WO2012155695A1 - Nœud b évolué, système et procédé permettant de sélectionner un nœud de coopération - Google Patents

Nœud b évolué, système et procédé permettant de sélectionner un nœud de coopération Download PDF

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Publication number
WO2012155695A1
WO2012155695A1 PCT/CN2012/073180 CN2012073180W WO2012155695A1 WO 2012155695 A1 WO2012155695 A1 WO 2012155695A1 CN 2012073180 W CN2012073180 W CN 2012073180W WO 2012155695 A1 WO2012155695 A1 WO 2012155695A1
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cell
node
rsrp
information
load information
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Chinese (zh)
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陈思
郁光辉
李湧
谭中一
周文安
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ZTE Corp
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ZTE Corp
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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
    • H04B7/024—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 wireless communication technologies, and in particular, to a service base station, system, and method for cooperative node selection in a plurality of eNodeB cooperative joint multi-point processing scenarios.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the access technology adopted by the LTE system is Orthogonal Frequency Division Multiplexing (OFDM) technology.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the radio resource management of the LTE system has the characteristics of large bandwidth and multiple time processes.
  • the wireless resources appear in two dimensions of time and frequency, and the number of users that can be carried is greatly increased.
  • wireless signals from several neighboring base stations in the vicinity may be simultaneously received, and the transmitted wireless signals may also be received by multiple base stations in the vicinity.
  • multiple base stations can be coordinated to simultaneously receive and transmit uplink and downlink data of the UE.
  • C1 and C2 jointly serve UE1, and C3 and C2 jointly serve UE2.
  • the so-called CoMP (Coordinated Multiple Point) technology can be used to gain data diversity and spatial multiplexing for uplink and downlink wireless signals, improving the reliability and data throughput of wireless data transmission.
  • Multiple neighboring cells participating in CoMP cooperation may belong to the same eNodeB control or may belong to different eNodeBs (Inter eNodeBs).
  • the UE When the CoMP cooperation occurs on different eNodeBs, the UE only accepts the uplink and downlink resource scheduling commands on the downlink control channel (PDCCH) of one of the eNodeBs, and only uploads the HARQ feedback information and other measurement report information to the same eNodeB.
  • This eNodeB is called a Serving eNodeB.
  • the other eNodeBs are called Cooperative eNodeBs.
  • the set of Cooperative eNodeBs is called a Cooperative Node Set, which is called CoMP Cooperating Set.
  • the main target factors considered by the selected cooperative node are the signal to interference and noise ratio of the cooperative signal transmitted by the UE received by the UE, the signal delay, the cooperative node load, and the like.
  • the problem of considering load balancing is proposed, and a node with a low degree of load is selected as a cooperative node.
  • the above method considers the signal to interference and noise ratio information and the cooperative node load information separately, and is used to select different cooperation sets, and can obtain the optimality of a single target. But the intersection of the resulting collaboration sets may not be optimal for multiple goals.
  • the cooperative signal-to-noise ratio information and the cooperative node load information are respectively used to obtain two cooperation sets, the number of nodes included in the intersection of the two cooperation sets cannot be determined, and the number of nodes may be too large, and it is also possible Only get an empty collection. Therefore, it is necessary to provide a multi-objective decision-making based on a comprehensive analysis of the impact of different factors to solve the above problems.
  • the present invention provides a base station, a system, and a method for selecting a cooperative node, which can effectively solve the problem that a plurality of factors cannot be comprehensively selected when selecting a cooperative node.
  • a method of selecting a cooperative node comprising:
  • the serving base station selects one or more cell nodes as the cooperative nodes of the terminal from the potential cooperation set according to the load information of each cell in the potential cooperation set of the terminal and the reference signal received power RSRP of each of the cells.
  • the method further includes:
  • the serving base station After receiving the potential cooperation set information sent by the terminal, the serving base station requests load information of each cell to each cell base station in the potential cooperation set; the potential cooperation set information includes an identifier of each cell and an RSRP.
  • the potential cooperation set refers to the terminal measuring the largest one of the RSRP values of the neighboring cell Or a collection of multiple cells/base stations.
