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WO2011038542A1 - Procédé et équipement d'estimation de condition de canal de liaison descendante - Google Patents

Procédé et équipement d'estimation de condition de canal de liaison descendante Download PDF

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Publication number
WO2011038542A1
WO2011038542A1 PCT/CN2009/074315 CN2009074315W WO2011038542A1 WO 2011038542 A1 WO2011038542 A1 WO 2011038542A1 CN 2009074315 W CN2009074315 W CN 2009074315W WO 2011038542 A1 WO2011038542 A1 WO 2011038542A1
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WO
WIPO (PCT)
Prior art keywords
node
user terminal
reference signal
power
received
Prior art date
Application number
PCT/CN2009/074315
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English (en)
Chinese (zh)
Inventor
王栋耀
庞继勇
刘建国
沈钢
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to CN200980159875.3A priority Critical patent/CN102474868B/zh
Priority to PCT/CN2009/074315 priority patent/WO2011038542A1/fr
Publication of WO2011038542A1 publication Critical patent/WO2011038542A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network

Definitions

  • the present invention relates to a method and apparatus for estimating channel conditions for a downlink, and more particularly to a method and apparatus for estimating channel conditions for a downlink in a relay network. Background technique
  • the quality of the signal received by the user depends on the channel quality between the user and the cell to which it belongs, the level of interference from other cells, and the level of noise.
  • the base station's transmitter needs to perform a corresponding rate match based on the change in signal quality received by each user, i.e., the link adaptation as is commonly referred to.
  • the main process of link adaptation is as follows. First, the user terminal measures the channel conditions of its downlink, such as the signal to interference and noise ratio of the received signal.
  • the user terminal then feeds back the measured channel conditions of the downlink to the base station.
  • the base station After receiving the channel condition sent by the user terminal, the base station selects the downlink modulation mode and the coding rate of the downlink communication with the user terminal according to the channel condition.
  • a Channel Quality Indication identifies a channel condition and is used to indicate a supported data rate.
  • the user terminal After measuring the signal to interference and noise ratio of the received signal in the mth subframe, the user terminal feeds back its detected channel condition to the base station eNodeB (evolved NodeB) in the form of CQI considering its own receiver characteristics.
  • the base station eNodeB uses the received CQI feedback of the user terminal as a reference to determine the modulation mode and the coding rate of the downlink corresponding to the user terminal on the m+kth subframe.
  • the base station eNodeB can use the downlink channel condition measured by the user terminal in the mth subframe as a reference to determine that the user terminal is at the m+th The modulation scheme and coding rate of the downlink of k subframes.
  • the link adaptation method that works in a cellular communication system does not achieve the same effect in a cellular communication system that introduces a relay mode.
  • a cellular communication system incorporating a relay mode there is one base station eNodeB in one cell and a plurality of slave relay nodes of the base station eNodeB.
  • they adopt the orthogonal transmission mode only one node (base station eNodeB or relay node) transmits data in one subframe, which results in different nodes may be transmitting data in different subframes.
  • both the base station eNodeB and the relay node interfere with the received signal of the user terminal. Due to the different locations of different nodes, different nodes have different interferences to one user terminal. For a user terminal, the node whose system is in the transmitting state in the mth subframe may be completely different from the node in which the system is in the transmitting state of the m+kth subframe. Therefore, the interference level experienced by the user terminal in the mth subframe may be significantly different from the interference level experienced by the user terminal in the m+kth subframe.
  • the selected modulation scheme and coding scheme cannot be combined with the m+kth subframe.
  • the channel conditions of the frames are matched, so not only can the performance of the system not be optimized, but the performance of the system can be degraded.
  • a method of estimating a downlink channel condition of a user terminal on a resource block in a network device of a relay network includes the steps of:
  • the network device can acquire the transmission status of each node on a certain resource block, and can understand the power information of a node related to one user terminal (for example, a node that interferes with the user terminal), as long as the location of the user terminal does not occur.
