WO2012130076A1 - Système de programmation, dispositif réseau, et dispositif terminal - Google Patents

Système de programmation, dispositif réseau, et dispositif terminal Download PDF

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Publication number
WO2012130076A1
WO2012130076A1 PCT/CN2012/072784 CN2012072784W WO2012130076A1 WO 2012130076 A1 WO2012130076 A1 WO 2012130076A1 CN 2012072784 W CN2012072784 W CN 2012072784W WO 2012130076 A1 WO2012130076 A1 WO 2012130076A1
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WIPO (PCT)
Prior art keywords
channel
scheduling
uplink
downlink
information
Prior art date
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PCT/CN2012/072784
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English (en)
Chinese (zh)
Inventor
鲍东山
王竞
刘慎发
曾勇波
周玉宝
闫志刚
王飞飞
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Beijing Nufront Wireless Tech Co Ltd
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Beijing Nufront Wireless Tech Co Ltd
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Priority claimed from CN 201110080637 external-priority patent/CN102761966A/zh
Application filed by Beijing Nufront Wireless Tech Co Ltd filed Critical Beijing Nufront Wireless Tech Co Ltd
Priority to CN201280013011.2A priority Critical patent/CN103430610B/zh
Publication of WO2012130076A1 publication Critical patent/WO2012130076A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the application date is March 25, 2011, and the application number is 201110074598.5.
  • the invention name is the priority of the prior art application for the method and system for adjusting the demodulation pilot in the wireless communication system, and the application date is March 2011.
  • the application number is 201110080637.2
  • the invention name is a prioritization of a scheduling method, a wireless communication system and equipment
  • the application date is May 19, 2011, and the application number is 201110130194.3
  • the invention name is a
  • the priority of the prior application of the communication system, and the application date is February 16, 2012
  • the application number is 201210035784.2
  • the invention name is the priority of a prior application of a scheduling method, a network device, and a terminal device, All of the content of the first application has been embodied in this application.
  • the present invention relates to wireless communication, or particularly to a wireless communication or, in particular, to a scheduling method, a network device, and a terminal device.
  • wireless communication systems for medium and short communication distances include 802.11-based wireless LAN WiFi technology, 802.15-based Bluetooth Bluetooth system, and Femto technology for indoor applications generated by mobile communication systems.
  • 802.11-based WiFi technology is one of the most widely used wireless network transmission technologies today. It is mainly used in wireless office i or network environments. The application scenarios are mostly indoors and can also be applied to outdoor environments.
  • the 802.11 system evolved from the original CDMA transport mechanism based 802.11 b to OFDM technology based 802.11 a and 802.11 g. In the latest 802.11 ⁇ version, by introducing multiple antennas
  • CAP access point
  • STA Station
  • the CSMA/CA mechanism Through the CSMA/CA mechanism, the right to use wireless resources is competed, and at the same time, the wireless channel is competed, and collision occurs at this time, resulting in waste of wireless resources.
  • the CSMA/CA mechanism requires that the CAP or STA need to randomly retreat when competing for the wireless channel. When all CAPs and STAs are backed off, the wireless channel is idle but not used, which is also for wireless. Great waste of the channel. For the above reasons, 802.11 systems are less efficient.
  • 802.11 g system physical layer peak rate of up to 54Mbps, but the TCP layer under the large packet download service (for example: FTP Download) reachable rate is not higher than 30Mbps (in the small packet service, due to the increase in the proportion of overhead, The peak rate is 4 ⁇ ).
  • the 802.11 system is flexible and does not rely on a centralized control mechanism, so it can also achieve lower equipment costs.
  • the Femto technology based on the 3GPP standard is a new technology for indoor coverage that has evolved from a mobile communication system. Based on the statistics of 3G systems, about 70% of data services occur indoors, so indoor high-speed data access solutions are especially important.
  • the Femto base station called the micro-base station, is compact (similar to Wi-Fi) and flexible to deploy. Due to the evolution from mobile communication systems, Femto base stations have inherited almost all the characteristics of mobile communication systems.
  • the Femto device combines its limited coverage and fewer application scenarios such as access users to reduce the processing power of the device and reduce the cost of the device.
  • the duplex mode like the mobile communication system, the Femto base station can be divided into two types of duplex mechanisms: FDD and TDD.
  • the uplink and downlink carrier resources of the FDD are symmetric, and the asymmetric service characteristics of the uplink and downlink data traffic of the data service make the FDD system have a certain waste of resources when facing the data service.
  • the uplink and downlink of the TDD system work on the same carrier, and the time resources are allocated to allocate different radio resources to the uplink and downlink. Therefore, the FDD can better adapt to the asymmetric data services of the uplink and downlink services.
  • the TDD duplex mode of mobile communication systems including Femto system
  • static allocation of uplink and downlink resources and various types of data services with different needs, such as: browsing web pages, mobile video, mobile games, M2M (machine-to-machine )
  • M2M machine-to-machine
  • Wi-Fi because Femto uses a scheduling-based centralized control mechanism, there is no waste of radio resources between the base station or CAP and the terminal or terminal due to collision and random backoff, so the link efficiency is high.
  • Femto technology its multiple access mechanism allocates mutually orthogonal access resources for different STAs by time, frequency and codeword, which is essentially different from the competitive CSMA/CA random multiple access.
  • Femto technology requires a centralized control node to allocate mutually orthogonal radio resources to STAs. Different STAs can simultaneously transmit air interface resources by time, frequency, codeword or even space.
  • the Femto technology based on the 3G system uses the CDMA transmission mechanism
  • the Femto technology for the LTE or WiMAX system uses the OFDM transmission mechanism. Since OFDM technology is the mainstream technology for future broadband wireless communication systems, the Femto technologies mentioned in the present invention all refer to LTE or WiMAX Femto. Since TDD technology can better adapt to the uplink and downlink asymmetric services of the mobile Internet than the FDD technology, the Femto mentioned in the present invention mainly refers to the TDD Femto technology.
  • the Femto system also allocates radio resources for different terminals by scheduling uplink and downlink communication
  • its statically configured frame structure cannot flexibly allocate radio resources for uplink and downlink, and cannot adapt to service changes with small granularity.
  • the resource configuration is out of balance, it may cause long-term queuing, the user experience is reduced, or the channel capacity is wasted.
  • CSMA/CA is a multi-access mechanism for competition. Inevitably there will be conflicts in the system. If two or more terminals, or between the terminal and the CAP When it comes to air interface, neither party will compete for success. This is the conflict. Obviously, the conflict of competition is undoubtedly a waste of air resources. Once the conflict is struck, in order to avoid the conflict again, all parties to the competition will initiate a random retreat. In the backoff process, there will be multiple situations where the competing nodes are waiting.
  • the scheduling period is 1 ms as the minimum configuration unit.
  • the asymmetry characteristics of the upper and lower services are inconsistent, and the statically configured frame format cannot adapt to the needs of various data services.
  • the service characteristics change there will be some redundancy or shortage of the uplink and downlink resources of the initial configuration. This will not only waste wireless resources, but also increase service delay.
  • the radio resources are allocated to different terminals by scheduling uplink and downlink communication, the statically configured frame structure cannot flexibly allocate radio resources for uplink and downlink, and cannot adapt to service changes with small granularity. When services and resources When the configuration is unbalanced, it may cause long-term queuing, the user experience is reduced, or the channel capacity is wasted.
