WO2019128192A1 - Channel resource allocation method and device thereof in wireless self-organizing network - Google Patents

Channel resource allocation method and device thereof in wireless self-organizing network Download PDF

Info

Publication number
WO2019128192A1
WO2019128192A1 PCT/CN2018/095515 CN2018095515W WO2019128192A1 WO 2019128192 A1 WO2019128192 A1 WO 2019128192A1 CN 2018095515 W CN2018095515 W CN 2018095515W WO 2019128192 A1 WO2019128192 A1 WO 2019128192A1
Authority
WO
WIPO (PCT)
Prior art keywords
node
frame
retransmission
interference
feedback
Prior art date
Application number
PCT/CN2018/095515
Other languages
French (fr)
Chinese (zh)
Inventor
易辉跃
舒睿俊
徐景
杨旸
王海峰
李强
Original Assignee
上海无线通信研究中心
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海无线通信研究中心 filed Critical 上海无线通信研究中心
Publication of WO2019128192A1 publication Critical patent/WO2019128192A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
    • 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
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to a channel resource allocation method in a wireless ad hoc network, and also relates to a corresponding channel resource allocation device, and belongs to the technical field of wireless communication.
  • the first method is that when the destination node requests retransmission using the NACK information, the neighbor node of the direct link detects the packet exchange, and retransmits the packet when a packet reception error (NACK information is detected) occurs.
  • This method does not consider the cause of packet transmission errors. If the packet reception error is not caused by the poor channel quality of the direct link between the source node and the destination node, but due to other reasons (such as a serious transmission error due to collision or interference), then the direct chain is used at this time. The road can be successfully retransmitted, and there is no need to carry out collaborative retransmission.
  • the neighbor nodes that have received the DATA data packet and the NACK information of the source node automatically participate in the cooperative transmission, and do not consider the node selection problem. Many unnecessary nodes participate in collaborative retransmission and will waste a lot of network resources.
  • the second method is to improve the throughput of the multi-hop network by retransmission of neighboring nodes.
  • the method selects the node closest to the final destination node as the receiving node of the current transmission. Therefore, even if there are multiple nodes capable of cooperative transmission, only one of the nodes is selected for data retransmission. It can be seen that the method only selects one node to transmit the data packet to the destination node, and there is no guarantee that the node can correctly transmit the data packet to the destination node.
  • the third method combines packet retransmission with user collaboration.
  • the target node receives the data packet and requests retransmission through the NACK information
  • the cooperative retransmission node performs self-selection by listening to the packet exchange information, that is, the node that receives the DATA data packet and the NACK information will automatically participate in the retransmission.
  • this method still has the following shortcomings: (1) Neighboring nodes that have received the source node DATA packet and NACK information automatically participate in cooperative transmission. At this time, each cooperative retransmission node does not know the number of nodes participating in cooperative transmission, and the transmission power of each cooperative retransmission node is self-selected.
  • each cooperative retransmission node may send packets with a large power (in fact, does not need such a large power), resulting in unnecessary power consumption increase.
  • the method assumes that the channel state information of the destination node to the cooperative retransmission node is the same as the channel of the cooperative retransmission node to the destination node, without considering the consistency of the radio frequency channel.
  • RF channel inconsistencies are more severe than in cellular networks. Therefore, this method is difficult to achieve coherent combining at the receiving end, and the gain of cooperative retransmission of multiple nodes cannot be guaranteed.
  • the primary technical problem to be solved by the present invention is to provide a channel resource allocation method in a wireless ad hoc network.
  • Another technical problem to be solved by the present invention is to provide a channel resource allocation device in a wireless ad hoc network.
  • a channel resource allocation method in a wireless ad hoc network where a first node allocates a time slot to a second node, and the method includes the following steps:
  • the first node sends a trigger frame to the second node
  • the first node is based on a signal to interference and noise ratio of a channel between the first node and the second node, and the second node having the largest signal to interference and noise ratio is at the earliest
  • the time slot transmits a frame to the first node.
  • the first node sets a signal to interference and noise ratio threshold, and divides a signal to interference and noise ratio of the channel between the first node and the second node into different areas.
  • the second node corresponding to the signal to interference and noise ratio transmits the frame in the earlier time slot.
  • the time slot is divided into a competition phase and a feedback phase.
  • the second node transmits the frame.
  • the second node starts to send the frame.
  • the transmission waiting time is determined by the signal to interference and noise ratio between the second node and the first node.
  • the sending waiting time is:
  • the total interval of the signal to interference and noise ratio is divided into M segments, each segment of the M segments is subdivided into N small segments;
  • the total interval of the signal to interference and noise ratio is divided into M segments, and each segment of the M segments is subdivided into N small segments; the slot mini is the smallest slot unit in the wireless ad hoc network.
  • the trigger frame is used to define a slot structure sent by the second node, including a feedback slot number and a feedback slot specification field.
  • the time slot structure further includes an SINR segmentation specification.
  • the first node first sends a blank data packet advertisement frame and an NDP frame, and then sends the trigger frame.
  • the SINR segment specification field includes a number of segments, a start and end point of each segment, and a number of sub-segments of each segment;
  • the feedback slot specification field includes a specification of a contention window length, a feedback time length, and a feedback wait time.
  • a channel resource allocation device in a wireless ad hoc network where a first node allocates a time slot to a second node, where the device includes a processor and a memory,
  • a computer program is stored in the memory, and together with the processor, causes the device to perform the following operations:
  • the first node sends a trigger frame to the second node
  • the first node is based on a signal to interference and noise ratio of a channel between the first node and the second node, and the second node having the largest signal to interference and noise ratio is at the earliest
  • the time slot transmits a frame to the first node.
  • the present invention is directed to a signal superposition problem caused by a destination node receiving data of a plurality of source nodes simultaneously in a wireless ad hoc network; and a problem that a channel dynamic change between a destination node and a source node is large and does not have channel reciprocity, Effective channel resource competition mechanism.
  • the correct reception probability of data retransmission can be improved, the reliability of data transmission can be improved, and the delay of data transmission can be effectively reduced.
  • FIG. 1 is a schematic diagram of a wireless ad hoc network
  • FIG. 2 is a timing diagram of a channel resource allocation method for a wireless ad hoc network
  • FIG. 3 is a schematic flowchart of a channel resource allocation method for a wireless ad hoc network
  • FIG. 4 is a schematic flow chart of a method for allocating a channel resource by a destination node
  • FIG. 5 is a schematic diagram of a frame structure of a retransmission mode trigger frame according to the present invention.
  • FIG. 6 is a schematic diagram of a frame structure of a feedback request trigger frame
  • FIG. 7 is a schematic structural diagram of a feedback slot in a feedback request trigger frame
  • FIG. 8 is a schematic diagram of a frame structure of a feedback response frame
  • FIG. 9 is a schematic structural diagram of a frame of a retransmission start frame
  • FIG. 10 is a schematic diagram of a frame structure of a cooperative retransmission ACK frame
  • FIG. 11 is a schematic structural diagram of a channel resource allocation device (destination node).
  • the present invention first provides a new intelligent retransmission mechanism for data packet retransmission requirements in a wireless ad hoc network.
  • the destination node analyzes the cause of the error when the data packet is received incorrectly, and adopts a corresponding intelligent retransmission protocol.
  • the smart retransmission protocol provides a new retransmission mode trigger frame (NACK-Retransmission) with a field "retransmission mode" (indicated by one bit: 0 means the source node retransmits, 1 means multiple nodes) Collaboration retransmission).
  • NACK-Retransmission new retransmission mode trigger frame
  • the transmitting node or the neighboring node receives the retransmission mode trigger frame (NACK-Retransmission)
  • the correct transmission method can be automatically selected.
  • the present invention is mainly improved in the following aspects: (1) Designing a new CQI (Channel Quality Indicator) and CSI (Channel Status Information,
  • CQI Channel Quality Indicator
  • CSI Channel Status Information
  • the feedback request of the channel state information triggers the frame and is sent by the destination node.
  • a feedback request trigger frame of CQI and CSI is designed for better channel.
  • the neighboring node with condition feeds back the CQI and CSI information, and the CQI information between it and the source node (the node with the highest CQI between the source node will forward the ACK information to the source node);
  • a new CQI and CSI feedback response frame is designed for neighboring nodes to feed back CQI and CSI information.
  • Cooperative retransmission node selection and retransmission method is designed: when the destination node receives the CQI and CSI of the neighboring node After the feedback response frame, determine the optimal number of cooperative retransmission nodes, select the optimal cooperative retransmission node, and determine the optimal transmission method of each node (including transmission power, transmission weight value, and transmission).
  • each cooperative retransmission node performs cooperative retransmission: when each node receives the cooperative retransmission start frame, according to the retransmission start frame specified in the frame
  • the information is sent according to the specified parameters (including transmit power, transmit weight value, transmit time advance value, etc.).
  • the data packets sent by each node will have the largest diversity and gain at the destination node, greatly improving the detection probability of the data packet;
  • ACK information transmission when the destination node correctly receives the cooperative retransmitted data packet
  • the "retransmit ACK frame" is first sent to a cooperative retransmission node (the node has the best channel condition between the node and the source node, also called a cooperative node), and then the cooperative retransmission node will "retransmit"
  • the ACK frame is forwarded to the source node.
  • the intelligent retransmission mechanism is applicable to both retransmission of data packet segments and retransmission of data packets without segmentation. It improves the correct reception probability of retransmitted packets, thereby improving the overall performance of the wireless ad hoc network.
  • the above intelligent retransmission mechanism can adaptively select the following data retransmission mode according to the reason of the packet reception error: (1) retransmission by the source node; or (2) multi-node cooperative retransmission.
  • the technical improvement measures for the multi-node cooperative retransmission mode include: (1) In order to determine which neighboring nodes can participate in cooperative retransmission, a feedback request trigger frame of CSI and CQI is designed. Moreover, a feedback mechanism based on a signal to interference and noise ratio (SINR) is specified in the feedback request trigger frame, so that those nodes with a higher signal to interference and noise ratio SINR can preferentially feed back CSI and CQI to the destination node.
  • SINR signal to interference and noise ratio
  • the destination node determines the number of nodes participating in the cooperative retransmission according to the feedback information of the node, and determines which nodes participate in the cooperative retransmission. Moreover, the transmit power, the transmit weight value, the transmit time advance (TA) value, and the like of each of the cooperative retransmission nodes participating in the retransmission are determined according to a certain criterion (eg, maximum transmit diversity, maximum ratio transmission, etc.).
  • the cooperative retransmission start frame is designed, and the destination node sends a cooperative retransmission start frame to notify each cooperative retransmission node to retransmit the data packet.
  • Each cooperative retransmission node receives the cooperative retransmission start frame, and retransmits the data packet according to the information indicated in the frame, so that the maximum diversity gain can be obtained at the destination node.
  • the destination node When the destination node correctly receives the retransmitted data packet, it will send an ACK message.
  • the multi-node cooperative retransmission mode can obtain the maximum diversity gain.
  • Step 1 RTS sending
  • an RTS (Request To Send) packet is transmitted to the target node D.
  • the RTS packet includes information such as a sender address, a receiver address, a data transmission time, and an RTS transmission power.
  • Step 2 CTS sends
  • the destination node D When the destination node D receives the RTS packet, it sends a CTS (Clear To Send) packet to the source node S.
  • the CTS packet includes information such as a sender address, a receiver address, a data transmission time, and an RTS transmission power.
  • Step 3 DATA packet transmission
  • the source node S After the source node S receives the CTS packet, it sends a data packet Data to the destination node D.
  • the data packet includes information such as a sender address, a receiver address, a data transmission time, and a data packet transmission power.
  • Step 4 Select retransmission mode based on the cause of the packet error.
  • the destination node D receives the data packet from the source node S. If the destination node D correctly receives the data packet Data, an ACK confirmation message is sent to the source node S. If the destination node D does not correctly receive the data packet sent by the source node S, the above intelligent retransmission mechanism is adopted.
  • channel resources need to be correctly allocated.
  • a channel resource allocation method provided by the present invention will be described with reference to Figs. 2 to 10 .
  • the destination node D determines the cause of the data packet error by using a conventional method, for example, whether it is caused by a channel condition between the source node and the destination node. An error occurred. If not, ie the channel conditions between the source node and the destination node are good enough, the source node retransmission mode is selected (mode 1); if so, the multi-node cooperative retransmission mode is selected (mode 2). Then, a NACK (Retransmission Mode Trigger Frame) is formed according to the selected retransmission mode, and transmitted. Then, the source node or the neighboring node triggers the frame according to the retransmission mode, and adaptively selects the retransmission mode.
  • a NACK Retransmission Mode Trigger Frame
  • the destination node sends the frame in the form of a broadcast, that is, the neighboring node or the source node of the destination node can receive it, but the processing method after receiving it is different.
  • the neighboring node finds that the transmission mode field in the frame is "source node retransmission" (value is 0), it does not participate in cooperative retransmission; if the transmission mode is found as "cooperative retransmission” (Value is 1), then actively participate in the retransmission, and is ready to receive the CSI feedback request trigger frame from the destination node.
  • the channel condition between the source node and the destination node is good, but the reception error of the data frame is caused by, for example, the following factors: 1 the packet reception error is caused due to the low transmission power of the data frame, or 2 when the target node receives the data. A collision has occurred. If it is the reception error of the data frame caused by the cause 1, the destination node may notify the source node to increase the transmission power; if the data frame reception error caused by the cause 2, the destination node triggers the frame by the retransmission mode (NACK-Retransmission) The source node is notified that there is no need to increase the transmission power when retransmitting.
  • NACK-Retransmission retransmission mode
  • the channel conditions between the source node and the destination node are relatively poor.
  • the source node may not be correctly unpacked by multiple transmissions.
  • the source node may not correctly demodulate the NACK information sent by the destination node.
  • the destination node needs to notify the neighboring node in the retransmission mode trigger frame (NACK-Retransmission), and needs to perform cooperative retransmission.
  • Step 5 The destination node generates and sends a retransmission mode trigger frame.
  • the destination node According to the retransmission mode selected in the previous step, the destination node generates a retransmission mode trigger frame.
  • a retransmission mode trigger frame includes not only frame control, duration, sending node address, destination node address, error packet number, and TP (transmit power) adjustment. , P NACK (transmitting power used for transmitting NACK information) and FCS (checking) and other fields, and also include a retransmission mode field.
  • the Retransmission Mode field can be indicated by one bit. This field has two values, one is 0, indicating the source node retransmission mode; one is 1, indicating multi-node cooperative retransmission mode.
  • Step 5A Send a retransmission mode trigger frame (NACK-Retransmission) in which the retransmission mode field is 0 (ie, the source node retransmission mode), and trigger the transmit power adjustment information (TP adjustment ⁇ P) field set in the frame by the retransmission mode.
  • NACK-Retransmission a retransmission mode trigger frame
  • TP adjustment ⁇ P transmit power adjustment information
