WO2014180115A1 - 用于协作传输的方法、接入点、服务器和站点 - Google Patents

用于协作传输的方法、接入点、服务器和站点 Download PDF

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Publication number
WO2014180115A1
WO2014180115A1 PCT/CN2013/087464 CN2013087464W WO2014180115A1 WO 2014180115 A1 WO2014180115 A1 WO 2014180115A1 CN 2013087464 W CN2013087464 W CN 2013087464W WO 2014180115 A1 WO2014180115 A1 WO 2014180115A1
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WIPO (PCT)
Prior art keywords
downlink
uplink
server
csi
sta
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PCT/CN2013/087464
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English (en)
French (fr)
Inventor
梁永明
张佳胤
罗毅
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP13884292.7A priority Critical patent/EP2963985B1/en
Publication of WO2014180115A1 publication Critical patent/WO2014180115A1/zh
Priority to US14/932,619 priority patent/US10193666B2/en

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Classifications

    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • 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

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method, an access point, a server, and a station for cooperative transmission.
  • WLAN wireless local area networks
  • WiFi Wireless Fidelity
  • the IEEE 802.1 IX standard uses the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) access method to simply reduce the cost of the WiFi chip or device, but the CSMA/CA is not based on the physical layer (Physical Layer).
  • PHY is based on the multiple access mode of the Media Access Control (MAC) layer, resulting in no PHY layer-based scheduling mechanism for WiFi. Therefore, when multiple stations (Stations, STAs) simultaneously appear in traffic, collisions occur. This causes a bottleneck in the data throughput of the downlink (Downlink, DL) or uplink (Uplink, UL). These bottlenecks lead to the existing WiFi cannot be mentioned For higher data throughput.
  • Embodiments of the present invention provide a method, an access point, a server, and a site for cooperative transmission, which can improve data throughput.
  • the first aspect provides a method for cooperative transmission, including: an access point (AP) receiving an uplink preamble training sequence sent by a station STA; and determining, by the AP, uplink quality information according to the uplink preamble training sequence.
  • the AP transmits the uplink quality information to the server, so that the server determines the downlink cooperative transmission set according to the uplink quality information.
  • the method further includes: receiving, by the AP, a downlink coordinated transmission set notification message sent by the server to the downlink coordinated transmission set; the AP sending an empty message to the STA according to the downlink coordinated transmission set notification message.
  • a data packet the NDP carries indication information that is a cooperative transmission type, so that the STA measures downlink channel state information (CSI); the AP receives the downlink coordinated transmission sent by the STA.
  • CSI downlink channel state information
  • the AP sends the downlink CSI corresponding to the downlink cooperative transmission set to the server, so that the server determines the cooperation information according to the downlink CSI corresponding to the downlink coordinated transmission set; the AP receives the collaboration sent by the server Information: The AP performs downlink cooperative transmission on the STA according to the collaboration information.
  • the uplink preamble training sequence is a newly added precoding symbol, and the newly added precoding symbol is used for CSI. measuring.
  • the uplink quality information includes an uplink quality indicator (LQI);
  • the determining, by the AP, the uplink quality information according to the uplink preamble training sequence includes: determining, by the energy detection (ED) algorithm, the uplink preamble
  • the Received Signal Strength Indication (RSI) of the training sequence determines the uplink LQI according to the uplink RSSI.
  • the uplink quality information includes an uplink CSI; and the AP determines an uplink according to the uplink preamble training sequence.
  • the path quality information includes: the AP determines the uplink CSI by using a CSI detection algorithm.
  • the AP receives the downlink CSI corresponding to the downlink coordinated transmission set sent by the STA, where the AP receives the STA through the carrier detect The listening/collision avoids the downlink CSI corresponding to the downlink cooperative transmission set sent by the CSMA/CA mechanism.
  • a method for cooperative transmission where: the server receives uplink quality information sent by an access point AP, where the uplink quality information is sent by the AP according to an uplink preamble training sent by the station STA. Sequence determination; the server determines a downlink cooperative transmission set according to the uplink quality information.
  • the uplink preamble training sequence is a new precoding symbol, and the newly added precoding symbol is used for channel state information CSI measurement.
  • the server determines, according to the uplink quality information, a downlink coordinated transmission set, where: the server is configured according to the uplink The road quality information determines a downlink cooperative measurement set; the server determines a downlink coordinated transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink quality indicator LQI; the server determines downlink cooperative measurement according to the uplink quality information.
  • the set includes: the server selects an uplink LQI-high AP as the downlink cooperative measurement set; the server determines a downlink cooperative transmission set in the downlink coordinated measurement set, and the: the server further selects an uplink LQI-high AP in the downlink coordinated measurement set As the downlink cooperative transmission set.
  • the uplink quality information includes an uplink CSI
  • the server determines, according to the uplink quality information, a downlink coordinated measurement set, including: The server selects an AP with a high uplink CSI as the downlink coordinated measurement set. The server determines a downlink coordinated transmission set in the downlink coordinated measurement set, and the server further selects an AP with a high uplink CSI as the downlink collaboration in the downlink coordinated measurement set. Send the set.
  • the uplink quality information includes an uplink LQI and an uplink CSI; the server determines a downlink cooperative measurement set according to the uplink quality information.
  • the server includes: selecting, by the server, an AP with a high uplink CQI as the downlink coordinated measurement set; and determining, by the server, the downlink coordinated transmission set in the downlink coordinated measurement set, where the server selects, in the downlink coordinated measurement set, an AP with a high uplink CSI as the Downstream collaborative send set.
  • the method further includes: the server sending the downlink collaboration Sending a downlink coordinated transmission set notification message; the server receives the downlink CSI corresponding to the downlink coordinated transmission set sent by the first AP in the downlink coordinated transmission set, where the downlink CSI corresponding to the downlink coordinated transmission set is the downlink according to the downlink
  • the NDP measurement of the null data packet sent by each AP in the coordinated transmission set is sent to the first AP; the server determines the cooperation information according to the downlink CSI corresponding to the downlink coordinated transmission set; the server sends the downlink data to the downlink transmission set.
  • the collaboration information is such that the downlink cooperative transmission set performs downlink cooperative transmission on the STA according to the cooperation information.
  • a third aspect provides a method for cooperative transmission, including: a station STA sending an uplink preamble training sequence to an access point AP, so that the AP determines uplink quality information according to the uplink preamble training sequence;
  • the NDP carries the null data packet NDP sent by each AP in the downlink, and the NDP carries the indication information of the cooperative transmission, the downlink cooperative transmission set is determined by the server according to the uplink quality information; and the STA measures according to the NDP.
  • the STA sends the downlink CSI corresponding to the downlink coordinated transmission set to the first AP in the downlink coordinated transmission set; the STA receives the downlink coordinated transmission set according to the cooperative information downlink cooperative transmission data, where the collaboration information is The server determines the downlink CSI corresponding to the downlink coordinated transmission set.
  • the uplink preamble training sequence is a new precoding symbol, and the newly added precoding symbol is used for CSI measurement.
  • the uplink quality information includes an uplink quality indicator LQI, where the uplink LQI is an energy detection of the AP Determined by the ED algorithm.
  • the uplink quality information includes an uplink CSI, where the uplink CSI is determined by the AP by using a CSI detection algorithm.
  • the STA sends the first AP in the set to the downlink collaboration
  • the sending the downlink CSI corresponding to the downlink coordinated transmission set includes: sending, by the STA, the downlink CSI corresponding to the downlink coordinated transmission set to the first AP by using a carrier sensing/collision avoidance CSMA/CA mechanism.
  • an access point AP including: a receiving module, configured to receive an uplink preamble training sequence sent by a station STA; and a determining module, configured to determine an uplink quality according to the uplink preamble training sequence And a sending module, configured to send the uplink quality information to the server, so that the server determines the downlink cooperative sending set according to the uplink quality information.
  • the receiving module is further configured to receive a downlink coordinated sending set notification message that is sent by the server to the downlink coordinated sending set, where the sending module is further configured to send, according to the downlink coordinated sending set notification message, the The STA sends a null data packet NDP, and the NDP carries the indication information that the feedback type is cooperative transmission, so that the STA measures the downlink channel state information CSI;
  • the receiving module is further configured to receive the downlink CSI corresponding to the downlink coordinated transmission set sent by the STA, where the sending module is further configured to send the downlink CSI corresponding to the downlink coordinated transmission set to the server, so that the server cooperates according to the downlink
  • the downlink CSI corresponding to the sending set determines the collaboration information; the receiving module is further configured to receive the collaboration information sent by the server; the sending module is further configured to perform downlink coordinated transmission on the STA according to the collaboration information.
  • the uplink preamble training sequence is a newly added precoding symbol, and the newly added precoding symbol is used for CSI. measuring.
  • the uplink quality information includes an uplink quality indicator LQI, where the determining module is specifically configured to pass The energy detection ED algorithm determines an uplink received signal strength indicator RSSI of the uplink preamble training sequence, and determines the uplink LQI according to the uplink RSSI.
  • the uplink quality information includes an uplink CSI, where the determining module is specifically configured to determine by using a CSI detection algorithm.
  • the uplink CSI is specifically configured to determine by using a CSI detection algorithm.
  • the receiving module is specifically configured to receive the downlink coordinated sending set that is sent by the STA by using a carrier sensing/collision avoidance CSMA/CA mechanism Corresponding downlink CSI.
  • a server including: a receiving module, configured to receive uplink quality information sent by an access point AP, where the uplink quality information is sent by the AP according to an uplink preamble training sequence sent by the station STA Determining a determining module, configured to determine a downlink cooperative transmission set according to the uplink quality information.
  • the uplink preamble training sequence is a new precoding symbol, and the newly added precoding symbol is used for channel state information CSI measurement.
  • the determining module includes: a first determining unit, configured to use, according to the uplink quality information Determining a downlink cooperative measurement set; a second determining unit, configured to determine a downlink cooperative transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink quality indicator LQI, where the first determining unit is specifically configured to select an uplink LQI high.
  • the AP is used as the downlink coordinated measurement set.
  • the second determining unit is specifically configured to further select an AP with a high uplink LQI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink CSI
  • the first determining unit is specifically configured to select an AP with a high uplink CSI as the downlink.
  • the second measurement unit is configured to further select an AP with a high uplink CSI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink LQI and an uplink CSI.
  • the first determining unit is specifically configured to select an AP with an uplink LQI high.
  • the second determining unit is specifically configured to select an AP with a high uplink CSI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the server further includes: a sending module, configured to The downlink cooperative transmission set sends a downlink coordinated transmission set notification message; the receiving module is further configured to receive the downlink CSI corresponding to the downlink coordinated transmission set sent by the first AP in the downlink coordinated transmission set, where the downlink cooperative transmission set corresponds to the downlink
  • the CSI is obtained by the STA according to the null data packet NDP sent by each AP in the downlink coordinated transmission set, and is sent to the first AP.
  • the determining module is further configured to determine the collaboration according to the downlink CSI corresponding to the downlink coordinated sending set.
  • the sending module is further configured to send the collaboration information to the downlink coordinated sending set, so that the downlink cooperative sending set performs downlink cooperative transmission on the STA according to the collaboration information.
  • the sixth aspect provides a station STA, including: a sending module, configured to send an uplink preamble training sequence to the access point AP, so that the AP determines an uplink according to the uplink preamble training sequence. a channel quality information; a receiving module, configured to receive an empty data packet NDP sent by each AP in the downlink coordinated transmission set, where the NDP carries indication information that is a cooperative transmission, where the downlink coordinated transmission set is a server according to the uplink quality a determining module, configured to measure downlink channel state information CSI according to the NDP; the sending module is further configured to send a downlink CSI corresponding to the downlink cooperative sending set to the first AP in the downlink coordinated sending set; the receiving module further The data for receiving the downlink cooperative transmission set to be downlink cooperatively transmitted according to the cooperation information, where the cooperation information is determined by the server according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • the uplink preamble training sequence is a new precoding symbol, and the newly added precoding symbol is used for CSI measurement.
  • the uplink quality information includes an uplink quality indicator LQI, where the uplink LQI is an energy detection of the AP Determined by the ED algorithm.
  • the uplink quality information includes an uplink CSI, where the uplink CSI is determined by the AP by using a CSI detection algorithm.
  • the sending module is specifically configured to perform carrier sensing/conflict
  • the CSMA/CA mechanism is prevented from transmitting the downlink CSI corresponding to the downlink coordinated transmission set to the first AP.
  • the embodiment of the present invention determines uplink quality information according to an uplink preamble training sequence sent by the STA, and sends the uplink quality information to a server, so that the server determines downlink collaboration according to the uplink quality information.
  • the transmit set enables coordinated transmission of multiple APs, which can improve data throughput.
  • FIG. 1 is a schematic diagram of an example of a scenario to which an embodiment of the present invention may be applied.
  • FIG. 2 is a schematic flow chart of a method for cooperative transmission according to an embodiment of the present invention.
  • 3A and 3B are schematic diagrams of an uplink preamble training sequence according to an embodiment of the present invention.
  • 4 is a schematic diagram of an uplink preamble training sequence in accordance with another embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a method of determining a downlink cooperative transmission set according to an embodiment of the present invention.
  • 6 is a schematic diagram of a method of determining a downlink cooperative transmission set according to another embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a method for determining a downlink cooperative transmission set according to still another embodiment of the present invention.
  • FIG. 8 is another schematic flowchart of a method for cooperative transmission according to an embodiment of the present invention.
  • 9A through 9C are schematic views of an SNDP according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a method of feeding back downlink CSI according to an embodiment of the present invention.
  • FIG. 11 is a schematic flow chart of a method for cooperative transmission according to another embodiment of the present invention.
  • FIG. 12 is a schematic flow chart of a method of determining a downlink cooperative transmission set according to an embodiment of the present invention.
  • FIG. 13 is another schematic flowchart of a method for cooperative transmission according to another embodiment of the present invention.
  • Figure 14 is a schematic flow diagram of a method for cooperative transmission in accordance with yet another embodiment of the present invention.
  • 15 is a schematic diagram of interaction of a method for cooperative transmission in accordance with an embodiment of the present invention.
  • Figure 16 is a schematic block diagram of an AP in accordance with an embodiment of the present invention.
  • Figure 17 is a schematic block diagram of a server in accordance with an embodiment of the present invention.
  • FIG. 18 is a schematic block diagram of a STA according to an embodiment of the present invention.
  • FIG. 19 is a schematic structural diagram of an AP according to an embodiment of the present invention.
  • FIG. 20 is a schematic structural diagram of a server according to an embodiment of the present invention.
  • FIG. 21 is a schematic structural diagram of a STA according to an embodiment of the present invention.
  • the link of the AP to the STA is referred to as a downlink
  • the link of the STA to the AP is referred to as an uplink
  • the descriptions of the uplink and the downlink are not applicable to the embodiment of the present invention.
  • the scope of protection constitutes a limitation.
  • the communication system 100 of FIG. 1 includes an AP 101, a server 102, and a STA 103.
  • a plurality of STAs 103 are distributed among the coverages of the plurality of APs 101.
  • a plurality of APs 101 are connected to the server 102 in a wired or wireless manner via Backhaul.
  • the server (Server) is also called an access controller (AC).
  • Multiple APs 101 can use the same cell ID. In this case, multiple APs 101 are transparent to STA 103, that is, STA 103 cannot distinguish which AP 101 or which AP-101 services are specifically served by itself. Alternatively, multiple APs 101 may use different cell IDs, which is not limited in this embodiment of the present invention.
  • FIG. 2 shows a schematic flow diagram of a method 200 for cooperative transmission in accordance with an embodiment of the present invention.
  • the method of Figure 2 is performed by an AP (e.g., AP 101 of Figure 1).
  • the method 200 includes: S210.
  • the AP receives an uplink preamble training sequence sent by the STA.
  • the AP determines uplink quantity information according to the uplink preamble training sequence.
  • S230 The AP sends the uplink quality information to the server, so that the server determines the downlink cooperative transmission set according to the uplink quality information.
  • uplink quality information is determined by using an uplink preamble training sequence (Preamble), and reciprocity of uplink and downlink links is utilized, based on uplink quality information.
  • the downlink coordinated transmission set is determined for downlink coordinated transmission.
  • the AP first receives the uplink preamble training sequence sent by the STA, determines uplink quality information according to the uplink preamble training sequence, and sends the uplink quality information to the server.
  • the server determines a downlink cooperative transmission set based on the uplink quality information. In this way, cooperative transmission of multiple APs can be implemented in the WiFi system, thereby improving data throughput.
