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WO2007025466A1 - Procede de distribution de ressources de frequence temporelle a liaison ascendante et dispositif associe - Google Patents

Procede de distribution de ressources de frequence temporelle a liaison ascendante et dispositif associe Download PDF

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Publication number
WO2007025466A1
WO2007025466A1 PCT/CN2006/002206 CN2006002206W WO2007025466A1 WO 2007025466 A1 WO2007025466 A1 WO 2007025466A1 CN 2006002206 W CN2006002206 W CN 2006002206W WO 2007025466 A1 WO2007025466 A1 WO 2007025466A1
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WO
WIPO (PCT)
Prior art keywords
user
frequency
pilot
information
occupied
Prior art date
Application number
PCT/CN2006/002206
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English (en)
Chinese (zh)
Inventor
Rui Huang
Sha Ma
Bingyu Qu
Original Assignee
Huawei Technologies Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd filed Critical Huawei Technologies Co., Ltd
Priority to CNA2006800213923A priority Critical patent/CN101199147A/zh
Publication of WO2007025466A1 publication Critical patent/WO2007025466A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L25/022—Channel estimation of frequency response
    • 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
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se

Definitions

  • the present invention relates to wireless communication technologies, and more particularly to a method and apparatus for allocating uplink time-frequency resources.
  • multi-carrier technology has become a hotspot technology for broadband wireless communication.
  • the basic idea is to divide a wideband carrier into multiple subcarriers, and simultaneously transmit data on the multiple subcarriers.
  • the width of the subcarriers is smaller than the coherence bandwidth of the channel, so that on the frequency selective channel, the fading on each subcarrier is flat fading, which is suitable for high speed data transmission.
  • Multi-carrier technology usually uses frequency domain channel estimation techniques and frequency domain equalization techniques. Some single-carrier systems can also perform frequency domain channel estimation and frequency domain equalization processing by performing Fourier Transform (FFT) at the receiving end.
  • FFT Fourier Transform
  • Frequency domain channel estimation usually adopts coherent demodulation method based on auxiliary information.
  • the channel estimation method based on auxiliary information is to set some known pilot symbols at certain fixed positions of the signal at the transmitting end, and use these pilots at the receiving end. The symbol is used for channel estimation.
  • the pilot symbols include pilot symbols for the common pilot.
  • the channel estimates required for coherent demodulation of user data are typically obtained by the base station transmitting common pilots to all users.
  • the pilot symbols used by each user for channel estimation are dedicated follower pilots.
  • the overhead of the usual uplink dedicated pilot is relatively large.
  • the overhead of uplink control signaling is also considered.
  • wireless communication systems typically utilize methods such as resource scheduling to improve overall system performance. These methods also increase the overhead of system resources.
  • resource scheduling In a frequency reuse system, different users can be fixed in different children. With the band, as shown in Figure 3; along with the frequency and time of the wireless channel, the transmission resources of different users, including frequency resources and time resources, can be effectively arranged to obtain higher spectrum utilization efficiency and user satisfaction.
  • the base station is required to know the channel information of all frequency subbands of the user on the schedulable frequency band.
  • each participating user is usually required to send training information on all subbands of the schedulable frequency band, so that the base station can learn the channel conditions of each frequency subband and perform scheduling. This training information requires a relatively large overhead.
  • some physical layer uplink signaling brought by downlink data transmission also increases system overhead, and is reasonably multiplexed with uplink data and pilots, for example, feedback information (ACK) required by downlink HARQ.
  • ACK feedback information
  • the number of pilots inserted in the system is different, which can reduce the resource overhead of the system, and also needs to add some interactive signaling, which also needs to be reasonably complex with the uplink data and pilot. use.
  • the existing single-carrier technique by carrying the signal on the time domain waveform, makes the peak-to-average ratio of the transmit power relatively low.
  • the pilot and data are generally time-division multiplexed (TDM).
  • the frequency of each user data is divided into frequency division multiplexing (FDM) or time division multiplexing.
  • FDM frequency division multiplexing
  • Figure 2 and Figure 3 they are decentralized and centralized.
  • the pilot layout of the user frequency reuse taking 4 users as an example). In this pilot design approach, the pilot and data occupy the same frequency band and occupy all frequency resources within the frequency band.
  • the technical problem to be solved by the present invention is to provide a method and apparatus for allocating uplink time-frequency resources capable of effectively utilizing uplink time-frequency resources for multiplexing of uplink channels, improving system resource utilization, and ensuring channel estimation performance.
  • a method for allocating uplink time-frequency resources is provided, and the method includes:
  • the user pilot symbols and their data symbols are multiplexed in a time multiplexing manner, and in the multiplexing process, the frequency resources occupied by the user pilot symbols are allocated, so that the frequency resources occupied by the pilot symbols in their time resources are sparse The frequency resource occupied by the corresponding data symbol within its time resource.
  • the rate resource allocation is used to transmit information of other users or control information of the user.
  • the pilot symbols described by the user terminal are spaced apart to occupy frequency subcarriers within the frequency resource occupied by the data symbols.