  • Step 5B Send a retransmission mode trigger frame with a retransmission mode field of 1 (ie, a multi-node cooperative retransmission mode).
  • a retransmission mode field of 1 ie, a multi-node cooperative retransmission mode.
  • NACK-Retransmission a retransmission mode trigger frame
  • the frame can be automatically selected. For the correct retransmission method, proceed to the next step 7.
  • Step 6 Receive retransmission packets from the source node
  • the source node When the retransmission mode field in the retransmission mode trigger frame (NACK-Retransmission) is "source node retransmission", it indicates that the data packet is retransmitted by the source node. At this time, the source node receives the retransmission mode trigger frame (NACK-Retransmission), and adjusts its transmission power according to the “transmit power” specified in the retransmission mode trigger frame (NACK-Retransmission), and retransmits the data packet.
  • NACK-Retransmission retransmission mode trigger frame
  • the destination node receives the data packet retransmitted by the source node, and sends an ACK acknowledgement frame when the data packet is correctly received.
  • the neighboring node listens to the ACK frame, it will discard the DATA packet it listens to.
  • Step 7 Send a feedback request trigger frame
  • NACK-Retransmission When the retransmission mode field in the retransmission mode trigger frame (NACK-Retransmission) is “multi-node cooperative retransmission”, it indicates that the data packet is retransmitted by the source node and cannot be correctly demodulated by the destination node. The node performs cooperative retransmission.
  • the present invention designs a feedback request trigger frame of the CQI and the CSI, so that the neighboring nodes can feedback the channel information for the destination node to select to participate.
  • a new slotted contention channel resource mechanism is designed, so that neighboring nodes with higher CQI/SINR preferentially feed back their CQI and CSI.
  • neighboring nodes with better channel conditions ie, higher CQI/SINR between the destination node
  • CQI/SINR channel conditions
  • CQI information between them and the source node The node with the highest CQI between the source node will forward the ACK information to the source node, and let the destination node preferentially select these neighboring nodes to participate in the cooperative retransmission.
  • the destination node first sends a null data packet announcement frame (NDP-A) and an NDP frame, and then sends a feedback request trigger frame (Trigger). Thereafter, the neighboring node feeds back the CSI and CQI information of the channel through a feedback frame. Finally, the destination node determines the node and the cooperative retransmission method participating in the cooperative retransmission according to the CSI and CQI information fed back by each neighboring node.
  • NDP-A null data packet announcement frame
  • Trigger a feedback request trigger frame
  • the feedback request trigger frame specifies the slot structure of the feedback. Specifically, as shown in FIG. 6, it includes not only fields such as frame control, duration, destination node address and check (FCS), but also "feedback slot number”, “SINR segmentation specification”, and “feedback slot specification”. "Field.
  • the “SINR segmentation specification” field includes information such as the number of segments M, the start and end points of each segment, and the number of sub-segments N of each segment, wherein M, N, and the like are positive integers; the “feedback slot specification” field includes a contention window. Information such as length, feedback time length, and feedback wait time.
  • the present invention defines the correspondence between the CQI interval and the feedback time slot in the CQI-based slotted contention feedback mechanism, as shown in FIG. 7. Since the CQI is obtained based on the SINR and the two have a corresponding relationship, the following description will be made by taking the SINR as an example.
  • each feedback time slot is divided into a competition phase and a feedback phase.
  • the competition phase first the distributed interframe space (DCF interframe space, referred to as DIFS), then the contention window.
  • DIFS distributed interframe space
  • neighboring nodes send feedback information.
  • the specific neighboring node to be fed back begins to send feedback information.
  • the feedback waiting time is determined by the signal to interference and noise ratio SINR between the neighboring node and the destination node.
  • the contention window length can be set to:
  • the feedback waiting time setting of the node is set in order to preferentially feed the CQI and CSI information to the node with high SINR. for:
  • Th i,n (Th i-1 -Th i ); slot mini is the smallest slot unit in a wireless ad hoc network.
  • m 1, 2...M
  • equations (1) and (2) may have other alternative formulas, such as:
  • time slot 1 to time slot X are sorted according to the signal to interference and noise ratio SINR (or CQI information) from small to large (ie, the SINR arrow is reversed in FIG. 7), that is, TH 0 ⁇ TH 1 ... ⁇ TH 5 is satisfied.
  • the SINR of a neighboring node is located in the nth subregion of the mth region, the feedback waiting time can be calculated by the following formula:
  • the neighboring node with the highest signal-to-noise ratio SINR between the destination node and the CQI-based slotted contention feedback mechanism is allocated to slot 0, and the feedback waiting time Twait is the shortest, so it is the earliest transmission feedback. Neighboring nodes.
  • the mechanism for slotting the contention channel resources is not limited to the feedback request trigger frame provided by the present invention. It can also be applied to channel resource allocation in a wireless ad hoc network, so that nodes with good channel conditions preferentially allocate channel resources.
  • the "feedback waiting time" described above may be the "transmission waiting time” of various control frames, and is not limited to feedback waiting. time.
  • Step 8 The destination node receives the feedback response frame.
  • the neighboring node After receiving the feedback request trigger frame, the neighboring node performs synchronization, estimates channel state information CSI and CQI of the neighboring node and the destination node, calculates a time difference between the receiving timing RX and the transmitting timing TX, and determines in which time slot the CQI and CSI are fed back. And feedback waiting time.
  • the CSI and CQI feedback request trigger frame header information is synchronized, and the SINR between the target node and the destination node is estimated according to the frame header information. /CQI and CSI information. This is a conventional method and is not detailed.
  • the neighboring node may trigger the feedback slot structure information (SINR segmentation specification, feedback slot specification, etc.) in the frame according to the feedback request, and determine that the SINR of the neighboring node belongs to Which time slot is shown in Fig. 7 (i.e., CQI and CSI should be fed back in that time slot, and a feedback response frame is transmitted), and the feedback waiting time is also calculated according to formula (2).
  • SINR segmentation specification i.e., CQI and CSI should be fed back in that time slot, and a feedback response frame is transmitted
  • the feedback request of the CSI and CQI transmitted from the destination node triggers the synchronization signal in the frame, and the neighboring node can determine the reception timing STA_RX_t.
  • the transmission timing of the feedback response frame in which the neighboring node transmits the CSI and the CQI to the destination node is STA_TX_t
  • the time difference between the reception timing RX of the neighboring node and the transmission timing TX is calculated as follows:
  • the neighboring node uses the feedback response frame (as shown in FIG. 8) to compare its SINR/CQI and CSI information with the destination node, and The SINR/CQI information between the source nodes is fed back to the destination node.
  • the feedback response frame includes the following information: destination node address, duration, retransmission node address, CQI information and CSI information, CQI information with the source node, and the time difference between the reception timing RX and the transmission timing TX.
  • the retransmission node address is an address of a neighboring node that sends the feedback response frame;
  • the CQI information and the CSI information are CQI and CSI information between the neighboring node and the destination node estimated by the neighboring node that sends the feedback response frame;
  • the CQI information refers to CQI information between the source node and the source node estimated by the neighboring node transmitting the feedback response frame.
  • the destination node receives the feedback response frame from the neighboring node according to the feedback slot structure specified when the feedback request is triggered.
  • Step 9 The destination node selects a cooperative retransmission node, determines a cooperative retransmission method, and forms a retransmission start frame.
  • the destination node determines the node participating in the retransmission, determines the cooperative retransmission method, and the transmission timing advance value of each node.
  • the destination node determines the optimal cooperative retransmission node and the cooperative retransmission method according to the information in the feedback response frame of each node and the size of the retransmission data packet (including the transmission power, transmission weighting coefficient, etc. of each node during retransmission). , as shown in Figure 9.
  • the cooperative retransmission method may employ a cooperative transmission method in a conventional wireless communication system (such as an LTE system), including a maximum ratio transmission method, a maximum space diversity transmission method, and the like.
  • a conventional wireless communication system such as an LTE system
  • CSI channel matrix
  • the transmission weight vector should be:
  • the destination node can determine the transmission weighting coefficient and the transmission power of each cooperative retransmission node according to formula (5). Conventional methods can be employed here.
  • timing advance (TA) value of each cooperative retransmission node when retransmitting a data packet is further described below.
  • the destination node needs to appropriately control the timing advance (TA) value of each cooperative retransmission node in retransmitting the data packet, so that the signals of different STAs reach the destination node at the same time. That is to say, the destination node notifies each cooperative retransmission node of the timing advance (TA) value of each cooperative retransmission node retransmitting the data packet.
  • TA timing advance
  • the destination node After receiving the feedback response frame of CQI and CSI of each node, the destination node estimates the CSI and SINR/CQI between the node and the node according to the preamble of the frame header, and determines the reception timing D_STA_RX_t according to the synchronization signal in the frame header. . Assume that the destination node sends a feedback request trigger frame (Trigger) with a transmission timing of D_STA_TX_t. At this time, the time difference (D_STA_RX_TX time difference) between the reception timing D_STA_RX_t of the destination node and the transmission timing D_STA_TX_t is calculated as:
  • D_STA_RX_TX time difference D_STA_RX_t-D_STA_TX_t (6)
  • the method for determining the transmission timing advance (TA, time advance) value of each cooperative retransmission node retransmission data packet is as follows:
  • TA (STA_RX_t-STA_TX_t)+(D_STA_RX_t-D_STA_TX_t) (7)
  • the source node may not receive the ACK information sent by the destination node because the channel quality between the destination node and the source node is relatively poor. Therefore, the destination node needs to determine the node with the best channel quality between the source node and the node participating in the cooperative retransmission, and the node forwards the ACK information of the destination node to the source node. To achieve this, the destination node may determine the node with the best channel quality between the source node and the SINR/CQI information between the source node and the source node.
  • Step 10 The destination node sends a coordinated retransmission start frame to the selected retransmission node.
  • the target node since the source node may not be able to receive the information in the retransmission mode trigger frame of the target node, the target node needs to determine the cooperative retransmission node with the largest CQI between the source node and the feedback information of each coordinated retransmission node. And in the cooperative retransmission start frame, notifying the node that the source node retransmits the erroneous data packet, and after the correct retransmission ends, the destination node further reports that the source node has correctly performed the data packet. Retransmission.
  • the destination node sends a cooperative retransmission initiation frame to each coordinated retransmission node, as shown in FIG.
  • the fields included in the cooperative retransmission start frame include: source node address, destination node address, retransmission method of cooperative retransmission node TX1, retransmission method of node TX 2, ..., retransmission method of cooperative retransmission node P, ACK forwarding
  • the retransmission method of the cooperative retransmission node includes the following: an address of each coordinated retransmission node, a transmission power, a transmission weighting coefficient, and a transmission timing advance value TA.
  • each coordinated retransmission node is selected by the destination node according to the feedback response frame received by the destination node, and the node that can be reached after 2 hops between the destination node and the source node is used as the cooperative retransmission node, and then the destination node will
  • the addresses of the selected plurality of cooperative retransmission nodes are the addresses of the cooperative retransmission nodes in the cooperative retransmission initiation frame.
  • the destination node selects the earlier received 2-hop node according to the chronological order of the received feedback response frame, and acts as the cooperative retransmission node, and lists the address of the corresponding cooperative retransmission node in the cooperative retransmission start frame.
  • the transmit power and the transmit weighting coefficient of each coordinated retransmission node are calculated by the destination node through the CSI information in the feedback response frame sent by the selected cooperative retransmission node, and are calculated, for example, by using equation (5).
  • the transmission timing advance value TA is calculated by the destination node in accordance with equation (7) in step 9.
  • Step 11 The destination node sends a cooperative retransmission ACK frame after correctly demodulating the retransmitted data packet.
  • each neighboring node After receiving the coordinated retransmission start frame sent by the destination node, each neighboring node determines whether the node participates in the retransmission according to the cooperative retransmission node address in the cooperative retransmission start frame. If the cooperative retransmission start frame contains the address of the node, the node participates in retransmission as a cooperative retransmission node; if the coordinated retransmission start frame does not include the address of the node, the node does not participate in cooperative retransmission.
  • the cooperative retransmission node further retransmits the data packet to the destination node according to the node transmit power, the transmit weighting coefficient, and the transmit timing advance value specified in the cooperative retransmission start frame.
  • the destination node receives the demodulation to obtain a cooperative retransmitted data packet. If the destination node correctly demodulates the cooperatively retransmitted data packet, it transmits the cooperative retransmission ACK frame information to the ACK forwarding node (i.e., the node with the best channel quality selected in step 9).
  • the specific structure of the cooperative retransmission ACK frame is as shown in FIG. 10, including the address, frame control, duration, sending node address, destination node address, error packet number, and FCS of the ACK forwarding node.
  • the address of the ACK forwarding node is the address of the node with the best channel quality selected by the destination node in step 9.
  • the ACK forwarding node receives the cooperative retransmission ACK frame, and then forwards the cooperative retransmission ACK frame to the source node, indicating to the source node that the data packet has been successfully retransmitted to the destination. node.
  • FIG. 11 is a schematic structural diagram of the channel resource allocation device.
  • the channel resource allocation device includes at least a device such as a processor, a memory, and an interface.
  • the computer program is stored in the memory for use with the processor to enable the device to perform the processes of the foregoing steps 1 to 11, thereby implementing the channel resource allocation method provided by the present invention.
  • the retransmission mode trigger frame, the feedback request trigger frame, the feedback response frame, the cooperative retransmission start frame, and the cooperative retransmission ACK frame belong to the control frame, and are performed using a conventional interface used by the control frame in the wireless ad hoc network.
  • retransmitted data frames are transmitted using conventional interfaces used by control frames in a wireless ad hoc network.
  • the present invention brings the following technical performance gains by adding an additional CQI acquisition process (including CQI feedback request trigger frame, CQI feedback response frame, cooperative retransmission start frame, etc.):
  • the node with the best channel condition is selected, and the optimal number of nodes and nodes are determined.
  • an optimal transmission method (including transmission power, transmission weighting factor, and transmission timing advance, etc.) is determined for each node. In this way, it is ensured that the signals retransmitted by each node reach the destination node at the same time, and the maximum combining gain is guaranteed. It can be seen that the invention greatly improves the correct reception probability of data retransmission and improves the reliability of data transmission.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed is a channel resource allocation method and device thereof in a wireless self-organizing network. The method comprises: a first node sends a triggering frame to a second node; in the triggering frame, according to a signal to interference and noise ratio of a channel between the first node and the second node, the second node having the highest signal to interference and noise ratio sends a frame to the first node at the earliest time slot. According to the present invention, the correct receiving probability of data retransmission can be improved, the data transmission reliability can be improved, and the time delay of data transmission is effectively reduced.

