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WO2015081495A1 - Procédé de communication de multidiffusion à ondes millimétriques, procédé de calcul de formation de faisceaux de multidiffusion et dispositif associé - Google Patents

Procédé de communication de multidiffusion à ondes millimétriques, procédé de calcul de formation de faisceaux de multidiffusion et dispositif associé Download PDF

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Publication number
WO2015081495A1
WO2015081495A1 PCT/CN2013/088431 CN2013088431W WO2015081495A1 WO 2015081495 A1 WO2015081495 A1 WO 2015081495A1 CN 2013088431 W CN2013088431 W CN 2013088431W WO 2015081495 A1 WO2015081495 A1 WO 2015081495A1
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WO
WIPO (PCT)
Prior art keywords
pcp
multicast
sta
awv
pbss
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
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PCT/CN2013/088431
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English (en)
Chinese (zh)
Inventor
冯薇
金德鹏
陈佳民
李德建
刘培
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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.)
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Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2013/088431 priority Critical patent/WO2015081495A1/fr
Priority to CN201380003326.3A priority patent/CN105191362A/zh
Publication of WO2015081495A1 publication Critical patent/WO2015081495A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

Definitions

  • Millimeter wave multicast communication method multicast beamforming calculation method and device
  • Embodiments of the present invention relate to communication technologies, and in particular, to a millimeter wave multicast communication method, a multicast beamforming calculation method and apparatus. Background technique
  • 60 GHz millimeter wave is widely used in indoor high-definition data stream transmission due to its large bandwidth, flexibility, and gigabit rate, and its small wavelength facilitates system miniaturization.
  • 60 GHz millimeter wave communication in order to compensate for the loss and attenuation, 60 GHz millimeter wave communication generally needs to use beamforming algorithm to obtain sufficient gain.
  • PBSS Personal Basic Service Set
  • PCP PBSS Network Center Control Node
  • STA User Station
  • LTE/EMBMS Long Term Evolution/Enhanced Multimedia Broadcast Multicast Service
  • Embodiments of the present invention provide a millimeter wave multicast communication method, a multicast beamforming calculation method, and a device, to enhance beam directivity, reduce interference between different users, and implement multicast communication between a PCP and multiple STAs.
  • an embodiment of the present invention provides a subscriber station STA, including:
  • a sending module configured to send a PBSS multicast service request to the personal basic service set PBSS network center control node PCP, where the PBSS multicast service request is used to request the PCP to allow the first STA to send multicast to at least two second STAs Data
  • a receiving module configured to receive a PBSS multicast service response sent by the PCP;
  • the sending module is further configured to send the multicast data to the at least two second STAs.
  • the sending module is specifically configured to: directly send the multicast data to the at least two second STAs; or, to the at least two by using the PCP The second STA transmits the multicast data.
  • the sending module is further configured to:
  • an embodiment of the present invention provides a personal basic service set PBSS network center control node PCP, including:
  • a receiving module configured to receive a PBSS multicast service request sent by the first user station STA, where the PBSS multicast service request is used to request the PCP to allow the first STA to send multicast data to at least two second STAs;
  • a sending module configured to send, by the PCP, a PBSS multicast service response to the first STA, to enable the first STA to send the multicast data to the at least two second STAs.
  • the sending module is further configured to forward the received multicast data sent by the first STA to the at least two second STAs.
  • the receiving module is further configured to receive a PBSS multicast service suspension request sent by the first STA, to Suspending the first STA from transmitting the multiple data to the at least two second STAs.
  • the sending module is further configured to send a PBSS multicast service notification message to the at least two second STAs, and send the multicast to the at least two second STAs. data.
  • an embodiment of the present invention provides a personal basic service set PBSS network center control node PCP, including:
  • the calculating module is specifically configured to continuously send, by using the first unicast sending AWV, the Nr sending training TRN-T fields to the STA, so that the STA is configured according to the TRN.
  • -T field obtains a first receiving vector; using a unit matrix IM as a second receiving matrix, obtaining a third receiving vector according to the received receiving training TRN-R field continuously transmitted by the STA, and obtaining the first single Broadcasting the AWV update to the third receiving vector, normalizing the updated element of the first unicast sending AWV, and transmitting the AWV as the third unicast; adding one to the value of the iteration number, if The third unicast transmission AWV is used as the unicast transmission AWV on the link between the PCP and the STA.
  • the product of the main path channel response value of the TRN-R field and the TRN-R corresponding element is used as the 'th element of the third receiving vector.
  • the calculating module is specifically configured to obtain the first multicast sending AWV w by using the first formula;
  • the processing module is specifically configured to obtain a second multicast sending AWV v by using a second formula, where the second formula is For: V + (1 ) ,
  • ⁇ is the unicast transmission AWV corresponding to the minimum received signal power user.
  • an embodiment of the present invention provides a user station STA, including: a calculation module, configured to calculate a unicast receiving antenna weight vector AWV on the link between the STA and the personal basic service set PBSS network center control node PCP;
  • a receiving module configured to receive the AWV by using the unicast receiving AWV, receive the multicast beam sent by the PCP based on the first multicast sending AWV, record the received signal power, and feed back the received signal power to the PCP, to cause the PCP to update the first multicast to send an AWV.
  • the calculating module is specifically configured to use the unit matrix as the first receiving matrix, and according to the received Nr transmission training TRN-T fields continuously sent by the PCP Obtaining a first receiving vector, and updating the second receiving vector to the first receiving vector, normalizing the elements of the second receiving vector, and continuously transmitting Nt to the PCP as the second unicast transmitting AWV Receiving a training TRN-R field, so that the PCP obtains a third receiving vector according to the TRN-R field; after the number of iterations reaches a preset iteration number value, sending the second unicast AWV as the PCP and the The unicast on the link between the STAs receives the AWV.