  • the pilot symbols transmitted according to the allocation method are obtained by processing the pilot sequences, thereby having a comb spectrum characteristic in the frequency domain, and a set of comb teeth is obtained.
  • the pilot symbols respectively formed by the respective pilot sequences of each user are formed on the frequency bands occupied by the different user data symbols, and the pilot symbols have respective combs.
  • the spectral characteristics obtain a set of comb teeth of each user, and the frequency resources occupied by the data symbols are frequency resources of frequency bands occupied by respective data symbols of each user.
  • the pilot symbols respectively formed by the respective pilot sequences of each user are formed on the frequency bands occupied by the different user data symbols, and the pilot symbols have respective combs.
  • a spectral characteristic a set of comb teeth of each user is obtained, and the frequency resource occupied by the data symbol is a frequency resource of a frequency band occupied by each data symbol of each user;
  • the residual frequency resource of any one of the different users overlaps any of the extended comb teeth occupied by the entire system frequency band and the at least another user B pilot symbol of the different users.
  • the remaining frequency resources within the time resources of different user pilot symbols are allocated for transmitting information of the same other user.
  • the user data symbol is time-division multiplexed with at least two pilot symbols, so that all the guides
  • the frequency symbols have the comb spectral characteristics described, or such that a portion of the pilot symbols have the comb spectral characteristics.
  • the specific implementation of the remaining frequency resource allocation for transmitting information of other users or control information of the user is:
  • the information of other users or the control information of the user equally occupy the frequency subcarriers within the remaining frequency resources.
  • the specific implementation of the remaining frequency resource allocation for transmitting information of other users or control information of the user is:
  • the information of the other users or the control information of the user is inserted into the remaining frequency resources in such a manner that at least two transmitting/receiving data processing units are spaced apart.
  • the information required to measure the uplink channel condition required by the other user includes at least one of uplink frequency domain scheduling information, synchronization information, or adaptive pilot selection information.
  • the information used for uplink frequency domain scheduling includes at least one of subcarrier or subband measurement information for frequency domain scheduling and subcarrier feedback information for frequency domain scheduling.
  • the control information of the user includes at least one of user equipment measurement information, channel quality indication information, and downlink transmission related control information fed back by the user.
  • the present invention also provides an apparatus for allocating uplink time-frequency resources, the apparatus comprising at least a multiplexing and allocation module, the module is configured to:
  • the multiplexing and assigning module is configured to: cause the pilot symbols of the user terminal to be evenly spaced to occupy frequency subcarriers in the frequency resources occupied by the data symbols.
  • the multiplexing and allocation module is configured to:
  • the pilot symbols respectively formed by the respective pilot sequences of each user are formed on the frequency bands occupied by the different user data symbols, and the pilot symbols have respective combs.
  • the spectral characteristics obtain a set of comb teeth of each user, and the frequency resources occupied by the data symbols are frequency resources of frequency bands occupied by respective data symbols of each user.
  • the multiplexing and allocation module is configured to:
  • the pilot symbols respectively formed by the respective pilot sequences of each user are formed on the frequency bands occupied by the different user data symbols, and the pilot symbols have respective combs.
  • Characterizing the characteristics, obtaining a set of comb teeth of each user, the frequency resource occupied by the data symbol is a frequency resource of a frequency band occupied by each user data symbol;
  • the residual frequency resource of any one of the different users overlaps any of the extensions of the entire system band with the combs of at least one other user B pilot symbol of the different users.
  • the remaining resource allocation module is configured to: input information of the same other user.
  • the remaining resource allocation module is configured to:
  • the information of other users or the control information of the user is equally spaced to occupy frequency subcarriers within the remaining frequency resources.
  • the remaining resource allocation module is configured to:
  • the information of the other user or the control information of the user is inserted into the remaining frequency resource in a manner of spacing at least two transmitting/receiving data processing units.
  • the multiplexing and allocation module is configured to: frequency subcarriers in the frequency resource.
  • the method and device for allocating uplink time-frequency resources of the present invention can make the pilot occupy the frequency resource that is sparse than the data, and can effectively utilize the remaining frequency resources except the frequency resource occupied by the pilot symbol in the time resource of the pilot symbol. Transmitting the information of other users or the control information of the user, performing effective multiplexing of the pilot of the uplink channel and the user information, and more effectively utilizing the uplink resource while ensuring that the channel estimation performance and the data transmission performance of the user in the frequency domain are unchanged. Multi-user information reuse, thereby improving system resource utilization. In addition, it can ensure that the uplink user's pilot and data have better peak-to-average ratio characteristics.