Description

无线自组织网络中的信道资源分配方法及其设备Channel resource allocation method and device in wireless self-organizing network 技术领域Technical field
本发明涉及一种无线自组织网络中的信道资源分配方法，同时也涉及相应的信道资源分配设备，属于无线通信技术领域。The invention relates to a channel resource allocation method in a wireless ad hoc network, and also relates to a corresponding channel resource allocation device, and belongs to the technical field of wireless communication.
背景技术Background technique
目前，针对无线自组织网络中的数据包重传需求，相关技术人员提出了协作重传的技术思想，具体有以下三种方法：At present, for the data packet retransmission requirements in the wireless ad hoc network, the relevant technical personnel have proposed the technical idea of cooperative retransmission, specifically the following three methods:
第一种方法是当目的节点使用NACK信息要求重传时，直接链路的邻居节点检测包交换，并且在发生数据包接收错误(检测到NACK信息)时重传该数据包。该方法没有考虑数据包传输错误的原因。如果数据包接收错误不是由于源节点与目的节点之间直接链路的信道质量差引起的，而是由于其他原因(例如由于冲突或干扰产生严重的传输错误)引起的，那么此时使用直接链路即可进行成功重传，没必要进行协作重传。而且在该方法中，收到了源节点的DATA数据包和NACK信息的邻近节点都会自动参与协作传输，没有考虑节点选择问题。很多不必要的节点参与协作重传，将浪费大量的网络资源。The first method is that when the destination node requests retransmission using the NACK information, the neighbor node of the direct link detects the packet exchange, and retransmits the packet when a packet reception error (NACK information is detected) occurs. This method does not consider the cause of packet transmission errors. If the packet reception error is not caused by the poor channel quality of the direct link between the source node and the destination node, but due to other reasons (such as a serious transmission error due to collision or interference), then the direct chain is used at this time. The road can be successfully retransmitted, and there is no need to carry out collaborative retransmission. Moreover, in the method, the neighbor nodes that have received the DATA data packet and the NACK information of the source node automatically participate in the cooperative transmission, and do not consider the node selection problem. Many unnecessary nodes participate in collaborative retransmission and will waste a lot of network resources.
第二种方法是通过邻近节点的重传来提高多跳网络的吞吐量。然而，该方法选取距离最终目的节点最近的节点作为当前传输的接收节点，因此，即使有多个节点能进行协作传输，也只选择其中某个节点进行数据重传。由此可见，该方法仅选择一个节点将数据包传送到目的节点，并不能保证该节点就能将数据包正确地传输到目的节点。The second method is to improve the throughput of the multi-hop network by retransmission of neighboring nodes. However, the method selects the node closest to the final destination node as the receiving node of the current transmission. Therefore, even if there are multiple nodes capable of cooperative transmission, only one of the nodes is selected for data retransmission. It can be seen that the method only selects one node to transmit the data packet to the destination node, and there is no guarantee that the node can correctly transmit the data packet to the destination node.
第三种方法将数据包重传与用户协作相结合。当目标节点接收到数据包并且通过NACK信息要求重传时，协作重传节点通过监听包交换信息进行自选择，即收到了DATA数据包和NACK信息的节点都将自动参与重传。但是，该方法仍然存在如下不足之处：(1)收到了源节点DATA数据包和NACK信息的邻近节点自动参与协作传输。此时，各协作重传节点并不知道参与协作传输的节点数，而且各协作重传节点的发射功率都是自行选取的。这样，各协作重传节点可能都会以较大的功率发送数据包(其实无需这么大的功率)，导致无谓的功耗增加。(2) 该方法假设目的节点到协作重传节点的信道状态信息与协作重传节点到目的节点的信道是相同的，而没有考虑射频通道的一致性。但是在无线自组织网络中，射频通道的不一致性比蜂窝网络中的更严重。因此，该方法难于在接收端实现相干合并，无法保证多个节点协作重传的增益。The third method combines packet retransmission with user collaboration. When the target node receives the data packet and requests retransmission through the NACK information, the cooperative retransmission node performs self-selection by listening to the packet exchange information, that is, the node that receives the DATA data packet and the NACK information will automatically participate in the retransmission. However, this method still has the following shortcomings: (1) Neighboring nodes that have received the source node DATA packet and NACK information automatically participate in cooperative transmission. At this time, each cooperative retransmission node does not know the number of nodes participating in cooperative transmission, and the transmission power of each cooperative retransmission node is self-selected. In this way, each cooperative retransmission node may send packets with a large power (in fact, does not need such a large power), resulting in unnecessary power consumption increase. (2) The method assumes that the channel state information of the destination node to the cooperative retransmission node is the same as the channel of the cooperative retransmission node to the destination node, without considering the consistency of the radio frequency channel. However, in wireless ad hoc networks, RF channel inconsistencies are more severe than in cellular networks. Therefore, this method is difficult to achieve coherent combining at the receiving end, and the gain of cooperative retransmission of multiple nodes cannot be guaranteed.
发明内容Summary of the invention
本发明所要解决的首要技术问题在于提供一种无线自组织网络中的信道资源分配方法。The primary technical problem to be solved by the present invention is to provide a channel resource allocation method in a wireless ad hoc network.
本发明所要解决的另一技术问题在于提供一种无线自组织网络中的信道资源分配设备。Another technical problem to be solved by the present invention is to provide a channel resource allocation device in a wireless ad hoc network.
为实现上述发明目的，本发明采用下述的技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
根据本发明实施例的第一方面，提供一种无线自组织网络中的信道资源分配方法，用于第一节点向第二节点分配时隙，该方法包括如下步骤：According to a first aspect of the present invention, a channel resource allocation method in a wireless ad hoc network is provided, where a first node allocates a time slot to a second node, and the method includes the following steps:
所述第一节点向所述第二节点发出触发帧，The first node sends a trigger frame to the second node,
在所述触发帧中，所述第一节点根据所述第一节点与所述第二节点之间的信道的信干噪比的大小，由信干噪比最大的所述第二节点在最早的所述时隙向所述第一节点发送帧。In the trigger frame, the first node is based on a signal to interference and noise ratio of a channel between the first node and the second node, and the second node having the largest signal to interference and noise ratio is at the earliest The time slot transmits a frame to the first node.
其中较优地，所述第一节点设定信干噪比门限值，将所述第一节点与所述第二节点之间的信道的信干噪比划分到不同区域，Preferably, the first node sets a signal to interference and noise ratio threshold, and divides a signal to interference and noise ratio of the channel between the first node and the second node into different areas.
信干噪比越大，与所述信干噪比对应的所述第二节点在越早的时隙发送所述帧。The larger the signal to interference and noise ratio, the second node corresponding to the signal to interference and noise ratio transmits the frame in the earlier time slot.
其中较优地，所述时隙分成竞争阶段和反馈阶段，Preferably, the time slot is divided into a competition phase and a feedback phase.
在所述竞争阶段，首先是分布式帧间间隙，然后是竞争窗口；In the competition phase, first is a distributed interframe gap, then a contention window;
在所述反馈阶段，所述第二节点发送所述帧。In the feedback phase, the second node transmits the frame.
其中较优地，在所述分布式帧间间隙之后，经过反馈等候时间，所述第二节点才开始发送所述帧，Preferably, after the distributed interframe gap, after the feedback waiting time, the second node starts to send the frame.
所述发送等候时间由所述第二节点与所述第一节点之间的所述信干噪比决定。The transmission waiting time is determined by the signal to interference and noise ratio between the second node and the first node.
其中较优地，如果时隙1到时隙X按照信干噪比从大到小来排序，则所述发送等候时间为：Preferably, if the time slot 1 to the time slot X are sorted according to the signal to interference and noise ratio from large to small, the sending waiting time is:
Twait＝(m+n)×slot mini Twait=(m+n)×slot mini
其中，将所述信干噪比的总区间分成M段，所述M段的每个区间中细分成N个小区段；slot mini是无线自组织网络中最小的时隙单位，m＝1,2……M，n＝1,2……N，所述信干噪比越大，则对应的m取值越小，对应的n取值越小。 Wherein, the total interval of the signal to interference and noise ratio is divided into M segments, each segment of the M segments is subdivided into N small segments; the slot mini is the smallest time slot unit in the wireless ad hoc network, m=1 , 2...M, n=1, 2...N, the larger the signal to interference and noise ratio is, the smaller the corresponding m value is, and the smaller the corresponding n value is.
其中较优地，所述竞争窗口长度为：CW＝(M+N)×slot mini， Preferably, the contention window length is: CW=(M+N)×slot mini ,
其中，将所述信干噪比的总区间分成M段，所述M段的每个区间中细分成N个小区段；slot mini是无线自组织网络中最小的时隙单位。 The total interval of the signal to interference and noise ratio is divided into M segments, and each segment of the M segments is subdivided into N small segments; the slot mini is the smallest slot unit in the wireless ad hoc network.
其中较优地，所述触发帧用于限定所述第二节点发送的时隙结构，包括反馈时隙个数和反馈时隙规定字段。Preferably, the trigger frame is used to define a slot structure sent by the second node, including a feedback slot number and a feedback slot specification field.
其中较优地，所述时隙结构进一步包括SINR分段规定。Preferably, the time slot structure further includes an SINR segmentation specification.
其中较优地，所述第一节点先发送空白数据包通告帧和NDP帧，然后发送所述触发帧。Preferably, the first node first sends a blank data packet advertisement frame and an NDP frame, and then sends the trigger frame.
其中较优地，所述SINR分段规定字段包括分段数、各段的起止点以及各段的子段数；Preferably, the SINR segment specification field includes a number of segments, a start and end point of each segment, and a number of sub-segments of each segment;
所述反馈时隙规定字段包括竞争窗口长度、反馈时间长度和反馈等待时间的规定。The feedback slot specification field includes a specification of a contention window length, a feedback time length, and a feedback wait time.
根据本发明实施例的第二方面，提供一种无线自组织网络中的信道资源分配设备，用于第一节点向第二节点分配时隙；其中，该设备包括处理器和存储器，According to a second aspect of the embodiments of the present invention, a channel resource allocation device in a wireless ad hoc network is provided, where a first node allocates a time slot to a second node, where the device includes a processor and a memory,
所述存储器内存储有计算机程序，与所述处理器一起，使所述设备执行以下操作：A computer program is stored in the memory, and together with the processor, causes the device to perform the following operations:
所述第一节点向所述第二节点发出触发帧，The first node sends a trigger frame to the second node,
在所述触发帧中，所述第一节点根据所述第一节点与所述第二节点之间的信道的信干噪比的大小，由信干噪比最大的所述第二节点在最早的时隙向所述第一节点发送帧。In the trigger frame, the first node is based on a signal to interference and noise ratio of a channel between the first node and the second node, and the second node having the largest signal to interference and noise ratio is at the earliest The time slot transmits a frame to the first node.
本发明针对无线自组织网络中目的节点同时接收到多个源节点的数据引起的信号叠加问题；以及，目的节点与源节点之间信道动态变化大、不具备信道互易性的问题，提出了有效的信道资源竞争机制。利用本发明，可以提高数据重传的正确接收概率，也能够提高数据传输的可靠性，有效降低数据传输的时延。The present invention is directed to a signal superposition problem caused by a destination node receiving data of a plurality of source nodes simultaneously in a wireless ad hoc network; and a problem that a channel dynamic change between a destination node and a source node is large and does not have channel reciprocity, Effective channel resource competition mechanism. By using the invention, the correct reception probability of data retransmission can be improved, the reliability of data transmission can be improved, and the delay of data transmission can be effectively reduced.
附图说明DRAWINGS
图1为无线自组织网络的示意图；1 is a schematic diagram of a wireless ad hoc network;
图2为用于无线自组织网络的信道资源分配方法的时序示意图；2 is a timing diagram of a channel resource allocation method for a wireless ad hoc network;
图3为用于无线自组织网络的信道资源分配方法的流程示意图；3 is a schematic flowchart of a channel resource allocation method for a wireless ad hoc network;
图4为目的节点采用信道资源分配方法的流程示意图；4 is a schematic flow chart of a method for allocating a channel resource by a destination node;
图5为本发明中，重传模式触发帧的帧结构示意图；FIG. 5 is a schematic diagram of a frame structure of a retransmission mode trigger frame according to the present invention; FIG.
图6为反馈请求触发帧的帧结构示意图；6 is a schematic diagram of a frame structure of a feedback request trigger frame;
图7为反馈请求触发帧中的反馈时隙结构示意图；7 is a schematic structural diagram of a feedback slot in a feedback request trigger frame;
图8为反馈响应帧的帧结构示意图；8 is a schematic diagram of a frame structure of a feedback response frame;
图9为重传启动帧的帧结构示意图；9 is a schematic structural diagram of a frame of a retransmission start frame;
图10为协作重传ACK帧的帧结构示意图；10 is a schematic diagram of a frame structure of a cooperative retransmission ACK frame;
图11为信道资源分配设备(目的节点)的结构示意图。11 is a schematic structural diagram of a channel resource allocation device (destination node).
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明的技术内容进行详细具体的说明。The technical content of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
针对无线自组织网络中的数据包重传需求，本发明首先提供一种新的智能重传机制。在该智能重传机制中，目的节点在数据包接收错误时分析错误的原因，并采用相应的智能重传协议。该智能重传协议提供了新的重传模式触发帧(NACK-Retransmission)，该帧中带有一个字段“重传模式”(用一个比特指示：0表示源节点重传，1表示多个节点协作重传)。这样，当发送节点或邻近节点收到重传模式触发帧(NACK-Retransmission)，就能自动地选取正确的传输方法。The present invention first provides a new intelligent retransmission mechanism for data packet retransmission requirements in a wireless ad hoc network. In the intelligent retransmission mechanism, the destination node analyzes the cause of the error when the data packet is received incorrectly, and adopts a corresponding intelligent retransmission protocol. The smart retransmission protocol provides a new retransmission mode trigger frame (NACK-Retransmission) with a field "retransmission mode" (indicated by one bit: 0 means the source node retransmits, 1 means multiple nodes) Collaboration retransmission). In this way, when the transmitting node or the neighboring node receives the retransmission mode trigger frame (NACK-Retransmission), the correct transmission method can be automatically selected.
