WO2016123776A1 - Procédé et appareil de transmission de données - Google Patents

Procédé et appareil de transmission de données Download PDF

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Publication number
WO2016123776A1
WO2016123776A1 PCT/CN2015/072316 CN2015072316W WO2016123776A1 WO 2016123776 A1 WO2016123776 A1 WO 2016123776A1 CN 2015072316 W CN2015072316 W CN 2015072316W WO 2016123776 A1 WO2016123776 A1 WO 2016123776A1
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Prior art keywords
relay device
data
source node
rate
data transmission
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PCT/CN2015/072316
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English (en)
Chinese (zh)
Inventor
韩广林
刘洋
熊新
屈银翔
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201580003158.7A priority Critical patent/CN106233639B/zh
Priority to PCT/CN2015/072316 priority patent/WO2016123776A1/fr
Publication of WO2016123776A1 publication Critical patent/WO2016123776A1/fr

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    • 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

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and apparatus.
  • the source node receives a large amount of data sent by multiple user equipments.
  • the source node and the core network are not interconnected by wired fiber, but need to transmit data through the wireless device.
  • a temporary hotspot such as a stadium, a theater, etc.
  • the source node needs to transmit the massive data sent by the user equipment to the target through the backhaul link (Back haul).
  • the node transmits the massive data sent by the user equipment to the core network by means of the wired fiber connected to the target node. Due to the long distance between the source node and the target node, the data is lost during transmission, making it difficult for the target node to successfully decode the received data.
  • cooperative transmission is often performed by means of a relay device.
  • the related technology combines multiple relay devices into one multicast group. Based on the multicast group, the following two methods are used for data transmission:
  • the first mode the source node selects the worst channel gain from the channel gains of each relay device in the multicast group, and determines the data transmission rate according to the worst channel gain, and then sends the data separately by using the transmission rate.
  • the target node and each relay device in the multicast group When the target node receives the data sent by the source node, it does not directly decode the data, but stores the data.
  • each relay device in the multicast group decodes the received data, and encodes the decoded data according to the original coding mode or a new coding mode to obtain modulated data.
  • the modulated data is then sent to the target node.
  • the target node combines and decodes the data sent by the source node and the modulated data sent by each relay device.
  • the second mode the source node selects the optimal information from the channel gains of the relay devices in the multicast group.
  • the channel gain is determined according to the optimal channel gain, and the data is transmitted to the target node and each relay device in the multicast group by using the data transmission rate.
  • the target node receives the data sent by the source node, it does not directly decode the data, but stores the data.
  • the relay device corresponding to the optimal channel gain in the multicast group decodes the received data, and performs the decoded data according to the original coding mode or a new coding mode. Encoding, obtaining modulated data, and then transmitting the modulated data to the target node.
  • the target node combines and decodes the data sent by the source node and the modulated data sent by the relay device corresponding to the optimal channel gain.
  • the data transmission rate of the source node is determined by the worst channel gain in the multicast group, and the transmission rate is small.
  • Each relay device in the multicast group participates in data transmission, and the diversity gain is large, but the channel capacity is Smaller, spectrum utilization is lower.
  • the transmission rate of the source node is determined by the optimal channel gain in the multicast group, and the transmission rate is large, and the channel capacity is large, but the relay device participating in the coordinated transmission in the multicast group is only the optimal channel.
  • the relay device corresponding to the gain has a small grading gain and a low spectrum utilization rate.
  • an embodiment of the present invention provides a data transmission method and apparatus.
  • the technical solution is as follows:
  • a data transmission apparatus comprising:
  • a receiving rate determining module configured to determine a maximum data receiving rate of each relay device according to channel information, where the channel information includes a channel gain of the source node and the target node, and a channel gain of the source node and each relay device a channel gain of each relay device and the target node, a data transmission power of the source node, a data transmission power of the relay device, and a Gaussian white noise power of the relay device;
  • a transmission rate determining module configured to determine a data transmission rate of the source node according to a maximum data receiving rate of each relay device
  • a device determining module configured to determine a target relay device according to a data transmission rate of the source node
  • a sending module configured to send data to the target node and the target relay device by using a data transmission rate of the source node in a first time slot, where the target relay device is in a second time slot
  • the data is processed to obtain modulated data, and the modulated data is transmitted to the target node.