  • the method for cooperative transmission determines uplink quality information according to an uplink preamble training sequence sent by a STA, and sends the uplink quality information to a server to make the server according to the uplink.
  • the quality information determines the downlink cooperative transmission set, and the coordinated transmission of multiple APs can be realized, thereby improving data throughput.
  • the AP receives an uplink preamble training sequence sent by the STA.
  • the STA sends an uplink preamble training sequence to all APs in the vicinity, so that each AP determines corresponding uplink quality information.
  • the AP receives the uplink preamble training sequence sent by the STA to obtain uplink quality information.
  • the uplink preamble training sequence may use a preamble training sequence in an existing standard or a new preamble training sequence.
  • the uplink preamble training sequence is a newly added precoding symbol, and the newly added precoding symbol is used for CSI measurement.
  • a VVHT-LTF-CSI field may be added to the existing frame format, which uses precoding symbols as an uplink preamble training sequence for measuring uplink quality.
  • the VVHT-LTF-CSI field may be after the VVHT-SIG-A field, as shown in FIG. 3A; the VVHT-LTF-CSI field may precede the VVHT-SIG-A field, as shown in FIG. 3B.
  • the uplink preamble training sequence may also be a preamble training sequence in the existing standard.
  • the uplink quality can be measured using the L-STF field and the L-LTF field in FIG.
  • the AP determines uplink quality information according to the uplink preamble training sequence.
  • the AP detects the uplink preamble training sequence to obtain uplink quality information.
  • the uplink quality information includes an uplink LQI
  • S220 includes:
  • the AP determines an uplink RSSI of the uplink preamble training sequence by using an ED algorithm, and determines the uplink LQI according to the uplink RSSI.
  • the AP receives the uplink preamble training sequence and detects the uplink RSSI through the ED algorithm, and then quantizes the uplink RSSI into the uplink LQI.
  • the uplink quality information includes an uplink CSI
  • S220 includes:
  • the AP determines the uplink CSI through a CSI detection algorithm.
  • the AP receives the uplink preamble training sequence and detects the uplink CSI through the CSI detection algorithm. For example, when using the uplink preamble training sequence shown in Figure 3A or Figure 3B, the AP obtains the uplink CSI by detecting the precoding symbols of the newly added VVHT-LTF-CSI field.
  • the AP sends the uplink quality information to the server, so that the server determines the downlink cooperative transmission set according to the uplink quality information.
  • Each AP sends the measured uplink quality information, such as the LQI and/or the uplink CSI, to the server, and the server utilizes the reciprocity of the uplink and downlink, and determines the downlink cooperative transmission set according to the uplink quality information.
  • the measured uplink quality information such as the LQI and/or the uplink CSI
  • the server may first determine a downlink coordinated measurement set according to the uplink quality information, and then determine a downlink coordinated transmission set in the downlink coordinated measurement set.
  • the server first selects an AP with a high uplink LQI as the downlink coordinated measurement set, and further selects an AP with a high uplink LQI as the downlink collaboration in the downlink coordinated measurement set. Send the set.
  • the server selects 4 APs with the best LQI (such as exceeding the threshold), that is, 4 APs of A, B, C, and D. Since the WiFi system is a Time Division Duplexing (TDD) system, the downlink and the uplink have reciprocity, that is, the downlink quality and the uplink quality are similar, then the best LQI of the uplink LQI is the best.
  • TDD Time Division Duplexing
  • the downlink LQI corresponding to the four APs of C, D and D is also the best, that is, the downlink CSI of the four APs A, B, C and D is also the best. Therefore, the server determines the four APs A, B, C, and D as the Downlink Coordinated Measurement Set (DCMS).
  • DCMS Downlink Coordinated Measurement Set
  • WiFi system is mostly indoor system or low speed or medium speed system
  • the relative change of channel is relatively slow, large scale, medium scale, small scale
  • the fading is not very serious. Therefore, the DCMS changes relatively slowly, which provides a realistic scenario for the DL and UL reciprocity of the TDD system and the application of the ED detection algorithm.
  • the server selects two Cs and Ds with the highest uplink LQI as the Downlink Coordinated Transmission Set (DCTS) in the downlink cooperative measurement set, namely, A, B, C, and D.
  • DCTS Downlink Coordinated Transmission Set
  • the reason why DCTS is determined according to DCMS is also because WiFi systems are mostly indoor systems or low-speed or medium-speed systems. The relative changes of channels are relatively slow, and large-scale, medium-scale, and small-scale fading are not very serious. Therefore, DCTS changes relatively. It is not very large, therefore, there must be an AP of DCTS in the DCMS.
  • the server first selects an AP with a high uplink CSI as the downlink coordinated measurement set, and further selects an AP with a high uplink CSI as the downlink collaboration in the downlink coordinated measurement set. Send the set.
  • the server selects four APs with the best CSI (such as exceeding the threshold), namely, B, C, and D.
  • four APs of eight, B, C, and D are determined as downlink cooperative measurement sets.
  • the server selects two APs A and D with the highest uplink CSI as the downlink cooperative transmission set in the downlink cooperative measurement set, namely, A, B, C, and D.
  • the service The AP selects an AP with an uplink LQI as the downlink cooperative measurement set, and then selects an AP with a high uplink CSI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the server selects the four APs with the best LQI (such as exceeding the threshold), that is, eight APs of eight, B, C, and D. According to the reciprocity of the uplink and downlink, four APs of eight, B, C, and D are determined as downlink cooperative measurement sets. Then, the server selects two APs A and D with the highest uplink CSI as the downlink cooperative transmission set in the downlink cooperative measurement set, namely, A, B, C, and D.
  • the method 200 further includes: S240, the AP receives a downlink coordinated sending set notification message sent by the server to the downlink coordinated sending set;
  • the AP sends an NDP to the STA according to the downlink coordinated transmission set notification message, where the NDP carries the indication information of the cooperative transmission type, so that the STA measures the downlink CSI;
  • the AP receives the downlink CSI corresponding to the downlink coordinated transmission set sent by the STA.
  • the AP sends the downlink CSI corresponding to the downlink coordinated transmission set to the server, so that the server corresponds to the downlink coordinated transmission set.
  • the downlink CSI determines the collaboration information
  • the AP receives the collaboration information sent by the server.
  • the AP performs downlink cooperative transmission on the STA according to the collaboration information.
  • the server After determining the downlink coordinated transmission set, the server sends a notification message to the downlink coordinated transmission set, and notifies the determined downlink coordinated transmission set to each AP in the downlink coordinated transmission set.
  • the AP receives the notification message, determines that it is in the downlink coordinated transmission set, and then notifies the STA to feed back the downlink CSI.
  • the AP sends an NDP to the STA, so that the STA measures the downlink CSI.
  • the NDP carries the indication information that the feedback type is the coordinated transmission, that is, the AP carries an indication information in the NDP sent to the STA, indicating that the feedback type is coordinated transmission.
  • the NDP is called SNDP. (Sounding NDP), as shown in Figure 9A.
  • the 2 types of bits reserved in the Sounding Dialog Token field in the NDP frame format may be used to indicate the feedback type. For example, 00 means no cooperation, 01 Representatives have collaboration, 10 continue to retain, 11 continue to retain.
  • the STA info field in the NDP frame format may be extended, and the STA info field is increased to 3 bytes (bytes), that is, the Feedback Type field in the STA info field is expanded to 9 bits.
  • the Feedback Type field can also indicate the newly added collaborative feedback type.
  • the STA detects the downlink CSI corresponding to each AP by detecting the NDP sent by the AP in the downlink coordinated transmission set, and obtains the downlink CSL corresponding to the downlink coordinated transmission set. That is, the downlink CSI corresponding to the downlink coordinated transmission set includes the downlink coordinated transmission set. The downlink CSI corresponding to each AP. Then, the STA sends the downlink CSI corresponding to the downlink coordinated transmission set to the AP (indicated as the first AP) in the downlink coordinated transmission group, so that the AP receives the downlink CSI corresponding to the downlink coordinated transmission set.
  • S260 includes:
  • the AP receives the downlink CSI corresponding to the downlink coordinated transmission set sent by the STA through the CSMA/CA mechanism.
  • the downlink CSI corresponding to the downlink coordinated transmission set is fed back on its own uplink, that is, the downlink CSI corresponding to each AP in the downlink coordinated transmission set is fed back.
  • both the C and D APs in the downlink coordinated transmission set send data to the STA cooperatively, and the STA measures the corresponding DL CSI (C) and DL CSI (D).
  • the STA uplink still uses the CSMA/CA access mechanism, and the STA feeds back DL CSI (C) and DL CSI (D) to C, thus ensuring timely feedback of both DL CSI (C) and DL CSI (D).
  • the AP sends the downlink CSI corresponding to the received downlink cooperative transmission set to the server.
  • the server determines the collaboration information according to the downlink CSI corresponding to the downlink coordinated transmission set. That is, the server performs downlink CSI information exchange between multiple APs, performs joint scheduling of resources, determines cooperation information, and transmits the cooperation information to each AP in the downlink coordinated transmission set.
  • the method for cooperative transmission sends the uplink quality information determined according to the uplink preamble training sequence sent by the STA to the server to determine a downlink coordinated transmission set, and the reusing server according to the downlink cooperative transmission set.
  • the downlink cooperative transmission information determined by the downlink CSI can perform coordinated transmission of multiple APs, thereby improving data throughput.
  • FIG. 11 shows a schematic flow diagram of a method 1100 for cooperative transmission in accordance with another embodiment of the present invention.
  • the method of Figure 11 is performed by a server (e.g., server 102 of Figure 1).
  • the method 1100 includes:
  • the server receives uplink quality information sent by the AP, where the uplink quality information is determined by the AP according to an uplink preamble training sequence sent by the STA.
  • the server determines a downlink cooperative transmission set according to the uplink quality information.
  • the uplink quality information is determined by the uplink preamble training sequence, and the reciprocity of the uplink and downlink is utilized, and the downlink cooperative transmission set is determined based on the uplink quality information to perform downlink cooperative transmission.
  • the AP first receives the uplink preamble training sequence sent by the STA, determines uplink quality information according to the uplink preamble training sequence, and sends the uplink quality information to the server. After receiving the uplink quality information, the server determines a downlink cooperative transmission set according to the uplink quality information. In this way, cooperative transmission of multiple APs can be implemented in the WiFi system, thereby improving data throughput.
  • the method for cooperative transmission in the embodiment of the present invention determines the downlink coordinated transmission set by using the uplink quality information determined according to the uplink preamble training sequence sent by the STA, and can implement coordinated transmission of multiple APs, thereby improving data throughput. the amount.
  • the uplink preamble training sequence is a new precoder No.
  • the new precoding symbol is used for CSI measurement, as shown in Figure 3A and Figure 3B for the VVHT-LTF-CSI field.
  • the uplink preamble training sequence may also be a preamble training sequence in an existing standard.
  • the uplink quality may be measured by using the L-STF field and the L-LTF field in FIG. 4.
  • S1120 includes:
  • the server determines a downlink cooperative measurement set according to the uplink quality information.
  • the server determines a downlink cooperative transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink LQI
  • S1121 includes:
  • the server selects an AP with an uplink LQI as the downlink cooperative measurement set
  • S1122 includes:
  • the server further selects an AP with a high uplink LQI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the server selects four APs with the best LQI (such as exceeding the threshold), namely, B, C, and D.
  • LQI such as exceeding the threshold
  • four APs of eight, B, C, and D are determined as downlink cooperative measurement sets.
  • the server selects two APs A and D with the highest uplink LQI as the downlink cooperative transmission set in the downlink cooperative measurement set, namely, A, B, C, and D.
  • the uplink quality information includes an uplink CSI
  • S1121 includes:
  • the server selects an AP with a high uplink CSI as the downlink coordinated measurement set
  • S1122 includes:
  • the server further selects an AP with a high uplink CSI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the server selects 4 APs with the best uplink CSI (such as exceeding the threshold), that is, B, C, and D 4 APs.
  • the APs are determined to be downlink cooperative measurement sets.
  • the server selects two APs A and D with the highest uplink CSI as the downlink cooperative transmission set in the downlink cooperative measurement set, that is, the four APs A, B, C, and D.
  • the uplink quality information includes an uplink LQI and an uplink CSI
  • S1121 includes:
  • the server selects an AP with an uplink LQI as the downlink cooperative measurement set
  • S1122 includes:
  • the server selects an AP with a high uplink CSI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the server selects the four APs with the best LQI (such as exceeding the threshold), that is, eight APs of eight, B, C, and D. According to the reciprocity of the uplink and downlink, four APs of eight, B, C, and D are determined as downlink cooperative measurement sets. Then, the server selects two APs A and D with the highest uplink CSI as the downlink cooperative transmission set in the downlink cooperative measurement set, namely, A, B, C, and D.
  • the method 1100 further includes: S1130, the server sends a downlink cooperative transmission set notification message to the downlink coordinated transmission set; S1140, the server receives the downlink coordinated transmission a downlink CSI corresponding to the downlink coordinated transmission set sent by the first AP, where the downlink CSI corresponding to the downlink coordinated transmission set is measured by the STA according to the null data packet NDP sent by each AP in the downlink coordinated transmission set. And sent to the first AP;
  • S1150 The server determines the collaboration information according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • S1160 The server sends the collaboration information to the downlink coordinated transmission set, so that the downlink coordinated transmission set performs downlink cooperation on the STA according to the collaboration information. transmission.
  • the server After determining the downlink cooperative transmission set, the server sends a notification message to the downlink cooperative sending set.
  • the AP receives the notification message, determines that it is in the downlink coordinated transmission set, and then notifies the STA to feed back the downlink CSI.
  • the AP sends an NDP to the STA, which measures the downlink CSI.
  • STA passes the detection downlink
  • the NDPs sent by the APs in the centralized transmission are coordinated, and the downlink CSI corresponding to each AP is measured, and the downlink CSI corresponding to the downlink coordinated transmission set is obtained. That is, the downlink CSI corresponding to the downlink coordinated transmission set includes the downlink CSI corresponding to each AP in the downlink coordinated transmission set.
  • the STA sends the downlink CSI corresponding to the downlink coordinated transmission set to one AP (represented as the first AP) in the downlink coordinated transmission.
  • the first AP sends the downlink CSI corresponding to the received downlink cooperative transmission set to the server.
  • the server determines the collaboration information according to the downlink CSI corresponding to the downlink coordinated transmission set. That is to say, the server exchanges downlink CSI information between multiple APs, and performs joint scheduling of resources to determine cooperation information.
  • the server then sends the collaboration information to the downlink cooperative transmission set, so that the downlink cooperative transmission set performs downlink cooperative transmission on the STA according to the cooperation information.
  • the method for cooperative transmission according to the embodiment of the present invention determines the downlink cooperative transmission set by using the uplink quality information determined according to the uplink preamble training sequence sent by the STA, and performs downlink cooperation according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • the coordinated information transmitted can realize coordinated transmission of multiple APs, thereby improving data throughput.
  • the method for cooperative transmission according to the embodiment of the present invention is described in detail from the perspective of the AP and the server.
  • the method for cooperative transmission according to the embodiment of the present invention is described below from the perspective of the STA.
  • FIG. 14 shows a schematic flow diagram of a method 1400 for cooperative transmission in accordance with yet another embodiment of the present invention.
  • the method of Figure 14 is performed by a STA (e.g., STA 103 of Figure 1).
  • the method 1400 includes:
  • the STA sends an uplink preamble training sequence to the AP, so that the AP determines uplink quality information according to the uplink preamble training sequence.
  • the STA receives the NDP sent by each AP in the downlink coordinated transmission set, where the NDP carries the indication information that the feedback type is coordinated transmission, and the downlink coordinated transmission set is the server according to the Determined by the uplink quality information;
  • the STA measures downlink CSI according to the NDP
  • the STA sends the downlink CSI corresponding to the downlink cooperative transmission set to the first AP in the downlink coordinated transmission set.
  • the STA receives the data that is transmitted by the downlink cooperative transmission set according to the downlink information of the cooperation information, where the collaboration information is determined by the server according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • the uplink quality information is determined by the uplink preamble training sequence, and the reciprocity of the uplink and downlink is utilized, and the downlink cooperative transmission set is determined based on the uplink quality information to perform downlink cooperative transmission.
  • the STA sends an uplink preamble training sequence to the AP, and the AP determines uplink quality information according to the uplink preamble training sequence, and then sends the uplink quality information to the server, where the server determines the downlink cooperative transmission set according to the uplink quality information. And notify the downlink cooperation to send the centralized AP.