另外，为了克服现有的协作重传方法的不足，本发明主要在以下几个方面进行了改进：(1)设计了新的CQI(Channel Quality Indicator，信道质量指示)与CSI(Channel Status Information，信道状态信息)的反馈请求触发帧，并由目的节点发送：为使目的节点能确定参与协作传输的用户数和协作传输方法，设计了CQI与CSI的反馈请求触发帧，用于具有较好信道条件(CQI/SINR较高)的邻近节点反馈CQI与CSI信息、以及其与源节点之间的CQI信息(与源节点间CQI最高的那个节点，将向源节点转发ACK信息)；(2)设计了新的CQI与CSI的反馈响应帧，用于邻近节点反馈CQI与CSI信息；(3) 协作重传节点的选取与重传方法的设计：当目的节点接收到邻近节点的CQI与CSI的反馈响应帧后，确定最优的协作重传节点数，选择最优的协作重传节点，确定各节点的最优发射方法(包括发射功率、发射加权值、发送时间提前值等)，然后发送包含上述信息的协作重传启动帧；(4)各协作重传节点进行协作重传：当各节点接收到协作重传启动帧后，根据重传启动帧中指定的信息，按照指定的参数(包括发射功率、发射加权值、发送时间提前值等)发送数据包。这样，各节点发送的数据包在目的节点处将具有最大的分集合并增益，极大地提高数据包的检测概率；(5)ACK信息的发送：当目的节点正确地接收了协作重传的数据包之后，先将“重发ACK帧”发送至某个协作重传节点(该节点与源节点之间具有最佳的信道条件，也称为协作节点)，然后该协作重传节点将“重发ACK帧”转发到源节点。该智能重传机制既适用于数据包分段的重传，又适用于数据包不分段的重传。它能够提高重传数据包的正确接收概率，从而提高了无线自组织网络的总体性能。In addition, in order to overcome the deficiencies of the existing cooperative retransmission method, the present invention is mainly improved in the following aspects: (1) Designing a new CQI (Channel Quality Indicator) and CSI (Channel Status Information, The feedback request of the channel state information triggers the frame and is sent by the destination node. In order to enable the destination node to determine the number of users participating in the coordinated transmission and the coordinated transmission method, a feedback request trigger frame of CQI and CSI is designed for better channel. The neighboring node with condition (high CQI/SINR) feeds back the CQI and CSI information, and the CQI information between it and the source node (the node with the highest CQI between the source node will forward the ACK information to the source node); (2) A new CQI and CSI feedback response frame is designed for neighboring nodes to feed back CQI and CSI information. (3) Cooperative retransmission node selection and retransmission method is designed: when the destination node receives the CQI and CSI of the neighboring node After the feedback response frame, determine the optimal number of cooperative retransmission nodes, select the optimal cooperative retransmission node, and determine the optimal transmission method of each node (including transmission power, transmission weight value, and transmission). Time advance value, etc.), and then send a cooperative retransmission start frame containing the above information; (4) each cooperative retransmission node performs cooperative retransmission: when each node receives the cooperative retransmission start frame, according to the retransmission start frame specified in the frame The information is sent according to the specified parameters (including transmit power, transmit weight value, transmit time advance value, etc.). In this way, the data packets sent by each node will have the largest diversity and gain at the destination node, greatly improving the detection probability of the data packet; (5) ACK information transmission: when the destination node correctly receives the cooperative retransmitted data packet After that, the "retransmit ACK frame" is first sent to a cooperative retransmission node (the node has the best channel condition between the node and the source node, also called a cooperative node), and then the cooperative retransmission node will "retransmit" The ACK frame is forwarded to the source node. The intelligent retransmission mechanism is applicable to both retransmission of data packet segments and retransmission of data packets without segmentation. It improves the correct reception probability of retransmitted packets, thereby improving the overall performance of the wireless ad hoc network.
上述智能重传机制能够根据数据包接收错误的原因自适应地选取如下数据重传模式：(1)由源节点进行重传；或(2)多节点协作重传。其中，针对多节点协作重传模式的技术改进措施包括：(1)为确定哪些邻近节点能参与协作重传，设计了CSI与CQI的反馈请求触发帧。而且，在反馈请求触发帧中规定了基于信干噪比SINR的反馈机制，使信干噪比SINR高的那些节点能优先将CSI与CQI反馈给目的节点。(2)目的节点根据节点的反馈信息确定参与协作重传的节点数，确定哪些节点参与协作重传。而且，根据某一准则(比如：最大发射分集、最大比发射等)确定参与重传的各协作重传节点的发射功率、发射加权值、发送时间提前(TA)值等。(3)设计了协作重传启动帧，目的节点发送协作重传启动帧通知各协作重传节点重传数据包。(4)各协作重传节点收到协作重传启动帧，根据帧中指示的信息重传数据包，这样在目的节点端能获得最大的分集增益。(5)当目的节点正确地接收了重传数据包后，将发送ACK信息。该多节点协作重传模式能获得最大的分集增益，具体实施步骤如下：The above intelligent retransmission mechanism can adaptively select the following data retransmission mode according to the reason of the packet reception error: (1) retransmission by the source node; or (2) multi-node cooperative retransmission. Among them, the technical improvement measures for the multi-node cooperative retransmission mode include: (1) In order to determine which neighboring nodes can participate in cooperative retransmission, a feedback request trigger frame of CSI and CQI is designed. Moreover, a feedback mechanism based on a signal to interference and noise ratio (SINR) is specified in the feedback request trigger frame, so that those nodes with a higher signal to interference and noise ratio SINR can preferentially feed back CSI and CQI to the destination node. (2) The destination node determines the number of nodes participating in the cooperative retransmission according to the feedback information of the node, and determines which nodes participate in the cooperative retransmission. Moreover, the transmit power, the transmit weight value, the transmit time advance (TA) value, and the like of each of the cooperative retransmission nodes participating in the retransmission are determined according to a certain criterion (eg, maximum transmit diversity, maximum ratio transmission, etc.). (3) The cooperative retransmission start frame is designed, and the destination node sends a cooperative retransmission start frame to notify each cooperative retransmission node to retransmit the data packet. (4) Each cooperative retransmission node receives the cooperative retransmission start frame, and retransmits the data packet according to the information indicated in the frame, so that the maximum diversity gain can be obtained at the destination node. (5) When the destination node correctly receives the retransmitted data packet, it will send an ACK message. The multi-node cooperative retransmission mode can obtain the maximum diversity gain. The specific implementation steps are as follows:
步骤1：RTS发送Step 1: RTS sending
如图1所示，当源节点S竞争到信道使用机会时，向目标节点D发送RTS(Request To Send)包。该RTS包包括发送端地址、接收端地址、发送数据时间，RTS发送功率等信息。As shown in FIG. 1, when the source node S contends to the channel use opportunity, an RTS (Request To Send) packet is transmitted to the target node D. The RTS packet includes information such as a sender address, a receiver address, a data transmission time, and an RTS transmission power.
步骤2：CTS发送Step 2: CTS sends
当目的节点D收到RTS包后，向源节点S发送一个CTS(Clear To Send)包。该CTS包包括发送端地址、接收端地址、发送数据时间，RTS发送功率等信息。When the destination node D receives the RTS packet, it sends a CTS (Clear To Send) packet to the source node S. The CTS packet includes information such as a sender address, a receiver address, a data transmission time, and an RTS transmission power.
步骤3：DATA包发送Step 3: DATA packet transmission
当源节点S收到CTS包后，向目的节点D发送数据包Data。数据包包括发送端地址、接收端地址、发送数据时间，Data包发送功率等信息。After the source node S receives the CTS packet, it sends a data packet Data to the destination node D. The data packet includes information such as a sender address, a receiver address, a data transmission time, and a data packet transmission power.
步骤4：根据数据包出错原因，选择重传模式Step 4: Select retransmission mode based on the cause of the packet error.
目的节点D接收来自源节点S的数据包。如果目的节点D正确地接收到了数据包Data，则向源节点S发送一个ACK确认信息。如果目的节点D没有正确收到源节点S发送的数据包，则采用上述的智能重传机制。The destination node D receives the data packet from the source node S. If the destination node D correctly receives the data packet Data, an ACK confirmation message is sent to the source node S. If the destination node D does not correctly receive the data packet sent by the source node S, the above intelligent retransmission mechanism is adopted.
在智能重传机制中，需要正确分配信道资源。下面，结合图2～图10说明本发明所提供的信道资源分配方法。In the intelligent retransmission mechanism, channel resources need to be correctly allocated. Next, a channel resource allocation method provided by the present invention will be described with reference to Figs. 2 to 10 .
如图2～图4所示，根据接收到的来自源节点S的数据包，目的节点D采用常规方法判断出数据包出错的原因，例如是否是源节点与目的节点之间的信道条件导致的出错。如果不是，即源节点与目的节点之间的信道条件足够好，则选择源节点重传模式(模式1)；如果是，则选择多节点协作重传模式(模式2)。然后，根据选择的重传模式形成NACK(重传模式触发帧)，并发送出去。然后，源节点或邻近节点根据重传模式触发帧，自适应地选取重传模式。As shown in FIG. 2 to FIG. 4, according to the received data packet from the source node S, the destination node D determines the cause of the data packet error by using a conventional method, for example, whether it is caused by a channel condition between the source node and the destination node. An error occurred. If not, ie the channel conditions between the source node and the destination node are good enough, the source node retransmission mode is selected (mode 1); if so, the multi-node cooperative retransmission mode is selected (mode 2). Then, a NACK (Retransmission Mode Trigger Frame) is formed according to the selected retransmission mode, and transmitted. Then, the source node or the neighboring node triggers the frame according to the retransmission mode, and adaptively selects the retransmission mode.
无论采用哪种重传模式，目的节点都是以广播的形式发送该帧，即目的节点的邻近节点或者源节点都能收到，只是收到之后的处理方式不同而已。邻近节点收到重传模式触发帧后，如果发现该帧中的传输模式字段为“源节点重传”(值为0)，则不参与协作重传；如果发现传输模式为“协作重传”(值为1)，则主动参与重传，并准备接收来自目的节点的CSI反馈请求触发帧。Regardless of the retransmission mode, the destination node sends the frame in the form of a broadcast, that is, the neighboring node or the source node of the destination node can receive it, but the processing method after receiving it is different. After receiving the retransmission mode trigger frame, if the neighboring node finds that the transmission mode field in the frame is "source node retransmission" (value is 0), it does not participate in cooperative retransmission; if the transmission mode is found as "cooperative retransmission" (Value is 1), then actively participate in the retransmission, and is ready to receive the CSI feedback request trigger frame from the destination node.
下面具体说明这两种重传模式的具体实现过程。The specific implementation process of the two retransmission modes is specifically described below.
模式1：源节点重传(重传模式字段取值为0)Mode 1: Source node retransmission (retransmission mode field takes 0)
源节点与目的节点之间的信道条件较好，只是例如下述因素引起数据帧的接收错误：①由于数据帧的发送功率过低而引起了数据包接收错误，或者②由于目标节点接收数据时发生了碰撞。如果是原因①引起的数据帧的接收错误，则目的节点可通知源节点增加发送功率即可；如果是原因②引起的数据帧接收错误，则目的节点通过重传模式触发帧(NACK-Retransmission)通知源节点在重传时无需增加发送功率。The channel condition between the source node and the destination node is good, but the reception error of the data frame is caused by, for example, the following factors: 1 the packet reception error is caused due to the low transmission power of the data frame, or 2 when the target node receives the data. A collision has occurred. If it is the reception error of the data frame caused by the cause 1, the destination node may notify the source node to increase the transmission power; if the data frame reception error caused by the cause 2, the destination node triggers the frame by the retransmission mode (NACK-Retransmission) The source node is notified that there is no need to increase the transmission power when retransmitting.
模式2：多节点协作重传(重传模式字段取值为1)Mode 2: Multi-node cooperative retransmission (retransmission mode field takes 1)
源节点与目的节点之间的信道条件比较差，一方面源节点多次传输可能也无法正确解包，另一方面源节点可能无法正确解调目的节点发送的NACK信息。这时就需要目的节点在重传模式触发帧(NACK-Retransmission)中通知邻近节点，需要进行协作重传。The channel conditions between the source node and the destination node are relatively poor. On the one hand, the source node may not be correctly unpacked by multiple transmissions. On the other hand, the source node may not correctly demodulate the NACK information sent by the destination node. At this time, the destination node needs to notify the neighboring node in the retransmission mode trigger frame (NACK-Retransmission), and needs to perform cooperative retransmission.
步骤5：目的节点生成并发送重传模式触发帧Step 5: The destination node generates and sends a retransmission mode trigger frame.
根据上一步骤中选择的重传模式，目的节点生成重传模式触发帧。According to the retransmission mode selected in the previous step, the destination node generates a retransmission mode trigger frame.
参见图5，在本发明的一个实施例中，重传模式触发帧(NACK-Retransmission)不仅包括帧控制、持续时间、发送节点地址、目的节点地址、出错数据包编号、TP(发射功率)调整、P NACK(发送NACK信息使用的发射功率)和FCS(校验)等字段，还包括重传模式字段。 Referring to FIG. 5, in an embodiment of the present invention, a retransmission mode trigger frame (NACK-Retransmission) includes not only frame control, duration, sending node address, destination node address, error packet number, and TP (transmit power) adjustment. , P NACK (transmitting power used for transmitting NACK information) and FCS (checking) and other fields, and also include a retransmission mode field.
重传模式(Retransmission Mode)字段，可以用一个比特指示。该字段有两个值，一个为0，表示源节点重传模式；一个为1，表示多节点协作重传模式。The Retransmission Mode field can be indicated by one bit. This field has two values, one is 0, indicating the source node retransmission mode; one is 1, indicating multi-node cooperative retransmission mode.
步骤5A，发送重传模式字段为0(即，源节点重传模式)的重传模式触发帧(NACK-Retransmission)，通过重传模式触发帧中设置的发送功率调整信息(TP adjustment ΔP)字段，通知源节点在数据重传时如何调整发送功率。目的节点将重传模式触发帧直接发送给源节点，无需协作重传，进入步骤6。Step 5A: Send a retransmission mode trigger frame (NACK-Retransmission) in which the retransmission mode field is 0 (ie, the source node retransmission mode), and trigger the transmit power adjustment information (TP adjustment ΔP) field set in the frame by the retransmission mode. To inform the source node how to adjust the transmit power when the data is retransmitted. The destination node sends the retransmission mode trigger frame directly to the source node, without performing cooperative retransmission, and proceeds to step 6.
步骤5B，发送重传模式字段为1(即，多节点协作重传模式)的重传模式触发帧，当发送节点或邻近节点收到重传模式触发帧(NACK-Retransmission)，能够自动地选取正确的重传方法，进入下一步步骤7。Step 5B: Send a retransmission mode trigger frame with a retransmission mode field of 1 (ie, a multi-node cooperative retransmission mode). When the sending node or the neighboring node receives a retransmission mode trigger frame (NACK-Retransmission), the frame can be automatically selected. For the correct retransmission method, proceed to the next step 7.
步骤6：接收来自源节点的重传数据包Step 6: Receive retransmission packets from the source node
当重传模式触发帧(NACK-Retransmission)中的重传模式字段为“源 节点重传”时，表明数据包由源节点重传即可。此时，源节点接收到重传模式触发帧(NACK-Retransmission)，将根据重传模式触发帧(NACK-Retransmission)中指定的“发射功率”调节其发射功率，重新发送数据包。When the retransmission mode field in the retransmission mode trigger frame (NACK-Retransmission) is "source node retransmission", it indicates that the data packet is retransmitted by the source node. At this time, the source node receives the retransmission mode trigger frame (NACK-Retransmission), and adjusts its transmission power according to the “transmit power” specified in the retransmission mode trigger frame (NACK-Retransmission), and retransmits the data packet.
目的节点接收源节点重发的数据包，当正确接收数据包后发送ACK确认帧。当邻近节点监听到ACK帧后，将丢弃其监听到的DATA数据包。The destination node receives the data packet retransmitted by the source node, and sends an ACK acknowledgement frame when the data packet is correctly received. When the neighboring node listens to the ACK frame, it will discard the DATA packet it listens to.
步骤7：发送反馈请求触发帧Step 7: Send a feedback request trigger frame
当重传模式触发帧(NACK-Retransmission)中的重传模式字段为“多节点协作重传”时，表明数据包由源节点重传达不到目的节点正确解调的要求，此时需要利用邻近节点进行协作重传。When the retransmission mode field in the retransmission mode trigger frame (NACK-Retransmission) is “multi-node cooperative retransmission”, it indicates that the data packet is retransmitted by the source node and cannot be correctly demodulated by the destination node. The node performs cooperative retransmission.