  • the product of the main path channel response value of the TRN-T field and the corresponding element of the TRN-T is taken as the first element of the first received vector.
  • an embodiment of the present invention provides a millimeter wave multicast communication method, including: a first user station STA sends a PBSS multicast service request to a personal basic service set PBSS network center control node PCP, where the PBSS multicast service request is used Requesting, by the PCP, the first STA to send multicast data to at least two second STAs;
  • the first STA sends the multicast data to the at least two second STAs.
  • the sending, by the first STA, the multicast data to the at least two second STAs includes:
  • the first STA directly sends the multicast data to the at least two second STAs; or the first STA sends the multicast data to the at least two second STAs by using the PCP.
  • the first STA sends the multicast data to the at least two second STAs After that, it also includes:
  • the first STA sends a PBSS multicast service suspension request to the PCP to suspend transmission of the multicast data to the at least two second STAs.
  • an embodiment of the present invention provides a millimeter wave multicast communication method, including: a personal basic service set PBSS network center control node PCP receives a PBSS multicast service request sent by a first user station STA, and the PBSS multicast service request Used to request the PCP to allow the first STA to send multicast data to at least two second STAs;
  • the PCP sends a PBSS multicast service response to the first STA, so that the first STA sends the multicast data to the at least two second STAs.
  • the method further includes:
  • the PCP forwards the received multicast data sent by the first STA to the at least two second STAs.
  • the method further includes:
  • the PCP receives a PBSS multicast service suspension request sent by the first STA to stop the first STA from transmitting the multiple data to the at least two second STAs.
  • the method further includes:
  • the PCP sends a PBSS multicast service notification message to the at least two second STAs; the PCP sends multicast data to the at least two second STAs.
  • an embodiment of the present invention provides a method for calculating a multicast beamforming, including: calculating at least two links on a link between a personal basic service set PBSS network center control node PCP and at least two user station STAs.
  • Performing weighted summation on the at least two unicast transmission AWVs performing element normalization, obtaining a first multicast transmission AWV of the PCP, and transmitting a beam to at least two of the STAs; receiving the at least two The received signal power of the at least two STAs fed back by the STAs; determining the minimum received signal power of the received signal powers of the at least two STAs, and updating the first according to the principle of increasing the minimum received signal power
  • the AWV is multicast transmitted, and the updated element of the first multicast transmission AWV is normalized and then sent as the second multicast AWV.
  • the calculating, at least two unicast transmission AWVs on the link between the PCP and the at least two STAs includes: The PCP continuously transmits Nr transmission training TRN-T fields to the STA by using the first unicast transmission AWV, so that the STA obtains a first reception vector according to the TRN-T field; the PCP uses the unit matrix as the first a receiving matrix, obtaining a third receiving vector according to the received M receiving training TRN-R fields continuously sent by the STA, and updating the unicast sending AWV to the third receiving vector, and updating the After the element of the first unicast transmission AWV is normalized, the AWV is sent as the third unicast;
  • the PCP determines that the number of iterations is equal to the preset number of iterations, transmitting the third unicast AWV as the link on the link between the PCP and the STA. Send AWV unicast.
  • the obtaining, by the TRN-R field that is continuously sent by the STA, the third receiving vector includes:
  • a third possible implementation manner after the weighting and summing the at least two unicast sending AWVs, performing element normalization Obtaining the first multicast transmission AWV of the PCP, including:
  • the first multicast transmission AWV w is obtained by using the first formula; wherein, the first formula is:
  • the first multicast sending AWV is updated according to the principle of increasing the minimum received signal power, and the updated The element of the first multicast transmission AWV is normalized and then sent as the second multicast AWV, including:
  • ⁇ is the unicast transmission AWV corresponding to the minimum received signal power user.
  • an embodiment of the present invention provides a method for calculating a beamforming of a multicast, including: Calculating a unicast receiving antenna weight vector AWV on the link between the subscriber station STA and the personal basic service set PBSS network center control node PCP;
  • the calculating, by the unicast receiving AWV on the link between the STA and the PCP includes:
  • the STA uses the unit array 1 Nr as the first receiving matrix, obtains a first receiving vector according to the received Nr transmission training TRN-T fields continuously sent by the PCP, and updates the second receiving vector to the first a receiving vector, normalizing the elements of the second receiving vector, and continuously transmitting Nt receiving training TRN-R fields to the PCP as a second unicast transmitting AWV; so that the PCP is based on the TRN-
  • the R field obtains a third receiving vector;
  • the obtaining, by the received, the Nr TRN-T fields that are continuously sent by the PCP, the first receiving vector including:
  • the product of the received main channel response value of the (1, 2, ..., Nr) TRN-T field and the corresponding element of the TRN-T is used as the first receiving vector Elements.
  • the millimeter wave multicast communication method, the multicast beamforming calculation method and device provided by the embodiment of the present invention, the sending module and the receiving module are set in the STA, wherein the sending module is configured to send a PBSS multicast service request to the PCP, where The PBSS multicast service request is used to request the PCP to allow the first STA to send multicast data to the at least two second STAs; the receiving module is configured to receive the PBSS multicast service response sent by the PCP; And transmitting the multicast data to the at least two second STAs, implementing multicast communication between the PCP and the multiple STAs; and enhancing beamforming by simultaneously beamforming the transmitting end and the receiving end Directionality, reducing interference between different users.