  • the device further includes:
  • An obtaining module configured to acquire a channel gain of the source node and each relay device
  • a sorting module configured to sort the channel gain of the source node and each relay device from large to small
  • a numbering module configured to number the relay devices corresponding to the channel gain from small to large according to the channel gain order result
  • the receiving rate determining module is configured to determine a maximum data receiving rate of each relay device one by one according to the relay device number.
  • the maximum data receiving rate of each of the relay devices determined by the receiving rate determining module is:
  • V i is the maximum data receiving rate of the i-th relay device
  • N is the number of relay devices
  • P is the data transmission power of the source node
  • P' is the data of the relay device.
  • 2 is the channel gain of the source node and the target node
  • N 0 is the Gaussian white noise power of the relay device.
  • a third possible implementation in the first aspect In conjunction with the second possible implementation of the first aspect, a third possible implementation in the first aspect In the mode, the data transmission rate of the source node determined by the transmission rate determining module is:
  • R is the data transmission rate of the source node.
  • the device determining module is configured to obtain a data receiving rate of each relay device in a first time slot; The data reception rate in one slot is compared with the data transmission rate of the source node; the relay device in which the data reception rate in the first slot is not less than the data transmission rate of the source node is used as the target relay device.
  • a data transmission method comprising:
  • the channel information including a channel gain of the source node and the target node, a channel gain of the source node and each relay device, and each relay device a channel gain of the target node, a data transmission power of the source node, a data transmission power of the relay device, and a Gaussian white noise power of the relay device;
  • the method before the determining, according to the channel information, the maximum data receiving rate of each of the relay devices, the method further includes:
  • the relay devices corresponding to the channel gain are numbered from small to large;
  • Determining, according to the channel information, a maximum data receiving rate of each relay device including:
  • the maximum data reception rate of each relay device is determined one by one according to the relay device number.
  • the determining, by the channel information, the maximum data receiving rate of each of the relay devices is:
  • V i is the maximum data receiving rate of the i-th relay device
  • N is the number of relay devices
  • P is the data transmission power of the source node
  • P' is the data of the relay device.
  • 2 is the channel gain of the source node and the target node
  • N 0 is the Gaussian white noise power of the relay device.
  • the determined data transmission rate of the source node is determined according to a maximum data receiving rate of each relay device.
  • R is the data transmission rate of the source node.
  • determining the target relay device according to the data transmission rate of the source node includes:
  • a relay device having a data reception rate not less than a data transmission rate of the source node in the first time slot is used as a target relay device.
  • the source node determines the maximum data receiving rate of each relay device according to the channel information, and determines the data transmission rate of the source node according to the maximum data receiving rate of each relay device, thereby determining the target relay device, and then determining the target relay device. Transmitting data to the target node and the target relay device by using the data transmission rate of the source node in the first time slot, the target relay device processes the data in the second time slot, and sends the processed data to Target node. Since the data transmission rate of the source node in the present invention is not simply determined by the channel gain of a certain relay device, the maximum data reception rate of the relay device determined by the channel information is determined, thereby ensuring a higher data transmission rate. Under the premise of large, as many relay devices as possible participate in the coordinated transmission process, so that the diversity gain and channel capacity are large, and the spectrum utilization rate is improved.
  • FIG. 1 is a schematic diagram of an implementation environment involved in a data transmission method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a data transmission apparatus according to another embodiment of the present invention.
  • FIG. 4 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 5 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of multi-relay cooperative transmission for a wireless backhaul link according to another embodiment of the present invention.