为使目的节点能确定参与协作重传的节点和各节点的协作重传参数，本发明一方面设计了CQI与CSI的反馈请求触发帧，使邻近节点能够反馈信道信息，用于目的节点选择参与重传的节点；另一方面，设计了新的时隙化竞争信道资源的机制，让CQI/SINR较高的邻近节点优先反馈其CQI和CSI。利用这两方面的设计，可以使得具有较好信道条件(即，与目的节点之间的CQI/SINR较高)的邻近节点优先反馈CQI与CSI信息、及其与源节点之间的CQI信息(与源节点间CQI最高的那个节点，将向源节点转发ACK信息)，让目的节点优先选择这些邻近节点参与协作重传。In order to enable the destination node to determine the cooperative retransmission parameters of the nodes participating in the cooperative retransmission and the nodes, the present invention designs a feedback request trigger frame of the CQI and the CSI, so that the neighboring nodes can feedback the channel information for the destination node to select to participate. On the other hand, a new slotted contention channel resource mechanism is designed, so that neighboring nodes with higher CQI/SINR preferentially feed back their CQI and CSI. With these two aspects of the design, neighboring nodes with better channel conditions (ie, higher CQI/SINR between the destination node) can be preferentially fed back CQI and CSI information, and CQI information between them and the source node ( The node with the highest CQI between the source node will forward the ACK information to the source node, and let the destination node preferentially select these neighboring nodes to participate in the cooperative retransmission.
具体而言，如图2所示，目的节点首先发送空白数据包通告帧(NDP-A，null data packet announcement)和NDP帧，然后发送反馈请求触发帧(Trigger)。之后，邻近节点通过反馈帧(feedback frame)来反馈信道的CSI和CQI信息。最后，目的节点根据各邻近节点反馈的CSI和CQI信息确定参与协作重传的节点和协作重传方法。Specifically, as shown in FIG. 2, the destination node first sends a null data packet announcement frame (NDP-A) and an NDP frame, and then sends a feedback request trigger frame (Trigger). Thereafter, the neighboring node feeds back the CSI and CQI information of the channel through a feedback frame. Finally, the destination node determines the node and the cooperative retransmission method participating in the cooperative retransmission according to the CSI and CQI information fed back by each neighboring node.
其中，反馈请求触发帧(Trigger)规定了反馈的时隙结构。具体如图6所示，它不仅包括帧控制、持续时间、目的节点地址和校验(FCS)等字段，还包括“反馈时隙个数”、“SINR分段规定”和“反馈时隙规定”字段。其中，“SINR分段规定”字段包括分段数M、各段的起止点以及各段的子段数N等信息，其中M、N等均为正整数；“反馈时隙规定”字段包括竞争窗口长度、反馈时间长度和反馈等待时间的规定等信息。The feedback request trigger frame (Trigger) specifies the slot structure of the feedback. Specifically, as shown in FIG. 6, it includes not only fields such as frame control, duration, destination node address and check (FCS), but also "feedback slot number", "SINR segmentation specification", and "feedback slot specification". "Field. The “SINR segmentation specification” field includes information such as the number of segments M, the start and end points of each segment, and the number of sub-segments N of each segment, wherein M, N, and the like are positive integers; the “feedback slot specification” field includes a contention window. Information such as length, feedback time length, and feedback wait time.
为了让CQI/SINR较高的邻近节点优先发送并反馈CQI和CSI信息，本发明限定了基于CQI的时隙化竞争反馈机制中，CQI区间与反馈时隙的 对应关系，如图7所示。由于CQI是根据SINR得到的，两者具有对应关系，所以以下仅以SINR为例进行说明。In order to allow the neighboring nodes with higher CQI/SINR to preferentially transmit and feed back CQI and CSI information, the present invention defines the correspondence between the CQI interval and the feedback time slot in the CQI-based slotted contention feedback mechanism, as shown in FIG. 7. Since the CQI is obtained based on the SINR and the two have a corresponding relationship, the following description will be made by taking the SINR as an example.
图7所示的反馈时隙结构中，根据信干噪比SINR门限值TH 0,TH 1……TH 5(TH 0＞TH 1…＞TH 5)，从大到小，将邻近节点的反馈响应帧安排到时隙1、时隙2……时隙X(X为正整数，图中X＝6)。每个反馈时隙分成竞争阶段和反馈阶段。在竞争阶段，先是分布式帧间间隙(DCF interframe space，简称为DIFS)，然后是竞争窗口。在反馈阶段，邻近节点发送反馈信息。 In the feedback slot structure shown in FIG. 7, according to the signal to interference and noise ratio SINR threshold values TH 0 , TH 1 ... TH 5 (TH 0 >TH 1 ...>TH 5 ), from the largest to the smallest, the neighboring nodes The feedback response frame is arranged to slot 1, slot 2, ... slot X (X is a positive integer, X = 6 in the figure). Each feedback time slot is divided into a competition phase and a feedback phase. In the competition phase, first the distributed interframe space (DCF interframe space, referred to as DIFS), then the contention window. In the feedback phase, neighboring nodes send feedback information.
在每一帧DIFS之后经过反馈等候时间，待反馈的特定邻近节点才开始发送反馈信息。反馈等候时间由该邻近节点与目的节点之间的信干噪比SINR决定。After each frame of DIFS passes the feedback waiting time, the specific neighboring node to be fed back begins to send feedback information. The feedback waiting time is determined by the signal to interference and noise ratio SINR between the neighboring node and the destination node.
假设总的SINR分成了M个区间，各SINR区间又进一步分成N个子区间。此时，竞争窗口长度可设置为：It is assumed that the total SINR is divided into M intervals, and each SINR interval is further divided into N sub-intervals. At this point, the contention window length can be set to:
CW＝M×slot mini+N×slot mini               (1) CW=M×slot mini +N×slot mini (1)
假设待反馈的邻近节点与目的节点之间的SINR值位于SINR的第m个区间的第n个子区间中，则为了使SINR高的节点优先反馈CQI和CSI信息，将该节点的反馈等候时间设置为：Assuming that the SINR value between the neighboring node and the destination node to be fed back is located in the nth subinterval of the mth interval of the SINR, the feedback waiting time setting of the node is set in order to preferentially feed the CQI and CSI information to the node with high SINR. for:
Twait＝(m+n)×slot mini               (2) Twait=(m+n)×slot mini (2)
其中，根据信干噪比SINR的总区间分成M段，M段的区间中每一区间i细分成N个小区段；划分M段的信干噪比门限值Th满足Th i,n＝(Th i-1-Th i)；slot mini是无线自组织网络中最小的时隙单位。其中，m＝1,2……M，n＝1,2……N，信干噪比SINR越大，则m取值越小，n取值越小(修改公式后，信干噪比越大，m越小，反馈等候时间就越短)。因此，根据公式(2)可以知道，信干噪比SINR越大，其反馈等候时间越小(即，CQI高的节点的反馈等候时间设计得较短)，更易于获得向目的节点发送反馈信息的机会，从而实现使CQI/SINR高的节点优先反馈CQI与CSI信息。 The total interval of the SINR is divided into M segments, and each interval i of the M segments is subdivided into N small segments; the signal to interference and noise ratio threshold Th of the divided M segments satisfies Th i,n = (Th i-1 -Th i ); slot mini is the smallest slot unit in a wireless ad hoc network. Where m=1, 2...M, n=1, 2...N, the larger the signal to interference and noise ratio SINR, the smaller the value of m and the smaller the value of n (after modifying the formula, the more the signal to noise ratio is Big, m is smaller, the feedback waiting time is shorter). Therefore, according to formula (2), it can be known that the larger the signal to interference and noise ratio SINR is, the smaller the feedback waiting time is (ie, the feedback waiting time of the node with high CQI is designed to be shorter), and it is easier to obtain the feedback information to the destination node. The opportunity to achieve a CQI/SINR high priority feedback CQI and CSI information.
本领域普通技术人员可以理解，公式(1)和公式(2)也可以有其它替代公式，例如：One of ordinary skill in the art will appreciate that equations (1) and (2) may have other alternative formulas, such as:
CW＝M×slot mini               (1A) CW=M×slot mini (1A)
Twait＝m×slot mini               (2A) Twait=m×slot mini (2A)
另外，如果时隙1到时隙X按照信干噪比SINR(或者CQI信息)从小到大来排序(即，图7中SINR箭头反向)，即满足TH 0＜TH 1…＜TH 5，则如果某一邻近节点的SINR位于第m区域的第n子区域，则可以采用以下公式计算反馈等候时间： In addition, if time slot 1 to time slot X are sorted according to the signal to interference and noise ratio SINR (or CQI information) from small to large (ie, the SINR arrow is reversed in FIG. 7), that is, TH 0 <TH 1 ... <TH 5 is satisfied. Then, if the SINR of a neighboring node is located in the nth subregion of the mth region, the feedback waiting time can be calculated by the following formula:
Twait＝(M-m+1)×slot mini+(N-n+1)×slot mini   (2B) Twait=(M-m+1)×slot mini +(N-n+1)×slot mini (2B)
由此可见，与目的节点之间的信干噪比SINR最大的邻近节点，基于CQI的时隙化竞争反馈机制，会被分配到时隙0，并且反馈等候时间Twait最短，所以是最早发送反馈的邻近节点。It can be seen that the neighboring node with the highest signal-to-noise ratio SINR between the destination node and the CQI-based slotted contention feedback mechanism is allocated to slot 0, and the feedback waiting time Twait is the shortest, so it is the earliest transmission feedback. Neighboring nodes.
需要说明的是，时隙化竞争信道资源的机制不限于本发明所提供的反馈请求触发帧。它还可以应用于无线自组织网络中的信道资源分配，使信道条件好的节点优先分配信道资源。在本发明所提供的时隙化竞争信道资源的机制应于信道资源分配时，上文所述的“反馈等候时间”就可以是各种控制帧的“发送等候时间”，不限制为反馈等候时间。It should be noted that the mechanism for slotting the contention channel resources is not limited to the feedback request trigger frame provided by the present invention. It can also be applied to channel resource allocation in a wireless ad hoc network, so that nodes with good channel conditions preferentially allocate channel resources. When the mechanism for slotted contention channel resources provided by the present invention is to be allocated to channel resources, the "feedback waiting time" described above may be the "transmission waiting time" of various control frames, and is not limited to feedback waiting. time.
步骤8：目的节点接收到反馈响应帧Step 8: The destination node receives the feedback response frame.
邻近节点接收到反馈请求触发帧后，进行同步，估计邻近节点与目的节点的信道状态信息CSI和CQI，计算其接收定时RX与发送定时TX的时间差、确定在哪个时隙中反馈CQI和CSI，以及反馈等候时间。After receiving the feedback request trigger frame, the neighboring node performs synchronization, estimates channel state information CSI and CQI of the neighboring node and the destination node, calculates a time difference between the receiving timing RX and the transmitting timing TX, and determines in which time slot the CQI and CSI are fed back. And feedback waiting time.
具体而言，当邻近节点收到CSI与CQI的反馈请求触发帧后，利用CSI与CQI的反馈请求触发帧的帧头信息进行同步，并根据该帧头信息估计其与目的节点之间的SINR/CQI和CSI信息。这是常规方法，不详述。Specifically, after the neighboring node receives the CSI and CQI feedback request trigger frame, the CSI and CQI feedback request trigger frame header information is synchronized, and the SINR between the target node and the destination node is estimated according to the frame header information. /CQI and CSI information. This is a conventional method and is not detailed.
根据估计到的其与目的节点之间的SINR/CQI，邻近节点可以根据反馈请求触发帧中的反馈时隙结构信息(SINR分段规定、反馈时隙规定等)，判断出邻近节点的SINR属于图7所示的哪个时隙(即应该在那个时隙反馈CQI和CSI，发送反馈响应帧)，也根据公式(2)计算出反馈等候时间。According to the estimated SINR/CQI between the target node and the destination node, the neighboring node may trigger the feedback slot structure information (SINR segmentation specification, feedback slot specification, etc.) in the frame according to the feedback request, and determine that the SINR of the neighboring node belongs to Which time slot is shown in Fig. 7 (i.e., CQI and CSI should be fed back in that time slot, and a feedback response frame is transmitted), and the feedback waiting time is also calculated according to formula (2).
至于其接收定时RX与发送定时TX的时间差的计算，从目的节点发送的CSI与CQI的反馈请求触发帧中的同步信号，该邻近节点可以确定接收定时STA_RX_t。假设该邻近节点向目的节点发送CSI与CQI的反馈响应帧的发送定时为STA_TX_t，则该邻近节点的接收定时RX与发送定时TX的时间差(STA_RX_TX time difference)计算如下:As for the calculation of the time difference between the reception timing RX and the transmission timing TX, the feedback request of the CSI and CQI transmitted from the destination node triggers the synchronization signal in the frame, and the neighboring node can determine the reception timing STA_RX_t. Assuming that the transmission timing of the feedback response frame in which the neighboring node transmits the CSI and the CQI to the destination node is STA_TX_t, the time difference between the reception timing RX of the neighboring node and the transmission timing TX (STA_RX_TX time difference) is calculated as follows:
STA_RX_TX time difference＝STA_RX_t-STA_TX_t,    (3)STA_RX_TX time difference=STA_RX_t-STA_TX_t, (3)
邻近节点根据其计算的反馈等候时间，在其确定的反馈响应帧发送 时隙，利用反馈响应帧(如图8所示)将其与目的节点之间的SINR/CQI和CSI信息，及其与源节点之间的SINR/CQI信息反馈给目的节点。The neighboring node according to its calculated feedback waiting time, in its determined feedback response frame transmission time slot, uses the feedback response frame (as shown in FIG. 8) to compare its SINR/CQI and CSI information with the destination node, and The SINR/CQI information between the source nodes is fed back to the destination node.
反馈响应帧如图8所示，包含如下信息：目的节点地址、持续时间、重传节点地址、CQI信息和CSI信息、与源节点间的CQI信息、接收定时RX与发送定时TX的时间差。其中，重传节点地址就是发送该反馈响应帧的邻近节点的地址；CQI信息和CSI信息是发送反馈响应帧的邻近节点估计的其与目的节点之间的CQI和CSI信息；与源节点间的CQI信息是指发送反馈响应帧的邻近节点估计的其与源节点间的CQI信息。As shown in FIG. 8, the feedback response frame includes the following information: destination node address, duration, retransmission node address, CQI information and CSI information, CQI information with the source node, and the time difference between the reception timing RX and the transmission timing TX. The retransmission node address is an address of a neighboring node that sends the feedback response frame; the CQI information and the CSI information are CQI and CSI information between the neighboring node and the destination node estimated by the neighboring node that sends the feedback response frame; The CQI information refers to CQI information between the source node and the source node estimated by the neighboring node transmitting the feedback response frame.
目的节点根据其生成反馈请求触发帧时规定的反馈时隙结构，接收到来自邻近节点的反馈响应帧。The destination node receives the feedback response frame from the neighboring node according to the feedback slot structure specified when the feedback request is triggered.
步骤9：目的节点选定协作重传节点，确定协作重传方法，并形成重传启动帧Step 9: The destination node selects a cooperative retransmission node, determines a cooperative retransmission method, and forms a retransmission start frame.
在本步骤中，目的节点确定参与重传的节点、确定协作重传方法以及各节点的发送定时提前值。In this step, the destination node determines the node participating in the retransmission, determines the cooperative retransmission method, and the transmission timing advance value of each node.
目的节点根据各节点的反馈响应帧中的信息，结合重传数据包的大小，确定最优的协作重传节点和协作重传方法(包括各节点重传时的发送功率、发射加权系数等)，如图9所示。The destination node determines the optimal cooperative retransmission node and the cooperative retransmission method according to the information in the feedback response frame of each node and the size of the retransmission data packet (including the transmission power, transmission weighting coefficient, etc. of each node during retransmission). , as shown in Figure 9.
协作重传方法可采用常规无线通信系统中(比如LTE系统)的协作传输方法，包含最大比发射方法、最大空间分集发射方法等。The cooperative retransmission method may employ a cooperative transmission method in a conventional wireless communication system (such as an LTE system), including a maximum ratio transmission method, a maximum space diversity transmission method, and the like.
