WO2010072019A1 - Procédé pour mettre en oeuvre une transmission et une réception multipoint coordonnées de liaison montante par la combinaison d'une coordination d'interférences intercellulaires - Google Patents

Procédé pour mettre en oeuvre une transmission et une réception multipoint coordonnées de liaison montante par la combinaison d'une coordination d'interférences intercellulaires Download PDF

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Publication number
WO2010072019A1
WO2010072019A1 PCT/CN2008/002147 CN2008002147W WO2010072019A1 WO 2010072019 A1 WO2010072019 A1 WO 2010072019A1 CN 2008002147 W CN2008002147 W CN 2008002147W WO 2010072019 A1 WO2010072019 A1 WO 2010072019A1
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WO
WIPO (PCT)
Prior art keywords
user
cell
data
edge
comp
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PCT/CN2008/002147
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English (en)
Chinese (zh)
Inventor
李晓辉
薛鑫
季清
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西安电子科技大学
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Publication of WO2010072019A1 publication Critical patent/WO2010072019A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays

Definitions

  • the invention belongs to the field of mobile communications. It relates to an uplink multi-point cooperation implementation method combining inter-cell interference coordination. On the basis of inter-cell interference coordination, the uplink throughput of the cell edge users is greatly improved by multi-point cooperation between multiple cells.
  • LTE-Advanced Long Term Evolution-Advanced
  • LTE-A Long Term Evolution-Advanced
  • CoMP Coordinatd Multi Point Transmission
  • Multi-point Collaboration Technology ⁇ 'J is one of its important candidate technologies, its main purpose is to improve cell edge throughput through multi-point collaboration.
  • Multi-point cooperation can be divided into multi-point cooperation between base stations and multi-point cooperation within base stations.
  • Multi-point coordination within a base station refers to users in each cell accessing the network through a site (SITE), and multiple sites can be managed by one base station.
  • the present invention is mainly directed to a multi-point cooperation mode in a base station, as shown in Fig. 1, but can be easily extended to a mode of cooperation between base stations.
  • Inter-Cell Interference Coordination is an important method for reducing co-channel interference of cell edge users.
  • SFR Soft Frequency Reuse
  • FFR Fractional Frequency Reuse
  • Coordination an important technology to improve cell edge user throughput and system throughput.
  • Figure 3 shows a frequency band division method that enables inter-cell interference coordination (ICIC). The edges of three cells use different frequencies, which reduces the edge interference of edge users. This ICIC solution solves the problem of co-channel interference between cells to a certain extent.
  • cell edge users use the same frequency, and edge users between two cells can improve performance by using coordinated multi-point transmission.
  • edge users between two cells can improve performance by using coordinated multi-point transmission.
  • there are many different frequency bands in the entire cell there is a problem that the frequency switching is too frequent for the mobile user.
  • the frequency band used by CoMP users for multi-point collaboration can no longer be used by the central user. If there are no multi-point cooperative users in the system or the cell does not support multi-point collaboration, it will cause waste of frequency resources.
  • An object of the present invention is to provide a frequency multiplexing method suitable for multi-point cooperation and frequency switching, which solves the deficiencies of the existing ICIC and CoMP combining methods described in the background art.
  • the technical solution of the present invention is:
  • the present invention is an uplink multi-point cooperation implementation that combines inter-cell interference coordination, and the special method is as follows: The method includes the following steps:
  • the station determines whether the user is an edge user or a center user by measuring the user's SINR (Signal to Interference plus Noise Radio), and allocates the working frequency band used by the user according to the ICIC band division method;
  • SINR Signal to Interference plus Noise Radio
  • the station or the base station determines whether the cell in which the user is located and whether its service supports CoMP. If CoMP is not supported, the data of the user is extracted by using a traditional linear or non-linear detection method. If CoMP is supported, the process proceeds to step 4);
  • the cell receives the transmitted data and processes the data.
  • the cell receives only the data sent by the edge user, it is determined whether the cell is the serving cell of the edge user. If the cell is not the serving cell of the edge user, that is, the cell is a coordinated cell, the data is transmitted to the serving cell of the edge user; if the cell is the serving cell of the edge user, the data transmitted by the coordinated cell is combined. Detection.
  • step 4 when the cell receives only the data sent by the central user, the data sent by the central user is detected and extracted according to a linear or non-linear processing method.
  • the above sites are multi-antenna.
  • the above user is a single antenna or multiple antennas; when multiple antennas, the user transmits by single stream or multiple streams.
  • the number of intra-frequency intra-cell users is single-user or multi-user.
  • the present invention adopts multi-point cooperation of sharing frequency resources between a cell edge user and a neighboring cell center user.
  • This multi-point cooperation mode first avoids the process of dividing a dedicated frequency band for multi-point coordinated users; secondly, it can utilize central user performance.
  • the performance of the edge user is improved by the interference cancellation, that is, the performance of the central user is better than that of the edge user, and the probability of correctly receiving the information is higher than that of the edge user, then the uplink of one cell edge user and the neighboring cell center user is the same frequency.
  • the effect of multi-point collaborative joint detection is better than that of edge users. Therefore, the present invention has the following advantages:
  • the present invention makes full use of the existing frequency soft reuse (SFR) scheme and is fully compatible with the existing SFR-based ICIC scheme. Since no additional frequency bands are allocated in the invention, the user can move freely between cells supporting multi-point cooperation and non-multi-point cooperation without requiring a new band configuration. Users who want multi-point cooperation do not need to consider whether the cell in which the cell and the neighboring cell support multi-point cooperation when allocating the frequency band, and only need to allocate the frequency band according to the SFR, which greatly simplifies the frequency band division process.