  • FIG. 1 is a layout diagram of a common pilot on a downlink
  • FIG. 2 is a pilot arrangement diagram in a user mode frequency reuse in a distributed mode on the uplink
  • FIG. 3 is a pilot arrangement diagram in a user mode frequency multiplexing in a centralized mode on the uplink
  • FIG. 4 is an uplink time-frequency resource in the uplink mode of the present invention
  • FIG. 6 is a schematic diagram of pilot time-frequency resource allocation in a centralized mode user frequency multiplexing according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram showing the comparison of the sparsity degree of the pilot and the channel estimation performance according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of multiple pilot time-frequency resource allocation according to the present invention.
  • FIG. 9 is a schematic diagram of allocation of a sparse pilot of a user of the present invention that can be extended in frequency to other frequency bands;
  • FIG. 10 is a schematic diagram of an uplink time-frequency resource allocation apparatus according to an embodiment of the present invention.
  • the uplink time-frequency resource is implemented. The method includes the following steps:
  • Step 401 Determine to multiplex the user pilot symbols and their data symbols in a time multiplexing manner.
  • the multiplexing is implemented in the following manner: the user pilot symbol allocation is the same as the data symbol occupation. Band time resource;
  • Step 402 multiplex the user pilot symbols and their data symbols in a time multiplexing manner, and allocate frequency resources occupied by the pilot symbols in the multiplexing process, so that the allocated pilot symbols are in the
  • Step 403 is included to make full use of the above allocation results:
  • the information may also be used to transmit its own control information; for example, the remaining resources of the A user in the frequency band occupied by the user A may be used to transmit its own control information, and may also be used to transmit the B user's service information and control information.
  • Embodiment 1 user data in the same TTI (transmission time interval) and a pilot symbol are time division multiplexed:
  • the data and pilot of a certain user are separately multiplexed in each TTI, and one pilot is inserted in each TTI, so that the pilot and the data have the same sampling rate, occupying the same frequency band, but in the Within this band, the pilot symbols occupy less frequency resources than the data symbols. This can be done by the following process:
  • the sample in the block is compressed so that it changes from the time length Ts to the chip duration Tc, and then the block is repeated J times, and the obtained pilot symbols are:
  • L represents the number of repetitions of the block.
  • the pilot symbols after the repeated processing can be further expressed. Shown as: A set of comb-like spectral shapes, we call such a set of comb spectra as a set of comb teeth, as shown in Figure 5.
  • the comb-like frequency can have different frequency domain offsets in the frequency domain, and other sets of comb teeth are obtained, and the comb teeth of each group are staggered with each other, and the pilot can select any one of them. This can be done by: Selecting a specific set of phase vectors:
  • ⁇ denotes the phase vector and ⁇ denotes the phase rotation factor.
  • the obtained phase vector is multiplied by the above-mentioned data symbols by elements, and finally the pilot symbol of the user i is obtained as follows:
  • the minimum interval between the pilot symbol combs is smaller than the channel. Coherent bandwidth.
  • the density and spacing of the inserted pilots are not changed, but in the frequency domain, each pilot can be formed into a comb spectrum, as shown in Figures 5 and 6, thus making the pilot symbols at their time.
  • the frequency resources occupied by the resources are less than the frequency resources occupied by the corresponding data symbols in their time resources, and the remaining frequency resources are formed between the pilot symbols ⁇ 1 teeth.
  • the pilot symbols are evenly spaced to occupy frequency subcarriers within their frequency resources.
  • the pilot occupies the frequency resource as 1/ of the resources in the frequency band.
  • L 2
  • the pilot symbols occupy only the subcarriers with the even or odd number in the above frequency resources.
  • the information to be transmitted by other users may occupy the remaining frequency resources between the combs of the current user pilot symbols, and are frequency-multiplexed with the pilot of the user to be transmitted.
  • the user information may be inserted into the remaining frequency resource at intervals, or may be inserted unevenly.
  • the method of uniform insertion can still adopt the above-described method of forming a comb spectrum, except that a comb spectrum frequency domain offset different from the user pilot is used.
  • information of other users may be inserted into the remaining frequency resources at intervals of a plurality of transmission/reception data processing units as long as the requirements for transmitting user information can be satisfied.
  • Information about these other users includes but is not limited to other users
  • the required information for measuring the uplink channel condition includes, but is not limited to, uplink frequency domain scheduling information, synchronization information, and adaptive pilot selection information.
  • the information used for uplink frequency domain scheduling may include subcarrier or subband measurement information for frequency domain scheduling, subcarrier feedback information for frequency domain scheduling, and the like.
  • some of the user's own uplink control information may also be transmitted on the remaining frequency resources between the pilot symbol combs.
  • the control information of these users includes, but is not limited to, downlink transmission related control information fed back by the user, and the control information may be confirmation information related to the downlink hybrid retransmission request.
  • the user control information may also be user equipment measurement information, channel quality indicator information (CQI), and the like.
  • the pilot symbols can be formed into a comb spectrum characteristic in the frequency domain by a method in the frequency domain, and the specific steps include:
