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WO2012163151A1 - Procédé pour coordonner une configuration de sous-trame entre des cellules tdd et dispositif associé - Google Patents

Procédé pour coordonner une configuration de sous-trame entre des cellules tdd et dispositif associé Download PDF

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Publication number
WO2012163151A1
WO2012163151A1 PCT/CN2012/072948 CN2012072948W WO2012163151A1 WO 2012163151 A1 WO2012163151 A1 WO 2012163151A1 CN 2012072948 W CN2012072948 W CN 2012072948W WO 2012163151 A1 WO2012163151 A1 WO 2012163151A1
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WO
WIPO (PCT)
Prior art keywords
base station
station cell
subframe
source
cell
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PCT/CN2012/072948
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English (en)
Chinese (zh)
Inventor
潘学明
沈祖康
徐婧
Original Assignee
电信科学技术研究院
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Publication of WO2012163151A1 publication Critical patent/WO2012163151A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a TDD inter-cell subframe configuration coordination method and apparatus therefor. Background technique
  • the TDD (Time Division Duplexing) mode has received more and more attention in the context of the increasing bandwidth demand for broadband mobile communications.
  • the TDD mode means that the uplink and downlink use the same working frequency band, and the uplink and downlink signals are transmitted at different time intervals, and there is a guard interval between the uplink and the downlink (Guard Period).
  • FDD (Frequency Division Duplexing) mode refers to the use of different working frequency bands on the uplink and downlink. It can transmit uplink and downlink signals on different frequency carriers at the same time, and there is protection between uplink and downlink. Guard Band.
  • Common TDD systems include 3G TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) systems and 4G TD-LTE (Long Term Evolution TD-SCDMA) systems.
  • a radio frame has a length of 10 ms, and includes 10 subframes of a special subframe and a regular subframe, and each subframe is 1 ms.
  • the special subframe is divided into three slots: DwPTS, GP, and UpPTS, where DwPTS is used to transmit PSS/PDCCH/PHICH/PCFICH/PDSCH, etc., and GP is used between downlink and uplink.
  • the guard interval, UpPTS is used to transmit SRS/PRACH.
  • the regular subframe includes an uplink subframe and a downlink subframe, and is used for transmitting uplink/downlink control signaling, service data, and the like.
  • two special subframes located in subframes #1 and #6 or a special subframe (located in subframe #1) may be configured.
  • Subframe #0 and subframe #5 and DwPTS slots in special subframes are always used for downlink transmission, and subframes #2 and UpPTS slots in special subframes are always used for uplink transmission, and other subframes can be used as needed. Configured to be used for upstream or downstream transmission.
  • the sum of the three time slots of the DwPTS/GP/UpPTS in the special subframe is lms, and the three slot length divisions support different configurations.
  • the uplink and downlink subframe allocation in TD-LTE supports 7 different modes.
  • the specific configuration parameters are as shown in Table 2 below. D indicates that it is used for downlink transmission, U indicates that it is used for uplink transmission, and S indicates that the subframe is a special subframe, including DwPTS, GP and UpPTS three parts.
  • the division of the uplink and downlink time slots is static or semi-static. Generally, in the network planning process, the uplink and downlink time slot ratios are determined and remain unchanged according to the cell type and the approximate service ratio.
  • the special subframe configuration and the above-mentioned special subframe configuration The line subframe allocation mode is broadcast to all users in the cell through System Information (SI). This is a relatively simple approach in the context of large coverage of macro cells, and is also more effective. With the development of technology, more and more low-power base stations such as Pico cells and Home NodeBs are deployed to provide local small coverage. In such cells, the number of users is small, and The user service requirements vary greatly. Therefore, there is a dynamic change in the proportion of uplink and downlink services in the cell.
  • SI System Information
  • the TD-LTE standard supports online change of the uplink and downlink time slot ratio of a cell, such as changing the above two frame configuration parameters by means of System Information Change.
  • this change requires a process of paging and re-reading system information, and there are some ambiguities before and after the change. For example, if the frame configuration changes frequently, the system performance is seriously degraded, and HARQ (Hybrid Automatic Repeat Request, hybrid) Automatic retransmission requests) operations and scheduling, etc., adversely affect.