  • Embodiment 1 is a schematic structural diagram of Embodiment 1 of a STA according to the present invention.
  • Embodiment 1 of a PCP according to the present invention is a schematic structural view of Embodiment 1 of a PCP according to the present invention.
  • FIG. 3 is a schematic structural diagram of a second embodiment of a PCP according to the present invention.
  • Embodiment 2 of a STA according to the present invention is a schematic structural diagram of Embodiment 2 of a STA according to the present invention.
  • FIG. 5 is a flowchart of Embodiment 1 of a millimeter wave multicast communication method according to the present invention.
  • Embodiment 6 is a flowchart of Embodiment 2 of a millimeter wave multicast communication method according to the present invention.
  • Embodiment 7 is a flowchart of Embodiment 1 of a method for calculating a beamforming of a multicast according to the present invention
  • Embodiment 8 is a flowchart of Embodiment 2 of a method for calculating a beamforming of a multicast according to the present invention
  • FIG. 9a is a beamforming direction diagram in a unicast case of a multicast beamforming calculation method according to the present invention.
  • FIG. 9b is a beamforming direction diagram in a unicast case of a multicast beamforming calculation method according to the present invention.
  • Broadcast beamforming calculation method a beamforming pattern of a multicast transmission beam;
  • FIG. 10 is a schematic diagram of throughput comparison of different user numbers in the multi-beam beamforming calculation method of the present invention. detailed description
  • FIG. 1 is a schematic structural diagram of Embodiment 1 of a STA according to the present invention.
  • the STA 10 provided in this embodiment may specifically include a sending module 11 and a receiving module 12:
  • the sending module 11 can be configured to send a PBSS multicast service request to the PCP, where the PBSS The multicast service request is used to request the PCP to allow the first STA to send multicast data to the at least two second STAs; the receiving module 12 may be configured to receive the PBSS multicast service response sent by the PCP; the sending module 11 further The multicast data may be sent to the at least two second STAs.
  • a new media access control (MAC) layer of the personal basic service set-multicast service (Personal Basic) is defined in the PBSS multicast service request.
  • Service Set-Multicast Service abbreviated as: PBSS-MS
  • the PBSS-MS request element includes an element identifier (Element ID), a length, and a PBSS-MS description table.
  • Element ID element identifier
  • PBSS-MS description table Specifically, the PBSS- The definition of the MS description table field is shown in Table 1:
  • Request Type If the request type (Request Type) is 0, it indicates that the request is for PBSS multicast service. When the Request Type value is 1, it indicates that the request to abort the PBSS multicast service; the meaning of other values of the Request Type is reserved.
  • PBSS-MS Mode When the value is 0, it indicates that the STA sends multicast data directly to other STAs.
  • PBSS-MS Mode 1, it indicates that the STA sends multicast data to other STAs through the PCP.
  • PBSS - When the value of MS Mode is 2, it means that the PCP sends multicast data directly to other STAs.
  • MS Mode When the value of MS Mode is 2, it means that the PCP sends multicast data directly to other STAs.
  • the meaning of other values of PBSS-MS Mode is reserved.
  • the STA receiving the multicast data does not need to return the response information during the PBSS multicast service.
  • the reliability is low, but the data throughput is large;
  • the ACK Mode value is At 1 o'clock, during the PBSS multicast service, the STA receiving the multicast data needs to return the response information according to the polling mode to confirm the reception of the multicast data, otherwise the retransmission is high, but the reliability is high but the data throughput is small; The meaning of the value is retained.
  • the sending module 11 sends a PBSS multicast service request to the PCP, where the Request Type takes a value of 0, and if the PBSS-MS Mode takes a value of 0, the sending module 11 may directly go to the at least two Two STAs send the multicast data; if PBSS-MS The mode of the mode is 1.
  • the sending module 11 can send the multicast data to the at least two second STAs by using the PCP. This embodiment does not limit the multicast data.
  • the sending module 11 may also send a PBSS multicast service suspension request to the PCP, where the Request Type takes a value of 1, to suspend sending to the at least two second STAs.
  • the multicast data may be directly suspended by the PCP due to poor link conditions or large interference.
  • the STA of this embodiment is configured to send a PBSS multicast service request to the PCP by setting a sending module and a receiving module, where the PBSS multicast service request is used to request the PCP to allow the first STA to at least two second
  • the STA sends the multicast data;
  • the receiving module is configured to receive the PBSS multicast service response sent by the PCP; and
  • the sending module is further configured to send the multicast data to the at least two second STAs.
  • FIG. 2 is a schematic structural diagram of Embodiment 1 of a PCP according to the present invention.
  • the PCP 20 provided in this embodiment may specifically include a receiving module 21 and a sending module 22:
  • the receiving module 21 may be configured to receive a PBSS multicast service request sent by the first STA, where the PBSS multicast service request is used to request the PCP20 to allow the first STA to send multicast data to at least two second STAs.
  • the sending module 22 may be configured to send, by the PCP20, a PBSS multicast service response to the first STA, to enable the first STA to send the multicast data to the at least two second STAs.
  • a PBSS-MS response element of a new MAC layer is defined in the PBSS multicast service response: the PBSS-MS response element includes an element flag (Element ID), length, and PBSS-MS status table.
  • the PBSS-MS status table field is defined as shown in Table 2:
  • Response Type When the value is 0, it indicates that the PBSS multicast service is allowed. When the Response Type value is 1, it indicates that the PBSS multicast monthly service is rejected. When the Response Type value is 2, it indicates that the PBSS multicast service is aborted. ; The meaning of other values of Response Type Stay.
  • the PBSS-MS Mode field value is copied from the PBSS-MS Mode value in the received PBSS-MS request element.