  • the step of the serving base station selecting one or more cell nodes as the cooperation nodes of the terminal from the potential cooperation set:
  • the serving base station combines the RSRP and the load information of each cell to represent the coordinates of the cell node, and combines the maximum value of the RSRP of each cell and the minimum value of the load information into an ideal node, and the maximum RSRP minimum value and load information of each cell.
  • the value combination is a negative ideal node; the serving base station calculates a distance between each of the cell nodes in the potential cooperation set and the ideal node, and a distance between the negative ideal node, and calculates one or more of the largest ratios
  • the cell node or the cell node whose selection ratio/greater than the preset threshold is used as the cooperation node.
  • the serving base station combines RSRP and load information of each cell to indicate the coordinates of the cell node, and combines the maximum value of the RSRP of each cell and the minimum value of the load information into an ideal node, and the RSRP minimum value and load information of each cell.
  • the maximum value is combined into a negative ideal node; the serving base station calculates a distance between each of the cell nodes in the potential cooperation set and the ideal node and a distance s from the negative ideal node; and the steps include:
  • the serving base station expresses the cell node coordinates as ( , ), where i represents the i th cell, and the x is the RSRP information of the cell node, and is the negative of the cell node.
  • the maximum value is the RSRP cell node information
  • the load information 3 ⁇ 4 cell node when the load information 3 ⁇ 4 cell node, the maximum value of each cell is provided for information RSRP /! +, The minimum value of RSRP information / load information of each cell is r 2 -
  • the minimum value of the load information in each cell is:
  • the load information of the cell node is the RSRP information of the cell node
  • the minimum value of the load information in each cell is /!+
  • the maximum value of the load information is /
  • the minimum value of the RSRP information in each cell is ⁇ -
  • the serving base station combines RSRP and load information of each cell to indicate the coordinates of the cell node, and combines the maximum value of the RSRP of each cell and the minimum value of the load information into an ideal node, and the RSRP minimum value and load information of each cell.
  • the maximum value is combined into a negative ideal node;
  • the step of calculating, by the serving base station, the distance between each of the cell nodes in the potential cooperation set and the ideal node and the distance between the negative ideal nodes includes: It is ( , ) , where i represents the i-th cell, and the 3 ⁇ 4 is the RSRP information of the cell node, and the 3 ⁇ 4 is the negative of the cell node.
  • the maximum value of the RSRP information in the matrix V is, the minimum value of the RSRP information is /, and the maximum value of the load information in each cell is r 2 -
  • the minimum value of the load information in the cell is: when the load information of the cell node is the RSRP information of the cell node, the minimum value of the load information in the matrix V is, and the maximum value of the load information is /, and the RSRP information in each cell
  • the minimum value is ⁇ -
  • the maximum value of RSRP information in each cell is r 2 +
  • the ideal node is ( , v 2 + ) and the negative ideal node is ( , V- ), and the coordinates of each cell node are further represented. For ( v 'i , v ' 2 ) ;
  • a service base station that selects a cooperative node, where:
  • the serving base station is configured to: select one or more neighboring cell nodes from the potential cooperation set as the terminal according to load information of each cell in a potential cooperation set of the terminal and reference signal received power RSRP of the cell Collaboration node. among them:
  • the serving base station is further configured to: after receiving the potential cooperation set information sent by the terminal, request load information of each cell from each cell base station in the potential cooperation set; the potential cooperation set information includes an identifier of each cell And RSRP.
  • the potential cooperation set is a set of one or more cells/base stations that the terminal measures the largest of the RSRP values of the neighboring cells.
  • the serving base station is configured to select one or more neighboring cell nodes from the potential cooperation set as the cooperation node of the terminal in the following manner:
  • the cell node acts as a collaboration node.
