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WO2015110064A1 - Procédé et dispositif de communication coordonnée - Google Patents

Procédé et dispositif de communication coordonnée Download PDF

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Publication number
WO2015110064A1
WO2015110064A1 PCT/CN2015/071425 CN2015071425W WO2015110064A1 WO 2015110064 A1 WO2015110064 A1 WO 2015110064A1 CN 2015071425 W CN2015071425 W CN 2015071425W WO 2015110064 A1 WO2015110064 A1 WO 2015110064A1
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WO
WIPO (PCT)
Prior art keywords
base station
terminal
link parameter
link
serving
Prior art date
Application number
PCT/CN2015/071425
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English (en)
Chinese (zh)
Inventor
李强
杨晓东
王学龙
高永强
高毓恺
Original Assignee
华为技术有限公司
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Publication of WO2015110064A1 publication Critical patent/WO2015110064A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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
    • 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
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present invention relates to the field of computer technologies, and in particular, to a cooperative communication method and device.
  • the coverage of the network is divided into cells (Cells), and each cell is usually provided by a BS (Base Station). service. This base station is called the serving base station of the cell.
  • BS provides downlink and uplink receiving services for UEs (User Equipments) in its cell.
  • each base station maintains a relatively independent working mode. That is to say, each base station is only responsible for uplink and downlink scheduling for the UEs in the local cell, and provides downlink transmission and uplink reception services. For how UEs in other cells work, a base station generally does not provide assistance or interfere.
  • UEs at the cell edge in each cell tend to have poor performance.
  • the cell edge UE is far away from its serving base station, and the transmission performance of the cell is poor.
  • the cell The edge UE is relatively close to the neighboring cell, and the interference from the neighboring cell is more serious.
  • a new technology called “CoMP (Coordinated Multiple Point)" is gradually introduced in the new wireless network.
  • CoMP Coordinatd Multiple Point
  • a certain degree of cooperation can be performed between base stations, especially between adjacent base stations, thereby improving the quality of transmission. That is to say, a base station not only provides services for users of the cell, but also provides services for UEs of neighboring cells, or creates better communication conditions (for example, reduces interference) for services of neighbor cell users.
  • CoMP technology often requires a new network architecture.
  • adjacent base stations can be interconnected by a wired network.
  • Such interconnections are generally referred to as backhauls.
  • inter-base stations are interconnected by optical fibers.
  • backhaul is generally considered to provide high-speed, low-latency information interaction. Due to the existence of such backhaul, neighboring base stations can perform timely information interaction and cooperate for intra-cell use. Provide services.
  • the general assumption is that the base stations are interconnected by a high-capacity, low-latency backhaul, for example, direct connection through optical fibers. But in fact, it is often difficult to make fiber-optic direct connections between base stations. For example, in towns and villages, the cost of laying fiber in many places can be very high.
  • the base stations can be interconnected by a weaker backhaul (Weak backhaul).
  • Weak backhaul a prominent problem with Weak backhaul is that the delay between each other is large, often around 20ms.
  • DPS Dynamic Point Selection
  • the primary serving first base station receives the CSI (Channel State Information) reported by the UE, and the CSI information reflects the first base station and the second base station.
  • the indication is sent to the second base station by backhaul. Instructing the second base station to provide a transmission service to the UE, but since the indication information may take 20 ms to reach the second base station, the second base station can perform downlink data transmission after 20 ms, and at this time, since 20 ms has passed, The transmission conditions of the two base stations may not be as good as the first base station.
  • a cooperative communication method and device are provided, which can improve the overall performance of cooperative communication between base stations under a large delay backhaul scenario.
  • a collaborative communication method including:
  • the serving base station Determining, according to the cooperative communication manner, a link parameter that is required to be used by the serving base station serving the terminal, and the first base station, by using the part of the air interface resource, the cooperative communication mode and the link parameter The number is transmitted to the serving base station, so that the serving base station provides services for the terminal according to the link parameters, wherein the serving base station comprises: the first base station and/or the second base station.