  • the AP After receiving the notification message, the AP determines that it is in the downlink coordinated transmission set, and then notifies the STA to feed back each AP in the downlink CSL downlink cooperative transmission set to send the NDP to the STA, where the NDP carries the indication information of the cooperative transmission, that is, The AP carries an indication message in the NDP sent to the STA, indicating that the feedback type is cooperative transmission.
  • the NDP is referred to as an SNDP, as shown in FIG. 9A.
  • the 2 types of bits reserved in the Sounding Dialog Token field in the NDP frame format may be used to indicate the feedback type.
  • the STA info field in the NDP frame format may be extended, and the STA info field is increased to 3 bytes, that is, the Feedback Type field in the STA info field is expanded to 9 bits.
  • the Feedback Type field can also indicate the newly added collaborative feedback type.
  • the STA detects the downlink CSI corresponding to each AP by detecting the NDP sent by the AP in the downlink coordinated transmission set, and obtains the downlink CSI corresponding to the downlink coordinated transmission set. That is, the downlink CSI corresponding to the downlink coordinated transmission set includes the downlink CSI corresponding to each AP in the downlink coordinated transmission set. Of course Afterwards, the STA sends the downlink CSI corresponding to the downlink coordinated transmission set to one AP (represented as the first AP) in the downlink coordinated transmission.
  • the S1440 includes:
  • the STA sends the downlink CSI corresponding to the downlink coordinated transmission set to the first AP by using a CSMA/CA mechanism.
  • the downlink CSI corresponding to the downlink coordinated transmission set is fed back on its own uplink, that is, the downlink CSI corresponding to each AP in the downlink coordinated transmission set is fed back.
  • the AP sends the downlink CSI corresponding to the received downlink cooperative transmission set to the server.
  • the server determines the collaboration information according to the downlink CSI corresponding to the downlink coordinated transmission set, and sends the collaboration information to the downlink coordinated transmission set.
  • the downlink cooperative transmission set performs downlink cooperative transmission on the STA according to the cooperation information.
  • the STA receives the data of the downlink cooperative transmission set downlink cooperative transmission according to the cooperation information.
  • the uplink preamble training sequence is a new precoding symbol, and the newly added precoding symbol is used for CSI measurement.
  • the uplink quality information includes an uplink LQI, where the uplink LQI is determined by the ED algorithm.
  • the uplink quality information includes an uplink CSI, where the uplink CSI is determined by the AP through a CSI detection algorithm.
  • the method for cooperative transmission in the embodiment of the present invention sends an uplink preamble training sequence for determining uplink quality information to an AP, and sends a downlink corresponding to the downlink cooperative transmission set to the first AP in the downlink coordinated transmission set.
  • CSI can realize coordinated transmission of multiple APs, thereby improving data throughput.
  • the STA sends an uplink preamble training sequence to all nearby APs.
  • the uplink preamble training sequence may be a new precoding symbol, such as the VVHT-LTF-CSI field shown in FIG. 3A and FIG. 3B, or may be a preamble training sequence in the existing standard, as shown in FIG. STF field and L-LTF field.
  • the AP determines uplink quality information according to the uplink preamble training sequence.
  • the uplink quality information includes an uplink LQI and/or an uplink CSI
  • the AP determines an uplink LQI by using an ED algorithm, and determines the uplink CSI by using a CSI detection algorithm.
  • the AP sends the uplink quality information to the server.
  • the server determines a downlink cooperative measurement set according to the uplink quality information.
  • the server selects an uplink LQI or an uplink CSI-high AP as a downlink coordinated measurement set according to the reciprocity of the downlink and the uplink.
  • the server determines a downlink cooperative sending set in the downlink coordinated measurement set.
  • the server selects an uplink LQI or an uplink CSI-high AP as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the server sends a downlink coordinated sending set notification message to the downlink coordinated sending set.
  • the AP notifies the STA to feed back the downlink CSI.
  • the AP in the downlink coordinated transmission set sends downlink signaling to notify the STA to feed back the downlink CSI.
  • the AP sends an NDP to the STA.
  • the AP in the downlink coordinated transmission group sends an NDP to the STA, where the NDP carries the indication information of the cooperative transmission type, and may use the 2 bits reserved in the Sounding Dialog Token field in the NDP frame format to indicate the feedback type, or may also adopt The manner in which the STA info field in the NDP frame format is extended indicates the feedback type.
  • the STA measures the downlink CSI.
  • the STA detects the downlink CSI corresponding to each AP by detecting the NDP sent by the AP in the downlink coordinated transmission set, and obtains the downlink CSI corresponding to the downlink coordinated transmission set.
  • the STA sends, to the AP, a downlink CSI corresponding to the downlink coordinated transmission set.
  • the STA sends the downlink CSI corresponding to the downlink coordinated transmission set to one AP in the downlink coordinated transmission group. For example, when the STA competes successfully in the CSMA/CA mechanism, the STA feeds back the downlink cooperative transmission set corresponding to the uplink on the uplink. Downstream CSI.
  • the AP sends the downlink CSI corresponding to the downlink coordinated sending set to the server.
  • the server determines the collaboration information according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • the server exchanges downlink CSI information between multiple APs, and performs joint scheduling of resources to determine collaboration information.
  • the server sends the collaboration information to the AP.
  • the server sends the collaboration information to each AP in the downlink coordinated transmission set.
  • the AP performs downlink cooperative transmission on the STA according to the collaboration information.
  • each AP in the downlink coordinated transmission group After receiving the collaboration information sent by the server, each AP in the downlink coordinated transmission group transmits data to the STA in downlink cooperation.
  • the method for cooperative transmission in the embodiment of the present invention sends an uplink preamble training sequence for determining uplink quality information to an AP, and the AP sends the determined uplink quality information to the server to determine downlink cooperative transmission.
  • the re-use server performs downlink cooperative transmission according to the cooperation information determined by the downlink CSI corresponding to the downlink cooperative transmission set, and can implement coordinated transmission of multiple APs, thereby improving data throughput.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • FIG. 16 shows a schematic block diagram of an AP 1600 in accordance with an embodiment of the present invention.
  • the AP 1600 includes:
  • the receiving module 1610 is configured to receive an uplink preamble training sequence sent by the station STA, where the determining module 1620 is configured to determine uplink quality information according to the uplink preamble training sequence, and the sending module 1630 is configured to send the uplink quality information to a server, so that the server determines a downlink cooperative transmission set according to the uplink quality information.
  • the AP of the embodiment of the present invention determines the uplink quality information according to the uplink preamble training sequence sent by the STA, and sends the uplink quality information to the server, so that the server determines the downlink cooperative sending set according to the uplink quality information.
  • the cooperative transmission of multiple APs can be realized, thereby improving data throughput.
  • the receiving module 1610 is further configured to receive a downlink cooperative sending set notification message sent by the server to the downlink cooperative sending set.
  • the sending module 1630 is further configured to send, according to the downlink cooperative transmission set notification message, the null data packet NDP, where the NDP carries the indication information of the cooperative transmission type, so that the STA measures the downlink channel state information CSI;
  • the receiving module 1610 is further configured to receive the downlink CSI corresponding to the downlink cooperative transmission set sent by the STA;
  • the sending module 1630 is further configured to send the downlink CSI corresponding to the downlink coordinated sending set to the server, so that the server determines the collaboration information according to the downlink CSI corresponding to the downlink coordinated sending set;
  • the receiving module 1610 is further configured to receive the collaboration information sent by the server;
  • the sending module 1630 is further configured to perform downlink cooperative transmission on the STA according to the collaboration information.
  • the uplink preamble training sequence is a newly added precoding symbol, and the newly added precoding symbol is used for CSI measurement.
  • the uplink quality information includes an uplink quality indicator LQI;
  • the determining module 1620 is specifically configured to determine an uplink received signal strength indicator RSSI of the uplink preamble training sequence by using an energy detection ED algorithm, and determine the uplink LQI according to the uplink RSSI.
  • the uplink quality information includes an uplink CSI.
  • the determining module 1620 is specifically configured to determine the uplink CSI by using a CSI detection algorithm.
  • the receiving module 1610 is specifically configured to receive the downlink CSL corresponding to the downlink coordinated sending set sent by the STA through the carrier sensing/collision avoidance CSMA/CA mechanism.
  • the AP 1600 may correspond to an AP in a method for cooperative transmission according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the AP 1600 are respectively implemented in order to implement FIG. 1 to FIG.
  • the corresponding processes of the respective methods in FIG. 15 are not repeated here for brevity.
  • the AP of the embodiment of the present invention sends uplink quality information determined according to the uplink preamble training sequence sent by the STA to the server to determine a downlink coordinated transmission set, and then uses the collaboration information determined by the server according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • Downlink coordinated transmission enables coordinated transmission of multiple APs, thereby improving data throughput.
  • FIG 17 shows a schematic block diagram of a server 1700 in accordance with an embodiment of the present invention.
  • the server 1700 includes:
  • the receiving module 1710 is configured to receive the uplink shield information sent by the access point AP, where the uplink quality information is determined by the AP according to the uplink preamble training sequence sent by the station STA, and the determining module 1720 is configured to:
  • the uplink quality information determines a downlink coordinated transmission set.
  • the server of the embodiment of the present invention determines the downlink cooperative transmission set by using the uplink quality information determined according to the uplink preamble training sequence sent by the STA, and can implement coordinated transmission of multiple APs, thereby improving data throughput.
  • the uplink preamble training sequence is a newly added precoding symbol, and the newly added precoding symbol is used for channel state information CSI measurement.
  • the determining module 1720 includes: a first determining unit, configured to determine a downlink cooperative measurement set according to the uplink quality information, and a second determining unit, configured to determine a downlink cooperative transmit set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink quality indicator LQI;
  • the first determining unit is specifically configured to select an AP with an uplink LQI high as the downlink cooperative measurement set;
  • the second determining unit is specifically configured to further select an AP with an uplink LQI high as the downlink cooperative transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink CSI
  • the first determining unit is specifically configured to select an AP with a high uplink CSI as the downlink coordinated measurement set;
  • the second determining unit is specifically configured to further select an AP with a high uplink CSI as the downlink coordinated transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink LQI and an uplink CSI
  • the first determining unit is specifically configured to select an AP with an uplink LQI high as the downlink cooperative measurement set;
  • the second determining unit is specifically configured to select, in the downlink coordinated measurement set, an AP with a high uplink CSI as the downlink coordinated transmission set.
  • the server 1700 further includes: a sending module 1730, configured to send a downlink coordinated sending set notification message to the downlink coordinated sending set;
  • the receiving module 1710 is further configured to receive the downlink CSI corresponding to the downlink coordinated transmission set sent by the first AP in the downlink coordinated transmission set, where the downlink CSI corresponding to the downlink coordinated transmission set is the STA according to the downlink coordinated transmission set.
  • the null data packet NDP sent by each AP is measured and sent to the first AP;
  • the determining module 1720 is further configured to determine collaboration information according to the downlink CSI corresponding to the downlink cooperative transmission set;
  • the sending module 1730 is further configured to send the collaboration information to the downlink cooperative transmission set, so that the downlink cooperative transmission set performs downlink cooperative transmission on the STA according to the collaboration information.
  • the server 1700 may correspond to a server in a method for cooperative transmission according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the server 1700 are respectively implemented in order to implement FIG. 1 to FIG.
  • the corresponding processes of the respective methods in FIG. 15 are not repeated here for brevity.
  • the server of the embodiment of the present invention determines the downlink cooperative transmission set by using the uplink quality information determined by the uplink preamble training sequence sent by the STA, and determines the cooperation information of the downlink coordinated transmission according to the downlink CSI corresponding to the downlink coordinated transmission set, which can be implemented. Cooperative transmission of multiple APs, thereby increasing data throughput.
  • FIG. 18 shows a schematic block diagram of a STA 1800 in accordance with an embodiment of the present invention.
  • the STA 1800 includes:
  • the sending module 1810 is configured to send an uplink preamble training sequence to the access point AP, so as to facilitate the
  • the AP determines uplink quality information according to the uplink preamble training sequence
  • the receiving module 1820 is configured to receive the null data packet NDP sent by each AP in the downlink coordinated transmission set, where the NDP carries the indication information that the feedback type is coordinated transmission, where the downlink coordinated transmission set is determined by the server according to the uplink quality information. ;
  • the measuring module 1830 is configured to measure downlink channel state information CSI according to the NDP;
  • the sending module 1810 is further configured to send the downlink CSI corresponding to the downlink cooperative transmission set to the first AP in the downlink coordinated transmission set.
  • the receiving module 1820 is further configured to receive data that is downlink and cooperatively transmitted according to the collaboration information, where the collaboration information is determined by the server according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • the uplink preamble training sequence is a new precoder No.
  • the new precoding symbol is used for CSI measurement.
  • the uplink quality information includes an uplink quality indicator LQI, where the uplink LQI is determined by the AP through an energy detection ED algorithm.
  • the uplink quality information includes an uplink CSI, where the uplink CSI is determined by the AP by using a CSI detection algorithm.
  • the sending module 1810 is specifically configured to perform carrier sensing.
  • the CSMA/CA mechanism sends the downlink corresponding to the downlink cooperative transmission set to the first AP.
  • the STA 1800 may correspond to STAs in a method for cooperative transmission according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the STA 1800 are respectively implemented in order to implement FIG. 1 to FIG.
  • the corresponding processes of the respective methods in FIG. 15 are not repeated here for brevity.
  • the STA of the embodiment of the present invention can implement multiple uplink APs by sending an uplink preamble training sequence for determining the uplink quality information to the AP, and sending the downlink CSI corresponding to the downlink coordinated transmission set to the first AP in the downlink coordinated transmission set. Collaborative transfer to increase data throughput.
  • FIG. 19 shows a structure of an AP 1900 according to another embodiment of the present invention, including at least one processor 1902 (for example, a CPU), at least one network interface 1905 or other communication interface, a memory 1906, and at least one communication bus 1903. To achieve connection communication between these devices.
  • the processor 1902 is configured to execute executable modules, such as computer programs, stored in the memory 1906.
  • the memory 1906 may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory, such as at least one disk memory.
  • the communication connection between the system gateway and at least one other network element is implemented by at least one network interface 1905 (which may be wired or wireless), and may use an Internet, a wide area network, a local network, a metropolitan area network, or the like.
  • the memory 1906 stores a program 19061, and the program 19061 can be executed by the processor 1902.
  • the program includes: The access point AP receives an uplink preamble training sequence sent by the station STA; the AP determines uplink quality information according to the uplink preamble training sequence; the AP sends the uplink quality information to the server, so that the server according to the uplink The road quality information determines the downlink cooperative transmission set.
  • the method further includes: the AP receiving a downlink cooperative transmission set notification message sent by the server to the downlink cooperative transmission set; the AP sending a null data packet NDP to the STA according to the downlink coordinated transmission set notification message, where the NDP carries feedback
  • the type is the indication information of the coordinated transmission, so that the STA measures the downlink channel state information CSI; the AP receives the downlink CSI corresponding to the downlink coordinated transmission set sent by the STA; the AP sends the downlink CSI corresponding to the downlink coordinated transmission set to the
  • the server is configured to enable the server to determine the collaboration information according to the downlink CSI corresponding to the downlink cooperative transmission set; the AP receives the collaboration information sent by the server; and the AP performs downlink cooperative transmission on the STA according to the collaboration information.
  • the uplink preamble training sequence is a new precoding symbol, and the newly added precoding symbol is used for CSI measurement.
  • the uplink quality information includes an uplink quality indicator LQI
  • the AP determines uplink quality information according to the uplink preamble training sequence, where the AP determines, by using an energy detection ED algorithm, an uplink of the uplink preamble training sequence.
  • the received signal strength indicates the RSSI
  • the uplink LQI is determined based on the uplink RSSI.
  • the uplink shield information includes an uplink CSI
  • the AP determines uplink quality information according to the uplink preamble training sequence, including: the AP determines the uplink CSI by using a CSI detection algorithm.
  • the AP receives the downlink CSI corresponding to the downlink coordinated transmission set sent by the STA, where the AP includes: receiving, by the AP, the downlink CSI corresponding to the downlink coordinated transmission set sent by the STA through the carrier sensing/collision avoidance CSMA/CA mechanism. .
  • the embodiment of the present invention determines uplink quality information according to an uplink preamble training sequence sent by the STA, and sends the uplink quality information to the server, so that the server is configured according to the server.
  • the uplink quality information determines the downlink association
  • FIG. 20 shows a structure of a server 2000 according to another embodiment of the present invention, including at least one processor 2002 (for example, a CPU), at least one network interface 2005 or other communication interface, a memory 2006, and at least one communication bus 2003. To achieve connection communication between these devices.