  • the network device can estimate the channel conditions of the downlink of the user terminal on a resource block. Even if the location of the user terminal changes, the power information of the node related to the user terminal may be updated periodically or non-periodically, so that the network device can still accurately estimate the downlink of the user terminal on one resource block. Channel conditions. Therefore, even if the transmission states of the nodes on different resource blocks are different, the channel conditions of the downlink on different resource blocks can be estimated relatively accurately.
  • the user terminal can assist the network device in completing the estimation of the channel conditions of its downlink on a certain resource block by transmitting a node (e.g., a node for which interference is generated) and power information associated with it.
  • a node e.g., a node for which interference is generated
  • power information associated with it e.g., a node for which interference is generated
  • the channel conditions of the downlinks on different resource blocks can be estimated relatively accurately.
  • the user terminal sends a service node receiving power data, which is used to indicate information about the power of the reference signal transmitted by a serving node to which the user terminal belongs, which is received by the user terminal;
  • the user terminal determines, according to the received power of the reference signal sent by the plurality of nodes, that the at least one node is a node related to the user terminal;
  • the user terminal sends a node identification data for indicating an identity of the at least one node
  • the user terminal transmits a node reference signal received power data for indicating information about the power of the reference signal transmitted by the at least one node received by the user terminal;
  • the network device receives the node identification data
  • the network device receives the node reference signal received power data
  • a network device for use in a relay network for estimating a downlink channel condition of a user terminal on a resource block.
  • the network device includes:
  • a receiver for receiving a service node receiving power data, the service node receiving power data for indicating information about a power of a reference signal transmitted by a serving node to which the user terminal belongs, which is received by the user terminal
  • the receiver is further configured to receive a node identification data, where the node identification data is used to indicate an identifier of at least one node associated with the user terminal,
  • the receiver is further configured to receive a node reference signal received power data, where the node reference signal received power data is used to indicate information about the power of the reference signal transmitted by the at least one node received by the user terminal;
  • a first device configured to acquire transmission status information of the at least one node on the resource block
  • a second device configured to estimate, according to the serving node receiving power data, the node identification data, the node reference signal receiving power data, and the sending status information, the user terminal on the resource block The channel condition of the downlink.
  • a user terminal for providing feedback information in a relay network includes:
  • a first device configured to determine, according to the received power of the reference signal sent by the plurality of nodes, the at least one node is a node related to the user terminal;
  • a transmitter for transmitting a node identification data, the node identification data being used to indicate an identifier of the at least one node;
  • the transmitter is further configured to send a node reference signal received power data, where the node reference signal received power data is used to indicate the at least one received by the user terminal Information about the power of the reference signal transmitted by the nodes;
  • the transmitter is further configured to send a serving node to receive power data, where the serving node receives power data for indicating, by the user terminal, related information about a power of a reference signal transmitted by a serving node to which the user terminal belongs.
  • FIG. 1 is a flow chart of a method for estimating a downlink channel condition of a user terminal on a resource block in a network device of a relay network according to an embodiment of the present invention
  • FIG. 2 is a diagram of a method according to an embodiment of the present invention.
  • FIG. 3 is a flow chart of a method for estimating a downlink channel condition of a user terminal on a resource block by a network device in a relay network according to an embodiment of the present invention
  • FIG. 4 is another embodiment of the present invention.
  • Figure 5 is a schematic block diagram of a network device in accordance with one embodiment of the present invention.
  • Figure 6 is a schematic block diagram of a user terminal in accordance with one embodiment of the present invention.
  • FIG. 1 is a flow chart of a method for estimating a downlink channel condition of a user terminal on a resource block in a network device of a relay network, in accordance with one embodiment of the present invention.
  • the relay network may be a self-organizing network or a multi-hop network, or may be a cellular communication network that introduces a relay.
  • the network device may be a base station (e.g., a base station eNodeB) or a relay station or the like.
  • the user terminal can be a mobile device or a fixed device.
  • a resource block can be determined by frequency, codeword or time, and the like.
  • the downlink refers to a link in which a user terminal receives a transmission signal of a base station or a relay station.