  • the definition is the same, that is, when the PBSS-MS Mode value is 0, it indicates that the STA directly
  • the STA sends the multicast data to other STAs through the PCP.
  • the PCP sends the multicast data directly to other STAs.
  • the meaning of other values of PBSS-MS Mode is reserved.
  • the ACK Mode field value is copied from the ACK Mode value in the received PBSS-MS request element, and the definition is the same.
  • ACK Mode value When the SP, ACK Mode value is 0, it indicates that the multicast data is received during the PBSS multicast service. The STA does not need to return the response information. In this mode, the reliability is low, but the data throughput is large.
  • the ACK Mode value When the ACK Mode value is 1, it indicates that the STA receiving the multicast data needs to return the response information according to the polling mode during the PBSS multicast service. To confirm that the multicast data is received, otherwise the retransmission is high, but the data throughput is small; the meanings of other values of the ACK Mode are reserved.
  • the Multicast Device Association Identifier field and the Multicast Device Association Identifier field indicate the MAC address and associated identifier of the device directly transmitting the multicast signal.
  • the antenna beam of the multicast receiving device needs to be directed to the transmission.
  • Equipment for broadcasting signals are used to indicate the MAC address and associated identifier of the device directly transmitting the multicast signal.
  • the receiving module 21 may determine whether to allow the PBSS multicast service according to the link status, and if yes, send the PBSS multicast service response to the first STA by using the sending module 22, where The Response Type value is 0. If not allowed, the sending module 22 sends a PBSS multicast service response to the first STA, where the Response Type ear has a value of 1.
  • the PBSS-MS Mode takes a value of 1, and the Response Type of the PBSS multicast service response sent by the sending module 22 to the first STA has a value of 0, SP, allowing more PBSS.
  • the broadcast service after the sending module 22 of the PCP 20 sends the PBSS multicast service response to the first STA, the multicast data sent by the first STA needs to be forwarded to the at least two Second STA.
  • the sending module 22 of the PCP 20 sends a PBSS multicast service notification message to the at least two second STAs; Block 22 transmits multicast data to the at least two second STAs.
  • the receiving module 21 of the PCP 20 may receive a PBSS multicast service suspension request sent by the first STA to stop the first STA from transmitting the multiple data to the at least two second STAs; or The PCP directly suspends the PBSS multicast process due to poor link conditions or large interference.
  • the PCP of this embodiment is configured to receive a PBSS multicast service request sent by the first STA by using a receiving module and a sending module, where the PBSS multicast service request is used to request the PCP to allow the first STA to Transmitting, by the transmitting module, the PCP, to the first STA, a PBSS multicast service response, to enable the first STA to send the the STA to the at least two second STAs. Multicast data.
  • Multicast data Multicast communication between the PCP and a plurality of STAs is realized.
  • FIG. 3 is a schematic structural diagram of Embodiment 2 of a PCP according to the present invention.
  • the PCP 30 provided in this embodiment may specifically include a computing module 31 and a processing module 32:
  • the calculation module 31 may be configured to calculate at least two unicast transmit antenna weight vectors (AWV) on the link between the PCP and the at least two STAs; for the at least two unicasts After the AWV is sent for weighted summation, element normalization is performed to obtain a first multicast transmission AWV of the PCP, and a multicast beam is sent to at least two of the STAs; the processing module 32 may be configured to receive the at least two The received signal power of the at least two STAs fed back by the STAs; determining the minimum received signal power of the received signal powers of the at least two STAs, and updating the first according to the principle of increasing the minimum received signal power
  • the AWV is multicast transmitted, and the updated element of the first multicast transmission AWV is normalized and then sent as the second multicast AWV.
  • the calculating module 31 may be configured to send, by using the first unicast sending AWV, a Nr sending training (Transmit Training, referred to as TRN-T) field to the STA, so that the STA obtains the first according to the TRN-T field.
  • a receiving vector using the unit array I M as the second receiving matrix, obtaining a third receiving vector according to the received Nt Receive Training (TRN-R) field continuously sent by the STA, and
  • the first unicast transmission AWV is updated to the third receiving vector, and the updated element of the first unicast transmission AWV is normalized, and the AWV is sent as the third unicast; the value of the number of iterations is increased by one.
  • the third unicast transmission AWV is sent as the unicast AWV on the link between the PCP and the STA.
  • the processing module 32 can obtain the second multicast transmission AWV by using the second formula.
  • V wherein, the second formula is: V ⁇ + (1 - , where is a constant in the range of 0-1, and ⁇ is the unicast transmission AWV corresponding to the minimum received signal power user.
  • the PCP of this embodiment is configured to calculate a calculation module and a processing module, where the calculation module is configured to calculate at least two unicast transmission AWVs on the link between the PCP and the at least two STAs; and send the at least two unicast transmissions After performing the weighted summation, the AWV performs element normalization to obtain a first multicast transmission AWV of the PCP, and sends a beam to at least two of the STAs; the processing module is configured to receive the feedback of the at least two STAs.
  • the updated element of the first multicast transmission AWV is normalized and then transmitted as the second multicast AWV. Therefore, the beam shaping is performed on the transmitting end, the directivity of the beam is enhanced, the interference between different users is reduced, and the algorithm complexity is low, which can be applied to an actual system.
  • FIG. 4 is a schematic structural diagram of Embodiment 2 of a STA according to the present invention.
  • the STA 40 provided in this embodiment may specifically include a computing module 41 and a receiving module 42:
  • the calculation module 41 may be configured to calculate a unicast receiving AWV on the link between the STA and the PCP.
