WO2012152148A1 - Procédé et système de coopération de station de base - Google Patents

Procédé et système de coopération de station de base Download PDF

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Publication number
WO2012152148A1
WO2012152148A1 PCT/CN2012/073187 CN2012073187W WO2012152148A1 WO 2012152148 A1 WO2012152148 A1 WO 2012152148A1 CN 2012073187 W CN2012073187 W CN 2012073187W WO 2012152148 A1 WO2012152148 A1 WO 2012152148A1
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WIPO (PCT)
Prior art keywords
base station
cooperation
resource
priority
ues
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PCT/CN2012/073187
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English (en)
Chinese (zh)
Inventor
陈诗军
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems

Definitions

  • the present invention relates to the field of communications, and in particular to a base station cooperation method and system.
  • Background Art As a standard for the fourth generation communication system (4G), IMT-Advanced (Intelligent Multimode)
  • Terminal-Advanced an improved intelligent multi-mode terminal puts higher demands on the performance of the system, especially the frequency efficiency of the uplink and downlink.
  • Coordinated multi-point transmission/reception is a technology that can expand the coverage of rate transmission, improve the quality and throughput of cell edge services, and system throughput. It is an important technology to improve the spectrum utilization of the system. , got a lot of attention.
  • the so-called coordinated multi-point transmission that is, multiple base stations cooperatively transmit and serve one or more UEs (User Equipment).
  • the 3MP defined by the 3GPP includes two scenarios, one is multi-point cooperative scheduling, that is, through the interaction scheduling information between adjacent nodes, the interference coordination between the transmission signals of each cell is achieved; the other is multi-point joint processing, that is, A plurality of cooperative nodes jointly provide services to target users by sharing data, CSI (Channel Situation Information), scheduling information, and the like.
  • CSI Channel Situation Information
  • the current coordinated multi-point transmission architecture diagram is shown in Figure 1.
  • the serving base station (Serving eNode-B) and the cooperative base station (Collaborative eNode-B) are connected through an optical interface (X2 Interface), and the two base stations are simultaneously UE0 and UE1. Provide resources, the current X2 interface is not defined.
  • the distance between the user at the edge of the cell and the neighboring cell is comparable to the distance of the serving cell, and is subject to the characteristics of Network MIMO (Multi-Input Multi-Output).
  • the edge user is the main interference object (the downlink is interfered by the neighboring cell, and the uplink interferes with the neighboring cell).
  • FFR Fractional Frequency Reuse
  • power control are mainly used.
  • FFR is mainly a strategy for interference avoidance. In this way, if it cooperates, it will bring greater performance to edge users. Improve, while improving the overall performance of the system.
  • JP Joint Processing
  • JT Joint transmission
  • DCS Dynamic Channel Selection
  • COMP Coordinated Scheduling/Beamforming
  • DL COMP downlink COMP
  • the method of setting the cell priority is basically adopted, and the cell is divided by the priority.
  • the cell with the highest priority is selected first.
  • the defect of this method is that the COMP cooperation is reduced. opportunity.
  • the interference received by UEs in different base stations is not necessarily equal.
  • cooperation needs to be eliminated to eliminate the interference received by the UE.
  • the priority processing method used in the related technologies reduces the chance of COMP cooperation, which may be needed. This can not be achieved in the case of collaboration to eliminate interference. For example, referring to FIG.
  • UE a can receive the wireless signal b sent by B2 in addition to the signal a of the base station B1, and the wireless signal b can interfere with the signal a sent by B1.
  • UE b does not necessarily receive the interference signal a of NB1. Therefore, the UEs under the two base stations receive different interference conditions, and the requirements for whether or not cooperation is required to eliminate interference are also different.
  • FIG. 2 it is only necessary to eliminate the interference received by the UE a. In actual operation, the interference cancellation operation must be performed on both UEs, which causes waste of resources. In view of the problem of reducing the opportunities for COMP collaboration and the waste of resources in related technologies, no effective solution has been proposed yet.
  • a main object of the embodiments of the present invention is to provide a base station cooperation method and system, so as to at least solve the problem of reducing the opportunity of COMP cooperation and causing waste of resources in the related art.