  • the network device receives a serving node receiving power data, which is used to indicate information about the power of the reference signal transmitted by a serving node to which the user terminal belongs, which is received by the user terminal. .
  • the node to which the user terminal belongs is the node that directly transmits and receives data to and from the user terminal.
  • the serving node may be the node closest to the user terminal or the node with the least transmission loss between the user terminal and the like.
  • the information about the power of the reference signal transmitted by the serving node received by the user terminal can be indicated in a variety of ways. For example, a table is predefined in which the power levels corresponding to different powers are listed, such as 100 watts to 150 watts of power corresponding to power level 3.
  • the network device can know the power range corresponding to the power level information by receiving the power level information of the service node, and then take a value (such as an intermediate value, a maximum value or a minimum value) in the power range as corresponding to the service.
  • the received power of the node For another example, the power value is converted into a component, and then a number of bits are allocated to represent the power value, for example, 10 bits can represent 1024 power values.
  • the network device receives information about the power of the reference signal of the new service node.
  • step 120 the network device receives a node identification data for indicating an identity of at least one node associated with the user terminal.
  • the network device may receive the identity of at least one node directly from the user terminal or may receive the identity of at least one node through another network device.
  • a node can be a base station or a relay station.
  • At least one node associated with the user terminal can be determined in a variety of ways.
  • at least one node can be determined by the user terminal, for example, the user terminal can All nodes of the nodes that receive the reference signal except the serving node are determined to be at least one node associated therewith.
  • at least one node may also be determined by the network device.
  • the network device selects a node closer to the user terminal as a user and a node in the node other than the service node according to the location of the node in the communication network and the location of the user terminal. At least one node associated.
  • the network device receives a node reference signal received power data for indicating information about the power of the reference signal transmitted by the at least one node received by the user terminal.
  • the transmitted reference signal of a node is the channel measurement and estimation transmitted by the node for the downlink, and the signal of the cell search.
  • a cell-specific reference signal RS, Reference Signal
  • LTE Long Term Evolution
  • the information about the power of the reference signal transmitted by the at least one node received by the user terminal can be indicated in a variety of ways.
  • the specific manner may be the same as the foregoing information indicating the information about the power of the reference signal transmitted by the serving node received by the user terminal, and details are not described herein again.
  • Step 120 and step 130 may be performed simultaneously or separately.
  • the network device receives the node identification data and the node reference signal received power data at the same time, and a node identifier is followed by the received power related information of the node corresponding to the node identifier.
  • the network device first receives the node identification data, where the three node identifiers are included, and then receives the node reference signal received power data, which includes the received power related information of the three nodes, and the arrangement order and the order of the three node identifiers. the same.
  • the received node reference signal received power data corresponds to the node identification data received by the network device last time.
  • Step 110, step 120, and step 130 may be performed simultaneously or separately.
  • the received power related information of the reference signal of the serving node is placed before or after the received power related information of the reference signal of the node associated with the user terminal.
  • the network device acquires transmission status information of the at least one node on the resource block.
  • the sending status information of a node can be expressed in a variety of ways. For example, if a node's transmission status on a resource block is transmission, the node's transmission status on the resource block is marked as 1; if a node's transmission status on a resource block is not sent, the node The transmission status on this resource block is marked as 0.
  • the network device can obtain the transmission status information of at least one node on one resource block in multiple manners. For example, the network device stores the transmission status information of the plurality of nodes of the relay network on the plurality of resource blocks in the future, and the network device acquires the transmission status information of the at least one node on the one resource block from the stored information. For another example, a first network device in the relay network stores transmission status information of multiple nodes of the relay network on multiple resource blocks in the future, and a second network device may store information from the first network device. Obtaining transmission status information of at least one node on one resource block.
  • the network device estimates the downlink of the user terminal on the resource block according to the service node receiving power data, the node identification data, the node reference signal receiving power data, and the sending status information of the at least one node on the resource block.
  • the channel condition of the link is
  • the channel conditions are affected by various factors, such as the interference of other communication links to the user terminal or the transmission loss between the node and the user terminal transmitted to the user terminal data.