  • the serving base station is configured to combine the RSRP and the load information of each cell to represent the cell node coordinates, and combine the RSRP maximum value of each cell and the minimum value of the load information into an ideal node, and the RSRP minimum value is The maximum value of the load information is combined into a negative ideal node; the distance between each cell node in the potential cooperation set and the ideal node and the distance from the negative ideal node are calculated:
  • the cell node coordinates are represented as ( ), where i represents the i th cell, the 3 ⁇ 4
  • each The minimum value of the load information in the cell is: when the load information of the cell node is the RSRP information of the cell node, the minimum value of the load information in each cell is /!+, and the maximum value of the load information is /, each cell
  • the minimum value of the RSRP information is ⁇ -
  • the number of coordinates of each cell node is formed as follows: normalized target matrix
  • the maximum value of the RSRP information in the matrix V is, the minimum value of the RSRP information is /, and the maximum value of the load information in each cell is r 2 - , a matrix
  • the minimum value of the load information in V is: when the load information of the cell node is the RSRP information of the cell node, the minimum value of the load information in each cell is /!+, and the maximum value of the load information is /, each cell
  • the minimum value of the RSRP information is ⁇ -
  • the maximum value of the RSRP information in each cell is r 2 +
  • the ideal node is ( , v 2 + ) and the negative ideal node is ( , V- )
  • the nodes of each cell One step is expressed as ( v 'i , v ' 2 ) ;
  • a system for selecting a cooperative node comprising: a terminal and any one of the serving base stations as described above; a reference signal receiving power RSRP, selecting N cells in which the RSRP is the largest as a potential cooperation set, and transmitting the potential cooperation set information to the
  • the serving base station the potential cooperation set information includes identifiers of N of the cells and an RSRP thereof.
  • the terminal needs to select a cooperative node, measure the RSRP of the neighboring cell or the measurement set cell, select the N cells with the largest RSRP as the potential cooperation set, and send the potential cooperation set information to the serving base station, the potential collaboration
  • the set information includes an identifier of the N cells and its RSRP.
  • the cooperative node selection strategy of the above technical solution comprehensively analyzes the influence of different factors based on multi-objective decision making, and utilizes the specifications and protocols of the existing system to the utmost extent, with few changes and simple implementation. Not only comprehensively consider the influence of different factors, but also adjust the influence weight of different factors through practice feedback, which can solve the problem of selecting the set of cooperative nodes.
  • BRIEF abstract 1 is a schematic diagram of a network structure for performing joint processing of multiple eNodeBs by using CoMP technology
  • FIG. 2 is a flowchart of a method for selecting cooperative nodes in Embodiment 4 of the present invention
  • FIG. 3 is a flowchart of a method for selecting a cooperative node according to Embodiment 5 of the present invention. Preferred embodiment of the invention
  • the inventors believe that the most feasible target at present is to reflect the reference signal receiving power (RSRP, Reference Signal Receiving Power) of the signal to interference and noise ratio information and the system resource utilization reflecting the load information of the cooperative node. Rate (Total PRB usage).
  • RSRP Reference Signal Receiving Power
  • the LTE network supports the RSRP measurement function. During cell access and cell re-access,
  • the UE will automatically search for RSRP at different frequencies in the E-UTRAN.
  • the RSRP measurement and loopback reporting mechanism has been determined.
  • the RSRP information of the coordinated cell in the measurement set is obtained by making minimal modifications to the existing standards in the CoMP.
  • the LTE network supports the measurement function of Total PRB usage, which is fed back to the serving eNodeB through the X2 interface by the eNodeB in the measurement set.
  • the periodic notification mechanism between existing eNodeBs can bear the load messaging between eNodeBs.
  • the capacity of the fiber-based X2 interface is sufficient to cover the overhead of transmitting load information.
  • the LTE network After receiving the CoMP request from the UE, the LTE network obtains the RSRP information and the Total PRB usage information of the cell in the measurement set of the UE through the feedback of the UE and X2.
  • the impact of different factors is considered by using a multi-objective decision-making approach.
  • a decision matrix is proposed. Through the practice feedback to adjust the impact weights of different factors, choose the best set of collaborative nodes.
  • the present invention provides a base station, a system, and a method for selecting a cooperative node.
  • the serving eNodeB selects one or more from the potential cooperation set according to load information of each cell in the potential cooperation set of the terminal and reference signal received power RSRP of the cell.
  • the neighboring base stations serve as cooperative nodes of the terminal.