  • the determining, by the cooperative communication manner, a link parameter that is required to be used by a serving base station that provides a service for the terminal includes:
  • the first base station determines that the first base station and the second base station are the serving base station;
  • the first base station receives the first link parameter and the second link parameter sent by the terminal, and determines, according to the first link parameter and the second link parameter, that the second base station needs according to the joint transmission mode Link parameters used;
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal
  • the second link parameter is if the first base station is The link parameters determined by the terminal when the second base station jointly provides services for the terminal.
  • the determining, by the cooperative communication manner, the link parameters that are required to be used by the serving base station that provides the service for the terminal including:
  • the first base station determines, as the serving base station, a base station in which a channel condition meets a threshold;
  • the first base station receives the first link parameter and the third link parameter sent by the terminal, and determines, according to the first link parameter and the third link parameter, a link parameter that the serving base station needs to adopt;
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal
  • the third link parameter is if the second base station is separate
  • the determining, by the cooperative communication manner, a link parameter that is required to be used by a serving base station that provides a service for the terminal including:
  • the first base station determines that it is the serving base station;
  • the first base station receives a fourth link parameter and a fifth link parameter sent by the terminal;
  • the fourth link parameter is a link parameter determined by the terminal if the first base station provides service for the terminal separately, and the second base station does not cause interference to the terminal;
  • the fifth link parameter is a link parameter determined by the terminal if the second base station provides service for the terminal separately, and the second base station causes interference to the terminal.
  • the air interface resource includes: a wireless link between the first base station and the second base station And a part of the OFDM symbol in the subframe.
  • a collaborative communication method including:
  • the second base station When the second base station serves as the serving base station serving the terminal, the second base station receives the part of the air interface resource for performing information interaction with the first base station with the first base station, and receives the The cooperative communication mode and link parameters required by the serving base station;
  • the second base station provides a service for the terminal according to the link parameter.
  • the air interface resource includes: a part of a time-frequency resource that is transmitted by using the radio link between the second base station and the first base station, the time-frequency The resource includes: a subframe or a partial OFDM symbol in the subframe.
  • a first base station including:
  • An air interface resource determining module configured to determine a part of the air interface resource used for information interaction with the second base station in the air interface resource between the first base station and the second base station;
  • a cooperative communication mode determining module configured to determine that the first base station and the second base station cooperate with each other Way of lettering
  • a communication mode transmission module configured to determine, according to the cooperative communication manner, a link parameter that is required by a serving base station serving the terminal, and the cooperative communication mode and the link by using the part of the air interface resource The parameter is transmitted to the serving base station, so that the serving base station provides services for the terminal according to the link parameter, wherein the serving base station comprises: the first base station and/or the second base station.
  • the communications mode transmission module includes:
  • a first serving base station determining module configured to determine, when the cooperative communication mode is a joint transmission mode, the second base station is the serving base station;
  • a first link parameter receiving module configured to receive a first link parameter and a second link parameter sent by the terminal
  • a first serving base station link parameter determining module configured to determine, according to the first link parameter and the second link parameter, a link parameter that is required by the second base station according to the joint transmission mode
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal
  • the second link parameter is if the first base station is The link parameters determined by the terminal when the second base station jointly provides services for the terminal.
  • the communication mode transmission module includes:
  • a second serving base station determining module configured to determine, as the serving base station, a base station in which a channel condition meets a threshold when the cooperative communication mode is a dynamic transmission point selection transmission mode;
  • a second link parameter receiving module configured to receive a first link parameter and a third link parameter sent by the terminal
  • a second serving base station link parameter determining module configured to determine, according to the first link parameter and the third link parameter, a link parameter that the serving base station needs to adopt;
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal
  • the third link parameter is if the second base station is separate
  • the communication mode transmission module includes:
  • a third serving base station determining module configured to determine that the serving base station is the serving base station when the cooperative communication mode is a joint link adaptive transmission mode
  • a third link parameter receiving module configured to receive a fourth link parameter and a fifth link parameter sent by the terminal
  • An interference determining module configured to receive scheduling parameters sent by the second base station by using the air interface resource, to determine interference generated by the second base station to the first base station;
  • a third serving base station link parameter determining module configured to determine, according to the fourth link parameter and the fifth link parameter, and the interference generated by the second base station to the first base station, that the first base station is configured according to Link parameters required for the joint link adaptive transmission mode;
  • the fourth link parameter is a link parameter determined by the terminal if the first base station provides service for the terminal separately, and the second base station does not cause interference to the terminal;
  • the fifth link parameter is a link parameter determined by the terminal if the second base station provides service for the terminal separately, and the second base station causes interference to the terminal.