  • the technical problem to be solved by the present invention is to provide a scheduling method, a network device, and a terminal device, so as to dynamically divide uplink and downlink wireless transmission resources based on service requirements, and also better adapt to future types. And different data business needs.
  • a summary of the cartridge is given below. This generalization is not a general comment, nor is it intended to identify key/critical elements or to describe the scope of protection for these embodiments. Its sole purpose is to present some concepts in the form of a single sheet as a prelude to the detailed description that follows.
  • the present invention provides a scheduling method, including: acquiring scheduling information;
  • the uplink scheduling period and the downlink scheduling period are calculated according to the transmission resources scheduled in the frame.
  • the structure of the current frame is determined according to the uplink scheduling period, the downlink scheduling period, and the guard interval.
  • the structure of the current frame is broadcasted, and scheduling signaling is sent.
  • the present invention further provides a network device, including: an acquiring unit, configured to acquire scheduling information; a scheduling unit, configured to schedule a transmission resource according to the scheduling information;
  • a determining unit configured to calculate an uplink scheduling period and a downlink scheduling period according to the transmission resource scheduled in the intraframe; and determine a structure of the current frame according to an uplink scheduling period, a downlink scheduling period, and a guard interval; and a broadcast unit, configured to broadcast the current frame And a sending unit, configured to send downlink scheduling signaling.
  • the present invention further provides a terminal device, including: a receiving unit, configured to receive structural information and scheduling signaling of the current frame;
  • a determining unit configured to determine a structure of the frame according to the structural information of the frame, and determine allocation of the resource according to the scheduling signal.
  • the STA allocates radio resources to avoid the waste of radio resources caused by the competition mechanism.
  • the invention can not only adapt to the large service rate change of different terminals, but also adapt to the dynamic changes of the wireless channel.
  • the invention can better adapt to the dynamic changes of various data service requirements, dynamically match the channel capacity with the service demand, and obtain better system efficiency. It can weigh the service requirements and channel characteristics, dynamically divide the uplink and downlink resources, and dynamically allocate radio resources for different terminals under the condition of link adaptation.
  • the present invention also considers the state information delay of the channel, the processing time requirements of different class devices, and the like. All of the above considerations can improve system efficiency and performance.
  • This frame feedback can be implemented to reduce the feedback delay of MU-MIMO.
  • This frame scheduling can be implemented, which reduces the scheduling delay of the service.
  • the frame structure is flexible and can adapt to the uplink and downlink transmission requirements of various data services. There is no fixed frame length or frame period constraint. At the same time, the system allows the uplink and downlink scheduling transmission period to adapt to the change of the uplink and downlink service requirements, and can adapt the service demand to the uplink and downlink channel capacity to obtain higher resource utilization.
  • the scheduling period can adapt to changes in the time-selective fading of the wireless channel, avoiding unnecessary Control overhead caused by frequent scheduling;
  • the system allows the frame length to be dynamically adjusted to adaptively time-selective fading of the wireless channel, which can match the system scheduling period with the wireless channel, thereby reducing the control overhead caused by frequent scheduling.
  • FIG. 1 is a schematic flow chart of a scheduling method provided by the present invention
  • FIG. 2 is a schematic diagram of a frame structure according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic flow chart of a scheduling method applicable to downlink scheduling according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic diagram of a frame structure for measuring the quality of a downlink transmission channel by an CAP through an uplink sounding channel according to Embodiment 3 of the present invention
  • FIG. 5 is a frame structure of a quality scheduling downlink transmission of a CAP through an uplink feedback channel according to Embodiment 4 of the present invention
  • FIG. 6 is a schematic flow chart of a scheduling method applicable to uplink scheduling according to Embodiment 5 of the present invention.
  • FIG. 7 is a schematic diagram of a frame structure of an uplink scheduling transmission process when the state/quality information of the CAP unknown uplink channel and the bandwidth requirement are provided according to the sixth embodiment of the present invention
  • FIG. 8 is a schematic diagram of the CAP provided by the seventh embodiment of the present invention.
  • FIG. 9 is a block diagram of a device for a network device according to Embodiment 8 of the present invention
  • FIG. 10 is a block diagram of a device for a terminal device according to Embodiment 9 of the present invention
  • FIG. 11 is a schematic diagram of a frame structure of an uplink and downlink scheduling transmission process provided by an application example of the present invention. detailed description
  • Step S101 Obtain scheduling information.
  • Step S102 Scheduling transmission resources according to the scheduling information.
  • the scheduling information includes scheduling requirements of each receiving device, or scheduling requirements of different service flows of each receiving device.
  • Step S103 Calculating an uplink scheduling according to the transmission resources scheduled in the frame. Cycle and downlink scheduling cycles;
  • Step S104 Determine a structure of the current frame according to an uplink scheduling period, a downlink scheduling period, and a guard interval.
  • Step S105 Broadcast the structure of the current frame, and send scheduling signaling.
  • the scheduling signaling is used to indicate allocation of transmission resources.
  • the calculation of the downlink scheduling period includes: acquiring downlink scheduling information; scheduling downlink transmission resources according to the downlink scheduling information; and calculating a downlink scheduling period according to the downlink transmission resources scheduled in the intraframe.
  • the scheduling the downlink transmission resource according to the downlink scheduling information may include: scheduling the downlink transmission channel according to the downlink scheduling information.
  • the downlink transport channel is used to transmit one or more of downlink services, signaling, and feedback information.
  • the downlink transmission resource can be scheduled according to the quality information and/or the state information of the downlink transmission channel. Therefore, the present invention is designed to: firstly: schedule an uplink sounding channel for the STA to send an uplink sounding signal according to the downlink scheduling information; Calculating the quality and/or state of the uplink transmission channel by measuring the detection signal of the uplink sounding channel, determining the quality and/or state of the downlink transmission channel based on the upper and lower reciprocity of the system; combining the quality information of the downlink transmission channel and / or status information to schedule downlink transmission resources.
  • Manner 2 scheduling, according to the downlink scheduling information, a downlink sounding channel for the CAP to send the downlink sounding signal; and scheduling an uplink transport channel for the STA to feed back the quality and/or state of the downlink transport channel measured according to the downlink sounding signal;
  • the downlink transmission resource is scheduled in combination with the quality and/or state of the downlink transmission channel obtained by the feedback.
  • the calculation of the uplink scheduling period includes: acquiring uplink scheduling information; scheduling uplink transmission resources according to the uplink scheduling information; and calculating an uplink scheduling period according to the uplink transmission resources scheduled in the frame.
  • the scheduling the uplink transmission resource according to the uplink scheduling information may include: according to the foregoing
  • the line scheduling information schedules an uplink transmission channel.
  • the uplink transport channel is used to transmit one or more of uplink traffic, signaling, and feedback information.
  • the uplink transmission resource can be scheduled in combination with the quality information and/or the state information of the uplink transmission channel. Therefore, the present invention is to provide: an uplink detection channel for the STA to send an uplink sounding signal according to the uplink scheduling information; The quality and/or state of the uplink transport channel is calculated by measuring the sounding signal of the uplink sounding channel; and the uplink transmission resource is scheduled according to the quality information and/or the state information of the uplink transport channel.