  • FIG. 7 is a schematic diagram of comparison of spectrum efficiency provided by another embodiment of the present invention.
  • FIG. 1 is a schematic diagram of an implementation environment of coordinated transmission of multiple relay devices according to an embodiment of the present invention.
  • the implementation environment includes a source node, a relay device, and a target node.
  • the source node may be a data source base station or the like in the wireless communication cell, and the target node may be an aggregate base station in the wireless communication cell.
  • the source node has a function of transmitting and transmitting data
  • the relay device has a function of transmitting, decoding, and forwarding data
  • the target node has a function of combining and decoding data.
  • the source node, the relay device, and the target node are all single antenna configurations and operate in a half duplex mode.
  • An embodiment of the present invention provides a data transmission apparatus for performing the data transmission method described in FIG. 4 or FIG. 5 described below.
  • the apparatus includes:
  • the receiving rate determining module 201 is configured to determine, according to the channel information, a maximum data receiving rate of each relay device, where the channel information includes a channel gain of the source node and the target node, a channel gain of the source node and each relay device, and each Channel gain of the relay device and the target node, data transmission power of the source node, data transmission power of the relay device, and Gaussian white noise power of the relay device;
  • a transmission rate determining module 202 configured to determine a data transmission rate of the source node according to a maximum data receiving rate of each relay device
  • the device determining module 203 is configured to determine a target relay device according to a data transmission rate of the source node.
  • the sending module 204 is configured to send data to the target node and the target relay device by using a data transmission rate of the source node in the first time slot, and process the data in the second time slot by the target relay device to obtain modulated data. , the modulated data is sent to the target node.
  • the apparatus further includes:
  • An obtaining module configured to obtain a channel gain of the source node and each relay device
  • a sorting module configured to sort the channel gain of the source node and each relay device from large to small
  • a numbering module configured to number the relay devices corresponding to the channel gain from small to large according to the channel gain order result
  • the receiving rate determining module is configured to determine a maximum data receiving rate of each relay device one by one according to the relay device number.
  • the maximum data receiving rate of each relay device determined by the receiving rate determining module 201 is:
  • V i is the maximum data receiving rate of the i-th relay device
  • N is the number of relay devices
  • P is the data transmission power of the source node
  • P' is the data transmission power of the relay device.
  • 2 is the channel gain of the source node and the target node
  • N 0 is the Gaussian white noise power of the relay device.
  • the data transmission rate of the source node determined by the transmission rate determination module 202 is:
  • R is the data transmission rate of the source node.
  • the device determining module 203 is configured to obtain a data receiving rate of each relay device in a first time slot; and a data receiving rate and a source of each relay device in the first time slot. The data transmission rate of the node is compared; a relay device whose data reception rate is not less than the data transmission rate of the source node in the first time slot is used as the target relay device.
  • the device provided by the embodiment of the present invention determines the maximum data receiving rate of each relay device according to the channel information, and determines the data transmission rate of the source node according to the maximum data receiving rate of each relay device, thereby determining the data transmission rate of the source node.
  • a target relay device after which the data is transmitted to the target node and the target relay device by using the data transmission rate of the source node in the first time slot, and the target relay device processes the data in the second time slot, and The processed data is sent to the target node. Since the data transmission rate of the source node in the present invention is not simply determined by the channel gain of a certain relay device, the maximum data reception rate of the relay device determined by the channel information is determined, thereby ensuring a higher data transmission rate. Under the premise of large, as many relay devices as possible participate in the coordinated transmission process, so that the diversity gain and channel capacity are large, and the spectrum utilization rate is improved.
  • the embodiment of the invention provides a data transmission device.
  • the device includes a processor 301 and a transmitter 302.
  • the processor 301 is configured to determine, according to the channel information, a maximum data receiving rate of each relay device, where the channel information includes a channel gain of the source node and the target node, a channel gain of the source node and each relay device, and each Channel gain of the relay device and the target node, data transmission power of the source node, data transmission power of the relay device, and Gaussian white noise power of the relay device;
  • the processor 301 is further configured to determine a data transmission rate of the source node according to a maximum data receiving rate of each relay device.
