WO2007128233A1 - Procédé d'estimation d'interférence, procédé d'attribution de ressources dans un système amrf et appareil associé - Google Patents

Procédé d'estimation d'interférence, procédé d'attribution de ressources dans un système amrf et appareil associé Download PDF

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Publication number
WO2007128233A1
WO2007128233A1 PCT/CN2007/001462 CN2007001462W WO2007128233A1 WO 2007128233 A1 WO2007128233 A1 WO 2007128233A1 CN 2007001462 W CN2007001462 W CN 2007001462W WO 2007128233 A1 WO2007128233 A1 WO 2007128233A1
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Prior art keywords
measurement result
interference measurement
interference
sub
result information
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PCT/CN2007/001462
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English (en)
Chinese (zh)
Inventor
Juejun Liu
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN2007800004049A priority Critical patent/CN101317412B/zh
Publication of WO2007128233A1 publication Critical patent/WO2007128233A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only

Definitions

  • the present invention relates to a frequency division multiple access system, and more particularly to an interference measurement method in a frequency division multiple access system, a resource allocation method based on interference measurement result information obtained by the method, and an interference measurement device and a resource allocation device.
  • 3GPP2 CDMA2000 1XEV-DO can further provide a competitive wireless access system in the next few years. But to maintain competitiveness in the next decade or decades, new wireless access technologies need to be introduced.
  • the industry has reached a preliminary agreement on the evolution of 3GPP2's air interface technology, which is divided into two phases. In phase one, multi-carrier EV-DO technology is adopted, and more consideration is given to compatibility, which is only a short-term evolution project. In phase two, more advanced technologies, such as OFDM (Orthogonal Frequency Division Multiplex) technology, MIMO (Multi-Input Multi-Output) technology, etc., can be introduced. Improving the spectrum efficiency and peak rate of wireless access systems is a long-term evolution plan of the 3GPP2 standard.
  • a conventional multi-carrier modulation system converts a high-speed data stream into a plurality of low-speed data streams by serial-to-parallel conversion, and then separately modulates the response carriers, thereby constituting a transmission system in which a plurality of low-rate data are transmitted in parallel.
  • a plurality of carriers for modulation appear as multiple non-overlapping subcarriers in a frequency band.
  • OFDM technology is a special multi-carrier modulation technology, with 1/2 overlap between sub-carriers, but kept orthogonal to each other, and can be separated by correlation demodulation techniques at the receiving end to form a more efficient data transmission system.
  • OFDM technology can greatly improve the spectral efficiency, and the DSP (Digital Signal Processor) hardware implementation using FFT (Fast Fourier Transform) and IFFT (Inverse Fast Fourier Transform) can greatly simplify the implementation of OFDM systems.
  • the OFDM system can also reduce inter-symbol interference and make full use of frequency selectivity. Due to the many advantages of OFDM technology, OFDM technology has been widely used.
  • the OFDMA (OFDM access) system utilizes OFDM technology as a multiplexing technique. That is, different users are distinguished by assigning different data subcarriers to different users. Since data transmission between users uses different mutually orthogonal subcarriers, data transmission between users does not interfere with each other.
  • the wireless environment of the user can be fully considered, the frequency selectivity can be fully utilized, and the data subcarriers most suitable for transmission can be allocated to the user, and the system capacity can be improved by optimizing the allocation scheduling algorithm.
  • the wireless access terminal In the reverse data transmission process of the OFDMA system, the wireless access terminal (hereinafter referred to as AT) constantly adjusts its own transmission power. The first is to ensure the quality of the reverse channel, so that the wireless access network (hereinafter referred to as AN) is reached. The signal has enough energy and the data can be correctly demodulated by the AN. At the same time, the AT also needs to ensure that its transmission power will not be too large, otherwise it will cause great interference to users of the external cell.