  • the processor 2002 is for executing executable modules, such as computer programs, stored in the memory 2006.
  • the memory 2006 may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory such as at least one disk memory.
  • the communication connection between the system gateway and at least one other network element is implemented by at least one network interface 2005 (which may be wired or wireless), and may use an Internet, a wide area network, a local network, a metropolitan area network, or the like.
  • the memory 2006 stores the program 20061, which can be executed by the processor 2002.
  • the program includes:
  • the server receives the uplink quality information sent by the access point AP, where the uplink quality information is determined by the AP according to the uplink preamble training sequence sent by the station STA; the server determines the downlink cooperative transmission set according to the uplink quality information. .
  • the uplink preamble training sequence is a newly added precoding symbol, and the newly added precoding symbol is used for channel state information CSI measurement.
  • the server determines, according to the uplink quality information, a downlink coordinated transmission set, where: the server determines a downlink coordinated measurement set according to the uplink quality information; and the server determines a downlink coordinated transmission set in the downlink coordinated measurement set.
  • the uplink quality information includes an uplink quality indicator LQI
  • the server determines a downlink coordinated measurement set according to the uplink quality information, where: the server selects an AP with an uplink LQI high as the downlink coordinated measurement set;
  • the determining, by the server, the downlink coordinated transmission set in the downlink coordinated measurement set includes: the server further selecting, in the downlink coordinated measurement set, an AP with an uplink LQI high as the downlink coordinated transmission set.
  • the uplink aggregate information includes uplink CSI; the server is according to the uplink Determining, by the quality information, the downlink coordinated measurement set, the method includes: the server selecting an AP with a high uplink CSI as the downlink coordinated measurement set; and determining, by the server, the downlink coordinated transmission set in the downlink coordinated measurement set, including: the server further performing the downlink coordinated measurement set An AP with a high uplink CSI is selected as the downlink cooperative transmission set.
  • the uplink quality information includes an uplink LQI and an uplink CSI.
  • the server determines, according to the uplink quality information, a downlink coordinated measurement set, where: the server selects an AP with an uplink LQI high as the downlink coordinated measurement set;
  • the determining, by the server, the downlink coordinated transmission set in the downlink coordinated measurement set includes: the server selecting, in the downlink coordinated measurement set, an AP with a high uplink CSI as the downlink coordinated transmission set.
  • the method further includes: sending, by the server, the downlink coordinated transmission set notification message to the downlink coordinated transmission set; the server receiving the downlink CSI corresponding to the downlink coordinated transmission set sent by the first AP in the downlink coordinated transmission set, where The downlink CSI corresponding to the downlink coordinated transmission set is obtained by the STA according to the null data packet NDP sent by each AP in the downlink coordinated transmission set, and is sent to the first AP; the server is configured according to the downlink corresponding to the downlink coordinated transmission set.
  • the CSI determines the collaboration information; the server sends the collaboration information to the downlink coordinated transmission set, so that the downlink coordinated transmission set performs downlink cooperative transmission on the STA according to the collaboration information.
  • the embodiment of the present invention determines the downlink coordinated transmission set by using the uplink quality information determined according to the uplink preamble training sequence sent by the STA, and can implement coordinated transmission of multiple APs. Can improve data throughput.
  • FIG. 21 shows a structure of a STA 2100 according to another embodiment of the present invention, including at least one processor 2102 (for example, a CPU), at least one network interface 2105 or other communication interface, a memory 2106, and at least one communication bus 2103. To achieve connection communication between these devices.
  • the processor 2102 is configured to execute executable modules, such as computer programs, stored in the memory 2106.
  • the memory 2106 may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory such as at least one disk memory.
  • RAM Random Access Memory
  • Via at least one network interface 2105 can be wired or wireless
  • an Internet a wide area network, a local network, a metropolitan area network, or the like can be used.
  • the memory 2106 stores the program 21061, and the program 21061 can be executed by the processor 2102.
  • the program includes:
  • the station STA sends an uplink preamble training sequence to the access point AP, so that the AP determines uplink quality information according to the uplink preamble training sequence; the STA receives an empty data packet NDP sent by each AP in the downlink coordinated transmission set, the NDP Carrying the indication information of the cooperative transmission type, the downlink cooperative transmission set is determined by the server according to the uplink quality information; the STA measures the downlink channel state information CSI according to the NDP; the STA sends the first to the downlink coordinated transmission The AP sends the downlink CSI corresponding to the downlink coordinated transmission set; the STA receives the data that the downlink cooperative transmission set transmits according to the cooperative information downlink cooperation, where the cooperation information is determined by the server according to the downlink CSI corresponding to the downlink coordinated transmission set.
  • the uplink preamble training sequence is a new precoding symbol, and the newly added precoding symbol is used for CSI measurement.
  • the uplink quality information includes an uplink quality indicator LQI, and the uplink LQI is determined by the AP by an energy detection ED algorithm.
  • the uplink quality information includes an uplink CSI, where the uplink CSI is determined by the AP through a CSI detection algorithm.
  • the STA sends the downlink CSI corresponding to the downlink coordinated transmission set to the first AP in the downlink coordinated transmission set, where: the STA sends the downlink to the first AP by using a carrier sense/collision avoidance CSMA/CA mechanism. Collaborate to send the corresponding downlink CSI.
  • the uplink preamble training sequence for determining the uplink quality information is sent to the AP, and the downlink cooperative transmission is sent to the first AP in the downlink coordinated transmission set.
  • the corresponding downlink CSI can be set to achieve coordinated transmission of multiple APs, thereby improving data throughput.
  • the term "and/or" is merely a description of the associated object.
  • the relationship indicates that there can be three relationships.
  • a and / or B can mean: There are three cases of A, A and B, and B alone.
  • the character "/,,” in this article generally indicates that the contextual object is an "or" relationship.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • 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 coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • 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 may be integrated by two or more units. In one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) 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), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

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Abstract