  • a base station cooperation method including: a base station initiating cooperation determines a resource to be allocated to a user equipment (UE); and a coordinated multipoint transmission (COMP) set in addition to the initiated collaboration
  • the other base stations outside the base station cooperate to select UEs applicable to the resources in the respective managed UEs, wherein the COMP set includes all base stations capable of performing allocation processing on the resources.
  • the method further includes: each UE determining its own measurement COMP set, where the measurement COMP set includes at least one sector, and the UE can A downlink common pilot signal of the at least one sector is detected, and a downlink common pilot signal strength of the at least one sector exceeds a preset threshold.
  • other base stations other than the base station that initiates cooperation in the COMP set cooperatively select UEs suitable for the resource in the respective managed UEs, including: the other base stations determining whether the resources have been pre-allocated to One or more specified UEs; the other base station selects a UE applicable to the resource according to the judgment result.
  • the selecting, by the other base station, the UE that is applicable to the resource according to the determination result includes: if the resource is not pre-assigned to the designated UE, the other base station selects the UE from the UE that does not participate in the pre-allocation The other base stations are paired and the resources are allocated to the successfully paired UE.
  • the selecting, by the other base station, the UE that is applicable to the resource according to the determination result includes: if the resource has been pre-allocated to the designated UE, the other base station is paired with the designated UE.
  • the other base station is paired with the designated UE, including: if the pairing is successful, the other base station directly calculates a precoding matrix of the resource according to the channel information fed back by the successfully paired UE; if the pairing is unsuccessful, The other base station calculates the precoding matrix according to the channel information fed back by the unsuccessful UE and the priority of the base station that initiates the cooperation.
  • the calculating, by the other base station, the precoding matrix of the resource according to the priority of the base station that initiates the cooperation includes: when the priority of the base station that initiates cooperation is higher than the priority of the other base station, The other base station calculates the precoding matrix by using channel information that does not include the feedback of the specified UE.
  • a base station cooperation system including: a base station that initiates cooperation and another base station in a coordinated multipoint transmission (COMP) set other than the base station that initiates cooperation: the base station that initiates cooperation And being configured to determine a resource to be allocated to the user equipment (UE); the other base station is configured to cooperatively select, in the respective managed UE, a UE that is set to be the resource, where the COMP set includes all capable of The base station on which the resource performs allocation processing.
  • COMP coordinated multipoint transmission
  • the base station that initiates the cooperation and the other base station are further configured to set a measurement COMP of the UE that is managed by itself, where the measurement COMP set includes at least one sector, and the UE can detect the at least one fan. a downlink common pilot signal of the area, and the downlink common pilot signal strength of the at least one sector exceeds a preset threshold.
  • the other base station is further configured to determine whether the resource has been pre-allocated to the designated one or more UEs; and select, according to the determination result, a UE that is suitable to be the resource.
  • the other base station is further configured to: if the resource is not pre-assigned to the designated UE, select a UE to be paired with the other base station from the UE that does not participate in the pre-allocation, and allocate the resource to the successfully paired UE. .
  • the other base station is further configured to pair with the designated UE if the resource has been pre-allocated to the designated UE.
  • the other base station is further configured to: if the pairing is successful, directly calculate the precoding matrix of the resource according to the channel information fed back by the successfully paired UE; if the pairing is unsuccessful, according to the channel information and the feedback of the unsuccessful UE.
  • the precoding matrix is calculated by the priority of the base station initiating the cooperation.
  • the other base station is further configured to: when the priority of the base station that initiates cooperation is higher than the priority of the other base station, calculate the precoding matrix by using channel information that does not include the feedback of the specified UE; When the priority of the base station that initiates the cooperation is lower than the priority of the other base station, the designated UE is forcibly paired, and the precoding matrix is calculated by using the channel information fed back by the specified UE.
  • the base station that initiates the cooperation determines the resources to be allocated to the UE, and the other base stations other than the base station that initiates the cooperation in the COMP set cooperatively select the UE applicable to the resource, ie, the local
  • there is no priority constraint in the condition of collaborative initiation which can effectively increase the cooperation opportunity.