  • the processor 301 is further configured to determine, according to a data transmission rate of the source node, a target relay device;
  • the transmitter 302 is further configured to send data to the target node and the target relay device by using a data transmission rate of the source node in the first time slot, and the target relay device processes the data in the second time slot to obtain modulation. Data, the modulated data is sent to the target node.
  • the processor 301 is further configured to acquire channel gains of the source node and each of the relay devices; sort the channel gains of the source node and each of the relay devices from large to small; As a result of the gain sequence, the relay devices corresponding to the channel gains are numbered from small to large; the processor 301 is further configured to determine the maximum data receiving rate of each of the relay devices one by one according to the relay device number.
  • the maximum data reception rate of each relay device determined by the processor 301 is:
  • V i is the maximum data receiving rate of the i-th relay device
  • N is the number of relay devices
  • P is the data transmission power of the source node
  • P' is the data transmission power of the relay device.
  • 2 is the channel gain of the source node and the target node
  • N 0 is the Gaussian white noise power of the relay device.
  • the data transmission rate of the source node determined by the processor 301 is:
  • R is the data transmission rate of the source node.
  • the processor 301 is further configured to acquire a data receiving rate of each relay device in the first time slot; and receive a data receiving rate and a source node of each relay device in the first time slot. The data transmission rate of the point is compared; a relay device whose data reception rate is not less than the data transmission rate of the source node in the first time slot is used as the target relay device.
  • the device provided by the embodiment of the present invention determines the maximum data receiving rate of each relay device according to the channel information, and determines the data transmission rate of the source node according to the maximum data receiving rate of each relay device, thereby determining the data transmission rate of the source node.
  • a target relay device after which the data is transmitted to the target node and the target relay device by using the data transmission rate of the source node in the first time slot, and the target relay device processes the data in the second time slot, and The processed data is sent to the target node. Since the data transmission rate of the source node in the present invention is not simply determined by the channel gain of a certain relay device, the maximum data reception rate of the relay device determined by the channel information is determined, thereby ensuring a higher data transmission rate. Under the premise of large, as many relay devices as possible participate in the coordinated transmission process, so that the diversity gain and channel capacity are large, and the spectrum utilization rate is improved.
  • the embodiment of the present invention provides a data transmission method.
  • the method process provided by the embodiment of the present invention includes:
  • the 401 Determine, according to channel information, a maximum data receiving rate of each relay device, where the channel information includes a channel gain of the source node and the target node, a channel gain of the source node and each relay device, and each relay device and target.
  • the data is sent to the target node and the target relay device by using the data transmission rate of the source node in the first time slot, and the data is processed by the target relay device in the second time slot to obtain modulated data, and the modulated data is modulated. Send to the target node.
  • the source node determines the maximum data receiving rate of each relay device according to the channel information, and determines the source node according to the maximum data receiving rate of each relay device.
  • the data transmission rate, and then the target relay device is determined, and then, in the first time slot, the data transmission rate of the source node is used to transmit data to the target node and the target relay device, and the target relay device is in the second time slot.
  • the data is processed and the processed data is sent to the target node. Since the data transmission rate of the source node in the present invention is not simply determined by the channel gain of a certain relay device, the maximum data reception rate of the relay device determined by the channel information is determined, thereby ensuring a higher data transmission rate. Under the premise of large, as many relay devices as possible participate in the coordinated transmission process, so that the diversity gain and channel capacity are large, and the spectrum utilization rate is improved.
  • the method before determining the maximum data receiving rate of each relay device according to the channel information, the method further includes:
  • the relay devices corresponding to the channel gain are numbered from small to large;
  • the maximum data reception rate of each relay device is determined one by one according to the relay device number.