  • the air interface resource includes: a wireless link between the first base station and the second base station And a part of the OFDM symbol in the subframe.
  • a second base station including:
  • a communication mode receiving module configured to: when the second base station serves as a serving base station serving the terminal, receive the first base station by using a part of the air interface resource with the first base station for performing information interaction with the first base station The cooperative communication manner sent and the link parameters required by the serving base station;
  • the service module is configured to provide a service for the terminal according to the link parameter.
  • the air interface resource includes: a part of a time-frequency resource that is transmitted by using the radio link between the second base station and the first base station, the time-frequency The resource includes: a subframe or a partial OFDM symbol in the subframe.
  • the information about the cooperation mode between the first base station and the second base station and the link parameters used by the serving base station are performed by using the air interface resource for performing wireless transmission between the base station and the terminal, because the air interface resource is used for transmission.
  • the delay in information transmission is very low, so that information interaction can be quickly performed between the first base station and the second base station, thereby greatly improving the overall performance of cooperative communication between the base stations.
  • FIG. 1 is a schematic diagram of a network architecture for implementing CoMP in the prior art
  • FIG. 2 is a schematic flowchart diagram of an embodiment of a cooperative communication method according to the present invention.
  • FIG. 4 is a schematic flowchart diagram of another embodiment of a cooperative communication method according to the present invention.
  • FIG. 5 is a schematic diagram of a specific cooperative communication process in a JT mode according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a specific cooperative communication process in a DPS mode according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a specific cooperative communication process in a CLA mode according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a first base station according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a second base station according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a first base station implemented by a computer system according to the present invention.
  • FIG. 11 is a schematic structural diagram of a second base station implemented by a computer system according to the present invention.
  • FIG. 2 is a flowchart of an embodiment of a method for cooperative communication according to the present invention.
  • the process flow may specifically include:
  • Step 201 Determine a part of the air interface resource used for information interaction with the second base station in the air interface resource between the first base station and the second base station.
  • the air interface resource is used by the base station to provide wireless transmission to the UE, and the base stations exchange information through the wired backhaul.
  • the base stations can negotiate through backhaul, and a part of the air interface resources are used to perform information exchange between the base stations.
  • the first base station can directly use some air interface resources to transmit control information to the second base station. Since the transmission delay of the air interface is very low, only 1-4 ms, so that information exchange can be quickly performed between the base stations.
  • the first base station may determine a part of the air interface resource used for information interaction between the first base station and the second base station, and may also determine, by the network controller, the part of the air interface resource.
  • Step 202 Determine a manner in which the first base station and the second base station perform cooperative communication with the terminal.
  • the specific manner of cooperative communication may include: Joint Transmission (JT), Dynamic Point Selection (DPS), and joint link adaptive transmission ( Cooperative Link Adaptation (CLA).
  • JT Joint Transmission
  • DPS Dynamic Point Selection
  • CLA Cooperative Link Adaptation
  • the first base station may determine the manner in which the second base station performs cooperative communication with the terminal
  • the network controller may determine the manner in which the first base station and the second base station perform cooperative communication with the terminal.
  • Step 203 Determine, according to the cooperative communication manner, a link parameter that is required by the serving base station that provides the service for the terminal, where the first base station passes the part of the air interface resource to And the link mode is transmitted to the serving base station, so that the serving base station provides the terminal according to the link parameter, where the serving base station comprises: the first base station and/or Second base station.
