WO2013000253A1 - Procédé d'échange d'informations dans un système d'émission et de réception multipoint coordonnées et système d'émission et de réception multipoint coordonnées - Google Patents

Procédé d'échange d'informations dans un système d'émission et de réception multipoint coordonnées et système d'émission et de réception multipoint coordonnées Download PDF

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Publication number
WO2013000253A1
WO2013000253A1 PCT/CN2011/084153 CN2011084153W WO2013000253A1 WO 2013000253 A1 WO2013000253 A1 WO 2013000253A1 CN 2011084153 W CN2011084153 W CN 2011084153W WO 2013000253 A1 WO2013000253 A1 WO 2013000253A1
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resource
uplink
base station
message
dmrs
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PCT/CN2011/084153
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English (en)
Chinese (zh)
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王瑜新
夏树强
郝鹏
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中兴通讯股份有限公司
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Publication of WO2013000253A1 publication Critical patent/WO2013000253A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception

Definitions

  • the present invention relates to the field of communications, and in particular, to information interaction in a Coordinated Multi-Point Transmission and Reception (CoMP) system.
  • CoMP Coordinated Multi-Point Transmission and Reception
  • Method and CoMP system In the Long Term Evolution (LTE) system of the 3rd Generation Partnership Project (3GPP), centralized scheduling of base stations is used to control user equipment (User Equipment, referred to as The transmission of the physical uplink shared channel (Physical Uplink Shared Channel, PUSCH for short) of the UE. Uplink Scheduling Information for the PUSCH is sent by the base station to the target UE through a Physical Downlink Control Channel (PDCCH).
  • PDCH Physical Downlink Control Channel
  • the uplink scheduling information includes: resource allocation related to the physical uplink shared channel, a modulation and coding scheme, and a cyclic shift (Cyclic Shift) of a Demodulation Reference Signal (DMRS).
  • the physical uplink shared channel in the LTE system is transmitted using a single antenna port.
  • a system frame contains 10 subframes, each of which contains 2 slots.
  • 1 is a schematic diagram of a cyclic prefix in a slot according to the related art. As shown in FIG. 1, for a normal cyclic prefix (Normal CP), each slot is composed of 6 data symbols and 1 slot.
  • the demodulation reference signal is composed of; for an extended cyclic prefix (Extended CP), each time slot is composed of 5 data symbols and 1 demodulation reference signal.
  • the demodulation reference signal DM RS consists of a sequence in the frequency domain which is a cyclic shift of the reference signal sequence.
  • the reference signal sequence of the demodulation reference signal may implement a sequence-based sequence hopping or a group hopping according to the configuration of the base station. This mode is also called a slot hopping. Turn the SGH way. SP, according to the configuration of the base station, the demodulation reference signal of a user equipment in two time slots in one subframe is different, and varies with the time slot in a system frame according to a certain jump pattern.
  • uplink scheduling The information is carried on the physical downlink control channel, and is transmitted by the base station to the target user equipment in a certain downlink control information format (Downlink Control Information Format, DCI format for short).
  • DCI Format Downlink Control Information Format
  • the downlink control information format is divided into the following types: DCI The format 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, etc., wherein the DCI format 0 includes uplink scheduling information, which is used to indicate scheduling of the physical uplink shared channel PUSCH.
  • the LTE-Advanced system (referred to as LTE-A system for short) is a next-generation evolution system of the LTE system.
  • the physical uplink shared channel can be transmitted by a single antenna port or by multiple antenna ports.
  • 2 is a schematic diagram of a baseband signal processing of a physical uplink shared channel of a LTE-A system using a multi-antenna port according to the related art.
  • the LTE-A system when transmitting multiple antenna ports, supports one based on one. Or spatial multiplexing of two codewords (CW), each codeword corresponding to one transport block (Transport Block, referred to as TB).
  • FIG. 3 is a schematic diagram of precoding of an LTE-A system according to the related art.
  • LTE-A adopts a precoding method based on a codebook (codebook), which is a precoding method.
  • codebook which is a precoding method.
  • Technology is a technique that uses channel status information (CSI) to preprocess signals at the transmitting end to improve the performance of multi-antenna systems.
  • One way for the transmitter to acquire CSI is through feedback from the receiver.
  • the general method is to save the same codebook at the receiving end and the transmitting end.
  • the receiving end selects a suitable precoding matrix in the codebook according to the current channel condition, and feeds back the index value (Precoding Matrix Index, PMI for short) in the set back to the transmitting end, and the transmitting end finds according to the feedback precoding matrix index.