  • AN wireless access network
  • the allocated subcarrier resources of all ATs in the cell are orthogonal to each other, and no interference is formed, but the AT of the outer cell may use the same subcarrier resource, if the AT transmit power of the cell is too large, The cell AN can receive a strong interference signal, which will cause great interference to the data reception of the external cell. Therefore, an important issue in OFDMA systems is how to reduce the interference of the same frequency in the small interval. Therefore, in an OFDMA system, the power control of the reverse channel must take into account the problem of the external cell.
  • the current standard 802.20 provides a Delta-based reverse channel power control algorithm.
  • the power of the AT reverse channel is equal to the reverse reference channel power plus the traffic channel power gain.
  • the traffic channel power gain (RDCHGain) is continuously adjusted so that the transmission power of the AT reverse channel satisfies both the data transmission requirements of the AT itself and the interference of the external cell as much as possible.
  • the specific algorithm is as follows:
  • Each sector continuously measures the interference received in the entire frequency band, and quantizes the received interference into three levels: 0 - light interference; 1 - interference heavy; 2 - interference is heavy. Then, the interference situation (0 or 1 or 2) is broadcast to all ATs through the forward channel.
  • Each AT listens to the interference of the surrounding cells (OSI: other sector interference) and estimates its relative distance to the surrounding cells.
  • the relative distance is not the actual distance from the AT to the surrounding cell, but the loss ratio on the transmission path, that is, the transmission path loss value of the AT to the serving cell.
  • the ratio of the transmission path loss value to the AT of the surrounding cell can be used to indirectly reflect the distance of the AT from the surrounding cells.
  • the AT makes a comprehensive consideration based on the distance to the surrounding cells and the interference of the broadcast of the cell. For each cell in the surrounding area, the AT first calculates a threshold value DecisionThreshold. If the sector interference is small, the DecisionThreshold is proportional to the relative distance, which is inversely proportional to the existing RDCHGain.
  • the DecisionThreshold is proportional to the RDCHGain, which is inversely proportional to the relative Distance, if the interference is heavy, DecisionThreshold is a large constant. Then, based on each calculated DecisionThreshold, the AT decides whether to increase or decrease the power for the sector. For each sector decision, the weighted sum is obtained, and compared with a certain threshold, if it is higher than a certain threshold, the AT will uniformly decide to increase RDCHGain. If it is below a certain threshold, AT will reduce RDCHGain. Otherwise, RDCHGain remains. constant.
  • the meaning of the above processing is: If the AT is close to the surrounding sector, its own power is large, and the external cell interference is heavy, the AT should reduce the power; if the AT is far from the surrounding cell, the power itself is small, then the power should be increased. For other cases, the AT considers whether to reduce power or boost power according to certain rules.
  • each sector is measuring the received interference based on the entire bandwidth, for example, on a 5 MHz bandwidth, and the surrounding cells measure the interference received over the entire 5 MHz bandwidth, and then quantize into 3 files.
  • the cell AN only allocates part of the subcarrier resources to the AT. For example, a user only allocates 300 kHz bandwidth, which only accounts for 6% of the entire bandwidth, and actually The frequency resources used by the AT may be less sensitive to other sectors. Therefore, if the interference of the entire bandwidth is used for the power control reference, the result of the power control will be affected. For example, the AT itself can transmit at a higher power, and will not Interference is formed on the surrounding cells, but the reference to the entire bandwidth interference may cause the AT to fail to increase power.
  • the AT transmits data in the reverse direction
  • the power on the entire traffic channel frequency band is kept constant, that is, the transmission power on each subcarrier resource is the same.
  • the fading of each subcarrier frequency is different, which shows the characteristics of frequency selectivity.
  • Some subcarriers have large fading and some subcarriers have small fading.
  • some subcarriers have large interference to non-serving cells, and some subcarriers have less interference to non-serving cells. Therefore, the system with the same transmit power of all subcarrier resources is not optimal, and the characteristics of frequency selectivity cannot be fully utilized. Inter-cell interference mitigation is also not well achieved. Summary of the invention
  • An embodiment of the present invention provides an interference measurement method in a frequency division multiple access system, the system including a plurality of geographical areas, and for each of the geographic areas, the method includes the following steps: The available frequency band of the channel is divided into at least two sub-bands; the interference received by the sub-band is measured; and the interference measurement result information of the sub-band is transmitted.