  • the serving base station that finally provides the service for the terminal may be determined. Further, according to the cooperative communication method, a link parameter that is required to be used by the serving base station serving the terminal is determined. Transmitting, by the first base station, the cooperative communication mode and the link parameter to the serving base station by using the partial air interface resource, so that the serving base station provides services for the terminal according to the link parameter.
  • the serving base station may include: the first base station and/or the second base station, corresponding to different cooperative communication modes.
  • the information about the cooperation mode between the first base station and the second base station and the link parameters used by the serving base station are performed by using the air interface resource for performing wireless transmission between the base station and the terminal, because the air interface resource is used for transmission.
  • the delay in information transmission is very low, so that the first base station can quickly transmit the cooperative communication mode and link parameters to the second base station serving as the serving base station through the air interface resource. Since the first base station and the second base station can quickly perform information interaction through air interface resources, the overall performance of cooperative communication between the base stations can be greatly improved.
  • the air interface resource in the embodiment of the present invention may include: a partial subframe transmitted by the first base station and the second base station by using a wireless link, or a partial OFDM in the subframe. symbol.
  • time-frequency resources are divided into sub-frames, and each sub-frame is further divided into multiple OFDM (Orthogonal Frequency Division Multiplexing) symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • these resources are all It is used to provide transmission services for the UE.
  • the base stations can negotiate through backhaul, and use part of the subframes or part of the OFDM symbols as information interaction between the base stations. Specifically, it is necessary to determine which of the above-mentioned air interface resources are used to implement information transmission from the first base station to the second base station, and which are used to implement information transmission from the second base station to the first base station. For example, as shown in FIG.
  • the first base station transmits information to the second base station by using one subframe, and the second base station also transmits information to the first base station by using one subframe;
  • FIG. 3(b) shows The first base station transmits information to the second base station by using two OFDM symbols in one subframe, and the second base station Information is also transmitted to the first base station using two OFDM symbols in one subframe. If an time-frequency resource is used to implement information transmission from the first base station to the second base station, on the part of the resources, the second base station does not send data, but receives information sent by the first base station. vice versa.
  • the cooperative communication method is different, and the implementation of the link parameter that is required to be used by the serving base station that provides the service for the terminal is different according to the cooperative communication manner, and may specifically include the following forms:
  • the first base station determines that the first base station and the second base station are the serving base station;
  • the first base station receives the first link parameter and the second link parameter sent by the terminal, and determines, according to the first link parameter and the second link parameter, that the second base station needs according to the joint transmission mode Link parameters used;
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal
  • the second link parameter is if the first base station is The link parameters determined by the terminal when the second base station jointly provides services for the terminal.
  • the first base station determines, as the serving base station, a base station in which a channel condition meets a threshold;
  • the first base station receives the first link parameter and the third link parameter sent by the terminal, and determines, according to the first link parameter and the third link parameter, a link parameter that the serving base station needs to adopt;
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal, and the third link parameter is if the second base station is separate
  • the link parameter determined by the terminal when the terminal is served; the serving base station may be the first base station or the second base station.
  • the first base station determines that it is the serving base station
  • the first base station receives a fourth link parameter and a fifth link parameter sent by the terminal;
  • the fourth link parameter is a link parameter determined by the terminal if the first base station provides service for the terminal separately, and the second base station does not cause interference to the terminal;
  • the fifth link parameter is a link parameter determined by the terminal if the second base station provides service for the terminal separately, and the second base station causes interference to the terminal.
  • the embodiment of the invention also provides a cooperative communication method. This embodiment is based on the second base station side. As shown in FIG. 4, the specific communication process includes:
  • Step 401 When the second base station is serving as a serving base station serving the terminal, the second base station receives the first air resource by using a part of the air interface resource with the first base station for performing information interaction with the first base station.
  • the second base station serving as the serving base station negotiates with the first base station through backhaul, and a part of the air interface resources is used to perform information exchange between the base stations. And receiving, by the air interface resource, the cooperative communication manner sent by the first base station and link parameters required by the serving base station.
  • Step 402 The second base station provides a service for the terminal according to the link parameter.
  • the cooperation between the first base station and the second base station and the link parameters used by the serving base station are performed by using the air interface resource for wireless transmission between the base station and the terminal, and the information is used by using the air interface resource.
