WO2010072019A1 - Method for implementing uplink coordinated multi point transmission and reception by combining inter-cell interference coordination - Google Patents
Method for implementing uplink coordinated multi point transmission and reception by combining inter-cell interference coordination Download PDFInfo
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- 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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- 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
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- 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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Abstract
A method for implementing uplink Coordinated Multi Point Transmission and Reception(CoMP) by combining Inter-Cell Interference Coordination(ICIC). The method includes steps as follow: 1) a site determines whether a user is an edge user or a center user by detecting a Signal to Interference plus Noise Radio(SINR) of the user, and allocates a working frequency band used by the user according to a frequency division method of ICIC; 2) the user transmits data to the cell according to the allocated working frequency band; 3) the site determines whether or not the cell that the user belongs to or the service of the user supports CoMP, and if no one supports CoMP, then the base station extracts data with a linear or a non-linear method, and if CoMP can be supported then going to step 4); 4) the cell receives the transmitted data and processes the data. The method guarantees the compatibility of the CoMP scheme and the ICIC scheme, and can increase the cell edge throughput and system average throughput.
Description
一种结合小区间干扰协调的上行多点协作实现方法 技术领域 Method for implementing uplink multi-point cooperation combined with inter-cell interference coordination
本发明属于移动通信领域。 其涉及一种结合小区间干扰协调的上行多点 协作实现方法。 在小区间干扰协调的基础上, 通过多个小区间的多点协作, 大大提高小区边缘用户上行链路吞吐量。 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.
背景技术 Background technique
在现行的 LTE (Long Term Evolution, 3G长期演进) 中, 小区边缘用户 的吞吐量远远低于中心区域用户的吞吐量。 为了提高小区边缘用户传输的数 据速率, 以及提高整个系统的吞吐量和平均吞吐效率, LTE-Advanced (Long Term Evolution- Advanced , 高级长期演进, 可以简写为 LTE-A) 将 CoMP ( Coordinated Multi Point Transmission and Reception, 多点协作) 技术歹 'J为其 重要的候选技术之一, 其主要目的是通过多点协作来改善小区边缘吞吐量。 In the current LTE (Long Term Evolution), the throughput of cell edge users is much lower than that of users in the central area. In order to improve the data rate transmitted by users at the cell edge and improve the throughput and average throughput efficiency of the entire system, LTE-Advanced (Long Term Evolution-Advanced, LTE-A) will be CoMP (Coordinated Multi Point Transmission). And Reception, Multi-point Collaboration) Technology 歹 'J is one of its important candidate technologies, its main purpose is to improve cell edge throughput through multi-point collaboration.
多点协作可以分为基站间多点协作和基站内多点协作。 基站内多点协作 指的是各小区内的用户通过一个站点 (SITE) 接入网络, 多个站点可以由一 个基站来管理。 本发明主要针对的是基站内多点协作模式, 如图 1 所示, 但 是可以很容易地扩展到基站间协作的模式。 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.
在多点协作 (CoMP)模式下, 用户在不同小区使用的是同频传输, 于是 可以使用同频网 (SFN) 来支持多点协作的工作模式, 如图 2所示。 In the multipoint coordination (CoMP) mode, users use the same frequency transmission in different cells, so they can use the same frequency network (SFN) to support the multi-point cooperation mode, as shown in Figure 2.
该方案存在的问题是: 并不是所有的用户和业务都希望采用多点协作的 模式; 网络侧也可能不支持多点协作, 因此这种方案在所有小区都能够支持 用户的多点协作传输时可以获取性能增益, 但是对于不支持多点协作的情况 而言, 会带来很大的小区间干扰, 这种干扰对小区边缘用户来说尤为严重。 The problem with this solution is: Not all users and services want to adopt the mode of multi-point cooperation; the network side may not support multi-point cooperation, so this solution can support multi-point coordinated transmission of users in all cells. Performance gains can be obtained, but for situations where multipoint coordination is not supported, there is a large inter-cell interference that is especially severe for cell edge users.