  • Manner 2 scheduling, according to the uplink scheduling information, a downlink sounding channel for the CAP to send the downlink sounding signal; and scheduling an uplink transport channel for the STA to feed back the quality and/or state of the downlink transport channel measured according to the downlink sounding signal; Obtaining the quality and/or state of the downlink transmission channel through feedback, determining the quality and/or state of the uplink transmission channel based on the upper and lower reciprocity of the system, and scheduling the uplink transmission resource according to the quality and/or state of the uplink transmission channel .
  • the system information channel and the control channel are also scheduled:
  • the scheduling signaling is sent through a control channel.
  • the method may also include broadcasting the frame length of the current frame.
  • the structure and/or frame length of the frame is broadcast over the system information channel, or the system information channel and the control channel, or other channels.
  • the method of the present invention does not have a waste of radio resources caused by competition conflict or random backoff.
  • the system can dynamically divide uplink and downlink wireless resources based on service requirements, and can dynamically adapt to future kinds of data services with various characteristics and different characteristics. demand.
  • the transmitted communication frame in the present invention is based on the TDD duplex mode (on a fixed carrier, the base station or the CAP and the terminal or the STA completes the reception and transmission by the transmission and reception conversion time division), and each TDD frame (Frame) includes Downlink (DL, Downlink, from base station to terminal or from CAP to STA direction) transmission and uplink (UL, Uplink, from terminal to base station or from STA to CAP direction) transmit two parts, but downlink transmission and uplink transmission period can be dynamic Configuration, and thus each TDD frame period can also be dynamically changed.
  • FIG. 2 is a schematic diagram of a frame structure provided by Embodiment 1. As shown in Fig. 2, the abscissa represents time and the ordinate represents frequency.
  • Each frame includes a downlink subframe and an uplink subframe, and the downlink subframe and the uplink subframe are divided into different channels according to functions, and each channel is divided into different fields according to functions.
  • the downlink subframe is divided into a preamble sequence, a system information channel, and a control channel, and a downlink guard interval DGI and an uplink guard interval UGI are provided between the downlink subframe and the uplink subframe, and the downlink guard interval is
  • DGI is the downlink-to-uplink transmission and reception protection interval
  • UGI is the uplink-to-downlink transmission and reception protection interval
  • DGI and UGI configurations are indicated by periodic broadcast messages of the system information channel.
  • the starting position of each frame is a Preamble preamble sequence, and the preamble sequence can be divided into a short preamble sequence and a long preamble sequence.
  • the short preamble sequence is mainly used for system coarse synchronization, and is also used for frame detection, automatic gain control, coarse frequency synchronization or coarse symbol synchronization.
  • the long preamble sequence is mainly used for system fine synchronization and channel estimation, and is also used for fine frequency synchronization. Fine symbol synchronization, etc.
  • the system information channel can not only broaden the basic system configuration, such as frequency band configuration, antenna configuration and frame number, but also broadcast the frame structure configuration of the frame, for example: configuration or period of each channel or part of the channel, structure and/or frame length
  • the configuration of the control channel period, the downlink transmission channel period, the uplink transmission channel period, the auxiliary channel (downlink sounding channel, uplink sounding channel, uplink scheduling request channel, uplink random access channel) and the guard interval are indicated by the system information channel. Configuration, etc.
  • the frame structure configuration By detecting the frame structure configuration, all the terminal devices associated with the network device can obtain the structure of the frame, or obtain the structure and frame length of the frame.
  • the control channel carries signaling information indicating uplink and downlink scheduling transmission, and indicates downlink and uplink transmission channel resource allocation and transmission formats.
  • the downlink subframe may also include a downlink transport channel for the network device to transmit downlink service data and/or control signaling to the terminal device. Downlink traffic scheduling transmission and/or downlink signaling scheduling transmission are performed on the downlink transmission channel.
  • the downlink subframe may also include a downlink sounding channel, and the downlink sounding channel is used for quality/state measurement and estimation of the downlink channel.
  • the uplink subframe may include an uplink transport channel for the terminal device to transmit uplink data services and/or feedback information to the network device. Uplink traffic scheduling transmission and/or uplink feedback scheduling transmission are performed on the uplink transmission channel.
  • the uplink subframe may further include one or more of an uplink sounding channel, an uplink scheduling request channel, and an uplink random access channel;
  • the uplink sounding channel is used for quality/state measurement and estimation of the uplink channel; the uplink scheduling request channel is used for the terminal device to trigger the uplink scheduling request or the uplink fast feedback; the uplink random access channel is used for the initial access of the terminal device, or the terminal device scheduling request .
  • FIG. 2 only exemplifies an example of a frame structure including all auxiliary channels. In actual situations, depending on the system application scenario or scheme, some auxiliary channels (downlink sounding channel, uplink sounding channel, uplink scheduling request channel, or uplink) Random access channel) can also be ignored.
  • the auxiliary channel and the uplink transmission channel use a time division multiplexing transmission mode.
  • the frequency division or code division multiplexing of the auxiliary channel and the uplink and downlink transmission channels or the combined multiplexing of time division, frequency division or code division can also be implemented.
  • the system information channel and the control channel adopt time division multiplexing mode, and can also implement combined multiplexing of system information channel and control channel frequency division, code division or time division, frequency division or code division, and specific resource allocation is indicated by the control channel. .
  • the downlink sounding channel can be located at both ends or in the middle of the downlink transport channel. As shown in FIG. 2, only the downlink sounding channel is listed behind the downlink transport channel, and may be in the middle or the middle of the downlink transport channel, and may be multiple-input multiple-out-put (MU-MIMO).
  • MU-MIMO multiple-input multiple-out-put
  • the performance of the downlink MU-MIMO system is not only sensitive to the state information delay of the downlink channel, but also the multi-user MIMO involves a large signal processing complexity. Considering the state information delay of the channel and the hardware processing complexity that may be different in different application scenarios, it is more reasonable that the downlink sounding channel is located in the middle of the downlink transmission channel.
  • the specific location of the downlink sounding channel on the downlink transport channel is indicated by the periodic broadcast message of the system information channel. If the downlink sounding channel is fixed in position, it can be used to indicate the presence or absence of the downlink sounding channel with 1 bit in the system information channel. If there are terminal devices with different processing capabilities in the system, the downlink sounding channel position is variable. In this case, not only the presence or absence of the downlink sounding channel, the period and the location, but also the two downlink transmission channel periods need to be indicated in the system information channel.
  • the two downlink transmission channel period indications can be used in the following three ways:
  • the total period of the downlink transmission channel and the period of the downlink transmission channel two are respectively indicated.
  • the downlink sounding channel position is set by the above dynamic or semi-static setting to provide sufficient processing time for devices with different processing capabilities.
  • the frame structure can be indicated by bit bits in the system information channel, that is, the presence and absence of each channel and the period are indicated.
