WO2008119216A1 - Procédé de suppression d'interférence de fréquence commune dans un système de communication sans fil - Google Patents
Procédé de suppression d'interférence de fréquence commune dans un système de communication sans fil Download PDFInfo
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- WO2008119216A1 WO2008119216A1 PCT/CN2007/003570 CN2007003570W WO2008119216A1 WO 2008119216 A1 WO2008119216 A1 WO 2008119216A1 CN 2007003570 W CN2007003570 W CN 2007003570W WO 2008119216 A1 WO2008119216 A1 WO 2008119216A1
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- control module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Definitions
- the present invention relates to the field of wireless communications, and in particular, to a method for suppressing co-channel interference in a wireless communication system.
- the interferences of wireless and mobile communication systems mainly include co-channel interference, adjacent-frequency interference, out-of-band interference, and intermodulation interference.
- the co-channel interference of the system means that some or all cells in the network use the same frequency point for data transmission, and there is mutual signal interference between the cells.
- Co-channel interference can be generally classified into small-area interference, small-area interference, interference between different communication systems, interference between different operators, and interference caused by system equipment.
- the interference in the small area mainly includes multipath interference, far and near effects and multiple access interference.
- the generation of these disturbances is determined by the time-varying nature of the wireless channel and the delay and fading during electromagnetic wave propagation. It can be alleviated by modulation and demodulation technology, power control technology, and the like.
- Inter-Cell Interference is an inherent problem in cellular mobile communication systems.
- the traditional solution is to use frequency reuse.
- Common multiplexing coefficients are 1, 3, 7, and so on.
- a multiplexing factor of 1 means that neighboring cells use the same frequency resource, and the interference at the cell edge is very serious.
- a higher multiplexing factor (3 or 7) can effectively suppress ICI, but the spectral efficiency will be reduced to 1/3 or 1/7.
- Wireless mobile communication systems are increasingly demanding spectrum efficiency, and it is expected that intra-frequency networking can be performed to improve system efficiency.
- intra-frequency networking if the co-channel interference problem between cells cannot be effectively solved, the spectrum efficiency of the system will be reduced, the system coverage will be reduced, and the system traffic will be lost.
- Interference randomization can not reduce the energy of interference, but can randomize the interference into "white noise,” and thus suppress the harm of ICI, so it is also called “interference whitening”.
- the methods of randomization of interference include: scrambling, interweaving Address (IDMA) and frequency hopping.
- IDMA interweaving Address
- Interference coordination is also known as "soft frequency reuse, or” partial frequency reuse, IEEE802.20 MBFDD / MBTDD has adopted this technology, and LTE is also considering this method.
- This method divides the frequency resources into several multiplexed sets. Users in the cell center can use lower power transmission and reception. Even if they occupy the same frequency, they will not cause strong ICI, so they are allocated at the reuse coefficient.
- the interference cancellation technique is derived from a multi-user detection technique, which can demodulate and decode the signal of the interfering cell, and then copy and subtract the ICI from the cell.
- IDMA cancellation technology based on IDMA means that different interleaving patterns are generated by a pseudo-random interleaver and allocated to different cells.
- the receiver uses different interleaving patterns to deinterleave, and the target signal and the interference signal can be respectively solved, and then ICI elimination.
- This combination of technology and iterative receiver technology yields significant performance gains.
- the advantage of ICI cancellation compared with ICI coordination is that there is no limit to the frequency resources at the cell edge, and the cell edge spectral efficiency is 1 and the total spectral efficiency is 1. However, the computational complexity is high, increasing the processing power requirements of the receiver.
- the technical problem to be solved by the present invention is to provide a co-channel interference suppression method in a wireless communication system, which solves the problem of system performance degradation caused by inter-cell interference in a radio communication system in a wireless communication system.
- the present invention provides a co-channel interference suppression method in a wireless communication system, which is applied to a system including a main control module and at least two cell base stations, and includes the following steps:
- the main control module interacts with each cell base station to perform interference suppression information, and acquires interference terminal information of each cell;
- the main control module aggregates the interference terminal information of each cell, determines an interference suppression scheduling method, and sends the interference terminal information and the interference suppression scheduling method to the corresponding cell base station;
- the main control module is located in the master base station, or a separate server, or a higher level access gateway AGW.