本发明公开了一种用于协作传输的方法、AP、服务器和 STA。该方法包括：AP接收 STA发送的上行前导训练序列；该 AP根据该上行前导训练序列确定上行链路质量信息；该 AP将该上行链路质量信息发送给服务器，以使该服务器根据该上行链路质量信息确定下行协作发送集。本发明实施例的用于协作传输的方法、AP、服务器和 STA，可以实现多个 AP 的协作传输，从而能够提升数据吞吐量。

Description

用于协作传输的方法、 接入点、 服务器和站点 本申请要求于 2013 年 05 月 07 日提交中国专利局、 申请号为 201310163391.4, 发明名称为"用于协作传输的方法、 接入点、 服务器和站 点"的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域 本发明涉及无线通讯技术领域， 具体涉及用于协作传输的方法、 接入 点、 服务器和站点。
背景技术 随着各种移动、 固定、 手持智能终端的普及， 人们对移动数据需求量 在未来会出现爆发性的增长， 导致无论是蜂窝网还是无线局域网 （Wireless Local Area Network, WLAN ) 都不断通过采用新技术、 新方案等手段进行 网络的扩容和升级换代。 由于 WLAN 系统采用非授权 ( Unlicensed ) 频谱 而具有成本低的优势， 尽管 WLAN系统适用于室内或热点地区场景而具有 移动性差及干扰严重的缺点，无线保真（ Wireless Fidelity, WiFi )作为 WLAN 还是被广大运营商、 设备商、 企事业单位作为室内、 热点、 企业、 家庭数 据分流（Offloading ) 的重要手段。
IEEE 802.1 IX 标准采用载波侦听 /冲突避免 （Carrier Sense Multiple Access with Collision Avoidance , CSMA/CA )的接入方式简单地降低了 WiFi 芯片或设备的成本， 但 CSMA/CA不是基于物理层（Physical Layer, PHY ) 而是基于介质访问控制 （Media Access Control, MAC )层的多址方式， 导 致 WiFi没有基于 PHY层的调度机制， 因此， 多个站点 （Station, STA ) 同 时出现业务时会出现碰撞， 导致下行链路 （ Downlink , DL ) 或上行链路 ( Uplink, UL )的数据吞吐量出现瓶颈。 这些瓶颈导致现有的 WiFi不能提 供较高的数据吞吐量。
发明内容 本发明实施例提供了一种用于协作传输的方法、 接入点、 服务器和站 点， 能够提升数据吞吐量。
第一方面， 提供了一种用于协作传输的方法， 包括： 接入点 （Access Point, AP )接收站点 STA发送的上行前导训练序列； 该 AP根据该上行 前导训练序列确定上行链路质量信息；该 AP将该上行链路质量信息发送给 服务器， 以使该服务器根据该上行链路质量信息确定下行协作发送集。
在第一种可能的实现方式中， 该方法还包括： 该 AP接收该服务器发送 给该下行协作发送集的下行协作发送集通知消息；该 AP根据该下行协作发 送集通知消息向该 STA发送空数据包（ Null Data Package , NDP ) , 该 NDP 携带反馈类型为协作传输的指示信息， 以便于该 STA测量下行信道状态信 息 ( Channel State Information, CSI ); 该 AP接收该 STA发送的该下行协作 发送集对应的下行 CSI; 该 AP将该下行协作发送集对应的下行 CSI发送给 该服务器， 以使该服务器根据该下行协作发送集对应的下行 CSI确定协作 信息； 该 AP接收该服务器发送的该协作信息； 该 AP根据该协作信息对该 STA进行下行协作传输。
结合第一方面或第一方面的第一种可能的实现方式， 在第二种可能的 实现方式中， 该上行前导训练序列为新增的预编码符号， 该新增的预编码 符号用于 CSI测量。
结合第一方面或第一方面的第一或二种可能的实现方式， 在第三种可 能的实现方式中，该上行链路质量信息包括上行链路质量指示（ Link Quality Indicator, LQI ); 该 AP根据该上行前导训练序列确定上行链路质量信息， 包括： 该 AP通过能量检测 （Energy Detection, ED ) 算法确定该上行前导 训练序列的上行接收信号强度指示 （Received Signal Strength Indication, RSSI ), 根据该上行 RSSI确定该上行 LQI。
结合第一方面或第一方面的第一或二种可能的实现方式， 在第四种可 能的实现方式中， 该上行链路质量信息包括上行 CSI; 该 AP根据该上行前 导训练序列确定上行链路质量信息， 包括： 该 AP通过 CSI检测算法确定该 上行 CSI。
结合第一方面的笫一种可能的实现方式， 在第五种可能的实现方式中， 该 AP接收该 STA发送的该下行协作发送集对应的下行 CSI, 包括： 该 AP 接收该 STA通过载波侦听 /冲突避免 CSMA/CA机制发送的该下行协作发送 集对应的下行 CSI。
第二方面， 提供了一种用于协作传输的方法， 包括： 服务器接收接入 点 AP发送的上行链路质量信息， 其中， 该上行链路质量信息由该 AP根据 站点 STA发送的上行前导训练序列确定； 该服务器根据该上行链路质量信 息确定下行协作发送集。
在第一种可能的实现方式中， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于信道状态信息 CSI测量。
结合第二方面或第二方面的第一种可能的实现方式， 在第二种可能的 实现方式中， 该服务器根据该上行链路质量信息确定下行协作发送集， 包 括： 该服务器根据该上行链路质量信息确定下行协作测量集； 该服务器在 该下行协作测量集中确定下行协作发送集。
结合第二方面的第二种可能的实现方式， 在第三种可能的实现方式中， 该上行链路质量信息包括上行链路质量指示 LQI; 该服务器根据该上行链 路质量信息确定下行协作测量集， 包括： 该服务器选择上行 LQI 高的 AP 作为该下行协作测量集； 该服务器在该下行协作测量集中确定下行协作发 送集， 包括： 该服务器在该下行协作测量集中进一步选择上行 LQI高的 AP 作为该下行协作发送集。 结合第二方面的第二种可能的实现方式， 在第四种可能的实现方式中， 该上行链路质量信息包括上行 CSI;该服务器根据该上行链路质量信息确定 下行协作测量集， 包括： 该服务器选择上行 CSI高的 AP作为该下行协作测 量集； 该服务器在该下行协作测量集中确定下行协作发送集， 包括： 该服 务器在该下行协作测量集中进一步选择上行 CSI高的 AP作为该下行协作发 送集。
结合第二方面的笫二种可能的实现方式， 在第五种可能的实现方式中， 该上行链路质量信息包括上行 LQI和上行 CSI; 该服务器根据该上行链路 质量信息确定下行协作测量集， 包括： 该服务器选择上行 LQI高的 AP作 为该下行协作测量集； 该服务器在该下行协作测量集中确定下行协作发送 集， 包括： 该服务器在该下行协作测量集中选择上行 CSI高的 AP作为该下 行协作发送集。
结合第二方面或第二方面的第一至五种可能的实现方式中的任一种可 能的实现方式， 在笫六种可能的实现方式中， 该方法还包括： 该服务器向 该下行协作发送集发送下行协作发送集通知消息； 该服务器接收该下行协 作发送集中的第一 AP发送的该下行协作发送集对应的下行 CSI, 其中， 该 下行协作发送集对应的下行 CSI为该 STA根据该下行协作发送集中的每个 AP发送的空数据包 NDP测量得到， 并发送给该第一 AP的； 该服务器根据 该下行协作发送集对应的下行 CSI确定协作信息； 该服务器向该下行协作 发送集发送该协作信息， 以使该下行协作发送集根据该协作信息对该 STA 进行下行协作传输。
第三方面， 提供了一种用于协作传输的方法， 包括： 站点 STA向接入 点 AP发送上行前导训练序列， 以便于该 AP根据该上行前导训练序列确定 上行链路质量信息； 该 STA接收下行协作发送集中的每个 AP发送的空数 据包 NDP, 该 NDP携带反馈类型为协作传输的指示信息， 该下行协作发送 集是服务器根据该上行链路质量信息确定的；该 STA根据该 NDP测量下行 信道状态信息 CSI;该 STA向该下行协作发送集中的第一 AP发送该下行协 作发送集对应的下行 CSI; 该 STA接收该下行协作发送集根据协作信息下 行协作传输的数据， 其中该协作信息是该服务器根据该下行协作发送集对 应的下行 CSI确定的。
在第一种可能的实现方式中， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于 CSI测量。
结合第三方面或第三方面的第一种可能的实现方式， 在第二种可能的 实现方式中， 该上行链路质量信息包括上行链路质量指示 LQI,该上行 LQI 为该 AP通过能量检测 ED算法确定的。
结合第三方面或第三方面的第一种可能的实现方式， 在第三种可能的 实现方式中， 该上行链路质量信息包括上行 CSI , 该上行 CSI为该 AP通过 CSI检测算法确定的。
结合第三方面或第三方面的第一至三种可能的实现方式中的任一种可 能的实现方式， 在第四种可能的实现方式中， 该 STA向该下行协作发送集 中的第一 AP发送该下行协作发送集对应的下行 CSI, 包括： 该 STA通过载 波侦听 /冲突避免 CSMA/CA机制向该第一 AP发送该下行协作发送集对应 的下行 CSI。
第四方面， 提供了一种接入点 AP, 其特征在于， 包括： 接收模块， 用 于接收站点 STA发送的上行前导训练序列； 确定模块， 用于根据该上行前 导训练序列确定上行链路质量信息； 发送模块， 用于将该上行链路质量信 息发送给服务器， 以使该服务器根据该上行链路质量信息确定下行协作发 送集。
在第一种可能的实现方式中， 该接收模块还用于接收该服务器发送给 该下行协作发送集的下行协作发送集通知消息； 该发送模块还用于根据该 下行协作发送集通知消息向该 STA发送空数据包 NDP, 该 NDP携带反馈 类型为协作传输的指示信息， 以便于该 STA测量下行信道状态信息 CSI; 该接收模块还用于接收该 STA发送的该下行协作发送集对应的下行 CSI; 该发送模块还用于将该下行协作发送集对应的下行 CSI发送给该服务器， 以使该服务器根据该下行协作发送集对应的下行 CSI确定协作信息； 该接 收模块还用于接收该服务器发送的该协作信息； 该发送模块还用于根据该 协作信息对该 STA进行下行协作传输。
结合第四方面或第四方面的第一种可能的实现方式， 在第二种可能的 实现方式中， 该上行前导训练序列为新增的预编码符号， 该新增的预编码 符号用于 CSI测量。
结合第四方面或第四方面的第一或二种可能的实现方式， 在第三种可 能的实现方式中， 该上行链路质量信息包括上行链路质量指示 LQI; 该确 定模块具体用于通过能量检测 ED 算法确定该上行前导训练序列的上行接 收信号强度指示 RSSI, 根据该上行 RSSI确定该上行 LQI。
结合第四方面或第四方面的第一或二种可能的实现方式， 在第四种可 能的实现方式中， 该上行链路质量信息包括上行 CSI; 该确定模块具体用于 通过 CSI检测算法确定该上行 CSI。
结合第四方面的第一种可能的实现方式， 在第五种可能的实现方式中， 该接收模块具体用于接收该 STA通过载波侦听 /冲突避免 CSMA/CA机制发 送的该下行协作发送集对应的下行 CSI。
第五方面， 提供了一种服务器， 包括： 接收模块， 用于接收接入点 AP 发送的上行链路质量信息， 其中， 该上行链路质量信息由该 AP 根据站点 STA发送的上行前导训练序列确定； 确定模块， 用于根据该上行链路质量 信息确定下行协作发送集。
在第一种可能的实现方式中， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于信道状态信息 CSI测量。
结合第五面或第五方面的第一种可能的实现方式， 在第二种可能的实 现方式中， 该确定模块包括： 第一确定单元， 用于根据该上行链路质量信 息确定下行协作测量集； 第二确定单元， 用于在该下行协作测量集中确定 下行协作发送集。
结合第五方面的第二种可能的实现方式， 在第三种可能的实现方式中， 该上行链路质量信息包括上行链路质量指示 LQI; 该第一确定单元具体用 于选择上行 LQI高的 AP作为该下行协作测量集； 该第二确定单元具体用 于在该下行协作测量集中进一步选择上行 LQI高的 AP作为该下行协作发 送集。
结合第五方面的第二种可能的实现方式， 在第四种可能的实现方式中， 该上行链路质量信息包括上行 CSI; 该第一确定单元具体用于选择上行 CSI 高的 AP作为该下行协作测量集；该第二确定单元具体用于在该下行协作测 量集中进一步选择上行 CSI高的 AP作为该下行协作发送集。
结合第五方面的第二种可能的实现方式， 在第五种可能的实现方式中， 该上行链路质量信息包括上行 LQI和上行 CSI; 该第一确定单元具体用于 选择上行 LQI高的 AP作为该下行协作测量集； 该第二确定单元具体用于 在该下行协作测量集中选择上行 CSI高的 AP作为该下行协作发送集。
结合第五方面或第五方面的第一至五种可能的实现方式中的任一种可 能的实现方式， 在第六种可能的实现方式中， 该服务器还包括： 发送模块， 用于向该下行协作发送集发送下行协作发送集通知消息； 该接收模块还用 于接收该下行协作发送集中的第一 AP 发送的该下行协作发送集对应的下 行 CSI, 其中， 该下行协作发送集对应的下行 CSI为该 STA根据该下行协 作发送集中的每个 AP发送的空数据包 NDP测量得到，并发送给该第一 AP 的； 该确定模块还用于根据该下行协作发送集对应的下行 CSI确定协作信 息； 该发送模块还用于向该下行协作发送集发送该协作信息， 以使该下行 协作发送集根据该协作信息对该 STA进行下行协作传输。
第六方面， 提供了一种站点 STA, 包括： 发送模块， 用于向接入点 AP 发送上行前导训练序列，以便于该 AP根据该上行前导训练序列确定上行链 路质量信息； 接收模块， 用于接收下行协作发送集中的每个 AP发送的空数 据包 NDP, 该 NDP携带反馈类型为协作传输的指示信息， 该下行协作发送 集是服务器根据该上行链路质量信息确定的； 测量模块， 用于根据该 NDP 测量下行信道状态信息 CSI;该发送模块还用于向该下行协作发送集中的第 一 AP发送该下行协作发送集对应的下行 CSI; 该接收模块还用于接收该下 行协作发送集根据协作信息下行协作传输的数据， 其中该协作信息是该服 务器根据该下行协作发送集对应的下行 CSI确定的。
在第一种可能的实现方式中， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于 CSI测量。
结合第六方面或第六方面的第一种可能的实现方式， 在第二种可能的 实现方式中， 该上行链路质量信息包括上行链路质量指示 LQI,该上行 LQI 为该 AP通过能量检测 ED算法确定的。
结合第六方面或第六方面的第一种可能的实现方式， 在第三种可能的 实现方式中， 该上行链路质量信息包括上行 CSI , 该上行 CSI为该 AP通过 CSI检测算法确定的。
结合第六方面或第六方面的第一至三种可能的实现方式中的任一种可 能的实现方式， 在第四种可能的实现方式中， 该发送模块具体用于通过载 波侦听 /冲突避免 CSMA/CA机制向该第一 AP发送该下行协作发送集对应 的下行 CSI。
基于上述技术方案， 本发明实施例通过根据 STA发送的上行前导训练 序列确定上行链路质量信息， 并将该上行链路质量信息发送给服务器以使 该服务器根据该上行链路质量信息确定下行协作发送集， 可以实现多个 AP 的协作传输， 从而能够提升数据吞吐量。
附图说明 为了更清楚地说明本发明实施例的技术方案， 下面将对本发明实施例 中所需要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅 是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性 劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1是可应用本发明实施例的场景例子的示意图。
图 2是根据本发明实施例的用于协作传输的方法的示意性流程图。 图 3A和图 3B是才艮据本发明实施例的上行前导训练序列的示意图。 图 4是根据本发明另一实施例的上行前导训练序列的示意图。
图 5是根据本发明实施例的确定下行协作发送集的方法的示意图。 图 6是才艮据本发明另一实施例的确定下行协作发送集的方法的示意图。 图 7是才艮据本发明又一实施例的确定下行协作发送集的方法的示意图。 图 8是根据本发明实施例的用于协作传输的方法的另一示意性流程图。 图 9A至图 9C是根据本发明实施例的 SNDP的示意图。
图 10是根据本发明实施例的反馈下行 CSI的方法的示意图。
图 11 是根据本发明另一实施例的用于协作传输的方法的示意性流程 图。
图 12是根据本发明实施例的确定下行协作发送集的方法的示意性流程 图。
图 13是根据本发明另一实施例的用于协作传输的方法的另一示意性流 程图。
图 14 是根据本发明又一实施例的用于协作传输的方法的示意性流程 图。
图 15是根据本发明实施例的用于协作传输的方法的交互示意图。
图 16是根据本发明实施例的 AP的示意性框图。
图 17是根据本发明实施例的服务器的示意性框图。
图 18是根据本发明实施例的 STA的示意性框图。 图 19是根据本发明实施例的 AP的结构示意图。
图 20是根据本发明实施例的服务器的结构示意图。
图 21是根据本发明实施例的 STA的结构示意图。
具体实施方式 下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进 行清楚、 完整地描述， 显然， 所描述的实施例是本发明的一部分实施例， 而不是全部实施例。 基于本发明中的实施例， 本领域普通技术人员在没有 作出创造性劳动的前提下所获得的所有其他实施例， 都应属于本发明保护 的范围。
本发明实施例的技术方案可以应用于各种 WLAN系统。
应理解， 在本发明实施例中， 为了便于描述， AP到 STA的链路称为下 行链路， STA到 AP的链路称为上行链路，其中上行和下行的描述不应对本 发明实施例的保护范围构成限定。
图 1是可应用本发明实施例的场景例子的示意图。图 1的通信系统 100 包括 AP 101 , 服务器 102和 STA 103。 多个 STA 103分布在多个 AP 101的 覆盖之中。 多个 AP 101通过 Backhaul (回传） 以有线或无线的方式连接到 服务器 102。 服务器 （Server ) 也叫接入控制器 （ Access Controller, AC )。 多个 AP 101可以釆用同样的小区 ID ,在这种情况下，多个 AP101对 STA 103 是透明的， 即 STA 103无法区别自己具体受哪个 AP 101或哪几个 AP-101 的服务。 或者， 多个 AP 101也可以采用不同的小区 ID , 本发明实施例对此 并不限定。
图 2示出了根据本发明实施例的用于协作传输的方法 200的示意性流 程图。 图 2的方法由 AP (例如图 1的 AP 101 )执行。 如图 2所示， 该方法 200包括： S210, AP接收 STA发送的上行前导训练序列；