  • the receiving module 42 may be configured to receive the AWV by using the unicast receiving AWV, and receive the PCP. Transmitting the received signal power based on the multicast signal transmitted by the AWV according to the first multicast, and feeding back the received signal power to the PCP, so that the PCP updates the first multicast transmission AWV.
  • the calculating module 41 may be configured to use the unit matrix as the first receiving matrix, obtain the first receiving vector according to the received Nr TRN-T fields continuously sent by the PCP, and update the second receiving vector.
  • the STA of this embodiment is configured to calculate a unicast receiving AWV on the link between the STA and the PCP by setting a calculating module and a receiving module, and the receiving module is configured to receive the AWV by using the unicast as the eNB.
  • Receiving the AWV receiving the beam sent by the PCP based on the first multicast transmission AWV, recording the received signal power and feeding back the received signal power to the PCP, so that the PCP updates the first multicast transmission AWV . Therefore, beamforming is performed on the receiving end, the directionality of the beam is enhanced, the interference between different users is reduced, and the algorithm complexity is low, which can be applied to an actual system.
  • FIG. 5 is a flowchart of Embodiment 1 of a millimeter wave multicast communication method according to the present invention.
  • the millimeter wave multicast communication method provided by this embodiment may be specifically implemented by a STA.
  • the method provided in this embodiment may specifically include:
  • the first STA sends a PBSS multicast service request to the PCP, where the PBSS multicast service request is used to request the PCP to allow the first STA to send multicast data to the at least two second STAs.
  • a new media access control (MAC) layer of the personal basic service set-multicast service (Personal Basic) is defined in the PBSS multicast service request.
  • Service Set-Multicast Service abbreviated as: PBSS-MS
  • the PBSS-MS request element includes an element identifier (Element ID), a length, and a PBSS-MS description table.
  • Element ID element identifier
  • PBSS-MS description table Specifically, the PBSS- The definition of the MS description table field is shown in Table 1: Table 1 PBSS-MS description table field definition
  • Request Type If the request type (Request Type) is 0, it indicates that the request allows PBSS multicast service. When the Request Type value is 1, it indicates that the request is to abort the PBSS multicast service; the meaning of other values of the Request Type is reserved.
  • PBSS-MS Mode When the value is 0, it indicates that the STA sends multicast data directly to other STAs.
  • PBSS-MS Mode 1, it indicates that the STA sends multicast data to other STAs through the PCP.
  • PBSS - When the value of MS Mode is 2, it indicates that the PCP sends multicast data directly to other STAs; the meaning of other values of PBSS-MS Mode is reserved.
  • the STA receiving the multicast data does not need to return the response information during the PBSS multicast service.
  • the reliability is low, but the data throughput is large;
  • the ACK Mode value is At 1 o'clock, during the PBSS multicast service, the STA receiving the multicast data needs to return the response information according to the polling mode to confirm the reception of the multicast data, otherwise the retransmission is high, but the reliability is high but the data throughput is small; The meaning of the value is retained.
  • the first STA receives a PBSS multicast service response sent by the PCP. Specifically, the PCP may agree or reject the PBSS multicast service request of the first STA according to the link status.
  • the first STA sends the multicast data to the at least two second STAs.
  • the first STA may directly send the multicast data to the at least two second STAs; or, when the value of the PBSS-MS Mode is At 1 o'clock, the first STA may send the multicast data to the at least two second STAs by using the PCP; this embodiment does not limit this.
  • the first STA may further
  • the PCP sends a PBSS multicast service suspension request to suspend transmission of the multicast data to the at least two second STAs; or the PCP may directly suspend the PBSS due to poor link conditions or large interference. Broadcasting process.
  • the first STA sends a PBSS multicast service request to the PCP, where the PBSS multicast service request is used to request the PCP to allow the first STA to send multicast data to at least two second STAs.
  • the first STA receives a PBSS multicast service response sent by the PCP; the first STA sends the multicast data to the at least two second STAs.
  • multicast communication between the PCP and a plurality of STAs is realized.
  • FIG. 6 is a flowchart of Embodiment 2 of a millimeter wave multicast communication method according to the present invention.
  • the millimeter wave multicast communication method provided in this embodiment may be specifically implemented by a PCP.
  • the method provided in this embodiment may specifically include:
  • the S20K PCP receives a PBSS multicast service request sent by the first STA, where the PBSS multicast service request is used to request the PCP to allow the first STA to send to the at least two second STAs.
  • the PCP sends a PBSS multicast service response to the first STA, so that the first STA sends the multicast data to the at least two second STAs.
  • a PBSS-MS response element of a new MAC layer is defined in the PBSS multicast service response: the PBSS-MS response element includes an element flag (Element ID), length, and PBSS-MS status table.
  • the PBSS-MS status table field is defined as shown in Table 2:
  • Response Type When the value is 0, it indicates that the PBSS multicast service is allowed. When the Response Type value is 1, it indicates that the PBSS multicast monthly service is rejected. When the Response Type value is 2, it indicates that the PBSS multicast service is aborted. ; The meaning of other values of Response Type is reserved.
  • the PBSS-MS Mode (PBSS-MS Mode) field value is copied from the PBSS-MS Mode value in the received PBSS-MS request element, and the definition is the same. That is, when the PBSS-MS Mode value is 0, it indicates that the STA directly Other STAs send multicast data; when the value of PBSS-MS Mode is 1, it indicates that the STA sends multicast data to other STAs through the PCP; PBSS-MS Mode A value of 2 indicates that the PCP sends multicast data directly to other STAs; the meaning of other values in the PBSS-MS Mode is reserved.