  • the maximum data reception rate of each relay device determined according to the channel information is:
  • V i is the maximum data receiving rate of the i-th relay device
  • N is the number of relay devices
  • P is the data transmission power of the source node
  • P' is the data transmission power of the relay device.
  • 2 is the channel gain of the source node and the target node
  • N 0 is the Gaussian white noise power of the relay device.
  • the determined data transmission rate of the source node is based on the maximum data reception rate of each relay device:
  • R is the data transmission rate of the source node.
  • determining the target relay device according to the data transmission rate of the source node includes:
  • a relay device in which the data reception rate in the first time slot is not less than the data transmission rate of the source node is used as the target relay device.
  • the embodiment of the present invention provides a method for number transmission.
  • the process of the method provided in this embodiment includes:
  • the source node determines a maximum data receiving rate of each relay device according to the channel information.
  • each relay device has a maximum data reception rate, which is a basis for the relay device to successfully decode the received data.
  • the relay device cannot successfully decode the received data; when the data transmission rate of the source node is smaller than the maximum data reception rate of the relay device, The relay device can successfully decode the received data, and after the relay device successfully decodes the received data, the relay device can participate in the data transmission, that is, the data transmission rate and the relay of the source node.
  • the maximum data reception rate of the device itself determines which relay devices can perform coordinated transmission.
  • the number of relay devices participating in coordinated transmission in the scenario of coordinated transmission of multiple relay devices The quantity directly affects the diversity gain of the data transmission system, which in turn affects the spectrum utilization. Therefore, in order to improve the spectrum utilization, the data transmission method provided in this embodiment also needs to determine the maximum data reception rate of each relay device.
  • channel information can accurately reflect the actual communication status of each device in the data transmission system, and the actual communication status of each device in the data transmission system directly determines the maximum data reception rate of the relay device.
  • the node may first obtain channel information of the data transmission system, and then determine a maximum data receiving rate of each relay device according to the acquired channel information.
  • the channel information includes at least a channel gain of the source node and the target node, a channel gain of the source node and each relay device, a channel gain of each relay device and the target node, a data transmission power of the source node, and a relay device. Data transmission power and Gaussian white noise power of the relay device.
  • Channel gain is used as a channel coefficient to describe the attenuation and fading characteristics of a channel.
  • Gaussian white noise is a kind of noise form that is subjected to Gaussian distribution and power density is evenly distributed.
  • the channel information is stored in the storage unit of the source node, and the channel information is obtained through testing. Therefore, when acquiring the channel information, the source node can directly obtain from the corresponding storage unit.
  • the source node obtains the source node and each relay from the channel information before determining the maximum data reception rate of each relay device according to the channel information.
  • the channel gain of the device, and the channel gain of the source node and each relay device are sorted from large to small, and the channel gain ranking result is obtained, and based on the channel gain order result, the relay device corresponding to the channel gain is small to large. Numbered.
  • the relay devices in the data transmission system are the relay device A, the relay device B, the relay device C, and the relay device D. If the channel gain of the source node and the relay device A is 10 dB, the source node and the relay The channel gain of the device B is 20 dB, the channel gain of the source node and the relay device C is 15 dB, and the channel gain of the source node and the relay device D is 25 dB, and the channel gain of the source node and each relay device is as large as The small ordering is: 25dB, 20dB, 15dB, 10dB. According to the channel gain order result, the relay devices corresponding to the channel gain are numbered from small to large, and the number that can be set for the relay device D is 1. The number set for the relay device B is 2, the number set for the relay device C is 3, and the number set for the relay device A is 4.
  • the source node determines the maximum data reception rate of each relay device according to the channel information, and can determine one by one according to the relay device number.
  • the relay device in the data transmission system is the relay device A, the relay device B, and the relay device C.
  • the number of the relay device A is 2
  • the number of the relay device B is 1
  • the number of the relay device C is If the value is 3, the maximum data receiving rate of each relay device is determined according to the number of each relay device.