  • This embodiment provides a service eNodeB that selects a cooperative node, and the service eNodeB sets According to the load information of each cell in the potential cooperation set of the terminal and the reference signal received power RSRP of the cell, one or more cell nodes (ie, neighboring base stations) are selected from the potential cooperation set as the cooperative node of the terminal.
  • the serving eNodeB is further configured to: after receiving the potential cooperation set information sent by the terminal, request the load information from each cell base station in the potential cooperation set; the potential cooperation set information includes an identifier of each cell and an RSRP.
  • a potential cooperative set refers to a set of one or more cells/base stations in which the terminal measures the largest RSRP value of a neighboring cell.
  • the serving eNodeB is arranged to select one or more cell nodes from the above-mentioned potential coordination set as a cooperative node of the terminal in the following manner:
  • the serving eNodeB combines the RSRP and the load information of each cell to represent the coordinates of the cell node, and combines the maximum value of the RSRP maximum value of each cell and the load information into an ideal node, and combines the minimum value of the RSRP minimum value and the load information into Negative ideal node;
  • the serving eNodeB calculates a distance between each of the cell nodes in the potential collaboration set and the ideal node and a distance from the negative ideal node, and calculates a selection M to select the largest M or a selection ratio / greater than a preset threshold
  • the cell node acts as a collaboration node.
  • the eNodeB expresses the coordinates of the cell node as ( , r i2 ), where i represents the i-th cell, and 3 ⁇ 4 is the RSRP information or load information of the cell node,
  • the present embodiment provides a service eNodeB that selects a cooperative node, and the service eNodeB is configured to: select one or more from the foregoing potential cooperation set according to load information of each cell in the potential cooperation set of the terminal and reference signal received power RSRP of the cell.
  • a plurality of adjacent base stations serve as cooperative nodes of the terminal.
  • the serving eNodeB is further configured to: after receiving the potential cooperation set information sent by the terminal, requesting load information from each cell base station in the potential cooperation set; the potential cooperation set information includes an identifier of each cell and an RSRP.
  • a potential cooperative set refers to a set of one or more cells/base stations in which the terminal measures the largest RSRP value of a neighboring cell.
  • the serving eNodeB is arranged to select one or more cell nodes from the above-mentioned potential coordination set as a cooperative node of the terminal in the following manner:
  • the node acts as a collaboration node.
  • the serving eNodeB expresses the cell node coordinates as ( , r i2 ) , where i represents the i th cell, and the 3 ⁇ 4 is the RSRP information or the load signal of the cell node.
  • the weight matrix W is the same as described in the fifth embodiment.
  • the serving eNodeB is further configured to: use the decision weight matrix to perform the weighted normalized decision matrix calculated by the normalized target matrix R as follows:
  • each cell When the RSRP information of the cell node is the load information of the cell node, the maximum value of the RSRP information in each cell is, the minimum value of the RSRP information is /, and the maximum value of the load information in each cell is r 2 - , each The minimum value of the load information in the cell is: when the load information of the cell node is the RSRP information of the cell node, the minimum value of the load information in each cell is /!+, and the maximum value of the load information is /, each cell The minimum value of the RSRP information is ⁇ - , and the maximum value of the RSRP information in each cell is r+, then the ideal node is ( , v 2 + ) and the negative ideal node is ( , V- );
  • the embodiment provides a system for selecting a cooperative node, including a terminal and a service eNodeB as described in the first embodiment or the second embodiment;
  • the terminal is configured to: when the coordinated node needs to be selected, measure the RSRP of the neighboring cell or the measurement set cell, select the N cells with the largest RSRP as the potential cooperation set U1, and send the potential cooperation set U1 information to the service.
  • the eNodeB, the potential cooperation set information includes identifiers of N cells and their RSRP strength.
  • the embodiment provides a method for selecting a cooperative node.
  • the serving base station selects one or more neighboring base stations from the potential cooperation set according to the load information of each cell in the potential cooperation set of the terminal and the reference signal received power RSRP of the cell.
  • RSRP reference signal received power
  • the UE When the UE needs CoMP, the UE starts a process of measuring a reference signal received power RSRP of a neighboring cell or a measurement set cell, and arranges the measured results in descending order: the measurement set is a pre-configured set of cells for measurement, which is all or Partially adjacent cells.