  • Another embodiment of the present invention provides a resource allocation method based on interference measurement result information, the method comprising the following steps:
  • Another embodiment of the present invention further provides a resource allocation method based on interference measurement result information, the method comprising the following steps:
  • the terminal receives interference measurement result information of each sub-band sent from the area, where the sub-band is a sub-band divided on an available frequency band of the reverse channel outside the area; the interference measurement result that the terminal will receive The information is reported to the service area of the terminal.
  • the service area of the terminal determines the resources allocated for each terminal according to the interference measurement result information sent by each terminal in the area.
  • Another embodiment of the present invention provides an interference measurement apparatus, located in a wireless access network, including:
  • the interference measurement result sending unit is configured to send the interference measurement result information of the sub-band measured by the sub-band interference measuring unit.
  • Another embodiment of the present invention provides a resource allocation apparatus, located in a wireless access terminal, the apparatus includes:
  • Interference measurement result receiving unit used for receiving interference measurement results of each sub-band sent from the area
  • a power adjustment unit configured to adjust transmit power of the reverse data of the terminal according to the information of the sub-band interference measurement received by the interference measurement result receiving unit.
  • Another embodiment of the present invention further provides a resource allocation apparatus, located in a radio access terminal, the apparatus includes: an interference measurement result receiving unit, configured to receive interference measurement result information of each subband sent from an area;
  • the measurement result sending unit is configured to send the out-of-area sub-band interference measurement result information received by the interference measurement result receiving unit to the service area network side where the terminal is located.
  • the above embodiment of the present invention divides the available frequency band of the reverse channel into a plurality of sub-bands, so that the interference measurement result is more accurate, so that the terminal can obtain more accurate reverse channel interference information, and thus can perform based on the reverse channel interference information. More accurate resource allocation solves the problem of inaccurate interference measurement in the prior art, and the problem of unreasonable resource allocation, thereby realizing more accurate interference measurement in the frequency division multiple access system, and Reasonable resource allocation.
  • FIG. 1 is a diagram showing each sub-band interference situation monitored by the slave sector according to Embodiment 1 of the present invention
  • FIG. 2 is a diagram showing each sub-supplied from the sector of the present invention according to Embodiment 2 of the present invention
  • Figure 3 is a schematic structural diagram of an interference measuring device on the network side of the present invention
  • FIG. 4 is a schematic structural diagram of a resource allocation apparatus on the terminal side of the present invention.
  • FIG. 5 is a second schematic structural diagram of a resource allocation apparatus on the terminal side of the present invention.
  • This embodiment describes a process in which each sector in the frequency division multiple access communication system measures subband interference, transmits a measurement result, and a resource allocation process after the terminal receives the interference measurement result, and the specific steps include:
  • the sector divides the entire 5 MHz bandwidth into four subband sub-bands.
  • subbands When subbands are divided, they can be divided equally or unevenly. For example, divide the bandwidth of 5MHz into four subbands of 1.25MHz: subband 0, subband 1, subband 2, subband 3.
  • Inter-sector interference can be reflected by measuring the Interference over thermal noise power (IOT) received on each subband.
  • IOT Interference over thermal noise power
  • the subcarriers in subband 0 divided in the foregoing steps include subcarrier 0 to subcarrier 127; the subcarriers in subband 1 include subcarrier 128 - subcarrier 255; and subcarriers in subband 2 include subcarrier 256.
  • N 0 is the thermal noise power spectral density within the subband.
  • a reverse silence period can be set. When the reverse silence period, all ATs in the entire system service area, on the corresponding sub-band, will not transmit data to the base station in the reverse direction. Therefore, the base station can measure the received thermal noise power to obtain the thermal noise power spectral density in the corresponding sub-band.
  • the sector calculates the IOT on each subband and performs certain signal processing, such as filtering and quantization.