  • the minimum frame configuration change period supported by the TD-LTE standard is 640 ms, which is not flexible enough to fully adapt to the dynamic change of the service. Summary of the invention
  • Embodiments of the present invention provide a TDD inter-cell subframe configuration coordination method and apparatus thereof for improving subframe configuration flexibility.
  • the TDD inter-cell subframe configuration coordination method includes: the source TDD base station cell performs a subframe configuration change decision on the base station cell, and when it is determined that the subframe configuration change needs to be performed on the base station cell, the adjacent The target TDD base station cell sends a subframe configuration change request;
  • the source TDD base station cell receives the feedback information of the target TDD base station cell to receive the subframe configuration change request, and performs corresponding setting of the subframe configuration on the base station cell according to the feedback information.
  • the base station provided by the embodiment of the present invention is applied to a TDD system, and includes:
  • a first decision module configured to perform a subframe configuration change decision on the base station cell when the base station is the source base station, and send the subframe to the adjacent target base station when the subframe configuration change is required to be performed on the base station cell Frame configuration change request;
  • a second determining module configured to determine, according to the base station as the target base station, whether to accept a subframe configuration change request of the source base station
  • a feedback module configured to: when the base station is the target base station, return, to the source base station, whether to accept the feedback information of the subframe configuration change request;
  • the configuration module is configured to perform, according to whether the base station returns the feedback information of the subframe configuration change request, according to the feedback information of the subframe configuration change request returned by the target base station, and perform corresponding setting of the subframe configuration on the base station cell.
  • the source TDD base station cell sends a subframe change configuration request to the adjacent target TDD base station cell when the subframe configuration change is required, so that the target TDD base station cell accepts the subframe change configuration request.
  • the decision is made and the feedback information of the request is accepted.
  • the source TDD base station cell sets the subframe configuration of the base station cell according to the feedback information, thereby improving the subframe configuration flexibility.
  • DRAWINGS 1 is a schematic diagram of a frame structure of a TD-LTE system in the prior art
  • FIG. 2 is a schematic diagram of a dynamic uplink-downlink subframe allocation scheme according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of TDD cross-slot interference
  • FIG. 4 is a schematic diagram of a TDD inter-cell subframe configuration coordination process according to an embodiment of the present invention.
  • FIG. 5A and FIG. 5B are respectively schematic diagrams of a TDD inter-cell subframe configuration coordination signaling process according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a base station device according to an embodiment of the present invention. detailed description
  • the following scheme may be adopted: In a certain period of time, four seed frame types are set, including a subframe fixed for downlink transmission, a subframe fixed for uplink transmission, and flexible allocation.
  • the time period is a radio frame (only one example, and may be other time periods), where subframes #0, #5 are fixed downlink subframes, subframe #2, # 7 is a fixed uplink subframe, subframes #1, #6 are special subframes (which can also be classified as fixed downlink subframes), and other subframes (#3, #4, #8, #9) are flexibly allocated as Subframe transmitted in the uplink or downlink.
  • the base station can be dynamically configured according to real-time service requirements and channel conditions to adapt to dynamic changes in service requirements.
  • the cross-slot interference of the neighboring cells may be caused, as shown in FIG. Show.
  • the neighboring cell here may be a geographically adjacent cell using the same TDD carrier (as shown in FIG. 3), a cell deployed in the same layer (for example, a macro cell), or may be layered.
  • a deployed cell eg, including a macro cell, a micro cell, a home base station, etc.
  • the impact of such cross-slots 4 on system performance is closely related to the deployment scenario and the wireless environment.
  • the cross-slot interference will be seriously reduced.
  • Cell performance in the receiving state if the distance between neighboring cells is far, or there is a valid letter No. occlusion, etc., the cross-slot interference level has little effect on the performance of the cell in the receiving state.
  • the embodiment of the present invention provides a coordination mechanism for inter-cell subframe configuration in a TDD, so that a neighboring TDD cell can select an appropriate TDD subframe allocation manner by negotiation, thereby avoiding cross-slot interference to the system.
  • the adverse effects of performance are not limited to, but not limited
  • the neighboring TDD cells in the same network are time-synchronized cells, and the neighboring cells mentioned herein may be adjacent cells of the same frequency or adjacent cells of adjacent frequencies.
  • the source TDD base station cell when the TDD base station cell determines that the subframe configuration change needs to be performed on the base station cell, the source TDD base station cell sends a subframe configuration change request to the adjacent target TDD base station cell, and receives the target TDD base station cell reply feedback.