比如，假设选取了L个节点参与协作传输，且采用常规的最大比发射方法。假设L个节点到目的节点之间的信道矩阵(CSI)可表示为：For example, suppose that L nodes are selected to participate in cooperative transmission, and a conventional maximum ratio transmission method is adopted. It is assumed that the channel matrix (CSI) between the L nodes and the destination node can be expressed as:
Figure PCTCN2018095515-appb-000001
Figure PCTCN2018095515-appb-000001
式中，α rd,l和h rd,l分别表示协作链路l的大尺度路径损失和信道系数。当采用最大比发射方法时，发射加权矢量应该为： Where α rd,l and h rd,l represent the large-scale path loss and channel coefficients of the cooperative link 1 , respectively. When using the maximum ratio transmission method, the transmission weight vector should be:
Figure PCTCN2018095515-appb-000002
Figure PCTCN2018095515-appb-000002
因此，目的节点可根据公式(5)可确定各协作重传节点的发射加权系数和发射功率。这里可采用常规方法。Therefore, the destination node can determine the transmission weighting coefficient and the transmission power of each cooperative retransmission node according to formula (5). Conventional methods can be employed here.
下面进一步介绍目的节点确定各协作重传节点在重传数据包时的定时提前(TA)值的过程。The process of determining the timing advance (TA) value of each cooperative retransmission node when retransmitting a data packet is further described below.
在多个协作重传节点同时向目的节点重传数据包时，要求不同协作重传节点发送的信号达到目的节点的时间是对齐的且同相相加，这样目的节点才能对来自不同节点的重传信号进行相干合并，达到最大的合并增益。因此，目的节点需要适当地控制各协作重传节点在重传数据包的定时提前(TA)值，使不同STA的信号同时到达目的节点。也就是说，目的节点将各协作重传节点重传数据包的定时提前(TA)值通知各协作重传节点。When multiple cooperative retransmission nodes simultaneously retransmit data packets to the destination node, it is required that the signals sent by different cooperative retransmission nodes reach the destination node are aligned and added in phase, so that the destination node can retransmit the data from different nodes. The signals are coherently combined to achieve maximum combined gain. Therefore, the destination node needs to appropriately control the timing advance (TA) value of each cooperative retransmission node in retransmitting the data packet, so that the signals of different STAs reach the destination node at the same time. That is to say, the destination node notifies each cooperative retransmission node of the timing advance (TA) value of each cooperative retransmission node retransmitting the data packet.
首先，目的节点接收到各节点的CQI与CSI的反馈响应帧后，根据帧头的前导部分估计其与各节点之间的CSI和SINR/CQI，及根据帧头中的同步信号确定接收定时D_STA_RX_t。假设目的节点发送反馈请求触发帧(Trigger)的发送定时为D_STA_TX_t。此时，目的节点的接收定时D_STA_RX_t与发送定时D_STA_TX_t之间的时间差(D_STA_RX_TX time difference)计算为：First, after receiving the feedback response frame of CQI and CSI of each node, the destination node estimates the CSI and SINR/CQI between the node and the node according to the preamble of the frame header, and determines the reception timing D_STA_RX_t according to the synchronization signal in the frame header. . Assume that the destination node sends a feedback request trigger frame (Trigger) with a transmission timing of D_STA_TX_t. At this time, the time difference (D_STA_RX_TX time difference) between the reception timing D_STA_RX_t of the destination node and the transmission timing D_STA_TX_t is calculated as:
D_STA_RX_TX time difference＝D_STA_RX_t-D_STA_TX_t   (6)D_STA_RX_TX time difference=D_STA_RX_t-D_STA_TX_t (6)
根据式(3)和(6)，各协作重传节点重传数据包的发送定时提前(TA,time advance)值的确定方法如下：According to the equations (3) and (6), the method for determining the transmission timing advance (TA, time advance) value of each cooperative retransmission node retransmission data packet is as follows:
TA＝(STA_RX_t-STA_TX_t)+(D_STA_RX_t-D_STA_TX_t)   (7)TA=(STA_RX_t-STA_TX_t)+(D_STA_RX_t-D_STA_TX_t) (7)
在本发明所提供的信道资源分配方法中，由于目的节点与源节点之间的信道质量比较差，此时源节点可能无法接收到目的节点发送的ACK信息。因此，目的节点需要在参与协作重传的节点中，确定与源节点之间信道质量最好的节点，由该节点向源节点转发目的节点的ACK信息。为达到此目的，目的节点可根据各节点反馈的其与源节点之间的SINR/CQI信息，确定与源节点之间信道质量最好的节点。In the channel resource allocation method provided by the present invention, the source node may not receive the ACK information sent by the destination node because the channel quality between the destination node and the source node is relatively poor. Therefore, the destination node needs to determine the node with the best channel quality between the source node and the node participating in the cooperative retransmission, and the node forwards the ACK information of the destination node to the source node. To achieve this, the destination node may determine the node with the best channel quality between the source node and the SINR/CQI information between the source node and the source node.
步骤10：目的节点向选定的重传节点发送协作重传启动帧Step 10: The destination node sends a coordinated retransmission start frame to the selected retransmission node.
此时，由于源节点不一定能接收到目标节点的重传模式触发帧中的信息，目标节点需要根据各协作重传节点的反馈信息，确定与源节点之间CQI最大的那个协作重传节点，并在协作重传启动帧中通知该节点转告源节点对错误的数据包进行了重传，且在正确重传结束后，目的节点还要由该节点转告源节点已将数据包进行了正确的重传。At this time, since the source node may not be able to receive the information in the retransmission mode trigger frame of the target node, the target node needs to determine the cooperative retransmission node with the largest CQI between the source node and the feedback information of each coordinated retransmission node. And in the cooperative retransmission start frame, notifying the node that the source node retransmits the erroneous data packet, and after the correct retransmission ends, the destination node further reports that the source node has correctly performed the data packet. Retransmission.
最后，为使各协作重传节点向目的节点重传数据包，目的节点向各协作重传节点发送协作重传启动帧，如图9所示。协作重传启动帧包括 的字段有：源节点地址，目的节点地址，协作重传节点TX1的重传方法，节点TX 2的重传方法，…,协作重传节点P的重传方法，ACK转发节点的地址，数据包发送时间，重传持续时间等。其中，协作重传节点的重传方法包括如下内容：各协作重传节点的地址，发射功率，发射加权系数和发送定时提前值TA。Finally, in order for each cooperative retransmission node to retransmit the data packet to the destination node, the destination node sends a cooperative retransmission initiation frame to each coordinated retransmission node, as shown in FIG. The fields included in the cooperative retransmission start frame include: source node address, destination node address, retransmission method of cooperative retransmission node TX1, retransmission method of node TX 2, ..., retransmission method of cooperative retransmission node P, ACK forwarding The address of the node, the time the packet was sent, the duration of the retransmission, and so on. The retransmission method of the cooperative retransmission node includes the following: an address of each coordinated retransmission node, a transmission power, a transmission weighting coefficient, and a transmission timing advance value TA.
各协作重传节点的地址，由目的节点根据其最先接收到的反馈响应帧，选择能够目的节点与源节点之间经过2跳就可以达到的节点，作为协作重传节点，然后目的节点将该选定的多个协作重传节点的地址作为协作重传启动帧中的各协作重传节点的地址。简而言之，目的节点根据其接收反馈响应帧的时间先后，选择较早接收到的2跳节点，作为协作重传节点，在协作重传启动帧中列入相应协作重传节点的地址。The address of each coordinated retransmission node is selected by the destination node according to the feedback response frame received by the destination node, and the node that can be reached after 2 hops between the destination node and the source node is used as the cooperative retransmission node, and then the destination node will The addresses of the selected plurality of cooperative retransmission nodes are the addresses of the cooperative retransmission nodes in the cooperative retransmission initiation frame. In short, the destination node selects the earlier received 2-hop node according to the chronological order of the received feedback response frame, and acts as the cooperative retransmission node, and lists the address of the corresponding cooperative retransmission node in the cooperative retransmission start frame.
各协作重传节点的发射功率和发射加权系数，由目的节点通过其选定的协作重传节点发送的反馈响应帧中的CSI信息，计算得到，例如利用公式(5)计算得到。The transmit power and the transmit weighting coefficient of each coordinated retransmission node are calculated by the destination node through the CSI information in the feedback response frame sent by the selected cooperative retransmission node, and are calculated, for example, by using equation (5).
发送定时提前值TA，是由目的节点在步骤9中根据公式(7)计算得到的。The transmission timing advance value TA is calculated by the destination node in accordance with equation (7) in step 9.
步骤11：目的节点在正确解调重发数据包后发送协作重传ACK帧Step 11: The destination node sends a cooperative retransmission ACK frame after correctly demodulating the retransmitted data packet.
各邻近节点收到目的节点发送的协作重传启动帧后，根据协作重传启动帧中的协作重传节点地址，判断该节点是否参与重传。如果协作重传启动帧中包含该节点的地址，则该节点作为协作重传节点参与重传；如果协作重传启动帧中不包含该节点的地址，则该节点不参与协作重传。After receiving the coordinated retransmission start frame sent by the destination node, each neighboring node determines whether the node participates in the retransmission according to the cooperative retransmission node address in the cooperative retransmission start frame. If the cooperative retransmission start frame contains the address of the node, the node participates in retransmission as a cooperative retransmission node; if the coordinated retransmission start frame does not include the address of the node, the node does not participate in cooperative retransmission.
如果被判断为协作重传节点，则该协作重传节点进一步根据协作重传启动帧中规定的该节点发射功率、发射加权系数、及发送定时提前值等，向目的节点重传数据包。If it is determined as a cooperative retransmission node, the cooperative retransmission node further retransmits the data packet to the destination node according to the node transmit power, the transmit weighting coefficient, and the transmit timing advance value specified in the cooperative retransmission start frame.
最后，目的节点接收解调获得协作重发的数据包。如果目的节点正确地解调了协作重发的数据包，就向ACK转发节点(即步骤9中选择的信道质量最好的节点)发送协作重传ACK帧信息。Finally, the destination node receives the demodulation to obtain a cooperative retransmitted data packet. If the destination node correctly demodulates the cooperatively retransmitted data packet, it transmits the cooperative retransmission ACK frame information to the ACK forwarding node (i.e., the node with the best channel quality selected in step 9).
协作重传ACK帧的具体结构如图10所示，包括ACK转发节点的地址、帧控制、持续时间、发送节点地址、目的节点地址、出错数据包编号以及FCS。其中，ACK转发节点的地址就是在步骤9中被目的节点选定的信道质量最好的节点的地址。The specific structure of the cooperative retransmission ACK frame is as shown in FIG. 10, including the address, frame control, duration, sending node address, destination node address, error packet number, and FCS of the ACK forwarding node. The address of the ACK forwarding node is the address of the node with the best channel quality selected by the destination node in step 9.
而且，当协作重传ACK帧中指定的节点，ACK转发节点，收到协作重传ACK帧后，就向源节点转发该协作重传ACK帧，向源节点表示数据包已成功重传到目的节点。Moreover, when the node specified in the ACK frame is cooperatively retransmitted, the ACK forwarding node receives the cooperative retransmission ACK frame, and then forwards the cooperative retransmission ACK frame to the source node, indicating to the source node that the data packet has been successfully retransmitted to the destination. node.
下面，介绍作为目的节点100的信道资源分配设备的具体结构。图11为该信道资源分配设备的结构示意图。该信道资源分配设备至少包括处理器、存储器和接口等器件。其中，存储器内存储有计算机程序，用于与处理器一起，使该设备能够执行前述步骤1～步骤11的过程，从而实现本发明所提供的信道资源分配方法。Next, a specific structure of the channel resource allocation device as the destination node 100 will be described. FIG. 11 is a schematic structural diagram of the channel resource allocation device. The channel resource allocation device includes at least a device such as a processor, a memory, and an interface. The computer program is stored in the memory for use with the processor to enable the device to perform the processes of the foregoing steps 1 to 11, thereby implementing the channel resource allocation method provided by the present invention.
在本发明中，重传模式触发帧、反馈请求触发帧、反馈响应帧、协作重传启动帧和协作重传ACK帧均属于控制帧，使用无线自组织网络中的控制帧使用的常规接口进行传输。此外，重传数据帧使用无线自组织网络中的控制帧使用的常规接口进行传输。In the present invention, the retransmission mode trigger frame, the feedback request trigger frame, the feedback response frame, the cooperative retransmission start frame, and the cooperative retransmission ACK frame belong to the control frame, and are performed using a conventional interface used by the control frame in the wireless ad hoc network. transmission. In addition, retransmitted data frames are transmitted using conventional interfaces used by control frames in a wireless ad hoc network.
本发明通过增加额外的CQI获取流程(包括CQI反馈请求触发帧，CQI反馈响应帧，协作重传启动帧等)，带来了如下技术性能增益：The present invention brings the following technical performance gains by adding an additional CQI acquisition process (including CQI feedback request trigger frame, CQI feedback response frame, cooperative retransmission start frame, etc.):
(a)在协作重传节点选取中，选择了信道条件最好的节点，并确定了最优的节点数和节点。此外，为各节点确定了最优的发射方法(包括发射功率、发送加权系数、及发送时间提前量等)。这样，就保证了各节点重传的信号同时到达目的节点，并保证了最大的合并增益。可见，本发明极大地提高了数据重传的正确接收概率，也提高了数据传输的可靠性。(a) In the cooperative retransmission node selection, the node with the best channel condition is selected, and the optimal number of nodes and nodes are determined. In addition, an optimal transmission method (including transmission power, transmission weighting factor, and transmission timing advance, etc.) is determined for each node. In this way, it is ensured that the signals retransmitted by each node reach the destination node at the same time, and the maximum combining gain is guaranteed. It can be seen that the invention greatly improves the correct reception probability of data retransmission and improves the reliability of data transmission.
(b)在现有协作重传方法中，各节点的重传信号难以同时到达目的节点，且难以实现相干合并。因此，数据包的传输性能难以保证。相比之下，本发明虽然增加了一些信令开销，但极大地提高了数据重传的正确接收概率，并提高了数据传输的可靠性。这样，本方法通过保证数据传输的可靠性，有效地降低了数据传输的时延。(b) In the existing cooperative retransmission method, it is difficult for the retransmission signals of each node to reach the destination node at the same time, and it is difficult to achieve coherent combining. Therefore, the transmission performance of the data packet is difficult to guarantee. In contrast, although the invention adds some signaling overhead, it greatly improves the correct reception probability of data retransmission and improves the reliability of data transmission. Thus, the method effectively reduces the delay of data transmission by ensuring the reliability of data transmission.
上面对本发明所提供的无线自组织网络中的信道资源分配方法及其设备进行了详细的说明。对本领域的一般技术人员而言，在不背离本发明实质的前提下对它所做的任何显而易见的改动，都将构成对本发明专利权的侵犯，将承担相应的法律责任。The channel resource allocation method and device in the wireless ad hoc network provided by the present invention are described in detail above. Any obvious changes made to the present invention without departing from the essence of the invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal liabilities.