  • Precoding the matrix and precoding the transmitted signal Precoding the matrix and precoding the transmitted signal.
  • DMRS demodulation reference signal
  • Demodulation reference signals for different layer data including demodulation reference signals for multi-layer data of the same user equipment for single-user multiple input multiple output system (SU-MIM0), and multi-user multiple input multiple output system (MU-MIM0)
  • Demodulation reference signals of multi-layer data of a plurality of user equipments are orthogonalized by using different demodulation reference signal cyclic shifts (CS) and/or orthogonal mask codes (OFDMCs for short) Differentiate different layer data of user space reuse or distinguish different users.
  • the orthogonal mask OCC is [+1, +1] and [+1, a 1], and acts on the demodulation reference signals on two slots (Slots) within one subframe.
  • the LTE standard version is Release 8 and Release 9 and the LTE-A standard is Release 10, which is abbreviated as Rel. -8, Rel-9 and Rel-10, LTE-A standards may also include subsequent versions, such as Rel-l l.
  • the base station can indicate the cyclic shift/OCC information of the demodulation reference signal for the scheduled PUSCH through DCI format 0 and DCI format 4, as shown in Table 1. " DMRS ⁇ and ww " mapping table for the cyclic shift region of the uplink related DCI format
  • the base station When the orthogonal reference mask OCC is used to orthogonalize the demodulation reference signal, the base station needs to jointly detect the demodulation reference signals on the two slots in one subframe, thus requiring one user equipment to be two in one subframe.
  • the demodulation reference signal on the time slot must be the same.
  • the SGH method of slot jump in the LTE system cannot be used.
  • the SGH method of subframe jump is proposed in the related art.
  • the coordinated multi-point transmission technology utilizes the coordinated transmission of the transmit antennas of multiple cells to achieve higher capacity and reliable transmission of the wireless link at the cell edge, and can effectively solve the problem of cell edge interference.
  • 4 is a schematic diagram of downlink coordinated multipoint transmission according to the related art. As shown in FIG. 4, downlink CoMP can be classified into two types: Joint Processing/Joint Transmission (JP/JT for short) and cooperative scheduling.
  • CS/CB Coordinated Scheduling/Beamforming
  • JT data is simultaneously transmitted from multiple cells, and the transmission data, scheduling, and channel state information are only exchanged between multiple transmission points in the cooperation set; in CS/CB, only the serving cell sends data to the UE, Scheduling and Beamforming information interact in a CoMP collaboration set.
  • Different cells participating in the transmission or cooperation form a cooperation set. For a certain UE, one cell in the cooperation set is a serving cell, and the remaining cells are coordinated cells.
  • 5 is a schematic diagram of uplink cooperative multi-point transmission according to the related art. As shown in FIG.
  • UE1 sends data to a base station of a serving cell and a coordinated cell, and the base station of the coordinated cell sends the received data to the UE1 through the X2 interface.
  • the base station of the associated serving cell performs combined reception processing.
  • the uplink DMRS of the UE2 and/or the UE3 overlaps with the uplink DMRS of the UE1 in the frequency domain, the uplink DMRS of the UE1 is interfered by the UE2 and the UE3, thereby affecting the channel estimation quality of the UE1 by the receiving end, thereby reducing Uplink CoMP transmission performance.
  • an effective solution has not been proposed yet.
  • a primary object of the present invention is to provide an interaction scheme for messages in a coordinated multipoint transmission system to at least solve the problem of low channel estimation quality of the uplink CoMP users by the receiving end in the related art.
  • a method of interacting information in a CoMP system is provided.
  • the method for interacting information in a CoMP system includes the following steps:
  • the base station sends a message to a base station of a neighboring cell, where the message includes resource occupation information of the uplink DMRS; and the base station that receives the message according to the resource of the uplink DMRS
  • the occupancy information determines a scheduling policy of the own cell and/or a resource used to transmit the uplink DMRS.
  • the above message is a load information message or a message for interacting CoMP information.
  • the resource occupation information of the uplink DMRS is resource occupation information of the uplink CoMP DMRS.
  • the scheduling policy is that the base station that receives the message does not schedule the user at the cell edge on the PRB corresponding to the resource occupation information of the uplink DMRS.
  • the resource used for transmitting the uplink DMRS is a resource that does not overlap with the resource indicated by the resource occupation information of the uplink DMRS, and the non-overlapping resources include at least one of the following: a code domain resource, a time domain resource, and a frequency domain resource;
  • the non-overlapping resource is a code domain resource, which means that the base station receiving the message uses an OCC different from the OCC indicated by the resource occupation information of the uplink DMRS; the non-overlapping resource is the time domain resource refers to the base station selection and uplink of the received message.