  • FIG. 1 is a coordinated multi-point transmission architecture diagram according to the related art
  • FIG. 2 is an asymmetric cooperation scenario diagram according to the related art
  • FIG. 3 is a processing flowchart of a base station cooperation method according to an embodiment of the present invention
  • 4 is a schematic structural view of a first embodiment of the present invention
  • FIG. 5 is a flowchart of an embodiment of a second embodiment of the present invention
  • FIG. FIG. 1 is a coordinated multi-point transmission architecture diagram according to the related art
  • FIG. 2 is an asymmetric cooperation scenario diagram according to the related art
  • FIG. 3 is a processing flowchart of a base station cooperation method according to an embodiment of the present invention
  • 4 is a schematic structural view of a first embodiment of the present invention
  • FIG. 5 is a flowchart of an embodiment of a second embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a base station cooperation system according to an embodiment of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • the method of setting the cell priority is generally preferred, and the cell is divided by the priority. When the resource is scheduled for the UE, the cell with the highest priority is selected first. It is an opportunity to reduce COMP collaboration. In fact, the interference received by the UEs in different base stations is not necessarily equal.
  • the embodiment of the present invention provides a base station cooperation method, where the processing flow is as shown in FIG. 3, and includes steps S302 to S304: Step S302: The base station that initiates cooperation determines resources to be allocated to the UE; S304. The other base stations other than the base station that initiates cooperation in the COMP set cooperatively select UEs applicable to the foregoing resources in the UEs that are managed by the UEs.
  • the COMP set includes all base stations that can perform allocation processing on the foregoing resources.
  • the base station that initiates the cooperation determines the resources to be allocated to the UE, and the other base stations other than the base station that initiates the cooperation in the COMP set cooperatively select the UE applicable to the resource, ie, the local
  • there is no priority constraint in the condition of collaborative initiation which can effectively increase the cooperation opportunity.
  • each UE determines its own measurement COMP set, wherein the measurement COMP set includes at least one sector, and the UE can detect at least one The downlink common pilot signal of the sector, and the downlink common pilot signal strength of at least one sector exceeds a preset threshold.
  • measuring COMP sets through relative intensity threshold control can reduce the cost of collaboration and increase revenue.
  • step S304 other base stations other than the base station that initiates cooperation in the COMP set cooperatively select UEs suitable for the foregoing resources in the respective managed UEs, and the processing flow is as follows: Other base stations determine the foregoing resources. Whether it has been pre-allocated to the specified one or more UEs, and selects a UE applicable to the above resources according to the judgment result. In a preferred embodiment, the other base station selects the UE that is applicable to the resource according to the judgment result.
  • the other base station selects the UE and the UE from the UE that does not participate in the pre-allocation.
  • the other base stations are paired, and the above resources are allocated to the successfully paired UE.
  • the channel information corresponding to different resources is different. Therefore, channel information can be used for pairing in the process of pairing. If the channel information can be paired successfully, the resources can be paired successfully, and then the resources may be allocated to the pairing. Successful UE.
  • the pairing result may be successful pairing, or the pairing may be unsuccessful.
  • the preferred processing manner includes If the pairing is successful, the other base station directly calculates the precoding matrix of the foregoing resource according to the channel information fed back by the successfully paired UE. If the configuration is unsuccessful, the preferred processing manner includes: the other base station calculates a precoding matrix of the foregoing resource according to the channel information fed back by the unsuccessful UE and the priority of the base station that initiates the cooperation.
  • the other base station combines the precoding matrix of the priority calculation resource of the base station that initiates the cooperation, and the preferred processing manner includes: when the priority of the base station that initiates cooperation is higher than the priority of other base stations, the other base station uses the feedback that does not include the specified UE.
  • the channel information is used to calculate a precoding matrix of the foregoing resources; when the priority of the base station initiating cooperation is lower than the priority of other base stations, the other base stations perform forced pairing on the designated UE, and calculate the precoding of the foregoing resources by using channel information fed back by the specified UE. matrix.