小区间干扰协调 (ICIC, Inter-Cell Interference Coordination)是一种用于 降低小区边缘用户同频干扰的重要方法。 目前, 软频率复用 (SFR, Soft Frequency Reuse) 或部分频率复用 (FFR, Fractional Frequency Reuse) 被看 作是实现 OFDM (Orthogonal Frequency Division Multiplexing,正交频分复用) 移动通信系统中小区间干扰协调 (ICIC)、 提高小区边缘用户吞吐量和系统吞 吐量的重要技术。
图 3给出了一种能够实现小区间干扰协调 (ICIC) 的频带划分方法, 其 中 3 个小区的边缘使用不同频率, 这样就减少了边缘用户的伺频干扰。 这种 ICIC方案在一定程度上解决了小区间同频干扰的问题。 Inter-Cell Interference Coordination (ICIC) is an important method for reducing co-channel interference of cell edge users. Currently, Soft Frequency Reuse (SFR) or Fractional Frequency Reuse (FFR) is considered as inter-cell interference in OFDM (Orthogonal Frequency Division Multiplexing) mobile communication systems. Coordination (ICIC), 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.
然而, ICIC中的小区边缘使用不同频带, 这与 CoMP中的频带共享是相 互矛盾的。于是就出现了一些 ICIC和 CoMP结合的方法,如图 4和图 5所示。 However, cell edges in ICIC use different frequency bands, which is contradictory to band sharing in CoMP. Then there are some ways to combine ICIC and CoMP, as shown in Figure 4 and Figure 5.
在图 4的方法中, 小区边缘用户使用相同的频率, 两个小区间的边缘用 户可以通过使用多点协作传输来提高性能。 但是由于整个小区中存在多种不 同的频带, 对于移动中的用户来说, 该方案存在着频率切换过于频繁的问题。 In the method of Figure 4, cell edge users use the same frequency, and edge users between two cells can improve performance by using coordinated multi-point transmission. However, since 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.
此外, 还存在一种从 ICIC小区边缘使用的频带中抽取一部分作为 CoMP 使用频带的方法, 如图 5所示, 这种方法的优点是仅仅采取了从小区边缘频 带中为 CoMP用户划分专用频带, 能够在避免非多点协作用户小区间干扰的 同时, 提供用户多点协作带来的好处。 但是这种方案也存在了较大的缺点: In addition, there is a method of extracting a part of a frequency band used by an ICIC cell edge as a CoMP use frequency band. As shown in FIG. 5, the advantage of this method is that only a dedicated frequency band is allocated for a CoMP user from a cell edge frequency band. It can provide the benefits of multi-point collaboration of users while avoiding interference between non-multipoint coordinated user cells. However, this solution also has major drawbacks:
1、 CoMP用户多点协作所需要使用的频带不能再被中心用户使用, 如果 系统中没有多点协作用户或者小区不支持多点协作时, 就会造成频率资源的. 浪费; 1. 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.
2、 需要划分专用频段, 不能完全兼容 ICIC和 CoMP方案。 2. It is necessary to divide the dedicated frequency band and it is not fully compatible with ICIC and CoMP solutions.
发明内容 Summary of the invention
本发明的目的在于提供一种适用于多点协作、 频率切换简单的频率复用 方法, 解决背景技术中所述的现有的 ICIC和 CoMP结合方法的不足。 SUMMARY OF THE INVENTION 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.
本发明的技术解决方案是: 本发明是一种结合小区间干扰协调的上行多 点协作实现, 其特殊之处在于: 该方法包括以下步骤: 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:
1 ) 站点 (SITE) 通过测量用户的 SINR ( Signal to Interference plus Noise Radio, 信干噪比)判断该用户是边缘用户还是中心用户, 并根据 ICIC的频带 划分方法分配该用户使用的工作频段; 1) The station (SITE) 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;
2) 用户根据分配的工作频段向小区发送数据; 2) The user sends data to the cell according to the allocated working frequency band;
3 ) 站点或基站判断该用户所在小区且其业务是否支持 CoMP, 如果不支 持 CoMP,则采用传统的线性或非线性检测方法提取该用户的数据,如果支持 CoMP, 则进入步骤 4); 3) 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);
4) 小区收到发送的数据, 对数据进行处理。
上述步骤 4)中当小区只收到边缘用户发送的数据,则判断该小区是否是 该边缘用户的服务小区。 如果该小区不是该边缘用户的服务小区, 即该小区 是协作小区, 则将数据传输到该边缘用户的服务小区; 如果该小区是边缘用 户的服务小区, 则结合协作小区传输来的数据进行联合检测。 4) The cell receives the transmitted data and processes the data. In the above step 4), when 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.