  • SFR frequency soft reuse
  • a multi-point cooperation mode in which a central user and an edge user share a frequency band resource between different cells is a multi-point cooperation mode in which a central user and an edge user cooperate with each other. While ensuring the performance of the cell center user, the performance of the cell edge user can be greatly improved. Due to the method that is fully compatible with ICIC, with partial power compensation technology, the signal strength of the edge users arriving at the site is often lower than that of the central user, and the performance of the central user is not increased compared with the case of not using multi-point cooperation. Impact.
  • Figure 1 (a) Schematic diagram of a multi-site coordinated working mode of two cells in the prior art
  • Figure 1 (b) Schematic diagram of a three-cell multi-point cooperative working mode in the prior art
  • FIG. 2 is a schematic diagram of a multi-point cooperative working mode based on the same frequency network (SFN) in the prior art
  • FIG. 3(a) is a schematic diagram 1 of a frequency band dividing method for inter-cell interference coordination in the prior art
  • FIG. 3(b) is an existing
  • FIG. 4 is a schematic diagram of multi-point cooperative frequency band division based on the same type of frequency band division in the prior art
  • FIG. 5 is a frequency band used in the multi-point cooperative working mode from the cell edge in the prior art; Schematic diagram of extracting the CoMP band;
  • Figure 6 is a schematic view of the method of the present invention.
  • Figure 7 (a) Cooperative mode of shared frequency band resources between central users and edge users between two cells;
  • Figure 7 (b) Cooperative mode of shared frequency band resources between central users and edge users between three cells;
  • Figure 8 (a) Neither of the three cells Schematic diagram supporting multi-point collaboration;
  • Figure 8 (b) Schematic diagram of the cell 3 in the three cells not supporting multi-point cooperation
  • Figure 8 (c) Schematic diagram of three cells supporting multi-point cooperation
  • Figure 8 (d) Schematic diagram of edge users supporting multi-point collaboration, central users not supporting multi-point collaboration;
  • Figure 9 Schematic diagram of user data processing procedures supporting multi-point collaboration.
  • the station determines whether the user is an edge user or a central user by measuring the SINR of the user, and allocates a working frequency band used by the user according to a method of frequency division of the ICIC;
  • the CoMP is divided into three cases, namely:
  • the cell receives only the data sent by the edge user, it determines whether the cell is the serving cell of the edge user. If the cell is not the serving cell of the edge user, the data is transmitted to the serving cell of the edge user; if the cell is the serving cell of the edge user, the data transmitted by the other coordinated cells is jointly detected.
  • the cell When the cell receives only the data sent by the central user, it detects and extracts the data sent by the central user according to the traditional linear or non-linear processing method.
  • the station is often multi-antenna to achieve interference cancellation in steps 3) and 4); the user can have single antenna or multiple antennas; when multiple antennas, users can adopt single stream and multiple streams Sending; The number of intra-frequency users in a cell can be single or multiple.
  • the present invention employs multi-point cooperation of sharing frequency resources between a cell edge user and a neighboring cell center user.
  • This multi-point collaboration method first avoids the process of dividing the dedicated frequency band for the multi-point cooperative users. Secondly, it can utilize the central user performance to improve the edge user performance, that is: the performance of the central user is better than that of the edge user, and the edge user Compared with the cooperation, the probability that the data is correctly received is higher, so that the interference of the central user to the edge user can be better offset in the uplink joint detection, so the cooperation effect is better.
  • Figure 8 (a) - (c) shows the transmission of user data from the user terminal to each site in several representative multi-point cooperative/non-multipoint cooperation modes, no matter which mode, the invention adopts The band division method remains unchanged.
  • Figure 8 (a) - (c) is mainly for the analysis of whether the site supports multi-point collaboration, and Figure 8 (d) considers the use of edge users.
  • Multi-point cooperation the central cell does not adopt multi-point cooperation -
  • each site independently decodes the data of each user, and does not require data transmission between sites;
  • cell 3 does not participate in multi-point cooperation, and cell 1 and cell 2 support multi-point cooperation. At this time, users and stations in cell 3 can cooperate with multi-point cooperation of cell 1 and cell 2.
  • the interaction between the cell 1 and the cell 2 needs to be performed, and the information of the interaction may be the data before decoding and the data after decoding.
  • Figure 8 (d) In the mode shown in Figure 8 (c), if all users collaborate, the amount of data transferred between sites is large, and the performance is improved less, so the more practical situation is Figure 8 (d), in which three cells participate. Multi-point collaboration, but the central user's data is only processed in its serving cell, no multi-point collaboration, only edge users participate in multi-point collaboration. Each cell extracts the central user data and performs interference cancellation, and then transfers the data of multiple coordinated users (either before or after decoding) between the sites.
  • Figure 9 shows the data transfer process for multi-point collaborative users in Figure 8 (d).
  • the prior art method can also implement CoMP, compared to the inventive method:
  • the multi-point collaboration function can be realized through steps 2) to 4), but it will cause great interference to the situation where multi-point cooperation is not supported.
  • CoMP can also be implemented in the scheme of dividing the special frequency band, but signaling for controlling the dedicated frequency band needs to be added in these steps, and the processing method of step 4) is different, the key is that CoMP and ICIC are incompatible, the user's Sending is not transparent.