  • n is the number of measured cells.
  • the UE selects the first N (N ⁇ n) cells with the strong RSRP strength as the potential cooperation set U1, and sends the data to the serving eNodeB through the uplink channel, where the message carries the identifier of the cell in the U1 set and the RSRP. strength.
  • the serving eNodeB After receiving the feedback information of the UE (that is, the RSRP strength of the cell in the U1 set), the serving eNodeB communicates with the base station of each cell in the U1 set through the X2 interface, and requests the load information of each cell in the U1 set (Total PRB usage ).
  • the serving eNodeB receives the load information of the cell in the Ul set, and combines the RSRP information of each cell in the U1 set to represent the cell node coordinates.
  • the service eNodeB combines the maximum RSRP value of each cell and the minimum value of the load information into an ideal node, and combines the minimum value of the RSRP minimum value and the load information into a negative ideal node;
  • the maximum value of the RSRP information in each cell is, the minimum value of the RSRP information is /, and the maximum value of the load information in each cell is r 2 - , each The minimum value of the load information in the cell is, when it is the load signal of the cell node
  • the minimum value of the load information in each cell is /!+, the maximum value of the load information is /, and the minimum value of the RSRP information in each cell is ⁇ - , and the RSRP information in each cell
  • the maximum value is r 2 + ; then the ideal node is (r , V ) and the negative ideal node is (r ", r- );
  • C can be further normalized.
  • the serving eNodeB sorts the relative ideal proximity of each cell, selects the largest M (M ⁇ N) cell nodes as the cooperative node or selects the cell node whose relative ideal proximity is above the threshold as the cooperative node.
  • the serving eNodeB After determining the set of cooperative nodes, the serving eNodeB will send a specific message to the coordinated cell and the UE to perform the remaining operations of the CoMP.
  • Embodiment 5 After determining the set of cooperative nodes, the serving eNodeB will send a specific message to the coordinated cell and the UE to perform the remaining operations of the CoMP.
  • This embodiment provides another method for selecting a collaboration node, including the following steps:
  • the UE starts a process of measuring a reference signal received power RSRP of a neighboring cell or a measurement set cell when the CoMP is required, and the measurement result is arranged in descending order: the measurement set is a pre-configured cell set for measurement, which is all or Partially adjacent cells.
  • S202 The UE selects the first N (N ⁇ n) cells with the strong RSRP strength as the potential cooperation set U1, and sends the data to the serving eNodeB through the uplink channel, where the message carries the identifier of the cell in the U1 set and the RSRP. strength.
  • the serving eNodeB receives the feedback information of the UE (that is, the cell in the U1 set). After RSRP strength, the X2 interface communicates with the base stations of each cell in the U1 set, and requests the load information (Total PRB usage) of each cell in the U1 set.
  • the serving eNodeB receives the load information of the cell in the Ul set, and combines the RSRP information of each cell in the U1 set to represent the node coordinates of the cell;
  • the serving eNodeB forms the coordinates of each cell node into the following normalized target matrix R:
  • the decision weight matrix reflects the effects of different factors. Here you can use but not limited to using the entropy method (without introducing subjective judgment) to determine the weight, or the square root method (introducing subjective judgment). Moreover, the decision weight matrix can be adjusted through practical feedback to optimize the actual effect.
  • the square root method compares the target (RSRP and load information) in pairs and obtains the relative weight value between the two targets.
  • the weight relative value is determined by subjective evaluation.
  • the weight of the relative weight of a target is multiplied by the square root to obtain its root weight value.
  • the square root weight values of all the targets are normalized to obtain the target weight matrix.
  • the entropy method refers to calculating the entropy value of the target.
  • the entropy value is small, indicating that the effective information of the target is large and its weight should be large; otherwise, if a target The difference between the values is small and the entropy value is large, indicating that the amount of information provided by the indicator is small and its weight should be small.
  • Calculate the entropy values of each target then calculate their entropy weights, and finally normalize the processing to obtain the target weight matrix. Since the entropy value of the target is determined by objective data, the target weight matrix obtained by this method is objective.
  • the purpose of the above methods is to evaluate the impact of different targets on different targets.