  • the purpose of the filtering process is mainly to eliminate jitter, mitigate the impact of sudden interference on the system, and examine the change of interference from a long-term perspective.
  • quantization process is to reduce the transmission overhead, for example, the following quantization process can be performed:
  • the above quantization process means that a threshold is set in advance, and when the IOT exceeds the threshold, the interference is considered to be severe, and the interference level is set to 1, otherwise it is set to 0.
  • i corresponds to a subband index
  • n represents an interference measurement period index.
  • IOTtarget is the level of interference the system wishes to achieve. (ie threshold).
  • the information of lbit is used to imply interference on each sub-band, with 0 indicating light interference and 1 indicating heavy interference. Of course, the finer the granularity of quantization, the more detailed the information that can be expressed, but it will increase the overhead and require a compromise.
  • the AN sends out the interference measurements for each subband.
  • the AN can transmit OSIjper_subband 0 of each subband through the overhead channel by means of broadcast, unicast or multicast.
  • the frequency of the subband interference information for the sector broadcast is controlled by the AN. For example, in order to reduce the overhead, it may be broadcast once in a period of time, and the period of the broadcast is determined by A (determined by the system parameter of the broadcast or determined by the protocol);
  • the interference information on each sub-band is broadcasted on each physical frame through the forward control channel, so that the AT of the adjacent sector can obtain the dry information on each sub-band of the sector in a more detailed manner, thereby performing more accurate and Fast power control reduces co-channel interference to this sector.
  • the AN can also notify the AT of the actual value of the IOT by in-band signaling.
  • F-OSI transmits 4 bits each time, for example, transmission 1101, indicating that sub-band0, sub-bandl, sub-band3 interference is heavy, and sub-band2 interference is light.
  • Each sector within the system measures the OSI information of the subbands within the sector and broadcasts over the overhead channel.
  • the AT listens to the overhead channel of the transmission of the OSI information from the outer sector, and acquires interference on each sub-band of the outer sector. As shown in Figure 1, the AT receives the OSI channels of three neighboring cells, and the sub-bands of all neighboring cells have relatively heavy interference, while the interference on sub-band2 is lighter.
  • the AT determines the transmit power based on the distribution of resources allocated to its own subcarriers.
  • the main principle is: when the interference on a certain sub-band received by the outer sector broadcast is large, the AT reduces the transmission power on the sub-band; when the interference is received on a sub-band that receives the broadcast of the outer sector In hours, the AT appropriately increases the transmit power on the subband. For example, there may be the following situations:
  • All subcarrier resources allocated for the AT belong to one subband.
  • the AT is based on the subband.
  • the outer sector interference information is power adjusted.
  • the AT determines the transmit power of its own subcarrier resources within the subband according to its own power capability within the subband, the distance from the outer sector, and the extent of the outer sector. For example, since the AT receives the subband interference information broadcast by the outer sector, the AT can adjust the transmit power on the subband by a certain algorithm, that is, the transmit power of the AT on the subband is reflected as the outer sector. With the function of the interference information, the AT can perform different power adjustments for different interference levels.
  • the purpose of the AT to adjust the transmit power on the subband is to ensure that the AT's own reverse transmit power satisfies the receive performance, and also to reduce the co-channel interference of the external sector as much as possible.
  • the AT adjusts the power according to the subband in which the transmission frequency is located and the corresponding subband interference outside the received area.
  • the AT may receive subband interference information of multiple adjacent sectors, as long as one phase is present.
  • the corresponding sub-band interference information of the neighboring sector appears to be large, so the AT should appropriately reduce its reverse transmit power on the sub-band, that is, reduce the transmit power gain of the reverse traffic channel.
  • the AT finds that the corresponding subband information of the neighboring sectors is small the AT can appropriately increase its own reverse traffic channel transmit power gain.
  • the step size that is specifically reduced or increased can be determined through negotiation between the AT and the AN, that is, the configuration parameters, or can be dynamically obtained according to a certain algorithm.