- the method further includes:
- Each cell base station transmits downlink and uplink control information including scheduling information; each cell base station receives uplink data of a corresponding terminal in the own cell.
- the interference terminal information is calculated by the main control module by the base station reporting the interference time slot information and the scheduling information, or the base station directly reports the interference terminal information to the main control module.
- step (1) further comprises the following steps:
- the base station of each cell measures the interference of the uplink time slots, and reports the strong interference time slot information to the main control module;
- the base station reports the scheduled terminal sequence number mapping table of all the terminals to the main control module;
- the main control module counts the interference terminals of the neighboring cells corresponding to the base stations according to certain algorithms according to the information reported in steps ( la ) and ( lb );
- the strong interference time slot is a time slot corresponding to the maximum N interference power of each cell, or a time slot exceeding a certain interference power threshold in each cell, or a combination of two time slots;
- the algorithm for counting interference terminals in step (lc) is that the neighboring cell terminal scheduled in the strong interference time slot is an interference terminal, or is scheduled to be N times in a strong interference time slot within a certain duration.
- the terminal is an interference terminal.
- step (1) further comprises the following steps:
- the main control module broadcasts the strong interference time slot information to each base station
- each base station reports the sequence number of the scheduling terminal corresponding to the strong interference time slot to the main control module;
- the main control module statistically determines the interference terminals of the adjacent small cells corresponding to the base stations according to the information reported by the base station;
- the strong interference time slot is a time slot corresponding to the largest N interference powers of each cell, or a time slot exceeding a certain interference power threshold in each cell, or a combination of two time slots; wherein, the algorithm for counting interference terminals in step (1D) is that the neighboring cell terminal scheduled in the strong interference time slot is an interference terminal Or, for a certain duration, the terminal that has been scheduled N times in the strong interference slot is the interference terminal.
- the base station when each base station reports the information about the time slot to the main control module, the base station performs the time-frequency domain resource on the available bandwidth according to the time slot number.
- the terminal that exceeds a certain transmit power is defined as an interference terminal, and is reported to the main control module.
- the base station also reports the respective load information to the main control module
- the main control module summarizes the interference terminal information of each cell, and adds load information to determine an interference suppression scheduling method.
- step (2) further includes the following steps:
- the main control module summarizes the reporting information of each cell, including the interference slot information, or the scheduling information, or the interference terminal information, or the load information, or a combination thereof.
- the following scheduling method is adopted. One or a combination of them:
- the main control module formulates a scheduling policy according to the interference terminal condition of each cell, and the principle is to schedule interference terminals of different cells in different time/frequency domains;
- the main control module formulates a scheduling policy according to the interference terminal condition of each cell, and the principle is to schedule the interference terminal and the non-interfering terminal of different cells in the same time domain/frequency domain;
- Method 3 The main control module sets a cell with a smaller load that the interfering terminal may perform handover to a higher handover priority based on the load condition of each cell, and switches the interfering terminal to a cell with a smaller load to make it more Optional time-frequency domain bandwidth;
- Method 4 Each cell performs power reduction and rate reduction power control and link adaptation processing on an interfering terminal with a lower Qos requirement.
- the invention provides a co-channel interference suppression method in a wireless communication system, which may have Effectively overcome inter-cell co-channel interference, improve the reception performance of edge users, increase cell coverage, improve system traffic and spectrum efficiency.
- 1 is a network configuration diagram in a typical wireless mobile communication system
- FIG. 2 is a schematic diagram of scheduling of an OFDMA (Orthogonal Frequency Division Multiplexing) system of a base station BS1 at a certain time;
- OFDMA Orthogonal Frequency Division Multiplexing
- FIG. 3 is a schematic diagram of frame scheduling of an OFDMA system at a certain time by the base station BS2;
- FIG. 5 is a schematic diagram of a connection relationship between a base station of each cell and a main control module
- FIG. 6 is a schematic diagram of another connection relationship between each cell base station and a main control module
- FIG. 7 is a schematic diagram of information interaction mode 1 that may be adopted between the main control module and the base station;
- FIG. 8 is a schematic diagram of information interaction mode 2 that may be adopted between the main control module and the base station;
- FIG. 9 is a report of cell interference and scheduling information. schematic diagram. Preferred embodiment of the invention
- a wireless communication system typically a wireless communication system, can include the following components:
- At least two base stations each of which transmits control information (including scheduling information) within its corresponding cell range;
- FIG. 1 it is a network configuration diagram in a typical wireless mobile communication system in which two cells controlled by the base stations BS1 and BS2 are adjacent.