  • 6 bits are used to indicate the control channel period, the maximum 63 OFDM symbols, the minimum resource allocation unit: 1 OFDM symbol; 9 bits indicates the downlink transmission channel period, and the maximum 512 OFDM symbols (including dedicated demodulation) Pilot;); 9bits indicating the uplink transmission channel period, the maximum 512 OFDM symbols (including dedicated demodulation pilot); 1 bit indicating the guard interval DGI, a total of 1 OFDM symbol; 2bits indicating the probing channel configuration, respectively indicating 0, 1, 2, 4 OFDM symbols; 2bits indicating the uplink scheduling request channel configuration, respectively indicating 1, 2, 3, 4 OFDM symbols; 1 bit indicating the uplink random access channel configuration, respectively indicating with or without two The case; if there is, only 1 OFDM symbol; 1 bit indicates the guard interval UGI, a total of 1 OFDM symbol.
  • the method for indicating the downlink transmission channel or the uplink transmission channel resource allocation of the control channel is as follows:
  • Nbit is used to indicate the starting position of a certain STA in the downlink transmission channel, and Nbit is used to indicate how many consecutive STAs are in the position.
  • the length of the resource is 000100000, and the conversion to decimal is 32. After the symbol (including the symbol), 32 consecutive symbols are assigned to the STA.
  • Mbit is used to indicate the starting position of a certain STA in the uplink transmission channel, and Mbit is used to indicate how many bits of the STA are allocated resources after the location.
  • the frame structure and/or the frame length may be jointly indicated by the system information channel and the control channel, as follows: In the system information channel, the control channel period is indicated by 6 bits, the maximum 63 OFDM symbols, or the frame length is also indicated; In the channel, 9 bits indicates the downlink transmission channel period, 9 bits indicates the uplink transmission channel period, 1 bit indicates the downlink protection interval DGI, 2 bits indicates the uplink sounding channel configuration, 2 bits indicates the uplink scheduling request channel configuration, and 1 bit indicates the uplink. Random access channel configuration, with 1 bit indicating the upstream protection interval UGI.
  • all the terminal devices associated with the network device can accurately determine each TDD frame period and the uplink transmission period and the downlink transmission period in the frame by the following two methods.
  • the first method indicating the frame structure through the system information channel; or indicating the frame structure and frame length through the system information channel.
  • the channel period configuration of each part of the TDD frame is broadcast by the system information channel through system information.
  • the system information channel can not only broadcast the basic system information such as the frequency band configuration, the antenna configuration, and the frame number of the network device, but also can broadcast the period or presence of each subchannel or part of the subchannel in the frame, such as Control channel period, uplink and downlink transmission channel period, presence or absence of auxiliary channel, and period.
  • the system information channel When the structure of the current frame is indicated by the system information channel, since the system information channel indicates the presence or absence of the control channel transmission period and part of the auxiliary channel transmission, all terminal devices associated with the network device receive the network device. After each communication frame is sent, the system information channel of the communication frame is first detected, and the control channel transmission period, the uplink and downlink transmission channel transmission period, and other auxiliary channels are present and the transmission period are determined, and the channel periods are summed and calculated. Obtain the transmission resources occupied by each terminal device, and finally determine the structure and frame length of the current frame. When the system information channel indicates the structure and the frame length of the current frame, all the terminal devices associated with the network device first detect the system information channel of the communication frame after receiving each communication frame sent by the network device, and determine the control. The channel period, the downlink transmission channel transmission period, the uplink transmission channel transmission period, and other auxiliary channels are present and transmitted, and the frame length of the current frame is directly obtained.
  • the second method jointly indicates the frame structure through the system information channel and the control channel; or jointly indicates the frame structure and the frame length through the system information channel and the control channel.
  • all terminal devices associated with the network device After receiving each communication frame sent by the network device, first detect the system information channel of the communication frame, and determine the control channel. Transmission period or presence and other auxiliary channel transmission periods. On each control channel of the frame, it is determined that the network device separately schedules uplink and downlink transmission channel resources and each auxiliary channel for each terminal device that needs to be scheduled in the frame (for example, a downlink sounding channel, an uplink sounding channel, an uplink scheduling request channel, and an uplink). Random access channel) resources.
  • Integrating the information transmitted in the system information channel and the control channel summing the channel periods, calculating the transmission resources occupied by each terminal device, and finally determining the structure of the frame, calculating the frame length of the current frame;
  • the control channel jointly indicates the frame structure and the frame length
  • all terminal devices associated with the network device first detect the communication frame after receiving each communication frame sent by the network device.
  • the system information channel of the communication frame determines whether the control channel transmission period or the presence and other auxiliary channel transmission periods are present or not, and directly obtains the frame length of the current frame.
  • On each control channel of the frame it is determined that the network device separately schedules uplink and downlink transport channel resources and each auxiliary channel resource for each terminal device that needs to be scheduled in the current frame.
  • Each terminal device associated with the network device receives the scheduling signaling, determines a transmission period according to the transmission resource, and calculates a frame length of the current frame, or obtains a frame length of the current frame, and determines a transmission period according to the transmission resource, specifically including After receiving the frame structure information and the scheduling signaling, each terminal device associated with the network device detects the system information channel and the control channel, and integrates the system information transmitted in the system information channel and the scheduling signaling transmitted in the control channel.
  • the network device mentioned in the present invention is not limited to the CAP, and may be other network devices such as a base station.
  • the terminal device is not limited to the STA, and may be other terminal devices such as a terminal.
  • FIG. 3 is a schematic flow chart of a scheduling method applicable to downlink scheduling according to Embodiment 2 of the present invention. The following describes the downlink scheduling and transmission process in detail, including the following four steps:
  • Step S301 The network device acquires downlink scheduling information, where the downlink scheduling information includes scheduling requirements of different service flows of each terminal device or each terminal device (for example: service to be scheduled and queue length, quality of service QoS requirements of different services, service) Priority, etc.).
  • the downlink scheduling information includes scheduling requirements of different service flows of each terminal device or each terminal device (for example: service to be scheduled and queue length, quality of service QoS requirements of different services, service) Priority, etc.).
  • the step S301 may further include: acquiring state information or quality information of the downlink transmission channel of the network device to each terminal device (whether the network device can obtain the state information or the quality information of the downlink transmission channel depends on the capability of the terminal device, if the terminal device Not supported, the network device may not rely on the channel information scheduling).
  • the frame period determination is performed by the scheduler on the network device side.
  • the scheduler obtains downlink scheduling information from the MAC or the upper layer of the network device, and obtains status information or quality information of the downlink transport channel by using the following three methods:
  • the first mode the network device schedules N uplink sounding channels for the N terminal devices that need to be scheduled, and each terminal device transmits a sounding signal on the uplink sounding channel, and the network device measures the quality of the uplink transmission channel by using the uplink sounding signal, and is based on the TDD system.
  • the uplink and downlink reciprocity obtains the quality information of the downlink transmission channel corresponding to each terminal device;
  • the second mode the network device schedules N uplink feedback channels for the N terminal devices that need to be scheduled, and each terminal device measures the state or quality of the channel according to the downlink detection or the common pilot signal, and is on the uplink feedback channel scheduled by the network device. Feedback status information or quality information of the channel;
  • the third mode the network device schedules N uplink sounding channels and N uplink feedback channels for the N terminal devices that need to be scheduled, and each terminal device measures the state or quality of the channel according to the downlink sounding or the common pilot signal, and transmits the uplink signal.