  • the resource-occupied information of the DMRS is different from the time-domain resource of the time-domain resource; the non-overlapping resource is the frequency-domain resource, and the base station that receives the message selects a frequency-domain resource that is different from the frequency-domain resource corresponding to the resource occupation information of the uplink DMRS.
  • the method further includes: setting, by using the message of the X2 interface, an OCC occupation indication information element of the uplink DMRS to indicate resource occupation information of the uplink DMRS.
  • setting the OCC occupation indication information element of the uplink DMRS by using the message of the X2 interface to indicate the resource occupation information of the uplink DMRS includes: using bit characters to represent OCC occupation information on each PRB, where each bit corresponds to one PRB, On each bit, 0 and 1 respectively indicate that different OCCs are used; or, enumerated characters are used to indicate OCC occupancy information on each PRB and/or whether there is uplink CoMP DMRS information, where different enumeration values are used. Different OCCs and/or indicate whether there is an uplink CoMP DMRS.
  • the sending, by the base station, the message to the base station of the neighboring cell includes: sending, by the base station of each cell in the cooperation set, a message to the base station of the coordinated cell; or transmitting, by the base station of the serving cell, the base station of the other cell in the coordinated set Message.
  • a CoMP system is also provided.
  • the CoMP system includes a plurality of base stations, wherein each of the plurality of base stations includes: a sending module, configured to send a message to a base station of a neighboring cell, wherein the message includes resource occupancy information of the uplink DMRS And a receiving module, configured to receive a message from a base station of the neighboring cell; and a determining module, configured to determine a scheduling policy of the current cell and/or a resource used for sending the uplink DMRS according to the resource occupation information of the uplink DMRS.
  • each of the plurality of base stations further includes: a setting module, configured to set an OCC occupation indication information element of the uplink DMRS by using a message of the X2 interface to indicate resource occupation information of the uplink DMRS.
  • the setting module is further configured to use bit characters to represent OCC occupation information on each PRB, where each bit corresponds to one PRB, and each bit represents 0 and 1 respectively to use different OCC; or, The enumerated characters indicate OCC occupancy information on each PRB and/or whether there is uplink CoMP DMRS information, where different enumeration values use different OCCs and/or indicate whether there is an uplink CoMP DMRS.
  • the base station sends a message including the resource occupation information of the uplink DMRS to the base station of the neighboring cell, and the base station that receives the message determines the scheduling policy of the current cell according to the resource occupation information of the uplink DMRS and/or is used to send the uplink.
  • the method of DMRS resources solves the problem that the channel estimation quality of the uplink CoMP user is low at the receiving end in the related art, reduces the interference of the coordinated cell, and improves the system performance.
  • FIG. 1 is a schematic diagram of a cyclic prefix in one slot according to the related art
  • FIG. 2 is a baseband signal processing of a transmitter of a physical uplink shared channel transmitted by a multi-antenna port according to the related art
  • LTE-A system 3 is a schematic diagram of precoding of an LTE-A system according to the related art
  • FIG. 4 is a schematic diagram of downlink coordinated multipoint transmission according to the related art
  • FIG. 5 is a schematic diagram of uplink coordinated multipoint transmission according to the related art
  • 6 is a flowchart of a method for interacting information in a CoMP system according to an embodiment of the present invention
  • FIG. 7 is a structural block diagram of a CoMP system according to an embodiment of the present invention
  • FIG. 8 is a structural block diagram of a CoMP system according to a preferred embodiment of the present invention.
  • FIG. 6 is a flowchart of a method for interacting information in a CoMP system according to an embodiment of the present invention.
  • the method includes the following steps: Step S602: A base station sends a message to a base station of a neighboring cell, where the message includes an uplink. And demodulating the resource occupation information of the reference signal DMRS.
  • Step S604 The base station that receives the message determines the scheduling policy of the current cell and/or the resource used for sending the uplink DMRS according to the resource occupation information of the uplink DMRS.
  • the base station sends a message including the resource occupation information of the uplink DMRS to the base station of the neighboring cell, and the base station that receives the message determines the scheduling policy of the current cell according to the resource occupation information of the uplink DMRS and/or is used to send the uplink.
  • the method of DMRS resources solves the problem that the channel estimation quality of the uplink CoMP user is low at the receiving end in the related art, reduces the interference of the coordinated cell, and improves the system performance.
  • the message is a load information message or a message for interacting CoMP information. The method is simple to implement and has high operability.
  • the resource occupation information of the uplink DMRS is resource occupation information of the uplink CoMP DMRS.