  • the channel conditions can be characterized in a number of ways, such as interference experienced by the user terminal, signal to interference and noise ratio of the signal received by the user terminal, or signal to interference ratio.
  • the network device can estimate the channel conditions of the downlink of the user terminal on one resource block in a variety of ways.
  • the channel condition of the downlink of the user terminal on one resource block is estimated by using the signal to interference and noise ratio calculated in Equation 1, where the power of the reference signal sent by the serving node received by the user terminal, and the user At least one node associated with the terminal is node 1 to node k, P.
  • the signal to interference and noise ratio calculated in Equation 1, where the power of the reference signal sent by the serving node received by the user terminal, and the user At least one node associated with the terminal is node 1 to node k, P.
  • a corresponding to the node is 1, when a node is in the When no data is sent on the resource block, A corresponding to the node is 0, « is thermal noise.
  • SINR " ⁇ s - Equation 1
  • the channel condition can also be estimated by estimating the signal-to-interference ratio of the downlink received reference signal of the user terminal on one resource block.
  • the method further includes the step of the network device determining a resource scheduling scheme for the downlink communication of the user terminal on the resource block based on the estimated channel condition.
  • the resource scheduling scheme includes at least one of the following resource scheduling items: transport block size, modulation scheme, or coding rate.
  • the resource scheduling scheme may also include the transmit power of the data signal transmitted to the user terminal in the downlink.
  • the network device selects a corresponding CQI indication according to the estimated signal to noise ratio to achieve the purpose of resource scheduling.
  • 2 is a flow chart of a method of providing feedback information in a user terminal in a relay network, in accordance with one embodiment of the present invention.
  • a method of providing feedback information in a user terminal in a relay network According to an embodiment of the second aspect of the present invention, there is provided a method of providing feedback information in a user terminal in a relay network.
  • step 210 the user terminal sends a service node to receive power data, which is used to indicate information about the power of the reference signal transmitted by a service node to which the user terminal belongs, which is received by the user terminal.
  • the user terminal detects the reference signals of the multiple nodes in the relay network, and selects a node as the service node to which the user terminal belongs according to the result of the detection, for example, selecting the node with the strongest reference signal received by the user as the node. Service node.
  • the user terminal performs direct information interaction with the selected service node.
  • the manner in which the user terminal sends the service node to receive the power data corresponds to the manner described in the foregoing step 110, and details are not described herein again.
  • the user terminal determines, according to the received power of the reference signal sent by the plurality of nodes, that the at least one node is a node related to the user terminal.
  • the power of the reference signal of one node measured by the user terminal is the power measured on one resource block, and the size of the resource block may be the same as or different from the size of the resource block in the embodiment in which the network device performs channel condition estimation.
  • the method for the user terminal to measure the power of the reference signal of one node and the plurality of nodes may be the same as the method for receiving the reference signal power in the cell search and the cell handover in the existing cellular communication system, and details are not described herein again.
  • the user terminal can determine at least one node associated with the user terminal in a variety of ways. For example, a power threshold is preset, and if the power value of a node reference signal received by the user terminal exceeds the power threshold, the user terminal determines the node as one of at least one node related to the user terminal. node.
  • a power ratio threshold is preset, and if the ratio of the received power of the reference signal received by the user terminal to the reference signal power of the serving node received by the user terminal is greater than the power ratio threshold, the user The terminal determines the node as one of at least one node associated with the user terminal.
  • step 230 the user terminal transmits a node identification data for indicating the identity of the at least one node.
  • the identity of a node can be obtained in a variety of ways.
  • a cell identity can obtain a cell ID by detecting a synchronization channel.
  • the user terminal transmits a node reference signal received power data for indicating information about the power of the reference signal transmitted by the at least one node received by the user terminal.