  • Embodiment 1 the structure shown in FIG. 4 is set, specifically including the following modules, and the functions of each module are listed: Pre-scheduling module: The original system needs to be modified to increase the pre-allocation function of the air interface resource; Module: Responsible for receiving channel measurement data transmitted by the UE through the air interface; Downstream precoding module: Modification in the original system, adding dynamic precoding function;
  • the base station cooperation method provided by the embodiment of the present invention includes steps 1 to 7: First, the UE detects all downlink common pilot signal strengths; and second step, if a downlink signal is relative to the signal strength of the service station If the threshold value is exceeded, the downlink signal is subjected to full bandwidth channel measurement, and all base stations exceeding the threshold constitute a measurement COMP set of the UE.
  • the uplink channel feedback module performs channel data according to the allocated resource information and channel data amount. Automatic particle size matching, sending channel data to the base station; fourth step, the uplink channel data receiving module detects the channel data and sends it to the COMP module; in the fifth step, the COMP module maintains the resource cooperation set, notifies the scheduling module to perform pre-scheduling, and The pre-scheduled resource information, channel information, and time information are sent to the corresponding base station according to the COMP set of the UE. Step 6: After receiving the sent information, the COMP module performs the following three pairing algorithms according to the COMP set:
  • the user is selected from the user who has not participated in the pre-allocation to be paired with the COMP set;
  • the user who uses the resource is paired with the COMP set. If the pairing is successful, the w is calculated, and the UE is resource-scheduled by using the successfully paired sector; 3. If the pairing is unsuccessful and the priority of the station (ie, the sector) is high, the channel information fed back by the station is not considered when calculating W, and the resource scheduling of the UE is not used by the station; if the pairing is unsuccessful, And the station has low priority, forced pairing, calculation W, and use the local station to perform resource scheduling for the UE. After determining whether the pairing is successful or unsuccessful, the downlink precoding matrix of the resources that can be scheduled is calculated according to the channel information of the service station and other stations in the COMP set. In the seventh step, the COMP module sends the precoding information to the downlink precoding module during resource scheduling.
  • the base station cooperation method and apparatus provided by the implementation of the present invention have the following advantages compared with the related technologies:
  • the interference elimination is highly targeted, and the interference is eliminated. If there is no interference, it is carried out according to the original process, with strong independence and quick response;
  • the asymmetric cooperation first adopts a cell based on the relative strength of the common pilot signal exceeding the threshold as the initial cooperation set of the UE, and the base station determines the resource cooperation set by the resource allocation to perform the second coordinated set control, and the two cooperative sets are more flexible.
  • the UE can be made smoother in cooperative mode and non-cooperative mode control;
  • Controlling the UE collaboration set through the relative strength threshold can make the collaboration cost small and the benefit is large.
  • FIG. 5 is a schematic diagram of an implementation scenario of the embodiment.
  • the architecture and specific network environment of each user, device, or entity in FIG. 5 are as follows: B2 has two sectors: CELLB and CELLc; B1 has CELLa below.
  • Sector has two sectors: CELLB and CELLc; B1 has CELLa below.
  • the current serving cell of UEa is CELLa, which is at the boundary of CELLa and P CELLb, so it can receive the interference signal of CELLb;
  • the current serving cell of UEb is CELLb; it is at the boundary of CELLb and CELLc, so it can receive the interference signal of CELLc;
  • the current serving cell of UEc is CELLc, which is at the boundary of three cells of CELLa and CELLB CELLc, so it can receive interference signals of CELLb and CELLa. It is assumed that the resources allocated by all three UEs overlap, and if they do not overlap, the precoding matrix does not need to be changed, and is still processed in the manner mentioned in the related art.
  • the processing flow of the specific cooperation method in this embodiment is as shown in FIG. 6, and includes steps S602 to S622.
  • RSRPs Receiveived Signal Code Power
  • Step S604 The UEb reports all the observed downlink RSRPs to the NB2, and reports the channel information if the threshold is exceeded. In this example, the channel information of the local station and the CELLc station is reported at the same time.
  • Steps S606 and B1 since only including CELLa, also called Ba), after receiving the report of the UEa, send the channel information of the CELLb measured by the UEa and the resource allocation information of the UEa to the B2-CELLb (abbreviated as Bb).