  • the scheduling policy is that the base station that receives the message does not schedule the user at the cell edge on a physical resource block (Physical Resource Block, PRB for short) corresponding to the resource occupation information of the uplink DMRS.
  • PRB Physical Resource Block
  • the resource used for transmitting the uplink DMRS is a resource that does not overlap with the resource indicated by the resource occupation information of the uplink DMRS
  • the non-overlapping resources include at least one of the following: a code domain resource, a time domain resource, The frequency domain resource; wherein the non-overlapping resource is a code domain resource, the base station receiving the message uses an OCC different from the orthogonal mask OCC indicated by the resource occupation information of the uplink DMRS; the non-overlapping resource is a time domain resource The base station that receives the message selects the time domain resource that is different from the time domain resource corresponding to the resource occupation information of the uplink DMRS; the non-overlapping resource is the frequency domain resource, and the base station that receives the message selects the resource occupation information corresponding to the uplink DMRS.
  • the OCC occupation indication information element of the uplink DMRS is set by the message of the X2 interface to indicate the resource occupation information of the uplink DMRS.
  • the method is simple and practical, and has high operability.
  • setting the OCC occupation indication information element of the uplink DMRS by using the message of the X2 interface to indicate the resource occupation information of the uplink DMRS includes: using bit characters to indicate OCC occupation information on each PRB, where each bit corresponds to one PRB, On each bit, 0 and 1 respectively indicate the use of different OCCs; or, using enumerated characters to indicate OCC occupancy information on each PRB and/or whether there is uplink CoMP DMRS information, where different enumeration values use different OCCs and/or indicate whether there is uplink CoMP DMRS o
  • This method can improve the accuracy and efficiency of the system.
  • step S602 the base station of each cell in the cooperation set sends the message to the base station of the coordinated cell thereof; or the base station of the serving cell sends the message of the local cell to the base station of other cells in the cooperation set.
  • This method can increase the flexibility of the system.
  • a CoMP system is also provided.
  • FIG. 7 is a structural block diagram of a CoMP system according to an embodiment of the present invention. As shown in FIG.
  • the CoMP system includes a plurality of base stations 72, wherein each of the plurality of base stations 72 includes: a sending module 722, configured to The base station of the neighboring cell sends a message, where the message includes the resource occupation information of the uplink DMRS; the receiving module 724 is configured to receive the message from the base station of the neighboring cell; the determining module 726 is coupled to the receiving module 724, and is configured.
  • the scheduling policy of the current cell and/or the resource used for sending the uplink DMRS are determined according to the resource occupation information of the uplink DMRS.
  • the sending module 722 sends a message including the resource occupation information of the uplink DMRS to the base station of the neighboring cell, and the determining module 726 of the base station that receives the message determines the scheduling policy of the current cell according to the resource occupation information of the uplink DMRS.
  • the method for transmitting the resources of the uplink DMRS solves the problem that the channel estimation quality of the uplink CoMP user is low in the related art, reduces the interference of the coordinated cell, and improves the system performance.
  • the resource occupation information of the uplink DMRS may be resource occupation information of the uplink CoMP DMRS.
  • FIG. 8 is a structural block diagram of a CoMP system according to a preferred embodiment of the present invention. As shown in FIG.
  • each of the plurality of base stations 72 further includes: a setting module 728 coupled to the sending module 722, configured to pass through the X2 interface.
  • the message sets the OCC occupation indication information element of the uplink DMRS to indicate the resource occupation information of the uplink DMRS.
  • the setting module 728 is further configured to use bit characters to represent OCC occupation information on each PRB, where each bit corresponds to one PRB, and each bit represents 0 and 1 respectively to use different OCCs; or
  • the enumerated characters are used to indicate OCC occupation information on each PRB and/or whether there is uplink CoMP DMRS information, wherein different enumeration values use different OCCs and/or indicate whether there is uplink CoMP DMRS.
  • Embodiment 1 provides an interference coordination method for inter-cell uplink demodulation reference signals in a CoMP system, which reduces interference from a coordinated cell by interworking the resource occupancy information of the uplink CoMP DMRS, and improves the receiving end (base station) for the uplink DMRS.
  • the channel estimation quality improves the transmission performance of the uplink CoMP.
  • the interference coordination method of the inter-cell uplink demodulation reference signal in the CoMP system of this embodiment may be: first, the base station sends a message to the base station of the neighboring cell (for example, the message may be a LOAD INFORMATION message or may be used) The message that the CoMP-related information is exchanged, the message includes the resource occupation information of the uplink CoMP DMRS. Second, the base station that receives the message determines the scheduling policy of the current cell according to the received resource occupation information of the uplink CoMP DMRS (ie, When the base station receives the uplink CoMP resource occupation information, it tries to avoid the user who schedules the cell edge on the corresponding PRB and/or the resource used to send the uplink DMRS.