  • the ACK Mode field value is copied from the ACK Mode value in the received PBSS-MS request element, and the definition is the same.
  • ACK Mode value When the SP, ACK Mode value is 0, it indicates that the multicast data is received during the PBSS multicast service. The STA does not need to return the response information. In this mode, the reliability is low, but the data throughput is large.
  • the ACK Mode value When the ACK Mode value is 1, it indicates that the STA receiving the multicast data needs to return the response information according to the polling mode during the PBSS multicast service. To confirm that the multicast data is received, otherwise the retransmission is high, but the data throughput is small; the meanings of other values of the ACK Mode are reserved.
  • the Multicast Device Association Identifier field and the Multicast Device Association Identifier field indicate the MAC address and associated identifier of the device directly transmitting the multicast signal.
  • the antenna beam of the multicast receiving device needs to be directed to the transmission.
  • Equipment for broadcasting signals are used to indicate the MAC address and associated identifier of the device directly transmitting the multicast signal.
  • Optional Subelements are available for future expansion as needed.
  • the PBSS-MS Mode is set to 1
  • the received multicast data sent by the first STA is also needed. Forwarding to the at least two second STAs.
  • the PCP sends a PBSS multicast service notification message to the at least two second STAs; and sends the multicast data to the at least two second STAs.
  • the PCP may receive a PBSS multicast service suspension request sent by the first STA to stop the first STA from transmitting the multiple data to the at least two second STAs; or, the PCP The PBSS multicast process is directly aborted due to poor link conditions or large interference.
  • the PBSS multicast service request sent by the first STA is received by the PCP, where the PBSS multicast service request is used to request the PCP to allow the first STA to send multicast to at least two second STAs.
  • the PCP sends a PBSS multicast service response to the first STA, to cause the first STA to send the multicast data to the at least two second STAs.
  • the millimeter wave multicast communication method provided in this embodiment has three application scenarios.
  • the first application scenario is that the source STA directly sends multicast data to at least two destination STAs; The source STA sends the multicast data to the at least two destination STAs through the PCP.
  • the third application scenario is that the PCP directly sends the multicast data to the at least two destination STAs.
  • the source STA sends a PBSS multicast service request to the PCP
  • the PBSS multicast service request is used to request the PCP to allow the first STA to send multicast data to at least two second STAs.
  • the PBSS-MS request element in the PBSS multicast service request the PBSS-MS Mode takes a value of 0, and the Request Type takes a value of 0.
  • the PCP agrees or rejects the PBSS multicast service request of the source STA according to the link status. If the PCP rejects the PBSS multicast service request, the Response Type takes a value of 1 in the PBSS-MS response element in the PBSS multicast service response; if the PCP agrees to the PBSS multicast service request, the PBSS in the PBSS multicast service response In the MS response element, the Response Type takes a value of 0.
  • the source STA begins to perform the PBSS multicast service, i.e., transmits multicast data to at least two destination STAs.
  • the source STA may send a PBSS multicast service abort request to the PCP, and the SP, the Request Type takes a value of 1; or the PCP may also have a bad link or a large interference. The reason is to directly suspend the PBSS multicast process.
  • the source STA sends a PBSS multicast service request to the PCP
  • the PBSS multicast service request is used to request the PCP to allow the first STA to send multicast data to the at least two second STAs.
  • the PBSS-MS request element in the PBSS multicast service request the PBSS-MS Mode takes a value of 1
  • the Request Type takes a value of 0.
  • the PCP agrees or rejects the PBSS multicast service request of the source STA according to the link status. If the PCP rejects the PBSS multicast service request, the Response Type takes a value of 1 in the PBSS-MS response element in the PBSS multicast service response; if the PCP agrees to the PBSS multicast service request, the PBSS in the PBSS multicast service response In the MS response element, the Response Type takes a value of 0.
  • the source STA If the PCP agrees to the PBSS multicast service request of the source STA, the source STA starts to perform the PBSS multicast service through the PCP, and the SP, the source STA sends the multicast data to the PCP, and the PCP forwards the multicast data to the at least two destination STAs.
  • the source STA may send a PBSS multicast service abort request to the PCP, and the SP, the Request Type takes a value of 1; or the PCP may also have a bad link or a large interference. The reason is to directly suspend the PBSS multicast process.
  • the PCP sends a PBSS multicast service notification message to the at least two destination STAs, where the PBSS-MS Mode takes a value of 2, and the PCP directly sends the multicast data to the at least two destination STAs. .
  • FIG. 7 is a flowchart of Embodiment 1 of a method for calculating a beamforming of a multicast according to the present invention.
  • the multicast beamforming calculation method provided in this embodiment may be specifically implemented by a PCP, and the method provided in this embodiment may specifically include:
  • S301 Calculate at least two unicast transmission AWVs on the link between the PCP and the at least two STAs.
  • calculating at least two unicast transmission AWVs on the link between the PCP and the at least two STAs may include:
  • the PCP continuously transmits Nr TRN-T fields to the STA by using the first unicast transmission AWV; so that the STA obtains the first reception vector according to the TRN-T field.
  • the STA After obtaining the first receiving vector, the STA updates the second receiving vector to the first receiving vector, and normalizes the elements of the second receiving vector, and sends the AWV as the second unicast to the PCP. Transmitting a TRN-R field, where the initial second receiving vector is the first receiving vector; the PCP uses the unit matrix I M as the second receiving matrix, according to the received TRNs continuously sent by the STA The -R field obtains a third receiving vector, and updates the first unicast sending AWV to the third receiving vector, and normalizes the updated element of the first unicast sending AWV, as a third Send AWV unicast.