上述步骤 4)中当小区只收到中心用户发送的数据,则按照线性或非线性 处理方法检测并提取该中心用户发送的数据。 In the above 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.
上述步骤 4) 中当小区同时收到中心和边缘用户发送的数据, 贝 lj: In the above step 4), when the cell receives the data sent by the central and edge users at the same time, the shell lj:
4.1 ) 提取中心用户发送的数据, 如果该用户发送的数据正确接收, 则对 接收数据进行干扰抵消, 并将抵消干扰后的数据发送到边缘用户的服务小区, 用于边缘用户的联合检测; 4.1) extracting data sent by the central user, if the data sent by the user is correctly received, performing interference cancellation on the received data, and transmitting the data after canceling the interference to the serving cell of the edge user, for joint detection by the edge user;
4.2) 如果中心用户发送的数据错误, 则不向边缘用户的服务小区传输数 据, 该服务小区根据自己接收的数据或其他小区的数据进行联合检测。 4.2) If the data sent by the central user is incorrect, the data is not transmitted to the serving cell of the edge user, and the serving cell performs joint detection according to the data received by itself or the data of other cells.
上述站点是多天线的。 The above sites are multi-antenna.
上述用户是单天线或多天线; 多天线时, 用户采用单流或多流发送。 上述小区内同频用户数是单用户或多用户。 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.
本发明采用一个小区边缘用户与邻小区中心用户之间共享频率资源的多 点协作, 这种多点协作方式首先避免了为多点协作用户划分专用频带的处理 过程; 其次能够利用中心用户性能, 通过干扰抵消来提高边缘用户性能, 即: 中心用户的性能比边缘用户的性能好, 与边缘用户相比其信息正确接收的概 率更高, 那么一个小区边缘用户和邻小区中心用户同频的上行多点协作联合 检测带来的效果比边缘用户间协作的效果更好。 因此, 本发明具有以下优点: 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:
1、 保证了和 ICIC方案的兼容性: 本发明充分利用了现有的频率软复用 (SFR)方案, 和现有基于 SFR的 ICIC方案完全兼容。 由于发明中没有划分 额外的频带, 用户在不需要新的频带配置的情况下, 能够在支持多点协作和 非多点协作的小区间任意移动。 希望多点协作的用户在分配频带时无需顾及 所在小区和邻小区是否支持多点协作, 只需按照 SFR分配使用的频带, 大大 简化了频带划分过程。 1. Compatibility with the ICIC scheme is guaranteed: 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.
2、 采用不同小区间中心用户和边缘用户共享频带资源的多点协作模式: 本发明是一种小区间中心用户和边缘用户之间相互配合的多点协作模式, 在
保证小区中心用户性能的同时, 可以大大提高小区边缘用户的性能。 由于采 用了与 ICIC完全兼容的方法, 采用部分功率补偿技术, 边缘用户到达站点的 信号强度往往低于中心用户的信号强度, 与不采用多点协作的情况相比, 不 会增加对中心用户性能的影响。 2. A multi-point cooperation mode in which a central user and an edge user share a frequency band resource between different cells: The present invention 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.