  • the information determines whether the subframe configuration change is performed on the base station cell according to the received feedback information, and if the determination is yes, performs corresponding setting of the subframe configuration on the base station cell.
  • the TDD base station cell receives the subframe configuration change request message sent by the source TDD base station cell as the target TDD base station cell, according to the subframe configuration expected by the source TDD base station cell and the current subframe configuration of the local base station cell Whether there is a subframe configuration change request of the source TDD base station cell at the time of intersection, and returning feedback information for accepting or rejecting the subframe configuration change request to the source TDD base station cell.
  • FIG. 4 it is a schematic diagram of a TDD inter-cell subframe configuration coordination process according to an embodiment of the present invention. As shown in the figure, the process may include the following steps:
  • Step 401 The source TDD base station cell determines whether a TDD subframe configuration change is required.
  • the source TDD base station cell can determine whether a TDD subframe configuration change needs to be performed according to its own needs and the wireless environment condition.
  • the source TDD base station The factors considered when the cell performs the TDD subframe configuration change determination include, but are not limited to, one or any of the following:
  • Source TDD base station cell uplink interference level For example, if the interference level of the uplink subframe is high, the transmission direction of the uplink subframe corresponding to the downlink signal with the higher interference level and the interference from the neighboring base station is determined to be the downlink subframe. Specifically, if the uplink subframe of the source TDD base station cell is caused by interference from the downlink signal of the neighboring TDD base station, and the interference level is higher than the set threshold, the uplink subframe whose interference level is higher than the set threshold is changed to Downstream subframe.
  • Source TDD base station cell downlink interference level. For example, if the interference level of the downlink subframe is high, the transmission direction of the downlink subframe corresponding to the uplink signal transmission of the user equipment (UE) can be changed. Configured as an uplink subframe. Specifically, if the downlink subframe of the source TDD base station cell is caused by the interference of the uplink signal from the neighboring TDD base station cell UE, and the interference level is higher than the set threshold, the downlink subframe whose interference level is higher than the set threshold is performed. Change to an uplink subframe.
  • the interference indication information of the neighboring base station cell received by the source TDD base station cell indicates that an uplink subframe is subjected to strong interference if the source
  • the TDD base station cell configures the downlink transmission on the corresponding subframe, and then adapts it to the uplink subframe. Specifically, the source TDD base station cell determines, according to the received interference indication information of the neighboring base station cell, that the interference that the neighboring base station cell has in the uplink subframe exceeds a set threshold, and the subframe is configured in the source TDD base station cell. For the downlink subframe, the source TDD base station cell changes the downlink subframe to an uplink subframe.
  • the transmit power indication information of the neighboring base station cells received by the source TDD base station cell For example, the neighboring base station cell indicates that the downlink transmission power is increased. If the source TDD base station cell configures the uplink transmission in the corresponding subframe, it is configured as a downlink subframe.
  • Step 402 If the source TDD base station cell determines that the TDD subframe configuration needs to be changed Further, the TDD subframe configuration change request message is transmitted to the adjacent target TDD base station cell.
  • the request message may include but is not limited to one or any of the following information:
  • the reason why the source TDD base station cell desires to change the configuration of the TDD subframe for example, the reason may be a service demand trigger or an interference trigger or the like.
  • Step 403 After receiving the TDD subframe configuration change request message sent by the source TDD base station cell, the target TDD base station cell checks, according to the target TDD subframe configuration desired by the source TDD base station cell, the current (in the target TDD base station cell) In the case where there is no need to perform subframe configuration change at this time) or desired (when the target TDD base station cell has a need to perform subframe configuration change at this time), the TDD subframe configures the base station cell to determine whether to accept the source TDD base station cell. TDD subframe configuration change request.
  • the target TDD base station cell receives the TDD subframe configuration change request message of the plurality of source TDD base station cells, the judgment is performed one by one for each source TDD base station cell.
  • the target TDD base station cell may consider one or any of the following factors in the judgment process:
  • the subframe in which the cross slot is present is a subframe in which the target TDD base station cell transmits key information.
  • the target TDD base station cell is configured with a random access channel or other key uplink control signal transmission in a certain uplink subframe, and the source TDD base station cell desires to adapt the position corresponding to the subframe to the downlink transmission, which may be The target TDD base station cell causes a large performance degradation. In this case, the target TDD base station cell can be rejected.