  • Each terminal device transmits an uplink sounding signal and feedback state or quality information of all or part of the channel respectively for the uplink sounding channel and the uplink feedback channel scheduled for it.
  • the status information of the channel refers to the downlink transmission channel matrix H (NXM stage, N receiving antennas, M transmitting antennas;), or the V (MXK order) matrix of the downlink transmission channel matrix H after SVD decomposition, or Compressed information of the V matrix;
  • the quality information of the channel refers to the following information or part of information: SNR (Signal to Noise Ratio) or SINR (Signal to Noise Ratio) of the downlink transmission channel, MCS (modulation coding set available for downlink transmission), Nss (downstream) The number of spatial streams that can be used for transmission;), PMI (a set of precoding matrices that can be used for downlink transmission) and other related measurement scales;
  • the measurement and feedback of the state or quality of the channel may be state information or quality information of a channel for measuring and feeding back the entire frequency band, or status information or quality information of a channel for measuring and feeding back a partial frequency band;
  • the uplink sounding channel may be scheduled on demand, and the on-demand scheduling includes two modes: the network device triggers the scheduling STA to transmit the sounding signal, or after the network device schedules once, the terminal device is in the uplink for a period of time.
  • the detection signal is periodically transmitted on the sounding channel;
  • the ACK or NACK feedback for the service of the downlink transmission channel in the frame may be the uplink transmission channel feedback in the current frame, or may be the uplink transmission channel feedback in other frames, or may not be fed back.
  • Step S302 The scheduling device of the network device completes the scheduling algorithm, including: the network device schedules downlink transmission resources for all or part of the terminal equipments with service requirements according to the downlink scheduling information; or the network device combines the status of the channel according to the downlink scheduling information. Or quality information, scheduling downlink transmission resources for all or part of the terminal equipment having service requirements; wherein, the scheduling algorithm is, for example, a maximum load ratio scheduling algorithm, a polling scheduling algorithm, a proportional fair scheduling algorithm, and the like.
  • Each terminal device can share downlink transmission resources by combining time division, frequency division, code division, space division or the above multiplexing manner.
  • the scheduling the downlink transmission resource according to the downlink scheduling information includes: scheduling a downlink transmission channel for the terminal device, or scheduling the downlink transmission channel and the downlink sounding channel for the terminal device.
  • Step S303 The network device calculates the intra-frame downlink scheduling week according to the downlink resources scheduled in the frame. Period (including the preamble sequence period, the system information channel period, the control channel period, and the downlink transmission channel period, and may also include one or more of the downlink sounding channel periods), and combined with the uplink scheduling period (possibly including the uplink sounding channel period, uplink)
  • the scheduling request channel period, the uplink transmission channel period, and one of the uplink random access channel periods and the guard interval determine the structure of the current frame; after determining the structure of the current frame, the method may further include the step of: calculating the frame length of the current frame.
  • the calculation of the intra-frame control channel period according to the downlink resources scheduled in the frame is specifically: calculating the control channel period according to the number of downlink scheduling signaling and the packet size of each signaling.
  • the specific implementation for example: summing the size of each signaling packet to obtain a control channel period, or if the signaling packet is a fixed size, multiplying the fixed size of the signaling packet by the number of signaling, and obtaining control Channel period.
  • the downlink transmission channel period in the current frame is calculated according to the downlink resource scheduled in the frame, and specifically: the downlink transmission channel period is calculated by summing the downlink transmission resources scheduled by each terminal device.
  • Step S304 The network device broadcasts the structure of the current frame, and sends downlink scheduling signaling.
  • the structure of the frame may be broadcast through a system information channel, or a system information channel is combined with a control channel, or other channels;
  • Downlink scheduling signaling may be sent over a control channel or other channel.
  • Step S304 may further include the step of: broadcasting the frame length of the current frame.
  • the system information channel is used, or the system information channel is combined with the control channel, or the other channel broadcasts the structure and/or frame length of the frame.
  • Step S304 may further include the following steps: the network device sends downlink service data and/or control signaling, and specifically includes: transmitting downlink service data and/or control signaling by using a downlink transport channel or other channels.
  • the structure of the communication frame is configured and sent to the terminal device associated with the network device.
  • the terminal device After receiving the downlink scheduling signaling sent by the network device, the terminal device checks the system information channel and the control channel, calculates the transmission resource occupied by each terminal device according to the system information and the downlink scheduling signaling, and determines the downlink transmission period and the uplink transmission period. And calculating the frame length of the frame;
  • step s304 not only broadcasts the structure of the current frame but also broadcasts the frame length, the terminal device directly obtains the frame length of the current frame, and no calculation is required.
  • Figures 4 and 5 show Embodiments 3 and 4 of the downlink scheduling and transmission process.
  • the following takes the network device as the CAP and the terminal device as the STA as an example to describe the downlink scheduling and transmission process in detail.
  • Embodiment 3 In the third embodiment, the following describes the downlink scheduling and transmission process in the case that the CAP measures the quality of the downlink channel through the uplink sounding channel, and specifically includes the following steps:
  • Step S401 The CAP acquires the downlink scheduling information and the quality of the downlink transmission channel, including: CAP is two STAs that need to be scheduled, that is, STA1 and STA2 schedule two uplink sounding channels, and one uplink transmission channel is scheduled for STA1 that needs to be scheduled, STA1 And the STA2 transmits the sounding signal on the uplink sounding channel, and the CAP measures the quality of the uplink transport channel by using the uplink sounding signal, and obtains the quality of the downlink transport channel corresponding to each STA1 and STA2 based on the uplink and downlink reciprocity of the TDD system;
  • Step S402 The CAP measures the channel state and completes the scheduling algorithm, and includes: the CAP schedules the downlink transmission resource according to the downlink scheduling information and the quality of the downlink transmission channel, and the STA1 and the STA2 share the downlink through the time division multiplexing mode. Transmitting the resource;
  • Step S404 The CAP combines the system information channel, or the system information channel with the control channel, broadcasts the structure of the current frame, and sends downlink scheduling signaling through the control channel, and sends downlink service data and/or control signaling through the downlink transmission channel. See Figure 4 for the frame structure obtained by the above steps.
  • FIG. 4 is a schematic diagram of a frame structure of a CAP for measuring a quality of a downlink transmission channel through an uplink sounding channel according to Embodiment 3 of the present invention.
  • the communication frame is divided into a preamble sequence, a system information channel, a control channel, a downlink transmission channel, a DGI, an uplink sounding channel, an uplink scheduling request channel, an uplink transmission channel, an uplink random access channel, and a U G I.
  • Embodiment 4 the process of downlink transmission of the quality scheduling of the CAP through the uplink feedback channel is specifically described, which specifically includes the following steps:
  • Step S501 The CAP acquires the downlink scheduling information and the quality of the downlink transmission channel, including: the CAP is two STAs that need to be scheduled, that is, STA1 and STA2 schedule two uplink transmission channels (for feedback), and STA1 and STA2 are based on downlink detection or public.