  • the sequence in the frequency domain is mapped to the N-point subcarrier, where (N is greater than M;) the frequency domain sequence of the N point is subjected to frequency-time IFFT conversion, and the pilot symbol is transmitted in the time domain.
  • the received signal is first demultiplexed to obtain data and pilots of the same user. Since the minimum spacing between the two pilot symbols in the frequency domain is smaller than the coherence bandwidth of the channel, the channel response at other locations can be obtained by interpolation. Therefore, after demultiplexing the pilot, the channel parameters of the current subcarrier of the pilot symbol can be estimated first, and then the channel parameters of all subcarriers where the data is located are estimated by interpolation. At the same time, other information of the multiplexing is recovered by separating the pilot comb spectrum.
  • the information can be demodulated with a pilot that is frequency-multiplexed with it, or demodulated by other non-coherent demodulation methods.
  • the information of other users is multiplexed, the information usually does not need to be demodulated (for example, information for channel condition measurement) or may be demodulated by other non-coherent demodulation methods.
  • Embodiment 2 In this embodiment, user data and multiple pilot symbols in the same TTI are time-multiplexed:
  • the channel estimation performance guarantees in some special application scenarios, in addition to the manners described in Embodiment 1, corresponding to different user data symbols.
  • the pilot symbols respectively form the respective comb-like words on the frequency bands occupied by the different user data symbols, and may perform the above operations only on some of the pilot symbols, and the other pilot symbols occupy the entire time resource. Frequency resource. In this way, on average, the frequency resource occupied by the pilot is still sparse than the frequency resource occupied by the data, and the remaining frequency resources formed between the pilot symbols of the pilot portion can be used to transmit information of other users or control information of the user. . For example, as shown in Fig.
  • a pilot is inserted in the head and tail of the TTI, respectively, in which the pilot of the head forms a comb spectrum. This situation can be used when the channel environment is poor and the coherence bandwidth of the frequency is relatively small.
  • the embodiment may also be adopted.
  • the above method may also be adopted, so that the comb spectrum pilots formed by the respective pilot symbols of the plurality of users on their respective frequency resources (bands) are in time. Up-aligned, the remaining frequency resources formed between the respective pilot symbol combs of these users can be used to transmit respective control information or information of other different users, or can be uniformly configured to transmit information of the same other user.
  • the bandwidth of the frequency band occupied by the plurality of users may be the same or different.
  • Figure 8 can be extended to the situation shown in Figure 9, where the user's sparse pilots can be extended in frequency to other frequency bands for channel measurements in other frequency bands.
  • the resources of other frequency bands occupied are the remaining frequency resources released by the pilot time of other users.
  • This extension can be achieved by a uniform spectrum of longer block lengths.
  • at least two pilots are inserted at different time positions in the TTI, where one pilot forms a spectrum on the entire frequency band (including subbands of other users), and other pilots occupy the user data. Frequency resources within the occupied subband.
  • a pilot is inserted in the head and tail of the TTI, wherein the pilot of the header forms a wider comb spectrum, and the frequency component of the same frequency band of the data portion performs channel estimation of the data block, and the data portion has a different frequency band.
  • the frequency resource performs channel quality measurement on the corresponding frequency band.
  • the example of FIG. 6 can be extended to a similar situation as shown in FIG. 9, that is, user data in the same TTI.
  • the extended comb spectrum can also be generated in the above manner, thereby implementing an embodiment of the present invention.
  • a plurality of different user information in step 403 is implemented, and the information and the pilot in step 402 of the other user itself are implemented by a unified comb spectrum.
  • an embodiment of the present invention further provides an apparatus for allocating uplink time-frequency resources.
  • the apparatus includes at least a multiplexing and allocation module, and the module is configured to implement the foregoing method.
  • frequency resource allocation function such that the frequency resources occupied by the pilot symbols in their time resources are neglected by the frequency resources occupied by the corresponding data symbols in their time resources. Source. Since the multiplexing and allocation functions implemented by the module are consistent with the multiplexing and allocation methods described in the above methods, the description will not be repeated here.
  • the apparatus for allocating an uplink time-frequency resource further includes a remaining resource allocation module, where the module is implemented to: use a frequency resource occupied by a pilot symbol in a time resource of a pilot symbol.
  • the remaining residual frequency resource allocation is used to transmit information of other users or control information of the user.
  • the remaining resource allocation function implemented by the module is consistent with the allocation method of the remaining resources already introduced in the above method. To save space, it will not be described in detail here.
  • the method for allocating uplink time-frequency resources of the present invention causes the pilot to occupy a frequency resource that is sparse than the data portion, implements a sparse resource distribution of the pilot in the frequency domain, and uses the time symbol of the pilot symbol to guide the information.
  • the present invention is applicable to any system in which system resources can be time-multiplexed and frequency-multiplexed.