  • All subcarrier resources allocated for the AT belong to multiple sub-bands.
  • the AT considers the interference situation of each subcarrier resource in combination with the interference situation on each sub-band of the outer sector, and uniformly considers each The transmit power on the sub-band and the reverse data transmission. For example, due to different interference levels, multiple sub-bands can be used to determine different transmit powers for reverse data transmission.
  • the AT can report the level of the transmit power and the degree of interference on each sub-band to the AN for the subsequent scheduling assignment of the AN.
  • the AN requests the AT to report the interference information on each sub-band measured in a period of time by reporting the sub-band interference measurement request (SubbandOSIReportRequest) message, and the AT responds by the sub-band interference measurement report (SubbandOSIReport) message.
  • SubbandOSIReportRequest sub-band interference measurement request
  • SubbandOSIReport sub-band interference measurement report
  • the NumSubband indicates the number of subbands measured (the number of subbands may not be carried, but is broadcast in the system parameter message), and SubbandOSIValue then reports the interference information measured on each subband in turn.
  • the AN can obtain the interference information on each subband, so that the resource scheduling can be better.
  • the embodiment of the present invention can directly adopt the adjustment method of the transmission power in the prior art.
  • the embodiment of the present invention can also be considered as a single The interference received on the sub-band, you can use the existing power adjustment method.
  • an advantage of the embodiment of the present invention over the prior art is that the AT can obtain more accurate reverse channel interference information, thereby performing more precise power adjustment. Still taking Figure 1 as an example, in the prior art In the case, if only the interference of the entire bandwidth is measured, the AT may monitor that both sector1 and sector2 are interference heavy.
  • the AT allocates the sub-carrier resources of the sub-band at this time, the interference is not very heavy for the adjacent three sectors, and the prior art power control scheme may erroneously reduce the transmit power of the AT.
  • the transmission power of the AT can be adjusted more accurately.
  • This embodiment describes a process in which each sector in a frequency division multiple access communication system measures subband interference, transmits a measurement result, and a process in which the terminal reports the interference measurement result to the service area in which the terminal is located, and the specific steps include:
  • the sector divides the entire 5MHz bandwidth into 4 sub-bands, and measures the interference received on each sub-band, and broadcasts interference information to all ATs through the forward overhead F-OSI channel.
  • unicast or multicast can also be used.
  • the desired interference situation can be set. When the actual measured interference value is greater than the target value, the interference is heavy, otherwise the interference is light.
  • Use lbit information to indicate interference 0 means light interference, 1 means heavy interference.
  • F-OSI transmits 4 bits each time, for example, transmission 1101, indicating that sub-band0, sub-bandl, and sub-band3 are heavily interfered, and sub-band2 interference is light.
  • Each sector within the system measures the OSI information of the subbands within the sector and broadcasts over the overhead channel.
  • the AT listens to the OSI channel from the outer sector and acquires interference on each sub-band of the outer sector. In fact, it receives information from neighboring cells, because the mutual interference of distant cells is small and can be ignored. For example, an AT receives interference information on four subbands of a strong interfering sector B, as shown in Figure 2.
  • sector B has a relatively heavy dry 4 on sub-band0, sub-bandl and sub-ban2, and the interference on sub-band3 is lighter.
  • the AT After receiving the SubbandOSIReportRequest message sent by the AN, the AT will test for a period of time. The interference measurement result of each sub-band of the quantity is reported to the AN through the Subband OSIReport message, and the AN performs subsequent scheduling allocation.
  • the serving sector After the AT feeds back the interference measurement result to its serving sector through the inband signaling or the overhead channel, the serving sector allocates the subcarrier resource on the sub-band3 to the priority when the resource is allocated to the AT.
  • the AT After the AT feeds back the interference measurement result to its serving sector through the inband signaling or the overhead channel, the serving sector allocates the subcarrier resource on the sub-band3 to the priority when the resource is allocated to the AT. The AT.