S220, 该 AP根据该上行前导训练序列确定上行链路廣量信息； S230, 该 AP将该上行链路质量信息发送给服务器， 以使该服务器根据 该上行链路质量信息确定下行协作发送集。
在本发明实施例中， 为了实现在 WiFi系统中的下行协作传输， 通过上 行前导训练序列（Preamble )确定上行链路质量信息， 再利用上下行链路的 互易性， 基于上行链路质量信息确定下行协作发送集以进行下行协作传输。 AP首先接收 STA发送的上行前导训练序列，根据该上行前导训练序列确定 上行链路质量信息， 再将该上行链路质量信息发送给服务器。 该服务器根 据该上行链路质量信息确定下行协作发送集。 这样， 可以在 WiFi系统中实 现多个 AP的协作传输， 进而提升数据吞吐量。
因此， 本发明实施例的用于协作传输的方法， 通过根据 STA发送的上 行前导训练序列确定上行链路质量信息， 并将该上行链路质量信息发送给 服务器以使该服务器根据该上行链路质量信息确定下行协作发送集， 可以 实现多个 AP的协作传输， 从而能够提升数据吞吐量。
在 S210中， AP接收 STA发送的上行前导训练序列。
具体而言， STA发送上行前导训练序列给附近的所有 AP, 以便于各 AP确定相应的上行链路质量信息。 AP接收 STA发送的上行前导训练序列， 以获取上行链路质量信息。 该上行前导训练序列可以使用现有标准里的前 导训练序列， 也可以使用新的前导训练序列。
可选地， 该上行前导训练序列为新增的预编码符号， 该新增的预编码 符号用于 CSI测量。 例如， 如图 3A和图 3B所示， 可以在现有帧格式中增 加一个 VVHT-LTF-CSI字段， 该字段采用预编码符号， 作为用于测量上行 链路质量的上行前导训练序列。 可选地， 该 VVHT-LTF-CSI 字段可以在 VVHT-SIG-A 字段之后， 如图 3 A 所示； 该 VVHT-LTF-CSI 字段可以在 VVHT-SIG-A字段之前， 如图 3B所示。 应理解， 该上行前导训练序列也可以为现有标准里的前导训练序列。 例如， 可以利用图 4中的 L-STF字段和 L-LTF字段测量上行链路质量。
在 S220中， AP根据该上行前导训练序列确定上行链路质量信息。
AP检测该上行前导训练序列， 得到上行链路质量信息。
可选地， 该上行链路质量信息包括上行 LQI;
S220包括：
该 AP通过 ED算法确定该上行前导训练序列的上行 RSSI, 根据该上 行 RSSI确定该上行 LQI。
AP接收上行前导训练序列并通过 ED算法检测出上行 RSSI,再将上行 RSSI量化为上行 LQI。
可选地， 该上行链路质量信息包括上行 CSI;
S220包括：
该 AP通过 CSI检测算法确定该上行 CSI。
AP接收上行前导训练序列并通过 CSI检测算法检测出上行 CSI。例如， 在采用图 3A 或图 3B 所示的上行前导训练序列时， AP 通过检测新增 VVHT-LTF-CSI字段的预编码符号得到上行 CSI。
在 S230中， AP将该上行链路质量信息发送给服务器， 以使该服务器 根据该上行链路质量信息确定下行协作发送集。
各 AP将测得的上行链路质量信息， 如上行 LQI和 /或上行 CSI， 发送 给服务器， 由服务器利用上下行链路的互易性， 根据该上行链路质量信息 确定下行协作发送集。
服务器可以先根据该上行链路质量信息确定下行协作测量集， 再在该 下行协作测量集中确定下行协作发送集。
可选地， 在该上行链路质量信息包括上行 LQI时， 该服务器先选择上 行 LQI高的 AP作为该下行协作测量集， 再在该下行协作测量集中进一步 选择上行 LQI高的 AP作为该下行协作发送集。 如图 5所示， 服务器选择上行 LQI最好（如超过门限值 ) 的 4个 AP, 即 A、 B、 C 和 D 4 个 AP。 由于 WiFi 系统是时分双工 （Time Division Duplexing, TDD ) 系统， 下行链路与上行链路存在互易性， 即下行链路质 量和上行链路质量相似， 那么， 上行 LQI最好的 A、 B、 C和 D 4个 AP所 对应的下行 LQI也是最好的， 即 A、 B、 C和 D 4个 AP的下行 CSI也最好。 因此，服务器就把 A、 B、 C和 D 4个 AP确定为下行协作测量集（ Downlink Coordinated Measurement Set, DCMS )。 之所以根据 TDD系统的 DL与 UL 的互易性和 ED检测算法来决定 DCMS， 是因为 WiFi系统大都是室内系统 或低速或中速系统， 信道相对变化比较缓慢， 大尺度、 中尺度、 小尺度衰 落都不是非常严重， 因此， DCMS相对来说变化比较緩慢， 这给 TDD系统 的 DL与 UL的互易性和 ED检测算法的应用提供了现实的场景。
然后， 服务器在下行协作测量集即 A、 B、 C和 D 4个 AP中选择上行 LQI最高的 C和 D两个 AP作为下行协作发送集（Downlink Coordinated Transmission Set, DCTS )。之所以根据 DCMS来决定 DCTS,也是因为 WiFi 系统大都是室内系统或低速或中速系统， 信道相对变化比较緩慢， 大尺度、 中尺度、 小尺度衰落都不是非常严重， 因此， DCTS相对来说变化也不是很 大， 因此， DCMS中肯定有 DCTS的 AP。
可选地， 在该上行链路质量信息包括上行 CSI时， 该服务器先选择上 行 CSI高的 AP作为该下行协作测量集，再在该下行协作测量集中进一步选 择上行 CSI高的 AP作为该下行协作发送集。
如图 6所示， 服务器选择上行 CSI最好 （如超过门限值） 的 4个 AP, 即 、 B、 C和 D 4个 AP。 根据上下行链路的互易性， 把八、 B、 C和 D 4 个 AP确定为下行协作测量集。 然后， 服务器在下行协作测量集即 A、 B、 C和 D 4个 AP中选择上行 CSI最高的 A和 D两个 AP作为下行协作发送 集。
可选地， 在该上行链路质量信息包括上行 LQI和上行 CSI时， 该服务 器先选择上行 LQI高的 AP作为该下行协作测量集， 再在该下行协作测量 集中选择上行 CSI高的 AP作为该下行协作发送集。
如图 7所示， 服务器选择上行 LQI最好（如超过门限值 ) 的 4个 AP, 即八、 B、 C和 D 4个 AP。 根据上下行链路的互易性， 把八、 B、 C和 D 4 个 AP确定为下行协作测量集。 然后， 服务器在下行协作测量集即 A、 B、 C和 D 4个 AP中选择上行 CSI最高的 A和 D两个 AP作为下行协作发送 集。
在本发明实施例中， 如图 8所示， 可选地， 该方法 200还包括： S240 ,该 AP接收该服务器发送给该下行协作发送集的下行协作发送集 通知消息；
S250， 该 AP根据该下行协作发送集通知消息向该 STA发送 NDP , 该 NDP携带反馈类型为协作传输的指示信息， 以便于该 STA测量下行 CSI;
S260 , 该 AP接收该 STA发送的该下行协作发送集对应的下行 CSI; S270,该 AP将该下行协作发送集对应的下行 CSI发送给该服务器， 以 使该服务器根据该下行协作发送集对应的下行 CSI确定协作信息；
S280, 该 AP接收该服务器发送的该协作信息；
S290, 该 AP根据该协作信息对该 STA进行下行协作传输。
服务器在确定了下行协作发送集后， 向下行协作发送集发送通知消息， 将确定的下行协作发送集通知下行协作发送集中的各 AP。 AP接收到该通 知消息， 确定在下行协作发送集中， 于是通知 STA反馈下行 CSI。 该 AP 向 STA发送 NDP, 以便于该 STA测量下行 CSI。 其中， 该 NDP携带反馈 类型为协作传输的指示信息， 也就是说， AP在发送给 STA的 NDP中携带 一个指示信息， 指示反馈类型为协作传输， 在本发明实施例中， 该 NDP称 为 SNDP ( Sounding NDP ), 如图 9A所示。
可选地，如图 9B所示，可以采用 NDP帧格式中的 Sounding Dialog Token 字段中预留的 2个比特（bits )指示反馈类型， 例如， 00代表没有协作， 01 代表有协作， 10继续保留， 11继续保留。
可选地， 如图 9C所示， 也可以扩充 NDP帧格式中的 STA info字段， 将 STA info字段增加为 3个字节（ bytes ), 即将 STA info字段中的 Feedback Type字段扩充为 9个比特。 这样， Feedback Type字段除了可以指示现有的 反馈类型外， 还可以指示新增加的协作反馈类型。
STA通过检测下行协作发送集中的 AP发送的 NDP,测得各 AP对应的 下行 CSI, 得到下行协作发送集对应的下行 CSL 也就是说， 该下行协作发 送集对应的下行 CSI包括该下行协作发送集中的各 AP对应的下行 CSI。 然 后， 该 STA向该下行协作发送集中的一个 AP (表示为第一 AP )发送该下 行协作发送集对应的下行 CSI, 这样， 该 AP接收到该下行协作发送集对应 的下行 CSI。
可选地， S260包括：
该 AP接收该 STA通过 CSMA/CA机制发送的该下行协作发送集对应 的下行 CSI。
也就是说， STA在 CSMA/CA机制中竟争成功时， 在自己的上行链路 上反馈该下行协作发送集对应的下行 CSI,即反馈该下行协作发送集中的各 AP对应的下行 CSI。
如图 10所示， 下行协作发送集中的 C和 D两个 AP都向 STA协作发 送数据， STA测量相应的 DL CSI ( C )和 DL CSI ( D )。 STA上行依旧采用 CSMA/CA的接入机制， STA向 C反馈 DL CSI ( C )和 DL CSI ( D ), 这样， 能够保证 DL CSI ( C )和 DL CSI ( D )都能及时反馈。
AP将接收到的下行协作发送集对应的下行 CSI发送给该服务器。 该服 务器根据该下行协作发送集对应的下行 CSI确定协作信息。 也就是说， 该 服务器进行多个 AP之间的下行 CSI信息的交换， 并进行资源的联合调度， 确定协作信息， 将该协作信息发送给下行协作发送集中的各 AP。
AP接收该服务器发送的该协作信息，根据该协作信息对该 STA进行下 行协作传输。 也就是说， 下行协作发送集中的各 AP接收到服务器发送的协 作信息后， 开始下行协作传输数据给 STA。
因此， 本发明实施例的用于协作传输的方法， 通过发送根据 STA发送 的上行前导训练序列确定的上行链路质量信息给服务器以确定下行协作发 送集， 再利用服务器根据下行协作发送集对应的下行 CSI确定的协作信息 进行下行协作传输， 可以实现多个 AP的协作传输，从而能够提升数据吞吐 量。
以上从 AP的角度详细描述了本发明实施例的用于协作传输的方法，下 面从服务器的角度描述本发明实施例的用于协作传输的方法。
图 11 示出了根据本发明另一实施例的用于协作传输的方法 1100的示 意性流程图。 图 11的方法由服务器 （例如图 1的服务器 102 )执行。 如图 11所示， 该方法 1100包括：
S1110, 服务器接收 AP发送的上行链路质量信息， 其中， 该上行链路 质量信息由该 AP根据 STA发送的上行前导训练序列确定；
S1120, 该服务器根据该上行链路质量信息确定下行协作发送集。 在本发明实施例中， 通过上行前导训练序列确定上行链路质量信息， 再利用上下行链路的互易性， 基于上行链路质量信息确定下行协作发送集 以进行下行协作传输。 AP首先接收 STA发送的上行前导训练序列，根据该 上行前导训练序列确定上行链路质量信息， 再将该上行链路质量信息发送 给服务器。 该服务器接收到该上行链路质量信息后， 根据该上行链路质量 信息确定下行协作发送集。 这样， 可以在 WiFi系统中实现多个 AP的协作 传输， 进而提升数据吞吐量。
因此， 本发明实施例的用于协作传输的方法， 利用根据 STA发送的上 行前导训练序列确定的上行链路质量信息确定下行协作发送集， 可以实现 多个 AP的协作传输， 从而能够提升数据吞吐量。
在本发明实施例中， 可选地， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于 CSI 测量， 如图 3A 和图 3B 所示的 VVHT-LTF-CSI字段。可选地， 该上行前导训练序列也可以为现有标准里的 前导训练序列， 例如， 可以利用图 4中的 L-STF字段和 L-LTF字段测量上 行链路质量。
在本发明实施例中， 如图 12所示， 可选地， S1120包括：
51121 , 该服务器根据该上行链路质量信息确定下行协作测量集；
51122, 该服务器在该下行协作测量集中确定下行协作发送集。
可选地， 该上行链路质量信息包括上行 LQI;
S1121包括：
该服务器选择上行 LQI高的 AP作为该下行协作测量集；
S1122包括：
该服务器在该下行协作测量集中进一步选择上行 LQI高的 AP作为该 下行协作发送集。
如图 5所示， 服务器选择上行 LQI最好（如超过门限值 ) 的 4个 AP, 即 、 B、 C和 D 4个 AP。 根据上下行链路的互易性， 把八、 B、 C和 D 4 个 AP确定为下行协作测量集。 然后， 服务器在下行协作测量集即 A、 B、 C和 D 4个 AP中选择上行 LQI最高的 A和 D两个 AP作为下行协作发送 集。
可选地 , 该上行链路质量信息包括上行 CSI;
S1121包括：
该服务器选择上行 CSI高的 AP作为该下行协作测量集；
S1122包括：
该服务器在该下行协作测量集中进一步选择上行 CSI高的 AP作为该下 行协作发送集。
如图 6所示， 服务器选择上行 CSI最好 （如超过门限值 ) 的 4个 AP, 即 、 B、 C和 D 4个 AP。 根据上下行链路的互易性， 把八、 B、 C和 D 4 个 AP确定为下行协作测量集。 然后， 服务器在下行协作测量集即 A、 B、 C和 D 4个 AP中选择上行 CSI最高的 A和 D两个 AP作为下行协作发送 集。
可选地， 该上行链路质量信息包括上行 LQI和上行 CSI;
S1121包括：
该服务器选择上行 LQI高的 AP作为该下行协作测量集；
S1122包括：
该服务器在该下行协作测量集中选择上行 CSI高的 AP作为该下行协作 发送集。
如图 7所示， 服务器选择上行 LQI最好（如超过门限值 ) 的 4个 AP, 即八、 B、 C和 D 4个 AP。 根据上下行链路的互易性， 把八、 B、 C和 D 4 个 AP确定为下行协作测量集。 然后， 服务器在下行协作测量集即 A、 B、 C和 D 4个 AP中选择上行 CSI最高的 A和 D两个 AP作为下行协作发送 集。
在本发明实施例中， 如图 13所示， 可选地， 该方法 1100还包括： S1130, 该服务器向该下行协作发送集发送下行协作发送集通知消息； S1140, 该服务器接收该下行协作发送集中的第一 AP发送的该下行协 作发送集对应的下行 CSI, 其中， 该下行协作发送集对应的下行 CSI为该 STA根据该下行协作发送集中的每个 AP发送的空数据包 NDP测量得到， 并发送给该第一 AP的；
S1150,该服务器根据该下行协作发送集对应的下行 CSI确定协作信息； S1160, 该服务器向该下行协作发送集发送该协作信息， 以使该下行协 作发送集根据该协作信息对该 STA进行下行协作传输。
服务器在确定了下行协作发送集后， 向下行协作发送集发送通知消息。 AP接收到该通知消息， 确定在下行协作发送集中， 于是通知 STA反馈下行 CSI。 该 AP向 STA发送 NDP, 该 STA测量下行 CSI。 STA通过检测下行 协作发送集中的 AP发送的 NDP, 测得各 AP对应的下行 CSI, 得到下行协 作发送集对应的下行 CSI。 也就是说， 该下行协作发送集对应的下行 CSI 包括该下行协作发送集中的各 AP对应的下行 CSI。然后，该 STA向该下行 协作发送集中的一个 AP (表示为第一 AP )发送该下行协作发送集对应的 下行 CSI。
该第一 AP将接收到的下行协作发送集对应的下行 CSI发送给该服务 器。 该服务器根据该下行协作发送集对应的下行 CSI确定协作信息。 也就 是说， 该服务器进行多个 AP之间的下行 CSI信息的交换， 并进行资源的联 合调度， 确定协作信息。 然后该服务器将该协作信息发送给下行协作发送 集， 以使该下行协作发送集根据该协作信息对该 STA进行下行协作传输。
应理解， 在本发明实施例中， AP侧描述的 AP、 服务器和 STA相互之 间的交互及相关特性、 功能等与服务器侧的描述相应， 为了简洁， 在此不 再赘述。
因此， 本发明实施例的用于协作传输的方法， 利用根据 STA发送的上 行前导训练序列确定的上行链路质量信息确定下行协作发送集， 再根据下 行协作发送集对应的下行 CSI确定进行下行协作传输的协作信息， 可以实 现多个 AP的协作传输， 从而能够提升数据吞吐量。
以上分别从 AP 和服务器的角度详细描述了本发明实施例的用于协作 传输的方法，下面从 STA的角度描述本发明实施例的用于协作传榆的方法。
图 14示出了根据本发明又一实施例的用于协作传输的方法 1400的示 意性流程图。 图 14的方法由 STA (例如图 1的 STA 103 )执行。 如图 14 所示， 该方法 1400包括：
S1410, STA向 AP发送上行前导训练序列， 以便于该 AP根据该上行 前导训练序列确定上行链路质量信息；
S1420,该 STA接收下行协作发送集中的每个 AP发送的 NDP,该 NDP 携带反馈类型为协作传输的指示信息， 该下行协作发送集是服务器根据该 上行链路质量信息确定的；
S1430, 该 STA根据该 NDP测量下行 CSI;
S1440,该 STA向该下行协作发送集中的第一 AP发送该下行协作发送 集对应的下行 CSI;
S1450,该 STA接收该下行协作发送集根据协作信息下行协作传输的数 据， 其中该协作信息是该服务器根据该下行协作发送集对应的下行 CSI确 定的。
在本发明实施例中， 通过上行前导训练序列确定上行链路质量信息， 再利用上下行链路的互易性， 基于上行链路质量信息确定下行协作发送集 以进行下行协作传输。 STA发送上行前导训练序列给 AP, AP根据该上行 前导训练序列确定上行链路质量信息， 再将该上行链路质量信息发送给服 务器， 该服务器根据该上行链路质量信息确定下行协作发送集， 并通知下 行协作发送集中的 AP。 AP接收到通知消息后， 确定在下行协作发送集中， 于是通知 STA反馈下行 CSL 下行协作发送集中的每个 AP向 STA发送 NDP, 其中， 该 NDP携带反馈类型为协作传输的指示信息， 也就是说， AP 在发送给 STA的 NDP中携带一个指示信息， 指示反馈类型为协作传输。在 本发明实施例中， 该 NDP称为 SNDP, 如图 9A所示。
可选地，如图 9B所示，可以采用 NDP帧格式中的 Sounding Dialog Token 字段中预留的 2个比特指示反馈类型。
可选地， 如图 9C所示， 也可以扩充 NDP帧格式中的 STA info字段， 将 STA info字段增加为 3个字节， 即将 STA info字段中的 Feedback Type 字段扩充为 9个比特。 这样， Feedback Type字段除了可以指示现有的反馈 类型外， 还可以指示新增加的协作反馈类型。