3、 在不降低中心用户性能的前提下提高边缘用户的性能: 由于可以在中 心用户进行正确译码后抵消其对边缘用户的干扰, 边缘用户可以很好地利用 CoMP带来的好处, 通过译码前或译码后合并的方式来获取性能的增益。 附图说明 3. Improve the performance of edge users without degrading the performance of the central user: Since the central user can correctly decode the interference to the edge users after the correct decoding, the edge users can make good use of the benefits brought by CoMP. Combine the code before or after decoding to obtain the gain of performance. DRAWINGS
图 1 (a) 现有技术中两小区多点协作工作模式示意图; Figure 1 (a) Schematic diagram of a multi-site coordinated working mode of two cells in the prior art;
图 1 (b) 现有技术中三小区多点协作工作模式示意图; Figure 1 (b) Schematic diagram of a three-cell multi-point cooperative working mode in the prior art;
图 2是现有技术中基于同频网 (SFN) 的多点协作工作模式示意图; 图 3 (a) 是现有技术中小区间干扰协调的频带划分方法示意图一; 图 3 (b) 是现有技术中小区间干扰协调的频带划分方法示意图二; 图 4是现有技术中基于同种频带划分的多点协作频带划分示意图; 图 5 是现有技术中多点协作工作模式从小区边缘使用的频带中抽取 CoMP频带的示意图; 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;
图 6是本发明的方法示意图; Figure 6 is a schematic view of the method of the present invention;
图 7 (a) 两小区间中心用户和边缘用户共享频带资源的协作模式; 图 7 (b)三小区间中心用户和边缘用户共享频带资源的协作模式; 图 8 (a) 三个小区都不支持多点协作的示意图; 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;
图 8 (b)三个小区中小区 3不支持多点协作的示意图; Figure 8 (b) Schematic diagram of the cell 3 in the three cells not supporting multi-point cooperation;
图 8 (c)三个小区都支持多点协作的示意图; Figure 8 (c) Schematic diagram of three cells supporting multi-point cooperation;
图 8 (d) 边缘用户支持多点协作、 中心用户不支持多点协作的示意图; 图 9支持多点协作的用户数据处理过程示意图。 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.
具体实施方式 detailed description
参见图 6, 本发明方法的具体步骤如下: Referring to Figure 6, the specific steps of the method of the present invention are as follows:
1 ) 站点通过测量用户的 SINR判断该用户是边缘用户还是中心用户, 并 根据 ICIC的频带划分方法分配该用户使用的工作频段; 1) 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;
2)用户根据分配的工作频段向小区发送数据, 无需顾及该用户所在的小
区和邻小区是否支持 CoMP; 2) The user sends data to the cell according to the allocated working frequency band, regardless of the small size of the user. Whether the zone and neighboring cells support CoMP;
3 ) 通过站点或基站判断用户所在小区且其业务是否支持 CoMP, 如果不 支持 CoMP,则按照传统方式处理该用户发送的数据,采用线性或非线性检测 方法提取数据, 如果支持 CoMP, 则进入步骤 4); 3) Determine whether the user's cell is supported by the site or the base station and whether its service supports CoMP. If CoMP is not supported, the data sent by the user is processed in a conventional manner, and data is extracted by linear or non-linear detection methods. If CoMP is supported, the process proceeds to 4);
4) 如果步骤 3 ) 中的用户所在小区且其业务支持 CoMP, 则该 CoMP分 为三种情况, 即: 4) If the user in the step 3) is located in the cell and its service supports CoMP, the CoMP is divided into three cases, namely:
4.1 ) 当小区只收到边缘用户发送的数据,则判断该小区是否是边缘用户 的服务小区。 如果该小区不是该边缘用户的服务小区, 则将数据传输到该边 缘用户的服务小区; 如果该小区是边缘用户的服务小区, 则联合其他协作小 区传输来的数据进行联合检测。 4.1) When 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.
4.2) 当小区只收到中心用户发送的数据, 则按照传统的线性或非线性处 理方法检测并提取该中心用户发送的数据。 4.2) 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.
4.3 ) 当小区同时收到中心和边缘用户发送的数据, 贝 IJ : 4.3) When the cell receives data sent by the central and edge users at the same time, Bay IJ:
4.3.1 ) 提取该中心用户发送的数据, 如果该用户发送的数据正确, 则进 行干扰抵消, 并将抵消干扰后的数据发送到边缘用户的服务小区, 用于边缘 用户的联合译码; , 4.3.1) extracting data sent by the user of the center, if the data sent by the user is correct, performing interference cancellation, and transmitting the data after canceling the interference to the serving cell of the edge user for joint decoding of the edge user;
4.3.2) 如果中心用户发送的数据错误, 则不向服务小区传递数据, 该服 务小区根据自己接收的数据或其他小区的数据进行联合检测。 4.3.2) If the data sent by the central user is incorrect, no data is transmitted to the serving cell, and the serving cell performs joint detection according to the data received by itself or the data of other cells.
