The allocation module 20 can also allocate the partially free resources to the terminal. The preferred base station can improve the efficiency of downlink resource allocation. It should be noted that, although the preferred base station is configured by using the configuration module 30 to preset the configuration of the frequency interference level, the resource area, and the corresponding relationship between the frequency interference level and the resource area, the present invention is not limited thereto, and in practical applications, After the determining module 10 determines the frequency of the terminal, the allocation of the downlink resources is performed according to a preset setting policy. Preferably, the configuration module 30 is further configured to configure a corresponding transmit power for each frequency, wherein the smaller the frequency interference level, the smaller the transmit power corresponding to the frequency interference level. That is, in the embodiment of the present invention, the transmission power of the mobile terminal with a low frequency interference level is reduced, so that the coverage can be narrowed, and the interference of the '』 and the interval can be further reduced. Preferably, in the embodiment of the present invention, the base station can be partially frequency multiplexed (FFR, Fractional

Frequency Reuse) technology allocates downlink resources of terminals corresponding to the frequency interference level of each frequency, that is, terminals with lower frequency interference level (the terminals of this level are generally located in the cell center, the channel conditions are better, and the interference to other cells is not large Terminals are allocated on a multiplexing set with a frequency reuse factor of 1; for terminals with a higher frequency interference level (the terminals of this level are generally located at the cell edge, because the distance from the base station is relatively long, the channel conditions are relatively poor, and other The terminal 4 between the terminals of the cell is relatively large, and therefore, the partial-level terminal is allocated on the multiplexing set with the frequency reuse factor n (n≥2). This can reduce the interference and improve the utilization of the downlink spectrum. Embodiment 2 FIG. 4 is a flowchart of a downlink resource allocation method according to Embodiment 2 of the present invention. The method mainly includes the following steps: Step S402: The base station determines the frequency interference level of the terminal according to the parameter information reported by the terminal. The parameter information includes: CINR, RSSI, and the signal strength of the terminal receiving the neighboring cell; for example, the terminal reports the parameter information to the base station when the network accesses the network, and the base station determines according to the parameter information, or triggers in a period or an event ( For example, the signal of the terminal changes. The base station repeats S402 until the terminal exits the network. Specifically, the base station determines, according to the CINR, the RSSI of the terminal, and the signal strength of the neighboring area, the base station determines the signal strength of the base station and the interference of the neighboring area, thereby determining the frequency of the terminal. Thousands of 4 special grades. For example, the frequency can be divided into N levels: UserTypei, UserType ₂ , UserType ₃ ... , UserType _N , and the value of N is greater than or equal to 2 and less than or equal to the total number of users in any sector. The terminal of UserTypei is the smallest of the 4th of the neighboring area, the UserType is ₂ times..., and the terminal of UserType _{N is} the largest of the 4th of the neighboring station (that is, the outer ring user), that is, the frequency is higher. The terminal corresponding to the frequency interference level is gradually increased by the interference of the neighboring area. Step S404: The base station allocates downlink resources to the terminal according to a preset frequency according to a frequency interference level of the terminal, where the preset policy includes: downlink resources allocated by terminals of a maximum frequency interference level in different sectors of the base station. The frequencies are not the same (that is, the allocated downlink resources are not multiplexed). For example, the base station can plan the bandwidth from the frequency domain and the time domain to N shares, which represent different resource areas: ΰΐ^, which refers to the bandwidth used by the terminal of UserType _n , and the different frequencies correspond to the corresponding bandwidth. When the base station allocates downlink resources to the terminal, the base station allocates a bandwidth corresponding to the frequency interference level of the terminal to the terminal. In general, the fewer resources available to users with less interference, the less resources available to users with less interference, and the available bandwidth resources for terminals of the nth frequency interference level can be SfT, UserTypei terminals. All bandwidths can be used as SfT, while UserType _N users can only use bandwidth of size.