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

Abstract

L'invention concerne un procédé pour mettre en œuvre une transmission et une réception multipoint coordonnées de liaison montante (CoMP) par la combinaison d'une coordination d'interférences intercellulaires (ICIC). Le procédé comprend les étapes suivantes : 1) un site détermine si un utilisateur est un utilisateur périphérique ou un utilisateur central par la détection d'un rapport de signal sur interférence plus bruit (SINR) de l'utilisateur, et attribue une bande de fréquence de travail utilisée par l'utilisateur selon une méthode de répartition de fréquences de l'ICIC ; 2) l'utilisateur transmet les données à la cellule selon la bande de fréquence de travail attribuée ; 3) le site détermine si la cellule auquel l'utilisateur se rattache ou le service de l'utilisateur prend en charge ou non la CoMP, et si aucun ne prend en charge la CoMP, la station de base extrait les données avec un procédé linéaire ou un procédé non linéaire, et si la CoMP peut être pris en charge, aller à l'étape 4) ; 4) la cellule reçoit les données transmises et traite les données. Le procédé garantit la compatibilité du plan CoMP et du plan ICIC, et peut augmenter le débit périphérique de la cellule et le débit moyen du système.
PCT/CN2008/002147 2008-12-26 2008-12-31 Procédé pour mettre en oeuvre une transmission et une réception multipoint coordonnées de liaison montante par la combinaison d'une coordination d'interférences intercellulaires WO2010072019A1 (fr)

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Application Number Priority Date Filing Date Title
CN200810236485.9 2008-12-26
CN2008102364859A CN101483873B (zh) 2008-12-26 2008-12-26 一种结合小区间干扰协调的上行多点协作实现方法

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