  • the pilot signal measures the state or quality of the downlink sounding channel, and feeds back the state or quality of the channel on the uplink transmission channel scheduled by the CAP, that is, CSI feedback;
  • Step S502 The CAP measures the channel state and completes the scheduling algorithm, including: the CAP schedules the downlink transmission resource for the STA1 and the STA2 according to the downlink scheduling information and the CSI feedback, and the STA1 and the STA2 share the downlink transmission resource by using the time division multiplexing manner;
  • the downlink scheduling period the preamble sequence period, the system information channel period, the control channel period, the downlink transmission channel period, and the downlink sounding channel period
  • the scheduling period (uplink transmission channel period, uplink random access channel period, and uplink scheduling request channel period) and the guard interval determine the structure of the current frame, and calculate the frame length of the current frame; step s504: CAP is in the system information channel, or the system information channel In combination with the control channel, the structure and frame length of the current frame are broadcasted, and downlink scheduling signaling is sent through the control channel, and downlink service data and/or control signaling is sent through the downlink transmission channel. See Figure 5 for the frame structure obtained by the above steps.
  • FIG. 5 is a schematic diagram of a frame structure of a quality scheduling downlink transmission of a CAP through an uplink feedback channel according to Embodiment 4 of the present invention.
  • the communication frame is divided into a preamble sequence, a system information channel, a control channel, a downlink transmission channel 1, a downlink sounding channel, a downlink transmission channel 2, a DGI, an uplink scheduling request channel, an uplink transmission channel, and uplink random access.
  • Channel and UGI are examples of channels and UGI.
  • the frame N-1 and the frame N need different downlink services, the frame N-1 and the frame N have different frame lengths.
  • the uplink sounding channel is required to obtain the quality of the downlink transport channel considering the TDD uplink and downlink channel reciprocity.
  • the STA measures the downlink sounding channel and feeds back the quality of the channel to the CAP, so that the uplink sounding channel is no longer needed. Which feedback method is used is determined by the CAP scheduler based on the STA capabilities and system settings.
  • the CAP can determine the frame structure and the frame length of the frame according to the requirements of the uplink and downlink transmission channels in each frame and the presence or absence of each auxiliary or control channel, and broadcast the basic system configuration of the frame together with the control channel through system information or system information. information.
  • the uplink and downlink transmission periods can be adaptively changed with the uplink and downlink service requirements, and the system scheduling period can be adaptively adjusted with the time selective fading of the wireless channel.
  • the uplink and downlink transmission channel periods in the frame, the presence or absence of each auxiliary or control channel, or the period are determined by the scheduler according to the service and signaling scheduling requirements.
  • the downlink transmission service of the STA1 in the Nth frame transmits the ACK1 signaling in the uplink transmission of the frame, and the downlink transmission of the STA2 in the Nth frame does not feed back the ACK2 signaling in the uplink transmission of the frame. This may be due to the following reasons: (1) The downlink transmission of STA2 in the Nth frame is fed back in the N+k frame; (2) The downlink service of STA2 does not need to feed back ACK signaling.
  • FIG. 6 is a schematic flowchart of a scheduling method applicable to uplink scheduling according to Embodiment 5 of the present invention, which describes an uplink scheduling and transmission process, and includes the following four steps:
  • Step s601 The network device acquires uplink scheduling information.
  • the uplink scheduling information includes scheduling requirements of different service flows of each terminal device or each terminal device (for example, service to be scheduled and queue length, quality of service QoS requirements for different services, service priority, and the like);
  • the step S601 may further include: acquiring state information or quality information of an uplink transmission channel of each terminal device to the network device (the network device may also not rely on the channel information scheduling).
  • the frame period determination is performed by the network device side scheduler.
  • the network device can measure the status or quality of the uplink channel through the uplink sounding channel and inform the network device side scheduler.
  • the network device can schedule an uplink sounding channel for the terminal device according to requirements, and can also configure a periodic uplink sounding channel for the terminal device. If the network device is configured with a periodic uplink sounding channel for the terminal device, the network device may schedule the time-frequency resource for the terminal device according to the existing uplink transport channel information.
  • the network device can obtain the uplink scheduling information in the following three manners:
  • the first type obtains the uplink scheduling information by using the request-response mode, where the terminal device initiates the scheduling request, and the network device uses the uplink transmission channel as the terminal.
  • the device allocates resources, and the terminal device feeds back uplink scheduling requirement information in the corresponding resource;
  • the uplink scheduling information is obtained by the polling mode, and the specific information is as follows: The network device periodically polls each terminal device for feedback of the uplink scheduling requirement; and the third type: obtains the uplink scheduling information by using the reporting mode: the terminal device is in the uplink service transmission. Slightly with the remaining upstream scheduling requirements.
  • the terminal device initiates a scheduling request, which has the following two methods:
  • the network device allocates a unique uplink transmission request channel to the terminal device;
  • a contention-based uplink transmission request mechanism that is, the terminal device does not have a designated uplink transmission request channel, and transmits a pop-up request to the network device by competing for the uplink transmission request channel or the random access channel.
  • the frame period is determined by the CAP side scheduler.
  • the CAP can measure the uplink channel status or quality through the uplink detection channel and inform the CAP side scheduler.
  • the CAP can schedule an uplink sounding channel for the STA as needed, and can also configure a periodic uplink sounding channel for the STA. If the CAP is configured with a periodic uplink sounding channel for the STA, the CAP can schedule the time-frequency resource for the STA according to the existing uplink transmission channel information.
  • Step S602 The scheduler of the network device completes the scheduling algorithm, including: the network device allocates uplink transmission resources to all or part of the terminal equipments with service requirements according to the uplink scheduling information, where the scheduling algorithm is, for example, a maximum load ratio scheduling Algorithm, polling scheduling algorithm, proportional fair scheduling algorithm, etc.
  • the scheduling algorithm is, for example, a maximum load ratio scheduling Algorithm, polling scheduling algorithm, proportional fair scheduling algorithm, etc.
  • Each terminal device can share uplink transmission resources by combining time division, frequency division, code division, space division or the above multiplexing manner.
  • the scheduling the uplink transmission resource according to the uplink scheduling information includes: scheduling an uplink transmission channel for the terminal device.
  • Scheduling the uplink transmission resource according to the uplink scheduling information further includes: scheduling uplink detection for the terminal device One or more of the channel, uplink scheduling request channel.
  • Step S603 The network device calculates an uplink scheduling period in the frame according to the uplink resource scheduled in the frame, including one or more of an uplink transmission channel period, an uplink sounding channel period, an uplink scheduling request channel period, and an uplink random access channel period. And determining the structure of the frame in combination with the intra-frame downlink scheduling period (including the preamble sequence period, the system information channel period, the control channel period, and the downlink transmission channel period, and possibly the downlink sounding channel period) and the guard interval;
  • Step S604 The network device broadcasts the structure of the current frame and sends scheduling signaling.
  • the structure of the frame may be broadcast through a system information channel, or a system information channel is combined with a control channel, or other channels;
  • Step S604 may further include the step of: broadcasting the frame length of the current frame.
  • the system information channel is used, or the system information channel is combined with the control channel, or the other channel broadcasts the structure and/or frame length of the frame.
  • the method may further include: Step S605: The terminal device sends the uplink service data and/or the feedback information, and the method includes: sending the uplink service data and/or the feedback information by using the uplink transmission channel.
  • the structure of the communication frame is configured and sent to the terminal device associated with the network device.