  • the maximum data receiving rate of the relay device B is determined first, and then the maximum data receiving rate of the relay device A is determined. Finally, the maximum data reception rate of the relay device C is determined.
  • the data from the source node to the target node will experience two levels of hopping.
  • the process of sending the data to the relay device by the source node is called a first hop, and the relay device forwards the data to the target node.
  • the process is called the second level jump.
  • the time slot used when the source node transmits data is referred to as a first time slot
  • the time slot used when the target relay device transmits data is referred to as a second time slot.
  • the first time slot and the second time slot may be two consecutive time slots, or may be two consecutive time slots, which is not specifically limited in this embodiment.
  • the channel capacity of the source node to a certain relay node and the channel capacity of the relay node to the target node are often different.
  • the maximum capacity of the source node to a certain relay channel does not mean that the channel capacity of the relay to the target node is also the largest.
  • the relay In the first time slot, if the rate at which the source node sends data is greater than the channel capacity of it and a certain relay, the relay cannot successfully decode the data sent by the source node.
  • the data received by the target node is the channel capacity sum from multiple relays.
  • the minimum rate of the two-level hop is required as the maximum data reception rate of the relay device.
  • V i is the maximum data receiving rate of the i-th relay device
  • N is the number of relay devices
  • P is the data transmission power of the source node
  • P' is the data transmission power of the relay device.
  • 2 is the channel gain of the source node and the target node
  • N 0 is the Gaussian white noise power of the relay device.
  • the relay device in the data transmission system is the relay device A, the relay device B, the relay device C, the relay device D, and the relay device E.
  • the source node determines The data receiving rate of the relay device A in the first time slot is 2, the data receiving rate of the relay device B in the first time slot is 4, and the data receiving rate of the relay device C in the first time slot is 5, The data receiving rate of the device D in the first time slot is 6, and the data receiving rate of the relay device E in the first time slot is 7.
  • the source node determines that the relay device A is in the second time.
  • the sum of the data transmission rates of the slots is 4, the sum of the data transmission rates of the relay device B in the second time slot is 7, and the sum of the data transmission rates of the relay device C in the second time slot is 8, the relay device D
  • the sum of the data transmission rates of the second time slot is 9, and the sum of the data transmission rates of the relay device E in the second time slot is 10, and finally the maximum data reception rate of the relay device A can be determined to be 2
  • the maximum data reception rate of device B is 4, the maximum data reception rate of relay device C is 5, and the maximum of relay device D is 6 is a data reception rate, the maximum rate of data reception to the relay device E 7.
  • the source node determines a data transmission rate of the source node according to a maximum data receiving rate of each relay device.
  • the source node After determining the maximum data receiving rate of each relay device according to the channel information, the source node also determines the source node according to the maximum data receiving rate of each relay device.
  • the data transmission rate of the source node is the data transmission rate used by the source node to transmit data during data transmission.
  • the data transmission rate of the source node has an important influence on the diversity gain of the data transmission system.
  • the number of relay devices successfully decoded by the source node is more.
  • the more the number of relay devices participating in data cooperative transmission the greater the diversity gain of the data transmission system in the second time slot.
  • the data transmission rate of the source node is large, the data transmitted by the source node is successfully decoded.
  • the source node traverses the data receiving rate of all the relay devices and selects the maximum data receiving rate of all the relay devices.
  • the larger value is used as the data transmission rate of the source node.
  • the maximum value can be selected from the maximum data reception rate of all relay devices as the data transmission rate of the source node.
  • the following formula (2) can be employed.
  • R is the data transmission rate of the source node.
  • the relay device in the data transmission system is the relay device A, the relay device B, the relay device C, the relay device D, and the relay device E.
  • the source node determines the maximum of the relay device A.