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

Abstract

Ce procédé de distribution de ressource de fréquence temporelle à liaison ascendante consiste à: multiplexeur des symboles pilotes utilisateurs et des symboles de données par multiplexage temporel (401) et distribuer les ressources fréquence occupées par les symboles pilotes utilisateurs, de manière à rétrécir les ressources fréquences occupées par les symboles pilotes utilisateurs en termes de temps par rapport aux ressources fréquences correspondant aux symboles de données dans la même ressource temporelle (402). Dans la pratique, lorsqu'il est possible de garantir que les performances d'estimation du canal de domaine de fréquence utilisateur et les performances de transmission de données sont constantes, il est possible de multiplexer l'information multi-utilisateur au moyen d'une ressource de liaison ascendante, avec pour effet d'améliorer la vitesse d'utilisation des ressources du système. Par ailleurs, il est aussi possible de garantir que le pilote et les données de l'utilisateur de liaison ascendante présentent une meilleurs proportion moyenne de pic. L'invention concerne aussi un dispositif de distribution des ressources fréquences temporelles de liaison ascendante.
PCT/CN2006/002206 2005-08-28 2006-08-28 Procede de distribution de ressources de frequence temporelle a liaison ascendante et dispositif associe WO2007025466A1 (fr)

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CNA2006800213923A CN101199147A (zh) 2005-08-28 2006-08-28 一种上行时频资源的分配方法及装置

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CN200510036883.2 2005-08-28
CNA2005100368832A CN1921360A (zh) 2005-08-28 2005-08-28 一种上行时频资源的分配方法

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CN101378273B (zh) * 2007-08-28 2013-02-27 中兴通讯股份有限公司 一种周期反馈信道质量指数的方法
CN101426268B (zh) * 2007-11-02 2010-08-25 大唐移动通信设备有限公司 导频资源分配方法、系统和设备
PT2890201T (pt) * 2007-12-10 2016-12-12 ERICSSON TELEFON AB L M (publ) Programação aperfeiçoada num sistema celular
CN102088309B (zh) * 2009-12-04 2014-09-10 重庆无线绿洲通信技术有限公司 用于估计信道质量的参考信号生成方法及装置

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