在本发明的整个过程中, 站点往往是多天线的, 来实现步骤 3 )和 4) 中 的干扰抵消; 用户可以单天线, 也可以多天线; 多天线时, 用户可以采用单 流和多流发送; 一个小区内同频用户数可以是单个, 也可以是多个。 In the whole process of the present invention, 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.
本发明采用一个小区边缘用户与邻小区中心用户之间共享频率资源的多 点协作。 这种多点协作方式首先避免了为多点协作用户划分专用频带的处理 过程; 其次能够利用中心用户性能来提高边缘用户性能, 即: 中心用户的性 能比边缘用户的性能好, 与边缘用户间的协作相比, 其数据正确接收的概率 更高, 于是可以在上行链路联合检测中更好地抵消中心用户对边缘用户的干 扰, 因此协作效果更好。 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.
下面我们以 3个小区的情况为例, 给出了几种可能的多点协作 /非多点协 作模式, 并给出 ICIC和 CoMP的兼容方案。
图 8 (a) - (c) 给出几种有代表性的多点协作 /非多点协作模式下的用户 数据从用户终端到各个站点间的传输, 无论是哪一种模式, 发明采用的频带 划分方式都保持不变。 In the following, we take three cases as an example, and give several possible multi-point cooperative/non-multi-point cooperation modes, and give ICIC and CoMP compatibility schemes. 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.
在各种模式下, 主要的区别在于网络侧的处理方法不同, 图 8 (a) - (c) 主要是对站点是否支持多点协作的分析, 而图 8 (d) 考虑的是边缘用户采用 多点协作、 中心小区不采用多点协作的情况- 在图 8 (a) 中, 各个站点对各个用户的数据独立解码, 不需要站点间的 数据传输; In various modes, the main difference is that the processing methods on the network side are different. 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 - In Figure 8 (a), each site independently decodes the data of each user, and does not require data transmission between sites;
在图 8 (b) 中, 小区 3不参与多点协作, 小区 1和小区 2间支持多点协 作, 此时, 小区 3中的用户和站点都可以不管小区 1和小区 2的多点协作情 况; 小区 1和小区 2间需要进行信息的交互, 交互的信息可以是采用译码前 数据和译码后的数据。 In FIG. 8(b), 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.
在图 8 (c) 中, 三个小区都参与多点协作, 站点之间要传递接收到用户 的数据 (可以是译码前或译码后的数据)。 In Figure 8(c), all three cells participate in multi-point cooperation, and the data received from the user (which may be pre-decoded or decoded) is transmitted between the stations.
图 8 (c) 所示的模式中, 如果所有用户都协作, 则站点间传递的数据量 大, 并且性能提高少, 因此更为实际的情况是图 8 (d), 其中三个小区都参与 多点协作, 但是中心用户的数据只在其服务小区处理, 不进行多点协作, 只 有边缘用户参与多点协作。 各小区提取中心用户数据, 并进行干扰抵消, 然 后才在站点之间传递多点协作用户的数据 (可以是译码前或译码后的数据)。 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.
图 9给出的是图 8 (d) 中多点协作用户的数据传输过程。 Figure 9 shows the data transfer process for multi-point collaborative users in Figure 8 (d).
根据本发明的方法, 现有方法也能够实现 CoMP, 与发明方法相比的情 况为: According to the method of the present invention, the prior art method can also implement CoMP, compared to the inventive method:
在同频网方案中, 能够通过步骤 2)— 4) 实现多点协作功能, 但是会对 不支持多点协作的情况带来很大的干扰。 In the same-frequency network solution, 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.
在划分专门频带的方案中也能实现 CoMP, 但需要在这些步骤中增加对 专用频带进行控制的信令,并且步骤 4)的处理方法会有所不同,关键是 CoMP 和 ICIC不兼容, 用户的发送不具透明性。
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.