  • the data receiving rate is 2
  • the maximum data receiving rate of the relay device B is 3
  • the maximum data receiving rate of the relay device C is 4
  • the maximum data receiving rate of the relay device D is 5
  • the maximum data receiving of the relay device E is The rate is 6, and since the maximum data reception rate of the relay device E is the largest among the maximum data reception rates of all the relay devices, it can be determined that the data transmission rate of the source node of the source node is 6.
  • the above takes the maximum data receiving rate selected by all the relay devices as the data transmission rate of the source node.
  • a threshold range may also be set, and the difference between the selected maximum data receiving rate and the selected data receiving rate may be The data reception rate within the preset range is used as the data transmission rate of the source node.
  • the source node determines the target relay device according to the data transmission rate of the source node.
  • the target relay device is a relay device that participates in data transmission during data transmission.
  • the data receiving rate of each relay device in the first time slot may be acquired first, and each relay device is in the first time slot.
  • the data reception rate in the first node is compared with the data transmission rate of the source node, and the relay device whose data reception rate is not less than the data transmission rate of the source node in the first time slot is used as the target relay device.
  • the relay device in the data transmission system is the relay device A, the relay device B, the relay device C, the relay device D, and the relay device E.
  • the source node determines that the relay device A is in the first
  • the data reception rate of one slot is 2, the data reception rate of the relay device B in the first slot is 4, the data reception rate of the relay device C in the first slot is 5, and the relay device D is at the first time.
  • the data receiving rate of the slot is 6, and the data receiving rate of the relay device E in the first time slot is 7. If the maximum data receiving rate of each relay device in the data transmission system is determined, the data transmission rate of the source node is determined as 6.
  • the relay device D and the relay device E are used as target relay devices.
  • This process can be determined by formula (3) when it is implemented.
  • L * is the number of target relay devices.
  • steps 501 to 503 are processes for determining the data transmission rate of the data transmitted by the source node and determining the relay device participating in the coordinated transmission, and the process does not need to be repeatedly executed in each data transmission process, only at the source.
  • the channel information acquired by the node changes, that is, the channel gain of the source node and the target node, the channel gain of the source node and each relay device, the channel gain of each relay device and the target node, and the data transmission power of the source node, When at least one of the data transmission power of the device and the Gaussian white power of the relay device changes, the above steps 501 to 503 are re-executed.
  • the source node sends data to the target node and the target relay device by using a data transmission rate of the source node in the first time slot.
  • the source node will transmit the data to each target node and the target relay in the first time slot at the data transmission rate of the source node. Ready.
  • the target node stores the received data.
  • the target node when the target node receives the data sent by the source node in the first time slot, it does not directly decode the received data, but stores the received data, and in subsequent steps. After receiving the data transmitted by the relay device through the second time slot, the received data is combined and decoded.
  • the target relay device When receiving data sent by the source node in the first time slot, the target relay device processes the data in the second time slot to obtain modulated data.
  • the target relay device When the source node sends data to the relay device using the data transmission rate of the source node, not every relay device can successfully decode the received data.
  • the relay device that can successfully decode only has a maximum data transmission rate greater than The target relay device of the data transmission rate of the source node. Based on the received data, the target relay device first decodes the received data to obtain decoded data, and then encodes the decoded data by using the original encoding method or a new encoding method to obtain modulated data. In addition, the target relay device can effectively eliminate the noise data in the data by processing the data in the second time slot.
  • step 505 the process of storing the received data by the target node and the process of processing the received data by the target relay device in step 506 are performed simultaneously, and in this embodiment, only the storage from the target node is received.
  • the target relay device processes the received data as step 506.
  • the above step 505 and the above step 506 do not represent a specific execution sequence.
  • the target relay device sends the modulated data to the target node in the second time slot.
  • the target relay device After the modulated data is obtained, the target relay device will transmit the modulated signal to the target node in the second time slot using the data transmission rate of the source node.
  • the target node performs combined decoding on the data received in the first time slot and the modulated data received in the second time slot.