Claims (15)

  1. 一种无线自组织网络中的信道资源分配方法，用于第一节点向第二节点分配时隙，其特征在于：A channel resource allocation method in a wireless ad hoc network, configured for a first node to allocate a time slot to a second node, wherein:
    所述第一节点向所述第二节点发出触发帧，The first node sends a trigger frame to the second node,
    在所述触发帧中，所述第一节点根据所述第一节点与所述第二节点之间的信道的信干噪比的大小，由信干噪比最大的所述第二节点在最早的所述时隙向所述第一节点发送帧。In the trigger frame, the first node is based on a signal to interference and noise ratio of a channel between the first node and the second node, and the second node having the largest signal to interference and noise ratio is at the earliest The time slot transmits a frame to the first node.
  2. 如权利要求1所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 1, wherein:
    所述第一节点设定信干噪比门限值，将所述第一节点与所述第二节点之间的信道的信干噪比划分到不同区域，Setting, by the first node, a signal to interference and noise ratio threshold, dividing a signal to interference and noise ratio of a channel between the first node and the second node into different areas,
    信干噪比越大，与所述信干噪比对应的所述第二节点在越早的时隙发送所述帧。The larger the signal to interference and noise ratio, the second node corresponding to the signal to interference and noise ratio transmits the frame in the earlier time slot.
  3. 如权利要求2所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 2, wherein:
    所述时隙分成竞争阶段和反馈阶段，The time slots are divided into a competition phase and a feedback phase.
    在所述竞争阶段，首先是分布式帧间间隙，然后是竞争窗口；In the competition phase, first is a distributed interframe gap, then a contention window;
    在所述反馈阶段，所述第二节点发送所述帧。In the feedback phase, the second node transmits the frame.
  4. 如权利要求3所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 3, wherein:
    在所述分布式帧间间隙之后，经过反馈等候时间，所述第二节点才开始发送所述帧，After the distributed interframe gap, after the feedback waiting time, the second node starts to send the frame.
    所述发送等候时间由所述第二节点与所述第一节点之间的所述信干噪比决定。The transmission waiting time is determined by the signal to interference and noise ratio between the second node and the first node.
  5. 如权利要求4所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 4, wherein:
    如果时隙1到时隙X按照信干噪比从大到小来排序，则所述发送等候时间为：If slot 1 to slot X are sorted according to the signal to interference and noise ratio from large to small, the transmission waiting time is:
    Twait＝(m+n)×slot mini Twait=(m+n)×slot mini
    其中，将所述信干噪比的总区间分成M段，所述M段的每个区间中细分成N个小区段；slot mini是无线自组织网络中最小的时隙单位，m＝1,2……M，n＝1,2……N，所述信干噪比越大，则对应的m取值越小，对应的n取值越小。 Wherein, the total interval of the signal to interference and noise ratio is divided into M segments, each segment of the M segments is subdivided into N small segments; the slot mini is the smallest time slot unit in the wireless ad hoc network, m=1 , 2...M, n=1, 2...N, the larger the signal to interference and noise ratio is, the smaller the corresponding m value is, and the smaller the corresponding n value is.
  6. 如权利要求4所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 4, wherein:
    所述竞争窗口长度为：CW＝(M+N)×slot mini， The length of the contention window is: CW=(M+N)×slot mini ,
    其中，将所述信干噪比的总区间分成M段，所述M段的每个区间中细分成N个小区段；slot mini是无线自组织网络中最小的时隙单位。 The total interval of the signal to interference and noise ratio is divided into M segments, and each segment of the M segments is subdivided into N small segments; the slot mini is the smallest slot unit in the wireless ad hoc network.
  7. 如权利要求1所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 1, wherein:
    所述触发帧用于限定所述第二节点发送的时隙结构，包括反馈时隙个数和反馈时隙规定字段。The trigger frame is configured to define a slot structure sent by the second node, including a feedback slot number and a feedback slot specification field.
  8. 如权利要求7所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 7, wherein:
    所述时隙结构进一步包括SINR分段规定。The slot structure further includes an SINR segmentation specification.
  9. 如权利要求8所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 8, wherein:
    所述第一节点先发送空白数据包通告帧和NDP帧，然后发送所述触发帧。The first node first sends a blank packet advertisement frame and an NDP frame, and then sends the trigger frame.
  10. 如权利要求1所述的信道资源分配方法，其特征在于：The channel resource allocation method according to claim 1, wherein:
    所述SINR分段规定字段包括分段数、各段的起止点以及各段的子段数；The SINR segment specification field includes a number of segments, a start and end point of each segment, and a number of sub-segments of each segment;
    所述反馈时隙规定字段包括竞争窗口长度、反馈时间长度和反馈等待时间的规定。The feedback slot specification field includes a specification of a contention window length, a feedback time length, and a feedback wait time.
  11. 一种无线自组织网络中的信道资源分配设备，用于第一节点向第二节点分配时隙，其特征在于包括处理器和存储器；A channel resource allocation device in a wireless ad hoc network, configured to allocate a time slot to a second node by a first node, and is characterized by comprising a processor and a memory;
    所述存储器内存储有计算机程序，与所述处理器一起，使所述设备执行以下操作：A computer program is stored in the memory, and together with the processor, causes the device to perform the following operations:
    所述第一节点向所述第二节点发出触发帧，The first node sends a trigger frame to the second node,
    在所述触发帧中，所述第一节点根据所述第一节点与所述第二节点之间的信道的信干噪比的大小，由信干噪比最大的所述第二节点在最早的时隙向所述第一节点发送帧。In the trigger frame, the first node is based on a signal to interference and noise ratio of a channel between the first node and the second node, and the second node having the largest signal to interference and noise ratio is at the earliest The time slot transmits a frame to the first node.
  12. 如权利要求11所述的信道资源分配设备，其特征在于：The channel resource allocation device according to claim 11, wherein:
    所述处理器使所述第一节点设定信干噪比门限值，将所述第一节点与所述第二节点之间的信道的信干噪比划分到不同区域，The processor causes the first node to set a signal to interference and noise ratio threshold, and divides a signal to interference and noise ratio of a channel between the first node and the second node into different areas,
    信干噪比越大，与所述信干噪比对应的所述第二节点在越早的时隙发送所述帧。The larger the signal to interference and noise ratio, the second node corresponding to the signal to interference and noise ratio transmits the frame in the earlier time slot.
  13. 如权利要求12所述的信道资源分配设备，其特征在于：A channel resource allocation device according to claim 12, wherein:
    所述时隙分成竞争阶段和反馈阶段，The time slots are divided into a competition phase and a feedback phase.
    在所述竞争阶段，首先是分布式帧间间隙，然后是竞争窗口；In the competition phase, first is a distributed interframe gap, then a contention window;
    在所述反馈阶段，所述第二节点发送所述帧。In the feedback phase, the second node transmits the frame.
  14. 如权利要求13所述的信道资源分配设备，其特征在于：The channel resource allocation device according to claim 13, wherein:
    所述处理器使所述第二节点，在所述分布式帧间间隙之后，经过反馈等候时间，才开始发送所述帧，The processor causes the second node to start transmitting the frame after a feedback waiting time after the distributed interframe gap.
    所述发送等候时间由所述第二节点与所述第一节点之间的所述信干噪比决定。The transmission waiting time is determined by the signal to interference and noise ratio between the second node and the first node.
  15. 如权利要求13所述的信道资源分配设备，其特征在于：The channel resource allocation device according to claim 13, wherein:
    所述触发帧用于限定所述第二节点发送的时隙结构，包括反馈时隙个数、SINR分段规定和反馈时隙规定字段。The trigger frame is configured to define a slot structure sent by the second node, including a number of feedback slots, an SINR segment specification, and a feedback slot specification field.
PCT/CN2018/095515 2017-12-31 2018-07-12 Channel resource allocation method and device thereof in wireless self-organizing network WO2019128192A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201711497461.4A CN109996342B (en) 2017-12-31 2017-12-31 Channel resource allocation method and device in wireless self-organizing network
CN201711497461.4 2017-12-31