  • the third unicast sends the AWV as the link between the PCP and the STA.
  • the unicast sends the AWV; if the PCP adds the value of the number of iterations, and determines that the number of iterations is not equal to the preset iteration number, the process is repeated until the number of iterations is equal to the preset iteration number.
  • S302 Perform weighted summation on the at least two unicast transmission AWVs, perform element normalization, obtain a first multicast transmission AWV of the PCP, and send a multicast beam to at least two of the STAs.
  • the second multicast transmission AWV V can be obtained by using the second formula; wherein, the second formula is: V + (I - ⁇ ) V , where y is a constant in the range of 0-1, The unicast transmission AWV corresponding to the minimum received signal power user; where is a constant in the range of 0-1, and ⁇ is the unicast transmission AWV corresponding to the minimum received signal power user.
  • At least two unicast transmission AWVs on the link between the PCP and the at least two STAs are obtained by calculation; after the weighted summation of the at least two unicast transmission AWVs, the element is returned.
  • a first multicast transmission AWV of the PCP and transmitting a multicast beam to at least two of the STAs; receiving received signal power of the at least two STAs fed back by the at least two STAs; Transmitting a minimum received signal power among the received signal powers of the at least two STAs, and updating the first multicast transmission AWV according to the principle of increasing the minimum received signal power, and transmitting the updated first multicast to the AWV
  • the elements are normalized and sent as a second multicast AWV. Therefore, the beam shaping is performed on the transmitting end, the directionality of the beam is enhanced, the interference between different users is reduced, and the algorithm complexity is low, which can be applied to an actual system.
  • FIG. 8 is a flowchart of Embodiment 2 of a method for calculating a beamforming of a multicast according to the present invention.
  • the method for calculating a multicast beamforming method in this embodiment may be specifically performed by a STA.
  • the method provided in this embodiment may specifically include:
  • the STA may use the unit matrix as the first receiving matrix, obtain the first receiving vector according to the received Nr TRN-T fields continuously sent by the PCP, and update the second receiving vector to Transmitting, by the first receiving vector, an element of the second receiving vector, as a second unicast sending AWV, continuously sending a TRN-R field to the PCP, so that the PCP is based on the TRN-
  • the R field gets the third receive vector.
  • the PCP updates the first unicast sending AWV to the third receiving vector, and normalizes the updated element of the first unicast sending AWV, The third unicast sends AWV.
  • the PCP adds the value of the number of iterations, and determines that the number of iterations is equal to the preset number of iterations, the PCP sends the third unicast to the AWV, and the second The broadcast AWV is the unicast receiving AWV on the link between the PCP and the STA; if the PCP increases the value of the iteration number by one, it is determined that the number of iterations is not equal to the preset iteration number value, The above process is repeated until the number of iterations is equal to the preset iteration number value.
  • the STA may be the product of the received primary channel response value of the (1, 2, ..., Nr) TRN-T field and the corresponding element of the TRN-T.
  • a first received vector is obtained.
  • the unicast receiving AWV on the link between the STA and the PCP is obtained through calculation; the unicast receiving AWV is used as the multicast receiving AWV, and the receiving the PCP is sent according to the first multicast sending AWV.
  • a multicast beam recording received signal power and feeding back the received signal power to the PCP to cause the PCP to update the first multicast transmission AWV. Therefore, the beam shaping is performed on the receiving end, the directionality of the beam is enhanced, the interference between different users is reduced, and the algorithm complexity is low, which can be applied to an actual system.
  • the multicast beamforming calculation method provided by the embodiment of the present invention can be applied to a PCP as a transmitting end, and any STA as a receiving end, and can also be applied to one STA as a transmitting end, and other STAs and PCPs as receiving.
  • PCP and STAs there are 1 PCP and STAs in the multicast communication network PBSS.
  • the PCP and all STAs use a uniform linear antenna array with half-wavelength spacing.
  • the number of antenna elements used by the PCP is Nt
  • the number of antenna elements used by each STA is Nr.
  • the beamforming algorithm for finding the best transmitting AWV and receiving AWV for link k in the unicast case is shown in the first step of the algorithm, wherein the maximum number of iterations is defined as n ⁇ ax , and the initial number of iterations m is 0.
  • the PCP normalizes the vector t as the first unicast transmission AWV, and continuously sends Nr TRN-T fields to the 8-bit input; wherein, the initial vector t can take any size of T xl Non-zero vector;
  • the fourth parameter determines whether it is equal to x . If it is equal, the algorithm ends.
  • the vector of the final sender is recorded as the vector of the receiver is I ⁇ and the element normalization operation is performed; otherwise, the first frame is returned.
  • each array element only adjusts the phase, that is, each element of the antenna weight vector is normalized in the above algorithm.
  • the vector t, the element normalization of the vector r can be expressed as;
  • the unicast transposed vector of the unicast reception AWV of the first STA, H t is the downlink channel matrix of the link between the PCP and the first STA, and H 2 is the transmit signal power.
  • the STA uses the received AWV obtained in the unicast case as the multicast receiving AWV, and the beamforming algorithm for finding the multicast AWV is shown in the second step of the algorithm.
  • the PCP normalizes the vector vector w as the first multicast transmission AWV, and sends a beam to all STAs;
  • the second, the STA uses U/t as the multicast receiving AWV, receives the beam transmitted by the PCP based on the first multicast transmission AWV, records the received signal power, and feeds the received signal power to the PCP;
  • the PCP determines a minimum received signal power user number in the received signal power, and normalizes the updated element of the first multicast transmission AWV according to the principle of increasing the minimum received signal power.