  • the AT may first calculate the gain RDCHGain on each subband according to the power control, and then send the DCHGain to the monthly traffic fan through the SubbandOSIReport message. Which RDCHGain is larger, the serving sector can preferentially allocate the subcarriers on the corresponding subband to the AT.
  • the sector involved in the above embodiment may also be a geographical area such as a cell, which is determined according to the geographical area division of the communication system.
  • the application range of the above embodiment is not limited to the orthogonal frequency division multiple access system in the frequency division multiple access system.
  • FIG. 3 an interference measuring device on the network side according to an embodiment of the present invention is shown in FIG. 3.
  • the device is located in the AN, and the device includes a sub-band division unit, a sub-band interference measurement unit, and an interference measurement result transmission unit.
  • the subband division unit is configured to divide the available frequency band of each reverse channel in the local area into at least two subbands, and record the subband division condition;
  • the subband interference measurement unit is configured to subband the subband division unit.
  • the interference received is measured;
  • the interference measurement result sending unit is configured to send the interference measurement result of the sub-band measured by the sub-band interference measurement unit on the forward overhead channel.
  • the interference measurement result transmitting unit includes a signal processing module for performing signal processing on the interference measurement result.
  • the signal processing module may be an interference measurement information filtering module and/or an interference information quantization module or the like.
  • the embodiment of the present invention further provides a resource allocation device on the terminal side, as shown in FIG.
  • the apparatus includes an interference measurement result receiving unit and a power adjustment unit.
  • the interference measurement result receiving unit is configured to receive interference measurement results of each sub-band sent from the area;
  • the power adjustment unit is configured to adjust the transmit power of the reverse convergence of the terminal according to the measurement result of the sub-band interference received by the interference measurement result receiving unit.
  • the apparatus further includes an interference measurement result sending unit, configured to send the sub-band interference measurement result outside the area received by the interference measurement result receiving unit to the service area network side where the terminal is located.
  • another resource allocation apparatus includes an interference measurement result receiving unit and an interference measurement result sending unit.
  • the interference measurement result receiving unit is configured to receive the interference measurement result of each sub-band sent from the out-of-area; the interference measurement result is sent out, and the sub-band interference measurement result outside the area received by the interference measurement result receiving unit is sent to the The service area network side where the terminal is located.
  • the embodiment of the present invention measures the interference on each sub-band by dividing the reverse channel into multiple sub-bands, so that the AT can obtain more accurate reverse channel interference information, thereby making resource allocation more reasonable and better.
  • the embodiments of the present invention are compatible with the prior art, and the non-serving sector reports the interference condition through each sub-band, so that the AT can determine the transmit power according to the distribution of the sub-carrier resources and the sub-band interference conditions. AT reduces the interference of the external sector while reducing its performance as much as possible. At the same time, the transmit power is determined based on each sub-band, and the frequency selectivity can be fully utilized to save power.
  • resources allocated to the AT are allocated to the AT when the resource scheduling is performed.
  • the interference information fed back by the sub-band is considered when performing resource scheduling, avoiding the sub-band with large interference, and giving the AT interference to the light sub-band resource, thereby improving the performance of the AT and reducing the inter-cell interference.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé d'estimation d'interférence, un procédé d'attribution de ressources dans un système AMRF et les appareils associés. Le procédé comprend les étapes suivantes: le système comprend une pluralité de zones géographiques, à l'intérieur de chacune desquelles la bande de fréquences disponible de chaque canal retour de la zone est divisée en au moins deux sous-bandes; l'interférence des sous-bandes est estimée; les informations de résultat d'interférence des sous-bandes sont transmises. Etant donné que l'AT peut acquérir les informations d'interférence au niveau du canal retour de manière plus précise, l'AT peut déterminer les puissances de transmission et attribuer des ressources en fonction de chaque sous-bande, puis améliorer les performances et réduire l'interférence entre zones.
PCT/CN2007/001462 2006-04-29 2007-04-29 Procédé d'estimation d'interférence, procédé d'attribution de ressources dans un système amrf et appareil associé WO2007128233A1 (fr)

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