  • the terminal device After receiving the uplink scheduling signaling sent by the network device, the terminal device checks the system information channel and the control channel, calculates the transmission resource occupied by each terminal device according to the system information and the uplink scheduling signaling, determines the uplink transmission period, and calculates The frame length of this frame;
  • step s604 not only broadcasts the structure of the current frame but also broadcasts the frame length, the terminal device directly obtains the frame length of the current frame, and no calculation is required.
  • the following takes the network device as the CAP and the terminal device as the STA as an example to describe the uplink scheduling and transmission process in detail.
  • Step S701 The CAP acquires the uplink scheduling information and the uplink transmission channel.
  • the quality includes: triggering a scheduling request by the STA for the exclusive collision-free uplink scheduling request channel allocated by the CAP, and after receiving the scheduling request by the corresponding channel, the CAP may determine which STA initiates the scheduling request; and in the N- 1 frame scheduling the STA to feed back the scheduling information, and scheduling the STA to transmit the uplink sounding signal, so that the CAP can measure the state or quality information of the uplink transport channel; Step s702: The CAP completes the scheduling algorithm, including: obtaining the scheduling information and the state of the uplink transport channel or After the quality information, the CAP schedules the uplink transmission resource for the STA in the Nth frame according to the uplink scheduling information and the quality of the uplink channel.
  • Step S703 The CAP calculates the intra control channel period and the uplink scheduling period according to the uplink scheduling transmission in the frame. Probing channel period, uplink scheduling request channel period, uplink transmission channel Period and an uplink random access channel cycle), and combined with the intra-downlink scheduling period (a preamble sequence period, the system information channel period, determining a control channel structure of the present frame transmission periods and the downlink channel cycle) and a guard interval and the like;
  • Step S704 The CAP combines the system information channel, or the system information channel with the control channel, broadcasts the structure of the current frame, and sends the uplink scheduling signaling by using the control channel.
  • Step S705 The STA sends uplink service data and/or feedback information through an uplink transmission channel. See Figure 7 for the frame structure obtained by the above steps.
  • FIG. 7 is a schematic diagram of a frame structure of an uplink scheduling transmission process when a state/quality information of a CAP unknown uplink channel and a bandwidth requirement are provided according to Embodiment 6 of the present invention.
  • the communication frame is divided into a preamble sequence channel, a system information channel, a control channel, a downlink transmission channel, a downlink guard interval DGI, an uplink sounding channel, an uplink scheduling request channel, an uplink transmission channel, an uplink random access channel, and an uplink. Protection interval UGI.
  • the uplink scheduling and transmission process in the case that the CAP transmits the slightly scheduled information through the uplink service specifically includes the following steps:
  • Step s801 The CAP obtains uplink scheduling information, which specifically includes: the STA slightly carries uplink scheduling information in the process of transmitting the service in the Nth frame;
  • Step S802 After the uplink scheduling information is learned, the scheduling algorithm is completed, and the CAP directly schedules the STA uplink transmission in the N+1th frame.
  • Step S804 The CAP combines the system information channel or the system information channel with the control channel, broadcasts the structure, structure, and frame length of the current frame, and sends uplink scheduling signaling through the control channel.
  • Step s805 The STA sends uplink service and/or feedback information through the uplink transmission channel. See Figure 8 for the frame structure obtained by the above steps.
  • FIG. 8 is a schematic diagram of a frame structure of an uplink scheduling transmission process when a CAP transmits slightly scheduling information through an uplink service according to Embodiment 7 of the present invention. As shown in FIG. 8, the communication frame is divided into a preamble sequence channel, a system information channel, a control channel, a downlink transmission channel, a downlink guard interval DGI, an uplink sounding channel, an uplink scheduling request channel, an uplink transmission channel, an uplink random access channel, and an uplink. Protection interval UGI.
  • an embodiment of the present invention provides a network device, as shown in FIG. 9, including:
  • the obtaining unit 901 is configured to acquire scheduling information
  • the scheduling unit 902 is connected to the acquiring unit 901, and configured to schedule transmission resources according to the scheduling information.
  • a determining unit 903 configured to be connected to the scheduling unit 902, configured to calculate an uplink scheduling period and a downlink scheduling period according to the transmission resource scheduled in the intraframe; and determine a structure of the frame according to an uplink scheduling period, a downlink scheduling period, and a guard interval;
  • the broadcast unit 904 is connected to the determining unit 903 and configured to broadcast the current frame.
  • the sending unit 905 is connected to the scheduling unit 902 for transmitting downlink scheduling signaling.
  • the scheduling information includes scheduling requirements of each receiving device, or scheduling requirements of different service flows of each receiving device; and the scheduling signaling is used to indicate allocation of transmission resources.
  • the foregoing network device may further have the following features: the acquiring unit 901 is configured to acquire downlink scheduling information;
  • the scheduling unit 902 is configured to schedule downlink transmission resources according to the downlink scheduling information.
  • the determining unit 903 is configured to calculate a downlink scheduling period according to the downlink transmission resource scheduled in the intra frame.
  • the foregoing network device may also have the following features:
  • the scheduling unit 902 is configured to schedule a downlink transport channel according to the downlink scheduling information. Further, the foregoing network device may also have the following features:
  • the first computing unit 906 is further connected to the scheduling unit 902, where the scheduling unit 902 is configured to schedule an uplink sounding channel for the STA to send an uplink sounding signal according to the downlink scheduling information; and combine the downlink transport channel. Quality information and/or status information to schedule downlink transmission resources;
  • the first calculating unit 906 is configured to calculate the quality and/or state of the uplink transmission channel by measuring the sounding signal of the uplink sounding channel, and determine the quality and/or state of the downlink transmission channel based on the upper and lower reciprocity of the system.
  • the foregoing network device may also have the following features:
  • the scheduling unit 902 is configured to: according to the downlink scheduling information, schedule a downlink sounding channel used by the CAP to send a downlink sounding signal; and schedule a quality and/or state for the STA to feed back the downlink transport channel measured according to the downlink sounding signal. Uplink transmission channel; and scheduling downlink transmission resources in combination with quality and/or state of downlink transmission channel acquired through feedback.
  • the foregoing network device may further have the following features: the acquiring unit 901 is configured to acquire uplink scheduling information;
  • the scheduling unit 902 is configured to schedule an uplink transmission resource according to the uplink scheduling information
  • the determining unit 903 is configured to calculate an uplink scheduling period according to the uplink transmission resource scheduled in the intra frame.
  • the foregoing network device may also have the following features:
  • the scheduling unit 902 is configured to schedule an uplink transport channel according to the uplink scheduling information. Further, the foregoing network device may also have the following features:
  • the second computing unit 907 is further configured to be connected to the scheduling unit 902, where: the scheduling unit 902 is configured to schedule, according to the uplink scheduling information, an uplink sounding channel used by the STA to send an uplink sounding signal; Scheduling uplink transmission resources by quality information and/or status information of the transmission channel;
  • the second calculating unit 907 is configured to measure the quality and/or state of the uplink transmission channel by measuring the sounding signal of the uplink sounding channel. Further, the foregoing network device may also have the following features:
  • the scheduling unit 902 is configured to: according to the uplink scheduling information, schedule a downlink sounding channel used by the CAP to send a downlink sounding signal; and schedule the STA to feed back the quality and/or state of the downlink transport channel measured according to the downlink sounding signal.