  • the TDD subframe configuration change request of the source TDD base station cell is configured with a random access channel or other key uplink control signal transmission in a certain uplink subframe.
  • the path loss between the source TDD base station cell and the target TDD base station cell For example, if the path loss is less than the preset threshold, a large cross-slot interference may be caused. In this case, the target TDD base station cell may reject the TDD subframe configuration change request of the source TDD base station cell.
  • the path loss can be obtained in one of several ways:
  • Mode 1 The source TDD base station cell measures the path loss, and sends the measured path loss value to the target TDD base station cell;
  • Mode 2 Target The TDD base station cell measures and calculates the path loss by itself. For example, the learned TDD base station cell downlink signal transmission power is subtracted from the source TDD base station cell downlink signal transmission power received by the target TDD base station cell;
  • the source TDD base station cell measures the downlink signal power (set to P_r) of the target TDD base station received, and the target TDD base station calculates the path loss (PL) indirectly.
  • the source TDD base station cell downlink signal power received by the target TDD base station cell. For example, if the power received by the target TDD base station cell is greater than the preset threshold, a large cross-slot interference may be caused. In this case, the target TDD base station cell may reject the TDD subframe configuration change request of the source TDD base station cell. .
  • the received power level can be obtained by using one of the following methods: Mode 1: Target The TDD base station cell directly measures the downlink signal power of the received source TDD base station cell;
  • the target TDD base station cell obtains the received power by learning the source TDD base station cell transmit power and the path loss between the two.
  • Source TDD base station cell changes the reason for TDD subframe configuration. For example, if the calculated or measured cross-slot interference level is similar, if the TDD subframe configuration change triggered by the source cell service requirement, the priority may be appropriately lower than the TDD subframe configuration triggered by the interference avoidance. The priority of the change.
  • Step 404 The target TDD base station cell according to whether to accept the source TDD base station cell
  • the TDD subframe configuration change request sends a feedback message to the source TDD base station cell.
  • the feedback message may include but is not limited to one or any of the following information:
  • (b) Reason for rejecting the source TDD base station cell subframe configuration change request For example, it indicates that the base station cell (ie, the target TDD base station cell) cannot accept cross-slot interference, or indicates that the source TDD base station cell transmission power is too high;
  • Step 405 After receiving the feedback message returned by the target TDD base station cell, the source TDD base station cell performs corresponding processing according to the feedback message. For example, if the target TDD base station cell rejects the subframe configuration change request of the source TDD base station cell, the source TDD base station cell keeps the current subframe configuration unchanged; if the target TDD base station cell accepts the subframe configuration change request of the source TDD base station cell, then The source TDD base station cell changes the current subframe configuration.
  • the TDD subframe configuration may be integrated, for example, if at least one target TDD base station cell replies with the reject message, the source TDD base station cell maintains the current The subframe configuration is unchanged.
  • the subframe configuration coordination process between the above TDD cells can be performed under different conditions. For example, it can be triggered in at least two cases:
  • the TDD subframe configuration is set for the first time
  • the signaling interaction process of the subframe configuration coordination process between the foregoing TDD cells may be as shown in FIG. 5A. Or as shown in Figure 5B.
  • 5A shows a signaling flow of a subframe configuration change request of a target TDD base station cell accepting a source TDD base station cell
  • FIG. 5B shows a signaling of a subframe configuration change request of a target TDD base station cell reject source TDD base station cell.
  • interaction may be performed through a wired interface between adjacent cells, such as an X2 interface or/and an S1 interface, or may be directly performed and transmitted through an air interface between adjacent cells.
  • the TDD inter-cell subframe configuration coordination scheme provided by the embodiment of the present invention enables a neighboring cell to select an appropriate TDD subframe allocation manner by negotiation, thereby avoiding cross-slot interference to system performance.
  • the adverse effects make the flexible TDD subframe allocation mechanism work better, that is, while ensuring the flexibility of TDD subframe configuration, the impact of cross-slot interference on system performance is also avoided to some extent, and the technical solution is improved. Availability.