=1 In order to ensure coverage, the terminal of UserType _N (which can also be called the outer ring user) is most affected by the neighboring area, and the bandwidth of the terminal of UserType _N between the neighboring areas is different, that is, under lxl xS, S fans The outer ring users of the zone will not use the same bandwidth. For example, for the case of N = 3, the frequency of the terminal can be comprised of: the advanced frequency is 4 4 (corresponding to the outer ring user), the intermediate frequency is 4 4 (corresponding to the central user) and the 频率 frequency is 4,000. (corresponding to the inner ring user;), the base station may divide the symbol of the downlink frame into two parts according to the time domain: the former part is the inner and outer ring resources divided in the frequency domain, and the latter part is the central ring resource. Then, the subchannels of the inner and outer loops are divided according to the proportion of the frequency resources of the inner and outer loops, and are divided into two subchannel sets: respectively, an inner loop subchannel set and an outer loop subchannel set, wherein, preferably, the outer loop subchannel set is used. The 1/3 subchannel, the inner loop subchannel set uses the remaining 2/3 subchannels. Central users use all subchannels. The principle of the resource allocation: The outer ring user can only use the outer ring resource. The inner ring user can use the inner ring resource first, and the inner ring resource can continue to use the inner ring resource. This effectively improves the reusability of outer loop subchannel resources and reduces the waste of frequency band resources. For the case of N = 2, that is, when the inner ring users are all judged as the middle ring users or the middle ring users are all judged as the inner ring users. For only when the outer ring and ring users, namely ¹ ^ outside Central resources are divided in the time domain, then the outer ring bandwidth resources may be suffered by one thousand the same frequency interference to a minimum. When the decision is in the inner loop user user, that is, only when the outer and inner users, that is, only ^ ¹ users inside and outside the ring to be divided in the frequency domain, then you can achieve higher spectral efficiency but more serious interference with the frequency of one thousand . When a central user exists, the number of middle ring symbols for all sectors can be fixed with the same value. Further reduce the interference between Central Resources and internal and external resources. When the downlink resource is allocated in a downlink frame, the base station first divides the downlink resource into N Regions according to frequency division and time division; then the base station allocates the bandwidth of Region _{N to} the terminal of UserType _N until the bandwidth is allocated or the level is The terminal does not have a requirement; then the user of the UserType^ is allocated the bandwidth of the Region and the unused bandwidth of the Region _N until the bandwidth is allocated or the terminal does not have the demand; then the bandwidth of the Region _N-2 is allocated to the user of the UserType _N-2 and The unused bandwidth of Region _N _- i and Region _{N is} not allocated until the bandwidth is allocated or the terminal has no demand; the same is the analogy for the terminal of UserType _N- 3... UserType ₂ until the bandwidth is allocated or the terminal has no demand; Finally, resources are allocated for the UserTyp _ei terminal. As shown in the above process, the UserTyp _ei user can use the unallocated resources of the entire frame until the bandwidth is allocated or the terminal does not have a requirement, and the resource allocation ends. Preferably, when the base station configures a resource region corresponding to the frequency of the frequency, the base station will also use each frequency. The transmission power corresponding to the frequency interference level configuration, wherein the smaller the frequency interference level, the smaller the transmission power corresponding to the frequency interference level; for example, for the case of the above N=3, the outer ring, the middle ring, and the inner ring resource The relationship between the transmit power levels is P > P > P. Then, when transmitting the signal to the terminal, the base station transmits the signal by using the transmit power corresponding to the frequency interference level of the terminal, that is, reduces the transmit power to the inner ring terminal, reduces the coverage, and further avoids the interference. According to the above method provided by the second embodiment of the present invention, the frequency multiplexing can be determined according to the actual situation of the terminal, and the multiplexing factor can be 1 when the interference is small, and the interference is When large, the number of multiplexed resources is reduced to ensure the transmission quality of the terminal, and the spectrum utilization and system throughput can be improved. The third embodiment of the present invention describes the downlink resource allocation in the embodiment of the present invention by using a more common 3 sector (S=3) networking mode and a frequency interference level of N=3. FIG. 5 is a schematic diagram of a scenario of a 3-sector networking and N=3. According to the frequency interference level, in the third embodiment of the present invention, the terminals in one sector are classified into: an inner ring user, a middle ring user, and an outer ring user. The inner loop user is generally in the main lobe position of the antenna, which is relatively close to the station, and the path loss is small, and the interference of the neighboring area is also relatively small. Therefore, such users use a small power to transmit the downlink signal to the terminal side. There will be better quality; the users in the middle are relatively farther away from the inner ring users, and the road loss and the interference are relatively larger. Therefore, in order to ensure a certain signal quality, the base station transmits to the central users. The power is larger than the inner loop user; the outer loop users are divided into two types: one is close to the station but at the side lobe of the antenna. Although the signal strength is large, the distance from the antenna of the two segments is similar. The intensity of the disturbance is also very large, and the other is at the edge of the cell, the farthest from the station, the largest road loss, and the most disturbed by the neighboring area. According to the characteristics of the above three frequencies, the terminal distribution and the networking situation, the downlink frames of the three segments under one base station are divided into inner region (outside region), outer ring region or (outer). Region ) and Median Region 3 are shown in Figure 6. The inner ring user mainly uses inner ring resources, and the inner ring and outer ring resources can also be used