  • the interference coordination method may include the following steps: Step 1: In the CoMP system, the base station of each cell in the cooperation set sends the resource occupation information of the uplink CoMP DMRS to the base station of the coordinated cell.
  • each cell in the cooperation set indicates the resource occupation information of the uplink CoMP DMRS by using an information element (IE) item on the X2 interface to uplink the OCRS OCC occupation indication.
  • the OCC occupation indication of the uplink DMRS of the information element (IE) item is an IE item set on the LOAD INFORMATION message, and indicates OCC occupation information on each PRB.
  • the IE format used by the IE item may be as follows: Method 1: Each bit in the bit character corresponds to one PRB, BP, the first bit corresponds to PRB0, the second bit corresponds to PRB1, and so on. . Each bit in the bit character has a value of "1", indicating the use of OCC [1 _ 1], a value of "0” indicates that OCC [1 1] is used, or a value of "0” indicates that OCC [1 - 1] is used. , the value "1" means using OCC [1 1] , as shown in the following table
  • the OCC indication (bit string) of each of the upstream DMRS M-bit characters Bitmap represents 1 PRB
  • Method 2 Use enumerated characters to indicate OCC occupancy information and/or uplink on each PRB.
  • CoMP DMRS and use OCC [1 l]; if . If the value is 10, the uplink CoMP DMRS is used on the i-th PRB, and the OCC [1 _ 1] is used.
  • the IE format that can be added to the X2 interface is as follows: Table 3: The OCC physical resource block of the uplink CoMP DMRS Occupation instruction 2
  • Step 2 Each base station determines, according to the received resource occupation information, a resource that the local cell sends an uplink DMRS.
  • the base station selects a resource that does not overlap with the resource indicated by the resource occupation information of the CoMP DMRS, and is a resource used for sending the uplink DMRS.
  • the non-overlapping of the resources includes: the code domain resources do not overlap, and/or the time domain resources do not overlap, and/or the frequency domain resources do not overlap.
  • the non-overlapping of the code domain resources of the uplink DMRS includes: using an OCC different from that indicated by the uplink CoMP DMRS resource occupation information.
  • the time domain resources of the uplink DMRS do not overlap include: selecting a time domain resource corresponding to the uplink CoMP DMRS resource occupation information; or not scheduling the time domain resource corresponding to the uplink CoMP DMRS resource occupation information user.
  • not overlapping the frequency domain resources of the uplink DMRS includes: selecting a frequency domain resource corresponding to the uplink CoMP DMRS resource occupation information. In the implementation process, the following may also be used to select the resource for sending the uplink DMRS in the local cell:
  • the serving cell also sends the resource occupation information of the uplink DMRS of the cell to other cells in the collaboration set through the X2 interface.
  • the serving cell also sends the resource occupation information of the uplink DMRS of the cell to other cells in the collaboration set through the X2 interface.
  • the interference coordination method for the inter-cell uplink demodulation reference signal in the CoMP system can indicate the parameters of the demodulation reference signal to meet the requirements of the uplink multi-antenna port transmission, and solve the related technology.
  • the indication method in the method cannot meet the requirements of the uplink multi-antenna port transmission, reduces the interference of the coordinated cell, and improves the system performance.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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Abstract

L'invention concerne un système d'émission et de réception multipoint coordonnées (CoMP) et son procédé d'échange d'informations. Le procédé comprend les étapes suivantes : une station de base envoie un message à une station de base d'une cellule voisine, le message comprenant des informations d'occupation de ressource d'un DMRS de liaison montante ; et la station de base recevant le message détermine, conformément aux informations d'occupation de ressource du DMRS de liaison montante, une politique de programmation et/ou une ressource pour une transmission du DMRS de liaison montante de la cellule. La présente invention résout le problème de l'état antérieur de l'état de l'art selon lequel la qualité d'estimation de canal d'une extrémité de réception pour un utilisateur CoMP de liaison montante est faible, réduit l'interférence de cellules de coordination, et améliore la performance du système.
PCT/CN2011/084153 2011-06-30 2011-12-16 Procédé d'échange d'informations dans un système d'émission et de réception multipoint coordonnées et système d'émission et de réception multipoint coordonnées WO2013000253A1 (fr)

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CN201110182414.7A CN102395163B (zh) 2011-06-30 2011-06-30 协作多点传输系统中信息的交互方法及协作多点传输系统

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