  • an embodiment of the present invention further provides a base station, which can be applied to the foregoing processing flow.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in the figure, the base station may include:
  • the first determining module 601 is configured to perform a subframe configuration change decision on the base station cell when the base station is the source base station, and send the subframe configuration change to the neighboring target base station when the base station cell needs to be changed. Subframe configuration change request;
  • the second determining module 602 is configured to determine, if the base station is the target base station, whether to accept the subframe configuration change request of the source base station;
  • the feedback module 603 is configured to: when the base station is the target base station, return, to the source base station, whether to accept the feedback information of the subframe configuration change request;
  • the configuration module 604 is configured to: if the base station is the source base station, perform corresponding setting of the subframe configuration on the cell of the base station according to whether the target base station returns the feedback information of the subframe configuration change request.
  • the first determining module 601 may carry the subframe configuration expected by the base station cell in the subframe configuration change request; the second determining module 602 may be configured according to the source base station. Whether there is an inter-slot and an inter-slot interference level between the subframe configuration and the current or desired subframe configuration of the base station cell, and determining to accept or reject the subframe configuration change request of the source base station.
  • the first determining module 601 may perform a subframe configuration change decision on the base station cell according to one or any combination of the following:
  • the uplink interference level of the cell of the base station specifically; if the uplink subframe signal received by the base station cell is interfered by the downlink signal from the neighboring base station cell, and the interference level is higher than a set threshold, the interference level is high.
  • the uplink subframe that sets the threshold is changed to the downlink subframe.
  • the interference indication information of the neighboring base station cell received by the cell in the centralized group specifically, if the base station cell determines, according to the received interference indication information of the neighboring base station cell, the neighboring base station cell has an uplink subframe received If the interference exceeds the set threshold, and the subframe is configured as a downlink subframe in the base station cell, the downlink subframe is changed to an uplink subframe.
  • the transmit power indication information of the neighboring base station cell received by the base station d and the area specifically, if the base station cell determines the downlink transmit power of the neighboring base station according to the received transmit power indication information of the neighboring base station cell If the corresponding subframe of the cell of the base station is an uplink subframe, the uplink subframe is changed to a downlink subframe.
  • the first determining module 601 may carry one or any combination of the following information in the subframe configuration change request message:
  • the path loss measured by the base station cell and the target base station cell The path loss measured by the base station cell and the target base station cell; the downlink signal power of the target base station cell received by the base station cell; Downlink signal transmission power of the base station cell.
  • the second determining module 602 may determine to accept or reject the subframe configuration change request of the source base station according to one or any combination of the following:
  • the subframe in which the cross-slot is present is a subframe in which the base station cell transmits the key information; specifically, if the base station cell is configured with the uplink uplink control signal transmission in the uplink subframe in which the cross-slot is present, the source base station cell If it is desired to change the position corresponding to the subframe to the downlink transmission, the subframe configuration change request of the source base station cell is rejected.
  • the feedback module 603 may carry one or any combination of the following information to the feedback message and return it to the source base station:
  • the transmit power of the source base station cell that the base station cell can accept is the transmit power of the source base station cell that the base station cell can accept.
  • the configuration module 604 is specifically configured to: if the base station receives the feedback message of the multiple target base station cells, synthesize the feedback information of the multiple target base station cells, and perform the setting of the base station cell subframe configuration.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the form of the software product is embodied, the computer software product is stored in a storage medium
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour coordonner une configuration de sous-trames entre des cellules de duplexage par répartition dans le temps (TDD) et un dispositif associé. Le procédé comprend les étapes suivantes : une cellule d'une station de base TDD source réalise une détermination de modification de la configuration de sous-trames pour une cellule d'une station de base actuelle, et lorsque la détermination est que la configuration de sous-trames de la cellule de la station de base actuelle a besoin d'être modifiée, envoie une demande de modification de configuration de sous-trames à une cellule d'une station de base TDD cible adjacente ; et la cellule de la station de base TDD source reçoit des informations de retour, renvoyées par la cellule de la station de base TDD cible, indique s'il faut accepter la demande de modification de configuration de sous-trames, et paramètre la configuration de sous-trames de la cellule de la station de base actuelle en conséquence selon les informations de retour. L'invention peut améliorer la flexibilité de la configuration de sous-trames.
PCT/CN2012/072948 2011-05-31 2012-03-23 Procédé pour coordonner une configuration de sous-trame entre des cellules tdd et dispositif associé WO2012163151A1 (fr)

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CN201110144583.1A CN102215534B (zh) 2011-05-31 2011-05-31 一种tdd小区间子帧配置协调方法及其装置
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