  • the impact of energy can be given a larger weight value for a target with a large performance impact, and a smaller weight value for a target with a smaller performance impact, thereby obtaining a target weight matrix.
  • the assessment of the target will vary depending on the network conditions. For example, when the channel quality is poor, the improvement of information quality caused by the increase of RSRP is very important. At this time, the CoMP performance is sensitive to the change of RSRP, and the RSRP is given a larger weight value; when the load is high, PRB Usage If it is reduced, it can provide collaborative resources. CoMP performance is more sensitive to changes in PRB usage. At this time, the PRB usage has a high weight value.
  • the coordinates of each cell node can be further expressed as ( v a , .
  • S206 The service eNodeB determines an ideal node and a negative ideal node.
  • the RSRP strength in the ideal cooperative node should be as large as possible, taking the maximum value.
  • the load of the ideal cooperative node is as small as possible, taking the minimum value.
  • the maximum value of the RSRP strength and the minimum value of the cooperative node load information are combined as the ideal node:
  • the maximum value of the RSRP information in the matrix V is set to be RSRP information.
  • the minimum value is /
  • the maximum value of the load information in each cell is r 2 -
  • the minimum value of the load information in each cell is, when the load information of the cell node is 3 ⁇ 4 is the RSRP information of the cell node, the load in each cell is set.
  • the minimum value of the information is / !+
  • the maximum value of the load information is /
  • the minimum value of the RSRP information in each cell is ⁇ -
  • the maximum value of the RSRP information in each cell is r 2 +
  • the ideal node is ( , ;
  • the negative ideal node is ( Vl - , V- ) ;
  • the serving eNodeB calculates the distance between each node and the ideal node and the distance of the negative ideal node, and the relative ideal proximity.
  • Distance from ideal node In the formula, i denotes a cell identifier, indicating the distance between the i-th cell and the ideal node.
  • the ⁇ can be further normalized.
  • the serving eNodeB sorts the relative ideal proximity of each cell, selects the largest M (M ⁇ N) cell nodes as the cooperative node, or selects the cell node whose relative ideal proximity is above the threshold as the cooperative node.
  • the serving eNodeB After determining the set of cooperative nodes, the serving eNodeB will send a specific message to the coordinated cell and the UE to perform the remaining operations of the CoMP.
  • the cooperative node selection strategy of the above technical solution comprehensively analyzes the influence of different factors based on multi-objective decision making, and utilizes the specifications and protocols of the existing system to the utmost extent, with few changes and simple implementation. Not only comprehensively consider the influence of different factors, but also adjust the influence weight of different factors through practice feedback, which can solve the problem of selecting the set of cooperative nodes. Therefore, the present invention has strong industrial applicability.

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Abstract

La présente invention se rapporte à un procédé, à un nœud B évolué de desserte et à un système permettant de sélectionner un nœud de coopération, le procédé comprenant les étapes suivantes : un nœud B évolué de desserte sélectionne un ou plusieurs nœuds de cellule parmi un ensemble de coopération de communication multipoint coordonnée (CoMP) potentiel comme étant le nœud de coopération d'un terminal selon les informations de charge de chaque cellule de l'ensemble de coopération de communication CoMP potentiel du terminal et la puissance de réception de signal de référence (RSRP pour Reference Signal Received Power) de chaque cellule. La politique pour sélectionner un nœud de coopération de la solution technique susmentionnée analyse en détail l'impact provoqué par différents facteurs sur la base d'une décision multiobjectif, et permet une utilisation optimale de la spécification et du protocole dans un système existant, peu de modifications étant nécessaires. Ladite politique, est simple à mettre en œuvre. Ainsi, non seulement l'impact provoqué par différents facteurs est pris en compte de manière globale, mais le poids de l'impact des différents facteurs peut être également ajusté par l'intermédiaire d'une rétroaction effective, ce qui permet de résoudre le problème de sélection d'un ensemble de coopération de communication CoMP.
PCT/CN2012/073180 2011-07-29 2012-03-28 Nœud b évolué, système et procédé permettant de sélectionner un nœud de coopération Ceased WO2012155695A1 (fr)

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