STA通过检测下行协作发送集中的 AP发送的 NDP,测得各 AP对应的 下行 CSI, 得到下行协作发送集对应的下行 CSI。 也就是说， 该下行协作发 送集对应的下行 CSI包括该下行协作发送集中的各 AP对应的下行 CSI。 然 后， 该 STA向该下行协作发送集中的一个 AP (表示为第一 AP )发送该下 行协作发送集对应的下行 CSI。
可选地， S1440包括：
该 STA通过 CSMA/CA机制向该第一 AP发送该下行协作发送集对应 的下行 CSI。
也就是说， STA在 CSMA/CA机制中竟争成功时， 在自己的上行链路 上反馈该下行协作发送集对应的下行 CSI,即反馈该下行协作发送集中的各 AP对应的下行 CSI。
AP将接收到的下行协作发送集对应的下行 CSI发送给该服务器。 该服 务器根据该下行协作发送集对应的下行 CSI确定协作信息， 将该协作信息 发送给下行协作发送集。 该下行协作发送集根据该协作信息对该 STA进行 下行协作传输。 该 STA接收该下行协作发送集根据该协作信息下行协作传 输的数据。
可选地， 该上行前导训练序列为新增的预编码符号， 该新增的预编码 符号用于 CSI测量。
可选地，该上行链路质量信息包括上行 LQI,该上行 LQI为该 AP通过 ED算法确定的。
可选地， 该上行链路质量信息包括上行 CSI, 该上行 CSI为该 AP通过 CSI检测算法确定的。
应理解， 在本发明实施例中， AP侧描述的 AP、 服务器和 STA相互之 间的交互及相关特性、 功能等与 STA侧的描述相应， 为了简洁， 在此不再 赘述。
因此， 本发明实施例的用于协作传输的方法， 通过向 AP发送用于确定 上行链路质量信息的上行前导训练序列， 以及向下行协作发送集中的第一 AP发送下行协作发送集对应的下行 CSI, 可以实现多个 AP的协作传输， 从而能够提升数据吞吐量。 下面将结合图 15所示的具体的例子详细描述本发明实施例。 应注意， 这只是为了帮助本领域技术人员更好地理解本发明实施例， 而非限制本发 明实施例的范围。
1501 , STA发送上行前导训练序列给附近的所有 AP。
该上行前导训练序列可以为新增的预编码符号， 如图 3 A和图 3B所示 的 VVHT-LTF-CSI字段， 也可以为现有标准里的前导训练序列， 如图 4中 的 L-STF字段和 L-LTF字段。
1502 , AP根据该上行前导训练序列确定上行链路质量信息。
该上行链路质量信息包括上行 LQI和 /或上行 CSI, AP通过 ED算法确 定上行 LQI, 通过 CSI检测算法确定该上行 CSI。
1503 , AP将该上行链路质量信息发送给服务器。
1504 , 服务器根据该上行链路质量信息确定下行协作测量集。
服务器根据下行链路与上行链路的互易性， 选择上行 LQI或上行 CSI 高的 AP作为下行协作测量集。
1505 , 服务器在该下行协作测量集中确定下行协作发送集。
该服务器再在该下行协作测量集中选择上行 LQI或上行 CSI高的 AP 作为下行协作发送集。
1506, 服务器向下行协作发送集发送下行协作发送集通知消息。
1507, AP通知 STA反馈下行 CSI。
下行协作发送集中的 AP发送下行信令通知 STA反馈下行 CSI。
1508, AP向 STA发送 NDP。
下行协作发送集中的 AP向 STA发送 NDP,该 NDP携带反馈类型为协 作传输的指示信息， 可以采用 NDP帧格式中的 Sounding Dialog Token字段 中预留的 2个比特指示反馈类型， 或者， 也可以采用扩充 NDP帧格式中的 STA info字段的方式指示反馈类型。
1509, STA测量下行 CSI。 STA通过检测下行协作发送集中的 AP发送的 NDP,测得各 AP对应的 下行 CSI, 得到下行协作发送集对应的下行 CSI。
1510, STA向 AP发送下行协作发送集对应的下行 CSI。
该 STA向下行协作发送集中的一个 AP发送该下行协作发送集对应的 下行 CSI, 例如， STA在 CSMA/CA机制中竟争成功时， 在自己的上行链路 上反馈该下行协作发送集对应的下行 CSI。
1511 , AP将该下行协作发送集对应的下行 CSI发送给服务器。
1512, 服务器根据该下行协作发送集对应的下行 CSI确定协作信息。 服务器进行多个 AP之间的下行 CSI信息的交换，并进行资源的联合调 度， 确定协作信息。
1513 , 服务器向 AP发送该协作信息。
服务器将该协作信息发送给下行协作发送集中的各 AP。
1514, AP根据该协作信息对 STA进行下行协作传输。
下行协作发送集中的各 AP接收到服务器发送的协作信息后，下行协作 传输数据给 STA。
因此， 本发明实施例的用于协作传输的方法， 通过 STA发送用于确定 上行链路质量信息的上行前导训练序列给 AP, AP将确定的上行链路质量 信息发送给服务器以确定下行协作发送集， 再利用服务器根据下行协作发 送集对应的下行 CSI确定的协作信息进行下行协作传输， 可以实现多个 AP 的协作传输， 从而能够提升数据吞吐量。
应理解， 在本发明的各种实施例中， 上述各过程的序号的大小并不意 味着执行顺序的先后， 各过程的执行顺序应以其功能和内在逻辑确定， 而 不应对本发明实施例的实施过程构成任何限定。
上文中结合图 1至图 15 , 详细描述了根据本发明实施例的用于协作传 输的方法， 下面将结合图 16至图， 描述根据本发明实施例的 AP、 服务器 和 STA。 图 16示出了根据本发明实施例的 AP 1600的示意性框图。 如图 16所 示， 该 AP 1600包括：
接收模块 1610, 用于接收站点 STA发送的上行前导训练序列； 确定模块 1620,用于根据该上行前导训练序列确定上行链路质量信息； 发送模块 1630, 用于将该上行链路质量信息发送给服务器， 以使该服 务器根据该上行链路质量信息确定下行协作发送集。
本发明实施例的 AP ,通过根据 STA发送的上行前导训练序列确定上行 链路质量信息， 并将该上行链路质量信息发送给服务器以使该服务器根据 该上行链路质量信息确定下行协作发送集， 可以实现多个 AP的协作传输， 从而能够提升数据吞吐量。
在本发明实施例中， 可选地， 该接收模块 1610还用于接收该服务器发 送给该下行协作发送集的下行协作发送集通知消息；
该发送模块 1630还用于根据该下行协作发送集通知消息向该 STA发送 空数据包 NDP, 该 NDP携带反馈类型为协作传输的指示信息， 以便于该 STA测量下行信道状态信息 CSI;
该接收模块 1610还用于接收该 STA发送的该下行协作发送集对应的下 行 CSI;
该发送模块 1630还用于将该下行协作发送集对应的下行 CSI发送给该 服务器， 以使该服务器根据该下行协作发送集对应的下行 CSI确定协作信 息；
该接收模块 1610还用于接收该服务器发送的该协作信息；
该发送模块 1630还用于根据该协作信息对该 STA进行下行协作传输。 在本发明实施例中， 可选地， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于 CSI测量。
在本发明实施例中， 可选地， 该上行链路质量信息包括上行链路质量 指示 LQI; 该确定模块 1620具体用于通过能量检测 ED算法确定该上行前导训练 序列的上行接收信号强度指示 RSSI， 根据该上行 RSSI确定该上行 LQI。
在本发明实施例中， 可选地， 该上行链路质量信息包括上行 CSI; 该确定模块 1620具体用于通过 CSI检测算法确定该上行 CSI。
在本发明实施例中， 可选地， 该接收模块 1610具体用于接收该 STA通 过载波侦听 /冲突避免 CSMA/CA机制发送的该下行协作发送集对应的下行 CSL
根据本发明实施例的 AP 1600可对应于根据本发明实施例的用于协作 传输的方法中的 AP,并且 AP 1600中的各个模块的上述和其它操作和 /或功 能分别为了实现图 1至图 15中的各个方法的相应流程， 为了简洁， 在此不 再赘述。
本发明实施例的 AP,通过发送根据 STA发送的上行前导训练序列确定 的上行链路质量信息给服务器以确定下行协作发送集， 再利用服务器根据 下行协作发送集对应的下行 CSI确定的协作信息进行下行协作传输， 可以 实现多个 AP的协作传输， 从而能够提升数据吞吐量。
图 17示出了根据本发明实施例的服务器 1700的示意性框图。 如图 17 所示， 该服务器 1700包括：
接收模块 1710, 用于接收接入点 AP发送的上行链路盾量信息， 其中， 该上行链路质量信息由该 AP根据站点 STA发送的上行前导训练序列确定； 确定模块 1720, 用于根据该上行链路质量信息确定下行协作发送集。 本发明实施例的服务器， 利用根据 STA发送的上行前导训练序列确定 的上行链路质量信息确定下行协作发送集， 可以实现多个 AP的协作传输， 从而能够提升数据吞吐量。
在本发明实施例中， 可选地， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于信道状态信息 CSI测量。
在本发明实施例中， 可选地， 该确定模块 1720包括： 第一确定单元， 用于根据该上行链路质量信息确定下行协作测量集； 第二确定单元， 用于在该下行协作测量集中确定下行协作发送集。 在本发明实施例中， 可选地， 该上行链路质量信息包括上行链路质量 指示 LQI;
该第一确定单元具体用于选择上行 LQI 高的 AP作为该下行协作测量 集；
该第二确定单元具体用于在该下行协作测量集中进一步选择上行 LQI 高的 AP作为该下行协作发送集。
在本发明实施例中， 可选地， 该上行链路质量信息包括上行 CSI; 该第一确定单元具体用于选择上行 CSI 高的 AP作为该下行协作测量 集；
该第二确定单元具体用于在该下行协作测量集中进一步选择上行 CSI 高的 AP作为该下行协作发送集。
在本发明实施例中， 可选地， 该上行链路质量信息包括上行 LQI和上 行 CSI;
该第一确定单元具体用于选择上行 LQI 高的 AP作为该下行协作测量 集；
该第二确定单元具体用于在该下行协作测量集中选择上行 CSI高的 AP 作为该下行协作发送集。
在本发明实施例中， 如图 17所示， 可选地， 该服务器 1700还包括： 发送模块 1730, 用于向该下行协作发送集发送下行协作发送集通知消 息；
该接收模块 1710还用于接收该下行协作发送集中的第一 AP发送的该 下行协作发送集对应的下行 CSI, 其中， 该下行协作发送集对应的下行 CSI 为该 STA根据该下行协作发送集中的每个 AP发送的空数据包 NDP测量得 到， 并发送给该第一 AP的； 该确定模块 1720还用于根据该下行协作发送集对应的下行 CSI确定协 作信息；
该发送模块 1730还用于向该下行协作发送集发送该协作信息， 以使该 下行协作发送集根据该协作信息对该 STA进行下行协作传输。
根据本发明实施例的服务器 1700可对应于根据本发明实施例的用于协 作传输的方法中的服务器， 并且服务器 1700中的各个模块的上述和其它操 作和 /或功能分别为了实现图 1至图 15中的各个方法的相应流程，为了简洁， 在此不再赘述。
本发明实施例的服务器， 利用根据 STA发送的上行前导训练序列确定 的上行链路质量信息确定下行协作发送集， 再根据下行协作发送集对应的 下行 CSI确定进行下行协作传输的协作信息，可以实现多个 AP的协作传输， 从而能够提升数据吞吐量。
图 18示出了根据本发明实施例的 STA 1800的示意性框图。 如图 18所 示， 该 STA 1800包括：
发送模块 1810, 用于向接入点 AP发送上行前导训练序列， 以便于该
AP根据该上行前导训练序列确定上行链路质量信息；
接收模块 1820, 用于接收下行协作发送集中的每个 AP发送的空数据 包 NDP, 该 NDP携带反馈类型为协作传输的指示信息， 该下行协作发送集 是服务器根据该上行链路质量信息确定的；
测量模块 1830, 用于根据该 NDP测量下行信道状态信息 CSI;
该发送模块 1810还用于向该下行协作发送集中的第一 AP发送该下行 协作发送集对应的下行 CSI;
该接收模块 1820还用于接收该下行协作发送集根据协作信息下行协作 传输的数据， 其中该协作信息是该服务器根据该下行协作发送集对应的下 行 CSI确定的。
在本发明实施例中， 可选地，， 该上行前导训练序列为新增的预编码符 号， 该新增的预编码符号用于 CSI测量。
在本发明实施例中， 可选地， 该上行链路质量信息包括上行链路质量 指示 LQI, 该上行 LQI为该 AP通过能量检测 ED算法确定的。
在本发明实施例中， 可选地， 该上行链路质量信息包括上行 CSI, 该上 行 CSI为该 AP通过 CSI检测算法确定的。
在本发明实施例中， 可选地， 该发送模块 1810具体用于通过载波侦听
/冲突避免 CSMA/CA机制向该第一 AP发送该下行协作发送集对应的下行
CSI。
根据本发明实施例的 STA 1800可对应于根据本发明实施例的用于协作 传输的方法中的 STA, 并且 STA 1800中的各个模块的上述和其它操作和 / 或功能分别为了实现图 1至图 15中的各个方法的相应流程， 为了简洁， 在 此不再赘述。
本发明实施例的 STA,通过向 AP发送用于确定上行链路质量信息的上 行前导训练序列，以及向下行协作发送集中的第一 AP发送下行协作发送集 对应的下行 CSI，可以实现多个 AP的协作传输，从而能够提升数据吞吐量。
图 19示出了本发明另一个实施例提供的 AP 1900的结构， 包括至少一 个处理器 1902 (例如 CPU ), 至少一个网络接口 1905或者其他通信接口， 存储器 1906, 和至少一个通信总线 1903 , 用于实现这些装置之间的连接通 信。 处理器 1902用于执行存储器 1906 中存储的可执行模块， 例如计算机 程序。 存储器 1906可能包含高速随机存取存储器 （RAM: Random Access Memory ), 也可能还包括非不稳 -定的存储器（ non- volatile memory ), 例如至 少一个磁盘存储器。 通过至少一个网络接口 1905 (可以是有线或者无线） 实现该系统网关与至少一个其他网元之间的通信连接， 可以使用互联网， 广域网， 本地网， 城域网等。
在一些实施方式中， 存储器 1906存储了程序 19061 , 程序 19061可以 被处理器 1902执行， 这个程序包括： 接入点 AP接收站点 STA发送的上行前导训练序列；该 AP根据该上行 前导训练序列确定上行链路质量信息；该 AP将该上行链路质量信息发送给 服务器， 以使该服务器根据该上行链路质量信息确定下行协作发送集。
可选地， 还包括： 该 AP接收该服务器发送给该下行协作发送集的下行 协作发送集通知消息； 该 AP根据该下行协作发送集通知消息向该 STA发 送空数据包 NDP, 该 NDP携带反馈类型为协作传输的指示信息， 以便于该 STA测量下行信道状态信息 CSI; 该 AP接收该 STA发送的该下行协作发 送集对应的下行 CSI; 该 AP将该下行协作发送集对应的下行 CSI发送给该 服务器， 以使该服务器根据该下行协作发送集对应的下行 CSI确定协作信 息；该 AP接收该服务器发送的该协作信息；该 AP根据该协作信息对该 STA 进行下行协作传输。
可选地， 该上行前导训练序列为新增的预编码符号， 该新增的预编码 符号用于 CSI测量。
可选地， 该上行链路质量信息包括上行链路质量指示 LQI; 该 AP根据 该上行前导训练序列确定上行链路质量信息， 包括： 该 AP 通过能量检测 ED 算法确定该上行前导训练序列的上行接收信号强度指示 RSSI, 根据该 上行 RSSI确定该上行 LQI。
可选地， 该上行链路盾量信息包括上行 CSI; 该 AP根据该上行前导训 练序列确定上行链路质量信息， 包括： 该 AP通过 CSI检测算法确定该上行 CSI。
可选地， 该 AP接收该 STA发送的该下行协作发送集对应的下行 CSI, 包括： 该 AP接收该 STA通过载波侦听 /冲突避免 CSMA/CA机制发送的该 下行协作发送集对应的下行 CSI。
从本发明实施例提供的以上技术方案可以看出， 本发明实施例通过根 据 STA发送的上行前导训练序列确定上行链路质量信息， 并将该上行链路 质量信息发送给服务器以使该服务器根据该上行链路质量信息确定下行协 作发送集， 可以实现多个 AP的协作传输， 从而能够提升数据吞吐量。 图 20示出了本发明另一个实施例提供的服务器 2000的结构， 包括至 少一个处理器 2002 (例如 CPU ), 至少一个网络接口 2005或者其他通信接 口， 存储器 2006, 和至少一个通信总线 2003 , 用于实现这些装置之间的连 接通信。 处理器 2002用于执行存储器 2006中存储的可执行模块， 例如计 算机程序。 存储器 2006 可能包含高速随机存取存储器 （RAM: Random Access Memory ), 也可能还包括非不稳定的存 4诸器 ( non- volatile memory ), 例如至少一个磁盘存储器。 通过至少一个网络接口 2005 (可以是有线或者 无线） 实现该系统网关与至少一个其他网元之间的通信连接， 可以使用互 联网， 广域网， 本地网， 城域网等。
在一些实施方式中， 存储器 2006存储了程序 20061 , 程序 20061可以 被处理器 2002执行， 这个程序包括：
服务器接收接入点 AP发送的上行链路质量信息， 其中， 该上行链路质 量信息由该 AP根据站点 STA发送的上行前导训练序列确定； 该服务器根 据该上行链路质量信息确定下行协作发送集。
可选地， 该上行前导训练序列为新增的预编码符号， 该新增的预编码 符号用于信道状态信息 CSI测量。
可选地， 该服务器根据该上行链路质量信息确定下行协作发送集， 包 括： 该服务器根据该上行链路质量信息确定下行协作测量集； 该服务器在 该下行协作测量集中确定下行协作发送集。
可选地， 该上行链路质量信息包括上行链路质量指示 LQI; 该服务器 根据该上行链路质量信息确定下行协作测量集， 包括： 该服务器选择上行 LQI高的 AP作为该下行协作测量集；该服务器在该下行协作测量集中确定 下行协作发送集， 包括： 该服务器在该下行协作测量集中进一步选择上行 LQI高的 AP作为该下行协作发送集。
可选地， 该上行链路廣量信息包括上行 CSI; 该服务器根据该上行链路 质量信息确定下行协作测量集， 包括： 该服务器选择上行 CSI高的 AP作为 该下行协作测量集； 该服务器在该下行协作测量集中确定下行协作发送集， 包括：该服务器在该下行协作测量集中进一步选择上行 CSI高的 AP作为该 下行协作发送集。
可选地， 该上行链路质量信息包括上行 LQI和上行 CSI; 该服务器根 据该上行链路质量信息确定下行协作测量集， 包括： 该服务器选择上行 LQI 高的 AP作为该下行协作测量集；该服务器在该下行协作测量集中确定下行 协作发送集， 包括： 该服务器在该下行协作测量集中选择上行 CSI高的 AP 作为该下行协作发送集。