  • the time delay of the transmission is very low.
  • the second base station serves as the serving base station serving the terminal
  • the second base station can quickly obtain the cooperative communication mode determined by the first base station and the required use of the serving base station by using the air interface resource.
  • Link parameters Since the first base station and the second base station can quickly perform information interaction through air interface resources, the overall performance of cooperative communication between the base stations can be greatly improved.
  • the air interface resource may specifically include: the second base station and the first A partial subframe transmitted by a base station over a wireless link or a partial OFDM symbol in the subframe.
  • the following is an example of determining, by using the first base station, that the second base station performs cooperative communication with the terminal, and by using the specific implementation manner, the first base station and/or the second base station cooperatively communicate with the terminal.
  • the implementation process is an example of determining, by using the first base station, that the second base station performs cooperative communication with the terminal, and by using the specific implementation manner, the first base station and/or the second base station cooperatively communicate with the terminal.
  • Figure 5 shows the specific collaborative communication process in JT mode, including:
  • Step 501 The UE measures a SINR (Signal to Interference plus Noise Ratio) level that can be achieved when the first base station separately transmits the signal, and determines, according to the measured SINR level, that the first base station transmits the signal separately.
  • SINR Signal to Interference plus Noise Ratio
  • the appropriate link parameters, the link parameters may include: RI (Rank Indication), PMI (Precoding Matrix Indication), and CQI (Channel Quality Indication).
  • the appropriate link parameters are determined by the SINR level. This is because the link conditions are mainly measured by the level of SINR. SINR is the ratio of signal energy to interference noise energy. The higher the SINR, the better the signal quality and the higher the rate of data transmission.
  • Step 502 The UE measures the SINR level that can be achieved when the first base station and the second base station jointly transmit the SINR level, and determines the appropriate link parameters when the first base station and the second base station jointly transmit the SINR level according to the measured SINR level.
  • the link parameters may include parameters such as RI, PMI, and CQI.
  • Step 503 The UE reports the determined two sets of link parameters to the first base station.
  • Step 504 The first base station informs the second base station to use the joint transmission mode for the UE and the link parameters that the second base station needs to adopt by using the air interface resource with the second base station.
  • the specific link parameters may include: PRB used in transmission; RI, PMI, CQI; HARQ process (Hybrid Acknowledge Request Process); redundancy version and power control parameters of the uplink control channel.
  • PRB used in transmission
  • RI RI
  • PMI CQI
  • HARQ process Hybrid Acknowledge Request Process
  • redundancy version and power control parameters of the uplink control channel.
  • the receiver needs to notify the sender to resend the data through a feedback, and the sender will The data is resent based on the feedback from the recipient.
  • the HARQ process parameter which packet is targeted Retransmission.
  • Step 505 The second base station receives the link parameters transmitted by the first base station by using the air interface resource with the first base station, and performs joint transmission with the first base station according to the link parameters.
  • the UE can obtain higher SINR and transmission quality through cooperation between the first base station and the second base station.
  • Figure 6 shows the specific collaborative communication process in DPS mode, including:
  • Step 601 The UE measures the SINR level that can be achieved when the first base station separately transmits the SINR level, and determines the appropriate link parameter for the first base station to transmit separately according to the measured SINR level.
  • the link parameters may include: RI, Parameters such as PMI and CQI.
  • Step 602 The UE measures the SINR level that can be achieved when the second base station separately transmits the SINR level, and determines the appropriate link parameter for the second base station to transmit separately according to the measured SINR level.
  • the link parameters may include: RI, PMI and CQI.
  • Step 603 The UE reports the determined two sets of link parameters to the first base station.
  • Step 604 The first base station determines that the serving base station is a base station in which the channel conditions in the first base station and the second base station meet the threshold.
  • the base station with better channel conditions in the first base station and the second base station is determined as the serving base station.
  • the channel condition threshold may be preset, and the first base station learns, according to the two sets of link parameters, the conditions of the first base station and the second base station respectively and the actual channel of the terminal, and determines the channel condition that the actual channel condition meets the threshold is better. Base station.