- terminals SS1 and SS2 are located in BS1.
- terminals SS3 and SS4 are located within the coverage of BS2.
- SS1 and SS3 are located at the edge of the cell, and data transmission is generally performed with a relatively large uplink transmission power. In the same frequency networking, more serious inter-cell interference will occur.
- FIG. 2 and 3 are schematic diagrams of frame scheduling of an OFDMA Orthogonal Frequency Division Multiple Access (OFDMA) system at a certain time, respectively, of a base station BS1 and a base station BS2.
- OFDMA Orthogonal Frequency Division Multiple Access
- FIG. 1, 2, and 3 it is assumed that the base stations BS1 and BS2 are co-frequency networking, and when the terminals SS1 and SS3 are respectively allocated on the uplink burst 1 (UL Burstl) of the base stations BS1 and BS2 for data transmission,
- the time-frequency regions of the uplink bursts of the two base stations have coincident portions, and the uplink signals of the two terminals SS1 and SS2 received by the two base stations BS at the location interfere with each other, resulting in a decrease in the received signal-to-noise ratio, thereby increasing Large bit error rate, reduced transmission efficiency, and even dropped calls. This ultimately reduces the coverage and flow of the entire system.
- the basic implementation steps are as follows:
- Step 401 Each cell base station sends downlink and uplink control information (including scheduling information); and uplink and downlink control information refers to information transmitted between the base station and the terminal.
- the control information related to interference suppression is mainly (1) downlink scheduling information sent by the base station; (2) uplink scheduling information sent by the base station; (3) request information sent by the base station to request the terminal to report relevant measurement information.
- Step 402 Each cell base station receives uplink data of a corresponding terminal in the local cell.
- the corresponding terminal refers to all terminals in the cell, and does not need to be configured; the uplink transmit power is information directly reported by the terminal; the uplink interference is calculated by the base station according to the uplink data; and the scheduling is performed by the base station.
- Step 403 The cell base station and the main control module exchange information about interference suppression, such as interference slot information, interference terminal information, scheduling information, and load information.
- the main control module counts each base station according to a certain algorithm according to the reported information.
- the interference slot information is calculated by the base station according to the uplink data; the interference terminal information can be obtained according to the transmission power report reported by the terminal; the scheduling information and the load information are information of the base station side itself.
- the base station in the range may request all or part of the reporting.
- Step 404 The main control module summarizes the reporting information of each cell, such as interference slot information, scheduling information, interference terminal information, and load information, and determines a recommended scheduling implementation principle according to a certain algorithm, so as to mitigate the interference situation as much as possible;
- Step 405 The main control module sends the interference terminal information and the scheduling method to the corresponding cell base station;
- the interference terminal information may be at least two types:
- (1) is the strong interference slot information in the following embodiments.
- interference terminals based on other information: such as terminal location, signal-to-noise ratio of the terminal, and power.
- Step 406 The base station base station performs actual scheduling according to the interference terminal information and the interference suppression scheduling method recommended by the main control module, and combines the scheduling requirements of the current cell to achieve the purpose of suppressing or eliminating the same frequency interference.
- FIG. 5 and FIG. 6 are respectively schematic diagrams of the connection relationship between the base station and the main control module of each cell, and each small cell base station can perform uplink and downlink message interaction with the main control module.
- the master module can be located in the master base station (shown in Figure 6), in a separate server (shown in Figure 5), or in a higher level control system such as the access gateway AGW.
- the information about the interference suppression performed by each cell base station and the main control module includes: a) interference slot information. ; b) scheduling information; c) interference terminal information; d) load information.
- a combination of a) and b) or c) may be used to determine an interference terminal; further, a scheduling method for determining interference suppression based on the interference terminal information, or based on the interference terminal information and d). That is, the interference terminal is determined according to the interference time slot information and the scheduling information, or only based on the interference terminal information. The former is calculated and obtained by the main control module, and the latter is reported by the base station to the main control module.
- Process 1 The information exchange between the base station and the main control module can be implemented through the following processes: Process 1, as shown in Figure 7:
- the base station of each cell measures the interference of the uplink time slots, and reports the strong interference time slot information to the main control module.