  • the target node When receiving the modulated data transmitted by the target relay device in the second time slot, the target node will be at the first The data received in the time slot and the modulated data received in the second time slot are combined and decoded to obtain a diversity enhanced data.
  • FIG. 6 is a schematic diagram of wireless multi-relay coordinated transmission for a wireless backhaul link, where the source node is a data source base station, the number of relay devices is N, and the channel gains of the source node and the N relay devices are respectively h SR1 , h SR2 , h SR3 , . . . , h SRN , the target node is an aggregate base station, the channel gain of the data source base station and the aggregate base station is h sd , and the channel gains of the N relay devices and the aggregate base station are respectively h R1d , h R2d , h R3d , . . . , h RNd .
  • the source node determines from the N relay devices that the target relay device is the first L relay devices.
  • the data source base station sends the user data to the aggregation base station and the L relay devices in the first time slot, and the L target relay devices receive the second time slot in the second time slot.
  • the user data is decoded, and the decoded data is re-encoded, and then the re-encoded data is sent to the aggregation base station in the second time slot, and the aggregated base station receives the data and the second time slot in the first time slot.
  • the received data is combined and decoded to obtain hierarchically enhanced data.
  • the present invention will also show the spectrum utilization curve obtained by using different data transmission methods.
  • curve 1 is a spectrum utilization curve obtained by using the data transmission method provided by the present invention
  • curve 2 adopts a spectrum utilization curve obtained by direct transmission
  • curve 2 is a coordinated transmission method using all relay devices.
  • the spectrum utilization curve is obtained
  • curve 3 is the spectrum utilization curve obtained by the cooperative transmission method of the relay device.
  • the number of relay devices in the simulation process is 10. It can be seen from FIG. 7 that the spectrum utilization rate is the highest when data transmission is performed by the method provided by the present invention.
  • the source node determines the maximum data receiving rate of each relay device according to the channel information, and determines the data transmission rate of the source node according to the maximum data receiving rate of each relay device, and further Determining the target relay device, and then transmitting data to the target node and the target relay device by using the data transmission rate of the source node in the first time slot, and the target relay device is in the second
  • the data is processed in the time slot and the processed data is sent to the target node. Since the data transmission rate of the source node in the present invention is not simply determined by the channel gain of a certain relay device, the maximum data reception rate of the relay device determined by the channel information is determined, thereby ensuring a higher data transmission rate. Under the premise of large, as many relay devices as possible participate in the coordinated transmission process, so that the diversity gain and channel capacity are large, and the spectrum utilization rate is improved.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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

Abstract

L'invention concerne un procédé et un appareil de transmission de données s'inscrivant dans le domaine technique des communications sans fil. Le procédé consiste à : selon des informations concernant un canal, déterminer un débit de réception de données maximal de chaque dispositif de relais ; selon le débit de réception de données maximal de chaque dispositif de relais, déterminer un débit de transmission de données d'un nœud source ; selon le débit de transmission de données du nœud source, déterminer un dispositif de relais cible ; et dans un premier créneau temporel, envoyer des données à un nœud cible et au dispositif de relais cible par utilisation du débit de transmission de données du nœud source. Le débit de transmission de données du nœud source dans la présente invention ne dépend pas simplement d'un gain de canal d'un dispositif de relais mais est déterminé par le débit de réception de données maximal du dispositif de relais déterminé par les informations de canal, de telle sorte que, à condition de garantir un débit de transmission de données relativement élevé du nœud source, de multiples dispositifs de relais peuvent participer autant que possible à un processus de transmission coopératif, de telle sorte que le gain de diversité et la capacité de canal sont relativement élevés, et le taux d'utilisation de spectre de fréquences est accru.
PCT/CN2015/072316 2015-02-05 2015-02-05 Procédé et appareil de transmission de données WO2016123776A1 (fr)

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CN101931438A (zh) * 2009-06-26 2010-12-29 华为技术有限公司 一种协作节点选择方法及装置
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