  • a method of estimating, by a network device, a downlink channel condition of a user terminal on a resource block in a relay network comprises the following steps: - the user terminal sends a service node receiving power data, which is used to indicate information about the power of the reference signal transmitted by a serving node to which the user terminal belongs, which is received by the user terminal;
  • the user terminal determines, according to the received power of the reference signal sent by the plurality of nodes, that the at least one node is a node related to the user terminal;
  • the user terminal sends a node identification data indicating the identity of the at least one node
  • the user terminal transmits a node reference signal received power data for indicating information about the power of the reference signal transmitted by the at least one node received by the user terminal;
  • the network device receives the service node receiving power data
  • the network device receives the node identification data
  • the network device receives the node reference signal received power data
  • the network device acquires transmission status information of the at least one node on the resource block
  • the network device estimates the channel condition of the downlink of the user terminal on the resource block based on the serving node receiving power data, node identification data, node reference signal received power data, and transmission status information.
  • the operation of the network device and the user terminal described in the above-described embodiments corresponding to the first aspect and the second aspect of the present invention can be applied to the third aspect of the present invention, that is, one network device estimation in the relay network A method in which a user terminal is in a downlink channel condition on a resource block.
  • FIGS. 3 and 4 is a flow diagram of a method for estimating, by a network device, a downlink channel condition of a user terminal on a resource block in a relay network, in accordance with an embodiment of the present invention.
  • the network device base station eNodeB is a service node of the user terminal.
  • the network device base station eNodeB is a service node of the user terminal.
  • step 301 the user terminal attempts to measure the received power of the reference signals of the plurality of nodes N1 to N10 in the relay system.
  • step 302 the user terminal finds that the reference signal receiving power corresponding to the node N3 (ie, the base station eNodeB) is the largest through the cell search, and thus determines that the base station eNodeB is the serving node.
  • step 303 the reference signal received power corresponding to the base station eNodeB is transmitted to the base station eNodeB through the serving node received power data.
  • the user terminal detects the reference signals of the four nodes N1, N4, N6, and N8, and the received power corresponding to the reference signals of the four nodes corresponds to the base station.
  • the received power of the reference signal of the eNodeB is divided, and it is found that the ratio of the received power corresponding to the nodes N4 and N6 is greater than the predefined power ratio threshold value of 0.1. The user therefore determines that nodes N4 and N6 are nodes associated with the user terminal.
  • step 305 the user terminal transmits the node identifiers of the nodes N4 and N6 to the base station eNodeB through the node identification data.
  • step 306 the user terminal transmits the reference signal received power corresponding to the nodes N4 and N6 to the base station eNodeB through the node reference signal received power data.
  • step 307 the base station eNodeB determines, by storing the scheduling information, that in the eighth subframe, N4 transmits data, and N6 does not transmit data.
  • the base station eNodeB estimates the signal to interference and noise ratio of the user terminal on the eighth subframe, wherein the signal is the reference signal received power corresponding to the base station eNodeB, and the interference is the reference signal received power corresponding to the node N4.
  • the base station eNodeB determines, according to the estimated signal to interference and noise ratio of the user terminal of the eighth subframe, that the resource scheduling scheme of the user equipment on the eighth subframe is a QPSK modulation scheme and a coding rate of 2/3. . And in step 310, the determined scheme is sent to the user terminal in the manner indicated by CQI.
  • step 311 the user terminal finds that the associated at least one node becomes N1 and N8 due to the movement of the user terminal.
  • the user terminal and the base station eNodeB then repeat the operations similar to steps 305 through 310 above.
  • 4 is a flow diagram of a method for a network device to estimate downlink channel conditions for a user terminal on a resource block in a relay network, in accordance with another embodiment of the present invention.
  • the serving node determined by the user terminal is a slave relay node, and the slave relay node is subordinate to the master node base station eNodeB.
  • the steps shown in FIG. 4 are substantially the same as the steps shown in FIG.
  • FIG. 5 is a schematic block diagram of a network device 500 in accordance with one embodiment of the present invention.
  • a network device 500 for use in a relay network for estimating downlink channel conditions for a user terminal on a resource block is provided.
  • the management network device 500 includes a receiver 510, a first device 520, and a second device 530, as shown in FIG.