Publications (1)

Publication Number Publication Date
WO2019128192A1 true WO2019128192A1 (en) 2019-07-04

Family

ID=67063005

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/095515 WO2019128192A1 (en) 2017-12-31 2018-07-12 Channel resource allocation method and device thereof in wireless self-organizing network

Country Status (2)

Country Link
CN (1) CN109996342B (en)
WO (1) WO2019128192A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101212285A (en) * 2007-12-25 2008-07-02 中国人民解放军理工大学 Opportunity synergy based automatic retransmission request method
CN102026299A (en) * 2009-09-14 2011-04-20 华为技术有限公司 Method and system for consulting time frequency resource, and node equipment
CN103326769A (en) * 2013-06-18 2013-09-25 北京航空航天大学 Multi-node cooperative transmission method and system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101801026B (en) * 2009-02-11 2013-03-20 华为技术有限公司 Method, device and system for selecting collaboration retransmission node
CN101868030B (en) * 2010-05-25 2013-04-10 华南理工大学 Distributed wireless network wireless resource distribution method
CN106714115B (en) * 2016-12-21 2019-06-14 厦门大学 A kind of security message single-hop in car networking cooperates broadcasting method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101212285A (en) * 2007-12-25 2008-07-02 中国人民解放军理工大学 Opportunity synergy based automatic retransmission request method
CN102026299A (en) * 2009-09-14 2011-04-20 华为技术有限公司 Method and system for consulting time frequency resource, and node equipment
CN103326769A (en) * 2013-06-18 2013-09-25 北京航空航天大学 Multi-node cooperative transmission method and system

Also Published As

Publication number Publication date
CN109996342A (en) 2019-07-09
CN109996342B (en) 2023-05-23

Similar Documents

Publication Publication Date Title
US11711847B2 (en) MU-MIMO pre-packet arrival channel contention
RU2680193C2 (en) Data transmission method in wireless communication system and device therefor
US20200045574A1 (en) Method and system for directional-band relay enhancements
JP6437425B2 (en) Management of acknowledgment messages from multiple destinations for multi-user MIMO transmission
JP6635165B2 (en) Wireless communication device and wireless communication method
CN109348537A (en) Multi-beam self-organizing network channel access control method
CN112291045A (en) Method and apparatus for transmitting an acknowledgement in response to a received frame
WO2014206115A1 (en) Uplink multiuser data transmission method and uplink multiuser input and output system
KR20160091360A (en) System and method for multicast communications in wireless networks
JP2009207147A (en) Multicast method in wireless lan
CN114762439A (en) Coordinating stations in a single BSS having shared TXOP in the frequency domain
Takata et al. A dual access mode MAC protocol for ad hoc networks using smart antennas
US11122624B2 (en) Pre-packet arrival channel contention
KR20200007939A (en) Methods and supporting network nodes supporting multicast / multiuser transmission using listen after talk
US20230199847A1 (en) Fast restricted target wait time update
Karabulut et al. A novel MIMO-OFDM based MAC protocol for VANETs
Tang et al. Medium access control for a wireless LAN with a full duplex AP and half duplex stations
CN115428513A (en) Wireless network multi-point association and multi-path
CN109995477B (en) Intelligent cooperative retransmission method in wireless self-organizing network, and equipment and system thereof
KR20220140814A (en) TS operation for RTA session management
WO2022027500A1 (en) Information sending method, resource determination method and apparatus
CN110099387B (en) Multi-AP information transmission system and transmission method in 6GHz scene
WO2019128192A1 (en) Channel resource allocation method and device thereof in wireless self-organizing network
Kim et al. Cross layer based cooperative communication protocol for improving network performance in underwater sensor networks
Zhai et al. Medium access control protocols in mobile ad hoc networks: problems and solutions

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18896286

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18896286

Country of ref document: EP

Kind code of ref document: A1