  • Step 605 When determining that the second base station is the serving base station, the first base station informs the second base station to use the DPS transmission mode for the UE and the link required by the second base station by using the air interface resource with the second base station. parameter.
  • the specific link parameters may include: PRB used in transmission; RI, PMI, CQI; HARQ process; redundancy version and power control parameters of the uplink control channel.
  • Step 606 The second base station receives the link parameters transmitted by the first base station by using the air interface resource with the first base station, and separately transmits the UE according to the parameters.
  • the network side can select a second base station with better channel conditions and lower load to provide services for the UE, thereby improving network performance.
  • the UE is served by the first base station, and the communication between the first base station and the UE is interfered by the signal transmission of the second base station.
  • Figure 7 shows the specific collaborative communication process in CLA mode, including:
  • Step 701 When the UE measures the first base station to transmit separately, and the second base station does not cause interference to the UE (for example, when the second base station does not perform signal transmission), the SINR level that can be achieved is obtained according to the measurement.
  • the SINR level determines the appropriate link parameters, and the link parameters may include parameters such as RI, PMI, and CQI.
  • the UE needs to measure the channel coefficient of the first base station.
  • the measurement channel coefficient is mainly obtained by performing channel estimation by using a reference signal sent by the first base station, and the reference signal may include: a cell common reference signal (CRS) and a CSI-RS (Channel State). Information Reference Signal, channel quality reference signal).
  • the UE also needs to measure the interference noise level it receives. The measurement of the interference noise is performed on the IMR (Interference Measurement Resource). The UE can calculate the SINR level based on the channel estimation and the estimation result of the interference noise.
  • Step 702 When the UE measures the first base station to transmit separately, and the second base station causes interference to the UE (for example, when the second base station simultaneously performs signal transmission), the SINR level that can be achieved is obtained according to the measured SINR. Level, determine the appropriate link parameters, link parameters can include: RI, PMI and CQI parameters.
  • Step 703 The UE reports the determined two sets of link parameters to the first base station.
  • Step 704 The second base station sends its own scheduling parameter to the first base station by using an air interface resource with the first base station.
  • the second base station notifies the first base station of which PRBs (Physical Resource Blocks) to be scheduled by using the air interface resource with the first base station, and the second base station adopts on each PRB. Transmit power and precoding method used.
  • PRBs Physical Resource Blocks
  • Step 705 The first base station receives the scheduling parameter sent by the second base station by using the air interface resource with the second base station, and determines the interference generated by the second base station.
  • the first base station receives the scheduling parameter sent by the second base station by using the air interface resource with the second base station, and can learn which PRBs the user is interfered with by the other party. In this way, the first base station can determine the interference formed by the second base station to itself.
  • Step 706 The first base station determines a link parameter suitable for communicating with the UE.
  • the interaction between the first base station and the second base station enables the first base station to more accurately determine the interference caused by the second base station, thereby accurately selecting the appropriate link parameter, the chain.
  • the path parameters may include: RI, PMI, and CQI, so that the accuracy of link adaptation is improved.
  • the present invention further provides a first base station and a second base station that implement cooperative communication.
  • an embodiment of a first base station provided by the present disclosure may specifically include:
  • the air interface resource determining module 801 is configured to determine a part of the air interface resource used for information interaction with the second base station in the air interface resource between the first base station and the second base station;
  • the cooperative communication mode determining module 802 is configured to determine a manner in which the first base station and the second base station perform cooperative communication with the terminal;
  • a communication mode transmission module 803 configured to determine, according to the cooperative communication manner, a link parameter that is required by a serving base station that provides a service for the terminal, and the cooperative communication mode and the chain by using the part of the air interface resource
  • the path parameters are transmitted to the serving base station, so that the serving base station provides services for the terminal according to the link parameters, wherein the serving base station comprises: the first base station and/or the second base station.
  • the air interface resource determining module 801 uses the backhaul to negotiate between the first base station and the second base station, and uses a part of the air interface resources to perform information exchange between the base stations.