可选地， 还包括： 该服务器向该下行协作发送集发送下行协作发送集 通知消息；该服务器接收该下行协作发送集中的第一 AP发送的该下行协作 发送集对应的下行 CSI,其中，该下行协作发送集对应的下行 CSI为该 STA 根据该下行协作发送集中的每个 AP发送的空数据包 NDP测量得到， 并发 送给该第一 AP的；该服务器根据该下行协作发送集对应的下行 CSI确定协 作信息； 该服务器向该下行协作发送集发送该协作信息， 以使该下行协作 发送集根据该协作信息对该 STA进行下行协作传输。
从本发明实施例提供的以上技术方案可以看出， 本发明实施例利用根 据 STA发送的上行前导训练序列确定的上行链路质量信息确定下行协作发 送集， 可以实现多个 AP的协作传输， 从而能够提升数据吞吐量。
图 21示出了本发明另一个实施例提供的 STA 2100的结构， 包括至少 一个处理器 2102 (例如 CPU ),至少一个网络接口 2105或者其他通信接口， 存储器 2106, 和至少一个通信总线 2103 , 用于实现这些装置之间的连接通 信。 处理器 2102用于执行存储器 2106 中存储的可执行模块， 例如计算机 程序。 存储器 2106可能包含高速随机存取存储器 （RAM: Random Access Memory ), 也可能还包括非不稳定的存储器（ non- volatile memory ), 例如至 少一个磁盘存储器。 通过至少一个网络接口 2105 (可以是有线或者无线） 实现该系统网关与至少一个其他网元之间的通信连接， 可以使用互联网， 广域网， 本地网， 城域网等。
在一些实施方式中， 存储器 2106存储了程序 21061 , 程序 21061可以 被处理器 2102执行， 这个程序包括：
站点 STA向接入点 AP发送上行前导训练序列，以便于该 AP根据该上 行前导训练序列确定上行链路质量信息； 该 STA接收下行协作发送集中的 每个 AP发送的空数据包 NDP, 该 NDP携带反馈类型为协作传输的指示信 息， 该下行协作发送集是服务器根据该上行链路质量信息确定的； 该 STA 根据该 NDP测量下行信道状态信息 CSI; 该 STA向该下行协作发送集中的 第一 AP发送该下行协作发送集对应的下行 CSI;该 STA接收该下行协作发 送集根据协作信息下行协作传输的数据， 其中该协作信息是该服务器根据 该下行协作发送集对应的下行 CSI确定的。
可选地， 该上行前导训练序列为新增的预编码符号， 该新增的预编码 符号用于 CSI测量。
可选地， 该上行链路质量信息包括上行链路质量指示 LQI, 该上行 LQI 为该 AP通过能量检测 ED算法确定的。
可选地， 该上行链路质量信息包括上行 CSI, 该上行 CSI为该 AP通过 CSI检测算法确定的。
可选地， 该 STA向该下行协作发送集中的第一 AP发送该下行协作发 送集对应的下行 CSI, 包括： 该 STA通过载波侦听 /冲突避免 CSMA/CA机 制向该第一 AP发送该下行协作发送集对应的下行 CSI。
从本发明实施例提供的以上技术方案可以看出， 本发明实施例通过向 AP发送用于确定上行链路质量信息的上行前导训练序列， 以及向下行协作 发送集中的第一 AP 发送下行协作发送集对应的下行 CSI, 可以实现多个 AP的协作传输， 从而能够提升数据吞吐量。
应理解， 在本发明实施例中， 术语 "和 /或" 仅仅是一种描述关联对象 的关联关系， 表示可以存在三种关系。 例如， A和 /或 B, 可以表示： 单独 存在 A, 同时存在 A和 B,单独存在 B这三种情况。 另外，本文中字符 "/，，， 一般表示前后关联对象是一种 "或" 的关系。
本领域普通技术人员可以意识到， 结合本文中所公开的实施例描述的 各示例的单元及算法步骤， 能够以电子硬件、 计算机软件或者二者的结合 来实现， 为了清楚地说明硬件和软件的可互换性， 在上述说明中已经按照 功能一般性地描述了各示例的组成及步骤。 这些功能究竟以硬件还是软件 方式来执行， 取决于技术方案的特定应用和设计约束条件。 专业技术人员 可以对每个特定的应用来使用不同方法来实现所描述的功能， 但是这种实 现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到， 为了描述的方便和简洁， 上 述描述的系统、 装置和单元的具体工作过程， 可以参考前述方法实施例中 的对应过程， 在此不再赘述。
在本申请所提供的几个实施例中， 应该理解到， 所揭露的系统、 装置 和方法， 可以通过其它的方式实现。 例如， 以上所描述的装置实施例仅仅 是示意性的， 例如， 所述单元的划分， 仅仅为一种逻辑功能划分， 实际实 现时可以有另外的划分方式， 例如多个单元或组件可以结合或者可以集成 到另一个系统， 或一些特征可以忽略， 或不执行。 另外， 所显示或讨论的 相互之间的耦合或直接耦合或通信连接可以是通过一些接口、 装置或单元 的间接耦合或通信连接， 也可以是电的， 机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的， 作为单元显示的部件可以是或者也可以不是物理单元， 即可以位于一个地 方， 或者也可以分布到多个网络单元上。 可以根据实际的需要选择其中的 部分或者全部单元来实现本发明实施例方案的目的。
另外， 在本发明各个实施例中的各功能单元可以集成在一个处理单元 中， 也可以是各个单元单独物理存在， 也可以是两个或两个以上单元集成 在一个单元中。 上述集成的单元既可以采用硬件的形式实现， 也可以采用 软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销 售或使用时， 可以存储在一个计算机可读取存储介质中。 基于这样的理解， 本发明的技术方案本质上或者说对现有技术做出贡献的部分， 或者该技术 方案的全部或部分可以以软件产品的形式体现出来， 该计算机软件产品存 储在一个存储介质中， 包括若干指令用以使得一台计算机设备（可以是个 人计算机， 服务器， 或者网络设备等） 执行本发明各个实施例所述方法的 全部或部分步骤。 而前述的存储介质包括： U盘、 移动硬盘、 只读存储器 ( ROM, Read-Only Memory ), 随机存取存储器 （RAM, Random Access Memory )、 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局 限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可 轻易想到各种等效的修改或替换， 这些修改或替换都应涵盖在本发明的保 护范围之内。 因此， 本发明的保护范围应以权利要求的保护范围为准。

Claims

权利要求
1. 一种用于协作传输的方法， 其特征在于， 包括：
接入点 AP接收站点 STA发送的上行前导训练序列；
所述 AP根据所述上行前导训练序列确定上行链路廣量信息； 所述 AP将所述上行链路质量信息发送给服务器，以使所述服务器根据 所述上行链路质量信息确定下行协作发送集。
2. 根据权利要求 1所述的方法， 其特征在于， 所述方法还包括： 所述 AP接收所述服务器发送给所述下行协作发送集的下行协作发送 集通知消息；
所述 AP根据所述下行协作发送集通知消息向所述 STA发送空数据包 NDP, 所述 NDP携带反馈类型为协作传输的指示信息， 以便于所述 STA测 量下行信道状态信息 CSI;
所述 AP接收所述 STA发送的所述下行协作发送集对应的下行 CSI; 所述 AP将所述下行协作发送集对应的下行 CSI发送给所述服务器，以 使所述服务器根据所述下行协作发送集对应的下行 CSI确定协作信息； 所述 AP接收所述服务器发送的所述协作信息；
所述 AP根据所述协作信息对所述 STA进行下行协作传输。
3. 根据权利要求 1或 2所述的方法， 其特征在于， 所述上行前导训练 序列为新增的预编码符号， 所述新增的预编码符号用于 CSI测量。
4. 根据权利要求 1至 3中任一项所述的方法， 其特征在于， 所述上行 链路质量信息包括上行链路质量指示 LQI;
所述 AP根据所述上行前导训练序列确定上行链路质量信息， 包括： 所述 AP通过能量检测 ED算法确定所述上行前导训练序列的上行接收 信号强度指示 RSSI, 根据所述上行 RSSI确定所述上行 LQI。
5. 根据权利要求 1至 3中任一项所述的方法， 其特征在于， 所述上行 链路质量信息包括上行 CSI;
所述 AP根据所述上行前导训练序列确定上行链路质量信息， 包括： 所述 AP通过 CSI检测算法确定所述上行 CSI。
6. 根据权利要求 2所述的方法， 其特征在于， 所述 AP接收所述 STA 发送的所述下行协作发送集对应的下行 CSI, 包括：
所述 AP接收所述 STA通过载波侦听 /冲突避免 CSMA/CA机制发送的 所述下行协作发送集对应的下行 CSI。
7. 一种用于协作传输的方法， 其特征在于， 包括：
服务器接收接入点 AP发送的上行链路质量信息， 其中， 所述上行链路 质量信息由所述 AP根据站点 STA发送的上行前导训练序列确定；
所述服务器根据所述上行链路质量信息确定下行协作发送集。
8. 根据权利要求 7所述的方法， 其特征在于， 所述上行前导训练序列 为新增的预编码符号， 所述新增的预编码符号用于信道状态信息 CSI测量。
9. 根据权利要求 7或 8所述的方法， 其特征在于， 所述服务器根据所 述上行链路质量信息确定下行协作发送集， 包括：
所述服务器根据所述上行链路质量信息确定下行协作测量集； 所述服务器在所述下行协作测量集中确定下行协作发送集。
10. 根据权利要求 9所述的方法， 其特征在于， 所述上行链路盾量信 息包括上行链路廣量指示 LQI;
所述服务器根据所述上行链路质量信息确定下行协作测量集， 包括： 所述服务器选择上行 LQI高的 AP作为所述下行协作测量集； 所述服务器在所述下行协作测量集中确定下行协作发送集， 包括： 所述服务器在所述下行协作测量集中进一步选择上行 LQI高的 AP作 为所述下行协作发送集。
11. 根据权利要求 9 所述的方法， 其特征在于， 所述上行链路质量信 息包括上行 CSI; 所述服务器根据所述上行链路质量信息确定下行协作测量集， 包括： 所述服务器选择上行 CSI高的 AP作为所述下行协作测量集； 所述服务器在所述下行协作测量集中确定下行协作发送集， 包括： 所述服务器在所述下行协作测量集中进一步选择上行 CSI高的 AP作为 所述下行协作发送集。
12. 根据权利要求 9所述的方法， 其特征在于， 所述上行链路质量信 息包括上行 LQI和上行 CSI;
所述服务器根据所述上行链路质量信息确定下行协作测量集， 包括： 所述服务器选择上行 LQI高的 AP作为所述下行协作测量集； 所述服务器在所述下行协作测量集中确定下行协作发送集， 包括： 所述服务器在所述下行协作测量集中选择上行 CSI高的 AP作为所述下 行协作发送集。
13. 根据权利要求 7至 12中任一项所述的方法， 其特征在于， 所述方 法还包括：
所述服务器向所述下行协作发送集发送下行协作发送集通知消息； 所述服务器接收所述下行协作发送集中的第一 AP 发送的所述下行协 作发送集对应的下行 CSI,其中， 所述下行协作发送集对应的下行 CSI为所 述 STA根据所述下行协作发送集中的每个 AP发送的空数据包 NDP测量得 到， 并发送给所述第一 AP的；
所述服务器根据所述下行协作发送集对应的下行 CSI确定协作信息； 所述服务器向所述下行协作发送集发送所述协作信息， 以使所述下行 协作发送集根据所述协作信息对所述 STA进行下行协作传输。
14. 一种用于协作传输的方法， 其特征在于， 包括：
站点 STA向接入点 AP发送上行前导训练序列，以便于所述 AP根据所 述上行前导训练序列确定上行链路质量信息；
所述 STA接收下行协作发送集中的每个 AP发送的空数据包 NDP， 所 述 NDP携带反馈类型为协作传输的指示信息， 所述下行协作发送集是服务 器根据所述上行链路质量信息确定的；
所述 STA根据所述 NDP测量下行信道状态信息 CSI;
所述 STA向所述下行协作发送集中的第一 AP发送所述下行协作发送 集对应的下行 CSI;
所述 STA接收所述下行协作发送集根据协作信息下行协作传输的数 据， 其中所述协作信息是所述服务器根据所述下行协作发送集对应的下行 CSI确定的。
15. 根据权利要求 14所述的方法， 其特征在于， 所述上行前导训练序 列为新增的预编码符号， 所述新增的预编码符号用于 CSI测量。
16. 根据权利要求 14或 15所述的方法， 其特征在于， 所述上行链路 质量信息包括上行链路质量指示 LQI,所述上行 LQI为所述 AP通过能量检 测 ED算法确定的。
17. 根据权利要求 14或 15所述的方法， 其特征在于， 所述上行链路 质量信息包括上行 CSI,所述上行 CSI为所述 AP通过 CSI检测算法确定的。
18. 根据权利要求 14至 17中任一项所述的方法， 其特征在于， 所述 STA向所述下行协作发送集中的第一 AP发送所述下行协作发送集对应的 下行 CSI, 包括：
所述 STA通过载波侦听 /冲突避免 CSMA/CA机制向所述第一 AP发送 所述下行协作发送集对应的下行 CSI。
19. 一种接入点 AP, 其特征在于， 包括：
接收模块， 用于接收站点 STA发送的上行前导训练序列；
确定模块， 用于根据所述上行前导训练序列确定上行链路质量信息； 发送模块， 用于将所述上行链路质量信息发送给服务器， 以使所述服 务器根据所述上行链路质量信息确定下行协作发送集。
20. 根据权利要求 19所述的 AP, 其特征在于， 所述接收模块还用于 接收所述服务器发送给所述下行协作发送集的下行协作发送集通知消息； 所述发送模块还用于根据所述下行协作发送集通知消息向所述 STA发 送空数据包 NDP, 所述 NDP携带反馈类型为协作传输的指示信息， 以便于 所述 STA测量下行信道状态信息 CSI;
所述接收模块还用于接收所述 STA发送的所述下行协作发送集对应的 下行 CSI;
所述发送模块还用于将所述下行协作发送集对应的下行 CSI发送给所 述服务器， 以使所述服务器根据所述下行协作发送集对应的下行 CSI确定 协作信息；
所述接收模块还用于接收所述服务器发送的所述协作信息；
所述发送模块还用于根据所述协作信息对所述 STA 进行下行协作传 输。
21. 根据权利要求 19或 20所述的 AP , 其特征在于， 所述上行前导训 练序列为新增的预编码符号， 所述新增的预编码符号用于 CSI测量。
22. 根据权利要求 19至 21中任一项所述的 AP , 其特征在于， 所述上 行链路质量信息包括上行链路质量指示 LQI;
所述确定模块具体用于通过能量检测 ED 算法确定所述上行前导训练 序列的上行接收信号强度指示 RSSI ,根据所述上行 RSSI确定所述上行 LQI。
23. 根据权利要求 19至 21中任一项所述的 AP , 其特征在于， 所述上 行链路质量信息包括上行 CSI;
所述确定模块具体用于通过 CSI检测算法确定所述上行 CSI。
24. 根据权利要求 20所述的 AP， 其特征在于， 所述接收模块具体用 于接收所述 STA通过载波侦听 /冲突避免 CSMA/CA机制发送的所述下行协 作发送集对应的下行 CSI。
25. 一种服务器， 其特征在于， 包括：
接收模块， 用于接收接入点 AP发送的上行链路质量信息， 其中， 所述 上行链路质量信息由所述 AP根据站点 STA发送的上行前导训练序列确定； 确定模块， 用于根据所述上行链路质量信息确定下行协作发送集。
26. 根据权利要求 25所述的服务器， 其特征在于， 所述上行前导训练 序列为新增的预编码符号， 所述新增的预编码符号用于信道状态信息 CSI 测量。
27. 根据权利要求 25或 26所述的服务器， 其特征在于， 所述确定模 块包括：
第一确定单元， 用于根据所述上行链路质量信息确定下行协作测量集； 第二确定单元， 用于在所述下行协作测量集中确定下行协作发送集。
28. 根据权利要求 27所述的服务器， 其特征在于， 所述上行链路质量 信息包括上行链路质量指示 LQI;
所述第一确定单元具体用于选择上行 LQI高的 AP作为所述下行协作 测量集；
所述第二确定单元具体用于在所述下行协作测量集中进一步选择上行 LQI高的 AP作为所述下行协作发送集。
29. 根据权利要求 27所述的服务器， 其特征在于， 所述上行链路质量 信息包括上行 CSI;
所述第一确定单元具体用于选择上行 CSI高的 AP作为所述下行协作测 量集；
所述第二确定单元具体用于在所述下行协作测量集中进一步选择上行 CSI高的 AP作为所述下行协作发送集。
30. 根据权利要求 27所述的服务器， 其特征在于， 所述上行链路质量 信息包括上行 LQI和上行 CSI;
所述第一确定单元具体用于选择上行 LQI高的 AP作为所述下行协作 测量集；
所述第二确定单元具体用于在所述下行协作测量集中选择上行 CSI 高 的 AP作为所述下行协作发送集。
31. 根据权利要求 25至 30中任一项所述的服务器， 其特征在于， 所 述服务器还包括：
发送模块， 用于向所述下行协作发送集发送下行协作发送集通知消息； 所述接收模块还用于接收所述下行协作发送集中的第一 AP 发送的所 述下行协作发送集对应的下行 CSI,其中， 所述下行协作发送集对应的下行
CSI为所述 STA根据所述下行协作发送集中的每个 AP发送的空数据包 NDP 测量得到， 并发送给所述第一 AP的；
所述确定模块还用于根据所述下行协作发送集对应的下行 CSI确定协 作信息；
所述发送模块还用于向所述下行协作发送集发送所述协作信息， 以使 所述下行协作发送集根据所述协作信息对所述 STA进行下行协作传输。
32. 一种站点 STA, 其特征在于， 包括：
发送模块 , 用于向接入点 AP发送上行前导训练序列， 以便于所述 AP 根据所述上行前导训练序列确定上行链路质量信息；
接收模块， 用于接收下行协作发送集中的每个 AP 发送的空数据包 NDP, 所述 NDP携带反馈类型为协作传输的指示信息， 所述下行协作发送 集是服务器根据所述上行链路质量信息确定的；
测量模块， 用于根据所述 NDP测量下行信道状态信息 CSI;
所述发送模块还用于向所述下行协作发送集中的第一 AP 发送所述下 行协作发送集对应的下行 CSI;
所述接收模块还用于接收所述下行协作发送集根据协作信息下行协作 传输的数据， 其中所述协作信息是所述服务器根据所述下行协作发送集对 应的下行 CSI确定的。
33. 根据权利要求 32所述的 STA, 其特征在于， 所述上行前导训练序 列为新增的预编码符号， 所述新增的预编码符号用于 CSI测量。
34. 根据权利要求 32或 33所述的 STA, 其特征在于， 所述上行链路 质量信息包括上行链路质量指示 LQI ,所述上行 LQI为所述 AP通过能量检 测 ED算法确定的。
35. 根据权利要求 32或 33所述的 STA, 其特征在于， 所述上行链路 质量信息包括上行 CSI,所述上行 CSI为所述 AP通过 CSI检测算法确定的。
36. 根据权利要求 32至 35 中任一项所述的 STA, 其特征在于， 所述 发送模块具体用于通过载波侦听 /冲突避免 CSMA/CA机制向所述第一 AP 发送所述下行协作发送集对应的下行 CSI。
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US20160080124A1 (en) 2016-03-17
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