  • Step S608 After receiving the report of the UEb, the B2-CELLb sends the channel information of the CELLc measured by the UEb to the B2-CELLc b (abbreviated as Bc).
  • Steps S610 and B1 are precoding matrices generated by the UEA still using the related art.
  • Steps S612 and B1 send the resource allocation information of the UEa to the B2-CELLb.
  • Step S616 After receiving the report of the UEc, the B2-CELLc sends the channel information of the CELLb measured by the UEc and the resource allocation information of the UEc to the B2-CELLb, and sends the channel information of the CELLa measured by the UEc and the resource allocation information of the UEc to the Bl-CELLa.
  • Step S618 The B2-CELLB allocates to the UEb, and the same resource as the UEa or the UEc, calculates the UEb downlink precoding according to the maximum leakage ratio principle according to the CELLb channel measured by the UEa, the CELLb channel measured by the UEc, and the CELLb channel measured by the UEb. matrix.
  • Step S620 B2-CELLc calculates the precoding matrix of the UEc downlink according to the maximum leakage ratio principle according to the CELLc measured by the UEb and the CELLc channel measured by the UEc for the same resource allocated to the UEc and the UEc.
  • Step S622 The Bl-CELLa allocates the UEA, and the UEc is the same resource, and calculates the UEa downlink precoding matrix according to the maximum leakage ratio principle according to the CELLa channel measured by the UEc and the UEa measured by the UEa.
  • an embodiment of the present invention further provides a base station cooperation system, and a schematic structural diagram thereof is shown in FIG. 7.
  • the base station 701 that initiates cooperation and other base stations 702 other than the base station that initiates cooperation in the set of COMPs are initiated:
  • the base station 701 is configured to determine resources to be allocated to the UE;
  • the other base station 702 is connected to the base station 701 that initiates cooperation, and is configured to cooperatively select UEs suitable for resources in the respective managed UEs, where the COMP set includes all capable A base station that allocates resources for processing.
  • the base station 701 and other base stations 702 that initiate cooperation may also be configured to determine the UE's own measurement COMP set, wherein the measurement COMP set includes at least one sector, and the UE can detect a downlink common pilot signal of at least one sector, and a downlink common pilot signal strength of at least one sector exceeds a preset threshold.
  • the other base station 702 may further be configured to determine whether the resource has been pre-allocated to the designated one or more UEs; and select a UE applicable to the resource according to the determination result.
  • the other base stations 702 may also select the UE to be paired with other base stations from the UEs that do not participate in the pre-allocation, and allocate the foregoing resources to the successfully paired UEs. .
  • the other base station 702 may also pair with the designated UE if the foregoing resource has been pre-assigned to the designated UE.
  • the other base station 702 may be further configured to: if the pairing is successful, calculate the precoding matrix of the resource directly according to the channel information fed back by the successfully paired UE; if the pairing is unsuccessful, according to the unsuccessful UE feedback The channel information and the priority of the base station initiating the cooperation calculate the precoding matrix.
  • the precoding matrix is calculated by using channel information that does not include the feedback of the specified UE;
  • the priority of 701 is lower than the priority of other base stations 702
  • the designated UE is forcibly paired, and the precoding matrix is calculated by using the channel information fed back by the specified UE.
  • the UEs that are applicable to the resources are cooperatively selected in the UEs that are managed by the UEs.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.

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

Abstract

L'invention porte sur un procédé et un système de coopération de station de base. Le procédé comprend les opérations suivantes : une station de base initie une coopération déterminant une ressource à allouer à un équipement utilisateur (UE) ; et des stations de base dans un ensemble COMP autres que la station de base initiant une coopération sélectionnent, par coopération, un UE approprié pour la ressource à partir d'UE gérés par les autres stations de base, l'ensemble COMP comprenant toutes les stations de base aptes à allouer des ressources. Par l'intermédiaire de la présente invention, aucune contrainte de priorité n'existe dans la condition d'initiation de coopération, permettant ainsi d'augmenter de manière efficace les opportunités de coopération.
PCT/CN2012/073187 2011-08-11 2012-03-28 Procédé et système de coopération de station de base Ceased WO2012152148A1 (fr)

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