  • the first base station determines a specific manner of cooperative communication with the second base station to the terminal.
  • specific ways of collaborative communication may include: JT, DPS, and CLA.
  • the first base station may determine a serving base station that ultimately provides the terminal with a service. Further, according to the cooperative communication method, a link parameter that is required to be used by the serving base station serving the terminal is determined.
  • the communication mode transmission module 803, the first base station transmits the cooperative communication mode and the link parameter to the serving base station by using the part of the air interface resource, so that the serving base station performs the link parameter according to the link parameter.
  • Said terminal provides services.
  • the serving base station may include: the first base station and/or the second base station, corresponding to different cooperative communication modes.
  • the information about the cooperation mode between the first base station and the second base station and the link parameters used by the serving base station are performed by using the air interface resource for performing wireless transmission between the base station and the terminal, because the air interface resource is used for transmission.
  • the delay in information transmission is very low, so that the first base station can quickly transmit the cooperative communication mode and link parameters to the second base station serving as the serving base station through the air interface resource. Since the first base station and the second base station can quickly perform information interaction through air interface resources, the overall performance of cooperative communication between the base stations can be greatly improved.
  • the air interface resource in the embodiment of the present invention may include: a partial subframe transmitted by the first base station and the second base station by using a wireless link, or a partial OFDM in the subframe. symbol.
  • time-frequency resources are divided into sub-frames, and each sub-frame is further divided into multiple OFDM (Orthogonal Frequency Division Multiplexing) symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • these resources are all It is used to provide transmission services for the UE.
  • the base stations can negotiate through backhaul, and use part of the subframes or part of the OFDM symbols as information interaction between the base stations. Specifically, it is necessary to determine which of the above-mentioned air interface resources are used to implement information transmission from the first base station to the second base station, and which are used to implement information transmission from the second base station to the first base station.
  • the implementation method of the communication mode transmission module The formula is also different, and may specifically include the following forms:
  • the communication mode transmission module includes:
  • a first serving base station determining module configured to determine, when the cooperative communication mode is a JT mode, the second base station is the serving base station;
  • a first link parameter receiving module configured to receive a first link parameter and a second link parameter sent by the terminal
  • a first serving base station link parameter determining module configured to determine, according to the first link parameter and the second link parameter, a link parameter that is required by the second base station according to the joint transmission mode
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal
  • the second link parameter is if the first base station is The link parameters determined by the terminal when the second base station jointly provides services for the terminal.
  • the communication mode transmission module includes:
  • a second serving base station determining module configured to determine, as the serving base station, a base station in which a channel condition meets a threshold when the cooperative communication mode is a DPS transmission mode;
  • a second link parameter receiving module configured to receive a first link parameter and a third link parameter sent by the terminal
  • a second serving base station link parameter determining module configured to determine, according to the first link parameter and the third link parameter, a link parameter that the serving base station needs to adopt;
  • the first link parameter is a link parameter determined by the terminal when the first base station separately provides a service for the terminal
  • the third link parameter is if the second base station is separate
  • the communication mode transmission module includes:
  • a third serving base station determining module configured to determine that the serving base station is the serving base station when the cooperative communication mode is a CLA mode
  • a third link parameter receiving module configured to receive a fourth link parameter and a fifth link parameter sent by the terminal
  • An interference determining module configured to receive scheduling parameters sent by the second base station by using the air interface resource, to determine interference generated by the second base station to the first base station;
  • a third serving base station link parameter determining module configured to determine, according to the fourth link parameter and the fifth link parameter, and the interference generated by the second base station to the first base station, that the first base station is configured according to Link parameters required for the joint link adaptive transmission mode;
  • the fourth link parameter is a link parameter determined by the terminal if the first base station provides service for the terminal separately, and the second base station does not cause interference to the terminal;
  • the fifth link parameter is a link parameter determined by the terminal if the second base station provides service for the terminal separately, and the second base station causes interference to the terminal.