- the strong interference time slot can be defined as follows:
- Definition 1 A time slot corresponding to the maximum N interference powers of each cell
- Definition 2 or a time slot in which each cell exceeds a certain interference power threshold
- time slot here refers to the bandwidth resource of the scheduling.
- the base station reports the scheduled terminal sequence number mapping table of all the terminals to the main control module
- the main control module counts the interference terminals of the neighboring cells corresponding to the base stations according to the reported algorithms according to the reported information, wherein the determination of the interference terminals can be based on the following methods:
- Method 1 The neighboring cell terminal scheduled to be in the strong interference time slot is the interference terminal.
- Method 2 The terminal that has been scheduled N times in the strong interference time slot is the interference terminal within a certain duration.
- the base station reports the scheduled strong interference time slot information to the main control module
- the strong interference time slot can be defined as follows:
- Definition 1 A time slot corresponding to the maximum N interference powers of each cell
- Definition 2 or a time slot in which each cell exceeds a certain interference power threshold
- time slot here refers to the bandwidth resource of the scheduling.
- the main control module broadcasts information of a strong interference time slot (ie, the application time slot in FIG. 8) to each base station;
- Each base station reports the sequence number of the scheduling terminal corresponding to the strong interference time slot to the main control module; d) the main control module counts the neighboring cells corresponding to each base station according to the reported information Disturbance terminal,
- the determination of the interference terminal can be based on the following methods:
- Method 1 The terminal of the neighboring cell scheduled in the stronger trunk is the interfering terminal;
- Method 2 The terminal that has been scheduled in the stronger interference slot is the interfering terminal within a certain duration.
- the base station can also define a terminal that exceeds a certain transmit power as an interference terminal, and the upper terminal is given to the main control module.
- the base station can also report the load status to the main control module.
- each base station needs to report the information about the time slot to the main control module, and the base station can allocate the time-frequency domain resources on the available bandwidth according to the time slot, as shown in FIG.
- the base station BS When receiving the uplink data, the base station BS can simultaneously estimate the interference power in each time slot or burst. In this way, each base station can maintain a mapping table of slot resources and interference power.
- the base station can also obtain a mapping table of the slot resource and the terminal ID.
- the main control module summarizes the reporting information of each cell, such as interference slot information, scheduling information, interference terminal information, and load information, and determines a recommended scheduling implementation principle according to a certain algorithm to mitigate the interference situation as much as possible.
- the possible principles are as follows or a combination of these methods: Method 1: The main control module formulates a scheduling policy according to the interference terminal conditions of each cell. The principle is to schedule interference terminals of different cells in different time domains/frequency domains as much as possible to ensure the interference. In particular, the terminals do not interfere with each other.
- Method 2 The main control module formulates a scheduling strategy according to the interference terminal situation of each cell, and the principle is The interference between the interfering terminal and the non-interfering terminal of different cells is scheduled in the same time domain/frequency domain to avoid the power increase caused by the simultaneous scheduling of neighboring cells to interfere with the terminal, and the influence of co-channel interference is reduced.
- Method 3 The main control module sets a cell with a smaller load that the interfering terminal may perform handover to a higher handover priority based on the load condition of each cell, and switches the interfering terminal to a cell with a smaller load, so that the main control module can have more Multiple optional time-frequency domain bandwidths are more likely to avoid interference with other cell users through scheduling.
- Method 4 Each cell performs power reduction and rate reduction power control and link adaptation processing on the interfering terminal with lower Qos requirements, and reduces the interference impact on other cells.
- the present invention is directed to a method for suppressing co-channel interference in a wireless communication system due to a problem of system performance degradation caused by inter-cell interference in a wireless communication system, and proposes a solution for interference suppression.
- effective interference suppression technology reduce inter-cell interference, increase coverage and traffic, and improve the spectrum efficiency of the system.
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JP2010501352A JP5189160B2 (ja) | 2007-04-03 | 2007-12-12 | 無線通信システムにおける同一周波数干渉抑制方法 |
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CN2007100738010A CN101282566B (zh) | 2007-04-03 | 2007-04-03 | 一种干扰抑制方法 |
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Also Published As
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CN101282566B (zh) | 2011-10-26 |
CN101282566A (zh) | 2008-10-08 |
JP5189160B2 (ja) | 2013-04-24 |
JP2010524306A (ja) | 2010-07-15 |
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