Claims
1、 一种结合小区间干扰协调的上行多点协作实现方法, 其特征在于: 该方法包括以下步骤: 1. An uplink multi-point cooperation implementation method combining inter-cell interference coordination, wherein: the method comprises the following steps:
1 ) 站点通过测量用户的 SINR判断该用户是边缘用户还是中心用户, 并 根据 ICIC的频段划分方法分配该用户使用的工作频段; 1) 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 the frequency division method of the ICIC;
2) 用户根据分配的工作频段向小区发送数据; 2) The user sends data to the cell according to the allocated working frequency band;
3 ) 通过站点或基站判断该用户所在小区且其业务是否支持 CoMP, 如果 不支持 CoMP, 则采用线性或非线性方法提取数据, 如果支持 CoMP, 则进入 步骤 4); 3) Determine whether the cell where the user is located by the station or the base station and whether its service supports CoMP. If CoMP is not supported, the data is extracted by linear or non-linear methods. If CoMP is supported, proceed to step 4);
4) 小区收到发送的数据, 对数据进行处理。 4) The cell receives the transmitted data and processes the data.
2、 根据权利要求 1 所述的结合小区间干扰协调的上行多点协作实现方 法, 其特征在于: 所述步骤 4) 中当小区只收到边缘用户发送的数据, 则判断 该小区是否是该边缘用户的服务小区; 如果该小区不是边缘用户的服务小区, 则将数据传输到边缘用户的服务小区; 如果该小区是该边缘用户的服务小区, 则对服务小区和协作小区的数据进行联合检测。 The method for implementing the uplink multi-point cooperation in the inter-cell interference coordination according to claim 1, wherein: in the step 4), when the cell receives only the data sent by the edge user, it is determined whether the cell is the 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 of the serving cell and the coordinated cell are jointly detected. .
3、 根据权利要求 1 所述的结合小区间干扰协调的上行多点协作实现方' 法, 其特征在于: 所述步骤 4) 中当小区只收到中心用户发送的数据, 则按照 传统线性或非线性处理方法检测并提取该中心用户发送的数据。 The uplink multi-point cooperation implementation method of the inter-cell interference coordination according to claim 1, wherein: in the step 4), when the cell receives only the data sent by the central user, the traditional linear or The nonlinear processing method detects and extracts data sent by the central user.
4、 根据权利要求 1 所述的结合小区间干扰协调的上行多点协作实现方 法,其特征在于:所述步骤 4)中当小区同时收到中心和边缘用户发送的数据, 则: The uplink multi-point cooperation implementation method for inter-cell interference coordination according to claim 1, wherein in the step 4), when the cell receives the data sent by the center and the edge user at the same time, then:
4.1 ) 提取该中心用户发送的数据, 如果该用户发送的数据正确, 则进行 干扰抵消, 并将抵消干扰后的数据发送到边缘用户的服务小区进行联合检测; 4.1) extracting data sent by the center user, if the data sent by the user is correct, performing interference cancellation, and transmitting the data after canceling the interference to the serving cell of the edge user for joint detection;
4.2) 如果该中心用户发送的数据错误, 则不向服务小区传输数据, 该服 务小区根据自己接收的数据或其他小区的数据进行联合检测。 4.2) If the data sent by the central user is incorrect, no data is transmitted to the serving cell, and the serving cell performs joint detection according to the data received by itself or the data of other cells.
5、 根据权利要求 1或 2或 3或 4所述的结合小区间干扰协调的上行多 点协作实现方法, 其特征在于: 所述站点是多天线的。 The method for implementing uplink multi-point cooperation in combination with inter-cell interference coordination according to claim 1 or 2 or 3 or 4, wherein: the station is multi-antenna.
6、根据权利要求 5所述的结合小区间干扰协调的上行多点协作实现方法, 其特征在于: 所述用户是单天线或多天线; 多天线时, 用户采用单流或多流发 送。. The method for implementing uplink multi-point cooperation in combination with inter-cell interference coordination according to claim 5, wherein: the user is a single antenna or multiple antennas; when multiple antennas are used, the user uses a single stream or multiple streams. .
7、 根据权利要求 6所述的结合小区间干扰协调的上行多点协作实现方 法, 其特征在于: 所述小区内同频用户数是单用户或多用户。
The method for implementing uplink multi-point cooperation in combination with inter-cell interference coordination according to claim 6, wherein: the number of intra-frequency users in the cell is single-user or multi-user.
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CN101483873B (en) | 2010-09-08 |
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