  • an embodiment of a second base station provided by the present disclosure may specifically include:
  • the communication mode receiving module 901 is configured to: when the second base station serves as a serving base station serving the terminal, receive the first air resource by using a part of the air interface resource for performing information interaction with the first base station The cooperative communication mode sent by the base station and the link parameters required by the serving base station;
  • the service module 902 is configured to provide services for the terminal according to the link parameters.
  • the second base station serving as the serving base station negotiates with the first base station through the backhaul, and a part of the air interface resources is used to perform information exchange between the base stations.
  • the receiving module 901 is received by the second base station, and the second base station receives, by using the air interface resource, the cooperative communication manner sent by the first base station and the link parameters required by the serving base station.
  • the cooperation between the first base station and the second base station and the link parameters used by the serving base station are performed by using the air interface resource for performing wireless transmission between the base station and the terminal, because the air interface is utilized.
  • the second base station serves as the serving base station serving the terminal
  • the second base station can quickly obtain the first base through the air interface resource.
  • the cooperative communication method determined by the station and the link parameters required by the serving base station. Since the first base station and the second base station can quickly perform information interaction through air interface resources, the overall performance of cooperative communication between the base stations can be greatly improved.
  • the air interface resource includes: a part of a time-frequency resource that is transmitted by using the radio link between the second base station and the first base station, where the time-frequency resource includes: a subframe or the subframe Part of the OFDM symbol.
  • the present invention further provides a first base station implemented based on a computer system.
  • the first base station in the embodiment of the present invention may include: a processor 1001, a memory 1002, a bus 1003, and a transmitter 1004.
  • the processor 1001, the memory 1002, and the transmitter 1004 are connected to each other through the bus 1003; the memory 1002 is configured to store computer execution instructions; the processor 1001 executes the computer execution instructions stored by the memory 1002, Performing an operation of: determining a part of air interface resources for performing information interaction with the second base station in the air interface resource between the first base station and the second base station; determining that the first base station and the second base station cooperate with the terminal a method of communication; determining a link parameter to be used by a serving base station serving the terminal according to the cooperative communication manner; the transmitter 1004 is configured to use the part of the air interface resource to Transmitting the link parameters to the serving base station, so that the serving base station provides services for the terminal according to the link parameters.
  • the serving base station comprising: first base station and / or the second base station.
  • the present invention further provides a second base station implemented by using a computer system.
  • the second base station in the embodiment of the present invention may include: a processor 1101, a memory 1102, a bus 1103, and a receiver 1104.
  • the processor 1101, the memory 1102, and the receiver 1104 are connected to each other through the bus 1103; the memory 1102 is configured to store computer execution instructions; and the receiver 1104 is configured to serve as a service for the terminal when the second base station serves Receiving, by the first base station, the cooperative communication mode and the link required by the serving base station, by using a part of the air interface resource for performing information interaction with the first base station, The processor 1101 executes the computer execution instructions stored by the memory 1102 to provide services for the terminal according to the link parameters.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (ROM, Read-Only) Memory, random access memory (RAM), disk or optical disk, and other media that can store program code.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un procédé et un dispositif de communication coordonnée. Le procédé consiste à : déterminer, parmi les ressources d'interface radioélectrique entre une première station de base et une seconde station de base, la partie des ressources d'interface radioélectrique utilisée pour l'échange d'informations avec la seconde station de base ; déterminer le mode de communication coordonnée utilisé par la première station de base et la seconde station de base pour communiquer avec un terminal ; déterminer, d'après le mode de communication coordonnée, les paramètres de liaison requis par une station de base de desserte pour fournir des services au terminal, la première station de base transmettant le mode de communication coordonnée et les paramètres de liaison à la station de base de desserte via la partie de l'interface radioélectrique. La station de base de desserte peut ainsi fournir des services au terminal d'après les paramètres de liaison, la station de base de desserte comprenant la première station de base et/ou la seconde station de base. Les modes de réalisation de la présente invention améliorent la communication coordonnée complète entre des stations de base dans des scénarios présentant un raccordement à forts retards.
PCT/CN2015/071425 2014-01-23 2015-01-23 Procédé et dispositif de communication coordonnée WO2015110064A1 (fr)

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