when the inner ring and outer ring resources are idle. The inner loop user uses low power transmission to reduce the interference to the outer ring of the neighboring area. Central users mainly use the Central resources, and the outer ring resources can also be used when the outer ring resources are idle. Central users use lower power transmission to reduce the interference and also ensure a certain signal quality. the amount. The outer ring users are more disturbed by neighboring areas, and the interference to the neighboring areas is also larger. Therefore, only outer ring resources can be used, and higher power transmission is used to ensure coverage. It can be seen from FIG. 6 that the middle ring of the three segments in the same base station is offset from the outer ring and the inner ring in the time domain, and uses the same frequency resource; the outer ring of the three segments is frequency division, and there is no thousand between the outer rings. The inner loop uses all frequency resources except the inner and outer loop frequency resources. There are frequency overlaps between the inner loop and the inner loop between the inner and outer loops of the three segments. Between the three sectors, there is interference between the central ring and the central ring. Therefore, the users of the central ring need to control the carrier transmit power of the downlink central ring region, reduce the interference to the neighboring region and ensure a certain signal quality. There are also interferences between the inner and inner rings of the three segments, but the carrier of the inner ring should maintain a lower transmission power, and it can be seen from Fig. 5 that the distance between the inner rings is far, and therefore, between the sectors. The interference between the ring and the inner ring is small and can be ignored. At the same time, there are interferences between the inner and outer rings of the three segments. However, since the outer ring generally has higher power in the embodiment of the present invention, and the inner loop power is low and the coverage is small, the inner ring user of the current sector is Will not disturb the outer ring of another sector. In addition, since the user with excellent channel conditions can enter the inner loop, if there is no condition for the user to reach the inner loop, there is no inner loop user. Since the middle and outer rings of the three segments are time divisions, there is no interference. The fourth embodiment of the present invention provides a description of the downlink resource allocation in the embodiment of the present invention by using a more common 3-sector (S=3) networking mode and a frequency of 4th grade as the N=2 level. When S=3, N=2, that is, the user is only divided into the outer ring and the inner ring user. As shown in Figure 7, the scene is similar to the scene when N=3, and the frame structure also has some changes. The bandwidth resource is only divided into 2 In part, the frame structure is shown in Figure 8. The base station makes a judgment based on the downlink signal condition. After the terminal enters the network, according to the downlink CINR and RSSI information of the terminal at the base station and the signal strength of the neighboring station received by the terminal, it is determined which frequency of the low, medium, and high frequency the terminal is in the interference level, and then according to the frequency of the terminal. The interference level performs transmission power control and allocates downlink bandwidth resources according to the above strategy. Embodiment 5 The fifth implementation of the present invention is based on Wimax, S=3, N=3, that is, the 3-sector networking type 3 frequency is 4 The networking mode is described as an example. FIG. 9 is a schematic diagram of the networking mode in the embodiment. The downlink resources are also classified into three categories, and the downlink frame structure is as shown in FIG. 10 . FIG. 11 is a flowchart of processing, by the base station, for terminals of different frequency interference levels in the embodiment, which mainly includes the following steps: Step 1101: The terminal enters the network; Step 1102: The base station receives the downlink signal according to the terminal and the terminal receives The signal condition of the neighboring station determines whether the user is an inner ring, a middle ring or an outer ring user; Step 1103: The base station implements different power control policies and implements different downlink bandwidth allocation mechanisms according to the user type of the terminal; Step 1104: Whether the signal changes or the terminal's re-decision period is up, then go to step 4 to gather 1102, otherwise go to step 4 to gather 1105; step 4 gather 1105: whether the terminal is backed off, if the process ends, otherwise go to step 4 Figure 1 is a flow chart of bandwidth allocation of frame-by-frame scheduling for terminals of different frequencies in S=3 and N=3 under Wimax, which mainly includes the following steps: Step 1201, assigning an external ring user The bandwidth resource of the ring; Step 4 is 1202. If there is no need for the external ring user or the outer ring resource has been allocated, then go to step 4 to gather 1203, otherwise go to step 4 to gather 1201; Step 1203, The bandwidth resource of the central ring is allocated by the user in the middle ring and the bandwidth resource of the outer ring is not allocated. Step 1204, if there is no need for the central ring user or the central resource and the outer ring resource have been allocated, then go to step 4 to gather 1205, otherwise turn Step 4 gathers 1203; Step 4 gathers 1205, allocates the bandwidth resources of the inner ring for the inner ring users and the bandwidth resources that are not allocated by the outer and middle rings; Step 1206, whether there is no requirement of the inner ring users or the available resources have been allocated End, yes, the process ends, otherwise go to step 1205. From the above description, it can be seen that, in the embodiment of the present invention, the same-frequency networking mode CxNxS is lxl xS (S is the number of sectors per base station), and the frame structure of the downlink frame and the same station are planned. The frequency band used by the S segments is controlled, and by controlling the transmit power of the base station, the frequency of multiplexing can be adjusted according to the interference condition, and the frequency reuse factor can be up to 1 at the optimum time, while improving spectrum utilization and expanding system capacity. It also reduces the interference, improves the cell edge performance, improves the total throughput of the entire cell, and helps the operator to solve the problem that the coverage and throughput performance of the cellular network can be effectively improved when the frequency resources are limited. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A downlink resource allocation method, including:

The base station determines the frequency interference level of the terminal according to the parameter information reported by the terminal, where the parameter information includes: a carrier interference noise ratio CINR, a received signal strength indicator RSSI, and a signal strength of the terminal receiving the neighboring area;

The base station allocates downlink resources to the terminal according to a preset frequency according to a frequency interference level of the terminal, where the preset policy includes: a terminal with a maximum frequency interference level under different sectors of the base station The allocated downlink resources are not multiplexed.

The method according to claim 1, wherein, before the base station determines the frequency of the terminal, the method further includes:

The base station sets N frequency interference levels according to the CINR, the RSSI, and the signal strength of the neighboring cell, where the frequency interference level is larger, and the terminal corresponding to the frequency interference level is more affected by the neighboring area, wherein, N The number of users is greater than or equal to 2 and less than or equal to the total number of users in any of the sectors; the base station divides downlink resources of each of the lower sectors into N resource regions from the frequency domain and the time domain, and configures each frequency by 4 The grading level corresponds to one resource area, and the frequency of the resource area corresponding to the maximum frequency of each sector is different from each other.

The method according to claim 2, wherein the base station allocates downlink resources to the terminal according to a preset frequency according to a frequency interference level of the terminal, where the base station allocates the terminal to the terminal The frequency of the frequency is 4 and the level corresponds to the resource area.