  • Two multicasts send AWV Specifically, the second multicast can be used to send the second multicast to send AWVv:
  • ⁇ is the minimum received signal power corresponding to the user Unicast transmission AWV; where, is a constant in the range of 0-1, ⁇ is the minimum received signal power user unicast transmission AWV, number of iterations / plus 1 ( / / + 1 ) ⁇ '
  • judge / is equal to / TO «, if equal, the algorithm ends, record the final sender's vector is V; otherwise, return the first ⁇ .
  • the above operation makes the final multicast transmission vector approach the user vector with small received power, and tries to ensure that the minimum signal to noise ratio (SNR) value of all user links is maximized.
  • SNR signal to noise ratio
  • the PCP uses the transmission vector V as the multicast transmission AWV
  • the first user STA uses the reception vector as the multicast reception AWV.
  • the initial vector t is selected as the MX 1 scale of the Line Of Sight (LOS ) channel matrix
  • H ae t (e t ) e r ( 0 r )
  • ⁇ is the channel attenuation coefficient
  • e is the transmitted directional van der stage vector
  • e ( ) receives the directional van der stage vector represents the angle between the transmitting antenna array and the physical link, and the receiving antenna array and physics The angle of the link.
  • the channel matrix H is generated such that in the case of unicast, the transmit beam between the PCP and the first STA obtained by beamforming is directed at 60° and the receive beam is directed at 67.5°, as shown in Figure 9a.
  • the channel matrix H 2 is generated such that in the case of unicast, the transmit beam between the PCP and the second STA obtained by beamforming is directed at 120° and the receive beam is directed at 90°, as shown in Figure 9b.
  • the multicast transmission beam of the PCP is obtained.
  • the beam is directed to both the 60° and 120° directions.
  • the link attenuation of the directional LOS channel is inversely proportional to the square of the distance
  • the unicast received power of the first link is significantly smaller than the second link, so
  • the corresponding alignment beam of a link in multicast needs to allocate more energy, compensating for energy loss in the link.
  • the final throughput in a unicast scenario is:
  • the final throughput in the multicast scenario is: 2min (C 1 , C
  • S is the amount of data sent by the PCP to each STA
  • d is the channel capacity of the first link in the case of unicast beamforming
  • C 2 is the channel capacity of the second link in the case of unicast beamforming
  • CV is The channel capacity of the first link in the case of multicast beamforming
  • c 2 ' is the channel capacity of the second link in the case of forming a multicast beam, which can be obtained by the following formula:
  • the superposition algorithm refers to an algorithm that directly uses the superposed vector w as a multicast transmission AWV, and SP, and uses the vector w obtained in the algorithm step 1 as an algorithm for multicast transmission of AWV.
  • the iterative algorithm refers to the iterative part of the above algorithm in the second step, and its initial vector is arbitrary.
  • the upper bound of the multicast SDR in the figure is the upper limit of the throughput obtained by the relaxation rank 1 constraint under the max-min fair beamforming quasi-Ij model in the document Transmit Beamforming for Physical-Layer Multicasting.
  • the calculation complexity of the transmit multicast AWV is obtained by using the beamforming calculation method provided in this embodiment.
  • the complexity of the proposed algorithm is at most (KNt)
  • the quasi-optimal algorithm for transmitter-side multicast beamforming in the above literature is only one water-throttle (randomization) with a complexity of 0 ( 4 ), therefore, the multicast beamforming calculation method of the present embodiment can be better applied to hardware design, and has obvious advantages in practical applications.
  • the multicast beamforming calculation method provided in this embodiment can be performed on the transmitting end and the receiving end. Beamforming enhances the directionality of the beam, reduces interference between different users, and has low algorithm complexity, which can be applied to practical systems.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention.
  • a computer device which may be a personal computer, a server, or a network device, etc.
  • 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

La présente invention concerne un procédé de communication de multidiffusion à ondes millimétriques, un procédé de calcul de formation de faisceaux de multidiffusion et un dispositif associé. Le procédé de communication de multidiffusion à ondes millimétriques consiste à : utiliser un élément de couche MAC (commande d'accès au support physique) pour les communications de multidiffusion qui est appliqué à la demande et à la réponse de services de multidiffusion de l'ensemble PBSS (ensemble de services de base personnels) et prend en charge trois modes de multidiffusion : une station (STA) transmet directement des données de multidiffusion à d'autres STA, une STA transmet des données de multidiffusion à d'autres STA par un point de commande de l'ensemble PBSS (point PCP), et un point PCP transmet directement des données de multidiffusion à d'autres STA, ce qui permet de réaliser par conséquent des communications de multidiffusion entre le point PCP et de multiples stations. L'invention permet d'obtenir un vecteur AWV (vecteur de pondération d'antenne) de transmission de multidiffusion au moyen de l'obtention à l'avance d'un vecteur AWV de transmission d'unidiffusion d'un terminal transmetteur et d'un vecteur AWV de réception d'unidiffusion d'un terminal récepteur; de la définition du vecteur AWV de réception d'unidiffusion en tant que vecteur AWV de réception de multidiffusion; puis de l'utilisation du procédé de sommation pondérée et d'approximation successive. La formation de faisceaux du terminal récepteur et du terminal transmetteur peut améliorer la direction des faisceaux, réduire les interférences entre différents utilisateurs, et est appropriée pour la conception matérielle réelle avec des algorithmes de faible complexité.
PCT/CN2013/088431 2013-12-03 2013-12-03 Procédé de communication de multidiffusion à ondes millimétriques, procédé de calcul de formation de faisceaux de multidiffusion et dispositif associé Ceased WO2015081495A1 (fr)

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