  • Receiver 510 is configured to receive a serving node to receive power data.
  • the serving node receives power data for indicating information about the power of the reference signal transmitted by a serving node to which the user terminal belongs, which is received by the user terminal.
  • Receiver 510 is also operative to receive a node identification data.
  • the node identification data is used to indicate an identification of at least one node associated with the user terminal.
  • the receiver 510 is further configured to receive a node reference signal to receive power data.
  • the node reference signal received power data is used to indicate information about the power of the reference signal transmitted by the at least one node received by the user terminal.
  • the first device 520 is configured to acquire, by the at least one node, a transmission status of the resource block,
  • the second device 530 is configured to estimate a downlink channel condition of the user terminal on the resource block according to the serving node receiving power data, node identification data, node reference signal received power data, and transmission status information.
  • network device 600 further includes a third device (not shown) for determining resources for downlink communications of the user terminal on the resource block based on the estimated channel conditions Scheduling plan.
  • the resource scheduling scheme includes at least one of the following resource scheduling items: transport block size, modulation scheme, or coding rate.
  • Figure 6 is a schematic block diagram of a user terminal 600 in accordance with one embodiment of the present invention. According to an embodiment of the fifth aspect of the present invention, a user terminal 600 for providing feedback information in a relay network is provided.
  • User terminal 600 includes a first device 610 and a transmitter 620.
  • the first device 610 is configured to determine, according to the received power of the reference signal sent by the multiple nodes, that the at least one node is a node related to the user terminal.
  • Transmitter 620 is configured to send a node identification data.
  • the node identification data is used to indicate the identity of at least one node.
  • Transmitter 620 is also operative to transmit a node reference signal to receive power data.
  • the node reference signal received power data is used to indicate information about the power of the reference signal transmitted by the at least one node received by the user terminal.
  • Transmitter 620 is also operative to transmit a serving node to receive power data.
  • the serving node receives power data for indicating information about the power of the reference signal transmitted by a serving node to which the user terminal belongs, which is received by the user terminal.
  • the user terminal can determine at least one node associated with the user terminal in a variety of ways. For example, a power threshold is preset, and if the power value of a node reference signal received by the user terminal exceeds the power threshold, the user terminal determines the node as one of at least one node related to the user terminal. node.
  • a power ratio threshold is preset, and if the ratio of the received power of the reference signal received by the user terminal to the reference signal power of the serving node received by the user terminal is greater than the power ratio threshold, the user The terminal determines the node as one of at least one node associated with the user terminal.

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Abstract

Dans la solution technique fournie par la présente invention, un équipement de réseau estime la condition de canal de liaison descendante d'un terminal d'utilisateur sur un bloc de ressources dans un réseau de relais. Le terminal d'utilisateur transmet des données de puissance reçue de noeud de service, des données d'identification de noeud et des données de puissance reçue de signal de référence de noeud. Après réception des données ci-dessus transmises par le terminal d'utilisateur, l'équipement de réseau obtient les informations d'état de transmission d'au moins un noeud sur le bloc de ressources, estime ensuite la condition de canal de liaison descendante du terminal d'utilisateur sur le bloc de ressources conformément aux données de puissance reçue de noeud de service, aux données d'identification de noeud, aux données de puissance reçue de signal de référence de noeud et aux informations d'état de transmission. Par ces moyens, même si l'état de transmission d'un noeud sur différents blocs de ressources est différent, l'estimation de la condition de canal de liaison descendante sur différents blocs de ressources peut être relativement précise.
PCT/CN2009/074315 2009-09-29 2009-09-29 Procédé et équipement d'estimation de condition de canal de liaison descendante WO2011038542A1 (fr)

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CN200980159875.3A CN102474868B (zh) 2009-09-29 2009-09-29 用于估计下行链路的信道条件的方法及设备
PCT/CN2009/074315 WO2011038542A1 (fr) 2009-09-29 2009-09-29 Procédé et équipement d'estimation de condition de canal de liaison descendante

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