The method according to claim 3, wherein if the resource region corresponding to the frequency of the frequency interference level of the terminal is idle, the downlink resource allocated by the base station to the terminal is further The resource region corresponding to the high frequency is included.

The method according to any one of claims 2 to 4, wherein the N frequency interference levels are: high frequency interference, intermediate frequency interference, and low frequency interference; The base station divides downlink resources of each of its lower sectors into N resource regions from the frequency domain and the time domain, including:

The base station divides the symbol of the downlink subframe of each sector into two parts according to the time domain, wherein all symbols of the latter part on the entire frequency resource are the second resource area, and the second resource The area corresponds to the intermediate frequency interference, and all symbols of the previous part on the entire frequency resource are divided into a first resource area and a third resource area in the frequency domain, where the first resource area corresponds to the gigabit frequency interference, and the third The resource area corresponds to the advanced frequency interference level.

The method according to claim 5, wherein the first resource region occupies 2/3 of a frequency resource in a frequency domain, and the third resource region occupies 1/3 of a frequency resource in a frequency domain.

The method according to any one of claims 2 to 4, wherein: N = 2, the N frequency interference levels are: advanced frequency interference and intermediate frequency interference; The downlink resources of each sector are divided into N resource areas from the frequency domain and the time domain, including:

The base station divides the symbol of the downlink subframe of each sector into two parts according to the time domain, wherein all symbols of the latter part on the entire frequency resource are the second resource area, and the second resource area corresponds to the advanced frequency interference The first part of the symbol on the entire frequency resource is the first resource area, and the first resource area corresponds to the intermediate frequency.

The method according to any one of claims 2 to 4, wherein: N = 2, the N frequency interference levels are: advanced frequency interference and low frequency interference; the base station will The downlink resources of each sector are divided into N resource areas from the frequency domain and the time domain, including:

The base station divides the symbols of the downlink subframes of the respective sectors into two regions according to the frequency domain, and corresponds to the high-frequency frequency of the advanced frequency.

The method according to any one of claims 2 to 4, wherein, when the base station is configured with a resource region corresponding to a frequency level, the method further includes:

The base station configures a corresponding transmit power for each frequency interference level, wherein the smaller the frequency interference level, the smaller the transmit power corresponding to the frequency interference level;

When the base station allocates the downlink resource to the terminal according to the preset frequency according to the frequency interference level of the terminal, the method further includes:

The base station acquires a transmission power corresponding to a frequency interference level of the terminal, and uses the transmission power as power used to transmit a signal to the terminal.

10. A type of base station, including:

The determining module is configured to determine a frequency interference level of the terminal according to the parameter information reported by the terminal, where the parameter information includes: a carrier interference noise ratio CINR, a received signal strength indicator RSSI, and a signal that the terminal receives the neighboring area strength; The allocation module is configured to allocate a downlink resource to the terminal according to a preset frequency according to a frequency interference level of the terminal, where the preset policy includes: a maximum frequency of 4 for different sectors of the base station The downlink resources allocated by the level terminals are not multiplexed.

The base station according to claim 10, wherein the base station further comprises:

The configuration module is configured to set N frequency levels according to the signal strengths of the CINR, the RSSI, and the neighboring cells, and divide the downlink resources of each sector of the base station into N resource regions from the frequency domain and the time domain. Each of the frequency interference levels is configured to correspond to one resource region, and the frequency of the resource region corresponding to the maximum frequency of each sector is different from each other, wherein the frequency interference level is larger, and the terminal corresponding to the frequency interference level is The greater the interference from the neighboring area, where N is greater than or equal to 2 is less than or equal to the total number of users under any of the sectors.

The base station according to claim 11, wherein the configuration module is further configured to configure a corresponding transmit power for each frequency interference level, wherein the smaller the frequency interference level, the corresponding transmit of the frequency interference level The smaller the power.