  • the uplink transmission channel and after obtaining the quality and/or state of the downlink transmission channel by feedback, determining the quality and/or state of the uplink transmission channel based on the upper and lower reciprocity of the system, combining the quality of the uplink transmission channel and/or Or state, scheduling uplink transmission resources.
  • the scheduling unit 902 is configured to schedule a system information channel and a control channel;
  • the broadcast unit 904 is configured to broadcast the structure of the current frame by using a system information channel; or, jointly broadcast the structure of the current frame by using the system information channel and the control channel;
  • the sending unit 905 is configured to send the scheduling signaling by using a control channel.
  • the embodiment of the present invention provides a terminal device, as shown in FIG. 10, including:
  • the receiving unit 1001 is configured to receive structural information and scheduling signaling of the current frame.
  • the determining unit 1002 is connected to the receiving unit 1001, configured to determine the structure of the current frame according to the structural information of the current frame, and determine the allocation of the resource according to the scheduling signaling.
  • the foregoing terminal device may further have the following features:
  • the processing unit 1003 is connected to the determining unit 1002, and is configured to parse the current frame according to the structure and resource allocation of the current frame, and perform data transmission and reception processing on the corresponding channel.
  • FIG. 11 is a schematic diagram of a system frame structure of an uplink and downlink scheduling transmission process provided by an application example.
  • the frame is divided into a preamble sequence, a system information channel, a control channel, a downlink service transmission channel, a downlink guard interval DGI, an uplink sounding channel, an uplink scheduling request channel, an uplink traffic transmission channel, an uplink random access channel, and an uplink. Protection interval UGI.
  • the preamble sequence specifically includes a short preamble and a long preamble.
  • a CAP is associated with 4 STAs: STA0, STA1, STA2, and STA3.
  • STAO performs uplink and downlink service transmission, but there are still packet queuing in the downlink transmission queue of each service of STA0, waiting to be scheduled.
  • STA0 is slightly up after the end of N-1 frame.
  • the STA0 service uplink queue waits for the number of scheduled packets.
  • the STA schedules STA0 to feed back the quality of the downlink channel through the uplink transmission channel in the N-1th frame; to ensure efficient uplink scheduling of the Nth frame, the CAP schedules STA0 in the Nth frame to be in the uplink sounding channel.
  • the uplink detection signal is transmitted on the 1 to facilitate the CAP to measure the quality of the uplink channel.
  • STA1 has a new downlink service arriving, waiting to be scheduled.
  • STA2 completes the random access procedure in the N-1 frame, waits to be scheduled, and reports the transmission capability and device configuration of STA2 to the CAP.
  • STA3 successfully initiates an uplink scheduling request on the N-1 frame uplink scheduling request channel.
  • the CAP schedules downlink 384 OFDM symbols for downlink service transmission for STA0 according to the STA0 downlink transmission queue information and the quality of the downlink transmission channel fed back in the N-1 frame. Since only STA0 has service transmission, the downlink transmission channel in this frame is allocated 384 OFDM symbols, and the OFDM symbols numbered 1 to 384 are transmitted by the CAP to STA0.
  • the CAP sends a downlink sounding signal, and schedules STA1 to feed back the state information of the channel in the uplink transmission process. Therefore, the intra-frame downlink sounding channel is set to 1 OFDM symbol.
  • the CAP schedules the uplink 128 OFDM symbols for the uplink service transmission for the STA0 according to the uplink transmission queue information fed back by the STA0 and the quality of the uplink transmission channel measured by the CAP according to the uplink sounding channel 1.
  • the CAP allocates 16 OFDM symbols for STA2 to report STA2 transmission capability and device configuration.
  • the CAP allocates 16 OFDM symbols to STA3 and reports the uplink scheduling channel.
  • Both STA2 and STA3 are feedback transmissions, and the determined modulation and coding format is used.
  • the CAP does not need to consider the quality of the uplink transmission channel as its assigned transmission format.
  • the CAP estimates that STA0 still has uplink traffic waiting for transmission, so the scheduling STA0 still transmits the uplink sounding channel through the uplink sounding channel 1.
  • the CAP scheduling STA3 transmits an uplink sounding channel on the uplink sounding channel 2, which facilitates scheduling STA3 uplink transmission in the N+1 frame.
  • the CAP allocates the quality of the 64 OFDM symbol feedback uplink channels to STA1.
  • the CAP calculates the control channel requirements: downlink scheduling transmission, and feedback ACK/NACK signaling for N-1 frame STA0 uplink transmission, which requires 2 control subchannels; uplink scheduling transmission requires 6 control subchannels for STA0, STA1, STA2 and STA3 uplink transmission channel scheduling, and STA0 and STA3 uplink sounding channel assignment.
  • this frame requires 6 OFDM symbols for control channel transmission.
  • the Nth frame configuration information is as follows: 6 OFDM symbols are used for control channel transmission, 384 OFDM symbols are used for downlink traffic transmission, and 1 OFDM symbol is used for downlink sounding channel transmission (downlink sounding channel position is fixed) 2 OFDM symbols are used for uplink sounding channel transmission, 2 OFDM symbols are used for uplink scheduling request channel, and 224 OFDM symbols are used.
  • 1 OFDM symbol is used for the uplink random access channel.
  • one OFDM symbol is used for the uplink guard interval DGI, and uplink to downlink guard interval UGI each OFDM symbol.
  • the STA0, STA 1, STA 2, and STA 3 can obtain the control channel period by 6 OFDM symbols, the downlink transmission channel period by 384 OFDM symbols, and the DGI period by receiving the broadcast information of the system information channel.
  • the method, the system and the device of the present invention can dynamically adapt to the future rich and diverse data.
  • the system can provide very small resource granularity, which can not only adapt to the large service rate change of different terminals, but also better adapt to the dynamic changes of the wireless channel. 4
  • the system can weigh the business requirements and channel characteristics, dynamically divide the uplink and downlink resources, and dynamically allocate radio resources for different terminals under the condition of link adaptation.

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Abstract

La présente invention concerne un procédé de programmation, un dispositif réseau et un dispositif terminal. Le procédé consiste à acquérir des informations de programmation; à programmer une ressource de transmission d'après les informations de programmation; à calculer une période de programmation en liaison ascendante et une période de programmation en liaison descendante en fonction d'une ressource de transmission programmée dans une trame en cours; à déterminer une structure de la trame en cours en fonction de la période de programmation en liaison ascendante, de la période de programmation en liaison descendante et d'un intervalle de garde; puis à radiodiffuser la structure de la trame en cours et à envoyer une signalisation de la programmation. Grâce au mode de réalisation de la présente invention, différentes caractéristiques de service et différentes exigences sont prises en compte pour divers services de données dans le futur, et une structure de trame ayant une configuration de ressource dynamique souple et répondant à la fois à l'adaptation de liaison et à l'adaptation aux exigences de service peut être conçue. En outre, la structure de la trame est dynamiquement configurée de manière à répondre aux exigences des dispositifs ayant différentes capacités de traitement pendant la durée du traitement.
PCT/CN2012/072784 2011-03-25 2012-03-22 Système de programmation, dispositif réseau, et dispositif terminal Ceased WO2012130076A1 (fr)

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